diff options
Diffstat (limited to 'gcc-4.8.1/gcc/ada/gcc-interface/decl.c')
| -rw-r--r-- | gcc-4.8.1/gcc/ada/gcc-interface/decl.c | 8745 |
1 files changed, 0 insertions, 8745 deletions
diff --git a/gcc-4.8.1/gcc/ada/gcc-interface/decl.c b/gcc-4.8.1/gcc/ada/gcc-interface/decl.c deleted file mode 100644 index 1ccef0ae9..000000000 --- a/gcc-4.8.1/gcc/ada/gcc-interface/decl.c +++ /dev/null @@ -1,8745 +0,0 @@ -/**************************************************************************** - * * - * GNAT COMPILER COMPONENTS * - * * - * D E C L * - * * - * C Implementation File * - * * - * Copyright (C) 1992-2013, Free Software Foundation, Inc. * - * * - * GNAT is free software; you can redistribute it and/or modify it under * - * terms of the GNU General Public License as published by the Free Soft- * - * ware Foundation; either version 3, or (at your option) any later ver- * - * sion. GNAT is distributed in the hope that it will be useful, but WITH- * - * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * - * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * - * for more details. You should have received a copy of the GNU General * - * Public License along with GCC; see the file COPYING3. If not see * - * <http://www.gnu.org/licenses/>. * - * * - * GNAT was originally developed by the GNAT team at New York University. * - * Extensive contributions were provided by Ada Core Technologies Inc. * - * * - ****************************************************************************/ - -#include "config.h" -#include "system.h" -#include "coretypes.h" -#include "tm.h" -#include "tree.h" -#include "flags.h" -#include "toplev.h" -#include "ggc.h" -#include "target.h" -#include "tree-inline.h" -#include "diagnostic-core.h" - -#include "ada.h" -#include "types.h" -#include "atree.h" -#include "elists.h" -#include "namet.h" -#include "nlists.h" -#include "repinfo.h" -#include "snames.h" -#include "stringt.h" -#include "uintp.h" -#include "fe.h" -#include "sinfo.h" -#include "einfo.h" -#include "ada-tree.h" -#include "gigi.h" - -/* "stdcall" and "thiscall" conventions should be processed in a specific way - on 32-bit x86/Windows only. The macros below are helpers to avoid having - to check for a Windows specific attribute throughout this unit. */ - -#if TARGET_DLLIMPORT_DECL_ATTRIBUTES -#ifdef TARGET_64BIT -#define Has_Stdcall_Convention(E) \ - (!TARGET_64BIT && Convention (E) == Convention_Stdcall) -#define Has_Thiscall_Convention(E) \ - (!TARGET_64BIT && is_cplusplus_method (E)) -#else -#define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall) -#define Has_Thiscall_Convention(E) (is_cplusplus_method (E)) -#endif -#else -#define Has_Stdcall_Convention(E) 0 -#define Has_Thiscall_Convention(E) 0 -#endif - -/* Stack realignment is necessary for functions with foreign conventions when - the ABI doesn't mandate as much as what the compiler assumes - that is, up - to PREFERRED_STACK_BOUNDARY. - - Such realignment can be requested with a dedicated function type attribute - on the targets that support it. We define FOREIGN_FORCE_REALIGN_STACK to - characterize the situations where the attribute should be set. We rely on - compiler configuration settings for 'main' to decide. */ - -#ifdef MAIN_STACK_BOUNDARY -#define FOREIGN_FORCE_REALIGN_STACK \ - (MAIN_STACK_BOUNDARY < PREFERRED_STACK_BOUNDARY) -#else -#define FOREIGN_FORCE_REALIGN_STACK 0 -#endif - -struct incomplete -{ - struct incomplete *next; - tree old_type; - Entity_Id full_type; -}; - -/* These variables are used to defer recursively expanding incomplete types - while we are processing an array, a record or a subprogram type. */ -static int defer_incomplete_level = 0; -static struct incomplete *defer_incomplete_list; - -/* This variable is used to delay expanding From_With_Type types until the - end of the spec. */ -static struct incomplete *defer_limited_with; - -typedef struct subst_pair_d { - tree discriminant; - tree replacement; -} subst_pair; - - -typedef struct variant_desc_d { - /* The type of the variant. */ - tree type; - - /* The associated field. */ - tree field; - - /* The value of the qualifier. */ - tree qual; - - /* The type of the variant after transformation. */ - tree new_type; -} variant_desc; - - -/* A hash table used to cache the result of annotate_value. */ -static GTY ((if_marked ("tree_int_map_marked_p"), - param_is (struct tree_int_map))) htab_t annotate_value_cache; - -static bool allocatable_size_p (tree, bool); -static void prepend_one_attribute_to (struct attrib **, - enum attr_type, tree, tree, Node_Id); -static void prepend_attributes (Entity_Id, struct attrib **); -static tree elaborate_expression (Node_Id, Entity_Id, tree, bool, bool, bool); -static bool type_has_variable_size (tree); -static tree elaborate_expression_1 (tree, Entity_Id, tree, bool, bool); -static tree elaborate_expression_2 (tree, Entity_Id, tree, bool, bool, - unsigned int); -static tree gnat_to_gnu_component_type (Entity_Id, bool, bool); -static tree gnat_to_gnu_param (Entity_Id, Mechanism_Type, Entity_Id, bool, - bool *); -static tree gnat_to_gnu_field (Entity_Id, tree, int, bool, bool); -static bool same_discriminant_p (Entity_Id, Entity_Id); -static bool array_type_has_nonaliased_component (tree, Entity_Id); -static bool compile_time_known_address_p (Node_Id); -static bool cannot_be_superflat_p (Node_Id); -static bool constructor_address_p (tree); -static void components_to_record (tree, Node_Id, tree, int, bool, bool, bool, - bool, bool, bool, bool, bool, tree, tree *); -static Uint annotate_value (tree); -static void annotate_rep (Entity_Id, tree); -static tree build_position_list (tree, bool, tree, tree, unsigned int, tree); -static vec<subst_pair> build_subst_list (Entity_Id, Entity_Id, bool); -static vec<variant_desc> build_variant_list (tree, - vec<subst_pair> , - vec<variant_desc> ); -static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool); -static void set_rm_size (Uint, tree, Entity_Id); -static unsigned int validate_alignment (Uint, Entity_Id, unsigned int); -static void check_ok_for_atomic (tree, Entity_Id, bool); -static tree create_field_decl_from (tree, tree, tree, tree, tree, - vec<subst_pair> ); -static tree create_rep_part (tree, tree, tree); -static tree get_rep_part (tree); -static tree create_variant_part_from (tree, vec<variant_desc> , tree, - tree, vec<subst_pair> ); -static void copy_and_substitute_in_size (tree, tree, vec<subst_pair> ); - -/* The relevant constituents of a subprogram binding to a GCC builtin. Used - to pass around calls performing profile compatibility checks. */ - -typedef struct { - Entity_Id gnat_entity; /* The Ada subprogram entity. */ - tree ada_fntype; /* The corresponding GCC type node. */ - tree btin_fntype; /* The GCC builtin function type node. */ -} intrin_binding_t; - -static bool intrin_profiles_compatible_p (intrin_binding_t *); - -/* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada - entity, return the equivalent GCC tree for that entity (a ..._DECL node) - and associate the ..._DECL node with the input GNAT defining identifier. - - If GNAT_ENTITY is a variable or a constant declaration, GNU_EXPR gives its - initial value (in GCC tree form). This is optional for a variable. For - a renamed entity, GNU_EXPR gives the object being renamed. - - DEFINITION is nonzero if this call is intended for a definition. This is - used for separate compilation where it is necessary to know whether an - external declaration or a definition must be created if the GCC equivalent - was not created previously. The value of 1 is normally used for a nonzero - DEFINITION, but a value of 2 is used in special circumstances, defined in - the code. */ - -tree -gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, int definition) -{ - /* Contains the kind of the input GNAT node. */ - const Entity_Kind kind = Ekind (gnat_entity); - /* True if this is a type. */ - const bool is_type = IN (kind, Type_Kind); - /* True if debug info is requested for this entity. */ - const bool debug_info_p = Needs_Debug_Info (gnat_entity); - /* True if this entity is to be considered as imported. */ - const bool imported_p - = (Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity))); - /* For a type, contains the equivalent GNAT node to be used in gigi. */ - Entity_Id gnat_equiv_type = Empty; - /* Temporary used to walk the GNAT tree. */ - Entity_Id gnat_temp; - /* Contains the GCC DECL node which is equivalent to the input GNAT node. - This node will be associated with the GNAT node by calling at the end - of the `switch' statement. */ - tree gnu_decl = NULL_TREE; - /* Contains the GCC type to be used for the GCC node. */ - tree gnu_type = NULL_TREE; - /* Contains the GCC size tree to be used for the GCC node. */ - tree gnu_size = NULL_TREE; - /* Contains the GCC name to be used for the GCC node. */ - tree gnu_entity_name; - /* True if we have already saved gnu_decl as a GNAT association. */ - bool saved = false; - /* True if we incremented defer_incomplete_level. */ - bool this_deferred = false; - /* True if we incremented force_global. */ - bool this_global = false; - /* True if we should check to see if elaborated during processing. */ - bool maybe_present = false; - /* True if we made GNU_DECL and its type here. */ - bool this_made_decl = false; - /* Size and alignment of the GCC node, if meaningful. */ - unsigned int esize = 0, align = 0; - /* Contains the list of attributes directly attached to the entity. */ - struct attrib *attr_list = NULL; - - /* Since a use of an Itype is a definition, process it as such if it - is not in a with'ed unit. */ - if (!definition - && is_type - && Is_Itype (gnat_entity) - && !present_gnu_tree (gnat_entity) - && In_Extended_Main_Code_Unit (gnat_entity)) - { - /* Ensure that we are in a subprogram mentioned in the Scope chain of - this entity, our current scope is global, or we encountered a task - or entry (where we can't currently accurately check scoping). */ - if (!current_function_decl - || DECL_ELABORATION_PROC_P (current_function_decl)) - { - process_type (gnat_entity); - return get_gnu_tree (gnat_entity); - } - - for (gnat_temp = Scope (gnat_entity); - Present (gnat_temp); - gnat_temp = Scope (gnat_temp)) - { - if (Is_Type (gnat_temp)) - gnat_temp = Underlying_Type (gnat_temp); - - if (Ekind (gnat_temp) == E_Subprogram_Body) - gnat_temp - = Corresponding_Spec (Parent (Declaration_Node (gnat_temp))); - - if (IN (Ekind (gnat_temp), Subprogram_Kind) - && Present (Protected_Body_Subprogram (gnat_temp))) - gnat_temp = Protected_Body_Subprogram (gnat_temp); - - if (Ekind (gnat_temp) == E_Entry - || Ekind (gnat_temp) == E_Entry_Family - || Ekind (gnat_temp) == E_Task_Type - || (IN (Ekind (gnat_temp), Subprogram_Kind) - && present_gnu_tree (gnat_temp) - && (current_function_decl - == gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0)))) - { - process_type (gnat_entity); - return get_gnu_tree (gnat_entity); - } - } - - /* This abort means the Itype has an incorrect scope, i.e. that its - scope does not correspond to the subprogram it is declared in. */ - gcc_unreachable (); - } - - /* If we've already processed this entity, return what we got last time. - If we are defining the node, we should not have already processed it. - In that case, we will abort below when we try to save a new GCC tree - for this object. We also need to handle the case of getting a dummy - type when a Full_View exists. */ - if ((!definition || (is_type && imported_p)) - && present_gnu_tree (gnat_entity)) - { - gnu_decl = get_gnu_tree (gnat_entity); - - if (TREE_CODE (gnu_decl) == TYPE_DECL - && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl)) - && IN (kind, Incomplete_Or_Private_Kind) - && Present (Full_View (gnat_entity))) - { - gnu_decl - = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 0); - save_gnu_tree (gnat_entity, NULL_TREE, false); - save_gnu_tree (gnat_entity, gnu_decl, false); - } - - return gnu_decl; - } - - /* If this is a numeric or enumeral type, or an access type, a nonzero - Esize must be specified unless it was specified by the programmer. */ - gcc_assert (!Unknown_Esize (gnat_entity) - || Has_Size_Clause (gnat_entity) - || (!IN (kind, Numeric_Kind) - && !IN (kind, Enumeration_Kind) - && (!IN (kind, Access_Kind) - || kind == E_Access_Protected_Subprogram_Type - || kind == E_Anonymous_Access_Protected_Subprogram_Type - || kind == E_Access_Subtype))); - - /* The RM size must be specified for all discrete and fixed-point types. */ - gcc_assert (!(IN (kind, Discrete_Or_Fixed_Point_Kind) - && Unknown_RM_Size (gnat_entity))); - - /* If we get here, it means we have not yet done anything with this entity. - If we are not defining it, it must be a type or an entity that is defined - elsewhere or externally, otherwise we should have defined it already. */ - gcc_assert (definition - || type_annotate_only - || is_type - || kind == E_Discriminant - || kind == E_Component - || kind == E_Label - || (kind == E_Constant && Present (Full_View (gnat_entity))) - || Is_Public (gnat_entity)); - - /* Get the name of the entity and set up the line number and filename of - the original definition for use in any decl we make. */ - gnu_entity_name = get_entity_name (gnat_entity); - Sloc_to_locus (Sloc (gnat_entity), &input_location); - - /* For cases when we are not defining (i.e., we are referencing from - another compilation unit) public entities, show we are at global level - for the purpose of computing scopes. Don't do this for components or - discriminants since the relevant test is whether or not the record is - being defined. */ - if (!definition - && kind != E_Component - && kind != E_Discriminant - && Is_Public (gnat_entity) - && !Is_Statically_Allocated (gnat_entity)) - force_global++, this_global = true; - - /* Handle any attributes directly attached to the entity. */ - if (Has_Gigi_Rep_Item (gnat_entity)) - prepend_attributes (gnat_entity, &attr_list); - - /* Do some common processing for types. */ - if (is_type) - { - /* Compute the equivalent type to be used in gigi. */ - gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity); - - /* Machine_Attributes on types are expected to be propagated to - subtypes. The corresponding Gigi_Rep_Items are only attached - to the first subtype though, so we handle the propagation here. */ - if (Base_Type (gnat_entity) != gnat_entity - && !Is_First_Subtype (gnat_entity) - && Has_Gigi_Rep_Item (First_Subtype (Base_Type (gnat_entity)))) - prepend_attributes (First_Subtype (Base_Type (gnat_entity)), - &attr_list); - - /* Compute a default value for the size of an elementary type. */ - if (Known_Esize (gnat_entity) && Is_Elementary_Type (gnat_entity)) - { - unsigned int max_esize; - - gcc_assert (UI_Is_In_Int_Range (Esize (gnat_entity))); - esize = UI_To_Int (Esize (gnat_entity)); - - if (IN (kind, Float_Kind)) - max_esize = fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE); - else if (IN (kind, Access_Kind)) - max_esize = POINTER_SIZE * 2; - else - max_esize = LONG_LONG_TYPE_SIZE; - - if (esize > max_esize) - esize = max_esize; - } - } - - switch (kind) - { - case E_Constant: - /* If this is a use of a deferred constant without address clause, - get its full definition. */ - if (!definition - && No (Address_Clause (gnat_entity)) - && Present (Full_View (gnat_entity))) - { - gnu_decl - = gnat_to_gnu_entity (Full_View (gnat_entity), gnu_expr, 0); - saved = true; - break; - } - - /* If we have an external constant that we are not defining, get the - expression that is was defined to represent. We may throw it away - later if it is not a constant. But do not retrieve the expression - if it is an allocator because the designated type might be dummy - at this point. */ - if (!definition - && !No_Initialization (Declaration_Node (gnat_entity)) - && Present (Expression (Declaration_Node (gnat_entity))) - && Nkind (Expression (Declaration_Node (gnat_entity))) - != N_Allocator) - { - bool went_into_elab_proc = false; - int save_force_global = force_global; - - /* The expression may contain N_Expression_With_Actions nodes and - thus object declarations from other units. In this case, even - though the expression will eventually be discarded since not a - constant, the declarations would be stuck either in the global - varpool or in the current scope. Therefore we force the local - context and create a fake scope that we'll zap at the end. */ - if (!current_function_decl) - { - current_function_decl = get_elaboration_procedure (); - went_into_elab_proc = true; - } - force_global = 0; - gnat_pushlevel (); - - gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity))); - - gnat_zaplevel (); - force_global = save_force_global; - if (went_into_elab_proc) - current_function_decl = NULL_TREE; - } - - /* Ignore deferred constant definitions without address clause since - they are processed fully in the front-end. If No_Initialization - is set, this is not a deferred constant but a constant whose value - is built manually. And constants that are renamings are handled - like variables. */ - if (definition - && !gnu_expr - && No (Address_Clause (gnat_entity)) - && !No_Initialization (Declaration_Node (gnat_entity)) - && No (Renamed_Object (gnat_entity))) - { - gnu_decl = error_mark_node; - saved = true; - break; - } - - /* Ignore constant definitions already marked with the error node. See - the N_Object_Declaration case of gnat_to_gnu for the rationale. */ - if (definition - && gnu_expr - && present_gnu_tree (gnat_entity) - && get_gnu_tree (gnat_entity) == error_mark_node) - { - maybe_present = true; - break; - } - - goto object; - - case E_Exception: - /* We used to special case VMS exceptions here to directly map them to - their associated condition code. Since this code had to be masked - dynamically to strip off the severity bits, this caused trouble in - the GCC/ZCX case because the "type" pointers we store in the tables - have to be static. We now don't special case here anymore, and let - the regular processing take place, which leaves us with a regular - exception data object for VMS exceptions too. The condition code - mapping is taken care of by the front end and the bitmasking by the - run-time library. */ - goto object; - - case E_Discriminant: - case E_Component: - { - /* The GNAT record where the component was defined. */ - Entity_Id gnat_record = Underlying_Type (Scope (gnat_entity)); - - /* If the variable is an inherited record component (in the case of - extended record types), just return the inherited entity, which - must be a FIELD_DECL. Likewise for discriminants. - For discriminants of untagged records which have explicit - stored discriminants, return the entity for the corresponding - stored discriminant. Also use Original_Record_Component - if the record has a private extension. */ - if (Present (Original_Record_Component (gnat_entity)) - && Original_Record_Component (gnat_entity) != gnat_entity) - { - gnu_decl - = gnat_to_gnu_entity (Original_Record_Component (gnat_entity), - gnu_expr, definition); - saved = true; - break; - } - - /* If the enclosing record has explicit stored discriminants, - then it is an untagged record. If the Corresponding_Discriminant - is not empty then this must be a renamed discriminant and its - Original_Record_Component must point to the corresponding explicit - stored discriminant (i.e. we should have taken the previous - branch). */ - else if (Present (Corresponding_Discriminant (gnat_entity)) - && Is_Tagged_Type (gnat_record)) - { - /* A tagged record has no explicit stored discriminants. */ - gcc_assert (First_Discriminant (gnat_record) - == First_Stored_Discriminant (gnat_record)); - gnu_decl - = gnat_to_gnu_entity (Corresponding_Discriminant (gnat_entity), - gnu_expr, definition); - saved = true; - break; - } - - else if (Present (CR_Discriminant (gnat_entity)) - && type_annotate_only) - { - gnu_decl = gnat_to_gnu_entity (CR_Discriminant (gnat_entity), - gnu_expr, definition); - saved = true; - break; - } - - /* If the enclosing record has explicit stored discriminants, then - it is an untagged record. If the Corresponding_Discriminant - is not empty then this must be a renamed discriminant and its - Original_Record_Component must point to the corresponding explicit - stored discriminant (i.e. we should have taken the first - branch). */ - else if (Present (Corresponding_Discriminant (gnat_entity)) - && (First_Discriminant (gnat_record) - != First_Stored_Discriminant (gnat_record))) - gcc_unreachable (); - - /* Otherwise, if we are not defining this and we have no GCC type - for the containing record, make one for it. Then we should - have made our own equivalent. */ - else if (!definition && !present_gnu_tree (gnat_record)) - { - /* ??? If this is in a record whose scope is a protected - type and we have an Original_Record_Component, use it. - This is a workaround for major problems in protected type - handling. */ - Entity_Id Scop = Scope (Scope (gnat_entity)); - if ((Is_Protected_Type (Scop) - || (Is_Private_Type (Scop) - && Present (Full_View (Scop)) - && Is_Protected_Type (Full_View (Scop)))) - && Present (Original_Record_Component (gnat_entity))) - { - gnu_decl - = gnat_to_gnu_entity (Original_Record_Component - (gnat_entity), - gnu_expr, 0); - saved = true; - break; - } - - gnat_to_gnu_entity (Scope (gnat_entity), NULL_TREE, 0); - gnu_decl = get_gnu_tree (gnat_entity); - saved = true; - break; - } - - else - /* Here we have no GCC type and this is a reference rather than a - definition. This should never happen. Most likely the cause is - reference before declaration in the gnat tree for gnat_entity. */ - gcc_unreachable (); - } - - case E_Loop_Parameter: - case E_Out_Parameter: - case E_Variable: - - /* Simple variables, loop variables, Out parameters and exceptions. */ - object: - { - bool const_flag - = ((kind == E_Constant || kind == E_Variable) - && Is_True_Constant (gnat_entity) - && !Treat_As_Volatile (gnat_entity) - && (((Nkind (Declaration_Node (gnat_entity)) - == N_Object_Declaration) - && Present (Expression (Declaration_Node (gnat_entity)))) - || Present (Renamed_Object (gnat_entity)) - || imported_p)); - bool inner_const_flag = const_flag; - bool static_p = Is_Statically_Allocated (gnat_entity); - bool mutable_p = false; - bool used_by_ref = false; - tree gnu_ext_name = NULL_TREE; - tree renamed_obj = NULL_TREE; - tree gnu_object_size; - - if (Present (Renamed_Object (gnat_entity)) && !definition) - { - if (kind == E_Exception) - gnu_expr = gnat_to_gnu_entity (Renamed_Entity (gnat_entity), - NULL_TREE, 0); - else - gnu_expr = gnat_to_gnu (Renamed_Object (gnat_entity)); - } - - /* Get the type after elaborating the renamed object. */ - gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); - - /* If this is a standard exception definition, then use the standard - exception type. This is necessary to make sure that imported and - exported views of exceptions are properly merged in LTO mode. */ - if (TREE_CODE (TYPE_NAME (gnu_type)) == TYPE_DECL - && DECL_NAME (TYPE_NAME (gnu_type)) == exception_data_name_id) - gnu_type = except_type_node; - - /* For a debug renaming declaration, build a debug-only entity. */ - if (Present (Debug_Renaming_Link (gnat_entity))) - { - /* Force a non-null value to make sure the symbol is retained. */ - tree value = build1 (INDIRECT_REF, gnu_type, - build1 (NOP_EXPR, - build_pointer_type (gnu_type), - integer_minus_one_node)); - gnu_decl = build_decl (input_location, - VAR_DECL, gnu_entity_name, gnu_type); - SET_DECL_VALUE_EXPR (gnu_decl, value); - DECL_HAS_VALUE_EXPR_P (gnu_decl) = 1; - gnat_pushdecl (gnu_decl, gnat_entity); - break; - } - - /* If this is a loop variable, its type should be the base type. - This is because the code for processing a loop determines whether - a normal loop end test can be done by comparing the bounds of the - loop against those of the base type, which is presumed to be the - size used for computation. But this is not correct when the size - of the subtype is smaller than the type. */ - if (kind == E_Loop_Parameter) - gnu_type = get_base_type (gnu_type); - - /* Reject non-renamed objects whose type is an unconstrained array or - any object whose type is a dummy type or void. */ - if ((TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE - && No (Renamed_Object (gnat_entity))) - || TYPE_IS_DUMMY_P (gnu_type) - || TREE_CODE (gnu_type) == VOID_TYPE) - { - gcc_assert (type_annotate_only); - if (this_global) - force_global--; - return error_mark_node; - } - - /* If an alignment is specified, use it if valid. Note that exceptions - are objects but don't have an alignment. We must do this before we - validate the size, since the alignment can affect the size. */ - if (kind != E_Exception && Known_Alignment (gnat_entity)) - { - gcc_assert (Present (Alignment (gnat_entity))); - - align = validate_alignment (Alignment (gnat_entity), gnat_entity, - TYPE_ALIGN (gnu_type)); - - /* No point in changing the type if there is an address clause - as the final type of the object will be a reference type. */ - if (Present (Address_Clause (gnat_entity))) - align = 0; - else - { - tree orig_type = gnu_type; - - gnu_type - = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity, - false, false, definition, true); - - /* If a padding record was made, declare it now since it will - never be declared otherwise. This is necessary to ensure - that its subtrees are properly marked. */ - if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type))) - create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL, true, - debug_info_p, gnat_entity); - } - } - - /* If we are defining the object, see if it has a Size and validate it - if so. If we are not defining the object and a Size clause applies, - simply retrieve the value. We don't want to ignore the clause and - it is expected to have been validated already. Then get the new - type, if any. */ - if (definition) - gnu_size = validate_size (Esize (gnat_entity), gnu_type, - gnat_entity, VAR_DECL, false, - Has_Size_Clause (gnat_entity)); - else if (Has_Size_Clause (gnat_entity)) - gnu_size = UI_To_gnu (Esize (gnat_entity), bitsizetype); - - if (gnu_size) - { - gnu_type - = make_type_from_size (gnu_type, gnu_size, - Has_Biased_Representation (gnat_entity)); - - if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0)) - gnu_size = NULL_TREE; - } - - /* If this object has self-referential size, it must be a record with - a default discriminant. We are supposed to allocate an object of - the maximum size in this case, unless it is a constant with an - initializing expression, in which case we can get the size from - that. Note that the resulting size may still be a variable, so - this may end up with an indirect allocation. */ - if (No (Renamed_Object (gnat_entity)) - && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) - { - if (gnu_expr && kind == E_Constant) - { - tree size = TYPE_SIZE (TREE_TYPE (gnu_expr)); - if (CONTAINS_PLACEHOLDER_P (size)) - { - /* If the initializing expression is itself a constant, - despite having a nominal type with self-referential - size, we can get the size directly from it. */ - if (TREE_CODE (gnu_expr) == COMPONENT_REF - && TYPE_IS_PADDING_P - (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))) - && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == VAR_DECL - && (TREE_READONLY (TREE_OPERAND (gnu_expr, 0)) - || DECL_READONLY_ONCE_ELAB - (TREE_OPERAND (gnu_expr, 0)))) - gnu_size = DECL_SIZE (TREE_OPERAND (gnu_expr, 0)); - else - gnu_size - = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, gnu_expr); - } - else - gnu_size = size; - } - /* We may have no GNU_EXPR because No_Initialization is - set even though there's an Expression. */ - else if (kind == E_Constant - && (Nkind (Declaration_Node (gnat_entity)) - == N_Object_Declaration) - && Present (Expression (Declaration_Node (gnat_entity)))) - gnu_size - = TYPE_SIZE (gnat_to_gnu_type - (Etype - (Expression (Declaration_Node (gnat_entity))))); - else - { - gnu_size = max_size (TYPE_SIZE (gnu_type), true); - mutable_p = true; - } - - /* If we are at global level and the size isn't constant, call - elaborate_expression_1 to make a variable for it rather than - calculating it each time. */ - if (global_bindings_p () && !TREE_CONSTANT (gnu_size)) - gnu_size = elaborate_expression_1 (gnu_size, gnat_entity, - get_identifier ("SIZE"), - definition, false); - } - - /* If the size is zero byte, make it one byte since some linkers have - troubles with zero-sized objects. If the object will have a - template, that will make it nonzero so don't bother. Also avoid - doing that for an object renaming or an object with an address - clause, as we would lose useful information on the view size - (e.g. for null array slices) and we are not allocating the object - here anyway. */ - if (((gnu_size - && integer_zerop (gnu_size) - && !TREE_OVERFLOW (gnu_size)) - || (TYPE_SIZE (gnu_type) - && integer_zerop (TYPE_SIZE (gnu_type)) - && !TREE_OVERFLOW (TYPE_SIZE (gnu_type)))) - && (!Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) - || !Is_Array_Type (Etype (gnat_entity))) - && No (Renamed_Object (gnat_entity)) - && No (Address_Clause (gnat_entity))) - gnu_size = bitsize_unit_node; - - /* If this is an object with no specified size and alignment, and - if either it is atomic or we are not optimizing alignment for - space and it is composite and not an exception, an Out parameter - or a reference to another object, and the size of its type is a - constant, set the alignment to the smallest one which is not - smaller than the size, with an appropriate cap. */ - if (!gnu_size && align == 0 - && (Is_Atomic (gnat_entity) - || (!Optimize_Alignment_Space (gnat_entity) - && kind != E_Exception - && kind != E_Out_Parameter - && Is_Composite_Type (Etype (gnat_entity)) - && !Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) - && !Is_Exported (gnat_entity) - && !imported_p - && No (Renamed_Object (gnat_entity)) - && No (Address_Clause (gnat_entity)))) - && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST) - { - unsigned int size_cap, align_cap; - - /* No point in promoting the alignment if this doesn't prevent - BLKmode access to the object, in particular block copy, as - this will for example disable the NRV optimization for it. - No point in jumping through all the hoops needed in order - to support BIGGEST_ALIGNMENT if we don't really have to. - So we cap to the smallest alignment that corresponds to - a known efficient memory access pattern of the target. */ - if (Is_Atomic (gnat_entity)) - { - size_cap = UINT_MAX; - align_cap = BIGGEST_ALIGNMENT; - } - else - { - size_cap = MAX_FIXED_MODE_SIZE; - align_cap = get_mode_alignment (ptr_mode); - } - - if (!host_integerp (TYPE_SIZE (gnu_type), 1) - || compare_tree_int (TYPE_SIZE (gnu_type), size_cap) > 0) - align = 0; - else if (compare_tree_int (TYPE_SIZE (gnu_type), align_cap) > 0) - align = align_cap; - else - align = ceil_pow2 (tree_low_cst (TYPE_SIZE (gnu_type), 1)); - - /* But make sure not to under-align the object. */ - if (align <= TYPE_ALIGN (gnu_type)) - align = 0; - - /* And honor the minimum valid atomic alignment, if any. */ -#ifdef MINIMUM_ATOMIC_ALIGNMENT - else if (align < MINIMUM_ATOMIC_ALIGNMENT) - align = MINIMUM_ATOMIC_ALIGNMENT; -#endif - } - - /* If the object is set to have atomic components, find the component - type and validate it. - - ??? Note that we ignore Has_Volatile_Components on objects; it's - not at all clear what to do in that case. */ - if (Has_Atomic_Components (gnat_entity)) - { - tree gnu_inner = (TREE_CODE (gnu_type) == ARRAY_TYPE - ? TREE_TYPE (gnu_type) : gnu_type); - - while (TREE_CODE (gnu_inner) == ARRAY_TYPE - && TYPE_MULTI_ARRAY_P (gnu_inner)) - gnu_inner = TREE_TYPE (gnu_inner); - - check_ok_for_atomic (gnu_inner, gnat_entity, true); - } - - /* Now check if the type of the object allows atomic access. Note - that we must test the type, even if this object has size and - alignment to allow such access, because we will be going inside - the padded record to assign to the object. We could fix this by - always copying via an intermediate value, but it's not clear it's - worth the effort. */ - if (Is_Atomic (gnat_entity)) - check_ok_for_atomic (gnu_type, gnat_entity, false); - - /* If this is an aliased object with an unconstrained nominal subtype, - make a type that includes the template. */ - if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) - && Is_Array_Type (Etype (gnat_entity)) - && !type_annotate_only) - { - tree gnu_array - = gnat_to_gnu_type (Base_Type (Etype (gnat_entity))); - gnu_type - = build_unc_object_type_from_ptr (TREE_TYPE (gnu_array), - gnu_type, - concat_name (gnu_entity_name, - "UNC"), - debug_info_p); - } - - /* ??? If this is an object of CW type initialized to a value, try to - ensure that the object is sufficient aligned for this value, but - without pessimizing the allocation. This is a kludge necessary - because we don't support dynamic alignment. */ - if (align == 0 - && Ekind (Etype (gnat_entity)) == E_Class_Wide_Subtype - && No (Renamed_Object (gnat_entity)) - && No (Address_Clause (gnat_entity))) - align = get_target_system_allocator_alignment () * BITS_PER_UNIT; - -#ifdef MINIMUM_ATOMIC_ALIGNMENT - /* If the size is a constant and no alignment is specified, force - the alignment to be the minimum valid atomic alignment. The - restriction on constant size avoids problems with variable-size - temporaries; if the size is variable, there's no issue with - atomic access. Also don't do this for a constant, since it isn't - necessary and can interfere with constant replacement. Finally, - do not do it for Out parameters since that creates an - size inconsistency with In parameters. */ - if (align == 0 - && MINIMUM_ATOMIC_ALIGNMENT > TYPE_ALIGN (gnu_type) - && !FLOAT_TYPE_P (gnu_type) - && !const_flag && No (Renamed_Object (gnat_entity)) - && !imported_p && No (Address_Clause (gnat_entity)) - && kind != E_Out_Parameter - && (gnu_size ? TREE_CODE (gnu_size) == INTEGER_CST - : TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST)) - align = MINIMUM_ATOMIC_ALIGNMENT; -#endif - - /* Make a new type with the desired size and alignment, if needed. - But do not take into account alignment promotions to compute the - size of the object. */ - gnu_object_size = gnu_size ? gnu_size : TYPE_SIZE (gnu_type); - if (gnu_size || align > 0) - { - tree orig_type = gnu_type; - - gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, - false, false, definition, true); - - /* If a padding record was made, declare it now since it will - never be declared otherwise. This is necessary to ensure - that its subtrees are properly marked. */ - if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type))) - create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL, true, - debug_info_p, gnat_entity); - } - - /* If this is a renaming, avoid as much as possible to create a new - object. However, in several cases, creating it is required. - This processing needs to be applied to the raw expression so - as to make it more likely to rename the underlying object. */ - if (Present (Renamed_Object (gnat_entity))) - { - bool create_normal_object = false; - - /* If the renamed object had padding, strip off the reference - to the inner object and reset our type. */ - if ((TREE_CODE (gnu_expr) == COMPONENT_REF - && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))) - /* Strip useless conversions around the object. */ - || gnat_useless_type_conversion (gnu_expr)) - { - gnu_expr = TREE_OPERAND (gnu_expr, 0); - gnu_type = TREE_TYPE (gnu_expr); - } - - /* Or else, if the renamed object has an unconstrained type with - default discriminant, use the padded type. */ - else if (TYPE_IS_PADDING_P (TREE_TYPE (gnu_expr)) - && TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_expr))) - == gnu_type - && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) - gnu_type = TREE_TYPE (gnu_expr); - - /* Case 1: If this is a constant renaming stemming from a function - call, treat it as a normal object whose initial value is what - is being renamed. RM 3.3 says that the result of evaluating a - function call is a constant object. As a consequence, it can - be the inner object of a constant renaming. In this case, the - renaming must be fully instantiated, i.e. it cannot be a mere - reference to (part of) an existing object. */ - if (const_flag) - { - tree inner_object = gnu_expr; - while (handled_component_p (inner_object)) - inner_object = TREE_OPERAND (inner_object, 0); - if (TREE_CODE (inner_object) == CALL_EXPR) - create_normal_object = true; - } - - /* Otherwise, see if we can proceed with a stabilized version of - the renamed entity or if we need to make a new object. */ - if (!create_normal_object) - { - tree maybe_stable_expr = NULL_TREE; - bool stable = false; - - /* Case 2: If the renaming entity need not be materialized and - the renamed expression is something we can stabilize, use - that for the renaming. At the global level, we can only do - this if we know no SAVE_EXPRs need be made, because the - expression we return might be used in arbitrary conditional - branches so we must force the evaluation of the SAVE_EXPRs - immediately and this requires a proper function context. - Note that an external constant is at the global level. */ - if (!Materialize_Entity (gnat_entity) - && (!((!definition && kind == E_Constant) - || global_bindings_p ()) - || (staticp (gnu_expr) - && !TREE_SIDE_EFFECTS (gnu_expr)))) - { - maybe_stable_expr - = gnat_stabilize_reference (gnu_expr, true, &stable); - - if (stable) - { - /* ??? No DECL_EXPR is created so we need to mark - the expression manually lest it is shared. */ - if ((!definition && kind == E_Constant) - || global_bindings_p ()) - MARK_VISITED (maybe_stable_expr); - gnu_decl = maybe_stable_expr; - save_gnu_tree (gnat_entity, gnu_decl, true); - saved = true; - annotate_object (gnat_entity, gnu_type, NULL_TREE, - false, false); - /* This assertion will fail if the renamed object - isn't aligned enough as to make it possible to - honor the alignment set on the renaming. */ - if (align) - { - unsigned int renamed_align - = DECL_P (gnu_decl) - ? DECL_ALIGN (gnu_decl) - : TYPE_ALIGN (TREE_TYPE (gnu_decl)); - gcc_assert (renamed_align >= align); - } - break; - } - - /* The stabilization failed. Keep maybe_stable_expr - untouched here to let the pointer case below know - about that failure. */ - } - - /* Case 3: If this is a constant renaming and creating a - new object is allowed and cheap, treat it as a normal - object whose initial value is what is being renamed. */ - if (const_flag - && !Is_Composite_Type - (Underlying_Type (Etype (gnat_entity)))) - ; - - /* Case 4: Make this into a constant pointer to the object we - are to rename and attach the object to the pointer if it is - something we can stabilize. - - From the proper scope, attached objects will be referenced - directly instead of indirectly via the pointer to avoid - subtle aliasing problems with non-addressable entities. - They have to be stable because we must not evaluate the - variables in the expression every time the renaming is used. - The pointer is called a "renaming" pointer in this case. - - In the rare cases where we cannot stabilize the renamed - object, we just make a "bare" pointer, and the renamed - entity is always accessed indirectly through it. */ - else - { - /* We need to preserve the volatileness of the renamed - object through the indirection. */ - if (TREE_THIS_VOLATILE (gnu_expr) - && !TYPE_VOLATILE (gnu_type)) - gnu_type - = build_qualified_type (gnu_type, - (TYPE_QUALS (gnu_type) - | TYPE_QUAL_VOLATILE)); - gnu_type = build_reference_type (gnu_type); - inner_const_flag = TREE_READONLY (gnu_expr); - const_flag = true; - - /* If the previous attempt at stabilizing failed, there - is no point in trying again and we reuse the result - without attaching it to the pointer. In this case it - will only be used as the initializing expression of - the pointer and thus needs no special treatment with - regard to multiple evaluations. */ - if (maybe_stable_expr) - ; - - /* Otherwise, try to stabilize and attach the expression - to the pointer if the stabilization succeeds. - - Note that this might introduce SAVE_EXPRs and we don't - check whether we're at the global level or not. This - is fine since we are building a pointer initializer and - neither the pointer nor the initializing expression can - be accessed before the pointer elaboration has taken - place in a correct program. - - These SAVE_EXPRs will be evaluated at the right place - by either the evaluation of the initializer for the - non-global case or the elaboration code for the global - case, and will be attached to the elaboration procedure - in the latter case. */ - else - { - maybe_stable_expr - = gnat_stabilize_reference (gnu_expr, true, &stable); - - if (stable) - renamed_obj = maybe_stable_expr; - - /* Attaching is actually performed downstream, as soon - as we have a VAR_DECL for the pointer we make. */ - } - - gnu_expr = build_unary_op (ADDR_EXPR, gnu_type, - maybe_stable_expr); - - gnu_size = NULL_TREE; - used_by_ref = true; - } - } - } - - /* Make a volatile version of this object's type if we are to make - the object volatile. We also interpret 13.3(19) conservatively - and disallow any optimizations for such a non-constant object. */ - if ((Treat_As_Volatile (gnat_entity) - || (!const_flag - && gnu_type != except_type_node - && (Is_Exported (gnat_entity) - || imported_p - || Present (Address_Clause (gnat_entity))))) - && !TYPE_VOLATILE (gnu_type)) - gnu_type = build_qualified_type (gnu_type, - (TYPE_QUALS (gnu_type) - | TYPE_QUAL_VOLATILE)); - - /* If we are defining an aliased object whose nominal subtype is - unconstrained, the object is a record that contains both the - template and the object. If there is an initializer, it will - have already been converted to the right type, but we need to - create the template if there is no initializer. */ - if (definition - && !gnu_expr - && TREE_CODE (gnu_type) == RECORD_TYPE - && (TYPE_CONTAINS_TEMPLATE_P (gnu_type) - /* Beware that padding might have been introduced above. */ - || (TYPE_PADDING_P (gnu_type) - && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) - == RECORD_TYPE - && TYPE_CONTAINS_TEMPLATE_P - (TREE_TYPE (TYPE_FIELDS (gnu_type)))))) - { - tree template_field - = TYPE_PADDING_P (gnu_type) - ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type))) - : TYPE_FIELDS (gnu_type); - vec<constructor_elt, va_gc> *v; - vec_alloc (v, 1); - tree t = build_template (TREE_TYPE (template_field), - TREE_TYPE (DECL_CHAIN (template_field)), - NULL_TREE); - CONSTRUCTOR_APPEND_ELT (v, template_field, t); - gnu_expr = gnat_build_constructor (gnu_type, v); - } - - /* Convert the expression to the type of the object except in the - case where the object's type is unconstrained or the object's type - is a padded record whose field is of self-referential size. In - the former case, converting will generate unnecessary evaluations - of the CONSTRUCTOR to compute the size and in the latter case, we - want to only copy the actual data. Also don't convert to a record - type with a variant part from a record type without one, to keep - the object simpler. */ - if (gnu_expr - && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE - && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) - && !(TYPE_IS_PADDING_P (gnu_type) - && CONTAINS_PLACEHOLDER_P - (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type))))) - && !(TREE_CODE (gnu_type) == RECORD_TYPE - && TREE_CODE (TREE_TYPE (gnu_expr)) == RECORD_TYPE - && get_variant_part (gnu_type) != NULL_TREE - && get_variant_part (TREE_TYPE (gnu_expr)) == NULL_TREE)) - gnu_expr = convert (gnu_type, gnu_expr); - - /* If this is a pointer that doesn't have an initializing expression, - initialize it to NULL, unless the object is imported. */ - if (definition - && (POINTER_TYPE_P (gnu_type) || TYPE_IS_FAT_POINTER_P (gnu_type)) - && !gnu_expr - && !Is_Imported (gnat_entity)) - gnu_expr = integer_zero_node; - - /* If we are defining the object and it has an Address clause, we must - either get the address expression from the saved GCC tree for the - object if it has a Freeze node, or elaborate the address expression - here since the front-end has guaranteed that the elaboration has no - effects in this case. */ - if (definition && Present (Address_Clause (gnat_entity))) - { - Node_Id gnat_expr = Expression (Address_Clause (gnat_entity)); - tree gnu_address - = present_gnu_tree (gnat_entity) - ? get_gnu_tree (gnat_entity) : gnat_to_gnu (gnat_expr); - - save_gnu_tree (gnat_entity, NULL_TREE, false); - - /* Ignore the size. It's either meaningless or was handled - above. */ - gnu_size = NULL_TREE; - /* Convert the type of the object to a reference type that can - alias everything as per 13.3(19). */ - gnu_type - = build_reference_type_for_mode (gnu_type, ptr_mode, true); - gnu_address = convert (gnu_type, gnu_address); - used_by_ref = true; - const_flag - = !Is_Public (gnat_entity) - || compile_time_known_address_p (gnat_expr); - - /* If this is a deferred constant, the initializer is attached to - the full view. */ - if (kind == E_Constant && Present (Full_View (gnat_entity))) - gnu_expr - = gnat_to_gnu - (Expression (Declaration_Node (Full_View (gnat_entity)))); - - /* If we don't have an initializing expression for the underlying - variable, the initializing expression for the pointer is the - specified address. Otherwise, we have to make a COMPOUND_EXPR - to assign both the address and the initial value. */ - if (!gnu_expr) - gnu_expr = gnu_address; - else - gnu_expr - = build2 (COMPOUND_EXPR, gnu_type, - build_binary_op - (MODIFY_EXPR, NULL_TREE, - build_unary_op (INDIRECT_REF, NULL_TREE, - gnu_address), - gnu_expr), - gnu_address); - } - - /* If it has an address clause and we are not defining it, mark it - as an indirect object. Likewise for Stdcall objects that are - imported. */ - if ((!definition && Present (Address_Clause (gnat_entity))) - || (Is_Imported (gnat_entity) - && Has_Stdcall_Convention (gnat_entity))) - { - /* Convert the type of the object to a reference type that can - alias everything as per 13.3(19). */ - gnu_type - = build_reference_type_for_mode (gnu_type, ptr_mode, true); - gnu_size = NULL_TREE; - - /* No point in taking the address of an initializing expression - that isn't going to be used. */ - gnu_expr = NULL_TREE; - - /* If it has an address clause whose value is known at compile - time, make the object a CONST_DECL. This will avoid a - useless dereference. */ - if (Present (Address_Clause (gnat_entity))) - { - Node_Id gnat_address - = Expression (Address_Clause (gnat_entity)); - - if (compile_time_known_address_p (gnat_address)) - { - gnu_expr = gnat_to_gnu (gnat_address); - const_flag = true; - } - } - - used_by_ref = true; - } - - /* If we are at top level and this object is of variable size, - make the actual type a hidden pointer to the real type and - make the initializer be a memory allocation and initialization. - Likewise for objects we aren't defining (presumed to be - external references from other packages), but there we do - not set up an initialization. - - If the object's size overflows, make an allocator too, so that - Storage_Error gets raised. Note that we will never free - such memory, so we presume it never will get allocated. */ - if (!allocatable_size_p (TYPE_SIZE_UNIT (gnu_type), - global_bindings_p () - || !definition - || static_p) - || (gnu_size - && !allocatable_size_p (convert (sizetype, - size_binop - (CEIL_DIV_EXPR, gnu_size, - bitsize_unit_node)), - global_bindings_p () - || !definition - || static_p))) - { - gnu_type = build_reference_type (gnu_type); - gnu_size = NULL_TREE; - used_by_ref = true; - - /* In case this was a aliased object whose nominal subtype is - unconstrained, the pointer above will be a thin pointer and - build_allocator will automatically make the template. - - If we have a template initializer only (that we made above), - pretend there is none and rely on what build_allocator creates - again anyway. Otherwise (if we have a full initializer), get - the data part and feed that to build_allocator. - - If we are elaborating a mutable object, tell build_allocator to - ignore a possibly simpler size from the initializer, if any, as - we must allocate the maximum possible size in this case. */ - if (definition && !imported_p) - { - tree gnu_alloc_type = TREE_TYPE (gnu_type); - - if (TREE_CODE (gnu_alloc_type) == RECORD_TYPE - && TYPE_CONTAINS_TEMPLATE_P (gnu_alloc_type)) - { - gnu_alloc_type - = TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_alloc_type))); - - if (TREE_CODE (gnu_expr) == CONSTRUCTOR - && 1 == vec_safe_length (CONSTRUCTOR_ELTS (gnu_expr))) - gnu_expr = 0; - else - gnu_expr - = build_component_ref - (gnu_expr, NULL_TREE, - DECL_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))), - false); - } - - if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST - && !valid_constant_size_p (TYPE_SIZE_UNIT (gnu_alloc_type))) - post_error ("?`Storage_Error` will be raised at run time!", - gnat_entity); - - gnu_expr - = build_allocator (gnu_alloc_type, gnu_expr, gnu_type, - Empty, Empty, gnat_entity, mutable_p); - const_flag = true; - } - else - { - gnu_expr = NULL_TREE; - const_flag = false; - } - } - - /* If this object would go into the stack and has an alignment larger - than the largest stack alignment the back-end can honor, resort to - a variable of "aligning type". */ - if (!global_bindings_p () && !static_p && definition - && !imported_p && TYPE_ALIGN (gnu_type) > BIGGEST_ALIGNMENT) - { - /* Create the new variable. No need for extra room before the - aligned field as this is in automatic storage. */ - tree gnu_new_type - = make_aligning_type (gnu_type, TYPE_ALIGN (gnu_type), - TYPE_SIZE_UNIT (gnu_type), - BIGGEST_ALIGNMENT, 0); - tree gnu_new_var - = create_var_decl (create_concat_name (gnat_entity, "ALIGN"), - NULL_TREE, gnu_new_type, NULL_TREE, false, - false, false, false, NULL, gnat_entity); - - /* Initialize the aligned field if we have an initializer. */ - if (gnu_expr) - add_stmt_with_node - (build_binary_op (MODIFY_EXPR, NULL_TREE, - build_component_ref - (gnu_new_var, NULL_TREE, - TYPE_FIELDS (gnu_new_type), false), - gnu_expr), - gnat_entity); - - /* And setup this entity as a reference to the aligned field. */ - gnu_type = build_reference_type (gnu_type); - gnu_expr - = build_unary_op - (ADDR_EXPR, gnu_type, - build_component_ref (gnu_new_var, NULL_TREE, - TYPE_FIELDS (gnu_new_type), false)); - - gnu_size = NULL_TREE; - used_by_ref = true; - const_flag = true; - } - - /* If this is an aliased object with an unconstrained nominal subtype, - we make its type a thin reference, i.e. the reference counterpart - of a thin pointer, so that it points to the array part. This is - aimed at making it easier for the debugger to decode the object. - Note that we have to do that this late because of the couple of - allocation adjustments that might be made just above. */ - if (Is_Constr_Subt_For_UN_Aliased (Etype (gnat_entity)) - && Is_Array_Type (Etype (gnat_entity)) - && !type_annotate_only) - { - tree gnu_array - = gnat_to_gnu_type (Base_Type (Etype (gnat_entity))); - - /* In case the object with the template has already been allocated - just above, we have nothing to do here. */ - if (!TYPE_IS_THIN_POINTER_P (gnu_type)) - { - gnu_size = NULL_TREE; - used_by_ref = true; - - if (definition && !imported_p) - { - tree gnu_unc_var - = create_var_decl (concat_name (gnu_entity_name, "UNC"), - NULL_TREE, gnu_type, gnu_expr, - const_flag, Is_Public (gnat_entity), - false, static_p, NULL, gnat_entity); - gnu_expr - = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_unc_var); - TREE_CONSTANT (gnu_expr) = 1; - const_flag = true; - } - else - { - gnu_expr = NULL_TREE; - const_flag = false; - } - } - - gnu_type - = build_reference_type (TYPE_OBJECT_RECORD_TYPE (gnu_array)); - } - - if (const_flag) - gnu_type = build_qualified_type (gnu_type, (TYPE_QUALS (gnu_type) - | TYPE_QUAL_CONST)); - - /* Convert the expression to the type of the object except in the - case where the object's type is unconstrained or the object's type - is a padded record whose field is of self-referential size. In - the former case, converting will generate unnecessary evaluations - of the CONSTRUCTOR to compute the size and in the latter case, we - want to only copy the actual data. Also don't convert to a record - type with a variant part from a record type without one, to keep - the object simpler. */ - if (gnu_expr - && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE - && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) - && !(TYPE_IS_PADDING_P (gnu_type) - && CONTAINS_PLACEHOLDER_P - (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type))))) - && !(TREE_CODE (gnu_type) == RECORD_TYPE - && TREE_CODE (TREE_TYPE (gnu_expr)) == RECORD_TYPE - && get_variant_part (gnu_type) != NULL_TREE - && get_variant_part (TREE_TYPE (gnu_expr)) == NULL_TREE)) - gnu_expr = convert (gnu_type, gnu_expr); - - /* If this name is external or there was a name specified, use it, - unless this is a VMS exception object since this would conflict - with the symbol we need to export in addition. Don't use the - Interface_Name if there is an address clause (see CD30005). */ - if (!Is_VMS_Exception (gnat_entity) - && ((Present (Interface_Name (gnat_entity)) - && No (Address_Clause (gnat_entity))) - || (Is_Public (gnat_entity) - && (!Is_Imported (gnat_entity) - || Is_Exported (gnat_entity))))) - gnu_ext_name = create_concat_name (gnat_entity, NULL); - - /* If this is an aggregate constant initialized to a constant, force it - to be statically allocated. This saves an initialization copy. */ - if (!static_p - && const_flag - && gnu_expr && TREE_CONSTANT (gnu_expr) - && AGGREGATE_TYPE_P (gnu_type) - && host_integerp (TYPE_SIZE_UNIT (gnu_type), 1) - && !(TYPE_IS_PADDING_P (gnu_type) - && !host_integerp (TYPE_SIZE_UNIT - (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1))) - static_p = true; - - /* Now create the variable or the constant and set various flags. */ - gnu_decl - = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, - gnu_expr, const_flag, Is_Public (gnat_entity), - imported_p || !definition, static_p, attr_list, - gnat_entity); - DECL_BY_REF_P (gnu_decl) = used_by_ref; - DECL_POINTS_TO_READONLY_P (gnu_decl) = used_by_ref && inner_const_flag; - DECL_CAN_NEVER_BE_NULL_P (gnu_decl) = Can_Never_Be_Null (gnat_entity); - - /* If we are defining an Out parameter and optimization isn't enabled, - create a fake PARM_DECL for debugging purposes and make it point to - the VAR_DECL. Suppress debug info for the latter but make sure it - will live on the stack so that it can be accessed from within the - debugger through the PARM_DECL. */ - if (kind == E_Out_Parameter - && definition - && debug_info_p - && !optimize - && !flag_generate_lto) - { - tree param = create_param_decl (gnu_entity_name, gnu_type, false); - gnat_pushdecl (param, gnat_entity); - SET_DECL_VALUE_EXPR (param, gnu_decl); - DECL_HAS_VALUE_EXPR_P (param) = 1; - DECL_IGNORED_P (gnu_decl) = 1; - TREE_ADDRESSABLE (gnu_decl) = 1; - } - - /* If this is a loop parameter, set the corresponding flag. */ - else if (kind == E_Loop_Parameter) - DECL_LOOP_PARM_P (gnu_decl) = 1; - - /* If this is a renaming pointer, attach the renamed object to it and - register it if we are at the global level. Note that an external - constant is at the global level. */ - else if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj) - { - SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj); - if ((!definition && kind == E_Constant) || global_bindings_p ()) - { - DECL_RENAMING_GLOBAL_P (gnu_decl) = 1; - record_global_renaming_pointer (gnu_decl); - } - } - - /* If this is a constant and we are defining it or it generates a real - symbol at the object level and we are referencing it, we may want - or need to have a true variable to represent it: - - if optimization isn't enabled, for debugging purposes, - - if the constant is public and not overlaid on something else, - - if its address is taken, - - if either itself or its type is aliased. */ - if (TREE_CODE (gnu_decl) == CONST_DECL - && (definition || Sloc (gnat_entity) > Standard_Location) - && ((!optimize && debug_info_p) - || (Is_Public (gnat_entity) - && No (Address_Clause (gnat_entity))) - || Address_Taken (gnat_entity) - || Is_Aliased (gnat_entity) - || Is_Aliased (Etype (gnat_entity)))) - { - tree gnu_corr_var - = create_true_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, - gnu_expr, true, Is_Public (gnat_entity), - !definition, static_p, attr_list, - gnat_entity); - - SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var); - - /* As debugging information will be generated for the variable, - do not generate debugging information for the constant. */ - if (debug_info_p) - DECL_IGNORED_P (gnu_decl) = 1; - else - DECL_IGNORED_P (gnu_corr_var) = 1; - } - - /* If this is a constant, even if we don't need a true variable, we - may need to avoid returning the initializer in every case. That - can happen for the address of a (constant) constructor because, - upon dereferencing it, the constructor will be reinjected in the - tree, which may not be valid in every case; see lvalue_required_p - for more details. */ - if (TREE_CODE (gnu_decl) == CONST_DECL) - DECL_CONST_ADDRESS_P (gnu_decl) = constructor_address_p (gnu_expr); - - /* If this object is declared in a block that contains a block with an - exception handler, and we aren't using the GCC exception mechanism, - we must force this variable in memory in order to avoid an invalid - optimization. */ - if (Exception_Mechanism != Back_End_Exceptions - && Has_Nested_Block_With_Handler (Scope (gnat_entity))) - TREE_ADDRESSABLE (gnu_decl) = 1; - - /* If we are defining an object with variable size or an object with - fixed size that will be dynamically allocated, and we are using the - setjmp/longjmp exception mechanism, update the setjmp buffer. */ - if (definition - && Exception_Mechanism == Setjmp_Longjmp - && get_block_jmpbuf_decl () - && DECL_SIZE_UNIT (gnu_decl) - && (TREE_CODE (DECL_SIZE_UNIT (gnu_decl)) != INTEGER_CST - || (flag_stack_check == GENERIC_STACK_CHECK - && compare_tree_int (DECL_SIZE_UNIT (gnu_decl), - STACK_CHECK_MAX_VAR_SIZE) > 0))) - add_stmt_with_node (build_call_n_expr - (update_setjmp_buf_decl, 1, - build_unary_op (ADDR_EXPR, NULL_TREE, - get_block_jmpbuf_decl ())), - gnat_entity); - - /* Back-annotate Esize and Alignment of the object if not already - known. Note that we pick the values of the type, not those of - the object, to shield ourselves from low-level platform-dependent - adjustments like alignment promotion. This is both consistent with - all the treatment above, where alignment and size are set on the - type of the object and not on the object directly, and makes it - possible to support all confirming representation clauses. */ - annotate_object (gnat_entity, TREE_TYPE (gnu_decl), gnu_object_size, - used_by_ref, false); - } - break; - - case E_Void: - /* Return a TYPE_DECL for "void" that we previously made. */ - gnu_decl = TYPE_NAME (void_type_node); - break; - - case E_Enumeration_Type: - /* A special case: for the types Character and Wide_Character in - Standard, we do not list all the literals. So if the literals - are not specified, make this an unsigned type. */ - if (No (First_Literal (gnat_entity))) - { - gnu_type = make_unsigned_type (esize); - TYPE_NAME (gnu_type) = gnu_entity_name; - - /* Set TYPE_STRING_FLAG for Character and Wide_Character types. - This is needed by the DWARF-2 back-end to distinguish between - unsigned integer types and character types. */ - TYPE_STRING_FLAG (gnu_type) = 1; - break; - } - - { - /* We have a list of enumeral constants in First_Literal. We make a - CONST_DECL for each one and build into GNU_LITERAL_LIST the list to - be placed into TYPE_FIELDS. Each node in the list is a TREE_LIST - whose TREE_VALUE is the literal name and whose TREE_PURPOSE is the - value of the literal. But when we have a regular boolean type, we - simplify this a little by using a BOOLEAN_TYPE. */ - bool is_boolean = Is_Boolean_Type (gnat_entity) - && !Has_Non_Standard_Rep (gnat_entity); - tree gnu_literal_list = NULL_TREE; - Entity_Id gnat_literal; - - if (Is_Unsigned_Type (gnat_entity)) - gnu_type = make_unsigned_type (esize); - else - gnu_type = make_signed_type (esize); - - TREE_SET_CODE (gnu_type, is_boolean ? BOOLEAN_TYPE : ENUMERAL_TYPE); - - for (gnat_literal = First_Literal (gnat_entity); - Present (gnat_literal); - gnat_literal = Next_Literal (gnat_literal)) - { - tree gnu_value - = UI_To_gnu (Enumeration_Rep (gnat_literal), gnu_type); - tree gnu_literal - = create_var_decl (get_entity_name (gnat_literal), NULL_TREE, - gnu_type, gnu_value, true, false, false, - false, NULL, gnat_literal); - /* Do not generate debug info for individual enumerators. */ - DECL_IGNORED_P (gnu_literal) = 1; - save_gnu_tree (gnat_literal, gnu_literal, false); - gnu_literal_list = tree_cons (DECL_NAME (gnu_literal), - gnu_value, gnu_literal_list); - } - - if (!is_boolean) - TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list); - - /* Note that the bounds are updated at the end of this function - to avoid an infinite recursion since they refer to the type. */ - } - goto discrete_type; - - case E_Signed_Integer_Type: - case E_Ordinary_Fixed_Point_Type: - case E_Decimal_Fixed_Point_Type: - /* For integer types, just make a signed type the appropriate number - of bits. */ - gnu_type = make_signed_type (esize); - goto discrete_type; - - case E_Modular_Integer_Type: - { - /* For modular types, make the unsigned type of the proper number - of bits and then set up the modulus, if required. */ - tree gnu_modulus, gnu_high = NULL_TREE; - - /* Packed array types are supposed to be subtypes only. */ - gcc_assert (!Is_Packed_Array_Type (gnat_entity)); - - gnu_type = make_unsigned_type (esize); - - /* Get the modulus in this type. If it overflows, assume it is because - it is equal to 2**Esize. Note that there is no overflow checking - done on unsigned type, so we detect the overflow by looking for - a modulus of zero, which is otherwise invalid. */ - gnu_modulus = UI_To_gnu (Modulus (gnat_entity), gnu_type); - - if (!integer_zerop (gnu_modulus)) - { - TYPE_MODULAR_P (gnu_type) = 1; - SET_TYPE_MODULUS (gnu_type, gnu_modulus); - gnu_high = fold_build2 (MINUS_EXPR, gnu_type, gnu_modulus, - convert (gnu_type, integer_one_node)); - } - - /* If the upper bound is not maximal, make an extra subtype. */ - if (gnu_high - && !tree_int_cst_equal (gnu_high, TYPE_MAX_VALUE (gnu_type))) - { - tree gnu_subtype = make_unsigned_type (esize); - SET_TYPE_RM_MAX_VALUE (gnu_subtype, gnu_high); - TREE_TYPE (gnu_subtype) = gnu_type; - TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; - TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT"); - gnu_type = gnu_subtype; - } - } - goto discrete_type; - - case E_Signed_Integer_Subtype: - case E_Enumeration_Subtype: - case E_Modular_Integer_Subtype: - case E_Ordinary_Fixed_Point_Subtype: - case E_Decimal_Fixed_Point_Subtype: - - /* For integral subtypes, we make a new INTEGER_TYPE. Note that we do - not want to call create_range_type since we would like each subtype - node to be distinct. ??? Historically this was in preparation for - when memory aliasing is implemented, but that's obsolete now given - the call to relate_alias_sets below. - - The TREE_TYPE field of the INTEGER_TYPE points to the base type; - this fact is used by the arithmetic conversion functions. - - We elaborate the Ancestor_Subtype if it is not in the current unit - and one of our bounds is non-static. We do this to ensure consistent - naming in the case where several subtypes share the same bounds, by - elaborating the first such subtype first, thus using its name. */ - - if (!definition - && Present (Ancestor_Subtype (gnat_entity)) - && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity)) - && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity)) - || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity)))) - gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), gnu_expr, 0); - - /* Set the precision to the Esize except for bit-packed arrays. */ - if (Is_Packed_Array_Type (gnat_entity) - && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) - esize = UI_To_Int (RM_Size (gnat_entity)); - - /* This should be an unsigned type if the base type is unsigned or - if the lower bound is constant and non-negative or if the type - is biased. */ - if (Is_Unsigned_Type (Etype (gnat_entity)) - || Is_Unsigned_Type (gnat_entity) - || Has_Biased_Representation (gnat_entity)) - gnu_type = make_unsigned_type (esize); - else - gnu_type = make_signed_type (esize); - TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); - - SET_TYPE_RM_MIN_VALUE - (gnu_type, - convert (TREE_TYPE (gnu_type), - elaborate_expression (Type_Low_Bound (gnat_entity), - gnat_entity, get_identifier ("L"), - definition, true, - Needs_Debug_Info (gnat_entity)))); - - SET_TYPE_RM_MAX_VALUE - (gnu_type, - convert (TREE_TYPE (gnu_type), - elaborate_expression (Type_High_Bound (gnat_entity), - gnat_entity, get_identifier ("U"), - definition, true, - Needs_Debug_Info (gnat_entity)))); - - /* One of the above calls might have caused us to be elaborated, - so don't blow up if so. */ - if (present_gnu_tree (gnat_entity)) - { - maybe_present = true; - break; - } - - TYPE_BIASED_REPRESENTATION_P (gnu_type) - = Has_Biased_Representation (gnat_entity); - - /* Attach the TYPE_STUB_DECL in case we have a parallel type. */ - TYPE_STUB_DECL (gnu_type) - = create_type_stub_decl (gnu_entity_name, gnu_type); - - /* Inherit our alias set from what we're a subtype of. Subtypes - are not different types and a pointer can designate any instance - within a subtype hierarchy. */ - relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY); - - /* For a packed array, make the original array type a parallel type. */ - if (debug_info_p - && Is_Packed_Array_Type (gnat_entity) - && present_gnu_tree (Original_Array_Type (gnat_entity))) - add_parallel_type (gnu_type, - gnat_to_gnu_type - (Original_Array_Type (gnat_entity))); - - discrete_type: - - /* We have to handle clauses that under-align the type specially. */ - if ((Present (Alignment_Clause (gnat_entity)) - || (Is_Packed_Array_Type (gnat_entity) - && Present - (Alignment_Clause (Original_Array_Type (gnat_entity))))) - && UI_Is_In_Int_Range (Alignment (gnat_entity))) - { - align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT; - if (align >= TYPE_ALIGN (gnu_type)) - align = 0; - } - - /* If the type we are dealing with represents a bit-packed array, - we need to have the bits left justified on big-endian targets - and right justified on little-endian targets. We also need to - ensure that when the value is read (e.g. for comparison of two - such values), we only get the good bits, since the unused bits - are uninitialized. Both goals are accomplished by wrapping up - the modular type in an enclosing record type. */ - if (Is_Packed_Array_Type (gnat_entity) - && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) - { - tree gnu_field_type, gnu_field; - - /* Set the RM size before wrapping up the original type. */ - SET_TYPE_RM_SIZE (gnu_type, - UI_To_gnu (RM_Size (gnat_entity), bitsizetype)); - TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1; - - /* Create a stripped-down declaration, mainly for debugging. */ - create_type_decl (gnu_entity_name, gnu_type, NULL, true, - debug_info_p, gnat_entity); - - /* Now save it and build the enclosing record type. */ - gnu_field_type = gnu_type; - - gnu_type = make_node (RECORD_TYPE); - TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM"); - TYPE_PACKED (gnu_type) = 1; - TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type); - TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type); - SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type)); - - /* Propagate the alignment of the modular type to the record type, - unless there is an alignment clause that under-aligns the type. - This means that bit-packed arrays are given "ceil" alignment for - their size by default, which may seem counter-intuitive but makes - it possible to overlay them on modular types easily. */ - TYPE_ALIGN (gnu_type) - = align > 0 ? align : TYPE_ALIGN (gnu_field_type); - - relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY); - - /* Don't declare the field as addressable since we won't be taking - its address and this would prevent create_field_decl from making - a bitfield. */ - gnu_field - = create_field_decl (get_identifier ("OBJECT"), gnu_field_type, - gnu_type, NULL_TREE, bitsize_zero_node, 1, 0); - - /* Do not emit debug info until after the parallel type is added. */ - finish_record_type (gnu_type, gnu_field, 2, false); - compute_record_mode (gnu_type); - TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1; - - if (debug_info_p) - { - /* Make the original array type a parallel type. */ - if (present_gnu_tree (Original_Array_Type (gnat_entity))) - add_parallel_type (gnu_type, - gnat_to_gnu_type - (Original_Array_Type (gnat_entity))); - - rest_of_record_type_compilation (gnu_type); - } - } - - /* If the type we are dealing with has got a smaller alignment than the - natural one, we need to wrap it up in a record type and misalign the - latter; we reuse the padding machinery for this purpose. Note that, - even if the record type is marked as packed because of misalignment, - we don't pack the field so as to give it the size of the type. */ - else if (align > 0) - { - tree gnu_field_type, gnu_field; - - /* Set the RM size before wrapping up the type. */ - SET_TYPE_RM_SIZE (gnu_type, - UI_To_gnu (RM_Size (gnat_entity), bitsizetype)); - - /* Create a stripped-down declaration, mainly for debugging. */ - create_type_decl (gnu_entity_name, gnu_type, NULL, true, - debug_info_p, gnat_entity); - - /* Now save it and build the enclosing record type. */ - gnu_field_type = gnu_type; - - gnu_type = make_node (RECORD_TYPE); - TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD"); - TYPE_PACKED (gnu_type) = 1; - TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type); - TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type); - SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type)); - TYPE_ALIGN (gnu_type) = align; - relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY); - - /* Don't declare the field as addressable since we won't be taking - its address and this would prevent create_field_decl from making - a bitfield. */ - gnu_field - = create_field_decl (get_identifier ("F"), gnu_field_type, - gnu_type, TYPE_SIZE (gnu_field_type), - bitsize_zero_node, 0, 0); - - finish_record_type (gnu_type, gnu_field, 2, debug_info_p); - compute_record_mode (gnu_type); - TYPE_PADDING_P (gnu_type) = 1; - } - - break; - - case E_Floating_Point_Type: - /* If this is a VAX floating-point type, use an integer of the proper - size. All the operations will be handled with ASM statements. */ - if (Vax_Float (gnat_entity)) - { - gnu_type = make_signed_type (esize); - TYPE_VAX_FLOATING_POINT_P (gnu_type) = 1; - SET_TYPE_DIGITS_VALUE (gnu_type, - UI_To_gnu (Digits_Value (gnat_entity), - sizetype)); - break; - } - - /* The type of the Low and High bounds can be our type if this is - a type from Standard, so set them at the end of the function. */ - gnu_type = make_node (REAL_TYPE); - TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize); - layout_type (gnu_type); - break; - - case E_Floating_Point_Subtype: - if (Vax_Float (gnat_entity)) - { - gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); - break; - } - - { - if (!definition - && Present (Ancestor_Subtype (gnat_entity)) - && !In_Extended_Main_Code_Unit (Ancestor_Subtype (gnat_entity)) - && (!Compile_Time_Known_Value (Type_Low_Bound (gnat_entity)) - || !Compile_Time_Known_Value (Type_High_Bound (gnat_entity)))) - gnat_to_gnu_entity (Ancestor_Subtype (gnat_entity), - gnu_expr, 0); - - gnu_type = make_node (REAL_TYPE); - TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); - TYPE_PRECISION (gnu_type) = fp_size_to_prec (esize); - TYPE_GCC_MIN_VALUE (gnu_type) - = TYPE_GCC_MIN_VALUE (TREE_TYPE (gnu_type)); - TYPE_GCC_MAX_VALUE (gnu_type) - = TYPE_GCC_MAX_VALUE (TREE_TYPE (gnu_type)); - layout_type (gnu_type); - - SET_TYPE_RM_MIN_VALUE - (gnu_type, - convert (TREE_TYPE (gnu_type), - elaborate_expression (Type_Low_Bound (gnat_entity), - gnat_entity, get_identifier ("L"), - definition, true, - Needs_Debug_Info (gnat_entity)))); - - SET_TYPE_RM_MAX_VALUE - (gnu_type, - convert (TREE_TYPE (gnu_type), - elaborate_expression (Type_High_Bound (gnat_entity), - gnat_entity, get_identifier ("U"), - definition, true, - Needs_Debug_Info (gnat_entity)))); - - /* One of the above calls might have caused us to be elaborated, - so don't blow up if so. */ - if (present_gnu_tree (gnat_entity)) - { - maybe_present = true; - break; - } - - /* Inherit our alias set from what we're a subtype of, as for - integer subtypes. */ - relate_alias_sets (gnu_type, TREE_TYPE (gnu_type), ALIAS_SET_COPY); - } - break; - - /* Array and String Types and Subtypes - - Unconstrained array types are represented by E_Array_Type and - constrained array types are represented by E_Array_Subtype. There - are no actual objects of an unconstrained array type; all we have - are pointers to that type. - - The following fields are defined on array types and subtypes: - - Component_Type Component type of the array. - Number_Dimensions Number of dimensions (an int). - First_Index Type of first index. */ - - case E_String_Type: - case E_Array_Type: - { - const bool convention_fortran_p - = (Convention (gnat_entity) == Convention_Fortran); - const int ndim = Number_Dimensions (gnat_entity); - tree gnu_template_type; - tree gnu_ptr_template; - tree gnu_template_reference, gnu_template_fields, gnu_fat_type; - tree *gnu_index_types = XALLOCAVEC (tree, ndim); - tree *gnu_temp_fields = XALLOCAVEC (tree, ndim); - tree gnu_max_size = size_one_node, gnu_max_size_unit, tem, t; - Entity_Id gnat_index, gnat_name; - int index; - tree comp_type; - - /* Create the type for the component now, as it simplifies breaking - type reference loops. */ - comp_type - = gnat_to_gnu_component_type (gnat_entity, definition, debug_info_p); - if (present_gnu_tree (gnat_entity)) - { - /* As a side effect, the type may have been translated. */ - maybe_present = true; - break; - } - - /* We complete an existing dummy fat pointer type in place. This both - avoids further complex adjustments in update_pointer_to and yields - better debugging information in DWARF by leveraging the support for - incomplete declarations of "tagged" types in the DWARF back-end. */ - gnu_type = get_dummy_type (gnat_entity); - if (gnu_type && TYPE_POINTER_TO (gnu_type)) - { - gnu_fat_type = TYPE_MAIN_VARIANT (TYPE_POINTER_TO (gnu_type)); - TYPE_NAME (gnu_fat_type) = NULL_TREE; - /* Save the contents of the dummy type for update_pointer_to. */ - TYPE_POINTER_TO (gnu_type) = copy_type (gnu_fat_type); - gnu_ptr_template = - TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_fat_type))); - gnu_template_type = TREE_TYPE (gnu_ptr_template); - } - else - { - gnu_fat_type = make_node (RECORD_TYPE); - gnu_template_type = make_node (RECORD_TYPE); - gnu_ptr_template = build_pointer_type (gnu_template_type); - } - - /* Make a node for the array. If we are not defining the array - suppress expanding incomplete types. */ - gnu_type = make_node (UNCONSTRAINED_ARRAY_TYPE); - - if (!definition) - { - defer_incomplete_level++; - this_deferred = true; - } - - /* Build the fat pointer type. Use a "void *" object instead of - a pointer to the array type since we don't have the array type - yet (it will reference the fat pointer via the bounds). */ - tem - = create_field_decl (get_identifier ("P_ARRAY"), ptr_void_type_node, - gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); - DECL_CHAIN (tem) - = create_field_decl (get_identifier ("P_BOUNDS"), gnu_ptr_template, - gnu_fat_type, NULL_TREE, NULL_TREE, 0, 0); - - if (COMPLETE_TYPE_P (gnu_fat_type)) - { - /* We are going to lay it out again so reset the alias set. */ - alias_set_type alias_set = TYPE_ALIAS_SET (gnu_fat_type); - TYPE_ALIAS_SET (gnu_fat_type) = -1; - finish_fat_pointer_type (gnu_fat_type, tem); - TYPE_ALIAS_SET (gnu_fat_type) = alias_set; - for (t = gnu_fat_type; t; t = TYPE_NEXT_VARIANT (t)) - { - TYPE_FIELDS (t) = tem; - SET_TYPE_UNCONSTRAINED_ARRAY (t, gnu_type); - } - } - else - { - finish_fat_pointer_type (gnu_fat_type, tem); - SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type); - } - - /* Build a reference to the template from a PLACEHOLDER_EXPR that - is the fat pointer. This will be used to access the individual - fields once we build them. */ - tem = build3 (COMPONENT_REF, gnu_ptr_template, - build0 (PLACEHOLDER_EXPR, gnu_fat_type), - DECL_CHAIN (TYPE_FIELDS (gnu_fat_type)), NULL_TREE); - gnu_template_reference - = build_unary_op (INDIRECT_REF, gnu_template_type, tem); - TREE_READONLY (gnu_template_reference) = 1; - TREE_THIS_NOTRAP (gnu_template_reference) = 1; - - /* Now create the GCC type for each index and add the fields for that - index to the template. */ - for (index = (convention_fortran_p ? ndim - 1 : 0), - gnat_index = First_Index (gnat_entity); - 0 <= index && index < ndim; - index += (convention_fortran_p ? - 1 : 1), - gnat_index = Next_Index (gnat_index)) - { - char field_name[16]; - tree gnu_index_base_type - = get_unpadded_type (Base_Type (Etype (gnat_index))); - tree gnu_lb_field, gnu_hb_field, gnu_orig_min, gnu_orig_max; - tree gnu_min, gnu_max, gnu_high; - - /* Make the FIELD_DECLs for the low and high bounds of this - type and then make extractions of these fields from the - template. */ - sprintf (field_name, "LB%d", index); - gnu_lb_field = create_field_decl (get_identifier (field_name), - gnu_index_base_type, - gnu_template_type, NULL_TREE, - NULL_TREE, 0, 0); - Sloc_to_locus (Sloc (gnat_entity), - &DECL_SOURCE_LOCATION (gnu_lb_field)); - - field_name[0] = 'U'; - gnu_hb_field = create_field_decl (get_identifier (field_name), - gnu_index_base_type, - gnu_template_type, NULL_TREE, - NULL_TREE, 0, 0); - Sloc_to_locus (Sloc (gnat_entity), - &DECL_SOURCE_LOCATION (gnu_hb_field)); - - gnu_temp_fields[index] = chainon (gnu_lb_field, gnu_hb_field); - - /* We can't use build_component_ref here since the template type - isn't complete yet. */ - gnu_orig_min = build3 (COMPONENT_REF, gnu_index_base_type, - gnu_template_reference, gnu_lb_field, - NULL_TREE); - gnu_orig_max = build3 (COMPONENT_REF, gnu_index_base_type, - gnu_template_reference, gnu_hb_field, - NULL_TREE); - TREE_READONLY (gnu_orig_min) = TREE_READONLY (gnu_orig_max) = 1; - - gnu_min = convert (sizetype, gnu_orig_min); - gnu_max = convert (sizetype, gnu_orig_max); - - /* Compute the size of this dimension. See the E_Array_Subtype - case below for the rationale. */ - gnu_high - = build3 (COND_EXPR, sizetype, - build2 (GE_EXPR, boolean_type_node, - gnu_orig_max, gnu_orig_min), - gnu_max, - size_binop (MINUS_EXPR, gnu_min, size_one_node)); - - /* Make a range type with the new range in the Ada base type. - Then make an index type with the size range in sizetype. */ - gnu_index_types[index] - = create_index_type (gnu_min, gnu_high, - create_range_type (gnu_index_base_type, - gnu_orig_min, - gnu_orig_max), - gnat_entity); - - /* Update the maximum size of the array in elements. */ - if (gnu_max_size) - { - tree gnu_index_type = get_unpadded_type (Etype (gnat_index)); - tree gnu_min - = convert (sizetype, TYPE_MIN_VALUE (gnu_index_type)); - tree gnu_max - = convert (sizetype, TYPE_MAX_VALUE (gnu_index_type)); - tree gnu_this_max - = size_binop (MAX_EXPR, - size_binop (PLUS_EXPR, size_one_node, - size_binop (MINUS_EXPR, - gnu_max, gnu_min)), - size_zero_node); - - if (TREE_CODE (gnu_this_max) == INTEGER_CST - && TREE_OVERFLOW (gnu_this_max)) - gnu_max_size = NULL_TREE; - else - gnu_max_size - = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); - } - - TYPE_NAME (gnu_index_types[index]) - = create_concat_name (gnat_entity, field_name); - } - - /* Install all the fields into the template. */ - TYPE_NAME (gnu_template_type) - = create_concat_name (gnat_entity, "XUB"); - gnu_template_fields = NULL_TREE; - for (index = 0; index < ndim; index++) - gnu_template_fields - = chainon (gnu_template_fields, gnu_temp_fields[index]); - finish_record_type (gnu_template_type, gnu_template_fields, 0, - debug_info_p); - TYPE_READONLY (gnu_template_type) = 1; - - /* If Component_Size is not already specified, annotate it with the - size of the component. */ - if (Unknown_Component_Size (gnat_entity)) - Set_Component_Size (gnat_entity, - annotate_value (TYPE_SIZE (comp_type))); - - /* Compute the maximum size of the array in units and bits. */ - if (gnu_max_size) - { - gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size, - TYPE_SIZE_UNIT (comp_type)); - gnu_max_size = size_binop (MULT_EXPR, - convert (bitsizetype, gnu_max_size), - TYPE_SIZE (comp_type)); - } - else - gnu_max_size_unit = NULL_TREE; - - /* Now build the array type. */ - tem = comp_type; - for (index = ndim - 1; index >= 0; index--) - { - tem = build_nonshared_array_type (tem, gnu_index_types[index]); - if (Reverse_Storage_Order (gnat_entity)) - sorry ("non-default Scalar_Storage_Order"); - TYPE_MULTI_ARRAY_P (tem) = (index > 0); - if (array_type_has_nonaliased_component (tem, gnat_entity)) - TYPE_NONALIASED_COMPONENT (tem) = 1; - - /* If it is passed by reference, force BLKmode to ensure that - objects of this type will always be put in memory. */ - if (TYPE_MODE (tem) != BLKmode - && Is_By_Reference_Type (gnat_entity)) - SET_TYPE_MODE (tem, BLKmode); - } - - /* If an alignment is specified, use it if valid. But ignore it - for the original type of packed array types. If the alignment - was requested with an explicit alignment clause, state so. */ - if (No (Packed_Array_Type (gnat_entity)) - && Known_Alignment (gnat_entity)) - { - TYPE_ALIGN (tem) - = validate_alignment (Alignment (gnat_entity), gnat_entity, - TYPE_ALIGN (tem)); - if (Present (Alignment_Clause (gnat_entity))) - TYPE_USER_ALIGN (tem) = 1; - } - - TYPE_CONVENTION_FORTRAN_P (tem) = convention_fortran_p; - - /* Adjust the type of the pointer-to-array field of the fat pointer - and record the aliasing relationships if necessary. */ - TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem); - if (TYPE_ALIAS_SET_KNOWN_P (gnu_fat_type)) - record_component_aliases (gnu_fat_type); - - /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the - corresponding fat pointer. */ - TREE_TYPE (gnu_type) = gnu_fat_type; - TYPE_POINTER_TO (gnu_type) = gnu_fat_type; - TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type; - SET_TYPE_MODE (gnu_type, BLKmode); - TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem); - - /* If the maximum size doesn't overflow, use it. */ - if (gnu_max_size - && TREE_CODE (gnu_max_size) == INTEGER_CST - && !TREE_OVERFLOW (gnu_max_size) - && TREE_CODE (gnu_max_size_unit) == INTEGER_CST - && !TREE_OVERFLOW (gnu_max_size_unit)) - { - TYPE_SIZE (tem) = size_binop (MIN_EXPR, gnu_max_size, - TYPE_SIZE (tem)); - TYPE_SIZE_UNIT (tem) = size_binop (MIN_EXPR, gnu_max_size_unit, - TYPE_SIZE_UNIT (tem)); - } - - create_type_decl (create_concat_name (gnat_entity, "XUA"), - tem, NULL, !Comes_From_Source (gnat_entity), - debug_info_p, gnat_entity); - - /* Give the fat pointer type a name. If this is a packed type, tell - the debugger how to interpret the underlying bits. */ - if (Present (Packed_Array_Type (gnat_entity))) - gnat_name = Packed_Array_Type (gnat_entity); - else - gnat_name = gnat_entity; - create_type_decl (create_concat_name (gnat_name, "XUP"), - gnu_fat_type, NULL, !Comes_From_Source (gnat_entity), - debug_info_p, gnat_entity); - - /* Create the type to be designated by thin pointers: a record type for - the array and its template. We used to shift the fields to have the - template at a negative offset, but this was somewhat of a kludge; we - now shift thin pointer values explicitly but only those which have a - TYPE_UNCONSTRAINED_ARRAY attached to the designated RECORD_TYPE. */ - tem = build_unc_object_type (gnu_template_type, tem, - create_concat_name (gnat_name, "XUT"), - debug_info_p); - - SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type); - TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem; - } - break; - - case E_String_Subtype: - case E_Array_Subtype: - - /* This is the actual data type for array variables. Multidimensional - arrays are implemented as arrays of arrays. Note that arrays which - have sparse enumeration subtypes as index components create sparse - arrays, which is obviously space inefficient but so much easier to - code for now. - - Also note that the subtype never refers to the unconstrained array - type, which is somewhat at variance with Ada semantics. - - First check to see if this is simply a renaming of the array type. - If so, the result is the array type. */ - - gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); - if (!Is_Constrained (gnat_entity)) - ; - else - { - Entity_Id gnat_index, gnat_base_index; - const bool convention_fortran_p - = (Convention (gnat_entity) == Convention_Fortran); - const int ndim = Number_Dimensions (gnat_entity); - tree gnu_base_type = gnu_type; - tree *gnu_index_types = XALLOCAVEC (tree, ndim); - tree gnu_max_size = size_one_node, gnu_max_size_unit; - bool need_index_type_struct = false; - int index; - - /* First create the GCC type for each index and find out whether - special types are needed for debugging information. */ - for (index = (convention_fortran_p ? ndim - 1 : 0), - gnat_index = First_Index (gnat_entity), - gnat_base_index - = First_Index (Implementation_Base_Type (gnat_entity)); - 0 <= index && index < ndim; - index += (convention_fortran_p ? - 1 : 1), - gnat_index = Next_Index (gnat_index), - gnat_base_index = Next_Index (gnat_base_index)) - { - tree gnu_index_type = get_unpadded_type (Etype (gnat_index)); - tree gnu_orig_min = TYPE_MIN_VALUE (gnu_index_type); - tree gnu_orig_max = TYPE_MAX_VALUE (gnu_index_type); - tree gnu_min = convert (sizetype, gnu_orig_min); - tree gnu_max = convert (sizetype, gnu_orig_max); - tree gnu_base_index_type - = get_unpadded_type (Etype (gnat_base_index)); - tree gnu_base_orig_min = TYPE_MIN_VALUE (gnu_base_index_type); - tree gnu_base_orig_max = TYPE_MAX_VALUE (gnu_base_index_type); - tree gnu_high; - - /* See if the base array type is already flat. If it is, we - are probably compiling an ACATS test but it will cause the - code below to malfunction if we don't handle it specially. */ - if (TREE_CODE (gnu_base_orig_min) == INTEGER_CST - && TREE_CODE (gnu_base_orig_max) == INTEGER_CST - && tree_int_cst_lt (gnu_base_orig_max, gnu_base_orig_min)) - { - gnu_min = size_one_node; - gnu_max = size_zero_node; - gnu_high = gnu_max; - } - - /* Similarly, if one of the values overflows in sizetype and the - range is null, use 1..0 for the sizetype bounds. */ - else if (TREE_CODE (gnu_min) == INTEGER_CST - && TREE_CODE (gnu_max) == INTEGER_CST - && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max)) - && tree_int_cst_lt (gnu_orig_max, gnu_orig_min)) - { - gnu_min = size_one_node; - gnu_max = size_zero_node; - gnu_high = gnu_max; - } - - /* If the minimum and maximum values both overflow in sizetype, - but the difference in the original type does not overflow in - sizetype, ignore the overflow indication. */ - else if (TREE_CODE (gnu_min) == INTEGER_CST - && TREE_CODE (gnu_max) == INTEGER_CST - && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max) - && !TREE_OVERFLOW - (convert (sizetype, - fold_build2 (MINUS_EXPR, gnu_index_type, - gnu_orig_max, - gnu_orig_min)))) - { - TREE_OVERFLOW (gnu_min) = 0; - TREE_OVERFLOW (gnu_max) = 0; - gnu_high = gnu_max; - } - - /* Compute the size of this dimension in the general case. We - need to provide GCC with an upper bound to use but have to - deal with the "superflat" case. There are three ways to do - this. If we can prove that the array can never be superflat, - we can just use the high bound of the index type. */ - else if ((Nkind (gnat_index) == N_Range - && cannot_be_superflat_p (gnat_index)) - /* Packed Array Types are never superflat. */ - || Is_Packed_Array_Type (gnat_entity)) - gnu_high = gnu_max; - - /* Otherwise, if the high bound is constant but the low bound is - not, we use the expression (hb >= lb) ? lb : hb + 1 for the - lower bound. Note that the comparison must be done in the - original type to avoid any overflow during the conversion. */ - else if (TREE_CODE (gnu_max) == INTEGER_CST - && TREE_CODE (gnu_min) != INTEGER_CST) - { - gnu_high = gnu_max; - gnu_min - = build_cond_expr (sizetype, - build_binary_op (GE_EXPR, - boolean_type_node, - gnu_orig_max, - gnu_orig_min), - gnu_min, - int_const_binop (PLUS_EXPR, gnu_max, - size_one_node)); - } - - /* Finally we use (hb >= lb) ? hb : lb - 1 for the upper bound - in all the other cases. Note that, here as well as above, - the condition used in the comparison must be equivalent to - the condition (length != 0). This is relied upon in order - to optimize array comparisons in compare_arrays. Moreover - we use int_const_binop for the shift by 1 if the bound is - constant to avoid any unwanted overflow. */ - else - gnu_high - = build_cond_expr (sizetype, - build_binary_op (GE_EXPR, - boolean_type_node, - gnu_orig_max, - gnu_orig_min), - gnu_max, - TREE_CODE (gnu_min) == INTEGER_CST - ? int_const_binop (MINUS_EXPR, gnu_min, - size_one_node) - : size_binop (MINUS_EXPR, gnu_min, - size_one_node)); - - /* Reuse the index type for the range type. Then make an index - type with the size range in sizetype. */ - gnu_index_types[index] - = create_index_type (gnu_min, gnu_high, gnu_index_type, - gnat_entity); - - /* Update the maximum size of the array in elements. Here we - see if any constraint on the index type of the base type - can be used in the case of self-referential bound on the - index type of the subtype. We look for a non-"infinite" - and non-self-referential bound from any type involved and - handle each bound separately. */ - if (gnu_max_size) - { - tree gnu_base_min = convert (sizetype, gnu_base_orig_min); - tree gnu_base_max = convert (sizetype, gnu_base_orig_max); - tree gnu_base_index_base_type - = get_base_type (gnu_base_index_type); - tree gnu_base_base_min - = convert (sizetype, - TYPE_MIN_VALUE (gnu_base_index_base_type)); - tree gnu_base_base_max - = convert (sizetype, - TYPE_MAX_VALUE (gnu_base_index_base_type)); - - if (!CONTAINS_PLACEHOLDER_P (gnu_min) - || !(TREE_CODE (gnu_base_min) == INTEGER_CST - && !TREE_OVERFLOW (gnu_base_min))) - gnu_base_min = gnu_min; - - if (!CONTAINS_PLACEHOLDER_P (gnu_max) - || !(TREE_CODE (gnu_base_max) == INTEGER_CST - && !TREE_OVERFLOW (gnu_base_max))) - gnu_base_max = gnu_max; - - if ((TREE_CODE (gnu_base_min) == INTEGER_CST - && TREE_OVERFLOW (gnu_base_min)) - || operand_equal_p (gnu_base_min, gnu_base_base_min, 0) - || (TREE_CODE (gnu_base_max) == INTEGER_CST - && TREE_OVERFLOW (gnu_base_max)) - || operand_equal_p (gnu_base_max, gnu_base_base_max, 0)) - gnu_max_size = NULL_TREE; - else - { - tree gnu_this_max - = size_binop (MAX_EXPR, - size_binop (PLUS_EXPR, size_one_node, - size_binop (MINUS_EXPR, - gnu_base_max, - gnu_base_min)), - size_zero_node); - - if (TREE_CODE (gnu_this_max) == INTEGER_CST - && TREE_OVERFLOW (gnu_this_max)) - gnu_max_size = NULL_TREE; - else - gnu_max_size - = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); - } - } - - /* We need special types for debugging information to point to - the index types if they have variable bounds, are not integer - types, are biased or are wider than sizetype. */ - if (!integer_onep (gnu_orig_min) - || TREE_CODE (gnu_orig_max) != INTEGER_CST - || TREE_CODE (gnu_index_type) != INTEGER_TYPE - || (TREE_TYPE (gnu_index_type) - && TREE_CODE (TREE_TYPE (gnu_index_type)) - != INTEGER_TYPE) - || TYPE_BIASED_REPRESENTATION_P (gnu_index_type) - || compare_tree_int (rm_size (gnu_index_type), - TYPE_PRECISION (sizetype)) > 0) - need_index_type_struct = true; - } - - /* Then flatten: create the array of arrays. For an array type - used to implement a packed array, get the component type from - the original array type since the representation clauses that - can affect it are on the latter. */ - if (Is_Packed_Array_Type (gnat_entity) - && !Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) - { - gnu_type = gnat_to_gnu_type (Original_Array_Type (gnat_entity)); - for (index = ndim - 1; index >= 0; index--) - gnu_type = TREE_TYPE (gnu_type); - - /* One of the above calls might have caused us to be elaborated, - so don't blow up if so. */ - if (present_gnu_tree (gnat_entity)) - { - maybe_present = true; - break; - } - } - else - { - gnu_type = gnat_to_gnu_component_type (gnat_entity, definition, - debug_info_p); - - /* One of the above calls might have caused us to be elaborated, - so don't blow up if so. */ - if (present_gnu_tree (gnat_entity)) - { - maybe_present = true; - break; - } - } - - /* Compute the maximum size of the array in units and bits. */ - if (gnu_max_size) - { - gnu_max_size_unit = size_binop (MULT_EXPR, gnu_max_size, - TYPE_SIZE_UNIT (gnu_type)); - gnu_max_size = size_binop (MULT_EXPR, - convert (bitsizetype, gnu_max_size), - TYPE_SIZE (gnu_type)); - } - else - gnu_max_size_unit = NULL_TREE; - - /* Now build the array type. */ - for (index = ndim - 1; index >= 0; index --) - { - gnu_type = build_nonshared_array_type (gnu_type, - gnu_index_types[index]); - TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0); - if (array_type_has_nonaliased_component (gnu_type, gnat_entity)) - TYPE_NONALIASED_COMPONENT (gnu_type) = 1; - - /* See the E_Array_Type case for the rationale. */ - if (TYPE_MODE (gnu_type) != BLKmode - && Is_By_Reference_Type (gnat_entity)) - SET_TYPE_MODE (gnu_type, BLKmode); - } - - /* Attach the TYPE_STUB_DECL in case we have a parallel type. */ - TYPE_STUB_DECL (gnu_type) - = create_type_stub_decl (gnu_entity_name, gnu_type); - - /* If we are at file level and this is a multi-dimensional array, - we need to make a variable corresponding to the stride of the - inner dimensions. */ - if (global_bindings_p () && ndim > 1) - { - tree gnu_st_name = get_identifier ("ST"); - tree gnu_arr_type; - - for (gnu_arr_type = TREE_TYPE (gnu_type); - TREE_CODE (gnu_arr_type) == ARRAY_TYPE; - gnu_arr_type = TREE_TYPE (gnu_arr_type), - gnu_st_name = concat_name (gnu_st_name, "ST")) - { - tree eltype = TREE_TYPE (gnu_arr_type); - - TYPE_SIZE (gnu_arr_type) - = elaborate_expression_1 (TYPE_SIZE (gnu_arr_type), - gnat_entity, gnu_st_name, - definition, false); - - /* ??? For now, store the size as a multiple of the - alignment of the element type in bytes so that we - can see the alignment from the tree. */ - TYPE_SIZE_UNIT (gnu_arr_type) - = elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_arr_type), - gnat_entity, - concat_name (gnu_st_name, "A_U"), - definition, false, - TYPE_ALIGN (eltype)); - - /* ??? create_type_decl is not invoked on the inner types so - the MULT_EXPR node built above will never be marked. */ - MARK_VISITED (TYPE_SIZE_UNIT (gnu_arr_type)); - } - } - - /* If we need to write out a record type giving the names of the - bounds for debugging purposes, do it now and make the record - type a parallel type. This is not needed for a packed array - since the bounds are conveyed by the original array type. */ - if (need_index_type_struct - && debug_info_p - && !Is_Packed_Array_Type (gnat_entity)) - { - tree gnu_bound_rec = make_node (RECORD_TYPE); - tree gnu_field_list = NULL_TREE; - tree gnu_field; - - TYPE_NAME (gnu_bound_rec) - = create_concat_name (gnat_entity, "XA"); - - for (index = ndim - 1; index >= 0; index--) - { - tree gnu_index = TYPE_INDEX_TYPE (gnu_index_types[index]); - tree gnu_index_name = TYPE_NAME (gnu_index); - - if (TREE_CODE (gnu_index_name) == TYPE_DECL) - gnu_index_name = DECL_NAME (gnu_index_name); - - /* Make sure to reference the types themselves, and not just - their names, as the debugger may fall back on them. */ - gnu_field = create_field_decl (gnu_index_name, gnu_index, - gnu_bound_rec, NULL_TREE, - NULL_TREE, 0, 0); - DECL_CHAIN (gnu_field) = gnu_field_list; - gnu_field_list = gnu_field; - } - - finish_record_type (gnu_bound_rec, gnu_field_list, 0, true); - add_parallel_type (gnu_type, gnu_bound_rec); - } - - /* If this is a packed array type, make the original array type a - parallel type. Otherwise, do it for the base array type if it - isn't artificial to make sure it is kept in the debug info. */ - if (debug_info_p) - { - if (Is_Packed_Array_Type (gnat_entity) - && present_gnu_tree (Original_Array_Type (gnat_entity))) - add_parallel_type (gnu_type, - gnat_to_gnu_type - (Original_Array_Type (gnat_entity))); - else - { - tree gnu_base_decl - = gnat_to_gnu_entity (Etype (gnat_entity), NULL_TREE, 0); - if (!DECL_ARTIFICIAL (gnu_base_decl)) - add_parallel_type (gnu_type, - TREE_TYPE (TREE_TYPE (gnu_base_decl))); - } - } - - TYPE_CONVENTION_FORTRAN_P (gnu_type) = convention_fortran_p; - TYPE_PACKED_ARRAY_TYPE_P (gnu_type) - = (Is_Packed_Array_Type (gnat_entity) - && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))); - - /* If the size is self-referential and the maximum size doesn't - overflow, use it. */ - if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) - && gnu_max_size - && !(TREE_CODE (gnu_max_size) == INTEGER_CST - && TREE_OVERFLOW (gnu_max_size)) - && !(TREE_CODE (gnu_max_size_unit) == INTEGER_CST - && TREE_OVERFLOW (gnu_max_size_unit))) - { - TYPE_SIZE (gnu_type) = size_binop (MIN_EXPR, gnu_max_size, - TYPE_SIZE (gnu_type)); - TYPE_SIZE_UNIT (gnu_type) - = size_binop (MIN_EXPR, gnu_max_size_unit, - TYPE_SIZE_UNIT (gnu_type)); - } - - /* Set our alias set to that of our base type. This gives all - array subtypes the same alias set. */ - relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY); - - /* If this is a packed type, make this type the same as the packed - array type, but do some adjusting in the type first. */ - if (Present (Packed_Array_Type (gnat_entity))) - { - Entity_Id gnat_index; - tree gnu_inner; - - /* First finish the type we had been making so that we output - debugging information for it. */ - if (Treat_As_Volatile (gnat_entity)) - gnu_type - = build_qualified_type (gnu_type, - TYPE_QUALS (gnu_type) - | TYPE_QUAL_VOLATILE); - - /* Make it artificial only if the base type was artificial too. - That's sort of "morally" true and will make it possible for - the debugger to look it up by name in DWARF, which is needed - in order to decode the packed array type. */ - gnu_decl - = create_type_decl (gnu_entity_name, gnu_type, attr_list, - !Comes_From_Source (Etype (gnat_entity)) - && !Comes_From_Source (gnat_entity), - debug_info_p, gnat_entity); - - /* Save it as our equivalent in case the call below elaborates - this type again. */ - save_gnu_tree (gnat_entity, gnu_decl, false); - - gnu_decl = gnat_to_gnu_entity (Packed_Array_Type (gnat_entity), - NULL_TREE, 0); - this_made_decl = true; - gnu_type = TREE_TYPE (gnu_decl); - save_gnu_tree (gnat_entity, NULL_TREE, false); - - gnu_inner = gnu_type; - while (TREE_CODE (gnu_inner) == RECORD_TYPE - && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner) - || TYPE_PADDING_P (gnu_inner))) - gnu_inner = TREE_TYPE (TYPE_FIELDS (gnu_inner)); - - /* We need to attach the index type to the type we just made so - that the actual bounds can later be put into a template. */ - if ((TREE_CODE (gnu_inner) == ARRAY_TYPE - && !TYPE_ACTUAL_BOUNDS (gnu_inner)) - || (TREE_CODE (gnu_inner) == INTEGER_TYPE - && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner))) - { - if (TREE_CODE (gnu_inner) == INTEGER_TYPE) - { - /* The TYPE_ACTUAL_BOUNDS field is overloaded with the - TYPE_MODULUS for modular types so we make an extra - subtype if necessary. */ - if (TYPE_MODULAR_P (gnu_inner)) - { - tree gnu_subtype - = make_unsigned_type (TYPE_PRECISION (gnu_inner)); - TREE_TYPE (gnu_subtype) = gnu_inner; - TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; - SET_TYPE_RM_MIN_VALUE (gnu_subtype, - TYPE_MIN_VALUE (gnu_inner)); - SET_TYPE_RM_MAX_VALUE (gnu_subtype, - TYPE_MAX_VALUE (gnu_inner)); - gnu_inner = gnu_subtype; - } - - TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner) = 1; - -#ifdef ENABLE_CHECKING - /* Check for other cases of overloading. */ - gcc_assert (!TYPE_ACTUAL_BOUNDS (gnu_inner)); -#endif - } - - for (gnat_index = First_Index (gnat_entity); - Present (gnat_index); - gnat_index = Next_Index (gnat_index)) - SET_TYPE_ACTUAL_BOUNDS - (gnu_inner, - tree_cons (NULL_TREE, - get_unpadded_type (Etype (gnat_index)), - TYPE_ACTUAL_BOUNDS (gnu_inner))); - - if (Convention (gnat_entity) != Convention_Fortran) - SET_TYPE_ACTUAL_BOUNDS - (gnu_inner, nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner))); - - if (TREE_CODE (gnu_type) == RECORD_TYPE - && TYPE_JUSTIFIED_MODULAR_P (gnu_type)) - TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner; - } - } - - else - /* Abort if packed array with no Packed_Array_Type field set. */ - gcc_assert (!Is_Packed (gnat_entity)); - } - break; - - case E_String_Literal_Subtype: - /* Create the type for a string literal. */ - { - Entity_Id gnat_full_type - = (IN (Ekind (Etype (gnat_entity)), Private_Kind) - && Present (Full_View (Etype (gnat_entity))) - ? Full_View (Etype (gnat_entity)) : Etype (gnat_entity)); - tree gnu_string_type = get_unpadded_type (gnat_full_type); - tree gnu_string_array_type - = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_string_type)))); - tree gnu_string_index_type - = get_base_type (TREE_TYPE (TYPE_INDEX_TYPE - (TYPE_DOMAIN (gnu_string_array_type)))); - tree gnu_lower_bound - = convert (gnu_string_index_type, - gnat_to_gnu (String_Literal_Low_Bound (gnat_entity))); - tree gnu_length - = UI_To_gnu (String_Literal_Length (gnat_entity), - gnu_string_index_type); - tree gnu_upper_bound - = build_binary_op (PLUS_EXPR, gnu_string_index_type, - gnu_lower_bound, - int_const_binop (MINUS_EXPR, gnu_length, - integer_one_node)); - tree gnu_index_type - = create_index_type (convert (sizetype, gnu_lower_bound), - convert (sizetype, gnu_upper_bound), - create_range_type (gnu_string_index_type, - gnu_lower_bound, - gnu_upper_bound), - gnat_entity); - - gnu_type - = build_nonshared_array_type (gnat_to_gnu_type - (Component_Type (gnat_entity)), - gnu_index_type); - if (array_type_has_nonaliased_component (gnu_type, gnat_entity)) - TYPE_NONALIASED_COMPONENT (gnu_type) = 1; - relate_alias_sets (gnu_type, gnu_string_type, ALIAS_SET_COPY); - } - break; - - /* Record Types and Subtypes - - The following fields are defined on record types: - - Has_Discriminants True if the record has discriminants - First_Discriminant Points to head of list of discriminants - First_Entity Points to head of list of fields - Is_Tagged_Type True if the record is tagged - - Implementation of Ada records and discriminated records: - - A record type definition is transformed into the equivalent of a C - struct definition. The fields that are the discriminants which are - found in the Full_Type_Declaration node and the elements of the - Component_List found in the Record_Type_Definition node. The - Component_List can be a recursive structure since each Variant of - the Variant_Part of the Component_List has a Component_List. - - Processing of a record type definition comprises starting the list of - field declarations here from the discriminants and the calling the - function components_to_record to add the rest of the fields from the - component list and return the gnu type node. The function - components_to_record will call itself recursively as it traverses - the tree. */ - - case E_Record_Type: - if (Has_Complex_Representation (gnat_entity)) - { - gnu_type - = build_complex_type - (get_unpadded_type - (Etype (Defining_Entity - (First (Component_Items - (Component_List - (Type_Definition - (Declaration_Node (gnat_entity))))))))); - - break; - } - - { - Node_Id full_definition = Declaration_Node (gnat_entity); - Node_Id record_definition = Type_Definition (full_definition); - Entity_Id gnat_field; - tree gnu_field, gnu_field_list = NULL_TREE, gnu_get_parent; - /* Set PACKED in keeping with gnat_to_gnu_field. */ - int packed - = Is_Packed (gnat_entity) - ? 1 - : Component_Alignment (gnat_entity) == Calign_Storage_Unit - ? -1 - : (Known_Alignment (gnat_entity) - || (Strict_Alignment (gnat_entity) - && Known_RM_Size (gnat_entity))) - ? -2 - : 0; - bool has_discr = Has_Discriminants (gnat_entity); - bool has_rep = Has_Specified_Layout (gnat_entity); - bool all_rep = has_rep; - bool is_extension - = (Is_Tagged_Type (gnat_entity) - && Nkind (record_definition) == N_Derived_Type_Definition); - bool is_unchecked_union = Is_Unchecked_Union (gnat_entity); - - /* See if all fields have a rep clause. Stop when we find one - that doesn't. */ - if (all_rep) - for (gnat_field = First_Entity (gnat_entity); - Present (gnat_field); - gnat_field = Next_Entity (gnat_field)) - if ((Ekind (gnat_field) == E_Component - || Ekind (gnat_field) == E_Discriminant) - && No (Component_Clause (gnat_field))) - { - all_rep = false; - break; - } - - /* If this is a record extension, go a level further to find the - record definition. Also, verify we have a Parent_Subtype. */ - if (is_extension) - { - if (!type_annotate_only - || Present (Record_Extension_Part (record_definition))) - record_definition = Record_Extension_Part (record_definition); - - gcc_assert (type_annotate_only - || Present (Parent_Subtype (gnat_entity))); - } - - /* Make a node for the record. If we are not defining the record, - suppress expanding incomplete types. */ - gnu_type = make_node (tree_code_for_record_type (gnat_entity)); - TYPE_NAME (gnu_type) = gnu_entity_name; - TYPE_PACKED (gnu_type) = (packed != 0) || has_rep; - if (Reverse_Storage_Order (gnat_entity)) - sorry ("non-default Scalar_Storage_Order"); - - if (!definition) - { - defer_incomplete_level++; - this_deferred = true; - } - - /* If both a size and rep clause was specified, put the size in - the record type now so that it can get the proper mode. */ - if (has_rep && Known_RM_Size (gnat_entity)) - TYPE_SIZE (gnu_type) - = UI_To_gnu (RM_Size (gnat_entity), bitsizetype); - - /* Always set the alignment here so that it can be used to - set the mode, if it is making the alignment stricter. If - it is invalid, it will be checked again below. If this is to - be Atomic, choose a default alignment of a word unless we know - the size and it's smaller. */ - if (Known_Alignment (gnat_entity)) - TYPE_ALIGN (gnu_type) - = validate_alignment (Alignment (gnat_entity), gnat_entity, 0); - else if (Is_Atomic (gnat_entity) && Known_Esize (gnat_entity)) - { - unsigned int size = UI_To_Int (Esize (gnat_entity)); - TYPE_ALIGN (gnu_type) - = size >= BITS_PER_WORD ? BITS_PER_WORD : ceil_pow2 (size); - } - /* If a type needs strict alignment, the minimum size will be the - type size instead of the RM size (see validate_size). Cap the - alignment, lest it causes this type size to become too large. */ - else if (Strict_Alignment (gnat_entity) && Known_RM_Size (gnat_entity)) - { - unsigned int raw_size = UI_To_Int (RM_Size (gnat_entity)); - unsigned int raw_align = raw_size & -raw_size; - if (raw_align < BIGGEST_ALIGNMENT) - TYPE_ALIGN (gnu_type) = raw_align; - } - else - TYPE_ALIGN (gnu_type) = 0; - - /* If we have a Parent_Subtype, make a field for the parent. If - this record has rep clauses, force the position to zero. */ - if (Present (Parent_Subtype (gnat_entity))) - { - Entity_Id gnat_parent = Parent_Subtype (gnat_entity); - tree gnu_dummy_parent_type = make_node (RECORD_TYPE); - tree gnu_parent; - - /* A major complexity here is that the parent subtype will - reference our discriminants in its Stored_Constraint list. - But those must reference the parent component of this record - which is precisely of the parent subtype we have not built yet! - To break the circle we first build a dummy COMPONENT_REF which - represents the "get to the parent" operation and initialize - each of those discriminants to a COMPONENT_REF of the above - dummy parent referencing the corresponding discriminant of the - base type of the parent subtype. */ - gnu_get_parent = build3 (COMPONENT_REF, gnu_dummy_parent_type, - build0 (PLACEHOLDER_EXPR, gnu_type), - build_decl (input_location, - FIELD_DECL, NULL_TREE, - gnu_dummy_parent_type), - NULL_TREE); - - if (has_discr) - for (gnat_field = First_Stored_Discriminant (gnat_entity); - Present (gnat_field); - gnat_field = Next_Stored_Discriminant (gnat_field)) - if (Present (Corresponding_Discriminant (gnat_field))) - { - tree gnu_field - = gnat_to_gnu_field_decl (Corresponding_Discriminant - (gnat_field)); - save_gnu_tree - (gnat_field, - build3 (COMPONENT_REF, TREE_TYPE (gnu_field), - gnu_get_parent, gnu_field, NULL_TREE), - true); - } - - /* Then we build the parent subtype. If it has discriminants but - the type itself has unknown discriminants, this means that it - doesn't contain information about how the discriminants are - derived from those of the ancestor type, so it cannot be used - directly. Instead it is built by cloning the parent subtype - of the underlying record view of the type, for which the above - derivation of discriminants has been made explicit. */ - if (Has_Discriminants (gnat_parent) - && Has_Unknown_Discriminants (gnat_entity)) - { - Entity_Id gnat_uview = Underlying_Record_View (gnat_entity); - - /* If we are defining the type, the underlying record - view must already have been elaborated at this point. - Otherwise do it now as its parent subtype cannot be - technically elaborated on its own. */ - if (definition) - gcc_assert (present_gnu_tree (gnat_uview)); - else - gnat_to_gnu_entity (gnat_uview, NULL_TREE, 0); - - gnu_parent = gnat_to_gnu_type (Parent_Subtype (gnat_uview)); - - /* Substitute the "get to the parent" of the type for that - of its underlying record view in the cloned type. */ - for (gnat_field = First_Stored_Discriminant (gnat_uview); - Present (gnat_field); - gnat_field = Next_Stored_Discriminant (gnat_field)) - if (Present (Corresponding_Discriminant (gnat_field))) - { - tree gnu_field = gnat_to_gnu_field_decl (gnat_field); - tree gnu_ref - = build3 (COMPONENT_REF, TREE_TYPE (gnu_field), - gnu_get_parent, gnu_field, NULL_TREE); - gnu_parent - = substitute_in_type (gnu_parent, gnu_field, gnu_ref); - } - } - else - gnu_parent = gnat_to_gnu_type (gnat_parent); - - /* Finally we fix up both kinds of twisted COMPONENT_REF we have - initially built. The discriminants must reference the fields - of the parent subtype and not those of its base type for the - placeholder machinery to properly work. */ - if (has_discr) - { - /* The actual parent subtype is the full view. */ - if (IN (Ekind (gnat_parent), Private_Kind)) - { - if (Present (Full_View (gnat_parent))) - gnat_parent = Full_View (gnat_parent); - else - gnat_parent = Underlying_Full_View (gnat_parent); - } - - for (gnat_field = First_Stored_Discriminant (gnat_entity); - Present (gnat_field); - gnat_field = Next_Stored_Discriminant (gnat_field)) - if (Present (Corresponding_Discriminant (gnat_field))) - { - Entity_Id field = Empty; - for (field = First_Stored_Discriminant (gnat_parent); - Present (field); - field = Next_Stored_Discriminant (field)) - if (same_discriminant_p (gnat_field, field)) - break; - gcc_assert (Present (field)); - TREE_OPERAND (get_gnu_tree (gnat_field), 1) - = gnat_to_gnu_field_decl (field); - } - } - - /* The "get to the parent" COMPONENT_REF must be given its - proper type... */ - TREE_TYPE (gnu_get_parent) = gnu_parent; - - /* ...and reference the _Parent field of this record. */ - gnu_field - = create_field_decl (parent_name_id, - gnu_parent, gnu_type, - has_rep - ? TYPE_SIZE (gnu_parent) : NULL_TREE, - has_rep - ? bitsize_zero_node : NULL_TREE, - 0, 1); - DECL_INTERNAL_P (gnu_field) = 1; - TREE_OPERAND (gnu_get_parent, 1) = gnu_field; - TYPE_FIELDS (gnu_type) = gnu_field; - } - - /* Make the fields for the discriminants and put them into the record - unless it's an Unchecked_Union. */ - if (has_discr) - for (gnat_field = First_Stored_Discriminant (gnat_entity); - Present (gnat_field); - gnat_field = Next_Stored_Discriminant (gnat_field)) - { - /* If this is a record extension and this discriminant is the - renaming of another discriminant, we've handled it above. */ - if (Present (Parent_Subtype (gnat_entity)) - && Present (Corresponding_Discriminant (gnat_field))) - continue; - - gnu_field - = gnat_to_gnu_field (gnat_field, gnu_type, packed, definition, - debug_info_p); - - /* Make an expression using a PLACEHOLDER_EXPR from the - FIELD_DECL node just created and link that with the - corresponding GNAT defining identifier. */ - save_gnu_tree (gnat_field, - build3 (COMPONENT_REF, TREE_TYPE (gnu_field), - build0 (PLACEHOLDER_EXPR, gnu_type), - gnu_field, NULL_TREE), - true); - - if (!is_unchecked_union) - { - DECL_CHAIN (gnu_field) = gnu_field_list; - gnu_field_list = gnu_field; - } - } - - /* Add the fields into the record type and finish it up. */ - components_to_record (gnu_type, Component_List (record_definition), - gnu_field_list, packed, definition, false, - all_rep, is_unchecked_union, - !Comes_From_Source (gnat_entity), debug_info_p, - false, OK_To_Reorder_Components (gnat_entity), - all_rep ? NULL_TREE : bitsize_zero_node, NULL); - - /* If it is passed by reference, force BLKmode to ensure that objects - of this type will always be put in memory. */ - if (TYPE_MODE (gnu_type) != BLKmode - && Is_By_Reference_Type (gnat_entity)) - SET_TYPE_MODE (gnu_type, BLKmode); - - /* We used to remove the associations of the discriminants and _Parent - for validity checking but we may need them if there's a Freeze_Node - for a subtype used in this record. */ - TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity); - - /* Fill in locations of fields. */ - annotate_rep (gnat_entity, gnu_type); - - /* If there are any entities in the chain corresponding to components - that we did not elaborate, ensure we elaborate their types if they - are Itypes. */ - for (gnat_temp = First_Entity (gnat_entity); - Present (gnat_temp); - gnat_temp = Next_Entity (gnat_temp)) - if ((Ekind (gnat_temp) == E_Component - || Ekind (gnat_temp) == E_Discriminant) - && Is_Itype (Etype (gnat_temp)) - && !present_gnu_tree (gnat_temp)) - gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0); - - /* If this is a record type associated with an exception definition, - equate its fields to those of the standard exception type. This - will make it possible to convert between them. */ - if (gnu_entity_name == exception_data_name_id) - { - tree gnu_std_field; - for (gnu_field = TYPE_FIELDS (gnu_type), - gnu_std_field = TYPE_FIELDS (except_type_node); - gnu_field; - gnu_field = DECL_CHAIN (gnu_field), - gnu_std_field = DECL_CHAIN (gnu_std_field)) - SET_DECL_ORIGINAL_FIELD_TO_FIELD (gnu_field, gnu_std_field); - gcc_assert (!gnu_std_field); - } - } - break; - - case E_Class_Wide_Subtype: - /* If an equivalent type is present, that is what we should use. - Otherwise, fall through to handle this like a record subtype - since it may have constraints. */ - if (gnat_equiv_type != gnat_entity) - { - gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0); - maybe_present = true; - break; - } - - /* ... fall through ... */ - - case E_Record_Subtype: - /* If Cloned_Subtype is Present it means this record subtype has - identical layout to that type or subtype and we should use - that GCC type for this one. The front end guarantees that - the component list is shared. */ - if (Present (Cloned_Subtype (gnat_entity))) - { - gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity), - NULL_TREE, 0); - maybe_present = true; - break; - } - - /* Otherwise, first ensure the base type is elaborated. Then, if we are - changing the type, make a new type with each field having the type of - the field in the new subtype but the position computed by transforming - every discriminant reference according to the constraints. We don't - see any difference between private and non-private type here since - derivations from types should have been deferred until the completion - of the private type. */ - else - { - Entity_Id gnat_base_type = Implementation_Base_Type (gnat_entity); - tree gnu_base_type; - - if (!definition) - { - defer_incomplete_level++; - this_deferred = true; - } - - gnu_base_type = gnat_to_gnu_type (gnat_base_type); - - if (present_gnu_tree (gnat_entity)) - { - maybe_present = true; - break; - } - - /* If this is a record subtype associated with a dispatch table, - strip the suffix. This is necessary to make sure 2 different - subtypes associated with the imported and exported views of a - dispatch table are properly merged in LTO mode. */ - if (Is_Dispatch_Table_Entity (gnat_entity)) - { - char *p; - Get_Encoded_Name (gnat_entity); - p = strchr (Name_Buffer, '_'); - gcc_assert (p); - strcpy (p+2, "dtS"); - gnu_entity_name = get_identifier (Name_Buffer); - } - - /* When the subtype has discriminants and these discriminants affect - the initial shape it has inherited, factor them in. But for an - Unchecked_Union (it must be an Itype), just return the type. - We can't just test Is_Constrained because private subtypes without - discriminants of types with discriminants with default expressions - are Is_Constrained but aren't constrained! */ - if (IN (Ekind (gnat_base_type), Record_Kind) - && !Is_Unchecked_Union (gnat_base_type) - && !Is_For_Access_Subtype (gnat_entity) - && Has_Discriminants (gnat_entity) - && Is_Constrained (gnat_entity) - && Stored_Constraint (gnat_entity) != No_Elist) - { - vec<subst_pair> gnu_subst_list - = build_subst_list (gnat_entity, gnat_base_type, definition); - tree gnu_unpad_base_type, gnu_rep_part, gnu_variant_part, t; - tree gnu_pos_list, gnu_field_list = NULL_TREE; - bool selected_variant = false; - Entity_Id gnat_field; - vec<variant_desc> gnu_variant_list; - - gnu_type = make_node (RECORD_TYPE); - TYPE_NAME (gnu_type) = gnu_entity_name; - TYPE_PACKED (gnu_type) = TYPE_PACKED (gnu_base_type); - - /* Set the size, alignment and alias set of the new type to - match that of the old one, doing required substitutions. */ - copy_and_substitute_in_size (gnu_type, gnu_base_type, - gnu_subst_list); - - if (TYPE_IS_PADDING_P (gnu_base_type)) - gnu_unpad_base_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type)); - else - gnu_unpad_base_type = gnu_base_type; - - /* Look for a variant part in the base type. */ - gnu_variant_part = get_variant_part (gnu_unpad_base_type); - - /* If there is a variant part, we must compute whether the - constraints statically select a particular variant. If - so, we simply drop the qualified union and flatten the - list of fields. Otherwise we'll build a new qualified - union for the variants that are still relevant. */ - if (gnu_variant_part) - { - variant_desc *v; - unsigned int i; - - gnu_variant_list - = build_variant_list (TREE_TYPE (gnu_variant_part), - gnu_subst_list, - vNULL); - - /* If all the qualifiers are unconditionally true, the - innermost variant is statically selected. */ - selected_variant = true; - FOR_EACH_VEC_ELT (gnu_variant_list, i, v) - if (!integer_onep (v->qual)) - { - selected_variant = false; - break; - } - - /* Otherwise, create the new variants. */ - if (!selected_variant) - FOR_EACH_VEC_ELT (gnu_variant_list, i, v) - { - tree old_variant = v->type; - tree new_variant = make_node (RECORD_TYPE); - tree suffix - = concat_name (DECL_NAME (gnu_variant_part), - IDENTIFIER_POINTER - (DECL_NAME (v->field))); - TYPE_NAME (new_variant) - = concat_name (TYPE_NAME (gnu_type), - IDENTIFIER_POINTER (suffix)); - copy_and_substitute_in_size (new_variant, old_variant, - gnu_subst_list); - v->new_type = new_variant; - } - } - else - { - gnu_variant_list.create (0); - selected_variant = false; - } - - gnu_pos_list - = build_position_list (gnu_unpad_base_type, - gnu_variant_list.exists () - && !selected_variant, - size_zero_node, bitsize_zero_node, - BIGGEST_ALIGNMENT, NULL_TREE); - - for (gnat_field = First_Entity (gnat_entity); - Present (gnat_field); - gnat_field = Next_Entity (gnat_field)) - if ((Ekind (gnat_field) == E_Component - || Ekind (gnat_field) == E_Discriminant) - && !(Present (Corresponding_Discriminant (gnat_field)) - && Is_Tagged_Type (gnat_base_type)) - && Underlying_Type (Scope (Original_Record_Component - (gnat_field))) - == gnat_base_type) - { - Name_Id gnat_name = Chars (gnat_field); - Entity_Id gnat_old_field - = Original_Record_Component (gnat_field); - tree gnu_old_field - = gnat_to_gnu_field_decl (gnat_old_field); - tree gnu_context = DECL_CONTEXT (gnu_old_field); - tree gnu_field, gnu_field_type, gnu_size; - tree gnu_cont_type, gnu_last = NULL_TREE; - - /* If the type is the same, retrieve the GCC type from the - old field to take into account possible adjustments. */ - if (Etype (gnat_field) == Etype (gnat_old_field)) - gnu_field_type = TREE_TYPE (gnu_old_field); - else - gnu_field_type = gnat_to_gnu_type (Etype (gnat_field)); - - /* If there was a component clause, the field types must be - the same for the type and subtype, so copy the data from - the old field to avoid recomputation here. Also if the - field is justified modular and the optimization in - gnat_to_gnu_field was applied. */ - if (Present (Component_Clause (gnat_old_field)) - || (TREE_CODE (gnu_field_type) == RECORD_TYPE - && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type) - && TREE_TYPE (TYPE_FIELDS (gnu_field_type)) - == TREE_TYPE (gnu_old_field))) - { - gnu_size = DECL_SIZE (gnu_old_field); - gnu_field_type = TREE_TYPE (gnu_old_field); - } - - /* If the old field was packed and of constant size, we - have to get the old size here, as it might differ from - what the Etype conveys and the latter might overlap - onto the following field. Try to arrange the type for - possible better packing along the way. */ - else if (DECL_PACKED (gnu_old_field) - && TREE_CODE (DECL_SIZE (gnu_old_field)) - == INTEGER_CST) - { - gnu_size = DECL_SIZE (gnu_old_field); - if (RECORD_OR_UNION_TYPE_P (gnu_field_type) - && !TYPE_FAT_POINTER_P (gnu_field_type) - && host_integerp (TYPE_SIZE (gnu_field_type), 1)) - gnu_field_type - = make_packable_type (gnu_field_type, true); - } - - else - gnu_size = TYPE_SIZE (gnu_field_type); - - /* If the context of the old field is the base type or its - REP part (if any), put the field directly in the new - type; otherwise look up the context in the variant list - and put the field either in the new type if there is a - selected variant or in one of the new variants. */ - if (gnu_context == gnu_unpad_base_type - || ((gnu_rep_part = get_rep_part (gnu_unpad_base_type)) - && gnu_context == TREE_TYPE (gnu_rep_part))) - gnu_cont_type = gnu_type; - else - { - variant_desc *v; - unsigned int i; - - t = NULL_TREE; - FOR_EACH_VEC_ELT (gnu_variant_list, i, v) - if (gnu_context == v->type - || ((gnu_rep_part = get_rep_part (v->type)) - && gnu_context == TREE_TYPE (gnu_rep_part))) - { - t = v->type; - break; - } - if (t) - { - if (selected_variant) - gnu_cont_type = gnu_type; - else - gnu_cont_type = v->new_type; - } - else - /* The front-end may pass us "ghost" components if - it fails to recognize that a constrained subtype - is statically constrained. Discard them. */ - continue; - } - - /* Now create the new field modeled on the old one. */ - gnu_field - = create_field_decl_from (gnu_old_field, gnu_field_type, - gnu_cont_type, gnu_size, - gnu_pos_list, gnu_subst_list); - - /* Put it in one of the new variants directly. */ - if (gnu_cont_type != gnu_type) - { - DECL_CHAIN (gnu_field) = TYPE_FIELDS (gnu_cont_type); - TYPE_FIELDS (gnu_cont_type) = gnu_field; - } - - /* To match the layout crafted in components_to_record, - if this is the _Tag or _Parent field, put it before - any other fields. */ - else if (gnat_name == Name_uTag - || gnat_name == Name_uParent) - gnu_field_list = chainon (gnu_field_list, gnu_field); - - /* Similarly, if this is the _Controller field, put - it before the other fields except for the _Tag or - _Parent field. */ - else if (gnat_name == Name_uController && gnu_last) - { - DECL_CHAIN (gnu_field) = DECL_CHAIN (gnu_last); - DECL_CHAIN (gnu_last) = gnu_field; - } - - /* Otherwise, if this is a regular field, put it after - the other fields. */ - else - { - DECL_CHAIN (gnu_field) = gnu_field_list; - gnu_field_list = gnu_field; - if (!gnu_last) - gnu_last = gnu_field; - } - - save_gnu_tree (gnat_field, gnu_field, false); - } - - /* If there is a variant list and no selected variant, we need - to create the nest of variant parts from the old nest. */ - if (gnu_variant_list.exists () && !selected_variant) - { - tree new_variant_part - = create_variant_part_from (gnu_variant_part, - gnu_variant_list, gnu_type, - gnu_pos_list, gnu_subst_list); - DECL_CHAIN (new_variant_part) = gnu_field_list; - gnu_field_list = new_variant_part; - } - - /* Now go through the entities again looking for Itypes that - we have not elaborated but should (e.g., Etypes of fields - that have Original_Components). */ - for (gnat_field = First_Entity (gnat_entity); - Present (gnat_field); gnat_field = Next_Entity (gnat_field)) - if ((Ekind (gnat_field) == E_Discriminant - || Ekind (gnat_field) == E_Component) - && !present_gnu_tree (Etype (gnat_field))) - gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0); - - /* Do not emit debug info for the type yet since we're going to - modify it below. */ - finish_record_type (gnu_type, nreverse (gnu_field_list), 2, - false); - compute_record_mode (gnu_type); - - /* See the E_Record_Type case for the rationale. */ - if (TYPE_MODE (gnu_type) != BLKmode - && Is_By_Reference_Type (gnat_entity)) - SET_TYPE_MODE (gnu_type, BLKmode); - - TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity); - - /* Fill in locations of fields. */ - annotate_rep (gnat_entity, gnu_type); - - /* If debugging information is being written for the type, write - a record that shows what we are a subtype of and also make a - variable that indicates our size, if still variable. */ - if (debug_info_p) - { - tree gnu_subtype_marker = make_node (RECORD_TYPE); - tree gnu_unpad_base_name = TYPE_NAME (gnu_unpad_base_type); - tree gnu_size_unit = TYPE_SIZE_UNIT (gnu_type); - - if (TREE_CODE (gnu_unpad_base_name) == TYPE_DECL) - gnu_unpad_base_name = DECL_NAME (gnu_unpad_base_name); - - TYPE_NAME (gnu_subtype_marker) - = create_concat_name (gnat_entity, "XVS"); - finish_record_type (gnu_subtype_marker, - create_field_decl (gnu_unpad_base_name, - build_reference_type - (gnu_unpad_base_type), - gnu_subtype_marker, - NULL_TREE, NULL_TREE, - 0, 0), - 0, true); - - add_parallel_type (gnu_type, gnu_subtype_marker); - - if (definition - && TREE_CODE (gnu_size_unit) != INTEGER_CST - && !CONTAINS_PLACEHOLDER_P (gnu_size_unit)) - TYPE_SIZE_UNIT (gnu_subtype_marker) - = create_var_decl (create_concat_name (gnat_entity, - "XVZ"), - NULL_TREE, sizetype, gnu_size_unit, - false, false, false, false, NULL, - gnat_entity); - } - - gnu_variant_list.release (); - gnu_subst_list.release (); - - /* Now we can finalize it. */ - rest_of_record_type_compilation (gnu_type); - } - - /* Otherwise, go down all the components in the new type and make - them equivalent to those in the base type. */ - else - { - gnu_type = gnu_base_type; - - for (gnat_temp = First_Entity (gnat_entity); - Present (gnat_temp); - gnat_temp = Next_Entity (gnat_temp)) - if ((Ekind (gnat_temp) == E_Discriminant - && !Is_Unchecked_Union (gnat_base_type)) - || Ekind (gnat_temp) == E_Component) - save_gnu_tree (gnat_temp, - gnat_to_gnu_field_decl - (Original_Record_Component (gnat_temp)), - false); - } - } - break; - - case E_Access_Subprogram_Type: - /* Use the special descriptor type for dispatch tables if needed, - that is to say for the Prim_Ptr of a-tags.ads and its clones. - Note that we are only required to do so for static tables in - order to be compatible with the C++ ABI, but Ada 2005 allows - to extend library level tagged types at the local level so - we do it in the non-static case as well. */ - if (TARGET_VTABLE_USES_DESCRIPTORS - && Is_Dispatch_Table_Entity (gnat_entity)) - { - gnu_type = fdesc_type_node; - gnu_size = TYPE_SIZE (gnu_type); - break; - } - - /* ... fall through ... */ - - case E_Anonymous_Access_Subprogram_Type: - /* If we are not defining this entity, and we have incomplete - entities being processed above us, make a dummy type and - fill it in later. */ - if (!definition && defer_incomplete_level != 0) - { - struct incomplete *p = XNEW (struct incomplete); - - gnu_type - = build_pointer_type - (make_dummy_type (Directly_Designated_Type (gnat_entity))); - gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list, - !Comes_From_Source (gnat_entity), - debug_info_p, gnat_entity); - this_made_decl = true; - gnu_type = TREE_TYPE (gnu_decl); - save_gnu_tree (gnat_entity, gnu_decl, false); - saved = true; - - p->old_type = TREE_TYPE (gnu_type); - p->full_type = Directly_Designated_Type (gnat_entity); - p->next = defer_incomplete_list; - defer_incomplete_list = p; - break; - } - - /* ... fall through ... */ - - case E_Allocator_Type: - case E_Access_Type: - case E_Access_Attribute_Type: - case E_Anonymous_Access_Type: - case E_General_Access_Type: - { - /* The designated type and its equivalent type for gigi. */ - Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity); - Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type); - /* Whether it comes from a limited with. */ - bool is_from_limited_with - = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind) - && From_With_Type (gnat_desig_equiv)); - /* The "full view" of the designated type. If this is an incomplete - entity from a limited with, treat its non-limited view as the full - view. Otherwise, if this is an incomplete or private type, use the - full view. In the former case, we might point to a private type, - in which case, we need its full view. Also, we want to look at the - actual type used for the representation, so this takes a total of - three steps. */ - Entity_Id gnat_desig_full_direct_first - = (is_from_limited_with - ? Non_Limited_View (gnat_desig_equiv) - : (IN (Ekind (gnat_desig_equiv), Incomplete_Or_Private_Kind) - ? Full_View (gnat_desig_equiv) : Empty)); - Entity_Id gnat_desig_full_direct - = ((is_from_limited_with - && Present (gnat_desig_full_direct_first) - && IN (Ekind (gnat_desig_full_direct_first), Private_Kind)) - ? Full_View (gnat_desig_full_direct_first) - : gnat_desig_full_direct_first); - Entity_Id gnat_desig_full - = Gigi_Equivalent_Type (gnat_desig_full_direct); - /* The type actually used to represent the designated type, either - gnat_desig_full or gnat_desig_equiv. */ - Entity_Id gnat_desig_rep; - /* True if this is a pointer to an unconstrained array. */ - bool is_unconstrained_array; - /* We want to know if we'll be seeing the freeze node for any - incomplete type we may be pointing to. */ - bool in_main_unit - = (Present (gnat_desig_full) - ? In_Extended_Main_Code_Unit (gnat_desig_full) - : In_Extended_Main_Code_Unit (gnat_desig_type)); - /* True if we make a dummy type here. */ - bool made_dummy = false; - /* The mode to be used for the pointer type. */ - enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0); - /* The GCC type used for the designated type. */ - tree gnu_desig_type = NULL_TREE; - - if (!targetm.valid_pointer_mode (p_mode)) - p_mode = ptr_mode; - - /* If either the designated type or its full view is an unconstrained - array subtype, replace it with the type it's a subtype of. This - avoids problems with multiple copies of unconstrained array types. - Likewise, if the designated type is a subtype of an incomplete - record type, use the parent type to avoid order of elaboration - issues. This can lose some code efficiency, but there is no - alternative. */ - if (Ekind (gnat_desig_equiv) == E_Array_Subtype - && !Is_Constrained (gnat_desig_equiv)) - gnat_desig_equiv = Etype (gnat_desig_equiv); - if (Present (gnat_desig_full) - && ((Ekind (gnat_desig_full) == E_Array_Subtype - && !Is_Constrained (gnat_desig_full)) - || (Ekind (gnat_desig_full) == E_Record_Subtype - && Ekind (Etype (gnat_desig_full)) == E_Record_Type))) - gnat_desig_full = Etype (gnat_desig_full); - - /* Set the type that's actually the representation of the designated - type and also flag whether we have a unconstrained array. */ - gnat_desig_rep - = Present (gnat_desig_full) ? gnat_desig_full : gnat_desig_equiv; - is_unconstrained_array - = Is_Array_Type (gnat_desig_rep) && !Is_Constrained (gnat_desig_rep); - - /* If we are pointing to an incomplete type whose completion is an - unconstrained array, make dummy fat and thin pointer types to it. - Likewise if the type itself is dummy or an unconstrained array. */ - if (is_unconstrained_array - && (Present (gnat_desig_full) - || (present_gnu_tree (gnat_desig_equiv) - && TYPE_IS_DUMMY_P - (TREE_TYPE (get_gnu_tree (gnat_desig_equiv)))) - || (!in_main_unit - && defer_incomplete_level != 0 - && !present_gnu_tree (gnat_desig_equiv)) - || (in_main_unit - && is_from_limited_with - && Present (Freeze_Node (gnat_desig_equiv))))) - { - if (present_gnu_tree (gnat_desig_rep)) - gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_rep)); - else - { - gnu_desig_type = make_dummy_type (gnat_desig_rep); - made_dummy = true; - } - - /* If the call above got something that has a pointer, the pointer - is our type. This could have happened either because the type - was elaborated or because somebody else executed the code. */ - if (!TYPE_POINTER_TO (gnu_desig_type)) - build_dummy_unc_pointer_types (gnat_desig_equiv, gnu_desig_type); - gnu_type = TYPE_POINTER_TO (gnu_desig_type); - } - - /* If we already know what the full type is, use it. */ - else if (Present (gnat_desig_full) - && present_gnu_tree (gnat_desig_full)) - gnu_desig_type = TREE_TYPE (get_gnu_tree (gnat_desig_full)); - - /* Get the type of the thing we are to point to and build a pointer to - it. If it is a reference to an incomplete or private type with a - full view that is a record, make a dummy type node and get the - actual type later when we have verified it is safe. */ - else if ((!in_main_unit - && !present_gnu_tree (gnat_desig_equiv) - && Present (gnat_desig_full) - && !present_gnu_tree (gnat_desig_full) - && Is_Record_Type (gnat_desig_full)) - /* Likewise if we are pointing to a record or array and we are - to defer elaborating incomplete types. We do this as this - access type may be the full view of a private type. Note - that the unconstrained array case is handled above. */ - || ((!in_main_unit || imported_p) - && defer_incomplete_level != 0 - && !present_gnu_tree (gnat_desig_equiv) - && (Is_Record_Type (gnat_desig_rep) - || Is_Array_Type (gnat_desig_rep))) - /* If this is a reference from a limited_with type back to our - main unit and there's a freeze node for it, either we have - already processed the declaration and made the dummy type, - in which case we just reuse the latter, or we have not yet, - in which case we make the dummy type and it will be reused - when the declaration is finally processed. In both cases, - the pointer eventually created below will be automatically - adjusted when the freeze node is processed. Note that the - unconstrained array case is handled above. */ - || (in_main_unit - && is_from_limited_with - && Present (Freeze_Node (gnat_desig_rep)))) - { - gnu_desig_type = make_dummy_type (gnat_desig_equiv); - made_dummy = true; - } - - /* Otherwise handle the case of a pointer to itself. */ - else if (gnat_desig_equiv == gnat_entity) - { - gnu_type - = build_pointer_type_for_mode (void_type_node, p_mode, - No_Strict_Aliasing (gnat_entity)); - TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) = gnu_type; - } - - /* If expansion is disabled, the equivalent type of a concurrent type - is absent, so build a dummy pointer type. */ - else if (type_annotate_only && No (gnat_desig_equiv)) - gnu_type = ptr_void_type_node; - - /* Finally, handle the default case where we can just elaborate our - designated type. */ - else - gnu_desig_type = gnat_to_gnu_type (gnat_desig_equiv); - - /* It is possible that a call to gnat_to_gnu_type above resolved our - type. If so, just return it. */ - if (present_gnu_tree (gnat_entity)) - { - maybe_present = true; - break; - } - - /* If we haven't done it yet, build the pointer type the usual way. */ - if (!gnu_type) - { - /* Modify the designated type if we are pointing only to constant - objects, but don't do it for unconstrained arrays. */ - if (Is_Access_Constant (gnat_entity) - && TREE_CODE (gnu_desig_type) != UNCONSTRAINED_ARRAY_TYPE) - { - gnu_desig_type - = build_qualified_type - (gnu_desig_type, - TYPE_QUALS (gnu_desig_type) | TYPE_QUAL_CONST); - - /* Some extra processing is required if we are building a - pointer to an incomplete type (in the GCC sense). We might - have such a type if we just made a dummy, or directly out - of the call to gnat_to_gnu_type above if we are processing - an access type for a record component designating the - record type itself. */ - if (TYPE_MODE (gnu_desig_type) == VOIDmode) - { - /* We must ensure that the pointer to variant we make will - be processed by update_pointer_to when the initial type - is completed. Pretend we made a dummy and let further - processing act as usual. */ - made_dummy = true; - - /* We must ensure that update_pointer_to will not retrieve - the dummy variant when building a properly qualified - version of the complete type. We take advantage of the - fact that get_qualified_type is requiring TYPE_NAMEs to - match to influence build_qualified_type and then also - update_pointer_to here. */ - TYPE_NAME (gnu_desig_type) - = create_concat_name (gnat_desig_type, "INCOMPLETE_CST"); - } - } - - gnu_type - = build_pointer_type_for_mode (gnu_desig_type, p_mode, - No_Strict_Aliasing (gnat_entity)); - } - - /* If we are not defining this object and we have made a dummy pointer, - save our current definition, evaluate the actual type, and replace - the tentative type we made with the actual one. If we are to defer - actually looking up the actual type, make an entry in the deferred - list. If this is from a limited with, we may have to defer to the - end of the current unit. */ - if ((!in_main_unit || is_from_limited_with) && made_dummy) - { - tree gnu_old_desig_type; - - if (TYPE_IS_FAT_POINTER_P (gnu_type)) - { - gnu_old_desig_type = TYPE_UNCONSTRAINED_ARRAY (gnu_type); - if (esize == POINTER_SIZE) - gnu_type = build_pointer_type - (TYPE_OBJECT_RECORD_TYPE (gnu_old_desig_type)); - } - else - gnu_old_desig_type = TREE_TYPE (gnu_type); - - gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list, - !Comes_From_Source (gnat_entity), - debug_info_p, gnat_entity); - this_made_decl = true; - gnu_type = TREE_TYPE (gnu_decl); - save_gnu_tree (gnat_entity, gnu_decl, false); - saved = true; - - /* Note that the call to gnat_to_gnu_type on gnat_desig_equiv might - update gnu_old_desig_type directly, in which case it will not be - a dummy type any more when we get into update_pointer_to. - - This can happen e.g. when the designated type is a record type, - because their elaboration starts with an initial node from - make_dummy_type, which may be the same node as the one we got. - - Besides, variants of this non-dummy type might have been created - along the way. update_pointer_to is expected to properly take - care of those situations. */ - if (defer_incomplete_level == 0 && !is_from_limited_with) - { - update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_desig_type), - gnat_to_gnu_type (gnat_desig_equiv)); - } - else - { - struct incomplete *p = XNEW (struct incomplete); - struct incomplete **head - = (is_from_limited_with - ? &defer_limited_with : &defer_incomplete_list); - p->old_type = gnu_old_desig_type; - p->full_type = gnat_desig_equiv; - p->next = *head; - *head = p; - } - } - } - break; - - case E_Access_Protected_Subprogram_Type: - case E_Anonymous_Access_Protected_Subprogram_Type: - if (type_annotate_only && No (gnat_equiv_type)) - gnu_type = ptr_void_type_node; - else - { - /* The run-time representation is the equivalent type. */ - gnu_type = gnat_to_gnu_type (gnat_equiv_type); - maybe_present = true; - } - - if (Is_Itype (Directly_Designated_Type (gnat_entity)) - && !present_gnu_tree (Directly_Designated_Type (gnat_entity)) - && No (Freeze_Node (Directly_Designated_Type (gnat_entity))) - && !Is_Record_Type (Scope (Directly_Designated_Type (gnat_entity)))) - gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity), - NULL_TREE, 0); - - break; - - case E_Access_Subtype: - - /* We treat this as identical to its base type; any constraint is - meaningful only to the front-end. - - The designated type must be elaborated as well, if it does - not have its own freeze node. Designated (sub)types created - for constrained components of records with discriminants are - not frozen by the front-end and thus not elaborated by gigi, - because their use may appear before the base type is frozen, - and because it is not clear that they are needed anywhere in - gigi. With the current model, there is no correct place where - they could be elaborated. */ - - gnu_type = gnat_to_gnu_type (Etype (gnat_entity)); - if (Is_Itype (Directly_Designated_Type (gnat_entity)) - && !present_gnu_tree (Directly_Designated_Type (gnat_entity)) - && Is_Frozen (Directly_Designated_Type (gnat_entity)) - && No (Freeze_Node (Directly_Designated_Type (gnat_entity)))) - { - /* If we are not defining this entity, and we have incomplete - entities being processed above us, make a dummy type and - elaborate it later. */ - if (!definition && defer_incomplete_level != 0) - { - struct incomplete *p = XNEW (struct incomplete); - - p->old_type - = make_dummy_type (Directly_Designated_Type (gnat_entity)); - p->full_type = Directly_Designated_Type (gnat_entity); - p->next = defer_incomplete_list; - defer_incomplete_list = p; - } - else if (!IN (Ekind (Base_Type - (Directly_Designated_Type (gnat_entity))), - Incomplete_Or_Private_Kind)) - gnat_to_gnu_entity (Directly_Designated_Type (gnat_entity), - NULL_TREE, 0); - } - - maybe_present = true; - break; - - /* Subprogram Entities - - The following access functions are defined for subprograms: - - Etype Return type or Standard_Void_Type. - First_Formal The first formal parameter. - Is_Imported Indicates that the subprogram has appeared in - an INTERFACE or IMPORT pragma. For now we - assume that the external language is C. - Is_Exported Likewise but for an EXPORT pragma. - Is_Inlined True if the subprogram is to be inlined. - - Each parameter is first checked by calling must_pass_by_ref on its - type to determine if it is passed by reference. For parameters which - are copied in, if they are Ada In Out or Out parameters, their return - value becomes part of a record which becomes the return type of the - function (C function - note that this applies only to Ada procedures - so there is no Ada return type). Additional code to store back the - parameters will be generated on the caller side. This transformation - is done here, not in the front-end. - - The intended result of the transformation can be seen from the - equivalent source rewritings that follow: - - struct temp {int a,b}; - procedure P (A,B: In Out ...) is temp P (int A,B) - begin { - .. .. - end P; return {A,B}; - } - - temp t; - P(X,Y); t = P(X,Y); - X = t.a , Y = t.b; - - For subprogram types we need to perform mainly the same conversions to - GCC form that are needed for procedures and function declarations. The - only difference is that at the end, we make a type declaration instead - of a function declaration. */ - - case E_Subprogram_Type: - case E_Function: - case E_Procedure: - { - /* The type returned by a function or else Standard_Void_Type for a - procedure. */ - Entity_Id gnat_return_type = Etype (gnat_entity); - tree gnu_return_type; - /* The first GCC parameter declaration (a PARM_DECL node). The - PARM_DECL nodes are chained through the DECL_CHAIN field, so this - actually is the head of this parameter list. */ - tree gnu_param_list = NULL_TREE; - /* Likewise for the stub associated with an exported procedure. */ - tree gnu_stub_param_list = NULL_TREE; - /* Non-null for subprograms containing parameters passed by copy-in - copy-out (Ada In Out or Out parameters not passed by reference), - in which case it is the list of nodes used to specify the values - of the In Out/Out parameters that are returned as a record upon - procedure return. The TREE_PURPOSE of an element of this list is - a field of the record and the TREE_VALUE is the PARM_DECL - corresponding to that field. This list will be saved in the - TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */ - tree gnu_cico_list = NULL_TREE; - /* List of fields in return type of procedure with copy-in copy-out - parameters. */ - tree gnu_field_list = NULL_TREE; - /* If an import pragma asks to map this subprogram to a GCC builtin, - this is the builtin DECL node. */ - tree gnu_builtin_decl = NULL_TREE; - /* For the stub associated with an exported procedure. */ - tree gnu_stub_type = NULL_TREE, gnu_stub_name = NULL_TREE; - tree gnu_ext_name = create_concat_name (gnat_entity, NULL); - Entity_Id gnat_param; - bool inline_flag = Is_Inlined (gnat_entity); - bool public_flag = Is_Public (gnat_entity) || imported_p; - bool extern_flag - = (Is_Public (gnat_entity) && !definition) || imported_p; - bool artificial_flag = !Comes_From_Source (gnat_entity); - /* The semantics of "pure" in Ada essentially matches that of "const" - in the back-end. In particular, both properties are orthogonal to - the "nothrow" property if the EH circuitry is explicit in the - internal representation of the back-end. If we are to completely - hide the EH circuitry from it, we need to declare that calls to pure - Ada subprograms that can throw have side effects since they can - trigger an "abnormal" transfer of control flow; thus they can be - neither "const" nor "pure" in the back-end sense. */ - bool const_flag - = (Exception_Mechanism == Back_End_Exceptions - && Is_Pure (gnat_entity)); - bool volatile_flag = No_Return (gnat_entity); - bool return_by_direct_ref_p = false; - bool return_by_invisi_ref_p = false; - bool return_unconstrained_p = false; - bool has_stub = false; - int parmnum; - - /* A parameter may refer to this type, so defer completion of any - incomplete types. */ - if (kind == E_Subprogram_Type && !definition) - { - defer_incomplete_level++; - this_deferred = true; - } - - /* If the subprogram has an alias, it is probably inherited, so - we can use the original one. If the original "subprogram" - is actually an enumeration literal, it may be the first use - of its type, so we must elaborate that type now. */ - if (Present (Alias (gnat_entity))) - { - if (Ekind (Alias (gnat_entity)) == E_Enumeration_Literal) - gnat_to_gnu_entity (Etype (Alias (gnat_entity)), NULL_TREE, 0); - - gnu_decl = gnat_to_gnu_entity (Alias (gnat_entity), gnu_expr, 0); - - /* Elaborate any Itypes in the parameters of this entity. */ - for (gnat_temp = First_Formal_With_Extras (gnat_entity); - Present (gnat_temp); - gnat_temp = Next_Formal_With_Extras (gnat_temp)) - if (Is_Itype (Etype (gnat_temp))) - gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0); - - break; - } - - /* If this subprogram is expectedly bound to a GCC builtin, fetch the - corresponding DECL node. Proper generation of calls later on need - proper parameter associations so we don't "break;" here. */ - if (Convention (gnat_entity) == Convention_Intrinsic - && Present (Interface_Name (gnat_entity))) - { - gnu_builtin_decl = builtin_decl_for (gnu_ext_name); - - /* Inability to find the builtin decl most often indicates a - genuine mistake, but imports of unregistered intrinsics are - sometimes issued on purpose to allow hooking in alternate - bodies. We post a warning conditioned on Wshadow in this case, - to let developers be notified on demand without risking false - positives with common default sets of options. */ - - if (gnu_builtin_decl == NULL_TREE && warn_shadow) - post_error ("?gcc intrinsic not found for&!", gnat_entity); - } - - /* ??? What if we don't find the builtin node above ? warn ? err ? - In the current state we neither warn nor err, and calls will just - be handled as for regular subprograms. */ - - /* Look into the return type and get its associated GCC tree. If it - is not void, compute various flags for the subprogram type. */ - if (Ekind (gnat_return_type) == E_Void) - gnu_return_type = void_type_node; - else - { - /* Ada 2012 (AI05-0151): Incomplete types coming from a limited - context may now appear in parameter and result profiles. If - we are only annotating types, break circularities here. */ - if (type_annotate_only - && IN (Ekind (gnat_return_type), Incomplete_Kind) - && From_With_Type (gnat_return_type) - && In_Extended_Main_Code_Unit - (Non_Limited_View (gnat_return_type)) - && !present_gnu_tree (Non_Limited_View (gnat_return_type))) - gnu_return_type = ptr_void_type_node; - else - gnu_return_type = gnat_to_gnu_type (gnat_return_type); - - /* If this function returns by reference, make the actual return - type the pointer type and make a note of that. */ - if (Returns_By_Ref (gnat_entity)) - { - gnu_return_type = build_pointer_type (gnu_return_type); - return_by_direct_ref_p = true; - } - - /* If we are supposed to return an unconstrained array type, make - the actual return type the fat pointer type. */ - else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE) - { - gnu_return_type = TREE_TYPE (gnu_return_type); - return_unconstrained_p = true; - } - - /* Likewise, if the return type requires a transient scope, the - return value will be allocated on the secondary stack so the - actual return type is the pointer type. */ - else if (Requires_Transient_Scope (gnat_return_type)) - { - gnu_return_type = build_pointer_type (gnu_return_type); - return_unconstrained_p = true; - } - - /* If the Mechanism is By_Reference, ensure this function uses the - target's by-invisible-reference mechanism, which may not be the - same as above (e.g. it might be passing an extra parameter). */ - else if (kind == E_Function - && Mechanism (gnat_entity) == By_Reference) - return_by_invisi_ref_p = true; - - /* Likewise, if the return type is itself By_Reference. */ - else if (TYPE_IS_BY_REFERENCE_P (gnu_return_type)) - return_by_invisi_ref_p = true; - - /* If the type is a padded type and the underlying type would not - be passed by reference or the function has a foreign convention, - return the underlying type. */ - else if (TYPE_IS_PADDING_P (gnu_return_type) - && (!default_pass_by_ref - (TREE_TYPE (TYPE_FIELDS (gnu_return_type))) - || Has_Foreign_Convention (gnat_entity))) - gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type)); - - /* If the return type is unconstrained, that means it must have a - maximum size. Use the padded type as the effective return type. - And ensure the function uses the target's by-invisible-reference - mechanism to avoid copying too much data when it returns. */ - if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_return_type))) - { - tree orig_type = gnu_return_type; - - gnu_return_type - = maybe_pad_type (gnu_return_type, - max_size (TYPE_SIZE (gnu_return_type), - true), - 0, gnat_entity, false, false, false, true); - - /* Declare it now since it will never be declared otherwise. - This is necessary to ensure that its subtrees are properly - marked. */ - if (gnu_return_type != orig_type - && !DECL_P (TYPE_NAME (gnu_return_type))) - create_type_decl (TYPE_NAME (gnu_return_type), - gnu_return_type, NULL, true, - debug_info_p, gnat_entity); - - return_by_invisi_ref_p = true; - } - - /* If the return type has a size that overflows, we cannot have - a function that returns that type. This usage doesn't make - sense anyway, so give an error here. */ - if (TYPE_SIZE_UNIT (gnu_return_type) - && TREE_CODE (TYPE_SIZE_UNIT (gnu_return_type)) == INTEGER_CST - && !valid_constant_size_p (TYPE_SIZE_UNIT (gnu_return_type))) - { - post_error ("cannot return type whose size overflows", - gnat_entity); - gnu_return_type = copy_node (gnu_return_type); - TYPE_SIZE (gnu_return_type) = bitsize_zero_node; - TYPE_SIZE_UNIT (gnu_return_type) = size_zero_node; - TYPE_MAIN_VARIANT (gnu_return_type) = gnu_return_type; - TYPE_NEXT_VARIANT (gnu_return_type) = NULL_TREE; - } - } - - /* Loop over the parameters and get their associated GCC tree. While - doing this, build a copy-in copy-out structure if we need one. */ - for (gnat_param = First_Formal_With_Extras (gnat_entity), parmnum = 0; - Present (gnat_param); - gnat_param = Next_Formal_With_Extras (gnat_param), parmnum++) - { - Entity_Id gnat_param_type = Etype (gnat_param); - tree gnu_param_name = get_entity_name (gnat_param); - tree gnu_param_type, gnu_param, gnu_field; - Mechanism_Type mech = Mechanism (gnat_param); - bool copy_in_copy_out = false, fake_param_type; - - /* Ada 2012 (AI05-0151): Incomplete types coming from a limited - context may now appear in parameter and result profiles. If - we are only annotating types, break circularities here. */ - if (type_annotate_only - && IN (Ekind (gnat_param_type), Incomplete_Kind) - && From_With_Type (Etype (gnat_param_type)) - && In_Extended_Main_Code_Unit - (Non_Limited_View (gnat_param_type)) - && !present_gnu_tree (Non_Limited_View (gnat_param_type))) - { - gnu_param_type = ptr_void_type_node; - fake_param_type = true; - } - else - { - gnu_param_type = gnat_to_gnu_type (gnat_param_type); - fake_param_type = false; - } - - /* Builtins are expanded inline and there is no real call sequence - involved. So the type expected by the underlying expander is - always the type of each argument "as is". */ - if (gnu_builtin_decl) - mech = By_Copy; - /* Handle the first parameter of a valued procedure specially. */ - else if (Is_Valued_Procedure (gnat_entity) && parmnum == 0) - mech = By_Copy_Return; - /* Otherwise, see if a Mechanism was supplied that forced this - parameter to be passed one way or another. */ - else if (mech == Default - || mech == By_Copy || mech == By_Reference) - ; - else if (By_Descriptor_Last <= mech && mech <= By_Descriptor) - mech = By_Descriptor; - - else if (By_Short_Descriptor_Last <= mech && - mech <= By_Short_Descriptor) - mech = By_Short_Descriptor; - - else if (mech > 0) - { - if (TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE - || TREE_CODE (TYPE_SIZE (gnu_param_type)) != INTEGER_CST - || 0 < compare_tree_int (TYPE_SIZE (gnu_param_type), - mech)) - mech = By_Reference; - else - mech = By_Copy; - } - else - { - post_error ("unsupported mechanism for&", gnat_param); - mech = Default; - } - - /* Do not call gnat_to_gnu_param for a fake parameter type since - it will try to use the real type again. */ - if (fake_param_type) - { - if (Ekind (gnat_param) == E_Out_Parameter) - gnu_param = NULL_TREE; - else - { - gnu_param - = create_param_decl (gnu_param_name, gnu_param_type, - false); - Set_Mechanism (gnat_param, - mech == Default ? By_Copy : mech); - if (Ekind (gnat_param) == E_In_Out_Parameter) - copy_in_copy_out = true; - } - } - else - gnu_param - = gnat_to_gnu_param (gnat_param, mech, gnat_entity, - Has_Foreign_Convention (gnat_entity), - ©_in_copy_out); - - /* We are returned either a PARM_DECL or a type if no parameter - needs to be passed; in either case, adjust the type. */ - if (DECL_P (gnu_param)) - gnu_param_type = TREE_TYPE (gnu_param); - else - { - gnu_param_type = gnu_param; - gnu_param = NULL_TREE; - } - - /* The failure of this assertion will very likely come from an - order of elaboration issue for the type of the parameter. */ - gcc_assert (kind == E_Subprogram_Type - || !TYPE_IS_DUMMY_P (gnu_param_type) - || type_annotate_only); - - if (gnu_param) - { - /* If it's an exported subprogram, we build a parameter list - in parallel, in case we need to emit a stub for it. */ - if (Is_Exported (gnat_entity)) - { - gnu_stub_param_list - = chainon (gnu_param, gnu_stub_param_list); - /* Change By_Descriptor parameter to By_Reference for - the internal version of an exported subprogram. */ - if (mech == By_Descriptor || mech == By_Short_Descriptor) - { - gnu_param - = gnat_to_gnu_param (gnat_param, By_Reference, - gnat_entity, false, - ©_in_copy_out); - has_stub = true; - } - else - gnu_param = copy_node (gnu_param); - } - - gnu_param_list = chainon (gnu_param, gnu_param_list); - Sloc_to_locus (Sloc (gnat_param), - &DECL_SOURCE_LOCATION (gnu_param)); - save_gnu_tree (gnat_param, gnu_param, false); - - /* If a parameter is a pointer, this function may modify - memory through it and thus shouldn't be considered - a const function. Also, the memory may be modified - between two calls, so they can't be CSE'ed. The latter - case also handles by-ref parameters. */ - if (POINTER_TYPE_P (gnu_param_type) - || TYPE_IS_FAT_POINTER_P (gnu_param_type)) - const_flag = false; - } - - if (copy_in_copy_out) - { - if (!gnu_cico_list) - { - tree gnu_new_ret_type = make_node (RECORD_TYPE); - - /* If this is a function, we also need a field for the - return value to be placed. */ - if (TREE_CODE (gnu_return_type) != VOID_TYPE) - { - gnu_field - = create_field_decl (get_identifier ("RETVAL"), - gnu_return_type, - gnu_new_ret_type, NULL_TREE, - NULL_TREE, 0, 0); - Sloc_to_locus (Sloc (gnat_entity), - &DECL_SOURCE_LOCATION (gnu_field)); - gnu_field_list = gnu_field; - gnu_cico_list - = tree_cons (gnu_field, void_type_node, NULL_TREE); - } - - gnu_return_type = gnu_new_ret_type; - TYPE_NAME (gnu_return_type) = get_identifier ("RETURN"); - /* Set a default alignment to speed up accesses. But we - shouldn't increase the size of the structure too much, - lest it doesn't fit in return registers anymore. */ - TYPE_ALIGN (gnu_return_type) - = get_mode_alignment (ptr_mode); - } - - gnu_field - = create_field_decl (gnu_param_name, gnu_param_type, - gnu_return_type, NULL_TREE, NULL_TREE, - 0, 0); - Sloc_to_locus (Sloc (gnat_param), - &DECL_SOURCE_LOCATION (gnu_field)); - DECL_CHAIN (gnu_field) = gnu_field_list; - gnu_field_list = gnu_field; - gnu_cico_list - = tree_cons (gnu_field, gnu_param, gnu_cico_list); - } - } - - if (gnu_cico_list) - { - /* If we have a CICO list but it has only one entry, we convert - this function into a function that returns this object. */ - if (list_length (gnu_cico_list) == 1) - gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_cico_list)); - - /* Do not finalize the return type if the subprogram is stubbed - since structures are incomplete for the back-end. */ - else if (Convention (gnat_entity) != Convention_Stubbed) - { - finish_record_type (gnu_return_type, nreverse (gnu_field_list), - 0, false); - - /* Try to promote the mode of the return type if it is passed - in registers, again to speed up accesses. */ - if (TYPE_MODE (gnu_return_type) == BLKmode - && !targetm.calls.return_in_memory (gnu_return_type, - NULL_TREE)) - { - unsigned int size - = TREE_INT_CST_LOW (TYPE_SIZE (gnu_return_type)); - unsigned int i = BITS_PER_UNIT; - enum machine_mode mode; - - while (i < size) - i <<= 1; - mode = mode_for_size (i, MODE_INT, 0); - if (mode != BLKmode) - { - SET_TYPE_MODE (gnu_return_type, mode); - TYPE_ALIGN (gnu_return_type) - = GET_MODE_ALIGNMENT (mode); - TYPE_SIZE (gnu_return_type) - = bitsize_int (GET_MODE_BITSIZE (mode)); - TYPE_SIZE_UNIT (gnu_return_type) - = size_int (GET_MODE_SIZE (mode)); - } - } - - if (debug_info_p) - rest_of_record_type_compilation (gnu_return_type); - } - } - - if (Has_Stdcall_Convention (gnat_entity)) - prepend_one_attribute_to - (&attr_list, ATTR_MACHINE_ATTRIBUTE, - get_identifier ("stdcall"), NULL_TREE, - gnat_entity); - else if (Has_Thiscall_Convention (gnat_entity)) - prepend_one_attribute_to - (&attr_list, ATTR_MACHINE_ATTRIBUTE, - get_identifier ("thiscall"), NULL_TREE, - gnat_entity); - - /* If we should request stack realignment for a foreign convention - subprogram, do so. Note that this applies to task entry points in - particular. */ - if (FOREIGN_FORCE_REALIGN_STACK - && Has_Foreign_Convention (gnat_entity)) - prepend_one_attribute_to - (&attr_list, ATTR_MACHINE_ATTRIBUTE, - get_identifier ("force_align_arg_pointer"), NULL_TREE, - gnat_entity); - - /* The lists have been built in reverse. */ - gnu_param_list = nreverse (gnu_param_list); - if (has_stub) - gnu_stub_param_list = nreverse (gnu_stub_param_list); - gnu_cico_list = nreverse (gnu_cico_list); - - if (kind == E_Function) - Set_Mechanism (gnat_entity, return_unconstrained_p - || return_by_direct_ref_p - || return_by_invisi_ref_p - ? By_Reference : By_Copy); - gnu_type - = create_subprog_type (gnu_return_type, gnu_param_list, - gnu_cico_list, return_unconstrained_p, - return_by_direct_ref_p, - return_by_invisi_ref_p); - - if (has_stub) - gnu_stub_type - = create_subprog_type (gnu_return_type, gnu_stub_param_list, - gnu_cico_list, return_unconstrained_p, - return_by_direct_ref_p, - return_by_invisi_ref_p); - - /* A subprogram (something that doesn't return anything) shouldn't - be considered const since there would be no reason for such a - subprogram. Note that procedures with Out (or In Out) parameters - have already been converted into a function with a return type. */ - if (TREE_CODE (gnu_return_type) == VOID_TYPE) - const_flag = false; - - gnu_type - = build_qualified_type (gnu_type, - TYPE_QUALS (gnu_type) - | (TYPE_QUAL_CONST * const_flag) - | (TYPE_QUAL_VOLATILE * volatile_flag)); - - if (has_stub) - gnu_stub_type - = build_qualified_type (gnu_stub_type, - TYPE_QUALS (gnu_stub_type) - | (TYPE_QUAL_CONST * const_flag) - | (TYPE_QUAL_VOLATILE * volatile_flag)); - - /* If we have a builtin decl for that function, use it. Check if the - profiles are compatible and warn if they are not. The checker is - expected to post extra diagnostics in this case. */ - if (gnu_builtin_decl) - { - intrin_binding_t inb; - - inb.gnat_entity = gnat_entity; - inb.ada_fntype = gnu_type; - inb.btin_fntype = TREE_TYPE (gnu_builtin_decl); - - if (!intrin_profiles_compatible_p (&inb)) - post_error - ("?profile of& doesn''t match the builtin it binds!", - gnat_entity); - - gnu_decl = gnu_builtin_decl; - gnu_type = TREE_TYPE (gnu_builtin_decl); - break; - } - - /* If there was no specified Interface_Name and the external and - internal names of the subprogram are the same, only use the - internal name to allow disambiguation of nested subprograms. */ - if (No (Interface_Name (gnat_entity)) - && gnu_ext_name == gnu_entity_name) - gnu_ext_name = NULL_TREE; - - /* If we are defining the subprogram and it has an Address clause - we must get the address expression from the saved GCC tree for the - subprogram if it has a Freeze_Node. Otherwise, we elaborate - the address expression here since the front-end has guaranteed - in that case that the elaboration has no effects. If there is - an Address clause and we are not defining the object, just - make it a constant. */ - if (Present (Address_Clause (gnat_entity))) - { - tree gnu_address = NULL_TREE; - - if (definition) - gnu_address - = (present_gnu_tree (gnat_entity) - ? get_gnu_tree (gnat_entity) - : gnat_to_gnu (Expression (Address_Clause (gnat_entity)))); - - save_gnu_tree (gnat_entity, NULL_TREE, false); - - /* Convert the type of the object to a reference type that can - alias everything as per 13.3(19). */ - gnu_type - = build_reference_type_for_mode (gnu_type, ptr_mode, true); - if (gnu_address) - gnu_address = convert (gnu_type, gnu_address); - - gnu_decl - = create_var_decl (gnu_entity_name, gnu_ext_name, gnu_type, - gnu_address, false, Is_Public (gnat_entity), - extern_flag, false, NULL, gnat_entity); - DECL_BY_REF_P (gnu_decl) = 1; - } - - else if (kind == E_Subprogram_Type) - gnu_decl - = create_type_decl (gnu_entity_name, gnu_type, attr_list, - artificial_flag, debug_info_p, gnat_entity); - else - { - if (has_stub) - { - gnu_stub_name = gnu_ext_name; - gnu_ext_name = create_concat_name (gnat_entity, "internal"); - public_flag = false; - artificial_flag = true; - } - - gnu_decl - = create_subprog_decl (gnu_entity_name, gnu_ext_name, gnu_type, - gnu_param_list, inline_flag, public_flag, - extern_flag, artificial_flag, attr_list, - gnat_entity); - if (has_stub) - { - tree gnu_stub_decl - = create_subprog_decl (gnu_entity_name, gnu_stub_name, - gnu_stub_type, gnu_stub_param_list, - inline_flag, true, extern_flag, - false, attr_list, gnat_entity); - SET_DECL_FUNCTION_STUB (gnu_decl, gnu_stub_decl); - } - - /* This is unrelated to the stub built right above. */ - DECL_STUBBED_P (gnu_decl) - = Convention (gnat_entity) == Convention_Stubbed; - } - } - break; - - case E_Incomplete_Type: - case E_Incomplete_Subtype: - case E_Private_Type: - case E_Private_Subtype: - case E_Limited_Private_Type: - case E_Limited_Private_Subtype: - case E_Record_Type_With_Private: - case E_Record_Subtype_With_Private: - { - /* Get the "full view" of this entity. If this is an incomplete - entity from a limited with, treat its non-limited view as the - full view. Otherwise, use either the full view or the underlying - full view, whichever is present. This is used in all the tests - below. */ - Entity_Id full_view - = (IN (kind, Incomplete_Kind) && From_With_Type (gnat_entity)) - ? Non_Limited_View (gnat_entity) - : Present (Full_View (gnat_entity)) - ? Full_View (gnat_entity) - : Underlying_Full_View (gnat_entity); - - /* If this is an incomplete type with no full view, it must be a Taft - Amendment type, in which case we return a dummy type. Otherwise, - just get the type from its Etype. */ - if (No (full_view)) - { - if (kind == E_Incomplete_Type) - { - gnu_type = make_dummy_type (gnat_entity); - gnu_decl = TYPE_STUB_DECL (gnu_type); - } - else - { - gnu_decl = gnat_to_gnu_entity (Etype (gnat_entity), - NULL_TREE, 0); - maybe_present = true; - } - break; - } - - /* If we already made a type for the full view, reuse it. */ - else if (present_gnu_tree (full_view)) - { - gnu_decl = get_gnu_tree (full_view); - break; - } - - /* Otherwise, if we are not defining the type now, get the type - from the full view. But always get the type from the full view - for define on use types, since otherwise we won't see them! */ - else if (!definition - || (Is_Itype (full_view) - && No (Freeze_Node (gnat_entity))) - || (Is_Itype (gnat_entity) - && No (Freeze_Node (full_view)))) - { - gnu_decl = gnat_to_gnu_entity (full_view, NULL_TREE, 0); - maybe_present = true; - break; - } - - /* For incomplete types, make a dummy type entry which will be - replaced later. Save it as the full declaration's type so - we can do any needed updates when we see it. */ - gnu_type = make_dummy_type (gnat_entity); - gnu_decl = TYPE_STUB_DECL (gnu_type); - if (Has_Completion_In_Body (gnat_entity)) - DECL_TAFT_TYPE_P (gnu_decl) = 1; - save_gnu_tree (full_view, gnu_decl, 0); - break; - } - - case E_Class_Wide_Type: - /* Class-wide types are always transformed into their root type. */ - gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0); - maybe_present = true; - break; - - case E_Task_Type: - case E_Task_Subtype: - case E_Protected_Type: - case E_Protected_Subtype: - /* Concurrent types are always transformed into their record type. */ - if (type_annotate_only && No (gnat_equiv_type)) - gnu_type = void_type_node; - else - gnu_decl = gnat_to_gnu_entity (gnat_equiv_type, NULL_TREE, 0); - maybe_present = true; - break; - - case E_Label: - gnu_decl = create_label_decl (gnu_entity_name, gnat_entity); - break; - - case E_Block: - case E_Loop: - /* Nothing at all to do here, so just return an ERROR_MARK and claim - we've already saved it, so we don't try to. */ - gnu_decl = error_mark_node; - saved = true; - break; - - default: - gcc_unreachable (); - } - - /* If we had a case where we evaluated another type and it might have - defined this one, handle it here. */ - if (maybe_present && present_gnu_tree (gnat_entity)) - { - gnu_decl = get_gnu_tree (gnat_entity); - saved = true; - } - - /* If we are processing a type and there is either no decl for it or - we just made one, do some common processing for the type, such as - handling alignment and possible padding. */ - if (is_type && (!gnu_decl || this_made_decl)) - { - /* Tell the middle-end that objects of tagged types are guaranteed to - be properly aligned. This is necessary because conversions to the - class-wide type are translated into conversions to the root type, - which can be less aligned than some of its derived types. */ - if (Is_Tagged_Type (gnat_entity) - || Is_Class_Wide_Equivalent_Type (gnat_entity)) - TYPE_ALIGN_OK (gnu_type) = 1; - - /* Record whether the type is passed by reference. */ - if (!VOID_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity)) - TYPE_BY_REFERENCE_P (gnu_type) = 1; - - /* ??? Don't set the size for a String_Literal since it is either - confirming or we don't handle it properly (if the low bound is - non-constant). */ - if (!gnu_size && kind != E_String_Literal_Subtype) - { - Uint gnat_size = Known_Esize (gnat_entity) - ? Esize (gnat_entity) : RM_Size (gnat_entity); - gnu_size - = validate_size (gnat_size, gnu_type, gnat_entity, TYPE_DECL, - false, Has_Size_Clause (gnat_entity)); - } - - /* If a size was specified, see if we can make a new type of that size - by rearranging the type, for example from a fat to a thin pointer. */ - if (gnu_size) - { - gnu_type - = make_type_from_size (gnu_type, gnu_size, - Has_Biased_Representation (gnat_entity)); - - if (operand_equal_p (TYPE_SIZE (gnu_type), gnu_size, 0) - && operand_equal_p (rm_size (gnu_type), gnu_size, 0)) - gnu_size = NULL_TREE; - } - - /* If the alignment hasn't already been processed and this is - not an unconstrained array, see if an alignment is specified. - If not, we pick a default alignment for atomic objects. */ - if (align != 0 || TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE) - ; - else if (Known_Alignment (gnat_entity)) - { - align = validate_alignment (Alignment (gnat_entity), gnat_entity, - TYPE_ALIGN (gnu_type)); - - /* Warn on suspiciously large alignments. This should catch - errors about the (alignment,byte)/(size,bit) discrepancy. */ - if (align > BIGGEST_ALIGNMENT && Has_Alignment_Clause (gnat_entity)) - { - tree size; - - /* If a size was specified, take it into account. Otherwise - use the RM size for records or unions as the type size has - already been adjusted to the alignment. */ - if (gnu_size) - size = gnu_size; - else if (RECORD_OR_UNION_TYPE_P (gnu_type) - && !TYPE_FAT_POINTER_P (gnu_type)) - size = rm_size (gnu_type); - else - size = TYPE_SIZE (gnu_type); - - /* Consider an alignment as suspicious if the alignment/size - ratio is greater or equal to the byte/bit ratio. */ - if (host_integerp (size, 1) - && align >= TREE_INT_CST_LOW (size) * BITS_PER_UNIT) - post_error_ne ("?suspiciously large alignment specified for&", - Expression (Alignment_Clause (gnat_entity)), - gnat_entity); - } - } - else if (Is_Atomic (gnat_entity) && !gnu_size - && host_integerp (TYPE_SIZE (gnu_type), 1) - && integer_pow2p (TYPE_SIZE (gnu_type))) - align = MIN (BIGGEST_ALIGNMENT, - tree_low_cst (TYPE_SIZE (gnu_type), 1)); - else if (Is_Atomic (gnat_entity) && gnu_size - && host_integerp (gnu_size, 1) - && integer_pow2p (gnu_size)) - align = MIN (BIGGEST_ALIGNMENT, tree_low_cst (gnu_size, 1)); - - /* See if we need to pad the type. If we did, and made a record, - the name of the new type may be changed. So get it back for - us when we make the new TYPE_DECL below. */ - if (gnu_size || align > 0) - gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, - false, !gnu_decl, definition, false); - - if (TYPE_IS_PADDING_P (gnu_type)) - { - gnu_entity_name = TYPE_NAME (gnu_type); - if (TREE_CODE (gnu_entity_name) == TYPE_DECL) - gnu_entity_name = DECL_NAME (gnu_entity_name); - } - - /* Now set the RM size of the type. We cannot do it before padding - because we need to accept arbitrary RM sizes on integral types. */ - set_rm_size (RM_Size (gnat_entity), gnu_type, gnat_entity); - - /* If we are at global level, GCC will have applied variable_size to - the type, but that won't have done anything. So, if it's not - a constant or self-referential, call elaborate_expression_1 to - make a variable for the size rather than calculating it each time. - Handle both the RM size and the actual size. */ - if (global_bindings_p () - && TYPE_SIZE (gnu_type) - && !TREE_CONSTANT (TYPE_SIZE (gnu_type)) - && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) - { - tree size = TYPE_SIZE (gnu_type); - - TYPE_SIZE (gnu_type) - = elaborate_expression_1 (size, gnat_entity, - get_identifier ("SIZE"), - definition, false); - - /* ??? For now, store the size as a multiple of the alignment in - bytes so that we can see the alignment from the tree. */ - TYPE_SIZE_UNIT (gnu_type) - = elaborate_expression_2 (TYPE_SIZE_UNIT (gnu_type), gnat_entity, - get_identifier ("SIZE_A_UNIT"), - definition, false, - TYPE_ALIGN (gnu_type)); - - /* ??? gnu_type may come from an existing type so the MULT_EXPR node - may not be marked by the call to create_type_decl below. */ - MARK_VISITED (TYPE_SIZE_UNIT (gnu_type)); - - if (TREE_CODE (gnu_type) == RECORD_TYPE) - { - tree variant_part = get_variant_part (gnu_type); - tree ada_size = TYPE_ADA_SIZE (gnu_type); - - if (variant_part) - { - tree union_type = TREE_TYPE (variant_part); - tree offset = DECL_FIELD_OFFSET (variant_part); - - /* If the position of the variant part is constant, subtract - it from the size of the type of the parent to get the new - size. This manual CSE reduces the data size. */ - if (TREE_CODE (offset) == INTEGER_CST) - { - tree bitpos = DECL_FIELD_BIT_OFFSET (variant_part); - TYPE_SIZE (union_type) - = size_binop (MINUS_EXPR, TYPE_SIZE (gnu_type), - bit_from_pos (offset, bitpos)); - TYPE_SIZE_UNIT (union_type) - = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (gnu_type), - byte_from_pos (offset, bitpos)); - } - else - { - TYPE_SIZE (union_type) - = elaborate_expression_1 (TYPE_SIZE (union_type), - gnat_entity, - get_identifier ("VSIZE"), - definition, false); - - /* ??? For now, store the size as a multiple of the - alignment in bytes so that we can see the alignment - from the tree. */ - TYPE_SIZE_UNIT (union_type) - = elaborate_expression_2 (TYPE_SIZE_UNIT (union_type), - gnat_entity, - get_identifier - ("VSIZE_A_UNIT"), - definition, false, - TYPE_ALIGN (union_type)); - - /* ??? For now, store the offset as a multiple of the - alignment in bytes so that we can see the alignment - from the tree. */ - DECL_FIELD_OFFSET (variant_part) - = elaborate_expression_2 (offset, - gnat_entity, - get_identifier ("VOFFSET"), - definition, false, - DECL_OFFSET_ALIGN - (variant_part)); - } - - DECL_SIZE (variant_part) = TYPE_SIZE (union_type); - DECL_SIZE_UNIT (variant_part) = TYPE_SIZE_UNIT (union_type); - } - - if (operand_equal_p (ada_size, size, 0)) - ada_size = TYPE_SIZE (gnu_type); - else - ada_size - = elaborate_expression_1 (ada_size, gnat_entity, - get_identifier ("RM_SIZE"), - definition, false); - SET_TYPE_ADA_SIZE (gnu_type, ada_size); - } - } - - /* If this is a record type or subtype, call elaborate_expression_2 on - any field position. Do this for both global and local types. - Skip any fields that we haven't made trees for to avoid problems with - class wide types. */ - if (IN (kind, Record_Kind)) - for (gnat_temp = First_Entity (gnat_entity); Present (gnat_temp); - gnat_temp = Next_Entity (gnat_temp)) - if (Ekind (gnat_temp) == E_Component && present_gnu_tree (gnat_temp)) - { - tree gnu_field = get_gnu_tree (gnat_temp); - - /* ??? For now, store the offset as a multiple of the alignment - in bytes so that we can see the alignment from the tree. */ - if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field))) - { - DECL_FIELD_OFFSET (gnu_field) - = elaborate_expression_2 (DECL_FIELD_OFFSET (gnu_field), - gnat_temp, - get_identifier ("OFFSET"), - definition, false, - DECL_OFFSET_ALIGN (gnu_field)); - - /* ??? The context of gnu_field is not necessarily gnu_type - so the MULT_EXPR node built above may not be marked by - the call to create_type_decl below. */ - if (global_bindings_p ()) - MARK_VISITED (DECL_FIELD_OFFSET (gnu_field)); - } - } - - if (Treat_As_Volatile (gnat_entity)) - gnu_type - = build_qualified_type (gnu_type, - TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE); - - if (Is_Atomic (gnat_entity)) - check_ok_for_atomic (gnu_type, gnat_entity, false); - - if (Present (Alignment_Clause (gnat_entity))) - TYPE_USER_ALIGN (gnu_type) = 1; - - if (Universal_Aliasing (gnat_entity)) - TYPE_UNIVERSAL_ALIASING_P (TYPE_MAIN_VARIANT (gnu_type)) = 1; - - if (!gnu_decl) - gnu_decl = create_type_decl (gnu_entity_name, gnu_type, attr_list, - !Comes_From_Source (gnat_entity), - debug_info_p, gnat_entity); - else - { - TREE_TYPE (gnu_decl) = gnu_type; - TYPE_STUB_DECL (gnu_type) = gnu_decl; - } - } - - if (is_type && !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_decl))) - { - gnu_type = TREE_TYPE (gnu_decl); - - /* If this is a derived type, relate its alias set to that of its parent - to avoid troubles when a call to an inherited primitive is inlined in - a context where a derived object is accessed. The inlined code works - on the parent view so the resulting code may access the same object - using both the parent and the derived alias sets, which thus have to - conflict. As the same issue arises with component references, the - parent alias set also has to conflict with composite types enclosing - derived components. For instance, if we have: - - type D is new T; - type R is record - Component : D; - end record; - - we want T to conflict with both D and R, in addition to R being a - superset of D by record/component construction. - - One way to achieve this is to perform an alias set copy from the - parent to the derived type. This is not quite appropriate, though, - as we don't want separate derived types to conflict with each other: - - type I1 is new Integer; - type I2 is new Integer; - - We want I1 and I2 to both conflict with Integer but we do not want - I1 to conflict with I2, and an alias set copy on derivation would - have that effect. - - The option chosen is to make the alias set of the derived type a - superset of that of its parent type. It trivially fulfills the - simple requirement for the Integer derivation example above, and - the component case as well by superset transitivity: - - superset superset - R ----------> D ----------> T - - However, for composite types, conversions between derived types are - translated into VIEW_CONVERT_EXPRs so a sequence like: - - type Comp1 is new Comp; - type Comp2 is new Comp; - procedure Proc (C : Comp1); - - C : Comp2; - Proc (Comp1 (C)); - - is translated into: - - C : Comp2; - Proc ((Comp1 &) &VIEW_CONVERT_EXPR <Comp1> (C)); - - and gimplified into: - - C : Comp2; - Comp1 *C.0; - C.0 = (Comp1 *) &C; - Proc (C.0); - - i.e. generates code involving type punning. Therefore, Comp1 needs - to conflict with Comp2 and an alias set copy is required. - - The language rules ensure the parent type is already frozen here. */ - if (Is_Derived_Type (gnat_entity)) - { - tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_entity)); - relate_alias_sets (gnu_type, gnu_parent_type, - Is_Composite_Type (gnat_entity) - ? ALIAS_SET_COPY : ALIAS_SET_SUPERSET); - } - - /* Back-annotate the Alignment of the type if not already in the - tree. Likewise for sizes. */ - if (Unknown_Alignment (gnat_entity)) - { - unsigned int double_align, align; - bool is_capped_double, align_clause; - - /* If the default alignment of "double" or larger scalar types is - specifically capped and this is not an array with an alignment - clause on the component type, return the cap. */ - if ((double_align = double_float_alignment) > 0) - is_capped_double - = is_double_float_or_array (gnat_entity, &align_clause); - else if ((double_align = double_scalar_alignment) > 0) - is_capped_double - = is_double_scalar_or_array (gnat_entity, &align_clause); - else - is_capped_double = align_clause = false; - - if (is_capped_double && !align_clause) - align = double_align; - else - align = TYPE_ALIGN (gnu_type) / BITS_PER_UNIT; - - Set_Alignment (gnat_entity, UI_From_Int (align)); - } - - if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type)) - { - tree gnu_size = TYPE_SIZE (gnu_type); - - /* If the size is self-referential, annotate the maximum value. */ - if (CONTAINS_PLACEHOLDER_P (gnu_size)) - gnu_size = max_size (gnu_size, true); - - /* If we are just annotating types and the type is tagged, the tag - and the parent components are not generated by the front-end so - sizes must be adjusted if there is no representation clause. */ - if (type_annotate_only - && Is_Tagged_Type (gnat_entity) - && !VOID_TYPE_P (gnu_type) - && (!TYPE_FIELDS (gnu_type) - || integer_zerop (bit_position (TYPE_FIELDS (gnu_type))))) - { - tree pointer_size = bitsize_int (POINTER_SIZE), offset; - Uint uint_size; - - if (Is_Derived_Type (gnat_entity)) - { - Entity_Id gnat_parent = Etype (Base_Type (gnat_entity)); - offset = UI_To_gnu (Esize (gnat_parent), bitsizetype); - Set_Alignment (gnat_entity, Alignment (gnat_parent)); - } - else - offset = pointer_size; - - if (TYPE_FIELDS (gnu_type)) - offset - = round_up (offset, DECL_ALIGN (TYPE_FIELDS (gnu_type))); - - gnu_size = size_binop (PLUS_EXPR, gnu_size, offset); - gnu_size = round_up (gnu_size, POINTER_SIZE); - uint_size = annotate_value (gnu_size); - Set_Esize (gnat_entity, uint_size); - Set_RM_Size (gnat_entity, uint_size); - } - else - Set_Esize (gnat_entity, annotate_value (gnu_size)); - } - - if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type)) - Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type))); - } - - /* If we really have a ..._DECL node, set a couple of flags on it. But we - cannot do so if we are reusing the ..._DECL node made for an equivalent - type or an alias or a renamed object as the predicates don't apply to it - but to GNAT_ENTITY. */ - if (DECL_P (gnu_decl) - && !(is_type && gnat_equiv_type != gnat_entity) - && !Present (Alias (gnat_entity)) - && !(Present (Renamed_Object (gnat_entity)) && saved)) - { - if (!Comes_From_Source (gnat_entity)) - DECL_ARTIFICIAL (gnu_decl) = 1; - - if (!debug_info_p) - DECL_IGNORED_P (gnu_decl) = 1; - } - - /* If we haven't already, associate the ..._DECL node that we just made with - the input GNAT entity node. */ - if (!saved) - save_gnu_tree (gnat_entity, gnu_decl, false); - - /* If this is an enumeration or floating-point type, we were not able to set - the bounds since they refer to the type. These are always static. */ - if ((kind == E_Enumeration_Type && Present (First_Literal (gnat_entity))) - || (kind == E_Floating_Point_Type && !Vax_Float (gnat_entity))) - { - tree gnu_scalar_type = gnu_type; - tree gnu_low_bound, gnu_high_bound; - - /* If this is a padded type, we need to use the underlying type. */ - if (TYPE_IS_PADDING_P (gnu_scalar_type)) - gnu_scalar_type = TREE_TYPE (TYPE_FIELDS (gnu_scalar_type)); - - /* If this is a floating point type and we haven't set a floating - point type yet, use this in the evaluation of the bounds. */ - if (!longest_float_type_node && kind == E_Floating_Point_Type) - longest_float_type_node = gnu_scalar_type; - - gnu_low_bound = gnat_to_gnu (Type_Low_Bound (gnat_entity)); - gnu_high_bound = gnat_to_gnu (Type_High_Bound (gnat_entity)); - - if (kind == E_Enumeration_Type) - { - /* Enumeration types have specific RM bounds. */ - SET_TYPE_RM_MIN_VALUE (gnu_scalar_type, gnu_low_bound); - SET_TYPE_RM_MAX_VALUE (gnu_scalar_type, gnu_high_bound); - } - else - { - /* Floating-point types don't have specific RM bounds. */ - TYPE_GCC_MIN_VALUE (gnu_scalar_type) = gnu_low_bound; - TYPE_GCC_MAX_VALUE (gnu_scalar_type) = gnu_high_bound; - } - } - - /* If we deferred processing of incomplete types, re-enable it. If there - were no other disables and we have deferred types to process, do so. */ - if (this_deferred - && --defer_incomplete_level == 0 - && defer_incomplete_list) - { - struct incomplete *p, *next; - - /* We are back to level 0 for the deferring of incomplete types. - But processing these incomplete types below may itself require - deferring, so preserve what we have and restart from scratch. */ - p = defer_incomplete_list; - defer_incomplete_list = NULL; - - for (; p; p = next) - { - next = p->next; - - if (p->old_type) - update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), - gnat_to_gnu_type (p->full_type)); - free (p); - } - } - - /* If we are not defining this type, see if it's on one of the lists of - incomplete types. If so, handle the list entry now. */ - if (is_type && !definition) - { - struct incomplete *p; - - for (p = defer_incomplete_list; p; p = p->next) - if (p->old_type && p->full_type == gnat_entity) - { - update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), - TREE_TYPE (gnu_decl)); - p->old_type = NULL_TREE; - } - - for (p = defer_limited_with; p; p = p->next) - if (p->old_type && Non_Limited_View (p->full_type) == gnat_entity) - { - update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), - TREE_TYPE (gnu_decl)); - p->old_type = NULL_TREE; - } - } - - if (this_global) - force_global--; - - /* If this is a packed array type whose original array type is itself - an Itype without freeze node, make sure the latter is processed. */ - if (Is_Packed_Array_Type (gnat_entity) - && Is_Itype (Original_Array_Type (gnat_entity)) - && No (Freeze_Node (Original_Array_Type (gnat_entity))) - && !present_gnu_tree (Original_Array_Type (gnat_entity))) - gnat_to_gnu_entity (Original_Array_Type (gnat_entity), NULL_TREE, 0); - - return gnu_decl; -} - -/* Similar, but if the returned value is a COMPONENT_REF, return the - FIELD_DECL. */ - -tree -gnat_to_gnu_field_decl (Entity_Id gnat_entity) -{ - tree gnu_field = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0); - - if (TREE_CODE (gnu_field) == COMPONENT_REF) - gnu_field = TREE_OPERAND (gnu_field, 1); - - return gnu_field; -} - -/* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return - the GCC type corresponding to that entity. */ - -tree -gnat_to_gnu_type (Entity_Id gnat_entity) -{ - tree gnu_decl; - - /* The back end never attempts to annotate generic types. */ - if (Is_Generic_Type (gnat_entity) && type_annotate_only) - return void_type_node; - - gnu_decl = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0); - gcc_assert (TREE_CODE (gnu_decl) == TYPE_DECL); - - return TREE_TYPE (gnu_decl); -} - -/* Similar, but GNAT_ENTITY is assumed to refer to a GNAT type. Return - the unpadded version of the GCC type corresponding to that entity. */ - -tree -get_unpadded_type (Entity_Id gnat_entity) -{ - tree type = gnat_to_gnu_type (gnat_entity); - - if (TYPE_IS_PADDING_P (type)) - type = TREE_TYPE (TYPE_FIELDS (type)); - - return type; -} - -/* Return the DECL associated with the public subprogram GNAT_ENTITY but whose - type has been changed to that of the parameterless procedure, except if an - alias is already present, in which case it is returned instead. */ - -tree -get_minimal_subprog_decl (Entity_Id gnat_entity) -{ - tree gnu_entity_name, gnu_ext_name; - struct attrib *attr_list = NULL; - - /* See the E_Function/E_Procedure case of gnat_to_gnu_entity for the model - of the handling applied here. */ - - while (Present (Alias (gnat_entity))) - { - gnat_entity = Alias (gnat_entity); - if (present_gnu_tree (gnat_entity)) - return get_gnu_tree (gnat_entity); - } - - gnu_entity_name = get_entity_name (gnat_entity); - gnu_ext_name = create_concat_name (gnat_entity, NULL); - - if (Has_Stdcall_Convention (gnat_entity)) - prepend_one_attribute_to (&attr_list, ATTR_MACHINE_ATTRIBUTE, - get_identifier ("stdcall"), NULL_TREE, - gnat_entity); - else if (Has_Thiscall_Convention (gnat_entity)) - prepend_one_attribute_to (&attr_list, ATTR_MACHINE_ATTRIBUTE, - get_identifier ("thiscall"), NULL_TREE, - gnat_entity); - - if (No (Interface_Name (gnat_entity)) && gnu_ext_name == gnu_entity_name) - gnu_ext_name = NULL_TREE; - - return - create_subprog_decl (gnu_entity_name, gnu_ext_name, void_ftype, NULL_TREE, - false, true, true, true, attr_list, gnat_entity); -} - -/* Return whether the E_Subprogram_Type/E_Function/E_Procedure GNAT_ENTITY is - a C++ imported method or equivalent. - - We use the predicate on 32-bit x86/Windows to find out whether we need to - use the "thiscall" calling convention for GNAT_ENTITY. This convention is - used for C++ methods (functions with METHOD_TYPE) by the back-end. */ - -bool -is_cplusplus_method (Entity_Id gnat_entity) -{ - if (Convention (gnat_entity) != Convention_CPP) - return False; - - /* This is the main case: C++ method imported as a primitive operation. */ - if (Is_Dispatching_Operation (gnat_entity)) - return True; - - /* A thunk needs to be handled like its associated primitive operation. */ - if (Is_Subprogram (gnat_entity) && Is_Thunk (gnat_entity)) - return True; - - /* C++ classes with no virtual functions can be imported as limited - record types, but we need to return true for the constructors. */ - if (Is_Constructor (gnat_entity)) - return True; - - /* This is set on the E_Subprogram_Type built for a dispatching call. */ - if (Is_Dispatch_Table_Entity (gnat_entity)) - return True; - - return False; -} - -/* Finalize the processing of From_With_Type incomplete types. */ - -void -finalize_from_with_types (void) -{ - struct incomplete *p, *next; - - p = defer_limited_with; - defer_limited_with = NULL; - - for (; p; p = next) - { - next = p->next; - - if (p->old_type) - update_pointer_to (TYPE_MAIN_VARIANT (p->old_type), - gnat_to_gnu_type (p->full_type)); - free (p); - } -} - -/* Return the equivalent type to be used for GNAT_ENTITY, if it's a - kind of type (such E_Task_Type) that has a different type which Gigi - uses for its representation. If the type does not have a special type - for its representation, return GNAT_ENTITY. If a type is supposed to - exist, but does not, abort unless annotating types, in which case - return Empty. If GNAT_ENTITY is Empty, return Empty. */ - -Entity_Id -Gigi_Equivalent_Type (Entity_Id gnat_entity) -{ - Entity_Id gnat_equiv = gnat_entity; - - if (No (gnat_entity)) - return gnat_entity; - - switch (Ekind (gnat_entity)) - { - case E_Class_Wide_Subtype: - if (Present (Equivalent_Type (gnat_entity))) - gnat_equiv = Equivalent_Type (gnat_entity); - break; - - case E_Access_Protected_Subprogram_Type: - case E_Anonymous_Access_Protected_Subprogram_Type: - gnat_equiv = Equivalent_Type (gnat_entity); - break; - - case E_Class_Wide_Type: - gnat_equiv = Root_Type (gnat_entity); - break; - - case E_Task_Type: - case E_Task_Subtype: - case E_Protected_Type: - case E_Protected_Subtype: - gnat_equiv = Corresponding_Record_Type (gnat_entity); - break; - - default: - break; - } - - gcc_assert (Present (gnat_equiv) || type_annotate_only); - - return gnat_equiv; -} - -/* Return a GCC tree for a type corresponding to the component type of the - array type or subtype GNAT_ARRAY. DEFINITION is true if this component - is for an array being defined. DEBUG_INFO_P is true if we need to write - debug information for other types that we may create in the process. */ - -static tree -gnat_to_gnu_component_type (Entity_Id gnat_array, bool definition, - bool debug_info_p) -{ - const Entity_Id gnat_type = Component_Type (gnat_array); - tree gnu_type = gnat_to_gnu_type (gnat_type); - tree gnu_comp_size; - - /* Try to get a smaller form of the component if needed. */ - if ((Is_Packed (gnat_array) - || Has_Component_Size_Clause (gnat_array)) - && !Is_Bit_Packed_Array (gnat_array) - && !Has_Aliased_Components (gnat_array) - && !Strict_Alignment (gnat_type) - && RECORD_OR_UNION_TYPE_P (gnu_type) - && !TYPE_FAT_POINTER_P (gnu_type) - && host_integerp (TYPE_SIZE (gnu_type), 1)) - gnu_type = make_packable_type (gnu_type, false); - - if (Has_Atomic_Components (gnat_array)) - check_ok_for_atomic (gnu_type, gnat_array, true); - - /* Get and validate any specified Component_Size. */ - gnu_comp_size - = validate_size (Component_Size (gnat_array), gnu_type, gnat_array, - Is_Bit_Packed_Array (gnat_array) ? TYPE_DECL : VAR_DECL, - true, Has_Component_Size_Clause (gnat_array)); - - /* If the array has aliased components and the component size can be zero, - force at least unit size to ensure that the components have distinct - addresses. */ - if (!gnu_comp_size - && Has_Aliased_Components (gnat_array) - && (integer_zerop (TYPE_SIZE (gnu_type)) - || (TREE_CODE (gnu_type) == ARRAY_TYPE - && !TREE_CONSTANT (TYPE_SIZE (gnu_type))))) - gnu_comp_size - = size_binop (MAX_EXPR, TYPE_SIZE (gnu_type), bitsize_unit_node); - - /* If the component type is a RECORD_TYPE that has a self-referential size, - then use the maximum size for the component size. */ - if (!gnu_comp_size - && TREE_CODE (gnu_type) == RECORD_TYPE - && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) - gnu_comp_size = max_size (TYPE_SIZE (gnu_type), true); - - /* Honor the component size. This is not needed for bit-packed arrays. */ - if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_array)) - { - tree orig_type = gnu_type; - unsigned int max_align; - - /* If an alignment is specified, use it as a cap on the component type - so that it can be honored for the whole type. But ignore it for the - original type of packed array types. */ - if (No (Packed_Array_Type (gnat_array)) && Known_Alignment (gnat_array)) - max_align = validate_alignment (Alignment (gnat_array), gnat_array, 0); - else - max_align = 0; - - gnu_type = make_type_from_size (gnu_type, gnu_comp_size, false); - if (max_align > 0 && TYPE_ALIGN (gnu_type) > max_align) - gnu_type = orig_type; - else - orig_type = gnu_type; - - gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0, gnat_array, - true, false, definition, true); - - /* If a padding record was made, declare it now since it will never be - declared otherwise. This is necessary to ensure that its subtrees - are properly marked. */ - if (gnu_type != orig_type && !DECL_P (TYPE_NAME (gnu_type))) - create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL, true, - debug_info_p, gnat_array); - } - - if (Has_Volatile_Components (gnat_array)) - gnu_type - = build_qualified_type (gnu_type, - TYPE_QUALS (gnu_type) | TYPE_QUAL_VOLATILE); - - return gnu_type; -} - -/* Return a GCC tree for a parameter corresponding to GNAT_PARAM and - using MECH as its passing mechanism, to be placed in the parameter - list built for GNAT_SUBPROG. Assume a foreign convention for the - latter if FOREIGN is true. Also set CICO to true if the parameter - must use the copy-in copy-out implementation mechanism. - - The returned tree is a PARM_DECL, except for those cases where no - parameter needs to be actually passed to the subprogram; the type - of this "shadow" parameter is then returned instead. */ - -static tree -gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech, - Entity_Id gnat_subprog, bool foreign, bool *cico) -{ - tree gnu_param_name = get_entity_name (gnat_param); - tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param)); - tree gnu_param_type_alt = NULL_TREE; - bool in_param = (Ekind (gnat_param) == E_In_Parameter); - /* The parameter can be indirectly modified if its address is taken. */ - bool ro_param = in_param && !Address_Taken (gnat_param); - bool by_return = false, by_component_ptr = false; - bool by_ref = false, by_double_ref = false; - tree gnu_param; - - /* Copy-return is used only for the first parameter of a valued procedure. - It's a copy mechanism for which a parameter is never allocated. */ - if (mech == By_Copy_Return) - { - gcc_assert (Ekind (gnat_param) == E_Out_Parameter); - mech = By_Copy; - by_return = true; - } - - /* If this is either a foreign function or if the underlying type won't - be passed by reference, strip off possible padding type. */ - if (TYPE_IS_PADDING_P (gnu_param_type)) - { - tree unpadded_type = TREE_TYPE (TYPE_FIELDS (gnu_param_type)); - - if (mech == By_Reference - || foreign - || (!must_pass_by_ref (unpadded_type) - && (mech == By_Copy || !default_pass_by_ref (unpadded_type)))) - gnu_param_type = unpadded_type; - } - - /* If this is a read-only parameter, make a variant of the type that is - read-only. ??? However, if this is an unconstrained array, that type - can be very complex, so skip it for now. Likewise for any other - self-referential type. */ - if (ro_param - && TREE_CODE (gnu_param_type) != UNCONSTRAINED_ARRAY_TYPE - && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_param_type))) - gnu_param_type = build_qualified_type (gnu_param_type, - (TYPE_QUALS (gnu_param_type) - | TYPE_QUAL_CONST)); - - /* For foreign conventions, pass arrays as pointers to the element type. - First check for unconstrained array and get the underlying array. */ - if (foreign && TREE_CODE (gnu_param_type) == UNCONSTRAINED_ARRAY_TYPE) - gnu_param_type - = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_param_type)))); - - /* For GCC builtins, pass Address integer types as (void *) */ - if (Convention (gnat_subprog) == Convention_Intrinsic - && Present (Interface_Name (gnat_subprog)) - && Is_Descendent_Of_Address (Etype (gnat_param))) - gnu_param_type = ptr_void_type_node; - - /* VMS descriptors are themselves passed by reference. */ - if (mech == By_Short_Descriptor || - (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !flag_vms_malloc64)) - gnu_param_type - = build_pointer_type (build_vms_descriptor32 (gnu_param_type, - Mechanism (gnat_param), - gnat_subprog)); - else if (mech == By_Descriptor) - { - /* Build both a 32-bit and 64-bit descriptor, one of which will be - chosen in fill_vms_descriptor. */ - gnu_param_type_alt - = build_pointer_type (build_vms_descriptor32 (gnu_param_type, - Mechanism (gnat_param), - gnat_subprog)); - gnu_param_type - = build_pointer_type (build_vms_descriptor (gnu_param_type, - Mechanism (gnat_param), - gnat_subprog)); - } - - /* Arrays are passed as pointers to element type for foreign conventions. */ - else if (foreign - && mech != By_Copy - && TREE_CODE (gnu_param_type) == ARRAY_TYPE) - { - /* Strip off any multi-dimensional entries, then strip - off the last array to get the component type. */ - while (TREE_CODE (TREE_TYPE (gnu_param_type)) == ARRAY_TYPE - && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_param_type))) - gnu_param_type = TREE_TYPE (gnu_param_type); - - by_component_ptr = true; - gnu_param_type = TREE_TYPE (gnu_param_type); - - if (ro_param) - gnu_param_type = build_qualified_type (gnu_param_type, - (TYPE_QUALS (gnu_param_type) - | TYPE_QUAL_CONST)); - - gnu_param_type = build_pointer_type (gnu_param_type); - } - - /* Fat pointers are passed as thin pointers for foreign conventions. */ - else if (foreign && TYPE_IS_FAT_POINTER_P (gnu_param_type)) - gnu_param_type - = make_type_from_size (gnu_param_type, size_int (POINTER_SIZE), 0); - - /* If we must pass or were requested to pass by reference, do so. - If we were requested to pass by copy, do so. - Otherwise, for foreign conventions, pass In Out or Out parameters - or aggregates by reference. For COBOL and Fortran, pass all - integer and FP types that way too. For Convention Ada, use - the standard Ada default. */ - else if (must_pass_by_ref (gnu_param_type) - || mech == By_Reference - || (mech != By_Copy - && ((foreign - && (!in_param || AGGREGATE_TYPE_P (gnu_param_type))) - || (foreign - && (Convention (gnat_subprog) == Convention_Fortran - || Convention (gnat_subprog) == Convention_COBOL) - && (INTEGRAL_TYPE_P (gnu_param_type) - || FLOAT_TYPE_P (gnu_param_type))) - || (!foreign - && default_pass_by_ref (gnu_param_type))))) - { - /* We take advantage of 6.2(12) by considering that references built for - parameters whose type isn't by-ref and for which the mechanism hasn't - been forced to by-ref are restrict-qualified in the C sense. */ - bool restrict_p - = !TYPE_IS_BY_REFERENCE_P (gnu_param_type) && mech != By_Reference; - gnu_param_type = build_reference_type (gnu_param_type); - if (restrict_p) - gnu_param_type - = build_qualified_type (gnu_param_type, TYPE_QUAL_RESTRICT); - by_ref = true; - - /* In some ABIs, e.g. SPARC 32-bit, fat pointer types are themselves - passed by reference. Pass them by explicit reference, this will - generate more debuggable code at -O0. */ - if (TYPE_IS_FAT_POINTER_P (gnu_param_type) - && targetm.calls.pass_by_reference (pack_cumulative_args (NULL), - TYPE_MODE (gnu_param_type), - gnu_param_type, - true)) - { - gnu_param_type = build_reference_type (gnu_param_type); - by_double_ref = true; - } - } - - /* Pass In Out or Out parameters using copy-in copy-out mechanism. */ - else if (!in_param) - *cico = true; - - if (mech == By_Copy && (by_ref || by_component_ptr)) - post_error ("?cannot pass & by copy", gnat_param); - - /* If this is an Out parameter that isn't passed by reference and isn't - a pointer or aggregate, we don't make a PARM_DECL for it. Instead, - it will be a VAR_DECL created when we process the procedure, so just - return its type. For the special parameter of a valued procedure, - never pass it in. - - An exception is made to cover the RM-6.4.1 rule requiring "by copy" - Out parameters with discriminants or implicit initial values to be - handled like In Out parameters. These type are normally built as - aggregates, hence passed by reference, except for some packed arrays - which end up encoded in special integer types. - - The exception we need to make is then for packed arrays of records - with discriminants or implicit initial values. We have no light/easy - way to check for the latter case, so we merely check for packed arrays - of records. This may lead to useless copy-in operations, but in very - rare cases only, as these would be exceptions in a set of already - exceptional situations. */ - if (Ekind (gnat_param) == E_Out_Parameter - && !by_ref - && (by_return - || (mech != By_Descriptor - && mech != By_Short_Descriptor - && !POINTER_TYPE_P (gnu_param_type) - && !AGGREGATE_TYPE_P (gnu_param_type))) - && !(Is_Array_Type (Etype (gnat_param)) - && Is_Packed (Etype (gnat_param)) - && Is_Composite_Type (Component_Type (Etype (gnat_param))))) - return gnu_param_type; - - gnu_param = create_param_decl (gnu_param_name, gnu_param_type, - ro_param || by_ref || by_component_ptr); - DECL_BY_REF_P (gnu_param) = by_ref; - DECL_BY_DOUBLE_REF_P (gnu_param) = by_double_ref; - DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr; - DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor || - mech == By_Short_Descriptor); - /* Note that, in case of a parameter passed by double reference, the - DECL_POINTS_TO_READONLY_P flag is meant for the second reference. - The first reference always points to read-only, as it points to - the second reference, i.e. the reference to the actual parameter. */ - DECL_POINTS_TO_READONLY_P (gnu_param) - = (ro_param && (by_ref || by_component_ptr)); - DECL_CAN_NEVER_BE_NULL_P (gnu_param) = Can_Never_Be_Null (gnat_param); - - /* Save the alternate descriptor type, if any. */ - if (gnu_param_type_alt) - SET_DECL_PARM_ALT_TYPE (gnu_param, gnu_param_type_alt); - - /* If no Mechanism was specified, indicate what we're using, then - back-annotate it. */ - if (mech == Default) - mech = (by_ref || by_component_ptr) ? By_Reference : By_Copy; - - Set_Mechanism (gnat_param, mech); - return gnu_param; -} - -/* Return true if DISCR1 and DISCR2 represent the same discriminant. */ - -static bool -same_discriminant_p (Entity_Id discr1, Entity_Id discr2) -{ - while (Present (Corresponding_Discriminant (discr1))) - discr1 = Corresponding_Discriminant (discr1); - - while (Present (Corresponding_Discriminant (discr2))) - discr2 = Corresponding_Discriminant (discr2); - - return - Original_Record_Component (discr1) == Original_Record_Component (discr2); -} - -/* Return true if the array type GNU_TYPE, which represents a dimension of - GNAT_TYPE, has a non-aliased component in the back-end sense. */ - -static bool -array_type_has_nonaliased_component (tree gnu_type, Entity_Id gnat_type) -{ - /* If the array type is not the innermost dimension of the GNAT type, - then it has a non-aliased component. */ - if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE - && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type))) - return true; - - /* If the array type has an aliased component in the front-end sense, - then it also has an aliased component in the back-end sense. */ - if (Has_Aliased_Components (gnat_type)) - return false; - - /* If this is a derived type, then it has a non-aliased component if - and only if its parent type also has one. */ - if (Is_Derived_Type (gnat_type)) - { - tree gnu_parent_type = gnat_to_gnu_type (Etype (gnat_type)); - int index; - if (TREE_CODE (gnu_parent_type) == UNCONSTRAINED_ARRAY_TYPE) - gnu_parent_type - = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_parent_type)))); - for (index = Number_Dimensions (gnat_type) - 1; index > 0; index--) - gnu_parent_type = TREE_TYPE (gnu_parent_type); - return TYPE_NONALIASED_COMPONENT (gnu_parent_type); - } - - /* Otherwise, rely exclusively on properties of the element type. */ - return type_for_nonaliased_component_p (TREE_TYPE (gnu_type)); -} - -/* Return true if GNAT_ADDRESS is a value known at compile-time. */ - -static bool -compile_time_known_address_p (Node_Id gnat_address) -{ - /* Catch System'To_Address. */ - if (Nkind (gnat_address) == N_Unchecked_Type_Conversion) - gnat_address = Expression (gnat_address); - - return Compile_Time_Known_Value (gnat_address); -} - -/* Return true if GNAT_RANGE, a N_Range node, cannot be superflat, i.e. if the - inequality HB >= LB-1 is true. LB and HB are the low and high bounds. */ - -static bool -cannot_be_superflat_p (Node_Id gnat_range) -{ - Node_Id gnat_lb = Low_Bound (gnat_range), gnat_hb = High_Bound (gnat_range); - Node_Id scalar_range; - tree gnu_lb, gnu_hb, gnu_lb_minus_one; - - /* If the low bound is not constant, try to find an upper bound. */ - while (Nkind (gnat_lb) != N_Integer_Literal - && (Ekind (Etype (gnat_lb)) == E_Signed_Integer_Subtype - || Ekind (Etype (gnat_lb)) == E_Modular_Integer_Subtype) - && (scalar_range = Scalar_Range (Etype (gnat_lb))) - && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition - || Nkind (scalar_range) == N_Range)) - gnat_lb = High_Bound (scalar_range); - - /* If the high bound is not constant, try to find a lower bound. */ - while (Nkind (gnat_hb) != N_Integer_Literal - && (Ekind (Etype (gnat_hb)) == E_Signed_Integer_Subtype - || Ekind (Etype (gnat_hb)) == E_Modular_Integer_Subtype) - && (scalar_range = Scalar_Range (Etype (gnat_hb))) - && (Nkind (scalar_range) == N_Signed_Integer_Type_Definition - || Nkind (scalar_range) == N_Range)) - gnat_hb = Low_Bound (scalar_range); - - /* If we have failed to find constant bounds, punt. */ - if (Nkind (gnat_lb) != N_Integer_Literal - || Nkind (gnat_hb) != N_Integer_Literal) - return false; - - /* We need at least a signed 64-bit type to catch most cases. */ - gnu_lb = UI_To_gnu (Intval (gnat_lb), sbitsizetype); - gnu_hb = UI_To_gnu (Intval (gnat_hb), sbitsizetype); - if (TREE_OVERFLOW (gnu_lb) || TREE_OVERFLOW (gnu_hb)) - return false; - - /* If the low bound is the smallest integer, nothing can be smaller. */ - gnu_lb_minus_one = size_binop (MINUS_EXPR, gnu_lb, sbitsize_one_node); - if (TREE_OVERFLOW (gnu_lb_minus_one)) - return true; - - return !tree_int_cst_lt (gnu_hb, gnu_lb_minus_one); -} - -/* Return true if GNU_EXPR is (essentially) the address of a CONSTRUCTOR. */ - -static bool -constructor_address_p (tree gnu_expr) -{ - while (TREE_CODE (gnu_expr) == NOP_EXPR - || TREE_CODE (gnu_expr) == CONVERT_EXPR - || TREE_CODE (gnu_expr) == NON_LVALUE_EXPR) - gnu_expr = TREE_OPERAND (gnu_expr, 0); - - return (TREE_CODE (gnu_expr) == ADDR_EXPR - && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == CONSTRUCTOR); -} - -/* Given GNAT_ENTITY, elaborate all expressions that are required to - be elaborated at the point of its definition, but do nothing else. */ - -void -elaborate_entity (Entity_Id gnat_entity) -{ - switch (Ekind (gnat_entity)) - { - case E_Signed_Integer_Subtype: - case E_Modular_Integer_Subtype: - case E_Enumeration_Subtype: - case E_Ordinary_Fixed_Point_Subtype: - case E_Decimal_Fixed_Point_Subtype: - case E_Floating_Point_Subtype: - { - Node_Id gnat_lb = Type_Low_Bound (gnat_entity); - Node_Id gnat_hb = Type_High_Bound (gnat_entity); - - /* ??? Tests to avoid Constraint_Error in static expressions - are needed until after the front stops generating bogus - conversions on bounds of real types. */ - if (!Raises_Constraint_Error (gnat_lb)) - elaborate_expression (gnat_lb, gnat_entity, get_identifier ("L"), - true, false, Needs_Debug_Info (gnat_entity)); - if (!Raises_Constraint_Error (gnat_hb)) - elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"), - true, false, Needs_Debug_Info (gnat_entity)); - break; - } - - case E_Record_Subtype: - case E_Private_Subtype: - case E_Limited_Private_Subtype: - case E_Record_Subtype_With_Private: - if (Has_Discriminants (gnat_entity) && Is_Constrained (gnat_entity)) - { - Node_Id gnat_discriminant_expr; - Entity_Id gnat_field; - - for (gnat_field - = First_Discriminant (Implementation_Base_Type (gnat_entity)), - gnat_discriminant_expr - = First_Elmt (Discriminant_Constraint (gnat_entity)); - Present (gnat_field); - gnat_field = Next_Discriminant (gnat_field), - gnat_discriminant_expr = Next_Elmt (gnat_discriminant_expr)) - /* ??? For now, ignore access discriminants. */ - if (!Is_Access_Type (Etype (Node (gnat_discriminant_expr)))) - elaborate_expression (Node (gnat_discriminant_expr), - gnat_entity, get_entity_name (gnat_field), - true, false, false); - } - break; - - } -} - -/* Return true if the size in units represented by GNU_SIZE can be handled by - an allocation. If STATIC_P is true, consider only what can be done with a - static allocation. */ - -static bool -allocatable_size_p (tree gnu_size, bool static_p) -{ - /* We can allocate a fixed size if it is a valid for the middle-end. */ - if (TREE_CODE (gnu_size) == INTEGER_CST) - return valid_constant_size_p (gnu_size); - - /* We can allocate a variable size if this isn't a static allocation. */ - else - return !static_p; -} - -/* Prepend to ATTR_LIST an entry for an attribute with provided TYPE, - NAME, ARGS and ERROR_POINT. */ - -static void -prepend_one_attribute_to (struct attrib ** attr_list, - enum attr_type attr_type, - tree attr_name, - tree attr_args, - Node_Id attr_error_point) -{ - struct attrib * attr = (struct attrib *) xmalloc (sizeof (struct attrib)); - - attr->type = attr_type; - attr->name = attr_name; - attr->args = attr_args; - attr->error_point = attr_error_point; - - attr->next = *attr_list; - *attr_list = attr; -} - -/* Prepend to ATTR_LIST the list of attributes for GNAT_ENTITY, if any. */ - -static void -prepend_attributes (Entity_Id gnat_entity, struct attrib ** attr_list) -{ - Node_Id gnat_temp; - - /* Attributes are stored as Representation Item pragmas. */ - - for (gnat_temp = First_Rep_Item (gnat_entity); Present (gnat_temp); - gnat_temp = Next_Rep_Item (gnat_temp)) - if (Nkind (gnat_temp) == N_Pragma) - { - tree gnu_arg0 = NULL_TREE, gnu_arg1 = NULL_TREE; - Node_Id gnat_assoc = Pragma_Argument_Associations (gnat_temp); - enum attr_type etype; - - /* Map the kind of pragma at hand. Skip if this is not one - we know how to handle. */ - - switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_temp)))) - { - case Pragma_Machine_Attribute: - etype = ATTR_MACHINE_ATTRIBUTE; - break; - - case Pragma_Linker_Alias: - etype = ATTR_LINK_ALIAS; - break; - - case Pragma_Linker_Section: - etype = ATTR_LINK_SECTION; - break; - - case Pragma_Linker_Constructor: - etype = ATTR_LINK_CONSTRUCTOR; - break; - - case Pragma_Linker_Destructor: - etype = ATTR_LINK_DESTRUCTOR; - break; - - case Pragma_Weak_External: - etype = ATTR_WEAK_EXTERNAL; - break; - - case Pragma_Thread_Local_Storage: - etype = ATTR_THREAD_LOCAL_STORAGE; - break; - - default: - continue; - } - - /* See what arguments we have and turn them into GCC trees for - attribute handlers. These expect identifier for strings. We - handle at most two arguments, static expressions only. */ - - if (Present (gnat_assoc) && Present (First (gnat_assoc))) - { - Node_Id gnat_arg0 = Next (First (gnat_assoc)); - Node_Id gnat_arg1 = Empty; - - if (Present (gnat_arg0) - && Is_Static_Expression (Expression (gnat_arg0))) - { - gnu_arg0 = gnat_to_gnu (Expression (gnat_arg0)); - - if (TREE_CODE (gnu_arg0) == STRING_CST) - gnu_arg0 = get_identifier (TREE_STRING_POINTER (gnu_arg0)); - - gnat_arg1 = Next (gnat_arg0); - } - - if (Present (gnat_arg1) - && Is_Static_Expression (Expression (gnat_arg1))) - { - gnu_arg1 = gnat_to_gnu (Expression (gnat_arg1)); - - if (TREE_CODE (gnu_arg1) == STRING_CST) - gnu_arg1 = get_identifier (TREE_STRING_POINTER (gnu_arg1)); - } - } - - /* Prepend to the list now. Make a list of the argument we might - have, as GCC expects it. */ - prepend_one_attribute_to - (attr_list, - etype, gnu_arg0, - (gnu_arg1 != NULL_TREE) - ? build_tree_list (NULL_TREE, gnu_arg1) : NULL_TREE, - Present (Next (First (gnat_assoc))) - ? Expression (Next (First (gnat_assoc))) : gnat_temp); - } -} - -/* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a - type definition (either a bound or a discriminant value) for GNAT_ENTITY, - return the GCC tree to use for that expression. GNU_NAME is the suffix - to use if a variable needs to be created and DEFINITION is true if this - is a definition of GNAT_ENTITY. If NEED_VALUE is true, we need a result; - otherwise, we are just elaborating the expression for side-effects. If - NEED_DEBUG is true, we need a variable for debugging purposes even if it - isn't needed for code generation. */ - -static tree -elaborate_expression (Node_Id gnat_expr, Entity_Id gnat_entity, tree gnu_name, - bool definition, bool need_value, bool need_debug) -{ - tree gnu_expr; - - /* If we already elaborated this expression (e.g. it was involved - in the definition of a private type), use the old value. */ - if (present_gnu_tree (gnat_expr)) - return get_gnu_tree (gnat_expr); - - /* If we don't need a value and this is static or a discriminant, - we don't need to do anything. */ - if (!need_value - && (Is_OK_Static_Expression (gnat_expr) - || (Nkind (gnat_expr) == N_Identifier - && Ekind (Entity (gnat_expr)) == E_Discriminant))) - return NULL_TREE; - - /* If it's a static expression, we don't need a variable for debugging. */ - if (need_debug && Is_OK_Static_Expression (gnat_expr)) - need_debug = false; - - /* Otherwise, convert this tree to its GCC equivalent and elaborate it. */ - gnu_expr = elaborate_expression_1 (gnat_to_gnu (gnat_expr), gnat_entity, - gnu_name, definition, need_debug); - - /* Save the expression in case we try to elaborate this entity again. Since - it's not a DECL, don't check it. Don't save if it's a discriminant. */ - if (!CONTAINS_PLACEHOLDER_P (gnu_expr)) - save_gnu_tree (gnat_expr, gnu_expr, true); - - return need_value ? gnu_expr : error_mark_node; -} - -/* Similar, but take a GNU expression and always return a result. */ - -static tree -elaborate_expression_1 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name, - bool definition, bool need_debug) -{ - const bool expr_public_p = Is_Public (gnat_entity); - const bool expr_global_p = expr_public_p || global_bindings_p (); - bool expr_variable_p, use_variable; - - /* In most cases, we won't see a naked FIELD_DECL because a discriminant - reference will have been replaced with a COMPONENT_REF when the type - is being elaborated. However, there are some cases involving child - types where we will. So convert it to a COMPONENT_REF. We hope it - will be at the highest level of the expression in these cases. */ - if (TREE_CODE (gnu_expr) == FIELD_DECL) - gnu_expr = build3 (COMPONENT_REF, TREE_TYPE (gnu_expr), - build0 (PLACEHOLDER_EXPR, DECL_CONTEXT (gnu_expr)), - gnu_expr, NULL_TREE); - - /* If GNU_EXPR contains a placeholder, just return it. We rely on the fact - that an expression cannot contain both a discriminant and a variable. */ - if (CONTAINS_PLACEHOLDER_P (gnu_expr)) - return gnu_expr; - - /* If GNU_EXPR is neither a constant nor based on a read-only variable, make - a variable that is initialized to contain the expression when the package - containing the definition is elaborated. If this entity is defined at top - level, replace the expression by the variable; otherwise use a SAVE_EXPR - if this is necessary. */ - if (CONSTANT_CLASS_P (gnu_expr)) - expr_variable_p = false; - else - { - /* Skip any conversions and simple arithmetics to see if the expression - is based on a read-only variable. - ??? This really should remain read-only, but we have to think about - the typing of the tree here. */ - tree inner - = skip_simple_arithmetic (remove_conversions (gnu_expr, true)); - - if (handled_component_p (inner)) - { - HOST_WIDE_INT bitsize, bitpos; - tree offset; - enum machine_mode mode; - int unsignedp, volatilep; - - inner = get_inner_reference (inner, &bitsize, &bitpos, &offset, - &mode, &unsignedp, &volatilep, false); - /* If the offset is variable, err on the side of caution. */ - if (offset) - inner = NULL_TREE; - } - - expr_variable_p - = !(inner - && TREE_CODE (inner) == VAR_DECL - && (TREE_READONLY (inner) || DECL_READONLY_ONCE_ELAB (inner))); - } - - /* We only need to use the variable if we are in a global context since GCC - can do the right thing in the local case. However, when not optimizing, - use it for bounds of loop iteration scheme to avoid code duplication. */ - use_variable = expr_variable_p - && (expr_global_p - || (!optimize - && definition - && Is_Itype (gnat_entity) - && Nkind (Associated_Node_For_Itype (gnat_entity)) - == N_Loop_Parameter_Specification)); - - /* Now create it, possibly only for debugging purposes. */ - if (use_variable || need_debug) - { - tree gnu_decl - = create_var_decl_1 - (create_concat_name (gnat_entity, IDENTIFIER_POINTER (gnu_name)), - NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr, true, expr_public_p, - !definition, expr_global_p, !need_debug, NULL, gnat_entity); - - if (use_variable) - return gnu_decl; - } - - return expr_variable_p ? gnat_save_expr (gnu_expr) : gnu_expr; -} - -/* Similar, but take an alignment factor and make it explicit in the tree. */ - -static tree -elaborate_expression_2 (tree gnu_expr, Entity_Id gnat_entity, tree gnu_name, - bool definition, bool need_debug, unsigned int align) -{ - tree unit_align = size_int (align / BITS_PER_UNIT); - return - size_binop (MULT_EXPR, - elaborate_expression_1 (size_binop (EXACT_DIV_EXPR, - gnu_expr, - unit_align), - gnat_entity, gnu_name, definition, - need_debug), - unit_align); -} - -/* Given a GNU tree and a GNAT list of choices, generate an expression to test - the value passed against the list of choices. */ - -tree -choices_to_gnu (tree operand, Node_Id choices) -{ - Node_Id choice; - Node_Id gnat_temp; - tree result = boolean_false_node; - tree this_test, low = 0, high = 0, single = 0; - - for (choice = First (choices); Present (choice); choice = Next (choice)) - { - switch (Nkind (choice)) - { - case N_Range: - low = gnat_to_gnu (Low_Bound (choice)); - high = gnat_to_gnu (High_Bound (choice)); - - this_test - = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, - build_binary_op (GE_EXPR, boolean_type_node, - operand, low), - build_binary_op (LE_EXPR, boolean_type_node, - operand, high)); - - break; - - case N_Subtype_Indication: - gnat_temp = Range_Expression (Constraint (choice)); - low = gnat_to_gnu (Low_Bound (gnat_temp)); - high = gnat_to_gnu (High_Bound (gnat_temp)); - - this_test - = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, - build_binary_op (GE_EXPR, boolean_type_node, - operand, low), - build_binary_op (LE_EXPR, boolean_type_node, - operand, high)); - break; - - case N_Identifier: - case N_Expanded_Name: - /* This represents either a subtype range, an enumeration - literal, or a constant Ekind says which. If an enumeration - literal or constant, fall through to the next case. */ - if (Ekind (Entity (choice)) != E_Enumeration_Literal - && Ekind (Entity (choice)) != E_Constant) - { - tree type = gnat_to_gnu_type (Entity (choice)); - - low = TYPE_MIN_VALUE (type); - high = TYPE_MAX_VALUE (type); - - this_test - = build_binary_op (TRUTH_ANDIF_EXPR, boolean_type_node, - build_binary_op (GE_EXPR, boolean_type_node, - operand, low), - build_binary_op (LE_EXPR, boolean_type_node, - operand, high)); - break; - } - - /* ... fall through ... */ - - case N_Character_Literal: - case N_Integer_Literal: - single = gnat_to_gnu (choice); - this_test = build_binary_op (EQ_EXPR, boolean_type_node, operand, - single); - break; - - case N_Others_Choice: - this_test = boolean_true_node; - break; - - default: - gcc_unreachable (); - } - - result = build_binary_op (TRUTH_ORIF_EXPR, boolean_type_node, result, - this_test); - } - - return result; -} - -/* Adjust PACKED setting as passed to gnat_to_gnu_field for a field of - type FIELD_TYPE to be placed in RECORD_TYPE. Return the result. */ - -static int -adjust_packed (tree field_type, tree record_type, int packed) -{ - /* If the field contains an item of variable size, we cannot pack it - because we cannot create temporaries of non-fixed size in case - we need to take the address of the field. See addressable_p and - the notes on the addressability issues for further details. */ - if (type_has_variable_size (field_type)) - return 0; - - /* If the alignment of the record is specified and the field type - is over-aligned, request Storage_Unit alignment for the field. */ - if (packed == -2) - { - if (TYPE_ALIGN (field_type) > TYPE_ALIGN (record_type)) - return -1; - else - return 0; - } - - return packed; -} - -/* Return a GCC tree for a field corresponding to GNAT_FIELD to be - placed in GNU_RECORD_TYPE. - - PACKED is 1 if the enclosing record is packed, -1 if the enclosing - record has Component_Alignment of Storage_Unit, -2 if the enclosing - record has a specified alignment. - - DEFINITION is true if this field is for a record being defined. - - DEBUG_INFO_P is true if we need to write debug information for types - that we may create in the process. */ - -static tree -gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed, - bool definition, bool debug_info_p) -{ - const Entity_Id gnat_field_type = Etype (gnat_field); - tree gnu_field_type = gnat_to_gnu_type (gnat_field_type); - tree gnu_field_id = get_entity_name (gnat_field); - tree gnu_field, gnu_size, gnu_pos; - bool is_volatile - = (Treat_As_Volatile (gnat_field) || Treat_As_Volatile (gnat_field_type)); - bool needs_strict_alignment - = (is_volatile - || Is_Aliased (gnat_field) - || Strict_Alignment (gnat_field_type)); - - /* If this field requires strict alignment, we cannot pack it because - it would very likely be under-aligned in the record. */ - if (needs_strict_alignment) - packed = 0; - else - packed = adjust_packed (gnu_field_type, gnu_record_type, packed); - - /* If a size is specified, use it. Otherwise, if the record type is packed, - use the official RM size. See "Handling of Type'Size Values" in Einfo - for further details. */ - if (Known_Esize (gnat_field)) - gnu_size = validate_size (Esize (gnat_field), gnu_field_type, - gnat_field, FIELD_DECL, false, true); - else if (packed == 1) - gnu_size = validate_size (RM_Size (gnat_field_type), gnu_field_type, - gnat_field, FIELD_DECL, false, true); - else - gnu_size = NULL_TREE; - - /* If we have a specified size that is smaller than that of the field's type, - or a position is specified, and the field's type is a record that doesn't - require strict alignment, see if we can get either an integral mode form - of the type or a smaller form. If we can, show a size was specified for - the field if there wasn't one already, so we know to make this a bitfield - and avoid making things wider. - - Changing to an integral mode form is useful when the record is packed as - we can then place the field at a non-byte-aligned position and so achieve - tighter packing. This is in addition required if the field shares a byte - with another field and the front-end lets the back-end handle the access - to the field, because GCC cannot handle non-byte-aligned BLKmode fields. - - Changing to a smaller form is required if the specified size is smaller - than that of the field's type and the type contains sub-fields that are - padded, in order to avoid generating accesses to these sub-fields that - are wider than the field. - - We avoid the transformation if it is not required or potentially useful, - as it might entail an increase of the field's alignment and have ripple - effects on the outer record type. A typical case is a field known to be - byte-aligned and not to share a byte with another field. */ - if (!needs_strict_alignment - && RECORD_OR_UNION_TYPE_P (gnu_field_type) - && !TYPE_FAT_POINTER_P (gnu_field_type) - && host_integerp (TYPE_SIZE (gnu_field_type), 1) - && (packed == 1 - || (gnu_size - && (tree_int_cst_lt (gnu_size, TYPE_SIZE (gnu_field_type)) - || (Present (Component_Clause (gnat_field)) - && !(UI_To_Int (Component_Bit_Offset (gnat_field)) - % BITS_PER_UNIT == 0 - && value_factor_p (gnu_size, BITS_PER_UNIT))))))) - { - tree gnu_packable_type = make_packable_type (gnu_field_type, true); - if (gnu_packable_type != gnu_field_type) - { - gnu_field_type = gnu_packable_type; - if (!gnu_size) - gnu_size = rm_size (gnu_field_type); - } - } - - if (Is_Atomic (gnat_field)) - check_ok_for_atomic (gnu_field_type, gnat_field, false); - - if (Present (Component_Clause (gnat_field))) - { - Entity_Id gnat_parent - = Parent_Subtype (Underlying_Type (Scope (gnat_field))); - - gnu_pos = UI_To_gnu (Component_Bit_Offset (gnat_field), bitsizetype); - gnu_size = validate_size (Esize (gnat_field), gnu_field_type, - gnat_field, FIELD_DECL, false, true); - - /* Ensure the position does not overlap with the parent subtype, if there - is one. This test is omitted if the parent of the tagged type has a - full rep clause since, in this case, component clauses are allowed to - overlay the space allocated for the parent type and the front-end has - checked that there are no overlapping components. */ - if (Present (gnat_parent) && !Is_Fully_Repped_Tagged_Type (gnat_parent)) - { - tree gnu_parent = gnat_to_gnu_type (gnat_parent); - - if (TREE_CODE (TYPE_SIZE (gnu_parent)) == INTEGER_CST - && tree_int_cst_lt (gnu_pos, TYPE_SIZE (gnu_parent))) - { - post_error_ne_tree - ("offset of& must be beyond parent{, minimum allowed is ^}", - First_Bit (Component_Clause (gnat_field)), gnat_field, - TYPE_SIZE_UNIT (gnu_parent)); - } - } - - /* If this field needs strict alignment, check that the record is - sufficiently aligned and that position and size are consistent with - the alignment. But don't do it if we are just annotating types and - the field's type is tagged, since tagged types aren't fully laid out - in this mode. Also, note that atomic implies volatile so the inner - test sequences ordering is significant here. */ - if (needs_strict_alignment - && !(type_annotate_only && Is_Tagged_Type (gnat_field_type))) - { - TYPE_ALIGN (gnu_record_type) - = MAX (TYPE_ALIGN (gnu_record_type), TYPE_ALIGN (gnu_field_type)); - - if (gnu_size - && !operand_equal_p (gnu_size, TYPE_SIZE (gnu_field_type), 0)) - { - if (Is_Atomic (gnat_field) || Is_Atomic (gnat_field_type)) - post_error_ne_tree - ("atomic field& must be natural size of type{ (^)}", - Last_Bit (Component_Clause (gnat_field)), gnat_field, - TYPE_SIZE (gnu_field_type)); - - else if (is_volatile) - post_error_ne_tree - ("volatile field& must be natural size of type{ (^)}", - Last_Bit (Component_Clause (gnat_field)), gnat_field, - TYPE_SIZE (gnu_field_type)); - - else if (Is_Aliased (gnat_field)) - post_error_ne_tree - ("size of aliased field& must be ^ bits", - Last_Bit (Component_Clause (gnat_field)), gnat_field, - TYPE_SIZE (gnu_field_type)); - - else if (Strict_Alignment (gnat_field_type)) - post_error_ne_tree - ("size of & with aliased or tagged components not ^ bits", - Last_Bit (Component_Clause (gnat_field)), gnat_field, - TYPE_SIZE (gnu_field_type)); - - else - gcc_unreachable (); - - gnu_size = NULL_TREE; - } - - if (!integer_zerop (size_binop - (TRUNC_MOD_EXPR, gnu_pos, - bitsize_int (TYPE_ALIGN (gnu_field_type))))) - { - if (Is_Atomic (gnat_field) || Is_Atomic (gnat_field_type)) - post_error_ne_num - ("position of atomic field& must be multiple of ^ bits", - First_Bit (Component_Clause (gnat_field)), gnat_field, - TYPE_ALIGN (gnu_field_type)); - - else if (is_volatile) - post_error_ne_num - ("position of volatile field& must be multiple of ^ bits", - First_Bit (Component_Clause (gnat_field)), gnat_field, - TYPE_ALIGN (gnu_field_type)); - - else if (Is_Aliased (gnat_field)) - post_error_ne_num - ("position of aliased field& must be multiple of ^ bits", - First_Bit (Component_Clause (gnat_field)), gnat_field, - TYPE_ALIGN (gnu_field_type)); - - else if (Strict_Alignment (gnat_field_type)) - post_error_ne - ("position of & is not compatible with alignment required " - "by its components", - First_Bit (Component_Clause (gnat_field)), gnat_field); - - else - gcc_unreachable (); - - gnu_pos = NULL_TREE; - } - } - } - - /* If the record has rep clauses and this is the tag field, make a rep - clause for it as well. */ - else if (Has_Specified_Layout (Scope (gnat_field)) - && Chars (gnat_field) == Name_uTag) - { - gnu_pos = bitsize_zero_node; - gnu_size = TYPE_SIZE (gnu_field_type); - } - - else - { - gnu_pos = NULL_TREE; - - /* If we are packing the record and the field is BLKmode, round the - size up to a byte boundary. */ - if (packed && TYPE_MODE (gnu_field_type) == BLKmode && gnu_size) - gnu_size = round_up (gnu_size, BITS_PER_UNIT); - } - - /* We need to make the size the maximum for the type if it is - self-referential and an unconstrained type. In that case, we can't - pack the field since we can't make a copy to align it. */ - if (TREE_CODE (gnu_field_type) == RECORD_TYPE - && !gnu_size - && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_field_type)) - && !Is_Constrained (Underlying_Type (gnat_field_type))) - { - gnu_size = max_size (TYPE_SIZE (gnu_field_type), true); - packed = 0; - } - - /* If a size is specified, adjust the field's type to it. */ - if (gnu_size) - { - tree orig_field_type; - - /* If the field's type is justified modular, we would need to remove - the wrapper to (better) meet the layout requirements. However we - can do so only if the field is not aliased to preserve the unique - layout and if the prescribed size is not greater than that of the - packed array to preserve the justification. */ - if (!needs_strict_alignment - && TREE_CODE (gnu_field_type) == RECORD_TYPE - && TYPE_JUSTIFIED_MODULAR_P (gnu_field_type) - && tree_int_cst_compare (gnu_size, TYPE_ADA_SIZE (gnu_field_type)) - <= 0) - gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type)); - - /* Similarly if the field's type is a misaligned integral type, but - there is no restriction on the size as there is no justification. */ - if (!needs_strict_alignment - && TYPE_IS_PADDING_P (gnu_field_type) - && INTEGRAL_TYPE_P (TREE_TYPE (TYPE_FIELDS (gnu_field_type)))) - gnu_field_type = TREE_TYPE (TYPE_FIELDS (gnu_field_type)); - - gnu_field_type - = make_type_from_size (gnu_field_type, gnu_size, - Has_Biased_Representation (gnat_field)); - - orig_field_type = gnu_field_type; - gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field, - false, false, definition, true); - - /* If a padding record was made, declare it now since it will never be - declared otherwise. This is necessary to ensure that its subtrees - are properly marked. */ - if (gnu_field_type != orig_field_type - && !DECL_P (TYPE_NAME (gnu_field_type))) - create_type_decl (TYPE_NAME (gnu_field_type), gnu_field_type, NULL, - true, debug_info_p, gnat_field); - } - - /* Otherwise (or if there was an error), don't specify a position. */ - else - gnu_pos = NULL_TREE; - - gcc_assert (TREE_CODE (gnu_field_type) != RECORD_TYPE - || !TYPE_CONTAINS_TEMPLATE_P (gnu_field_type)); - - /* Now create the decl for the field. */ - gnu_field - = create_field_decl (gnu_field_id, gnu_field_type, gnu_record_type, - gnu_size, gnu_pos, packed, Is_Aliased (gnat_field)); - Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field)); - DECL_ALIASED_P (gnu_field) = Is_Aliased (gnat_field); - TREE_THIS_VOLATILE (gnu_field) = TREE_SIDE_EFFECTS (gnu_field) = is_volatile; - - if (Ekind (gnat_field) == E_Discriminant) - DECL_DISCRIMINANT_NUMBER (gnu_field) - = UI_To_gnu (Discriminant_Number (gnat_field), sizetype); - - return gnu_field; -} - -/* Return true if at least one member of COMPONENT_LIST needs strict - alignment. */ - -static bool -components_need_strict_alignment (Node_Id component_list) -{ - Node_Id component_decl; - - for (component_decl = First_Non_Pragma (Component_Items (component_list)); - Present (component_decl); - component_decl = Next_Non_Pragma (component_decl)) - { - Entity_Id gnat_field = Defining_Entity (component_decl); - - if (Is_Aliased (gnat_field)) - return True; - - if (Strict_Alignment (Etype (gnat_field))) - return True; - } - - return False; -} - -/* Return true if TYPE is a type with variable size or a padding type with a - field of variable size or a record that has a field with such a type. */ - -static bool -type_has_variable_size (tree type) -{ - tree field; - - if (!TREE_CONSTANT (TYPE_SIZE (type))) - return true; - - if (TYPE_IS_PADDING_P (type) - && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type)))) - return true; - - if (!RECORD_OR_UNION_TYPE_P (type)) - return false; - - for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field)) - if (type_has_variable_size (TREE_TYPE (field))) - return true; - - return false; -} - -/* Return true if FIELD is an artificial field. */ - -static bool -field_is_artificial (tree field) -{ - /* These fields are generated by the front-end proper. */ - if (IDENTIFIER_POINTER (DECL_NAME (field)) [0] == '_') - return true; - - /* These fields are generated by gigi. */ - if (DECL_INTERNAL_P (field)) - return true; - - return false; -} - -/* Return true if FIELD is a non-artificial aliased field. */ - -static bool -field_is_aliased (tree field) -{ - if (field_is_artificial (field)) - return false; - - return DECL_ALIASED_P (field); -} - -/* Return true if FIELD is a non-artificial field with self-referential - size. */ - -static bool -field_has_self_size (tree field) -{ - if (field_is_artificial (field)) - return false; - - if (DECL_SIZE (field) && TREE_CODE (DECL_SIZE (field)) == INTEGER_CST) - return false; - - return CONTAINS_PLACEHOLDER_P (TYPE_SIZE (TREE_TYPE (field))); -} - -/* Return true if FIELD is a non-artificial field with variable size. */ - -static bool -field_has_variable_size (tree field) -{ - if (field_is_artificial (field)) - return false; - - if (DECL_SIZE (field) && TREE_CODE (DECL_SIZE (field)) == INTEGER_CST) - return false; - - return TREE_CODE (TYPE_SIZE (TREE_TYPE (field))) != INTEGER_CST; -} - -/* qsort comparer for the bit positions of two record components. */ - -static int -compare_field_bitpos (const PTR rt1, const PTR rt2) -{ - const_tree const field1 = * (const_tree const *) rt1; - const_tree const field2 = * (const_tree const *) rt2; - const int ret - = tree_int_cst_compare (bit_position (field1), bit_position (field2)); - - return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2)); -} - -/* Translate and chain the GNAT_COMPONENT_LIST to the GNU_FIELD_LIST, set - the result as the field list of GNU_RECORD_TYPE and finish it up. When - called from gnat_to_gnu_entity during the processing of a record type - definition, the GCC node for the parent, if any, will be the single field - of GNU_RECORD_TYPE and the GCC nodes for the discriminants will be on the - GNU_FIELD_LIST. The other calls to this function are recursive calls for - the component list of a variant and, in this case, GNU_FIELD_LIST is empty. - - PACKED is 1 if this is for a packed record, -1 if this is for a record - with Component_Alignment of Storage_Unit, -2 if this is for a record - with a specified alignment. - - DEFINITION is true if we are defining this record type. - - CANCEL_ALIGNMENT is true if the alignment should be zeroed before laying - out the record. This means the alignment only serves to force fields to - be bitfields, but not to require the record to be that aligned. This is - used for variants. - - ALL_REP is true if a rep clause is present for all the fields. - - UNCHECKED_UNION is true if we are building this type for a record with a - Pragma Unchecked_Union. - - ARTIFICIAL is true if this is a type that was generated by the compiler. - - DEBUG_INFO is true if we need to write debug information about the type. - - MAYBE_UNUSED is true if this type may be unused in the end; this doesn't - mean that its contents may be unused as well, only the container itself. - - REORDER is true if we are permitted to reorder components of this type. - - FIRST_FREE_POS, if nonzero, is the first (lowest) free field position in - the outer record type down to this variant level. It is nonzero only if - all the fields down to this level have a rep clause and ALL_REP is false. - - P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field - with a rep clause is to be added; in this case, that is all that should - be done with such fields. */ - -static void -components_to_record (tree gnu_record_type, Node_Id gnat_component_list, - tree gnu_field_list, int packed, bool definition, - bool cancel_alignment, bool all_rep, - bool unchecked_union, bool artificial, - bool debug_info, bool maybe_unused, bool reorder, - tree first_free_pos, tree *p_gnu_rep_list) -{ - bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type); - bool layout_with_rep = false; - bool has_self_field = false; - bool has_aliased_after_self_field = false; - Node_Id component_decl, variant_part; - tree gnu_field, gnu_next, gnu_last; - tree gnu_rep_part = NULL_TREE; - tree gnu_variant_part = NULL_TREE; - tree gnu_rep_list = NULL_TREE; - tree gnu_var_list = NULL_TREE; - tree gnu_self_list = NULL_TREE; - - /* For each component referenced in a component declaration create a GCC - field and add it to the list, skipping pragmas in the GNAT list. */ - gnu_last = tree_last (gnu_field_list); - if (Present (Component_Items (gnat_component_list))) - for (component_decl - = First_Non_Pragma (Component_Items (gnat_component_list)); - Present (component_decl); - component_decl = Next_Non_Pragma (component_decl)) - { - Entity_Id gnat_field = Defining_Entity (component_decl); - Name_Id gnat_name = Chars (gnat_field); - - /* If present, the _Parent field must have been created as the single - field of the record type. Put it before any other fields. */ - if (gnat_name == Name_uParent) - { - gnu_field = TYPE_FIELDS (gnu_record_type); - gnu_field_list = chainon (gnu_field_list, gnu_field); - } - else - { - gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, packed, - definition, debug_info); - - /* If this is the _Tag field, put it before any other fields. */ - if (gnat_name == Name_uTag) - gnu_field_list = chainon (gnu_field_list, gnu_field); - - /* If this is the _Controller field, put it before the other - fields except for the _Tag or _Parent field. */ - else if (gnat_name == Name_uController && gnu_last) - { - DECL_CHAIN (gnu_field) = DECL_CHAIN (gnu_last); - DECL_CHAIN (gnu_last) = gnu_field; - } - - /* If this is a regular field, put it after the other fields. */ - else - { - DECL_CHAIN (gnu_field) = gnu_field_list; - gnu_field_list = gnu_field; - if (!gnu_last) - gnu_last = gnu_field; - - /* And record information for the final layout. */ - if (field_has_self_size (gnu_field)) - has_self_field = true; - else if (has_self_field && field_is_aliased (gnu_field)) - has_aliased_after_self_field = true; - } - } - - save_gnu_tree (gnat_field, gnu_field, false); - } - - /* At the end of the component list there may be a variant part. */ - variant_part = Variant_Part (gnat_component_list); - - /* We create a QUAL_UNION_TYPE for the variant part since the variants are - mutually exclusive and should go in the same memory. To do this we need - to treat each variant as a record whose elements are created from the - component list for the variant. So here we create the records from the - lists for the variants and put them all into the QUAL_UNION_TYPE. - If this is an Unchecked_Union, we make a UNION_TYPE instead or - use GNU_RECORD_TYPE if there are no fields so far. */ - if (Present (variant_part)) - { - Node_Id gnat_discr = Name (variant_part), variant; - tree gnu_discr = gnat_to_gnu (gnat_discr); - tree gnu_name = TYPE_NAME (gnu_record_type); - tree gnu_var_name - = concat_name (get_identifier (Get_Name_String (Chars (gnat_discr))), - "XVN"); - tree gnu_union_type, gnu_union_name; - tree this_first_free_pos, gnu_variant_list = NULL_TREE; - bool union_field_needs_strict_alignment = false; - - if (TREE_CODE (gnu_name) == TYPE_DECL) - gnu_name = DECL_NAME (gnu_name); - - gnu_union_name - = concat_name (gnu_name, IDENTIFIER_POINTER (gnu_var_name)); - - /* Reuse the enclosing union if this is an Unchecked_Union whose fields - are all in the variant part, to match the layout of C unions. There - is an associated check below. */ - if (TREE_CODE (gnu_record_type) == UNION_TYPE) - gnu_union_type = gnu_record_type; - else - { - gnu_union_type - = make_node (unchecked_union ? UNION_TYPE : QUAL_UNION_TYPE); - - TYPE_NAME (gnu_union_type) = gnu_union_name; - TYPE_ALIGN (gnu_union_type) = 0; - TYPE_PACKED (gnu_union_type) = TYPE_PACKED (gnu_record_type); - } - - /* If all the fields down to this level have a rep clause, find out - whether all the fields at this level also have one. If so, then - compute the new first free position to be passed downward. */ - this_first_free_pos = first_free_pos; - if (this_first_free_pos) - { - for (gnu_field = gnu_field_list; - gnu_field; - gnu_field = DECL_CHAIN (gnu_field)) - if (DECL_FIELD_OFFSET (gnu_field)) - { - tree pos = bit_position (gnu_field); - if (!tree_int_cst_lt (pos, this_first_free_pos)) - this_first_free_pos - = size_binop (PLUS_EXPR, pos, DECL_SIZE (gnu_field)); - } - else - { - this_first_free_pos = NULL_TREE; - break; - } - } - - for (variant = First_Non_Pragma (Variants (variant_part)); - Present (variant); - variant = Next_Non_Pragma (variant)) - { - tree gnu_variant_type = make_node (RECORD_TYPE); - tree gnu_inner_name; - tree gnu_qual; - - Get_Variant_Encoding (variant); - gnu_inner_name = get_identifier_with_length (Name_Buffer, Name_Len); - TYPE_NAME (gnu_variant_type) - = concat_name (gnu_union_name, - IDENTIFIER_POINTER (gnu_inner_name)); - - /* Set the alignment of the inner type in case we need to make - inner objects into bitfields, but then clear it out so the - record actually gets only the alignment required. */ - TYPE_ALIGN (gnu_variant_type) = TYPE_ALIGN (gnu_record_type); - TYPE_PACKED (gnu_variant_type) = TYPE_PACKED (gnu_record_type); - - /* Similarly, if the outer record has a size specified and all - the fields have a rep clause, we can propagate the size. */ - if (all_rep_and_size) - { - TYPE_SIZE (gnu_variant_type) = TYPE_SIZE (gnu_record_type); - TYPE_SIZE_UNIT (gnu_variant_type) - = TYPE_SIZE_UNIT (gnu_record_type); - } - - /* Add the fields into the record type for the variant. Note that - we aren't sure to really use it at this point, see below. */ - components_to_record (gnu_variant_type, Component_List (variant), - NULL_TREE, packed, definition, - !all_rep_and_size, all_rep, unchecked_union, - true, debug_info, true, reorder, - this_first_free_pos, - all_rep || this_first_free_pos - ? NULL : &gnu_rep_list); - - gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant)); - Set_Present_Expr (variant, annotate_value (gnu_qual)); - - /* If this is an Unchecked_Union whose fields are all in the variant - part and we have a single field with no representation clause or - placed at offset zero, use the field directly to match the layout - of C unions. */ - if (TREE_CODE (gnu_record_type) == UNION_TYPE - && (gnu_field = TYPE_FIELDS (gnu_variant_type)) != NULL_TREE - && !DECL_CHAIN (gnu_field) - && (!DECL_FIELD_OFFSET (gnu_field) - || integer_zerop (bit_position (gnu_field)))) - DECL_CONTEXT (gnu_field) = gnu_union_type; - else - { - /* Deal with packedness like in gnat_to_gnu_field. */ - bool field_needs_strict_alignment - = components_need_strict_alignment (Component_List (variant)); - int field_packed; - - if (field_needs_strict_alignment) - { - field_packed = 0; - union_field_needs_strict_alignment = true; - } - else - field_packed - = adjust_packed (gnu_variant_type, gnu_record_type, packed); - - /* Finalize the record type now. We used to throw away - empty records but we no longer do that because we need - them to generate complete debug info for the variant; - otherwise, the union type definition will be lacking - the fields associated with these empty variants. */ - rest_of_record_type_compilation (gnu_variant_type); - create_type_decl (TYPE_NAME (gnu_variant_type), gnu_variant_type, - NULL, true, debug_info, gnat_component_list); - - gnu_field - = create_field_decl (gnu_inner_name, gnu_variant_type, - gnu_union_type, - all_rep_and_size - ? TYPE_SIZE (gnu_variant_type) : 0, - all_rep ? bitsize_zero_node : 0, - field_packed, 0); - - DECL_INTERNAL_P (gnu_field) = 1; - - if (!unchecked_union) - DECL_QUALIFIER (gnu_field) = gnu_qual; - } - - DECL_CHAIN (gnu_field) = gnu_variant_list; - gnu_variant_list = gnu_field; - } - - /* Only make the QUAL_UNION_TYPE if there are non-empty variants. */ - if (gnu_variant_list) - { - int union_field_packed; - - if (all_rep_and_size) - { - TYPE_SIZE (gnu_union_type) = TYPE_SIZE (gnu_record_type); - TYPE_SIZE_UNIT (gnu_union_type) - = TYPE_SIZE_UNIT (gnu_record_type); - } - - finish_record_type (gnu_union_type, nreverse (gnu_variant_list), - all_rep_and_size ? 1 : 0, debug_info); - - /* If GNU_UNION_TYPE is our record type, it means we must have an - Unchecked_Union with no fields. Verify that and, if so, just - return. */ - if (gnu_union_type == gnu_record_type) - { - gcc_assert (unchecked_union - && !gnu_field_list - && !gnu_rep_list); - return; - } - - create_type_decl (TYPE_NAME (gnu_union_type), gnu_union_type, - NULL, true, debug_info, gnat_component_list); - - /* Deal with packedness like in gnat_to_gnu_field. */ - if (union_field_needs_strict_alignment) - union_field_packed = 0; - else - union_field_packed - = adjust_packed (gnu_union_type, gnu_record_type, packed); - - gnu_variant_part - = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type, - all_rep_and_size - ? TYPE_SIZE (gnu_union_type) : 0, - all_rep || this_first_free_pos - ? bitsize_zero_node : 0, - union_field_packed, 0); - - DECL_INTERNAL_P (gnu_variant_part) = 1; - } - } - - /* From now on, a zero FIRST_FREE_POS is totally useless. */ - if (first_free_pos && integer_zerop (first_free_pos)) - first_free_pos = NULL_TREE; - - /* Scan GNU_FIELD_LIST and see if any fields have rep clauses and, if we are - permitted to reorder components, self-referential sizes or variable sizes. - If they do, pull them out and put them onto the appropriate list. We have - to do this in a separate pass since we want to handle the discriminants - but can't play with them until we've used them in debugging data above. - - ??? If we reorder them, debugging information will be wrong but there is - nothing that can be done about this at the moment. */ - gnu_last = NULL_TREE; - -#define MOVE_FROM_FIELD_LIST_TO(LIST) \ - do { \ - if (gnu_last) \ - DECL_CHAIN (gnu_last) = gnu_next; \ - else \ - gnu_field_list = gnu_next; \ - \ - DECL_CHAIN (gnu_field) = (LIST); \ - (LIST) = gnu_field; \ - } while (0) - - for (gnu_field = gnu_field_list; gnu_field; gnu_field = gnu_next) - { - gnu_next = DECL_CHAIN (gnu_field); - - if (DECL_FIELD_OFFSET (gnu_field)) - { - MOVE_FROM_FIELD_LIST_TO (gnu_rep_list); - continue; - } - - if ((reorder || has_aliased_after_self_field) - && field_has_self_size (gnu_field)) - { - MOVE_FROM_FIELD_LIST_TO (gnu_self_list); - continue; - } - - if (reorder && field_has_variable_size (gnu_field)) - { - MOVE_FROM_FIELD_LIST_TO (gnu_var_list); - continue; - } - - gnu_last = gnu_field; - } - -#undef MOVE_FROM_FIELD_LIST_TO - - /* If permitted, we reorder the fields as follows: - - 1) all fixed length fields, - 2) all fields whose length doesn't depend on discriminants, - 3) all fields whose length depends on discriminants, - 4) the variant part, - - within the record and within each variant recursively. */ - if (reorder) - gnu_field_list - = chainon (nreverse (gnu_self_list), - chainon (nreverse (gnu_var_list), gnu_field_list)); - - /* Otherwise, if there is an aliased field placed after a field whose length - depends on discriminants, we put all the fields of the latter sort, last. - We need to do this in case an object of this record type is mutable. */ - else if (has_aliased_after_self_field) - gnu_field_list = chainon (nreverse (gnu_self_list), gnu_field_list); - - /* If P_REP_LIST is nonzero, this means that we are asked to move the fields - in our REP list to the previous level because this level needs them in - order to do a correct layout, i.e. avoid having overlapping fields. */ - if (p_gnu_rep_list && gnu_rep_list) - *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_rep_list); - - /* Otherwise, sort the fields by bit position and put them into their own - record, before the others, if we also have fields without rep clause. */ - else if (gnu_rep_list) - { - tree gnu_rep_type - = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type); - int i, len = list_length (gnu_rep_list); - tree *gnu_arr = XALLOCAVEC (tree, len); - - for (gnu_field = gnu_rep_list, i = 0; - gnu_field; - gnu_field = DECL_CHAIN (gnu_field), i++) - gnu_arr[i] = gnu_field; - - qsort (gnu_arr, len, sizeof (tree), compare_field_bitpos); - - /* Put the fields in the list in order of increasing position, which - means we start from the end. */ - gnu_rep_list = NULL_TREE; - for (i = len - 1; i >= 0; i--) - { - DECL_CHAIN (gnu_arr[i]) = gnu_rep_list; - gnu_rep_list = gnu_arr[i]; - DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type; - } - - if (gnu_field_list) - { - finish_record_type (gnu_rep_type, gnu_rep_list, 1, debug_info); - - /* If FIRST_FREE_POS is nonzero, we need to ensure that the fields - without rep clause are laid out starting from this position. - Therefore, we force it as a minimal size on the REP part. */ - gnu_rep_part - = create_rep_part (gnu_rep_type, gnu_record_type, first_free_pos); - } - else - { - layout_with_rep = true; - gnu_field_list = nreverse (gnu_rep_list); - } - } - - /* If FIRST_FREE_POS is nonzero, we need to ensure that the fields without - rep clause are laid out starting from this position. Therefore, if we - have not already done so, we create a fake REP part with this size. */ - if (first_free_pos && !layout_with_rep && !gnu_rep_part) - { - tree gnu_rep_type = make_node (RECORD_TYPE); - finish_record_type (gnu_rep_type, NULL_TREE, 0, debug_info); - gnu_rep_part - = create_rep_part (gnu_rep_type, gnu_record_type, first_free_pos); - } - - /* Now chain the REP part at the end of the reversed field list. */ - if (gnu_rep_part) - gnu_field_list = chainon (gnu_field_list, gnu_rep_part); - - /* And the variant part at the beginning. */ - if (gnu_variant_part) - { - DECL_CHAIN (gnu_variant_part) = gnu_field_list; - gnu_field_list = gnu_variant_part; - } - - if (cancel_alignment) - TYPE_ALIGN (gnu_record_type) = 0; - - finish_record_type (gnu_record_type, nreverse (gnu_field_list), - layout_with_rep ? 1 : 0, false); - TYPE_ARTIFICIAL (gnu_record_type) = artificial; - if (debug_info && !maybe_unused) - rest_of_record_type_compilation (gnu_record_type); -} - -/* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be - placed into an Esize, Component_Bit_Offset, or Component_Size value - in the GNAT tree. */ - -static Uint -annotate_value (tree gnu_size) -{ - TCode tcode; - Node_Ref_Or_Val ops[3], ret, pre_op1 = No_Uint; - struct tree_int_map in; - int i; - - /* See if we've already saved the value for this node. */ - if (EXPR_P (gnu_size)) - { - struct tree_int_map *e; - - if (!annotate_value_cache) - annotate_value_cache = htab_create_ggc (512, tree_int_map_hash, - tree_int_map_eq, 0); - in.base.from = gnu_size; - e = (struct tree_int_map *) - htab_find (annotate_value_cache, &in); - - if (e) - return (Node_Ref_Or_Val) e->to; - } - else - in.base.from = NULL_TREE; - - /* If we do not return inside this switch, TCODE will be set to the - code to use for a Create_Node operand and LEN (set above) will be - the number of recursive calls for us to make. */ - - switch (TREE_CODE (gnu_size)) - { - case INTEGER_CST: - return TREE_OVERFLOW (gnu_size) ? No_Uint : UI_From_gnu (gnu_size); - - case COMPONENT_REF: - /* The only case we handle here is a simple discriminant reference. */ - if (DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1))) - { - tree n = DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1)); - - /* Climb up the chain of successive extensions, if any. */ - while (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == COMPONENT_REF - && DECL_NAME (TREE_OPERAND (TREE_OPERAND (gnu_size, 0), 1)) - == parent_name_id) - gnu_size = TREE_OPERAND (gnu_size, 0); - - if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR) - return - Create_Node (Discrim_Val, annotate_value (n), No_Uint, No_Uint); - } - - return No_Uint; - - CASE_CONVERT: case NON_LVALUE_EXPR: - return annotate_value (TREE_OPERAND (gnu_size, 0)); - - /* Now just list the operations we handle. */ - case COND_EXPR: tcode = Cond_Expr; break; - case PLUS_EXPR: tcode = Plus_Expr; break; - case MINUS_EXPR: tcode = Minus_Expr; break; - case MULT_EXPR: tcode = Mult_Expr; break; - case TRUNC_DIV_EXPR: tcode = Trunc_Div_Expr; break; - case CEIL_DIV_EXPR: tcode = Ceil_Div_Expr; break; - case FLOOR_DIV_EXPR: tcode = Floor_Div_Expr; break; - case TRUNC_MOD_EXPR: tcode = Trunc_Mod_Expr; break; - case CEIL_MOD_EXPR: tcode = Ceil_Mod_Expr; break; - case FLOOR_MOD_EXPR: tcode = Floor_Mod_Expr; break; - case EXACT_DIV_EXPR: tcode = Exact_Div_Expr; break; - case NEGATE_EXPR: tcode = Negate_Expr; break; - case MIN_EXPR: tcode = Min_Expr; break; - case MAX_EXPR: tcode = Max_Expr; break; - case ABS_EXPR: tcode = Abs_Expr; break; - case TRUTH_ANDIF_EXPR: tcode = Truth_Andif_Expr; break; - case TRUTH_ORIF_EXPR: tcode = Truth_Orif_Expr; break; - case TRUTH_AND_EXPR: tcode = Truth_And_Expr; break; - case TRUTH_OR_EXPR: tcode = Truth_Or_Expr; break; - case TRUTH_XOR_EXPR: tcode = Truth_Xor_Expr; break; - case TRUTH_NOT_EXPR: tcode = Truth_Not_Expr; break; - case LT_EXPR: tcode = Lt_Expr; break; - case LE_EXPR: tcode = Le_Expr; break; - case GT_EXPR: tcode = Gt_Expr; break; - case GE_EXPR: tcode = Ge_Expr; break; - case EQ_EXPR: tcode = Eq_Expr; break; - case NE_EXPR: tcode = Ne_Expr; break; - - case BIT_AND_EXPR: - tcode = Bit_And_Expr; - /* For negative values, build NEGATE_EXPR of the opposite. Such values - appear in expressions containing aligning patterns. Note that, since - sizetype is unsigned, we have to jump through some hoops. */ - if (TREE_CODE (TREE_OPERAND (gnu_size, 1)) == INTEGER_CST) - { - tree op1 = TREE_OPERAND (gnu_size, 1); - double_int signed_op1 - = tree_to_double_int (op1).sext (TYPE_PRECISION (sizetype)); - if (signed_op1.is_negative ()) - { - op1 = double_int_to_tree (sizetype, -signed_op1); - pre_op1 = annotate_value (build1 (NEGATE_EXPR, sizetype, op1)); - } - } - break; - - case CALL_EXPR: - { - tree t = maybe_inline_call_in_expr (gnu_size); - if (t) - return annotate_value (t); - } - - /* Fall through... */ - - default: - return No_Uint; - } - - /* Now get each of the operands that's relevant for this code. If any - cannot be expressed as a repinfo node, say we can't. */ - for (i = 0; i < 3; i++) - ops[i] = No_Uint; - - for (i = 0; i < TREE_CODE_LENGTH (TREE_CODE (gnu_size)); i++) - { - if (i == 1 && pre_op1 != No_Uint) - ops[i] = pre_op1; - else - ops[i] = annotate_value (TREE_OPERAND (gnu_size, i)); - if (ops[i] == No_Uint) - return No_Uint; - } - - ret = Create_Node (tcode, ops[0], ops[1], ops[2]); - - /* Save the result in the cache. */ - if (in.base.from) - { - struct tree_int_map **h; - /* We can't assume the hash table data hasn't moved since the - initial look up, so we have to search again. Allocating and - inserting an entry at that point would be an alternative, but - then we'd better discard the entry if we decided not to cache - it. */ - h = (struct tree_int_map **) - htab_find_slot (annotate_value_cache, &in, INSERT); - gcc_assert (!*h); - *h = ggc_alloc_tree_int_map (); - (*h)->base.from = gnu_size; - (*h)->to = ret; - } - - return ret; -} - -/* Given GNAT_ENTITY, an object (constant, variable, parameter, exception) - and GNU_TYPE, its corresponding GCC type, set Esize and Alignment to the - size and alignment used by Gigi. Prefer SIZE over TYPE_SIZE if non-null. - BY_REF is true if the object is used by reference and BY_DOUBLE_REF is - true if the object is used by double reference. */ - -void -annotate_object (Entity_Id gnat_entity, tree gnu_type, tree size, bool by_ref, - bool by_double_ref) -{ - if (by_ref) - { - if (by_double_ref) - gnu_type = TREE_TYPE (gnu_type); - - if (TYPE_IS_FAT_POINTER_P (gnu_type)) - gnu_type = TYPE_UNCONSTRAINED_ARRAY (gnu_type); - else - gnu_type = TREE_TYPE (gnu_type); - } - - if (Unknown_Esize (gnat_entity)) - { - if (TREE_CODE (gnu_type) == RECORD_TYPE - && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) - size = TYPE_SIZE (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type)))); - else if (!size) - size = TYPE_SIZE (gnu_type); - - if (size) - Set_Esize (gnat_entity, annotate_value (size)); - } - - if (Unknown_Alignment (gnat_entity)) - Set_Alignment (gnat_entity, - UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT)); -} - -/* Return first element of field list whose TREE_PURPOSE is the same as ELEM. - Return NULL_TREE if there is no such element in the list. */ - -static tree -purpose_member_field (const_tree elem, tree list) -{ - while (list) - { - tree field = TREE_PURPOSE (list); - if (SAME_FIELD_P (field, elem)) - return list; - list = TREE_CHAIN (list); - } - return NULL_TREE; -} - -/* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding GCC type, - set Component_Bit_Offset and Esize of the components to the position and - size used by Gigi. */ - -static void -annotate_rep (Entity_Id gnat_entity, tree gnu_type) -{ - Entity_Id gnat_field; - tree gnu_list; - - /* We operate by first making a list of all fields and their position (we - can get the size easily) and then update all the sizes in the tree. */ - gnu_list - = build_position_list (gnu_type, false, size_zero_node, bitsize_zero_node, - BIGGEST_ALIGNMENT, NULL_TREE); - - for (gnat_field = First_Entity (gnat_entity); - Present (gnat_field); - gnat_field = Next_Entity (gnat_field)) - if (Ekind (gnat_field) == E_Component - || (Ekind (gnat_field) == E_Discriminant - && !Is_Unchecked_Union (Scope (gnat_field)))) - { - tree t = purpose_member_field (gnat_to_gnu_field_decl (gnat_field), - gnu_list); - if (t) - { - tree parent_offset; - - /* If we are just annotating types and the type is tagged, the tag - and the parent components are not generated by the front-end so - we need to add the appropriate offset to each component without - representation clause. */ - if (type_annotate_only - && Is_Tagged_Type (gnat_entity) - && No (Component_Clause (gnat_field))) - { - /* For a component appearing in the current extension, the - offset is the size of the parent. */ - if (Is_Derived_Type (gnat_entity) - && Original_Record_Component (gnat_field) == gnat_field) - parent_offset - = UI_To_gnu (Esize (Etype (Base_Type (gnat_entity))), - bitsizetype); - else - parent_offset = bitsize_int (POINTER_SIZE); - - if (TYPE_FIELDS (gnu_type)) - parent_offset - = round_up (parent_offset, - DECL_ALIGN (TYPE_FIELDS (gnu_type))); - } - else - parent_offset = bitsize_zero_node; - - Set_Component_Bit_Offset - (gnat_field, - annotate_value - (size_binop (PLUS_EXPR, - bit_from_pos (TREE_VEC_ELT (TREE_VALUE (t), 0), - TREE_VEC_ELT (TREE_VALUE (t), 2)), - parent_offset))); - - Set_Esize (gnat_field, - annotate_value (DECL_SIZE (TREE_PURPOSE (t)))); - } - else if (Is_Tagged_Type (gnat_entity) && Is_Derived_Type (gnat_entity)) - { - /* If there is no entry, this is an inherited component whose - position is the same as in the parent type. */ - Set_Component_Bit_Offset - (gnat_field, - Component_Bit_Offset (Original_Record_Component (gnat_field))); - - Set_Esize (gnat_field, - Esize (Original_Record_Component (gnat_field))); - } - } -} - -/* Scan all fields in GNU_TYPE and return a TREE_LIST where TREE_PURPOSE is - the FIELD_DECL and TREE_VALUE a TREE_VEC containing the byte position, the - value to be placed into DECL_OFFSET_ALIGN and the bit position. The list - of fields is flattened, except for variant parts if DO_NOT_FLATTEN_VARIANT - is set to true. GNU_POS is to be added to the position, GNU_BITPOS to the - bit position, OFFSET_ALIGN is the present offset alignment. GNU_LIST is a - pre-existing list to be chained to the newly created entries. */ - -static tree -build_position_list (tree gnu_type, bool do_not_flatten_variant, tree gnu_pos, - tree gnu_bitpos, unsigned int offset_align, tree gnu_list) -{ - tree gnu_field; - - for (gnu_field = TYPE_FIELDS (gnu_type); - gnu_field; - gnu_field = DECL_CHAIN (gnu_field)) - { - tree gnu_our_bitpos = size_binop (PLUS_EXPR, gnu_bitpos, - DECL_FIELD_BIT_OFFSET (gnu_field)); - tree gnu_our_offset = size_binop (PLUS_EXPR, gnu_pos, - DECL_FIELD_OFFSET (gnu_field)); - unsigned int our_offset_align - = MIN (offset_align, DECL_OFFSET_ALIGN (gnu_field)); - tree v = make_tree_vec (3); - - TREE_VEC_ELT (v, 0) = gnu_our_offset; - TREE_VEC_ELT (v, 1) = size_int (our_offset_align); - TREE_VEC_ELT (v, 2) = gnu_our_bitpos; - gnu_list = tree_cons (gnu_field, v, gnu_list); - - /* Recurse on internal fields, flattening the nested fields except for - those in the variant part, if requested. */ - if (DECL_INTERNAL_P (gnu_field)) - { - tree gnu_field_type = TREE_TYPE (gnu_field); - if (do_not_flatten_variant - && TREE_CODE (gnu_field_type) == QUAL_UNION_TYPE) - gnu_list - = build_position_list (gnu_field_type, do_not_flatten_variant, - size_zero_node, bitsize_zero_node, - BIGGEST_ALIGNMENT, gnu_list); - else - gnu_list - = build_position_list (gnu_field_type, do_not_flatten_variant, - gnu_our_offset, gnu_our_bitpos, - our_offset_align, gnu_list); - } - } - - return gnu_list; -} - -/* Return a list describing the substitutions needed to reflect the - discriminant substitutions from GNAT_TYPE to GNAT_SUBTYPE. They can - be in any order. The values in an element of the list are in the form - of operands to SUBSTITUTE_IN_EXPR. DEFINITION is true if this is for - a definition of GNAT_SUBTYPE. */ - -static vec<subst_pair> -build_subst_list (Entity_Id gnat_subtype, Entity_Id gnat_type, bool definition) -{ - vec<subst_pair> gnu_list = vNULL; - Entity_Id gnat_discrim; - Node_Id gnat_value; - - for (gnat_discrim = First_Stored_Discriminant (gnat_type), - gnat_value = First_Elmt (Stored_Constraint (gnat_subtype)); - Present (gnat_discrim); - gnat_discrim = Next_Stored_Discriminant (gnat_discrim), - gnat_value = Next_Elmt (gnat_value)) - /* Ignore access discriminants. */ - if (!Is_Access_Type (Etype (Node (gnat_value)))) - { - tree gnu_field = gnat_to_gnu_field_decl (gnat_discrim); - tree replacement = convert (TREE_TYPE (gnu_field), - elaborate_expression - (Node (gnat_value), gnat_subtype, - get_entity_name (gnat_discrim), - definition, true, false)); - subst_pair s = {gnu_field, replacement}; - gnu_list.safe_push (s); - } - - return gnu_list; -} - -/* Scan all fields in QUAL_UNION_TYPE and return a list describing the - variants of QUAL_UNION_TYPE that are still relevant after applying - the substitutions described in SUBST_LIST. GNU_LIST is a pre-existing - list to be prepended to the newly created entries. */ - -static vec<variant_desc> -build_variant_list (tree qual_union_type, vec<subst_pair> subst_list, - vec<variant_desc> gnu_list) -{ - tree gnu_field; - - for (gnu_field = TYPE_FIELDS (qual_union_type); - gnu_field; - gnu_field = DECL_CHAIN (gnu_field)) - { - tree qual = DECL_QUALIFIER (gnu_field); - unsigned int i; - subst_pair *s; - - FOR_EACH_VEC_ELT (subst_list, i, s) - qual = SUBSTITUTE_IN_EXPR (qual, s->discriminant, s->replacement); - - /* If the new qualifier is not unconditionally false, its variant may - still be accessed. */ - if (!integer_zerop (qual)) - { - tree variant_type = TREE_TYPE (gnu_field), variant_subpart; - variant_desc v = {variant_type, gnu_field, qual, NULL_TREE}; - - gnu_list.safe_push (v); - - /* Recurse on the variant subpart of the variant, if any. */ - variant_subpart = get_variant_part (variant_type); - if (variant_subpart) - gnu_list = build_variant_list (TREE_TYPE (variant_subpart), - subst_list, gnu_list); - - /* If the new qualifier is unconditionally true, the subsequent - variants cannot be accessed. */ - if (integer_onep (qual)) - break; - } - } - - return gnu_list; -} - -/* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE - corresponding to GNAT_OBJECT. If the size is valid, return an INTEGER_CST - corresponding to its value. Otherwise, return NULL_TREE. KIND is set to - VAR_DECL if we are specifying the size of an object, TYPE_DECL for the - size of a type, and FIELD_DECL for the size of a field. COMPONENT_P is - true if we are being called to process the Component_Size of GNAT_OBJECT; - this is used only for error messages. ZERO_OK is true if a size of zero - is permitted; if ZERO_OK is false, it means that a size of zero should be - treated as an unspecified size. */ - -static tree -validate_size (Uint uint_size, tree gnu_type, Entity_Id gnat_object, - enum tree_code kind, bool component_p, bool zero_ok) -{ - Node_Id gnat_error_node; - tree type_size, size; - - /* Return 0 if no size was specified. */ - if (uint_size == No_Uint) - return NULL_TREE; - - /* Ignore a negative size since that corresponds to our back-annotation. */ - if (UI_Lt (uint_size, Uint_0)) - return NULL_TREE; - - /* Find the node to use for error messages. */ - if ((Ekind (gnat_object) == E_Component - || Ekind (gnat_object) == E_Discriminant) - && Present (Component_Clause (gnat_object))) - gnat_error_node = Last_Bit (Component_Clause (gnat_object)); - else if (Present (Size_Clause (gnat_object))) - gnat_error_node = Expression (Size_Clause (gnat_object)); - else - gnat_error_node = gnat_object; - - /* Get the size as an INTEGER_CST. Issue an error if a size was specified - but cannot be represented in bitsizetype. */ - size = UI_To_gnu (uint_size, bitsizetype); - if (TREE_OVERFLOW (size)) - { - if (component_p) - post_error_ne ("component size for& is too large", gnat_error_node, - gnat_object); - else - post_error_ne ("size for& is too large", gnat_error_node, - gnat_object); - return NULL_TREE; - } - - /* Ignore a zero size if it is not permitted. */ - if (!zero_ok && integer_zerop (size)) - return NULL_TREE; - - /* The size of objects is always a multiple of a byte. */ - if (kind == VAR_DECL - && !integer_zerop (size_binop (TRUNC_MOD_EXPR, size, bitsize_unit_node))) - { - if (component_p) - post_error_ne ("component size for& is not a multiple of Storage_Unit", - gnat_error_node, gnat_object); - else - post_error_ne ("size for& is not a multiple of Storage_Unit", - gnat_error_node, gnat_object); - return NULL_TREE; - } - - /* If this is an integral type or a packed array type, the front-end has - already verified the size, so we need not do it here (which would mean - checking against the bounds). However, if this is an aliased object, - it may not be smaller than the type of the object. */ - if ((INTEGRAL_TYPE_P (gnu_type) || TYPE_IS_PACKED_ARRAY_TYPE_P (gnu_type)) - && !(kind == VAR_DECL && Is_Aliased (gnat_object))) - return size; - - /* If the object is a record that contains a template, add the size of the - template to the specified size. */ - if (TREE_CODE (gnu_type) == RECORD_TYPE - && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) - size = size_binop (PLUS_EXPR, DECL_SIZE (TYPE_FIELDS (gnu_type)), size); - - if (kind == VAR_DECL - /* If a type needs strict alignment, a component of this type in - a packed record cannot be packed and thus uses the type size. */ - || (kind == TYPE_DECL && Strict_Alignment (gnat_object))) - type_size = TYPE_SIZE (gnu_type); - else - type_size = rm_size (gnu_type); - - /* Modify the size of a discriminated type to be the maximum size. */ - if (type_size && CONTAINS_PLACEHOLDER_P (type_size)) - type_size = max_size (type_size, true); - - /* If this is an access type or a fat pointer, the minimum size is that given - by the smallest integral mode that's valid for pointers. */ - if (TREE_CODE (gnu_type) == POINTER_TYPE || TYPE_IS_FAT_POINTER_P (gnu_type)) - { - enum machine_mode p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT); - while (!targetm.valid_pointer_mode (p_mode)) - p_mode = GET_MODE_WIDER_MODE (p_mode); - type_size = bitsize_int (GET_MODE_BITSIZE (p_mode)); - } - - /* Issue an error either if the default size of the object isn't a constant - or if the new size is smaller than it. */ - if (TREE_CODE (type_size) != INTEGER_CST - || TREE_OVERFLOW (type_size) - || tree_int_cst_lt (size, type_size)) - { - if (component_p) - post_error_ne_tree - ("component size for& too small{, minimum allowed is ^}", - gnat_error_node, gnat_object, type_size); - else - post_error_ne_tree - ("size for& too small{, minimum allowed is ^}", - gnat_error_node, gnat_object, type_size); - return NULL_TREE; - } - - return size; -} - -/* Similarly, but both validate and process a value of RM size. This routine - is only called for types. */ - -static void -set_rm_size (Uint uint_size, tree gnu_type, Entity_Id gnat_entity) -{ - Node_Id gnat_attr_node; - tree old_size, size; - - /* Do nothing if no size was specified. */ - if (uint_size == No_Uint) - return; - - /* Ignore a negative size since that corresponds to our back-annotation. */ - if (UI_Lt (uint_size, Uint_0)) - return; - - /* Only issue an error if a Value_Size clause was explicitly given. - Otherwise, we'd be duplicating an error on the Size clause. */ - gnat_attr_node - = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size); - - /* Get the size as an INTEGER_CST. Issue an error if a size was specified - but cannot be represented in bitsizetype. */ - size = UI_To_gnu (uint_size, bitsizetype); - if (TREE_OVERFLOW (size)) - { - if (Present (gnat_attr_node)) - post_error_ne ("Value_Size for& is too large", gnat_attr_node, - gnat_entity); - return; - } - - /* Ignore a zero size unless a Value_Size clause exists, or a size clause - exists, or this is an integer type, in which case the front-end will - have always set it. */ - if (No (gnat_attr_node) - && integer_zerop (size) - && !Has_Size_Clause (gnat_entity) - && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity)) - return; - - old_size = rm_size (gnu_type); - - /* If the old size is self-referential, get the maximum size. */ - if (CONTAINS_PLACEHOLDER_P (old_size)) - old_size = max_size (old_size, true); - - /* Issue an error either if the old size of the object isn't a constant or - if the new size is smaller than it. The front-end has already verified - this for scalar and packed array types. */ - if (TREE_CODE (old_size) != INTEGER_CST - || TREE_OVERFLOW (old_size) - || (AGGREGATE_TYPE_P (gnu_type) - && !(TREE_CODE (gnu_type) == ARRAY_TYPE - && TYPE_PACKED_ARRAY_TYPE_P (gnu_type)) - && !(TYPE_IS_PADDING_P (gnu_type) - && TREE_CODE (TREE_TYPE (TYPE_FIELDS (gnu_type))) == ARRAY_TYPE - && TYPE_PACKED_ARRAY_TYPE_P - (TREE_TYPE (TYPE_FIELDS (gnu_type)))) - && tree_int_cst_lt (size, old_size))) - { - if (Present (gnat_attr_node)) - post_error_ne_tree - ("Value_Size for& too small{, minimum allowed is ^}", - gnat_attr_node, gnat_entity, old_size); - return; - } - - /* Otherwise, set the RM size proper for integral types... */ - if ((TREE_CODE (gnu_type) == INTEGER_TYPE - && Is_Discrete_Or_Fixed_Point_Type (gnat_entity)) - || (TREE_CODE (gnu_type) == ENUMERAL_TYPE - || TREE_CODE (gnu_type) == BOOLEAN_TYPE)) - SET_TYPE_RM_SIZE (gnu_type, size); - - /* ...or the Ada size for record and union types. */ - else if (RECORD_OR_UNION_TYPE_P (gnu_type) - && !TYPE_FAT_POINTER_P (gnu_type)) - SET_TYPE_ADA_SIZE (gnu_type, size); -} - -/* ALIGNMENT is a Uint giving the alignment specified for GNAT_ENTITY, - a type or object whose present alignment is ALIGN. If this alignment is - valid, return it. Otherwise, give an error and return ALIGN. */ - -static unsigned int -validate_alignment (Uint alignment, Entity_Id gnat_entity, unsigned int align) -{ - unsigned int max_allowed_alignment = get_target_maximum_allowed_alignment (); - unsigned int new_align; - Node_Id gnat_error_node; - - /* Don't worry about checking alignment if alignment was not specified - by the source program and we already posted an error for this entity. */ - if (Error_Posted (gnat_entity) && !Has_Alignment_Clause (gnat_entity)) - return align; - - /* Post the error on the alignment clause if any. Note, for the implicit - base type of an array type, the alignment clause is on the first - subtype. */ - if (Present (Alignment_Clause (gnat_entity))) - gnat_error_node = Expression (Alignment_Clause (gnat_entity)); - - else if (Is_Itype (gnat_entity) - && Is_Array_Type (gnat_entity) - && Etype (gnat_entity) == gnat_entity - && Present (Alignment_Clause (First_Subtype (gnat_entity)))) - gnat_error_node = - Expression (Alignment_Clause (First_Subtype (gnat_entity))); - - else - gnat_error_node = gnat_entity; - - /* Within GCC, an alignment is an integer, so we must make sure a value is - specified that fits in that range. Also, there is an upper bound to - alignments we can support/allow. */ - if (!UI_Is_In_Int_Range (alignment) - || ((new_align = UI_To_Int (alignment)) > max_allowed_alignment)) - post_error_ne_num ("largest supported alignment for& is ^", - gnat_error_node, gnat_entity, max_allowed_alignment); - else if (!(Present (Alignment_Clause (gnat_entity)) - && From_At_Mod (Alignment_Clause (gnat_entity))) - && new_align * BITS_PER_UNIT < align) - { - unsigned int double_align; - bool is_capped_double, align_clause; - - /* If the default alignment of "double" or larger scalar types is - specifically capped and the new alignment is above the cap, do - not post an error and change the alignment only if there is an - alignment clause; this makes it possible to have the associated - GCC type overaligned by default for performance reasons. */ - if ((double_align = double_float_alignment) > 0) - { - Entity_Id gnat_type - = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity); - is_capped_double - = is_double_float_or_array (gnat_type, &align_clause); - } - else if ((double_align = double_scalar_alignment) > 0) - { - Entity_Id gnat_type - = Is_Type (gnat_entity) ? gnat_entity : Etype (gnat_entity); - is_capped_double - = is_double_scalar_or_array (gnat_type, &align_clause); - } - else - is_capped_double = align_clause = false; - - if (is_capped_double && new_align >= double_align) - { - if (align_clause) - align = new_align * BITS_PER_UNIT; - } - else - { - if (is_capped_double) - align = double_align * BITS_PER_UNIT; - - post_error_ne_num ("alignment for& must be at least ^", - gnat_error_node, gnat_entity, - align / BITS_PER_UNIT); - } - } - else - { - new_align = (new_align > 0 ? new_align * BITS_PER_UNIT : 1); - if (new_align > align) - align = new_align; - } - - return align; -} - -/* Verify that OBJECT, a type or decl, is something we can implement - atomically. If not, give an error for GNAT_ENTITY. COMP_P is true - if we require atomic components. */ - -static void -check_ok_for_atomic (tree object, Entity_Id gnat_entity, bool comp_p) -{ - Node_Id gnat_error_point = gnat_entity; - Node_Id gnat_node; - enum machine_mode mode; - unsigned int align; - tree size; - - /* There are three case of what OBJECT can be. It can be a type, in which - case we take the size, alignment and mode from the type. It can be a - declaration that was indirect, in which case the relevant values are - that of the type being pointed to, or it can be a normal declaration, - in which case the values are of the decl. The code below assumes that - OBJECT is either a type or a decl. */ - if (TYPE_P (object)) - { - /* If this is an anonymous base type, nothing to check. Error will be - reported on the source type. */ - if (!Comes_From_Source (gnat_entity)) - return; - - mode = TYPE_MODE (object); - align = TYPE_ALIGN (object); - size = TYPE_SIZE (object); - } - else if (DECL_BY_REF_P (object)) - { - mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (object))); - align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (object))); - size = TYPE_SIZE (TREE_TYPE (TREE_TYPE (object))); - } - else - { - mode = DECL_MODE (object); - align = DECL_ALIGN (object); - size = DECL_SIZE (object); - } - - /* Consider all floating-point types atomic and any types that that are - represented by integers no wider than a machine word. */ - if (GET_MODE_CLASS (mode) == MODE_FLOAT - || ((GET_MODE_CLASS (mode) == MODE_INT - || GET_MODE_CLASS (mode) == MODE_PARTIAL_INT) - && GET_MODE_BITSIZE (mode) <= BITS_PER_WORD)) - return; - - /* For the moment, also allow anything that has an alignment equal - to its size and which is smaller than a word. */ - if (size && TREE_CODE (size) == INTEGER_CST - && compare_tree_int (size, align) == 0 - && align <= BITS_PER_WORD) - return; - - for (gnat_node = First_Rep_Item (gnat_entity); Present (gnat_node); - gnat_node = Next_Rep_Item (gnat_node)) - { - if (!comp_p && Nkind (gnat_node) == N_Pragma - && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node))) - == Pragma_Atomic)) - gnat_error_point = First (Pragma_Argument_Associations (gnat_node)); - else if (comp_p && Nkind (gnat_node) == N_Pragma - && (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node))) - == Pragma_Atomic_Components)) - gnat_error_point = First (Pragma_Argument_Associations (gnat_node)); - } - - if (comp_p) - post_error_ne ("atomic access to component of & cannot be guaranteed", - gnat_error_point, gnat_entity); - else - post_error_ne ("atomic access to & cannot be guaranteed", - gnat_error_point, gnat_entity); -} - - -/* Helper for the intrin compatibility checks family. Evaluate whether - two types are definitely incompatible. */ - -static bool -intrin_types_incompatible_p (tree t1, tree t2) -{ - enum tree_code code; - - if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) - return false; - - if (TYPE_MODE (t1) != TYPE_MODE (t2)) - return true; - - if (TREE_CODE (t1) != TREE_CODE (t2)) - return true; - - code = TREE_CODE (t1); - - switch (code) - { - case INTEGER_TYPE: - case REAL_TYPE: - return TYPE_PRECISION (t1) != TYPE_PRECISION (t2); - - case POINTER_TYPE: - case REFERENCE_TYPE: - /* Assume designated types are ok. We'd need to account for char * and - void * variants to do better, which could rapidly get messy and isn't - clearly worth the effort. */ - return false; - - default: - break; - } - - return false; -} - -/* Helper for intrin_profiles_compatible_p, to perform compatibility checks - on the Ada/builtin argument lists for the INB binding. */ - -static bool -intrin_arglists_compatible_p (intrin_binding_t * inb) -{ - function_args_iterator ada_iter, btin_iter; - - function_args_iter_init (&ada_iter, inb->ada_fntype); - function_args_iter_init (&btin_iter, inb->btin_fntype); - - /* Sequence position of the last argument we checked. */ - int argpos = 0; - - while (1) - { - tree ada_type = function_args_iter_cond (&ada_iter); - tree btin_type = function_args_iter_cond (&btin_iter); - - /* If we've exhausted both lists simultaneously, we're done. */ - if (ada_type == NULL_TREE && btin_type == NULL_TREE) - break; - - /* If one list is shorter than the other, they fail to match. */ - if (ada_type == NULL_TREE || btin_type == NULL_TREE) - return false; - - /* If we're done with the Ada args and not with the internal builtin - args, or the other way around, complain. */ - if (ada_type == void_type_node - && btin_type != void_type_node) - { - post_error ("?Ada arguments list too short!", inb->gnat_entity); - return false; - } - - if (btin_type == void_type_node - && ada_type != void_type_node) - { - post_error_ne_num ("?Ada arguments list too long ('> ^)!", - inb->gnat_entity, inb->gnat_entity, argpos); - return false; - } - - /* Otherwise, check that types match for the current argument. */ - argpos ++; - if (intrin_types_incompatible_p (ada_type, btin_type)) - { - post_error_ne_num ("?intrinsic binding type mismatch on argument ^!", - inb->gnat_entity, inb->gnat_entity, argpos); - return false; - } - - - function_args_iter_next (&ada_iter); - function_args_iter_next (&btin_iter); - } - - return true; -} - -/* Helper for intrin_profiles_compatible_p, to perform compatibility checks - on the Ada/builtin return values for the INB binding. */ - -static bool -intrin_return_compatible_p (intrin_binding_t * inb) -{ - tree ada_return_type = TREE_TYPE (inb->ada_fntype); - tree btin_return_type = TREE_TYPE (inb->btin_fntype); - - /* Accept function imported as procedure, common and convenient. */ - if (VOID_TYPE_P (ada_return_type) - && !VOID_TYPE_P (btin_return_type)) - return true; - - /* If return type is Address (integer type), map it to void *. */ - if (Is_Descendent_Of_Address (Etype (inb->gnat_entity))) - ada_return_type = ptr_void_type_node; - - /* Check return types compatibility otherwise. Note that this - handles void/void as well. */ - if (intrin_types_incompatible_p (btin_return_type, ada_return_type)) - { - post_error ("?intrinsic binding type mismatch on return value!", - inb->gnat_entity); - return false; - } - - return true; -} - -/* Check and return whether the Ada and gcc builtin profiles bound by INB are - compatible. Issue relevant warnings when they are not. - - This is intended as a light check to diagnose the most obvious cases, not - as a full fledged type compatibility predicate. It is the programmer's - responsibility to ensure correctness of the Ada declarations in Imports, - especially when binding straight to a compiler internal. */ - -static bool -intrin_profiles_compatible_p (intrin_binding_t * inb) -{ - /* Check compatibility on return values and argument lists, each responsible - for posting warnings as appropriate. Ensure use of the proper sloc for - this purpose. */ - - bool arglists_compatible_p, return_compatible_p; - location_t saved_location = input_location; - - Sloc_to_locus (Sloc (inb->gnat_entity), &input_location); - - return_compatible_p = intrin_return_compatible_p (inb); - arglists_compatible_p = intrin_arglists_compatible_p (inb); - - input_location = saved_location; - - return return_compatible_p && arglists_compatible_p; -} - -/* Return a FIELD_DECL node modeled on OLD_FIELD. FIELD_TYPE is its type - and RECORD_TYPE is the type of the parent. If SIZE is nonzero, it is the - specified size for this field. POS_LIST is a position list describing - the layout of OLD_FIELD and SUBST_LIST a substitution list to be applied - to this layout. */ - -static tree -create_field_decl_from (tree old_field, tree field_type, tree record_type, - tree size, tree pos_list, - vec<subst_pair> subst_list) -{ - tree t = TREE_VALUE (purpose_member (old_field, pos_list)); - tree pos = TREE_VEC_ELT (t, 0), bitpos = TREE_VEC_ELT (t, 2); - unsigned int offset_align = tree_low_cst (TREE_VEC_ELT (t, 1), 1); - tree new_pos, new_field; - unsigned int i; - subst_pair *s; - - if (CONTAINS_PLACEHOLDER_P (pos)) - FOR_EACH_VEC_ELT (subst_list, i, s) - pos = SUBSTITUTE_IN_EXPR (pos, s->discriminant, s->replacement); - - /* If the position is now a constant, we can set it as the position of the - field when we make it. Otherwise, we need to deal with it specially. */ - if (TREE_CONSTANT (pos)) - new_pos = bit_from_pos (pos, bitpos); - else - new_pos = NULL_TREE; - - new_field - = create_field_decl (DECL_NAME (old_field), field_type, record_type, - size, new_pos, DECL_PACKED (old_field), - !DECL_NONADDRESSABLE_P (old_field)); - - if (!new_pos) - { - normalize_offset (&pos, &bitpos, offset_align); - DECL_FIELD_OFFSET (new_field) = pos; - DECL_FIELD_BIT_OFFSET (new_field) = bitpos; - SET_DECL_OFFSET_ALIGN (new_field, offset_align); - DECL_SIZE (new_field) = size; - DECL_SIZE_UNIT (new_field) - = convert (sizetype, - size_binop (CEIL_DIV_EXPR, size, bitsize_unit_node)); - layout_decl (new_field, DECL_OFFSET_ALIGN (new_field)); - } - - DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field); - SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field); - DECL_DISCRIMINANT_NUMBER (new_field) = DECL_DISCRIMINANT_NUMBER (old_field); - TREE_THIS_VOLATILE (new_field) = TREE_THIS_VOLATILE (old_field); - - return new_field; -} - -/* Create the REP part of RECORD_TYPE with REP_TYPE. If MIN_SIZE is nonzero, - it is the minimal size the REP_PART must have. */ - -static tree -create_rep_part (tree rep_type, tree record_type, tree min_size) -{ - tree field; - - if (min_size && !tree_int_cst_lt (TYPE_SIZE (rep_type), min_size)) - min_size = NULL_TREE; - - field = create_field_decl (get_identifier ("REP"), rep_type, record_type, - min_size, bitsize_zero_node, 0, 1); - DECL_INTERNAL_P (field) = 1; - - return field; -} - -/* Return the REP part of RECORD_TYPE, if any. Otherwise return NULL. */ - -static tree -get_rep_part (tree record_type) -{ - tree field = TYPE_FIELDS (record_type); - - /* The REP part is the first field, internal, another record, and its name - starts with an 'R'. */ - if (field - && DECL_INTERNAL_P (field) - && TREE_CODE (TREE_TYPE (field)) == RECORD_TYPE - && IDENTIFIER_POINTER (DECL_NAME (field)) [0] == 'R') - return field; - - return NULL_TREE; -} - -/* Return the variant part of RECORD_TYPE, if any. Otherwise return NULL. */ - -tree -get_variant_part (tree record_type) -{ - tree field; - - /* The variant part is the only internal field that is a qualified union. */ - for (field = TYPE_FIELDS (record_type); field; field = DECL_CHAIN (field)) - if (DECL_INTERNAL_P (field) - && TREE_CODE (TREE_TYPE (field)) == QUAL_UNION_TYPE) - return field; - - return NULL_TREE; -} - -/* Return a new variant part modeled on OLD_VARIANT_PART. VARIANT_LIST is - the list of variants to be used and RECORD_TYPE is the type of the parent. - POS_LIST is a position list describing the layout of fields present in - OLD_VARIANT_PART and SUBST_LIST a substitution list to be applied to this - layout. */ - -static tree -create_variant_part_from (tree old_variant_part, - vec<variant_desc> variant_list, - tree record_type, tree pos_list, - vec<subst_pair> subst_list) -{ - tree offset = DECL_FIELD_OFFSET (old_variant_part); - tree old_union_type = TREE_TYPE (old_variant_part); - tree new_union_type, new_variant_part; - tree union_field_list = NULL_TREE; - variant_desc *v; - unsigned int i; - - /* First create the type of the variant part from that of the old one. */ - new_union_type = make_node (QUAL_UNION_TYPE); - TYPE_NAME (new_union_type) - = concat_name (TYPE_NAME (record_type), - IDENTIFIER_POINTER (DECL_NAME (old_variant_part))); - - /* If the position of the variant part is constant, subtract it from the - size of the type of the parent to get the new size. This manual CSE - reduces the code size when not optimizing. */ - if (TREE_CODE (offset) == INTEGER_CST) - { - tree bitpos = DECL_FIELD_BIT_OFFSET (old_variant_part); - tree first_bit = bit_from_pos (offset, bitpos); - TYPE_SIZE (new_union_type) - = size_binop (MINUS_EXPR, TYPE_SIZE (record_type), first_bit); - TYPE_SIZE_UNIT (new_union_type) - = size_binop (MINUS_EXPR, TYPE_SIZE_UNIT (record_type), - byte_from_pos (offset, bitpos)); - SET_TYPE_ADA_SIZE (new_union_type, - size_binop (MINUS_EXPR, TYPE_ADA_SIZE (record_type), - first_bit)); - TYPE_ALIGN (new_union_type) = TYPE_ALIGN (old_union_type); - relate_alias_sets (new_union_type, old_union_type, ALIAS_SET_COPY); - } - else - copy_and_substitute_in_size (new_union_type, old_union_type, subst_list); - - /* Now finish up the new variants and populate the union type. */ - FOR_EACH_VEC_ELT_REVERSE (variant_list, i, v) - { - tree old_field = v->field, new_field; - tree old_variant, old_variant_subpart, new_variant, field_list; - - /* Skip variants that don't belong to this nesting level. */ - if (DECL_CONTEXT (old_field) != old_union_type) - continue; - - /* Retrieve the list of fields already added to the new variant. */ - new_variant = v->new_type; - field_list = TYPE_FIELDS (new_variant); - - /* If the old variant had a variant subpart, we need to create a new - variant subpart and add it to the field list. */ - old_variant = v->type; - old_variant_subpart = get_variant_part (old_variant); - if (old_variant_subpart) - { - tree new_variant_subpart - = create_variant_part_from (old_variant_subpart, variant_list, - new_variant, pos_list, subst_list); - DECL_CHAIN (new_variant_subpart) = field_list; - field_list = new_variant_subpart; - } - - /* Finish up the new variant and create the field. No need for debug - info thanks to the XVS type. */ - finish_record_type (new_variant, nreverse (field_list), 2, false); - compute_record_mode (new_variant); - create_type_decl (TYPE_NAME (new_variant), new_variant, NULL, - true, false, Empty); - - new_field - = create_field_decl_from (old_field, new_variant, new_union_type, - TYPE_SIZE (new_variant), - pos_list, subst_list); - DECL_QUALIFIER (new_field) = v->qual; - DECL_INTERNAL_P (new_field) = 1; - DECL_CHAIN (new_field) = union_field_list; - union_field_list = new_field; - } - - /* Finish up the union type and create the variant part. No need for debug - info thanks to the XVS type. Note that we don't reverse the field list - because VARIANT_LIST has been traversed in reverse order. */ - finish_record_type (new_union_type, union_field_list, 2, false); - compute_record_mode (new_union_type); - create_type_decl (TYPE_NAME (new_union_type), new_union_type, NULL, - true, false, Empty); - - new_variant_part - = create_field_decl_from (old_variant_part, new_union_type, record_type, - TYPE_SIZE (new_union_type), - pos_list, subst_list); - DECL_INTERNAL_P (new_variant_part) = 1; - - /* With multiple discriminants it is possible for an inner variant to be - statically selected while outer ones are not; in this case, the list - of fields of the inner variant is not flattened and we end up with a - qualified union with a single member. Drop the useless container. */ - if (!DECL_CHAIN (union_field_list)) - { - DECL_CONTEXT (union_field_list) = record_type; - DECL_FIELD_OFFSET (union_field_list) - = DECL_FIELD_OFFSET (new_variant_part); - DECL_FIELD_BIT_OFFSET (union_field_list) - = DECL_FIELD_BIT_OFFSET (new_variant_part); - SET_DECL_OFFSET_ALIGN (union_field_list, - DECL_OFFSET_ALIGN (new_variant_part)); - new_variant_part = union_field_list; - } - - return new_variant_part; -} - -/* Copy the size (and alignment and alias set) from OLD_TYPE to NEW_TYPE, - which are both RECORD_TYPE, after applying the substitutions described - in SUBST_LIST. */ - -static void -copy_and_substitute_in_size (tree new_type, tree old_type, - vec<subst_pair> subst_list) -{ - unsigned int i; - subst_pair *s; - - TYPE_SIZE (new_type) = TYPE_SIZE (old_type); - TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (old_type); - SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (old_type)); - TYPE_ALIGN (new_type) = TYPE_ALIGN (old_type); - relate_alias_sets (new_type, old_type, ALIAS_SET_COPY); - - if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (new_type))) - FOR_EACH_VEC_ELT (subst_list, i, s) - TYPE_SIZE (new_type) - = SUBSTITUTE_IN_EXPR (TYPE_SIZE (new_type), - s->discriminant, s->replacement); - - if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (new_type))) - FOR_EACH_VEC_ELT (subst_list, i, s) - TYPE_SIZE_UNIT (new_type) - = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (new_type), - s->discriminant, s->replacement); - - if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (new_type))) - FOR_EACH_VEC_ELT (subst_list, i, s) - SET_TYPE_ADA_SIZE - (new_type, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (new_type), - s->discriminant, s->replacement)); - - /* Finalize the size. */ - TYPE_SIZE (new_type) = variable_size (TYPE_SIZE (new_type)); - TYPE_SIZE_UNIT (new_type) = variable_size (TYPE_SIZE_UNIT (new_type)); -} - -/* Given a type T, a FIELD_DECL F, and a replacement value R, return a - type with all size expressions that contain F in a PLACEHOLDER_EXPR - updated by replacing F with R. - - The function doesn't update the layout of the type, i.e. it assumes - that the substitution is purely formal. That's why the replacement - value R must itself contain a PLACEHOLDER_EXPR. */ - -tree -substitute_in_type (tree t, tree f, tree r) -{ - tree nt; - - gcc_assert (CONTAINS_PLACEHOLDER_P (r)); - - switch (TREE_CODE (t)) - { - case INTEGER_TYPE: - case ENUMERAL_TYPE: - case BOOLEAN_TYPE: - case REAL_TYPE: - - /* First the domain types of arrays. */ - if (CONTAINS_PLACEHOLDER_P (TYPE_GCC_MIN_VALUE (t)) - || CONTAINS_PLACEHOLDER_P (TYPE_GCC_MAX_VALUE (t))) - { - tree low = SUBSTITUTE_IN_EXPR (TYPE_GCC_MIN_VALUE (t), f, r); - tree high = SUBSTITUTE_IN_EXPR (TYPE_GCC_MAX_VALUE (t), f, r); - - if (low == TYPE_GCC_MIN_VALUE (t) && high == TYPE_GCC_MAX_VALUE (t)) - return t; - - nt = copy_type (t); - TYPE_GCC_MIN_VALUE (nt) = low; - TYPE_GCC_MAX_VALUE (nt) = high; - - if (TREE_CODE (t) == INTEGER_TYPE && TYPE_INDEX_TYPE (t)) - SET_TYPE_INDEX_TYPE - (nt, substitute_in_type (TYPE_INDEX_TYPE (t), f, r)); - - return nt; - } - - /* Then the subtypes. */ - if (CONTAINS_PLACEHOLDER_P (TYPE_RM_MIN_VALUE (t)) - || CONTAINS_PLACEHOLDER_P (TYPE_RM_MAX_VALUE (t))) - { - tree low = SUBSTITUTE_IN_EXPR (TYPE_RM_MIN_VALUE (t), f, r); - tree high = SUBSTITUTE_IN_EXPR (TYPE_RM_MAX_VALUE (t), f, r); - - if (low == TYPE_RM_MIN_VALUE (t) && high == TYPE_RM_MAX_VALUE (t)) - return t; - - nt = copy_type (t); - SET_TYPE_RM_MIN_VALUE (nt, low); - SET_TYPE_RM_MAX_VALUE (nt, high); - - return nt; - } - - return t; - - case COMPLEX_TYPE: - nt = substitute_in_type (TREE_TYPE (t), f, r); - if (nt == TREE_TYPE (t)) - return t; - - return build_complex_type (nt); - - case FUNCTION_TYPE: - /* These should never show up here. */ - gcc_unreachable (); - - case ARRAY_TYPE: - { - tree component = substitute_in_type (TREE_TYPE (t), f, r); - tree domain = substitute_in_type (TYPE_DOMAIN (t), f, r); - - if (component == TREE_TYPE (t) && domain == TYPE_DOMAIN (t)) - return t; - - nt = build_nonshared_array_type (component, domain); - TYPE_ALIGN (nt) = TYPE_ALIGN (t); - TYPE_USER_ALIGN (nt) = TYPE_USER_ALIGN (t); - SET_TYPE_MODE (nt, TYPE_MODE (t)); - TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r); - TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r); - TYPE_NONALIASED_COMPONENT (nt) = TYPE_NONALIASED_COMPONENT (t); - TYPE_MULTI_ARRAY_P (nt) = TYPE_MULTI_ARRAY_P (t); - TYPE_CONVENTION_FORTRAN_P (nt) = TYPE_CONVENTION_FORTRAN_P (t); - return nt; - } - - case RECORD_TYPE: - case UNION_TYPE: - case QUAL_UNION_TYPE: - { - bool changed_field = false; - tree field; - - /* Start out with no fields, make new fields, and chain them - in. If we haven't actually changed the type of any field, - discard everything we've done and return the old type. */ - nt = copy_type (t); - TYPE_FIELDS (nt) = NULL_TREE; - - for (field = TYPE_FIELDS (t); field; field = DECL_CHAIN (field)) - { - tree new_field = copy_node (field), new_n; - - new_n = substitute_in_type (TREE_TYPE (field), f, r); - if (new_n != TREE_TYPE (field)) - { - TREE_TYPE (new_field) = new_n; - changed_field = true; - } - - new_n = SUBSTITUTE_IN_EXPR (DECL_FIELD_OFFSET (field), f, r); - if (new_n != DECL_FIELD_OFFSET (field)) - { - DECL_FIELD_OFFSET (new_field) = new_n; - changed_field = true; - } - - /* Do the substitution inside the qualifier, if any. */ - if (TREE_CODE (t) == QUAL_UNION_TYPE) - { - new_n = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r); - if (new_n != DECL_QUALIFIER (field)) - { - DECL_QUALIFIER (new_field) = new_n; - changed_field = true; - } - } - - DECL_CONTEXT (new_field) = nt; - SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, field); - - DECL_CHAIN (new_field) = TYPE_FIELDS (nt); - TYPE_FIELDS (nt) = new_field; - } - - if (!changed_field) - return t; - - TYPE_FIELDS (nt) = nreverse (TYPE_FIELDS (nt)); - TYPE_SIZE (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE (t), f, r); - TYPE_SIZE_UNIT (nt) = SUBSTITUTE_IN_EXPR (TYPE_SIZE_UNIT (t), f, r); - SET_TYPE_ADA_SIZE (nt, SUBSTITUTE_IN_EXPR (TYPE_ADA_SIZE (t), f, r)); - return nt; - } - - default: - return t; - } -} - -/* Return the RM size of GNU_TYPE. This is the actual number of bits - needed to represent the object. */ - -tree -rm_size (tree gnu_type) -{ - /* For integral types, we store the RM size explicitly. */ - if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type)) - return TYPE_RM_SIZE (gnu_type); - - /* Return the RM size of the actual data plus the size of the template. */ - if (TREE_CODE (gnu_type) == RECORD_TYPE - && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) - return - size_binop (PLUS_EXPR, - rm_size (TREE_TYPE (DECL_CHAIN (TYPE_FIELDS (gnu_type)))), - DECL_SIZE (TYPE_FIELDS (gnu_type))); - - /* For record or union types, we store the size explicitly. */ - if (RECORD_OR_UNION_TYPE_P (gnu_type) - && !TYPE_FAT_POINTER_P (gnu_type) - && TYPE_ADA_SIZE (gnu_type)) - return TYPE_ADA_SIZE (gnu_type); - - /* For other types, this is just the size. */ - return TYPE_SIZE (gnu_type); -} - -/* Return the name to be used for GNAT_ENTITY. If a type, create a - fully-qualified name, possibly with type information encoding. - Otherwise, return the name. */ - -tree -get_entity_name (Entity_Id gnat_entity) -{ - Get_Encoded_Name (gnat_entity); - return get_identifier_with_length (Name_Buffer, Name_Len); -} - -/* Return an identifier representing the external name to be used for - GNAT_ENTITY. If SUFFIX is specified, the name is followed by "___" - and the specified suffix. */ - -tree -create_concat_name (Entity_Id gnat_entity, const char *suffix) -{ - Entity_Kind kind = Ekind (gnat_entity); - - if (suffix) - { - String_Template temp = {1, (int) strlen (suffix)}; - Fat_Pointer fp = {suffix, &temp}; - Get_External_Name_With_Suffix (gnat_entity, fp); - } - else - Get_External_Name (gnat_entity, 0); - - /* A variable using the Stdcall convention lives in a DLL. We adjust - its name to use the jump table, the _imp__NAME contains the address - for the NAME variable. */ - if ((kind == E_Variable || kind == E_Constant) - && Has_Stdcall_Convention (gnat_entity)) - { - const int len = 6 + Name_Len; - char *new_name = (char *) alloca (len + 1); - strcpy (new_name, "_imp__"); - strcat (new_name, Name_Buffer); - return get_identifier_with_length (new_name, len); - } - - return get_identifier_with_length (Name_Buffer, Name_Len); -} - -/* Given GNU_NAME, an IDENTIFIER_NODE containing a name and SUFFIX, a - string, return a new IDENTIFIER_NODE that is the concatenation of - the name followed by "___" and the specified suffix. */ - -tree -concat_name (tree gnu_name, const char *suffix) -{ - const int len = IDENTIFIER_LENGTH (gnu_name) + 3 + strlen (suffix); - char *new_name = (char *) alloca (len + 1); - strcpy (new_name, IDENTIFIER_POINTER (gnu_name)); - strcat (new_name, "___"); - strcat (new_name, suffix); - return get_identifier_with_length (new_name, len); -} - -#include "gt-ada-decl.h" |