diff options
Diffstat (limited to 'gcc-4.4.0/gcc/ada/gcc-interface/decl.c')
| -rw-r--r-- | gcc-4.4.0/gcc/ada/gcc-interface/decl.c | 7842 |
1 files changed, 0 insertions, 7842 deletions
diff --git a/gcc-4.4.0/gcc/ada/gcc-interface/decl.c b/gcc-4.4.0/gcc/ada/gcc-interface/decl.c deleted file mode 100644 index 5e44c3cef..000000000 --- a/gcc-4.4.0/gcc/ada/gcc-interface/decl.c +++ /dev/null @@ -1,7842 +0,0 @@ -/**************************************************************************** - * * - * GNAT COMPILER COMPONENTS * - * * - * D E C L * - * * - * C Implementation File * - * * - * Copyright (C) 1992-2009, 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 "convert.h" -#include "ggc.h" -#include "obstack.h" -#include "target.h" -#include "expr.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 "hashtab.h" -#include "ada-tree.h" -#include "gigi.h" - -#ifndef MAX_FIXED_MODE_SIZE -#define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (DImode) -#endif - -/* Convention_Stdcall should be processed in a specific way on Windows targets - only. The macro below is a helper to avoid having to check for a Windows - specific attribute throughout this unit. */ - -#if TARGET_DLLIMPORT_DECL_ATTRIBUTES -#define Has_Stdcall_Convention(E) (Convention (E) == Convention_Stdcall) -#else -#define Has_Stdcall_Convention(E) (0) -#endif - -/* Stack realignment for functions with foreign conventions is provided on a - per back-end basis now, as it is handled by the prologue expanders and not - as part of the function's body any more. It might be requested by way of a - dedicated function type attribute on the targets that support it. - - We need a way to avoid setting the attribute on the targets that don't - support it and use FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN for this purpose. - - It is defined on targets where the circuitry is available, and indicates - whether the realignment is needed for 'main'. We use this to decide for - foreign subprograms as well. - - It is not defined on targets where the circuitry is not implemented, and - we just never set the attribute in these cases. - - Whether it is defined on all targets that would need it in theory is - not entirely clear. We currently trust the base GCC settings for this - purpose. */ - -#ifndef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN -#define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN 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; - -/* These variables are used to defer finalizing types. The element of the - list is the TYPE_DECL associated with the type. */ -static int defer_finalize_level = 0; -static VEC (tree,heap) *defer_finalize_list; - -/* 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; - -enum alias_set_op -{ - ALIAS_SET_COPY, - ALIAS_SET_SUBSET, - ALIAS_SET_SUPERSET -}; - -static void relate_alias_sets (tree, tree, enum alias_set_op); - -static tree substitution_list (Entity_Id, Entity_Id, tree, bool); -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 is_variable_size (tree); -static tree elaborate_expression_1 (Node_Id, Entity_Id, tree, tree, - bool, bool); -static tree make_packable_type (tree, bool); -static tree gnat_to_gnu_field (Entity_Id, tree, int, bool); -static tree gnat_to_gnu_param (Entity_Id, Mechanism_Type, Entity_Id, bool, - bool *); -static bool same_discriminant_p (Entity_Id, Entity_Id); -static bool array_type_has_nonaliased_component (Entity_Id, tree); -static void components_to_record (tree, Node_Id, tree, int, bool, tree *, - bool, bool, bool, bool); -static Uint annotate_value (tree); -static void annotate_rep (Entity_Id, tree); -static tree compute_field_positions (tree, tree, tree, tree, unsigned int); -static tree validate_size (Uint, tree, Entity_Id, enum tree_code, bool, bool); -static void set_rm_size (Uint, tree, Entity_Id); -static tree make_type_from_size (tree, tree, bool); -static unsigned int validate_alignment (Uint, Entity_Id, unsigned int); -static unsigned int ceil_alignment (unsigned HOST_WIDE_INT); -static void check_ok_for_atomic (tree, Entity_Id, bool); -static int compatible_signatures_p (tree ftype1, tree ftype2); -static void rest_of_type_decl_compilation_no_defer (tree); - -/* Return true if GNAT_ADDRESS is a compile time known value. - In particular catch System'To_Address. */ - -static bool -compile_time_known_address_p (Node_Id gnat_address) -{ - return ((Nkind (gnat_address) == N_Unchecked_Type_Conversion - && Compile_Time_Known_Value (Expression (gnat_address))) - || Compile_Time_Known_Value (gnat_address)); -} - -/* Given GNAT_ENTITY, an entity in the incoming GNAT tree, return a - GCC type corresponding to that entity. GNAT_ENTITY is assumed to - refer to an Ada type. */ - -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; - - /* Convert the ada entity type into a GCC TYPE_DECL 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); -} - -/* Given GNAT_ENTITY, a GNAT defining identifier node, which denotes some Ada - entity, this routine returns the equivalent GCC tree for that entity - (an ..._DECL node) and associates 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 variables. - For renamed entities, 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 necessary to know whether an - external declaration or a definition should 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) -{ - Entity_Id gnat_equiv_type = Gigi_Equivalent_Type (gnat_entity); - tree gnu_entity_id; - tree gnu_type = NULL_TREE; - /* Contains the gnu XXXX_DECL tree node which is equivalent to the input - GNAT tree. This node will be associated with the GNAT node by calling - the save_gnu_tree routine at the end of the `switch' statement. */ - tree gnu_decl = NULL_TREE; - /* true if we have already saved gnu_decl as a gnat association. */ - bool saved = false; - /* Nonzero if we incremented defer_incomplete_level. */ - bool this_deferred = false; - /* Nonzero if we incremented force_global. */ - bool this_global = false; - /* Nonzero if we should check to see if elaborated during processing. */ - bool maybe_present = false; - /* Nonzero if we made GNU_DECL and its type here. */ - bool this_made_decl = false; - struct attrib *attr_list = NULL; - bool debug_info_p = (Needs_Debug_Info (gnat_entity) - || debug_info_level == DINFO_LEVEL_VERBOSE); - Entity_Kind kind = Ekind (gnat_entity); - Entity_Id gnat_temp; - unsigned int esize - = ((Known_Esize (gnat_entity) - && UI_Is_In_Int_Range (Esize (gnat_entity))) - ? MIN (UI_To_Int (Esize (gnat_entity)), - IN (kind, Float_Kind) - ? fp_prec_to_size (LONG_DOUBLE_TYPE_SIZE) - : IN (kind, Access_Kind) ? POINTER_SIZE * 2 - : LONG_LONG_TYPE_SIZE) - : LONG_LONG_TYPE_SIZE); - tree gnu_size = 0; - bool imported_p - = (Is_Imported (gnat_entity) && No (Address_Clause (gnat_entity))); - unsigned int align = 0; - - /* 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_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 that 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 entity "gnat_entity" has an incorrect scope, - i.e. that its scope does not correspond to the subprogram in which - it is declared */ - gcc_unreachable (); - } - - /* If this is entity 0, something went badly wrong. */ - gcc_assert (Present (gnat_entity)); - - /* 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 (present_gnu_tree (gnat_entity) - && (!definition || (Is_Type (gnat_entity) && imported_p))) - { - 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))); - - /* Likewise, 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)); - - /* 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_id = get_entity_name (gnat_entity); - Sloc_to_locus (Sloc (gnat_entity), &input_location); - - /* If we get here, it means we have not yet done anything with this - entity. If we are not defining it here, it must be external, - otherwise we should have defined it already. */ - gcc_assert (definition || Is_Public (gnat_entity) || type_annotate_only - || kind == E_Discriminant || kind == E_Component - || kind == E_Label - || (kind == E_Constant && Present (Full_View (gnat_entity))) - || IN (kind, Type_Kind)); - - /* 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. But do this for Imported functions or procedures in - all cases. */ - if ((!definition && Is_Public (gnat_entity) - && !Is_Statically_Allocated (gnat_entity) - && kind != E_Discriminant && kind != E_Component) - || (Is_Imported (gnat_entity) - && (kind == E_Function || kind == E_Procedure))) - 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); - - /* 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 (Is_Type (gnat_entity) && 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); - - 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 that - expression away later if it is not a constant. Do not retrieve the - expression if it is an aggregate or allocator, because in complex - instantiation contexts it may not be expanded */ - if (!definition - && Present (Expression (Declaration_Node (gnat_entity))) - && !No_Initialization (Declaration_Node (gnat_entity)) - && (Nkind (Expression (Declaration_Node (gnat_entity))) - != N_Aggregate) - && (Nkind (Expression (Declaration_Node (gnat_entity))) - != N_Allocator)) - gnu_expr = gnat_to_gnu (Expression (Declaration_Node (gnat_entity))); - - /* 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 - runtime 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 used_by_ref = false; - 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)))); - bool inner_const_flag = const_flag; - bool static_p = Is_Statically_Allocated (gnat_entity); - bool mutable_p = 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)); - - /* For a debug renaming declaration, build a pure debug entity. */ - if (Present (Debug_Renaming_Link (gnat_entity))) - { - rtx addr; - gnu_decl = build_decl (VAR_DECL, gnu_entity_id, gnu_type); - /* The (MEM (CONST (0))) pattern is prescribed by STABS. */ - if (global_bindings_p ()) - addr = gen_rtx_CONST (VOIDmode, const0_rtx); - else - addr = stack_pointer_rtx; - SET_DECL_RTL (gnu_decl, gen_rtx_MEM (Pmode, addr)); - 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 types are unconstrained arrays or - any object whose type is a dummy type or VOID_TYPE. */ - - 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 alignments. 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)); - gnu_type = maybe_pad_type (gnu_type, NULL_TREE, align, gnat_entity, - "PAD", false, definition, true); - } - - /* If we are defining the object, see if it has a Size value 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 value. 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 - && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))) - == RECORD_TYPE - && 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 the size is zero bytes, make it one byte since some linkers have - trouble 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))) - && !Present (Renamed_Object (gnat_entity)) - && !Present (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)) - && !imported_p - && No (Renamed_Object (gnat_entity)) - && No (Address_Clause (gnat_entity)))) - && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST) - { - /* 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. */ - unsigned int align_cap = Is_Atomic (gnat_entity) - ? BIGGEST_ALIGNMENT - : get_mode_alignment (ptr_mode); - - if (!host_integerp (TYPE_SIZE (gnu_type), 1) - || compare_tree_int (TYPE_SIZE (gnu_type), align_cap) >= 0) - align = align_cap; - else - align = ceil_alignment (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_fat - = TREE_TYPE (gnat_to_gnu_type (Base_Type (Etype (gnat_entity)))); - - gnu_type - = build_unc_object_type_from_ptr (gnu_fat, gnu_type, - concat_id_with_name (gnu_entity_id, - "UNC")); - } - -#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) - gnu_type = maybe_pad_type (gnu_type, gnu_size, align, gnat_entity, - "PAD", false, definition, - gnu_size ? true : false); - - /* 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 - && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))) - == RECORD_TYPE - && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))) - /* Strip useless conversions around the object. */ - || (TREE_CODE (gnu_expr) == NOP_EXPR - && gnat_types_compatible_p - (TREE_TYPE (gnu_expr), - TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))) - { - gnu_expr = TREE_OPERAND (gnu_expr, 0); - 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 SAVE_EXPRs evaluation - immediately and this requires a function context. */ - if (!Materialize_Entity (gnat_entity) - && (!global_bindings_p () - || (staticp (gnu_expr) - && !TREE_SIDE_EFFECTS (gnu_expr)))) - { - maybe_stable_expr - = maybe_stabilize_reference (gnu_expr, true, &stable); - - if (stable) - { - gnu_decl = maybe_stable_expr; - /* ??? No DECL_EXPR is created so we need to mark - the expression manually lest it is shared. */ - if (global_bindings_p ()) - mark_visited (&gnu_decl); - save_gnu_tree (gnat_entity, gnu_decl, true); - saved = true; - 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_Elementary_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 - { - 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 - = maybe_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 an object covered by it. */ - if ((Treat_As_Volatile (gnat_entity) - || (Is_Exported (gnat_entity) - /* Exclude exported constants created by the compiler, - which should boil down to static dispatch tables and - make it possible to put them in read-only memory. */ - && (Comes_From_Source (gnat_entity) || !const_flag)) - || Is_Imported (gnat_entity) - || 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 - via maybe_pad_type above. */ - || (TYPE_IS_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_IS_PADDING_P (gnu_type) - ? TYPE_FIELDS (TREE_TYPE (TYPE_FIELDS (gnu_type))) - : TYPE_FIELDS (gnu_type); - - gnu_expr - = gnat_build_constructor - (gnu_type, - tree_cons - (template_field, - build_template (TREE_TYPE (template_field), - TREE_TYPE (TREE_CHAIN (template_field)), - NULL_TREE), - NULL_TREE)); - } - - /* 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. */ - if (gnu_expr - && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE - && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) - && !(TREE_CODE (gnu_type) == RECORD_TYPE - && TYPE_IS_PADDING_P (gnu_type) - && (CONTAINS_PLACEHOLDER_P - (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type))))))) - gnu_expr = convert (gnu_type, gnu_expr); - - /* If this is a pointer and it does not have an initializing - expression, initialize it to NULL, unless the object is - imported. */ - if (definition - && (POINTER_TYPE_P (gnu_type) || TYPE_FAT_POINTER_P (gnu_type)) - && !Is_Imported (gnat_entity) && !gnu_expr) - 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))) - { - tree 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); - - /* 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 (Expression (Address_Clause - (gnat_entity))); - - /* 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 (gnu_size, - global_bindings_p () || !definition - || static_p))) - { - gnu_type = build_reference_type (gnu_type); - gnu_size = NULL_TREE; - used_by_ref = true; - const_flag = 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) - { - 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 (TREE_CHAIN (TYPE_FIELDS (gnu_alloc_type))); - - if (TREE_CODE (gnu_expr) == CONSTRUCTOR - && 1 == VEC_length (constructor_elt, - CONSTRUCTOR_ELTS (gnu_expr))) - gnu_expr = 0; - else - gnu_expr - = build_component_ref - (gnu_expr, NULL_TREE, - TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (gnu_expr))), - false); - } - - if (TREE_CODE (TYPE_SIZE_UNIT (gnu_alloc_type)) == INTEGER_CST - && TREE_OVERFLOW (TYPE_SIZE_UNIT (gnu_alloc_type)) - && !Is_Imported (gnat_entity)) - post_error ("?Storage_Error will be raised at run-time!", - gnat_entity); - - gnu_expr = build_allocator (gnu_alloc_type, gnu_expr, gnu_type, - 0, 0, gnat_entity, mutable_p); - } - 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 (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. */ - if (gnu_expr - && TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE - && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) - && !(TREE_CODE (gnu_type) == RECORD_TYPE - && TYPE_IS_PADDING_P (gnu_type) - && (CONTAINS_PLACEHOLDER_P - (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS (gnu_type))))))) - 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, 0); - - /* If this is constant initialized to a static constant and the - object has an aggregate type, force it to be statically - allocated. This will avoid 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) - && !(TREE_CODE (gnu_type) == RECORD_TYPE - && TYPE_IS_PADDING_P (gnu_type) - && !host_integerp (TYPE_SIZE_UNIT - (TREE_TYPE (TYPE_FIELDS (gnu_type))), 1))) - static_p = true; - - gnu_decl = create_var_decl (gnu_entity_id, 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; - if (TREE_CODE (gnu_decl) == VAR_DECL && renamed_obj) - { - SET_DECL_RENAMED_OBJECT (gnu_decl, renamed_obj); - if (global_bindings_p ()) - { - DECL_RENAMING_GLOBAL_P (gnu_decl) = 1; - record_global_renaming_pointer (gnu_decl); - } - } - - if (definition && DECL_SIZE_UNIT (gnu_decl) - && get_block_jmpbuf_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_1_expr - (update_setjmp_buf_decl, - build_unary_op (ADDR_EXPR, NULL_TREE, - get_block_jmpbuf_decl ())), - gnat_entity); - - /* If we are defining an Out parameter and we're not optimizing, - 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 still live on the stack so it can be - accessed from within the debugger through the PARM_DECL. */ - if (kind == E_Out_Parameter && definition && !optimize) - { - tree param = create_param_decl (gnu_entity_id, gnu_type, false); - gnat_pushdecl (param, gnat_entity); - SET_DECL_VALUE_EXPR (param, gnu_decl); - DECL_HAS_VALUE_EXPR_P (param) = 1; - if (debug_info_p) - debug_info_p = false; - else - DECL_IGNORED_P (param) = 1; - TREE_ADDRESSABLE (gnu_decl) = 1; - } - - /* If this is a public constant or we're not optimizing and we're not - making a VAR_DECL for it, make one just for export or debugger use. - Likewise if the address is taken or if either the object or type is - aliased. Make an external declaration for a reference, unless this - is a Standard entity since there no real symbol at the object level - for these. */ - if (TREE_CODE (gnu_decl) == CONST_DECL - && (definition || Sloc (gnat_entity) > Standard_Location) - && ((Is_Public (gnat_entity) - && !Present (Address_Clause (gnat_entity))) - || !optimize - || Address_Taken (gnat_entity) - || Is_Aliased (gnat_entity) - || Is_Aliased (Etype (gnat_entity)))) - { - tree gnu_corr_var - = create_true_var_decl (gnu_entity_id, gnu_ext_name, gnu_type, - gnu_expr, true, Is_Public (gnat_entity), - !definition, static_p, NULL, - gnat_entity); - - SET_DECL_CONST_CORRESPONDING_VAR (gnu_decl, gnu_corr_var); - - /* As debugging information will be generated for the variable, - do not generate information for the constant. */ - DECL_IGNORED_P (gnu_decl) = 1; - } - - /* If this is declared in a block that contains a block with an - exception handler, we must force this variable in memory to - suppress an invalid optimization. */ - if (Has_Nested_Block_With_Handler (Scope (gnat_entity)) - && Exception_Mechanism != Back_End_Exceptions) - TREE_ADDRESSABLE (gnu_decl) = 1; - - gnu_type = TREE_TYPE (gnu_decl); - - /* Back-annotate Alignment and Esize of the object if not already - known, except for when the object is actually a pointer to the - real object, since alignment and size of a pointer don't have - anything to do with those of the designated object. 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 confirming representation clauses in all cases. */ - - if (!used_by_ref && Unknown_Alignment (gnat_entity)) - Set_Alignment (gnat_entity, - UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT)); - - if (!used_by_ref && Unknown_Esize (gnat_entity)) - { - if (TREE_CODE (gnu_type) == RECORD_TYPE - && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) - gnu_object_size - = TYPE_SIZE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))); - - Set_Esize (gnat_entity, annotate_value (gnu_object_size)); - } - } - break; - - case E_Void: - /* Return a TYPE_DECL for "void" that we previously made. */ - gnu_decl = void_type_decl_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_id; - - /* Set TYPE_STRING_FLAG for Ada 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; - } - - /* Normal case of non-character type, or non-Standard character type */ - { - /* Here we have a list of enumeral constants in First_Literal. - We make a CONST_DECL for each and build into GNU_LITERAL_LIST - the list to be places into TYPE_FIELDS. Each node in the list - is a TREE_LIST node whose TREE_VALUE is the literal name - and whose TREE_PURPOSE is the value of the literal. - - Esize contains the number of bits needed to represent the enumeral - type, Type_Low_Bound also points to the first literal and - Type_High_Bound points to the last literal. */ - - Entity_Id gnat_literal; - tree gnu_literal_list = NULL_TREE; - - if (Is_Unsigned_Type (gnat_entity)) - gnu_type = make_unsigned_type (esize); - else - gnu_type = make_signed_type (esize); - - TREE_SET_CODE (gnu_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); - - save_gnu_tree (gnat_literal, gnu_literal, false); - gnu_literal_list = tree_cons (DECL_NAME (gnu_literal), - gnu_value, gnu_literal_list); - } - - TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list); - - /* Note that the bounds are updated at the end of this function - because to avoid an infinite recursion when we get the bounds of - this type, since those bounds are objects of this type. */ - } - break; - - 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); - break; - - 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. */ - { - enum machine_mode mode; - tree gnu_modulus; - tree gnu_high = 0; - - if (Is_Packed_Array_Type (gnat_entity)) - esize = UI_To_Int (RM_Size (gnat_entity)); - - /* Find the smallest mode at least ESIZE bits wide and make a class - using that mode. */ - - for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); - GET_MODE_BITSIZE (mode) < esize; - mode = GET_MODE_WIDER_MODE (mode)) - ; - - gnu_type = make_unsigned_type (GET_MODE_BITSIZE (mode)); - TYPE_PACKED_ARRAY_TYPE_P (gnu_type) - = (Is_Packed_Array_Type (gnat_entity) - && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))); - - /* 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 we have to set TYPE_PRECISION different from its natural value, - make a subtype to do do. Likewise if there is a modulus and - it is not one greater than TYPE_MAX_VALUE. */ - if (TYPE_PRECISION (gnu_type) != esize - || (TYPE_MODULAR_P (gnu_type) - && !tree_int_cst_equal (TYPE_MAX_VALUE (gnu_type), gnu_high))) - { - tree gnu_subtype = make_node (INTEGER_TYPE); - - TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "UMT"); - TREE_TYPE (gnu_subtype) = gnu_type; - TYPE_MIN_VALUE (gnu_subtype) = TYPE_MIN_VALUE (gnu_type); - TYPE_MAX_VALUE (gnu_subtype) - = TYPE_MODULAR_P (gnu_type) - ? gnu_high : TYPE_MAX_VALUE (gnu_type); - TYPE_PRECISION (gnu_subtype) = esize; - TYPE_UNSIGNED (gnu_subtype) = 1; - TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; - TYPE_PACKED_ARRAY_TYPE_P (gnu_subtype) - = (Is_Packed_Array_Type (gnat_entity) - && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))); - layout_type (gnu_subtype); - - gnu_type = gnu_subtype; - } - } - break; - - 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 build_range_type since we would - like each subtype node to be distinct. This will be important - when memory aliasing is implemented. - - The TREE_TYPE field of the INTEGER_TYPE we make points to the - parent 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 always 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); - - gnu_type = make_node (INTEGER_TYPE); - TREE_TYPE (gnu_type) = get_unpadded_type (Etype (gnat_entity)); - - /* Set the precision to the Esize except for bit-packed arrays and - subtypes of Standard.Boolean. */ - if (Is_Packed_Array_Type (gnat_entity) - && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) - { - esize = UI_To_Int (RM_Size (gnat_entity)); - TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1; - } - else if (TREE_CODE (TREE_TYPE (gnu_type)) == BOOLEAN_TYPE) - esize = 1; - - TYPE_PRECISION (gnu_type) = esize; - - TYPE_MIN_VALUE (gnu_type) - = convert (TREE_TYPE (gnu_type), - elaborate_expression (Type_Low_Bound (gnat_entity), - gnat_entity, - get_identifier ("L"), definition, 1, - Needs_Debug_Info (gnat_entity))); - - TYPE_MAX_VALUE (gnu_type) - = convert (TREE_TYPE (gnu_type), - elaborate_expression (Type_High_Bound (gnat_entity), - gnat_entity, - get_identifier ("U"), definition, 1, - 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); - - /* This should be an unsigned type if the lower bound is constant - and non-negative or if the base type is unsigned; a signed type - otherwise. */ - TYPE_UNSIGNED (gnu_type) - = (TYPE_UNSIGNED (TREE_TYPE (gnu_type)) - || (TREE_CODE (TYPE_MIN_VALUE (gnu_type)) == INTEGER_CST - && TREE_INT_CST_HIGH (TYPE_MIN_VALUE (gnu_type)) >= 0) - || TYPE_BIASED_REPRESENTATION_P (gnu_type) - || Is_Unsigned_Type (gnat_entity)); - - layout_type (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); - - /* If the type we are dealing with is to represent a 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 the - modular value in an enclosing struct. */ - if (Is_Packed_Array_Type (gnat_entity) - && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))) - { - tree gnu_field_type = gnu_type; - tree gnu_field; - - TYPE_RM_SIZE_NUM (gnu_field_type) - = UI_To_gnu (RM_Size (gnat_entity), bitsizetype); - gnu_type = make_node (RECORD_TYPE); - TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM"); - - /* Propagate the alignment of the modular type to the record. - This means that bitpacked arrays have "ceil" alignment for - their size, which may seem counter-intuitive but makes it - possible to easily overlay them on modular types. */ - TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type); - TYPE_PACKED (gnu_type) = 1; - - /* Create a stripped-down declaration of the original type, mainly - for debugging. */ - create_type_decl (get_entity_name (gnat_entity), gnu_field_type, - NULL, true, debug_info_p, gnat_entity); - - /* Don't notify the field as "addressable", since we won't be taking - it's address and it would prevent create_field_decl from making a - bitfield. */ - gnu_field = create_field_decl (get_identifier ("OBJECT"), - gnu_field_type, gnu_type, 1, 0, 0, 0); - - finish_record_type (gnu_type, gnu_field, 0, false); - TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1; - SET_TYPE_ADA_SIZE (gnu_type, bitsize_int (esize)); - - relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY); - } - - /* 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 under-align - the latter. We reuse the padding machinery for this purpose. */ - else if (Known_Alignment (gnat_entity) - && UI_Is_In_Int_Range (Alignment (gnat_entity)) - && (align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT) - && align < TYPE_ALIGN (gnu_type)) - { - tree gnu_field_type = gnu_type; - tree gnu_field; - - gnu_type = make_node (RECORD_TYPE); - TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD"); - - TYPE_ALIGN (gnu_type) = align; - TYPE_PACKED (gnu_type) = 1; - - /* Create a stripped-down declaration of the original type, mainly - for debugging. */ - create_type_decl (get_entity_name (gnat_entity), gnu_field_type, - NULL, true, debug_info_p, gnat_entity); - - /* Don't notify the field as "addressable", since we won't be taking - it's address and it would prevent create_field_decl from making a - bitfield. */ - gnu_field = create_field_decl (get_identifier ("OBJECT"), - gnu_field_type, gnu_type, 1, 0, 0, 0); - - finish_record_type (gnu_type, gnu_field, 0, false); - TYPE_IS_PADDING_P (gnu_type) = 1; - SET_TYPE_ADA_SIZE (gnu_type, bitsize_int (esize)); - - relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY); - } - - /* Otherwise reset the alignment lest we computed it above. */ - else - align = 0; - - 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_MIN_VALUE (gnu_type) - = convert (TREE_TYPE (gnu_type), - elaborate_expression (Type_Low_Bound (gnat_entity), - gnat_entity, get_identifier ("L"), - definition, 1, - Needs_Debug_Info (gnat_entity))); - - TYPE_MAX_VALUE (gnu_type) - = convert (TREE_TYPE (gnu_type), - elaborate_expression (Type_High_Bound (gnat_entity), - gnat_entity, get_identifier ("U"), - definition, 1, - 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; - } - - layout_type (gnu_type); - - /* 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: - { - tree gnu_template_fields = NULL_TREE; - tree gnu_template_type = make_node (RECORD_TYPE); - tree gnu_ptr_template = build_pointer_type (gnu_template_type); - tree gnu_fat_type = make_node (RECORD_TYPE); - int ndim = Number_Dimensions (gnat_entity); - int firstdim - = (Convention (gnat_entity) == Convention_Fortran) ? ndim - 1 : 0; - int nextdim - = (Convention (gnat_entity) == Convention_Fortran) ? - 1 : 1; - int index; - tree *gnu_index_types = (tree *) alloca (ndim * sizeof (tree *)); - tree *gnu_temp_fields = (tree *) alloca (ndim * sizeof (tree *)); - tree gnu_comp_size = 0; - tree gnu_max_size = size_one_node; - tree gnu_max_size_unit; - Entity_Id gnat_ind_subtype; - Entity_Id gnat_ind_base_subtype; - tree gnu_template_reference; - tree tem; - - TYPE_NAME (gnu_template_type) - = create_concat_name (gnat_entity, "XUB"); - - /* 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 = chainon (chainon (NULL_TREE, - create_field_decl (get_identifier ("P_ARRAY"), - ptr_void_type_node, - gnu_fat_type, 0, 0, 0, 0)), - create_field_decl (get_identifier ("P_BOUNDS"), - gnu_ptr_template, - gnu_fat_type, 0, 0, 0, 0)); - - /* Make sure we can put this into a register. */ - TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE); - - /* Do not finalize this record type since the types of its fields - are still incomplete at this point. */ - finish_record_type (gnu_fat_type, tem, 0, true); - TYPE_IS_FAT_POINTER_P (gnu_fat_type) = 1; - - /* 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), - TREE_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; - - /* Now create the GCC type for each index and add the fields for - that index to the template. */ - for (index = firstdim, gnat_ind_subtype = First_Index (gnat_entity), - gnat_ind_base_subtype - = First_Index (Implementation_Base_Type (gnat_entity)); - index < ndim && index >= 0; - index += nextdim, - gnat_ind_subtype = Next_Index (gnat_ind_subtype), - gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype)) - { - char field_name[10]; - tree gnu_ind_subtype - = get_unpadded_type (Base_Type (Etype (gnat_ind_subtype))); - tree gnu_base_subtype - = get_unpadded_type (Etype (gnat_ind_base_subtype)); - tree gnu_base_min - = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype)); - tree gnu_base_max - = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype)); - tree gnu_min_field, gnu_max_field, gnu_min, gnu_max; - - /* Make the FIELD_DECLs for the minimum and maximum of this - type and then make extractions of that field from the - template. */ - sprintf (field_name, "LB%d", index); - gnu_min_field = create_field_decl (get_identifier (field_name), - gnu_ind_subtype, - gnu_template_type, 0, 0, 0, 0); - field_name[0] = 'U'; - gnu_max_field = create_field_decl (get_identifier (field_name), - gnu_ind_subtype, - gnu_template_type, 0, 0, 0, 0); - - Sloc_to_locus (Sloc (gnat_entity), - &DECL_SOURCE_LOCATION (gnu_min_field)); - Sloc_to_locus (Sloc (gnat_entity), - &DECL_SOURCE_LOCATION (gnu_max_field)); - gnu_temp_fields[index] = chainon (gnu_min_field, gnu_max_field); - - /* We can't use build_component_ref here since the template - type isn't complete yet. */ - gnu_min = build3 (COMPONENT_REF, gnu_ind_subtype, - gnu_template_reference, gnu_min_field, - NULL_TREE); - gnu_max = build3 (COMPONENT_REF, gnu_ind_subtype, - gnu_template_reference, gnu_max_field, - NULL_TREE); - TREE_READONLY (gnu_min) = TREE_READONLY (gnu_max) = 1; - - /* Make a range type with the new ranges, but using - the Ada subtype. Then we convert to sizetype. */ - gnu_index_types[index] - = create_index_type (convert (sizetype, gnu_min), - convert (sizetype, gnu_max), - build_range_type (gnu_ind_subtype, - gnu_min, gnu_max), - gnat_entity); - /* Update the maximum size of the array, in elements. */ - gnu_max_size - = size_binop (MULT_EXPR, gnu_max_size, - size_binop (PLUS_EXPR, size_one_node, - size_binop (MINUS_EXPR, gnu_base_max, - gnu_base_min))); - - TYPE_NAME (gnu_index_types[index]) - = create_concat_name (gnat_entity, field_name); - } - - for (index = 0; index < ndim; index++) - gnu_template_fields - = chainon (gnu_template_fields, gnu_temp_fields[index]); - - /* Install all the fields into the template. */ - finish_record_type (gnu_template_type, gnu_template_fields, 0, false); - TYPE_READONLY (gnu_template_type) = 1; - - /* Now make the array of arrays and update the pointer to the array - in the fat pointer. Note that it is the first field. */ - tem = gnat_to_gnu_type (Component_Type (gnat_entity)); - - /* Try to get a smaller form of the component if needed. */ - if ((Is_Packed (gnat_entity) - || Has_Component_Size_Clause (gnat_entity)) - && !Is_Bit_Packed_Array (gnat_entity) - && !Has_Aliased_Components (gnat_entity) - && !Strict_Alignment (Component_Type (gnat_entity)) - && TREE_CODE (tem) == RECORD_TYPE - && !TYPE_IS_FAT_POINTER_P (tem) - && host_integerp (TYPE_SIZE (tem), 1)) - tem = make_packable_type (tem, false); - - if (Has_Atomic_Components (gnat_entity)) - check_ok_for_atomic (tem, gnat_entity, true); - - /* Get and validate any specified Component_Size, but if Packed, - ignore it since the front end will have taken care of it. */ - gnu_comp_size - = validate_size (Component_Size (gnat_entity), tem, - gnat_entity, - (Is_Bit_Packed_Array (gnat_entity) - ? TYPE_DECL : VAR_DECL), - true, Has_Component_Size_Clause (gnat_entity)); - - /* If the component type is a RECORD_TYPE that has a self-referential - size, use the maximum size. */ - if (!gnu_comp_size && TREE_CODE (tem) == RECORD_TYPE - && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (tem))) - gnu_comp_size = max_size (TYPE_SIZE (tem), true); - - if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity)) - { - tree orig_tem; - tem = make_type_from_size (tem, gnu_comp_size, false); - orig_tem = tem; - tem = maybe_pad_type (tem, gnu_comp_size, 0, gnat_entity, - "C_PAD", 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 (tem != orig_tem) - create_type_decl (TYPE_NAME (tem), tem, NULL, true, - debug_info_p, gnat_entity); - } - - if (Has_Volatile_Components (gnat_entity)) - tem = build_qualified_type (tem, - TYPE_QUALS (tem) | TYPE_QUAL_VOLATILE); - - /* 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 (tem))); - - gnu_max_size_unit = size_binop (MAX_EXPR, size_zero_node, - size_binop (MULT_EXPR, gnu_max_size, - TYPE_SIZE_UNIT (tem))); - gnu_max_size = size_binop (MAX_EXPR, bitsize_zero_node, - size_binop (MULT_EXPR, - convert (bitsizetype, - gnu_max_size), - TYPE_SIZE (tem))); - - for (index = ndim - 1; index >= 0; index--) - { - tem = build_array_type (tem, gnu_index_types[index]); - TYPE_MULTI_ARRAY_P (tem) = (index > 0); - if (array_type_has_nonaliased_component (gnat_entity, tem)) - TYPE_NONALIASED_COMPONENT (tem) = 1; - } - - /* If an alignment is specified, use it if valid. But ignore it for - types that represent the unpacked base type for packed arrays. If - the alignment was requested with an explicit user alignment clause, - state so. */ - if (No (Packed_Array_Type (gnat_entity)) - && Known_Alignment (gnat_entity)) - { - gcc_assert (Present (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 (gnat_entity) == Convention_Fortran); - TREE_TYPE (TYPE_FIELDS (gnu_fat_type)) = build_pointer_type (tem); - - /* The result type is an UNCONSTRAINED_ARRAY_TYPE that indicates the - corresponding fat pointer. */ - TREE_TYPE (gnu_type) = TYPE_POINTER_TO (gnu_type) - = TYPE_REFERENCE_TO (gnu_type) = gnu_fat_type; - SET_TYPE_MODE (gnu_type, BLKmode); - TYPE_ALIGN (gnu_type) = TYPE_ALIGN (tem); - SET_TYPE_UNCONSTRAINED_ARRAY (gnu_fat_type, gnu_type); - - /* If the maximum size doesn't overflow, use it. */ - if (TREE_CODE (gnu_max_size) == INTEGER_CST - && !TREE_OVERFLOW (gnu_max_size)) - TYPE_SIZE (tem) - = size_binop (MIN_EXPR, gnu_max_size, TYPE_SIZE (tem)); - if (TREE_CODE (gnu_max_size_unit) == INTEGER_CST - && !TREE_OVERFLOW (gnu_max_size_unit)) - 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. */ - create_type_decl (create_concat_name (gnat_entity, "XUP"), - gnu_fat_type, NULL, !Comes_From_Source (gnat_entity), - debug_info_p, gnat_entity); - - /* Create the type to be used as what a thin pointer designates: an - record type for the object and its template with the field offsets - shifted to have the template at a negative offset. */ - tem = build_unc_object_type (gnu_template_type, tem, - create_concat_name (gnat_entity, "XUT")); - shift_unc_components_for_thin_pointers (tem); - - SET_TYPE_UNCONSTRAINED_ARRAY (tem, gnu_type); - TYPE_OBJECT_RECORD_TYPE (gnu_type) = tem; - - /* Give the thin pointer type a name. */ - create_type_decl (create_concat_name (gnat_entity, "XUX"), - build_pointer_type (tem), NULL, - !Comes_From_Source (gnat_entity), debug_info_p, - gnat_entity); - } - break; - - case E_String_Subtype: - case E_Array_Subtype: - - /* This is the actual data type for array variables. Multidimensional - arrays are implemented in the gnu tree as arrays of arrays. Note - that for the moment 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)) - break; - else - { - int index; - int array_dim = Number_Dimensions (gnat_entity); - int first_dim - = ((Convention (gnat_entity) == Convention_Fortran) - ? array_dim - 1 : 0); - int next_dim - = (Convention (gnat_entity) == Convention_Fortran) ? -1 : 1; - Entity_Id gnat_ind_subtype; - Entity_Id gnat_ind_base_subtype; - tree gnu_base_type = gnu_type; - tree *gnu_index_type = (tree *) alloca (array_dim * sizeof (tree *)); - tree gnu_comp_size = NULL_TREE; - tree gnu_max_size = size_one_node; - tree gnu_max_size_unit; - bool need_index_type_struct = false; - bool max_overflow = false; - - /* First create the gnu types for each index. Create types for - debugging information to point to the index types if the - are not integer types, have variable bounds, or are - wider than sizetype. */ - - for (index = first_dim, gnat_ind_subtype = First_Index (gnat_entity), - gnat_ind_base_subtype - = First_Index (Implementation_Base_Type (gnat_entity)); - index < array_dim && index >= 0; - index += next_dim, - gnat_ind_subtype = Next_Index (gnat_ind_subtype), - gnat_ind_base_subtype = Next_Index (gnat_ind_base_subtype)) - { - tree gnu_index_subtype - = get_unpadded_type (Etype (gnat_ind_subtype)); - tree gnu_min - = convert (sizetype, TYPE_MIN_VALUE (gnu_index_subtype)); - tree gnu_max - = convert (sizetype, TYPE_MAX_VALUE (gnu_index_subtype)); - tree gnu_base_subtype - = get_unpadded_type (Etype (gnat_ind_base_subtype)); - tree gnu_base_min - = convert (sizetype, TYPE_MIN_VALUE (gnu_base_subtype)); - tree gnu_base_max - = convert (sizetype, TYPE_MAX_VALUE (gnu_base_subtype)); - tree gnu_base_type = get_base_type (gnu_base_subtype); - tree gnu_base_base_min - = convert (sizetype, TYPE_MIN_VALUE (gnu_base_type)); - tree gnu_base_base_max - = convert (sizetype, TYPE_MAX_VALUE (gnu_base_type)); - tree gnu_high; - tree gnu_this_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 - indications. */ - if ((TYPE_PRECISION (gnu_index_subtype) - > TYPE_PRECISION (sizetype) - || TYPE_UNSIGNED (gnu_index_subtype) - != TYPE_UNSIGNED (sizetype)) - && TREE_CODE (gnu_min) == INTEGER_CST - && TREE_CODE (gnu_max) == INTEGER_CST - && TREE_OVERFLOW (gnu_min) && TREE_OVERFLOW (gnu_max) - && (!TREE_OVERFLOW - (fold_build2 (MINUS_EXPR, gnu_index_subtype, - TYPE_MAX_VALUE (gnu_index_subtype), - TYPE_MIN_VALUE (gnu_index_subtype))))) - { - TREE_OVERFLOW (gnu_min) = 0; - TREE_OVERFLOW (gnu_max) = 0; - } - - /* Similarly, if the range is null, use bounds of 1..0 for - the sizetype bounds. */ - else if ((TYPE_PRECISION (gnu_index_subtype) - > TYPE_PRECISION (sizetype) - || TYPE_UNSIGNED (gnu_index_subtype) - != TYPE_UNSIGNED (sizetype)) - && TREE_CODE (gnu_min) == INTEGER_CST - && TREE_CODE (gnu_max) == INTEGER_CST - && (TREE_OVERFLOW (gnu_min) || TREE_OVERFLOW (gnu_max)) - && tree_int_cst_lt (TYPE_MAX_VALUE (gnu_index_subtype), - TYPE_MIN_VALUE (gnu_index_subtype))) - gnu_min = size_one_node, gnu_max = size_zero_node; - - /* Now compute the size of this bound. 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 subtype. If we can - prove that the low bound minus one can't overflow, we - can do this as MAX (hb, lb - 1). Otherwise, we have to use - the expression hb >= lb ? hb : lb - 1. */ - gnu_high = size_binop (MINUS_EXPR, gnu_min, size_one_node); - - /* See if the base array type is already flat. If it is, we - are probably compiling an ACVC test, but it will cause the - code below to malfunction if we don't handle it specially. */ - if (TREE_CODE (gnu_base_min) == INTEGER_CST - && TREE_CODE (gnu_base_max) == INTEGER_CST - && !TREE_OVERFLOW (gnu_base_min) - && !TREE_OVERFLOW (gnu_base_max) - && tree_int_cst_lt (gnu_base_max, gnu_base_min)) - gnu_high = size_zero_node, gnu_min = size_one_node; - - /* If gnu_high is now an integer which overflowed, the array - cannot be superflat. */ - else if (TREE_CODE (gnu_high) == INTEGER_CST - && TREE_OVERFLOW (gnu_high)) - gnu_high = gnu_max; - else if (TYPE_UNSIGNED (gnu_base_subtype) - || TREE_CODE (gnu_high) == INTEGER_CST) - gnu_high = size_binop (MAX_EXPR, gnu_max, gnu_high); - else - gnu_high - = build_cond_expr - (sizetype, build_binary_op (GE_EXPR, integer_type_node, - gnu_max, gnu_min), - gnu_max, gnu_high); - - gnu_index_type[index] - = create_index_type (gnu_min, gnu_high, gnu_index_subtype, - gnat_entity); - - /* Also compute the maximum size of the array. 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 ((TREE_CODE (gnu_min) == INTEGER_CST - && !TREE_OVERFLOW (gnu_min) - && !operand_equal_p (gnu_min, gnu_base_base_min, 0)) - || !CONTAINS_PLACEHOLDER_P (gnu_min) - || !(TREE_CODE (gnu_base_min) == INTEGER_CST - && !TREE_OVERFLOW (gnu_base_min))) - gnu_base_min = gnu_min; - - if ((TREE_CODE (gnu_max) == INTEGER_CST - && !TREE_OVERFLOW (gnu_max) - && !operand_equal_p (gnu_max, gnu_base_base_max, 0)) - || !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)) - max_overflow = true; - - gnu_base_min = size_binop (MAX_EXPR, gnu_base_min, gnu_min); - gnu_base_max = size_binop (MIN_EXPR, gnu_base_max, gnu_max); - - 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)) - max_overflow = true; - - gnu_max_size - = size_binop (MULT_EXPR, gnu_max_size, gnu_this_max); - - if (!integer_onep (TYPE_MIN_VALUE (gnu_index_subtype)) - || (TREE_CODE (TYPE_MAX_VALUE (gnu_index_subtype)) - != INTEGER_CST) - || TREE_CODE (gnu_index_subtype) != INTEGER_TYPE - || (TREE_TYPE (gnu_index_subtype) - && (TREE_CODE (TREE_TYPE (gnu_index_subtype)) - != INTEGER_TYPE)) - || TYPE_BIASED_REPRESENTATION_P (gnu_index_subtype) - || (TYPE_PRECISION (gnu_index_subtype) - > TYPE_PRECISION (sizetype))) - 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 = array_dim - 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_type (Component_Type (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; - } - - /* Try to get a smaller form of the component if needed. */ - if ((Is_Packed (gnat_entity) - || Has_Component_Size_Clause (gnat_entity)) - && !Is_Bit_Packed_Array (gnat_entity) - && !Has_Aliased_Components (gnat_entity) - && !Strict_Alignment (Component_Type (gnat_entity)) - && TREE_CODE (gnu_type) == RECORD_TYPE - && !TYPE_IS_FAT_POINTER_P (gnu_type) - && host_integerp (TYPE_SIZE (gnu_type), 1)) - gnu_type = make_packable_type (gnu_type, false); - - /* Get and validate any specified Component_Size, but if Packed, - ignore it since the front end will have taken care of it. */ - gnu_comp_size - = validate_size (Component_Size (gnat_entity), gnu_type, - gnat_entity, - (Is_Bit_Packed_Array (gnat_entity) - ? TYPE_DECL : VAR_DECL), true, - Has_Component_Size_Clause (gnat_entity)); - - /* If the component type is a RECORD_TYPE that has a - self-referential size, use the maximum 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); - - if (gnu_comp_size && !Is_Bit_Packed_Array (gnat_entity)) - { - tree orig_gnu_type; - gnu_type - = make_type_from_size (gnu_type, gnu_comp_size, false); - orig_gnu_type = gnu_type; - gnu_type = maybe_pad_type (gnu_type, gnu_comp_size, 0, - gnat_entity, "C_PAD", 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_gnu_type) - create_type_decl (TYPE_NAME (gnu_type), gnu_type, NULL, - true, debug_info_p, gnat_entity); - } - - if (Has_Volatile_Components (Base_Type (gnat_entity))) - gnu_type = build_qualified_type (gnu_type, - (TYPE_QUALS (gnu_type) - | TYPE_QUAL_VOLATILE)); - } - - 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)); - - for (index = array_dim - 1; index >= 0; index --) - { - gnu_type = build_array_type (gnu_type, gnu_index_type[index]); - TYPE_MULTI_ARRAY_P (gnu_type) = (index > 0); - if (array_type_has_nonaliased_component (gnat_entity, gnu_type)) - TYPE_NONALIASED_COMPONENT (gnu_type) = 1; - } - - /* 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 () && array_dim > 1) - { - tree gnu_str_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_str_name = concat_id_with_name (gnu_str_name, "ST")) - { - tree eltype = TREE_TYPE (gnu_arr_type); - - TYPE_SIZE (gnu_arr_type) - = elaborate_expression_1 (gnat_entity, gnat_entity, - TYPE_SIZE (gnu_arr_type), - gnu_str_name, definition, 0); - - /* ??? 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) - = build_binary_op - (MULT_EXPR, sizetype, - elaborate_expression_1 - (gnat_entity, gnat_entity, - build_binary_op (EXACT_DIV_EXPR, sizetype, - TYPE_SIZE_UNIT (gnu_arr_type), - size_int (TYPE_ALIGN (eltype) - / BITS_PER_UNIT)), - concat_id_with_name (gnu_str_name, "A_U"), - definition, 0), - size_int (TYPE_ALIGN (eltype) / BITS_PER_UNIT)); - - /* ??? 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, do it now. */ - if (need_index_type_struct && debug_info_p) - { - tree gnu_bound_rec_type = make_node (RECORD_TYPE); - tree gnu_field_list = NULL_TREE; - tree gnu_field; - - TYPE_NAME (gnu_bound_rec_type) - = create_concat_name (gnat_entity, "XA"); - - for (index = array_dim - 1; index >= 0; index--) - { - tree gnu_type_name - = TYPE_NAME (TYPE_INDEX_TYPE (gnu_index_type[index])); - - if (TREE_CODE (gnu_type_name) == TYPE_DECL) - gnu_type_name = DECL_NAME (gnu_type_name); - - gnu_field = create_field_decl (gnu_type_name, - integer_type_node, - gnu_bound_rec_type, - 0, NULL_TREE, NULL_TREE, 0); - TREE_CHAIN (gnu_field) = gnu_field_list; - gnu_field_list = gnu_field; - } - - finish_record_type (gnu_bound_rec_type, gnu_field_list, - 0, false); - - TYPE_STUB_DECL (gnu_type) - = build_decl (TYPE_DECL, NULL_TREE, gnu_type); - - add_parallel_type - (TYPE_STUB_DECL (gnu_type), gnu_bound_rec_type); - } - - TYPE_CONVENTION_FORTRAN_P (gnu_type) - = (Convention (gnat_entity) == Convention_Fortran); - TYPE_PACKED_ARRAY_TYPE_P (gnu_type) - = (Is_Packed_Array_Type (gnat_entity) - && Is_Bit_Packed_Array (Original_Array_Type (gnat_entity))); - - /* If our size depends on a placeholder and the maximum size doesn't - overflow, use it. */ - if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type)) - && !(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)) - && !max_overflow) - { - 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_type; - - /* First finish the type we had been making so that we output - debugging information for it */ - gnu_type - = build_qualified_type (gnu_type, - (TYPE_QUALS (gnu_type) - | (TYPE_QUAL_VOLATILE - * Treat_As_Volatile (gnat_entity)))); - gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list, - !Comes_From_Source (gnat_entity), - debug_info_p, gnat_entity); - if (!Comes_From_Source (gnat_entity)) - DECL_ARTIFICIAL (gnu_decl) = 1; - - /* 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_type = gnu_type; - while (TREE_CODE (gnu_inner_type) == RECORD_TYPE - && (TYPE_JUSTIFIED_MODULAR_P (gnu_inner_type) - || TYPE_IS_PADDING_P (gnu_inner_type))) - gnu_inner_type = TREE_TYPE (TYPE_FIELDS (gnu_inner_type)); - - /* We need to point the type we just made to our index type so - the actual bounds can be put into a template. */ - - if ((TREE_CODE (gnu_inner_type) == ARRAY_TYPE - && !TYPE_ACTUAL_BOUNDS (gnu_inner_type)) - || (TREE_CODE (gnu_inner_type) == INTEGER_TYPE - && !TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type))) - { - if (TREE_CODE (gnu_inner_type) == INTEGER_TYPE) - { - /* The TYPE_ACTUAL_BOUNDS field is also used for the modulus. - If it is, we need to make another type. */ - if (TYPE_MODULAR_P (gnu_inner_type)) - { - tree gnu_subtype; - - gnu_subtype = make_node (INTEGER_TYPE); - - TREE_TYPE (gnu_subtype) = gnu_inner_type; - TYPE_MIN_VALUE (gnu_subtype) - = TYPE_MIN_VALUE (gnu_inner_type); - TYPE_MAX_VALUE (gnu_subtype) - = TYPE_MAX_VALUE (gnu_inner_type); - TYPE_PRECISION (gnu_subtype) - = TYPE_PRECISION (gnu_inner_type); - TYPE_UNSIGNED (gnu_subtype) - = TYPE_UNSIGNED (gnu_inner_type); - TYPE_EXTRA_SUBTYPE_P (gnu_subtype) = 1; - layout_type (gnu_subtype); - - gnu_inner_type = gnu_subtype; - } - - TYPE_HAS_ACTUAL_BOUNDS_P (gnu_inner_type) = 1; - } - - SET_TYPE_ACTUAL_BOUNDS (gnu_inner_type, NULL_TREE); - - for (gnat_index = First_Index (gnat_entity); - Present (gnat_index); gnat_index = Next_Index (gnat_index)) - SET_TYPE_ACTUAL_BOUNDS - (gnu_inner_type, - tree_cons (NULL_TREE, - get_unpadded_type (Etype (gnat_index)), - TYPE_ACTUAL_BOUNDS (gnu_inner_type))); - - if (Convention (gnat_entity) != Convention_Fortran) - SET_TYPE_ACTUAL_BOUNDS - (gnu_inner_type, - nreverse (TYPE_ACTUAL_BOUNDS (gnu_inner_type))); - - if (TREE_CODE (gnu_type) == RECORD_TYPE - && TYPE_JUSTIFIED_MODULAR_P (gnu_type)) - TREE_TYPE (TYPE_FIELDS (gnu_type)) = gnu_inner_type; - } - } - - /* Abort if packed array with no packed array type field set. */ - else - 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))); - int length = UI_To_Int (String_Literal_Length (gnat_entity)); - tree gnu_length = ssize_int (length - 1); - tree gnu_upper_bound - = build_binary_op (PLUS_EXPR, gnu_string_index_type, - gnu_lower_bound, - convert (gnu_string_index_type, gnu_length)); - tree gnu_range_type - = build_range_type (gnu_string_index_type, - gnu_lower_bound, gnu_upper_bound); - tree gnu_index_type - = create_index_type (convert (sizetype, - TYPE_MIN_VALUE (gnu_range_type)), - convert (sizetype, - TYPE_MAX_VALUE (gnu_range_type)), - gnu_range_type, gnat_entity); - - gnu_type - = build_array_type (gnat_to_gnu_type (Component_Type (gnat_entity)), - gnu_index_type); - if (array_type_has_nonaliased_component (gnat_entity, gnu_type)) - 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; - tree gnu_field_list = NULL_TREE; - 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_Static_Esize (gnat_entity))) - ? -2 - : 0; - 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); - - /* See if all fields have a rep clause. Stop when we find one - that doesn't. */ - for (gnat_field = First_Entity (gnat_entity); - Present (gnat_field) && all_rep; - 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; - - /* 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_id; - TYPE_PACKED (gnu_type) = (packed != 0) || has_rep; - - 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_Esize (gnat_entity)) - TYPE_SIZE (gnu_type) = UI_To_gnu (Esize (gnat_entity), sizetype); - - /* 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)) - TYPE_ALIGN (gnu_type) - = esize >= BITS_PER_WORD ? BITS_PER_WORD : ceil_alignment (esize); - /* 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_Static_Esize (gnat_entity)) - { - unsigned int raw_size = UI_To_Int (Esize (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_parent; - - /* A major complexity here is that the parent subtype will - reference our discriminants in its Discriminant_Constraint - list. But those must reference the parent component of this - record which is 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, void_type_node, - build0 (PLACEHOLDER_EXPR, gnu_type), - build_decl (FIELD_DECL, NULL_TREE, - void_type_node), - NULL_TREE); - - if (Has_Discriminants (gnat_entity)) - for (gnat_field = First_Stored_Discriminant (gnat_entity); - Present (gnat_field); - gnat_field = Next_Stored_Discriminant (gnat_field)) - if (Present (Corresponding_Discriminant (gnat_field))) - save_gnu_tree - (gnat_field, - build3 (COMPONENT_REF, - get_unpadded_type (Etype (gnat_field)), - gnu_get_parent, - gnat_to_gnu_field_decl (Corresponding_Discriminant - (gnat_field)), - NULL_TREE), - true); - - /* Then we build the parent subtype. */ - 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_Discriminants (gnat_entity)) - 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_list - = create_field_decl (get_identifier - (Get_Name_String (Name_uParent)), - gnu_parent, gnu_type, 0, - has_rep ? TYPE_SIZE (gnu_parent) : 0, - has_rep ? bitsize_zero_node : 0, 1); - DECL_INTERNAL_P (gnu_field_list) = 1; - TREE_OPERAND (gnu_get_parent, 1) = gnu_field_list; - } - - /* Make the fields for the discriminants and put them into the record - unless it's an Unchecked_Union. */ - if (Has_Discriminants (gnat_entity)) - 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 already - handled the discriminant 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); - - /* Make an expression using a PLACEHOLDER_EXPR from the - FIELD_DECL node just created and link that with the - corresponding GNAT defining identifier. Then add to the - list of fields. */ - save_gnu_tree (gnat_field, - build3 (COMPONENT_REF, TREE_TYPE (gnu_field), - build0 (PLACEHOLDER_EXPR, - DECL_CONTEXT (gnu_field)), - gnu_field, NULL_TREE), - true); - - if (!Is_Unchecked_Union (gnat_entity)) - { - TREE_CHAIN (gnu_field) = gnu_field_list; - gnu_field_list = gnu_field; - } - } - - /* Put the discriminants into the record (backwards), so we can - know the appropriate discriminant to use for the names of the - variants. */ - TYPE_FIELDS (gnu_type) = gnu_field_list; - - /* Add the listed fields into the record and finish it up. */ - components_to_record (gnu_type, Component_List (record_definition), - gnu_field_list, packed, definition, NULL, - false, all_rep, false, - Is_Unchecked_Union (gnat_entity)); - - /* We used to remove the associations of the discriminants and - _Parent for validity checking, but we may need them if there's - Freeze_Node for a subtype used in this record. */ - TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity); - TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_entity); - - /* If it is a tagged record force the type to BLKmode to insure - that these objects will always be placed in memory. Do the - same thing for limited record types. */ - if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity)) - SET_TYPE_MODE (gnu_type, BLKmode); - - /* 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); - } - 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; - } - - /* 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 having the position - computed by transforming every discriminant reference according - to the constraints. We don't see any difference between - private and nonprivate 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; - tree gnu_orig_type; - - if (!definition) - defer_incomplete_level++, this_deferred = true; - - /* Get the base type initially for its alignment and sizes. But - if it is a padded type, we do all the other work with the - unpadded type. */ - gnu_base_type = gnat_to_gnu_type (gnat_base_type); - - if (TREE_CODE (gnu_base_type) == RECORD_TYPE - && TYPE_IS_PADDING_P (gnu_base_type)) - gnu_type = gnu_orig_type = TREE_TYPE (TYPE_FIELDS (gnu_base_type)); - else - gnu_type = gnu_orig_type = gnu_base_type; - - if (present_gnu_tree (gnat_entity)) - { - maybe_present = true; - break; - } - - /* When the type has discriminants, and these discriminants - affect the shape of what it built, factor them in. - - If we are making a subtype of an Unchecked_Union (must be an - Itype), just return the type. - - We can't just use Is_Constrained because private subtypes without - discriminants of full types with discriminants with default - expressions are Is_Constrained but aren't constrained! */ - - if (IN (Ekind (gnat_base_type), Record_Kind) - && !Is_For_Access_Subtype (gnat_entity) - && !Is_Unchecked_Union (gnat_base_type) - && Is_Constrained (gnat_entity) - && Stored_Constraint (gnat_entity) != No_Elist - && Present (Discriminant_Constraint (gnat_entity))) - { - Entity_Id gnat_field; - tree gnu_field_list = 0; - tree gnu_pos_list - = compute_field_positions (gnu_orig_type, NULL_TREE, - size_zero_node, bitsize_zero_node, - BIGGEST_ALIGNMENT); - tree gnu_subst_list - = substitution_list (gnat_entity, gnat_base_type, NULL_TREE, - definition); - tree gnu_temp; - - gnu_type = make_node (RECORD_TYPE); - TYPE_NAME (gnu_type) = gnu_entity_id; - TYPE_VOLATILE (gnu_type) = Treat_As_Volatile (gnat_entity); - - /* Set the size, alignment and alias set of the new type to - match that of the old one, doing required substitutions. - We do it this early because we need the size of the new - type below to discard old fields if necessary. */ - TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_base_type); - TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_base_type); - SET_TYPE_ADA_SIZE (gnu_type, TYPE_ADA_SIZE (gnu_base_type)); - TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_base_type); - relate_alias_sets (gnu_type, gnu_base_type, ALIAS_SET_COPY); - - if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_type))) - for (gnu_temp = gnu_subst_list; - gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp)) - TYPE_SIZE (gnu_type) - = substitute_in_expr (TYPE_SIZE (gnu_type), - TREE_PURPOSE (gnu_temp), - TREE_VALUE (gnu_temp)); - - if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (gnu_type))) - for (gnu_temp = gnu_subst_list; - gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp)) - TYPE_SIZE_UNIT (gnu_type) - = substitute_in_expr (TYPE_SIZE_UNIT (gnu_type), - TREE_PURPOSE (gnu_temp), - TREE_VALUE (gnu_temp)); - - if (CONTAINS_PLACEHOLDER_P (TYPE_ADA_SIZE (gnu_type))) - for (gnu_temp = gnu_subst_list; - gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp)) - SET_TYPE_ADA_SIZE - (gnu_type, substitute_in_expr (TYPE_ADA_SIZE (gnu_type), - TREE_PURPOSE (gnu_temp), - TREE_VALUE (gnu_temp))); - - 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) - && (Underlying_Type (Scope (Original_Record_Component - (gnat_field))) - == gnat_base_type) - && (No (Corresponding_Discriminant (gnat_field)) - || !Is_Tagged_Type (gnat_base_type))) - { - tree gnu_old_field - = gnat_to_gnu_field_decl (Original_Record_Component - (gnat_field)); - tree gnu_offset - = TREE_VALUE (purpose_member (gnu_old_field, - gnu_pos_list)); - tree gnu_pos = TREE_PURPOSE (gnu_offset); - tree gnu_bitpos = TREE_VALUE (TREE_VALUE (gnu_offset)); - tree gnu_field_type - = gnat_to_gnu_type (Etype (gnat_field)); - tree gnu_size = TYPE_SIZE (gnu_field_type); - tree gnu_new_pos = NULL_TREE; - unsigned int offset_align - = tree_low_cst (TREE_PURPOSE (TREE_VALUE (gnu_offset)), - 1); - tree gnu_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 - (Original_Record_Component (gnat_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 (TREE_CODE (gnu_field_type) == RECORD_TYPE - && !TYPE_IS_FAT_POINTER_P (gnu_field_type) - && host_integerp (TYPE_SIZE (gnu_field_type), 1)) - gnu_field_type - = make_packable_type (gnu_field_type, true); - } - - if (CONTAINS_PLACEHOLDER_P (gnu_pos)) - for (gnu_temp = gnu_subst_list; - gnu_temp; gnu_temp = TREE_CHAIN (gnu_temp)) - gnu_pos = substitute_in_expr (gnu_pos, - TREE_PURPOSE (gnu_temp), - TREE_VALUE (gnu_temp)); - - /* 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 below. */ - if (TREE_CONSTANT (gnu_pos)) - { - gnu_new_pos = bit_from_pos (gnu_pos, gnu_bitpos); - - /* Discard old fields that are outside the new type. - This avoids confusing code scanning it to decide - how to pass it to functions on some platforms. */ - if (TREE_CODE (gnu_new_pos) == INTEGER_CST - && TREE_CODE (TYPE_SIZE (gnu_type)) == INTEGER_CST - && !integer_zerop (gnu_size) - && !tree_int_cst_lt (gnu_new_pos, - TYPE_SIZE (gnu_type))) - continue; - } - - gnu_field - = create_field_decl - (DECL_NAME (gnu_old_field), gnu_field_type, gnu_type, - DECL_PACKED (gnu_old_field), gnu_size, gnu_new_pos, - !DECL_NONADDRESSABLE_P (gnu_old_field)); - - if (!TREE_CONSTANT (gnu_pos)) - { - normalize_offset (&gnu_pos, &gnu_bitpos, offset_align); - DECL_FIELD_OFFSET (gnu_field) = gnu_pos; - DECL_FIELD_BIT_OFFSET (gnu_field) = gnu_bitpos; - SET_DECL_OFFSET_ALIGN (gnu_field, offset_align); - DECL_SIZE (gnu_field) = gnu_size; - DECL_SIZE_UNIT (gnu_field) - = convert (sizetype, - size_binop (CEIL_DIV_EXPR, gnu_size, - bitsize_unit_node)); - layout_decl (gnu_field, DECL_OFFSET_ALIGN (gnu_field)); - } - - DECL_INTERNAL_P (gnu_field) - = DECL_INTERNAL_P (gnu_old_field); - SET_DECL_ORIGINAL_FIELD - (gnu_field, (DECL_ORIGINAL_FIELD (gnu_old_field) - ? DECL_ORIGINAL_FIELD (gnu_old_field) - : gnu_old_field)); - DECL_DISCRIMINANT_NUMBER (gnu_field) - = DECL_DISCRIMINANT_NUMBER (gnu_old_field); - TREE_THIS_VOLATILE (gnu_field) - = TREE_THIS_VOLATILE (gnu_old_field); - - /* To match the layout crafted in components_to_record, if - this is the _Tag field, put it before any discriminants - instead of after them as for all other fields. */ - if (Chars (gnat_field) == Name_uTag) - gnu_field_list = chainon (gnu_field_list, gnu_field); - else - { - TREE_CHAIN (gnu_field) = gnu_field_list; - gnu_field_list = gnu_field; - } - - save_gnu_tree (gnat_field, gnu_field, false); - } - - /* 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 finalize it since we're going to modify it below. */ - gnu_field_list = nreverse (gnu_field_list); - finish_record_type (gnu_type, gnu_field_list, 2, true); - - /* Finalize size and mode. */ - TYPE_SIZE (gnu_type) = variable_size (TYPE_SIZE (gnu_type)); - TYPE_SIZE_UNIT (gnu_type) - = variable_size (TYPE_SIZE_UNIT (gnu_type)); - - compute_record_mode (gnu_type); - - /* Fill in locations of fields. */ - annotate_rep (gnat_entity, gnu_type); - - /* We've built a new type, make an XVS type to show what this - is a subtype of. Some debuggers require the XVS type to be - output first, so do it in that order. */ - if (debug_info_p) - { - tree gnu_subtype_marker = make_node (RECORD_TYPE); - tree gnu_orig_name = TYPE_NAME (gnu_orig_type); - - if (TREE_CODE (gnu_orig_name) == TYPE_DECL) - gnu_orig_name = DECL_NAME (gnu_orig_name); - - TYPE_NAME (gnu_subtype_marker) - = create_concat_name (gnat_entity, "XVS"); - finish_record_type (gnu_subtype_marker, - create_field_decl (gnu_orig_name, - integer_type_node, - gnu_subtype_marker, - 0, NULL_TREE, - NULL_TREE, 0), - 0, false); - - add_parallel_type (TYPE_STUB_DECL (gnu_type), - gnu_subtype_marker); - } - - /* 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 - 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 - = (struct incomplete *) xmalloc (sizeof (struct incomplete)); - - gnu_type - = build_pointer_type - (make_dummy_type (Directly_Designated_Type (gnat_entity))); - gnu_decl = create_type_decl (gnu_entity_id, 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: - { - Entity_Id gnat_desig_type = Directly_Designated_Type (gnat_entity); - Entity_Id gnat_desig_equiv = Gigi_Equivalent_Type (gnat_desig_type); - bool is_from_limited_with - = (IN (Ekind (gnat_desig_equiv), Incomplete_Kind) - && From_With_Type (gnat_desig_equiv)); - - /* 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, 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); - - /* This the type actually used to represent the designated type, - either gnat_desig_full or gnat_desig_equiv. */ - Entity_Id gnat_desig_rep; - - /* Nonzero 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)); - - /* Nonzero if we make a dummy type here. */ - bool got_fat_p = false; - /* Nonzero if the dummy is a fat pointer. */ - bool made_dummy = false; - tree gnu_desig_type = NULL_TREE; - enum machine_mode p_mode = mode_for_size (esize, MODE_INT, 0); - - 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); - - /* Now set the type that actually marks the representation of - the designated type and also flag whether we have a unconstrained - array. */ - gnat_desig_rep = 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 a fat pointer type. The two types in our - fields will be pointers to dummy nodes and will be replaced in - update_pointer_to. Similarly, if the type itself is a dummy type or - an unconstrained array. Also make a dummy TYPE_OBJECT_RECORD_TYPE - in case we have any thin pointers to it. */ - 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)))) - || (No (gnat_desig_full) && ! 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_rep))))) - { - tree gnu_old - = (present_gnu_tree (gnat_desig_rep) - ? TREE_TYPE (get_gnu_tree (gnat_desig_rep)) - : make_dummy_type (gnat_desig_rep)); - tree fields; - - /* Show the dummy we get will be a fat pointer. */ - got_fat_p = made_dummy = true; - - /* If the call above got something that has a pointer, that - pointer is our type. This could have happened either - because the type was elaborated or because somebody - else executed the code below. */ - gnu_type = TYPE_POINTER_TO (gnu_old); - if (!gnu_type) - { - tree gnu_template_type = make_node (ENUMERAL_TYPE); - tree gnu_ptr_template = build_pointer_type (gnu_template_type); - tree gnu_array_type = make_node (ENUMERAL_TYPE); - tree gnu_ptr_array = build_pointer_type (gnu_array_type); - - TYPE_NAME (gnu_template_type) - = concat_id_with_name (get_entity_name (gnat_desig_equiv), - "XUB"); - TYPE_DUMMY_P (gnu_template_type) = 1; - - TYPE_NAME (gnu_array_type) - = concat_id_with_name (get_entity_name (gnat_desig_equiv), - "XUA"); - TYPE_DUMMY_P (gnu_array_type) = 1; - - gnu_type = make_node (RECORD_TYPE); - SET_TYPE_UNCONSTRAINED_ARRAY (gnu_type, gnu_old); - TYPE_POINTER_TO (gnu_old) = gnu_type; - - Sloc_to_locus (Sloc (gnat_entity), &input_location); - fields - = chainon (chainon (NULL_TREE, - create_field_decl - (get_identifier ("P_ARRAY"), - gnu_ptr_array, - gnu_type, 0, 0, 0, 0)), - create_field_decl (get_identifier ("P_BOUNDS"), - gnu_ptr_template, - gnu_type, 0, 0, 0, 0)); - - /* Make sure we can place this into a register. */ - TYPE_ALIGN (gnu_type) - = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE); - TYPE_IS_FAT_POINTER_P (gnu_type) = 1; - - /* Do not finalize this record type since the types of - its fields are incomplete. */ - finish_record_type (gnu_type, fields, 0, true); - - TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE); - TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old)) - = concat_id_with_name (get_entity_name (gnat_desig_equiv), - "XUT"); - TYPE_DUMMY_P (TYPE_OBJECT_RECORD_TYPE (gnu_old)) = 1; - } - } - - /* 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 - since this access type may be the full view of some - 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 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 straightforward case where we can just - elaborate our designated type and point to it. */ - 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 have a GCC type for the designated type, possibly modify it - if we are pointing only to constant objects and then make a pointer - to it. Don't do this for unconstrained arrays. */ - if (!gnu_type && gnu_desig_type) - { - 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 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 have to defer - to the end of the current spec in two cases: first if the - designated type is in the current unit and second if the access - type is. */ - if ((! in_main_unit || is_from_limited_with) && made_dummy) - { - tree gnu_old_type - = TYPE_FAT_POINTER_P (gnu_type) - ? TYPE_UNCONSTRAINED_ARRAY (gnu_type) : TREE_TYPE (gnu_type); - - if (esize == POINTER_SIZE - && (got_fat_p || TYPE_FAT_POINTER_P (gnu_type))) - gnu_type - = build_pointer_type - (TYPE_OBJECT_RECORD_TYPE - (TYPE_UNCONSTRAINED_ARRAY (gnu_type))); - - gnu_decl = create_type_decl (gnu_entity_id, 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; - - if (defer_incomplete_level == 0 - && ! (is_from_limited_with - && (in_main_unit - || In_Extended_Main_Code_Unit (gnat_entity)))) - update_pointer_to (TYPE_MAIN_VARIANT (gnu_old_type), - gnat_to_gnu_type (gnat_desig_equiv)); - - /* Note that the call to gnat_to_gnu_type here might have - updated gnu_old_type directly, in which case it is not a - dummy type any more when we get into update_pointer_to. - - This may happen for instance when the designated type is a - record type, because their elaboration starts with an - initial node from make_dummy_type, which may yield 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. */ - else - { - struct incomplete *p - = (struct incomplete *) xmalloc (sizeof - (struct incomplete)); - struct incomplete **head - = (is_from_limited_with - && (in_main_unit - || In_Extended_Main_Code_Unit (gnat_entity)) - ? &defer_limited_with : &defer_incomplete_list); - - p->old_type = gnu_old_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 runtime 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 - = (struct incomplete *) xmalloc (sizeof (struct incomplete)); - tree gnu_ptr_type - = build_pointer_type - (make_dummy_type (Directly_Designated_Type (gnat_entity))); - - p->old_type = TREE_TYPE (gnu_ptr_type); - 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 (functions - or procedures): - - 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. - - In addition for function subprograms we have: - - Etype Return type of the function. - - 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 first GCC parameter declaration (a PARM_DECL node). The - PARM_DECL nodes are chained through the TREE_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; - /* The type returned by a function. If the subprogram is a procedure - this type should be void_type_node. */ - tree gnu_return_type = void_type_node; - /* List of fields in return type of procedure with copy-in copy-out - parameters. */ - tree gnu_field_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_return_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; - - /* 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 returns_by_ref = false; - bool returns_unconstrained = false; - bool returns_by_target_ptr = false; - bool has_copy_in_out = false; - bool has_stub = false; - int parmnum; - - if (kind == E_Subprogram_Type && !definition) - /* A parameter may refer to this type, so defer completion - of any incomplete types. */ - 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. - - We still want the parameter associations to take place because the - proper generation of calls depends on it (a GNAT parameter without - a corresponding GCC tree has a very specific meaning), so we don't - just break here. */ - if (Convention (gnat_entity) == Convention_Intrinsic) - gnu_builtin_decl = builtin_decl_for (gnu_ext_name); - - /* ??? 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. */ - - if (kind == E_Function || kind == E_Subprogram_Type) - gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity)); - - /* If this function returns by reference, make the actual - return type of this function the pointer and mark the decl. */ - if (Returns_By_Ref (gnat_entity)) - { - returns_by_ref = true; - gnu_return_type = build_pointer_type (gnu_return_type); - } - - /* If the Mechanism is By_Reference, ensure the return type uses - the machine's by-reference mechanism, which may not the same - as above (e.g., it might be by passing a fake parameter). */ - else if (kind == E_Function - && Mechanism (gnat_entity) == By_Reference) - { - TREE_ADDRESSABLE (gnu_return_type) = 1; - - /* We expect this bit to be reset by gigi shortly, so can avoid a - type node copy here. This actually also prevents troubles with - the generation of debug information for the function, because - we might have issued such info for this type already, and would - be attaching a distinct type node to the function if we made a - copy here. */ - } - - /* If we are supposed to return an unconstrained array, - actually return a fat pointer and make a note of that. Return - a pointer to an unconstrained record of variable size. */ - else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE) - { - gnu_return_type = TREE_TYPE (gnu_return_type); - returns_unconstrained = true; - } - - /* If the type requires a transient scope, the result is allocated - on the secondary stack, so the result type of the function is - just a pointer. */ - else if (Requires_Transient_Scope (Etype (gnat_entity))) - { - gnu_return_type = build_pointer_type (gnu_return_type); - returns_unconstrained = true; - } - - /* If the type is a padded type and the underlying type would not - be passed by reference or this function has a foreign convention, - return the underlying type. */ - else if (TREE_CODE (gnu_return_type) == RECORD_TYPE - && 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 has a non-constant size, we convert the function - into a procedure and its caller will pass a pointer to an object as - the first parameter when we call the function. This can happen for - an unconstrained type with a maximum size or a constrained type with - a size not known at compile time. */ - if (TYPE_SIZE_UNIT (gnu_return_type) - && !TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type))) - { - returns_by_target_ptr = true; - gnu_param_list - = create_param_decl (get_identifier ("TARGET"), - build_reference_type (gnu_return_type), - true); - gnu_return_type = void_type_node; - } - - /* 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_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type)) - && TREE_OVERFLOW (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; - } - - /* Look at all our parameters and get the type of - each. While doing this, build a copy-out structure if - we need one. */ - - /* Loop over the parameters and get their associated GCC tree. - While doing this, build a 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++) - { - tree gnu_param_name = get_entity_name (gnat_param); - tree gnu_param_type = gnat_to_gnu_type (Etype (gnat_param)); - tree gnu_param, gnu_field; - bool copy_in_copy_out = false; - Mechanism_Type mech = Mechanism (gnat_param); - - /* 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; - } - - 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; - } - - 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_FAT_POINTER_P (gnu_param_type)) - const_flag = false; - } - - if (copy_in_copy_out) - { - if (!has_copy_in_out) - { - gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE); - gnu_return_type = make_node (RECORD_TYPE); - TYPE_NAME (gnu_return_type) = get_identifier ("RETURN"); - has_copy_in_out = true; - } - - gnu_field = create_field_decl (gnu_param_name, gnu_param_type, - gnu_return_type, 0, 0, 0, 0); - Sloc_to_locus (Sloc (gnat_param), - &DECL_SOURCE_LOCATION (gnu_field)); - TREE_CHAIN (gnu_field) = gnu_field_list; - gnu_field_list = gnu_field; - gnu_return_list = tree_cons (gnu_field, gnu_param, - gnu_return_list); - } - } - - /* Do not compute record for out parameters if subprogram is - stubbed since structures are incomplete for the back-end. */ - if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed) - finish_record_type (gnu_return_type, nreverse (gnu_field_list), - 0, false); - - /* If we have a CICO list but it has only one entry, we convert - this function into a function that simply returns that one - object. */ - if (list_length (gnu_return_list) == 1) - gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list)); - - if (Has_Stdcall_Convention (gnat_entity)) - prepend_one_attribute_to - (&attr_list, ATTR_MACHINE_ATTRIBUTE, - get_identifier ("stdcall"), NULL_TREE, - gnat_entity); - - /* If we are on a target where stack realignment is needed for 'main' - to honor GCC's implicit expectations (stack alignment greater than - what the base ABI guarantees), ensure we do the same for foreign - convention subprograms as they might be used as callbacks from code - breaking such expectations. Note that this applies to task entry - points in particular. */ - if (FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN - && 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_return_list = nreverse (gnu_return_list); - - if (Ekind (gnat_entity) == E_Function) - Set_Mechanism (gnat_entity, - (returns_by_ref || returns_unconstrained - ? By_Reference : By_Copy)); - gnu_type - = create_subprog_type (gnu_return_type, gnu_param_list, - gnu_return_list, returns_unconstrained, - returns_by_ref, returns_by_target_ptr); - - if (has_stub) - gnu_stub_type - = create_subprog_type (gnu_return_type, gnu_stub_param_list, - gnu_return_list, returns_unconstrained, - returns_by_ref, returns_by_target_ptr); - - /* 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)); - - Sloc_to_locus (Sloc (gnat_entity), &input_location); - - 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, check the signatures - compatibilities. If the signatures are compatible, use the builtin - decl. If they are not, we expect the checker predicate to have - posted the appropriate errors, and just continue with what we have - so far. */ - if (gnu_builtin_decl) - { - tree gnu_builtin_type = TREE_TYPE (gnu_builtin_decl); - - if (compatible_signatures_p (gnu_type, gnu_builtin_type)) - { - gnu_decl = gnu_builtin_decl; - gnu_type = gnu_builtin_type; - 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_id) - 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_id, 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_id, gnu_type, attr_list, - !Comes_From_Source (gnat_entity), - 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; - } - - gnu_decl = create_subprog_decl (gnu_entity_id, gnu_ext_name, - gnu_type, gnu_param_list, - inline_flag, public_flag, - extern_flag, attr_list, - gnat_entity); - if (has_stub) - { - tree gnu_stub_decl - = create_subprog_decl (gnu_entity_id, gnu_stub_name, - gnu_stub_type, gnu_stub_param_list, - inline_flag, true, - extern_flag, 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 (Ekind (gnat_entity), 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); - 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. */ - gnu_type = make_dummy_type (gnat_entity); - - /* Save this type as the full declaration's type so we can do any - needed updates when we see it. */ - gnu_decl = create_type_decl (gnu_entity_id, gnu_type, attr_list, - !Comes_From_Source (gnat_entity), - debug_info_p, gnat_entity); - save_gnu_tree (full_view, gnu_decl, 0); - break; - } - - /* Simple class_wide types are always viewed as their root_type - by Gigi unless an Equivalent_Type is specified. */ - case E_Class_Wide_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: - if (type_annotate_only && No (gnat_equiv_type)) - gnu_type = void_type_node; - else - gnu_type = gnat_to_gnu_type (gnat_equiv_type); - - maybe_present = true; - break; - - case E_Label: - gnu_decl = create_label_decl (gnu_entity_id); - 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 ((!gnu_decl || this_made_decl) && IN (kind, Type_Kind)) - { - if (Is_Tagged_Type (gnat_entity) - || Is_Class_Wide_Equivalent_Type (gnat_entity)) - TYPE_ALIGN_OK (gnu_type) = 1; - - if (AGGREGATE_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) - gnu_size = validate_size (Esize (gnat_entity), 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 = 0; - } - - /* 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 as the type size has already - been adjusted to the alignment. */ - if (gnu_size) - size = gnu_size; - else if ((TREE_CODE (gnu_type) == RECORD_TYPE - || TREE_CODE (gnu_type) == UNION_TYPE - || TREE_CODE (gnu_type) == QUAL_UNION_TYPE) - && !TYPE_IS_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, - "PAD", true, definition, false); - - if (TREE_CODE (gnu_type) == RECORD_TYPE - && TYPE_IS_PADDING_P (gnu_type)) - { - gnu_entity_id = TYPE_NAME (gnu_type); - if (TREE_CODE (gnu_entity_id) == TYPE_DECL) - gnu_entity_id = DECL_NAME (gnu_entity_id); - } - - 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))) - { - if (TREE_CODE (gnu_type) == RECORD_TYPE - && operand_equal_p (TYPE_ADA_SIZE (gnu_type), - TYPE_SIZE (gnu_type), 0)) - { - TYPE_SIZE (gnu_type) - = elaborate_expression_1 (gnat_entity, gnat_entity, - TYPE_SIZE (gnu_type), - get_identifier ("SIZE"), - definition, 0); - SET_TYPE_ADA_SIZE (gnu_type, TYPE_SIZE (gnu_type)); - } - else - { - TYPE_SIZE (gnu_type) - = elaborate_expression_1 (gnat_entity, gnat_entity, - TYPE_SIZE (gnu_type), - get_identifier ("SIZE"), - definition, 0); - - /* ??? 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) - = build_binary_op - (MULT_EXPR, sizetype, - elaborate_expression_1 - (gnat_entity, gnat_entity, - build_binary_op (EXACT_DIV_EXPR, sizetype, - TYPE_SIZE_UNIT (gnu_type), - size_int (TYPE_ALIGN (gnu_type) - / BITS_PER_UNIT)), - get_identifier ("SIZE_A_UNIT"), - definition, 0), - size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT)); - - if (TREE_CODE (gnu_type) == RECORD_TYPE) - SET_TYPE_ADA_SIZE - (gnu_type, - elaborate_expression_1 (gnat_entity, - gnat_entity, - TYPE_ADA_SIZE (gnu_type), - get_identifier ("RM_SIZE"), - definition, 0)); - } - } - - /* If this is a record type or subtype, call elaborate_expression_1 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); - - /* ??? Unfortunately, GCC needs to be able to prove the - alignment of this offset and if it's a variable, it can't. - In GCC 3.4, we'll use DECL_OFFSET_ALIGN in some way, but - right now, we have to put in an explicit multiply and - divide by that value. */ - if (!CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (gnu_field))) - { - DECL_FIELD_OFFSET (gnu_field) - = build_binary_op - (MULT_EXPR, sizetype, - elaborate_expression_1 - (gnat_temp, gnat_temp, - build_binary_op (EXACT_DIV_EXPR, sizetype, - DECL_FIELD_OFFSET (gnu_field), - size_int (DECL_OFFSET_ALIGN (gnu_field) - / BITS_PER_UNIT)), - get_identifier ("OFFSET"), - definition, 0), - size_int (DECL_OFFSET_ALIGN (gnu_field) / BITS_PER_UNIT)); - - /* ??? 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)); - } - } - - gnu_type = build_qualified_type (gnu_type, - (TYPE_QUALS (gnu_type) - | (TYPE_QUAL_VOLATILE - * Treat_As_Volatile (gnat_entity)))); - - 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_id, gnu_type, attr_list, - !Comes_From_Source (gnat_entity), - debug_info_p, gnat_entity); - else - TREE_TYPE (gnu_decl) = gnu_type; - } - - if (IN (kind, Type_Kind) && !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 - - 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, ALIAS_SET_SUPERSET); - } - - /* Back-annotate the Alignment of the type if not already in the - tree. Likewise for sizes. */ - if (Unknown_Alignment (gnat_entity)) - Set_Alignment (gnat_entity, - UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT)); - - if (Unknown_Esize (gnat_entity) && TYPE_SIZE (gnu_type)) - { - /* If the size is self-referential, we annotate the maximum - value of that size. */ - tree gnu_size = TYPE_SIZE (gnu_type); - - if (CONTAINS_PLACEHOLDER_P (gnu_size)) - gnu_size = max_size (gnu_size, true); - - Set_Esize (gnat_entity, annotate_value (gnu_size)); - - if (type_annotate_only && Is_Tagged_Type (gnat_entity)) - { - /* In this mode the tag and the parent components are not - generated by the front-end, so the sizes must be adjusted - explicitly now. */ - int size_offset, new_size; - - if (Is_Derived_Type (gnat_entity)) - { - size_offset - = UI_To_Int (Esize (Etype (Base_Type (gnat_entity)))); - Set_Alignment (gnat_entity, - Alignment (Etype (Base_Type (gnat_entity)))); - } - else - size_offset = POINTER_SIZE; - - new_size = UI_To_Int (Esize (gnat_entity)) + size_offset; - Set_Esize (gnat_entity, - UI_From_Int (((new_size + (POINTER_SIZE - 1)) - / POINTER_SIZE) * POINTER_SIZE)); - Set_RM_Size (gnat_entity, Esize (gnat_entity)); - } - } - - if (Unknown_RM_Size (gnat_entity) && rm_size (gnu_type)) - Set_RM_Size (gnat_entity, annotate_value (rm_size (gnu_type))); - } - - if (!Comes_From_Source (gnat_entity) && DECL_P (gnu_decl)) - DECL_ARTIFICIAL (gnu_decl) = 1; - - if (!debug_info_p && DECL_P (gnu_decl) - && TREE_CODE (gnu_decl) != FUNCTION_DECL - && No (Renamed_Object (gnat_entity))) - 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 enumeral or floating-point type, we were not able to set - the bounds since they refer to the type. These bounds are always static. - - For enumeration types, also write debugging information and declare the - enumeration literal table, if needed. */ - - 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; - - /* If this is a padded type, we need to use the underlying type. */ - if (TREE_CODE (gnu_scalar_type) == RECORD_TYPE - && 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_type; - - TYPE_MIN_VALUE (gnu_scalar_type) - = gnat_to_gnu (Type_Low_Bound (gnat_entity)); - TYPE_MAX_VALUE (gnu_scalar_type) - = gnat_to_gnu (Type_High_Bound (gnat_entity)); - - if (TREE_CODE (gnu_scalar_type) == ENUMERAL_TYPE) - { - /* Since this has both a typedef and a tag, avoid outputting - the name twice. */ - DECL_ARTIFICIAL (gnu_decl) = 1; - rest_of_type_decl_compilation (gnu_decl); - } - } - - /* If we deferred processing of incomplete types, re-enable it. If there - were no other disables and we have some to process, do so. */ - if (this_deferred && --defer_incomplete_level == 0) - { - if (defer_incomplete_list) - { - struct incomplete *incp, *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. */ - incp = defer_incomplete_list; - defer_incomplete_list = NULL; - - /* For finalization, however, all types must be complete so we - cannot do the same because deferred incomplete types may end up - referencing each other. Process them all recursively first. */ - defer_finalize_level++; - - for (; incp; incp = next) - { - next = incp->next; - - if (incp->old_type) - update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type), - gnat_to_gnu_type (incp->full_type)); - free (incp); - } - - defer_finalize_level--; - } - - /* All the deferred incomplete types have been processed so we can - now proceed with the finalization of the deferred types. */ - if (defer_finalize_level == 0 && defer_finalize_list) - { - unsigned int i; - tree t; - - for (i = 0; VEC_iterate (tree, defer_finalize_list, i, t); i++) - rest_of_type_decl_compilation_no_defer (t); - - VEC_free (tree, heap, defer_finalize_list); - } - } - - /* If we are not defining this type, see if it's in the incomplete list. - If so, handle that list entry now. */ - else if (!definition) - { - struct incomplete *incp; - - for (incp = defer_incomplete_list; incp; incp = incp->next) - if (incp->old_type && incp->full_type == gnat_entity) - { - update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type), - TREE_TYPE (gnu_decl)); - incp->old_type = NULL_TREE; - } - } - - if (this_global) - force_global--; - - if (Is_Packed_Array_Type (gnat_entity) - && Is_Itype (Associated_Node_For_Itype (gnat_entity)) - && No (Freeze_Node (Associated_Node_For_Itype (gnat_entity))) - && !present_gnu_tree (Associated_Node_For_Itype (gnat_entity))) - gnat_to_gnu_entity (Associated_Node_For_Itype (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; -} - -/* Wrap up compilation of DECL, a TYPE_DECL, possibly deferring it. - Every TYPE_DECL generated for a type definition must be passed - to this function once everything else has been done for it. */ - -void -rest_of_type_decl_compilation (tree decl) -{ - /* We need to defer finalizing the type if incomplete types - are being deferred or if they are being processed. */ - if (defer_incomplete_level || defer_finalize_level) - VEC_safe_push (tree, heap, defer_finalize_list, decl); - else - rest_of_type_decl_compilation_no_defer (decl); -} - -/* Same as above but without deferring the compilation. This - function should not be invoked directly on a TYPE_DECL. */ - -static void -rest_of_type_decl_compilation_no_defer (tree decl) -{ - const int toplev = global_bindings_p (); - tree t = TREE_TYPE (decl); - - rest_of_decl_compilation (decl, toplev, 0); - - /* Now process all the variants. This is needed for STABS. */ - for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t)) - { - if (t == TREE_TYPE (decl)) - continue; - - if (!TYPE_STUB_DECL (t)) - { - TYPE_STUB_DECL (t) = build_decl (TYPE_DECL, DECL_NAME (decl), t); - DECL_ARTIFICIAL (TYPE_STUB_DECL (t)) = 1; - } - - rest_of_type_compilation (t, toplev); - } -} - -/* Finalize any From_With_Type incomplete types. We do this after processing - our compilation unit and after processing its spec, if this is a body. */ - -void -finalize_from_with_types (void) -{ - struct incomplete *incp = defer_limited_with; - struct incomplete *next; - - defer_limited_with = 0; - for (; incp; incp = next) - { - next = incp->next; - - if (incp->old_type != 0) - update_pointer_to (TYPE_MAIN_VARIANT (incp->old_type), - gnat_to_gnu_type (incp->full_type)); - free (incp); - } -} - -/* 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 = ((Present (Equivalent_Type (gnat_entity))) - ? Equivalent_Type (gnat_entity) - : 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 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, by_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 (TREE_CODE (gnu_param_type) == RECORD_TYPE - && 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)))); - - /* VMS descriptors are themselves passed by reference. */ - if (mech == By_Short_Descriptor || - (mech == By_Descriptor && TARGET_ABI_OPEN_VMS && !TARGET_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_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))))) - { - gnu_param_type = build_reference_type (gnu_param_type); - by_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_COMPONENT_PTR_P (gnu_param) = by_component_ptr; - DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor || - mech == By_Short_Descriptor); - DECL_POINTS_TO_READONLY_P (gnu_param) - = (ro_param && (by_ref || by_component_ptr)); - - /* 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 specified by GNAT_TYPE and GNU_TYPE has - a non-aliased component in the back-end sense. */ - -static bool -array_type_has_nonaliased_component (Entity_Id gnat_type, tree gnu_type) -{ - /* If the type below this is a multi-array type, then - this does not have aliased components. */ - if (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE - && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type))) - return true; - - if (Has_Aliased_Components (gnat_type)) - return false; - - return type_for_nonaliased_component_p (TREE_TYPE (gnu_type)); -} - -/* 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 for avoiding static constraint error expression - is needed until 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"), - 1, 0, Needs_Debug_Info (gnat_entity)); - if (!Raises_Constraint_Error (gnat_hb)) - elaborate_expression (gnat_hb, gnat_entity, get_identifier ("U"), - 1, 0, Needs_Debug_Info (gnat_entity)); - break; - } - - case E_Record_Type: - { - Node_Id full_definition = Declaration_Node (gnat_entity); - Node_Id record_definition = Type_Definition (full_definition); - - /* If this is a record extension, go a level further to find the - record definition. */ - if (Nkind (record_definition) == N_Derived_Type_Definition) - record_definition = Record_Extension_Part (record_definition); - } - break; - - case E_Record_Subtype: - case E_Private_Subtype: - case E_Limited_Private_Subtype: - case E_Record_Subtype_With_Private: - if (Is_Constrained (gnat_entity) - && Has_Discriminants (Base_Type (gnat_entity)) - && Present (Discriminant_Constraint (gnat_entity))) - { - Node_Id gnat_discriminant_expr; - Entity_Id gnat_field; - - for (gnat_field = First_Discriminant (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), 1, 0, 0); - } - break; - - } -} - -/* Mark GNAT_ENTITY as going out of scope at this point. Recursively mark - any entities on its entity chain similarly. */ - -void -mark_out_of_scope (Entity_Id gnat_entity) -{ - Entity_Id gnat_sub_entity; - unsigned int kind = Ekind (gnat_entity); - - /* If this has an entity list, process all in the list. */ - if (IN (kind, Class_Wide_Kind) || IN (kind, Concurrent_Kind) - || IN (kind, Private_Kind) - || kind == E_Block || kind == E_Entry || kind == E_Entry_Family - || kind == E_Function || kind == E_Generic_Function - || kind == E_Generic_Package || kind == E_Generic_Procedure - || kind == E_Loop || kind == E_Operator || kind == E_Package - || kind == E_Package_Body || kind == E_Procedure - || kind == E_Record_Type || kind == E_Record_Subtype - || kind == E_Subprogram_Body || kind == E_Subprogram_Type) - for (gnat_sub_entity = First_Entity (gnat_entity); - Present (gnat_sub_entity); - gnat_sub_entity = Next_Entity (gnat_sub_entity)) - if (Scope (gnat_sub_entity) == gnat_entity - && gnat_sub_entity != gnat_entity) - mark_out_of_scope (gnat_sub_entity); - - /* Now clear this if it has been defined, but only do so if it isn't - a subprogram or parameter. We could refine this, but it isn't - worth it. If this is statically allocated, it is supposed to - hang around out of cope. */ - if (present_gnu_tree (gnat_entity) && !Is_Statically_Allocated (gnat_entity) - && kind != E_Procedure && kind != E_Function && !IN (kind, Formal_Kind)) - { - save_gnu_tree (gnat_entity, NULL_TREE, true); - save_gnu_tree (gnat_entity, error_mark_node, true); - } -} - -/* Relate the alias sets of GNU_NEW_TYPE and GNU_OLD_TYPE according to OP. - If this is a multi-dimensional array type, do this recursively. - - OP may be - - ALIAS_SET_COPY: the new set is made a copy of the old one. - - ALIAS_SET_SUPERSET: the new set is made a superset of the old one. - - ALIAS_SET_SUBSET: the new set is made a subset of the old one. */ - -static void -relate_alias_sets (tree gnu_new_type, tree gnu_old_type, enum alias_set_op op) -{ - /* Remove any padding from GNU_OLD_TYPE. It doesn't matter in the case - of a one-dimensional array, since the padding has the same alias set - as the field type, but if it's a multi-dimensional array, we need to - see the inner types. */ - while (TREE_CODE (gnu_old_type) == RECORD_TYPE - && (TYPE_JUSTIFIED_MODULAR_P (gnu_old_type) - || TYPE_IS_PADDING_P (gnu_old_type))) - gnu_old_type = TREE_TYPE (TYPE_FIELDS (gnu_old_type)); - - /* Unconstrained array types are deemed incomplete and would thus be given - alias set 0. Retrieve the underlying array type. */ - if (TREE_CODE (gnu_old_type) == UNCONSTRAINED_ARRAY_TYPE) - gnu_old_type - = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_old_type)))); - if (TREE_CODE (gnu_new_type) == UNCONSTRAINED_ARRAY_TYPE) - gnu_new_type - = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_new_type)))); - - if (TREE_CODE (gnu_new_type) == ARRAY_TYPE - && TREE_CODE (TREE_TYPE (gnu_new_type)) == ARRAY_TYPE - && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_new_type))) - relate_alias_sets (TREE_TYPE (gnu_new_type), TREE_TYPE (gnu_old_type), op); - - switch (op) - { - case ALIAS_SET_COPY: - /* The alias set shouldn't be copied between array types with different - aliasing settings because this can break the aliasing relationship - between the array type and its element type. */ -#ifndef ENABLE_CHECKING - if (flag_strict_aliasing) -#endif - gcc_assert (!(TREE_CODE (gnu_new_type) == ARRAY_TYPE - && TREE_CODE (gnu_old_type) == ARRAY_TYPE - && TYPE_NONALIASED_COMPONENT (gnu_new_type) - != TYPE_NONALIASED_COMPONENT (gnu_old_type))); - - TYPE_ALIAS_SET (gnu_new_type) = get_alias_set (gnu_old_type); - break; - - case ALIAS_SET_SUBSET: - case ALIAS_SET_SUPERSET: - { - alias_set_type old_set = get_alias_set (gnu_old_type); - alias_set_type new_set = get_alias_set (gnu_new_type); - - /* Do nothing if the alias sets conflict. This ensures that we - never call record_alias_subset several times for the same pair - or at all for alias set 0. */ - if (!alias_sets_conflict_p (old_set, new_set)) - { - if (op == ALIAS_SET_SUBSET) - record_alias_subset (old_set, new_set); - else - record_alias_subset (new_set, old_set); - } - } - break; - - default: - gcc_unreachable (); - } - - record_component_aliases (gnu_new_type); -} - -/* Return a TREE_LIST describing the substitutions needed to reflect - discriminant substitutions from GNAT_SUBTYPE to GNAT_TYPE and add - them to GNU_LIST. If GNAT_TYPE is not specified, use the base type - of GNAT_SUBTYPE. The substitutions can be in any order. TREE_PURPOSE - gives the tree for the discriminant and TREE_VALUES is the replacement - value. They are in the form of operands to substitute_in_expr. - DEFINITION is as in gnat_to_gnu_entity. */ - -static tree -substitution_list (Entity_Id gnat_subtype, Entity_Id gnat_type, - tree gnu_list, bool definition) -{ - Entity_Id gnat_discrim; - Node_Id gnat_value; - - if (No (gnat_type)) - gnat_type = Implementation_Base_Type (gnat_subtype); - - if (Has_Discriminants (gnat_type)) - 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)))) - gnu_list = tree_cons (gnat_to_gnu_field_decl (gnat_discrim), - elaborate_expression - (Node (gnat_value), gnat_subtype, - get_entity_name (gnat_discrim), definition, - 1, 0), - gnu_list); - - return gnu_list; -} - -/* Return true if the size 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) -{ - HOST_WIDE_INT our_size; - - /* If this is not a static allocation, the only case we want to forbid - is an overflowing size. That will be converted into a raise a - Storage_Error. */ - if (!static_p) - return !(TREE_CODE (gnu_size) == INTEGER_CST - && TREE_OVERFLOW (gnu_size)); - - /* Otherwise, we need to deal with both variable sizes and constant - sizes that won't fit in a host int. We use int instead of HOST_WIDE_INT - since assemblers may not like very large sizes. */ - if (!host_integerp (gnu_size, 1)) - return false; - - our_size = tree_low_cst (gnu_size, 1); - return (int) our_size == our_size; -} - -/* 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; - - 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; - - if (Present (gnat_assoc) && Present (First (gnat_assoc)) - && Present (Next (First (gnat_assoc))) - && (Nkind (Expression (Next (First (gnat_assoc)))) - == N_String_Literal)) - { - gnu_arg0 = get_identifier (TREE_STRING_POINTER - (gnat_to_gnu - (Expression (Next - (First (gnat_assoc)))))); - if (Present (Next (Next (First (gnat_assoc)))) - && (Nkind (Expression (Next (Next (First (gnat_assoc))))) - == N_String_Literal)) - gnu_arg1 = get_identifier (TREE_STRING_POINTER - (gnat_to_gnu - (Expression - (Next (Next - (First (gnat_assoc))))))); - } - - 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; - - default: - continue; - } - - - /* 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); - } -} - -/* Get the unpadded version of a GNAT type. */ - -tree -get_unpadded_type (Entity_Id gnat_entity) -{ - tree type = gnat_to_gnu_type (gnat_entity); - - if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type)) - type = TREE_TYPE (TYPE_FIELDS (type)); - - return type; -} - -/* Called when we need to protect a variable object using a save_expr. */ - -tree -maybe_variable (tree gnu_operand) -{ - if (TREE_CONSTANT (gnu_operand) || TREE_READONLY (gnu_operand) - || TREE_CODE (gnu_operand) == SAVE_EXPR - || TREE_CODE (gnu_operand) == NULL_EXPR) - return gnu_operand; - - if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF) - { - tree gnu_result = build1 (UNCONSTRAINED_ARRAY_REF, - TREE_TYPE (gnu_operand), - variable_size (TREE_OPERAND (gnu_operand, 0))); - - TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result) - = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand))); - return gnu_result; - } - else - return variable_size (gnu_operand); -} - -/* 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 - qualification to use if an external name is appropriate and DEFINITION is - nonzero if this is a definition of GNAT_ENTITY. If NEED_VALUE is nonzero, - we need a result. Otherwise, we are just elaborating this for - side-effects. If NEED_DEBUG is nonzero we need the symbol 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. */ - else if (!need_value - && (Is_OK_Static_Expression (gnat_expr) - || (Nkind (gnat_expr) == N_Identifier - && Ekind (Entity (gnat_expr)) == E_Discriminant))) - return 0; - - /* Otherwise, convert this tree to its GCC equivalent. */ - gnu_expr - = elaborate_expression_1 (gnat_expr, gnat_entity, gnat_to_gnu (gnat_expr), - 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. */ - -static tree -elaborate_expression_1 (Node_Id gnat_expr, Entity_Id gnat_entity, - tree gnu_expr, tree gnu_name, bool definition, - bool need_debug) -{ - tree gnu_decl = NULL_TREE; - /* Skip any conversions and simple arithmetics to see if the expression - is a read-only variable. - ??? This really should remain read-only, but we have to think about - the typing of the tree here. */ - tree gnu_inner_expr - = skip_simple_arithmetic (remove_conversions (gnu_expr, true)); - bool expr_global = Is_Public (gnat_entity) || global_bindings_p (); - bool expr_variable; - - /* In most cases, we won't see a naked FIELD_DECL here 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 - here. We have to 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 is neither a placeholder nor a constant, nor a variable - that is read-only, make a variable that is initialized to contain the - bound when the package containing the definition is elaborated. If - this entity is defined at top level and a bound or discriminant value - isn't a constant or a reference to a discriminant, replace the bound - by the variable; otherwise use a SAVE_EXPR if needed. Note that we - rely here on the fact that an expression cannot contain both the - discriminant and some other variable. */ - - expr_variable = (!CONSTANT_CLASS_P (gnu_expr) - && !(TREE_CODE (gnu_inner_expr) == VAR_DECL - && (TREE_READONLY (gnu_inner_expr) - || DECL_READONLY_ONCE_ELAB (gnu_inner_expr))) - && !CONTAINS_PLACEHOLDER_P (gnu_expr)); - - /* If this is a static expression or contains a discriminant, we don't - need the variable for debugging (and can't elaborate anyway if a - discriminant). */ - if (need_debug - && (Is_OK_Static_Expression (gnat_expr) - || CONTAINS_PLACEHOLDER_P (gnu_expr))) - need_debug = false; - - /* Now create the variable if we need it. */ - if (need_debug || (expr_variable && expr_global)) - gnu_decl - = create_var_decl (create_concat_name (gnat_entity, - IDENTIFIER_POINTER (gnu_name)), - NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr, - !need_debug, Is_Public (gnat_entity), - !definition, false, NULL, gnat_entity); - - /* We only need to use this variable if we are in global context since GCC - can do the right thing in the local case. */ - if (expr_global && expr_variable) - return gnu_decl; - else if (!expr_variable) - return gnu_expr; - else - return maybe_variable (gnu_expr); -} - -/* Create a record type that contains a SIZE bytes long field of TYPE with a - starting bit position so that it is aligned to ALIGN bits, and leaving at - least ROOM bytes free before the field. BASE_ALIGN is the alignment the - record is guaranteed to get. */ - -tree -make_aligning_type (tree type, unsigned int align, tree size, - unsigned int base_align, int room) -{ - /* We will be crafting a record type with one field at a position set to be - the next multiple of ALIGN past record'address + room bytes. We use a - record placeholder to express record'address. */ - - tree record_type = make_node (RECORD_TYPE); - tree record = build0 (PLACEHOLDER_EXPR, record_type); - - tree record_addr_st - = convert (sizetype, build_unary_op (ADDR_EXPR, NULL_TREE, record)); - - /* The diagram below summarizes the shape of what we manipulate: - - <--------- pos ----------> - { +------------+-------------+-----------------+ - record =>{ |############| ... | field (type) | - { +------------+-------------+-----------------+ - |<-- room -->|<- voffset ->|<---- size ----->| - o o - | | - record_addr vblock_addr - - Every length is in sizetype bytes there, except "pos" which has to be - set as a bit position in the GCC tree for the record. */ - - tree room_st = size_int (room); - tree vblock_addr_st = size_binop (PLUS_EXPR, record_addr_st, room_st); - tree voffset_st, pos, field; - - tree name = TYPE_NAME (type); - - if (TREE_CODE (name) == TYPE_DECL) - name = DECL_NAME (name); - - TYPE_NAME (record_type) = concat_id_with_name (name, "_ALIGN"); - - /* Compute VOFFSET and then POS. The next byte position multiple of some - alignment after some address is obtained by "and"ing the alignment minus - 1 with the two's complement of the address. */ - - voffset_st = size_binop (BIT_AND_EXPR, - size_diffop (size_zero_node, vblock_addr_st), - ssize_int ((align / BITS_PER_UNIT) - 1)); - - /* POS = (ROOM + VOFFSET) * BIT_PER_UNIT, in bitsizetype. */ - - pos = size_binop (MULT_EXPR, - convert (bitsizetype, - size_binop (PLUS_EXPR, room_st, voffset_st)), - bitsize_unit_node); - - /* Craft the GCC record representation. We exceptionally do everything - manually here because 1) our generic circuitry is not quite ready to - handle the complex position/size expressions we are setting up, 2) we - have a strong simplifying factor at hand: we know the maximum possible - value of voffset, and 3) we have to set/reset at least the sizes in - accordance with this maximum value anyway, as we need them to convey - what should be "alloc"ated for this type. - - Use -1 as the 'addressable' indication for the field to prevent the - creation of a bitfield. We don't need one, it would have damaging - consequences on the alignment computation, and create_field_decl would - make one without this special argument, for instance because of the - complex position expression. */ - - field = create_field_decl (get_identifier ("F"), type, record_type, - 1, size, pos, -1); - TYPE_FIELDS (record_type) = field; - - TYPE_ALIGN (record_type) = base_align; - TYPE_USER_ALIGN (record_type) = 1; - - TYPE_SIZE (record_type) - = size_binop (PLUS_EXPR, - size_binop (MULT_EXPR, convert (bitsizetype, size), - bitsize_unit_node), - bitsize_int (align + room * BITS_PER_UNIT)); - TYPE_SIZE_UNIT (record_type) - = size_binop (PLUS_EXPR, size, - size_int (room + align / BITS_PER_UNIT)); - - SET_TYPE_MODE (record_type, BLKmode); - - relate_alias_sets (record_type, type, ALIAS_SET_COPY); - return record_type; -} - -/* Return the result of rounding T up to ALIGN. */ - -static inline unsigned HOST_WIDE_INT -round_up_to_align (unsigned HOST_WIDE_INT t, unsigned int align) -{ - t += align - 1; - t /= align; - t *= align; - return t; -} - -/* TYPE is a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE that is being used - as the field type of a packed record if IN_RECORD is true, or as the - component type of a packed array if IN_RECORD is false. See if we can - rewrite it either as a type that has a non-BLKmode, which we can pack - tighter in the packed record case, or as a smaller type. If so, return - the new type. If not, return the original type. */ - -static tree -make_packable_type (tree type, bool in_record) -{ - unsigned HOST_WIDE_INT size = tree_low_cst (TYPE_SIZE (type), 1); - unsigned HOST_WIDE_INT new_size; - tree new_type, old_field, field_list = NULL_TREE; - - /* No point in doing anything if the size is zero. */ - if (size == 0) - return type; - - new_type = make_node (TREE_CODE (type)); - - /* Copy the name and flags from the old type to that of the new. - Note that we rely on the pointer equality created here for - TYPE_NAME to look through conversions in various places. */ - TYPE_NAME (new_type) = TYPE_NAME (type); - TYPE_JUSTIFIED_MODULAR_P (new_type) = TYPE_JUSTIFIED_MODULAR_P (type); - TYPE_CONTAINS_TEMPLATE_P (new_type) = TYPE_CONTAINS_TEMPLATE_P (type); - if (TREE_CODE (type) == RECORD_TYPE) - TYPE_IS_PADDING_P (new_type) = TYPE_IS_PADDING_P (type); - - /* If we are in a record and have a small size, set the alignment to - try for an integral mode. Otherwise set it to try for a smaller - type with BLKmode. */ - if (in_record && size <= MAX_FIXED_MODE_SIZE) - { - TYPE_ALIGN (new_type) = ceil_alignment (size); - new_size = round_up_to_align (size, TYPE_ALIGN (new_type)); - } - else - { - unsigned HOST_WIDE_INT align; - - /* Do not try to shrink the size if the RM size is not constant. */ - if (TYPE_CONTAINS_TEMPLATE_P (type) - || !host_integerp (TYPE_ADA_SIZE (type), 1)) - return type; - - /* Round the RM size up to a unit boundary to get the minimal size - for a BLKmode record. Give up if it's already the size. */ - new_size = TREE_INT_CST_LOW (TYPE_ADA_SIZE (type)); - new_size = round_up_to_align (new_size, BITS_PER_UNIT); - if (new_size == size) - return type; - - align = new_size & -new_size; - TYPE_ALIGN (new_type) = MIN (TYPE_ALIGN (type), align); - } - - TYPE_USER_ALIGN (new_type) = 1; - - /* Now copy the fields, keeping the position and size as we don't want - to change the layout by propagating the packedness downwards. */ - for (old_field = TYPE_FIELDS (type); old_field; - old_field = TREE_CHAIN (old_field)) - { - tree new_field_type = TREE_TYPE (old_field); - tree new_field, new_size; - - if ((TREE_CODE (new_field_type) == RECORD_TYPE - || TREE_CODE (new_field_type) == UNION_TYPE - || TREE_CODE (new_field_type) == QUAL_UNION_TYPE) - && !TYPE_IS_FAT_POINTER_P (new_field_type) - && host_integerp (TYPE_SIZE (new_field_type), 1)) - new_field_type = make_packable_type (new_field_type, true); - - /* However, for the last field in a not already packed record type - that is of an aggregate type, we need to use the RM_Size in the - packable version of the record type, see finish_record_type. */ - if (!TREE_CHAIN (old_field) - && !TYPE_PACKED (type) - && (TREE_CODE (new_field_type) == RECORD_TYPE - || TREE_CODE (new_field_type) == UNION_TYPE - || TREE_CODE (new_field_type) == QUAL_UNION_TYPE) - && !TYPE_IS_FAT_POINTER_P (new_field_type) - && !TYPE_CONTAINS_TEMPLATE_P (new_field_type) - && TYPE_ADA_SIZE (new_field_type)) - new_size = TYPE_ADA_SIZE (new_field_type); - else - new_size = DECL_SIZE (old_field); - - new_field = create_field_decl (DECL_NAME (old_field), new_field_type, - new_type, TYPE_PACKED (type), new_size, - bit_position (old_field), - !DECL_NONADDRESSABLE_P (old_field)); - - DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field); - SET_DECL_ORIGINAL_FIELD - (new_field, (DECL_ORIGINAL_FIELD (old_field) - ? DECL_ORIGINAL_FIELD (old_field) : old_field)); - - if (TREE_CODE (new_type) == QUAL_UNION_TYPE) - DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field); - - TREE_CHAIN (new_field) = field_list; - field_list = new_field; - } - - finish_record_type (new_type, nreverse (field_list), 2, true); - relate_alias_sets (new_type, type, ALIAS_SET_COPY); - - /* If this is a padding record, we never want to make the size smaller - than what was specified. For QUAL_UNION_TYPE, also copy the size. */ - if ((TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type)) - || TREE_CODE (type) == QUAL_UNION_TYPE) - { - TYPE_SIZE (new_type) = TYPE_SIZE (type); - TYPE_SIZE_UNIT (new_type) = TYPE_SIZE_UNIT (type); - } - else - { - TYPE_SIZE (new_type) = bitsize_int (new_size); - TYPE_SIZE_UNIT (new_type) - = size_int ((new_size + BITS_PER_UNIT - 1) / BITS_PER_UNIT); - } - - if (!TYPE_CONTAINS_TEMPLATE_P (type)) - SET_TYPE_ADA_SIZE (new_type, TYPE_ADA_SIZE (type)); - - compute_record_mode (new_type); - - /* Try harder to get a packable type if necessary, for example - in case the record itself contains a BLKmode field. */ - if (in_record && TYPE_MODE (new_type) == BLKmode) - SET_TYPE_MODE (new_type, - mode_for_size_tree (TYPE_SIZE (new_type), MODE_INT, 1)); - - /* If neither the mode nor the size has shrunk, return the old type. */ - if (TYPE_MODE (new_type) == BLKmode && new_size >= size) - return type; - - return new_type; -} - -/* Ensure that TYPE has SIZE and ALIGN. Make and return a new padded type - if needed. We have already verified that SIZE and TYPE are large enough. - - GNAT_ENTITY and NAME_TRAILER are used to name the resulting record and - to issue a warning. - - IS_USER_TYPE is true if we must complete the original type. - - DEFINITION is true if this type is being defined. - - SAME_RM_SIZE is true if the RM_Size of the resulting type is to be set - to SIZE too; otherwise, it's set to the RM_Size of the original type. */ - -tree -maybe_pad_type (tree type, tree size, unsigned int align, - Entity_Id gnat_entity, const char *name_trailer, - bool is_user_type, bool definition, bool same_rm_size) -{ - tree orig_rm_size = same_rm_size ? NULL_TREE : rm_size (type); - tree orig_size = TYPE_SIZE (type); - unsigned int orig_align = align; - tree record, field; - - /* If TYPE is a padded type, see if it agrees with any size and alignment - we were given. If so, return the original type. Otherwise, strip - off the padding, since we will either be returning the inner type - or repadding it. If no size or alignment is specified, use that of - the original padded type. */ - if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type)) - { - if ((!size - || operand_equal_p (round_up (size, - MAX (align, TYPE_ALIGN (type))), - round_up (TYPE_SIZE (type), - MAX (align, TYPE_ALIGN (type))), - 0)) - && (align == 0 || align == TYPE_ALIGN (type))) - return type; - - if (!size) - size = TYPE_SIZE (type); - if (align == 0) - align = TYPE_ALIGN (type); - - type = TREE_TYPE (TYPE_FIELDS (type)); - orig_size = TYPE_SIZE (type); - } - - /* If the size is either not being changed or is being made smaller (which - is not done here (and is only valid for bitfields anyway), show the size - isn't changing. Likewise, clear the alignment if it isn't being - changed. Then return if we aren't doing anything. */ - if (size - && (operand_equal_p (size, orig_size, 0) - || (TREE_CODE (orig_size) == INTEGER_CST - && tree_int_cst_lt (size, orig_size)))) - size = NULL_TREE; - - if (align == TYPE_ALIGN (type)) - align = 0; - - if (align == 0 && !size) - return type; - - /* If requested, complete the original type and give it a name. */ - if (is_user_type) - create_type_decl (get_entity_name (gnat_entity), type, - NULL, !Comes_From_Source (gnat_entity), - !(TYPE_NAME (type) - && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL - && DECL_IGNORED_P (TYPE_NAME (type))), - gnat_entity); - - /* We used to modify the record in place in some cases, but that could - generate incorrect debugging information. So make a new record - type and name. */ - record = make_node (RECORD_TYPE); - TYPE_IS_PADDING_P (record) = 1; - - if (Present (gnat_entity)) - TYPE_NAME (record) = create_concat_name (gnat_entity, name_trailer); - - TYPE_VOLATILE (record) - = Present (gnat_entity) && Treat_As_Volatile (gnat_entity); - - TYPE_ALIGN (record) = align; - if (orig_align) - TYPE_USER_ALIGN (record) = align; - - TYPE_SIZE (record) = size ? size : orig_size; - TYPE_SIZE_UNIT (record) - = convert (sizetype, - size_binop (CEIL_DIV_EXPR, TYPE_SIZE (record), - bitsize_unit_node)); - - /* If we are changing the alignment and the input type is a record with - BLKmode and a small constant size, try to make a form that has an - integral mode. This might allow the padding record to also have an - integral mode, which will be much more efficient. There is no point - in doing so if a size is specified unless it is also a small constant - size and it is incorrect to do so if we cannot guarantee that the mode - will be naturally aligned since the field must always be addressable. - - ??? This might not always be a win when done for a stand-alone object: - since the nominal and the effective type of the object will now have - different modes, a VIEW_CONVERT_EXPR will be required for converting - between them and it might be hard to overcome afterwards, including - at the RTL level when the stand-alone object is accessed as a whole. */ - if (align != 0 - && TREE_CODE (type) == RECORD_TYPE - && TYPE_MODE (type) == BLKmode - && TREE_CODE (orig_size) == INTEGER_CST - && !TREE_OVERFLOW (orig_size) - && compare_tree_int (orig_size, MAX_FIXED_MODE_SIZE) <= 0 - && (!size - || (TREE_CODE (size) == INTEGER_CST - && compare_tree_int (size, MAX_FIXED_MODE_SIZE) <= 0))) - { - tree packable_type = make_packable_type (type, true); - if (TYPE_MODE (packable_type) != BLKmode - && align >= TYPE_ALIGN (packable_type)) - type = packable_type; - } - - /* Now create the field with the original size. */ - field = create_field_decl (get_identifier ("F"), type, record, 0, - orig_size, bitsize_zero_node, 1); - DECL_INTERNAL_P (field) = 1; - - /* Do not finalize it until after the auxiliary record is built. */ - finish_record_type (record, field, 1, true); - - /* Set the same size for its RM_size if requested; otherwise reuse - the RM_size of the original type. */ - SET_TYPE_ADA_SIZE (record, same_rm_size ? size : orig_rm_size); - - /* Unless debugging information isn't being written for the input 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 (TYPE_NAME (record) - && AGGREGATE_TYPE_P (type) - && TREE_CODE (orig_size) != INTEGER_CST - && !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL - && DECL_IGNORED_P (TYPE_NAME (type)))) - { - tree marker = make_node (RECORD_TYPE); - tree name = TYPE_NAME (record); - tree orig_name = TYPE_NAME (type); - - if (TREE_CODE (name) == TYPE_DECL) - name = DECL_NAME (name); - - if (TREE_CODE (orig_name) == TYPE_DECL) - orig_name = DECL_NAME (orig_name); - - TYPE_NAME (marker) = concat_id_with_name (name, "XVS"); - finish_record_type (marker, - create_field_decl (orig_name, integer_type_node, - marker, 0, NULL_TREE, NULL_TREE, - 0), - 0, false); - - add_parallel_type (TYPE_STUB_DECL (record), marker); - - if (size && TREE_CODE (size) != INTEGER_CST && definition) - create_var_decl (concat_id_with_name (name, "XVZ"), NULL_TREE, - sizetype, TYPE_SIZE_UNIT (record), false, false, - false, false, NULL, gnat_entity); - } - - rest_of_record_type_compilation (record); - - /* If the size was widened explicitly, maybe give a warning. Take the - original size as the maximum size of the input if there was an - unconstrained record involved and round it up to the specified alignment, - if one was specified. */ - if (CONTAINS_PLACEHOLDER_P (orig_size)) - orig_size = max_size (orig_size, true); - - if (align) - orig_size = round_up (orig_size, align); - - if (size && Present (gnat_entity) - && !operand_equal_p (size, orig_size, 0) - && !(TREE_CODE (size) == INTEGER_CST - && TREE_CODE (orig_size) == INTEGER_CST - && tree_int_cst_lt (size, orig_size))) - { - Node_Id gnat_error_node = Empty; - - if (Is_Packed_Array_Type (gnat_entity)) - gnat_entity = Original_Array_Type (gnat_entity); - - if ((Ekind (gnat_entity) == E_Component - || Ekind (gnat_entity) == E_Discriminant) - && Present (Component_Clause (gnat_entity))) - gnat_error_node = Last_Bit (Component_Clause (gnat_entity)); - else if (Present (Size_Clause (gnat_entity))) - gnat_error_node = Expression (Size_Clause (gnat_entity)); - - /* Generate message only for entities that come from source, since - if we have an entity created by expansion, the message will be - generated for some other corresponding source entity. */ - if (Comes_From_Source (gnat_entity) && Present (gnat_error_node)) - post_error_ne_tree ("{^ }bits of & unused?", gnat_error_node, - gnat_entity, - size_diffop (size, orig_size)); - - else if (*name_trailer == 'C' && !Is_Internal (gnat_entity)) - post_error_ne_tree ("component of& padded{ by ^ bits}?", - gnat_entity, gnat_entity, - size_diffop (size, orig_size)); - } - - return record; -} - -/* 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 = integer_zero_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)); - - /* There's no good type to use here, so we might as well use - integer_type_node. */ - this_test - = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node, - build_binary_op (GE_EXPR, integer_type_node, - operand, low), - build_binary_op (LE_EXPR, integer_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, integer_type_node, - build_binary_op (GE_EXPR, integer_type_node, - operand, low), - build_binary_op (LE_EXPR, integer_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, integer_type_node, - build_binary_op (GE_EXPR, integer_type_node, - operand, low), - build_binary_op (LE_EXPR, integer_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, integer_type_node, operand, - single); - break; - - case N_Others_Choice: - this_test = integer_one_node; - break; - - default: - gcc_unreachable (); - } - - result = build_binary_op (TRUTH_ORIF_EXPR, integer_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 (is_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. */ - -static tree -gnat_to_gnu_field (Entity_Id gnat_field, tree gnu_record_type, int packed, - bool definition) -{ - tree gnu_field_id = get_entity_name (gnat_field); - tree gnu_field_type = gnat_to_gnu_type (Etype (gnat_field)); - tree gnu_field, gnu_size, gnu_pos; - bool needs_strict_alignment - = (Is_Aliased (gnat_field) || Strict_Alignment (Etype (gnat_field)) - || Treat_As_Volatile (gnat_field)); - - /* 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_Static_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 (Etype (gnat_field)), gnu_field_type, - gnat_field, FIELD_DECL, false, true); - else - gnu_size = NULL_TREE; - - /* If we have a specified size that's smaller than that of the field type, - or a position is specified, and the field type is a record, 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. - - Doing this is first useful if the record is packed because we may 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 references, because - GCC does not handle BLKmode bitfields properly. - - 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. - - Besides, we don't even look the possibility of a transformation in cases - known to be in error already, for instance when an invalid size results - from a component clause. */ - - if (TREE_CODE (gnu_field_type) == RECORD_TYPE - && !TYPE_IS_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)))))) - { - /* See what the alternate type and size would be. */ - tree gnu_packable_type = make_packable_type (gnu_field_type, true); - - bool has_byte_aligned_clause - = Present (Component_Clause (gnat_field)) - && (UI_To_Int (Component_Bit_Offset (gnat_field)) - % BITS_PER_UNIT == 0); - - /* Compute whether we should avoid the substitution. */ - bool reject - /* There is no point substituting if there is no change... */ - = (gnu_packable_type == gnu_field_type) - /* ... nor when the field is known to be byte aligned and not to - share a byte with another field. */ - || (has_byte_aligned_clause - && value_factor_p (gnu_size, BITS_PER_UNIT)) - /* The size of an aliased field must be an exact multiple of the - type's alignment, which the substitution might increase. Reject - substitutions that would so invalidate a component clause when the - specified position is byte aligned, as the change would have no - real benefit from the packing standpoint anyway. */ - || (Is_Aliased (gnat_field) - && has_byte_aligned_clause - && !value_factor_p (gnu_size, TYPE_ALIGN (gnu_packable_type))); - - /* Substitute unless told otherwise. */ - if (!reject) - { - gnu_field_type = gnu_packable_type; - - if (!gnu_size) - gnu_size = rm_size (gnu_field_type); - } - } - - /* 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); - - if (Present (Component_Clause (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. */ - if (Present (Parent_Subtype (Underlying_Type (Scope (gnat_field))))) - { - tree gnu_parent - = gnat_to_gnu_type (Parent_Subtype - (Underlying_Type (Scope (gnat_field)))); - - 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, ensure the record is - sufficiently aligned and that that position and size are - consistent with the alignment. */ - if (needs_strict_alignment) - { - 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 (Etype (gnat_field))) - 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_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 (Etype (gnat_field))) - 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)); - - gnu_size = NULL_TREE; - } - - if (!integer_zerop (size_binop - (TRUNC_MOD_EXPR, gnu_pos, - bitsize_int (TYPE_ALIGN (gnu_field_type))))) - { - 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 (Treat_As_Volatile (gnat_field)) - 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 (Strict_Alignment (Etype (gnat_field))) - post_error_ne_num - ("position of & with aliased or tagged components not multiple of ^ bits", - First_Bit (Component_Clause (gnat_field)), gnat_field, - TYPE_ALIGN (gnu_field_type)); - - else - gcc_unreachable (); - - gnu_pos = NULL_TREE; - } - } - - if (Is_Atomic (gnat_field)) - check_ok_for_atomic (gnu_field_type, gnat_field, false); - } - - /* 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; - - /* 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 (Etype (gnat_field)))) - { - 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) - { - /* 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)); - - gnu_field_type - = make_type_from_size (gnu_field_type, gnu_size, - Has_Biased_Representation (gnat_field)); - gnu_field_type = maybe_pad_type (gnu_field_type, gnu_size, 0, gnat_field, - "PAD", false, definition, true); - } - - /* 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, - packed, gnu_size, gnu_pos, - Is_Aliased (gnat_field)); - Sloc_to_locus (Sloc (gnat_field), &DECL_SOURCE_LOCATION (gnu_field)); - TREE_THIS_VOLATILE (gnu_field) = Treat_As_Volatile (gnat_field); - - 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 TYPE is a type with variable size, a padding type with a - field of variable size or is a record that has a field such a field. */ - -static bool -is_variable_size (tree type) -{ - tree field; - - if (!TREE_CONSTANT (TYPE_SIZE (type))) - return true; - - if (TREE_CODE (type) == RECORD_TYPE - && TYPE_IS_PADDING_P (type) - && !TREE_CONSTANT (DECL_SIZE (TYPE_FIELDS (type)))) - return true; - - if (TREE_CODE (type) != RECORD_TYPE - && TREE_CODE (type) != UNION_TYPE - && TREE_CODE (type) != QUAL_UNION_TYPE) - return false; - - for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) - if (is_variable_size (TREE_TYPE (field))) - return true; - - return false; -} - -/* 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)); -} - -/* Return a GCC tree for a record type given a GNAT Component_List and a chain - of GCC trees for fields that are in the record and have already been - processed. When called from gnat_to_gnu_entity during the processing of a - record type definition, the GCC nodes for the discriminants will be on - the chain. The other calls to this function are recursive calls from - itself for the Component_List of a variant and the chain 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. - - P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field - with a rep clause is to be added. If it is nonzero, that is all that - should be done with such fields. - - CANCEL_ALIGNMENT, if true, means the alignment should be zeroed before - laying out the record. This means the alignment only serves to force fields - to be bitfields, but not require the record to be that aligned. This is - used for variants. - - ALL_REP, if true, means a rep clause was found for all the fields. This - simplifies the logic since we know we're not in the mixed case. - - DO_NOT_FINALIZE, if true, means that the record type is expected to be - modified afterwards so it will not be sent to the back-end for finalization. - - UNCHECKED_UNION, if true, means that we are building a type for a record - with a Pragma Unchecked_Union. - - The processing of the component list fills in the chain with all of the - fields of the record and then the record type is finished. */ - -static void -components_to_record (tree gnu_record_type, Node_Id component_list, - tree gnu_field_list, int packed, bool definition, - tree *p_gnu_rep_list, bool cancel_alignment, - bool all_rep, bool do_not_finalize, bool unchecked_union) -{ - Node_Id component_decl; - Entity_Id gnat_field; - Node_Id variant_part; - tree gnu_our_rep_list = NULL_TREE; - tree gnu_field, gnu_last; - bool layout_with_rep = false; - bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type); - - /* For each variable within each component declaration create a GCC field - and add it to the list, skipping any pragmas in the list. */ - if (Present (Component_Items (component_list))) - for (component_decl = First_Non_Pragma (Component_Items (component_list)); - Present (component_decl); - component_decl = Next_Non_Pragma (component_decl)) - { - gnat_field = Defining_Entity (component_decl); - - if (Chars (gnat_field) == Name_uParent) - gnu_field = tree_last (TYPE_FIELDS (gnu_record_type)); - else - { - gnu_field = gnat_to_gnu_field (gnat_field, gnu_record_type, - packed, definition); - - /* If this is the _Tag field, put it before any discriminants, - instead of after them as is the case for all other fields. */ - if (Chars (gnat_field) == Name_uTag) - gnu_field_list = chainon (gnu_field_list, gnu_field); - else - { - TREE_CHAIN (gnu_field) = gnu_field_list; - gnu_field_list = gnu_field; - } - } - - 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 (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)) - { - tree gnu_discriminant = gnat_to_gnu (Name (variant_part)); - Node_Id variant; - tree gnu_name = TYPE_NAME (gnu_record_type); - tree gnu_var_name - = concat_id_with_name (get_identifier (Get_Name_String - (Chars (Name (variant_part)))), - "XVN"); - tree gnu_union_type; - tree gnu_union_name; - tree gnu_union_field; - tree gnu_variant_list = NULL_TREE; - - if (TREE_CODE (gnu_name) == TYPE_DECL) - gnu_name = DECL_NAME (gnu_name); - - gnu_union_name = concat_id_with_name (gnu_name, - IDENTIFIER_POINTER (gnu_var_name)); - - /* Reuse an enclosing union if all fields are in the variant part - and there is no representation clause on the record, to match - the layout of C unions. There is an associated check below. */ - if (!gnu_field_list - && TREE_CODE (gnu_record_type) == UNION_TYPE - && !TYPE_PACKED (gnu_record_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); - } - - 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 (Name_Buffer); - TYPE_NAME (gnu_variant_type) - = concat_id_with_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 fields - have record rep clauses, we can propagate the size into the - variant part. */ - 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); - } - - /* Create the record type for the variant. Note that we defer - finalizing it until after we are sure to actually use it. */ - components_to_record (gnu_variant_type, Component_List (variant), - NULL_TREE, packed, definition, - &gnu_our_rep_list, !all_rep_and_size, all_rep, - true, unchecked_union); - - gnu_qual = choices_to_gnu (gnu_discriminant, - Discrete_Choices (variant)); - - Set_Present_Expr (variant, annotate_value (gnu_qual)); - - /* If this is an Unchecked_Union and we have exactly one field, - use this field directly to match the layout of C unions. */ - if (unchecked_union - && TYPE_FIELDS (gnu_variant_type) - && !TREE_CHAIN (TYPE_FIELDS (gnu_variant_type))) - gnu_field = TYPE_FIELDS (gnu_variant_type); - else - { - /* Deal with packedness like in gnat_to_gnu_field. */ - int 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); - - gnu_field = create_field_decl (gnu_inner_name, gnu_variant_type, - gnu_union_type, field_packed, - (all_rep_and_size - ? TYPE_SIZE (gnu_variant_type) - : 0), - (all_rep_and_size - ? bitsize_zero_node : 0), - 0); - - DECL_INTERNAL_P (gnu_field) = 1; - - if (!unchecked_union) - DECL_QUALIFIER (gnu_field) = gnu_qual; - } - - TREE_CHAIN (gnu_field) = gnu_variant_list; - gnu_variant_list = gnu_field; - } - - /* Only make the QUAL_UNION_TYPE if there are any 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, false); - - /* 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_our_rep_list); - return; - } - - /* Deal with packedness like in gnat_to_gnu_field. */ - union_field_packed - = adjust_packed (gnu_union_type, gnu_record_type, packed); - - gnu_union_field - = create_field_decl (gnu_var_name, gnu_union_type, gnu_record_type, - union_field_packed, - all_rep ? TYPE_SIZE (gnu_union_type) : 0, - all_rep ? bitsize_zero_node : 0, 0); - - DECL_INTERNAL_P (gnu_union_field) = 1; - TREE_CHAIN (gnu_union_field) = gnu_field_list; - gnu_field_list = gnu_union_field; - } - } - - /* Scan GNU_FIELD_LIST and see if any fields have rep clauses. If they - do, pull them out and put them into GNU_OUR_REP_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. - - ??? Note: if we then reorder them, debugging information will be wrong, - but there's nothing that can be done about this at the moment. */ - for (gnu_field = gnu_field_list, gnu_last = NULL_TREE; gnu_field; ) - { - if (DECL_FIELD_OFFSET (gnu_field)) - { - tree gnu_next = TREE_CHAIN (gnu_field); - - if (!gnu_last) - gnu_field_list = gnu_next; - else - TREE_CHAIN (gnu_last) = gnu_next; - - TREE_CHAIN (gnu_field) = gnu_our_rep_list; - gnu_our_rep_list = gnu_field; - gnu_field = gnu_next; - } - else - { - gnu_last = gnu_field; - gnu_field = TREE_CHAIN (gnu_field); - } - } - - /* If we have any items in our rep'ed field list, it is not the case that all - the fields in the record have rep clauses, and P_REP_LIST is nonzero, - set it and ignore the items. */ - if (gnu_our_rep_list && p_gnu_rep_list && !all_rep) - *p_gnu_rep_list = chainon (*p_gnu_rep_list, gnu_our_rep_list); - else if (gnu_our_rep_list) - { - /* Otherwise, sort the fields by bit position and put them into their - own record if we have any fields without rep clauses. */ - tree gnu_rep_type - = (gnu_field_list ? make_node (RECORD_TYPE) : gnu_record_type); - int len = list_length (gnu_our_rep_list); - tree *gnu_arr = (tree *) alloca (sizeof (tree) * len); - int i; - - for (i = 0, gnu_field = gnu_our_rep_list; gnu_field; - gnu_field = TREE_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_our_rep_list = NULL_TREE; - for (i = len - 1; i >= 0; i--) - { - TREE_CHAIN (gnu_arr[i]) = gnu_our_rep_list; - gnu_our_rep_list = gnu_arr[i]; - DECL_CONTEXT (gnu_arr[i]) = gnu_rep_type; - } - - if (gnu_field_list) - { - finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, false); - gnu_field = create_field_decl (get_identifier ("REP"), gnu_rep_type, - gnu_record_type, 0, 0, 0, 1); - DECL_INTERNAL_P (gnu_field) = 1; - gnu_field_list = chainon (gnu_field_list, gnu_field); - } - else - { - layout_with_rep = true; - gnu_field_list = nreverse (gnu_our_rep_list); - } - } - - if (cancel_alignment) - TYPE_ALIGN (gnu_record_type) = 0; - - finish_record_type (gnu_record_type, nreverse (gnu_field_list), - layout_with_rep ? 1 : 0, do_not_finalize); -} - -/* 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) -{ - int len = TREE_CODE_LENGTH (TREE_CODE (gnu_size)); - TCode tcode; - Node_Ref_Or_Val ops[3], ret; - int i; - int size; - struct tree_int_map **h = NULL; - - /* See if we've already saved the value for this node. */ - if (EXPR_P (gnu_size)) - { - struct tree_int_map in; - 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; - h = (struct tree_int_map **) - htab_find_slot (annotate_value_cache, &in, INSERT); - - if (*h) - return (Node_Ref_Or_Val) (*h)->to; - } - - /* 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: - if (TREE_OVERFLOW (gnu_size)) - return No_Uint; - - /* This may have come from a conversion from some smaller type, - so ensure this is in bitsizetype. */ - gnu_size = convert (bitsizetype, gnu_size); - - /* For negative values, use NEGATE_EXPR of the supplied value. */ - if (tree_int_cst_sgn (gnu_size) < 0) - { - /* The ridiculous code below is to handle the case of the largest - negative integer. */ - tree negative_size = size_diffop (bitsize_zero_node, gnu_size); - bool adjust = false; - tree temp; - - if (TREE_OVERFLOW (negative_size)) - { - negative_size - = size_binop (MINUS_EXPR, bitsize_zero_node, - size_binop (PLUS_EXPR, gnu_size, - bitsize_one_node)); - adjust = true; - } - - temp = build1 (NEGATE_EXPR, bitsizetype, negative_size); - if (adjust) - temp = build2 (MINUS_EXPR, bitsizetype, temp, bitsize_one_node); - - return annotate_value (temp); - } - - if (!host_integerp (gnu_size, 1)) - return No_Uint; - - size = tree_low_cst (gnu_size, 1); - - /* This peculiar test is to make sure that the size fits in an int - on machines where HOST_WIDE_INT is not "int". */ - if (tree_low_cst (gnu_size, 1) == size) - return UI_From_Int (size); - else - return No_Uint; - - case COMPONENT_REF: - /* The only case we handle here is a simple discriminant reference. */ - if (TREE_CODE (TREE_OPERAND (gnu_size, 0)) == PLACEHOLDER_EXPR - && TREE_CODE (TREE_OPERAND (gnu_size, 1)) == FIELD_DECL - && DECL_DISCRIMINANT_NUMBER (TREE_OPERAND (gnu_size, 1))) - return Create_Node (Discrim_Val, - annotate_value (DECL_DISCRIMINANT_NUMBER - (TREE_OPERAND (gnu_size, 1))), - No_Uint, No_Uint); - else - 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 BIT_AND_EXPR: tcode = Bit_And_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; - - 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 < len; i++) - { - 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 (h) - { - *h = GGC_NEW (struct tree_int_map); - (*h)->base.from = gnu_size; - (*h)->to = ret; - } - - return ret; -} - -/* Given GNAT_ENTITY, a record type, and GNU_TYPE, its corresponding - GCC type, set Component_Bit_Offset and Esize to the position and size - used by Gigi. */ - -static void -annotate_rep (Entity_Id gnat_entity, tree gnu_type) -{ - tree gnu_list; - tree gnu_entry; - Entity_Id gnat_field; - - /* We operate by first making a list of all fields and their positions - (we can get the sizes easily at any time) by a recursive call - and then update all the sizes into the tree. */ - gnu_list = compute_field_positions (gnu_type, NULL_TREE, - size_zero_node, bitsize_zero_node, - BIGGEST_ALIGNMENT); - - 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 parent_offset = bitsize_zero_node; - - gnu_entry = purpose_member (gnat_to_gnu_field_decl (gnat_field), - gnu_list); - - if (gnu_entry) - { - if (type_annotate_only && Is_Tagged_Type (gnat_entity)) - { - /* In this mode the tag and parent components have not been - generated, so we add the appropriate offset to each - component. 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); - } - - Set_Component_Bit_Offset - (gnat_field, - annotate_value - (size_binop (PLUS_EXPR, - bit_from_pos (TREE_PURPOSE (TREE_VALUE (gnu_entry)), - TREE_VALUE (TREE_VALUE - (TREE_VALUE (gnu_entry)))), - parent_offset))); - - Set_Esize (gnat_field, - annotate_value (DECL_SIZE (TREE_PURPOSE (gnu_entry)))); - } - else if (Is_Tagged_Type (gnat_entity) - && Is_Derived_Type (gnat_entity)) - { - /* If there is no gnu_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 build entries where TREE_PURPOSE is the - FIELD_DECL and TREE_VALUE a TREE_LIST with TREE_PURPOSE being the byte - position and TREE_VALUE being a TREE_LIST with TREE_PURPOSE the value to be - placed into DECL_OFFSET_ALIGN and TREE_VALUE the bit position. GNU_POS is - to be added to the position, GNU_BITPOS to the bit position, OFFSET_ALIGN is - the present value of DECL_OFFSET_ALIGN and GNU_LIST is a list of the entries - so far. */ - -static tree -compute_field_positions (tree gnu_type, tree gnu_list, tree gnu_pos, - tree gnu_bitpos, unsigned int offset_align) -{ - tree gnu_field; - tree gnu_result = gnu_list; - - for (gnu_field = TYPE_FIELDS (gnu_type); gnu_field; - gnu_field = TREE_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)); - - gnu_result - = tree_cons (gnu_field, - tree_cons (gnu_our_offset, - tree_cons (size_int (our_offset_align), - gnu_our_bitpos, NULL_TREE), - NULL_TREE), - gnu_result); - - if (DECL_INTERNAL_P (gnu_field)) - gnu_result - = compute_field_positions (TREE_TYPE (gnu_field), gnu_result, - gnu_our_offset, gnu_our_bitpos, - our_offset_align); - } - - return gnu_result; -} - -/* UINT_SIZE is a Uint giving the specified size for an object of GNU_TYPE - corresponding to GNAT_OBJECT. If size is valid, return a tree corresponding - to its value. Otherwise return 0. KIND is VAR_DECL is we are specifying - the size for 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 for error - message handling and to indicate to use the object size of GNU_TYPE. - 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; - - 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); - - /* Find the node to use for errors. */ - 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; - - /* Return 0 if no size was specified, either because Esize was not Present or - the specified size was zero. */ - if (No (uint_size) || uint_size == No_Uint) - return NULL_TREE; - - /* Get the size as a tree. Give an error if a size was specified, but cannot - be represented as in sizetype. */ - size = UI_To_gnu (uint_size, bitsizetype); - if (TREE_OVERFLOW (size)) - { - post_error_ne (component_p ? "component size of & is too large" - : "size of & is too large", - gnat_error_node, gnat_object); - return NULL_TREE; - } - - /* Ignore a negative size since that corresponds to our back-annotation. - Also ignore a zero size unless a size clause exists. */ - else if (tree_int_cst_sgn (size) < 0 || (integer_zerop (size) && !zero_ok)) - 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 - verified the size, so we need not do it here (which would entail - 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); - - /* Modify the size of the type to be that of the maximum size if it has a - discriminant. */ - 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_FAT_POINTER_P (gnu_type)) - { - enum machine_mode p_mode; - - for (p_mode = GET_CLASS_NARROWEST_MODE (MODE_INT); - !targetm.valid_pointer_mode (p_mode); - p_mode = GET_MODE_WIDER_MODE (p_mode)) - ; - - type_size = bitsize_int (GET_MODE_BITSIZE (p_mode)); - } - - /* If the size of the object is a constant, the new size must not be - smaller. */ - 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); - - if (kind == VAR_DECL && !component_p - && TREE_CODE (rm_size (gnu_type)) == INTEGER_CST - && !tree_int_cst_lt (size, rm_size (gnu_type))) - post_error_ne_tree_2 - ("\\size of ^ is not a multiple of alignment (^ bits)", - gnat_error_node, gnat_object, rm_size (gnu_type), - TYPE_ALIGN (gnu_type)); - - else if (INTEGRAL_TYPE_P (gnu_type)) - post_error_ne ("\\size would be legal if & were not aliased!", - gnat_error_node, gnat_object); - - 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) -{ - /* Only give an error if a Value_Size clause was explicitly given. - Otherwise, we'd be duplicating an error on the Size clause. */ - Node_Id gnat_attr_node - = Get_Attribute_Definition_Clause (gnat_entity, Attr_Value_Size); - tree old_size = rm_size (gnu_type); - tree size; - - /* Get the size as a tree. Do nothing if none was specified, either - because RM_Size was not Present or if the specified size was zero. - Give an error if a size was specified, but cannot be represented as - in sizetype. */ - if (No (uint_size) || uint_size == No_Uint) - return; - - size = UI_To_gnu (uint_size, bitsizetype); - if (TREE_OVERFLOW (size)) - { - if (Present (gnat_attr_node)) - post_error_ne ("Value_Size of & is too large", gnat_attr_node, - gnat_entity); - - return; - } - - /* Ignore a negative size since that corresponds to our back-annotation. - Also ignore a zero size unless a size clause exists, a Value_Size - clause exists, or this is an integer type, in which case the - front end will have always set it. */ - else if (tree_int_cst_sgn (size) < 0 - || (integer_zerop (size) && No (gnat_attr_node) - && !Has_Size_Clause (gnat_entity) - && !Is_Discrete_Or_Fixed_Point_Type (gnat_entity))) - return; - - /* If the old size is self-referential, get the maximum size. */ - if (CONTAINS_PLACEHOLDER_P (old_size)) - old_size = max_size (old_size, true); - - /* If the size of the object is a constant, the new size must not be - smaller (the front end checks this for scalar types). */ - if (TREE_CODE (old_size) != INTEGER_CST - || TREE_OVERFLOW (old_size) - || (AGGREGATE_TYPE_P (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. */ - if (TREE_CODE (gnu_type) == INTEGER_TYPE - && Is_Discrete_Or_Fixed_Point_Type (gnat_entity)) - TYPE_RM_SIZE_NUM (gnu_type) = size; - else if (TREE_CODE (gnu_type) == ENUMERAL_TYPE - || TREE_CODE (gnu_type) == BOOLEAN_TYPE) - TYPE_RM_SIZE_NUM (gnu_type) = size; - else if ((TREE_CODE (gnu_type) == RECORD_TYPE - || TREE_CODE (gnu_type) == UNION_TYPE - || TREE_CODE (gnu_type) == QUAL_UNION_TYPE) - && !TYPE_IS_FAT_POINTER_P (gnu_type)) - SET_TYPE_ADA_SIZE (gnu_type, size); -} - -/* Given a type TYPE, return a new type whose size is appropriate for SIZE. - If TYPE is the best type, return it. Otherwise, make a new type. We - only support new integral and pointer types. FOR_BIASED is nonzero if - we are making a biased type. */ - -static tree -make_type_from_size (tree type, tree size_tree, bool for_biased) -{ - unsigned HOST_WIDE_INT size; - bool biased_p; - tree new_type; - - /* If size indicates an error, just return TYPE to avoid propagating - the error. Likewise if it's too large to represent. */ - if (!size_tree || !host_integerp (size_tree, 1)) - return type; - - size = tree_low_cst (size_tree, 1); - - switch (TREE_CODE (type)) - { - case INTEGER_TYPE: - case ENUMERAL_TYPE: - case BOOLEAN_TYPE: - biased_p = (TREE_CODE (type) == INTEGER_TYPE - && TYPE_BIASED_REPRESENTATION_P (type)); - - /* Only do something if the type is not a packed array type and - doesn't already have the proper size. */ - if (TYPE_PACKED_ARRAY_TYPE_P (type) - || (TYPE_PRECISION (type) == size && biased_p == for_biased)) - break; - - biased_p |= for_biased; - size = MIN (size, LONG_LONG_TYPE_SIZE); - - if (TYPE_UNSIGNED (type) || biased_p) - new_type = make_unsigned_type (size); - else - new_type = make_signed_type (size); - TREE_TYPE (new_type) = TREE_TYPE (type) ? TREE_TYPE (type) : type; - TYPE_MIN_VALUE (new_type) - = convert (TREE_TYPE (new_type), TYPE_MIN_VALUE (type)); - TYPE_MAX_VALUE (new_type) - = convert (TREE_TYPE (new_type), TYPE_MAX_VALUE (type)); - /* Propagate the name to avoid creating a fake subrange type. */ - if (TYPE_NAME (type)) - { - if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL) - TYPE_NAME (new_type) = DECL_NAME (TYPE_NAME (type)); - else - TYPE_NAME (new_type) = TYPE_NAME (type); - } - TYPE_BIASED_REPRESENTATION_P (new_type) = biased_p; - TYPE_RM_SIZE_NUM (new_type) = bitsize_int (size); - return new_type; - - case RECORD_TYPE: - /* Do something if this is a fat pointer, in which case we - may need to return the thin pointer. */ - if (TYPE_IS_FAT_POINTER_P (type) && size < POINTER_SIZE * 2) - { - enum machine_mode p_mode = mode_for_size (size, MODE_INT, 0); - if (!targetm.valid_pointer_mode (p_mode)) - p_mode = ptr_mode; - return - build_pointer_type_for_mode - (TYPE_OBJECT_RECORD_TYPE (TYPE_UNCONSTRAINED_ARRAY (type)), - p_mode, 0); - } - break; - - case POINTER_TYPE: - /* Only do something if this is a thin pointer, in which case we - may need to return the fat pointer. */ - if (TYPE_THIN_POINTER_P (type) && size >= POINTER_SIZE * 2) - return - build_pointer_type (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))); - break; - - default: - break; - } - - return type; -} - -/* 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. */ - if (Present (Alignment_Clause (gnat_entity))) - gnat_error_node = Expression (Alignment_Clause (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) - 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; -} - -/* Return the smallest alignment not less than SIZE. */ - -static unsigned int -ceil_alignment (unsigned HOST_WIDE_INT size) -{ - return (unsigned int) 1 << (floor_log2 (size - 1) + 1); -} - -/* 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)) - { - 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); -} - -/* Check if FTYPE1 and FTYPE2, two potentially different function type nodes, - have compatible signatures so that a call using one type may be safely - issued if the actual target function type is the other. Return 1 if it is - the case, 0 otherwise, and post errors on the incompatibilities. - - This is used when an Ada subprogram is mapped onto a GCC builtin, to ensure - that calls to the subprogram will have arguments suitable for the later - underlying builtin expansion. */ - -static int -compatible_signatures_p (tree ftype1, tree ftype2) -{ - /* As of now, we only perform very trivial tests and consider it's the - programmer's responsibility to ensure the type correctness in the Ada - declaration, as in the regular Import cases. - - Mismatches typically result in either error messages from the builtin - expander, internal compiler errors, or in a real call sequence. This - should be refined to issue diagnostics helping error detection and - correction. */ - - /* Almost fake test, ensuring a use of each argument. */ - if (ftype1 == ftype2) - return 1; - - return 1; -} - -/* Given a type T, a FIELD_DECL F, and a replacement value R, return a new - type with all size expressions that contain F updated by replacing F - with R. If F is NULL_TREE, always make a new RECORD_TYPE, even if - nothing has changed. */ - -tree -substitute_in_type (tree t, tree f, tree r) -{ - tree new = t; - tree tem; - - switch (TREE_CODE (t)) - { - case INTEGER_TYPE: - case ENUMERAL_TYPE: - case BOOLEAN_TYPE: - if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t)) - || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t))) - { - tree low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r); - tree high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r); - - if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t)) - return t; - - new = build_range_type (TREE_TYPE (t), low, high); - if (TYPE_INDEX_TYPE (t)) - SET_TYPE_INDEX_TYPE - (new, substitute_in_type (TYPE_INDEX_TYPE (t), f, r)); - return new; - } - - return t; - - case REAL_TYPE: - if (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (t)) - || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (t))) - { - tree low = NULL_TREE, high = NULL_TREE; - - if (TYPE_MIN_VALUE (t)) - low = SUBSTITUTE_IN_EXPR (TYPE_MIN_VALUE (t), f, r); - if (TYPE_MAX_VALUE (t)) - high = SUBSTITUTE_IN_EXPR (TYPE_MAX_VALUE (t), f, r); - - if (low == TYPE_MIN_VALUE (t) && high == TYPE_MAX_VALUE (t)) - return t; - - t = copy_type (t); - TYPE_MIN_VALUE (t) = low; - TYPE_MAX_VALUE (t) = high; - } - return t; - - case COMPLEX_TYPE: - tem = substitute_in_type (TREE_TYPE (t), f, r); - if (tem == TREE_TYPE (t)) - return t; - - return build_complex_type (tem); - - case OFFSET_TYPE: - case METHOD_TYPE: - case FUNCTION_TYPE: - case LANG_TYPE: - /* Don't know how to do these yet. */ - 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; - - new = build_array_type (component, domain); - TYPE_SIZE (new) = 0; - TYPE_NONALIASED_COMPONENT (new) = TYPE_NONALIASED_COMPONENT (t); - TYPE_MULTI_ARRAY_P (new) = TYPE_MULTI_ARRAY_P (t); - TYPE_CONVENTION_FORTRAN_P (new) = TYPE_CONVENTION_FORTRAN_P (t); - layout_type (new); - TYPE_ALIGN (new) = TYPE_ALIGN (t); - TYPE_USER_ALIGN (new) = TYPE_USER_ALIGN (t); - - /* If we had bounded the sizes of T by a constant, bound the sizes of - NEW by the same constant. */ - if (TREE_CODE (TYPE_SIZE (t)) == MIN_EXPR) - TYPE_SIZE (new) - = size_binop (MIN_EXPR, TREE_OPERAND (TYPE_SIZE (t), 1), - TYPE_SIZE (new)); - if (TREE_CODE (TYPE_SIZE_UNIT (t)) == MIN_EXPR) - TYPE_SIZE_UNIT (new) - = size_binop (MIN_EXPR, TREE_OPERAND (TYPE_SIZE_UNIT (t), 1), - TYPE_SIZE_UNIT (new)); - return new; - } - - case RECORD_TYPE: - case UNION_TYPE: - case QUAL_UNION_TYPE: - { - tree field; - bool changed_field - = (f == NULL_TREE && !TREE_CONSTANT (TYPE_SIZE (t))); - bool field_has_rep = false; - tree last_field = NULL_TREE; - - tree new = copy_type (t); - - /* 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. */ - - TYPE_FIELDS (new) = NULL_TREE; - TYPE_SIZE (new) = NULL_TREE; - - for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field)) - { - tree new_field = copy_node (field); - - TREE_TYPE (new_field) - = substitute_in_type (TREE_TYPE (new_field), f, r); - - if (DECL_HAS_REP_P (field) && !DECL_INTERNAL_P (field)) - field_has_rep = true; - else if (TREE_TYPE (new_field) != TREE_TYPE (field)) - changed_field = true; - - /* If this is an internal field and the type of this field is - a UNION_TYPE or RECORD_TYPE with no elements, ignore it. If - the type just has one element, treat that as the field. - But don't do this if we are processing a QUAL_UNION_TYPE. */ - if (TREE_CODE (t) != QUAL_UNION_TYPE - && DECL_INTERNAL_P (new_field) - && (TREE_CODE (TREE_TYPE (new_field)) == UNION_TYPE - || TREE_CODE (TREE_TYPE (new_field)) == RECORD_TYPE)) - { - if (!TYPE_FIELDS (TREE_TYPE (new_field))) - continue; - - if (!TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (new_field)))) - { - tree next_new_field - = copy_node (TYPE_FIELDS (TREE_TYPE (new_field))); - - /* Make sure omitting the union doesn't change - the layout. */ - DECL_ALIGN (next_new_field) = DECL_ALIGN (new_field); - new_field = next_new_field; - } - } - - DECL_CONTEXT (new_field) = new; - SET_DECL_ORIGINAL_FIELD (new_field, - (DECL_ORIGINAL_FIELD (field) - ? DECL_ORIGINAL_FIELD (field) : field)); - - /* If the size of the old field was set at a constant, - propagate the size in case the type's size was variable. - (This occurs in the case of a variant or discriminated - record with a default size used as a field of another - record.) */ - DECL_SIZE (new_field) - = TREE_CODE (DECL_SIZE (field)) == INTEGER_CST - ? DECL_SIZE (field) : NULL_TREE; - DECL_SIZE_UNIT (new_field) - = TREE_CODE (DECL_SIZE_UNIT (field)) == INTEGER_CST - ? DECL_SIZE_UNIT (field) : NULL_TREE; - - if (TREE_CODE (t) == QUAL_UNION_TYPE) - { - tree new_q = SUBSTITUTE_IN_EXPR (DECL_QUALIFIER (field), f, r); - - if (new_q != DECL_QUALIFIER (new_field)) - changed_field = true; - - /* Do the substitution inside the qualifier and if we find - that this field will not be present, omit it. */ - DECL_QUALIFIER (new_field) = new_q; - - if (integer_zerop (DECL_QUALIFIER (new_field))) - continue; - } - - if (!last_field) - TYPE_FIELDS (new) = new_field; - else - TREE_CHAIN (last_field) = new_field; - - last_field = new_field; - - /* If this is a qualified type and this field will always be - present, we are done. */ - if (TREE_CODE (t) == QUAL_UNION_TYPE - && integer_onep (DECL_QUALIFIER (new_field))) - break; - } - - /* If this used to be a qualified union type, but we now know what - field will be present, make this a normal union. */ - if (changed_field && TREE_CODE (new) == QUAL_UNION_TYPE - && (!TYPE_FIELDS (new) - || integer_onep (DECL_QUALIFIER (TYPE_FIELDS (new))))) - TREE_SET_CODE (new, UNION_TYPE); - else if (!changed_field) - return t; - - gcc_assert (!field_has_rep); - layout_type (new); - - /* If the size was originally a constant use it. */ - if (TYPE_SIZE (t) && TREE_CODE (TYPE_SIZE (t)) == INTEGER_CST - && TREE_CODE (TYPE_SIZE (new)) != INTEGER_CST) - { - TYPE_SIZE (new) = TYPE_SIZE (t); - TYPE_SIZE_UNIT (new) = TYPE_SIZE_UNIT (t); - SET_TYPE_ADA_SIZE (new, TYPE_ADA_SIZE (t)); - } - - return new; - } - - 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 integer types, this is the precision. For record types, we store - the size explicitly. For other types, this is just the size. */ - - if (INTEGRAL_TYPE_P (gnu_type) && TYPE_RM_SIZE (gnu_type)) - return TYPE_RM_SIZE (gnu_type); - else if (TREE_CODE (gnu_type) == RECORD_TYPE - && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) - /* Return the rm_size of the actual data plus the size of the template. */ - return - size_binop (PLUS_EXPR, - rm_size (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)))), - DECL_SIZE (TYPE_FIELDS (gnu_type))); - else if ((TREE_CODE (gnu_type) == RECORD_TYPE - || TREE_CODE (gnu_type) == UNION_TYPE - || TREE_CODE (gnu_type) == QUAL_UNION_TYPE) - && !TYPE_IS_FAT_POINTER_P (gnu_type) - && TYPE_ADA_SIZE (gnu_type)) - return TYPE_ADA_SIZE (gnu_type); - else - return TYPE_SIZE (gnu_type); -} - -/* 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); - - const char *str = (!suffix ? "" : suffix); - String_Template temp = {1, strlen (str)}; - Fat_Pointer fp = {str, &temp}; - - Get_External_Name_With_Suffix (gnat_entity, fp); - - /* A variable using the Stdcall convention (meaning we are running - on a Windows box) live in a DLL. Here 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 char *prefix = "_imp__"; - int k, plen = strlen (prefix); - - for (k = 0; k <= Name_Len; k++) - Name_Buffer [Name_Len - k + plen] = Name_Buffer [Name_Len - k]; - strncpy (Name_Buffer, prefix, plen); - } - - return get_identifier (Name_Buffer); -} - -/* 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 (Name_Buffer); -} - -/* Given GNU_ID, an IDENTIFIER_NODE containing a name and SUFFIX, a - string, return a new IDENTIFIER_NODE that is the concatenation of - the name in GNU_ID and SUFFIX. */ - -tree -concat_id_with_name (tree gnu_id, const char *suffix) -{ - int len = IDENTIFIER_LENGTH (gnu_id); - - strncpy (Name_Buffer, IDENTIFIER_POINTER (gnu_id), len); - strncpy (Name_Buffer + len, "___", 3); - len += 3; - strcpy (Name_Buffer + len, suffix); - return get_identifier (Name_Buffer); -} - -#include "gt-ada-decl.h" |