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| author | Dan Albert <danalbert@google.com> | 2015-06-17 11:09:54 -0700 |
|---|---|---|
| committer | Dan Albert <danalbert@google.com> | 2015-06-17 14:15:22 -0700 |
| commit | f378ebf14df0952eae870c9865bab8326aa8f137 (patch) | |
| tree | 31794503eb2a8c64ea5f313b93100f1163afcffb /gcc-4.4.3/gcc/ada/gcc-interface/trans.c | |
| parent | 2c58169824949d3a597d9fa81931e001ef9b1bd0 (diff) | |
| download | toolchain_gcc-f378ebf14df0952eae870c9865bab8326aa8f137.tar.gz toolchain_gcc-f378ebf14df0952eae870c9865bab8326aa8f137.tar.bz2 toolchain_gcc-f378ebf14df0952eae870c9865bab8326aa8f137.zip | |
Delete old versions of GCC.
Change-Id: I710f125d905290e1024cbd67f48299861790c66c
Diffstat (limited to 'gcc-4.4.3/gcc/ada/gcc-interface/trans.c')
| -rw-r--r-- | gcc-4.4.3/gcc/ada/gcc-interface/trans.c | 7410 |
1 files changed, 0 insertions, 7410 deletions
diff --git a/gcc-4.4.3/gcc/ada/gcc-interface/trans.c b/gcc-4.4.3/gcc/ada/gcc-interface/trans.c deleted file mode 100644 index d028c7243..000000000 --- a/gcc-4.4.3/gcc/ada/gcc-interface/trans.c +++ /dev/null @@ -1,7410 +0,0 @@ -/**************************************************************************** - * * - * GNAT COMPILER COMPONENTS * - * * - * T R A N S * - * * - * 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 distributed with GNAT; see 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 "real.h" -#include "flags.h" -#include "toplev.h" -#include "rtl.h" -#include "expr.h" -#include "ggc.h" -#include "cgraph.h" -#include "function.h" -#include "except.h" -#include "debug.h" -#include "output.h" -#include "tree-iterator.h" -#include "gimple.h" -#include "ada.h" -#include "types.h" -#include "atree.h" -#include "elists.h" -#include "namet.h" -#include "nlists.h" -#include "snames.h" -#include "stringt.h" -#include "uintp.h" -#include "urealp.h" -#include "fe.h" -#include "sinfo.h" -#include "einfo.h" -#include "ada-tree.h" -#include "gigi.h" -#include "adadecode.h" - -#include "dwarf2.h" -#include "dwarf2out.h" - -/* We should avoid allocating more than ALLOCA_THRESHOLD bytes via alloca, - for fear of running out of stack space. If we need more, we use xmalloc - instead. */ -#define ALLOCA_THRESHOLD 1000 - -/* Let code below know whether we are targetting VMS without need of - intrusive preprocessor directives. */ -#ifndef TARGET_ABI_OPEN_VMS -#define TARGET_ABI_OPEN_VMS 0 -#endif - -/* For efficient float-to-int rounding, it is necessary to know whether - floating-point arithmetic may use wider intermediate results. - When FP_ARITH_MAY_WIDEN is not defined, be conservative and only assume - floating-point arithmetic does not widen if double precision is emulated. */ - -#ifndef FP_ARITH_MAY_WIDEN -#if defined(HAVE_extendsfdf2) -#define FP_ARITH_MAY_WIDEN HAVE_extendsfdf2 -#else -#define FP_ARITH_MAY_WIDEN 0 -#endif -#endif - -extern char *__gnat_to_canonical_file_spec (char *); - -int max_gnat_nodes; -int number_names; -int number_files; -struct Node *Nodes_Ptr; -Node_Id *Next_Node_Ptr; -Node_Id *Prev_Node_Ptr; -struct Elist_Header *Elists_Ptr; -struct Elmt_Item *Elmts_Ptr; -struct String_Entry *Strings_Ptr; -Char_Code *String_Chars_Ptr; -struct List_Header *List_Headers_Ptr; - -/* Current filename without path. */ -const char *ref_filename; - -/* If true, then gigi is being called on an analyzed but unexpanded - tree, and the only purpose of the call is to properly annotate - types with representation information. */ -bool type_annotate_only; - -/* When not optimizing, we cache the 'First, 'Last and 'Length attributes - of unconstrained array IN parameters to avoid emitting a great deal of - redundant instructions to recompute them each time. */ -struct parm_attr GTY (()) -{ - int id; /* GTY doesn't like Entity_Id. */ - int dim; - tree first; - tree last; - tree length; -}; - -typedef struct parm_attr *parm_attr; - -DEF_VEC_P(parm_attr); -DEF_VEC_ALLOC_P(parm_attr,gc); - -struct language_function GTY(()) -{ - VEC(parm_attr,gc) *parm_attr_cache; -}; - -#define f_parm_attr_cache \ - DECL_STRUCT_FUNCTION (current_function_decl)->language->parm_attr_cache - -/* A structure used to gather together information about a statement group. - We use this to gather related statements, for example the "then" part - of a IF. In the case where it represents a lexical scope, we may also - have a BLOCK node corresponding to it and/or cleanups. */ - -struct stmt_group GTY((chain_next ("%h.previous"))) { - struct stmt_group *previous; /* Previous code group. */ - tree stmt_list; /* List of statements for this code group. */ - tree block; /* BLOCK for this code group, if any. */ - tree cleanups; /* Cleanups for this code group, if any. */ -}; - -static GTY(()) struct stmt_group *current_stmt_group; - -/* List of unused struct stmt_group nodes. */ -static GTY((deletable)) struct stmt_group *stmt_group_free_list; - -/* A structure used to record information on elaboration procedures - we've made and need to process. - - ??? gnat_node should be Node_Id, but gengtype gets confused. */ - -struct elab_info GTY((chain_next ("%h.next"))) { - struct elab_info *next; /* Pointer to next in chain. */ - tree elab_proc; /* Elaboration procedure. */ - int gnat_node; /* The N_Compilation_Unit. */ -}; - -static GTY(()) struct elab_info *elab_info_list; - -/* Free list of TREE_LIST nodes used for stacks. */ -static GTY((deletable)) tree gnu_stack_free_list; - -/* List of TREE_LIST nodes representing a stack of exception pointer - variables. TREE_VALUE is the VAR_DECL that stores the address of - the raised exception. Nonzero means we are in an exception - handler. Not used in the zero-cost case. */ -static GTY(()) tree gnu_except_ptr_stack; - -/* List of TREE_LIST nodes used to store the current elaboration procedure - decl. TREE_VALUE is the decl. */ -static GTY(()) tree gnu_elab_proc_stack; - -/* Variable that stores a list of labels to be used as a goto target instead of - a return in some functions. See processing for N_Subprogram_Body. */ -static GTY(()) tree gnu_return_label_stack; - -/* List of TREE_LIST nodes representing a stack of LOOP_STMT nodes. - TREE_VALUE of each entry is the label of the corresponding LOOP_STMT. */ -static GTY(()) tree gnu_loop_label_stack; - -/* List of TREE_LIST nodes representing labels for switch statements. - TREE_VALUE of each entry is the label at the end of the switch. */ -static GTY(()) tree gnu_switch_label_stack; - -/* List of TREE_LIST nodes containing the stacks for N_{Push,Pop}_*_Label. */ -static GTY(()) tree gnu_constraint_error_label_stack; -static GTY(()) tree gnu_storage_error_label_stack; -static GTY(()) tree gnu_program_error_label_stack; - -/* Map GNAT tree codes to GCC tree codes for simple expressions. */ -static enum tree_code gnu_codes[Number_Node_Kinds]; - -/* Current node being treated, in case abort called. */ -Node_Id error_gnat_node; - -static void init_code_table (void); -static void Compilation_Unit_to_gnu (Node_Id); -static void record_code_position (Node_Id); -static void insert_code_for (Node_Id); -static void add_cleanup (tree, Node_Id); -static tree unshare_save_expr (tree *, int *, void *); -static void add_stmt_list (List_Id); -static void push_exception_label_stack (tree *, Entity_Id); -static tree build_stmt_group (List_Id, bool); -static void push_stack (tree *, tree, tree); -static void pop_stack (tree *); -static enum gimplify_status gnat_gimplify_stmt (tree *); -static void elaborate_all_entities (Node_Id); -static void process_freeze_entity (Node_Id); -static void process_inlined_subprograms (Node_Id); -static void process_decls (List_Id, List_Id, Node_Id, bool, bool); -static tree emit_range_check (tree, Node_Id); -static tree emit_index_check (tree, tree, tree, tree); -static tree emit_check (tree, tree, int); -static tree build_unary_op_trapv (enum tree_code, tree, tree); -static tree build_binary_op_trapv (enum tree_code, tree, tree, tree); -static tree convert_with_check (Entity_Id, tree, bool, bool, bool); -static bool smaller_packable_type_p (tree, tree); -static bool addressable_p (tree, tree); -static tree assoc_to_constructor (Entity_Id, Node_Id, tree); -static tree extract_values (tree, tree); -static tree pos_to_constructor (Node_Id, tree, Entity_Id); -static tree maybe_implicit_deref (tree); -static tree gnat_stabilize_reference (tree, bool); -static tree gnat_stabilize_reference_1 (tree, bool); -static void set_expr_location_from_node (tree, Node_Id); -static int lvalue_required_p (Node_Id, tree, int); - -/* Hooks for debug info back-ends, only supported and used in a restricted set - of configurations. */ -static const char *extract_encoding (const char *) ATTRIBUTE_UNUSED; -static const char *decode_name (const char *) ATTRIBUTE_UNUSED; - -/* This is the main program of the back-end. It sets up all the table - structures and then generates code. */ - -void -gigi (Node_Id gnat_root, int max_gnat_node, int number_name, - struct Node *nodes_ptr, Node_Id *next_node_ptr, Node_Id *prev_node_ptr, - struct Elist_Header *elists_ptr, struct Elmt_Item *elmts_ptr, - struct String_Entry *strings_ptr, Char_Code *string_chars_ptr, - struct List_Header *list_headers_ptr, Nat number_file, - struct File_Info_Type *file_info_ptr, Entity_Id standard_boolean, - Entity_Id standard_integer, Entity_Id standard_long_long_float, - Entity_Id standard_exception_type, Int gigi_operating_mode) -{ - Entity_Id gnat_literal; - tree gnu_standard_long_long_float, gnu_standard_exception_type, t; - struct elab_info *info; - int i; - - max_gnat_nodes = max_gnat_node; - number_names = number_name; - number_files = number_file; - Nodes_Ptr = nodes_ptr; - Next_Node_Ptr = next_node_ptr; - Prev_Node_Ptr = prev_node_ptr; - Elists_Ptr = elists_ptr; - Elmts_Ptr = elmts_ptr; - Strings_Ptr = strings_ptr; - String_Chars_Ptr = string_chars_ptr; - List_Headers_Ptr = list_headers_ptr; - - type_annotate_only = (gigi_operating_mode == 1); - - for (i = 0; i < number_files; i++) - { - /* Use the identifier table to make a permanent copy of the filename as - the name table gets reallocated after Gigi returns but before all the - debugging information is output. The __gnat_to_canonical_file_spec - call translates filenames from pragmas Source_Reference that contain - host style syntax not understood by gdb. */ - const char *filename - = IDENTIFIER_POINTER - (get_identifier - (__gnat_to_canonical_file_spec - (Get_Name_String (file_info_ptr[i].File_Name)))); - - /* We rely on the order isomorphism between files and line maps. */ - gcc_assert ((int) line_table->used == i); - - /* We create the line map for a source file at once, with a fixed number - of columns chosen to avoid jumping over the next power of 2. */ - linemap_add (line_table, LC_ENTER, 0, filename, 1); - linemap_line_start (line_table, file_info_ptr[i].Num_Source_Lines, 252); - linemap_position_for_column (line_table, 252 - 1); - linemap_add (line_table, LC_LEAVE, 0, NULL, 0); - } - - /* Initialize ourselves. */ - init_code_table (); - init_gnat_to_gnu (); - gnat_compute_largest_alignment (); - init_dummy_type (); - - /* If we are just annotating types, give VOID_TYPE zero sizes to avoid - errors. */ - if (type_annotate_only) - { - TYPE_SIZE (void_type_node) = bitsize_zero_node; - TYPE_SIZE_UNIT (void_type_node) = size_zero_node; - } - - /* If the GNU type extensions to DWARF are available, setup the hooks. */ -#if defined (DWARF2_DEBUGGING_INFO) && defined (DWARF2_GNU_TYPE_EXTENSIONS) - /* We condition the name demangling and the generation of type encoding - strings on -gdwarf+ and always set descriptive types on. */ - if (use_gnu_debug_info_extensions) - { - dwarf2out_set_type_encoding_func (extract_encoding); - dwarf2out_set_demangle_name_func (decode_name); - } - dwarf2out_set_descriptive_type_func (get_parallel_type); -#endif - - /* Enable GNAT stack checking method if needed */ - if (!Stack_Check_Probes_On_Target) - set_stack_check_libfunc (gen_rtx_SYMBOL_REF (Pmode, "_gnat_stack_check")); - - /* Give names and make TYPE_DECLs for common types. */ - create_type_decl (get_identifier (SIZE_TYPE), sizetype, - NULL, false, true, Empty); - create_type_decl (get_identifier ("boolean"), boolean_type_node, - NULL, false, true, Empty); - create_type_decl (get_identifier ("integer"), integer_type_node, - NULL, false, true, Empty); - create_type_decl (get_identifier ("unsigned char"), char_type_node, - NULL, false, true, Empty); - create_type_decl (get_identifier ("long integer"), long_integer_type_node, - NULL, false, true, Empty); - - /* Save the type we made for boolean as the type for Standard.Boolean. */ - save_gnu_tree (Base_Type (standard_boolean), TYPE_NAME (boolean_type_node), - false); - gnat_literal = First_Literal (Base_Type (standard_boolean)); - t = UI_To_gnu (Enumeration_Rep (gnat_literal), boolean_type_node); - gcc_assert (t == boolean_false_node); - t = create_var_decl (get_entity_name (gnat_literal), NULL_TREE, - boolean_type_node, t, true, false, false, false, - NULL, gnat_literal); - DECL_IGNORED_P (t) = 1; - save_gnu_tree (gnat_literal, t, false); - gnat_literal = Next_Literal (gnat_literal); - t = UI_To_gnu (Enumeration_Rep (gnat_literal), boolean_type_node); - gcc_assert (t == boolean_true_node); - t = create_var_decl (get_entity_name (gnat_literal), NULL_TREE, - boolean_type_node, t, true, false, false, false, - NULL, gnat_literal); - DECL_IGNORED_P (t) = 1; - save_gnu_tree (gnat_literal, t, false); - - /* Save the type we made for integer as the type for Standard.Integer. - Then make the rest of the standard types. Note that some of these - may be subtypes. */ - save_gnu_tree (Base_Type (standard_integer), TYPE_NAME (integer_type_node), - false); - - gnu_except_ptr_stack = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE); - gnu_constraint_error_label_stack - = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE); - gnu_storage_error_label_stack = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE); - gnu_program_error_label_stack = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE); - - gnu_standard_long_long_float - = gnat_to_gnu_entity (Base_Type (standard_long_long_float), NULL_TREE, 0); - gnu_standard_exception_type - = gnat_to_gnu_entity (Base_Type (standard_exception_type), NULL_TREE, 0); - - init_gigi_decls (gnu_standard_long_long_float, gnu_standard_exception_type); - - /* Process any Pragma Ident for the main unit. */ -#ifdef ASM_OUTPUT_IDENT - if (Present (Ident_String (Main_Unit))) - ASM_OUTPUT_IDENT - (asm_out_file, - TREE_STRING_POINTER (gnat_to_gnu (Ident_String (Main_Unit)))); -#endif - - /* If we are using the GCC exception mechanism, let GCC know. */ - if (Exception_Mechanism == Back_End_Exceptions) - gnat_init_gcc_eh (); - - gcc_assert (Nkind (gnat_root) == N_Compilation_Unit); - - /* Declare the name of the compilation unit as the first global - name in order to make the middle-end fully deterministic. */ - t = create_concat_name (Defining_Entity (Unit (gnat_root)), NULL); - first_global_object_name = ggc_strdup (IDENTIFIER_POINTER (t)); - - /* Now translate the compilation unit proper. */ - start_stmt_group (); - Compilation_Unit_to_gnu (gnat_root); - - /* Finally see if we have any elaboration procedures to deal with. */ - for (info = elab_info_list; info; info = info->next) - { - tree gnu_body = DECL_SAVED_TREE (info->elab_proc); - - /* Unshare SAVE_EXPRs between subprograms. These are not unshared by - the gimplifier for obvious reasons, but it turns out that we need to - unshare them for the global level because of SAVE_EXPRs made around - checks for global objects and around allocators for global objects - of variable size, in order to prevent node sharing in the underlying - expression. Note that this implicitly assumes that the SAVE_EXPR - nodes themselves are not shared between subprograms, which would be - an upstream bug for which we would not change the outcome. */ - walk_tree_without_duplicates (&gnu_body, unshare_save_expr, NULL); - - /* Process the function as others, but for indicating this is an - elab proc, to be discarded if empty, then propagate the status - up to the GNAT tree node. */ - begin_subprog_body (info->elab_proc); - end_subprog_body (gnu_body, true); - - if (empty_body_p (gimple_body (info->elab_proc))) - Set_Has_No_Elaboration_Code (info->gnat_node, 1); - } - - /* We cannot track the location of errors past this point. */ - error_gnat_node = Empty; -} - -/* Return a positive value if an lvalue is required for GNAT_NODE. - GNU_TYPE is the type that will be used for GNAT_NODE in the - translated GNU tree. ALIASED indicates whether the underlying - object represented by GNAT_NODE is aliased in the Ada sense. - - The function climbs up the GNAT tree starting from the node and - returns 1 upon encountering a node that effectively requires an - lvalue downstream. It returns int instead of bool to facilitate - usage in non purely binary logic contexts. */ - -static int -lvalue_required_p (Node_Id gnat_node, tree gnu_type, int aliased) -{ - Node_Id gnat_parent = Parent (gnat_node), gnat_temp; - - switch (Nkind (gnat_parent)) - { - case N_Reference: - return 1; - - case N_Attribute_Reference: - { - unsigned char id = Get_Attribute_Id (Attribute_Name (gnat_parent)); - return id == Attr_Address - || id == Attr_Access - || id == Attr_Unchecked_Access - || id == Attr_Unrestricted_Access; - } - - case N_Parameter_Association: - case N_Function_Call: - case N_Procedure_Call_Statement: - return (must_pass_by_ref (gnu_type) || default_pass_by_ref (gnu_type)); - - case N_Indexed_Component: - /* Only the array expression can require an lvalue. */ - if (Prefix (gnat_parent) != gnat_node) - return 0; - - /* ??? Consider that referencing an indexed component with a - non-constant index forces the whole aggregate to memory. - Note that N_Integer_Literal is conservative, any static - expression in the RM sense could probably be accepted. */ - for (gnat_temp = First (Expressions (gnat_parent)); - Present (gnat_temp); - gnat_temp = Next (gnat_temp)) - if (Nkind (gnat_temp) != N_Integer_Literal) - return 1; - - /* ... fall through ... */ - - case N_Slice: - /* Only the array expression can require an lvalue. */ - if (Prefix (gnat_parent) != gnat_node) - return 0; - - aliased |= Has_Aliased_Components (Etype (gnat_node)); - return lvalue_required_p (gnat_parent, gnu_type, aliased); - - case N_Selected_Component: - aliased |= Is_Aliased (Entity (Selector_Name (gnat_parent))); - return lvalue_required_p (gnat_parent, gnu_type, aliased); - - case N_Object_Renaming_Declaration: - /* We need to make a real renaming only if the constant object is - aliased or if we may use a renaming pointer; otherwise we can - optimize and return the rvalue. We make an exception if the object - is an identifier since in this case the rvalue can be propagated - attached to the CONST_DECL. */ - return (aliased != 0 - /* This should match the constant case of the renaming code. */ - || Is_Composite_Type (Etype (Name (gnat_parent))) - || Nkind (Name (gnat_parent)) == N_Identifier); - - default: - return 0; - } - - gcc_unreachable (); -} - -/* Subroutine of gnat_to_gnu to translate gnat_node, an N_Identifier, - to a GCC tree, which is returned. GNU_RESULT_TYPE_P is a pointer - to where we should place the result type. */ - -static tree -Identifier_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p) -{ - Node_Id gnat_temp, gnat_temp_type; - tree gnu_result, gnu_result_type; - - /* Whether we should require an lvalue for GNAT_NODE. Needed in - specific circumstances only, so evaluated lazily. < 0 means - unknown, > 0 means known true, 0 means known false. */ - int require_lvalue = -1; - - /* If GNAT_NODE is a constant, whether we should use the initialization - value instead of the constant entity, typically for scalars with an - address clause when the parent doesn't require an lvalue. */ - bool use_constant_initializer = false; - - /* If the Etype of this node does not equal the Etype of the Entity, - something is wrong with the entity map, probably in generic - instantiation. However, this does not apply to types. Since we sometime - have strange Ekind's, just do this test for objects. Also, if the Etype of - the Entity is private, the Etype of the N_Identifier is allowed to be the - full type and also we consider a packed array type to be the same as the - original type. Similarly, a class-wide type is equivalent to a subtype of - itself. Finally, if the types are Itypes, one may be a copy of the other, - which is also legal. */ - gnat_temp = (Nkind (gnat_node) == N_Defining_Identifier - ? gnat_node : Entity (gnat_node)); - gnat_temp_type = Etype (gnat_temp); - - gcc_assert (Etype (gnat_node) == gnat_temp_type - || (Is_Packed (gnat_temp_type) - && Etype (gnat_node) == Packed_Array_Type (gnat_temp_type)) - || (Is_Class_Wide_Type (Etype (gnat_node))) - || (IN (Ekind (gnat_temp_type), Private_Kind) - && Present (Full_View (gnat_temp_type)) - && ((Etype (gnat_node) == Full_View (gnat_temp_type)) - || (Is_Packed (Full_View (gnat_temp_type)) - && (Etype (gnat_node) - == Packed_Array_Type (Full_View - (gnat_temp_type)))))) - || (Is_Itype (Etype (gnat_node)) && Is_Itype (gnat_temp_type)) - || !(Ekind (gnat_temp) == E_Variable - || Ekind (gnat_temp) == E_Component - || Ekind (gnat_temp) == E_Constant - || Ekind (gnat_temp) == E_Loop_Parameter - || IN (Ekind (gnat_temp), Formal_Kind))); - - /* If this is a reference to a deferred constant whose partial view is an - unconstrained private type, the proper type is on the full view of the - constant, not on the full view of the type, which may be unconstrained. - - This may be a reference to a type, for example in the prefix of the - attribute Position, generated for dispatching code (see Make_DT in - exp_disp,adb). In that case we need the type itself, not is parent, - in particular if it is a derived type */ - if (Is_Private_Type (gnat_temp_type) - && Has_Unknown_Discriminants (gnat_temp_type) - && Ekind (gnat_temp) == E_Constant - && Present (Full_View (gnat_temp))) - { - gnat_temp = Full_View (gnat_temp); - gnat_temp_type = Etype (gnat_temp); - } - else - { - /* We want to use the Actual_Subtype if it has already been elaborated, - otherwise the Etype. Avoid using Actual_Subtype for packed arrays to - simplify things. */ - if ((Ekind (gnat_temp) == E_Constant - || Ekind (gnat_temp) == E_Variable || Is_Formal (gnat_temp)) - && !(Is_Array_Type (Etype (gnat_temp)) - && Present (Packed_Array_Type (Etype (gnat_temp)))) - && Present (Actual_Subtype (gnat_temp)) - && present_gnu_tree (Actual_Subtype (gnat_temp))) - gnat_temp_type = Actual_Subtype (gnat_temp); - else - gnat_temp_type = Etype (gnat_node); - } - - /* Expand the type of this identifier first, in case it is an enumeral - literal, which only get made when the type is expanded. There is no - order-of-elaboration issue here. */ - gnu_result_type = get_unpadded_type (gnat_temp_type); - - /* If this is a non-imported scalar constant with an address clause, - retrieve the value instead of a pointer to be dereferenced unless - an lvalue is required. This is generally more efficient and actually - required if this is a static expression because it might be used - in a context where a dereference is inappropriate, such as a case - statement alternative or a record discriminant. There is no possible - volatile-ness short-circuit here since Volatile constants must be imported - per C.6. */ - if (Ekind (gnat_temp) == E_Constant && Is_Scalar_Type (gnat_temp_type) - && !Is_Imported (gnat_temp) - && Present (Address_Clause (gnat_temp))) - { - require_lvalue = lvalue_required_p (gnat_node, gnu_result_type, - Is_Aliased (gnat_temp)); - use_constant_initializer = !require_lvalue; - } - - if (use_constant_initializer) - { - /* If this is a deferred constant, the initializer is attached to - the full view. */ - if (Present (Full_View (gnat_temp))) - gnat_temp = Full_View (gnat_temp); - - gnu_result = gnat_to_gnu (Expression (Declaration_Node (gnat_temp))); - } - else - gnu_result = gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0); - - /* If we are in an exception handler, force this variable into memory to - ensure optimization does not remove stores that appear redundant but are - actually needed in case an exception occurs. - - ??? Note that we need not do this if the variable is declared within the - handler, only if it is referenced in the handler and declared in an - enclosing block, but we have no way of testing that right now. - - ??? We used to essentially set the TREE_ADDRESSABLE flag on the variable - here, but it can now be removed by the Tree aliasing machinery if the - address of the variable is never taken. All we can do is to make the - variable volatile, which might incur the generation of temporaries just - to access the memory in some circumstances. This can be avoided for - variables of non-constant size because they are automatically allocated - to memory. There might be no way of allocating a proper temporary for - them in any case. We only do this for SJLJ though. */ - if (TREE_VALUE (gnu_except_ptr_stack) - && TREE_CODE (gnu_result) == VAR_DECL - && TREE_CODE (DECL_SIZE_UNIT (gnu_result)) == INTEGER_CST) - TREE_THIS_VOLATILE (gnu_result) = TREE_SIDE_EFFECTS (gnu_result) = 1; - - /* Some objects (such as parameters passed by reference, globals of - variable size, and renamed objects) actually represent the address - of the object. In that case, we must do the dereference. Likewise, - deal with parameters to foreign convention subprograms. */ - if (DECL_P (gnu_result) - && (DECL_BY_REF_P (gnu_result) - || (TREE_CODE (gnu_result) == PARM_DECL - && DECL_BY_COMPONENT_PTR_P (gnu_result)))) - { - bool ro = DECL_POINTS_TO_READONLY_P (gnu_result); - tree renamed_obj; - - if (TREE_CODE (gnu_result) == PARM_DECL - && DECL_BY_COMPONENT_PTR_P (gnu_result)) - gnu_result - = build_unary_op (INDIRECT_REF, NULL_TREE, - convert (build_pointer_type (gnu_result_type), - gnu_result)); - - /* If it's a renaming pointer and we are at the right binding level, - we can reference the renamed object directly, since the renamed - expression has been protected against multiple evaluations. */ - else if (TREE_CODE (gnu_result) == VAR_DECL - && (renamed_obj = DECL_RENAMED_OBJECT (gnu_result)) != 0 - && (! DECL_RENAMING_GLOBAL_P (gnu_result) - || global_bindings_p ())) - gnu_result = renamed_obj; - - /* Return the underlying CST for a CONST_DECL like a few lines below, - after dereferencing in this case. */ - else if (TREE_CODE (gnu_result) == CONST_DECL) - gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, - DECL_INITIAL (gnu_result)); - - else - gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result); - - TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result) = ro; - } - - /* The GNAT tree has the type of a function as the type of its result. Also - use the type of the result if the Etype is a subtype which is nominally - unconstrained. But remove any padding from the resulting type. */ - if (TREE_CODE (TREE_TYPE (gnu_result)) == FUNCTION_TYPE - || Is_Constr_Subt_For_UN_Aliased (gnat_temp_type)) - { - gnu_result_type = TREE_TYPE (gnu_result); - if (TREE_CODE (gnu_result_type) == RECORD_TYPE - && TYPE_IS_PADDING_P (gnu_result_type)) - gnu_result_type = TREE_TYPE (TYPE_FIELDS (gnu_result_type)); - } - - /* If we have a constant declaration and its initializer at hand, - try to return the latter to avoid the need to call fold in lots - of places and the need of elaboration code if this Id is used as - an initializer itself. */ - if (TREE_CONSTANT (gnu_result) - && DECL_P (gnu_result) - && DECL_INITIAL (gnu_result)) - { - tree object - = (TREE_CODE (gnu_result) == CONST_DECL - ? DECL_CONST_CORRESPONDING_VAR (gnu_result) : gnu_result); - - /* If there is a corresponding variable, we only want to return - the CST value if an lvalue is not required. Evaluate this - now if we have not already done so. */ - if (object && require_lvalue < 0) - require_lvalue = lvalue_required_p (gnat_node, gnu_result_type, - Is_Aliased (gnat_temp)); - - if (!object || !require_lvalue) - gnu_result = unshare_expr (DECL_INITIAL (gnu_result)); - } - - *gnu_result_type_p = gnu_result_type; - return gnu_result; -} - -/* Subroutine of gnat_to_gnu to process gnat_node, an N_Pragma. Return - any statements we generate. */ - -static tree -Pragma_to_gnu (Node_Id gnat_node) -{ - Node_Id gnat_temp; - tree gnu_result = alloc_stmt_list (); - - /* Check for (and ignore) unrecognized pragma and do nothing if we are just - annotating types. */ - if (type_annotate_only - || !Is_Pragma_Name (Chars (Pragma_Identifier (gnat_node)))) - return gnu_result; - - switch (Get_Pragma_Id (Chars (Pragma_Identifier (gnat_node)))) - { - case Pragma_Inspection_Point: - /* Do nothing at top level: all such variables are already viewable. */ - if (global_bindings_p ()) - break; - - for (gnat_temp = First (Pragma_Argument_Associations (gnat_node)); - Present (gnat_temp); - gnat_temp = Next (gnat_temp)) - { - Node_Id gnat_expr = Expression (gnat_temp); - tree gnu_expr = gnat_to_gnu (gnat_expr); - int use_address; - enum machine_mode mode; - tree asm_constraint = NULL_TREE; -#ifdef ASM_COMMENT_START - char *comment; -#endif - - if (TREE_CODE (gnu_expr) == UNCONSTRAINED_ARRAY_REF) - gnu_expr = TREE_OPERAND (gnu_expr, 0); - - /* Use the value only if it fits into a normal register, - otherwise use the address. */ - mode = TYPE_MODE (TREE_TYPE (gnu_expr)); - use_address = ((GET_MODE_CLASS (mode) != MODE_INT - && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT) - || GET_MODE_SIZE (mode) > UNITS_PER_WORD); - - if (use_address) - gnu_expr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr); - -#ifdef ASM_COMMENT_START - comment = concat (ASM_COMMENT_START, - " inspection point: ", - Get_Name_String (Chars (gnat_expr)), - use_address ? " address" : "", - " is in %0", - NULL); - asm_constraint = build_string (strlen (comment), comment); - free (comment); -#endif - gnu_expr = build4 (ASM_EXPR, void_type_node, - asm_constraint, - NULL_TREE, - tree_cons - (build_tree_list (NULL_TREE, - build_string (1, "g")), - gnu_expr, NULL_TREE), - NULL_TREE); - ASM_VOLATILE_P (gnu_expr) = 1; - set_expr_location_from_node (gnu_expr, gnat_node); - append_to_statement_list (gnu_expr, &gnu_result); - } - break; - - case Pragma_Optimize: - switch (Chars (Expression - (First (Pragma_Argument_Associations (gnat_node))))) - { - case Name_Time: case Name_Space: - if (!optimize) - post_error ("insufficient -O value?", gnat_node); - break; - - case Name_Off: - if (optimize) - post_error ("must specify -O0?", gnat_node); - break; - - default: - gcc_unreachable (); - } - break; - - case Pragma_Reviewable: - if (write_symbols == NO_DEBUG) - post_error ("must specify -g?", gnat_node); - break; - } - - return gnu_result; -} -/* Subroutine of gnat_to_gnu to translate gnat_node, an N_Attribute, - to a GCC tree, which is returned. GNU_RESULT_TYPE_P is a pointer to - where we should place the result type. ATTRIBUTE is the attribute ID. */ - -static tree -Attribute_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, int attribute) -{ - tree gnu_result = error_mark_node; - tree gnu_result_type; - tree gnu_expr; - bool prefix_unused = false; - tree gnu_prefix = gnat_to_gnu (Prefix (gnat_node)); - tree gnu_type = TREE_TYPE (gnu_prefix); - - /* If the input is a NULL_EXPR, make a new one. */ - if (TREE_CODE (gnu_prefix) == NULL_EXPR) - { - *gnu_result_type_p = get_unpadded_type (Etype (gnat_node)); - return build1 (NULL_EXPR, *gnu_result_type_p, - TREE_OPERAND (gnu_prefix, 0)); - } - - switch (attribute) - { - case Attr_Pos: - case Attr_Val: - /* These are just conversions until since representation clauses for - enumerations are handled in the front end. */ - { - bool checkp = Do_Range_Check (First (Expressions (gnat_node))); - - gnu_result = gnat_to_gnu (First (Expressions (gnat_node))); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - gnu_result = convert_with_check (Etype (gnat_node), gnu_result, - checkp, checkp, true); - } - break; - - case Attr_Pred: - case Attr_Succ: - /* These just add or subject the constant 1. Representation clauses for - enumerations are handled in the front-end. */ - gnu_expr = gnat_to_gnu (First (Expressions (gnat_node))); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - - if (Do_Range_Check (First (Expressions (gnat_node)))) - { - gnu_expr = protect_multiple_eval (gnu_expr); - gnu_expr - = emit_check - (build_binary_op (EQ_EXPR, integer_type_node, - gnu_expr, - attribute == Attr_Pred - ? TYPE_MIN_VALUE (gnu_result_type) - : TYPE_MAX_VALUE (gnu_result_type)), - gnu_expr, CE_Range_Check_Failed); - } - - gnu_result - = build_binary_op (attribute == Attr_Pred - ? MINUS_EXPR : PLUS_EXPR, - gnu_result_type, gnu_expr, - convert (gnu_result_type, integer_one_node)); - break; - - case Attr_Address: - case Attr_Unrestricted_Access: - /* Conversions don't change something's address but can cause us to miss - the COMPONENT_REF case below, so strip them off. */ - gnu_prefix = remove_conversions (gnu_prefix, - !Must_Be_Byte_Aligned (gnat_node)); - - /* If we are taking 'Address of an unconstrained object, this is the - pointer to the underlying array. */ - if (attribute == Attr_Address) - gnu_prefix = maybe_unconstrained_array (gnu_prefix); - - /* If we are building a static dispatch table, we have to honor - TARGET_VTABLE_USES_DESCRIPTORS if we want to be compatible - with the C++ ABI. We do it in the non-static case as well, - see gnat_to_gnu_entity, case E_Access_Subprogram_Type. */ - else if (TARGET_VTABLE_USES_DESCRIPTORS - && Is_Dispatch_Table_Entity (Etype (gnat_node))) - { - tree gnu_field, gnu_list = NULL_TREE, t; - /* Descriptors can only be built here for top-level functions. */ - bool build_descriptor = (global_bindings_p () != 0); - int i; - - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - - /* If we're not going to build the descriptor, we have to retrieve - the one which will be built by the linker (or by the compiler - later if a static chain is requested). */ - if (!build_descriptor) - { - gnu_result = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_prefix); - gnu_result = fold_convert (build_pointer_type (gnu_result_type), - gnu_result); - gnu_result = build1 (INDIRECT_REF, gnu_result_type, gnu_result); - } - - for (gnu_field = TYPE_FIELDS (gnu_result_type), i = 0; - i < TARGET_VTABLE_USES_DESCRIPTORS; - gnu_field = TREE_CHAIN (gnu_field), i++) - { - if (build_descriptor) - { - t = build2 (FDESC_EXPR, TREE_TYPE (gnu_field), gnu_prefix, - build_int_cst (NULL_TREE, i)); - TREE_CONSTANT (t) = 1; - } - else - t = build3 (COMPONENT_REF, ptr_void_ftype, gnu_result, - gnu_field, NULL_TREE); - - gnu_list = tree_cons (gnu_field, t, gnu_list); - } - - gnu_result = gnat_build_constructor (gnu_result_type, gnu_list); - break; - } - - /* ... fall through ... */ - - case Attr_Access: - case Attr_Unchecked_Access: - case Attr_Code_Address: - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - gnu_result - = build_unary_op (((attribute == Attr_Address - || attribute == Attr_Unrestricted_Access) - && !Must_Be_Byte_Aligned (gnat_node)) - ? ATTR_ADDR_EXPR : ADDR_EXPR, - gnu_result_type, gnu_prefix); - - /* For 'Code_Address, find an inner ADDR_EXPR and mark it so that we - don't try to build a trampoline. */ - if (attribute == Attr_Code_Address) - { - for (gnu_expr = gnu_result; - CONVERT_EXPR_P (gnu_expr); - gnu_expr = TREE_OPERAND (gnu_expr, 0)) - TREE_CONSTANT (gnu_expr) = 1; - - if (TREE_CODE (gnu_expr) == ADDR_EXPR) - TREE_NO_TRAMPOLINE (gnu_expr) = TREE_CONSTANT (gnu_expr) = 1; - } - - /* For other address attributes applied to a nested function, - find an inner ADDR_EXPR and annotate it so that we can issue - a useful warning with -Wtrampolines. */ - else if (TREE_CODE (TREE_TYPE (gnu_prefix)) == FUNCTION_TYPE) - { - for (gnu_expr = gnu_result; - CONVERT_EXPR_P (gnu_expr); - gnu_expr = TREE_OPERAND (gnu_expr, 0)) - ; - - if (TREE_CODE (gnu_expr) == ADDR_EXPR - && decl_function_context (TREE_OPERAND (gnu_expr, 0))) - { - set_expr_location_from_node (gnu_expr, gnat_node); - - /* Check that we're not violating the No_Implicit_Dynamic_Code - restriction. Be conservative if we don't know anything - about the trampoline strategy for the target. */ - Check_Implicit_Dynamic_Code_Allowed (gnat_node); - } - } - break; - - case Attr_Pool_Address: - { - tree gnu_obj_type; - tree gnu_ptr = gnu_prefix; - - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - - /* If this is an unconstrained array, we know the object must have been - allocated with the template in front of the object. So compute the - template address.*/ - if (TYPE_FAT_POINTER_P (TREE_TYPE (gnu_ptr))) - gnu_ptr - = convert (build_pointer_type - (TYPE_OBJECT_RECORD_TYPE - (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr)))), - gnu_ptr); - - gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr)); - if (TREE_CODE (gnu_obj_type) == RECORD_TYPE - && TYPE_CONTAINS_TEMPLATE_P (gnu_obj_type)) - { - tree gnu_char_ptr_type = build_pointer_type (char_type_node); - tree gnu_pos = byte_position (TYPE_FIELDS (gnu_obj_type)); - tree gnu_byte_offset - = convert (sizetype, - size_diffop (size_zero_node, gnu_pos)); - gnu_byte_offset = fold_build1 (NEGATE_EXPR, sizetype, gnu_byte_offset); - - gnu_ptr = convert (gnu_char_ptr_type, gnu_ptr); - gnu_ptr = build_binary_op (POINTER_PLUS_EXPR, gnu_char_ptr_type, - gnu_ptr, gnu_byte_offset); - } - - gnu_result = convert (gnu_result_type, gnu_ptr); - } - break; - - case Attr_Size: - case Attr_Object_Size: - case Attr_Value_Size: - case Attr_Max_Size_In_Storage_Elements: - gnu_expr = gnu_prefix; - - /* Remove NOPs and conversions between original and packable version - from GNU_EXPR, and conversions from GNU_PREFIX. We use GNU_EXPR - to see if a COMPONENT_REF was involved. */ - while (TREE_CODE (gnu_expr) == NOP_EXPR - || (TREE_CODE (gnu_expr) == VIEW_CONVERT_EXPR - && TREE_CODE (TREE_TYPE (gnu_expr)) == RECORD_TYPE - && TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))) - == RECORD_TYPE - && TYPE_NAME (TREE_TYPE (gnu_expr)) - == TYPE_NAME (TREE_TYPE (TREE_OPERAND (gnu_expr, 0))))) - gnu_expr = TREE_OPERAND (gnu_expr, 0); - - gnu_prefix = remove_conversions (gnu_prefix, true); - prefix_unused = true; - gnu_type = TREE_TYPE (gnu_prefix); - - /* Replace an unconstrained array type with the type of the underlying - array. We can't do this with a call to maybe_unconstrained_array - since we may have a TYPE_DECL. For 'Max_Size_In_Storage_Elements, - use the record type that will be used to allocate the object and its - template. */ - if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE) - { - gnu_type = TYPE_OBJECT_RECORD_TYPE (gnu_type); - if (attribute != Attr_Max_Size_In_Storage_Elements) - gnu_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))); - } - - /* If we're looking for the size of a field, return the field size. - Otherwise, if the prefix is an object, or if 'Object_Size or - 'Max_Size_In_Storage_Elements has been specified, the result is the - GCC size of the type. Otherwise, the result is the RM_Size of the - type. */ - if (TREE_CODE (gnu_prefix) == COMPONENT_REF) - gnu_result = DECL_SIZE (TREE_OPERAND (gnu_prefix, 1)); - else if (TREE_CODE (gnu_prefix) != TYPE_DECL - || attribute == Attr_Object_Size - || attribute == Attr_Max_Size_In_Storage_Elements) - { - /* If this is a padded type, the GCC size isn't relevant to the - programmer. Normally, what we want is the RM_Size, which was set - from the specified size, but if it was not set, we want the size - of the relevant field. Using the MAX of those two produces the - right result in all case. Don't use the size of the field if it's - a self-referential type, since that's never what's wanted. */ - if (TREE_CODE (gnu_type) == RECORD_TYPE - && TYPE_IS_PADDING_P (gnu_type) - && TREE_CODE (gnu_expr) == COMPONENT_REF) - { - gnu_result = rm_size (gnu_type); - if (!(CONTAINS_PLACEHOLDER_P - (DECL_SIZE (TREE_OPERAND (gnu_expr, 1))))) - gnu_result - = size_binop (MAX_EXPR, gnu_result, - DECL_SIZE (TREE_OPERAND (gnu_expr, 1))); - } - else if (Nkind (Prefix (gnat_node)) == N_Explicit_Dereference) - { - Node_Id gnat_deref = Prefix (gnat_node); - Node_Id gnat_actual_subtype = Actual_Designated_Subtype (gnat_deref); - tree gnu_ptr_type = TREE_TYPE (gnat_to_gnu (Prefix (gnat_deref))); - if (TYPE_FAT_OR_THIN_POINTER_P (gnu_ptr_type) - && Present (gnat_actual_subtype)) - { - tree gnu_actual_obj_type = gnat_to_gnu_type (gnat_actual_subtype); - gnu_type = build_unc_object_type_from_ptr (gnu_ptr_type, - gnu_actual_obj_type, get_identifier ("SIZE")); - } - - gnu_result = TYPE_SIZE (gnu_type); - } - else - gnu_result = TYPE_SIZE (gnu_type); - } - else - gnu_result = rm_size (gnu_type); - - gcc_assert (gnu_result); - - /* Deal with a self-referential size by returning the maximum size for a - type and by qualifying the size with the object for 'Size of an - object. */ - if (CONTAINS_PLACEHOLDER_P (gnu_result)) - { - if (TREE_CODE (gnu_prefix) != TYPE_DECL) - gnu_result = substitute_placeholder_in_expr (gnu_result, gnu_expr); - else - gnu_result = max_size (gnu_result, true); - } - - /* If the type contains a template, subtract its size. */ - if (TREE_CODE (gnu_type) == RECORD_TYPE - && TYPE_CONTAINS_TEMPLATE_P (gnu_type)) - gnu_result = size_binop (MINUS_EXPR, gnu_result, - DECL_SIZE (TYPE_FIELDS (gnu_type))); - - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - - /* Always perform division using unsigned arithmetic as the size cannot - be negative, but may be an overflowed positive value. This provides - correct results for sizes up to 512 MB. - - ??? Size should be calculated in storage elements directly. */ - - if (attribute == Attr_Max_Size_In_Storage_Elements) - gnu_result = convert (sizetype, - fold_build2 (CEIL_DIV_EXPR, bitsizetype, - gnu_result, bitsize_unit_node)); - break; - - case Attr_Alignment: - if (TREE_CODE (gnu_prefix) == COMPONENT_REF - && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0))) - == RECORD_TYPE) - && (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0))))) - gnu_prefix = TREE_OPERAND (gnu_prefix, 0); - - gnu_type = TREE_TYPE (gnu_prefix); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - prefix_unused = true; - - gnu_result = size_int ((TREE_CODE (gnu_prefix) == COMPONENT_REF - ? DECL_ALIGN (TREE_OPERAND (gnu_prefix, 1)) - : TYPE_ALIGN (gnu_type)) / BITS_PER_UNIT); - break; - - case Attr_First: - case Attr_Last: - case Attr_Range_Length: - prefix_unused = true; - - if (INTEGRAL_TYPE_P (gnu_type) || TREE_CODE (gnu_type) == REAL_TYPE) - { - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - - if (attribute == Attr_First) - gnu_result = TYPE_MIN_VALUE (gnu_type); - else if (attribute == Attr_Last) - gnu_result = TYPE_MAX_VALUE (gnu_type); - else - gnu_result - = build_binary_op - (MAX_EXPR, get_base_type (gnu_result_type), - build_binary_op - (PLUS_EXPR, get_base_type (gnu_result_type), - build_binary_op (MINUS_EXPR, - get_base_type (gnu_result_type), - convert (gnu_result_type, - TYPE_MAX_VALUE (gnu_type)), - convert (gnu_result_type, - TYPE_MIN_VALUE (gnu_type))), - convert (gnu_result_type, integer_one_node)), - convert (gnu_result_type, integer_zero_node)); - - break; - } - - /* ... fall through ... */ - - case Attr_Length: - { - int Dimension = (Present (Expressions (gnat_node)) - ? UI_To_Int (Intval (First (Expressions (gnat_node)))) - : 1), i; - struct parm_attr *pa = NULL; - Entity_Id gnat_param = Empty; - - /* Make sure any implicit dereference gets done. */ - gnu_prefix = maybe_implicit_deref (gnu_prefix); - gnu_prefix = maybe_unconstrained_array (gnu_prefix); - /* We treat unconstrained array In parameters specially. */ - if (Nkind (Prefix (gnat_node)) == N_Identifier - && !Is_Constrained (Etype (Prefix (gnat_node))) - && Ekind (Entity (Prefix (gnat_node))) == E_In_Parameter) - gnat_param = Entity (Prefix (gnat_node)); - gnu_type = TREE_TYPE (gnu_prefix); - prefix_unused = true; - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - - if (TYPE_CONVENTION_FORTRAN_P (gnu_type)) - { - int ndim; - tree gnu_type_temp; - - for (ndim = 1, gnu_type_temp = gnu_type; - TREE_CODE (TREE_TYPE (gnu_type_temp)) == ARRAY_TYPE - && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type_temp)); - ndim++, gnu_type_temp = TREE_TYPE (gnu_type_temp)) - ; - - Dimension = ndim + 1 - Dimension; - } - - for (i = 1; i < Dimension; i++) - gnu_type = TREE_TYPE (gnu_type); - - gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE); - - /* When not optimizing, look up the slot associated with the parameter - and the dimension in the cache and create a new one on failure. */ - if (!optimize && Present (gnat_param)) - { - for (i = 0; VEC_iterate (parm_attr, f_parm_attr_cache, i, pa); i++) - if (pa->id == gnat_param && pa->dim == Dimension) - break; - - if (!pa) - { - pa = GGC_CNEW (struct parm_attr); - pa->id = gnat_param; - pa->dim = Dimension; - VEC_safe_push (parm_attr, gc, f_parm_attr_cache, pa); - } - } - - /* Return the cached expression or build a new one. */ - if (attribute == Attr_First) - { - if (pa && pa->first) - { - gnu_result = pa->first; - break; - } - - gnu_result - = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))); - } - - else if (attribute == Attr_Last) - { - if (pa && pa->last) - { - gnu_result = pa->last; - break; - } - - gnu_result - = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))); - } - - else /* attribute == Attr_Range_Length || attribute == Attr_Length */ - { - if (pa && pa->length) - { - gnu_result = pa->length; - break; - } - else - { - /* We used to compute the length as max (hb - lb + 1, 0), - which could overflow for some cases of empty arrays, e.g. - when lb == index_type'first. We now compute the length as - (hb < lb) ? 0 : hb - lb + 1, which would only overflow in - much rarer cases, for extremely large arrays we expect - never to encounter in practice. In addition, the former - computation required the use of potentially constraining - signed arithmetic while the latter doesn't. Note that the - comparison must be done in the original index base type, - otherwise the conversion of either bound to gnu_compute_type - may overflow. */ - - tree gnu_compute_type = get_base_type (gnu_result_type); - - tree index_type - = TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)); - tree lb - = convert (gnu_compute_type, TYPE_MIN_VALUE (index_type)); - tree hb - = convert (gnu_compute_type, TYPE_MAX_VALUE (index_type)); - - gnu_result - = build3 - (COND_EXPR, gnu_compute_type, - build_binary_op (LT_EXPR, get_base_type (index_type), - TYPE_MAX_VALUE (index_type), - TYPE_MIN_VALUE (index_type)), - convert (gnu_compute_type, integer_zero_node), - build_binary_op - (PLUS_EXPR, gnu_compute_type, - build_binary_op (MINUS_EXPR, gnu_compute_type, hb, lb), - convert (gnu_compute_type, integer_one_node))); - } - } - - /* If this has a PLACEHOLDER_EXPR, qualify it by the object we are - handling. Note that these attributes could not have been used on - an unconstrained array type. */ - gnu_result = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result, - gnu_prefix); - - /* Cache the expression we have just computed. Since we want to do it - at runtime, we force the use of a SAVE_EXPR and let the gimplifier - create the temporary. */ - if (pa) - { - gnu_result - = build1 (SAVE_EXPR, TREE_TYPE (gnu_result), gnu_result); - TREE_SIDE_EFFECTS (gnu_result) = 1; - if (attribute == Attr_First) - pa->first = gnu_result; - else if (attribute == Attr_Last) - pa->last = gnu_result; - else - pa->length = gnu_result; - } - break; - } - - case Attr_Bit_Position: - case Attr_Position: - case Attr_First_Bit: - case Attr_Last_Bit: - case Attr_Bit: - { - HOST_WIDE_INT bitsize; - HOST_WIDE_INT bitpos; - tree gnu_offset; - tree gnu_field_bitpos; - tree gnu_field_offset; - tree gnu_inner; - enum machine_mode mode; - int unsignedp, volatilep; - - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - gnu_prefix = remove_conversions (gnu_prefix, true); - prefix_unused = true; - - /* We can have 'Bit on any object, but if it isn't a COMPONENT_REF, - the result is 0. Don't allow 'Bit on a bare component, though. */ - if (attribute == Attr_Bit - && TREE_CODE (gnu_prefix) != COMPONENT_REF - && TREE_CODE (gnu_prefix) != FIELD_DECL) - { - gnu_result = integer_zero_node; - break; - } - - else - gcc_assert (TREE_CODE (gnu_prefix) == COMPONENT_REF - || (attribute == Attr_Bit_Position - && TREE_CODE (gnu_prefix) == FIELD_DECL)); - - get_inner_reference (gnu_prefix, &bitsize, &bitpos, &gnu_offset, - &mode, &unsignedp, &volatilep, false); - - if (TREE_CODE (gnu_prefix) == COMPONENT_REF) - { - gnu_field_bitpos = bit_position (TREE_OPERAND (gnu_prefix, 1)); - gnu_field_offset = byte_position (TREE_OPERAND (gnu_prefix, 1)); - - for (gnu_inner = TREE_OPERAND (gnu_prefix, 0); - TREE_CODE (gnu_inner) == COMPONENT_REF - && DECL_INTERNAL_P (TREE_OPERAND (gnu_inner, 1)); - gnu_inner = TREE_OPERAND (gnu_inner, 0)) - { - gnu_field_bitpos - = size_binop (PLUS_EXPR, gnu_field_bitpos, - bit_position (TREE_OPERAND (gnu_inner, 1))); - gnu_field_offset - = size_binop (PLUS_EXPR, gnu_field_offset, - byte_position (TREE_OPERAND (gnu_inner, 1))); - } - } - else if (TREE_CODE (gnu_prefix) == FIELD_DECL) - { - gnu_field_bitpos = bit_position (gnu_prefix); - gnu_field_offset = byte_position (gnu_prefix); - } - else - { - gnu_field_bitpos = bitsize_zero_node; - gnu_field_offset = size_zero_node; - } - - switch (attribute) - { - case Attr_Position: - gnu_result = gnu_field_offset; - break; - - case Attr_First_Bit: - case Attr_Bit: - gnu_result = size_int (bitpos % BITS_PER_UNIT); - break; - - case Attr_Last_Bit: - gnu_result = bitsize_int (bitpos % BITS_PER_UNIT); - gnu_result = size_binop (PLUS_EXPR, gnu_result, - TYPE_SIZE (TREE_TYPE (gnu_prefix))); - gnu_result = size_binop (MINUS_EXPR, gnu_result, - bitsize_one_node); - break; - - case Attr_Bit_Position: - gnu_result = gnu_field_bitpos; - break; - } - - /* If this has a PLACEHOLDER_EXPR, qualify it by the object - we are handling. */ - gnu_result = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result, gnu_prefix); - break; - } - - case Attr_Min: - case Attr_Max: - { - tree gnu_lhs = gnat_to_gnu (First (Expressions (gnat_node))); - tree gnu_rhs = gnat_to_gnu (Next (First (Expressions (gnat_node)))); - - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - gnu_result = build_binary_op (attribute == Attr_Min - ? MIN_EXPR : MAX_EXPR, - gnu_result_type, gnu_lhs, gnu_rhs); - } - break; - - case Attr_Passed_By_Reference: - gnu_result = size_int (default_pass_by_ref (gnu_type) - || must_pass_by_ref (gnu_type)); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - break; - - case Attr_Component_Size: - if (TREE_CODE (gnu_prefix) == COMPONENT_REF - && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0))) - == RECORD_TYPE) - && (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0))))) - gnu_prefix = TREE_OPERAND (gnu_prefix, 0); - - gnu_prefix = maybe_implicit_deref (gnu_prefix); - gnu_type = TREE_TYPE (gnu_prefix); - - if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE) - gnu_type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_type)))); - - while (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE - && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type))) - gnu_type = TREE_TYPE (gnu_type); - - gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE); - - /* Note this size cannot be self-referential. */ - gnu_result = TYPE_SIZE (TREE_TYPE (gnu_type)); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - prefix_unused = true; - break; - - case Attr_Null_Parameter: - /* This is just a zero cast to the pointer type for - our prefix and dereferenced. */ - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - gnu_result - = build_unary_op (INDIRECT_REF, NULL_TREE, - convert (build_pointer_type (gnu_result_type), - integer_zero_node)); - TREE_PRIVATE (gnu_result) = 1; - break; - - case Attr_Mechanism_Code: - { - int code; - Entity_Id gnat_obj = Entity (Prefix (gnat_node)); - - prefix_unused = true; - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - if (Present (Expressions (gnat_node))) - { - int i = UI_To_Int (Intval (First (Expressions (gnat_node)))); - - for (gnat_obj = First_Formal (gnat_obj); i > 1; - i--, gnat_obj = Next_Formal (gnat_obj)) - ; - } - - code = Mechanism (gnat_obj); - if (code == Default) - code = ((present_gnu_tree (gnat_obj) - && (DECL_BY_REF_P (get_gnu_tree (gnat_obj)) - || ((TREE_CODE (get_gnu_tree (gnat_obj)) - == PARM_DECL) - && (DECL_BY_COMPONENT_PTR_P - (get_gnu_tree (gnat_obj)))))) - ? By_Reference : By_Copy); - gnu_result = convert (gnu_result_type, size_int (- code)); - } - break; - - default: - /* Say we have an unimplemented attribute. Then set the value to be - returned to be a zero and hope that's something we can convert to the - type of this attribute. */ - post_error ("unimplemented attribute", gnat_node); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - gnu_result = integer_zero_node; - break; - } - - /* If this is an attribute where the prefix was unused, force a use of it if - it has a side-effect. But don't do it if the prefix is just an entity - name. However, if an access check is needed, we must do it. See second - example in AARM 11.6(5.e). */ - if (prefix_unused && TREE_SIDE_EFFECTS (gnu_prefix) - && !Is_Entity_Name (Prefix (gnat_node))) - gnu_result = fold_build2 (COMPOUND_EXPR, TREE_TYPE (gnu_result), - gnu_prefix, gnu_result); - - *gnu_result_type_p = gnu_result_type; - return gnu_result; -} - -/* Subroutine of gnat_to_gnu to translate gnat_node, an N_Case_Statement, - to a GCC tree, which is returned. */ - -static tree -Case_Statement_to_gnu (Node_Id gnat_node) -{ - tree gnu_result; - tree gnu_expr; - Node_Id gnat_when; - - gnu_expr = gnat_to_gnu (Expression (gnat_node)); - gnu_expr = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr); - - /* The range of values in a case statement is determined by the rules in - RM 5.4(7-9). In almost all cases, this range is represented by the Etype - of the expression. One exception arises in the case of a simple name that - is parenthesized. This still has the Etype of the name, but since it is - not a name, para 7 does not apply, and we need to go to the base type. - This is the only case where parenthesization affects the dynamic - semantics (i.e. the range of possible values at runtime that is covered - by the others alternative. - - Another exception is if the subtype of the expression is non-static. In - that case, we also have to use the base type. */ - if (Paren_Count (Expression (gnat_node)) != 0 - || !Is_OK_Static_Subtype (Underlying_Type - (Etype (Expression (gnat_node))))) - gnu_expr = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr); - - /* We build a SWITCH_EXPR that contains the code with interspersed - CASE_LABEL_EXPRs for each label. */ - - push_stack (&gnu_switch_label_stack, NULL_TREE, create_artificial_label ()); - start_stmt_group (); - for (gnat_when = First_Non_Pragma (Alternatives (gnat_node)); - Present (gnat_when); - gnat_when = Next_Non_Pragma (gnat_when)) - { - Node_Id gnat_choice; - int choices_added = 0; - - /* First compile all the different case choices for the current WHEN - alternative. */ - for (gnat_choice = First (Discrete_Choices (gnat_when)); - Present (gnat_choice); gnat_choice = Next (gnat_choice)) - { - tree gnu_low = NULL_TREE, gnu_high = NULL_TREE; - - switch (Nkind (gnat_choice)) - { - case N_Range: - gnu_low = gnat_to_gnu (Low_Bound (gnat_choice)); - gnu_high = gnat_to_gnu (High_Bound (gnat_choice)); - break; - - case N_Subtype_Indication: - gnu_low = gnat_to_gnu (Low_Bound (Range_Expression - (Constraint (gnat_choice)))); - gnu_high = gnat_to_gnu (High_Bound (Range_Expression - (Constraint (gnat_choice)))); - break; - - case N_Identifier: - case N_Expanded_Name: - /* This represents either a subtype range or a static value of - some kind; Ekind says which. */ - if (IN (Ekind (Entity (gnat_choice)), Type_Kind)) - { - tree gnu_type = get_unpadded_type (Entity (gnat_choice)); - - gnu_low = fold (TYPE_MIN_VALUE (gnu_type)); - gnu_high = fold (TYPE_MAX_VALUE (gnu_type)); - break; - } - - /* ... fall through ... */ - - case N_Character_Literal: - case N_Integer_Literal: - gnu_low = gnat_to_gnu (gnat_choice); - break; - - case N_Others_Choice: - break; - - default: - gcc_unreachable (); - } - - /* If the case value is a subtype that raises Constraint_Error at - run-time because of a wrong bound, then gnu_low or gnu_high is - not translated into an INTEGER_CST. In such a case, we need - to ensure that the when statement is not added in the tree, - otherwise it will crash the gimplifier. */ - if ((!gnu_low || TREE_CODE (gnu_low) == INTEGER_CST) - && (!gnu_high || TREE_CODE (gnu_high) == INTEGER_CST)) - { - add_stmt_with_node (build3 (CASE_LABEL_EXPR, void_type_node, - gnu_low, gnu_high, - create_artificial_label ()), - gnat_choice); - choices_added++; - } - } - - /* Push a binding level here in case variables are declared as we want - them to be local to this set of statements instead of to the block - containing the Case statement. */ - if (choices_added > 0) - { - add_stmt (build_stmt_group (Statements (gnat_when), true)); - add_stmt (build1 (GOTO_EXPR, void_type_node, - TREE_VALUE (gnu_switch_label_stack))); - } - } - - /* Now emit a definition of the label all the cases branched to. */ - add_stmt (build1 (LABEL_EXPR, void_type_node, - TREE_VALUE (gnu_switch_label_stack))); - gnu_result = build3 (SWITCH_EXPR, TREE_TYPE (gnu_expr), gnu_expr, - end_stmt_group (), NULL_TREE); - pop_stack (&gnu_switch_label_stack); - - return gnu_result; -} - -/* Subroutine of gnat_to_gnu to translate gnat_node, an N_Loop_Statement, - to a GCC tree, which is returned. */ - -static tree -Loop_Statement_to_gnu (Node_Id gnat_node) -{ - /* ??? It would be nice to use "build" here, but there's no build5. */ - tree gnu_loop_stmt = build_nt (LOOP_STMT, NULL_TREE, NULL_TREE, - NULL_TREE, NULL_TREE, NULL_TREE); - tree gnu_loop_var = NULL_TREE; - Node_Id gnat_iter_scheme = Iteration_Scheme (gnat_node); - tree gnu_cond_expr = NULL_TREE; - tree gnu_result; - - TREE_TYPE (gnu_loop_stmt) = void_type_node; - TREE_SIDE_EFFECTS (gnu_loop_stmt) = 1; - LOOP_STMT_LABEL (gnu_loop_stmt) = create_artificial_label (); - set_expr_location_from_node (gnu_loop_stmt, gnat_node); - Sloc_to_locus (Sloc (End_Label (gnat_node)), - &DECL_SOURCE_LOCATION (LOOP_STMT_LABEL (gnu_loop_stmt))); - - /* Save the end label of this LOOP_STMT in a stack so that the corresponding - N_Exit_Statement can find it. */ - push_stack (&gnu_loop_label_stack, NULL_TREE, - LOOP_STMT_LABEL (gnu_loop_stmt)); - - /* Set the condition under which the loop must keep going. - For the case "LOOP .... END LOOP;" the condition is always true. */ - if (No (gnat_iter_scheme)) - ; - - /* For the case "WHILE condition LOOP ..... END LOOP;" it's immediate. */ - else if (Present (Condition (gnat_iter_scheme))) - LOOP_STMT_TOP_COND (gnu_loop_stmt) - = gnat_to_gnu (Condition (gnat_iter_scheme)); - - /* Otherwise we have an iteration scheme and the condition is given by - the bounds of the subtype of the iteration variable. */ - else - { - Node_Id gnat_loop_spec = Loop_Parameter_Specification (gnat_iter_scheme); - Entity_Id gnat_loop_var = Defining_Entity (gnat_loop_spec); - Entity_Id gnat_type = Etype (gnat_loop_var); - tree gnu_type = get_unpadded_type (gnat_type); - tree gnu_low = TYPE_MIN_VALUE (gnu_type); - tree gnu_high = TYPE_MAX_VALUE (gnu_type); - tree gnu_first, gnu_last, gnu_limit; - enum tree_code update_code, end_code; - tree gnu_base_type = get_base_type (gnu_type); - - /* We must disable modulo reduction for the loop variable, if any, - in order for the loop comparison to be effective. */ - if (Reverse_Present (gnat_loop_spec)) - { - gnu_first = gnu_high; - gnu_last = gnu_low; - update_code = MINUS_NOMOD_EXPR; - end_code = GE_EXPR; - gnu_limit = TYPE_MIN_VALUE (gnu_base_type); - } - else - { - gnu_first = gnu_low; - gnu_last = gnu_high; - update_code = PLUS_NOMOD_EXPR; - end_code = LE_EXPR; - gnu_limit = TYPE_MAX_VALUE (gnu_base_type); - } - - /* We know the loop variable will not overflow if GNU_LAST is a constant - and is not equal to GNU_LIMIT. If it might overflow, we have to move - the limit test to the end of the loop. In that case, we have to test - for an empty loop outside the loop. */ - if (TREE_CODE (gnu_last) != INTEGER_CST - || TREE_CODE (gnu_limit) != INTEGER_CST - || tree_int_cst_equal (gnu_last, gnu_limit)) - { - gnu_cond_expr - = build3 (COND_EXPR, void_type_node, - build_binary_op (LE_EXPR, integer_type_node, - gnu_low, gnu_high), - NULL_TREE, alloc_stmt_list ()); - set_expr_location_from_node (gnu_cond_expr, gnat_loop_spec); - } - - /* Open a new nesting level that will surround the loop to declare the - loop index variable. */ - start_stmt_group (); - gnat_pushlevel (); - - /* Declare the loop index and set it to its initial value. */ - gnu_loop_var = gnat_to_gnu_entity (gnat_loop_var, gnu_first, 1); - if (DECL_BY_REF_P (gnu_loop_var)) - gnu_loop_var = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_loop_var); - - /* The loop variable might be a padded type, so use `convert' to get a - reference to the inner variable if so. */ - gnu_loop_var = convert (get_base_type (gnu_type), gnu_loop_var); - - /* Set either the top or bottom exit condition as appropriate depending - on whether or not we know an overflow cannot occur. */ - if (gnu_cond_expr) - LOOP_STMT_BOT_COND (gnu_loop_stmt) - = build_binary_op (NE_EXPR, integer_type_node, - gnu_loop_var, gnu_last); - else - LOOP_STMT_TOP_COND (gnu_loop_stmt) - = build_binary_op (end_code, integer_type_node, - gnu_loop_var, gnu_last); - - LOOP_STMT_UPDATE (gnu_loop_stmt) - = build_binary_op (MODIFY_EXPR, NULL_TREE, - gnu_loop_var, - build_binary_op (update_code, - TREE_TYPE (gnu_loop_var), - gnu_loop_var, - convert (TREE_TYPE (gnu_loop_var), - integer_one_node))); - set_expr_location_from_node (LOOP_STMT_UPDATE (gnu_loop_stmt), - gnat_iter_scheme); - } - - /* If the loop was named, have the name point to this loop. In this case, - the association is not a ..._DECL node, but the end label from this - LOOP_STMT. */ - if (Present (Identifier (gnat_node))) - save_gnu_tree (Entity (Identifier (gnat_node)), - LOOP_STMT_LABEL (gnu_loop_stmt), true); - - /* Make the loop body into its own block, so any allocated storage will be - released every iteration. This is needed for stack allocation. */ - LOOP_STMT_BODY (gnu_loop_stmt) - = build_stmt_group (Statements (gnat_node), true); - - /* If we declared a variable, then we are in a statement group for that - declaration. Add the LOOP_STMT to it and make that the "loop". */ - if (gnu_loop_var) - { - add_stmt (gnu_loop_stmt); - gnat_poplevel (); - gnu_loop_stmt = end_stmt_group (); - } - - /* If we have an outer COND_EXPR, that's our result and this loop is its - "true" statement. Otherwise, the result is the LOOP_STMT. */ - if (gnu_cond_expr) - { - COND_EXPR_THEN (gnu_cond_expr) = gnu_loop_stmt; - gnu_result = gnu_cond_expr; - recalculate_side_effects (gnu_cond_expr); - } - else - gnu_result = gnu_loop_stmt; - - pop_stack (&gnu_loop_label_stack); - - return gnu_result; -} - -/* Emit statements to establish __gnat_handle_vms_condition as a VMS condition - handler for the current function. */ - -/* This is implemented by issuing a call to the appropriate VMS specific - builtin. To avoid having VMS specific sections in the global gigi decls - array, we maintain the decls of interest here. We can't declare them - inside the function because we must mark them never to be GC'd, which we - can only do at the global level. */ - -static GTY(()) tree vms_builtin_establish_handler_decl = NULL_TREE; -static GTY(()) tree gnat_vms_condition_handler_decl = NULL_TREE; - -static void -establish_gnat_vms_condition_handler (void) -{ - tree establish_stmt; - - /* Elaborate the required decls on the first call. Check on the decl for - the gnat condition handler to decide, as this is one we create so we are - sure that it will be non null on subsequent calls. The builtin decl is - looked up so remains null on targets where it is not implemented yet. */ - if (gnat_vms_condition_handler_decl == NULL_TREE) - { - vms_builtin_establish_handler_decl - = builtin_decl_for - (get_identifier ("__builtin_establish_vms_condition_handler")); - - gnat_vms_condition_handler_decl - = create_subprog_decl (get_identifier ("__gnat_handle_vms_condition"), - NULL_TREE, - build_function_type_list (integer_type_node, - ptr_void_type_node, - ptr_void_type_node, - NULL_TREE), - NULL_TREE, 0, 1, 1, 0, Empty); - } - - /* Do nothing if the establish builtin is not available, which might happen - on targets where the facility is not implemented. */ - if (vms_builtin_establish_handler_decl == NULL_TREE) - return; - - establish_stmt - = build_call_1_expr (vms_builtin_establish_handler_decl, - build_unary_op - (ADDR_EXPR, NULL_TREE, - gnat_vms_condition_handler_decl)); - - add_stmt (establish_stmt); -} - -/* Subroutine of gnat_to_gnu to process gnat_node, an N_Subprogram_Body. We - don't return anything. */ - -static void -Subprogram_Body_to_gnu (Node_Id gnat_node) -{ - /* Defining identifier of a parameter to the subprogram. */ - Entity_Id gnat_param; - /* The defining identifier for the subprogram body. Note that if a - specification has appeared before for this body, then the identifier - occurring in that specification will also be a defining identifier and all - the calls to this subprogram will point to that specification. */ - Entity_Id gnat_subprog_id - = (Present (Corresponding_Spec (gnat_node)) - ? Corresponding_Spec (gnat_node) : Defining_Entity (gnat_node)); - /* The FUNCTION_DECL node corresponding to the subprogram spec. */ - tree gnu_subprog_decl; - /* The FUNCTION_TYPE node corresponding to the subprogram spec. */ - tree gnu_subprog_type; - tree gnu_cico_list; - tree gnu_result; - VEC(parm_attr,gc) *cache; - - /* If this is a generic object or if it has been eliminated, - ignore it. */ - if (Ekind (gnat_subprog_id) == E_Generic_Procedure - || Ekind (gnat_subprog_id) == E_Generic_Function - || Is_Eliminated (gnat_subprog_id)) - return; - - /* If this subprogram acts as its own spec, define it. Otherwise, just get - the already-elaborated tree node. However, if this subprogram had its - elaboration deferred, we will already have made a tree node for it. So - treat it as not being defined in that case. Such a subprogram cannot - have an address clause or a freeze node, so this test is safe, though it - does disable some otherwise-useful error checking. */ - gnu_subprog_decl - = gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, - Acts_As_Spec (gnat_node) - && !present_gnu_tree (gnat_subprog_id)); - - gnu_subprog_type = TREE_TYPE (gnu_subprog_decl); - - /* Propagate the debug mode. */ - if (!Needs_Debug_Info (gnat_subprog_id)) - DECL_IGNORED_P (gnu_subprog_decl) = 1; - - /* Set the line number in the decl to correspond to that of the body so that - the line number notes are written correctly. */ - Sloc_to_locus (Sloc (gnat_node), &DECL_SOURCE_LOCATION (gnu_subprog_decl)); - - /* Initialize the information structure for the function. */ - allocate_struct_function (gnu_subprog_decl, false); - DECL_STRUCT_FUNCTION (gnu_subprog_decl)->language - = GGC_CNEW (struct language_function); - - begin_subprog_body (gnu_subprog_decl); - gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type); - - /* If there are Out parameters, we need to ensure that the return statement - properly copies them out. We do this by making a new block and converting - any inner return into a goto to a label at the end of the block. */ - push_stack (&gnu_return_label_stack, NULL_TREE, - gnu_cico_list ? create_artificial_label () : NULL_TREE); - - /* Get a tree corresponding to the code for the subprogram. */ - start_stmt_group (); - gnat_pushlevel (); - - /* See if there are any parameters for which we don't yet have GCC entities. - These must be for Out parameters for which we will be making VAR_DECL - nodes here. Fill them in to TYPE_CI_CO_LIST, which must contain the empty - entry as well. We can match up the entries because TYPE_CI_CO_LIST is in - the order of the parameters. */ - for (gnat_param = First_Formal_With_Extras (gnat_subprog_id); - Present (gnat_param); - gnat_param = Next_Formal_With_Extras (gnat_param)) - if (!present_gnu_tree (gnat_param)) - { - /* Skip any entries that have been already filled in; they must - correspond to In Out parameters. */ - for (; gnu_cico_list && TREE_VALUE (gnu_cico_list); - gnu_cico_list = TREE_CHAIN (gnu_cico_list)) - ; - - /* Do any needed references for padded types. */ - TREE_VALUE (gnu_cico_list) - = convert (TREE_TYPE (TREE_PURPOSE (gnu_cico_list)), - gnat_to_gnu_entity (gnat_param, NULL_TREE, 1)); - } - - /* On VMS, establish our condition handler to possibly turn a condition into - the corresponding exception if the subprogram has a foreign convention or - is exported. - - To ensure proper execution of local finalizations on condition instances, - we must turn a condition into the corresponding exception even if there - is no applicable Ada handler, and need at least one condition handler per - possible call chain involving GNAT code. OTOH, establishing the handler - has a cost so we want to minimize the number of subprograms into which - this happens. The foreign or exported condition is expected to satisfy - all the constraints. */ - if (TARGET_ABI_OPEN_VMS - && (Has_Foreign_Convention (gnat_node) || Is_Exported (gnat_node))) - establish_gnat_vms_condition_handler (); - - process_decls (Declarations (gnat_node), Empty, Empty, true, true); - - /* Generate the code of the subprogram itself. A return statement will be - present and any Out parameters will be handled there. */ - add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node))); - gnat_poplevel (); - gnu_result = end_stmt_group (); - - /* If we populated the parameter attributes cache, we need to make sure - that the cached expressions are evaluated on all possible paths. */ - cache = DECL_STRUCT_FUNCTION (gnu_subprog_decl)->language->parm_attr_cache; - if (cache) - { - struct parm_attr *pa; - int i; - - start_stmt_group (); - - for (i = 0; VEC_iterate (parm_attr, cache, i, pa); i++) - { - if (pa->first) - add_stmt_with_node (pa->first, gnat_node); - if (pa->last) - add_stmt_with_node (pa->last, gnat_node); - if (pa->length) - add_stmt_with_node (pa->length, gnat_node); - } - - add_stmt (gnu_result); - gnu_result = end_stmt_group (); - } - - /* If we made a special return label, we need to make a block that contains - the definition of that label and the copying to the return value. That - block first contains the function, then the label and copy statement. */ - if (TREE_VALUE (gnu_return_label_stack)) - { - tree gnu_retval; - - start_stmt_group (); - gnat_pushlevel (); - add_stmt (gnu_result); - add_stmt (build1 (LABEL_EXPR, void_type_node, - TREE_VALUE (gnu_return_label_stack))); - - gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type); - if (list_length (gnu_cico_list) == 1) - gnu_retval = TREE_VALUE (gnu_cico_list); - else - gnu_retval = gnat_build_constructor (TREE_TYPE (gnu_subprog_type), - gnu_cico_list); - - if (DECL_P (gnu_retval) && DECL_BY_REF_P (gnu_retval)) - gnu_retval = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_retval); - - add_stmt_with_node - (build_return_expr (DECL_RESULT (gnu_subprog_decl), gnu_retval), - End_Label (Handled_Statement_Sequence (gnat_node))); - gnat_poplevel (); - gnu_result = end_stmt_group (); - } - - pop_stack (&gnu_return_label_stack); - - /* Set the end location. */ - Sloc_to_locus - ((Present (End_Label (Handled_Statement_Sequence (gnat_node))) - ? Sloc (End_Label (Handled_Statement_Sequence (gnat_node))) - : Sloc (gnat_node)), - &DECL_STRUCT_FUNCTION (gnu_subprog_decl)->function_end_locus); - - end_subprog_body (gnu_result, false); - - /* Disconnect the trees for parameters that we made variables for from the - GNAT entities since these are unusable after we end the function. */ - for (gnat_param = First_Formal_With_Extras (gnat_subprog_id); - Present (gnat_param); - gnat_param = Next_Formal_With_Extras (gnat_param)) - if (TREE_CODE (get_gnu_tree (gnat_param)) == VAR_DECL) - save_gnu_tree (gnat_param, NULL_TREE, false); - - if (DECL_FUNCTION_STUB (gnu_subprog_decl)) - build_function_stub (gnu_subprog_decl, gnat_subprog_id); - - mark_out_of_scope (Defining_Unit_Name (Specification (gnat_node))); -} - -/* Subroutine of gnat_to_gnu to translate gnat_node, either an N_Function_Call - or an N_Procedure_Call_Statement, to a GCC tree, which is returned. - GNU_RESULT_TYPE_P is a pointer to where we should place the result type. - If GNU_TARGET is non-null, this must be a function call and the result - of the call is to be placed into that object. */ - -static tree -call_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, tree gnu_target) -{ - tree gnu_result; - /* The GCC node corresponding to the GNAT subprogram name. This can either - be a FUNCTION_DECL node if we are dealing with a standard subprogram call, - or an indirect reference expression (an INDIRECT_REF node) pointing to a - subprogram. */ - tree gnu_subprog_node = gnat_to_gnu (Name (gnat_node)); - /* The FUNCTION_TYPE node giving the GCC type of the subprogram. */ - tree gnu_subprog_type = TREE_TYPE (gnu_subprog_node); - tree gnu_subprog_addr = build_unary_op (ADDR_EXPR, NULL_TREE, - gnu_subprog_node); - Entity_Id gnat_formal; - Node_Id gnat_actual; - tree gnu_actual_list = NULL_TREE; - tree gnu_name_list = NULL_TREE; - tree gnu_before_list = NULL_TREE; - tree gnu_after_list = NULL_TREE; - tree gnu_subprog_call; - - switch (Nkind (Name (gnat_node))) - { - case N_Identifier: - case N_Operator_Symbol: - case N_Expanded_Name: - case N_Attribute_Reference: - if (Is_Eliminated (Entity (Name (gnat_node)))) - Eliminate_Error_Msg (gnat_node, Entity (Name (gnat_node))); - } - - gcc_assert (TREE_CODE (gnu_subprog_type) == FUNCTION_TYPE); - - /* If we are calling a stubbed function, make this into a raise of - Program_Error. Elaborate all our args first. */ - if (TREE_CODE (gnu_subprog_node) == FUNCTION_DECL - && DECL_STUBBED_P (gnu_subprog_node)) - { - for (gnat_actual = First_Actual (gnat_node); - Present (gnat_actual); - gnat_actual = Next_Actual (gnat_actual)) - add_stmt (gnat_to_gnu (gnat_actual)); - - { - tree call_expr - = build_call_raise (PE_Stubbed_Subprogram_Called, gnat_node, - N_Raise_Program_Error); - - if (Nkind (gnat_node) == N_Function_Call && !gnu_target) - { - *gnu_result_type_p = TREE_TYPE (gnu_subprog_type); - return build1 (NULL_EXPR, *gnu_result_type_p, call_expr); - } - else - return call_expr; - } - } - - /* If we are calling by supplying a pointer to a target, set up that - pointer as the first argument. Use GNU_TARGET if one was passed; - otherwise, make a target by building a variable of the maximum size - of the type. */ - if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type)) - { - tree gnu_real_ret_type - = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (gnu_subprog_type))); - - if (!gnu_target) - { - tree gnu_obj_type - = maybe_pad_type (gnu_real_ret_type, - max_size (TYPE_SIZE (gnu_real_ret_type), true), - 0, Etype (Name (gnat_node)), "PAD", false, - false, false); - - /* ??? We may be about to create a static temporary if we happen to - be at the global binding level. That's a regression from what - the 3.x back-end would generate in the same situation, but we - don't have a mechanism in Gigi for creating automatic variables - in the elaboration routines. */ - gnu_target - = create_var_decl (create_tmp_var_name ("LR"), NULL, gnu_obj_type, - NULL, false, false, false, false, NULL, - gnat_node); - } - - gnu_actual_list - = tree_cons (NULL_TREE, - build_unary_op (ADDR_EXPR, NULL_TREE, - unchecked_convert (gnu_real_ret_type, - gnu_target, - false)), - NULL_TREE); - - } - - /* The only way we can be making a call via an access type is if Name is an - explicit dereference. In that case, get the list of formal args from the - type the access type is pointing to. Otherwise, get the formals from - entity being called. */ - if (Nkind (Name (gnat_node)) == N_Explicit_Dereference) - gnat_formal = First_Formal_With_Extras (Etype (Name (gnat_node))); - else if (Nkind (Name (gnat_node)) == N_Attribute_Reference) - /* Assume here that this must be 'Elab_Body or 'Elab_Spec. */ - gnat_formal = 0; - else - gnat_formal = First_Formal_With_Extras (Entity (Name (gnat_node))); - - /* Create the list of the actual parameters as GCC expects it, namely a chain - of TREE_LIST nodes in which the TREE_VALUE field of each node is a - parameter-expression and the TREE_PURPOSE field is null. Skip Out - parameters not passed by reference and don't need to be copied in. */ - for (gnat_actual = First_Actual (gnat_node); - Present (gnat_actual); - gnat_formal = Next_Formal_With_Extras (gnat_formal), - gnat_actual = Next_Actual (gnat_actual)) - { - tree gnu_formal - = (present_gnu_tree (gnat_formal) - ? get_gnu_tree (gnat_formal) : NULL_TREE); - tree gnu_formal_type = gnat_to_gnu_type (Etype (gnat_formal)); - /* We must suppress conversions that can cause the creation of a - temporary in the Out or In Out case because we need the real - object in this case, either to pass its address if it's passed - by reference or as target of the back copy done after the call - if it uses the copy-in copy-out mechanism. We do it in the In - case too, except for an unchecked conversion because it alone - can cause the actual to be misaligned and the addressability - test is applied to the real object. */ - bool suppress_type_conversion - = ((Nkind (gnat_actual) == N_Unchecked_Type_Conversion - && Ekind (gnat_formal) != E_In_Parameter) - || (Nkind (gnat_actual) == N_Type_Conversion - && Is_Composite_Type (Underlying_Type (Etype (gnat_formal))))); - Node_Id gnat_name = (suppress_type_conversion - ? Expression (gnat_actual) : gnat_actual); - tree gnu_name = gnat_to_gnu (gnat_name), gnu_name_type; - tree gnu_actual; - - /* If it's possible we may need to use this expression twice, make sure - that any side-effects are handled via SAVE_EXPRs. Likewise if we need - to force side-effects before the call. - ??? This is more conservative than we need since we don't need to do - this for pass-by-ref with no conversion. */ - if (Ekind (gnat_formal) != E_In_Parameter) - gnu_name = gnat_stabilize_reference (gnu_name, true); - - /* If we are passing a non-addressable parameter by reference, pass the - address of a copy. In the Out or In Out case, set up to copy back - out after the call. */ - if (gnu_formal - && (DECL_BY_REF_P (gnu_formal) - || (TREE_CODE (gnu_formal) == PARM_DECL - && (DECL_BY_COMPONENT_PTR_P (gnu_formal) - || (DECL_BY_DESCRIPTOR_P (gnu_formal))))) - && (gnu_name_type = gnat_to_gnu_type (Etype (gnat_name))) - && !addressable_p (gnu_name, gnu_name_type)) - { - tree gnu_copy = gnu_name, gnu_temp; - - /* If the type is by_reference, a copy is not allowed. */ - if (Is_By_Reference_Type (Etype (gnat_formal))) - post_error - ("misaligned actual cannot be passed by reference", gnat_actual); - - /* For users of Starlet we issue a warning because the - interface apparently assumes that by-ref parameters - outlive the procedure invocation. The code still - will not work as intended, but we cannot do much - better since other low-level parts of the back-end - would allocate temporaries at will because of the - misalignment if we did not do so here. */ - else if (Is_Valued_Procedure (Entity (Name (gnat_node)))) - { - post_error - ("?possible violation of implicit assumption", gnat_actual); - post_error_ne - ("?made by pragma Import_Valued_Procedure on &", gnat_actual, - Entity (Name (gnat_node))); - post_error_ne ("?because of misalignment of &", gnat_actual, - gnat_formal); - } - - /* Remove any unpadding from the object and reset the copy. */ - if (TREE_CODE (gnu_name) == COMPONENT_REF - && ((TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_name, 0))) - == RECORD_TYPE) - && (TYPE_IS_PADDING_P - (TREE_TYPE (TREE_OPERAND (gnu_name, 0)))))) - gnu_name = gnu_copy = TREE_OPERAND (gnu_name, 0); - - /* Otherwise convert to the nominal type of the object if it's - a record type. There are several cases in which we need to - make the temporary using this type instead of the actual type - of the object if they are distinct, because the expectations - of the callee would otherwise not be met: - - if it's a justified modular type, - - if the actual type is a smaller packable version of it. */ - else if (TREE_CODE (gnu_name_type) == RECORD_TYPE - && (TYPE_JUSTIFIED_MODULAR_P (gnu_name_type) - || smaller_packable_type_p (TREE_TYPE (gnu_name), - gnu_name_type))) - gnu_name = convert (gnu_name_type, gnu_name); - - /* Make a SAVE_EXPR to both properly account for potential side - effects and handle the creation of a temporary copy. Special - code in gnat_gimplify_expr ensures that the same temporary is - used as the object and copied back after the call if needed. */ - gnu_name = build1 (SAVE_EXPR, TREE_TYPE (gnu_name), gnu_name); - TREE_SIDE_EFFECTS (gnu_name) = 1; - - /* Set up to move the copy back to the original. */ - if (Ekind (gnat_formal) != E_In_Parameter) - { - gnu_temp = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_copy, - gnu_name); - set_expr_location_from_node (gnu_temp, gnat_node); - append_to_statement_list (gnu_temp, &gnu_after_list); - } - } - - /* Start from the real object and build the actual. */ - gnu_actual = gnu_name; - - /* If this was a procedure call, we may not have removed any padding. - So do it here for the part we will use as an input, if any. */ - if (Ekind (gnat_formal) != E_Out_Parameter - && TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE - && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual))) - gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)), - gnu_actual); - - /* Do any needed conversions for the actual and make sure that it is - in range of the formal's type. */ - if (suppress_type_conversion) - { - /* Put back the conversion we suppressed above in the computation - of the real object. Note that we treat a conversion between - aggregate types as if it is an unchecked conversion here. */ - gnu_actual - = unchecked_convert (gnat_to_gnu_type (Etype (gnat_actual)), - gnu_actual, - (Nkind (gnat_actual) - == N_Unchecked_Type_Conversion) - && No_Truncation (gnat_actual)); - - if (Ekind (gnat_formal) != E_Out_Parameter - && Do_Range_Check (gnat_actual)) - gnu_actual = emit_range_check (gnu_actual, Etype (gnat_formal)); - } - else - { - if (Ekind (gnat_formal) != E_Out_Parameter - && Do_Range_Check (gnat_actual)) - gnu_actual = emit_range_check (gnu_actual, Etype (gnat_formal)); - - /* We may have suppressed a conversion to the Etype of the actual - since the parent is a procedure call. So put it back here. - ??? We use the reverse order compared to the case above because - of an awkward interaction with the check and actually don't put - back the conversion at all if a check is emitted. This is also - done for the conversion to the formal's type just below. */ - if (TREE_CODE (gnu_actual) != SAVE_EXPR) - gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)), - gnu_actual); - } - - if (TREE_CODE (gnu_actual) != SAVE_EXPR) - gnu_actual = convert (gnu_formal_type, gnu_actual); - - /* Unless this is an In parameter, we must remove any justified modular - building from GNU_NAME to get an lvalue. */ - if (Ekind (gnat_formal) != E_In_Parameter - && TREE_CODE (gnu_name) == CONSTRUCTOR - && TREE_CODE (TREE_TYPE (gnu_name)) == RECORD_TYPE - && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (gnu_name))) - gnu_name = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_name))), - gnu_name); - - /* If we have not saved a GCC object for the formal, it means it is an - Out parameter not passed by reference and that does not need to be - copied in. Otherwise, look at the PARM_DECL to see if it is passed by - reference. */ - if (gnu_formal - && TREE_CODE (gnu_formal) == PARM_DECL - && DECL_BY_REF_P (gnu_formal)) - { - if (Ekind (gnat_formal) != E_In_Parameter) - { - /* In Out or Out parameters passed by reference don't use the - copy-in copy-out mechanism so the address of the real object - must be passed to the function. */ - gnu_actual = gnu_name; - - /* If we have a padded type, be sure we've removed padding. */ - if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE - && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual)) - && TREE_CODE (gnu_actual) != SAVE_EXPR) - gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)), - gnu_actual); - - /* If we have the constructed subtype of an aliased object - with an unconstrained nominal subtype, the type of the - actual includes the template, although it is formally - constrained. So we need to convert it back to the real - constructed subtype to retrieve the constrained part - and takes its address. */ - if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE - && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (gnu_actual)) - && TREE_CODE (gnu_actual) != SAVE_EXPR - && Is_Constr_Subt_For_UN_Aliased (Etype (gnat_actual)) - && Is_Array_Type (Etype (gnat_actual))) - gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)), - gnu_actual); - } - - /* The symmetry of the paths to the type of an entity is broken here - since arguments don't know that they will be passed by ref. */ - gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal)); - gnu_actual = build_unary_op (ADDR_EXPR, gnu_formal_type, gnu_actual); - } - else if (gnu_formal - && TREE_CODE (gnu_formal) == PARM_DECL - && DECL_BY_COMPONENT_PTR_P (gnu_formal)) - { - gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal)); - gnu_actual = maybe_implicit_deref (gnu_actual); - gnu_actual = maybe_unconstrained_array (gnu_actual); - - if (TREE_CODE (gnu_formal_type) == RECORD_TYPE - && TYPE_IS_PADDING_P (gnu_formal_type)) - { - gnu_formal_type = TREE_TYPE (TYPE_FIELDS (gnu_formal_type)); - gnu_actual = convert (gnu_formal_type, gnu_actual); - } - - /* Take the address of the object and convert to the proper pointer - type. We'd like to actually compute the address of the beginning - of the array using an ADDR_EXPR of an ARRAY_REF, but there's a - possibility that the ARRAY_REF might return a constant and we'd be - getting the wrong address. Neither approach is exactly correct, - but this is the most likely to work in all cases. */ - gnu_actual = convert (gnu_formal_type, - build_unary_op (ADDR_EXPR, NULL_TREE, - gnu_actual)); - } - else if (gnu_formal - && TREE_CODE (gnu_formal) == PARM_DECL - && DECL_BY_DESCRIPTOR_P (gnu_formal)) - { - /* If arg is 'Null_Parameter, pass zero descriptor. */ - if ((TREE_CODE (gnu_actual) == INDIRECT_REF - || TREE_CODE (gnu_actual) == UNCONSTRAINED_ARRAY_REF) - && TREE_PRIVATE (gnu_actual)) - gnu_actual = convert (DECL_ARG_TYPE (get_gnu_tree (gnat_formal)), - integer_zero_node); - else - gnu_actual = build_unary_op (ADDR_EXPR, NULL_TREE, - fill_vms_descriptor (gnu_actual, - gnat_formal, - gnat_actual)); - } - else - { - tree gnu_actual_size = TYPE_SIZE (TREE_TYPE (gnu_actual)); - - if (Ekind (gnat_formal) != E_In_Parameter) - gnu_name_list = tree_cons (NULL_TREE, gnu_name, gnu_name_list); - - if (!gnu_formal || TREE_CODE (gnu_formal) != PARM_DECL) - continue; - - /* If this is 'Null_Parameter, pass a zero even though we are - dereferencing it. */ - else if (TREE_CODE (gnu_actual) == INDIRECT_REF - && TREE_PRIVATE (gnu_actual) - && host_integerp (gnu_actual_size, 1) - && 0 >= compare_tree_int (gnu_actual_size, - BITS_PER_WORD)) - gnu_actual - = unchecked_convert (DECL_ARG_TYPE (gnu_formal), - convert (gnat_type_for_size - (tree_low_cst (gnu_actual_size, 1), - 1), - integer_zero_node), - false); - else - gnu_actual = convert (DECL_ARG_TYPE (gnu_formal), gnu_actual); - } - - gnu_actual_list = tree_cons (NULL_TREE, gnu_actual, gnu_actual_list); - } - - gnu_subprog_call = build_call_list (TREE_TYPE (gnu_subprog_type), - gnu_subprog_addr, - nreverse (gnu_actual_list)); - set_expr_location_from_node (gnu_subprog_call, gnat_node); - - /* If we return by passing a target, the result is the target after the - call. We must not emit the call directly here because this might be - evaluated as part of an expression with conditions to control whether - the call should be emitted or not. */ - if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type)) - { - /* Conceptually, what we need is a COMPOUND_EXPR with the call followed - by the target object converted to the proper type. Doing so would - potentially be very inefficient, however, as this expression might - end up wrapped into an outer SAVE_EXPR later on, which would incur a - pointless temporary copy of the whole object. - - What we do instead is build a COMPOUND_EXPR returning the address of - the target, and then dereference. Wrapping the COMPOUND_EXPR into a - SAVE_EXPR later on then only incurs a pointer copy. */ - - tree gnu_result_type - = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (gnu_subprog_type))); - - /* Build and return - (result_type) *[gnu_subprog_call (&gnu_target, ...), &gnu_target] */ - - tree gnu_target_address - = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_target); - set_expr_location_from_node (gnu_target_address, gnat_node); - - gnu_result - = build2 (COMPOUND_EXPR, TREE_TYPE (gnu_target_address), - gnu_subprog_call, gnu_target_address); - - gnu_result - = unchecked_convert (gnu_result_type, - build_unary_op (INDIRECT_REF, NULL_TREE, - gnu_result), - false); - - *gnu_result_type_p = gnu_result_type; - return gnu_result; - } - - /* If it is a function call, the result is the call expression unless - a target is specified, in which case we copy the result into the target - and return the assignment statement. */ - else if (Nkind (gnat_node) == N_Function_Call) - { - gnu_result = gnu_subprog_call; - - /* If the function returns an unconstrained array or by reference, - we have to de-dereference the pointer. */ - if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type) - || TYPE_RETURNS_BY_REF_P (gnu_subprog_type)) - gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result); - - if (gnu_target) - gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE, - gnu_target, gnu_result); - else - *gnu_result_type_p = get_unpadded_type (Etype (gnat_node)); - - return gnu_result; - } - - /* If this is the case where the GNAT tree contains a procedure call - but the Ada procedure has copy in copy out parameters, the special - parameter passing mechanism must be used. */ - else if (TYPE_CI_CO_LIST (gnu_subprog_type) != NULL_TREE) - { - /* List of FIELD_DECLs associated with the PARM_DECLs of the copy - in copy out parameters. */ - tree scalar_return_list = TYPE_CI_CO_LIST (gnu_subprog_type); - int length = list_length (scalar_return_list); - - if (length > 1) - { - tree gnu_name; - - gnu_subprog_call = save_expr (gnu_subprog_call); - gnu_name_list = nreverse (gnu_name_list); - - /* If any of the names had side-effects, ensure they are all - evaluated before the call. */ - for (gnu_name = gnu_name_list; gnu_name; - gnu_name = TREE_CHAIN (gnu_name)) - if (TREE_SIDE_EFFECTS (TREE_VALUE (gnu_name))) - append_to_statement_list (TREE_VALUE (gnu_name), - &gnu_before_list); - } - - if (Nkind (Name (gnat_node)) == N_Explicit_Dereference) - gnat_formal = First_Formal_With_Extras (Etype (Name (gnat_node))); - else - gnat_formal = First_Formal_With_Extras (Entity (Name (gnat_node))); - - for (gnat_actual = First_Actual (gnat_node); - Present (gnat_actual); - gnat_formal = Next_Formal_With_Extras (gnat_formal), - gnat_actual = Next_Actual (gnat_actual)) - /* If we are dealing with a copy in copy out parameter, we must - retrieve its value from the record returned in the call. */ - if (!(present_gnu_tree (gnat_formal) - && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL - && (DECL_BY_REF_P (get_gnu_tree (gnat_formal)) - || (TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL - && ((DECL_BY_COMPONENT_PTR_P (get_gnu_tree (gnat_formal)) - || (DECL_BY_DESCRIPTOR_P - (get_gnu_tree (gnat_formal)))))))) - && Ekind (gnat_formal) != E_In_Parameter) - { - /* Get the value to assign to this Out or In Out parameter. It is - either the result of the function if there is only a single such - parameter or the appropriate field from the record returned. */ - tree gnu_result - = length == 1 ? gnu_subprog_call - : build_component_ref (gnu_subprog_call, NULL_TREE, - TREE_PURPOSE (scalar_return_list), - false); - - /* If the actual is a conversion, get the inner expression, which - will be the real destination, and convert the result to the - type of the actual parameter. */ - tree gnu_actual - = maybe_unconstrained_array (TREE_VALUE (gnu_name_list)); - - /* If the result is a padded type, remove the padding. */ - if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE - && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result))) - gnu_result = convert (TREE_TYPE (TYPE_FIELDS - (TREE_TYPE (gnu_result))), - gnu_result); - - /* If the actual is a type conversion, the real target object is - denoted by the inner Expression and we need to convert the - result to the associated type. - We also need to convert our gnu assignment target to this type - if the corresponding GNU_NAME was constructed from the GNAT - conversion node and not from the inner Expression. */ - if (Nkind (gnat_actual) == N_Type_Conversion) - { - gnu_result - = convert_with_check - (Etype (Expression (gnat_actual)), gnu_result, - Do_Overflow_Check (gnat_actual), - Do_Range_Check (Expression (gnat_actual)), - Float_Truncate (gnat_actual)); - - if (!Is_Composite_Type (Underlying_Type (Etype (gnat_formal)))) - gnu_actual = convert (TREE_TYPE (gnu_result), gnu_actual); - } - - /* Unchecked conversions as actuals for Out parameters are not - allowed in user code because they are not variables, but do - occur in front-end expansions. The associated GNU_NAME is - always obtained from the inner expression in such cases. */ - else if (Nkind (gnat_actual) == N_Unchecked_Type_Conversion) - gnu_result = unchecked_convert (TREE_TYPE (gnu_actual), - gnu_result, - No_Truncation (gnat_actual)); - else - { - if (Do_Range_Check (gnat_actual)) - gnu_result = emit_range_check (gnu_result, - Etype (gnat_actual)); - - if (!(!TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual))) - && TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_result))))) - gnu_result = convert (TREE_TYPE (gnu_actual), gnu_result); - } - - gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE, - gnu_actual, gnu_result); - set_expr_location_from_node (gnu_result, gnat_node); - append_to_statement_list (gnu_result, &gnu_before_list); - scalar_return_list = TREE_CHAIN (scalar_return_list); - gnu_name_list = TREE_CHAIN (gnu_name_list); - } - } - else - append_to_statement_list (gnu_subprog_call, &gnu_before_list); - - append_to_statement_list (gnu_after_list, &gnu_before_list); - return gnu_before_list; -} - -/* Subroutine of gnat_to_gnu to translate gnat_node, an - N_Handled_Sequence_Of_Statements, to a GCC tree, which is returned. */ - -static tree -Handled_Sequence_Of_Statements_to_gnu (Node_Id gnat_node) -{ - tree gnu_jmpsave_decl = NULL_TREE; - tree gnu_jmpbuf_decl = NULL_TREE; - /* If just annotating, ignore all EH and cleanups. */ - bool gcc_zcx = (!type_annotate_only - && Present (Exception_Handlers (gnat_node)) - && Exception_Mechanism == Back_End_Exceptions); - bool setjmp_longjmp - = (!type_annotate_only && Present (Exception_Handlers (gnat_node)) - && Exception_Mechanism == Setjmp_Longjmp); - bool at_end = !type_annotate_only && Present (At_End_Proc (gnat_node)); - bool binding_for_block = (at_end || gcc_zcx || setjmp_longjmp); - tree gnu_inner_block; /* The statement(s) for the block itself. */ - tree gnu_result; - tree gnu_expr; - Node_Id gnat_temp; - - /* The GCC exception handling mechanism can handle both ZCX and SJLJ schemes - and we have our own SJLJ mechanism. To call the GCC mechanism, we call - add_cleanup, and when we leave the binding, end_stmt_group will create - the TRY_FINALLY_EXPR. - - ??? The region level calls down there have been specifically put in place - for a ZCX context and currently the order in which things are emitted - (region/handlers) is different from the SJLJ case. Instead of putting - other calls with different conditions at other places for the SJLJ case, - it seems cleaner to reorder things for the SJLJ case and generalize the - condition to make it not ZCX specific. - - If there are any exceptions or cleanup processing involved, we need an - outer statement group (for Setjmp_Longjmp) and binding level. */ - if (binding_for_block) - { - start_stmt_group (); - gnat_pushlevel (); - } - - /* If using setjmp_longjmp, make the variables for the setjmp buffer and save - area for address of previous buffer. Do this first since we need to have - the setjmp buf known for any decls in this block. */ - if (setjmp_longjmp) - { - gnu_jmpsave_decl = create_var_decl (get_identifier ("JMPBUF_SAVE"), - NULL_TREE, jmpbuf_ptr_type, - build_call_0_expr (get_jmpbuf_decl), - false, false, false, false, NULL, - gnat_node); - DECL_ARTIFICIAL (gnu_jmpsave_decl) = 1; - - /* The __builtin_setjmp receivers will immediately reinstall it. Now - because of the unstructured form of EH used by setjmp_longjmp, there - might be forward edges going to __builtin_setjmp receivers on which - it is uninitialized, although they will never be actually taken. */ - TREE_NO_WARNING (gnu_jmpsave_decl) = 1; - gnu_jmpbuf_decl = create_var_decl (get_identifier ("JMP_BUF"), - NULL_TREE, jmpbuf_type, - NULL_TREE, false, false, false, false, - NULL, gnat_node); - DECL_ARTIFICIAL (gnu_jmpbuf_decl) = 1; - - set_block_jmpbuf_decl (gnu_jmpbuf_decl); - - /* When we exit this block, restore the saved value. */ - add_cleanup (build_call_1_expr (set_jmpbuf_decl, gnu_jmpsave_decl), - End_Label (gnat_node)); - } - - /* If we are to call a function when exiting this block, add a cleanup - to the binding level we made above. Note that add_cleanup is FIFO - so we must register this cleanup after the EH cleanup just above. */ - if (at_end) - add_cleanup (build_call_0_expr (gnat_to_gnu (At_End_Proc (gnat_node))), - End_Label (gnat_node)); - - /* Now build the tree for the declarations and statements inside this block. - If this is SJLJ, set our jmp_buf as the current buffer. */ - start_stmt_group (); - - if (setjmp_longjmp) - add_stmt (build_call_1_expr (set_jmpbuf_decl, - build_unary_op (ADDR_EXPR, NULL_TREE, - gnu_jmpbuf_decl))); - - if (Present (First_Real_Statement (gnat_node))) - process_decls (Statements (gnat_node), Empty, - First_Real_Statement (gnat_node), true, true); - - /* Generate code for each statement in the block. */ - for (gnat_temp = (Present (First_Real_Statement (gnat_node)) - ? First_Real_Statement (gnat_node) - : First (Statements (gnat_node))); - Present (gnat_temp); gnat_temp = Next (gnat_temp)) - add_stmt (gnat_to_gnu (gnat_temp)); - gnu_inner_block = end_stmt_group (); - - /* Now generate code for the two exception models, if either is relevant for - this block. */ - if (setjmp_longjmp) - { - tree *gnu_else_ptr = 0; - tree gnu_handler; - - /* Make a binding level for the exception handling declarations and code - and set up gnu_except_ptr_stack for the handlers to use. */ - start_stmt_group (); - gnat_pushlevel (); - - push_stack (&gnu_except_ptr_stack, NULL_TREE, - create_var_decl (get_identifier ("EXCEPT_PTR"), - NULL_TREE, - build_pointer_type (except_type_node), - build_call_0_expr (get_excptr_decl), false, - false, false, false, NULL, gnat_node)); - - /* Generate code for each handler. The N_Exception_Handler case does the - real work and returns a COND_EXPR for each handler, which we chain - together here. */ - for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node)); - Present (gnat_temp); gnat_temp = Next_Non_Pragma (gnat_temp)) - { - gnu_expr = gnat_to_gnu (gnat_temp); - - /* If this is the first one, set it as the outer one. Otherwise, - point the "else" part of the previous handler to us. Then point - to our "else" part. */ - if (!gnu_else_ptr) - add_stmt (gnu_expr); - else - *gnu_else_ptr = gnu_expr; - - gnu_else_ptr = &COND_EXPR_ELSE (gnu_expr); - } - - /* If none of the exception handlers did anything, re-raise but do not - defer abortion. */ - gnu_expr = build_call_1_expr (raise_nodefer_decl, - TREE_VALUE (gnu_except_ptr_stack)); - set_expr_location_from_node (gnu_expr, gnat_node); - - if (gnu_else_ptr) - *gnu_else_ptr = gnu_expr; - else - add_stmt (gnu_expr); - - /* End the binding level dedicated to the exception handlers and get the - whole statement group. */ - pop_stack (&gnu_except_ptr_stack); - gnat_poplevel (); - gnu_handler = end_stmt_group (); - - /* If the setjmp returns 1, we restore our incoming longjmp value and - then check the handlers. */ - start_stmt_group (); - add_stmt_with_node (build_call_1_expr (set_jmpbuf_decl, - gnu_jmpsave_decl), - gnat_node); - add_stmt (gnu_handler); - gnu_handler = end_stmt_group (); - - /* This block is now "if (setjmp) ... <handlers> else <block>". */ - gnu_result = build3 (COND_EXPR, void_type_node, - (build_call_1_expr - (setjmp_decl, - build_unary_op (ADDR_EXPR, NULL_TREE, - gnu_jmpbuf_decl))), - gnu_handler, gnu_inner_block); - } - else if (gcc_zcx) - { - tree gnu_handlers; - - /* First make a block containing the handlers. */ - start_stmt_group (); - for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node)); - Present (gnat_temp); - gnat_temp = Next_Non_Pragma (gnat_temp)) - add_stmt (gnat_to_gnu (gnat_temp)); - gnu_handlers = end_stmt_group (); - - /* Now make the TRY_CATCH_EXPR for the block. */ - gnu_result = build2 (TRY_CATCH_EXPR, void_type_node, - gnu_inner_block, gnu_handlers); - } - else - gnu_result = gnu_inner_block; - - /* Now close our outer block, if we had to make one. */ - if (binding_for_block) - { - add_stmt (gnu_result); - gnat_poplevel (); - gnu_result = end_stmt_group (); - } - - return gnu_result; -} - -/* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler, - to a GCC tree, which is returned. This is the variant for Setjmp_Longjmp - exception handling. */ - -static tree -Exception_Handler_to_gnu_sjlj (Node_Id gnat_node) -{ - /* Unless this is "Others" or the special "Non-Ada" exception for Ada, make - an "if" statement to select the proper exceptions. For "Others", exclude - exceptions where Handled_By_Others is nonzero unless the All_Others flag - is set. For "Non-ada", accept an exception if "Lang" is 'V'. */ - tree gnu_choice = integer_zero_node; - tree gnu_body = build_stmt_group (Statements (gnat_node), false); - Node_Id gnat_temp; - - for (gnat_temp = First (Exception_Choices (gnat_node)); - gnat_temp; gnat_temp = Next (gnat_temp)) - { - tree this_choice; - - if (Nkind (gnat_temp) == N_Others_Choice) - { - if (All_Others (gnat_temp)) - this_choice = integer_one_node; - else - this_choice - = build_binary_op - (EQ_EXPR, integer_type_node, - convert - (integer_type_node, - build_component_ref - (build_unary_op - (INDIRECT_REF, NULL_TREE, - TREE_VALUE (gnu_except_ptr_stack)), - get_identifier ("not_handled_by_others"), NULL_TREE, - false)), - integer_zero_node); - } - - else if (Nkind (gnat_temp) == N_Identifier - || Nkind (gnat_temp) == N_Expanded_Name) - { - Entity_Id gnat_ex_id = Entity (gnat_temp); - tree gnu_expr; - - /* Exception may be a renaming. Recover original exception which is - the one elaborated and registered. */ - if (Present (Renamed_Object (gnat_ex_id))) - gnat_ex_id = Renamed_Object (gnat_ex_id); - - gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, 0); - - this_choice - = build_binary_op - (EQ_EXPR, integer_type_node, TREE_VALUE (gnu_except_ptr_stack), - convert (TREE_TYPE (TREE_VALUE (gnu_except_ptr_stack)), - build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr))); - - /* If this is the distinguished exception "Non_Ada_Error" (and we are - in VMS mode), also allow a non-Ada exception (a VMS condition) t - match. */ - if (Is_Non_Ada_Error (Entity (gnat_temp))) - { - tree gnu_comp - = build_component_ref - (build_unary_op (INDIRECT_REF, NULL_TREE, - TREE_VALUE (gnu_except_ptr_stack)), - get_identifier ("lang"), NULL_TREE, false); - - this_choice - = build_binary_op - (TRUTH_ORIF_EXPR, integer_type_node, - build_binary_op (EQ_EXPR, integer_type_node, gnu_comp, - build_int_cst (TREE_TYPE (gnu_comp), 'V')), - this_choice); - } - } - else - gcc_unreachable (); - - gnu_choice = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node, - gnu_choice, this_choice); - } - - return build3 (COND_EXPR, void_type_node, gnu_choice, gnu_body, NULL_TREE); -} - -/* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler, - to a GCC tree, which is returned. This is the variant for ZCX. */ - -static tree -Exception_Handler_to_gnu_zcx (Node_Id gnat_node) -{ - tree gnu_etypes_list = NULL_TREE; - tree gnu_expr; - tree gnu_etype; - tree gnu_current_exc_ptr; - tree gnu_incoming_exc_ptr; - Node_Id gnat_temp; - - /* We build a TREE_LIST of nodes representing what exception types this - handler can catch, with special cases for others and all others cases. - - Each exception type is actually identified by a pointer to the exception - id, or to a dummy object for "others" and "all others". - - Care should be taken to ensure that the control flow impact of "others" - and "all others" is known to GCC. lang_eh_type_covers is doing the trick - currently. */ - for (gnat_temp = First (Exception_Choices (gnat_node)); - gnat_temp; gnat_temp = Next (gnat_temp)) - { - if (Nkind (gnat_temp) == N_Others_Choice) - { - tree gnu_expr - = All_Others (gnat_temp) ? all_others_decl : others_decl; - - gnu_etype - = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr); - } - else if (Nkind (gnat_temp) == N_Identifier - || Nkind (gnat_temp) == N_Expanded_Name) - { - Entity_Id gnat_ex_id = Entity (gnat_temp); - - /* Exception may be a renaming. Recover original exception which is - the one elaborated and registered. */ - if (Present (Renamed_Object (gnat_ex_id))) - gnat_ex_id = Renamed_Object (gnat_ex_id); - - gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, 0); - gnu_etype = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr); - - /* The Non_Ada_Error case for VMS exceptions is handled - by the personality routine. */ - } - else - gcc_unreachable (); - - /* The GCC interface expects NULL to be passed for catch all handlers, so - it would be quite tempting to set gnu_etypes_list to NULL if gnu_etype - is integer_zero_node. It would not work, however, because GCC's - notion of "catch all" is stronger than our notion of "others". Until - we correctly use the cleanup interface as well, doing that would - prevent the "all others" handlers from being seen, because nothing - can be caught beyond a catch all from GCC's point of view. */ - gnu_etypes_list = tree_cons (NULL_TREE, gnu_etype, gnu_etypes_list); - } - - start_stmt_group (); - gnat_pushlevel (); - - /* Expand a call to the begin_handler hook at the beginning of the handler, - and arrange for a call to the end_handler hook to occur on every possible - exit path. - - The hooks expect a pointer to the low level occurrence. This is required - for our stack management scheme because a raise inside the handler pushes - a new occurrence on top of the stack, which means that this top does not - necessarily match the occurrence this handler was dealing with. - - The EXC_PTR_EXPR object references the exception occurrence being - propagated. Upon handler entry, this is the exception for which the - handler is triggered. This might not be the case upon handler exit, - however, as we might have a new occurrence propagated by the handler's - body, and the end_handler hook called as a cleanup in this context. - - We use a local variable to retrieve the incoming value at handler entry - time, and reuse it to feed the end_handler hook's argument at exit. */ - gnu_current_exc_ptr = build0 (EXC_PTR_EXPR, ptr_type_node); - gnu_incoming_exc_ptr = create_var_decl (get_identifier ("EXPTR"), NULL_TREE, - ptr_type_node, gnu_current_exc_ptr, - false, false, false, false, NULL, - gnat_node); - - add_stmt_with_node (build_call_1_expr (begin_handler_decl, - gnu_incoming_exc_ptr), - gnat_node); - /* ??? We don't seem to have an End_Label at hand to set the location. */ - add_cleanup (build_call_1_expr (end_handler_decl, gnu_incoming_exc_ptr), - Empty); - add_stmt_list (Statements (gnat_node)); - gnat_poplevel (); - - return build2 (CATCH_EXPR, void_type_node, gnu_etypes_list, - end_stmt_group ()); -} - -/* Subroutine of gnat_to_gnu to generate code for an N_Compilation unit. */ - -static void -Compilation_Unit_to_gnu (Node_Id gnat_node) -{ - /* Make the decl for the elaboration procedure. */ - bool body_p = (Defining_Entity (Unit (gnat_node)), - Nkind (Unit (gnat_node)) == N_Package_Body - || Nkind (Unit (gnat_node)) == N_Subprogram_Body); - Entity_Id gnat_unit_entity = Defining_Entity (Unit (gnat_node)); - tree gnu_elab_proc_decl - = create_subprog_decl - (create_concat_name (gnat_unit_entity, - body_p ? "elabb" : "elabs"), - NULL_TREE, void_ftype, NULL_TREE, false, true, false, NULL, - gnat_unit_entity); - struct elab_info *info; - - push_stack (&gnu_elab_proc_stack, NULL_TREE, gnu_elab_proc_decl); - - DECL_ELABORATION_PROC_P (gnu_elab_proc_decl) = 1; - allocate_struct_function (gnu_elab_proc_decl, false); - Sloc_to_locus (Sloc (gnat_unit_entity), &cfun->function_end_locus); - set_cfun (NULL); - - /* For a body, first process the spec if there is one. */ - if (Nkind (Unit (gnat_node)) == N_Package_Body - || (Nkind (Unit (gnat_node)) == N_Subprogram_Body - && !Acts_As_Spec (gnat_node))) - { - add_stmt (gnat_to_gnu (Library_Unit (gnat_node))); - finalize_from_with_types (); - } - - process_inlined_subprograms (gnat_node); - - if (type_annotate_only && gnat_node == Cunit (Main_Unit)) - { - elaborate_all_entities (gnat_node); - - if (Nkind (Unit (gnat_node)) == N_Subprogram_Declaration - || Nkind (Unit (gnat_node)) == N_Generic_Package_Declaration - || Nkind (Unit (gnat_node)) == N_Generic_Subprogram_Declaration) - return; - } - - process_decls (Declarations (Aux_Decls_Node (gnat_node)), Empty, Empty, - true, true); - add_stmt (gnat_to_gnu (Unit (gnat_node))); - - /* Process any pragmas and actions following the unit. */ - add_stmt_list (Pragmas_After (Aux_Decls_Node (gnat_node))); - add_stmt_list (Actions (Aux_Decls_Node (gnat_node))); - finalize_from_with_types (); - - /* Save away what we've made so far and record this potential elaboration - procedure. */ - info = (struct elab_info *) ggc_alloc (sizeof (struct elab_info)); - set_current_block_context (gnu_elab_proc_decl); - gnat_poplevel (); - DECL_SAVED_TREE (gnu_elab_proc_decl) = end_stmt_group (); - info->next = elab_info_list; - info->elab_proc = gnu_elab_proc_decl; - info->gnat_node = gnat_node; - elab_info_list = info; - - /* Generate elaboration code for this unit, if necessary, and say whether - we did or not. */ - pop_stack (&gnu_elab_proc_stack); - - /* Invalidate the global renaming pointers. This is necessary because - stabilization of the renamed entities may create SAVE_EXPRs which - have been tied to a specific elaboration routine just above. */ - invalidate_global_renaming_pointers (); -} - -/* This function is the driver of the GNAT to GCC tree transformation - process. It is the entry point of the tree transformer. GNAT_NODE is the - root of some GNAT tree. Return the root of the corresponding GCC tree. - If this is an expression, return the GCC equivalent of the expression. If - it is a statement, return the statement. In the case when called for a - statement, it may also add statements to the current statement group, in - which case anything it returns is to be interpreted as occurring after - anything `it already added. */ - -tree -gnat_to_gnu (Node_Id gnat_node) -{ - bool went_into_elab_proc = false; - tree gnu_result = error_mark_node; /* Default to no value. */ - tree gnu_result_type = void_type_node; - tree gnu_expr; - tree gnu_lhs, gnu_rhs; - Node_Id gnat_temp; - - /* Save node number for error message and set location information. */ - error_gnat_node = gnat_node; - Sloc_to_locus (Sloc (gnat_node), &input_location); - - if (type_annotate_only - && IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call)) - return alloc_stmt_list (); - - /* If this node is a non-static subexpression and we are only - annotating types, make this into a NULL_EXPR. */ - if (type_annotate_only - && IN (Nkind (gnat_node), N_Subexpr) - && Nkind (gnat_node) != N_Identifier - && !Compile_Time_Known_Value (gnat_node)) - return build1 (NULL_EXPR, get_unpadded_type (Etype (gnat_node)), - build_call_raise (CE_Range_Check_Failed, gnat_node, - N_Raise_Constraint_Error)); - - /* If this is a Statement and we are at top level, it must be part of the - elaboration procedure, so mark us as being in that procedure and push our - context. - - If we are in the elaboration procedure, check if we are violating a - No_Elaboration_Code restriction by having a statement there. */ - if ((IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call) - && Nkind (gnat_node) != N_Null_Statement) - || Nkind (gnat_node) == N_Procedure_Call_Statement - || Nkind (gnat_node) == N_Label - || Nkind (gnat_node) == N_Implicit_Label_Declaration - || Nkind (gnat_node) == N_Handled_Sequence_Of_Statements - || ((Nkind (gnat_node) == N_Raise_Constraint_Error - || Nkind (gnat_node) == N_Raise_Storage_Error - || Nkind (gnat_node) == N_Raise_Program_Error) - && (Ekind (Etype (gnat_node)) == E_Void))) - { - if (!current_function_decl) - { - current_function_decl = TREE_VALUE (gnu_elab_proc_stack); - start_stmt_group (); - gnat_pushlevel (); - went_into_elab_proc = true; - } - - /* Don't check for a possible No_Elaboration_Code restriction violation - on N_Handled_Sequence_Of_Statements, as we want to signal an error on - every nested real statement instead. This also avoids triggering - spurious errors on dummy (empty) sequences created by the front-end - for package bodies in some cases. */ - - if (current_function_decl == TREE_VALUE (gnu_elab_proc_stack) - && Nkind (gnat_node) != N_Handled_Sequence_Of_Statements) - Check_Elaboration_Code_Allowed (gnat_node); - } - - switch (Nkind (gnat_node)) - { - /********************************/ - /* Chapter 2: Lexical Elements: */ - /********************************/ - - case N_Identifier: - case N_Expanded_Name: - case N_Operator_Symbol: - case N_Defining_Identifier: - gnu_result = Identifier_to_gnu (gnat_node, &gnu_result_type); - break; - - case N_Integer_Literal: - { - tree gnu_type; - - /* Get the type of the result, looking inside any padding and - justified modular types. Then get the value in that type. */ - gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node)); - - if (TREE_CODE (gnu_type) == RECORD_TYPE - && TYPE_JUSTIFIED_MODULAR_P (gnu_type)) - gnu_type = TREE_TYPE (TYPE_FIELDS (gnu_type)); - - gnu_result = UI_To_gnu (Intval (gnat_node), gnu_type); - - /* If the result overflows (meaning it doesn't fit in its base type), - abort. We would like to check that the value is within the range - of the subtype, but that causes problems with subtypes whose usage - will raise Constraint_Error and with biased representation, so - we don't. */ - gcc_assert (!TREE_OVERFLOW (gnu_result)); - } - break; - - case N_Character_Literal: - /* If a Entity is present, it means that this was one of the - literals in a user-defined character type. In that case, - just return the value in the CONST_DECL. Otherwise, use the - character code. In that case, the base type should be an - INTEGER_TYPE, but we won't bother checking for that. */ - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - if (Present (Entity (gnat_node))) - gnu_result = DECL_INITIAL (get_gnu_tree (Entity (gnat_node))); - else - gnu_result - = build_int_cst_type - (gnu_result_type, UI_To_CC (Char_Literal_Value (gnat_node))); - break; - - case N_Real_Literal: - /* If this is of a fixed-point type, the value we want is the - value of the corresponding integer. */ - if (IN (Ekind (Underlying_Type (Etype (gnat_node))), Fixed_Point_Kind)) - { - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - gnu_result = UI_To_gnu (Corresponding_Integer_Value (gnat_node), - gnu_result_type); - gcc_assert (!TREE_OVERFLOW (gnu_result)); - } - - /* We should never see a Vax_Float type literal, since the front end - is supposed to transform these using appropriate conversions */ - else if (Vax_Float (Underlying_Type (Etype (gnat_node)))) - gcc_unreachable (); - - else - { - Ureal ur_realval = Realval (gnat_node); - - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - - /* If the real value is zero, so is the result. Otherwise, - convert it to a machine number if it isn't already. That - forces BASE to 0 or 2 and simplifies the rest of our logic. */ - if (UR_Is_Zero (ur_realval)) - gnu_result = convert (gnu_result_type, integer_zero_node); - else - { - if (!Is_Machine_Number (gnat_node)) - ur_realval - = Machine (Base_Type (Underlying_Type (Etype (gnat_node))), - ur_realval, Round_Even, gnat_node); - - gnu_result - = UI_To_gnu (Numerator (ur_realval), gnu_result_type); - - /* If we have a base of zero, divide by the denominator. - Otherwise, the base must be 2 and we scale the value, which - we know can fit in the mantissa of the type (hence the use - of that type above). */ - if (No (Rbase (ur_realval))) - gnu_result - = build_binary_op (RDIV_EXPR, - get_base_type (gnu_result_type), - gnu_result, - UI_To_gnu (Denominator (ur_realval), - gnu_result_type)); - else - { - REAL_VALUE_TYPE tmp; - - gcc_assert (Rbase (ur_realval) == 2); - real_ldexp (&tmp, &TREE_REAL_CST (gnu_result), - - UI_To_Int (Denominator (ur_realval))); - gnu_result = build_real (gnu_result_type, tmp); - } - } - - /* Now see if we need to negate the result. Do it this way to - properly handle -0. */ - if (UR_Is_Negative (Realval (gnat_node))) - gnu_result - = build_unary_op (NEGATE_EXPR, get_base_type (gnu_result_type), - gnu_result); - } - - break; - - case N_String_Literal: - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - if (TYPE_PRECISION (TREE_TYPE (gnu_result_type)) == HOST_BITS_PER_CHAR) - { - String_Id gnat_string = Strval (gnat_node); - int length = String_Length (gnat_string); - int i; - char *string; - if (length >= ALLOCA_THRESHOLD) - string = XNEWVEC (char, length + 1); /* in case of large strings */ - else - string = (char *) alloca (length + 1); - - /* Build the string with the characters in the literal. Note - that Ada strings are 1-origin. */ - for (i = 0; i < length; i++) - string[i] = Get_String_Char (gnat_string, i + 1); - - /* Put a null at the end of the string in case it's in a context - where GCC will want to treat it as a C string. */ - string[i] = 0; - - gnu_result = build_string (length, string); - - /* Strings in GCC don't normally have types, but we want - this to not be converted to the array type. */ - TREE_TYPE (gnu_result) = gnu_result_type; - - if (length >= ALLOCA_THRESHOLD) /* free if heap-allocated */ - free (string); - } - else - { - /* Build a list consisting of each character, then make - the aggregate. */ - String_Id gnat_string = Strval (gnat_node); - int length = String_Length (gnat_string); - int i; - tree gnu_list = NULL_TREE; - tree gnu_idx = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type)); - - for (i = 0; i < length; i++) - { - gnu_list - = tree_cons (gnu_idx, - build_int_cst (TREE_TYPE (gnu_result_type), - Get_String_Char (gnat_string, - i + 1)), - gnu_list); - - gnu_idx = int_const_binop (PLUS_EXPR, gnu_idx, integer_one_node, - 0); - } - - gnu_result - = gnat_build_constructor (gnu_result_type, nreverse (gnu_list)); - } - break; - - case N_Pragma: - gnu_result = Pragma_to_gnu (gnat_node); - break; - - /**************************************/ - /* Chapter 3: Declarations and Types: */ - /**************************************/ - - case N_Subtype_Declaration: - case N_Full_Type_Declaration: - case N_Incomplete_Type_Declaration: - case N_Private_Type_Declaration: - case N_Private_Extension_Declaration: - case N_Task_Type_Declaration: - process_type (Defining_Entity (gnat_node)); - gnu_result = alloc_stmt_list (); - break; - - case N_Object_Declaration: - case N_Exception_Declaration: - gnat_temp = Defining_Entity (gnat_node); - gnu_result = alloc_stmt_list (); - - /* If we are just annotating types and this object has an unconstrained - or task type, don't elaborate it. */ - if (type_annotate_only - && (((Is_Array_Type (Etype (gnat_temp)) - || Is_Record_Type (Etype (gnat_temp))) - && !Is_Constrained (Etype (gnat_temp))) - || Is_Concurrent_Type (Etype (gnat_temp)))) - break; - - if (Present (Expression (gnat_node)) - && !(Nkind (gnat_node) == N_Object_Declaration - && No_Initialization (gnat_node)) - && (!type_annotate_only - || Compile_Time_Known_Value (Expression (gnat_node)))) - { - gnu_expr = gnat_to_gnu (Expression (gnat_node)); - if (Do_Range_Check (Expression (gnat_node))) - gnu_expr = emit_range_check (gnu_expr, Etype (gnat_temp)); - - /* If this object has its elaboration delayed, we must force - evaluation of GNU_EXPR right now and save it for when the object - is frozen. */ - if (Present (Freeze_Node (gnat_temp))) - { - if ((Is_Public (gnat_temp) || global_bindings_p ()) - && !TREE_CONSTANT (gnu_expr)) - gnu_expr - = create_var_decl (create_concat_name (gnat_temp, "init"), - NULL_TREE, TREE_TYPE (gnu_expr), - gnu_expr, false, Is_Public (gnat_temp), - false, false, NULL, gnat_temp); - else - gnu_expr = maybe_variable (gnu_expr); - - save_gnu_tree (gnat_node, gnu_expr, true); - } - } - else - gnu_expr = NULL_TREE; - - if (type_annotate_only && gnu_expr && TREE_CODE (gnu_expr) == ERROR_MARK) - gnu_expr = NULL_TREE; - - /* If this is a deferred constant with an address clause, we ignore the - full view since the clause is on the partial view and we cannot have - 2 different GCC trees for the object. The only bits of the full view - we will use is the initializer, but it will be directly fetched. */ - if (Ekind(gnat_temp) == E_Constant - && Present (Address_Clause (gnat_temp)) - && Present (Full_View (gnat_temp))) - save_gnu_tree (Full_View (gnat_temp), error_mark_node, true); - - if (No (Freeze_Node (gnat_temp))) - gnat_to_gnu_entity (gnat_temp, gnu_expr, 1); - break; - - case N_Object_Renaming_Declaration: - gnat_temp = Defining_Entity (gnat_node); - - /* Don't do anything if this renaming is handled by the front end or if - we are just annotating types and this object has a composite or task - type, don't elaborate it. We return the result in case it has any - SAVE_EXPRs in it that need to be evaluated here. */ - if (!Is_Renaming_Of_Object (gnat_temp) - && ! (type_annotate_only - && (Is_Array_Type (Etype (gnat_temp)) - || Is_Record_Type (Etype (gnat_temp)) - || Is_Concurrent_Type (Etype (gnat_temp))))) - gnu_result - = gnat_to_gnu_entity (gnat_temp, - gnat_to_gnu (Renamed_Object (gnat_temp)), 1); - else - gnu_result = alloc_stmt_list (); - break; - - case N_Implicit_Label_Declaration: - gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, 1); - gnu_result = alloc_stmt_list (); - break; - - case N_Exception_Renaming_Declaration: - case N_Number_Declaration: - case N_Package_Renaming_Declaration: - case N_Subprogram_Renaming_Declaration: - /* These are fully handled in the front end. */ - gnu_result = alloc_stmt_list (); - break; - - /*************************************/ - /* Chapter 4: Names and Expressions: */ - /*************************************/ - - case N_Explicit_Dereference: - gnu_result = gnat_to_gnu (Prefix (gnat_node)); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result); - break; - - case N_Indexed_Component: - { - tree gnu_array_object = gnat_to_gnu (Prefix (gnat_node)); - tree gnu_type; - int ndim; - int i; - Node_Id *gnat_expr_array; - - gnu_array_object = maybe_implicit_deref (gnu_array_object); - gnu_array_object = maybe_unconstrained_array (gnu_array_object); - - /* If we got a padded type, remove it too. */ - if (TREE_CODE (TREE_TYPE (gnu_array_object)) == RECORD_TYPE - && TYPE_IS_PADDING_P (TREE_TYPE (gnu_array_object))) - gnu_array_object - = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_array_object))), - gnu_array_object); - - gnu_result = gnu_array_object; - - /* First compute the number of dimensions of the array, then - fill the expression array, the order depending on whether - this is a Convention_Fortran array or not. */ - for (ndim = 1, gnu_type = TREE_TYPE (gnu_array_object); - TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE - && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)); - ndim++, gnu_type = TREE_TYPE (gnu_type)) - ; - - gnat_expr_array = (Node_Id *) alloca (ndim * sizeof (Node_Id)); - - if (TYPE_CONVENTION_FORTRAN_P (TREE_TYPE (gnu_array_object))) - for (i = ndim - 1, gnat_temp = First (Expressions (gnat_node)); - i >= 0; - i--, gnat_temp = Next (gnat_temp)) - gnat_expr_array[i] = gnat_temp; - else - for (i = 0, gnat_temp = First (Expressions (gnat_node)); - i < ndim; - i++, gnat_temp = Next (gnat_temp)) - gnat_expr_array[i] = gnat_temp; - - for (i = 0, gnu_type = TREE_TYPE (gnu_array_object); - i < ndim; i++, gnu_type = TREE_TYPE (gnu_type)) - { - gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE); - gnat_temp = gnat_expr_array[i]; - gnu_expr = gnat_to_gnu (gnat_temp); - - if (Do_Range_Check (gnat_temp)) - gnu_expr - = emit_index_check - (gnu_array_object, gnu_expr, - TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))), - TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)))); - - gnu_result = build_binary_op (ARRAY_REF, NULL_TREE, - gnu_result, gnu_expr); - } - } - - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - break; - - case N_Slice: - { - tree gnu_type; - Node_Id gnat_range_node = Discrete_Range (gnat_node); - - gnu_result = gnat_to_gnu (Prefix (gnat_node)); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - - /* Do any implicit dereferences of the prefix and do any needed - range check. */ - gnu_result = maybe_implicit_deref (gnu_result); - gnu_result = maybe_unconstrained_array (gnu_result); - gnu_type = TREE_TYPE (gnu_result); - if (Do_Range_Check (gnat_range_node)) - { - /* Get the bounds of the slice. */ - tree gnu_index_type - = TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_result_type)); - tree gnu_min_expr = TYPE_MIN_VALUE (gnu_index_type); - tree gnu_max_expr = TYPE_MAX_VALUE (gnu_index_type); - /* Get the permitted bounds. */ - tree gnu_base_index_type - = TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)); - tree gnu_base_min_expr = SUBSTITUTE_PLACEHOLDER_IN_EXPR - (TYPE_MIN_VALUE (gnu_base_index_type), gnu_result); - tree gnu_base_max_expr = SUBSTITUTE_PLACEHOLDER_IN_EXPR - (TYPE_MAX_VALUE (gnu_base_index_type), gnu_result); - tree gnu_expr_l, gnu_expr_h, gnu_expr_type; - - gnu_min_expr = protect_multiple_eval (gnu_min_expr); - gnu_max_expr = protect_multiple_eval (gnu_max_expr); - - /* Derive a good type to convert everything to. */ - gnu_expr_type = get_base_type (gnu_index_type); - - /* Test whether the minimum slice value is too small. */ - gnu_expr_l = build_binary_op (LT_EXPR, integer_type_node, - convert (gnu_expr_type, - gnu_min_expr), - convert (gnu_expr_type, - gnu_base_min_expr)); - - /* Test whether the maximum slice value is too large. */ - gnu_expr_h = build_binary_op (GT_EXPR, integer_type_node, - convert (gnu_expr_type, - gnu_max_expr), - convert (gnu_expr_type, - gnu_base_max_expr)); - - /* Build a slice index check that returns the low bound, - assuming the slice is not empty. */ - gnu_expr = emit_check - (build_binary_op (TRUTH_ORIF_EXPR, integer_type_node, - gnu_expr_l, gnu_expr_h), - gnu_min_expr, CE_Index_Check_Failed); - - /* Build a conditional expression that does the index checks and - returns the low bound if the slice is not empty (max >= min), - and returns the naked low bound otherwise (max < min), unless - it is non-constant and the high bound is; this prevents VRP - from inferring bogus ranges on the unlikely path. */ - gnu_expr = fold_build3 (COND_EXPR, gnu_expr_type, - build_binary_op (GE_EXPR, gnu_expr_type, - convert (gnu_expr_type, - gnu_max_expr), - convert (gnu_expr_type, - gnu_min_expr)), - gnu_expr, - TREE_CODE (gnu_min_expr) != INTEGER_CST - && TREE_CODE (gnu_max_expr) == INTEGER_CST - ? gnu_max_expr : gnu_min_expr); - } - else - /* Simply return the naked low bound. */ - gnu_expr = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type)); - - gnu_result = build_binary_op (ARRAY_RANGE_REF, gnu_result_type, - gnu_result, gnu_expr); - } - break; - - case N_Selected_Component: - { - tree gnu_prefix = gnat_to_gnu (Prefix (gnat_node)); - Entity_Id gnat_field = Entity (Selector_Name (gnat_node)); - Entity_Id gnat_pref_type = Etype (Prefix (gnat_node)); - tree gnu_field; - - while (IN (Ekind (gnat_pref_type), Incomplete_Or_Private_Kind) - || IN (Ekind (gnat_pref_type), Access_Kind)) - { - if (IN (Ekind (gnat_pref_type), Incomplete_Or_Private_Kind)) - gnat_pref_type = Underlying_Type (gnat_pref_type); - else if (IN (Ekind (gnat_pref_type), Access_Kind)) - gnat_pref_type = Designated_Type (gnat_pref_type); - } - - gnu_prefix = maybe_implicit_deref (gnu_prefix); - - /* For discriminant references in tagged types always substitute the - corresponding discriminant as the actual selected component. */ - - if (Is_Tagged_Type (gnat_pref_type)) - while (Present (Corresponding_Discriminant (gnat_field))) - gnat_field = Corresponding_Discriminant (gnat_field); - - /* For discriminant references of untagged types always substitute the - corresponding stored discriminant. */ - - else if (Present (Corresponding_Discriminant (gnat_field))) - gnat_field = Original_Record_Component (gnat_field); - - /* Handle extracting the real or imaginary part of a complex. - The real part is the first field and the imaginary the last. */ - - if (TREE_CODE (TREE_TYPE (gnu_prefix)) == COMPLEX_TYPE) - gnu_result = build_unary_op (Present (Next_Entity (gnat_field)) - ? REALPART_EXPR : IMAGPART_EXPR, - NULL_TREE, gnu_prefix); - else - { - gnu_field = gnat_to_gnu_field_decl (gnat_field); - - /* If there are discriminants, the prefix might be - evaluated more than once, which is a problem if it has - side-effects. */ - if (Has_Discriminants (Is_Access_Type (Etype (Prefix (gnat_node))) - ? Designated_Type (Etype - (Prefix (gnat_node))) - : Etype (Prefix (gnat_node)))) - gnu_prefix = gnat_stabilize_reference (gnu_prefix, false); - - gnu_result - = build_component_ref (gnu_prefix, NULL_TREE, gnu_field, - (Nkind (Parent (gnat_node)) - == N_Attribute_Reference)); - } - - gcc_assert (gnu_result); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - } - break; - - case N_Attribute_Reference: - { - /* The attribute designator (like an enumeration value). */ - int attribute = Get_Attribute_Id (Attribute_Name (gnat_node)); - - /* The Elab_Spec and Elab_Body attributes are special in that - Prefix is a unit, not an object with a GCC equivalent. Similarly - for Elaborated, since that variable isn't otherwise known. */ - if (attribute == Attr_Elab_Body || attribute == Attr_Elab_Spec) - return (create_subprog_decl - (create_concat_name (Entity (Prefix (gnat_node)), - attribute == Attr_Elab_Body - ? "elabb" : "elabs"), - NULL_TREE, void_ftype, NULL_TREE, false, true, true, NULL, - gnat_node)); - - gnu_result = Attribute_to_gnu (gnat_node, &gnu_result_type, attribute); - } - break; - - case N_Reference: - /* Like 'Access as far as we are concerned. */ - gnu_result = gnat_to_gnu (Prefix (gnat_node)); - gnu_result = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_result); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - break; - - case N_Aggregate: - case N_Extension_Aggregate: - { - tree gnu_aggr_type; - - /* ??? It is wrong to evaluate the type now, but there doesn't - seem to be any other practical way of doing it. */ - - gcc_assert (!Expansion_Delayed (gnat_node)); - - gnu_aggr_type = gnu_result_type - = get_unpadded_type (Etype (gnat_node)); - - if (TREE_CODE (gnu_result_type) == RECORD_TYPE - && TYPE_CONTAINS_TEMPLATE_P (gnu_result_type)) - gnu_aggr_type - = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_result_type))); - - if (Null_Record_Present (gnat_node)) - gnu_result = gnat_build_constructor (gnu_aggr_type, NULL_TREE); - - else if (TREE_CODE (gnu_aggr_type) == RECORD_TYPE - || TREE_CODE (gnu_aggr_type) == UNION_TYPE) - gnu_result - = assoc_to_constructor (Etype (gnat_node), - First (Component_Associations (gnat_node)), - gnu_aggr_type); - else if (TREE_CODE (gnu_aggr_type) == ARRAY_TYPE) - gnu_result = pos_to_constructor (First (Expressions (gnat_node)), - gnu_aggr_type, - Component_Type (Etype (gnat_node))); - else if (TREE_CODE (gnu_aggr_type) == COMPLEX_TYPE) - gnu_result - = build_binary_op - (COMPLEX_EXPR, gnu_aggr_type, - gnat_to_gnu (Expression (First - (Component_Associations (gnat_node)))), - gnat_to_gnu (Expression - (Next - (First (Component_Associations (gnat_node)))))); - else - gcc_unreachable (); - - gnu_result = convert (gnu_result_type, gnu_result); - } - break; - - case N_Null: - if (TARGET_VTABLE_USES_DESCRIPTORS - && Ekind (Etype (gnat_node)) == E_Access_Subprogram_Type - && Is_Dispatch_Table_Entity (Etype (gnat_node))) - gnu_result = null_fdesc_node; - else - gnu_result = null_pointer_node; - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - break; - - case N_Type_Conversion: - case N_Qualified_Expression: - /* Get the operand expression. */ - gnu_result = gnat_to_gnu (Expression (gnat_node)); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - - gnu_result - = convert_with_check (Etype (gnat_node), gnu_result, - Do_Overflow_Check (gnat_node), - Do_Range_Check (Expression (gnat_node)), - Nkind (gnat_node) == N_Type_Conversion - && Float_Truncate (gnat_node)); - break; - - case N_Unchecked_Type_Conversion: - gnu_result = gnat_to_gnu (Expression (gnat_node)); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - - /* If the result is a pointer type, see if we are improperly - converting to a stricter alignment. */ - if (STRICT_ALIGNMENT && POINTER_TYPE_P (gnu_result_type) - && IN (Ekind (Etype (gnat_node)), Access_Kind)) - { - unsigned int align = known_alignment (gnu_result); - tree gnu_obj_type = TREE_TYPE (gnu_result_type); - unsigned int oalign = TYPE_ALIGN (gnu_obj_type); - - if (align != 0 && align < oalign && !TYPE_ALIGN_OK (gnu_obj_type)) - post_error_ne_tree_2 - ("?source alignment (^) '< alignment of & (^)", - gnat_node, Designated_Type (Etype (gnat_node)), - size_int (align / BITS_PER_UNIT), oalign / BITS_PER_UNIT); - } - - /* If we are converting a descriptor to a function pointer, first - build the pointer. */ - if (TARGET_VTABLE_USES_DESCRIPTORS - && TREE_TYPE (gnu_result) == fdesc_type_node - && POINTER_TYPE_P (gnu_result_type)) - gnu_result = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_result); - - gnu_result = unchecked_convert (gnu_result_type, gnu_result, - No_Truncation (gnat_node)); - break; - - case N_In: - case N_Not_In: - { - tree gnu_object = gnat_to_gnu (Left_Opnd (gnat_node)); - Node_Id gnat_range = Right_Opnd (gnat_node); - tree gnu_low; - tree gnu_high; - - /* GNAT_RANGE is either an N_Range node or an identifier - denoting a subtype. */ - if (Nkind (gnat_range) == N_Range) - { - gnu_low = gnat_to_gnu (Low_Bound (gnat_range)); - gnu_high = gnat_to_gnu (High_Bound (gnat_range)); - } - else if (Nkind (gnat_range) == N_Identifier - || Nkind (gnat_range) == N_Expanded_Name) - { - tree gnu_range_type = get_unpadded_type (Entity (gnat_range)); - - gnu_low = TYPE_MIN_VALUE (gnu_range_type); - gnu_high = TYPE_MAX_VALUE (gnu_range_type); - } - else - gcc_unreachable (); - - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - - /* If LOW and HIGH are identical, perform an equality test. - Otherwise, ensure that GNU_OBJECT is only evaluated once - and perform a full range test. */ - if (operand_equal_p (gnu_low, gnu_high, 0)) - gnu_result = build_binary_op (EQ_EXPR, gnu_result_type, - gnu_object, gnu_low); - else - { - gnu_object = protect_multiple_eval (gnu_object); - gnu_result - = build_binary_op (TRUTH_ANDIF_EXPR, gnu_result_type, - build_binary_op (GE_EXPR, gnu_result_type, - gnu_object, gnu_low), - build_binary_op (LE_EXPR, gnu_result_type, - gnu_object, gnu_high)); - } - - if (Nkind (gnat_node) == N_Not_In) - gnu_result = invert_truthvalue (gnu_result); - } - break; - - case N_Op_Divide: - gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node)); - gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node)); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - gnu_result = build_binary_op (FLOAT_TYPE_P (gnu_result_type) - ? RDIV_EXPR - : (Rounded_Result (gnat_node) - ? ROUND_DIV_EXPR : TRUNC_DIV_EXPR), - gnu_result_type, gnu_lhs, gnu_rhs); - break; - - case N_Op_Or: case N_Op_And: case N_Op_Xor: - /* These can either be operations on booleans or on modular types. - Fall through for boolean types since that's the way GNU_CODES is - set up. */ - if (IN (Ekind (Underlying_Type (Etype (gnat_node))), - Modular_Integer_Kind)) - { - enum tree_code code - = (Nkind (gnat_node) == N_Op_Or ? BIT_IOR_EXPR - : Nkind (gnat_node) == N_Op_And ? BIT_AND_EXPR - : BIT_XOR_EXPR); - - gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node)); - gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node)); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - gnu_result = build_binary_op (code, gnu_result_type, - gnu_lhs, gnu_rhs); - break; - } - - /* ... fall through ... */ - - case N_Op_Eq: case N_Op_Ne: case N_Op_Lt: - case N_Op_Le: case N_Op_Gt: case N_Op_Ge: - case N_Op_Add: case N_Op_Subtract: case N_Op_Multiply: - case N_Op_Mod: case N_Op_Rem: - case N_Op_Rotate_Left: - case N_Op_Rotate_Right: - case N_Op_Shift_Left: - case N_Op_Shift_Right: - case N_Op_Shift_Right_Arithmetic: - case N_And_Then: case N_Or_Else: - { - enum tree_code code = gnu_codes[Nkind (gnat_node)]; - bool ignore_lhs_overflow = false; - tree gnu_type; - - gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node)); - gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node)); - gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node)); - - /* If this is a comparison operator, convert any references to - an unconstrained array value into a reference to the - actual array. */ - if (TREE_CODE_CLASS (code) == tcc_comparison) - { - gnu_lhs = maybe_unconstrained_array (gnu_lhs); - gnu_rhs = maybe_unconstrained_array (gnu_rhs); - } - - /* If the result type is a private type, its full view may be a - numeric subtype. The representation we need is that of its base - type, given that it is the result of an arithmetic operation. */ - else if (Is_Private_Type (Etype (gnat_node))) - gnu_type = gnu_result_type - = get_unpadded_type (Base_Type (Full_View (Etype (gnat_node)))); - - /* If this is a shift whose count is not guaranteed to be correct, - we need to adjust the shift count. */ - if (IN (Nkind (gnat_node), N_Op_Shift) - && !Shift_Count_OK (gnat_node)) - { - tree gnu_count_type = get_base_type (TREE_TYPE (gnu_rhs)); - tree gnu_max_shift - = convert (gnu_count_type, TYPE_SIZE (gnu_type)); - - if (Nkind (gnat_node) == N_Op_Rotate_Left - || Nkind (gnat_node) == N_Op_Rotate_Right) - gnu_rhs = build_binary_op (TRUNC_MOD_EXPR, gnu_count_type, - gnu_rhs, gnu_max_shift); - else if (Nkind (gnat_node) == N_Op_Shift_Right_Arithmetic) - gnu_rhs - = build_binary_op - (MIN_EXPR, gnu_count_type, - build_binary_op (MINUS_EXPR, - gnu_count_type, - gnu_max_shift, - convert (gnu_count_type, - integer_one_node)), - gnu_rhs); - } - - /* For right shifts, the type says what kind of shift to do, - so we may need to choose a different type. In this case, - we have to ignore integer overflow lest it propagates all - the way down and causes a CE to be explicitly raised. */ - if (Nkind (gnat_node) == N_Op_Shift_Right - && !TYPE_UNSIGNED (gnu_type)) - { - gnu_type = gnat_unsigned_type (gnu_type); - ignore_lhs_overflow = true; - } - else if (Nkind (gnat_node) == N_Op_Shift_Right_Arithmetic - && TYPE_UNSIGNED (gnu_type)) - { - gnu_type = gnat_signed_type (gnu_type); - ignore_lhs_overflow = true; - } - - if (gnu_type != gnu_result_type) - { - tree gnu_old_lhs = gnu_lhs; - gnu_lhs = convert (gnu_type, gnu_lhs); - if (TREE_CODE (gnu_lhs) == INTEGER_CST && ignore_lhs_overflow) - TREE_OVERFLOW (gnu_lhs) = TREE_OVERFLOW (gnu_old_lhs); - gnu_rhs = convert (gnu_type, gnu_rhs); - } - - /* Instead of expanding overflow checks for addition, subtraction - and multiplication itself, the front end will leave this to - the back end when Backend_Overflow_Checks_On_Target is set. - As the GCC back end itself does not know yet how to properly - do overflow checking, do it here. The goal is to push - the expansions further into the back end over time. */ - if (Do_Overflow_Check (gnat_node) && Backend_Overflow_Checks_On_Target - && (Nkind (gnat_node) == N_Op_Add - || Nkind (gnat_node) == N_Op_Subtract - || Nkind (gnat_node) == N_Op_Multiply) - && !TYPE_UNSIGNED (gnu_type) - && !FLOAT_TYPE_P (gnu_type)) - gnu_result - = build_binary_op_trapv (code, gnu_type, gnu_lhs, gnu_rhs); - else - gnu_result = build_binary_op (code, gnu_type, gnu_lhs, gnu_rhs); - - /* If this is a logical shift with the shift count not verified, - we must return zero if it is too large. We cannot compensate - above in this case. */ - if ((Nkind (gnat_node) == N_Op_Shift_Left - || Nkind (gnat_node) == N_Op_Shift_Right) - && !Shift_Count_OK (gnat_node)) - gnu_result - = build_cond_expr - (gnu_type, - build_binary_op (GE_EXPR, integer_type_node, - gnu_rhs, - convert (TREE_TYPE (gnu_rhs), - TYPE_SIZE (gnu_type))), - convert (gnu_type, integer_zero_node), - gnu_result); - } - break; - - case N_Conditional_Expression: - { - tree gnu_cond = gnat_to_gnu (First (Expressions (gnat_node))); - tree gnu_true = gnat_to_gnu (Next (First (Expressions (gnat_node)))); - tree gnu_false - = gnat_to_gnu (Next (Next (First (Expressions (gnat_node))))); - - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - gnu_result = build_cond_expr (gnu_result_type, - gnat_truthvalue_conversion (gnu_cond), - gnu_true, gnu_false); - } - break; - - case N_Op_Plus: - gnu_result = gnat_to_gnu (Right_Opnd (gnat_node)); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - break; - - case N_Op_Not: - /* This case can apply to a boolean or a modular type. - Fall through for a boolean operand since GNU_CODES is set - up to handle this. */ - if (Is_Modular_Integer_Type (Etype (gnat_node)) - || (Ekind (Etype (gnat_node)) == E_Private_Type - && Is_Modular_Integer_Type (Full_View (Etype (gnat_node))))) - { - gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node)); - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - gnu_result = build_unary_op (BIT_NOT_EXPR, gnu_result_type, - gnu_expr); - break; - } - - /* ... fall through ... */ - - case N_Op_Minus: case N_Op_Abs: - gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node)); - - if (Ekind (Etype (gnat_node)) != E_Private_Type) - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - else - gnu_result_type = get_unpadded_type (Base_Type - (Full_View (Etype (gnat_node)))); - - if (Do_Overflow_Check (gnat_node) - && !TYPE_UNSIGNED (gnu_result_type) - && !FLOAT_TYPE_P (gnu_result_type)) - gnu_result = build_unary_op_trapv (gnu_codes[Nkind (gnat_node)], - gnu_result_type, gnu_expr); - else - gnu_result = build_unary_op (gnu_codes[Nkind (gnat_node)], - gnu_result_type, gnu_expr); - break; - - case N_Allocator: - { - tree gnu_init = 0; - tree gnu_type; - bool ignore_init_type = false; - - gnat_temp = Expression (gnat_node); - - /* The Expression operand can either be an N_Identifier or - Expanded_Name, which must represent a type, or a - N_Qualified_Expression, which contains both the object type and an - initial value for the object. */ - if (Nkind (gnat_temp) == N_Identifier - || Nkind (gnat_temp) == N_Expanded_Name) - gnu_type = gnat_to_gnu_type (Entity (gnat_temp)); - else if (Nkind (gnat_temp) == N_Qualified_Expression) - { - Entity_Id gnat_desig_type - = Designated_Type (Underlying_Type (Etype (gnat_node))); - - ignore_init_type = Has_Constrained_Partial_View (gnat_desig_type); - gnu_init = gnat_to_gnu (Expression (gnat_temp)); - - gnu_init = maybe_unconstrained_array (gnu_init); - if (Do_Range_Check (Expression (gnat_temp))) - gnu_init = emit_range_check (gnu_init, gnat_desig_type); - - if (Is_Elementary_Type (gnat_desig_type) - || Is_Constrained (gnat_desig_type)) - { - gnu_type = gnat_to_gnu_type (gnat_desig_type); - gnu_init = convert (gnu_type, gnu_init); - } - else - { - gnu_type = gnat_to_gnu_type (Etype (Expression (gnat_temp))); - if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE) - gnu_type = TREE_TYPE (gnu_init); - - gnu_init = convert (gnu_type, gnu_init); - } - } - else - gcc_unreachable (); - - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - return build_allocator (gnu_type, gnu_init, gnu_result_type, - Procedure_To_Call (gnat_node), - Storage_Pool (gnat_node), gnat_node, - ignore_init_type); - } - break; - - /***************************/ - /* Chapter 5: Statements: */ - /***************************/ - - case N_Label: - gnu_result = build1 (LABEL_EXPR, void_type_node, - gnat_to_gnu (Identifier (gnat_node))); - break; - - case N_Null_Statement: - gnu_result = alloc_stmt_list (); - break; - - case N_Assignment_Statement: - /* Get the LHS and RHS of the statement and convert any reference to an - unconstrained array into a reference to the underlying array. - If we are not to do range checking and the RHS is an N_Function_Call, - pass the LHS to the call function. */ - gnu_lhs = maybe_unconstrained_array (gnat_to_gnu (Name (gnat_node))); - - /* If the type has a size that overflows, convert this into raise of - Storage_Error: execution shouldn't have gotten here anyway. */ - if (TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (gnu_lhs))) == INTEGER_CST - && TREE_OVERFLOW (TYPE_SIZE_UNIT (TREE_TYPE (gnu_lhs)))) - gnu_result = build_call_raise (SE_Object_Too_Large, gnat_node, - N_Raise_Storage_Error); - else if (Nkind (Expression (gnat_node)) == N_Function_Call - && !Do_Range_Check (Expression (gnat_node))) - gnu_result = call_to_gnu (Expression (gnat_node), - &gnu_result_type, gnu_lhs); - else - { - gnu_rhs - = maybe_unconstrained_array (gnat_to_gnu (Expression (gnat_node))); - - /* If range check is needed, emit code to generate it. */ - if (Do_Range_Check (Expression (gnat_node))) - gnu_rhs = emit_range_check (gnu_rhs, Etype (Name (gnat_node))); - - gnu_result - = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_lhs, gnu_rhs); - - /* If the type being assigned is an array type and the two sides - are not completely disjoint, play safe and use memmove. */ - if (TREE_CODE (gnu_result) == MODIFY_EXPR - && Is_Array_Type (Etype (Name (gnat_node))) - && !(Forwards_OK (gnat_node) && Backwards_OK (gnat_node))) - { - tree to, from, size, to_ptr, from_ptr, t; - - to = TREE_OPERAND (gnu_result, 0); - from = TREE_OPERAND (gnu_result, 1); - - size = TYPE_SIZE_UNIT (TREE_TYPE (from)); - size = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, from); - - to_ptr = build_fold_addr_expr (to); - from_ptr = build_fold_addr_expr (from); - - t = implicit_built_in_decls[BUILT_IN_MEMMOVE]; - gnu_result = build_call_expr (t, 3, to_ptr, from_ptr, size); - } - } - break; - - case N_If_Statement: - { - tree *gnu_else_ptr; /* Point to put next "else if" or "else". */ - - /* Make the outer COND_EXPR. Avoid non-determinism. */ - gnu_result = build3 (COND_EXPR, void_type_node, - gnat_to_gnu (Condition (gnat_node)), - NULL_TREE, NULL_TREE); - COND_EXPR_THEN (gnu_result) - = build_stmt_group (Then_Statements (gnat_node), false); - TREE_SIDE_EFFECTS (gnu_result) = 1; - gnu_else_ptr = &COND_EXPR_ELSE (gnu_result); - - /* Now make a COND_EXPR for each of the "else if" parts. Put each - into the previous "else" part and point to where to put any - outer "else". Also avoid non-determinism. */ - if (Present (Elsif_Parts (gnat_node))) - for (gnat_temp = First (Elsif_Parts (gnat_node)); - Present (gnat_temp); gnat_temp = Next (gnat_temp)) - { - gnu_expr = build3 (COND_EXPR, void_type_node, - gnat_to_gnu (Condition (gnat_temp)), - NULL_TREE, NULL_TREE); - COND_EXPR_THEN (gnu_expr) - = build_stmt_group (Then_Statements (gnat_temp), false); - TREE_SIDE_EFFECTS (gnu_expr) = 1; - set_expr_location_from_node (gnu_expr, gnat_temp); - *gnu_else_ptr = gnu_expr; - gnu_else_ptr = &COND_EXPR_ELSE (gnu_expr); - } - - *gnu_else_ptr = build_stmt_group (Else_Statements (gnat_node), false); - } - break; - - case N_Case_Statement: - gnu_result = Case_Statement_to_gnu (gnat_node); - break; - - case N_Loop_Statement: - gnu_result = Loop_Statement_to_gnu (gnat_node); - break; - - case N_Block_Statement: - start_stmt_group (); - gnat_pushlevel (); - process_decls (Declarations (gnat_node), Empty, Empty, true, true); - add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node))); - gnat_poplevel (); - gnu_result = end_stmt_group (); - - if (Present (Identifier (gnat_node))) - mark_out_of_scope (Entity (Identifier (gnat_node))); - break; - - case N_Exit_Statement: - gnu_result - = build2 (EXIT_STMT, void_type_node, - (Present (Condition (gnat_node)) - ? gnat_to_gnu (Condition (gnat_node)) : NULL_TREE), - (Present (Name (gnat_node)) - ? get_gnu_tree (Entity (Name (gnat_node))) - : TREE_VALUE (gnu_loop_label_stack))); - break; - - case N_Return_Statement: - { - /* The gnu function type of the subprogram currently processed. */ - tree gnu_subprog_type = TREE_TYPE (current_function_decl); - /* The return value from the subprogram. */ - tree gnu_ret_val = NULL_TREE; - /* The place to put the return value. */ - tree gnu_lhs; - - /* If we are dealing with a "return;" from an Ada procedure with - parameters passed by copy in copy out, we need to return a record - containing the final values of these parameters. If the list - contains only one entry, return just that entry. - - For a full description of the copy in copy out parameter mechanism, - see the part of the gnat_to_gnu_entity routine dealing with the - translation of subprograms. - - But if we have a return label defined, convert this into - a branch to that label. */ - - if (TREE_VALUE (gnu_return_label_stack)) - { - gnu_result = build1 (GOTO_EXPR, void_type_node, - TREE_VALUE (gnu_return_label_stack)); - break; - } - - else if (TYPE_CI_CO_LIST (gnu_subprog_type)) - { - gnu_lhs = DECL_RESULT (current_function_decl); - if (list_length (TYPE_CI_CO_LIST (gnu_subprog_type)) == 1) - gnu_ret_val = TREE_VALUE (TYPE_CI_CO_LIST (gnu_subprog_type)); - else - gnu_ret_val - = gnat_build_constructor (TREE_TYPE (gnu_subprog_type), - TYPE_CI_CO_LIST (gnu_subprog_type)); - } - - /* If the Ada subprogram is a function, we just need to return the - expression. If the subprogram returns an unconstrained - array, we have to allocate a new version of the result and - return it. If we return by reference, return a pointer. */ - - else if (Present (Expression (gnat_node))) - { - /* If the current function returns by target pointer and we - are doing a call, pass that target to the call. */ - if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type) - && Nkind (Expression (gnat_node)) == N_Function_Call) - { - gnu_lhs - = build_unary_op (INDIRECT_REF, NULL_TREE, - DECL_ARGUMENTS (current_function_decl)); - gnu_result = call_to_gnu (Expression (gnat_node), - &gnu_result_type, gnu_lhs); - } - else - { - gnu_ret_val = gnat_to_gnu (Expression (gnat_node)); - - if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type)) - /* The original return type was unconstrained so dereference - the TARGET pointer in the actual return value's type. */ - gnu_lhs - = build_unary_op (INDIRECT_REF, TREE_TYPE (gnu_ret_val), - DECL_ARGUMENTS (current_function_decl)); - else - gnu_lhs = DECL_RESULT (current_function_decl); - - /* Do not remove the padding from GNU_RET_VAL if the inner - type is self-referential since we want to allocate the fixed - size in that case. */ - if (TREE_CODE (gnu_ret_val) == COMPONENT_REF - && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0))) - == RECORD_TYPE) - && (TYPE_IS_PADDING_P - (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0)))) - && (CONTAINS_PLACEHOLDER_P - (TYPE_SIZE (TREE_TYPE (gnu_ret_val))))) - gnu_ret_val = TREE_OPERAND (gnu_ret_val, 0); - - if (TYPE_RETURNS_BY_REF_P (gnu_subprog_type) - || By_Ref (gnat_node)) - gnu_ret_val - = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_ret_val); - - else if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type)) - { - gnu_ret_val = maybe_unconstrained_array (gnu_ret_val); - gnu_ret_val - = build_allocator (TREE_TYPE (gnu_ret_val), - gnu_ret_val, - TREE_TYPE (gnu_subprog_type), - Procedure_To_Call (gnat_node), - Storage_Pool (gnat_node), - gnat_node, false); - } - } - } - else - /* If the Ada subprogram is a regular procedure, just return. */ - gnu_lhs = NULL_TREE; - - if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type)) - { - if (gnu_ret_val) - gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE, - gnu_lhs, gnu_ret_val); - add_stmt_with_node (gnu_result, gnat_node); - gnu_lhs = NULL_TREE; - } - - gnu_result = build_return_expr (gnu_lhs, gnu_ret_val); - } - break; - - case N_Goto_Statement: - gnu_result = build1 (GOTO_EXPR, void_type_node, - gnat_to_gnu (Name (gnat_node))); - break; - - /****************************/ - /* Chapter 6: Subprograms: */ - /****************************/ - - case N_Subprogram_Declaration: - /* Unless there is a freeze node, declare the subprogram. We consider - this a "definition" even though we're not generating code for - the subprogram because we will be making the corresponding GCC - node here. */ - - if (No (Freeze_Node (Defining_Entity (Specification (gnat_node))))) - gnat_to_gnu_entity (Defining_Entity (Specification (gnat_node)), - NULL_TREE, 1); - gnu_result = alloc_stmt_list (); - break; - - case N_Abstract_Subprogram_Declaration: - /* This subprogram doesn't exist for code generation purposes, but we - have to elaborate the types of any parameters and result, unless - they are imported types (nothing to generate in this case). */ - - /* Process the parameter types first. */ - - for (gnat_temp - = First_Formal_With_Extras - (Defining_Entity (Specification (gnat_node))); - Present (gnat_temp); - gnat_temp = Next_Formal_With_Extras (gnat_temp)) - if (Is_Itype (Etype (gnat_temp)) - && !From_With_Type (Etype (gnat_temp))) - gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0); - - - /* Then the result type, set to Standard_Void_Type for procedures. */ - - { - Entity_Id gnat_temp_type - = Etype (Defining_Entity (Specification (gnat_node))); - - if (Is_Itype (gnat_temp_type) && !From_With_Type (gnat_temp_type)) - gnat_to_gnu_entity (Etype (gnat_temp_type), NULL_TREE, 0); - } - - gnu_result = alloc_stmt_list (); - break; - - case N_Defining_Program_Unit_Name: - /* For a child unit identifier go up a level to get the - specification. We get this when we try to find the spec of - a child unit package that is the compilation unit being compiled. */ - gnu_result = gnat_to_gnu (Parent (gnat_node)); - break; - - case N_Subprogram_Body: - Subprogram_Body_to_gnu (gnat_node); - gnu_result = alloc_stmt_list (); - break; - - case N_Function_Call: - case N_Procedure_Call_Statement: - gnu_result = call_to_gnu (gnat_node, &gnu_result_type, NULL_TREE); - break; - - /*************************/ - /* Chapter 7: Packages: */ - /*************************/ - - case N_Package_Declaration: - gnu_result = gnat_to_gnu (Specification (gnat_node)); - break; - - case N_Package_Specification: - - start_stmt_group (); - process_decls (Visible_Declarations (gnat_node), - Private_Declarations (gnat_node), Empty, true, true); - gnu_result = end_stmt_group (); - break; - - case N_Package_Body: - - /* If this is the body of a generic package - do nothing */ - if (Ekind (Corresponding_Spec (gnat_node)) == E_Generic_Package) - { - gnu_result = alloc_stmt_list (); - break; - } - - start_stmt_group (); - process_decls (Declarations (gnat_node), Empty, Empty, true, true); - - if (Present (Handled_Statement_Sequence (gnat_node))) - add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node))); - - gnu_result = end_stmt_group (); - break; - - /*********************************/ - /* Chapter 8: Visibility Rules: */ - /*********************************/ - - case N_Use_Package_Clause: - case N_Use_Type_Clause: - /* Nothing to do here - but these may appear in list of declarations */ - gnu_result = alloc_stmt_list (); - break; - - /***********************/ - /* Chapter 9: Tasks: */ - /***********************/ - - case N_Protected_Type_Declaration: - gnu_result = alloc_stmt_list (); - break; - - case N_Single_Task_Declaration: - gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, 1); - gnu_result = alloc_stmt_list (); - break; - - /***********************************************************/ - /* Chapter 10: Program Structure and Compilation Issues: */ - /***********************************************************/ - - case N_Compilation_Unit: - - /* This is not called for the main unit, which is handled in function - gigi above. */ - start_stmt_group (); - gnat_pushlevel (); - - Compilation_Unit_to_gnu (gnat_node); - gnu_result = alloc_stmt_list (); - break; - - case N_Subprogram_Body_Stub: - case N_Package_Body_Stub: - case N_Protected_Body_Stub: - case N_Task_Body_Stub: - /* Simply process whatever unit is being inserted. */ - gnu_result = gnat_to_gnu (Unit (Library_Unit (gnat_node))); - break; - - case N_Subunit: - gnu_result = gnat_to_gnu (Proper_Body (gnat_node)); - break; - - /***************************/ - /* Chapter 11: Exceptions: */ - /***************************/ - - case N_Handled_Sequence_Of_Statements: - /* If there is an At_End procedure attached to this node, and the EH - mechanism is SJLJ, we must have at least a corresponding At_End - handler, unless the No_Exception_Handlers restriction is set. */ - gcc_assert (type_annotate_only - || Exception_Mechanism != Setjmp_Longjmp - || No (At_End_Proc (gnat_node)) - || Present (Exception_Handlers (gnat_node)) - || No_Exception_Handlers_Set ()); - - gnu_result = Handled_Sequence_Of_Statements_to_gnu (gnat_node); - break; - - case N_Exception_Handler: - if (Exception_Mechanism == Setjmp_Longjmp) - gnu_result = Exception_Handler_to_gnu_sjlj (gnat_node); - else if (Exception_Mechanism == Back_End_Exceptions) - gnu_result = Exception_Handler_to_gnu_zcx (gnat_node); - else - gcc_unreachable (); - - break; - - case N_Push_Constraint_Error_Label: - push_exception_label_stack (&gnu_constraint_error_label_stack, - Exception_Label (gnat_node)); - break; - - case N_Push_Storage_Error_Label: - push_exception_label_stack (&gnu_storage_error_label_stack, - Exception_Label (gnat_node)); - break; - - case N_Push_Program_Error_Label: - push_exception_label_stack (&gnu_program_error_label_stack, - Exception_Label (gnat_node)); - break; - - case N_Pop_Constraint_Error_Label: - gnu_constraint_error_label_stack - = TREE_CHAIN (gnu_constraint_error_label_stack); - break; - - case N_Pop_Storage_Error_Label: - gnu_storage_error_label_stack - = TREE_CHAIN (gnu_storage_error_label_stack); - break; - - case N_Pop_Program_Error_Label: - gnu_program_error_label_stack - = TREE_CHAIN (gnu_program_error_label_stack); - break; - - /*******************************/ - /* Chapter 12: Generic Units: */ - /*******************************/ - - case N_Generic_Function_Renaming_Declaration: - case N_Generic_Package_Renaming_Declaration: - case N_Generic_Procedure_Renaming_Declaration: - case N_Generic_Package_Declaration: - case N_Generic_Subprogram_Declaration: - case N_Package_Instantiation: - case N_Procedure_Instantiation: - case N_Function_Instantiation: - /* These nodes can appear on a declaration list but there is nothing to - to be done with them. */ - gnu_result = alloc_stmt_list (); - break; - - /***************************************************/ - /* Chapter 13: Representation Clauses and */ - /* Implementation-Dependent Features: */ - /***************************************************/ - - case N_Attribute_Definition_Clause: - gnu_result = alloc_stmt_list (); - - /* The only one we need to deal with is 'Address since, for the others, - the front-end puts the information elsewhere. */ - if (Get_Attribute_Id (Chars (gnat_node)) != Attr_Address) - break; - - /* And we only deal with 'Address if the object has a Freeze node. */ - gnat_temp = Entity (Name (gnat_node)); - if (No (Freeze_Node (gnat_temp))) - break; - - /* Get the value to use as the address and save it as the equivalent - for the object. When it is frozen, gnat_to_gnu_entity will do the - right thing. */ - save_gnu_tree (gnat_temp, gnat_to_gnu (Expression (gnat_node)), true); - break; - - case N_Enumeration_Representation_Clause: - case N_Record_Representation_Clause: - case N_At_Clause: - /* We do nothing with these. SEM puts the information elsewhere. */ - gnu_result = alloc_stmt_list (); - break; - - case N_Code_Statement: - if (!type_annotate_only) - { - tree gnu_template = gnat_to_gnu (Asm_Template (gnat_node)); - tree gnu_inputs = NULL_TREE, gnu_outputs = NULL_TREE; - tree gnu_clobbers = NULL_TREE, tail; - bool allows_mem, allows_reg, fake; - int ninputs, noutputs, i; - const char **oconstraints; - const char *constraint; - char *clobber; - - /* First retrieve the 3 operand lists built by the front-end. */ - Setup_Asm_Outputs (gnat_node); - while (Present (gnat_temp = Asm_Output_Variable ())) - { - tree gnu_value = gnat_to_gnu (gnat_temp); - tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu - (Asm_Output_Constraint ())); - - gnu_outputs = tree_cons (gnu_constr, gnu_value, gnu_outputs); - Next_Asm_Output (); - } - - Setup_Asm_Inputs (gnat_node); - while (Present (gnat_temp = Asm_Input_Value ())) - { - tree gnu_value = gnat_to_gnu (gnat_temp); - tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu - (Asm_Input_Constraint ())); - - gnu_inputs = tree_cons (gnu_constr, gnu_value, gnu_inputs); - Next_Asm_Input (); - } - - Clobber_Setup (gnat_node); - while ((clobber = Clobber_Get_Next ())) - gnu_clobbers - = tree_cons (NULL_TREE, - build_string (strlen (clobber) + 1, clobber), - gnu_clobbers); - - /* Then perform some standard checking and processing on the - operands. In particular, mark them addressable if needed. */ - gnu_outputs = nreverse (gnu_outputs); - noutputs = list_length (gnu_outputs); - gnu_inputs = nreverse (gnu_inputs); - ninputs = list_length (gnu_inputs); - oconstraints - = (const char **) alloca (noutputs * sizeof (const char *)); - - for (i = 0, tail = gnu_outputs; tail; ++i, tail = TREE_CHAIN (tail)) - { - tree output = TREE_VALUE (tail); - constraint - = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail))); - oconstraints[i] = constraint; - - if (parse_output_constraint (&constraint, i, ninputs, noutputs, - &allows_mem, &allows_reg, &fake)) - { - /* If the operand is going to end up in memory, - mark it addressable. Note that we don't test - allows_mem like in the input case below; this - is modelled on the C front-end. */ - if (!allows_reg - && !gnat_mark_addressable (output)) - output = error_mark_node; - } - else - output = error_mark_node; - - TREE_VALUE (tail) = output; - } - - for (i = 0, tail = gnu_inputs; tail; ++i, tail = TREE_CHAIN (tail)) - { - tree input = TREE_VALUE (tail); - constraint - = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail))); - - if (parse_input_constraint (&constraint, i, ninputs, noutputs, - 0, oconstraints, - &allows_mem, &allows_reg)) - { - /* If the operand is going to end up in memory, - mark it addressable. */ - if (!allows_reg && allows_mem - && !gnat_mark_addressable (input)) - input = error_mark_node; - } - else - input = error_mark_node; - - TREE_VALUE (tail) = input; - } - - gnu_result = build4 (ASM_EXPR, void_type_node, - gnu_template, gnu_outputs, - gnu_inputs, gnu_clobbers); - ASM_VOLATILE_P (gnu_result) = Is_Asm_Volatile (gnat_node); - } - else - gnu_result = alloc_stmt_list (); - - break; - - /***************************************************/ - /* Added Nodes */ - /***************************************************/ - - case N_Freeze_Entity: - start_stmt_group (); - process_freeze_entity (gnat_node); - process_decls (Actions (gnat_node), Empty, Empty, true, true); - gnu_result = end_stmt_group (); - break; - - case N_Itype_Reference: - if (!present_gnu_tree (Itype (gnat_node))) - process_type (Itype (gnat_node)); - - gnu_result = alloc_stmt_list (); - break; - - case N_Free_Statement: - if (!type_annotate_only) - { - tree gnu_ptr = gnat_to_gnu (Expression (gnat_node)); - tree gnu_ptr_type = TREE_TYPE (gnu_ptr); - tree gnu_obj_type; - tree gnu_actual_obj_type = 0; - tree gnu_obj_size; - unsigned int align; - unsigned int default_allocator_alignment - = get_target_default_allocator_alignment () * BITS_PER_UNIT; - - /* If this is a thin pointer, we must dereference it to create - a fat pointer, then go back below to a thin pointer. The - reason for this is that we need a fat pointer someplace in - order to properly compute the size. */ - if (TYPE_THIN_POINTER_P (TREE_TYPE (gnu_ptr))) - gnu_ptr = build_unary_op (ADDR_EXPR, NULL_TREE, - build_unary_op (INDIRECT_REF, NULL_TREE, - gnu_ptr)); - - /* If this is an unconstrained array, we know the object must - have been allocated with the template in front of the object. - So pass the template address, but get the total size. Do this - by converting to a thin pointer. */ - if (TYPE_FAT_POINTER_P (TREE_TYPE (gnu_ptr))) - gnu_ptr - = convert (build_pointer_type - (TYPE_OBJECT_RECORD_TYPE - (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr)))), - gnu_ptr); - - gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr)); - - if (Present (Actual_Designated_Subtype (gnat_node))) - { - gnu_actual_obj_type - = gnat_to_gnu_type (Actual_Designated_Subtype (gnat_node)); - - if (TYPE_FAT_OR_THIN_POINTER_P (gnu_ptr_type)) - gnu_actual_obj_type - = build_unc_object_type_from_ptr (gnu_ptr_type, - gnu_actual_obj_type, - get_identifier ("DEALLOC")); - } - else - gnu_actual_obj_type = gnu_obj_type; - - gnu_obj_size = TYPE_SIZE_UNIT (gnu_actual_obj_type); - align = TYPE_ALIGN (gnu_obj_type); - - if (TREE_CODE (gnu_obj_type) == RECORD_TYPE - && TYPE_CONTAINS_TEMPLATE_P (gnu_obj_type)) - { - tree gnu_char_ptr_type = build_pointer_type (char_type_node); - tree gnu_pos = byte_position (TYPE_FIELDS (gnu_obj_type)); - tree gnu_byte_offset - = convert (sizetype, - size_diffop (size_zero_node, gnu_pos)); - gnu_byte_offset = fold_build1 (NEGATE_EXPR, sizetype, gnu_byte_offset); - - gnu_ptr = convert (gnu_char_ptr_type, gnu_ptr); - gnu_ptr = build_binary_op (POINTER_PLUS_EXPR, gnu_char_ptr_type, - gnu_ptr, gnu_byte_offset); - } - - /* If the object was allocated from the default storage pool, the - alignment was greater than what the allocator provides, and this - is not a fat or thin pointer, what we have in gnu_ptr here is an - address dynamically adjusted to match the alignment requirement - (see build_allocator). What we need to pass to free is the - initial allocator's return value, which has been stored just in - front of the block we have. */ - - if (No (Procedure_To_Call (gnat_node)) - && align > default_allocator_alignment - && ! TYPE_FAT_OR_THIN_POINTER_P (gnu_ptr_type)) - { - /* We set GNU_PTR - as * (void **)((void *)GNU_PTR - (void *)sizeof(void *)) - in two steps: */ - - /* GNU_PTR (void *) - = (void *)GNU_PTR - (void *)sizeof (void *)) */ - gnu_ptr - = build_binary_op - (POINTER_PLUS_EXPR, ptr_void_type_node, - convert (ptr_void_type_node, gnu_ptr), - size_int (-POINTER_SIZE/BITS_PER_UNIT)); - - /* GNU_PTR (void *) = *(void **)GNU_PTR */ - gnu_ptr - = build_unary_op - (INDIRECT_REF, NULL_TREE, - convert (build_pointer_type (ptr_void_type_node), - gnu_ptr)); - } - - gnu_result = build_call_alloc_dealloc (gnu_ptr, gnu_obj_size, align, - Procedure_To_Call (gnat_node), - Storage_Pool (gnat_node), - gnat_node); - } - break; - - case N_Raise_Constraint_Error: - case N_Raise_Program_Error: - case N_Raise_Storage_Error: - if (type_annotate_only) - { - gnu_result = alloc_stmt_list (); - break; - } - - gnu_result_type = get_unpadded_type (Etype (gnat_node)); - gnu_result - = build_call_raise (UI_To_Int (Reason (gnat_node)), gnat_node, - Nkind (gnat_node)); - - /* If the type is VOID, this is a statement, so we need to - generate the code for the call. Handle a Condition, if there - is one. */ - if (TREE_CODE (gnu_result_type) == VOID_TYPE) - { - set_expr_location_from_node (gnu_result, gnat_node); - - if (Present (Condition (gnat_node))) - gnu_result = build3 (COND_EXPR, void_type_node, - gnat_to_gnu (Condition (gnat_node)), - gnu_result, alloc_stmt_list ()); - } - else - gnu_result = build1 (NULL_EXPR, gnu_result_type, gnu_result); - break; - - case N_Validate_Unchecked_Conversion: - { - Entity_Id gnat_target_type = Target_Type (gnat_node); - tree gnu_source_type = gnat_to_gnu_type (Source_Type (gnat_node)); - tree gnu_target_type = gnat_to_gnu_type (gnat_target_type); - - /* No need for any warning in this case. */ - if (!flag_strict_aliasing) - ; - - /* If the result is a pointer type, see if we are either converting - from a non-pointer or from a pointer to a type with a different - alias set and warn if so. If the result is defined in the same - unit as this unchecked conversion, we can allow this because we - can know to make the pointer type behave properly. */ - else if (POINTER_TYPE_P (gnu_target_type) - && !In_Same_Source_Unit (gnat_target_type, gnat_node) - && !No_Strict_Aliasing (Underlying_Type (gnat_target_type))) - { - tree gnu_source_desig_type = POINTER_TYPE_P (gnu_source_type) - ? TREE_TYPE (gnu_source_type) - : NULL_TREE; - tree gnu_target_desig_type = TREE_TYPE (gnu_target_type); - - if ((TYPE_DUMMY_P (gnu_target_desig_type) - || get_alias_set (gnu_target_desig_type) != 0) - && (!POINTER_TYPE_P (gnu_source_type) - || (TYPE_DUMMY_P (gnu_source_desig_type) - != TYPE_DUMMY_P (gnu_target_desig_type)) - || (TYPE_DUMMY_P (gnu_source_desig_type) - && gnu_source_desig_type != gnu_target_desig_type) - || !alias_sets_conflict_p - (get_alias_set (gnu_source_desig_type), - get_alias_set (gnu_target_desig_type)))) - { - post_error_ne - ("?possible aliasing problem for type&", - gnat_node, Target_Type (gnat_node)); - post_error - ("\\?use -fno-strict-aliasing switch for references", - gnat_node); - post_error_ne - ("\\?or use `pragma No_Strict_Aliasing (&);`", - gnat_node, Target_Type (gnat_node)); - } - } - - /* But if the result is a fat pointer type, we have no mechanism to - do that, so we unconditionally warn in problematic cases. */ - else if (TYPE_FAT_POINTER_P (gnu_target_type)) - { - tree gnu_source_array_type - = TYPE_FAT_POINTER_P (gnu_source_type) - ? TREE_TYPE (TREE_TYPE (TYPE_FIELDS (gnu_source_type))) - : NULL_TREE; - tree gnu_target_array_type - = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (gnu_target_type))); - - if ((TYPE_DUMMY_P (gnu_target_array_type) - || get_alias_set (gnu_target_array_type) != 0) - && (!TYPE_FAT_POINTER_P (gnu_source_type) - || (TYPE_DUMMY_P (gnu_source_array_type) - != TYPE_DUMMY_P (gnu_target_array_type)) - || (TYPE_DUMMY_P (gnu_source_array_type) - && gnu_source_array_type != gnu_target_array_type) - || !alias_sets_conflict_p - (get_alias_set (gnu_source_array_type), - get_alias_set (gnu_target_array_type)))) - { - post_error_ne - ("?possible aliasing problem for type&", - gnat_node, Target_Type (gnat_node)); - post_error - ("\\?use -fno-strict-aliasing switch for references", - gnat_node); - } - } - } - gnu_result = alloc_stmt_list (); - break; - - case N_Raise_Statement: - case N_Function_Specification: - case N_Procedure_Specification: - case N_Op_Concat: - case N_Component_Association: - case N_Task_Body: - default: - gcc_assert (type_annotate_only); - gnu_result = alloc_stmt_list (); - } - - /* If we pushed our level as part of processing the elaboration routine, - pop it back now. */ - if (went_into_elab_proc) - { - add_stmt (gnu_result); - gnat_poplevel (); - gnu_result = end_stmt_group (); - current_function_decl = NULL_TREE; - } - - /* Set the location information on the result if it is a real expression. - References can be reused for multiple GNAT nodes and they would get - the location information of their last use. Note that we may have - no result if we tried to build a CALL_EXPR node to a procedure with - no side-effects and optimization is enabled. */ - if (gnu_result - && EXPR_P (gnu_result) - && TREE_CODE (gnu_result) != NOP_EXPR - && !REFERENCE_CLASS_P (gnu_result)) - set_expr_location_from_node (gnu_result, gnat_node); - - /* If we're supposed to return something of void_type, it means we have - something we're elaborating for effect, so just return. */ - if (TREE_CODE (gnu_result_type) == VOID_TYPE) - return gnu_result; - - /* If the result is a constant that overflows, raise constraint error. */ - else if (TREE_CODE (gnu_result) == INTEGER_CST - && TREE_OVERFLOW (gnu_result)) - { - post_error ("Constraint_Error will be raised at run-time?", gnat_node); - - gnu_result - = build1 (NULL_EXPR, gnu_result_type, - build_call_raise (CE_Overflow_Check_Failed, gnat_node, - N_Raise_Constraint_Error)); - } - - /* If our result has side-effects and is of an unconstrained type, - make a SAVE_EXPR so that we can be sure it will only be referenced - once. Note we must do this before any conversions. */ - if (TREE_SIDE_EFFECTS (gnu_result) - && (TREE_CODE (gnu_result_type) == UNCONSTRAINED_ARRAY_TYPE - || CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type)))) - gnu_result = gnat_stabilize_reference (gnu_result, false); - - /* Now convert the result to the result type, unless we are in one of the - following cases: - - 1. If this is the Name of an assignment statement or a parameter of - a procedure call, return the result almost unmodified since the - RHS will have to be converted to our type in that case, unless - the result type has a simpler size. Similarly, don't convert - integral types that are the operands of an unchecked conversion - since we need to ignore those conversions (for 'Valid). - - 2. If we have a label (which doesn't have any well-defined type), a - field or an error, return the result almost unmodified. Also don't - do the conversion if the result type involves a PLACEHOLDER_EXPR in - its size since those are the cases where the front end may have the - type wrong due to "instantiating" the unconstrained record with - discriminant values. Similarly, if the two types are record types - with the same name don't convert. This will be the case when we are - converting from a packable version of a type to its original type and - we need those conversions to be NOPs in order for assignments into - these types to work properly. - - 3. If the type is void or if we have no result, return error_mark_node - to show we have no result. - - 4. Finally, if the type of the result is already correct. */ - - if (Present (Parent (gnat_node)) - && ((Nkind (Parent (gnat_node)) == N_Assignment_Statement - && Name (Parent (gnat_node)) == gnat_node) - || (Nkind (Parent (gnat_node)) == N_Procedure_Call_Statement - && Name (Parent (gnat_node)) != gnat_node) - || Nkind (Parent (gnat_node)) == N_Parameter_Association - || (Nkind (Parent (gnat_node)) == N_Unchecked_Type_Conversion - && !AGGREGATE_TYPE_P (gnu_result_type) - && !AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))) - && !(TYPE_SIZE (gnu_result_type) - && TYPE_SIZE (TREE_TYPE (gnu_result)) - && (AGGREGATE_TYPE_P (gnu_result_type) - == AGGREGATE_TYPE_P (TREE_TYPE (gnu_result))) - && ((TREE_CODE (TYPE_SIZE (gnu_result_type)) == INTEGER_CST - && (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_result))) - != INTEGER_CST)) - || (TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST - && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type)) - && (CONTAINS_PLACEHOLDER_P - (TYPE_SIZE (TREE_TYPE (gnu_result)))))) - && !(TREE_CODE (gnu_result_type) == RECORD_TYPE - && TYPE_JUSTIFIED_MODULAR_P (gnu_result_type)))) - { - /* Remove padding only if the inner object is of self-referential - size: in that case it must be an object of unconstrained type - with a default discriminant and we want to avoid copying too - much data. */ - if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE - && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result)) - && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS - (TREE_TYPE (gnu_result)))))) - gnu_result = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))), - gnu_result); - } - - else if (TREE_CODE (gnu_result) == LABEL_DECL - || TREE_CODE (gnu_result) == FIELD_DECL - || TREE_CODE (gnu_result) == ERROR_MARK - || (TYPE_SIZE (gnu_result_type) - && TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST - && TREE_CODE (gnu_result) != INDIRECT_REF - && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type))) - || ((TYPE_NAME (gnu_result_type) - == TYPE_NAME (TREE_TYPE (gnu_result))) - && TREE_CODE (gnu_result_type) == RECORD_TYPE - && TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE)) - { - /* Remove any padding. */ - if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE - && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result))) - gnu_result = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))), - gnu_result); - } - - else if (gnu_result == error_mark_node || gnu_result_type == void_type_node) - gnu_result = error_mark_node; - - else if (gnu_result_type != TREE_TYPE (gnu_result)) - gnu_result = convert (gnu_result_type, gnu_result); - - /* We don't need any NOP_EXPR or NON_LVALUE_EXPR on the result. */ - while ((TREE_CODE (gnu_result) == NOP_EXPR - || TREE_CODE (gnu_result) == NON_LVALUE_EXPR) - && TREE_TYPE (TREE_OPERAND (gnu_result, 0)) == TREE_TYPE (gnu_result)) - gnu_result = TREE_OPERAND (gnu_result, 0); - - return gnu_result; -} - -/* Subroutine of above to push the exception label stack. GNU_STACK is - a pointer to the stack to update and GNAT_LABEL, if present, is the - label to push onto the stack. */ - -static void -push_exception_label_stack (tree *gnu_stack, Entity_Id gnat_label) -{ - tree gnu_label = (Present (gnat_label) - ? gnat_to_gnu_entity (gnat_label, NULL_TREE, 0) - : NULL_TREE); - - *gnu_stack = tree_cons (NULL_TREE, gnu_label, *gnu_stack); -} - -/* Record the current code position in GNAT_NODE. */ - -static void -record_code_position (Node_Id gnat_node) -{ - tree stmt_stmt = build1 (STMT_STMT, void_type_node, NULL_TREE); - - add_stmt_with_node (stmt_stmt, gnat_node); - save_gnu_tree (gnat_node, stmt_stmt, true); -} - -/* Insert the code for GNAT_NODE at the position saved for that node. */ - -static void -insert_code_for (Node_Id gnat_node) -{ - STMT_STMT_STMT (get_gnu_tree (gnat_node)) = gnat_to_gnu (gnat_node); - save_gnu_tree (gnat_node, NULL_TREE, true); -} - -/* Start a new statement group chained to the previous group. */ - -void -start_stmt_group (void) -{ - struct stmt_group *group = stmt_group_free_list; - - /* First see if we can get one from the free list. */ - if (group) - stmt_group_free_list = group->previous; - else - group = (struct stmt_group *) ggc_alloc (sizeof (struct stmt_group)); - - group->previous = current_stmt_group; - group->stmt_list = group->block = group->cleanups = NULL_TREE; - current_stmt_group = group; -} - -/* Add GNU_STMT to the current statement group. */ - -void -add_stmt (tree gnu_stmt) -{ - append_to_statement_list (gnu_stmt, ¤t_stmt_group->stmt_list); -} - -/* Similar, but set the location of GNU_STMT to that of GNAT_NODE. */ - -void -add_stmt_with_node (tree gnu_stmt, Node_Id gnat_node) -{ - if (Present (gnat_node)) - set_expr_location_from_node (gnu_stmt, gnat_node); - add_stmt (gnu_stmt); -} - -/* Add a declaration statement for GNU_DECL to the current statement group. - Get SLOC from Entity_Id. */ - -void -add_decl_expr (tree gnu_decl, Entity_Id gnat_entity) -{ - tree type = TREE_TYPE (gnu_decl); - tree gnu_stmt, gnu_init, t; - - /* If this is a variable that Gigi is to ignore, we may have been given - an ERROR_MARK. So test for it. We also might have been given a - reference for a renaming. So only do something for a decl. Also - ignore a TYPE_DECL for an UNCONSTRAINED_ARRAY_TYPE. */ - if (!DECL_P (gnu_decl) - || (TREE_CODE (gnu_decl) == TYPE_DECL - && TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE)) - return; - - gnu_stmt = build1 (DECL_EXPR, void_type_node, gnu_decl); - - /* If we are global, we don't want to actually output the DECL_EXPR for - this decl since we already have evaluated the expressions in the - sizes and positions as globals and doing it again would be wrong. */ - if (global_bindings_p ()) - { - /* Mark everything as used to prevent node sharing with subprograms. - Note that walk_tree knows how to deal with TYPE_DECL, but neither - VAR_DECL nor CONST_DECL. This appears to be somewhat arbitrary. */ - mark_visited (&gnu_stmt); - if (TREE_CODE (gnu_decl) == VAR_DECL - || TREE_CODE (gnu_decl) == CONST_DECL) - { - mark_visited (&DECL_SIZE (gnu_decl)); - mark_visited (&DECL_SIZE_UNIT (gnu_decl)); - mark_visited (&DECL_INITIAL (gnu_decl)); - } - /* In any case, we have to deal with our own TYPE_ADA_SIZE field. */ - if (TREE_CODE (gnu_decl) == TYPE_DECL - && (TREE_CODE (type) == RECORD_TYPE - || TREE_CODE (type) == UNION_TYPE - || TREE_CODE (type) == QUAL_UNION_TYPE) - && (t = TYPE_ADA_SIZE (type))) - mark_visited (&t); - } - else - add_stmt_with_node (gnu_stmt, gnat_entity); - - /* If this is a variable and an initializer is attached to it, it must be - valid for the context. Similar to init_const in create_var_decl_1. */ - if (TREE_CODE (gnu_decl) == VAR_DECL - && (gnu_init = DECL_INITIAL (gnu_decl)) != NULL_TREE - && (!gnat_types_compatible_p (type, TREE_TYPE (gnu_init)) - || (TREE_STATIC (gnu_decl) - && !initializer_constant_valid_p (gnu_init, - TREE_TYPE (gnu_init))))) - { - /* If GNU_DECL has a padded type, convert it to the unpadded - type so the assignment is done properly. */ - if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type)) - t = convert (TREE_TYPE (TYPE_FIELDS (type)), gnu_decl); - else - t = gnu_decl; - - gnu_stmt = build_binary_op (MODIFY_EXPR, NULL_TREE, t, gnu_init); - - DECL_INITIAL (gnu_decl) = NULL_TREE; - if (TREE_READONLY (gnu_decl)) - { - TREE_READONLY (gnu_decl) = 0; - DECL_READONLY_ONCE_ELAB (gnu_decl) = 1; - } - - add_stmt_with_node (gnu_stmt, gnat_entity); - } -} - -/* Callback for walk_tree to mark the visited trees rooted at *TP. */ - -static tree -mark_visited_r (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED) -{ - if (TREE_VISITED (*tp)) - *walk_subtrees = 0; - - /* Don't mark a dummy type as visited because we want to mark its sizes - and fields once it's filled in. */ - else if (!TYPE_IS_DUMMY_P (*tp)) - TREE_VISITED (*tp) = 1; - - if (TYPE_P (*tp)) - TYPE_SIZES_GIMPLIFIED (*tp) = 1; - - return NULL_TREE; -} - -/* Utility function to unshare expressions wrapped up in a SAVE_EXPR. */ - -static tree -unshare_save_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED, - void *data ATTRIBUTE_UNUSED) -{ - tree t = *tp; - - if (TREE_CODE (t) == SAVE_EXPR) - TREE_OPERAND (t, 0) = unshare_expr (TREE_OPERAND (t, 0)); - - return NULL_TREE; -} - -/* Mark nodes rooted at *TP with TREE_VISITED and types as having their - sized gimplified. We use this to indicate all variable sizes and - positions in global types may not be shared by any subprogram. */ - -void -mark_visited (tree *tp) -{ - walk_tree (tp, mark_visited_r, NULL, NULL); -} - -/* Add GNU_CLEANUP, a cleanup action, to the current code group and - set its location to that of GNAT_NODE if present. */ - -static void -add_cleanup (tree gnu_cleanup, Node_Id gnat_node) -{ - if (Present (gnat_node)) - set_expr_location_from_node (gnu_cleanup, gnat_node); - append_to_statement_list (gnu_cleanup, ¤t_stmt_group->cleanups); -} - -/* Set the BLOCK node corresponding to the current code group to GNU_BLOCK. */ - -void -set_block_for_group (tree gnu_block) -{ - gcc_assert (!current_stmt_group->block); - current_stmt_group->block = gnu_block; -} - -/* Return code corresponding to the current code group. It is normally - a STATEMENT_LIST, but may also be a BIND_EXPR or TRY_FINALLY_EXPR if - BLOCK or cleanups were set. */ - -tree -end_stmt_group (void) -{ - struct stmt_group *group = current_stmt_group; - tree gnu_retval = group->stmt_list; - - /* If this is a null list, allocate a new STATEMENT_LIST. Then, if there - are cleanups, make a TRY_FINALLY_EXPR. Last, if there is a BLOCK, - make a BIND_EXPR. Note that we nest in that because the cleanup may - reference variables in the block. */ - if (gnu_retval == NULL_TREE) - gnu_retval = alloc_stmt_list (); - - if (group->cleanups) - gnu_retval = build2 (TRY_FINALLY_EXPR, void_type_node, gnu_retval, - group->cleanups); - - if (current_stmt_group->block) - gnu_retval = build3 (BIND_EXPR, void_type_node, BLOCK_VARS (group->block), - gnu_retval, group->block); - - /* Remove this group from the stack and add it to the free list. */ - current_stmt_group = group->previous; - group->previous = stmt_group_free_list; - stmt_group_free_list = group; - - return gnu_retval; -} - -/* Add a list of statements from GNAT_LIST, a possibly-empty list of - statements.*/ - -static void -add_stmt_list (List_Id gnat_list) -{ - Node_Id gnat_node; - - if (Present (gnat_list)) - for (gnat_node = First (gnat_list); Present (gnat_node); - gnat_node = Next (gnat_node)) - add_stmt (gnat_to_gnu (gnat_node)); -} - -/* Build a tree from GNAT_LIST, a possibly-empty list of statements. - If BINDING_P is true, push and pop a binding level around the list. */ - -static tree -build_stmt_group (List_Id gnat_list, bool binding_p) -{ - start_stmt_group (); - if (binding_p) - gnat_pushlevel (); - - add_stmt_list (gnat_list); - if (binding_p) - gnat_poplevel (); - - return end_stmt_group (); -} - -/* Push and pop routines for stacks. We keep a free list around so we - don't waste tree nodes. */ - -static void -push_stack (tree *gnu_stack_ptr, tree gnu_purpose, tree gnu_value) -{ - tree gnu_node = gnu_stack_free_list; - - if (gnu_node) - { - gnu_stack_free_list = TREE_CHAIN (gnu_node); - TREE_CHAIN (gnu_node) = *gnu_stack_ptr; - TREE_PURPOSE (gnu_node) = gnu_purpose; - TREE_VALUE (gnu_node) = gnu_value; - } - else - gnu_node = tree_cons (gnu_purpose, gnu_value, *gnu_stack_ptr); - - *gnu_stack_ptr = gnu_node; -} - -static void -pop_stack (tree *gnu_stack_ptr) -{ - tree gnu_node = *gnu_stack_ptr; - - *gnu_stack_ptr = TREE_CHAIN (gnu_node); - TREE_CHAIN (gnu_node) = gnu_stack_free_list; - gnu_stack_free_list = gnu_node; -} - -/* Generate GIMPLE in place for the expression at *EXPR_P. */ - -int -gnat_gimplify_expr (tree *expr_p, gimple_seq *pre_p, - gimple_seq *post_p ATTRIBUTE_UNUSED) -{ - tree expr = *expr_p; - tree op; - - if (IS_ADA_STMT (expr)) - return gnat_gimplify_stmt (expr_p); - - switch (TREE_CODE (expr)) - { - case NULL_EXPR: - /* If this is for a scalar, just make a VAR_DECL for it. If for - an aggregate, get a null pointer of the appropriate type and - dereference it. */ - if (AGGREGATE_TYPE_P (TREE_TYPE (expr))) - *expr_p = build1 (INDIRECT_REF, TREE_TYPE (expr), - convert (build_pointer_type (TREE_TYPE (expr)), - integer_zero_node)); - else - { - *expr_p = create_tmp_var (TREE_TYPE (expr), NULL); - TREE_NO_WARNING (*expr_p) = 1; - } - - gimplify_and_add (TREE_OPERAND (expr, 0), pre_p); - return GS_OK; - - case UNCONSTRAINED_ARRAY_REF: - /* We should only do this if we are just elaborating for side-effects, - but we can't know that yet. */ - *expr_p = TREE_OPERAND (*expr_p, 0); - return GS_OK; - - case ADDR_EXPR: - op = TREE_OPERAND (expr, 0); - - /* If we're taking the address of a constant CONSTRUCTOR, force it to - be put into static memory. We know it's going to be readonly given - the semantics we have and it's required to be static memory in - the case when the reference is in an elaboration procedure. */ - if (TREE_CODE (op) == CONSTRUCTOR && TREE_CONSTANT (op)) - { - tree new_var = create_tmp_var (TREE_TYPE (op), "C"); - - TREE_READONLY (new_var) = 1; - TREE_STATIC (new_var) = 1; - TREE_ADDRESSABLE (new_var) = 1; - DECL_INITIAL (new_var) = op; - - TREE_OPERAND (expr, 0) = new_var; - recompute_tree_invariant_for_addr_expr (expr); - return GS_ALL_DONE; - } - - /* If we are taking the address of a SAVE_EXPR, we are typically - processing a misaligned argument to be passed by reference in a - procedure call. We just mark the operand as addressable + not - readonly here and let the common gimplifier code perform the - temporary creation, initialization, and "instantiation" in place of - the SAVE_EXPR in further operands, in particular in the copy back - code inserted after the call. */ - else if (TREE_CODE (op) == SAVE_EXPR) - { - TREE_ADDRESSABLE (op) = 1; - TREE_READONLY (op) = 0; - } - - /* We let the gimplifier process &COND_EXPR and expect it to yield the - address of the selected operand when it is addressable. Besides, we - also expect addressable_p to only let COND_EXPRs where both arms are - addressable reach here. */ - else if (TREE_CODE (op) == COND_EXPR) - ; - - /* Otherwise, if we are taking the address of something that is neither - reference, declaration, or constant, make a variable for the operand - here and then take its address. If we don't do it this way, we may - confuse the gimplifier because it needs to know the variable is - addressable at this point. This duplicates code in - internal_get_tmp_var, which is unfortunate. */ - else if (TREE_CODE_CLASS (TREE_CODE (op)) != tcc_reference - && TREE_CODE_CLASS (TREE_CODE (op)) != tcc_declaration - && TREE_CODE_CLASS (TREE_CODE (op)) != tcc_constant) - { - tree new_var = create_tmp_var (TREE_TYPE (op), "A"); - gimple stmt; - - TREE_ADDRESSABLE (new_var) = 1; - - stmt = gimplify_assign (new_var, op, pre_p); - if (EXPR_HAS_LOCATION (op)) - gimple_set_location (stmt, *EXPR_LOCUS (op)); - - TREE_OPERAND (expr, 0) = new_var; - recompute_tree_invariant_for_addr_expr (expr); - return GS_ALL_DONE; - } - - /* ... fall through ... */ - - default: - return GS_UNHANDLED; - } -} - -/* Generate GIMPLE in place for the statement at *STMT_P. */ - -static enum gimplify_status -gnat_gimplify_stmt (tree *stmt_p) -{ - tree stmt = *stmt_p; - - switch (TREE_CODE (stmt)) - { - case STMT_STMT: - *stmt_p = STMT_STMT_STMT (stmt); - return GS_OK; - - case LOOP_STMT: - { - tree gnu_start_label = create_artificial_label (); - tree gnu_end_label = LOOP_STMT_LABEL (stmt); - tree t; - - /* Set to emit the statements of the loop. */ - *stmt_p = NULL_TREE; - - /* We first emit the start label and then a conditional jump to - the end label if there's a top condition, then the body of the - loop, then a conditional branch to the end label, then the update, - if any, and finally a jump to the start label and the definition - of the end label. */ - append_to_statement_list (build1 (LABEL_EXPR, void_type_node, - gnu_start_label), - stmt_p); - - if (LOOP_STMT_TOP_COND (stmt)) - append_to_statement_list (build3 (COND_EXPR, void_type_node, - LOOP_STMT_TOP_COND (stmt), - alloc_stmt_list (), - build1 (GOTO_EXPR, - void_type_node, - gnu_end_label)), - stmt_p); - - append_to_statement_list (LOOP_STMT_BODY (stmt), stmt_p); - - if (LOOP_STMT_BOT_COND (stmt)) - append_to_statement_list (build3 (COND_EXPR, void_type_node, - LOOP_STMT_BOT_COND (stmt), - alloc_stmt_list (), - build1 (GOTO_EXPR, - void_type_node, - gnu_end_label)), - stmt_p); - - if (LOOP_STMT_UPDATE (stmt)) - append_to_statement_list (LOOP_STMT_UPDATE (stmt), stmt_p); - - t = build1 (GOTO_EXPR, void_type_node, gnu_start_label); - SET_EXPR_LOCATION (t, DECL_SOURCE_LOCATION (gnu_end_label)); - append_to_statement_list (t, stmt_p); - - append_to_statement_list (build1 (LABEL_EXPR, void_type_node, - gnu_end_label), - stmt_p); - return GS_OK; - } - - case EXIT_STMT: - /* Build a statement to jump to the corresponding end label, then - see if it needs to be conditional. */ - *stmt_p = build1 (GOTO_EXPR, void_type_node, EXIT_STMT_LABEL (stmt)); - if (EXIT_STMT_COND (stmt)) - *stmt_p = build3 (COND_EXPR, void_type_node, - EXIT_STMT_COND (stmt), *stmt_p, alloc_stmt_list ()); - return GS_OK; - - default: - gcc_unreachable (); - } -} - -/* Force references to each of the entities in packages withed by GNAT_NODE. - Operate recursively but check that we aren't elaborating something more - than once. - - This routine is exclusively called in type_annotate mode, to compute DDA - information for types in withed units, for ASIS use. */ - -static void -elaborate_all_entities (Node_Id gnat_node) -{ - Entity_Id gnat_with_clause, gnat_entity; - - /* Process each unit only once. As we trace the context of all relevant - units transitively, including generic bodies, we may encounter the - same generic unit repeatedly. */ - if (!present_gnu_tree (gnat_node)) - save_gnu_tree (gnat_node, integer_zero_node, true); - - /* Save entities in all context units. A body may have an implicit_with - on its own spec, if the context includes a child unit, so don't save - the spec twice. */ - for (gnat_with_clause = First (Context_Items (gnat_node)); - Present (gnat_with_clause); - gnat_with_clause = Next (gnat_with_clause)) - if (Nkind (gnat_with_clause) == N_With_Clause - && !present_gnu_tree (Library_Unit (gnat_with_clause)) - && Library_Unit (gnat_with_clause) != Library_Unit (Cunit (Main_Unit))) - { - elaborate_all_entities (Library_Unit (gnat_with_clause)); - - if (Ekind (Entity (Name (gnat_with_clause))) == E_Package) - { - for (gnat_entity = First_Entity (Entity (Name (gnat_with_clause))); - Present (gnat_entity); - gnat_entity = Next_Entity (gnat_entity)) - if (Is_Public (gnat_entity) - && Convention (gnat_entity) != Convention_Intrinsic - && Ekind (gnat_entity) != E_Package - && Ekind (gnat_entity) != E_Package_Body - && Ekind (gnat_entity) != E_Operator - && !(IN (Ekind (gnat_entity), Type_Kind) - && !Is_Frozen (gnat_entity)) - && !((Ekind (gnat_entity) == E_Procedure - || Ekind (gnat_entity) == E_Function) - && Is_Intrinsic_Subprogram (gnat_entity)) - && !IN (Ekind (gnat_entity), Named_Kind) - && !IN (Ekind (gnat_entity), Generic_Unit_Kind)) - gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0); - } - else if (Ekind (Entity (Name (gnat_with_clause))) == E_Generic_Package) - { - Node_Id gnat_body - = Corresponding_Body (Unit (Library_Unit (gnat_with_clause))); - - /* Retrieve compilation unit node of generic body. */ - while (Present (gnat_body) - && Nkind (gnat_body) != N_Compilation_Unit) - gnat_body = Parent (gnat_body); - - /* If body is available, elaborate its context. */ - if (Present (gnat_body)) - elaborate_all_entities (gnat_body); - } - } - - if (Nkind (Unit (gnat_node)) == N_Package_Body) - elaborate_all_entities (Library_Unit (gnat_node)); -} - -/* Do the processing of N_Freeze_Entity, GNAT_NODE. */ - -static void -process_freeze_entity (Node_Id gnat_node) -{ - Entity_Id gnat_entity = Entity (gnat_node); - tree gnu_old; - tree gnu_new; - tree gnu_init - = (Nkind (Declaration_Node (gnat_entity)) == N_Object_Declaration - && present_gnu_tree (Declaration_Node (gnat_entity))) - ? get_gnu_tree (Declaration_Node (gnat_entity)) : NULL_TREE; - - /* If this is a package, need to generate code for the package. */ - if (Ekind (gnat_entity) == E_Package) - { - insert_code_for - (Parent (Corresponding_Body - (Parent (Declaration_Node (gnat_entity))))); - return; - } - - /* Check for old definition after the above call. This Freeze_Node - might be for one its Itypes. */ - gnu_old - = present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity) : 0; - - /* If this entity has an Address representation clause, GNU_OLD is the - address, so discard it here. */ - if (Present (Address_Clause (gnat_entity))) - gnu_old = 0; - - /* Don't do anything for class-wide types they are always - transformed into their root type. */ - if (Ekind (gnat_entity) == E_Class_Wide_Type - || (Ekind (gnat_entity) == E_Class_Wide_Subtype - && Present (Equivalent_Type (gnat_entity)))) - return; - - /* Don't do anything for subprograms that may have been elaborated before - their freeze nodes. This can happen, for example because of an inner call - in an instance body, or a previous compilation of a spec for inlining - purposes. */ - if (gnu_old - && ((TREE_CODE (gnu_old) == FUNCTION_DECL - && (Ekind (gnat_entity) == E_Function - || Ekind (gnat_entity) == E_Procedure)) - || (gnu_old - && TREE_CODE (TREE_TYPE (gnu_old)) == FUNCTION_TYPE - && Ekind (gnat_entity) == E_Subprogram_Type))) - return; - - /* If we have a non-dummy type old tree, we have nothing to do, except - aborting if this is the public view of a private type whose full view was - not delayed, as this node was never delayed as it should have been. We - let this happen for concurrent types and their Corresponding_Record_Type, - however, because each might legitimately be elaborated before it's own - freeze node, e.g. while processing the other. */ - if (gnu_old - && !(TREE_CODE (gnu_old) == TYPE_DECL - && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old)))) - { - gcc_assert ((IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind) - && Present (Full_View (gnat_entity)) - && No (Freeze_Node (Full_View (gnat_entity)))) - || Is_Concurrent_Type (gnat_entity) - || (IN (Ekind (gnat_entity), Record_Kind) - && Is_Concurrent_Record_Type (gnat_entity))); - return; - } - - /* Reset the saved tree, if any, and elaborate the object or type for real. - If there is a full declaration, elaborate it and copy the type to - GNAT_ENTITY. Likewise if this is the record subtype corresponding to - a class wide type or subtype. */ - if (gnu_old) - { - save_gnu_tree (gnat_entity, NULL_TREE, false); - if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind) - && Present (Full_View (gnat_entity)) - && present_gnu_tree (Full_View (gnat_entity))) - save_gnu_tree (Full_View (gnat_entity), NULL_TREE, false); - if (Present (Class_Wide_Type (gnat_entity)) - && Class_Wide_Type (gnat_entity) != gnat_entity) - save_gnu_tree (Class_Wide_Type (gnat_entity), NULL_TREE, false); - } - - if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind) - && Present (Full_View (gnat_entity))) - { - gnu_new = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 1); - - /* Propagate back-annotations from full view to partial view. */ - if (Unknown_Alignment (gnat_entity)) - Set_Alignment (gnat_entity, Alignment (Full_View (gnat_entity))); - - if (Unknown_Esize (gnat_entity)) - Set_Esize (gnat_entity, Esize (Full_View (gnat_entity))); - - if (Unknown_RM_Size (gnat_entity)) - Set_RM_Size (gnat_entity, RM_Size (Full_View (gnat_entity))); - - /* The above call may have defined this entity (the simplest example - of this is when we have a private enumeral type since the bounds - will have the public view. */ - if (!present_gnu_tree (gnat_entity)) - save_gnu_tree (gnat_entity, gnu_new, false); - if (Present (Class_Wide_Type (gnat_entity)) - && Class_Wide_Type (gnat_entity) != gnat_entity) - save_gnu_tree (Class_Wide_Type (gnat_entity), gnu_new, false); - } - else - gnu_new = gnat_to_gnu_entity (gnat_entity, gnu_init, 1); - - /* If we've made any pointers to the old version of this type, we - have to update them. */ - if (gnu_old) - update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)), - TREE_TYPE (gnu_new)); -} - -/* Process the list of inlined subprograms of GNAT_NODE, which is an - N_Compilation_Unit. */ - -static void -process_inlined_subprograms (Node_Id gnat_node) -{ - Entity_Id gnat_entity; - Node_Id gnat_body; - - /* If we can inline, generate Gimple for all the inlined subprograms. - Define the entity first so we set DECL_EXTERNAL. */ - if (optimize > 0) - for (gnat_entity = First_Inlined_Subprogram (gnat_node); - Present (gnat_entity); - gnat_entity = Next_Inlined_Subprogram (gnat_entity)) - { - gnat_body = Parent (Declaration_Node (gnat_entity)); - - if (Nkind (gnat_body) != N_Subprogram_Body) - { - /* ??? This really should always be Present. */ - if (No (Corresponding_Body (gnat_body))) - continue; - - gnat_body - = Parent (Declaration_Node (Corresponding_Body (gnat_body))); - } - - if (Present (gnat_body)) - { - gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0); - add_stmt (gnat_to_gnu (gnat_body)); - } - } -} - -/* Elaborate decls in the lists GNAT_DECLS and GNAT_DECLS2, if present. - We make two passes, one to elaborate anything other than bodies (but - we declare a function if there was no spec). The second pass - elaborates the bodies. - - GNAT_END_LIST gives the element in the list past the end. Normally, - this is Empty, but can be First_Real_Statement for a - Handled_Sequence_Of_Statements. - - We make a complete pass through both lists if PASS1P is true, then make - the second pass over both lists if PASS2P is true. The lists usually - correspond to the public and private parts of a package. */ - -static void -process_decls (List_Id gnat_decls, List_Id gnat_decls2, - Node_Id gnat_end_list, bool pass1p, bool pass2p) -{ - List_Id gnat_decl_array[2]; - Node_Id gnat_decl; - int i; - - gnat_decl_array[0] = gnat_decls, gnat_decl_array[1] = gnat_decls2; - - if (pass1p) - for (i = 0; i <= 1; i++) - if (Present (gnat_decl_array[i])) - for (gnat_decl = First (gnat_decl_array[i]); - gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl)) - { - /* For package specs, we recurse inside the declarations, - thus taking the two pass approach inside the boundary. */ - if (Nkind (gnat_decl) == N_Package_Declaration - && (Nkind (Specification (gnat_decl) - == N_Package_Specification))) - process_decls (Visible_Declarations (Specification (gnat_decl)), - Private_Declarations (Specification (gnat_decl)), - Empty, true, false); - - /* Similarly for any declarations in the actions of a - freeze node. */ - else if (Nkind (gnat_decl) == N_Freeze_Entity) - { - process_freeze_entity (gnat_decl); - process_decls (Actions (gnat_decl), Empty, Empty, true, false); - } - - /* Package bodies with freeze nodes get their elaboration deferred - until the freeze node, but the code must be placed in the right - place, so record the code position now. */ - else if (Nkind (gnat_decl) == N_Package_Body - && Present (Freeze_Node (Corresponding_Spec (gnat_decl)))) - record_code_position (gnat_decl); - - else if (Nkind (gnat_decl) == N_Package_Body_Stub - && Present (Library_Unit (gnat_decl)) - && Present (Freeze_Node - (Corresponding_Spec - (Proper_Body (Unit - (Library_Unit (gnat_decl))))))) - record_code_position - (Proper_Body (Unit (Library_Unit (gnat_decl)))); - - /* We defer most subprogram bodies to the second pass. */ - else if (Nkind (gnat_decl) == N_Subprogram_Body) - { - if (Acts_As_Spec (gnat_decl)) - { - Node_Id gnat_subprog_id = Defining_Entity (gnat_decl); - - if (Ekind (gnat_subprog_id) != E_Generic_Procedure - && Ekind (gnat_subprog_id) != E_Generic_Function) - gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, 1); - } - } - /* For bodies and stubs that act as their own specs, the entity - itself must be elaborated in the first pass, because it may - be used in other declarations. */ - else if (Nkind (gnat_decl) == N_Subprogram_Body_Stub) - { - Node_Id gnat_subprog_id = - Defining_Entity (Specification (gnat_decl)); - - if (Ekind (gnat_subprog_id) != E_Subprogram_Body - && Ekind (gnat_subprog_id) != E_Generic_Procedure - && Ekind (gnat_subprog_id) != E_Generic_Function) - gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, 1); - } - - /* Concurrent stubs stand for the corresponding subprogram bodies, - which are deferred like other bodies. */ - else if (Nkind (gnat_decl) == N_Task_Body_Stub - || Nkind (gnat_decl) == N_Protected_Body_Stub) - ; - else - add_stmt (gnat_to_gnu (gnat_decl)); - } - - /* Here we elaborate everything we deferred above except for package bodies, - which are elaborated at their freeze nodes. Note that we must also - go inside things (package specs and freeze nodes) the first pass did. */ - if (pass2p) - for (i = 0; i <= 1; i++) - if (Present (gnat_decl_array[i])) - for (gnat_decl = First (gnat_decl_array[i]); - gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl)) - { - if (Nkind (gnat_decl) == N_Subprogram_Body - || Nkind (gnat_decl) == N_Subprogram_Body_Stub - || Nkind (gnat_decl) == N_Task_Body_Stub - || Nkind (gnat_decl) == N_Protected_Body_Stub) - add_stmt (gnat_to_gnu (gnat_decl)); - - else if (Nkind (gnat_decl) == N_Package_Declaration - && (Nkind (Specification (gnat_decl) - == N_Package_Specification))) - process_decls (Visible_Declarations (Specification (gnat_decl)), - Private_Declarations (Specification (gnat_decl)), - Empty, false, true); - - else if (Nkind (gnat_decl) == N_Freeze_Entity) - process_decls (Actions (gnat_decl), Empty, Empty, false, true); - } -} - -/* Make a unary operation of kind CODE using build_unary_op, but guard - the operation by an overflow check. CODE can be one of NEGATE_EXPR - or ABS_EXPR. GNU_TYPE is the type desired for the result. Usually - the operation is to be performed in that type. */ - -static tree -build_unary_op_trapv (enum tree_code code, tree gnu_type, tree operand) -{ - gcc_assert (code == NEGATE_EXPR || code == ABS_EXPR); - - operand = protect_multiple_eval (operand); - - return emit_check (build_binary_op (EQ_EXPR, integer_type_node, - operand, TYPE_MIN_VALUE (gnu_type)), - build_unary_op (code, gnu_type, operand), - CE_Overflow_Check_Failed); -} - -/* Make a binary operation of kind CODE using build_binary_op, but guard - the operation by an overflow check. CODE can be one of PLUS_EXPR, - MINUS_EXPR or MULT_EXPR. GNU_TYPE is the type desired for the result. - Usually the operation is to be performed in that type. */ - -static tree -build_binary_op_trapv (enum tree_code code, tree gnu_type, tree left, - tree right) -{ - tree lhs = protect_multiple_eval (left); - tree rhs = protect_multiple_eval (right); - tree type_max = TYPE_MAX_VALUE (gnu_type); - tree type_min = TYPE_MIN_VALUE (gnu_type); - tree gnu_expr; - tree tmp1, tmp2; - tree zero = convert (gnu_type, integer_zero_node); - tree rhs_lt_zero; - tree check_pos; - tree check_neg; - tree check; - int precision = TYPE_PRECISION (gnu_type); - - gcc_assert (!(precision & (precision - 1))); /* ensure power of 2 */ - - /* Prefer a constant or known-positive rhs to simplify checks. */ - if (!TREE_CONSTANT (rhs) - && commutative_tree_code (code) - && (TREE_CONSTANT (lhs) || (!tree_expr_nonnegative_p (rhs) - && tree_expr_nonnegative_p (lhs)))) - { - tree tmp = lhs; - lhs = rhs; - rhs = tmp; - } - - rhs_lt_zero = tree_expr_nonnegative_p (rhs) - ? integer_zero_node - : build_binary_op (LT_EXPR, integer_type_node, rhs, zero); - - /* ??? Should use more efficient check for operand_equal_p (lhs, rhs, 0) */ - - /* Try a few strategies that may be cheaper than the general - code at the end of the function, if the rhs is not known. - The strategies are: - - Call library function for 64-bit multiplication (complex) - - Widen, if input arguments are sufficiently small - - Determine overflow using wrapped result for addition/subtraction. */ - - if (!TREE_CONSTANT (rhs)) - { - /* Even for add/subtract double size to get another base type. */ - int needed_precision = precision * 2; - - if (code == MULT_EXPR && precision == 64) - { - tree int_64 = gnat_type_for_size (64, 0); - - return convert (gnu_type, build_call_2_expr (mulv64_decl, - convert (int_64, lhs), - convert (int_64, rhs))); - } - - else if (needed_precision <= BITS_PER_WORD - || (code == MULT_EXPR - && needed_precision <= LONG_LONG_TYPE_SIZE)) - { - tree wide_type = gnat_type_for_size (needed_precision, 0); - - tree wide_result = build_binary_op (code, wide_type, - convert (wide_type, lhs), - convert (wide_type, rhs)); - - tree check = build_binary_op - (TRUTH_ORIF_EXPR, integer_type_node, - build_binary_op (LT_EXPR, integer_type_node, wide_result, - convert (wide_type, type_min)), - build_binary_op (GT_EXPR, integer_type_node, wide_result, - convert (wide_type, type_max))); - - tree result = convert (gnu_type, wide_result); - - return emit_check (check, result, CE_Overflow_Check_Failed); - } - - else if (code == PLUS_EXPR || code == MINUS_EXPR) - { - tree unsigned_type = gnat_type_for_size (precision, 1); - tree wrapped_expr = convert - (gnu_type, build_binary_op (code, unsigned_type, - convert (unsigned_type, lhs), - convert (unsigned_type, rhs))); - - tree result = convert - (gnu_type, build_binary_op (code, gnu_type, lhs, rhs)); - - /* Overflow when (rhs < 0) ^ (wrapped_expr < lhs)), for addition - or when (rhs < 0) ^ (wrapped_expr > lhs) for subtraction. */ - tree check = build_binary_op - (TRUTH_XOR_EXPR, integer_type_node, rhs_lt_zero, - build_binary_op (code == PLUS_EXPR ? LT_EXPR : GT_EXPR, - integer_type_node, wrapped_expr, lhs)); - - return emit_check (check, result, CE_Overflow_Check_Failed); - } - } - - switch (code) - { - case PLUS_EXPR: - /* When rhs >= 0, overflow when lhs > type_max - rhs. */ - check_pos = build_binary_op (GT_EXPR, integer_type_node, lhs, - build_binary_op (MINUS_EXPR, gnu_type, - type_max, rhs)), - - /* When rhs < 0, overflow when lhs < type_min - rhs. */ - check_neg = build_binary_op (LT_EXPR, integer_type_node, lhs, - build_binary_op (MINUS_EXPR, gnu_type, - type_min, rhs)); - break; - - case MINUS_EXPR: - /* When rhs >= 0, overflow when lhs < type_min + rhs. */ - check_pos = build_binary_op (LT_EXPR, integer_type_node, lhs, - build_binary_op (PLUS_EXPR, gnu_type, - type_min, rhs)), - - /* When rhs < 0, overflow when lhs > type_max + rhs. */ - check_neg = build_binary_op (GT_EXPR, integer_type_node, lhs, - build_binary_op (PLUS_EXPR, gnu_type, - type_max, rhs)); - break; - - case MULT_EXPR: - /* The check here is designed to be efficient if the rhs is constant, - but it will work for any rhs by using integer division. - Four different check expressions determine wether X * C overflows, - depending on C. - C == 0 => false - C > 0 => X > type_max / C || X < type_min / C - C == -1 => X == type_min - C < -1 => X > type_min / C || X < type_max / C */ - - tmp1 = build_binary_op (TRUNC_DIV_EXPR, gnu_type, type_max, rhs); - tmp2 = build_binary_op (TRUNC_DIV_EXPR, gnu_type, type_min, rhs); - - check_pos = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node, - build_binary_op (NE_EXPR, integer_type_node, zero, rhs), - build_binary_op (TRUTH_ORIF_EXPR, integer_type_node, - build_binary_op (GT_EXPR, integer_type_node, lhs, tmp1), - build_binary_op (LT_EXPR, integer_type_node, lhs, tmp2))); - - check_neg = fold_build3 (COND_EXPR, integer_type_node, - build_binary_op (EQ_EXPR, integer_type_node, rhs, - build_int_cst (gnu_type, -1)), - build_binary_op (EQ_EXPR, integer_type_node, lhs, type_min), - build_binary_op (TRUTH_ORIF_EXPR, integer_type_node, - build_binary_op (GT_EXPR, integer_type_node, lhs, tmp2), - build_binary_op (LT_EXPR, integer_type_node, lhs, tmp1))); - break; - - default: - gcc_unreachable(); - } - - gnu_expr = build_binary_op (code, gnu_type, lhs, rhs); - - /* If we can fold the expression to a constant, just return it. - The caller will deal with overflow, no need to generate a check. */ - if (TREE_CONSTANT (gnu_expr)) - return gnu_expr; - - check = fold_build3 (COND_EXPR, integer_type_node, - rhs_lt_zero, check_neg, check_pos); - - return emit_check (check, gnu_expr, CE_Overflow_Check_Failed); -} - -/* Emit code for a range check. GNU_EXPR is the expression to be checked, - GNAT_RANGE_TYPE the gnat type or subtype containing the bounds against - which we have to check. */ - -static tree -emit_range_check (tree gnu_expr, Entity_Id gnat_range_type) -{ - tree gnu_range_type = get_unpadded_type (gnat_range_type); - tree gnu_low = TYPE_MIN_VALUE (gnu_range_type); - tree gnu_high = TYPE_MAX_VALUE (gnu_range_type); - tree gnu_compare_type = get_base_type (TREE_TYPE (gnu_expr)); - - /* If GNU_EXPR has GNAT_RANGE_TYPE as its base type, no check is needed. - This can for example happen when translating 'Val or 'Value. */ - if (gnu_compare_type == gnu_range_type) - return gnu_expr; - - /* If GNU_EXPR has an integral type that is narrower than GNU_RANGE_TYPE, - we can't do anything since we might be truncating the bounds. No - check is needed in this case. */ - if (INTEGRAL_TYPE_P (TREE_TYPE (gnu_expr)) - && (TYPE_PRECISION (gnu_compare_type) - < TYPE_PRECISION (get_base_type (gnu_range_type)))) - return gnu_expr; - - /* Checked expressions must be evaluated only once. */ - gnu_expr = protect_multiple_eval (gnu_expr); - - /* There's no good type to use here, so we might as well use - integer_type_node. Note that the form of the check is - (not (expr >= lo)) or (not (expr <= hi)) - the reason for this slightly convoluted form is that NaNs - are not considered to be in range in the float case. */ - return emit_check - (build_binary_op (TRUTH_ORIF_EXPR, integer_type_node, - invert_truthvalue - (build_binary_op (GE_EXPR, integer_type_node, - convert (gnu_compare_type, gnu_expr), - convert (gnu_compare_type, gnu_low))), - invert_truthvalue - (build_binary_op (LE_EXPR, integer_type_node, - convert (gnu_compare_type, gnu_expr), - convert (gnu_compare_type, - gnu_high)))), - gnu_expr, CE_Range_Check_Failed); -} - -/* Emit code for an index check. GNU_ARRAY_OBJECT is the array object - which we are about to index, GNU_EXPR is the index expression to be - checked, GNU_LOW and GNU_HIGH are the lower and upper bounds - against which GNU_EXPR has to be checked. Note that for index - checking we cannot use the emit_range_check function (although very - similar code needs to be generated in both cases) since for index - checking the array type against which we are checking the indices - may be unconstrained and consequently we need to retrieve the - actual index bounds from the array object itself - (GNU_ARRAY_OBJECT). The place where we need to do that is in - subprograms having unconstrained array formal parameters */ - -static tree -emit_index_check (tree gnu_array_object, - tree gnu_expr, - tree gnu_low, - tree gnu_high) -{ - tree gnu_expr_check; - - /* Checked expressions must be evaluated only once. */ - gnu_expr = protect_multiple_eval (gnu_expr); - - /* Must do this computation in the base type in case the expression's - type is an unsigned subtypes. */ - gnu_expr_check = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr); - - /* If GNU_LOW or GNU_HIGH are a PLACEHOLDER_EXPR, qualify them by - the object we are handling. */ - gnu_low = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_low, gnu_array_object); - gnu_high = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_high, gnu_array_object); - - /* There's no good type to use here, so we might as well use - integer_type_node. */ - return emit_check - (build_binary_op (TRUTH_ORIF_EXPR, integer_type_node, - build_binary_op (LT_EXPR, integer_type_node, - gnu_expr_check, - convert (TREE_TYPE (gnu_expr_check), - gnu_low)), - build_binary_op (GT_EXPR, integer_type_node, - gnu_expr_check, - convert (TREE_TYPE (gnu_expr_check), - gnu_high))), - gnu_expr, CE_Index_Check_Failed); -} - -/* GNU_COND contains the condition corresponding to an access, discriminant or - range check of value GNU_EXPR. Build a COND_EXPR that returns GNU_EXPR if - GNU_COND is false and raises a CONSTRAINT_ERROR if GNU_COND is true. - REASON is the code that says why the exception was raised. */ - -static tree -emit_check (tree gnu_cond, tree gnu_expr, int reason) -{ - tree gnu_call = build_call_raise (reason, Empty, N_Raise_Constraint_Error); - tree gnu_result - = fold_build3 (COND_EXPR, TREE_TYPE (gnu_expr), gnu_cond, - build2 (COMPOUND_EXPR, TREE_TYPE (gnu_expr), gnu_call, - convert (TREE_TYPE (gnu_expr), integer_zero_node)), - gnu_expr); - - /* GNU_RESULT has side effects if and only if GNU_EXPR has: - we don't need to evaluate it just for the check. */ - TREE_SIDE_EFFECTS (gnu_result) = TREE_SIDE_EFFECTS (gnu_expr); - - /* ??? Unfortunately, if we don't put a SAVE_EXPR around this whole thing, - we will repeatedly do the test and, at compile time, we will repeatedly - visit it during unsharing, which leads to an exponential explosion. */ - return save_expr (gnu_result); -} - -/* Return an expression that converts GNU_EXPR to GNAT_TYPE, doing - overflow checks if OVERFLOW_P is nonzero and range checks if - RANGE_P is nonzero. GNAT_TYPE is known to be an integral type. - If TRUNCATE_P is nonzero, do a float to integer conversion with - truncation; otherwise round. */ - -static tree -convert_with_check (Entity_Id gnat_type, tree gnu_expr, bool overflowp, - bool rangep, bool truncatep) -{ - tree gnu_type = get_unpadded_type (gnat_type); - tree gnu_in_type = TREE_TYPE (gnu_expr); - tree gnu_in_basetype = get_base_type (gnu_in_type); - tree gnu_base_type = get_base_type (gnu_type); - tree gnu_result = gnu_expr; - - /* If we are not doing any checks, the output is an integral type, and - the input is not a floating type, just do the conversion. This - shortcut is required to avoid problems with packed array types - and simplifies code in all cases anyway. */ - if (!rangep && !overflowp && INTEGRAL_TYPE_P (gnu_base_type) - && !FLOAT_TYPE_P (gnu_in_type)) - return convert (gnu_type, gnu_expr); - - /* First convert the expression to its base type. This - will never generate code, but makes the tests below much simpler. - But don't do this if converting from an integer type to an unconstrained - array type since then we need to get the bounds from the original - (unpacked) type. */ - if (TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE) - gnu_result = convert (gnu_in_basetype, gnu_result); - - /* If overflow checks are requested, we need to be sure the result will - fit in the output base type. But don't do this if the input - is integer and the output floating-point. */ - if (overflowp - && !(FLOAT_TYPE_P (gnu_base_type) && INTEGRAL_TYPE_P (gnu_in_basetype))) - { - /* Ensure GNU_EXPR only gets evaluated once. */ - tree gnu_input = protect_multiple_eval (gnu_result); - tree gnu_cond = integer_zero_node; - tree gnu_in_lb = TYPE_MIN_VALUE (gnu_in_basetype); - tree gnu_in_ub = TYPE_MAX_VALUE (gnu_in_basetype); - tree gnu_out_lb = TYPE_MIN_VALUE (gnu_base_type); - tree gnu_out_ub = TYPE_MAX_VALUE (gnu_base_type); - - /* Convert the lower bounds to signed types, so we're sure we're - comparing them properly. Likewise, convert the upper bounds - to unsigned types. */ - if (INTEGRAL_TYPE_P (gnu_in_basetype) && TYPE_UNSIGNED (gnu_in_basetype)) - gnu_in_lb = convert (gnat_signed_type (gnu_in_basetype), gnu_in_lb); - - if (INTEGRAL_TYPE_P (gnu_in_basetype) - && !TYPE_UNSIGNED (gnu_in_basetype)) - gnu_in_ub = convert (gnat_unsigned_type (gnu_in_basetype), gnu_in_ub); - - if (INTEGRAL_TYPE_P (gnu_base_type) && TYPE_UNSIGNED (gnu_base_type)) - gnu_out_lb = convert (gnat_signed_type (gnu_base_type), gnu_out_lb); - - if (INTEGRAL_TYPE_P (gnu_base_type) && !TYPE_UNSIGNED (gnu_base_type)) - gnu_out_ub = convert (gnat_unsigned_type (gnu_base_type), gnu_out_ub); - - /* Check each bound separately and only if the result bound - is tighter than the bound on the input type. Note that all the - types are base types, so the bounds must be constant. Also, - the comparison is done in the base type of the input, which - always has the proper signedness. First check for input - integer (which means output integer), output float (which means - both float), or mixed, in which case we always compare. - Note that we have to do the comparison which would *fail* in the - case of an error since if it's an FP comparison and one of the - values is a NaN or Inf, the comparison will fail. */ - if (INTEGRAL_TYPE_P (gnu_in_basetype) - ? tree_int_cst_lt (gnu_in_lb, gnu_out_lb) - : (FLOAT_TYPE_P (gnu_base_type) - ? REAL_VALUES_LESS (TREE_REAL_CST (gnu_in_lb), - TREE_REAL_CST (gnu_out_lb)) - : 1)) - gnu_cond - = invert_truthvalue - (build_binary_op (GE_EXPR, integer_type_node, - gnu_input, convert (gnu_in_basetype, - gnu_out_lb))); - - if (INTEGRAL_TYPE_P (gnu_in_basetype) - ? tree_int_cst_lt (gnu_out_ub, gnu_in_ub) - : (FLOAT_TYPE_P (gnu_base_type) - ? REAL_VALUES_LESS (TREE_REAL_CST (gnu_out_ub), - TREE_REAL_CST (gnu_in_lb)) - : 1)) - gnu_cond - = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node, gnu_cond, - invert_truthvalue - (build_binary_op (LE_EXPR, integer_type_node, - gnu_input, - convert (gnu_in_basetype, - gnu_out_ub)))); - - if (!integer_zerop (gnu_cond)) - gnu_result = emit_check (gnu_cond, gnu_input, - CE_Overflow_Check_Failed); - } - - /* Now convert to the result base type. If this is a non-truncating - float-to-integer conversion, round. */ - if (INTEGRAL_TYPE_P (gnu_base_type) && FLOAT_TYPE_P (gnu_in_basetype) - && !truncatep) - { - REAL_VALUE_TYPE half_minus_pred_half, pred_half; - tree gnu_conv, gnu_zero, gnu_comp, gnu_saved_result, calc_type; - tree gnu_pred_half, gnu_add_pred_half, gnu_subtract_pred_half; - const struct real_format *fmt; - - /* The following calculations depend on proper rounding to even - of each arithmetic operation. In order to prevent excess - precision from spoiling this property, use the widest hardware - floating-point type if FP_ARITH_MAY_WIDEN is true. */ - - calc_type = (FP_ARITH_MAY_WIDEN ? longest_float_type_node - : gnu_in_basetype); - - /* FIXME: Should not have padding in the first place */ - if (TREE_CODE (calc_type) == RECORD_TYPE - && TYPE_IS_PADDING_P (calc_type)) - calc_type = TREE_TYPE (TYPE_FIELDS (calc_type)); - - /* Compute the exact value calc_type'Pred (0.5) at compile time. */ - fmt = REAL_MODE_FORMAT (TYPE_MODE (calc_type)); - real_2expN (&half_minus_pred_half, -(fmt->p) - 1, TYPE_MODE (calc_type)); - REAL_ARITHMETIC (pred_half, MINUS_EXPR, dconsthalf, - half_minus_pred_half); - gnu_pred_half = build_real (calc_type, pred_half); - - /* If the input is strictly negative, subtract this value - and otherwise add it from the input. For 0.5, the result - is exactly between 1.0 and the machine number preceding 1.0 - (for calc_type). Since the last bit of 1.0 is even, this 0.5 - will round to 1.0, while all other number with an absolute - value less than 0.5 round to 0.0. For larger numbers exactly - halfway between integers, rounding will always be correct as - the true mathematical result will be closer to the higher - integer compared to the lower one. So, this constant works - for all floating-point numbers. - - The reason to use the same constant with subtract/add instead - of a positive and negative constant is to allow the comparison - to be scheduled in parallel with retrieval of the constant and - conversion of the input to the calc_type (if necessary). - */ - - gnu_zero = convert (gnu_in_basetype, integer_zero_node); - gnu_saved_result = save_expr (gnu_result); - gnu_conv = convert (calc_type, gnu_saved_result); - gnu_comp = build2 (GE_EXPR, integer_type_node, - gnu_saved_result, gnu_zero); - gnu_add_pred_half - = build2 (PLUS_EXPR, calc_type, gnu_conv, gnu_pred_half); - gnu_subtract_pred_half - = build2 (MINUS_EXPR, calc_type, gnu_conv, gnu_pred_half); - gnu_result = build3 (COND_EXPR, calc_type, gnu_comp, - gnu_add_pred_half, gnu_subtract_pred_half); - } - - if (TREE_CODE (gnu_base_type) == INTEGER_TYPE - && TYPE_HAS_ACTUAL_BOUNDS_P (gnu_base_type) - && TREE_CODE (gnu_result) == UNCONSTRAINED_ARRAY_REF) - gnu_result = unchecked_convert (gnu_base_type, gnu_result, false); - else - gnu_result = convert (gnu_base_type, gnu_result); - - /* Finally, do the range check if requested. Note that if the - result type is a modular type, the range check is actually - an overflow check. */ - - if (rangep - || (TREE_CODE (gnu_base_type) == INTEGER_TYPE - && TYPE_MODULAR_P (gnu_base_type) && overflowp)) - gnu_result = emit_range_check (gnu_result, gnat_type); - - return convert (gnu_type, gnu_result); -} - -/* Return true if TYPE is a smaller packable version of RECORD_TYPE. */ - -static bool -smaller_packable_type_p (tree type, tree record_type) -{ - tree size, rsize; - - /* We're not interested in variants here. */ - if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (record_type)) - return false; - - /* Like a variant, a packable version keeps the original TYPE_NAME. */ - if (TYPE_NAME (type) != TYPE_NAME (record_type)) - return false; - - size = TYPE_SIZE (type); - rsize = TYPE_SIZE (record_type); - - if (!(TREE_CODE (size) == INTEGER_CST && TREE_CODE (rsize) == INTEGER_CST)) - return false; - - return tree_int_cst_lt (size, rsize) != 0; -} - -/* Return true if GNU_EXPR can be directly addressed. This is the case - unless it is an expression involving computation or if it involves a - reference to a bitfield or to an object not sufficiently aligned for - its type. If GNU_TYPE is non-null, return true only if GNU_EXPR can - be directly addressed as an object of this type. - - *** Notes on addressability issues in the Ada compiler *** - - This predicate is necessary in order to bridge the gap between Gigi - and the middle-end about addressability of GENERIC trees. A tree - is said to be addressable if it can be directly addressed, i.e. if - its address can be taken, is a multiple of the type's alignment on - strict-alignment architectures and returns the first storage unit - assigned to the object represented by the tree. - - In the C family of languages, everything is in practice addressable - at the language level, except for bit-fields. This means that these - compilers will take the address of any tree that doesn't represent - a bit-field reference and expect the result to be the first storage - unit assigned to the object. Even in cases where this will result - in unaligned accesses at run time, nothing is supposed to be done - and the program is considered as erroneous instead (see PR c/18287). - - The implicit assumptions made in the middle-end are in keeping with - the C viewpoint described above: - - the address of a bit-field reference is supposed to be never - taken; the compiler (generally) will stop on such a construct, - - any other tree is addressable if it is formally addressable, - i.e. if it is formally allowed to be the operand of ADDR_EXPR. - - In Ada, the viewpoint is the opposite one: nothing is addressable - at the language level unless explicitly declared so. This means - that the compiler will both make sure that the trees representing - references to addressable ("aliased" in Ada parlance) objects are - addressable and make no real attempts at ensuring that the trees - representing references to non-addressable objects are addressable. - - In the first case, Ada is effectively equivalent to C and handing - down the direct result of applying ADDR_EXPR to these trees to the - middle-end works flawlessly. In the second case, Ada cannot afford - to consider the program as erroneous if the address of trees that - are not addressable is requested for technical reasons, unlike C; - as a consequence, the Ada compiler must arrange for either making - sure that this address is not requested in the middle-end or for - compensating by inserting temporaries if it is requested in Gigi. - - The first goal can be achieved because the middle-end should not - request the address of non-addressable trees on its own; the only - exception is for the invocation of low-level block operations like - memcpy, for which the addressability requirements are lower since - the type's alignment can be disregarded. In practice, this means - that Gigi must make sure that such operations cannot be applied to - non-BLKmode bit-fields. - - The second goal is achieved by means of the addressable_p predicate - and by inserting SAVE_EXPRs around trees deemed non-addressable. - They will be turned during gimplification into proper temporaries - whose address will be used in lieu of that of the original tree. */ - -static bool -addressable_p (tree gnu_expr, tree gnu_type) -{ - /* The size of the real type of the object must not be smaller than - that of the expected type, otherwise an indirect access in the - latter type would be larger than the object. Only records need - to be considered in practice. */ - if (gnu_type - && TREE_CODE (gnu_type) == RECORD_TYPE - && smaller_packable_type_p (TREE_TYPE (gnu_expr), gnu_type)) - return false; - - switch (TREE_CODE (gnu_expr)) - { - case VAR_DECL: - case PARM_DECL: - case FUNCTION_DECL: - case RESULT_DECL: - /* All DECLs are addressable: if they are in a register, we can force - them to memory. */ - return true; - - case UNCONSTRAINED_ARRAY_REF: - case INDIRECT_REF: - case CONSTRUCTOR: - case STRING_CST: - case INTEGER_CST: - case NULL_EXPR: - case SAVE_EXPR: - case CALL_EXPR: - return true; - - case COND_EXPR: - /* We accept &COND_EXPR as soon as both operands are addressable and - expect the outcome to be the address of the selected operand. */ - return (addressable_p (TREE_OPERAND (gnu_expr, 1), NULL_TREE) - && addressable_p (TREE_OPERAND (gnu_expr, 2), NULL_TREE)); - - case COMPONENT_REF: - return (((!DECL_BIT_FIELD (TREE_OPERAND (gnu_expr, 1)) - /* Even with DECL_BIT_FIELD cleared, we have to ensure that - the field is sufficiently aligned, in case it is subject - to a pragma Component_Alignment. But we don't need to - check the alignment of the containing record, as it is - guaranteed to be not smaller than that of its most - aligned field that is not a bit-field. */ - && (!STRICT_ALIGNMENT - || DECL_ALIGN (TREE_OPERAND (gnu_expr, 1)) - >= TYPE_ALIGN (TREE_TYPE (gnu_expr)))) - /* The field of a padding record is always addressable. */ - || TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_expr, 0)))) - && addressable_p (TREE_OPERAND (gnu_expr, 0), NULL_TREE)); - - case ARRAY_REF: case ARRAY_RANGE_REF: - case REALPART_EXPR: case IMAGPART_EXPR: - case NOP_EXPR: - return addressable_p (TREE_OPERAND (gnu_expr, 0), NULL_TREE); - - case CONVERT_EXPR: - return (AGGREGATE_TYPE_P (TREE_TYPE (gnu_expr)) - && addressable_p (TREE_OPERAND (gnu_expr, 0), NULL_TREE)); - - case VIEW_CONVERT_EXPR: - { - /* This is addressable if we can avoid a copy. */ - tree type = TREE_TYPE (gnu_expr); - tree inner_type = TREE_TYPE (TREE_OPERAND (gnu_expr, 0)); - return (((TYPE_MODE (type) == TYPE_MODE (inner_type) - && (!STRICT_ALIGNMENT - || TYPE_ALIGN (type) <= TYPE_ALIGN (inner_type) - || TYPE_ALIGN (inner_type) >= BIGGEST_ALIGNMENT)) - || ((TYPE_MODE (type) == BLKmode - || TYPE_MODE (inner_type) == BLKmode) - && (!STRICT_ALIGNMENT - || TYPE_ALIGN (type) <= TYPE_ALIGN (inner_type) - || TYPE_ALIGN (inner_type) >= BIGGEST_ALIGNMENT - || TYPE_ALIGN_OK (type) - || TYPE_ALIGN_OK (inner_type)))) - && addressable_p (TREE_OPERAND (gnu_expr, 0), NULL_TREE)); - } - - default: - return false; - } -} - -/* Do the processing for the declaration of a GNAT_ENTITY, a type. If - a separate Freeze node exists, delay the bulk of the processing. Otherwise - make a GCC type for GNAT_ENTITY and set up the correspondence. */ - -void -process_type (Entity_Id gnat_entity) -{ - tree gnu_old - = present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity) : 0; - tree gnu_new; - - /* If we are to delay elaboration of this type, just do any - elaborations needed for expressions within the declaration and - make a dummy type entry for this node and its Full_View (if - any) in case something points to it. Don't do this if it - has already been done (the only way that can happen is if - the private completion is also delayed). */ - if (Present (Freeze_Node (gnat_entity)) - || (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind) - && Present (Full_View (gnat_entity)) - && Freeze_Node (Full_View (gnat_entity)) - && !present_gnu_tree (Full_View (gnat_entity)))) - { - elaborate_entity (gnat_entity); - - if (!gnu_old) - { - tree gnu_decl = create_type_decl (get_entity_name (gnat_entity), - make_dummy_type (gnat_entity), - NULL, false, false, gnat_entity); - - save_gnu_tree (gnat_entity, gnu_decl, false); - if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind) - && Present (Full_View (gnat_entity))) - save_gnu_tree (Full_View (gnat_entity), gnu_decl, false); - } - - return; - } - - /* If we saved away a dummy type for this node it means that this - made the type that corresponds to the full type of an incomplete - type. Clear that type for now and then update the type in the - pointers. */ - if (gnu_old) - { - gcc_assert (TREE_CODE (gnu_old) == TYPE_DECL - && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old))); - - save_gnu_tree (gnat_entity, NULL_TREE, false); - } - - /* Now fully elaborate the type. */ - gnu_new = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 1); - gcc_assert (TREE_CODE (gnu_new) == TYPE_DECL); - - /* If we have an old type and we've made pointers to this type, - update those pointers. */ - if (gnu_old) - update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)), - TREE_TYPE (gnu_new)); - - /* If this is a record type corresponding to a task or protected type - that is a completion of an incomplete type, perform a similar update - on the type. */ - /* ??? Including protected types here is a guess. */ - - if (IN (Ekind (gnat_entity), Record_Kind) - && Is_Concurrent_Record_Type (gnat_entity) - && present_gnu_tree (Corresponding_Concurrent_Type (gnat_entity))) - { - tree gnu_task_old - = get_gnu_tree (Corresponding_Concurrent_Type (gnat_entity)); - - save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity), - NULL_TREE, false); - save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity), - gnu_new, false); - - update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_task_old)), - TREE_TYPE (gnu_new)); - } -} - -/* GNAT_ENTITY is the type of the resulting constructors, - GNAT_ASSOC is the front of the Component_Associations of an N_Aggregate, - and GNU_TYPE is the GCC type of the corresponding record. - - Return a CONSTRUCTOR to build the record. */ - -static tree -assoc_to_constructor (Entity_Id gnat_entity, Node_Id gnat_assoc, tree gnu_type) -{ - tree gnu_list, gnu_result; - - /* We test for GNU_FIELD being empty in the case where a variant - was the last thing since we don't take things off GNAT_ASSOC in - that case. We check GNAT_ASSOC in case we have a variant, but it - has no fields. */ - - for (gnu_list = NULL_TREE; Present (gnat_assoc); - gnat_assoc = Next (gnat_assoc)) - { - Node_Id gnat_field = First (Choices (gnat_assoc)); - tree gnu_field = gnat_to_gnu_field_decl (Entity (gnat_field)); - tree gnu_expr = gnat_to_gnu (Expression (gnat_assoc)); - - /* The expander is supposed to put a single component selector name - in every record component association */ - gcc_assert (No (Next (gnat_field))); - - /* Ignore fields that have Corresponding_Discriminants since we'll - be setting that field in the parent. */ - if (Present (Corresponding_Discriminant (Entity (gnat_field))) - && Is_Tagged_Type (Scope (Entity (gnat_field)))) - continue; - - /* Also ignore discriminants of Unchecked_Unions. */ - else if (Is_Unchecked_Union (gnat_entity) - && Ekind (Entity (gnat_field)) == E_Discriminant) - continue; - - /* Before assigning a value in an aggregate make sure range checks - are done if required. Then convert to the type of the field. */ - if (Do_Range_Check (Expression (gnat_assoc))) - gnu_expr = emit_range_check (gnu_expr, Etype (gnat_field)); - - gnu_expr = convert (TREE_TYPE (gnu_field), gnu_expr); - - /* Add the field and expression to the list. */ - gnu_list = tree_cons (gnu_field, gnu_expr, gnu_list); - } - - gnu_result = extract_values (gnu_list, gnu_type); - -#ifdef ENABLE_CHECKING - { - tree gnu_field; - - /* Verify every entry in GNU_LIST was used. */ - for (gnu_field = gnu_list; gnu_field; gnu_field = TREE_CHAIN (gnu_field)) - gcc_assert (TREE_ADDRESSABLE (gnu_field)); - } -#endif - - return gnu_result; -} - -/* Builds a possibly nested constructor for array aggregates. GNAT_EXPR - is the first element of an array aggregate. It may itself be an - aggregate (an array or record aggregate). GNU_ARRAY_TYPE is the gnu type - corresponding to the array aggregate. GNAT_COMPONENT_TYPE is the type - of the array component. It is needed for range checking. */ - -static tree -pos_to_constructor (Node_Id gnat_expr, tree gnu_array_type, - Entity_Id gnat_component_type) -{ - tree gnu_expr_list = NULL_TREE; - tree gnu_index = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_array_type)); - tree gnu_expr; - - for ( ; Present (gnat_expr); gnat_expr = Next (gnat_expr)) - { - /* If the expression is itself an array aggregate then first build the - innermost constructor if it is part of our array (multi-dimensional - case). */ - - if (Nkind (gnat_expr) == N_Aggregate - && TREE_CODE (TREE_TYPE (gnu_array_type)) == ARRAY_TYPE - && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_array_type))) - gnu_expr = pos_to_constructor (First (Expressions (gnat_expr)), - TREE_TYPE (gnu_array_type), - gnat_component_type); - else - { - gnu_expr = gnat_to_gnu (gnat_expr); - - /* before assigning the element to the array make sure it is - in range */ - if (Do_Range_Check (gnat_expr)) - gnu_expr = emit_range_check (gnu_expr, gnat_component_type); - } - - gnu_expr_list - = tree_cons (gnu_index, convert (TREE_TYPE (gnu_array_type), gnu_expr), - gnu_expr_list); - - gnu_index = int_const_binop (PLUS_EXPR, gnu_index, integer_one_node, 0); - } - - return gnat_build_constructor (gnu_array_type, nreverse (gnu_expr_list)); -} - -/* Subroutine of assoc_to_constructor: VALUES is a list of field associations, - some of which are from RECORD_TYPE. Return a CONSTRUCTOR consisting - of the associations that are from RECORD_TYPE. If we see an internal - record, make a recursive call to fill it in as well. */ - -static tree -extract_values (tree values, tree record_type) -{ - tree result = NULL_TREE; - tree field, tem; - - for (field = TYPE_FIELDS (record_type); field; field = TREE_CHAIN (field)) - { - tree value = 0; - - /* _Parent is an internal field, but may have values in the aggregate, - so check for values first. */ - if ((tem = purpose_member (field, values))) - { - value = TREE_VALUE (tem); - TREE_ADDRESSABLE (tem) = 1; - } - - else if (DECL_INTERNAL_P (field)) - { - value = extract_values (values, TREE_TYPE (field)); - if (TREE_CODE (value) == CONSTRUCTOR - && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (value))) - value = 0; - } - else - /* If we have a record subtype, the names will match, but not the - actual FIELD_DECLs. */ - for (tem = values; tem; tem = TREE_CHAIN (tem)) - if (DECL_NAME (TREE_PURPOSE (tem)) == DECL_NAME (field)) - { - value = convert (TREE_TYPE (field), TREE_VALUE (tem)); - TREE_ADDRESSABLE (tem) = 1; - } - - if (!value) - continue; - - result = tree_cons (field, value, result); - } - - return gnat_build_constructor (record_type, nreverse (result)); -} - -/* EXP is to be treated as an array or record. Handle the cases when it is - an access object and perform the required dereferences. */ - -static tree -maybe_implicit_deref (tree exp) -{ - /* If the type is a pointer, dereference it. */ - - if (POINTER_TYPE_P (TREE_TYPE (exp)) || TYPE_FAT_POINTER_P (TREE_TYPE (exp))) - exp = build_unary_op (INDIRECT_REF, NULL_TREE, exp); - - /* If we got a padded type, remove it too. */ - if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE - && TYPE_IS_PADDING_P (TREE_TYPE (exp))) - exp = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (exp))), exp); - - return exp; -} - -/* Protect EXP from multiple evaluation. This may make a SAVE_EXPR. */ - -tree -protect_multiple_eval (tree exp) -{ - tree type = TREE_TYPE (exp); - - /* If this has no side effects, we don't need to do anything. */ - if (!TREE_SIDE_EFFECTS (exp)) - return exp; - - /* If it is a conversion, protect what's inside the conversion. - Similarly, if we're indirectly referencing something, we only - actually need to protect the address since the data itself can't - change in these situations. */ - else if (TREE_CODE (exp) == NON_LVALUE_EXPR - || CONVERT_EXPR_P (exp) - || TREE_CODE (exp) == VIEW_CONVERT_EXPR - || TREE_CODE (exp) == INDIRECT_REF - || TREE_CODE (exp) == UNCONSTRAINED_ARRAY_REF) - return build1 (TREE_CODE (exp), type, - protect_multiple_eval (TREE_OPERAND (exp, 0))); - - /* If EXP is a fat pointer or something that can be placed into a register, - just make a SAVE_EXPR. */ - if (TYPE_FAT_POINTER_P (type) || TYPE_MODE (type) != BLKmode) - return save_expr (exp); - - /* Otherwise, dereference, protect the address, and re-reference. */ - else - return - build_unary_op (INDIRECT_REF, type, - save_expr (build_unary_op (ADDR_EXPR, - build_reference_type (type), - exp))); -} - -/* This is equivalent to stabilize_reference in tree.c, but we know how to - handle our own nodes and we take extra arguments. FORCE says whether to - force evaluation of everything. We set SUCCESS to true unless we walk - through something we don't know how to stabilize. */ - -tree -maybe_stabilize_reference (tree ref, bool force, bool *success) -{ - tree type = TREE_TYPE (ref); - enum tree_code code = TREE_CODE (ref); - tree result; - - /* Assume we'll success unless proven otherwise. */ - *success = true; - - switch (code) - { - case CONST_DECL: - case VAR_DECL: - case PARM_DECL: - case RESULT_DECL: - /* No action is needed in this case. */ - return ref; - - case ADDR_EXPR: - CASE_CONVERT: - case FLOAT_EXPR: - case FIX_TRUNC_EXPR: - case VIEW_CONVERT_EXPR: - result - = build1 (code, type, - maybe_stabilize_reference (TREE_OPERAND (ref, 0), force, - success)); - break; - - case INDIRECT_REF: - case UNCONSTRAINED_ARRAY_REF: - result = build1 (code, type, - gnat_stabilize_reference_1 (TREE_OPERAND (ref, 0), - force)); - break; - - case COMPONENT_REF: - result = build3 (COMPONENT_REF, type, - maybe_stabilize_reference (TREE_OPERAND (ref, 0), force, - success), - TREE_OPERAND (ref, 1), NULL_TREE); - break; - - case BIT_FIELD_REF: - result = build3 (BIT_FIELD_REF, type, - maybe_stabilize_reference (TREE_OPERAND (ref, 0), force, - success), - gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1), - force), - gnat_stabilize_reference_1 (TREE_OPERAND (ref, 2), - force)); - break; - - case ARRAY_REF: - case ARRAY_RANGE_REF: - result = build4 (code, type, - maybe_stabilize_reference (TREE_OPERAND (ref, 0), force, - success), - gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1), - force), - NULL_TREE, NULL_TREE); - break; - - case COMPOUND_EXPR: - result = gnat_stabilize_reference_1 (ref, force); - break; - - case CALL_EXPR: - /* This generates better code than the scheme in protect_multiple_eval - because large objects will be returned via invisible reference in - most ABIs so the temporary will directly be filled by the callee. */ - result = gnat_stabilize_reference_1 (ref, force); - break; - - case CONSTRUCTOR: - /* Constructors with 1 element are used extensively to formally - convert objects to special wrapping types. */ - if (TREE_CODE (type) == RECORD_TYPE - && VEC_length (constructor_elt, CONSTRUCTOR_ELTS (ref)) == 1) - { - tree index - = VEC_index (constructor_elt, CONSTRUCTOR_ELTS (ref), 0)->index; - tree value - = VEC_index (constructor_elt, CONSTRUCTOR_ELTS (ref), 0)->value; - result - = build_constructor_single (type, index, - gnat_stabilize_reference_1 (value, - force)); - } - else - { - *success = false; - return ref; - } - break; - - case ERROR_MARK: - ref = error_mark_node; - - /* ... Fallthru to failure ... */ - - /* If arg isn't a kind of lvalue we recognize, make no change. - Caller should recognize the error for an invalid lvalue. */ - default: - *success = false; - return ref; - } - - TREE_READONLY (result) = TREE_READONLY (ref); - - /* TREE_THIS_VOLATILE and TREE_SIDE_EFFECTS attached to the initial - expression may not be sustained across some paths, such as the way via - build1 for INDIRECT_REF. We re-populate those flags here for the general - case, which is consistent with the GCC version of this routine. - - Special care should be taken regarding TREE_SIDE_EFFECTS, because some - paths introduce side effects where there was none initially (e.g. calls - to save_expr), and we also want to keep track of that. */ - - TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref); - TREE_SIDE_EFFECTS (result) |= TREE_SIDE_EFFECTS (ref); - - return result; -} - -/* Wrapper around maybe_stabilize_reference, for common uses without - lvalue restrictions and without need to examine the success - indication. */ - -static tree -gnat_stabilize_reference (tree ref, bool force) -{ - bool dummy; - return maybe_stabilize_reference (ref, force, &dummy); -} - -/* Similar to stabilize_reference_1 in tree.c, but supports an extra - arg to force a SAVE_EXPR for everything. */ - -static tree -gnat_stabilize_reference_1 (tree e, bool force) -{ - enum tree_code code = TREE_CODE (e); - tree type = TREE_TYPE (e); - tree result; - - /* We cannot ignore const expressions because it might be a reference - to a const array but whose index contains side-effects. But we can - ignore things that are actual constant or that already have been - handled by this function. */ - - if (TREE_CONSTANT (e) || code == SAVE_EXPR) - return e; - - switch (TREE_CODE_CLASS (code)) - { - case tcc_exceptional: - case tcc_type: - case tcc_declaration: - case tcc_comparison: - case tcc_statement: - case tcc_expression: - case tcc_reference: - case tcc_vl_exp: - /* If this is a COMPONENT_REF of a fat pointer, save the entire - fat pointer. This may be more efficient, but will also allow - us to more easily find the match for the PLACEHOLDER_EXPR. */ - if (code == COMPONENT_REF - && TYPE_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (e, 0)))) - result = build3 (COMPONENT_REF, type, - gnat_stabilize_reference_1 (TREE_OPERAND (e, 0), - force), - TREE_OPERAND (e, 1), TREE_OPERAND (e, 2)); - else if (TREE_SIDE_EFFECTS (e) || force) - return save_expr (e); - else - return e; - break; - - case tcc_constant: - /* Constants need no processing. In fact, we should never reach - here. */ - return e; - - case tcc_binary: - /* Recursively stabilize each operand. */ - result = build2 (code, type, - gnat_stabilize_reference_1 (TREE_OPERAND (e, 0), force), - gnat_stabilize_reference_1 (TREE_OPERAND (e, 1), - force)); - break; - - case tcc_unary: - /* Recursively stabilize each operand. */ - result = build1 (code, type, - gnat_stabilize_reference_1 (TREE_OPERAND (e, 0), - force)); - break; - - default: - gcc_unreachable (); - } - - TREE_READONLY (result) = TREE_READONLY (e); - - TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e); - TREE_SIDE_EFFECTS (result) |= TREE_SIDE_EFFECTS (e); - return result; -} - -/* Convert SLOC into LOCUS. Return true if SLOC corresponds to a source code - location and false if it doesn't. In the former case, set the Gigi global - variable REF_FILENAME to the simple debug file name as given by sinput. */ - -bool -Sloc_to_locus (Source_Ptr Sloc, location_t *locus) -{ - if (Sloc == No_Location) - return false; - - if (Sloc <= Standard_Location) - { - if (*locus == UNKNOWN_LOCATION) - *locus = BUILTINS_LOCATION; - return false; - } - else - { - Source_File_Index file = Get_Source_File_Index (Sloc); - Logical_Line_Number line = Get_Logical_Line_Number (Sloc); - Column_Number column = Get_Column_Number (Sloc); - struct line_map *map = &line_table->maps[file - 1]; - - /* Translate the location according to the line-map.h formula. */ - *locus = map->start_location - + ((line - map->to_line) << map->column_bits) - + (column & ((1 << map->column_bits) - 1)); - } - - ref_filename - = IDENTIFIER_POINTER - (get_identifier - (Get_Name_String (Debug_Source_Name (Get_Source_File_Index (Sloc)))));; - - return true; -} - -/* Similar to set_expr_location, but start with the Sloc of GNAT_NODE and - don't do anything if it doesn't correspond to a source location. */ - -static void -set_expr_location_from_node (tree node, Node_Id gnat_node) -{ - location_t locus; - - if (!Sloc_to_locus (Sloc (gnat_node), &locus)) - return; - - SET_EXPR_LOCATION (node, locus); -} - -/* Return a colon-separated list of encodings contained in encoded Ada - name. */ - -static const char * -extract_encoding (const char *name) -{ - char *encoding = GGC_NEWVEC (char, strlen (name)); - - get_encoding (name, encoding); - - return encoding; -} - -/* Extract the Ada name from an encoded name. */ - -static const char * -decode_name (const char *name) -{ - char *decoded = GGC_NEWVEC (char, strlen (name) * 2 + 60); - - __gnat_decode (name, decoded, 0); - - return decoded; -} - -/* Post an error message. MSG is the error message, properly annotated. - NODE is the node at which to post the error and the node to use for the - "&" substitution. */ - -void -post_error (const char *msg, Node_Id node) -{ - String_Template temp; - Fat_Pointer fp; - - temp.Low_Bound = 1, temp.High_Bound = strlen (msg); - fp.Array = msg, fp.Bounds = &temp; - if (Present (node)) - Error_Msg_N (fp, node); -} - -/* Similar, but NODE is the node at which to post the error and ENT - is the node to use for the "&" substitution. */ - -void -post_error_ne (const char *msg, Node_Id node, Entity_Id ent) -{ - String_Template temp; - Fat_Pointer fp; - - temp.Low_Bound = 1, temp.High_Bound = strlen (msg); - fp.Array = msg, fp.Bounds = &temp; - if (Present (node)) - Error_Msg_NE (fp, node, ent); -} - -/* Similar, but NODE is the node at which to post the error, ENT is the node - to use for the "&" substitution, and N is the number to use for the ^. */ - -void -post_error_ne_num (const char *msg, Node_Id node, Entity_Id ent, int n) -{ - String_Template temp; - Fat_Pointer fp; - - temp.Low_Bound = 1, temp.High_Bound = strlen (msg); - fp.Array = msg, fp.Bounds = &temp; - Error_Msg_Uint_1 = UI_From_Int (n); - - if (Present (node)) - Error_Msg_NE (fp, node, ent); -} - -/* Similar to post_error_ne_num, but T is a GCC tree representing the - number to write. If the tree represents a constant that fits within - a host integer, the text inside curly brackets in MSG will be output - (presumably including a '^'). Otherwise that text will not be output - and the text inside square brackets will be output instead. */ - -void -post_error_ne_tree (const char *msg, Node_Id node, Entity_Id ent, tree t) -{ - char *newmsg = XALLOCAVEC (char, strlen (msg) + 1); - String_Template temp = {1, 0}; - Fat_Pointer fp; - char start_yes, end_yes, start_no, end_no; - const char *p; - char *q; - - fp.Array = newmsg, fp.Bounds = &temp; - - if (host_integerp (t, 1) -#if HOST_BITS_PER_WIDE_INT > HOST_BITS_PER_INT - && - compare_tree_int - (t, (((unsigned HOST_WIDE_INT) 1 << (HOST_BITS_PER_INT - 1)) - 1)) < 0 -#endif - ) - { - Error_Msg_Uint_1 = UI_From_Int (tree_low_cst (t, 1)); - start_yes = '{', end_yes = '}', start_no = '[', end_no = ']'; - } - else - start_yes = '[', end_yes = ']', start_no = '{', end_no = '}'; - - for (p = msg, q = newmsg; *p; p++) - { - if (*p == start_yes) - for (p++; *p != end_yes; p++) - *q++ = *p; - else if (*p == start_no) - for (p++; *p != end_no; p++) - ; - else - *q++ = *p; - } - - *q = 0; - - temp.High_Bound = strlen (newmsg); - if (Present (node)) - Error_Msg_NE (fp, node, ent); -} - -/* Similar to post_error_ne_tree, except that NUM is a second - integer to write in the message. */ - -void -post_error_ne_tree_2 (const char *msg, - Node_Id node, - Entity_Id ent, - tree t, - int num) -{ - Error_Msg_Uint_2 = UI_From_Int (num); - post_error_ne_tree (msg, node, ent, t); -} - -/* Initialize the table that maps GNAT codes to GCC codes for simple - binary and unary operations. */ - -static void -init_code_table (void) -{ - gnu_codes[N_And_Then] = TRUTH_ANDIF_EXPR; - gnu_codes[N_Or_Else] = TRUTH_ORIF_EXPR; - - gnu_codes[N_Op_And] = TRUTH_AND_EXPR; - gnu_codes[N_Op_Or] = TRUTH_OR_EXPR; - gnu_codes[N_Op_Xor] = TRUTH_XOR_EXPR; - gnu_codes[N_Op_Eq] = EQ_EXPR; - gnu_codes[N_Op_Ne] = NE_EXPR; - gnu_codes[N_Op_Lt] = LT_EXPR; - gnu_codes[N_Op_Le] = LE_EXPR; - gnu_codes[N_Op_Gt] = GT_EXPR; - gnu_codes[N_Op_Ge] = GE_EXPR; - gnu_codes[N_Op_Add] = PLUS_EXPR; - gnu_codes[N_Op_Subtract] = MINUS_EXPR; - gnu_codes[N_Op_Multiply] = MULT_EXPR; - gnu_codes[N_Op_Mod] = FLOOR_MOD_EXPR; - gnu_codes[N_Op_Rem] = TRUNC_MOD_EXPR; - gnu_codes[N_Op_Minus] = NEGATE_EXPR; - gnu_codes[N_Op_Abs] = ABS_EXPR; - gnu_codes[N_Op_Not] = TRUTH_NOT_EXPR; - gnu_codes[N_Op_Rotate_Left] = LROTATE_EXPR; - gnu_codes[N_Op_Rotate_Right] = RROTATE_EXPR; - gnu_codes[N_Op_Shift_Left] = LSHIFT_EXPR; - gnu_codes[N_Op_Shift_Right] = RSHIFT_EXPR; - gnu_codes[N_Op_Shift_Right_Arithmetic] = RSHIFT_EXPR; -} - -/* Return a label to branch to for the exception type in KIND or NULL_TREE - if none. */ - -tree -get_exception_label (char kind) -{ - if (kind == N_Raise_Constraint_Error) - return TREE_VALUE (gnu_constraint_error_label_stack); - else if (kind == N_Raise_Storage_Error) - return TREE_VALUE (gnu_storage_error_label_stack); - else if (kind == N_Raise_Program_Error) - return TREE_VALUE (gnu_program_error_label_stack); - else - return NULL_TREE; -} - -#include "gt-ada-trans.h" |