1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2005, Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 2, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
17 * for more details. You should have received a copy of the GNU General *
18 * Public License distributed with GNAT; see file COPYING. If not, write *
19 * to the Free Software Foundation, 51 Franklin Street, Fifth Floor, *
20 * Boston, MA 02110-1301, USA. *
22 * GNAT was originally developed by the GNAT team at New York University. *
23 * Extensive contributions were provided by Ada Core Technologies Inc. *
25 ****************************************************************************/
29 #include "coretypes.h"
43 #include "tree-gimple.h"
62 struct Node *Nodes_Ptr;
63 Node_Id *Next_Node_Ptr;
64 Node_Id *Prev_Node_Ptr;
65 struct Elist_Header *Elists_Ptr;
66 struct Elmt_Item *Elmts_Ptr;
67 struct String_Entry *Strings_Ptr;
68 Char_Code *String_Chars_Ptr;
69 struct List_Header *List_Headers_Ptr;
71 /* Current filename without path. */
72 const char *ref_filename;
74 /* If true, then gigi is being called on an analyzed but unexpanded
75 tree, and the only purpose of the call is to properly annotate
76 types with representation information. */
77 bool type_annotate_only;
79 /* A structure used to gather together information about a statement group.
80 We use this to gather related statements, for example the "then" part
81 of a IF. In the case where it represents a lexical scope, we may also
82 have a BLOCK node corresponding to it and/or cleanups. */
84 struct stmt_group GTY((chain_next ("%h.previous"))) {
85 struct stmt_group *previous; /* Previous code group. */
86 tree stmt_list; /* List of statements for this code group. */
87 tree block; /* BLOCK for this code group, if any. */
88 tree cleanups; /* Cleanups for this code group, if any. */
91 static GTY(()) struct stmt_group *current_stmt_group;
93 /* List of unused struct stmt_group nodes. */
94 static GTY((deletable)) struct stmt_group *stmt_group_free_list;
96 /* A structure used to record information on elaboration procedures
97 we've made and need to process.
99 ??? gnat_node should be Node_Id, but gengtype gets confused. */
101 struct elab_info GTY((chain_next ("%h.next"))) {
102 struct elab_info *next; /* Pointer to next in chain. */
103 tree elab_proc; /* Elaboration procedure. */
104 int gnat_node; /* The N_Compilation_Unit. */
107 static GTY(()) struct elab_info *elab_info_list;
109 /* Free list of TREE_LIST nodes used for stacks. */
110 static GTY((deletable)) tree gnu_stack_free_list;
112 /* List of TREE_LIST nodes representing a stack of exception pointer
113 variables. TREE_VALUE is the VAR_DECL that stores the address of
114 the raised exception. Nonzero means we are in an exception
115 handler. Not used in the zero-cost case. */
116 static GTY(()) tree gnu_except_ptr_stack;
118 /* List of TREE_LIST nodes used to store the current elaboration procedure
119 decl. TREE_VALUE is the decl. */
120 static GTY(()) tree gnu_elab_proc_stack;
122 /* Variable that stores a list of labels to be used as a goto target instead of
123 a return in some functions. See processing for N_Subprogram_Body. */
124 static GTY(()) tree gnu_return_label_stack;
126 /* List of TREE_LIST nodes representing a stack of LOOP_STMT nodes.
127 TREE_VALUE of each entry is the label of the corresponding LOOP_STMT. */
128 static GTY(()) tree gnu_loop_label_stack;
130 /* List of TREE_LIST nodes representing labels for switch statements.
131 TREE_VALUE of each entry is the label at the end of the switch. */
132 static GTY(()) tree gnu_switch_label_stack;
134 /* Map GNAT tree codes to GCC tree codes for simple expressions. */
135 static enum tree_code gnu_codes[Number_Node_Kinds];
137 /* Current node being treated, in case abort called. */
138 Node_Id error_gnat_node;
140 static void Compilation_Unit_to_gnu (Node_Id);
141 static void record_code_position (Node_Id);
142 static void insert_code_for (Node_Id);
143 static void start_stmt_group (void);
144 static void add_cleanup (tree);
145 static tree mark_visited (tree *, int *, void *);
146 static tree mark_unvisited (tree *, int *, void *);
147 static tree end_stmt_group (void);
148 static void add_stmt_list (List_Id);
149 static tree build_stmt_group (List_Id, bool);
150 static void push_stack (tree *, tree, tree);
151 static void pop_stack (tree *);
152 static enum gimplify_status gnat_gimplify_stmt (tree *);
153 static void elaborate_all_entities (Node_Id);
154 static void process_freeze_entity (Node_Id);
155 static void process_inlined_subprograms (Node_Id);
156 static void process_decls (List_Id, List_Id, Node_Id, bool, bool);
157 static tree emit_range_check (tree, Node_Id);
158 static tree emit_index_check (tree, tree, tree, tree);
159 static tree emit_check (tree, tree, int);
160 static tree convert_with_check (Entity_Id, tree, bool, bool, bool);
161 static bool addressable_p (tree);
162 static tree assoc_to_constructor (Node_Id, tree);
163 static tree extract_values (tree, tree);
164 static tree pos_to_constructor (Node_Id, tree, Entity_Id);
165 static tree maybe_implicit_deref (tree);
166 static tree gnat_stabilize_reference_1 (tree, bool);
167 static void annotate_with_node (tree, Node_Id);
168 static void build_global_cdtor (int, tree *);
171 /* This is the main program of the back-end. It sets up all the table
172 structures and then generates code. */
175 gigi (Node_Id gnat_root, int max_gnat_node, int number_name,
176 struct Node *nodes_ptr, Node_Id *next_node_ptr, Node_Id *prev_node_ptr,
177 struct Elist_Header *elists_ptr, struct Elmt_Item *elmts_ptr,
178 struct String_Entry *strings_ptr, Char_Code *string_chars_ptr,
179 struct List_Header *list_headers_ptr, Int number_units ATTRIBUTE_UNUSED,
180 char *file_info_ptr ATTRIBUTE_UNUSED, Entity_Id standard_integer,
181 Entity_Id standard_long_long_float, Entity_Id standard_exception_type,
182 Int gigi_operating_mode)
184 tree gnu_standard_long_long_float;
185 tree gnu_standard_exception_type;
186 struct elab_info *info;
188 max_gnat_nodes = max_gnat_node;
189 number_names = number_name;
190 Nodes_Ptr = nodes_ptr;
191 Next_Node_Ptr = next_node_ptr;
192 Prev_Node_Ptr = prev_node_ptr;
193 Elists_Ptr = elists_ptr;
194 Elmts_Ptr = elmts_ptr;
195 Strings_Ptr = strings_ptr;
196 String_Chars_Ptr = string_chars_ptr;
197 List_Headers_Ptr = list_headers_ptr;
199 type_annotate_only = (gigi_operating_mode == 1);
202 gnat_compute_largest_alignment ();
205 /* If we are just annotating types, give VOID_TYPE zero sizes to avoid
207 if (type_annotate_only)
209 TYPE_SIZE (void_type_node) = bitsize_zero_node;
210 TYPE_SIZE_UNIT (void_type_node) = size_zero_node;
213 /* Save the type we made for integer as the type for Standard.Integer.
214 Then make the rest of the standard types. Note that some of these
216 save_gnu_tree (Base_Type (standard_integer), TYPE_NAME (integer_type_node),
219 gnu_except_ptr_stack = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE);
221 gnu_standard_long_long_float
222 = gnat_to_gnu_entity (Base_Type (standard_long_long_float), NULL_TREE, 0);
223 gnu_standard_exception_type
224 = gnat_to_gnu_entity (Base_Type (standard_exception_type), NULL_TREE, 0);
226 init_gigi_decls (gnu_standard_long_long_float, gnu_standard_exception_type);
228 /* Process any Pragma Ident for the main unit. */
229 #ifdef ASM_OUTPUT_IDENT
230 if (Present (Ident_String (Main_Unit)))
233 TREE_STRING_POINTER (gnat_to_gnu (Ident_String (Main_Unit))));
236 /* If we are using the GCC exception mechanism, let GCC know. */
237 if (Exception_Mechanism == Back_End_Exceptions)
240 gcc_assert (Nkind (gnat_root) == N_Compilation_Unit);
241 Compilation_Unit_to_gnu (gnat_root);
243 /* Now see if we have any elaboration procedures to deal with. */
244 for (info = elab_info_list; info; info = info->next)
246 tree gnu_body = DECL_SAVED_TREE (info->elab_proc);
249 /* Mark everything we have as not visited. */
250 walk_tree_without_duplicates (&gnu_body, mark_unvisited, NULL);
252 /* Set the current function to be the elaboration procedure and gimplify
254 current_function_decl = info->elab_proc;
255 gimplify_body (&gnu_body, info->elab_proc, true);
257 /* We should have a BIND_EXPR, but it may or may not have any statements
258 in it. If it doesn't have any, we have nothing to do. */
259 gnu_stmts = gnu_body;
260 if (TREE_CODE (gnu_stmts) == BIND_EXPR)
261 gnu_stmts = BIND_EXPR_BODY (gnu_stmts);
263 /* If there are no statements, there is no elaboration code. */
264 if (!gnu_stmts || !STATEMENT_LIST_HEAD (gnu_stmts))
265 Set_Has_No_Elaboration_Code (info->gnat_node, 1);
268 /* Otherwise, compile the function. Note that we'll be gimplifying
269 it twice, but that's fine for the nodes we use. */
270 begin_subprog_body (info->elab_proc);
271 end_subprog_body (gnu_body);
276 /* Perform initializations for this module. */
279 gnat_init_stmt_group ()
281 /* Initialize ourselves. */
285 /* Enable GNAT stack checking method if needed */
286 if (!Stack_Check_Probes_On_Target)
287 set_stack_check_libfunc (gen_rtx_SYMBOL_REF (Pmode, "_gnat_stack_check"));
290 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Identifier,
291 to a GCC tree, which is returned. GNU_RESULT_TYPE_P is a pointer to
292 where we should place the result type. */
295 Identifier_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p)
297 tree gnu_result_type;
299 Node_Id gnat_temp, gnat_temp_type;
301 /* If the Etype of this node does not equal the Etype of the Entity,
302 something is wrong with the entity map, probably in generic
303 instantiation. However, this does not apply to types. Since we sometime
304 have strange Ekind's, just do this test for objects. Also, if the Etype of
305 the Entity is private, the Etype of the N_Identifier is allowed to be the
306 full type and also we consider a packed array type to be the same as the
307 original type. Similarly, a class-wide type is equivalent to a subtype of
308 itself. Finally, if the types are Itypes, one may be a copy of the other,
309 which is also legal. */
310 gnat_temp = (Nkind (gnat_node) == N_Defining_Identifier
311 ? gnat_node : Entity (gnat_node));
312 gnat_temp_type = Etype (gnat_temp);
314 gcc_assert (Etype (gnat_node) == gnat_temp_type
315 || (Is_Packed (gnat_temp_type)
316 && Etype (gnat_node) == Packed_Array_Type (gnat_temp_type))
317 || (Is_Class_Wide_Type (Etype (gnat_node)))
318 || (IN (Ekind (gnat_temp_type), Private_Kind)
319 && Present (Full_View (gnat_temp_type))
320 && ((Etype (gnat_node) == Full_View (gnat_temp_type))
321 || (Is_Packed (Full_View (gnat_temp_type))
322 && (Etype (gnat_node)
323 == Packed_Array_Type (Full_View
324 (gnat_temp_type))))))
325 || (Is_Itype (Etype (gnat_node)) && Is_Itype (gnat_temp_type))
326 || !(Ekind (gnat_temp) == E_Variable
327 || Ekind (gnat_temp) == E_Component
328 || Ekind (gnat_temp) == E_Constant
329 || Ekind (gnat_temp) == E_Loop_Parameter
330 || IN (Ekind (gnat_temp), Formal_Kind)));
332 /* If this is a reference to a deferred constant whose partial view is an
333 unconstrained private type, the proper type is on the full view of the
334 constant, not on the full view of the type, which may be unconstrained.
336 This may be a reference to a type, for example in the prefix of the
337 attribute Position, generated for dispatching code (see Make_DT in
338 exp_disp,adb). In that case we need the type itself, not is parent,
339 in particular if it is a derived type */
340 if (Is_Private_Type (gnat_temp_type)
341 && Has_Unknown_Discriminants (gnat_temp_type)
342 && Present (Full_View (gnat_temp))
343 && !Is_Type (gnat_temp))
345 gnat_temp = Full_View (gnat_temp);
346 gnat_temp_type = Etype (gnat_temp);
347 gnu_result_type = get_unpadded_type (gnat_temp_type);
351 /* Expand the type of this identifier first, in case it is an enumeral
352 literal, which only get made when the type is expanded. There is no
353 order-of-elaboration issue here. We want to use the Actual_Subtype if
354 it has already been elaborated, otherwise the Etype. Avoid using
355 Actual_Subtype for packed arrays to simplify things. */
356 if ((Ekind (gnat_temp) == E_Constant
357 || Ekind (gnat_temp) == E_Variable || Is_Formal (gnat_temp))
358 && !(Is_Array_Type (Etype (gnat_temp))
359 && Present (Packed_Array_Type (Etype (gnat_temp))))
360 && Present (Actual_Subtype (gnat_temp))
361 && present_gnu_tree (Actual_Subtype (gnat_temp)))
362 gnat_temp_type = Actual_Subtype (gnat_temp);
364 gnat_temp_type = Etype (gnat_node);
366 gnu_result_type = get_unpadded_type (gnat_temp_type);
369 gnu_result = gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0);
371 /* If we are in an exception handler, force this variable into memory to
372 ensure optimization does not remove stores that appear redundant but are
373 actually needed in case an exception occurs.
375 ??? Note that we need not do this if the variable is declared within the
376 handler, only if it is referenced in the handler and declared in an
377 enclosing block, but we have no way of testing that right now.
379 ??? Also, for now all we can do is make it volatile. But we only
381 if (TREE_VALUE (gnu_except_ptr_stack)
382 && TREE_CODE (gnu_result) == VAR_DECL)
383 TREE_THIS_VOLATILE (gnu_result) = TREE_SIDE_EFFECTS (gnu_result) = 1;
385 /* Some objects (such as parameters passed by reference, globals of
386 variable size, and renamed objects) actually represent the address
387 of the object. In that case, we must do the dereference. Likewise,
388 deal with parameters to foreign convention subprograms. Call fold
389 here since GNU_RESULT may be a CONST_DECL. */
390 if (DECL_P (gnu_result)
391 && (DECL_BY_REF_P (gnu_result)
392 || (TREE_CODE (gnu_result) == PARM_DECL
393 && DECL_BY_COMPONENT_PTR_P (gnu_result))))
395 bool ro = DECL_POINTS_TO_READONLY_P (gnu_result);
398 if (TREE_CODE (gnu_result) == PARM_DECL
399 && DECL_BY_COMPONENT_PTR_P (gnu_result))
401 = build_unary_op (INDIRECT_REF, NULL_TREE,
402 convert (build_pointer_type (gnu_result_type),
405 /* If it's a renaming pointer and we are at the right binding level,
406 we can reference the renamed object directly, since the renamed
407 expression has been protected against multiple evaluations. */
408 else if (TREE_CODE (gnu_result) == VAR_DECL
409 && (renamed_obj = DECL_RENAMED_OBJECT (gnu_result)) != 0
410 && (! DECL_RENAMING_GLOBAL_P (gnu_result)
411 || global_bindings_p ())
412 /* Make sure it's an lvalue like INDIRECT_REF. */
413 && (DECL_P (renamed_obj)
414 || REFERENCE_CLASS_P (renamed_obj)
415 || (TREE_CODE (renamed_obj) == VIEW_CONVERT_EXPR
416 && (DECL_P (TREE_OPERAND (renamed_obj, 0))
417 || REFERENCE_CLASS_P (TREE_OPERAND (renamed_obj,0))))))
418 gnu_result = renamed_obj;
420 gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE,
423 TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result) = ro;
426 /* The GNAT tree has the type of a function as the type of its result. Also
427 use the type of the result if the Etype is a subtype which is nominally
428 unconstrained. But remove any padding from the resulting type. */
429 if (TREE_CODE (TREE_TYPE (gnu_result)) == FUNCTION_TYPE
430 || Is_Constr_Subt_For_UN_Aliased (gnat_temp_type))
432 gnu_result_type = TREE_TYPE (gnu_result);
433 if (TREE_CODE (gnu_result_type) == RECORD_TYPE
434 && TYPE_IS_PADDING_P (gnu_result_type))
435 gnu_result_type = TREE_TYPE (TYPE_FIELDS (gnu_result_type));
438 /* We always want to return the underlying INTEGER_CST for an enumeration
439 literal to avoid the need to call fold in lots of places. But don't do
440 this is the parent will be taking the address of this object. */
441 if (TREE_CODE (gnu_result) == CONST_DECL)
443 gnat_temp = Parent (gnat_node);
444 if (!DECL_CONST_CORRESPONDING_VAR (gnu_result)
445 || (Nkind (gnat_temp) != N_Reference
446 && !(Nkind (gnat_temp) == N_Attribute_Reference
447 && ((Get_Attribute_Id (Attribute_Name (gnat_temp))
449 || (Get_Attribute_Id (Attribute_Name (gnat_temp))
451 || (Get_Attribute_Id (Attribute_Name (gnat_temp))
452 == Attr_Unchecked_Access)
453 || (Get_Attribute_Id (Attribute_Name (gnat_temp))
454 == Attr_Unrestricted_Access)))))
455 gnu_result = DECL_INITIAL (gnu_result);
458 *gnu_result_type_p = gnu_result_type;
462 /* Subroutine of gnat_to_gnu to process gnat_node, an N_Pragma. Return
463 any statements we generate. */
466 Pragma_to_gnu (Node_Id gnat_node)
469 tree gnu_result = alloc_stmt_list ();
471 /* Check for (and ignore) unrecognized pragma and do nothing if we are just
473 if (type_annotate_only || !Is_Pragma_Name (Chars (gnat_node)))
476 switch (Get_Pragma_Id (Chars (gnat_node)))
478 case Pragma_Inspection_Point:
479 /* Do nothing at top level: all such variables are already viewable. */
480 if (global_bindings_p ())
483 for (gnat_temp = First (Pragma_Argument_Associations (gnat_node));
485 gnat_temp = Next (gnat_temp))
487 tree gnu_expr = gnat_to_gnu (Expression (gnat_temp));
489 if (TREE_CODE (gnu_expr) == UNCONSTRAINED_ARRAY_REF)
490 gnu_expr = TREE_OPERAND (gnu_expr, 0);
492 gnu_expr = build1 (USE_STMT, void_type_node, gnu_expr);
493 annotate_with_node (gnu_expr, gnat_node);
494 append_to_statement_list (gnu_expr, &gnu_result);
498 case Pragma_Optimize:
499 switch (Chars (Expression
500 (First (Pragma_Argument_Associations (gnat_node)))))
502 case Name_Time: case Name_Space:
504 post_error ("insufficient -O value?", gnat_node);
509 post_error ("must specify -O0?", gnat_node);
517 case Pragma_Reviewable:
518 if (write_symbols == NO_DEBUG)
519 post_error ("must specify -g?", gnat_node);
525 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Attribute,
526 to a GCC tree, which is returned. GNU_RESULT_TYPE_P is a pointer to
527 where we should place the result type. ATTRIBUTE is the attribute ID. */
530 Attribute_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, int attribute)
532 tree gnu_result = error_mark_node;
533 tree gnu_result_type;
535 bool prefix_unused = false;
536 tree gnu_prefix = gnat_to_gnu (Prefix (gnat_node));
537 tree gnu_type = TREE_TYPE (gnu_prefix);
539 /* If the input is a NULL_EXPR, make a new one. */
540 if (TREE_CODE (gnu_prefix) == NULL_EXPR)
542 *gnu_result_type_p = get_unpadded_type (Etype (gnat_node));
543 return build1 (NULL_EXPR, *gnu_result_type_p,
544 TREE_OPERAND (gnu_prefix, 0));
551 /* These are just conversions until since representation clauses for
552 enumerations are handled in the front end. */
554 bool checkp = Do_Range_Check (First (Expressions (gnat_node)));
556 gnu_result = gnat_to_gnu (First (Expressions (gnat_node)));
557 gnu_result_type = get_unpadded_type (Etype (gnat_node));
558 gnu_result = convert_with_check (Etype (gnat_node), gnu_result,
559 checkp, checkp, true);
565 /* These just add or subject the constant 1. Representation clauses for
566 enumerations are handled in the front-end. */
567 gnu_expr = gnat_to_gnu (First (Expressions (gnat_node)));
568 gnu_result_type = get_unpadded_type (Etype (gnat_node));
570 if (Do_Range_Check (First (Expressions (gnat_node))))
572 gnu_expr = protect_multiple_eval (gnu_expr);
575 (build_binary_op (EQ_EXPR, integer_type_node,
577 attribute == Attr_Pred
578 ? TYPE_MIN_VALUE (gnu_result_type)
579 : TYPE_MAX_VALUE (gnu_result_type)),
580 gnu_expr, CE_Range_Check_Failed);
584 = build_binary_op (attribute == Attr_Pred
585 ? MINUS_EXPR : PLUS_EXPR,
586 gnu_result_type, gnu_expr,
587 convert (gnu_result_type, integer_one_node));
591 case Attr_Unrestricted_Access:
592 /* Conversions don't change something's address but can cause us to miss
593 the COMPONENT_REF case below, so strip them off. */
594 gnu_prefix = remove_conversions (gnu_prefix,
595 !Must_Be_Byte_Aligned (gnat_node));
597 /* If we are taking 'Address of an unconstrained object, this is the
598 pointer to the underlying array. */
599 if (attribute == Attr_Address)
600 gnu_prefix = maybe_unconstrained_array (gnu_prefix);
602 /* ... fall through ... */
605 case Attr_Unchecked_Access:
606 case Attr_Code_Address:
607 gnu_result_type = get_unpadded_type (Etype (gnat_node));
609 = build_unary_op (((attribute == Attr_Address
610 || attribute == Attr_Unrestricted_Access)
611 && !Must_Be_Byte_Aligned (gnat_node))
612 ? ATTR_ADDR_EXPR : ADDR_EXPR,
613 gnu_result_type, gnu_prefix);
615 /* For 'Code_Address, find an inner ADDR_EXPR and mark it so that we
616 don't try to build a trampoline. */
617 if (attribute == Attr_Code_Address)
619 for (gnu_expr = gnu_result;
620 TREE_CODE (gnu_expr) == NOP_EXPR
621 || TREE_CODE (gnu_expr) == CONVERT_EXPR;
622 gnu_expr = TREE_OPERAND (gnu_expr, 0))
623 TREE_CONSTANT (gnu_expr) = 1;
625 if (TREE_CODE (gnu_expr) == ADDR_EXPR)
626 TREE_STATIC (gnu_expr) = TREE_CONSTANT (gnu_expr) = 1;
630 case Attr_Pool_Address:
633 tree gnu_ptr = gnu_prefix;
635 gnu_result_type = get_unpadded_type (Etype (gnat_node));
637 /* If this is an unconstrained array, we know the object must have been
638 allocated with the template in front of the object. So compute the
640 if (TYPE_FAT_POINTER_P (TREE_TYPE (gnu_ptr)))
642 = convert (build_pointer_type
643 (TYPE_OBJECT_RECORD_TYPE
644 (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr)))),
647 gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr));
648 if (TREE_CODE (gnu_obj_type) == RECORD_TYPE
649 && TYPE_CONTAINS_TEMPLATE_P (gnu_obj_type))
651 tree gnu_char_ptr_type = build_pointer_type (char_type_node);
652 tree gnu_pos = byte_position (TYPE_FIELDS (gnu_obj_type));
654 = convert (gnu_char_ptr_type,
655 size_diffop (size_zero_node, gnu_pos));
657 gnu_ptr = convert (gnu_char_ptr_type, gnu_ptr);
658 gnu_ptr = build_binary_op (MINUS_EXPR, gnu_char_ptr_type,
659 gnu_ptr, gnu_byte_offset);
662 gnu_result = convert (gnu_result_type, gnu_ptr);
667 case Attr_Object_Size:
668 case Attr_Value_Size:
669 case Attr_Max_Size_In_Storage_Elements:
670 gnu_expr = gnu_prefix;
672 /* Remove NOPS from gnu_expr and conversions from gnu_prefix.
673 We only use GNU_EXPR to see if a COMPONENT_REF was involved. */
674 while (TREE_CODE (gnu_expr) == NOP_EXPR)
675 gnu_expr = TREE_OPERAND (gnu_expr, 0)
678 gnu_prefix = remove_conversions (gnu_prefix, true);
679 prefix_unused = true;
680 gnu_type = TREE_TYPE (gnu_prefix);
682 /* Replace an unconstrained array type with the type of the underlying
683 array. We can't do this with a call to maybe_unconstrained_array
684 since we may have a TYPE_DECL. For 'Max_Size_In_Storage_Elements,
685 use the record type that will be used to allocate the object and its
687 if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
689 gnu_type = TYPE_OBJECT_RECORD_TYPE (gnu_type);
690 if (attribute != Attr_Max_Size_In_Storage_Elements)
691 gnu_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)));
694 /* If we're looking for the size of a field, return the field size.
695 Otherwise, if the prefix is an object, or if 'Object_Size or
696 'Max_Size_In_Storage_Elements has been specified, the result is the
697 GCC size of the type. Otherwise, the result is the RM_Size of the
699 if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
700 gnu_result = DECL_SIZE (TREE_OPERAND (gnu_prefix, 1));
701 else if (TREE_CODE (gnu_prefix) != TYPE_DECL
702 || attribute == Attr_Object_Size
703 || attribute == Attr_Max_Size_In_Storage_Elements)
705 /* If this is a padded type, the GCC size isn't relevant to the
706 programmer. Normally, what we want is the RM_Size, which was set
707 from the specified size, but if it was not set, we want the size
708 of the relevant field. Using the MAX of those two produces the
709 right result in all case. Don't use the size of the field if it's
710 a self-referential type, since that's never what's wanted. */
711 if (TREE_CODE (gnu_type) == RECORD_TYPE
712 && TYPE_IS_PADDING_P (gnu_type)
713 && TREE_CODE (gnu_expr) == COMPONENT_REF)
715 gnu_result = rm_size (gnu_type);
716 if (!(CONTAINS_PLACEHOLDER_P
717 (DECL_SIZE (TREE_OPERAND (gnu_expr, 1)))))
719 = size_binop (MAX_EXPR, gnu_result,
720 DECL_SIZE (TREE_OPERAND (gnu_expr, 1)));
723 gnu_result = TYPE_SIZE (gnu_type);
726 gnu_result = rm_size (gnu_type);
728 gcc_assert (gnu_result);
730 /* Deal with a self-referential size by returning the maximum size for a
731 type and by qualifying the size with the object for 'Size of an
733 if (CONTAINS_PLACEHOLDER_P (gnu_result))
735 if (TREE_CODE (gnu_prefix) != TYPE_DECL)
736 gnu_result = substitute_placeholder_in_expr (gnu_result, gnu_expr);
738 gnu_result = max_size (gnu_result, true);
741 /* If the type contains a template, subtract its size. */
742 if (TREE_CODE (gnu_type) == RECORD_TYPE
743 && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
744 gnu_result = size_binop (MINUS_EXPR, gnu_result,
745 DECL_SIZE (TYPE_FIELDS (gnu_type)));
747 gnu_result_type = get_unpadded_type (Etype (gnat_node));
749 /* Always perform division using unsigned arithmetic as the size cannot
750 be negative, but may be an overflowed positive value. This provides
751 correct results for sizes up to 512 MB.
753 ??? Size should be calculated in storage elements directly. */
755 if (attribute == Attr_Max_Size_In_Storage_Elements)
756 gnu_result = convert (sizetype,
757 fold (build2 (CEIL_DIV_EXPR, bitsizetype,
758 gnu_result, bitsize_unit_node)));
762 if (TREE_CODE (gnu_prefix) == COMPONENT_REF
763 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))
765 && (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))))
766 gnu_prefix = TREE_OPERAND (gnu_prefix, 0);
768 gnu_type = TREE_TYPE (gnu_prefix);
769 gnu_result_type = get_unpadded_type (Etype (gnat_node));
770 prefix_unused = true;
772 if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
773 gnu_result = size_int (DECL_ALIGN (TREE_OPERAND (gnu_prefix, 1)));
775 gnu_result = size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT);
780 case Attr_Range_Length:
781 prefix_unused = true;
783 if (INTEGRAL_TYPE_P (gnu_type) || TREE_CODE (gnu_type) == REAL_TYPE)
785 gnu_result_type = get_unpadded_type (Etype (gnat_node));
787 if (attribute == Attr_First)
788 gnu_result = TYPE_MIN_VALUE (gnu_type);
789 else if (attribute == Attr_Last)
790 gnu_result = TYPE_MAX_VALUE (gnu_type);
794 (MAX_EXPR, get_base_type (gnu_result_type),
796 (PLUS_EXPR, get_base_type (gnu_result_type),
797 build_binary_op (MINUS_EXPR,
798 get_base_type (gnu_result_type),
799 convert (gnu_result_type,
800 TYPE_MAX_VALUE (gnu_type)),
801 convert (gnu_result_type,
802 TYPE_MIN_VALUE (gnu_type))),
803 convert (gnu_result_type, integer_one_node)),
804 convert (gnu_result_type, integer_zero_node));
809 /* ... fall through ... */
813 int Dimension = (Present (Expressions (gnat_node))
814 ? UI_To_Int (Intval (First (Expressions (gnat_node))))
817 /* Make sure any implicit dereference gets done. */
818 gnu_prefix = maybe_implicit_deref (gnu_prefix);
819 gnu_prefix = maybe_unconstrained_array (gnu_prefix);
820 gnu_type = TREE_TYPE (gnu_prefix);
821 prefix_unused = true;
822 gnu_result_type = get_unpadded_type (Etype (gnat_node));
824 if (TYPE_CONVENTION_FORTRAN_P (gnu_type))
829 for (ndim = 1, gnu_type_temp = gnu_type;
830 TREE_CODE (TREE_TYPE (gnu_type_temp)) == ARRAY_TYPE
831 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type_temp));
832 ndim++, gnu_type_temp = TREE_TYPE (gnu_type_temp))
835 Dimension = ndim + 1 - Dimension;
838 for (; Dimension > 1; Dimension--)
839 gnu_type = TREE_TYPE (gnu_type);
841 gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE);
842 if (attribute == Attr_First)
844 = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)));
845 else if (attribute == Attr_Last)
847 = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)));
849 /* 'Length or 'Range_Length. */
851 tree gnu_compute_type
852 = gnat_signed_or_unsigned_type (0,
853 get_base_type (gnu_result_type));
857 (MAX_EXPR, gnu_compute_type,
859 (PLUS_EXPR, gnu_compute_type,
861 (MINUS_EXPR, gnu_compute_type,
862 convert (gnu_compute_type,
864 (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)))),
865 convert (gnu_compute_type,
867 (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))))),
868 convert (gnu_compute_type, integer_one_node)),
869 convert (gnu_compute_type, integer_zero_node));
872 /* If this has a PLACEHOLDER_EXPR, qualify it by the object we are
873 handling. Note that these attributes could not have been used on
874 an unconstrained array type. */
875 gnu_result = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result,
880 case Attr_Bit_Position:
886 HOST_WIDE_INT bitsize;
887 HOST_WIDE_INT bitpos;
889 tree gnu_field_bitpos;
890 tree gnu_field_offset;
892 enum machine_mode mode;
893 int unsignedp, volatilep;
895 gnu_result_type = get_unpadded_type (Etype (gnat_node));
896 gnu_prefix = remove_conversions (gnu_prefix, true);
897 prefix_unused = true;
899 /* We can have 'Bit on any object, but if it isn't a COMPONENT_REF,
900 the result is 0. Don't allow 'Bit on a bare component, though. */
901 if (attribute == Attr_Bit
902 && TREE_CODE (gnu_prefix) != COMPONENT_REF
903 && TREE_CODE (gnu_prefix) != FIELD_DECL)
905 gnu_result = integer_zero_node;
910 gcc_assert (TREE_CODE (gnu_prefix) == COMPONENT_REF
911 || (attribute == Attr_Bit_Position
912 && TREE_CODE (gnu_prefix) == FIELD_DECL));
914 get_inner_reference (gnu_prefix, &bitsize, &bitpos, &gnu_offset,
915 &mode, &unsignedp, &volatilep, false);
917 if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
919 gnu_field_bitpos = bit_position (TREE_OPERAND (gnu_prefix, 1));
920 gnu_field_offset = byte_position (TREE_OPERAND (gnu_prefix, 1));
922 for (gnu_inner = TREE_OPERAND (gnu_prefix, 0);
923 TREE_CODE (gnu_inner) == COMPONENT_REF
924 && DECL_INTERNAL_P (TREE_OPERAND (gnu_inner, 1));
925 gnu_inner = TREE_OPERAND (gnu_inner, 0))
928 = size_binop (PLUS_EXPR, gnu_field_bitpos,
929 bit_position (TREE_OPERAND (gnu_inner, 1)));
931 = size_binop (PLUS_EXPR, gnu_field_offset,
932 byte_position (TREE_OPERAND (gnu_inner, 1)));
935 else if (TREE_CODE (gnu_prefix) == FIELD_DECL)
937 gnu_field_bitpos = bit_position (gnu_prefix);
938 gnu_field_offset = byte_position (gnu_prefix);
942 gnu_field_bitpos = bitsize_zero_node;
943 gnu_field_offset = size_zero_node;
949 gnu_result = gnu_field_offset;
954 gnu_result = size_int (bitpos % BITS_PER_UNIT);
958 gnu_result = bitsize_int (bitpos % BITS_PER_UNIT);
959 gnu_result = size_binop (PLUS_EXPR, gnu_result,
960 TYPE_SIZE (TREE_TYPE (gnu_prefix)));
961 gnu_result = size_binop (MINUS_EXPR, gnu_result,
965 case Attr_Bit_Position:
966 gnu_result = gnu_field_bitpos;
970 /* If this has a PLACEHOLDER_EXPR, qualify it by the object
972 gnu_result = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result, gnu_prefix);
979 tree gnu_lhs = gnat_to_gnu (First (Expressions (gnat_node)));
980 tree gnu_rhs = gnat_to_gnu (Next (First (Expressions (gnat_node))));
982 gnu_result_type = get_unpadded_type (Etype (gnat_node));
983 gnu_result = build_binary_op (attribute == Attr_Min
984 ? MIN_EXPR : MAX_EXPR,
985 gnu_result_type, gnu_lhs, gnu_rhs);
989 case Attr_Passed_By_Reference:
990 gnu_result = size_int (default_pass_by_ref (gnu_type)
991 || must_pass_by_ref (gnu_type));
992 gnu_result_type = get_unpadded_type (Etype (gnat_node));
995 case Attr_Component_Size:
996 if (TREE_CODE (gnu_prefix) == COMPONENT_REF
997 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))
999 && (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))))
1000 gnu_prefix = TREE_OPERAND (gnu_prefix, 0);
1002 gnu_prefix = maybe_implicit_deref (gnu_prefix);
1003 gnu_type = TREE_TYPE (gnu_prefix);
1005 if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
1006 gnu_type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_type))));
1008 while (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
1009 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
1010 gnu_type = TREE_TYPE (gnu_type);
1012 gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE);
1014 /* Note this size cannot be self-referential. */
1015 gnu_result = TYPE_SIZE (TREE_TYPE (gnu_type));
1016 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1017 prefix_unused = true;
1020 case Attr_Null_Parameter:
1021 /* This is just a zero cast to the pointer type for
1022 our prefix and dereferenced. */
1023 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1025 = build_unary_op (INDIRECT_REF, NULL_TREE,
1026 convert (build_pointer_type (gnu_result_type),
1027 integer_zero_node));
1028 TREE_PRIVATE (gnu_result) = 1;
1031 case Attr_Mechanism_Code:
1034 Entity_Id gnat_obj = Entity (Prefix (gnat_node));
1036 prefix_unused = true;
1037 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1038 if (Present (Expressions (gnat_node)))
1040 int i = UI_To_Int (Intval (First (Expressions (gnat_node))));
1042 for (gnat_obj = First_Formal (gnat_obj); i > 1;
1043 i--, gnat_obj = Next_Formal (gnat_obj))
1047 code = Mechanism (gnat_obj);
1048 if (code == Default)
1049 code = ((present_gnu_tree (gnat_obj)
1050 && (DECL_BY_REF_P (get_gnu_tree (gnat_obj))
1051 || ((TREE_CODE (get_gnu_tree (gnat_obj))
1053 && (DECL_BY_COMPONENT_PTR_P
1054 (get_gnu_tree (gnat_obj))))))
1055 ? By_Reference : By_Copy);
1056 gnu_result = convert (gnu_result_type, size_int (- code));
1061 /* Say we have an unimplemented attribute. Then set the value to be
1062 returned to be a zero and hope that's something we can convert to the
1063 type of this attribute. */
1064 post_error ("unimplemented attribute", gnat_node);
1065 gnu_result_type = get_unpadded_type (Etype (gnat_node));
1066 gnu_result = integer_zero_node;
1070 /* If this is an attribute where the prefix was unused, force a use of it if
1071 it has a side-effect. But don't do it if the prefix is just an entity
1072 name. However, if an access check is needed, we must do it. See second
1073 example in AARM 11.6(5.e). */
1074 if (prefix_unused && TREE_SIDE_EFFECTS (gnu_prefix)
1075 && !Is_Entity_Name (Prefix (gnat_node)))
1076 gnu_result = fold (build2 (COMPOUND_EXPR, TREE_TYPE (gnu_result),
1077 gnu_prefix, gnu_result));
1079 *gnu_result_type_p = gnu_result_type;
1083 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Case_Statement,
1084 to a GCC tree, which is returned. */
1087 Case_Statement_to_gnu (Node_Id gnat_node)
1093 gnu_expr = gnat_to_gnu (Expression (gnat_node));
1094 gnu_expr = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
1096 /* The range of values in a case statement is determined by the rules in
1097 RM 5.4(7-9). In almost all cases, this range is represented by the Etype
1098 of the expression. One exception arises in the case of a simple name that
1099 is parenthesized. This still has the Etype of the name, but since it is
1100 not a name, para 7 does not apply, and we need to go to the base type.
1101 This is the only case where parenthesization affects the dynamic
1102 semantics (i.e. the range of possible values at runtime that is covered
1103 by the others alternative.
1105 Another exception is if the subtype of the expression is non-static. In
1106 that case, we also have to use the base type. */
1107 if (Paren_Count (Expression (gnat_node)) != 0
1108 || !Is_OK_Static_Subtype (Underlying_Type
1109 (Etype (Expression (gnat_node)))))
1110 gnu_expr = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
1112 /* We build a SWITCH_EXPR that contains the code with interspersed
1113 CASE_LABEL_EXPRs for each label. */
1115 push_stack (&gnu_switch_label_stack, NULL_TREE, create_artificial_label ());
1116 start_stmt_group ();
1117 for (gnat_when = First_Non_Pragma (Alternatives (gnat_node));
1118 Present (gnat_when);
1119 gnat_when = Next_Non_Pragma (gnat_when))
1121 Node_Id gnat_choice;
1123 /* First compile all the different case choices for the current WHEN
1125 for (gnat_choice = First (Discrete_Choices (gnat_when));
1126 Present (gnat_choice); gnat_choice = Next (gnat_choice))
1128 tree gnu_low = NULL_TREE, gnu_high = NULL_TREE;
1130 switch (Nkind (gnat_choice))
1133 gnu_low = gnat_to_gnu (Low_Bound (gnat_choice));
1134 gnu_high = gnat_to_gnu (High_Bound (gnat_choice));
1137 case N_Subtype_Indication:
1138 gnu_low = gnat_to_gnu (Low_Bound (Range_Expression
1139 (Constraint (gnat_choice))));
1140 gnu_high = gnat_to_gnu (High_Bound (Range_Expression
1141 (Constraint (gnat_choice))));
1145 case N_Expanded_Name:
1146 /* This represents either a subtype range or a static value of
1147 some kind; Ekind says which. If a static value, fall through
1148 to the next case. */
1149 if (IN (Ekind (Entity (gnat_choice)), Type_Kind))
1151 tree gnu_type = get_unpadded_type (Entity (gnat_choice));
1153 gnu_low = fold (TYPE_MIN_VALUE (gnu_type));
1154 gnu_high = fold (TYPE_MAX_VALUE (gnu_type));
1158 /* ... fall through ... */
1160 case N_Character_Literal:
1161 case N_Integer_Literal:
1162 gnu_low = gnat_to_gnu (gnat_choice);
1165 case N_Others_Choice:
1172 add_stmt_with_node (build3 (CASE_LABEL_EXPR, void_type_node,
1174 create_artificial_label ()),
1178 /* Push a binding level here in case variables are declared since we want
1179 them to be local to this set of statements instead of the block
1180 containing the Case statement. */
1181 add_stmt (build_stmt_group (Statements (gnat_when), true));
1182 add_stmt (build1 (GOTO_EXPR, void_type_node,
1183 TREE_VALUE (gnu_switch_label_stack)));
1186 /* Now emit a definition of the label all the cases branched to. */
1187 add_stmt (build1 (LABEL_EXPR, void_type_node,
1188 TREE_VALUE (gnu_switch_label_stack)));
1189 gnu_result = build3 (SWITCH_EXPR, TREE_TYPE (gnu_expr), gnu_expr,
1190 end_stmt_group (), NULL_TREE);
1191 pop_stack (&gnu_switch_label_stack);
1196 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Loop_Statement,
1197 to a GCC tree, which is returned. */
1200 Loop_Statement_to_gnu (Node_Id gnat_node)
1202 /* ??? It would be nice to use "build" here, but there's no build5. */
1203 tree gnu_loop_stmt = build_nt (LOOP_STMT, NULL_TREE, NULL_TREE,
1204 NULL_TREE, NULL_TREE, NULL_TREE);
1205 tree gnu_loop_var = NULL_TREE;
1206 Node_Id gnat_iter_scheme = Iteration_Scheme (gnat_node);
1207 tree gnu_cond_expr = NULL_TREE;
1210 TREE_TYPE (gnu_loop_stmt) = void_type_node;
1211 TREE_SIDE_EFFECTS (gnu_loop_stmt) = 1;
1212 LOOP_STMT_LABEL (gnu_loop_stmt) = create_artificial_label ();
1213 annotate_with_node (gnu_loop_stmt, gnat_node);
1215 /* Save the end label of this LOOP_STMT in a stack so that the corresponding
1216 N_Exit_Statement can find it. */
1217 push_stack (&gnu_loop_label_stack, NULL_TREE,
1218 LOOP_STMT_LABEL (gnu_loop_stmt));
1220 /* Set the condition that under which the loop should continue.
1221 For "LOOP .... END LOOP;" the condition is always true. */
1222 if (No (gnat_iter_scheme))
1224 /* The case "WHILE condition LOOP ..... END LOOP;" */
1225 else if (Present (Condition (gnat_iter_scheme)))
1226 LOOP_STMT_TOP_COND (gnu_loop_stmt)
1227 = gnat_to_gnu (Condition (gnat_iter_scheme));
1230 /* We have an iteration scheme. */
1231 Node_Id gnat_loop_spec = Loop_Parameter_Specification (gnat_iter_scheme);
1232 Entity_Id gnat_loop_var = Defining_Entity (gnat_loop_spec);
1233 Entity_Id gnat_type = Etype (gnat_loop_var);
1234 tree gnu_type = get_unpadded_type (gnat_type);
1235 tree gnu_low = TYPE_MIN_VALUE (gnu_type);
1236 tree gnu_high = TYPE_MAX_VALUE (gnu_type);
1237 bool reversep = Reverse_Present (gnat_loop_spec);
1238 tree gnu_first = reversep ? gnu_high : gnu_low;
1239 tree gnu_last = reversep ? gnu_low : gnu_high;
1240 enum tree_code end_code = reversep ? GE_EXPR : LE_EXPR;
1241 tree gnu_base_type = get_base_type (gnu_type);
1242 tree gnu_limit = (reversep ? TYPE_MIN_VALUE (gnu_base_type)
1243 : TYPE_MAX_VALUE (gnu_base_type));
1245 /* We know the loop variable will not overflow if GNU_LAST is a constant
1246 and is not equal to GNU_LIMIT. If it might overflow, we have to move
1247 the limit test to the end of the loop. In that case, we have to test
1248 for an empty loop outside the loop. */
1249 if (TREE_CODE (gnu_last) != INTEGER_CST
1250 || TREE_CODE (gnu_limit) != INTEGER_CST
1251 || tree_int_cst_equal (gnu_last, gnu_limit))
1254 = build3 (COND_EXPR, void_type_node,
1255 build_binary_op (LE_EXPR, integer_type_node,
1257 NULL_TREE, alloc_stmt_list ());
1258 annotate_with_node (gnu_cond_expr, gnat_loop_spec);
1261 /* Open a new nesting level that will surround the loop to declare the
1262 loop index variable. */
1263 start_stmt_group ();
1266 /* Declare the loop index and set it to its initial value. */
1267 gnu_loop_var = gnat_to_gnu_entity (gnat_loop_var, gnu_first, 1);
1268 if (DECL_BY_REF_P (gnu_loop_var))
1269 gnu_loop_var = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_loop_var);
1271 /* The loop variable might be a padded type, so use `convert' to get a
1272 reference to the inner variable if so. */
1273 gnu_loop_var = convert (get_base_type (gnu_type), gnu_loop_var);
1275 /* Set either the top or bottom exit condition as appropriate depending
1276 on whether or not we know an overflow cannot occur. */
1278 LOOP_STMT_BOT_COND (gnu_loop_stmt)
1279 = build_binary_op (NE_EXPR, integer_type_node,
1280 gnu_loop_var, gnu_last);
1282 LOOP_STMT_TOP_COND (gnu_loop_stmt)
1283 = build_binary_op (end_code, integer_type_node,
1284 gnu_loop_var, gnu_last);
1286 LOOP_STMT_UPDATE (gnu_loop_stmt)
1287 = build_binary_op (reversep ? PREDECREMENT_EXPR
1288 : PREINCREMENT_EXPR,
1289 TREE_TYPE (gnu_loop_var),
1291 convert (TREE_TYPE (gnu_loop_var),
1293 annotate_with_node (LOOP_STMT_UPDATE (gnu_loop_stmt),
1297 /* If the loop was named, have the name point to this loop. In this case,
1298 the association is not a ..._DECL node, but the end label from this
1300 if (Present (Identifier (gnat_node)))
1301 save_gnu_tree (Entity (Identifier (gnat_node)),
1302 LOOP_STMT_LABEL (gnu_loop_stmt), true);
1304 /* Make the loop body into its own block, so any allocated storage will be
1305 released every iteration. This is needed for stack allocation. */
1306 LOOP_STMT_BODY (gnu_loop_stmt)
1307 = build_stmt_group (Statements (gnat_node), true);
1309 /* If we declared a variable, then we are in a statement group for that
1310 declaration. Add the LOOP_STMT to it and make that the "loop". */
1313 add_stmt (gnu_loop_stmt);
1315 gnu_loop_stmt = end_stmt_group ();
1318 /* If we have an outer COND_EXPR, that's our result and this loop is its
1319 "true" statement. Otherwise, the result is the LOOP_STMT. */
1322 COND_EXPR_THEN (gnu_cond_expr) = gnu_loop_stmt;
1323 gnu_result = gnu_cond_expr;
1324 recalculate_side_effects (gnu_cond_expr);
1327 gnu_result = gnu_loop_stmt;
1329 pop_stack (&gnu_loop_label_stack);
1334 /* Subroutine of gnat_to_gnu to process gnat_node, an N_Subprogram_Body. We
1335 don't return anything. */
1338 Subprogram_Body_to_gnu (Node_Id gnat_node)
1340 /* Save debug output mode in case it is reset. */
1341 enum debug_info_type save_write_symbols = write_symbols;
1342 const struct gcc_debug_hooks *const save_debug_hooks = debug_hooks;
1343 /* Defining identifier of a parameter to the subprogram. */
1344 Entity_Id gnat_param;
1345 /* The defining identifier for the subprogram body. Note that if a
1346 specification has appeared before for this body, then the identifier
1347 occurring in that specification will also be a defining identifier and all
1348 the calls to this subprogram will point to that specification. */
1349 Entity_Id gnat_subprog_id
1350 = (Present (Corresponding_Spec (gnat_node))
1351 ? Corresponding_Spec (gnat_node) : Defining_Entity (gnat_node));
1352 /* The FUNCTION_DECL node corresponding to the subprogram spec. */
1353 tree gnu_subprog_decl;
1354 /* The FUNCTION_TYPE node corresponding to the subprogram spec. */
1355 tree gnu_subprog_type;
1359 /* If this is a generic object or if it has been eliminated,
1361 if (Ekind (gnat_subprog_id) == E_Generic_Procedure
1362 || Ekind (gnat_subprog_id) == E_Generic_Function
1363 || Is_Eliminated (gnat_subprog_id))
1366 /* If debug information is suppressed for the subprogram, turn debug
1367 mode off for the duration of processing. */
1368 if (!Needs_Debug_Info (gnat_subprog_id))
1370 write_symbols = NO_DEBUG;
1371 debug_hooks = &do_nothing_debug_hooks;
1374 /* If this subprogram acts as its own spec, define it. Otherwise, just get
1375 the already-elaborated tree node. However, if this subprogram had its
1376 elaboration deferred, we will already have made a tree node for it. So
1377 treat it as not being defined in that case. Such a subprogram cannot
1378 have an address clause or a freeze node, so this test is safe, though it
1379 does disable some otherwise-useful error checking. */
1381 = gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE,
1382 Acts_As_Spec (gnat_node)
1383 && !present_gnu_tree (gnat_subprog_id));
1385 gnu_subprog_type = TREE_TYPE (gnu_subprog_decl);
1387 /* Set the line number in the decl to correspond to that of the body so that
1388 the line number notes are written
1390 Sloc_to_locus (Sloc (gnat_node), &DECL_SOURCE_LOCATION (gnu_subprog_decl));
1392 begin_subprog_body (gnu_subprog_decl);
1393 gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type);
1395 /* If there are OUT parameters, we need to ensure that the return statement
1396 properly copies them out. We do this by making a new block and converting
1397 any inner return into a goto to a label at the end of the block. */
1398 push_stack (&gnu_return_label_stack, NULL_TREE,
1399 gnu_cico_list ? create_artificial_label () : NULL_TREE);
1401 /* Get a tree corresponding to the code for the subprogram. */
1402 start_stmt_group ();
1405 /* See if there are any parameters for which we don't yet have GCC entities.
1406 These must be for OUT parameters for which we will be making VAR_DECL
1407 nodes here. Fill them in to TYPE_CI_CO_LIST, which must contain the empty
1408 entry as well. We can match up the entries because TYPE_CI_CO_LIST is in
1409 the order of the parameters. */
1410 for (gnat_param = First_Formal (gnat_subprog_id);
1411 Present (gnat_param);
1412 gnat_param = Next_Formal_With_Extras (gnat_param))
1413 if (!present_gnu_tree (gnat_param))
1415 /* Skip any entries that have been already filled in; they must
1416 correspond to IN OUT parameters. */
1417 for (; gnu_cico_list && TREE_VALUE (gnu_cico_list);
1418 gnu_cico_list = TREE_CHAIN (gnu_cico_list))
1421 /* Do any needed references for padded types. */
1422 TREE_VALUE (gnu_cico_list)
1423 = convert (TREE_TYPE (TREE_PURPOSE (gnu_cico_list)),
1424 gnat_to_gnu_entity (gnat_param, NULL_TREE, 1));
1427 process_decls (Declarations (gnat_node), Empty, Empty, true, true);
1429 /* Generate the code of the subprogram itself. A return statement will be
1430 present and any OUT parameters will be handled there. */
1431 add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node)));
1433 gnu_result = end_stmt_group ();
1435 /* If we made a special return label, we need to make a block that contains
1436 the definition of that label and the copying to the return value. That
1437 block first contains the function, then the label and copy statement. */
1438 if (TREE_VALUE (gnu_return_label_stack))
1442 start_stmt_group ();
1444 add_stmt (gnu_result);
1445 add_stmt (build1 (LABEL_EXPR, void_type_node,
1446 TREE_VALUE (gnu_return_label_stack)));
1448 gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type);
1449 if (list_length (gnu_cico_list) == 1)
1450 gnu_retval = TREE_VALUE (gnu_cico_list);
1452 gnu_retval = gnat_build_constructor (TREE_TYPE (gnu_subprog_type),
1455 if (DECL_P (gnu_retval) && DECL_BY_REF_P (gnu_retval))
1456 gnu_retval = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_retval);
1459 (build_return_expr (DECL_RESULT (current_function_decl), gnu_retval),
1462 gnu_result = end_stmt_group ();
1465 pop_stack (&gnu_return_label_stack);
1467 /* Initialize the information node for the function and set the
1469 allocate_struct_function (current_function_decl);
1471 ((Present (End_Label (Handled_Statement_Sequence (gnat_node)))
1472 ? Sloc (End_Label (Handled_Statement_Sequence (gnat_node)))
1473 : Sloc (gnat_node)),
1474 &cfun->function_end_locus);
1476 end_subprog_body (gnu_result);
1478 /* Disconnect the trees for parameters that we made variables for from the
1479 GNAT entities since these are unusable after we end the function. */
1480 for (gnat_param = First_Formal (gnat_subprog_id);
1481 Present (gnat_param);
1482 gnat_param = Next_Formal_With_Extras (gnat_param))
1483 if (TREE_CODE (get_gnu_tree (gnat_param)) == VAR_DECL)
1484 save_gnu_tree (gnat_param, NULL_TREE, false);
1486 mark_out_of_scope (Defining_Unit_Name (Specification (gnat_node)));
1487 write_symbols = save_write_symbols;
1488 debug_hooks = save_debug_hooks;
1491 /* Subroutine of gnat_to_gnu to translate gnat_node, either an N_Function_Call
1492 or an N_Procedure_Call_Statement, to a GCC tree, which is returned.
1493 GNU_RESULT_TYPE_P is a pointer to where we should place the result type.
1494 If GNU_TARGET is non-null, this must be a function call and the result
1495 of the call is to be placed into that object. */
1498 call_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, tree gnu_target)
1501 /* The GCC node corresponding to the GNAT subprogram name. This can either
1502 be a FUNCTION_DECL node if we are dealing with a standard subprogram call,
1503 or an indirect reference expression (an INDIRECT_REF node) pointing to a
1505 tree gnu_subprog_node = gnat_to_gnu (Name (gnat_node));
1506 /* The FUNCTION_TYPE node giving the GCC type of the subprogram. */
1507 tree gnu_subprog_type = TREE_TYPE (gnu_subprog_node);
1508 tree gnu_subprog_addr = build_unary_op (ADDR_EXPR, NULL_TREE,
1510 Entity_Id gnat_formal;
1511 Node_Id gnat_actual;
1512 tree gnu_actual_list = NULL_TREE;
1513 tree gnu_name_list = NULL_TREE;
1514 tree gnu_before_list = NULL_TREE;
1515 tree gnu_after_list = NULL_TREE;
1516 tree gnu_subprog_call;
1518 switch (Nkind (Name (gnat_node)))
1521 case N_Operator_Symbol:
1522 case N_Expanded_Name:
1523 case N_Attribute_Reference:
1524 if (Is_Eliminated (Entity (Name (gnat_node))))
1525 Eliminate_Error_Msg (gnat_node, Entity (Name (gnat_node)));
1528 gcc_assert (TREE_CODE (gnu_subprog_type) == FUNCTION_TYPE);
1530 /* If we are calling a stubbed function, make this into a raise of
1531 Program_Error. Elaborate all our args first. */
1532 if (TREE_CODE (gnu_subprog_node) == FUNCTION_DECL
1533 && DECL_STUBBED_P (gnu_subprog_node))
1535 for (gnat_actual = First_Actual (gnat_node);
1536 Present (gnat_actual);
1537 gnat_actual = Next_Actual (gnat_actual))
1538 add_stmt (gnat_to_gnu (gnat_actual));
1540 if (Nkind (gnat_node) == N_Function_Call && !gnu_target)
1542 *gnu_result_type_p = TREE_TYPE (gnu_subprog_type);
1543 return build1 (NULL_EXPR, *gnu_result_type_p,
1544 build_call_raise (PE_Stubbed_Subprogram_Called));
1547 return build_call_raise (PE_Stubbed_Subprogram_Called);
1550 /* If we are calling by supplying a pointer to a target, set up that
1551 pointer as the first argument. Use GNU_TARGET if one was passed;
1552 otherwise, make a target by building a variable of the maximum size
1554 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
1556 tree gnu_real_ret_type
1557 = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (gnu_subprog_type)));
1562 = maybe_pad_type (gnu_real_ret_type,
1563 max_size (TYPE_SIZE (gnu_real_ret_type), true),
1564 0, Etype (Name (gnat_node)), "PAD", false,
1567 gnu_target = create_tmp_var_raw (gnu_obj_type, "LR");
1568 gnat_pushdecl (gnu_target, gnat_node);
1572 = tree_cons (NULL_TREE,
1573 build_unary_op (ADDR_EXPR, NULL_TREE,
1574 unchecked_convert (gnu_real_ret_type,
1581 /* The only way we can be making a call via an access type is if Name is an
1582 explicit dereference. In that case, get the list of formal args from the
1583 type the access type is pointing to. Otherwise, get the formals from
1584 entity being called. */
1585 if (Nkind (Name (gnat_node)) == N_Explicit_Dereference)
1586 gnat_formal = First_Formal (Etype (Name (gnat_node)));
1587 else if (Nkind (Name (gnat_node)) == N_Attribute_Reference)
1588 /* Assume here that this must be 'Elab_Body or 'Elab_Spec. */
1591 gnat_formal = First_Formal (Entity (Name (gnat_node)));
1593 /* Create the list of the actual parameters as GCC expects it, namely a chain
1594 of TREE_LIST nodes in which the TREE_VALUE field of each node is a
1595 parameter-expression and the TREE_PURPOSE field is null. Skip OUT
1596 parameters not passed by reference and don't need to be copied in. */
1597 for (gnat_actual = First_Actual (gnat_node);
1598 Present (gnat_actual);
1599 gnat_formal = Next_Formal_With_Extras (gnat_formal),
1600 gnat_actual = Next_Actual (gnat_actual))
1603 = (present_gnu_tree (gnat_formal)
1604 ? get_gnu_tree (gnat_formal) : NULL_TREE);
1605 /* We treat a conversion between aggregate types as if it is an
1606 unchecked conversion. */
1607 bool unchecked_convert_p
1608 = (Nkind (gnat_actual) == N_Unchecked_Type_Conversion
1609 || (Nkind (gnat_actual) == N_Type_Conversion
1610 && Is_Composite_Type (Underlying_Type (Etype (gnat_formal)))));
1611 Node_Id gnat_name = (unchecked_convert_p
1612 ? Expression (gnat_actual) : gnat_actual);
1613 tree gnu_name = gnat_to_gnu (gnat_name);
1614 tree gnu_name_type = gnat_to_gnu_type (Etype (gnat_name));
1616 tree gnu_formal_type;
1618 /* If it's possible we may need to use this expression twice, make sure
1619 than any side-effects are handled via SAVE_EXPRs. Likewise if we need
1620 to force side-effects before the call.
1622 ??? This is more conservative than we need since we don't need to do
1623 this for pass-by-ref with no conversion. If we are passing a
1624 non-addressable Out or In Out parameter by reference, pass the address
1625 of a copy and set up to copy back out after the call. */
1626 if (Ekind (gnat_formal) != E_In_Parameter)
1628 gnu_name = gnat_stabilize_reference (gnu_name, true);
1629 if (!addressable_p (gnu_name)
1631 && (DECL_BY_REF_P (gnu_formal)
1632 || (TREE_CODE (gnu_formal) == PARM_DECL
1633 && (DECL_BY_COMPONENT_PTR_P (gnu_formal)
1634 || (DECL_BY_DESCRIPTOR_P (gnu_formal))))))
1636 tree gnu_copy = gnu_name;
1639 /* For users of Starlet we issue a warning because the
1640 interface apparently assumes that by-ref parameters
1641 outlive the procedure invocation. The code still
1642 will not work as intended, but we cannot do much
1643 better since other low-level parts of the back-end
1644 would allocate temporaries at will because of the
1645 misalignment if we did not do so here. */
1647 if (Is_Valued_Procedure (Entity (Name (gnat_node))))
1650 ("?possible violation of implicit assumption",
1653 ("?made by pragma Import_Valued_Procedure on &",
1654 gnat_actual, Entity (Name (gnat_node)));
1656 ("?because of misalignment of &",
1657 gnat_actual, gnat_formal);
1660 /* Remove any unpadding on the actual and make a copy. But if
1661 the actual is a justified modular type, first convert
1663 if (TREE_CODE (gnu_name) == COMPONENT_REF
1664 && ((TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_name, 0)))
1666 && (TYPE_IS_PADDING_P
1667 (TREE_TYPE (TREE_OPERAND (gnu_name, 0))))))
1668 gnu_name = gnu_copy = TREE_OPERAND (gnu_name, 0);
1669 else if (TREE_CODE (gnu_name_type) == RECORD_TYPE
1670 && (TYPE_JUSTIFIED_MODULAR_P (gnu_name_type)))
1671 gnu_name = convert (gnu_name_type, gnu_name);
1673 gnu_actual = save_expr (gnu_name);
1675 /* Since we're going to take the address of the SAVE_EXPR, we
1676 don't want it to be marked as unchanging. So set
1677 TREE_ADDRESSABLE. */
1678 gnu_temp = skip_simple_arithmetic (gnu_actual);
1679 if (TREE_CODE (gnu_temp) == SAVE_EXPR)
1681 TREE_ADDRESSABLE (gnu_temp) = 1;
1682 TREE_READONLY (gnu_temp) = 0;
1685 /* Set up to move the copy back to the original. */
1686 gnu_temp = build_binary_op (MODIFY_EXPR, NULL_TREE,
1687 gnu_copy, gnu_actual);
1688 annotate_with_node (gnu_temp, gnat_actual);
1689 append_to_statement_list (gnu_temp, &gnu_after_list);
1693 /* If this was a procedure call, we may not have removed any padding.
1694 So do it here for the part we will use as an input, if any. */
1695 gnu_actual = gnu_name;
1696 if (Ekind (gnat_formal) != E_Out_Parameter
1697 && TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
1698 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual)))
1699 gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)),
1702 /* Unless this is an In parameter, we must remove any LJM building
1704 if (Ekind (gnat_formal) != E_In_Parameter
1705 && TREE_CODE (gnu_name) == CONSTRUCTOR
1706 && TREE_CODE (TREE_TYPE (gnu_name)) == RECORD_TYPE
1707 && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (gnu_name)))
1708 gnu_name = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_name))),
1711 if (Ekind (gnat_formal) != E_Out_Parameter
1712 && !unchecked_convert_p
1713 && Do_Range_Check (gnat_actual))
1714 gnu_actual = emit_range_check (gnu_actual, Etype (gnat_formal));
1716 /* Do any needed conversions. We need only check for unchecked
1717 conversion since normal conversions will be handled by just
1718 converting to the formal type. */
1719 if (unchecked_convert_p)
1722 = unchecked_convert (gnat_to_gnu_type (Etype (gnat_actual)),
1724 (Nkind (gnat_actual)
1725 == N_Unchecked_Type_Conversion)
1726 && No_Truncation (gnat_actual));
1728 /* One we've done the unchecked conversion, we still must ensure that
1729 the object is in range of the formal's type. */
1730 if (Ekind (gnat_formal) != E_Out_Parameter
1731 && Do_Range_Check (gnat_actual))
1732 gnu_actual = emit_range_check (gnu_actual,
1733 Etype (gnat_formal));
1735 else if (TREE_CODE (gnu_actual) != SAVE_EXPR)
1736 /* We may have suppressed a conversion to the Etype of the actual since
1737 the parent is a procedure call. So add the conversion here. */
1738 gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)),
1741 /* If we have not saved a GCC object for the formal, it means it is an
1742 OUT parameter not passed by reference and that does not need to be
1743 copied in. Otherwise, look at the PARM_DECL to see if it is passed by
1746 && TREE_CODE (gnu_formal) == PARM_DECL && DECL_BY_REF_P (gnu_formal))
1748 if (Ekind (gnat_formal) != E_In_Parameter)
1750 gnu_actual = gnu_name;
1752 /* If we have a padded type, be sure we've removed padding. */
1753 if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
1754 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual))
1755 && TREE_CODE (gnu_actual) != SAVE_EXPR)
1756 gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)),
1759 /* If we have the constructed subtype of an aliased object
1760 with an unconstrained nominal subtype, the type of the
1761 actual includes the template, although it is formally
1762 constrained. So we need to convert it back to the real
1763 constructed subtype to retrieve the constrained part
1764 and takes its address. */
1765 if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
1766 && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (gnu_actual))
1767 && TREE_CODE (gnu_actual) != SAVE_EXPR
1768 && Is_Constr_Subt_For_UN_Aliased (Etype (gnat_actual))
1769 && Is_Array_Type (Etype (gnat_actual)))
1770 gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)),
1774 /* Otherwise, if we have a non-addressable COMPONENT_REF of a
1775 variable-size type see if it's doing a unpadding operation. If
1776 so, remove that operation since we have no way of allocating the
1777 required temporary. */
1778 if (TREE_CODE (gnu_actual) == COMPONENT_REF
1779 && !TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual)))
1780 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_actual, 0)))
1782 && TYPE_IS_PADDING_P (TREE_TYPE
1783 (TREE_OPERAND (gnu_actual, 0)))
1784 && !addressable_p (gnu_actual))
1785 gnu_actual = TREE_OPERAND (gnu_actual, 0);
1787 /* The symmetry of the paths to the type of an entity is broken here
1788 since arguments don't know that they will be passed by ref. */
1789 gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal));
1790 gnu_actual = build_unary_op (ADDR_EXPR, gnu_formal_type, gnu_actual);
1792 else if (gnu_formal && TREE_CODE (gnu_formal) == PARM_DECL
1793 && DECL_BY_COMPONENT_PTR_P (gnu_formal))
1795 gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal));
1796 gnu_actual = maybe_implicit_deref (gnu_actual);
1797 gnu_actual = maybe_unconstrained_array (gnu_actual);
1799 if (TREE_CODE (gnu_formal_type) == RECORD_TYPE
1800 && TYPE_IS_PADDING_P (gnu_formal_type))
1802 gnu_formal_type = TREE_TYPE (TYPE_FIELDS (gnu_formal_type));
1803 gnu_actual = convert (gnu_formal_type, gnu_actual);
1806 /* Take the address of the object and convert to the proper pointer
1807 type. We'd like to actually compute the address of the beginning
1808 of the array using an ADDR_EXPR of an ARRAY_REF, but there's a
1809 possibility that the ARRAY_REF might return a constant and we'd be
1810 getting the wrong address. Neither approach is exactly correct,
1811 but this is the most likely to work in all cases. */
1812 gnu_actual = convert (gnu_formal_type,
1813 build_unary_op (ADDR_EXPR, NULL_TREE,
1816 else if (gnu_formal && TREE_CODE (gnu_formal) == PARM_DECL
1817 && DECL_BY_DESCRIPTOR_P (gnu_formal))
1819 /* If arg is 'Null_Parameter, pass zero descriptor. */
1820 if ((TREE_CODE (gnu_actual) == INDIRECT_REF
1821 || TREE_CODE (gnu_actual) == UNCONSTRAINED_ARRAY_REF)
1822 && TREE_PRIVATE (gnu_actual))
1823 gnu_actual = convert (DECL_ARG_TYPE (get_gnu_tree (gnat_formal)),
1826 gnu_actual = build_unary_op (ADDR_EXPR, NULL_TREE,
1827 fill_vms_descriptor (gnu_actual,
1832 tree gnu_actual_size = TYPE_SIZE (TREE_TYPE (gnu_actual));
1834 if (Ekind (gnat_formal) != E_In_Parameter)
1835 gnu_name_list = tree_cons (NULL_TREE, gnu_name, gnu_name_list);
1837 if (!gnu_formal || TREE_CODE (gnu_formal) != PARM_DECL)
1840 /* If this is 'Null_Parameter, pass a zero even though we are
1841 dereferencing it. */
1842 else if (TREE_CODE (gnu_actual) == INDIRECT_REF
1843 && TREE_PRIVATE (gnu_actual)
1844 && host_integerp (gnu_actual_size, 1)
1845 && 0 >= compare_tree_int (gnu_actual_size,
1848 = unchecked_convert (DECL_ARG_TYPE (gnu_formal),
1849 convert (gnat_type_for_size
1850 (tree_low_cst (gnu_actual_size, 1),
1855 gnu_actual = convert (DECL_ARG_TYPE (gnu_formal), gnu_actual);
1858 gnu_actual_list = tree_cons (NULL_TREE, gnu_actual, gnu_actual_list);
1861 gnu_subprog_call = build3 (CALL_EXPR, TREE_TYPE (gnu_subprog_type),
1862 gnu_subprog_addr, nreverse (gnu_actual_list),
1865 /* If we return by passing a target, we emit the call and return the target
1867 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
1869 add_stmt_with_node (gnu_subprog_call, gnat_node);
1871 = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (gnu_subprog_type)));
1872 return unchecked_convert (*gnu_result_type_p, gnu_target, false);
1875 /* If it is a function call, the result is the call expression unless
1876 a target is specified, in which case we copy the result into the target
1877 and return the assignment statement. */
1878 else if (Nkind (gnat_node) == N_Function_Call)
1880 gnu_result = gnu_subprog_call;
1882 /* If the function returns an unconstrained array or by reference,
1883 we have to de-dereference the pointer. */
1884 if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type)
1885 || TYPE_RETURNS_BY_REF_P (gnu_subprog_type))
1886 gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result);
1889 gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE,
1890 gnu_target, gnu_result);
1892 *gnu_result_type_p = get_unpadded_type (Etype (gnat_node));
1897 /* If this is the case where the GNAT tree contains a procedure call
1898 but the Ada procedure has copy in copy out parameters, the special
1899 parameter passing mechanism must be used. */
1900 else if (TYPE_CI_CO_LIST (gnu_subprog_type) != NULL_TREE)
1902 /* List of FIELD_DECLs associated with the PARM_DECLs of the copy
1903 in copy out parameters. */
1904 tree scalar_return_list = TYPE_CI_CO_LIST (gnu_subprog_type);
1905 int length = list_length (scalar_return_list);
1911 gnu_subprog_call = save_expr (gnu_subprog_call);
1912 gnu_name_list = nreverse (gnu_name_list);
1914 /* If any of the names had side-effects, ensure they are all
1915 evaluated before the call. */
1916 for (gnu_name = gnu_name_list; gnu_name;
1917 gnu_name = TREE_CHAIN (gnu_name))
1918 if (TREE_SIDE_EFFECTS (TREE_VALUE (gnu_name)))
1919 append_to_statement_list (TREE_VALUE (gnu_name),
1923 if (Nkind (Name (gnat_node)) == N_Explicit_Dereference)
1924 gnat_formal = First_Formal (Etype (Name (gnat_node)));
1926 gnat_formal = First_Formal (Entity (Name (gnat_node)));
1928 for (gnat_actual = First_Actual (gnat_node);
1929 Present (gnat_actual);
1930 gnat_formal = Next_Formal_With_Extras (gnat_formal),
1931 gnat_actual = Next_Actual (gnat_actual))
1932 /* If we are dealing with a copy in copy out parameter, we must
1933 retrieve its value from the record returned in the call. */
1934 if (!(present_gnu_tree (gnat_formal)
1935 && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
1936 && (DECL_BY_REF_P (get_gnu_tree (gnat_formal))
1937 || (TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
1938 && ((DECL_BY_COMPONENT_PTR_P (get_gnu_tree (gnat_formal))
1939 || (DECL_BY_DESCRIPTOR_P
1940 (get_gnu_tree (gnat_formal))))))))
1941 && Ekind (gnat_formal) != E_In_Parameter)
1943 /* Get the value to assign to this OUT or IN OUT parameter. It is
1944 either the result of the function if there is only a single such
1945 parameter or the appropriate field from the record returned. */
1947 = length == 1 ? gnu_subprog_call
1948 : build_component_ref (gnu_subprog_call, NULL_TREE,
1949 TREE_PURPOSE (scalar_return_list),
1951 bool unchecked_conversion = (Nkind (gnat_actual)
1952 == N_Unchecked_Type_Conversion);
1953 /* If the actual is a conversion, get the inner expression, which
1954 will be the real destination, and convert the result to the
1955 type of the actual parameter. */
1957 = maybe_unconstrained_array (TREE_VALUE (gnu_name_list));
1959 /* If the result is a padded type, remove the padding. */
1960 if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
1961 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result)))
1962 gnu_result = convert (TREE_TYPE (TYPE_FIELDS
1963 (TREE_TYPE (gnu_result))),
1966 /* If the result is a type conversion, do it. */
1967 if (Nkind (gnat_actual) == N_Type_Conversion)
1969 = convert_with_check
1970 (Etype (Expression (gnat_actual)), gnu_result,
1971 Do_Overflow_Check (gnat_actual),
1972 Do_Range_Check (Expression (gnat_actual)),
1973 Float_Truncate (gnat_actual));
1975 else if (unchecked_conversion)
1976 gnu_result = unchecked_convert (TREE_TYPE (gnu_actual),
1978 No_Truncation (gnat_actual));
1981 if (Do_Range_Check (gnat_actual))
1982 gnu_result = emit_range_check (gnu_result,
1983 Etype (gnat_actual));
1985 if (!(!TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual)))
1986 && TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_result)))))
1987 gnu_result = convert (TREE_TYPE (gnu_actual), gnu_result);
1990 gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE,
1991 gnu_actual, gnu_result);
1992 annotate_with_node (gnu_result, gnat_actual);
1993 append_to_statement_list (gnu_result, &gnu_before_list);
1994 scalar_return_list = TREE_CHAIN (scalar_return_list);
1995 gnu_name_list = TREE_CHAIN (gnu_name_list);
2000 annotate_with_node (gnu_subprog_call, gnat_node);
2001 append_to_statement_list (gnu_subprog_call, &gnu_before_list);
2004 append_to_statement_list (gnu_after_list, &gnu_before_list);
2005 return gnu_before_list;
2008 /* Subroutine of gnat_to_gnu to translate gnat_node, an
2009 N_Handled_Sequence_Of_Statements, to a GCC tree, which is returned. */
2012 Handled_Sequence_Of_Statements_to_gnu (Node_Id gnat_node)
2014 tree gnu_jmpsave_decl = NULL_TREE;
2015 tree gnu_jmpbuf_decl = NULL_TREE;
2016 /* If just annotating, ignore all EH and cleanups. */
2017 bool gcc_zcx = (!type_annotate_only
2018 && Present (Exception_Handlers (gnat_node))
2019 && Exception_Mechanism == Back_End_Exceptions);
2021 = (!type_annotate_only && Present (Exception_Handlers (gnat_node))
2022 && Exception_Mechanism == Setjmp_Longjmp);
2023 bool at_end = !type_annotate_only && Present (At_End_Proc (gnat_node));
2024 bool binding_for_block = (at_end || gcc_zcx || setjmp_longjmp);
2025 tree gnu_inner_block; /* The statement(s) for the block itself. */
2030 /* The GCC exception handling mechanism can handle both ZCX and SJLJ schemes
2031 and we have our own SJLJ mechanism. To call the GCC mechanism, we call
2032 add_cleanup, and when we leave the binding, end_stmt_group will create
2033 the TRY_FINALLY_EXPR.
2035 ??? The region level calls down there have been specifically put in place
2036 for a ZCX context and currently the order in which things are emitted
2037 (region/handlers) is different from the SJLJ case. Instead of putting
2038 other calls with different conditions at other places for the SJLJ case,
2039 it seems cleaner to reorder things for the SJLJ case and generalize the
2040 condition to make it not ZCX specific.
2042 If there are any exceptions or cleanup processing involved, we need an
2043 outer statement group (for Setjmp_Longjmp) and binding level. */
2044 if (binding_for_block)
2046 start_stmt_group ();
2050 /* If we are to call a function when exiting this block add a cleanup
2051 to the binding level we made above. */
2053 add_cleanup (build_call_0_expr (gnat_to_gnu (At_End_Proc (gnat_node))));
2055 /* If using setjmp_longjmp, make the variables for the setjmp buffer and save
2056 area for address of previous buffer. Do this first since we need to have
2057 the setjmp buf known for any decls in this block. */
2060 gnu_jmpsave_decl = create_var_decl (get_identifier ("JMPBUF_SAVE"),
2061 NULL_TREE, jmpbuf_ptr_type,
2062 build_call_0_expr (get_jmpbuf_decl),
2063 false, false, false, false, NULL,
2065 gnu_jmpbuf_decl = create_var_decl (get_identifier ("JMP_BUF"),
2066 NULL_TREE, jmpbuf_type,
2067 NULL_TREE, false, false, false, false,
2070 set_block_jmpbuf_decl (gnu_jmpbuf_decl);
2072 /* When we exit this block, restore the saved value. */
2073 add_cleanup (build_call_1_expr (set_jmpbuf_decl, gnu_jmpsave_decl));
2076 /* Now build the tree for the declarations and statements inside this block.
2077 If this is SJLJ, set our jmp_buf as the current buffer. */
2078 start_stmt_group ();
2081 add_stmt (build_call_1_expr (set_jmpbuf_decl,
2082 build_unary_op (ADDR_EXPR, NULL_TREE,
2085 if (Present (First_Real_Statement (gnat_node)))
2086 process_decls (Statements (gnat_node), Empty,
2087 First_Real_Statement (gnat_node), true, true);
2089 /* Generate code for each statement in the block. */
2090 for (gnat_temp = (Present (First_Real_Statement (gnat_node))
2091 ? First_Real_Statement (gnat_node)
2092 : First (Statements (gnat_node)));
2093 Present (gnat_temp); gnat_temp = Next (gnat_temp))
2094 add_stmt (gnat_to_gnu (gnat_temp));
2095 gnu_inner_block = end_stmt_group ();
2097 /* Now generate code for the two exception models, if either is relevant for
2101 tree *gnu_else_ptr = 0;
2104 /* Make a binding level for the exception handling declarations and code
2105 and set up gnu_except_ptr_stack for the handlers to use. */
2106 start_stmt_group ();
2109 push_stack (&gnu_except_ptr_stack, NULL_TREE,
2110 create_var_decl (get_identifier ("EXCEPT_PTR"),
2112 build_pointer_type (except_type_node),
2113 build_call_0_expr (get_excptr_decl), false,
2114 false, false, false, NULL, gnat_node));
2116 /* Generate code for each handler. The N_Exception_Handler case does the
2117 real work and returns a COND_EXPR for each handler, which we chain
2119 for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node));
2120 Present (gnat_temp); gnat_temp = Next_Non_Pragma (gnat_temp))
2122 gnu_expr = gnat_to_gnu (gnat_temp);
2124 /* If this is the first one, set it as the outer one. Otherwise,
2125 point the "else" part of the previous handler to us. Then point
2126 to our "else" part. */
2128 add_stmt (gnu_expr);
2130 *gnu_else_ptr = gnu_expr;
2132 gnu_else_ptr = &COND_EXPR_ELSE (gnu_expr);
2135 /* If none of the exception handlers did anything, re-raise but do not
2137 gnu_expr = build_call_1_expr (raise_nodefer_decl,
2138 TREE_VALUE (gnu_except_ptr_stack));
2139 annotate_with_node (gnu_expr, gnat_node);
2142 *gnu_else_ptr = gnu_expr;
2144 add_stmt (gnu_expr);
2146 /* End the binding level dedicated to the exception handlers and get the
2147 whole statement group. */
2148 pop_stack (&gnu_except_ptr_stack);
2150 gnu_handler = end_stmt_group ();
2152 /* If the setjmp returns 1, we restore our incoming longjmp value and
2153 then check the handlers. */
2154 start_stmt_group ();
2155 add_stmt_with_node (build_call_1_expr (set_jmpbuf_decl,
2158 add_stmt (gnu_handler);
2159 gnu_handler = end_stmt_group ();
2161 /* This block is now "if (setjmp) ... <handlers> else <block>". */
2162 gnu_result = build3 (COND_EXPR, void_type_node,
2165 build_unary_op (ADDR_EXPR, NULL_TREE,
2167 gnu_handler, gnu_inner_block);
2173 /* First make a block containing the handlers. */
2174 start_stmt_group ();
2175 for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node));
2176 Present (gnat_temp);
2177 gnat_temp = Next_Non_Pragma (gnat_temp))
2178 add_stmt (gnat_to_gnu (gnat_temp));
2179 gnu_handlers = end_stmt_group ();
2181 /* Now make the TRY_CATCH_EXPR for the block. */
2182 gnu_result = build2 (TRY_CATCH_EXPR, void_type_node,
2183 gnu_inner_block, gnu_handlers);
2186 gnu_result = gnu_inner_block;
2188 /* Now close our outer block, if we had to make one. */
2189 if (binding_for_block)
2191 add_stmt (gnu_result);
2193 gnu_result = end_stmt_group ();
2199 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler,
2200 to a GCC tree, which is returned. This is the variant for Setjmp_Longjmp
2201 exception handling. */
2204 Exception_Handler_to_gnu_sjlj (Node_Id gnat_node)
2206 /* Unless this is "Others" or the special "Non-Ada" exception for Ada, make
2207 an "if" statement to select the proper exceptions. For "Others", exclude
2208 exceptions where Handled_By_Others is nonzero unless the All_Others flag
2209 is set. For "Non-ada", accept an exception if "Lang" is 'V'. */
2210 tree gnu_choice = integer_zero_node;
2211 tree gnu_body = build_stmt_group (Statements (gnat_node), false);
2214 for (gnat_temp = First (Exception_Choices (gnat_node));
2215 gnat_temp; gnat_temp = Next (gnat_temp))
2219 if (Nkind (gnat_temp) == N_Others_Choice)
2221 if (All_Others (gnat_temp))
2222 this_choice = integer_one_node;
2226 (EQ_EXPR, integer_type_node,
2231 (INDIRECT_REF, NULL_TREE,
2232 TREE_VALUE (gnu_except_ptr_stack)),
2233 get_identifier ("not_handled_by_others"), NULL_TREE,
2238 else if (Nkind (gnat_temp) == N_Identifier
2239 || Nkind (gnat_temp) == N_Expanded_Name)
2241 Entity_Id gnat_ex_id = Entity (gnat_temp);
2244 /* Exception may be a renaming. Recover original exception which is
2245 the one elaborated and registered. */
2246 if (Present (Renamed_Object (gnat_ex_id)))
2247 gnat_ex_id = Renamed_Object (gnat_ex_id);
2249 gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, 0);
2253 (EQ_EXPR, integer_type_node, TREE_VALUE (gnu_except_ptr_stack),
2254 convert (TREE_TYPE (TREE_VALUE (gnu_except_ptr_stack)),
2255 build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr)));
2257 /* If this is the distinguished exception "Non_Ada_Error" (and we are
2258 in VMS mode), also allow a non-Ada exception (a VMS condition) t
2260 if (Is_Non_Ada_Error (Entity (gnat_temp)))
2263 = build_component_ref
2264 (build_unary_op (INDIRECT_REF, NULL_TREE,
2265 TREE_VALUE (gnu_except_ptr_stack)),
2266 get_identifier ("lang"), NULL_TREE, false);
2270 (TRUTH_ORIF_EXPR, integer_type_node,
2271 build_binary_op (EQ_EXPR, integer_type_node, gnu_comp,
2272 build_int_cst (TREE_TYPE (gnu_comp), 'V')),
2279 gnu_choice = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
2280 gnu_choice, this_choice);
2283 return build3 (COND_EXPR, void_type_node, gnu_choice, gnu_body, NULL_TREE);
2286 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler,
2287 to a GCC tree, which is returned. This is the variant for ZCX. */
2290 Exception_Handler_to_gnu_zcx (Node_Id gnat_node)
2292 tree gnu_etypes_list = NULL_TREE;
2295 tree gnu_current_exc_ptr;
2296 tree gnu_incoming_exc_ptr;
2299 /* We build a TREE_LIST of nodes representing what exception types this
2300 handler can catch, with special cases for others and all others cases.
2302 Each exception type is actually identified by a pointer to the exception
2303 id, or to a dummy object for "others" and "all others".
2305 Care should be taken to ensure that the control flow impact of "others"
2306 and "all others" is known to GCC. lang_eh_type_covers is doing the trick
2308 for (gnat_temp = First (Exception_Choices (gnat_node));
2309 gnat_temp; gnat_temp = Next (gnat_temp))
2311 if (Nkind (gnat_temp) == N_Others_Choice)
2314 = All_Others (gnat_temp) ? all_others_decl : others_decl;
2317 = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr);
2319 else if (Nkind (gnat_temp) == N_Identifier
2320 || Nkind (gnat_temp) == N_Expanded_Name)
2322 Entity_Id gnat_ex_id = Entity (gnat_temp);
2324 /* Exception may be a renaming. Recover original exception which is
2325 the one elaborated and registered. */
2326 if (Present (Renamed_Object (gnat_ex_id)))
2327 gnat_ex_id = Renamed_Object (gnat_ex_id);
2329 gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, 0);
2330 gnu_etype = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr);
2332 /* The Non_Ada_Error case for VMS exceptions is handled
2333 by the personality routine. */
2338 /* The GCC interface expects NULL to be passed for catch all handlers, so
2339 it would be quite tempting to set gnu_etypes_list to NULL if gnu_etype
2340 is integer_zero_node. It would not work, however, because GCC's
2341 notion of "catch all" is stronger than our notion of "others". Until
2342 we correctly use the cleanup interface as well, doing that would
2343 prevent the "all others" handlers from being seen, because nothing
2344 can be caught beyond a catch all from GCC's point of view. */
2345 gnu_etypes_list = tree_cons (NULL_TREE, gnu_etype, gnu_etypes_list);
2348 start_stmt_group ();
2351 /* Expand a call to the begin_handler hook at the beginning of the handler,
2352 and arrange for a call to the end_handler hook to occur on every possible
2355 The hooks expect a pointer to the low level occurrence. This is required
2356 for our stack management scheme because a raise inside the handler pushes
2357 a new occurrence on top of the stack, which means that this top does not
2358 necessarily match the occurrence this handler was dealing with.
2360 The EXC_PTR_EXPR object references the exception occurrence being
2361 propagated. Upon handler entry, this is the exception for which the
2362 handler is triggered. This might not be the case upon handler exit,
2363 however, as we might have a new occurrence propagated by the handler's
2364 body, and the end_handler hook called as a cleanup in this context.
2366 We use a local variable to retrieve the incoming value at handler entry
2367 time, and reuse it to feed the end_handler hook's argument at exit. */
2368 gnu_current_exc_ptr = build0 (EXC_PTR_EXPR, ptr_type_node);
2369 gnu_incoming_exc_ptr = create_var_decl (get_identifier ("EXPTR"), NULL_TREE,
2370 ptr_type_node, gnu_current_exc_ptr,
2371 false, false, false, false, NULL,
2374 add_stmt_with_node (build_call_1_expr (begin_handler_decl,
2375 gnu_incoming_exc_ptr),
2377 add_cleanup (build_call_1_expr (end_handler_decl, gnu_incoming_exc_ptr));
2378 add_stmt_list (Statements (gnat_node));
2381 return build2 (CATCH_EXPR, void_type_node, gnu_etypes_list,
2385 /* Subroutine of gnat_to_gnu to generate code for an N_Compilation unit. */
2388 Compilation_Unit_to_gnu (Node_Id gnat_node)
2390 /* Make the decl for the elaboration procedure. */
2391 bool body_p = (Defining_Entity (Unit (gnat_node)),
2392 Nkind (Unit (gnat_node)) == N_Package_Body
2393 || Nkind (Unit (gnat_node)) == N_Subprogram_Body);
2394 Entity_Id gnat_unit_entity = Defining_Entity (Unit (gnat_node));
2395 tree gnu_elab_proc_decl
2396 = create_subprog_decl
2397 (create_concat_name (gnat_unit_entity,
2398 body_p ? "elabb" : "elabs"),
2399 NULL_TREE, void_ftype, NULL_TREE, false, true, false, NULL,
2401 struct elab_info *info;
2403 push_stack (&gnu_elab_proc_stack, NULL_TREE, gnu_elab_proc_decl);
2405 DECL_ELABORATION_PROC_P (gnu_elab_proc_decl) = 1;
2406 allocate_struct_function (gnu_elab_proc_decl);
2407 Sloc_to_locus (Sloc (gnat_unit_entity), &cfun->function_end_locus);
2410 /* For a body, first process the spec if there is one. */
2411 if (Nkind (Unit (gnat_node)) == N_Package_Body
2412 || (Nkind (Unit (gnat_node)) == N_Subprogram_Body
2413 && !Acts_As_Spec (gnat_node)))
2414 add_stmt (gnat_to_gnu (Library_Unit (gnat_node)));
2416 process_inlined_subprograms (gnat_node);
2418 if (type_annotate_only)
2420 elaborate_all_entities (gnat_node);
2422 if (Nkind (Unit (gnat_node)) == N_Subprogram_Declaration
2423 || Nkind (Unit (gnat_node)) == N_Generic_Package_Declaration
2424 || Nkind (Unit (gnat_node)) == N_Generic_Subprogram_Declaration)
2428 process_decls (Declarations (Aux_Decls_Node (gnat_node)), Empty, Empty,
2430 add_stmt (gnat_to_gnu (Unit (gnat_node)));
2432 /* Process any pragmas and actions following the unit. */
2433 add_stmt_list (Pragmas_After (Aux_Decls_Node (gnat_node)));
2434 add_stmt_list (Actions (Aux_Decls_Node (gnat_node)));
2436 /* Save away what we've made so far and record this potential elaboration
2438 info = (struct elab_info *) ggc_alloc (sizeof (struct elab_info));
2439 set_current_block_context (gnu_elab_proc_decl);
2441 DECL_SAVED_TREE (gnu_elab_proc_decl) = end_stmt_group ();
2442 info->next = elab_info_list;
2443 info->elab_proc = gnu_elab_proc_decl;
2444 info->gnat_node = gnat_node;
2445 elab_info_list = info;
2447 /* Generate elaboration code for this unit, if necessary, and say whether
2449 pop_stack (&gnu_elab_proc_stack);
2451 /* Generate functions to call static constructors and destructors
2452 for targets that do not support .ctors/.dtors sections. These
2453 functions have magic names which are detected by collect2. */
2455 build_global_cdtor ('I', &static_ctors);
2458 build_global_cdtor ('D', &static_dtors);
2461 /* This function is the driver of the GNAT to GCC tree transformation
2462 process. It is the entry point of the tree transformer. GNAT_NODE is the
2463 root of some GNAT tree. Return the root of the corresponding GCC tree.
2464 If this is an expression, return the GCC equivalent of the expression. If
2465 it is a statement, return the statement. In the case when called for a
2466 statement, it may also add statements to the current statement group, in
2467 which case anything it returns is to be interpreted as occurring after
2468 anything `it already added. */
2471 gnat_to_gnu (Node_Id gnat_node)
2473 bool went_into_elab_proc = false;
2474 tree gnu_result = error_mark_node; /* Default to no value. */
2475 tree gnu_result_type = void_type_node;
2477 tree gnu_lhs, gnu_rhs;
2480 /* Save node number for error message and set location information. */
2481 error_gnat_node = gnat_node;
2482 Sloc_to_locus (Sloc (gnat_node), &input_location);
2484 if (type_annotate_only
2485 && IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call))
2486 return alloc_stmt_list ();
2488 /* If this node is a non-static subexpression and we are only
2489 annotating types, make this into a NULL_EXPR. */
2490 if (type_annotate_only
2491 && IN (Nkind (gnat_node), N_Subexpr)
2492 && Nkind (gnat_node) != N_Identifier
2493 && !Compile_Time_Known_Value (gnat_node))
2494 return build1 (NULL_EXPR, get_unpadded_type (Etype (gnat_node)),
2495 build_call_raise (CE_Range_Check_Failed));
2497 /* If this is a Statement and we are at top level, it must be part of
2498 the elaboration procedure, so mark us as being in that procedure
2499 and push our context. */
2500 if (!current_function_decl
2501 && ((IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call)
2502 && Nkind (gnat_node) != N_Null_Statement)
2503 || Nkind (gnat_node) == N_Procedure_Call_Statement
2504 || Nkind (gnat_node) == N_Label
2505 || Nkind (gnat_node) == N_Implicit_Label_Declaration
2506 || Nkind (gnat_node) == N_Handled_Sequence_Of_Statements
2507 || ((Nkind (gnat_node) == N_Raise_Constraint_Error
2508 || Nkind (gnat_node) == N_Raise_Storage_Error
2509 || Nkind (gnat_node) == N_Raise_Program_Error)
2510 && (Ekind (Etype (gnat_node)) == E_Void))))
2512 current_function_decl = TREE_VALUE (gnu_elab_proc_stack);
2513 start_stmt_group ();
2515 went_into_elab_proc = true;
2518 switch (Nkind (gnat_node))
2520 /********************************/
2521 /* Chapter 2: Lexical Elements: */
2522 /********************************/
2525 case N_Expanded_Name:
2526 case N_Operator_Symbol:
2527 case N_Defining_Identifier:
2528 gnu_result = Identifier_to_gnu (gnat_node, &gnu_result_type);
2531 case N_Integer_Literal:
2535 /* Get the type of the result, looking inside any padding and
2536 justified modular types. Then get the value in that type. */
2537 gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node));
2539 if (TREE_CODE (gnu_type) == RECORD_TYPE
2540 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2541 gnu_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
2543 gnu_result = UI_To_gnu (Intval (gnat_node), gnu_type);
2545 /* If the result overflows (meaning it doesn't fit in its base type),
2546 abort. We would like to check that the value is within the range
2547 of the subtype, but that causes problems with subtypes whose usage
2548 will raise Constraint_Error and with biased representation, so
2550 gcc_assert (!TREE_CONSTANT_OVERFLOW (gnu_result));
2554 case N_Character_Literal:
2555 /* If a Entity is present, it means that this was one of the
2556 literals in a user-defined character type. In that case,
2557 just return the value in the CONST_DECL. Otherwise, use the
2558 character code. In that case, the base type should be an
2559 INTEGER_TYPE, but we won't bother checking for that. */
2560 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2561 if (Present (Entity (gnat_node)))
2562 gnu_result = DECL_INITIAL (get_gnu_tree (Entity (gnat_node)));
2567 (gnu_result_type, UI_To_CC (Char_Literal_Value (gnat_node))),
2568 false, false, false);
2571 case N_Real_Literal:
2572 /* If this is of a fixed-point type, the value we want is the
2573 value of the corresponding integer. */
2574 if (IN (Ekind (Underlying_Type (Etype (gnat_node))), Fixed_Point_Kind))
2576 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2577 gnu_result = UI_To_gnu (Corresponding_Integer_Value (gnat_node),
2579 gcc_assert (!TREE_CONSTANT_OVERFLOW (gnu_result));
2582 /* We should never see a Vax_Float type literal, since the front end
2583 is supposed to transform these using appropriate conversions */
2584 else if (Vax_Float (Underlying_Type (Etype (gnat_node))))
2589 Ureal ur_realval = Realval (gnat_node);
2591 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2593 /* If the real value is zero, so is the result. Otherwise,
2594 convert it to a machine number if it isn't already. That
2595 forces BASE to 0 or 2 and simplifies the rest of our logic. */
2596 if (UR_Is_Zero (ur_realval))
2597 gnu_result = convert (gnu_result_type, integer_zero_node);
2600 if (!Is_Machine_Number (gnat_node))
2602 = Machine (Base_Type (Underlying_Type (Etype (gnat_node))),
2603 ur_realval, Round_Even, gnat_node);
2606 = UI_To_gnu (Numerator (ur_realval), gnu_result_type);
2608 /* If we have a base of zero, divide by the denominator.
2609 Otherwise, the base must be 2 and we scale the value, which
2610 we know can fit in the mantissa of the type (hence the use
2611 of that type above). */
2612 if (No (Rbase (ur_realval)))
2614 = build_binary_op (RDIV_EXPR,
2615 get_base_type (gnu_result_type),
2617 UI_To_gnu (Denominator (ur_realval),
2621 REAL_VALUE_TYPE tmp;
2623 gcc_assert (Rbase (ur_realval) == 2);
2624 real_ldexp (&tmp, &TREE_REAL_CST (gnu_result),
2625 - UI_To_Int (Denominator (ur_realval)));
2626 gnu_result = build_real (gnu_result_type, tmp);
2630 /* Now see if we need to negate the result. Do it this way to
2631 properly handle -0. */
2632 if (UR_Is_Negative (Realval (gnat_node)))
2634 = build_unary_op (NEGATE_EXPR, get_base_type (gnu_result_type),
2640 case N_String_Literal:
2641 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2642 if (TYPE_PRECISION (TREE_TYPE (gnu_result_type)) == HOST_BITS_PER_CHAR)
2644 String_Id gnat_string = Strval (gnat_node);
2645 int length = String_Length (gnat_string);
2646 char *string = (char *) alloca (length + 1);
2649 /* Build the string with the characters in the literal. Note
2650 that Ada strings are 1-origin. */
2651 for (i = 0; i < length; i++)
2652 string[i] = Get_String_Char (gnat_string, i + 1);
2654 /* Put a null at the end of the string in case it's in a context
2655 where GCC will want to treat it as a C string. */
2658 gnu_result = build_string (length, string);
2660 /* Strings in GCC don't normally have types, but we want
2661 this to not be converted to the array type. */
2662 TREE_TYPE (gnu_result) = gnu_result_type;
2666 /* Build a list consisting of each character, then make
2668 String_Id gnat_string = Strval (gnat_node);
2669 int length = String_Length (gnat_string);
2671 tree gnu_list = NULL_TREE;
2672 tree gnu_idx = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type));
2674 for (i = 0; i < length; i++)
2677 = tree_cons (gnu_idx,
2678 build_int_cst (TREE_TYPE (gnu_result_type),
2679 Get_String_Char (gnat_string,
2683 gnu_idx = int_const_binop (PLUS_EXPR, gnu_idx, integer_one_node,
2688 = gnat_build_constructor (gnu_result_type, nreverse (gnu_list));
2693 gnu_result = Pragma_to_gnu (gnat_node);
2696 /**************************************/
2697 /* Chapter 3: Declarations and Types: */
2698 /**************************************/
2700 case N_Subtype_Declaration:
2701 case N_Full_Type_Declaration:
2702 case N_Incomplete_Type_Declaration:
2703 case N_Private_Type_Declaration:
2704 case N_Private_Extension_Declaration:
2705 case N_Task_Type_Declaration:
2706 process_type (Defining_Entity (gnat_node));
2707 gnu_result = alloc_stmt_list ();
2710 case N_Object_Declaration:
2711 case N_Exception_Declaration:
2712 gnat_temp = Defining_Entity (gnat_node);
2713 gnu_result = alloc_stmt_list ();
2715 /* If we are just annotating types and this object has an unconstrained
2716 or task type, don't elaborate it. */
2717 if (type_annotate_only
2718 && (((Is_Array_Type (Etype (gnat_temp))
2719 || Is_Record_Type (Etype (gnat_temp)))
2720 && !Is_Constrained (Etype (gnat_temp)))
2721 || Is_Concurrent_Type (Etype (gnat_temp))))
2724 if (Present (Expression (gnat_node))
2725 && !(Nkind (gnat_node) == N_Object_Declaration
2726 && No_Initialization (gnat_node))
2727 && (!type_annotate_only
2728 || Compile_Time_Known_Value (Expression (gnat_node))))
2730 gnu_expr = gnat_to_gnu (Expression (gnat_node));
2731 if (Do_Range_Check (Expression (gnat_node)))
2732 gnu_expr = emit_range_check (gnu_expr, Etype (gnat_temp));
2734 /* If this object has its elaboration delayed, we must force
2735 evaluation of GNU_EXPR right now and save it for when the object
2737 if (Present (Freeze_Node (gnat_temp)))
2739 if ((Is_Public (gnat_temp) || global_bindings_p ())
2740 && !TREE_CONSTANT (gnu_expr))
2742 = create_var_decl (create_concat_name (gnat_temp, "init"),
2743 NULL_TREE, TREE_TYPE (gnu_expr),
2744 gnu_expr, false, Is_Public (gnat_temp),
2745 false, false, NULL, gnat_temp);
2747 gnu_expr = maybe_variable (gnu_expr);
2749 save_gnu_tree (gnat_node, gnu_expr, true);
2753 gnu_expr = NULL_TREE;
2755 if (type_annotate_only && gnu_expr && TREE_CODE (gnu_expr) == ERROR_MARK)
2756 gnu_expr = NULL_TREE;
2758 if (No (Freeze_Node (gnat_temp)))
2759 gnat_to_gnu_entity (gnat_temp, gnu_expr, 1);
2762 case N_Object_Renaming_Declaration:
2763 gnat_temp = Defining_Entity (gnat_node);
2765 /* Don't do anything if this renaming is handled by the front end or if
2766 we are just annotating types and this object has a composite or task
2767 type, don't elaborate it. We return the result in case it has any
2768 SAVE_EXPRs in it that need to be evaluated here. */
2769 if (!Is_Renaming_Of_Object (gnat_temp)
2770 && ! (type_annotate_only
2771 && (Is_Array_Type (Etype (gnat_temp))
2772 || Is_Record_Type (Etype (gnat_temp))
2773 || Is_Concurrent_Type (Etype (gnat_temp)))))
2775 = gnat_to_gnu_entity (gnat_temp,
2776 gnat_to_gnu (Renamed_Object (gnat_temp)), 1);
2778 gnu_result = alloc_stmt_list ();
2781 case N_Implicit_Label_Declaration:
2782 gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, 1);
2783 gnu_result = alloc_stmt_list ();
2786 case N_Exception_Renaming_Declaration:
2787 case N_Number_Declaration:
2788 case N_Package_Renaming_Declaration:
2789 case N_Subprogram_Renaming_Declaration:
2790 /* These are fully handled in the front end. */
2791 gnu_result = alloc_stmt_list ();
2794 /*************************************/
2795 /* Chapter 4: Names and Expressions: */
2796 /*************************************/
2798 case N_Explicit_Dereference:
2799 gnu_result = gnat_to_gnu (Prefix (gnat_node));
2800 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2801 gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result);
2804 case N_Indexed_Component:
2806 tree gnu_array_object = gnat_to_gnu (Prefix (gnat_node));
2810 Node_Id *gnat_expr_array;
2812 gnu_array_object = maybe_implicit_deref (gnu_array_object);
2813 gnu_array_object = maybe_unconstrained_array (gnu_array_object);
2815 /* If we got a padded type, remove it too. */
2816 if (TREE_CODE (TREE_TYPE (gnu_array_object)) == RECORD_TYPE
2817 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_array_object)))
2819 = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_array_object))),
2822 gnu_result = gnu_array_object;
2824 /* First compute the number of dimensions of the array, then
2825 fill the expression array, the order depending on whether
2826 this is a Convention_Fortran array or not. */
2827 for (ndim = 1, gnu_type = TREE_TYPE (gnu_array_object);
2828 TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
2829 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type));
2830 ndim++, gnu_type = TREE_TYPE (gnu_type))
2833 gnat_expr_array = (Node_Id *) alloca (ndim * sizeof (Node_Id));
2835 if (TYPE_CONVENTION_FORTRAN_P (TREE_TYPE (gnu_array_object)))
2836 for (i = ndim - 1, gnat_temp = First (Expressions (gnat_node));
2838 i--, gnat_temp = Next (gnat_temp))
2839 gnat_expr_array[i] = gnat_temp;
2841 for (i = 0, gnat_temp = First (Expressions (gnat_node));
2843 i++, gnat_temp = Next (gnat_temp))
2844 gnat_expr_array[i] = gnat_temp;
2846 for (i = 0, gnu_type = TREE_TYPE (gnu_array_object);
2847 i < ndim; i++, gnu_type = TREE_TYPE (gnu_type))
2849 gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE);
2850 gnat_temp = gnat_expr_array[i];
2851 gnu_expr = gnat_to_gnu (gnat_temp);
2853 if (Do_Range_Check (gnat_temp))
2856 (gnu_array_object, gnu_expr,
2857 TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
2858 TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
2860 gnu_result = build_binary_op (ARRAY_REF, NULL_TREE,
2861 gnu_result, gnu_expr);
2865 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2871 Node_Id gnat_range_node = Discrete_Range (gnat_node);
2873 gnu_result = gnat_to_gnu (Prefix (gnat_node));
2874 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2876 /* Do any implicit dereferences of the prefix and do any needed
2878 gnu_result = maybe_implicit_deref (gnu_result);
2879 gnu_result = maybe_unconstrained_array (gnu_result);
2880 gnu_type = TREE_TYPE (gnu_result);
2881 if (Do_Range_Check (gnat_range_node))
2883 /* Get the bounds of the slice. */
2885 = TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_result_type));
2886 tree gnu_min_expr = TYPE_MIN_VALUE (gnu_index_type);
2887 tree gnu_max_expr = TYPE_MAX_VALUE (gnu_index_type);
2888 tree gnu_expr_l, gnu_expr_h, gnu_expr_type;
2890 /* Check to see that the minimum slice value is in range */
2893 (gnu_result, gnu_min_expr,
2894 TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
2895 TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
2897 /* Check to see that the maximum slice value is in range */
2900 (gnu_result, gnu_max_expr,
2901 TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
2902 TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
2904 /* Derive a good type to convert everything too */
2905 gnu_expr_type = get_base_type (TREE_TYPE (gnu_expr_l));
2907 /* Build a compound expression that does the range checks */
2909 = build_binary_op (COMPOUND_EXPR, gnu_expr_type,
2910 convert (gnu_expr_type, gnu_expr_h),
2911 convert (gnu_expr_type, gnu_expr_l));
2913 /* Build a conditional expression that returns the range checks
2914 expression if the slice range is not null (max >= min) or
2915 returns the min if the slice range is null */
2917 = fold (build3 (COND_EXPR, gnu_expr_type,
2918 build_binary_op (GE_EXPR, gnu_expr_type,
2919 convert (gnu_expr_type,
2921 convert (gnu_expr_type,
2923 gnu_expr, gnu_min_expr));
2926 gnu_expr = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type));
2928 gnu_result = build_binary_op (ARRAY_RANGE_REF, gnu_result_type,
2929 gnu_result, gnu_expr);
2933 case N_Selected_Component:
2935 tree gnu_prefix = gnat_to_gnu (Prefix (gnat_node));
2936 Entity_Id gnat_field = Entity (Selector_Name (gnat_node));
2937 Entity_Id gnat_pref_type = Etype (Prefix (gnat_node));
2940 while (IN (Ekind (gnat_pref_type), Incomplete_Or_Private_Kind)
2941 || IN (Ekind (gnat_pref_type), Access_Kind))
2943 if (IN (Ekind (gnat_pref_type), Incomplete_Or_Private_Kind))
2944 gnat_pref_type = Underlying_Type (gnat_pref_type);
2945 else if (IN (Ekind (gnat_pref_type), Access_Kind))
2946 gnat_pref_type = Designated_Type (gnat_pref_type);
2949 gnu_prefix = maybe_implicit_deref (gnu_prefix);
2951 /* For discriminant references in tagged types always substitute the
2952 corresponding discriminant as the actual selected component. */
2954 if (Is_Tagged_Type (gnat_pref_type))
2955 while (Present (Corresponding_Discriminant (gnat_field)))
2956 gnat_field = Corresponding_Discriminant (gnat_field);
2958 /* For discriminant references of untagged types always substitute the
2959 corresponding stored discriminant. */
2961 else if (Present (Corresponding_Discriminant (gnat_field)))
2962 gnat_field = Original_Record_Component (gnat_field);
2964 /* Handle extracting the real or imaginary part of a complex.
2965 The real part is the first field and the imaginary the last. */
2967 if (TREE_CODE (TREE_TYPE (gnu_prefix)) == COMPLEX_TYPE)
2968 gnu_result = build_unary_op (Present (Next_Entity (gnat_field))
2969 ? REALPART_EXPR : IMAGPART_EXPR,
2970 NULL_TREE, gnu_prefix);
2973 gnu_field = gnat_to_gnu_field_decl (gnat_field);
2975 /* If there are discriminants, the prefix might be
2976 evaluated more than once, which is a problem if it has
2978 if (Has_Discriminants (Is_Access_Type (Etype (Prefix (gnat_node)))
2979 ? Designated_Type (Etype
2980 (Prefix (gnat_node)))
2981 : Etype (Prefix (gnat_node))))
2982 gnu_prefix = gnat_stabilize_reference (gnu_prefix, 0);
2985 = build_component_ref (gnu_prefix, NULL_TREE, gnu_field,
2986 (Nkind (Parent (gnat_node))
2987 == N_Attribute_Reference));
2990 gcc_assert (gnu_result);
2991 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2995 case N_Attribute_Reference:
2997 /* The attribute designator (like an enumeration value). */
2998 int attribute = Get_Attribute_Id (Attribute_Name (gnat_node));
3000 /* The Elab_Spec and Elab_Body attributes are special in that
3001 Prefix is a unit, not an object with a GCC equivalent. Similarly
3002 for Elaborated, since that variable isn't otherwise known. */
3003 if (attribute == Attr_Elab_Body || attribute == Attr_Elab_Spec)
3004 return (create_subprog_decl
3005 (create_concat_name (Entity (Prefix (gnat_node)),
3006 attribute == Attr_Elab_Body
3007 ? "elabb" : "elabs"),
3008 NULL_TREE, void_ftype, NULL_TREE, false, true, true, NULL,
3011 gnu_result = Attribute_to_gnu (gnat_node, &gnu_result_type, attribute);
3016 /* Like 'Access as far as we are concerned. */
3017 gnu_result = gnat_to_gnu (Prefix (gnat_node));
3018 gnu_result = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_result);
3019 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3023 case N_Extension_Aggregate:
3027 /* ??? It is wrong to evaluate the type now, but there doesn't
3028 seem to be any other practical way of doing it. */
3030 gcc_assert (!Expansion_Delayed (gnat_node));
3032 gnu_aggr_type = gnu_result_type
3033 = get_unpadded_type (Etype (gnat_node));
3035 if (TREE_CODE (gnu_result_type) == RECORD_TYPE
3036 && TYPE_CONTAINS_TEMPLATE_P (gnu_result_type))
3038 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_result_type)));
3040 if (Null_Record_Present (gnat_node))
3041 gnu_result = gnat_build_constructor (gnu_aggr_type, NULL_TREE);
3043 else if (TREE_CODE (gnu_aggr_type) == UNION_TYPE
3044 && TYPE_UNCHECKED_UNION_P (gnu_aggr_type))
3046 /* The first element is the discrimant, which we ignore. The
3047 next is the field we're building. Convert the expression
3048 to the type of the field and then to the union type. */
3050 = Next (First (Component_Associations (gnat_node)));
3051 Entity_Id gnat_field = Entity (First (Choices (gnat_assoc)));
3053 = TREE_TYPE (gnat_to_gnu_entity (gnat_field, NULL_TREE, 0));
3055 gnu_result = convert (gnu_field_type,
3056 gnat_to_gnu (Expression (gnat_assoc)));
3058 else if (TREE_CODE (gnu_aggr_type) == RECORD_TYPE
3059 || TREE_CODE (gnu_aggr_type) == UNION_TYPE)
3061 = assoc_to_constructor (First (Component_Associations (gnat_node)),
3063 else if (TREE_CODE (gnu_aggr_type) == ARRAY_TYPE)
3064 gnu_result = pos_to_constructor (First (Expressions (gnat_node)),
3066 Component_Type (Etype (gnat_node)));
3067 else if (TREE_CODE (gnu_aggr_type) == COMPLEX_TYPE)
3070 (COMPLEX_EXPR, gnu_aggr_type,
3071 gnat_to_gnu (Expression (First
3072 (Component_Associations (gnat_node)))),
3073 gnat_to_gnu (Expression
3075 (First (Component_Associations (gnat_node))))));
3079 gnu_result = convert (gnu_result_type, gnu_result);
3084 gnu_result = null_pointer_node;
3085 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3088 case N_Type_Conversion:
3089 case N_Qualified_Expression:
3090 /* Get the operand expression. */
3091 gnu_result = gnat_to_gnu (Expression (gnat_node));
3092 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3095 = convert_with_check (Etype (gnat_node), gnu_result,
3096 Do_Overflow_Check (gnat_node),
3097 Do_Range_Check (Expression (gnat_node)),
3098 Nkind (gnat_node) == N_Type_Conversion
3099 && Float_Truncate (gnat_node));
3102 case N_Unchecked_Type_Conversion:
3103 gnu_result = gnat_to_gnu (Expression (gnat_node));
3104 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3106 /* If the result is a pointer type, see if we are improperly
3107 converting to a stricter alignment. */
3109 if (STRICT_ALIGNMENT && POINTER_TYPE_P (gnu_result_type)
3110 && IN (Ekind (Etype (gnat_node)), Access_Kind))
3112 unsigned int align = known_alignment (gnu_result);
3113 tree gnu_obj_type = TREE_TYPE (gnu_result_type);
3114 unsigned int oalign = TYPE_ALIGN (gnu_obj_type);
3116 if (align != 0 && align < oalign && !TYPE_ALIGN_OK (gnu_obj_type))
3117 post_error_ne_tree_2
3118 ("?source alignment (^) '< alignment of & (^)",
3119 gnat_node, Designated_Type (Etype (gnat_node)),
3120 size_int (align / BITS_PER_UNIT), oalign / BITS_PER_UNIT);
3123 gnu_result = unchecked_convert (gnu_result_type, gnu_result,
3124 No_Truncation (gnat_node));
3130 tree gnu_object = gnat_to_gnu (Left_Opnd (gnat_node));
3131 Node_Id gnat_range = Right_Opnd (gnat_node);
3135 /* GNAT_RANGE is either an N_Range node or an identifier
3136 denoting a subtype. */
3137 if (Nkind (gnat_range) == N_Range)
3139 gnu_low = gnat_to_gnu (Low_Bound (gnat_range));
3140 gnu_high = gnat_to_gnu (High_Bound (gnat_range));
3142 else if (Nkind (gnat_range) == N_Identifier
3143 || Nkind (gnat_range) == N_Expanded_Name)
3145 tree gnu_range_type = get_unpadded_type (Entity (gnat_range));
3147 gnu_low = TYPE_MIN_VALUE (gnu_range_type);
3148 gnu_high = TYPE_MAX_VALUE (gnu_range_type);
3153 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3155 /* If LOW and HIGH are identical, perform an equality test.
3156 Otherwise, ensure that GNU_OBJECT is only evaluated once
3157 and perform a full range test. */
3158 if (operand_equal_p (gnu_low, gnu_high, 0))
3159 gnu_result = build_binary_op (EQ_EXPR, gnu_result_type,
3160 gnu_object, gnu_low);
3163 gnu_object = protect_multiple_eval (gnu_object);
3165 = build_binary_op (TRUTH_ANDIF_EXPR, gnu_result_type,
3166 build_binary_op (GE_EXPR, gnu_result_type,
3167 gnu_object, gnu_low),
3168 build_binary_op (LE_EXPR, gnu_result_type,
3169 gnu_object, gnu_high));
3172 if (Nkind (gnat_node) == N_Not_In)
3173 gnu_result = invert_truthvalue (gnu_result);
3178 gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
3179 gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
3180 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3181 gnu_result = build_binary_op (FLOAT_TYPE_P (gnu_result_type)
3183 : (Rounded_Result (gnat_node)
3184 ? ROUND_DIV_EXPR : TRUNC_DIV_EXPR),
3185 gnu_result_type, gnu_lhs, gnu_rhs);
3188 case N_Op_Or: case N_Op_And: case N_Op_Xor:
3189 /* These can either be operations on booleans or on modular types.
3190 Fall through for boolean types since that's the way GNU_CODES is
3192 if (IN (Ekind (Underlying_Type (Etype (gnat_node))),
3193 Modular_Integer_Kind))
3196 = (Nkind (gnat_node) == N_Op_Or ? BIT_IOR_EXPR
3197 : Nkind (gnat_node) == N_Op_And ? BIT_AND_EXPR
3200 gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
3201 gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
3202 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3203 gnu_result = build_binary_op (code, gnu_result_type,
3208 /* ... fall through ... */
3210 case N_Op_Eq: case N_Op_Ne: case N_Op_Lt:
3211 case N_Op_Le: case N_Op_Gt: case N_Op_Ge:
3212 case N_Op_Add: case N_Op_Subtract: case N_Op_Multiply:
3213 case N_Op_Mod: case N_Op_Rem:
3214 case N_Op_Rotate_Left:
3215 case N_Op_Rotate_Right:
3216 case N_Op_Shift_Left:
3217 case N_Op_Shift_Right:
3218 case N_Op_Shift_Right_Arithmetic:
3219 case N_And_Then: case N_Or_Else:
3221 enum tree_code code = gnu_codes[Nkind (gnat_node)];
3224 gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
3225 gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
3226 gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node));
3228 /* If this is a comparison operator, convert any references to
3229 an unconstrained array value into a reference to the
3231 if (TREE_CODE_CLASS (code) == tcc_comparison)
3233 gnu_lhs = maybe_unconstrained_array (gnu_lhs);
3234 gnu_rhs = maybe_unconstrained_array (gnu_rhs);
3237 /* If the result type is a private type, its full view may be a
3238 numeric subtype. The representation we need is that of its base
3239 type, given that it is the result of an arithmetic operation. */
3240 else if (Is_Private_Type (Etype (gnat_node)))
3241 gnu_type = gnu_result_type
3242 = get_unpadded_type (Base_Type (Full_View (Etype (gnat_node))));
3244 /* If this is a shift whose count is not guaranteed to be correct,
3245 we need to adjust the shift count. */
3246 if (IN (Nkind (gnat_node), N_Op_Shift)
3247 && !Shift_Count_OK (gnat_node))
3249 tree gnu_count_type = get_base_type (TREE_TYPE (gnu_rhs));
3251 = convert (gnu_count_type, TYPE_SIZE (gnu_type));
3253 if (Nkind (gnat_node) == N_Op_Rotate_Left
3254 || Nkind (gnat_node) == N_Op_Rotate_Right)
3255 gnu_rhs = build_binary_op (TRUNC_MOD_EXPR, gnu_count_type,
3256 gnu_rhs, gnu_max_shift);
3257 else if (Nkind (gnat_node) == N_Op_Shift_Right_Arithmetic)
3260 (MIN_EXPR, gnu_count_type,
3261 build_binary_op (MINUS_EXPR,
3264 convert (gnu_count_type,
3269 /* For right shifts, the type says what kind of shift to do,
3270 so we may need to choose a different type. */
3271 if (Nkind (gnat_node) == N_Op_Shift_Right
3272 && !TYPE_UNSIGNED (gnu_type))
3273 gnu_type = gnat_unsigned_type (gnu_type);
3274 else if (Nkind (gnat_node) == N_Op_Shift_Right_Arithmetic
3275 && TYPE_UNSIGNED (gnu_type))
3276 gnu_type = gnat_signed_type (gnu_type);
3278 if (gnu_type != gnu_result_type)
3280 gnu_lhs = convert (gnu_type, gnu_lhs);
3281 gnu_rhs = convert (gnu_type, gnu_rhs);
3284 gnu_result = build_binary_op (code, gnu_type, gnu_lhs, gnu_rhs);
3286 /* If this is a logical shift with the shift count not verified,
3287 we must return zero if it is too large. We cannot compensate
3288 above in this case. */
3289 if ((Nkind (gnat_node) == N_Op_Shift_Left
3290 || Nkind (gnat_node) == N_Op_Shift_Right)
3291 && !Shift_Count_OK (gnat_node))
3295 build_binary_op (GE_EXPR, integer_type_node,
3297 convert (TREE_TYPE (gnu_rhs),
3298 TYPE_SIZE (gnu_type))),
3299 convert (gnu_type, integer_zero_node),
3304 case N_Conditional_Expression:
3306 tree gnu_cond = gnat_to_gnu (First (Expressions (gnat_node)));
3307 tree gnu_true = gnat_to_gnu (Next (First (Expressions (gnat_node))));
3309 = gnat_to_gnu (Next (Next (First (Expressions (gnat_node)))));
3311 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3312 gnu_result = build_cond_expr (gnu_result_type,
3313 gnat_truthvalue_conversion (gnu_cond),
3314 gnu_true, gnu_false);
3319 gnu_result = gnat_to_gnu (Right_Opnd (gnat_node));
3320 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3324 /* This case can apply to a boolean or a modular type.
3325 Fall through for a boolean operand since GNU_CODES is set
3326 up to handle this. */
3327 if (IN (Ekind (Etype (gnat_node)), Modular_Integer_Kind))
3329 gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node));
3330 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3331 gnu_result = build_unary_op (BIT_NOT_EXPR, gnu_result_type,
3336 /* ... fall through ... */
3338 case N_Op_Minus: case N_Op_Abs:
3339 gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node));
3341 if (Ekind (Etype (gnat_node)) != E_Private_Type)
3342 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3344 gnu_result_type = get_unpadded_type (Base_Type
3345 (Full_View (Etype (gnat_node))));
3347 gnu_result = build_unary_op (gnu_codes[Nkind (gnat_node)],
3348 gnu_result_type, gnu_expr);
3355 bool ignore_init_type = false;
3357 gnat_temp = Expression (gnat_node);
3359 /* The Expression operand can either be an N_Identifier or
3360 Expanded_Name, which must represent a type, or a
3361 N_Qualified_Expression, which contains both the object type and an
3362 initial value for the object. */
3363 if (Nkind (gnat_temp) == N_Identifier
3364 || Nkind (gnat_temp) == N_Expanded_Name)
3365 gnu_type = gnat_to_gnu_type (Entity (gnat_temp));
3366 else if (Nkind (gnat_temp) == N_Qualified_Expression)
3368 Entity_Id gnat_desig_type
3369 = Designated_Type (Underlying_Type (Etype (gnat_node)));
3371 ignore_init_type = Has_Constrained_Partial_View (gnat_desig_type);
3372 gnu_init = gnat_to_gnu (Expression (gnat_temp));
3374 gnu_init = maybe_unconstrained_array (gnu_init);
3375 if (Do_Range_Check (Expression (gnat_temp)))
3376 gnu_init = emit_range_check (gnu_init, gnat_desig_type);
3378 if (Is_Elementary_Type (gnat_desig_type)
3379 || Is_Constrained (gnat_desig_type))
3381 gnu_type = gnat_to_gnu_type (gnat_desig_type);
3382 gnu_init = convert (gnu_type, gnu_init);
3386 gnu_type = gnat_to_gnu_type (Etype (Expression (gnat_temp)));
3387 if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
3388 gnu_type = TREE_TYPE (gnu_init);
3390 gnu_init = convert (gnu_type, gnu_init);
3396 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3397 return build_allocator (gnu_type, gnu_init, gnu_result_type,
3398 Procedure_To_Call (gnat_node),
3399 Storage_Pool (gnat_node), gnat_node,
3404 /***************************/
3405 /* Chapter 5: Statements: */
3406 /***************************/
3409 gnu_result = build1 (LABEL_EXPR, void_type_node,
3410 gnat_to_gnu (Identifier (gnat_node)));
3413 case N_Null_Statement:
3414 gnu_result = alloc_stmt_list ();
3417 case N_Assignment_Statement:
3418 /* Get the LHS and RHS of the statement and convert any reference to an
3419 unconstrained array into a reference to the underlying array.
3420 If we are not to do range checking and the RHS is an N_Function_Call,
3421 pass the LHS to the call function. */
3422 gnu_lhs = maybe_unconstrained_array (gnat_to_gnu (Name (gnat_node)));
3424 /* If the type has a size that overflows, convert this into raise of
3425 Storage_Error: execution shouldn't have gotten here anyway. */
3426 if (TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (gnu_lhs))) == INTEGER_CST
3427 && TREE_OVERFLOW (TYPE_SIZE_UNIT (TREE_TYPE (gnu_lhs))))
3428 gnu_result = build_call_raise (SE_Object_Too_Large);
3429 else if (Nkind (Expression (gnat_node)) == N_Function_Call
3430 && !Do_Range_Check (Expression (gnat_node)))
3431 gnu_result = call_to_gnu (Expression (gnat_node),
3432 &gnu_result_type, gnu_lhs);
3436 = maybe_unconstrained_array (gnat_to_gnu (Expression (gnat_node)));
3438 /* If range check is needed, emit code to generate it */
3439 if (Do_Range_Check (Expression (gnat_node)))
3440 gnu_rhs = emit_range_check (gnu_rhs, Etype (Name (gnat_node)));
3443 = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_lhs, gnu_rhs);
3447 case N_If_Statement:
3449 tree *gnu_else_ptr; /* Point to put next "else if" or "else". */
3451 /* Make the outer COND_EXPR. Avoid non-determinism. */
3452 gnu_result = build3 (COND_EXPR, void_type_node,
3453 gnat_to_gnu (Condition (gnat_node)),
3454 NULL_TREE, NULL_TREE);
3455 COND_EXPR_THEN (gnu_result)
3456 = build_stmt_group (Then_Statements (gnat_node), false);
3457 TREE_SIDE_EFFECTS (gnu_result) = 1;
3458 gnu_else_ptr = &COND_EXPR_ELSE (gnu_result);
3460 /* Now make a COND_EXPR for each of the "else if" parts. Put each
3461 into the previous "else" part and point to where to put any
3462 outer "else". Also avoid non-determinism. */
3463 if (Present (Elsif_Parts (gnat_node)))
3464 for (gnat_temp = First (Elsif_Parts (gnat_node));
3465 Present (gnat_temp); gnat_temp = Next (gnat_temp))
3467 gnu_expr = build3 (COND_EXPR, void_type_node,
3468 gnat_to_gnu (Condition (gnat_temp)),
3469 NULL_TREE, NULL_TREE);
3470 COND_EXPR_THEN (gnu_expr)
3471 = build_stmt_group (Then_Statements (gnat_temp), false);
3472 TREE_SIDE_EFFECTS (gnu_expr) = 1;
3473 annotate_with_node (gnu_expr, gnat_temp);
3474 *gnu_else_ptr = gnu_expr;
3475 gnu_else_ptr = &COND_EXPR_ELSE (gnu_expr);
3478 *gnu_else_ptr = build_stmt_group (Else_Statements (gnat_node), false);
3482 case N_Case_Statement:
3483 gnu_result = Case_Statement_to_gnu (gnat_node);
3486 case N_Loop_Statement:
3487 gnu_result = Loop_Statement_to_gnu (gnat_node);
3490 case N_Block_Statement:
3491 start_stmt_group ();
3493 process_decls (Declarations (gnat_node), Empty, Empty, true, true);
3494 add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node)));
3496 gnu_result = end_stmt_group ();
3498 if (Present (Identifier (gnat_node)))
3499 mark_out_of_scope (Entity (Identifier (gnat_node)));
3502 case N_Exit_Statement:
3504 = build2 (EXIT_STMT, void_type_node,
3505 (Present (Condition (gnat_node))
3506 ? gnat_to_gnu (Condition (gnat_node)) : NULL_TREE),
3507 (Present (Name (gnat_node))
3508 ? get_gnu_tree (Entity (Name (gnat_node)))
3509 : TREE_VALUE (gnu_loop_label_stack)));
3512 case N_Return_Statement:
3514 /* The gnu function type of the subprogram currently processed. */
3515 tree gnu_subprog_type = TREE_TYPE (current_function_decl);
3516 /* The return value from the subprogram. */
3517 tree gnu_ret_val = NULL_TREE;
3518 /* The place to put the return value. */
3521 /* If we are dealing with a "return;" from an Ada procedure with
3522 parameters passed by copy in copy out, we need to return a record
3523 containing the final values of these parameters. If the list
3524 contains only one entry, return just that entry.
3526 For a full description of the copy in copy out parameter mechanism,
3527 see the part of the gnat_to_gnu_entity routine dealing with the
3528 translation of subprograms.
3530 But if we have a return label defined, convert this into
3531 a branch to that label. */
3533 if (TREE_VALUE (gnu_return_label_stack))
3535 gnu_result = build1 (GOTO_EXPR, void_type_node,
3536 TREE_VALUE (gnu_return_label_stack));
3540 else if (TYPE_CI_CO_LIST (gnu_subprog_type))
3542 gnu_lhs = DECL_RESULT (current_function_decl);
3543 if (list_length (TYPE_CI_CO_LIST (gnu_subprog_type)) == 1)
3544 gnu_ret_val = TREE_VALUE (TYPE_CI_CO_LIST (gnu_subprog_type));
3547 = gnat_build_constructor (TREE_TYPE (gnu_subprog_type),
3548 TYPE_CI_CO_LIST (gnu_subprog_type));
3551 /* If the Ada subprogram is a function, we just need to return the
3552 expression. If the subprogram returns an unconstrained
3553 array, we have to allocate a new version of the result and
3554 return it. If we return by reference, return a pointer. */
3556 else if (Present (Expression (gnat_node)))
3558 /* If the current function returns by target pointer and we
3559 are doing a call, pass that target to the call. */
3560 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type)
3561 && Nkind (Expression (gnat_node)) == N_Function_Call)
3564 = build_unary_op (INDIRECT_REF, NULL_TREE,
3565 DECL_ARGUMENTS (current_function_decl));
3566 gnu_result = call_to_gnu (Expression (gnat_node),
3567 &gnu_result_type, gnu_lhs);
3571 gnu_ret_val = gnat_to_gnu (Expression (gnat_node));
3573 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
3574 /* The original return type was unconstrained so dereference
3575 the TARGET pointer in the actual return value's type. */
3577 = build_unary_op (INDIRECT_REF, TREE_TYPE (gnu_ret_val),
3578 DECL_ARGUMENTS (current_function_decl));
3580 gnu_lhs = DECL_RESULT (current_function_decl);
3582 /* Do not remove the padding from GNU_RET_VAL if the inner
3583 type is self-referential since we want to allocate the fixed
3584 size in that case. */
3585 if (TREE_CODE (gnu_ret_val) == COMPONENT_REF
3586 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0)))
3588 && (TYPE_IS_PADDING_P
3589 (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0))))
3590 && (CONTAINS_PLACEHOLDER_P
3591 (TYPE_SIZE (TREE_TYPE (gnu_ret_val)))))
3592 gnu_ret_val = TREE_OPERAND (gnu_ret_val, 0);
3594 if (TYPE_RETURNS_BY_REF_P (gnu_subprog_type)
3595 || By_Ref (gnat_node))
3597 = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_ret_val);
3599 else if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type))
3601 gnu_ret_val = maybe_unconstrained_array (gnu_ret_val);
3603 /* We have two cases: either the function returns with
3604 depressed stack or not. If not, we allocate on the
3605 secondary stack. If so, we allocate in the stack frame.
3606 if no copy is needed, the front end will set By_Ref,
3607 which we handle in the case above. */
3608 if (TYPE_RETURNS_STACK_DEPRESSED (gnu_subprog_type))
3610 = build_allocator (TREE_TYPE (gnu_ret_val),
3612 TREE_TYPE (gnu_subprog_type),
3613 0, -1, gnat_node, false);
3616 = build_allocator (TREE_TYPE (gnu_ret_val),
3618 TREE_TYPE (gnu_subprog_type),
3619 Procedure_To_Call (gnat_node),
3620 Storage_Pool (gnat_node),
3626 /* If the Ada subprogram is a regular procedure, just return. */
3627 gnu_lhs = NULL_TREE;
3629 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
3632 gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE,
3633 gnu_lhs, gnu_ret_val);
3634 add_stmt_with_node (gnu_result, gnat_node);
3635 gnu_lhs = NULL_TREE;
3638 gnu_result = build_return_expr (gnu_lhs, gnu_ret_val);
3642 case N_Goto_Statement:
3643 gnu_result = build1 (GOTO_EXPR, void_type_node,
3644 gnat_to_gnu (Name (gnat_node)));
3647 /****************************/
3648 /* Chapter 6: Subprograms: */
3649 /****************************/
3651 case N_Subprogram_Declaration:
3652 /* Unless there is a freeze node, declare the subprogram. We consider
3653 this a "definition" even though we're not generating code for
3654 the subprogram because we will be making the corresponding GCC
3657 if (No (Freeze_Node (Defining_Entity (Specification (gnat_node)))))
3658 gnat_to_gnu_entity (Defining_Entity (Specification (gnat_node)),
3660 gnu_result = alloc_stmt_list ();
3663 case N_Abstract_Subprogram_Declaration:
3664 /* This subprogram doesn't exist for code generation purposes, but we
3665 have to elaborate the types of any parameters, unless they are
3666 imported types (nothing to generate in this case). */
3668 = First_Formal (Defining_Entity (Specification (gnat_node)));
3669 Present (gnat_temp);
3670 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3671 if (Is_Itype (Etype (gnat_temp))
3672 && !From_With_Type (Etype (gnat_temp)))
3673 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3675 gnu_result = alloc_stmt_list ();
3678 case N_Defining_Program_Unit_Name:
3679 /* For a child unit identifier go up a level to get the
3680 specification. We get this when we try to find the spec of
3681 a child unit package that is the compilation unit being compiled. */
3682 gnu_result = gnat_to_gnu (Parent (gnat_node));
3685 case N_Subprogram_Body:
3686 Subprogram_Body_to_gnu (gnat_node);
3687 gnu_result = alloc_stmt_list ();
3690 case N_Function_Call:
3691 case N_Procedure_Call_Statement:
3692 gnu_result = call_to_gnu (gnat_node, &gnu_result_type, NULL_TREE);
3695 /*************************/
3696 /* Chapter 7: Packages: */
3697 /*************************/
3699 case N_Package_Declaration:
3700 gnu_result = gnat_to_gnu (Specification (gnat_node));
3703 case N_Package_Specification:
3705 start_stmt_group ();
3706 process_decls (Visible_Declarations (gnat_node),
3707 Private_Declarations (gnat_node), Empty, true, true);
3708 gnu_result = end_stmt_group ();
3711 case N_Package_Body:
3713 /* If this is the body of a generic package - do nothing */
3714 if (Ekind (Corresponding_Spec (gnat_node)) == E_Generic_Package)
3716 gnu_result = alloc_stmt_list ();
3720 start_stmt_group ();
3721 process_decls (Declarations (gnat_node), Empty, Empty, true, true);
3723 if (Present (Handled_Statement_Sequence (gnat_node)))
3724 add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node)));
3726 gnu_result = end_stmt_group ();
3729 /*********************************/
3730 /* Chapter 8: Visibility Rules: */
3731 /*********************************/
3733 case N_Use_Package_Clause:
3734 case N_Use_Type_Clause:
3735 /* Nothing to do here - but these may appear in list of declarations */
3736 gnu_result = alloc_stmt_list ();
3739 /***********************/
3740 /* Chapter 9: Tasks: */
3741 /***********************/
3743 case N_Protected_Type_Declaration:
3744 gnu_result = alloc_stmt_list ();
3747 case N_Single_Task_Declaration:
3748 gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, 1);
3749 gnu_result = alloc_stmt_list ();
3752 /***********************************************************/
3753 /* Chapter 10: Program Structure and Compilation Issues: */
3754 /***********************************************************/
3756 case N_Compilation_Unit:
3758 /* This is not called for the main unit, which is handled in function
3760 start_stmt_group ();
3763 Compilation_Unit_to_gnu (gnat_node);
3764 gnu_result = alloc_stmt_list ();
3767 case N_Subprogram_Body_Stub:
3768 case N_Package_Body_Stub:
3769 case N_Protected_Body_Stub:
3770 case N_Task_Body_Stub:
3771 /* Simply process whatever unit is being inserted. */
3772 gnu_result = gnat_to_gnu (Unit (Library_Unit (gnat_node)));
3776 gnu_result = gnat_to_gnu (Proper_Body (gnat_node));
3779 /***************************/
3780 /* Chapter 11: Exceptions: */
3781 /***************************/
3783 case N_Handled_Sequence_Of_Statements:
3784 /* If there is an At_End procedure attached to this node, and the EH
3785 mechanism is SJLJ, we must have at least a corresponding At_End
3786 handler, unless the No_Exception_Handlers restriction is set. */
3787 gcc_assert (type_annotate_only
3788 || Exception_Mechanism != Setjmp_Longjmp
3789 || No (At_End_Proc (gnat_node))
3790 || Present (Exception_Handlers (gnat_node))
3791 || No_Exception_Handlers_Set ());
3793 gnu_result = Handled_Sequence_Of_Statements_to_gnu (gnat_node);
3796 case N_Exception_Handler:
3797 if (Exception_Mechanism == Setjmp_Longjmp)
3798 gnu_result = Exception_Handler_to_gnu_sjlj (gnat_node);
3799 else if (Exception_Mechanism == Back_End_Exceptions)
3800 gnu_result = Exception_Handler_to_gnu_zcx (gnat_node);
3806 /*******************************/
3807 /* Chapter 12: Generic Units: */
3808 /*******************************/
3810 case N_Generic_Function_Renaming_Declaration:
3811 case N_Generic_Package_Renaming_Declaration:
3812 case N_Generic_Procedure_Renaming_Declaration:
3813 case N_Generic_Package_Declaration:
3814 case N_Generic_Subprogram_Declaration:
3815 case N_Package_Instantiation:
3816 case N_Procedure_Instantiation:
3817 case N_Function_Instantiation:
3818 /* These nodes can appear on a declaration list but there is nothing to
3819 to be done with them. */
3820 gnu_result = alloc_stmt_list ();
3823 /***************************************************/
3824 /* Chapter 13: Representation Clauses and */
3825 /* Implementation-Dependent Features: */
3826 /***************************************************/
3828 case N_Attribute_Definition_Clause:
3830 gnu_result = alloc_stmt_list ();
3832 /* The only one we need deal with is for 'Address. For the others, SEM
3833 puts the information elsewhere. We need only deal with 'Address
3834 if the object has a Freeze_Node (which it never will currently). */
3835 if (Get_Attribute_Id (Chars (gnat_node)) != Attr_Address
3836 || No (Freeze_Node (Entity (Name (gnat_node)))))
3839 /* Get the value to use as the address and save it as the
3840 equivalent for GNAT_TEMP. When the object is frozen,
3841 gnat_to_gnu_entity will do the right thing. */
3842 save_gnu_tree (Entity (Name (gnat_node)),
3843 gnat_to_gnu (Expression (gnat_node)), true);
3846 case N_Enumeration_Representation_Clause:
3847 case N_Record_Representation_Clause:
3849 /* We do nothing with these. SEM puts the information elsewhere. */
3850 gnu_result = alloc_stmt_list ();
3853 case N_Code_Statement:
3854 if (!type_annotate_only)
3856 tree gnu_template = gnat_to_gnu (Asm_Template (gnat_node));
3857 tree gnu_input_list = NULL_TREE, gnu_output_list = NULL_TREE;
3858 tree gnu_clobber_list = NULL_TREE;
3861 /* First process inputs, then outputs, then clobbers. */
3862 Setup_Asm_Inputs (gnat_node);
3863 while (Present (gnat_temp = Asm_Input_Value ()))
3865 tree gnu_value = gnat_to_gnu (gnat_temp);
3866 tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu
3867 (Asm_Input_Constraint ()));
3870 = tree_cons (gnu_constr, gnu_value, gnu_input_list);
3874 Setup_Asm_Outputs (gnat_node);
3875 while (Present (gnat_temp = Asm_Output_Variable ()))
3877 tree gnu_value = gnat_to_gnu (gnat_temp);
3878 tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu
3879 (Asm_Output_Constraint ()));
3882 = tree_cons (gnu_constr, gnu_value, gnu_output_list);
3886 Clobber_Setup (gnat_node);
3887 while ((clobber = Clobber_Get_Next ()))
3889 = tree_cons (NULL_TREE,
3890 build_string (strlen (clobber) + 1, clobber),
3893 gnu_input_list = nreverse (gnu_input_list);
3894 gnu_output_list = nreverse (gnu_output_list);
3895 gnu_result = build4 (ASM_EXPR, void_type_node,
3896 gnu_template, gnu_output_list,
3897 gnu_input_list, gnu_clobber_list);
3898 ASM_VOLATILE_P (gnu_result) = Is_Asm_Volatile (gnat_node);
3901 gnu_result = alloc_stmt_list ();
3905 /***************************************************/
3907 /***************************************************/
3909 case N_Freeze_Entity:
3910 start_stmt_group ();
3911 process_freeze_entity (gnat_node);
3912 process_decls (Actions (gnat_node), Empty, Empty, true, true);
3913 gnu_result = end_stmt_group ();
3916 case N_Itype_Reference:
3917 if (!present_gnu_tree (Itype (gnat_node)))
3918 process_type (Itype (gnat_node));
3920 gnu_result = alloc_stmt_list ();
3923 case N_Free_Statement:
3924 if (!type_annotate_only)
3926 tree gnu_ptr = gnat_to_gnu (Expression (gnat_node));
3931 /* If this is a thin pointer, we must dereference it to create
3932 a fat pointer, then go back below to a thin pointer. The
3933 reason for this is that we need a fat pointer someplace in
3934 order to properly compute the size. */
3935 if (TYPE_THIN_POINTER_P (TREE_TYPE (gnu_ptr)))
3936 gnu_ptr = build_unary_op (ADDR_EXPR, NULL_TREE,
3937 build_unary_op (INDIRECT_REF, NULL_TREE,
3940 /* If this is an unconstrained array, we know the object must
3941 have been allocated with the template in front of the object.
3942 So pass the template address, but get the total size. Do this
3943 by converting to a thin pointer. */
3944 if (TYPE_FAT_POINTER_P (TREE_TYPE (gnu_ptr)))
3946 = convert (build_pointer_type
3947 (TYPE_OBJECT_RECORD_TYPE
3948 (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr)))),
3951 gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr));
3952 gnu_obj_size = TYPE_SIZE_UNIT (gnu_obj_type);
3953 align = TYPE_ALIGN (gnu_obj_type);
3955 if (TREE_CODE (gnu_obj_type) == RECORD_TYPE
3956 && TYPE_CONTAINS_TEMPLATE_P (gnu_obj_type))
3958 tree gnu_char_ptr_type = build_pointer_type (char_type_node);
3959 tree gnu_pos = byte_position (TYPE_FIELDS (gnu_obj_type));
3960 tree gnu_byte_offset
3961 = convert (gnu_char_ptr_type,
3962 size_diffop (size_zero_node, gnu_pos));
3964 gnu_ptr = convert (gnu_char_ptr_type, gnu_ptr);
3965 gnu_ptr = build_binary_op (MINUS_EXPR, gnu_char_ptr_type,
3966 gnu_ptr, gnu_byte_offset);
3969 gnu_result = build_call_alloc_dealloc (gnu_ptr, gnu_obj_size, align,
3970 Procedure_To_Call (gnat_node),
3971 Storage_Pool (gnat_node),
3976 case N_Raise_Constraint_Error:
3977 case N_Raise_Program_Error:
3978 case N_Raise_Storage_Error:
3979 if (type_annotate_only)
3981 gnu_result = alloc_stmt_list ();
3985 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3986 gnu_result = build_call_raise (UI_To_Int (Reason (gnat_node)));
3988 /* If the type is VOID, this is a statement, so we need to
3989 generate the code for the call. Handle a Condition, if there
3991 if (TREE_CODE (gnu_result_type) == VOID_TYPE)
3993 annotate_with_node (gnu_result, gnat_node);
3995 if (Present (Condition (gnat_node)))
3996 gnu_result = build3 (COND_EXPR, void_type_node,
3997 gnat_to_gnu (Condition (gnat_node)),
3998 gnu_result, alloc_stmt_list ());
4001 gnu_result = build1 (NULL_EXPR, gnu_result_type, gnu_result);
4004 case N_Validate_Unchecked_Conversion:
4005 /* If the result is a pointer type, see if we are either converting
4006 from a non-pointer or from a pointer to a type with a different
4007 alias set and warn if so. If the result defined in the same unit as
4008 this unchecked conversion, we can allow this because we can know to
4009 make that type have alias set 0. */
4011 tree gnu_source_type = gnat_to_gnu_type (Source_Type (gnat_node));
4012 tree gnu_target_type = gnat_to_gnu_type (Target_Type (gnat_node));
4014 if (POINTER_TYPE_P (gnu_target_type)
4015 && !In_Same_Source_Unit (Target_Type (gnat_node), gnat_node)
4016 && get_alias_set (TREE_TYPE (gnu_target_type)) != 0
4017 && !No_Strict_Aliasing (Underlying_Type (Target_Type (gnat_node)))
4018 && (!POINTER_TYPE_P (gnu_source_type)
4019 || (get_alias_set (TREE_TYPE (gnu_source_type))
4020 != get_alias_set (TREE_TYPE (gnu_target_type)))))
4023 ("?possible aliasing problem for type&",
4024 gnat_node, Target_Type (gnat_node));
4026 ("\\?use -fno-strict-aliasing switch for references",
4029 ("\\?or use `pragma No_Strict_Aliasing (&);`",
4030 gnat_node, Target_Type (gnat_node));
4033 /* The No_Strict_Aliasing flag is not propagated to the back-end for
4034 fat pointers so unconditionally warn in problematic cases. */
4035 else if (TYPE_FAT_POINTER_P (gnu_target_type))
4038 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (gnu_target_type)));
4040 if (get_alias_set (array_type) != 0
4041 && (!TYPE_FAT_POINTER_P (gnu_source_type)
4042 || (get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (gnu_source_type))))
4043 != get_alias_set (array_type))))
4046 ("?possible aliasing problem for type&",
4047 gnat_node, Target_Type (gnat_node));
4049 ("\\?use -fno-strict-aliasing switch for references",
4054 gnu_result = alloc_stmt_list ();
4057 case N_Raise_Statement:
4058 case N_Function_Specification:
4059 case N_Procedure_Specification:
4061 case N_Component_Association:
4064 gcc_assert (type_annotate_only);
4065 gnu_result = alloc_stmt_list ();
4068 /* If we pushed our level as part of processing the elaboration routine,
4070 if (went_into_elab_proc)
4072 add_stmt (gnu_result);
4074 gnu_result = end_stmt_group ();
4075 current_function_decl = NULL_TREE;
4078 /* Set the location information into the result. Note that we may have
4079 no result if we tried to build a CALL_EXPR node to a procedure with
4080 no side-effects and optimization is enabled. */
4081 if (gnu_result && EXPR_P (gnu_result))
4082 annotate_with_node (gnu_result, gnat_node);
4084 /* If we're supposed to return something of void_type, it means we have
4085 something we're elaborating for effect, so just return. */
4086 if (TREE_CODE (gnu_result_type) == VOID_TYPE)
4089 /* If the result is a constant that overflows, raise constraint error. */
4090 else if (TREE_CODE (gnu_result) == INTEGER_CST
4091 && TREE_CONSTANT_OVERFLOW (gnu_result))
4093 post_error ("Constraint_Error will be raised at run-time?", gnat_node);
4096 = build1 (NULL_EXPR, gnu_result_type,
4097 build_call_raise (CE_Overflow_Check_Failed));
4100 /* If our result has side-effects and is of an unconstrained type,
4101 make a SAVE_EXPR so that we can be sure it will only be referenced
4102 once. Note we must do this before any conversions. */
4103 if (TREE_SIDE_EFFECTS (gnu_result)
4104 && (TREE_CODE (gnu_result_type) == UNCONSTRAINED_ARRAY_TYPE
4105 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type))))
4106 gnu_result = gnat_stabilize_reference (gnu_result, 0);
4108 /* Now convert the result to the proper type. If the type is void or if
4109 we have no result, return error_mark_node to show we have no result.
4110 If the type of the result is correct or if we have a label (which doesn't
4111 have any well-defined type), return our result. Also don't do the
4112 conversion if the "desired" type involves a PLACEHOLDER_EXPR in its size
4113 since those are the cases where the front end may have the type wrong due
4114 to "instantiating" the unconstrained record with discriminant values
4115 or if this is a FIELD_DECL. If this is the Name of an assignment
4116 statement or a parameter of a procedure call, return what we have since
4117 the RHS has to be converted to our type there in that case, unless
4118 GNU_RESULT_TYPE has a simpler size. Similarly, if the two types are
4119 record types with the same name, the expression type has integral mode,
4120 and GNU_RESULT_TYPE BLKmode, don't convert. This will be the case when
4121 we are converting from a packable type to its actual type and we need
4122 those conversions to be NOPs in order for assignments into these types to
4123 work properly if the inner object is a bitfield and hence can't have
4124 its address taken. Finally, don't convert integral types that are the
4125 operand of an unchecked conversion since we need to ignore those
4126 conversions (for 'Valid). Otherwise, convert the result to the proper
4129 if (Present (Parent (gnat_node))
4130 && ((Nkind (Parent (gnat_node)) == N_Assignment_Statement
4131 && Name (Parent (gnat_node)) == gnat_node)
4132 || (Nkind (Parent (gnat_node)) == N_Procedure_Call_Statement
4133 && Name (Parent (gnat_node)) != gnat_node)
4134 || (Nkind (Parent (gnat_node)) == N_Unchecked_Type_Conversion
4135 && !AGGREGATE_TYPE_P (gnu_result_type)
4136 && !AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))
4137 || Nkind (Parent (gnat_node)) == N_Parameter_Association)
4138 && !(TYPE_SIZE (gnu_result_type)
4139 && TYPE_SIZE (TREE_TYPE (gnu_result))
4140 && (AGGREGATE_TYPE_P (gnu_result_type)
4141 == AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))
4142 && ((TREE_CODE (TYPE_SIZE (gnu_result_type)) == INTEGER_CST
4143 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_result)))
4145 || (TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST
4146 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type))
4147 && (CONTAINS_PLACEHOLDER_P
4148 (TYPE_SIZE (TREE_TYPE (gnu_result))))))
4149 && !(TREE_CODE (gnu_result_type) == RECORD_TYPE
4150 && TYPE_JUSTIFIED_MODULAR_P (gnu_result_type))))
4152 /* In this case remove padding only if the inner object is of
4153 self-referential size: in that case it must be an object of
4154 unconstrained type with a default discriminant. In other cases,
4155 we want to avoid copying too much data. */
4156 if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
4157 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result))
4158 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE
4159 (TREE_TYPE (TYPE_FIELDS
4160 (TREE_TYPE (gnu_result))))))
4161 gnu_result = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))),
4165 else if (TREE_CODE (gnu_result) == LABEL_DECL
4166 || TREE_CODE (gnu_result) == FIELD_DECL
4167 || TREE_CODE (gnu_result) == ERROR_MARK
4168 || (TYPE_SIZE (gnu_result_type)
4169 && TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST
4170 && TREE_CODE (gnu_result) != INDIRECT_REF
4171 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type)))
4172 || ((TYPE_NAME (gnu_result_type)
4173 == TYPE_NAME (TREE_TYPE (gnu_result)))
4174 && TREE_CODE (gnu_result_type) == RECORD_TYPE
4175 && TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
4176 && TYPE_MODE (gnu_result_type) == BLKmode
4177 && (GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (gnu_result)))
4180 /* Remove any padding record, but do nothing more in this case. */
4181 if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
4182 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result)))
4183 gnu_result = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))),
4187 else if (gnu_result == error_mark_node
4188 || gnu_result_type == void_type_node)
4189 gnu_result = error_mark_node;
4190 else if (gnu_result_type != TREE_TYPE (gnu_result))
4191 gnu_result = convert (gnu_result_type, gnu_result);
4193 /* We don't need any NOP_EXPR or NON_LVALUE_EXPR on GNU_RESULT. */
4194 while ((TREE_CODE (gnu_result) == NOP_EXPR
4195 || TREE_CODE (gnu_result) == NON_LVALUE_EXPR)
4196 && TREE_TYPE (TREE_OPERAND (gnu_result, 0)) == TREE_TYPE (gnu_result))
4197 gnu_result = TREE_OPERAND (gnu_result, 0);
4202 /* Record the current code position in GNAT_NODE. */
4205 record_code_position (Node_Id gnat_node)
4207 tree stmt_stmt = build1 (STMT_STMT, void_type_node, NULL_TREE);
4209 add_stmt_with_node (stmt_stmt, gnat_node);
4210 save_gnu_tree (gnat_node, stmt_stmt, true);
4213 /* Insert the code for GNAT_NODE at the position saved for that node. */
4216 insert_code_for (Node_Id gnat_node)
4218 STMT_STMT_STMT (get_gnu_tree (gnat_node)) = gnat_to_gnu (gnat_node);
4219 save_gnu_tree (gnat_node, NULL_TREE, true);
4222 /* Start a new statement group chained to the previous group. */
4227 struct stmt_group *group = stmt_group_free_list;
4229 /* First see if we can get one from the free list. */
4231 stmt_group_free_list = group->previous;
4233 group = (struct stmt_group *) ggc_alloc (sizeof (struct stmt_group));
4235 group->previous = current_stmt_group;
4236 group->stmt_list = group->block = group->cleanups = NULL_TREE;
4237 current_stmt_group = group;
4240 /* Add GNU_STMT to the current statement group. */
4243 add_stmt (tree gnu_stmt)
4245 append_to_statement_list (gnu_stmt, ¤t_stmt_group->stmt_list);
4247 /* If we're at top level, show everything in here is in use in case
4248 any of it is shared by a subprogram. */
4249 if (global_bindings_p ())
4250 walk_tree (&gnu_stmt, mark_visited, NULL, NULL);
4254 /* Similar, but set the location of GNU_STMT to that of GNAT_NODE. */
4257 add_stmt_with_node (tree gnu_stmt, Node_Id gnat_node)
4259 if (Present (gnat_node))
4260 annotate_with_node (gnu_stmt, gnat_node);
4261 add_stmt (gnu_stmt);
4264 /* Add a declaration statement for GNU_DECL to the current statement group.
4265 Get SLOC from Entity_Id. */
4268 add_decl_expr (tree gnu_decl, Entity_Id gnat_entity)
4272 /* If this is a variable that Gigi is to ignore, we may have been given
4273 an ERROR_MARK. So test for it. We also might have been given a
4274 reference for a renaming. So only do something for a decl. Also
4275 ignore a TYPE_DECL for an UNCONSTRAINED_ARRAY_TYPE. */
4276 if (!DECL_P (gnu_decl)
4277 || (TREE_CODE (gnu_decl) == TYPE_DECL
4278 && TREE_CODE (TREE_TYPE (gnu_decl)) == UNCONSTRAINED_ARRAY_TYPE))
4281 /* If we are global, we don't want to actually output the DECL_EXPR for
4282 this decl since we already have evaluated the expressions in the
4283 sizes and positions as globals and doing it again would be wrong.
4284 But we do have to mark everything as used. */
4285 gnu_stmt = build1 (DECL_EXPR, void_type_node, gnu_decl);
4286 if (!global_bindings_p ())
4287 add_stmt_with_node (gnu_stmt, gnat_entity);
4290 walk_tree (&gnu_stmt, mark_visited, NULL, NULL);
4291 if (TREE_CODE (gnu_decl) == VAR_DECL
4292 || TREE_CODE (gnu_decl) == CONST_DECL)
4294 walk_tree (&DECL_SIZE (gnu_decl), mark_visited, NULL, NULL);
4295 walk_tree (&DECL_SIZE_UNIT (gnu_decl), mark_visited, NULL, NULL);
4296 walk_tree (&DECL_INITIAL (gnu_decl), mark_visited, NULL, NULL);
4300 /* If this is a DECL_EXPR for a variable with DECL_INITIAL set,
4301 there are two cases we need to handle here. */
4302 if (TREE_CODE (gnu_decl) == VAR_DECL && DECL_INITIAL (gnu_decl))
4304 tree gnu_init = DECL_INITIAL (gnu_decl);
4305 tree gnu_lhs = NULL_TREE;
4307 /* If this is a DECL_EXPR for a variable with DECL_INITIAL set
4308 and decl has a padded type, convert it to the unpadded type so the
4309 assignment is done properly. */
4310 if (TREE_CODE (TREE_TYPE (gnu_decl)) == RECORD_TYPE
4311 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_decl)))
4313 = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_decl))), gnu_decl);
4315 /* Otherwise, if this is going into memory and the initializer isn't
4316 valid for the assembler and loader. Gimplification could do this,
4317 but would be run too late if -fno-unit-at-a-time. */
4318 else if (TREE_STATIC (gnu_decl)
4319 && !initializer_constant_valid_p (gnu_init,
4320 TREE_TYPE (gnu_decl)))
4325 tree gnu_assign_stmt
4326 = build_binary_op (MODIFY_EXPR, NULL_TREE,
4327 gnu_lhs, DECL_INITIAL (gnu_decl));
4329 DECL_INITIAL (gnu_decl) = 0;
4330 TREE_READONLY (gnu_decl) = 0;
4331 annotate_with_locus (gnu_assign_stmt,
4332 DECL_SOURCE_LOCATION (gnu_decl));
4333 add_stmt (gnu_assign_stmt);
4338 /* Utility function to mark nodes with TREE_VISITED and types as having their
4339 sized gimplified. Called from walk_tree. We use this to indicate all
4340 variable sizes and positions in global types may not be shared by any
4344 mark_visited (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
4346 if (TREE_VISITED (*tp))
4349 /* Don't mark a dummy type as visited because we want to mark its sizes
4350 and fields once it's filled in. */
4351 else if (!TYPE_IS_DUMMY_P (*tp))
4352 TREE_VISITED (*tp) = 1;
4355 TYPE_SIZES_GIMPLIFIED (*tp) = 1;
4360 /* Likewise, but to mark as unvisited. */
4363 mark_unvisited (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
4364 void *data ATTRIBUTE_UNUSED)
4366 TREE_VISITED (*tp) = 0;
4371 /* Add GNU_CLEANUP, a cleanup action, to the current code group. */
4374 add_cleanup (tree gnu_cleanup)
4376 append_to_statement_list (gnu_cleanup, ¤t_stmt_group->cleanups);
4379 /* Set the BLOCK node corresponding to the current code group to GNU_BLOCK. */
4382 set_block_for_group (tree gnu_block)
4384 gcc_assert (!current_stmt_group->block);
4385 current_stmt_group->block = gnu_block;
4388 /* Return code corresponding to the current code group. It is normally
4389 a STATEMENT_LIST, but may also be a BIND_EXPR or TRY_FINALLY_EXPR if
4390 BLOCK or cleanups were set. */
4395 struct stmt_group *group = current_stmt_group;
4396 tree gnu_retval = group->stmt_list;
4398 /* If this is a null list, allocate a new STATEMENT_LIST. Then, if there
4399 are cleanups, make a TRY_FINALLY_EXPR. Last, if there is a BLOCK,
4400 make a BIND_EXPR. Note that we nest in that because the cleanup may
4401 reference variables in the block. */
4402 if (gnu_retval == NULL_TREE)
4403 gnu_retval = alloc_stmt_list ();
4405 if (group->cleanups)
4406 gnu_retval = build2 (TRY_FINALLY_EXPR, void_type_node, gnu_retval,
4409 if (current_stmt_group->block)
4410 gnu_retval = build3 (BIND_EXPR, void_type_node, BLOCK_VARS (group->block),
4411 gnu_retval, group->block);
4413 /* Remove this group from the stack and add it to the free list. */
4414 current_stmt_group = group->previous;
4415 group->previous = stmt_group_free_list;
4416 stmt_group_free_list = group;
4421 /* Add a list of statements from GNAT_LIST, a possibly-empty list of
4425 add_stmt_list (List_Id gnat_list)
4429 if (Present (gnat_list))
4430 for (gnat_node = First (gnat_list); Present (gnat_node);
4431 gnat_node = Next (gnat_node))
4432 add_stmt (gnat_to_gnu (gnat_node));
4435 /* Build a tree from GNAT_LIST, a possibly-empty list of statements.
4436 If BINDING_P is true, push and pop a binding level around the list. */
4439 build_stmt_group (List_Id gnat_list, bool binding_p)
4441 start_stmt_group ();
4445 add_stmt_list (gnat_list);
4449 return end_stmt_group ();
4452 /* Push and pop routines for stacks. We keep a free list around so we
4453 don't waste tree nodes. */
4456 push_stack (tree *gnu_stack_ptr, tree gnu_purpose, tree gnu_value)
4458 tree gnu_node = gnu_stack_free_list;
4462 gnu_stack_free_list = TREE_CHAIN (gnu_node);
4463 TREE_CHAIN (gnu_node) = *gnu_stack_ptr;
4464 TREE_PURPOSE (gnu_node) = gnu_purpose;
4465 TREE_VALUE (gnu_node) = gnu_value;
4468 gnu_node = tree_cons (gnu_purpose, gnu_value, *gnu_stack_ptr);
4470 *gnu_stack_ptr = gnu_node;
4474 pop_stack (tree *gnu_stack_ptr)
4476 tree gnu_node = *gnu_stack_ptr;
4478 *gnu_stack_ptr = TREE_CHAIN (gnu_node);
4479 TREE_CHAIN (gnu_node) = gnu_stack_free_list;
4480 gnu_stack_free_list = gnu_node;
4483 /* GNU_STMT is a statement. We generate code for that statement. */
4486 gnat_expand_stmt (tree gnu_stmt)
4489 tree gnu_elmt, gnu_elmt_2;
4492 switch (TREE_CODE (gnu_stmt))
4496 /* First write a volatile ASM_INPUT to prevent anything from being
4498 gnu_elmt = gen_rtx_ASM_INPUT (VOIDmode, "");
4499 MEM_VOLATILE_P (gnu_elmt) = 1;
4500 emit_insn (gnu_elmt);
4502 gnu_elmt = expand_expr (TREE_OPERAND (gnu_stmt, 0), NULL_RTX, VOIDmode,
4504 emit_insn (gen_rtx_USE (VOIDmode, ));
4513 /* Generate GIMPLE in place for the expression at *EXPR_P. */
4516 gnat_gimplify_expr (tree *expr_p, tree *pre_p, tree *post_p ATTRIBUTE_UNUSED)
4518 tree expr = *expr_p;
4520 if (IS_ADA_STMT (expr))
4521 return gnat_gimplify_stmt (expr_p);
4523 switch (TREE_CODE (expr))
4526 /* If this is for a scalar, just make a VAR_DECL for it. If for
4527 an aggregate, get a null pointer of the appropriate type and
4529 if (AGGREGATE_TYPE_P (TREE_TYPE (expr)))
4530 *expr_p = build1 (INDIRECT_REF, TREE_TYPE (expr),
4531 convert (build_pointer_type (TREE_TYPE (expr)),
4532 integer_zero_node));
4535 *expr_p = create_tmp_var (TREE_TYPE (expr), NULL);
4536 TREE_NO_WARNING (*expr_p) = 1;
4539 append_to_statement_list (TREE_OPERAND (expr, 0), pre_p);
4542 case UNCONSTRAINED_ARRAY_REF:
4543 /* We should only do this if we are just elaborating for side-effects,
4544 but we can't know that yet. */
4545 *expr_p = TREE_OPERAND (*expr_p, 0);
4549 /* If we're taking the address of a constant CONSTRUCTOR, force it to
4550 be put into static memory. We know it's going to be readonly given
4551 the semantics we have and it's required to be static memory in
4552 the case when the reference is in an elaboration procedure. */
4553 if (TREE_CODE (TREE_OPERAND (expr, 0)) == CONSTRUCTOR
4554 && TREE_CONSTANT (TREE_OPERAND (expr, 0)))
4557 = create_tmp_var (TREE_TYPE (TREE_OPERAND (expr, 0)), "C");
4559 TREE_READONLY (new_var) = 1;
4560 TREE_STATIC (new_var) = 1;
4561 TREE_ADDRESSABLE (new_var) = 1;
4562 DECL_INITIAL (new_var) = TREE_OPERAND (expr, 0);
4564 TREE_OPERAND (expr, 0) = new_var;
4565 recompute_tree_invarant_for_addr_expr (expr);
4568 return GS_UNHANDLED;
4571 /* We have a kludge here. If the FIELD_DECL is from a fat pointer and is
4572 from an early dummy type, replace it with the proper FIELD_DECL. */
4573 if (TYPE_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (*expr_p, 0)))
4574 && DECL_ORIGINAL_FIELD (TREE_OPERAND (*expr_p, 1)))
4576 TREE_OPERAND (*expr_p, 1)
4577 = DECL_ORIGINAL_FIELD (TREE_OPERAND (*expr_p, 1));
4581 /* ... fall through ... */
4584 return GS_UNHANDLED;
4588 /* Generate GIMPLE in place for the statement at *STMT_P. */
4590 static enum gimplify_status
4591 gnat_gimplify_stmt (tree *stmt_p)
4593 tree stmt = *stmt_p;
4595 switch (TREE_CODE (stmt))
4598 *stmt_p = STMT_STMT_STMT (stmt);
4602 *stmt_p = NULL_TREE;
4607 tree gnu_start_label = create_artificial_label ();
4608 tree gnu_end_label = LOOP_STMT_LABEL (stmt);
4610 /* Set to emit the statements of the loop. */
4611 *stmt_p = NULL_TREE;
4613 /* We first emit the start label and then a conditional jump to
4614 the end label if there's a top condition, then the body of the
4615 loop, then a conditional branch to the end label, then the update,
4616 if any, and finally a jump to the start label and the definition
4617 of the end label. */
4618 append_to_statement_list (build1 (LABEL_EXPR, void_type_node,
4622 if (LOOP_STMT_TOP_COND (stmt))
4623 append_to_statement_list (build3 (COND_EXPR, void_type_node,
4624 LOOP_STMT_TOP_COND (stmt),
4631 append_to_statement_list (LOOP_STMT_BODY (stmt), stmt_p);
4633 if (LOOP_STMT_BOT_COND (stmt))
4634 append_to_statement_list (build3 (COND_EXPR, void_type_node,
4635 LOOP_STMT_BOT_COND (stmt),
4642 if (LOOP_STMT_UPDATE (stmt))
4643 append_to_statement_list (LOOP_STMT_UPDATE (stmt), stmt_p);
4645 append_to_statement_list (build1 (GOTO_EXPR, void_type_node,
4648 append_to_statement_list (build1 (LABEL_EXPR, void_type_node,
4655 /* Build a statement to jump to the corresponding end label, then
4656 see if it needs to be conditional. */
4657 *stmt_p = build1 (GOTO_EXPR, void_type_node, EXIT_STMT_LABEL (stmt));
4658 if (EXIT_STMT_COND (stmt))
4659 *stmt_p = build3 (COND_EXPR, void_type_node,
4660 EXIT_STMT_COND (stmt), *stmt_p, alloc_stmt_list ());
4668 /* Force references to each of the entities in packages GNAT_NODE with's
4669 so that the debugging information for all of them are identical
4670 in all clients. Operate recursively on anything it with's, but check
4671 that we aren't elaborating something more than once. */
4673 /* The reason for this routine's existence is two-fold.
4674 First, with some debugging formats, notably MDEBUG on SGI
4675 IRIX, the linker will remove duplicate debugging information if two
4676 clients have identical debugguing information. With the normal scheme
4677 of elaboration, this does not usually occur, since entities in with'ed
4678 packages are elaborated on demand, and if clients have different usage
4679 patterns, the normal case, then the order and selection of entities
4680 will differ. In most cases however, it seems that linkers do not know
4681 how to eliminate duplicate debugging information, even if it is
4682 identical, so the use of this routine would increase the total amount
4683 of debugging information in the final executable.
4685 Second, this routine is called in type_annotate mode, to compute DDA
4686 information for types in withed units, for ASIS use */
4689 elaborate_all_entities (Node_Id gnat_node)
4691 Entity_Id gnat_with_clause, gnat_entity;
4693 /* Process each unit only once. As we trace the context of all relevant
4694 units transitively, including generic bodies, we may encounter the
4695 same generic unit repeatedly */
4697 if (!present_gnu_tree (gnat_node))
4698 save_gnu_tree (gnat_node, integer_zero_node, true);
4700 /* Save entities in all context units. A body may have an implicit_with
4701 on its own spec, if the context includes a child unit, so don't save
4704 for (gnat_with_clause = First (Context_Items (gnat_node));
4705 Present (gnat_with_clause);
4706 gnat_with_clause = Next (gnat_with_clause))
4707 if (Nkind (gnat_with_clause) == N_With_Clause
4708 && !present_gnu_tree (Library_Unit (gnat_with_clause))
4709 && Library_Unit (gnat_with_clause) != Library_Unit (Cunit (Main_Unit)))
4711 elaborate_all_entities (Library_Unit (gnat_with_clause));
4713 if (Ekind (Entity (Name (gnat_with_clause))) == E_Package)
4715 for (gnat_entity = First_Entity (Entity (Name (gnat_with_clause)));
4716 Present (gnat_entity);
4717 gnat_entity = Next_Entity (gnat_entity))
4718 if (Is_Public (gnat_entity)
4719 && Convention (gnat_entity) != Convention_Intrinsic
4720 && Ekind (gnat_entity) != E_Package
4721 && Ekind (gnat_entity) != E_Package_Body
4722 && Ekind (gnat_entity) != E_Operator
4723 && !(IN (Ekind (gnat_entity), Type_Kind)
4724 && !Is_Frozen (gnat_entity))
4725 && !((Ekind (gnat_entity) == E_Procedure
4726 || Ekind (gnat_entity) == E_Function)
4727 && Is_Intrinsic_Subprogram (gnat_entity))
4728 && !IN (Ekind (gnat_entity), Named_Kind)
4729 && !IN (Ekind (gnat_entity), Generic_Unit_Kind))
4730 gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4732 else if (Ekind (Entity (Name (gnat_with_clause))) == E_Generic_Package)
4735 = Corresponding_Body (Unit (Library_Unit (gnat_with_clause)));
4737 /* Retrieve compilation unit node of generic body. */
4738 while (Present (gnat_body)
4739 && Nkind (gnat_body) != N_Compilation_Unit)
4740 gnat_body = Parent (gnat_body);
4742 /* If body is available, elaborate its context. */
4743 if (Present (gnat_body))
4744 elaborate_all_entities (gnat_body);
4748 if (Nkind (Unit (gnat_node)) == N_Package_Body && type_annotate_only)
4749 elaborate_all_entities (Library_Unit (gnat_node));
4752 /* Do the processing of N_Freeze_Entity, GNAT_NODE. */
4755 process_freeze_entity (Node_Id gnat_node)
4757 Entity_Id gnat_entity = Entity (gnat_node);
4761 = (Nkind (Declaration_Node (gnat_entity)) == N_Object_Declaration
4762 && present_gnu_tree (Declaration_Node (gnat_entity)))
4763 ? get_gnu_tree (Declaration_Node (gnat_entity)) : NULL_TREE;
4765 /* If this is a package, need to generate code for the package. */
4766 if (Ekind (gnat_entity) == E_Package)
4769 (Parent (Corresponding_Body
4770 (Parent (Declaration_Node (gnat_entity)))));
4774 /* Check for old definition after the above call. This Freeze_Node
4775 might be for one its Itypes. */
4777 = present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity) : 0;
4779 /* If this entity has an Address representation clause, GNU_OLD is the
4780 address, so discard it here. */
4781 if (Present (Address_Clause (gnat_entity)))
4784 /* Don't do anything for class-wide types they are always
4785 transformed into their root type. */
4786 if (Ekind (gnat_entity) == E_Class_Wide_Type
4787 || (Ekind (gnat_entity) == E_Class_Wide_Subtype
4788 && Present (Equivalent_Type (gnat_entity))))
4791 /* Don't do anything for subprograms that may have been elaborated before
4792 their freeze nodes. This can happen, for example because of an inner call
4793 in an instance body, or a previous compilation of a spec for inlining
4796 && TREE_CODE (gnu_old) == FUNCTION_DECL
4797 && (Ekind (gnat_entity) == E_Function
4798 || Ekind (gnat_entity) == E_Procedure))
4800 && (TREE_CODE (TREE_TYPE (gnu_old)) == FUNCTION_TYPE
4801 && Ekind (gnat_entity) == E_Subprogram_Type)))
4804 /* If we have a non-dummy type old tree, we have nothing to do. Unless
4805 this is the public view of a private type whose full view was not
4806 delayed, this node was never delayed as it should have been.
4807 Also allow this to happen for concurrent types since we may have
4808 frozen both the Corresponding_Record_Type and this type. */
4810 && !(TREE_CODE (gnu_old) == TYPE_DECL
4811 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old))))
4813 gcc_assert ((IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
4814 && Present (Full_View (gnat_entity))
4815 && No (Freeze_Node (Full_View (gnat_entity))))
4816 || Is_Concurrent_Type (gnat_entity));
4820 /* Reset the saved tree, if any, and elaborate the object or type for real.
4821 If there is a full declaration, elaborate it and copy the type to
4822 GNAT_ENTITY. Likewise if this is the record subtype corresponding to
4823 a class wide type or subtype. */
4826 save_gnu_tree (gnat_entity, NULL_TREE, false);
4827 if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
4828 && Present (Full_View (gnat_entity))
4829 && present_gnu_tree (Full_View (gnat_entity)))
4830 save_gnu_tree (Full_View (gnat_entity), NULL_TREE, false);
4831 if (Present (Class_Wide_Type (gnat_entity))
4832 && Class_Wide_Type (gnat_entity) != gnat_entity)
4833 save_gnu_tree (Class_Wide_Type (gnat_entity), NULL_TREE, false);
4836 if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
4837 && Present (Full_View (gnat_entity)))
4839 gnu_new = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 1);
4841 /* Propagate back-annotations from full view to partial view. */
4842 if (Unknown_Alignment (gnat_entity))
4843 Set_Alignment (gnat_entity, Alignment (Full_View (gnat_entity)));
4845 if (Unknown_Esize (gnat_entity))
4846 Set_Esize (gnat_entity, Esize (Full_View (gnat_entity)));
4848 if (Unknown_RM_Size (gnat_entity))
4849 Set_RM_Size (gnat_entity, RM_Size (Full_View (gnat_entity)));
4851 /* The above call may have defined this entity (the simplest example
4852 of this is when we have a private enumeral type since the bounds
4853 will have the public view. */
4854 if (!present_gnu_tree (gnat_entity))
4855 save_gnu_tree (gnat_entity, gnu_new, false);
4856 if (Present (Class_Wide_Type (gnat_entity))
4857 && Class_Wide_Type (gnat_entity) != gnat_entity)
4858 save_gnu_tree (Class_Wide_Type (gnat_entity), gnu_new, false);
4861 gnu_new = gnat_to_gnu_entity (gnat_entity, gnu_init, 1);
4863 /* If we've made any pointers to the old version of this type, we
4864 have to update them. */
4866 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)),
4867 TREE_TYPE (gnu_new));
4870 /* Process the list of inlined subprograms of GNAT_NODE, which is an
4871 N_Compilation_Unit. */
4874 process_inlined_subprograms (Node_Id gnat_node)
4876 Entity_Id gnat_entity;
4879 /* If we can inline, generate RTL for all the inlined subprograms.
4880 Define the entity first so we set DECL_EXTERNAL. */
4881 if (optimize > 0 && !flag_really_no_inline)
4882 for (gnat_entity = First_Inlined_Subprogram (gnat_node);
4883 Present (gnat_entity);
4884 gnat_entity = Next_Inlined_Subprogram (gnat_entity))
4886 gnat_body = Parent (Declaration_Node (gnat_entity));
4888 if (Nkind (gnat_body) != N_Subprogram_Body)
4890 /* ??? This really should always be Present. */
4891 if (No (Corresponding_Body (gnat_body)))
4895 = Parent (Declaration_Node (Corresponding_Body (gnat_body)));
4898 if (Present (gnat_body))
4900 gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4901 add_stmt (gnat_to_gnu (gnat_body));
4906 /* Elaborate decls in the lists GNAT_DECLS and GNAT_DECLS2, if present.
4907 We make two passes, one to elaborate anything other than bodies (but
4908 we declare a function if there was no spec). The second pass
4909 elaborates the bodies.
4911 GNAT_END_LIST gives the element in the list past the end. Normally,
4912 this is Empty, but can be First_Real_Statement for a
4913 Handled_Sequence_Of_Statements.
4915 We make a complete pass through both lists if PASS1P is true, then make
4916 the second pass over both lists if PASS2P is true. The lists usually
4917 correspond to the public and private parts of a package. */
4920 process_decls (List_Id gnat_decls, List_Id gnat_decls2,
4921 Node_Id gnat_end_list, bool pass1p, bool pass2p)
4923 List_Id gnat_decl_array[2];
4927 gnat_decl_array[0] = gnat_decls, gnat_decl_array[1] = gnat_decls2;
4930 for (i = 0; i <= 1; i++)
4931 if (Present (gnat_decl_array[i]))
4932 for (gnat_decl = First (gnat_decl_array[i]);
4933 gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl))
4935 /* For package specs, we recurse inside the declarations,
4936 thus taking the two pass approach inside the boundary. */
4937 if (Nkind (gnat_decl) == N_Package_Declaration
4938 && (Nkind (Specification (gnat_decl)
4939 == N_Package_Specification)))
4940 process_decls (Visible_Declarations (Specification (gnat_decl)),
4941 Private_Declarations (Specification (gnat_decl)),
4942 Empty, true, false);
4944 /* Similarly for any declarations in the actions of a
4946 else if (Nkind (gnat_decl) == N_Freeze_Entity)
4948 process_freeze_entity (gnat_decl);
4949 process_decls (Actions (gnat_decl), Empty, Empty, true, false);
4952 /* Package bodies with freeze nodes get their elaboration deferred
4953 until the freeze node, but the code must be placed in the right
4954 place, so record the code position now. */
4955 else if (Nkind (gnat_decl) == N_Package_Body
4956 && Present (Freeze_Node (Corresponding_Spec (gnat_decl))))
4957 record_code_position (gnat_decl);
4959 else if (Nkind (gnat_decl) == N_Package_Body_Stub
4960 && Present (Library_Unit (gnat_decl))
4961 && Present (Freeze_Node
4964 (Library_Unit (gnat_decl)))))))
4965 record_code_position
4966 (Proper_Body (Unit (Library_Unit (gnat_decl))));
4968 /* We defer most subprogram bodies to the second pass. */
4969 else if (Nkind (gnat_decl) == N_Subprogram_Body)
4971 if (Acts_As_Spec (gnat_decl))
4973 Node_Id gnat_subprog_id = Defining_Entity (gnat_decl);
4975 if (Ekind (gnat_subprog_id) != E_Generic_Procedure
4976 && Ekind (gnat_subprog_id) != E_Generic_Function)
4977 gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, 1);
4980 /* For bodies and stubs that act as their own specs, the entity
4981 itself must be elaborated in the first pass, because it may
4982 be used in other declarations. */
4983 else if (Nkind (gnat_decl) == N_Subprogram_Body_Stub)
4985 Node_Id gnat_subprog_id =
4986 Defining_Entity (Specification (gnat_decl));
4988 if (Ekind (gnat_subprog_id) != E_Subprogram_Body
4989 && Ekind (gnat_subprog_id) != E_Generic_Procedure
4990 && Ekind (gnat_subprog_id) != E_Generic_Function)
4991 gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, 1);
4994 /* Concurrent stubs stand for the corresponding subprogram bodies,
4995 which are deferred like other bodies. */
4996 else if (Nkind (gnat_decl) == N_Task_Body_Stub
4997 || Nkind (gnat_decl) == N_Protected_Body_Stub)
5000 add_stmt (gnat_to_gnu (gnat_decl));
5003 /* Here we elaborate everything we deferred above except for package bodies,
5004 which are elaborated at their freeze nodes. Note that we must also
5005 go inside things (package specs and freeze nodes) the first pass did. */
5007 for (i = 0; i <= 1; i++)
5008 if (Present (gnat_decl_array[i]))
5009 for (gnat_decl = First (gnat_decl_array[i]);
5010 gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl))
5012 if (Nkind (gnat_decl) == N_Subprogram_Body
5013 || Nkind (gnat_decl) == N_Subprogram_Body_Stub
5014 || Nkind (gnat_decl) == N_Task_Body_Stub
5015 || Nkind (gnat_decl) == N_Protected_Body_Stub)
5016 add_stmt (gnat_to_gnu (gnat_decl));
5018 else if (Nkind (gnat_decl) == N_Package_Declaration
5019 && (Nkind (Specification (gnat_decl)
5020 == N_Package_Specification)))
5021 process_decls (Visible_Declarations (Specification (gnat_decl)),
5022 Private_Declarations (Specification (gnat_decl)),
5023 Empty, false, true);
5025 else if (Nkind (gnat_decl) == N_Freeze_Entity)
5026 process_decls (Actions (gnat_decl), Empty, Empty, false, true);
5030 /* Emit code for a range check. GNU_EXPR is the expression to be checked,
5031 GNAT_RANGE_TYPE the gnat type or subtype containing the bounds against
5032 which we have to check. */
5035 emit_range_check (tree gnu_expr, Entity_Id gnat_range_type)
5037 tree gnu_range_type = get_unpadded_type (gnat_range_type);
5038 tree gnu_low = TYPE_MIN_VALUE (gnu_range_type);
5039 tree gnu_high = TYPE_MAX_VALUE (gnu_range_type);
5040 tree gnu_compare_type = get_base_type (TREE_TYPE (gnu_expr));
5042 /* If GNU_EXPR has an integral type that is narrower than GNU_RANGE_TYPE,
5043 we can't do anything since we might be truncating the bounds. No
5044 check is needed in this case. */
5045 if (INTEGRAL_TYPE_P (TREE_TYPE (gnu_expr))
5046 && (TYPE_PRECISION (gnu_compare_type)
5047 < TYPE_PRECISION (get_base_type (gnu_range_type))))
5050 /* Checked expressions must be evaluated only once. */
5051 gnu_expr = protect_multiple_eval (gnu_expr);
5053 /* There's no good type to use here, so we might as well use
5054 integer_type_node. Note that the form of the check is
5055 (not (expr >= lo)) or (not (expr >= hi))
5056 the reason for this slightly convoluted form is that NaN's
5057 are not considered to be in range in the float case. */
5059 (build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
5061 (build_binary_op (GE_EXPR, integer_type_node,
5062 convert (gnu_compare_type, gnu_expr),
5063 convert (gnu_compare_type, gnu_low))),
5065 (build_binary_op (LE_EXPR, integer_type_node,
5066 convert (gnu_compare_type, gnu_expr),
5067 convert (gnu_compare_type,
5069 gnu_expr, CE_Range_Check_Failed);
5072 /* Emit code for an index check. GNU_ARRAY_OBJECT is the array object
5073 which we are about to index, GNU_EXPR is the index expression to be
5074 checked, GNU_LOW and GNU_HIGH are the lower and upper bounds
5075 against which GNU_EXPR has to be checked. Note that for index
5076 checking we cannot use the emit_range_check function (although very
5077 similar code needs to be generated in both cases) since for index
5078 checking the array type against which we are checking the indeces
5079 may be unconstrained and consequently we need to retrieve the
5080 actual index bounds from the array object itself
5081 (GNU_ARRAY_OBJECT). The place where we need to do that is in
5082 subprograms having unconstrained array formal parameters */
5085 emit_index_check (tree gnu_array_object,
5090 tree gnu_expr_check;
5092 /* Checked expressions must be evaluated only once. */
5093 gnu_expr = protect_multiple_eval (gnu_expr);
5095 /* Must do this computation in the base type in case the expression's
5096 type is an unsigned subtypes. */
5097 gnu_expr_check = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
5099 /* If GNU_LOW or GNU_HIGH are a PLACEHOLDER_EXPR, qualify them by
5100 the object we are handling. */
5101 gnu_low = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_low, gnu_array_object);
5102 gnu_high = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_high, gnu_array_object);
5104 /* There's no good type to use here, so we might as well use
5105 integer_type_node. */
5107 (build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
5108 build_binary_op (LT_EXPR, integer_type_node,
5110 convert (TREE_TYPE (gnu_expr_check),
5112 build_binary_op (GT_EXPR, integer_type_node,
5114 convert (TREE_TYPE (gnu_expr_check),
5116 gnu_expr, CE_Index_Check_Failed);
5119 /* GNU_COND contains the condition corresponding to an access, discriminant or
5120 range check of value GNU_EXPR. Build a COND_EXPR that returns GNU_EXPR if
5121 GNU_COND is false and raises a CONSTRAINT_ERROR if GNU_COND is true.
5122 REASON is the code that says why the exception was raised. */
5125 emit_check (tree gnu_cond, tree gnu_expr, int reason)
5130 gnu_call = build_call_raise (reason);
5132 /* Use an outer COMPOUND_EXPR to make sure that GNU_EXPR will get evaluated
5133 in front of the comparison in case it ends up being a SAVE_EXPR. Put the
5134 whole thing inside its own SAVE_EXPR so the inner SAVE_EXPR doesn't leak
5136 gnu_result = fold (build3 (COND_EXPR, TREE_TYPE (gnu_expr), gnu_cond,
5137 build2 (COMPOUND_EXPR, TREE_TYPE (gnu_expr),
5138 gnu_call, gnu_expr),
5141 /* If GNU_EXPR has side effects, make the outer COMPOUND_EXPR and
5142 protect it. Otherwise, show GNU_RESULT has no side effects: we
5143 don't need to evaluate it just for the check. */
5144 if (TREE_SIDE_EFFECTS (gnu_expr))
5146 = build2 (COMPOUND_EXPR, TREE_TYPE (gnu_expr), gnu_expr, gnu_result);
5148 TREE_SIDE_EFFECTS (gnu_result) = 0;
5150 /* ??? Unfortunately, if we don't put a SAVE_EXPR around this whole thing,
5151 we will repeatedly do the test. It would be nice if GCC was able
5152 to optimize this and only do it once. */
5153 return save_expr (gnu_result);
5156 /* Return an expression that converts GNU_EXPR to GNAT_TYPE, doing
5157 overflow checks if OVERFLOW_P is nonzero and range checks if
5158 RANGE_P is nonzero. GNAT_TYPE is known to be an integral type.
5159 If TRUNCATE_P is nonzero, do a float to integer conversion with
5160 truncation; otherwise round. */
5163 convert_with_check (Entity_Id gnat_type, tree gnu_expr, bool overflowp,
5164 bool rangep, bool truncatep)
5166 tree gnu_type = get_unpadded_type (gnat_type);
5167 tree gnu_in_type = TREE_TYPE (gnu_expr);
5168 tree gnu_in_basetype = get_base_type (gnu_in_type);
5169 tree gnu_base_type = get_base_type (gnu_type);
5170 tree gnu_ada_base_type = get_ada_base_type (gnu_type);
5171 tree gnu_result = gnu_expr;
5173 /* If we are not doing any checks, the output is an integral type, and
5174 the input is not a floating type, just do the conversion. This
5175 shortcut is required to avoid problems with packed array types
5176 and simplifies code in all cases anyway. */
5177 if (!rangep && !overflowp && INTEGRAL_TYPE_P (gnu_base_type)
5178 && !FLOAT_TYPE_P (gnu_in_type))
5179 return convert (gnu_type, gnu_expr);
5181 /* First convert the expression to its base type. This
5182 will never generate code, but makes the tests below much simpler.
5183 But don't do this if converting from an integer type to an unconstrained
5184 array type since then we need to get the bounds from the original
5186 if (TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE)
5187 gnu_result = convert (gnu_in_basetype, gnu_result);
5189 /* If overflow checks are requested, we need to be sure the result will
5190 fit in the output base type. But don't do this if the input
5191 is integer and the output floating-point. */
5193 && !(FLOAT_TYPE_P (gnu_base_type) && INTEGRAL_TYPE_P (gnu_in_basetype)))
5195 /* Ensure GNU_EXPR only gets evaluated once. */
5196 tree gnu_input = protect_multiple_eval (gnu_result);
5197 tree gnu_cond = integer_zero_node;
5198 tree gnu_in_lb = TYPE_MIN_VALUE (gnu_in_basetype);
5199 tree gnu_in_ub = TYPE_MAX_VALUE (gnu_in_basetype);
5200 tree gnu_out_lb = TYPE_MIN_VALUE (gnu_base_type);
5201 tree gnu_out_ub = TYPE_MAX_VALUE (gnu_base_type);
5203 /* Convert the lower bounds to signed types, so we're sure we're
5204 comparing them properly. Likewise, convert the upper bounds
5205 to unsigned types. */
5206 if (INTEGRAL_TYPE_P (gnu_in_basetype) && TYPE_UNSIGNED (gnu_in_basetype))
5207 gnu_in_lb = convert (gnat_signed_type (gnu_in_basetype), gnu_in_lb);
5209 if (INTEGRAL_TYPE_P (gnu_in_basetype)
5210 && !TYPE_UNSIGNED (gnu_in_basetype))
5211 gnu_in_ub = convert (gnat_unsigned_type (gnu_in_basetype), gnu_in_ub);
5213 if (INTEGRAL_TYPE_P (gnu_base_type) && TYPE_UNSIGNED (gnu_base_type))
5214 gnu_out_lb = convert (gnat_signed_type (gnu_base_type), gnu_out_lb);
5216 if (INTEGRAL_TYPE_P (gnu_base_type) && !TYPE_UNSIGNED (gnu_base_type))
5217 gnu_out_ub = convert (gnat_unsigned_type (gnu_base_type), gnu_out_ub);
5219 /* Check each bound separately and only if the result bound
5220 is tighter than the bound on the input type. Note that all the
5221 types are base types, so the bounds must be constant. Also,
5222 the comparison is done in the base type of the input, which
5223 always has the proper signedness. First check for input
5224 integer (which means output integer), output float (which means
5225 both float), or mixed, in which case we always compare.
5226 Note that we have to do the comparison which would *fail* in the
5227 case of an error since if it's an FP comparison and one of the
5228 values is a NaN or Inf, the comparison will fail. */
5229 if (INTEGRAL_TYPE_P (gnu_in_basetype)
5230 ? tree_int_cst_lt (gnu_in_lb, gnu_out_lb)
5231 : (FLOAT_TYPE_P (gnu_base_type)
5232 ? REAL_VALUES_LESS (TREE_REAL_CST (gnu_in_lb),
5233 TREE_REAL_CST (gnu_out_lb))
5237 (build_binary_op (GE_EXPR, integer_type_node,
5238 gnu_input, convert (gnu_in_basetype,
5241 if (INTEGRAL_TYPE_P (gnu_in_basetype)
5242 ? tree_int_cst_lt (gnu_out_ub, gnu_in_ub)
5243 : (FLOAT_TYPE_P (gnu_base_type)
5244 ? REAL_VALUES_LESS (TREE_REAL_CST (gnu_out_ub),
5245 TREE_REAL_CST (gnu_in_lb))
5248 = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node, gnu_cond,
5250 (build_binary_op (LE_EXPR, integer_type_node,
5252 convert (gnu_in_basetype,
5255 if (!integer_zerop (gnu_cond))
5256 gnu_result = emit_check (gnu_cond, gnu_input,
5257 CE_Overflow_Check_Failed);
5260 /* Now convert to the result base type. If this is a non-truncating
5261 float-to-integer conversion, round. */
5262 if (INTEGRAL_TYPE_P (gnu_ada_base_type) && FLOAT_TYPE_P (gnu_in_basetype)
5265 REAL_VALUE_TYPE half_minus_pred_half, pred_half;
5266 tree gnu_conv, gnu_zero, gnu_comp, gnu_saved_result, calc_type;
5267 tree gnu_pred_half, gnu_add_pred_half, gnu_subtract_pred_half;
5268 const struct real_format *fmt;
5270 /* The following calculations depend on proper rounding to even
5271 of each arithmetic operation. In order to prevent excess
5272 precision from spoiling this property, use the widest hardware
5273 floating-point type.
5275 FIXME: For maximum efficiency, this should only be done for machines
5276 and types where intermediates may have extra precision. */
5278 calc_type = longest_float_type_node;
5279 /* FIXME: Should not have padding in the first place */
5280 if (TREE_CODE (calc_type) == RECORD_TYPE
5281 && TYPE_IS_PADDING_P (calc_type))
5282 calc_type = TREE_TYPE (TYPE_FIELDS (calc_type));
5284 /* Compute the exact value calc_type'Pred (0.5) at compile time. */
5285 fmt = REAL_MODE_FORMAT (TYPE_MODE (calc_type));
5286 real_2expN (&half_minus_pred_half, -(fmt->p) - 1);
5287 REAL_ARITHMETIC (pred_half, MINUS_EXPR, dconsthalf,
5288 half_minus_pred_half);
5289 gnu_pred_half = build_real (calc_type, pred_half);
5291 /* If the input is strictly negative, subtract this value
5292 and otherwise add it from the input. For 0.5, the result
5293 is exactly between 1.0 and the machine number preceding 1.0
5294 (for calc_type). Since the last bit of 1.0 is even, this 0.5
5295 will round to 1.0, while all other number with an absolute
5296 value less than 0.5 round to 0.0. For larger numbers exactly
5297 halfway between integers, rounding will always be correct as
5298 the true mathematical result will be closer to the higher
5299 integer compared to the lower one. So, this constant works
5300 for all floating-point numbers.
5302 The reason to use the same constant with subtract/add instead
5303 of a positive and negative constant is to allow the comparison
5304 to be scheduled in parallel with retrieval of the constant and
5305 conversion of the input to the calc_type (if necessary).
5308 gnu_zero = convert (gnu_in_basetype, integer_zero_node);
5309 gnu_saved_result = save_expr (gnu_result);
5310 gnu_conv = convert (calc_type, gnu_saved_result);
5311 gnu_comp = build2 (GE_EXPR, integer_type_node,
5312 gnu_saved_result, gnu_zero);
5314 = build2 (PLUS_EXPR, calc_type, gnu_conv, gnu_pred_half);
5315 gnu_subtract_pred_half
5316 = build2 (MINUS_EXPR, calc_type, gnu_conv, gnu_pred_half);
5317 gnu_result = build3 (COND_EXPR, calc_type, gnu_comp,
5318 gnu_add_pred_half, gnu_subtract_pred_half);
5321 if (TREE_CODE (gnu_ada_base_type) == INTEGER_TYPE
5322 && TYPE_HAS_ACTUAL_BOUNDS_P (gnu_ada_base_type)
5323 && TREE_CODE (gnu_result) == UNCONSTRAINED_ARRAY_REF)
5324 gnu_result = unchecked_convert (gnu_ada_base_type, gnu_result, false);
5326 gnu_result = convert (gnu_ada_base_type, gnu_result);
5328 /* Finally, do the range check if requested. Note that if the
5329 result type is a modular type, the range check is actually
5330 an overflow check. */
5333 || (TREE_CODE (gnu_base_type) == INTEGER_TYPE
5334 && TYPE_MODULAR_P (gnu_base_type) && overflowp))
5335 gnu_result = emit_range_check (gnu_result, gnat_type);
5337 return convert (gnu_type, gnu_result);
5340 /* Return 1 if GNU_EXPR can be directly addressed. This is the case unless
5341 it is an expression involving computation or if it involves a reference
5342 to a bitfield or to a field not sufficiently aligned for its type. */
5345 addressable_p (tree gnu_expr)
5347 switch (TREE_CODE (gnu_expr))
5353 /* All DECLs are addressable: if they are in a register, we can force
5357 case UNCONSTRAINED_ARRAY_REF:
5365 return (!DECL_BIT_FIELD (TREE_OPERAND (gnu_expr, 1))
5366 && (!STRICT_ALIGNMENT
5367 /* If the field was marked as "semantically" addressable
5368 in create_field_decl, we are guaranteed that it can
5369 be directly addressed. */
5370 || !DECL_NONADDRESSABLE_P (TREE_OPERAND (gnu_expr, 1))
5371 /* Otherwise it can nevertheless be directly addressed
5372 if it has been sufficiently aligned in the record. */
5373 || DECL_ALIGN (TREE_OPERAND (gnu_expr, 1))
5374 >= TYPE_ALIGN (TREE_TYPE (gnu_expr)))
5375 && addressable_p (TREE_OPERAND (gnu_expr, 0)));
5377 case ARRAY_REF: case ARRAY_RANGE_REF:
5378 case REALPART_EXPR: case IMAGPART_EXPR:
5380 return addressable_p (TREE_OPERAND (gnu_expr, 0));
5383 return (AGGREGATE_TYPE_P (TREE_TYPE (gnu_expr))
5384 && addressable_p (TREE_OPERAND (gnu_expr, 0)));
5386 case VIEW_CONVERT_EXPR:
5388 /* This is addressable if we can avoid a copy. */
5389 tree type = TREE_TYPE (gnu_expr);
5390 tree inner_type = TREE_TYPE (TREE_OPERAND (gnu_expr, 0));
5392 return (((TYPE_MODE (type) == TYPE_MODE (inner_type)
5393 && (TYPE_ALIGN (type) <= TYPE_ALIGN (inner_type)
5394 || TYPE_ALIGN (inner_type) >= BIGGEST_ALIGNMENT))
5395 || ((TYPE_MODE (type) == BLKmode
5396 || TYPE_MODE (inner_type) == BLKmode)
5397 && (TYPE_ALIGN (type) <= TYPE_ALIGN (inner_type)
5398 || TYPE_ALIGN (inner_type) >= BIGGEST_ALIGNMENT
5399 || TYPE_ALIGN_OK (type)
5400 || TYPE_ALIGN_OK (inner_type))))
5401 && addressable_p (TREE_OPERAND (gnu_expr, 0)));
5409 /* Do the processing for the declaration of a GNAT_ENTITY, a type. If
5410 a separate Freeze node exists, delay the bulk of the processing. Otherwise
5411 make a GCC type for GNAT_ENTITY and set up the correspondence. */
5414 process_type (Entity_Id gnat_entity)
5417 = present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity) : 0;
5420 /* If we are to delay elaboration of this type, just do any
5421 elaborations needed for expressions within the declaration and
5422 make a dummy type entry for this node and its Full_View (if
5423 any) in case something points to it. Don't do this if it
5424 has already been done (the only way that can happen is if
5425 the private completion is also delayed). */
5426 if (Present (Freeze_Node (gnat_entity))
5427 || (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
5428 && Present (Full_View (gnat_entity))
5429 && Freeze_Node (Full_View (gnat_entity))
5430 && !present_gnu_tree (Full_View (gnat_entity))))
5432 elaborate_entity (gnat_entity);
5436 tree gnu_decl = create_type_decl (get_entity_name (gnat_entity),
5437 make_dummy_type (gnat_entity),
5438 NULL, false, false, gnat_entity);
5440 save_gnu_tree (gnat_entity, gnu_decl, false);
5441 if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
5442 && Present (Full_View (gnat_entity)))
5443 save_gnu_tree (Full_View (gnat_entity), gnu_decl, false);
5449 /* If we saved away a dummy type for this node it means that this
5450 made the type that corresponds to the full type of an incomplete
5451 type. Clear that type for now and then update the type in the
5455 if (TREE_CODE (gnu_old) != TYPE_DECL
5456 || !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old)))
5458 /* If this was a withed access type, this is not an error
5459 and merely indicates we've already elaborated the type
5461 gcc_assert (Is_Type (gnat_entity) && From_With_Type (gnat_entity));
5465 save_gnu_tree (gnat_entity, NULL_TREE, false);
5468 /* Now fully elaborate the type. */
5469 gnu_new = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 1);
5470 gcc_assert (TREE_CODE (gnu_new) == TYPE_DECL);
5472 /* If we have an old type and we've made pointers to this type,
5473 update those pointers. */
5475 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)),
5476 TREE_TYPE (gnu_new));
5478 /* If this is a record type corresponding to a task or protected type
5479 that is a completion of an incomplete type, perform a similar update
5481 /* ??? Including protected types here is a guess. */
5483 if (IN (Ekind (gnat_entity), Record_Kind)
5484 && Is_Concurrent_Record_Type (gnat_entity)
5485 && present_gnu_tree (Corresponding_Concurrent_Type (gnat_entity)))
5488 = get_gnu_tree (Corresponding_Concurrent_Type (gnat_entity));
5490 save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity),
5492 save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity),
5495 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_task_old)),
5496 TREE_TYPE (gnu_new));
5500 /* GNAT_ASSOC is the front of the Component_Associations of an N_Aggregate.
5501 GNU_TYPE is the GCC type of the corresponding record.
5503 Return a CONSTRUCTOR to build the record. */
5506 assoc_to_constructor (Node_Id gnat_assoc, tree gnu_type)
5508 tree gnu_list, gnu_result;
5510 /* We test for GNU_FIELD being empty in the case where a variant
5511 was the last thing since we don't take things off GNAT_ASSOC in
5512 that case. We check GNAT_ASSOC in case we have a variant, but it
5515 for (gnu_list = NULL_TREE; Present (gnat_assoc);
5516 gnat_assoc = Next (gnat_assoc))
5518 Node_Id gnat_field = First (Choices (gnat_assoc));
5519 tree gnu_field = gnat_to_gnu_field_decl (Entity (gnat_field));
5520 tree gnu_expr = gnat_to_gnu (Expression (gnat_assoc));
5522 /* The expander is supposed to put a single component selector name
5523 in every record component association */
5524 gcc_assert (No (Next (gnat_field)));
5526 /* Ignore fields that have Corresponding_Discriminants since we'll
5527 be setting that field in the parent. */
5528 if (Present (Corresponding_Discriminant (Entity (gnat_field)))
5529 && Is_Tagged_Type (Scope (Entity (gnat_field))))
5532 /* Before assigning a value in an aggregate make sure range checks
5533 are done if required. Then convert to the type of the field. */
5534 if (Do_Range_Check (Expression (gnat_assoc)))
5535 gnu_expr = emit_range_check (gnu_expr, Etype (gnat_field));
5537 gnu_expr = convert (TREE_TYPE (gnu_field), gnu_expr);
5539 /* Add the field and expression to the list. */
5540 gnu_list = tree_cons (gnu_field, gnu_expr, gnu_list);
5543 gnu_result = extract_values (gnu_list, gnu_type);
5545 #ifdef ENABLE_CHECKING
5549 /* Verify every enty in GNU_LIST was used. */
5550 for (gnu_field = gnu_list; gnu_field; gnu_field = TREE_CHAIN (gnu_field))
5551 gcc_assert (TREE_ADDRESSABLE (gnu_field));
5558 /* Builds a possibly nested constructor for array aggregates. GNAT_EXPR
5559 is the first element of an array aggregate. It may itself be an
5560 aggregate (an array or record aggregate). GNU_ARRAY_TYPE is the gnu type
5561 corresponding to the array aggregate. GNAT_COMPONENT_TYPE is the type
5562 of the array component. It is needed for range checking. */
5565 pos_to_constructor (Node_Id gnat_expr, tree gnu_array_type,
5566 Entity_Id gnat_component_type)
5568 tree gnu_expr_list = NULL_TREE;
5569 tree gnu_index = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_array_type));
5572 for ( ; Present (gnat_expr); gnat_expr = Next (gnat_expr))
5574 /* If the expression is itself an array aggregate then first build the
5575 innermost constructor if it is part of our array (multi-dimensional
5578 if (Nkind (gnat_expr) == N_Aggregate
5579 && TREE_CODE (TREE_TYPE (gnu_array_type)) == ARRAY_TYPE
5580 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_array_type)))
5581 gnu_expr = pos_to_constructor (First (Expressions (gnat_expr)),
5582 TREE_TYPE (gnu_array_type),
5583 gnat_component_type);
5586 gnu_expr = gnat_to_gnu (gnat_expr);
5588 /* before assigning the element to the array make sure it is
5590 if (Do_Range_Check (gnat_expr))
5591 gnu_expr = emit_range_check (gnu_expr, gnat_component_type);
5595 = tree_cons (gnu_index, convert (TREE_TYPE (gnu_array_type), gnu_expr),
5598 gnu_index = int_const_binop (PLUS_EXPR, gnu_index, integer_one_node, 0);
5601 return gnat_build_constructor (gnu_array_type, nreverse (gnu_expr_list));
5604 /* Subroutine of assoc_to_constructor: VALUES is a list of field associations,
5605 some of which are from RECORD_TYPE. Return a CONSTRUCTOR consisting
5606 of the associations that are from RECORD_TYPE. If we see an internal
5607 record, make a recursive call to fill it in as well. */
5610 extract_values (tree values, tree record_type)
5612 tree result = NULL_TREE;
5615 for (field = TYPE_FIELDS (record_type); field; field = TREE_CHAIN (field))
5619 /* _Parent is an internal field, but may have values in the aggregate,
5620 so check for values first. */
5621 if ((tem = purpose_member (field, values)))
5623 value = TREE_VALUE (tem);
5624 TREE_ADDRESSABLE (tem) = 1;
5627 else if (DECL_INTERNAL_P (field))
5629 value = extract_values (values, TREE_TYPE (field));
5630 if (TREE_CODE (value) == CONSTRUCTOR
5631 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (value)))
5635 /* If we have a record subtype, the names will match, but not the
5636 actual FIELD_DECLs. */
5637 for (tem = values; tem; tem = TREE_CHAIN (tem))
5638 if (DECL_NAME (TREE_PURPOSE (tem)) == DECL_NAME (field))
5640 value = convert (TREE_TYPE (field), TREE_VALUE (tem));
5641 TREE_ADDRESSABLE (tem) = 1;
5647 result = tree_cons (field, value, result);
5650 return gnat_build_constructor (record_type, nreverse (result));
5653 /* EXP is to be treated as an array or record. Handle the cases when it is
5654 an access object and perform the required dereferences. */
5657 maybe_implicit_deref (tree exp)
5659 /* If the type is a pointer, dereference it. */
5661 if (POINTER_TYPE_P (TREE_TYPE (exp)) || TYPE_FAT_POINTER_P (TREE_TYPE (exp)))
5662 exp = build_unary_op (INDIRECT_REF, NULL_TREE, exp);
5664 /* If we got a padded type, remove it too. */
5665 if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
5666 && TYPE_IS_PADDING_P (TREE_TYPE (exp)))
5667 exp = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (exp))), exp);
5672 /* Protect EXP from multiple evaluation. This may make a SAVE_EXPR. */
5675 protect_multiple_eval (tree exp)
5677 tree type = TREE_TYPE (exp);
5679 /* If this has no side effects, we don't need to do anything. */
5680 if (!TREE_SIDE_EFFECTS (exp))
5683 /* If it is a conversion, protect what's inside the conversion.
5684 Similarly, if we're indirectly referencing something, we only
5685 actually need to protect the address since the data itself can't
5686 change in these situations. */
5687 else if (TREE_CODE (exp) == NON_LVALUE_EXPR
5688 || TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
5689 || TREE_CODE (exp) == VIEW_CONVERT_EXPR
5690 || TREE_CODE (exp) == INDIRECT_REF
5691 || TREE_CODE (exp) == UNCONSTRAINED_ARRAY_REF)
5692 return build1 (TREE_CODE (exp), type,
5693 protect_multiple_eval (TREE_OPERAND (exp, 0)));
5695 /* If EXP is a fat pointer or something that can be placed into a register,
5696 just make a SAVE_EXPR. */
5697 if (TYPE_FAT_POINTER_P (type) || TYPE_MODE (type) != BLKmode)
5698 return save_expr (exp);
5700 /* Otherwise, dereference, protect the address, and re-reference. */
5703 build_unary_op (INDIRECT_REF, type,
5704 save_expr (build_unary_op (ADDR_EXPR,
5705 build_reference_type (type),
5709 /* This is equivalent to stabilize_reference in GCC's tree.c, but we know
5710 how to handle our new nodes and we take an extra argument that says
5711 whether to force evaluation of everything. */
5714 gnat_stabilize_reference (tree ref, bool force)
5716 tree type = TREE_TYPE (ref);
5717 enum tree_code code = TREE_CODE (ref);
5725 /* No action is needed in this case. */
5731 case FIX_TRUNC_EXPR:
5732 case FIX_FLOOR_EXPR:
5733 case FIX_ROUND_EXPR:
5735 case VIEW_CONVERT_EXPR:
5738 = build1 (code, type,
5739 gnat_stabilize_reference (TREE_OPERAND (ref, 0), force));
5743 case UNCONSTRAINED_ARRAY_REF:
5744 result = build1 (code, type,
5745 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 0),
5750 result = build3 (COMPONENT_REF, type,
5751 gnat_stabilize_reference (TREE_OPERAND (ref, 0),
5753 TREE_OPERAND (ref, 1), NULL_TREE);
5757 result = build3 (BIT_FIELD_REF, type,
5758 gnat_stabilize_reference (TREE_OPERAND (ref, 0), force),
5759 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
5761 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 2),
5766 case ARRAY_RANGE_REF:
5767 result = build4 (code, type,
5768 gnat_stabilize_reference (TREE_OPERAND (ref, 0), force),
5769 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
5771 NULL_TREE, NULL_TREE);
5775 result = build2 (COMPOUND_EXPR, type,
5776 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 0),
5778 gnat_stabilize_reference (TREE_OPERAND (ref, 1),
5782 /* If arg isn't a kind of lvalue we recognize, make no change.
5783 Caller should recognize the error for an invalid lvalue. */
5788 return error_mark_node;
5791 TREE_READONLY (result) = TREE_READONLY (ref);
5793 /* TREE_THIS_VOLATILE and TREE_SIDE_EFFECTS attached to the initial
5794 expression may not be sustained across some paths, such as the way via
5795 build1 for INDIRECT_REF. We re-populate those flags here for the general
5796 case, which is consistent with the GCC version of this routine.
5798 Special care should be taken regarding TREE_SIDE_EFFECTS, because some
5799 paths introduce side effects where there was none initially (e.g. calls
5800 to save_expr), and we also want to keep track of that. */
5802 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);
5803 TREE_SIDE_EFFECTS (result) |= TREE_SIDE_EFFECTS (ref);
5808 /* Similar to stabilize_reference_1 in tree.c, but supports an extra
5809 arg to force a SAVE_EXPR for everything. */
5812 gnat_stabilize_reference_1 (tree e, bool force)
5814 enum tree_code code = TREE_CODE (e);
5815 tree type = TREE_TYPE (e);
5818 /* We cannot ignore const expressions because it might be a reference
5819 to a const array but whose index contains side-effects. But we can
5820 ignore things that are actual constant or that already have been
5821 handled by this function. */
5823 if (TREE_CONSTANT (e) || code == SAVE_EXPR)
5826 switch (TREE_CODE_CLASS (code))
5828 case tcc_exceptional:
5830 case tcc_declaration:
5831 case tcc_comparison:
5833 case tcc_expression:
5835 /* If this is a COMPONENT_REF of a fat pointer, save the entire
5836 fat pointer. This may be more efficient, but will also allow
5837 us to more easily find the match for the PLACEHOLDER_EXPR. */
5838 if (code == COMPONENT_REF
5839 && TYPE_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (e, 0))))
5840 result = build3 (COMPONENT_REF, type,
5841 gnat_stabilize_reference_1 (TREE_OPERAND (e, 0),
5843 TREE_OPERAND (e, 1), TREE_OPERAND (e, 2));
5844 else if (TREE_SIDE_EFFECTS (e) || force)
5845 return save_expr (e);
5851 /* Constants need no processing. In fact, we should never reach
5856 /* Recursively stabilize each operand. */
5857 result = build2 (code, type,
5858 gnat_stabilize_reference_1 (TREE_OPERAND (e, 0), force),
5859 gnat_stabilize_reference_1 (TREE_OPERAND (e, 1),
5864 /* Recursively stabilize each operand. */
5865 result = build1 (code, type,
5866 gnat_stabilize_reference_1 (TREE_OPERAND (e, 0),
5874 TREE_READONLY (result) = TREE_READONLY (e);
5876 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);
5877 TREE_SIDE_EFFECTS (result) |= TREE_SIDE_EFFECTS (e);
5881 /* Build a global constructor or destructor function. METHOD_TYPE gives
5882 the type of the function and CDTORS points to the list of constructor
5883 or destructor functions to be invoked. FIXME: Migrate into cgraph. */
5886 build_global_cdtor (int method_type, tree *cdtors)
5890 for (; *cdtors; *cdtors = TREE_CHAIN (*cdtors))
5892 tree fn = TREE_VALUE (*cdtors);
5893 tree fntype = TREE_TYPE (fn);
5894 tree fnaddr = build1 (ADDR_EXPR, build_pointer_type (fntype), fn);
5895 tree fncall = build3 (CALL_EXPR, TREE_TYPE (fntype), fnaddr, NULL_TREE,
5897 append_to_statement_list (fncall, &body);
5900 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
5903 extern char *__gnat_to_canonical_file_spec (char *);
5905 /* Convert Sloc into *LOCUS (a location_t). Return true if this Sloc
5906 corresponds to a source code location and false if it doesn't. In the
5907 latter case, we don't update *LOCUS. We also set the Gigi global variable
5908 REF_FILENAME to the reference file name as given by sinput (i.e no
5912 Sloc_to_locus (Source_Ptr Sloc, location_t *locus)
5914 /* If node not from source code, ignore. */
5918 /* Use the identifier table to make a hashed, permanent copy of the filename,
5919 since the name table gets reallocated after Gigi returns but before all
5920 the debugging information is output. The __gnat_to_canonical_file_spec
5921 call translates filenames from pragmas Source_Reference that contain host
5922 style syntax not understood by gdb. */
5924 = IDENTIFIER_POINTER
5926 (__gnat_to_canonical_file_spec
5927 (Get_Name_String (Full_Debug_Name (Get_Source_File_Index (Sloc))))));
5929 locus->line = Get_Logical_Line_Number (Sloc);
5932 = IDENTIFIER_POINTER
5934 (Get_Name_String (Debug_Source_Name (Get_Source_File_Index (Sloc)))));;
5939 /* Similar to annotate_with_locus, but start with the Sloc of GNAT_NODE and
5940 don't do anything if it doesn't correspond to a source location. */
5943 annotate_with_node (tree node, Node_Id gnat_node)
5947 if (!Sloc_to_locus (Sloc (gnat_node), &locus))
5950 annotate_with_locus (node, locus);
5953 /* Post an error message. MSG is the error message, properly annotated.
5954 NODE is the node at which to post the error and the node to use for the
5955 "&" substitution. */
5958 post_error (const char *msg, Node_Id node)
5960 String_Template temp;
5963 temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
5964 fp.Array = msg, fp.Bounds = &temp;
5966 Error_Msg_N (fp, node);
5969 /* Similar, but NODE is the node at which to post the error and ENT
5970 is the node to use for the "&" substitution. */
5973 post_error_ne (const char *msg, Node_Id node, Entity_Id ent)
5975 String_Template temp;
5978 temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
5979 fp.Array = msg, fp.Bounds = &temp;
5981 Error_Msg_NE (fp, node, ent);
5984 /* Similar, but NODE is the node at which to post the error, ENT is the node
5985 to use for the "&" substitution, and N is the number to use for the ^. */
5988 post_error_ne_num (const char *msg, Node_Id node, Entity_Id ent, int n)
5990 String_Template temp;
5993 temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
5994 fp.Array = msg, fp.Bounds = &temp;
5995 Error_Msg_Uint_1 = UI_From_Int (n);
5998 Error_Msg_NE (fp, node, ent);
6001 /* Similar to post_error_ne_num, but T is a GCC tree representing the
6002 number to write. If the tree represents a constant that fits within
6003 a host integer, the text inside curly brackets in MSG will be output
6004 (presumably including a '^'). Otherwise that text will not be output
6005 and the text inside square brackets will be output instead. */
6008 post_error_ne_tree (const char *msg, Node_Id node, Entity_Id ent, tree t)
6010 char *newmsg = alloca (strlen (msg) + 1);
6011 String_Template temp = {1, 0};
6013 char start_yes, end_yes, start_no, end_no;
6017 fp.Array = newmsg, fp.Bounds = &temp;
6019 if (host_integerp (t, 1)
6020 #if HOST_BITS_PER_WIDE_INT > HOST_BITS_PER_INT
6023 (t, (((unsigned HOST_WIDE_INT) 1 << (HOST_BITS_PER_INT - 1)) - 1)) < 0
6027 Error_Msg_Uint_1 = UI_From_Int (tree_low_cst (t, 1));
6028 start_yes = '{', end_yes = '}', start_no = '[', end_no = ']';
6031 start_yes = '[', end_yes = ']', start_no = '{', end_no = '}';
6033 for (p = msg, q = newmsg; *p; p++)
6035 if (*p == start_yes)
6036 for (p++; *p != end_yes; p++)
6038 else if (*p == start_no)
6039 for (p++; *p != end_no; p++)
6047 temp.High_Bound = strlen (newmsg);
6049 Error_Msg_NE (fp, node, ent);
6052 /* Similar to post_error_ne_tree, except that NUM is a second
6053 integer to write in the message. */
6056 post_error_ne_tree_2 (const char *msg,
6062 Error_Msg_Uint_2 = UI_From_Int (num);
6063 post_error_ne_tree (msg, node, ent, t);
6066 /* Initialize the table that maps GNAT codes to GCC codes for simple
6067 binary and unary operations. */
6070 init_code_table (void)
6072 gnu_codes[N_And_Then] = TRUTH_ANDIF_EXPR;
6073 gnu_codes[N_Or_Else] = TRUTH_ORIF_EXPR;
6075 gnu_codes[N_Op_And] = TRUTH_AND_EXPR;
6076 gnu_codes[N_Op_Or] = TRUTH_OR_EXPR;
6077 gnu_codes[N_Op_Xor] = TRUTH_XOR_EXPR;
6078 gnu_codes[N_Op_Eq] = EQ_EXPR;
6079 gnu_codes[N_Op_Ne] = NE_EXPR;
6080 gnu_codes[N_Op_Lt] = LT_EXPR;
6081 gnu_codes[N_Op_Le] = LE_EXPR;
6082 gnu_codes[N_Op_Gt] = GT_EXPR;
6083 gnu_codes[N_Op_Ge] = GE_EXPR;
6084 gnu_codes[N_Op_Add] = PLUS_EXPR;
6085 gnu_codes[N_Op_Subtract] = MINUS_EXPR;
6086 gnu_codes[N_Op_Multiply] = MULT_EXPR;
6087 gnu_codes[N_Op_Mod] = FLOOR_MOD_EXPR;
6088 gnu_codes[N_Op_Rem] = TRUNC_MOD_EXPR;
6089 gnu_codes[N_Op_Minus] = NEGATE_EXPR;
6090 gnu_codes[N_Op_Abs] = ABS_EXPR;
6091 gnu_codes[N_Op_Not] = TRUTH_NOT_EXPR;
6092 gnu_codes[N_Op_Rotate_Left] = LROTATE_EXPR;
6093 gnu_codes[N_Op_Rotate_Right] = RROTATE_EXPR;
6094 gnu_codes[N_Op_Shift_Left] = LSHIFT_EXPR;
6095 gnu_codes[N_Op_Shift_Right] = RSHIFT_EXPR;
6096 gnu_codes[N_Op_Shift_Right_Arithmetic] = RSHIFT_EXPR;
6099 #include "gt-ada-trans.h"