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);
1691 /* Account for next statement just below. */
1692 gnu_name = gnu_actual;
1696 /* If this was a procedure call, we may not have removed any padding.
1697 So do it here for the part we will use as an input, if any. */
1698 gnu_actual = gnu_name;
1699 if (Ekind (gnat_formal) != E_Out_Parameter
1700 && TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
1701 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual)))
1702 gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)),
1705 /* Unless this is an In parameter, we must remove any LJM building
1707 if (Ekind (gnat_formal) != E_In_Parameter
1708 && TREE_CODE (gnu_name) == CONSTRUCTOR
1709 && TREE_CODE (TREE_TYPE (gnu_name)) == RECORD_TYPE
1710 && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (gnu_name)))
1711 gnu_name = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_name))),
1714 if (Ekind (gnat_formal) != E_Out_Parameter
1715 && !unchecked_convert_p
1716 && Do_Range_Check (gnat_actual))
1717 gnu_actual = emit_range_check (gnu_actual, Etype (gnat_formal));
1719 /* Do any needed conversions. We need only check for unchecked
1720 conversion since normal conversions will be handled by just
1721 converting to the formal type. */
1722 if (unchecked_convert_p)
1725 = unchecked_convert (gnat_to_gnu_type (Etype (gnat_actual)),
1727 (Nkind (gnat_actual)
1728 == N_Unchecked_Type_Conversion)
1729 && No_Truncation (gnat_actual));
1731 /* One we've done the unchecked conversion, we still must ensure that
1732 the object is in range of the formal's type. */
1733 if (Ekind (gnat_formal) != E_Out_Parameter
1734 && Do_Range_Check (gnat_actual))
1735 gnu_actual = emit_range_check (gnu_actual,
1736 Etype (gnat_formal));
1738 else if (TREE_CODE (gnu_actual) != SAVE_EXPR)
1739 /* We may have suppressed a conversion to the Etype of the actual since
1740 the parent is a procedure call. So add the conversion here. */
1741 gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)),
1744 /* If we have not saved a GCC object for the formal, it means it is an
1745 OUT parameter not passed by reference and that does not need to be
1746 copied in. Otherwise, look at the PARM_DECL to see if it is passed by
1749 && TREE_CODE (gnu_formal) == PARM_DECL && DECL_BY_REF_P (gnu_formal))
1751 if (Ekind (gnat_formal) != E_In_Parameter)
1753 gnu_actual = gnu_name;
1755 /* If we have a padded type, be sure we've removed padding. */
1756 if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
1757 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual))
1758 && TREE_CODE (gnu_actual) != SAVE_EXPR)
1759 gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)),
1762 /* If we have the constructed subtype of an aliased object
1763 with an unconstrained nominal subtype, the type of the
1764 actual includes the template, although it is formally
1765 constrained. So we need to convert it back to the real
1766 constructed subtype to retrieve the constrained part
1767 and takes its address. */
1768 if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
1769 && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (gnu_actual))
1770 && TREE_CODE (gnu_actual) != SAVE_EXPR
1771 && Is_Constr_Subt_For_UN_Aliased (Etype (gnat_actual))
1772 && Is_Array_Type (Etype (gnat_actual)))
1773 gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)),
1777 /* Otherwise, if we have a non-addressable COMPONENT_REF of a
1778 variable-size type see if it's doing a unpadding operation. If
1779 so, remove that operation since we have no way of allocating the
1780 required temporary. */
1781 if (TREE_CODE (gnu_actual) == COMPONENT_REF
1782 && !TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual)))
1783 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_actual, 0)))
1785 && TYPE_IS_PADDING_P (TREE_TYPE
1786 (TREE_OPERAND (gnu_actual, 0)))
1787 && !addressable_p (gnu_actual))
1788 gnu_actual = TREE_OPERAND (gnu_actual, 0);
1790 /* The symmetry of the paths to the type of an entity is broken here
1791 since arguments don't know that they will be passed by ref. */
1792 gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal));
1793 gnu_actual = build_unary_op (ADDR_EXPR, gnu_formal_type, gnu_actual);
1795 else if (gnu_formal && TREE_CODE (gnu_formal) == PARM_DECL
1796 && DECL_BY_COMPONENT_PTR_P (gnu_formal))
1798 gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal));
1799 gnu_actual = maybe_implicit_deref (gnu_actual);
1800 gnu_actual = maybe_unconstrained_array (gnu_actual);
1802 if (TREE_CODE (gnu_formal_type) == RECORD_TYPE
1803 && TYPE_IS_PADDING_P (gnu_formal_type))
1805 gnu_formal_type = TREE_TYPE (TYPE_FIELDS (gnu_formal_type));
1806 gnu_actual = convert (gnu_formal_type, gnu_actual);
1809 /* Take the address of the object and convert to the proper pointer
1810 type. We'd like to actually compute the address of the beginning
1811 of the array using an ADDR_EXPR of an ARRAY_REF, but there's a
1812 possibility that the ARRAY_REF might return a constant and we'd be
1813 getting the wrong address. Neither approach is exactly correct,
1814 but this is the most likely to work in all cases. */
1815 gnu_actual = convert (gnu_formal_type,
1816 build_unary_op (ADDR_EXPR, NULL_TREE,
1819 else if (gnu_formal && TREE_CODE (gnu_formal) == PARM_DECL
1820 && DECL_BY_DESCRIPTOR_P (gnu_formal))
1822 /* If arg is 'Null_Parameter, pass zero descriptor. */
1823 if ((TREE_CODE (gnu_actual) == INDIRECT_REF
1824 || TREE_CODE (gnu_actual) == UNCONSTRAINED_ARRAY_REF)
1825 && TREE_PRIVATE (gnu_actual))
1826 gnu_actual = convert (DECL_ARG_TYPE (get_gnu_tree (gnat_formal)),
1829 gnu_actual = build_unary_op (ADDR_EXPR, NULL_TREE,
1830 fill_vms_descriptor (gnu_actual,
1835 tree gnu_actual_size = TYPE_SIZE (TREE_TYPE (gnu_actual));
1837 if (Ekind (gnat_formal) != E_In_Parameter)
1838 gnu_name_list = tree_cons (NULL_TREE, gnu_name, gnu_name_list);
1840 if (!gnu_formal || TREE_CODE (gnu_formal) != PARM_DECL)
1843 /* If this is 'Null_Parameter, pass a zero even though we are
1844 dereferencing it. */
1845 else if (TREE_CODE (gnu_actual) == INDIRECT_REF
1846 && TREE_PRIVATE (gnu_actual)
1847 && host_integerp (gnu_actual_size, 1)
1848 && 0 >= compare_tree_int (gnu_actual_size,
1851 = unchecked_convert (DECL_ARG_TYPE (gnu_formal),
1852 convert (gnat_type_for_size
1853 (tree_low_cst (gnu_actual_size, 1),
1858 gnu_actual = convert (DECL_ARG_TYPE (gnu_formal), gnu_actual);
1861 gnu_actual_list = tree_cons (NULL_TREE, gnu_actual, gnu_actual_list);
1864 gnu_subprog_call = build3 (CALL_EXPR, TREE_TYPE (gnu_subprog_type),
1865 gnu_subprog_addr, nreverse (gnu_actual_list),
1868 /* If we return by passing a target, we emit the call and return the target
1870 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
1872 add_stmt_with_node (gnu_subprog_call, gnat_node);
1874 = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (gnu_subprog_type)));
1875 return unchecked_convert (*gnu_result_type_p, gnu_target, false);
1878 /* If it is a function call, the result is the call expression unless
1879 a target is specified, in which case we copy the result into the target
1880 and return the assignment statement. */
1881 else if (Nkind (gnat_node) == N_Function_Call)
1883 gnu_result = gnu_subprog_call;
1885 /* If the function returns an unconstrained array or by reference,
1886 we have to de-dereference the pointer. */
1887 if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type)
1888 || TYPE_RETURNS_BY_REF_P (gnu_subprog_type))
1889 gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result);
1892 gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE,
1893 gnu_target, gnu_result);
1895 *gnu_result_type_p = get_unpadded_type (Etype (gnat_node));
1900 /* If this is the case where the GNAT tree contains a procedure call
1901 but the Ada procedure has copy in copy out parameters, the special
1902 parameter passing mechanism must be used. */
1903 else if (TYPE_CI_CO_LIST (gnu_subprog_type) != NULL_TREE)
1905 /* List of FIELD_DECLs associated with the PARM_DECLs of the copy
1906 in copy out parameters. */
1907 tree scalar_return_list = TYPE_CI_CO_LIST (gnu_subprog_type);
1908 int length = list_length (scalar_return_list);
1914 gnu_subprog_call = save_expr (gnu_subprog_call);
1915 gnu_name_list = nreverse (gnu_name_list);
1917 /* If any of the names had side-effects, ensure they are all
1918 evaluated before the call. */
1919 for (gnu_name = gnu_name_list; gnu_name;
1920 gnu_name = TREE_CHAIN (gnu_name))
1921 if (TREE_SIDE_EFFECTS (TREE_VALUE (gnu_name)))
1922 append_to_statement_list (TREE_VALUE (gnu_name),
1926 if (Nkind (Name (gnat_node)) == N_Explicit_Dereference)
1927 gnat_formal = First_Formal (Etype (Name (gnat_node)));
1929 gnat_formal = First_Formal (Entity (Name (gnat_node)));
1931 for (gnat_actual = First_Actual (gnat_node);
1932 Present (gnat_actual);
1933 gnat_formal = Next_Formal_With_Extras (gnat_formal),
1934 gnat_actual = Next_Actual (gnat_actual))
1935 /* If we are dealing with a copy in copy out parameter, we must
1936 retrieve its value from the record returned in the call. */
1937 if (!(present_gnu_tree (gnat_formal)
1938 && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
1939 && (DECL_BY_REF_P (get_gnu_tree (gnat_formal))
1940 || (TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
1941 && ((DECL_BY_COMPONENT_PTR_P (get_gnu_tree (gnat_formal))
1942 || (DECL_BY_DESCRIPTOR_P
1943 (get_gnu_tree (gnat_formal))))))))
1944 && Ekind (gnat_formal) != E_In_Parameter)
1946 /* Get the value to assign to this OUT or IN OUT parameter. It is
1947 either the result of the function if there is only a single such
1948 parameter or the appropriate field from the record returned. */
1950 = length == 1 ? gnu_subprog_call
1951 : build_component_ref (gnu_subprog_call, NULL_TREE,
1952 TREE_PURPOSE (scalar_return_list),
1954 bool unchecked_conversion = (Nkind (gnat_actual)
1955 == N_Unchecked_Type_Conversion);
1956 /* If the actual is a conversion, get the inner expression, which
1957 will be the real destination, and convert the result to the
1958 type of the actual parameter. */
1960 = maybe_unconstrained_array (TREE_VALUE (gnu_name_list));
1962 /* If the result is a padded type, remove the padding. */
1963 if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
1964 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result)))
1965 gnu_result = convert (TREE_TYPE (TYPE_FIELDS
1966 (TREE_TYPE (gnu_result))),
1969 /* If the result is a type conversion, do it. */
1970 if (Nkind (gnat_actual) == N_Type_Conversion)
1972 = convert_with_check
1973 (Etype (Expression (gnat_actual)), gnu_result,
1974 Do_Overflow_Check (gnat_actual),
1975 Do_Range_Check (Expression (gnat_actual)),
1976 Float_Truncate (gnat_actual));
1978 else if (unchecked_conversion)
1979 gnu_result = unchecked_convert (TREE_TYPE (gnu_actual),
1981 No_Truncation (gnat_actual));
1984 if (Do_Range_Check (gnat_actual))
1985 gnu_result = emit_range_check (gnu_result,
1986 Etype (gnat_actual));
1988 if (!(!TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual)))
1989 && TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_result)))))
1990 gnu_result = convert (TREE_TYPE (gnu_actual), gnu_result);
1993 gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE,
1994 gnu_actual, gnu_result);
1995 annotate_with_node (gnu_result, gnat_actual);
1996 append_to_statement_list (gnu_result, &gnu_before_list);
1997 scalar_return_list = TREE_CHAIN (scalar_return_list);
1998 gnu_name_list = TREE_CHAIN (gnu_name_list);
2003 annotate_with_node (gnu_subprog_call, gnat_node);
2004 append_to_statement_list (gnu_subprog_call, &gnu_before_list);
2007 append_to_statement_list (gnu_after_list, &gnu_before_list);
2008 return gnu_before_list;
2011 /* Subroutine of gnat_to_gnu to translate gnat_node, an
2012 N_Handled_Sequence_Of_Statements, to a GCC tree, which is returned. */
2015 Handled_Sequence_Of_Statements_to_gnu (Node_Id gnat_node)
2017 tree gnu_jmpsave_decl = NULL_TREE;
2018 tree gnu_jmpbuf_decl = NULL_TREE;
2019 /* If just annotating, ignore all EH and cleanups. */
2020 bool gcc_zcx = (!type_annotate_only
2021 && Present (Exception_Handlers (gnat_node))
2022 && Exception_Mechanism == Back_End_Exceptions);
2024 = (!type_annotate_only && Present (Exception_Handlers (gnat_node))
2025 && Exception_Mechanism == Setjmp_Longjmp);
2026 bool at_end = !type_annotate_only && Present (At_End_Proc (gnat_node));
2027 bool binding_for_block = (at_end || gcc_zcx || setjmp_longjmp);
2028 tree gnu_inner_block; /* The statement(s) for the block itself. */
2033 /* The GCC exception handling mechanism can handle both ZCX and SJLJ schemes
2034 and we have our own SJLJ mechanism. To call the GCC mechanism, we call
2035 add_cleanup, and when we leave the binding, end_stmt_group will create
2036 the TRY_FINALLY_EXPR.
2038 ??? The region level calls down there have been specifically put in place
2039 for a ZCX context and currently the order in which things are emitted
2040 (region/handlers) is different from the SJLJ case. Instead of putting
2041 other calls with different conditions at other places for the SJLJ case,
2042 it seems cleaner to reorder things for the SJLJ case and generalize the
2043 condition to make it not ZCX specific.
2045 If there are any exceptions or cleanup processing involved, we need an
2046 outer statement group (for Setjmp_Longjmp) and binding level. */
2047 if (binding_for_block)
2049 start_stmt_group ();
2053 /* If we are to call a function when exiting this block add a cleanup
2054 to the binding level we made above. */
2056 add_cleanup (build_call_0_expr (gnat_to_gnu (At_End_Proc (gnat_node))));
2058 /* If using setjmp_longjmp, make the variables for the setjmp buffer and save
2059 area for address of previous buffer. Do this first since we need to have
2060 the setjmp buf known for any decls in this block. */
2063 gnu_jmpsave_decl = create_var_decl (get_identifier ("JMPBUF_SAVE"),
2064 NULL_TREE, jmpbuf_ptr_type,
2065 build_call_0_expr (get_jmpbuf_decl),
2066 false, false, false, false, NULL,
2068 gnu_jmpbuf_decl = create_var_decl (get_identifier ("JMP_BUF"),
2069 NULL_TREE, jmpbuf_type,
2070 NULL_TREE, false, false, false, false,
2073 set_block_jmpbuf_decl (gnu_jmpbuf_decl);
2075 /* When we exit this block, restore the saved value. */
2076 add_cleanup (build_call_1_expr (set_jmpbuf_decl, gnu_jmpsave_decl));
2079 /* Now build the tree for the declarations and statements inside this block.
2080 If this is SJLJ, set our jmp_buf as the current buffer. */
2081 start_stmt_group ();
2084 add_stmt (build_call_1_expr (set_jmpbuf_decl,
2085 build_unary_op (ADDR_EXPR, NULL_TREE,
2088 if (Present (First_Real_Statement (gnat_node)))
2089 process_decls (Statements (gnat_node), Empty,
2090 First_Real_Statement (gnat_node), true, true);
2092 /* Generate code for each statement in the block. */
2093 for (gnat_temp = (Present (First_Real_Statement (gnat_node))
2094 ? First_Real_Statement (gnat_node)
2095 : First (Statements (gnat_node)));
2096 Present (gnat_temp); gnat_temp = Next (gnat_temp))
2097 add_stmt (gnat_to_gnu (gnat_temp));
2098 gnu_inner_block = end_stmt_group ();
2100 /* Now generate code for the two exception models, if either is relevant for
2104 tree *gnu_else_ptr = 0;
2107 /* Make a binding level for the exception handling declarations and code
2108 and set up gnu_except_ptr_stack for the handlers to use. */
2109 start_stmt_group ();
2112 push_stack (&gnu_except_ptr_stack, NULL_TREE,
2113 create_var_decl (get_identifier ("EXCEPT_PTR"),
2115 build_pointer_type (except_type_node),
2116 build_call_0_expr (get_excptr_decl), false,
2117 false, false, false, NULL, gnat_node));
2119 /* Generate code for each handler. The N_Exception_Handler case does the
2120 real work and returns a COND_EXPR for each handler, which we chain
2122 for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node));
2123 Present (gnat_temp); gnat_temp = Next_Non_Pragma (gnat_temp))
2125 gnu_expr = gnat_to_gnu (gnat_temp);
2127 /* If this is the first one, set it as the outer one. Otherwise,
2128 point the "else" part of the previous handler to us. Then point
2129 to our "else" part. */
2131 add_stmt (gnu_expr);
2133 *gnu_else_ptr = gnu_expr;
2135 gnu_else_ptr = &COND_EXPR_ELSE (gnu_expr);
2138 /* If none of the exception handlers did anything, re-raise but do not
2140 gnu_expr = build_call_1_expr (raise_nodefer_decl,
2141 TREE_VALUE (gnu_except_ptr_stack));
2142 annotate_with_node (gnu_expr, gnat_node);
2145 *gnu_else_ptr = gnu_expr;
2147 add_stmt (gnu_expr);
2149 /* End the binding level dedicated to the exception handlers and get the
2150 whole statement group. */
2151 pop_stack (&gnu_except_ptr_stack);
2153 gnu_handler = end_stmt_group ();
2155 /* If the setjmp returns 1, we restore our incoming longjmp value and
2156 then check the handlers. */
2157 start_stmt_group ();
2158 add_stmt_with_node (build_call_1_expr (set_jmpbuf_decl,
2161 add_stmt (gnu_handler);
2162 gnu_handler = end_stmt_group ();
2164 /* This block is now "if (setjmp) ... <handlers> else <block>". */
2165 gnu_result = build3 (COND_EXPR, void_type_node,
2168 build_unary_op (ADDR_EXPR, NULL_TREE,
2170 gnu_handler, gnu_inner_block);
2176 /* First make a block containing the handlers. */
2177 start_stmt_group ();
2178 for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node));
2179 Present (gnat_temp);
2180 gnat_temp = Next_Non_Pragma (gnat_temp))
2181 add_stmt (gnat_to_gnu (gnat_temp));
2182 gnu_handlers = end_stmt_group ();
2184 /* Now make the TRY_CATCH_EXPR for the block. */
2185 gnu_result = build2 (TRY_CATCH_EXPR, void_type_node,
2186 gnu_inner_block, gnu_handlers);
2189 gnu_result = gnu_inner_block;
2191 /* Now close our outer block, if we had to make one. */
2192 if (binding_for_block)
2194 add_stmt (gnu_result);
2196 gnu_result = end_stmt_group ();
2202 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler,
2203 to a GCC tree, which is returned. This is the variant for Setjmp_Longjmp
2204 exception handling. */
2207 Exception_Handler_to_gnu_sjlj (Node_Id gnat_node)
2209 /* Unless this is "Others" or the special "Non-Ada" exception for Ada, make
2210 an "if" statement to select the proper exceptions. For "Others", exclude
2211 exceptions where Handled_By_Others is nonzero unless the All_Others flag
2212 is set. For "Non-ada", accept an exception if "Lang" is 'V'. */
2213 tree gnu_choice = integer_zero_node;
2214 tree gnu_body = build_stmt_group (Statements (gnat_node), false);
2217 for (gnat_temp = First (Exception_Choices (gnat_node));
2218 gnat_temp; gnat_temp = Next (gnat_temp))
2222 if (Nkind (gnat_temp) == N_Others_Choice)
2224 if (All_Others (gnat_temp))
2225 this_choice = integer_one_node;
2229 (EQ_EXPR, integer_type_node,
2234 (INDIRECT_REF, NULL_TREE,
2235 TREE_VALUE (gnu_except_ptr_stack)),
2236 get_identifier ("not_handled_by_others"), NULL_TREE,
2241 else if (Nkind (gnat_temp) == N_Identifier
2242 || Nkind (gnat_temp) == N_Expanded_Name)
2244 Entity_Id gnat_ex_id = Entity (gnat_temp);
2247 /* Exception may be a renaming. Recover original exception which is
2248 the one elaborated and registered. */
2249 if (Present (Renamed_Object (gnat_ex_id)))
2250 gnat_ex_id = Renamed_Object (gnat_ex_id);
2252 gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, 0);
2256 (EQ_EXPR, integer_type_node, TREE_VALUE (gnu_except_ptr_stack),
2257 convert (TREE_TYPE (TREE_VALUE (gnu_except_ptr_stack)),
2258 build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr)));
2260 /* If this is the distinguished exception "Non_Ada_Error" (and we are
2261 in VMS mode), also allow a non-Ada exception (a VMS condition) t
2263 if (Is_Non_Ada_Error (Entity (gnat_temp)))
2266 = build_component_ref
2267 (build_unary_op (INDIRECT_REF, NULL_TREE,
2268 TREE_VALUE (gnu_except_ptr_stack)),
2269 get_identifier ("lang"), NULL_TREE, false);
2273 (TRUTH_ORIF_EXPR, integer_type_node,
2274 build_binary_op (EQ_EXPR, integer_type_node, gnu_comp,
2275 build_int_cst (TREE_TYPE (gnu_comp), 'V')),
2282 gnu_choice = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
2283 gnu_choice, this_choice);
2286 return build3 (COND_EXPR, void_type_node, gnu_choice, gnu_body, NULL_TREE);
2289 /* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler,
2290 to a GCC tree, which is returned. This is the variant for ZCX. */
2293 Exception_Handler_to_gnu_zcx (Node_Id gnat_node)
2295 tree gnu_etypes_list = NULL_TREE;
2298 tree gnu_current_exc_ptr;
2299 tree gnu_incoming_exc_ptr;
2302 /* We build a TREE_LIST of nodes representing what exception types this
2303 handler can catch, with special cases for others and all others cases.
2305 Each exception type is actually identified by a pointer to the exception
2306 id, or to a dummy object for "others" and "all others".
2308 Care should be taken to ensure that the control flow impact of "others"
2309 and "all others" is known to GCC. lang_eh_type_covers is doing the trick
2311 for (gnat_temp = First (Exception_Choices (gnat_node));
2312 gnat_temp; gnat_temp = Next (gnat_temp))
2314 if (Nkind (gnat_temp) == N_Others_Choice)
2317 = All_Others (gnat_temp) ? all_others_decl : others_decl;
2320 = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr);
2322 else if (Nkind (gnat_temp) == N_Identifier
2323 || Nkind (gnat_temp) == N_Expanded_Name)
2325 Entity_Id gnat_ex_id = Entity (gnat_temp);
2327 /* Exception may be a renaming. Recover original exception which is
2328 the one elaborated and registered. */
2329 if (Present (Renamed_Object (gnat_ex_id)))
2330 gnat_ex_id = Renamed_Object (gnat_ex_id);
2332 gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, 0);
2333 gnu_etype = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr);
2335 /* The Non_Ada_Error case for VMS exceptions is handled
2336 by the personality routine. */
2341 /* The GCC interface expects NULL to be passed for catch all handlers, so
2342 it would be quite tempting to set gnu_etypes_list to NULL if gnu_etype
2343 is integer_zero_node. It would not work, however, because GCC's
2344 notion of "catch all" is stronger than our notion of "others". Until
2345 we correctly use the cleanup interface as well, doing that would
2346 prevent the "all others" handlers from being seen, because nothing
2347 can be caught beyond a catch all from GCC's point of view. */
2348 gnu_etypes_list = tree_cons (NULL_TREE, gnu_etype, gnu_etypes_list);
2351 start_stmt_group ();
2354 /* Expand a call to the begin_handler hook at the beginning of the handler,
2355 and arrange for a call to the end_handler hook to occur on every possible
2358 The hooks expect a pointer to the low level occurrence. This is required
2359 for our stack management scheme because a raise inside the handler pushes
2360 a new occurrence on top of the stack, which means that this top does not
2361 necessarily match the occurrence this handler was dealing with.
2363 The EXC_PTR_EXPR object references the exception occurrence being
2364 propagated. Upon handler entry, this is the exception for which the
2365 handler is triggered. This might not be the case upon handler exit,
2366 however, as we might have a new occurrence propagated by the handler's
2367 body, and the end_handler hook called as a cleanup in this context.
2369 We use a local variable to retrieve the incoming value at handler entry
2370 time, and reuse it to feed the end_handler hook's argument at exit. */
2371 gnu_current_exc_ptr = build0 (EXC_PTR_EXPR, ptr_type_node);
2372 gnu_incoming_exc_ptr = create_var_decl (get_identifier ("EXPTR"), NULL_TREE,
2373 ptr_type_node, gnu_current_exc_ptr,
2374 false, false, false, false, NULL,
2377 add_stmt_with_node (build_call_1_expr (begin_handler_decl,
2378 gnu_incoming_exc_ptr),
2380 add_cleanup (build_call_1_expr (end_handler_decl, gnu_incoming_exc_ptr));
2381 add_stmt_list (Statements (gnat_node));
2384 return build2 (CATCH_EXPR, void_type_node, gnu_etypes_list,
2388 /* Subroutine of gnat_to_gnu to generate code for an N_Compilation unit. */
2391 Compilation_Unit_to_gnu (Node_Id gnat_node)
2393 /* Make the decl for the elaboration procedure. */
2394 bool body_p = (Defining_Entity (Unit (gnat_node)),
2395 Nkind (Unit (gnat_node)) == N_Package_Body
2396 || Nkind (Unit (gnat_node)) == N_Subprogram_Body);
2397 Entity_Id gnat_unit_entity = Defining_Entity (Unit (gnat_node));
2398 tree gnu_elab_proc_decl
2399 = create_subprog_decl
2400 (create_concat_name (gnat_unit_entity,
2401 body_p ? "elabb" : "elabs"),
2402 NULL_TREE, void_ftype, NULL_TREE, false, true, false, NULL,
2404 struct elab_info *info;
2406 push_stack (&gnu_elab_proc_stack, NULL_TREE, gnu_elab_proc_decl);
2408 DECL_ELABORATION_PROC_P (gnu_elab_proc_decl) = 1;
2409 allocate_struct_function (gnu_elab_proc_decl);
2410 Sloc_to_locus (Sloc (gnat_unit_entity), &cfun->function_end_locus);
2413 /* For a body, first process the spec if there is one. */
2414 if (Nkind (Unit (gnat_node)) == N_Package_Body
2415 || (Nkind (Unit (gnat_node)) == N_Subprogram_Body
2416 && !Acts_As_Spec (gnat_node)))
2417 add_stmt (gnat_to_gnu (Library_Unit (gnat_node)));
2419 process_inlined_subprograms (gnat_node);
2421 if (type_annotate_only)
2423 elaborate_all_entities (gnat_node);
2425 if (Nkind (Unit (gnat_node)) == N_Subprogram_Declaration
2426 || Nkind (Unit (gnat_node)) == N_Generic_Package_Declaration
2427 || Nkind (Unit (gnat_node)) == N_Generic_Subprogram_Declaration)
2431 process_decls (Declarations (Aux_Decls_Node (gnat_node)), Empty, Empty,
2433 add_stmt (gnat_to_gnu (Unit (gnat_node)));
2435 /* Process any pragmas and actions following the unit. */
2436 add_stmt_list (Pragmas_After (Aux_Decls_Node (gnat_node)));
2437 add_stmt_list (Actions (Aux_Decls_Node (gnat_node)));
2439 /* Save away what we've made so far and record this potential elaboration
2441 info = (struct elab_info *) ggc_alloc (sizeof (struct elab_info));
2442 set_current_block_context (gnu_elab_proc_decl);
2444 DECL_SAVED_TREE (gnu_elab_proc_decl) = end_stmt_group ();
2445 info->next = elab_info_list;
2446 info->elab_proc = gnu_elab_proc_decl;
2447 info->gnat_node = gnat_node;
2448 elab_info_list = info;
2450 /* Generate elaboration code for this unit, if necessary, and say whether
2452 pop_stack (&gnu_elab_proc_stack);
2454 /* Generate functions to call static constructors and destructors
2455 for targets that do not support .ctors/.dtors sections. These
2456 functions have magic names which are detected by collect2. */
2458 build_global_cdtor ('I', &static_ctors);
2461 build_global_cdtor ('D', &static_dtors);
2464 /* This function is the driver of the GNAT to GCC tree transformation
2465 process. It is the entry point of the tree transformer. GNAT_NODE is the
2466 root of some GNAT tree. Return the root of the corresponding GCC tree.
2467 If this is an expression, return the GCC equivalent of the expression. If
2468 it is a statement, return the statement. In the case when called for a
2469 statement, it may also add statements to the current statement group, in
2470 which case anything it returns is to be interpreted as occurring after
2471 anything `it already added. */
2474 gnat_to_gnu (Node_Id gnat_node)
2476 bool went_into_elab_proc = false;
2477 tree gnu_result = error_mark_node; /* Default to no value. */
2478 tree gnu_result_type = void_type_node;
2480 tree gnu_lhs, gnu_rhs;
2483 /* Save node number for error message and set location information. */
2484 error_gnat_node = gnat_node;
2485 Sloc_to_locus (Sloc (gnat_node), &input_location);
2487 if (type_annotate_only
2488 && IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call))
2489 return alloc_stmt_list ();
2491 /* If this node is a non-static subexpression and we are only
2492 annotating types, make this into a NULL_EXPR. */
2493 if (type_annotate_only
2494 && IN (Nkind (gnat_node), N_Subexpr)
2495 && Nkind (gnat_node) != N_Identifier
2496 && !Compile_Time_Known_Value (gnat_node))
2497 return build1 (NULL_EXPR, get_unpadded_type (Etype (gnat_node)),
2498 build_call_raise (CE_Range_Check_Failed));
2500 /* If this is a Statement and we are at top level, it must be part of
2501 the elaboration procedure, so mark us as being in that procedure
2502 and push our context. */
2503 if (!current_function_decl
2504 && ((IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call)
2505 && Nkind (gnat_node) != N_Null_Statement)
2506 || Nkind (gnat_node) == N_Procedure_Call_Statement
2507 || Nkind (gnat_node) == N_Label
2508 || Nkind (gnat_node) == N_Implicit_Label_Declaration
2509 || Nkind (gnat_node) == N_Handled_Sequence_Of_Statements
2510 || ((Nkind (gnat_node) == N_Raise_Constraint_Error
2511 || Nkind (gnat_node) == N_Raise_Storage_Error
2512 || Nkind (gnat_node) == N_Raise_Program_Error)
2513 && (Ekind (Etype (gnat_node)) == E_Void))))
2515 current_function_decl = TREE_VALUE (gnu_elab_proc_stack);
2516 start_stmt_group ();
2518 went_into_elab_proc = true;
2521 switch (Nkind (gnat_node))
2523 /********************************/
2524 /* Chapter 2: Lexical Elements: */
2525 /********************************/
2528 case N_Expanded_Name:
2529 case N_Operator_Symbol:
2530 case N_Defining_Identifier:
2531 gnu_result = Identifier_to_gnu (gnat_node, &gnu_result_type);
2534 case N_Integer_Literal:
2538 /* Get the type of the result, looking inside any padding and
2539 justified modular types. Then get the value in that type. */
2540 gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node));
2542 if (TREE_CODE (gnu_type) == RECORD_TYPE
2543 && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
2544 gnu_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
2546 gnu_result = UI_To_gnu (Intval (gnat_node), gnu_type);
2548 /* If the result overflows (meaning it doesn't fit in its base type),
2549 abort. We would like to check that the value is within the range
2550 of the subtype, but that causes problems with subtypes whose usage
2551 will raise Constraint_Error and with biased representation, so
2553 gcc_assert (!TREE_CONSTANT_OVERFLOW (gnu_result));
2557 case N_Character_Literal:
2558 /* If a Entity is present, it means that this was one of the
2559 literals in a user-defined character type. In that case,
2560 just return the value in the CONST_DECL. Otherwise, use the
2561 character code. In that case, the base type should be an
2562 INTEGER_TYPE, but we won't bother checking for that. */
2563 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2564 if (Present (Entity (gnat_node)))
2565 gnu_result = DECL_INITIAL (get_gnu_tree (Entity (gnat_node)));
2570 (gnu_result_type, UI_To_CC (Char_Literal_Value (gnat_node))),
2571 false, false, false);
2574 case N_Real_Literal:
2575 /* If this is of a fixed-point type, the value we want is the
2576 value of the corresponding integer. */
2577 if (IN (Ekind (Underlying_Type (Etype (gnat_node))), Fixed_Point_Kind))
2579 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2580 gnu_result = UI_To_gnu (Corresponding_Integer_Value (gnat_node),
2582 gcc_assert (!TREE_CONSTANT_OVERFLOW (gnu_result));
2585 /* We should never see a Vax_Float type literal, since the front end
2586 is supposed to transform these using appropriate conversions */
2587 else if (Vax_Float (Underlying_Type (Etype (gnat_node))))
2592 Ureal ur_realval = Realval (gnat_node);
2594 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2596 /* If the real value is zero, so is the result. Otherwise,
2597 convert it to a machine number if it isn't already. That
2598 forces BASE to 0 or 2 and simplifies the rest of our logic. */
2599 if (UR_Is_Zero (ur_realval))
2600 gnu_result = convert (gnu_result_type, integer_zero_node);
2603 if (!Is_Machine_Number (gnat_node))
2605 = Machine (Base_Type (Underlying_Type (Etype (gnat_node))),
2606 ur_realval, Round_Even, gnat_node);
2609 = UI_To_gnu (Numerator (ur_realval), gnu_result_type);
2611 /* If we have a base of zero, divide by the denominator.
2612 Otherwise, the base must be 2 and we scale the value, which
2613 we know can fit in the mantissa of the type (hence the use
2614 of that type above). */
2615 if (No (Rbase (ur_realval)))
2617 = build_binary_op (RDIV_EXPR,
2618 get_base_type (gnu_result_type),
2620 UI_To_gnu (Denominator (ur_realval),
2624 REAL_VALUE_TYPE tmp;
2626 gcc_assert (Rbase (ur_realval) == 2);
2627 real_ldexp (&tmp, &TREE_REAL_CST (gnu_result),
2628 - UI_To_Int (Denominator (ur_realval)));
2629 gnu_result = build_real (gnu_result_type, tmp);
2633 /* Now see if we need to negate the result. Do it this way to
2634 properly handle -0. */
2635 if (UR_Is_Negative (Realval (gnat_node)))
2637 = build_unary_op (NEGATE_EXPR, get_base_type (gnu_result_type),
2643 case N_String_Literal:
2644 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2645 if (TYPE_PRECISION (TREE_TYPE (gnu_result_type)) == HOST_BITS_PER_CHAR)
2647 String_Id gnat_string = Strval (gnat_node);
2648 int length = String_Length (gnat_string);
2649 char *string = (char *) alloca (length + 1);
2652 /* Build the string with the characters in the literal. Note
2653 that Ada strings are 1-origin. */
2654 for (i = 0; i < length; i++)
2655 string[i] = Get_String_Char (gnat_string, i + 1);
2657 /* Put a null at the end of the string in case it's in a context
2658 where GCC will want to treat it as a C string. */
2661 gnu_result = build_string (length, string);
2663 /* Strings in GCC don't normally have types, but we want
2664 this to not be converted to the array type. */
2665 TREE_TYPE (gnu_result) = gnu_result_type;
2669 /* Build a list consisting of each character, then make
2671 String_Id gnat_string = Strval (gnat_node);
2672 int length = String_Length (gnat_string);
2674 tree gnu_list = NULL_TREE;
2675 tree gnu_idx = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type));
2677 for (i = 0; i < length; i++)
2680 = tree_cons (gnu_idx,
2681 build_int_cst (TREE_TYPE (gnu_result_type),
2682 Get_String_Char (gnat_string,
2686 gnu_idx = int_const_binop (PLUS_EXPR, gnu_idx, integer_one_node,
2691 = gnat_build_constructor (gnu_result_type, nreverse (gnu_list));
2696 gnu_result = Pragma_to_gnu (gnat_node);
2699 /**************************************/
2700 /* Chapter 3: Declarations and Types: */
2701 /**************************************/
2703 case N_Subtype_Declaration:
2704 case N_Full_Type_Declaration:
2705 case N_Incomplete_Type_Declaration:
2706 case N_Private_Type_Declaration:
2707 case N_Private_Extension_Declaration:
2708 case N_Task_Type_Declaration:
2709 process_type (Defining_Entity (gnat_node));
2710 gnu_result = alloc_stmt_list ();
2713 case N_Object_Declaration:
2714 case N_Exception_Declaration:
2715 gnat_temp = Defining_Entity (gnat_node);
2716 gnu_result = alloc_stmt_list ();
2718 /* If we are just annotating types and this object has an unconstrained
2719 or task type, don't elaborate it. */
2720 if (type_annotate_only
2721 && (((Is_Array_Type (Etype (gnat_temp))
2722 || Is_Record_Type (Etype (gnat_temp)))
2723 && !Is_Constrained (Etype (gnat_temp)))
2724 || Is_Concurrent_Type (Etype (gnat_temp))))
2727 if (Present (Expression (gnat_node))
2728 && !(Nkind (gnat_node) == N_Object_Declaration
2729 && No_Initialization (gnat_node))
2730 && (!type_annotate_only
2731 || Compile_Time_Known_Value (Expression (gnat_node))))
2733 gnu_expr = gnat_to_gnu (Expression (gnat_node));
2734 if (Do_Range_Check (Expression (gnat_node)))
2735 gnu_expr = emit_range_check (gnu_expr, Etype (gnat_temp));
2737 /* If this object has its elaboration delayed, we must force
2738 evaluation of GNU_EXPR right now and save it for when the object
2740 if (Present (Freeze_Node (gnat_temp)))
2742 if ((Is_Public (gnat_temp) || global_bindings_p ())
2743 && !TREE_CONSTANT (gnu_expr))
2745 = create_var_decl (create_concat_name (gnat_temp, "init"),
2746 NULL_TREE, TREE_TYPE (gnu_expr),
2747 gnu_expr, false, Is_Public (gnat_temp),
2748 false, false, NULL, gnat_temp);
2750 gnu_expr = maybe_variable (gnu_expr);
2752 save_gnu_tree (gnat_node, gnu_expr, true);
2756 gnu_expr = NULL_TREE;
2758 if (type_annotate_only && gnu_expr && TREE_CODE (gnu_expr) == ERROR_MARK)
2759 gnu_expr = NULL_TREE;
2761 if (No (Freeze_Node (gnat_temp)))
2762 gnat_to_gnu_entity (gnat_temp, gnu_expr, 1);
2765 case N_Object_Renaming_Declaration:
2766 gnat_temp = Defining_Entity (gnat_node);
2768 /* Don't do anything if this renaming is handled by the front end or if
2769 we are just annotating types and this object has a composite or task
2770 type, don't elaborate it. We return the result in case it has any
2771 SAVE_EXPRs in it that need to be evaluated here. */
2772 if (!Is_Renaming_Of_Object (gnat_temp)
2773 && ! (type_annotate_only
2774 && (Is_Array_Type (Etype (gnat_temp))
2775 || Is_Record_Type (Etype (gnat_temp))
2776 || Is_Concurrent_Type (Etype (gnat_temp)))))
2778 = gnat_to_gnu_entity (gnat_temp,
2779 gnat_to_gnu (Renamed_Object (gnat_temp)), 1);
2781 gnu_result = alloc_stmt_list ();
2784 case N_Implicit_Label_Declaration:
2785 gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, 1);
2786 gnu_result = alloc_stmt_list ();
2789 case N_Exception_Renaming_Declaration:
2790 case N_Number_Declaration:
2791 case N_Package_Renaming_Declaration:
2792 case N_Subprogram_Renaming_Declaration:
2793 /* These are fully handled in the front end. */
2794 gnu_result = alloc_stmt_list ();
2797 /*************************************/
2798 /* Chapter 4: Names and Expressions: */
2799 /*************************************/
2801 case N_Explicit_Dereference:
2802 gnu_result = gnat_to_gnu (Prefix (gnat_node));
2803 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2804 gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result);
2807 case N_Indexed_Component:
2809 tree gnu_array_object = gnat_to_gnu (Prefix (gnat_node));
2813 Node_Id *gnat_expr_array;
2815 gnu_array_object = maybe_implicit_deref (gnu_array_object);
2816 gnu_array_object = maybe_unconstrained_array (gnu_array_object);
2818 /* If we got a padded type, remove it too. */
2819 if (TREE_CODE (TREE_TYPE (gnu_array_object)) == RECORD_TYPE
2820 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_array_object)))
2822 = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_array_object))),
2825 gnu_result = gnu_array_object;
2827 /* First compute the number of dimensions of the array, then
2828 fill the expression array, the order depending on whether
2829 this is a Convention_Fortran array or not. */
2830 for (ndim = 1, gnu_type = TREE_TYPE (gnu_array_object);
2831 TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
2832 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type));
2833 ndim++, gnu_type = TREE_TYPE (gnu_type))
2836 gnat_expr_array = (Node_Id *) alloca (ndim * sizeof (Node_Id));
2838 if (TYPE_CONVENTION_FORTRAN_P (TREE_TYPE (gnu_array_object)))
2839 for (i = ndim - 1, gnat_temp = First (Expressions (gnat_node));
2841 i--, gnat_temp = Next (gnat_temp))
2842 gnat_expr_array[i] = gnat_temp;
2844 for (i = 0, gnat_temp = First (Expressions (gnat_node));
2846 i++, gnat_temp = Next (gnat_temp))
2847 gnat_expr_array[i] = gnat_temp;
2849 for (i = 0, gnu_type = TREE_TYPE (gnu_array_object);
2850 i < ndim; i++, gnu_type = TREE_TYPE (gnu_type))
2852 gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE);
2853 gnat_temp = gnat_expr_array[i];
2854 gnu_expr = gnat_to_gnu (gnat_temp);
2856 if (Do_Range_Check (gnat_temp))
2859 (gnu_array_object, gnu_expr,
2860 TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
2861 TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
2863 gnu_result = build_binary_op (ARRAY_REF, NULL_TREE,
2864 gnu_result, gnu_expr);
2868 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2874 Node_Id gnat_range_node = Discrete_Range (gnat_node);
2876 gnu_result = gnat_to_gnu (Prefix (gnat_node));
2877 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2879 /* Do any implicit dereferences of the prefix and do any needed
2881 gnu_result = maybe_implicit_deref (gnu_result);
2882 gnu_result = maybe_unconstrained_array (gnu_result);
2883 gnu_type = TREE_TYPE (gnu_result);
2884 if (Do_Range_Check (gnat_range_node))
2886 /* Get the bounds of the slice. */
2888 = TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_result_type));
2889 tree gnu_min_expr = TYPE_MIN_VALUE (gnu_index_type);
2890 tree gnu_max_expr = TYPE_MAX_VALUE (gnu_index_type);
2891 tree gnu_expr_l, gnu_expr_h, gnu_expr_type;
2893 /* Check to see that the minimum slice value is in range */
2896 (gnu_result, gnu_min_expr,
2897 TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
2898 TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
2900 /* Check to see that the maximum slice value is in range */
2903 (gnu_result, gnu_max_expr,
2904 TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
2905 TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
2907 /* Derive a good type to convert everything too */
2908 gnu_expr_type = get_base_type (TREE_TYPE (gnu_expr_l));
2910 /* Build a compound expression that does the range checks */
2912 = build_binary_op (COMPOUND_EXPR, gnu_expr_type,
2913 convert (gnu_expr_type, gnu_expr_h),
2914 convert (gnu_expr_type, gnu_expr_l));
2916 /* Build a conditional expression that returns the range checks
2917 expression if the slice range is not null (max >= min) or
2918 returns the min if the slice range is null */
2920 = fold (build3 (COND_EXPR, gnu_expr_type,
2921 build_binary_op (GE_EXPR, gnu_expr_type,
2922 convert (gnu_expr_type,
2924 convert (gnu_expr_type,
2926 gnu_expr, gnu_min_expr));
2929 gnu_expr = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type));
2931 gnu_result = build_binary_op (ARRAY_RANGE_REF, gnu_result_type,
2932 gnu_result, gnu_expr);
2936 case N_Selected_Component:
2938 tree gnu_prefix = gnat_to_gnu (Prefix (gnat_node));
2939 Entity_Id gnat_field = Entity (Selector_Name (gnat_node));
2940 Entity_Id gnat_pref_type = Etype (Prefix (gnat_node));
2943 while (IN (Ekind (gnat_pref_type), Incomplete_Or_Private_Kind)
2944 || IN (Ekind (gnat_pref_type), Access_Kind))
2946 if (IN (Ekind (gnat_pref_type), Incomplete_Or_Private_Kind))
2947 gnat_pref_type = Underlying_Type (gnat_pref_type);
2948 else if (IN (Ekind (gnat_pref_type), Access_Kind))
2949 gnat_pref_type = Designated_Type (gnat_pref_type);
2952 gnu_prefix = maybe_implicit_deref (gnu_prefix);
2954 /* For discriminant references in tagged types always substitute the
2955 corresponding discriminant as the actual selected component. */
2957 if (Is_Tagged_Type (gnat_pref_type))
2958 while (Present (Corresponding_Discriminant (gnat_field)))
2959 gnat_field = Corresponding_Discriminant (gnat_field);
2961 /* For discriminant references of untagged types always substitute the
2962 corresponding stored discriminant. */
2964 else if (Present (Corresponding_Discriminant (gnat_field)))
2965 gnat_field = Original_Record_Component (gnat_field);
2967 /* Handle extracting the real or imaginary part of a complex.
2968 The real part is the first field and the imaginary the last. */
2970 if (TREE_CODE (TREE_TYPE (gnu_prefix)) == COMPLEX_TYPE)
2971 gnu_result = build_unary_op (Present (Next_Entity (gnat_field))
2972 ? REALPART_EXPR : IMAGPART_EXPR,
2973 NULL_TREE, gnu_prefix);
2976 gnu_field = gnat_to_gnu_field_decl (gnat_field);
2978 /* If there are discriminants, the prefix might be
2979 evaluated more than once, which is a problem if it has
2981 if (Has_Discriminants (Is_Access_Type (Etype (Prefix (gnat_node)))
2982 ? Designated_Type (Etype
2983 (Prefix (gnat_node)))
2984 : Etype (Prefix (gnat_node))))
2985 gnu_prefix = gnat_stabilize_reference (gnu_prefix, 0);
2988 = build_component_ref (gnu_prefix, NULL_TREE, gnu_field,
2989 (Nkind (Parent (gnat_node))
2990 == N_Attribute_Reference));
2993 gcc_assert (gnu_result);
2994 gnu_result_type = get_unpadded_type (Etype (gnat_node));
2998 case N_Attribute_Reference:
3000 /* The attribute designator (like an enumeration value). */
3001 int attribute = Get_Attribute_Id (Attribute_Name (gnat_node));
3003 /* The Elab_Spec and Elab_Body attributes are special in that
3004 Prefix is a unit, not an object with a GCC equivalent. Similarly
3005 for Elaborated, since that variable isn't otherwise known. */
3006 if (attribute == Attr_Elab_Body || attribute == Attr_Elab_Spec)
3007 return (create_subprog_decl
3008 (create_concat_name (Entity (Prefix (gnat_node)),
3009 attribute == Attr_Elab_Body
3010 ? "elabb" : "elabs"),
3011 NULL_TREE, void_ftype, NULL_TREE, false, true, true, NULL,
3014 gnu_result = Attribute_to_gnu (gnat_node, &gnu_result_type, attribute);
3019 /* Like 'Access as far as we are concerned. */
3020 gnu_result = gnat_to_gnu (Prefix (gnat_node));
3021 gnu_result = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_result);
3022 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3026 case N_Extension_Aggregate:
3030 /* ??? It is wrong to evaluate the type now, but there doesn't
3031 seem to be any other practical way of doing it. */
3033 gcc_assert (!Expansion_Delayed (gnat_node));
3035 gnu_aggr_type = gnu_result_type
3036 = get_unpadded_type (Etype (gnat_node));
3038 if (TREE_CODE (gnu_result_type) == RECORD_TYPE
3039 && TYPE_CONTAINS_TEMPLATE_P (gnu_result_type))
3041 = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_result_type)));
3043 if (Null_Record_Present (gnat_node))
3044 gnu_result = gnat_build_constructor (gnu_aggr_type, NULL_TREE);
3046 else if (TREE_CODE (gnu_aggr_type) == UNION_TYPE
3047 && TYPE_UNCHECKED_UNION_P (gnu_aggr_type))
3049 /* The first element is the discrimant, which we ignore. The
3050 next is the field we're building. Convert the expression
3051 to the type of the field and then to the union type. */
3053 = Next (First (Component_Associations (gnat_node)));
3054 Entity_Id gnat_field = Entity (First (Choices (gnat_assoc)));
3056 = TREE_TYPE (gnat_to_gnu_entity (gnat_field, NULL_TREE, 0));
3058 gnu_result = convert (gnu_field_type,
3059 gnat_to_gnu (Expression (gnat_assoc)));
3061 else if (TREE_CODE (gnu_aggr_type) == RECORD_TYPE
3062 || TREE_CODE (gnu_aggr_type) == UNION_TYPE)
3064 = assoc_to_constructor (First (Component_Associations (gnat_node)),
3066 else if (TREE_CODE (gnu_aggr_type) == ARRAY_TYPE)
3067 gnu_result = pos_to_constructor (First (Expressions (gnat_node)),
3069 Component_Type (Etype (gnat_node)));
3070 else if (TREE_CODE (gnu_aggr_type) == COMPLEX_TYPE)
3073 (COMPLEX_EXPR, gnu_aggr_type,
3074 gnat_to_gnu (Expression (First
3075 (Component_Associations (gnat_node)))),
3076 gnat_to_gnu (Expression
3078 (First (Component_Associations (gnat_node))))));
3082 gnu_result = convert (gnu_result_type, gnu_result);
3087 gnu_result = null_pointer_node;
3088 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3091 case N_Type_Conversion:
3092 case N_Qualified_Expression:
3093 /* Get the operand expression. */
3094 gnu_result = gnat_to_gnu (Expression (gnat_node));
3095 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3098 = convert_with_check (Etype (gnat_node), gnu_result,
3099 Do_Overflow_Check (gnat_node),
3100 Do_Range_Check (Expression (gnat_node)),
3101 Nkind (gnat_node) == N_Type_Conversion
3102 && Float_Truncate (gnat_node));
3105 case N_Unchecked_Type_Conversion:
3106 gnu_result = gnat_to_gnu (Expression (gnat_node));
3107 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3109 /* If the result is a pointer type, see if we are improperly
3110 converting to a stricter alignment. */
3112 if (STRICT_ALIGNMENT && POINTER_TYPE_P (gnu_result_type)
3113 && IN (Ekind (Etype (gnat_node)), Access_Kind))
3115 unsigned int align = known_alignment (gnu_result);
3116 tree gnu_obj_type = TREE_TYPE (gnu_result_type);
3117 unsigned int oalign = TYPE_ALIGN (gnu_obj_type);
3119 if (align != 0 && align < oalign && !TYPE_ALIGN_OK (gnu_obj_type))
3120 post_error_ne_tree_2
3121 ("?source alignment (^) '< alignment of & (^)",
3122 gnat_node, Designated_Type (Etype (gnat_node)),
3123 size_int (align / BITS_PER_UNIT), oalign / BITS_PER_UNIT);
3126 gnu_result = unchecked_convert (gnu_result_type, gnu_result,
3127 No_Truncation (gnat_node));
3133 tree gnu_object = gnat_to_gnu (Left_Opnd (gnat_node));
3134 Node_Id gnat_range = Right_Opnd (gnat_node);
3138 /* GNAT_RANGE is either an N_Range node or an identifier
3139 denoting a subtype. */
3140 if (Nkind (gnat_range) == N_Range)
3142 gnu_low = gnat_to_gnu (Low_Bound (gnat_range));
3143 gnu_high = gnat_to_gnu (High_Bound (gnat_range));
3145 else if (Nkind (gnat_range) == N_Identifier
3146 || Nkind (gnat_range) == N_Expanded_Name)
3148 tree gnu_range_type = get_unpadded_type (Entity (gnat_range));
3150 gnu_low = TYPE_MIN_VALUE (gnu_range_type);
3151 gnu_high = TYPE_MAX_VALUE (gnu_range_type);
3156 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3158 /* If LOW and HIGH are identical, perform an equality test.
3159 Otherwise, ensure that GNU_OBJECT is only evaluated once
3160 and perform a full range test. */
3161 if (operand_equal_p (gnu_low, gnu_high, 0))
3162 gnu_result = build_binary_op (EQ_EXPR, gnu_result_type,
3163 gnu_object, gnu_low);
3166 gnu_object = protect_multiple_eval (gnu_object);
3168 = build_binary_op (TRUTH_ANDIF_EXPR, gnu_result_type,
3169 build_binary_op (GE_EXPR, gnu_result_type,
3170 gnu_object, gnu_low),
3171 build_binary_op (LE_EXPR, gnu_result_type,
3172 gnu_object, gnu_high));
3175 if (Nkind (gnat_node) == N_Not_In)
3176 gnu_result = invert_truthvalue (gnu_result);
3181 gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
3182 gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
3183 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3184 gnu_result = build_binary_op (FLOAT_TYPE_P (gnu_result_type)
3186 : (Rounded_Result (gnat_node)
3187 ? ROUND_DIV_EXPR : TRUNC_DIV_EXPR),
3188 gnu_result_type, gnu_lhs, gnu_rhs);
3191 case N_Op_Or: case N_Op_And: case N_Op_Xor:
3192 /* These can either be operations on booleans or on modular types.
3193 Fall through for boolean types since that's the way GNU_CODES is
3195 if (IN (Ekind (Underlying_Type (Etype (gnat_node))),
3196 Modular_Integer_Kind))
3199 = (Nkind (gnat_node) == N_Op_Or ? BIT_IOR_EXPR
3200 : Nkind (gnat_node) == N_Op_And ? BIT_AND_EXPR
3203 gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
3204 gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
3205 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3206 gnu_result = build_binary_op (code, gnu_result_type,
3211 /* ... fall through ... */
3213 case N_Op_Eq: case N_Op_Ne: case N_Op_Lt:
3214 case N_Op_Le: case N_Op_Gt: case N_Op_Ge:
3215 case N_Op_Add: case N_Op_Subtract: case N_Op_Multiply:
3216 case N_Op_Mod: case N_Op_Rem:
3217 case N_Op_Rotate_Left:
3218 case N_Op_Rotate_Right:
3219 case N_Op_Shift_Left:
3220 case N_Op_Shift_Right:
3221 case N_Op_Shift_Right_Arithmetic:
3222 case N_And_Then: case N_Or_Else:
3224 enum tree_code code = gnu_codes[Nkind (gnat_node)];
3227 gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
3228 gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
3229 gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node));
3231 /* If this is a comparison operator, convert any references to
3232 an unconstrained array value into a reference to the
3234 if (TREE_CODE_CLASS (code) == tcc_comparison)
3236 gnu_lhs = maybe_unconstrained_array (gnu_lhs);
3237 gnu_rhs = maybe_unconstrained_array (gnu_rhs);
3240 /* If the result type is a private type, its full view may be a
3241 numeric subtype. The representation we need is that of its base
3242 type, given that it is the result of an arithmetic operation. */
3243 else if (Is_Private_Type (Etype (gnat_node)))
3244 gnu_type = gnu_result_type
3245 = get_unpadded_type (Base_Type (Full_View (Etype (gnat_node))));
3247 /* If this is a shift whose count is not guaranteed to be correct,
3248 we need to adjust the shift count. */
3249 if (IN (Nkind (gnat_node), N_Op_Shift)
3250 && !Shift_Count_OK (gnat_node))
3252 tree gnu_count_type = get_base_type (TREE_TYPE (gnu_rhs));
3254 = convert (gnu_count_type, TYPE_SIZE (gnu_type));
3256 if (Nkind (gnat_node) == N_Op_Rotate_Left
3257 || Nkind (gnat_node) == N_Op_Rotate_Right)
3258 gnu_rhs = build_binary_op (TRUNC_MOD_EXPR, gnu_count_type,
3259 gnu_rhs, gnu_max_shift);
3260 else if (Nkind (gnat_node) == N_Op_Shift_Right_Arithmetic)
3263 (MIN_EXPR, gnu_count_type,
3264 build_binary_op (MINUS_EXPR,
3267 convert (gnu_count_type,
3272 /* For right shifts, the type says what kind of shift to do,
3273 so we may need to choose a different type. */
3274 if (Nkind (gnat_node) == N_Op_Shift_Right
3275 && !TYPE_UNSIGNED (gnu_type))
3276 gnu_type = gnat_unsigned_type (gnu_type);
3277 else if (Nkind (gnat_node) == N_Op_Shift_Right_Arithmetic
3278 && TYPE_UNSIGNED (gnu_type))
3279 gnu_type = gnat_signed_type (gnu_type);
3281 if (gnu_type != gnu_result_type)
3283 gnu_lhs = convert (gnu_type, gnu_lhs);
3284 gnu_rhs = convert (gnu_type, gnu_rhs);
3287 gnu_result = build_binary_op (code, gnu_type, gnu_lhs, gnu_rhs);
3289 /* If this is a logical shift with the shift count not verified,
3290 we must return zero if it is too large. We cannot compensate
3291 above in this case. */
3292 if ((Nkind (gnat_node) == N_Op_Shift_Left
3293 || Nkind (gnat_node) == N_Op_Shift_Right)
3294 && !Shift_Count_OK (gnat_node))
3298 build_binary_op (GE_EXPR, integer_type_node,
3300 convert (TREE_TYPE (gnu_rhs),
3301 TYPE_SIZE (gnu_type))),
3302 convert (gnu_type, integer_zero_node),
3307 case N_Conditional_Expression:
3309 tree gnu_cond = gnat_to_gnu (First (Expressions (gnat_node)));
3310 tree gnu_true = gnat_to_gnu (Next (First (Expressions (gnat_node))));
3312 = gnat_to_gnu (Next (Next (First (Expressions (gnat_node)))));
3314 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3315 gnu_result = build_cond_expr (gnu_result_type,
3316 gnat_truthvalue_conversion (gnu_cond),
3317 gnu_true, gnu_false);
3322 gnu_result = gnat_to_gnu (Right_Opnd (gnat_node));
3323 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3327 /* This case can apply to a boolean or a modular type.
3328 Fall through for a boolean operand since GNU_CODES is set
3329 up to handle this. */
3330 if (IN (Ekind (Etype (gnat_node)), Modular_Integer_Kind))
3332 gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node));
3333 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3334 gnu_result = build_unary_op (BIT_NOT_EXPR, gnu_result_type,
3339 /* ... fall through ... */
3341 case N_Op_Minus: case N_Op_Abs:
3342 gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node));
3344 if (Ekind (Etype (gnat_node)) != E_Private_Type)
3345 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3347 gnu_result_type = get_unpadded_type (Base_Type
3348 (Full_View (Etype (gnat_node))));
3350 gnu_result = build_unary_op (gnu_codes[Nkind (gnat_node)],
3351 gnu_result_type, gnu_expr);
3358 bool ignore_init_type = false;
3360 gnat_temp = Expression (gnat_node);
3362 /* The Expression operand can either be an N_Identifier or
3363 Expanded_Name, which must represent a type, or a
3364 N_Qualified_Expression, which contains both the object type and an
3365 initial value for the object. */
3366 if (Nkind (gnat_temp) == N_Identifier
3367 || Nkind (gnat_temp) == N_Expanded_Name)
3368 gnu_type = gnat_to_gnu_type (Entity (gnat_temp));
3369 else if (Nkind (gnat_temp) == N_Qualified_Expression)
3371 Entity_Id gnat_desig_type
3372 = Designated_Type (Underlying_Type (Etype (gnat_node)));
3374 ignore_init_type = Has_Constrained_Partial_View (gnat_desig_type);
3375 gnu_init = gnat_to_gnu (Expression (gnat_temp));
3377 gnu_init = maybe_unconstrained_array (gnu_init);
3378 if (Do_Range_Check (Expression (gnat_temp)))
3379 gnu_init = emit_range_check (gnu_init, gnat_desig_type);
3381 if (Is_Elementary_Type (gnat_desig_type)
3382 || Is_Constrained (gnat_desig_type))
3384 gnu_type = gnat_to_gnu_type (gnat_desig_type);
3385 gnu_init = convert (gnu_type, gnu_init);
3389 gnu_type = gnat_to_gnu_type (Etype (Expression (gnat_temp)));
3390 if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
3391 gnu_type = TREE_TYPE (gnu_init);
3393 gnu_init = convert (gnu_type, gnu_init);
3399 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3400 return build_allocator (gnu_type, gnu_init, gnu_result_type,
3401 Procedure_To_Call (gnat_node),
3402 Storage_Pool (gnat_node), gnat_node,
3407 /***************************/
3408 /* Chapter 5: Statements: */
3409 /***************************/
3412 gnu_result = build1 (LABEL_EXPR, void_type_node,
3413 gnat_to_gnu (Identifier (gnat_node)));
3416 case N_Null_Statement:
3417 gnu_result = alloc_stmt_list ();
3420 case N_Assignment_Statement:
3421 /* Get the LHS and RHS of the statement and convert any reference to an
3422 unconstrained array into a reference to the underlying array.
3423 If we are not to do range checking and the RHS is an N_Function_Call,
3424 pass the LHS to the call function. */
3425 gnu_lhs = maybe_unconstrained_array (gnat_to_gnu (Name (gnat_node)));
3427 /* If the type has a size that overflows, convert this into raise of
3428 Storage_Error: execution shouldn't have gotten here anyway. */
3429 if (TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (gnu_lhs))) == INTEGER_CST
3430 && TREE_OVERFLOW (TYPE_SIZE_UNIT (TREE_TYPE (gnu_lhs))))
3431 gnu_result = build_call_raise (SE_Object_Too_Large);
3432 else if (Nkind (Expression (gnat_node)) == N_Function_Call
3433 && !Do_Range_Check (Expression (gnat_node)))
3434 gnu_result = call_to_gnu (Expression (gnat_node),
3435 &gnu_result_type, gnu_lhs);
3439 = maybe_unconstrained_array (gnat_to_gnu (Expression (gnat_node)));
3441 /* If range check is needed, emit code to generate it */
3442 if (Do_Range_Check (Expression (gnat_node)))
3443 gnu_rhs = emit_range_check (gnu_rhs, Etype (Name (gnat_node)));
3446 = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_lhs, gnu_rhs);
3450 case N_If_Statement:
3452 tree *gnu_else_ptr; /* Point to put next "else if" or "else". */
3454 /* Make the outer COND_EXPR. Avoid non-determinism. */
3455 gnu_result = build3 (COND_EXPR, void_type_node,
3456 gnat_to_gnu (Condition (gnat_node)),
3457 NULL_TREE, NULL_TREE);
3458 COND_EXPR_THEN (gnu_result)
3459 = build_stmt_group (Then_Statements (gnat_node), false);
3460 TREE_SIDE_EFFECTS (gnu_result) = 1;
3461 gnu_else_ptr = &COND_EXPR_ELSE (gnu_result);
3463 /* Now make a COND_EXPR for each of the "else if" parts. Put each
3464 into the previous "else" part and point to where to put any
3465 outer "else". Also avoid non-determinism. */
3466 if (Present (Elsif_Parts (gnat_node)))
3467 for (gnat_temp = First (Elsif_Parts (gnat_node));
3468 Present (gnat_temp); gnat_temp = Next (gnat_temp))
3470 gnu_expr = build3 (COND_EXPR, void_type_node,
3471 gnat_to_gnu (Condition (gnat_temp)),
3472 NULL_TREE, NULL_TREE);
3473 COND_EXPR_THEN (gnu_expr)
3474 = build_stmt_group (Then_Statements (gnat_temp), false);
3475 TREE_SIDE_EFFECTS (gnu_expr) = 1;
3476 annotate_with_node (gnu_expr, gnat_temp);
3477 *gnu_else_ptr = gnu_expr;
3478 gnu_else_ptr = &COND_EXPR_ELSE (gnu_expr);
3481 *gnu_else_ptr = build_stmt_group (Else_Statements (gnat_node), false);
3485 case N_Case_Statement:
3486 gnu_result = Case_Statement_to_gnu (gnat_node);
3489 case N_Loop_Statement:
3490 gnu_result = Loop_Statement_to_gnu (gnat_node);
3493 case N_Block_Statement:
3494 start_stmt_group ();
3496 process_decls (Declarations (gnat_node), Empty, Empty, true, true);
3497 add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node)));
3499 gnu_result = end_stmt_group ();
3501 if (Present (Identifier (gnat_node)))
3502 mark_out_of_scope (Entity (Identifier (gnat_node)));
3505 case N_Exit_Statement:
3507 = build2 (EXIT_STMT, void_type_node,
3508 (Present (Condition (gnat_node))
3509 ? gnat_to_gnu (Condition (gnat_node)) : NULL_TREE),
3510 (Present (Name (gnat_node))
3511 ? get_gnu_tree (Entity (Name (gnat_node)))
3512 : TREE_VALUE (gnu_loop_label_stack)));
3515 case N_Return_Statement:
3517 /* The gnu function type of the subprogram currently processed. */
3518 tree gnu_subprog_type = TREE_TYPE (current_function_decl);
3519 /* The return value from the subprogram. */
3520 tree gnu_ret_val = NULL_TREE;
3521 /* The place to put the return value. */
3524 /* If we are dealing with a "return;" from an Ada procedure with
3525 parameters passed by copy in copy out, we need to return a record
3526 containing the final values of these parameters. If the list
3527 contains only one entry, return just that entry.
3529 For a full description of the copy in copy out parameter mechanism,
3530 see the part of the gnat_to_gnu_entity routine dealing with the
3531 translation of subprograms.
3533 But if we have a return label defined, convert this into
3534 a branch to that label. */
3536 if (TREE_VALUE (gnu_return_label_stack))
3538 gnu_result = build1 (GOTO_EXPR, void_type_node,
3539 TREE_VALUE (gnu_return_label_stack));
3543 else if (TYPE_CI_CO_LIST (gnu_subprog_type))
3545 gnu_lhs = DECL_RESULT (current_function_decl);
3546 if (list_length (TYPE_CI_CO_LIST (gnu_subprog_type)) == 1)
3547 gnu_ret_val = TREE_VALUE (TYPE_CI_CO_LIST (gnu_subprog_type));
3550 = gnat_build_constructor (TREE_TYPE (gnu_subprog_type),
3551 TYPE_CI_CO_LIST (gnu_subprog_type));
3554 /* If the Ada subprogram is a function, we just need to return the
3555 expression. If the subprogram returns an unconstrained
3556 array, we have to allocate a new version of the result and
3557 return it. If we return by reference, return a pointer. */
3559 else if (Present (Expression (gnat_node)))
3561 /* If the current function returns by target pointer and we
3562 are doing a call, pass that target to the call. */
3563 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type)
3564 && Nkind (Expression (gnat_node)) == N_Function_Call)
3567 = build_unary_op (INDIRECT_REF, NULL_TREE,
3568 DECL_ARGUMENTS (current_function_decl));
3569 gnu_result = call_to_gnu (Expression (gnat_node),
3570 &gnu_result_type, gnu_lhs);
3574 gnu_ret_val = gnat_to_gnu (Expression (gnat_node));
3576 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
3577 /* The original return type was unconstrained so dereference
3578 the TARGET pointer in the actual return value's type. */
3580 = build_unary_op (INDIRECT_REF, TREE_TYPE (gnu_ret_val),
3581 DECL_ARGUMENTS (current_function_decl));
3583 gnu_lhs = DECL_RESULT (current_function_decl);
3585 /* Do not remove the padding from GNU_RET_VAL if the inner
3586 type is self-referential since we want to allocate the fixed
3587 size in that case. */
3588 if (TREE_CODE (gnu_ret_val) == COMPONENT_REF
3589 && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0)))
3591 && (TYPE_IS_PADDING_P
3592 (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0))))
3593 && (CONTAINS_PLACEHOLDER_P
3594 (TYPE_SIZE (TREE_TYPE (gnu_ret_val)))))
3595 gnu_ret_val = TREE_OPERAND (gnu_ret_val, 0);
3597 if (TYPE_RETURNS_BY_REF_P (gnu_subprog_type)
3598 || By_Ref (gnat_node))
3600 = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_ret_val);
3602 else if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type))
3604 gnu_ret_val = maybe_unconstrained_array (gnu_ret_val);
3606 /* We have two cases: either the function returns with
3607 depressed stack or not. If not, we allocate on the
3608 secondary stack. If so, we allocate in the stack frame.
3609 if no copy is needed, the front end will set By_Ref,
3610 which we handle in the case above. */
3611 if (TYPE_RETURNS_STACK_DEPRESSED (gnu_subprog_type))
3613 = build_allocator (TREE_TYPE (gnu_ret_val),
3615 TREE_TYPE (gnu_subprog_type),
3616 0, -1, gnat_node, false);
3619 = build_allocator (TREE_TYPE (gnu_ret_val),
3621 TREE_TYPE (gnu_subprog_type),
3622 Procedure_To_Call (gnat_node),
3623 Storage_Pool (gnat_node),
3629 /* If the Ada subprogram is a regular procedure, just return. */
3630 gnu_lhs = NULL_TREE;
3632 if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
3635 gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE,
3636 gnu_lhs, gnu_ret_val);
3637 add_stmt_with_node (gnu_result, gnat_node);
3638 gnu_lhs = NULL_TREE;
3641 gnu_result = build_return_expr (gnu_lhs, gnu_ret_val);
3645 case N_Goto_Statement:
3646 gnu_result = build1 (GOTO_EXPR, void_type_node,
3647 gnat_to_gnu (Name (gnat_node)));
3650 /****************************/
3651 /* Chapter 6: Subprograms: */
3652 /****************************/
3654 case N_Subprogram_Declaration:
3655 /* Unless there is a freeze node, declare the subprogram. We consider
3656 this a "definition" even though we're not generating code for
3657 the subprogram because we will be making the corresponding GCC
3660 if (No (Freeze_Node (Defining_Entity (Specification (gnat_node)))))
3661 gnat_to_gnu_entity (Defining_Entity (Specification (gnat_node)),
3663 gnu_result = alloc_stmt_list ();
3666 case N_Abstract_Subprogram_Declaration:
3667 /* This subprogram doesn't exist for code generation purposes, but we
3668 have to elaborate the types of any parameters, unless they are
3669 imported types (nothing to generate in this case). */
3671 = First_Formal (Defining_Entity (Specification (gnat_node)));
3672 Present (gnat_temp);
3673 gnat_temp = Next_Formal_With_Extras (gnat_temp))
3674 if (Is_Itype (Etype (gnat_temp))
3675 && !From_With_Type (Etype (gnat_temp)))
3676 gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
3678 gnu_result = alloc_stmt_list ();
3681 case N_Defining_Program_Unit_Name:
3682 /* For a child unit identifier go up a level to get the
3683 specification. We get this when we try to find the spec of
3684 a child unit package that is the compilation unit being compiled. */
3685 gnu_result = gnat_to_gnu (Parent (gnat_node));
3688 case N_Subprogram_Body:
3689 Subprogram_Body_to_gnu (gnat_node);
3690 gnu_result = alloc_stmt_list ();
3693 case N_Function_Call:
3694 case N_Procedure_Call_Statement:
3695 gnu_result = call_to_gnu (gnat_node, &gnu_result_type, NULL_TREE);
3698 /*************************/
3699 /* Chapter 7: Packages: */
3700 /*************************/
3702 case N_Package_Declaration:
3703 gnu_result = gnat_to_gnu (Specification (gnat_node));
3706 case N_Package_Specification:
3708 start_stmt_group ();
3709 process_decls (Visible_Declarations (gnat_node),
3710 Private_Declarations (gnat_node), Empty, true, true);
3711 gnu_result = end_stmt_group ();
3714 case N_Package_Body:
3716 /* If this is the body of a generic package - do nothing */
3717 if (Ekind (Corresponding_Spec (gnat_node)) == E_Generic_Package)
3719 gnu_result = alloc_stmt_list ();
3723 start_stmt_group ();
3724 process_decls (Declarations (gnat_node), Empty, Empty, true, true);
3726 if (Present (Handled_Statement_Sequence (gnat_node)))
3727 add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node)));
3729 gnu_result = end_stmt_group ();
3732 /*********************************/
3733 /* Chapter 8: Visibility Rules: */
3734 /*********************************/
3736 case N_Use_Package_Clause:
3737 case N_Use_Type_Clause:
3738 /* Nothing to do here - but these may appear in list of declarations */
3739 gnu_result = alloc_stmt_list ();
3742 /***********************/
3743 /* Chapter 9: Tasks: */
3744 /***********************/
3746 case N_Protected_Type_Declaration:
3747 gnu_result = alloc_stmt_list ();
3750 case N_Single_Task_Declaration:
3751 gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, 1);
3752 gnu_result = alloc_stmt_list ();
3755 /***********************************************************/
3756 /* Chapter 10: Program Structure and Compilation Issues: */
3757 /***********************************************************/
3759 case N_Compilation_Unit:
3761 /* This is not called for the main unit, which is handled in function
3763 start_stmt_group ();
3766 Compilation_Unit_to_gnu (gnat_node);
3767 gnu_result = alloc_stmt_list ();
3770 case N_Subprogram_Body_Stub:
3771 case N_Package_Body_Stub:
3772 case N_Protected_Body_Stub:
3773 case N_Task_Body_Stub:
3774 /* Simply process whatever unit is being inserted. */
3775 gnu_result = gnat_to_gnu (Unit (Library_Unit (gnat_node)));
3779 gnu_result = gnat_to_gnu (Proper_Body (gnat_node));
3782 /***************************/
3783 /* Chapter 11: Exceptions: */
3784 /***************************/
3786 case N_Handled_Sequence_Of_Statements:
3787 /* If there is an At_End procedure attached to this node, and the EH
3788 mechanism is SJLJ, we must have at least a corresponding At_End
3789 handler, unless the No_Exception_Handlers restriction is set. */
3790 gcc_assert (type_annotate_only
3791 || Exception_Mechanism != Setjmp_Longjmp
3792 || No (At_End_Proc (gnat_node))
3793 || Present (Exception_Handlers (gnat_node))
3794 || No_Exception_Handlers_Set ());
3796 gnu_result = Handled_Sequence_Of_Statements_to_gnu (gnat_node);
3799 case N_Exception_Handler:
3800 if (Exception_Mechanism == Setjmp_Longjmp)
3801 gnu_result = Exception_Handler_to_gnu_sjlj (gnat_node);
3802 else if (Exception_Mechanism == Back_End_Exceptions)
3803 gnu_result = Exception_Handler_to_gnu_zcx (gnat_node);
3809 /*******************************/
3810 /* Chapter 12: Generic Units: */
3811 /*******************************/
3813 case N_Generic_Function_Renaming_Declaration:
3814 case N_Generic_Package_Renaming_Declaration:
3815 case N_Generic_Procedure_Renaming_Declaration:
3816 case N_Generic_Package_Declaration:
3817 case N_Generic_Subprogram_Declaration:
3818 case N_Package_Instantiation:
3819 case N_Procedure_Instantiation:
3820 case N_Function_Instantiation:
3821 /* These nodes can appear on a declaration list but there is nothing to
3822 to be done with them. */
3823 gnu_result = alloc_stmt_list ();
3826 /***************************************************/
3827 /* Chapter 13: Representation Clauses and */
3828 /* Implementation-Dependent Features: */
3829 /***************************************************/
3831 case N_Attribute_Definition_Clause:
3833 gnu_result = alloc_stmt_list ();
3835 /* The only one we need deal with is for 'Address. For the others, SEM
3836 puts the information elsewhere. We need only deal with 'Address
3837 if the object has a Freeze_Node (which it never will currently). */
3838 if (Get_Attribute_Id (Chars (gnat_node)) != Attr_Address
3839 || No (Freeze_Node (Entity (Name (gnat_node)))))
3842 /* Get the value to use as the address and save it as the
3843 equivalent for GNAT_TEMP. When the object is frozen,
3844 gnat_to_gnu_entity will do the right thing. */
3845 save_gnu_tree (Entity (Name (gnat_node)),
3846 gnat_to_gnu (Expression (gnat_node)), true);
3849 case N_Enumeration_Representation_Clause:
3850 case N_Record_Representation_Clause:
3852 /* We do nothing with these. SEM puts the information elsewhere. */
3853 gnu_result = alloc_stmt_list ();
3856 case N_Code_Statement:
3857 if (!type_annotate_only)
3859 tree gnu_template = gnat_to_gnu (Asm_Template (gnat_node));
3860 tree gnu_input_list = NULL_TREE, gnu_output_list = NULL_TREE;
3861 tree gnu_clobber_list = NULL_TREE;
3864 /* First process inputs, then outputs, then clobbers. */
3865 Setup_Asm_Inputs (gnat_node);
3866 while (Present (gnat_temp = Asm_Input_Value ()))
3868 tree gnu_value = gnat_to_gnu (gnat_temp);
3869 tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu
3870 (Asm_Input_Constraint ()));
3873 = tree_cons (gnu_constr, gnu_value, gnu_input_list);
3877 Setup_Asm_Outputs (gnat_node);
3878 while (Present (gnat_temp = Asm_Output_Variable ()))
3880 tree gnu_value = gnat_to_gnu (gnat_temp);
3881 tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu
3882 (Asm_Output_Constraint ()));
3885 = tree_cons (gnu_constr, gnu_value, gnu_output_list);
3889 Clobber_Setup (gnat_node);
3890 while ((clobber = Clobber_Get_Next ()))
3892 = tree_cons (NULL_TREE,
3893 build_string (strlen (clobber) + 1, clobber),
3896 gnu_input_list = nreverse (gnu_input_list);
3897 gnu_output_list = nreverse (gnu_output_list);
3898 gnu_result = build4 (ASM_EXPR, void_type_node,
3899 gnu_template, gnu_output_list,
3900 gnu_input_list, gnu_clobber_list);
3901 ASM_VOLATILE_P (gnu_result) = Is_Asm_Volatile (gnat_node);
3904 gnu_result = alloc_stmt_list ();
3908 /***************************************************/
3910 /***************************************************/
3912 case N_Freeze_Entity:
3913 start_stmt_group ();
3914 process_freeze_entity (gnat_node);
3915 process_decls (Actions (gnat_node), Empty, Empty, true, true);
3916 gnu_result = end_stmt_group ();
3919 case N_Itype_Reference:
3920 if (!present_gnu_tree (Itype (gnat_node)))
3921 process_type (Itype (gnat_node));
3923 gnu_result = alloc_stmt_list ();
3926 case N_Free_Statement:
3927 if (!type_annotate_only)
3929 tree gnu_ptr = gnat_to_gnu (Expression (gnat_node));
3934 /* If this is a thin pointer, we must dereference it to create
3935 a fat pointer, then go back below to a thin pointer. The
3936 reason for this is that we need a fat pointer someplace in
3937 order to properly compute the size. */
3938 if (TYPE_THIN_POINTER_P (TREE_TYPE (gnu_ptr)))
3939 gnu_ptr = build_unary_op (ADDR_EXPR, NULL_TREE,
3940 build_unary_op (INDIRECT_REF, NULL_TREE,
3943 /* If this is an unconstrained array, we know the object must
3944 have been allocated with the template in front of the object.
3945 So pass the template address, but get the total size. Do this
3946 by converting to a thin pointer. */
3947 if (TYPE_FAT_POINTER_P (TREE_TYPE (gnu_ptr)))
3949 = convert (build_pointer_type
3950 (TYPE_OBJECT_RECORD_TYPE
3951 (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr)))),
3954 gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr));
3955 gnu_obj_size = TYPE_SIZE_UNIT (gnu_obj_type);
3956 align = TYPE_ALIGN (gnu_obj_type);
3958 if (TREE_CODE (gnu_obj_type) == RECORD_TYPE
3959 && TYPE_CONTAINS_TEMPLATE_P (gnu_obj_type))
3961 tree gnu_char_ptr_type = build_pointer_type (char_type_node);
3962 tree gnu_pos = byte_position (TYPE_FIELDS (gnu_obj_type));
3963 tree gnu_byte_offset
3964 = convert (gnu_char_ptr_type,
3965 size_diffop (size_zero_node, gnu_pos));
3967 gnu_ptr = convert (gnu_char_ptr_type, gnu_ptr);
3968 gnu_ptr = build_binary_op (MINUS_EXPR, gnu_char_ptr_type,
3969 gnu_ptr, gnu_byte_offset);
3972 gnu_result = build_call_alloc_dealloc (gnu_ptr, gnu_obj_size, align,
3973 Procedure_To_Call (gnat_node),
3974 Storage_Pool (gnat_node),
3979 case N_Raise_Constraint_Error:
3980 case N_Raise_Program_Error:
3981 case N_Raise_Storage_Error:
3982 if (type_annotate_only)
3984 gnu_result = alloc_stmt_list ();
3988 gnu_result_type = get_unpadded_type (Etype (gnat_node));
3989 gnu_result = build_call_raise (UI_To_Int (Reason (gnat_node)));
3991 /* If the type is VOID, this is a statement, so we need to
3992 generate the code for the call. Handle a Condition, if there
3994 if (TREE_CODE (gnu_result_type) == VOID_TYPE)
3996 annotate_with_node (gnu_result, gnat_node);
3998 if (Present (Condition (gnat_node)))
3999 gnu_result = build3 (COND_EXPR, void_type_node,
4000 gnat_to_gnu (Condition (gnat_node)),
4001 gnu_result, alloc_stmt_list ());
4004 gnu_result = build1 (NULL_EXPR, gnu_result_type, gnu_result);
4007 case N_Validate_Unchecked_Conversion:
4008 /* If the result is a pointer type, see if we are either converting
4009 from a non-pointer or from a pointer to a type with a different
4010 alias set and warn if so. If the result defined in the same unit as
4011 this unchecked conversion, we can allow this because we can know to
4012 make that type have alias set 0. */
4014 tree gnu_source_type = gnat_to_gnu_type (Source_Type (gnat_node));
4015 tree gnu_target_type = gnat_to_gnu_type (Target_Type (gnat_node));
4017 if (POINTER_TYPE_P (gnu_target_type)
4018 && !In_Same_Source_Unit (Target_Type (gnat_node), gnat_node)
4019 && get_alias_set (TREE_TYPE (gnu_target_type)) != 0
4020 && !No_Strict_Aliasing (Underlying_Type (Target_Type (gnat_node)))
4021 && (!POINTER_TYPE_P (gnu_source_type)
4022 || (get_alias_set (TREE_TYPE (gnu_source_type))
4023 != get_alias_set (TREE_TYPE (gnu_target_type)))))
4026 ("?possible aliasing problem for type&",
4027 gnat_node, Target_Type (gnat_node));
4029 ("\\?use -fno-strict-aliasing switch for references",
4032 ("\\?or use `pragma No_Strict_Aliasing (&);`",
4033 gnat_node, Target_Type (gnat_node));
4036 /* The No_Strict_Aliasing flag is not propagated to the back-end for
4037 fat pointers so unconditionally warn in problematic cases. */
4038 else if (TYPE_FAT_POINTER_P (gnu_target_type))
4041 = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (gnu_target_type)));
4043 if (get_alias_set (array_type) != 0
4044 && (!TYPE_FAT_POINTER_P (gnu_source_type)
4045 || (get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (gnu_source_type))))
4046 != get_alias_set (array_type))))
4049 ("?possible aliasing problem for type&",
4050 gnat_node, Target_Type (gnat_node));
4052 ("\\?use -fno-strict-aliasing switch for references",
4057 gnu_result = alloc_stmt_list ();
4060 case N_Raise_Statement:
4061 case N_Function_Specification:
4062 case N_Procedure_Specification:
4064 case N_Component_Association:
4067 gcc_assert (type_annotate_only);
4068 gnu_result = alloc_stmt_list ();
4071 /* If we pushed our level as part of processing the elaboration routine,
4073 if (went_into_elab_proc)
4075 add_stmt (gnu_result);
4077 gnu_result = end_stmt_group ();
4078 current_function_decl = NULL_TREE;
4081 /* Set the location information into the result. Note that we may have
4082 no result if we tried to build a CALL_EXPR node to a procedure with
4083 no side-effects and optimization is enabled. */
4084 if (gnu_result && EXPR_P (gnu_result))
4085 annotate_with_node (gnu_result, gnat_node);
4087 /* If we're supposed to return something of void_type, it means we have
4088 something we're elaborating for effect, so just return. */
4089 if (TREE_CODE (gnu_result_type) == VOID_TYPE)
4092 /* If the result is a constant that overflows, raise constraint error. */
4093 else if (TREE_CODE (gnu_result) == INTEGER_CST
4094 && TREE_CONSTANT_OVERFLOW (gnu_result))
4096 post_error ("Constraint_Error will be raised at run-time?", gnat_node);
4099 = build1 (NULL_EXPR, gnu_result_type,
4100 build_call_raise (CE_Overflow_Check_Failed));
4103 /* If our result has side-effects and is of an unconstrained type,
4104 make a SAVE_EXPR so that we can be sure it will only be referenced
4105 once. Note we must do this before any conversions. */
4106 if (TREE_SIDE_EFFECTS (gnu_result)
4107 && (TREE_CODE (gnu_result_type) == UNCONSTRAINED_ARRAY_TYPE
4108 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type))))
4109 gnu_result = gnat_stabilize_reference (gnu_result, 0);
4111 /* Now convert the result to the proper type. If the type is void or if
4112 we have no result, return error_mark_node to show we have no result.
4113 If the type of the result is correct or if we have a label (which doesn't
4114 have any well-defined type), return our result. Also don't do the
4115 conversion if the "desired" type involves a PLACEHOLDER_EXPR in its size
4116 since those are the cases where the front end may have the type wrong due
4117 to "instantiating" the unconstrained record with discriminant values
4118 or if this is a FIELD_DECL. If this is the Name of an assignment
4119 statement or a parameter of a procedure call, return what we have since
4120 the RHS has to be converted to our type there in that case, unless
4121 GNU_RESULT_TYPE has a simpler size. Similarly, if the two types are
4122 record types with the same name, the expression type has integral mode,
4123 and GNU_RESULT_TYPE BLKmode, don't convert. This will be the case when
4124 we are converting from a packable type to its actual type and we need
4125 those conversions to be NOPs in order for assignments into these types to
4126 work properly if the inner object is a bitfield and hence can't have
4127 its address taken. Finally, don't convert integral types that are the
4128 operand of an unchecked conversion since we need to ignore those
4129 conversions (for 'Valid). Otherwise, convert the result to the proper
4132 if (Present (Parent (gnat_node))
4133 && ((Nkind (Parent (gnat_node)) == N_Assignment_Statement
4134 && Name (Parent (gnat_node)) == gnat_node)
4135 || (Nkind (Parent (gnat_node)) == N_Procedure_Call_Statement
4136 && Name (Parent (gnat_node)) != gnat_node)
4137 || (Nkind (Parent (gnat_node)) == N_Unchecked_Type_Conversion
4138 && !AGGREGATE_TYPE_P (gnu_result_type)
4139 && !AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))
4140 || Nkind (Parent (gnat_node)) == N_Parameter_Association)
4141 && !(TYPE_SIZE (gnu_result_type)
4142 && TYPE_SIZE (TREE_TYPE (gnu_result))
4143 && (AGGREGATE_TYPE_P (gnu_result_type)
4144 == AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))
4145 && ((TREE_CODE (TYPE_SIZE (gnu_result_type)) == INTEGER_CST
4146 && (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_result)))
4148 || (TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST
4149 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type))
4150 && (CONTAINS_PLACEHOLDER_P
4151 (TYPE_SIZE (TREE_TYPE (gnu_result))))))
4152 && !(TREE_CODE (gnu_result_type) == RECORD_TYPE
4153 && TYPE_JUSTIFIED_MODULAR_P (gnu_result_type))))
4155 /* In this case remove padding only if the inner object is of
4156 self-referential size: in that case it must be an object of
4157 unconstrained type with a default discriminant. In other cases,
4158 we want to avoid copying too much data. */
4159 if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
4160 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result))
4161 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE
4162 (TREE_TYPE (TYPE_FIELDS
4163 (TREE_TYPE (gnu_result))))))
4164 gnu_result = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))),
4168 else if (TREE_CODE (gnu_result) == LABEL_DECL
4169 || TREE_CODE (gnu_result) == FIELD_DECL
4170 || TREE_CODE (gnu_result) == ERROR_MARK
4171 || (TYPE_SIZE (gnu_result_type)
4172 && TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST
4173 && TREE_CODE (gnu_result) != INDIRECT_REF
4174 && CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type)))
4175 || ((TYPE_NAME (gnu_result_type)
4176 == TYPE_NAME (TREE_TYPE (gnu_result)))
4177 && TREE_CODE (gnu_result_type) == RECORD_TYPE
4178 && TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
4179 && TYPE_MODE (gnu_result_type) == BLKmode
4180 && (GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (gnu_result)))
4183 /* Remove any padding record, but do nothing more in this case. */
4184 if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
4185 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result)))
4186 gnu_result = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_result))),
4190 else if (gnu_result == error_mark_node
4191 || gnu_result_type == void_type_node)
4192 gnu_result = error_mark_node;
4193 else if (gnu_result_type != TREE_TYPE (gnu_result))
4194 gnu_result = convert (gnu_result_type, gnu_result);
4196 /* We don't need any NOP_EXPR or NON_LVALUE_EXPR on GNU_RESULT. */
4197 while ((TREE_CODE (gnu_result) == NOP_EXPR
4198 || TREE_CODE (gnu_result) == NON_LVALUE_EXPR)
4199 && TREE_TYPE (TREE_OPERAND (gnu_result, 0)) == TREE_TYPE (gnu_result))
4200 gnu_result = TREE_OPERAND (gnu_result, 0);
4205 /* Record the current code position in GNAT_NODE. */
4208 record_code_position (Node_Id gnat_node)
4210 tree stmt_stmt = build1 (STMT_STMT, void_type_node, NULL_TREE);
4212 add_stmt_with_node (stmt_stmt, gnat_node);
4213 save_gnu_tree (gnat_node, stmt_stmt, true);
4216 /* Insert the code for GNAT_NODE at the position saved for that node. */
4219 insert_code_for (Node_Id gnat_node)
4221 STMT_STMT_STMT (get_gnu_tree (gnat_node)) = gnat_to_gnu (gnat_node);
4222 save_gnu_tree (gnat_node, NULL_TREE, true);
4225 /* Start a new statement group chained to the previous group. */
4230 struct stmt_group *group = stmt_group_free_list;
4232 /* First see if we can get one from the free list. */
4234 stmt_group_free_list = group->previous;
4236 group = (struct stmt_group *) ggc_alloc (sizeof (struct stmt_group));
4238 group->previous = current_stmt_group;
4239 group->stmt_list = group->block = group->cleanups = NULL_TREE;
4240 current_stmt_group = group;
4243 /* Add GNU_STMT to the current statement group. */
4246 add_stmt (tree gnu_stmt)
4248 append_to_statement_list (gnu_stmt, ¤t_stmt_group->stmt_list);
4250 /* If we're at top level, show everything in here is in use in case
4251 any of it is shared by a subprogram. */
4252 if (global_bindings_p ())
4253 walk_tree (&gnu_stmt, mark_visited, NULL, NULL);
4257 /* Similar, but set the location of GNU_STMT to that of GNAT_NODE. */
4260 add_stmt_with_node (tree gnu_stmt, Node_Id gnat_node)
4262 if (Present (gnat_node))
4263 annotate_with_node (gnu_stmt, gnat_node);
4264 add_stmt (gnu_stmt);
4267 /* Add a declaration statement for GNU_DECL to the current statement group.
4268 Get SLOC from Entity_Id. */
4271 add_decl_expr (tree gnu_decl, Entity_Id gnat_entity)
4275 /* If this is a variable that Gigi is to ignore, we may have been given
4276 an ERROR_MARK. So test for it. We also might have been given a
4277 reference for a renaming. So only do something for a decl. Also
4278 ignore a TYPE_DECL for an UNCONSTRAINED_ARRAY_TYPE. */
4279 if (!DECL_P (gnu_decl)
4280 || (TREE_CODE (gnu_decl) == TYPE_DECL
4281 && TREE_CODE (TREE_TYPE (gnu_decl)) == UNCONSTRAINED_ARRAY_TYPE))
4284 /* If we are global, we don't want to actually output the DECL_EXPR for
4285 this decl since we already have evaluated the expressions in the
4286 sizes and positions as globals and doing it again would be wrong.
4287 But we do have to mark everything as used. */
4288 gnu_stmt = build1 (DECL_EXPR, void_type_node, gnu_decl);
4289 if (!global_bindings_p ())
4290 add_stmt_with_node (gnu_stmt, gnat_entity);
4293 walk_tree (&gnu_stmt, mark_visited, NULL, NULL);
4294 if (TREE_CODE (gnu_decl) == VAR_DECL
4295 || TREE_CODE (gnu_decl) == CONST_DECL)
4297 walk_tree (&DECL_SIZE (gnu_decl), mark_visited, NULL, NULL);
4298 walk_tree (&DECL_SIZE_UNIT (gnu_decl), mark_visited, NULL, NULL);
4299 walk_tree (&DECL_INITIAL (gnu_decl), mark_visited, NULL, NULL);
4303 /* If this is a DECL_EXPR for a variable with DECL_INITIAL set,
4304 there are two cases we need to handle here. */
4305 if (TREE_CODE (gnu_decl) == VAR_DECL && DECL_INITIAL (gnu_decl))
4307 tree gnu_init = DECL_INITIAL (gnu_decl);
4308 tree gnu_lhs = NULL_TREE;
4310 /* If this is a DECL_EXPR for a variable with DECL_INITIAL set
4311 and decl has a padded type, convert it to the unpadded type so the
4312 assignment is done properly. */
4313 if (TREE_CODE (TREE_TYPE (gnu_decl)) == RECORD_TYPE
4314 && TYPE_IS_PADDING_P (TREE_TYPE (gnu_decl)))
4316 = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_decl))), gnu_decl);
4318 /* Otherwise, if this is going into memory and the initializer isn't
4319 valid for the assembler and loader. Gimplification could do this,
4320 but would be run too late if -fno-unit-at-a-time. */
4321 else if (TREE_STATIC (gnu_decl)
4322 && !initializer_constant_valid_p (gnu_init,
4323 TREE_TYPE (gnu_decl)))
4328 tree gnu_assign_stmt
4329 = build_binary_op (MODIFY_EXPR, NULL_TREE,
4330 gnu_lhs, DECL_INITIAL (gnu_decl));
4332 DECL_INITIAL (gnu_decl) = 0;
4333 TREE_READONLY (gnu_decl) = 0;
4334 annotate_with_locus (gnu_assign_stmt,
4335 DECL_SOURCE_LOCATION (gnu_decl));
4336 add_stmt (gnu_assign_stmt);
4341 /* Utility function to mark nodes with TREE_VISITED and types as having their
4342 sized gimplified. Called from walk_tree. We use this to indicate all
4343 variable sizes and positions in global types may not be shared by any
4347 mark_visited (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
4349 if (TREE_VISITED (*tp))
4352 /* Don't mark a dummy type as visited because we want to mark its sizes
4353 and fields once it's filled in. */
4354 else if (!TYPE_IS_DUMMY_P (*tp))
4355 TREE_VISITED (*tp) = 1;
4358 TYPE_SIZES_GIMPLIFIED (*tp) = 1;
4363 /* Likewise, but to mark as unvisited. */
4366 mark_unvisited (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
4367 void *data ATTRIBUTE_UNUSED)
4369 TREE_VISITED (*tp) = 0;
4374 /* Add GNU_CLEANUP, a cleanup action, to the current code group. */
4377 add_cleanup (tree gnu_cleanup)
4379 append_to_statement_list (gnu_cleanup, ¤t_stmt_group->cleanups);
4382 /* Set the BLOCK node corresponding to the current code group to GNU_BLOCK. */
4385 set_block_for_group (tree gnu_block)
4387 gcc_assert (!current_stmt_group->block);
4388 current_stmt_group->block = gnu_block;
4391 /* Return code corresponding to the current code group. It is normally
4392 a STATEMENT_LIST, but may also be a BIND_EXPR or TRY_FINALLY_EXPR if
4393 BLOCK or cleanups were set. */
4398 struct stmt_group *group = current_stmt_group;
4399 tree gnu_retval = group->stmt_list;
4401 /* If this is a null list, allocate a new STATEMENT_LIST. Then, if there
4402 are cleanups, make a TRY_FINALLY_EXPR. Last, if there is a BLOCK,
4403 make a BIND_EXPR. Note that we nest in that because the cleanup may
4404 reference variables in the block. */
4405 if (gnu_retval == NULL_TREE)
4406 gnu_retval = alloc_stmt_list ();
4408 if (group->cleanups)
4409 gnu_retval = build2 (TRY_FINALLY_EXPR, void_type_node, gnu_retval,
4412 if (current_stmt_group->block)
4413 gnu_retval = build3 (BIND_EXPR, void_type_node, BLOCK_VARS (group->block),
4414 gnu_retval, group->block);
4416 /* Remove this group from the stack and add it to the free list. */
4417 current_stmt_group = group->previous;
4418 group->previous = stmt_group_free_list;
4419 stmt_group_free_list = group;
4424 /* Add a list of statements from GNAT_LIST, a possibly-empty list of
4428 add_stmt_list (List_Id gnat_list)
4432 if (Present (gnat_list))
4433 for (gnat_node = First (gnat_list); Present (gnat_node);
4434 gnat_node = Next (gnat_node))
4435 add_stmt (gnat_to_gnu (gnat_node));
4438 /* Build a tree from GNAT_LIST, a possibly-empty list of statements.
4439 If BINDING_P is true, push and pop a binding level around the list. */
4442 build_stmt_group (List_Id gnat_list, bool binding_p)
4444 start_stmt_group ();
4448 add_stmt_list (gnat_list);
4452 return end_stmt_group ();
4455 /* Push and pop routines for stacks. We keep a free list around so we
4456 don't waste tree nodes. */
4459 push_stack (tree *gnu_stack_ptr, tree gnu_purpose, tree gnu_value)
4461 tree gnu_node = gnu_stack_free_list;
4465 gnu_stack_free_list = TREE_CHAIN (gnu_node);
4466 TREE_CHAIN (gnu_node) = *gnu_stack_ptr;
4467 TREE_PURPOSE (gnu_node) = gnu_purpose;
4468 TREE_VALUE (gnu_node) = gnu_value;
4471 gnu_node = tree_cons (gnu_purpose, gnu_value, *gnu_stack_ptr);
4473 *gnu_stack_ptr = gnu_node;
4477 pop_stack (tree *gnu_stack_ptr)
4479 tree gnu_node = *gnu_stack_ptr;
4481 *gnu_stack_ptr = TREE_CHAIN (gnu_node);
4482 TREE_CHAIN (gnu_node) = gnu_stack_free_list;
4483 gnu_stack_free_list = gnu_node;
4486 /* GNU_STMT is a statement. We generate code for that statement. */
4489 gnat_expand_stmt (tree gnu_stmt)
4492 tree gnu_elmt, gnu_elmt_2;
4495 switch (TREE_CODE (gnu_stmt))
4499 /* First write a volatile ASM_INPUT to prevent anything from being
4501 gnu_elmt = gen_rtx_ASM_INPUT (VOIDmode, "");
4502 MEM_VOLATILE_P (gnu_elmt) = 1;
4503 emit_insn (gnu_elmt);
4505 gnu_elmt = expand_expr (TREE_OPERAND (gnu_stmt, 0), NULL_RTX, VOIDmode,
4507 emit_insn (gen_rtx_USE (VOIDmode, ));
4516 /* Generate GIMPLE in place for the expression at *EXPR_P. */
4519 gnat_gimplify_expr (tree *expr_p, tree *pre_p, tree *post_p ATTRIBUTE_UNUSED)
4521 tree expr = *expr_p;
4523 if (IS_ADA_STMT (expr))
4524 return gnat_gimplify_stmt (expr_p);
4526 switch (TREE_CODE (expr))
4529 /* If this is for a scalar, just make a VAR_DECL for it. If for
4530 an aggregate, get a null pointer of the appropriate type and
4532 if (AGGREGATE_TYPE_P (TREE_TYPE (expr)))
4533 *expr_p = build1 (INDIRECT_REF, TREE_TYPE (expr),
4534 convert (build_pointer_type (TREE_TYPE (expr)),
4535 integer_zero_node));
4538 *expr_p = create_tmp_var (TREE_TYPE (expr), NULL);
4539 TREE_NO_WARNING (*expr_p) = 1;
4542 append_to_statement_list (TREE_OPERAND (expr, 0), pre_p);
4545 case UNCONSTRAINED_ARRAY_REF:
4546 /* We should only do this if we are just elaborating for side-effects,
4547 but we can't know that yet. */
4548 *expr_p = TREE_OPERAND (*expr_p, 0);
4552 /* If we're taking the address of a constant CONSTRUCTOR, force it to
4553 be put into static memory. We know it's going to be readonly given
4554 the semantics we have and it's required to be static memory in
4555 the case when the reference is in an elaboration procedure. */
4556 if (TREE_CODE (TREE_OPERAND (expr, 0)) == CONSTRUCTOR
4557 && TREE_CONSTANT (TREE_OPERAND (expr, 0)))
4560 = create_tmp_var (TREE_TYPE (TREE_OPERAND (expr, 0)), "C");
4562 TREE_READONLY (new_var) = 1;
4563 TREE_STATIC (new_var) = 1;
4564 TREE_ADDRESSABLE (new_var) = 1;
4565 DECL_INITIAL (new_var) = TREE_OPERAND (expr, 0);
4567 TREE_OPERAND (expr, 0) = new_var;
4568 recompute_tree_invarant_for_addr_expr (expr);
4571 return GS_UNHANDLED;
4574 /* We have a kludge here. If the FIELD_DECL is from a fat pointer and is
4575 from an early dummy type, replace it with the proper FIELD_DECL. */
4576 if (TYPE_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (*expr_p, 0)))
4577 && DECL_ORIGINAL_FIELD (TREE_OPERAND (*expr_p, 1)))
4579 TREE_OPERAND (*expr_p, 1)
4580 = DECL_ORIGINAL_FIELD (TREE_OPERAND (*expr_p, 1));
4584 /* ... fall through ... */
4587 return GS_UNHANDLED;
4591 /* Generate GIMPLE in place for the statement at *STMT_P. */
4593 static enum gimplify_status
4594 gnat_gimplify_stmt (tree *stmt_p)
4596 tree stmt = *stmt_p;
4598 switch (TREE_CODE (stmt))
4601 *stmt_p = STMT_STMT_STMT (stmt);
4605 *stmt_p = NULL_TREE;
4610 tree gnu_start_label = create_artificial_label ();
4611 tree gnu_end_label = LOOP_STMT_LABEL (stmt);
4613 /* Set to emit the statements of the loop. */
4614 *stmt_p = NULL_TREE;
4616 /* We first emit the start label and then a conditional jump to
4617 the end label if there's a top condition, then the body of the
4618 loop, then a conditional branch to the end label, then the update,
4619 if any, and finally a jump to the start label and the definition
4620 of the end label. */
4621 append_to_statement_list (build1 (LABEL_EXPR, void_type_node,
4625 if (LOOP_STMT_TOP_COND (stmt))
4626 append_to_statement_list (build3 (COND_EXPR, void_type_node,
4627 LOOP_STMT_TOP_COND (stmt),
4634 append_to_statement_list (LOOP_STMT_BODY (stmt), stmt_p);
4636 if (LOOP_STMT_BOT_COND (stmt))
4637 append_to_statement_list (build3 (COND_EXPR, void_type_node,
4638 LOOP_STMT_BOT_COND (stmt),
4645 if (LOOP_STMT_UPDATE (stmt))
4646 append_to_statement_list (LOOP_STMT_UPDATE (stmt), stmt_p);
4648 append_to_statement_list (build1 (GOTO_EXPR, void_type_node,
4651 append_to_statement_list (build1 (LABEL_EXPR, void_type_node,
4658 /* Build a statement to jump to the corresponding end label, then
4659 see if it needs to be conditional. */
4660 *stmt_p = build1 (GOTO_EXPR, void_type_node, EXIT_STMT_LABEL (stmt));
4661 if (EXIT_STMT_COND (stmt))
4662 *stmt_p = build3 (COND_EXPR, void_type_node,
4663 EXIT_STMT_COND (stmt), *stmt_p, alloc_stmt_list ());
4671 /* Force references to each of the entities in packages GNAT_NODE with's
4672 so that the debugging information for all of them are identical
4673 in all clients. Operate recursively on anything it with's, but check
4674 that we aren't elaborating something more than once. */
4676 /* The reason for this routine's existence is two-fold.
4677 First, with some debugging formats, notably MDEBUG on SGI
4678 IRIX, the linker will remove duplicate debugging information if two
4679 clients have identical debugguing information. With the normal scheme
4680 of elaboration, this does not usually occur, since entities in with'ed
4681 packages are elaborated on demand, and if clients have different usage
4682 patterns, the normal case, then the order and selection of entities
4683 will differ. In most cases however, it seems that linkers do not know
4684 how to eliminate duplicate debugging information, even if it is
4685 identical, so the use of this routine would increase the total amount
4686 of debugging information in the final executable.
4688 Second, this routine is called in type_annotate mode, to compute DDA
4689 information for types in withed units, for ASIS use */
4692 elaborate_all_entities (Node_Id gnat_node)
4694 Entity_Id gnat_with_clause, gnat_entity;
4696 /* Process each unit only once. As we trace the context of all relevant
4697 units transitively, including generic bodies, we may encounter the
4698 same generic unit repeatedly */
4700 if (!present_gnu_tree (gnat_node))
4701 save_gnu_tree (gnat_node, integer_zero_node, true);
4703 /* Save entities in all context units. A body may have an implicit_with
4704 on its own spec, if the context includes a child unit, so don't save
4707 for (gnat_with_clause = First (Context_Items (gnat_node));
4708 Present (gnat_with_clause);
4709 gnat_with_clause = Next (gnat_with_clause))
4710 if (Nkind (gnat_with_clause) == N_With_Clause
4711 && !present_gnu_tree (Library_Unit (gnat_with_clause))
4712 && Library_Unit (gnat_with_clause) != Library_Unit (Cunit (Main_Unit)))
4714 elaborate_all_entities (Library_Unit (gnat_with_clause));
4716 if (Ekind (Entity (Name (gnat_with_clause))) == E_Package)
4718 for (gnat_entity = First_Entity (Entity (Name (gnat_with_clause)));
4719 Present (gnat_entity);
4720 gnat_entity = Next_Entity (gnat_entity))
4721 if (Is_Public (gnat_entity)
4722 && Convention (gnat_entity) != Convention_Intrinsic
4723 && Ekind (gnat_entity) != E_Package
4724 && Ekind (gnat_entity) != E_Package_Body
4725 && Ekind (gnat_entity) != E_Operator
4726 && !(IN (Ekind (gnat_entity), Type_Kind)
4727 && !Is_Frozen (gnat_entity))
4728 && !((Ekind (gnat_entity) == E_Procedure
4729 || Ekind (gnat_entity) == E_Function)
4730 && Is_Intrinsic_Subprogram (gnat_entity))
4731 && !IN (Ekind (gnat_entity), Named_Kind)
4732 && !IN (Ekind (gnat_entity), Generic_Unit_Kind))
4733 gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4735 else if (Ekind (Entity (Name (gnat_with_clause))) == E_Generic_Package)
4738 = Corresponding_Body (Unit (Library_Unit (gnat_with_clause)));
4740 /* Retrieve compilation unit node of generic body. */
4741 while (Present (gnat_body)
4742 && Nkind (gnat_body) != N_Compilation_Unit)
4743 gnat_body = Parent (gnat_body);
4745 /* If body is available, elaborate its context. */
4746 if (Present (gnat_body))
4747 elaborate_all_entities (gnat_body);
4751 if (Nkind (Unit (gnat_node)) == N_Package_Body && type_annotate_only)
4752 elaborate_all_entities (Library_Unit (gnat_node));
4755 /* Do the processing of N_Freeze_Entity, GNAT_NODE. */
4758 process_freeze_entity (Node_Id gnat_node)
4760 Entity_Id gnat_entity = Entity (gnat_node);
4764 = (Nkind (Declaration_Node (gnat_entity)) == N_Object_Declaration
4765 && present_gnu_tree (Declaration_Node (gnat_entity)))
4766 ? get_gnu_tree (Declaration_Node (gnat_entity)) : NULL_TREE;
4768 /* If this is a package, need to generate code for the package. */
4769 if (Ekind (gnat_entity) == E_Package)
4772 (Parent (Corresponding_Body
4773 (Parent (Declaration_Node (gnat_entity)))));
4777 /* Check for old definition after the above call. This Freeze_Node
4778 might be for one its Itypes. */
4780 = present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity) : 0;
4782 /* If this entity has an Address representation clause, GNU_OLD is the
4783 address, so discard it here. */
4784 if (Present (Address_Clause (gnat_entity)))
4787 /* Don't do anything for class-wide types they are always
4788 transformed into their root type. */
4789 if (Ekind (gnat_entity) == E_Class_Wide_Type
4790 || (Ekind (gnat_entity) == E_Class_Wide_Subtype
4791 && Present (Equivalent_Type (gnat_entity))))
4794 /* Don't do anything for subprograms that may have been elaborated before
4795 their freeze nodes. This can happen, for example because of an inner call
4796 in an instance body, or a previous compilation of a spec for inlining
4799 && TREE_CODE (gnu_old) == FUNCTION_DECL
4800 && (Ekind (gnat_entity) == E_Function
4801 || Ekind (gnat_entity) == E_Procedure))
4803 && (TREE_CODE (TREE_TYPE (gnu_old)) == FUNCTION_TYPE
4804 && Ekind (gnat_entity) == E_Subprogram_Type)))
4807 /* If we have a non-dummy type old tree, we have nothing to do. Unless
4808 this is the public view of a private type whose full view was not
4809 delayed, this node was never delayed as it should have been.
4810 Also allow this to happen for concurrent types since we may have
4811 frozen both the Corresponding_Record_Type and this type. */
4813 && !(TREE_CODE (gnu_old) == TYPE_DECL
4814 && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old))))
4816 gcc_assert ((IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
4817 && Present (Full_View (gnat_entity))
4818 && No (Freeze_Node (Full_View (gnat_entity))))
4819 || Is_Concurrent_Type (gnat_entity));
4823 /* Reset the saved tree, if any, and elaborate the object or type for real.
4824 If there is a full declaration, elaborate it and copy the type to
4825 GNAT_ENTITY. Likewise if this is the record subtype corresponding to
4826 a class wide type or subtype. */
4829 save_gnu_tree (gnat_entity, NULL_TREE, false);
4830 if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
4831 && Present (Full_View (gnat_entity))
4832 && present_gnu_tree (Full_View (gnat_entity)))
4833 save_gnu_tree (Full_View (gnat_entity), NULL_TREE, false);
4834 if (Present (Class_Wide_Type (gnat_entity))
4835 && Class_Wide_Type (gnat_entity) != gnat_entity)
4836 save_gnu_tree (Class_Wide_Type (gnat_entity), NULL_TREE, false);
4839 if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
4840 && Present (Full_View (gnat_entity)))
4842 gnu_new = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 1);
4844 /* Propagate back-annotations from full view to partial view. */
4845 if (Unknown_Alignment (gnat_entity))
4846 Set_Alignment (gnat_entity, Alignment (Full_View (gnat_entity)));
4848 if (Unknown_Esize (gnat_entity))
4849 Set_Esize (gnat_entity, Esize (Full_View (gnat_entity)));
4851 if (Unknown_RM_Size (gnat_entity))
4852 Set_RM_Size (gnat_entity, RM_Size (Full_View (gnat_entity)));
4854 /* The above call may have defined this entity (the simplest example
4855 of this is when we have a private enumeral type since the bounds
4856 will have the public view. */
4857 if (!present_gnu_tree (gnat_entity))
4858 save_gnu_tree (gnat_entity, gnu_new, false);
4859 if (Present (Class_Wide_Type (gnat_entity))
4860 && Class_Wide_Type (gnat_entity) != gnat_entity)
4861 save_gnu_tree (Class_Wide_Type (gnat_entity), gnu_new, false);
4864 gnu_new = gnat_to_gnu_entity (gnat_entity, gnu_init, 1);
4866 /* If we've made any pointers to the old version of this type, we
4867 have to update them. */
4869 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)),
4870 TREE_TYPE (gnu_new));
4873 /* Process the list of inlined subprograms of GNAT_NODE, which is an
4874 N_Compilation_Unit. */
4877 process_inlined_subprograms (Node_Id gnat_node)
4879 Entity_Id gnat_entity;
4882 /* If we can inline, generate RTL for all the inlined subprograms.
4883 Define the entity first so we set DECL_EXTERNAL. */
4884 if (optimize > 0 && !flag_really_no_inline)
4885 for (gnat_entity = First_Inlined_Subprogram (gnat_node);
4886 Present (gnat_entity);
4887 gnat_entity = Next_Inlined_Subprogram (gnat_entity))
4889 gnat_body = Parent (Declaration_Node (gnat_entity));
4891 if (Nkind (gnat_body) != N_Subprogram_Body)
4893 /* ??? This really should always be Present. */
4894 if (No (Corresponding_Body (gnat_body)))
4898 = Parent (Declaration_Node (Corresponding_Body (gnat_body)));
4901 if (Present (gnat_body))
4903 gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
4904 add_stmt (gnat_to_gnu (gnat_body));
4909 /* Elaborate decls in the lists GNAT_DECLS and GNAT_DECLS2, if present.
4910 We make two passes, one to elaborate anything other than bodies (but
4911 we declare a function if there was no spec). The second pass
4912 elaborates the bodies.
4914 GNAT_END_LIST gives the element in the list past the end. Normally,
4915 this is Empty, but can be First_Real_Statement for a
4916 Handled_Sequence_Of_Statements.
4918 We make a complete pass through both lists if PASS1P is true, then make
4919 the second pass over both lists if PASS2P is true. The lists usually
4920 correspond to the public and private parts of a package. */
4923 process_decls (List_Id gnat_decls, List_Id gnat_decls2,
4924 Node_Id gnat_end_list, bool pass1p, bool pass2p)
4926 List_Id gnat_decl_array[2];
4930 gnat_decl_array[0] = gnat_decls, gnat_decl_array[1] = gnat_decls2;
4933 for (i = 0; i <= 1; i++)
4934 if (Present (gnat_decl_array[i]))
4935 for (gnat_decl = First (gnat_decl_array[i]);
4936 gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl))
4938 /* For package specs, we recurse inside the declarations,
4939 thus taking the two pass approach inside the boundary. */
4940 if (Nkind (gnat_decl) == N_Package_Declaration
4941 && (Nkind (Specification (gnat_decl)
4942 == N_Package_Specification)))
4943 process_decls (Visible_Declarations (Specification (gnat_decl)),
4944 Private_Declarations (Specification (gnat_decl)),
4945 Empty, true, false);
4947 /* Similarly for any declarations in the actions of a
4949 else if (Nkind (gnat_decl) == N_Freeze_Entity)
4951 process_freeze_entity (gnat_decl);
4952 process_decls (Actions (gnat_decl), Empty, Empty, true, false);
4955 /* Package bodies with freeze nodes get their elaboration deferred
4956 until the freeze node, but the code must be placed in the right
4957 place, so record the code position now. */
4958 else if (Nkind (gnat_decl) == N_Package_Body
4959 && Present (Freeze_Node (Corresponding_Spec (gnat_decl))))
4960 record_code_position (gnat_decl);
4962 else if (Nkind (gnat_decl) == N_Package_Body_Stub
4963 && Present (Library_Unit (gnat_decl))
4964 && Present (Freeze_Node
4967 (Library_Unit (gnat_decl)))))))
4968 record_code_position
4969 (Proper_Body (Unit (Library_Unit (gnat_decl))));
4971 /* We defer most subprogram bodies to the second pass. */
4972 else if (Nkind (gnat_decl) == N_Subprogram_Body)
4974 if (Acts_As_Spec (gnat_decl))
4976 Node_Id gnat_subprog_id = Defining_Entity (gnat_decl);
4978 if (Ekind (gnat_subprog_id) != E_Generic_Procedure
4979 && Ekind (gnat_subprog_id) != E_Generic_Function)
4980 gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, 1);
4983 /* For bodies and stubs that act as their own specs, the entity
4984 itself must be elaborated in the first pass, because it may
4985 be used in other declarations. */
4986 else if (Nkind (gnat_decl) == N_Subprogram_Body_Stub)
4988 Node_Id gnat_subprog_id =
4989 Defining_Entity (Specification (gnat_decl));
4991 if (Ekind (gnat_subprog_id) != E_Subprogram_Body
4992 && Ekind (gnat_subprog_id) != E_Generic_Procedure
4993 && Ekind (gnat_subprog_id) != E_Generic_Function)
4994 gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, 1);
4997 /* Concurrent stubs stand for the corresponding subprogram bodies,
4998 which are deferred like other bodies. */
4999 else if (Nkind (gnat_decl) == N_Task_Body_Stub
5000 || Nkind (gnat_decl) == N_Protected_Body_Stub)
5003 add_stmt (gnat_to_gnu (gnat_decl));
5006 /* Here we elaborate everything we deferred above except for package bodies,
5007 which are elaborated at their freeze nodes. Note that we must also
5008 go inside things (package specs and freeze nodes) the first pass did. */
5010 for (i = 0; i <= 1; i++)
5011 if (Present (gnat_decl_array[i]))
5012 for (gnat_decl = First (gnat_decl_array[i]);
5013 gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl))
5015 if (Nkind (gnat_decl) == N_Subprogram_Body
5016 || Nkind (gnat_decl) == N_Subprogram_Body_Stub
5017 || Nkind (gnat_decl) == N_Task_Body_Stub
5018 || Nkind (gnat_decl) == N_Protected_Body_Stub)
5019 add_stmt (gnat_to_gnu (gnat_decl));
5021 else if (Nkind (gnat_decl) == N_Package_Declaration
5022 && (Nkind (Specification (gnat_decl)
5023 == N_Package_Specification)))
5024 process_decls (Visible_Declarations (Specification (gnat_decl)),
5025 Private_Declarations (Specification (gnat_decl)),
5026 Empty, false, true);
5028 else if (Nkind (gnat_decl) == N_Freeze_Entity)
5029 process_decls (Actions (gnat_decl), Empty, Empty, false, true);
5033 /* Emit code for a range check. GNU_EXPR is the expression to be checked,
5034 GNAT_RANGE_TYPE the gnat type or subtype containing the bounds against
5035 which we have to check. */
5038 emit_range_check (tree gnu_expr, Entity_Id gnat_range_type)
5040 tree gnu_range_type = get_unpadded_type (gnat_range_type);
5041 tree gnu_low = TYPE_MIN_VALUE (gnu_range_type);
5042 tree gnu_high = TYPE_MAX_VALUE (gnu_range_type);
5043 tree gnu_compare_type = get_base_type (TREE_TYPE (gnu_expr));
5045 /* If GNU_EXPR has an integral type that is narrower than GNU_RANGE_TYPE,
5046 we can't do anything since we might be truncating the bounds. No
5047 check is needed in this case. */
5048 if (INTEGRAL_TYPE_P (TREE_TYPE (gnu_expr))
5049 && (TYPE_PRECISION (gnu_compare_type)
5050 < TYPE_PRECISION (get_base_type (gnu_range_type))))
5053 /* Checked expressions must be evaluated only once. */
5054 gnu_expr = protect_multiple_eval (gnu_expr);
5056 /* There's no good type to use here, so we might as well use
5057 integer_type_node. Note that the form of the check is
5058 (not (expr >= lo)) or (not (expr >= hi))
5059 the reason for this slightly convoluted form is that NaN's
5060 are not considered to be in range in the float case. */
5062 (build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
5064 (build_binary_op (GE_EXPR, integer_type_node,
5065 convert (gnu_compare_type, gnu_expr),
5066 convert (gnu_compare_type, gnu_low))),
5068 (build_binary_op (LE_EXPR, integer_type_node,
5069 convert (gnu_compare_type, gnu_expr),
5070 convert (gnu_compare_type,
5072 gnu_expr, CE_Range_Check_Failed);
5075 /* Emit code for an index check. GNU_ARRAY_OBJECT is the array object
5076 which we are about to index, GNU_EXPR is the index expression to be
5077 checked, GNU_LOW and GNU_HIGH are the lower and upper bounds
5078 against which GNU_EXPR has to be checked. Note that for index
5079 checking we cannot use the emit_range_check function (although very
5080 similar code needs to be generated in both cases) since for index
5081 checking the array type against which we are checking the indeces
5082 may be unconstrained and consequently we need to retrieve the
5083 actual index bounds from the array object itself
5084 (GNU_ARRAY_OBJECT). The place where we need to do that is in
5085 subprograms having unconstrained array formal parameters */
5088 emit_index_check (tree gnu_array_object,
5093 tree gnu_expr_check;
5095 /* Checked expressions must be evaluated only once. */
5096 gnu_expr = protect_multiple_eval (gnu_expr);
5098 /* Must do this computation in the base type in case the expression's
5099 type is an unsigned subtypes. */
5100 gnu_expr_check = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
5102 /* If GNU_LOW or GNU_HIGH are a PLACEHOLDER_EXPR, qualify them by
5103 the object we are handling. */
5104 gnu_low = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_low, gnu_array_object);
5105 gnu_high = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_high, gnu_array_object);
5107 /* There's no good type to use here, so we might as well use
5108 integer_type_node. */
5110 (build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
5111 build_binary_op (LT_EXPR, integer_type_node,
5113 convert (TREE_TYPE (gnu_expr_check),
5115 build_binary_op (GT_EXPR, integer_type_node,
5117 convert (TREE_TYPE (gnu_expr_check),
5119 gnu_expr, CE_Index_Check_Failed);
5122 /* GNU_COND contains the condition corresponding to an access, discriminant or
5123 range check of value GNU_EXPR. Build a COND_EXPR that returns GNU_EXPR if
5124 GNU_COND is false and raises a CONSTRAINT_ERROR if GNU_COND is true.
5125 REASON is the code that says why the exception was raised. */
5128 emit_check (tree gnu_cond, tree gnu_expr, int reason)
5133 gnu_call = build_call_raise (reason);
5135 /* Use an outer COMPOUND_EXPR to make sure that GNU_EXPR will get evaluated
5136 in front of the comparison in case it ends up being a SAVE_EXPR. Put the
5137 whole thing inside its own SAVE_EXPR so the inner SAVE_EXPR doesn't leak
5139 gnu_result = fold (build3 (COND_EXPR, TREE_TYPE (gnu_expr), gnu_cond,
5140 build2 (COMPOUND_EXPR, TREE_TYPE (gnu_expr),
5141 gnu_call, gnu_expr),
5144 /* If GNU_EXPR has side effects, make the outer COMPOUND_EXPR and
5145 protect it. Otherwise, show GNU_RESULT has no side effects: we
5146 don't need to evaluate it just for the check. */
5147 if (TREE_SIDE_EFFECTS (gnu_expr))
5149 = build2 (COMPOUND_EXPR, TREE_TYPE (gnu_expr), gnu_expr, gnu_result);
5151 TREE_SIDE_EFFECTS (gnu_result) = 0;
5153 /* ??? Unfortunately, if we don't put a SAVE_EXPR around this whole thing,
5154 we will repeatedly do the test. It would be nice if GCC was able
5155 to optimize this and only do it once. */
5156 return save_expr (gnu_result);
5159 /* Return an expression that converts GNU_EXPR to GNAT_TYPE, doing
5160 overflow checks if OVERFLOW_P is nonzero and range checks if
5161 RANGE_P is nonzero. GNAT_TYPE is known to be an integral type.
5162 If TRUNCATE_P is nonzero, do a float to integer conversion with
5163 truncation; otherwise round. */
5166 convert_with_check (Entity_Id gnat_type, tree gnu_expr, bool overflowp,
5167 bool rangep, bool truncatep)
5169 tree gnu_type = get_unpadded_type (gnat_type);
5170 tree gnu_in_type = TREE_TYPE (gnu_expr);
5171 tree gnu_in_basetype = get_base_type (gnu_in_type);
5172 tree gnu_base_type = get_base_type (gnu_type);
5173 tree gnu_ada_base_type = get_ada_base_type (gnu_type);
5174 tree gnu_result = gnu_expr;
5176 /* If we are not doing any checks, the output is an integral type, and
5177 the input is not a floating type, just do the conversion. This
5178 shortcut is required to avoid problems with packed array types
5179 and simplifies code in all cases anyway. */
5180 if (!rangep && !overflowp && INTEGRAL_TYPE_P (gnu_base_type)
5181 && !FLOAT_TYPE_P (gnu_in_type))
5182 return convert (gnu_type, gnu_expr);
5184 /* First convert the expression to its base type. This
5185 will never generate code, but makes the tests below much simpler.
5186 But don't do this if converting from an integer type to an unconstrained
5187 array type since then we need to get the bounds from the original
5189 if (TREE_CODE (gnu_type) != UNCONSTRAINED_ARRAY_TYPE)
5190 gnu_result = convert (gnu_in_basetype, gnu_result);
5192 /* If overflow checks are requested, we need to be sure the result will
5193 fit in the output base type. But don't do this if the input
5194 is integer and the output floating-point. */
5196 && !(FLOAT_TYPE_P (gnu_base_type) && INTEGRAL_TYPE_P (gnu_in_basetype)))
5198 /* Ensure GNU_EXPR only gets evaluated once. */
5199 tree gnu_input = protect_multiple_eval (gnu_result);
5200 tree gnu_cond = integer_zero_node;
5201 tree gnu_in_lb = TYPE_MIN_VALUE (gnu_in_basetype);
5202 tree gnu_in_ub = TYPE_MAX_VALUE (gnu_in_basetype);
5203 tree gnu_out_lb = TYPE_MIN_VALUE (gnu_base_type);
5204 tree gnu_out_ub = TYPE_MAX_VALUE (gnu_base_type);
5206 /* Convert the lower bounds to signed types, so we're sure we're
5207 comparing them properly. Likewise, convert the upper bounds
5208 to unsigned types. */
5209 if (INTEGRAL_TYPE_P (gnu_in_basetype) && TYPE_UNSIGNED (gnu_in_basetype))
5210 gnu_in_lb = convert (gnat_signed_type (gnu_in_basetype), gnu_in_lb);
5212 if (INTEGRAL_TYPE_P (gnu_in_basetype)
5213 && !TYPE_UNSIGNED (gnu_in_basetype))
5214 gnu_in_ub = convert (gnat_unsigned_type (gnu_in_basetype), gnu_in_ub);
5216 if (INTEGRAL_TYPE_P (gnu_base_type) && TYPE_UNSIGNED (gnu_base_type))
5217 gnu_out_lb = convert (gnat_signed_type (gnu_base_type), gnu_out_lb);
5219 if (INTEGRAL_TYPE_P (gnu_base_type) && !TYPE_UNSIGNED (gnu_base_type))
5220 gnu_out_ub = convert (gnat_unsigned_type (gnu_base_type), gnu_out_ub);
5222 /* Check each bound separately and only if the result bound
5223 is tighter than the bound on the input type. Note that all the
5224 types are base types, so the bounds must be constant. Also,
5225 the comparison is done in the base type of the input, which
5226 always has the proper signedness. First check for input
5227 integer (which means output integer), output float (which means
5228 both float), or mixed, in which case we always compare.
5229 Note that we have to do the comparison which would *fail* in the
5230 case of an error since if it's an FP comparison and one of the
5231 values is a NaN or Inf, the comparison will fail. */
5232 if (INTEGRAL_TYPE_P (gnu_in_basetype)
5233 ? tree_int_cst_lt (gnu_in_lb, gnu_out_lb)
5234 : (FLOAT_TYPE_P (gnu_base_type)
5235 ? REAL_VALUES_LESS (TREE_REAL_CST (gnu_in_lb),
5236 TREE_REAL_CST (gnu_out_lb))
5240 (build_binary_op (GE_EXPR, integer_type_node,
5241 gnu_input, convert (gnu_in_basetype,
5244 if (INTEGRAL_TYPE_P (gnu_in_basetype)
5245 ? tree_int_cst_lt (gnu_out_ub, gnu_in_ub)
5246 : (FLOAT_TYPE_P (gnu_base_type)
5247 ? REAL_VALUES_LESS (TREE_REAL_CST (gnu_out_ub),
5248 TREE_REAL_CST (gnu_in_lb))
5251 = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node, gnu_cond,
5253 (build_binary_op (LE_EXPR, integer_type_node,
5255 convert (gnu_in_basetype,
5258 if (!integer_zerop (gnu_cond))
5259 gnu_result = emit_check (gnu_cond, gnu_input,
5260 CE_Overflow_Check_Failed);
5263 /* Now convert to the result base type. If this is a non-truncating
5264 float-to-integer conversion, round. */
5265 if (INTEGRAL_TYPE_P (gnu_ada_base_type) && FLOAT_TYPE_P (gnu_in_basetype)
5268 REAL_VALUE_TYPE half_minus_pred_half, pred_half;
5269 tree gnu_conv, gnu_zero, gnu_comp, gnu_saved_result, calc_type;
5270 tree gnu_pred_half, gnu_add_pred_half, gnu_subtract_pred_half;
5271 const struct real_format *fmt;
5273 /* The following calculations depend on proper rounding to even
5274 of each arithmetic operation. In order to prevent excess
5275 precision from spoiling this property, use the widest hardware
5276 floating-point type.
5278 FIXME: For maximum efficiency, this should only be done for machines
5279 and types where intermediates may have extra precision. */
5281 calc_type = longest_float_type_node;
5282 /* FIXME: Should not have padding in the first place */
5283 if (TREE_CODE (calc_type) == RECORD_TYPE
5284 && TYPE_IS_PADDING_P (calc_type))
5285 calc_type = TREE_TYPE (TYPE_FIELDS (calc_type));
5287 /* Compute the exact value calc_type'Pred (0.5) at compile time. */
5288 fmt = REAL_MODE_FORMAT (TYPE_MODE (calc_type));
5289 real_2expN (&half_minus_pred_half, -(fmt->p) - 1);
5290 REAL_ARITHMETIC (pred_half, MINUS_EXPR, dconsthalf,
5291 half_minus_pred_half);
5292 gnu_pred_half = build_real (calc_type, pred_half);
5294 /* If the input is strictly negative, subtract this value
5295 and otherwise add it from the input. For 0.5, the result
5296 is exactly between 1.0 and the machine number preceding 1.0
5297 (for calc_type). Since the last bit of 1.0 is even, this 0.5
5298 will round to 1.0, while all other number with an absolute
5299 value less than 0.5 round to 0.0. For larger numbers exactly
5300 halfway between integers, rounding will always be correct as
5301 the true mathematical result will be closer to the higher
5302 integer compared to the lower one. So, this constant works
5303 for all floating-point numbers.
5305 The reason to use the same constant with subtract/add instead
5306 of a positive and negative constant is to allow the comparison
5307 to be scheduled in parallel with retrieval of the constant and
5308 conversion of the input to the calc_type (if necessary).
5311 gnu_zero = convert (gnu_in_basetype, integer_zero_node);
5312 gnu_saved_result = save_expr (gnu_result);
5313 gnu_conv = convert (calc_type, gnu_saved_result);
5314 gnu_comp = build2 (GE_EXPR, integer_type_node,
5315 gnu_saved_result, gnu_zero);
5317 = build2 (PLUS_EXPR, calc_type, gnu_conv, gnu_pred_half);
5318 gnu_subtract_pred_half
5319 = build2 (MINUS_EXPR, calc_type, gnu_conv, gnu_pred_half);
5320 gnu_result = build3 (COND_EXPR, calc_type, gnu_comp,
5321 gnu_add_pred_half, gnu_subtract_pred_half);
5324 if (TREE_CODE (gnu_ada_base_type) == INTEGER_TYPE
5325 && TYPE_HAS_ACTUAL_BOUNDS_P (gnu_ada_base_type)
5326 && TREE_CODE (gnu_result) == UNCONSTRAINED_ARRAY_REF)
5327 gnu_result = unchecked_convert (gnu_ada_base_type, gnu_result, false);
5329 gnu_result = convert (gnu_ada_base_type, gnu_result);
5331 /* Finally, do the range check if requested. Note that if the
5332 result type is a modular type, the range check is actually
5333 an overflow check. */
5336 || (TREE_CODE (gnu_base_type) == INTEGER_TYPE
5337 && TYPE_MODULAR_P (gnu_base_type) && overflowp))
5338 gnu_result = emit_range_check (gnu_result, gnat_type);
5340 return convert (gnu_type, gnu_result);
5343 /* Return 1 if GNU_EXPR can be directly addressed. This is the case unless
5344 it is an expression involving computation or if it involves a reference
5345 to a bitfield or to a field not sufficiently aligned for its type. */
5348 addressable_p (tree gnu_expr)
5350 switch (TREE_CODE (gnu_expr))
5356 /* All DECLs are addressable: if they are in a register, we can force
5360 case UNCONSTRAINED_ARRAY_REF:
5368 return (!DECL_BIT_FIELD (TREE_OPERAND (gnu_expr, 1))
5369 && (!STRICT_ALIGNMENT
5370 /* If the field was marked as "semantically" addressable
5371 in create_field_decl, we are guaranteed that it can
5372 be directly addressed. */
5373 || !DECL_NONADDRESSABLE_P (TREE_OPERAND (gnu_expr, 1))
5374 /* Otherwise it can nevertheless be directly addressed
5375 if it has been sufficiently aligned in the record. */
5376 || DECL_ALIGN (TREE_OPERAND (gnu_expr, 1))
5377 >= TYPE_ALIGN (TREE_TYPE (gnu_expr)))
5378 && addressable_p (TREE_OPERAND (gnu_expr, 0)));
5380 case ARRAY_REF: case ARRAY_RANGE_REF:
5381 case REALPART_EXPR: case IMAGPART_EXPR:
5383 return addressable_p (TREE_OPERAND (gnu_expr, 0));
5386 return (AGGREGATE_TYPE_P (TREE_TYPE (gnu_expr))
5387 && addressable_p (TREE_OPERAND (gnu_expr, 0)));
5389 case VIEW_CONVERT_EXPR:
5391 /* This is addressable if we can avoid a copy. */
5392 tree type = TREE_TYPE (gnu_expr);
5393 tree inner_type = TREE_TYPE (TREE_OPERAND (gnu_expr, 0));
5395 return (((TYPE_MODE (type) == TYPE_MODE (inner_type)
5396 && (TYPE_ALIGN (type) <= TYPE_ALIGN (inner_type)
5397 || TYPE_ALIGN (inner_type) >= BIGGEST_ALIGNMENT))
5398 || ((TYPE_MODE (type) == BLKmode
5399 || TYPE_MODE (inner_type) == BLKmode)
5400 && (TYPE_ALIGN (type) <= TYPE_ALIGN (inner_type)
5401 || TYPE_ALIGN (inner_type) >= BIGGEST_ALIGNMENT
5402 || TYPE_ALIGN_OK (type)
5403 || TYPE_ALIGN_OK (inner_type))))
5404 && addressable_p (TREE_OPERAND (gnu_expr, 0)));
5412 /* Do the processing for the declaration of a GNAT_ENTITY, a type. If
5413 a separate Freeze node exists, delay the bulk of the processing. Otherwise
5414 make a GCC type for GNAT_ENTITY and set up the correspondence. */
5417 process_type (Entity_Id gnat_entity)
5420 = present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity) : 0;
5423 /* If we are to delay elaboration of this type, just do any
5424 elaborations needed for expressions within the declaration and
5425 make a dummy type entry for this node and its Full_View (if
5426 any) in case something points to it. Don't do this if it
5427 has already been done (the only way that can happen is if
5428 the private completion is also delayed). */
5429 if (Present (Freeze_Node (gnat_entity))
5430 || (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
5431 && Present (Full_View (gnat_entity))
5432 && Freeze_Node (Full_View (gnat_entity))
5433 && !present_gnu_tree (Full_View (gnat_entity))))
5435 elaborate_entity (gnat_entity);
5439 tree gnu_decl = create_type_decl (get_entity_name (gnat_entity),
5440 make_dummy_type (gnat_entity),
5441 NULL, false, false, gnat_entity);
5443 save_gnu_tree (gnat_entity, gnu_decl, false);
5444 if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
5445 && Present (Full_View (gnat_entity)))
5446 save_gnu_tree (Full_View (gnat_entity), gnu_decl, false);
5452 /* If we saved away a dummy type for this node it means that this
5453 made the type that corresponds to the full type of an incomplete
5454 type. Clear that type for now and then update the type in the
5458 if (TREE_CODE (gnu_old) != TYPE_DECL
5459 || !TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old)))
5461 /* If this was a withed access type, this is not an error
5462 and merely indicates we've already elaborated the type
5464 gcc_assert (Is_Type (gnat_entity) && From_With_Type (gnat_entity));
5468 save_gnu_tree (gnat_entity, NULL_TREE, false);
5471 /* Now fully elaborate the type. */
5472 gnu_new = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 1);
5473 gcc_assert (TREE_CODE (gnu_new) == TYPE_DECL);
5475 /* If we have an old type and we've made pointers to this type,
5476 update those pointers. */
5478 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)),
5479 TREE_TYPE (gnu_new));
5481 /* If this is a record type corresponding to a task or protected type
5482 that is a completion of an incomplete type, perform a similar update
5484 /* ??? Including protected types here is a guess. */
5486 if (IN (Ekind (gnat_entity), Record_Kind)
5487 && Is_Concurrent_Record_Type (gnat_entity)
5488 && present_gnu_tree (Corresponding_Concurrent_Type (gnat_entity)))
5491 = get_gnu_tree (Corresponding_Concurrent_Type (gnat_entity));
5493 save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity),
5495 save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity),
5498 update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_task_old)),
5499 TREE_TYPE (gnu_new));
5503 /* GNAT_ASSOC is the front of the Component_Associations of an N_Aggregate.
5504 GNU_TYPE is the GCC type of the corresponding record.
5506 Return a CONSTRUCTOR to build the record. */
5509 assoc_to_constructor (Node_Id gnat_assoc, tree gnu_type)
5511 tree gnu_list, gnu_result;
5513 /* We test for GNU_FIELD being empty in the case where a variant
5514 was the last thing since we don't take things off GNAT_ASSOC in
5515 that case. We check GNAT_ASSOC in case we have a variant, but it
5518 for (gnu_list = NULL_TREE; Present (gnat_assoc);
5519 gnat_assoc = Next (gnat_assoc))
5521 Node_Id gnat_field = First (Choices (gnat_assoc));
5522 tree gnu_field = gnat_to_gnu_field_decl (Entity (gnat_field));
5523 tree gnu_expr = gnat_to_gnu (Expression (gnat_assoc));
5525 /* The expander is supposed to put a single component selector name
5526 in every record component association */
5527 gcc_assert (No (Next (gnat_field)));
5529 /* Ignore fields that have Corresponding_Discriminants since we'll
5530 be setting that field in the parent. */
5531 if (Present (Corresponding_Discriminant (Entity (gnat_field)))
5532 && Is_Tagged_Type (Scope (Entity (gnat_field))))
5535 /* Before assigning a value in an aggregate make sure range checks
5536 are done if required. Then convert to the type of the field. */
5537 if (Do_Range_Check (Expression (gnat_assoc)))
5538 gnu_expr = emit_range_check (gnu_expr, Etype (gnat_field));
5540 gnu_expr = convert (TREE_TYPE (gnu_field), gnu_expr);
5542 /* Add the field and expression to the list. */
5543 gnu_list = tree_cons (gnu_field, gnu_expr, gnu_list);
5546 gnu_result = extract_values (gnu_list, gnu_type);
5548 #ifdef ENABLE_CHECKING
5552 /* Verify every enty in GNU_LIST was used. */
5553 for (gnu_field = gnu_list; gnu_field; gnu_field = TREE_CHAIN (gnu_field))
5554 gcc_assert (TREE_ADDRESSABLE (gnu_field));
5561 /* Builds a possibly nested constructor for array aggregates. GNAT_EXPR
5562 is the first element of an array aggregate. It may itself be an
5563 aggregate (an array or record aggregate). GNU_ARRAY_TYPE is the gnu type
5564 corresponding to the array aggregate. GNAT_COMPONENT_TYPE is the type
5565 of the array component. It is needed for range checking. */
5568 pos_to_constructor (Node_Id gnat_expr, tree gnu_array_type,
5569 Entity_Id gnat_component_type)
5571 tree gnu_expr_list = NULL_TREE;
5572 tree gnu_index = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_array_type));
5575 for ( ; Present (gnat_expr); gnat_expr = Next (gnat_expr))
5577 /* If the expression is itself an array aggregate then first build the
5578 innermost constructor if it is part of our array (multi-dimensional
5581 if (Nkind (gnat_expr) == N_Aggregate
5582 && TREE_CODE (TREE_TYPE (gnu_array_type)) == ARRAY_TYPE
5583 && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_array_type)))
5584 gnu_expr = pos_to_constructor (First (Expressions (gnat_expr)),
5585 TREE_TYPE (gnu_array_type),
5586 gnat_component_type);
5589 gnu_expr = gnat_to_gnu (gnat_expr);
5591 /* before assigning the element to the array make sure it is
5593 if (Do_Range_Check (gnat_expr))
5594 gnu_expr = emit_range_check (gnu_expr, gnat_component_type);
5598 = tree_cons (gnu_index, convert (TREE_TYPE (gnu_array_type), gnu_expr),
5601 gnu_index = int_const_binop (PLUS_EXPR, gnu_index, integer_one_node, 0);
5604 return gnat_build_constructor (gnu_array_type, nreverse (gnu_expr_list));
5607 /* Subroutine of assoc_to_constructor: VALUES is a list of field associations,
5608 some of which are from RECORD_TYPE. Return a CONSTRUCTOR consisting
5609 of the associations that are from RECORD_TYPE. If we see an internal
5610 record, make a recursive call to fill it in as well. */
5613 extract_values (tree values, tree record_type)
5615 tree result = NULL_TREE;
5618 for (field = TYPE_FIELDS (record_type); field; field = TREE_CHAIN (field))
5622 /* _Parent is an internal field, but may have values in the aggregate,
5623 so check for values first. */
5624 if ((tem = purpose_member (field, values)))
5626 value = TREE_VALUE (tem);
5627 TREE_ADDRESSABLE (tem) = 1;
5630 else if (DECL_INTERNAL_P (field))
5632 value = extract_values (values, TREE_TYPE (field));
5633 if (TREE_CODE (value) == CONSTRUCTOR
5634 && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (value)))
5638 /* If we have a record subtype, the names will match, but not the
5639 actual FIELD_DECLs. */
5640 for (tem = values; tem; tem = TREE_CHAIN (tem))
5641 if (DECL_NAME (TREE_PURPOSE (tem)) == DECL_NAME (field))
5643 value = convert (TREE_TYPE (field), TREE_VALUE (tem));
5644 TREE_ADDRESSABLE (tem) = 1;
5650 result = tree_cons (field, value, result);
5653 return gnat_build_constructor (record_type, nreverse (result));
5656 /* EXP is to be treated as an array or record. Handle the cases when it is
5657 an access object and perform the required dereferences. */
5660 maybe_implicit_deref (tree exp)
5662 /* If the type is a pointer, dereference it. */
5664 if (POINTER_TYPE_P (TREE_TYPE (exp)) || TYPE_FAT_POINTER_P (TREE_TYPE (exp)))
5665 exp = build_unary_op (INDIRECT_REF, NULL_TREE, exp);
5667 /* If we got a padded type, remove it too. */
5668 if (TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE
5669 && TYPE_IS_PADDING_P (TREE_TYPE (exp)))
5670 exp = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (exp))), exp);
5675 /* Protect EXP from multiple evaluation. This may make a SAVE_EXPR. */
5678 protect_multiple_eval (tree exp)
5680 tree type = TREE_TYPE (exp);
5682 /* If this has no side effects, we don't need to do anything. */
5683 if (!TREE_SIDE_EFFECTS (exp))
5686 /* If it is a conversion, protect what's inside the conversion.
5687 Similarly, if we're indirectly referencing something, we only
5688 actually need to protect the address since the data itself can't
5689 change in these situations. */
5690 else if (TREE_CODE (exp) == NON_LVALUE_EXPR
5691 || TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
5692 || TREE_CODE (exp) == VIEW_CONVERT_EXPR
5693 || TREE_CODE (exp) == INDIRECT_REF
5694 || TREE_CODE (exp) == UNCONSTRAINED_ARRAY_REF)
5695 return build1 (TREE_CODE (exp), type,
5696 protect_multiple_eval (TREE_OPERAND (exp, 0)));
5698 /* If EXP is a fat pointer or something that can be placed into a register,
5699 just make a SAVE_EXPR. */
5700 if (TYPE_FAT_POINTER_P (type) || TYPE_MODE (type) != BLKmode)
5701 return save_expr (exp);
5703 /* Otherwise, dereference, protect the address, and re-reference. */
5706 build_unary_op (INDIRECT_REF, type,
5707 save_expr (build_unary_op (ADDR_EXPR,
5708 build_reference_type (type),
5712 /* This is equivalent to stabilize_reference in GCC's tree.c, but we know
5713 how to handle our new nodes and we take an extra argument that says
5714 whether to force evaluation of everything. */
5717 gnat_stabilize_reference (tree ref, bool force)
5719 tree type = TREE_TYPE (ref);
5720 enum tree_code code = TREE_CODE (ref);
5728 /* No action is needed in this case. */
5734 case FIX_TRUNC_EXPR:
5735 case FIX_FLOOR_EXPR:
5736 case FIX_ROUND_EXPR:
5738 case VIEW_CONVERT_EXPR:
5741 = build1 (code, type,
5742 gnat_stabilize_reference (TREE_OPERAND (ref, 0), force));
5746 case UNCONSTRAINED_ARRAY_REF:
5747 result = build1 (code, type,
5748 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 0),
5753 result = build3 (COMPONENT_REF, type,
5754 gnat_stabilize_reference (TREE_OPERAND (ref, 0),
5756 TREE_OPERAND (ref, 1), NULL_TREE);
5760 result = build3 (BIT_FIELD_REF, type,
5761 gnat_stabilize_reference (TREE_OPERAND (ref, 0), force),
5762 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
5764 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 2),
5769 case ARRAY_RANGE_REF:
5770 result = build4 (code, type,
5771 gnat_stabilize_reference (TREE_OPERAND (ref, 0), force),
5772 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
5774 NULL_TREE, NULL_TREE);
5778 result = build2 (COMPOUND_EXPR, type,
5779 gnat_stabilize_reference_1 (TREE_OPERAND (ref, 0),
5781 gnat_stabilize_reference (TREE_OPERAND (ref, 1),
5785 /* If arg isn't a kind of lvalue we recognize, make no change.
5786 Caller should recognize the error for an invalid lvalue. */
5791 return error_mark_node;
5794 TREE_READONLY (result) = TREE_READONLY (ref);
5796 /* TREE_THIS_VOLATILE and TREE_SIDE_EFFECTS attached to the initial
5797 expression may not be sustained across some paths, such as the way via
5798 build1 for INDIRECT_REF. We re-populate those flags here for the general
5799 case, which is consistent with the GCC version of this routine.
5801 Special care should be taken regarding TREE_SIDE_EFFECTS, because some
5802 paths introduce side effects where there was none initially (e.g. calls
5803 to save_expr), and we also want to keep track of that. */
5805 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);
5806 TREE_SIDE_EFFECTS (result) |= TREE_SIDE_EFFECTS (ref);
5811 /* Similar to stabilize_reference_1 in tree.c, but supports an extra
5812 arg to force a SAVE_EXPR for everything. */
5815 gnat_stabilize_reference_1 (tree e, bool force)
5817 enum tree_code code = TREE_CODE (e);
5818 tree type = TREE_TYPE (e);
5821 /* We cannot ignore const expressions because it might be a reference
5822 to a const array but whose index contains side-effects. But we can
5823 ignore things that are actual constant or that already have been
5824 handled by this function. */
5826 if (TREE_CONSTANT (e) || code == SAVE_EXPR)
5829 switch (TREE_CODE_CLASS (code))
5831 case tcc_exceptional:
5833 case tcc_declaration:
5834 case tcc_comparison:
5836 case tcc_expression:
5838 /* If this is a COMPONENT_REF of a fat pointer, save the entire
5839 fat pointer. This may be more efficient, but will also allow
5840 us to more easily find the match for the PLACEHOLDER_EXPR. */
5841 if (code == COMPONENT_REF
5842 && TYPE_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (e, 0))))
5843 result = build3 (COMPONENT_REF, type,
5844 gnat_stabilize_reference_1 (TREE_OPERAND (e, 0),
5846 TREE_OPERAND (e, 1), TREE_OPERAND (e, 2));
5847 else if (TREE_SIDE_EFFECTS (e) || force)
5848 return save_expr (e);
5854 /* Constants need no processing. In fact, we should never reach
5859 /* Recursively stabilize each operand. */
5860 result = build2 (code, type,
5861 gnat_stabilize_reference_1 (TREE_OPERAND (e, 0), force),
5862 gnat_stabilize_reference_1 (TREE_OPERAND (e, 1),
5867 /* Recursively stabilize each operand. */
5868 result = build1 (code, type,
5869 gnat_stabilize_reference_1 (TREE_OPERAND (e, 0),
5877 TREE_READONLY (result) = TREE_READONLY (e);
5879 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);
5880 TREE_SIDE_EFFECTS (result) |= TREE_SIDE_EFFECTS (e);
5884 /* Build a global constructor or destructor function. METHOD_TYPE gives
5885 the type of the function and CDTORS points to the list of constructor
5886 or destructor functions to be invoked. FIXME: Migrate into cgraph. */
5889 build_global_cdtor (int method_type, tree *cdtors)
5893 for (; *cdtors; *cdtors = TREE_CHAIN (*cdtors))
5895 tree fn = TREE_VALUE (*cdtors);
5896 tree fntype = TREE_TYPE (fn);
5897 tree fnaddr = build1 (ADDR_EXPR, build_pointer_type (fntype), fn);
5898 tree fncall = build3 (CALL_EXPR, TREE_TYPE (fntype), fnaddr, NULL_TREE,
5900 append_to_statement_list (fncall, &body);
5903 cgraph_build_static_cdtor (method_type, body, DEFAULT_INIT_PRIORITY);
5906 extern char *__gnat_to_canonical_file_spec (char *);
5908 /* Convert Sloc into *LOCUS (a location_t). Return true if this Sloc
5909 corresponds to a source code location and false if it doesn't. In the
5910 latter case, we don't update *LOCUS. We also set the Gigi global variable
5911 REF_FILENAME to the reference file name as given by sinput (i.e no
5915 Sloc_to_locus (Source_Ptr Sloc, location_t *locus)
5917 /* If node not from source code, ignore. */
5921 /* Use the identifier table to make a hashed, permanent copy of the filename,
5922 since the name table gets reallocated after Gigi returns but before all
5923 the debugging information is output. The __gnat_to_canonical_file_spec
5924 call translates filenames from pragmas Source_Reference that contain host
5925 style syntax not understood by gdb. */
5927 = IDENTIFIER_POINTER
5929 (__gnat_to_canonical_file_spec
5930 (Get_Name_String (Full_Debug_Name (Get_Source_File_Index (Sloc))))));
5932 locus->line = Get_Logical_Line_Number (Sloc);
5935 = IDENTIFIER_POINTER
5937 (Get_Name_String (Debug_Source_Name (Get_Source_File_Index (Sloc)))));;
5942 /* Similar to annotate_with_locus, but start with the Sloc of GNAT_NODE and
5943 don't do anything if it doesn't correspond to a source location. */
5946 annotate_with_node (tree node, Node_Id gnat_node)
5950 if (!Sloc_to_locus (Sloc (gnat_node), &locus))
5953 annotate_with_locus (node, locus);
5956 /* Post an error message. MSG is the error message, properly annotated.
5957 NODE is the node at which to post the error and the node to use for the
5958 "&" substitution. */
5961 post_error (const char *msg, Node_Id node)
5963 String_Template temp;
5966 temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
5967 fp.Array = msg, fp.Bounds = &temp;
5969 Error_Msg_N (fp, node);
5972 /* Similar, but NODE is the node at which to post the error and ENT
5973 is the node to use for the "&" substitution. */
5976 post_error_ne (const char *msg, Node_Id node, Entity_Id ent)
5978 String_Template temp;
5981 temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
5982 fp.Array = msg, fp.Bounds = &temp;
5984 Error_Msg_NE (fp, node, ent);
5987 /* Similar, but NODE is the node at which to post the error, ENT is the node
5988 to use for the "&" substitution, and N is the number to use for the ^. */
5991 post_error_ne_num (const char *msg, Node_Id node, Entity_Id ent, int n)
5993 String_Template temp;
5996 temp.Low_Bound = 1, temp.High_Bound = strlen (msg);
5997 fp.Array = msg, fp.Bounds = &temp;
5998 Error_Msg_Uint_1 = UI_From_Int (n);
6001 Error_Msg_NE (fp, node, ent);
6004 /* Similar to post_error_ne_num, but T is a GCC tree representing the
6005 number to write. If the tree represents a constant that fits within
6006 a host integer, the text inside curly brackets in MSG will be output
6007 (presumably including a '^'). Otherwise that text will not be output
6008 and the text inside square brackets will be output instead. */
6011 post_error_ne_tree (const char *msg, Node_Id node, Entity_Id ent, tree t)
6013 char *newmsg = alloca (strlen (msg) + 1);
6014 String_Template temp = {1, 0};
6016 char start_yes, end_yes, start_no, end_no;
6020 fp.Array = newmsg, fp.Bounds = &temp;
6022 if (host_integerp (t, 1)
6023 #if HOST_BITS_PER_WIDE_INT > HOST_BITS_PER_INT
6026 (t, (((unsigned HOST_WIDE_INT) 1 << (HOST_BITS_PER_INT - 1)) - 1)) < 0
6030 Error_Msg_Uint_1 = UI_From_Int (tree_low_cst (t, 1));
6031 start_yes = '{', end_yes = '}', start_no = '[', end_no = ']';
6034 start_yes = '[', end_yes = ']', start_no = '{', end_no = '}';
6036 for (p = msg, q = newmsg; *p; p++)
6038 if (*p == start_yes)
6039 for (p++; *p != end_yes; p++)
6041 else if (*p == start_no)
6042 for (p++; *p != end_no; p++)
6050 temp.High_Bound = strlen (newmsg);
6052 Error_Msg_NE (fp, node, ent);
6055 /* Similar to post_error_ne_tree, except that NUM is a second
6056 integer to write in the message. */
6059 post_error_ne_tree_2 (const char *msg,
6065 Error_Msg_Uint_2 = UI_From_Int (num);
6066 post_error_ne_tree (msg, node, ent, t);
6069 /* Initialize the table that maps GNAT codes to GCC codes for simple
6070 binary and unary operations. */
6073 init_code_table (void)
6075 gnu_codes[N_And_Then] = TRUTH_ANDIF_EXPR;
6076 gnu_codes[N_Or_Else] = TRUTH_ORIF_EXPR;
6078 gnu_codes[N_Op_And] = TRUTH_AND_EXPR;
6079 gnu_codes[N_Op_Or] = TRUTH_OR_EXPR;
6080 gnu_codes[N_Op_Xor] = TRUTH_XOR_EXPR;
6081 gnu_codes[N_Op_Eq] = EQ_EXPR;
6082 gnu_codes[N_Op_Ne] = NE_EXPR;
6083 gnu_codes[N_Op_Lt] = LT_EXPR;
6084 gnu_codes[N_Op_Le] = LE_EXPR;
6085 gnu_codes[N_Op_Gt] = GT_EXPR;
6086 gnu_codes[N_Op_Ge] = GE_EXPR;
6087 gnu_codes[N_Op_Add] = PLUS_EXPR;
6088 gnu_codes[N_Op_Subtract] = MINUS_EXPR;
6089 gnu_codes[N_Op_Multiply] = MULT_EXPR;
6090 gnu_codes[N_Op_Mod] = FLOOR_MOD_EXPR;
6091 gnu_codes[N_Op_Rem] = TRUNC_MOD_EXPR;
6092 gnu_codes[N_Op_Minus] = NEGATE_EXPR;
6093 gnu_codes[N_Op_Abs] = ABS_EXPR;
6094 gnu_codes[N_Op_Not] = TRUTH_NOT_EXPR;
6095 gnu_codes[N_Op_Rotate_Left] = LROTATE_EXPR;
6096 gnu_codes[N_Op_Rotate_Right] = RROTATE_EXPR;
6097 gnu_codes[N_Op_Shift_Left] = LSHIFT_EXPR;
6098 gnu_codes[N_Op_Shift_Right] = RSHIFT_EXPR;
6099 gnu_codes[N_Op_Shift_Right_Arithmetic] = RSHIFT_EXPR;
6102 #include "gt-ada-trans.h"