1 /* Language-independent node constructors for parse phase of GNU compiler.
2 Copyright (C) 1987, 88, 92-96, 1997 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
22 /* This file contains the low level primitives for operating on tree nodes,
23 including allocation, list operations, interning of identifiers,
24 construction of data type nodes and statement nodes,
25 and construction of type conversion nodes. It also contains
26 tables index by tree code that describe how to take apart
29 It is intended to be language-independent, but occasionally
30 calls language-dependent routines defined (for C) in typecheck.c.
32 The low-level allocation routines oballoc and permalloc
33 are used also for allocating many other kinds of objects
34 by all passes of the compiler. */
54 #ifdef NEED_DECLARATION_FREE
55 extern void free PROTO((void *));
58 #define obstack_chunk_alloc xmalloc
59 #define obstack_chunk_free free
61 /* Tree nodes of permanent duration are allocated in this obstack.
62 They are the identifier nodes, and everything outside of
63 the bodies and parameters of function definitions. */
65 struct obstack permanent_obstack;
67 /* The initial RTL, and all ..._TYPE nodes, in a function
68 are allocated in this obstack. Usually they are freed at the
69 end of the function, but if the function is inline they are saved.
70 For top-level functions, this is maybepermanent_obstack.
71 Separate obstacks are made for nested functions. */
73 struct obstack *function_maybepermanent_obstack;
75 /* This is the function_maybepermanent_obstack for top-level functions. */
77 struct obstack maybepermanent_obstack;
79 /* This is a list of function_maybepermanent_obstacks for top-level inline
80 functions that are compiled in the middle of compiling other functions. */
82 struct simple_obstack_stack *toplev_inline_obstacks;
84 /* Former elements of toplev_inline_obstacks that have been recycled. */
86 struct simple_obstack_stack *extra_inline_obstacks;
88 /* This is a list of function_maybepermanent_obstacks for inline functions
89 nested in the current function that were compiled in the middle of
90 compiling other functions. */
92 struct simple_obstack_stack *inline_obstacks;
94 /* The contents of the current function definition are allocated
95 in this obstack, and all are freed at the end of the function.
96 For top-level functions, this is temporary_obstack.
97 Separate obstacks are made for nested functions. */
99 struct obstack *function_obstack;
101 /* This is used for reading initializers of global variables. */
103 struct obstack temporary_obstack;
105 /* The tree nodes of an expression are allocated
106 in this obstack, and all are freed at the end of the expression. */
108 struct obstack momentary_obstack;
110 /* The tree nodes of a declarator are allocated
111 in this obstack, and all are freed when the declarator
114 static struct obstack temp_decl_obstack;
116 /* This points at either permanent_obstack
117 or the current function_maybepermanent_obstack. */
119 struct obstack *saveable_obstack;
121 /* This is same as saveable_obstack during parse and expansion phase;
122 it points to the current function's obstack during optimization.
123 This is the obstack to be used for creating rtl objects. */
125 struct obstack *rtl_obstack;
127 /* This points at either permanent_obstack or the current function_obstack. */
129 struct obstack *current_obstack;
131 /* This points at either permanent_obstack or the current function_obstack
132 or momentary_obstack. */
134 struct obstack *expression_obstack;
136 /* Stack of obstack selections for push_obstacks and pop_obstacks. */
140 struct obstack_stack *next;
141 struct obstack *current;
142 struct obstack *saveable;
143 struct obstack *expression;
147 struct obstack_stack *obstack_stack;
149 /* Obstack for allocating struct obstack_stack entries. */
151 static struct obstack obstack_stack_obstack;
153 /* Addresses of first objects in some obstacks.
154 This is for freeing their entire contents. */
155 char *maybepermanent_firstobj;
156 char *temporary_firstobj;
157 char *momentary_firstobj;
158 char *temp_decl_firstobj;
160 /* This is used to preserve objects (mainly array initializers) that need to
161 live until the end of the current function, but no further. */
162 char *momentary_function_firstobj;
164 /* Nonzero means all ..._TYPE nodes should be allocated permanently. */
166 int all_types_permanent;
168 /* Stack of places to restore the momentary obstack back to. */
170 struct momentary_level
172 /* Pointer back to previous such level. */
173 struct momentary_level *prev;
174 /* First object allocated within this level. */
176 /* Value of expression_obstack saved at entry to this level. */
177 struct obstack *obstack;
180 struct momentary_level *momentary_stack;
182 /* Table indexed by tree code giving a string containing a character
183 classifying the tree code. Possibilities are
184 t, d, s, c, r, <, 1, 2 and e. See tree.def for details. */
186 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
188 char *standard_tree_code_type[] = {
193 /* Table indexed by tree code giving number of expression
194 operands beyond the fixed part of the node structure.
195 Not used for types or decls. */
197 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
199 int standard_tree_code_length[] = {
204 /* Names of tree components.
205 Used for printing out the tree and error messages. */
206 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
208 char *standard_tree_code_name[] = {
213 /* Table indexed by tree code giving a string containing a character
214 classifying the tree code. Possibilities are
215 t, d, s, c, r, e, <, 1 and 2. See tree.def for details. */
217 char **tree_code_type;
219 /* Table indexed by tree code giving number of expression
220 operands beyond the fixed part of the node structure.
221 Not used for types or decls. */
223 int *tree_code_length;
225 /* Table indexed by tree code giving name of tree code, as a string. */
227 char **tree_code_name;
229 /* Statistics-gathering stuff. */
250 int tree_node_counts[(int)all_kinds];
251 int tree_node_sizes[(int)all_kinds];
252 int id_string_size = 0;
254 char *tree_node_kind_names[] = {
272 /* Hash table for uniquizing IDENTIFIER_NODEs by name. */
274 #define MAX_HASH_TABLE 1009
275 static tree hash_table[MAX_HASH_TABLE]; /* id hash buckets */
277 /* 0 while creating built-in identifiers. */
278 static int do_identifier_warnings;
280 /* Unique id for next decl created. */
281 static int next_decl_uid;
282 /* Unique id for next type created. */
283 static int next_type_uid = 1;
285 /* Here is how primitive or already-canonicalized types' hash
287 #define TYPE_HASH(TYPE) ((HOST_WIDE_INT) (TYPE) & 0777777)
289 extern char *mode_name[];
291 void gcc_obstack_init ();
293 /* Init the principal obstacks. */
298 gcc_obstack_init (&obstack_stack_obstack);
299 gcc_obstack_init (&permanent_obstack);
301 gcc_obstack_init (&temporary_obstack);
302 temporary_firstobj = (char *) obstack_alloc (&temporary_obstack, 0);
303 gcc_obstack_init (&momentary_obstack);
304 momentary_firstobj = (char *) obstack_alloc (&momentary_obstack, 0);
305 momentary_function_firstobj = momentary_firstobj;
306 gcc_obstack_init (&maybepermanent_obstack);
307 maybepermanent_firstobj
308 = (char *) obstack_alloc (&maybepermanent_obstack, 0);
309 gcc_obstack_init (&temp_decl_obstack);
310 temp_decl_firstobj = (char *) obstack_alloc (&temp_decl_obstack, 0);
312 function_obstack = &temporary_obstack;
313 function_maybepermanent_obstack = &maybepermanent_obstack;
314 current_obstack = &permanent_obstack;
315 expression_obstack = &permanent_obstack;
316 rtl_obstack = saveable_obstack = &permanent_obstack;
318 /* Init the hash table of identifiers. */
319 bzero ((char *) hash_table, sizeof hash_table);
323 gcc_obstack_init (obstack)
324 struct obstack *obstack;
326 /* Let particular systems override the size of a chunk. */
327 #ifndef OBSTACK_CHUNK_SIZE
328 #define OBSTACK_CHUNK_SIZE 0
330 /* Let them override the alloc and free routines too. */
331 #ifndef OBSTACK_CHUNK_ALLOC
332 #define OBSTACK_CHUNK_ALLOC xmalloc
334 #ifndef OBSTACK_CHUNK_FREE
335 #define OBSTACK_CHUNK_FREE free
337 _obstack_begin (obstack, OBSTACK_CHUNK_SIZE, 0,
338 (void *(*) ()) OBSTACK_CHUNK_ALLOC,
339 (void (*) ()) OBSTACK_CHUNK_FREE);
342 /* Save all variables describing the current status into the structure *P.
343 This is used before starting a nested function.
345 CONTEXT is the decl_function_context for the function we're about to
346 compile; if it isn't current_function_decl, we have to play some games. */
349 save_tree_status (p, context)
353 p->all_types_permanent = all_types_permanent;
354 p->momentary_stack = momentary_stack;
355 p->maybepermanent_firstobj = maybepermanent_firstobj;
356 p->temporary_firstobj = temporary_firstobj;
357 p->momentary_firstobj = momentary_firstobj;
358 p->momentary_function_firstobj = momentary_function_firstobj;
359 p->function_obstack = function_obstack;
360 p->function_maybepermanent_obstack = function_maybepermanent_obstack;
361 p->current_obstack = current_obstack;
362 p->expression_obstack = expression_obstack;
363 p->saveable_obstack = saveable_obstack;
364 p->rtl_obstack = rtl_obstack;
365 p->inline_obstacks = inline_obstacks;
367 if (context == current_function_decl)
368 /* Objects that need to be saved in this function can be in the nonsaved
369 obstack of the enclosing function since they can't possibly be needed
370 once it has returned. */
371 function_maybepermanent_obstack = function_obstack;
374 /* We're compiling a function which isn't nested in the current
375 function. We need to create a new maybepermanent_obstack for this
376 function, since it can't go onto any of the existing obstacks. */
377 struct simple_obstack_stack **head;
378 struct simple_obstack_stack *current;
380 if (context == NULL_TREE)
381 head = &toplev_inline_obstacks;
384 struct function *f = find_function_data (context);
385 head = &f->inline_obstacks;
388 if (context == NULL_TREE && extra_inline_obstacks)
390 current = extra_inline_obstacks;
391 extra_inline_obstacks = current->next;
395 current = ((struct simple_obstack_stack *)
396 xmalloc (sizeof (struct simple_obstack_stack)));
399 = (struct obstack *) xmalloc (sizeof (struct obstack));
400 gcc_obstack_init (current->obstack);
403 function_maybepermanent_obstack = current->obstack;
405 current->next = *head;
409 maybepermanent_firstobj
410 = (char *) obstack_finish (function_maybepermanent_obstack);
412 function_obstack = (struct obstack *) xmalloc (sizeof (struct obstack));
413 gcc_obstack_init (function_obstack);
415 current_obstack = &permanent_obstack;
416 expression_obstack = &permanent_obstack;
417 rtl_obstack = saveable_obstack = &permanent_obstack;
419 temporary_firstobj = (char *) obstack_alloc (&temporary_obstack, 0);
420 momentary_firstobj = (char *) obstack_finish (&momentary_obstack);
421 momentary_function_firstobj = momentary_firstobj;
424 /* Restore all variables describing the current status from the structure *P.
425 This is used after a nested function. */
428 restore_tree_status (p, context)
432 all_types_permanent = p->all_types_permanent;
433 momentary_stack = p->momentary_stack;
435 obstack_free (&momentary_obstack, momentary_function_firstobj);
437 /* Free saveable storage used by the function just compiled and not
440 CAUTION: This is in function_obstack of the containing function.
441 So we must be sure that we never allocate from that obstack during
442 the compilation of a nested function if we expect it to survive
443 past the nested function's end. */
444 obstack_free (function_maybepermanent_obstack, maybepermanent_firstobj);
446 /* If we were compiling a toplevel function, we can free this space now. */
447 if (context == NULL_TREE)
449 obstack_free (&temporary_obstack, temporary_firstobj);
450 obstack_free (&momentary_obstack, momentary_function_firstobj);
453 /* If we were compiling a toplevel function that we don't actually want
454 to save anything from, return the obstack to the pool. */
455 if (context == NULL_TREE
456 && obstack_empty_p (function_maybepermanent_obstack))
458 struct simple_obstack_stack *current, **p = &toplev_inline_obstacks;
460 while ((*p)->obstack != function_maybepermanent_obstack)
465 current->next = extra_inline_obstacks;
466 extra_inline_obstacks = current;
469 obstack_free (function_obstack, 0);
470 free (function_obstack);
472 temporary_firstobj = p->temporary_firstobj;
473 momentary_firstobj = p->momentary_firstobj;
474 momentary_function_firstobj = p->momentary_function_firstobj;
475 maybepermanent_firstobj = p->maybepermanent_firstobj;
476 function_obstack = p->function_obstack;
477 function_maybepermanent_obstack = p->function_maybepermanent_obstack;
478 current_obstack = p->current_obstack;
479 expression_obstack = p->expression_obstack;
480 saveable_obstack = p->saveable_obstack;
481 rtl_obstack = p->rtl_obstack;
482 inline_obstacks = p->inline_obstacks;
485 /* Start allocating on the temporary (per function) obstack.
486 This is done in start_function before parsing the function body,
487 and before each initialization at top level, and to go back
488 to temporary allocation after doing permanent_allocation. */
491 temporary_allocation ()
493 /* Note that function_obstack at top level points to temporary_obstack.
494 But within a nested function context, it is a separate obstack. */
495 current_obstack = function_obstack;
496 expression_obstack = function_obstack;
497 rtl_obstack = saveable_obstack = function_maybepermanent_obstack;
502 /* Start allocating on the permanent obstack but don't
503 free the temporary data. After calling this, call
504 `permanent_allocation' to fully resume permanent allocation status. */
507 end_temporary_allocation ()
509 current_obstack = &permanent_obstack;
510 expression_obstack = &permanent_obstack;
511 rtl_obstack = saveable_obstack = &permanent_obstack;
514 /* Resume allocating on the temporary obstack, undoing
515 effects of `end_temporary_allocation'. */
518 resume_temporary_allocation ()
520 current_obstack = function_obstack;
521 expression_obstack = function_obstack;
522 rtl_obstack = saveable_obstack = function_maybepermanent_obstack;
525 /* While doing temporary allocation, switch to allocating in such a
526 way as to save all nodes if the function is inlined. Call
527 resume_temporary_allocation to go back to ordinary temporary
531 saveable_allocation ()
533 /* Note that function_obstack at top level points to temporary_obstack.
534 But within a nested function context, it is a separate obstack. */
535 expression_obstack = current_obstack = saveable_obstack;
538 /* Switch to current obstack CURRENT and maybepermanent obstack SAVEABLE,
539 recording the previously current obstacks on a stack.
540 This does not free any storage in any obstack. */
543 push_obstacks (current, saveable)
544 struct obstack *current, *saveable;
546 struct obstack_stack *p
547 = (struct obstack_stack *) obstack_alloc (&obstack_stack_obstack,
548 (sizeof (struct obstack_stack)));
550 p->current = current_obstack;
551 p->saveable = saveable_obstack;
552 p->expression = expression_obstack;
553 p->rtl = rtl_obstack;
554 p->next = obstack_stack;
557 current_obstack = current;
558 expression_obstack = current;
559 rtl_obstack = saveable_obstack = saveable;
562 /* Save the current set of obstacks, but don't change them. */
565 push_obstacks_nochange ()
567 struct obstack_stack *p
568 = (struct obstack_stack *) obstack_alloc (&obstack_stack_obstack,
569 (sizeof (struct obstack_stack)));
571 p->current = current_obstack;
572 p->saveable = saveable_obstack;
573 p->expression = expression_obstack;
574 p->rtl = rtl_obstack;
575 p->next = obstack_stack;
579 /* Pop the obstack selection stack. */
584 struct obstack_stack *p = obstack_stack;
585 obstack_stack = p->next;
587 current_obstack = p->current;
588 saveable_obstack = p->saveable;
589 expression_obstack = p->expression;
590 rtl_obstack = p->rtl;
592 obstack_free (&obstack_stack_obstack, p);
595 /* Nonzero if temporary allocation is currently in effect.
596 Zero if currently doing permanent allocation. */
599 allocation_temporary_p ()
601 return current_obstack != &permanent_obstack;
604 /* Go back to allocating on the permanent obstack
605 and free everything in the temporary obstack.
607 FUNCTION_END is true only if we have just finished compiling a function.
608 In that case, we also free preserved initial values on the momentary
612 permanent_allocation (function_end)
615 /* Free up previous temporary obstack data */
616 obstack_free (&temporary_obstack, temporary_firstobj);
619 obstack_free (&momentary_obstack, momentary_function_firstobj);
620 momentary_firstobj = momentary_function_firstobj;
623 obstack_free (&momentary_obstack, momentary_firstobj);
624 obstack_free (function_maybepermanent_obstack, maybepermanent_firstobj);
625 obstack_free (&temp_decl_obstack, temp_decl_firstobj);
627 /* Free up the maybepermanent_obstacks for any of our nested functions
628 which were compiled at a lower level. */
629 while (inline_obstacks)
631 struct simple_obstack_stack *current = inline_obstacks;
632 inline_obstacks = current->next;
633 obstack_free (current->obstack, 0);
634 free (current->obstack);
638 current_obstack = &permanent_obstack;
639 expression_obstack = &permanent_obstack;
640 rtl_obstack = saveable_obstack = &permanent_obstack;
643 /* Save permanently everything on the maybepermanent_obstack. */
648 maybepermanent_firstobj
649 = (char *) obstack_alloc (function_maybepermanent_obstack, 0);
653 preserve_initializer ()
655 struct momentary_level *tem;
659 = (char *) obstack_alloc (&temporary_obstack, 0);
660 maybepermanent_firstobj
661 = (char *) obstack_alloc (function_maybepermanent_obstack, 0);
663 old_momentary = momentary_firstobj;
665 = (char *) obstack_alloc (&momentary_obstack, 0);
666 if (momentary_firstobj != old_momentary)
667 for (tem = momentary_stack; tem; tem = tem->prev)
668 tem->base = momentary_firstobj;
671 /* Start allocating new rtl in current_obstack.
672 Use resume_temporary_allocation
673 to go back to allocating rtl in saveable_obstack. */
676 rtl_in_current_obstack ()
678 rtl_obstack = current_obstack;
681 /* Start allocating rtl from saveable_obstack. Intended to be used after
682 a call to push_obstacks_nochange. */
685 rtl_in_saveable_obstack ()
687 rtl_obstack = saveable_obstack;
690 /* Allocate SIZE bytes in the current obstack
691 and return a pointer to them.
692 In practice the current obstack is always the temporary one. */
698 return (char *) obstack_alloc (current_obstack, size);
701 /* Free the object PTR in the current obstack
702 as well as everything allocated since PTR.
703 In practice the current obstack is always the temporary one. */
709 obstack_free (current_obstack, ptr);
712 /* Allocate SIZE bytes in the permanent obstack
713 and return a pointer to them. */
719 return (char *) obstack_alloc (&permanent_obstack, size);
722 /* Allocate NELEM items of SIZE bytes in the permanent obstack
723 and return a pointer to them. The storage is cleared before
724 returning the value. */
727 perm_calloc (nelem, size)
731 char *rval = (char *) obstack_alloc (&permanent_obstack, nelem * size);
732 bzero (rval, nelem * size);
736 /* Allocate SIZE bytes in the saveable obstack
737 and return a pointer to them. */
743 return (char *) obstack_alloc (saveable_obstack, size);
746 /* Allocate SIZE bytes in the expression obstack
747 and return a pointer to them. */
753 return (char *) obstack_alloc (expression_obstack, size);
756 /* Print out which obstack an object is in. */
759 print_obstack_name (object, file, prefix)
764 struct obstack *obstack = NULL;
765 char *obstack_name = NULL;
768 for (p = outer_function_chain; p; p = p->next)
770 if (_obstack_allocated_p (p->function_obstack, object))
772 obstack = p->function_obstack;
773 obstack_name = "containing function obstack";
775 if (_obstack_allocated_p (p->function_maybepermanent_obstack, object))
777 obstack = p->function_maybepermanent_obstack;
778 obstack_name = "containing function maybepermanent obstack";
782 if (_obstack_allocated_p (&obstack_stack_obstack, object))
784 obstack = &obstack_stack_obstack;
785 obstack_name = "obstack_stack_obstack";
787 else if (_obstack_allocated_p (function_obstack, object))
789 obstack = function_obstack;
790 obstack_name = "function obstack";
792 else if (_obstack_allocated_p (&permanent_obstack, object))
794 obstack = &permanent_obstack;
795 obstack_name = "permanent_obstack";
797 else if (_obstack_allocated_p (&momentary_obstack, object))
799 obstack = &momentary_obstack;
800 obstack_name = "momentary_obstack";
802 else if (_obstack_allocated_p (function_maybepermanent_obstack, object))
804 obstack = function_maybepermanent_obstack;
805 obstack_name = "function maybepermanent obstack";
807 else if (_obstack_allocated_p (&temp_decl_obstack, object))
809 obstack = &temp_decl_obstack;
810 obstack_name = "temp_decl_obstack";
813 /* Check to see if the object is in the free area of the obstack. */
816 if (object >= obstack->next_free
817 && object < obstack->chunk_limit)
818 fprintf (file, "%s in free portion of obstack %s",
819 prefix, obstack_name);
821 fprintf (file, "%s allocated from %s", prefix, obstack_name);
824 fprintf (file, "%s not allocated from any obstack", prefix);
828 debug_obstack (object)
831 print_obstack_name (object, stderr, "object");
832 fprintf (stderr, ".\n");
835 /* Return 1 if OBJ is in the permanent obstack.
836 This is slow, and should be used only for debugging.
837 Use TREE_PERMANENT for other purposes. */
840 object_permanent_p (obj)
843 return _obstack_allocated_p (&permanent_obstack, obj);
846 /* Start a level of momentary allocation.
847 In C, each compound statement has its own level
848 and that level is freed at the end of each statement.
849 All expression nodes are allocated in the momentary allocation level. */
854 struct momentary_level *tem
855 = (struct momentary_level *) obstack_alloc (&momentary_obstack,
856 sizeof (struct momentary_level));
857 tem->prev = momentary_stack;
858 tem->base = (char *) obstack_base (&momentary_obstack);
859 tem->obstack = expression_obstack;
860 momentary_stack = tem;
861 expression_obstack = &momentary_obstack;
864 /* Set things up so the next clear_momentary will only clear memory
865 past our present position in momentary_obstack. */
868 preserve_momentary ()
870 momentary_stack->base = (char *) obstack_base (&momentary_obstack);
873 /* Free all the storage in the current momentary-allocation level.
874 In C, this happens at the end of each statement. */
879 obstack_free (&momentary_obstack, momentary_stack->base);
882 /* Discard a level of momentary allocation.
883 In C, this happens at the end of each compound statement.
884 Restore the status of expression node allocation
885 that was in effect before this level was created. */
890 struct momentary_level *tem = momentary_stack;
891 momentary_stack = tem->prev;
892 expression_obstack = tem->obstack;
893 /* We can't free TEM from the momentary_obstack, because there might
894 be objects above it which have been saved. We can free back to the
895 stack of the level we are popping off though. */
896 obstack_free (&momentary_obstack, tem->base);
899 /* Pop back to the previous level of momentary allocation,
900 but don't free any momentary data just yet. */
903 pop_momentary_nofree ()
905 struct momentary_level *tem = momentary_stack;
906 momentary_stack = tem->prev;
907 expression_obstack = tem->obstack;
910 /* Call when starting to parse a declaration:
911 make expressions in the declaration last the length of the function.
912 Returns an argument that should be passed to resume_momentary later. */
917 register int tem = expression_obstack == &momentary_obstack;
918 expression_obstack = saveable_obstack;
922 /* Call when finished parsing a declaration:
923 restore the treatment of node-allocation that was
924 in effect before the suspension.
925 YES should be the value previously returned by suspend_momentary. */
928 resume_momentary (yes)
932 expression_obstack = &momentary_obstack;
935 /* Init the tables indexed by tree code.
936 Note that languages can add to these tables to define their own codes. */
941 tree_code_type = (char **) xmalloc (sizeof (standard_tree_code_type));
942 tree_code_length = (int *) xmalloc (sizeof (standard_tree_code_length));
943 tree_code_name = (char **) xmalloc (sizeof (standard_tree_code_name));
944 bcopy ((char *) standard_tree_code_type, (char *) tree_code_type,
945 sizeof (standard_tree_code_type));
946 bcopy ((char *) standard_tree_code_length, (char *) tree_code_length,
947 sizeof (standard_tree_code_length));
948 bcopy ((char *) standard_tree_code_name, (char *) tree_code_name,
949 sizeof (standard_tree_code_name));
952 /* Return a newly allocated node of code CODE.
953 Initialize the node's unique id and its TREE_PERMANENT flag.
954 For decl and type nodes, some other fields are initialized.
955 The rest of the node is initialized to zero.
957 Achoo! I got a code in the node. */
964 register int type = TREE_CODE_CLASS (code);
966 register struct obstack *obstack = current_obstack;
968 register tree_node_kind kind;
972 case 'd': /* A decl node */
973 #ifdef GATHER_STATISTICS
976 length = sizeof (struct tree_decl);
977 /* All decls in an inline function need to be saved. */
978 if (obstack != &permanent_obstack)
979 obstack = saveable_obstack;
981 /* PARM_DECLs go on the context of the parent. If this is a nested
982 function, then we must allocate the PARM_DECL on the parent's
983 obstack, so that they will live to the end of the parent's
984 closing brace. This is necessary in case we try to inline the
985 function into its parent.
987 PARM_DECLs of top-level functions do not have this problem. However,
988 we allocate them where we put the FUNCTION_DECL for languages such as
989 Ada that need to consult some flags in the PARM_DECLs of the function
992 See comment in restore_tree_status for why we can't put this
993 in function_obstack. */
994 if (code == PARM_DECL && obstack != &permanent_obstack)
997 if (current_function_decl)
998 context = decl_function_context (current_function_decl);
1002 = find_function_data (context)->function_maybepermanent_obstack;
1006 case 't': /* a type node */
1007 #ifdef GATHER_STATISTICS
1010 length = sizeof (struct tree_type);
1011 /* All data types are put where we can preserve them if nec. */
1012 if (obstack != &permanent_obstack)
1013 obstack = all_types_permanent ? &permanent_obstack : saveable_obstack;
1016 case 'b': /* a lexical block */
1017 #ifdef GATHER_STATISTICS
1020 length = sizeof (struct tree_block);
1021 /* All BLOCK nodes are put where we can preserve them if nec. */
1022 if (obstack != &permanent_obstack)
1023 obstack = saveable_obstack;
1026 case 's': /* an expression with side effects */
1027 #ifdef GATHER_STATISTICS
1031 case 'r': /* a reference */
1032 #ifdef GATHER_STATISTICS
1036 case 'e': /* an expression */
1037 case '<': /* a comparison expression */
1038 case '1': /* a unary arithmetic expression */
1039 case '2': /* a binary arithmetic expression */
1040 #ifdef GATHER_STATISTICS
1044 obstack = expression_obstack;
1045 /* All BIND_EXPR nodes are put where we can preserve them if nec. */
1046 if (code == BIND_EXPR && obstack != &permanent_obstack)
1047 obstack = saveable_obstack;
1048 length = sizeof (struct tree_exp)
1049 + (tree_code_length[(int) code] - 1) * sizeof (char *);
1052 case 'c': /* a constant */
1053 #ifdef GATHER_STATISTICS
1056 obstack = expression_obstack;
1058 /* We can't use tree_code_length for INTEGER_CST, since the number of
1059 words is machine-dependent due to varying length of HOST_WIDE_INT,
1060 which might be wider than a pointer (e.g., long long). Similarly
1061 for REAL_CST, since the number of words is machine-dependent due
1062 to varying size and alignment of `double'. */
1064 if (code == INTEGER_CST)
1065 length = sizeof (struct tree_int_cst);
1066 else if (code == REAL_CST)
1067 length = sizeof (struct tree_real_cst);
1069 length = sizeof (struct tree_common)
1070 + tree_code_length[(int) code] * sizeof (char *);
1073 case 'x': /* something random, like an identifier. */
1074 #ifdef GATHER_STATISTICS
1075 if (code == IDENTIFIER_NODE)
1077 else if (code == OP_IDENTIFIER)
1079 else if (code == TREE_VEC)
1084 length = sizeof (struct tree_common)
1085 + tree_code_length[(int) code] * sizeof (char *);
1086 /* Identifier nodes are always permanent since they are
1087 unique in a compiler run. */
1088 if (code == IDENTIFIER_NODE) obstack = &permanent_obstack;
1095 t = (tree) obstack_alloc (obstack, length);
1097 #ifdef GATHER_STATISTICS
1098 tree_node_counts[(int)kind]++;
1099 tree_node_sizes[(int)kind] += length;
1102 /* Clear a word at a time. */
1103 for (i = (length / sizeof (int)) - 1; i >= 0; i--)
1105 /* Clear any extra bytes. */
1106 for (i = length / sizeof (int) * sizeof (int); i < length; i++)
1107 ((char *) t)[i] = 0;
1109 TREE_SET_CODE (t, code);
1110 if (obstack == &permanent_obstack)
1111 TREE_PERMANENT (t) = 1;
1116 TREE_SIDE_EFFECTS (t) = 1;
1117 TREE_TYPE (t) = void_type_node;
1121 if (code != FUNCTION_DECL)
1123 DECL_IN_SYSTEM_HEADER (t)
1124 = in_system_header && (obstack == &permanent_obstack);
1125 DECL_SOURCE_LINE (t) = lineno;
1126 DECL_SOURCE_FILE (t) = (input_filename) ? input_filename : "<built-in>";
1127 DECL_UID (t) = next_decl_uid++;
1131 TYPE_UID (t) = next_type_uid++;
1133 TYPE_MAIN_VARIANT (t) = t;
1134 TYPE_OBSTACK (t) = obstack;
1135 TYPE_ATTRIBUTES (t) = NULL_TREE;
1136 #ifdef SET_DEFAULT_TYPE_ATTRIBUTES
1137 SET_DEFAULT_TYPE_ATTRIBUTES (t);
1142 TREE_CONSTANT (t) = 1;
1149 /* Return a new node with the same contents as NODE
1150 except that its TREE_CHAIN is zero and it has a fresh uid. */
1157 register enum tree_code code = TREE_CODE (node);
1158 register int length;
1161 switch (TREE_CODE_CLASS (code))
1163 case 'd': /* A decl node */
1164 length = sizeof (struct tree_decl);
1167 case 't': /* a type node */
1168 length = sizeof (struct tree_type);
1171 case 'b': /* a lexical block node */
1172 length = sizeof (struct tree_block);
1175 case 'r': /* a reference */
1176 case 'e': /* an expression */
1177 case 's': /* an expression with side effects */
1178 case '<': /* a comparison expression */
1179 case '1': /* a unary arithmetic expression */
1180 case '2': /* a binary arithmetic expression */
1181 length = sizeof (struct tree_exp)
1182 + (tree_code_length[(int) code] - 1) * sizeof (char *);
1185 case 'c': /* a constant */
1186 /* We can't use tree_code_length for INTEGER_CST, since the number of
1187 words is machine-dependent due to varying length of HOST_WIDE_INT,
1188 which might be wider than a pointer (e.g., long long). Similarly
1189 for REAL_CST, since the number of words is machine-dependent due
1190 to varying size and alignment of `double'. */
1191 if (code == INTEGER_CST)
1192 length = sizeof (struct tree_int_cst);
1193 else if (code == REAL_CST)
1194 length = sizeof (struct tree_real_cst);
1196 length = (sizeof (struct tree_common)
1197 + tree_code_length[(int) code] * sizeof (char *));
1200 case 'x': /* something random, like an identifier. */
1201 length = sizeof (struct tree_common)
1202 + tree_code_length[(int) code] * sizeof (char *);
1203 if (code == TREE_VEC)
1204 length += (TREE_VEC_LENGTH (node) - 1) * sizeof (char *);
1207 t = (tree) obstack_alloc (current_obstack, length);
1209 for (i = (length / sizeof (int)) - 1; i >= 0; i--)
1210 ((int *) t)[i] = ((int *) node)[i];
1211 /* Clear any extra bytes. */
1212 for (i = length / sizeof (int) * sizeof (int); i < length; i++)
1213 ((char *) t)[i] = ((char *) node)[i];
1216 TREE_ASM_WRITTEN (t) = 0;
1218 if (TREE_CODE_CLASS (code) == 'd')
1219 DECL_UID (t) = next_decl_uid++;
1220 else if (TREE_CODE_CLASS (code) == 't')
1222 TYPE_UID (t) = next_type_uid++;
1223 TYPE_OBSTACK (t) = current_obstack;
1225 /* The following is so that the debug code for
1226 the copy is different from the original type.
1227 The two statements usually duplicate each other
1228 (because they clear fields of the same union),
1229 but the optimizer should catch that. */
1230 TYPE_SYMTAB_POINTER (t) = 0;
1231 TYPE_SYMTAB_ADDRESS (t) = 0;
1234 TREE_PERMANENT (t) = (current_obstack == &permanent_obstack);
1239 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
1240 For example, this can copy a list made of TREE_LIST nodes. */
1247 register tree prev, next;
1252 head = prev = copy_node (list);
1253 next = TREE_CHAIN (list);
1256 TREE_CHAIN (prev) = copy_node (next);
1257 prev = TREE_CHAIN (prev);
1258 next = TREE_CHAIN (next);
1265 /* Return an IDENTIFIER_NODE whose name is TEXT (a null-terminated string).
1266 If an identifier with that name has previously been referred to,
1267 the same node is returned this time. */
1270 get_identifier (text)
1271 register char *text;
1276 register int len, hash_len;
1278 /* Compute length of text in len. */
1279 for (len = 0; text[len]; len++);
1281 /* Decide how much of that length to hash on */
1283 if (warn_id_clash && len > id_clash_len)
1284 hash_len = id_clash_len;
1286 /* Compute hash code */
1287 hi = hash_len * 613 + (unsigned) text[0];
1288 for (i = 1; i < hash_len; i += 2)
1289 hi = ((hi * 613) + (unsigned) (text[i]));
1291 hi &= (1 << HASHBITS) - 1;
1292 hi %= MAX_HASH_TABLE;
1294 /* Search table for identifier */
1295 for (idp = hash_table[hi]; idp; idp = TREE_CHAIN (idp))
1296 if (IDENTIFIER_LENGTH (idp) == len
1297 && IDENTIFIER_POINTER (idp)[0] == text[0]
1298 && !bcmp (IDENTIFIER_POINTER (idp), text, len))
1299 return idp; /* <-- return if found */
1301 /* Not found; optionally warn about a similar identifier */
1302 if (warn_id_clash && do_identifier_warnings && len >= id_clash_len)
1303 for (idp = hash_table[hi]; idp; idp = TREE_CHAIN (idp))
1304 if (!strncmp (IDENTIFIER_POINTER (idp), text, id_clash_len))
1306 warning ("`%s' and `%s' identical in first %d characters",
1307 IDENTIFIER_POINTER (idp), text, id_clash_len);
1311 if (tree_code_length[(int) IDENTIFIER_NODE] < 0)
1312 abort (); /* set_identifier_size hasn't been called. */
1314 /* Not found, create one, add to chain */
1315 idp = make_node (IDENTIFIER_NODE);
1316 IDENTIFIER_LENGTH (idp) = len;
1317 #ifdef GATHER_STATISTICS
1318 id_string_size += len;
1321 IDENTIFIER_POINTER (idp) = obstack_copy0 (&permanent_obstack, text, len);
1323 TREE_CHAIN (idp) = hash_table[hi];
1324 hash_table[hi] = idp;
1325 return idp; /* <-- return if created */
1328 /* If an identifier with the name TEXT (a null-terminated string) has
1329 previously been referred to, return that node; otherwise return
1333 maybe_get_identifier (text)
1334 register char *text;
1339 register int len, hash_len;
1341 /* Compute length of text in len. */
1342 for (len = 0; text[len]; len++);
1344 /* Decide how much of that length to hash on */
1346 if (warn_id_clash && len > id_clash_len)
1347 hash_len = id_clash_len;
1349 /* Compute hash code */
1350 hi = hash_len * 613 + (unsigned) text[0];
1351 for (i = 1; i < hash_len; i += 2)
1352 hi = ((hi * 613) + (unsigned) (text[i]));
1354 hi &= (1 << HASHBITS) - 1;
1355 hi %= MAX_HASH_TABLE;
1357 /* Search table for identifier */
1358 for (idp = hash_table[hi]; idp; idp = TREE_CHAIN (idp))
1359 if (IDENTIFIER_LENGTH (idp) == len
1360 && IDENTIFIER_POINTER (idp)[0] == text[0]
1361 && !bcmp (IDENTIFIER_POINTER (idp), text, len))
1362 return idp; /* <-- return if found */
1367 /* Enable warnings on similar identifiers (if requested).
1368 Done after the built-in identifiers are created. */
1371 start_identifier_warnings ()
1373 do_identifier_warnings = 1;
1376 /* Record the size of an identifier node for the language in use.
1377 SIZE is the total size in bytes.
1378 This is called by the language-specific files. This must be
1379 called before allocating any identifiers. */
1382 set_identifier_size (size)
1385 tree_code_length[(int) IDENTIFIER_NODE]
1386 = (size - sizeof (struct tree_common)) / sizeof (tree);
1389 /* Return a newly constructed INTEGER_CST node whose constant value
1390 is specified by the two ints LOW and HI.
1391 The TREE_TYPE is set to `int'.
1393 This function should be used via the `build_int_2' macro. */
1396 build_int_2_wide (low, hi)
1397 HOST_WIDE_INT low, hi;
1399 register tree t = make_node (INTEGER_CST);
1400 TREE_INT_CST_LOW (t) = low;
1401 TREE_INT_CST_HIGH (t) = hi;
1402 TREE_TYPE (t) = integer_type_node;
1406 /* Return a new REAL_CST node whose type is TYPE and value is D. */
1409 build_real (type, d)
1416 /* Check for valid float value for this type on this target machine;
1417 if not, can print error message and store a valid value in D. */
1418 #ifdef CHECK_FLOAT_VALUE
1419 CHECK_FLOAT_VALUE (TYPE_MODE (type), d, overflow);
1422 v = make_node (REAL_CST);
1423 TREE_TYPE (v) = type;
1424 TREE_REAL_CST (v) = d;
1425 TREE_OVERFLOW (v) = TREE_CONSTANT_OVERFLOW (v) = overflow;
1429 /* Return a new REAL_CST node whose type is TYPE
1430 and whose value is the integer value of the INTEGER_CST node I. */
1432 #if !defined (REAL_IS_NOT_DOUBLE) || defined (REAL_ARITHMETIC)
1435 real_value_from_int_cst (type, i)
1440 /* Some 386 compilers mishandle unsigned int to float conversions,
1441 so introduce a temporary variable E to avoid those bugs. */
1443 #ifdef REAL_ARITHMETIC
1444 if (! TREE_UNSIGNED (TREE_TYPE (i)))
1445 REAL_VALUE_FROM_INT (d, TREE_INT_CST_LOW (i), TREE_INT_CST_HIGH (i),
1448 REAL_VALUE_FROM_UNSIGNED_INT (d, TREE_INT_CST_LOW (i),
1449 TREE_INT_CST_HIGH (i), TYPE_MODE (type));
1450 #else /* not REAL_ARITHMETIC */
1451 if (TREE_INT_CST_HIGH (i) < 0 && ! TREE_UNSIGNED (TREE_TYPE (i)))
1453 d = (double) (~ TREE_INT_CST_HIGH (i));
1454 e = ((double) ((HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT / 2))
1455 * (double) ((HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT / 2)));
1457 e = (double) (unsigned HOST_WIDE_INT) (~ TREE_INT_CST_LOW (i));
1463 d = (double) (unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (i);
1464 e = ((double) ((HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT / 2))
1465 * (double) ((HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT / 2)));
1467 e = (double) (unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (i);
1470 #endif /* not REAL_ARITHMETIC */
1474 /* This function can't be implemented if we can't do arithmetic
1475 on the float representation. */
1478 build_real_from_int_cst (type, i)
1483 int overflow = TREE_OVERFLOW (i);
1485 jmp_buf float_error;
1487 v = make_node (REAL_CST);
1488 TREE_TYPE (v) = type;
1490 if (setjmp (float_error))
1497 set_float_handler (float_error);
1499 #ifdef REAL_ARITHMETIC
1500 d = real_value_from_int_cst (type, i);
1502 d = REAL_VALUE_TRUNCATE (TYPE_MODE (type),
1503 real_value_from_int_cst (type, i));
1506 /* Check for valid float value for this type on this target machine. */
1509 set_float_handler (NULL_PTR);
1511 #ifdef CHECK_FLOAT_VALUE
1512 CHECK_FLOAT_VALUE (TYPE_MODE (type), d, overflow);
1515 TREE_REAL_CST (v) = d;
1516 TREE_OVERFLOW (v) = TREE_CONSTANT_OVERFLOW (v) = overflow;
1520 #endif /* not REAL_IS_NOT_DOUBLE, or REAL_ARITHMETIC */
1522 /* Return a newly constructed STRING_CST node whose value is
1523 the LEN characters at STR.
1524 The TREE_TYPE is not initialized. */
1527 build_string (len, str)
1531 /* Put the string in saveable_obstack since it will be placed in the RTL
1532 for an "asm" statement and will also be kept around a while if
1533 deferring constant output in varasm.c. */
1535 register tree s = make_node (STRING_CST);
1536 TREE_STRING_LENGTH (s) = len;
1537 TREE_STRING_POINTER (s) = obstack_copy0 (saveable_obstack, str, len);
1541 /* Return a newly constructed COMPLEX_CST node whose value is
1542 specified by the real and imaginary parts REAL and IMAG.
1543 Both REAL and IMAG should be constant nodes. TYPE, if specified,
1544 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
1547 build_complex (type, real, imag)
1551 register tree t = make_node (COMPLEX_CST);
1553 TREE_REALPART (t) = real;
1554 TREE_IMAGPART (t) = imag;
1555 TREE_TYPE (t) = type ? type : build_complex_type (TREE_TYPE (real));
1556 TREE_OVERFLOW (t) = TREE_OVERFLOW (real) | TREE_OVERFLOW (imag);
1557 TREE_CONSTANT_OVERFLOW (t)
1558 = TREE_CONSTANT_OVERFLOW (real) | TREE_CONSTANT_OVERFLOW (imag);
1562 /* Build a newly constructed TREE_VEC node of length LEN. */
1569 register int length = (len-1) * sizeof (tree) + sizeof (struct tree_vec);
1570 register struct obstack *obstack = current_obstack;
1573 #ifdef GATHER_STATISTICS
1574 tree_node_counts[(int)vec_kind]++;
1575 tree_node_sizes[(int)vec_kind] += length;
1578 t = (tree) obstack_alloc (obstack, length);
1580 for (i = (length / sizeof (int)) - 1; i >= 0; i--)
1583 TREE_SET_CODE (t, TREE_VEC);
1584 TREE_VEC_LENGTH (t) = len;
1585 if (obstack == &permanent_obstack)
1586 TREE_PERMANENT (t) = 1;
1591 /* Return 1 if EXPR is the integer constant zero or a complex constant
1595 integer_zerop (expr)
1600 return ((TREE_CODE (expr) == INTEGER_CST
1601 && ! TREE_CONSTANT_OVERFLOW (expr)
1602 && TREE_INT_CST_LOW (expr) == 0
1603 && TREE_INT_CST_HIGH (expr) == 0)
1604 || (TREE_CODE (expr) == COMPLEX_CST
1605 && integer_zerop (TREE_REALPART (expr))
1606 && integer_zerop (TREE_IMAGPART (expr))));
1609 /* Return 1 if EXPR is the integer constant one or the corresponding
1610 complex constant. */
1618 return ((TREE_CODE (expr) == INTEGER_CST
1619 && ! TREE_CONSTANT_OVERFLOW (expr)
1620 && TREE_INT_CST_LOW (expr) == 1
1621 && TREE_INT_CST_HIGH (expr) == 0)
1622 || (TREE_CODE (expr) == COMPLEX_CST
1623 && integer_onep (TREE_REALPART (expr))
1624 && integer_zerop (TREE_IMAGPART (expr))));
1627 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
1628 it contains. Likewise for the corresponding complex constant. */
1631 integer_all_onesp (expr)
1639 if (TREE_CODE (expr) == COMPLEX_CST
1640 && integer_all_onesp (TREE_REALPART (expr))
1641 && integer_zerop (TREE_IMAGPART (expr)))
1644 else if (TREE_CODE (expr) != INTEGER_CST
1645 || TREE_CONSTANT_OVERFLOW (expr))
1648 uns = TREE_UNSIGNED (TREE_TYPE (expr));
1650 return TREE_INT_CST_LOW (expr) == -1 && TREE_INT_CST_HIGH (expr) == -1;
1652 /* Note that using TYPE_PRECISION here is wrong. We care about the
1653 actual bits, not the (arbitrary) range of the type. */
1654 prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr)));
1655 if (prec >= HOST_BITS_PER_WIDE_INT)
1657 int high_value, shift_amount;
1659 shift_amount = prec - HOST_BITS_PER_WIDE_INT;
1661 if (shift_amount > HOST_BITS_PER_WIDE_INT)
1662 /* Can not handle precisions greater than twice the host int size. */
1664 else if (shift_amount == HOST_BITS_PER_WIDE_INT)
1665 /* Shifting by the host word size is undefined according to the ANSI
1666 standard, so we must handle this as a special case. */
1669 high_value = ((HOST_WIDE_INT) 1 << shift_amount) - 1;
1671 return TREE_INT_CST_LOW (expr) == -1
1672 && TREE_INT_CST_HIGH (expr) == high_value;
1675 return TREE_INT_CST_LOW (expr) == ((HOST_WIDE_INT) 1 << prec) - 1;
1678 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
1682 integer_pow2p (expr)
1686 HOST_WIDE_INT high, low;
1690 if (TREE_CODE (expr) == COMPLEX_CST
1691 && integer_pow2p (TREE_REALPART (expr))
1692 && integer_zerop (TREE_IMAGPART (expr)))
1695 if (TREE_CODE (expr) != INTEGER_CST || TREE_CONSTANT_OVERFLOW (expr))
1698 prec = (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE
1699 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
1700 high = TREE_INT_CST_HIGH (expr);
1701 low = TREE_INT_CST_LOW (expr);
1703 /* First clear all bits that are beyond the type's precision in case
1704 we've been sign extended. */
1706 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
1708 else if (prec > HOST_BITS_PER_WIDE_INT)
1709 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
1713 if (prec < HOST_BITS_PER_WIDE_INT)
1714 low &= ~((HOST_WIDE_INT) (-1) << prec);
1717 if (high == 0 && low == 0)
1720 return ((high == 0 && (low & (low - 1)) == 0)
1721 || (low == 0 && (high & (high - 1)) == 0));
1724 /* Return the power of two represented by a tree node known to be a
1732 HOST_WIDE_INT high, low;
1736 if (TREE_CODE (expr) == COMPLEX_CST)
1737 return tree_log2 (TREE_REALPART (expr));
1739 prec = (TREE_CODE (TREE_TYPE (expr)) == POINTER_TYPE
1740 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
1742 high = TREE_INT_CST_HIGH (expr);
1743 low = TREE_INT_CST_LOW (expr);
1745 /* First clear all bits that are beyond the type's precision in case
1746 we've been sign extended. */
1748 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
1750 else if (prec > HOST_BITS_PER_WIDE_INT)
1751 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
1755 if (prec < HOST_BITS_PER_WIDE_INT)
1756 low &= ~((HOST_WIDE_INT) (-1) << prec);
1759 return (high != 0 ? HOST_BITS_PER_WIDE_INT + exact_log2 (high)
1760 : exact_log2 (low));
1763 /* Return 1 if EXPR is the real constant zero. */
1771 return ((TREE_CODE (expr) == REAL_CST
1772 && ! TREE_CONSTANT_OVERFLOW (expr)
1773 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst0))
1774 || (TREE_CODE (expr) == COMPLEX_CST
1775 && real_zerop (TREE_REALPART (expr))
1776 && real_zerop (TREE_IMAGPART (expr))));
1779 /* Return 1 if EXPR is the real constant one in real or complex form. */
1787 return ((TREE_CODE (expr) == REAL_CST
1788 && ! TREE_CONSTANT_OVERFLOW (expr)
1789 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst1))
1790 || (TREE_CODE (expr) == COMPLEX_CST
1791 && real_onep (TREE_REALPART (expr))
1792 && real_zerop (TREE_IMAGPART (expr))));
1795 /* Return 1 if EXPR is the real constant two. */
1803 return ((TREE_CODE (expr) == REAL_CST
1804 && ! TREE_CONSTANT_OVERFLOW (expr)
1805 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst2))
1806 || (TREE_CODE (expr) == COMPLEX_CST
1807 && real_twop (TREE_REALPART (expr))
1808 && real_zerop (TREE_IMAGPART (expr))));
1811 /* Nonzero if EXP is a constant or a cast of a constant. */
1814 really_constant_p (exp)
1817 /* This is not quite the same as STRIP_NOPS. It does more. */
1818 while (TREE_CODE (exp) == NOP_EXPR
1819 || TREE_CODE (exp) == CONVERT_EXPR
1820 || TREE_CODE (exp) == NON_LVALUE_EXPR)
1821 exp = TREE_OPERAND (exp, 0);
1822 return TREE_CONSTANT (exp);
1825 /* Return first list element whose TREE_VALUE is ELEM.
1826 Return 0 if ELEM is not in LIST. */
1829 value_member (elem, list)
1834 if (elem == TREE_VALUE (list))
1836 list = TREE_CHAIN (list);
1841 /* Return first list element whose TREE_PURPOSE is ELEM.
1842 Return 0 if ELEM is not in LIST. */
1845 purpose_member (elem, list)
1850 if (elem == TREE_PURPOSE (list))
1852 list = TREE_CHAIN (list);
1857 /* Return first list element whose BINFO_TYPE is ELEM.
1858 Return 0 if ELEM is not in LIST. */
1861 binfo_member (elem, list)
1866 if (elem == BINFO_TYPE (list))
1868 list = TREE_CHAIN (list);
1873 /* Return nonzero if ELEM is part of the chain CHAIN. */
1876 chain_member (elem, chain)
1883 chain = TREE_CHAIN (chain);
1889 /* Return nonzero if ELEM is equal to TREE_VALUE (CHAIN) for any piece of
1891 /* ??? This function was added for machine specific attributes but is no
1892 longer used. It could be deleted if we could confirm all front ends
1896 chain_member_value (elem, chain)
1901 if (elem == TREE_VALUE (chain))
1903 chain = TREE_CHAIN (chain);
1909 /* Return nonzero if ELEM is equal to TREE_PURPOSE (CHAIN)
1910 for any piece of chain CHAIN. */
1911 /* ??? This function was added for machine specific attributes but is no
1912 longer used. It could be deleted if we could confirm all front ends
1916 chain_member_purpose (elem, chain)
1921 if (elem == TREE_PURPOSE (chain))
1923 chain = TREE_CHAIN (chain);
1929 /* Return the length of a chain of nodes chained through TREE_CHAIN.
1930 We expect a null pointer to mark the end of the chain.
1931 This is the Lisp primitive `length'. */
1938 register int len = 0;
1940 for (tail = t; tail; tail = TREE_CHAIN (tail))
1946 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
1947 by modifying the last node in chain 1 to point to chain 2.
1948 This is the Lisp primitive `nconc'. */
1960 for (t1 = op1; TREE_CHAIN (t1); t1 = TREE_CHAIN (t1))
1962 TREE_CHAIN (t1) = op2;
1963 for (t2 = op2; t2; t2 = TREE_CHAIN (t2))
1965 abort (); /* Circularity created. */
1971 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
1975 register tree chain;
1979 while (next = TREE_CHAIN (chain))
1984 /* Reverse the order of elements in the chain T,
1985 and return the new head of the chain (old last element). */
1991 register tree prev = 0, decl, next;
1992 for (decl = t; decl; decl = next)
1994 next = TREE_CHAIN (decl);
1995 TREE_CHAIN (decl) = prev;
2001 /* Given a chain CHAIN of tree nodes,
2002 construct and return a list of those nodes. */
2008 tree result = NULL_TREE;
2009 tree in_tail = chain;
2010 tree out_tail = NULL_TREE;
2014 tree next = tree_cons (NULL_TREE, in_tail, NULL_TREE);
2016 TREE_CHAIN (out_tail) = next;
2020 in_tail = TREE_CHAIN (in_tail);
2026 /* Return a newly created TREE_LIST node whose
2027 purpose and value fields are PARM and VALUE. */
2030 build_tree_list (parm, value)
2033 register tree t = make_node (TREE_LIST);
2034 TREE_PURPOSE (t) = parm;
2035 TREE_VALUE (t) = value;
2039 /* Similar, but build on the temp_decl_obstack. */
2042 build_decl_list (parm, value)
2046 register struct obstack *ambient_obstack = current_obstack;
2047 current_obstack = &temp_decl_obstack;
2048 node = build_tree_list (parm, value);
2049 current_obstack = ambient_obstack;
2053 /* Similar, but build on the expression_obstack. */
2056 build_expr_list (parm, value)
2060 register struct obstack *ambient_obstack = current_obstack;
2061 current_obstack = expression_obstack;
2062 node = build_tree_list (parm, value);
2063 current_obstack = ambient_obstack;
2067 /* Return a newly created TREE_LIST node whose
2068 purpose and value fields are PARM and VALUE
2069 and whose TREE_CHAIN is CHAIN. */
2072 tree_cons (purpose, value, chain)
2073 tree purpose, value, chain;
2076 register tree node = make_node (TREE_LIST);
2079 register tree node = (tree) obstack_alloc (current_obstack, sizeof (struct tree_list));
2080 #ifdef GATHER_STATISTICS
2081 tree_node_counts[(int)x_kind]++;
2082 tree_node_sizes[(int)x_kind] += sizeof (struct tree_list);
2085 for (i = (sizeof (struct tree_common) / sizeof (int)) - 1; i >= 0; i--)
2086 ((int *) node)[i] = 0;
2088 TREE_SET_CODE (node, TREE_LIST);
2089 if (current_obstack == &permanent_obstack)
2090 TREE_PERMANENT (node) = 1;
2093 TREE_CHAIN (node) = chain;
2094 TREE_PURPOSE (node) = purpose;
2095 TREE_VALUE (node) = value;
2099 /* Similar, but build on the temp_decl_obstack. */
2102 decl_tree_cons (purpose, value, chain)
2103 tree purpose, value, chain;
2106 register struct obstack *ambient_obstack = current_obstack;
2107 current_obstack = &temp_decl_obstack;
2108 node = tree_cons (purpose, value, chain);
2109 current_obstack = ambient_obstack;
2113 /* Similar, but build on the expression_obstack. */
2116 expr_tree_cons (purpose, value, chain)
2117 tree purpose, value, chain;
2120 register struct obstack *ambient_obstack = current_obstack;
2121 current_obstack = expression_obstack;
2122 node = tree_cons (purpose, value, chain);
2123 current_obstack = ambient_obstack;
2127 /* Same as `tree_cons' but make a permanent object. */
2130 perm_tree_cons (purpose, value, chain)
2131 tree purpose, value, chain;
2134 register struct obstack *ambient_obstack = current_obstack;
2135 current_obstack = &permanent_obstack;
2137 node = tree_cons (purpose, value, chain);
2138 current_obstack = ambient_obstack;
2142 /* Same as `tree_cons', but make this node temporary, regardless. */
2145 temp_tree_cons (purpose, value, chain)
2146 tree purpose, value, chain;
2149 register struct obstack *ambient_obstack = current_obstack;
2150 current_obstack = &temporary_obstack;
2152 node = tree_cons (purpose, value, chain);
2153 current_obstack = ambient_obstack;
2157 /* Same as `tree_cons', but save this node if the function's RTL is saved. */
2160 saveable_tree_cons (purpose, value, chain)
2161 tree purpose, value, chain;
2164 register struct obstack *ambient_obstack = current_obstack;
2165 current_obstack = saveable_obstack;
2167 node = tree_cons (purpose, value, chain);
2168 current_obstack = ambient_obstack;
2172 /* Return the size nominally occupied by an object of type TYPE
2173 when it resides in memory. The value is measured in units of bytes,
2174 and its data type is that normally used for type sizes
2175 (which is the first type created by make_signed_type or
2176 make_unsigned_type). */
2179 size_in_bytes (type)
2184 if (type == error_mark_node)
2185 return integer_zero_node;
2186 type = TYPE_MAIN_VARIANT (type);
2187 if (TYPE_SIZE (type) == 0)
2189 incomplete_type_error (NULL_TREE, type);
2190 return integer_zero_node;
2192 t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type),
2193 size_int (BITS_PER_UNIT));
2194 if (TREE_CODE (t) == INTEGER_CST)
2195 force_fit_type (t, 0);
2199 /* Return the size of TYPE (in bytes) as an integer,
2200 or return -1 if the size can vary. */
2203 int_size_in_bytes (type)
2207 if (type == error_mark_node)
2209 type = TYPE_MAIN_VARIANT (type);
2210 if (TYPE_SIZE (type) == 0)
2212 if (TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
2214 if (TREE_INT_CST_HIGH (TYPE_SIZE (type)) != 0)
2216 tree t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type),
2217 size_int (BITS_PER_UNIT));
2218 return TREE_INT_CST_LOW (t);
2220 size = TREE_INT_CST_LOW (TYPE_SIZE (type));
2221 return (size + BITS_PER_UNIT - 1) / BITS_PER_UNIT;
2224 /* Return, as a tree node, the number of elements for TYPE (which is an
2225 ARRAY_TYPE) minus one. This counts only elements of the top array.
2227 Don't let any SAVE_EXPRs escape; if we are called as part of a cleanup
2228 action, they would get unsaved. */
2231 array_type_nelts (type)
2234 tree index_type, min, max;
2236 /* If they did it with unspecified bounds, then we should have already
2237 given an error about it before we got here. */
2238 if (! TYPE_DOMAIN (type))
2239 return error_mark_node;
2241 index_type = TYPE_DOMAIN (type);
2242 min = TYPE_MIN_VALUE (index_type);
2243 max = TYPE_MAX_VALUE (index_type);
2245 if (! TREE_CONSTANT (min))
2248 if (TREE_CODE (min) == SAVE_EXPR)
2249 min = build (RTL_EXPR, TREE_TYPE (TYPE_MIN_VALUE (index_type)), 0,
2250 SAVE_EXPR_RTL (min));
2252 min = TYPE_MIN_VALUE (index_type);
2255 if (! TREE_CONSTANT (max))
2258 if (TREE_CODE (max) == SAVE_EXPR)
2259 max = build (RTL_EXPR, TREE_TYPE (TYPE_MAX_VALUE (index_type)), 0,
2260 SAVE_EXPR_RTL (max));
2262 max = TYPE_MAX_VALUE (index_type);
2265 return (integer_zerop (min)
2267 : fold (build (MINUS_EXPR, TREE_TYPE (max), max, min)));
2270 /* Return nonzero if arg is static -- a reference to an object in
2271 static storage. This is not the same as the C meaning of `static'. */
2277 switch (TREE_CODE (arg))
2280 /* Nested functions aren't static, since taking their address
2281 involves a trampoline. */
2282 return decl_function_context (arg) == 0 || DECL_NO_STATIC_CHAIN (arg);
2284 return TREE_STATIC (arg) || DECL_EXTERNAL (arg);
2287 return TREE_STATIC (arg);
2292 /* If we are referencing a bitfield, we can't evaluate an
2293 ADDR_EXPR at compile time and so it isn't a constant. */
2295 return (! DECL_BIT_FIELD (TREE_OPERAND (arg, 1))
2296 && staticp (TREE_OPERAND (arg, 0)));
2302 /* This case is technically correct, but results in setting
2303 TREE_CONSTANT on ADDR_EXPRs that cannot be evaluated at
2306 return TREE_CONSTANT (TREE_OPERAND (arg, 0));
2310 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg))) == INTEGER_CST
2311 && TREE_CODE (TREE_OPERAND (arg, 1)) == INTEGER_CST)
2312 return staticp (TREE_OPERAND (arg, 0));
2318 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
2319 Do this to any expression which may be used in more than one place,
2320 but must be evaluated only once.
2322 Normally, expand_expr would reevaluate the expression each time.
2323 Calling save_expr produces something that is evaluated and recorded
2324 the first time expand_expr is called on it. Subsequent calls to
2325 expand_expr just reuse the recorded value.
2327 The call to expand_expr that generates code that actually computes
2328 the value is the first call *at compile time*. Subsequent calls
2329 *at compile time* generate code to use the saved value.
2330 This produces correct result provided that *at run time* control
2331 always flows through the insns made by the first expand_expr
2332 before reaching the other places where the save_expr was evaluated.
2333 You, the caller of save_expr, must make sure this is so.
2335 Constants, and certain read-only nodes, are returned with no
2336 SAVE_EXPR because that is safe. Expressions containing placeholders
2337 are not touched; see tree.def for an explanation of what these
2344 register tree t = fold (expr);
2346 /* We don't care about whether this can be used as an lvalue in this
2348 while (TREE_CODE (t) == NON_LVALUE_EXPR)
2349 t = TREE_OPERAND (t, 0);
2351 /* If the tree evaluates to a constant, then we don't want to hide that
2352 fact (i.e. this allows further folding, and direct checks for constants).
2353 However, a read-only object that has side effects cannot be bypassed.
2354 Since it is no problem to reevaluate literals, we just return the
2357 if (TREE_CONSTANT (t) || (TREE_READONLY (t) && ! TREE_SIDE_EFFECTS (t))
2358 || TREE_CODE (t) == SAVE_EXPR || TREE_CODE (t) == ERROR_MARK)
2361 /* If T contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
2362 it means that the size or offset of some field of an object depends on
2363 the value within another field.
2365 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
2366 and some variable since it would then need to be both evaluated once and
2367 evaluated more than once. Front-ends must assure this case cannot
2368 happen by surrounding any such subexpressions in their own SAVE_EXPR
2369 and forcing evaluation at the proper time. */
2370 if (contains_placeholder_p (t))
2373 t = build (SAVE_EXPR, TREE_TYPE (expr), t, current_function_decl, NULL_TREE);
2375 /* This expression might be placed ahead of a jump to ensure that the
2376 value was computed on both sides of the jump. So make sure it isn't
2377 eliminated as dead. */
2378 TREE_SIDE_EFFECTS (t) = 1;
2382 /* Arrange for an expression to be expanded multiple independent
2383 times. This is useful for cleanup actions, as the backend can
2384 expand them multiple times in different places. */
2392 /* If this is already protected, no sense in protecting it again. */
2393 if (TREE_CODE (expr) == UNSAVE_EXPR)
2396 t = build1 (UNSAVE_EXPR, TREE_TYPE (expr), expr);
2397 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (expr);
2401 /* Modify a tree in place so that all the evaluate only once things
2402 are cleared out. Return the EXPR given. */
2405 unsave_expr_now (expr)
2408 enum tree_code code;
2412 if (expr == NULL_TREE)
2415 code = TREE_CODE (expr);
2416 first_rtl = tree_code_length [(int) code];
2420 SAVE_EXPR_RTL (expr) = 0;
2425 TREE_OPERAND (expr, 1) = TREE_OPERAND (expr, 3);
2426 TREE_OPERAND (expr, 3) = NULL_TREE;
2430 /* I don't yet know how to emit a sequence multiple times. */
2431 if (RTL_EXPR_SEQUENCE (expr) != 0)
2437 CALL_EXPR_RTL (expr) = 0;
2438 if (TREE_OPERAND (expr, 1)
2439 && TREE_CODE (TREE_OPERAND (expr, 1)) == TREE_LIST)
2441 tree exp = TREE_OPERAND (expr, 1);
2444 unsave_expr_now (TREE_VALUE (exp));
2445 exp = TREE_CHAIN (exp);
2451 case WITH_CLEANUP_EXPR:
2452 /* Should be defined to be 2. */
2456 case METHOD_CALL_EXPR:
2461 switch (TREE_CODE_CLASS (code))
2463 case 'c': /* a constant */
2464 case 't': /* a type node */
2465 case 'x': /* something random, like an identifier or an ERROR_MARK. */
2466 case 'd': /* A decl node */
2467 case 'b': /* A block node */
2470 case 'e': /* an expression */
2471 case 'r': /* a reference */
2472 case 's': /* an expression with side effects */
2473 case '<': /* a comparison expression */
2474 case '2': /* a binary arithmetic expression */
2475 case '1': /* a unary arithmetic expression */
2476 for (i = first_rtl - 1; i >= 0; i--)
2477 unsave_expr_now (TREE_OPERAND (expr, i));
2485 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
2486 or offset that depends on a field within a record. */
2489 contains_placeholder_p (exp)
2492 register enum tree_code code = TREE_CODE (exp);
2494 /* If we have a WITH_RECORD_EXPR, it "cancels" any PLACEHOLDER_EXPR
2495 in it since it is supplying a value for it. */
2496 if (code == WITH_RECORD_EXPR)
2498 else if (code == PLACEHOLDER_EXPR)
2501 switch (TREE_CODE_CLASS (code))
2504 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
2505 position computations since they will be converted into a
2506 WITH_RECORD_EXPR involving the reference, which will assume
2507 here will be valid. */
2508 return contains_placeholder_p (TREE_OPERAND (exp, 0));
2516 /* Ignoring the first operand isn't quite right, but works best. */
2517 return contains_placeholder_p (TREE_OPERAND (exp, 1));
2524 return (contains_placeholder_p (TREE_OPERAND (exp, 0))
2525 || contains_placeholder_p (TREE_OPERAND (exp, 1))
2526 || contains_placeholder_p (TREE_OPERAND (exp, 2)));
2529 return (SAVE_EXPR_RTL (exp) == 0
2530 && contains_placeholder_p (TREE_OPERAND (exp, 0)));
2533 switch (tree_code_length[(int) code])
2536 return contains_placeholder_p (TREE_OPERAND (exp, 0));
2538 return (contains_placeholder_p (TREE_OPERAND (exp, 0))
2539 || contains_placeholder_p (TREE_OPERAND (exp, 1)));
2546 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
2547 return a tree with all occurrences of references to F in a
2548 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
2549 contains only arithmetic expressions. */
2552 substitute_in_expr (exp, f, r)
2557 enum tree_code code = TREE_CODE (exp);
2562 switch (TREE_CODE_CLASS (code))
2569 if (code == PLACEHOLDER_EXPR)
2577 switch (tree_code_length[(int) code])
2580 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2581 if (op0 == TREE_OPERAND (exp, 0))
2584 new = fold (build1 (code, TREE_TYPE (exp), op0));
2588 /* An RTL_EXPR cannot contain a PLACEHOLDER_EXPR; a CONSTRUCTOR
2589 could, but we don't support it. */
2590 if (code == RTL_EXPR)
2592 else if (code == CONSTRUCTOR)
2595 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2596 op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
2597 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
2600 new = fold (build (code, TREE_TYPE (exp), op0, op1));
2604 /* It cannot be that anything inside a SAVE_EXPR contains a
2605 PLACEHOLDER_EXPR. */
2606 if (code == SAVE_EXPR)
2609 if (code != COND_EXPR)
2612 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2613 op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
2614 op2 = substitute_in_expr (TREE_OPERAND (exp, 2), f, r);
2615 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
2616 && op2 == TREE_OPERAND (exp, 2))
2619 new = fold (build (code, TREE_TYPE (exp), op0, op1, op2));
2628 /* If this expression is getting a value from a PLACEHOLDER_EXPR
2629 and it is the right field, replace it with R. */
2630 for (inner = TREE_OPERAND (exp, 0);
2631 TREE_CODE_CLASS (TREE_CODE (inner)) == 'r';
2632 inner = TREE_OPERAND (inner, 0))
2634 if (TREE_CODE (inner) == PLACEHOLDER_EXPR
2635 && TREE_OPERAND (exp, 1) == f)
2638 /* If this expression hasn't been completed let, leave it
2640 if (TREE_CODE (inner) == PLACEHOLDER_EXPR
2641 && TREE_TYPE (inner) == 0)
2644 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2645 if (op0 == TREE_OPERAND (exp, 0))
2648 new = fold (build (code, TREE_TYPE (exp), op0,
2649 TREE_OPERAND (exp, 1)));
2653 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2654 op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
2655 op2 = substitute_in_expr (TREE_OPERAND (exp, 2), f, r);
2656 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
2657 && op2 == TREE_OPERAND (exp, 2))
2660 new = fold (build (code, TREE_TYPE (exp), op0, op1, op2));
2665 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2666 if (op0 == TREE_OPERAND (exp, 0))
2669 new = fold (build1 (code, TREE_TYPE (exp), op0));
2674 /* If it wasn't one of the cases we handle, give up. */
2678 TREE_READONLY (new) = TREE_READONLY (exp);
2682 /* Stabilize a reference so that we can use it any number of times
2683 without causing its operands to be evaluated more than once.
2684 Returns the stabilized reference. This works by means of save_expr,
2685 so see the caveats in the comments about save_expr.
2687 Also allows conversion expressions whose operands are references.
2688 Any other kind of expression is returned unchanged. */
2691 stabilize_reference (ref)
2694 register tree result;
2695 register enum tree_code code = TREE_CODE (ref);
2702 /* No action is needed in this case. */
2708 case FIX_TRUNC_EXPR:
2709 case FIX_FLOOR_EXPR:
2710 case FIX_ROUND_EXPR:
2712 result = build_nt (code, stabilize_reference (TREE_OPERAND (ref, 0)));
2716 result = build_nt (INDIRECT_REF,
2717 stabilize_reference_1 (TREE_OPERAND (ref, 0)));
2721 result = build_nt (COMPONENT_REF,
2722 stabilize_reference (TREE_OPERAND (ref, 0)),
2723 TREE_OPERAND (ref, 1));
2727 result = build_nt (BIT_FIELD_REF,
2728 stabilize_reference (TREE_OPERAND (ref, 0)),
2729 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
2730 stabilize_reference_1 (TREE_OPERAND (ref, 2)));
2734 result = build_nt (ARRAY_REF,
2735 stabilize_reference (TREE_OPERAND (ref, 0)),
2736 stabilize_reference_1 (TREE_OPERAND (ref, 1)));
2740 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2741 it wouldn't be ignored. This matters when dealing with
2743 return stabilize_reference_1 (ref);
2746 result = build1 (INDIRECT_REF, TREE_TYPE (ref),
2747 save_expr (build1 (ADDR_EXPR,
2748 build_pointer_type (TREE_TYPE (ref)),
2753 /* If arg isn't a kind of lvalue we recognize, make no change.
2754 Caller should recognize the error for an invalid lvalue. */
2759 return error_mark_node;
2762 TREE_TYPE (result) = TREE_TYPE (ref);
2763 TREE_READONLY (result) = TREE_READONLY (ref);
2764 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (ref);
2765 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);
2766 TREE_RAISES (result) = TREE_RAISES (ref);
2771 /* Subroutine of stabilize_reference; this is called for subtrees of
2772 references. Any expression with side-effects must be put in a SAVE_EXPR
2773 to ensure that it is only evaluated once.
2775 We don't put SAVE_EXPR nodes around everything, because assigning very
2776 simple expressions to temporaries causes us to miss good opportunities
2777 for optimizations. Among other things, the opportunity to fold in the
2778 addition of a constant into an addressing mode often gets lost, e.g.
2779 "y[i+1] += x;". In general, we take the approach that we should not make
2780 an assignment unless we are forced into it - i.e., that any non-side effect
2781 operator should be allowed, and that cse should take care of coalescing
2782 multiple utterances of the same expression should that prove fruitful. */
2785 stabilize_reference_1 (e)
2788 register tree result;
2789 register enum tree_code code = TREE_CODE (e);
2791 /* We cannot ignore const expressions because it might be a reference
2792 to a const array but whose index contains side-effects. But we can
2793 ignore things that are actual constant or that already have been
2794 handled by this function. */
2796 if (TREE_CONSTANT (e) || code == SAVE_EXPR)
2799 switch (TREE_CODE_CLASS (code))
2809 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2810 so that it will only be evaluated once. */
2811 /* The reference (r) and comparison (<) classes could be handled as
2812 below, but it is generally faster to only evaluate them once. */
2813 if (TREE_SIDE_EFFECTS (e))
2814 return save_expr (e);
2818 /* Constants need no processing. In fact, we should never reach
2823 /* Division is slow and tends to be compiled with jumps,
2824 especially the division by powers of 2 that is often
2825 found inside of an array reference. So do it just once. */
2826 if (code == TRUNC_DIV_EXPR || code == TRUNC_MOD_EXPR
2827 || code == FLOOR_DIV_EXPR || code == FLOOR_MOD_EXPR
2828 || code == CEIL_DIV_EXPR || code == CEIL_MOD_EXPR
2829 || code == ROUND_DIV_EXPR || code == ROUND_MOD_EXPR)
2830 return save_expr (e);
2831 /* Recursively stabilize each operand. */
2832 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)),
2833 stabilize_reference_1 (TREE_OPERAND (e, 1)));
2837 /* Recursively stabilize each operand. */
2838 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)));
2845 TREE_TYPE (result) = TREE_TYPE (e);
2846 TREE_READONLY (result) = TREE_READONLY (e);
2847 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (e);
2848 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);
2849 TREE_RAISES (result) = TREE_RAISES (e);
2854 /* Low-level constructors for expressions. */
2856 /* Build an expression of code CODE, data type TYPE,
2857 and operands as specified by the arguments ARG1 and following arguments.
2858 Expressions and reference nodes can be created this way.
2859 Constants, decls, types and misc nodes cannot be. */
2862 build VPROTO((enum tree_code code, tree tt, ...))
2865 enum tree_code code;
2870 register int length;
2876 code = va_arg (p, enum tree_code);
2877 tt = va_arg (p, tree);
2880 t = make_node (code);
2881 length = tree_code_length[(int) code];
2886 /* This is equivalent to the loop below, but faster. */
2887 register tree arg0 = va_arg (p, tree);
2888 register tree arg1 = va_arg (p, tree);
2889 TREE_OPERAND (t, 0) = arg0;
2890 TREE_OPERAND (t, 1) = arg1;
2891 if ((arg0 && TREE_SIDE_EFFECTS (arg0))
2892 || (arg1 && TREE_SIDE_EFFECTS (arg1)))
2893 TREE_SIDE_EFFECTS (t) = 1;
2895 = (arg0 && TREE_RAISES (arg0)) || (arg1 && TREE_RAISES (arg1));
2897 else if (length == 1)
2899 register tree arg0 = va_arg (p, tree);
2901 /* Call build1 for this! */
2902 if (TREE_CODE_CLASS (code) != 's')
2904 TREE_OPERAND (t, 0) = arg0;
2905 if (arg0 && TREE_SIDE_EFFECTS (arg0))
2906 TREE_SIDE_EFFECTS (t) = 1;
2907 TREE_RAISES (t) = (arg0 && TREE_RAISES (arg0));
2911 for (i = 0; i < length; i++)
2913 register tree operand = va_arg (p, tree);
2914 TREE_OPERAND (t, i) = operand;
2917 if (TREE_SIDE_EFFECTS (operand))
2918 TREE_SIDE_EFFECTS (t) = 1;
2919 if (TREE_RAISES (operand))
2920 TREE_RAISES (t) = 1;
2928 /* Same as above, but only builds for unary operators.
2929 Saves lions share of calls to `build'; cuts down use
2930 of varargs, which is expensive for RISC machines. */
2933 build1 (code, type, node)
2934 enum tree_code code;
2938 register struct obstack *obstack = expression_obstack;
2939 register int i, length;
2940 register tree_node_kind kind;
2943 #ifdef GATHER_STATISTICS
2944 if (TREE_CODE_CLASS (code) == 'r')
2950 length = sizeof (struct tree_exp);
2952 t = (tree) obstack_alloc (obstack, length);
2954 #ifdef GATHER_STATISTICS
2955 tree_node_counts[(int)kind]++;
2956 tree_node_sizes[(int)kind] += length;
2959 for (i = (length / sizeof (int)) - 1; i >= 0; i--)
2962 TREE_TYPE (t) = type;
2963 TREE_SET_CODE (t, code);
2965 if (obstack == &permanent_obstack)
2966 TREE_PERMANENT (t) = 1;
2968 TREE_OPERAND (t, 0) = node;
2971 if (TREE_SIDE_EFFECTS (node))
2972 TREE_SIDE_EFFECTS (t) = 1;
2973 if (TREE_RAISES (node))
2974 TREE_RAISES (t) = 1;
2980 /* Similar except don't specify the TREE_TYPE
2981 and leave the TREE_SIDE_EFFECTS as 0.
2982 It is permissible for arguments to be null,
2983 or even garbage if their values do not matter. */
2986 build_nt VPROTO((enum tree_code code, ...))
2989 enum tree_code code;
2993 register int length;
2999 code = va_arg (p, enum tree_code);
3002 t = make_node (code);
3003 length = tree_code_length[(int) code];
3005 for (i = 0; i < length; i++)
3006 TREE_OPERAND (t, i) = va_arg (p, tree);
3012 /* Similar to `build_nt', except we build
3013 on the temp_decl_obstack, regardless. */
3016 build_parse_node VPROTO((enum tree_code code, ...))
3019 enum tree_code code;
3021 register struct obstack *ambient_obstack = expression_obstack;
3024 register int length;
3030 code = va_arg (p, enum tree_code);
3033 expression_obstack = &temp_decl_obstack;
3035 t = make_node (code);
3036 length = tree_code_length[(int) code];
3038 for (i = 0; i < length; i++)
3039 TREE_OPERAND (t, i) = va_arg (p, tree);
3042 expression_obstack = ambient_obstack;
3047 /* Commented out because this wants to be done very
3048 differently. See cp-lex.c. */
3050 build_op_identifier (op1, op2)
3053 register tree t = make_node (OP_IDENTIFIER);
3054 TREE_PURPOSE (t) = op1;
3055 TREE_VALUE (t) = op2;
3060 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
3061 We do NOT enter this node in any sort of symbol table.
3063 layout_decl is used to set up the decl's storage layout.
3064 Other slots are initialized to 0 or null pointers. */
3067 build_decl (code, name, type)
3068 enum tree_code code;
3073 t = make_node (code);
3075 /* if (type == error_mark_node)
3076 type = integer_type_node; */
3077 /* That is not done, deliberately, so that having error_mark_node
3078 as the type can suppress useless errors in the use of this variable. */
3080 DECL_NAME (t) = name;
3081 DECL_ASSEMBLER_NAME (t) = name;
3082 TREE_TYPE (t) = type;
3084 if (code == VAR_DECL || code == PARM_DECL || code == RESULT_DECL)
3086 else if (code == FUNCTION_DECL)
3087 DECL_MODE (t) = FUNCTION_MODE;
3092 /* BLOCK nodes are used to represent the structure of binding contours
3093 and declarations, once those contours have been exited and their contents
3094 compiled. This information is used for outputting debugging info. */
3097 build_block (vars, tags, subblocks, supercontext, chain)
3098 tree vars, tags, subblocks, supercontext, chain;
3100 register tree block = make_node (BLOCK);
3101 BLOCK_VARS (block) = vars;
3102 BLOCK_TYPE_TAGS (block) = tags;
3103 BLOCK_SUBBLOCKS (block) = subblocks;
3104 BLOCK_SUPERCONTEXT (block) = supercontext;
3105 BLOCK_CHAIN (block) = chain;
3109 /* Return a declaration like DDECL except that its DECL_MACHINE_ATTRIBUTE
3113 build_decl_attribute_variant (ddecl, attribute)
3114 tree ddecl, attribute;
3116 DECL_MACHINE_ATTRIBUTES (ddecl) = attribute;
3120 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
3123 Record such modified types already made so we don't make duplicates. */
3126 build_type_attribute_variant (ttype, attribute)
3127 tree ttype, attribute;
3129 if ( ! attribute_list_equal (TYPE_ATTRIBUTES (ttype), attribute))
3131 register int hashcode;
3132 register struct obstack *ambient_obstack = current_obstack;
3135 if (ambient_obstack != &permanent_obstack)
3136 current_obstack = TYPE_OBSTACK (ttype);
3138 ntype = copy_node (ttype);
3139 current_obstack = ambient_obstack;
3141 TYPE_POINTER_TO (ntype) = 0;
3142 TYPE_REFERENCE_TO (ntype) = 0;
3143 TYPE_ATTRIBUTES (ntype) = attribute;
3145 /* Create a new main variant of TYPE. */
3146 TYPE_MAIN_VARIANT (ntype) = ntype;
3147 TYPE_NEXT_VARIANT (ntype) = 0;
3148 TYPE_READONLY (ntype) = TYPE_VOLATILE (ntype) = 0;
3150 hashcode = TYPE_HASH (TREE_CODE (ntype))
3151 + TYPE_HASH (TREE_TYPE (ntype))
3152 + attribute_hash_list (attribute);
3154 switch (TREE_CODE (ntype))
3157 hashcode += TYPE_HASH (TYPE_ARG_TYPES (ntype));
3160 hashcode += TYPE_HASH (TYPE_DOMAIN (ntype));
3163 hashcode += TYPE_HASH (TYPE_MAX_VALUE (ntype));
3166 hashcode += TYPE_HASH (TYPE_PRECISION (ntype));
3170 ntype = type_hash_canon (hashcode, ntype);
3171 ttype = build_type_variant (ntype, TYPE_READONLY (ttype),
3172 TYPE_VOLATILE (ttype));
3178 /* Return a 1 if ATTR_NAME and ATTR_ARGS is valid for either declaration DECL
3179 or type TYPE and 0 otherwise. Validity is determined the configuration
3180 macros VALID_MACHINE_DECL_ATTRIBUTE and VALID_MACHINE_TYPE_ATTRIBUTE. */
3183 valid_machine_attribute (attr_name, attr_args, decl, type)
3184 tree attr_name, attr_args;
3189 tree decl_attr_list = decl != 0 ? DECL_MACHINE_ATTRIBUTES (decl) : 0;
3190 tree type_attr_list = TYPE_ATTRIBUTES (type);
3192 if (TREE_CODE (attr_name) != IDENTIFIER_NODE)
3195 #ifdef VALID_MACHINE_DECL_ATTRIBUTE
3197 && VALID_MACHINE_DECL_ATTRIBUTE (decl, decl_attr_list, attr_name, attr_args))
3199 tree attr = lookup_attribute (IDENTIFIER_POINTER (attr_name),
3202 if (attr != NULL_TREE)
3204 /* Override existing arguments. Declarations are unique so we can
3205 modify this in place. */
3206 TREE_VALUE (attr) = attr_args;
3210 decl_attr_list = tree_cons (attr_name, attr_args, decl_attr_list);
3211 decl = build_decl_attribute_variant (decl, decl_attr_list);
3218 #ifdef VALID_MACHINE_TYPE_ATTRIBUTE
3219 if (VALID_MACHINE_TYPE_ATTRIBUTE (type, type_attr_list, attr_name, attr_args))
3221 tree attr = lookup_attribute (IDENTIFIER_POINTER (attr_name),
3224 if (attr != NULL_TREE)
3226 /* Override existing arguments.
3227 ??? This currently works since attribute arguments are not
3228 included in `attribute_hash_list'. Something more complicated
3229 may be needed in the future. */
3230 TREE_VALUE (attr) = attr_args;
3234 type_attr_list = tree_cons (attr_name, attr_args, type_attr_list);
3235 type = build_type_attribute_variant (type, type_attr_list);
3238 TREE_TYPE (decl) = type;
3242 /* Handle putting a type attribute on pointer-to-function-type by putting
3243 the attribute on the function type. */
3244 else if (TREE_CODE (type) == POINTER_TYPE
3245 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE
3246 && VALID_MACHINE_TYPE_ATTRIBUTE (TREE_TYPE (type), type_attr_list,
3247 attr_name, attr_args))
3249 tree inner_type = TREE_TYPE (type);
3250 tree inner_attr_list = TYPE_ATTRIBUTES (inner_type);
3251 tree attr = lookup_attribute (IDENTIFIER_POINTER (attr_name),
3254 if (attr != NULL_TREE)
3255 TREE_VALUE (attr) = attr_args;
3258 inner_attr_list = tree_cons (attr_name, attr_args, inner_attr_list);
3259 inner_type = build_type_attribute_variant (inner_type,
3264 TREE_TYPE (decl) = build_pointer_type (inner_type);
3273 /* Return non-zero if IDENT is a valid name for attribute ATTR,
3276 We try both `text' and `__text__', ATTR may be either one. */
3277 /* ??? It might be a reasonable simplification to require ATTR to be only
3278 `text'. One might then also require attribute lists to be stored in
3279 their canonicalized form. */
3282 is_attribute_p (attr, ident)
3286 int ident_len, attr_len;
3289 if (TREE_CODE (ident) != IDENTIFIER_NODE)
3292 if (strcmp (attr, IDENTIFIER_POINTER (ident)) == 0)
3295 p = IDENTIFIER_POINTER (ident);
3296 ident_len = strlen (p);
3297 attr_len = strlen (attr);
3299 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
3303 || attr[attr_len - 2] != '_'
3304 || attr[attr_len - 1] != '_')
3306 if (ident_len == attr_len - 4
3307 && strncmp (attr + 2, p, attr_len - 4) == 0)
3312 if (ident_len == attr_len + 4
3313 && p[0] == '_' && p[1] == '_'
3314 && p[ident_len - 2] == '_' && p[ident_len - 1] == '_'
3315 && strncmp (attr, p + 2, attr_len) == 0)
3322 /* Given an attribute name and a list of attributes, return a pointer to the
3323 attribute's list element if the attribute is part of the list, or NULL_TREE
3327 lookup_attribute (attr_name, list)
3333 for (l = list; l; l = TREE_CHAIN (l))
3335 if (TREE_CODE (TREE_PURPOSE (l)) != IDENTIFIER_NODE)
3337 if (is_attribute_p (attr_name, TREE_PURPOSE (l)))
3344 /* Return an attribute list that is the union of a1 and a2. */
3347 merge_attributes (a1, a2)
3348 register tree a1, a2;
3352 /* Either one unset? Take the set one. */
3354 if (! (attributes = a1))
3357 /* One that completely contains the other? Take it. */
3359 else if (a2 && ! attribute_list_contained (a1, a2))
3360 if (attribute_list_contained (a2, a1))
3364 /* Pick the longest list, and hang on the other list. */
3365 /* ??? For the moment we punt on the issue of attrs with args. */
3367 if (list_length (a1) < list_length (a2))
3368 attributes = a2, a2 = a1;
3370 for (; a2; a2 = TREE_CHAIN (a2))
3371 if (lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)),
3372 attributes) == NULL_TREE)
3374 a1 = copy_node (a2);
3375 TREE_CHAIN (a1) = attributes;
3382 /* Return a type like TYPE except that its TYPE_READONLY is CONSTP
3383 and its TYPE_VOLATILE is VOLATILEP.
3385 Such variant types already made are recorded so that duplicates
3388 A variant types should never be used as the type of an expression.
3389 Always copy the variant information into the TREE_READONLY
3390 and TREE_THIS_VOLATILE of the expression, and then give the expression
3391 as its type the "main variant", the variant whose TYPE_READONLY
3392 and TYPE_VOLATILE are zero. Use TYPE_MAIN_VARIANT to find the
3396 build_type_variant (type, constp, volatilep)
3398 int constp, volatilep;
3402 /* Treat any nonzero argument as 1. */
3404 volatilep = !!volatilep;
3406 /* Search the chain of variants to see if there is already one there just
3407 like the one we need to have. If so, use that existing one. We must
3408 preserve the TYPE_NAME, since there is code that depends on this. */
3410 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
3411 if (constp == TYPE_READONLY (t) && volatilep == TYPE_VOLATILE (t)
3412 && TYPE_NAME (t) == TYPE_NAME (type))
3415 /* We need a new one. */
3417 t = build_type_copy (type);
3418 TYPE_READONLY (t) = constp;
3419 TYPE_VOLATILE (t) = volatilep;
3424 /* Create a new variant of TYPE, equivalent but distinct.
3425 This is so the caller can modify it. */
3428 build_type_copy (type)
3431 register tree t, m = TYPE_MAIN_VARIANT (type);
3432 register struct obstack *ambient_obstack = current_obstack;
3434 current_obstack = TYPE_OBSTACK (type);
3435 t = copy_node (type);
3436 current_obstack = ambient_obstack;
3438 TYPE_POINTER_TO (t) = 0;
3439 TYPE_REFERENCE_TO (t) = 0;
3441 /* Add this type to the chain of variants of TYPE. */
3442 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (m);
3443 TYPE_NEXT_VARIANT (m) = t;
3448 /* Hashing of types so that we don't make duplicates.
3449 The entry point is `type_hash_canon'. */
3451 /* Each hash table slot is a bucket containing a chain
3452 of these structures. */
3456 struct type_hash *next; /* Next structure in the bucket. */
3457 int hashcode; /* Hash code of this type. */
3458 tree type; /* The type recorded here. */
3461 /* Now here is the hash table. When recording a type, it is added
3462 to the slot whose index is the hash code mod the table size.
3463 Note that the hash table is used for several kinds of types
3464 (function types, array types and array index range types, for now).
3465 While all these live in the same table, they are completely independent,
3466 and the hash code is computed differently for each of these. */
3468 #define TYPE_HASH_SIZE 59
3469 struct type_hash *type_hash_table[TYPE_HASH_SIZE];
3471 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
3472 with types in the TREE_VALUE slots), by adding the hash codes
3473 of the individual types. */
3476 type_hash_list (list)
3479 register int hashcode;
3481 for (hashcode = 0, tail = list; tail; tail = TREE_CHAIN (tail))
3482 hashcode += TYPE_HASH (TREE_VALUE (tail));
3486 /* Look in the type hash table for a type isomorphic to TYPE.
3487 If one is found, return it. Otherwise return 0. */
3490 type_hash_lookup (hashcode, type)
3494 register struct type_hash *h;
3495 for (h = type_hash_table[hashcode % TYPE_HASH_SIZE]; h; h = h->next)
3496 if (h->hashcode == hashcode
3497 && TREE_CODE (h->type) == TREE_CODE (type)
3498 && TREE_TYPE (h->type) == TREE_TYPE (type)
3499 && attribute_list_equal (TYPE_ATTRIBUTES (h->type),
3500 TYPE_ATTRIBUTES (type))
3501 && (TYPE_MAX_VALUE (h->type) == TYPE_MAX_VALUE (type)
3502 || tree_int_cst_equal (TYPE_MAX_VALUE (h->type),
3503 TYPE_MAX_VALUE (type)))
3504 && (TYPE_MIN_VALUE (h->type) == TYPE_MIN_VALUE (type)
3505 || tree_int_cst_equal (TYPE_MIN_VALUE (h->type),
3506 TYPE_MIN_VALUE (type)))
3507 /* Note that TYPE_DOMAIN is TYPE_ARG_TYPES for FUNCTION_TYPE. */
3508 && (TYPE_DOMAIN (h->type) == TYPE_DOMAIN (type)
3509 || (TYPE_DOMAIN (h->type)
3510 && TREE_CODE (TYPE_DOMAIN (h->type)) == TREE_LIST
3511 && TYPE_DOMAIN (type)
3512 && TREE_CODE (TYPE_DOMAIN (type)) == TREE_LIST
3513 && type_list_equal (TYPE_DOMAIN (h->type),
3514 TYPE_DOMAIN (type)))))
3519 /* Add an entry to the type-hash-table
3520 for a type TYPE whose hash code is HASHCODE. */
3523 type_hash_add (hashcode, type)
3527 register struct type_hash *h;
3529 h = (struct type_hash *) oballoc (sizeof (struct type_hash));
3530 h->hashcode = hashcode;
3532 h->next = type_hash_table[hashcode % TYPE_HASH_SIZE];
3533 type_hash_table[hashcode % TYPE_HASH_SIZE] = h;
3536 /* Given TYPE, and HASHCODE its hash code, return the canonical
3537 object for an identical type if one already exists.
3538 Otherwise, return TYPE, and record it as the canonical object
3539 if it is a permanent object.
3541 To use this function, first create a type of the sort you want.
3542 Then compute its hash code from the fields of the type that
3543 make it different from other similar types.
3544 Then call this function and use the value.
3545 This function frees the type you pass in if it is a duplicate. */
3547 /* Set to 1 to debug without canonicalization. Never set by program. */
3548 int debug_no_type_hash = 0;
3551 type_hash_canon (hashcode, type)
3557 if (debug_no_type_hash)
3560 t1 = type_hash_lookup (hashcode, type);
3563 obstack_free (TYPE_OBSTACK (type), type);
3564 #ifdef GATHER_STATISTICS
3565 tree_node_counts[(int)t_kind]--;
3566 tree_node_sizes[(int)t_kind] -= sizeof (struct tree_type);
3571 /* If this is a permanent type, record it for later reuse. */
3572 if (TREE_PERMANENT (type))
3573 type_hash_add (hashcode, type);
3578 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
3579 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
3580 by adding the hash codes of the individual attributes. */
3583 attribute_hash_list (list)
3586 register int hashcode;
3588 for (hashcode = 0, tail = list; tail; tail = TREE_CHAIN (tail))
3589 /* ??? Do we want to add in TREE_VALUE too? */
3590 hashcode += TYPE_HASH (TREE_PURPOSE (tail));
3594 /* Given two lists of attributes, return true if list l2 is
3595 equivalent to l1. */
3598 attribute_list_equal (l1, l2)
3601 return attribute_list_contained (l1, l2)
3602 && attribute_list_contained (l2, l1);
3605 /* Given two lists of attributes, return true if list L2 is
3606 completely contained within L1. */
3607 /* ??? This would be faster if attribute names were stored in a canonicalized
3608 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
3609 must be used to show these elements are equivalent (which they are). */
3610 /* ??? It's not clear that attributes with arguments will always be handled
3614 attribute_list_contained (l1, l2)
3617 register tree t1, t2;
3619 /* First check the obvious, maybe the lists are identical. */
3623 /* Maybe the lists are similar. */
3624 for (t1 = l1, t2 = l2;
3626 && TREE_PURPOSE (t1) == TREE_PURPOSE (t2)
3627 && TREE_VALUE (t1) == TREE_VALUE (t2);
3628 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2));
3630 /* Maybe the lists are equal. */
3631 if (t1 == 0 && t2 == 0)
3634 for (; t2; t2 = TREE_CHAIN (t2))
3637 = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)), l1);
3639 if (attr == NULL_TREE)
3641 if (simple_cst_equal (TREE_VALUE (t2), TREE_VALUE (attr)) != 1)
3648 /* Given two lists of types
3649 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
3650 return 1 if the lists contain the same types in the same order.
3651 Also, the TREE_PURPOSEs must match. */
3654 type_list_equal (l1, l2)
3657 register tree t1, t2;
3659 for (t1 = l1, t2 = l2; t1 && t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
3660 if (TREE_VALUE (t1) != TREE_VALUE (t2)
3661 || (TREE_PURPOSE (t1) != TREE_PURPOSE (t2)
3662 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2))
3663 && (TREE_TYPE (TREE_PURPOSE (t1))
3664 == TREE_TYPE (TREE_PURPOSE (t2))))))
3670 /* Nonzero if integer constants T1 and T2
3671 represent the same constant value. */
3674 tree_int_cst_equal (t1, t2)
3679 if (t1 == 0 || t2 == 0)
3681 if (TREE_CODE (t1) == INTEGER_CST
3682 && TREE_CODE (t2) == INTEGER_CST
3683 && TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
3684 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2))
3689 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
3690 The precise way of comparison depends on their data type. */
3693 tree_int_cst_lt (t1, t2)
3699 if (!TREE_UNSIGNED (TREE_TYPE (t1)))
3700 return INT_CST_LT (t1, t2);
3701 return INT_CST_LT_UNSIGNED (t1, t2);
3704 /* Return an indication of the sign of the integer constant T.
3705 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
3706 Note that -1 will never be returned it T's type is unsigned. */
3709 tree_int_cst_sgn (t)
3712 if (TREE_INT_CST_LOW (t) == 0 && TREE_INT_CST_HIGH (t) == 0)
3714 else if (TREE_UNSIGNED (TREE_TYPE (t)))
3716 else if (TREE_INT_CST_HIGH (t) < 0)
3722 /* Compare two constructor-element-type constants. Return 1 if the lists
3723 are known to be equal; otherwise return 0. */
3726 simple_cst_list_equal (l1, l2)
3729 while (l1 != NULL_TREE && l2 != NULL_TREE)
3731 if (simple_cst_equal (TREE_VALUE (l1), TREE_VALUE (l2)) != 1)
3734 l1 = TREE_CHAIN (l1);
3735 l2 = TREE_CHAIN (l2);
3741 /* Return truthvalue of whether T1 is the same tree structure as T2.
3742 Return 1 if they are the same.
3743 Return 0 if they are understandably different.
3744 Return -1 if either contains tree structure not understood by
3748 simple_cst_equal (t1, t2)
3751 register enum tree_code code1, code2;
3756 if (t1 == 0 || t2 == 0)
3759 code1 = TREE_CODE (t1);
3760 code2 = TREE_CODE (t2);
3762 if (code1 == NOP_EXPR || code1 == CONVERT_EXPR || code1 == NON_LVALUE_EXPR)
3763 if (code2 == NOP_EXPR || code2 == CONVERT_EXPR || code2 == NON_LVALUE_EXPR)
3764 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3766 return simple_cst_equal (TREE_OPERAND (t1, 0), t2);
3767 else if (code2 == NOP_EXPR || code2 == CONVERT_EXPR
3768 || code2 == NON_LVALUE_EXPR)
3769 return simple_cst_equal (t1, TREE_OPERAND (t2, 0));
3777 return TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
3778 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2);
3781 return REAL_VALUES_EQUAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
3784 return TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
3785 && !bcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
3786 TREE_STRING_LENGTH (t1));
3792 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3795 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3798 return simple_cst_list_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
3801 /* Special case: if either target is an unallocated VAR_DECL,
3802 it means that it's going to be unified with whatever the
3803 TARGET_EXPR is really supposed to initialize, so treat it
3804 as being equivalent to anything. */
3805 if ((TREE_CODE (TREE_OPERAND (t1, 0)) == VAR_DECL
3806 && DECL_NAME (TREE_OPERAND (t1, 0)) == NULL_TREE
3807 && DECL_RTL (TREE_OPERAND (t1, 0)) == 0)
3808 || (TREE_CODE (TREE_OPERAND (t2, 0)) == VAR_DECL
3809 && DECL_NAME (TREE_OPERAND (t2, 0)) == NULL_TREE
3810 && DECL_RTL (TREE_OPERAND (t2, 0)) == 0))
3813 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3816 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
3818 case WITH_CLEANUP_EXPR:
3819 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3822 return simple_cst_equal (TREE_OPERAND (t1, 2), TREE_OPERAND (t1, 2));
3825 if (TREE_OPERAND (t1, 1) == TREE_OPERAND (t2, 1))
3826 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3836 /* This general rule works for most tree codes. All exceptions should be
3837 handled above. If this is a language-specific tree code, we can't
3838 trust what might be in the operand, so say we don't know
3841 >= sizeof standard_tree_code_type / sizeof standard_tree_code_type[0])
3844 switch (TREE_CODE_CLASS (code1))
3854 for (i=0; i<tree_code_length[(int) code1]; ++i)
3856 cmp = simple_cst_equal (TREE_OPERAND (t1, i), TREE_OPERAND (t2, i));
3866 /* Constructors for pointer, array and function types.
3867 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
3868 constructed by language-dependent code, not here.) */
3870 /* Construct, lay out and return the type of pointers to TO_TYPE.
3871 If such a type has already been constructed, reuse it. */
3874 build_pointer_type (to_type)
3877 register tree t = TYPE_POINTER_TO (to_type);
3879 /* First, if we already have a type for pointers to TO_TYPE, use it. */
3884 /* We need a new one. Put this in the same obstack as TO_TYPE. */
3885 push_obstacks (TYPE_OBSTACK (to_type), TYPE_OBSTACK (to_type));
3886 t = make_node (POINTER_TYPE);
3889 TREE_TYPE (t) = to_type;
3891 /* Record this type as the pointer to TO_TYPE. */
3892 TYPE_POINTER_TO (to_type) = t;
3894 /* Lay out the type. This function has many callers that are concerned
3895 with expression-construction, and this simplifies them all.
3896 Also, it guarantees the TYPE_SIZE is in the same obstack as the type. */
3902 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
3903 MAXVAL should be the maximum value in the domain
3904 (one less than the length of the array). */
3907 build_index_type (maxval)
3910 register tree itype = make_node (INTEGER_TYPE);
3912 TYPE_PRECISION (itype) = TYPE_PRECISION (sizetype);
3913 TYPE_MIN_VALUE (itype) = size_zero_node;
3915 push_obstacks (TYPE_OBSTACK (itype), TYPE_OBSTACK (itype));
3916 TYPE_MAX_VALUE (itype) = convert (sizetype, maxval);
3919 TYPE_MODE (itype) = TYPE_MODE (sizetype);
3920 TYPE_SIZE (itype) = TYPE_SIZE (sizetype);
3921 TYPE_ALIGN (itype) = TYPE_ALIGN (sizetype);
3922 if (TREE_CODE (maxval) == INTEGER_CST)
3924 int maxint = (int) TREE_INT_CST_LOW (maxval);
3925 /* If the domain should be empty, make sure the maxval
3926 remains -1 and is not spoiled by truncation. */
3927 if (INT_CST_LT (maxval, integer_zero_node))
3929 TYPE_MAX_VALUE (itype) = build_int_2 (-1, -1);
3930 TREE_TYPE (TYPE_MAX_VALUE (itype)) = sizetype;
3932 return type_hash_canon (maxint < 0 ? ~maxint : maxint, itype);
3938 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
3939 ENUMERAL_TYPE, BOOLEAN_TYPE, or CHAR_TYPE), with
3940 low bound LOWVAL and high bound HIGHVAL.
3941 if TYPE==NULL_TREE, sizetype is used. */
3944 build_range_type (type, lowval, highval)
3945 tree type, lowval, highval;
3947 register tree itype = make_node (INTEGER_TYPE);
3949 TREE_TYPE (itype) = type;
3950 if (type == NULL_TREE)
3953 push_obstacks (TYPE_OBSTACK (itype), TYPE_OBSTACK (itype));
3954 TYPE_MIN_VALUE (itype) = convert (type, lowval);
3955 TYPE_MAX_VALUE (itype) = convert (type, highval);
3958 TYPE_PRECISION (itype) = TYPE_PRECISION (type);
3959 TYPE_MODE (itype) = TYPE_MODE (type);
3960 TYPE_SIZE (itype) = TYPE_SIZE (type);
3961 TYPE_ALIGN (itype) = TYPE_ALIGN (type);
3962 if ((TREE_CODE (lowval) == INTEGER_CST)
3963 && (TREE_CODE (highval) == INTEGER_CST))
3965 HOST_WIDE_INT highint = TREE_INT_CST_LOW (highval);
3966 HOST_WIDE_INT lowint = TREE_INT_CST_LOW (lowval);
3967 int maxint = (int) (highint - lowint);
3968 return type_hash_canon (maxint < 0 ? ~maxint : maxint, itype);
3974 /* Just like build_index_type, but takes lowval and highval instead
3975 of just highval (maxval). */
3978 build_index_2_type (lowval,highval)
3979 tree lowval, highval;
3981 return build_range_type (NULL_TREE, lowval, highval);
3984 /* Return nonzero iff ITYPE1 and ITYPE2 are equal (in the LISP sense).
3985 Needed because when index types are not hashed, equal index types
3986 built at different times appear distinct, even though structurally,
3990 index_type_equal (itype1, itype2)
3991 tree itype1, itype2;
3993 if (TREE_CODE (itype1) != TREE_CODE (itype2))
3995 if (TREE_CODE (itype1) == INTEGER_TYPE)
3997 if (TYPE_PRECISION (itype1) != TYPE_PRECISION (itype2)
3998 || TYPE_MODE (itype1) != TYPE_MODE (itype2)
3999 || simple_cst_equal (TYPE_SIZE (itype1), TYPE_SIZE (itype2)) != 1
4000 || TYPE_ALIGN (itype1) != TYPE_ALIGN (itype2))
4002 if (1 == simple_cst_equal (TYPE_MIN_VALUE (itype1),
4003 TYPE_MIN_VALUE (itype2))
4004 && 1 == simple_cst_equal (TYPE_MAX_VALUE (itype1),
4005 TYPE_MAX_VALUE (itype2)))
4012 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
4013 and number of elements specified by the range of values of INDEX_TYPE.
4014 If such a type has already been constructed, reuse it. */
4017 build_array_type (elt_type, index_type)
4018 tree elt_type, index_type;
4023 if (TREE_CODE (elt_type) == FUNCTION_TYPE)
4025 error ("arrays of functions are not meaningful");
4026 elt_type = integer_type_node;
4029 /* Make sure TYPE_POINTER_TO (elt_type) is filled in. */
4030 build_pointer_type (elt_type);
4032 /* Allocate the array after the pointer type,
4033 in case we free it in type_hash_canon. */
4034 t = make_node (ARRAY_TYPE);
4035 TREE_TYPE (t) = elt_type;
4036 TYPE_DOMAIN (t) = index_type;
4038 if (index_type == 0)
4043 hashcode = TYPE_HASH (elt_type) + TYPE_HASH (index_type);
4044 t = type_hash_canon (hashcode, t);
4046 if (TYPE_SIZE (t) == 0)
4051 /* Construct, lay out and return
4052 the type of functions returning type VALUE_TYPE
4053 given arguments of types ARG_TYPES.
4054 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
4055 are data type nodes for the arguments of the function.
4056 If such a type has already been constructed, reuse it. */
4059 build_function_type (value_type, arg_types)
4060 tree value_type, arg_types;
4065 if (TREE_CODE (value_type) == FUNCTION_TYPE)
4067 error ("function return type cannot be function");
4068 value_type = integer_type_node;
4071 /* Make a node of the sort we want. */
4072 t = make_node (FUNCTION_TYPE);
4073 TREE_TYPE (t) = value_type;
4074 TYPE_ARG_TYPES (t) = arg_types;
4076 /* If we already have such a type, use the old one and free this one. */
4077 hashcode = TYPE_HASH (value_type) + type_hash_list (arg_types);
4078 t = type_hash_canon (hashcode, t);
4080 if (TYPE_SIZE (t) == 0)
4085 /* Build the node for the type of references-to-TO_TYPE. */
4088 build_reference_type (to_type)
4091 register tree t = TYPE_REFERENCE_TO (to_type);
4092 register struct obstack *ambient_obstack = current_obstack;
4093 register struct obstack *ambient_saveable_obstack = saveable_obstack;
4095 /* First, if we already have a type for pointers to TO_TYPE, use it. */
4100 /* We need a new one. If TO_TYPE is permanent, make this permanent too. */
4101 if (TREE_PERMANENT (to_type))
4103 current_obstack = &permanent_obstack;
4104 saveable_obstack = &permanent_obstack;
4107 t = make_node (REFERENCE_TYPE);
4108 TREE_TYPE (t) = to_type;
4110 /* Record this type as the pointer to TO_TYPE. */
4111 TYPE_REFERENCE_TO (to_type) = t;
4115 current_obstack = ambient_obstack;
4116 saveable_obstack = ambient_saveable_obstack;
4120 /* Construct, lay out and return the type of methods belonging to class
4121 BASETYPE and whose arguments and values are described by TYPE.
4122 If that type exists already, reuse it.
4123 TYPE must be a FUNCTION_TYPE node. */
4126 build_method_type (basetype, type)
4127 tree basetype, type;
4132 /* Make a node of the sort we want. */
4133 t = make_node (METHOD_TYPE);
4135 if (TREE_CODE (type) != FUNCTION_TYPE)
4138 TYPE_METHOD_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
4139 TREE_TYPE (t) = TREE_TYPE (type);
4141 /* The actual arglist for this function includes a "hidden" argument
4142 which is "this". Put it into the list of argument types. */
4145 = tree_cons (NULL_TREE,
4146 build_pointer_type (basetype), TYPE_ARG_TYPES (type));
4148 /* If we already have such a type, use the old one and free this one. */
4149 hashcode = TYPE_HASH (basetype) + TYPE_HASH (type);
4150 t = type_hash_canon (hashcode, t);
4152 if (TYPE_SIZE (t) == 0)
4158 /* Construct, lay out and return the type of offsets to a value
4159 of type TYPE, within an object of type BASETYPE.
4160 If a suitable offset type exists already, reuse it. */
4163 build_offset_type (basetype, type)
4164 tree basetype, type;
4169 /* Make a node of the sort we want. */
4170 t = make_node (OFFSET_TYPE);
4172 TYPE_OFFSET_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
4173 TREE_TYPE (t) = type;
4175 /* If we already have such a type, use the old one and free this one. */
4176 hashcode = TYPE_HASH (basetype) + TYPE_HASH (type);
4177 t = type_hash_canon (hashcode, t);
4179 if (TYPE_SIZE (t) == 0)
4185 /* Create a complex type whose components are COMPONENT_TYPE. */
4188 build_complex_type (component_type)
4189 tree component_type;
4194 /* Make a node of the sort we want. */
4195 t = make_node (COMPLEX_TYPE);
4197 TREE_TYPE (t) = TYPE_MAIN_VARIANT (component_type);
4198 TYPE_VOLATILE (t) = TYPE_VOLATILE (component_type);
4199 TYPE_READONLY (t) = TYPE_READONLY (component_type);
4201 /* If we already have such a type, use the old one and free this one. */
4202 hashcode = TYPE_HASH (component_type);
4203 t = type_hash_canon (hashcode, t);
4205 if (TYPE_SIZE (t) == 0)
4211 /* Return OP, stripped of any conversions to wider types as much as is safe.
4212 Converting the value back to OP's type makes a value equivalent to OP.
4214 If FOR_TYPE is nonzero, we return a value which, if converted to
4215 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
4217 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
4218 narrowest type that can hold the value, even if they don't exactly fit.
4219 Otherwise, bit-field references are changed to a narrower type
4220 only if they can be fetched directly from memory in that type.
4222 OP must have integer, real or enumeral type. Pointers are not allowed!
4224 There are some cases where the obvious value we could return
4225 would regenerate to OP if converted to OP's type,
4226 but would not extend like OP to wider types.
4227 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
4228 For example, if OP is (unsigned short)(signed char)-1,
4229 we avoid returning (signed char)-1 if FOR_TYPE is int,
4230 even though extending that to an unsigned short would regenerate OP,
4231 since the result of extending (signed char)-1 to (int)
4232 is different from (int) OP. */
4235 get_unwidened (op, for_type)
4239 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
4240 /* TYPE_PRECISION is safe in place of type_precision since
4241 pointer types are not allowed. */
4242 register tree type = TREE_TYPE (op);
4243 register unsigned final_prec
4244 = TYPE_PRECISION (for_type != 0 ? for_type : type);
4246 = (for_type != 0 && for_type != type
4247 && final_prec > TYPE_PRECISION (type)
4248 && TREE_UNSIGNED (type));
4249 register tree win = op;
4251 while (TREE_CODE (op) == NOP_EXPR)
4253 register int bitschange
4254 = TYPE_PRECISION (TREE_TYPE (op))
4255 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0)));
4257 /* Truncations are many-one so cannot be removed.
4258 Unless we are later going to truncate down even farther. */
4260 && final_prec > TYPE_PRECISION (TREE_TYPE (op)))
4263 /* See what's inside this conversion. If we decide to strip it,
4265 op = TREE_OPERAND (op, 0);
4267 /* If we have not stripped any zero-extensions (uns is 0),
4268 we can strip any kind of extension.
4269 If we have previously stripped a zero-extension,
4270 only zero-extensions can safely be stripped.
4271 Any extension can be stripped if the bits it would produce
4272 are all going to be discarded later by truncating to FOR_TYPE. */
4276 if (! uns || final_prec <= TYPE_PRECISION (TREE_TYPE (op)))
4278 /* TREE_UNSIGNED says whether this is a zero-extension.
4279 Let's avoid computing it if it does not affect WIN
4280 and if UNS will not be needed again. */
4281 if ((uns || TREE_CODE (op) == NOP_EXPR)
4282 && TREE_UNSIGNED (TREE_TYPE (op)))
4290 if (TREE_CODE (op) == COMPONENT_REF
4291 /* Since type_for_size always gives an integer type. */
4292 && TREE_CODE (type) != REAL_TYPE
4293 /* Don't crash if field not layed out yet. */
4294 && DECL_SIZE (TREE_OPERAND (op, 1)) != 0)
4296 unsigned innerprec = TREE_INT_CST_LOW (DECL_SIZE (TREE_OPERAND (op, 1)));
4297 type = type_for_size (innerprec, TREE_UNSIGNED (TREE_OPERAND (op, 1)));
4299 /* We can get this structure field in the narrowest type it fits in.
4300 If FOR_TYPE is 0, do this only for a field that matches the
4301 narrower type exactly and is aligned for it
4302 The resulting extension to its nominal type (a fullword type)
4303 must fit the same conditions as for other extensions. */
4305 if (innerprec < TYPE_PRECISION (TREE_TYPE (op))
4306 && (for_type || ! DECL_BIT_FIELD (TREE_OPERAND (op, 1)))
4307 && (! uns || final_prec <= innerprec
4308 || TREE_UNSIGNED (TREE_OPERAND (op, 1)))
4311 win = build (COMPONENT_REF, type, TREE_OPERAND (op, 0),
4312 TREE_OPERAND (op, 1));
4313 TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op);
4314 TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op);
4315 TREE_RAISES (win) = TREE_RAISES (op);
4321 /* Return OP or a simpler expression for a narrower value
4322 which can be sign-extended or zero-extended to give back OP.
4323 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
4324 or 0 if the value should be sign-extended. */
4327 get_narrower (op, unsignedp_ptr)
4331 register int uns = 0;
4333 register tree win = op;
4335 while (TREE_CODE (op) == NOP_EXPR)
4337 register int bitschange
4338 = TYPE_PRECISION (TREE_TYPE (op))
4339 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0)));
4341 /* Truncations are many-one so cannot be removed. */
4345 /* See what's inside this conversion. If we decide to strip it,
4347 op = TREE_OPERAND (op, 0);
4351 /* An extension: the outermost one can be stripped,
4352 but remember whether it is zero or sign extension. */
4354 uns = TREE_UNSIGNED (TREE_TYPE (op));
4355 /* Otherwise, if a sign extension has been stripped,
4356 only sign extensions can now be stripped;
4357 if a zero extension has been stripped, only zero-extensions. */
4358 else if (uns != TREE_UNSIGNED (TREE_TYPE (op)))
4362 else /* bitschange == 0 */
4364 /* A change in nominal type can always be stripped, but we must
4365 preserve the unsignedness. */
4367 uns = TREE_UNSIGNED (TREE_TYPE (op));
4374 if (TREE_CODE (op) == COMPONENT_REF
4375 /* Since type_for_size always gives an integer type. */
4376 && TREE_CODE (TREE_TYPE (op)) != REAL_TYPE)
4378 unsigned innerprec = TREE_INT_CST_LOW (DECL_SIZE (TREE_OPERAND (op, 1)));
4379 tree type = type_for_size (innerprec, TREE_UNSIGNED (op));
4381 /* We can get this structure field in a narrower type that fits it,
4382 but the resulting extension to its nominal type (a fullword type)
4383 must satisfy the same conditions as for other extensions.
4385 Do this only for fields that are aligned (not bit-fields),
4386 because when bit-field insns will be used there is no
4387 advantage in doing this. */
4389 if (innerprec < TYPE_PRECISION (TREE_TYPE (op))
4390 && ! DECL_BIT_FIELD (TREE_OPERAND (op, 1))
4391 && (first || uns == TREE_UNSIGNED (TREE_OPERAND (op, 1)))
4395 uns = TREE_UNSIGNED (TREE_OPERAND (op, 1));
4396 win = build (COMPONENT_REF, type, TREE_OPERAND (op, 0),
4397 TREE_OPERAND (op, 1));
4398 TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op);
4399 TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op);
4400 TREE_RAISES (win) = TREE_RAISES (op);
4403 *unsignedp_ptr = uns;
4407 /* Return the precision of a type, for arithmetic purposes.
4408 Supports all types on which arithmetic is possible
4409 (including pointer types).
4410 It's not clear yet what will be right for complex types. */
4413 type_precision (type)
4416 return ((TREE_CODE (type) == INTEGER_TYPE
4417 || TREE_CODE (type) == ENUMERAL_TYPE
4418 || TREE_CODE (type) == REAL_TYPE)
4419 ? TYPE_PRECISION (type) : POINTER_SIZE);
4422 /* Nonzero if integer constant C has a value that is permissible
4423 for type TYPE (an INTEGER_TYPE). */
4426 int_fits_type_p (c, type)
4429 if (TREE_UNSIGNED (type))
4430 return (! (TREE_CODE (TYPE_MAX_VALUE (type)) == INTEGER_CST
4431 && INT_CST_LT_UNSIGNED (TYPE_MAX_VALUE (type), c))
4432 && ! (TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST
4433 && INT_CST_LT_UNSIGNED (c, TYPE_MIN_VALUE (type)))
4434 /* Negative ints never fit unsigned types. */
4435 && ! (TREE_INT_CST_HIGH (c) < 0
4436 && ! TREE_UNSIGNED (TREE_TYPE (c))));
4438 return (! (TREE_CODE (TYPE_MAX_VALUE (type)) == INTEGER_CST
4439 && INT_CST_LT (TYPE_MAX_VALUE (type), c))
4440 && ! (TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST
4441 && INT_CST_LT (c, TYPE_MIN_VALUE (type)))
4442 /* Unsigned ints with top bit set never fit signed types. */
4443 && ! (TREE_INT_CST_HIGH (c) < 0
4444 && TREE_UNSIGNED (TREE_TYPE (c))));
4447 /* Return the innermost context enclosing DECL that is
4448 a FUNCTION_DECL, or zero if none. */
4451 decl_function_context (decl)
4456 if (TREE_CODE (decl) == ERROR_MARK)
4459 if (TREE_CODE (decl) == SAVE_EXPR)
4460 context = SAVE_EXPR_CONTEXT (decl);
4462 context = DECL_CONTEXT (decl);
4464 while (context && TREE_CODE (context) != FUNCTION_DECL)
4466 if (TREE_CODE (context) == RECORD_TYPE
4467 || TREE_CODE (context) == UNION_TYPE
4468 || TREE_CODE (context) == QUAL_UNION_TYPE)
4469 context = TYPE_CONTEXT (context);
4470 else if (TREE_CODE (context) == TYPE_DECL)
4471 context = DECL_CONTEXT (context);
4472 else if (TREE_CODE (context) == BLOCK)
4473 context = BLOCK_SUPERCONTEXT (context);
4475 /* Unhandled CONTEXT !? */
4482 /* Return the innermost context enclosing DECL that is
4483 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
4484 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
4487 decl_type_context (decl)
4490 tree context = DECL_CONTEXT (decl);
4494 if (TREE_CODE (context) == RECORD_TYPE
4495 || TREE_CODE (context) == UNION_TYPE
4496 || TREE_CODE (context) == QUAL_UNION_TYPE)
4498 if (TREE_CODE (context) == TYPE_DECL
4499 || TREE_CODE (context) == FUNCTION_DECL)
4500 context = DECL_CONTEXT (context);
4501 else if (TREE_CODE (context) == BLOCK)
4502 context = BLOCK_SUPERCONTEXT (context);
4504 /* Unhandled CONTEXT!? */
4510 /* Print debugging information about the size of the
4511 toplev_inline_obstacks. */
4514 print_inline_obstack_statistics ()
4516 struct simple_obstack_stack *current = toplev_inline_obstacks;
4518 unsigned long n_alloc = 0;
4521 for (; current; current = current->next, ++n_obstacks)
4523 struct obstack *o = current->obstack;
4524 struct _obstack_chunk *chunk = o->chunk;
4526 n_alloc += o->next_free - chunk->contents;
4527 chunk = chunk->prev;
4529 for (; chunk; chunk = chunk->prev, ++n_chunks)
4530 n_alloc += chunk->limit - &chunk->contents[0];
4532 fprintf (stderr, "inline obstacks: %d obstacks, %lu bytes, %d chunks\n",
4533 n_obstacks, n_alloc, n_chunks);
4536 /* Print debugging information about the obstack O, named STR. */
4539 print_obstack_statistics (str, o)
4543 struct _obstack_chunk *chunk = o->chunk;
4545 unsigned long n_alloc = 0;
4547 n_alloc += o->next_free - chunk->contents;
4548 chunk = chunk->prev;
4552 n_alloc += chunk->limit - &chunk->contents[0];
4553 chunk = chunk->prev;
4555 fprintf (stderr, "obstack %s: %lu bytes, %d chunks\n",
4556 str, n_alloc, n_chunks);
4559 /* Print debugging information about tree nodes generated during the compile,
4560 and any language-specific information. */
4563 dump_tree_statistics ()
4566 int total_nodes, total_bytes;
4568 fprintf (stderr, "\n??? tree nodes created\n\n");
4569 #ifdef GATHER_STATISTICS
4570 fprintf (stderr, "Kind Nodes Bytes\n");
4571 fprintf (stderr, "-------------------------------------\n");
4572 total_nodes = total_bytes = 0;
4573 for (i = 0; i < (int) all_kinds; i++)
4575 fprintf (stderr, "%-20s %6d %9d\n", tree_node_kind_names[i],
4576 tree_node_counts[i], tree_node_sizes[i]);
4577 total_nodes += tree_node_counts[i];
4578 total_bytes += tree_node_sizes[i];
4580 fprintf (stderr, "%-20s %9d\n", "identifier names", id_string_size);
4581 fprintf (stderr, "-------------------------------------\n");
4582 fprintf (stderr, "%-20s %6d %9d\n", "Total", total_nodes, total_bytes);
4583 fprintf (stderr, "-------------------------------------\n");
4585 fprintf (stderr, "(No per-node statistics)\n");
4587 print_obstack_statistics ("permanent_obstack", &permanent_obstack);
4588 print_obstack_statistics ("maybepermanent_obstack", &maybepermanent_obstack);
4589 print_obstack_statistics ("temporary_obstack", &temporary_obstack);
4590 print_obstack_statistics ("momentary_obstack", &momentary_obstack);
4591 print_obstack_statistics ("temp_decl_obstack", &temp_decl_obstack);
4592 print_inline_obstack_statistics ();
4593 print_lang_statistics ();
4596 #define FILE_FUNCTION_PREFIX_LEN 9
4598 #ifndef NO_DOLLAR_IN_LABEL
4599 #define FILE_FUNCTION_FORMAT "_GLOBAL_$D$%s"
4600 #else /* NO_DOLLAR_IN_LABEL */
4601 #ifndef NO_DOT_IN_LABEL
4602 #define FILE_FUNCTION_FORMAT "_GLOBAL_.D.%s"
4603 #else /* NO_DOT_IN_LABEL */
4604 #define FILE_FUNCTION_FORMAT "_GLOBAL__D_%s"
4605 #endif /* NO_DOT_IN_LABEL */
4606 #endif /* NO_DOLLAR_IN_LABEL */
4608 extern char * first_global_object_name;
4610 /* If KIND=='I', return a suitable global initializer (constructor) name.
4611 If KIND=='D', return a suitable global clean-up (destructor) name. */
4614 get_file_function_name (kind)
4620 if (first_global_object_name)
4621 p = first_global_object_name;
4622 else if (main_input_filename)
4623 p = main_input_filename;
4627 buf = (char *) alloca (sizeof (FILE_FUNCTION_FORMAT) + strlen (p));
4629 /* Set up the name of the file-level functions we may need. */
4630 /* Use a global object (which is already required to be unique over
4631 the program) rather than the file name (which imposes extra
4632 constraints). -- Raeburn@MIT.EDU, 10 Jan 1990. */
4633 sprintf (buf, FILE_FUNCTION_FORMAT, p);
4635 /* Don't need to pull weird characters out of global names. */
4636 if (p != first_global_object_name)
4638 for (p = buf+11; *p; p++)
4639 if (! ((*p >= '0' && *p <= '9')
4640 #if 0 /* we always want labels, which are valid C++ identifiers (+ `$') */
4641 #ifndef ASM_IDENTIFY_GCC /* this is required if `.' is invalid -- k. raeburn */
4645 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
4648 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
4651 || (*p >= 'A' && *p <= 'Z')
4652 || (*p >= 'a' && *p <= 'z')))
4656 buf[FILE_FUNCTION_PREFIX_LEN] = kind;
4658 return get_identifier (buf);
4661 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
4662 The result is placed in BUFFER (which has length BIT_SIZE),
4663 with one bit in each char ('\000' or '\001').
4665 If the constructor is constant, NULL_TREE is returned.
4666 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
4669 get_set_constructor_bits (init, buffer, bit_size)
4676 HOST_WIDE_INT domain_min
4677 = TREE_INT_CST_LOW (TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (init))));
4678 tree non_const_bits = NULL_TREE;
4679 for (i = 0; i < bit_size; i++)
4682 for (vals = TREE_OPERAND (init, 1);
4683 vals != NULL_TREE; vals = TREE_CHAIN (vals))
4685 if (TREE_CODE (TREE_VALUE (vals)) != INTEGER_CST
4686 || (TREE_PURPOSE (vals) != NULL_TREE
4687 && TREE_CODE (TREE_PURPOSE (vals)) != INTEGER_CST))
4689 = tree_cons (TREE_PURPOSE (vals), TREE_VALUE (vals), non_const_bits);
4690 else if (TREE_PURPOSE (vals) != NULL_TREE)
4692 /* Set a range of bits to ones. */
4693 HOST_WIDE_INT lo_index
4694 = TREE_INT_CST_LOW (TREE_PURPOSE (vals)) - domain_min;
4695 HOST_WIDE_INT hi_index
4696 = TREE_INT_CST_LOW (TREE_VALUE (vals)) - domain_min;
4697 if (lo_index < 0 || lo_index >= bit_size
4698 || hi_index < 0 || hi_index >= bit_size)
4700 for ( ; lo_index <= hi_index; lo_index++)
4701 buffer[lo_index] = 1;
4705 /* Set a single bit to one. */
4707 = TREE_INT_CST_LOW (TREE_VALUE (vals)) - domain_min;
4708 if (index < 0 || index >= bit_size)
4710 error ("invalid initializer for bit string");
4716 return non_const_bits;
4719 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
4720 The result is placed in BUFFER (which is an array of bytes).
4721 If the constructor is constant, NULL_TREE is returned.
4722 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
4725 get_set_constructor_bytes (init, buffer, wd_size)
4727 unsigned char *buffer;
4731 tree vals = TREE_OPERAND (init, 1);
4732 int set_word_size = BITS_PER_UNIT;
4733 int bit_size = wd_size * set_word_size;
4735 unsigned char *bytep = buffer;
4736 char *bit_buffer = (char *) alloca(bit_size);
4737 tree non_const_bits = get_set_constructor_bits (init, bit_buffer, bit_size);
4739 for (i = 0; i < wd_size; i++)
4742 for (i = 0; i < bit_size; i++)
4746 if (BYTES_BIG_ENDIAN)
4747 *bytep |= (1 << (set_word_size - 1 - bit_pos));
4749 *bytep |= 1 << bit_pos;
4752 if (bit_pos >= set_word_size)
4753 bit_pos = 0, bytep++;
4755 return non_const_bits;