1 /* Language-independent node constructors for parse phase of GNU compiler.
2 Copyright (C) 1987, 88, 92, 93, 94, 95, 1996 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. */
49 #define obstack_chunk_alloc xmalloc
50 #define obstack_chunk_free free
52 /* Tree nodes of permanent duration are allocated in this obstack.
53 They are the identifier nodes, and everything outside of
54 the bodies and parameters of function definitions. */
56 struct obstack permanent_obstack;
58 /* The initial RTL, and all ..._TYPE nodes, in a function
59 are allocated in this obstack. Usually they are freed at the
60 end of the function, but if the function is inline they are saved.
61 For top-level functions, this is maybepermanent_obstack.
62 Separate obstacks are made for nested functions. */
64 struct obstack *function_maybepermanent_obstack;
66 /* This is the function_maybepermanent_obstack for top-level functions. */
68 struct obstack maybepermanent_obstack;
70 /* This is a list of function_maybepermanent_obstacks for top-level inline
71 functions that are compiled in the middle of compiling other functions. */
73 struct simple_obstack_stack *toplev_inline_obstacks;
75 /* This is a list of function_maybepermanent_obstacks for inline functions
76 nested in the current function that were compiled in the middle of
77 compiling other functions. */
79 struct simple_obstack_stack *inline_obstacks;
81 /* The contents of the current function definition are allocated
82 in this obstack, and all are freed at the end of the function.
83 For top-level functions, this is temporary_obstack.
84 Separate obstacks are made for nested functions. */
86 struct obstack *function_obstack;
88 /* This is used for reading initializers of global variables. */
90 struct obstack temporary_obstack;
92 /* The tree nodes of an expression are allocated
93 in this obstack, and all are freed at the end of the expression. */
95 struct obstack momentary_obstack;
97 /* The tree nodes of a declarator are allocated
98 in this obstack, and all are freed when the declarator
101 static struct obstack temp_decl_obstack;
103 /* This points at either permanent_obstack
104 or the current function_maybepermanent_obstack. */
106 struct obstack *saveable_obstack;
108 /* This is same as saveable_obstack during parse and expansion phase;
109 it points to the current function's obstack during optimization.
110 This is the obstack to be used for creating rtl objects. */
112 struct obstack *rtl_obstack;
114 /* This points at either permanent_obstack or the current function_obstack. */
116 struct obstack *current_obstack;
118 /* This points at either permanent_obstack or the current function_obstack
119 or momentary_obstack. */
121 struct obstack *expression_obstack;
123 /* Stack of obstack selections for push_obstacks and pop_obstacks. */
127 struct obstack_stack *next;
128 struct obstack *current;
129 struct obstack *saveable;
130 struct obstack *expression;
134 struct obstack_stack *obstack_stack;
136 /* Obstack for allocating struct obstack_stack entries. */
138 static struct obstack obstack_stack_obstack;
140 /* Addresses of first objects in some obstacks.
141 This is for freeing their entire contents. */
142 char *maybepermanent_firstobj;
143 char *temporary_firstobj;
144 char *momentary_firstobj;
145 char *temp_decl_firstobj;
147 /* This is used to preserve objects (mainly array initializers) that need to
148 live until the end of the current function, but no further. */
149 char *momentary_function_firstobj;
151 /* Nonzero means all ..._TYPE nodes should be allocated permanently. */
153 int all_types_permanent;
155 /* Stack of places to restore the momentary obstack back to. */
157 struct momentary_level
159 /* Pointer back to previous such level. */
160 struct momentary_level *prev;
161 /* First object allocated within this level. */
163 /* Value of expression_obstack saved at entry to this level. */
164 struct obstack *obstack;
167 struct momentary_level *momentary_stack;
169 /* Table indexed by tree code giving a string containing a character
170 classifying the tree code. Possibilities are
171 t, d, s, c, r, <, 1, 2 and e. See tree.def for details. */
173 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
175 char *standard_tree_code_type[] = {
180 /* Table indexed by tree code giving number of expression
181 operands beyond the fixed part of the node structure.
182 Not used for types or decls. */
184 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
186 int standard_tree_code_length[] = {
191 /* Names of tree components.
192 Used for printing out the tree and error messages. */
193 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
195 char *standard_tree_code_name[] = {
200 /* Table indexed by tree code giving a string containing a character
201 classifying the tree code. Possibilities are
202 t, d, s, c, r, e, <, 1 and 2. See tree.def for details. */
204 char **tree_code_type;
206 /* Table indexed by tree code giving number of expression
207 operands beyond the fixed part of the node structure.
208 Not used for types or decls. */
210 int *tree_code_length;
212 /* Table indexed by tree code giving name of tree code, as a string. */
214 char **tree_code_name;
216 /* Statistics-gathering stuff. */
237 int tree_node_counts[(int)all_kinds];
238 int tree_node_sizes[(int)all_kinds];
239 int id_string_size = 0;
241 char *tree_node_kind_names[] = {
259 /* Hash table for uniquizing IDENTIFIER_NODEs by name. */
261 #define MAX_HASH_TABLE 1009
262 static tree hash_table[MAX_HASH_TABLE]; /* id hash buckets */
264 /* 0 while creating built-in identifiers. */
265 static int do_identifier_warnings;
267 /* Unique id for next decl created. */
268 static int next_decl_uid;
269 /* Unique id for next type created. */
270 static int next_type_uid = 1;
272 /* Here is how primitive or already-canonicalized types' hash
274 #define TYPE_HASH(TYPE) ((HOST_WIDE_INT) (TYPE) & 0777777)
276 extern char *mode_name[];
278 void gcc_obstack_init ();
280 /* Init the principal obstacks. */
285 gcc_obstack_init (&obstack_stack_obstack);
286 gcc_obstack_init (&permanent_obstack);
288 gcc_obstack_init (&temporary_obstack);
289 temporary_firstobj = (char *) obstack_alloc (&temporary_obstack, 0);
290 gcc_obstack_init (&momentary_obstack);
291 momentary_firstobj = (char *) obstack_alloc (&momentary_obstack, 0);
292 momentary_function_firstobj = momentary_firstobj;
293 gcc_obstack_init (&maybepermanent_obstack);
294 maybepermanent_firstobj
295 = (char *) obstack_alloc (&maybepermanent_obstack, 0);
296 gcc_obstack_init (&temp_decl_obstack);
297 temp_decl_firstobj = (char *) obstack_alloc (&temp_decl_obstack, 0);
299 function_obstack = &temporary_obstack;
300 function_maybepermanent_obstack = &maybepermanent_obstack;
301 current_obstack = &permanent_obstack;
302 expression_obstack = &permanent_obstack;
303 rtl_obstack = saveable_obstack = &permanent_obstack;
305 /* Init the hash table of identifiers. */
306 bzero ((char *) hash_table, sizeof hash_table);
310 gcc_obstack_init (obstack)
311 struct obstack *obstack;
313 /* Let particular systems override the size of a chunk. */
314 #ifndef OBSTACK_CHUNK_SIZE
315 #define OBSTACK_CHUNK_SIZE 0
317 /* Let them override the alloc and free routines too. */
318 #ifndef OBSTACK_CHUNK_ALLOC
319 #define OBSTACK_CHUNK_ALLOC xmalloc
321 #ifndef OBSTACK_CHUNK_FREE
322 #define OBSTACK_CHUNK_FREE free
324 _obstack_begin (obstack, OBSTACK_CHUNK_SIZE, 0,
325 (void *(*) ()) OBSTACK_CHUNK_ALLOC,
326 (void (*) ()) OBSTACK_CHUNK_FREE);
329 /* Save all variables describing the current status into the structure *P.
330 This is used before starting a nested function.
332 CONTEXT is the decl_function_context for the function we're about to
333 compile; if it isn't current_function_decl, we have to play some games. */
336 save_tree_status (p, context)
340 p->all_types_permanent = all_types_permanent;
341 p->momentary_stack = momentary_stack;
342 p->maybepermanent_firstobj = maybepermanent_firstobj;
343 p->temporary_firstobj = temporary_firstobj;
344 p->momentary_firstobj = momentary_firstobj;
345 p->momentary_function_firstobj = momentary_function_firstobj;
346 p->function_obstack = function_obstack;
347 p->function_maybepermanent_obstack = function_maybepermanent_obstack;
348 p->current_obstack = current_obstack;
349 p->expression_obstack = expression_obstack;
350 p->saveable_obstack = saveable_obstack;
351 p->rtl_obstack = rtl_obstack;
352 p->inline_obstacks = inline_obstacks;
354 if (context == current_function_decl)
355 /* Objects that need to be saved in this function can be in the nonsaved
356 obstack of the enclosing function since they can't possibly be needed
357 once it has returned. */
358 function_maybepermanent_obstack = function_obstack;
361 /* We're compiling a function which isn't nested in the current
362 function. We need to create a new maybepermanent_obstack for this
363 function, since it can't go onto any of the existing obstacks. */
364 struct simple_obstack_stack **head;
365 struct simple_obstack_stack *current;
367 if (context == NULL_TREE)
368 head = &toplev_inline_obstacks;
371 struct function *f = find_function_data (context);
372 head = &f->inline_obstacks;
375 current = ((struct simple_obstack_stack *)
376 xmalloc (sizeof (struct simple_obstack_stack)));
378 current->obstack = (struct obstack *) xmalloc (sizeof (struct obstack));
379 function_maybepermanent_obstack = current->obstack;
380 gcc_obstack_init (function_maybepermanent_obstack);
382 current->next = *head;
386 maybepermanent_firstobj
387 = (char *) obstack_finish (function_maybepermanent_obstack);
389 function_obstack = (struct obstack *) xmalloc (sizeof (struct obstack));
390 gcc_obstack_init (function_obstack);
392 current_obstack = &permanent_obstack;
393 expression_obstack = &permanent_obstack;
394 rtl_obstack = saveable_obstack = &permanent_obstack;
396 temporary_firstobj = (char *) obstack_alloc (&temporary_obstack, 0);
397 momentary_firstobj = (char *) obstack_finish (&momentary_obstack);
398 momentary_function_firstobj = momentary_firstobj;
401 /* Restore all variables describing the current status from the structure *P.
402 This is used after a nested function. */
405 restore_tree_status (p)
408 all_types_permanent = p->all_types_permanent;
409 momentary_stack = p->momentary_stack;
411 obstack_free (&momentary_obstack, momentary_function_firstobj);
413 /* Free saveable storage used by the function just compiled and not
416 CAUTION: This is in function_obstack of the containing function.
417 So we must be sure that we never allocate from that obstack during
418 the compilation of a nested function if we expect it to survive
419 past the nested function's end. */
420 obstack_free (function_maybepermanent_obstack, maybepermanent_firstobj);
422 obstack_free (function_obstack, 0);
423 free (function_obstack);
425 temporary_firstobj = p->temporary_firstobj;
426 momentary_firstobj = p->momentary_firstobj;
427 momentary_function_firstobj = p->momentary_function_firstobj;
428 maybepermanent_firstobj = p->maybepermanent_firstobj;
429 function_obstack = p->function_obstack;
430 function_maybepermanent_obstack = p->function_maybepermanent_obstack;
431 current_obstack = p->current_obstack;
432 expression_obstack = p->expression_obstack;
433 saveable_obstack = p->saveable_obstack;
434 rtl_obstack = p->rtl_obstack;
435 inline_obstacks = p->inline_obstacks;
438 /* Start allocating on the temporary (per function) obstack.
439 This is done in start_function before parsing the function body,
440 and before each initialization at top level, and to go back
441 to temporary allocation after doing permanent_allocation. */
444 temporary_allocation ()
446 /* Note that function_obstack at top level points to temporary_obstack.
447 But within a nested function context, it is a separate obstack. */
448 current_obstack = function_obstack;
449 expression_obstack = function_obstack;
450 rtl_obstack = saveable_obstack = function_maybepermanent_obstack;
455 /* Start allocating on the permanent obstack but don't
456 free the temporary data. After calling this, call
457 `permanent_allocation' to fully resume permanent allocation status. */
460 end_temporary_allocation ()
462 current_obstack = &permanent_obstack;
463 expression_obstack = &permanent_obstack;
464 rtl_obstack = saveable_obstack = &permanent_obstack;
467 /* Resume allocating on the temporary obstack, undoing
468 effects of `end_temporary_allocation'. */
471 resume_temporary_allocation ()
473 current_obstack = function_obstack;
474 expression_obstack = function_obstack;
475 rtl_obstack = saveable_obstack = function_maybepermanent_obstack;
478 /* While doing temporary allocation, switch to allocating in such a
479 way as to save all nodes if the function is inlined. Call
480 resume_temporary_allocation to go back to ordinary temporary
484 saveable_allocation ()
486 /* Note that function_obstack at top level points to temporary_obstack.
487 But within a nested function context, it is a separate obstack. */
488 expression_obstack = current_obstack = saveable_obstack;
491 /* Switch to current obstack CURRENT and maybepermanent obstack SAVEABLE,
492 recording the previously current obstacks on a stack.
493 This does not free any storage in any obstack. */
496 push_obstacks (current, saveable)
497 struct obstack *current, *saveable;
499 struct obstack_stack *p
500 = (struct obstack_stack *) obstack_alloc (&obstack_stack_obstack,
501 (sizeof (struct obstack_stack)));
503 p->current = current_obstack;
504 p->saveable = saveable_obstack;
505 p->expression = expression_obstack;
506 p->rtl = rtl_obstack;
507 p->next = obstack_stack;
510 current_obstack = current;
511 expression_obstack = current;
512 rtl_obstack = saveable_obstack = saveable;
515 /* Save the current set of obstacks, but don't change them. */
518 push_obstacks_nochange ()
520 struct obstack_stack *p
521 = (struct obstack_stack *) obstack_alloc (&obstack_stack_obstack,
522 (sizeof (struct obstack_stack)));
524 p->current = current_obstack;
525 p->saveable = saveable_obstack;
526 p->expression = expression_obstack;
527 p->rtl = rtl_obstack;
528 p->next = obstack_stack;
532 /* Pop the obstack selection stack. */
537 struct obstack_stack *p = obstack_stack;
538 obstack_stack = p->next;
540 current_obstack = p->current;
541 saveable_obstack = p->saveable;
542 expression_obstack = p->expression;
543 rtl_obstack = p->rtl;
545 obstack_free (&obstack_stack_obstack, p);
548 /* Nonzero if temporary allocation is currently in effect.
549 Zero if currently doing permanent allocation. */
552 allocation_temporary_p ()
554 return current_obstack != &permanent_obstack;
557 /* Go back to allocating on the permanent obstack
558 and free everything in the temporary obstack.
560 FUNCTION_END is true only if we have just finished compiling a function.
561 In that case, we also free preserved initial values on the momentary
565 permanent_allocation (function_end)
568 /* Free up previous temporary obstack data */
569 obstack_free (&temporary_obstack, temporary_firstobj);
572 obstack_free (&momentary_obstack, momentary_function_firstobj);
573 momentary_firstobj = momentary_function_firstobj;
576 obstack_free (&momentary_obstack, momentary_firstobj);
577 obstack_free (function_maybepermanent_obstack, maybepermanent_firstobj);
578 obstack_free (&temp_decl_obstack, temp_decl_firstobj);
580 /* Free up the maybepermanent_obstacks for any of our nested functions
581 which were compiled at a lower level. */
582 while (inline_obstacks)
584 struct simple_obstack_stack *current = inline_obstacks;
585 inline_obstacks = current->next;
586 obstack_free (current->obstack, 0);
587 free (current->obstack);
591 current_obstack = &permanent_obstack;
592 expression_obstack = &permanent_obstack;
593 rtl_obstack = saveable_obstack = &permanent_obstack;
596 /* Save permanently everything on the maybepermanent_obstack. */
601 maybepermanent_firstobj
602 = (char *) obstack_alloc (function_maybepermanent_obstack, 0);
606 preserve_initializer ()
608 struct momentary_level *tem;
612 = (char *) obstack_alloc (&temporary_obstack, 0);
613 maybepermanent_firstobj
614 = (char *) obstack_alloc (function_maybepermanent_obstack, 0);
616 old_momentary = momentary_firstobj;
618 = (char *) obstack_alloc (&momentary_obstack, 0);
619 if (momentary_firstobj != old_momentary)
620 for (tem = momentary_stack; tem; tem = tem->prev)
621 tem->base = momentary_firstobj;
624 /* Start allocating new rtl in current_obstack.
625 Use resume_temporary_allocation
626 to go back to allocating rtl in saveable_obstack. */
629 rtl_in_current_obstack ()
631 rtl_obstack = current_obstack;
634 /* Start allocating rtl from saveable_obstack. Intended to be used after
635 a call to push_obstacks_nochange. */
638 rtl_in_saveable_obstack ()
640 rtl_obstack = saveable_obstack;
643 /* Allocate SIZE bytes in the current obstack
644 and return a pointer to them.
645 In practice the current obstack is always the temporary one. */
651 return (char *) obstack_alloc (current_obstack, size);
654 /* Free the object PTR in the current obstack
655 as well as everything allocated since PTR.
656 In practice the current obstack is always the temporary one. */
662 obstack_free (current_obstack, ptr);
665 /* Allocate SIZE bytes in the permanent obstack
666 and return a pointer to them. */
672 return (char *) obstack_alloc (&permanent_obstack, size);
675 /* Allocate NELEM items of SIZE bytes in the permanent obstack
676 and return a pointer to them. The storage is cleared before
677 returning the value. */
680 perm_calloc (nelem, size)
684 char *rval = (char *) obstack_alloc (&permanent_obstack, nelem * size);
685 bzero (rval, nelem * size);
689 /* Allocate SIZE bytes in the saveable obstack
690 and return a pointer to them. */
696 return (char *) obstack_alloc (saveable_obstack, size);
699 /* Print out which obstack an object is in. */
702 print_obstack_name (object, file, prefix)
707 struct obstack *obstack = NULL;
708 char *obstack_name = NULL;
711 for (p = outer_function_chain; p; p = p->next)
713 if (_obstack_allocated_p (p->function_obstack, object))
715 obstack = p->function_obstack;
716 obstack_name = "containing function obstack";
718 if (_obstack_allocated_p (p->function_maybepermanent_obstack, object))
720 obstack = p->function_maybepermanent_obstack;
721 obstack_name = "containing function maybepermanent obstack";
725 if (_obstack_allocated_p (&obstack_stack_obstack, object))
727 obstack = &obstack_stack_obstack;
728 obstack_name = "obstack_stack_obstack";
730 else if (_obstack_allocated_p (function_obstack, object))
732 obstack = function_obstack;
733 obstack_name = "function obstack";
735 else if (_obstack_allocated_p (&permanent_obstack, object))
737 obstack = &permanent_obstack;
738 obstack_name = "permanent_obstack";
740 else if (_obstack_allocated_p (&momentary_obstack, object))
742 obstack = &momentary_obstack;
743 obstack_name = "momentary_obstack";
745 else if (_obstack_allocated_p (function_maybepermanent_obstack, object))
747 obstack = function_maybepermanent_obstack;
748 obstack_name = "function maybepermanent obstack";
750 else if (_obstack_allocated_p (&temp_decl_obstack, object))
752 obstack = &temp_decl_obstack;
753 obstack_name = "temp_decl_obstack";
756 /* Check to see if the object is in the free area of the obstack. */
759 if (object >= obstack->next_free
760 && object < obstack->chunk_limit)
761 fprintf (file, "%s in free portion of obstack %s",
762 prefix, obstack_name);
764 fprintf (file, "%s allocated from %s", prefix, obstack_name);
767 fprintf (file, "%s not allocated from any obstack", prefix);
771 debug_obstack (object)
774 print_obstack_name (object, stderr, "object");
775 fprintf (stderr, ".\n");
778 /* Return 1 if OBJ is in the permanent obstack.
779 This is slow, and should be used only for debugging.
780 Use TREE_PERMANENT for other purposes. */
783 object_permanent_p (obj)
786 return _obstack_allocated_p (&permanent_obstack, obj);
789 /* Start a level of momentary allocation.
790 In C, each compound statement has its own level
791 and that level is freed at the end of each statement.
792 All expression nodes are allocated in the momentary allocation level. */
797 struct momentary_level *tem
798 = (struct momentary_level *) obstack_alloc (&momentary_obstack,
799 sizeof (struct momentary_level));
800 tem->prev = momentary_stack;
801 tem->base = (char *) obstack_base (&momentary_obstack);
802 tem->obstack = expression_obstack;
803 momentary_stack = tem;
804 expression_obstack = &momentary_obstack;
807 /* Set things up so the next clear_momentary will only clear memory
808 past our present position in momentary_obstack. */
811 preserve_momentary ()
813 momentary_stack->base = (char *) obstack_base (&momentary_obstack);
816 /* Free all the storage in the current momentary-allocation level.
817 In C, this happens at the end of each statement. */
822 obstack_free (&momentary_obstack, momentary_stack->base);
825 /* Discard a level of momentary allocation.
826 In C, this happens at the end of each compound statement.
827 Restore the status of expression node allocation
828 that was in effect before this level was created. */
833 struct momentary_level *tem = momentary_stack;
834 momentary_stack = tem->prev;
835 expression_obstack = tem->obstack;
836 /* We can't free TEM from the momentary_obstack, because there might
837 be objects above it which have been saved. We can free back to the
838 stack of the level we are popping off though. */
839 obstack_free (&momentary_obstack, tem->base);
842 /* Pop back to the previous level of momentary allocation,
843 but don't free any momentary data just yet. */
846 pop_momentary_nofree ()
848 struct momentary_level *tem = momentary_stack;
849 momentary_stack = tem->prev;
850 expression_obstack = tem->obstack;
853 /* Call when starting to parse a declaration:
854 make expressions in the declaration last the length of the function.
855 Returns an argument that should be passed to resume_momentary later. */
860 register int tem = expression_obstack == &momentary_obstack;
861 expression_obstack = saveable_obstack;
865 /* Call when finished parsing a declaration:
866 restore the treatment of node-allocation that was
867 in effect before the suspension.
868 YES should be the value previously returned by suspend_momentary. */
871 resume_momentary (yes)
875 expression_obstack = &momentary_obstack;
878 /* Init the tables indexed by tree code.
879 Note that languages can add to these tables to define their own codes. */
884 tree_code_type = (char **) xmalloc (sizeof (standard_tree_code_type));
885 tree_code_length = (int *) xmalloc (sizeof (standard_tree_code_length));
886 tree_code_name = (char **) xmalloc (sizeof (standard_tree_code_name));
887 bcopy ((char *) standard_tree_code_type, (char *) tree_code_type,
888 sizeof (standard_tree_code_type));
889 bcopy ((char *) standard_tree_code_length, (char *) tree_code_length,
890 sizeof (standard_tree_code_length));
891 bcopy ((char *) standard_tree_code_name, (char *) tree_code_name,
892 sizeof (standard_tree_code_name));
895 /* Return a newly allocated node of code CODE.
896 Initialize the node's unique id and its TREE_PERMANENT flag.
897 For decl and type nodes, some other fields are initialized.
898 The rest of the node is initialized to zero.
900 Achoo! I got a code in the node. */
907 register int type = TREE_CODE_CLASS (code);
909 register struct obstack *obstack = current_obstack;
911 register tree_node_kind kind;
915 case 'd': /* A decl node */
916 #ifdef GATHER_STATISTICS
919 length = sizeof (struct tree_decl);
920 /* All decls in an inline function need to be saved. */
921 if (obstack != &permanent_obstack)
922 obstack = saveable_obstack;
924 /* PARM_DECLs go on the context of the parent. If this is a nested
925 function, then we must allocate the PARM_DECL on the parent's
926 obstack, so that they will live to the end of the parent's
927 closing brace. This is necessary in case we try to inline the
928 function into its parent.
930 PARM_DECLs of top-level functions do not have this problem. However,
931 we allocate them where we put the FUNCTION_DECL for languages such as
932 Ada that need to consult some flags in the PARM_DECLs of the function
935 See comment in restore_tree_status for why we can't put this
936 in function_obstack. */
937 if (code == PARM_DECL && obstack != &permanent_obstack)
940 if (current_function_decl)
941 context = decl_function_context (current_function_decl);
945 = find_function_data (context)->function_maybepermanent_obstack;
949 case 't': /* a type node */
950 #ifdef GATHER_STATISTICS
953 length = sizeof (struct tree_type);
954 /* All data types are put where we can preserve them if nec. */
955 if (obstack != &permanent_obstack)
956 obstack = all_types_permanent ? &permanent_obstack : saveable_obstack;
959 case 'b': /* a lexical block */
960 #ifdef GATHER_STATISTICS
963 length = sizeof (struct tree_block);
964 /* All BLOCK nodes are put where we can preserve them if nec. */
965 if (obstack != &permanent_obstack)
966 obstack = saveable_obstack;
969 case 's': /* an expression with side effects */
970 #ifdef GATHER_STATISTICS
974 case 'r': /* a reference */
975 #ifdef GATHER_STATISTICS
979 case 'e': /* an expression */
980 case '<': /* a comparison expression */
981 case '1': /* a unary arithmetic expression */
982 case '2': /* a binary arithmetic expression */
983 #ifdef GATHER_STATISTICS
987 obstack = expression_obstack;
988 /* All BIND_EXPR nodes are put where we can preserve them if nec. */
989 if (code == BIND_EXPR && obstack != &permanent_obstack)
990 obstack = saveable_obstack;
991 length = sizeof (struct tree_exp)
992 + (tree_code_length[(int) code] - 1) * sizeof (char *);
995 case 'c': /* a constant */
996 #ifdef GATHER_STATISTICS
999 obstack = expression_obstack;
1001 /* We can't use tree_code_length for INTEGER_CST, since the number of
1002 words is machine-dependent due to varying length of HOST_WIDE_INT,
1003 which might be wider than a pointer (e.g., long long). Similarly
1004 for REAL_CST, since the number of words is machine-dependent due
1005 to varying size and alignment of `double'. */
1007 if (code == INTEGER_CST)
1008 length = sizeof (struct tree_int_cst);
1009 else if (code == REAL_CST)
1010 length = sizeof (struct tree_real_cst);
1012 length = sizeof (struct tree_common)
1013 + tree_code_length[(int) code] * sizeof (char *);
1016 case 'x': /* something random, like an identifier. */
1017 #ifdef GATHER_STATISTICS
1018 if (code == IDENTIFIER_NODE)
1020 else if (code == OP_IDENTIFIER)
1022 else if (code == TREE_VEC)
1027 length = sizeof (struct tree_common)
1028 + tree_code_length[(int) code] * sizeof (char *);
1029 /* Identifier nodes are always permanent since they are
1030 unique in a compiler run. */
1031 if (code == IDENTIFIER_NODE) obstack = &permanent_obstack;
1038 t = (tree) obstack_alloc (obstack, length);
1040 #ifdef GATHER_STATISTICS
1041 tree_node_counts[(int)kind]++;
1042 tree_node_sizes[(int)kind] += length;
1045 /* Clear a word at a time. */
1046 for (i = (length / sizeof (int)) - 1; i >= 0; i--)
1048 /* Clear any extra bytes. */
1049 for (i = length / sizeof (int) * sizeof (int); i < length; i++)
1050 ((char *) t)[i] = 0;
1052 TREE_SET_CODE (t, code);
1053 if (obstack == &permanent_obstack)
1054 TREE_PERMANENT (t) = 1;
1059 TREE_SIDE_EFFECTS (t) = 1;
1060 TREE_TYPE (t) = void_type_node;
1064 if (code != FUNCTION_DECL)
1066 DECL_IN_SYSTEM_HEADER (t)
1067 = in_system_header && (obstack == &permanent_obstack);
1068 DECL_SOURCE_LINE (t) = lineno;
1069 DECL_SOURCE_FILE (t) = (input_filename) ? input_filename : "<built-in>";
1070 DECL_UID (t) = next_decl_uid++;
1074 TYPE_UID (t) = next_type_uid++;
1076 TYPE_MAIN_VARIANT (t) = t;
1077 TYPE_OBSTACK (t) = obstack;
1078 TYPE_ATTRIBUTES (t) = NULL_TREE;
1079 #ifdef SET_DEFAULT_TYPE_ATTRIBUTES
1080 SET_DEFAULT_TYPE_ATTRIBUTES (t);
1085 TREE_CONSTANT (t) = 1;
1092 /* Return a new node with the same contents as NODE
1093 except that its TREE_CHAIN is zero and it has a fresh uid. */
1100 register enum tree_code code = TREE_CODE (node);
1101 register int length;
1104 switch (TREE_CODE_CLASS (code))
1106 case 'd': /* A decl node */
1107 length = sizeof (struct tree_decl);
1110 case 't': /* a type node */
1111 length = sizeof (struct tree_type);
1114 case 'b': /* a lexical block node */
1115 length = sizeof (struct tree_block);
1118 case 'r': /* a reference */
1119 case 'e': /* an expression */
1120 case 's': /* an expression with side effects */
1121 case '<': /* a comparison expression */
1122 case '1': /* a unary arithmetic expression */
1123 case '2': /* a binary arithmetic expression */
1124 length = sizeof (struct tree_exp)
1125 + (tree_code_length[(int) code] - 1) * sizeof (char *);
1128 case 'c': /* a constant */
1129 /* We can't use tree_code_length for INTEGER_CST, since the number of
1130 words is machine-dependent due to varying length of HOST_WIDE_INT,
1131 which might be wider than a pointer (e.g., long long). Similarly
1132 for REAL_CST, since the number of words is machine-dependent due
1133 to varying size and alignment of `double'. */
1134 if (code == INTEGER_CST)
1136 length = sizeof (struct tree_int_cst);
1139 else if (code == REAL_CST)
1141 length = sizeof (struct tree_real_cst);
1145 case 'x': /* something random, like an identifier. */
1146 length = sizeof (struct tree_common)
1147 + tree_code_length[(int) code] * sizeof (char *);
1148 if (code == TREE_VEC)
1149 length += (TREE_VEC_LENGTH (node) - 1) * sizeof (char *);
1152 t = (tree) obstack_alloc (current_obstack, length);
1154 for (i = (length / sizeof (int)) - 1; i >= 0; i--)
1155 ((int *) t)[i] = ((int *) node)[i];
1156 /* Clear any extra bytes. */
1157 for (i = length / sizeof (int) * sizeof (int); i < length; i++)
1158 ((char *) t)[i] = ((char *) node)[i];
1162 if (TREE_CODE_CLASS (code) == 'd')
1163 DECL_UID (t) = next_decl_uid++;
1164 else if (TREE_CODE_CLASS (code) == 't')
1166 TYPE_UID (t) = next_type_uid++;
1167 TYPE_OBSTACK (t) = current_obstack;
1169 /* The following is so that the debug code for
1170 the copy is different from the original type.
1171 The two statements usually duplicate each other
1172 (because they clear fields of the same union),
1173 but the optimizer should catch that. */
1174 TYPE_SYMTAB_POINTER (t) = 0;
1175 TYPE_SYMTAB_ADDRESS (t) = 0;
1178 TREE_PERMANENT (t) = (current_obstack == &permanent_obstack);
1183 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
1184 For example, this can copy a list made of TREE_LIST nodes. */
1191 register tree prev, next;
1196 head = prev = copy_node (list);
1197 next = TREE_CHAIN (list);
1200 TREE_CHAIN (prev) = copy_node (next);
1201 prev = TREE_CHAIN (prev);
1202 next = TREE_CHAIN (next);
1209 /* Return an IDENTIFIER_NODE whose name is TEXT (a null-terminated string).
1210 If an identifier with that name has previously been referred to,
1211 the same node is returned this time. */
1214 get_identifier (text)
1215 register char *text;
1220 register int len, hash_len;
1222 /* Compute length of text in len. */
1223 for (len = 0; text[len]; len++);
1225 /* Decide how much of that length to hash on */
1227 if (warn_id_clash && len > id_clash_len)
1228 hash_len = id_clash_len;
1230 /* Compute hash code */
1231 hi = hash_len * 613 + (unsigned)text[0];
1232 for (i = 1; i < hash_len; i += 2)
1233 hi = ((hi * 613) + (unsigned)(text[i]));
1235 hi &= (1 << HASHBITS) - 1;
1236 hi %= MAX_HASH_TABLE;
1238 /* Search table for identifier */
1239 for (idp = hash_table[hi]; idp; idp = TREE_CHAIN (idp))
1240 if (IDENTIFIER_LENGTH (idp) == len
1241 && IDENTIFIER_POINTER (idp)[0] == text[0]
1242 && !bcmp (IDENTIFIER_POINTER (idp), text, len))
1243 return idp; /* <-- return if found */
1245 /* Not found; optionally warn about a similar identifier */
1246 if (warn_id_clash && do_identifier_warnings && len >= id_clash_len)
1247 for (idp = hash_table[hi]; idp; idp = TREE_CHAIN (idp))
1248 if (!strncmp (IDENTIFIER_POINTER (idp), text, id_clash_len))
1250 warning ("`%s' and `%s' identical in first %d characters",
1251 IDENTIFIER_POINTER (idp), text, id_clash_len);
1255 if (tree_code_length[(int) IDENTIFIER_NODE] < 0)
1256 abort (); /* set_identifier_size hasn't been called. */
1258 /* Not found, create one, add to chain */
1259 idp = make_node (IDENTIFIER_NODE);
1260 IDENTIFIER_LENGTH (idp) = len;
1261 #ifdef GATHER_STATISTICS
1262 id_string_size += len;
1265 IDENTIFIER_POINTER (idp) = obstack_copy0 (&permanent_obstack, text, len);
1267 TREE_CHAIN (idp) = hash_table[hi];
1268 hash_table[hi] = idp;
1269 return idp; /* <-- return if created */
1272 /* Enable warnings on similar identifiers (if requested).
1273 Done after the built-in identifiers are created. */
1276 start_identifier_warnings ()
1278 do_identifier_warnings = 1;
1281 /* Record the size of an identifier node for the language in use.
1282 SIZE is the total size in bytes.
1283 This is called by the language-specific files. This must be
1284 called before allocating any identifiers. */
1287 set_identifier_size (size)
1290 tree_code_length[(int) IDENTIFIER_NODE]
1291 = (size - sizeof (struct tree_common)) / sizeof (tree);
1294 /* Return a newly constructed INTEGER_CST node whose constant value
1295 is specified by the two ints LOW and HI.
1296 The TREE_TYPE is set to `int'.
1298 This function should be used via the `build_int_2' macro. */
1301 build_int_2_wide (low, hi)
1302 HOST_WIDE_INT low, hi;
1304 register tree t = make_node (INTEGER_CST);
1305 TREE_INT_CST_LOW (t) = low;
1306 TREE_INT_CST_HIGH (t) = hi;
1307 TREE_TYPE (t) = integer_type_node;
1311 /* Return a new REAL_CST node whose type is TYPE and value is D. */
1314 build_real (type, d)
1321 /* Check for valid float value for this type on this target machine;
1322 if not, can print error message and store a valid value in D. */
1323 #ifdef CHECK_FLOAT_VALUE
1324 CHECK_FLOAT_VALUE (TYPE_MODE (type), d, overflow);
1327 v = make_node (REAL_CST);
1328 TREE_TYPE (v) = type;
1329 TREE_REAL_CST (v) = d;
1330 TREE_OVERFLOW (v) = TREE_CONSTANT_OVERFLOW (v) = overflow;
1334 /* Return a new REAL_CST node whose type is TYPE
1335 and whose value is the integer value of the INTEGER_CST node I. */
1337 #if !defined (REAL_IS_NOT_DOUBLE) || defined (REAL_ARITHMETIC)
1340 real_value_from_int_cst (type, i)
1345 /* Some 386 compilers mishandle unsigned int to float conversions,
1346 so introduce a temporary variable E to avoid those bugs. */
1348 #ifdef REAL_ARITHMETIC
1349 if (! TREE_UNSIGNED (TREE_TYPE (i)))
1350 REAL_VALUE_FROM_INT (d, TREE_INT_CST_LOW (i), TREE_INT_CST_HIGH (i),
1353 REAL_VALUE_FROM_UNSIGNED_INT (d, TREE_INT_CST_LOW (i),
1354 TREE_INT_CST_HIGH (i), TYPE_MODE (type));
1355 #else /* not REAL_ARITHMETIC */
1356 if (TREE_INT_CST_HIGH (i) < 0 && ! TREE_UNSIGNED (TREE_TYPE (i)))
1358 d = (double) (~ TREE_INT_CST_HIGH (i));
1359 e = ((double) ((HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT / 2))
1360 * (double) ((HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT / 2)));
1362 e = (double) (unsigned HOST_WIDE_INT) (~ TREE_INT_CST_LOW (i));
1368 d = (double) (unsigned HOST_WIDE_INT) TREE_INT_CST_HIGH (i);
1369 e = ((double) ((HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT / 2))
1370 * (double) ((HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT / 2)));
1372 e = (double) (unsigned HOST_WIDE_INT) TREE_INT_CST_LOW (i);
1375 #endif /* not REAL_ARITHMETIC */
1379 /* This function can't be implemented if we can't do arithmetic
1380 on the float representation. */
1383 build_real_from_int_cst (type, i)
1388 int overflow = TREE_OVERFLOW (i);
1390 jmp_buf float_error;
1392 v = make_node (REAL_CST);
1393 TREE_TYPE (v) = type;
1395 if (setjmp (float_error))
1402 set_float_handler (float_error);
1404 #ifdef REAL_ARITHMETIC
1405 d = real_value_from_int_cst (type, i);
1407 d = REAL_VALUE_TRUNCATE (TYPE_MODE (type),
1408 real_value_from_int_cst (type, i));
1411 /* Check for valid float value for this type on this target machine. */
1414 set_float_handler (NULL_PTR);
1416 #ifdef CHECK_FLOAT_VALUE
1417 CHECK_FLOAT_VALUE (TYPE_MODE (type), d, overflow);
1420 TREE_REAL_CST (v) = d;
1421 TREE_OVERFLOW (v) = TREE_CONSTANT_OVERFLOW (v) = overflow;
1425 #endif /* not REAL_IS_NOT_DOUBLE, or REAL_ARITHMETIC */
1427 /* Return a newly constructed STRING_CST node whose value is
1428 the LEN characters at STR.
1429 The TREE_TYPE is not initialized. */
1432 build_string (len, str)
1436 /* Put the string in saveable_obstack since it will be placed in the RTL
1437 for an "asm" statement and will also be kept around a while if
1438 deferring constant output in varasm.c. */
1440 register tree s = make_node (STRING_CST);
1441 TREE_STRING_LENGTH (s) = len;
1442 TREE_STRING_POINTER (s) = obstack_copy0 (saveable_obstack, str, len);
1446 /* Return a newly constructed COMPLEX_CST node whose value is
1447 specified by the real and imaginary parts REAL and IMAG.
1448 Both REAL and IMAG should be constant nodes.
1449 The TREE_TYPE is not initialized. */
1452 build_complex (real, imag)
1455 register tree t = make_node (COMPLEX_CST);
1457 TREE_REALPART (t) = real;
1458 TREE_IMAGPART (t) = imag;
1459 TREE_TYPE (t) = build_complex_type (TREE_TYPE (real));
1460 TREE_OVERFLOW (t) = TREE_OVERFLOW (real) | TREE_OVERFLOW (imag);
1461 TREE_CONSTANT_OVERFLOW (t)
1462 = TREE_CONSTANT_OVERFLOW (real) | TREE_CONSTANT_OVERFLOW (imag);
1466 /* Build a newly constructed TREE_VEC node of length LEN. */
1472 register int length = (len-1) * sizeof (tree) + sizeof (struct tree_vec);
1473 register struct obstack *obstack = current_obstack;
1476 #ifdef GATHER_STATISTICS
1477 tree_node_counts[(int)vec_kind]++;
1478 tree_node_sizes[(int)vec_kind] += length;
1481 t = (tree) obstack_alloc (obstack, length);
1483 for (i = (length / sizeof (int)) - 1; i >= 0; i--)
1486 TREE_SET_CODE (t, TREE_VEC);
1487 TREE_VEC_LENGTH (t) = len;
1488 if (obstack == &permanent_obstack)
1489 TREE_PERMANENT (t) = 1;
1494 /* Return 1 if EXPR is the integer constant zero or a complex constant
1498 integer_zerop (expr)
1503 return ((TREE_CODE (expr) == INTEGER_CST
1504 && TREE_INT_CST_LOW (expr) == 0
1505 && TREE_INT_CST_HIGH (expr) == 0)
1506 || (TREE_CODE (expr) == COMPLEX_CST
1507 && integer_zerop (TREE_REALPART (expr))
1508 && integer_zerop (TREE_IMAGPART (expr))));
1511 /* Return 1 if EXPR is the integer constant one or the corresponding
1512 complex constant. */
1520 return ((TREE_CODE (expr) == INTEGER_CST
1521 && TREE_INT_CST_LOW (expr) == 1
1522 && TREE_INT_CST_HIGH (expr) == 0)
1523 || (TREE_CODE (expr) == COMPLEX_CST
1524 && integer_onep (TREE_REALPART (expr))
1525 && integer_zerop (TREE_IMAGPART (expr))));
1528 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
1529 it contains. Likewise for the corresponding complex constant. */
1532 integer_all_onesp (expr)
1540 if (TREE_CODE (expr) == COMPLEX_CST
1541 && integer_all_onesp (TREE_REALPART (expr))
1542 && integer_zerop (TREE_IMAGPART (expr)))
1545 else if (TREE_CODE (expr) != INTEGER_CST)
1548 uns = TREE_UNSIGNED (TREE_TYPE (expr));
1550 return TREE_INT_CST_LOW (expr) == -1 && TREE_INT_CST_HIGH (expr) == -1;
1552 /* Note that using TYPE_PRECISION here is wrong. We care about the
1553 actual bits, not the (arbitrary) range of the type. */
1554 prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr)));
1555 if (prec >= HOST_BITS_PER_WIDE_INT)
1557 int high_value, shift_amount;
1559 shift_amount = prec - HOST_BITS_PER_WIDE_INT;
1561 if (shift_amount > HOST_BITS_PER_WIDE_INT)
1562 /* Can not handle precisions greater than twice the host int size. */
1564 else if (shift_amount == HOST_BITS_PER_WIDE_INT)
1565 /* Shifting by the host word size is undefined according to the ANSI
1566 standard, so we must handle this as a special case. */
1569 high_value = ((HOST_WIDE_INT) 1 << shift_amount) - 1;
1571 return TREE_INT_CST_LOW (expr) == -1
1572 && TREE_INT_CST_HIGH (expr) == high_value;
1575 return TREE_INT_CST_LOW (expr) == ((HOST_WIDE_INT) 1 << prec) - 1;
1578 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
1582 integer_pow2p (expr)
1585 HOST_WIDE_INT high, low;
1589 if (TREE_CODE (expr) == COMPLEX_CST
1590 && integer_pow2p (TREE_REALPART (expr))
1591 && integer_zerop (TREE_IMAGPART (expr)))
1594 if (TREE_CODE (expr) != INTEGER_CST)
1597 high = TREE_INT_CST_HIGH (expr);
1598 low = TREE_INT_CST_LOW (expr);
1600 if (high == 0 && low == 0)
1603 return ((high == 0 && (low & (low - 1)) == 0)
1604 || (low == 0 && (high & (high - 1)) == 0));
1607 /* Return 1 if EXPR is the real constant zero. */
1615 return ((TREE_CODE (expr) == REAL_CST
1616 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst0))
1617 || (TREE_CODE (expr) == COMPLEX_CST
1618 && real_zerop (TREE_REALPART (expr))
1619 && real_zerop (TREE_IMAGPART (expr))));
1622 /* Return 1 if EXPR is the real constant one in real or complex form. */
1630 return ((TREE_CODE (expr) == REAL_CST
1631 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst1))
1632 || (TREE_CODE (expr) == COMPLEX_CST
1633 && real_onep (TREE_REALPART (expr))
1634 && real_zerop (TREE_IMAGPART (expr))));
1637 /* Return 1 if EXPR is the real constant two. */
1645 return ((TREE_CODE (expr) == REAL_CST
1646 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst2))
1647 || (TREE_CODE (expr) == COMPLEX_CST
1648 && real_twop (TREE_REALPART (expr))
1649 && real_zerop (TREE_IMAGPART (expr))));
1652 /* Nonzero if EXP is a constant or a cast of a constant. */
1655 really_constant_p (exp)
1658 /* This is not quite the same as STRIP_NOPS. It does more. */
1659 while (TREE_CODE (exp) == NOP_EXPR
1660 || TREE_CODE (exp) == CONVERT_EXPR
1661 || TREE_CODE (exp) == NON_LVALUE_EXPR)
1662 exp = TREE_OPERAND (exp, 0);
1663 return TREE_CONSTANT (exp);
1666 /* Return first list element whose TREE_VALUE is ELEM.
1667 Return 0 if ELEM is not in LIST. */
1670 value_member (elem, list)
1675 if (elem == TREE_VALUE (list))
1677 list = TREE_CHAIN (list);
1682 /* Return first list element whose TREE_PURPOSE is ELEM.
1683 Return 0 if ELEM is not in LIST. */
1686 purpose_member (elem, list)
1691 if (elem == TREE_PURPOSE (list))
1693 list = TREE_CHAIN (list);
1698 /* Return first list element whose BINFO_TYPE is ELEM.
1699 Return 0 if ELEM is not in LIST. */
1702 binfo_member (elem, list)
1707 if (elem == BINFO_TYPE (list))
1709 list = TREE_CHAIN (list);
1714 /* Return nonzero if ELEM is part of the chain CHAIN. */
1717 chain_member (elem, chain)
1724 chain = TREE_CHAIN (chain);
1730 /* Return nonzero if ELEM is equal to TREE_VALUE (CHAIN) for any piece of
1732 /* ??? This function was added for machine specific attributes but is no
1733 longer used. It could be deleted if we could confirm all front ends
1737 chain_member_value (elem, chain)
1742 if (elem == TREE_VALUE (chain))
1744 chain = TREE_CHAIN (chain);
1750 /* Return nonzero if ELEM is equal to TREE_PURPOSE (CHAIN)
1751 for any piece of chain CHAIN. */
1752 /* ??? This function was added for machine specific attributes but is no
1753 longer used. It could be deleted if we could confirm all front ends
1757 chain_member_purpose (elem, chain)
1762 if (elem == TREE_PURPOSE (chain))
1764 chain = TREE_CHAIN (chain);
1770 /* Return the length of a chain of nodes chained through TREE_CHAIN.
1771 We expect a null pointer to mark the end of the chain.
1772 This is the Lisp primitive `length'. */
1779 register int len = 0;
1781 for (tail = t; tail; tail = TREE_CHAIN (tail))
1787 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
1788 by modifying the last node in chain 1 to point to chain 2.
1789 This is the Lisp primitive `nconc'. */
1801 for (t1 = op1; TREE_CHAIN (t1); t1 = TREE_CHAIN (t1))
1803 TREE_CHAIN (t1) = op2;
1804 for (t2 = op2; t2; t2 = TREE_CHAIN (t2))
1806 abort (); /* Circularity created. */
1812 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
1816 register tree chain;
1820 while (next = TREE_CHAIN (chain))
1825 /* Reverse the order of elements in the chain T,
1826 and return the new head of the chain (old last element). */
1832 register tree prev = 0, decl, next;
1833 for (decl = t; decl; decl = next)
1835 next = TREE_CHAIN (decl);
1836 TREE_CHAIN (decl) = prev;
1842 /* Given a chain CHAIN of tree nodes,
1843 construct and return a list of those nodes. */
1849 tree result = NULL_TREE;
1850 tree in_tail = chain;
1851 tree out_tail = NULL_TREE;
1855 tree next = tree_cons (NULL_TREE, in_tail, NULL_TREE);
1857 TREE_CHAIN (out_tail) = next;
1861 in_tail = TREE_CHAIN (in_tail);
1867 /* Return a newly created TREE_LIST node whose
1868 purpose and value fields are PARM and VALUE. */
1871 build_tree_list (parm, value)
1874 register tree t = make_node (TREE_LIST);
1875 TREE_PURPOSE (t) = parm;
1876 TREE_VALUE (t) = value;
1880 /* Similar, but build on the temp_decl_obstack. */
1883 build_decl_list (parm, value)
1887 register struct obstack *ambient_obstack = current_obstack;
1888 current_obstack = &temp_decl_obstack;
1889 node = build_tree_list (parm, value);
1890 current_obstack = ambient_obstack;
1894 /* Return a newly created TREE_LIST node whose
1895 purpose and value fields are PARM and VALUE
1896 and whose TREE_CHAIN is CHAIN. */
1899 tree_cons (purpose, value, chain)
1900 tree purpose, value, chain;
1903 register tree node = make_node (TREE_LIST);
1906 register tree node = (tree) obstack_alloc (current_obstack, sizeof (struct tree_list));
1907 #ifdef GATHER_STATISTICS
1908 tree_node_counts[(int)x_kind]++;
1909 tree_node_sizes[(int)x_kind] += sizeof (struct tree_list);
1912 for (i = (sizeof (struct tree_common) / sizeof (int)) - 1; i >= 0; i--)
1913 ((int *) node)[i] = 0;
1915 TREE_SET_CODE (node, TREE_LIST);
1916 if (current_obstack == &permanent_obstack)
1917 TREE_PERMANENT (node) = 1;
1920 TREE_CHAIN (node) = chain;
1921 TREE_PURPOSE (node) = purpose;
1922 TREE_VALUE (node) = value;
1926 /* Similar, but build on the temp_decl_obstack. */
1929 decl_tree_cons (purpose, value, chain)
1930 tree purpose, value, chain;
1933 register struct obstack *ambient_obstack = current_obstack;
1934 current_obstack = &temp_decl_obstack;
1935 node = tree_cons (purpose, value, chain);
1936 current_obstack = ambient_obstack;
1940 /* Same as `tree_cons' but make a permanent object. */
1943 perm_tree_cons (purpose, value, chain)
1944 tree purpose, value, chain;
1947 register struct obstack *ambient_obstack = current_obstack;
1948 current_obstack = &permanent_obstack;
1950 node = tree_cons (purpose, value, chain);
1951 current_obstack = ambient_obstack;
1955 /* Same as `tree_cons', but make this node temporary, regardless. */
1958 temp_tree_cons (purpose, value, chain)
1959 tree purpose, value, chain;
1962 register struct obstack *ambient_obstack = current_obstack;
1963 current_obstack = &temporary_obstack;
1965 node = tree_cons (purpose, value, chain);
1966 current_obstack = ambient_obstack;
1970 /* Same as `tree_cons', but save this node if the function's RTL is saved. */
1973 saveable_tree_cons (purpose, value, chain)
1974 tree purpose, value, chain;
1977 register struct obstack *ambient_obstack = current_obstack;
1978 current_obstack = saveable_obstack;
1980 node = tree_cons (purpose, value, chain);
1981 current_obstack = ambient_obstack;
1985 /* Return the size nominally occupied by an object of type TYPE
1986 when it resides in memory. The value is measured in units of bytes,
1987 and its data type is that normally used for type sizes
1988 (which is the first type created by make_signed_type or
1989 make_unsigned_type). */
1992 size_in_bytes (type)
1997 if (type == error_mark_node)
1998 return integer_zero_node;
1999 type = TYPE_MAIN_VARIANT (type);
2000 if (TYPE_SIZE (type) == 0)
2002 incomplete_type_error (NULL_TREE, type);
2003 return integer_zero_node;
2005 t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type),
2006 size_int (BITS_PER_UNIT));
2007 if (TREE_CODE (t) == INTEGER_CST)
2008 force_fit_type (t, 0);
2012 /* Return the size of TYPE (in bytes) as an integer,
2013 or return -1 if the size can vary. */
2016 int_size_in_bytes (type)
2020 if (type == error_mark_node)
2022 type = TYPE_MAIN_VARIANT (type);
2023 if (TYPE_SIZE (type) == 0)
2025 if (TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
2027 if (TREE_INT_CST_HIGH (TYPE_SIZE (type)) != 0)
2029 tree t = size_binop (CEIL_DIV_EXPR, TYPE_SIZE (type),
2030 size_int (BITS_PER_UNIT));
2031 return TREE_INT_CST_LOW (t);
2033 size = TREE_INT_CST_LOW (TYPE_SIZE (type));
2034 return (size + BITS_PER_UNIT - 1) / BITS_PER_UNIT;
2037 /* Return, as a tree node, the number of elements for TYPE (which is an
2038 ARRAY_TYPE) minus one. This counts only elements of the top array. */
2041 array_type_nelts (type)
2044 tree index_type = TYPE_DOMAIN (type);
2046 return (integer_zerop (TYPE_MIN_VALUE (index_type))
2047 ? TYPE_MAX_VALUE (index_type)
2048 : fold (build (MINUS_EXPR, TREE_TYPE (TYPE_MAX_VALUE (index_type)),
2049 TYPE_MAX_VALUE (index_type),
2050 TYPE_MIN_VALUE (index_type))));
2053 /* Return nonzero if arg is static -- a reference to an object in
2054 static storage. This is not the same as the C meaning of `static'. */
2060 switch (TREE_CODE (arg))
2063 /* Nested functions aren't static, since taking their address
2064 involves a trampoline. */
2065 return decl_function_context (arg) == 0 || DECL_NO_STATIC_CHAIN (arg);
2067 return TREE_STATIC (arg) || DECL_EXTERNAL (arg);
2070 return TREE_STATIC (arg);
2077 return staticp (TREE_OPERAND (arg, 0));
2080 /* This case is technically correct, but results in setting
2081 TREE_CONSTANT on ADDR_EXPRs that cannot be evaluated at
2084 return TREE_CONSTANT (TREE_OPERAND (arg, 0));
2088 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg))) == INTEGER_CST
2089 && TREE_CODE (TREE_OPERAND (arg, 1)) == INTEGER_CST)
2090 return staticp (TREE_OPERAND (arg, 0));
2096 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
2097 Do this to any expression which may be used in more than one place,
2098 but must be evaluated only once.
2100 Normally, expand_expr would reevaluate the expression each time.
2101 Calling save_expr produces something that is evaluated and recorded
2102 the first time expand_expr is called on it. Subsequent calls to
2103 expand_expr just reuse the recorded value.
2105 The call to expand_expr that generates code that actually computes
2106 the value is the first call *at compile time*. Subsequent calls
2107 *at compile time* generate code to use the saved value.
2108 This produces correct result provided that *at run time* control
2109 always flows through the insns made by the first expand_expr
2110 before reaching the other places where the save_expr was evaluated.
2111 You, the caller of save_expr, must make sure this is so.
2113 Constants, and certain read-only nodes, are returned with no
2114 SAVE_EXPR because that is safe. Expressions containing placeholders
2115 are not touched; see tree.def for an explanation of what these
2122 register tree t = fold (expr);
2124 /* We don't care about whether this can be used as an lvalue in this
2126 while (TREE_CODE (t) == NON_LVALUE_EXPR)
2127 t = TREE_OPERAND (t, 0);
2129 /* If the tree evaluates to a constant, then we don't want to hide that
2130 fact (i.e. this allows further folding, and direct checks for constants).
2131 However, a read-only object that has side effects cannot be bypassed.
2132 Since it is no problem to reevaluate literals, we just return the
2135 if (TREE_CONSTANT (t) || (TREE_READONLY (t) && ! TREE_SIDE_EFFECTS (t))
2136 || TREE_CODE (t) == SAVE_EXPR || TREE_CODE (t) == ERROR_MARK)
2139 /* If T contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
2140 it means that the size or offset of some field of an object depends on
2141 the value within another field.
2143 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
2144 and some variable since it would then need to be both evaluated once and
2145 evaluated more than once. Front-ends must assure this case cannot
2146 happen by surrounding any such subexpressions in their own SAVE_EXPR
2147 and forcing evaluation at the proper time. */
2148 if (contains_placeholder_p (t))
2151 t = build (SAVE_EXPR, TREE_TYPE (expr), t, current_function_decl, NULL_TREE);
2153 /* This expression might be placed ahead of a jump to ensure that the
2154 value was computed on both sides of the jump. So make sure it isn't
2155 eliminated as dead. */
2156 TREE_SIDE_EFFECTS (t) = 1;
2160 /* Arrange for an expression to be expanded multiple independent
2161 times. This is useful for cleanup actions, as the backend can
2162 expand them multiple times in different places. */
2169 /* If this is already protected, no sense in protecting it again. */
2170 if (TREE_CODE (expr) == UNSAVE_EXPR)
2173 t = build1 (UNSAVE_EXPR, TREE_TYPE (expr), expr);
2174 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (expr);
2178 /* Modify a tree in place so that all the evaluate only once things
2179 are cleared out. Return the EXPR given. */
2181 unsave_expr_now (expr)
2184 enum tree_code code;
2187 if (expr == NULL_TREE)
2190 code = TREE_CODE (expr);
2194 SAVE_EXPR_RTL (expr) = NULL_RTX;
2198 TREE_OPERAND (expr, 1) = TREE_OPERAND (expr, 3);
2199 TREE_OPERAND (expr, 3) = NULL_TREE;
2203 /* I don't yet know how to emit a sequence multiple times. */
2204 if (RTL_EXPR_SEQUENCE (expr) != NULL_RTX)
2209 CALL_EXPR_RTL (expr) = NULL_RTX;
2210 if (TREE_OPERAND (expr, 1)
2211 && TREE_CODE (TREE_OPERAND (expr, 1)) == TREE_LIST)
2213 tree exp = TREE_OPERAND (expr, 1);
2216 unsave_expr_now (TREE_VALUE (exp));
2217 exp = TREE_CHAIN (exp);
2223 switch (TREE_CODE_CLASS (code))
2225 case 'c': /* a constant */
2226 case 't': /* a type node */
2227 case 'x': /* something random, like an identifier or an ERROR_MARK. */
2228 case 'd': /* A decl node */
2229 case 'b': /* A block node */
2232 case 'e': /* an expression */
2233 case 'r': /* a reference */
2234 case 's': /* an expression with side effects */
2235 case '<': /* a comparison expression */
2236 case '2': /* a binary arithmetic expression */
2237 case '1': /* a unary arithmetic expression */
2238 for (i = tree_code_length[(int) code] - 1; i >= 0; i--)
2239 unsave_expr_now (TREE_OPERAND (expr, i));
2247 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
2248 or offset that depends on a field within a record.
2250 Note that we only allow such expressions within simple arithmetic
2254 contains_placeholder_p (exp)
2257 register enum tree_code code = TREE_CODE (exp);
2260 /* If we have a WITH_RECORD_EXPR, it "cancels" any PLACEHOLDER_EXPR
2261 in it since it is supplying a value for it. */
2262 if (code == WITH_RECORD_EXPR)
2265 switch (TREE_CODE_CLASS (code))
2268 for (inner = TREE_OPERAND (exp, 0);
2269 TREE_CODE_CLASS (TREE_CODE (inner)) == 'r';
2270 inner = TREE_OPERAND (inner, 0))
2272 return TREE_CODE (inner) == PLACEHOLDER_EXPR;
2277 switch (tree_code_length[(int) code])
2280 return contains_placeholder_p (TREE_OPERAND (exp, 0));
2282 return (code != RTL_EXPR
2283 && code != CONSTRUCTOR
2284 && ! (code == SAVE_EXPR && SAVE_EXPR_RTL (exp) != 0)
2285 && code != WITH_RECORD_EXPR
2286 && (contains_placeholder_p (TREE_OPERAND (exp, 0))
2287 || contains_placeholder_p (TREE_OPERAND (exp, 1))));
2289 return (code == COND_EXPR
2290 && (contains_placeholder_p (TREE_OPERAND (exp, 0))
2291 || contains_placeholder_p (TREE_OPERAND (exp, 1))
2292 || contains_placeholder_p (TREE_OPERAND (exp, 2))));
2299 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
2300 return a tree with all occurrences of references to F in a
2301 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
2302 contains only arithmetic expressions. */
2305 substitute_in_expr (exp, f, r)
2310 enum tree_code code = TREE_CODE (exp);
2315 switch (TREE_CODE_CLASS (code))
2322 if (code == PLACEHOLDER_EXPR)
2330 switch (tree_code_length[(int) code])
2333 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2334 if (op0 == TREE_OPERAND (exp, 0))
2337 new = fold (build1 (code, TREE_TYPE (exp), op0));
2341 /* An RTL_EXPR cannot contain a PLACEHOLDER_EXPR; a CONSTRUCTOR
2342 could, but we don't support it. */
2343 if (code == RTL_EXPR)
2345 else if (code == CONSTRUCTOR)
2348 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2349 op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
2350 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
2353 new = fold (build (code, TREE_TYPE (exp), op0, op1));
2357 /* It cannot be that anything inside a SAVE_EXPR contains a
2358 PLACEHOLDER_EXPR. */
2359 if (code == SAVE_EXPR)
2362 if (code != COND_EXPR)
2365 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2366 op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
2367 op2 = substitute_in_expr (TREE_OPERAND (exp, 2), f, r);
2368 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
2369 && op2 == TREE_OPERAND (exp, 2))
2372 new = fold (build (code, TREE_TYPE (exp), op0, op1, op2));
2381 /* If this expression is getting a value from a PLACEHOLDER_EXPR
2382 and it is the right field, replace it with R. */
2383 for (inner = TREE_OPERAND (exp, 0);
2384 TREE_CODE_CLASS (TREE_CODE (inner)) == 'r';
2385 inner = TREE_OPERAND (inner, 0))
2387 if (TREE_CODE (inner) == PLACEHOLDER_EXPR
2388 && TREE_OPERAND (exp, 1) == f)
2391 /* If this expression hasn't been completed let, leave it
2393 if (TREE_CODE (inner) == PLACEHOLDER_EXPR
2394 && TREE_TYPE (inner) == 0)
2397 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2398 if (op0 == TREE_OPERAND (exp, 0))
2401 new = fold (build (code, TREE_TYPE (exp), op0,
2402 TREE_OPERAND (exp, 1)));
2406 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2407 op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
2408 op2 = substitute_in_expr (TREE_OPERAND (exp, 2), f, r);
2409 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
2410 && op2 == TREE_OPERAND (exp, 2))
2413 new = fold (build (code, TREE_TYPE (exp), op0, op1, op2));
2418 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2419 if (op0 == TREE_OPERAND (exp, 0))
2422 new = fold (build1 (code, TREE_TYPE (exp), op0));
2426 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2427 op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
2428 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
2431 new = fold (build (code, TREE_TYPE (exp), op0, op1));
2436 /* If it wasn't one of the cases we handle, give up. */
2440 TREE_READONLY (new) = TREE_READONLY (exp);
2444 /* Stabilize a reference so that we can use it any number of times
2445 without causing its operands to be evaluated more than once.
2446 Returns the stabilized reference. This works by means of save_expr,
2447 so see the caveats in the comments about save_expr.
2449 Also allows conversion expressions whose operands are references.
2450 Any other kind of expression is returned unchanged. */
2453 stabilize_reference (ref)
2456 register tree result;
2457 register enum tree_code code = TREE_CODE (ref);
2464 /* No action is needed in this case. */
2470 case FIX_TRUNC_EXPR:
2471 case FIX_FLOOR_EXPR:
2472 case FIX_ROUND_EXPR:
2474 result = build_nt (code, stabilize_reference (TREE_OPERAND (ref, 0)));
2478 result = build_nt (INDIRECT_REF,
2479 stabilize_reference_1 (TREE_OPERAND (ref, 0)));
2483 result = build_nt (COMPONENT_REF,
2484 stabilize_reference (TREE_OPERAND (ref, 0)),
2485 TREE_OPERAND (ref, 1));
2489 result = build_nt (BIT_FIELD_REF,
2490 stabilize_reference (TREE_OPERAND (ref, 0)),
2491 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
2492 stabilize_reference_1 (TREE_OPERAND (ref, 2)));
2496 result = build_nt (ARRAY_REF,
2497 stabilize_reference (TREE_OPERAND (ref, 0)),
2498 stabilize_reference_1 (TREE_OPERAND (ref, 1)));
2502 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2503 it wouldn't be ignored. This matters when dealing with
2505 return stabilize_reference_1 (ref);
2508 result = build1 (INDIRECT_REF, TREE_TYPE (ref),
2509 save_expr (build1 (ADDR_EXPR,
2510 build_pointer_type (TREE_TYPE (ref)),
2515 /* If arg isn't a kind of lvalue we recognize, make no change.
2516 Caller should recognize the error for an invalid lvalue. */
2521 return error_mark_node;
2524 TREE_TYPE (result) = TREE_TYPE (ref);
2525 TREE_READONLY (result) = TREE_READONLY (ref);
2526 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (ref);
2527 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);
2528 TREE_RAISES (result) = TREE_RAISES (ref);
2533 /* Subroutine of stabilize_reference; this is called for subtrees of
2534 references. Any expression with side-effects must be put in a SAVE_EXPR
2535 to ensure that it is only evaluated once.
2537 We don't put SAVE_EXPR nodes around everything, because assigning very
2538 simple expressions to temporaries causes us to miss good opportunities
2539 for optimizations. Among other things, the opportunity to fold in the
2540 addition of a constant into an addressing mode often gets lost, e.g.
2541 "y[i+1] += x;". In general, we take the approach that we should not make
2542 an assignment unless we are forced into it - i.e., that any non-side effect
2543 operator should be allowed, and that cse should take care of coalescing
2544 multiple utterances of the same expression should that prove fruitful. */
2547 stabilize_reference_1 (e)
2550 register tree result;
2551 register enum tree_code code = TREE_CODE (e);
2553 /* We cannot ignore const expressions because it might be a reference
2554 to a const array but whose index contains side-effects. But we can
2555 ignore things that are actual constant or that already have been
2556 handled by this function. */
2558 if (TREE_CONSTANT (e) || code == SAVE_EXPR)
2561 switch (TREE_CODE_CLASS (code))
2571 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2572 so that it will only be evaluated once. */
2573 /* The reference (r) and comparison (<) classes could be handled as
2574 below, but it is generally faster to only evaluate them once. */
2575 if (TREE_SIDE_EFFECTS (e))
2576 return save_expr (e);
2580 /* Constants need no processing. In fact, we should never reach
2585 /* Division is slow and tends to be compiled with jumps,
2586 especially the division by powers of 2 that is often
2587 found inside of an array reference. So do it just once. */
2588 if (code == TRUNC_DIV_EXPR || code == TRUNC_MOD_EXPR
2589 || code == FLOOR_DIV_EXPR || code == FLOOR_MOD_EXPR
2590 || code == CEIL_DIV_EXPR || code == CEIL_MOD_EXPR
2591 || code == ROUND_DIV_EXPR || code == ROUND_MOD_EXPR)
2592 return save_expr (e);
2593 /* Recursively stabilize each operand. */
2594 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)),
2595 stabilize_reference_1 (TREE_OPERAND (e, 1)));
2599 /* Recursively stabilize each operand. */
2600 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)));
2607 TREE_TYPE (result) = TREE_TYPE (e);
2608 TREE_READONLY (result) = TREE_READONLY (e);
2609 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (e);
2610 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);
2611 TREE_RAISES (result) = TREE_RAISES (e);
2616 /* Low-level constructors for expressions. */
2618 /* Build an expression of code CODE, data type TYPE,
2619 and operands as specified by the arguments ARG1 and following arguments.
2620 Expressions and reference nodes can be created this way.
2621 Constants, decls, types and misc nodes cannot be. */
2624 build VPROTO((enum tree_code code, tree tt, ...))
2627 enum tree_code code;
2632 register int length;
2638 code = va_arg (p, enum tree_code);
2639 tt = va_arg (p, tree);
2642 t = make_node (code);
2643 length = tree_code_length[(int) code];
2648 /* This is equivalent to the loop below, but faster. */
2649 register tree arg0 = va_arg (p, tree);
2650 register tree arg1 = va_arg (p, tree);
2651 TREE_OPERAND (t, 0) = arg0;
2652 TREE_OPERAND (t, 1) = arg1;
2653 if ((arg0 && TREE_SIDE_EFFECTS (arg0))
2654 || (arg1 && TREE_SIDE_EFFECTS (arg1)))
2655 TREE_SIDE_EFFECTS (t) = 1;
2657 = (arg0 && TREE_RAISES (arg0)) || (arg1 && TREE_RAISES (arg1));
2659 else if (length == 1)
2661 register tree arg0 = va_arg (p, tree);
2663 /* Call build1 for this! */
2664 if (TREE_CODE_CLASS (code) != 's')
2666 TREE_OPERAND (t, 0) = arg0;
2667 if (arg0 && TREE_SIDE_EFFECTS (arg0))
2668 TREE_SIDE_EFFECTS (t) = 1;
2669 TREE_RAISES (t) = (arg0 && TREE_RAISES (arg0));
2673 for (i = 0; i < length; i++)
2675 register tree operand = va_arg (p, tree);
2676 TREE_OPERAND (t, i) = operand;
2679 if (TREE_SIDE_EFFECTS (operand))
2680 TREE_SIDE_EFFECTS (t) = 1;
2681 if (TREE_RAISES (operand))
2682 TREE_RAISES (t) = 1;
2690 /* Same as above, but only builds for unary operators.
2691 Saves lions share of calls to `build'; cuts down use
2692 of varargs, which is expensive for RISC machines. */
2694 build1 (code, type, node)
2695 enum tree_code code;
2699 register struct obstack *obstack = current_obstack;
2700 register int i, length;
2701 register tree_node_kind kind;
2704 #ifdef GATHER_STATISTICS
2705 if (TREE_CODE_CLASS (code) == 'r')
2711 obstack = expression_obstack;
2712 length = sizeof (struct tree_exp);
2714 t = (tree) obstack_alloc (obstack, length);
2716 #ifdef GATHER_STATISTICS
2717 tree_node_counts[(int)kind]++;
2718 tree_node_sizes[(int)kind] += length;
2721 for (i = (length / sizeof (int)) - 1; i >= 0; i--)
2724 TREE_TYPE (t) = type;
2725 TREE_SET_CODE (t, code);
2727 if (obstack == &permanent_obstack)
2728 TREE_PERMANENT (t) = 1;
2730 TREE_OPERAND (t, 0) = node;
2733 if (TREE_SIDE_EFFECTS (node))
2734 TREE_SIDE_EFFECTS (t) = 1;
2735 if (TREE_RAISES (node))
2736 TREE_RAISES (t) = 1;
2742 /* Similar except don't specify the TREE_TYPE
2743 and leave the TREE_SIDE_EFFECTS as 0.
2744 It is permissible for arguments to be null,
2745 or even garbage if their values do not matter. */
2748 build_nt VPROTO((enum tree_code code, ...))
2751 enum tree_code code;
2755 register int length;
2761 code = va_arg (p, enum tree_code);
2764 t = make_node (code);
2765 length = tree_code_length[(int) code];
2767 for (i = 0; i < length; i++)
2768 TREE_OPERAND (t, i) = va_arg (p, tree);
2774 /* Similar to `build_nt', except we build
2775 on the temp_decl_obstack, regardless. */
2778 build_parse_node VPROTO((enum tree_code code, ...))
2781 enum tree_code code;
2783 register struct obstack *ambient_obstack = expression_obstack;
2786 register int length;
2792 code = va_arg (p, enum tree_code);
2795 expression_obstack = &temp_decl_obstack;
2797 t = make_node (code);
2798 length = tree_code_length[(int) code];
2800 for (i = 0; i < length; i++)
2801 TREE_OPERAND (t, i) = va_arg (p, tree);
2804 expression_obstack = ambient_obstack;
2809 /* Commented out because this wants to be done very
2810 differently. See cp-lex.c. */
2812 build_op_identifier (op1, op2)
2815 register tree t = make_node (OP_IDENTIFIER);
2816 TREE_PURPOSE (t) = op1;
2817 TREE_VALUE (t) = op2;
2822 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
2823 We do NOT enter this node in any sort of symbol table.
2825 layout_decl is used to set up the decl's storage layout.
2826 Other slots are initialized to 0 or null pointers. */
2829 build_decl (code, name, type)
2830 enum tree_code code;
2835 t = make_node (code);
2837 /* if (type == error_mark_node)
2838 type = integer_type_node; */
2839 /* That is not done, deliberately, so that having error_mark_node
2840 as the type can suppress useless errors in the use of this variable. */
2842 DECL_NAME (t) = name;
2843 DECL_ASSEMBLER_NAME (t) = name;
2844 TREE_TYPE (t) = type;
2846 if (code == VAR_DECL || code == PARM_DECL || code == RESULT_DECL)
2848 else if (code == FUNCTION_DECL)
2849 DECL_MODE (t) = FUNCTION_MODE;
2854 /* BLOCK nodes are used to represent the structure of binding contours
2855 and declarations, once those contours have been exited and their contents
2856 compiled. This information is used for outputting debugging info. */
2859 build_block (vars, tags, subblocks, supercontext, chain)
2860 tree vars, tags, subblocks, supercontext, chain;
2862 register tree block = make_node (BLOCK);
2863 BLOCK_VARS (block) = vars;
2864 BLOCK_TYPE_TAGS (block) = tags;
2865 BLOCK_SUBBLOCKS (block) = subblocks;
2866 BLOCK_SUPERCONTEXT (block) = supercontext;
2867 BLOCK_CHAIN (block) = chain;
2871 /* Return a declaration like DDECL except that its DECL_MACHINE_ATTRIBUTE
2875 build_decl_attribute_variant (ddecl, attribute)
2876 tree ddecl, attribute;
2878 DECL_MACHINE_ATTRIBUTES (ddecl) = attribute;
2882 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
2885 Record such modified types already made so we don't make duplicates. */
2888 build_type_attribute_variant (ttype, attribute)
2889 tree ttype, attribute;
2891 if ( ! attribute_list_equal (TYPE_ATTRIBUTES (ttype), attribute))
2893 register int hashcode;
2894 register struct obstack *ambient_obstack = current_obstack;
2897 if (ambient_obstack != &permanent_obstack)
2898 current_obstack = TYPE_OBSTACK (ttype);
2900 ntype = copy_node (ttype);
2901 current_obstack = ambient_obstack;
2903 TYPE_POINTER_TO (ntype) = 0;
2904 TYPE_REFERENCE_TO (ntype) = 0;
2905 TYPE_ATTRIBUTES (ntype) = attribute;
2907 /* Create a new main variant of TYPE. */
2908 TYPE_MAIN_VARIANT (ntype) = ntype;
2909 TYPE_NEXT_VARIANT (ntype) = 0;
2910 TYPE_READONLY (ntype) = TYPE_VOLATILE (ntype) = 0;
2912 hashcode = TYPE_HASH (TREE_CODE (ntype))
2913 + TYPE_HASH (TREE_TYPE (ntype))
2914 + attribute_hash_list (attribute);
2916 switch (TREE_CODE (ntype))
2919 hashcode += TYPE_HASH (TYPE_ARG_TYPES (ntype));
2922 hashcode += TYPE_HASH (TYPE_DOMAIN (ntype));
2925 hashcode += TYPE_HASH (TYPE_MAX_VALUE (ntype));
2928 hashcode += TYPE_HASH (TYPE_PRECISION (ntype));
2932 ntype = type_hash_canon (hashcode, ntype);
2933 ttype = build_type_variant (ntype, TYPE_READONLY (ttype),
2934 TYPE_VOLATILE (ttype));
2940 /* Return a 1 if ATTR_NAME and ATTR_ARGS is valid for either declaration DECL
2941 or type TYPE and 0 otherwise. Validity is determined the configuration
2942 macros VALID_MACHINE_DECL_ATTRIBUTE and VALID_MACHINE_TYPE_ATTRIBUTE. */
2945 valid_machine_attribute (attr_name, attr_args, decl, type)
2946 tree attr_name, attr_args;
2951 tree decl_attr_list = decl != 0 ? DECL_MACHINE_ATTRIBUTES (decl) : 0;
2952 tree type_attr_list = TYPE_ATTRIBUTES (type);
2954 if (TREE_CODE (attr_name) != IDENTIFIER_NODE)
2957 #ifdef VALID_MACHINE_DECL_ATTRIBUTE
2959 && VALID_MACHINE_DECL_ATTRIBUTE (decl, decl_attr_list, attr_name, attr_args))
2961 tree attr = lookup_attribute (IDENTIFIER_POINTER (attr_name),
2964 if (attr != NULL_TREE)
2966 /* Override existing arguments. Declarations are unique so we can
2967 modify this in place. */
2968 TREE_VALUE (attr) = attr_args;
2972 decl_attr_list = tree_cons (attr_name, attr_args, decl_attr_list);
2973 decl = build_decl_attribute_variant (decl, decl_attr_list);
2980 #ifdef VALID_MACHINE_TYPE_ATTRIBUTE
2981 if (VALID_MACHINE_TYPE_ATTRIBUTE (type, type_attr_list, attr_name, attr_args))
2983 tree attr = lookup_attribute (IDENTIFIER_POINTER (attr_name),
2986 if (attr != NULL_TREE)
2988 /* Override existing arguments.
2989 ??? This currently works since attribute arguments are not
2990 included in `attribute_hash_list'. Something more complicated
2991 may be needed in the future. */
2992 TREE_VALUE (attr) = attr_args;
2996 type_attr_list = tree_cons (attr_name, attr_args, type_attr_list);
2997 type = build_type_attribute_variant (type, type_attr_list);
3000 TREE_TYPE (decl) = type;
3004 /* Handle putting a type attribute on pointer-to-function-type by putting
3005 the attribute on the function type. */
3006 else if (TREE_CODE (type) == POINTER_TYPE
3007 && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE
3008 && VALID_MACHINE_TYPE_ATTRIBUTE (TREE_TYPE (type), type_attr_list,
3009 attr_name, attr_args))
3011 tree inner_type = TREE_TYPE (type);
3012 tree inner_attr_list = TYPE_ATTRIBUTES (inner_type);
3013 tree attr = lookup_attribute (IDENTIFIER_POINTER (attr_name),
3016 if (attr != NULL_TREE)
3017 TREE_VALUE (attr) = attr_args;
3020 inner_attr_list = tree_cons (attr_name, attr_args, inner_attr_list);
3021 inner_type = build_type_attribute_variant (inner_type,
3026 TREE_TYPE (decl) = build_pointer_type (inner_type);
3035 /* Return non-zero if IDENT is a valid name for attribute ATTR,
3038 We try both `text' and `__text__', ATTR may be either one. */
3039 /* ??? It might be a reasonable simplification to require ATTR to be only
3040 `text'. One might then also require attribute lists to be stored in
3041 their canonicalized form. */
3044 is_attribute_p (attr, ident)
3048 int ident_len, attr_len;
3051 if (TREE_CODE (ident) != IDENTIFIER_NODE)
3054 if (strcmp (attr, IDENTIFIER_POINTER (ident)) == 0)
3057 p = IDENTIFIER_POINTER (ident);
3058 ident_len = strlen (p);
3059 attr_len = strlen (attr);
3061 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
3065 || attr[attr_len - 2] != '_'
3066 || attr[attr_len - 1] != '_')
3068 if (ident_len == attr_len - 4
3069 && strncmp (attr + 2, p, attr_len - 4) == 0)
3074 if (ident_len == attr_len + 4
3075 && p[0] == '_' && p[1] == '_'
3076 && p[ident_len - 2] == '_' && p[ident_len - 1] == '_'
3077 && strncmp (attr, p + 2, attr_len) == 0)
3084 /* Given an attribute name and a list of attributes, return a pointer to the
3085 attribute's list element if the attribute is part of the list, or NULL_TREE
3089 lookup_attribute (attr_name, list)
3095 for (l = list; l; l = TREE_CHAIN (l))
3097 if (TREE_CODE (TREE_PURPOSE (l)) != IDENTIFIER_NODE)
3099 if (is_attribute_p (attr_name, TREE_PURPOSE (l)))
3106 /* Return an attribute list that is the union of a1 and a2. */
3109 merge_attributes (a1, a2)
3110 register tree a1, a2;
3114 /* Either one unset? Take the set one. */
3116 if (! (attributes = a1))
3119 /* One that completely contains the other? Take it. */
3121 else if (a2 && ! attribute_list_contained (a1, a2))
3122 if (attribute_list_contained (a2, a1))
3126 /* Pick the longest list, and hang on the other list. */
3127 /* ??? For the moment we punt on the issue of attrs with args. */
3129 if (list_length (a1) < list_length (a2))
3130 attributes = a2, a2 = a1;
3132 for (; a2; a2 = TREE_CHAIN (a2))
3133 if (lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)),
3134 attributes) == NULL_TREE)
3136 a1 = copy_node (a2);
3137 TREE_CHAIN (a1) = attributes;
3144 /* Return a type like TYPE except that its TYPE_READONLY is CONSTP
3145 and its TYPE_VOLATILE is VOLATILEP.
3147 Such variant types already made are recorded so that duplicates
3150 A variant types should never be used as the type of an expression.
3151 Always copy the variant information into the TREE_READONLY
3152 and TREE_THIS_VOLATILE of the expression, and then give the expression
3153 as its type the "main variant", the variant whose TYPE_READONLY
3154 and TYPE_VOLATILE are zero. Use TYPE_MAIN_VARIANT to find the
3158 build_type_variant (type, constp, volatilep)
3160 int constp, volatilep;
3164 /* Treat any nonzero argument as 1. */
3166 volatilep = !!volatilep;
3168 /* Search the chain of variants to see if there is already one there just
3169 like the one we need to have. If so, use that existing one. We must
3170 preserve the TYPE_NAME, since there is code that depends on this. */
3172 for (t = TYPE_MAIN_VARIANT(type); t; t = TYPE_NEXT_VARIANT (t))
3173 if (constp == TYPE_READONLY (t) && volatilep == TYPE_VOLATILE (t)
3174 && TYPE_NAME (t) == TYPE_NAME (type))
3177 /* We need a new one. */
3179 t = build_type_copy (type);
3180 TYPE_READONLY (t) = constp;
3181 TYPE_VOLATILE (t) = volatilep;
3186 /* Give TYPE a new main variant: NEW_MAIN.
3187 This is the right thing to do only when something else
3188 about TYPE is modified in place. */
3191 change_main_variant (type, new_main)
3192 tree type, new_main;
3195 tree omain = TYPE_MAIN_VARIANT (type);
3197 /* Remove TYPE from the TYPE_NEXT_VARIANT chain of its main variant. */
3198 if (TYPE_NEXT_VARIANT (omain) == type)
3199 TYPE_NEXT_VARIANT (omain) = TYPE_NEXT_VARIANT (type);
3201 for (t = TYPE_NEXT_VARIANT (omain); t && TYPE_NEXT_VARIANT (t);
3202 t = TYPE_NEXT_VARIANT (t))
3203 if (TYPE_NEXT_VARIANT (t) == type)
3205 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (type);
3209 TYPE_MAIN_VARIANT (type) = new_main;
3210 TYPE_NEXT_VARIANT (type) = TYPE_NEXT_VARIANT (new_main);
3211 TYPE_NEXT_VARIANT (new_main) = type;
3214 /* Create a new variant of TYPE, equivalent but distinct.
3215 This is so the caller can modify it. */
3218 build_type_copy (type)
3221 register tree t, m = TYPE_MAIN_VARIANT (type);
3222 register struct obstack *ambient_obstack = current_obstack;
3224 current_obstack = TYPE_OBSTACK (type);
3225 t = copy_node (type);
3226 current_obstack = ambient_obstack;
3228 TYPE_POINTER_TO (t) = 0;
3229 TYPE_REFERENCE_TO (t) = 0;
3231 /* Add this type to the chain of variants of TYPE. */
3232 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (m);
3233 TYPE_NEXT_VARIANT (m) = t;
3238 /* Hashing of types so that we don't make duplicates.
3239 The entry point is `type_hash_canon'. */
3241 /* Each hash table slot is a bucket containing a chain
3242 of these structures. */
3246 struct type_hash *next; /* Next structure in the bucket. */
3247 int hashcode; /* Hash code of this type. */
3248 tree type; /* The type recorded here. */
3251 /* Now here is the hash table. When recording a type, it is added
3252 to the slot whose index is the hash code mod the table size.
3253 Note that the hash table is used for several kinds of types
3254 (function types, array types and array index range types, for now).
3255 While all these live in the same table, they are completely independent,
3256 and the hash code is computed differently for each of these. */
3258 #define TYPE_HASH_SIZE 59
3259 struct type_hash *type_hash_table[TYPE_HASH_SIZE];
3261 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
3262 with types in the TREE_VALUE slots), by adding the hash codes
3263 of the individual types. */
3266 type_hash_list (list)
3269 register int hashcode;
3271 for (hashcode = 0, tail = list; tail; tail = TREE_CHAIN (tail))
3272 hashcode += TYPE_HASH (TREE_VALUE (tail));
3276 /* Look in the type hash table for a type isomorphic to TYPE.
3277 If one is found, return it. Otherwise return 0. */
3280 type_hash_lookup (hashcode, type)
3284 register struct type_hash *h;
3285 for (h = type_hash_table[hashcode % TYPE_HASH_SIZE]; h; h = h->next)
3286 if (h->hashcode == hashcode
3287 && TREE_CODE (h->type) == TREE_CODE (type)
3288 && TREE_TYPE (h->type) == TREE_TYPE (type)
3289 && attribute_list_equal (TYPE_ATTRIBUTES (h->type),
3290 TYPE_ATTRIBUTES (type))
3291 && (TYPE_MAX_VALUE (h->type) == TYPE_MAX_VALUE (type)
3292 || tree_int_cst_equal (TYPE_MAX_VALUE (h->type),
3293 TYPE_MAX_VALUE (type)))
3294 && (TYPE_MIN_VALUE (h->type) == TYPE_MIN_VALUE (type)
3295 || tree_int_cst_equal (TYPE_MIN_VALUE (h->type),
3296 TYPE_MIN_VALUE (type)))
3297 /* Note that TYPE_DOMAIN is TYPE_ARG_TYPES for FUNCTION_TYPE. */
3298 && (TYPE_DOMAIN (h->type) == TYPE_DOMAIN (type)
3299 || (TYPE_DOMAIN (h->type)
3300 && TREE_CODE (TYPE_DOMAIN (h->type)) == TREE_LIST
3301 && TYPE_DOMAIN (type)
3302 && TREE_CODE (TYPE_DOMAIN (type)) == TREE_LIST
3303 && type_list_equal (TYPE_DOMAIN (h->type),
3304 TYPE_DOMAIN (type)))))
3309 /* Add an entry to the type-hash-table
3310 for a type TYPE whose hash code is HASHCODE. */
3313 type_hash_add (hashcode, type)
3317 register struct type_hash *h;
3319 h = (struct type_hash *) oballoc (sizeof (struct type_hash));
3320 h->hashcode = hashcode;
3322 h->next = type_hash_table[hashcode % TYPE_HASH_SIZE];
3323 type_hash_table[hashcode % TYPE_HASH_SIZE] = h;
3326 /* Given TYPE, and HASHCODE its hash code, return the canonical
3327 object for an identical type if one already exists.
3328 Otherwise, return TYPE, and record it as the canonical object
3329 if it is a permanent object.
3331 To use this function, first create a type of the sort you want.
3332 Then compute its hash code from the fields of the type that
3333 make it different from other similar types.
3334 Then call this function and use the value.
3335 This function frees the type you pass in if it is a duplicate. */
3337 /* Set to 1 to debug without canonicalization. Never set by program. */
3338 int debug_no_type_hash = 0;
3341 type_hash_canon (hashcode, type)
3347 if (debug_no_type_hash)
3350 t1 = type_hash_lookup (hashcode, type);
3353 obstack_free (TYPE_OBSTACK (type), type);
3354 #ifdef GATHER_STATISTICS
3355 tree_node_counts[(int)t_kind]--;
3356 tree_node_sizes[(int)t_kind] -= sizeof (struct tree_type);
3361 /* If this is a permanent type, record it for later reuse. */
3362 if (TREE_PERMANENT (type))
3363 type_hash_add (hashcode, type);
3368 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
3369 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
3370 by adding the hash codes of the individual attributes. */
3373 attribute_hash_list (list)
3376 register int hashcode;
3378 for (hashcode = 0, tail = list; tail; tail = TREE_CHAIN (tail))
3379 /* ??? Do we want to add in TREE_VALUE too? */
3380 hashcode += TYPE_HASH (TREE_PURPOSE (tail));
3384 /* Given two lists of attributes, return true if list l2 is
3385 equivalent to l1. */
3388 attribute_list_equal (l1, l2)
3391 return attribute_list_contained (l1, l2)
3392 && attribute_list_contained (l2, l1);
3395 /* Given two lists of attributes, return true if list L2 is
3396 completely contained within L1. */
3397 /* ??? This would be faster if attribute names were stored in a canonicalized
3398 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
3399 must be used to show these elements are equivalent (which they are). */
3400 /* ??? It's not clear that attributes with arguments will always be handled
3404 attribute_list_contained (l1, l2)
3407 register tree t1, t2;
3409 /* First check the obvious, maybe the lists are identical. */
3413 /* Maybe the lists are similar. */
3414 for (t1 = l1, t2 = l2;
3416 && TREE_PURPOSE (t1) == TREE_PURPOSE (t2)
3417 && TREE_VALUE (t1) == TREE_VALUE (t2);
3418 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2));
3420 /* Maybe the lists are equal. */
3421 if (t1 == 0 && t2 == 0)
3424 for (; t2; t2 = TREE_CHAIN (t2))
3427 = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)), l1);
3429 if (attr == NULL_TREE)
3431 if (simple_cst_equal (TREE_VALUE (t2), TREE_VALUE (attr)) != 1)
3438 /* Given two lists of types
3439 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
3440 return 1 if the lists contain the same types in the same order.
3441 Also, the TREE_PURPOSEs must match. */
3444 type_list_equal (l1, l2)
3447 register tree t1, t2;
3449 for (t1 = l1, t2 = l2; t1 && t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
3450 if (TREE_VALUE (t1) != TREE_VALUE (t2)
3451 || (TREE_PURPOSE (t1) != TREE_PURPOSE (t2)
3452 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2))
3453 && (TREE_TYPE (TREE_PURPOSE (t1))
3454 == TREE_TYPE (TREE_PURPOSE (t2))))))
3460 /* Nonzero if integer constants T1 and T2
3461 represent the same constant value. */
3464 tree_int_cst_equal (t1, t2)
3469 if (t1 == 0 || t2 == 0)
3471 if (TREE_CODE (t1) == INTEGER_CST
3472 && TREE_CODE (t2) == INTEGER_CST
3473 && TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
3474 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2))
3479 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
3480 The precise way of comparison depends on their data type. */
3483 tree_int_cst_lt (t1, t2)
3489 if (!TREE_UNSIGNED (TREE_TYPE (t1)))
3490 return INT_CST_LT (t1, t2);
3491 return INT_CST_LT_UNSIGNED (t1, t2);
3494 /* Return an indication of the sign of the integer constant T.
3495 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
3496 Note that -1 will never be returned it T's type is unsigned. */
3499 tree_int_cst_sgn (t)
3502 if (TREE_INT_CST_LOW (t) == 0 && TREE_INT_CST_HIGH (t) == 0)
3504 else if (TREE_UNSIGNED (TREE_TYPE (t)))
3506 else if (TREE_INT_CST_HIGH (t) < 0)
3512 /* Compare two constructor-element-type constants. Return 1 if the lists
3513 are known to be equal; otherwise return 0. */
3516 simple_cst_list_equal (l1, l2)
3519 while (l1 != NULL_TREE && l2 != NULL_TREE)
3521 if (simple_cst_equal (TREE_VALUE (l1), TREE_VALUE (l2)) != 1)
3524 l1 = TREE_CHAIN (l1);
3525 l2 = TREE_CHAIN (l2);
3531 /* Return truthvalue of whether T1 is the same tree structure as T2.
3532 Return 1 if they are the same.
3533 Return 0 if they are understandably different.
3534 Return -1 if either contains tree structure not understood by
3538 simple_cst_equal (t1, t2)
3541 register enum tree_code code1, code2;
3546 if (t1 == 0 || t2 == 0)
3549 code1 = TREE_CODE (t1);
3550 code2 = TREE_CODE (t2);
3552 if (code1 == NOP_EXPR || code1 == CONVERT_EXPR || code1 == NON_LVALUE_EXPR)
3553 if (code2 == NOP_EXPR || code2 == CONVERT_EXPR || code2 == NON_LVALUE_EXPR)
3554 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3556 return simple_cst_equal (TREE_OPERAND (t1, 0), t2);
3557 else if (code2 == NOP_EXPR || code2 == CONVERT_EXPR
3558 || code2 == NON_LVALUE_EXPR)
3559 return simple_cst_equal (t1, TREE_OPERAND (t2, 0));
3567 return TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
3568 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2);
3571 return REAL_VALUES_EQUAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
3574 return TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
3575 && !bcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
3576 TREE_STRING_LENGTH (t1));
3582 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3585 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3588 return simple_cst_list_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
3591 /* Special case: if either target is an unallocated VAR_DECL,
3592 it means that it's going to be unified with whatever the
3593 TARGET_EXPR is really supposed to initialize, so treat it
3594 as being equivalent to anything. */
3595 if ((TREE_CODE (TREE_OPERAND (t1, 0)) == VAR_DECL
3596 && DECL_NAME (TREE_OPERAND (t1, 0)) == NULL_TREE
3597 && DECL_RTL (TREE_OPERAND (t1, 0)) == 0)
3598 || (TREE_CODE (TREE_OPERAND (t2, 0)) == VAR_DECL
3599 && DECL_NAME (TREE_OPERAND (t2, 0)) == NULL_TREE
3600 && DECL_RTL (TREE_OPERAND (t2, 0)) == 0))
3603 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3606 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
3608 case WITH_CLEANUP_EXPR:
3609 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3612 return simple_cst_equal (TREE_OPERAND (t1, 2), TREE_OPERAND (t1, 2));
3615 if (TREE_OPERAND (t1, 1) == TREE_OPERAND (t2, 1))
3616 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3626 /* This general rule works for most tree codes. All exceptions should be
3627 handled above. If this is a language-specific tree code, we can't
3628 trust what might be in the operand, so say we don't know
3631 >= sizeof standard_tree_code_type / sizeof standard_tree_code_type[0])
3634 switch (TREE_CODE_CLASS (code1))
3644 for (i=0; i<tree_code_length[(int) code1]; ++i)
3646 cmp = simple_cst_equal (TREE_OPERAND (t1, i), TREE_OPERAND (t2, i));
3656 /* Constructors for pointer, array and function types.
3657 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
3658 constructed by language-dependent code, not here.) */
3660 /* Construct, lay out and return the type of pointers to TO_TYPE.
3661 If such a type has already been constructed, reuse it. */
3664 build_pointer_type (to_type)
3667 register tree t = TYPE_POINTER_TO (to_type);
3669 /* First, if we already have a type for pointers to TO_TYPE, use it. */
3674 /* We need a new one. Put this in the same obstack as TO_TYPE. */
3675 push_obstacks (TYPE_OBSTACK (to_type), TYPE_OBSTACK (to_type));
3676 t = make_node (POINTER_TYPE);
3679 TREE_TYPE (t) = to_type;
3681 /* Record this type as the pointer to TO_TYPE. */
3682 TYPE_POINTER_TO (to_type) = t;
3684 /* Lay out the type. This function has many callers that are concerned
3685 with expression-construction, and this simplifies them all.
3686 Also, it guarantees the TYPE_SIZE is in the same obstack as the type. */
3692 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
3693 MAXVAL should be the maximum value in the domain
3694 (one less than the length of the array). */
3697 build_index_type (maxval)
3700 register tree itype = make_node (INTEGER_TYPE);
3701 TYPE_PRECISION (itype) = TYPE_PRECISION (sizetype);
3702 TYPE_MIN_VALUE (itype) = build_int_2 (0, 0);
3703 TREE_TYPE (TYPE_MIN_VALUE (itype)) = sizetype;
3704 TYPE_MAX_VALUE (itype) = convert (sizetype, maxval);
3705 TYPE_MODE (itype) = TYPE_MODE (sizetype);
3706 TYPE_SIZE (itype) = TYPE_SIZE (sizetype);
3707 TYPE_ALIGN (itype) = TYPE_ALIGN (sizetype);
3708 if (TREE_CODE (maxval) == INTEGER_CST)
3710 int maxint = (int) TREE_INT_CST_LOW (maxval);
3711 /* If the domain should be empty, make sure the maxval
3712 remains -1 and is not spoiled by truncation. */
3713 if (INT_CST_LT (maxval, integer_zero_node))
3715 TYPE_MAX_VALUE (itype) = build_int_2 (-1, -1);
3716 TREE_TYPE (TYPE_MAX_VALUE (itype)) = sizetype;
3718 return type_hash_canon (maxint < 0 ? ~maxint : maxint, itype);
3724 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
3725 ENUMERAL_TYPE, BOOLEAN_TYPE, or CHAR_TYPE), with
3726 low bound LOWVAL and high bound HIGHVAL.
3727 if TYPE==NULL_TREE, sizetype is used. */
3730 build_range_type (type, lowval, highval)
3731 tree type, lowval, highval;
3733 register tree itype = make_node (INTEGER_TYPE);
3734 TREE_TYPE (itype) = type;
3735 if (type == NULL_TREE)
3737 TYPE_PRECISION (itype) = TYPE_PRECISION (type);
3738 TYPE_MIN_VALUE (itype) = convert (type, lowval);
3739 TYPE_MAX_VALUE (itype) = convert (type, highval);
3740 TYPE_MODE (itype) = TYPE_MODE (type);
3741 TYPE_SIZE (itype) = TYPE_SIZE (type);
3742 TYPE_ALIGN (itype) = TYPE_ALIGN (type);
3743 if ((TREE_CODE (lowval) == INTEGER_CST)
3744 && (TREE_CODE (highval) == INTEGER_CST))
3746 HOST_WIDE_INT highint = TREE_INT_CST_LOW (highval);
3747 HOST_WIDE_INT lowint = TREE_INT_CST_LOW (lowval);
3748 int maxint = (int) (highint - lowint);
3749 return type_hash_canon (maxint < 0 ? ~maxint : maxint, itype);
3755 /* Just like build_index_type, but takes lowval and highval instead
3756 of just highval (maxval). */
3759 build_index_2_type (lowval,highval)
3760 tree lowval, highval;
3762 return build_range_type (NULL_TREE, lowval, highval);
3765 /* Return nonzero iff ITYPE1 and ITYPE2 are equal (in the LISP sense).
3766 Needed because when index types are not hashed, equal index types
3767 built at different times appear distinct, even though structurally,
3771 index_type_equal (itype1, itype2)
3772 tree itype1, itype2;
3774 if (TREE_CODE (itype1) != TREE_CODE (itype2))
3776 if (TREE_CODE (itype1) == INTEGER_TYPE)
3778 if (TYPE_PRECISION (itype1) != TYPE_PRECISION (itype2)
3779 || TYPE_MODE (itype1) != TYPE_MODE (itype2)
3780 || simple_cst_equal (TYPE_SIZE (itype1), TYPE_SIZE (itype2)) != 1
3781 || TYPE_ALIGN (itype1) != TYPE_ALIGN (itype2))
3783 if (1 == simple_cst_equal (TYPE_MIN_VALUE (itype1),
3784 TYPE_MIN_VALUE (itype2))
3785 && 1 == simple_cst_equal (TYPE_MAX_VALUE (itype1),
3786 TYPE_MAX_VALUE (itype2)))
3793 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
3794 and number of elements specified by the range of values of INDEX_TYPE.
3795 If such a type has already been constructed, reuse it. */
3798 build_array_type (elt_type, index_type)
3799 tree elt_type, index_type;
3804 if (TREE_CODE (elt_type) == FUNCTION_TYPE)
3806 error ("arrays of functions are not meaningful");
3807 elt_type = integer_type_node;
3810 /* Make sure TYPE_POINTER_TO (elt_type) is filled in. */
3811 build_pointer_type (elt_type);
3813 /* Allocate the array after the pointer type,
3814 in case we free it in type_hash_canon. */
3815 t = make_node (ARRAY_TYPE);
3816 TREE_TYPE (t) = elt_type;
3817 TYPE_DOMAIN (t) = index_type;
3819 if (index_type == 0)
3824 hashcode = TYPE_HASH (elt_type) + TYPE_HASH (index_type);
3825 t = type_hash_canon (hashcode, t);
3827 #if 0 /* This led to crashes, because it could put a temporary node
3828 on the TYPE_NEXT_VARIANT chain of a permanent one. */
3829 /* The main variant of an array type should always
3830 be an array whose element type is the main variant. */
3831 if (elt_type != TYPE_MAIN_VARIANT (elt_type))
3832 change_main_variant (t, build_array_type (TYPE_MAIN_VARIANT (elt_type),
3836 if (TYPE_SIZE (t) == 0)
3841 /* Construct, lay out and return
3842 the type of functions returning type VALUE_TYPE
3843 given arguments of types ARG_TYPES.
3844 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
3845 are data type nodes for the arguments of the function.
3846 If such a type has already been constructed, reuse it. */
3849 build_function_type (value_type, arg_types)
3850 tree value_type, arg_types;
3855 if (TREE_CODE (value_type) == FUNCTION_TYPE)
3857 error ("function return type cannot be function");
3858 value_type = integer_type_node;
3861 /* Make a node of the sort we want. */
3862 t = make_node (FUNCTION_TYPE);
3863 TREE_TYPE (t) = value_type;
3864 TYPE_ARG_TYPES (t) = arg_types;
3866 /* If we already have such a type, use the old one and free this one. */
3867 hashcode = TYPE_HASH (value_type) + type_hash_list (arg_types);
3868 t = type_hash_canon (hashcode, t);
3870 if (TYPE_SIZE (t) == 0)
3875 /* Build the node for the type of references-to-TO_TYPE. */
3878 build_reference_type (to_type)
3881 register tree t = TYPE_REFERENCE_TO (to_type);
3882 register struct obstack *ambient_obstack = current_obstack;
3883 register struct obstack *ambient_saveable_obstack = saveable_obstack;
3885 /* First, if we already have a type for pointers to TO_TYPE, use it. */
3890 /* We need a new one. If TO_TYPE is permanent, make this permanent too. */
3891 if (TREE_PERMANENT (to_type))
3893 current_obstack = &permanent_obstack;
3894 saveable_obstack = &permanent_obstack;
3897 t = make_node (REFERENCE_TYPE);
3898 TREE_TYPE (t) = to_type;
3900 /* Record this type as the pointer to TO_TYPE. */
3901 TYPE_REFERENCE_TO (to_type) = t;
3905 current_obstack = ambient_obstack;
3906 saveable_obstack = ambient_saveable_obstack;
3910 /* Construct, lay out and return the type of methods belonging to class
3911 BASETYPE and whose arguments and values are described by TYPE.
3912 If that type exists already, reuse it.
3913 TYPE must be a FUNCTION_TYPE node. */
3916 build_method_type (basetype, type)
3917 tree basetype, type;
3922 /* Make a node of the sort we want. */
3923 t = make_node (METHOD_TYPE);
3925 if (TREE_CODE (type) != FUNCTION_TYPE)
3928 TYPE_METHOD_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
3929 TREE_TYPE (t) = TREE_TYPE (type);
3931 /* The actual arglist for this function includes a "hidden" argument
3932 which is "this". Put it into the list of argument types. */
3935 = tree_cons (NULL_TREE,
3936 build_pointer_type (basetype), TYPE_ARG_TYPES (type));
3938 /* If we already have such a type, use the old one and free this one. */
3939 hashcode = TYPE_HASH (basetype) + TYPE_HASH (type);
3940 t = type_hash_canon (hashcode, t);
3942 if (TYPE_SIZE (t) == 0)
3948 /* Construct, lay out and return the type of offsets to a value
3949 of type TYPE, within an object of type BASETYPE.
3950 If a suitable offset type exists already, reuse it. */
3953 build_offset_type (basetype, type)
3954 tree basetype, type;
3959 /* Make a node of the sort we want. */
3960 t = make_node (OFFSET_TYPE);
3962 TYPE_OFFSET_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
3963 TREE_TYPE (t) = type;
3965 /* If we already have such a type, use the old one and free this one. */
3966 hashcode = TYPE_HASH (basetype) + TYPE_HASH (type);
3967 t = type_hash_canon (hashcode, t);
3969 if (TYPE_SIZE (t) == 0)
3975 /* Create a complex type whose components are COMPONENT_TYPE. */
3978 build_complex_type (component_type)
3979 tree component_type;
3984 /* Make a node of the sort we want. */
3985 t = make_node (COMPLEX_TYPE);
3987 TREE_TYPE (t) = TYPE_MAIN_VARIANT (component_type);
3988 TYPE_VOLATILE (t) = TYPE_VOLATILE (component_type);
3989 TYPE_READONLY (t) = TYPE_READONLY (component_type);
3991 /* If we already have such a type, use the old one and free this one. */
3992 hashcode = TYPE_HASH (component_type);
3993 t = type_hash_canon (hashcode, t);
3995 if (TYPE_SIZE (t) == 0)
4001 /* Return OP, stripped of any conversions to wider types as much as is safe.
4002 Converting the value back to OP's type makes a value equivalent to OP.
4004 If FOR_TYPE is nonzero, we return a value which, if converted to
4005 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
4007 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
4008 narrowest type that can hold the value, even if they don't exactly fit.
4009 Otherwise, bit-field references are changed to a narrower type
4010 only if they can be fetched directly from memory in that type.
4012 OP must have integer, real or enumeral type. Pointers are not allowed!
4014 There are some cases where the obvious value we could return
4015 would regenerate to OP if converted to OP's type,
4016 but would not extend like OP to wider types.
4017 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
4018 For example, if OP is (unsigned short)(signed char)-1,
4019 we avoid returning (signed char)-1 if FOR_TYPE is int,
4020 even though extending that to an unsigned short would regenerate OP,
4021 since the result of extending (signed char)-1 to (int)
4022 is different from (int) OP. */
4025 get_unwidened (op, for_type)
4029 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
4030 /* TYPE_PRECISION is safe in place of type_precision since
4031 pointer types are not allowed. */
4032 register tree type = TREE_TYPE (op);
4033 register unsigned final_prec
4034 = TYPE_PRECISION (for_type != 0 ? for_type : type);
4036 = (for_type != 0 && for_type != type
4037 && final_prec > TYPE_PRECISION (type)
4038 && TREE_UNSIGNED (type));
4039 register tree win = op;
4041 while (TREE_CODE (op) == NOP_EXPR)
4043 register int bitschange
4044 = TYPE_PRECISION (TREE_TYPE (op))
4045 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0)));
4047 /* Truncations are many-one so cannot be removed.
4048 Unless we are later going to truncate down even farther. */
4050 && final_prec > TYPE_PRECISION (TREE_TYPE (op)))
4053 /* See what's inside this conversion. If we decide to strip it,
4055 op = TREE_OPERAND (op, 0);
4057 /* If we have not stripped any zero-extensions (uns is 0),
4058 we can strip any kind of extension.
4059 If we have previously stripped a zero-extension,
4060 only zero-extensions can safely be stripped.
4061 Any extension can be stripped if the bits it would produce
4062 are all going to be discarded later by truncating to FOR_TYPE. */
4066 if (! uns || final_prec <= TYPE_PRECISION (TREE_TYPE (op)))
4068 /* TREE_UNSIGNED says whether this is a zero-extension.
4069 Let's avoid computing it if it does not affect WIN
4070 and if UNS will not be needed again. */
4071 if ((uns || TREE_CODE (op) == NOP_EXPR)
4072 && TREE_UNSIGNED (TREE_TYPE (op)))
4080 if (TREE_CODE (op) == COMPONENT_REF
4081 /* Since type_for_size always gives an integer type. */
4082 && TREE_CODE (type) != REAL_TYPE)
4084 unsigned innerprec = TREE_INT_CST_LOW (DECL_SIZE (TREE_OPERAND (op, 1)));
4085 type = type_for_size (innerprec, TREE_UNSIGNED (TREE_OPERAND (op, 1)));
4087 /* We can get this structure field in the narrowest type it fits in.
4088 If FOR_TYPE is 0, do this only for a field that matches the
4089 narrower type exactly and is aligned for it
4090 The resulting extension to its nominal type (a fullword type)
4091 must fit the same conditions as for other extensions. */
4093 if (innerprec < TYPE_PRECISION (TREE_TYPE (op))
4094 && (for_type || ! DECL_BIT_FIELD (TREE_OPERAND (op, 1)))
4095 && (! uns || final_prec <= innerprec
4096 || TREE_UNSIGNED (TREE_OPERAND (op, 1)))
4099 win = build (COMPONENT_REF, type, TREE_OPERAND (op, 0),
4100 TREE_OPERAND (op, 1));
4101 TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op);
4102 TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op);
4103 TREE_RAISES (win) = TREE_RAISES (op);
4109 /* Return OP or a simpler expression for a narrower value
4110 which can be sign-extended or zero-extended to give back OP.
4111 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
4112 or 0 if the value should be sign-extended. */
4115 get_narrower (op, unsignedp_ptr)
4119 register int uns = 0;
4121 register tree win = op;
4123 while (TREE_CODE (op) == NOP_EXPR)
4125 register int bitschange
4126 = TYPE_PRECISION (TREE_TYPE (op))
4127 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0)));
4129 /* Truncations are many-one so cannot be removed. */
4133 /* See what's inside this conversion. If we decide to strip it,
4135 op = TREE_OPERAND (op, 0);
4139 /* An extension: the outermost one can be stripped,
4140 but remember whether it is zero or sign extension. */
4142 uns = TREE_UNSIGNED (TREE_TYPE (op));
4143 /* Otherwise, if a sign extension has been stripped,
4144 only sign extensions can now be stripped;
4145 if a zero extension has been stripped, only zero-extensions. */
4146 else if (uns != TREE_UNSIGNED (TREE_TYPE (op)))
4150 else /* bitschange == 0 */
4152 /* A change in nominal type can always be stripped, but we must
4153 preserve the unsignedness. */
4155 uns = TREE_UNSIGNED (TREE_TYPE (op));
4162 if (TREE_CODE (op) == COMPONENT_REF
4163 /* Since type_for_size always gives an integer type. */
4164 && TREE_CODE (TREE_TYPE (op)) != REAL_TYPE)
4166 unsigned innerprec = TREE_INT_CST_LOW (DECL_SIZE (TREE_OPERAND (op, 1)));
4167 tree type = type_for_size (innerprec, TREE_UNSIGNED (op));
4169 /* We can get this structure field in a narrower type that fits it,
4170 but the resulting extension to its nominal type (a fullword type)
4171 must satisfy the same conditions as for other extensions.
4173 Do this only for fields that are aligned (not bit-fields),
4174 because when bit-field insns will be used there is no
4175 advantage in doing this. */
4177 if (innerprec < TYPE_PRECISION (TREE_TYPE (op))
4178 && ! DECL_BIT_FIELD (TREE_OPERAND (op, 1))
4179 && (first || uns == TREE_UNSIGNED (TREE_OPERAND (op, 1)))
4183 uns = TREE_UNSIGNED (TREE_OPERAND (op, 1));
4184 win = build (COMPONENT_REF, type, TREE_OPERAND (op, 0),
4185 TREE_OPERAND (op, 1));
4186 TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op);
4187 TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op);
4188 TREE_RAISES (win) = TREE_RAISES (op);
4191 *unsignedp_ptr = uns;
4195 /* Return the precision of a type, for arithmetic purposes.
4196 Supports all types on which arithmetic is possible
4197 (including pointer types).
4198 It's not clear yet what will be right for complex types. */
4201 type_precision (type)
4204 return ((TREE_CODE (type) == INTEGER_TYPE
4205 || TREE_CODE (type) == ENUMERAL_TYPE
4206 || TREE_CODE (type) == REAL_TYPE)
4207 ? TYPE_PRECISION (type) : POINTER_SIZE);
4210 /* Nonzero if integer constant C has a value that is permissible
4211 for type TYPE (an INTEGER_TYPE). */
4214 int_fits_type_p (c, type)
4217 if (TREE_UNSIGNED (type))
4218 return (! (TREE_CODE (TYPE_MAX_VALUE (type)) == INTEGER_CST
4219 && INT_CST_LT_UNSIGNED (TYPE_MAX_VALUE (type), c))
4220 && ! (TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST
4221 && INT_CST_LT_UNSIGNED (c, TYPE_MIN_VALUE (type))));
4223 return (! (TREE_CODE (TYPE_MAX_VALUE (type)) == INTEGER_CST
4224 && INT_CST_LT (TYPE_MAX_VALUE (type), c))
4225 && ! (TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST
4226 && INT_CST_LT (c, TYPE_MIN_VALUE (type))));
4229 /* Return the innermost context enclosing DECL that is
4230 a FUNCTION_DECL, or zero if none. */
4233 decl_function_context (decl)
4238 if (TREE_CODE (decl) == ERROR_MARK)
4241 if (TREE_CODE (decl) == SAVE_EXPR)
4242 context = SAVE_EXPR_CONTEXT (decl);
4244 context = DECL_CONTEXT (decl);
4246 while (context && TREE_CODE (context) != FUNCTION_DECL)
4248 if (TREE_CODE (context) == RECORD_TYPE
4249 || TREE_CODE (context) == UNION_TYPE)
4250 context = TYPE_CONTEXT (context);
4251 else if (TREE_CODE (context) == TYPE_DECL)
4252 context = DECL_CONTEXT (context);
4253 else if (TREE_CODE (context) == BLOCK)
4254 context = BLOCK_SUPERCONTEXT (context);
4256 /* Unhandled CONTEXT !? */
4263 /* Return the innermost context enclosing DECL that is
4264 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
4265 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
4268 decl_type_context (decl)
4271 tree context = DECL_CONTEXT (decl);
4275 if (TREE_CODE (context) == RECORD_TYPE
4276 || TREE_CODE (context) == UNION_TYPE
4277 || TREE_CODE (context) == QUAL_UNION_TYPE)
4279 if (TREE_CODE (context) == TYPE_DECL
4280 || TREE_CODE (context) == FUNCTION_DECL)
4281 context = DECL_CONTEXT (context);
4282 else if (TREE_CODE (context) == BLOCK)
4283 context = BLOCK_SUPERCONTEXT (context);
4285 /* Unhandled CONTEXT!? */
4292 print_obstack_statistics (str, o)
4296 struct _obstack_chunk *chunk = o->chunk;
4303 n_alloc += chunk->limit - &chunk->contents[0];
4304 chunk = chunk->prev;
4306 fprintf (stderr, "obstack %s: %d bytes, %d chunks\n",
4307 str, n_alloc, n_chunks);
4310 dump_tree_statistics ()
4313 int total_nodes, total_bytes;
4315 fprintf (stderr, "\n??? tree nodes created\n\n");
4316 #ifdef GATHER_STATISTICS
4317 fprintf (stderr, "Kind Nodes Bytes\n");
4318 fprintf (stderr, "-------------------------------------\n");
4319 total_nodes = total_bytes = 0;
4320 for (i = 0; i < (int) all_kinds; i++)
4322 fprintf (stderr, "%-20s %6d %9d\n", tree_node_kind_names[i],
4323 tree_node_counts[i], tree_node_sizes[i]);
4324 total_nodes += tree_node_counts[i];
4325 total_bytes += tree_node_sizes[i];
4327 fprintf (stderr, "%-20s %9d\n", "identifier names", id_string_size);
4328 fprintf (stderr, "-------------------------------------\n");
4329 fprintf (stderr, "%-20s %6d %9d\n", "Total", total_nodes, total_bytes);
4330 fprintf (stderr, "-------------------------------------\n");
4332 fprintf (stderr, "(No per-node statistics)\n");
4334 print_lang_statistics ();
4337 #define FILE_FUNCTION_PREFIX_LEN 9
4339 #ifndef NO_DOLLAR_IN_LABEL
4340 #define FILE_FUNCTION_FORMAT "_GLOBAL_$D$%s"
4341 #else /* NO_DOLLAR_IN_LABEL */
4342 #ifndef NO_DOT_IN_LABEL
4343 #define FILE_FUNCTION_FORMAT "_GLOBAL_.D.%s"
4344 #else /* NO_DOT_IN_LABEL */
4345 #define FILE_FUNCTION_FORMAT "_GLOBAL__D_%s"
4346 #endif /* NO_DOT_IN_LABEL */
4347 #endif /* NO_DOLLAR_IN_LABEL */
4349 extern char * first_global_object_name;
4351 /* If KIND=='I', return a suitable global initializer (constructor) name.
4352 If KIND=='D', return a suitable global clean-up (destructor) name. */
4355 get_file_function_name (kind)
4361 if (first_global_object_name)
4362 p = first_global_object_name;
4363 else if (main_input_filename)
4364 p = main_input_filename;
4368 buf = (char *) alloca (sizeof (FILE_FUNCTION_FORMAT) + strlen (p));
4370 /* Set up the name of the file-level functions we may need. */
4371 /* Use a global object (which is already required to be unique over
4372 the program) rather than the file name (which imposes extra
4373 constraints). -- Raeburn@MIT.EDU, 10 Jan 1990. */
4374 sprintf (buf, FILE_FUNCTION_FORMAT, p);
4376 /* Don't need to pull weird characters out of global names. */
4377 if (p != first_global_object_name)
4379 for (p = buf+11; *p; p++)
4380 if (! ((*p >= '0' && *p <= '9')
4381 #if 0 /* we always want labels, which are valid C++ identifiers (+ `$') */
4382 #ifndef ASM_IDENTIFY_GCC /* this is required if `.' is invalid -- k. raeburn */
4386 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
4389 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
4392 || (*p >= 'A' && *p <= 'Z')
4393 || (*p >= 'a' && *p <= 'z')))
4397 buf[FILE_FUNCTION_PREFIX_LEN] = kind;
4399 return get_identifier (buf);
4402 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
4403 The result is placed in BUFFER (which has length BIT_SIZE),
4404 with one bit in each char ('\000' or '\001').
4406 If the constructor is constant, NULL_TREE is returned.
4407 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
4410 get_set_constructor_bits (init, buffer, bit_size)
4417 HOST_WIDE_INT domain_min
4418 = TREE_INT_CST_LOW (TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (init))));
4419 tree non_const_bits = NULL_TREE;
4420 for (i = 0; i < bit_size; i++)
4423 for (vals = TREE_OPERAND (init, 1);
4424 vals != NULL_TREE; vals = TREE_CHAIN (vals))
4426 if (TREE_CODE (TREE_VALUE (vals)) != INTEGER_CST
4427 || (TREE_PURPOSE (vals) != NULL_TREE
4428 && TREE_CODE (TREE_PURPOSE (vals)) != INTEGER_CST))
4430 tree_cons (TREE_PURPOSE (vals), TREE_VALUE (vals), non_const_bits);
4431 else if (TREE_PURPOSE (vals) != NULL_TREE)
4433 /* Set a range of bits to ones. */
4434 HOST_WIDE_INT lo_index
4435 = TREE_INT_CST_LOW (TREE_PURPOSE (vals)) - domain_min;
4436 HOST_WIDE_INT hi_index
4437 = TREE_INT_CST_LOW (TREE_VALUE (vals)) - domain_min;
4438 if (lo_index < 0 || lo_index >= bit_size
4439 || hi_index < 0 || hi_index >= bit_size)
4441 for ( ; lo_index <= hi_index; lo_index++)
4442 buffer[lo_index] = 1;
4446 /* Set a single bit to one. */
4448 = TREE_INT_CST_LOW (TREE_VALUE (vals)) - domain_min;
4449 if (index < 0 || index >= bit_size)
4451 error ("invalid initializer for bit string");
4457 return non_const_bits;
4460 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
4461 The result is placed in BUFFER (which is an array of bytes).
4462 If the constructor is constant, NULL_TREE is returned.
4463 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
4466 get_set_constructor_bytes (init, buffer, wd_size)
4468 unsigned char *buffer;
4472 tree vals = TREE_OPERAND (init, 1);
4473 int set_word_size = BITS_PER_UNIT;
4474 int bit_size = wd_size * set_word_size;
4476 unsigned char *bytep = buffer;
4477 char *bit_buffer = (char*)alloca(bit_size);
4478 tree non_const_bits = get_set_constructor_bits (init, bit_buffer, bit_size);
4480 for (i = 0; i < wd_size; i++)
4483 for (i = 0; i < bit_size; i++)
4487 if (BYTES_BIG_ENDIAN)
4488 *bytep |= (1 << (set_word_size - 1 - bit_pos));
4490 *bytep |= 1 << bit_pos;
4493 if (bit_pos >= set_word_size)
4494 bit_pos = 0, bytep++;
4496 return non_const_bits;