1 /* Language-independent node constructors for parse phase of GNU compiler.
2 Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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. */
34 #include "coretypes.h"
47 #include "langhooks.h"
49 /* obstack.[ch] explicitly declined to prototype this. */
50 extern int _obstack_allocated_p (struct obstack *h, void *obj);
52 #ifdef GATHER_STATISTICS
53 /* Statistics-gathering stuff. */
55 int tree_node_counts[(int) all_kinds];
56 int tree_node_sizes[(int) all_kinds];
58 /* Keep in sync with tree.h:enum tree_node_kind. */
59 static const char * const tree_node_kind_names[] = {
75 #endif /* GATHER_STATISTICS */
77 /* Unique id for next decl created. */
78 static GTY(()) int next_decl_uid;
79 /* Unique id for next type created. */
80 static GTY(()) int next_type_uid = 1;
82 /* Since we cannot rehash a type after it is in the table, we have to
83 keep the hash code. */
85 struct type_hash GTY(())
91 /* Initial size of the hash table (rounded to next prime). */
92 #define TYPE_HASH_INITIAL_SIZE 1000
94 /* Now here is the hash table. When recording a type, it is added to
95 the slot whose index is the hash code. Note that the hash table is
96 used for several kinds of types (function types, array types and
97 array index range types, for now). While all these live in the
98 same table, they are completely independent, and the hash code is
99 computed differently for each of these. */
101 static GTY ((if_marked ("type_hash_marked_p"), param_is (struct type_hash)))
102 htab_t type_hash_table;
104 static void set_type_quals (tree, int);
105 static int type_hash_eq (const void *, const void *);
106 static hashval_t type_hash_hash (const void *);
107 static void print_type_hash_statistics (void);
108 static void finish_vector_type (tree);
109 static tree make_vector (enum machine_mode, tree, int);
110 static int type_hash_marked_p (const void *);
112 tree global_trees[TI_MAX];
113 tree integer_types[itk_none];
120 /* Initialize the hash table of types. */
121 type_hash_table = htab_create_ggc (TYPE_HASH_INITIAL_SIZE, type_hash_hash,
126 /* The name of the object as the assembler will see it (but before any
127 translations made by ASM_OUTPUT_LABELREF). Often this is the same
128 as DECL_NAME. It is an IDENTIFIER_NODE. */
130 decl_assembler_name (tree decl)
132 if (!DECL_ASSEMBLER_NAME_SET_P (decl))
133 (*lang_hooks.set_decl_assembler_name) (decl);
134 return DECL_CHECK (decl)->decl.assembler_name;
137 /* Compute the number of bytes occupied by 'node'. This routine only
138 looks at TREE_CODE and, if the code is TREE_VEC, TREE_VEC_LENGTH. */
140 tree_size (tree node)
142 enum tree_code code = TREE_CODE (node);
144 switch (TREE_CODE_CLASS (code))
146 case 'd': /* A decl node */
147 return sizeof (struct tree_decl);
149 case 't': /* a type node */
150 return sizeof (struct tree_type);
152 case 'b': /* a lexical block node */
153 return sizeof (struct tree_block);
155 case 'r': /* a reference */
156 case 'e': /* an expression */
157 case 's': /* an expression with side effects */
158 case '<': /* a comparison expression */
159 case '1': /* a unary arithmetic expression */
160 case '2': /* a binary arithmetic expression */
161 return (sizeof (struct tree_exp)
162 + TREE_CODE_LENGTH (code) * sizeof (char *) - sizeof (char *));
164 case 'c': /* a constant */
167 case INTEGER_CST: return sizeof (struct tree_int_cst);
168 case REAL_CST: return sizeof (struct tree_real_cst);
169 case COMPLEX_CST: return sizeof (struct tree_complex);
170 case VECTOR_CST: return sizeof (struct tree_vector);
171 case STRING_CST: return sizeof (struct tree_string);
173 return (*lang_hooks.tree_size) (code);
176 case 'x': /* something random, like an identifier. */
179 case IDENTIFIER_NODE: return lang_hooks.identifier_size;
180 case TREE_LIST: return sizeof (struct tree_list);
181 case TREE_VEC: return (sizeof (struct tree_vec)
182 + TREE_VEC_LENGTH(node) * sizeof(char *)
186 case PLACEHOLDER_EXPR: return sizeof (struct tree_common);
189 return (*lang_hooks.tree_size) (code);
197 /* Return a newly allocated node of code CODE.
198 For decl and type nodes, some other fields are initialized.
199 The rest of the node is initialized to zero.
201 Achoo! I got a code in the node. */
204 make_node (enum tree_code code)
207 int type = TREE_CODE_CLASS (code);
209 #ifdef GATHER_STATISTICS
212 struct tree_common ttmp;
214 /* We can't allocate a TREE_VEC without knowing how many elements
216 if (code == TREE_VEC)
219 TREE_SET_CODE ((tree)&ttmp, code);
220 length = tree_size ((tree)&ttmp);
222 #ifdef GATHER_STATISTICS
225 case 'd': /* A decl node */
229 case 't': /* a type node */
233 case 'b': /* a lexical block */
237 case 's': /* an expression with side effects */
241 case 'r': /* a reference */
245 case 'e': /* an expression */
246 case '<': /* a comparison expression */
247 case '1': /* a unary arithmetic expression */
248 case '2': /* a binary arithmetic expression */
252 case 'c': /* a constant */
256 case 'x': /* something random, like an identifier. */
257 if (code == IDENTIFIER_NODE)
259 else if (code == TREE_VEC)
269 tree_node_counts[(int) kind]++;
270 tree_node_sizes[(int) kind] += length;
273 t = ggc_alloc_tree (length);
275 memset (t, 0, length);
277 TREE_SET_CODE (t, code);
282 TREE_SIDE_EFFECTS (t) = 1;
286 if (code != FUNCTION_DECL)
288 DECL_USER_ALIGN (t) = 0;
289 DECL_IN_SYSTEM_HEADER (t) = in_system_header;
290 DECL_SOURCE_LOCATION (t) = input_location;
291 DECL_UID (t) = next_decl_uid++;
293 /* We have not yet computed the alias set for this declaration. */
294 DECL_POINTER_ALIAS_SET (t) = -1;
298 TYPE_UID (t) = next_type_uid++;
299 TYPE_ALIGN (t) = char_type_node ? TYPE_ALIGN (char_type_node) : 0;
300 TYPE_USER_ALIGN (t) = 0;
301 TYPE_MAIN_VARIANT (t) = t;
303 /* Default to no attributes for type, but let target change that. */
304 TYPE_ATTRIBUTES (t) = NULL_TREE;
305 (*targetm.set_default_type_attributes) (t);
307 /* We have not yet computed the alias set for this type. */
308 TYPE_ALIAS_SET (t) = -1;
312 TREE_CONSTANT (t) = 1;
322 case PREDECREMENT_EXPR:
323 case PREINCREMENT_EXPR:
324 case POSTDECREMENT_EXPR:
325 case POSTINCREMENT_EXPR:
326 /* All of these have side-effects, no matter what their
328 TREE_SIDE_EFFECTS (t) = 1;
340 /* Return a new node with the same contents as NODE except that its
341 TREE_CHAIN is zero and it has a fresh uid. */
344 copy_node (tree node)
347 enum tree_code code = TREE_CODE (node);
350 length = tree_size (node);
351 t = ggc_alloc_tree (length);
352 memcpy (t, node, length);
355 TREE_ASM_WRITTEN (t) = 0;
357 if (TREE_CODE_CLASS (code) == 'd')
358 DECL_UID (t) = next_decl_uid++;
359 else if (TREE_CODE_CLASS (code) == 't')
361 TYPE_UID (t) = next_type_uid++;
362 /* The following is so that the debug code for
363 the copy is different from the original type.
364 The two statements usually duplicate each other
365 (because they clear fields of the same union),
366 but the optimizer should catch that. */
367 TYPE_SYMTAB_POINTER (t) = 0;
368 TYPE_SYMTAB_ADDRESS (t) = 0;
374 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
375 For example, this can copy a list made of TREE_LIST nodes. */
378 copy_list (tree list)
386 head = prev = copy_node (list);
387 next = TREE_CHAIN (list);
390 TREE_CHAIN (prev) = copy_node (next);
391 prev = TREE_CHAIN (prev);
392 next = TREE_CHAIN (next);
398 /* Return a newly constructed INTEGER_CST node whose constant value
399 is specified by the two ints LOW and HI.
400 The TREE_TYPE is set to `int'.
402 This function should be used via the `build_int_2' macro. */
405 build_int_2_wide (unsigned HOST_WIDE_INT low, HOST_WIDE_INT hi)
407 tree t = make_node (INTEGER_CST);
409 TREE_INT_CST_LOW (t) = low;
410 TREE_INT_CST_HIGH (t) = hi;
411 TREE_TYPE (t) = integer_type_node;
415 /* Return a new VECTOR_CST node whose type is TYPE and whose values
416 are in a list pointed by VALS. */
419 build_vector (tree type, tree vals)
421 tree v = make_node (VECTOR_CST);
422 int over1 = 0, over2 = 0;
425 TREE_VECTOR_CST_ELTS (v) = vals;
426 TREE_TYPE (v) = type;
428 /* Iterate through elements and check for overflow. */
429 for (link = vals; link; link = TREE_CHAIN (link))
431 tree value = TREE_VALUE (link);
433 over1 |= TREE_OVERFLOW (value);
434 over2 |= TREE_CONSTANT_OVERFLOW (value);
437 TREE_OVERFLOW (v) = over1;
438 TREE_CONSTANT_OVERFLOW (v) = over2;
443 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
444 are in a list pointed to by VALS. */
446 build_constructor (tree type, tree vals)
448 tree c = make_node (CONSTRUCTOR);
449 TREE_TYPE (c) = type;
450 CONSTRUCTOR_ELTS (c) = vals;
452 /* ??? May not be necessary. Mirrors what build does. */
455 TREE_SIDE_EFFECTS (c) = TREE_SIDE_EFFECTS (vals);
456 TREE_READONLY (c) = TREE_READONLY (vals);
457 TREE_CONSTANT (c) = TREE_CONSTANT (vals);
460 TREE_CONSTANT (c) = 0; /* safe side */
465 /* Return a new REAL_CST node whose type is TYPE and value is D. */
468 build_real (tree type, REAL_VALUE_TYPE d)
474 /* ??? Used to check for overflow here via CHECK_FLOAT_TYPE.
475 Consider doing it via real_convert now. */
477 v = make_node (REAL_CST);
478 dp = ggc_alloc (sizeof (REAL_VALUE_TYPE));
479 memcpy (dp, &d, sizeof (REAL_VALUE_TYPE));
481 TREE_TYPE (v) = type;
482 TREE_REAL_CST_PTR (v) = dp;
483 TREE_OVERFLOW (v) = TREE_CONSTANT_OVERFLOW (v) = overflow;
487 /* Return a new REAL_CST node whose type is TYPE
488 and whose value is the integer value of the INTEGER_CST node I. */
491 real_value_from_int_cst (tree type, tree i)
495 /* Clear all bits of the real value type so that we can later do
496 bitwise comparisons to see if two values are the same. */
497 memset (&d, 0, sizeof d);
499 real_from_integer (&d, type ? TYPE_MODE (type) : VOIDmode,
500 TREE_INT_CST_LOW (i), TREE_INT_CST_HIGH (i),
501 TREE_UNSIGNED (TREE_TYPE (i)));
505 /* Given a tree representing an integer constant I, return a tree
506 representing the same value as a floating-point constant of type TYPE. */
509 build_real_from_int_cst (tree type, tree i)
512 int overflow = TREE_OVERFLOW (i);
514 v = build_real (type, real_value_from_int_cst (type, i));
516 TREE_OVERFLOW (v) |= overflow;
517 TREE_CONSTANT_OVERFLOW (v) |= overflow;
521 /* Return a newly constructed STRING_CST node whose value is
522 the LEN characters at STR.
523 The TREE_TYPE is not initialized. */
526 build_string (int len, const char *str)
528 tree s = make_node (STRING_CST);
530 TREE_STRING_LENGTH (s) = len;
531 TREE_STRING_POINTER (s) = ggc_alloc_string (str, len);
536 /* Return a newly constructed COMPLEX_CST node whose value is
537 specified by the real and imaginary parts REAL and IMAG.
538 Both REAL and IMAG should be constant nodes. TYPE, if specified,
539 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
542 build_complex (tree type, tree real, tree imag)
544 tree t = make_node (COMPLEX_CST);
546 TREE_REALPART (t) = real;
547 TREE_IMAGPART (t) = imag;
548 TREE_TYPE (t) = type ? type : build_complex_type (TREE_TYPE (real));
549 TREE_OVERFLOW (t) = TREE_OVERFLOW (real) | TREE_OVERFLOW (imag);
550 TREE_CONSTANT_OVERFLOW (t)
551 = TREE_CONSTANT_OVERFLOW (real) | TREE_CONSTANT_OVERFLOW (imag);
555 /* Build a newly constructed TREE_VEC node of length LEN. */
558 make_tree_vec (int len)
561 int length = (len - 1) * sizeof (tree) + sizeof (struct tree_vec);
563 #ifdef GATHER_STATISTICS
564 tree_node_counts[(int) vec_kind]++;
565 tree_node_sizes[(int) vec_kind] += length;
568 t = ggc_alloc_tree (length);
570 memset (t, 0, length);
571 TREE_SET_CODE (t, TREE_VEC);
572 TREE_VEC_LENGTH (t) = len;
577 /* Return 1 if EXPR is the integer constant zero or a complex constant
581 integer_zerop (tree expr)
585 return ((TREE_CODE (expr) == INTEGER_CST
586 && ! TREE_CONSTANT_OVERFLOW (expr)
587 && TREE_INT_CST_LOW (expr) == 0
588 && TREE_INT_CST_HIGH (expr) == 0)
589 || (TREE_CODE (expr) == COMPLEX_CST
590 && integer_zerop (TREE_REALPART (expr))
591 && integer_zerop (TREE_IMAGPART (expr))));
594 /* Return 1 if EXPR is the integer constant one or the corresponding
598 integer_onep (tree expr)
602 return ((TREE_CODE (expr) == INTEGER_CST
603 && ! TREE_CONSTANT_OVERFLOW (expr)
604 && TREE_INT_CST_LOW (expr) == 1
605 && TREE_INT_CST_HIGH (expr) == 0)
606 || (TREE_CODE (expr) == COMPLEX_CST
607 && integer_onep (TREE_REALPART (expr))
608 && integer_zerop (TREE_IMAGPART (expr))));
611 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
612 it contains. Likewise for the corresponding complex constant. */
615 integer_all_onesp (tree expr)
622 if (TREE_CODE (expr) == COMPLEX_CST
623 && integer_all_onesp (TREE_REALPART (expr))
624 && integer_zerop (TREE_IMAGPART (expr)))
627 else if (TREE_CODE (expr) != INTEGER_CST
628 || TREE_CONSTANT_OVERFLOW (expr))
631 uns = TREE_UNSIGNED (TREE_TYPE (expr));
633 return (TREE_INT_CST_LOW (expr) == ~(unsigned HOST_WIDE_INT) 0
634 && TREE_INT_CST_HIGH (expr) == -1);
636 /* Note that using TYPE_PRECISION here is wrong. We care about the
637 actual bits, not the (arbitrary) range of the type. */
638 prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr)));
639 if (prec >= HOST_BITS_PER_WIDE_INT)
641 HOST_WIDE_INT high_value;
644 shift_amount = prec - HOST_BITS_PER_WIDE_INT;
646 if (shift_amount > HOST_BITS_PER_WIDE_INT)
647 /* Can not handle precisions greater than twice the host int size. */
649 else if (shift_amount == HOST_BITS_PER_WIDE_INT)
650 /* Shifting by the host word size is undefined according to the ANSI
651 standard, so we must handle this as a special case. */
654 high_value = ((HOST_WIDE_INT) 1 << shift_amount) - 1;
656 return (TREE_INT_CST_LOW (expr) == ~(unsigned HOST_WIDE_INT) 0
657 && TREE_INT_CST_HIGH (expr) == high_value);
660 return TREE_INT_CST_LOW (expr) == ((unsigned HOST_WIDE_INT) 1 << prec) - 1;
663 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
667 integer_pow2p (tree expr)
670 HOST_WIDE_INT high, low;
674 if (TREE_CODE (expr) == COMPLEX_CST
675 && integer_pow2p (TREE_REALPART (expr))
676 && integer_zerop (TREE_IMAGPART (expr)))
679 if (TREE_CODE (expr) != INTEGER_CST || TREE_CONSTANT_OVERFLOW (expr))
682 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
683 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
684 high = TREE_INT_CST_HIGH (expr);
685 low = TREE_INT_CST_LOW (expr);
687 /* First clear all bits that are beyond the type's precision in case
688 we've been sign extended. */
690 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
692 else if (prec > HOST_BITS_PER_WIDE_INT)
693 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
697 if (prec < HOST_BITS_PER_WIDE_INT)
698 low &= ~((HOST_WIDE_INT) (-1) << prec);
701 if (high == 0 && low == 0)
704 return ((high == 0 && (low & (low - 1)) == 0)
705 || (low == 0 && (high & (high - 1)) == 0));
708 /* Return 1 if EXPR is an integer constant other than zero or a
709 complex constant other than zero. */
712 integer_nonzerop (tree expr)
716 return ((TREE_CODE (expr) == INTEGER_CST
717 && ! TREE_CONSTANT_OVERFLOW (expr)
718 && (TREE_INT_CST_LOW (expr) != 0
719 || TREE_INT_CST_HIGH (expr) != 0))
720 || (TREE_CODE (expr) == COMPLEX_CST
721 && (integer_nonzerop (TREE_REALPART (expr))
722 || integer_nonzerop (TREE_IMAGPART (expr)))));
725 /* Return the power of two represented by a tree node known to be a
729 tree_log2 (tree expr)
732 HOST_WIDE_INT high, low;
736 if (TREE_CODE (expr) == COMPLEX_CST)
737 return tree_log2 (TREE_REALPART (expr));
739 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
740 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
742 high = TREE_INT_CST_HIGH (expr);
743 low = TREE_INT_CST_LOW (expr);
745 /* First clear all bits that are beyond the type's precision in case
746 we've been sign extended. */
748 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
750 else if (prec > HOST_BITS_PER_WIDE_INT)
751 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
755 if (prec < HOST_BITS_PER_WIDE_INT)
756 low &= ~((HOST_WIDE_INT) (-1) << prec);
759 return (high != 0 ? HOST_BITS_PER_WIDE_INT + exact_log2 (high)
763 /* Similar, but return the largest integer Y such that 2 ** Y is less
764 than or equal to EXPR. */
767 tree_floor_log2 (tree expr)
770 HOST_WIDE_INT high, low;
774 if (TREE_CODE (expr) == COMPLEX_CST)
775 return tree_log2 (TREE_REALPART (expr));
777 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
778 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
780 high = TREE_INT_CST_HIGH (expr);
781 low = TREE_INT_CST_LOW (expr);
783 /* First clear all bits that are beyond the type's precision in case
784 we've been sign extended. Ignore if type's precision hasn't been set
785 since what we are doing is setting it. */
787 if (prec == 2 * HOST_BITS_PER_WIDE_INT || prec == 0)
789 else if (prec > HOST_BITS_PER_WIDE_INT)
790 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
794 if (prec < HOST_BITS_PER_WIDE_INT)
795 low &= ~((HOST_WIDE_INT) (-1) << prec);
798 return (high != 0 ? HOST_BITS_PER_WIDE_INT + floor_log2 (high)
802 /* Return 1 if EXPR is the real constant zero. */
805 real_zerop (tree expr)
809 return ((TREE_CODE (expr) == REAL_CST
810 && ! TREE_CONSTANT_OVERFLOW (expr)
811 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst0))
812 || (TREE_CODE (expr) == COMPLEX_CST
813 && real_zerop (TREE_REALPART (expr))
814 && real_zerop (TREE_IMAGPART (expr))));
817 /* Return 1 if EXPR is the real constant one in real or complex form. */
820 real_onep (tree expr)
824 return ((TREE_CODE (expr) == REAL_CST
825 && ! TREE_CONSTANT_OVERFLOW (expr)
826 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst1))
827 || (TREE_CODE (expr) == COMPLEX_CST
828 && real_onep (TREE_REALPART (expr))
829 && real_zerop (TREE_IMAGPART (expr))));
832 /* Return 1 if EXPR is the real constant two. */
835 real_twop (tree expr)
839 return ((TREE_CODE (expr) == REAL_CST
840 && ! TREE_CONSTANT_OVERFLOW (expr)
841 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst2))
842 || (TREE_CODE (expr) == COMPLEX_CST
843 && real_twop (TREE_REALPART (expr))
844 && real_zerop (TREE_IMAGPART (expr))));
847 /* Return 1 if EXPR is the real constant minus one. */
850 real_minus_onep (tree expr)
854 return ((TREE_CODE (expr) == REAL_CST
855 && ! TREE_CONSTANT_OVERFLOW (expr)
856 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconstm1))
857 || (TREE_CODE (expr) == COMPLEX_CST
858 && real_minus_onep (TREE_REALPART (expr))
859 && real_zerop (TREE_IMAGPART (expr))));
862 /* Nonzero if EXP is a constant or a cast of a constant. */
865 really_constant_p (tree exp)
867 /* This is not quite the same as STRIP_NOPS. It does more. */
868 while (TREE_CODE (exp) == NOP_EXPR
869 || TREE_CODE (exp) == CONVERT_EXPR
870 || TREE_CODE (exp) == NON_LVALUE_EXPR)
871 exp = TREE_OPERAND (exp, 0);
872 return TREE_CONSTANT (exp);
875 /* Return first list element whose TREE_VALUE is ELEM.
876 Return 0 if ELEM is not in LIST. */
879 value_member (tree elem, tree list)
883 if (elem == TREE_VALUE (list))
885 list = TREE_CHAIN (list);
890 /* Return first list element whose TREE_PURPOSE is ELEM.
891 Return 0 if ELEM is not in LIST. */
894 purpose_member (tree elem, tree list)
898 if (elem == TREE_PURPOSE (list))
900 list = TREE_CHAIN (list);
905 /* Return first list element whose BINFO_TYPE is ELEM.
906 Return 0 if ELEM is not in LIST. */
909 binfo_member (tree elem, tree list)
913 if (elem == BINFO_TYPE (list))
915 list = TREE_CHAIN (list);
920 /* Return nonzero if ELEM is part of the chain CHAIN. */
923 chain_member (tree elem, tree chain)
929 chain = TREE_CHAIN (chain);
935 /* Return the length of a chain of nodes chained through TREE_CHAIN.
936 We expect a null pointer to mark the end of the chain.
937 This is the Lisp primitive `length'. */
945 for (tail = t; tail; tail = TREE_CHAIN (tail))
951 /* Returns the number of FIELD_DECLs in TYPE. */
954 fields_length (tree type)
956 tree t = TYPE_FIELDS (type);
959 for (; t; t = TREE_CHAIN (t))
960 if (TREE_CODE (t) == FIELD_DECL)
966 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
967 by modifying the last node in chain 1 to point to chain 2.
968 This is the Lisp primitive `nconc'. */
971 chainon (tree op1, tree op2)
980 for (t1 = op1; TREE_CHAIN (t1); t1 = TREE_CHAIN (t1))
982 TREE_CHAIN (t1) = op2;
984 #ifdef ENABLE_TREE_CHECKING
987 for (t2 = op2; t2; t2 = TREE_CHAIN (t2))
989 abort (); /* Circularity created. */
996 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
999 tree_last (tree chain)
1003 while ((next = TREE_CHAIN (chain)))
1008 /* Reverse the order of elements in the chain T,
1009 and return the new head of the chain (old last element). */
1014 tree prev = 0, decl, next;
1015 for (decl = t; decl; decl = next)
1017 next = TREE_CHAIN (decl);
1018 TREE_CHAIN (decl) = prev;
1024 /* Return a newly created TREE_LIST node whose
1025 purpose and value fields are PARM and VALUE. */
1028 build_tree_list (tree parm, tree value)
1030 tree t = make_node (TREE_LIST);
1031 TREE_PURPOSE (t) = parm;
1032 TREE_VALUE (t) = value;
1036 /* Return a newly created TREE_LIST node whose
1037 purpose and value fields are PURPOSE and VALUE
1038 and whose TREE_CHAIN is CHAIN. */
1041 tree_cons (tree purpose, tree value, tree chain)
1045 node = ggc_alloc_tree (sizeof (struct tree_list));
1047 memset (node, 0, sizeof (struct tree_common));
1049 #ifdef GATHER_STATISTICS
1050 tree_node_counts[(int) x_kind]++;
1051 tree_node_sizes[(int) x_kind] += sizeof (struct tree_list);
1054 TREE_SET_CODE (node, TREE_LIST);
1055 TREE_CHAIN (node) = chain;
1056 TREE_PURPOSE (node) = purpose;
1057 TREE_VALUE (node) = value;
1061 /* Return the first expression in a sequence of COMPOUND_EXPRs. */
1064 expr_first (tree expr)
1066 if (expr == NULL_TREE)
1068 while (TREE_CODE (expr) == COMPOUND_EXPR)
1069 expr = TREE_OPERAND (expr, 0);
1073 /* Return the last expression in a sequence of COMPOUND_EXPRs. */
1076 expr_last (tree expr)
1078 if (expr == NULL_TREE)
1080 while (TREE_CODE (expr) == COMPOUND_EXPR)
1081 expr = TREE_OPERAND (expr, 1);
1085 /* Return the number of subexpressions in a sequence of COMPOUND_EXPRs. */
1088 expr_length (tree expr)
1092 if (expr == NULL_TREE)
1094 for (; TREE_CODE (expr) == COMPOUND_EXPR; expr = TREE_OPERAND (expr, 1))
1095 len += expr_length (TREE_OPERAND (expr, 0));
1100 /* Return the size nominally occupied by an object of type TYPE
1101 when it resides in memory. The value is measured in units of bytes,
1102 and its data type is that normally used for type sizes
1103 (which is the first type created by make_signed_type or
1104 make_unsigned_type). */
1107 size_in_bytes (tree type)
1111 if (type == error_mark_node)
1112 return integer_zero_node;
1114 type = TYPE_MAIN_VARIANT (type);
1115 t = TYPE_SIZE_UNIT (type);
1119 (*lang_hooks.types.incomplete_type_error) (NULL_TREE, type);
1120 return size_zero_node;
1123 if (TREE_CODE (t) == INTEGER_CST)
1124 force_fit_type (t, 0);
1129 /* Return the size of TYPE (in bytes) as a wide integer
1130 or return -1 if the size can vary or is larger than an integer. */
1133 int_size_in_bytes (tree type)
1137 if (type == error_mark_node)
1140 type = TYPE_MAIN_VARIANT (type);
1141 t = TYPE_SIZE_UNIT (type);
1143 || TREE_CODE (t) != INTEGER_CST
1144 || TREE_OVERFLOW (t)
1145 || TREE_INT_CST_HIGH (t) != 0
1146 /* If the result would appear negative, it's too big to represent. */
1147 || (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0)
1150 return TREE_INT_CST_LOW (t);
1153 /* Return the bit position of FIELD, in bits from the start of the record.
1154 This is a tree of type bitsizetype. */
1157 bit_position (tree field)
1159 return bit_from_pos (DECL_FIELD_OFFSET (field),
1160 DECL_FIELD_BIT_OFFSET (field));
1163 /* Likewise, but return as an integer. Abort if it cannot be represented
1164 in that way (since it could be a signed value, we don't have the option
1165 of returning -1 like int_size_in_byte can. */
1168 int_bit_position (tree field)
1170 return tree_low_cst (bit_position (field), 0);
1173 /* Return the byte position of FIELD, in bytes from the start of the record.
1174 This is a tree of type sizetype. */
1177 byte_position (tree field)
1179 return byte_from_pos (DECL_FIELD_OFFSET (field),
1180 DECL_FIELD_BIT_OFFSET (field));
1183 /* Likewise, but return as an integer. Abort if it cannot be represented
1184 in that way (since it could be a signed value, we don't have the option
1185 of returning -1 like int_size_in_byte can. */
1188 int_byte_position (tree field)
1190 return tree_low_cst (byte_position (field), 0);
1193 /* Return the strictest alignment, in bits, that T is known to have. */
1198 unsigned int align0, align1;
1200 switch (TREE_CODE (t))
1202 case NOP_EXPR: case CONVERT_EXPR: case NON_LVALUE_EXPR:
1203 /* If we have conversions, we know that the alignment of the
1204 object must meet each of the alignments of the types. */
1205 align0 = expr_align (TREE_OPERAND (t, 0));
1206 align1 = TYPE_ALIGN (TREE_TYPE (t));
1207 return MAX (align0, align1);
1209 case SAVE_EXPR: case COMPOUND_EXPR: case MODIFY_EXPR:
1210 case INIT_EXPR: case TARGET_EXPR: case WITH_CLEANUP_EXPR:
1211 case WITH_RECORD_EXPR: case CLEANUP_POINT_EXPR: case UNSAVE_EXPR:
1212 /* These don't change the alignment of an object. */
1213 return expr_align (TREE_OPERAND (t, 0));
1216 /* The best we can do is say that the alignment is the least aligned
1218 align0 = expr_align (TREE_OPERAND (t, 1));
1219 align1 = expr_align (TREE_OPERAND (t, 2));
1220 return MIN (align0, align1);
1222 case LABEL_DECL: case CONST_DECL:
1223 case VAR_DECL: case PARM_DECL: case RESULT_DECL:
1224 if (DECL_ALIGN (t) != 0)
1225 return DECL_ALIGN (t);
1229 return FUNCTION_BOUNDARY;
1235 /* Otherwise take the alignment from that of the type. */
1236 return TYPE_ALIGN (TREE_TYPE (t));
1239 /* Return, as a tree node, the number of elements for TYPE (which is an
1240 ARRAY_TYPE) minus one. This counts only elements of the top array. */
1243 array_type_nelts (tree type)
1245 tree index_type, min, max;
1247 /* If they did it with unspecified bounds, then we should have already
1248 given an error about it before we got here. */
1249 if (! TYPE_DOMAIN (type))
1250 return error_mark_node;
1252 index_type = TYPE_DOMAIN (type);
1253 min = TYPE_MIN_VALUE (index_type);
1254 max = TYPE_MAX_VALUE (index_type);
1256 return (integer_zerop (min)
1258 : fold (build (MINUS_EXPR, TREE_TYPE (max), max, min)));
1261 /* Return nonzero if arg is static -- a reference to an object in
1262 static storage. This is not the same as the C meaning of `static'. */
1267 switch (TREE_CODE (arg))
1270 /* Nested functions aren't static, since taking their address
1271 involves a trampoline. */
1272 return ((decl_function_context (arg) == 0 || DECL_NO_STATIC_CHAIN (arg))
1273 && ! DECL_NON_ADDR_CONST_P (arg));
1276 return ((TREE_STATIC (arg) || DECL_EXTERNAL (arg))
1277 && ! DECL_THREAD_LOCAL (arg)
1278 && ! DECL_NON_ADDR_CONST_P (arg));
1281 return TREE_STATIC (arg);
1287 /* If we are referencing a bitfield, we can't evaluate an
1288 ADDR_EXPR at compile time and so it isn't a constant. */
1290 return (! DECL_BIT_FIELD (TREE_OPERAND (arg, 1))
1291 && staticp (TREE_OPERAND (arg, 0)));
1297 /* This case is technically correct, but results in setting
1298 TREE_CONSTANT on ADDR_EXPRs that cannot be evaluated at
1301 return TREE_CONSTANT (TREE_OPERAND (arg, 0));
1305 case ARRAY_RANGE_REF:
1306 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg))) == INTEGER_CST
1307 && TREE_CODE (TREE_OPERAND (arg, 1)) == INTEGER_CST)
1308 return staticp (TREE_OPERAND (arg, 0));
1311 if ((unsigned int) TREE_CODE (arg)
1312 >= (unsigned int) LAST_AND_UNUSED_TREE_CODE)
1313 return (*lang_hooks.staticp) (arg);
1319 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
1320 Do this to any expression which may be used in more than one place,
1321 but must be evaluated only once.
1323 Normally, expand_expr would reevaluate the expression each time.
1324 Calling save_expr produces something that is evaluated and recorded
1325 the first time expand_expr is called on it. Subsequent calls to
1326 expand_expr just reuse the recorded value.
1328 The call to expand_expr that generates code that actually computes
1329 the value is the first call *at compile time*. Subsequent calls
1330 *at compile time* generate code to use the saved value.
1331 This produces correct result provided that *at run time* control
1332 always flows through the insns made by the first expand_expr
1333 before reaching the other places where the save_expr was evaluated.
1334 You, the caller of save_expr, must make sure this is so.
1336 Constants, and certain read-only nodes, are returned with no
1337 SAVE_EXPR because that is safe. Expressions containing placeholders
1338 are not touched; see tree.def for an explanation of what these
1342 save_expr (tree expr)
1344 tree t = fold (expr);
1347 /* If the tree evaluates to a constant, then we don't want to hide that
1348 fact (i.e. this allows further folding, and direct checks for constants).
1349 However, a read-only object that has side effects cannot be bypassed.
1350 Since it is no problem to reevaluate literals, we just return the
1352 inner = skip_simple_arithmetic (t);
1353 if (TREE_CONSTANT (inner)
1354 || (TREE_READONLY (inner) && ! TREE_SIDE_EFFECTS (inner))
1355 || TREE_CODE (inner) == SAVE_EXPR
1356 || TREE_CODE (inner) == ERROR_MARK)
1359 /* If INNER contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
1360 it means that the size or offset of some field of an object depends on
1361 the value within another field.
1363 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
1364 and some variable since it would then need to be both evaluated once and
1365 evaluated more than once. Front-ends must assure this case cannot
1366 happen by surrounding any such subexpressions in their own SAVE_EXPR
1367 and forcing evaluation at the proper time. */
1368 if (contains_placeholder_p (inner))
1371 t = build (SAVE_EXPR, TREE_TYPE (expr), t, current_function_decl, NULL_TREE);
1373 /* This expression might be placed ahead of a jump to ensure that the
1374 value was computed on both sides of the jump. So make sure it isn't
1375 eliminated as dead. */
1376 TREE_SIDE_EFFECTS (t) = 1;
1377 TREE_READONLY (t) = 1;
1381 /* Look inside EXPR and into any simple arithmetic operations. Return
1382 the innermost non-arithmetic node. */
1385 skip_simple_arithmetic (tree expr)
1389 /* We don't care about whether this can be used as an lvalue in this
1391 while (TREE_CODE (expr) == NON_LVALUE_EXPR)
1392 expr = TREE_OPERAND (expr, 0);
1394 /* If we have simple operations applied to a SAVE_EXPR or to a SAVE_EXPR and
1395 a constant, it will be more efficient to not make another SAVE_EXPR since
1396 it will allow better simplification and GCSE will be able to merge the
1397 computations if they actually occur. */
1401 if (TREE_CODE_CLASS (TREE_CODE (inner)) == '1')
1402 inner = TREE_OPERAND (inner, 0);
1403 else if (TREE_CODE_CLASS (TREE_CODE (inner)) == '2')
1405 if (TREE_CONSTANT (TREE_OPERAND (inner, 1)))
1406 inner = TREE_OPERAND (inner, 0);
1407 else if (TREE_CONSTANT (TREE_OPERAND (inner, 0)))
1408 inner = TREE_OPERAND (inner, 1);
1419 /* Return TRUE if EXPR is a SAVE_EXPR or wraps simple arithmetic around a
1420 SAVE_EXPR. Return FALSE otherwise. */
1423 saved_expr_p (tree expr)
1425 return TREE_CODE (skip_simple_arithmetic (expr)) == SAVE_EXPR;
1428 /* Arrange for an expression to be expanded multiple independent
1429 times. This is useful for cleanup actions, as the backend can
1430 expand them multiple times in different places. */
1433 unsave_expr (tree expr)
1437 /* If this is already protected, no sense in protecting it again. */
1438 if (TREE_CODE (expr) == UNSAVE_EXPR)
1441 t = build1 (UNSAVE_EXPR, TREE_TYPE (expr), expr);
1442 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (expr);
1446 /* Returns the index of the first non-tree operand for CODE, or the number
1447 of operands if all are trees. */
1450 first_rtl_op (enum tree_code code)
1456 case GOTO_SUBROUTINE_EXPR:
1459 case WITH_CLEANUP_EXPR:
1462 return TREE_CODE_LENGTH (code);
1466 /* Return which tree structure is used by T. */
1468 enum tree_node_structure_enum
1469 tree_node_structure (tree t)
1471 enum tree_code code = TREE_CODE (t);
1473 switch (TREE_CODE_CLASS (code))
1475 case 'd': return TS_DECL;
1476 case 't': return TS_TYPE;
1477 case 'b': return TS_BLOCK;
1478 case 'r': case '<': case '1': case '2': case 'e': case 's':
1480 default: /* 'c' and 'x' */
1486 case INTEGER_CST: return TS_INT_CST;
1487 case REAL_CST: return TS_REAL_CST;
1488 case COMPLEX_CST: return TS_COMPLEX;
1489 case VECTOR_CST: return TS_VECTOR;
1490 case STRING_CST: return TS_STRING;
1492 case ERROR_MARK: return TS_COMMON;
1493 case IDENTIFIER_NODE: return TS_IDENTIFIER;
1494 case TREE_LIST: return TS_LIST;
1495 case TREE_VEC: return TS_VEC;
1496 case PLACEHOLDER_EXPR: return TS_COMMON;
1503 /* Perform any modifications to EXPR required when it is unsaved. Does
1504 not recurse into EXPR's subtrees. */
1507 unsave_expr_1 (tree expr)
1509 switch (TREE_CODE (expr))
1512 if (! SAVE_EXPR_PERSISTENT_P (expr))
1513 SAVE_EXPR_RTL (expr) = 0;
1517 /* Don't mess with a TARGET_EXPR that hasn't been expanded.
1518 It's OK for this to happen if it was part of a subtree that
1519 isn't immediately expanded, such as operand 2 of another
1521 if (TREE_OPERAND (expr, 1))
1524 TREE_OPERAND (expr, 1) = TREE_OPERAND (expr, 3);
1525 TREE_OPERAND (expr, 3) = NULL_TREE;
1529 /* I don't yet know how to emit a sequence multiple times. */
1530 if (RTL_EXPR_SEQUENCE (expr) != 0)
1539 /* Default lang hook for "unsave_expr_now". */
1542 lhd_unsave_expr_now (tree expr)
1544 enum tree_code code;
1546 /* There's nothing to do for NULL_TREE. */
1550 unsave_expr_1 (expr);
1552 code = TREE_CODE (expr);
1553 switch (TREE_CODE_CLASS (code))
1555 case 'c': /* a constant */
1556 case 't': /* a type node */
1557 case 'd': /* A decl node */
1558 case 'b': /* A block node */
1561 case 'x': /* miscellaneous: e.g., identifier, TREE_LIST or ERROR_MARK. */
1562 if (code == TREE_LIST)
1564 lhd_unsave_expr_now (TREE_VALUE (expr));
1565 lhd_unsave_expr_now (TREE_CHAIN (expr));
1569 case 'e': /* an expression */
1570 case 'r': /* a reference */
1571 case 's': /* an expression with side effects */
1572 case '<': /* a comparison expression */
1573 case '2': /* a binary arithmetic expression */
1574 case '1': /* a unary arithmetic expression */
1578 for (i = first_rtl_op (code) - 1; i >= 0; i--)
1579 lhd_unsave_expr_now (TREE_OPERAND (expr, i));
1590 /* Return 0 if it is safe to evaluate EXPR multiple times,
1591 return 1 if it is safe if EXPR is unsaved afterward, or
1592 return 2 if it is completely unsafe.
1594 This assumes that CALL_EXPRs and TARGET_EXPRs are never replicated in
1595 an expression tree, so that it safe to unsave them and the surrounding
1596 context will be correct.
1598 SAVE_EXPRs basically *only* appear replicated in an expression tree,
1599 occasionally across the whole of a function. It is therefore only
1600 safe to unsave a SAVE_EXPR if you know that all occurrences appear
1601 below the UNSAVE_EXPR.
1603 RTL_EXPRs consume their rtl during evaluation. It is therefore
1604 never possible to unsave them. */
1607 unsafe_for_reeval (tree expr)
1610 enum tree_code code;
1615 if (expr == NULL_TREE)
1618 code = TREE_CODE (expr);
1619 first_rtl = first_rtl_op (code);
1628 for (exp = expr; exp != 0; exp = TREE_CHAIN (exp))
1630 tmp = unsafe_for_reeval (TREE_VALUE (exp));
1631 unsafeness = MAX (tmp, unsafeness);
1637 tmp2 = unsafe_for_reeval (TREE_OPERAND (expr, 0));
1638 tmp = unsafe_for_reeval (TREE_OPERAND (expr, 1));
1639 return MAX (MAX (tmp, 1), tmp2);
1645 case EXIT_BLOCK_EXPR:
1646 /* EXIT_BLOCK_LABELED_BLOCK, a.k.a. TREE_OPERAND (expr, 0), holds
1647 a reference to an ancestor LABELED_BLOCK, so we need to avoid
1648 unbounded recursion in the 'e' traversal code below. */
1649 exp = EXIT_BLOCK_RETURN (expr);
1650 return exp ? unsafe_for_reeval (exp) : 0;
1653 tmp = (*lang_hooks.unsafe_for_reeval) (expr);
1659 switch (TREE_CODE_CLASS (code))
1661 case 'c': /* a constant */
1662 case 't': /* a type node */
1663 case 'x': /* something random, like an identifier or an ERROR_MARK. */
1664 case 'd': /* A decl node */
1665 case 'b': /* A block node */
1668 case 'e': /* an expression */
1669 case 'r': /* a reference */
1670 case 's': /* an expression with side effects */
1671 case '<': /* a comparison expression */
1672 case '2': /* a binary arithmetic expression */
1673 case '1': /* a unary arithmetic expression */
1674 for (i = first_rtl - 1; i >= 0; i--)
1676 tmp = unsafe_for_reeval (TREE_OPERAND (expr, i));
1677 unsafeness = MAX (tmp, unsafeness);
1687 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
1688 or offset that depends on a field within a record. */
1691 contains_placeholder_p (tree exp)
1693 enum tree_code code;
1699 /* If we have a WITH_RECORD_EXPR, it "cancels" any PLACEHOLDER_EXPR
1700 in it since it is supplying a value for it. */
1701 code = TREE_CODE (exp);
1702 if (code == WITH_RECORD_EXPR)
1704 else if (code == PLACEHOLDER_EXPR)
1707 switch (TREE_CODE_CLASS (code))
1710 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
1711 position computations since they will be converted into a
1712 WITH_RECORD_EXPR involving the reference, which will assume
1713 here will be valid. */
1714 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));
1717 if (code == TREE_LIST)
1718 return (CONTAINS_PLACEHOLDER_P (TREE_VALUE (exp))
1719 || CONTAINS_PLACEHOLDER_P (TREE_CHAIN (exp)));
1728 /* Ignoring the first operand isn't quite right, but works best. */
1729 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1));
1736 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0))
1737 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1))
1738 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 2)));
1741 /* If we already know this doesn't have a placeholder, don't
1743 if (SAVE_EXPR_NOPLACEHOLDER (exp) || SAVE_EXPR_RTL (exp) != 0)
1746 SAVE_EXPR_NOPLACEHOLDER (exp) = 1;
1747 result = CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));
1749 SAVE_EXPR_NOPLACEHOLDER (exp) = 0;
1754 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1));
1760 switch (TREE_CODE_LENGTH (code))
1763 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));
1765 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0))
1766 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1)));
1777 /* Return 1 if any part of the computation of TYPE involves a PLACEHOLDER_EXPR.
1778 This includes size, bounds, qualifiers (for QUAL_UNION_TYPE) and field
1782 type_contains_placeholder_p (tree type)
1784 /* If the size contains a placeholder or the parent type (component type in
1785 the case of arrays) type involves a placeholder, this type does. */
1786 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type))
1787 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (type))
1788 || (TREE_TYPE (type) != 0
1789 && type_contains_placeholder_p (TREE_TYPE (type))))
1792 /* Now do type-specific checks. Note that the last part of the check above
1793 greatly limits what we have to do below. */
1794 switch (TREE_CODE (type))
1804 case REFERENCE_TYPE:
1812 /* Here we just check the bounds. */
1813 return (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (type))
1814 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (type)));
1818 /* We're already checked the component type (TREE_TYPE), so just check
1820 return type_contains_placeholder_p (TYPE_DOMAIN (type));
1824 case QUAL_UNION_TYPE:
1826 static tree seen_types = 0;
1830 /* We have to be careful here that we don't end up in infinite
1831 recursions due to a field of a type being a pointer to that type
1832 or to a mutually-recursive type. So we store a list of record
1833 types that we've seen and see if this type is in them. To save
1834 memory, we don't use a list for just one type. Here we check
1835 whether we've seen this type before and store it if not. */
1836 if (seen_types == 0)
1838 else if (TREE_CODE (seen_types) != TREE_LIST)
1840 if (seen_types == type)
1843 seen_types = tree_cons (NULL_TREE, type,
1844 build_tree_list (NULL_TREE, seen_types));
1848 if (value_member (type, seen_types) != 0)
1851 seen_types = tree_cons (NULL_TREE, type, seen_types);
1854 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
1855 if (TREE_CODE (field) == FIELD_DECL
1856 && (CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (field))
1857 || (TREE_CODE (type) == QUAL_UNION_TYPE
1858 && CONTAINS_PLACEHOLDER_P (DECL_QUALIFIER (field)))
1859 || type_contains_placeholder_p (TREE_TYPE (field))))
1865 /* Now remove us from seen_types and return the result. */
1866 if (seen_types == type)
1869 seen_types = TREE_CHAIN (seen_types);
1879 /* Return 1 if EXP contains any expressions that produce cleanups for an
1880 outer scope to deal with. Used by fold. */
1883 has_cleanups (tree exp)
1887 if (! TREE_SIDE_EFFECTS (exp))
1890 switch (TREE_CODE (exp))
1893 case GOTO_SUBROUTINE_EXPR:
1894 case WITH_CLEANUP_EXPR:
1897 case CLEANUP_POINT_EXPR:
1901 for (exp = TREE_OPERAND (exp, 1); exp; exp = TREE_CHAIN (exp))
1903 cmp = has_cleanups (TREE_VALUE (exp));
1913 /* This general rule works for most tree codes. All exceptions should be
1914 handled above. If this is a language-specific tree code, we can't
1915 trust what might be in the operand, so say we don't know
1917 if ((int) TREE_CODE (exp) >= (int) LAST_AND_UNUSED_TREE_CODE)
1920 nops = first_rtl_op (TREE_CODE (exp));
1921 for (i = 0; i < nops; i++)
1922 if (TREE_OPERAND (exp, i) != 0)
1924 int type = TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, i)));
1925 if (type == 'e' || type == '<' || type == '1' || type == '2'
1926 || type == 'r' || type == 's')
1928 cmp = has_cleanups (TREE_OPERAND (exp, i));
1937 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
1938 return a tree with all occurrences of references to F in a
1939 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
1940 contains only arithmetic expressions or a CALL_EXPR with a
1941 PLACEHOLDER_EXPR occurring only in its arglist. */
1944 substitute_in_expr (tree exp, tree f, tree r)
1946 enum tree_code code = TREE_CODE (exp);
1951 switch (TREE_CODE_CLASS (code))
1958 if (code == PLACEHOLDER_EXPR)
1960 else if (code == TREE_LIST)
1962 op0 = (TREE_CHAIN (exp) == 0
1963 ? 0 : substitute_in_expr (TREE_CHAIN (exp), f, r));
1964 op1 = substitute_in_expr (TREE_VALUE (exp), f, r);
1965 if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
1968 return tree_cons (TREE_PURPOSE (exp), op1, op0);
1977 switch (TREE_CODE_LENGTH (code))
1980 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
1981 if (op0 == TREE_OPERAND (exp, 0))
1984 if (code == NON_LVALUE_EXPR)
1987 new = fold (build1 (code, TREE_TYPE (exp), op0));
1991 /* An RTL_EXPR cannot contain a PLACEHOLDER_EXPR; a CONSTRUCTOR
1992 could, but we don't support it. */
1993 if (code == RTL_EXPR)
1995 else if (code == CONSTRUCTOR)
1998 op0 = TREE_OPERAND (exp, 0);
1999 op1 = TREE_OPERAND (exp, 1);
2000 if (CONTAINS_PLACEHOLDER_P (op0))
2001 op0 = substitute_in_expr (op0, f, r);
2002 if (CONTAINS_PLACEHOLDER_P (op1))
2003 op1 = substitute_in_expr (op1, f, r);
2005 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
2008 new = fold (build (code, TREE_TYPE (exp), op0, op1));
2012 /* It cannot be that anything inside a SAVE_EXPR contains a
2013 PLACEHOLDER_EXPR. */
2014 if (code == SAVE_EXPR)
2017 else if (code == CALL_EXPR)
2019 op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
2020 if (op1 == TREE_OPERAND (exp, 1))
2023 return build (code, TREE_TYPE (exp),
2024 TREE_OPERAND (exp, 0), op1, NULL_TREE);
2027 else if (code != COND_EXPR)
2030 op0 = TREE_OPERAND (exp, 0);
2031 op1 = TREE_OPERAND (exp, 1);
2032 op2 = TREE_OPERAND (exp, 2);
2034 if (CONTAINS_PLACEHOLDER_P (op0))
2035 op0 = substitute_in_expr (op0, f, r);
2036 if (CONTAINS_PLACEHOLDER_P (op1))
2037 op1 = substitute_in_expr (op1, f, r);
2038 if (CONTAINS_PLACEHOLDER_P (op2))
2039 op2 = substitute_in_expr (op2, f, r);
2041 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
2042 && op2 == TREE_OPERAND (exp, 2))
2045 new = fold (build (code, TREE_TYPE (exp), op0, op1, op2));
2058 /* If this expression is getting a value from a PLACEHOLDER_EXPR
2059 and it is the right field, replace it with R. */
2060 for (inner = TREE_OPERAND (exp, 0);
2061 TREE_CODE_CLASS (TREE_CODE (inner)) == 'r';
2062 inner = TREE_OPERAND (inner, 0))
2064 if (TREE_CODE (inner) == PLACEHOLDER_EXPR
2065 && TREE_OPERAND (exp, 1) == f)
2068 /* If this expression hasn't been completed let, leave it
2070 if (TREE_CODE (inner) == PLACEHOLDER_EXPR
2071 && TREE_TYPE (inner) == 0)
2074 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2075 if (op0 == TREE_OPERAND (exp, 0))
2078 new = fold (build (code, TREE_TYPE (exp), op0,
2079 TREE_OPERAND (exp, 1)));
2083 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2084 op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
2085 op2 = substitute_in_expr (TREE_OPERAND (exp, 2), f, r);
2086 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
2087 && op2 == TREE_OPERAND (exp, 2))
2090 new = fold (build (code, TREE_TYPE (exp), op0, op1, op2));
2095 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2096 if (op0 == TREE_OPERAND (exp, 0))
2099 new = fold (build1 (code, TREE_TYPE (exp), op0));
2111 TREE_READONLY (new) = TREE_READONLY (exp);
2115 /* Stabilize a reference so that we can use it any number of times
2116 without causing its operands to be evaluated more than once.
2117 Returns the stabilized reference. This works by means of save_expr,
2118 so see the caveats in the comments about save_expr.
2120 Also allows conversion expressions whose operands are references.
2121 Any other kind of expression is returned unchanged. */
2124 stabilize_reference (tree ref)
2127 enum tree_code code = TREE_CODE (ref);
2134 /* No action is needed in this case. */
2140 case FIX_TRUNC_EXPR:
2141 case FIX_FLOOR_EXPR:
2142 case FIX_ROUND_EXPR:
2144 result = build_nt (code, stabilize_reference (TREE_OPERAND (ref, 0)));
2148 result = build_nt (INDIRECT_REF,
2149 stabilize_reference_1 (TREE_OPERAND (ref, 0)));
2153 result = build_nt (COMPONENT_REF,
2154 stabilize_reference (TREE_OPERAND (ref, 0)),
2155 TREE_OPERAND (ref, 1));
2159 result = build_nt (BIT_FIELD_REF,
2160 stabilize_reference (TREE_OPERAND (ref, 0)),
2161 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
2162 stabilize_reference_1 (TREE_OPERAND (ref, 2)));
2166 result = build_nt (ARRAY_REF,
2167 stabilize_reference (TREE_OPERAND (ref, 0)),
2168 stabilize_reference_1 (TREE_OPERAND (ref, 1)));
2171 case ARRAY_RANGE_REF:
2172 result = build_nt (ARRAY_RANGE_REF,
2173 stabilize_reference (TREE_OPERAND (ref, 0)),
2174 stabilize_reference_1 (TREE_OPERAND (ref, 1)));
2178 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2179 it wouldn't be ignored. This matters when dealing with
2181 return stabilize_reference_1 (ref);
2184 result = build1 (INDIRECT_REF, TREE_TYPE (ref),
2185 save_expr (build1 (ADDR_EXPR,
2186 build_pointer_type (TREE_TYPE (ref)),
2190 /* If arg isn't a kind of lvalue we recognize, make no change.
2191 Caller should recognize the error for an invalid lvalue. */
2196 return error_mark_node;
2199 TREE_TYPE (result) = TREE_TYPE (ref);
2200 TREE_READONLY (result) = TREE_READONLY (ref);
2201 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (ref);
2202 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);
2207 /* Subroutine of stabilize_reference; this is called for subtrees of
2208 references. Any expression with side-effects must be put in a SAVE_EXPR
2209 to ensure that it is only evaluated once.
2211 We don't put SAVE_EXPR nodes around everything, because assigning very
2212 simple expressions to temporaries causes us to miss good opportunities
2213 for optimizations. Among other things, the opportunity to fold in the
2214 addition of a constant into an addressing mode often gets lost, e.g.
2215 "y[i+1] += x;". In general, we take the approach that we should not make
2216 an assignment unless we are forced into it - i.e., that any non-side effect
2217 operator should be allowed, and that cse should take care of coalescing
2218 multiple utterances of the same expression should that prove fruitful. */
2221 stabilize_reference_1 (tree e)
2224 enum tree_code code = TREE_CODE (e);
2226 /* We cannot ignore const expressions because it might be a reference
2227 to a const array but whose index contains side-effects. But we can
2228 ignore things that are actual constant or that already have been
2229 handled by this function. */
2231 if (TREE_CONSTANT (e) || code == SAVE_EXPR)
2234 switch (TREE_CODE_CLASS (code))
2244 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2245 so that it will only be evaluated once. */
2246 /* The reference (r) and comparison (<) classes could be handled as
2247 below, but it is generally faster to only evaluate them once. */
2248 if (TREE_SIDE_EFFECTS (e))
2249 return save_expr (e);
2253 /* Constants need no processing. In fact, we should never reach
2258 /* Division is slow and tends to be compiled with jumps,
2259 especially the division by powers of 2 that is often
2260 found inside of an array reference. So do it just once. */
2261 if (code == TRUNC_DIV_EXPR || code == TRUNC_MOD_EXPR
2262 || code == FLOOR_DIV_EXPR || code == FLOOR_MOD_EXPR
2263 || code == CEIL_DIV_EXPR || code == CEIL_MOD_EXPR
2264 || code == ROUND_DIV_EXPR || code == ROUND_MOD_EXPR)
2265 return save_expr (e);
2266 /* Recursively stabilize each operand. */
2267 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)),
2268 stabilize_reference_1 (TREE_OPERAND (e, 1)));
2272 /* Recursively stabilize each operand. */
2273 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)));
2280 TREE_TYPE (result) = TREE_TYPE (e);
2281 TREE_READONLY (result) = TREE_READONLY (e);
2282 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (e);
2283 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);
2288 /* Low-level constructors for expressions. */
2290 /* Build an expression of code CODE, data type TYPE,
2291 and operands as specified by the arguments ARG1 and following arguments.
2292 Expressions and reference nodes can be created this way.
2293 Constants, decls, types and misc nodes cannot be. */
2296 build (enum tree_code code, tree tt, ...)
2308 t = make_node (code);
2309 length = TREE_CODE_LENGTH (code);
2312 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
2313 result based on those same flags for the arguments. But if the
2314 arguments aren't really even `tree' expressions, we shouldn't be trying
2316 fro = first_rtl_op (code);
2318 /* Expressions without side effects may be constant if their
2319 arguments are as well. */
2320 constant = (TREE_CODE_CLASS (code) == '<'
2321 || TREE_CODE_CLASS (code) == '1'
2322 || TREE_CODE_CLASS (code) == '2'
2323 || TREE_CODE_CLASS (code) == 'c');
2327 /* This is equivalent to the loop below, but faster. */
2328 tree arg0 = va_arg (p, tree);
2329 tree arg1 = va_arg (p, tree);
2331 TREE_OPERAND (t, 0) = arg0;
2332 TREE_OPERAND (t, 1) = arg1;
2333 TREE_READONLY (t) = 1;
2334 if (arg0 && fro > 0)
2336 if (TREE_SIDE_EFFECTS (arg0))
2337 TREE_SIDE_EFFECTS (t) = 1;
2338 if (!TREE_READONLY (arg0))
2339 TREE_READONLY (t) = 0;
2340 if (!TREE_CONSTANT (arg0))
2344 if (arg1 && fro > 1)
2346 if (TREE_SIDE_EFFECTS (arg1))
2347 TREE_SIDE_EFFECTS (t) = 1;
2348 if (!TREE_READONLY (arg1))
2349 TREE_READONLY (t) = 0;
2350 if (!TREE_CONSTANT (arg1))
2354 else if (length == 1)
2356 tree arg0 = va_arg (p, tree);
2358 /* The only one-operand cases we handle here are those with side-effects.
2359 Others are handled with build1. So don't bother checked if the
2360 arg has side-effects since we'll already have set it.
2362 ??? This really should use build1 too. */
2363 if (TREE_CODE_CLASS (code) != 's')
2365 TREE_OPERAND (t, 0) = arg0;
2369 for (i = 0; i < length; i++)
2371 tree operand = va_arg (p, tree);
2373 TREE_OPERAND (t, i) = operand;
2374 if (operand && fro > i)
2376 if (TREE_SIDE_EFFECTS (operand))
2377 TREE_SIDE_EFFECTS (t) = 1;
2378 if (!TREE_CONSTANT (operand))
2385 TREE_CONSTANT (t) = constant;
2387 if (code == CALL_EXPR && !TREE_SIDE_EFFECTS (t))
2389 /* Calls have side-effects, except those to const or
2391 i = call_expr_flags (t);
2392 if (!(i & (ECF_CONST | ECF_PURE)))
2393 TREE_SIDE_EFFECTS (t) = 1;
2395 /* And even those have side-effects if their arguments do. */
2396 else for (node = TREE_OPERAND (t, 1); node; node = TREE_CHAIN (node))
2397 if (TREE_SIDE_EFFECTS (TREE_VALUE (node)))
2399 TREE_SIDE_EFFECTS (t) = 1;
2407 /* Same as above, but only builds for unary operators.
2408 Saves lions share of calls to `build'; cuts down use
2409 of varargs, which is expensive for RISC machines. */
2412 build1 (enum tree_code code, tree type, tree node)
2414 int length = sizeof (struct tree_exp);
2415 #ifdef GATHER_STATISTICS
2416 tree_node_kind kind;
2420 #ifdef GATHER_STATISTICS
2421 switch (TREE_CODE_CLASS (code))
2423 case 's': /* an expression with side effects */
2426 case 'r': /* a reference */
2434 tree_node_counts[(int) kind]++;
2435 tree_node_sizes[(int) kind] += length;
2438 #ifdef ENABLE_CHECKING
2439 if (TREE_CODE_CLASS (code) == '2'
2440 || TREE_CODE_CLASS (code) == '<'
2441 || TREE_CODE_LENGTH (code) != 1)
2443 #endif /* ENABLE_CHECKING */
2445 t = ggc_alloc_tree (length);
2447 memset (t, 0, sizeof (struct tree_common));
2449 TREE_SET_CODE (t, code);
2451 TREE_TYPE (t) = type;
2452 TREE_COMPLEXITY (t) = 0;
2453 TREE_OPERAND (t, 0) = node;
2454 if (node && first_rtl_op (code) != 0)
2456 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (node);
2457 TREE_READONLY (t) = TREE_READONLY (node);
2460 if (TREE_CODE_CLASS (code) == 's')
2461 TREE_SIDE_EFFECTS (t) = 1;
2468 case PREDECREMENT_EXPR:
2469 case PREINCREMENT_EXPR:
2470 case POSTDECREMENT_EXPR:
2471 case POSTINCREMENT_EXPR:
2472 /* All of these have side-effects, no matter what their
2474 TREE_SIDE_EFFECTS (t) = 1;
2475 TREE_READONLY (t) = 0;
2479 /* Whether a dereference is readonly has nothing to do with whether
2480 its operand is readonly. */
2481 TREE_READONLY (t) = 0;
2487 /* The address of a volatile decl or reference does not have
2488 side-effects. But be careful not to ignore side-effects from
2489 other sources deeper in the expression--if node is a _REF and
2490 one of its operands has side-effects, so do we. */
2491 if (TREE_THIS_VOLATILE (node))
2493 TREE_SIDE_EFFECTS (t) = 0;
2496 int i = first_rtl_op (TREE_CODE (node)) - 1;
2499 if (TREE_SIDE_EFFECTS (TREE_OPERAND (node, i)))
2500 TREE_SIDE_EFFECTS (t) = 1;
2508 if (TREE_CODE_CLASS (code) == '1' && node && TREE_CONSTANT (node))
2509 TREE_CONSTANT (t) = 1;
2516 /* Similar except don't specify the TREE_TYPE
2517 and leave the TREE_SIDE_EFFECTS as 0.
2518 It is permissible for arguments to be null,
2519 or even garbage if their values do not matter. */
2522 build_nt (enum tree_code code, ...)
2531 t = make_node (code);
2532 length = TREE_CODE_LENGTH (code);
2534 for (i = 0; i < length; i++)
2535 TREE_OPERAND (t, i) = va_arg (p, tree);
2541 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
2542 We do NOT enter this node in any sort of symbol table.
2544 layout_decl is used to set up the decl's storage layout.
2545 Other slots are initialized to 0 or null pointers. */
2548 build_decl (enum tree_code code, tree name, tree type)
2552 t = make_node (code);
2554 /* if (type == error_mark_node)
2555 type = integer_type_node; */
2556 /* That is not done, deliberately, so that having error_mark_node
2557 as the type can suppress useless errors in the use of this variable. */
2559 DECL_NAME (t) = name;
2560 TREE_TYPE (t) = type;
2562 if (code == VAR_DECL || code == PARM_DECL || code == RESULT_DECL)
2564 else if (code == FUNCTION_DECL)
2565 DECL_MODE (t) = FUNCTION_MODE;
2570 /* BLOCK nodes are used to represent the structure of binding contours
2571 and declarations, once those contours have been exited and their contents
2572 compiled. This information is used for outputting debugging info. */
2575 build_block (tree vars, tree tags ATTRIBUTE_UNUSED, tree subblocks,
2576 tree supercontext, tree chain)
2578 tree block = make_node (BLOCK);
2580 BLOCK_VARS (block) = vars;
2581 BLOCK_SUBBLOCKS (block) = subblocks;
2582 BLOCK_SUPERCONTEXT (block) = supercontext;
2583 BLOCK_CHAIN (block) = chain;
2587 /* EXPR_WITH_FILE_LOCATION are used to keep track of the exact
2588 location where an expression or an identifier were encountered. It
2589 is necessary for languages where the frontend parser will handle
2590 recursively more than one file (Java is one of them). */
2593 build_expr_wfl (tree node, const char *file, int line, int col)
2595 static const char *last_file = 0;
2596 static tree last_filenode = NULL_TREE;
2597 tree wfl = make_node (EXPR_WITH_FILE_LOCATION);
2599 EXPR_WFL_NODE (wfl) = node;
2600 EXPR_WFL_SET_LINECOL (wfl, line, col);
2601 if (file != last_file)
2604 last_filenode = file ? get_identifier (file) : NULL_TREE;
2607 EXPR_WFL_FILENAME_NODE (wfl) = last_filenode;
2610 TREE_SIDE_EFFECTS (wfl) = TREE_SIDE_EFFECTS (node);
2611 TREE_TYPE (wfl) = TREE_TYPE (node);
2617 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
2621 build_decl_attribute_variant (tree ddecl, tree attribute)
2623 DECL_ATTRIBUTES (ddecl) = attribute;
2627 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
2630 Record such modified types already made so we don't make duplicates. */
2633 build_type_attribute_variant (tree ttype, tree attribute)
2635 if (! attribute_list_equal (TYPE_ATTRIBUTES (ttype), attribute))
2637 unsigned int hashcode;
2640 ntype = copy_node (ttype);
2642 TYPE_POINTER_TO (ntype) = 0;
2643 TYPE_REFERENCE_TO (ntype) = 0;
2644 TYPE_ATTRIBUTES (ntype) = attribute;
2646 /* Create a new main variant of TYPE. */
2647 TYPE_MAIN_VARIANT (ntype) = ntype;
2648 TYPE_NEXT_VARIANT (ntype) = 0;
2649 set_type_quals (ntype, TYPE_UNQUALIFIED);
2651 hashcode = (TYPE_HASH (TREE_CODE (ntype))
2652 + TYPE_HASH (TREE_TYPE (ntype))
2653 + attribute_hash_list (attribute));
2655 switch (TREE_CODE (ntype))
2658 hashcode += TYPE_HASH (TYPE_ARG_TYPES (ntype));
2661 hashcode += TYPE_HASH (TYPE_DOMAIN (ntype));
2664 hashcode += TYPE_HASH (TYPE_MAX_VALUE (ntype));
2667 hashcode += TYPE_HASH (TYPE_PRECISION (ntype));
2673 ntype = type_hash_canon (hashcode, ntype);
2674 ttype = build_qualified_type (ntype, TYPE_QUALS (ttype));
2680 /* Return nonzero if IDENT is a valid name for attribute ATTR,
2683 We try both `text' and `__text__', ATTR may be either one. */
2684 /* ??? It might be a reasonable simplification to require ATTR to be only
2685 `text'. One might then also require attribute lists to be stored in
2686 their canonicalized form. */
2689 is_attribute_p (const char *attr, tree ident)
2691 int ident_len, attr_len;
2694 if (TREE_CODE (ident) != IDENTIFIER_NODE)
2697 if (strcmp (attr, IDENTIFIER_POINTER (ident)) == 0)
2700 p = IDENTIFIER_POINTER (ident);
2701 ident_len = strlen (p);
2702 attr_len = strlen (attr);
2704 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
2708 || attr[attr_len - 2] != '_'
2709 || attr[attr_len - 1] != '_')
2711 if (ident_len == attr_len - 4
2712 && strncmp (attr + 2, p, attr_len - 4) == 0)
2717 if (ident_len == attr_len + 4
2718 && p[0] == '_' && p[1] == '_'
2719 && p[ident_len - 2] == '_' && p[ident_len - 1] == '_'
2720 && strncmp (attr, p + 2, attr_len) == 0)
2727 /* Given an attribute name and a list of attributes, return a pointer to the
2728 attribute's list element if the attribute is part of the list, or NULL_TREE
2729 if not found. If the attribute appears more than once, this only
2730 returns the first occurrence; the TREE_CHAIN of the return value should
2731 be passed back in if further occurrences are wanted. */
2734 lookup_attribute (const char *attr_name, tree list)
2738 for (l = list; l; l = TREE_CHAIN (l))
2740 if (TREE_CODE (TREE_PURPOSE (l)) != IDENTIFIER_NODE)
2742 if (is_attribute_p (attr_name, TREE_PURPOSE (l)))
2749 /* Return an attribute list that is the union of a1 and a2. */
2752 merge_attributes (tree a1, tree a2)
2756 /* Either one unset? Take the set one. */
2758 if ((attributes = a1) == 0)
2761 /* One that completely contains the other? Take it. */
2763 else if (a2 != 0 && ! attribute_list_contained (a1, a2))
2765 if (attribute_list_contained (a2, a1))
2769 /* Pick the longest list, and hang on the other list. */
2771 if (list_length (a1) < list_length (a2))
2772 attributes = a2, a2 = a1;
2774 for (; a2 != 0; a2 = TREE_CHAIN (a2))
2777 for (a = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)),
2780 a = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)),
2783 if (simple_cst_equal (TREE_VALUE (a), TREE_VALUE (a2)) == 1)
2788 a1 = copy_node (a2);
2789 TREE_CHAIN (a1) = attributes;
2798 /* Given types T1 and T2, merge their attributes and return
2802 merge_type_attributes (tree t1, tree t2)
2804 return merge_attributes (TYPE_ATTRIBUTES (t1),
2805 TYPE_ATTRIBUTES (t2));
2808 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
2812 merge_decl_attributes (tree olddecl, tree newdecl)
2814 return merge_attributes (DECL_ATTRIBUTES (olddecl),
2815 DECL_ATTRIBUTES (newdecl));
2818 #ifdef TARGET_DLLIMPORT_DECL_ATTRIBUTES
2820 /* Specialization of merge_decl_attributes for various Windows targets.
2822 This handles the following situation:
2824 __declspec (dllimport) int foo;
2827 The second instance of `foo' nullifies the dllimport. */
2830 merge_dllimport_decl_attributes (tree old, tree new)
2833 int delete_dllimport_p;
2835 old = DECL_ATTRIBUTES (old);
2836 new = DECL_ATTRIBUTES (new);
2838 /* What we need to do here is remove from `old' dllimport if it doesn't
2839 appear in `new'. dllimport behaves like extern: if a declaration is
2840 marked dllimport and a definition appears later, then the object
2841 is not dllimport'd. */
2842 if (lookup_attribute ("dllimport", old) != NULL_TREE
2843 && lookup_attribute ("dllimport", new) == NULL_TREE)
2844 delete_dllimport_p = 1;
2846 delete_dllimport_p = 0;
2848 a = merge_attributes (old, new);
2850 if (delete_dllimport_p)
2854 /* Scan the list for dllimport and delete it. */
2855 for (prev = NULL_TREE, t = a; t; prev = t, t = TREE_CHAIN (t))
2857 if (is_attribute_p ("dllimport", TREE_PURPOSE (t)))
2859 if (prev == NULL_TREE)
2862 TREE_CHAIN (prev) = TREE_CHAIN (t);
2871 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
2873 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
2874 of the various TYPE_QUAL values. */
2877 set_type_quals (tree type, int type_quals)
2879 TYPE_READONLY (type) = (type_quals & TYPE_QUAL_CONST) != 0;
2880 TYPE_VOLATILE (type) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
2881 TYPE_RESTRICT (type) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
2884 /* Return a version of the TYPE, qualified as indicated by the
2885 TYPE_QUALS, if one exists. If no qualified version exists yet,
2886 return NULL_TREE. */
2889 get_qualified_type (tree type, int type_quals)
2893 /* Search the chain of variants to see if there is already one there just
2894 like the one we need to have. If so, use that existing one. We must
2895 preserve the TYPE_NAME, since there is code that depends on this. */
2896 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
2897 if (TYPE_QUALS (t) == type_quals && TYPE_NAME (t) == TYPE_NAME (type)
2898 && TYPE_CONTEXT (t) == TYPE_CONTEXT (type)
2899 && attribute_list_equal (TYPE_ATTRIBUTES (t), TYPE_ATTRIBUTES (type)))
2905 /* Like get_qualified_type, but creates the type if it does not
2906 exist. This function never returns NULL_TREE. */
2909 build_qualified_type (tree type, int type_quals)
2913 /* See if we already have the appropriate qualified variant. */
2914 t = get_qualified_type (type, type_quals);
2916 /* If not, build it. */
2919 t = build_type_copy (type);
2920 set_type_quals (t, type_quals);
2926 /* Create a new variant of TYPE, equivalent but distinct.
2927 This is so the caller can modify it. */
2930 build_type_copy (tree type)
2932 tree t, m = TYPE_MAIN_VARIANT (type);
2934 t = copy_node (type);
2936 TYPE_POINTER_TO (t) = 0;
2937 TYPE_REFERENCE_TO (t) = 0;
2939 /* Add this type to the chain of variants of TYPE. */
2940 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (m);
2941 TYPE_NEXT_VARIANT (m) = t;
2946 /* Hashing of types so that we don't make duplicates.
2947 The entry point is `type_hash_canon'. */
2949 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
2950 with types in the TREE_VALUE slots), by adding the hash codes
2951 of the individual types. */
2954 type_hash_list (tree list)
2956 unsigned int hashcode;
2959 for (hashcode = 0, tail = list; tail; tail = TREE_CHAIN (tail))
2960 hashcode += TYPE_HASH (TREE_VALUE (tail));
2965 /* These are the Hashtable callback functions. */
2967 /* Returns true if the types are equal. */
2970 type_hash_eq (const void *va, const void *vb)
2972 const struct type_hash *a = va, *b = vb;
2973 if (a->hash == b->hash
2974 && TREE_CODE (a->type) == TREE_CODE (b->type)
2975 && TREE_TYPE (a->type) == TREE_TYPE (b->type)
2976 && attribute_list_equal (TYPE_ATTRIBUTES (a->type),
2977 TYPE_ATTRIBUTES (b->type))
2978 && TYPE_ALIGN (a->type) == TYPE_ALIGN (b->type)
2979 && (TYPE_MAX_VALUE (a->type) == TYPE_MAX_VALUE (b->type)
2980 || tree_int_cst_equal (TYPE_MAX_VALUE (a->type),
2981 TYPE_MAX_VALUE (b->type)))
2982 && (TYPE_MIN_VALUE (a->type) == TYPE_MIN_VALUE (b->type)
2983 || tree_int_cst_equal (TYPE_MIN_VALUE (a->type),
2984 TYPE_MIN_VALUE (b->type)))
2985 /* Note that TYPE_DOMAIN is TYPE_ARG_TYPES for FUNCTION_TYPE. */
2986 && (TYPE_DOMAIN (a->type) == TYPE_DOMAIN (b->type)
2987 || (TYPE_DOMAIN (a->type)
2988 && TREE_CODE (TYPE_DOMAIN (a->type)) == TREE_LIST
2989 && TYPE_DOMAIN (b->type)
2990 && TREE_CODE (TYPE_DOMAIN (b->type)) == TREE_LIST
2991 && type_list_equal (TYPE_DOMAIN (a->type),
2992 TYPE_DOMAIN (b->type)))))
2997 /* Return the cached hash value. */
3000 type_hash_hash (const void *item)
3002 return ((const struct type_hash *) item)->hash;
3005 /* Look in the type hash table for a type isomorphic to TYPE.
3006 If one is found, return it. Otherwise return 0. */
3009 type_hash_lookup (unsigned int hashcode, tree type)
3011 struct type_hash *h, in;
3013 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
3014 must call that routine before comparing TYPE_ALIGNs. */
3020 h = htab_find_with_hash (type_hash_table, &in, hashcode);
3026 /* Add an entry to the type-hash-table
3027 for a type TYPE whose hash code is HASHCODE. */
3030 type_hash_add (unsigned int hashcode, tree type)
3032 struct type_hash *h;
3035 h = ggc_alloc (sizeof (struct type_hash));
3038 loc = htab_find_slot_with_hash (type_hash_table, h, hashcode, INSERT);
3039 *(struct type_hash **) loc = h;
3042 /* Given TYPE, and HASHCODE its hash code, return the canonical
3043 object for an identical type if one already exists.
3044 Otherwise, return TYPE, and record it as the canonical object
3045 if it is a permanent object.
3047 To use this function, first create a type of the sort you want.
3048 Then compute its hash code from the fields of the type that
3049 make it different from other similar types.
3050 Then call this function and use the value.
3051 This function frees the type you pass in if it is a duplicate. */
3053 /* Set to 1 to debug without canonicalization. Never set by program. */
3054 int debug_no_type_hash = 0;
3057 type_hash_canon (unsigned int hashcode, tree type)
3061 if (debug_no_type_hash)
3064 /* See if the type is in the hash table already. If so, return it.
3065 Otherwise, add the type. */
3066 t1 = type_hash_lookup (hashcode, type);
3069 #ifdef GATHER_STATISTICS
3070 tree_node_counts[(int) t_kind]--;
3071 tree_node_sizes[(int) t_kind] -= sizeof (struct tree_type);
3077 type_hash_add (hashcode, type);
3082 /* See if the data pointed to by the type hash table is marked. We consider
3083 it marked if the type is marked or if a debug type number or symbol
3084 table entry has been made for the type. This reduces the amount of
3085 debugging output and eliminates that dependency of the debug output on
3086 the number of garbage collections. */
3089 type_hash_marked_p (const void *p)
3091 tree type = ((struct type_hash *) p)->type;
3093 return ggc_marked_p (type) || TYPE_SYMTAB_POINTER (type);
3097 print_type_hash_statistics (void)
3099 fprintf (stderr, "Type hash: size %ld, %ld elements, %f collisions\n",
3100 (long) htab_size (type_hash_table),
3101 (long) htab_elements (type_hash_table),
3102 htab_collisions (type_hash_table));
3105 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
3106 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
3107 by adding the hash codes of the individual attributes. */
3110 attribute_hash_list (tree list)
3112 unsigned int hashcode;
3115 for (hashcode = 0, tail = list; tail; tail = TREE_CHAIN (tail))
3116 /* ??? Do we want to add in TREE_VALUE too? */
3117 hashcode += TYPE_HASH (TREE_PURPOSE (tail));
3121 /* Given two lists of attributes, return true if list l2 is
3122 equivalent to l1. */
3125 attribute_list_equal (tree l1, tree l2)
3127 return attribute_list_contained (l1, l2)
3128 && attribute_list_contained (l2, l1);
3131 /* Given two lists of attributes, return true if list L2 is
3132 completely contained within L1. */
3133 /* ??? This would be faster if attribute names were stored in a canonicalized
3134 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
3135 must be used to show these elements are equivalent (which they are). */
3136 /* ??? It's not clear that attributes with arguments will always be handled
3140 attribute_list_contained (tree l1, tree l2)
3144 /* First check the obvious, maybe the lists are identical. */
3148 /* Maybe the lists are similar. */
3149 for (t1 = l1, t2 = l2;
3151 && TREE_PURPOSE (t1) == TREE_PURPOSE (t2)
3152 && TREE_VALUE (t1) == TREE_VALUE (t2);
3153 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2));
3155 /* Maybe the lists are equal. */
3156 if (t1 == 0 && t2 == 0)
3159 for (; t2 != 0; t2 = TREE_CHAIN (t2))
3162 for (attr = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)), l1);
3164 attr = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)),
3167 if (simple_cst_equal (TREE_VALUE (t2), TREE_VALUE (attr)) == 1)
3174 if (simple_cst_equal (TREE_VALUE (t2), TREE_VALUE (attr)) != 1)
3181 /* Given two lists of types
3182 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
3183 return 1 if the lists contain the same types in the same order.
3184 Also, the TREE_PURPOSEs must match. */
3187 type_list_equal (tree l1, tree l2)
3191 for (t1 = l1, t2 = l2; t1 && t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
3192 if (TREE_VALUE (t1) != TREE_VALUE (t2)
3193 || (TREE_PURPOSE (t1) != TREE_PURPOSE (t2)
3194 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2))
3195 && (TREE_TYPE (TREE_PURPOSE (t1))
3196 == TREE_TYPE (TREE_PURPOSE (t2))))))
3202 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
3203 given by TYPE. If the argument list accepts variable arguments,
3204 then this function counts only the ordinary arguments. */
3207 type_num_arguments (tree type)
3212 for (t = TYPE_ARG_TYPES (type); t; t = TREE_CHAIN (t))
3213 /* If the function does not take a variable number of arguments,
3214 the last element in the list will have type `void'. */
3215 if (VOID_TYPE_P (TREE_VALUE (t)))
3223 /* Nonzero if integer constants T1 and T2
3224 represent the same constant value. */
3227 tree_int_cst_equal (tree t1, tree t2)
3232 if (t1 == 0 || t2 == 0)
3235 if (TREE_CODE (t1) == INTEGER_CST
3236 && TREE_CODE (t2) == INTEGER_CST
3237 && TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
3238 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2))
3244 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
3245 The precise way of comparison depends on their data type. */
3248 tree_int_cst_lt (tree t1, tree t2)
3253 if (TREE_UNSIGNED (TREE_TYPE (t1)) != TREE_UNSIGNED (TREE_TYPE (t2)))
3255 int t1_sgn = tree_int_cst_sgn (t1);
3256 int t2_sgn = tree_int_cst_sgn (t2);
3258 if (t1_sgn < t2_sgn)
3260 else if (t1_sgn > t2_sgn)
3262 /* Otherwise, both are non-negative, so we compare them as
3263 unsigned just in case one of them would overflow a signed
3266 else if (! TREE_UNSIGNED (TREE_TYPE (t1)))
3267 return INT_CST_LT (t1, t2);
3269 return INT_CST_LT_UNSIGNED (t1, t2);
3272 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
3275 tree_int_cst_compare (tree t1, tree t2)
3277 if (tree_int_cst_lt (t1, t2))
3279 else if (tree_int_cst_lt (t2, t1))
3285 /* Return 1 if T is an INTEGER_CST that can be manipulated efficiently on
3286 the host. If POS is zero, the value can be represented in a single
3287 HOST_WIDE_INT. If POS is nonzero, the value must be positive and can
3288 be represented in a single unsigned HOST_WIDE_INT. */
3291 host_integerp (tree t, int pos)
3293 return (TREE_CODE (t) == INTEGER_CST
3294 && ! TREE_OVERFLOW (t)
3295 && ((TREE_INT_CST_HIGH (t) == 0
3296 && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) >= 0)
3297 || (! pos && TREE_INT_CST_HIGH (t) == -1
3298 && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0
3299 && ! TREE_UNSIGNED (TREE_TYPE (t)))
3300 || (pos && TREE_INT_CST_HIGH (t) == 0)));
3303 /* Return the HOST_WIDE_INT least significant bits of T if it is an
3304 INTEGER_CST and there is no overflow. POS is nonzero if the result must
3305 be positive. Abort if we cannot satisfy the above conditions. */
3308 tree_low_cst (tree t, int pos)
3310 if (host_integerp (t, pos))
3311 return TREE_INT_CST_LOW (t);
3316 /* Return the most significant bit of the integer constant T. */
3319 tree_int_cst_msb (tree t)
3323 unsigned HOST_WIDE_INT l;
3325 /* Note that using TYPE_PRECISION here is wrong. We care about the
3326 actual bits, not the (arbitrary) range of the type. */
3327 prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t))) - 1;
3328 rshift_double (TREE_INT_CST_LOW (t), TREE_INT_CST_HIGH (t), prec,
3329 2 * HOST_BITS_PER_WIDE_INT, &l, &h, 0);
3330 return (l & 1) == 1;
3333 /* Return an indication of the sign of the integer constant T.
3334 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
3335 Note that -1 will never be returned it T's type is unsigned. */
3338 tree_int_cst_sgn (tree t)
3340 if (TREE_INT_CST_LOW (t) == 0 && TREE_INT_CST_HIGH (t) == 0)
3342 else if (TREE_UNSIGNED (TREE_TYPE (t)))
3344 else if (TREE_INT_CST_HIGH (t) < 0)
3350 /* Compare two constructor-element-type constants. Return 1 if the lists
3351 are known to be equal; otherwise return 0. */
3354 simple_cst_list_equal (tree l1, tree l2)
3356 while (l1 != NULL_TREE && l2 != NULL_TREE)
3358 if (simple_cst_equal (TREE_VALUE (l1), TREE_VALUE (l2)) != 1)
3361 l1 = TREE_CHAIN (l1);
3362 l2 = TREE_CHAIN (l2);
3368 /* Return truthvalue of whether T1 is the same tree structure as T2.
3369 Return 1 if they are the same.
3370 Return 0 if they are understandably different.
3371 Return -1 if either contains tree structure not understood by
3375 simple_cst_equal (tree t1, tree t2)
3377 enum tree_code code1, code2;
3383 if (t1 == 0 || t2 == 0)
3386 code1 = TREE_CODE (t1);
3387 code2 = TREE_CODE (t2);
3389 if (code1 == NOP_EXPR || code1 == CONVERT_EXPR || code1 == NON_LVALUE_EXPR)
3391 if (code2 == NOP_EXPR || code2 == CONVERT_EXPR
3392 || code2 == NON_LVALUE_EXPR)
3393 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3395 return simple_cst_equal (TREE_OPERAND (t1, 0), t2);
3398 else if (code2 == NOP_EXPR || code2 == CONVERT_EXPR
3399 || code2 == NON_LVALUE_EXPR)
3400 return simple_cst_equal (t1, TREE_OPERAND (t2, 0));
3408 return (TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
3409 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2));
3412 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
3415 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
3416 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
3417 TREE_STRING_LENGTH (t1)));
3420 if (CONSTRUCTOR_ELTS (t1) == CONSTRUCTOR_ELTS (t2))
3426 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3429 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3433 simple_cst_list_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
3436 /* Special case: if either target is an unallocated VAR_DECL,
3437 it means that it's going to be unified with whatever the
3438 TARGET_EXPR is really supposed to initialize, so treat it
3439 as being equivalent to anything. */
3440 if ((TREE_CODE (TREE_OPERAND (t1, 0)) == VAR_DECL
3441 && DECL_NAME (TREE_OPERAND (t1, 0)) == NULL_TREE
3442 && !DECL_RTL_SET_P (TREE_OPERAND (t1, 0)))
3443 || (TREE_CODE (TREE_OPERAND (t2, 0)) == VAR_DECL
3444 && DECL_NAME (TREE_OPERAND (t2, 0)) == NULL_TREE
3445 && !DECL_RTL_SET_P (TREE_OPERAND (t2, 0))))
3448 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3453 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
3455 case WITH_CLEANUP_EXPR:
3456 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3460 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t1, 1));
3463 if (TREE_OPERAND (t1, 1) == TREE_OPERAND (t2, 1))
3464 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3478 /* This general rule works for most tree codes. All exceptions should be
3479 handled above. If this is a language-specific tree code, we can't
3480 trust what might be in the operand, so say we don't know
3482 if ((int) code1 >= (int) LAST_AND_UNUSED_TREE_CODE)
3485 switch (TREE_CODE_CLASS (code1))
3494 for (i = 0; i < TREE_CODE_LENGTH (code1); i++)
3496 cmp = simple_cst_equal (TREE_OPERAND (t1, i), TREE_OPERAND (t2, i));
3508 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
3509 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
3510 than U, respectively. */
3513 compare_tree_int (tree t, unsigned HOST_WIDE_INT u)
3515 if (tree_int_cst_sgn (t) < 0)
3517 else if (TREE_INT_CST_HIGH (t) != 0)
3519 else if (TREE_INT_CST_LOW (t) == u)
3521 else if (TREE_INT_CST_LOW (t) < u)
3527 /* Return true if CODE represents an associative tree code. Otherwise
3530 associative_tree_code (enum tree_code code)
3552 /* Return true if CODE represents an commutative tree code. Otherwise
3555 commutative_tree_code (enum tree_code code)
3576 /* Generate a hash value for an expression. This can be used iteratively
3577 by passing a previous result as the "val" argument.
3579 This function is intended to produce the same hash for expressions which
3580 would compare equal using operand_equal_p. */
3583 iterative_hash_expr (tree t, hashval_t val)
3586 enum tree_code code;
3590 return iterative_hash_object (t, val);
3592 code = TREE_CODE (t);
3593 class = TREE_CODE_CLASS (code);
3597 /* Decls we can just compare by pointer. */
3598 val = iterative_hash_object (t, val);
3600 else if (class == 'c')
3602 /* Alas, constants aren't shared, so we can't rely on pointer
3604 if (code == INTEGER_CST)
3606 val = iterative_hash_object (TREE_INT_CST_LOW (t), val);
3607 val = iterative_hash_object (TREE_INT_CST_HIGH (t), val);
3609 else if (code == REAL_CST)
3610 val = iterative_hash (TREE_REAL_CST_PTR (t),
3611 sizeof (REAL_VALUE_TYPE), val);
3612 else if (code == STRING_CST)
3613 val = iterative_hash (TREE_STRING_POINTER (t),
3614 TREE_STRING_LENGTH (t), val);
3615 else if (code == COMPLEX_CST)
3617 val = iterative_hash_expr (TREE_REALPART (t), val);
3618 val = iterative_hash_expr (TREE_IMAGPART (t), val);
3620 else if (code == VECTOR_CST)
3621 val = iterative_hash_expr (TREE_VECTOR_CST_ELTS (t), val);
3625 else if (IS_EXPR_CODE_CLASS (class))
3627 val = iterative_hash_object (code, val);
3629 if (code == NOP_EXPR || code == CONVERT_EXPR
3630 || code == NON_LVALUE_EXPR)
3631 val = iterative_hash_object (TREE_TYPE (t), val);
3633 if (commutative_tree_code (code))
3635 /* It's a commutative expression. We want to hash it the same
3636 however it appears. We do this by first hashing both operands
3637 and then rehashing based on the order of their independent
3639 hashval_t one = iterative_hash_expr (TREE_OPERAND (t, 0), 0);
3640 hashval_t two = iterative_hash_expr (TREE_OPERAND (t, 1), 0);
3644 t = one, one = two, two = t;
3646 val = iterative_hash_object (one, val);
3647 val = iterative_hash_object (two, val);
3650 for (i = first_rtl_op (code) - 1; i >= 0; --i)
3651 val = iterative_hash_expr (TREE_OPERAND (t, i), val);
3653 else if (code == TREE_LIST)
3655 /* A list of expressions, for a CALL_EXPR or as the elements of a
3657 for (; t; t = TREE_CHAIN (t))
3658 val = iterative_hash_expr (TREE_VALUE (t), val);
3666 /* Constructors for pointer, array and function types.
3667 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
3668 constructed by language-dependent code, not here.) */
3670 /* Construct, lay out and return the type of pointers to TO_TYPE
3671 with mode MODE. If such a type has already been constructed,
3675 build_pointer_type_for_mode (tree to_type, enum machine_mode mode)
3677 tree t = TYPE_POINTER_TO (to_type);
3679 /* First, if we already have a type for pointers to TO_TYPE, use it. */
3680 if (t != 0 && mode == ptr_mode)
3683 t = make_node (POINTER_TYPE);
3685 TREE_TYPE (t) = to_type;
3686 TYPE_MODE (t) = mode;
3688 /* Record this type as the pointer to TO_TYPE. */
3689 if (mode == ptr_mode)
3690 TYPE_POINTER_TO (to_type) = t;
3692 /* Lay out the type. This function has many callers that are concerned
3693 with expression-construction, and this simplifies them all.
3694 Also, it guarantees the TYPE_SIZE is in the same obstack as the type. */
3700 /* By default build pointers in ptr_mode. */
3703 build_pointer_type (tree to_type)
3705 return build_pointer_type_for_mode (to_type, ptr_mode);
3708 /* Construct, lay out and return the type of references to TO_TYPE
3709 with mode MODE. If such a type has already been constructed,
3713 build_reference_type_for_mode (tree to_type, enum machine_mode mode)
3715 tree t = TYPE_REFERENCE_TO (to_type);
3717 /* First, if we already have a type for pointers to TO_TYPE, use it. */
3718 if (t != 0 && mode == ptr_mode)
3721 t = make_node (REFERENCE_TYPE);
3723 TREE_TYPE (t) = to_type;
3724 TYPE_MODE (t) = mode;
3726 /* Record this type as the pointer to TO_TYPE. */
3727 if (mode == ptr_mode)
3728 TYPE_REFERENCE_TO (to_type) = t;
3736 /* Build the node for the type of references-to-TO_TYPE by default
3740 build_reference_type (tree to_type)
3742 return build_reference_type_for_mode (to_type, ptr_mode);
3745 /* Build a type that is compatible with t but has no cv quals anywhere
3748 const char *const *const * -> char ***. */
3751 build_type_no_quals (tree t)
3753 switch (TREE_CODE (t))
3756 return build_pointer_type (build_type_no_quals (TREE_TYPE (t)));
3757 case REFERENCE_TYPE:
3758 return build_reference_type (build_type_no_quals (TREE_TYPE (t)));
3760 return TYPE_MAIN_VARIANT (t);
3764 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
3765 MAXVAL should be the maximum value in the domain
3766 (one less than the length of the array).
3768 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
3769 We don't enforce this limit, that is up to caller (e.g. language front end).
3770 The limit exists because the result is a signed type and we don't handle
3771 sizes that use more than one HOST_WIDE_INT. */
3774 build_index_type (tree maxval)
3776 tree itype = make_node (INTEGER_TYPE);
3778 TREE_TYPE (itype) = sizetype;
3779 TYPE_PRECISION (itype) = TYPE_PRECISION (sizetype);
3780 TYPE_MIN_VALUE (itype) = size_zero_node;
3781 TYPE_MAX_VALUE (itype) = convert (sizetype, maxval);
3782 TYPE_MODE (itype) = TYPE_MODE (sizetype);
3783 TYPE_SIZE (itype) = TYPE_SIZE (sizetype);
3784 TYPE_SIZE_UNIT (itype) = TYPE_SIZE_UNIT (sizetype);
3785 TYPE_ALIGN (itype) = TYPE_ALIGN (sizetype);
3786 TYPE_USER_ALIGN (itype) = TYPE_USER_ALIGN (sizetype);
3788 if (host_integerp (maxval, 1))
3789 return type_hash_canon (tree_low_cst (maxval, 1), itype);
3794 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
3795 ENUMERAL_TYPE, BOOLEAN_TYPE, or CHAR_TYPE), with
3796 low bound LOWVAL and high bound HIGHVAL.
3797 if TYPE==NULL_TREE, sizetype is used. */
3800 build_range_type (tree type, tree lowval, tree highval)
3802 tree itype = make_node (INTEGER_TYPE);
3804 TREE_TYPE (itype) = type;
3805 if (type == NULL_TREE)
3808 TYPE_MIN_VALUE (itype) = convert (type, lowval);
3809 TYPE_MAX_VALUE (itype) = highval ? convert (type, highval) : NULL;
3811 TYPE_PRECISION (itype) = TYPE_PRECISION (type);
3812 TYPE_MODE (itype) = TYPE_MODE (type);
3813 TYPE_SIZE (itype) = TYPE_SIZE (type);
3814 TYPE_SIZE_UNIT (itype) = TYPE_SIZE_UNIT (type);
3815 TYPE_ALIGN (itype) = TYPE_ALIGN (type);
3816 TYPE_USER_ALIGN (itype) = TYPE_USER_ALIGN (type);
3818 if (host_integerp (lowval, 0) && highval != 0 && host_integerp (highval, 0))
3819 return type_hash_canon (tree_low_cst (highval, 0)
3820 - tree_low_cst (lowval, 0),
3826 /* Just like build_index_type, but takes lowval and highval instead
3827 of just highval (maxval). */
3830 build_index_2_type (tree lowval, tree highval)
3832 return build_range_type (sizetype, lowval, highval);
3835 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
3836 and number of elements specified by the range of values of INDEX_TYPE.
3837 If such a type has already been constructed, reuse it. */
3840 build_array_type (tree elt_type, tree index_type)
3843 unsigned int hashcode;
3845 if (TREE_CODE (elt_type) == FUNCTION_TYPE)
3847 error ("arrays of functions are not meaningful");
3848 elt_type = integer_type_node;
3851 /* Make sure TYPE_POINTER_TO (elt_type) is filled in. */
3852 build_pointer_type (elt_type);
3854 /* Allocate the array after the pointer type,
3855 in case we free it in type_hash_canon. */
3856 t = make_node (ARRAY_TYPE);
3857 TREE_TYPE (t) = elt_type;
3858 TYPE_DOMAIN (t) = index_type;
3860 if (index_type == 0)
3865 hashcode = TYPE_HASH (elt_type) + TYPE_HASH (index_type);
3866 t = type_hash_canon (hashcode, t);
3868 if (!COMPLETE_TYPE_P (t))
3873 /* Return the TYPE of the elements comprising
3874 the innermost dimension of ARRAY. */
3877 get_inner_array_type (tree array)
3879 tree type = TREE_TYPE (array);
3881 while (TREE_CODE (type) == ARRAY_TYPE)
3882 type = TREE_TYPE (type);
3887 /* Construct, lay out and return
3888 the type of functions returning type VALUE_TYPE
3889 given arguments of types ARG_TYPES.
3890 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
3891 are data type nodes for the arguments of the function.
3892 If such a type has already been constructed, reuse it. */
3895 build_function_type (tree value_type, tree arg_types)
3898 unsigned int hashcode;
3900 if (TREE_CODE (value_type) == FUNCTION_TYPE)
3902 error ("function return type cannot be function");
3903 value_type = integer_type_node;
3906 /* Make a node of the sort we want. */
3907 t = make_node (FUNCTION_TYPE);
3908 TREE_TYPE (t) = value_type;
3909 TYPE_ARG_TYPES (t) = arg_types;
3911 /* If we already have such a type, use the old one and free this one. */
3912 hashcode = TYPE_HASH (value_type) + type_hash_list (arg_types);
3913 t = type_hash_canon (hashcode, t);
3915 if (!COMPLETE_TYPE_P (t))
3920 /* Build a function type. The RETURN_TYPE is the type returned by the
3921 function. If additional arguments are provided, they are
3922 additional argument types. The list of argument types must always
3923 be terminated by NULL_TREE. */
3926 build_function_type_list (tree return_type, ...)
3931 va_start (p, return_type);
3933 t = va_arg (p, tree);
3934 for (args = NULL_TREE; t != NULL_TREE; t = va_arg (p, tree))
3935 args = tree_cons (NULL_TREE, t, args);
3938 args = nreverse (args);
3939 TREE_CHAIN (last) = void_list_node;
3940 args = build_function_type (return_type, args);
3946 /* Build a METHOD_TYPE for a member of BASETYPE. The RETTYPE (a TYPE)
3947 and ARGTYPES (a TREE_LIST) are the return type and arguments types
3948 for the method. An implicit additional parameter (of type
3949 pointer-to-BASETYPE) is added to the ARGTYPES. */
3952 build_method_type_directly (tree basetype,
3960 /* Make a node of the sort we want. */
3961 t = make_node (METHOD_TYPE);
3963 TYPE_METHOD_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
3964 TREE_TYPE (t) = rettype;
3965 ptype = build_pointer_type (basetype);
3967 /* The actual arglist for this function includes a "hidden" argument
3968 which is "this". Put it into the list of argument types. */
3969 argtypes = tree_cons (NULL_TREE, ptype, argtypes);
3970 TYPE_ARG_TYPES (t) = argtypes;
3972 /* If we already have such a type, use the old one and free this one.
3973 Note that it also frees up the above cons cell if found. */
3974 hashcode = TYPE_HASH (basetype) + TYPE_HASH (rettype) +
3975 type_hash_list (argtypes);
3977 t = type_hash_canon (hashcode, t);
3979 if (!COMPLETE_TYPE_P (t))
3985 /* Construct, lay out and return the type of methods belonging to class
3986 BASETYPE and whose arguments and values are described by TYPE.
3987 If that type exists already, reuse it.
3988 TYPE must be a FUNCTION_TYPE node. */
3991 build_method_type (tree basetype, tree type)
3993 if (TREE_CODE (type) != FUNCTION_TYPE)
3996 return build_method_type_directly (basetype,
3998 TYPE_ARG_TYPES (type));
4001 /* Construct, lay out and return the type of offsets to a value
4002 of type TYPE, within an object of type BASETYPE.
4003 If a suitable offset type exists already, reuse it. */
4006 build_offset_type (tree basetype, tree type)
4009 unsigned int hashcode;
4011 /* Make a node of the sort we want. */
4012 t = make_node (OFFSET_TYPE);
4014 TYPE_OFFSET_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
4015 TREE_TYPE (t) = type;
4017 /* If we already have such a type, use the old one and free this one. */
4018 hashcode = TYPE_HASH (basetype) + TYPE_HASH (type);
4019 t = type_hash_canon (hashcode, t);
4021 if (!COMPLETE_TYPE_P (t))
4027 /* Create a complex type whose components are COMPONENT_TYPE. */
4030 build_complex_type (tree component_type)
4033 unsigned int hashcode;
4035 /* Make a node of the sort we want. */
4036 t = make_node (COMPLEX_TYPE);
4038 TREE_TYPE (t) = TYPE_MAIN_VARIANT (component_type);
4039 set_type_quals (t, TYPE_QUALS (component_type));
4041 /* If we already have such a type, use the old one and free this one. */
4042 hashcode = TYPE_HASH (component_type);
4043 t = type_hash_canon (hashcode, t);
4045 if (!COMPLETE_TYPE_P (t))
4048 /* If we are writing Dwarf2 output we need to create a name,
4049 since complex is a fundamental type. */
4050 if ((write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4054 if (component_type == char_type_node)
4055 name = "complex char";
4056 else if (component_type == signed_char_type_node)
4057 name = "complex signed char";
4058 else if (component_type == unsigned_char_type_node)
4059 name = "complex unsigned char";
4060 else if (component_type == short_integer_type_node)
4061 name = "complex short int";
4062 else if (component_type == short_unsigned_type_node)
4063 name = "complex short unsigned int";
4064 else if (component_type == integer_type_node)
4065 name = "complex int";
4066 else if (component_type == unsigned_type_node)
4067 name = "complex unsigned int";
4068 else if (component_type == long_integer_type_node)
4069 name = "complex long int";
4070 else if (component_type == long_unsigned_type_node)
4071 name = "complex long unsigned int";
4072 else if (component_type == long_long_integer_type_node)
4073 name = "complex long long int";
4074 else if (component_type == long_long_unsigned_type_node)
4075 name = "complex long long unsigned int";
4080 TYPE_NAME (t) = get_identifier (name);
4086 /* Return OP, stripped of any conversions to wider types as much as is safe.
4087 Converting the value back to OP's type makes a value equivalent to OP.
4089 If FOR_TYPE is nonzero, we return a value which, if converted to
4090 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
4092 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
4093 narrowest type that can hold the value, even if they don't exactly fit.
4094 Otherwise, bit-field references are changed to a narrower type
4095 only if they can be fetched directly from memory in that type.
4097 OP must have integer, real or enumeral type. Pointers are not allowed!
4099 There are some cases where the obvious value we could return
4100 would regenerate to OP if converted to OP's type,
4101 but would not extend like OP to wider types.
4102 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
4103 For example, if OP is (unsigned short)(signed char)-1,
4104 we avoid returning (signed char)-1 if FOR_TYPE is int,
4105 even though extending that to an unsigned short would regenerate OP,
4106 since the result of extending (signed char)-1 to (int)
4107 is different from (int) OP. */
4110 get_unwidened (tree op, tree for_type)
4112 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
4113 tree type = TREE_TYPE (op);
4115 = TYPE_PRECISION (for_type != 0 ? for_type : type);
4117 = (for_type != 0 && for_type != type
4118 && final_prec > TYPE_PRECISION (type)
4119 && TREE_UNSIGNED (type));
4122 while (TREE_CODE (op) == NOP_EXPR)
4125 = TYPE_PRECISION (TREE_TYPE (op))
4126 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0)));
4128 /* Truncations are many-one so cannot be removed.
4129 Unless we are later going to truncate down even farther. */
4131 && final_prec > TYPE_PRECISION (TREE_TYPE (op)))
4134 /* See what's inside this conversion. If we decide to strip it,
4136 op = TREE_OPERAND (op, 0);
4138 /* If we have not stripped any zero-extensions (uns is 0),
4139 we can strip any kind of extension.
4140 If we have previously stripped a zero-extension,
4141 only zero-extensions can safely be stripped.
4142 Any extension can be stripped if the bits it would produce
4143 are all going to be discarded later by truncating to FOR_TYPE. */
4147 if (! uns || final_prec <= TYPE_PRECISION (TREE_TYPE (op)))
4149 /* TREE_UNSIGNED says whether this is a zero-extension.
4150 Let's avoid computing it if it does not affect WIN
4151 and if UNS will not be needed again. */
4152 if ((uns || TREE_CODE (op) == NOP_EXPR)
4153 && TREE_UNSIGNED (TREE_TYPE (op)))
4161 if (TREE_CODE (op) == COMPONENT_REF
4162 /* Since type_for_size always gives an integer type. */
4163 && TREE_CODE (type) != REAL_TYPE
4164 /* Don't crash if field not laid out yet. */
4165 && DECL_SIZE (TREE_OPERAND (op, 1)) != 0
4166 && host_integerp (DECL_SIZE (TREE_OPERAND (op, 1)), 1))
4168 unsigned int innerprec
4169 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op, 1)), 1);
4170 int unsignedp = (TREE_UNSIGNED (TREE_OPERAND (op, 1))
4171 || TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op, 1))));
4172 type = (*lang_hooks.types.type_for_size) (innerprec, unsignedp);
4174 /* We can get this structure field in the narrowest type it fits in.
4175 If FOR_TYPE is 0, do this only for a field that matches the
4176 narrower type exactly and is aligned for it
4177 The resulting extension to its nominal type (a fullword type)
4178 must fit the same conditions as for other extensions. */
4181 && INT_CST_LT_UNSIGNED (TYPE_SIZE (type), TYPE_SIZE (TREE_TYPE (op)))
4182 && (for_type || ! DECL_BIT_FIELD (TREE_OPERAND (op, 1)))
4183 && (! uns || final_prec <= innerprec || unsignedp))
4185 win = build (COMPONENT_REF, type, TREE_OPERAND (op, 0),
4186 TREE_OPERAND (op, 1));
4187 TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op);
4188 TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op);
4195 /* Return OP or a simpler expression for a narrower value
4196 which can be sign-extended or zero-extended to give back OP.
4197 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
4198 or 0 if the value should be sign-extended. */
4201 get_narrower (tree op, int *unsignedp_ptr)
4207 while (TREE_CODE (op) == NOP_EXPR)
4210 = (TYPE_PRECISION (TREE_TYPE (op))
4211 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0))));
4213 /* Truncations are many-one so cannot be removed. */
4217 /* See what's inside this conversion. If we decide to strip it,
4222 op = TREE_OPERAND (op, 0);
4223 /* An extension: the outermost one can be stripped,
4224 but remember whether it is zero or sign extension. */
4226 uns = TREE_UNSIGNED (TREE_TYPE (op));
4227 /* Otherwise, if a sign extension has been stripped,
4228 only sign extensions can now be stripped;
4229 if a zero extension has been stripped, only zero-extensions. */
4230 else if (uns != TREE_UNSIGNED (TREE_TYPE (op)))
4234 else /* bitschange == 0 */
4236 /* A change in nominal type can always be stripped, but we must
4237 preserve the unsignedness. */
4239 uns = TREE_UNSIGNED (TREE_TYPE (op));
4241 op = TREE_OPERAND (op, 0);
4247 if (TREE_CODE (op) == COMPONENT_REF
4248 /* Since type_for_size always gives an integer type. */
4249 && TREE_CODE (TREE_TYPE (op)) != REAL_TYPE
4250 /* Ensure field is laid out already. */
4251 && DECL_SIZE (TREE_OPERAND (op, 1)) != 0)
4253 unsigned HOST_WIDE_INT innerprec
4254 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op, 1)), 1);
4255 int unsignedp = (TREE_UNSIGNED (TREE_OPERAND (op, 1))
4256 || TREE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op, 1))));
4257 tree type = (*lang_hooks.types.type_for_size) (innerprec, unsignedp);
4259 /* We can get this structure field in a narrower type that fits it,
4260 but the resulting extension to its nominal type (a fullword type)
4261 must satisfy the same conditions as for other extensions.
4263 Do this only for fields that are aligned (not bit-fields),
4264 because when bit-field insns will be used there is no
4265 advantage in doing this. */
4267 if (innerprec < TYPE_PRECISION (TREE_TYPE (op))
4268 && ! DECL_BIT_FIELD (TREE_OPERAND (op, 1))
4269 && (first || uns == TREE_UNSIGNED (TREE_OPERAND (op, 1)))
4273 uns = TREE_UNSIGNED (TREE_OPERAND (op, 1));
4274 win = build (COMPONENT_REF, type, TREE_OPERAND (op, 0),
4275 TREE_OPERAND (op, 1));
4276 TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op);
4277 TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op);
4280 *unsignedp_ptr = uns;
4284 /* Nonzero if integer constant C has a value that is permissible
4285 for type TYPE (an INTEGER_TYPE). */
4288 int_fits_type_p (tree c, tree type)
4290 tree type_low_bound = TYPE_MIN_VALUE (type);
4291 tree type_high_bound = TYPE_MAX_VALUE (type);
4292 int ok_for_low_bound, ok_for_high_bound;
4294 /* Perform some generic filtering first, which may allow making a decision
4295 even if the bounds are not constant. First, negative integers never fit
4296 in unsigned types, */
4297 if ((TREE_UNSIGNED (type) && tree_int_cst_sgn (c) < 0)
4298 /* Also, unsigned integers with top bit set never fit signed types. */
4299 || (! TREE_UNSIGNED (type)
4300 && TREE_UNSIGNED (TREE_TYPE (c)) && tree_int_cst_msb (c)))
4303 /* If at least one bound of the type is a constant integer, we can check
4304 ourselves and maybe make a decision. If no such decision is possible, but
4305 this type is a subtype, try checking against that. Otherwise, use
4306 force_fit_type, which checks against the precision.
4308 Compute the status for each possibly constant bound, and return if we see
4309 one does not match. Use ok_for_xxx_bound for this purpose, assigning -1
4310 for "unknown if constant fits", 0 for "constant known *not* to fit" and 1
4311 for "constant known to fit". */
4313 ok_for_low_bound = -1;
4314 ok_for_high_bound = -1;
4316 /* Check if C >= type_low_bound. */
4317 if (type_low_bound && TREE_CODE (type_low_bound) == INTEGER_CST)
4319 ok_for_low_bound = ! tree_int_cst_lt (c, type_low_bound);
4320 if (! ok_for_low_bound)
4324 /* Check if c <= type_high_bound. */
4325 if (type_high_bound && TREE_CODE (type_high_bound) == INTEGER_CST)
4327 ok_for_high_bound = ! tree_int_cst_lt (type_high_bound, c);
4328 if (! ok_for_high_bound)
4332 /* If the constant fits both bounds, the result is known. */
4333 if (ok_for_low_bound == 1 && ok_for_high_bound == 1)
4336 /* If we haven't been able to decide at this point, there nothing more we
4337 can check ourselves here. Look at the base type if we have one. */
4338 else if (TREE_CODE (type) == INTEGER_TYPE && TREE_TYPE (type) != 0)
4339 return int_fits_type_p (c, TREE_TYPE (type));
4341 /* Or to force_fit_type, if nothing else. */
4345 TREE_TYPE (c) = type;
4346 return !force_fit_type (c, 0);
4350 /* Returns true if T is, contains, or refers to a type with variable
4351 size. This concept is more general than that of C99 'variably
4352 modified types': in C99, a struct type is never variably modified
4353 because a VLA may not appear as a structure member. However, in
4356 struct S { int i[f()]; };
4358 is valid, and other languages may define similar constructs. */
4361 variably_modified_type_p (tree type)
4365 if (type == error_mark_node)
4368 /* If TYPE itself has variable size, it is variably modified.
4370 We do not yet have a representation of the C99 '[*]' syntax.
4371 When a representation is chosen, this function should be modified
4372 to test for that case as well. */
4373 t = TYPE_SIZE (type);
4374 if (t && t != error_mark_node && TREE_CODE (t) != INTEGER_CST)
4377 switch (TREE_CODE (type))
4380 case REFERENCE_TYPE:
4382 /* If TYPE is a pointer or reference, it is variably modified if
4383 the type pointed to is variably modified. Similarly for arrays;
4384 note that VLAs are handled by the TYPE_SIZE check above. */
4385 return variably_modified_type_p (TREE_TYPE (type));
4389 /* If TYPE is a function type, it is variably modified if any of the
4390 parameters or the return type are variably modified. */
4394 if (variably_modified_type_p (TREE_TYPE (type)))
4396 for (parm = TYPE_ARG_TYPES (type);
4397 parm && parm != void_list_node;
4398 parm = TREE_CHAIN (parm))
4399 if (variably_modified_type_p (TREE_VALUE (parm)))
4405 /* Scalar types are variably modified if their end points
4407 t = TYPE_MIN_VALUE (type);
4408 if (t && t != error_mark_node && TREE_CODE (t) != INTEGER_CST)
4410 t = TYPE_MAX_VALUE (type);
4411 if (t && t != error_mark_node && TREE_CODE (t) != INTEGER_CST)
4419 /* The current language may have other cases to check, but in general,
4420 all other types are not variably modified. */
4421 return (*lang_hooks.tree_inlining.var_mod_type_p) (type);
4424 /* Given a DECL or TYPE, return the scope in which it was declared, or
4425 NULL_TREE if there is no containing scope. */
4428 get_containing_scope (tree t)
4430 return (TYPE_P (t) ? TYPE_CONTEXT (t) : DECL_CONTEXT (t));
4433 /* Return the innermost context enclosing DECL that is
4434 a FUNCTION_DECL, or zero if none. */
4437 decl_function_context (tree decl)
4441 if (TREE_CODE (decl) == ERROR_MARK)
4444 if (TREE_CODE (decl) == SAVE_EXPR)
4445 context = SAVE_EXPR_CONTEXT (decl);
4447 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
4448 where we look up the function at runtime. Such functions always take
4449 a first argument of type 'pointer to real context'.
4451 C++ should really be fixed to use DECL_CONTEXT for the real context,
4452 and use something else for the "virtual context". */
4453 else if (TREE_CODE (decl) == FUNCTION_DECL && DECL_VINDEX (decl))
4456 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)))));
4458 context = DECL_CONTEXT (decl);
4460 while (context && TREE_CODE (context) != FUNCTION_DECL)
4462 if (TREE_CODE (context) == BLOCK)
4463 context = BLOCK_SUPERCONTEXT (context);
4465 context = get_containing_scope (context);
4471 /* Return the innermost context enclosing DECL that is
4472 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
4473 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
4476 decl_type_context (tree decl)
4478 tree context = DECL_CONTEXT (decl);
4481 switch (TREE_CODE (context))
4483 case NAMESPACE_DECL:
4484 case TRANSLATION_UNIT_DECL:
4489 case QUAL_UNION_TYPE:
4494 context = DECL_CONTEXT (context);
4498 context = BLOCK_SUPERCONTEXT (context);
4508 /* CALL is a CALL_EXPR. Return the declaration for the function
4509 called, or NULL_TREE if the called function cannot be
4513 get_callee_fndecl (tree call)
4517 /* It's invalid to call this function with anything but a
4519 if (TREE_CODE (call) != CALL_EXPR)
4522 /* The first operand to the CALL is the address of the function
4524 addr = TREE_OPERAND (call, 0);
4528 /* If this is a readonly function pointer, extract its initial value. */
4529 if (DECL_P (addr) && TREE_CODE (addr) != FUNCTION_DECL
4530 && TREE_READONLY (addr) && ! TREE_THIS_VOLATILE (addr)
4531 && DECL_INITIAL (addr))
4532 addr = DECL_INITIAL (addr);
4534 /* If the address is just `&f' for some function `f', then we know
4535 that `f' is being called. */
4536 if (TREE_CODE (addr) == ADDR_EXPR
4537 && TREE_CODE (TREE_OPERAND (addr, 0)) == FUNCTION_DECL)
4538 return TREE_OPERAND (addr, 0);
4540 /* We couldn't figure out what was being called. Maybe the front
4541 end has some idea. */
4542 return (*lang_hooks.lang_get_callee_fndecl) (call);
4545 /* Print debugging information about tree nodes generated during the compile,
4546 and any language-specific information. */
4549 dump_tree_statistics (void)
4551 #ifdef GATHER_STATISTICS
4553 int total_nodes, total_bytes;
4556 fprintf (stderr, "\n??? tree nodes created\n\n");
4557 #ifdef GATHER_STATISTICS
4558 fprintf (stderr, "Kind Nodes Bytes\n");
4559 fprintf (stderr, "---------------------------------------\n");
4560 total_nodes = total_bytes = 0;
4561 for (i = 0; i < (int) all_kinds; i++)
4563 fprintf (stderr, "%-20s %7d %10d\n", tree_node_kind_names[i],
4564 tree_node_counts[i], tree_node_sizes[i]);
4565 total_nodes += tree_node_counts[i];
4566 total_bytes += tree_node_sizes[i];
4568 fprintf (stderr, "---------------------------------------\n");
4569 fprintf (stderr, "%-20s %7d %10d\n", "Total", total_nodes, total_bytes);
4570 fprintf (stderr, "---------------------------------------\n");
4572 fprintf (stderr, "(No per-node statistics)\n");
4574 print_type_hash_statistics ();
4575 (*lang_hooks.print_statistics) ();
4578 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
4580 /* Generate a crc32 of a string. */
4583 crc32_string (unsigned chksum, const char *string)
4587 unsigned value = *string << 24;
4590 for (ix = 8; ix--; value <<= 1)
4594 feedback = (value ^ chksum) & 0x80000000 ? 0x04c11db7 : 0;
4603 /* P is a string that will be used in a symbol. Mask out any characters
4604 that are not valid in that context. */
4607 clean_symbol_name (char *p)
4611 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
4614 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
4621 /* Generate a name for a function unique to this translation unit.
4622 TYPE is some string to identify the purpose of this function to the
4623 linker or collect2. */
4626 get_file_function_name_long (const char *type)
4632 if (first_global_object_name)
4633 p = first_global_object_name;
4636 /* We don't have anything that we know to be unique to this translation
4637 unit, so use what we do have and throw in some randomness. */
4639 const char *name = weak_global_object_name;
4640 const char *file = main_input_filename;
4645 file = input_filename;
4647 len = strlen (file);
4648 q = alloca (9 * 2 + len + 1);
4649 memcpy (q, file, len + 1);
4650 clean_symbol_name (q);
4652 sprintf (q + len, "_%08X_%08X", crc32_string (0, name),
4653 crc32_string (0, flag_random_seed));
4658 buf = alloca (sizeof (FILE_FUNCTION_FORMAT) + strlen (p) + strlen (type));
4660 /* Set up the name of the file-level functions we may need.
4661 Use a global object (which is already required to be unique over
4662 the program) rather than the file name (which imposes extra
4664 sprintf (buf, FILE_FUNCTION_FORMAT, type, p);
4666 return get_identifier (buf);
4669 /* If KIND=='I', return a suitable global initializer (constructor) name.
4670 If KIND=='D', return a suitable global clean-up (destructor) name. */
4673 get_file_function_name (int kind)
4680 return get_file_function_name_long (p);
4683 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
4684 The result is placed in BUFFER (which has length BIT_SIZE),
4685 with one bit in each char ('\000' or '\001').
4687 If the constructor is constant, NULL_TREE is returned.
4688 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
4691 get_set_constructor_bits (tree init, char *buffer, int bit_size)
4695 HOST_WIDE_INT domain_min
4696 = tree_low_cst (TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (init))), 0);
4697 tree non_const_bits = NULL_TREE;
4699 for (i = 0; i < bit_size; i++)
4702 for (vals = TREE_OPERAND (init, 1);
4703 vals != NULL_TREE; vals = TREE_CHAIN (vals))
4705 if (!host_integerp (TREE_VALUE (vals), 0)
4706 || (TREE_PURPOSE (vals) != NULL_TREE
4707 && !host_integerp (TREE_PURPOSE (vals), 0)))
4709 = tree_cons (TREE_PURPOSE (vals), TREE_VALUE (vals), non_const_bits);
4710 else if (TREE_PURPOSE (vals) != NULL_TREE)
4712 /* Set a range of bits to ones. */
4713 HOST_WIDE_INT lo_index
4714 = tree_low_cst (TREE_PURPOSE (vals), 0) - domain_min;
4715 HOST_WIDE_INT hi_index
4716 = tree_low_cst (TREE_VALUE (vals), 0) - domain_min;
4718 if (lo_index < 0 || lo_index >= bit_size
4719 || hi_index < 0 || hi_index >= bit_size)
4721 for (; lo_index <= hi_index; lo_index++)
4722 buffer[lo_index] = 1;
4726 /* Set a single bit to one. */
4728 = tree_low_cst (TREE_VALUE (vals), 0) - domain_min;
4729 if (index < 0 || index >= bit_size)
4731 error ("invalid initializer for bit string");
4737 return non_const_bits;
4740 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
4741 The result is placed in BUFFER (which is an array of bytes).
4742 If the constructor is constant, NULL_TREE is returned.
4743 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
4746 get_set_constructor_bytes (tree init, unsigned char *buffer, int wd_size)
4749 int set_word_size = BITS_PER_UNIT;
4750 int bit_size = wd_size * set_word_size;
4752 unsigned char *bytep = buffer;
4753 char *bit_buffer = alloca (bit_size);
4754 tree non_const_bits = get_set_constructor_bits (init, bit_buffer, bit_size);
4756 for (i = 0; i < wd_size; i++)
4759 for (i = 0; i < bit_size; i++)
4763 if (BYTES_BIG_ENDIAN)
4764 *bytep |= (1 << (set_word_size - 1 - bit_pos));
4766 *bytep |= 1 << bit_pos;
4769 if (bit_pos >= set_word_size)
4770 bit_pos = 0, bytep++;
4772 return non_const_bits;
4775 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
4776 /* Complain that the tree code of NODE does not match the expected CODE.
4777 FILE, LINE, and FUNCTION are of the caller. */
4780 tree_check_failed (const tree node, enum tree_code code, const char *file,
4781 int line, const char *function)
4783 internal_error ("tree check: expected %s, have %s in %s, at %s:%d",
4784 tree_code_name[code], tree_code_name[TREE_CODE (node)],
4785 function, trim_filename (file), line);
4788 /* Similar to above, except that we check for a class of tree
4789 code, given in CL. */
4792 tree_class_check_failed (const tree node, int cl, const char *file,
4793 int line, const char *function)
4796 ("tree check: expected class '%c', have '%c' (%s) in %s, at %s:%d",
4797 cl, TREE_CODE_CLASS (TREE_CODE (node)),
4798 tree_code_name[TREE_CODE (node)], function, trim_filename (file), line);
4801 /* Similar to above, except that the check is for the bounds of a TREE_VEC's
4802 (dynamically sized) vector. */
4805 tree_vec_elt_check_failed (int idx, int len, const char *file, int line,
4806 const char *function)
4809 ("tree check: accessed elt %d of tree_vec with %d elts in %s, at %s:%d",
4810 idx + 1, len, function, trim_filename (file), line);
4813 /* Similar to above, except that the check is for the bounds of the operand
4814 vector of an expression node. */
4817 tree_operand_check_failed (int idx, enum tree_code code, const char *file,
4818 int line, const char *function)
4821 ("tree check: accessed operand %d of %s with %d operands in %s, at %s:%d",
4822 idx + 1, tree_code_name[code], TREE_CODE_LENGTH (code),
4823 function, trim_filename (file), line);
4825 #endif /* ENABLE_TREE_CHECKING */
4827 /* For a new vector type node T, build the information necessary for
4828 debugging output. */
4831 finish_vector_type (tree t)
4836 tree index = build_int_2 (TYPE_VECTOR_SUBPARTS (t) - 1, 0);
4837 tree array = build_array_type (TREE_TYPE (t),
4838 build_index_type (index));
4839 tree rt = make_node (RECORD_TYPE);
4841 TYPE_FIELDS (rt) = build_decl (FIELD_DECL, get_identifier ("f"), array);
4842 DECL_CONTEXT (TYPE_FIELDS (rt)) = rt;
4844 TYPE_DEBUG_REPRESENTATION_TYPE (t) = rt;
4845 /* In dwarfout.c, type lookup uses TYPE_UID numbers. We want to output
4846 the representation type, and we want to find that die when looking up
4847 the vector type. This is most easily achieved by making the TYPE_UID
4849 TYPE_UID (rt) = TYPE_UID (t);
4853 /* Create nodes for all integer types (and error_mark_node) using the sizes
4854 of C datatypes. The caller should call set_sizetype soon after calling
4855 this function to select one of the types as sizetype. */
4858 build_common_tree_nodes (int signed_char)
4860 error_mark_node = make_node (ERROR_MARK);
4861 TREE_TYPE (error_mark_node) = error_mark_node;
4863 initialize_sizetypes ();
4865 /* Define both `signed char' and `unsigned char'. */
4866 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
4867 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
4869 /* Define `char', which is like either `signed char' or `unsigned char'
4870 but not the same as either. */
4873 ? make_signed_type (CHAR_TYPE_SIZE)
4874 : make_unsigned_type (CHAR_TYPE_SIZE));
4876 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
4877 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
4878 integer_type_node = make_signed_type (INT_TYPE_SIZE);
4879 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
4880 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
4881 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
4882 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
4883 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
4885 /* Define a boolean type. This type only represents boolean values but
4886 may be larger than char depending on the value of BOOL_TYPE_SIZE.
4887 Front ends which want to override this size (i.e. Java) can redefine
4888 boolean_type_node before calling build_common_tree_nodes_2. */
4889 boolean_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
4890 TREE_SET_CODE (boolean_type_node, BOOLEAN_TYPE);
4891 TYPE_MAX_VALUE (boolean_type_node) = build_int_2 (1, 0);
4892 TREE_TYPE (TYPE_MAX_VALUE (boolean_type_node)) = boolean_type_node;
4893 TYPE_PRECISION (boolean_type_node) = 1;
4895 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
4896 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
4897 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
4898 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
4899 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
4901 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
4902 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
4903 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
4904 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
4905 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
4907 access_public_node = get_identifier ("public");
4908 access_protected_node = get_identifier ("protected");
4909 access_private_node = get_identifier ("private");
4912 /* Call this function after calling build_common_tree_nodes and set_sizetype.
4913 It will create several other common tree nodes. */
4916 build_common_tree_nodes_2 (int short_double)
4918 /* Define these next since types below may used them. */
4919 integer_zero_node = build_int_2 (0, 0);
4920 integer_one_node = build_int_2 (1, 0);
4921 integer_minus_one_node = build_int_2 (-1, -1);
4923 size_zero_node = size_int (0);
4924 size_one_node = size_int (1);
4925 bitsize_zero_node = bitsize_int (0);
4926 bitsize_one_node = bitsize_int (1);
4927 bitsize_unit_node = bitsize_int (BITS_PER_UNIT);
4929 boolean_false_node = TYPE_MIN_VALUE (boolean_type_node);
4930 boolean_true_node = TYPE_MAX_VALUE (boolean_type_node);
4932 void_type_node = make_node (VOID_TYPE);
4933 layout_type (void_type_node);
4935 /* We are not going to have real types in C with less than byte alignment,
4936 so we might as well not have any types that claim to have it. */
4937 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
4938 TYPE_USER_ALIGN (void_type_node) = 0;
4940 null_pointer_node = build_int_2 (0, 0);
4941 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
4942 layout_type (TREE_TYPE (null_pointer_node));
4944 ptr_type_node = build_pointer_type (void_type_node);
4946 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
4948 float_type_node = make_node (REAL_TYPE);
4949 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
4950 layout_type (float_type_node);
4952 double_type_node = make_node (REAL_TYPE);
4954 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
4956 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
4957 layout_type (double_type_node);
4959 long_double_type_node = make_node (REAL_TYPE);
4960 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
4961 layout_type (long_double_type_node);
4963 float_ptr_type_node = build_pointer_type (float_type_node);
4964 double_ptr_type_node = build_pointer_type (double_type_node);
4965 long_double_ptr_type_node = build_pointer_type (long_double_type_node);
4966 integer_ptr_type_node = build_pointer_type (integer_type_node);
4968 complex_integer_type_node = make_node (COMPLEX_TYPE);
4969 TREE_TYPE (complex_integer_type_node) = integer_type_node;
4970 layout_type (complex_integer_type_node);
4972 complex_float_type_node = make_node (COMPLEX_TYPE);
4973 TREE_TYPE (complex_float_type_node) = float_type_node;
4974 layout_type (complex_float_type_node);
4976 complex_double_type_node = make_node (COMPLEX_TYPE);
4977 TREE_TYPE (complex_double_type_node) = double_type_node;
4978 layout_type (complex_double_type_node);
4980 complex_long_double_type_node = make_node (COMPLEX_TYPE);
4981 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
4982 layout_type (complex_long_double_type_node);
4985 tree t = (*targetm.build_builtin_va_list) ();
4987 /* Many back-ends define record types without setting TYPE_NAME.
4988 If we copied the record type here, we'd keep the original
4989 record type without a name. This breaks name mangling. So,
4990 don't copy record types and let c_common_nodes_and_builtins()
4991 declare the type to be __builtin_va_list. */
4992 if (TREE_CODE (t) != RECORD_TYPE)
4993 t = build_type_copy (t);
4995 va_list_type_node = t;
4998 unsigned_V4SI_type_node
4999 = make_vector (V4SImode, unsigned_intSI_type_node, 1);
5000 unsigned_V2HI_type_node
5001 = make_vector (V2HImode, unsigned_intHI_type_node, 1);
5002 unsigned_V2SI_type_node
5003 = make_vector (V2SImode, unsigned_intSI_type_node, 1);
5004 unsigned_V2DI_type_node
5005 = make_vector (V2DImode, unsigned_intDI_type_node, 1);
5006 unsigned_V4HI_type_node
5007 = make_vector (V4HImode, unsigned_intHI_type_node, 1);
5008 unsigned_V8QI_type_node
5009 = make_vector (V8QImode, unsigned_intQI_type_node, 1);
5010 unsigned_V8HI_type_node
5011 = make_vector (V8HImode, unsigned_intHI_type_node, 1);
5012 unsigned_V16QI_type_node
5013 = make_vector (V16QImode, unsigned_intQI_type_node, 1);
5014 unsigned_V1DI_type_node
5015 = make_vector (V1DImode, unsigned_intDI_type_node, 1);
5017 V16SF_type_node = make_vector (V16SFmode, float_type_node, 0);
5018 V4SF_type_node = make_vector (V4SFmode, float_type_node, 0);
5019 V4SI_type_node = make_vector (V4SImode, intSI_type_node, 0);
5020 V2HI_type_node = make_vector (V2HImode, intHI_type_node, 0);
5021 V2SI_type_node = make_vector (V2SImode, intSI_type_node, 0);
5022 V2DI_type_node = make_vector (V2DImode, intDI_type_node, 0);
5023 V4HI_type_node = make_vector (V4HImode, intHI_type_node, 0);
5024 V8QI_type_node = make_vector (V8QImode, intQI_type_node, 0);
5025 V8HI_type_node = make_vector (V8HImode, intHI_type_node, 0);
5026 V2SF_type_node = make_vector (V2SFmode, float_type_node, 0);
5027 V2DF_type_node = make_vector (V2DFmode, double_type_node, 0);
5028 V16QI_type_node = make_vector (V16QImode, intQI_type_node, 0);
5029 V1DI_type_node = make_vector (V1DImode, intDI_type_node, 0);
5030 V4DF_type_node = make_vector (V4DFmode, double_type_node, 0);
5033 /* Returns a vector tree node given a vector mode, the inner type, and
5037 make_vector (enum machine_mode mode, tree innertype, int unsignedp)
5041 t = make_node (VECTOR_TYPE);
5042 TREE_TYPE (t) = innertype;
5043 TYPE_MODE (t) = mode;
5044 TREE_UNSIGNED (TREE_TYPE (t)) = unsignedp;
5045 finish_vector_type (t);
5050 /* Given an initializer INIT, return TRUE if INIT is zero or some
5051 aggregate of zeros. Otherwise return FALSE. */
5054 initializer_zerop (tree init)
5058 switch (TREE_CODE (init))
5061 return integer_zerop (init);
5063 return real_zerop (init)
5064 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (init));
5066 return integer_zerop (init)
5067 || (real_zerop (init)
5068 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_REALPART (init)))
5069 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_IMAGPART (init))));
5072 /* Set is empty if it has no elements. */
5073 if ((TREE_CODE (TREE_TYPE (init)) == SET_TYPE)
5074 && CONSTRUCTOR_ELTS (init))
5077 if (AGGREGATE_TYPE_P (TREE_TYPE (init)))
5079 tree aggr_init = CONSTRUCTOR_ELTS (init);
5083 if (! initializer_zerop (TREE_VALUE (aggr_init)))
5085 aggr_init = TREE_CHAIN (aggr_init);
5096 #include "gt-tree.h"