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"
48 #include "tree-iterator.h"
49 #include "basic-block.h"
50 #include "tree-flow.h"
53 /* obstack.[ch] explicitly declined to prototype this. */
54 extern int _obstack_allocated_p (struct obstack *h, void *obj);
56 #ifdef GATHER_STATISTICS
57 /* Statistics-gathering stuff. */
59 int tree_node_counts[(int) all_kinds];
60 int tree_node_sizes[(int) all_kinds];
62 /* Keep in sync with tree.h:enum tree_node_kind. */
63 static const char * const tree_node_kind_names[] = {
82 #endif /* GATHER_STATISTICS */
84 /* Unique id for next decl created. */
85 static GTY(()) int next_decl_uid;
86 /* Unique id for next type created. */
87 static GTY(()) int next_type_uid = 1;
89 /* Since we cannot rehash a type after it is in the table, we have to
90 keep the hash code. */
92 struct type_hash GTY(())
98 /* Initial size of the hash table (rounded to next prime). */
99 #define TYPE_HASH_INITIAL_SIZE 1000
101 /* Now here is the hash table. When recording a type, it is added to
102 the slot whose index is the hash code. Note that the hash table is
103 used for several kinds of types (function types, array types and
104 array index range types, for now). While all these live in the
105 same table, they are completely independent, and the hash code is
106 computed differently for each of these. */
108 static GTY ((if_marked ("type_hash_marked_p"), param_is (struct type_hash)))
109 htab_t type_hash_table;
111 static void set_type_quals (tree, int);
112 static int type_hash_eq (const void *, const void *);
113 static hashval_t type_hash_hash (const void *);
114 static void print_type_hash_statistics (void);
115 static tree make_vector_type (tree, int, enum machine_mode);
116 static int type_hash_marked_p (const void *);
117 static unsigned int type_hash_list (tree, hashval_t);
118 static unsigned int attribute_hash_list (tree, hashval_t);
120 tree global_trees[TI_MAX];
121 tree integer_types[itk_none];
128 /* Initialize the hash table of types. */
129 type_hash_table = htab_create_ggc (TYPE_HASH_INITIAL_SIZE, type_hash_hash,
134 /* The name of the object as the assembler will see it (but before any
135 translations made by ASM_OUTPUT_LABELREF). Often this is the same
136 as DECL_NAME. It is an IDENTIFIER_NODE. */
138 decl_assembler_name (tree decl)
140 if (!DECL_ASSEMBLER_NAME_SET_P (decl))
141 lang_hooks.set_decl_assembler_name (decl);
142 return DECL_CHECK (decl)->decl.assembler_name;
145 /* Compute the number of bytes occupied by 'node'. This routine only
146 looks at TREE_CODE and, if the code is TREE_VEC, TREE_VEC_LENGTH. */
148 tree_size (tree node)
150 enum tree_code code = TREE_CODE (node);
152 switch (TREE_CODE_CLASS (code))
154 case 'd': /* A decl node */
155 return sizeof (struct tree_decl);
157 case 't': /* a type node */
158 return sizeof (struct tree_type);
160 case 'r': /* a reference */
161 case 'e': /* an expression */
162 case 's': /* an expression with side effects */
163 case '<': /* a comparison expression */
164 case '1': /* a unary arithmetic expression */
165 case '2': /* a binary arithmetic expression */
166 return (sizeof (struct tree_exp)
167 + TREE_CODE_LENGTH (code) * sizeof (char *) - sizeof (char *));
169 case 'c': /* a constant */
172 case INTEGER_CST: return sizeof (struct tree_int_cst);
173 case REAL_CST: return sizeof (struct tree_real_cst);
174 case COMPLEX_CST: return sizeof (struct tree_complex);
175 case VECTOR_CST: return sizeof (struct tree_vector);
176 case STRING_CST: return sizeof (struct tree_string);
178 return lang_hooks.tree_size (code);
181 case 'x': /* something random, like an identifier. */
184 case IDENTIFIER_NODE: return lang_hooks.identifier_size;
185 case TREE_LIST: return sizeof (struct tree_list);
186 case TREE_VEC: return (sizeof (struct tree_vec)
187 + TREE_VEC_LENGTH(node) * sizeof(char *)
191 case PLACEHOLDER_EXPR: return sizeof (struct tree_common);
193 case PHI_NODE: return (sizeof (struct tree_phi_node)
194 + (PHI_ARG_CAPACITY (node) - 1) *
195 sizeof (struct phi_arg_d));
197 case SSA_NAME: return sizeof (struct tree_ssa_name);
199 case STATEMENT_LIST: return sizeof (struct tree_statement_list);
200 case BLOCK: return sizeof (struct tree_block);
201 case VALUE_HANDLE: return sizeof (struct tree_value_handle);
204 return lang_hooks.tree_size (code);
212 /* Return a newly allocated node of code CODE.
213 For decl and type nodes, some other fields are initialized.
214 The rest of the node is initialized to zero.
216 Achoo! I got a code in the node. */
219 make_node_stat (enum tree_code code MEM_STAT_DECL)
222 int type = TREE_CODE_CLASS (code);
224 #ifdef GATHER_STATISTICS
227 struct tree_common ttmp;
229 /* We can't allocate a TREE_VEC, PHI_NODE, or STRING_CST
230 without knowing how many elements it will have. */
231 if (code == TREE_VEC || code == PHI_NODE)
234 TREE_SET_CODE ((tree)&ttmp, code);
235 length = tree_size ((tree)&ttmp);
237 #ifdef GATHER_STATISTICS
240 case 'd': /* A decl node */
244 case 't': /* a type node */
248 case 's': /* an expression with side effects */
252 case 'r': /* a reference */
256 case 'e': /* an expression */
257 case '<': /* a comparison expression */
258 case '1': /* a unary arithmetic expression */
259 case '2': /* a binary arithmetic expression */
263 case 'c': /* a constant */
267 case 'x': /* something random, like an identifier. */
268 if (code == IDENTIFIER_NODE)
270 else if (code == TREE_VEC)
272 else if (code == TREE_BINFO)
274 else if (code == PHI_NODE)
276 else if (code == SSA_NAME)
277 kind = ssa_name_kind;
278 else if (code == BLOCK)
288 tree_node_counts[(int) kind]++;
289 tree_node_sizes[(int) kind] += length;
292 t = ggc_alloc_zone_stat (length, tree_zone PASS_MEM_STAT);
294 memset (t, 0, length);
296 TREE_SET_CODE (t, code);
301 TREE_SIDE_EFFECTS (t) = 1;
305 if (code != FUNCTION_DECL)
307 DECL_USER_ALIGN (t) = 0;
308 DECL_IN_SYSTEM_HEADER (t) = in_system_header;
309 DECL_SOURCE_LOCATION (t) = input_location;
310 DECL_UID (t) = next_decl_uid++;
312 /* We have not yet computed the alias set for this declaration. */
313 DECL_POINTER_ALIAS_SET (t) = -1;
317 TYPE_UID (t) = next_type_uid++;
318 TYPE_ALIGN (t) = char_type_node ? TYPE_ALIGN (char_type_node) : 0;
319 TYPE_USER_ALIGN (t) = 0;
320 TYPE_MAIN_VARIANT (t) = t;
322 /* Default to no attributes for type, but let target change that. */
323 TYPE_ATTRIBUTES (t) = NULL_TREE;
324 targetm.set_default_type_attributes (t);
326 /* We have not yet computed the alias set for this type. */
327 TYPE_ALIAS_SET (t) = -1;
331 TREE_CONSTANT (t) = 1;
332 TREE_INVARIANT (t) = 1;
341 case PREDECREMENT_EXPR:
342 case PREINCREMENT_EXPR:
343 case POSTDECREMENT_EXPR:
344 case POSTINCREMENT_EXPR:
345 /* All of these have side-effects, no matter what their
347 TREE_SIDE_EFFECTS (t) = 1;
359 /* Return a new node with the same contents as NODE except that its
360 TREE_CHAIN is zero and it has a fresh uid. */
363 copy_node_stat (tree node MEM_STAT_DECL)
366 enum tree_code code = TREE_CODE (node);
369 #ifdef ENABLE_CHECKING
370 if (code == STATEMENT_LIST)
374 length = tree_size (node);
375 t = ggc_alloc_zone_stat (length, tree_zone PASS_MEM_STAT);
376 memcpy (t, node, length);
379 TREE_ASM_WRITTEN (t) = 0;
380 TREE_VISITED (t) = 0;
383 if (TREE_CODE_CLASS (code) == 'd')
384 DECL_UID (t) = next_decl_uid++;
385 else if (TREE_CODE_CLASS (code) == 't')
387 TYPE_UID (t) = next_type_uid++;
388 /* The following is so that the debug code for
389 the copy is different from the original type.
390 The two statements usually duplicate each other
391 (because they clear fields of the same union),
392 but the optimizer should catch that. */
393 TYPE_SYMTAB_POINTER (t) = 0;
394 TYPE_SYMTAB_ADDRESS (t) = 0;
396 /* Do not copy the values cache. */
397 if (TYPE_CACHED_VALUES_P(t))
399 TYPE_CACHED_VALUES_P (t) = 0;
400 TYPE_CACHED_VALUES (t) = NULL_TREE;
407 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
408 For example, this can copy a list made of TREE_LIST nodes. */
411 copy_list (tree list)
419 head = prev = copy_node (list);
420 next = TREE_CHAIN (list);
423 TREE_CHAIN (prev) = copy_node (next);
424 prev = TREE_CHAIN (prev);
425 next = TREE_CHAIN (next);
431 /* Create an INT_CST node with a LOW value sign extended. */
433 tree build_int_cst (tree type, HOST_WIDE_INT low)
435 return build_int_cst_wide (type, low,
439 /* Create an INT_CST node with a LOW value zero extended. */
441 tree build_int_cstu (tree type, unsigned HOST_WIDE_INT low)
443 return build_int_cst_wide (type, low, 0);
446 /* Create an INT_CST node of TYPE and value HI:LOW. If TYPE is NULL,
447 integer_type_node is used. */
450 build_int_cst_wide (tree type, unsigned HOST_WIDE_INT low, HOST_WIDE_INT hi)
457 type = integer_type_node;
459 switch (TREE_CODE (type))
463 /* Cache NULL pointer. */
472 /* Cache false or true. */
481 if (TYPE_UNSIGNED (type))
484 limit = INTEGER_SHARE_LIMIT;
485 if (!hi && low < (unsigned HOST_WIDE_INT)INTEGER_SHARE_LIMIT)
491 limit = INTEGER_SHARE_LIMIT + 1;
492 if (!hi && low < (unsigned HOST_WIDE_INT)INTEGER_SHARE_LIMIT)
494 else if (hi == -1 && low == -(unsigned HOST_WIDE_INT)1)
504 if (!TYPE_CACHED_VALUES_P (type))
506 TYPE_CACHED_VALUES_P (type) = 1;
507 TYPE_CACHED_VALUES (type) = make_tree_vec (limit);
510 t = TREE_VEC_ELT (TYPE_CACHED_VALUES (type), ix);
513 /* Make sure no one is clobbering the shared constant. */
514 if (TREE_TYPE (t) != type)
516 if (TREE_INT_CST_LOW (t) != low || TREE_INT_CST_HIGH (t) != hi)
522 t = make_node (INTEGER_CST);
524 TREE_INT_CST_LOW (t) = low;
525 TREE_INT_CST_HIGH (t) = hi;
526 TREE_TYPE (t) = type;
529 TREE_VEC_ELT (TYPE_CACHED_VALUES (type), ix) = t;
534 /* Return a new VECTOR_CST node whose type is TYPE and whose values
535 are in a list pointed by VALS. */
538 build_vector (tree type, tree vals)
540 tree v = make_node (VECTOR_CST);
541 int over1 = 0, over2 = 0;
544 TREE_VECTOR_CST_ELTS (v) = vals;
545 TREE_TYPE (v) = type;
547 /* Iterate through elements and check for overflow. */
548 for (link = vals; link; link = TREE_CHAIN (link))
550 tree value = TREE_VALUE (link);
552 over1 |= TREE_OVERFLOW (value);
553 over2 |= TREE_CONSTANT_OVERFLOW (value);
556 TREE_OVERFLOW (v) = over1;
557 TREE_CONSTANT_OVERFLOW (v) = over2;
562 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
563 are in a list pointed to by VALS. */
565 build_constructor (tree type, tree vals)
567 tree c = make_node (CONSTRUCTOR);
568 TREE_TYPE (c) = type;
569 CONSTRUCTOR_ELTS (c) = vals;
571 /* ??? May not be necessary. Mirrors what build does. */
574 TREE_SIDE_EFFECTS (c) = TREE_SIDE_EFFECTS (vals);
575 TREE_READONLY (c) = TREE_READONLY (vals);
576 TREE_CONSTANT (c) = TREE_CONSTANT (vals);
577 TREE_INVARIANT (c) = TREE_INVARIANT (vals);
583 /* Return a new REAL_CST node whose type is TYPE and value is D. */
586 build_real (tree type, REAL_VALUE_TYPE d)
592 /* ??? Used to check for overflow here via CHECK_FLOAT_TYPE.
593 Consider doing it via real_convert now. */
595 v = make_node (REAL_CST);
596 dp = ggc_alloc (sizeof (REAL_VALUE_TYPE));
597 memcpy (dp, &d, sizeof (REAL_VALUE_TYPE));
599 TREE_TYPE (v) = type;
600 TREE_REAL_CST_PTR (v) = dp;
601 TREE_OVERFLOW (v) = TREE_CONSTANT_OVERFLOW (v) = overflow;
605 /* Return a new REAL_CST node whose type is TYPE
606 and whose value is the integer value of the INTEGER_CST node I. */
609 real_value_from_int_cst (tree type, tree i)
613 /* Clear all bits of the real value type so that we can later do
614 bitwise comparisons to see if two values are the same. */
615 memset (&d, 0, sizeof d);
617 real_from_integer (&d, type ? TYPE_MODE (type) : VOIDmode,
618 TREE_INT_CST_LOW (i), TREE_INT_CST_HIGH (i),
619 TYPE_UNSIGNED (TREE_TYPE (i)));
623 /* Given a tree representing an integer constant I, return a tree
624 representing the same value as a floating-point constant of type TYPE. */
627 build_real_from_int_cst (tree type, tree i)
630 int overflow = TREE_OVERFLOW (i);
632 v = build_real (type, real_value_from_int_cst (type, i));
634 TREE_OVERFLOW (v) |= overflow;
635 TREE_CONSTANT_OVERFLOW (v) |= overflow;
639 /* Return a newly constructed STRING_CST node whose value is
640 the LEN characters at STR.
641 The TREE_TYPE is not initialized. */
644 build_string (int len, const char *str)
646 tree s = make_node (STRING_CST);
648 TREE_STRING_LENGTH (s) = len;
649 TREE_STRING_POINTER (s) = ggc_alloc_string (str, len);
654 /* Return a newly constructed COMPLEX_CST node whose value is
655 specified by the real and imaginary parts REAL and IMAG.
656 Both REAL and IMAG should be constant nodes. TYPE, if specified,
657 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
660 build_complex (tree type, tree real, tree imag)
662 tree t = make_node (COMPLEX_CST);
664 TREE_REALPART (t) = real;
665 TREE_IMAGPART (t) = imag;
666 TREE_TYPE (t) = type ? type : build_complex_type (TREE_TYPE (real));
667 TREE_OVERFLOW (t) = TREE_OVERFLOW (real) | TREE_OVERFLOW (imag);
668 TREE_CONSTANT_OVERFLOW (t)
669 = TREE_CONSTANT_OVERFLOW (real) | TREE_CONSTANT_OVERFLOW (imag);
673 /* Build a BINFO with LEN language slots. */
676 make_tree_binfo_stat (unsigned base_binfos MEM_STAT_DECL)
679 size_t length = (offsetof (struct tree_binfo, base_binfos)
680 + VEC_embedded_size (tree, base_binfos));
682 #ifdef GATHER_STATISTICS
683 tree_node_counts[(int) binfo_kind]++;
684 tree_node_sizes[(int) binfo_kind] += length;
687 t = ggc_alloc_zone_stat (length, tree_zone PASS_MEM_STAT);
689 memset (t, 0, offsetof (struct tree_binfo, base_binfos));
691 TREE_SET_CODE (t, TREE_BINFO);
693 VEC_embedded_init (tree, BINFO_BASE_BINFOS (t), base_binfos);
699 /* Build a newly constructed TREE_VEC node of length LEN. */
702 make_tree_vec_stat (int len MEM_STAT_DECL)
705 int length = (len - 1) * sizeof (tree) + sizeof (struct tree_vec);
707 #ifdef GATHER_STATISTICS
708 tree_node_counts[(int) vec_kind]++;
709 tree_node_sizes[(int) vec_kind] += length;
712 t = ggc_alloc_zone_stat (length, tree_zone PASS_MEM_STAT);
714 memset (t, 0, length);
716 TREE_SET_CODE (t, TREE_VEC);
717 TREE_VEC_LENGTH (t) = len;
722 /* Return 1 if EXPR is the integer constant zero or a complex constant
726 integer_zerop (tree expr)
730 return ((TREE_CODE (expr) == INTEGER_CST
731 && ! TREE_CONSTANT_OVERFLOW (expr)
732 && TREE_INT_CST_LOW (expr) == 0
733 && TREE_INT_CST_HIGH (expr) == 0)
734 || (TREE_CODE (expr) == COMPLEX_CST
735 && integer_zerop (TREE_REALPART (expr))
736 && integer_zerop (TREE_IMAGPART (expr))));
739 /* Return 1 if EXPR is the integer constant one or the corresponding
743 integer_onep (tree expr)
747 return ((TREE_CODE (expr) == INTEGER_CST
748 && ! TREE_CONSTANT_OVERFLOW (expr)
749 && TREE_INT_CST_LOW (expr) == 1
750 && TREE_INT_CST_HIGH (expr) == 0)
751 || (TREE_CODE (expr) == COMPLEX_CST
752 && integer_onep (TREE_REALPART (expr))
753 && integer_zerop (TREE_IMAGPART (expr))));
756 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
757 it contains. Likewise for the corresponding complex constant. */
760 integer_all_onesp (tree expr)
767 if (TREE_CODE (expr) == COMPLEX_CST
768 && integer_all_onesp (TREE_REALPART (expr))
769 && integer_zerop (TREE_IMAGPART (expr)))
772 else if (TREE_CODE (expr) != INTEGER_CST
773 || TREE_CONSTANT_OVERFLOW (expr))
776 uns = TYPE_UNSIGNED (TREE_TYPE (expr));
778 return (TREE_INT_CST_LOW (expr) == ~(unsigned HOST_WIDE_INT) 0
779 && TREE_INT_CST_HIGH (expr) == -1);
781 /* Note that using TYPE_PRECISION here is wrong. We care about the
782 actual bits, not the (arbitrary) range of the type. */
783 prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr)));
784 if (prec >= HOST_BITS_PER_WIDE_INT)
786 HOST_WIDE_INT high_value;
789 shift_amount = prec - HOST_BITS_PER_WIDE_INT;
791 if (shift_amount > HOST_BITS_PER_WIDE_INT)
792 /* Can not handle precisions greater than twice the host int size. */
794 else if (shift_amount == HOST_BITS_PER_WIDE_INT)
795 /* Shifting by the host word size is undefined according to the ANSI
796 standard, so we must handle this as a special case. */
799 high_value = ((HOST_WIDE_INT) 1 << shift_amount) - 1;
801 return (TREE_INT_CST_LOW (expr) == ~(unsigned HOST_WIDE_INT) 0
802 && TREE_INT_CST_HIGH (expr) == high_value);
805 return TREE_INT_CST_LOW (expr) == ((unsigned HOST_WIDE_INT) 1 << prec) - 1;
808 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
812 integer_pow2p (tree expr)
815 HOST_WIDE_INT high, low;
819 if (TREE_CODE (expr) == COMPLEX_CST
820 && integer_pow2p (TREE_REALPART (expr))
821 && integer_zerop (TREE_IMAGPART (expr)))
824 if (TREE_CODE (expr) != INTEGER_CST || TREE_CONSTANT_OVERFLOW (expr))
827 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
828 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
829 high = TREE_INT_CST_HIGH (expr);
830 low = TREE_INT_CST_LOW (expr);
832 /* First clear all bits that are beyond the type's precision in case
833 we've been sign extended. */
835 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
837 else if (prec > HOST_BITS_PER_WIDE_INT)
838 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
842 if (prec < HOST_BITS_PER_WIDE_INT)
843 low &= ~((HOST_WIDE_INT) (-1) << prec);
846 if (high == 0 && low == 0)
849 return ((high == 0 && (low & (low - 1)) == 0)
850 || (low == 0 && (high & (high - 1)) == 0));
853 /* Return 1 if EXPR is an integer constant other than zero or a
854 complex constant other than zero. */
857 integer_nonzerop (tree expr)
861 return ((TREE_CODE (expr) == INTEGER_CST
862 && ! TREE_CONSTANT_OVERFLOW (expr)
863 && (TREE_INT_CST_LOW (expr) != 0
864 || TREE_INT_CST_HIGH (expr) != 0))
865 || (TREE_CODE (expr) == COMPLEX_CST
866 && (integer_nonzerop (TREE_REALPART (expr))
867 || integer_nonzerop (TREE_IMAGPART (expr)))));
870 /* Return the power of two represented by a tree node known to be a
874 tree_log2 (tree expr)
877 HOST_WIDE_INT high, low;
881 if (TREE_CODE (expr) == COMPLEX_CST)
882 return tree_log2 (TREE_REALPART (expr));
884 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
885 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
887 high = TREE_INT_CST_HIGH (expr);
888 low = TREE_INT_CST_LOW (expr);
890 /* First clear all bits that are beyond the type's precision in case
891 we've been sign extended. */
893 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
895 else if (prec > HOST_BITS_PER_WIDE_INT)
896 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
900 if (prec < HOST_BITS_PER_WIDE_INT)
901 low &= ~((HOST_WIDE_INT) (-1) << prec);
904 return (high != 0 ? HOST_BITS_PER_WIDE_INT + exact_log2 (high)
908 /* Similar, but return the largest integer Y such that 2 ** Y is less
909 than or equal to EXPR. */
912 tree_floor_log2 (tree expr)
915 HOST_WIDE_INT high, low;
919 if (TREE_CODE (expr) == COMPLEX_CST)
920 return tree_log2 (TREE_REALPART (expr));
922 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
923 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
925 high = TREE_INT_CST_HIGH (expr);
926 low = TREE_INT_CST_LOW (expr);
928 /* First clear all bits that are beyond the type's precision in case
929 we've been sign extended. Ignore if type's precision hasn't been set
930 since what we are doing is setting it. */
932 if (prec == 2 * HOST_BITS_PER_WIDE_INT || prec == 0)
934 else if (prec > HOST_BITS_PER_WIDE_INT)
935 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
939 if (prec < HOST_BITS_PER_WIDE_INT)
940 low &= ~((HOST_WIDE_INT) (-1) << prec);
943 return (high != 0 ? HOST_BITS_PER_WIDE_INT + floor_log2 (high)
947 /* Return 1 if EXPR is the real constant zero. */
950 real_zerop (tree expr)
954 return ((TREE_CODE (expr) == REAL_CST
955 && ! TREE_CONSTANT_OVERFLOW (expr)
956 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst0))
957 || (TREE_CODE (expr) == COMPLEX_CST
958 && real_zerop (TREE_REALPART (expr))
959 && real_zerop (TREE_IMAGPART (expr))));
962 /* Return 1 if EXPR is the real constant one in real or complex form. */
965 real_onep (tree expr)
969 return ((TREE_CODE (expr) == REAL_CST
970 && ! TREE_CONSTANT_OVERFLOW (expr)
971 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst1))
972 || (TREE_CODE (expr) == COMPLEX_CST
973 && real_onep (TREE_REALPART (expr))
974 && real_zerop (TREE_IMAGPART (expr))));
977 /* Return 1 if EXPR is the real constant two. */
980 real_twop (tree expr)
984 return ((TREE_CODE (expr) == REAL_CST
985 && ! TREE_CONSTANT_OVERFLOW (expr)
986 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst2))
987 || (TREE_CODE (expr) == COMPLEX_CST
988 && real_twop (TREE_REALPART (expr))
989 && real_zerop (TREE_IMAGPART (expr))));
992 /* Return 1 if EXPR is the real constant minus one. */
995 real_minus_onep (tree expr)
999 return ((TREE_CODE (expr) == REAL_CST
1000 && ! TREE_CONSTANT_OVERFLOW (expr)
1001 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconstm1))
1002 || (TREE_CODE (expr) == COMPLEX_CST
1003 && real_minus_onep (TREE_REALPART (expr))
1004 && real_zerop (TREE_IMAGPART (expr))));
1007 /* Nonzero if EXP is a constant or a cast of a constant. */
1010 really_constant_p (tree exp)
1012 /* This is not quite the same as STRIP_NOPS. It does more. */
1013 while (TREE_CODE (exp) == NOP_EXPR
1014 || TREE_CODE (exp) == CONVERT_EXPR
1015 || TREE_CODE (exp) == NON_LVALUE_EXPR)
1016 exp = TREE_OPERAND (exp, 0);
1017 return TREE_CONSTANT (exp);
1020 /* Return first list element whose TREE_VALUE is ELEM.
1021 Return 0 if ELEM is not in LIST. */
1024 value_member (tree elem, tree list)
1028 if (elem == TREE_VALUE (list))
1030 list = TREE_CHAIN (list);
1035 /* Return first list element whose TREE_PURPOSE is ELEM.
1036 Return 0 if ELEM is not in LIST. */
1039 purpose_member (tree elem, tree list)
1043 if (elem == TREE_PURPOSE (list))
1045 list = TREE_CHAIN (list);
1050 /* Return nonzero if ELEM is part of the chain CHAIN. */
1053 chain_member (tree elem, tree chain)
1059 chain = TREE_CHAIN (chain);
1065 /* Return the length of a chain of nodes chained through TREE_CHAIN.
1066 We expect a null pointer to mark the end of the chain.
1067 This is the Lisp primitive `length'. */
1070 list_length (tree t)
1073 #ifdef ENABLE_TREE_CHECKING
1081 #ifdef ENABLE_TREE_CHECKING
1093 /* Returns the number of FIELD_DECLs in TYPE. */
1096 fields_length (tree type)
1098 tree t = TYPE_FIELDS (type);
1101 for (; t; t = TREE_CHAIN (t))
1102 if (TREE_CODE (t) == FIELD_DECL)
1108 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
1109 by modifying the last node in chain 1 to point to chain 2.
1110 This is the Lisp primitive `nconc'. */
1113 chainon (tree op1, tree op2)
1122 for (t1 = op1; TREE_CHAIN (t1); t1 = TREE_CHAIN (t1))
1124 TREE_CHAIN (t1) = op2;
1126 #ifdef ENABLE_TREE_CHECKING
1129 for (t2 = op2; t2; t2 = TREE_CHAIN (t2))
1131 abort (); /* Circularity created. */
1138 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
1141 tree_last (tree chain)
1145 while ((next = TREE_CHAIN (chain)))
1150 /* Reverse the order of elements in the chain T,
1151 and return the new head of the chain (old last element). */
1156 tree prev = 0, decl, next;
1157 for (decl = t; decl; decl = next)
1159 next = TREE_CHAIN (decl);
1160 TREE_CHAIN (decl) = prev;
1166 /* Return a newly created TREE_LIST node whose
1167 purpose and value fields are PARM and VALUE. */
1170 build_tree_list_stat (tree parm, tree value MEM_STAT_DECL)
1172 tree t = make_node_stat (TREE_LIST PASS_MEM_STAT);
1173 TREE_PURPOSE (t) = parm;
1174 TREE_VALUE (t) = value;
1178 /* Return a newly created TREE_LIST node whose
1179 purpose and value fields are PURPOSE and VALUE
1180 and whose TREE_CHAIN is CHAIN. */
1183 tree_cons_stat (tree purpose, tree value, tree chain MEM_STAT_DECL)
1187 node = ggc_alloc_zone_stat (sizeof (struct tree_list),
1188 tree_zone PASS_MEM_STAT);
1190 memset (node, 0, sizeof (struct tree_common));
1192 #ifdef GATHER_STATISTICS
1193 tree_node_counts[(int) x_kind]++;
1194 tree_node_sizes[(int) x_kind] += sizeof (struct tree_list);
1197 TREE_SET_CODE (node, TREE_LIST);
1198 TREE_CHAIN (node) = chain;
1199 TREE_PURPOSE (node) = purpose;
1200 TREE_VALUE (node) = value;
1205 /* Return the size nominally occupied by an object of type TYPE
1206 when it resides in memory. The value is measured in units of bytes,
1207 and its data type is that normally used for type sizes
1208 (which is the first type created by make_signed_type or
1209 make_unsigned_type). */
1212 size_in_bytes (tree type)
1216 if (type == error_mark_node)
1217 return integer_zero_node;
1219 type = TYPE_MAIN_VARIANT (type);
1220 t = TYPE_SIZE_UNIT (type);
1224 lang_hooks.types.incomplete_type_error (NULL_TREE, type);
1225 return size_zero_node;
1228 if (TREE_CODE (t) == INTEGER_CST)
1229 t = force_fit_type (t, 0, false, false);
1234 /* Return the size of TYPE (in bytes) as a wide integer
1235 or return -1 if the size can vary or is larger than an integer. */
1238 int_size_in_bytes (tree type)
1242 if (type == error_mark_node)
1245 type = TYPE_MAIN_VARIANT (type);
1246 t = TYPE_SIZE_UNIT (type);
1248 || TREE_CODE (t) != INTEGER_CST
1249 || TREE_OVERFLOW (t)
1250 || TREE_INT_CST_HIGH (t) != 0
1251 /* If the result would appear negative, it's too big to represent. */
1252 || (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0)
1255 return TREE_INT_CST_LOW (t);
1258 /* Return the bit position of FIELD, in bits from the start of the record.
1259 This is a tree of type bitsizetype. */
1262 bit_position (tree field)
1264 return bit_from_pos (DECL_FIELD_OFFSET (field),
1265 DECL_FIELD_BIT_OFFSET (field));
1268 /* Likewise, but return as an integer. Abort if it cannot be represented
1269 in that way (since it could be a signed value, we don't have the option
1270 of returning -1 like int_size_in_byte can. */
1273 int_bit_position (tree field)
1275 return tree_low_cst (bit_position (field), 0);
1278 /* Return the byte position of FIELD, in bytes from the start of the record.
1279 This is a tree of type sizetype. */
1282 byte_position (tree field)
1284 return byte_from_pos (DECL_FIELD_OFFSET (field),
1285 DECL_FIELD_BIT_OFFSET (field));
1288 /* Likewise, but return as an integer. Abort if it cannot be represented
1289 in that way (since it could be a signed value, we don't have the option
1290 of returning -1 like int_size_in_byte can. */
1293 int_byte_position (tree field)
1295 return tree_low_cst (byte_position (field), 0);
1298 /* Return the strictest alignment, in bits, that T is known to have. */
1303 unsigned int align0, align1;
1305 switch (TREE_CODE (t))
1307 case NOP_EXPR: case CONVERT_EXPR: case NON_LVALUE_EXPR:
1308 /* If we have conversions, we know that the alignment of the
1309 object must meet each of the alignments of the types. */
1310 align0 = expr_align (TREE_OPERAND (t, 0));
1311 align1 = TYPE_ALIGN (TREE_TYPE (t));
1312 return MAX (align0, align1);
1314 case SAVE_EXPR: case COMPOUND_EXPR: case MODIFY_EXPR:
1315 case INIT_EXPR: case TARGET_EXPR: case WITH_CLEANUP_EXPR:
1316 case CLEANUP_POINT_EXPR:
1317 /* These don't change the alignment of an object. */
1318 return expr_align (TREE_OPERAND (t, 0));
1321 /* The best we can do is say that the alignment is the least aligned
1323 align0 = expr_align (TREE_OPERAND (t, 1));
1324 align1 = expr_align (TREE_OPERAND (t, 2));
1325 return MIN (align0, align1);
1327 case LABEL_DECL: case CONST_DECL:
1328 case VAR_DECL: case PARM_DECL: case RESULT_DECL:
1329 if (DECL_ALIGN (t) != 0)
1330 return DECL_ALIGN (t);
1334 return FUNCTION_BOUNDARY;
1340 /* Otherwise take the alignment from that of the type. */
1341 return TYPE_ALIGN (TREE_TYPE (t));
1344 /* Return, as a tree node, the number of elements for TYPE (which is an
1345 ARRAY_TYPE) minus one. This counts only elements of the top array. */
1348 array_type_nelts (tree type)
1350 tree index_type, min, max;
1352 /* If they did it with unspecified bounds, then we should have already
1353 given an error about it before we got here. */
1354 if (! TYPE_DOMAIN (type))
1355 return error_mark_node;
1357 index_type = TYPE_DOMAIN (type);
1358 min = TYPE_MIN_VALUE (index_type);
1359 max = TYPE_MAX_VALUE (index_type);
1361 return (integer_zerop (min)
1363 : fold (build2 (MINUS_EXPR, TREE_TYPE (max), max, min)));
1366 /* If arg is static -- a reference to an object in static storage -- then
1367 return the object. This is not the same as the C meaning of `static'.
1368 If arg isn't static, return NULL. */
1373 switch (TREE_CODE (arg))
1376 /* Nested functions aren't static, since taking their address
1377 involves a trampoline. */
1378 return ((decl_function_context (arg) == 0 || DECL_NO_STATIC_CHAIN (arg))
1379 && ! DECL_NON_ADDR_CONST_P (arg)
1383 return ((TREE_STATIC (arg) || DECL_EXTERNAL (arg))
1384 && ! DECL_THREAD_LOCAL (arg)
1385 && ! DECL_NON_ADDR_CONST_P (arg)
1389 return TREE_STATIC (arg) ? arg : NULL;
1396 /* If the thing being referenced is not a field, then it is
1397 something language specific. */
1398 if (TREE_CODE (TREE_OPERAND (arg, 1)) != FIELD_DECL)
1399 return (*lang_hooks.staticp) (arg);
1401 /* If we are referencing a bitfield, we can't evaluate an
1402 ADDR_EXPR at compile time and so it isn't a constant. */
1403 if (DECL_BIT_FIELD (TREE_OPERAND (arg, 1)))
1406 return staticp (TREE_OPERAND (arg, 0));
1412 return TREE_CONSTANT (TREE_OPERAND (arg, 0)) ? arg : NULL;
1415 case ARRAY_RANGE_REF:
1416 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg))) == INTEGER_CST
1417 && TREE_CODE (TREE_OPERAND (arg, 1)) == INTEGER_CST)
1418 return staticp (TREE_OPERAND (arg, 0));
1423 if ((unsigned int) TREE_CODE (arg)
1424 >= (unsigned int) LAST_AND_UNUSED_TREE_CODE)
1425 return lang_hooks.staticp (arg);
1431 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
1432 Do this to any expression which may be used in more than one place,
1433 but must be evaluated only once.
1435 Normally, expand_expr would reevaluate the expression each time.
1436 Calling save_expr produces something that is evaluated and recorded
1437 the first time expand_expr is called on it. Subsequent calls to
1438 expand_expr just reuse the recorded value.
1440 The call to expand_expr that generates code that actually computes
1441 the value is the first call *at compile time*. Subsequent calls
1442 *at compile time* generate code to use the saved value.
1443 This produces correct result provided that *at run time* control
1444 always flows through the insns made by the first expand_expr
1445 before reaching the other places where the save_expr was evaluated.
1446 You, the caller of save_expr, must make sure this is so.
1448 Constants, and certain read-only nodes, are returned with no
1449 SAVE_EXPR because that is safe. Expressions containing placeholders
1450 are not touched; see tree.def for an explanation of what these
1454 save_expr (tree expr)
1456 tree t = fold (expr);
1459 /* If the tree evaluates to a constant, then we don't want to hide that
1460 fact (i.e. this allows further folding, and direct checks for constants).
1461 However, a read-only object that has side effects cannot be bypassed.
1462 Since it is no problem to reevaluate literals, we just return the
1464 inner = skip_simple_arithmetic (t);
1466 if (TREE_INVARIANT (inner)
1467 || (TREE_READONLY (inner) && ! TREE_SIDE_EFFECTS (inner))
1468 || TREE_CODE (inner) == SAVE_EXPR
1469 || TREE_CODE (inner) == ERROR_MARK)
1472 /* If INNER contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
1473 it means that the size or offset of some field of an object depends on
1474 the value within another field.
1476 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
1477 and some variable since it would then need to be both evaluated once and
1478 evaluated more than once. Front-ends must assure this case cannot
1479 happen by surrounding any such subexpressions in their own SAVE_EXPR
1480 and forcing evaluation at the proper time. */
1481 if (contains_placeholder_p (inner))
1484 t = build1 (SAVE_EXPR, TREE_TYPE (expr), t);
1486 /* This expression might be placed ahead of a jump to ensure that the
1487 value was computed on both sides of the jump. So make sure it isn't
1488 eliminated as dead. */
1489 TREE_SIDE_EFFECTS (t) = 1;
1490 TREE_READONLY (t) = 1;
1491 TREE_INVARIANT (t) = 1;
1495 /* Look inside EXPR and into any simple arithmetic operations. Return
1496 the innermost non-arithmetic node. */
1499 skip_simple_arithmetic (tree expr)
1503 /* We don't care about whether this can be used as an lvalue in this
1505 while (TREE_CODE (expr) == NON_LVALUE_EXPR)
1506 expr = TREE_OPERAND (expr, 0);
1508 /* If we have simple operations applied to a SAVE_EXPR or to a SAVE_EXPR and
1509 a constant, it will be more efficient to not make another SAVE_EXPR since
1510 it will allow better simplification and GCSE will be able to merge the
1511 computations if they actually occur. */
1515 if (TREE_CODE_CLASS (TREE_CODE (inner)) == '1')
1516 inner = TREE_OPERAND (inner, 0);
1517 else if (TREE_CODE_CLASS (TREE_CODE (inner)) == '2')
1519 if (TREE_INVARIANT (TREE_OPERAND (inner, 1)))
1520 inner = TREE_OPERAND (inner, 0);
1521 else if (TREE_INVARIANT (TREE_OPERAND (inner, 0)))
1522 inner = TREE_OPERAND (inner, 1);
1533 /* Returns the index of the first non-tree operand for CODE, or the number
1534 of operands if all are trees. */
1537 first_rtl_op (enum tree_code code)
1542 return TREE_CODE_LENGTH (code);
1546 /* Return which tree structure is used by T. */
1548 enum tree_node_structure_enum
1549 tree_node_structure (tree t)
1551 enum tree_code code = TREE_CODE (t);
1553 switch (TREE_CODE_CLASS (code))
1555 case 'd': return TS_DECL;
1556 case 't': return TS_TYPE;
1557 case 'r': case '<': case '1': case '2': case 'e': case 's':
1559 default: /* 'c' and 'x' */
1565 case INTEGER_CST: return TS_INT_CST;
1566 case REAL_CST: return TS_REAL_CST;
1567 case COMPLEX_CST: return TS_COMPLEX;
1568 case VECTOR_CST: return TS_VECTOR;
1569 case STRING_CST: return TS_STRING;
1571 case ERROR_MARK: return TS_COMMON;
1572 case IDENTIFIER_NODE: return TS_IDENTIFIER;
1573 case TREE_LIST: return TS_LIST;
1574 case TREE_VEC: return TS_VEC;
1575 case PHI_NODE: return TS_PHI_NODE;
1576 case SSA_NAME: return TS_SSA_NAME;
1577 case PLACEHOLDER_EXPR: return TS_COMMON;
1578 case STATEMENT_LIST: return TS_STATEMENT_LIST;
1579 case BLOCK: return TS_BLOCK;
1580 case TREE_BINFO: return TS_BINFO;
1581 case VALUE_HANDLE: return TS_VALUE_HANDLE;
1588 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
1589 or offset that depends on a field within a record. */
1592 contains_placeholder_p (tree exp)
1594 enum tree_code code;
1599 code = TREE_CODE (exp);
1600 if (code == PLACEHOLDER_EXPR)
1603 switch (TREE_CODE_CLASS (code))
1606 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
1607 position computations since they will be converted into a
1608 WITH_RECORD_EXPR involving the reference, which will assume
1609 here will be valid. */
1610 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));
1613 if (code == TREE_LIST)
1614 return (CONTAINS_PLACEHOLDER_P (TREE_VALUE (exp))
1615 || CONTAINS_PLACEHOLDER_P (TREE_CHAIN (exp)));
1624 /* Ignoring the first operand isn't quite right, but works best. */
1625 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1));
1628 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0))
1629 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1))
1630 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 2)));
1636 switch (first_rtl_op (code))
1639 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));
1641 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0))
1642 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1)));
1653 /* Return 1 if any part of the computation of TYPE involves a PLACEHOLDER_EXPR.
1654 This includes size, bounds, qualifiers (for QUAL_UNION_TYPE) and field
1658 type_contains_placeholder_p (tree type)
1660 /* If the size contains a placeholder or the parent type (component type in
1661 the case of arrays) type involves a placeholder, this type does. */
1662 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type))
1663 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (type))
1664 || (TREE_TYPE (type) != 0
1665 && type_contains_placeholder_p (TREE_TYPE (type))))
1668 /* Now do type-specific checks. Note that the last part of the check above
1669 greatly limits what we have to do below. */
1670 switch (TREE_CODE (type))
1679 case REFERENCE_TYPE:
1687 /* Here we just check the bounds. */
1688 return (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (type))
1689 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (type)));
1694 /* We're already checked the component type (TREE_TYPE), so just check
1696 return type_contains_placeholder_p (TYPE_DOMAIN (type));
1700 case QUAL_UNION_TYPE:
1702 static tree seen_types = 0;
1706 /* We have to be careful here that we don't end up in infinite
1707 recursions due to a field of a type being a pointer to that type
1708 or to a mutually-recursive type. So we store a list of record
1709 types that we've seen and see if this type is in them. To save
1710 memory, we don't use a list for just one type. Here we check
1711 whether we've seen this type before and store it if not. */
1712 if (seen_types == 0)
1714 else if (TREE_CODE (seen_types) != TREE_LIST)
1716 if (seen_types == type)
1719 seen_types = tree_cons (NULL_TREE, type,
1720 build_tree_list (NULL_TREE, seen_types));
1724 if (value_member (type, seen_types) != 0)
1727 seen_types = tree_cons (NULL_TREE, type, seen_types);
1730 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
1731 if (TREE_CODE (field) == FIELD_DECL
1732 && (CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (field))
1733 || (TREE_CODE (type) == QUAL_UNION_TYPE
1734 && CONTAINS_PLACEHOLDER_P (DECL_QUALIFIER (field)))
1735 || type_contains_placeholder_p (TREE_TYPE (field))))
1741 /* Now remove us from seen_types and return the result. */
1742 if (seen_types == type)
1745 seen_types = TREE_CHAIN (seen_types);
1755 /* Return 1 if EXP contains any expressions that produce cleanups for an
1756 outer scope to deal with. Used by fold. */
1759 has_cleanups (tree exp)
1763 if (! TREE_SIDE_EFFECTS (exp))
1766 switch (TREE_CODE (exp))
1769 case WITH_CLEANUP_EXPR:
1772 case CLEANUP_POINT_EXPR:
1776 for (exp = TREE_OPERAND (exp, 1); exp; exp = TREE_CHAIN (exp))
1778 cmp = has_cleanups (TREE_VALUE (exp));
1785 return (DECL_INITIAL (DECL_EXPR_DECL (exp))
1786 && has_cleanups (DECL_INITIAL (DECL_EXPR_DECL (exp))));
1792 /* This general rule works for most tree codes. All exceptions should be
1793 handled above. If this is a language-specific tree code, we can't
1794 trust what might be in the operand, so say we don't know
1796 if ((int) TREE_CODE (exp) >= (int) LAST_AND_UNUSED_TREE_CODE)
1799 nops = first_rtl_op (TREE_CODE (exp));
1800 for (i = 0; i < nops; i++)
1801 if (TREE_OPERAND (exp, i) != 0)
1803 int type = TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, i)));
1804 if (type == 'e' || type == '<' || type == '1' || type == '2'
1805 || type == 'r' || type == 's')
1807 cmp = has_cleanups (TREE_OPERAND (exp, i));
1816 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
1817 return a tree with all occurrences of references to F in a
1818 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
1819 contains only arithmetic expressions or a CALL_EXPR with a
1820 PLACEHOLDER_EXPR occurring only in its arglist. */
1823 substitute_in_expr (tree exp, tree f, tree r)
1825 enum tree_code code = TREE_CODE (exp);
1830 /* We handle TREE_LIST and COMPONENT_REF separately. */
1831 if (code == TREE_LIST)
1833 op0 = SUBSTITUTE_IN_EXPR (TREE_CHAIN (exp), f, r);
1834 op1 = SUBSTITUTE_IN_EXPR (TREE_VALUE (exp), f, r);
1835 if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
1838 return tree_cons (TREE_PURPOSE (exp), op1, op0);
1840 else if (code == COMPONENT_REF)
1842 /* If this expression is getting a value from a PLACEHOLDER_EXPR
1843 and it is the right field, replace it with R. */
1844 for (inner = TREE_OPERAND (exp, 0);
1845 TREE_CODE_CLASS (TREE_CODE (inner)) == 'r';
1846 inner = TREE_OPERAND (inner, 0))
1848 if (TREE_CODE (inner) == PLACEHOLDER_EXPR
1849 && TREE_OPERAND (exp, 1) == f)
1852 /* If this expression hasn't been completed let, leave it alone. */
1853 if (TREE_CODE (inner) == PLACEHOLDER_EXPR && TREE_TYPE (inner) == 0)
1856 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
1857 if (op0 == TREE_OPERAND (exp, 0))
1860 new = fold (build3 (COMPONENT_REF, TREE_TYPE (exp),
1861 op0, TREE_OPERAND (exp, 1), NULL_TREE));
1864 switch (TREE_CODE_CLASS (code))
1876 switch (first_rtl_op (code))
1882 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
1883 if (op0 == TREE_OPERAND (exp, 0))
1886 new = fold (build1 (code, TREE_TYPE (exp), op0));
1890 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
1891 op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
1893 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
1896 new = fold (build2 (code, TREE_TYPE (exp), op0, op1));
1900 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
1901 op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
1902 op2 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 2), f, r);
1904 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
1905 && op2 == TREE_OPERAND (exp, 2))
1908 new = fold (build3 (code, TREE_TYPE (exp), op0, op1, op2));
1920 TREE_READONLY (new) = TREE_READONLY (exp);
1924 /* Similar, but look for a PLACEHOLDER_EXPR in EXP and find a replacement
1925 for it within OBJ, a tree that is an object or a chain of references. */
1928 substitute_placeholder_in_expr (tree exp, tree obj)
1930 enum tree_code code = TREE_CODE (exp);
1931 tree op0, op1, op2, op3;
1933 /* If this is a PLACEHOLDER_EXPR, see if we find a corresponding type
1934 in the chain of OBJ. */
1935 if (code == PLACEHOLDER_EXPR)
1937 tree need_type = TYPE_MAIN_VARIANT (TREE_TYPE (exp));
1940 for (elt = obj; elt != 0;
1941 elt = ((TREE_CODE (elt) == COMPOUND_EXPR
1942 || TREE_CODE (elt) == COND_EXPR)
1943 ? TREE_OPERAND (elt, 1)
1944 : (TREE_CODE_CLASS (TREE_CODE (elt)) == 'r'
1945 || TREE_CODE_CLASS (TREE_CODE (elt)) == '1'
1946 || TREE_CODE_CLASS (TREE_CODE (elt)) == '2'
1947 || TREE_CODE_CLASS (TREE_CODE (elt)) == 'e')
1948 ? TREE_OPERAND (elt, 0) : 0))
1949 if (TYPE_MAIN_VARIANT (TREE_TYPE (elt)) == need_type)
1952 for (elt = obj; elt != 0;
1953 elt = ((TREE_CODE (elt) == COMPOUND_EXPR
1954 || TREE_CODE (elt) == COND_EXPR)
1955 ? TREE_OPERAND (elt, 1)
1956 : (TREE_CODE_CLASS (TREE_CODE (elt)) == 'r'
1957 || TREE_CODE_CLASS (TREE_CODE (elt)) == '1'
1958 || TREE_CODE_CLASS (TREE_CODE (elt)) == '2'
1959 || TREE_CODE_CLASS (TREE_CODE (elt)) == 'e')
1960 ? TREE_OPERAND (elt, 0) : 0))
1961 if (POINTER_TYPE_P (TREE_TYPE (elt))
1962 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (elt)))
1964 return fold (build1 (INDIRECT_REF, need_type, elt));
1966 /* If we didn't find it, return the original PLACEHOLDER_EXPR. If it
1967 survives until RTL generation, there will be an error. */
1971 /* TREE_LIST is special because we need to look at TREE_VALUE
1972 and TREE_CHAIN, not TREE_OPERANDS. */
1973 else if (code == TREE_LIST)
1975 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp), obj);
1976 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp), obj);
1977 if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
1980 return tree_cons (TREE_PURPOSE (exp), op1, op0);
1983 switch (TREE_CODE_CLASS (code))
1996 switch (first_rtl_op (code))
2002 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
2003 if (op0 == TREE_OPERAND (exp, 0))
2006 return fold (build1 (code, TREE_TYPE (exp), op0));
2009 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
2010 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
2012 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
2015 return fold (build2 (code, TREE_TYPE (exp), op0, op1));
2018 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
2019 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
2020 op2 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 2), obj);
2022 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
2023 && op2 == TREE_OPERAND (exp, 2))
2026 return fold (build3 (code, TREE_TYPE (exp), op0, op1, op2));
2029 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
2030 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
2031 op2 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 2), obj);
2032 op3 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 3), obj);
2034 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
2035 && op2 == TREE_OPERAND (exp, 2)
2036 && op3 == TREE_OPERAND (exp, 3))
2039 return fold (build4 (code, TREE_TYPE (exp), op0, op1, op2, op3));
2051 /* Stabilize a reference so that we can use it any number of times
2052 without causing its operands to be evaluated more than once.
2053 Returns the stabilized reference. This works by means of save_expr,
2054 so see the caveats in the comments about save_expr.
2056 Also allows conversion expressions whose operands are references.
2057 Any other kind of expression is returned unchanged. */
2060 stabilize_reference (tree ref)
2063 enum tree_code code = TREE_CODE (ref);
2070 /* No action is needed in this case. */
2076 case FIX_TRUNC_EXPR:
2077 case FIX_FLOOR_EXPR:
2078 case FIX_ROUND_EXPR:
2080 result = build_nt (code, stabilize_reference (TREE_OPERAND (ref, 0)));
2084 result = build_nt (INDIRECT_REF,
2085 stabilize_reference_1 (TREE_OPERAND (ref, 0)));
2089 result = build_nt (COMPONENT_REF,
2090 stabilize_reference (TREE_OPERAND (ref, 0)),
2091 TREE_OPERAND (ref, 1), NULL_TREE);
2095 result = build_nt (BIT_FIELD_REF,
2096 stabilize_reference (TREE_OPERAND (ref, 0)),
2097 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
2098 stabilize_reference_1 (TREE_OPERAND (ref, 2)));
2102 result = build_nt (ARRAY_REF,
2103 stabilize_reference (TREE_OPERAND (ref, 0)),
2104 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
2105 TREE_OPERAND (ref, 2), TREE_OPERAND (ref, 3));
2108 case ARRAY_RANGE_REF:
2109 result = build_nt (ARRAY_RANGE_REF,
2110 stabilize_reference (TREE_OPERAND (ref, 0)),
2111 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
2112 TREE_OPERAND (ref, 2), TREE_OPERAND (ref, 3));
2116 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2117 it wouldn't be ignored. This matters when dealing with
2119 return stabilize_reference_1 (ref);
2121 /* If arg isn't a kind of lvalue we recognize, make no change.
2122 Caller should recognize the error for an invalid lvalue. */
2127 return error_mark_node;
2130 TREE_TYPE (result) = TREE_TYPE (ref);
2131 TREE_READONLY (result) = TREE_READONLY (ref);
2132 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (ref);
2133 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);
2138 /* Subroutine of stabilize_reference; this is called for subtrees of
2139 references. Any expression with side-effects must be put in a SAVE_EXPR
2140 to ensure that it is only evaluated once.
2142 We don't put SAVE_EXPR nodes around everything, because assigning very
2143 simple expressions to temporaries causes us to miss good opportunities
2144 for optimizations. Among other things, the opportunity to fold in the
2145 addition of a constant into an addressing mode often gets lost, e.g.
2146 "y[i+1] += x;". In general, we take the approach that we should not make
2147 an assignment unless we are forced into it - i.e., that any non-side effect
2148 operator should be allowed, and that cse should take care of coalescing
2149 multiple utterances of the same expression should that prove fruitful. */
2152 stabilize_reference_1 (tree e)
2155 enum tree_code code = TREE_CODE (e);
2157 /* We cannot ignore const expressions because it might be a reference
2158 to a const array but whose index contains side-effects. But we can
2159 ignore things that are actual constant or that already have been
2160 handled by this function. */
2162 if (TREE_INVARIANT (e))
2165 switch (TREE_CODE_CLASS (code))
2174 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2175 so that it will only be evaluated once. */
2176 /* The reference (r) and comparison (<) classes could be handled as
2177 below, but it is generally faster to only evaluate them once. */
2178 if (TREE_SIDE_EFFECTS (e))
2179 return save_expr (e);
2183 /* Constants need no processing. In fact, we should never reach
2188 /* Division is slow and tends to be compiled with jumps,
2189 especially the division by powers of 2 that is often
2190 found inside of an array reference. So do it just once. */
2191 if (code == TRUNC_DIV_EXPR || code == TRUNC_MOD_EXPR
2192 || code == FLOOR_DIV_EXPR || code == FLOOR_MOD_EXPR
2193 || code == CEIL_DIV_EXPR || code == CEIL_MOD_EXPR
2194 || code == ROUND_DIV_EXPR || code == ROUND_MOD_EXPR)
2195 return save_expr (e);
2196 /* Recursively stabilize each operand. */
2197 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)),
2198 stabilize_reference_1 (TREE_OPERAND (e, 1)));
2202 /* Recursively stabilize each operand. */
2203 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)));
2210 TREE_TYPE (result) = TREE_TYPE (e);
2211 TREE_READONLY (result) = TREE_READONLY (e);
2212 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (e);
2213 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);
2214 TREE_INVARIANT (result) = 1;
2219 /* Low-level constructors for expressions. */
2221 /* A helper function for build1 and constant folders. Set TREE_CONSTANT,
2222 TREE_INVARIANT, and TREE_SIDE_EFFECTS for an ADDR_EXPR. */
2225 recompute_tree_invarant_for_addr_expr (tree t)
2228 bool tc = true, ti = true, se = false;
2230 /* We started out assuming this address is both invariant and constant, but
2231 does not have side effects. Now go down any handled components and see if
2232 any of them involve offsets that are either non-constant or non-invariant.
2233 Also check for side-effects.
2235 ??? Note that this code makes no attempt to deal with the case where
2236 taking the address of something causes a copy due to misalignment. */
2238 #define UPDATE_TITCSE(NODE) \
2239 do { tree _node = (NODE); \
2240 if (_node && !TREE_INVARIANT (_node)) ti = false; \
2241 if (_node && !TREE_CONSTANT (_node)) tc = false; \
2242 if (_node && TREE_SIDE_EFFECTS (_node)) se = true; } while (0)
2244 for (node = TREE_OPERAND (t, 0); handled_component_p (node);
2245 node = TREE_OPERAND (node, 0))
2247 /* If the first operand doesn't have an ARRAY_TYPE, this is a bogus
2248 array reference (probably made temporarily by the G++ front end),
2249 so ignore all the operands. */
2250 if ((TREE_CODE (node) == ARRAY_REF
2251 || TREE_CODE (node) == ARRAY_RANGE_REF)
2252 && TREE_CODE (TREE_TYPE (TREE_OPERAND (node, 0))) == ARRAY_TYPE)
2254 UPDATE_TITCSE (TREE_OPERAND (node, 1));
2255 if (TREE_OPERAND (node, 2))
2256 UPDATE_TITCSE (TREE_OPERAND (node, 2));
2257 if (TREE_OPERAND (node, 3))
2258 UPDATE_TITCSE (TREE_OPERAND (node, 3));
2260 /* Likewise, just because this is a COMPONENT_REF doesn't mean we have a
2261 FIELD_DECL, apparently. The G++ front end can put something else
2262 there, at least temporarily. */
2263 else if (TREE_CODE (node) == COMPONENT_REF
2264 && TREE_CODE (TREE_OPERAND (node, 1)) == FIELD_DECL)
2266 if (TREE_OPERAND (node, 2))
2267 UPDATE_TITCSE (TREE_OPERAND (node, 2));
2269 else if (TREE_CODE (node) == BIT_FIELD_REF)
2270 UPDATE_TITCSE (TREE_OPERAND (node, 2));
2273 /* Now see what's inside. If it's an INDIRECT_REF, copy our properties from
2274 it. If it's a decl, it's invariant and constant if the decl is static.
2275 It's also invariant if it's a decl in the current function. (Taking the
2276 address of a volatile variable is not volatile.) If it's a constant,
2277 the address is both invariant and constant. Otherwise it's neither. */
2278 if (TREE_CODE (node) == INDIRECT_REF)
2280 /* If this is &((T*)0)->field, then this is a form of addition. */
2281 if (TREE_CODE (TREE_OPERAND (node, 0)) != INTEGER_CST)
2282 UPDATE_TITCSE (node);
2284 else if (DECL_P (node))
2288 else if (decl_function_context (node) == current_function_decl)
2293 else if (TREE_CODE_CLASS (TREE_CODE (node)) == 'c')
2298 se |= TREE_SIDE_EFFECTS (node);
2301 TREE_CONSTANT (t) = tc;
2302 TREE_INVARIANT (t) = ti;
2303 TREE_SIDE_EFFECTS (t) = se;
2304 #undef UPDATE_TITCSE
2307 /* Build an expression of code CODE, data type TYPE, and operands as
2308 specified. Expressions and reference nodes can be created this way.
2309 Constants, decls, types and misc nodes cannot be.
2311 We define 5 non-variadic functions, from 0 to 4 arguments. This is
2312 enough for all extant tree codes. These functions can be called
2313 directly (preferably!), but can also be obtained via GCC preprocessor
2314 magic within the build macro. */
2317 build0_stat (enum tree_code code, tree tt MEM_STAT_DECL)
2321 #ifdef ENABLE_CHECKING
2322 if (TREE_CODE_LENGTH (code) != 0)
2326 t = make_node_stat (code PASS_MEM_STAT);
2333 build1_stat (enum tree_code code, tree type, tree node MEM_STAT_DECL)
2335 int length = sizeof (struct tree_exp);
2336 #ifdef GATHER_STATISTICS
2337 tree_node_kind kind;
2341 #ifdef GATHER_STATISTICS
2342 switch (TREE_CODE_CLASS (code))
2344 case 's': /* an expression with side effects */
2347 case 'r': /* a reference */
2355 tree_node_counts[(int) kind]++;
2356 tree_node_sizes[(int) kind] += length;
2359 #ifdef ENABLE_CHECKING
2360 if (TREE_CODE_LENGTH (code) != 1)
2362 #endif /* ENABLE_CHECKING */
2364 t = ggc_alloc_zone_stat (length, tree_zone PASS_MEM_STAT);
2366 memset (t, 0, sizeof (struct tree_common));
2368 TREE_SET_CODE (t, code);
2370 TREE_TYPE (t) = type;
2371 #ifdef USE_MAPPED_LOCATION
2372 SET_EXPR_LOCATION (t, UNKNOWN_LOCATION);
2374 SET_EXPR_LOCUS (t, NULL);
2376 TREE_COMPLEXITY (t) = 0;
2377 TREE_OPERAND (t, 0) = node;
2378 TREE_BLOCK (t) = NULL_TREE;
2379 if (node && !TYPE_P (node) && first_rtl_op (code) != 0)
2381 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (node);
2382 TREE_READONLY (t) = TREE_READONLY (node);
2385 if (TREE_CODE_CLASS (code) == 's')
2386 TREE_SIDE_EFFECTS (t) = 1;
2392 case PREDECREMENT_EXPR:
2393 case PREINCREMENT_EXPR:
2394 case POSTDECREMENT_EXPR:
2395 case POSTINCREMENT_EXPR:
2396 /* All of these have side-effects, no matter what their
2398 TREE_SIDE_EFFECTS (t) = 1;
2399 TREE_READONLY (t) = 0;
2403 /* Whether a dereference is readonly has nothing to do with whether
2404 its operand is readonly. */
2405 TREE_READONLY (t) = 0;
2410 recompute_tree_invarant_for_addr_expr (t);
2414 if (TREE_CODE_CLASS (code) == '1' && node && !TYPE_P (node)
2415 && TREE_CONSTANT (node))
2416 TREE_CONSTANT (t) = 1;
2417 if (TREE_CODE_CLASS (code) == '1' && node && TREE_INVARIANT (node))
2418 TREE_INVARIANT (t) = 1;
2419 if (TREE_CODE_CLASS (code) == 'r' && node && TREE_THIS_VOLATILE (node))
2420 TREE_THIS_VOLATILE (t) = 1;
2427 #define PROCESS_ARG(N) \
2429 TREE_OPERAND (t, N) = arg##N; \
2430 if (arg##N &&!TYPE_P (arg##N) && fro > N) \
2432 if (TREE_SIDE_EFFECTS (arg##N)) \
2434 if (!TREE_READONLY (arg##N)) \
2436 if (!TREE_CONSTANT (arg##N)) \
2438 if (!TREE_INVARIANT (arg##N)) \
2444 build2_stat (enum tree_code code, tree tt, tree arg0, tree arg1 MEM_STAT_DECL)
2446 bool constant, read_only, side_effects, invariant;
2450 #ifdef ENABLE_CHECKING
2451 if (TREE_CODE_LENGTH (code) != 2)
2455 t = make_node_stat (code PASS_MEM_STAT);
2458 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
2459 result based on those same flags for the arguments. But if the
2460 arguments aren't really even `tree' expressions, we shouldn't be trying
2462 fro = first_rtl_op (code);
2464 /* Expressions without side effects may be constant if their
2465 arguments are as well. */
2466 constant = (TREE_CODE_CLASS (code) == '<'
2467 || TREE_CODE_CLASS (code) == '2');
2469 side_effects = TREE_SIDE_EFFECTS (t);
2470 invariant = constant;
2475 TREE_READONLY (t) = read_only;
2476 TREE_CONSTANT (t) = constant;
2477 TREE_INVARIANT (t) = invariant;
2478 TREE_SIDE_EFFECTS (t) = side_effects;
2479 TREE_THIS_VOLATILE (t)
2480 = TREE_CODE_CLASS (code) == 'r' && arg0 && TREE_THIS_VOLATILE (arg0);
2486 build3_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
2487 tree arg2 MEM_STAT_DECL)
2489 bool constant, read_only, side_effects, invariant;
2493 #ifdef ENABLE_CHECKING
2494 if (TREE_CODE_LENGTH (code) != 3)
2498 t = make_node_stat (code PASS_MEM_STAT);
2501 fro = first_rtl_op (code);
2503 side_effects = TREE_SIDE_EFFECTS (t);
2509 if (code == CALL_EXPR && !side_effects)
2514 /* Calls have side-effects, except those to const or
2516 i = call_expr_flags (t);
2517 if (!(i & (ECF_CONST | ECF_PURE)))
2520 /* And even those have side-effects if their arguments do. */
2521 else for (node = arg1; node; node = TREE_CHAIN (node))
2522 if (TREE_SIDE_EFFECTS (TREE_VALUE (node)))
2529 TREE_SIDE_EFFECTS (t) = side_effects;
2530 TREE_THIS_VOLATILE (t)
2531 = TREE_CODE_CLASS (code) == 'r' && arg0 && TREE_THIS_VOLATILE (arg0);
2537 build4_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
2538 tree arg2, tree arg3 MEM_STAT_DECL)
2540 bool constant, read_only, side_effects, invariant;
2544 #ifdef ENABLE_CHECKING
2545 if (TREE_CODE_LENGTH (code) != 4)
2549 t = make_node_stat (code PASS_MEM_STAT);
2552 fro = first_rtl_op (code);
2554 side_effects = TREE_SIDE_EFFECTS (t);
2561 TREE_SIDE_EFFECTS (t) = side_effects;
2562 TREE_THIS_VOLATILE (t)
2563 = TREE_CODE_CLASS (code) == 'r' && arg0 && TREE_THIS_VOLATILE (arg0);
2568 /* Backup definition for non-gcc build compilers. */
2571 (build) (enum tree_code code, tree tt, ...)
2573 tree t, arg0, arg1, arg2, arg3;
2574 int length = TREE_CODE_LENGTH (code);
2581 t = build0 (code, tt);
2584 arg0 = va_arg (p, tree);
2585 t = build1 (code, tt, arg0);
2588 arg0 = va_arg (p, tree);
2589 arg1 = va_arg (p, tree);
2590 t = build2 (code, tt, arg0, arg1);
2593 arg0 = va_arg (p, tree);
2594 arg1 = va_arg (p, tree);
2595 arg2 = va_arg (p, tree);
2596 t = build3 (code, tt, arg0, arg1, arg2);
2599 arg0 = va_arg (p, tree);
2600 arg1 = va_arg (p, tree);
2601 arg2 = va_arg (p, tree);
2602 arg3 = va_arg (p, tree);
2603 t = build4 (code, tt, arg0, arg1, arg2, arg3);
2613 /* Similar except don't specify the TREE_TYPE
2614 and leave the TREE_SIDE_EFFECTS as 0.
2615 It is permissible for arguments to be null,
2616 or even garbage if their values do not matter. */
2619 build_nt (enum tree_code code, ...)
2628 t = make_node (code);
2629 length = TREE_CODE_LENGTH (code);
2631 for (i = 0; i < length; i++)
2632 TREE_OPERAND (t, i) = va_arg (p, tree);
2638 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
2639 We do NOT enter this node in any sort of symbol table.
2641 layout_decl is used to set up the decl's storage layout.
2642 Other slots are initialized to 0 or null pointers. */
2645 build_decl_stat (enum tree_code code, tree name, tree type MEM_STAT_DECL)
2649 t = make_node_stat (code PASS_MEM_STAT);
2651 /* if (type == error_mark_node)
2652 type = integer_type_node; */
2653 /* That is not done, deliberately, so that having error_mark_node
2654 as the type can suppress useless errors in the use of this variable. */
2656 DECL_NAME (t) = name;
2657 TREE_TYPE (t) = type;
2659 if (code == VAR_DECL || code == PARM_DECL || code == RESULT_DECL)
2661 else if (code == FUNCTION_DECL)
2662 DECL_MODE (t) = FUNCTION_MODE;
2664 /* Set default visibility to whatever the user supplied with
2665 visibility_specified depending on #pragma GCC visibility. */
2666 DECL_VISIBILITY (t) = default_visibility;
2667 DECL_VISIBILITY_SPECIFIED (t) = visibility_options.inpragma;
2672 /* BLOCK nodes are used to represent the structure of binding contours
2673 and declarations, once those contours have been exited and their contents
2674 compiled. This information is used for outputting debugging info. */
2677 build_block (tree vars, tree tags ATTRIBUTE_UNUSED, tree subblocks,
2678 tree supercontext, tree chain)
2680 tree block = make_node (BLOCK);
2682 BLOCK_VARS (block) = vars;
2683 BLOCK_SUBBLOCKS (block) = subblocks;
2684 BLOCK_SUPERCONTEXT (block) = supercontext;
2685 BLOCK_CHAIN (block) = chain;
2689 #if 1 /* ! defined(USE_MAPPED_LOCATION) */
2690 /* ??? gengtype doesn't handle conditionals */
2691 static GTY(()) tree last_annotated_node;
2694 #ifdef USE_MAPPED_LOCATION
2697 expand_location (source_location loc)
2699 expanded_location xloc;
2700 if (loc == 0) { xloc.file = NULL; xloc.line = 0; xloc.column = 0; }
2703 const struct line_map *map = linemap_lookup (&line_table, loc);
2704 xloc.file = map->to_file;
2705 xloc.line = SOURCE_LINE (map, loc);
2706 xloc.column = SOURCE_COLUMN (map, loc);
2713 /* Record the exact location where an expression or an identifier were
2717 annotate_with_file_line (tree node, const char *file, int line)
2719 /* Roughly one percent of the calls to this function are to annotate
2720 a node with the same information already attached to that node!
2721 Just return instead of wasting memory. */
2722 if (EXPR_LOCUS (node)
2723 && (EXPR_FILENAME (node) == file
2724 || ! strcmp (EXPR_FILENAME (node), file))
2725 && EXPR_LINENO (node) == line)
2727 last_annotated_node = node;
2731 /* In heavily macroized code (such as GCC itself) this single
2732 entry cache can reduce the number of allocations by more
2734 if (last_annotated_node
2735 && EXPR_LOCUS (last_annotated_node)
2736 && (EXPR_FILENAME (last_annotated_node) == file
2737 || ! strcmp (EXPR_FILENAME (last_annotated_node), file))
2738 && EXPR_LINENO (last_annotated_node) == line)
2740 SET_EXPR_LOCUS (node, EXPR_LOCUS (last_annotated_node));
2744 SET_EXPR_LOCUS (node, ggc_alloc (sizeof (location_t)));
2745 EXPR_LINENO (node) = line;
2746 EXPR_FILENAME (node) = file;
2747 last_annotated_node = node;
2751 annotate_with_locus (tree node, location_t locus)
2753 annotate_with_file_line (node, locus.file, locus.line);
2757 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
2761 build_decl_attribute_variant (tree ddecl, tree attribute)
2763 DECL_ATTRIBUTES (ddecl) = attribute;
2767 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
2770 Record such modified types already made so we don't make duplicates. */
2773 build_type_attribute_variant (tree ttype, tree attribute)
2775 if (! attribute_list_equal (TYPE_ATTRIBUTES (ttype), attribute))
2777 hashval_t hashcode = 0;
2779 enum tree_code code = TREE_CODE (ttype);
2781 ntype = copy_node (ttype);
2783 TYPE_POINTER_TO (ntype) = 0;
2784 TYPE_REFERENCE_TO (ntype) = 0;
2785 TYPE_ATTRIBUTES (ntype) = attribute;
2787 /* Create a new main variant of TYPE. */
2788 TYPE_MAIN_VARIANT (ntype) = ntype;
2789 TYPE_NEXT_VARIANT (ntype) = 0;
2790 set_type_quals (ntype, TYPE_UNQUALIFIED);
2792 hashcode = iterative_hash_object (code, hashcode);
2793 if (TREE_TYPE (ntype))
2794 hashcode = iterative_hash_object (TYPE_HASH (TREE_TYPE (ntype)),
2796 hashcode = attribute_hash_list (attribute, hashcode);
2798 switch (TREE_CODE (ntype))
2801 hashcode = type_hash_list (TYPE_ARG_TYPES (ntype), hashcode);
2804 hashcode = iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (ntype)),
2808 hashcode = iterative_hash_object
2809 (TREE_INT_CST_LOW (TYPE_MAX_VALUE (ntype)), hashcode);
2810 hashcode = iterative_hash_object
2811 (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (ntype)), hashcode);
2815 unsigned int precision = TYPE_PRECISION (ntype);
2816 hashcode = iterative_hash_object (precision, hashcode);
2823 ntype = type_hash_canon (hashcode, ntype);
2824 ttype = build_qualified_type (ntype, TYPE_QUALS (ttype));
2830 /* Return nonzero if IDENT is a valid name for attribute ATTR,
2833 We try both `text' and `__text__', ATTR may be either one. */
2834 /* ??? It might be a reasonable simplification to require ATTR to be only
2835 `text'. One might then also require attribute lists to be stored in
2836 their canonicalized form. */
2839 is_attribute_p (const char *attr, tree ident)
2841 int ident_len, attr_len;
2844 if (TREE_CODE (ident) != IDENTIFIER_NODE)
2847 if (strcmp (attr, IDENTIFIER_POINTER (ident)) == 0)
2850 p = IDENTIFIER_POINTER (ident);
2851 ident_len = strlen (p);
2852 attr_len = strlen (attr);
2854 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
2858 || attr[attr_len - 2] != '_'
2859 || attr[attr_len - 1] != '_')
2861 if (ident_len == attr_len - 4
2862 && strncmp (attr + 2, p, attr_len - 4) == 0)
2867 if (ident_len == attr_len + 4
2868 && p[0] == '_' && p[1] == '_'
2869 && p[ident_len - 2] == '_' && p[ident_len - 1] == '_'
2870 && strncmp (attr, p + 2, attr_len) == 0)
2877 /* Given an attribute name and a list of attributes, return a pointer to the
2878 attribute's list element if the attribute is part of the list, or NULL_TREE
2879 if not found. If the attribute appears more than once, this only
2880 returns the first occurrence; the TREE_CHAIN of the return value should
2881 be passed back in if further occurrences are wanted. */
2884 lookup_attribute (const char *attr_name, tree list)
2888 for (l = list; l; l = TREE_CHAIN (l))
2890 if (TREE_CODE (TREE_PURPOSE (l)) != IDENTIFIER_NODE)
2892 if (is_attribute_p (attr_name, TREE_PURPOSE (l)))
2899 /* Return an attribute list that is the union of a1 and a2. */
2902 merge_attributes (tree a1, tree a2)
2906 /* Either one unset? Take the set one. */
2908 if ((attributes = a1) == 0)
2911 /* One that completely contains the other? Take it. */
2913 else if (a2 != 0 && ! attribute_list_contained (a1, a2))
2915 if (attribute_list_contained (a2, a1))
2919 /* Pick the longest list, and hang on the other list. */
2921 if (list_length (a1) < list_length (a2))
2922 attributes = a2, a2 = a1;
2924 for (; a2 != 0; a2 = TREE_CHAIN (a2))
2927 for (a = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)),
2930 a = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)),
2933 if (simple_cst_equal (TREE_VALUE (a), TREE_VALUE (a2)) == 1)
2938 a1 = copy_node (a2);
2939 TREE_CHAIN (a1) = attributes;
2948 /* Given types T1 and T2, merge their attributes and return
2952 merge_type_attributes (tree t1, tree t2)
2954 return merge_attributes (TYPE_ATTRIBUTES (t1),
2955 TYPE_ATTRIBUTES (t2));
2958 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
2962 merge_decl_attributes (tree olddecl, tree newdecl)
2964 return merge_attributes (DECL_ATTRIBUTES (olddecl),
2965 DECL_ATTRIBUTES (newdecl));
2968 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
2970 /* Specialization of merge_decl_attributes for various Windows targets.
2972 This handles the following situation:
2974 __declspec (dllimport) int foo;
2977 The second instance of `foo' nullifies the dllimport. */
2980 merge_dllimport_decl_attributes (tree old, tree new)
2983 int delete_dllimport_p;
2985 old = DECL_ATTRIBUTES (old);
2986 new = DECL_ATTRIBUTES (new);
2988 /* What we need to do here is remove from `old' dllimport if it doesn't
2989 appear in `new'. dllimport behaves like extern: if a declaration is
2990 marked dllimport and a definition appears later, then the object
2991 is not dllimport'd. */
2992 if (lookup_attribute ("dllimport", old) != NULL_TREE
2993 && lookup_attribute ("dllimport", new) == NULL_TREE)
2994 delete_dllimport_p = 1;
2996 delete_dllimport_p = 0;
2998 a = merge_attributes (old, new);
3000 if (delete_dllimport_p)
3004 /* Scan the list for dllimport and delete it. */
3005 for (prev = NULL_TREE, t = a; t; prev = t, t = TREE_CHAIN (t))
3007 if (is_attribute_p ("dllimport", TREE_PURPOSE (t)))
3009 if (prev == NULL_TREE)
3012 TREE_CHAIN (prev) = TREE_CHAIN (t);
3021 /* Handle a "dllimport" or "dllexport" attribute; arguments as in
3022 struct attribute_spec.handler. */
3025 handle_dll_attribute (tree * pnode, tree name, tree args, int flags,
3030 /* These attributes may apply to structure and union types being created,
3031 but otherwise should pass to the declaration involved. */
3034 if (flags & ((int) ATTR_FLAG_DECL_NEXT | (int) ATTR_FLAG_FUNCTION_NEXT
3035 | (int) ATTR_FLAG_ARRAY_NEXT))
3037 *no_add_attrs = true;
3038 return tree_cons (name, args, NULL_TREE);
3040 if (TREE_CODE (node) != RECORD_TYPE && TREE_CODE (node) != UNION_TYPE)
3042 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name));
3043 *no_add_attrs = true;
3049 /* Report error on dllimport ambiguities seen now before they cause
3051 if (is_attribute_p ("dllimport", name))
3053 /* Like MS, treat definition of dllimported variables and
3054 non-inlined functions on declaration as syntax errors. We
3055 allow the attribute for function definitions if declared
3057 if (TREE_CODE (node) == FUNCTION_DECL && DECL_INITIAL (node)
3058 && !DECL_DECLARED_INLINE_P (node))
3060 error ("%Jfunction `%D' definition is marked dllimport.", node, node);
3061 *no_add_attrs = true;
3064 else if (TREE_CODE (node) == VAR_DECL)
3066 if (DECL_INITIAL (node))
3068 error ("%Jvariable `%D' definition is marked dllimport.",
3070 *no_add_attrs = true;
3073 /* `extern' needn't be specified with dllimport.
3074 Specify `extern' now and hope for the best. Sigh. */
3075 DECL_EXTERNAL (node) = 1;
3076 /* Also, implicitly give dllimport'd variables declared within
3077 a function global scope, unless declared static. */
3078 if (current_function_decl != NULL_TREE && !TREE_STATIC (node))
3079 TREE_PUBLIC (node) = 1;
3083 /* Report error if symbol is not accessible at global scope. */
3084 if (!TREE_PUBLIC (node)
3085 && (TREE_CODE (node) == VAR_DECL
3086 || TREE_CODE (node) == FUNCTION_DECL))
3088 error ("%Jexternal linkage required for symbol '%D' because of "
3089 "'%s' attribute.", node, node, IDENTIFIER_POINTER (name));
3090 *no_add_attrs = true;
3096 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
3098 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
3099 of the various TYPE_QUAL values. */
3102 set_type_quals (tree type, int type_quals)
3104 TYPE_READONLY (type) = (type_quals & TYPE_QUAL_CONST) != 0;
3105 TYPE_VOLATILE (type) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
3106 TYPE_RESTRICT (type) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
3109 /* Returns true iff cand is equivalent to base with type_quals. */
3112 check_qualified_type (tree cand, tree base, int type_quals)
3114 return (TYPE_QUALS (cand) == type_quals
3115 && TYPE_NAME (cand) == TYPE_NAME (base)
3116 /* Apparently this is needed for Objective-C. */
3117 && TYPE_CONTEXT (cand) == TYPE_CONTEXT (base)
3118 && attribute_list_equal (TYPE_ATTRIBUTES (cand),
3119 TYPE_ATTRIBUTES (base)));
3122 /* Return a version of the TYPE, qualified as indicated by the
3123 TYPE_QUALS, if one exists. If no qualified version exists yet,
3124 return NULL_TREE. */
3127 get_qualified_type (tree type, int type_quals)
3131 if (TYPE_QUALS (type) == type_quals)
3134 /* Search the chain of variants to see if there is already one there just
3135 like the one we need to have. If so, use that existing one. We must
3136 preserve the TYPE_NAME, since there is code that depends on this. */
3137 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
3138 if (check_qualified_type (t, type, type_quals))
3144 /* Like get_qualified_type, but creates the type if it does not
3145 exist. This function never returns NULL_TREE. */
3148 build_qualified_type (tree type, int type_quals)
3152 /* See if we already have the appropriate qualified variant. */
3153 t = get_qualified_type (type, type_quals);
3155 /* If not, build it. */
3158 t = build_variant_type_copy (type);
3159 set_type_quals (t, type_quals);
3165 /* Create a new distinct copy of TYPE. The new type is made its own
3169 build_distinct_type_copy (tree type)
3171 tree t = copy_node (type);
3173 TYPE_POINTER_TO (t) = 0;
3174 TYPE_REFERENCE_TO (t) = 0;
3176 /* Make it its own variant. */
3177 TYPE_MAIN_VARIANT (t) = t;
3178 TYPE_NEXT_VARIANT (t) = 0;
3183 /* Create a new variant of TYPE, equivalent but distinct.
3184 This is so the caller can modify it. */
3187 build_variant_type_copy (tree type)
3189 tree t, m = TYPE_MAIN_VARIANT (type);
3191 t = build_distinct_type_copy (type);
3193 /* Add the new type to the chain of variants of TYPE. */
3194 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (m);
3195 TYPE_NEXT_VARIANT (m) = t;
3196 TYPE_MAIN_VARIANT (t) = m;
3201 /* Hashing of types so that we don't make duplicates.
3202 The entry point is `type_hash_canon'. */
3204 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
3205 with types in the TREE_VALUE slots), by adding the hash codes
3206 of the individual types. */
3209 type_hash_list (tree list, hashval_t hashcode)
3213 for (tail = list; tail; tail = TREE_CHAIN (tail))
3214 if (TREE_VALUE (tail) != error_mark_node)
3215 hashcode = iterative_hash_object (TYPE_HASH (TREE_VALUE (tail)),
3221 /* These are the Hashtable callback functions. */
3223 /* Returns true iff the types are equivalent. */
3226 type_hash_eq (const void *va, const void *vb)
3228 const struct type_hash *a = va, *b = vb;
3230 /* First test the things that are the same for all types. */
3231 if (a->hash != b->hash
3232 || TREE_CODE (a->type) != TREE_CODE (b->type)
3233 || TREE_TYPE (a->type) != TREE_TYPE (b->type)
3234 || !attribute_list_equal (TYPE_ATTRIBUTES (a->type),
3235 TYPE_ATTRIBUTES (b->type))
3236 || TYPE_ALIGN (a->type) != TYPE_ALIGN (b->type)
3237 || TYPE_MODE (a->type) != TYPE_MODE (b->type))
3240 switch (TREE_CODE (a->type))
3246 case REFERENCE_TYPE:
3250 if (TYPE_VALUES (a->type) != TYPE_VALUES (b->type)
3251 && !(TYPE_VALUES (a->type)
3252 && TREE_CODE (TYPE_VALUES (a->type)) == TREE_LIST
3253 && TYPE_VALUES (b->type)
3254 && TREE_CODE (TYPE_VALUES (b->type)) == TREE_LIST
3255 && type_list_equal (TYPE_VALUES (a->type),
3256 TYPE_VALUES (b->type))))
3259 /* ... fall through ... */
3265 return ((TYPE_MAX_VALUE (a->type) == TYPE_MAX_VALUE (b->type)
3266 || tree_int_cst_equal (TYPE_MAX_VALUE (a->type),
3267 TYPE_MAX_VALUE (b->type)))
3268 && (TYPE_MIN_VALUE (a->type) == TYPE_MIN_VALUE (b->type)
3269 || tree_int_cst_equal (TYPE_MIN_VALUE (a->type),
3270 TYPE_MIN_VALUE (b->type))));
3273 return TYPE_OFFSET_BASETYPE (a->type) == TYPE_OFFSET_BASETYPE (b->type);
3276 return (TYPE_METHOD_BASETYPE (a->type) == TYPE_METHOD_BASETYPE (b->type)
3277 && (TYPE_ARG_TYPES (a->type) == TYPE_ARG_TYPES (b->type)
3278 || (TYPE_ARG_TYPES (a->type)
3279 && TREE_CODE (TYPE_ARG_TYPES (a->type)) == TREE_LIST
3280 && TYPE_ARG_TYPES (b->type)
3281 && TREE_CODE (TYPE_ARG_TYPES (b->type)) == TREE_LIST
3282 && type_list_equal (TYPE_ARG_TYPES (a->type),
3283 TYPE_ARG_TYPES (b->type)))));
3287 return TYPE_DOMAIN (a->type) == TYPE_DOMAIN (b->type);
3291 case QUAL_UNION_TYPE:
3292 return (TYPE_FIELDS (a->type) == TYPE_FIELDS (b->type)
3293 || (TYPE_FIELDS (a->type)
3294 && TREE_CODE (TYPE_FIELDS (a->type)) == TREE_LIST
3295 && TYPE_FIELDS (b->type)
3296 && TREE_CODE (TYPE_FIELDS (b->type)) == TREE_LIST
3297 && type_list_equal (TYPE_FIELDS (a->type),
3298 TYPE_FIELDS (b->type))));
3301 return (TYPE_ARG_TYPES (a->type) == TYPE_ARG_TYPES (b->type)
3302 || (TYPE_ARG_TYPES (a->type)
3303 && TREE_CODE (TYPE_ARG_TYPES (a->type)) == TREE_LIST
3304 && TYPE_ARG_TYPES (b->type)
3305 && TREE_CODE (TYPE_ARG_TYPES (b->type)) == TREE_LIST
3306 && type_list_equal (TYPE_ARG_TYPES (a->type),
3307 TYPE_ARG_TYPES (b->type))));
3314 /* Return the cached hash value. */
3317 type_hash_hash (const void *item)
3319 return ((const struct type_hash *) item)->hash;
3322 /* Look in the type hash table for a type isomorphic to TYPE.
3323 If one is found, return it. Otherwise return 0. */
3326 type_hash_lookup (hashval_t hashcode, tree type)
3328 struct type_hash *h, in;
3330 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
3331 must call that routine before comparing TYPE_ALIGNs. */
3337 h = htab_find_with_hash (type_hash_table, &in, hashcode);
3343 /* Add an entry to the type-hash-table
3344 for a type TYPE whose hash code is HASHCODE. */
3347 type_hash_add (hashval_t hashcode, tree type)
3349 struct type_hash *h;
3352 h = ggc_alloc (sizeof (struct type_hash));
3355 loc = htab_find_slot_with_hash (type_hash_table, h, hashcode, INSERT);
3356 *(struct type_hash **) loc = h;
3359 /* Given TYPE, and HASHCODE its hash code, return the canonical
3360 object for an identical type if one already exists.
3361 Otherwise, return TYPE, and record it as the canonical object.
3363 To use this function, first create a type of the sort you want.
3364 Then compute its hash code from the fields of the type that
3365 make it different from other similar types.
3366 Then call this function and use the value. */
3369 type_hash_canon (unsigned int hashcode, tree type)
3373 /* The hash table only contains main variants, so ensure that's what we're
3375 if (TYPE_MAIN_VARIANT (type) != type)
3378 if (!lang_hooks.types.hash_types)
3381 /* See if the type is in the hash table already. If so, return it.
3382 Otherwise, add the type. */
3383 t1 = type_hash_lookup (hashcode, type);
3386 #ifdef GATHER_STATISTICS
3387 tree_node_counts[(int) t_kind]--;
3388 tree_node_sizes[(int) t_kind] -= sizeof (struct tree_type);
3394 type_hash_add (hashcode, type);
3399 /* See if the data pointed to by the type hash table is marked. We consider
3400 it marked if the type is marked or if a debug type number or symbol
3401 table entry has been made for the type. This reduces the amount of
3402 debugging output and eliminates that dependency of the debug output on
3403 the number of garbage collections. */
3406 type_hash_marked_p (const void *p)
3408 tree type = ((struct type_hash *) p)->type;
3410 return ggc_marked_p (type) || TYPE_SYMTAB_POINTER (type);
3414 print_type_hash_statistics (void)
3416 fprintf (stderr, "Type hash: size %ld, %ld elements, %f collisions\n",
3417 (long) htab_size (type_hash_table),
3418 (long) htab_elements (type_hash_table),
3419 htab_collisions (type_hash_table));
3422 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
3423 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
3424 by adding the hash codes of the individual attributes. */
3427 attribute_hash_list (tree list, hashval_t hashcode)
3431 for (tail = list; tail; tail = TREE_CHAIN (tail))
3432 /* ??? Do we want to add in TREE_VALUE too? */
3433 hashcode = iterative_hash_object
3434 (IDENTIFIER_HASH_VALUE (TREE_PURPOSE (tail)), hashcode);
3438 /* Given two lists of attributes, return true if list l2 is
3439 equivalent to l1. */
3442 attribute_list_equal (tree l1, tree l2)
3444 return attribute_list_contained (l1, l2)
3445 && attribute_list_contained (l2, l1);
3448 /* Given two lists of attributes, return true if list L2 is
3449 completely contained within L1. */
3450 /* ??? This would be faster if attribute names were stored in a canonicalized
3451 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
3452 must be used to show these elements are equivalent (which they are). */
3453 /* ??? It's not clear that attributes with arguments will always be handled
3457 attribute_list_contained (tree l1, tree l2)
3461 /* First check the obvious, maybe the lists are identical. */
3465 /* Maybe the lists are similar. */
3466 for (t1 = l1, t2 = l2;
3468 && TREE_PURPOSE (t1) == TREE_PURPOSE (t2)
3469 && TREE_VALUE (t1) == TREE_VALUE (t2);
3470 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2));
3472 /* Maybe the lists are equal. */
3473 if (t1 == 0 && t2 == 0)
3476 for (; t2 != 0; t2 = TREE_CHAIN (t2))
3479 for (attr = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)), l1);
3481 attr = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)),
3484 if (simple_cst_equal (TREE_VALUE (t2), TREE_VALUE (attr)) == 1)
3491 if (simple_cst_equal (TREE_VALUE (t2), TREE_VALUE (attr)) != 1)
3498 /* Given two lists of types
3499 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
3500 return 1 if the lists contain the same types in the same order.
3501 Also, the TREE_PURPOSEs must match. */
3504 type_list_equal (tree l1, tree l2)
3508 for (t1 = l1, t2 = l2; t1 && t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
3509 if (TREE_VALUE (t1) != TREE_VALUE (t2)
3510 || (TREE_PURPOSE (t1) != TREE_PURPOSE (t2)
3511 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2))
3512 && (TREE_TYPE (TREE_PURPOSE (t1))
3513 == TREE_TYPE (TREE_PURPOSE (t2))))))
3519 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
3520 given by TYPE. If the argument list accepts variable arguments,
3521 then this function counts only the ordinary arguments. */
3524 type_num_arguments (tree type)
3529 for (t = TYPE_ARG_TYPES (type); t; t = TREE_CHAIN (t))
3530 /* If the function does not take a variable number of arguments,
3531 the last element in the list will have type `void'. */
3532 if (VOID_TYPE_P (TREE_VALUE (t)))
3540 /* Nonzero if integer constants T1 and T2
3541 represent the same constant value. */
3544 tree_int_cst_equal (tree t1, tree t2)
3549 if (t1 == 0 || t2 == 0)
3552 if (TREE_CODE (t1) == INTEGER_CST
3553 && TREE_CODE (t2) == INTEGER_CST
3554 && TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
3555 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2))
3561 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
3562 The precise way of comparison depends on their data type. */
3565 tree_int_cst_lt (tree t1, tree t2)
3570 if (TYPE_UNSIGNED (TREE_TYPE (t1)) != TYPE_UNSIGNED (TREE_TYPE (t2)))
3572 int t1_sgn = tree_int_cst_sgn (t1);
3573 int t2_sgn = tree_int_cst_sgn (t2);
3575 if (t1_sgn < t2_sgn)
3577 else if (t1_sgn > t2_sgn)
3579 /* Otherwise, both are non-negative, so we compare them as
3580 unsigned just in case one of them would overflow a signed
3583 else if (!TYPE_UNSIGNED (TREE_TYPE (t1)))
3584 return INT_CST_LT (t1, t2);
3586 return INT_CST_LT_UNSIGNED (t1, t2);
3589 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
3592 tree_int_cst_compare (tree t1, tree t2)
3594 if (tree_int_cst_lt (t1, t2))
3596 else if (tree_int_cst_lt (t2, t1))
3602 /* Return 1 if T is an INTEGER_CST that can be manipulated efficiently on
3603 the host. If POS is zero, the value can be represented in a single
3604 HOST_WIDE_INT. If POS is nonzero, the value must be positive and can
3605 be represented in a single unsigned HOST_WIDE_INT. */
3608 host_integerp (tree t, int pos)
3610 return (TREE_CODE (t) == INTEGER_CST
3611 && ! TREE_OVERFLOW (t)
3612 && ((TREE_INT_CST_HIGH (t) == 0
3613 && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) >= 0)
3614 || (! pos && TREE_INT_CST_HIGH (t) == -1
3615 && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0
3616 && !TYPE_UNSIGNED (TREE_TYPE (t)))
3617 || (pos && TREE_INT_CST_HIGH (t) == 0)));
3620 /* Return the HOST_WIDE_INT least significant bits of T if it is an
3621 INTEGER_CST and there is no overflow. POS is nonzero if the result must
3622 be positive. Abort if we cannot satisfy the above conditions. */
3625 tree_low_cst (tree t, int pos)
3627 if (host_integerp (t, pos))
3628 return TREE_INT_CST_LOW (t);
3633 /* Return the most significant bit of the integer constant T. */
3636 tree_int_cst_msb (tree t)
3640 unsigned HOST_WIDE_INT l;
3642 /* Note that using TYPE_PRECISION here is wrong. We care about the
3643 actual bits, not the (arbitrary) range of the type. */
3644 prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t))) - 1;
3645 rshift_double (TREE_INT_CST_LOW (t), TREE_INT_CST_HIGH (t), prec,
3646 2 * HOST_BITS_PER_WIDE_INT, &l, &h, 0);
3647 return (l & 1) == 1;
3650 /* Return an indication of the sign of the integer constant T.
3651 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
3652 Note that -1 will never be returned it T's type is unsigned. */
3655 tree_int_cst_sgn (tree t)
3657 if (TREE_INT_CST_LOW (t) == 0 && TREE_INT_CST_HIGH (t) == 0)
3659 else if (TYPE_UNSIGNED (TREE_TYPE (t)))
3661 else if (TREE_INT_CST_HIGH (t) < 0)
3667 /* Compare two constructor-element-type constants. Return 1 if the lists
3668 are known to be equal; otherwise return 0. */
3671 simple_cst_list_equal (tree l1, tree l2)
3673 while (l1 != NULL_TREE && l2 != NULL_TREE)
3675 if (simple_cst_equal (TREE_VALUE (l1), TREE_VALUE (l2)) != 1)
3678 l1 = TREE_CHAIN (l1);
3679 l2 = TREE_CHAIN (l2);
3685 /* Return truthvalue of whether T1 is the same tree structure as T2.
3686 Return 1 if they are the same.
3687 Return 0 if they are understandably different.
3688 Return -1 if either contains tree structure not understood by
3692 simple_cst_equal (tree t1, tree t2)
3694 enum tree_code code1, code2;
3700 if (t1 == 0 || t2 == 0)
3703 code1 = TREE_CODE (t1);
3704 code2 = TREE_CODE (t2);
3706 if (code1 == NOP_EXPR || code1 == CONVERT_EXPR || code1 == NON_LVALUE_EXPR)
3708 if (code2 == NOP_EXPR || code2 == CONVERT_EXPR
3709 || code2 == NON_LVALUE_EXPR)
3710 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3712 return simple_cst_equal (TREE_OPERAND (t1, 0), t2);
3715 else if (code2 == NOP_EXPR || code2 == CONVERT_EXPR
3716 || code2 == NON_LVALUE_EXPR)
3717 return simple_cst_equal (t1, TREE_OPERAND (t2, 0));
3725 return (TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
3726 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2));
3729 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
3732 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
3733 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
3734 TREE_STRING_LENGTH (t1)));
3737 return simple_cst_list_equal (CONSTRUCTOR_ELTS (t1),
3738 CONSTRUCTOR_ELTS (t2));
3741 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3744 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3748 simple_cst_list_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
3751 /* Special case: if either target is an unallocated VAR_DECL,
3752 it means that it's going to be unified with whatever the
3753 TARGET_EXPR is really supposed to initialize, so treat it
3754 as being equivalent to anything. */
3755 if ((TREE_CODE (TREE_OPERAND (t1, 0)) == VAR_DECL
3756 && DECL_NAME (TREE_OPERAND (t1, 0)) == NULL_TREE
3757 && !DECL_RTL_SET_P (TREE_OPERAND (t1, 0)))
3758 || (TREE_CODE (TREE_OPERAND (t2, 0)) == VAR_DECL
3759 && DECL_NAME (TREE_OPERAND (t2, 0)) == NULL_TREE
3760 && !DECL_RTL_SET_P (TREE_OPERAND (t2, 0))))
3763 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3768 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
3770 case WITH_CLEANUP_EXPR:
3771 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3775 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t1, 1));
3778 if (TREE_OPERAND (t1, 1) == TREE_OPERAND (t2, 1))
3779 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3793 /* This general rule works for most tree codes. All exceptions should be
3794 handled above. If this is a language-specific tree code, we can't
3795 trust what might be in the operand, so say we don't know
3797 if ((int) code1 >= (int) LAST_AND_UNUSED_TREE_CODE)
3800 switch (TREE_CODE_CLASS (code1))
3809 for (i = 0; i < TREE_CODE_LENGTH (code1); i++)
3811 cmp = simple_cst_equal (TREE_OPERAND (t1, i), TREE_OPERAND (t2, i));
3823 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
3824 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
3825 than U, respectively. */
3828 compare_tree_int (tree t, unsigned HOST_WIDE_INT u)
3830 if (tree_int_cst_sgn (t) < 0)
3832 else if (TREE_INT_CST_HIGH (t) != 0)
3834 else if (TREE_INT_CST_LOW (t) == u)
3836 else if (TREE_INT_CST_LOW (t) < u)
3842 /* Return true if CODE represents an associative tree code. Otherwise
3845 associative_tree_code (enum tree_code code)
3864 /* Return true if CODE represents an commutative tree code. Otherwise
3867 commutative_tree_code (enum tree_code code)
3880 case UNORDERED_EXPR:
3884 case TRUTH_AND_EXPR:
3885 case TRUTH_XOR_EXPR:
3895 /* Generate a hash value for an expression. This can be used iteratively
3896 by passing a previous result as the "val" argument.
3898 This function is intended to produce the same hash for expressions which
3899 would compare equal using operand_equal_p. */
3902 iterative_hash_expr (tree t, hashval_t val)
3905 enum tree_code code;
3909 return iterative_hash_object (t, val);
3911 code = TREE_CODE (t);
3912 class = TREE_CODE_CLASS (code);
3915 || TREE_CODE (t) == VALUE_HANDLE)
3917 /* Decls we can just compare by pointer. */
3918 val = iterative_hash_object (t, val);
3920 else if (class == 'c')
3922 /* Alas, constants aren't shared, so we can't rely on pointer
3924 if (code == INTEGER_CST)
3926 val = iterative_hash_object (TREE_INT_CST_LOW (t), val);
3927 val = iterative_hash_object (TREE_INT_CST_HIGH (t), val);
3929 else if (code == REAL_CST)
3931 unsigned int val2 = real_hash (TREE_REAL_CST_PTR (t));
3933 val = iterative_hash (&val2, sizeof (unsigned int), val);
3935 else if (code == STRING_CST)
3936 val = iterative_hash (TREE_STRING_POINTER (t),
3937 TREE_STRING_LENGTH (t), val);
3938 else if (code == COMPLEX_CST)
3940 val = iterative_hash_expr (TREE_REALPART (t), val);
3941 val = iterative_hash_expr (TREE_IMAGPART (t), val);
3943 else if (code == VECTOR_CST)
3944 val = iterative_hash_expr (TREE_VECTOR_CST_ELTS (t), val);
3948 else if (IS_EXPR_CODE_CLASS (class))
3950 val = iterative_hash_object (code, val);
3952 /* Don't hash the type, that can lead to having nodes which
3953 compare equal according to operand_equal_p, but which
3954 have different hash codes. */
3955 if (code == NOP_EXPR
3956 || code == CONVERT_EXPR
3957 || code == NON_LVALUE_EXPR)
3959 /* Make sure to include signness in the hash computation. */
3960 val += TYPE_UNSIGNED (TREE_TYPE (t));
3961 val = iterative_hash_expr (TREE_OPERAND (t, 0), val);
3964 if (commutative_tree_code (code))
3966 /* It's a commutative expression. We want to hash it the same
3967 however it appears. We do this by first hashing both operands
3968 and then rehashing based on the order of their independent
3970 hashval_t one = iterative_hash_expr (TREE_OPERAND (t, 0), 0);
3971 hashval_t two = iterative_hash_expr (TREE_OPERAND (t, 1), 0);
3975 t = one, one = two, two = t;
3977 val = iterative_hash_object (one, val);
3978 val = iterative_hash_object (two, val);
3981 for (i = first_rtl_op (code) - 1; i >= 0; --i)
3982 val = iterative_hash_expr (TREE_OPERAND (t, i), val);
3984 else if (code == TREE_LIST)
3986 /* A list of expressions, for a CALL_EXPR or as the elements of a
3988 for (; t; t = TREE_CHAIN (t))
3989 val = iterative_hash_expr (TREE_VALUE (t), val);
3991 else if (code == SSA_NAME)
3993 val = iterative_hash_object (SSA_NAME_VERSION (t), val);
3994 val = iterative_hash_expr (SSA_NAME_VAR (t), val);
4002 /* Constructors for pointer, array and function types.
4003 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
4004 constructed by language-dependent code, not here.) */
4006 /* Construct, lay out and return the type of pointers to TO_TYPE with
4007 mode MODE. If CAN_ALIAS_ALL is TRUE, indicate this type can
4008 reference all of memory. If such a type has already been
4009 constructed, reuse it. */
4012 build_pointer_type_for_mode (tree to_type, enum machine_mode mode,
4017 /* In some cases, languages will have things that aren't a POINTER_TYPE
4018 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_POINTER_TO.
4019 In that case, return that type without regard to the rest of our
4022 ??? This is a kludge, but consistent with the way this function has
4023 always operated and there doesn't seem to be a good way to avoid this
4025 if (TYPE_POINTER_TO (to_type) != 0
4026 && TREE_CODE (TYPE_POINTER_TO (to_type)) != POINTER_TYPE)
4027 return TYPE_POINTER_TO (to_type);
4029 /* First, if we already have a type for pointers to TO_TYPE and it's
4030 the proper mode, use it. */
4031 for (t = TYPE_POINTER_TO (to_type); t; t = TYPE_NEXT_PTR_TO (t))
4032 if (TYPE_MODE (t) == mode && TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
4035 t = make_node (POINTER_TYPE);
4037 TREE_TYPE (t) = to_type;
4038 TYPE_MODE (t) = mode;
4039 TYPE_REF_CAN_ALIAS_ALL (t) = can_alias_all;
4040 TYPE_NEXT_PTR_TO (t) = TYPE_POINTER_TO (to_type);
4041 TYPE_POINTER_TO (to_type) = t;
4043 /* Lay out the type. This function has many callers that are concerned
4044 with expression-construction, and this simplifies them all. */
4050 /* By default build pointers in ptr_mode. */
4053 build_pointer_type (tree to_type)
4055 return build_pointer_type_for_mode (to_type, ptr_mode, false);
4058 /* Same as build_pointer_type_for_mode, but for REFERENCE_TYPE. */
4061 build_reference_type_for_mode (tree to_type, enum machine_mode mode,
4066 /* In some cases, languages will have things that aren't a REFERENCE_TYPE
4067 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_REFERENCE_TO.
4068 In that case, return that type without regard to the rest of our
4071 ??? This is a kludge, but consistent with the way this function has
4072 always operated and there doesn't seem to be a good way to avoid this
4074 if (TYPE_REFERENCE_TO (to_type) != 0
4075 && TREE_CODE (TYPE_REFERENCE_TO (to_type)) != REFERENCE_TYPE)
4076 return TYPE_REFERENCE_TO (to_type);
4078 /* First, if we already have a type for pointers to TO_TYPE and it's
4079 the proper mode, use it. */
4080 for (t = TYPE_REFERENCE_TO (to_type); t; t = TYPE_NEXT_REF_TO (t))
4081 if (TYPE_MODE (t) == mode && TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
4084 t = make_node (REFERENCE_TYPE);
4086 TREE_TYPE (t) = to_type;
4087 TYPE_MODE (t) = mode;
4088 TYPE_REF_CAN_ALIAS_ALL (t) = can_alias_all;
4089 TYPE_NEXT_REF_TO (t) = TYPE_REFERENCE_TO (to_type);
4090 TYPE_REFERENCE_TO (to_type) = t;
4098 /* Build the node for the type of references-to-TO_TYPE by default
4102 build_reference_type (tree to_type)
4104 return build_reference_type_for_mode (to_type, ptr_mode, false);
4107 /* Build a type that is compatible with t but has no cv quals anywhere
4110 const char *const *const * -> char ***. */
4113 build_type_no_quals (tree t)
4115 switch (TREE_CODE (t))
4118 return build_pointer_type_for_mode (build_type_no_quals (TREE_TYPE (t)),
4120 TYPE_REF_CAN_ALIAS_ALL (t));
4121 case REFERENCE_TYPE:
4123 build_reference_type_for_mode (build_type_no_quals (TREE_TYPE (t)),
4125 TYPE_REF_CAN_ALIAS_ALL (t));
4127 return TYPE_MAIN_VARIANT (t);
4131 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
4132 MAXVAL should be the maximum value in the domain
4133 (one less than the length of the array).
4135 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
4136 We don't enforce this limit, that is up to caller (e.g. language front end).
4137 The limit exists because the result is a signed type and we don't handle
4138 sizes that use more than one HOST_WIDE_INT. */
4141 build_index_type (tree maxval)
4143 tree itype = make_node (INTEGER_TYPE);
4145 TREE_TYPE (itype) = sizetype;
4146 TYPE_PRECISION (itype) = TYPE_PRECISION (sizetype);
4147 TYPE_MIN_VALUE (itype) = size_zero_node;
4148 TYPE_MAX_VALUE (itype) = convert (sizetype, maxval);
4149 TYPE_MODE (itype) = TYPE_MODE (sizetype);
4150 TYPE_SIZE (itype) = TYPE_SIZE (sizetype);
4151 TYPE_SIZE_UNIT (itype) = TYPE_SIZE_UNIT (sizetype);
4152 TYPE_ALIGN (itype) = TYPE_ALIGN (sizetype);
4153 TYPE_USER_ALIGN (itype) = TYPE_USER_ALIGN (sizetype);
4155 if (host_integerp (maxval, 1))
4156 return type_hash_canon (tree_low_cst (maxval, 1), itype);
4161 /* Builds a signed or unsigned integer type of precision PRECISION.
4162 Used for C bitfields whose precision does not match that of
4163 built-in target types. */
4165 build_nonstandard_integer_type (unsigned HOST_WIDE_INT precision,
4168 tree itype = make_node (INTEGER_TYPE);
4170 TYPE_PRECISION (itype) = precision;
4173 fixup_unsigned_type (itype);
4175 fixup_signed_type (itype);
4177 if (host_integerp (TYPE_MAX_VALUE (itype), 1))
4178 return type_hash_canon (tree_low_cst (TYPE_MAX_VALUE (itype), 1), itype);
4183 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
4184 ENUMERAL_TYPE, BOOLEAN_TYPE, or CHAR_TYPE), with
4185 low bound LOWVAL and high bound HIGHVAL.
4186 if TYPE==NULL_TREE, sizetype is used. */
4189 build_range_type (tree type, tree lowval, tree highval)
4191 tree itype = make_node (INTEGER_TYPE);
4193 TREE_TYPE (itype) = type;
4194 if (type == NULL_TREE)
4197 TYPE_MIN_VALUE (itype) = convert (type, lowval);
4198 TYPE_MAX_VALUE (itype) = highval ? convert (type, highval) : NULL;
4200 TYPE_PRECISION (itype) = TYPE_PRECISION (type);
4201 TYPE_MODE (itype) = TYPE_MODE (type);
4202 TYPE_SIZE (itype) = TYPE_SIZE (type);
4203 TYPE_SIZE_UNIT (itype) = TYPE_SIZE_UNIT (type);
4204 TYPE_ALIGN (itype) = TYPE_ALIGN (type);
4205 TYPE_USER_ALIGN (itype) = TYPE_USER_ALIGN (type);
4207 if (host_integerp (lowval, 0) && highval != 0 && host_integerp (highval, 0))
4208 return type_hash_canon (tree_low_cst (highval, 0)
4209 - tree_low_cst (lowval, 0),
4215 /* Just like build_index_type, but takes lowval and highval instead
4216 of just highval (maxval). */
4219 build_index_2_type (tree lowval, tree highval)
4221 return build_range_type (sizetype, lowval, highval);
4224 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
4225 and number of elements specified by the range of values of INDEX_TYPE.
4226 If such a type has already been constructed, reuse it. */
4229 build_array_type (tree elt_type, tree index_type)
4232 hashval_t hashcode = 0;
4234 if (TREE_CODE (elt_type) == FUNCTION_TYPE)
4236 error ("arrays of functions are not meaningful");
4237 elt_type = integer_type_node;
4240 t = make_node (ARRAY_TYPE);
4241 TREE_TYPE (t) = elt_type;
4242 TYPE_DOMAIN (t) = index_type;
4244 if (index_type == 0)
4247 hashcode = iterative_hash_object (TYPE_HASH (elt_type), hashcode);
4248 hashcode = iterative_hash_object (TYPE_HASH (index_type), hashcode);
4249 t = type_hash_canon (hashcode, t);
4251 if (!COMPLETE_TYPE_P (t))
4256 /* Return the TYPE of the elements comprising
4257 the innermost dimension of ARRAY. */
4260 get_inner_array_type (tree array)
4262 tree type = TREE_TYPE (array);
4264 while (TREE_CODE (type) == ARRAY_TYPE)
4265 type = TREE_TYPE (type);
4270 /* Construct, lay out and return
4271 the type of functions returning type VALUE_TYPE
4272 given arguments of types ARG_TYPES.
4273 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
4274 are data type nodes for the arguments of the function.
4275 If such a type has already been constructed, reuse it. */
4278 build_function_type (tree value_type, tree arg_types)
4281 hashval_t hashcode = 0;
4283 if (TREE_CODE (value_type) == FUNCTION_TYPE)
4285 error ("function return type cannot be function");
4286 value_type = integer_type_node;
4289 /* Make a node of the sort we want. */
4290 t = make_node (FUNCTION_TYPE);
4291 TREE_TYPE (t) = value_type;
4292 TYPE_ARG_TYPES (t) = arg_types;
4294 /* If we already have such a type, use the old one. */
4295 hashcode = iterative_hash_object (TYPE_HASH (value_type), hashcode);
4296 hashcode = type_hash_list (arg_types, hashcode);
4297 t = type_hash_canon (hashcode, t);
4299 if (!COMPLETE_TYPE_P (t))
4304 /* Build a function type. The RETURN_TYPE is the type returned by the
4305 function. If additional arguments are provided, they are
4306 additional argument types. The list of argument types must always
4307 be terminated by NULL_TREE. */
4310 build_function_type_list (tree return_type, ...)
4315 va_start (p, return_type);
4317 t = va_arg (p, tree);
4318 for (args = NULL_TREE; t != NULL_TREE; t = va_arg (p, tree))
4319 args = tree_cons (NULL_TREE, t, args);
4322 args = nreverse (args);
4323 TREE_CHAIN (last) = void_list_node;
4324 args = build_function_type (return_type, args);
4330 /* Build a METHOD_TYPE for a member of BASETYPE. The RETTYPE (a TYPE)
4331 and ARGTYPES (a TREE_LIST) are the return type and arguments types
4332 for the method. An implicit additional parameter (of type
4333 pointer-to-BASETYPE) is added to the ARGTYPES. */
4336 build_method_type_directly (tree basetype,
4344 /* Make a node of the sort we want. */
4345 t = make_node (METHOD_TYPE);
4347 TYPE_METHOD_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
4348 TREE_TYPE (t) = rettype;
4349 ptype = build_pointer_type (basetype);
4351 /* The actual arglist for this function includes a "hidden" argument
4352 which is "this". Put it into the list of argument types. */
4353 argtypes = tree_cons (NULL_TREE, ptype, argtypes);
4354 TYPE_ARG_TYPES (t) = argtypes;
4356 /* If we already have such a type, use the old one. */
4357 hashcode = iterative_hash_object (TYPE_HASH (basetype), hashcode);
4358 hashcode = iterative_hash_object (TYPE_HASH (rettype), hashcode);
4359 hashcode = type_hash_list (argtypes, hashcode);
4360 t = type_hash_canon (hashcode, t);
4362 if (!COMPLETE_TYPE_P (t))
4368 /* Construct, lay out and return the type of methods belonging to class
4369 BASETYPE and whose arguments and values are described by TYPE.
4370 If that type exists already, reuse it.
4371 TYPE must be a FUNCTION_TYPE node. */
4374 build_method_type (tree basetype, tree type)
4376 if (TREE_CODE (type) != FUNCTION_TYPE)
4379 return build_method_type_directly (basetype,
4381 TYPE_ARG_TYPES (type));
4384 /* Construct, lay out and return the type of offsets to a value
4385 of type TYPE, within an object of type BASETYPE.
4386 If a suitable offset type exists already, reuse it. */
4389 build_offset_type (tree basetype, tree type)
4392 hashval_t hashcode = 0;
4394 /* Make a node of the sort we want. */
4395 t = make_node (OFFSET_TYPE);
4397 TYPE_OFFSET_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
4398 TREE_TYPE (t) = type;
4400 /* If we already have such a type, use the old one. */
4401 hashcode = iterative_hash_object (TYPE_HASH (basetype), hashcode);
4402 hashcode = iterative_hash_object (TYPE_HASH (type), hashcode);
4403 t = type_hash_canon (hashcode, t);
4405 if (!COMPLETE_TYPE_P (t))
4411 /* Create a complex type whose components are COMPONENT_TYPE. */
4414 build_complex_type (tree component_type)
4419 /* Make a node of the sort we want. */
4420 t = make_node (COMPLEX_TYPE);
4422 TREE_TYPE (t) = TYPE_MAIN_VARIANT (component_type);
4424 /* If we already have such a type, use the old one. */
4425 hashcode = iterative_hash_object (TYPE_HASH (component_type), 0);
4426 t = type_hash_canon (hashcode, t);
4428 if (!COMPLETE_TYPE_P (t))
4431 /* If we are writing Dwarf2 output we need to create a name,
4432 since complex is a fundamental type. */
4433 if ((write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4437 if (component_type == char_type_node)
4438 name = "complex char";
4439 else if (component_type == signed_char_type_node)
4440 name = "complex signed char";
4441 else if (component_type == unsigned_char_type_node)
4442 name = "complex unsigned char";
4443 else if (component_type == short_integer_type_node)
4444 name = "complex short int";
4445 else if (component_type == short_unsigned_type_node)
4446 name = "complex short unsigned int";
4447 else if (component_type == integer_type_node)
4448 name = "complex int";
4449 else if (component_type == unsigned_type_node)
4450 name = "complex unsigned int";
4451 else if (component_type == long_integer_type_node)
4452 name = "complex long int";
4453 else if (component_type == long_unsigned_type_node)
4454 name = "complex long unsigned int";
4455 else if (component_type == long_long_integer_type_node)
4456 name = "complex long long int";
4457 else if (component_type == long_long_unsigned_type_node)
4458 name = "complex long long unsigned int";
4463 TYPE_NAME (t) = get_identifier (name);
4466 return build_qualified_type (t, TYPE_QUALS (component_type));
4469 /* Return OP, stripped of any conversions to wider types as much as is safe.
4470 Converting the value back to OP's type makes a value equivalent to OP.
4472 If FOR_TYPE is nonzero, we return a value which, if converted to
4473 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
4475 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
4476 narrowest type that can hold the value, even if they don't exactly fit.
4477 Otherwise, bit-field references are changed to a narrower type
4478 only if they can be fetched directly from memory in that type.
4480 OP must have integer, real or enumeral type. Pointers are not allowed!
4482 There are some cases where the obvious value we could return
4483 would regenerate to OP if converted to OP's type,
4484 but would not extend like OP to wider types.
4485 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
4486 For example, if OP is (unsigned short)(signed char)-1,
4487 we avoid returning (signed char)-1 if FOR_TYPE is int,
4488 even though extending that to an unsigned short would regenerate OP,
4489 since the result of extending (signed char)-1 to (int)
4490 is different from (int) OP. */
4493 get_unwidened (tree op, tree for_type)
4495 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
4496 tree type = TREE_TYPE (op);
4498 = TYPE_PRECISION (for_type != 0 ? for_type : type);
4500 = (for_type != 0 && for_type != type
4501 && final_prec > TYPE_PRECISION (type)
4502 && TYPE_UNSIGNED (type));
4505 while (TREE_CODE (op) == NOP_EXPR)
4508 = TYPE_PRECISION (TREE_TYPE (op))
4509 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0)));
4511 /* Truncations are many-one so cannot be removed.
4512 Unless we are later going to truncate down even farther. */
4514 && final_prec > TYPE_PRECISION (TREE_TYPE (op)))
4517 /* See what's inside this conversion. If we decide to strip it,
4519 op = TREE_OPERAND (op, 0);
4521 /* If we have not stripped any zero-extensions (uns is 0),
4522 we can strip any kind of extension.
4523 If we have previously stripped a zero-extension,
4524 only zero-extensions can safely be stripped.
4525 Any extension can be stripped if the bits it would produce
4526 are all going to be discarded later by truncating to FOR_TYPE. */
4530 if (! uns || final_prec <= TYPE_PRECISION (TREE_TYPE (op)))
4532 /* TYPE_UNSIGNED says whether this is a zero-extension.
4533 Let's avoid computing it if it does not affect WIN
4534 and if UNS will not be needed again. */
4535 if ((uns || TREE_CODE (op) == NOP_EXPR)
4536 && TYPE_UNSIGNED (TREE_TYPE (op)))
4544 if (TREE_CODE (op) == COMPONENT_REF
4545 /* Since type_for_size always gives an integer type. */
4546 && TREE_CODE (type) != REAL_TYPE
4547 /* Don't crash if field not laid out yet. */
4548 && DECL_SIZE (TREE_OPERAND (op, 1)) != 0
4549 && host_integerp (DECL_SIZE (TREE_OPERAND (op, 1)), 1))
4551 unsigned int innerprec
4552 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op, 1)), 1);
4553 int unsignedp = (DECL_UNSIGNED (TREE_OPERAND (op, 1))
4554 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op, 1))));
4555 type = lang_hooks.types.type_for_size (innerprec, unsignedp);
4557 /* We can get this structure field in the narrowest type it fits in.
4558 If FOR_TYPE is 0, do this only for a field that matches the
4559 narrower type exactly and is aligned for it
4560 The resulting extension to its nominal type (a fullword type)
4561 must fit the same conditions as for other extensions. */
4564 && INT_CST_LT_UNSIGNED (TYPE_SIZE (type), TYPE_SIZE (TREE_TYPE (op)))
4565 && (for_type || ! DECL_BIT_FIELD (TREE_OPERAND (op, 1)))
4566 && (! uns || final_prec <= innerprec || unsignedp))
4568 win = build3 (COMPONENT_REF, type, TREE_OPERAND (op, 0),
4569 TREE_OPERAND (op, 1), NULL_TREE);
4570 TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op);
4571 TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op);
4578 /* Return OP or a simpler expression for a narrower value
4579 which can be sign-extended or zero-extended to give back OP.
4580 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
4581 or 0 if the value should be sign-extended. */
4584 get_narrower (tree op, int *unsignedp_ptr)
4589 bool integral_p = INTEGRAL_TYPE_P (TREE_TYPE (op));
4591 while (TREE_CODE (op) == NOP_EXPR)
4594 = (TYPE_PRECISION (TREE_TYPE (op))
4595 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0))));
4597 /* Truncations are many-one so cannot be removed. */
4601 /* See what's inside this conversion. If we decide to strip it,
4606 op = TREE_OPERAND (op, 0);
4607 /* An extension: the outermost one can be stripped,
4608 but remember whether it is zero or sign extension. */
4610 uns = TYPE_UNSIGNED (TREE_TYPE (op));
4611 /* Otherwise, if a sign extension has been stripped,
4612 only sign extensions can now be stripped;
4613 if a zero extension has been stripped, only zero-extensions. */
4614 else if (uns != TYPE_UNSIGNED (TREE_TYPE (op)))
4618 else /* bitschange == 0 */
4620 /* A change in nominal type can always be stripped, but we must
4621 preserve the unsignedness. */
4623 uns = TYPE_UNSIGNED (TREE_TYPE (op));
4625 op = TREE_OPERAND (op, 0);
4626 /* Keep trying to narrow, but don't assign op to win if it
4627 would turn an integral type into something else. */
4628 if (INTEGRAL_TYPE_P (TREE_TYPE (op)) != integral_p)
4635 if (TREE_CODE (op) == COMPONENT_REF
4636 /* Since type_for_size always gives an integer type. */
4637 && TREE_CODE (TREE_TYPE (op)) != REAL_TYPE
4638 /* Ensure field is laid out already. */
4639 && DECL_SIZE (TREE_OPERAND (op, 1)) != 0
4640 && host_integerp (DECL_SIZE (TREE_OPERAND (op, 1)), 1))
4642 unsigned HOST_WIDE_INT innerprec
4643 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op, 1)), 1);
4644 int unsignedp = (DECL_UNSIGNED (TREE_OPERAND (op, 1))
4645 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op, 1))));
4646 tree type = lang_hooks.types.type_for_size (innerprec, unsignedp);
4648 /* We can get this structure field in a narrower type that fits it,
4649 but the resulting extension to its nominal type (a fullword type)
4650 must satisfy the same conditions as for other extensions.
4652 Do this only for fields that are aligned (not bit-fields),
4653 because when bit-field insns will be used there is no
4654 advantage in doing this. */
4656 if (innerprec < TYPE_PRECISION (TREE_TYPE (op))
4657 && ! DECL_BIT_FIELD (TREE_OPERAND (op, 1))
4658 && (first || uns == DECL_UNSIGNED (TREE_OPERAND (op, 1)))
4662 uns = DECL_UNSIGNED (TREE_OPERAND (op, 1));
4663 win = build3 (COMPONENT_REF, type, TREE_OPERAND (op, 0),
4664 TREE_OPERAND (op, 1), NULL_TREE);
4665 TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op);
4666 TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op);
4669 *unsignedp_ptr = uns;
4673 /* Nonzero if integer constant C has a value that is permissible
4674 for type TYPE (an INTEGER_TYPE). */
4677 int_fits_type_p (tree c, tree type)
4679 tree type_low_bound = TYPE_MIN_VALUE (type);
4680 tree type_high_bound = TYPE_MAX_VALUE (type);
4681 int ok_for_low_bound, ok_for_high_bound;
4683 /* Perform some generic filtering first, which may allow making a decision
4684 even if the bounds are not constant. First, negative integers never fit
4685 in unsigned types, */
4686 if ((TYPE_UNSIGNED (type) && tree_int_cst_sgn (c) < 0)
4687 /* Also, unsigned integers with top bit set never fit signed types. */
4688 || (! TYPE_UNSIGNED (type)
4689 && TYPE_UNSIGNED (TREE_TYPE (c)) && tree_int_cst_msb (c)))
4692 /* If at least one bound of the type is a constant integer, we can check
4693 ourselves and maybe make a decision. If no such decision is possible, but
4694 this type is a subtype, try checking against that. Otherwise, use
4695 force_fit_type, which checks against the precision.
4697 Compute the status for each possibly constant bound, and return if we see
4698 one does not match. Use ok_for_xxx_bound for this purpose, assigning -1
4699 for "unknown if constant fits", 0 for "constant known *not* to fit" and 1
4700 for "constant known to fit". */
4702 ok_for_low_bound = -1;
4703 ok_for_high_bound = -1;
4705 /* Check if C >= type_low_bound. */
4706 if (type_low_bound && TREE_CODE (type_low_bound) == INTEGER_CST)
4708 ok_for_low_bound = ! tree_int_cst_lt (c, type_low_bound);
4709 if (! ok_for_low_bound)
4713 /* Check if c <= type_high_bound. */
4714 if (type_high_bound && TREE_CODE (type_high_bound) == INTEGER_CST)
4716 ok_for_high_bound = ! tree_int_cst_lt (type_high_bound, c);
4717 if (! ok_for_high_bound)
4721 /* If the constant fits both bounds, the result is known. */
4722 if (ok_for_low_bound == 1 && ok_for_high_bound == 1)
4725 /* If we haven't been able to decide at this point, there nothing more we
4726 can check ourselves here. Look at the base type if we have one. */
4727 else if (TREE_CODE (type) == INTEGER_TYPE && TREE_TYPE (type) != 0)
4728 return int_fits_type_p (c, TREE_TYPE (type));
4730 /* Or to force_fit_type, if nothing else. */
4734 TREE_TYPE (c) = type;
4735 c = force_fit_type (c, -1, false, false);
4736 return !TREE_OVERFLOW (c);
4740 /* Subprogram of following function. Called by walk_tree.
4742 Return *TP if it is an automatic variable or parameter of the
4743 function passed in as DATA. */
4746 find_var_from_fn (tree *tp, int *walk_subtrees, void *data)
4748 tree fn = (tree) data;
4753 else if (DECL_P (*tp) && lang_hooks.tree_inlining.auto_var_in_fn_p (*tp, fn))
4759 /* Returns true if T is, contains, or refers to a type with variable
4760 size. If FN is nonzero, only return true if a modifier of the type
4761 or position of FN is a variable or parameter inside FN.
4763 This concept is more general than that of C99 'variably modified types':
4764 in C99, a struct type is never variably modified because a VLA may not
4765 appear as a structure member. However, in GNU C code like:
4767 struct S { int i[f()]; };
4769 is valid, and other languages may define similar constructs. */
4772 variably_modified_type_p (tree type, tree fn)
4776 /* Test if T is either variable (if FN is zero) or an expression containing
4777 a variable in FN. */
4778 #define RETURN_TRUE_IF_VAR(T) \
4779 do { tree _t = (T); \
4780 if (_t && _t != error_mark_node && TREE_CODE (_t) != INTEGER_CST \
4781 && (!fn || walk_tree (&_t, find_var_from_fn, fn, NULL))) \
4782 return true; } while (0)
4784 if (type == error_mark_node)
4787 /* If TYPE itself has variable size, it is variably modified.
4789 We do not yet have a representation of the C99 '[*]' syntax.
4790 When a representation is chosen, this function should be modified
4791 to test for that case as well. */
4792 RETURN_TRUE_IF_VAR (TYPE_SIZE (type));
4793 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT(type));
4795 switch (TREE_CODE (type))
4798 case REFERENCE_TYPE:
4802 if (variably_modified_type_p (TREE_TYPE (type), fn))
4808 /* If TYPE is a function type, it is variably modified if any of the
4809 parameters or the return type are variably modified. */
4810 if (variably_modified_type_p (TREE_TYPE (type), fn))
4813 for (t = TYPE_ARG_TYPES (type);
4814 t && t != void_list_node;
4816 if (variably_modified_type_p (TREE_VALUE (t), fn))
4825 /* Scalar types are variably modified if their end points
4827 RETURN_TRUE_IF_VAR (TYPE_MIN_VALUE (type));
4828 RETURN_TRUE_IF_VAR (TYPE_MAX_VALUE (type));
4833 case QUAL_UNION_TYPE:
4834 /* We can't see if any of the field are variably-modified by the
4835 definition we normally use, since that would produce infinite
4836 recursion via pointers. */
4837 /* This is variably modified if some field's type is. */
4838 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
4839 if (TREE_CODE (t) == FIELD_DECL)
4841 RETURN_TRUE_IF_VAR (DECL_FIELD_OFFSET (t));
4842 RETURN_TRUE_IF_VAR (DECL_SIZE (t));
4843 RETURN_TRUE_IF_VAR (DECL_SIZE_UNIT (t));
4845 if (TREE_CODE (type) == QUAL_UNION_TYPE)
4846 RETURN_TRUE_IF_VAR (DECL_QUALIFIER (t));
4854 /* The current language may have other cases to check, but in general,
4855 all other types are not variably modified. */
4856 return lang_hooks.tree_inlining.var_mod_type_p (type, fn);
4858 #undef RETURN_TRUE_IF_VAR
4861 /* Given a DECL or TYPE, return the scope in which it was declared, or
4862 NULL_TREE if there is no containing scope. */
4865 get_containing_scope (tree t)
4867 return (TYPE_P (t) ? TYPE_CONTEXT (t) : DECL_CONTEXT (t));
4870 /* Return the innermost context enclosing DECL that is
4871 a FUNCTION_DECL, or zero if none. */
4874 decl_function_context (tree decl)
4878 if (TREE_CODE (decl) == ERROR_MARK)
4881 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
4882 where we look up the function at runtime. Such functions always take
4883 a first argument of type 'pointer to real context'.
4885 C++ should really be fixed to use DECL_CONTEXT for the real context,
4886 and use something else for the "virtual context". */
4887 else if (TREE_CODE (decl) == FUNCTION_DECL && DECL_VINDEX (decl))
4890 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)))));
4892 context = DECL_CONTEXT (decl);
4894 while (context && TREE_CODE (context) != FUNCTION_DECL)
4896 if (TREE_CODE (context) == BLOCK)
4897 context = BLOCK_SUPERCONTEXT (context);
4899 context = get_containing_scope (context);
4905 /* Return the innermost context enclosing DECL that is
4906 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
4907 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
4910 decl_type_context (tree decl)
4912 tree context = DECL_CONTEXT (decl);
4915 switch (TREE_CODE (context))
4917 case NAMESPACE_DECL:
4918 case TRANSLATION_UNIT_DECL:
4923 case QUAL_UNION_TYPE:
4928 context = DECL_CONTEXT (context);
4932 context = BLOCK_SUPERCONTEXT (context);
4942 /* CALL is a CALL_EXPR. Return the declaration for the function
4943 called, or NULL_TREE if the called function cannot be
4947 get_callee_fndecl (tree call)
4951 /* It's invalid to call this function with anything but a
4953 if (TREE_CODE (call) != CALL_EXPR)
4956 /* The first operand to the CALL is the address of the function
4958 addr = TREE_OPERAND (call, 0);
4962 /* If this is a readonly function pointer, extract its initial value. */
4963 if (DECL_P (addr) && TREE_CODE (addr) != FUNCTION_DECL
4964 && TREE_READONLY (addr) && ! TREE_THIS_VOLATILE (addr)
4965 && DECL_INITIAL (addr))
4966 addr = DECL_INITIAL (addr);
4968 /* If the address is just `&f' for some function `f', then we know
4969 that `f' is being called. */
4970 if (TREE_CODE (addr) == ADDR_EXPR
4971 && TREE_CODE (TREE_OPERAND (addr, 0)) == FUNCTION_DECL)
4972 return TREE_OPERAND (addr, 0);
4974 /* We couldn't figure out what was being called. Maybe the front
4975 end has some idea. */
4976 return lang_hooks.lang_get_callee_fndecl (call);
4979 /* Print debugging information about tree nodes generated during the compile,
4980 and any language-specific information. */
4983 dump_tree_statistics (void)
4985 #ifdef GATHER_STATISTICS
4987 int total_nodes, total_bytes;
4990 fprintf (stderr, "\n??? tree nodes created\n\n");
4991 #ifdef GATHER_STATISTICS
4992 fprintf (stderr, "Kind Nodes Bytes\n");
4993 fprintf (stderr, "---------------------------------------\n");
4994 total_nodes = total_bytes = 0;
4995 for (i = 0; i < (int) all_kinds; i++)
4997 fprintf (stderr, "%-20s %7d %10d\n", tree_node_kind_names[i],
4998 tree_node_counts[i], tree_node_sizes[i]);
4999 total_nodes += tree_node_counts[i];
5000 total_bytes += tree_node_sizes[i];
5002 fprintf (stderr, "---------------------------------------\n");
5003 fprintf (stderr, "%-20s %7d %10d\n", "Total", total_nodes, total_bytes);
5004 fprintf (stderr, "---------------------------------------\n");
5005 ssanames_print_statistics ();
5006 phinodes_print_statistics ();
5008 fprintf (stderr, "(No per-node statistics)\n");
5010 print_type_hash_statistics ();
5011 lang_hooks.print_statistics ();
5014 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
5016 /* Generate a crc32 of a string. */
5019 crc32_string (unsigned chksum, const char *string)
5023 unsigned value = *string << 24;
5026 for (ix = 8; ix--; value <<= 1)
5030 feedback = (value ^ chksum) & 0x80000000 ? 0x04c11db7 : 0;
5039 /* P is a string that will be used in a symbol. Mask out any characters
5040 that are not valid in that context. */
5043 clean_symbol_name (char *p)
5047 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
5050 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
5057 /* Generate a name for a function unique to this translation unit.
5058 TYPE is some string to identify the purpose of this function to the
5059 linker or collect2. */
5062 get_file_function_name_long (const char *type)
5068 if (first_global_object_name)
5069 p = first_global_object_name;
5072 /* We don't have anything that we know to be unique to this translation
5073 unit, so use what we do have and throw in some randomness. */
5075 const char *name = weak_global_object_name;
5076 const char *file = main_input_filename;
5081 file = input_filename;
5083 len = strlen (file);
5084 q = alloca (9 * 2 + len + 1);
5085 memcpy (q, file, len + 1);
5086 clean_symbol_name (q);
5088 sprintf (q + len, "_%08X_%08X", crc32_string (0, name),
5089 crc32_string (0, flag_random_seed));
5094 buf = alloca (sizeof (FILE_FUNCTION_FORMAT) + strlen (p) + strlen (type));
5096 /* Set up the name of the file-level functions we may need.
5097 Use a global object (which is already required to be unique over
5098 the program) rather than the file name (which imposes extra
5100 sprintf (buf, FILE_FUNCTION_FORMAT, type, p);
5102 return get_identifier (buf);
5105 /* If KIND=='I', return a suitable global initializer (constructor) name.
5106 If KIND=='D', return a suitable global clean-up (destructor) name. */
5109 get_file_function_name (int kind)
5116 return get_file_function_name_long (p);
5119 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
5120 The result is placed in BUFFER (which has length BIT_SIZE),
5121 with one bit in each char ('\000' or '\001').
5123 If the constructor is constant, NULL_TREE is returned.
5124 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
5127 get_set_constructor_bits (tree init, char *buffer, int bit_size)
5131 HOST_WIDE_INT domain_min
5132 = tree_low_cst (TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (init))), 0);
5133 tree non_const_bits = NULL_TREE;
5135 for (i = 0; i < bit_size; i++)
5138 for (vals = TREE_OPERAND (init, 1);
5139 vals != NULL_TREE; vals = TREE_CHAIN (vals))
5141 if (!host_integerp (TREE_VALUE (vals), 0)
5142 || (TREE_PURPOSE (vals) != NULL_TREE
5143 && !host_integerp (TREE_PURPOSE (vals), 0)))
5145 = tree_cons (TREE_PURPOSE (vals), TREE_VALUE (vals), non_const_bits);
5146 else if (TREE_PURPOSE (vals) != NULL_TREE)
5148 /* Set a range of bits to ones. */
5149 HOST_WIDE_INT lo_index
5150 = tree_low_cst (TREE_PURPOSE (vals), 0) - domain_min;
5151 HOST_WIDE_INT hi_index
5152 = tree_low_cst (TREE_VALUE (vals), 0) - domain_min;
5154 if (lo_index < 0 || lo_index >= bit_size
5155 || hi_index < 0 || hi_index >= bit_size)
5157 for (; lo_index <= hi_index; lo_index++)
5158 buffer[lo_index] = 1;
5162 /* Set a single bit to one. */
5164 = tree_low_cst (TREE_VALUE (vals), 0) - domain_min;
5165 if (index < 0 || index >= bit_size)
5167 error ("invalid initializer for bit string");
5173 return non_const_bits;
5176 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
5177 The result is placed in BUFFER (which is an array of bytes).
5178 If the constructor is constant, NULL_TREE is returned.
5179 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
5182 get_set_constructor_bytes (tree init, unsigned char *buffer, int wd_size)
5185 int set_word_size = BITS_PER_UNIT;
5186 int bit_size = wd_size * set_word_size;
5188 unsigned char *bytep = buffer;
5189 char *bit_buffer = alloca (bit_size);
5190 tree non_const_bits = get_set_constructor_bits (init, bit_buffer, bit_size);
5192 for (i = 0; i < wd_size; i++)
5195 for (i = 0; i < bit_size; i++)
5199 if (BYTES_BIG_ENDIAN)
5200 *bytep |= (1 << (set_word_size - 1 - bit_pos));
5202 *bytep |= 1 << bit_pos;
5205 if (bit_pos >= set_word_size)
5206 bit_pos = 0, bytep++;
5208 return non_const_bits;
5211 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
5213 /* Complain that the tree code of NODE does not match the expected 0
5214 terminated list of trailing codes. FILE, LINE, and FUNCTION are of
5218 tree_check_failed (const tree node, const char *file,
5219 int line, const char *function, ...)
5223 unsigned length = 0;
5226 va_start (args, function);
5227 while ((code = va_arg (args, int)))
5228 length += 4 + strlen (tree_code_name[code]);
5230 va_start (args, function);
5231 buffer = alloca (length);
5233 while ((code = va_arg (args, int)))
5237 strcpy (buffer + length, " or ");
5240 strcpy (buffer + length, tree_code_name[code]);
5241 length += strlen (tree_code_name[code]);
5245 internal_error ("tree check: expected %s, have %s in %s, at %s:%d",
5246 buffer, tree_code_name[TREE_CODE (node)],
5247 function, trim_filename (file), line);
5250 /* Complain that the tree code of NODE does match the expected 0
5251 terminated list of trailing codes. FILE, LINE, and FUNCTION are of
5255 tree_not_check_failed (const tree node, const char *file,
5256 int line, const char *function, ...)
5260 unsigned length = 0;
5263 va_start (args, function);
5264 while ((code = va_arg (args, int)))
5265 length += 4 + strlen (tree_code_name[code]);
5267 va_start (args, function);
5268 buffer = alloca (length);
5270 while ((code = va_arg (args, int)))
5274 strcpy (buffer + length, " or ");
5277 strcpy (buffer + length, tree_code_name[code]);
5278 length += strlen (tree_code_name[code]);
5282 internal_error ("tree check: expected none of %s, have %s in %s, at %s:%d",
5283 buffer, tree_code_name[TREE_CODE (node)],
5284 function, trim_filename (file), line);
5287 /* Similar to tree_check_failed, except that we check for a class of tree
5288 code, given in CL. */
5291 tree_class_check_failed (const tree node, int cl, const char *file,
5292 int line, const char *function)
5295 ("tree check: expected class '%c', have '%c' (%s) in %s, at %s:%d",
5296 cl, TREE_CODE_CLASS (TREE_CODE (node)),
5297 tree_code_name[TREE_CODE (node)], function, trim_filename (file), line);
5300 /* Similar to above, except that the check is for the bounds of a TREE_VEC's
5301 (dynamically sized) vector. */
5304 tree_vec_elt_check_failed (int idx, int len, const char *file, int line,
5305 const char *function)
5308 ("tree check: accessed elt %d of tree_vec with %d elts in %s, at %s:%d",
5309 idx + 1, len, function, trim_filename (file), line);
5312 /* Similar to above, except that the check is for the bounds of a PHI_NODE's
5313 (dynamically sized) vector. */
5316 phi_node_elt_check_failed (int idx, int len, const char *file, int line,
5317 const char *function)
5320 ("tree check: accessed elt %d of phi_node with %d elts in %s, at %s:%d",
5321 idx + 1, len, function, trim_filename (file), line);
5324 /* Similar to above, except that the check is for the bounds of the operand
5325 vector of an expression node. */
5328 tree_operand_check_failed (int idx, enum tree_code code, const char *file,
5329 int line, const char *function)
5332 ("tree check: accessed operand %d of %s with %d operands in %s, at %s:%d",
5333 idx + 1, tree_code_name[code], TREE_CODE_LENGTH (code),
5334 function, trim_filename (file), line);
5336 #endif /* ENABLE_TREE_CHECKING */
5338 /* Create a new vector type node holding SUBPARTS units of type INNERTYPE,
5339 and mapped to the machine mode MODE. Initialize its fields and build
5340 the information necessary for debugging output. */
5343 make_vector_type (tree innertype, int nunits, enum machine_mode mode)
5345 tree t = make_node (VECTOR_TYPE);
5347 TREE_TYPE (t) = innertype;
5348 TYPE_VECTOR_SUBPARTS (t) = nunits;
5349 TYPE_MODE (t) = mode;
5353 tree index = build_int_cst (NULL_TREE, nunits - 1);
5354 tree array = build_array_type (innertype, build_index_type (index));
5355 tree rt = make_node (RECORD_TYPE);
5357 TYPE_FIELDS (rt) = build_decl (FIELD_DECL, get_identifier ("f"), array);
5358 DECL_CONTEXT (TYPE_FIELDS (rt)) = rt;
5360 TYPE_DEBUG_REPRESENTATION_TYPE (t) = rt;
5361 /* In dwarfout.c, type lookup uses TYPE_UID numbers. We want to output
5362 the representation type, and we want to find that die when looking up
5363 the vector type. This is most easily achieved by making the TYPE_UID
5365 TYPE_UID (rt) = TYPE_UID (t);
5372 make_or_reuse_type (unsigned size, int unsignedp)
5374 if (size == INT_TYPE_SIZE)
5375 return unsignedp ? unsigned_type_node : integer_type_node;
5376 if (size == CHAR_TYPE_SIZE)
5377 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
5378 if (size == SHORT_TYPE_SIZE)
5379 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
5380 if (size == LONG_TYPE_SIZE)
5381 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
5382 if (size == LONG_LONG_TYPE_SIZE)
5383 return (unsignedp ? long_long_unsigned_type_node
5384 : long_long_integer_type_node);
5387 return make_unsigned_type (size);
5389 return make_signed_type (size);
5392 /* Create nodes for all integer types (and error_mark_node) using the sizes
5393 of C datatypes. The caller should call set_sizetype soon after calling
5394 this function to select one of the types as sizetype. */
5397 build_common_tree_nodes (bool signed_char, bool signed_sizetype)
5399 error_mark_node = make_node (ERROR_MARK);
5400 TREE_TYPE (error_mark_node) = error_mark_node;
5402 initialize_sizetypes (signed_sizetype);
5404 /* Define both `signed char' and `unsigned char'. */
5405 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
5406 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
5408 /* Define `char', which is like either `signed char' or `unsigned char'
5409 but not the same as either. */
5412 ? make_signed_type (CHAR_TYPE_SIZE)
5413 : make_unsigned_type (CHAR_TYPE_SIZE));
5415 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
5416 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
5417 integer_type_node = make_signed_type (INT_TYPE_SIZE);
5418 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
5419 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
5420 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
5421 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
5422 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
5424 /* Define a boolean type. This type only represents boolean values but
5425 may be larger than char depending on the value of BOOL_TYPE_SIZE.
5426 Front ends which want to override this size (i.e. Java) can redefine
5427 boolean_type_node before calling build_common_tree_nodes_2. */
5428 boolean_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
5429 TREE_SET_CODE (boolean_type_node, BOOLEAN_TYPE);
5430 TYPE_MAX_VALUE (boolean_type_node) = build_int_cst (boolean_type_node, 1);
5431 TYPE_PRECISION (boolean_type_node) = 1;
5433 /* Fill in the rest of the sized types. Reuse existing type nodes
5435 intQI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (QImode), 0);
5436 intHI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (HImode), 0);
5437 intSI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (SImode), 0);
5438 intDI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (DImode), 0);
5439 intTI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (TImode), 0);
5441 unsigned_intQI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (QImode), 1);
5442 unsigned_intHI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (HImode), 1);
5443 unsigned_intSI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (SImode), 1);
5444 unsigned_intDI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (DImode), 1);
5445 unsigned_intTI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (TImode), 1);
5447 access_public_node = get_identifier ("public");
5448 access_protected_node = get_identifier ("protected");
5449 access_private_node = get_identifier ("private");
5452 /* Call this function after calling build_common_tree_nodes and set_sizetype.
5453 It will create several other common tree nodes. */
5456 build_common_tree_nodes_2 (int short_double)
5458 /* Define these next since types below may used them. */
5459 integer_zero_node = build_int_cst (NULL_TREE, 0);
5460 integer_one_node = build_int_cst (NULL_TREE, 1);
5461 integer_minus_one_node = build_int_cst (NULL_TREE, -1);
5463 size_zero_node = size_int (0);
5464 size_one_node = size_int (1);
5465 bitsize_zero_node = bitsize_int (0);
5466 bitsize_one_node = bitsize_int (1);
5467 bitsize_unit_node = bitsize_int (BITS_PER_UNIT);
5469 boolean_false_node = TYPE_MIN_VALUE (boolean_type_node);
5470 boolean_true_node = TYPE_MAX_VALUE (boolean_type_node);
5472 void_type_node = make_node (VOID_TYPE);
5473 layout_type (void_type_node);
5475 /* We are not going to have real types in C with less than byte alignment,
5476 so we might as well not have any types that claim to have it. */
5477 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
5478 TYPE_USER_ALIGN (void_type_node) = 0;
5480 null_pointer_node = build_int_cst (build_pointer_type (void_type_node), 0);
5481 layout_type (TREE_TYPE (null_pointer_node));
5483 ptr_type_node = build_pointer_type (void_type_node);
5485 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
5486 fileptr_type_node = ptr_type_node;
5488 float_type_node = make_node (REAL_TYPE);
5489 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
5490 layout_type (float_type_node);
5492 double_type_node = make_node (REAL_TYPE);
5494 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
5496 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
5497 layout_type (double_type_node);
5499 long_double_type_node = make_node (REAL_TYPE);
5500 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
5501 layout_type (long_double_type_node);
5503 float_ptr_type_node = build_pointer_type (float_type_node);
5504 double_ptr_type_node = build_pointer_type (double_type_node);
5505 long_double_ptr_type_node = build_pointer_type (long_double_type_node);
5506 integer_ptr_type_node = build_pointer_type (integer_type_node);
5508 complex_integer_type_node = make_node (COMPLEX_TYPE);
5509 TREE_TYPE (complex_integer_type_node) = integer_type_node;
5510 layout_type (complex_integer_type_node);
5512 complex_float_type_node = make_node (COMPLEX_TYPE);
5513 TREE_TYPE (complex_float_type_node) = float_type_node;
5514 layout_type (complex_float_type_node);
5516 complex_double_type_node = make_node (COMPLEX_TYPE);
5517 TREE_TYPE (complex_double_type_node) = double_type_node;
5518 layout_type (complex_double_type_node);
5520 complex_long_double_type_node = make_node (COMPLEX_TYPE);
5521 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
5522 layout_type (complex_long_double_type_node);
5525 tree t = targetm.build_builtin_va_list ();
5527 /* Many back-ends define record types without setting TYPE_NAME.
5528 If we copied the record type here, we'd keep the original
5529 record type without a name. This breaks name mangling. So,
5530 don't copy record types and let c_common_nodes_and_builtins()
5531 declare the type to be __builtin_va_list. */
5532 if (TREE_CODE (t) != RECORD_TYPE)
5533 t = build_variant_type_copy (t);
5535 va_list_type_node = t;
5539 /* HACK. GROSS. This is absolutely disgusting. I wish there was a
5542 If we requested a pointer to a vector, build up the pointers that
5543 we stripped off while looking for the inner type. Similarly for
5544 return values from functions.
5546 The argument TYPE is the top of the chain, and BOTTOM is the
5547 new type which we will point to. */
5550 reconstruct_complex_type (tree type, tree bottom)
5554 if (POINTER_TYPE_P (type))
5556 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
5557 outer = build_pointer_type (inner);
5559 else if (TREE_CODE (type) == ARRAY_TYPE)
5561 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
5562 outer = build_array_type (inner, TYPE_DOMAIN (type));
5564 else if (TREE_CODE (type) == FUNCTION_TYPE)
5566 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
5567 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
5569 else if (TREE_CODE (type) == METHOD_TYPE)
5571 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
5572 outer = build_method_type_directly (TYPE_METHOD_BASETYPE (type),
5574 TYPE_ARG_TYPES (type));
5579 TYPE_READONLY (outer) = TYPE_READONLY (type);
5580 TYPE_VOLATILE (outer) = TYPE_VOLATILE (type);
5585 /* Returns a vector tree node given a mode (integer, vector, or BLKmode) and
5588 build_vector_type_for_mode (tree innertype, enum machine_mode mode)
5592 if (GET_MODE_CLASS (mode) == MODE_VECTOR_INT
5593 || GET_MODE_CLASS (mode) == MODE_VECTOR_FLOAT)
5594 nunits = GET_MODE_NUNITS (mode);
5596 else if (GET_MODE_CLASS (mode) == MODE_INT)
5598 /* Check that there are no leftover bits. */
5599 if (GET_MODE_BITSIZE (mode) % TREE_INT_CST_LOW (TYPE_SIZE (innertype)))
5602 nunits = GET_MODE_BITSIZE (mode)
5603 / TREE_INT_CST_LOW (TYPE_SIZE (innertype));
5608 return make_vector_type (innertype, nunits, mode);
5611 /* Similarly, but takes the inner type and number of units, which must be
5615 build_vector_type (tree innertype, int nunits)
5617 return make_vector_type (innertype, nunits, VOIDmode);
5620 /* Given an initializer INIT, return TRUE if INIT is zero or some
5621 aggregate of zeros. Otherwise return FALSE. */
5623 initializer_zerop (tree init)
5629 switch (TREE_CODE (init))
5632 return integer_zerop (init);
5635 /* ??? Note that this is not correct for C4X float formats. There,
5636 a bit pattern of all zeros is 1.0; 0.0 is encoded with the most
5637 negative exponent. */
5638 return real_zerop (init)
5639 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (init));
5642 return integer_zerop (init)
5643 || (real_zerop (init)
5644 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_REALPART (init)))
5645 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_IMAGPART (init))));
5648 for (elt = TREE_VECTOR_CST_ELTS (init); elt; elt = TREE_CHAIN (elt))
5649 if (!initializer_zerop (TREE_VALUE (elt)))
5654 elt = CONSTRUCTOR_ELTS (init);
5655 if (elt == NULL_TREE)
5658 /* A set is empty only if it has no elements. */
5659 if (TREE_CODE (TREE_TYPE (init)) == SET_TYPE)
5662 for (; elt ; elt = TREE_CHAIN (elt))
5663 if (! initializer_zerop (TREE_VALUE (elt)))
5673 add_var_to_bind_expr (tree bind_expr, tree var)
5675 BIND_EXPR_VARS (bind_expr)
5676 = chainon (BIND_EXPR_VARS (bind_expr), var);
5677 if (BIND_EXPR_BLOCK (bind_expr))
5678 BLOCK_VARS (BIND_EXPR_BLOCK (bind_expr))
5679 = BIND_EXPR_VARS (bind_expr);
5682 /* Build an empty statement. */
5685 build_empty_stmt (void)
5687 return build1 (NOP_EXPR, void_type_node, size_zero_node);
5691 /* Returns true if it is possible to prove that the index of
5692 an array access REF (an ARRAY_REF expression) falls into the
5696 in_array_bounds_p (tree ref)
5698 tree idx = TREE_OPERAND (ref, 1);
5701 if (TREE_CODE (idx) != INTEGER_CST)
5704 min = array_ref_low_bound (ref);
5705 max = array_ref_up_bound (ref);
5708 || TREE_CODE (min) != INTEGER_CST
5709 || TREE_CODE (max) != INTEGER_CST)
5712 if (tree_int_cst_lt (idx, min)
5713 || tree_int_cst_lt (max, idx))
5719 /* Return true if T (assumed to be a DECL) is a global variable. */
5722 is_global_var (tree t)
5724 return (TREE_STATIC (t) || DECL_EXTERNAL (t));
5727 /* Return true if T (assumed to be a DECL) must be assigned a memory
5731 needs_to_live_in_memory (tree t)
5733 return (TREE_ADDRESSABLE (t)
5734 || is_global_var (t)
5735 || (TREE_CODE (t) == RESULT_DECL
5736 && aggregate_value_p (t, current_function_decl)));
5739 /* There are situations in which a language considers record types
5740 compatible which have different field lists. Decide if two fields
5741 are compatible. It is assumed that the parent records are compatible. */
5744 fields_compatible_p (tree f1, tree f2)
5746 if (!operand_equal_p (DECL_FIELD_BIT_OFFSET (f1),
5747 DECL_FIELD_BIT_OFFSET (f2), OEP_ONLY_CONST))
5750 if (!operand_equal_p (DECL_FIELD_OFFSET (f1),
5751 DECL_FIELD_OFFSET (f2), OEP_ONLY_CONST))
5754 if (!lang_hooks.types_compatible_p (TREE_TYPE (f1), TREE_TYPE (f2)))
5760 /* Locate within RECORD a field that is compatible with ORIG_FIELD. */
5763 find_compatible_field (tree record, tree orig_field)
5767 for (f = TYPE_FIELDS (record); f ; f = TREE_CHAIN (f))
5768 if (TREE_CODE (f) == FIELD_DECL
5769 && fields_compatible_p (f, orig_field))
5772 /* ??? Why isn't this on the main fields list? */
5773 f = TYPE_VFIELD (record);
5774 if (f && TREE_CODE (f) == FIELD_DECL
5775 && fields_compatible_p (f, orig_field))
5778 /* ??? We should abort here, but Java appears to do Bad Things
5779 with inherited fields. */
5783 /* Return value of a constant X. */
5786 int_cst_value (tree x)
5788 unsigned bits = TYPE_PRECISION (TREE_TYPE (x));
5789 unsigned HOST_WIDE_INT val = TREE_INT_CST_LOW (x);
5790 bool negative = ((val >> (bits - 1)) & 1) != 0;
5792 if (bits > HOST_BITS_PER_WIDE_INT)
5796 val |= (~(unsigned HOST_WIDE_INT) 0) << (bits - 1) << 1;
5798 val &= ~((~(unsigned HOST_WIDE_INT) 0) << (bits - 1) << 1);
5803 /* Returns the greatest common divisor of A and B, which must be
5807 tree_fold_gcd (tree a, tree b)
5810 tree type = TREE_TYPE (a);
5812 #if defined ENABLE_CHECKING
5813 if (TREE_CODE (a) != INTEGER_CST
5814 || TREE_CODE (b) != INTEGER_CST)
5818 if (integer_zerop (a))
5821 if (integer_zerop (b))
5824 if (tree_int_cst_sgn (a) == -1)
5825 a = fold (build2 (MULT_EXPR, type, a,
5826 convert (type, integer_minus_one_node)));
5828 if (tree_int_cst_sgn (b) == -1)
5829 b = fold (build2 (MULT_EXPR, type, b,
5830 convert (type, integer_minus_one_node)));
5834 a_mod_b = fold (build2 (CEIL_MOD_EXPR, type, a, b));
5836 if (!TREE_INT_CST_LOW (a_mod_b)
5837 && !TREE_INT_CST_HIGH (a_mod_b))
5845 #include "gt-tree.h"