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 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. */
45 #include "langhooks.h"
47 /* obstack.[ch] explicitly declined to prototype this. */
48 extern int _obstack_allocated_p PARAMS ((struct obstack *h, PTR obj));
50 #ifdef GATHER_STATISTICS
51 /* Statistics-gathering stuff. */
71 int tree_node_counts[(int) all_kinds];
72 int tree_node_sizes[(int) all_kinds];
74 static const char * const tree_node_kind_names[] = {
90 #endif /* GATHER_STATISTICS */
92 /* Unique id for next decl created. */
93 static int next_decl_uid;
94 /* Unique id for next type created. */
95 static int next_type_uid = 1;
97 /* Since we cannot rehash a type after it is in the table, we have to
98 keep the hash code. */
100 struct type_hash GTY(())
106 /* Initial size of the hash table (rounded to next prime). */
107 #define TYPE_HASH_INITIAL_SIZE 1000
109 /* Now here is the hash table. When recording a type, it is added to
110 the slot whose index is the hash code. Note that the hash table is
111 used for several kinds of types (function types, array types and
112 array index range types, for now). While all these live in the
113 same table, they are completely independent, and the hash code is
114 computed differently for each of these. */
116 static GTY ((if_marked ("type_hash_marked_p"), param_is (struct type_hash)))
117 htab_t type_hash_table;
119 static void set_type_quals PARAMS ((tree, int));
120 static void append_random_chars PARAMS ((char *));
121 static int type_hash_eq PARAMS ((const void *, const void *));
122 static hashval_t type_hash_hash PARAMS ((const void *));
123 static void print_type_hash_statistics PARAMS((void));
124 static void finish_vector_type PARAMS((tree));
125 static tree make_vector PARAMS ((enum machine_mode, tree, int));
126 static int type_hash_marked_p PARAMS ((const void *));
128 tree global_trees[TI_MAX];
129 tree integer_types[itk_none];
136 /* Initialize the hash table of types. */
137 type_hash_table = htab_create (TYPE_HASH_INITIAL_SIZE, type_hash_hash,
142 /* The name of the object as the assembler will see it (but before any
143 translations made by ASM_OUTPUT_LABELREF). Often this is the same
144 as DECL_NAME. It is an IDENTIFIER_NODE. */
146 decl_assembler_name (decl)
149 if (!DECL_ASSEMBLER_NAME_SET_P (decl))
150 (*lang_hooks.set_decl_assembler_name) (decl);
151 return DECL_CHECK (decl)->decl.assembler_name;
154 /* Compute the number of bytes occupied by 'node'. This routine only
155 looks at TREE_CODE and, if the code is TREE_VEC, TREE_VEC_LENGTH. */
160 enum tree_code code = TREE_CODE (node);
162 switch (TREE_CODE_CLASS (code))
164 case 'd': /* A decl node */
165 return sizeof (struct tree_decl);
167 case 't': /* a type node */
168 return sizeof (struct tree_type);
170 case 'b': /* a lexical block node */
171 return sizeof (struct tree_block);
173 case 'r': /* a reference */
174 case 'e': /* an expression */
175 case 's': /* an expression with side effects */
176 case '<': /* a comparison expression */
177 case '1': /* a unary arithmetic expression */
178 case '2': /* a binary arithmetic expression */
179 return (sizeof (struct tree_exp)
180 + TREE_CODE_LENGTH (code) * sizeof (char *) - sizeof (char *));
182 case 'c': /* a constant */
183 /* We can't use TREE_CODE_LENGTH for INTEGER_CST, since the number of
184 words is machine-dependent due to varying length of HOST_WIDE_INT,
185 which might be wider than a pointer (e.g., long long). Similarly
186 for REAL_CST, since the number of words is machine-dependent due
187 to varying size and alignment of `double'. */
188 if (code == INTEGER_CST)
189 return sizeof (struct tree_int_cst);
190 else if (code == REAL_CST)
191 return sizeof (struct tree_real_cst);
193 return (sizeof (struct tree_common)
194 + TREE_CODE_LENGTH (code) * sizeof (char *));
196 case 'x': /* something random, like an identifier. */
199 length = (sizeof (struct tree_common)
200 + TREE_CODE_LENGTH (code) * sizeof (char *));
201 if (code == TREE_VEC)
202 length += TREE_VEC_LENGTH (node) * sizeof (char *) - sizeof (char *);
211 /* Return a newly allocated node of code CODE.
212 For decl and type nodes, some other fields are initialized.
213 The rest of the node is initialized to zero.
215 Achoo! I got a code in the node. */
222 int type = TREE_CODE_CLASS (code);
224 #ifdef GATHER_STATISTICS
227 struct tree_common ttmp;
229 /* We can't allocate a TREE_VEC without knowing how many elements
231 if (code == TREE_VEC)
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 'b': /* a lexical block */
252 case 's': /* an expression with side effects */
256 case 'r': /* a reference */
260 case 'e': /* an expression */
261 case '<': /* a comparison expression */
262 case '1': /* a unary arithmetic expression */
263 case '2': /* a binary arithmetic expression */
267 case 'c': /* a constant */
271 case 'x': /* something random, like an identifier. */
272 if (code == IDENTIFIER_NODE)
274 else if (code == TREE_VEC)
284 tree_node_counts[(int) kind]++;
285 tree_node_sizes[(int) kind] += length;
288 t = ggc_alloc_tree (length);
290 memset ((PTR) t, 0, length);
292 TREE_SET_CODE (t, code);
297 TREE_SIDE_EFFECTS (t) = 1;
298 TREE_TYPE (t) = void_type_node;
302 if (code != FUNCTION_DECL)
304 DECL_USER_ALIGN (t) = 0;
305 DECL_IN_SYSTEM_HEADER (t) = in_system_header;
306 DECL_SOURCE_LINE (t) = lineno;
307 DECL_SOURCE_FILE (t) =
308 (input_filename) ? input_filename : "<built-in>";
309 DECL_UID (t) = next_decl_uid++;
311 /* We have not yet computed the alias set for this declaration. */
312 DECL_POINTER_ALIAS_SET (t) = -1;
316 TYPE_UID (t) = next_type_uid++;
317 TYPE_ALIGN (t) = char_type_node ? TYPE_ALIGN (char_type_node) : 0;
318 TYPE_USER_ALIGN (t) = 0;
319 TYPE_MAIN_VARIANT (t) = t;
321 /* Default to no attributes for type, but let target change that. */
322 TYPE_ATTRIBUTES (t) = NULL_TREE;
323 (*targetm.set_default_type_attributes) (t);
325 /* We have not yet computed the alias set for this type. */
326 TYPE_ALIAS_SET (t) = -1;
330 TREE_CONSTANT (t) = 1;
340 case PREDECREMENT_EXPR:
341 case PREINCREMENT_EXPR:
342 case POSTDECREMENT_EXPR:
343 case POSTINCREMENT_EXPR:
344 /* All of these have side-effects, no matter what their
346 TREE_SIDE_EFFECTS (t) = 1;
358 /* Return a new node with the same contents as NODE except that its
359 TREE_CHAIN is zero and it has a fresh uid. */
366 enum tree_code code = TREE_CODE (node);
369 length = tree_size (node);
370 t = ggc_alloc_tree (length);
371 memcpy (t, node, length);
374 TREE_ASM_WRITTEN (t) = 0;
376 if (TREE_CODE_CLASS (code) == 'd')
377 DECL_UID (t) = next_decl_uid++;
378 else if (TREE_CODE_CLASS (code) == 't')
380 TYPE_UID (t) = next_type_uid++;
381 /* The following is so that the debug code for
382 the copy is different from the original type.
383 The two statements usually duplicate each other
384 (because they clear fields of the same union),
385 but the optimizer should catch that. */
386 TYPE_SYMTAB_POINTER (t) = 0;
387 TYPE_SYMTAB_ADDRESS (t) = 0;
393 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
394 For example, this can copy a list made of TREE_LIST nodes. */
406 head = prev = copy_node (list);
407 next = TREE_CHAIN (list);
410 TREE_CHAIN (prev) = copy_node (next);
411 prev = TREE_CHAIN (prev);
412 next = TREE_CHAIN (next);
418 /* Return a newly constructed INTEGER_CST node whose constant value
419 is specified by the two ints LOW and HI.
420 The TREE_TYPE is set to `int'.
422 This function should be used via the `build_int_2' macro. */
425 build_int_2_wide (low, hi)
426 unsigned HOST_WIDE_INT low;
429 tree t = make_node (INTEGER_CST);
431 TREE_INT_CST_LOW (t) = low;
432 TREE_INT_CST_HIGH (t) = hi;
433 TREE_TYPE (t) = integer_type_node;
437 /* Return a new VECTOR_CST node whose type is TYPE and whose values
438 are in a list pointed by VALS. */
441 build_vector (type, vals)
444 tree v = make_node (VECTOR_CST);
445 int over1 = 0, over2 = 0;
448 TREE_VECTOR_CST_ELTS (v) = vals;
449 TREE_TYPE (v) = type;
451 /* Iterate through elements and check for overflow. */
452 for (link = vals; link; link = TREE_CHAIN (link))
454 tree value = TREE_VALUE (link);
456 over1 |= TREE_OVERFLOW (value);
457 over2 |= TREE_CONSTANT_OVERFLOW (value);
460 TREE_OVERFLOW (v) = over1;
461 TREE_CONSTANT_OVERFLOW (v) = over2;
466 /* Return a new REAL_CST node whose type is TYPE and value is D. */
477 /* ??? Used to check for overflow here via CHECK_FLOAT_TYPE.
478 Consider doing it via real_convert now. */
480 v = make_node (REAL_CST);
481 dp = ggc_alloc (sizeof (REAL_VALUE_TYPE));
482 memcpy (dp, &d, sizeof (REAL_VALUE_TYPE));
484 TREE_TYPE (v) = type;
485 TREE_REAL_CST_PTR (v) = dp;
486 TREE_OVERFLOW (v) = TREE_CONSTANT_OVERFLOW (v) = overflow;
490 /* Return a new REAL_CST node whose type is TYPE
491 and whose value is the integer value of the INTEGER_CST node I. */
494 real_value_from_int_cst (type, i)
495 tree type ATTRIBUTE_UNUSED, i;
499 /* Clear all bits of the real value type so that we can later do
500 bitwise comparisons to see if two values are the same. */
501 memset ((char *) &d, 0, sizeof d);
503 if (! TREE_UNSIGNED (TREE_TYPE (i)))
504 REAL_VALUE_FROM_INT (d, TREE_INT_CST_LOW (i), TREE_INT_CST_HIGH (i),
507 REAL_VALUE_FROM_UNSIGNED_INT (d, TREE_INT_CST_LOW (i),
508 TREE_INT_CST_HIGH (i), TYPE_MODE (type));
512 /* Given a tree representing an integer constant I, return a tree
513 representing the same value as a floating-point constant of type TYPE. */
516 build_real_from_int_cst (type, i)
521 int overflow = TREE_OVERFLOW (i);
523 v = build_real (type, real_value_from_int_cst (type, i));
525 TREE_OVERFLOW (v) |= overflow;
526 TREE_CONSTANT_OVERFLOW (v) |= overflow;
530 /* Return a newly constructed STRING_CST node whose value is
531 the LEN characters at STR.
532 The TREE_TYPE is not initialized. */
535 build_string (len, str)
539 tree s = make_node (STRING_CST);
541 TREE_STRING_LENGTH (s) = len;
542 TREE_STRING_POINTER (s) = ggc_alloc_string (str, len);
547 /* Return a newly constructed COMPLEX_CST node whose value is
548 specified by the real and imaginary parts REAL and IMAG.
549 Both REAL and IMAG should be constant nodes. TYPE, if specified,
550 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
553 build_complex (type, real, imag)
557 tree t = make_node (COMPLEX_CST);
559 TREE_REALPART (t) = real;
560 TREE_IMAGPART (t) = imag;
561 TREE_TYPE (t) = type ? type : build_complex_type (TREE_TYPE (real));
562 TREE_OVERFLOW (t) = TREE_OVERFLOW (real) | TREE_OVERFLOW (imag);
563 TREE_CONSTANT_OVERFLOW (t)
564 = TREE_CONSTANT_OVERFLOW (real) | TREE_CONSTANT_OVERFLOW (imag);
568 /* Build a newly constructed TREE_VEC node of length LEN. */
575 int length = (len - 1) * sizeof (tree) + sizeof (struct tree_vec);
577 #ifdef GATHER_STATISTICS
578 tree_node_counts[(int) vec_kind]++;
579 tree_node_sizes[(int) vec_kind] += length;
582 t = ggc_alloc_tree (length);
584 memset ((PTR) t, 0, length);
585 TREE_SET_CODE (t, TREE_VEC);
586 TREE_VEC_LENGTH (t) = len;
591 /* Return 1 if EXPR is the integer constant zero or a complex constant
600 return ((TREE_CODE (expr) == INTEGER_CST
601 && ! TREE_CONSTANT_OVERFLOW (expr)
602 && TREE_INT_CST_LOW (expr) == 0
603 && TREE_INT_CST_HIGH (expr) == 0)
604 || (TREE_CODE (expr) == COMPLEX_CST
605 && integer_zerop (TREE_REALPART (expr))
606 && integer_zerop (TREE_IMAGPART (expr))));
609 /* Return 1 if EXPR is the integer constant one or the corresponding
618 return ((TREE_CODE (expr) == INTEGER_CST
619 && ! TREE_CONSTANT_OVERFLOW (expr)
620 && TREE_INT_CST_LOW (expr) == 1
621 && TREE_INT_CST_HIGH (expr) == 0)
622 || (TREE_CODE (expr) == COMPLEX_CST
623 && integer_onep (TREE_REALPART (expr))
624 && integer_zerop (TREE_IMAGPART (expr))));
627 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
628 it contains. Likewise for the corresponding complex constant. */
631 integer_all_onesp (expr)
639 if (TREE_CODE (expr) == COMPLEX_CST
640 && integer_all_onesp (TREE_REALPART (expr))
641 && integer_zerop (TREE_IMAGPART (expr)))
644 else if (TREE_CODE (expr) != INTEGER_CST
645 || TREE_CONSTANT_OVERFLOW (expr))
648 uns = TREE_UNSIGNED (TREE_TYPE (expr));
650 return (TREE_INT_CST_LOW (expr) == ~(unsigned HOST_WIDE_INT) 0
651 && TREE_INT_CST_HIGH (expr) == -1);
653 /* Note that using TYPE_PRECISION here is wrong. We care about the
654 actual bits, not the (arbitrary) range of the type. */
655 prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr)));
656 if (prec >= HOST_BITS_PER_WIDE_INT)
658 HOST_WIDE_INT high_value;
661 shift_amount = prec - HOST_BITS_PER_WIDE_INT;
663 if (shift_amount > HOST_BITS_PER_WIDE_INT)
664 /* Can not handle precisions greater than twice the host int size. */
666 else if (shift_amount == HOST_BITS_PER_WIDE_INT)
667 /* Shifting by the host word size is undefined according to the ANSI
668 standard, so we must handle this as a special case. */
671 high_value = ((HOST_WIDE_INT) 1 << shift_amount) - 1;
673 return (TREE_INT_CST_LOW (expr) == ~(unsigned HOST_WIDE_INT) 0
674 && TREE_INT_CST_HIGH (expr) == high_value);
677 return TREE_INT_CST_LOW (expr) == ((unsigned HOST_WIDE_INT) 1 << prec) - 1;
680 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
688 HOST_WIDE_INT high, low;
692 if (TREE_CODE (expr) == COMPLEX_CST
693 && integer_pow2p (TREE_REALPART (expr))
694 && integer_zerop (TREE_IMAGPART (expr)))
697 if (TREE_CODE (expr) != INTEGER_CST || TREE_CONSTANT_OVERFLOW (expr))
700 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
701 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
702 high = TREE_INT_CST_HIGH (expr);
703 low = TREE_INT_CST_LOW (expr);
705 /* First clear all bits that are beyond the type's precision in case
706 we've been sign extended. */
708 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
710 else if (prec > HOST_BITS_PER_WIDE_INT)
711 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
715 if (prec < HOST_BITS_PER_WIDE_INT)
716 low &= ~((HOST_WIDE_INT) (-1) << prec);
719 if (high == 0 && low == 0)
722 return ((high == 0 && (low & (low - 1)) == 0)
723 || (low == 0 && (high & (high - 1)) == 0));
726 /* Return the power of two represented by a tree node known to be a
734 HOST_WIDE_INT high, low;
738 if (TREE_CODE (expr) == COMPLEX_CST)
739 return tree_log2 (TREE_REALPART (expr));
741 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
742 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
744 high = TREE_INT_CST_HIGH (expr);
745 low = TREE_INT_CST_LOW (expr);
747 /* First clear all bits that are beyond the type's precision in case
748 we've been sign extended. */
750 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
752 else if (prec > HOST_BITS_PER_WIDE_INT)
753 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
757 if (prec < HOST_BITS_PER_WIDE_INT)
758 low &= ~((HOST_WIDE_INT) (-1) << prec);
761 return (high != 0 ? HOST_BITS_PER_WIDE_INT + exact_log2 (high)
765 /* Similar, but return the largest integer Y such that 2 ** Y is less
766 than or equal to EXPR. */
769 tree_floor_log2 (expr)
773 HOST_WIDE_INT high, low;
777 if (TREE_CODE (expr) == COMPLEX_CST)
778 return tree_log2 (TREE_REALPART (expr));
780 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
781 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
783 high = TREE_INT_CST_HIGH (expr);
784 low = TREE_INT_CST_LOW (expr);
786 /* First clear all bits that are beyond the type's precision in case
787 we've been sign extended. Ignore if type's precision hasn't been set
788 since what we are doing is setting it. */
790 if (prec == 2 * HOST_BITS_PER_WIDE_INT || prec == 0)
792 else if (prec > HOST_BITS_PER_WIDE_INT)
793 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
797 if (prec < HOST_BITS_PER_WIDE_INT)
798 low &= ~((HOST_WIDE_INT) (-1) << prec);
801 return (high != 0 ? HOST_BITS_PER_WIDE_INT + floor_log2 (high)
805 /* Return 1 if EXPR is the real constant zero. */
813 return ((TREE_CODE (expr) == REAL_CST
814 && ! TREE_CONSTANT_OVERFLOW (expr)
815 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst0))
816 || (TREE_CODE (expr) == COMPLEX_CST
817 && real_zerop (TREE_REALPART (expr))
818 && real_zerop (TREE_IMAGPART (expr))));
821 /* Return 1 if EXPR is the real constant one in real or complex form. */
829 return ((TREE_CODE (expr) == REAL_CST
830 && ! TREE_CONSTANT_OVERFLOW (expr)
831 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst1))
832 || (TREE_CODE (expr) == COMPLEX_CST
833 && real_onep (TREE_REALPART (expr))
834 && real_zerop (TREE_IMAGPART (expr))));
837 /* Return 1 if EXPR is the real constant two. */
845 return ((TREE_CODE (expr) == REAL_CST
846 && ! TREE_CONSTANT_OVERFLOW (expr)
847 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst2))
848 || (TREE_CODE (expr) == COMPLEX_CST
849 && real_twop (TREE_REALPART (expr))
850 && real_zerop (TREE_IMAGPART (expr))));
853 /* Return 1 if EXPR is the real constant minus one. */
856 real_minus_onep (expr)
861 return ((TREE_CODE (expr) == REAL_CST
862 && ! TREE_CONSTANT_OVERFLOW (expr)
863 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconstm1))
864 || (TREE_CODE (expr) == COMPLEX_CST
865 && real_minus_onep (TREE_REALPART (expr))
866 && real_zerop (TREE_IMAGPART (expr))));
869 /* Nonzero if EXP is a constant or a cast of a constant. */
872 really_constant_p (exp)
875 /* This is not quite the same as STRIP_NOPS. It does more. */
876 while (TREE_CODE (exp) == NOP_EXPR
877 || TREE_CODE (exp) == CONVERT_EXPR
878 || TREE_CODE (exp) == NON_LVALUE_EXPR)
879 exp = TREE_OPERAND (exp, 0);
880 return TREE_CONSTANT (exp);
883 /* Return first list element whose TREE_VALUE is ELEM.
884 Return 0 if ELEM is not in LIST. */
887 value_member (elem, list)
892 if (elem == TREE_VALUE (list))
894 list = TREE_CHAIN (list);
899 /* Return first list element whose TREE_PURPOSE is ELEM.
900 Return 0 if ELEM is not in LIST. */
903 purpose_member (elem, list)
908 if (elem == TREE_PURPOSE (list))
910 list = TREE_CHAIN (list);
915 /* Return first list element whose BINFO_TYPE is ELEM.
916 Return 0 if ELEM is not in LIST. */
919 binfo_member (elem, list)
924 if (elem == BINFO_TYPE (list))
926 list = TREE_CHAIN (list);
931 /* Return nonzero if ELEM is part of the chain CHAIN. */
934 chain_member (elem, chain)
941 chain = TREE_CHAIN (chain);
947 /* Return nonzero if ELEM is equal to TREE_VALUE (CHAIN) for any piece of
948 chain CHAIN. This and the next function are currently unused, but
949 are retained for completeness. */
952 chain_member_value (elem, chain)
957 if (elem == TREE_VALUE (chain))
959 chain = TREE_CHAIN (chain);
965 /* Return nonzero if ELEM is equal to TREE_PURPOSE (CHAIN)
966 for any piece of chain CHAIN. */
969 chain_member_purpose (elem, chain)
974 if (elem == TREE_PURPOSE (chain))
976 chain = TREE_CHAIN (chain);
982 /* Return the length of a chain of nodes chained through TREE_CHAIN.
983 We expect a null pointer to mark the end of the chain.
984 This is the Lisp primitive `length'. */
993 for (tail = t; tail; tail = TREE_CHAIN (tail))
999 /* Returns the number of FIELD_DECLs in TYPE. */
1002 fields_length (type)
1005 tree t = TYPE_FIELDS (type);
1008 for (; t; t = TREE_CHAIN (t))
1009 if (TREE_CODE (t) == FIELD_DECL)
1015 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
1016 by modifying the last node in chain 1 to point to chain 2.
1017 This is the Lisp primitive `nconc'. */
1027 #ifdef ENABLE_TREE_CHECKING
1031 for (t1 = op1; TREE_CHAIN (t1); t1 = TREE_CHAIN (t1))
1033 TREE_CHAIN (t1) = op2;
1034 #ifdef ENABLE_TREE_CHECKING
1035 for (t2 = op2; t2; t2 = TREE_CHAIN (t2))
1037 abort (); /* Circularity created. */
1045 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
1053 while ((next = TREE_CHAIN (chain)))
1058 /* Reverse the order of elements in the chain T,
1059 and return the new head of the chain (old last element). */
1065 tree prev = 0, decl, next;
1066 for (decl = t; decl; decl = next)
1068 next = TREE_CHAIN (decl);
1069 TREE_CHAIN (decl) = prev;
1075 /* Given a chain CHAIN of tree nodes,
1076 construct and return a list of those nodes. */
1082 tree result = NULL_TREE;
1083 tree in_tail = chain;
1084 tree out_tail = NULL_TREE;
1088 tree next = tree_cons (NULL_TREE, in_tail, NULL_TREE);
1090 TREE_CHAIN (out_tail) = next;
1094 in_tail = TREE_CHAIN (in_tail);
1100 /* Return a newly created TREE_LIST node whose
1101 purpose and value fields are PARM and VALUE. */
1104 build_tree_list (parm, value)
1107 tree t = make_node (TREE_LIST);
1108 TREE_PURPOSE (t) = parm;
1109 TREE_VALUE (t) = value;
1113 /* Return a newly created TREE_LIST node whose
1114 purpose and value fields are PARM and VALUE
1115 and whose TREE_CHAIN is CHAIN. */
1118 tree_cons (purpose, value, chain)
1119 tree purpose, value, chain;
1123 node = ggc_alloc_tree (sizeof (struct tree_list));
1125 memset (node, 0, sizeof (struct tree_common));
1127 #ifdef GATHER_STATISTICS
1128 tree_node_counts[(int) x_kind]++;
1129 tree_node_sizes[(int) x_kind] += sizeof (struct tree_list);
1132 TREE_SET_CODE (node, TREE_LIST);
1133 TREE_CHAIN (node) = chain;
1134 TREE_PURPOSE (node) = purpose;
1135 TREE_VALUE (node) = value;
1140 /* Return the size nominally occupied by an object of type TYPE
1141 when it resides in memory. The value is measured in units of bytes,
1142 and its data type is that normally used for type sizes
1143 (which is the first type created by make_signed_type or
1144 make_unsigned_type). */
1147 size_in_bytes (type)
1152 if (type == error_mark_node)
1153 return integer_zero_node;
1155 type = TYPE_MAIN_VARIANT (type);
1156 t = TYPE_SIZE_UNIT (type);
1160 (*lang_hooks.types.incomplete_type_error) (NULL_TREE, type);
1161 return size_zero_node;
1164 if (TREE_CODE (t) == INTEGER_CST)
1165 force_fit_type (t, 0);
1170 /* Return the size of TYPE (in bytes) as a wide integer
1171 or return -1 if the size can vary or is larger than an integer. */
1174 int_size_in_bytes (type)
1179 if (type == error_mark_node)
1182 type = TYPE_MAIN_VARIANT (type);
1183 t = TYPE_SIZE_UNIT (type);
1185 || TREE_CODE (t) != INTEGER_CST
1186 || TREE_OVERFLOW (t)
1187 || TREE_INT_CST_HIGH (t) != 0
1188 /* If the result would appear negative, it's too big to represent. */
1189 || (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0)
1192 return TREE_INT_CST_LOW (t);
1195 /* Return the bit position of FIELD, in bits from the start of the record.
1196 This is a tree of type bitsizetype. */
1199 bit_position (field)
1203 return bit_from_pos (DECL_FIELD_OFFSET (field),
1204 DECL_FIELD_BIT_OFFSET (field));
1207 /* Likewise, but return as an integer. Abort if it cannot be represented
1208 in that way (since it could be a signed value, we don't have the option
1209 of returning -1 like int_size_in_byte can. */
1212 int_bit_position (field)
1215 return tree_low_cst (bit_position (field), 0);
1218 /* Return the byte position of FIELD, in bytes from the start of the record.
1219 This is a tree of type sizetype. */
1222 byte_position (field)
1225 return byte_from_pos (DECL_FIELD_OFFSET (field),
1226 DECL_FIELD_BIT_OFFSET (field));
1229 /* Likewise, but return as an integer. Abort if it cannot be represented
1230 in that way (since it could be a signed value, we don't have the option
1231 of returning -1 like int_size_in_byte can. */
1234 int_byte_position (field)
1237 return tree_low_cst (byte_position (field), 0);
1240 /* Return the strictest alignment, in bits, that T is known to have. */
1246 unsigned int align0, align1;
1248 switch (TREE_CODE (t))
1250 case NOP_EXPR: case CONVERT_EXPR: case NON_LVALUE_EXPR:
1251 /* If we have conversions, we know that the alignment of the
1252 object must meet each of the alignments of the types. */
1253 align0 = expr_align (TREE_OPERAND (t, 0));
1254 align1 = TYPE_ALIGN (TREE_TYPE (t));
1255 return MAX (align0, align1);
1257 case SAVE_EXPR: case COMPOUND_EXPR: case MODIFY_EXPR:
1258 case INIT_EXPR: case TARGET_EXPR: case WITH_CLEANUP_EXPR:
1259 case WITH_RECORD_EXPR: case CLEANUP_POINT_EXPR: case UNSAVE_EXPR:
1260 /* These don't change the alignment of an object. */
1261 return expr_align (TREE_OPERAND (t, 0));
1264 /* The best we can do is say that the alignment is the least aligned
1266 align0 = expr_align (TREE_OPERAND (t, 1));
1267 align1 = expr_align (TREE_OPERAND (t, 2));
1268 return MIN (align0, align1);
1270 case LABEL_DECL: case CONST_DECL:
1271 case VAR_DECL: case PARM_DECL: case RESULT_DECL:
1272 if (DECL_ALIGN (t) != 0)
1273 return DECL_ALIGN (t);
1277 return FUNCTION_BOUNDARY;
1283 /* Otherwise take the alignment from that of the type. */
1284 return TYPE_ALIGN (TREE_TYPE (t));
1287 /* Return, as a tree node, the number of elements for TYPE (which is an
1288 ARRAY_TYPE) minus one. This counts only elements of the top array. */
1291 array_type_nelts (type)
1294 tree index_type, min, max;
1296 /* If they did it with unspecified bounds, then we should have already
1297 given an error about it before we got here. */
1298 if (! TYPE_DOMAIN (type))
1299 return error_mark_node;
1301 index_type = TYPE_DOMAIN (type);
1302 min = TYPE_MIN_VALUE (index_type);
1303 max = TYPE_MAX_VALUE (index_type);
1305 return (integer_zerop (min)
1307 : fold (build (MINUS_EXPR, TREE_TYPE (max), max, min)));
1310 /* Return nonzero if arg is static -- a reference to an object in
1311 static storage. This is not the same as the C meaning of `static'. */
1317 switch (TREE_CODE (arg))
1320 /* Nested functions aren't static, since taking their address
1321 involves a trampoline. */
1322 return ((decl_function_context (arg) == 0 || DECL_NO_STATIC_CHAIN (arg))
1323 && ! DECL_NON_ADDR_CONST_P (arg));
1326 return ((TREE_STATIC (arg) || DECL_EXTERNAL (arg))
1327 && ! DECL_THREAD_LOCAL (arg)
1328 && ! DECL_NON_ADDR_CONST_P (arg));
1331 return TREE_STATIC (arg);
1337 /* If we are referencing a bitfield, we can't evaluate an
1338 ADDR_EXPR at compile time and so it isn't a constant. */
1340 return (! DECL_BIT_FIELD (TREE_OPERAND (arg, 1))
1341 && staticp (TREE_OPERAND (arg, 0)));
1347 /* This case is technically correct, but results in setting
1348 TREE_CONSTANT on ADDR_EXPRs that cannot be evaluated at
1351 return TREE_CONSTANT (TREE_OPERAND (arg, 0));
1355 case ARRAY_RANGE_REF:
1356 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg))) == INTEGER_CST
1357 && TREE_CODE (TREE_OPERAND (arg, 1)) == INTEGER_CST)
1358 return staticp (TREE_OPERAND (arg, 0));
1361 if ((unsigned int) TREE_CODE (arg)
1362 >= (unsigned int) LAST_AND_UNUSED_TREE_CODE)
1363 return (*lang_hooks.staticp) (arg);
1369 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
1370 Do this to any expression which may be used in more than one place,
1371 but must be evaluated only once.
1373 Normally, expand_expr would reevaluate the expression each time.
1374 Calling save_expr produces something that is evaluated and recorded
1375 the first time expand_expr is called on it. Subsequent calls to
1376 expand_expr just reuse the recorded value.
1378 The call to expand_expr that generates code that actually computes
1379 the value is the first call *at compile time*. Subsequent calls
1380 *at compile time* generate code to use the saved value.
1381 This produces correct result provided that *at run time* control
1382 always flows through the insns made by the first expand_expr
1383 before reaching the other places where the save_expr was evaluated.
1384 You, the caller of save_expr, must make sure this is so.
1386 Constants, and certain read-only nodes, are returned with no
1387 SAVE_EXPR because that is safe. Expressions containing placeholders
1388 are not touched; see tree.def for an explanation of what these
1395 tree t = fold (expr);
1398 /* We don't care about whether this can be used as an lvalue in this
1400 while (TREE_CODE (t) == NON_LVALUE_EXPR)
1401 t = TREE_OPERAND (t, 0);
1403 /* If we have simple operations applied to a SAVE_EXPR or to a SAVE_EXPR and
1404 a constant, it will be more efficient to not make another SAVE_EXPR since
1405 it will allow better simplification and GCSE will be able to merge the
1406 computations if they actualy occur. */
1408 (TREE_CODE_CLASS (TREE_CODE (inner)) == '1'
1409 || (TREE_CODE_CLASS (TREE_CODE (inner)) == '2'
1410 && TREE_CONSTANT (TREE_OPERAND (inner, 1))));
1411 inner = TREE_OPERAND (inner, 0))
1414 /* If the tree evaluates to a constant, then we don't want to hide that
1415 fact (i.e. this allows further folding, and direct checks for constants).
1416 However, a read-only object that has side effects cannot be bypassed.
1417 Since it is no problem to reevaluate literals, we just return the
1419 if (TREE_CONSTANT (inner)
1420 || (TREE_READONLY (inner) && ! TREE_SIDE_EFFECTS (inner))
1421 || TREE_CODE (inner) == SAVE_EXPR || TREE_CODE (inner) == ERROR_MARK)
1424 /* If T contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
1425 it means that the size or offset of some field of an object depends on
1426 the value within another field.
1428 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
1429 and some variable since it would then need to be both evaluated once and
1430 evaluated more than once. Front-ends must assure this case cannot
1431 happen by surrounding any such subexpressions in their own SAVE_EXPR
1432 and forcing evaluation at the proper time. */
1433 if (contains_placeholder_p (t))
1436 t = build (SAVE_EXPR, TREE_TYPE (expr), t, current_function_decl, NULL_TREE);
1438 /* This expression might be placed ahead of a jump to ensure that the
1439 value was computed on both sides of the jump. So make sure it isn't
1440 eliminated as dead. */
1441 TREE_SIDE_EFFECTS (t) = 1;
1442 TREE_READONLY (t) = 1;
1446 /* Arrange for an expression to be expanded multiple independent
1447 times. This is useful for cleanup actions, as the backend can
1448 expand them multiple times in different places. */
1456 /* If this is already protected, no sense in protecting it again. */
1457 if (TREE_CODE (expr) == UNSAVE_EXPR)
1460 t = build1 (UNSAVE_EXPR, TREE_TYPE (expr), expr);
1461 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (expr);
1465 /* Returns the index of the first non-tree operand for CODE, or the number
1466 of operands if all are trees. */
1470 enum tree_code code;
1476 case GOTO_SUBROUTINE_EXPR:
1479 case WITH_CLEANUP_EXPR:
1481 case METHOD_CALL_EXPR:
1484 return TREE_CODE_LENGTH (code);
1488 /* Return which tree structure is used by T. */
1490 enum tree_node_structure_enum
1491 tree_node_structure (t)
1494 enum tree_code code = TREE_CODE (t);
1496 switch (TREE_CODE_CLASS (code))
1498 case 'd': return TS_DECL;
1499 case 't': return TS_TYPE;
1500 case 'b': return TS_BLOCK;
1501 case 'r': case '<': case '1': case '2': case 'e': case 's':
1503 default: /* 'c' and 'x' */
1509 case INTEGER_CST: return TS_INT_CST;
1510 case REAL_CST: return TS_REAL_CST;
1511 case COMPLEX_CST: return TS_COMPLEX;
1512 case VECTOR_CST: return TS_VECTOR;
1513 case STRING_CST: return TS_STRING;
1515 case ERROR_MARK: return TS_COMMON;
1516 case IDENTIFIER_NODE: return TS_IDENTIFIER;
1517 case TREE_LIST: return TS_LIST;
1518 case TREE_VEC: return TS_VEC;
1519 case PLACEHOLDER_EXPR: return TS_COMMON;
1526 /* Perform any modifications to EXPR required when it is unsaved. Does
1527 not recurse into EXPR's subtrees. */
1530 unsave_expr_1 (expr)
1533 switch (TREE_CODE (expr))
1536 if (! SAVE_EXPR_PERSISTENT_P (expr))
1537 SAVE_EXPR_RTL (expr) = 0;
1541 /* Don't mess with a TARGET_EXPR that hasn't been expanded.
1542 It's OK for this to happen if it was part of a subtree that
1543 isn't immediately expanded, such as operand 2 of another
1545 if (TREE_OPERAND (expr, 1))
1548 TREE_OPERAND (expr, 1) = TREE_OPERAND (expr, 3);
1549 TREE_OPERAND (expr, 3) = NULL_TREE;
1553 /* I don't yet know how to emit a sequence multiple times. */
1554 if (RTL_EXPR_SEQUENCE (expr) != 0)
1563 /* Default lang hook for "unsave_expr_now". */
1566 lhd_unsave_expr_now (expr)
1569 enum tree_code code;
1571 /* There's nothing to do for NULL_TREE. */
1575 unsave_expr_1 (expr);
1577 code = TREE_CODE (expr);
1578 switch (TREE_CODE_CLASS (code))
1580 case 'c': /* a constant */
1581 case 't': /* a type node */
1582 case 'd': /* A decl node */
1583 case 'b': /* A block node */
1586 case 'x': /* miscellaneous: e.g., identifier, TREE_LIST or ERROR_MARK. */
1587 if (code == TREE_LIST)
1589 lhd_unsave_expr_now (TREE_VALUE (expr));
1590 lhd_unsave_expr_now (TREE_CHAIN (expr));
1594 case 'e': /* an expression */
1595 case 'r': /* a reference */
1596 case 's': /* an expression with side effects */
1597 case '<': /* a comparison expression */
1598 case '2': /* a binary arithmetic expression */
1599 case '1': /* a unary arithmetic expression */
1603 for (i = first_rtl_op (code) - 1; i >= 0; i--)
1604 lhd_unsave_expr_now (TREE_OPERAND (expr, i));
1615 /* Return 0 if it is safe to evaluate EXPR multiple times,
1616 return 1 if it is safe if EXPR is unsaved afterward, or
1617 return 2 if it is completely unsafe.
1619 This assumes that CALL_EXPRs and TARGET_EXPRs are never replicated in
1620 an expression tree, so that it safe to unsave them and the surrounding
1621 context will be correct.
1623 SAVE_EXPRs basically *only* appear replicated in an expression tree,
1624 occasionally across the whole of a function. It is therefore only
1625 safe to unsave a SAVE_EXPR if you know that all occurrences appear
1626 below the UNSAVE_EXPR.
1628 RTL_EXPRs consume their rtl during evaluation. It is therefore
1629 never possible to unsave them. */
1632 unsafe_for_reeval (expr)
1636 enum tree_code code;
1641 if (expr == NULL_TREE)
1644 code = TREE_CODE (expr);
1645 first_rtl = first_rtl_op (code);
1654 for (exp = expr; exp != 0; exp = TREE_CHAIN (exp))
1656 tmp = unsafe_for_reeval (TREE_VALUE (exp));
1657 unsafeness = MAX (tmp, unsafeness);
1663 tmp = unsafe_for_reeval (TREE_OPERAND (expr, 1));
1664 return MAX (tmp, 1);
1671 tmp = (*lang_hooks.unsafe_for_reeval) (expr);
1677 switch (TREE_CODE_CLASS (code))
1679 case 'c': /* a constant */
1680 case 't': /* a type node */
1681 case 'x': /* something random, like an identifier or an ERROR_MARK. */
1682 case 'd': /* A decl node */
1683 case 'b': /* A block node */
1686 case 'e': /* an expression */
1687 case 'r': /* a reference */
1688 case 's': /* an expression with side effects */
1689 case '<': /* a comparison expression */
1690 case '2': /* a binary arithmetic expression */
1691 case '1': /* a unary arithmetic expression */
1692 for (i = first_rtl - 1; i >= 0; i--)
1694 tmp = unsafe_for_reeval (TREE_OPERAND (expr, i));
1695 unsafeness = MAX (tmp, unsafeness);
1705 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
1706 or offset that depends on a field within a record. */
1709 contains_placeholder_p (exp)
1712 enum tree_code code;
1718 /* If we have a WITH_RECORD_EXPR, it "cancels" any PLACEHOLDER_EXPR
1719 in it since it is supplying a value for it. */
1720 code = TREE_CODE (exp);
1721 if (code == WITH_RECORD_EXPR)
1723 else if (code == PLACEHOLDER_EXPR)
1726 switch (TREE_CODE_CLASS (code))
1729 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
1730 position computations since they will be converted into a
1731 WITH_RECORD_EXPR involving the reference, which will assume
1732 here will be valid. */
1733 return contains_placeholder_p (TREE_OPERAND (exp, 0));
1736 if (code == TREE_LIST)
1737 return (contains_placeholder_p (TREE_VALUE (exp))
1738 || (TREE_CHAIN (exp) != 0
1739 && contains_placeholder_p (TREE_CHAIN (exp))));
1748 /* Ignoring the first operand isn't quite right, but works best. */
1749 return contains_placeholder_p (TREE_OPERAND (exp, 1));
1756 return (contains_placeholder_p (TREE_OPERAND (exp, 0))
1757 || contains_placeholder_p (TREE_OPERAND (exp, 1))
1758 || contains_placeholder_p (TREE_OPERAND (exp, 2)));
1761 /* If we already know this doesn't have a placeholder, don't
1763 if (SAVE_EXPR_NOPLACEHOLDER (exp) || SAVE_EXPR_RTL (exp) != 0)
1766 SAVE_EXPR_NOPLACEHOLDER (exp) = 1;
1767 result = contains_placeholder_p (TREE_OPERAND (exp, 0));
1769 SAVE_EXPR_NOPLACEHOLDER (exp) = 0;
1774 return (TREE_OPERAND (exp, 1) != 0
1775 && contains_placeholder_p (TREE_OPERAND (exp, 1)));
1781 switch (TREE_CODE_LENGTH (code))
1784 return contains_placeholder_p (TREE_OPERAND (exp, 0));
1786 return (contains_placeholder_p (TREE_OPERAND (exp, 0))
1787 || contains_placeholder_p (TREE_OPERAND (exp, 1)));
1798 /* Return 1 if EXP contains any expressions that produce cleanups for an
1799 outer scope to deal with. Used by fold. */
1807 if (! TREE_SIDE_EFFECTS (exp))
1810 switch (TREE_CODE (exp))
1813 case GOTO_SUBROUTINE_EXPR:
1814 case WITH_CLEANUP_EXPR:
1817 case CLEANUP_POINT_EXPR:
1821 for (exp = TREE_OPERAND (exp, 1); exp; exp = TREE_CHAIN (exp))
1823 cmp = has_cleanups (TREE_VALUE (exp));
1833 /* This general rule works for most tree codes. All exceptions should be
1834 handled above. If this is a language-specific tree code, we can't
1835 trust what might be in the operand, so say we don't know
1837 if ((int) TREE_CODE (exp) >= (int) LAST_AND_UNUSED_TREE_CODE)
1840 nops = first_rtl_op (TREE_CODE (exp));
1841 for (i = 0; i < nops; i++)
1842 if (TREE_OPERAND (exp, i) != 0)
1844 int type = TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, i)));
1845 if (type == 'e' || type == '<' || type == '1' || type == '2'
1846 || type == 'r' || type == 's')
1848 cmp = has_cleanups (TREE_OPERAND (exp, i));
1857 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
1858 return a tree with all occurrences of references to F in a
1859 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
1860 contains only arithmetic expressions or a CALL_EXPR with a
1861 PLACEHOLDER_EXPR occurring only in its arglist. */
1864 substitute_in_expr (exp, f, r)
1869 enum tree_code code = TREE_CODE (exp);
1874 switch (TREE_CODE_CLASS (code))
1881 if (code == PLACEHOLDER_EXPR)
1883 else if (code == TREE_LIST)
1885 op0 = (TREE_CHAIN (exp) == 0
1886 ? 0 : substitute_in_expr (TREE_CHAIN (exp), f, r));
1887 op1 = substitute_in_expr (TREE_VALUE (exp), f, r);
1888 if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
1891 return tree_cons (TREE_PURPOSE (exp), op1, op0);
1900 switch (TREE_CODE_LENGTH (code))
1903 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
1904 if (op0 == TREE_OPERAND (exp, 0))
1907 if (code == NON_LVALUE_EXPR)
1910 new = fold (build1 (code, TREE_TYPE (exp), op0));
1914 /* An RTL_EXPR cannot contain a PLACEHOLDER_EXPR; a CONSTRUCTOR
1915 could, but we don't support it. */
1916 if (code == RTL_EXPR)
1918 else if (code == CONSTRUCTOR)
1921 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
1922 op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
1923 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
1926 new = fold (build (code, TREE_TYPE (exp), op0, op1));
1930 /* It cannot be that anything inside a SAVE_EXPR contains a
1931 PLACEHOLDER_EXPR. */
1932 if (code == SAVE_EXPR)
1935 else if (code == CALL_EXPR)
1937 op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
1938 if (op1 == TREE_OPERAND (exp, 1))
1941 return build (code, TREE_TYPE (exp),
1942 TREE_OPERAND (exp, 0), op1, NULL_TREE);
1945 else if (code != COND_EXPR)
1948 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
1949 op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
1950 op2 = substitute_in_expr (TREE_OPERAND (exp, 2), f, r);
1951 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
1952 && op2 == TREE_OPERAND (exp, 2))
1955 new = fold (build (code, TREE_TYPE (exp), op0, op1, op2));
1968 /* If this expression is getting a value from a PLACEHOLDER_EXPR
1969 and it is the right field, replace it with R. */
1970 for (inner = TREE_OPERAND (exp, 0);
1971 TREE_CODE_CLASS (TREE_CODE (inner)) == 'r';
1972 inner = TREE_OPERAND (inner, 0))
1974 if (TREE_CODE (inner) == PLACEHOLDER_EXPR
1975 && TREE_OPERAND (exp, 1) == f)
1978 /* If this expression hasn't been completed let, leave it
1980 if (TREE_CODE (inner) == PLACEHOLDER_EXPR
1981 && TREE_TYPE (inner) == 0)
1984 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
1985 if (op0 == TREE_OPERAND (exp, 0))
1988 new = fold (build (code, TREE_TYPE (exp), op0,
1989 TREE_OPERAND (exp, 1)));
1993 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
1994 op1 = substitute_in_expr (TREE_OPERAND (exp, 1), f, r);
1995 op2 = substitute_in_expr (TREE_OPERAND (exp, 2), f, r);
1996 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
1997 && op2 == TREE_OPERAND (exp, 2))
2000 new = fold (build (code, TREE_TYPE (exp), op0, op1, op2));
2005 op0 = substitute_in_expr (TREE_OPERAND (exp, 0), f, r);
2006 if (op0 == TREE_OPERAND (exp, 0))
2009 new = fold (build1 (code, TREE_TYPE (exp), op0));
2021 TREE_READONLY (new) = TREE_READONLY (exp);
2025 /* Stabilize a reference so that we can use it any number of times
2026 without causing its operands to be evaluated more than once.
2027 Returns the stabilized reference. This works by means of save_expr,
2028 so see the caveats in the comments about save_expr.
2030 Also allows conversion expressions whose operands are references.
2031 Any other kind of expression is returned unchanged. */
2034 stabilize_reference (ref)
2038 enum tree_code code = TREE_CODE (ref);
2045 /* No action is needed in this case. */
2051 case FIX_TRUNC_EXPR:
2052 case FIX_FLOOR_EXPR:
2053 case FIX_ROUND_EXPR:
2055 result = build_nt (code, stabilize_reference (TREE_OPERAND (ref, 0)));
2059 result = build_nt (INDIRECT_REF,
2060 stabilize_reference_1 (TREE_OPERAND (ref, 0)));
2064 result = build_nt (COMPONENT_REF,
2065 stabilize_reference (TREE_OPERAND (ref, 0)),
2066 TREE_OPERAND (ref, 1));
2070 result = build_nt (BIT_FIELD_REF,
2071 stabilize_reference (TREE_OPERAND (ref, 0)),
2072 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
2073 stabilize_reference_1 (TREE_OPERAND (ref, 2)));
2077 result = build_nt (ARRAY_REF,
2078 stabilize_reference (TREE_OPERAND (ref, 0)),
2079 stabilize_reference_1 (TREE_OPERAND (ref, 1)));
2082 case ARRAY_RANGE_REF:
2083 result = build_nt (ARRAY_RANGE_REF,
2084 stabilize_reference (TREE_OPERAND (ref, 0)),
2085 stabilize_reference_1 (TREE_OPERAND (ref, 1)));
2089 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2090 it wouldn't be ignored. This matters when dealing with
2092 return stabilize_reference_1 (ref);
2095 result = build1 (INDIRECT_REF, TREE_TYPE (ref),
2096 save_expr (build1 (ADDR_EXPR,
2097 build_pointer_type (TREE_TYPE (ref)),
2101 /* If arg isn't a kind of lvalue we recognize, make no change.
2102 Caller should recognize the error for an invalid lvalue. */
2107 return error_mark_node;
2110 TREE_TYPE (result) = TREE_TYPE (ref);
2111 TREE_READONLY (result) = TREE_READONLY (ref);
2112 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (ref);
2113 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);
2118 /* Subroutine of stabilize_reference; this is called for subtrees of
2119 references. Any expression with side-effects must be put in a SAVE_EXPR
2120 to ensure that it is only evaluated once.
2122 We don't put SAVE_EXPR nodes around everything, because assigning very
2123 simple expressions to temporaries causes us to miss good opportunities
2124 for optimizations. Among other things, the opportunity to fold in the
2125 addition of a constant into an addressing mode often gets lost, e.g.
2126 "y[i+1] += x;". In general, we take the approach that we should not make
2127 an assignment unless we are forced into it - i.e., that any non-side effect
2128 operator should be allowed, and that cse should take care of coalescing
2129 multiple utterances of the same expression should that prove fruitful. */
2132 stabilize_reference_1 (e)
2136 enum tree_code code = TREE_CODE (e);
2138 /* We cannot ignore const expressions because it might be a reference
2139 to a const array but whose index contains side-effects. But we can
2140 ignore things that are actual constant or that already have been
2141 handled by this function. */
2143 if (TREE_CONSTANT (e) || code == SAVE_EXPR)
2146 switch (TREE_CODE_CLASS (code))
2156 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2157 so that it will only be evaluated once. */
2158 /* The reference (r) and comparison (<) classes could be handled as
2159 below, but it is generally faster to only evaluate them once. */
2160 if (TREE_SIDE_EFFECTS (e))
2161 return save_expr (e);
2165 /* Constants need no processing. In fact, we should never reach
2170 /* Division is slow and tends to be compiled with jumps,
2171 especially the division by powers of 2 that is often
2172 found inside of an array reference. So do it just once. */
2173 if (code == TRUNC_DIV_EXPR || code == TRUNC_MOD_EXPR
2174 || code == FLOOR_DIV_EXPR || code == FLOOR_MOD_EXPR
2175 || code == CEIL_DIV_EXPR || code == CEIL_MOD_EXPR
2176 || code == ROUND_DIV_EXPR || code == ROUND_MOD_EXPR)
2177 return save_expr (e);
2178 /* Recursively stabilize each operand. */
2179 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)),
2180 stabilize_reference_1 (TREE_OPERAND (e, 1)));
2184 /* Recursively stabilize each operand. */
2185 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)));
2192 TREE_TYPE (result) = TREE_TYPE (e);
2193 TREE_READONLY (result) = TREE_READONLY (e);
2194 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (e);
2195 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);
2200 /* Low-level constructors for expressions. */
2202 /* Build an expression of code CODE, data type TYPE,
2203 and operands as specified by the arguments ARG1 and following arguments.
2204 Expressions and reference nodes can be created this way.
2205 Constants, decls, types and misc nodes cannot be. */
2208 build VPARAMS ((enum tree_code code, tree tt, ...))
2217 VA_FIXEDARG (p, enum tree_code, code);
2218 VA_FIXEDARG (p, tree, tt);
2220 t = make_node (code);
2221 length = TREE_CODE_LENGTH (code);
2224 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
2225 result based on those same flags for the arguments. But if the
2226 arguments aren't really even `tree' expressions, we shouldn't be trying
2228 fro = first_rtl_op (code);
2230 /* Expressions without side effects may be constant if their
2231 arguments are as well. */
2232 constant = (TREE_CODE_CLASS (code) == '<'
2233 || TREE_CODE_CLASS (code) == '1'
2234 || TREE_CODE_CLASS (code) == '2'
2235 || TREE_CODE_CLASS (code) == 'c');
2239 /* This is equivalent to the loop below, but faster. */
2240 tree arg0 = va_arg (p, tree);
2241 tree arg1 = va_arg (p, tree);
2243 TREE_OPERAND (t, 0) = arg0;
2244 TREE_OPERAND (t, 1) = arg1;
2245 TREE_READONLY (t) = 1;
2246 if (arg0 && fro > 0)
2248 if (TREE_SIDE_EFFECTS (arg0))
2249 TREE_SIDE_EFFECTS (t) = 1;
2250 if (!TREE_READONLY (arg0))
2251 TREE_READONLY (t) = 0;
2252 if (!TREE_CONSTANT (arg0))
2256 if (arg1 && fro > 1)
2258 if (TREE_SIDE_EFFECTS (arg1))
2259 TREE_SIDE_EFFECTS (t) = 1;
2260 if (!TREE_READONLY (arg1))
2261 TREE_READONLY (t) = 0;
2262 if (!TREE_CONSTANT (arg1))
2266 else if (length == 1)
2268 tree arg0 = va_arg (p, tree);
2270 /* The only one-operand cases we handle here are those with side-effects.
2271 Others are handled with build1. So don't bother checked if the
2272 arg has side-effects since we'll already have set it.
2274 ??? This really should use build1 too. */
2275 if (TREE_CODE_CLASS (code) != 's')
2277 TREE_OPERAND (t, 0) = arg0;
2281 for (i = 0; i < length; i++)
2283 tree operand = va_arg (p, tree);
2285 TREE_OPERAND (t, i) = operand;
2286 if (operand && fro > i)
2288 if (TREE_SIDE_EFFECTS (operand))
2289 TREE_SIDE_EFFECTS (t) = 1;
2290 if (!TREE_CONSTANT (operand))
2297 TREE_CONSTANT (t) = constant;
2301 /* Same as above, but only builds for unary operators.
2302 Saves lions share of calls to `build'; cuts down use
2303 of varargs, which is expensive for RISC machines. */
2306 build1 (code, type, node)
2307 enum tree_code code;
2312 #ifdef GATHER_STATISTICS
2313 tree_node_kind kind;
2317 #ifdef GATHER_STATISTICS
2318 if (TREE_CODE_CLASS (code) == 'r')
2324 #ifdef ENABLE_CHECKING
2325 if (TREE_CODE_CLASS (code) == '2'
2326 || TREE_CODE_CLASS (code) == '<'
2327 || TREE_CODE_LENGTH (code) != 1)
2329 #endif /* ENABLE_CHECKING */
2331 length = sizeof (struct tree_exp);
2333 t = ggc_alloc_tree (length);
2335 memset ((PTR) t, 0, sizeof (struct tree_common));
2337 #ifdef GATHER_STATISTICS
2338 tree_node_counts[(int) kind]++;
2339 tree_node_sizes[(int) kind] += length;
2342 TREE_SET_CODE (t, code);
2344 TREE_TYPE (t) = type;
2345 TREE_COMPLEXITY (t) = 0;
2346 TREE_OPERAND (t, 0) = node;
2347 if (node && first_rtl_op (code) != 0)
2349 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (node);
2350 TREE_READONLY (t) = TREE_READONLY (node);
2359 case PREDECREMENT_EXPR:
2360 case PREINCREMENT_EXPR:
2361 case POSTDECREMENT_EXPR:
2362 case POSTINCREMENT_EXPR:
2363 /* All of these have side-effects, no matter what their
2365 TREE_SIDE_EFFECTS (t) = 1;
2366 TREE_READONLY (t) = 0;
2370 /* Whether a dereference is readonly has nothing to do with whether
2371 its operand is readonly. */
2372 TREE_READONLY (t) = 0;
2376 if (TREE_CODE_CLASS (code) == '1' && node && TREE_CONSTANT (node))
2377 TREE_CONSTANT (t) = 1;
2384 /* Similar except don't specify the TREE_TYPE
2385 and leave the TREE_SIDE_EFFECTS as 0.
2386 It is permissible for arguments to be null,
2387 or even garbage if their values do not matter. */
2390 build_nt VPARAMS ((enum tree_code code, ...))
2397 VA_FIXEDARG (p, enum tree_code, code);
2399 t = make_node (code);
2400 length = TREE_CODE_LENGTH (code);
2402 for (i = 0; i < length; i++)
2403 TREE_OPERAND (t, i) = va_arg (p, tree);
2409 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
2410 We do NOT enter this node in any sort of symbol table.
2412 layout_decl is used to set up the decl's storage layout.
2413 Other slots are initialized to 0 or null pointers. */
2416 build_decl (code, name, type)
2417 enum tree_code code;
2422 t = make_node (code);
2424 /* if (type == error_mark_node)
2425 type = integer_type_node; */
2426 /* That is not done, deliberately, so that having error_mark_node
2427 as the type can suppress useless errors in the use of this variable. */
2429 DECL_NAME (t) = name;
2430 TREE_TYPE (t) = type;
2432 if (code == VAR_DECL || code == PARM_DECL || code == RESULT_DECL)
2434 else if (code == FUNCTION_DECL)
2435 DECL_MODE (t) = FUNCTION_MODE;
2440 /* BLOCK nodes are used to represent the structure of binding contours
2441 and declarations, once those contours have been exited and their contents
2442 compiled. This information is used for outputting debugging info. */
2445 build_block (vars, tags, subblocks, supercontext, chain)
2446 tree vars, tags ATTRIBUTE_UNUSED, subblocks, supercontext, chain;
2448 tree block = make_node (BLOCK);
2450 BLOCK_VARS (block) = vars;
2451 BLOCK_SUBBLOCKS (block) = subblocks;
2452 BLOCK_SUPERCONTEXT (block) = supercontext;
2453 BLOCK_CHAIN (block) = chain;
2457 /* EXPR_WITH_FILE_LOCATION are used to keep track of the exact
2458 location where an expression or an identifier were encountered. It
2459 is necessary for languages where the frontend parser will handle
2460 recursively more than one file (Java is one of them). */
2463 build_expr_wfl (node, file, line, col)
2468 static const char *last_file = 0;
2469 static tree last_filenode = NULL_TREE;
2470 tree wfl = make_node (EXPR_WITH_FILE_LOCATION);
2472 EXPR_WFL_NODE (wfl) = node;
2473 EXPR_WFL_SET_LINECOL (wfl, line, col);
2474 if (file != last_file)
2477 last_filenode = file ? get_identifier (file) : NULL_TREE;
2480 EXPR_WFL_FILENAME_NODE (wfl) = last_filenode;
2483 TREE_SIDE_EFFECTS (wfl) = TREE_SIDE_EFFECTS (node);
2484 TREE_TYPE (wfl) = TREE_TYPE (node);
2490 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
2494 build_decl_attribute_variant (ddecl, attribute)
2495 tree ddecl, attribute;
2497 DECL_ATTRIBUTES (ddecl) = attribute;
2501 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
2504 Record such modified types already made so we don't make duplicates. */
2507 build_type_attribute_variant (ttype, attribute)
2508 tree ttype, attribute;
2510 if (! attribute_list_equal (TYPE_ATTRIBUTES (ttype), attribute))
2512 unsigned int hashcode;
2515 ntype = copy_node (ttype);
2517 TYPE_POINTER_TO (ntype) = 0;
2518 TYPE_REFERENCE_TO (ntype) = 0;
2519 TYPE_ATTRIBUTES (ntype) = attribute;
2521 /* Create a new main variant of TYPE. */
2522 TYPE_MAIN_VARIANT (ntype) = ntype;
2523 TYPE_NEXT_VARIANT (ntype) = 0;
2524 set_type_quals (ntype, TYPE_UNQUALIFIED);
2526 hashcode = (TYPE_HASH (TREE_CODE (ntype))
2527 + TYPE_HASH (TREE_TYPE (ntype))
2528 + attribute_hash_list (attribute));
2530 switch (TREE_CODE (ntype))
2533 hashcode += TYPE_HASH (TYPE_ARG_TYPES (ntype));
2536 hashcode += TYPE_HASH (TYPE_DOMAIN (ntype));
2539 hashcode += TYPE_HASH (TYPE_MAX_VALUE (ntype));
2542 hashcode += TYPE_HASH (TYPE_PRECISION (ntype));
2548 ntype = type_hash_canon (hashcode, ntype);
2549 ttype = build_qualified_type (ntype, TYPE_QUALS (ttype));
2555 /* Return nonzero if IDENT is a valid name for attribute ATTR,
2558 We try both `text' and `__text__', ATTR may be either one. */
2559 /* ??? It might be a reasonable simplification to require ATTR to be only
2560 `text'. One might then also require attribute lists to be stored in
2561 their canonicalized form. */
2564 is_attribute_p (attr, ident)
2568 int ident_len, attr_len;
2571 if (TREE_CODE (ident) != IDENTIFIER_NODE)
2574 if (strcmp (attr, IDENTIFIER_POINTER (ident)) == 0)
2577 p = IDENTIFIER_POINTER (ident);
2578 ident_len = strlen (p);
2579 attr_len = strlen (attr);
2581 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
2585 || attr[attr_len - 2] != '_'
2586 || attr[attr_len - 1] != '_')
2588 if (ident_len == attr_len - 4
2589 && strncmp (attr + 2, p, attr_len - 4) == 0)
2594 if (ident_len == attr_len + 4
2595 && p[0] == '_' && p[1] == '_'
2596 && p[ident_len - 2] == '_' && p[ident_len - 1] == '_'
2597 && strncmp (attr, p + 2, attr_len) == 0)
2604 /* Given an attribute name and a list of attributes, return a pointer to the
2605 attribute's list element if the attribute is part of the list, or NULL_TREE
2606 if not found. If the attribute appears more than once, this only
2607 returns the first occurrence; the TREE_CHAIN of the return value should
2608 be passed back in if further occurrences are wanted. */
2611 lookup_attribute (attr_name, list)
2612 const char *attr_name;
2617 for (l = list; l; l = TREE_CHAIN (l))
2619 if (TREE_CODE (TREE_PURPOSE (l)) != IDENTIFIER_NODE)
2621 if (is_attribute_p (attr_name, TREE_PURPOSE (l)))
2628 /* Return an attribute list that is the union of a1 and a2. */
2631 merge_attributes (a1, a2)
2636 /* Either one unset? Take the set one. */
2638 if ((attributes = a1) == 0)
2641 /* One that completely contains the other? Take it. */
2643 else if (a2 != 0 && ! attribute_list_contained (a1, a2))
2645 if (attribute_list_contained (a2, a1))
2649 /* Pick the longest list, and hang on the other list. */
2651 if (list_length (a1) < list_length (a2))
2652 attributes = a2, a2 = a1;
2654 for (; a2 != 0; a2 = TREE_CHAIN (a2))
2657 for (a = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)),
2660 a = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)),
2663 if (simple_cst_equal (TREE_VALUE (a), TREE_VALUE (a2)) == 1)
2668 a1 = copy_node (a2);
2669 TREE_CHAIN (a1) = attributes;
2678 /* Given types T1 and T2, merge their attributes and return
2682 merge_type_attributes (t1, t2)
2685 return merge_attributes (TYPE_ATTRIBUTES (t1),
2686 TYPE_ATTRIBUTES (t2));
2689 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
2693 merge_decl_attributes (olddecl, newdecl)
2694 tree olddecl, newdecl;
2696 return merge_attributes (DECL_ATTRIBUTES (olddecl),
2697 DECL_ATTRIBUTES (newdecl));
2700 #ifdef TARGET_DLLIMPORT_DECL_ATTRIBUTES
2702 /* Specialization of merge_decl_attributes for various Windows targets.
2704 This handles the following situation:
2706 __declspec (dllimport) int foo;
2709 The second instance of `foo' nullifies the dllimport. */
2712 merge_dllimport_decl_attributes (old, new)
2717 int delete_dllimport_p;
2719 old = DECL_ATTRIBUTES (old);
2720 new = DECL_ATTRIBUTES (new);
2722 /* What we need to do here is remove from `old' dllimport if it doesn't
2723 appear in `new'. dllimport behaves like extern: if a declaration is
2724 marked dllimport and a definition appears later, then the object
2725 is not dllimport'd. */
2726 if (lookup_attribute ("dllimport", old) != NULL_TREE
2727 && lookup_attribute ("dllimport", new) == NULL_TREE)
2728 delete_dllimport_p = 1;
2730 delete_dllimport_p = 0;
2732 a = merge_attributes (old, new);
2734 if (delete_dllimport_p)
2738 /* Scan the list for dllimport and delete it. */
2739 for (prev = NULL_TREE, t = a; t; prev = t, t = TREE_CHAIN (t))
2741 if (is_attribute_p ("dllimport", TREE_PURPOSE (t)))
2743 if (prev == NULL_TREE)
2746 TREE_CHAIN (prev) = TREE_CHAIN (t);
2755 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
2757 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
2758 of the various TYPE_QUAL values. */
2761 set_type_quals (type, type_quals)
2765 TYPE_READONLY (type) = (type_quals & TYPE_QUAL_CONST) != 0;
2766 TYPE_VOLATILE (type) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
2767 TYPE_RESTRICT (type) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
2770 /* Return a version of the TYPE, qualified as indicated by the
2771 TYPE_QUALS, if one exists. If no qualified version exists yet,
2772 return NULL_TREE. */
2775 get_qualified_type (type, type_quals)
2781 /* Search the chain of variants to see if there is already one there just
2782 like the one we need to have. If so, use that existing one. We must
2783 preserve the TYPE_NAME, since there is code that depends on this. */
2784 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
2785 if (TYPE_QUALS (t) == type_quals && TYPE_NAME (t) == TYPE_NAME (type)
2786 && TYPE_CONTEXT (t) == TYPE_CONTEXT (type))
2792 /* Like get_qualified_type, but creates the type if it does not
2793 exist. This function never returns NULL_TREE. */
2796 build_qualified_type (type, type_quals)
2802 /* See if we already have the appropriate qualified variant. */
2803 t = get_qualified_type (type, type_quals);
2805 /* If not, build it. */
2808 t = build_type_copy (type);
2809 set_type_quals (t, type_quals);
2815 /* Create a new variant of TYPE, equivalent but distinct.
2816 This is so the caller can modify it. */
2819 build_type_copy (type)
2822 tree t, m = TYPE_MAIN_VARIANT (type);
2824 t = copy_node (type);
2826 TYPE_POINTER_TO (t) = 0;
2827 TYPE_REFERENCE_TO (t) = 0;
2829 /* Add this type to the chain of variants of TYPE. */
2830 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (m);
2831 TYPE_NEXT_VARIANT (m) = t;
2836 /* Hashing of types so that we don't make duplicates.
2837 The entry point is `type_hash_canon'. */
2839 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
2840 with types in the TREE_VALUE slots), by adding the hash codes
2841 of the individual types. */
2844 type_hash_list (list)
2847 unsigned int hashcode;
2850 for (hashcode = 0, tail = list; tail; tail = TREE_CHAIN (tail))
2851 hashcode += TYPE_HASH (TREE_VALUE (tail));
2856 /* These are the Hashtable callback functions. */
2858 /* Returns true if the types are equal. */
2861 type_hash_eq (va, vb)
2865 const struct type_hash *a = va, *b = vb;
2866 if (a->hash == b->hash
2867 && TREE_CODE (a->type) == TREE_CODE (b->type)
2868 && TREE_TYPE (a->type) == TREE_TYPE (b->type)
2869 && attribute_list_equal (TYPE_ATTRIBUTES (a->type),
2870 TYPE_ATTRIBUTES (b->type))
2871 && TYPE_ALIGN (a->type) == TYPE_ALIGN (b->type)
2872 && (TYPE_MAX_VALUE (a->type) == TYPE_MAX_VALUE (b->type)
2873 || tree_int_cst_equal (TYPE_MAX_VALUE (a->type),
2874 TYPE_MAX_VALUE (b->type)))
2875 && (TYPE_MIN_VALUE (a->type) == TYPE_MIN_VALUE (b->type)
2876 || tree_int_cst_equal (TYPE_MIN_VALUE (a->type),
2877 TYPE_MIN_VALUE (b->type)))
2878 /* Note that TYPE_DOMAIN is TYPE_ARG_TYPES for FUNCTION_TYPE. */
2879 && (TYPE_DOMAIN (a->type) == TYPE_DOMAIN (b->type)
2880 || (TYPE_DOMAIN (a->type)
2881 && TREE_CODE (TYPE_DOMAIN (a->type)) == TREE_LIST
2882 && TYPE_DOMAIN (b->type)
2883 && TREE_CODE (TYPE_DOMAIN (b->type)) == TREE_LIST
2884 && type_list_equal (TYPE_DOMAIN (a->type),
2885 TYPE_DOMAIN (b->type)))))
2890 /* Return the cached hash value. */
2893 type_hash_hash (item)
2896 return ((const struct type_hash *) item)->hash;
2899 /* Look in the type hash table for a type isomorphic to TYPE.
2900 If one is found, return it. Otherwise return 0. */
2903 type_hash_lookup (hashcode, type)
2904 unsigned int hashcode;
2907 struct type_hash *h, in;
2909 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
2910 must call that routine before comparing TYPE_ALIGNs. */
2916 h = htab_find_with_hash (type_hash_table, &in, hashcode);
2922 /* Add an entry to the type-hash-table
2923 for a type TYPE whose hash code is HASHCODE. */
2926 type_hash_add (hashcode, type)
2927 unsigned int hashcode;
2930 struct type_hash *h;
2933 h = (struct type_hash *) ggc_alloc (sizeof (struct type_hash));
2936 loc = htab_find_slot_with_hash (type_hash_table, h, hashcode, INSERT);
2937 *(struct type_hash **) loc = h;
2940 /* Given TYPE, and HASHCODE its hash code, return the canonical
2941 object for an identical type if one already exists.
2942 Otherwise, return TYPE, and record it as the canonical object
2943 if it is a permanent object.
2945 To use this function, first create a type of the sort you want.
2946 Then compute its hash code from the fields of the type that
2947 make it different from other similar types.
2948 Then call this function and use the value.
2949 This function frees the type you pass in if it is a duplicate. */
2951 /* Set to 1 to debug without canonicalization. Never set by program. */
2952 int debug_no_type_hash = 0;
2955 type_hash_canon (hashcode, type)
2956 unsigned int hashcode;
2961 if (debug_no_type_hash)
2964 /* See if the type is in the hash table already. If so, return it.
2965 Otherwise, add the type. */
2966 t1 = type_hash_lookup (hashcode, type);
2969 #ifdef GATHER_STATISTICS
2970 tree_node_counts[(int) t_kind]--;
2971 tree_node_sizes[(int) t_kind] -= sizeof (struct tree_type);
2977 type_hash_add (hashcode, type);
2982 /* See if the data pointed to by the type hash table is marked. We consider
2983 it marked if the type is marked or if a debug type number or symbol
2984 table entry has been made for the type. This reduces the amount of
2985 debugging output and eliminates that dependency of the debug output on
2986 the number of garbage collections. */
2989 type_hash_marked_p (p)
2992 tree type = ((struct type_hash *) p)->type;
2994 return ggc_marked_p (type) || TYPE_SYMTAB_POINTER (type);
2998 print_type_hash_statistics ()
3000 fprintf (stderr, "Type hash: size %ld, %ld elements, %f collisions\n",
3001 (long) htab_size (type_hash_table),
3002 (long) htab_elements (type_hash_table),
3003 htab_collisions (type_hash_table));
3006 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
3007 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
3008 by adding the hash codes of the individual attributes. */
3011 attribute_hash_list (list)
3014 unsigned int hashcode;
3017 for (hashcode = 0, tail = list; tail; tail = TREE_CHAIN (tail))
3018 /* ??? Do we want to add in TREE_VALUE too? */
3019 hashcode += TYPE_HASH (TREE_PURPOSE (tail));
3023 /* Given two lists of attributes, return true if list l2 is
3024 equivalent to l1. */
3027 attribute_list_equal (l1, l2)
3030 return attribute_list_contained (l1, l2)
3031 && attribute_list_contained (l2, l1);
3034 /* Given two lists of attributes, return true if list L2 is
3035 completely contained within L1. */
3036 /* ??? This would be faster if attribute names were stored in a canonicalized
3037 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
3038 must be used to show these elements are equivalent (which they are). */
3039 /* ??? It's not clear that attributes with arguments will always be handled
3043 attribute_list_contained (l1, l2)
3048 /* First check the obvious, maybe the lists are identical. */
3052 /* Maybe the lists are similar. */
3053 for (t1 = l1, t2 = l2;
3055 && TREE_PURPOSE (t1) == TREE_PURPOSE (t2)
3056 && TREE_VALUE (t1) == TREE_VALUE (t2);
3057 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2));
3059 /* Maybe the lists are equal. */
3060 if (t1 == 0 && t2 == 0)
3063 for (; t2 != 0; t2 = TREE_CHAIN (t2))
3066 for (attr = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)), l1);
3068 attr = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)),
3071 if (simple_cst_equal (TREE_VALUE (t2), TREE_VALUE (attr)) == 1)
3078 if (simple_cst_equal (TREE_VALUE (t2), TREE_VALUE (attr)) != 1)
3085 /* Given two lists of types
3086 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
3087 return 1 if the lists contain the same types in the same order.
3088 Also, the TREE_PURPOSEs must match. */
3091 type_list_equal (l1, l2)
3096 for (t1 = l1, t2 = l2; t1 && t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
3097 if (TREE_VALUE (t1) != TREE_VALUE (t2)
3098 || (TREE_PURPOSE (t1) != TREE_PURPOSE (t2)
3099 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2))
3100 && (TREE_TYPE (TREE_PURPOSE (t1))
3101 == TREE_TYPE (TREE_PURPOSE (t2))))))
3107 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
3108 given by TYPE. If the argument list accepts variable arguments,
3109 then this function counts only the ordinary arguments. */
3112 type_num_arguments (type)
3118 for (t = TYPE_ARG_TYPES (type); t; t = TREE_CHAIN (t))
3119 /* If the function does not take a variable number of arguments,
3120 the last element in the list will have type `void'. */
3121 if (VOID_TYPE_P (TREE_VALUE (t)))
3129 /* Nonzero if integer constants T1 and T2
3130 represent the same constant value. */
3133 tree_int_cst_equal (t1, t2)
3139 if (t1 == 0 || t2 == 0)
3142 if (TREE_CODE (t1) == INTEGER_CST
3143 && TREE_CODE (t2) == INTEGER_CST
3144 && TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
3145 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2))
3151 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
3152 The precise way of comparison depends on their data type. */
3155 tree_int_cst_lt (t1, t2)
3161 if (TREE_UNSIGNED (TREE_TYPE (t1)) != TREE_UNSIGNED (TREE_TYPE (t2)))
3163 int t1_sgn = tree_int_cst_sgn (t1);
3164 int t2_sgn = tree_int_cst_sgn (t2);
3166 if (t1_sgn < t2_sgn)
3168 else if (t1_sgn > t2_sgn)
3170 /* Otherwise, both are non-negative, so we compare them as
3171 unsigned just in case one of them would overflow a signed
3174 else if (! TREE_UNSIGNED (TREE_TYPE (t1)))
3175 return INT_CST_LT (t1, t2);
3177 return INT_CST_LT_UNSIGNED (t1, t2);
3180 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
3183 tree_int_cst_compare (t1, t2)
3187 if (tree_int_cst_lt (t1, t2))
3189 else if (tree_int_cst_lt (t2, t1))
3195 /* Return 1 if T is an INTEGER_CST that can be manipulated efficiently on
3196 the host. If POS is zero, the value can be represented in a single
3197 HOST_WIDE_INT. If POS is nonzero, the value must be positive and can
3198 be represented in a single unsigned HOST_WIDE_INT. */
3201 host_integerp (t, pos)
3205 return (TREE_CODE (t) == INTEGER_CST
3206 && ! TREE_OVERFLOW (t)
3207 && ((TREE_INT_CST_HIGH (t) == 0
3208 && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) >= 0)
3209 || (! pos && TREE_INT_CST_HIGH (t) == -1
3210 && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0
3211 && ! TREE_UNSIGNED (TREE_TYPE (t)))
3212 || (pos && TREE_INT_CST_HIGH (t) == 0)));
3215 /* Return the HOST_WIDE_INT least significant bits of T if it is an
3216 INTEGER_CST and there is no overflow. POS is nonzero if the result must
3217 be positive. Abort if we cannot satisfy the above conditions. */
3220 tree_low_cst (t, pos)
3224 if (host_integerp (t, pos))
3225 return TREE_INT_CST_LOW (t);
3230 /* Return the most significant bit of the integer constant T. */
3233 tree_int_cst_msb (t)
3238 unsigned HOST_WIDE_INT l;
3240 /* Note that using TYPE_PRECISION here is wrong. We care about the
3241 actual bits, not the (arbitrary) range of the type. */
3242 prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t))) - 1;
3243 rshift_double (TREE_INT_CST_LOW (t), TREE_INT_CST_HIGH (t), prec,
3244 2 * HOST_BITS_PER_WIDE_INT, &l, &h, 0);
3245 return (l & 1) == 1;
3248 /* Return an indication of the sign of the integer constant T.
3249 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
3250 Note that -1 will never be returned it T's type is unsigned. */
3253 tree_int_cst_sgn (t)
3256 if (TREE_INT_CST_LOW (t) == 0 && TREE_INT_CST_HIGH (t) == 0)
3258 else if (TREE_UNSIGNED (TREE_TYPE (t)))
3260 else if (TREE_INT_CST_HIGH (t) < 0)
3266 /* Compare two constructor-element-type constants. Return 1 if the lists
3267 are known to be equal; otherwise return 0. */
3270 simple_cst_list_equal (l1, l2)
3273 while (l1 != NULL_TREE && l2 != NULL_TREE)
3275 if (simple_cst_equal (TREE_VALUE (l1), TREE_VALUE (l2)) != 1)
3278 l1 = TREE_CHAIN (l1);
3279 l2 = TREE_CHAIN (l2);
3285 /* Return truthvalue of whether T1 is the same tree structure as T2.
3286 Return 1 if they are the same.
3287 Return 0 if they are understandably different.
3288 Return -1 if either contains tree structure not understood by
3292 simple_cst_equal (t1, t2)
3295 enum tree_code code1, code2;
3301 if (t1 == 0 || t2 == 0)
3304 code1 = TREE_CODE (t1);
3305 code2 = TREE_CODE (t2);
3307 if (code1 == NOP_EXPR || code1 == CONVERT_EXPR || code1 == NON_LVALUE_EXPR)
3309 if (code2 == NOP_EXPR || code2 == CONVERT_EXPR
3310 || code2 == NON_LVALUE_EXPR)
3311 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3313 return simple_cst_equal (TREE_OPERAND (t1, 0), t2);
3316 else if (code2 == NOP_EXPR || code2 == CONVERT_EXPR
3317 || code2 == NON_LVALUE_EXPR)
3318 return simple_cst_equal (t1, TREE_OPERAND (t2, 0));
3326 return (TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
3327 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2));
3330 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
3333 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
3334 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
3335 TREE_STRING_LENGTH (t1)));
3338 if (CONSTRUCTOR_ELTS (t1) == CONSTRUCTOR_ELTS (t2))
3344 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3347 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3351 simple_cst_list_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
3354 /* Special case: if either target is an unallocated VAR_DECL,
3355 it means that it's going to be unified with whatever the
3356 TARGET_EXPR is really supposed to initialize, so treat it
3357 as being equivalent to anything. */
3358 if ((TREE_CODE (TREE_OPERAND (t1, 0)) == VAR_DECL
3359 && DECL_NAME (TREE_OPERAND (t1, 0)) == NULL_TREE
3360 && !DECL_RTL_SET_P (TREE_OPERAND (t1, 0)))
3361 || (TREE_CODE (TREE_OPERAND (t2, 0)) == VAR_DECL
3362 && DECL_NAME (TREE_OPERAND (t2, 0)) == NULL_TREE
3363 && !DECL_RTL_SET_P (TREE_OPERAND (t2, 0))))
3366 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3371 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
3373 case WITH_CLEANUP_EXPR:
3374 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3378 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t1, 1));
3381 if (TREE_OPERAND (t1, 1) == TREE_OPERAND (t2, 1))
3382 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3396 /* This general rule works for most tree codes. All exceptions should be
3397 handled above. If this is a language-specific tree code, we can't
3398 trust what might be in the operand, so say we don't know
3400 if ((int) code1 >= (int) LAST_AND_UNUSED_TREE_CODE)
3403 switch (TREE_CODE_CLASS (code1))
3412 for (i = 0; i < TREE_CODE_LENGTH (code1); i++)
3414 cmp = simple_cst_equal (TREE_OPERAND (t1, i), TREE_OPERAND (t2, i));
3426 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
3427 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
3428 than U, respectively. */
3431 compare_tree_int (t, u)
3433 unsigned HOST_WIDE_INT u;
3435 if (tree_int_cst_sgn (t) < 0)
3437 else if (TREE_INT_CST_HIGH (t) != 0)
3439 else if (TREE_INT_CST_LOW (t) == u)
3441 else if (TREE_INT_CST_LOW (t) < u)
3447 /* Constructors for pointer, array and function types.
3448 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
3449 constructed by language-dependent code, not here.) */
3451 /* Construct, lay out and return the type of pointers to TO_TYPE.
3452 If such a type has already been constructed, reuse it. */
3455 build_pointer_type (to_type)
3458 tree t = TYPE_POINTER_TO (to_type);
3460 /* First, if we already have a type for pointers to TO_TYPE, use it. */
3465 /* We need a new one. */
3466 t = make_node (POINTER_TYPE);
3468 TREE_TYPE (t) = to_type;
3470 /* Record this type as the pointer to TO_TYPE. */
3471 TYPE_POINTER_TO (to_type) = t;
3473 /* Lay out the type. This function has many callers that are concerned
3474 with expression-construction, and this simplifies them all.
3475 Also, it guarantees the TYPE_SIZE is in the same obstack as the type. */
3481 /* Build the node for the type of references-to-TO_TYPE. */
3484 build_reference_type (to_type)
3487 tree t = TYPE_REFERENCE_TO (to_type);
3489 /* First, if we already have a type for pointers to TO_TYPE, use it. */
3494 /* We need a new one. */
3495 t = make_node (REFERENCE_TYPE);
3497 TREE_TYPE (t) = to_type;
3499 /* Record this type as the pointer to TO_TYPE. */
3500 TYPE_REFERENCE_TO (to_type) = t;
3507 /* Build a type that is compatible with t but has no cv quals anywhere
3510 const char *const *const * -> char ***. */
3513 build_type_no_quals (t)
3516 switch (TREE_CODE (t))
3519 return build_pointer_type (build_type_no_quals (TREE_TYPE (t)));
3520 case REFERENCE_TYPE:
3521 return build_reference_type (build_type_no_quals (TREE_TYPE (t)));
3523 return TYPE_MAIN_VARIANT (t);
3527 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
3528 MAXVAL should be the maximum value in the domain
3529 (one less than the length of the array).
3531 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
3532 We don't enforce this limit, that is up to caller (e.g. language front end).
3533 The limit exists because the result is a signed type and we don't handle
3534 sizes that use more than one HOST_WIDE_INT. */
3537 build_index_type (maxval)
3540 tree itype = make_node (INTEGER_TYPE);
3542 TREE_TYPE (itype) = sizetype;
3543 TYPE_PRECISION (itype) = TYPE_PRECISION (sizetype);
3544 TYPE_MIN_VALUE (itype) = size_zero_node;
3545 TYPE_MAX_VALUE (itype) = convert (sizetype, maxval);
3546 TYPE_MODE (itype) = TYPE_MODE (sizetype);
3547 TYPE_SIZE (itype) = TYPE_SIZE (sizetype);
3548 TYPE_SIZE_UNIT (itype) = TYPE_SIZE_UNIT (sizetype);
3549 TYPE_ALIGN (itype) = TYPE_ALIGN (sizetype);
3550 TYPE_USER_ALIGN (itype) = TYPE_USER_ALIGN (sizetype);
3552 if (host_integerp (maxval, 1))
3553 return type_hash_canon (tree_low_cst (maxval, 1), itype);
3558 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
3559 ENUMERAL_TYPE, BOOLEAN_TYPE, or CHAR_TYPE), with
3560 low bound LOWVAL and high bound HIGHVAL.
3561 if TYPE==NULL_TREE, sizetype is used. */
3564 build_range_type (type, lowval, highval)
3565 tree type, lowval, highval;
3567 tree itype = make_node (INTEGER_TYPE);
3569 TREE_TYPE (itype) = type;
3570 if (type == NULL_TREE)
3573 TYPE_MIN_VALUE (itype) = convert (type, lowval);
3574 TYPE_MAX_VALUE (itype) = highval ? convert (type, highval) : NULL;
3576 TYPE_PRECISION (itype) = TYPE_PRECISION (type);
3577 TYPE_MODE (itype) = TYPE_MODE (type);
3578 TYPE_SIZE (itype) = TYPE_SIZE (type);
3579 TYPE_SIZE_UNIT (itype) = TYPE_SIZE_UNIT (type);
3580 TYPE_ALIGN (itype) = TYPE_ALIGN (type);
3581 TYPE_USER_ALIGN (itype) = TYPE_USER_ALIGN (type);
3583 if (host_integerp (lowval, 0) && highval != 0 && host_integerp (highval, 0))
3584 return type_hash_canon (tree_low_cst (highval, 0)
3585 - tree_low_cst (lowval, 0),
3591 /* Just like build_index_type, but takes lowval and highval instead
3592 of just highval (maxval). */
3595 build_index_2_type (lowval, highval)
3596 tree lowval, highval;
3598 return build_range_type (sizetype, lowval, highval);
3601 /* Return nonzero iff ITYPE1 and ITYPE2 are equal (in the LISP sense).
3602 Needed because when index types are not hashed, equal index types
3603 built at different times appear distinct, even though structurally,
3607 index_type_equal (itype1, itype2)
3608 tree itype1, itype2;
3610 if (TREE_CODE (itype1) != TREE_CODE (itype2))
3613 if (TREE_CODE (itype1) == INTEGER_TYPE)
3615 if (TYPE_PRECISION (itype1) != TYPE_PRECISION (itype2)
3616 || TYPE_MODE (itype1) != TYPE_MODE (itype2)
3617 || simple_cst_equal (TYPE_SIZE (itype1), TYPE_SIZE (itype2)) != 1
3618 || TYPE_ALIGN (itype1) != TYPE_ALIGN (itype2))
3621 if (1 == simple_cst_equal (TYPE_MIN_VALUE (itype1),
3622 TYPE_MIN_VALUE (itype2))
3623 && 1 == simple_cst_equal (TYPE_MAX_VALUE (itype1),
3624 TYPE_MAX_VALUE (itype2)))
3631 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
3632 and number of elements specified by the range of values of INDEX_TYPE.
3633 If such a type has already been constructed, reuse it. */
3636 build_array_type (elt_type, index_type)
3637 tree elt_type, index_type;
3640 unsigned int hashcode;
3642 if (TREE_CODE (elt_type) == FUNCTION_TYPE)
3644 error ("arrays of functions are not meaningful");
3645 elt_type = integer_type_node;
3648 /* Make sure TYPE_POINTER_TO (elt_type) is filled in. */
3649 build_pointer_type (elt_type);
3651 /* Allocate the array after the pointer type,
3652 in case we free it in type_hash_canon. */
3653 t = make_node (ARRAY_TYPE);
3654 TREE_TYPE (t) = elt_type;
3655 TYPE_DOMAIN (t) = index_type;
3657 if (index_type == 0)
3662 hashcode = TYPE_HASH (elt_type) + TYPE_HASH (index_type);
3663 t = type_hash_canon (hashcode, t);
3665 if (!COMPLETE_TYPE_P (t))
3670 /* Return the TYPE of the elements comprising
3671 the innermost dimension of ARRAY. */
3674 get_inner_array_type (array)
3677 tree type = TREE_TYPE (array);
3679 while (TREE_CODE (type) == ARRAY_TYPE)
3680 type = TREE_TYPE (type);
3685 /* Construct, lay out and return
3686 the type of functions returning type VALUE_TYPE
3687 given arguments of types ARG_TYPES.
3688 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
3689 are data type nodes for the arguments of the function.
3690 If such a type has already been constructed, reuse it. */
3693 build_function_type (value_type, arg_types)
3694 tree value_type, arg_types;
3697 unsigned int hashcode;
3699 if (TREE_CODE (value_type) == FUNCTION_TYPE)
3701 error ("function return type cannot be function");
3702 value_type = integer_type_node;
3705 /* Make a node of the sort we want. */
3706 t = make_node (FUNCTION_TYPE);
3707 TREE_TYPE (t) = value_type;
3708 TYPE_ARG_TYPES (t) = arg_types;
3710 /* If we already have such a type, use the old one and free this one. */
3711 hashcode = TYPE_HASH (value_type) + type_hash_list (arg_types);
3712 t = type_hash_canon (hashcode, t);
3714 if (!COMPLETE_TYPE_P (t))
3719 /* Build a function type. The RETURN_TYPE is the type retured by the
3720 function. If additional arguments are provided, they are
3721 additional argument types. The list of argument types must always
3722 be terminated by NULL_TREE. */
3725 build_function_type_list VPARAMS ((tree return_type, ...))
3729 VA_OPEN (p, return_type);
3730 VA_FIXEDARG (p, tree, return_type);
3732 t = va_arg (p, tree);
3733 for (args = NULL_TREE; t != NULL_TREE; t = va_arg (p, tree))
3734 args = tree_cons (NULL_TREE, t, args);
3737 args = nreverse (args);
3738 TREE_CHAIN (last) = void_list_node;
3739 args = build_function_type (return_type, args);
3745 /* Construct, lay out and return the type of methods belonging to class
3746 BASETYPE and whose arguments and values are described by TYPE.
3747 If that type exists already, reuse it.
3748 TYPE must be a FUNCTION_TYPE node. */
3751 build_method_type (basetype, type)
3752 tree basetype, type;
3755 unsigned int hashcode;
3757 /* Make a node of the sort we want. */
3758 t = make_node (METHOD_TYPE);
3760 if (TREE_CODE (type) != FUNCTION_TYPE)
3763 TYPE_METHOD_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
3764 TREE_TYPE (t) = TREE_TYPE (type);
3766 /* The actual arglist for this function includes a "hidden" argument
3767 which is "this". Put it into the list of argument types. */
3770 = tree_cons (NULL_TREE,
3771 build_pointer_type (basetype), TYPE_ARG_TYPES (type));
3773 /* If we already have such a type, use the old one and free this one. */
3774 hashcode = TYPE_HASH (basetype) + TYPE_HASH (type);
3775 t = type_hash_canon (hashcode, t);
3777 if (!COMPLETE_TYPE_P (t))
3783 /* Construct, lay out and return the type of offsets to a value
3784 of type TYPE, within an object of type BASETYPE.
3785 If a suitable offset type exists already, reuse it. */
3788 build_offset_type (basetype, type)
3789 tree basetype, type;
3792 unsigned int hashcode;
3794 /* Make a node of the sort we want. */
3795 t = make_node (OFFSET_TYPE);
3797 TYPE_OFFSET_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
3798 TREE_TYPE (t) = type;
3800 /* If we already have such a type, use the old one and free this one. */
3801 hashcode = TYPE_HASH (basetype) + TYPE_HASH (type);
3802 t = type_hash_canon (hashcode, t);
3804 if (!COMPLETE_TYPE_P (t))
3810 /* Create a complex type whose components are COMPONENT_TYPE. */
3813 build_complex_type (component_type)
3814 tree component_type;
3817 unsigned int hashcode;
3819 /* Make a node of the sort we want. */
3820 t = make_node (COMPLEX_TYPE);
3822 TREE_TYPE (t) = TYPE_MAIN_VARIANT (component_type);
3823 set_type_quals (t, TYPE_QUALS (component_type));
3825 /* If we already have such a type, use the old one and free this one. */
3826 hashcode = TYPE_HASH (component_type);
3827 t = type_hash_canon (hashcode, t);
3829 if (!COMPLETE_TYPE_P (t))
3832 /* If we are writing Dwarf2 output we need to create a name,
3833 since complex is a fundamental type. */
3834 if ((write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
3838 if (component_type == char_type_node)
3839 name = "complex char";
3840 else if (component_type == signed_char_type_node)
3841 name = "complex signed char";
3842 else if (component_type == unsigned_char_type_node)
3843 name = "complex unsigned char";
3844 else if (component_type == short_integer_type_node)
3845 name = "complex short int";
3846 else if (component_type == short_unsigned_type_node)
3847 name = "complex short unsigned int";
3848 else if (component_type == integer_type_node)
3849 name = "complex int";
3850 else if (component_type == unsigned_type_node)
3851 name = "complex unsigned int";
3852 else if (component_type == long_integer_type_node)
3853 name = "complex long int";
3854 else if (component_type == long_unsigned_type_node)
3855 name = "complex long unsigned int";
3856 else if (component_type == long_long_integer_type_node)
3857 name = "complex long long int";
3858 else if (component_type == long_long_unsigned_type_node)
3859 name = "complex long long unsigned int";
3864 TYPE_NAME (t) = get_identifier (name);
3870 /* Return OP, stripped of any conversions to wider types as much as is safe.
3871 Converting the value back to OP's type makes a value equivalent to OP.
3873 If FOR_TYPE is nonzero, we return a value which, if converted to
3874 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
3876 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
3877 narrowest type that can hold the value, even if they don't exactly fit.
3878 Otherwise, bit-field references are changed to a narrower type
3879 only if they can be fetched directly from memory in that type.
3881 OP must have integer, real or enumeral type. Pointers are not allowed!
3883 There are some cases where the obvious value we could return
3884 would regenerate to OP if converted to OP's type,
3885 but would not extend like OP to wider types.
3886 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
3887 For example, if OP is (unsigned short)(signed char)-1,
3888 we avoid returning (signed char)-1 if FOR_TYPE is int,
3889 even though extending that to an unsigned short would regenerate OP,
3890 since the result of extending (signed char)-1 to (int)
3891 is different from (int) OP. */
3894 get_unwidened (op, for_type)
3898 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
3899 tree type = TREE_TYPE (op);
3901 = TYPE_PRECISION (for_type != 0 ? for_type : type);
3903 = (for_type != 0 && for_type != type
3904 && final_prec > TYPE_PRECISION (type)
3905 && TREE_UNSIGNED (type));
3908 while (TREE_CODE (op) == NOP_EXPR)
3911 = TYPE_PRECISION (TREE_TYPE (op))
3912 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0)));
3914 /* Truncations are many-one so cannot be removed.
3915 Unless we are later going to truncate down even farther. */
3917 && final_prec > TYPE_PRECISION (TREE_TYPE (op)))
3920 /* See what's inside this conversion. If we decide to strip it,
3922 op = TREE_OPERAND (op, 0);
3924 /* If we have not stripped any zero-extensions (uns is 0),
3925 we can strip any kind of extension.
3926 If we have previously stripped a zero-extension,
3927 only zero-extensions can safely be stripped.
3928 Any extension can be stripped if the bits it would produce
3929 are all going to be discarded later by truncating to FOR_TYPE. */
3933 if (! uns || final_prec <= TYPE_PRECISION (TREE_TYPE (op)))
3935 /* TREE_UNSIGNED says whether this is a zero-extension.
3936 Let's avoid computing it if it does not affect WIN
3937 and if UNS will not be needed again. */
3938 if ((uns || TREE_CODE (op) == NOP_EXPR)
3939 && TREE_UNSIGNED (TREE_TYPE (op)))
3947 if (TREE_CODE (op) == COMPONENT_REF
3948 /* Since type_for_size always gives an integer type. */
3949 && TREE_CODE (type) != REAL_TYPE
3950 /* Don't crash if field not laid out yet. */
3951 && DECL_SIZE (TREE_OPERAND (op, 1)) != 0
3952 && host_integerp (DECL_SIZE (TREE_OPERAND (op, 1)), 1))
3954 unsigned int innerprec
3955 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op, 1)), 1);
3956 int unsignedp = TREE_UNSIGNED (TREE_OPERAND (op, 1));
3957 type = (*lang_hooks.types.type_for_size) (innerprec, unsignedp);
3959 /* We can get this structure field in the narrowest type it fits in.
3960 If FOR_TYPE is 0, do this only for a field that matches the
3961 narrower type exactly and is aligned for it
3962 The resulting extension to its nominal type (a fullword type)
3963 must fit the same conditions as for other extensions. */
3965 if (innerprec < TYPE_PRECISION (TREE_TYPE (op))
3966 && (for_type || ! DECL_BIT_FIELD (TREE_OPERAND (op, 1)))
3967 && (! uns || final_prec <= innerprec || unsignedp)
3970 win = build (COMPONENT_REF, type, TREE_OPERAND (op, 0),
3971 TREE_OPERAND (op, 1));
3972 TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op);
3973 TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op);
3980 /* Return OP or a simpler expression for a narrower value
3981 which can be sign-extended or zero-extended to give back OP.
3982 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
3983 or 0 if the value should be sign-extended. */
3986 get_narrower (op, unsignedp_ptr)
3994 while (TREE_CODE (op) == NOP_EXPR)
3997 = (TYPE_PRECISION (TREE_TYPE (op))
3998 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0))));
4000 /* Truncations are many-one so cannot be removed. */
4004 /* See what's inside this conversion. If we decide to strip it,
4006 op = TREE_OPERAND (op, 0);
4010 /* An extension: the outermost one can be stripped,
4011 but remember whether it is zero or sign extension. */
4013 uns = TREE_UNSIGNED (TREE_TYPE (op));
4014 /* Otherwise, if a sign extension has been stripped,
4015 only sign extensions can now be stripped;
4016 if a zero extension has been stripped, only zero-extensions. */
4017 else if (uns != TREE_UNSIGNED (TREE_TYPE (op)))
4021 else /* bitschange == 0 */
4023 /* A change in nominal type can always be stripped, but we must
4024 preserve the unsignedness. */
4026 uns = TREE_UNSIGNED (TREE_TYPE (op));
4033 if (TREE_CODE (op) == COMPONENT_REF
4034 /* Since type_for_size always gives an integer type. */
4035 && TREE_CODE (TREE_TYPE (op)) != REAL_TYPE
4036 /* Ensure field is laid out already. */
4037 && DECL_SIZE (TREE_OPERAND (op, 1)) != 0)
4039 unsigned HOST_WIDE_INT innerprec
4040 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op, 1)), 1);
4041 tree type = (*lang_hooks.types.type_for_size) (innerprec,
4042 TREE_UNSIGNED (op));
4044 /* We can get this structure field in a narrower type that fits it,
4045 but the resulting extension to its nominal type (a fullword type)
4046 must satisfy the same conditions as for other extensions.
4048 Do this only for fields that are aligned (not bit-fields),
4049 because when bit-field insns will be used there is no
4050 advantage in doing this. */
4052 if (innerprec < TYPE_PRECISION (TREE_TYPE (op))
4053 && ! DECL_BIT_FIELD (TREE_OPERAND (op, 1))
4054 && (first || uns == TREE_UNSIGNED (TREE_OPERAND (op, 1)))
4058 uns = TREE_UNSIGNED (TREE_OPERAND (op, 1));
4059 win = build (COMPONENT_REF, type, TREE_OPERAND (op, 0),
4060 TREE_OPERAND (op, 1));
4061 TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op);
4062 TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op);
4065 *unsignedp_ptr = uns;
4069 /* Nonzero if integer constant C has a value that is permissible
4070 for type TYPE (an INTEGER_TYPE). */
4073 int_fits_type_p (c, type)
4076 /* If the bounds of the type are integers, we can check ourselves.
4077 If not, but this type is a subtype, try checking against that.
4078 Otherwise, use force_fit_type, which checks against the precision. */
4079 if (TYPE_MAX_VALUE (type) != NULL_TREE
4080 && TYPE_MIN_VALUE (type) != NULL_TREE
4081 && TREE_CODE (TYPE_MAX_VALUE (type)) == INTEGER_CST
4082 && TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST)
4084 if (TREE_UNSIGNED (type))
4085 return (! INT_CST_LT_UNSIGNED (TYPE_MAX_VALUE (type), c)
4086 && ! INT_CST_LT_UNSIGNED (c, TYPE_MIN_VALUE (type))
4087 /* Negative ints never fit unsigned types. */
4088 && ! (TREE_INT_CST_HIGH (c) < 0
4089 && ! TREE_UNSIGNED (TREE_TYPE (c))));
4091 return (! INT_CST_LT (TYPE_MAX_VALUE (type), c)
4092 && ! INT_CST_LT (c, TYPE_MIN_VALUE (type))
4093 /* Unsigned ints with top bit set never fit signed types. */
4094 && ! (TREE_INT_CST_HIGH (c) < 0
4095 && TREE_UNSIGNED (TREE_TYPE (c))));
4097 else if (TREE_CODE (type) == INTEGER_TYPE && TREE_TYPE (type) != 0)
4098 return int_fits_type_p (c, TREE_TYPE (type));
4102 TREE_TYPE (c) = type;
4103 return !force_fit_type (c, 0);
4107 /* Returns true if T is, contains, or refers to a type with variable
4108 size. This concept is more general than that of C99 'variably
4109 modified types': in C99, a struct type is never variably modified
4110 because a VLA may not appear as a structure member. However, in
4113 struct S { int i[f()]; };
4115 is valid, and other languages may define similar constructs. */
4118 variably_modified_type_p (type)
4121 /* If TYPE itself has variable size, it is variably modified.
4123 We do not yet have a representation of the C99 '[*]' syntax.
4124 When a representation is chosen, this function should be modified
4125 to test for that case as well. */
4126 if (TYPE_SIZE (type)
4127 && TYPE_SIZE (type) != error_mark_node
4128 && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)
4131 /* If TYPE is a pointer or reference, it is variably modified if
4132 the type pointed to is variably modified. */
4133 if ((TREE_CODE (type) == POINTER_TYPE
4134 || TREE_CODE (type) == REFERENCE_TYPE)
4135 && variably_modified_type_p (TREE_TYPE (type)))
4138 /* If TYPE is an array, it is variably modified if the array
4139 elements are. (Note that the VLA case has already been checked
4141 if (TREE_CODE (type) == ARRAY_TYPE
4142 && variably_modified_type_p (TREE_TYPE (type)))
4145 /* If TYPE is a function type, it is variably modified if any of the
4146 parameters or the return type are variably modified. */
4147 if (TREE_CODE (type) == FUNCTION_TYPE
4148 || TREE_CODE (type) == METHOD_TYPE)
4152 if (variably_modified_type_p (TREE_TYPE (type)))
4154 for (parm = TYPE_ARG_TYPES (type);
4155 parm && parm != void_list_node;
4156 parm = TREE_CHAIN (parm))
4157 if (variably_modified_type_p (TREE_VALUE (parm)))
4161 /* The current language may have other cases to check, but in general,
4162 all other types are not variably modified. */
4163 return (*lang_hooks.tree_inlining.var_mod_type_p) (type);
4166 /* Given a DECL or TYPE, return the scope in which it was declared, or
4167 NULL_TREE if there is no containing scope. */
4170 get_containing_scope (t)
4173 return (TYPE_P (t) ? TYPE_CONTEXT (t) : DECL_CONTEXT (t));
4176 /* Return the innermost context enclosing DECL that is
4177 a FUNCTION_DECL, or zero if none. */
4180 decl_function_context (decl)
4185 if (TREE_CODE (decl) == ERROR_MARK)
4188 if (TREE_CODE (decl) == SAVE_EXPR)
4189 context = SAVE_EXPR_CONTEXT (decl);
4191 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
4192 where we look up the function at runtime. Such functions always take
4193 a first argument of type 'pointer to real context'.
4195 C++ should really be fixed to use DECL_CONTEXT for the real context,
4196 and use something else for the "virtual context". */
4197 else if (TREE_CODE (decl) == FUNCTION_DECL && DECL_VINDEX (decl))
4200 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)))));
4202 context = DECL_CONTEXT (decl);
4204 while (context && TREE_CODE (context) != FUNCTION_DECL)
4206 if (TREE_CODE (context) == BLOCK)
4207 context = BLOCK_SUPERCONTEXT (context);
4209 context = get_containing_scope (context);
4215 /* Return the innermost context enclosing DECL that is
4216 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
4217 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
4220 decl_type_context (decl)
4223 tree context = DECL_CONTEXT (decl);
4227 if (TREE_CODE (context) == NAMESPACE_DECL)
4230 if (TREE_CODE (context) == RECORD_TYPE
4231 || TREE_CODE (context) == UNION_TYPE
4232 || TREE_CODE (context) == QUAL_UNION_TYPE)
4235 if (TREE_CODE (context) == TYPE_DECL
4236 || TREE_CODE (context) == FUNCTION_DECL)
4237 context = DECL_CONTEXT (context);
4239 else if (TREE_CODE (context) == BLOCK)
4240 context = BLOCK_SUPERCONTEXT (context);
4243 /* Unhandled CONTEXT!? */
4249 /* CALL is a CALL_EXPR. Return the declaration for the function
4250 called, or NULL_TREE if the called function cannot be
4254 get_callee_fndecl (call)
4259 /* It's invalid to call this function with anything but a
4261 if (TREE_CODE (call) != CALL_EXPR)
4264 /* The first operand to the CALL is the address of the function
4266 addr = TREE_OPERAND (call, 0);
4270 /* If this is a readonly function pointer, extract its initial value. */
4271 if (DECL_P (addr) && TREE_CODE (addr) != FUNCTION_DECL
4272 && TREE_READONLY (addr) && ! TREE_THIS_VOLATILE (addr)
4273 && DECL_INITIAL (addr))
4274 addr = DECL_INITIAL (addr);
4276 /* If the address is just `&f' for some function `f', then we know
4277 that `f' is being called. */
4278 if (TREE_CODE (addr) == ADDR_EXPR
4279 && TREE_CODE (TREE_OPERAND (addr, 0)) == FUNCTION_DECL)
4280 return TREE_OPERAND (addr, 0);
4282 /* We couldn't figure out what was being called. */
4286 /* Print debugging information about the obstack O, named STR. */
4289 print_obstack_statistics (str, o)
4293 struct _obstack_chunk *chunk = o->chunk;
4297 n_alloc += o->next_free - chunk->contents;
4298 chunk = chunk->prev;
4302 n_alloc += chunk->limit - &chunk->contents[0];
4303 chunk = chunk->prev;
4305 fprintf (stderr, "obstack %s: %u bytes, %d chunks\n",
4306 str, n_alloc, n_chunks);
4309 /* Print debugging information about tree nodes generated during the compile,
4310 and any language-specific information. */
4313 dump_tree_statistics ()
4315 #ifdef GATHER_STATISTICS
4317 int total_nodes, total_bytes;
4320 fprintf (stderr, "\n??? tree nodes created\n\n");
4321 #ifdef GATHER_STATISTICS
4322 fprintf (stderr, "Kind Nodes Bytes\n");
4323 fprintf (stderr, "-------------------------------------\n");
4324 total_nodes = total_bytes = 0;
4325 for (i = 0; i < (int) all_kinds; i++)
4327 fprintf (stderr, "%-20s %6d %9d\n", tree_node_kind_names[i],
4328 tree_node_counts[i], tree_node_sizes[i]);
4329 total_nodes += tree_node_counts[i];
4330 total_bytes += tree_node_sizes[i];
4332 fprintf (stderr, "-------------------------------------\n");
4333 fprintf (stderr, "%-20s %6d %9d\n", "Total", total_nodes, total_bytes);
4334 fprintf (stderr, "-------------------------------------\n");
4336 fprintf (stderr, "(No per-node statistics)\n");
4338 print_type_hash_statistics ();
4339 (*lang_hooks.print_statistics) ();
4342 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
4344 /* Appends 6 random characters to TEMPLATE to (hopefully) avoid name
4345 clashes in cases where we can't reliably choose a unique name.
4347 Derived from mkstemp.c in libiberty. */
4350 append_random_chars (template)
4353 static const char letters[]
4354 = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
4355 static unsigned HOST_WIDE_INT value;
4356 unsigned HOST_WIDE_INT v;
4362 /* VALUE should be unique for each file and must not change between
4363 compiles since this can cause bootstrap comparison errors. */
4365 if (stat (main_input_filename, &st) < 0)
4367 /* This can happen when preprocessed text is shipped between
4368 machines, e.g. with bug reports. Assume that uniqueness
4369 isn't actually an issue. */
4374 /* In VMS, ino is an array, so we have to use both values. We
4375 conditionalize that. */
4377 #define INO_TO_INT(INO) ((int) (INO)[1] << 16 ^ (int) (INO)[2])
4379 #define INO_TO_INT(INO) INO
4381 value = st.st_dev ^ INO_TO_INT (st.st_ino) ^ st.st_mtime;
4385 template += strlen (template);
4389 /* Fill in the random bits. */
4390 template[0] = letters[v % 62];
4392 template[1] = letters[v % 62];
4394 template[2] = letters[v % 62];
4396 template[3] = letters[v % 62];
4398 template[4] = letters[v % 62];
4400 template[5] = letters[v % 62];
4405 /* P is a string that will be used in a symbol. Mask out any characters
4406 that are not valid in that context. */
4409 clean_symbol_name (p)
4414 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
4417 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
4424 /* Generate a name for a function unique to this translation unit.
4425 TYPE is some string to identify the purpose of this function to the
4426 linker or collect2. */
4429 get_file_function_name_long (type)
4436 if (first_global_object_name)
4437 p = first_global_object_name;
4440 /* We don't have anything that we know to be unique to this translation
4441 unit, so use what we do have and throw in some randomness. */
4443 const char *name = weak_global_object_name;
4444 const char *file = main_input_filename;
4449 file = input_filename;
4451 q = (char *) alloca (7 + strlen (name) + strlen (file));
4453 sprintf (q, "%s%s", name, file);
4454 append_random_chars (q);
4458 buf = (char *) alloca (sizeof (FILE_FUNCTION_FORMAT) + strlen (p)
4461 /* Set up the name of the file-level functions we may need.
4462 Use a global object (which is already required to be unique over
4463 the program) rather than the file name (which imposes extra
4465 sprintf (buf, FILE_FUNCTION_FORMAT, type, p);
4467 /* Don't need to pull weird characters out of global names. */
4468 if (p != first_global_object_name)
4469 clean_symbol_name (buf + 11);
4471 return get_identifier (buf);
4474 /* If KIND=='I', return a suitable global initializer (constructor) name.
4475 If KIND=='D', return a suitable global clean-up (destructor) name. */
4478 get_file_function_name (kind)
4486 return get_file_function_name_long (p);
4489 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
4490 The result is placed in BUFFER (which has length BIT_SIZE),
4491 with one bit in each char ('\000' or '\001').
4493 If the constructor is constant, NULL_TREE is returned.
4494 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
4497 get_set_constructor_bits (init, buffer, bit_size)
4504 HOST_WIDE_INT domain_min
4505 = tree_low_cst (TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (init))), 0);
4506 tree non_const_bits = NULL_TREE;
4508 for (i = 0; i < bit_size; i++)
4511 for (vals = TREE_OPERAND (init, 1);
4512 vals != NULL_TREE; vals = TREE_CHAIN (vals))
4514 if (!host_integerp (TREE_VALUE (vals), 0)
4515 || (TREE_PURPOSE (vals) != NULL_TREE
4516 && !host_integerp (TREE_PURPOSE (vals), 0)))
4518 = tree_cons (TREE_PURPOSE (vals), TREE_VALUE (vals), non_const_bits);
4519 else if (TREE_PURPOSE (vals) != NULL_TREE)
4521 /* Set a range of bits to ones. */
4522 HOST_WIDE_INT lo_index
4523 = tree_low_cst (TREE_PURPOSE (vals), 0) - domain_min;
4524 HOST_WIDE_INT hi_index
4525 = tree_low_cst (TREE_VALUE (vals), 0) - domain_min;
4527 if (lo_index < 0 || lo_index >= bit_size
4528 || hi_index < 0 || hi_index >= bit_size)
4530 for (; lo_index <= hi_index; lo_index++)
4531 buffer[lo_index] = 1;
4535 /* Set a single bit to one. */
4537 = tree_low_cst (TREE_VALUE (vals), 0) - domain_min;
4538 if (index < 0 || index >= bit_size)
4540 error ("invalid initializer for bit string");
4546 return non_const_bits;
4549 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
4550 The result is placed in BUFFER (which is an array of bytes).
4551 If the constructor is constant, NULL_TREE is returned.
4552 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
4555 get_set_constructor_bytes (init, buffer, wd_size)
4557 unsigned char *buffer;
4561 int set_word_size = BITS_PER_UNIT;
4562 int bit_size = wd_size * set_word_size;
4564 unsigned char *bytep = buffer;
4565 char *bit_buffer = (char *) alloca (bit_size);
4566 tree non_const_bits = get_set_constructor_bits (init, bit_buffer, bit_size);
4568 for (i = 0; i < wd_size; i++)
4571 for (i = 0; i < bit_size; i++)
4575 if (BYTES_BIG_ENDIAN)
4576 *bytep |= (1 << (set_word_size - 1 - bit_pos));
4578 *bytep |= 1 << bit_pos;
4581 if (bit_pos >= set_word_size)
4582 bit_pos = 0, bytep++;
4584 return non_const_bits;
4587 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
4588 /* Complain that the tree code of NODE does not match the expected CODE.
4589 FILE, LINE, and FUNCTION are of the caller. */
4592 tree_check_failed (node, code, file, line, function)
4594 enum tree_code code;
4597 const char *function;
4599 internal_error ("tree check: expected %s, have %s in %s, at %s:%d",
4600 tree_code_name[code], tree_code_name[TREE_CODE (node)],
4601 function, trim_filename (file), line);
4604 /* Similar to above, except that we check for a class of tree
4605 code, given in CL. */
4608 tree_class_check_failed (node, cl, file, line, function)
4613 const char *function;
4616 ("tree check: expected class '%c', have '%c' (%s) in %s, at %s:%d",
4617 cl, TREE_CODE_CLASS (TREE_CODE (node)),
4618 tree_code_name[TREE_CODE (node)], function, trim_filename (file), line);
4621 /* Similar to above, except that the check is for the bounds of a TREE_VEC's
4622 (dynamically sized) vector. */
4625 tree_vec_elt_check_failed (idx, len, file, line, function)
4630 const char *function;
4633 ("tree check: accessed elt %d of tree_vec with %d elts in %s, at %s:%d",
4634 idx + 1, len, function, trim_filename (file), line);
4637 #endif /* ENABLE_TREE_CHECKING */
4639 /* For a new vector type node T, build the information necessary for
4640 debugging output. */
4643 finish_vector_type (t)
4649 tree index = build_int_2 (TYPE_VECTOR_SUBPARTS (t) - 1, 0);
4650 tree array = build_array_type (TREE_TYPE (t),
4651 build_index_type (index));
4652 tree rt = make_node (RECORD_TYPE);
4654 TYPE_FIELDS (rt) = build_decl (FIELD_DECL, get_identifier ("f"), array);
4655 DECL_CONTEXT (TYPE_FIELDS (rt)) = rt;
4657 TYPE_DEBUG_REPRESENTATION_TYPE (t) = rt;
4658 /* In dwarfout.c, type lookup uses TYPE_UID numbers. We want to output
4659 the representation type, and we want to find that die when looking up
4660 the vector type. This is most easily achieved by making the TYPE_UID
4662 TYPE_UID (rt) = TYPE_UID (t);
4666 /* Create nodes for all integer types (and error_mark_node) using the sizes
4667 of C datatypes. The caller should call set_sizetype soon after calling
4668 this function to select one of the types as sizetype. */
4671 build_common_tree_nodes (signed_char)
4674 error_mark_node = make_node (ERROR_MARK);
4675 TREE_TYPE (error_mark_node) = error_mark_node;
4677 initialize_sizetypes ();
4679 /* Define both `signed char' and `unsigned char'. */
4680 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
4681 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
4683 /* Define `char', which is like either `signed char' or `unsigned char'
4684 but not the same as either. */
4687 ? make_signed_type (CHAR_TYPE_SIZE)
4688 : make_unsigned_type (CHAR_TYPE_SIZE));
4690 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
4691 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
4692 integer_type_node = make_signed_type (INT_TYPE_SIZE);
4693 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
4694 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
4695 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
4696 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
4697 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
4699 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
4700 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
4701 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
4702 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
4703 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
4705 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
4706 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
4707 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
4708 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
4709 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
4712 /* Call this function after calling build_common_tree_nodes and set_sizetype.
4713 It will create several other common tree nodes. */
4716 build_common_tree_nodes_2 (short_double)
4719 /* Define these next since types below may used them. */
4720 integer_zero_node = build_int_2 (0, 0);
4721 integer_one_node = build_int_2 (1, 0);
4722 integer_minus_one_node = build_int_2 (-1, -1);
4724 size_zero_node = size_int (0);
4725 size_one_node = size_int (1);
4726 bitsize_zero_node = bitsize_int (0);
4727 bitsize_one_node = bitsize_int (1);
4728 bitsize_unit_node = bitsize_int (BITS_PER_UNIT);
4730 void_type_node = make_node (VOID_TYPE);
4731 layout_type (void_type_node);
4733 /* We are not going to have real types in C with less than byte alignment,
4734 so we might as well not have any types that claim to have it. */
4735 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
4736 TYPE_USER_ALIGN (void_type_node) = 0;
4738 null_pointer_node = build_int_2 (0, 0);
4739 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
4740 layout_type (TREE_TYPE (null_pointer_node));
4742 ptr_type_node = build_pointer_type (void_type_node);
4744 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
4746 float_type_node = make_node (REAL_TYPE);
4747 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
4748 layout_type (float_type_node);
4750 double_type_node = make_node (REAL_TYPE);
4752 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
4754 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
4755 layout_type (double_type_node);
4757 long_double_type_node = make_node (REAL_TYPE);
4758 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
4759 layout_type (long_double_type_node);
4761 complex_integer_type_node = make_node (COMPLEX_TYPE);
4762 TREE_TYPE (complex_integer_type_node) = integer_type_node;
4763 layout_type (complex_integer_type_node);
4765 complex_float_type_node = make_node (COMPLEX_TYPE);
4766 TREE_TYPE (complex_float_type_node) = float_type_node;
4767 layout_type (complex_float_type_node);
4769 complex_double_type_node = make_node (COMPLEX_TYPE);
4770 TREE_TYPE (complex_double_type_node) = double_type_node;
4771 layout_type (complex_double_type_node);
4773 complex_long_double_type_node = make_node (COMPLEX_TYPE);
4774 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
4775 layout_type (complex_long_double_type_node);
4779 BUILD_VA_LIST_TYPE (t);
4781 /* Many back-ends define record types without seting TYPE_NAME.
4782 If we copied the record type here, we'd keep the original
4783 record type without a name. This breaks name mangling. So,
4784 don't copy record types and let c_common_nodes_and_builtins()
4785 declare the type to be __builtin_va_list. */
4786 if (TREE_CODE (t) != RECORD_TYPE)
4787 t = build_type_copy (t);
4789 va_list_type_node = t;
4792 unsigned_V4SI_type_node
4793 = make_vector (V4SImode, unsigned_intSI_type_node, 1);
4794 unsigned_V2HI_type_node
4795 = make_vector (V2HImode, unsigned_intHI_type_node, 1);
4796 unsigned_V2SI_type_node
4797 = make_vector (V2SImode, unsigned_intSI_type_node, 1);
4798 unsigned_V2DI_type_node
4799 = make_vector (V2DImode, unsigned_intDI_type_node, 1);
4800 unsigned_V4HI_type_node
4801 = make_vector (V4HImode, unsigned_intHI_type_node, 1);
4802 unsigned_V8QI_type_node
4803 = make_vector (V8QImode, unsigned_intQI_type_node, 1);
4804 unsigned_V8HI_type_node
4805 = make_vector (V8HImode, unsigned_intHI_type_node, 1);
4806 unsigned_V16QI_type_node
4807 = make_vector (V16QImode, unsigned_intQI_type_node, 1);
4808 unsigned_V1DI_type_node
4809 = make_vector (V1DImode, unsigned_intDI_type_node, 1);
4811 V16SF_type_node = make_vector (V16SFmode, float_type_node, 0);
4812 V4SF_type_node = make_vector (V4SFmode, float_type_node, 0);
4813 V4SI_type_node = make_vector (V4SImode, intSI_type_node, 0);
4814 V2HI_type_node = make_vector (V2HImode, intHI_type_node, 0);
4815 V2SI_type_node = make_vector (V2SImode, intSI_type_node, 0);
4816 V2DI_type_node = make_vector (V2DImode, intDI_type_node, 0);
4817 V4HI_type_node = make_vector (V4HImode, intHI_type_node, 0);
4818 V8QI_type_node = make_vector (V8QImode, intQI_type_node, 0);
4819 V8HI_type_node = make_vector (V8HImode, intHI_type_node, 0);
4820 V2SF_type_node = make_vector (V2SFmode, float_type_node, 0);
4821 V2DF_type_node = make_vector (V2DFmode, double_type_node, 0);
4822 V16QI_type_node = make_vector (V16QImode, intQI_type_node, 0);
4823 V1DI_type_node = make_vector (V1DImode, intDI_type_node, 0);
4826 /* Returns a vector tree node given a vector mode, the inner type, and
4830 make_vector (mode, innertype, unsignedp)
4831 enum machine_mode mode;
4837 t = make_node (VECTOR_TYPE);
4838 TREE_TYPE (t) = innertype;
4839 TYPE_MODE (t) = mode;
4840 TREE_UNSIGNED (TREE_TYPE (t)) = unsignedp;
4841 finish_vector_type (t);
4846 /* Given an initializer INIT, return TRUE if INIT is zero or some
4847 aggregate of zeros. Otherwise return FALSE. */
4850 initializer_zerop (init)
4855 switch (TREE_CODE (init))
4858 return integer_zerop (init);
4860 return real_zerop (init)
4861 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (init));
4863 return integer_zerop (init)
4864 || (real_zerop (init)
4865 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_REALPART (init)))
4866 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_IMAGPART (init))));
4869 if (AGGREGATE_TYPE_P (TREE_TYPE (init)))
4871 tree aggr_init = TREE_OPERAND (init, 1);
4875 if (! initializer_zerop (TREE_VALUE (aggr_init)))
4877 aggr_init = TREE_CHAIN (aggr_init);
4888 #include "gt-tree.h"