1 /* Language-independent node constructors for parse phase of GNU compiler.
2 Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This file contains the low level primitives for operating on tree nodes,
23 including allocation, list operations, interning of identifiers,
24 construction of data type nodes and statement nodes,
25 and construction of type conversion nodes. It also contains
26 tables index by tree code that describe how to take apart
29 It is intended to be language-independent, but occasionally
30 calls language-dependent routines defined (for C) in typecheck.c. */
34 #include "coretypes.h"
47 #include "langhooks.h"
48 #include "tree-iterator.h"
49 #include "basic-block.h"
50 #include "tree-flow.h"
53 /* obstack.[ch] explicitly declined to prototype this. */
54 extern int _obstack_allocated_p (struct obstack *h, void *obj);
56 #ifdef GATHER_STATISTICS
57 /* Statistics-gathering stuff. */
59 int tree_node_counts[(int) all_kinds];
60 int tree_node_sizes[(int) all_kinds];
62 /* Keep in sync with tree.h:enum tree_node_kind. */
63 static const char * const tree_node_kind_names[] = {
82 #endif /* GATHER_STATISTICS */
84 /* Unique id for next decl created. */
85 static GTY(()) int next_decl_uid;
86 /* Unique id for next type created. */
87 static GTY(()) int next_type_uid = 1;
89 /* Since we cannot rehash a type after it is in the table, we have to
90 keep the hash code. */
92 struct type_hash GTY(())
98 /* Additional language-dependent binfo slots. */
99 unsigned binfo_lang_slots;
101 /* Initial size of the hash table (rounded to next prime). */
102 #define TYPE_HASH_INITIAL_SIZE 1000
104 /* Now here is the hash table. When recording a type, it is added to
105 the slot whose index is the hash code. Note that the hash table is
106 used for several kinds of types (function types, array types and
107 array index range types, for now). While all these live in the
108 same table, they are completely independent, and the hash code is
109 computed differently for each of these. */
111 static GTY ((if_marked ("type_hash_marked_p"), param_is (struct type_hash)))
112 htab_t type_hash_table;
114 static void set_type_quals (tree, int);
115 static int type_hash_eq (const void *, const void *);
116 static hashval_t type_hash_hash (const void *);
117 static void print_type_hash_statistics (void);
118 static void finish_vector_type (tree);
119 static int type_hash_marked_p (const void *);
120 static unsigned int type_hash_list (tree, hashval_t);
121 static unsigned int attribute_hash_list (tree, hashval_t);
123 tree global_trees[TI_MAX];
124 tree integer_types[itk_none];
131 /* Initialize the hash table of types. */
132 type_hash_table = htab_create_ggc (TYPE_HASH_INITIAL_SIZE, type_hash_hash,
137 /* The name of the object as the assembler will see it (but before any
138 translations made by ASM_OUTPUT_LABELREF). Often this is the same
139 as DECL_NAME. It is an IDENTIFIER_NODE. */
141 decl_assembler_name (tree decl)
143 if (!DECL_ASSEMBLER_NAME_SET_P (decl))
144 lang_hooks.set_decl_assembler_name (decl);
145 return DECL_CHECK (decl)->decl.assembler_name;
148 /* Compute the number of bytes occupied by 'node'. This routine only
149 looks at TREE_CODE and, if the code is TREE_VEC, TREE_VEC_LENGTH. */
151 tree_size (tree node)
153 enum tree_code code = TREE_CODE (node);
155 switch (TREE_CODE_CLASS (code))
157 case 'd': /* A decl node */
158 return sizeof (struct tree_decl);
160 case 't': /* a type node */
161 return sizeof (struct tree_type);
163 case 'r': /* a reference */
164 case 'e': /* an expression */
165 case 's': /* an expression with side effects */
166 case '<': /* a comparison expression */
167 case '1': /* a unary arithmetic expression */
168 case '2': /* a binary arithmetic expression */
169 return (sizeof (struct tree_exp)
170 + TREE_CODE_LENGTH (code) * sizeof (char *) - sizeof (char *));
172 case 'c': /* a constant */
175 case INTEGER_CST: return sizeof (struct tree_int_cst);
176 case REAL_CST: return sizeof (struct tree_real_cst);
177 case COMPLEX_CST: return sizeof (struct tree_complex);
178 case VECTOR_CST: return sizeof (struct tree_vector);
179 case STRING_CST: return sizeof (struct tree_string);
181 return lang_hooks.tree_size (code);
184 case 'x': /* something random, like an identifier. */
187 case IDENTIFIER_NODE: return lang_hooks.identifier_size;
188 case TREE_LIST: return sizeof (struct tree_list);
189 case TREE_VEC: return (sizeof (struct tree_vec)
190 + TREE_VEC_LENGTH(node) * sizeof(char *)
194 case PLACEHOLDER_EXPR: return sizeof (struct tree_common);
196 case PHI_NODE: return (sizeof (struct tree_phi_node)
197 + (PHI_ARG_CAPACITY (node) - 1) *
198 sizeof (struct phi_arg_d));
200 case SSA_NAME: return sizeof (struct tree_ssa_name);
202 case STATEMENT_LIST: return sizeof (struct tree_statement_list);
203 case BLOCK: return sizeof (struct tree_block);
204 case VALUE_HANDLE: return sizeof (struct tree_value_handle);
207 return lang_hooks.tree_size (code);
215 /* Return a newly allocated node of code CODE.
216 For decl and type nodes, some other fields are initialized.
217 The rest of the node is initialized to zero.
219 Achoo! I got a code in the node. */
222 make_node_stat (enum tree_code code MEM_STAT_DECL)
225 int type = TREE_CODE_CLASS (code);
227 #ifdef GATHER_STATISTICS
230 struct tree_common ttmp;
232 /* We can't allocate a TREE_VEC, PHI_NODE, or STRING_CST
233 without knowing how many elements it will have. */
234 if (code == TREE_VEC || code == PHI_NODE)
237 TREE_SET_CODE ((tree)&ttmp, code);
238 length = tree_size ((tree)&ttmp);
240 #ifdef GATHER_STATISTICS
243 case 'd': /* A decl node */
247 case 't': /* a type node */
251 case 's': /* an expression with side effects */
255 case 'r': /* a reference */
259 case 'e': /* an expression */
260 case '<': /* a comparison expression */
261 case '1': /* a unary arithmetic expression */
262 case '2': /* a binary arithmetic expression */
266 case 'c': /* a constant */
270 case 'x': /* something random, like an identifier. */
271 if (code == IDENTIFIER_NODE)
273 else if (code == TREE_VEC)
275 else if (code == TREE_BINFO)
277 else if (code == PHI_NODE)
279 else if (code == SSA_NAME)
280 kind = ssa_name_kind;
281 else if (code == BLOCK)
291 tree_node_counts[(int) kind]++;
292 tree_node_sizes[(int) kind] += length;
295 t = ggc_alloc_zone_stat (length, tree_zone PASS_MEM_STAT);
297 memset (t, 0, length);
299 TREE_SET_CODE (t, code);
304 TREE_SIDE_EFFECTS (t) = 1;
308 if (code != FUNCTION_DECL)
310 DECL_USER_ALIGN (t) = 0;
311 DECL_IN_SYSTEM_HEADER (t) = in_system_header;
312 DECL_SOURCE_LOCATION (t) = input_location;
313 if (code == TRANSLATION_UNIT_DECL)
314 DECL_UID (t) = cur_in_fname;
316 DECL_UID (t) = next_decl_uid++;
318 /* We have not yet computed the alias set for this declaration. */
319 DECL_POINTER_ALIAS_SET (t) = -1;
323 TYPE_UID (t) = next_type_uid++;
324 TYPE_ALIGN (t) = char_type_node ? TYPE_ALIGN (char_type_node) : 0;
325 TYPE_USER_ALIGN (t) = 0;
326 TYPE_MAIN_VARIANT (t) = t;
328 /* Default to no attributes for type, but let target change that. */
329 TYPE_ATTRIBUTES (t) = NULL_TREE;
330 targetm.set_default_type_attributes (t);
332 /* We have not yet computed the alias set for this type. */
333 TYPE_ALIAS_SET (t) = -1;
337 TREE_CONSTANT (t) = 1;
338 TREE_INVARIANT (t) = 1;
347 case PREDECREMENT_EXPR:
348 case PREINCREMENT_EXPR:
349 case POSTDECREMENT_EXPR:
350 case POSTINCREMENT_EXPR:
351 /* All of these have side-effects, no matter what their
353 TREE_SIDE_EFFECTS (t) = 1;
365 /* Return a new node with the same contents as NODE except that its
366 TREE_CHAIN is zero and it has a fresh uid. */
369 copy_node_stat (tree node MEM_STAT_DECL)
372 enum tree_code code = TREE_CODE (node);
375 #ifdef ENABLE_CHECKING
376 if (code == STATEMENT_LIST)
380 length = tree_size (node);
381 t = ggc_alloc_zone_stat (length, tree_zone PASS_MEM_STAT);
382 memcpy (t, node, length);
385 TREE_ASM_WRITTEN (t) = 0;
386 TREE_VISITED (t) = 0;
389 if (TREE_CODE_CLASS (code) == 'd' && code != TRANSLATION_UNIT_DECL)
390 DECL_UID (t) = next_decl_uid++;
391 else if (TREE_CODE_CLASS (code) == 't')
393 TYPE_UID (t) = next_type_uid++;
394 /* The following is so that the debug code for
395 the copy is different from the original type.
396 The two statements usually duplicate each other
397 (because they clear fields of the same union),
398 but the optimizer should catch that. */
399 TYPE_SYMTAB_POINTER (t) = 0;
400 TYPE_SYMTAB_ADDRESS (t) = 0;
406 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
407 For example, this can copy a list made of TREE_LIST nodes. */
410 copy_list (tree list)
418 head = prev = copy_node (list);
419 next = TREE_CHAIN (list);
422 TREE_CHAIN (prev) = copy_node (next);
423 prev = TREE_CHAIN (prev);
424 next = TREE_CHAIN (next);
430 /* Return a newly constructed INTEGER_CST node whose constant value
431 is specified by the two ints LOW and HI.
432 The TREE_TYPE is set to `int'.
434 This function should be used via the `build_int_2' macro. */
437 build_int_2_wide (unsigned HOST_WIDE_INT low, HOST_WIDE_INT hi)
439 tree t = make_node (INTEGER_CST);
441 TREE_INT_CST_LOW (t) = low;
442 TREE_INT_CST_HIGH (t) = hi;
443 TREE_TYPE (t) = integer_type_node;
447 /* Return a new VECTOR_CST node whose type is TYPE and whose values
448 are in a list pointed by VALS. */
451 build_vector (tree type, tree vals)
453 tree v = make_node (VECTOR_CST);
454 int over1 = 0, over2 = 0;
457 TREE_VECTOR_CST_ELTS (v) = vals;
458 TREE_TYPE (v) = type;
460 /* Iterate through elements and check for overflow. */
461 for (link = vals; link; link = TREE_CHAIN (link))
463 tree value = TREE_VALUE (link);
465 over1 |= TREE_OVERFLOW (value);
466 over2 |= TREE_CONSTANT_OVERFLOW (value);
469 TREE_OVERFLOW (v) = over1;
470 TREE_CONSTANT_OVERFLOW (v) = over2;
475 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
476 are in a list pointed to by VALS. */
478 build_constructor (tree type, tree vals)
480 tree c = make_node (CONSTRUCTOR);
481 TREE_TYPE (c) = type;
482 CONSTRUCTOR_ELTS (c) = vals;
484 /* ??? May not be necessary. Mirrors what build does. */
487 TREE_SIDE_EFFECTS (c) = TREE_SIDE_EFFECTS (vals);
488 TREE_READONLY (c) = TREE_READONLY (vals);
489 TREE_CONSTANT (c) = TREE_CONSTANT (vals);
490 TREE_INVARIANT (c) = TREE_INVARIANT (vals);
496 /* Return a new REAL_CST node whose type is TYPE and value is D. */
499 build_real (tree type, REAL_VALUE_TYPE d)
505 /* ??? Used to check for overflow here via CHECK_FLOAT_TYPE.
506 Consider doing it via real_convert now. */
508 v = make_node (REAL_CST);
509 dp = ggc_alloc (sizeof (REAL_VALUE_TYPE));
510 memcpy (dp, &d, sizeof (REAL_VALUE_TYPE));
512 TREE_TYPE (v) = type;
513 TREE_REAL_CST_PTR (v) = dp;
514 TREE_OVERFLOW (v) = TREE_CONSTANT_OVERFLOW (v) = overflow;
518 /* Return a new REAL_CST node whose type is TYPE
519 and whose value is the integer value of the INTEGER_CST node I. */
522 real_value_from_int_cst (tree type, tree i)
526 /* Clear all bits of the real value type so that we can later do
527 bitwise comparisons to see if two values are the same. */
528 memset (&d, 0, sizeof d);
530 real_from_integer (&d, type ? TYPE_MODE (type) : VOIDmode,
531 TREE_INT_CST_LOW (i), TREE_INT_CST_HIGH (i),
532 TYPE_UNSIGNED (TREE_TYPE (i)));
536 /* Given a tree representing an integer constant I, return a tree
537 representing the same value as a floating-point constant of type TYPE. */
540 build_real_from_int_cst (tree type, tree i)
543 int overflow = TREE_OVERFLOW (i);
545 v = build_real (type, real_value_from_int_cst (type, i));
547 TREE_OVERFLOW (v) |= overflow;
548 TREE_CONSTANT_OVERFLOW (v) |= overflow;
552 /* Return a newly constructed STRING_CST node whose value is
553 the LEN characters at STR.
554 The TREE_TYPE is not initialized. */
557 build_string (int len, const char *str)
559 tree s = make_node (STRING_CST);
561 TREE_STRING_LENGTH (s) = len;
562 TREE_STRING_POINTER (s) = ggc_alloc_string (str, len);
567 /* Return a newly constructed COMPLEX_CST node whose value is
568 specified by the real and imaginary parts REAL and IMAG.
569 Both REAL and IMAG should be constant nodes. TYPE, if specified,
570 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
573 build_complex (tree type, tree real, tree imag)
575 tree t = make_node (COMPLEX_CST);
577 TREE_REALPART (t) = real;
578 TREE_IMAGPART (t) = imag;
579 TREE_TYPE (t) = type ? type : build_complex_type (TREE_TYPE (real));
580 TREE_OVERFLOW (t) = TREE_OVERFLOW (real) | TREE_OVERFLOW (imag);
581 TREE_CONSTANT_OVERFLOW (t)
582 = TREE_CONSTANT_OVERFLOW (real) | TREE_CONSTANT_OVERFLOW (imag);
586 /* Build a BINFO with LEN language slots. */
589 make_tree_binfo_stat (unsigned lang_slots MEM_STAT_DECL)
592 static unsigned length;
596 length = (offsetof (struct tree_binfo, lang_slots)
597 + (sizeof (((struct tree_binfo *)0)->lang_slots[0])
599 binfo_lang_slots = lang_slots;
601 else if (binfo_lang_slots != lang_slots)
604 #ifdef GATHER_STATISTICS
605 tree_node_counts[(int) binfo_kind]++;
606 tree_node_sizes[(int) binfo_kind] += length;
609 t = ggc_alloc_zone_stat (length, tree_zone PASS_MEM_STAT);
611 memset (t, 0, length);
613 TREE_SET_CODE (t, TREE_BINFO);
619 /* Build a newly constructed TREE_VEC node of length LEN. */
622 make_tree_vec_stat (int len MEM_STAT_DECL)
625 int length = (len - 1) * sizeof (tree) + sizeof (struct tree_vec);
627 #ifdef GATHER_STATISTICS
628 tree_node_counts[(int) vec_kind]++;
629 tree_node_sizes[(int) vec_kind] += length;
632 t = ggc_alloc_zone_stat (length, tree_zone PASS_MEM_STAT);
634 memset (t, 0, length);
636 TREE_SET_CODE (t, TREE_VEC);
637 TREE_VEC_LENGTH (t) = len;
642 /* Return 1 if EXPR is the integer constant zero or a complex constant
646 integer_zerop (tree expr)
650 return ((TREE_CODE (expr) == INTEGER_CST
651 && ! TREE_CONSTANT_OVERFLOW (expr)
652 && TREE_INT_CST_LOW (expr) == 0
653 && TREE_INT_CST_HIGH (expr) == 0)
654 || (TREE_CODE (expr) == COMPLEX_CST
655 && integer_zerop (TREE_REALPART (expr))
656 && integer_zerop (TREE_IMAGPART (expr))));
659 /* Return 1 if EXPR is the integer constant one or the corresponding
663 integer_onep (tree expr)
667 return ((TREE_CODE (expr) == INTEGER_CST
668 && ! TREE_CONSTANT_OVERFLOW (expr)
669 && TREE_INT_CST_LOW (expr) == 1
670 && TREE_INT_CST_HIGH (expr) == 0)
671 || (TREE_CODE (expr) == COMPLEX_CST
672 && integer_onep (TREE_REALPART (expr))
673 && integer_zerop (TREE_IMAGPART (expr))));
676 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
677 it contains. Likewise for the corresponding complex constant. */
680 integer_all_onesp (tree expr)
687 if (TREE_CODE (expr) == COMPLEX_CST
688 && integer_all_onesp (TREE_REALPART (expr))
689 && integer_zerop (TREE_IMAGPART (expr)))
692 else if (TREE_CODE (expr) != INTEGER_CST
693 || TREE_CONSTANT_OVERFLOW (expr))
696 uns = TYPE_UNSIGNED (TREE_TYPE (expr));
698 return (TREE_INT_CST_LOW (expr) == ~(unsigned HOST_WIDE_INT) 0
699 && TREE_INT_CST_HIGH (expr) == -1);
701 /* Note that using TYPE_PRECISION here is wrong. We care about the
702 actual bits, not the (arbitrary) range of the type. */
703 prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr)));
704 if (prec >= HOST_BITS_PER_WIDE_INT)
706 HOST_WIDE_INT high_value;
709 shift_amount = prec - HOST_BITS_PER_WIDE_INT;
711 if (shift_amount > HOST_BITS_PER_WIDE_INT)
712 /* Can not handle precisions greater than twice the host int size. */
714 else if (shift_amount == HOST_BITS_PER_WIDE_INT)
715 /* Shifting by the host word size is undefined according to the ANSI
716 standard, so we must handle this as a special case. */
719 high_value = ((HOST_WIDE_INT) 1 << shift_amount) - 1;
721 return (TREE_INT_CST_LOW (expr) == ~(unsigned HOST_WIDE_INT) 0
722 && TREE_INT_CST_HIGH (expr) == high_value);
725 return TREE_INT_CST_LOW (expr) == ((unsigned HOST_WIDE_INT) 1 << prec) - 1;
728 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
732 integer_pow2p (tree expr)
735 HOST_WIDE_INT high, low;
739 if (TREE_CODE (expr) == COMPLEX_CST
740 && integer_pow2p (TREE_REALPART (expr))
741 && integer_zerop (TREE_IMAGPART (expr)))
744 if (TREE_CODE (expr) != INTEGER_CST || TREE_CONSTANT_OVERFLOW (expr))
747 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
748 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
749 high = TREE_INT_CST_HIGH (expr);
750 low = TREE_INT_CST_LOW (expr);
752 /* First clear all bits that are beyond the type's precision in case
753 we've been sign extended. */
755 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
757 else if (prec > HOST_BITS_PER_WIDE_INT)
758 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
762 if (prec < HOST_BITS_PER_WIDE_INT)
763 low &= ~((HOST_WIDE_INT) (-1) << prec);
766 if (high == 0 && low == 0)
769 return ((high == 0 && (low & (low - 1)) == 0)
770 || (low == 0 && (high & (high - 1)) == 0));
773 /* Return 1 if EXPR is an integer constant other than zero or a
774 complex constant other than zero. */
777 integer_nonzerop (tree expr)
781 return ((TREE_CODE (expr) == INTEGER_CST
782 && ! TREE_CONSTANT_OVERFLOW (expr)
783 && (TREE_INT_CST_LOW (expr) != 0
784 || TREE_INT_CST_HIGH (expr) != 0))
785 || (TREE_CODE (expr) == COMPLEX_CST
786 && (integer_nonzerop (TREE_REALPART (expr))
787 || integer_nonzerop (TREE_IMAGPART (expr)))));
790 /* Return the power of two represented by a tree node known to be a
794 tree_log2 (tree expr)
797 HOST_WIDE_INT high, low;
801 if (TREE_CODE (expr) == COMPLEX_CST)
802 return tree_log2 (TREE_REALPART (expr));
804 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
805 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
807 high = TREE_INT_CST_HIGH (expr);
808 low = TREE_INT_CST_LOW (expr);
810 /* First clear all bits that are beyond the type's precision in case
811 we've been sign extended. */
813 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
815 else if (prec > HOST_BITS_PER_WIDE_INT)
816 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
820 if (prec < HOST_BITS_PER_WIDE_INT)
821 low &= ~((HOST_WIDE_INT) (-1) << prec);
824 return (high != 0 ? HOST_BITS_PER_WIDE_INT + exact_log2 (high)
828 /* Similar, but return the largest integer Y such that 2 ** Y is less
829 than or equal to EXPR. */
832 tree_floor_log2 (tree expr)
835 HOST_WIDE_INT high, low;
839 if (TREE_CODE (expr) == COMPLEX_CST)
840 return tree_log2 (TREE_REALPART (expr));
842 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
843 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
845 high = TREE_INT_CST_HIGH (expr);
846 low = TREE_INT_CST_LOW (expr);
848 /* First clear all bits that are beyond the type's precision in case
849 we've been sign extended. Ignore if type's precision hasn't been set
850 since what we are doing is setting it. */
852 if (prec == 2 * HOST_BITS_PER_WIDE_INT || prec == 0)
854 else if (prec > HOST_BITS_PER_WIDE_INT)
855 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
859 if (prec < HOST_BITS_PER_WIDE_INT)
860 low &= ~((HOST_WIDE_INT) (-1) << prec);
863 return (high != 0 ? HOST_BITS_PER_WIDE_INT + floor_log2 (high)
867 /* Return 1 if EXPR is the real constant zero. */
870 real_zerop (tree expr)
874 return ((TREE_CODE (expr) == REAL_CST
875 && ! TREE_CONSTANT_OVERFLOW (expr)
876 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst0))
877 || (TREE_CODE (expr) == COMPLEX_CST
878 && real_zerop (TREE_REALPART (expr))
879 && real_zerop (TREE_IMAGPART (expr))));
882 /* Return 1 if EXPR is the real constant one in real or complex form. */
885 real_onep (tree expr)
889 return ((TREE_CODE (expr) == REAL_CST
890 && ! TREE_CONSTANT_OVERFLOW (expr)
891 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst1))
892 || (TREE_CODE (expr) == COMPLEX_CST
893 && real_onep (TREE_REALPART (expr))
894 && real_zerop (TREE_IMAGPART (expr))));
897 /* Return 1 if EXPR is the real constant two. */
900 real_twop (tree expr)
904 return ((TREE_CODE (expr) == REAL_CST
905 && ! TREE_CONSTANT_OVERFLOW (expr)
906 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst2))
907 || (TREE_CODE (expr) == COMPLEX_CST
908 && real_twop (TREE_REALPART (expr))
909 && real_zerop (TREE_IMAGPART (expr))));
912 /* Return 1 if EXPR is the real constant minus one. */
915 real_minus_onep (tree expr)
919 return ((TREE_CODE (expr) == REAL_CST
920 && ! TREE_CONSTANT_OVERFLOW (expr)
921 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconstm1))
922 || (TREE_CODE (expr) == COMPLEX_CST
923 && real_minus_onep (TREE_REALPART (expr))
924 && real_zerop (TREE_IMAGPART (expr))));
927 /* Nonzero if EXP is a constant or a cast of a constant. */
930 really_constant_p (tree exp)
932 /* This is not quite the same as STRIP_NOPS. It does more. */
933 while (TREE_CODE (exp) == NOP_EXPR
934 || TREE_CODE (exp) == CONVERT_EXPR
935 || TREE_CODE (exp) == NON_LVALUE_EXPR)
936 exp = TREE_OPERAND (exp, 0);
937 return TREE_CONSTANT (exp);
940 /* Return first list element whose TREE_VALUE is ELEM.
941 Return 0 if ELEM is not in LIST. */
944 value_member (tree elem, tree list)
948 if (elem == TREE_VALUE (list))
950 list = TREE_CHAIN (list);
955 /* Return first list element whose TREE_PURPOSE is ELEM.
956 Return 0 if ELEM is not in LIST. */
959 purpose_member (tree elem, tree list)
963 if (elem == TREE_PURPOSE (list))
965 list = TREE_CHAIN (list);
970 /* Return first list element whose BINFO_TYPE is ELEM.
971 Return 0 if ELEM is not in LIST. */
974 binfo_member (tree elem, tree list)
978 if (elem == BINFO_TYPE (list))
980 list = TREE_CHAIN (list);
985 /* Return nonzero if ELEM is part of the chain CHAIN. */
988 chain_member (tree elem, tree chain)
994 chain = TREE_CHAIN (chain);
1000 /* Return the length of a chain of nodes chained through TREE_CHAIN.
1001 We expect a null pointer to mark the end of the chain.
1002 This is the Lisp primitive `length'. */
1005 list_length (tree t)
1008 #ifdef ENABLE_TREE_CHECKING
1016 #ifdef ENABLE_TREE_CHECKING
1028 /* Returns the number of FIELD_DECLs in TYPE. */
1031 fields_length (tree type)
1033 tree t = TYPE_FIELDS (type);
1036 for (; t; t = TREE_CHAIN (t))
1037 if (TREE_CODE (t) == FIELD_DECL)
1043 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
1044 by modifying the last node in chain 1 to point to chain 2.
1045 This is the Lisp primitive `nconc'. */
1048 chainon (tree op1, tree op2)
1057 for (t1 = op1; TREE_CHAIN (t1); t1 = TREE_CHAIN (t1))
1059 TREE_CHAIN (t1) = op2;
1061 #ifdef ENABLE_TREE_CHECKING
1064 for (t2 = op2; t2; t2 = TREE_CHAIN (t2))
1066 abort (); /* Circularity created. */
1073 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
1076 tree_last (tree chain)
1080 while ((next = TREE_CHAIN (chain)))
1085 /* Reverse the order of elements in the chain T,
1086 and return the new head of the chain (old last element). */
1091 tree prev = 0, decl, next;
1092 for (decl = t; decl; decl = next)
1094 next = TREE_CHAIN (decl);
1095 TREE_CHAIN (decl) = prev;
1101 /* Return a newly created TREE_LIST node whose
1102 purpose and value fields are PARM and VALUE. */
1105 build_tree_list_stat (tree parm, tree value MEM_STAT_DECL)
1107 tree t = make_node_stat (TREE_LIST PASS_MEM_STAT);
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 PURPOSE and VALUE
1115 and whose TREE_CHAIN is CHAIN. */
1118 tree_cons_stat (tree purpose, tree value, tree chain MEM_STAT_DECL)
1122 node = ggc_alloc_zone_stat (sizeof (struct tree_list),
1123 tree_zone PASS_MEM_STAT);
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 (tree type)
1151 if (type == error_mark_node)
1152 return integer_zero_node;
1154 type = TYPE_MAIN_VARIANT (type);
1155 t = TYPE_SIZE_UNIT (type);
1159 lang_hooks.types.incomplete_type_error (NULL_TREE, type);
1160 return size_zero_node;
1163 if (TREE_CODE (t) == INTEGER_CST)
1164 force_fit_type (t, 0);
1169 /* Return the size of TYPE (in bytes) as a wide integer
1170 or return -1 if the size can vary or is larger than an integer. */
1173 int_size_in_bytes (tree type)
1177 if (type == error_mark_node)
1180 type = TYPE_MAIN_VARIANT (type);
1181 t = TYPE_SIZE_UNIT (type);
1183 || TREE_CODE (t) != INTEGER_CST
1184 || TREE_OVERFLOW (t)
1185 || TREE_INT_CST_HIGH (t) != 0
1186 /* If the result would appear negative, it's too big to represent. */
1187 || (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0)
1190 return TREE_INT_CST_LOW (t);
1193 /* Return the bit position of FIELD, in bits from the start of the record.
1194 This is a tree of type bitsizetype. */
1197 bit_position (tree field)
1199 return bit_from_pos (DECL_FIELD_OFFSET (field),
1200 DECL_FIELD_BIT_OFFSET (field));
1203 /* Likewise, but return as an integer. Abort if it cannot be represented
1204 in that way (since it could be a signed value, we don't have the option
1205 of returning -1 like int_size_in_byte can. */
1208 int_bit_position (tree field)
1210 return tree_low_cst (bit_position (field), 0);
1213 /* Return the byte position of FIELD, in bytes from the start of the record.
1214 This is a tree of type sizetype. */
1217 byte_position (tree field)
1219 return byte_from_pos (DECL_FIELD_OFFSET (field),
1220 DECL_FIELD_BIT_OFFSET (field));
1223 /* Likewise, but return as an integer. Abort if it cannot be represented
1224 in that way (since it could be a signed value, we don't have the option
1225 of returning -1 like int_size_in_byte can. */
1228 int_byte_position (tree field)
1230 return tree_low_cst (byte_position (field), 0);
1233 /* Return the strictest alignment, in bits, that T is known to have. */
1238 unsigned int align0, align1;
1240 switch (TREE_CODE (t))
1242 case NOP_EXPR: case CONVERT_EXPR: case NON_LVALUE_EXPR:
1243 /* If we have conversions, we know that the alignment of the
1244 object must meet each of the alignments of the types. */
1245 align0 = expr_align (TREE_OPERAND (t, 0));
1246 align1 = TYPE_ALIGN (TREE_TYPE (t));
1247 return MAX (align0, align1);
1249 case SAVE_EXPR: case COMPOUND_EXPR: case MODIFY_EXPR:
1250 case INIT_EXPR: case TARGET_EXPR: case WITH_CLEANUP_EXPR:
1251 case CLEANUP_POINT_EXPR: case UNSAVE_EXPR:
1252 /* These don't change the alignment of an object. */
1253 return expr_align (TREE_OPERAND (t, 0));
1256 /* The best we can do is say that the alignment is the least aligned
1258 align0 = expr_align (TREE_OPERAND (t, 1));
1259 align1 = expr_align (TREE_OPERAND (t, 2));
1260 return MIN (align0, align1);
1262 case LABEL_DECL: case CONST_DECL:
1263 case VAR_DECL: case PARM_DECL: case RESULT_DECL:
1264 if (DECL_ALIGN (t) != 0)
1265 return DECL_ALIGN (t);
1269 return FUNCTION_BOUNDARY;
1275 /* Otherwise take the alignment from that of the type. */
1276 return TYPE_ALIGN (TREE_TYPE (t));
1279 /* Return, as a tree node, the number of elements for TYPE (which is an
1280 ARRAY_TYPE) minus one. This counts only elements of the top array. */
1283 array_type_nelts (tree type)
1285 tree index_type, min, max;
1287 /* If they did it with unspecified bounds, then we should have already
1288 given an error about it before we got here. */
1289 if (! TYPE_DOMAIN (type))
1290 return error_mark_node;
1292 index_type = TYPE_DOMAIN (type);
1293 min = TYPE_MIN_VALUE (index_type);
1294 max = TYPE_MAX_VALUE (index_type);
1296 return (integer_zerop (min)
1298 : fold (build2 (MINUS_EXPR, TREE_TYPE (max), max, min)));
1301 /* Return nonzero if arg is static -- a reference to an object in
1302 static storage. This is not the same as the C meaning of `static'. */
1307 switch (TREE_CODE (arg))
1310 /* Nested functions aren't static, since taking their address
1311 involves a trampoline. */
1312 return ((decl_function_context (arg) == 0 || DECL_NO_STATIC_CHAIN (arg))
1313 && ! DECL_NON_ADDR_CONST_P (arg));
1316 return ((TREE_STATIC (arg) || DECL_EXTERNAL (arg))
1317 && ! DECL_THREAD_LOCAL (arg)
1318 && ! DECL_NON_ADDR_CONST_P (arg));
1321 return TREE_STATIC (arg);
1328 /* If the thing being referenced is not a field, then it is
1329 something language specific. */
1330 if (TREE_CODE (TREE_OPERAND (arg, 1)) != FIELD_DECL)
1331 return (*lang_hooks.staticp) (arg);
1333 /* If we are referencing a bitfield, we can't evaluate an
1334 ADDR_EXPR at compile time and so it isn't a constant. */
1335 if (DECL_BIT_FIELD (TREE_OPERAND (arg, 1)))
1338 return staticp (TREE_OPERAND (arg, 0));
1344 /* This case is technically correct, but results in setting
1345 TREE_CONSTANT on ADDR_EXPRs that cannot be evaluated at
1348 return TREE_CONSTANT (TREE_OPERAND (arg, 0));
1352 case ARRAY_RANGE_REF:
1353 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg))) == INTEGER_CST
1354 && TREE_CODE (TREE_OPERAND (arg, 1)) == INTEGER_CST)
1355 return staticp (TREE_OPERAND (arg, 0));
1360 if ((unsigned int) TREE_CODE (arg)
1361 >= (unsigned int) LAST_AND_UNUSED_TREE_CODE)
1362 return lang_hooks.staticp (arg);
1368 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
1369 Do this to any expression which may be used in more than one place,
1370 but must be evaluated only once.
1372 Normally, expand_expr would reevaluate the expression each time.
1373 Calling save_expr produces something that is evaluated and recorded
1374 the first time expand_expr is called on it. Subsequent calls to
1375 expand_expr just reuse the recorded value.
1377 The call to expand_expr that generates code that actually computes
1378 the value is the first call *at compile time*. Subsequent calls
1379 *at compile time* generate code to use the saved value.
1380 This produces correct result provided that *at run time* control
1381 always flows through the insns made by the first expand_expr
1382 before reaching the other places where the save_expr was evaluated.
1383 You, the caller of save_expr, must make sure this is so.
1385 Constants, and certain read-only nodes, are returned with no
1386 SAVE_EXPR because that is safe. Expressions containing placeholders
1387 are not touched; see tree.def for an explanation of what these
1391 save_expr (tree expr)
1393 tree t = fold (expr);
1396 /* If the tree evaluates to a constant, then we don't want to hide that
1397 fact (i.e. this allows further folding, and direct checks for constants).
1398 However, a read-only object that has side effects cannot be bypassed.
1399 Since it is no problem to reevaluate literals, we just return the
1401 inner = skip_simple_arithmetic (t);
1403 if (TREE_INVARIANT (inner)
1404 || (TREE_READONLY (inner) && ! TREE_SIDE_EFFECTS (inner))
1405 || TREE_CODE (inner) == SAVE_EXPR
1406 || TREE_CODE (inner) == ERROR_MARK)
1409 /* If INNER contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
1410 it means that the size or offset of some field of an object depends on
1411 the value within another field.
1413 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
1414 and some variable since it would then need to be both evaluated once and
1415 evaluated more than once. Front-ends must assure this case cannot
1416 happen by surrounding any such subexpressions in their own SAVE_EXPR
1417 and forcing evaluation at the proper time. */
1418 if (contains_placeholder_p (inner))
1421 t = build1 (SAVE_EXPR, TREE_TYPE (expr), t);
1423 /* This expression might be placed ahead of a jump to ensure that the
1424 value was computed on both sides of the jump. So make sure it isn't
1425 eliminated as dead. */
1426 TREE_SIDE_EFFECTS (t) = 1;
1427 TREE_READONLY (t) = 1;
1428 TREE_INVARIANT (t) = 1;
1432 /* Look inside EXPR and into any simple arithmetic operations. Return
1433 the innermost non-arithmetic node. */
1436 skip_simple_arithmetic (tree expr)
1440 /* We don't care about whether this can be used as an lvalue in this
1442 while (TREE_CODE (expr) == NON_LVALUE_EXPR)
1443 expr = TREE_OPERAND (expr, 0);
1445 /* If we have simple operations applied to a SAVE_EXPR or to a SAVE_EXPR and
1446 a constant, it will be more efficient to not make another SAVE_EXPR since
1447 it will allow better simplification and GCSE will be able to merge the
1448 computations if they actually occur. */
1452 if (TREE_CODE_CLASS (TREE_CODE (inner)) == '1')
1453 inner = TREE_OPERAND (inner, 0);
1454 else if (TREE_CODE_CLASS (TREE_CODE (inner)) == '2')
1456 if (TREE_INVARIANT (TREE_OPERAND (inner, 1)))
1457 inner = TREE_OPERAND (inner, 0);
1458 else if (TREE_INVARIANT (TREE_OPERAND (inner, 0)))
1459 inner = TREE_OPERAND (inner, 1);
1470 /* Arrange for an expression to be expanded multiple independent
1471 times. This is useful for cleanup actions, as the backend can
1472 expand them multiple times in different places. */
1475 unsave_expr (tree expr)
1479 /* If this is already protected, no sense in protecting it again. */
1480 if (TREE_CODE (expr) == UNSAVE_EXPR)
1483 t = build1 (UNSAVE_EXPR, TREE_TYPE (expr), expr);
1484 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (expr);
1488 /* Returns the index of the first non-tree operand for CODE, or the number
1489 of operands if all are trees. */
1492 first_rtl_op (enum tree_code code)
1497 return TREE_CODE_LENGTH (code);
1501 /* Return which tree structure is used by T. */
1503 enum tree_node_structure_enum
1504 tree_node_structure (tree t)
1506 enum tree_code code = TREE_CODE (t);
1508 switch (TREE_CODE_CLASS (code))
1510 case 'd': return TS_DECL;
1511 case 't': return TS_TYPE;
1512 case 'r': case '<': case '1': case '2': case 'e': case 's':
1514 default: /* 'c' and 'x' */
1520 case INTEGER_CST: return TS_INT_CST;
1521 case REAL_CST: return TS_REAL_CST;
1522 case COMPLEX_CST: return TS_COMPLEX;
1523 case VECTOR_CST: return TS_VECTOR;
1524 case STRING_CST: return TS_STRING;
1526 case ERROR_MARK: return TS_COMMON;
1527 case IDENTIFIER_NODE: return TS_IDENTIFIER;
1528 case TREE_LIST: return TS_LIST;
1529 case TREE_VEC: return TS_VEC;
1530 case PHI_NODE: return TS_PHI_NODE;
1531 case SSA_NAME: return TS_SSA_NAME;
1532 case PLACEHOLDER_EXPR: return TS_COMMON;
1533 case STATEMENT_LIST: return TS_STATEMENT_LIST;
1534 case BLOCK: return TS_BLOCK;
1535 case TREE_BINFO: return TS_BINFO;
1536 case VALUE_HANDLE: return TS_VALUE_HANDLE;
1543 /* Perform any modifications to EXPR required when it is unsaved. Does
1544 not recurse into EXPR's subtrees. */
1547 unsave_expr_1 (tree expr)
1549 switch (TREE_CODE (expr))
1552 /* Don't mess with a TARGET_EXPR that hasn't been expanded.
1553 It's OK for this to happen if it was part of a subtree that
1554 isn't immediately expanded, such as operand 2 of another
1556 if (TREE_OPERAND (expr, 1))
1559 TREE_OPERAND (expr, 1) = TREE_OPERAND (expr, 3);
1560 TREE_OPERAND (expr, 3) = NULL_TREE;
1568 /* Return 0 if it is safe to evaluate EXPR multiple times,
1569 return 1 if it is safe if EXPR is unsaved afterward, or
1570 return 2 if it is completely unsafe.
1572 This assumes that CALL_EXPRs and TARGET_EXPRs are never replicated in
1573 an expression tree, so that it safe to unsave them and the surrounding
1574 context will be correct.
1576 SAVE_EXPRs basically *only* appear replicated in an expression tree,
1577 occasionally across the whole of a function. It is therefore only
1578 safe to unsave a SAVE_EXPR if you know that all occurrences appear
1579 below the UNSAVE_EXPR. */
1582 unsafe_for_reeval (tree expr)
1585 enum tree_code code;
1590 if (expr == NULL_TREE)
1593 code = TREE_CODE (expr);
1594 first_rtl = first_rtl_op (code);
1601 /* A label can only be emitted once. */
1610 for (exp = expr; exp != 0; exp = TREE_CHAIN (exp))
1612 tmp = unsafe_for_reeval (TREE_VALUE (exp));
1613 unsafeness = MAX (tmp, unsafeness);
1619 tmp2 = unsafe_for_reeval (TREE_OPERAND (expr, 0));
1620 tmp = unsafe_for_reeval (TREE_OPERAND (expr, 1));
1621 return MAX (MAX (tmp, 1), tmp2);
1627 case EXIT_BLOCK_EXPR:
1628 /* EXIT_BLOCK_LABELED_BLOCK, a.k.a. TREE_OPERAND (expr, 0), holds
1629 a reference to an ancestor LABELED_BLOCK, so we need to avoid
1630 unbounded recursion in the 'e' traversal code below. */
1631 exp = EXIT_BLOCK_RETURN (expr);
1632 return exp ? unsafe_for_reeval (exp) : 0;
1635 tmp = lang_hooks.unsafe_for_reeval (expr);
1641 switch (TREE_CODE_CLASS (code))
1643 case 'c': /* a constant */
1644 case 't': /* a type node */
1645 case 'x': /* something random, like an identifier or an ERROR_MARK. */
1646 case 'd': /* A decl node */
1649 case 'e': /* an expression */
1650 case 'r': /* a reference */
1651 case 's': /* an expression with side effects */
1652 case '<': /* a comparison expression */
1653 case '2': /* a binary arithmetic expression */
1654 case '1': /* a unary arithmetic expression */
1655 for (i = first_rtl - 1; i >= 0; i--)
1657 tmp = unsafe_for_reeval (TREE_OPERAND (expr, i));
1658 unsafeness = MAX (tmp, unsafeness);
1668 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
1669 or offset that depends on a field within a record. */
1672 contains_placeholder_p (tree exp)
1674 enum tree_code code;
1679 code = TREE_CODE (exp);
1680 if (code == PLACEHOLDER_EXPR)
1683 switch (TREE_CODE_CLASS (code))
1686 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
1687 position computations since they will be converted into a
1688 WITH_RECORD_EXPR involving the reference, which will assume
1689 here will be valid. */
1690 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));
1693 if (code == TREE_LIST)
1694 return (CONTAINS_PLACEHOLDER_P (TREE_VALUE (exp))
1695 || CONTAINS_PLACEHOLDER_P (TREE_CHAIN (exp)));
1704 /* Ignoring the first operand isn't quite right, but works best. */
1705 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1));
1708 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0))
1709 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1))
1710 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 2)));
1716 switch (first_rtl_op (code))
1719 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));
1721 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0))
1722 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1)));
1733 /* Return 1 if any part of the computation of TYPE involves a PLACEHOLDER_EXPR.
1734 This includes size, bounds, qualifiers (for QUAL_UNION_TYPE) and field
1738 type_contains_placeholder_p (tree type)
1740 /* If the size contains a placeholder or the parent type (component type in
1741 the case of arrays) type involves a placeholder, this type does. */
1742 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type))
1743 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (type))
1744 || (TREE_TYPE (type) != 0
1745 && type_contains_placeholder_p (TREE_TYPE (type))))
1748 /* Now do type-specific checks. Note that the last part of the check above
1749 greatly limits what we have to do below. */
1750 switch (TREE_CODE (type))
1759 case REFERENCE_TYPE:
1767 /* Here we just check the bounds. */
1768 return (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (type))
1769 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (type)));
1774 /* We're already checked the component type (TREE_TYPE), so just check
1776 return type_contains_placeholder_p (TYPE_DOMAIN (type));
1780 case QUAL_UNION_TYPE:
1782 static tree seen_types = 0;
1786 /* We have to be careful here that we don't end up in infinite
1787 recursions due to a field of a type being a pointer to that type
1788 or to a mutually-recursive type. So we store a list of record
1789 types that we've seen and see if this type is in them. To save
1790 memory, we don't use a list for just one type. Here we check
1791 whether we've seen this type before and store it if not. */
1792 if (seen_types == 0)
1794 else if (TREE_CODE (seen_types) != TREE_LIST)
1796 if (seen_types == type)
1799 seen_types = tree_cons (NULL_TREE, type,
1800 build_tree_list (NULL_TREE, seen_types));
1804 if (value_member (type, seen_types) != 0)
1807 seen_types = tree_cons (NULL_TREE, type, seen_types);
1810 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
1811 if (TREE_CODE (field) == FIELD_DECL
1812 && (CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (field))
1813 || (TREE_CODE (type) == QUAL_UNION_TYPE
1814 && CONTAINS_PLACEHOLDER_P (DECL_QUALIFIER (field)))
1815 || type_contains_placeholder_p (TREE_TYPE (field))))
1821 /* Now remove us from seen_types and return the result. */
1822 if (seen_types == type)
1825 seen_types = TREE_CHAIN (seen_types);
1835 /* Return 1 if EXP contains any expressions that produce cleanups for an
1836 outer scope to deal with. Used by fold. */
1839 has_cleanups (tree exp)
1843 if (! TREE_SIDE_EFFECTS (exp))
1846 switch (TREE_CODE (exp))
1849 case WITH_CLEANUP_EXPR:
1852 case CLEANUP_POINT_EXPR:
1856 for (exp = TREE_OPERAND (exp, 1); exp; exp = TREE_CHAIN (exp))
1858 cmp = has_cleanups (TREE_VALUE (exp));
1865 return (DECL_INITIAL (DECL_EXPR_DECL (exp))
1866 && has_cleanups (DECL_INITIAL (DECL_EXPR_DECL (exp))));
1872 /* This general rule works for most tree codes. All exceptions should be
1873 handled above. If this is a language-specific tree code, we can't
1874 trust what might be in the operand, so say we don't know
1876 if ((int) TREE_CODE (exp) >= (int) LAST_AND_UNUSED_TREE_CODE)
1879 nops = first_rtl_op (TREE_CODE (exp));
1880 for (i = 0; i < nops; i++)
1881 if (TREE_OPERAND (exp, i) != 0)
1883 int type = TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp, i)));
1884 if (type == 'e' || type == '<' || type == '1' || type == '2'
1885 || type == 'r' || type == 's')
1887 cmp = has_cleanups (TREE_OPERAND (exp, i));
1896 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
1897 return a tree with all occurrences of references to F in a
1898 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
1899 contains only arithmetic expressions or a CALL_EXPR with a
1900 PLACEHOLDER_EXPR occurring only in its arglist. */
1903 substitute_in_expr (tree exp, tree f, tree r)
1905 enum tree_code code = TREE_CODE (exp);
1910 /* We handle TREE_LIST and COMPONENT_REF separately. */
1911 if (code == TREE_LIST)
1913 op0 = SUBSTITUTE_IN_EXPR (TREE_CHAIN (exp), f, r);
1914 op1 = SUBSTITUTE_IN_EXPR (TREE_VALUE (exp), f, r);
1915 if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
1918 return tree_cons (TREE_PURPOSE (exp), op1, op0);
1920 else if (code == COMPONENT_REF)
1922 /* If this expression is getting a value from a PLACEHOLDER_EXPR
1923 and it is the right field, replace it with R. */
1924 for (inner = TREE_OPERAND (exp, 0);
1925 TREE_CODE_CLASS (TREE_CODE (inner)) == 'r';
1926 inner = TREE_OPERAND (inner, 0))
1928 if (TREE_CODE (inner) == PLACEHOLDER_EXPR
1929 && TREE_OPERAND (exp, 1) == f)
1932 /* If this expression hasn't been completed let, leave it
1934 if (TREE_CODE (inner) == PLACEHOLDER_EXPR && TREE_TYPE (inner) == 0)
1937 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
1938 if (op0 == TREE_OPERAND (exp, 0))
1941 new = fold (build (code, TREE_TYPE (exp), op0, TREE_OPERAND (exp, 1),
1945 switch (TREE_CODE_CLASS (code))
1957 switch (first_rtl_op (code))
1963 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
1964 if (op0 == TREE_OPERAND (exp, 0))
1967 new = fold (build1 (code, TREE_TYPE (exp), op0));
1971 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
1972 op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
1974 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
1977 new = fold (build2 (code, TREE_TYPE (exp), op0, op1));
1981 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
1982 op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
1983 op2 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 2), f, r);
1985 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
1986 && op2 == TREE_OPERAND (exp, 2))
1989 new = fold (build3 (code, TREE_TYPE (exp), op0, op1, op2));
2001 TREE_READONLY (new) = TREE_READONLY (exp);
2005 /* Similar, but look for a PLACEHOLDER_EXPR in EXP and find a replacement
2006 for it within OBJ, a tree that is an object or a chain of references. */
2009 substitute_placeholder_in_expr (tree exp, tree obj)
2011 enum tree_code code = TREE_CODE (exp);
2012 tree op0, op1, op2, op3;
2014 /* If this is a PLACEHOLDER_EXPR, see if we find a corresponding type
2015 in the chain of OBJ. */
2016 if (code == PLACEHOLDER_EXPR)
2018 tree need_type = TYPE_MAIN_VARIANT (TREE_TYPE (exp));
2021 for (elt = obj; elt != 0;
2022 elt = ((TREE_CODE (elt) == COMPOUND_EXPR
2023 || TREE_CODE (elt) == COND_EXPR)
2024 ? TREE_OPERAND (elt, 1)
2025 : (TREE_CODE_CLASS (TREE_CODE (elt)) == 'r'
2026 || TREE_CODE_CLASS (TREE_CODE (elt)) == '1'
2027 || TREE_CODE_CLASS (TREE_CODE (elt)) == '2'
2028 || TREE_CODE_CLASS (TREE_CODE (elt)) == 'e')
2029 ? TREE_OPERAND (elt, 0) : 0))
2030 if (TYPE_MAIN_VARIANT (TREE_TYPE (elt)) == need_type)
2033 for (elt = obj; elt != 0;
2034 elt = ((TREE_CODE (elt) == COMPOUND_EXPR
2035 || TREE_CODE (elt) == COND_EXPR)
2036 ? TREE_OPERAND (elt, 1)
2037 : (TREE_CODE_CLASS (TREE_CODE (elt)) == 'r'
2038 || TREE_CODE_CLASS (TREE_CODE (elt)) == '1'
2039 || TREE_CODE_CLASS (TREE_CODE (elt)) == '2'
2040 || TREE_CODE_CLASS (TREE_CODE (elt)) == 'e')
2041 ? TREE_OPERAND (elt, 0) : 0))
2042 if (POINTER_TYPE_P (TREE_TYPE (elt))
2043 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (elt)))
2045 return fold (build1 (INDIRECT_REF, need_type, elt));
2047 /* If we didn't find it, return the original PLACEHOLDER_EXPR. If it
2048 survives until RTL generation, there will be an error. */
2052 /* TREE_LIST is special because we need to look at TREE_VALUE
2053 and TREE_CHAIN, not TREE_OPERANDS. */
2054 else if (code == TREE_LIST)
2056 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp), obj);
2057 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp), obj);
2058 if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
2061 return tree_cons (TREE_PURPOSE (exp), op1, op0);
2064 switch (TREE_CODE_CLASS (code))
2077 switch (first_rtl_op (code))
2083 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
2084 if (op0 == TREE_OPERAND (exp, 0))
2087 return fold (build1 (code, TREE_TYPE (exp), op0));
2090 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
2091 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
2093 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
2096 return fold (build2 (code, TREE_TYPE (exp), op0, op1));
2099 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
2100 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
2101 op2 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 2), obj);
2103 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
2104 && op2 == TREE_OPERAND (exp, 2))
2107 return fold (build3 (code, TREE_TYPE (exp), op0, op1, op2));
2110 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
2111 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
2112 op2 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 2), obj);
2113 op3 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 3), obj);
2115 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
2116 && op2 == TREE_OPERAND (exp, 2)
2117 && op3 == TREE_OPERAND (exp, 3))
2120 return fold (build4 (code, TREE_TYPE (exp), op0, op1, op2, op3));
2132 /* Stabilize a reference so that we can use it any number of times
2133 without causing its operands to be evaluated more than once.
2134 Returns the stabilized reference. This works by means of save_expr,
2135 so see the caveats in the comments about save_expr.
2137 Also allows conversion expressions whose operands are references.
2138 Any other kind of expression is returned unchanged. */
2141 stabilize_reference (tree ref)
2144 enum tree_code code = TREE_CODE (ref);
2151 /* No action is needed in this case. */
2157 case FIX_TRUNC_EXPR:
2158 case FIX_FLOOR_EXPR:
2159 case FIX_ROUND_EXPR:
2161 result = build_nt (code, stabilize_reference (TREE_OPERAND (ref, 0)));
2165 result = build_nt (INDIRECT_REF,
2166 stabilize_reference_1 (TREE_OPERAND (ref, 0)));
2170 result = build_nt (COMPONENT_REF,
2171 stabilize_reference (TREE_OPERAND (ref, 0)),
2172 TREE_OPERAND (ref, 1), NULL_TREE);
2176 result = build_nt (BIT_FIELD_REF,
2177 stabilize_reference (TREE_OPERAND (ref, 0)),
2178 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
2179 stabilize_reference_1 (TREE_OPERAND (ref, 2)));
2183 result = build_nt (ARRAY_REF,
2184 stabilize_reference (TREE_OPERAND (ref, 0)),
2185 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
2186 TREE_OPERAND (ref, 2), TREE_OPERAND (ref, 3));
2189 case ARRAY_RANGE_REF:
2190 result = build_nt (ARRAY_RANGE_REF,
2191 stabilize_reference (TREE_OPERAND (ref, 0)),
2192 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
2193 TREE_OPERAND (ref, 2), TREE_OPERAND (ref, 3));
2197 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2198 it wouldn't be ignored. This matters when dealing with
2200 return stabilize_reference_1 (ref);
2202 /* If arg isn't a kind of lvalue we recognize, make no change.
2203 Caller should recognize the error for an invalid lvalue. */
2208 return error_mark_node;
2211 TREE_TYPE (result) = TREE_TYPE (ref);
2212 TREE_READONLY (result) = TREE_READONLY (ref);
2213 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (ref);
2214 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);
2219 /* Subroutine of stabilize_reference; this is called for subtrees of
2220 references. Any expression with side-effects must be put in a SAVE_EXPR
2221 to ensure that it is only evaluated once.
2223 We don't put SAVE_EXPR nodes around everything, because assigning very
2224 simple expressions to temporaries causes us to miss good opportunities
2225 for optimizations. Among other things, the opportunity to fold in the
2226 addition of a constant into an addressing mode often gets lost, e.g.
2227 "y[i+1] += x;". In general, we take the approach that we should not make
2228 an assignment unless we are forced into it - i.e., that any non-side effect
2229 operator should be allowed, and that cse should take care of coalescing
2230 multiple utterances of the same expression should that prove fruitful. */
2233 stabilize_reference_1 (tree e)
2236 enum tree_code code = TREE_CODE (e);
2238 /* We cannot ignore const expressions because it might be a reference
2239 to a const array but whose index contains side-effects. But we can
2240 ignore things that are actual constant or that already have been
2241 handled by this function. */
2243 if (TREE_INVARIANT (e))
2246 switch (TREE_CODE_CLASS (code))
2255 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2256 so that it will only be evaluated once. */
2257 /* The reference (r) and comparison (<) classes could be handled as
2258 below, but it is generally faster to only evaluate them once. */
2259 if (TREE_SIDE_EFFECTS (e))
2260 return save_expr (e);
2264 /* Constants need no processing. In fact, we should never reach
2269 /* Division is slow and tends to be compiled with jumps,
2270 especially the division by powers of 2 that is often
2271 found inside of an array reference. So do it just once. */
2272 if (code == TRUNC_DIV_EXPR || code == TRUNC_MOD_EXPR
2273 || code == FLOOR_DIV_EXPR || code == FLOOR_MOD_EXPR
2274 || code == CEIL_DIV_EXPR || code == CEIL_MOD_EXPR
2275 || code == ROUND_DIV_EXPR || code == ROUND_MOD_EXPR)
2276 return save_expr (e);
2277 /* Recursively stabilize each operand. */
2278 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)),
2279 stabilize_reference_1 (TREE_OPERAND (e, 1)));
2283 /* Recursively stabilize each operand. */
2284 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)));
2291 TREE_TYPE (result) = TREE_TYPE (e);
2292 TREE_READONLY (result) = TREE_READONLY (e);
2293 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (e);
2294 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);
2295 TREE_INVARIANT (result) = 1;
2300 /* Low-level constructors for expressions. */
2302 /* A helper function for build1 and constant folders. Set TREE_CONSTANT,
2303 TREE_INVARIANT, and TREE_SIDE_EFFECTS for an ADDR_EXPR. */
2306 recompute_tree_invarant_for_addr_expr (tree t)
2309 bool tc = true, ti = true, se = false;
2311 /* We started out assuming this address is both invariant and constant, but
2312 does not have side effects. Now go down any handled components and see if
2313 any of them involve offsets that are either non-constant or non-invariant.
2314 Also check for side-effects.
2316 ??? Note that this code makes no attempt to deal with the case where
2317 taking the address of something causes a copy due to misalignment. */
2319 #define UPDATE_TITCSE(NODE) \
2320 do { tree _node = (NODE); \
2321 if (_node && !TREE_INVARIANT (_node)) ti = false; \
2322 if (_node && !TREE_CONSTANT (_node)) tc = false; \
2323 if (_node && TREE_SIDE_EFFECTS (_node)) se = true; } while (0)
2325 for (node = TREE_OPERAND (t, 0); handled_component_p (node);
2326 node = TREE_OPERAND (node, 0))
2328 /* If the first operand doesn't have an ARRAY_TYPE, this is a bogus
2329 array reference (probably made temporarily by the G++ front end),
2330 so ignore all the operands. */
2331 if ((TREE_CODE (node) == ARRAY_REF
2332 || TREE_CODE (node) == ARRAY_RANGE_REF)
2333 && TREE_CODE (TREE_TYPE (TREE_OPERAND (node, 0))) == ARRAY_TYPE)
2335 UPDATE_TITCSE (TREE_OPERAND (node, 1));
2336 UPDATE_TITCSE (array_ref_low_bound (node));
2337 UPDATE_TITCSE (array_ref_element_size (node));
2339 /* Likewise, just because this is a COMPONENT_REF doesn't mean we have a
2340 FIELD_DECL, apparently. The G++ front end can put something else
2341 there, at least temporarily. */
2342 else if (TREE_CODE (node) == COMPONENT_REF
2343 && TREE_CODE (TREE_OPERAND (node, 1)) == FIELD_DECL)
2344 UPDATE_TITCSE (component_ref_field_offset (node));
2345 else if (TREE_CODE (node) == BIT_FIELD_REF)
2346 UPDATE_TITCSE (TREE_OPERAND (node, 2));
2349 /* Now see what's inside. If it's an INDIRECT_REF, copy our properties from
2350 it. If it's a decl, it's invariant and constant if the decl is static.
2351 It's also invariant if it's a decl in the current function. (Taking the
2352 address of a volatile variable is not volatile.) If it's a constant,
2353 the address is both invariant and constant. Otherwise it's neither. */
2354 if (TREE_CODE (node) == INDIRECT_REF)
2355 UPDATE_TITCSE (node);
2356 else if (DECL_P (node))
2360 else if (decl_function_context (node) == current_function_decl)
2365 else if (TREE_CODE_CLASS (TREE_CODE (node)) == 'c')
2370 se |= TREE_SIDE_EFFECTS (node);
2373 TREE_CONSTANT (t) = tc;
2374 TREE_INVARIANT (t) = ti;
2375 TREE_SIDE_EFFECTS (t) = se;
2376 #undef UPDATE_TITCSE
2379 /* Build an expression of code CODE, data type TYPE, and operands as
2380 specified. Expressions and reference nodes can be created this way.
2381 Constants, decls, types and misc nodes cannot be.
2383 We define 5 non-variadic functions, from 0 to 4 arguments. This is
2384 enough for all extant tree codes. These functions can be called
2385 directly (preferably!), but can also be obtained via GCC preprocessor
2386 magic within the build macro. */
2389 build0_stat (enum tree_code code, tree tt MEM_STAT_DECL)
2393 #ifdef ENABLE_CHECKING
2394 if (TREE_CODE_LENGTH (code) != 0)
2398 t = make_node_stat (code PASS_MEM_STAT);
2405 build1_stat (enum tree_code code, tree type, tree node MEM_STAT_DECL)
2407 int length = sizeof (struct tree_exp);
2408 #ifdef GATHER_STATISTICS
2409 tree_node_kind kind;
2413 #ifdef GATHER_STATISTICS
2414 switch (TREE_CODE_CLASS (code))
2416 case 's': /* an expression with side effects */
2419 case 'r': /* a reference */
2427 tree_node_counts[(int) kind]++;
2428 tree_node_sizes[(int) kind] += length;
2431 #ifdef ENABLE_CHECKING
2432 if (TREE_CODE_LENGTH (code) != 1)
2434 #endif /* ENABLE_CHECKING */
2436 t = ggc_alloc_zone_stat (length, tree_zone PASS_MEM_STAT);
2438 memset (t, 0, sizeof (struct tree_common));
2440 TREE_SET_CODE (t, code);
2442 TREE_TYPE (t) = type;
2443 #ifdef USE_MAPPED_LOCATION
2444 SET_EXPR_LOCATION (t, UNKNOWN_LOCATION);
2446 SET_EXPR_LOCUS (t, NULL);
2448 TREE_COMPLEXITY (t) = 0;
2449 TREE_OPERAND (t, 0) = node;
2450 TREE_BLOCK (t) = NULL_TREE;
2451 if (node && !TYPE_P (node) && first_rtl_op (code) != 0)
2453 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (node);
2454 TREE_READONLY (t) = TREE_READONLY (node);
2457 if (TREE_CODE_CLASS (code) == 's')
2458 TREE_SIDE_EFFECTS (t) = 1;
2464 case PREDECREMENT_EXPR:
2465 case PREINCREMENT_EXPR:
2466 case POSTDECREMENT_EXPR:
2467 case POSTINCREMENT_EXPR:
2468 /* All of these have side-effects, no matter what their
2470 TREE_SIDE_EFFECTS (t) = 1;
2471 TREE_READONLY (t) = 0;
2475 /* Whether a dereference is readonly has nothing to do with whether
2476 its operand is readonly. */
2477 TREE_READONLY (t) = 0;
2482 recompute_tree_invarant_for_addr_expr (t);
2486 if (TREE_CODE_CLASS (code) == '1' && node && !TYPE_P (node)
2487 && TREE_CONSTANT (node))
2488 TREE_CONSTANT (t) = 1;
2489 if (TREE_CODE_CLASS (code) == '1' && node && TREE_INVARIANT (node))
2490 TREE_INVARIANT (t) = 1;
2491 if (TREE_CODE_CLASS (code) == 'r' && node && TREE_THIS_VOLATILE (node))
2492 TREE_THIS_VOLATILE (t) = 1;
2499 #define PROCESS_ARG(N) \
2501 TREE_OPERAND (t, N) = arg##N; \
2502 if (arg##N &&!TYPE_P (arg##N) && fro > N) \
2504 if (TREE_SIDE_EFFECTS (arg##N)) \
2506 if (!TREE_READONLY (arg##N)) \
2508 if (!TREE_CONSTANT (arg##N)) \
2510 if (!TREE_INVARIANT (arg##N)) \
2516 build2_stat (enum tree_code code, tree tt, tree arg0, tree arg1 MEM_STAT_DECL)
2518 bool constant, read_only, side_effects, invariant;
2522 #ifdef ENABLE_CHECKING
2523 if (TREE_CODE_LENGTH (code) != 2)
2527 t = make_node_stat (code PASS_MEM_STAT);
2530 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
2531 result based on those same flags for the arguments. But if the
2532 arguments aren't really even `tree' expressions, we shouldn't be trying
2534 fro = first_rtl_op (code);
2536 /* Expressions without side effects may be constant if their
2537 arguments are as well. */
2538 constant = (TREE_CODE_CLASS (code) == '<'
2539 || TREE_CODE_CLASS (code) == '2');
2541 side_effects = TREE_SIDE_EFFECTS (t);
2542 invariant = constant;
2547 TREE_READONLY (t) = read_only;
2548 TREE_CONSTANT (t) = constant;
2549 TREE_INVARIANT (t) = invariant;
2550 TREE_SIDE_EFFECTS (t) = side_effects;
2551 TREE_THIS_VOLATILE (t)
2552 = TREE_CODE_CLASS (code) == 'r' && arg0 && TREE_THIS_VOLATILE (arg0);
2558 build3_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
2559 tree arg2 MEM_STAT_DECL)
2561 bool constant, read_only, side_effects, invariant;
2565 #ifdef ENABLE_CHECKING
2566 if (TREE_CODE_LENGTH (code) != 3)
2570 t = make_node_stat (code PASS_MEM_STAT);
2573 fro = first_rtl_op (code);
2575 side_effects = TREE_SIDE_EFFECTS (t);
2581 if (code == CALL_EXPR && !side_effects)
2586 /* Calls have side-effects, except those to const or
2588 i = call_expr_flags (t);
2589 if (!(i & (ECF_CONST | ECF_PURE)))
2592 /* And even those have side-effects if their arguments do. */
2593 else for (node = arg1; node; node = TREE_CHAIN (node))
2594 if (TREE_SIDE_EFFECTS (TREE_VALUE (node)))
2601 TREE_SIDE_EFFECTS (t) = side_effects;
2602 TREE_THIS_VOLATILE (t)
2603 = TREE_CODE_CLASS (code) == 'r' && arg0 && TREE_THIS_VOLATILE (arg0);
2609 build4_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
2610 tree arg2, tree arg3 MEM_STAT_DECL)
2612 bool constant, read_only, side_effects, invariant;
2616 #ifdef ENABLE_CHECKING
2617 if (TREE_CODE_LENGTH (code) != 4)
2621 t = make_node_stat (code PASS_MEM_STAT);
2624 fro = first_rtl_op (code);
2626 side_effects = TREE_SIDE_EFFECTS (t);
2633 TREE_SIDE_EFFECTS (t) = side_effects;
2634 TREE_THIS_VOLATILE (t)
2635 = TREE_CODE_CLASS (code) == 'r' && arg0 && TREE_THIS_VOLATILE (arg0);
2640 /* Backup definition for non-gcc build compilers. */
2643 (build) (enum tree_code code, tree tt, ...)
2645 tree t, arg0, arg1, arg2, arg3;
2646 int length = TREE_CODE_LENGTH (code);
2653 t = build0 (code, tt);
2656 arg0 = va_arg (p, tree);
2657 t = build1 (code, tt, arg0);
2660 arg0 = va_arg (p, tree);
2661 arg1 = va_arg (p, tree);
2662 t = build2 (code, tt, arg0, arg1);
2665 arg0 = va_arg (p, tree);
2666 arg1 = va_arg (p, tree);
2667 arg2 = va_arg (p, tree);
2668 t = build3 (code, tt, arg0, arg1, arg2);
2671 arg0 = va_arg (p, tree);
2672 arg1 = va_arg (p, tree);
2673 arg2 = va_arg (p, tree);
2674 arg3 = va_arg (p, tree);
2675 t = build4 (code, tt, arg0, arg1, arg2, arg3);
2685 /* Similar except don't specify the TREE_TYPE
2686 and leave the TREE_SIDE_EFFECTS as 0.
2687 It is permissible for arguments to be null,
2688 or even garbage if their values do not matter. */
2691 build_nt (enum tree_code code, ...)
2700 t = make_node (code);
2701 length = TREE_CODE_LENGTH (code);
2703 for (i = 0; i < length; i++)
2704 TREE_OPERAND (t, i) = va_arg (p, tree);
2710 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
2711 We do NOT enter this node in any sort of symbol table.
2713 layout_decl is used to set up the decl's storage layout.
2714 Other slots are initialized to 0 or null pointers. */
2717 build_decl_stat (enum tree_code code, tree name, tree type MEM_STAT_DECL)
2721 t = make_node_stat (code PASS_MEM_STAT);
2723 /* if (type == error_mark_node)
2724 type = integer_type_node; */
2725 /* That is not done, deliberately, so that having error_mark_node
2726 as the type can suppress useless errors in the use of this variable. */
2728 DECL_NAME (t) = name;
2729 TREE_TYPE (t) = type;
2731 if (code == VAR_DECL || code == PARM_DECL || code == RESULT_DECL)
2733 else if (code == FUNCTION_DECL)
2734 DECL_MODE (t) = FUNCTION_MODE;
2739 /* BLOCK nodes are used to represent the structure of binding contours
2740 and declarations, once those contours have been exited and their contents
2741 compiled. This information is used for outputting debugging info. */
2744 build_block (tree vars, tree tags ATTRIBUTE_UNUSED, tree subblocks,
2745 tree supercontext, tree chain)
2747 tree block = make_node (BLOCK);
2749 BLOCK_VARS (block) = vars;
2750 BLOCK_SUBBLOCKS (block) = subblocks;
2751 BLOCK_SUPERCONTEXT (block) = supercontext;
2752 BLOCK_CHAIN (block) = chain;
2756 #if 1 /* ! defined(USE_MAPPED_LOCATION) */
2757 /* ??? gengtype doesn't handle conditionals */
2758 static GTY(()) tree last_annotated_node;
2761 #ifdef USE_MAPPED_LOCATION
2764 expand_location (source_location loc)
2766 expanded_location xloc;
2767 if (loc == 0) { xloc.file = NULL; xloc.line = 0; }
2770 const struct line_map *map = linemap_lookup (&line_table, loc);
2771 xloc.file = map->to_file;
2772 xloc.line = SOURCE_LINE (map, loc);
2779 /* Record the exact location where an expression or an identifier were
2783 annotate_with_file_line (tree node, const char *file, int line)
2785 /* Roughly one percent of the calls to this function are to annotate
2786 a node with the same information already attached to that node!
2787 Just return instead of wasting memory. */
2788 if (EXPR_LOCUS (node)
2789 && (EXPR_FILENAME (node) == file
2790 || ! strcmp (EXPR_FILENAME (node), file))
2791 && EXPR_LINENO (node) == line)
2793 last_annotated_node = node;
2797 /* In heavily macroized code (such as GCC itself) this single
2798 entry cache can reduce the number of allocations by more
2800 if (last_annotated_node
2801 && EXPR_LOCUS (last_annotated_node)
2802 && (EXPR_FILENAME (last_annotated_node) == file
2803 || ! strcmp (EXPR_FILENAME (last_annotated_node), file))
2804 && EXPR_LINENO (last_annotated_node) == line)
2806 SET_EXPR_LOCUS (node, EXPR_LOCUS (last_annotated_node));
2810 SET_EXPR_LOCUS (node, ggc_alloc (sizeof (location_t)));
2811 EXPR_LINENO (node) = line;
2812 EXPR_FILENAME (node) = file;
2813 last_annotated_node = node;
2817 annotate_with_locus (tree node, location_t locus)
2819 annotate_with_file_line (node, locus.file, locus.line);
2823 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
2827 build_decl_attribute_variant (tree ddecl, tree attribute)
2829 DECL_ATTRIBUTES (ddecl) = attribute;
2833 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
2836 Record such modified types already made so we don't make duplicates. */
2839 build_type_attribute_variant (tree ttype, tree attribute)
2841 if (! attribute_list_equal (TYPE_ATTRIBUTES (ttype), attribute))
2843 hashval_t hashcode = 0;
2845 enum tree_code code = TREE_CODE (ttype);
2847 ntype = copy_node (ttype);
2849 TYPE_POINTER_TO (ntype) = 0;
2850 TYPE_REFERENCE_TO (ntype) = 0;
2851 TYPE_ATTRIBUTES (ntype) = attribute;
2853 /* Create a new main variant of TYPE. */
2854 TYPE_MAIN_VARIANT (ntype) = ntype;
2855 TYPE_NEXT_VARIANT (ntype) = 0;
2856 set_type_quals (ntype, TYPE_UNQUALIFIED);
2858 hashcode = iterative_hash_object (code, hashcode);
2859 if (TREE_TYPE (ntype))
2860 hashcode = iterative_hash_object (TYPE_HASH (TREE_TYPE (ntype)),
2862 hashcode = attribute_hash_list (attribute, hashcode);
2864 switch (TREE_CODE (ntype))
2867 hashcode = type_hash_list (TYPE_ARG_TYPES (ntype), hashcode);
2870 hashcode = iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (ntype)),
2874 hashcode = iterative_hash_object
2875 (TREE_INT_CST_LOW (TYPE_MAX_VALUE (ntype)), hashcode);
2876 hashcode = iterative_hash_object
2877 (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (ntype)), hashcode);
2881 unsigned int precision = TYPE_PRECISION (ntype);
2882 hashcode = iterative_hash_object (precision, hashcode);
2889 ntype = type_hash_canon (hashcode, ntype);
2890 ttype = build_qualified_type (ntype, TYPE_QUALS (ttype));
2896 /* Return nonzero if IDENT is a valid name for attribute ATTR,
2899 We try both `text' and `__text__', ATTR may be either one. */
2900 /* ??? It might be a reasonable simplification to require ATTR to be only
2901 `text'. One might then also require attribute lists to be stored in
2902 their canonicalized form. */
2905 is_attribute_p (const char *attr, tree ident)
2907 int ident_len, attr_len;
2910 if (TREE_CODE (ident) != IDENTIFIER_NODE)
2913 if (strcmp (attr, IDENTIFIER_POINTER (ident)) == 0)
2916 p = IDENTIFIER_POINTER (ident);
2917 ident_len = strlen (p);
2918 attr_len = strlen (attr);
2920 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
2924 || attr[attr_len - 2] != '_'
2925 || attr[attr_len - 1] != '_')
2927 if (ident_len == attr_len - 4
2928 && strncmp (attr + 2, p, attr_len - 4) == 0)
2933 if (ident_len == attr_len + 4
2934 && p[0] == '_' && p[1] == '_'
2935 && p[ident_len - 2] == '_' && p[ident_len - 1] == '_'
2936 && strncmp (attr, p + 2, attr_len) == 0)
2943 /* Given an attribute name and a list of attributes, return a pointer to the
2944 attribute's list element if the attribute is part of the list, or NULL_TREE
2945 if not found. If the attribute appears more than once, this only
2946 returns the first occurrence; the TREE_CHAIN of the return value should
2947 be passed back in if further occurrences are wanted. */
2950 lookup_attribute (const char *attr_name, tree list)
2954 for (l = list; l; l = TREE_CHAIN (l))
2956 if (TREE_CODE (TREE_PURPOSE (l)) != IDENTIFIER_NODE)
2958 if (is_attribute_p (attr_name, TREE_PURPOSE (l)))
2965 /* Return an attribute list that is the union of a1 and a2. */
2968 merge_attributes (tree a1, tree a2)
2972 /* Either one unset? Take the set one. */
2974 if ((attributes = a1) == 0)
2977 /* One that completely contains the other? Take it. */
2979 else if (a2 != 0 && ! attribute_list_contained (a1, a2))
2981 if (attribute_list_contained (a2, a1))
2985 /* Pick the longest list, and hang on the other list. */
2987 if (list_length (a1) < list_length (a2))
2988 attributes = a2, a2 = a1;
2990 for (; a2 != 0; a2 = TREE_CHAIN (a2))
2993 for (a = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)),
2996 a = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)),
2999 if (simple_cst_equal (TREE_VALUE (a), TREE_VALUE (a2)) == 1)
3004 a1 = copy_node (a2);
3005 TREE_CHAIN (a1) = attributes;
3014 /* Given types T1 and T2, merge their attributes and return
3018 merge_type_attributes (tree t1, tree t2)
3020 return merge_attributes (TYPE_ATTRIBUTES (t1),
3021 TYPE_ATTRIBUTES (t2));
3024 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
3028 merge_decl_attributes (tree olddecl, tree newdecl)
3030 return merge_attributes (DECL_ATTRIBUTES (olddecl),
3031 DECL_ATTRIBUTES (newdecl));
3034 #ifdef TARGET_DLLIMPORT_DECL_ATTRIBUTES
3036 /* Specialization of merge_decl_attributes for various Windows targets.
3038 This handles the following situation:
3040 __declspec (dllimport) int foo;
3043 The second instance of `foo' nullifies the dllimport. */
3046 merge_dllimport_decl_attributes (tree old, tree new)
3049 int delete_dllimport_p;
3051 old = DECL_ATTRIBUTES (old);
3052 new = DECL_ATTRIBUTES (new);
3054 /* What we need to do here is remove from `old' dllimport if it doesn't
3055 appear in `new'. dllimport behaves like extern: if a declaration is
3056 marked dllimport and a definition appears later, then the object
3057 is not dllimport'd. */
3058 if (lookup_attribute ("dllimport", old) != NULL_TREE
3059 && lookup_attribute ("dllimport", new) == NULL_TREE)
3060 delete_dllimport_p = 1;
3062 delete_dllimport_p = 0;
3064 a = merge_attributes (old, new);
3066 if (delete_dllimport_p)
3070 /* Scan the list for dllimport and delete it. */
3071 for (prev = NULL_TREE, t = a; t; prev = t, t = TREE_CHAIN (t))
3073 if (is_attribute_p ("dllimport", TREE_PURPOSE (t)))
3075 if (prev == NULL_TREE)
3078 TREE_CHAIN (prev) = TREE_CHAIN (t);
3087 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
3089 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
3090 of the various TYPE_QUAL values. */
3093 set_type_quals (tree type, int type_quals)
3095 TYPE_READONLY (type) = (type_quals & TYPE_QUAL_CONST) != 0;
3096 TYPE_VOLATILE (type) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
3097 TYPE_RESTRICT (type) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
3100 /* Returns true iff cand is equivalent to base with type_quals. */
3103 check_qualified_type (tree cand, tree base, int type_quals)
3105 return (TYPE_QUALS (cand) == type_quals
3106 && TYPE_NAME (cand) == TYPE_NAME (base)
3107 /* Apparently this is needed for Objective-C. */
3108 && TYPE_CONTEXT (cand) == TYPE_CONTEXT (base)
3109 && attribute_list_equal (TYPE_ATTRIBUTES (cand),
3110 TYPE_ATTRIBUTES (base)));
3113 /* Return a version of the TYPE, qualified as indicated by the
3114 TYPE_QUALS, if one exists. If no qualified version exists yet,
3115 return NULL_TREE. */
3118 get_qualified_type (tree type, int type_quals)
3122 if (TYPE_QUALS (type) == type_quals)
3125 /* Search the chain of variants to see if there is already one there just
3126 like the one we need to have. If so, use that existing one. We must
3127 preserve the TYPE_NAME, since there is code that depends on this. */
3128 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
3129 if (check_qualified_type (t, type, type_quals))
3135 /* Like get_qualified_type, but creates the type if it does not
3136 exist. This function never returns NULL_TREE. */
3139 build_qualified_type (tree type, int type_quals)
3143 /* See if we already have the appropriate qualified variant. */
3144 t = get_qualified_type (type, type_quals);
3146 /* If not, build it. */
3149 t = build_type_copy (type);
3150 set_type_quals (t, type_quals);
3156 /* Create a new variant of TYPE, equivalent but distinct.
3157 This is so the caller can modify it. */
3160 build_type_copy (tree type)
3162 tree t, m = TYPE_MAIN_VARIANT (type);
3164 t = copy_node (type);
3166 TYPE_POINTER_TO (t) = 0;
3167 TYPE_REFERENCE_TO (t) = 0;
3169 /* Add this type to the chain of variants of TYPE. */
3170 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (m);
3171 TYPE_NEXT_VARIANT (m) = t;
3176 /* Hashing of types so that we don't make duplicates.
3177 The entry point is `type_hash_canon'. */
3179 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
3180 with types in the TREE_VALUE slots), by adding the hash codes
3181 of the individual types. */
3184 type_hash_list (tree list, hashval_t hashcode)
3188 for (tail = list; tail; tail = TREE_CHAIN (tail))
3189 if (TREE_VALUE (tail) != error_mark_node)
3190 hashcode = iterative_hash_object (TYPE_HASH (TREE_VALUE (tail)),
3196 /* These are the Hashtable callback functions. */
3198 /* Returns true iff the types are equivalent. */
3201 type_hash_eq (const void *va, const void *vb)
3203 const struct type_hash *a = va, *b = vb;
3205 /* First test the things that are the same for all types. */
3206 if (a->hash != b->hash
3207 || TREE_CODE (a->type) != TREE_CODE (b->type)
3208 || TREE_TYPE (a->type) != TREE_TYPE (b->type)
3209 || !attribute_list_equal (TYPE_ATTRIBUTES (a->type),
3210 TYPE_ATTRIBUTES (b->type))
3211 || TYPE_ALIGN (a->type) != TYPE_ALIGN (b->type)
3212 || TYPE_MODE (a->type) != TYPE_MODE (b->type))
3215 switch (TREE_CODE (a->type))
3221 case REFERENCE_TYPE:
3225 if (TYPE_VALUES (a->type) != TYPE_VALUES (b->type)
3226 && !(TYPE_VALUES (a->type)
3227 && TREE_CODE (TYPE_VALUES (a->type)) == TREE_LIST
3228 && TYPE_VALUES (b->type)
3229 && TREE_CODE (TYPE_VALUES (b->type)) == TREE_LIST
3230 && type_list_equal (TYPE_VALUES (a->type),
3231 TYPE_VALUES (b->type))))
3234 /* ... fall through ... */
3240 return ((TYPE_MAX_VALUE (a->type) == TYPE_MAX_VALUE (b->type)
3241 || tree_int_cst_equal (TYPE_MAX_VALUE (a->type),
3242 TYPE_MAX_VALUE (b->type)))
3243 && (TYPE_MIN_VALUE (a->type) == TYPE_MIN_VALUE (b->type)
3244 || tree_int_cst_equal (TYPE_MIN_VALUE (a->type),
3245 TYPE_MIN_VALUE (b->type))));
3248 return TYPE_OFFSET_BASETYPE (a->type) == TYPE_OFFSET_BASETYPE (b->type);
3251 return (TYPE_METHOD_BASETYPE (a->type) == TYPE_METHOD_BASETYPE (b->type)
3252 && (TYPE_ARG_TYPES (a->type) == TYPE_ARG_TYPES (b->type)
3253 || (TYPE_ARG_TYPES (a->type)
3254 && TREE_CODE (TYPE_ARG_TYPES (a->type)) == TREE_LIST
3255 && TYPE_ARG_TYPES (b->type)
3256 && TREE_CODE (TYPE_ARG_TYPES (b->type)) == TREE_LIST
3257 && type_list_equal (TYPE_ARG_TYPES (a->type),
3258 TYPE_ARG_TYPES (b->type)))));
3262 return TYPE_DOMAIN (a->type) == TYPE_DOMAIN (b->type);
3266 case QUAL_UNION_TYPE:
3267 return (TYPE_FIELDS (a->type) == TYPE_FIELDS (b->type)
3268 || (TYPE_FIELDS (a->type)
3269 && TREE_CODE (TYPE_FIELDS (a->type)) == TREE_LIST
3270 && TYPE_FIELDS (b->type)
3271 && TREE_CODE (TYPE_FIELDS (b->type)) == TREE_LIST
3272 && type_list_equal (TYPE_FIELDS (a->type),
3273 TYPE_FIELDS (b->type))));
3276 return (TYPE_ARG_TYPES (a->type) == TYPE_ARG_TYPES (b->type)
3277 || (TYPE_ARG_TYPES (a->type)
3278 && TREE_CODE (TYPE_ARG_TYPES (a->type)) == TREE_LIST
3279 && TYPE_ARG_TYPES (b->type)
3280 && TREE_CODE (TYPE_ARG_TYPES (b->type)) == TREE_LIST
3281 && type_list_equal (TYPE_ARG_TYPES (a->type),
3282 TYPE_ARG_TYPES (b->type))));
3289 /* Return the cached hash value. */
3292 type_hash_hash (const void *item)
3294 return ((const struct type_hash *) item)->hash;
3297 /* Look in the type hash table for a type isomorphic to TYPE.
3298 If one is found, return it. Otherwise return 0. */
3301 type_hash_lookup (hashval_t hashcode, tree type)
3303 struct type_hash *h, in;
3305 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
3306 must call that routine before comparing TYPE_ALIGNs. */
3312 h = htab_find_with_hash (type_hash_table, &in, hashcode);
3318 /* Add an entry to the type-hash-table
3319 for a type TYPE whose hash code is HASHCODE. */
3322 type_hash_add (hashval_t hashcode, tree type)
3324 struct type_hash *h;
3327 h = ggc_alloc (sizeof (struct type_hash));
3330 loc = htab_find_slot_with_hash (type_hash_table, h, hashcode, INSERT);
3331 *(struct type_hash **) loc = h;
3334 /* Given TYPE, and HASHCODE its hash code, return the canonical
3335 object for an identical type if one already exists.
3336 Otherwise, return TYPE, and record it as the canonical object.
3338 To use this function, first create a type of the sort you want.
3339 Then compute its hash code from the fields of the type that
3340 make it different from other similar types.
3341 Then call this function and use the value. */
3344 type_hash_canon (unsigned int hashcode, tree type)
3348 /* The hash table only contains main variants, so ensure that's what we're
3350 if (TYPE_MAIN_VARIANT (type) != type)
3353 if (!lang_hooks.types.hash_types)
3356 /* See if the type is in the hash table already. If so, return it.
3357 Otherwise, add the type. */
3358 t1 = type_hash_lookup (hashcode, type);
3361 #ifdef GATHER_STATISTICS
3362 tree_node_counts[(int) t_kind]--;
3363 tree_node_sizes[(int) t_kind] -= sizeof (struct tree_type);
3369 type_hash_add (hashcode, type);
3374 /* See if the data pointed to by the type hash table is marked. We consider
3375 it marked if the type is marked or if a debug type number or symbol
3376 table entry has been made for the type. This reduces the amount of
3377 debugging output and eliminates that dependency of the debug output on
3378 the number of garbage collections. */
3381 type_hash_marked_p (const void *p)
3383 tree type = ((struct type_hash *) p)->type;
3385 return ggc_marked_p (type) || TYPE_SYMTAB_POINTER (type);
3389 print_type_hash_statistics (void)
3391 fprintf (stderr, "Type hash: size %ld, %ld elements, %f collisions\n",
3392 (long) htab_size (type_hash_table),
3393 (long) htab_elements (type_hash_table),
3394 htab_collisions (type_hash_table));
3397 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
3398 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
3399 by adding the hash codes of the individual attributes. */
3402 attribute_hash_list (tree list, hashval_t hashcode)
3406 for (tail = list; tail; tail = TREE_CHAIN (tail))
3407 /* ??? Do we want to add in TREE_VALUE too? */
3408 hashcode = iterative_hash_object
3409 (IDENTIFIER_HASH_VALUE (TREE_PURPOSE (tail)), hashcode);
3413 /* Given two lists of attributes, return true if list l2 is
3414 equivalent to l1. */
3417 attribute_list_equal (tree l1, tree l2)
3419 return attribute_list_contained (l1, l2)
3420 && attribute_list_contained (l2, l1);
3423 /* Given two lists of attributes, return true if list L2 is
3424 completely contained within L1. */
3425 /* ??? This would be faster if attribute names were stored in a canonicalized
3426 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
3427 must be used to show these elements are equivalent (which they are). */
3428 /* ??? It's not clear that attributes with arguments will always be handled
3432 attribute_list_contained (tree l1, tree l2)
3436 /* First check the obvious, maybe the lists are identical. */
3440 /* Maybe the lists are similar. */
3441 for (t1 = l1, t2 = l2;
3443 && TREE_PURPOSE (t1) == TREE_PURPOSE (t2)
3444 && TREE_VALUE (t1) == TREE_VALUE (t2);
3445 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2));
3447 /* Maybe the lists are equal. */
3448 if (t1 == 0 && t2 == 0)
3451 for (; t2 != 0; t2 = TREE_CHAIN (t2))
3454 for (attr = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)), l1);
3456 attr = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)),
3459 if (simple_cst_equal (TREE_VALUE (t2), TREE_VALUE (attr)) == 1)
3466 if (simple_cst_equal (TREE_VALUE (t2), TREE_VALUE (attr)) != 1)
3473 /* Given two lists of types
3474 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
3475 return 1 if the lists contain the same types in the same order.
3476 Also, the TREE_PURPOSEs must match. */
3479 type_list_equal (tree l1, tree l2)
3483 for (t1 = l1, t2 = l2; t1 && t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
3484 if (TREE_VALUE (t1) != TREE_VALUE (t2)
3485 || (TREE_PURPOSE (t1) != TREE_PURPOSE (t2)
3486 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2))
3487 && (TREE_TYPE (TREE_PURPOSE (t1))
3488 == TREE_TYPE (TREE_PURPOSE (t2))))))
3494 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
3495 given by TYPE. If the argument list accepts variable arguments,
3496 then this function counts only the ordinary arguments. */
3499 type_num_arguments (tree type)
3504 for (t = TYPE_ARG_TYPES (type); t; t = TREE_CHAIN (t))
3505 /* If the function does not take a variable number of arguments,
3506 the last element in the list will have type `void'. */
3507 if (VOID_TYPE_P (TREE_VALUE (t)))
3515 /* Nonzero if integer constants T1 and T2
3516 represent the same constant value. */
3519 tree_int_cst_equal (tree t1, tree t2)
3524 if (t1 == 0 || t2 == 0)
3527 if (TREE_CODE (t1) == INTEGER_CST
3528 && TREE_CODE (t2) == INTEGER_CST
3529 && TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
3530 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2))
3536 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
3537 The precise way of comparison depends on their data type. */
3540 tree_int_cst_lt (tree t1, tree t2)
3545 if (TYPE_UNSIGNED (TREE_TYPE (t1)) != TYPE_UNSIGNED (TREE_TYPE (t2)))
3547 int t1_sgn = tree_int_cst_sgn (t1);
3548 int t2_sgn = tree_int_cst_sgn (t2);
3550 if (t1_sgn < t2_sgn)
3552 else if (t1_sgn > t2_sgn)
3554 /* Otherwise, both are non-negative, so we compare them as
3555 unsigned just in case one of them would overflow a signed
3558 else if (!TYPE_UNSIGNED (TREE_TYPE (t1)))
3559 return INT_CST_LT (t1, t2);
3561 return INT_CST_LT_UNSIGNED (t1, t2);
3564 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
3567 tree_int_cst_compare (tree t1, tree t2)
3569 if (tree_int_cst_lt (t1, t2))
3571 else if (tree_int_cst_lt (t2, t1))
3577 /* Return 1 if T is an INTEGER_CST that can be manipulated efficiently on
3578 the host. If POS is zero, the value can be represented in a single
3579 HOST_WIDE_INT. If POS is nonzero, the value must be positive and can
3580 be represented in a single unsigned HOST_WIDE_INT. */
3583 host_integerp (tree t, int pos)
3585 return (TREE_CODE (t) == INTEGER_CST
3586 && ! TREE_OVERFLOW (t)
3587 && ((TREE_INT_CST_HIGH (t) == 0
3588 && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) >= 0)
3589 || (! pos && TREE_INT_CST_HIGH (t) == -1
3590 && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0
3591 && !TYPE_UNSIGNED (TREE_TYPE (t)))
3592 || (pos && TREE_INT_CST_HIGH (t) == 0)));
3595 /* Return the HOST_WIDE_INT least significant bits of T if it is an
3596 INTEGER_CST and there is no overflow. POS is nonzero if the result must
3597 be positive. Abort if we cannot satisfy the above conditions. */
3600 tree_low_cst (tree t, int pos)
3602 if (host_integerp (t, pos))
3603 return TREE_INT_CST_LOW (t);
3608 /* Return the most significant bit of the integer constant T. */
3611 tree_int_cst_msb (tree t)
3615 unsigned HOST_WIDE_INT l;
3617 /* Note that using TYPE_PRECISION here is wrong. We care about the
3618 actual bits, not the (arbitrary) range of the type. */
3619 prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t))) - 1;
3620 rshift_double (TREE_INT_CST_LOW (t), TREE_INT_CST_HIGH (t), prec,
3621 2 * HOST_BITS_PER_WIDE_INT, &l, &h, 0);
3622 return (l & 1) == 1;
3625 /* Return an indication of the sign of the integer constant T.
3626 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
3627 Note that -1 will never be returned it T's type is unsigned. */
3630 tree_int_cst_sgn (tree t)
3632 if (TREE_INT_CST_LOW (t) == 0 && TREE_INT_CST_HIGH (t) == 0)
3634 else if (TYPE_UNSIGNED (TREE_TYPE (t)))
3636 else if (TREE_INT_CST_HIGH (t) < 0)
3642 /* Compare two constructor-element-type constants. Return 1 if the lists
3643 are known to be equal; otherwise return 0. */
3646 simple_cst_list_equal (tree l1, tree l2)
3648 while (l1 != NULL_TREE && l2 != NULL_TREE)
3650 if (simple_cst_equal (TREE_VALUE (l1), TREE_VALUE (l2)) != 1)
3653 l1 = TREE_CHAIN (l1);
3654 l2 = TREE_CHAIN (l2);
3660 /* Return truthvalue of whether T1 is the same tree structure as T2.
3661 Return 1 if they are the same.
3662 Return 0 if they are understandably different.
3663 Return -1 if either contains tree structure not understood by
3667 simple_cst_equal (tree t1, tree t2)
3669 enum tree_code code1, code2;
3675 if (t1 == 0 || t2 == 0)
3678 code1 = TREE_CODE (t1);
3679 code2 = TREE_CODE (t2);
3681 if (code1 == NOP_EXPR || code1 == CONVERT_EXPR || code1 == NON_LVALUE_EXPR)
3683 if (code2 == NOP_EXPR || code2 == CONVERT_EXPR
3684 || code2 == NON_LVALUE_EXPR)
3685 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3687 return simple_cst_equal (TREE_OPERAND (t1, 0), t2);
3690 else if (code2 == NOP_EXPR || code2 == CONVERT_EXPR
3691 || code2 == NON_LVALUE_EXPR)
3692 return simple_cst_equal (t1, TREE_OPERAND (t2, 0));
3700 return (TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
3701 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2));
3704 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
3707 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
3708 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
3709 TREE_STRING_LENGTH (t1)));
3712 return simple_cst_list_equal (CONSTRUCTOR_ELTS (t1),
3713 CONSTRUCTOR_ELTS (t2));
3716 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3719 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3723 simple_cst_list_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
3726 /* Special case: if either target is an unallocated VAR_DECL,
3727 it means that it's going to be unified with whatever the
3728 TARGET_EXPR is really supposed to initialize, so treat it
3729 as being equivalent to anything. */
3730 if ((TREE_CODE (TREE_OPERAND (t1, 0)) == VAR_DECL
3731 && DECL_NAME (TREE_OPERAND (t1, 0)) == NULL_TREE
3732 && !DECL_RTL_SET_P (TREE_OPERAND (t1, 0)))
3733 || (TREE_CODE (TREE_OPERAND (t2, 0)) == VAR_DECL
3734 && DECL_NAME (TREE_OPERAND (t2, 0)) == NULL_TREE
3735 && !DECL_RTL_SET_P (TREE_OPERAND (t2, 0))))
3738 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3743 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
3745 case WITH_CLEANUP_EXPR:
3746 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3750 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t1, 1));
3753 if (TREE_OPERAND (t1, 1) == TREE_OPERAND (t2, 1))
3754 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3768 /* This general rule works for most tree codes. All exceptions should be
3769 handled above. If this is a language-specific tree code, we can't
3770 trust what might be in the operand, so say we don't know
3772 if ((int) code1 >= (int) LAST_AND_UNUSED_TREE_CODE)
3775 switch (TREE_CODE_CLASS (code1))
3784 for (i = 0; i < TREE_CODE_LENGTH (code1); i++)
3786 cmp = simple_cst_equal (TREE_OPERAND (t1, i), TREE_OPERAND (t2, i));
3798 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
3799 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
3800 than U, respectively. */
3803 compare_tree_int (tree t, unsigned HOST_WIDE_INT u)
3805 if (tree_int_cst_sgn (t) < 0)
3807 else if (TREE_INT_CST_HIGH (t) != 0)
3809 else if (TREE_INT_CST_LOW (t) == u)
3811 else if (TREE_INT_CST_LOW (t) < u)
3817 /* Return true if CODE represents an associative tree code. Otherwise
3820 associative_tree_code (enum tree_code code)
3839 /* Return true if CODE represents an commutative tree code. Otherwise
3842 commutative_tree_code (enum tree_code code)
3855 case UNORDERED_EXPR:
3859 case TRUTH_AND_EXPR:
3860 case TRUTH_XOR_EXPR:
3870 /* Generate a hash value for an expression. This can be used iteratively
3871 by passing a previous result as the "val" argument.
3873 This function is intended to produce the same hash for expressions which
3874 would compare equal using operand_equal_p. */
3877 iterative_hash_expr (tree t, hashval_t val)
3880 enum tree_code code;
3884 return iterative_hash_object (t, val);
3886 code = TREE_CODE (t);
3887 class = TREE_CODE_CLASS (code);
3890 || TREE_CODE (t) == VALUE_HANDLE)
3892 /* Decls we can just compare by pointer. */
3893 val = iterative_hash_object (t, val);
3895 else if (class == 'c')
3897 /* Alas, constants aren't shared, so we can't rely on pointer
3899 if (code == INTEGER_CST)
3901 val = iterative_hash_object (TREE_INT_CST_LOW (t), val);
3902 val = iterative_hash_object (TREE_INT_CST_HIGH (t), val);
3904 else if (code == REAL_CST)
3906 unsigned int val2 = real_hash (TREE_REAL_CST_PTR (t));
3908 val = iterative_hash (&val2, sizeof (unsigned int), val);
3910 else if (code == STRING_CST)
3911 val = iterative_hash (TREE_STRING_POINTER (t),
3912 TREE_STRING_LENGTH (t), val);
3913 else if (code == COMPLEX_CST)
3915 val = iterative_hash_expr (TREE_REALPART (t), val);
3916 val = iterative_hash_expr (TREE_IMAGPART (t), val);
3918 else if (code == VECTOR_CST)
3919 val = iterative_hash_expr (TREE_VECTOR_CST_ELTS (t), val);
3923 else if (IS_EXPR_CODE_CLASS (class))
3925 val = iterative_hash_object (code, val);
3927 /* Don't hash the type, that can lead to having nodes which
3928 compare equal according to operand_equal_p, but which
3929 have different hash codes. */
3930 if (code == NOP_EXPR
3931 || code == CONVERT_EXPR
3932 || code == NON_LVALUE_EXPR)
3934 /* Make sure to include signness in the hash computation. */
3935 val += TYPE_UNSIGNED (TREE_TYPE (t));
3936 val = iterative_hash_expr (TREE_OPERAND (t, 0), val);
3939 if (commutative_tree_code (code))
3941 /* It's a commutative expression. We want to hash it the same
3942 however it appears. We do this by first hashing both operands
3943 and then rehashing based on the order of their independent
3945 hashval_t one = iterative_hash_expr (TREE_OPERAND (t, 0), 0);
3946 hashval_t two = iterative_hash_expr (TREE_OPERAND (t, 1), 0);
3950 t = one, one = two, two = t;
3952 val = iterative_hash_object (one, val);
3953 val = iterative_hash_object (two, val);
3956 for (i = first_rtl_op (code) - 1; i >= 0; --i)
3957 val = iterative_hash_expr (TREE_OPERAND (t, i), val);
3959 else if (code == TREE_LIST)
3961 /* A list of expressions, for a CALL_EXPR or as the elements of a
3963 for (; t; t = TREE_CHAIN (t))
3964 val = iterative_hash_expr (TREE_VALUE (t), val);
3966 else if (code == SSA_NAME)
3968 val = iterative_hash_object (SSA_NAME_VERSION (t), val);
3969 val = iterative_hash_expr (SSA_NAME_VAR (t), val);
3977 /* Constructors for pointer, array and function types.
3978 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
3979 constructed by language-dependent code, not here.) */
3981 /* Construct, lay out and return the type of pointers to TO_TYPE with
3982 mode MODE. If CAN_ALIAS_ALL is TRUE, indicate this type can
3983 reference all of memory. If such a type has already been
3984 constructed, reuse it. */
3987 build_pointer_type_for_mode (tree to_type, enum machine_mode mode,
3992 /* In some cases, languages will have things that aren't a POINTER_TYPE
3993 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_POINTER_TO.
3994 In that case, return that type without regard to the rest of our
3997 ??? This is a kludge, but consistent with the way this function has
3998 always operated and there doesn't seem to be a good way to avoid this
4000 if (TYPE_POINTER_TO (to_type) != 0
4001 && TREE_CODE (TYPE_POINTER_TO (to_type)) != POINTER_TYPE)
4002 return TYPE_POINTER_TO (to_type);
4004 /* First, if we already have a type for pointers to TO_TYPE and it's
4005 the proper mode, use it. */
4006 for (t = TYPE_POINTER_TO (to_type); t; t = TYPE_NEXT_PTR_TO (t))
4007 if (TYPE_MODE (t) == mode && TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
4010 t = make_node (POINTER_TYPE);
4012 TREE_TYPE (t) = to_type;
4013 TYPE_MODE (t) = mode;
4014 TYPE_REF_CAN_ALIAS_ALL (t) = can_alias_all;
4015 TYPE_NEXT_PTR_TO (t) = TYPE_POINTER_TO (to_type);
4016 TYPE_POINTER_TO (to_type) = t;
4018 /* Lay out the type. This function has many callers that are concerned
4019 with expression-construction, and this simplifies them all. */
4025 /* By default build pointers in ptr_mode. */
4028 build_pointer_type (tree to_type)
4030 return build_pointer_type_for_mode (to_type, ptr_mode, false);
4033 /* Same as build_pointer_type_for_mode, but for REFERENCE_TYPE. */
4036 build_reference_type_for_mode (tree to_type, enum machine_mode mode,
4041 /* In some cases, languages will have things that aren't a REFERENCE_TYPE
4042 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_REFERENCE_TO.
4043 In that case, return that type without regard to the rest of our
4046 ??? This is a kludge, but consistent with the way this function has
4047 always operated and there doesn't seem to be a good way to avoid this
4049 if (TYPE_REFERENCE_TO (to_type) != 0
4050 && TREE_CODE (TYPE_REFERENCE_TO (to_type)) != REFERENCE_TYPE)
4051 return TYPE_REFERENCE_TO (to_type);
4053 /* First, if we already have a type for pointers to TO_TYPE and it's
4054 the proper mode, use it. */
4055 for (t = TYPE_REFERENCE_TO (to_type); t; t = TYPE_NEXT_REF_TO (t))
4056 if (TYPE_MODE (t) == mode && TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
4059 t = make_node (REFERENCE_TYPE);
4061 TREE_TYPE (t) = to_type;
4062 TYPE_MODE (t) = mode;
4063 TYPE_REF_CAN_ALIAS_ALL (t) = can_alias_all;
4064 TYPE_NEXT_REF_TO (t) = TYPE_REFERENCE_TO (to_type);
4065 TYPE_REFERENCE_TO (to_type) = t;
4073 /* Build the node for the type of references-to-TO_TYPE by default
4077 build_reference_type (tree to_type)
4079 return build_reference_type_for_mode (to_type, ptr_mode, false);
4082 /* Build a type that is compatible with t but has no cv quals anywhere
4085 const char *const *const * -> char ***. */
4088 build_type_no_quals (tree t)
4090 switch (TREE_CODE (t))
4093 return build_pointer_type_for_mode (build_type_no_quals (TREE_TYPE (t)),
4095 TYPE_REF_CAN_ALIAS_ALL (t));
4096 case REFERENCE_TYPE:
4098 build_reference_type_for_mode (build_type_no_quals (TREE_TYPE (t)),
4100 TYPE_REF_CAN_ALIAS_ALL (t));
4102 return TYPE_MAIN_VARIANT (t);
4106 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
4107 MAXVAL should be the maximum value in the domain
4108 (one less than the length of the array).
4110 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
4111 We don't enforce this limit, that is up to caller (e.g. language front end).
4112 The limit exists because the result is a signed type and we don't handle
4113 sizes that use more than one HOST_WIDE_INT. */
4116 build_index_type (tree maxval)
4118 tree itype = make_node (INTEGER_TYPE);
4120 TREE_TYPE (itype) = sizetype;
4121 TYPE_PRECISION (itype) = TYPE_PRECISION (sizetype);
4122 TYPE_MIN_VALUE (itype) = size_zero_node;
4123 TYPE_MAX_VALUE (itype) = convert (sizetype, maxval);
4124 TYPE_MODE (itype) = TYPE_MODE (sizetype);
4125 TYPE_SIZE (itype) = TYPE_SIZE (sizetype);
4126 TYPE_SIZE_UNIT (itype) = TYPE_SIZE_UNIT (sizetype);
4127 TYPE_ALIGN (itype) = TYPE_ALIGN (sizetype);
4128 TYPE_USER_ALIGN (itype) = TYPE_USER_ALIGN (sizetype);
4130 if (host_integerp (maxval, 1))
4131 return type_hash_canon (tree_low_cst (maxval, 1), itype);
4136 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
4137 ENUMERAL_TYPE, BOOLEAN_TYPE, or CHAR_TYPE), with
4138 low bound LOWVAL and high bound HIGHVAL.
4139 if TYPE==NULL_TREE, sizetype is used. */
4142 build_range_type (tree type, tree lowval, tree highval)
4144 tree itype = make_node (INTEGER_TYPE);
4146 TREE_TYPE (itype) = type;
4147 if (type == NULL_TREE)
4150 TYPE_MIN_VALUE (itype) = convert (type, lowval);
4151 TYPE_MAX_VALUE (itype) = highval ? convert (type, highval) : NULL;
4153 TYPE_PRECISION (itype) = TYPE_PRECISION (type);
4154 TYPE_MODE (itype) = TYPE_MODE (type);
4155 TYPE_SIZE (itype) = TYPE_SIZE (type);
4156 TYPE_SIZE_UNIT (itype) = TYPE_SIZE_UNIT (type);
4157 TYPE_ALIGN (itype) = TYPE_ALIGN (type);
4158 TYPE_USER_ALIGN (itype) = TYPE_USER_ALIGN (type);
4160 if (host_integerp (lowval, 0) && highval != 0 && host_integerp (highval, 0))
4161 return type_hash_canon (tree_low_cst (highval, 0)
4162 - tree_low_cst (lowval, 0),
4168 /* Just like build_index_type, but takes lowval and highval instead
4169 of just highval (maxval). */
4172 build_index_2_type (tree lowval, tree highval)
4174 return build_range_type (sizetype, lowval, highval);
4177 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
4178 and number of elements specified by the range of values of INDEX_TYPE.
4179 If such a type has already been constructed, reuse it. */
4182 build_array_type (tree elt_type, tree index_type)
4185 hashval_t hashcode = 0;
4187 if (TREE_CODE (elt_type) == FUNCTION_TYPE)
4189 error ("arrays of functions are not meaningful");
4190 elt_type = integer_type_node;
4193 t = make_node (ARRAY_TYPE);
4194 TREE_TYPE (t) = elt_type;
4195 TYPE_DOMAIN (t) = index_type;
4197 if (index_type == 0)
4200 hashcode = iterative_hash_object (TYPE_HASH (elt_type), hashcode);
4201 hashcode = iterative_hash_object (TYPE_HASH (index_type), hashcode);
4202 t = type_hash_canon (hashcode, t);
4204 if (!COMPLETE_TYPE_P (t))
4209 /* Return the TYPE of the elements comprising
4210 the innermost dimension of ARRAY. */
4213 get_inner_array_type (tree array)
4215 tree type = TREE_TYPE (array);
4217 while (TREE_CODE (type) == ARRAY_TYPE)
4218 type = TREE_TYPE (type);
4223 /* Construct, lay out and return
4224 the type of functions returning type VALUE_TYPE
4225 given arguments of types ARG_TYPES.
4226 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
4227 are data type nodes for the arguments of the function.
4228 If such a type has already been constructed, reuse it. */
4231 build_function_type (tree value_type, tree arg_types)
4234 hashval_t hashcode = 0;
4236 if (TREE_CODE (value_type) == FUNCTION_TYPE)
4238 error ("function return type cannot be function");
4239 value_type = integer_type_node;
4242 /* Make a node of the sort we want. */
4243 t = make_node (FUNCTION_TYPE);
4244 TREE_TYPE (t) = value_type;
4245 TYPE_ARG_TYPES (t) = arg_types;
4247 /* If we already have such a type, use the old one. */
4248 hashcode = iterative_hash_object (TYPE_HASH (value_type), hashcode);
4249 hashcode = type_hash_list (arg_types, hashcode);
4250 t = type_hash_canon (hashcode, t);
4252 if (!COMPLETE_TYPE_P (t))
4257 /* Build a function type. The RETURN_TYPE is the type returned by the
4258 function. If additional arguments are provided, they are
4259 additional argument types. The list of argument types must always
4260 be terminated by NULL_TREE. */
4263 build_function_type_list (tree return_type, ...)
4268 va_start (p, return_type);
4270 t = va_arg (p, tree);
4271 for (args = NULL_TREE; t != NULL_TREE; t = va_arg (p, tree))
4272 args = tree_cons (NULL_TREE, t, args);
4275 args = nreverse (args);
4276 TREE_CHAIN (last) = void_list_node;
4277 args = build_function_type (return_type, args);
4283 /* Build a METHOD_TYPE for a member of BASETYPE. The RETTYPE (a TYPE)
4284 and ARGTYPES (a TREE_LIST) are the return type and arguments types
4285 for the method. An implicit additional parameter (of type
4286 pointer-to-BASETYPE) is added to the ARGTYPES. */
4289 build_method_type_directly (tree basetype,
4297 /* Make a node of the sort we want. */
4298 t = make_node (METHOD_TYPE);
4300 TYPE_METHOD_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
4301 TREE_TYPE (t) = rettype;
4302 ptype = build_pointer_type (basetype);
4304 /* The actual arglist for this function includes a "hidden" argument
4305 which is "this". Put it into the list of argument types. */
4306 argtypes = tree_cons (NULL_TREE, ptype, argtypes);
4307 TYPE_ARG_TYPES (t) = argtypes;
4309 /* If we already have such a type, use the old one. */
4310 hashcode = iterative_hash_object (TYPE_HASH (basetype), hashcode);
4311 hashcode = iterative_hash_object (TYPE_HASH (rettype), hashcode);
4312 hashcode = type_hash_list (argtypes, hashcode);
4313 t = type_hash_canon (hashcode, t);
4315 if (!COMPLETE_TYPE_P (t))
4321 /* Construct, lay out and return the type of methods belonging to class
4322 BASETYPE and whose arguments and values are described by TYPE.
4323 If that type exists already, reuse it.
4324 TYPE must be a FUNCTION_TYPE node. */
4327 build_method_type (tree basetype, tree type)
4329 if (TREE_CODE (type) != FUNCTION_TYPE)
4332 return build_method_type_directly (basetype,
4334 TYPE_ARG_TYPES (type));
4337 /* Construct, lay out and return the type of offsets to a value
4338 of type TYPE, within an object of type BASETYPE.
4339 If a suitable offset type exists already, reuse it. */
4342 build_offset_type (tree basetype, tree type)
4345 hashval_t hashcode = 0;
4347 /* Make a node of the sort we want. */
4348 t = make_node (OFFSET_TYPE);
4350 TYPE_OFFSET_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
4351 TREE_TYPE (t) = type;
4353 /* If we already have such a type, use the old one. */
4354 hashcode = iterative_hash_object (TYPE_HASH (basetype), hashcode);
4355 hashcode = iterative_hash_object (TYPE_HASH (type), hashcode);
4356 t = type_hash_canon (hashcode, t);
4358 if (!COMPLETE_TYPE_P (t))
4364 /* Create a complex type whose components are COMPONENT_TYPE. */
4367 build_complex_type (tree component_type)
4372 /* Make a node of the sort we want. */
4373 t = make_node (COMPLEX_TYPE);
4375 TREE_TYPE (t) = TYPE_MAIN_VARIANT (component_type);
4377 /* If we already have such a type, use the old one. */
4378 hashcode = iterative_hash_object (TYPE_HASH (component_type), 0);
4379 t = type_hash_canon (hashcode, t);
4381 if (!COMPLETE_TYPE_P (t))
4384 /* If we are writing Dwarf2 output we need to create a name,
4385 since complex is a fundamental type. */
4386 if ((write_symbols == DWARF2_DEBUG || write_symbols == VMS_AND_DWARF2_DEBUG)
4390 if (component_type == char_type_node)
4391 name = "complex char";
4392 else if (component_type == signed_char_type_node)
4393 name = "complex signed char";
4394 else if (component_type == unsigned_char_type_node)
4395 name = "complex unsigned char";
4396 else if (component_type == short_integer_type_node)
4397 name = "complex short int";
4398 else if (component_type == short_unsigned_type_node)
4399 name = "complex short unsigned int";
4400 else if (component_type == integer_type_node)
4401 name = "complex int";
4402 else if (component_type == unsigned_type_node)
4403 name = "complex unsigned int";
4404 else if (component_type == long_integer_type_node)
4405 name = "complex long int";
4406 else if (component_type == long_unsigned_type_node)
4407 name = "complex long unsigned int";
4408 else if (component_type == long_long_integer_type_node)
4409 name = "complex long long int";
4410 else if (component_type == long_long_unsigned_type_node)
4411 name = "complex long long unsigned int";
4416 TYPE_NAME (t) = get_identifier (name);
4419 return build_qualified_type (t, TYPE_QUALS (component_type));
4422 /* Return OP, stripped of any conversions to wider types as much as is safe.
4423 Converting the value back to OP's type makes a value equivalent to OP.
4425 If FOR_TYPE is nonzero, we return a value which, if converted to
4426 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
4428 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
4429 narrowest type that can hold the value, even if they don't exactly fit.
4430 Otherwise, bit-field references are changed to a narrower type
4431 only if they can be fetched directly from memory in that type.
4433 OP must have integer, real or enumeral type. Pointers are not allowed!
4435 There are some cases where the obvious value we could return
4436 would regenerate to OP if converted to OP's type,
4437 but would not extend like OP to wider types.
4438 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
4439 For example, if OP is (unsigned short)(signed char)-1,
4440 we avoid returning (signed char)-1 if FOR_TYPE is int,
4441 even though extending that to an unsigned short would regenerate OP,
4442 since the result of extending (signed char)-1 to (int)
4443 is different from (int) OP. */
4446 get_unwidened (tree op, tree for_type)
4448 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
4449 tree type = TREE_TYPE (op);
4451 = TYPE_PRECISION (for_type != 0 ? for_type : type);
4453 = (for_type != 0 && for_type != type
4454 && final_prec > TYPE_PRECISION (type)
4455 && TYPE_UNSIGNED (type));
4458 while (TREE_CODE (op) == NOP_EXPR)
4461 = TYPE_PRECISION (TREE_TYPE (op))
4462 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0)));
4464 /* Truncations are many-one so cannot be removed.
4465 Unless we are later going to truncate down even farther. */
4467 && final_prec > TYPE_PRECISION (TREE_TYPE (op)))
4470 /* See what's inside this conversion. If we decide to strip it,
4472 op = TREE_OPERAND (op, 0);
4474 /* If we have not stripped any zero-extensions (uns is 0),
4475 we can strip any kind of extension.
4476 If we have previously stripped a zero-extension,
4477 only zero-extensions can safely be stripped.
4478 Any extension can be stripped if the bits it would produce
4479 are all going to be discarded later by truncating to FOR_TYPE. */
4483 if (! uns || final_prec <= TYPE_PRECISION (TREE_TYPE (op)))
4485 /* TYPE_UNSIGNED says whether this is a zero-extension.
4486 Let's avoid computing it if it does not affect WIN
4487 and if UNS will not be needed again. */
4488 if ((uns || TREE_CODE (op) == NOP_EXPR)
4489 && TYPE_UNSIGNED (TREE_TYPE (op)))
4497 if (TREE_CODE (op) == COMPONENT_REF
4498 /* Since type_for_size always gives an integer type. */
4499 && TREE_CODE (type) != REAL_TYPE
4500 /* Don't crash if field not laid out yet. */
4501 && DECL_SIZE (TREE_OPERAND (op, 1)) != 0
4502 && host_integerp (DECL_SIZE (TREE_OPERAND (op, 1)), 1))
4504 unsigned int innerprec
4505 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op, 1)), 1);
4506 int unsignedp = (DECL_UNSIGNED (TREE_OPERAND (op, 1))
4507 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op, 1))));
4508 type = lang_hooks.types.type_for_size (innerprec, unsignedp);
4510 /* We can get this structure field in the narrowest type it fits in.
4511 If FOR_TYPE is 0, do this only for a field that matches the
4512 narrower type exactly and is aligned for it
4513 The resulting extension to its nominal type (a fullword type)
4514 must fit the same conditions as for other extensions. */
4517 && INT_CST_LT_UNSIGNED (TYPE_SIZE (type), TYPE_SIZE (TREE_TYPE (op)))
4518 && (for_type || ! DECL_BIT_FIELD (TREE_OPERAND (op, 1)))
4519 && (! uns || final_prec <= innerprec || unsignedp))
4521 win = build3 (COMPONENT_REF, type, TREE_OPERAND (op, 0),
4522 TREE_OPERAND (op, 1), NULL_TREE);
4523 TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op);
4524 TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op);
4531 /* Return OP or a simpler expression for a narrower value
4532 which can be sign-extended or zero-extended to give back OP.
4533 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
4534 or 0 if the value should be sign-extended. */
4537 get_narrower (tree op, int *unsignedp_ptr)
4542 bool integral_p = INTEGRAL_TYPE_P (TREE_TYPE (op));
4544 while (TREE_CODE (op) == NOP_EXPR)
4547 = (TYPE_PRECISION (TREE_TYPE (op))
4548 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0))));
4550 /* Truncations are many-one so cannot be removed. */
4554 /* See what's inside this conversion. If we decide to strip it,
4559 op = TREE_OPERAND (op, 0);
4560 /* An extension: the outermost one can be stripped,
4561 but remember whether it is zero or sign extension. */
4563 uns = TYPE_UNSIGNED (TREE_TYPE (op));
4564 /* Otherwise, if a sign extension has been stripped,
4565 only sign extensions can now be stripped;
4566 if a zero extension has been stripped, only zero-extensions. */
4567 else if (uns != TYPE_UNSIGNED (TREE_TYPE (op)))
4571 else /* bitschange == 0 */
4573 /* A change in nominal type can always be stripped, but we must
4574 preserve the unsignedness. */
4576 uns = TYPE_UNSIGNED (TREE_TYPE (op));
4578 op = TREE_OPERAND (op, 0);
4579 /* Keep trying to narrow, but don't assign op to win if it
4580 would turn an integral type into something else. */
4581 if (INTEGRAL_TYPE_P (TREE_TYPE (op)) != integral_p)
4588 if (TREE_CODE (op) == COMPONENT_REF
4589 /* Since type_for_size always gives an integer type. */
4590 && TREE_CODE (TREE_TYPE (op)) != REAL_TYPE
4591 /* Ensure field is laid out already. */
4592 && DECL_SIZE (TREE_OPERAND (op, 1)) != 0
4593 && host_integerp (DECL_SIZE (TREE_OPERAND (op, 1)), 1))
4595 unsigned HOST_WIDE_INT innerprec
4596 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op, 1)), 1);
4597 int unsignedp = (DECL_UNSIGNED (TREE_OPERAND (op, 1))
4598 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op, 1))));
4599 tree type = lang_hooks.types.type_for_size (innerprec, unsignedp);
4601 /* We can get this structure field in a narrower type that fits it,
4602 but the resulting extension to its nominal type (a fullword type)
4603 must satisfy the same conditions as for other extensions.
4605 Do this only for fields that are aligned (not bit-fields),
4606 because when bit-field insns will be used there is no
4607 advantage in doing this. */
4609 if (innerprec < TYPE_PRECISION (TREE_TYPE (op))
4610 && ! DECL_BIT_FIELD (TREE_OPERAND (op, 1))
4611 && (first || uns == DECL_UNSIGNED (TREE_OPERAND (op, 1)))
4615 uns = DECL_UNSIGNED (TREE_OPERAND (op, 1));
4616 win = build3 (COMPONENT_REF, type, TREE_OPERAND (op, 0),
4617 TREE_OPERAND (op, 1), NULL_TREE);
4618 TREE_SIDE_EFFECTS (win) = TREE_SIDE_EFFECTS (op);
4619 TREE_THIS_VOLATILE (win) = TREE_THIS_VOLATILE (op);
4622 *unsignedp_ptr = uns;
4626 /* Nonzero if integer constant C has a value that is permissible
4627 for type TYPE (an INTEGER_TYPE). */
4630 int_fits_type_p (tree c, tree type)
4632 tree type_low_bound = TYPE_MIN_VALUE (type);
4633 tree type_high_bound = TYPE_MAX_VALUE (type);
4634 int ok_for_low_bound, ok_for_high_bound;
4636 /* Perform some generic filtering first, which may allow making a decision
4637 even if the bounds are not constant. First, negative integers never fit
4638 in unsigned types, */
4639 if ((TYPE_UNSIGNED (type) && tree_int_cst_sgn (c) < 0)
4640 /* Also, unsigned integers with top bit set never fit signed types. */
4641 || (! TYPE_UNSIGNED (type)
4642 && TYPE_UNSIGNED (TREE_TYPE (c)) && tree_int_cst_msb (c)))
4645 /* If at least one bound of the type is a constant integer, we can check
4646 ourselves and maybe make a decision. If no such decision is possible, but
4647 this type is a subtype, try checking against that. Otherwise, use
4648 force_fit_type, which checks against the precision.
4650 Compute the status for each possibly constant bound, and return if we see
4651 one does not match. Use ok_for_xxx_bound for this purpose, assigning -1
4652 for "unknown if constant fits", 0 for "constant known *not* to fit" and 1
4653 for "constant known to fit". */
4655 ok_for_low_bound = -1;
4656 ok_for_high_bound = -1;
4658 /* Check if C >= type_low_bound. */
4659 if (type_low_bound && TREE_CODE (type_low_bound) == INTEGER_CST)
4661 ok_for_low_bound = ! tree_int_cst_lt (c, type_low_bound);
4662 if (! ok_for_low_bound)
4666 /* Check if c <= type_high_bound. */
4667 if (type_high_bound && TREE_CODE (type_high_bound) == INTEGER_CST)
4669 ok_for_high_bound = ! tree_int_cst_lt (type_high_bound, c);
4670 if (! ok_for_high_bound)
4674 /* If the constant fits both bounds, the result is known. */
4675 if (ok_for_low_bound == 1 && ok_for_high_bound == 1)
4678 /* If we haven't been able to decide at this point, there nothing more we
4679 can check ourselves here. Look at the base type if we have one. */
4680 else if (TREE_CODE (type) == INTEGER_TYPE && TREE_TYPE (type) != 0)
4681 return int_fits_type_p (c, TREE_TYPE (type));
4683 /* Or to force_fit_type, if nothing else. */
4687 TREE_TYPE (c) = type;
4688 return !force_fit_type (c, 0);
4692 /* Subprogram of following function. Called by walk_tree.
4694 Return *TP if it is an automatic variable or parameter of the
4695 function passed in as DATA. */
4698 find_var_from_fn (tree *tp, int *walk_subtrees, void *data)
4700 tree fn = (tree) data;
4705 else if (DECL_P (*tp) && lang_hooks.tree_inlining.auto_var_in_fn_p (*tp, fn))
4711 /* Returns true if T is, contains, or refers to a type with variable
4712 size. If FN is nonzero, only return true if a modifier of the type
4713 or position of FN is a variable or parameter inside FN.
4715 This concept is more general than that of C99 'variably modified types':
4716 in C99, a struct type is never variably modified because a VLA may not
4717 appear as a structure member. However, in GNU C code like:
4719 struct S { int i[f()]; };
4721 is valid, and other languages may define similar constructs. */
4724 variably_modified_type_p (tree type, tree fn)
4728 /* Test if T is either variable (if FN is zero) or an expression containing
4729 a variable in FN. */
4730 #define RETURN_TRUE_IF_VAR(T) \
4731 do { tree _t = (T); \
4732 if (_t && _t != error_mark_node && TREE_CODE (_t) != INTEGER_CST \
4733 && (!fn || walk_tree (&_t, find_var_from_fn, fn, NULL))) \
4734 return true; } while (0)
4736 if (type == error_mark_node)
4739 /* If TYPE itself has variable size, it is variably modified.
4741 We do not yet have a representation of the C99 '[*]' syntax.
4742 When a representation is chosen, this function should be modified
4743 to test for that case as well. */
4744 RETURN_TRUE_IF_VAR (TYPE_SIZE (type));
4745 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT(type));
4747 switch (TREE_CODE (type))
4750 case REFERENCE_TYPE:
4754 if (variably_modified_type_p (TREE_TYPE (type), fn))
4760 /* If TYPE is a function type, it is variably modified if any of the
4761 parameters or the return type are variably modified. */
4762 if (variably_modified_type_p (TREE_TYPE (type), fn))
4765 for (t = TYPE_ARG_TYPES (type);
4766 t && t != void_list_node;
4768 if (variably_modified_type_p (TREE_VALUE (t), fn))
4777 /* Scalar types are variably modified if their end points
4779 RETURN_TRUE_IF_VAR (TYPE_MIN_VALUE (type));
4780 RETURN_TRUE_IF_VAR (TYPE_MAX_VALUE (type));
4785 case QUAL_UNION_TYPE:
4786 /* We can't see if any of the field are variably-modified by the
4787 definition we normally use, since that would produce infinite
4788 recursion via pointers. */
4789 /* This is variably modified if some field's type is. */
4790 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
4791 if (TREE_CODE (t) == FIELD_DECL)
4793 RETURN_TRUE_IF_VAR (DECL_FIELD_OFFSET (t));
4794 RETURN_TRUE_IF_VAR (DECL_SIZE (t));
4795 RETURN_TRUE_IF_VAR (DECL_SIZE_UNIT (t));
4797 if (TREE_CODE (type) == QUAL_UNION_TYPE)
4798 RETURN_TRUE_IF_VAR (DECL_QUALIFIER (t));
4806 /* The current language may have other cases to check, but in general,
4807 all other types are not variably modified. */
4808 return lang_hooks.tree_inlining.var_mod_type_p (type, fn);
4810 #undef RETURN_TRUE_IF_VAR
4813 /* Given a DECL or TYPE, return the scope in which it was declared, or
4814 NULL_TREE if there is no containing scope. */
4817 get_containing_scope (tree t)
4819 return (TYPE_P (t) ? TYPE_CONTEXT (t) : DECL_CONTEXT (t));
4822 /* Return the innermost context enclosing DECL that is
4823 a FUNCTION_DECL, or zero if none. */
4826 decl_function_context (tree decl)
4830 if (TREE_CODE (decl) == ERROR_MARK)
4833 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
4834 where we look up the function at runtime. Such functions always take
4835 a first argument of type 'pointer to real context'.
4837 C++ should really be fixed to use DECL_CONTEXT for the real context,
4838 and use something else for the "virtual context". */
4839 else if (TREE_CODE (decl) == FUNCTION_DECL && DECL_VINDEX (decl))
4842 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)))));
4844 context = DECL_CONTEXT (decl);
4846 while (context && TREE_CODE (context) != FUNCTION_DECL)
4848 if (TREE_CODE (context) == BLOCK)
4849 context = BLOCK_SUPERCONTEXT (context);
4851 context = get_containing_scope (context);
4857 /* Return the innermost context enclosing DECL that is
4858 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
4859 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
4862 decl_type_context (tree decl)
4864 tree context = DECL_CONTEXT (decl);
4867 switch (TREE_CODE (context))
4869 case NAMESPACE_DECL:
4870 case TRANSLATION_UNIT_DECL:
4875 case QUAL_UNION_TYPE:
4880 context = DECL_CONTEXT (context);
4884 context = BLOCK_SUPERCONTEXT (context);
4894 /* CALL is a CALL_EXPR. Return the declaration for the function
4895 called, or NULL_TREE if the called function cannot be
4899 get_callee_fndecl (tree call)
4903 /* It's invalid to call this function with anything but a
4905 if (TREE_CODE (call) != CALL_EXPR)
4908 /* The first operand to the CALL is the address of the function
4910 addr = TREE_OPERAND (call, 0);
4914 /* If this is a readonly function pointer, extract its initial value. */
4915 if (DECL_P (addr) && TREE_CODE (addr) != FUNCTION_DECL
4916 && TREE_READONLY (addr) && ! TREE_THIS_VOLATILE (addr)
4917 && DECL_INITIAL (addr))
4918 addr = DECL_INITIAL (addr);
4920 /* If the address is just `&f' for some function `f', then we know
4921 that `f' is being called. */
4922 if (TREE_CODE (addr) == ADDR_EXPR
4923 && TREE_CODE (TREE_OPERAND (addr, 0)) == FUNCTION_DECL)
4924 return TREE_OPERAND (addr, 0);
4926 /* We couldn't figure out what was being called. Maybe the front
4927 end has some idea. */
4928 return lang_hooks.lang_get_callee_fndecl (call);
4931 /* Print debugging information about tree nodes generated during the compile,
4932 and any language-specific information. */
4935 dump_tree_statistics (void)
4937 #ifdef GATHER_STATISTICS
4939 int total_nodes, total_bytes;
4942 fprintf (stderr, "\n??? tree nodes created\n\n");
4943 #ifdef GATHER_STATISTICS
4944 fprintf (stderr, "Kind Nodes Bytes\n");
4945 fprintf (stderr, "---------------------------------------\n");
4946 total_nodes = total_bytes = 0;
4947 for (i = 0; i < (int) all_kinds; i++)
4949 fprintf (stderr, "%-20s %7d %10d\n", tree_node_kind_names[i],
4950 tree_node_counts[i], tree_node_sizes[i]);
4951 total_nodes += tree_node_counts[i];
4952 total_bytes += tree_node_sizes[i];
4954 fprintf (stderr, "---------------------------------------\n");
4955 fprintf (stderr, "%-20s %7d %10d\n", "Total", total_nodes, total_bytes);
4956 fprintf (stderr, "---------------------------------------\n");
4957 ssanames_print_statistics ();
4958 phinodes_print_statistics ();
4960 fprintf (stderr, "(No per-node statistics)\n");
4962 print_type_hash_statistics ();
4963 lang_hooks.print_statistics ();
4966 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
4968 /* Generate a crc32 of a string. */
4971 crc32_string (unsigned chksum, const char *string)
4975 unsigned value = *string << 24;
4978 for (ix = 8; ix--; value <<= 1)
4982 feedback = (value ^ chksum) & 0x80000000 ? 0x04c11db7 : 0;
4991 /* P is a string that will be used in a symbol. Mask out any characters
4992 that are not valid in that context. */
4995 clean_symbol_name (char *p)
4999 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
5002 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
5009 /* Generate a name for a function unique to this translation unit.
5010 TYPE is some string to identify the purpose of this function to the
5011 linker or collect2. */
5014 get_file_function_name_long (const char *type)
5020 if (first_global_object_name)
5021 p = first_global_object_name;
5024 /* We don't have anything that we know to be unique to this translation
5025 unit, so use what we do have and throw in some randomness. */
5027 const char *name = weak_global_object_name;
5028 const char *file = main_input_filename;
5033 file = input_filename;
5035 len = strlen (file);
5036 q = alloca (9 * 2 + len + 1);
5037 memcpy (q, file, len + 1);
5038 clean_symbol_name (q);
5040 sprintf (q + len, "_%08X_%08X", crc32_string (0, name),
5041 crc32_string (0, flag_random_seed));
5046 buf = alloca (sizeof (FILE_FUNCTION_FORMAT) + strlen (p) + strlen (type));
5048 /* Set up the name of the file-level functions we may need.
5049 Use a global object (which is already required to be unique over
5050 the program) rather than the file name (which imposes extra
5052 sprintf (buf, FILE_FUNCTION_FORMAT, type, p);
5054 return get_identifier (buf);
5057 /* If KIND=='I', return a suitable global initializer (constructor) name.
5058 If KIND=='D', return a suitable global clean-up (destructor) name. */
5061 get_file_function_name (int kind)
5068 return get_file_function_name_long (p);
5071 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
5072 The result is placed in BUFFER (which has length BIT_SIZE),
5073 with one bit in each char ('\000' or '\001').
5075 If the constructor is constant, NULL_TREE is returned.
5076 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
5079 get_set_constructor_bits (tree init, char *buffer, int bit_size)
5083 HOST_WIDE_INT domain_min
5084 = tree_low_cst (TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (init))), 0);
5085 tree non_const_bits = NULL_TREE;
5087 for (i = 0; i < bit_size; i++)
5090 for (vals = TREE_OPERAND (init, 1);
5091 vals != NULL_TREE; vals = TREE_CHAIN (vals))
5093 if (!host_integerp (TREE_VALUE (vals), 0)
5094 || (TREE_PURPOSE (vals) != NULL_TREE
5095 && !host_integerp (TREE_PURPOSE (vals), 0)))
5097 = tree_cons (TREE_PURPOSE (vals), TREE_VALUE (vals), non_const_bits);
5098 else if (TREE_PURPOSE (vals) != NULL_TREE)
5100 /* Set a range of bits to ones. */
5101 HOST_WIDE_INT lo_index
5102 = tree_low_cst (TREE_PURPOSE (vals), 0) - domain_min;
5103 HOST_WIDE_INT hi_index
5104 = tree_low_cst (TREE_VALUE (vals), 0) - domain_min;
5106 if (lo_index < 0 || lo_index >= bit_size
5107 || hi_index < 0 || hi_index >= bit_size)
5109 for (; lo_index <= hi_index; lo_index++)
5110 buffer[lo_index] = 1;
5114 /* Set a single bit to one. */
5116 = tree_low_cst (TREE_VALUE (vals), 0) - domain_min;
5117 if (index < 0 || index >= bit_size)
5119 error ("invalid initializer for bit string");
5125 return non_const_bits;
5128 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
5129 The result is placed in BUFFER (which is an array of bytes).
5130 If the constructor is constant, NULL_TREE is returned.
5131 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
5134 get_set_constructor_bytes (tree init, unsigned char *buffer, int wd_size)
5137 int set_word_size = BITS_PER_UNIT;
5138 int bit_size = wd_size * set_word_size;
5140 unsigned char *bytep = buffer;
5141 char *bit_buffer = alloca (bit_size);
5142 tree non_const_bits = get_set_constructor_bits (init, bit_buffer, bit_size);
5144 for (i = 0; i < wd_size; i++)
5147 for (i = 0; i < bit_size; i++)
5151 if (BYTES_BIG_ENDIAN)
5152 *bytep |= (1 << (set_word_size - 1 - bit_pos));
5154 *bytep |= 1 << bit_pos;
5157 if (bit_pos >= set_word_size)
5158 bit_pos = 0, bytep++;
5160 return non_const_bits;
5163 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
5165 /* Complain that the tree code of NODE does not match the expected 0
5166 terminated list of trailing codes. FILE, LINE, and FUNCTION are of
5170 tree_check_failed (const tree node, const char *file,
5171 int line, const char *function, ...)
5175 unsigned length = 0;
5178 va_start (args, function);
5179 while ((code = va_arg (args, int)))
5180 length += 4 + strlen (tree_code_name[code]);
5182 va_start (args, function);
5183 buffer = alloca (length);
5185 while ((code = va_arg (args, int)))
5189 strcpy (buffer + length, " or ");
5192 strcpy (buffer + length, tree_code_name[code]);
5193 length += strlen (tree_code_name[code]);
5197 internal_error ("tree check: expected %s, have %s in %s, at %s:%d",
5198 buffer, tree_code_name[TREE_CODE (node)],
5199 function, trim_filename (file), line);
5202 /* Complain that the tree code of NODE does match the expected 0
5203 terminated list of trailing codes. FILE, LINE, and FUNCTION are of
5207 tree_not_check_failed (const tree node, const char *file,
5208 int line, const char *function, ...)
5212 unsigned length = 0;
5215 va_start (args, function);
5216 while ((code = va_arg (args, int)))
5217 length += 4 + strlen (tree_code_name[code]);
5219 va_start (args, function);
5220 buffer = alloca (length);
5222 while ((code = va_arg (args, int)))
5226 strcpy (buffer + length, " or ");
5229 strcpy (buffer + length, tree_code_name[code]);
5230 length += strlen (tree_code_name[code]);
5234 internal_error ("tree check: expected none of %s, have %s in %s, at %s:%d",
5235 buffer, tree_code_name[TREE_CODE (node)],
5236 function, trim_filename (file), line);
5239 /* Similar to tree_check_failed, except that we check for a class of tree
5240 code, given in CL. */
5243 tree_class_check_failed (const tree node, int cl, const char *file,
5244 int line, const char *function)
5247 ("tree check: expected class '%c', have '%c' (%s) in %s, at %s:%d",
5248 cl, TREE_CODE_CLASS (TREE_CODE (node)),
5249 tree_code_name[TREE_CODE (node)], function, trim_filename (file), line);
5252 /* Similar to above, except that the check is for the bounds of a TREE_VEC's
5253 (dynamically sized) vector. */
5256 tree_vec_elt_check_failed (int idx, int len, const char *file, int line,
5257 const char *function)
5260 ("tree check: accessed elt %d of tree_vec with %d elts in %s, at %s:%d",
5261 idx + 1, len, function, trim_filename (file), line);
5264 /* Similar to above, except that the check is for the bounds of a PHI_NODE's
5265 (dynamically sized) vector. */
5268 phi_node_elt_check_failed (int idx, int len, const char *file, int line,
5269 const char *function)
5272 ("tree check: accessed elt %d of phi_node with %d elts in %s, at %s:%d",
5273 idx + 1, len, function, trim_filename (file), line);
5276 /* Similar to above, except that the check is for the bounds of the operand
5277 vector of an expression node. */
5280 tree_operand_check_failed (int idx, enum tree_code code, const char *file,
5281 int line, const char *function)
5284 ("tree check: accessed operand %d of %s with %d operands in %s, at %s:%d",
5285 idx + 1, tree_code_name[code], TREE_CODE_LENGTH (code),
5286 function, trim_filename (file), line);
5288 #endif /* ENABLE_TREE_CHECKING */
5290 /* For a new vector type node T, build the information necessary for
5291 debugging output. */
5294 finish_vector_type (tree t)
5299 tree index = build_int_2 (TYPE_VECTOR_SUBPARTS (t) - 1, 0);
5300 tree array = build_array_type (TREE_TYPE (t),
5301 build_index_type (index));
5302 tree rt = make_node (RECORD_TYPE);
5304 TYPE_FIELDS (rt) = build_decl (FIELD_DECL, get_identifier ("f"), array);
5305 DECL_CONTEXT (TYPE_FIELDS (rt)) = rt;
5307 TYPE_DEBUG_REPRESENTATION_TYPE (t) = rt;
5308 /* In dwarfout.c, type lookup uses TYPE_UID numbers. We want to output
5309 the representation type, and we want to find that die when looking up
5310 the vector type. This is most easily achieved by making the TYPE_UID
5312 TYPE_UID (rt) = TYPE_UID (t);
5317 make_or_reuse_type (unsigned size, int unsignedp)
5319 if (size == INT_TYPE_SIZE)
5320 return unsignedp ? unsigned_type_node : integer_type_node;
5321 if (size == CHAR_TYPE_SIZE)
5322 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
5323 if (size == SHORT_TYPE_SIZE)
5324 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
5325 if (size == LONG_TYPE_SIZE)
5326 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
5327 if (size == LONG_LONG_TYPE_SIZE)
5328 return (unsignedp ? long_long_unsigned_type_node
5329 : long_long_integer_type_node);
5332 return make_unsigned_type (size);
5334 return make_signed_type (size);
5337 /* Create nodes for all integer types (and error_mark_node) using the sizes
5338 of C datatypes. The caller should call set_sizetype soon after calling
5339 this function to select one of the types as sizetype. */
5342 build_common_tree_nodes (int signed_char)
5344 /* This function is called after command line parsing is complete,
5345 but before any DECL nodes should have been created. Therefore,
5346 now is the appropriate time to adjust next_decl_uid so that the
5347 range 0 .. num_in_fnames-1 is reserved for TRANSLATION_UNIT_DECLs. */
5350 next_decl_uid = num_in_fnames;
5352 error_mark_node = make_node (ERROR_MARK);
5353 TREE_TYPE (error_mark_node) = error_mark_node;
5355 initialize_sizetypes ();
5357 /* Define both `signed char' and `unsigned char'. */
5358 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
5359 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
5361 /* Define `char', which is like either `signed char' or `unsigned char'
5362 but not the same as either. */
5365 ? make_signed_type (CHAR_TYPE_SIZE)
5366 : make_unsigned_type (CHAR_TYPE_SIZE));
5368 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
5369 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
5370 integer_type_node = make_signed_type (INT_TYPE_SIZE);
5371 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
5372 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
5373 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
5374 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
5375 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
5377 /* Define a boolean type. This type only represents boolean values but
5378 may be larger than char depending on the value of BOOL_TYPE_SIZE.
5379 Front ends which want to override this size (i.e. Java) can redefine
5380 boolean_type_node before calling build_common_tree_nodes_2. */
5381 boolean_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
5382 TREE_SET_CODE (boolean_type_node, BOOLEAN_TYPE);
5383 TYPE_MAX_VALUE (boolean_type_node) = build_int_2 (1, 0);
5384 TREE_TYPE (TYPE_MAX_VALUE (boolean_type_node)) = boolean_type_node;
5385 TYPE_PRECISION (boolean_type_node) = 1;
5387 /* Fill in the rest of the sized types. Reuse existing type nodes
5389 intQI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (QImode), 0);
5390 intHI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (HImode), 0);
5391 intSI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (SImode), 0);
5392 intDI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (DImode), 0);
5393 intTI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (TImode), 0);
5395 unsigned_intQI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (QImode), 1);
5396 unsigned_intHI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (HImode), 1);
5397 unsigned_intSI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (SImode), 1);
5398 unsigned_intDI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (DImode), 1);
5399 unsigned_intTI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (TImode), 1);
5401 access_public_node = get_identifier ("public");
5402 access_protected_node = get_identifier ("protected");
5403 access_private_node = get_identifier ("private");
5406 /* Call this function after calling build_common_tree_nodes and set_sizetype.
5407 It will create several other common tree nodes. */
5410 build_common_tree_nodes_2 (int short_double)
5412 /* Define these next since types below may used them. */
5413 integer_zero_node = build_int_2 (0, 0);
5414 integer_one_node = build_int_2 (1, 0);
5415 integer_minus_one_node = build_int_2 (-1, -1);
5417 size_zero_node = size_int (0);
5418 size_one_node = size_int (1);
5419 bitsize_zero_node = bitsize_int (0);
5420 bitsize_one_node = bitsize_int (1);
5421 bitsize_unit_node = bitsize_int (BITS_PER_UNIT);
5423 boolean_false_node = TYPE_MIN_VALUE (boolean_type_node);
5424 boolean_true_node = TYPE_MAX_VALUE (boolean_type_node);
5426 void_type_node = make_node (VOID_TYPE);
5427 layout_type (void_type_node);
5429 /* We are not going to have real types in C with less than byte alignment,
5430 so we might as well not have any types that claim to have it. */
5431 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
5432 TYPE_USER_ALIGN (void_type_node) = 0;
5434 null_pointer_node = build_int_2 (0, 0);
5435 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
5436 layout_type (TREE_TYPE (null_pointer_node));
5438 ptr_type_node = build_pointer_type (void_type_node);
5440 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
5441 fileptr_type_node = ptr_type_node;
5443 float_type_node = make_node (REAL_TYPE);
5444 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
5445 layout_type (float_type_node);
5447 double_type_node = make_node (REAL_TYPE);
5449 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
5451 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
5452 layout_type (double_type_node);
5454 long_double_type_node = make_node (REAL_TYPE);
5455 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
5456 layout_type (long_double_type_node);
5458 float_ptr_type_node = build_pointer_type (float_type_node);
5459 double_ptr_type_node = build_pointer_type (double_type_node);
5460 long_double_ptr_type_node = build_pointer_type (long_double_type_node);
5461 integer_ptr_type_node = build_pointer_type (integer_type_node);
5463 complex_integer_type_node = make_node (COMPLEX_TYPE);
5464 TREE_TYPE (complex_integer_type_node) = integer_type_node;
5465 layout_type (complex_integer_type_node);
5467 complex_float_type_node = make_node (COMPLEX_TYPE);
5468 TREE_TYPE (complex_float_type_node) = float_type_node;
5469 layout_type (complex_float_type_node);
5471 complex_double_type_node = make_node (COMPLEX_TYPE);
5472 TREE_TYPE (complex_double_type_node) = double_type_node;
5473 layout_type (complex_double_type_node);
5475 complex_long_double_type_node = make_node (COMPLEX_TYPE);
5476 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
5477 layout_type (complex_long_double_type_node);
5480 tree t = targetm.build_builtin_va_list ();
5482 /* Many back-ends define record types without setting TYPE_NAME.
5483 If we copied the record type here, we'd keep the original
5484 record type without a name. This breaks name mangling. So,
5485 don't copy record types and let c_common_nodes_and_builtins()
5486 declare the type to be __builtin_va_list. */
5487 if (TREE_CODE (t) != RECORD_TYPE)
5488 t = build_type_copy (t);
5490 va_list_type_node = t;
5494 /* HACK. GROSS. This is absolutely disgusting. I wish there was a
5497 If we requested a pointer to a vector, build up the pointers that
5498 we stripped off while looking for the inner type. Similarly for
5499 return values from functions.
5501 The argument TYPE is the top of the chain, and BOTTOM is the
5502 new type which we will point to. */
5505 reconstruct_complex_type (tree type, tree bottom)
5509 if (POINTER_TYPE_P (type))
5511 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
5512 outer = build_pointer_type (inner);
5514 else if (TREE_CODE (type) == ARRAY_TYPE)
5516 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
5517 outer = build_array_type (inner, TYPE_DOMAIN (type));
5519 else if (TREE_CODE (type) == FUNCTION_TYPE)
5521 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
5522 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
5524 else if (TREE_CODE (type) == METHOD_TYPE)
5526 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
5527 outer = build_method_type_directly (TYPE_METHOD_BASETYPE (type),
5529 TYPE_ARG_TYPES (type));
5534 TYPE_READONLY (outer) = TYPE_READONLY (type);
5535 TYPE_VOLATILE (outer) = TYPE_VOLATILE (type);
5540 /* Returns a vector tree node given a vector mode and inner type. */
5542 build_vector_type_for_mode (tree innertype, enum machine_mode mode)
5545 t = make_node (VECTOR_TYPE);
5546 TREE_TYPE (t) = innertype;
5547 TYPE_MODE (t) = mode;
5548 finish_vector_type (t);
5552 /* Similarly, but takes inner type and units. */
5555 build_vector_type (tree innertype, int nunits)
5557 enum machine_mode innermode = TYPE_MODE (innertype);
5558 enum machine_mode mode;
5560 if (GET_MODE_CLASS (innermode) == MODE_FLOAT)
5561 mode = MIN_MODE_VECTOR_FLOAT;
5563 mode = MIN_MODE_VECTOR_INT;
5565 for (; mode != VOIDmode ; mode = GET_MODE_WIDER_MODE (mode))
5566 if (GET_MODE_NUNITS (mode) == nunits && GET_MODE_INNER (mode) == innermode)
5567 return build_vector_type_for_mode (innertype, mode);
5572 /* Given an initializer INIT, return TRUE if INIT is zero or some
5573 aggregate of zeros. Otherwise return FALSE. */
5575 initializer_zerop (tree init)
5581 switch (TREE_CODE (init))
5584 return integer_zerop (init);
5587 /* ??? Note that this is not correct for C4X float formats. There,
5588 a bit pattern of all zeros is 1.0; 0.0 is encoded with the most
5589 negative exponent. */
5590 return real_zerop (init)
5591 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (init));
5594 return integer_zerop (init)
5595 || (real_zerop (init)
5596 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_REALPART (init)))
5597 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_IMAGPART (init))));
5600 for (elt = TREE_VECTOR_CST_ELTS (init); elt; elt = TREE_CHAIN (elt))
5601 if (!initializer_zerop (TREE_VALUE (elt)))
5606 elt = CONSTRUCTOR_ELTS (init);
5607 if (elt == NULL_TREE)
5610 /* A set is empty only if it has no elements. */
5611 if (TREE_CODE (TREE_TYPE (init)) == SET_TYPE)
5614 for (; elt ; elt = TREE_CHAIN (elt))
5615 if (! initializer_zerop (TREE_VALUE (elt)))
5625 add_var_to_bind_expr (tree bind_expr, tree var)
5627 BIND_EXPR_VARS (bind_expr)
5628 = chainon (BIND_EXPR_VARS (bind_expr), var);
5629 if (BIND_EXPR_BLOCK (bind_expr))
5630 BLOCK_VARS (BIND_EXPR_BLOCK (bind_expr))
5631 = BIND_EXPR_VARS (bind_expr);
5634 /* Build an empty statement. */
5637 build_empty_stmt (void)
5639 return build1 (NOP_EXPR, void_type_node, size_zero_node);
5643 /* Return true if T (assumed to be a DECL) must be assigned a memory
5647 needs_to_live_in_memory (tree t)
5649 return (DECL_NEEDS_TO_LIVE_IN_MEMORY_INTERNAL (t)
5651 || DECL_EXTERNAL (t)
5652 || DECL_NONLOCAL (t)
5653 || (TREE_CODE (t) == RESULT_DECL
5654 && aggregate_value_p (t, current_function_decl))
5655 || decl_function_context (t) != current_function_decl);
5658 #include "gt-tree.h"