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, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
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"
46 #include "langhooks.h"
47 #include "tree-inline.h"
48 #include "tree-iterator.h"
49 #include "basic-block.h"
50 #include "tree-flow.h"
52 #include "pointer-set.h"
53 #include "tree-pass.h"
54 #include "langhooks-def.h"
55 #include "diagnostic.h"
56 #include "tree-diagnostic.h"
57 #include "tree-pretty-print.h"
64 /* Tree code classes. */
66 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
67 #define END_OF_BASE_TREE_CODES tcc_exceptional,
69 const enum tree_code_class tree_code_type[] = {
70 #include "all-tree.def"
74 #undef END_OF_BASE_TREE_CODES
76 /* Table indexed by tree code giving number of expression
77 operands beyond the fixed part of the node structure.
78 Not used for types or decls. */
80 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
81 #define END_OF_BASE_TREE_CODES 0,
83 const unsigned char tree_code_length[] = {
84 #include "all-tree.def"
88 #undef END_OF_BASE_TREE_CODES
90 /* Names of tree components.
91 Used for printing out the tree and error messages. */
92 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
93 #define END_OF_BASE_TREE_CODES "@dummy",
95 const char *const tree_code_name[] = {
96 #include "all-tree.def"
100 #undef END_OF_BASE_TREE_CODES
102 /* Each tree code class has an associated string representation.
103 These must correspond to the tree_code_class entries. */
105 const char *const tree_code_class_strings[] =
120 /* obstack.[ch] explicitly declined to prototype this. */
121 extern int _obstack_allocated_p (struct obstack *h, void *obj);
123 #ifdef GATHER_STATISTICS
124 /* Statistics-gathering stuff. */
126 int tree_node_counts[(int) all_kinds];
127 int tree_node_sizes[(int) all_kinds];
129 /* Keep in sync with tree.h:enum tree_node_kind. */
130 static const char * const tree_node_kind_names[] = {
148 #endif /* GATHER_STATISTICS */
150 /* Unique id for next decl created. */
151 static GTY(()) int next_decl_uid;
152 /* Unique id for next type created. */
153 static GTY(()) int next_type_uid = 1;
154 /* Unique id for next debug decl created. Use negative numbers,
155 to catch erroneous uses. */
156 static GTY(()) int next_debug_decl_uid;
158 /* Since we cannot rehash a type after it is in the table, we have to
159 keep the hash code. */
161 struct GTY(()) type_hash {
166 /* Initial size of the hash table (rounded to next prime). */
167 #define TYPE_HASH_INITIAL_SIZE 1000
169 /* Now here is the hash table. When recording a type, it is added to
170 the slot whose index is the hash code. Note that the hash table is
171 used for several kinds of types (function types, array types and
172 array index range types, for now). While all these live in the
173 same table, they are completely independent, and the hash code is
174 computed differently for each of these. */
176 static GTY ((if_marked ("type_hash_marked_p"), param_is (struct type_hash)))
177 htab_t type_hash_table;
179 /* Hash table and temporary node for larger integer const values. */
180 static GTY (()) tree int_cst_node;
181 static GTY ((if_marked ("ggc_marked_p"), param_is (union tree_node)))
182 htab_t int_cst_hash_table;
184 /* Hash table for optimization flags and target option flags. Use the same
185 hash table for both sets of options. Nodes for building the current
186 optimization and target option nodes. The assumption is most of the time
187 the options created will already be in the hash table, so we avoid
188 allocating and freeing up a node repeatably. */
189 static GTY (()) tree cl_optimization_node;
190 static GTY (()) tree cl_target_option_node;
191 static GTY ((if_marked ("ggc_marked_p"), param_is (union tree_node)))
192 htab_t cl_option_hash_table;
194 /* General tree->tree mapping structure for use in hash tables. */
197 static GTY ((if_marked ("tree_decl_map_marked_p"), param_is (struct tree_decl_map)))
198 htab_t debug_expr_for_decl;
200 static GTY ((if_marked ("tree_decl_map_marked_p"), param_is (struct tree_decl_map)))
201 htab_t value_expr_for_decl;
203 static GTY ((if_marked ("tree_priority_map_marked_p"),
204 param_is (struct tree_priority_map)))
205 htab_t init_priority_for_decl;
207 static void set_type_quals (tree, int);
208 static int type_hash_eq (const void *, const void *);
209 static hashval_t type_hash_hash (const void *);
210 static hashval_t int_cst_hash_hash (const void *);
211 static int int_cst_hash_eq (const void *, const void *);
212 static hashval_t cl_option_hash_hash (const void *);
213 static int cl_option_hash_eq (const void *, const void *);
214 static void print_type_hash_statistics (void);
215 static void print_debug_expr_statistics (void);
216 static void print_value_expr_statistics (void);
217 static int type_hash_marked_p (const void *);
218 static unsigned int type_hash_list (const_tree, hashval_t);
219 static unsigned int attribute_hash_list (const_tree, hashval_t);
221 tree global_trees[TI_MAX];
222 tree integer_types[itk_none];
224 unsigned char tree_contains_struct[MAX_TREE_CODES][64];
226 /* Number of operands for each OpenMP clause. */
227 unsigned const char omp_clause_num_ops[] =
229 0, /* OMP_CLAUSE_ERROR */
230 1, /* OMP_CLAUSE_PRIVATE */
231 1, /* OMP_CLAUSE_SHARED */
232 1, /* OMP_CLAUSE_FIRSTPRIVATE */
233 2, /* OMP_CLAUSE_LASTPRIVATE */
234 4, /* OMP_CLAUSE_REDUCTION */
235 1, /* OMP_CLAUSE_COPYIN */
236 1, /* OMP_CLAUSE_COPYPRIVATE */
237 1, /* OMP_CLAUSE_IF */
238 1, /* OMP_CLAUSE_NUM_THREADS */
239 1, /* OMP_CLAUSE_SCHEDULE */
240 0, /* OMP_CLAUSE_NOWAIT */
241 0, /* OMP_CLAUSE_ORDERED */
242 0, /* OMP_CLAUSE_DEFAULT */
243 3, /* OMP_CLAUSE_COLLAPSE */
244 0 /* OMP_CLAUSE_UNTIED */
247 const char * const omp_clause_code_name[] =
268 /* Return the tree node structure used by tree code CODE. */
270 static inline enum tree_node_structure_enum
271 tree_node_structure_for_code (enum tree_code code)
273 switch (TREE_CODE_CLASS (code))
275 case tcc_declaration:
280 return TS_FIELD_DECL;
286 return TS_LABEL_DECL;
288 return TS_RESULT_DECL;
289 case DEBUG_EXPR_DECL:
292 return TS_CONST_DECL;
296 return TS_FUNCTION_DECL;
298 return TS_DECL_NON_COMMON;
311 default: /* tcc_constant and tcc_exceptional */
316 /* tcc_constant cases. */
317 case INTEGER_CST: return TS_INT_CST;
318 case REAL_CST: return TS_REAL_CST;
319 case FIXED_CST: return TS_FIXED_CST;
320 case COMPLEX_CST: return TS_COMPLEX;
321 case VECTOR_CST: return TS_VECTOR;
322 case STRING_CST: return TS_STRING;
323 /* tcc_exceptional cases. */
324 case ERROR_MARK: return TS_COMMON;
325 case IDENTIFIER_NODE: return TS_IDENTIFIER;
326 case TREE_LIST: return TS_LIST;
327 case TREE_VEC: return TS_VEC;
328 case SSA_NAME: return TS_SSA_NAME;
329 case PLACEHOLDER_EXPR: return TS_COMMON;
330 case STATEMENT_LIST: return TS_STATEMENT_LIST;
331 case BLOCK: return TS_BLOCK;
332 case CONSTRUCTOR: return TS_CONSTRUCTOR;
333 case TREE_BINFO: return TS_BINFO;
334 case OMP_CLAUSE: return TS_OMP_CLAUSE;
335 case OPTIMIZATION_NODE: return TS_OPTIMIZATION;
336 case TARGET_OPTION_NODE: return TS_TARGET_OPTION;
344 /* Initialize tree_contains_struct to describe the hierarchy of tree
348 initialize_tree_contains_struct (void)
352 #define MARK_TS_BASE(C) \
354 tree_contains_struct[C][TS_BASE] = 1; \
357 #define MARK_TS_COMMON(C) \
360 tree_contains_struct[C][TS_COMMON] = 1; \
363 #define MARK_TS_DECL_MINIMAL(C) \
365 MARK_TS_COMMON (C); \
366 tree_contains_struct[C][TS_DECL_MINIMAL] = 1; \
369 #define MARK_TS_DECL_COMMON(C) \
371 MARK_TS_DECL_MINIMAL (C); \
372 tree_contains_struct[C][TS_DECL_COMMON] = 1; \
375 #define MARK_TS_DECL_WRTL(C) \
377 MARK_TS_DECL_COMMON (C); \
378 tree_contains_struct[C][TS_DECL_WRTL] = 1; \
381 #define MARK_TS_DECL_WITH_VIS(C) \
383 MARK_TS_DECL_WRTL (C); \
384 tree_contains_struct[C][TS_DECL_WITH_VIS] = 1; \
387 #define MARK_TS_DECL_NON_COMMON(C) \
389 MARK_TS_DECL_WITH_VIS (C); \
390 tree_contains_struct[C][TS_DECL_NON_COMMON] = 1; \
393 for (i = ERROR_MARK; i < LAST_AND_UNUSED_TREE_CODE; i++)
396 enum tree_node_structure_enum ts_code;
398 code = (enum tree_code) i;
399 ts_code = tree_node_structure_for_code (code);
401 /* Mark the TS structure itself. */
402 tree_contains_struct[code][ts_code] = 1;
404 /* Mark all the structures that TS is derived from. */
418 case TS_DECL_MINIMAL:
426 case TS_STATEMENT_LIST:
429 case TS_OPTIMIZATION:
430 case TS_TARGET_OPTION:
431 MARK_TS_COMMON (code);
435 MARK_TS_DECL_MINIMAL (code);
439 MARK_TS_DECL_COMMON (code);
442 case TS_DECL_NON_COMMON:
443 MARK_TS_DECL_WITH_VIS (code);
446 case TS_DECL_WITH_VIS:
451 MARK_TS_DECL_WRTL (code);
455 MARK_TS_DECL_COMMON (code);
459 MARK_TS_DECL_WITH_VIS (code);
463 case TS_FUNCTION_DECL:
464 MARK_TS_DECL_NON_COMMON (code);
472 /* Basic consistency checks for attributes used in fold. */
473 gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_NON_COMMON]);
474 gcc_assert (tree_contains_struct[TRANSLATION_UNIT_DECL][TS_DECL_NON_COMMON]);
475 gcc_assert (tree_contains_struct[TYPE_DECL][TS_DECL_NON_COMMON]);
476 gcc_assert (tree_contains_struct[CONST_DECL][TS_DECL_COMMON]);
477 gcc_assert (tree_contains_struct[VAR_DECL][TS_DECL_COMMON]);
478 gcc_assert (tree_contains_struct[PARM_DECL][TS_DECL_COMMON]);
479 gcc_assert (tree_contains_struct[RESULT_DECL][TS_DECL_COMMON]);
480 gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_COMMON]);
481 gcc_assert (tree_contains_struct[TYPE_DECL][TS_DECL_COMMON]);
482 gcc_assert (tree_contains_struct[TRANSLATION_UNIT_DECL][TS_DECL_COMMON]);
483 gcc_assert (tree_contains_struct[LABEL_DECL][TS_DECL_COMMON]);
484 gcc_assert (tree_contains_struct[FIELD_DECL][TS_DECL_COMMON]);
485 gcc_assert (tree_contains_struct[CONST_DECL][TS_DECL_WRTL]);
486 gcc_assert (tree_contains_struct[VAR_DECL][TS_DECL_WRTL]);
487 gcc_assert (tree_contains_struct[PARM_DECL][TS_DECL_WRTL]);
488 gcc_assert (tree_contains_struct[RESULT_DECL][TS_DECL_WRTL]);
489 gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_WRTL]);
490 gcc_assert (tree_contains_struct[LABEL_DECL][TS_DECL_WRTL]);
491 gcc_assert (tree_contains_struct[CONST_DECL][TS_DECL_MINIMAL]);
492 gcc_assert (tree_contains_struct[VAR_DECL][TS_DECL_MINIMAL]);
493 gcc_assert (tree_contains_struct[PARM_DECL][TS_DECL_MINIMAL]);
494 gcc_assert (tree_contains_struct[RESULT_DECL][TS_DECL_MINIMAL]);
495 gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_MINIMAL]);
496 gcc_assert (tree_contains_struct[TYPE_DECL][TS_DECL_MINIMAL]);
497 gcc_assert (tree_contains_struct[TRANSLATION_UNIT_DECL][TS_DECL_MINIMAL]);
498 gcc_assert (tree_contains_struct[LABEL_DECL][TS_DECL_MINIMAL]);
499 gcc_assert (tree_contains_struct[FIELD_DECL][TS_DECL_MINIMAL]);
500 gcc_assert (tree_contains_struct[VAR_DECL][TS_DECL_WITH_VIS]);
501 gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_WITH_VIS]);
502 gcc_assert (tree_contains_struct[TYPE_DECL][TS_DECL_WITH_VIS]);
503 gcc_assert (tree_contains_struct[TRANSLATION_UNIT_DECL][TS_DECL_WITH_VIS]);
504 gcc_assert (tree_contains_struct[VAR_DECL][TS_VAR_DECL]);
505 gcc_assert (tree_contains_struct[FIELD_DECL][TS_FIELD_DECL]);
506 gcc_assert (tree_contains_struct[PARM_DECL][TS_PARM_DECL]);
507 gcc_assert (tree_contains_struct[LABEL_DECL][TS_LABEL_DECL]);
508 gcc_assert (tree_contains_struct[RESULT_DECL][TS_RESULT_DECL]);
509 gcc_assert (tree_contains_struct[CONST_DECL][TS_CONST_DECL]);
510 gcc_assert (tree_contains_struct[TYPE_DECL][TS_TYPE_DECL]);
511 gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_FUNCTION_DECL]);
512 gcc_assert (tree_contains_struct[IMPORTED_DECL][TS_DECL_MINIMAL]);
513 gcc_assert (tree_contains_struct[IMPORTED_DECL][TS_DECL_COMMON]);
516 #undef MARK_TS_COMMON
517 #undef MARK_TS_DECL_MINIMAL
518 #undef MARK_TS_DECL_COMMON
519 #undef MARK_TS_DECL_WRTL
520 #undef MARK_TS_DECL_WITH_VIS
521 #undef MARK_TS_DECL_NON_COMMON
530 /* Initialize the hash table of types. */
531 type_hash_table = htab_create_ggc (TYPE_HASH_INITIAL_SIZE, type_hash_hash,
534 debug_expr_for_decl = htab_create_ggc (512, tree_decl_map_hash,
535 tree_decl_map_eq, 0);
537 value_expr_for_decl = htab_create_ggc (512, tree_decl_map_hash,
538 tree_decl_map_eq, 0);
539 init_priority_for_decl = htab_create_ggc (512, tree_priority_map_hash,
540 tree_priority_map_eq, 0);
542 int_cst_hash_table = htab_create_ggc (1024, int_cst_hash_hash,
543 int_cst_hash_eq, NULL);
545 int_cst_node = make_node (INTEGER_CST);
547 cl_option_hash_table = htab_create_ggc (64, cl_option_hash_hash,
548 cl_option_hash_eq, NULL);
550 cl_optimization_node = make_node (OPTIMIZATION_NODE);
551 cl_target_option_node = make_node (TARGET_OPTION_NODE);
553 /* Initialize the tree_contains_struct array. */
554 initialize_tree_contains_struct ();
555 lang_hooks.init_ts ();
559 /* The name of the object as the assembler will see it (but before any
560 translations made by ASM_OUTPUT_LABELREF). Often this is the same
561 as DECL_NAME. It is an IDENTIFIER_NODE. */
563 decl_assembler_name (tree decl)
565 if (!DECL_ASSEMBLER_NAME_SET_P (decl))
566 lang_hooks.set_decl_assembler_name (decl);
567 return DECL_WITH_VIS_CHECK (decl)->decl_with_vis.assembler_name;
570 /* Compare ASMNAME with the DECL_ASSEMBLER_NAME of DECL. */
573 decl_assembler_name_equal (tree decl, const_tree asmname)
575 tree decl_asmname = DECL_ASSEMBLER_NAME (decl);
576 const char *decl_str;
577 const char *asmname_str;
580 if (decl_asmname == asmname)
583 decl_str = IDENTIFIER_POINTER (decl_asmname);
584 asmname_str = IDENTIFIER_POINTER (asmname);
587 /* If the target assembler name was set by the user, things are trickier.
588 We have a leading '*' to begin with. After that, it's arguable what
589 is the correct thing to do with -fleading-underscore. Arguably, we've
590 historically been doing the wrong thing in assemble_alias by always
591 printing the leading underscore. Since we're not changing that, make
592 sure user_label_prefix follows the '*' before matching. */
593 if (decl_str[0] == '*')
595 size_t ulp_len = strlen (user_label_prefix);
601 else if (strncmp (decl_str, user_label_prefix, ulp_len) == 0)
602 decl_str += ulp_len, test=true;
606 if (asmname_str[0] == '*')
608 size_t ulp_len = strlen (user_label_prefix);
614 else if (strncmp (asmname_str, user_label_prefix, ulp_len) == 0)
615 asmname_str += ulp_len, test=true;
622 return strcmp (decl_str, asmname_str) == 0;
625 /* Hash asmnames ignoring the user specified marks. */
628 decl_assembler_name_hash (const_tree asmname)
630 if (IDENTIFIER_POINTER (asmname)[0] == '*')
632 const char *decl_str = IDENTIFIER_POINTER (asmname) + 1;
633 size_t ulp_len = strlen (user_label_prefix);
637 else if (strncmp (decl_str, user_label_prefix, ulp_len) == 0)
640 return htab_hash_string (decl_str);
643 return htab_hash_string (IDENTIFIER_POINTER (asmname));
646 /* Compute the number of bytes occupied by a tree with code CODE.
647 This function cannot be used for nodes that have variable sizes,
648 including TREE_VEC, STRING_CST, and CALL_EXPR. */
650 tree_code_size (enum tree_code code)
652 switch (TREE_CODE_CLASS (code))
654 case tcc_declaration: /* A decl node */
659 return sizeof (struct tree_field_decl);
661 return sizeof (struct tree_parm_decl);
663 return sizeof (struct tree_var_decl);
665 return sizeof (struct tree_label_decl);
667 return sizeof (struct tree_result_decl);
669 return sizeof (struct tree_const_decl);
671 return sizeof (struct tree_type_decl);
673 return sizeof (struct tree_function_decl);
674 case DEBUG_EXPR_DECL:
675 return sizeof (struct tree_decl_with_rtl);
677 return sizeof (struct tree_decl_non_common);
681 case tcc_type: /* a type node */
682 return sizeof (struct tree_type);
684 case tcc_reference: /* a reference */
685 case tcc_expression: /* an expression */
686 case tcc_statement: /* an expression with side effects */
687 case tcc_comparison: /* a comparison expression */
688 case tcc_unary: /* a unary arithmetic expression */
689 case tcc_binary: /* a binary arithmetic expression */
690 return (sizeof (struct tree_exp)
691 + (TREE_CODE_LENGTH (code) - 1) * sizeof (tree));
693 case tcc_constant: /* a constant */
696 case INTEGER_CST: return sizeof (struct tree_int_cst);
697 case REAL_CST: return sizeof (struct tree_real_cst);
698 case FIXED_CST: return sizeof (struct tree_fixed_cst);
699 case COMPLEX_CST: return sizeof (struct tree_complex);
700 case VECTOR_CST: return sizeof (struct tree_vector);
701 case STRING_CST: gcc_unreachable ();
703 return lang_hooks.tree_size (code);
706 case tcc_exceptional: /* something random, like an identifier. */
709 case IDENTIFIER_NODE: return lang_hooks.identifier_size;
710 case TREE_LIST: return sizeof (struct tree_list);
713 case PLACEHOLDER_EXPR: return sizeof (struct tree_common);
716 case OMP_CLAUSE: gcc_unreachable ();
718 case SSA_NAME: return sizeof (struct tree_ssa_name);
720 case STATEMENT_LIST: return sizeof (struct tree_statement_list);
721 case BLOCK: return sizeof (struct tree_block);
722 case CONSTRUCTOR: return sizeof (struct tree_constructor);
723 case OPTIMIZATION_NODE: return sizeof (struct tree_optimization_option);
724 case TARGET_OPTION_NODE: return sizeof (struct tree_target_option);
727 return lang_hooks.tree_size (code);
735 /* Compute the number of bytes occupied by NODE. This routine only
736 looks at TREE_CODE, except for those nodes that have variable sizes. */
738 tree_size (const_tree node)
740 const enum tree_code code = TREE_CODE (node);
744 return (offsetof (struct tree_binfo, base_binfos)
745 + VEC_embedded_size (tree, BINFO_N_BASE_BINFOS (node)));
748 return (sizeof (struct tree_vec)
749 + (TREE_VEC_LENGTH (node) - 1) * sizeof (tree));
752 return TREE_STRING_LENGTH (node) + offsetof (struct tree_string, str) + 1;
755 return (sizeof (struct tree_omp_clause)
756 + (omp_clause_num_ops[OMP_CLAUSE_CODE (node)] - 1)
760 if (TREE_CODE_CLASS (code) == tcc_vl_exp)
761 return (sizeof (struct tree_exp)
762 + (VL_EXP_OPERAND_LENGTH (node) - 1) * sizeof (tree));
764 return tree_code_size (code);
768 /* Return a newly allocated node of code CODE. For decl and type
769 nodes, some other fields are initialized. The rest of the node is
770 initialized to zero. This function cannot be used for TREE_VEC or
771 OMP_CLAUSE nodes, which is enforced by asserts in tree_code_size.
773 Achoo! I got a code in the node. */
776 make_node_stat (enum tree_code code MEM_STAT_DECL)
779 enum tree_code_class type = TREE_CODE_CLASS (code);
780 size_t length = tree_code_size (code);
781 #ifdef GATHER_STATISTICS
786 case tcc_declaration: /* A decl node */
790 case tcc_type: /* a type node */
794 case tcc_statement: /* an expression with side effects */
798 case tcc_reference: /* a reference */
802 case tcc_expression: /* an expression */
803 case tcc_comparison: /* a comparison expression */
804 case tcc_unary: /* a unary arithmetic expression */
805 case tcc_binary: /* a binary arithmetic expression */
809 case tcc_constant: /* a constant */
813 case tcc_exceptional: /* something random, like an identifier. */
816 case IDENTIFIER_NODE:
829 kind = ssa_name_kind;
850 tree_node_counts[(int) kind]++;
851 tree_node_sizes[(int) kind] += length;
854 t = ggc_alloc_zone_cleared_tree_node_stat (
855 (code == IDENTIFIER_NODE) ? &tree_id_zone : &tree_zone,
856 length PASS_MEM_STAT);
857 TREE_SET_CODE (t, code);
862 TREE_SIDE_EFFECTS (t) = 1;
865 case tcc_declaration:
866 if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
868 if (code == FUNCTION_DECL)
870 DECL_ALIGN (t) = FUNCTION_BOUNDARY;
871 DECL_MODE (t) = FUNCTION_MODE;
876 DECL_SOURCE_LOCATION (t) = input_location;
877 if (TREE_CODE (t) == DEBUG_EXPR_DECL)
878 DECL_UID (t) = --next_debug_decl_uid;
881 DECL_UID (t) = next_decl_uid++;
882 SET_DECL_PT_UID (t, -1);
884 if (TREE_CODE (t) == LABEL_DECL)
885 LABEL_DECL_UID (t) = -1;
890 TYPE_UID (t) = next_type_uid++;
891 TYPE_ALIGN (t) = BITS_PER_UNIT;
892 TYPE_USER_ALIGN (t) = 0;
893 TYPE_MAIN_VARIANT (t) = t;
894 TYPE_CANONICAL (t) = t;
896 /* Default to no attributes for type, but let target change that. */
897 TYPE_ATTRIBUTES (t) = NULL_TREE;
898 targetm.set_default_type_attributes (t);
900 /* We have not yet computed the alias set for this type. */
901 TYPE_ALIAS_SET (t) = -1;
905 TREE_CONSTANT (t) = 1;
914 case PREDECREMENT_EXPR:
915 case PREINCREMENT_EXPR:
916 case POSTDECREMENT_EXPR:
917 case POSTINCREMENT_EXPR:
918 /* All of these have side-effects, no matter what their
920 TREE_SIDE_EFFECTS (t) = 1;
929 /* Other classes need no special treatment. */
936 /* Return a new node with the same contents as NODE except that its
937 TREE_CHAIN is zero and it has a fresh uid. */
940 copy_node_stat (tree node MEM_STAT_DECL)
943 enum tree_code code = TREE_CODE (node);
946 gcc_assert (code != STATEMENT_LIST);
948 length = tree_size (node);
949 t = ggc_alloc_zone_tree_node_stat (&tree_zone, length PASS_MEM_STAT);
950 memcpy (t, node, length);
953 TREE_ASM_WRITTEN (t) = 0;
954 TREE_VISITED (t) = 0;
955 if (code == VAR_DECL || code == PARM_DECL || code == RESULT_DECL)
956 *DECL_VAR_ANN_PTR (t) = 0;
958 if (TREE_CODE_CLASS (code) == tcc_declaration)
960 if (code == DEBUG_EXPR_DECL)
961 DECL_UID (t) = --next_debug_decl_uid;
964 DECL_UID (t) = next_decl_uid++;
965 if (DECL_PT_UID_SET_P (node))
966 SET_DECL_PT_UID (t, DECL_PT_UID (node));
968 if ((TREE_CODE (node) == PARM_DECL || TREE_CODE (node) == VAR_DECL)
969 && DECL_HAS_VALUE_EXPR_P (node))
971 SET_DECL_VALUE_EXPR (t, DECL_VALUE_EXPR (node));
972 DECL_HAS_VALUE_EXPR_P (t) = 1;
974 if (TREE_CODE (node) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (node))
976 SET_DECL_INIT_PRIORITY (t, DECL_INIT_PRIORITY (node));
977 DECL_HAS_INIT_PRIORITY_P (t) = 1;
980 else if (TREE_CODE_CLASS (code) == tcc_type)
982 TYPE_UID (t) = next_type_uid++;
983 /* The following is so that the debug code for
984 the copy is different from the original type.
985 The two statements usually duplicate each other
986 (because they clear fields of the same union),
987 but the optimizer should catch that. */
988 TYPE_SYMTAB_POINTER (t) = 0;
989 TYPE_SYMTAB_ADDRESS (t) = 0;
991 /* Do not copy the values cache. */
992 if (TYPE_CACHED_VALUES_P(t))
994 TYPE_CACHED_VALUES_P (t) = 0;
995 TYPE_CACHED_VALUES (t) = NULL_TREE;
1002 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
1003 For example, this can copy a list made of TREE_LIST nodes. */
1006 copy_list (tree list)
1014 head = prev = copy_node (list);
1015 next = TREE_CHAIN (list);
1018 TREE_CHAIN (prev) = copy_node (next);
1019 prev = TREE_CHAIN (prev);
1020 next = TREE_CHAIN (next);
1026 /* Create an INT_CST node with a LOW value sign extended. */
1029 build_int_cst (tree type, HOST_WIDE_INT low)
1031 /* Support legacy code. */
1033 type = integer_type_node;
1035 return build_int_cst_wide (type, low, low < 0 ? -1 : 0);
1038 /* Create an INT_CST node with a LOW value in TYPE. The value is sign extended
1039 if it is negative. This function is similar to build_int_cst, but
1040 the extra bits outside of the type precision are cleared. Constants
1041 with these extra bits may confuse the fold so that it detects overflows
1042 even in cases when they do not occur, and in general should be avoided.
1043 We cannot however make this a default behavior of build_int_cst without
1044 more intrusive changes, since there are parts of gcc that rely on the extra
1045 precision of the integer constants. */
1048 build_int_cst_type (tree type, HOST_WIDE_INT low)
1052 return double_int_to_tree (type, shwi_to_double_int (low));
1055 /* Constructs tree in type TYPE from with value given by CST. Signedness
1056 of CST is assumed to be the same as the signedness of TYPE. */
1059 double_int_to_tree (tree type, double_int cst)
1061 /* Size types *are* sign extended. */
1062 bool sign_extended_type = (!TYPE_UNSIGNED (type)
1063 || (TREE_CODE (type) == INTEGER_TYPE
1064 && TYPE_IS_SIZETYPE (type)));
1066 cst = double_int_ext (cst, TYPE_PRECISION (type), !sign_extended_type);
1068 return build_int_cst_wide (type, cst.low, cst.high);
1071 /* Returns true if CST fits into range of TYPE. Signedness of CST is assumed
1072 to be the same as the signedness of TYPE. */
1075 double_int_fits_to_tree_p (const_tree type, double_int cst)
1077 /* Size types *are* sign extended. */
1078 bool sign_extended_type = (!TYPE_UNSIGNED (type)
1079 || (TREE_CODE (type) == INTEGER_TYPE
1080 && TYPE_IS_SIZETYPE (type)));
1083 = double_int_ext (cst, TYPE_PRECISION (type), !sign_extended_type);
1085 return double_int_equal_p (cst, ext);
1088 /* We force the double_int CST to the range of the type TYPE by sign or
1089 zero extending it. OVERFLOWABLE indicates if we are interested in
1090 overflow of the value, when >0 we are only interested in signed
1091 overflow, for <0 we are interested in any overflow. OVERFLOWED
1092 indicates whether overflow has already occurred. CONST_OVERFLOWED
1093 indicates whether constant overflow has already occurred. We force
1094 T's value to be within range of T's type (by setting to 0 or 1 all
1095 the bits outside the type's range). We set TREE_OVERFLOWED if,
1096 OVERFLOWED is nonzero,
1097 or OVERFLOWABLE is >0 and signed overflow occurs
1098 or OVERFLOWABLE is <0 and any overflow occurs
1099 We return a new tree node for the extended double_int. The node
1100 is shared if no overflow flags are set. */
1104 force_fit_type_double (tree type, double_int cst, int overflowable,
1107 bool sign_extended_type;
1109 /* Size types *are* sign extended. */
1110 sign_extended_type = (!TYPE_UNSIGNED (type)
1111 || (TREE_CODE (type) == INTEGER_TYPE
1112 && TYPE_IS_SIZETYPE (type)));
1114 /* If we need to set overflow flags, return a new unshared node. */
1115 if (overflowed || !double_int_fits_to_tree_p(type, cst))
1119 || (overflowable > 0 && sign_extended_type))
1121 tree t = make_node (INTEGER_CST);
1122 TREE_INT_CST (t) = double_int_ext (cst, TYPE_PRECISION (type),
1123 !sign_extended_type);
1124 TREE_TYPE (t) = type;
1125 TREE_OVERFLOW (t) = 1;
1130 /* Else build a shared node. */
1131 return double_int_to_tree (type, cst);
1134 /* These are the hash table functions for the hash table of INTEGER_CST
1135 nodes of a sizetype. */
1137 /* Return the hash code code X, an INTEGER_CST. */
1140 int_cst_hash_hash (const void *x)
1142 const_tree const t = (const_tree) x;
1144 return (TREE_INT_CST_HIGH (t) ^ TREE_INT_CST_LOW (t)
1145 ^ htab_hash_pointer (TREE_TYPE (t)));
1148 /* Return nonzero if the value represented by *X (an INTEGER_CST tree node)
1149 is the same as that given by *Y, which is the same. */
1152 int_cst_hash_eq (const void *x, const void *y)
1154 const_tree const xt = (const_tree) x;
1155 const_tree const yt = (const_tree) y;
1157 return (TREE_TYPE (xt) == TREE_TYPE (yt)
1158 && TREE_INT_CST_HIGH (xt) == TREE_INT_CST_HIGH (yt)
1159 && TREE_INT_CST_LOW (xt) == TREE_INT_CST_LOW (yt));
1162 /* Create an INT_CST node of TYPE and value HI:LOW.
1163 The returned node is always shared. For small integers we use a
1164 per-type vector cache, for larger ones we use a single hash table. */
1167 build_int_cst_wide (tree type, unsigned HOST_WIDE_INT low, HOST_WIDE_INT hi)
1175 switch (TREE_CODE (type))
1178 case REFERENCE_TYPE:
1179 /* Cache NULL pointer. */
1188 /* Cache false or true. */
1196 if (TYPE_UNSIGNED (type))
1199 limit = INTEGER_SHARE_LIMIT;
1200 if (!hi && low < (unsigned HOST_WIDE_INT)INTEGER_SHARE_LIMIT)
1206 limit = INTEGER_SHARE_LIMIT + 1;
1207 if (!hi && low < (unsigned HOST_WIDE_INT)INTEGER_SHARE_LIMIT)
1209 else if (hi == -1 && low == -(unsigned HOST_WIDE_INT)1)
1223 /* Look for it in the type's vector of small shared ints. */
1224 if (!TYPE_CACHED_VALUES_P (type))
1226 TYPE_CACHED_VALUES_P (type) = 1;
1227 TYPE_CACHED_VALUES (type) = make_tree_vec (limit);
1230 t = TREE_VEC_ELT (TYPE_CACHED_VALUES (type), ix);
1233 /* Make sure no one is clobbering the shared constant. */
1234 gcc_assert (TREE_TYPE (t) == type);
1235 gcc_assert (TREE_INT_CST_LOW (t) == low);
1236 gcc_assert (TREE_INT_CST_HIGH (t) == hi);
1240 /* Create a new shared int. */
1241 t = make_node (INTEGER_CST);
1243 TREE_INT_CST_LOW (t) = low;
1244 TREE_INT_CST_HIGH (t) = hi;
1245 TREE_TYPE (t) = type;
1247 TREE_VEC_ELT (TYPE_CACHED_VALUES (type), ix) = t;
1252 /* Use the cache of larger shared ints. */
1255 TREE_INT_CST_LOW (int_cst_node) = low;
1256 TREE_INT_CST_HIGH (int_cst_node) = hi;
1257 TREE_TYPE (int_cst_node) = type;
1259 slot = htab_find_slot (int_cst_hash_table, int_cst_node, INSERT);
1263 /* Insert this one into the hash table. */
1266 /* Make a new node for next time round. */
1267 int_cst_node = make_node (INTEGER_CST);
1274 /* Builds an integer constant in TYPE such that lowest BITS bits are ones
1275 and the rest are zeros. */
1278 build_low_bits_mask (tree type, unsigned bits)
1282 gcc_assert (bits <= TYPE_PRECISION (type));
1284 if (bits == TYPE_PRECISION (type)
1285 && !TYPE_UNSIGNED (type))
1286 /* Sign extended all-ones mask. */
1287 mask = double_int_minus_one;
1289 mask = double_int_mask (bits);
1291 return build_int_cst_wide (type, mask.low, mask.high);
1294 /* Checks that X is integer constant that can be expressed in (unsigned)
1295 HOST_WIDE_INT without loss of precision. */
1298 cst_and_fits_in_hwi (const_tree x)
1300 if (TREE_CODE (x) != INTEGER_CST)
1303 if (TYPE_PRECISION (TREE_TYPE (x)) > HOST_BITS_PER_WIDE_INT)
1306 return (TREE_INT_CST_HIGH (x) == 0
1307 || TREE_INT_CST_HIGH (x) == -1);
1310 /* Return a new VECTOR_CST node whose type is TYPE and whose values
1311 are in a list pointed to by VALS. */
1314 build_vector (tree type, tree vals)
1316 tree v = make_node (VECTOR_CST);
1321 TREE_VECTOR_CST_ELTS (v) = vals;
1322 TREE_TYPE (v) = type;
1324 /* Iterate through elements and check for overflow. */
1325 for (link = vals; link; link = TREE_CHAIN (link))
1327 tree value = TREE_VALUE (link);
1330 /* Don't crash if we get an address constant. */
1331 if (!CONSTANT_CLASS_P (value))
1334 over |= TREE_OVERFLOW (value);
1337 gcc_assert (cnt == TYPE_VECTOR_SUBPARTS (type));
1339 TREE_OVERFLOW (v) = over;
1343 /* Return a new VECTOR_CST node whose type is TYPE and whose values
1344 are extracted from V, a vector of CONSTRUCTOR_ELT. */
1347 build_vector_from_ctor (tree type, VEC(constructor_elt,gc) *v)
1349 tree list = NULL_TREE;
1350 unsigned HOST_WIDE_INT idx;
1353 FOR_EACH_CONSTRUCTOR_VALUE (v, idx, value)
1354 list = tree_cons (NULL_TREE, value, list);
1355 for (; idx < TYPE_VECTOR_SUBPARTS (type); ++idx)
1356 list = tree_cons (NULL_TREE,
1357 fold_convert (TREE_TYPE (type), integer_zero_node), list);
1358 return build_vector (type, nreverse (list));
1361 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
1362 are in the VEC pointed to by VALS. */
1364 build_constructor (tree type, VEC(constructor_elt,gc) *vals)
1366 tree c = make_node (CONSTRUCTOR);
1368 constructor_elt *elt;
1369 bool constant_p = true;
1371 TREE_TYPE (c) = type;
1372 CONSTRUCTOR_ELTS (c) = vals;
1374 FOR_EACH_VEC_ELT (constructor_elt, vals, i, elt)
1375 if (!TREE_CONSTANT (elt->value))
1381 TREE_CONSTANT (c) = constant_p;
1386 /* Build a CONSTRUCTOR node made of a single initializer, with the specified
1389 build_constructor_single (tree type, tree index, tree value)
1391 VEC(constructor_elt,gc) *v;
1392 constructor_elt *elt;
1394 v = VEC_alloc (constructor_elt, gc, 1);
1395 elt = VEC_quick_push (constructor_elt, v, NULL);
1399 return build_constructor (type, v);
1403 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
1404 are in a list pointed to by VALS. */
1406 build_constructor_from_list (tree type, tree vals)
1409 VEC(constructor_elt,gc) *v = NULL;
1413 v = VEC_alloc (constructor_elt, gc, list_length (vals));
1414 for (t = vals; t; t = TREE_CHAIN (t))
1415 CONSTRUCTOR_APPEND_ELT (v, TREE_PURPOSE (t), TREE_VALUE (t));
1418 return build_constructor (type, v);
1421 /* Return a new FIXED_CST node whose type is TYPE and value is F. */
1424 build_fixed (tree type, FIXED_VALUE_TYPE f)
1427 FIXED_VALUE_TYPE *fp;
1429 v = make_node (FIXED_CST);
1430 fp = ggc_alloc_fixed_value ();
1431 memcpy (fp, &f, sizeof (FIXED_VALUE_TYPE));
1433 TREE_TYPE (v) = type;
1434 TREE_FIXED_CST_PTR (v) = fp;
1438 /* Return a new REAL_CST node whose type is TYPE and value is D. */
1441 build_real (tree type, REAL_VALUE_TYPE d)
1444 REAL_VALUE_TYPE *dp;
1447 /* ??? Used to check for overflow here via CHECK_FLOAT_TYPE.
1448 Consider doing it via real_convert now. */
1450 v = make_node (REAL_CST);
1451 dp = ggc_alloc_real_value ();
1452 memcpy (dp, &d, sizeof (REAL_VALUE_TYPE));
1454 TREE_TYPE (v) = type;
1455 TREE_REAL_CST_PTR (v) = dp;
1456 TREE_OVERFLOW (v) = overflow;
1460 /* Return a new REAL_CST node whose type is TYPE
1461 and whose value is the integer value of the INTEGER_CST node I. */
1464 real_value_from_int_cst (const_tree type, const_tree i)
1468 /* Clear all bits of the real value type so that we can later do
1469 bitwise comparisons to see if two values are the same. */
1470 memset (&d, 0, sizeof d);
1472 real_from_integer (&d, type ? TYPE_MODE (type) : VOIDmode,
1473 TREE_INT_CST_LOW (i), TREE_INT_CST_HIGH (i),
1474 TYPE_UNSIGNED (TREE_TYPE (i)));
1478 /* Given a tree representing an integer constant I, return a tree
1479 representing the same value as a floating-point constant of type TYPE. */
1482 build_real_from_int_cst (tree type, const_tree i)
1485 int overflow = TREE_OVERFLOW (i);
1487 v = build_real (type, real_value_from_int_cst (type, i));
1489 TREE_OVERFLOW (v) |= overflow;
1493 /* Return a newly constructed STRING_CST node whose value is
1494 the LEN characters at STR.
1495 The TREE_TYPE is not initialized. */
1498 build_string (int len, const char *str)
1503 /* Do not waste bytes provided by padding of struct tree_string. */
1504 length = len + offsetof (struct tree_string, str) + 1;
1506 #ifdef GATHER_STATISTICS
1507 tree_node_counts[(int) c_kind]++;
1508 tree_node_sizes[(int) c_kind] += length;
1511 s = ggc_alloc_tree_node (length);
1513 memset (s, 0, sizeof (struct tree_common));
1514 TREE_SET_CODE (s, STRING_CST);
1515 TREE_CONSTANT (s) = 1;
1516 TREE_STRING_LENGTH (s) = len;
1517 memcpy (s->string.str, str, len);
1518 s->string.str[len] = '\0';
1523 /* Return a newly constructed COMPLEX_CST node whose value is
1524 specified by the real and imaginary parts REAL and IMAG.
1525 Both REAL and IMAG should be constant nodes. TYPE, if specified,
1526 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
1529 build_complex (tree type, tree real, tree imag)
1531 tree t = make_node (COMPLEX_CST);
1533 TREE_REALPART (t) = real;
1534 TREE_IMAGPART (t) = imag;
1535 TREE_TYPE (t) = type ? type : build_complex_type (TREE_TYPE (real));
1536 TREE_OVERFLOW (t) = TREE_OVERFLOW (real) | TREE_OVERFLOW (imag);
1540 /* Return a constant of arithmetic type TYPE which is the
1541 multiplicative identity of the set TYPE. */
1544 build_one_cst (tree type)
1546 switch (TREE_CODE (type))
1548 case INTEGER_TYPE: case ENUMERAL_TYPE: case BOOLEAN_TYPE:
1549 case POINTER_TYPE: case REFERENCE_TYPE:
1551 return build_int_cst (type, 1);
1554 return build_real (type, dconst1);
1556 case FIXED_POINT_TYPE:
1557 /* We can only generate 1 for accum types. */
1558 gcc_assert (ALL_SCALAR_ACCUM_MODE_P (TYPE_MODE (type)));
1559 return build_fixed (type, FCONST1(TYPE_MODE (type)));
1566 scalar = build_one_cst (TREE_TYPE (type));
1568 /* Create 'vect_cst_ = {cst,cst,...,cst}' */
1570 for (i = TYPE_VECTOR_SUBPARTS (type); --i >= 0; )
1571 cst = tree_cons (NULL_TREE, scalar, cst);
1573 return build_vector (type, cst);
1577 return build_complex (type,
1578 build_one_cst (TREE_TYPE (type)),
1579 fold_convert (TREE_TYPE (type), integer_zero_node));
1586 /* Build a BINFO with LEN language slots. */
1589 make_tree_binfo_stat (unsigned base_binfos MEM_STAT_DECL)
1592 size_t length = (offsetof (struct tree_binfo, base_binfos)
1593 + VEC_embedded_size (tree, base_binfos));
1595 #ifdef GATHER_STATISTICS
1596 tree_node_counts[(int) binfo_kind]++;
1597 tree_node_sizes[(int) binfo_kind] += length;
1600 t = ggc_alloc_zone_tree_node_stat (&tree_zone, length PASS_MEM_STAT);
1602 memset (t, 0, offsetof (struct tree_binfo, base_binfos));
1604 TREE_SET_CODE (t, TREE_BINFO);
1606 VEC_embedded_init (tree, BINFO_BASE_BINFOS (t), base_binfos);
1612 /* Build a newly constructed TREE_VEC node of length LEN. */
1615 make_tree_vec_stat (int len MEM_STAT_DECL)
1618 int length = (len - 1) * sizeof (tree) + sizeof (struct tree_vec);
1620 #ifdef GATHER_STATISTICS
1621 tree_node_counts[(int) vec_kind]++;
1622 tree_node_sizes[(int) vec_kind] += length;
1625 t = ggc_alloc_zone_cleared_tree_node_stat (&tree_zone, length PASS_MEM_STAT);
1627 TREE_SET_CODE (t, TREE_VEC);
1628 TREE_VEC_LENGTH (t) = len;
1633 /* Return 1 if EXPR is the integer constant zero or a complex constant
1637 integer_zerop (const_tree expr)
1641 return ((TREE_CODE (expr) == INTEGER_CST
1642 && TREE_INT_CST_LOW (expr) == 0
1643 && TREE_INT_CST_HIGH (expr) == 0)
1644 || (TREE_CODE (expr) == COMPLEX_CST
1645 && integer_zerop (TREE_REALPART (expr))
1646 && integer_zerop (TREE_IMAGPART (expr))));
1649 /* Return 1 if EXPR is the integer constant one or the corresponding
1650 complex constant. */
1653 integer_onep (const_tree expr)
1657 return ((TREE_CODE (expr) == INTEGER_CST
1658 && TREE_INT_CST_LOW (expr) == 1
1659 && TREE_INT_CST_HIGH (expr) == 0)
1660 || (TREE_CODE (expr) == COMPLEX_CST
1661 && integer_onep (TREE_REALPART (expr))
1662 && integer_zerop (TREE_IMAGPART (expr))));
1665 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
1666 it contains. Likewise for the corresponding complex constant. */
1669 integer_all_onesp (const_tree expr)
1676 if (TREE_CODE (expr) == COMPLEX_CST
1677 && integer_all_onesp (TREE_REALPART (expr))
1678 && integer_zerop (TREE_IMAGPART (expr)))
1681 else if (TREE_CODE (expr) != INTEGER_CST)
1684 uns = TYPE_UNSIGNED (TREE_TYPE (expr));
1685 if (TREE_INT_CST_LOW (expr) == ~(unsigned HOST_WIDE_INT) 0
1686 && TREE_INT_CST_HIGH (expr) == -1)
1691 /* Note that using TYPE_PRECISION here is wrong. We care about the
1692 actual bits, not the (arbitrary) range of the type. */
1693 prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr)));
1694 if (prec >= HOST_BITS_PER_WIDE_INT)
1696 HOST_WIDE_INT high_value;
1699 shift_amount = prec - HOST_BITS_PER_WIDE_INT;
1701 /* Can not handle precisions greater than twice the host int size. */
1702 gcc_assert (shift_amount <= HOST_BITS_PER_WIDE_INT);
1703 if (shift_amount == HOST_BITS_PER_WIDE_INT)
1704 /* Shifting by the host word size is undefined according to the ANSI
1705 standard, so we must handle this as a special case. */
1708 high_value = ((HOST_WIDE_INT) 1 << shift_amount) - 1;
1710 return (TREE_INT_CST_LOW (expr) == ~(unsigned HOST_WIDE_INT) 0
1711 && TREE_INT_CST_HIGH (expr) == high_value);
1714 return TREE_INT_CST_LOW (expr) == ((unsigned HOST_WIDE_INT) 1 << prec) - 1;
1717 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
1721 integer_pow2p (const_tree expr)
1724 HOST_WIDE_INT high, low;
1728 if (TREE_CODE (expr) == COMPLEX_CST
1729 && integer_pow2p (TREE_REALPART (expr))
1730 && integer_zerop (TREE_IMAGPART (expr)))
1733 if (TREE_CODE (expr) != INTEGER_CST)
1736 prec = TYPE_PRECISION (TREE_TYPE (expr));
1737 high = TREE_INT_CST_HIGH (expr);
1738 low = TREE_INT_CST_LOW (expr);
1740 /* First clear all bits that are beyond the type's precision in case
1741 we've been sign extended. */
1743 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
1745 else if (prec > HOST_BITS_PER_WIDE_INT)
1746 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
1750 if (prec < HOST_BITS_PER_WIDE_INT)
1751 low &= ~((HOST_WIDE_INT) (-1) << prec);
1754 if (high == 0 && low == 0)
1757 return ((high == 0 && (low & (low - 1)) == 0)
1758 || (low == 0 && (high & (high - 1)) == 0));
1761 /* Return 1 if EXPR is an integer constant other than zero or a
1762 complex constant other than zero. */
1765 integer_nonzerop (const_tree expr)
1769 return ((TREE_CODE (expr) == INTEGER_CST
1770 && (TREE_INT_CST_LOW (expr) != 0
1771 || TREE_INT_CST_HIGH (expr) != 0))
1772 || (TREE_CODE (expr) == COMPLEX_CST
1773 && (integer_nonzerop (TREE_REALPART (expr))
1774 || integer_nonzerop (TREE_IMAGPART (expr)))));
1777 /* Return 1 if EXPR is the fixed-point constant zero. */
1780 fixed_zerop (const_tree expr)
1782 return (TREE_CODE (expr) == FIXED_CST
1783 && double_int_zero_p (TREE_FIXED_CST (expr).data));
1786 /* Return the power of two represented by a tree node known to be a
1790 tree_log2 (const_tree expr)
1793 HOST_WIDE_INT high, low;
1797 if (TREE_CODE (expr) == COMPLEX_CST)
1798 return tree_log2 (TREE_REALPART (expr));
1800 prec = TYPE_PRECISION (TREE_TYPE (expr));
1801 high = TREE_INT_CST_HIGH (expr);
1802 low = TREE_INT_CST_LOW (expr);
1804 /* First clear all bits that are beyond the type's precision in case
1805 we've been sign extended. */
1807 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
1809 else if (prec > HOST_BITS_PER_WIDE_INT)
1810 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
1814 if (prec < HOST_BITS_PER_WIDE_INT)
1815 low &= ~((HOST_WIDE_INT) (-1) << prec);
1818 return (high != 0 ? HOST_BITS_PER_WIDE_INT + exact_log2 (high)
1819 : exact_log2 (low));
1822 /* Similar, but return the largest integer Y such that 2 ** Y is less
1823 than or equal to EXPR. */
1826 tree_floor_log2 (const_tree expr)
1829 HOST_WIDE_INT high, low;
1833 if (TREE_CODE (expr) == COMPLEX_CST)
1834 return tree_log2 (TREE_REALPART (expr));
1836 prec = TYPE_PRECISION (TREE_TYPE (expr));
1837 high = TREE_INT_CST_HIGH (expr);
1838 low = TREE_INT_CST_LOW (expr);
1840 /* First clear all bits that are beyond the type's precision in case
1841 we've been sign extended. Ignore if type's precision hasn't been set
1842 since what we are doing is setting it. */
1844 if (prec == 2 * HOST_BITS_PER_WIDE_INT || prec == 0)
1846 else if (prec > HOST_BITS_PER_WIDE_INT)
1847 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
1851 if (prec < HOST_BITS_PER_WIDE_INT)
1852 low &= ~((HOST_WIDE_INT) (-1) << prec);
1855 return (high != 0 ? HOST_BITS_PER_WIDE_INT + floor_log2 (high)
1856 : floor_log2 (low));
1859 /* Return 1 if EXPR is the real constant zero. Trailing zeroes matter for
1860 decimal float constants, so don't return 1 for them. */
1863 real_zerop (const_tree expr)
1867 return ((TREE_CODE (expr) == REAL_CST
1868 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst0)
1869 && !(DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (expr)))))
1870 || (TREE_CODE (expr) == COMPLEX_CST
1871 && real_zerop (TREE_REALPART (expr))
1872 && real_zerop (TREE_IMAGPART (expr))));
1875 /* Return 1 if EXPR is the real constant one in real or complex form.
1876 Trailing zeroes matter for decimal float constants, so don't return
1880 real_onep (const_tree expr)
1884 return ((TREE_CODE (expr) == REAL_CST
1885 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst1)
1886 && !(DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (expr)))))
1887 || (TREE_CODE (expr) == COMPLEX_CST
1888 && real_onep (TREE_REALPART (expr))
1889 && real_zerop (TREE_IMAGPART (expr))));
1892 /* Return 1 if EXPR is the real constant two. Trailing zeroes matter
1893 for decimal float constants, so don't return 1 for them. */
1896 real_twop (const_tree expr)
1900 return ((TREE_CODE (expr) == REAL_CST
1901 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst2)
1902 && !(DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (expr)))))
1903 || (TREE_CODE (expr) == COMPLEX_CST
1904 && real_twop (TREE_REALPART (expr))
1905 && real_zerop (TREE_IMAGPART (expr))));
1908 /* Return 1 if EXPR is the real constant minus one. Trailing zeroes
1909 matter for decimal float constants, so don't return 1 for them. */
1912 real_minus_onep (const_tree expr)
1916 return ((TREE_CODE (expr) == REAL_CST
1917 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconstm1)
1918 && !(DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (expr)))))
1919 || (TREE_CODE (expr) == COMPLEX_CST
1920 && real_minus_onep (TREE_REALPART (expr))
1921 && real_zerop (TREE_IMAGPART (expr))));
1924 /* Nonzero if EXP is a constant or a cast of a constant. */
1927 really_constant_p (const_tree exp)
1929 /* This is not quite the same as STRIP_NOPS. It does more. */
1930 while (CONVERT_EXPR_P (exp)
1931 || TREE_CODE (exp) == NON_LVALUE_EXPR)
1932 exp = TREE_OPERAND (exp, 0);
1933 return TREE_CONSTANT (exp);
1936 /* Return first list element whose TREE_VALUE is ELEM.
1937 Return 0 if ELEM is not in LIST. */
1940 value_member (tree elem, tree list)
1944 if (elem == TREE_VALUE (list))
1946 list = TREE_CHAIN (list);
1951 /* Return first list element whose TREE_PURPOSE is ELEM.
1952 Return 0 if ELEM is not in LIST. */
1955 purpose_member (const_tree elem, tree list)
1959 if (elem == TREE_PURPOSE (list))
1961 list = TREE_CHAIN (list);
1966 /* Return true if ELEM is in V. */
1969 vec_member (const_tree elem, VEC(tree,gc) *v)
1973 FOR_EACH_VEC_ELT (tree, v, ix, t)
1979 /* Returns element number IDX (zero-origin) of chain CHAIN, or
1983 chain_index (int idx, tree chain)
1985 for (; chain && idx > 0; --idx)
1986 chain = TREE_CHAIN (chain);
1990 /* Return nonzero if ELEM is part of the chain CHAIN. */
1993 chain_member (const_tree elem, const_tree chain)
1999 chain = DECL_CHAIN (chain);
2005 /* Return the length of a chain of nodes chained through TREE_CHAIN.
2006 We expect a null pointer to mark the end of the chain.
2007 This is the Lisp primitive `length'. */
2010 list_length (const_tree t)
2013 #ifdef ENABLE_TREE_CHECKING
2021 #ifdef ENABLE_TREE_CHECKING
2024 gcc_assert (p != q);
2032 /* Returns the number of FIELD_DECLs in TYPE. */
2035 fields_length (const_tree type)
2037 tree t = TYPE_FIELDS (type);
2040 for (; t; t = DECL_CHAIN (t))
2041 if (TREE_CODE (t) == FIELD_DECL)
2047 /* Returns the first FIELD_DECL in the TYPE_FIELDS of the RECORD_TYPE or
2048 UNION_TYPE TYPE, or NULL_TREE if none. */
2051 first_field (const_tree type)
2053 tree t = TYPE_FIELDS (type);
2054 while (t && TREE_CODE (t) != FIELD_DECL)
2059 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
2060 by modifying the last node in chain 1 to point to chain 2.
2061 This is the Lisp primitive `nconc'. */
2064 chainon (tree op1, tree op2)
2073 for (t1 = op1; TREE_CHAIN (t1); t1 = TREE_CHAIN (t1))
2075 TREE_CHAIN (t1) = op2;
2077 #ifdef ENABLE_TREE_CHECKING
2080 for (t2 = op2; t2; t2 = TREE_CHAIN (t2))
2081 gcc_assert (t2 != t1);
2088 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
2091 tree_last (tree chain)
2095 while ((next = TREE_CHAIN (chain)))
2100 /* Reverse the order of elements in the chain T,
2101 and return the new head of the chain (old last element). */
2106 tree prev = 0, decl, next;
2107 for (decl = t; decl; decl = next)
2109 /* We shouldn't be using this function to reverse BLOCK chains; we
2110 have blocks_nreverse for that. */
2111 gcc_checking_assert (TREE_CODE (decl) != BLOCK);
2112 next = TREE_CHAIN (decl);
2113 TREE_CHAIN (decl) = prev;
2119 /* Return a newly created TREE_LIST node whose
2120 purpose and value fields are PARM and VALUE. */
2123 build_tree_list_stat (tree parm, tree value MEM_STAT_DECL)
2125 tree t = make_node_stat (TREE_LIST PASS_MEM_STAT);
2126 TREE_PURPOSE (t) = parm;
2127 TREE_VALUE (t) = value;
2131 /* Build a chain of TREE_LIST nodes from a vector. */
2134 build_tree_list_vec_stat (const VEC(tree,gc) *vec MEM_STAT_DECL)
2136 tree ret = NULL_TREE;
2140 FOR_EACH_VEC_ELT (tree, vec, i, t)
2142 *pp = build_tree_list_stat (NULL, t PASS_MEM_STAT);
2143 pp = &TREE_CHAIN (*pp);
2148 /* Return a newly created TREE_LIST node whose
2149 purpose and value fields are PURPOSE and VALUE
2150 and whose TREE_CHAIN is CHAIN. */
2153 tree_cons_stat (tree purpose, tree value, tree chain MEM_STAT_DECL)
2157 node = ggc_alloc_zone_tree_node_stat (&tree_zone, sizeof (struct tree_list)
2159 memset (node, 0, sizeof (struct tree_common));
2161 #ifdef GATHER_STATISTICS
2162 tree_node_counts[(int) x_kind]++;
2163 tree_node_sizes[(int) x_kind] += sizeof (struct tree_list);
2166 TREE_SET_CODE (node, TREE_LIST);
2167 TREE_CHAIN (node) = chain;
2168 TREE_PURPOSE (node) = purpose;
2169 TREE_VALUE (node) = value;
2173 /* Return the values of the elements of a CONSTRUCTOR as a vector of
2177 ctor_to_vec (tree ctor)
2179 VEC(tree, gc) *vec = VEC_alloc (tree, gc, CONSTRUCTOR_NELTS (ctor));
2183 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (ctor), ix, val)
2184 VEC_quick_push (tree, vec, val);
2189 /* Return the size nominally occupied by an object of type TYPE
2190 when it resides in memory. The value is measured in units of bytes,
2191 and its data type is that normally used for type sizes
2192 (which is the first type created by make_signed_type or
2193 make_unsigned_type). */
2196 size_in_bytes (const_tree type)
2200 if (type == error_mark_node)
2201 return integer_zero_node;
2203 type = TYPE_MAIN_VARIANT (type);
2204 t = TYPE_SIZE_UNIT (type);
2208 lang_hooks.types.incomplete_type_error (NULL_TREE, type);
2209 return size_zero_node;
2215 /* Return the size of TYPE (in bytes) as a wide integer
2216 or return -1 if the size can vary or is larger than an integer. */
2219 int_size_in_bytes (const_tree type)
2223 if (type == error_mark_node)
2226 type = TYPE_MAIN_VARIANT (type);
2227 t = TYPE_SIZE_UNIT (type);
2229 || TREE_CODE (t) != INTEGER_CST
2230 || TREE_INT_CST_HIGH (t) != 0
2231 /* If the result would appear negative, it's too big to represent. */
2232 || (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0)
2235 return TREE_INT_CST_LOW (t);
2238 /* Return the maximum size of TYPE (in bytes) as a wide integer
2239 or return -1 if the size can vary or is larger than an integer. */
2242 max_int_size_in_bytes (const_tree type)
2244 HOST_WIDE_INT size = -1;
2247 /* If this is an array type, check for a possible MAX_SIZE attached. */
2249 if (TREE_CODE (type) == ARRAY_TYPE)
2251 size_tree = TYPE_ARRAY_MAX_SIZE (type);
2253 if (size_tree && host_integerp (size_tree, 1))
2254 size = tree_low_cst (size_tree, 1);
2257 /* If we still haven't been able to get a size, see if the language
2258 can compute a maximum size. */
2262 size_tree = lang_hooks.types.max_size (type);
2264 if (size_tree && host_integerp (size_tree, 1))
2265 size = tree_low_cst (size_tree, 1);
2271 /* Returns a tree for the size of EXP in bytes. */
2274 tree_expr_size (const_tree exp)
2277 && DECL_SIZE_UNIT (exp) != 0)
2278 return DECL_SIZE_UNIT (exp);
2280 return size_in_bytes (TREE_TYPE (exp));
2283 /* Return the bit position of FIELD, in bits from the start of the record.
2284 This is a tree of type bitsizetype. */
2287 bit_position (const_tree field)
2289 return bit_from_pos (DECL_FIELD_OFFSET (field),
2290 DECL_FIELD_BIT_OFFSET (field));
2293 /* Likewise, but return as an integer. It must be representable in
2294 that way (since it could be a signed value, we don't have the
2295 option of returning -1 like int_size_in_byte can. */
2298 int_bit_position (const_tree field)
2300 return tree_low_cst (bit_position (field), 0);
2303 /* Return the byte position of FIELD, in bytes from the start of the record.
2304 This is a tree of type sizetype. */
2307 byte_position (const_tree field)
2309 return byte_from_pos (DECL_FIELD_OFFSET (field),
2310 DECL_FIELD_BIT_OFFSET (field));
2313 /* Likewise, but return as an integer. It must be representable in
2314 that way (since it could be a signed value, we don't have the
2315 option of returning -1 like int_size_in_byte can. */
2318 int_byte_position (const_tree field)
2320 return tree_low_cst (byte_position (field), 0);
2323 /* Return the strictest alignment, in bits, that T is known to have. */
2326 expr_align (const_tree t)
2328 unsigned int align0, align1;
2330 switch (TREE_CODE (t))
2332 CASE_CONVERT: case NON_LVALUE_EXPR:
2333 /* If we have conversions, we know that the alignment of the
2334 object must meet each of the alignments of the types. */
2335 align0 = expr_align (TREE_OPERAND (t, 0));
2336 align1 = TYPE_ALIGN (TREE_TYPE (t));
2337 return MAX (align0, align1);
2339 case SAVE_EXPR: case COMPOUND_EXPR: case MODIFY_EXPR:
2340 case INIT_EXPR: case TARGET_EXPR: case WITH_CLEANUP_EXPR:
2341 case CLEANUP_POINT_EXPR:
2342 /* These don't change the alignment of an object. */
2343 return expr_align (TREE_OPERAND (t, 0));
2346 /* The best we can do is say that the alignment is the least aligned
2348 align0 = expr_align (TREE_OPERAND (t, 1));
2349 align1 = expr_align (TREE_OPERAND (t, 2));
2350 return MIN (align0, align1);
2352 /* FIXME: LABEL_DECL and CONST_DECL never have DECL_ALIGN set
2353 meaningfully, it's always 1. */
2354 case LABEL_DECL: case CONST_DECL:
2355 case VAR_DECL: case PARM_DECL: case RESULT_DECL:
2357 gcc_assert (DECL_ALIGN (t) != 0);
2358 return DECL_ALIGN (t);
2364 /* Otherwise take the alignment from that of the type. */
2365 return TYPE_ALIGN (TREE_TYPE (t));
2368 /* Return, as a tree node, the number of elements for TYPE (which is an
2369 ARRAY_TYPE) minus one. This counts only elements of the top array. */
2372 array_type_nelts (const_tree type)
2374 tree index_type, min, max;
2376 /* If they did it with unspecified bounds, then we should have already
2377 given an error about it before we got here. */
2378 if (! TYPE_DOMAIN (type))
2379 return error_mark_node;
2381 index_type = TYPE_DOMAIN (type);
2382 min = TYPE_MIN_VALUE (index_type);
2383 max = TYPE_MAX_VALUE (index_type);
2385 return (integer_zerop (min)
2387 : fold_build2 (MINUS_EXPR, TREE_TYPE (max), max, min));
2390 /* If arg is static -- a reference to an object in static storage -- then
2391 return the object. This is not the same as the C meaning of `static'.
2392 If arg isn't static, return NULL. */
2397 switch (TREE_CODE (arg))
2400 /* Nested functions are static, even though taking their address will
2401 involve a trampoline as we unnest the nested function and create
2402 the trampoline on the tree level. */
2406 return ((TREE_STATIC (arg) || DECL_EXTERNAL (arg))
2407 && ! DECL_THREAD_LOCAL_P (arg)
2408 && ! DECL_DLLIMPORT_P (arg)
2412 return ((TREE_STATIC (arg) || DECL_EXTERNAL (arg))
2416 return TREE_STATIC (arg) ? arg : NULL;
2423 /* If the thing being referenced is not a field, then it is
2424 something language specific. */
2425 gcc_assert (TREE_CODE (TREE_OPERAND (arg, 1)) == FIELD_DECL);
2427 /* If we are referencing a bitfield, we can't evaluate an
2428 ADDR_EXPR at compile time and so it isn't a constant. */
2429 if (DECL_BIT_FIELD (TREE_OPERAND (arg, 1)))
2432 return staticp (TREE_OPERAND (arg, 0));
2438 return TREE_CONSTANT (TREE_OPERAND (arg, 0)) ? arg : NULL;
2441 case ARRAY_RANGE_REF:
2442 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg))) == INTEGER_CST
2443 && TREE_CODE (TREE_OPERAND (arg, 1)) == INTEGER_CST)
2444 return staticp (TREE_OPERAND (arg, 0));
2448 case COMPOUND_LITERAL_EXPR:
2449 return TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (arg)) ? arg : NULL;
2459 /* Return whether OP is a DECL whose address is function-invariant. */
2462 decl_address_invariant_p (const_tree op)
2464 /* The conditions below are slightly less strict than the one in
2467 switch (TREE_CODE (op))
2476 if ((TREE_STATIC (op) || DECL_EXTERNAL (op))
2477 || DECL_THREAD_LOCAL_P (op)
2478 || DECL_CONTEXT (op) == current_function_decl
2479 || decl_function_context (op) == current_function_decl)
2484 if ((TREE_STATIC (op) || DECL_EXTERNAL (op))
2485 || decl_function_context (op) == current_function_decl)
2496 /* Return whether OP is a DECL whose address is interprocedural-invariant. */
2499 decl_address_ip_invariant_p (const_tree op)
2501 /* The conditions below are slightly less strict than the one in
2504 switch (TREE_CODE (op))
2512 if (((TREE_STATIC (op) || DECL_EXTERNAL (op))
2513 && !DECL_DLLIMPORT_P (op))
2514 || DECL_THREAD_LOCAL_P (op))
2519 if ((TREE_STATIC (op) || DECL_EXTERNAL (op)))
2531 /* Return true if T is function-invariant (internal function, does
2532 not handle arithmetic; that's handled in skip_simple_arithmetic and
2533 tree_invariant_p). */
2535 static bool tree_invariant_p (tree t);
2538 tree_invariant_p_1 (tree t)
2542 if (TREE_CONSTANT (t)
2543 || (TREE_READONLY (t) && !TREE_SIDE_EFFECTS (t)))
2546 switch (TREE_CODE (t))
2552 op = TREE_OPERAND (t, 0);
2553 while (handled_component_p (op))
2555 switch (TREE_CODE (op))
2558 case ARRAY_RANGE_REF:
2559 if (!tree_invariant_p (TREE_OPERAND (op, 1))
2560 || TREE_OPERAND (op, 2) != NULL_TREE
2561 || TREE_OPERAND (op, 3) != NULL_TREE)
2566 if (TREE_OPERAND (op, 2) != NULL_TREE)
2572 op = TREE_OPERAND (op, 0);
2575 return CONSTANT_CLASS_P (op) || decl_address_invariant_p (op);
2584 /* Return true if T is function-invariant. */
2587 tree_invariant_p (tree t)
2589 tree inner = skip_simple_arithmetic (t);
2590 return tree_invariant_p_1 (inner);
2593 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
2594 Do this to any expression which may be used in more than one place,
2595 but must be evaluated only once.
2597 Normally, expand_expr would reevaluate the expression each time.
2598 Calling save_expr produces something that is evaluated and recorded
2599 the first time expand_expr is called on it. Subsequent calls to
2600 expand_expr just reuse the recorded value.
2602 The call to expand_expr that generates code that actually computes
2603 the value is the first call *at compile time*. Subsequent calls
2604 *at compile time* generate code to use the saved value.
2605 This produces correct result provided that *at run time* control
2606 always flows through the insns made by the first expand_expr
2607 before reaching the other places where the save_expr was evaluated.
2608 You, the caller of save_expr, must make sure this is so.
2610 Constants, and certain read-only nodes, are returned with no
2611 SAVE_EXPR because that is safe. Expressions containing placeholders
2612 are not touched; see tree.def for an explanation of what these
2616 save_expr (tree expr)
2618 tree t = fold (expr);
2621 /* If the tree evaluates to a constant, then we don't want to hide that
2622 fact (i.e. this allows further folding, and direct checks for constants).
2623 However, a read-only object that has side effects cannot be bypassed.
2624 Since it is no problem to reevaluate literals, we just return the
2626 inner = skip_simple_arithmetic (t);
2627 if (TREE_CODE (inner) == ERROR_MARK)
2630 if (tree_invariant_p_1 (inner))
2633 /* If INNER contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
2634 it means that the size or offset of some field of an object depends on
2635 the value within another field.
2637 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
2638 and some variable since it would then need to be both evaluated once and
2639 evaluated more than once. Front-ends must assure this case cannot
2640 happen by surrounding any such subexpressions in their own SAVE_EXPR
2641 and forcing evaluation at the proper time. */
2642 if (contains_placeholder_p (inner))
2645 t = build1 (SAVE_EXPR, TREE_TYPE (expr), t);
2646 SET_EXPR_LOCATION (t, EXPR_LOCATION (expr));
2648 /* This expression might be placed ahead of a jump to ensure that the
2649 value was computed on both sides of the jump. So make sure it isn't
2650 eliminated as dead. */
2651 TREE_SIDE_EFFECTS (t) = 1;
2655 /* Look inside EXPR and into any simple arithmetic operations. Return
2656 the innermost non-arithmetic node. */
2659 skip_simple_arithmetic (tree expr)
2663 /* We don't care about whether this can be used as an lvalue in this
2665 while (TREE_CODE (expr) == NON_LVALUE_EXPR)
2666 expr = TREE_OPERAND (expr, 0);
2668 /* If we have simple operations applied to a SAVE_EXPR or to a SAVE_EXPR and
2669 a constant, it will be more efficient to not make another SAVE_EXPR since
2670 it will allow better simplification and GCSE will be able to merge the
2671 computations if they actually occur. */
2675 if (UNARY_CLASS_P (inner))
2676 inner = TREE_OPERAND (inner, 0);
2677 else if (BINARY_CLASS_P (inner))
2679 if (tree_invariant_p (TREE_OPERAND (inner, 1)))
2680 inner = TREE_OPERAND (inner, 0);
2681 else if (tree_invariant_p (TREE_OPERAND (inner, 0)))
2682 inner = TREE_OPERAND (inner, 1);
2694 /* Return which tree structure is used by T. */
2696 enum tree_node_structure_enum
2697 tree_node_structure (const_tree t)
2699 const enum tree_code code = TREE_CODE (t);
2700 return tree_node_structure_for_code (code);
2703 /* Set various status flags when building a CALL_EXPR object T. */
2706 process_call_operands (tree t)
2708 bool side_effects = TREE_SIDE_EFFECTS (t);
2709 bool read_only = false;
2710 int i = call_expr_flags (t);
2712 /* Calls have side-effects, except those to const or pure functions. */
2713 if ((i & ECF_LOOPING_CONST_OR_PURE) || !(i & (ECF_CONST | ECF_PURE)))
2714 side_effects = true;
2715 /* Propagate TREE_READONLY of arguments for const functions. */
2719 if (!side_effects || read_only)
2720 for (i = 1; i < TREE_OPERAND_LENGTH (t); i++)
2722 tree op = TREE_OPERAND (t, i);
2723 if (op && TREE_SIDE_EFFECTS (op))
2724 side_effects = true;
2725 if (op && !TREE_READONLY (op) && !CONSTANT_CLASS_P (op))
2729 TREE_SIDE_EFFECTS (t) = side_effects;
2730 TREE_READONLY (t) = read_only;
2733 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
2734 or offset that depends on a field within a record. */
2737 contains_placeholder_p (const_tree exp)
2739 enum tree_code code;
2744 code = TREE_CODE (exp);
2745 if (code == PLACEHOLDER_EXPR)
2748 switch (TREE_CODE_CLASS (code))
2751 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
2752 position computations since they will be converted into a
2753 WITH_RECORD_EXPR involving the reference, which will assume
2754 here will be valid. */
2755 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));
2757 case tcc_exceptional:
2758 if (code == TREE_LIST)
2759 return (CONTAINS_PLACEHOLDER_P (TREE_VALUE (exp))
2760 || CONTAINS_PLACEHOLDER_P (TREE_CHAIN (exp)));
2765 case tcc_comparison:
2766 case tcc_expression:
2770 /* Ignoring the first operand isn't quite right, but works best. */
2771 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1));
2774 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0))
2775 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1))
2776 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 2)));
2779 /* The save_expr function never wraps anything containing
2780 a PLACEHOLDER_EXPR. */
2787 switch (TREE_CODE_LENGTH (code))
2790 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));
2792 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0))
2793 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1)));
2804 const_call_expr_arg_iterator iter;
2805 FOR_EACH_CONST_CALL_EXPR_ARG (arg, iter, exp)
2806 if (CONTAINS_PLACEHOLDER_P (arg))
2820 /* Return true if any part of the computation of TYPE involves a
2821 PLACEHOLDER_EXPR. This includes size, bounds, qualifiers
2822 (for QUAL_UNION_TYPE) and field positions. */
2825 type_contains_placeholder_1 (const_tree type)
2827 /* If the size contains a placeholder or the parent type (component type in
2828 the case of arrays) type involves a placeholder, this type does. */
2829 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type))
2830 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (type))
2831 || (TREE_TYPE (type) != 0
2832 && type_contains_placeholder_p (TREE_TYPE (type))))
2835 /* Now do type-specific checks. Note that the last part of the check above
2836 greatly limits what we have to do below. */
2837 switch (TREE_CODE (type))
2845 case REFERENCE_TYPE:
2853 case FIXED_POINT_TYPE:
2854 /* Here we just check the bounds. */
2855 return (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (type))
2856 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (type)));
2859 /* We're already checked the component type (TREE_TYPE), so just check
2861 return type_contains_placeholder_p (TYPE_DOMAIN (type));
2865 case QUAL_UNION_TYPE:
2869 for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
2870 if (TREE_CODE (field) == FIELD_DECL
2871 && (CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (field))
2872 || (TREE_CODE (type) == QUAL_UNION_TYPE
2873 && CONTAINS_PLACEHOLDER_P (DECL_QUALIFIER (field)))
2874 || type_contains_placeholder_p (TREE_TYPE (field))))
2886 type_contains_placeholder_p (tree type)
2890 /* If the contains_placeholder_bits field has been initialized,
2891 then we know the answer. */
2892 if (TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) > 0)
2893 return TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) - 1;
2895 /* Indicate that we've seen this type node, and the answer is false.
2896 This is what we want to return if we run into recursion via fields. */
2897 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) = 1;
2899 /* Compute the real value. */
2900 result = type_contains_placeholder_1 (type);
2902 /* Store the real value. */
2903 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) = result + 1;
2908 /* Push tree EXP onto vector QUEUE if it is not already present. */
2911 push_without_duplicates (tree exp, VEC (tree, heap) **queue)
2916 FOR_EACH_VEC_ELT (tree, *queue, i, iter)
2917 if (simple_cst_equal (iter, exp) == 1)
2921 VEC_safe_push (tree, heap, *queue, exp);
2924 /* Given a tree EXP, find all occurences of references to fields
2925 in a PLACEHOLDER_EXPR and place them in vector REFS without
2926 duplicates. Also record VAR_DECLs and CONST_DECLs. Note that
2927 we assume here that EXP contains only arithmetic expressions
2928 or CALL_EXPRs with PLACEHOLDER_EXPRs occurring only in their
2932 find_placeholder_in_expr (tree exp, VEC (tree, heap) **refs)
2934 enum tree_code code = TREE_CODE (exp);
2938 /* We handle TREE_LIST and COMPONENT_REF separately. */
2939 if (code == TREE_LIST)
2941 FIND_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp), refs);
2942 FIND_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp), refs);
2944 else if (code == COMPONENT_REF)
2946 for (inner = TREE_OPERAND (exp, 0);
2947 REFERENCE_CLASS_P (inner);
2948 inner = TREE_OPERAND (inner, 0))
2951 if (TREE_CODE (inner) == PLACEHOLDER_EXPR)
2952 push_without_duplicates (exp, refs);
2954 FIND_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), refs);
2957 switch (TREE_CODE_CLASS (code))
2962 case tcc_declaration:
2963 /* Variables allocated to static storage can stay. */
2964 if (!TREE_STATIC (exp))
2965 push_without_duplicates (exp, refs);
2968 case tcc_expression:
2969 /* This is the pattern built in ada/make_aligning_type. */
2970 if (code == ADDR_EXPR
2971 && TREE_CODE (TREE_OPERAND (exp, 0)) == PLACEHOLDER_EXPR)
2973 push_without_duplicates (exp, refs);
2977 /* Fall through... */
2979 case tcc_exceptional:
2982 case tcc_comparison:
2984 for (i = 0; i < TREE_CODE_LENGTH (code); i++)
2985 FIND_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, i), refs);
2989 for (i = 1; i < TREE_OPERAND_LENGTH (exp); i++)
2990 FIND_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, i), refs);
2998 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
2999 return a tree with all occurrences of references to F in a
3000 PLACEHOLDER_EXPR replaced by R. Also handle VAR_DECLs and
3001 CONST_DECLs. Note that we assume here that EXP contains only
3002 arithmetic expressions or CALL_EXPRs with PLACEHOLDER_EXPRs
3003 occurring only in their argument list. */
3006 substitute_in_expr (tree exp, tree f, tree r)
3008 enum tree_code code = TREE_CODE (exp);
3009 tree op0, op1, op2, op3;
3012 /* We handle TREE_LIST and COMPONENT_REF separately. */
3013 if (code == TREE_LIST)
3015 op0 = SUBSTITUTE_IN_EXPR (TREE_CHAIN (exp), f, r);
3016 op1 = SUBSTITUTE_IN_EXPR (TREE_VALUE (exp), f, r);
3017 if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
3020 return tree_cons (TREE_PURPOSE (exp), op1, op0);
3022 else if (code == COMPONENT_REF)
3026 /* If this expression is getting a value from a PLACEHOLDER_EXPR
3027 and it is the right field, replace it with R. */
3028 for (inner = TREE_OPERAND (exp, 0);
3029 REFERENCE_CLASS_P (inner);
3030 inner = TREE_OPERAND (inner, 0))
3034 op1 = TREE_OPERAND (exp, 1);
3036 if (TREE_CODE (inner) == PLACEHOLDER_EXPR && op1 == f)
3039 /* If this expression hasn't been completed let, leave it alone. */
3040 if (TREE_CODE (inner) == PLACEHOLDER_EXPR && !TREE_TYPE (inner))
3043 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
3044 if (op0 == TREE_OPERAND (exp, 0))
3048 = fold_build3 (COMPONENT_REF, TREE_TYPE (exp), op0, op1, NULL_TREE);
3051 switch (TREE_CODE_CLASS (code))
3056 case tcc_declaration:
3062 case tcc_expression:
3066 /* Fall through... */
3068 case tcc_exceptional:
3071 case tcc_comparison:
3073 switch (TREE_CODE_LENGTH (code))
3079 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
3080 if (op0 == TREE_OPERAND (exp, 0))
3083 new_tree = fold_build1 (code, TREE_TYPE (exp), op0);
3087 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
3088 op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
3090 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
3093 new_tree = fold_build2 (code, TREE_TYPE (exp), op0, op1);
3097 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
3098 op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
3099 op2 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 2), f, r);
3101 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
3102 && op2 == TREE_OPERAND (exp, 2))
3105 new_tree = fold_build3 (code, TREE_TYPE (exp), op0, op1, op2);
3109 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
3110 op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
3111 op2 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 2), f, r);
3112 op3 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 3), f, r);
3114 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
3115 && op2 == TREE_OPERAND (exp, 2)
3116 && op3 == TREE_OPERAND (exp, 3))
3120 = fold (build4 (code, TREE_TYPE (exp), op0, op1, op2, op3));
3132 new_tree = NULL_TREE;
3134 /* If we are trying to replace F with a constant, inline back
3135 functions which do nothing else than computing a value from
3136 the arguments they are passed. This makes it possible to
3137 fold partially or entirely the replacement expression. */
3138 if (CONSTANT_CLASS_P (r) && code == CALL_EXPR)
3140 tree t = maybe_inline_call_in_expr (exp);
3142 return SUBSTITUTE_IN_EXPR (t, f, r);
3145 for (i = 1; i < TREE_OPERAND_LENGTH (exp); i++)
3147 tree op = TREE_OPERAND (exp, i);
3148 tree new_op = SUBSTITUTE_IN_EXPR (op, f, r);
3152 new_tree = copy_node (exp);
3153 TREE_OPERAND (new_tree, i) = new_op;
3159 new_tree = fold (new_tree);
3160 if (TREE_CODE (new_tree) == CALL_EXPR)
3161 process_call_operands (new_tree);
3172 TREE_READONLY (new_tree) |= TREE_READONLY (exp);
3176 /* Similar, but look for a PLACEHOLDER_EXPR in EXP and find a replacement
3177 for it within OBJ, a tree that is an object or a chain of references. */
3180 substitute_placeholder_in_expr (tree exp, tree obj)
3182 enum tree_code code = TREE_CODE (exp);
3183 tree op0, op1, op2, op3;
3186 /* If this is a PLACEHOLDER_EXPR, see if we find a corresponding type
3187 in the chain of OBJ. */
3188 if (code == PLACEHOLDER_EXPR)
3190 tree need_type = TYPE_MAIN_VARIANT (TREE_TYPE (exp));
3193 for (elt = obj; elt != 0;
3194 elt = ((TREE_CODE (elt) == COMPOUND_EXPR
3195 || TREE_CODE (elt) == COND_EXPR)
3196 ? TREE_OPERAND (elt, 1)
3197 : (REFERENCE_CLASS_P (elt)
3198 || UNARY_CLASS_P (elt)
3199 || BINARY_CLASS_P (elt)
3200 || VL_EXP_CLASS_P (elt)
3201 || EXPRESSION_CLASS_P (elt))
3202 ? TREE_OPERAND (elt, 0) : 0))
3203 if (TYPE_MAIN_VARIANT (TREE_TYPE (elt)) == need_type)
3206 for (elt = obj; elt != 0;
3207 elt = ((TREE_CODE (elt) == COMPOUND_EXPR
3208 || TREE_CODE (elt) == COND_EXPR)
3209 ? TREE_OPERAND (elt, 1)
3210 : (REFERENCE_CLASS_P (elt)
3211 || UNARY_CLASS_P (elt)
3212 || BINARY_CLASS_P (elt)
3213 || VL_EXP_CLASS_P (elt)
3214 || EXPRESSION_CLASS_P (elt))
3215 ? TREE_OPERAND (elt, 0) : 0))
3216 if (POINTER_TYPE_P (TREE_TYPE (elt))
3217 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (elt)))
3219 return fold_build1 (INDIRECT_REF, need_type, elt);
3221 /* If we didn't find it, return the original PLACEHOLDER_EXPR. If it
3222 survives until RTL generation, there will be an error. */
3226 /* TREE_LIST is special because we need to look at TREE_VALUE
3227 and TREE_CHAIN, not TREE_OPERANDS. */
3228 else if (code == TREE_LIST)
3230 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp), obj);
3231 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp), obj);
3232 if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
3235 return tree_cons (TREE_PURPOSE (exp), op1, op0);
3238 switch (TREE_CODE_CLASS (code))
3241 case tcc_declaration:
3244 case tcc_exceptional:
3247 case tcc_comparison:
3248 case tcc_expression:
3251 switch (TREE_CODE_LENGTH (code))
3257 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
3258 if (op0 == TREE_OPERAND (exp, 0))
3261 new_tree = fold_build1 (code, TREE_TYPE (exp), op0);
3265 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
3266 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
3268 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
3271 new_tree = fold_build2 (code, TREE_TYPE (exp), op0, op1);
3275 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
3276 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
3277 op2 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 2), obj);
3279 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
3280 && op2 == TREE_OPERAND (exp, 2))
3283 new_tree = fold_build3 (code, TREE_TYPE (exp), op0, op1, op2);
3287 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
3288 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
3289 op2 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 2), obj);
3290 op3 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 3), obj);
3292 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
3293 && op2 == TREE_OPERAND (exp, 2)
3294 && op3 == TREE_OPERAND (exp, 3))
3298 = fold (build4 (code, TREE_TYPE (exp), op0, op1, op2, op3));
3310 new_tree = NULL_TREE;
3312 for (i = 1; i < TREE_OPERAND_LENGTH (exp); i++)
3314 tree op = TREE_OPERAND (exp, i);
3315 tree new_op = SUBSTITUTE_PLACEHOLDER_IN_EXPR (op, obj);
3319 new_tree = copy_node (exp);
3320 TREE_OPERAND (new_tree, i) = new_op;
3326 new_tree = fold (new_tree);
3327 if (TREE_CODE (new_tree) == CALL_EXPR)
3328 process_call_operands (new_tree);
3339 TREE_READONLY (new_tree) |= TREE_READONLY (exp);
3343 /* Stabilize a reference so that we can use it any number of times
3344 without causing its operands to be evaluated more than once.
3345 Returns the stabilized reference. This works by means of save_expr,
3346 so see the caveats in the comments about save_expr.
3348 Also allows conversion expressions whose operands are references.
3349 Any other kind of expression is returned unchanged. */
3352 stabilize_reference (tree ref)
3355 enum tree_code code = TREE_CODE (ref);
3362 /* No action is needed in this case. */
3367 case FIX_TRUNC_EXPR:
3368 result = build_nt (code, stabilize_reference (TREE_OPERAND (ref, 0)));
3372 result = build_nt (INDIRECT_REF,
3373 stabilize_reference_1 (TREE_OPERAND (ref, 0)));
3377 result = build_nt (COMPONENT_REF,
3378 stabilize_reference (TREE_OPERAND (ref, 0)),
3379 TREE_OPERAND (ref, 1), NULL_TREE);
3383 result = build_nt (BIT_FIELD_REF,
3384 stabilize_reference (TREE_OPERAND (ref, 0)),
3385 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
3386 stabilize_reference_1 (TREE_OPERAND (ref, 2)));
3390 result = build_nt (ARRAY_REF,
3391 stabilize_reference (TREE_OPERAND (ref, 0)),
3392 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
3393 TREE_OPERAND (ref, 2), TREE_OPERAND (ref, 3));
3396 case ARRAY_RANGE_REF:
3397 result = build_nt (ARRAY_RANGE_REF,
3398 stabilize_reference (TREE_OPERAND (ref, 0)),
3399 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
3400 TREE_OPERAND (ref, 2), TREE_OPERAND (ref, 3));
3404 /* We cannot wrap the first expression in a SAVE_EXPR, as then
3405 it wouldn't be ignored. This matters when dealing with
3407 return stabilize_reference_1 (ref);
3409 /* If arg isn't a kind of lvalue we recognize, make no change.
3410 Caller should recognize the error for an invalid lvalue. */
3415 return error_mark_node;
3418 TREE_TYPE (result) = TREE_TYPE (ref);
3419 TREE_READONLY (result) = TREE_READONLY (ref);
3420 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (ref);
3421 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);
3426 /* Subroutine of stabilize_reference; this is called for subtrees of
3427 references. Any expression with side-effects must be put in a SAVE_EXPR
3428 to ensure that it is only evaluated once.
3430 We don't put SAVE_EXPR nodes around everything, because assigning very
3431 simple expressions to temporaries causes us to miss good opportunities
3432 for optimizations. Among other things, the opportunity to fold in the
3433 addition of a constant into an addressing mode often gets lost, e.g.
3434 "y[i+1] += x;". In general, we take the approach that we should not make
3435 an assignment unless we are forced into it - i.e., that any non-side effect
3436 operator should be allowed, and that cse should take care of coalescing
3437 multiple utterances of the same expression should that prove fruitful. */
3440 stabilize_reference_1 (tree e)
3443 enum tree_code code = TREE_CODE (e);
3445 /* We cannot ignore const expressions because it might be a reference
3446 to a const array but whose index contains side-effects. But we can
3447 ignore things that are actual constant or that already have been
3448 handled by this function. */
3450 if (tree_invariant_p (e))
3453 switch (TREE_CODE_CLASS (code))
3455 case tcc_exceptional:
3457 case tcc_declaration:
3458 case tcc_comparison:
3460 case tcc_expression:
3463 /* If the expression has side-effects, then encase it in a SAVE_EXPR
3464 so that it will only be evaluated once. */
3465 /* The reference (r) and comparison (<) classes could be handled as
3466 below, but it is generally faster to only evaluate them once. */
3467 if (TREE_SIDE_EFFECTS (e))
3468 return save_expr (e);
3472 /* Constants need no processing. In fact, we should never reach
3477 /* Division is slow and tends to be compiled with jumps,
3478 especially the division by powers of 2 that is often
3479 found inside of an array reference. So do it just once. */
3480 if (code == TRUNC_DIV_EXPR || code == TRUNC_MOD_EXPR
3481 || code == FLOOR_DIV_EXPR || code == FLOOR_MOD_EXPR
3482 || code == CEIL_DIV_EXPR || code == CEIL_MOD_EXPR
3483 || code == ROUND_DIV_EXPR || code == ROUND_MOD_EXPR)
3484 return save_expr (e);
3485 /* Recursively stabilize each operand. */
3486 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)),
3487 stabilize_reference_1 (TREE_OPERAND (e, 1)));
3491 /* Recursively stabilize each operand. */
3492 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)));
3499 TREE_TYPE (result) = TREE_TYPE (e);
3500 TREE_READONLY (result) = TREE_READONLY (e);
3501 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (e);
3502 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);
3507 /* Low-level constructors for expressions. */
3509 /* A helper function for build1 and constant folders. Set TREE_CONSTANT,
3510 and TREE_SIDE_EFFECTS for an ADDR_EXPR. */
3513 recompute_tree_invariant_for_addr_expr (tree t)
3516 bool tc = true, se = false;
3518 /* We started out assuming this address is both invariant and constant, but
3519 does not have side effects. Now go down any handled components and see if
3520 any of them involve offsets that are either non-constant or non-invariant.
3521 Also check for side-effects.
3523 ??? Note that this code makes no attempt to deal with the case where
3524 taking the address of something causes a copy due to misalignment. */
3526 #define UPDATE_FLAGS(NODE) \
3527 do { tree _node = (NODE); \
3528 if (_node && !TREE_CONSTANT (_node)) tc = false; \
3529 if (_node && TREE_SIDE_EFFECTS (_node)) se = true; } while (0)
3531 for (node = TREE_OPERAND (t, 0); handled_component_p (node);
3532 node = TREE_OPERAND (node, 0))
3534 /* If the first operand doesn't have an ARRAY_TYPE, this is a bogus
3535 array reference (probably made temporarily by the G++ front end),
3536 so ignore all the operands. */
3537 if ((TREE_CODE (node) == ARRAY_REF
3538 || TREE_CODE (node) == ARRAY_RANGE_REF)
3539 && TREE_CODE (TREE_TYPE (TREE_OPERAND (node, 0))) == ARRAY_TYPE)
3541 UPDATE_FLAGS (TREE_OPERAND (node, 1));
3542 if (TREE_OPERAND (node, 2))
3543 UPDATE_FLAGS (TREE_OPERAND (node, 2));
3544 if (TREE_OPERAND (node, 3))
3545 UPDATE_FLAGS (TREE_OPERAND (node, 3));
3547 /* Likewise, just because this is a COMPONENT_REF doesn't mean we have a
3548 FIELD_DECL, apparently. The G++ front end can put something else
3549 there, at least temporarily. */
3550 else if (TREE_CODE (node) == COMPONENT_REF
3551 && TREE_CODE (TREE_OPERAND (node, 1)) == FIELD_DECL)
3553 if (TREE_OPERAND (node, 2))
3554 UPDATE_FLAGS (TREE_OPERAND (node, 2));
3556 else if (TREE_CODE (node) == BIT_FIELD_REF)
3557 UPDATE_FLAGS (TREE_OPERAND (node, 2));
3560 node = lang_hooks.expr_to_decl (node, &tc, &se);
3562 /* Now see what's inside. If it's an INDIRECT_REF, copy our properties from
3563 the address, since &(*a)->b is a form of addition. If it's a constant, the
3564 address is constant too. If it's a decl, its address is constant if the
3565 decl is static. Everything else is not constant and, furthermore,
3566 taking the address of a volatile variable is not volatile. */
3567 if (TREE_CODE (node) == INDIRECT_REF
3568 || TREE_CODE (node) == MEM_REF)
3569 UPDATE_FLAGS (TREE_OPERAND (node, 0));
3570 else if (CONSTANT_CLASS_P (node))
3572 else if (DECL_P (node))
3573 tc &= (staticp (node) != NULL_TREE);
3577 se |= TREE_SIDE_EFFECTS (node);
3581 TREE_CONSTANT (t) = tc;
3582 TREE_SIDE_EFFECTS (t) = se;
3586 /* Build an expression of code CODE, data type TYPE, and operands as
3587 specified. Expressions and reference nodes can be created this way.
3588 Constants, decls, types and misc nodes cannot be.
3590 We define 5 non-variadic functions, from 0 to 4 arguments. This is
3591 enough for all extant tree codes. */
3594 build0_stat (enum tree_code code, tree tt MEM_STAT_DECL)
3598 gcc_assert (TREE_CODE_LENGTH (code) == 0);
3600 t = make_node_stat (code PASS_MEM_STAT);
3607 build1_stat (enum tree_code code, tree type, tree node MEM_STAT_DECL)
3609 int length = sizeof (struct tree_exp);
3610 #ifdef GATHER_STATISTICS
3611 tree_node_kind kind;
3615 #ifdef GATHER_STATISTICS
3616 switch (TREE_CODE_CLASS (code))
3618 case tcc_statement: /* an expression with side effects */
3621 case tcc_reference: /* a reference */
3629 tree_node_counts[(int) kind]++;
3630 tree_node_sizes[(int) kind] += length;
3633 gcc_assert (TREE_CODE_LENGTH (code) == 1);
3635 t = ggc_alloc_zone_tree_node_stat (&tree_zone, length PASS_MEM_STAT);
3637 memset (t, 0, sizeof (struct tree_common));
3639 TREE_SET_CODE (t, code);
3641 TREE_TYPE (t) = type;
3642 SET_EXPR_LOCATION (t, UNKNOWN_LOCATION);
3643 TREE_OPERAND (t, 0) = node;
3644 TREE_BLOCK (t) = NULL_TREE;
3645 if (node && !TYPE_P (node))
3647 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (node);
3648 TREE_READONLY (t) = TREE_READONLY (node);
3651 if (TREE_CODE_CLASS (code) == tcc_statement)
3652 TREE_SIDE_EFFECTS (t) = 1;
3656 /* All of these have side-effects, no matter what their
3658 TREE_SIDE_EFFECTS (t) = 1;
3659 TREE_READONLY (t) = 0;
3663 /* Whether a dereference is readonly has nothing to do with whether
3664 its operand is readonly. */
3665 TREE_READONLY (t) = 0;
3670 recompute_tree_invariant_for_addr_expr (t);
3674 if ((TREE_CODE_CLASS (code) == tcc_unary || code == VIEW_CONVERT_EXPR)
3675 && node && !TYPE_P (node)
3676 && TREE_CONSTANT (node))
3677 TREE_CONSTANT (t) = 1;
3678 if (TREE_CODE_CLASS (code) == tcc_reference
3679 && node && TREE_THIS_VOLATILE (node))
3680 TREE_THIS_VOLATILE (t) = 1;
3687 #define PROCESS_ARG(N) \
3689 TREE_OPERAND (t, N) = arg##N; \
3690 if (arg##N &&!TYPE_P (arg##N)) \
3692 if (TREE_SIDE_EFFECTS (arg##N)) \
3694 if (!TREE_READONLY (arg##N) \
3695 && !CONSTANT_CLASS_P (arg##N)) \
3696 (void) (read_only = 0); \
3697 if (!TREE_CONSTANT (arg##N)) \
3698 (void) (constant = 0); \
3703 build2_stat (enum tree_code code, tree tt, tree arg0, tree arg1 MEM_STAT_DECL)
3705 bool constant, read_only, side_effects;
3708 gcc_assert (TREE_CODE_LENGTH (code) == 2);
3710 if ((code == MINUS_EXPR || code == PLUS_EXPR || code == MULT_EXPR)
3711 && arg0 && arg1 && tt && POINTER_TYPE_P (tt)
3712 /* When sizetype precision doesn't match that of pointers
3713 we need to be able to build explicit extensions or truncations
3714 of the offset argument. */
3715 && TYPE_PRECISION (sizetype) == TYPE_PRECISION (tt))
3716 gcc_assert (TREE_CODE (arg0) == INTEGER_CST
3717 && TREE_CODE (arg1) == INTEGER_CST);
3719 if (code == POINTER_PLUS_EXPR && arg0 && arg1 && tt)
3720 gcc_assert (POINTER_TYPE_P (tt) && POINTER_TYPE_P (TREE_TYPE (arg0))
3721 && INTEGRAL_TYPE_P (TREE_TYPE (arg1))
3722 && useless_type_conversion_p (sizetype, TREE_TYPE (arg1)));
3724 t = make_node_stat (code PASS_MEM_STAT);
3727 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
3728 result based on those same flags for the arguments. But if the
3729 arguments aren't really even `tree' expressions, we shouldn't be trying
3732 /* Expressions without side effects may be constant if their
3733 arguments are as well. */
3734 constant = (TREE_CODE_CLASS (code) == tcc_comparison
3735 || TREE_CODE_CLASS (code) == tcc_binary);
3737 side_effects = TREE_SIDE_EFFECTS (t);
3742 TREE_READONLY (t) = read_only;
3743 TREE_CONSTANT (t) = constant;
3744 TREE_SIDE_EFFECTS (t) = side_effects;
3745 TREE_THIS_VOLATILE (t)
3746 = (TREE_CODE_CLASS (code) == tcc_reference
3747 && arg0 && TREE_THIS_VOLATILE (arg0));
3754 build3_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
3755 tree arg2 MEM_STAT_DECL)
3757 bool constant, read_only, side_effects;
3760 gcc_assert (TREE_CODE_LENGTH (code) == 3);
3761 gcc_assert (TREE_CODE_CLASS (code) != tcc_vl_exp);
3763 t = make_node_stat (code PASS_MEM_STAT);
3768 /* As a special exception, if COND_EXPR has NULL branches, we
3769 assume that it is a gimple statement and always consider
3770 it to have side effects. */
3771 if (code == COND_EXPR
3772 && tt == void_type_node
3773 && arg1 == NULL_TREE
3774 && arg2 == NULL_TREE)
3775 side_effects = true;
3777 side_effects = TREE_SIDE_EFFECTS (t);
3783 if (code == COND_EXPR)
3784 TREE_READONLY (t) = read_only;
3786 TREE_SIDE_EFFECTS (t) = side_effects;
3787 TREE_THIS_VOLATILE (t)
3788 = (TREE_CODE_CLASS (code) == tcc_reference
3789 && arg0 && TREE_THIS_VOLATILE (arg0));
3795 build4_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
3796 tree arg2, tree arg3 MEM_STAT_DECL)
3798 bool constant, read_only, side_effects;
3801 gcc_assert (TREE_CODE_LENGTH (code) == 4);
3803 t = make_node_stat (code PASS_MEM_STAT);
3806 side_effects = TREE_SIDE_EFFECTS (t);
3813 TREE_SIDE_EFFECTS (t) = side_effects;
3814 TREE_THIS_VOLATILE (t)
3815 = (TREE_CODE_CLASS (code) == tcc_reference
3816 && arg0 && TREE_THIS_VOLATILE (arg0));
3822 build5_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
3823 tree arg2, tree arg3, tree arg4 MEM_STAT_DECL)
3825 bool constant, read_only, side_effects;
3828 gcc_assert (TREE_CODE_LENGTH (code) == 5);
3830 t = make_node_stat (code PASS_MEM_STAT);
3833 side_effects = TREE_SIDE_EFFECTS (t);
3841 TREE_SIDE_EFFECTS (t) = side_effects;
3842 TREE_THIS_VOLATILE (t)
3843 = (TREE_CODE_CLASS (code) == tcc_reference
3844 && arg0 && TREE_THIS_VOLATILE (arg0));
3850 build6_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
3851 tree arg2, tree arg3, tree arg4, tree arg5 MEM_STAT_DECL)
3853 bool constant, read_only, side_effects;
3856 gcc_assert (code == TARGET_MEM_REF);
3858 t = make_node_stat (code PASS_MEM_STAT);
3861 side_effects = TREE_SIDE_EFFECTS (t);
3868 if (code == TARGET_MEM_REF)
3872 TREE_SIDE_EFFECTS (t) = side_effects;
3873 TREE_THIS_VOLATILE (t)
3874 = (code == TARGET_MEM_REF
3875 && arg5 && TREE_THIS_VOLATILE (arg5));
3880 /* Build a simple MEM_REF tree with the sematics of a plain INDIRECT_REF
3881 on the pointer PTR. */
3884 build_simple_mem_ref_loc (location_t loc, tree ptr)
3886 HOST_WIDE_INT offset = 0;
3887 tree ptype = TREE_TYPE (ptr);
3889 /* For convenience allow addresses that collapse to a simple base
3891 if (TREE_CODE (ptr) == ADDR_EXPR
3892 && (handled_component_p (TREE_OPERAND (ptr, 0))
3893 || TREE_CODE (TREE_OPERAND (ptr, 0)) == MEM_REF))
3895 ptr = get_addr_base_and_unit_offset (TREE_OPERAND (ptr, 0), &offset);
3897 ptr = build_fold_addr_expr (ptr);
3898 gcc_assert (is_gimple_reg (ptr) || is_gimple_min_invariant (ptr));
3900 tem = build2 (MEM_REF, TREE_TYPE (ptype),
3901 ptr, build_int_cst (ptype, offset));
3902 SET_EXPR_LOCATION (tem, loc);
3906 /* Return the constant offset of a MEM_REF or TARGET_MEM_REF tree T. */
3909 mem_ref_offset (const_tree t)
3911 tree toff = TREE_OPERAND (t, 1);
3912 return double_int_sext (tree_to_double_int (toff),
3913 TYPE_PRECISION (TREE_TYPE (toff)));
3916 /* Return the pointer-type relevant for TBAA purposes from the
3917 gimple memory reference tree T. This is the type to be used for
3918 the offset operand of MEM_REF or TARGET_MEM_REF replacements of T. */
3921 reference_alias_ptr_type (const_tree t)
3923 const_tree base = t;
3924 while (handled_component_p (base))
3925 base = TREE_OPERAND (base, 0);
3926 if (TREE_CODE (base) == MEM_REF)
3927 return TREE_TYPE (TREE_OPERAND (base, 1));
3928 else if (TREE_CODE (base) == TARGET_MEM_REF)
3929 return TREE_TYPE (TMR_OFFSET (base));
3931 return build_pointer_type (TYPE_MAIN_VARIANT (TREE_TYPE (base)));
3934 /* Similar except don't specify the TREE_TYPE
3935 and leave the TREE_SIDE_EFFECTS as 0.
3936 It is permissible for arguments to be null,
3937 or even garbage if their values do not matter. */
3940 build_nt (enum tree_code code, ...)
3947 gcc_assert (TREE_CODE_CLASS (code) != tcc_vl_exp);
3951 t = make_node (code);
3952 length = TREE_CODE_LENGTH (code);
3954 for (i = 0; i < length; i++)
3955 TREE_OPERAND (t, i) = va_arg (p, tree);
3961 /* Similar to build_nt, but for creating a CALL_EXPR object with a
3965 build_nt_call_vec (tree fn, VEC(tree,gc) *args)
3970 ret = build_vl_exp (CALL_EXPR, VEC_length (tree, args) + 3);
3971 CALL_EXPR_FN (ret) = fn;
3972 CALL_EXPR_STATIC_CHAIN (ret) = NULL_TREE;
3973 FOR_EACH_VEC_ELT (tree, args, ix, t)
3974 CALL_EXPR_ARG (ret, ix) = t;
3978 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
3979 We do NOT enter this node in any sort of symbol table.
3981 LOC is the location of the decl.
3983 layout_decl is used to set up the decl's storage layout.
3984 Other slots are initialized to 0 or null pointers. */
3987 build_decl_stat (location_t loc, enum tree_code code, tree name,
3988 tree type MEM_STAT_DECL)
3992 t = make_node_stat (code PASS_MEM_STAT);
3993 DECL_SOURCE_LOCATION (t) = loc;
3995 /* if (type == error_mark_node)
3996 type = integer_type_node; */
3997 /* That is not done, deliberately, so that having error_mark_node
3998 as the type can suppress useless errors in the use of this variable. */
4000 DECL_NAME (t) = name;
4001 TREE_TYPE (t) = type;
4003 if (code == VAR_DECL || code == PARM_DECL || code == RESULT_DECL)
4009 /* Builds and returns function declaration with NAME and TYPE. */
4012 build_fn_decl (const char *name, tree type)
4014 tree id = get_identifier (name);
4015 tree decl = build_decl (input_location, FUNCTION_DECL, id, type);
4017 DECL_EXTERNAL (decl) = 1;
4018 TREE_PUBLIC (decl) = 1;
4019 DECL_ARTIFICIAL (decl) = 1;
4020 TREE_NOTHROW (decl) = 1;
4026 /* BLOCK nodes are used to represent the structure of binding contours
4027 and declarations, once those contours have been exited and their contents
4028 compiled. This information is used for outputting debugging info. */
4031 build_block (tree vars, tree subblocks, tree supercontext, tree chain)
4033 tree block = make_node (BLOCK);
4035 BLOCK_VARS (block) = vars;
4036 BLOCK_SUBBLOCKS (block) = subblocks;
4037 BLOCK_SUPERCONTEXT (block) = supercontext;
4038 BLOCK_CHAIN (block) = chain;
4043 /* Like SET_EXPR_LOCATION, but make sure the tree can have a location.
4045 LOC is the location to use in tree T. */
4048 protected_set_expr_location (tree t, location_t loc)
4050 if (t && CAN_HAVE_LOCATION_P (t))
4051 SET_EXPR_LOCATION (t, loc);
4054 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
4058 build_decl_attribute_variant (tree ddecl, tree attribute)
4060 DECL_ATTRIBUTES (ddecl) = attribute;
4064 /* Borrowed from hashtab.c iterative_hash implementation. */
4065 #define mix(a,b,c) \
4067 a -= b; a -= c; a ^= (c>>13); \
4068 b -= c; b -= a; b ^= (a<< 8); \
4069 c -= a; c -= b; c ^= ((b&0xffffffff)>>13); \
4070 a -= b; a -= c; a ^= ((c&0xffffffff)>>12); \
4071 b -= c; b -= a; b = (b ^ (a<<16)) & 0xffffffff; \
4072 c -= a; c -= b; c = (c ^ (b>> 5)) & 0xffffffff; \
4073 a -= b; a -= c; a = (a ^ (c>> 3)) & 0xffffffff; \
4074 b -= c; b -= a; b = (b ^ (a<<10)) & 0xffffffff; \
4075 c -= a; c -= b; c = (c ^ (b>>15)) & 0xffffffff; \
4079 /* Produce good hash value combining VAL and VAL2. */
4081 iterative_hash_hashval_t (hashval_t val, hashval_t val2)
4083 /* the golden ratio; an arbitrary value. */
4084 hashval_t a = 0x9e3779b9;
4090 /* Produce good hash value combining VAL and VAL2. */
4092 iterative_hash_host_wide_int (HOST_WIDE_INT val, hashval_t val2)
4094 if (sizeof (HOST_WIDE_INT) == sizeof (hashval_t))
4095 return iterative_hash_hashval_t (val, val2);
4098 hashval_t a = (hashval_t) val;
4099 /* Avoid warnings about shifting of more than the width of the type on
4100 hosts that won't execute this path. */
4102 hashval_t b = (hashval_t) (val >> (sizeof (hashval_t) * 8 + zero));
4104 if (sizeof (HOST_WIDE_INT) > 2 * sizeof (hashval_t))
4106 hashval_t a = (hashval_t) (val >> (sizeof (hashval_t) * 16 + zero));
4107 hashval_t b = (hashval_t) (val >> (sizeof (hashval_t) * 24 + zero));
4114 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
4115 is ATTRIBUTE and its qualifiers are QUALS.
4117 Record such modified types already made so we don't make duplicates. */
4120 build_type_attribute_qual_variant (tree ttype, tree attribute, int quals)
4122 if (! attribute_list_equal (TYPE_ATTRIBUTES (ttype), attribute))
4124 hashval_t hashcode = 0;
4126 enum tree_code code = TREE_CODE (ttype);
4128 /* Building a distinct copy of a tagged type is inappropriate; it
4129 causes breakage in code that expects there to be a one-to-one
4130 relationship between a struct and its fields.
4131 build_duplicate_type is another solution (as used in
4132 handle_transparent_union_attribute), but that doesn't play well
4133 with the stronger C++ type identity model. */
4134 if (TREE_CODE (ttype) == RECORD_TYPE
4135 || TREE_CODE (ttype) == UNION_TYPE
4136 || TREE_CODE (ttype) == QUAL_UNION_TYPE
4137 || TREE_CODE (ttype) == ENUMERAL_TYPE)
4139 warning (OPT_Wattributes,
4140 "ignoring attributes applied to %qT after definition",
4141 TYPE_MAIN_VARIANT (ttype));
4142 return build_qualified_type (ttype, quals);
4145 ttype = build_qualified_type (ttype, TYPE_UNQUALIFIED);
4146 ntype = build_distinct_type_copy (ttype);
4148 TYPE_ATTRIBUTES (ntype) = attribute;
4150 hashcode = iterative_hash_object (code, hashcode);
4151 if (TREE_TYPE (ntype))
4152 hashcode = iterative_hash_object (TYPE_HASH (TREE_TYPE (ntype)),
4154 hashcode = attribute_hash_list (attribute, hashcode);
4156 switch (TREE_CODE (ntype))
4159 hashcode = type_hash_list (TYPE_ARG_TYPES (ntype), hashcode);
4162 if (TYPE_DOMAIN (ntype))
4163 hashcode = iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (ntype)),
4167 hashcode = iterative_hash_object
4168 (TREE_INT_CST_LOW (TYPE_MAX_VALUE (ntype)), hashcode);
4169 hashcode = iterative_hash_object
4170 (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (ntype)), hashcode);
4173 case FIXED_POINT_TYPE:
4175 unsigned int precision = TYPE_PRECISION (ntype);
4176 hashcode = iterative_hash_object (precision, hashcode);
4183 ntype = type_hash_canon (hashcode, ntype);
4185 /* If the target-dependent attributes make NTYPE different from
4186 its canonical type, we will need to use structural equality
4187 checks for this type. */
4188 if (TYPE_STRUCTURAL_EQUALITY_P (ttype)
4189 || !targetm.comp_type_attributes (ntype, ttype))
4190 SET_TYPE_STRUCTURAL_EQUALITY (ntype);
4191 else if (TYPE_CANONICAL (ntype) == ntype)
4192 TYPE_CANONICAL (ntype) = TYPE_CANONICAL (ttype);
4194 ttype = build_qualified_type (ntype, quals);
4196 else if (TYPE_QUALS (ttype) != quals)
4197 ttype = build_qualified_type (ttype, quals);
4203 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
4206 Record such modified types already made so we don't make duplicates. */
4209 build_type_attribute_variant (tree ttype, tree attribute)
4211 return build_type_attribute_qual_variant (ttype, attribute,
4212 TYPE_QUALS (ttype));
4216 /* Reset the expression *EXPR_P, a size or position.
4218 ??? We could reset all non-constant sizes or positions. But it's cheap
4219 enough to not do so and refrain from adding workarounds to dwarf2out.c.
4221 We need to reset self-referential sizes or positions because they cannot
4222 be gimplified and thus can contain a CALL_EXPR after the gimplification
4223 is finished, which will run afoul of LTO streaming. And they need to be
4224 reset to something essentially dummy but not constant, so as to preserve
4225 the properties of the object they are attached to. */
4228 free_lang_data_in_one_sizepos (tree *expr_p)
4230 tree expr = *expr_p;
4231 if (CONTAINS_PLACEHOLDER_P (expr))
4232 *expr_p = build0 (PLACEHOLDER_EXPR, TREE_TYPE (expr));
4236 /* Reset all the fields in a binfo node BINFO. We only keep
4237 BINFO_VIRTUALS, which is used by gimple_fold_obj_type_ref. */
4240 free_lang_data_in_binfo (tree binfo)
4245 gcc_assert (TREE_CODE (binfo) == TREE_BINFO);
4247 BINFO_VTABLE (binfo) = NULL_TREE;
4248 BINFO_BASE_ACCESSES (binfo) = NULL;
4249 BINFO_INHERITANCE_CHAIN (binfo) = NULL_TREE;
4250 BINFO_SUBVTT_INDEX (binfo) = NULL_TREE;
4252 FOR_EACH_VEC_ELT (tree, BINFO_BASE_BINFOS (binfo), i, t)
4253 free_lang_data_in_binfo (t);
4257 /* Reset all language specific information still present in TYPE. */
4260 free_lang_data_in_type (tree type)
4262 gcc_assert (TYPE_P (type));
4264 /* Give the FE a chance to remove its own data first. */
4265 lang_hooks.free_lang_data (type);
4267 TREE_LANG_FLAG_0 (type) = 0;
4268 TREE_LANG_FLAG_1 (type) = 0;
4269 TREE_LANG_FLAG_2 (type) = 0;
4270 TREE_LANG_FLAG_3 (type) = 0;
4271 TREE_LANG_FLAG_4 (type) = 0;
4272 TREE_LANG_FLAG_5 (type) = 0;
4273 TREE_LANG_FLAG_6 (type) = 0;
4275 if (TREE_CODE (type) == FUNCTION_TYPE)
4277 /* Remove the const and volatile qualifiers from arguments. The
4278 C++ front end removes them, but the C front end does not,
4279 leading to false ODR violation errors when merging two
4280 instances of the same function signature compiled by
4281 different front ends. */
4284 for (p = TYPE_ARG_TYPES (type); p; p = TREE_CHAIN (p))
4286 tree arg_type = TREE_VALUE (p);
4288 if (TYPE_READONLY (arg_type) || TYPE_VOLATILE (arg_type))
4290 int quals = TYPE_QUALS (arg_type)
4292 & ~TYPE_QUAL_VOLATILE;
4293 TREE_VALUE (p) = build_qualified_type (arg_type, quals);
4294 free_lang_data_in_type (TREE_VALUE (p));
4299 /* Remove members that are not actually FIELD_DECLs from the field
4300 list of an aggregate. These occur in C++. */
4301 if (RECORD_OR_UNION_TYPE_P (type))
4305 /* Note that TYPE_FIELDS can be shared across distinct
4306 TREE_TYPEs. Therefore, if the first field of TYPE_FIELDS is
4307 to be removed, we cannot set its TREE_CHAIN to NULL.
4308 Otherwise, we would not be able to find all the other fields
4309 in the other instances of this TREE_TYPE.
4311 This was causing an ICE in testsuite/g++.dg/lto/20080915.C. */
4313 member = TYPE_FIELDS (type);
4316 if (TREE_CODE (member) == FIELD_DECL)
4319 TREE_CHAIN (prev) = member;
4321 TYPE_FIELDS (type) = member;
4325 member = TREE_CHAIN (member);
4329 TREE_CHAIN (prev) = NULL_TREE;
4331 TYPE_FIELDS (type) = NULL_TREE;
4333 TYPE_METHODS (type) = NULL_TREE;
4334 if (TYPE_BINFO (type))
4335 free_lang_data_in_binfo (TYPE_BINFO (type));
4339 /* For non-aggregate types, clear out the language slot (which
4340 overloads TYPE_BINFO). */
4341 TYPE_LANG_SLOT_1 (type) = NULL_TREE;
4343 if (INTEGRAL_TYPE_P (type)
4344 || SCALAR_FLOAT_TYPE_P (type)
4345 || FIXED_POINT_TYPE_P (type))
4347 free_lang_data_in_one_sizepos (&TYPE_MIN_VALUE (type));
4348 free_lang_data_in_one_sizepos (&TYPE_MAX_VALUE (type));
4352 free_lang_data_in_one_sizepos (&TYPE_SIZE (type));
4353 free_lang_data_in_one_sizepos (&TYPE_SIZE_UNIT (type));
4355 if (debug_info_level < DINFO_LEVEL_TERSE
4356 || (TYPE_CONTEXT (type)
4357 && TREE_CODE (TYPE_CONTEXT (type)) != FUNCTION_DECL
4358 && TREE_CODE (TYPE_CONTEXT (type)) != NAMESPACE_DECL))
4359 TYPE_CONTEXT (type) = NULL_TREE;
4361 if (debug_info_level < DINFO_LEVEL_TERSE)
4362 TYPE_STUB_DECL (type) = NULL_TREE;
4366 /* Return true if DECL may need an assembler name to be set. */
4369 need_assembler_name_p (tree decl)
4371 /* Only FUNCTION_DECLs and VAR_DECLs are considered. */
4372 if (TREE_CODE (decl) != FUNCTION_DECL
4373 && TREE_CODE (decl) != VAR_DECL)
4376 /* If DECL already has its assembler name set, it does not need a
4378 if (!HAS_DECL_ASSEMBLER_NAME_P (decl)
4379 || DECL_ASSEMBLER_NAME_SET_P (decl))
4382 /* Abstract decls do not need an assembler name. */
4383 if (DECL_ABSTRACT (decl))
4386 /* For VAR_DECLs, only static, public and external symbols need an
4388 if (TREE_CODE (decl) == VAR_DECL
4389 && !TREE_STATIC (decl)
4390 && !TREE_PUBLIC (decl)
4391 && !DECL_EXTERNAL (decl))
4394 if (TREE_CODE (decl) == FUNCTION_DECL)
4396 /* Do not set assembler name on builtins. Allow RTL expansion to
4397 decide whether to expand inline or via a regular call. */
4398 if (DECL_BUILT_IN (decl)
4399 && DECL_BUILT_IN_CLASS (decl) != BUILT_IN_FRONTEND)
4402 /* Functions represented in the callgraph need an assembler name. */
4403 if (cgraph_get_node (decl) != NULL)
4406 /* Unused and not public functions don't need an assembler name. */
4407 if (!TREE_USED (decl) && !TREE_PUBLIC (decl))
4415 /* Remove all the non-variable decls from BLOCK. LOCALS is the set of
4416 variables in DECL_STRUCT_FUNCTION (FN)->local_decls. Every decl
4417 in BLOCK that is not in LOCALS is removed. */
4420 free_lang_data_in_block (tree fn, tree block, struct pointer_set_t *locals)
4424 tp = &BLOCK_VARS (block);
4427 if (!pointer_set_contains (locals, *tp))
4428 *tp = TREE_CHAIN (*tp);
4430 tp = &TREE_CHAIN (*tp);
4433 for (t = BLOCK_SUBBLOCKS (block); t; t = BLOCK_CHAIN (t))
4434 free_lang_data_in_block (fn, t, locals);
4438 /* Reset all language specific information still present in symbol
4442 free_lang_data_in_decl (tree decl)
4444 gcc_assert (DECL_P (decl));
4446 /* Give the FE a chance to remove its own data first. */
4447 lang_hooks.free_lang_data (decl);
4449 TREE_LANG_FLAG_0 (decl) = 0;
4450 TREE_LANG_FLAG_1 (decl) = 0;
4451 TREE_LANG_FLAG_2 (decl) = 0;
4452 TREE_LANG_FLAG_3 (decl) = 0;
4453 TREE_LANG_FLAG_4 (decl) = 0;
4454 TREE_LANG_FLAG_5 (decl) = 0;
4455 TREE_LANG_FLAG_6 (decl) = 0;
4457 /* Identifiers need not have a type. */
4458 if (DECL_NAME (decl))
4459 TREE_TYPE (DECL_NAME (decl)) = NULL_TREE;
4461 /* Ignore any intervening types, because we are going to clear their
4462 TYPE_CONTEXT fields. */
4463 if (TREE_CODE (decl) != FIELD_DECL
4464 && TREE_CODE (decl) != FUNCTION_DECL)
4465 DECL_CONTEXT (decl) = decl_function_context (decl);
4467 if (DECL_CONTEXT (decl)
4468 && TREE_CODE (DECL_CONTEXT (decl)) == NAMESPACE_DECL)
4469 DECL_CONTEXT (decl) = NULL_TREE;
4471 if (TREE_CODE (decl) == VAR_DECL)
4473 tree context = DECL_CONTEXT (decl);
4477 enum tree_code code = TREE_CODE (context);
4478 if (code == FUNCTION_DECL && DECL_ABSTRACT (context))
4480 /* Do not clear the decl context here, that will promote
4481 all vars to global ones. */
4482 DECL_INITIAL (decl) = NULL_TREE;
4485 if (TREE_STATIC (decl))
4486 DECL_CONTEXT (decl) = NULL_TREE;
4490 free_lang_data_in_one_sizepos (&DECL_SIZE (decl));
4491 free_lang_data_in_one_sizepos (&DECL_SIZE_UNIT (decl));
4492 if (TREE_CODE (decl) == FIELD_DECL)
4493 free_lang_data_in_one_sizepos (&DECL_FIELD_OFFSET (decl));
4495 /* DECL_FCONTEXT is only used for debug info generation. */
4496 if (TREE_CODE (decl) == FIELD_DECL
4497 && debug_info_level < DINFO_LEVEL_TERSE)
4498 DECL_FCONTEXT (decl) = NULL_TREE;
4500 if (TREE_CODE (decl) == FUNCTION_DECL)
4502 if (gimple_has_body_p (decl))
4506 struct pointer_set_t *locals;
4508 /* If DECL has a gimple body, then the context for its
4509 arguments must be DECL. Otherwise, it doesn't really
4510 matter, as we will not be emitting any code for DECL. In
4511 general, there may be other instances of DECL created by
4512 the front end and since PARM_DECLs are generally shared,
4513 their DECL_CONTEXT changes as the replicas of DECL are
4514 created. The only time where DECL_CONTEXT is important
4515 is for the FUNCTION_DECLs that have a gimple body (since
4516 the PARM_DECL will be used in the function's body). */
4517 for (t = DECL_ARGUMENTS (decl); t; t = TREE_CHAIN (t))
4518 DECL_CONTEXT (t) = decl;
4520 /* Collect all the symbols declared in DECL. */
4521 locals = pointer_set_create ();
4522 FOR_EACH_LOCAL_DECL (DECL_STRUCT_FUNCTION (decl), ix, t)
4524 pointer_set_insert (locals, t);
4526 /* All the local symbols should have DECL as their
4528 DECL_CONTEXT (t) = decl;
4531 /* Get rid of any decl not in local_decls. */
4532 free_lang_data_in_block (decl, DECL_INITIAL (decl), locals);
4534 pointer_set_destroy (locals);
4537 /* DECL_SAVED_TREE holds the GENERIC representation for DECL.
4538 At this point, it is not needed anymore. */
4539 DECL_SAVED_TREE (decl) = NULL_TREE;
4541 else if (TREE_CODE (decl) == VAR_DECL)
4543 if (DECL_EXTERNAL (decl)
4544 && (!TREE_STATIC (decl) || !TREE_READONLY (decl)))
4545 DECL_INITIAL (decl) = NULL_TREE;
4547 else if (TREE_CODE (decl) == TYPE_DECL)
4549 DECL_INITIAL (decl) = NULL_TREE;
4551 /* DECL_CONTEXT is overloaded as DECL_FIELD_CONTEXT for
4552 FIELD_DECLs, which should be preserved. Otherwise,
4553 we shouldn't be concerned with source-level lexical
4554 nesting beyond this point. */
4555 DECL_CONTEXT (decl) = NULL_TREE;
4560 /* Data used when collecting DECLs and TYPEs for language data removal. */
4562 struct free_lang_data_d
4564 /* Worklist to avoid excessive recursion. */
4565 VEC(tree,heap) *worklist;
4567 /* Set of traversed objects. Used to avoid duplicate visits. */
4568 struct pointer_set_t *pset;
4570 /* Array of symbols to process with free_lang_data_in_decl. */
4571 VEC(tree,heap) *decls;
4573 /* Array of types to process with free_lang_data_in_type. */
4574 VEC(tree,heap) *types;
4578 /* Save all language fields needed to generate proper debug information
4579 for DECL. This saves most fields cleared out by free_lang_data_in_decl. */
4582 save_debug_info_for_decl (tree t)
4584 /*struct saved_debug_info_d *sdi;*/
4586 gcc_assert (debug_info_level > DINFO_LEVEL_TERSE && t && DECL_P (t));
4588 /* FIXME. Partial implementation for saving debug info removed. */
4592 /* Save all language fields needed to generate proper debug information
4593 for TYPE. This saves most fields cleared out by free_lang_data_in_type. */
4596 save_debug_info_for_type (tree t)
4598 /*struct saved_debug_info_d *sdi;*/
4600 gcc_assert (debug_info_level > DINFO_LEVEL_TERSE && t && TYPE_P (t));
4602 /* FIXME. Partial implementation for saving debug info removed. */
4606 /* Add type or decl T to one of the list of tree nodes that need their
4607 language data removed. The lists are held inside FLD. */
4610 add_tree_to_fld_list (tree t, struct free_lang_data_d *fld)
4614 VEC_safe_push (tree, heap, fld->decls, t);
4615 if (debug_info_level > DINFO_LEVEL_TERSE)
4616 save_debug_info_for_decl (t);
4618 else if (TYPE_P (t))
4620 VEC_safe_push (tree, heap, fld->types, t);
4621 if (debug_info_level > DINFO_LEVEL_TERSE)
4622 save_debug_info_for_type (t);
4628 /* Push tree node T into FLD->WORKLIST. */
4631 fld_worklist_push (tree t, struct free_lang_data_d *fld)
4633 if (t && !is_lang_specific (t) && !pointer_set_contains (fld->pset, t))
4634 VEC_safe_push (tree, heap, fld->worklist, (t));
4638 /* Operand callback helper for free_lang_data_in_node. *TP is the
4639 subtree operand being considered. */
4642 find_decls_types_r (tree *tp, int *ws, void *data)
4645 struct free_lang_data_d *fld = (struct free_lang_data_d *) data;
4647 if (TREE_CODE (t) == TREE_LIST)
4650 /* Language specific nodes will be removed, so there is no need
4651 to gather anything under them. */
4652 if (is_lang_specific (t))
4660 /* Note that walk_tree does not traverse every possible field in
4661 decls, so we have to do our own traversals here. */
4662 add_tree_to_fld_list (t, fld);
4664 fld_worklist_push (DECL_NAME (t), fld);
4665 fld_worklist_push (DECL_CONTEXT (t), fld);
4666 fld_worklist_push (DECL_SIZE (t), fld);
4667 fld_worklist_push (DECL_SIZE_UNIT (t), fld);
4669 /* We are going to remove everything under DECL_INITIAL for
4670 TYPE_DECLs. No point walking them. */
4671 if (TREE_CODE (t) != TYPE_DECL)
4672 fld_worklist_push (DECL_INITIAL (t), fld);
4674 fld_worklist_push (DECL_ATTRIBUTES (t), fld);
4675 fld_worklist_push (DECL_ABSTRACT_ORIGIN (t), fld);
4677 if (TREE_CODE (t) == FUNCTION_DECL)
4679 fld_worklist_push (DECL_ARGUMENTS (t), fld);
4680 fld_worklist_push (DECL_RESULT (t), fld);
4682 else if (TREE_CODE (t) == TYPE_DECL)
4684 fld_worklist_push (DECL_ARGUMENT_FLD (t), fld);
4685 fld_worklist_push (DECL_VINDEX (t), fld);
4687 else if (TREE_CODE (t) == FIELD_DECL)
4689 fld_worklist_push (DECL_FIELD_OFFSET (t), fld);
4690 fld_worklist_push (DECL_BIT_FIELD_TYPE (t), fld);
4691 fld_worklist_push (DECL_QUALIFIER (t), fld);
4692 fld_worklist_push (DECL_FIELD_BIT_OFFSET (t), fld);
4693 fld_worklist_push (DECL_FCONTEXT (t), fld);
4695 else if (TREE_CODE (t) == VAR_DECL)
4697 fld_worklist_push (DECL_SECTION_NAME (t), fld);
4698 fld_worklist_push (DECL_COMDAT_GROUP (t), fld);
4701 if ((TREE_CODE (t) == VAR_DECL || TREE_CODE (t) == PARM_DECL)
4702 && DECL_HAS_VALUE_EXPR_P (t))
4703 fld_worklist_push (DECL_VALUE_EXPR (t), fld);
4705 if (TREE_CODE (t) != FIELD_DECL
4706 && TREE_CODE (t) != TYPE_DECL)
4707 fld_worklist_push (TREE_CHAIN (t), fld);
4710 else if (TYPE_P (t))
4712 /* Note that walk_tree does not traverse every possible field in
4713 types, so we have to do our own traversals here. */
4714 add_tree_to_fld_list (t, fld);
4716 if (!RECORD_OR_UNION_TYPE_P (t))
4717 fld_worklist_push (TYPE_CACHED_VALUES (t), fld);
4718 fld_worklist_push (TYPE_SIZE (t), fld);
4719 fld_worklist_push (TYPE_SIZE_UNIT (t), fld);
4720 fld_worklist_push (TYPE_ATTRIBUTES (t), fld);
4721 fld_worklist_push (TYPE_POINTER_TO (t), fld);
4722 fld_worklist_push (TYPE_REFERENCE_TO (t), fld);
4723 fld_worklist_push (TYPE_NAME (t), fld);
4724 /* Do not walk TYPE_NEXT_PTR_TO or TYPE_NEXT_REF_TO. We do not stream
4725 them and thus do not and want not to reach unused pointer types
4727 if (!POINTER_TYPE_P (t))
4728 fld_worklist_push (TYPE_MINVAL (t), fld);
4729 if (!RECORD_OR_UNION_TYPE_P (t))
4730 fld_worklist_push (TYPE_MAXVAL (t), fld);
4731 fld_worklist_push (TYPE_MAIN_VARIANT (t), fld);
4732 /* Do not walk TYPE_NEXT_VARIANT. We do not stream it and thus
4733 do not and want not to reach unused variants this way. */
4734 fld_worklist_push (TYPE_CONTEXT (t), fld);
4735 /* Do not walk TYPE_CANONICAL. We do not stream it and thus do not
4736 and want not to reach unused types this way. */
4738 if (RECORD_OR_UNION_TYPE_P (t) && TYPE_BINFO (t))
4742 for (i = 0; VEC_iterate (tree, BINFO_BASE_BINFOS (TYPE_BINFO (t)),
4744 fld_worklist_push (TREE_TYPE (tem), fld);
4745 tem = BINFO_VIRTUALS (TYPE_BINFO (t));
4747 /* The Java FE overloads BINFO_VIRTUALS for its own purpose. */
4748 && TREE_CODE (tem) == TREE_LIST)
4751 fld_worklist_push (TREE_VALUE (tem), fld);
4752 tem = TREE_CHAIN (tem);
4756 if (RECORD_OR_UNION_TYPE_P (t))
4759 /* Push all TYPE_FIELDS - there can be interleaving interesting
4760 and non-interesting things. */
4761 tem = TYPE_FIELDS (t);
4764 if (TREE_CODE (tem) == FIELD_DECL)
4765 fld_worklist_push (tem, fld);
4766 tem = TREE_CHAIN (tem);
4770 fld_worklist_push (TREE_CHAIN (t), fld);
4773 else if (TREE_CODE (t) == BLOCK)
4776 for (tem = BLOCK_VARS (t); tem; tem = TREE_CHAIN (tem))
4777 fld_worklist_push (tem, fld);
4778 for (tem = BLOCK_SUBBLOCKS (t); tem; tem = BLOCK_CHAIN (tem))
4779 fld_worklist_push (tem, fld);
4780 fld_worklist_push (BLOCK_ABSTRACT_ORIGIN (t), fld);
4783 fld_worklist_push (TREE_TYPE (t), fld);
4789 /* Find decls and types in T. */
4792 find_decls_types (tree t, struct free_lang_data_d *fld)
4796 if (!pointer_set_contains (fld->pset, t))
4797 walk_tree (&t, find_decls_types_r, fld, fld->pset);
4798 if (VEC_empty (tree, fld->worklist))
4800 t = VEC_pop (tree, fld->worklist);
4804 /* Translate all the types in LIST with the corresponding runtime
4808 get_eh_types_for_runtime (tree list)
4812 if (list == NULL_TREE)
4815 head = build_tree_list (0, lookup_type_for_runtime (TREE_VALUE (list)));
4817 list = TREE_CHAIN (list);
4820 tree n = build_tree_list (0, lookup_type_for_runtime (TREE_VALUE (list)));
4821 TREE_CHAIN (prev) = n;
4822 prev = TREE_CHAIN (prev);
4823 list = TREE_CHAIN (list);
4830 /* Find decls and types referenced in EH region R and store them in
4831 FLD->DECLS and FLD->TYPES. */
4834 find_decls_types_in_eh_region (eh_region r, struct free_lang_data_d *fld)
4845 /* The types referenced in each catch must first be changed to the
4846 EH types used at runtime. This removes references to FE types
4848 for (c = r->u.eh_try.first_catch; c ; c = c->next_catch)
4850 c->type_list = get_eh_types_for_runtime (c->type_list);
4851 walk_tree (&c->type_list, find_decls_types_r, fld, fld->pset);
4856 case ERT_ALLOWED_EXCEPTIONS:
4857 r->u.allowed.type_list
4858 = get_eh_types_for_runtime (r->u.allowed.type_list);
4859 walk_tree (&r->u.allowed.type_list, find_decls_types_r, fld, fld->pset);
4862 case ERT_MUST_NOT_THROW:
4863 walk_tree (&r->u.must_not_throw.failure_decl,
4864 find_decls_types_r, fld, fld->pset);
4870 /* Find decls and types referenced in cgraph node N and store them in
4871 FLD->DECLS and FLD->TYPES. Unlike pass_referenced_vars, this will
4872 look for *every* kind of DECL and TYPE node reachable from N,
4873 including those embedded inside types and decls (i.e,, TYPE_DECLs,
4874 NAMESPACE_DECLs, etc). */
4877 find_decls_types_in_node (struct cgraph_node *n, struct free_lang_data_d *fld)
4880 struct function *fn;
4884 find_decls_types (n->decl, fld);
4886 if (!gimple_has_body_p (n->decl))
4889 gcc_assert (current_function_decl == NULL_TREE && cfun == NULL);
4891 fn = DECL_STRUCT_FUNCTION (n->decl);
4893 /* Traverse locals. */
4894 FOR_EACH_LOCAL_DECL (fn, ix, t)
4895 find_decls_types (t, fld);
4897 /* Traverse EH regions in FN. */
4900 FOR_ALL_EH_REGION_FN (r, fn)
4901 find_decls_types_in_eh_region (r, fld);
4904 /* Traverse every statement in FN. */
4905 FOR_EACH_BB_FN (bb, fn)
4907 gimple_stmt_iterator si;
4910 for (si = gsi_start_phis (bb); !gsi_end_p (si); gsi_next (&si))
4912 gimple phi = gsi_stmt (si);
4914 for (i = 0; i < gimple_phi_num_args (phi); i++)
4916 tree *arg_p = gimple_phi_arg_def_ptr (phi, i);
4917 find_decls_types (*arg_p, fld);
4921 for (si = gsi_start_bb (bb); !gsi_end_p (si); gsi_next (&si))
4923 gimple stmt = gsi_stmt (si);
4925 for (i = 0; i < gimple_num_ops (stmt); i++)
4927 tree arg = gimple_op (stmt, i);
4928 find_decls_types (arg, fld);
4935 /* Find decls and types referenced in varpool node N and store them in
4936 FLD->DECLS and FLD->TYPES. Unlike pass_referenced_vars, this will
4937 look for *every* kind of DECL and TYPE node reachable from N,
4938 including those embedded inside types and decls (i.e,, TYPE_DECLs,
4939 NAMESPACE_DECLs, etc). */
4942 find_decls_types_in_var (struct varpool_node *v, struct free_lang_data_d *fld)
4944 find_decls_types (v->decl, fld);
4947 /* If T needs an assembler name, have one created for it. */
4950 assign_assembler_name_if_neeeded (tree t)
4952 if (need_assembler_name_p (t))
4954 /* When setting DECL_ASSEMBLER_NAME, the C++ mangler may emit
4955 diagnostics that use input_location to show locus
4956 information. The problem here is that, at this point,
4957 input_location is generally anchored to the end of the file
4958 (since the parser is long gone), so we don't have a good
4959 position to pin it to.
4961 To alleviate this problem, this uses the location of T's
4962 declaration. Examples of this are
4963 testsuite/g++.dg/template/cond2.C and
4964 testsuite/g++.dg/template/pr35240.C. */
4965 location_t saved_location = input_location;
4966 input_location = DECL_SOURCE_LOCATION (t);
4968 decl_assembler_name (t);
4970 input_location = saved_location;
4975 /* Free language specific information for every operand and expression
4976 in every node of the call graph. This process operates in three stages:
4978 1- Every callgraph node and varpool node is traversed looking for
4979 decls and types embedded in them. This is a more exhaustive
4980 search than that done by find_referenced_vars, because it will
4981 also collect individual fields, decls embedded in types, etc.
4983 2- All the decls found are sent to free_lang_data_in_decl.
4985 3- All the types found are sent to free_lang_data_in_type.
4987 The ordering between decls and types is important because
4988 free_lang_data_in_decl sets assembler names, which includes
4989 mangling. So types cannot be freed up until assembler names have
4993 free_lang_data_in_cgraph (void)
4995 struct cgraph_node *n;
4996 struct varpool_node *v;
4997 struct free_lang_data_d fld;
5002 /* Initialize sets and arrays to store referenced decls and types. */
5003 fld.pset = pointer_set_create ();
5004 fld.worklist = NULL;
5005 fld.decls = VEC_alloc (tree, heap, 100);
5006 fld.types = VEC_alloc (tree, heap, 100);
5008 /* Find decls and types in the body of every function in the callgraph. */
5009 for (n = cgraph_nodes; n; n = n->next)
5010 find_decls_types_in_node (n, &fld);
5012 FOR_EACH_VEC_ELT (alias_pair, alias_pairs, i, p)
5013 find_decls_types (p->decl, &fld);
5015 /* Find decls and types in every varpool symbol. */
5016 for (v = varpool_nodes_queue; v; v = v->next_needed)
5017 find_decls_types_in_var (v, &fld);
5019 /* Set the assembler name on every decl found. We need to do this
5020 now because free_lang_data_in_decl will invalidate data needed
5021 for mangling. This breaks mangling on interdependent decls. */
5022 FOR_EACH_VEC_ELT (tree, fld.decls, i, t)
5023 assign_assembler_name_if_neeeded (t);
5025 /* Traverse every decl found freeing its language data. */
5026 FOR_EACH_VEC_ELT (tree, fld.decls, i, t)
5027 free_lang_data_in_decl (t);
5029 /* Traverse every type found freeing its language data. */
5030 FOR_EACH_VEC_ELT (tree, fld.types, i, t)
5031 free_lang_data_in_type (t);
5033 pointer_set_destroy (fld.pset);
5034 VEC_free (tree, heap, fld.worklist);
5035 VEC_free (tree, heap, fld.decls);
5036 VEC_free (tree, heap, fld.types);
5040 /* Free resources that are used by FE but are not needed once they are done. */
5043 free_lang_data (void)
5047 /* If we are the LTO frontend we have freed lang-specific data already. */
5049 || !flag_generate_lto)
5052 /* Allocate and assign alias sets to the standard integer types
5053 while the slots are still in the way the frontends generated them. */
5054 for (i = 0; i < itk_none; ++i)
5055 if (integer_types[i])
5056 TYPE_ALIAS_SET (integer_types[i]) = get_alias_set (integer_types[i]);
5058 /* Traverse the IL resetting language specific information for
5059 operands, expressions, etc. */
5060 free_lang_data_in_cgraph ();
5062 /* Create gimple variants for common types. */
5063 ptrdiff_type_node = integer_type_node;
5064 fileptr_type_node = ptr_type_node;
5065 if (TREE_CODE (boolean_type_node) != BOOLEAN_TYPE
5066 || (TYPE_MODE (boolean_type_node)
5067 != mode_for_size (BOOL_TYPE_SIZE, MODE_INT, 0))
5068 || TYPE_PRECISION (boolean_type_node) != 1
5069 || !TYPE_UNSIGNED (boolean_type_node))
5071 boolean_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
5072 TREE_SET_CODE (boolean_type_node, BOOLEAN_TYPE);
5073 TYPE_MAX_VALUE (boolean_type_node) = build_int_cst (boolean_type_node, 1);
5074 TYPE_PRECISION (boolean_type_node) = 1;
5075 boolean_false_node = TYPE_MIN_VALUE (boolean_type_node);
5076 boolean_true_node = TYPE_MAX_VALUE (boolean_type_node);
5079 /* Unify char_type_node with its properly signed variant. */
5080 if (TYPE_UNSIGNED (char_type_node))
5081 unsigned_char_type_node = char_type_node;
5083 signed_char_type_node = char_type_node;
5085 /* Reset some langhooks. Do not reset types_compatible_p, it may
5086 still be used indirectly via the get_alias_set langhook. */
5087 lang_hooks.callgraph.analyze_expr = NULL;
5088 lang_hooks.dwarf_name = lhd_dwarf_name;
5089 lang_hooks.decl_printable_name = gimple_decl_printable_name;
5090 lang_hooks.set_decl_assembler_name = lhd_set_decl_assembler_name;
5092 /* Reset diagnostic machinery. */
5093 diagnostic_starter (global_dc) = default_tree_diagnostic_starter;
5094 diagnostic_finalizer (global_dc) = default_diagnostic_finalizer;
5095 diagnostic_format_decoder (global_dc) = default_tree_printer;
5101 struct simple_ipa_opt_pass pass_ipa_free_lang_data =
5105 "*free_lang_data", /* name */
5107 free_lang_data, /* execute */
5110 0, /* static_pass_number */
5111 TV_IPA_FREE_LANG_DATA, /* tv_id */
5112 0, /* properties_required */
5113 0, /* properties_provided */
5114 0, /* properties_destroyed */
5115 0, /* todo_flags_start */
5116 TODO_ggc_collect /* todo_flags_finish */
5120 /* Return nonzero if IDENT is a valid name for attribute ATTR,
5123 We try both `text' and `__text__', ATTR may be either one. */
5124 /* ??? It might be a reasonable simplification to require ATTR to be only
5125 `text'. One might then also require attribute lists to be stored in
5126 their canonicalized form. */
5129 is_attribute_with_length_p (const char *attr, int attr_len, const_tree ident)
5134 if (TREE_CODE (ident) != IDENTIFIER_NODE)
5137 p = IDENTIFIER_POINTER (ident);
5138 ident_len = IDENTIFIER_LENGTH (ident);
5140 if (ident_len == attr_len
5141 && strcmp (attr, p) == 0)
5144 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
5147 gcc_assert (attr[1] == '_');
5148 gcc_assert (attr[attr_len - 2] == '_');
5149 gcc_assert (attr[attr_len - 1] == '_');
5150 if (ident_len == attr_len - 4
5151 && strncmp (attr + 2, p, attr_len - 4) == 0)
5156 if (ident_len == attr_len + 4
5157 && p[0] == '_' && p[1] == '_'
5158 && p[ident_len - 2] == '_' && p[ident_len - 1] == '_'
5159 && strncmp (attr, p + 2, attr_len) == 0)
5166 /* Return nonzero if IDENT is a valid name for attribute ATTR,
5169 We try both `text' and `__text__', ATTR may be either one. */
5172 is_attribute_p (const char *attr, const_tree ident)
5174 return is_attribute_with_length_p (attr, strlen (attr), ident);
5177 /* Given an attribute name and a list of attributes, return a pointer to the
5178 attribute's list element if the attribute is part of the list, or NULL_TREE
5179 if not found. If the attribute appears more than once, this only
5180 returns the first occurrence; the TREE_CHAIN of the return value should
5181 be passed back in if further occurrences are wanted. */
5184 lookup_attribute (const char *attr_name, tree list)
5187 size_t attr_len = strlen (attr_name);
5189 for (l = list; l; l = TREE_CHAIN (l))
5191 gcc_assert (TREE_CODE (TREE_PURPOSE (l)) == IDENTIFIER_NODE);
5192 if (is_attribute_with_length_p (attr_name, attr_len, TREE_PURPOSE (l)))
5198 /* Remove any instances of attribute ATTR_NAME in LIST and return the
5202 remove_attribute (const char *attr_name, tree list)
5205 size_t attr_len = strlen (attr_name);
5207 for (p = &list; *p; )
5210 gcc_assert (TREE_CODE (TREE_PURPOSE (l)) == IDENTIFIER_NODE);
5211 if (is_attribute_with_length_p (attr_name, attr_len, TREE_PURPOSE (l)))
5212 *p = TREE_CHAIN (l);
5214 p = &TREE_CHAIN (l);
5220 /* Return an attribute list that is the union of a1 and a2. */
5223 merge_attributes (tree a1, tree a2)
5227 /* Either one unset? Take the set one. */
5229 if ((attributes = a1) == 0)
5232 /* One that completely contains the other? Take it. */
5234 else if (a2 != 0 && ! attribute_list_contained (a1, a2))
5236 if (attribute_list_contained (a2, a1))
5240 /* Pick the longest list, and hang on the other list. */
5242 if (list_length (a1) < list_length (a2))
5243 attributes = a2, a2 = a1;
5245 for (; a2 != 0; a2 = TREE_CHAIN (a2))
5248 for (a = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)),
5251 a = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)),
5254 if (TREE_VALUE (a) != NULL
5255 && TREE_CODE (TREE_VALUE (a)) == TREE_LIST
5256 && TREE_VALUE (a2) != NULL
5257 && TREE_CODE (TREE_VALUE (a2)) == TREE_LIST)
5259 if (simple_cst_list_equal (TREE_VALUE (a),
5260 TREE_VALUE (a2)) == 1)
5263 else if (simple_cst_equal (TREE_VALUE (a),
5264 TREE_VALUE (a2)) == 1)
5269 a1 = copy_node (a2);
5270 TREE_CHAIN (a1) = attributes;
5279 /* Given types T1 and T2, merge their attributes and return
5283 merge_type_attributes (tree t1, tree t2)
5285 return merge_attributes (TYPE_ATTRIBUTES (t1),
5286 TYPE_ATTRIBUTES (t2));
5289 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
5293 merge_decl_attributes (tree olddecl, tree newdecl)
5295 return merge_attributes (DECL_ATTRIBUTES (olddecl),
5296 DECL_ATTRIBUTES (newdecl));
5299 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
5301 /* Specialization of merge_decl_attributes for various Windows targets.
5303 This handles the following situation:
5305 __declspec (dllimport) int foo;
5308 The second instance of `foo' nullifies the dllimport. */
5311 merge_dllimport_decl_attributes (tree old, tree new_tree)
5314 int delete_dllimport_p = 1;
5316 /* What we need to do here is remove from `old' dllimport if it doesn't
5317 appear in `new'. dllimport behaves like extern: if a declaration is
5318 marked dllimport and a definition appears later, then the object
5319 is not dllimport'd. We also remove a `new' dllimport if the old list
5320 contains dllexport: dllexport always overrides dllimport, regardless
5321 of the order of declaration. */
5322 if (!VAR_OR_FUNCTION_DECL_P (new_tree))
5323 delete_dllimport_p = 0;
5324 else if (DECL_DLLIMPORT_P (new_tree)
5325 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (old)))
5327 DECL_DLLIMPORT_P (new_tree) = 0;
5328 warning (OPT_Wattributes, "%q+D already declared with dllexport attribute: "
5329 "dllimport ignored", new_tree);
5331 else if (DECL_DLLIMPORT_P (old) && !DECL_DLLIMPORT_P (new_tree))
5333 /* Warn about overriding a symbol that has already been used, e.g.:
5334 extern int __attribute__ ((dllimport)) foo;
5335 int* bar () {return &foo;}
5338 if (TREE_USED (old))
5340 warning (0, "%q+D redeclared without dllimport attribute "
5341 "after being referenced with dll linkage", new_tree);
5342 /* If we have used a variable's address with dllimport linkage,
5343 keep the old DECL_DLLIMPORT_P flag: the ADDR_EXPR using the
5344 decl may already have had TREE_CONSTANT computed.
5345 We still remove the attribute so that assembler code refers
5346 to '&foo rather than '_imp__foo'. */
5347 if (TREE_CODE (old) == VAR_DECL && TREE_ADDRESSABLE (old))
5348 DECL_DLLIMPORT_P (new_tree) = 1;
5351 /* Let an inline definition silently override the external reference,
5352 but otherwise warn about attribute inconsistency. */
5353 else if (TREE_CODE (new_tree) == VAR_DECL
5354 || !DECL_DECLARED_INLINE_P (new_tree))
5355 warning (OPT_Wattributes, "%q+D redeclared without dllimport attribute: "
5356 "previous dllimport ignored", new_tree);
5359 delete_dllimport_p = 0;
5361 a = merge_attributes (DECL_ATTRIBUTES (old), DECL_ATTRIBUTES (new_tree));
5363 if (delete_dllimport_p)
5366 const size_t attr_len = strlen ("dllimport");
5368 /* Scan the list for dllimport and delete it. */
5369 for (prev = NULL_TREE, t = a; t; prev = t, t = TREE_CHAIN (t))
5371 if (is_attribute_with_length_p ("dllimport", attr_len,
5374 if (prev == NULL_TREE)
5377 TREE_CHAIN (prev) = TREE_CHAIN (t);
5386 /* Handle a "dllimport" or "dllexport" attribute; arguments as in
5387 struct attribute_spec.handler. */
5390 handle_dll_attribute (tree * pnode, tree name, tree args, int flags,
5396 /* These attributes may apply to structure and union types being created,
5397 but otherwise should pass to the declaration involved. */
5400 if (flags & ((int) ATTR_FLAG_DECL_NEXT | (int) ATTR_FLAG_FUNCTION_NEXT
5401 | (int) ATTR_FLAG_ARRAY_NEXT))
5403 *no_add_attrs = true;
5404 return tree_cons (name, args, NULL_TREE);
5406 if (TREE_CODE (node) == RECORD_TYPE
5407 || TREE_CODE (node) == UNION_TYPE)
5409 node = TYPE_NAME (node);
5415 warning (OPT_Wattributes, "%qE attribute ignored",
5417 *no_add_attrs = true;
5422 if (TREE_CODE (node) != FUNCTION_DECL
5423 && TREE_CODE (node) != VAR_DECL
5424 && TREE_CODE (node) != TYPE_DECL)
5426 *no_add_attrs = true;
5427 warning (OPT_Wattributes, "%qE attribute ignored",
5432 if (TREE_CODE (node) == TYPE_DECL
5433 && TREE_CODE (TREE_TYPE (node)) != RECORD_TYPE
5434 && TREE_CODE (TREE_TYPE (node)) != UNION_TYPE)
5436 *no_add_attrs = true;
5437 warning (OPT_Wattributes, "%qE attribute ignored",
5442 is_dllimport = is_attribute_p ("dllimport", name);
5444 /* Report error on dllimport ambiguities seen now before they cause
5448 /* Honor any target-specific overrides. */
5449 if (!targetm.valid_dllimport_attribute_p (node))
5450 *no_add_attrs = true;
5452 else if (TREE_CODE (node) == FUNCTION_DECL
5453 && DECL_DECLARED_INLINE_P (node))
5455 warning (OPT_Wattributes, "inline function %q+D declared as "
5456 " dllimport: attribute ignored", node);
5457 *no_add_attrs = true;
5459 /* Like MS, treat definition of dllimported variables and
5460 non-inlined functions on declaration as syntax errors. */
5461 else if (TREE_CODE (node) == FUNCTION_DECL && DECL_INITIAL (node))
5463 error ("function %q+D definition is marked dllimport", node);
5464 *no_add_attrs = true;
5467 else if (TREE_CODE (node) == VAR_DECL)
5469 if (DECL_INITIAL (node))
5471 error ("variable %q+D definition is marked dllimport",
5473 *no_add_attrs = true;
5476 /* `extern' needn't be specified with dllimport.
5477 Specify `extern' now and hope for the best. Sigh. */
5478 DECL_EXTERNAL (node) = 1;
5479 /* Also, implicitly give dllimport'd variables declared within
5480 a function global scope, unless declared static. */
5481 if (current_function_decl != NULL_TREE && !TREE_STATIC (node))
5482 TREE_PUBLIC (node) = 1;
5485 if (*no_add_attrs == false)
5486 DECL_DLLIMPORT_P (node) = 1;
5488 else if (TREE_CODE (node) == FUNCTION_DECL
5489 && DECL_DECLARED_INLINE_P (node))
5490 /* An exported function, even if inline, must be emitted. */
5491 DECL_EXTERNAL (node) = 0;
5493 /* Report error if symbol is not accessible at global scope. */
5494 if (!TREE_PUBLIC (node)
5495 && (TREE_CODE (node) == VAR_DECL
5496 || TREE_CODE (node) == FUNCTION_DECL))
5498 error ("external linkage required for symbol %q+D because of "
5499 "%qE attribute", node, name);
5500 *no_add_attrs = true;
5503 /* A dllexport'd entity must have default visibility so that other
5504 program units (shared libraries or the main executable) can see
5505 it. A dllimport'd entity must have default visibility so that
5506 the linker knows that undefined references within this program
5507 unit can be resolved by the dynamic linker. */
5510 if (DECL_VISIBILITY_SPECIFIED (node)
5511 && DECL_VISIBILITY (node) != VISIBILITY_DEFAULT)
5512 error ("%qE implies default visibility, but %qD has already "
5513 "been declared with a different visibility",
5515 DECL_VISIBILITY (node) = VISIBILITY_DEFAULT;
5516 DECL_VISIBILITY_SPECIFIED (node) = 1;
5522 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
5524 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
5525 of the various TYPE_QUAL values. */
5528 set_type_quals (tree type, int type_quals)
5530 TYPE_READONLY (type) = (type_quals & TYPE_QUAL_CONST) != 0;
5531 TYPE_VOLATILE (type) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
5532 TYPE_RESTRICT (type) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
5533 TYPE_ADDR_SPACE (type) = DECODE_QUAL_ADDR_SPACE (type_quals);
5536 /* Returns true iff CAND is equivalent to BASE with TYPE_QUALS. */
5539 check_qualified_type (const_tree cand, const_tree base, int type_quals)
5541 return (TYPE_QUALS (cand) == type_quals
5542 && TYPE_NAME (cand) == TYPE_NAME (base)
5543 /* Apparently this is needed for Objective-C. */
5544 && TYPE_CONTEXT (cand) == TYPE_CONTEXT (base)
5545 /* Check alignment. */
5546 && TYPE_ALIGN (cand) == TYPE_ALIGN (base)
5547 && attribute_list_equal (TYPE_ATTRIBUTES (cand),
5548 TYPE_ATTRIBUTES (base)));
5551 /* Returns true iff CAND is equivalent to BASE with ALIGN. */
5554 check_aligned_type (const_tree cand, const_tree base, unsigned int align)
5556 return (TYPE_QUALS (cand) == TYPE_QUALS (base)
5557 && TYPE_NAME (cand) == TYPE_NAME (base)
5558 /* Apparently this is needed for Objective-C. */
5559 && TYPE_CONTEXT (cand) == TYPE_CONTEXT (base)
5560 /* Check alignment. */
5561 && TYPE_ALIGN (cand) == align
5562 && attribute_list_equal (TYPE_ATTRIBUTES (cand),
5563 TYPE_ATTRIBUTES (base)));
5566 /* Return a version of the TYPE, qualified as indicated by the
5567 TYPE_QUALS, if one exists. If no qualified version exists yet,
5568 return NULL_TREE. */
5571 get_qualified_type (tree type, int type_quals)
5575 if (TYPE_QUALS (type) == type_quals)
5578 /* Search the chain of variants to see if there is already one there just
5579 like the one we need to have. If so, use that existing one. We must
5580 preserve the TYPE_NAME, since there is code that depends on this. */
5581 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
5582 if (check_qualified_type (t, type, type_quals))
5588 /* Like get_qualified_type, but creates the type if it does not
5589 exist. This function never returns NULL_TREE. */
5592 build_qualified_type (tree type, int type_quals)
5596 /* See if we already have the appropriate qualified variant. */
5597 t = get_qualified_type (type, type_quals);
5599 /* If not, build it. */
5602 t = build_variant_type_copy (type);
5603 set_type_quals (t, type_quals);
5605 if (TYPE_STRUCTURAL_EQUALITY_P (type))
5606 /* Propagate structural equality. */
5607 SET_TYPE_STRUCTURAL_EQUALITY (t);
5608 else if (TYPE_CANONICAL (type) != type)
5609 /* Build the underlying canonical type, since it is different
5611 TYPE_CANONICAL (t) = build_qualified_type (TYPE_CANONICAL (type),
5614 /* T is its own canonical type. */
5615 TYPE_CANONICAL (t) = t;
5622 /* Create a variant of type T with alignment ALIGN. */
5625 build_aligned_type (tree type, unsigned int align)
5629 if (TYPE_PACKED (type)
5630 || TYPE_ALIGN (type) == align)
5633 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
5634 if (check_aligned_type (t, type, align))
5637 t = build_variant_type_copy (type);
5638 TYPE_ALIGN (t) = align;
5643 /* Create a new distinct copy of TYPE. The new type is made its own
5644 MAIN_VARIANT. If TYPE requires structural equality checks, the
5645 resulting type requires structural equality checks; otherwise, its
5646 TYPE_CANONICAL points to itself. */
5649 build_distinct_type_copy (tree type)
5651 tree t = copy_node (type);
5653 TYPE_POINTER_TO (t) = 0;
5654 TYPE_REFERENCE_TO (t) = 0;
5656 /* Set the canonical type either to a new equivalence class, or
5657 propagate the need for structural equality checks. */
5658 if (TYPE_STRUCTURAL_EQUALITY_P (type))
5659 SET_TYPE_STRUCTURAL_EQUALITY (t);
5661 TYPE_CANONICAL (t) = t;
5663 /* Make it its own variant. */
5664 TYPE_MAIN_VARIANT (t) = t;
5665 TYPE_NEXT_VARIANT (t) = 0;
5667 /* Note that it is now possible for TYPE_MIN_VALUE to be a value
5668 whose TREE_TYPE is not t. This can also happen in the Ada
5669 frontend when using subtypes. */
5674 /* Create a new variant of TYPE, equivalent but distinct. This is so
5675 the caller can modify it. TYPE_CANONICAL for the return type will
5676 be equivalent to TYPE_CANONICAL of TYPE, indicating that the types
5677 are considered equal by the language itself (or that both types
5678 require structural equality checks). */
5681 build_variant_type_copy (tree type)
5683 tree t, m = TYPE_MAIN_VARIANT (type);
5685 t = build_distinct_type_copy (type);
5687 /* Since we're building a variant, assume that it is a non-semantic
5688 variant. This also propagates TYPE_STRUCTURAL_EQUALITY_P. */
5689 TYPE_CANONICAL (t) = TYPE_CANONICAL (type);
5691 /* Add the new type to the chain of variants of TYPE. */
5692 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (m);
5693 TYPE_NEXT_VARIANT (m) = t;
5694 TYPE_MAIN_VARIANT (t) = m;
5699 /* Return true if the from tree in both tree maps are equal. */
5702 tree_map_base_eq (const void *va, const void *vb)
5704 const struct tree_map_base *const a = (const struct tree_map_base *) va,
5705 *const b = (const struct tree_map_base *) vb;
5706 return (a->from == b->from);
5709 /* Hash a from tree in a tree_base_map. */
5712 tree_map_base_hash (const void *item)
5714 return htab_hash_pointer (((const struct tree_map_base *)item)->from);
5717 /* Return true if this tree map structure is marked for garbage collection
5718 purposes. We simply return true if the from tree is marked, so that this
5719 structure goes away when the from tree goes away. */
5722 tree_map_base_marked_p (const void *p)
5724 return ggc_marked_p (((const struct tree_map_base *) p)->from);
5727 /* Hash a from tree in a tree_map. */
5730 tree_map_hash (const void *item)
5732 return (((const struct tree_map *) item)->hash);
5735 /* Hash a from tree in a tree_decl_map. */
5738 tree_decl_map_hash (const void *item)
5740 return DECL_UID (((const struct tree_decl_map *) item)->base.from);
5743 /* Return the initialization priority for DECL. */
5746 decl_init_priority_lookup (tree decl)
5748 struct tree_priority_map *h;
5749 struct tree_map_base in;
5751 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
5753 h = (struct tree_priority_map *) htab_find (init_priority_for_decl, &in);
5754 return h ? h->init : DEFAULT_INIT_PRIORITY;
5757 /* Return the finalization priority for DECL. */
5760 decl_fini_priority_lookup (tree decl)
5762 struct tree_priority_map *h;
5763 struct tree_map_base in;
5765 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
5767 h = (struct tree_priority_map *) htab_find (init_priority_for_decl, &in);
5768 return h ? h->fini : DEFAULT_INIT_PRIORITY;
5771 /* Return the initialization and finalization priority information for
5772 DECL. If there is no previous priority information, a freshly
5773 allocated structure is returned. */
5775 static struct tree_priority_map *
5776 decl_priority_info (tree decl)
5778 struct tree_priority_map in;
5779 struct tree_priority_map *h;
5782 in.base.from = decl;
5783 loc = htab_find_slot (init_priority_for_decl, &in, INSERT);
5784 h = (struct tree_priority_map *) *loc;
5787 h = ggc_alloc_cleared_tree_priority_map ();
5789 h->base.from = decl;
5790 h->init = DEFAULT_INIT_PRIORITY;
5791 h->fini = DEFAULT_INIT_PRIORITY;
5797 /* Set the initialization priority for DECL to PRIORITY. */
5800 decl_init_priority_insert (tree decl, priority_type priority)
5802 struct tree_priority_map *h;
5804 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
5805 h = decl_priority_info (decl);
5809 /* Set the finalization priority for DECL to PRIORITY. */
5812 decl_fini_priority_insert (tree decl, priority_type priority)
5814 struct tree_priority_map *h;
5816 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
5817 h = decl_priority_info (decl);
5821 /* Print out the statistics for the DECL_DEBUG_EXPR hash table. */
5824 print_debug_expr_statistics (void)
5826 fprintf (stderr, "DECL_DEBUG_EXPR hash: size %ld, %ld elements, %f collisions\n",
5827 (long) htab_size (debug_expr_for_decl),
5828 (long) htab_elements (debug_expr_for_decl),
5829 htab_collisions (debug_expr_for_decl));
5832 /* Print out the statistics for the DECL_VALUE_EXPR hash table. */
5835 print_value_expr_statistics (void)
5837 fprintf (stderr, "DECL_VALUE_EXPR hash: size %ld, %ld elements, %f collisions\n",
5838 (long) htab_size (value_expr_for_decl),
5839 (long) htab_elements (value_expr_for_decl),
5840 htab_collisions (value_expr_for_decl));
5843 /* Lookup a debug expression for FROM, and return it if we find one. */
5846 decl_debug_expr_lookup (tree from)
5848 struct tree_decl_map *h, in;
5849 in.base.from = from;
5851 h = (struct tree_decl_map *)
5852 htab_find_with_hash (debug_expr_for_decl, &in, DECL_UID (from));
5858 /* Insert a mapping FROM->TO in the debug expression hashtable. */
5861 decl_debug_expr_insert (tree from, tree to)
5863 struct tree_decl_map *h;
5866 h = ggc_alloc_tree_decl_map ();
5867 h->base.from = from;
5869 loc = htab_find_slot_with_hash (debug_expr_for_decl, h, DECL_UID (from),
5871 *(struct tree_decl_map **) loc = h;
5874 /* Lookup a value expression for FROM, and return it if we find one. */
5877 decl_value_expr_lookup (tree from)
5879 struct tree_decl_map *h, in;
5880 in.base.from = from;
5882 h = (struct tree_decl_map *)
5883 htab_find_with_hash (value_expr_for_decl, &in, DECL_UID (from));
5889 /* Insert a mapping FROM->TO in the value expression hashtable. */
5892 decl_value_expr_insert (tree from, tree to)
5894 struct tree_decl_map *h;
5897 h = ggc_alloc_tree_decl_map ();
5898 h->base.from = from;
5900 loc = htab_find_slot_with_hash (value_expr_for_decl, h, DECL_UID (from),
5902 *(struct tree_decl_map **) loc = h;
5905 /* Hashing of types so that we don't make duplicates.
5906 The entry point is `type_hash_canon'. */
5908 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
5909 with types in the TREE_VALUE slots), by adding the hash codes
5910 of the individual types. */
5913 type_hash_list (const_tree list, hashval_t hashcode)
5917 for (tail = list; tail; tail = TREE_CHAIN (tail))
5918 if (TREE_VALUE (tail) != error_mark_node)
5919 hashcode = iterative_hash_object (TYPE_HASH (TREE_VALUE (tail)),
5925 /* These are the Hashtable callback functions. */
5927 /* Returns true iff the types are equivalent. */
5930 type_hash_eq (const void *va, const void *vb)
5932 const struct type_hash *const a = (const struct type_hash *) va,
5933 *const b = (const struct type_hash *) vb;
5935 /* First test the things that are the same for all types. */
5936 if (a->hash != b->hash
5937 || TREE_CODE (a->type) != TREE_CODE (b->type)
5938 || TREE_TYPE (a->type) != TREE_TYPE (b->type)
5939 || !attribute_list_equal (TYPE_ATTRIBUTES (a->type),
5940 TYPE_ATTRIBUTES (b->type))
5941 || TYPE_ALIGN (a->type) != TYPE_ALIGN (b->type)
5942 || TYPE_MODE (a->type) != TYPE_MODE (b->type)
5943 || (TREE_CODE (a->type) != COMPLEX_TYPE
5944 && TYPE_NAME (a->type) != TYPE_NAME (b->type)))
5947 switch (TREE_CODE (a->type))
5952 case REFERENCE_TYPE:
5956 return TYPE_VECTOR_SUBPARTS (a->type) == TYPE_VECTOR_SUBPARTS (b->type);
5959 if (TYPE_VALUES (a->type) != TYPE_VALUES (b->type)
5960 && !(TYPE_VALUES (a->type)
5961 && TREE_CODE (TYPE_VALUES (a->type)) == TREE_LIST
5962 && TYPE_VALUES (b->type)
5963 && TREE_CODE (TYPE_VALUES (b->type)) == TREE_LIST
5964 && type_list_equal (TYPE_VALUES (a->type),
5965 TYPE_VALUES (b->type))))
5968 /* ... fall through ... */
5973 return ((TYPE_MAX_VALUE (a->type) == TYPE_MAX_VALUE (b->type)
5974 || tree_int_cst_equal (TYPE_MAX_VALUE (a->type),
5975 TYPE_MAX_VALUE (b->type)))
5976 && (TYPE_MIN_VALUE (a->type) == TYPE_MIN_VALUE (b->type)
5977 || tree_int_cst_equal (TYPE_MIN_VALUE (a->type),
5978 TYPE_MIN_VALUE (b->type))));
5980 case FIXED_POINT_TYPE:
5981 return TYPE_SATURATING (a->type) == TYPE_SATURATING (b->type);
5984 return TYPE_OFFSET_BASETYPE (a->type) == TYPE_OFFSET_BASETYPE (b->type);
5987 return (TYPE_METHOD_BASETYPE (a->type) == TYPE_METHOD_BASETYPE (b->type)
5988 && (TYPE_ARG_TYPES (a->type) == TYPE_ARG_TYPES (b->type)
5989 || (TYPE_ARG_TYPES (a->type)
5990 && TREE_CODE (TYPE_ARG_TYPES (a->type)) == TREE_LIST
5991 && TYPE_ARG_TYPES (b->type)
5992 && TREE_CODE (TYPE_ARG_TYPES (b->type)) == TREE_LIST
5993 && type_list_equal (TYPE_ARG_TYPES (a->type),
5994 TYPE_ARG_TYPES (b->type)))));
5997 return TYPE_DOMAIN (a->type) == TYPE_DOMAIN (b->type);
6001 case QUAL_UNION_TYPE:
6002 return (TYPE_FIELDS (a->type) == TYPE_FIELDS (b->type)
6003 || (TYPE_FIELDS (a->type)
6004 && TREE_CODE (TYPE_FIELDS (a->type)) == TREE_LIST
6005 && TYPE_FIELDS (b->type)
6006 && TREE_CODE (TYPE_FIELDS (b->type)) == TREE_LIST
6007 && type_list_equal (TYPE_FIELDS (a->type),
6008 TYPE_FIELDS (b->type))));
6011 if (TYPE_ARG_TYPES (a->type) == TYPE_ARG_TYPES (b->type)
6012 || (TYPE_ARG_TYPES (a->type)
6013 && TREE_CODE (TYPE_ARG_TYPES (a->type)) == TREE_LIST
6014 && TYPE_ARG_TYPES (b->type)
6015 && TREE_CODE (TYPE_ARG_TYPES (b->type)) == TREE_LIST
6016 && type_list_equal (TYPE_ARG_TYPES (a->type),
6017 TYPE_ARG_TYPES (b->type))))
6025 if (lang_hooks.types.type_hash_eq != NULL)
6026 return lang_hooks.types.type_hash_eq (a->type, b->type);
6031 /* Return the cached hash value. */
6034 type_hash_hash (const void *item)
6036 return ((const struct type_hash *) item)->hash;
6039 /* Look in the type hash table for a type isomorphic to TYPE.
6040 If one is found, return it. Otherwise return 0. */
6043 type_hash_lookup (hashval_t hashcode, tree type)
6045 struct type_hash *h, in;
6047 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
6048 must call that routine before comparing TYPE_ALIGNs. */
6054 h = (struct type_hash *) htab_find_with_hash (type_hash_table, &in,
6061 /* Add an entry to the type-hash-table
6062 for a type TYPE whose hash code is HASHCODE. */
6065 type_hash_add (hashval_t hashcode, tree type)
6067 struct type_hash *h;
6070 h = ggc_alloc_type_hash ();
6073 loc = htab_find_slot_with_hash (type_hash_table, h, hashcode, INSERT);
6077 /* Given TYPE, and HASHCODE its hash code, return the canonical
6078 object for an identical type if one already exists.
6079 Otherwise, return TYPE, and record it as the canonical object.
6081 To use this function, first create a type of the sort you want.
6082 Then compute its hash code from the fields of the type that
6083 make it different from other similar types.
6084 Then call this function and use the value. */
6087 type_hash_canon (unsigned int hashcode, tree type)
6091 /* The hash table only contains main variants, so ensure that's what we're
6093 gcc_assert (TYPE_MAIN_VARIANT (type) == type);
6095 if (!lang_hooks.types.hash_types)
6098 /* See if the type is in the hash table already. If so, return it.
6099 Otherwise, add the type. */
6100 t1 = type_hash_lookup (hashcode, type);
6103 #ifdef GATHER_STATISTICS
6104 tree_node_counts[(int) t_kind]--;
6105 tree_node_sizes[(int) t_kind] -= sizeof (struct tree_type);
6111 type_hash_add (hashcode, type);
6116 /* See if the data pointed to by the type hash table is marked. We consider
6117 it marked if the type is marked or if a debug type number or symbol
6118 table entry has been made for the type. */
6121 type_hash_marked_p (const void *p)
6123 const_tree const type = ((const struct type_hash *) p)->type;
6125 return ggc_marked_p (type);
6129 print_type_hash_statistics (void)
6131 fprintf (stderr, "Type hash: size %ld, %ld elements, %f collisions\n",
6132 (long) htab_size (type_hash_table),
6133 (long) htab_elements (type_hash_table),
6134 htab_collisions (type_hash_table));
6137 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
6138 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
6139 by adding the hash codes of the individual attributes. */
6142 attribute_hash_list (const_tree list, hashval_t hashcode)
6146 for (tail = list; tail; tail = TREE_CHAIN (tail))
6147 /* ??? Do we want to add in TREE_VALUE too? */
6148 hashcode = iterative_hash_object
6149 (IDENTIFIER_HASH_VALUE (TREE_PURPOSE (tail)), hashcode);
6153 /* Given two lists of attributes, return true if list l2 is
6154 equivalent to l1. */
6157 attribute_list_equal (const_tree l1, const_tree l2)
6159 return attribute_list_contained (l1, l2)
6160 && attribute_list_contained (l2, l1);
6163 /* Given two lists of attributes, return true if list L2 is
6164 completely contained within L1. */
6165 /* ??? This would be faster if attribute names were stored in a canonicalized
6166 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
6167 must be used to show these elements are equivalent (which they are). */
6168 /* ??? It's not clear that attributes with arguments will always be handled
6172 attribute_list_contained (const_tree l1, const_tree l2)
6176 /* First check the obvious, maybe the lists are identical. */
6180 /* Maybe the lists are similar. */
6181 for (t1 = l1, t2 = l2;
6183 && TREE_PURPOSE (t1) == TREE_PURPOSE (t2)
6184 && TREE_VALUE (t1) == TREE_VALUE (t2);
6185 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2));
6187 /* Maybe the lists are equal. */
6188 if (t1 == 0 && t2 == 0)
6191 for (; t2 != 0; t2 = TREE_CHAIN (t2))
6194 /* This CONST_CAST is okay because lookup_attribute does not
6195 modify its argument and the return value is assigned to a
6197 for (attr = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)),
6198 CONST_CAST_TREE(l1));
6200 attr = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)),
6203 if (TREE_VALUE (t2) != NULL
6204 && TREE_CODE (TREE_VALUE (t2)) == TREE_LIST
6205 && TREE_VALUE (attr) != NULL
6206 && TREE_CODE (TREE_VALUE (attr)) == TREE_LIST)
6208 if (simple_cst_list_equal (TREE_VALUE (t2),
6209 TREE_VALUE (attr)) == 1)
6212 else if (simple_cst_equal (TREE_VALUE (t2), TREE_VALUE (attr)) == 1)
6223 /* Given two lists of types
6224 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
6225 return 1 if the lists contain the same types in the same order.
6226 Also, the TREE_PURPOSEs must match. */
6229 type_list_equal (const_tree l1, const_tree l2)
6233 for (t1 = l1, t2 = l2; t1 && t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
6234 if (TREE_VALUE (t1) != TREE_VALUE (t2)
6235 || (TREE_PURPOSE (t1) != TREE_PURPOSE (t2)
6236 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2))
6237 && (TREE_TYPE (TREE_PURPOSE (t1))
6238 == TREE_TYPE (TREE_PURPOSE (t2))))))
6244 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
6245 given by TYPE. If the argument list accepts variable arguments,
6246 then this function counts only the ordinary arguments. */
6249 type_num_arguments (const_tree type)
6254 for (t = TYPE_ARG_TYPES (type); t; t = TREE_CHAIN (t))
6255 /* If the function does not take a variable number of arguments,
6256 the last element in the list will have type `void'. */
6257 if (VOID_TYPE_P (TREE_VALUE (t)))
6265 /* Nonzero if integer constants T1 and T2
6266 represent the same constant value. */
6269 tree_int_cst_equal (const_tree t1, const_tree t2)
6274 if (t1 == 0 || t2 == 0)
6277 if (TREE_CODE (t1) == INTEGER_CST
6278 && TREE_CODE (t2) == INTEGER_CST
6279 && TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
6280 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2))
6286 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
6287 The precise way of comparison depends on their data type. */
6290 tree_int_cst_lt (const_tree t1, const_tree t2)
6295 if (TYPE_UNSIGNED (TREE_TYPE (t1)) != TYPE_UNSIGNED (TREE_TYPE (t2)))
6297 int t1_sgn = tree_int_cst_sgn (t1);
6298 int t2_sgn = tree_int_cst_sgn (t2);
6300 if (t1_sgn < t2_sgn)
6302 else if (t1_sgn > t2_sgn)
6304 /* Otherwise, both are non-negative, so we compare them as
6305 unsigned just in case one of them would overflow a signed
6308 else if (!TYPE_UNSIGNED (TREE_TYPE (t1)))
6309 return INT_CST_LT (t1, t2);
6311 return INT_CST_LT_UNSIGNED (t1, t2);
6314 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
6317 tree_int_cst_compare (const_tree t1, const_tree t2)
6319 if (tree_int_cst_lt (t1, t2))
6321 else if (tree_int_cst_lt (t2, t1))
6327 /* Return 1 if T is an INTEGER_CST that can be manipulated efficiently on
6328 the host. If POS is zero, the value can be represented in a single
6329 HOST_WIDE_INT. If POS is nonzero, the value must be non-negative and can
6330 be represented in a single unsigned HOST_WIDE_INT. */
6333 host_integerp (const_tree t, int pos)
6338 return (TREE_CODE (t) == INTEGER_CST
6339 && ((TREE_INT_CST_HIGH (t) == 0
6340 && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) >= 0)
6341 || (! pos && TREE_INT_CST_HIGH (t) == -1
6342 && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0
6343 && (!TYPE_UNSIGNED (TREE_TYPE (t))
6344 || (TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE
6345 && TYPE_IS_SIZETYPE (TREE_TYPE (t)))))
6346 || (pos && TREE_INT_CST_HIGH (t) == 0)));
6349 /* Return the HOST_WIDE_INT least significant bits of T if it is an
6350 INTEGER_CST and there is no overflow. POS is nonzero if the result must
6351 be non-negative. We must be able to satisfy the above conditions. */
6354 tree_low_cst (const_tree t, int pos)
6356 gcc_assert (host_integerp (t, pos));
6357 return TREE_INT_CST_LOW (t);
6360 /* Return the most significant bit of the integer constant T. */
6363 tree_int_cst_msb (const_tree t)
6367 unsigned HOST_WIDE_INT l;
6369 /* Note that using TYPE_PRECISION here is wrong. We care about the
6370 actual bits, not the (arbitrary) range of the type. */
6371 prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t))) - 1;
6372 rshift_double (TREE_INT_CST_LOW (t), TREE_INT_CST_HIGH (t), prec,
6373 2 * HOST_BITS_PER_WIDE_INT, &l, &h, 0);
6374 return (l & 1) == 1;
6377 /* Return an indication of the sign of the integer constant T.
6378 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
6379 Note that -1 will never be returned if T's type is unsigned. */
6382 tree_int_cst_sgn (const_tree t)
6384 if (TREE_INT_CST_LOW (t) == 0 && TREE_INT_CST_HIGH (t) == 0)
6386 else if (TYPE_UNSIGNED (TREE_TYPE (t)))
6388 else if (TREE_INT_CST_HIGH (t) < 0)
6394 /* Return the minimum number of bits needed to represent VALUE in a
6395 signed or unsigned type, UNSIGNEDP says which. */
6398 tree_int_cst_min_precision (tree value, bool unsignedp)
6402 /* If the value is negative, compute its negative minus 1. The latter
6403 adjustment is because the absolute value of the largest negative value
6404 is one larger than the largest positive value. This is equivalent to
6405 a bit-wise negation, so use that operation instead. */
6407 if (tree_int_cst_sgn (value) < 0)
6408 value = fold_build1 (BIT_NOT_EXPR, TREE_TYPE (value), value);
6410 /* Return the number of bits needed, taking into account the fact
6411 that we need one more bit for a signed than unsigned type. */
6413 if (integer_zerop (value))
6416 log = tree_floor_log2 (value);
6418 return log + 1 + !unsignedp;
6421 /* Compare two constructor-element-type constants. Return 1 if the lists
6422 are known to be equal; otherwise return 0. */
6425 simple_cst_list_equal (const_tree l1, const_tree l2)
6427 while (l1 != NULL_TREE && l2 != NULL_TREE)
6429 if (simple_cst_equal (TREE_VALUE (l1), TREE_VALUE (l2)) != 1)
6432 l1 = TREE_CHAIN (l1);
6433 l2 = TREE_CHAIN (l2);
6439 /* Return truthvalue of whether T1 is the same tree structure as T2.
6440 Return 1 if they are the same.
6441 Return 0 if they are understandably different.
6442 Return -1 if either contains tree structure not understood by
6446 simple_cst_equal (const_tree t1, const_tree t2)
6448 enum tree_code code1, code2;
6454 if (t1 == 0 || t2 == 0)
6457 code1 = TREE_CODE (t1);
6458 code2 = TREE_CODE (t2);
6460 if (CONVERT_EXPR_CODE_P (code1) || code1 == NON_LVALUE_EXPR)
6462 if (CONVERT_EXPR_CODE_P (code2)
6463 || code2 == NON_LVALUE_EXPR)
6464 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
6466 return simple_cst_equal (TREE_OPERAND (t1, 0), t2);
6469 else if (CONVERT_EXPR_CODE_P (code2)
6470 || code2 == NON_LVALUE_EXPR)
6471 return simple_cst_equal (t1, TREE_OPERAND (t2, 0));
6479 return (TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
6480 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2));
6483 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
6486 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));
6489 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
6490 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
6491 TREE_STRING_LENGTH (t1)));
6495 unsigned HOST_WIDE_INT idx;
6496 VEC(constructor_elt, gc) *v1 = CONSTRUCTOR_ELTS (t1);
6497 VEC(constructor_elt, gc) *v2 = CONSTRUCTOR_ELTS (t2);
6499 if (VEC_length (constructor_elt, v1) != VEC_length (constructor_elt, v2))
6502 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
6503 /* ??? Should we handle also fields here? */
6504 if (!simple_cst_equal (VEC_index (constructor_elt, v1, idx)->value,
6505 VEC_index (constructor_elt, v2, idx)->value))
6511 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
6514 cmp = simple_cst_equal (CALL_EXPR_FN (t1), CALL_EXPR_FN (t2));
6517 if (call_expr_nargs (t1) != call_expr_nargs (t2))
6520 const_tree arg1, arg2;
6521 const_call_expr_arg_iterator iter1, iter2;
6522 for (arg1 = first_const_call_expr_arg (t1, &iter1),
6523 arg2 = first_const_call_expr_arg (t2, &iter2);
6525 arg1 = next_const_call_expr_arg (&iter1),
6526 arg2 = next_const_call_expr_arg (&iter2))
6528 cmp = simple_cst_equal (arg1, arg2);
6532 return arg1 == arg2;
6536 /* Special case: if either target is an unallocated VAR_DECL,
6537 it means that it's going to be unified with whatever the
6538 TARGET_EXPR is really supposed to initialize, so treat it
6539 as being equivalent to anything. */
6540 if ((TREE_CODE (TREE_OPERAND (t1, 0)) == VAR_DECL
6541 && DECL_NAME (TREE_OPERAND (t1, 0)) == NULL_TREE
6542 && !DECL_RTL_SET_P (TREE_OPERAND (t1, 0)))
6543 || (TREE_CODE (TREE_OPERAND (t2, 0)) == VAR_DECL
6544 && DECL_NAME (TREE_OPERAND (t2, 0)) == NULL_TREE
6545 && !DECL_RTL_SET_P (TREE_OPERAND (t2, 0))))
6548 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
6553 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
6555 case WITH_CLEANUP_EXPR:
6556 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
6560 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t1, 1));
6563 if (TREE_OPERAND (t1, 1) == TREE_OPERAND (t2, 1))
6564 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
6578 /* This general rule works for most tree codes. All exceptions should be
6579 handled above. If this is a language-specific tree code, we can't
6580 trust what might be in the operand, so say we don't know
6582 if ((int) code1 >= (int) LAST_AND_UNUSED_TREE_CODE)
6585 switch (TREE_CODE_CLASS (code1))
6589 case tcc_comparison:
6590 case tcc_expression:
6594 for (i = 0; i < TREE_CODE_LENGTH (code1); i++)
6596 cmp = simple_cst_equal (TREE_OPERAND (t1, i), TREE_OPERAND (t2, i));
6608 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
6609 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
6610 than U, respectively. */
6613 compare_tree_int (const_tree t, unsigned HOST_WIDE_INT u)
6615 if (tree_int_cst_sgn (t) < 0)
6617 else if (TREE_INT_CST_HIGH (t) != 0)
6619 else if (TREE_INT_CST_LOW (t) == u)
6621 else if (TREE_INT_CST_LOW (t) < u)
6627 /* Return true if CODE represents an associative tree code. Otherwise
6630 associative_tree_code (enum tree_code code)
6649 /* Return true if CODE represents a commutative tree code. Otherwise
6652 commutative_tree_code (enum tree_code code)
6665 case UNORDERED_EXPR:
6669 case TRUTH_AND_EXPR:
6670 case TRUTH_XOR_EXPR:
6680 /* Return true if CODE represents a ternary tree code for which the
6681 first two operands are commutative. Otherwise return false. */
6683 commutative_ternary_tree_code (enum tree_code code)
6687 case WIDEN_MULT_PLUS_EXPR:
6688 case WIDEN_MULT_MINUS_EXPR:
6697 /* Generate a hash value for an expression. This can be used iteratively
6698 by passing a previous result as the VAL argument.
6700 This function is intended to produce the same hash for expressions which
6701 would compare equal using operand_equal_p. */
6704 iterative_hash_expr (const_tree t, hashval_t val)
6707 enum tree_code code;
6711 return iterative_hash_hashval_t (0, val);
6713 code = TREE_CODE (t);
6717 /* Alas, constants aren't shared, so we can't rely on pointer
6720 val = iterative_hash_host_wide_int (TREE_INT_CST_LOW (t), val);
6721 return iterative_hash_host_wide_int (TREE_INT_CST_HIGH (t), val);
6724 unsigned int val2 = real_hash (TREE_REAL_CST_PTR (t));
6726 return iterative_hash_hashval_t (val2, val);
6730 unsigned int val2 = fixed_hash (TREE_FIXED_CST_PTR (t));
6732 return iterative_hash_hashval_t (val2, val);
6735 return iterative_hash (TREE_STRING_POINTER (t),
6736 TREE_STRING_LENGTH (t), val);
6738 val = iterative_hash_expr (TREE_REALPART (t), val);
6739 return iterative_hash_expr (TREE_IMAGPART (t), val);
6741 return iterative_hash_expr (TREE_VECTOR_CST_ELTS (t), val);
6743 /* We can just compare by pointer. */
6744 return iterative_hash_host_wide_int (SSA_NAME_VERSION (t), val);
6745 case PLACEHOLDER_EXPR:
6746 /* The node itself doesn't matter. */
6749 /* A list of expressions, for a CALL_EXPR or as the elements of a
6751 for (; t; t = TREE_CHAIN (t))
6752 val = iterative_hash_expr (TREE_VALUE (t), val);
6756 unsigned HOST_WIDE_INT idx;
6758 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (t), idx, field, value)
6760 val = iterative_hash_expr (field, val);
6761 val = iterative_hash_expr (value, val);
6767 /* The type of the second operand is relevant, except for
6768 its top-level qualifiers. */
6769 tree type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (t, 1)));
6771 val = iterative_hash_object (TYPE_HASH (type), val);
6773 /* We could use the standard hash computation from this point
6775 val = iterative_hash_object (code, val);
6776 val = iterative_hash_expr (TREE_OPERAND (t, 1), val);
6777 val = iterative_hash_expr (TREE_OPERAND (t, 0), val);
6781 /* When referring to a built-in FUNCTION_DECL, use the __builtin__ form.
6782 Otherwise nodes that compare equal according to operand_equal_p might
6783 get different hash codes. However, don't do this for machine specific
6784 or front end builtins, since the function code is overloaded in those
6786 if (DECL_BUILT_IN_CLASS (t) == BUILT_IN_NORMAL
6787 && built_in_decls[DECL_FUNCTION_CODE (t)])
6789 t = built_in_decls[DECL_FUNCTION_CODE (t)];
6790 code = TREE_CODE (t);
6794 tclass = TREE_CODE_CLASS (code);
6796 if (tclass == tcc_declaration)
6798 /* DECL's have a unique ID */
6799 val = iterative_hash_host_wide_int (DECL_UID (t), val);
6803 gcc_assert (IS_EXPR_CODE_CLASS (tclass));
6805 val = iterative_hash_object (code, val);
6807 /* Don't hash the type, that can lead to having nodes which
6808 compare equal according to operand_equal_p, but which
6809 have different hash codes. */
6810 if (CONVERT_EXPR_CODE_P (code)
6811 || code == NON_LVALUE_EXPR)
6813 /* Make sure to include signness in the hash computation. */
6814 val += TYPE_UNSIGNED (TREE_TYPE (t));
6815 val = iterative_hash_expr (TREE_OPERAND (t, 0), val);
6818 else if (commutative_tree_code (code))
6820 /* It's a commutative expression. We want to hash it the same
6821 however it appears. We do this by first hashing both operands
6822 and then rehashing based on the order of their independent
6824 hashval_t one = iterative_hash_expr (TREE_OPERAND (t, 0), 0);
6825 hashval_t two = iterative_hash_expr (TREE_OPERAND (t, 1), 0);
6829 t = one, one = two, two = t;
6831 val = iterative_hash_hashval_t (one, val);
6832 val = iterative_hash_hashval_t (two, val);
6835 for (i = TREE_OPERAND_LENGTH (t) - 1; i >= 0; --i)
6836 val = iterative_hash_expr (TREE_OPERAND (t, i), val);
6843 /* Generate a hash value for a pair of expressions. This can be used
6844 iteratively by passing a previous result as the VAL argument.
6846 The same hash value is always returned for a given pair of expressions,
6847 regardless of the order in which they are presented. This is useful in
6848 hashing the operands of commutative functions. */
6851 iterative_hash_exprs_commutative (const_tree t1,
6852 const_tree t2, hashval_t val)
6854 hashval_t one = iterative_hash_expr (t1, 0);
6855 hashval_t two = iterative_hash_expr (t2, 0);
6859 t = one, one = two, two = t;
6860 val = iterative_hash_hashval_t (one, val);
6861 val = iterative_hash_hashval_t (two, val);
6866 /* Constructors for pointer, array and function types.
6867 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
6868 constructed by language-dependent code, not here.) */
6870 /* Construct, lay out and return the type of pointers to TO_TYPE with
6871 mode MODE. If CAN_ALIAS_ALL is TRUE, indicate this type can
6872 reference all of memory. If such a type has already been
6873 constructed, reuse it. */
6876 build_pointer_type_for_mode (tree to_type, enum machine_mode mode,
6881 if (to_type == error_mark_node)
6882 return error_mark_node;
6884 /* If the pointed-to type has the may_alias attribute set, force
6885 a TYPE_REF_CAN_ALIAS_ALL pointer to be generated. */
6886 if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (to_type)))
6887 can_alias_all = true;
6889 /* In some cases, languages will have things that aren't a POINTER_TYPE
6890 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_POINTER_TO.
6891 In that case, return that type without regard to the rest of our
6894 ??? This is a kludge, but consistent with the way this function has
6895 always operated and there doesn't seem to be a good way to avoid this
6897 if (TYPE_POINTER_TO (to_type) != 0
6898 && TREE_CODE (TYPE_POINTER_TO (to_type)) != POINTER_TYPE)
6899 return TYPE_POINTER_TO (to_type);
6901 /* First, if we already have a type for pointers to TO_TYPE and it's
6902 the proper mode, use it. */
6903 for (t = TYPE_POINTER_TO (to_type); t; t = TYPE_NEXT_PTR_TO (t))
6904 if (TYPE_MODE (t) == mode && TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
6907 t = make_node (POINTER_TYPE);
6909 TREE_TYPE (t) = to_type;
6910 SET_TYPE_MODE (t, mode);
6911 TYPE_REF_CAN_ALIAS_ALL (t) = can_alias_all;
6912 TYPE_NEXT_PTR_TO (t) = TYPE_POINTER_TO (to_type);
6913 TYPE_POINTER_TO (to_type) = t;
6915 if (TYPE_STRUCTURAL_EQUALITY_P (to_type))
6916 SET_TYPE_STRUCTURAL_EQUALITY (t);
6917 else if (TYPE_CANONICAL (to_type) != to_type)
6919 = build_pointer_type_for_mode (TYPE_CANONICAL (to_type),
6920 mode, can_alias_all);
6922 /* Lay out the type. This function has many callers that are concerned
6923 with expression-construction, and this simplifies them all. */
6929 /* By default build pointers in ptr_mode. */
6932 build_pointer_type (tree to_type)
6934 addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC
6935 : TYPE_ADDR_SPACE (to_type);
6936 enum machine_mode pointer_mode = targetm.addr_space.pointer_mode (as);
6937 return build_pointer_type_for_mode (to_type, pointer_mode, false);
6940 /* Same as build_pointer_type_for_mode, but for REFERENCE_TYPE. */
6943 build_reference_type_for_mode (tree to_type, enum machine_mode mode,
6948 if (to_type == error_mark_node)
6949 return error_mark_node;
6951 /* If the pointed-to type has the may_alias attribute set, force
6952 a TYPE_REF_CAN_ALIAS_ALL pointer to be generated. */
6953 if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (to_type)))
6954 can_alias_all = true;
6956 /* In some cases, languages will have things that aren't a REFERENCE_TYPE
6957 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_REFERENCE_TO.
6958 In that case, return that type without regard to the rest of our
6961 ??? This is a kludge, but consistent with the way this function has
6962 always operated and there doesn't seem to be a good way to avoid this
6964 if (TYPE_REFERENCE_TO (to_type) != 0
6965 && TREE_CODE (TYPE_REFERENCE_TO (to_type)) != REFERENCE_TYPE)
6966 return TYPE_REFERENCE_TO (to_type);
6968 /* First, if we already have a type for pointers to TO_TYPE and it's
6969 the proper mode, use it. */
6970 for (t = TYPE_REFERENCE_TO (to_type); t; t = TYPE_NEXT_REF_TO (t))
6971 if (TYPE_MODE (t) == mode && TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
6974 t = make_node (REFERENCE_TYPE);
6976 TREE_TYPE (t) = to_type;
6977 SET_TYPE_MODE (t, mode);
6978 TYPE_REF_CAN_ALIAS_ALL (t) = can_alias_all;
6979 TYPE_NEXT_REF_TO (t) = TYPE_REFERENCE_TO (to_type);
6980 TYPE_REFERENCE_TO (to_type) = t;
6982 if (TYPE_STRUCTURAL_EQUALITY_P (to_type))
6983 SET_TYPE_STRUCTURAL_EQUALITY (t);
6984 else if (TYPE_CANONICAL (to_type) != to_type)
6986 = build_reference_type_for_mode (TYPE_CANONICAL (to_type),
6987 mode, can_alias_all);
6995 /* Build the node for the type of references-to-TO_TYPE by default
6999 build_reference_type (tree to_type)
7001 addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC
7002 : TYPE_ADDR_SPACE (to_type);
7003 enum machine_mode pointer_mode = targetm.addr_space.pointer_mode (as);
7004 return build_reference_type_for_mode (to_type, pointer_mode, false);
7007 /* Build a type that is compatible with t but has no cv quals anywhere
7010 const char *const *const * -> char ***. */
7013 build_type_no_quals (tree t)
7015 switch (TREE_CODE (t))
7018 return build_pointer_type_for_mode (build_type_no_quals (TREE_TYPE (t)),
7020 TYPE_REF_CAN_ALIAS_ALL (t));
7021 case REFERENCE_TYPE:
7023 build_reference_type_for_mode (build_type_no_quals (TREE_TYPE (t)),
7025 TYPE_REF_CAN_ALIAS_ALL (t));
7027 return TYPE_MAIN_VARIANT (t);
7031 #define MAX_INT_CACHED_PREC \
7032 (HOST_BITS_PER_WIDE_INT > 64 ? HOST_BITS_PER_WIDE_INT : 64)
7033 static GTY(()) tree nonstandard_integer_type_cache[2 * MAX_INT_CACHED_PREC + 2];
7035 /* Builds a signed or unsigned integer type of precision PRECISION.
7036 Used for C bitfields whose precision does not match that of
7037 built-in target types. */
7039 build_nonstandard_integer_type (unsigned HOST_WIDE_INT precision,
7045 unsignedp = MAX_INT_CACHED_PREC + 1;
7047 if (precision <= MAX_INT_CACHED_PREC)
7049 itype = nonstandard_integer_type_cache[precision + unsignedp];
7054 itype = make_node (INTEGER_TYPE);
7055 TYPE_PRECISION (itype) = precision;
7058 fixup_unsigned_type (itype);
7060 fixup_signed_type (itype);
7063 if (host_integerp (TYPE_MAX_VALUE (itype), 1))
7064 ret = type_hash_canon (tree_low_cst (TYPE_MAX_VALUE (itype), 1), itype);
7065 if (precision <= MAX_INT_CACHED_PREC && lang_hooks.types.hash_types)
7066 nonstandard_integer_type_cache[precision + unsignedp] = ret;
7071 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
7072 ENUMERAL_TYPE or BOOLEAN_TYPE), with low bound LOWVAL and
7073 high bound HIGHVAL. */
7076 build_range_type (tree type, tree lowval, tree highval)
7078 tree itype = make_node (INTEGER_TYPE);
7081 TREE_TYPE (itype) = type;
7083 TYPE_MIN_VALUE (itype) = fold_convert (type, lowval);
7084 TYPE_MAX_VALUE (itype) = highval ? fold_convert (type, highval) : NULL;
7086 TYPE_PRECISION (itype) = TYPE_PRECISION (type);
7087 SET_TYPE_MODE (itype, TYPE_MODE (type));
7088 TYPE_SIZE (itype) = TYPE_SIZE (type);
7089 TYPE_SIZE_UNIT (itype) = TYPE_SIZE_UNIT (type);
7090 TYPE_ALIGN (itype) = TYPE_ALIGN (type);
7091 TYPE_USER_ALIGN (itype) = TYPE_USER_ALIGN (type);
7093 if ((TYPE_MIN_VALUE (itype)
7094 && TREE_CODE (TYPE_MIN_VALUE (itype)) != INTEGER_CST)
7095 || (TYPE_MAX_VALUE (itype)
7096 && TREE_CODE (TYPE_MAX_VALUE (itype)) != INTEGER_CST))
7098 /* Since we cannot reliably merge this type, we need to compare it using
7099 structural equality checks. */
7100 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7103 hash = iterative_hash_expr (TYPE_MIN_VALUE (itype), 0);
7104 hash = iterative_hash_expr (TYPE_MAX_VALUE (itype), hash);
7105 hash = iterative_hash_hashval_t (TYPE_HASH (type), hash);
7106 return type_hash_canon (hash, itype);
7109 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
7110 MAXVAL should be the maximum value in the domain
7111 (one less than the length of the array).
7113 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
7114 We don't enforce this limit, that is up to caller (e.g. language front end).
7115 The limit exists because the result is a signed type and we don't handle
7116 sizes that use more than one HOST_WIDE_INT. */
7119 build_index_type (tree maxval)
7121 return build_range_type (sizetype, size_zero_node, maxval);
7124 /* Return true if the debug information for TYPE, a subtype, should be emitted
7125 as a subrange type. If so, set LOWVAL to the low bound and HIGHVAL to the
7126 high bound, respectively. Sometimes doing so unnecessarily obfuscates the
7127 debug info and doesn't reflect the source code. */
7130 subrange_type_for_debug_p (const_tree type, tree *lowval, tree *highval)
7132 tree base_type = TREE_TYPE (type), low, high;
7134 /* Subrange types have a base type which is an integral type. */
7135 if (!INTEGRAL_TYPE_P (base_type))
7138 /* Get the real bounds of the subtype. */
7139 if (lang_hooks.types.get_subrange_bounds)
7140 lang_hooks.types.get_subrange_bounds (type, &low, &high);
7143 low = TYPE_MIN_VALUE (type);
7144 high = TYPE_MAX_VALUE (type);
7147 /* If the type and its base type have the same representation and the same
7148 name, then the type is not a subrange but a copy of the base type. */
7149 if ((TREE_CODE (base_type) == INTEGER_TYPE
7150 || TREE_CODE (base_type) == BOOLEAN_TYPE)
7151 && int_size_in_bytes (type) == int_size_in_bytes (base_type)
7152 && tree_int_cst_equal (low, TYPE_MIN_VALUE (base_type))
7153 && tree_int_cst_equal (high, TYPE_MAX_VALUE (base_type)))
7155 tree type_name = TYPE_NAME (type);
7156 tree base_type_name = TYPE_NAME (base_type);
7158 if (type_name && TREE_CODE (type_name) == TYPE_DECL)
7159 type_name = DECL_NAME (type_name);
7161 if (base_type_name && TREE_CODE (base_type_name) == TYPE_DECL)
7162 base_type_name = DECL_NAME (base_type_name);
7164 if (type_name == base_type_name)
7175 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
7176 and number of elements specified by the range of values of INDEX_TYPE.
7177 If such a type has already been constructed, reuse it. */
7180 build_array_type (tree elt_type, tree index_type)
7183 hashval_t hashcode = 0;
7185 if (TREE_CODE (elt_type) == FUNCTION_TYPE)
7187 error ("arrays of functions are not meaningful");
7188 elt_type = integer_type_node;
7191 t = make_node (ARRAY_TYPE);
7192 TREE_TYPE (t) = elt_type;
7193 TYPE_DOMAIN (t) = index_type;
7194 TYPE_ADDR_SPACE (t) = TYPE_ADDR_SPACE (elt_type);
7197 /* If the element type is incomplete at this point we get marked for
7198 structural equality. Do not record these types in the canonical
7200 if (TYPE_STRUCTURAL_EQUALITY_P (t))
7203 hashcode = iterative_hash_object (TYPE_HASH (elt_type), hashcode);
7205 hashcode = iterative_hash_object (TYPE_HASH (index_type), hashcode);
7206 t = type_hash_canon (hashcode, t);
7208 if (TYPE_CANONICAL (t) == t)
7210 if (TYPE_STRUCTURAL_EQUALITY_P (elt_type)
7211 || (index_type && TYPE_STRUCTURAL_EQUALITY_P (index_type)))
7212 SET_TYPE_STRUCTURAL_EQUALITY (t);
7213 else if (TYPE_CANONICAL (elt_type) != elt_type
7214 || (index_type && TYPE_CANONICAL (index_type) != index_type))
7216 = build_array_type (TYPE_CANONICAL (elt_type),
7217 index_type ? TYPE_CANONICAL (index_type) : NULL);
7223 /* Recursively examines the array elements of TYPE, until a non-array
7224 element type is found. */
7227 strip_array_types (tree type)
7229 while (TREE_CODE (type) == ARRAY_TYPE)
7230 type = TREE_TYPE (type);
7235 /* Computes the canonical argument types from the argument type list
7238 Upon return, *ANY_STRUCTURAL_P will be true iff either it was true
7239 on entry to this function, or if any of the ARGTYPES are
7242 Upon return, *ANY_NONCANONICAL_P will be true iff either it was
7243 true on entry to this function, or if any of the ARGTYPES are
7246 Returns a canonical argument list, which may be ARGTYPES when the
7247 canonical argument list is unneeded (i.e., *ANY_STRUCTURAL_P is
7248 true) or would not differ from ARGTYPES. */
7251 maybe_canonicalize_argtypes(tree argtypes,
7252 bool *any_structural_p,
7253 bool *any_noncanonical_p)
7256 bool any_noncanonical_argtypes_p = false;
7258 for (arg = argtypes; arg && !(*any_structural_p); arg = TREE_CHAIN (arg))
7260 if (!TREE_VALUE (arg) || TREE_VALUE (arg) == error_mark_node)
7261 /* Fail gracefully by stating that the type is structural. */
7262 *any_structural_p = true;
7263 else if (TYPE_STRUCTURAL_EQUALITY_P (TREE_VALUE (arg)))
7264 *any_structural_p = true;
7265 else if (TYPE_CANONICAL (TREE_VALUE (arg)) != TREE_VALUE (arg)
7266 || TREE_PURPOSE (arg))
7267 /* If the argument has a default argument, we consider it
7268 non-canonical even though the type itself is canonical.
7269 That way, different variants of function and method types
7270 with default arguments will all point to the variant with
7271 no defaults as their canonical type. */
7272 any_noncanonical_argtypes_p = true;
7275 if (*any_structural_p)
7278 if (any_noncanonical_argtypes_p)
7280 /* Build the canonical list of argument types. */
7281 tree canon_argtypes = NULL_TREE;
7282 bool is_void = false;
7284 for (arg = argtypes; arg; arg = TREE_CHAIN (arg))
7286 if (arg == void_list_node)
7289 canon_argtypes = tree_cons (NULL_TREE,
7290 TYPE_CANONICAL (TREE_VALUE (arg)),
7294 canon_argtypes = nreverse (canon_argtypes);
7296 canon_argtypes = chainon (canon_argtypes, void_list_node);
7298 /* There is a non-canonical type. */
7299 *any_noncanonical_p = true;
7300 return canon_argtypes;
7303 /* The canonical argument types are the same as ARGTYPES. */
7307 /* Construct, lay out and return
7308 the type of functions returning type VALUE_TYPE
7309 given arguments of types ARG_TYPES.
7310 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
7311 are data type nodes for the arguments of the function.
7312 If such a type has already been constructed, reuse it. */
7315 build_function_type (tree value_type, tree arg_types)
7318 hashval_t hashcode = 0;
7319 bool any_structural_p, any_noncanonical_p;
7320 tree canon_argtypes;
7322 if (TREE_CODE (value_type) == FUNCTION_TYPE)
7324 error ("function return type cannot be function");
7325 value_type = integer_type_node;
7328 /* Make a node of the sort we want. */
7329 t = make_node (FUNCTION_TYPE);
7330 TREE_TYPE (t) = value_type;
7331 TYPE_ARG_TYPES (t) = arg_types;
7333 /* If we already have such a type, use the old one. */
7334 hashcode = iterative_hash_object (TYPE_HASH (value_type), hashcode);
7335 hashcode = type_hash_list (arg_types, hashcode);
7336 t = type_hash_canon (hashcode, t);
7338 /* Set up the canonical type. */
7339 any_structural_p = TYPE_STRUCTURAL_EQUALITY_P (value_type);
7340 any_noncanonical_p = TYPE_CANONICAL (value_type) != value_type;
7341 canon_argtypes = maybe_canonicalize_argtypes (arg_types,
7343 &any_noncanonical_p);
7344 if (any_structural_p)
7345 SET_TYPE_STRUCTURAL_EQUALITY (t);
7346 else if (any_noncanonical_p)
7347 TYPE_CANONICAL (t) = build_function_type (TYPE_CANONICAL (value_type),
7350 if (!COMPLETE_TYPE_P (t))
7355 /* Build variant of function type ORIG_TYPE skipping ARGS_TO_SKIP. */
7358 build_function_type_skip_args (tree orig_type, bitmap args_to_skip)
7360 tree new_type = NULL;
7361 tree args, new_args = NULL, t;
7365 for (args = TYPE_ARG_TYPES (orig_type); args && args != void_list_node;
7366 args = TREE_CHAIN (args), i++)
7367 if (!bitmap_bit_p (args_to_skip, i))
7368 new_args = tree_cons (NULL_TREE, TREE_VALUE (args), new_args);
7370 new_reversed = nreverse (new_args);
7374 TREE_CHAIN (new_args) = void_list_node;
7376 new_reversed = void_list_node;
7379 /* Use copy_node to preserve as much as possible from original type
7380 (debug info, attribute lists etc.)
7381 Exception is METHOD_TYPEs must have THIS argument.
7382 When we are asked to remove it, we need to build new FUNCTION_TYPE
7384 if (TREE_CODE (orig_type) != METHOD_TYPE
7385 || !bitmap_bit_p (args_to_skip, 0))
7387 new_type = build_distinct_type_copy (orig_type);
7388 TYPE_ARG_TYPES (new_type) = new_reversed;
7393 = build_distinct_type_copy (build_function_type (TREE_TYPE (orig_type),
7395 TYPE_CONTEXT (new_type) = TYPE_CONTEXT (orig_type);
7398 /* This is a new type, not a copy of an old type. Need to reassociate
7399 variants. We can handle everything except the main variant lazily. */
7400 t = TYPE_MAIN_VARIANT (orig_type);
7403 TYPE_MAIN_VARIANT (new_type) = t;
7404 TYPE_NEXT_VARIANT (new_type) = TYPE_NEXT_VARIANT (t);
7405 TYPE_NEXT_VARIANT (t) = new_type;
7409 TYPE_MAIN_VARIANT (new_type) = new_type;
7410 TYPE_NEXT_VARIANT (new_type) = NULL;
7415 /* Build variant of function type ORIG_TYPE skipping ARGS_TO_SKIP.
7417 Arguments from DECL_ARGUMENTS list can't be removed now, since they are
7418 linked by TREE_CHAIN directly. The caller is responsible for eliminating
7419 them when they are being duplicated (i.e. copy_arguments_for_versioning). */
7422 build_function_decl_skip_args (tree orig_decl, bitmap args_to_skip)
7424 tree new_decl = copy_node (orig_decl);
7427 new_type = TREE_TYPE (orig_decl);
7428 if (prototype_p (new_type))
7429 new_type = build_function_type_skip_args (new_type, args_to_skip);
7430 TREE_TYPE (new_decl) = new_type;
7432 /* For declarations setting DECL_VINDEX (i.e. methods)
7433 we expect first argument to be THIS pointer. */
7434 if (bitmap_bit_p (args_to_skip, 0))
7435 DECL_VINDEX (new_decl) = NULL_TREE;
7437 /* When signature changes, we need to clear builtin info. */
7438 if (DECL_BUILT_IN (new_decl) && !bitmap_empty_p (args_to_skip))
7440 DECL_BUILT_IN_CLASS (new_decl) = NOT_BUILT_IN;
7441 DECL_FUNCTION_CODE (new_decl) = (enum built_in_function) 0;
7446 /* Build a function type. The RETURN_TYPE is the type returned by the
7447 function. If VAARGS is set, no void_type_node is appended to the
7448 the list. ARGP must be always be terminated be a NULL_TREE. */
7451 build_function_type_list_1 (bool vaargs, tree return_type, va_list argp)
7455 t = va_arg (argp, tree);
7456 for (args = NULL_TREE; t != NULL_TREE; t = va_arg (argp, tree))
7457 args = tree_cons (NULL_TREE, t, args);
7462 if (args != NULL_TREE)
7463 args = nreverse (args);
7464 gcc_assert (last != void_list_node);
7466 else if (args == NULL_TREE)
7467 args = void_list_node;
7471 args = nreverse (args);
7472 TREE_CHAIN (last) = void_list_node;
7474 args = build_function_type (return_type, args);
7479 /* Build a function type. The RETURN_TYPE is the type returned by the
7480 function. If additional arguments are provided, they are
7481 additional argument types. The list of argument types must always
7482 be terminated by NULL_TREE. */
7485 build_function_type_list (tree return_type, ...)
7490 va_start (p, return_type);
7491 args = build_function_type_list_1 (false, return_type, p);
7496 /* Build a variable argument function type. The RETURN_TYPE is the
7497 type returned by the function. If additional arguments are provided,
7498 they are additional argument types. The list of argument types must
7499 always be terminated by NULL_TREE. */
7502 build_varargs_function_type_list (tree return_type, ...)
7507 va_start (p, return_type);
7508 args = build_function_type_list_1 (true, return_type, p);
7514 /* Build a METHOD_TYPE for a member of BASETYPE. The RETTYPE (a TYPE)
7515 and ARGTYPES (a TREE_LIST) are the return type and arguments types
7516 for the method. An implicit additional parameter (of type
7517 pointer-to-BASETYPE) is added to the ARGTYPES. */
7520 build_method_type_directly (tree basetype,
7527 bool any_structural_p, any_noncanonical_p;
7528 tree canon_argtypes;
7530 /* Make a node of the sort we want. */
7531 t = make_node (METHOD_TYPE);
7533 TYPE_METHOD_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
7534 TREE_TYPE (t) = rettype;
7535 ptype = build_pointer_type (basetype);
7537 /* The actual arglist for this function includes a "hidden" argument
7538 which is "this". Put it into the list of argument types. */
7539 argtypes = tree_cons (NULL_TREE, ptype, argtypes);
7540 TYPE_ARG_TYPES (t) = argtypes;
7542 /* If we already have such a type, use the old one. */
7543 hashcode = iterative_hash_object (TYPE_HASH (basetype), hashcode);
7544 hashcode = iterative_hash_object (TYPE_HASH (rettype), hashcode);
7545 hashcode = type_hash_list (argtypes, hashcode);
7546 t = type_hash_canon (hashcode, t);
7548 /* Set up the canonical type. */
7550 = (TYPE_STRUCTURAL_EQUALITY_P (basetype)
7551 || TYPE_STRUCTURAL_EQUALITY_P (rettype));
7553 = (TYPE_CANONICAL (basetype) != basetype
7554 || TYPE_CANONICAL (rettype) != rettype);
7555 canon_argtypes = maybe_canonicalize_argtypes (TREE_CHAIN (argtypes),
7557 &any_noncanonical_p);
7558 if (any_structural_p)
7559 SET_TYPE_STRUCTURAL_EQUALITY (t);
7560 else if (any_noncanonical_p)
7562 = build_method_type_directly (TYPE_CANONICAL (basetype),
7563 TYPE_CANONICAL (rettype),
7565 if (!COMPLETE_TYPE_P (t))
7571 /* Construct, lay out and return the type of methods belonging to class
7572 BASETYPE and whose arguments and values are described by TYPE.
7573 If that type exists already, reuse it.
7574 TYPE must be a FUNCTION_TYPE node. */
7577 build_method_type (tree basetype, tree type)
7579 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
7581 return build_method_type_directly (basetype,
7583 TYPE_ARG_TYPES (type));
7586 /* Construct, lay out and return the type of offsets to a value
7587 of type TYPE, within an object of type BASETYPE.
7588 If a suitable offset type exists already, reuse it. */
7591 build_offset_type (tree basetype, tree type)
7594 hashval_t hashcode = 0;
7596 /* Make a node of the sort we want. */
7597 t = make_node (OFFSET_TYPE);
7599 TYPE_OFFSET_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
7600 TREE_TYPE (t) = type;
7602 /* If we already have such a type, use the old one. */
7603 hashcode = iterative_hash_object (TYPE_HASH (basetype), hashcode);
7604 hashcode = iterative_hash_object (TYPE_HASH (type), hashcode);
7605 t = type_hash_canon (hashcode, t);
7607 if (!COMPLETE_TYPE_P (t))
7610 if (TYPE_CANONICAL (t) == t)
7612 if (TYPE_STRUCTURAL_EQUALITY_P (basetype)
7613 || TYPE_STRUCTURAL_EQUALITY_P (type))
7614 SET_TYPE_STRUCTURAL_EQUALITY (t);
7615 else if (TYPE_CANONICAL (TYPE_MAIN_VARIANT (basetype)) != basetype
7616 || TYPE_CANONICAL (type) != type)
7618 = build_offset_type (TYPE_CANONICAL (TYPE_MAIN_VARIANT (basetype)),
7619 TYPE_CANONICAL (type));
7625 /* Create a complex type whose components are COMPONENT_TYPE. */
7628 build_complex_type (tree component_type)
7633 gcc_assert (INTEGRAL_TYPE_P (component_type)
7634 || SCALAR_FLOAT_TYPE_P (component_type)
7635 || FIXED_POINT_TYPE_P (component_type));
7637 /* Make a node of the sort we want. */
7638 t = make_node (COMPLEX_TYPE);
7640 TREE_TYPE (t) = TYPE_MAIN_VARIANT (component_type);
7642 /* If we already have such a type, use the old one. */
7643 hashcode = iterative_hash_object (TYPE_HASH (component_type), 0);
7644 t = type_hash_canon (hashcode, t);
7646 if (!COMPLETE_TYPE_P (t))
7649 if (TYPE_CANONICAL (t) == t)
7651 if (TYPE_STRUCTURAL_EQUALITY_P (component_type))
7652 SET_TYPE_STRUCTURAL_EQUALITY (t);
7653 else if (TYPE_CANONICAL (component_type) != component_type)
7655 = build_complex_type (TYPE_CANONICAL (component_type));
7658 /* We need to create a name, since complex is a fundamental type. */
7659 if (! TYPE_NAME (t))
7662 if (component_type == char_type_node)
7663 name = "complex char";
7664 else if (component_type == signed_char_type_node)
7665 name = "complex signed char";
7666 else if (component_type == unsigned_char_type_node)
7667 name = "complex unsigned char";
7668 else if (component_type == short_integer_type_node)
7669 name = "complex short int";
7670 else if (component_type == short_unsigned_type_node)
7671 name = "complex short unsigned int";
7672 else if (component_type == integer_type_node)
7673 name = "complex int";
7674 else if (component_type == unsigned_type_node)
7675 name = "complex unsigned int";
7676 else if (component_type == long_integer_type_node)
7677 name = "complex long int";
7678 else if (component_type == long_unsigned_type_node)
7679 name = "complex long unsigned int";
7680 else if (component_type == long_long_integer_type_node)
7681 name = "complex long long int";
7682 else if (component_type == long_long_unsigned_type_node)
7683 name = "complex long long unsigned int";
7688 TYPE_NAME (t) = build_decl (UNKNOWN_LOCATION, TYPE_DECL,
7689 get_identifier (name), t);
7692 return build_qualified_type (t, TYPE_QUALS (component_type));
7695 /* If TYPE is a real or complex floating-point type and the target
7696 does not directly support arithmetic on TYPE then return the wider
7697 type to be used for arithmetic on TYPE. Otherwise, return
7701 excess_precision_type (tree type)
7703 if (flag_excess_precision != EXCESS_PRECISION_FAST)
7705 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
7706 switch (TREE_CODE (type))
7709 switch (flt_eval_method)
7712 if (TYPE_MODE (type) == TYPE_MODE (float_type_node))
7713 return double_type_node;
7716 if (TYPE_MODE (type) == TYPE_MODE (float_type_node)
7717 || TYPE_MODE (type) == TYPE_MODE (double_type_node))
7718 return long_double_type_node;
7725 if (TREE_CODE (TREE_TYPE (type)) != REAL_TYPE)
7727 switch (flt_eval_method)
7730 if (TYPE_MODE (TREE_TYPE (type)) == TYPE_MODE (float_type_node))
7731 return complex_double_type_node;
7734 if (TYPE_MODE (TREE_TYPE (type)) == TYPE_MODE (float_type_node)
7735 || (TYPE_MODE (TREE_TYPE (type))
7736 == TYPE_MODE (double_type_node)))
7737 return complex_long_double_type_node;
7750 /* Return OP, stripped of any conversions to wider types as much as is safe.
7751 Converting the value back to OP's type makes a value equivalent to OP.
7753 If FOR_TYPE is nonzero, we return a value which, if converted to
7754 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
7756 OP must have integer, real or enumeral type. Pointers are not allowed!
7758 There are some cases where the obvious value we could return
7759 would regenerate to OP if converted to OP's type,
7760 but would not extend like OP to wider types.
7761 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
7762 For example, if OP is (unsigned short)(signed char)-1,
7763 we avoid returning (signed char)-1 if FOR_TYPE is int,
7764 even though extending that to an unsigned short would regenerate OP,
7765 since the result of extending (signed char)-1 to (int)
7766 is different from (int) OP. */
7769 get_unwidened (tree op, tree for_type)
7771 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
7772 tree type = TREE_TYPE (op);
7774 = TYPE_PRECISION (for_type != 0 ? for_type : type);
7776 = (for_type != 0 && for_type != type
7777 && final_prec > TYPE_PRECISION (type)
7778 && TYPE_UNSIGNED (type));
7781 while (CONVERT_EXPR_P (op))
7785 /* TYPE_PRECISION on vector types has different meaning
7786 (TYPE_VECTOR_SUBPARTS) and casts from vectors are view conversions,
7787 so avoid them here. */
7788 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (op, 0))) == VECTOR_TYPE)
7791 bitschange = TYPE_PRECISION (TREE_TYPE (op))
7792 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0)));
7794 /* Truncations are many-one so cannot be removed.
7795 Unless we are later going to truncate down even farther. */
7797 && final_prec > TYPE_PRECISION (TREE_TYPE (op)))
7800 /* See what's inside this conversion. If we decide to strip it,
7802 op = TREE_OPERAND (op, 0);
7804 /* If we have not stripped any zero-extensions (uns is 0),
7805 we can strip any kind of extension.
7806 If we have previously stripped a zero-extension,
7807 only zero-extensions can safely be stripped.
7808 Any extension can be stripped if the bits it would produce
7809 are all going to be discarded later by truncating to FOR_TYPE. */
7813 if (! uns || final_prec <= TYPE_PRECISION (TREE_TYPE (op)))
7815 /* TYPE_UNSIGNED says whether this is a zero-extension.
7816 Let's avoid computing it if it does not affect WIN
7817 and if UNS will not be needed again. */
7819 || CONVERT_EXPR_P (op))
7820 && TYPE_UNSIGNED (TREE_TYPE (op)))
7828 /* If we finally reach a constant see if it fits in for_type and
7829 in that case convert it. */
7831 && TREE_CODE (win) == INTEGER_CST
7832 && TREE_TYPE (win) != for_type
7833 && int_fits_type_p (win, for_type))
7834 win = fold_convert (for_type, win);
7839 /* Return OP or a simpler expression for a narrower value
7840 which can be sign-extended or zero-extended to give back OP.
7841 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
7842 or 0 if the value should be sign-extended. */
7845 get_narrower (tree op, int *unsignedp_ptr)
7850 bool integral_p = INTEGRAL_TYPE_P (TREE_TYPE (op));
7852 while (TREE_CODE (op) == NOP_EXPR)
7855 = (TYPE_PRECISION (TREE_TYPE (op))
7856 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0))));
7858 /* Truncations are many-one so cannot be removed. */
7862 /* See what's inside this conversion. If we decide to strip it,
7867 op = TREE_OPERAND (op, 0);
7868 /* An extension: the outermost one can be stripped,
7869 but remember whether it is zero or sign extension. */
7871 uns = TYPE_UNSIGNED (TREE_TYPE (op));
7872 /* Otherwise, if a sign extension has been stripped,
7873 only sign extensions can now be stripped;
7874 if a zero extension has been stripped, only zero-extensions. */
7875 else if (uns != TYPE_UNSIGNED (TREE_TYPE (op)))
7879 else /* bitschange == 0 */
7881 /* A change in nominal type can always be stripped, but we must
7882 preserve the unsignedness. */
7884 uns = TYPE_UNSIGNED (TREE_TYPE (op));
7886 op = TREE_OPERAND (op, 0);
7887 /* Keep trying to narrow, but don't assign op to win if it
7888 would turn an integral type into something else. */
7889 if (INTEGRAL_TYPE_P (TREE_TYPE (op)) != integral_p)
7896 if (TREE_CODE (op) == COMPONENT_REF
7897 /* Since type_for_size always gives an integer type. */
7898 && TREE_CODE (TREE_TYPE (op)) != REAL_TYPE
7899 && TREE_CODE (TREE_TYPE (op)) != FIXED_POINT_TYPE
7900 /* Ensure field is laid out already. */
7901 && DECL_SIZE (TREE_OPERAND (op, 1)) != 0
7902 && host_integerp (DECL_SIZE (TREE_OPERAND (op, 1)), 1))
7904 unsigned HOST_WIDE_INT innerprec
7905 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op, 1)), 1);
7906 int unsignedp = (DECL_UNSIGNED (TREE_OPERAND (op, 1))
7907 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op, 1))));
7908 tree type = lang_hooks.types.type_for_size (innerprec, unsignedp);
7910 /* We can get this structure field in a narrower type that fits it,
7911 but the resulting extension to its nominal type (a fullword type)
7912 must satisfy the same conditions as for other extensions.
7914 Do this only for fields that are aligned (not bit-fields),
7915 because when bit-field insns will be used there is no
7916 advantage in doing this. */
7918 if (innerprec < TYPE_PRECISION (TREE_TYPE (op))
7919 && ! DECL_BIT_FIELD (TREE_OPERAND (op, 1))
7920 && (first || uns == DECL_UNSIGNED (TREE_OPERAND (op, 1)))
7924 uns = DECL_UNSIGNED (TREE_OPERAND (op, 1));
7925 win = fold_convert (type, op);
7929 *unsignedp_ptr = uns;
7933 /* Returns true if integer constant C has a value that is permissible
7934 for type TYPE (an INTEGER_TYPE). */
7937 int_fits_type_p (const_tree c, const_tree type)
7939 tree type_low_bound, type_high_bound;
7940 bool ok_for_low_bound, ok_for_high_bound, unsc;
7943 dc = tree_to_double_int (c);
7944 unsc = TYPE_UNSIGNED (TREE_TYPE (c));
7946 if (TREE_CODE (TREE_TYPE (c)) == INTEGER_TYPE
7947 && TYPE_IS_SIZETYPE (TREE_TYPE (c))
7949 /* So c is an unsigned integer whose type is sizetype and type is not.
7950 sizetype'd integers are sign extended even though they are
7951 unsigned. If the integer value fits in the lower end word of c,
7952 and if the higher end word has all its bits set to 1, that
7953 means the higher end bits are set to 1 only for sign extension.
7954 So let's convert c into an equivalent zero extended unsigned
7956 dc = double_int_zext (dc, TYPE_PRECISION (TREE_TYPE (c)));
7959 type_low_bound = TYPE_MIN_VALUE (type);
7960 type_high_bound = TYPE_MAX_VALUE (type);
7962 /* If at least one bound of the type is a constant integer, we can check
7963 ourselves and maybe make a decision. If no such decision is possible, but
7964 this type is a subtype, try checking against that. Otherwise, use
7965 double_int_fits_to_tree_p, which checks against the precision.
7967 Compute the status for each possibly constant bound, and return if we see
7968 one does not match. Use ok_for_xxx_bound for this purpose, assigning -1
7969 for "unknown if constant fits", 0 for "constant known *not* to fit" and 1
7970 for "constant known to fit". */
7972 /* Check if c >= type_low_bound. */
7973 if (type_low_bound && TREE_CODE (type_low_bound) == INTEGER_CST)
7975 dd = tree_to_double_int (type_low_bound);
7976 if (TREE_CODE (type) == INTEGER_TYPE
7977 && TYPE_IS_SIZETYPE (type)
7978 && TYPE_UNSIGNED (type))
7979 dd = double_int_zext (dd, TYPE_PRECISION (type));
7980 if (unsc != TYPE_UNSIGNED (TREE_TYPE (type_low_bound)))
7982 int c_neg = (!unsc && double_int_negative_p (dc));
7983 int t_neg = (unsc && double_int_negative_p (dd));
7985 if (c_neg && !t_neg)
7987 if ((c_neg || !t_neg) && double_int_ucmp (dc, dd) < 0)
7990 else if (double_int_cmp (dc, dd, unsc) < 0)
7992 ok_for_low_bound = true;
7995 ok_for_low_bound = false;
7997 /* Check if c <= type_high_bound. */
7998 if (type_high_bound && TREE_CODE (type_high_bound) == INTEGER_CST)
8000 dd = tree_to_double_int (type_high_bound);
8001 if (TREE_CODE (type) == INTEGER_TYPE
8002 && TYPE_IS_SIZETYPE (type)
8003 && TYPE_UNSIGNED (type))
8004 dd = double_int_zext (dd, TYPE_PRECISION (type));
8005 if (unsc != TYPE_UNSIGNED (TREE_TYPE (type_high_bound)))
8007 int c_neg = (!unsc && double_int_negative_p (dc));
8008 int t_neg = (unsc && double_int_negative_p (dd));
8010 if (t_neg && !c_neg)
8012 if ((t_neg || !c_neg) && double_int_ucmp (dc, dd) > 0)
8015 else if (double_int_cmp (dc, dd, unsc) > 0)
8017 ok_for_high_bound = true;
8020 ok_for_high_bound = false;
8022 /* If the constant fits both bounds, the result is known. */
8023 if (ok_for_low_bound && ok_for_high_bound)
8026 /* Perform some generic filtering which may allow making a decision
8027 even if the bounds are not constant. First, negative integers
8028 never fit in unsigned types, */
8029 if (TYPE_UNSIGNED (type) && !unsc && double_int_negative_p (dc))
8032 /* Second, narrower types always fit in wider ones. */
8033 if (TYPE_PRECISION (type) > TYPE_PRECISION (TREE_TYPE (c)))
8036 /* Third, unsigned integers with top bit set never fit signed types. */
8037 if (! TYPE_UNSIGNED (type) && unsc)
8039 int prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (c))) - 1;
8040 if (prec < HOST_BITS_PER_WIDE_INT)
8042 if (((((unsigned HOST_WIDE_INT) 1) << prec) & dc.low) != 0)
8045 else if (((((unsigned HOST_WIDE_INT) 1)
8046 << (prec - HOST_BITS_PER_WIDE_INT)) & dc.high) != 0)
8050 /* If we haven't been able to decide at this point, there nothing more we
8051 can check ourselves here. Look at the base type if we have one and it
8052 has the same precision. */
8053 if (TREE_CODE (type) == INTEGER_TYPE
8054 && TREE_TYPE (type) != 0
8055 && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (type)))
8057 type = TREE_TYPE (type);
8061 /* Or to double_int_fits_to_tree_p, if nothing else. */
8062 return double_int_fits_to_tree_p (type, dc);
8065 /* Stores bounds of an integer TYPE in MIN and MAX. If TYPE has non-constant
8066 bounds or is a POINTER_TYPE, the maximum and/or minimum values that can be
8067 represented (assuming two's-complement arithmetic) within the bit
8068 precision of the type are returned instead. */
8071 get_type_static_bounds (const_tree type, mpz_t min, mpz_t max)
8073 if (!POINTER_TYPE_P (type) && TYPE_MIN_VALUE (type)
8074 && TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST)
8075 mpz_set_double_int (min, tree_to_double_int (TYPE_MIN_VALUE (type)),
8076 TYPE_UNSIGNED (type));
8079 if (TYPE_UNSIGNED (type))
8080 mpz_set_ui (min, 0);
8084 mn = double_int_mask (TYPE_PRECISION (type) - 1);
8085 mn = double_int_sext (double_int_add (mn, double_int_one),
8086 TYPE_PRECISION (type));
8087 mpz_set_double_int (min, mn, false);
8091 if (!POINTER_TYPE_P (type) && TYPE_MAX_VALUE (type)
8092 && TREE_CODE (TYPE_MAX_VALUE (type)) == INTEGER_CST)
8093 mpz_set_double_int (max, tree_to_double_int (TYPE_MAX_VALUE (type)),
8094 TYPE_UNSIGNED (type));
8097 if (TYPE_UNSIGNED (type))
8098 mpz_set_double_int (max, double_int_mask (TYPE_PRECISION (type)),
8101 mpz_set_double_int (max, double_int_mask (TYPE_PRECISION (type) - 1),
8106 /* Return true if VAR is an automatic variable defined in function FN. */
8109 auto_var_in_fn_p (const_tree var, const_tree fn)
8111 return (DECL_P (var) && DECL_CONTEXT (var) == fn
8112 && ((((TREE_CODE (var) == VAR_DECL && ! DECL_EXTERNAL (var))
8113 || TREE_CODE (var) == PARM_DECL)
8114 && ! TREE_STATIC (var))
8115 || TREE_CODE (var) == LABEL_DECL
8116 || TREE_CODE (var) == RESULT_DECL));
8119 /* Subprogram of following function. Called by walk_tree.
8121 Return *TP if it is an automatic variable or parameter of the
8122 function passed in as DATA. */
8125 find_var_from_fn (tree *tp, int *walk_subtrees, void *data)
8127 tree fn = (tree) data;
8132 else if (DECL_P (*tp)
8133 && auto_var_in_fn_p (*tp, fn))
8139 /* Returns true if T is, contains, or refers to a type with variable
8140 size. For METHOD_TYPEs and FUNCTION_TYPEs we exclude the
8141 arguments, but not the return type. If FN is nonzero, only return
8142 true if a modifier of the type or position of FN is a variable or
8143 parameter inside FN.
8145 This concept is more general than that of C99 'variably modified types':
8146 in C99, a struct type is never variably modified because a VLA may not
8147 appear as a structure member. However, in GNU C code like:
8149 struct S { int i[f()]; };
8151 is valid, and other languages may define similar constructs. */
8154 variably_modified_type_p (tree type, tree fn)
8158 /* Test if T is either variable (if FN is zero) or an expression containing
8159 a variable in FN. */
8160 #define RETURN_TRUE_IF_VAR(T) \
8161 do { tree _t = (T); \
8162 if (_t && _t != error_mark_node && TREE_CODE (_t) != INTEGER_CST \
8163 && (!fn || walk_tree (&_t, find_var_from_fn, fn, NULL))) \
8164 return true; } while (0)
8166 if (type == error_mark_node)
8169 /* If TYPE itself has variable size, it is variably modified. */
8170 RETURN_TRUE_IF_VAR (TYPE_SIZE (type));
8171 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT (type));
8173 switch (TREE_CODE (type))
8176 case REFERENCE_TYPE:
8178 if (variably_modified_type_p (TREE_TYPE (type), fn))
8184 /* If TYPE is a function type, it is variably modified if the
8185 return type is variably modified. */
8186 if (variably_modified_type_p (TREE_TYPE (type), fn))
8192 case FIXED_POINT_TYPE:
8195 /* Scalar types are variably modified if their end points
8197 RETURN_TRUE_IF_VAR (TYPE_MIN_VALUE (type));
8198 RETURN_TRUE_IF_VAR (TYPE_MAX_VALUE (type));
8203 case QUAL_UNION_TYPE:
8204 /* We can't see if any of the fields are variably-modified by the
8205 definition we normally use, since that would produce infinite
8206 recursion via pointers. */
8207 /* This is variably modified if some field's type is. */
8208 for (t = TYPE_FIELDS (type); t; t = DECL_CHAIN (t))
8209 if (TREE_CODE (t) == FIELD_DECL)
8211 RETURN_TRUE_IF_VAR (DECL_FIELD_OFFSET (t));
8212 RETURN_TRUE_IF_VAR (DECL_SIZE (t));
8213 RETURN_TRUE_IF_VAR (DECL_SIZE_UNIT (t));
8215 if (TREE_CODE (type) == QUAL_UNION_TYPE)
8216 RETURN_TRUE_IF_VAR (DECL_QUALIFIER (t));
8221 /* Do not call ourselves to avoid infinite recursion. This is
8222 variably modified if the element type is. */
8223 RETURN_TRUE_IF_VAR (TYPE_SIZE (TREE_TYPE (type)));
8224 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT (TREE_TYPE (type)));
8231 /* The current language may have other cases to check, but in general,
8232 all other types are not variably modified. */
8233 return lang_hooks.tree_inlining.var_mod_type_p (type, fn);
8235 #undef RETURN_TRUE_IF_VAR
8238 /* Given a DECL or TYPE, return the scope in which it was declared, or
8239 NULL_TREE if there is no containing scope. */
8242 get_containing_scope (const_tree t)
8244 return (TYPE_P (t) ? TYPE_CONTEXT (t) : DECL_CONTEXT (t));
8247 /* Return the innermost context enclosing DECL that is
8248 a FUNCTION_DECL, or zero if none. */
8251 decl_function_context (const_tree decl)
8255 if (TREE_CODE (decl) == ERROR_MARK)
8258 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
8259 where we look up the function at runtime. Such functions always take
8260 a first argument of type 'pointer to real context'.
8262 C++ should really be fixed to use DECL_CONTEXT for the real context,
8263 and use something else for the "virtual context". */
8264 else if (TREE_CODE (decl) == FUNCTION_DECL && DECL_VINDEX (decl))
8267 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)))));
8269 context = DECL_CONTEXT (decl);
8271 while (context && TREE_CODE (context) != FUNCTION_DECL)
8273 if (TREE_CODE (context) == BLOCK)
8274 context = BLOCK_SUPERCONTEXT (context);
8276 context = get_containing_scope (context);
8282 /* Return the innermost context enclosing DECL that is
8283 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
8284 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
8287 decl_type_context (const_tree decl)
8289 tree context = DECL_CONTEXT (decl);
8292 switch (TREE_CODE (context))
8294 case NAMESPACE_DECL:
8295 case TRANSLATION_UNIT_DECL:
8300 case QUAL_UNION_TYPE:
8305 context = DECL_CONTEXT (context);
8309 context = BLOCK_SUPERCONTEXT (context);
8319 /* CALL is a CALL_EXPR. Return the declaration for the function
8320 called, or NULL_TREE if the called function cannot be
8324 get_callee_fndecl (const_tree call)
8328 if (call == error_mark_node)
8329 return error_mark_node;
8331 /* It's invalid to call this function with anything but a
8333 gcc_assert (TREE_CODE (call) == CALL_EXPR);
8335 /* The first operand to the CALL is the address of the function
8337 addr = CALL_EXPR_FN (call);
8341 /* If this is a readonly function pointer, extract its initial value. */
8342 if (DECL_P (addr) && TREE_CODE (addr) != FUNCTION_DECL
8343 && TREE_READONLY (addr) && ! TREE_THIS_VOLATILE (addr)
8344 && DECL_INITIAL (addr))
8345 addr = DECL_INITIAL (addr);
8347 /* If the address is just `&f' for some function `f', then we know
8348 that `f' is being called. */
8349 if (TREE_CODE (addr) == ADDR_EXPR
8350 && TREE_CODE (TREE_OPERAND (addr, 0)) == FUNCTION_DECL)
8351 return TREE_OPERAND (addr, 0);
8353 /* We couldn't figure out what was being called. */
8357 /* Print debugging information about tree nodes generated during the compile,
8358 and any language-specific information. */
8361 dump_tree_statistics (void)
8363 #ifdef GATHER_STATISTICS
8365 int total_nodes, total_bytes;
8368 fprintf (stderr, "\n??? tree nodes created\n\n");
8369 #ifdef GATHER_STATISTICS
8370 fprintf (stderr, "Kind Nodes Bytes\n");
8371 fprintf (stderr, "---------------------------------------\n");
8372 total_nodes = total_bytes = 0;
8373 for (i = 0; i < (int) all_kinds; i++)
8375 fprintf (stderr, "%-20s %7d %10d\n", tree_node_kind_names[i],
8376 tree_node_counts[i], tree_node_sizes[i]);
8377 total_nodes += tree_node_counts[i];
8378 total_bytes += tree_node_sizes[i];
8380 fprintf (stderr, "---------------------------------------\n");
8381 fprintf (stderr, "%-20s %7d %10d\n", "Total", total_nodes, total_bytes);
8382 fprintf (stderr, "---------------------------------------\n");
8383 ssanames_print_statistics ();
8384 phinodes_print_statistics ();
8386 fprintf (stderr, "(No per-node statistics)\n");
8388 print_type_hash_statistics ();
8389 print_debug_expr_statistics ();
8390 print_value_expr_statistics ();
8391 lang_hooks.print_statistics ();
8394 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
8396 /* Generate a crc32 of a string. */
8399 crc32_string (unsigned chksum, const char *string)
8403 unsigned value = *string << 24;
8406 for (ix = 8; ix--; value <<= 1)
8410 feedback = (value ^ chksum) & 0x80000000 ? 0x04c11db7 : 0;
8419 /* P is a string that will be used in a symbol. Mask out any characters
8420 that are not valid in that context. */
8423 clean_symbol_name (char *p)
8427 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
8430 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
8437 /* Generate a name for a special-purpose function function.
8438 The generated name may need to be unique across the whole link.
8439 TYPE is some string to identify the purpose of this function to the
8440 linker or collect2; it must start with an uppercase letter,
8442 I - for constructors
8444 N - for C++ anonymous namespaces
8445 F - for DWARF unwind frame information. */
8448 get_file_function_name (const char *type)
8454 /* If we already have a name we know to be unique, just use that. */
8455 if (first_global_object_name)
8456 p = q = ASTRDUP (first_global_object_name);
8457 /* If the target is handling the constructors/destructors, they
8458 will be local to this file and the name is only necessary for
8459 debugging purposes. */
8460 else if ((type[0] == 'I' || type[0] == 'D') && targetm.have_ctors_dtors)
8462 const char *file = main_input_filename;
8464 file = input_filename;
8465 /* Just use the file's basename, because the full pathname
8466 might be quite long. */
8467 p = strrchr (file, '/');
8472 p = q = ASTRDUP (p);
8476 /* Otherwise, the name must be unique across the entire link.
8477 We don't have anything that we know to be unique to this translation
8478 unit, so use what we do have and throw in some randomness. */
8480 const char *name = weak_global_object_name;
8481 const char *file = main_input_filename;
8486 file = input_filename;
8488 len = strlen (file);
8489 q = (char *) alloca (9 * 2 + len + 1);
8490 memcpy (q, file, len + 1);
8492 sprintf (q + len, "_%08X_%08X", crc32_string (0, name),
8493 crc32_string (0, get_random_seed (false)));
8498 clean_symbol_name (q);
8499 buf = (char *) alloca (sizeof (FILE_FUNCTION_FORMAT) + strlen (p)
8502 /* Set up the name of the file-level functions we may need.
8503 Use a global object (which is already required to be unique over
8504 the program) rather than the file name (which imposes extra
8506 sprintf (buf, FILE_FUNCTION_FORMAT, type, p);
8508 return get_identifier (buf);
8511 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
8513 /* Complain that the tree code of NODE does not match the expected 0
8514 terminated list of trailing codes. The trailing code list can be
8515 empty, for a more vague error message. FILE, LINE, and FUNCTION
8516 are of the caller. */
8519 tree_check_failed (const_tree node, const char *file,
8520 int line, const char *function, ...)
8524 unsigned length = 0;
8527 va_start (args, function);
8528 while ((code = va_arg (args, int)))
8529 length += 4 + strlen (tree_code_name[code]);
8534 va_start (args, function);
8535 length += strlen ("expected ");
8536 buffer = tmp = (char *) alloca (length);
8538 while ((code = va_arg (args, int)))
8540 const char *prefix = length ? " or " : "expected ";
8542 strcpy (tmp + length, prefix);
8543 length += strlen (prefix);
8544 strcpy (tmp + length, tree_code_name[code]);
8545 length += strlen (tree_code_name[code]);
8550 buffer = "unexpected node";
8552 internal_error ("tree check: %s, have %s in %s, at %s:%d",
8553 buffer, tree_code_name[TREE_CODE (node)],
8554 function, trim_filename (file), line);
8557 /* Complain that the tree code of NODE does match the expected 0
8558 terminated list of trailing codes. FILE, LINE, and FUNCTION are of
8562 tree_not_check_failed (const_tree node, const char *file,
8563 int line, const char *function, ...)
8567 unsigned length = 0;
8570 va_start (args, function);
8571 while ((code = va_arg (args, int)))
8572 length += 4 + strlen (tree_code_name[code]);
8574 va_start (args, function);
8575 buffer = (char *) alloca (length);
8577 while ((code = va_arg (args, int)))
8581 strcpy (buffer + length, " or ");
8584 strcpy (buffer + length, tree_code_name[code]);
8585 length += strlen (tree_code_name[code]);
8589 internal_error ("tree check: expected none of %s, have %s in %s, at %s:%d",
8590 buffer, tree_code_name[TREE_CODE (node)],
8591 function, trim_filename (file), line);
8594 /* Similar to tree_check_failed, except that we check for a class of tree
8595 code, given in CL. */
8598 tree_class_check_failed (const_tree node, const enum tree_code_class cl,
8599 const char *file, int line, const char *function)
8602 ("tree check: expected class %qs, have %qs (%s) in %s, at %s:%d",
8603 TREE_CODE_CLASS_STRING (cl),
8604 TREE_CODE_CLASS_STRING (TREE_CODE_CLASS (TREE_CODE (node))),
8605 tree_code_name[TREE_CODE (node)], function, trim_filename (file), line);
8608 /* Similar to tree_check_failed, except that instead of specifying a
8609 dozen codes, use the knowledge that they're all sequential. */
8612 tree_range_check_failed (const_tree node, const char *file, int line,
8613 const char *function, enum tree_code c1,
8617 unsigned length = 0;
8620 for (c = c1; c <= c2; ++c)
8621 length += 4 + strlen (tree_code_name[c]);
8623 length += strlen ("expected ");
8624 buffer = (char *) alloca (length);
8627 for (c = c1; c <= c2; ++c)
8629 const char *prefix = length ? " or " : "expected ";
8631 strcpy (buffer + length, prefix);
8632 length += strlen (prefix);
8633 strcpy (buffer + length, tree_code_name[c]);
8634 length += strlen (tree_code_name[c]);
8637 internal_error ("tree check: %s, have %s in %s, at %s:%d",
8638 buffer, tree_code_name[TREE_CODE (node)],
8639 function, trim_filename (file), line);
8643 /* Similar to tree_check_failed, except that we check that a tree does
8644 not have the specified code, given in CL. */
8647 tree_not_class_check_failed (const_tree node, const enum tree_code_class cl,
8648 const char *file, int line, const char *function)
8651 ("tree check: did not expect class %qs, have %qs (%s) in %s, at %s:%d",
8652 TREE_CODE_CLASS_STRING (cl),
8653 TREE_CODE_CLASS_STRING (TREE_CODE_CLASS (TREE_CODE (node))),
8654 tree_code_name[TREE_CODE (node)], function, trim_filename (file), line);
8658 /* Similar to tree_check_failed but applied to OMP_CLAUSE codes. */
8661 omp_clause_check_failed (const_tree node, const char *file, int line,
8662 const char *function, enum omp_clause_code code)
8664 internal_error ("tree check: expected omp_clause %s, have %s in %s, at %s:%d",
8665 omp_clause_code_name[code], tree_code_name[TREE_CODE (node)],
8666 function, trim_filename (file), line);
8670 /* Similar to tree_range_check_failed but applied to OMP_CLAUSE codes. */
8673 omp_clause_range_check_failed (const_tree node, const char *file, int line,
8674 const char *function, enum omp_clause_code c1,
8675 enum omp_clause_code c2)
8678 unsigned length = 0;
8681 for (c = c1; c <= c2; ++c)
8682 length += 4 + strlen (omp_clause_code_name[c]);
8684 length += strlen ("expected ");
8685 buffer = (char *) alloca (length);
8688 for (c = c1; c <= c2; ++c)
8690 const char *prefix = length ? " or " : "expected ";
8692 strcpy (buffer + length, prefix);
8693 length += strlen (prefix);
8694 strcpy (buffer + length, omp_clause_code_name[c]);
8695 length += strlen (omp_clause_code_name[c]);
8698 internal_error ("tree check: %s, have %s in %s, at %s:%d",
8699 buffer, omp_clause_code_name[TREE_CODE (node)],
8700 function, trim_filename (file), line);
8704 #undef DEFTREESTRUCT
8705 #define DEFTREESTRUCT(VAL, NAME) NAME,
8707 static const char *ts_enum_names[] = {
8708 #include "treestruct.def"
8710 #undef DEFTREESTRUCT
8712 #define TS_ENUM_NAME(EN) (ts_enum_names[(EN)])
8714 /* Similar to tree_class_check_failed, except that we check for
8715 whether CODE contains the tree structure identified by EN. */
8718 tree_contains_struct_check_failed (const_tree node,
8719 const enum tree_node_structure_enum en,
8720 const char *file, int line,
8721 const char *function)
8724 ("tree check: expected tree that contains %qs structure, have %qs in %s, at %s:%d",
8726 tree_code_name[TREE_CODE (node)], function, trim_filename (file), line);
8730 /* Similar to above, except that the check is for the bounds of a TREE_VEC's
8731 (dynamically sized) vector. */
8734 tree_vec_elt_check_failed (int idx, int len, const char *file, int line,
8735 const char *function)
8738 ("tree check: accessed elt %d of tree_vec with %d elts in %s, at %s:%d",
8739 idx + 1, len, function, trim_filename (file), line);
8742 /* Similar to above, except that the check is for the bounds of the operand
8743 vector of an expression node EXP. */
8746 tree_operand_check_failed (int idx, const_tree exp, const char *file,
8747 int line, const char *function)
8749 int code = TREE_CODE (exp);
8751 ("tree check: accessed operand %d of %s with %d operands in %s, at %s:%d",
8752 idx + 1, tree_code_name[code], TREE_OPERAND_LENGTH (exp),
8753 function, trim_filename (file), line);
8756 /* Similar to above, except that the check is for the number of
8757 operands of an OMP_CLAUSE node. */
8760 omp_clause_operand_check_failed (int idx, const_tree t, const char *file,
8761 int line, const char *function)
8764 ("tree check: accessed operand %d of omp_clause %s with %d operands "
8765 "in %s, at %s:%d", idx + 1, omp_clause_code_name[OMP_CLAUSE_CODE (t)],
8766 omp_clause_num_ops [OMP_CLAUSE_CODE (t)], function,
8767 trim_filename (file), line);
8769 #endif /* ENABLE_TREE_CHECKING */
8771 /* Create a new vector type node holding SUBPARTS units of type INNERTYPE,
8772 and mapped to the machine mode MODE. Initialize its fields and build
8773 the information necessary for debugging output. */
8776 make_vector_type (tree innertype, int nunits, enum machine_mode mode)
8779 hashval_t hashcode = 0;
8781 t = make_node (VECTOR_TYPE);
8782 TREE_TYPE (t) = TYPE_MAIN_VARIANT (innertype);
8783 SET_TYPE_VECTOR_SUBPARTS (t, nunits);
8784 SET_TYPE_MODE (t, mode);
8786 if (TYPE_STRUCTURAL_EQUALITY_P (innertype))
8787 SET_TYPE_STRUCTURAL_EQUALITY (t);
8788 else if (TYPE_CANONICAL (innertype) != innertype
8789 || mode != VOIDmode)
8791 = make_vector_type (TYPE_CANONICAL (innertype), nunits, VOIDmode);
8795 hashcode = iterative_hash_host_wide_int (VECTOR_TYPE, hashcode);
8796 hashcode = iterative_hash_host_wide_int (nunits, hashcode);
8797 hashcode = iterative_hash_host_wide_int (mode, hashcode);
8798 hashcode = iterative_hash_object (TYPE_HASH (TREE_TYPE (t)), hashcode);
8799 t = type_hash_canon (hashcode, t);
8801 /* We have built a main variant, based on the main variant of the
8802 inner type. Use it to build the variant we return. */
8803 if ((TYPE_ATTRIBUTES (innertype) || TYPE_QUALS (innertype))
8804 && TREE_TYPE (t) != innertype)
8805 return build_type_attribute_qual_variant (t,
8806 TYPE_ATTRIBUTES (innertype),
8807 TYPE_QUALS (innertype));
8813 make_or_reuse_type (unsigned size, int unsignedp)
8815 if (size == INT_TYPE_SIZE)
8816 return unsignedp ? unsigned_type_node : integer_type_node;
8817 if (size == CHAR_TYPE_SIZE)
8818 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
8819 if (size == SHORT_TYPE_SIZE)
8820 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
8821 if (size == LONG_TYPE_SIZE)
8822 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
8823 if (size == LONG_LONG_TYPE_SIZE)
8824 return (unsignedp ? long_long_unsigned_type_node
8825 : long_long_integer_type_node);
8826 if (size == 128 && int128_integer_type_node)
8827 return (unsignedp ? int128_unsigned_type_node
8828 : int128_integer_type_node);
8831 return make_unsigned_type (size);
8833 return make_signed_type (size);
8836 /* Create or reuse a fract type by SIZE, UNSIGNEDP, and SATP. */
8839 make_or_reuse_fract_type (unsigned size, int unsignedp, int satp)
8843 if (size == SHORT_FRACT_TYPE_SIZE)
8844 return unsignedp ? sat_unsigned_short_fract_type_node
8845 : sat_short_fract_type_node;
8846 if (size == FRACT_TYPE_SIZE)
8847 return unsignedp ? sat_unsigned_fract_type_node : sat_fract_type_node;
8848 if (size == LONG_FRACT_TYPE_SIZE)
8849 return unsignedp ? sat_unsigned_long_fract_type_node
8850 : sat_long_fract_type_node;
8851 if (size == LONG_LONG_FRACT_TYPE_SIZE)
8852 return unsignedp ? sat_unsigned_long_long_fract_type_node
8853 : sat_long_long_fract_type_node;
8857 if (size == SHORT_FRACT_TYPE_SIZE)
8858 return unsignedp ? unsigned_short_fract_type_node
8859 : short_fract_type_node;
8860 if (size == FRACT_TYPE_SIZE)
8861 return unsignedp ? unsigned_fract_type_node : fract_type_node;
8862 if (size == LONG_FRACT_TYPE_SIZE)
8863 return unsignedp ? unsigned_long_fract_type_node
8864 : long_fract_type_node;
8865 if (size == LONG_LONG_FRACT_TYPE_SIZE)
8866 return unsignedp ? unsigned_long_long_fract_type_node
8867 : long_long_fract_type_node;
8870 return make_fract_type (size, unsignedp, satp);
8873 /* Create or reuse an accum type by SIZE, UNSIGNEDP, and SATP. */
8876 make_or_reuse_accum_type (unsigned size, int unsignedp, int satp)
8880 if (size == SHORT_ACCUM_TYPE_SIZE)
8881 return unsignedp ? sat_unsigned_short_accum_type_node
8882 : sat_short_accum_type_node;
8883 if (size == ACCUM_TYPE_SIZE)
8884 return unsignedp ? sat_unsigned_accum_type_node : sat_accum_type_node;
8885 if (size == LONG_ACCUM_TYPE_SIZE)
8886 return unsignedp ? sat_unsigned_long_accum_type_node
8887 : sat_long_accum_type_node;
8888 if (size == LONG_LONG_ACCUM_TYPE_SIZE)
8889 return unsignedp ? sat_unsigned_long_long_accum_type_node
8890 : sat_long_long_accum_type_node;
8894 if (size == SHORT_ACCUM_TYPE_SIZE)
8895 return unsignedp ? unsigned_short_accum_type_node
8896 : short_accum_type_node;
8897 if (size == ACCUM_TYPE_SIZE)
8898 return unsignedp ? unsigned_accum_type_node : accum_type_node;
8899 if (size == LONG_ACCUM_TYPE_SIZE)
8900 return unsignedp ? unsigned_long_accum_type_node
8901 : long_accum_type_node;
8902 if (size == LONG_LONG_ACCUM_TYPE_SIZE)
8903 return unsignedp ? unsigned_long_long_accum_type_node
8904 : long_long_accum_type_node;
8907 return make_accum_type (size, unsignedp, satp);
8910 /* Create nodes for all integer types (and error_mark_node) using the sizes
8911 of C datatypes. The caller should call set_sizetype soon after calling
8912 this function to select one of the types as sizetype. */
8915 build_common_tree_nodes (bool signed_char)
8917 error_mark_node = make_node (ERROR_MARK);
8918 TREE_TYPE (error_mark_node) = error_mark_node;
8920 initialize_sizetypes ();
8922 /* Define both `signed char' and `unsigned char'. */
8923 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
8924 TYPE_STRING_FLAG (signed_char_type_node) = 1;
8925 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
8926 TYPE_STRING_FLAG (unsigned_char_type_node) = 1;
8928 /* Define `char', which is like either `signed char' or `unsigned char'
8929 but not the same as either. */
8932 ? make_signed_type (CHAR_TYPE_SIZE)
8933 : make_unsigned_type (CHAR_TYPE_SIZE));
8934 TYPE_STRING_FLAG (char_type_node) = 1;
8936 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
8937 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
8938 integer_type_node = make_signed_type (INT_TYPE_SIZE);
8939 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
8940 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
8941 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
8942 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
8943 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
8944 #if HOST_BITS_PER_WIDE_INT >= 64
8945 /* TODO: This isn't correct, but as logic depends at the moment on
8946 host's instead of target's wide-integer.
8947 If there is a target not supporting TImode, but has an 128-bit
8948 integer-scalar register, this target check needs to be adjusted. */
8949 if (targetm.scalar_mode_supported_p (TImode))
8951 int128_integer_type_node = make_signed_type (128);
8952 int128_unsigned_type_node = make_unsigned_type (128);
8955 /* Define a boolean type. This type only represents boolean values but
8956 may be larger than char depending on the value of BOOL_TYPE_SIZE.
8957 Front ends which want to override this size (i.e. Java) can redefine
8958 boolean_type_node before calling build_common_tree_nodes_2. */
8959 boolean_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
8960 TREE_SET_CODE (boolean_type_node, BOOLEAN_TYPE);
8961 TYPE_MAX_VALUE (boolean_type_node) = build_int_cst (boolean_type_node, 1);
8962 TYPE_PRECISION (boolean_type_node) = 1;
8964 /* Fill in the rest of the sized types. Reuse existing type nodes
8966 intQI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (QImode), 0);
8967 intHI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (HImode), 0);
8968 intSI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (SImode), 0);
8969 intDI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (DImode), 0);
8970 intTI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (TImode), 0);
8972 unsigned_intQI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (QImode), 1);
8973 unsigned_intHI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (HImode), 1);
8974 unsigned_intSI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (SImode), 1);
8975 unsigned_intDI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (DImode), 1);
8976 unsigned_intTI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (TImode), 1);
8978 access_public_node = get_identifier ("public");
8979 access_protected_node = get_identifier ("protected");
8980 access_private_node = get_identifier ("private");
8983 /* Call this function after calling build_common_tree_nodes and set_sizetype.
8984 It will create several other common tree nodes. */
8987 build_common_tree_nodes_2 (int short_double)
8989 /* Define these next since types below may used them. */
8990 integer_zero_node = build_int_cst (integer_type_node, 0);
8991 integer_one_node = build_int_cst (integer_type_node, 1);
8992 integer_three_node = build_int_cst (integer_type_node, 3);
8993 integer_minus_one_node = build_int_cst (integer_type_node, -1);
8995 size_zero_node = size_int (0);
8996 size_one_node = size_int (1);
8997 bitsize_zero_node = bitsize_int (0);
8998 bitsize_one_node = bitsize_int (1);
8999 bitsize_unit_node = bitsize_int (BITS_PER_UNIT);
9001 boolean_false_node = TYPE_MIN_VALUE (boolean_type_node);
9002 boolean_true_node = TYPE_MAX_VALUE (boolean_type_node);
9004 void_type_node = make_node (VOID_TYPE);
9005 layout_type (void_type_node);
9007 /* We are not going to have real types in C with less than byte alignment,
9008 so we might as well not have any types that claim to have it. */
9009 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
9010 TYPE_USER_ALIGN (void_type_node) = 0;
9012 null_pointer_node = build_int_cst (build_pointer_type (void_type_node), 0);
9013 layout_type (TREE_TYPE (null_pointer_node));
9015 ptr_type_node = build_pointer_type (void_type_node);
9017 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
9018 fileptr_type_node = ptr_type_node;
9020 float_type_node = make_node (REAL_TYPE);
9021 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
9022 layout_type (float_type_node);
9024 double_type_node = make_node (REAL_TYPE);
9026 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
9028 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
9029 layout_type (double_type_node);
9031 long_double_type_node = make_node (REAL_TYPE);
9032 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
9033 layout_type (long_double_type_node);
9035 float_ptr_type_node = build_pointer_type (float_type_node);
9036 double_ptr_type_node = build_pointer_type (double_type_node);
9037 long_double_ptr_type_node = build_pointer_type (long_double_type_node);
9038 integer_ptr_type_node = build_pointer_type (integer_type_node);
9040 /* Fixed size integer types. */
9041 uint32_type_node = build_nonstandard_integer_type (32, true);
9042 uint64_type_node = build_nonstandard_integer_type (64, true);
9044 /* Decimal float types. */
9045 dfloat32_type_node = make_node (REAL_TYPE);
9046 TYPE_PRECISION (dfloat32_type_node) = DECIMAL32_TYPE_SIZE;
9047 layout_type (dfloat32_type_node);
9048 SET_TYPE_MODE (dfloat32_type_node, SDmode);
9049 dfloat32_ptr_type_node = build_pointer_type (dfloat32_type_node);
9051 dfloat64_type_node = make_node (REAL_TYPE);
9052 TYPE_PRECISION (dfloat64_type_node) = DECIMAL64_TYPE_SIZE;
9053 layout_type (dfloat64_type_node);
9054 SET_TYPE_MODE (dfloat64_type_node, DDmode);
9055 dfloat64_ptr_type_node = build_pointer_type (dfloat64_type_node);
9057 dfloat128_type_node = make_node (REAL_TYPE);
9058 TYPE_PRECISION (dfloat128_type_node) = DECIMAL128_TYPE_SIZE;
9059 layout_type (dfloat128_type_node);
9060 SET_TYPE_MODE (dfloat128_type_node, TDmode);
9061 dfloat128_ptr_type_node = build_pointer_type (dfloat128_type_node);
9063 complex_integer_type_node = build_complex_type (integer_type_node);
9064 complex_float_type_node = build_complex_type (float_type_node);
9065 complex_double_type_node = build_complex_type (double_type_node);
9066 complex_long_double_type_node = build_complex_type (long_double_type_node);
9068 /* Make fixed-point nodes based on sat/non-sat and signed/unsigned. */
9069 #define MAKE_FIXED_TYPE_NODE(KIND,SIZE) \
9070 sat_ ## KIND ## _type_node = \
9071 make_sat_signed_ ## KIND ## _type (SIZE); \
9072 sat_unsigned_ ## KIND ## _type_node = \
9073 make_sat_unsigned_ ## KIND ## _type (SIZE); \
9074 KIND ## _type_node = make_signed_ ## KIND ## _type (SIZE); \
9075 unsigned_ ## KIND ## _type_node = \
9076 make_unsigned_ ## KIND ## _type (SIZE);
9078 #define MAKE_FIXED_TYPE_NODE_WIDTH(KIND,WIDTH,SIZE) \
9079 sat_ ## WIDTH ## KIND ## _type_node = \
9080 make_sat_signed_ ## KIND ## _type (SIZE); \
9081 sat_unsigned_ ## WIDTH ## KIND ## _type_node = \
9082 make_sat_unsigned_ ## KIND ## _type (SIZE); \
9083 WIDTH ## KIND ## _type_node = make_signed_ ## KIND ## _type (SIZE); \
9084 unsigned_ ## WIDTH ## KIND ## _type_node = \
9085 make_unsigned_ ## KIND ## _type (SIZE);
9087 /* Make fixed-point type nodes based on four different widths. */
9088 #define MAKE_FIXED_TYPE_NODE_FAMILY(N1,N2) \
9089 MAKE_FIXED_TYPE_NODE_WIDTH (N1, short_, SHORT_ ## N2 ## _TYPE_SIZE) \
9090 MAKE_FIXED_TYPE_NODE (N1, N2 ## _TYPE_SIZE) \
9091 MAKE_FIXED_TYPE_NODE_WIDTH (N1, long_, LONG_ ## N2 ## _TYPE_SIZE) \
9092 MAKE_FIXED_TYPE_NODE_WIDTH (N1, long_long_, LONG_LONG_ ## N2 ## _TYPE_SIZE)
9094 /* Make fixed-point mode nodes based on sat/non-sat and signed/unsigned. */
9095 #define MAKE_FIXED_MODE_NODE(KIND,NAME,MODE) \
9096 NAME ## _type_node = \
9097 make_or_reuse_signed_ ## KIND ## _type (GET_MODE_BITSIZE (MODE ## mode)); \
9098 u ## NAME ## _type_node = \
9099 make_or_reuse_unsigned_ ## KIND ## _type \
9100 (GET_MODE_BITSIZE (U ## MODE ## mode)); \
9101 sat_ ## NAME ## _type_node = \
9102 make_or_reuse_sat_signed_ ## KIND ## _type \
9103 (GET_MODE_BITSIZE (MODE ## mode)); \
9104 sat_u ## NAME ## _type_node = \
9105 make_or_reuse_sat_unsigned_ ## KIND ## _type \
9106 (GET_MODE_BITSIZE (U ## MODE ## mode));
9108 /* Fixed-point type and mode nodes. */
9109 MAKE_FIXED_TYPE_NODE_FAMILY (fract, FRACT)
9110 MAKE_FIXED_TYPE_NODE_FAMILY (accum, ACCUM)
9111 MAKE_FIXED_MODE_NODE (fract, qq, QQ)
9112 MAKE_FIXED_MODE_NODE (fract, hq, HQ)
9113 MAKE_FIXED_MODE_NODE (fract, sq, SQ)
9114 MAKE_FIXED_MODE_NODE (fract, dq, DQ)
9115 MAKE_FIXED_MODE_NODE (fract, tq, TQ)
9116 MAKE_FIXED_MODE_NODE (accum, ha, HA)
9117 MAKE_FIXED_MODE_NODE (accum, sa, SA)
9118 MAKE_FIXED_MODE_NODE (accum, da, DA)
9119 MAKE_FIXED_MODE_NODE (accum, ta, TA)
9122 tree t = targetm.build_builtin_va_list ();
9124 /* Many back-ends define record types without setting TYPE_NAME.
9125 If we copied the record type here, we'd keep the original
9126 record type without a name. This breaks name mangling. So,
9127 don't copy record types and let c_common_nodes_and_builtins()
9128 declare the type to be __builtin_va_list. */
9129 if (TREE_CODE (t) != RECORD_TYPE)
9130 t = build_variant_type_copy (t);
9132 va_list_type_node = t;
9136 /* A subroutine of build_common_builtin_nodes. Define a builtin function. */
9139 local_define_builtin (const char *name, tree type, enum built_in_function code,
9140 const char *library_name, int ecf_flags)
9144 decl = add_builtin_function (name, type, code, BUILT_IN_NORMAL,
9145 library_name, NULL_TREE);
9146 if (ecf_flags & ECF_CONST)
9147 TREE_READONLY (decl) = 1;
9148 if (ecf_flags & ECF_PURE)
9149 DECL_PURE_P (decl) = 1;
9150 if (ecf_flags & ECF_LOOPING_CONST_OR_PURE)
9151 DECL_LOOPING_CONST_OR_PURE_P (decl) = 1;
9152 if (ecf_flags & ECF_NORETURN)
9153 TREE_THIS_VOLATILE (decl) = 1;
9154 if (ecf_flags & ECF_NOTHROW)
9155 TREE_NOTHROW (decl) = 1;
9156 if (ecf_flags & ECF_MALLOC)
9157 DECL_IS_MALLOC (decl) = 1;
9159 built_in_decls[code] = decl;
9160 implicit_built_in_decls[code] = decl;
9163 /* Call this function after instantiating all builtins that the language
9164 front end cares about. This will build the rest of the builtins that
9165 are relied upon by the tree optimizers and the middle-end. */
9168 build_common_builtin_nodes (void)
9172 if (built_in_decls[BUILT_IN_MEMCPY] == NULL
9173 || built_in_decls[BUILT_IN_MEMMOVE] == NULL)
9175 ftype = build_function_type_list (ptr_type_node,
9176 ptr_type_node, const_ptr_type_node,
9177 size_type_node, NULL_TREE);
9179 if (built_in_decls[BUILT_IN_MEMCPY] == NULL)
9180 local_define_builtin ("__builtin_memcpy", ftype, BUILT_IN_MEMCPY,
9181 "memcpy", ECF_NOTHROW);
9182 if (built_in_decls[BUILT_IN_MEMMOVE] == NULL)
9183 local_define_builtin ("__builtin_memmove", ftype, BUILT_IN_MEMMOVE,
9184 "memmove", ECF_NOTHROW);
9187 if (built_in_decls[BUILT_IN_MEMCMP] == NULL)
9189 ftype = build_function_type_list (integer_type_node, const_ptr_type_node,
9190 const_ptr_type_node, size_type_node,
9192 local_define_builtin ("__builtin_memcmp", ftype, BUILT_IN_MEMCMP,
9193 "memcmp", ECF_PURE | ECF_NOTHROW);
9196 if (built_in_decls[BUILT_IN_MEMSET] == NULL)
9198 ftype = build_function_type_list (ptr_type_node,
9199 ptr_type_node, integer_type_node,
9200 size_type_node, NULL_TREE);
9201 local_define_builtin ("__builtin_memset", ftype, BUILT_IN_MEMSET,
9202 "memset", ECF_NOTHROW);
9205 if (built_in_decls[BUILT_IN_ALLOCA] == NULL)
9207 ftype = build_function_type_list (ptr_type_node,
9208 size_type_node, NULL_TREE);
9209 local_define_builtin ("__builtin_alloca", ftype, BUILT_IN_ALLOCA,
9210 "alloca", ECF_MALLOC | ECF_NOTHROW);
9213 /* If we're checking the stack, `alloca' can throw. */
9214 if (flag_stack_check)
9215 TREE_NOTHROW (built_in_decls[BUILT_IN_ALLOCA]) = 0;
9217 ftype = build_function_type_list (void_type_node,
9218 ptr_type_node, ptr_type_node,
9219 ptr_type_node, NULL_TREE);
9220 local_define_builtin ("__builtin_init_trampoline", ftype,
9221 BUILT_IN_INIT_TRAMPOLINE,
9222 "__builtin_init_trampoline", ECF_NOTHROW);
9224 ftype = build_function_type_list (ptr_type_node, ptr_type_node, NULL_TREE);
9225 local_define_builtin ("__builtin_adjust_trampoline", ftype,
9226 BUILT_IN_ADJUST_TRAMPOLINE,
9227 "__builtin_adjust_trampoline",
9228 ECF_CONST | ECF_NOTHROW);
9230 ftype = build_function_type_list (void_type_node,
9231 ptr_type_node, ptr_type_node, NULL_TREE);
9232 local_define_builtin ("__builtin_nonlocal_goto", ftype,
9233 BUILT_IN_NONLOCAL_GOTO,
9234 "__builtin_nonlocal_goto",
9235 ECF_NORETURN | ECF_NOTHROW);
9237 ftype = build_function_type_list (void_type_node,
9238 ptr_type_node, ptr_type_node, NULL_TREE);
9239 local_define_builtin ("__builtin_setjmp_setup", ftype,
9240 BUILT_IN_SETJMP_SETUP,
9241 "__builtin_setjmp_setup", ECF_NOTHROW);
9243 ftype = build_function_type_list (ptr_type_node, ptr_type_node, NULL_TREE);
9244 local_define_builtin ("__builtin_setjmp_dispatcher", ftype,
9245 BUILT_IN_SETJMP_DISPATCHER,
9246 "__builtin_setjmp_dispatcher",
9247 ECF_PURE | ECF_NOTHROW);
9249 ftype = build_function_type_list (void_type_node, ptr_type_node, NULL_TREE);
9250 local_define_builtin ("__builtin_setjmp_receiver", ftype,
9251 BUILT_IN_SETJMP_RECEIVER,
9252 "__builtin_setjmp_receiver", ECF_NOTHROW);
9254 ftype = build_function_type_list (ptr_type_node, NULL_TREE);
9255 local_define_builtin ("__builtin_stack_save", ftype, BUILT_IN_STACK_SAVE,
9256 "__builtin_stack_save", ECF_NOTHROW);
9258 ftype = build_function_type_list (void_type_node, ptr_type_node, NULL_TREE);
9259 local_define_builtin ("__builtin_stack_restore", ftype,
9260 BUILT_IN_STACK_RESTORE,
9261 "__builtin_stack_restore", ECF_NOTHROW);
9263 ftype = build_function_type_list (void_type_node, NULL_TREE);
9264 local_define_builtin ("__builtin_profile_func_enter", ftype,
9265 BUILT_IN_PROFILE_FUNC_ENTER, "profile_func_enter", 0);
9266 local_define_builtin ("__builtin_profile_func_exit", ftype,
9267 BUILT_IN_PROFILE_FUNC_EXIT, "profile_func_exit", 0);
9269 /* If there's a possibility that we might use the ARM EABI, build the
9270 alternate __cxa_end_cleanup node used to resume from C++ and Java. */
9271 if (targetm.arm_eabi_unwinder)
9273 ftype = build_function_type_list (void_type_node, NULL_TREE);
9274 local_define_builtin ("__builtin_cxa_end_cleanup", ftype,
9275 BUILT_IN_CXA_END_CLEANUP,
9276 "__cxa_end_cleanup", ECF_NORETURN);
9279 ftype = build_function_type_list (void_type_node, ptr_type_node, NULL_TREE);
9280 local_define_builtin ("__builtin_unwind_resume", ftype,
9281 BUILT_IN_UNWIND_RESUME,
9282 (USING_SJLJ_EXCEPTIONS
9283 ? "_Unwind_SjLj_Resume" : "_Unwind_Resume"),
9286 /* The exception object and filter values from the runtime. The argument
9287 must be zero before exception lowering, i.e. from the front end. After
9288 exception lowering, it will be the region number for the exception
9289 landing pad. These functions are PURE instead of CONST to prevent
9290 them from being hoisted past the exception edge that will initialize
9291 its value in the landing pad. */
9292 ftype = build_function_type_list (ptr_type_node,
9293 integer_type_node, NULL_TREE);
9294 local_define_builtin ("__builtin_eh_pointer", ftype, BUILT_IN_EH_POINTER,
9295 "__builtin_eh_pointer", ECF_PURE | ECF_NOTHROW);
9297 tmp = lang_hooks.types.type_for_mode (targetm.eh_return_filter_mode (), 0);
9298 ftype = build_function_type_list (tmp, integer_type_node, NULL_TREE);
9299 local_define_builtin ("__builtin_eh_filter", ftype, BUILT_IN_EH_FILTER,
9300 "__builtin_eh_filter", ECF_PURE | ECF_NOTHROW);
9302 ftype = build_function_type_list (void_type_node,
9303 integer_type_node, integer_type_node,
9305 local_define_builtin ("__builtin_eh_copy_values", ftype,
9306 BUILT_IN_EH_COPY_VALUES,
9307 "__builtin_eh_copy_values", ECF_NOTHROW);
9309 /* Complex multiplication and division. These are handled as builtins
9310 rather than optabs because emit_library_call_value doesn't support
9311 complex. Further, we can do slightly better with folding these
9312 beasties if the real and complex parts of the arguments are separate. */
9316 for (mode = MIN_MODE_COMPLEX_FLOAT; mode <= MAX_MODE_COMPLEX_FLOAT; ++mode)
9318 char mode_name_buf[4], *q;
9320 enum built_in_function mcode, dcode;
9321 tree type, inner_type;
9323 type = lang_hooks.types.type_for_mode ((enum machine_mode) mode, 0);
9326 inner_type = TREE_TYPE (type);
9328 ftype = build_function_type_list (type, inner_type, inner_type,
9329 inner_type, inner_type, NULL_TREE);
9331 mcode = ((enum built_in_function)
9332 (BUILT_IN_COMPLEX_MUL_MIN + mode - MIN_MODE_COMPLEX_FLOAT));
9333 dcode = ((enum built_in_function)
9334 (BUILT_IN_COMPLEX_DIV_MIN + mode - MIN_MODE_COMPLEX_FLOAT));
9336 for (p = GET_MODE_NAME (mode), q = mode_name_buf; *p; p++, q++)
9340 built_in_names[mcode] = concat ("__mul", mode_name_buf, "3", NULL);
9341 local_define_builtin (built_in_names[mcode], ftype, mcode,
9342 built_in_names[mcode], ECF_CONST | ECF_NOTHROW);
9344 built_in_names[dcode] = concat ("__div", mode_name_buf, "3", NULL);
9345 local_define_builtin (built_in_names[dcode], ftype, dcode,
9346 built_in_names[dcode], ECF_CONST | ECF_NOTHROW);
9351 /* HACK. GROSS. This is absolutely disgusting. I wish there was a
9354 If we requested a pointer to a vector, build up the pointers that
9355 we stripped off while looking for the inner type. Similarly for
9356 return values from functions.
9358 The argument TYPE is the top of the chain, and BOTTOM is the
9359 new type which we will point to. */
9362 reconstruct_complex_type (tree type, tree bottom)
9366 if (TREE_CODE (type) == POINTER_TYPE)
9368 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
9369 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
9370 TYPE_REF_CAN_ALIAS_ALL (type));
9372 else if (TREE_CODE (type) == REFERENCE_TYPE)
9374 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
9375 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
9376 TYPE_REF_CAN_ALIAS_ALL (type));
9378 else if (TREE_CODE (type) == ARRAY_TYPE)
9380 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
9381 outer = build_array_type (inner, TYPE_DOMAIN (type));
9383 else if (TREE_CODE (type) == FUNCTION_TYPE)
9385 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
9386 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
9388 else if (TREE_CODE (type) == METHOD_TYPE)
9390 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
9391 /* The build_method_type_directly() routine prepends 'this' to argument list,
9392 so we must compensate by getting rid of it. */
9394 = build_method_type_directly
9395 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
9397 TREE_CHAIN (TYPE_ARG_TYPES (type)));
9399 else if (TREE_CODE (type) == OFFSET_TYPE)
9401 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
9402 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
9407 return build_type_attribute_qual_variant (outer, TYPE_ATTRIBUTES (type),
9411 /* Returns a vector tree node given a mode (integer, vector, or BLKmode) and
9414 build_vector_type_for_mode (tree innertype, enum machine_mode mode)
9418 switch (GET_MODE_CLASS (mode))
9420 case MODE_VECTOR_INT:
9421 case MODE_VECTOR_FLOAT:
9422 case MODE_VECTOR_FRACT:
9423 case MODE_VECTOR_UFRACT:
9424 case MODE_VECTOR_ACCUM:
9425 case MODE_VECTOR_UACCUM:
9426 nunits = GET_MODE_NUNITS (mode);
9430 /* Check that there are no leftover bits. */
9431 gcc_assert (GET_MODE_BITSIZE (mode)
9432 % TREE_INT_CST_LOW (TYPE_SIZE (innertype)) == 0);
9434 nunits = GET_MODE_BITSIZE (mode)
9435 / TREE_INT_CST_LOW (TYPE_SIZE (innertype));
9442 return make_vector_type (innertype, nunits, mode);
9445 /* Similarly, but takes the inner type and number of units, which must be
9449 build_vector_type (tree innertype, int nunits)
9451 return make_vector_type (innertype, nunits, VOIDmode);
9454 /* Similarly, but takes the inner type and number of units, which must be
9458 build_opaque_vector_type (tree innertype, int nunits)
9461 innertype = build_distinct_type_copy (innertype);
9462 t = make_vector_type (innertype, nunits, VOIDmode);
9463 TYPE_VECTOR_OPAQUE (t) = true;
9468 /* Given an initializer INIT, return TRUE if INIT is zero or some
9469 aggregate of zeros. Otherwise return FALSE. */
9471 initializer_zerop (const_tree init)
9477 switch (TREE_CODE (init))
9480 return integer_zerop (init);
9483 /* ??? Note that this is not correct for C4X float formats. There,
9484 a bit pattern of all zeros is 1.0; 0.0 is encoded with the most
9485 negative exponent. */
9486 return real_zerop (init)
9487 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (init));
9490 return fixed_zerop (init);
9493 return integer_zerop (init)
9494 || (real_zerop (init)
9495 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_REALPART (init)))
9496 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_IMAGPART (init))));
9499 for (elt = TREE_VECTOR_CST_ELTS (init); elt; elt = TREE_CHAIN (elt))
9500 if (!initializer_zerop (TREE_VALUE (elt)))
9506 unsigned HOST_WIDE_INT idx;
9508 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (init), idx, elt)
9509 if (!initializer_zerop (elt))
9518 /* We need to loop through all elements to handle cases like
9519 "\0" and "\0foobar". */
9520 for (i = 0; i < TREE_STRING_LENGTH (init); ++i)
9521 if (TREE_STRING_POINTER (init)[i] != '\0')
9532 /* Build an empty statement at location LOC. */
9535 build_empty_stmt (location_t loc)
9537 tree t = build1 (NOP_EXPR, void_type_node, size_zero_node);
9538 SET_EXPR_LOCATION (t, loc);
9543 /* Build an OpenMP clause with code CODE. LOC is the location of the
9547 build_omp_clause (location_t loc, enum omp_clause_code code)
9552 length = omp_clause_num_ops[code];
9553 size = (sizeof (struct tree_omp_clause) + (length - 1) * sizeof (tree));
9555 t = ggc_alloc_tree_node (size);
9556 memset (t, 0, size);
9557 TREE_SET_CODE (t, OMP_CLAUSE);
9558 OMP_CLAUSE_SET_CODE (t, code);
9559 OMP_CLAUSE_LOCATION (t) = loc;
9561 #ifdef GATHER_STATISTICS
9562 tree_node_counts[(int) omp_clause_kind]++;
9563 tree_node_sizes[(int) omp_clause_kind] += size;
9569 /* Build a tcc_vl_exp object with code CODE and room for LEN operands. LEN
9570 includes the implicit operand count in TREE_OPERAND 0, and so must be >= 1.
9571 Except for the CODE and operand count field, other storage for the
9572 object is initialized to zeros. */
9575 build_vl_exp_stat (enum tree_code code, int len MEM_STAT_DECL)
9578 int length = (len - 1) * sizeof (tree) + sizeof (struct tree_exp);
9580 gcc_assert (TREE_CODE_CLASS (code) == tcc_vl_exp);
9581 gcc_assert (len >= 1);
9583 #ifdef GATHER_STATISTICS
9584 tree_node_counts[(int) e_kind]++;
9585 tree_node_sizes[(int) e_kind] += length;
9588 t = ggc_alloc_zone_cleared_tree_node_stat (&tree_zone, length PASS_MEM_STAT);
9590 TREE_SET_CODE (t, code);
9592 /* Can't use TREE_OPERAND to store the length because if checking is
9593 enabled, it will try to check the length before we store it. :-P */
9594 t->exp.operands[0] = build_int_cst (sizetype, len);
9599 /* Build a CALL_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE and
9600 FN and a null static chain slot. NARGS is the number of call arguments
9601 which are specified as "..." arguments. */
9604 build_call_nary (tree return_type, tree fn, int nargs, ...)
9608 va_start (args, nargs);
9609 ret = build_call_valist (return_type, fn, nargs, args);
9614 /* Build a CALL_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE and
9615 FN and a null static chain slot. NARGS is the number of call arguments
9616 which are specified as a va_list ARGS. */
9619 build_call_valist (tree return_type, tree fn, int nargs, va_list args)
9624 t = build_vl_exp (CALL_EXPR, nargs + 3);
9625 TREE_TYPE (t) = return_type;
9626 CALL_EXPR_FN (t) = fn;
9627 CALL_EXPR_STATIC_CHAIN (t) = NULL_TREE;
9628 for (i = 0; i < nargs; i++)
9629 CALL_EXPR_ARG (t, i) = va_arg (args, tree);
9630 process_call_operands (t);
9634 /* Build a CALL_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE and
9635 FN and a null static chain slot. NARGS is the number of call arguments
9636 which are specified as a tree array ARGS. */
9639 build_call_array_loc (location_t loc, tree return_type, tree fn,
9640 int nargs, const tree *args)
9645 t = build_vl_exp (CALL_EXPR, nargs + 3);
9646 TREE_TYPE (t) = return_type;
9647 CALL_EXPR_FN (t) = fn;
9648 CALL_EXPR_STATIC_CHAIN (t) = NULL_TREE;
9649 for (i = 0; i < nargs; i++)
9650 CALL_EXPR_ARG (t, i) = args[i];
9651 process_call_operands (t);
9652 SET_EXPR_LOCATION (t, loc);
9656 /* Like build_call_array, but takes a VEC. */
9659 build_call_vec (tree return_type, tree fn, VEC(tree,gc) *args)
9664 ret = build_vl_exp (CALL_EXPR, VEC_length (tree, args) + 3);
9665 TREE_TYPE (ret) = return_type;
9666 CALL_EXPR_FN (ret) = fn;
9667 CALL_EXPR_STATIC_CHAIN (ret) = NULL_TREE;
9668 FOR_EACH_VEC_ELT (tree, args, ix, t)
9669 CALL_EXPR_ARG (ret, ix) = t;
9670 process_call_operands (ret);
9675 /* Returns true if it is possible to prove that the index of
9676 an array access REF (an ARRAY_REF expression) falls into the
9680 in_array_bounds_p (tree ref)
9682 tree idx = TREE_OPERAND (ref, 1);
9685 if (TREE_CODE (idx) != INTEGER_CST)
9688 min = array_ref_low_bound (ref);
9689 max = array_ref_up_bound (ref);
9692 || TREE_CODE (min) != INTEGER_CST
9693 || TREE_CODE (max) != INTEGER_CST)
9696 if (tree_int_cst_lt (idx, min)
9697 || tree_int_cst_lt (max, idx))
9703 /* Returns true if it is possible to prove that the range of
9704 an array access REF (an ARRAY_RANGE_REF expression) falls
9705 into the array bounds. */
9708 range_in_array_bounds_p (tree ref)
9710 tree domain_type = TYPE_DOMAIN (TREE_TYPE (ref));
9711 tree range_min, range_max, min, max;
9713 range_min = TYPE_MIN_VALUE (domain_type);
9714 range_max = TYPE_MAX_VALUE (domain_type);
9717 || TREE_CODE (range_min) != INTEGER_CST
9718 || TREE_CODE (range_max) != INTEGER_CST)
9721 min = array_ref_low_bound (ref);
9722 max = array_ref_up_bound (ref);
9725 || TREE_CODE (min) != INTEGER_CST
9726 || TREE_CODE (max) != INTEGER_CST)
9729 if (tree_int_cst_lt (range_min, min)
9730 || tree_int_cst_lt (max, range_max))
9736 /* Return true if T (assumed to be a DECL) must be assigned a memory
9740 needs_to_live_in_memory (const_tree t)
9742 if (TREE_CODE (t) == SSA_NAME)
9743 t = SSA_NAME_VAR (t);
9745 return (TREE_ADDRESSABLE (t)
9746 || is_global_var (t)
9747 || (TREE_CODE (t) == RESULT_DECL
9748 && !DECL_BY_REFERENCE (t)
9749 && aggregate_value_p (t, current_function_decl)));
9752 /* There are situations in which a language considers record types
9753 compatible which have different field lists. Decide if two fields
9754 are compatible. It is assumed that the parent records are compatible. */
9757 fields_compatible_p (const_tree f1, const_tree f2)
9759 if (!operand_equal_p (DECL_FIELD_BIT_OFFSET (f1),
9760 DECL_FIELD_BIT_OFFSET (f2), OEP_ONLY_CONST))
9763 if (!operand_equal_p (DECL_FIELD_OFFSET (f1),
9764 DECL_FIELD_OFFSET (f2), OEP_ONLY_CONST))
9767 if (!types_compatible_p (TREE_TYPE (f1), TREE_TYPE (f2)))
9773 /* Locate within RECORD a field that is compatible with ORIG_FIELD. */
9776 find_compatible_field (tree record, tree orig_field)
9780 for (f = TYPE_FIELDS (record); f ; f = TREE_CHAIN (f))
9781 if (TREE_CODE (f) == FIELD_DECL
9782 && fields_compatible_p (f, orig_field))
9785 /* ??? Why isn't this on the main fields list? */
9786 f = TYPE_VFIELD (record);
9787 if (f && TREE_CODE (f) == FIELD_DECL
9788 && fields_compatible_p (f, orig_field))
9791 /* ??? We should abort here, but Java appears to do Bad Things
9792 with inherited fields. */
9796 /* Return value of a constant X and sign-extend it. */
9799 int_cst_value (const_tree x)
9801 unsigned bits = TYPE_PRECISION (TREE_TYPE (x));
9802 unsigned HOST_WIDE_INT val = TREE_INT_CST_LOW (x);
9804 /* Make sure the sign-extended value will fit in a HOST_WIDE_INT. */
9805 gcc_assert (TREE_INT_CST_HIGH (x) == 0
9806 || TREE_INT_CST_HIGH (x) == -1);
9808 if (bits < HOST_BITS_PER_WIDE_INT)
9810 bool negative = ((val >> (bits - 1)) & 1) != 0;
9812 val |= (~(unsigned HOST_WIDE_INT) 0) << (bits - 1) << 1;
9814 val &= ~((~(unsigned HOST_WIDE_INT) 0) << (bits - 1) << 1);
9820 /* Return value of a constant X and sign-extend it. */
9823 widest_int_cst_value (const_tree x)
9825 unsigned bits = TYPE_PRECISION (TREE_TYPE (x));
9826 unsigned HOST_WIDEST_INT val = TREE_INT_CST_LOW (x);
9828 #if HOST_BITS_PER_WIDEST_INT > HOST_BITS_PER_WIDE_INT
9829 gcc_assert (HOST_BITS_PER_WIDEST_INT >= 2 * HOST_BITS_PER_WIDE_INT);
9830 val |= (((unsigned HOST_WIDEST_INT) TREE_INT_CST_HIGH (x))
9831 << HOST_BITS_PER_WIDE_INT);
9833 /* Make sure the sign-extended value will fit in a HOST_WIDE_INT. */
9834 gcc_assert (TREE_INT_CST_HIGH (x) == 0
9835 || TREE_INT_CST_HIGH (x) == -1);
9838 if (bits < HOST_BITS_PER_WIDEST_INT)
9840 bool negative = ((val >> (bits - 1)) & 1) != 0;
9842 val |= (~(unsigned HOST_WIDEST_INT) 0) << (bits - 1) << 1;
9844 val &= ~((~(unsigned HOST_WIDEST_INT) 0) << (bits - 1) << 1);
9850 /* If TYPE is an integral type, return an equivalent type which is
9851 unsigned iff UNSIGNEDP is true. If TYPE is not an integral type,
9852 return TYPE itself. */
9855 signed_or_unsigned_type_for (int unsignedp, tree type)
9858 if (POINTER_TYPE_P (type))
9860 /* If the pointer points to the normal address space, use the
9861 size_type_node. Otherwise use an appropriate size for the pointer
9862 based on the named address space it points to. */
9863 if (!TYPE_ADDR_SPACE (TREE_TYPE (t)))
9866 return lang_hooks.types.type_for_size (TYPE_PRECISION (t), unsignedp);
9869 if (!INTEGRAL_TYPE_P (t) || TYPE_UNSIGNED (t) == unsignedp)
9872 return lang_hooks.types.type_for_size (TYPE_PRECISION (t), unsignedp);
9875 /* Returns unsigned variant of TYPE. */
9878 unsigned_type_for (tree type)
9880 return signed_or_unsigned_type_for (1, type);
9883 /* Returns signed variant of TYPE. */
9886 signed_type_for (tree type)
9888 return signed_or_unsigned_type_for (0, type);
9891 /* Returns the largest value obtainable by casting something in INNER type to
9895 upper_bound_in_type (tree outer, tree inner)
9897 unsigned HOST_WIDE_INT lo, hi;
9898 unsigned int det = 0;
9899 unsigned oprec = TYPE_PRECISION (outer);
9900 unsigned iprec = TYPE_PRECISION (inner);
9903 /* Compute a unique number for every combination. */
9904 det |= (oprec > iprec) ? 4 : 0;
9905 det |= TYPE_UNSIGNED (outer) ? 2 : 0;
9906 det |= TYPE_UNSIGNED (inner) ? 1 : 0;
9908 /* Determine the exponent to use. */
9913 /* oprec <= iprec, outer: signed, inner: don't care. */
9918 /* oprec <= iprec, outer: unsigned, inner: don't care. */
9922 /* oprec > iprec, outer: signed, inner: signed. */
9926 /* oprec > iprec, outer: signed, inner: unsigned. */
9930 /* oprec > iprec, outer: unsigned, inner: signed. */
9934 /* oprec > iprec, outer: unsigned, inner: unsigned. */
9941 /* Compute 2^^prec - 1. */
9942 if (prec <= HOST_BITS_PER_WIDE_INT)
9945 lo = ((~(unsigned HOST_WIDE_INT) 0)
9946 >> (HOST_BITS_PER_WIDE_INT - prec));
9950 hi = ((~(unsigned HOST_WIDE_INT) 0)
9951 >> (2 * HOST_BITS_PER_WIDE_INT - prec));
9952 lo = ~(unsigned HOST_WIDE_INT) 0;
9955 return build_int_cst_wide (outer, lo, hi);
9958 /* Returns the smallest value obtainable by casting something in INNER type to
9962 lower_bound_in_type (tree outer, tree inner)
9964 unsigned HOST_WIDE_INT lo, hi;
9965 unsigned oprec = TYPE_PRECISION (outer);
9966 unsigned iprec = TYPE_PRECISION (inner);
9968 /* If OUTER type is unsigned, we can definitely cast 0 to OUTER type
9970 if (TYPE_UNSIGNED (outer)
9971 /* If we are widening something of an unsigned type, OUTER type
9972 contains all values of INNER type. In particular, both INNER
9973 and OUTER types have zero in common. */
9974 || (oprec > iprec && TYPE_UNSIGNED (inner)))
9978 /* If we are widening a signed type to another signed type, we
9979 want to obtain -2^^(iprec-1). If we are keeping the
9980 precision or narrowing to a signed type, we want to obtain
9982 unsigned prec = oprec > iprec ? iprec : oprec;
9984 if (prec <= HOST_BITS_PER_WIDE_INT)
9986 hi = ~(unsigned HOST_WIDE_INT) 0;
9987 lo = (~(unsigned HOST_WIDE_INT) 0) << (prec - 1);
9991 hi = ((~(unsigned HOST_WIDE_INT) 0)
9992 << (prec - HOST_BITS_PER_WIDE_INT - 1));
9997 return build_int_cst_wide (outer, lo, hi);
10000 /* Return nonzero if two operands that are suitable for PHI nodes are
10001 necessarily equal. Specifically, both ARG0 and ARG1 must be either
10002 SSA_NAME or invariant. Note that this is strictly an optimization.
10003 That is, callers of this function can directly call operand_equal_p
10004 and get the same result, only slower. */
10007 operand_equal_for_phi_arg_p (const_tree arg0, const_tree arg1)
10011 if (TREE_CODE (arg0) == SSA_NAME || TREE_CODE (arg1) == SSA_NAME)
10013 return operand_equal_p (arg0, arg1, 0);
10016 /* Returns number of zeros at the end of binary representation of X.
10018 ??? Use ffs if available? */
10021 num_ending_zeros (const_tree x)
10023 unsigned HOST_WIDE_INT fr, nfr;
10024 unsigned num, abits;
10025 tree type = TREE_TYPE (x);
10027 if (TREE_INT_CST_LOW (x) == 0)
10029 num = HOST_BITS_PER_WIDE_INT;
10030 fr = TREE_INT_CST_HIGH (x);
10035 fr = TREE_INT_CST_LOW (x);
10038 for (abits = HOST_BITS_PER_WIDE_INT / 2; abits; abits /= 2)
10041 if (nfr << abits == fr)
10048 if (num > TYPE_PRECISION (type))
10049 num = TYPE_PRECISION (type);
10051 return build_int_cst_type (type, num);
10055 #define WALK_SUBTREE(NODE) \
10058 result = walk_tree_1 (&(NODE), func, data, pset, lh); \
10064 /* This is a subroutine of walk_tree that walks field of TYPE that are to
10065 be walked whenever a type is seen in the tree. Rest of operands and return
10066 value are as for walk_tree. */
10069 walk_type_fields (tree type, walk_tree_fn func, void *data,
10070 struct pointer_set_t *pset, walk_tree_lh lh)
10072 tree result = NULL_TREE;
10074 switch (TREE_CODE (type))
10077 case REFERENCE_TYPE:
10078 /* We have to worry about mutually recursive pointers. These can't
10079 be written in C. They can in Ada. It's pathological, but
10080 there's an ACATS test (c38102a) that checks it. Deal with this
10081 by checking if we're pointing to another pointer, that one
10082 points to another pointer, that one does too, and we have no htab.
10083 If so, get a hash table. We check three levels deep to avoid
10084 the cost of the hash table if we don't need one. */
10085 if (POINTER_TYPE_P (TREE_TYPE (type))
10086 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (type)))
10087 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (TREE_TYPE (type))))
10090 result = walk_tree_without_duplicates (&TREE_TYPE (type),
10098 /* ... fall through ... */
10101 WALK_SUBTREE (TREE_TYPE (type));
10105 WALK_SUBTREE (TYPE_METHOD_BASETYPE (type));
10107 /* Fall through. */
10109 case FUNCTION_TYPE:
10110 WALK_SUBTREE (TREE_TYPE (type));
10114 /* We never want to walk into default arguments. */
10115 for (arg = TYPE_ARG_TYPES (type); arg; arg = TREE_CHAIN (arg))
10116 WALK_SUBTREE (TREE_VALUE (arg));
10121 /* Don't follow this nodes's type if a pointer for fear that
10122 we'll have infinite recursion. If we have a PSET, then we
10125 || (!POINTER_TYPE_P (TREE_TYPE (type))
10126 && TREE_CODE (TREE_TYPE (type)) != OFFSET_TYPE))
10127 WALK_SUBTREE (TREE_TYPE (type));
10128 WALK_SUBTREE (TYPE_DOMAIN (type));
10132 WALK_SUBTREE (TREE_TYPE (type));
10133 WALK_SUBTREE (TYPE_OFFSET_BASETYPE (type));
10143 /* Apply FUNC to all the sub-trees of TP in a pre-order traversal. FUNC is
10144 called with the DATA and the address of each sub-tree. If FUNC returns a
10145 non-NULL value, the traversal is stopped, and the value returned by FUNC
10146 is returned. If PSET is non-NULL it is used to record the nodes visited,
10147 and to avoid visiting a node more than once. */
10150 walk_tree_1 (tree *tp, walk_tree_fn func, void *data,
10151 struct pointer_set_t *pset, walk_tree_lh lh)
10153 enum tree_code code;
10157 #define WALK_SUBTREE_TAIL(NODE) \
10161 goto tail_recurse; \
10166 /* Skip empty subtrees. */
10170 /* Don't walk the same tree twice, if the user has requested
10171 that we avoid doing so. */
10172 if (pset && pointer_set_insert (pset, *tp))
10175 /* Call the function. */
10177 result = (*func) (tp, &walk_subtrees, data);
10179 /* If we found something, return it. */
10183 code = TREE_CODE (*tp);
10185 /* Even if we didn't, FUNC may have decided that there was nothing
10186 interesting below this point in the tree. */
10187 if (!walk_subtrees)
10189 /* But we still need to check our siblings. */
10190 if (code == TREE_LIST)
10191 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp));
10192 else if (code == OMP_CLAUSE)
10193 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
10200 result = (*lh) (tp, &walk_subtrees, func, data, pset);
10201 if (result || !walk_subtrees)
10208 case IDENTIFIER_NODE:
10215 case PLACEHOLDER_EXPR:
10219 /* None of these have subtrees other than those already walked
10224 WALK_SUBTREE (TREE_VALUE (*tp));
10225 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp));
10230 int len = TREE_VEC_LENGTH (*tp);
10235 /* Walk all elements but the first. */
10237 WALK_SUBTREE (TREE_VEC_ELT (*tp, len));
10239 /* Now walk the first one as a tail call. */
10240 WALK_SUBTREE_TAIL (TREE_VEC_ELT (*tp, 0));
10244 WALK_SUBTREE (TREE_REALPART (*tp));
10245 WALK_SUBTREE_TAIL (TREE_IMAGPART (*tp));
10249 unsigned HOST_WIDE_INT idx;
10250 constructor_elt *ce;
10253 VEC_iterate(constructor_elt, CONSTRUCTOR_ELTS (*tp), idx, ce);
10255 WALK_SUBTREE (ce->value);
10260 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, 0));
10265 for (decl = BIND_EXPR_VARS (*tp); decl; decl = DECL_CHAIN (decl))
10267 /* Walk the DECL_INITIAL and DECL_SIZE. We don't want to walk
10268 into declarations that are just mentioned, rather than
10269 declared; they don't really belong to this part of the tree.
10270 And, we can see cycles: the initializer for a declaration
10271 can refer to the declaration itself. */
10272 WALK_SUBTREE (DECL_INITIAL (decl));
10273 WALK_SUBTREE (DECL_SIZE (decl));
10274 WALK_SUBTREE (DECL_SIZE_UNIT (decl));
10276 WALK_SUBTREE_TAIL (BIND_EXPR_BODY (*tp));
10279 case STATEMENT_LIST:
10281 tree_stmt_iterator i;
10282 for (i = tsi_start (*tp); !tsi_end_p (i); tsi_next (&i))
10283 WALK_SUBTREE (*tsi_stmt_ptr (i));
10288 switch (OMP_CLAUSE_CODE (*tp))
10290 case OMP_CLAUSE_PRIVATE:
10291 case OMP_CLAUSE_SHARED:
10292 case OMP_CLAUSE_FIRSTPRIVATE:
10293 case OMP_CLAUSE_COPYIN:
10294 case OMP_CLAUSE_COPYPRIVATE:
10295 case OMP_CLAUSE_IF:
10296 case OMP_CLAUSE_NUM_THREADS:
10297 case OMP_CLAUSE_SCHEDULE:
10298 WALK_SUBTREE (OMP_CLAUSE_OPERAND (*tp, 0));
10301 case OMP_CLAUSE_NOWAIT:
10302 case OMP_CLAUSE_ORDERED:
10303 case OMP_CLAUSE_DEFAULT:
10304 case OMP_CLAUSE_UNTIED:
10305 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
10307 case OMP_CLAUSE_LASTPRIVATE:
10308 WALK_SUBTREE (OMP_CLAUSE_DECL (*tp));
10309 WALK_SUBTREE (OMP_CLAUSE_LASTPRIVATE_STMT (*tp));
10310 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
10312 case OMP_CLAUSE_COLLAPSE:
10315 for (i = 0; i < 3; i++)
10316 WALK_SUBTREE (OMP_CLAUSE_OPERAND (*tp, i));
10317 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
10320 case OMP_CLAUSE_REDUCTION:
10323 for (i = 0; i < 4; i++)
10324 WALK_SUBTREE (OMP_CLAUSE_OPERAND (*tp, i));
10325 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
10329 gcc_unreachable ();
10337 /* TARGET_EXPRs are peculiar: operands 1 and 3 can be the same.
10338 But, we only want to walk once. */
10339 len = (TREE_OPERAND (*tp, 3) == TREE_OPERAND (*tp, 1)) ? 2 : 3;
10340 for (i = 0; i < len; ++i)
10341 WALK_SUBTREE (TREE_OPERAND (*tp, i));
10342 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, len));
10346 /* If this is a TYPE_DECL, walk into the fields of the type that it's
10347 defining. We only want to walk into these fields of a type in this
10348 case and not in the general case of a mere reference to the type.
10350 The criterion is as follows: if the field can be an expression, it
10351 must be walked only here. This should be in keeping with the fields
10352 that are directly gimplified in gimplify_type_sizes in order for the
10353 mark/copy-if-shared/unmark machinery of the gimplifier to work with
10354 variable-sized types.
10356 Note that DECLs get walked as part of processing the BIND_EXPR. */
10357 if (TREE_CODE (DECL_EXPR_DECL (*tp)) == TYPE_DECL)
10359 tree *type_p = &TREE_TYPE (DECL_EXPR_DECL (*tp));
10360 if (TREE_CODE (*type_p) == ERROR_MARK)
10363 /* Call the function for the type. See if it returns anything or
10364 doesn't want us to continue. If we are to continue, walk both
10365 the normal fields and those for the declaration case. */
10366 result = (*func) (type_p, &walk_subtrees, data);
10367 if (result || !walk_subtrees)
10370 result = walk_type_fields (*type_p, func, data, pset, lh);
10374 /* If this is a record type, also walk the fields. */
10375 if (RECORD_OR_UNION_TYPE_P (*type_p))
10379 for (field = TYPE_FIELDS (*type_p); field;
10380 field = DECL_CHAIN (field))
10382 /* We'd like to look at the type of the field, but we can
10383 easily get infinite recursion. So assume it's pointed
10384 to elsewhere in the tree. Also, ignore things that
10386 if (TREE_CODE (field) != FIELD_DECL)
10389 WALK_SUBTREE (DECL_FIELD_OFFSET (field));
10390 WALK_SUBTREE (DECL_SIZE (field));
10391 WALK_SUBTREE (DECL_SIZE_UNIT (field));
10392 if (TREE_CODE (*type_p) == QUAL_UNION_TYPE)
10393 WALK_SUBTREE (DECL_QUALIFIER (field));
10397 /* Same for scalar types. */
10398 else if (TREE_CODE (*type_p) == BOOLEAN_TYPE
10399 || TREE_CODE (*type_p) == ENUMERAL_TYPE
10400 || TREE_CODE (*type_p) == INTEGER_TYPE
10401 || TREE_CODE (*type_p) == FIXED_POINT_TYPE
10402 || TREE_CODE (*type_p) == REAL_TYPE)
10404 WALK_SUBTREE (TYPE_MIN_VALUE (*type_p));
10405 WALK_SUBTREE (TYPE_MAX_VALUE (*type_p));
10408 WALK_SUBTREE (TYPE_SIZE (*type_p));
10409 WALK_SUBTREE_TAIL (TYPE_SIZE_UNIT (*type_p));
10414 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code)))
10418 /* Walk over all the sub-trees of this operand. */
10419 len = TREE_OPERAND_LENGTH (*tp);
10421 /* Go through the subtrees. We need to do this in forward order so
10422 that the scope of a FOR_EXPR is handled properly. */
10425 for (i = 0; i < len - 1; ++i)
10426 WALK_SUBTREE (TREE_OPERAND (*tp, i));
10427 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, len - 1));
10430 /* If this is a type, walk the needed fields in the type. */
10431 else if (TYPE_P (*tp))
10432 return walk_type_fields (*tp, func, data, pset, lh);
10436 /* We didn't find what we were looking for. */
10439 #undef WALK_SUBTREE_TAIL
10441 #undef WALK_SUBTREE
10443 /* Like walk_tree, but does not walk duplicate nodes more than once. */
10446 walk_tree_without_duplicates_1 (tree *tp, walk_tree_fn func, void *data,
10450 struct pointer_set_t *pset;
10452 pset = pointer_set_create ();
10453 result = walk_tree_1 (tp, func, data, pset, lh);
10454 pointer_set_destroy (pset);
10460 tree_block (tree t)
10462 char const c = TREE_CODE_CLASS (TREE_CODE (t));
10464 if (IS_EXPR_CODE_CLASS (c))
10465 return &t->exp.block;
10466 gcc_unreachable ();
10470 /* Create a nameless artificial label and put it in the current
10471 function context. The label has a location of LOC. Returns the
10472 newly created label. */
10475 create_artificial_label (location_t loc)
10477 tree lab = build_decl (loc,
10478 LABEL_DECL, NULL_TREE, void_type_node);
10480 DECL_ARTIFICIAL (lab) = 1;
10481 DECL_IGNORED_P (lab) = 1;
10482 DECL_CONTEXT (lab) = current_function_decl;
10486 /* Given a tree, try to return a useful variable name that we can use
10487 to prefix a temporary that is being assigned the value of the tree.
10488 I.E. given <temp> = &A, return A. */
10493 tree stripped_decl;
10496 STRIP_NOPS (stripped_decl);
10497 if (DECL_P (stripped_decl) && DECL_NAME (stripped_decl))
10498 return IDENTIFIER_POINTER (DECL_NAME (stripped_decl));
10501 switch (TREE_CODE (stripped_decl))
10504 return get_name (TREE_OPERAND (stripped_decl, 0));
10511 /* Return true if TYPE has a variable argument list. */
10514 stdarg_p (const_tree fntype)
10516 function_args_iterator args_iter;
10517 tree n = NULL_TREE, t;
10522 FOREACH_FUNCTION_ARGS(fntype, t, args_iter)
10527 return n != NULL_TREE && n != void_type_node;
10530 /* Return true if TYPE has a prototype. */
10533 prototype_p (tree fntype)
10537 gcc_assert (fntype != NULL_TREE);
10539 t = TYPE_ARG_TYPES (fntype);
10540 return (t != NULL_TREE);
10543 /* If BLOCK is inlined from an __attribute__((__artificial__))
10544 routine, return pointer to location from where it has been
10547 block_nonartificial_location (tree block)
10549 location_t *ret = NULL;
10551 while (block && TREE_CODE (block) == BLOCK
10552 && BLOCK_ABSTRACT_ORIGIN (block))
10554 tree ao = BLOCK_ABSTRACT_ORIGIN (block);
10556 while (TREE_CODE (ao) == BLOCK
10557 && BLOCK_ABSTRACT_ORIGIN (ao)
10558 && BLOCK_ABSTRACT_ORIGIN (ao) != ao)
10559 ao = BLOCK_ABSTRACT_ORIGIN (ao);
10561 if (TREE_CODE (ao) == FUNCTION_DECL)
10563 /* If AO is an artificial inline, point RET to the
10564 call site locus at which it has been inlined and continue
10565 the loop, in case AO's caller is also an artificial
10567 if (DECL_DECLARED_INLINE_P (ao)
10568 && lookup_attribute ("artificial", DECL_ATTRIBUTES (ao)))
10569 ret = &BLOCK_SOURCE_LOCATION (block);
10573 else if (TREE_CODE (ao) != BLOCK)
10576 block = BLOCK_SUPERCONTEXT (block);
10582 /* If EXP is inlined from an __attribute__((__artificial__))
10583 function, return the location of the original call expression. */
10586 tree_nonartificial_location (tree exp)
10588 location_t *loc = block_nonartificial_location (TREE_BLOCK (exp));
10593 return EXPR_LOCATION (exp);
10597 /* These are the hash table functions for the hash table of OPTIMIZATION_NODEq
10600 /* Return the hash code code X, an OPTIMIZATION_NODE or TARGET_OPTION code. */
10603 cl_option_hash_hash (const void *x)
10605 const_tree const t = (const_tree) x;
10609 hashval_t hash = 0;
10611 if (TREE_CODE (t) == OPTIMIZATION_NODE)
10613 p = (const char *)TREE_OPTIMIZATION (t);
10614 len = sizeof (struct cl_optimization);
10617 else if (TREE_CODE (t) == TARGET_OPTION_NODE)
10619 p = (const char *)TREE_TARGET_OPTION (t);
10620 len = sizeof (struct cl_target_option);
10624 gcc_unreachable ();
10626 /* assume most opt flags are just 0/1, some are 2-3, and a few might be
10628 for (i = 0; i < len; i++)
10630 hash = (hash << 4) ^ ((i << 2) | p[i]);
10635 /* Return nonzero if the value represented by *X (an OPTIMIZATION or
10636 TARGET_OPTION tree node) is the same as that given by *Y, which is the
10640 cl_option_hash_eq (const void *x, const void *y)
10642 const_tree const xt = (const_tree) x;
10643 const_tree const yt = (const_tree) y;
10648 if (TREE_CODE (xt) != TREE_CODE (yt))
10651 if (TREE_CODE (xt) == OPTIMIZATION_NODE)
10653 xp = (const char *)TREE_OPTIMIZATION (xt);
10654 yp = (const char *)TREE_OPTIMIZATION (yt);
10655 len = sizeof (struct cl_optimization);
10658 else if (TREE_CODE (xt) == TARGET_OPTION_NODE)
10660 xp = (const char *)TREE_TARGET_OPTION (xt);
10661 yp = (const char *)TREE_TARGET_OPTION (yt);
10662 len = sizeof (struct cl_target_option);
10666 gcc_unreachable ();
10668 return (memcmp (xp, yp, len) == 0);
10671 /* Build an OPTIMIZATION_NODE based on the current options. */
10674 build_optimization_node (void)
10679 /* Use the cache of optimization nodes. */
10681 cl_optimization_save (TREE_OPTIMIZATION (cl_optimization_node));
10683 slot = htab_find_slot (cl_option_hash_table, cl_optimization_node, INSERT);
10687 /* Insert this one into the hash table. */
10688 t = cl_optimization_node;
10691 /* Make a new node for next time round. */
10692 cl_optimization_node = make_node (OPTIMIZATION_NODE);
10698 /* Build a TARGET_OPTION_NODE based on the current options. */
10701 build_target_option_node (void)
10706 /* Use the cache of optimization nodes. */
10708 cl_target_option_save (TREE_TARGET_OPTION (cl_target_option_node));
10710 slot = htab_find_slot (cl_option_hash_table, cl_target_option_node, INSERT);
10714 /* Insert this one into the hash table. */
10715 t = cl_target_option_node;
10718 /* Make a new node for next time round. */
10719 cl_target_option_node = make_node (TARGET_OPTION_NODE);
10725 /* Determine the "ultimate origin" of a block. The block may be an inlined
10726 instance of an inlined instance of a block which is local to an inline
10727 function, so we have to trace all of the way back through the origin chain
10728 to find out what sort of node actually served as the original seed for the
10732 block_ultimate_origin (const_tree block)
10734 tree immediate_origin = BLOCK_ABSTRACT_ORIGIN (block);
10736 /* output_inline_function sets BLOCK_ABSTRACT_ORIGIN for all the
10737 nodes in the function to point to themselves; ignore that if
10738 we're trying to output the abstract instance of this function. */
10739 if (BLOCK_ABSTRACT (block) && immediate_origin == block)
10742 if (immediate_origin == NULL_TREE)
10747 tree lookahead = immediate_origin;
10751 ret_val = lookahead;
10752 lookahead = (TREE_CODE (ret_val) == BLOCK
10753 ? BLOCK_ABSTRACT_ORIGIN (ret_val) : NULL);
10755 while (lookahead != NULL && lookahead != ret_val);
10757 /* The block's abstract origin chain may not be the *ultimate* origin of
10758 the block. It could lead to a DECL that has an abstract origin set.
10759 If so, we want that DECL's abstract origin (which is what DECL_ORIGIN
10760 will give us if it has one). Note that DECL's abstract origins are
10761 supposed to be the most distant ancestor (or so decl_ultimate_origin
10762 claims), so we don't need to loop following the DECL origins. */
10763 if (DECL_P (ret_val))
10764 return DECL_ORIGIN (ret_val);
10770 /* Return true if T1 and T2 are equivalent lists. */
10773 list_equal_p (const_tree t1, const_tree t2)
10775 for (; t1 && t2; t1 = TREE_CHAIN (t1) , t2 = TREE_CHAIN (t2))
10776 if (TREE_VALUE (t1) != TREE_VALUE (t2))
10781 /* Return true iff conversion in EXP generates no instruction. Mark
10782 it inline so that we fully inline into the stripping functions even
10783 though we have two uses of this function. */
10786 tree_nop_conversion (const_tree exp)
10788 tree outer_type, inner_type;
10790 if (!CONVERT_EXPR_P (exp)
10791 && TREE_CODE (exp) != NON_LVALUE_EXPR)
10793 if (TREE_OPERAND (exp, 0) == error_mark_node)
10796 outer_type = TREE_TYPE (exp);
10797 inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
10802 /* Use precision rather then machine mode when we can, which gives
10803 the correct answer even for submode (bit-field) types. */
10804 if ((INTEGRAL_TYPE_P (outer_type)
10805 || POINTER_TYPE_P (outer_type)
10806 || TREE_CODE (outer_type) == OFFSET_TYPE)
10807 && (INTEGRAL_TYPE_P (inner_type)
10808 || POINTER_TYPE_P (inner_type)
10809 || TREE_CODE (inner_type) == OFFSET_TYPE))
10810 return TYPE_PRECISION (outer_type) == TYPE_PRECISION (inner_type);
10812 /* Otherwise fall back on comparing machine modes (e.g. for
10813 aggregate types, floats). */
10814 return TYPE_MODE (outer_type) == TYPE_MODE (inner_type);
10817 /* Return true iff conversion in EXP generates no instruction. Don't
10818 consider conversions changing the signedness. */
10821 tree_sign_nop_conversion (const_tree exp)
10823 tree outer_type, inner_type;
10825 if (!tree_nop_conversion (exp))
10828 outer_type = TREE_TYPE (exp);
10829 inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
10831 return (TYPE_UNSIGNED (outer_type) == TYPE_UNSIGNED (inner_type)
10832 && POINTER_TYPE_P (outer_type) == POINTER_TYPE_P (inner_type));
10835 /* Strip conversions from EXP according to tree_nop_conversion and
10836 return the resulting expression. */
10839 tree_strip_nop_conversions (tree exp)
10841 while (tree_nop_conversion (exp))
10842 exp = TREE_OPERAND (exp, 0);
10846 /* Strip conversions from EXP according to tree_sign_nop_conversion
10847 and return the resulting expression. */
10850 tree_strip_sign_nop_conversions (tree exp)
10852 while (tree_sign_nop_conversion (exp))
10853 exp = TREE_OPERAND (exp, 0);
10857 static GTY(()) tree gcc_eh_personality_decl;
10859 /* Return the GCC personality function decl. */
10862 lhd_gcc_personality (void)
10864 if (!gcc_eh_personality_decl)
10865 gcc_eh_personality_decl
10866 = build_personality_function (USING_SJLJ_EXCEPTIONS
10867 ? "__gcc_personality_sj0"
10868 : "__gcc_personality_v0");
10870 return gcc_eh_personality_decl;
10873 /* Try to find a base info of BINFO that would have its field decl at offset
10874 OFFSET within the BINFO type and which is of EXPECTED_TYPE. If it can be
10875 found, return, otherwise return NULL_TREE. */
10878 get_binfo_at_offset (tree binfo, HOST_WIDE_INT offset, tree expected_type)
10885 type = TREE_TYPE (binfo);
10888 tree base_binfo, found_binfo;
10889 HOST_WIDE_INT pos, size;
10893 if (TREE_CODE (type) != RECORD_TYPE)
10896 for (fld = TYPE_FIELDS (type); fld; fld = DECL_CHAIN (fld))
10898 if (TREE_CODE (fld) != FIELD_DECL)
10901 pos = int_bit_position (fld);
10902 size = tree_low_cst (DECL_SIZE (fld), 1);
10903 if (pos <= offset && (pos + size) > offset)
10909 found_binfo = NULL_TREE;
10910 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
10911 if (TREE_TYPE (base_binfo) == TREE_TYPE (fld))
10913 found_binfo = base_binfo;
10920 type = TREE_TYPE (fld);
10921 binfo = found_binfo;
10924 if (type != expected_type)
10929 /* Returns true if X is a typedef decl. */
10932 is_typedef_decl (tree x)
10934 return (x && TREE_CODE (x) == TYPE_DECL
10935 && DECL_ORIGINAL_TYPE (x) != NULL_TREE);
10938 /* Returns true iff TYPE is a type variant created for a typedef. */
10941 typedef_variant_p (tree type)
10943 return is_typedef_decl (TYPE_NAME (type));
10946 #include "gt-tree.h"