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 2011, 2012 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"
44 #include "filenames.h"
47 #include "common/common-target.h"
48 #include "langhooks.h"
49 #include "tree-inline.h"
50 #include "tree-iterator.h"
51 #include "basic-block.h"
52 #include "tree-flow.h"
54 #include "pointer-set.h"
55 #include "tree-pass.h"
56 #include "langhooks-def.h"
57 #include "diagnostic.h"
58 #include "tree-diagnostic.h"
59 #include "tree-pretty-print.h"
66 /* Tree code classes. */
68 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
69 #define END_OF_BASE_TREE_CODES tcc_exceptional,
71 const enum tree_code_class tree_code_type[] = {
72 #include "all-tree.def"
76 #undef END_OF_BASE_TREE_CODES
78 /* Table indexed by tree code giving number of expression
79 operands beyond the fixed part of the node structure.
80 Not used for types or decls. */
82 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
83 #define END_OF_BASE_TREE_CODES 0,
85 const unsigned char tree_code_length[] = {
86 #include "all-tree.def"
90 #undef END_OF_BASE_TREE_CODES
92 /* Names of tree components.
93 Used for printing out the tree and error messages. */
94 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
95 #define END_OF_BASE_TREE_CODES "@dummy",
97 const char *const tree_code_name[] = {
98 #include "all-tree.def"
102 #undef END_OF_BASE_TREE_CODES
104 /* Each tree code class has an associated string representation.
105 These must correspond to the tree_code_class entries. */
107 const char *const tree_code_class_strings[] =
122 /* obstack.[ch] explicitly declined to prototype this. */
123 extern int _obstack_allocated_p (struct obstack *h, void *obj);
125 #ifdef GATHER_STATISTICS
126 /* Statistics-gathering stuff. */
128 static int tree_code_counts[MAX_TREE_CODES];
129 int tree_node_counts[(int) all_kinds];
130 int tree_node_sizes[(int) all_kinds];
132 /* Keep in sync with tree.h:enum tree_node_kind. */
133 static const char * const tree_node_kind_names[] = {
151 #endif /* GATHER_STATISTICS */
153 /* Unique id for next decl created. */
154 static GTY(()) int next_decl_uid;
155 /* Unique id for next type created. */
156 static GTY(()) int next_type_uid = 1;
157 /* Unique id for next debug decl created. Use negative numbers,
158 to catch erroneous uses. */
159 static GTY(()) int next_debug_decl_uid;
161 /* Since we cannot rehash a type after it is in the table, we have to
162 keep the hash code. */
164 struct GTY(()) type_hash {
169 /* Initial size of the hash table (rounded to next prime). */
170 #define TYPE_HASH_INITIAL_SIZE 1000
172 /* Now here is the hash table. When recording a type, it is added to
173 the slot whose index is the hash code. Note that the hash table is
174 used for several kinds of types (function types, array types and
175 array index range types, for now). While all these live in the
176 same table, they are completely independent, and the hash code is
177 computed differently for each of these. */
179 static GTY ((if_marked ("type_hash_marked_p"), param_is (struct type_hash)))
180 htab_t type_hash_table;
182 /* Hash table and temporary node for larger integer const values. */
183 static GTY (()) tree int_cst_node;
184 static GTY ((if_marked ("ggc_marked_p"), param_is (union tree_node)))
185 htab_t int_cst_hash_table;
187 /* Hash table for optimization flags and target option flags. Use the same
188 hash table for both sets of options. Nodes for building the current
189 optimization and target option nodes. The assumption is most of the time
190 the options created will already be in the hash table, so we avoid
191 allocating and freeing up a node repeatably. */
192 static GTY (()) tree cl_optimization_node;
193 static GTY (()) tree cl_target_option_node;
194 static GTY ((if_marked ("ggc_marked_p"), param_is (union tree_node)))
195 htab_t cl_option_hash_table;
197 /* General tree->tree mapping structure for use in hash tables. */
200 static GTY ((if_marked ("tree_decl_map_marked_p"), param_is (struct tree_decl_map)))
201 htab_t debug_expr_for_decl;
203 static GTY ((if_marked ("tree_decl_map_marked_p"), param_is (struct tree_decl_map)))
204 htab_t value_expr_for_decl;
206 static GTY ((if_marked ("tree_vec_map_marked_p"), param_is (struct tree_vec_map)))
207 htab_t debug_args_for_decl;
209 static GTY ((if_marked ("tree_priority_map_marked_p"),
210 param_is (struct tree_priority_map)))
211 htab_t init_priority_for_decl;
213 static void set_type_quals (tree, int);
214 static int type_hash_eq (const void *, const void *);
215 static hashval_t type_hash_hash (const void *);
216 static hashval_t int_cst_hash_hash (const void *);
217 static int int_cst_hash_eq (const void *, const void *);
218 static hashval_t cl_option_hash_hash (const void *);
219 static int cl_option_hash_eq (const void *, const void *);
220 static void print_type_hash_statistics (void);
221 static void print_debug_expr_statistics (void);
222 static void print_value_expr_statistics (void);
223 static int type_hash_marked_p (const void *);
224 static unsigned int type_hash_list (const_tree, hashval_t);
225 static unsigned int attribute_hash_list (const_tree, hashval_t);
227 tree global_trees[TI_MAX];
228 tree integer_types[itk_none];
230 unsigned char tree_contains_struct[MAX_TREE_CODES][64];
232 /* Number of operands for each OpenMP clause. */
233 unsigned const char omp_clause_num_ops[] =
235 0, /* OMP_CLAUSE_ERROR */
236 1, /* OMP_CLAUSE_PRIVATE */
237 1, /* OMP_CLAUSE_SHARED */
238 1, /* OMP_CLAUSE_FIRSTPRIVATE */
239 2, /* OMP_CLAUSE_LASTPRIVATE */
240 4, /* OMP_CLAUSE_REDUCTION */
241 1, /* OMP_CLAUSE_COPYIN */
242 1, /* OMP_CLAUSE_COPYPRIVATE */
243 1, /* OMP_CLAUSE_IF */
244 1, /* OMP_CLAUSE_NUM_THREADS */
245 1, /* OMP_CLAUSE_SCHEDULE */
246 0, /* OMP_CLAUSE_NOWAIT */
247 0, /* OMP_CLAUSE_ORDERED */
248 0, /* OMP_CLAUSE_DEFAULT */
249 3, /* OMP_CLAUSE_COLLAPSE */
250 0, /* OMP_CLAUSE_UNTIED */
251 1, /* OMP_CLAUSE_FINAL */
252 0 /* OMP_CLAUSE_MERGEABLE */
255 const char * const omp_clause_code_name[] =
278 /* Return the tree node structure used by tree code CODE. */
280 static inline enum tree_node_structure_enum
281 tree_node_structure_for_code (enum tree_code code)
283 switch (TREE_CODE_CLASS (code))
285 case tcc_declaration:
290 return TS_FIELD_DECL;
296 return TS_LABEL_DECL;
298 return TS_RESULT_DECL;
299 case DEBUG_EXPR_DECL:
302 return TS_CONST_DECL;
306 return TS_FUNCTION_DECL;
307 case TRANSLATION_UNIT_DECL:
308 return TS_TRANSLATION_UNIT_DECL;
310 return TS_DECL_NON_COMMON;
314 return TS_TYPE_NON_COMMON;
323 default: /* tcc_constant and tcc_exceptional */
328 /* tcc_constant cases. */
329 case INTEGER_CST: return TS_INT_CST;
330 case REAL_CST: return TS_REAL_CST;
331 case FIXED_CST: return TS_FIXED_CST;
332 case COMPLEX_CST: return TS_COMPLEX;
333 case VECTOR_CST: return TS_VECTOR;
334 case STRING_CST: return TS_STRING;
335 /* tcc_exceptional cases. */
336 case ERROR_MARK: return TS_COMMON;
337 case IDENTIFIER_NODE: return TS_IDENTIFIER;
338 case TREE_LIST: return TS_LIST;
339 case TREE_VEC: return TS_VEC;
340 case SSA_NAME: return TS_SSA_NAME;
341 case PLACEHOLDER_EXPR: return TS_COMMON;
342 case STATEMENT_LIST: return TS_STATEMENT_LIST;
343 case BLOCK: return TS_BLOCK;
344 case CONSTRUCTOR: return TS_CONSTRUCTOR;
345 case TREE_BINFO: return TS_BINFO;
346 case OMP_CLAUSE: return TS_OMP_CLAUSE;
347 case OPTIMIZATION_NODE: return TS_OPTIMIZATION;
348 case TARGET_OPTION_NODE: return TS_TARGET_OPTION;
356 /* Initialize tree_contains_struct to describe the hierarchy of tree
360 initialize_tree_contains_struct (void)
364 for (i = ERROR_MARK; i < LAST_AND_UNUSED_TREE_CODE; i++)
367 enum tree_node_structure_enum ts_code;
369 code = (enum tree_code) i;
370 ts_code = tree_node_structure_for_code (code);
372 /* Mark the TS structure itself. */
373 tree_contains_struct[code][ts_code] = 1;
375 /* Mark all the structures that TS is derived from. */
393 case TS_STATEMENT_LIST:
394 MARK_TS_TYPED (code);
398 case TS_DECL_MINIMAL:
404 case TS_OPTIMIZATION:
405 case TS_TARGET_OPTION:
406 MARK_TS_COMMON (code);
409 case TS_TYPE_WITH_LANG_SPECIFIC:
410 MARK_TS_TYPE_COMMON (code);
413 case TS_TYPE_NON_COMMON:
414 MARK_TS_TYPE_WITH_LANG_SPECIFIC (code);
418 MARK_TS_DECL_MINIMAL (code);
423 MARK_TS_DECL_COMMON (code);
426 case TS_DECL_NON_COMMON:
427 MARK_TS_DECL_WITH_VIS (code);
430 case TS_DECL_WITH_VIS:
434 MARK_TS_DECL_WRTL (code);
438 MARK_TS_DECL_COMMON (code);
442 MARK_TS_DECL_WITH_VIS (code);
446 case TS_FUNCTION_DECL:
447 MARK_TS_DECL_NON_COMMON (code);
450 case TS_TRANSLATION_UNIT_DECL:
451 MARK_TS_DECL_COMMON (code);
459 /* Basic consistency checks for attributes used in fold. */
460 gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_NON_COMMON]);
461 gcc_assert (tree_contains_struct[TYPE_DECL][TS_DECL_NON_COMMON]);
462 gcc_assert (tree_contains_struct[CONST_DECL][TS_DECL_COMMON]);
463 gcc_assert (tree_contains_struct[VAR_DECL][TS_DECL_COMMON]);
464 gcc_assert (tree_contains_struct[PARM_DECL][TS_DECL_COMMON]);
465 gcc_assert (tree_contains_struct[RESULT_DECL][TS_DECL_COMMON]);
466 gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_COMMON]);
467 gcc_assert (tree_contains_struct[TYPE_DECL][TS_DECL_COMMON]);
468 gcc_assert (tree_contains_struct[TRANSLATION_UNIT_DECL][TS_DECL_COMMON]);
469 gcc_assert (tree_contains_struct[LABEL_DECL][TS_DECL_COMMON]);
470 gcc_assert (tree_contains_struct[FIELD_DECL][TS_DECL_COMMON]);
471 gcc_assert (tree_contains_struct[VAR_DECL][TS_DECL_WRTL]);
472 gcc_assert (tree_contains_struct[PARM_DECL][TS_DECL_WRTL]);
473 gcc_assert (tree_contains_struct[RESULT_DECL][TS_DECL_WRTL]);
474 gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_WRTL]);
475 gcc_assert (tree_contains_struct[LABEL_DECL][TS_DECL_WRTL]);
476 gcc_assert (tree_contains_struct[CONST_DECL][TS_DECL_MINIMAL]);
477 gcc_assert (tree_contains_struct[VAR_DECL][TS_DECL_MINIMAL]);
478 gcc_assert (tree_contains_struct[PARM_DECL][TS_DECL_MINIMAL]);
479 gcc_assert (tree_contains_struct[RESULT_DECL][TS_DECL_MINIMAL]);
480 gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_MINIMAL]);
481 gcc_assert (tree_contains_struct[TYPE_DECL][TS_DECL_MINIMAL]);
482 gcc_assert (tree_contains_struct[TRANSLATION_UNIT_DECL][TS_DECL_MINIMAL]);
483 gcc_assert (tree_contains_struct[LABEL_DECL][TS_DECL_MINIMAL]);
484 gcc_assert (tree_contains_struct[FIELD_DECL][TS_DECL_MINIMAL]);
485 gcc_assert (tree_contains_struct[VAR_DECL][TS_DECL_WITH_VIS]);
486 gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_DECL_WITH_VIS]);
487 gcc_assert (tree_contains_struct[TYPE_DECL][TS_DECL_WITH_VIS]);
488 gcc_assert (tree_contains_struct[VAR_DECL][TS_VAR_DECL]);
489 gcc_assert (tree_contains_struct[FIELD_DECL][TS_FIELD_DECL]);
490 gcc_assert (tree_contains_struct[PARM_DECL][TS_PARM_DECL]);
491 gcc_assert (tree_contains_struct[LABEL_DECL][TS_LABEL_DECL]);
492 gcc_assert (tree_contains_struct[RESULT_DECL][TS_RESULT_DECL]);
493 gcc_assert (tree_contains_struct[CONST_DECL][TS_CONST_DECL]);
494 gcc_assert (tree_contains_struct[TYPE_DECL][TS_TYPE_DECL]);
495 gcc_assert (tree_contains_struct[FUNCTION_DECL][TS_FUNCTION_DECL]);
496 gcc_assert (tree_contains_struct[IMPORTED_DECL][TS_DECL_MINIMAL]);
497 gcc_assert (tree_contains_struct[IMPORTED_DECL][TS_DECL_COMMON]);
506 /* Initialize the hash table of types. */
507 type_hash_table = htab_create_ggc (TYPE_HASH_INITIAL_SIZE, type_hash_hash,
510 debug_expr_for_decl = htab_create_ggc (512, tree_decl_map_hash,
511 tree_decl_map_eq, 0);
513 value_expr_for_decl = htab_create_ggc (512, tree_decl_map_hash,
514 tree_decl_map_eq, 0);
515 init_priority_for_decl = htab_create_ggc (512, tree_priority_map_hash,
516 tree_priority_map_eq, 0);
518 int_cst_hash_table = htab_create_ggc (1024, int_cst_hash_hash,
519 int_cst_hash_eq, NULL);
521 int_cst_node = make_node (INTEGER_CST);
523 cl_option_hash_table = htab_create_ggc (64, cl_option_hash_hash,
524 cl_option_hash_eq, NULL);
526 cl_optimization_node = make_node (OPTIMIZATION_NODE);
527 cl_target_option_node = make_node (TARGET_OPTION_NODE);
529 /* Initialize the tree_contains_struct array. */
530 initialize_tree_contains_struct ();
531 lang_hooks.init_ts ();
535 /* The name of the object as the assembler will see it (but before any
536 translations made by ASM_OUTPUT_LABELREF). Often this is the same
537 as DECL_NAME. It is an IDENTIFIER_NODE. */
539 decl_assembler_name (tree decl)
541 if (!DECL_ASSEMBLER_NAME_SET_P (decl))
542 lang_hooks.set_decl_assembler_name (decl);
543 return DECL_WITH_VIS_CHECK (decl)->decl_with_vis.assembler_name;
546 /* Compare ASMNAME with the DECL_ASSEMBLER_NAME of DECL. */
549 decl_assembler_name_equal (tree decl, const_tree asmname)
551 tree decl_asmname = DECL_ASSEMBLER_NAME (decl);
552 const char *decl_str;
553 const char *asmname_str;
556 if (decl_asmname == asmname)
559 decl_str = IDENTIFIER_POINTER (decl_asmname);
560 asmname_str = IDENTIFIER_POINTER (asmname);
563 /* If the target assembler name was set by the user, things are trickier.
564 We have a leading '*' to begin with. After that, it's arguable what
565 is the correct thing to do with -fleading-underscore. Arguably, we've
566 historically been doing the wrong thing in assemble_alias by always
567 printing the leading underscore. Since we're not changing that, make
568 sure user_label_prefix follows the '*' before matching. */
569 if (decl_str[0] == '*')
571 size_t ulp_len = strlen (user_label_prefix);
577 else if (strncmp (decl_str, user_label_prefix, ulp_len) == 0)
578 decl_str += ulp_len, test=true;
582 if (asmname_str[0] == '*')
584 size_t ulp_len = strlen (user_label_prefix);
590 else if (strncmp (asmname_str, user_label_prefix, ulp_len) == 0)
591 asmname_str += ulp_len, test=true;
598 return strcmp (decl_str, asmname_str) == 0;
601 /* Hash asmnames ignoring the user specified marks. */
604 decl_assembler_name_hash (const_tree asmname)
606 if (IDENTIFIER_POINTER (asmname)[0] == '*')
608 const char *decl_str = IDENTIFIER_POINTER (asmname) + 1;
609 size_t ulp_len = strlen (user_label_prefix);
613 else if (strncmp (decl_str, user_label_prefix, ulp_len) == 0)
616 return htab_hash_string (decl_str);
619 return htab_hash_string (IDENTIFIER_POINTER (asmname));
622 /* Compute the number of bytes occupied by a tree with code CODE.
623 This function cannot be used for nodes that have variable sizes,
624 including TREE_VEC, STRING_CST, and CALL_EXPR. */
626 tree_code_size (enum tree_code code)
628 switch (TREE_CODE_CLASS (code))
630 case tcc_declaration: /* A decl node */
635 return sizeof (struct tree_field_decl);
637 return sizeof (struct tree_parm_decl);
639 return sizeof (struct tree_var_decl);
641 return sizeof (struct tree_label_decl);
643 return sizeof (struct tree_result_decl);
645 return sizeof (struct tree_const_decl);
647 return sizeof (struct tree_type_decl);
649 return sizeof (struct tree_function_decl);
650 case DEBUG_EXPR_DECL:
651 return sizeof (struct tree_decl_with_rtl);
653 return sizeof (struct tree_decl_non_common);
657 case tcc_type: /* a type node */
658 return sizeof (struct tree_type_non_common);
660 case tcc_reference: /* a reference */
661 case tcc_expression: /* an expression */
662 case tcc_statement: /* an expression with side effects */
663 case tcc_comparison: /* a comparison expression */
664 case tcc_unary: /* a unary arithmetic expression */
665 case tcc_binary: /* a binary arithmetic expression */
666 return (sizeof (struct tree_exp)
667 + (TREE_CODE_LENGTH (code) - 1) * sizeof (tree));
669 case tcc_constant: /* a constant */
672 case INTEGER_CST: return sizeof (struct tree_int_cst);
673 case REAL_CST: return sizeof (struct tree_real_cst);
674 case FIXED_CST: return sizeof (struct tree_fixed_cst);
675 case COMPLEX_CST: return sizeof (struct tree_complex);
676 case VECTOR_CST: return sizeof (struct tree_vector);
677 case STRING_CST: gcc_unreachable ();
679 return lang_hooks.tree_size (code);
682 case tcc_exceptional: /* something random, like an identifier. */
685 case IDENTIFIER_NODE: return lang_hooks.identifier_size;
686 case TREE_LIST: return sizeof (struct tree_list);
689 case PLACEHOLDER_EXPR: return sizeof (struct tree_common);
692 case OMP_CLAUSE: gcc_unreachable ();
694 case SSA_NAME: return sizeof (struct tree_ssa_name);
696 case STATEMENT_LIST: return sizeof (struct tree_statement_list);
697 case BLOCK: return sizeof (struct tree_block);
698 case CONSTRUCTOR: return sizeof (struct tree_constructor);
699 case OPTIMIZATION_NODE: return sizeof (struct tree_optimization_option);
700 case TARGET_OPTION_NODE: return sizeof (struct tree_target_option);
703 return lang_hooks.tree_size (code);
711 /* Compute the number of bytes occupied by NODE. This routine only
712 looks at TREE_CODE, except for those nodes that have variable sizes. */
714 tree_size (const_tree node)
716 const enum tree_code code = TREE_CODE (node);
720 return (offsetof (struct tree_binfo, base_binfos)
721 + VEC_embedded_size (tree, BINFO_N_BASE_BINFOS (node)));
724 return (sizeof (struct tree_vec)
725 + (TREE_VEC_LENGTH (node) - 1) * sizeof (tree));
728 return TREE_STRING_LENGTH (node) + offsetof (struct tree_string, str) + 1;
731 return (sizeof (struct tree_omp_clause)
732 + (omp_clause_num_ops[OMP_CLAUSE_CODE (node)] - 1)
736 if (TREE_CODE_CLASS (code) == tcc_vl_exp)
737 return (sizeof (struct tree_exp)
738 + (VL_EXP_OPERAND_LENGTH (node) - 1) * sizeof (tree));
740 return tree_code_size (code);
744 /* Record interesting allocation statistics for a tree node with CODE
748 record_node_allocation_statistics (enum tree_code code ATTRIBUTE_UNUSED,
749 size_t length ATTRIBUTE_UNUSED)
751 #ifdef GATHER_STATISTICS
752 enum tree_code_class type = TREE_CODE_CLASS (code);
757 case tcc_declaration: /* A decl node */
761 case tcc_type: /* a type node */
765 case tcc_statement: /* an expression with side effects */
769 case tcc_reference: /* a reference */
773 case tcc_expression: /* an expression */
774 case tcc_comparison: /* a comparison expression */
775 case tcc_unary: /* a unary arithmetic expression */
776 case tcc_binary: /* a binary arithmetic expression */
780 case tcc_constant: /* a constant */
784 case tcc_exceptional: /* something random, like an identifier. */
787 case IDENTIFIER_NODE:
800 kind = ssa_name_kind;
812 kind = omp_clause_kind;
829 tree_code_counts[(int) code]++;
830 tree_node_counts[(int) kind]++;
831 tree_node_sizes[(int) kind] += length;
835 /* Allocate and return a new UID from the DECL_UID namespace. */
838 allocate_decl_uid (void)
840 return next_decl_uid++;
843 /* Return a newly allocated node of code CODE. For decl and type
844 nodes, some other fields are initialized. The rest of the node is
845 initialized to zero. This function cannot be used for TREE_VEC or
846 OMP_CLAUSE nodes, which is enforced by asserts in tree_code_size.
848 Achoo! I got a code in the node. */
851 make_node_stat (enum tree_code code MEM_STAT_DECL)
854 enum tree_code_class type = TREE_CODE_CLASS (code);
855 size_t length = tree_code_size (code);
857 record_node_allocation_statistics (code, length);
859 t = ggc_alloc_zone_cleared_tree_node_stat (
860 (code == IDENTIFIER_NODE) ? &tree_id_zone : &tree_zone,
861 length PASS_MEM_STAT);
862 TREE_SET_CODE (t, code);
867 TREE_SIDE_EFFECTS (t) = 1;
870 case tcc_declaration:
871 if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
873 if (code == FUNCTION_DECL)
875 DECL_ALIGN (t) = FUNCTION_BOUNDARY;
876 DECL_MODE (t) = FUNCTION_MODE;
881 DECL_SOURCE_LOCATION (t) = input_location;
882 if (TREE_CODE (t) == DEBUG_EXPR_DECL)
883 DECL_UID (t) = --next_debug_decl_uid;
886 DECL_UID (t) = allocate_decl_uid ();
887 SET_DECL_PT_UID (t, -1);
889 if (TREE_CODE (t) == LABEL_DECL)
890 LABEL_DECL_UID (t) = -1;
895 TYPE_UID (t) = next_type_uid++;
896 TYPE_ALIGN (t) = BITS_PER_UNIT;
897 TYPE_USER_ALIGN (t) = 0;
898 TYPE_MAIN_VARIANT (t) = t;
899 TYPE_CANONICAL (t) = t;
901 /* Default to no attributes for type, but let target change that. */
902 TYPE_ATTRIBUTES (t) = NULL_TREE;
903 targetm.set_default_type_attributes (t);
905 /* We have not yet computed the alias set for this type. */
906 TYPE_ALIAS_SET (t) = -1;
910 TREE_CONSTANT (t) = 1;
919 case PREDECREMENT_EXPR:
920 case PREINCREMENT_EXPR:
921 case POSTDECREMENT_EXPR:
922 case POSTINCREMENT_EXPR:
923 /* All of these have side-effects, no matter what their
925 TREE_SIDE_EFFECTS (t) = 1;
934 /* Other classes need no special treatment. */
941 /* Return a new node with the same contents as NODE except that its
942 TREE_CHAIN, if it has one, is zero and it has a fresh uid. */
945 copy_node_stat (tree node MEM_STAT_DECL)
948 enum tree_code code = TREE_CODE (node);
951 gcc_assert (code != STATEMENT_LIST);
953 length = tree_size (node);
954 record_node_allocation_statistics (code, length);
955 t = ggc_alloc_zone_tree_node_stat (&tree_zone, length PASS_MEM_STAT);
956 memcpy (t, node, length);
958 if (CODE_CONTAINS_STRUCT (code, TS_COMMON))
960 TREE_ASM_WRITTEN (t) = 0;
961 TREE_VISITED (t) = 0;
962 if (code == VAR_DECL || code == PARM_DECL || code == RESULT_DECL)
963 *DECL_VAR_ANN_PTR (t) = 0;
965 if (TREE_CODE_CLASS (code) == tcc_declaration)
967 if (code == DEBUG_EXPR_DECL)
968 DECL_UID (t) = --next_debug_decl_uid;
971 DECL_UID (t) = allocate_decl_uid ();
972 if (DECL_PT_UID_SET_P (node))
973 SET_DECL_PT_UID (t, DECL_PT_UID (node));
975 if ((TREE_CODE (node) == PARM_DECL || TREE_CODE (node) == VAR_DECL)
976 && DECL_HAS_VALUE_EXPR_P (node))
978 SET_DECL_VALUE_EXPR (t, DECL_VALUE_EXPR (node));
979 DECL_HAS_VALUE_EXPR_P (t) = 1;
981 if (TREE_CODE (node) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (node))
983 SET_DECL_INIT_PRIORITY (t, DECL_INIT_PRIORITY (node));
984 DECL_HAS_INIT_PRIORITY_P (t) = 1;
987 else if (TREE_CODE_CLASS (code) == tcc_type)
989 TYPE_UID (t) = next_type_uid++;
990 /* The following is so that the debug code for
991 the copy is different from the original type.
992 The two statements usually duplicate each other
993 (because they clear fields of the same union),
994 but the optimizer should catch that. */
995 TYPE_SYMTAB_POINTER (t) = 0;
996 TYPE_SYMTAB_ADDRESS (t) = 0;
998 /* Do not copy the values cache. */
999 if (TYPE_CACHED_VALUES_P(t))
1001 TYPE_CACHED_VALUES_P (t) = 0;
1002 TYPE_CACHED_VALUES (t) = NULL_TREE;
1009 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
1010 For example, this can copy a list made of TREE_LIST nodes. */
1013 copy_list (tree list)
1021 head = prev = copy_node (list);
1022 next = TREE_CHAIN (list);
1025 TREE_CHAIN (prev) = copy_node (next);
1026 prev = TREE_CHAIN (prev);
1027 next = TREE_CHAIN (next);
1033 /* Create an INT_CST node with a LOW value sign extended to TYPE. */
1036 build_int_cst (tree type, HOST_WIDE_INT low)
1038 /* Support legacy code. */
1040 type = integer_type_node;
1042 return double_int_to_tree (type, shwi_to_double_int (low));
1045 /* Create an INT_CST node with a LOW value sign extended to TYPE. */
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 gcc_assert (hi == 0 && low == 0);
1182 case REFERENCE_TYPE:
1183 /* Cache NULL pointer. */
1192 /* Cache false or true. */
1200 if (TYPE_UNSIGNED (type))
1203 limit = INTEGER_SHARE_LIMIT;
1204 if (!hi && low < (unsigned HOST_WIDE_INT)INTEGER_SHARE_LIMIT)
1210 limit = INTEGER_SHARE_LIMIT + 1;
1211 if (!hi && low < (unsigned HOST_WIDE_INT)INTEGER_SHARE_LIMIT)
1213 else if (hi == -1 && low == -(unsigned HOST_WIDE_INT)1)
1227 /* Look for it in the type's vector of small shared ints. */
1228 if (!TYPE_CACHED_VALUES_P (type))
1230 TYPE_CACHED_VALUES_P (type) = 1;
1231 TYPE_CACHED_VALUES (type) = make_tree_vec (limit);
1234 t = TREE_VEC_ELT (TYPE_CACHED_VALUES (type), ix);
1237 /* Make sure no one is clobbering the shared constant. */
1238 gcc_assert (TREE_TYPE (t) == type);
1239 gcc_assert (TREE_INT_CST_LOW (t) == low);
1240 gcc_assert (TREE_INT_CST_HIGH (t) == hi);
1244 /* Create a new shared int. */
1245 t = make_node (INTEGER_CST);
1247 TREE_INT_CST_LOW (t) = low;
1248 TREE_INT_CST_HIGH (t) = hi;
1249 TREE_TYPE (t) = type;
1251 TREE_VEC_ELT (TYPE_CACHED_VALUES (type), ix) = t;
1256 /* Use the cache of larger shared ints. */
1259 TREE_INT_CST_LOW (int_cst_node) = low;
1260 TREE_INT_CST_HIGH (int_cst_node) = hi;
1261 TREE_TYPE (int_cst_node) = type;
1263 slot = htab_find_slot (int_cst_hash_table, int_cst_node, INSERT);
1267 /* Insert this one into the hash table. */
1270 /* Make a new node for next time round. */
1271 int_cst_node = make_node (INTEGER_CST);
1278 /* Builds an integer constant in TYPE such that lowest BITS bits are ones
1279 and the rest are zeros. */
1282 build_low_bits_mask (tree type, unsigned bits)
1286 gcc_assert (bits <= TYPE_PRECISION (type));
1288 if (bits == TYPE_PRECISION (type)
1289 && !TYPE_UNSIGNED (type))
1290 /* Sign extended all-ones mask. */
1291 mask = double_int_minus_one;
1293 mask = double_int_mask (bits);
1295 return build_int_cst_wide (type, mask.low, mask.high);
1298 /* Checks that X is integer constant that can be expressed in (unsigned)
1299 HOST_WIDE_INT without loss of precision. */
1302 cst_and_fits_in_hwi (const_tree x)
1304 if (TREE_CODE (x) != INTEGER_CST)
1307 if (TYPE_PRECISION (TREE_TYPE (x)) > HOST_BITS_PER_WIDE_INT)
1310 return (TREE_INT_CST_HIGH (x) == 0
1311 || TREE_INT_CST_HIGH (x) == -1);
1314 /* Return a new VECTOR_CST node whose type is TYPE and whose values
1315 are in a list pointed to by VALS. */
1318 build_vector (tree type, tree vals)
1320 tree v = make_node (VECTOR_CST);
1325 TREE_VECTOR_CST_ELTS (v) = vals;
1326 TREE_TYPE (v) = type;
1328 /* Iterate through elements and check for overflow. */
1329 for (link = vals; link; link = TREE_CHAIN (link))
1331 tree value = TREE_VALUE (link);
1334 /* Don't crash if we get an address constant. */
1335 if (!CONSTANT_CLASS_P (value))
1338 over |= TREE_OVERFLOW (value);
1341 gcc_assert (cnt == TYPE_VECTOR_SUBPARTS (type));
1343 TREE_OVERFLOW (v) = over;
1347 /* Return a new VECTOR_CST node whose type is TYPE and whose values
1348 are extracted from V, a vector of CONSTRUCTOR_ELT. */
1351 build_vector_from_ctor (tree type, VEC(constructor_elt,gc) *v)
1353 tree list = NULL_TREE;
1354 unsigned HOST_WIDE_INT idx;
1357 FOR_EACH_CONSTRUCTOR_VALUE (v, idx, value)
1358 list = tree_cons (NULL_TREE, value, list);
1359 for (; idx < TYPE_VECTOR_SUBPARTS (type); ++idx)
1360 list = tree_cons (NULL_TREE,
1361 build_zero_cst (TREE_TYPE (type)), list);
1362 return build_vector (type, nreverse (list));
1365 /* Build a vector of type VECTYPE where all the elements are SCs. */
1367 build_vector_from_val (tree vectype, tree sc)
1369 int i, nunits = TYPE_VECTOR_SUBPARTS (vectype);
1370 VEC(constructor_elt, gc) *v = NULL;
1372 if (sc == error_mark_node)
1375 /* Verify that the vector type is suitable for SC. Note that there
1376 is some inconsistency in the type-system with respect to restrict
1377 qualifications of pointers. Vector types always have a main-variant
1378 element type and the qualification is applied to the vector-type.
1379 So TREE_TYPE (vector-type) does not return a properly qualified
1380 vector element-type. */
1381 gcc_checking_assert (types_compatible_p (TYPE_MAIN_VARIANT (TREE_TYPE (sc)),
1382 TREE_TYPE (vectype)));
1384 v = VEC_alloc (constructor_elt, gc, nunits);
1385 for (i = 0; i < nunits; ++i)
1386 CONSTRUCTOR_APPEND_ELT (v, NULL_TREE, sc);
1388 if (CONSTANT_CLASS_P (sc))
1389 return build_vector_from_ctor (vectype, v);
1391 return build_constructor (vectype, v);
1394 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
1395 are in the VEC pointed to by VALS. */
1397 build_constructor (tree type, VEC(constructor_elt,gc) *vals)
1399 tree c = make_node (CONSTRUCTOR);
1401 constructor_elt *elt;
1402 bool constant_p = true;
1404 TREE_TYPE (c) = type;
1405 CONSTRUCTOR_ELTS (c) = vals;
1407 FOR_EACH_VEC_ELT (constructor_elt, vals, i, elt)
1408 if (!TREE_CONSTANT (elt->value))
1414 TREE_CONSTANT (c) = constant_p;
1419 /* Build a CONSTRUCTOR node made of a single initializer, with the specified
1422 build_constructor_single (tree type, tree index, tree value)
1424 VEC(constructor_elt,gc) *v;
1425 constructor_elt *elt;
1427 v = VEC_alloc (constructor_elt, gc, 1);
1428 elt = VEC_quick_push (constructor_elt, v, NULL);
1432 return build_constructor (type, v);
1436 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
1437 are in a list pointed to by VALS. */
1439 build_constructor_from_list (tree type, tree vals)
1442 VEC(constructor_elt,gc) *v = NULL;
1446 v = VEC_alloc (constructor_elt, gc, list_length (vals));
1447 for (t = vals; t; t = TREE_CHAIN (t))
1448 CONSTRUCTOR_APPEND_ELT (v, TREE_PURPOSE (t), TREE_VALUE (t));
1451 return build_constructor (type, v);
1454 /* Return a new FIXED_CST node whose type is TYPE and value is F. */
1457 build_fixed (tree type, FIXED_VALUE_TYPE f)
1460 FIXED_VALUE_TYPE *fp;
1462 v = make_node (FIXED_CST);
1463 fp = ggc_alloc_fixed_value ();
1464 memcpy (fp, &f, sizeof (FIXED_VALUE_TYPE));
1466 TREE_TYPE (v) = type;
1467 TREE_FIXED_CST_PTR (v) = fp;
1471 /* Return a new REAL_CST node whose type is TYPE and value is D. */
1474 build_real (tree type, REAL_VALUE_TYPE d)
1477 REAL_VALUE_TYPE *dp;
1480 /* ??? Used to check for overflow here via CHECK_FLOAT_TYPE.
1481 Consider doing it via real_convert now. */
1483 v = make_node (REAL_CST);
1484 dp = ggc_alloc_real_value ();
1485 memcpy (dp, &d, sizeof (REAL_VALUE_TYPE));
1487 TREE_TYPE (v) = type;
1488 TREE_REAL_CST_PTR (v) = dp;
1489 TREE_OVERFLOW (v) = overflow;
1493 /* Return a new REAL_CST node whose type is TYPE
1494 and whose value is the integer value of the INTEGER_CST node I. */
1497 real_value_from_int_cst (const_tree type, const_tree i)
1501 /* Clear all bits of the real value type so that we can later do
1502 bitwise comparisons to see if two values are the same. */
1503 memset (&d, 0, sizeof d);
1505 real_from_integer (&d, type ? TYPE_MODE (type) : VOIDmode,
1506 TREE_INT_CST_LOW (i), TREE_INT_CST_HIGH (i),
1507 TYPE_UNSIGNED (TREE_TYPE (i)));
1511 /* Given a tree representing an integer constant I, return a tree
1512 representing the same value as a floating-point constant of type TYPE. */
1515 build_real_from_int_cst (tree type, const_tree i)
1518 int overflow = TREE_OVERFLOW (i);
1520 v = build_real (type, real_value_from_int_cst (type, i));
1522 TREE_OVERFLOW (v) |= overflow;
1526 /* Return a newly constructed STRING_CST node whose value is
1527 the LEN characters at STR.
1528 Note that for a C string literal, LEN should include the trailing NUL.
1529 The TREE_TYPE is not initialized. */
1532 build_string (int len, const char *str)
1537 /* Do not waste bytes provided by padding of struct tree_string. */
1538 length = len + offsetof (struct tree_string, str) + 1;
1540 record_node_allocation_statistics (STRING_CST, length);
1542 s = ggc_alloc_tree_node (length);
1544 memset (s, 0, sizeof (struct tree_typed));
1545 TREE_SET_CODE (s, STRING_CST);
1546 TREE_CONSTANT (s) = 1;
1547 TREE_STRING_LENGTH (s) = len;
1548 memcpy (s->string.str, str, len);
1549 s->string.str[len] = '\0';
1554 /* Return a newly constructed COMPLEX_CST node whose value is
1555 specified by the real and imaginary parts REAL and IMAG.
1556 Both REAL and IMAG should be constant nodes. TYPE, if specified,
1557 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
1560 build_complex (tree type, tree real, tree imag)
1562 tree t = make_node (COMPLEX_CST);
1564 TREE_REALPART (t) = real;
1565 TREE_IMAGPART (t) = imag;
1566 TREE_TYPE (t) = type ? type : build_complex_type (TREE_TYPE (real));
1567 TREE_OVERFLOW (t) = TREE_OVERFLOW (real) | TREE_OVERFLOW (imag);
1571 /* Return a constant of arithmetic type TYPE which is the
1572 multiplicative identity of the set TYPE. */
1575 build_one_cst (tree type)
1577 switch (TREE_CODE (type))
1579 case INTEGER_TYPE: case ENUMERAL_TYPE: case BOOLEAN_TYPE:
1580 case POINTER_TYPE: case REFERENCE_TYPE:
1582 return build_int_cst (type, 1);
1585 return build_real (type, dconst1);
1587 case FIXED_POINT_TYPE:
1588 /* We can only generate 1 for accum types. */
1589 gcc_assert (ALL_SCALAR_ACCUM_MODE_P (TYPE_MODE (type)));
1590 return build_fixed (type, FCONST1(TYPE_MODE (type)));
1594 tree scalar = build_one_cst (TREE_TYPE (type));
1596 return build_vector_from_val (type, scalar);
1600 return build_complex (type,
1601 build_one_cst (TREE_TYPE (type)),
1602 build_zero_cst (TREE_TYPE (type)));
1609 /* Build 0 constant of type TYPE. This is used by constructor folding
1610 and thus the constant should be represented in memory by
1614 build_zero_cst (tree type)
1616 switch (TREE_CODE (type))
1618 case INTEGER_TYPE: case ENUMERAL_TYPE: case BOOLEAN_TYPE:
1619 case POINTER_TYPE: case REFERENCE_TYPE:
1621 return build_int_cst (type, 0);
1624 return build_real (type, dconst0);
1626 case FIXED_POINT_TYPE:
1627 return build_fixed (type, FCONST0 (TYPE_MODE (type)));
1631 tree scalar = build_zero_cst (TREE_TYPE (type));
1633 return build_vector_from_val (type, scalar);
1638 tree zero = build_zero_cst (TREE_TYPE (type));
1640 return build_complex (type, zero, zero);
1644 if (!AGGREGATE_TYPE_P (type))
1645 return fold_convert (type, integer_zero_node);
1646 return build_constructor (type, NULL);
1651 /* Build a BINFO with LEN language slots. */
1654 make_tree_binfo_stat (unsigned base_binfos MEM_STAT_DECL)
1657 size_t length = (offsetof (struct tree_binfo, base_binfos)
1658 + VEC_embedded_size (tree, base_binfos));
1660 record_node_allocation_statistics (TREE_BINFO, length);
1662 t = ggc_alloc_zone_tree_node_stat (&tree_zone, length PASS_MEM_STAT);
1664 memset (t, 0, offsetof (struct tree_binfo, base_binfos));
1666 TREE_SET_CODE (t, TREE_BINFO);
1668 VEC_embedded_init (tree, BINFO_BASE_BINFOS (t), base_binfos);
1673 /* Create a CASE_LABEL_EXPR tree node and return it. */
1676 build_case_label (tree low_value, tree high_value, tree label_decl)
1678 tree t = make_node (CASE_LABEL_EXPR);
1680 TREE_TYPE (t) = void_type_node;
1681 SET_EXPR_LOCATION (t, DECL_SOURCE_LOCATION (label_decl));
1683 CASE_LOW (t) = low_value;
1684 CASE_HIGH (t) = high_value;
1685 CASE_LABEL (t) = label_decl;
1686 CASE_CHAIN (t) = NULL_TREE;
1691 /* Build a newly constructed TREE_VEC node of length LEN. */
1694 make_tree_vec_stat (int len MEM_STAT_DECL)
1697 int length = (len - 1) * sizeof (tree) + sizeof (struct tree_vec);
1699 record_node_allocation_statistics (TREE_VEC, length);
1701 t = ggc_alloc_zone_cleared_tree_node_stat (&tree_zone, length PASS_MEM_STAT);
1703 TREE_SET_CODE (t, TREE_VEC);
1704 TREE_VEC_LENGTH (t) = len;
1709 /* Return 1 if EXPR is the integer constant zero or a complex constant
1713 integer_zerop (const_tree expr)
1717 return ((TREE_CODE (expr) == INTEGER_CST
1718 && TREE_INT_CST_LOW (expr) == 0
1719 && TREE_INT_CST_HIGH (expr) == 0)
1720 || (TREE_CODE (expr) == COMPLEX_CST
1721 && integer_zerop (TREE_REALPART (expr))
1722 && integer_zerop (TREE_IMAGPART (expr))));
1725 /* Return 1 if EXPR is the integer constant one or the corresponding
1726 complex constant. */
1729 integer_onep (const_tree expr)
1733 return ((TREE_CODE (expr) == INTEGER_CST
1734 && TREE_INT_CST_LOW (expr) == 1
1735 && TREE_INT_CST_HIGH (expr) == 0)
1736 || (TREE_CODE (expr) == COMPLEX_CST
1737 && integer_onep (TREE_REALPART (expr))
1738 && integer_zerop (TREE_IMAGPART (expr))));
1741 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
1742 it contains. Likewise for the corresponding complex constant. */
1745 integer_all_onesp (const_tree expr)
1752 if (TREE_CODE (expr) == COMPLEX_CST
1753 && integer_all_onesp (TREE_REALPART (expr))
1754 && integer_zerop (TREE_IMAGPART (expr)))
1757 else if (TREE_CODE (expr) != INTEGER_CST)
1760 uns = TYPE_UNSIGNED (TREE_TYPE (expr));
1761 if (TREE_INT_CST_LOW (expr) == ~(unsigned HOST_WIDE_INT) 0
1762 && TREE_INT_CST_HIGH (expr) == -1)
1767 prec = TYPE_PRECISION (TREE_TYPE (expr));
1768 if (prec >= HOST_BITS_PER_WIDE_INT)
1770 HOST_WIDE_INT high_value;
1773 shift_amount = prec - HOST_BITS_PER_WIDE_INT;
1775 /* Can not handle precisions greater than twice the host int size. */
1776 gcc_assert (shift_amount <= HOST_BITS_PER_WIDE_INT);
1777 if (shift_amount == HOST_BITS_PER_WIDE_INT)
1778 /* Shifting by the host word size is undefined according to the ANSI
1779 standard, so we must handle this as a special case. */
1782 high_value = ((HOST_WIDE_INT) 1 << shift_amount) - 1;
1784 return (TREE_INT_CST_LOW (expr) == ~(unsigned HOST_WIDE_INT) 0
1785 && TREE_INT_CST_HIGH (expr) == high_value);
1788 return TREE_INT_CST_LOW (expr) == ((unsigned HOST_WIDE_INT) 1 << prec) - 1;
1791 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
1795 integer_pow2p (const_tree expr)
1798 HOST_WIDE_INT high, low;
1802 if (TREE_CODE (expr) == COMPLEX_CST
1803 && integer_pow2p (TREE_REALPART (expr))
1804 && integer_zerop (TREE_IMAGPART (expr)))
1807 if (TREE_CODE (expr) != INTEGER_CST)
1810 prec = TYPE_PRECISION (TREE_TYPE (expr));
1811 high = TREE_INT_CST_HIGH (expr);
1812 low = TREE_INT_CST_LOW (expr);
1814 /* First clear all bits that are beyond the type's precision in case
1815 we've been sign extended. */
1817 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
1819 else if (prec > HOST_BITS_PER_WIDE_INT)
1820 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
1824 if (prec < HOST_BITS_PER_WIDE_INT)
1825 low &= ~((HOST_WIDE_INT) (-1) << prec);
1828 if (high == 0 && low == 0)
1831 return ((high == 0 && (low & (low - 1)) == 0)
1832 || (low == 0 && (high & (high - 1)) == 0));
1835 /* Return 1 if EXPR is an integer constant other than zero or a
1836 complex constant other than zero. */
1839 integer_nonzerop (const_tree expr)
1843 return ((TREE_CODE (expr) == INTEGER_CST
1844 && (TREE_INT_CST_LOW (expr) != 0
1845 || TREE_INT_CST_HIGH (expr) != 0))
1846 || (TREE_CODE (expr) == COMPLEX_CST
1847 && (integer_nonzerop (TREE_REALPART (expr))
1848 || integer_nonzerop (TREE_IMAGPART (expr)))));
1851 /* Return 1 if EXPR is the fixed-point constant zero. */
1854 fixed_zerop (const_tree expr)
1856 return (TREE_CODE (expr) == FIXED_CST
1857 && double_int_zero_p (TREE_FIXED_CST (expr).data));
1860 /* Return the power of two represented by a tree node known to be a
1864 tree_log2 (const_tree expr)
1867 HOST_WIDE_INT high, low;
1871 if (TREE_CODE (expr) == COMPLEX_CST)
1872 return tree_log2 (TREE_REALPART (expr));
1874 prec = TYPE_PRECISION (TREE_TYPE (expr));
1875 high = TREE_INT_CST_HIGH (expr);
1876 low = TREE_INT_CST_LOW (expr);
1878 /* First clear all bits that are beyond the type's precision in case
1879 we've been sign extended. */
1881 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
1883 else if (prec > HOST_BITS_PER_WIDE_INT)
1884 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
1888 if (prec < HOST_BITS_PER_WIDE_INT)
1889 low &= ~((HOST_WIDE_INT) (-1) << prec);
1892 return (high != 0 ? HOST_BITS_PER_WIDE_INT + exact_log2 (high)
1893 : exact_log2 (low));
1896 /* Similar, but return the largest integer Y such that 2 ** Y is less
1897 than or equal to EXPR. */
1900 tree_floor_log2 (const_tree expr)
1903 HOST_WIDE_INT high, low;
1907 if (TREE_CODE (expr) == COMPLEX_CST)
1908 return tree_log2 (TREE_REALPART (expr));
1910 prec = TYPE_PRECISION (TREE_TYPE (expr));
1911 high = TREE_INT_CST_HIGH (expr);
1912 low = TREE_INT_CST_LOW (expr);
1914 /* First clear all bits that are beyond the type's precision in case
1915 we've been sign extended. Ignore if type's precision hasn't been set
1916 since what we are doing is setting it. */
1918 if (prec == 2 * HOST_BITS_PER_WIDE_INT || prec == 0)
1920 else if (prec > HOST_BITS_PER_WIDE_INT)
1921 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
1925 if (prec < HOST_BITS_PER_WIDE_INT)
1926 low &= ~((HOST_WIDE_INT) (-1) << prec);
1929 return (high != 0 ? HOST_BITS_PER_WIDE_INT + floor_log2 (high)
1930 : floor_log2 (low));
1933 /* Return 1 if EXPR is the real constant zero. Trailing zeroes matter for
1934 decimal float constants, so don't return 1 for them. */
1937 real_zerop (const_tree expr)
1941 return ((TREE_CODE (expr) == REAL_CST
1942 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst0)
1943 && !(DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (expr)))))
1944 || (TREE_CODE (expr) == COMPLEX_CST
1945 && real_zerop (TREE_REALPART (expr))
1946 && real_zerop (TREE_IMAGPART (expr))));
1949 /* Return 1 if EXPR is the real constant one in real or complex form.
1950 Trailing zeroes matter for decimal float constants, so don't return
1954 real_onep (const_tree expr)
1958 return ((TREE_CODE (expr) == REAL_CST
1959 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst1)
1960 && !(DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (expr)))))
1961 || (TREE_CODE (expr) == COMPLEX_CST
1962 && real_onep (TREE_REALPART (expr))
1963 && real_zerop (TREE_IMAGPART (expr))));
1966 /* Return 1 if EXPR is the real constant two. Trailing zeroes matter
1967 for decimal float constants, so don't return 1 for them. */
1970 real_twop (const_tree expr)
1974 return ((TREE_CODE (expr) == REAL_CST
1975 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst2)
1976 && !(DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (expr)))))
1977 || (TREE_CODE (expr) == COMPLEX_CST
1978 && real_twop (TREE_REALPART (expr))
1979 && real_zerop (TREE_IMAGPART (expr))));
1982 /* Return 1 if EXPR is the real constant minus one. Trailing zeroes
1983 matter for decimal float constants, so don't return 1 for them. */
1986 real_minus_onep (const_tree expr)
1990 return ((TREE_CODE (expr) == REAL_CST
1991 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconstm1)
1992 && !(DECIMAL_FLOAT_MODE_P (TYPE_MODE (TREE_TYPE (expr)))))
1993 || (TREE_CODE (expr) == COMPLEX_CST
1994 && real_minus_onep (TREE_REALPART (expr))
1995 && real_zerop (TREE_IMAGPART (expr))));
1998 /* Nonzero if EXP is a constant or a cast of a constant. */
2001 really_constant_p (const_tree exp)
2003 /* This is not quite the same as STRIP_NOPS. It does more. */
2004 while (CONVERT_EXPR_P (exp)
2005 || TREE_CODE (exp) == NON_LVALUE_EXPR)
2006 exp = TREE_OPERAND (exp, 0);
2007 return TREE_CONSTANT (exp);
2010 /* Return first list element whose TREE_VALUE is ELEM.
2011 Return 0 if ELEM is not in LIST. */
2014 value_member (tree elem, tree list)
2018 if (elem == TREE_VALUE (list))
2020 list = TREE_CHAIN (list);
2025 /* Return first list element whose TREE_PURPOSE is ELEM.
2026 Return 0 if ELEM is not in LIST. */
2029 purpose_member (const_tree elem, tree list)
2033 if (elem == TREE_PURPOSE (list))
2035 list = TREE_CHAIN (list);
2040 /* Return true if ELEM is in V. */
2043 vec_member (const_tree elem, VEC(tree,gc) *v)
2047 FOR_EACH_VEC_ELT (tree, v, ix, t)
2053 /* Returns element number IDX (zero-origin) of chain CHAIN, or
2057 chain_index (int idx, tree chain)
2059 for (; chain && idx > 0; --idx)
2060 chain = TREE_CHAIN (chain);
2064 /* Return nonzero if ELEM is part of the chain CHAIN. */
2067 chain_member (const_tree elem, const_tree chain)
2073 chain = DECL_CHAIN (chain);
2079 /* Return the length of a chain of nodes chained through TREE_CHAIN.
2080 We expect a null pointer to mark the end of the chain.
2081 This is the Lisp primitive `length'. */
2084 list_length (const_tree t)
2087 #ifdef ENABLE_TREE_CHECKING
2095 #ifdef ENABLE_TREE_CHECKING
2098 gcc_assert (p != q);
2106 /* Returns the number of FIELD_DECLs in TYPE. */
2109 fields_length (const_tree type)
2111 tree t = TYPE_FIELDS (type);
2114 for (; t; t = DECL_CHAIN (t))
2115 if (TREE_CODE (t) == FIELD_DECL)
2121 /* Returns the first FIELD_DECL in the TYPE_FIELDS of the RECORD_TYPE or
2122 UNION_TYPE TYPE, or NULL_TREE if none. */
2125 first_field (const_tree type)
2127 tree t = TYPE_FIELDS (type);
2128 while (t && TREE_CODE (t) != FIELD_DECL)
2133 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
2134 by modifying the last node in chain 1 to point to chain 2.
2135 This is the Lisp primitive `nconc'. */
2138 chainon (tree op1, tree op2)
2147 for (t1 = op1; TREE_CHAIN (t1); t1 = TREE_CHAIN (t1))
2149 TREE_CHAIN (t1) = op2;
2151 #ifdef ENABLE_TREE_CHECKING
2154 for (t2 = op2; t2; t2 = TREE_CHAIN (t2))
2155 gcc_assert (t2 != t1);
2162 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
2165 tree_last (tree chain)
2169 while ((next = TREE_CHAIN (chain)))
2174 /* Reverse the order of elements in the chain T,
2175 and return the new head of the chain (old last element). */
2180 tree prev = 0, decl, next;
2181 for (decl = t; decl; decl = next)
2183 /* We shouldn't be using this function to reverse BLOCK chains; we
2184 have blocks_nreverse for that. */
2185 gcc_checking_assert (TREE_CODE (decl) != BLOCK);
2186 next = TREE_CHAIN (decl);
2187 TREE_CHAIN (decl) = prev;
2193 /* Return a newly created TREE_LIST node whose
2194 purpose and value fields are PARM and VALUE. */
2197 build_tree_list_stat (tree parm, tree value MEM_STAT_DECL)
2199 tree t = make_node_stat (TREE_LIST PASS_MEM_STAT);
2200 TREE_PURPOSE (t) = parm;
2201 TREE_VALUE (t) = value;
2205 /* Build a chain of TREE_LIST nodes from a vector. */
2208 build_tree_list_vec_stat (const VEC(tree,gc) *vec MEM_STAT_DECL)
2210 tree ret = NULL_TREE;
2214 FOR_EACH_VEC_ELT (tree, vec, i, t)
2216 *pp = build_tree_list_stat (NULL, t PASS_MEM_STAT);
2217 pp = &TREE_CHAIN (*pp);
2222 /* Return a newly created TREE_LIST node whose
2223 purpose and value fields are PURPOSE and VALUE
2224 and whose TREE_CHAIN is CHAIN. */
2227 tree_cons_stat (tree purpose, tree value, tree chain MEM_STAT_DECL)
2231 node = ggc_alloc_zone_tree_node_stat (&tree_zone, sizeof (struct tree_list)
2233 memset (node, 0, sizeof (struct tree_common));
2235 record_node_allocation_statistics (TREE_LIST, sizeof (struct tree_list));
2237 TREE_SET_CODE (node, TREE_LIST);
2238 TREE_CHAIN (node) = chain;
2239 TREE_PURPOSE (node) = purpose;
2240 TREE_VALUE (node) = value;
2244 /* Return the values of the elements of a CONSTRUCTOR as a vector of
2248 ctor_to_vec (tree ctor)
2250 VEC(tree, gc) *vec = VEC_alloc (tree, gc, CONSTRUCTOR_NELTS (ctor));
2254 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (ctor), ix, val)
2255 VEC_quick_push (tree, vec, val);
2260 /* Return the size nominally occupied by an object of type TYPE
2261 when it resides in memory. The value is measured in units of bytes,
2262 and its data type is that normally used for type sizes
2263 (which is the first type created by make_signed_type or
2264 make_unsigned_type). */
2267 size_in_bytes (const_tree type)
2271 if (type == error_mark_node)
2272 return integer_zero_node;
2274 type = TYPE_MAIN_VARIANT (type);
2275 t = TYPE_SIZE_UNIT (type);
2279 lang_hooks.types.incomplete_type_error (NULL_TREE, type);
2280 return size_zero_node;
2286 /* Return the size of TYPE (in bytes) as a wide integer
2287 or return -1 if the size can vary or is larger than an integer. */
2290 int_size_in_bytes (const_tree type)
2294 if (type == error_mark_node)
2297 type = TYPE_MAIN_VARIANT (type);
2298 t = TYPE_SIZE_UNIT (type);
2300 || TREE_CODE (t) != INTEGER_CST
2301 || TREE_INT_CST_HIGH (t) != 0
2302 /* If the result would appear negative, it's too big to represent. */
2303 || (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0)
2306 return TREE_INT_CST_LOW (t);
2309 /* Return the maximum size of TYPE (in bytes) as a wide integer
2310 or return -1 if the size can vary or is larger than an integer. */
2313 max_int_size_in_bytes (const_tree type)
2315 HOST_WIDE_INT size = -1;
2318 /* If this is an array type, check for a possible MAX_SIZE attached. */
2320 if (TREE_CODE (type) == ARRAY_TYPE)
2322 size_tree = TYPE_ARRAY_MAX_SIZE (type);
2324 if (size_tree && host_integerp (size_tree, 1))
2325 size = tree_low_cst (size_tree, 1);
2328 /* If we still haven't been able to get a size, see if the language
2329 can compute a maximum size. */
2333 size_tree = lang_hooks.types.max_size (type);
2335 if (size_tree && host_integerp (size_tree, 1))
2336 size = tree_low_cst (size_tree, 1);
2342 /* Returns a tree for the size of EXP in bytes. */
2345 tree_expr_size (const_tree exp)
2348 && DECL_SIZE_UNIT (exp) != 0)
2349 return DECL_SIZE_UNIT (exp);
2351 return size_in_bytes (TREE_TYPE (exp));
2354 /* Return the bit position of FIELD, in bits from the start of the record.
2355 This is a tree of type bitsizetype. */
2358 bit_position (const_tree field)
2360 return bit_from_pos (DECL_FIELD_OFFSET (field),
2361 DECL_FIELD_BIT_OFFSET (field));
2364 /* Likewise, but return as an integer. It must be representable in
2365 that way (since it could be a signed value, we don't have the
2366 option of returning -1 like int_size_in_byte can. */
2369 int_bit_position (const_tree field)
2371 return tree_low_cst (bit_position (field), 0);
2374 /* Return the byte position of FIELD, in bytes from the start of the record.
2375 This is a tree of type sizetype. */
2378 byte_position (const_tree field)
2380 return byte_from_pos (DECL_FIELD_OFFSET (field),
2381 DECL_FIELD_BIT_OFFSET (field));
2384 /* Likewise, but return as an integer. It must be representable in
2385 that way (since it could be a signed value, we don't have the
2386 option of returning -1 like int_size_in_byte can. */
2389 int_byte_position (const_tree field)
2391 return tree_low_cst (byte_position (field), 0);
2394 /* Return the strictest alignment, in bits, that T is known to have. */
2397 expr_align (const_tree t)
2399 unsigned int align0, align1;
2401 switch (TREE_CODE (t))
2403 CASE_CONVERT: case NON_LVALUE_EXPR:
2404 /* If we have conversions, we know that the alignment of the
2405 object must meet each of the alignments of the types. */
2406 align0 = expr_align (TREE_OPERAND (t, 0));
2407 align1 = TYPE_ALIGN (TREE_TYPE (t));
2408 return MAX (align0, align1);
2410 case SAVE_EXPR: case COMPOUND_EXPR: case MODIFY_EXPR:
2411 case INIT_EXPR: case TARGET_EXPR: case WITH_CLEANUP_EXPR:
2412 case CLEANUP_POINT_EXPR:
2413 /* These don't change the alignment of an object. */
2414 return expr_align (TREE_OPERAND (t, 0));
2417 /* The best we can do is say that the alignment is the least aligned
2419 align0 = expr_align (TREE_OPERAND (t, 1));
2420 align1 = expr_align (TREE_OPERAND (t, 2));
2421 return MIN (align0, align1);
2423 /* FIXME: LABEL_DECL and CONST_DECL never have DECL_ALIGN set
2424 meaningfully, it's always 1. */
2425 case LABEL_DECL: case CONST_DECL:
2426 case VAR_DECL: case PARM_DECL: case RESULT_DECL:
2428 gcc_assert (DECL_ALIGN (t) != 0);
2429 return DECL_ALIGN (t);
2435 /* Otherwise take the alignment from that of the type. */
2436 return TYPE_ALIGN (TREE_TYPE (t));
2439 /* Return, as a tree node, the number of elements for TYPE (which is an
2440 ARRAY_TYPE) minus one. This counts only elements of the top array. */
2443 array_type_nelts (const_tree type)
2445 tree index_type, min, max;
2447 /* If they did it with unspecified bounds, then we should have already
2448 given an error about it before we got here. */
2449 if (! TYPE_DOMAIN (type))
2450 return error_mark_node;
2452 index_type = TYPE_DOMAIN (type);
2453 min = TYPE_MIN_VALUE (index_type);
2454 max = TYPE_MAX_VALUE (index_type);
2456 /* TYPE_MAX_VALUE may not be set if the array has unknown length. */
2458 return error_mark_node;
2460 return (integer_zerop (min)
2462 : fold_build2 (MINUS_EXPR, TREE_TYPE (max), max, min));
2465 /* If arg is static -- a reference to an object in static storage -- then
2466 return the object. This is not the same as the C meaning of `static'.
2467 If arg isn't static, return NULL. */
2472 switch (TREE_CODE (arg))
2475 /* Nested functions are static, even though taking their address will
2476 involve a trampoline as we unnest the nested function and create
2477 the trampoline on the tree level. */
2481 return ((TREE_STATIC (arg) || DECL_EXTERNAL (arg))
2482 && ! DECL_THREAD_LOCAL_P (arg)
2483 && ! DECL_DLLIMPORT_P (arg)
2487 return ((TREE_STATIC (arg) || DECL_EXTERNAL (arg))
2491 return TREE_STATIC (arg) ? arg : NULL;
2498 /* If the thing being referenced is not a field, then it is
2499 something language specific. */
2500 gcc_assert (TREE_CODE (TREE_OPERAND (arg, 1)) == FIELD_DECL);
2502 /* If we are referencing a bitfield, we can't evaluate an
2503 ADDR_EXPR at compile time and so it isn't a constant. */
2504 if (DECL_BIT_FIELD (TREE_OPERAND (arg, 1)))
2507 return staticp (TREE_OPERAND (arg, 0));
2513 return TREE_CONSTANT (TREE_OPERAND (arg, 0)) ? arg : NULL;
2516 case ARRAY_RANGE_REF:
2517 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg))) == INTEGER_CST
2518 && TREE_CODE (TREE_OPERAND (arg, 1)) == INTEGER_CST)
2519 return staticp (TREE_OPERAND (arg, 0));
2523 case COMPOUND_LITERAL_EXPR:
2524 return TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (arg)) ? arg : NULL;
2534 /* Return whether OP is a DECL whose address is function-invariant. */
2537 decl_address_invariant_p (const_tree op)
2539 /* The conditions below are slightly less strict than the one in
2542 switch (TREE_CODE (op))
2551 if ((TREE_STATIC (op) || DECL_EXTERNAL (op))
2552 || DECL_THREAD_LOCAL_P (op)
2553 || DECL_CONTEXT (op) == current_function_decl
2554 || decl_function_context (op) == current_function_decl)
2559 if ((TREE_STATIC (op) || DECL_EXTERNAL (op))
2560 || decl_function_context (op) == current_function_decl)
2571 /* Return whether OP is a DECL whose address is interprocedural-invariant. */
2574 decl_address_ip_invariant_p (const_tree op)
2576 /* The conditions below are slightly less strict than the one in
2579 switch (TREE_CODE (op))
2587 if (((TREE_STATIC (op) || DECL_EXTERNAL (op))
2588 && !DECL_DLLIMPORT_P (op))
2589 || DECL_THREAD_LOCAL_P (op))
2594 if ((TREE_STATIC (op) || DECL_EXTERNAL (op)))
2606 /* Return true if T is function-invariant (internal function, does
2607 not handle arithmetic; that's handled in skip_simple_arithmetic and
2608 tree_invariant_p). */
2610 static bool tree_invariant_p (tree t);
2613 tree_invariant_p_1 (tree t)
2617 if (TREE_CONSTANT (t)
2618 || (TREE_READONLY (t) && !TREE_SIDE_EFFECTS (t)))
2621 switch (TREE_CODE (t))
2627 op = TREE_OPERAND (t, 0);
2628 while (handled_component_p (op))
2630 switch (TREE_CODE (op))
2633 case ARRAY_RANGE_REF:
2634 if (!tree_invariant_p (TREE_OPERAND (op, 1))
2635 || TREE_OPERAND (op, 2) != NULL_TREE
2636 || TREE_OPERAND (op, 3) != NULL_TREE)
2641 if (TREE_OPERAND (op, 2) != NULL_TREE)
2647 op = TREE_OPERAND (op, 0);
2650 return CONSTANT_CLASS_P (op) || decl_address_invariant_p (op);
2659 /* Return true if T is function-invariant. */
2662 tree_invariant_p (tree t)
2664 tree inner = skip_simple_arithmetic (t);
2665 return tree_invariant_p_1 (inner);
2668 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
2669 Do this to any expression which may be used in more than one place,
2670 but must be evaluated only once.
2672 Normally, expand_expr would reevaluate the expression each time.
2673 Calling save_expr produces something that is evaluated and recorded
2674 the first time expand_expr is called on it. Subsequent calls to
2675 expand_expr just reuse the recorded value.
2677 The call to expand_expr that generates code that actually computes
2678 the value is the first call *at compile time*. Subsequent calls
2679 *at compile time* generate code to use the saved value.
2680 This produces correct result provided that *at run time* control
2681 always flows through the insns made by the first expand_expr
2682 before reaching the other places where the save_expr was evaluated.
2683 You, the caller of save_expr, must make sure this is so.
2685 Constants, and certain read-only nodes, are returned with no
2686 SAVE_EXPR because that is safe. Expressions containing placeholders
2687 are not touched; see tree.def for an explanation of what these
2691 save_expr (tree expr)
2693 tree t = fold (expr);
2696 /* If the tree evaluates to a constant, then we don't want to hide that
2697 fact (i.e. this allows further folding, and direct checks for constants).
2698 However, a read-only object that has side effects cannot be bypassed.
2699 Since it is no problem to reevaluate literals, we just return the
2701 inner = skip_simple_arithmetic (t);
2702 if (TREE_CODE (inner) == ERROR_MARK)
2705 if (tree_invariant_p_1 (inner))
2708 /* If INNER contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
2709 it means that the size or offset of some field of an object depends on
2710 the value within another field.
2712 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
2713 and some variable since it would then need to be both evaluated once and
2714 evaluated more than once. Front-ends must assure this case cannot
2715 happen by surrounding any such subexpressions in their own SAVE_EXPR
2716 and forcing evaluation at the proper time. */
2717 if (contains_placeholder_p (inner))
2720 t = build1 (SAVE_EXPR, TREE_TYPE (expr), t);
2721 SET_EXPR_LOCATION (t, EXPR_LOCATION (expr));
2723 /* This expression might be placed ahead of a jump to ensure that the
2724 value was computed on both sides of the jump. So make sure it isn't
2725 eliminated as dead. */
2726 TREE_SIDE_EFFECTS (t) = 1;
2730 /* Look inside EXPR and into any simple arithmetic operations. Return
2731 the innermost non-arithmetic node. */
2734 skip_simple_arithmetic (tree expr)
2738 /* We don't care about whether this can be used as an lvalue in this
2740 while (TREE_CODE (expr) == NON_LVALUE_EXPR)
2741 expr = TREE_OPERAND (expr, 0);
2743 /* If we have simple operations applied to a SAVE_EXPR or to a SAVE_EXPR and
2744 a constant, it will be more efficient to not make another SAVE_EXPR since
2745 it will allow better simplification and GCSE will be able to merge the
2746 computations if they actually occur. */
2750 if (UNARY_CLASS_P (inner))
2751 inner = TREE_OPERAND (inner, 0);
2752 else if (BINARY_CLASS_P (inner))
2754 if (tree_invariant_p (TREE_OPERAND (inner, 1)))
2755 inner = TREE_OPERAND (inner, 0);
2756 else if (tree_invariant_p (TREE_OPERAND (inner, 0)))
2757 inner = TREE_OPERAND (inner, 1);
2769 /* Return which tree structure is used by T. */
2771 enum tree_node_structure_enum
2772 tree_node_structure (const_tree t)
2774 const enum tree_code code = TREE_CODE (t);
2775 return tree_node_structure_for_code (code);
2778 /* Set various status flags when building a CALL_EXPR object T. */
2781 process_call_operands (tree t)
2783 bool side_effects = TREE_SIDE_EFFECTS (t);
2784 bool read_only = false;
2785 int i = call_expr_flags (t);
2787 /* Calls have side-effects, except those to const or pure functions. */
2788 if ((i & ECF_LOOPING_CONST_OR_PURE) || !(i & (ECF_CONST | ECF_PURE)))
2789 side_effects = true;
2790 /* Propagate TREE_READONLY of arguments for const functions. */
2794 if (!side_effects || read_only)
2795 for (i = 1; i < TREE_OPERAND_LENGTH (t); i++)
2797 tree op = TREE_OPERAND (t, i);
2798 if (op && TREE_SIDE_EFFECTS (op))
2799 side_effects = true;
2800 if (op && !TREE_READONLY (op) && !CONSTANT_CLASS_P (op))
2804 TREE_SIDE_EFFECTS (t) = side_effects;
2805 TREE_READONLY (t) = read_only;
2808 /* Return true if EXP contains a PLACEHOLDER_EXPR, i.e. if it represents a
2809 size or offset that depends on a field within a record. */
2812 contains_placeholder_p (const_tree exp)
2814 enum tree_code code;
2819 code = TREE_CODE (exp);
2820 if (code == PLACEHOLDER_EXPR)
2823 switch (TREE_CODE_CLASS (code))
2826 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
2827 position computations since they will be converted into a
2828 WITH_RECORD_EXPR involving the reference, which will assume
2829 here will be valid. */
2830 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));
2832 case tcc_exceptional:
2833 if (code == TREE_LIST)
2834 return (CONTAINS_PLACEHOLDER_P (TREE_VALUE (exp))
2835 || CONTAINS_PLACEHOLDER_P (TREE_CHAIN (exp)));
2840 case tcc_comparison:
2841 case tcc_expression:
2845 /* Ignoring the first operand isn't quite right, but works best. */
2846 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1));
2849 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0))
2850 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1))
2851 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 2)));
2854 /* The save_expr function never wraps anything containing
2855 a PLACEHOLDER_EXPR. */
2862 switch (TREE_CODE_LENGTH (code))
2865 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));
2867 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0))
2868 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1)));
2879 const_call_expr_arg_iterator iter;
2880 FOR_EACH_CONST_CALL_EXPR_ARG (arg, iter, exp)
2881 if (CONTAINS_PLACEHOLDER_P (arg))
2895 /* Return true if any part of the structure of TYPE involves a PLACEHOLDER_EXPR
2896 directly. This includes size, bounds, qualifiers (for QUAL_UNION_TYPE) and
2900 type_contains_placeholder_1 (const_tree type)
2902 /* If the size contains a placeholder or the parent type (component type in
2903 the case of arrays) type involves a placeholder, this type does. */
2904 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type))
2905 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (type))
2906 || (!POINTER_TYPE_P (type)
2908 && type_contains_placeholder_p (TREE_TYPE (type))))
2911 /* Now do type-specific checks. Note that the last part of the check above
2912 greatly limits what we have to do below. */
2913 switch (TREE_CODE (type))
2921 case REFERENCE_TYPE:
2929 case FIXED_POINT_TYPE:
2930 /* Here we just check the bounds. */
2931 return (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (type))
2932 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (type)));
2935 /* We have already checked the component type above, so just check the
2937 return type_contains_placeholder_p (TYPE_DOMAIN (type));
2941 case QUAL_UNION_TYPE:
2945 for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
2946 if (TREE_CODE (field) == FIELD_DECL
2947 && (CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (field))
2948 || (TREE_CODE (type) == QUAL_UNION_TYPE
2949 && CONTAINS_PLACEHOLDER_P (DECL_QUALIFIER (field)))
2950 || type_contains_placeholder_p (TREE_TYPE (field))))
2961 /* Wrapper around above function used to cache its result. */
2964 type_contains_placeholder_p (tree type)
2968 /* If the contains_placeholder_bits field has been initialized,
2969 then we know the answer. */
2970 if (TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) > 0)
2971 return TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) - 1;
2973 /* Indicate that we've seen this type node, and the answer is false.
2974 This is what we want to return if we run into recursion via fields. */
2975 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) = 1;
2977 /* Compute the real value. */
2978 result = type_contains_placeholder_1 (type);
2980 /* Store the real value. */
2981 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) = result + 1;
2986 /* Push tree EXP onto vector QUEUE if it is not already present. */
2989 push_without_duplicates (tree exp, VEC (tree, heap) **queue)
2994 FOR_EACH_VEC_ELT (tree, *queue, i, iter)
2995 if (simple_cst_equal (iter, exp) == 1)
2999 VEC_safe_push (tree, heap, *queue, exp);
3002 /* Given a tree EXP, find all occurences of references to fields
3003 in a PLACEHOLDER_EXPR and place them in vector REFS without
3004 duplicates. Also record VAR_DECLs and CONST_DECLs. Note that
3005 we assume here that EXP contains only arithmetic expressions
3006 or CALL_EXPRs with PLACEHOLDER_EXPRs occurring only in their
3010 find_placeholder_in_expr (tree exp, VEC (tree, heap) **refs)
3012 enum tree_code code = TREE_CODE (exp);
3016 /* We handle TREE_LIST and COMPONENT_REF separately. */
3017 if (code == TREE_LIST)
3019 FIND_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp), refs);
3020 FIND_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp), refs);
3022 else if (code == COMPONENT_REF)
3024 for (inner = TREE_OPERAND (exp, 0);
3025 REFERENCE_CLASS_P (inner);
3026 inner = TREE_OPERAND (inner, 0))
3029 if (TREE_CODE (inner) == PLACEHOLDER_EXPR)
3030 push_without_duplicates (exp, refs);
3032 FIND_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), refs);
3035 switch (TREE_CODE_CLASS (code))
3040 case tcc_declaration:
3041 /* Variables allocated to static storage can stay. */
3042 if (!TREE_STATIC (exp))
3043 push_without_duplicates (exp, refs);
3046 case tcc_expression:
3047 /* This is the pattern built in ada/make_aligning_type. */
3048 if (code == ADDR_EXPR
3049 && TREE_CODE (TREE_OPERAND (exp, 0)) == PLACEHOLDER_EXPR)
3051 push_without_duplicates (exp, refs);
3055 /* Fall through... */
3057 case tcc_exceptional:
3060 case tcc_comparison:
3062 for (i = 0; i < TREE_CODE_LENGTH (code); i++)
3063 FIND_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, i), refs);
3067 for (i = 1; i < TREE_OPERAND_LENGTH (exp); i++)
3068 FIND_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, i), refs);
3076 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
3077 return a tree with all occurrences of references to F in a
3078 PLACEHOLDER_EXPR replaced by R. Also handle VAR_DECLs and
3079 CONST_DECLs. Note that we assume here that EXP contains only
3080 arithmetic expressions or CALL_EXPRs with PLACEHOLDER_EXPRs
3081 occurring only in their argument list. */
3084 substitute_in_expr (tree exp, tree f, tree r)
3086 enum tree_code code = TREE_CODE (exp);
3087 tree op0, op1, op2, op3;
3090 /* We handle TREE_LIST and COMPONENT_REF separately. */
3091 if (code == TREE_LIST)
3093 op0 = SUBSTITUTE_IN_EXPR (TREE_CHAIN (exp), f, r);
3094 op1 = SUBSTITUTE_IN_EXPR (TREE_VALUE (exp), f, r);
3095 if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
3098 return tree_cons (TREE_PURPOSE (exp), op1, op0);
3100 else if (code == COMPONENT_REF)
3104 /* If this expression is getting a value from a PLACEHOLDER_EXPR
3105 and it is the right field, replace it with R. */
3106 for (inner = TREE_OPERAND (exp, 0);
3107 REFERENCE_CLASS_P (inner);
3108 inner = TREE_OPERAND (inner, 0))
3112 op1 = TREE_OPERAND (exp, 1);
3114 if (TREE_CODE (inner) == PLACEHOLDER_EXPR && op1 == f)
3117 /* If this expression hasn't been completed let, leave it alone. */
3118 if (TREE_CODE (inner) == PLACEHOLDER_EXPR && !TREE_TYPE (inner))
3121 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
3122 if (op0 == TREE_OPERAND (exp, 0))
3126 = fold_build3 (COMPONENT_REF, TREE_TYPE (exp), op0, op1, NULL_TREE);
3129 switch (TREE_CODE_CLASS (code))
3134 case tcc_declaration:
3140 case tcc_expression:
3144 /* Fall through... */
3146 case tcc_exceptional:
3149 case tcc_comparison:
3151 switch (TREE_CODE_LENGTH (code))
3157 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
3158 if (op0 == TREE_OPERAND (exp, 0))
3161 new_tree = fold_build1 (code, TREE_TYPE (exp), op0);
3165 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
3166 op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
3168 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
3171 new_tree = fold_build2 (code, TREE_TYPE (exp), op0, op1);
3175 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
3176 op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
3177 op2 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 2), f, r);
3179 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
3180 && op2 == TREE_OPERAND (exp, 2))
3183 new_tree = fold_build3 (code, TREE_TYPE (exp), op0, op1, op2);
3187 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
3188 op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
3189 op2 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 2), f, r);
3190 op3 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 3), f, r);
3192 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
3193 && op2 == TREE_OPERAND (exp, 2)
3194 && op3 == TREE_OPERAND (exp, 3))
3198 = fold (build4 (code, TREE_TYPE (exp), op0, op1, op2, op3));
3210 new_tree = NULL_TREE;
3212 /* If we are trying to replace F with a constant, inline back
3213 functions which do nothing else than computing a value from
3214 the arguments they are passed. This makes it possible to
3215 fold partially or entirely the replacement expression. */
3216 if (CONSTANT_CLASS_P (r) && code == CALL_EXPR)
3218 tree t = maybe_inline_call_in_expr (exp);
3220 return SUBSTITUTE_IN_EXPR (t, f, r);
3223 for (i = 1; i < TREE_OPERAND_LENGTH (exp); i++)
3225 tree op = TREE_OPERAND (exp, i);
3226 tree new_op = SUBSTITUTE_IN_EXPR (op, f, r);
3230 new_tree = copy_node (exp);
3231 TREE_OPERAND (new_tree, i) = new_op;
3237 new_tree = fold (new_tree);
3238 if (TREE_CODE (new_tree) == CALL_EXPR)
3239 process_call_operands (new_tree);
3250 TREE_READONLY (new_tree) |= TREE_READONLY (exp);
3252 if (code == INDIRECT_REF || code == ARRAY_REF || code == ARRAY_RANGE_REF)
3253 TREE_THIS_NOTRAP (new_tree) |= TREE_THIS_NOTRAP (exp);
3258 /* Similar, but look for a PLACEHOLDER_EXPR in EXP and find a replacement
3259 for it within OBJ, a tree that is an object or a chain of references. */
3262 substitute_placeholder_in_expr (tree exp, tree obj)
3264 enum tree_code code = TREE_CODE (exp);
3265 tree op0, op1, op2, op3;
3268 /* If this is a PLACEHOLDER_EXPR, see if we find a corresponding type
3269 in the chain of OBJ. */
3270 if (code == PLACEHOLDER_EXPR)
3272 tree need_type = TYPE_MAIN_VARIANT (TREE_TYPE (exp));
3275 for (elt = obj; elt != 0;
3276 elt = ((TREE_CODE (elt) == COMPOUND_EXPR
3277 || TREE_CODE (elt) == COND_EXPR)
3278 ? TREE_OPERAND (elt, 1)
3279 : (REFERENCE_CLASS_P (elt)
3280 || UNARY_CLASS_P (elt)
3281 || BINARY_CLASS_P (elt)
3282 || VL_EXP_CLASS_P (elt)
3283 || EXPRESSION_CLASS_P (elt))
3284 ? TREE_OPERAND (elt, 0) : 0))
3285 if (TYPE_MAIN_VARIANT (TREE_TYPE (elt)) == need_type)
3288 for (elt = obj; elt != 0;
3289 elt = ((TREE_CODE (elt) == COMPOUND_EXPR
3290 || TREE_CODE (elt) == COND_EXPR)
3291 ? TREE_OPERAND (elt, 1)
3292 : (REFERENCE_CLASS_P (elt)
3293 || UNARY_CLASS_P (elt)
3294 || BINARY_CLASS_P (elt)
3295 || VL_EXP_CLASS_P (elt)
3296 || EXPRESSION_CLASS_P (elt))
3297 ? TREE_OPERAND (elt, 0) : 0))
3298 if (POINTER_TYPE_P (TREE_TYPE (elt))
3299 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (elt)))
3301 return fold_build1 (INDIRECT_REF, need_type, elt);
3303 /* If we didn't find it, return the original PLACEHOLDER_EXPR. If it
3304 survives until RTL generation, there will be an error. */
3308 /* TREE_LIST is special because we need to look at TREE_VALUE
3309 and TREE_CHAIN, not TREE_OPERANDS. */
3310 else if (code == TREE_LIST)
3312 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp), obj);
3313 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp), obj);
3314 if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
3317 return tree_cons (TREE_PURPOSE (exp), op1, op0);
3320 switch (TREE_CODE_CLASS (code))
3323 case tcc_declaration:
3326 case tcc_exceptional:
3329 case tcc_comparison:
3330 case tcc_expression:
3333 switch (TREE_CODE_LENGTH (code))
3339 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
3340 if (op0 == TREE_OPERAND (exp, 0))
3343 new_tree = fold_build1 (code, TREE_TYPE (exp), op0);
3347 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
3348 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
3350 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
3353 new_tree = fold_build2 (code, TREE_TYPE (exp), op0, op1);
3357 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
3358 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
3359 op2 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 2), obj);
3361 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
3362 && op2 == TREE_OPERAND (exp, 2))
3365 new_tree = fold_build3 (code, TREE_TYPE (exp), op0, op1, op2);
3369 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
3370 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
3371 op2 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 2), obj);
3372 op3 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 3), obj);
3374 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
3375 && op2 == TREE_OPERAND (exp, 2)
3376 && op3 == TREE_OPERAND (exp, 3))
3380 = fold (build4 (code, TREE_TYPE (exp), op0, op1, op2, op3));
3392 new_tree = NULL_TREE;
3394 for (i = 1; i < TREE_OPERAND_LENGTH (exp); i++)
3396 tree op = TREE_OPERAND (exp, i);
3397 tree new_op = SUBSTITUTE_PLACEHOLDER_IN_EXPR (op, obj);
3401 new_tree = copy_node (exp);
3402 TREE_OPERAND (new_tree, i) = new_op;
3408 new_tree = fold (new_tree);
3409 if (TREE_CODE (new_tree) == CALL_EXPR)
3410 process_call_operands (new_tree);
3421 TREE_READONLY (new_tree) |= TREE_READONLY (exp);
3423 if (code == INDIRECT_REF || code == ARRAY_REF || code == ARRAY_RANGE_REF)
3424 TREE_THIS_NOTRAP (new_tree) |= TREE_THIS_NOTRAP (exp);
3429 /* Stabilize a reference so that we can use it any number of times
3430 without causing its operands to be evaluated more than once.
3431 Returns the stabilized reference. This works by means of save_expr,
3432 so see the caveats in the comments about save_expr.
3434 Also allows conversion expressions whose operands are references.
3435 Any other kind of expression is returned unchanged. */
3438 stabilize_reference (tree ref)
3441 enum tree_code code = TREE_CODE (ref);
3448 /* No action is needed in this case. */
3453 case FIX_TRUNC_EXPR:
3454 result = build_nt (code, stabilize_reference (TREE_OPERAND (ref, 0)));
3458 result = build_nt (INDIRECT_REF,
3459 stabilize_reference_1 (TREE_OPERAND (ref, 0)));
3463 result = build_nt (COMPONENT_REF,
3464 stabilize_reference (TREE_OPERAND (ref, 0)),
3465 TREE_OPERAND (ref, 1), NULL_TREE);
3469 result = build_nt (BIT_FIELD_REF,
3470 stabilize_reference (TREE_OPERAND (ref, 0)),
3471 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
3472 stabilize_reference_1 (TREE_OPERAND (ref, 2)));
3476 result = build_nt (ARRAY_REF,
3477 stabilize_reference (TREE_OPERAND (ref, 0)),
3478 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
3479 TREE_OPERAND (ref, 2), TREE_OPERAND (ref, 3));
3482 case ARRAY_RANGE_REF:
3483 result = build_nt (ARRAY_RANGE_REF,
3484 stabilize_reference (TREE_OPERAND (ref, 0)),
3485 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
3486 TREE_OPERAND (ref, 2), TREE_OPERAND (ref, 3));
3490 /* We cannot wrap the first expression in a SAVE_EXPR, as then
3491 it wouldn't be ignored. This matters when dealing with
3493 return stabilize_reference_1 (ref);
3495 /* If arg isn't a kind of lvalue we recognize, make no change.
3496 Caller should recognize the error for an invalid lvalue. */
3501 return error_mark_node;
3504 TREE_TYPE (result) = TREE_TYPE (ref);
3505 TREE_READONLY (result) = TREE_READONLY (ref);
3506 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (ref);
3507 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);
3512 /* Subroutine of stabilize_reference; this is called for subtrees of
3513 references. Any expression with side-effects must be put in a SAVE_EXPR
3514 to ensure that it is only evaluated once.
3516 We don't put SAVE_EXPR nodes around everything, because assigning very
3517 simple expressions to temporaries causes us to miss good opportunities
3518 for optimizations. Among other things, the opportunity to fold in the
3519 addition of a constant into an addressing mode often gets lost, e.g.
3520 "y[i+1] += x;". In general, we take the approach that we should not make
3521 an assignment unless we are forced into it - i.e., that any non-side effect
3522 operator should be allowed, and that cse should take care of coalescing
3523 multiple utterances of the same expression should that prove fruitful. */
3526 stabilize_reference_1 (tree e)
3529 enum tree_code code = TREE_CODE (e);
3531 /* We cannot ignore const expressions because it might be a reference
3532 to a const array but whose index contains side-effects. But we can
3533 ignore things that are actual constant or that already have been
3534 handled by this function. */
3536 if (tree_invariant_p (e))
3539 switch (TREE_CODE_CLASS (code))
3541 case tcc_exceptional:
3543 case tcc_declaration:
3544 case tcc_comparison:
3546 case tcc_expression:
3549 /* If the expression has side-effects, then encase it in a SAVE_EXPR
3550 so that it will only be evaluated once. */
3551 /* The reference (r) and comparison (<) classes could be handled as
3552 below, but it is generally faster to only evaluate them once. */
3553 if (TREE_SIDE_EFFECTS (e))
3554 return save_expr (e);
3558 /* Constants need no processing. In fact, we should never reach
3563 /* Division is slow and tends to be compiled with jumps,
3564 especially the division by powers of 2 that is often
3565 found inside of an array reference. So do it just once. */
3566 if (code == TRUNC_DIV_EXPR || code == TRUNC_MOD_EXPR
3567 || code == FLOOR_DIV_EXPR || code == FLOOR_MOD_EXPR
3568 || code == CEIL_DIV_EXPR || code == CEIL_MOD_EXPR
3569 || code == ROUND_DIV_EXPR || code == ROUND_MOD_EXPR)
3570 return save_expr (e);
3571 /* Recursively stabilize each operand. */
3572 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)),
3573 stabilize_reference_1 (TREE_OPERAND (e, 1)));
3577 /* Recursively stabilize each operand. */
3578 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)));
3585 TREE_TYPE (result) = TREE_TYPE (e);
3586 TREE_READONLY (result) = TREE_READONLY (e);
3587 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (e);
3588 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);
3593 /* Low-level constructors for expressions. */
3595 /* A helper function for build1 and constant folders. Set TREE_CONSTANT,
3596 and TREE_SIDE_EFFECTS for an ADDR_EXPR. */
3599 recompute_tree_invariant_for_addr_expr (tree t)
3602 bool tc = true, se = false;
3604 /* We started out assuming this address is both invariant and constant, but
3605 does not have side effects. Now go down any handled components and see if
3606 any of them involve offsets that are either non-constant or non-invariant.
3607 Also check for side-effects.
3609 ??? Note that this code makes no attempt to deal with the case where
3610 taking the address of something causes a copy due to misalignment. */
3612 #define UPDATE_FLAGS(NODE) \
3613 do { tree _node = (NODE); \
3614 if (_node && !TREE_CONSTANT (_node)) tc = false; \
3615 if (_node && TREE_SIDE_EFFECTS (_node)) se = true; } while (0)
3617 for (node = TREE_OPERAND (t, 0); handled_component_p (node);
3618 node = TREE_OPERAND (node, 0))
3620 /* If the first operand doesn't have an ARRAY_TYPE, this is a bogus
3621 array reference (probably made temporarily by the G++ front end),
3622 so ignore all the operands. */
3623 if ((TREE_CODE (node) == ARRAY_REF
3624 || TREE_CODE (node) == ARRAY_RANGE_REF)
3625 && TREE_CODE (TREE_TYPE (TREE_OPERAND (node, 0))) == ARRAY_TYPE)
3627 UPDATE_FLAGS (TREE_OPERAND (node, 1));
3628 if (TREE_OPERAND (node, 2))
3629 UPDATE_FLAGS (TREE_OPERAND (node, 2));
3630 if (TREE_OPERAND (node, 3))
3631 UPDATE_FLAGS (TREE_OPERAND (node, 3));
3633 /* Likewise, just because this is a COMPONENT_REF doesn't mean we have a
3634 FIELD_DECL, apparently. The G++ front end can put something else
3635 there, at least temporarily. */
3636 else if (TREE_CODE (node) == COMPONENT_REF
3637 && TREE_CODE (TREE_OPERAND (node, 1)) == FIELD_DECL)
3639 if (TREE_OPERAND (node, 2))
3640 UPDATE_FLAGS (TREE_OPERAND (node, 2));
3642 else if (TREE_CODE (node) == BIT_FIELD_REF)
3643 UPDATE_FLAGS (TREE_OPERAND (node, 2));
3646 node = lang_hooks.expr_to_decl (node, &tc, &se);
3648 /* Now see what's inside. If it's an INDIRECT_REF, copy our properties from
3649 the address, since &(*a)->b is a form of addition. If it's a constant, the
3650 address is constant too. If it's a decl, its address is constant if the
3651 decl is static. Everything else is not constant and, furthermore,
3652 taking the address of a volatile variable is not volatile. */
3653 if (TREE_CODE (node) == INDIRECT_REF
3654 || TREE_CODE (node) == MEM_REF)
3655 UPDATE_FLAGS (TREE_OPERAND (node, 0));
3656 else if (CONSTANT_CLASS_P (node))
3658 else if (DECL_P (node))
3659 tc &= (staticp (node) != NULL_TREE);
3663 se |= TREE_SIDE_EFFECTS (node);
3667 TREE_CONSTANT (t) = tc;
3668 TREE_SIDE_EFFECTS (t) = se;
3672 /* Build an expression of code CODE, data type TYPE, and operands as
3673 specified. Expressions and reference nodes can be created this way.
3674 Constants, decls, types and misc nodes cannot be.
3676 We define 5 non-variadic functions, from 0 to 4 arguments. This is
3677 enough for all extant tree codes. */
3680 build0_stat (enum tree_code code, tree tt MEM_STAT_DECL)
3684 gcc_assert (TREE_CODE_LENGTH (code) == 0);
3686 t = make_node_stat (code PASS_MEM_STAT);
3693 build1_stat (enum tree_code code, tree type, tree node MEM_STAT_DECL)
3695 int length = sizeof (struct tree_exp);
3698 record_node_allocation_statistics (code, length);
3700 gcc_assert (TREE_CODE_LENGTH (code) == 1);
3702 t = ggc_alloc_zone_tree_node_stat (&tree_zone, length PASS_MEM_STAT);
3704 memset (t, 0, sizeof (struct tree_common));
3706 TREE_SET_CODE (t, code);
3708 TREE_TYPE (t) = type;
3709 SET_EXPR_LOCATION (t, UNKNOWN_LOCATION);
3710 TREE_OPERAND (t, 0) = node;
3711 TREE_BLOCK (t) = NULL_TREE;
3712 if (node && !TYPE_P (node))
3714 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (node);
3715 TREE_READONLY (t) = TREE_READONLY (node);
3718 if (TREE_CODE_CLASS (code) == tcc_statement)
3719 TREE_SIDE_EFFECTS (t) = 1;
3723 /* All of these have side-effects, no matter what their
3725 TREE_SIDE_EFFECTS (t) = 1;
3726 TREE_READONLY (t) = 0;
3730 /* Whether a dereference is readonly has nothing to do with whether
3731 its operand is readonly. */
3732 TREE_READONLY (t) = 0;
3737 recompute_tree_invariant_for_addr_expr (t);
3741 if ((TREE_CODE_CLASS (code) == tcc_unary || code == VIEW_CONVERT_EXPR)
3742 && node && !TYPE_P (node)
3743 && TREE_CONSTANT (node))
3744 TREE_CONSTANT (t) = 1;
3745 if (TREE_CODE_CLASS (code) == tcc_reference
3746 && node && TREE_THIS_VOLATILE (node))
3747 TREE_THIS_VOLATILE (t) = 1;
3754 #define PROCESS_ARG(N) \
3756 TREE_OPERAND (t, N) = arg##N; \
3757 if (arg##N &&!TYPE_P (arg##N)) \
3759 if (TREE_SIDE_EFFECTS (arg##N)) \
3761 if (!TREE_READONLY (arg##N) \
3762 && !CONSTANT_CLASS_P (arg##N)) \
3763 (void) (read_only = 0); \
3764 if (!TREE_CONSTANT (arg##N)) \
3765 (void) (constant = 0); \
3770 build2_stat (enum tree_code code, tree tt, tree arg0, tree arg1 MEM_STAT_DECL)
3772 bool constant, read_only, side_effects;
3775 gcc_assert (TREE_CODE_LENGTH (code) == 2);
3777 if ((code == MINUS_EXPR || code == PLUS_EXPR || code == MULT_EXPR)
3778 && arg0 && arg1 && tt && POINTER_TYPE_P (tt)
3779 /* When sizetype precision doesn't match that of pointers
3780 we need to be able to build explicit extensions or truncations
3781 of the offset argument. */
3782 && TYPE_PRECISION (sizetype) == TYPE_PRECISION (tt))
3783 gcc_assert (TREE_CODE (arg0) == INTEGER_CST
3784 && TREE_CODE (arg1) == INTEGER_CST);
3786 if (code == POINTER_PLUS_EXPR && arg0 && arg1 && tt)
3787 gcc_assert (POINTER_TYPE_P (tt) && POINTER_TYPE_P (TREE_TYPE (arg0))
3788 && ptrofftype_p (TREE_TYPE (arg1)));
3790 t = make_node_stat (code PASS_MEM_STAT);
3793 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
3794 result based on those same flags for the arguments. But if the
3795 arguments aren't really even `tree' expressions, we shouldn't be trying
3798 /* Expressions without side effects may be constant if their
3799 arguments are as well. */
3800 constant = (TREE_CODE_CLASS (code) == tcc_comparison
3801 || TREE_CODE_CLASS (code) == tcc_binary);
3803 side_effects = TREE_SIDE_EFFECTS (t);
3808 TREE_READONLY (t) = read_only;
3809 TREE_CONSTANT (t) = constant;
3810 TREE_SIDE_EFFECTS (t) = side_effects;
3811 TREE_THIS_VOLATILE (t)
3812 = (TREE_CODE_CLASS (code) == tcc_reference
3813 && arg0 && TREE_THIS_VOLATILE (arg0));
3820 build3_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
3821 tree arg2 MEM_STAT_DECL)
3823 bool constant, read_only, side_effects;
3826 gcc_assert (TREE_CODE_LENGTH (code) == 3);
3827 gcc_assert (TREE_CODE_CLASS (code) != tcc_vl_exp);
3829 t = make_node_stat (code PASS_MEM_STAT);
3834 /* As a special exception, if COND_EXPR has NULL branches, we
3835 assume that it is a gimple statement and always consider
3836 it to have side effects. */
3837 if (code == COND_EXPR
3838 && tt == void_type_node
3839 && arg1 == NULL_TREE
3840 && arg2 == NULL_TREE)
3841 side_effects = true;
3843 side_effects = TREE_SIDE_EFFECTS (t);
3849 if (code == COND_EXPR)
3850 TREE_READONLY (t) = read_only;
3852 TREE_SIDE_EFFECTS (t) = side_effects;
3853 TREE_THIS_VOLATILE (t)
3854 = (TREE_CODE_CLASS (code) == tcc_reference
3855 && arg0 && TREE_THIS_VOLATILE (arg0));
3861 build4_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
3862 tree arg2, tree arg3 MEM_STAT_DECL)
3864 bool constant, read_only, side_effects;
3867 gcc_assert (TREE_CODE_LENGTH (code) == 4);
3869 t = make_node_stat (code PASS_MEM_STAT);
3872 side_effects = TREE_SIDE_EFFECTS (t);
3879 TREE_SIDE_EFFECTS (t) = side_effects;
3880 TREE_THIS_VOLATILE (t)
3881 = (TREE_CODE_CLASS (code) == tcc_reference
3882 && arg0 && TREE_THIS_VOLATILE (arg0));
3888 build5_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
3889 tree arg2, tree arg3, tree arg4 MEM_STAT_DECL)
3891 bool constant, read_only, side_effects;
3894 gcc_assert (TREE_CODE_LENGTH (code) == 5);
3896 t = make_node_stat (code PASS_MEM_STAT);
3899 side_effects = TREE_SIDE_EFFECTS (t);
3907 TREE_SIDE_EFFECTS (t) = side_effects;
3908 TREE_THIS_VOLATILE (t)
3909 = (TREE_CODE_CLASS (code) == tcc_reference
3910 && arg0 && TREE_THIS_VOLATILE (arg0));
3916 build6_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
3917 tree arg2, tree arg3, tree arg4, tree arg5 MEM_STAT_DECL)
3919 bool constant, read_only, side_effects;
3922 gcc_assert (code == TARGET_MEM_REF);
3924 t = make_node_stat (code PASS_MEM_STAT);
3927 side_effects = TREE_SIDE_EFFECTS (t);
3934 if (code == TARGET_MEM_REF)
3938 TREE_SIDE_EFFECTS (t) = side_effects;
3939 TREE_THIS_VOLATILE (t)
3940 = (code == TARGET_MEM_REF
3941 && arg5 && TREE_THIS_VOLATILE (arg5));
3946 /* Build a simple MEM_REF tree with the sematics of a plain INDIRECT_REF
3947 on the pointer PTR. */
3950 build_simple_mem_ref_loc (location_t loc, tree ptr)
3952 HOST_WIDE_INT offset = 0;
3953 tree ptype = TREE_TYPE (ptr);
3955 /* For convenience allow addresses that collapse to a simple base
3957 if (TREE_CODE (ptr) == ADDR_EXPR
3958 && (handled_component_p (TREE_OPERAND (ptr, 0))
3959 || TREE_CODE (TREE_OPERAND (ptr, 0)) == MEM_REF))
3961 ptr = get_addr_base_and_unit_offset (TREE_OPERAND (ptr, 0), &offset);
3963 ptr = build_fold_addr_expr (ptr);
3964 gcc_assert (is_gimple_reg (ptr) || is_gimple_min_invariant (ptr));
3966 tem = build2 (MEM_REF, TREE_TYPE (ptype),
3967 ptr, build_int_cst (ptype, offset));
3968 SET_EXPR_LOCATION (tem, loc);
3972 /* Return the constant offset of a MEM_REF or TARGET_MEM_REF tree T. */
3975 mem_ref_offset (const_tree t)
3977 tree toff = TREE_OPERAND (t, 1);
3978 return double_int_sext (tree_to_double_int (toff),
3979 TYPE_PRECISION (TREE_TYPE (toff)));
3982 /* Return the pointer-type relevant for TBAA purposes from the
3983 gimple memory reference tree T. This is the type to be used for
3984 the offset operand of MEM_REF or TARGET_MEM_REF replacements of T. */
3987 reference_alias_ptr_type (const_tree t)
3989 const_tree base = t;
3990 while (handled_component_p (base))
3991 base = TREE_OPERAND (base, 0);
3992 if (TREE_CODE (base) == MEM_REF)
3993 return TREE_TYPE (TREE_OPERAND (base, 1));
3994 else if (TREE_CODE (base) == TARGET_MEM_REF)
3995 return TREE_TYPE (TMR_OFFSET (base));
3997 return build_pointer_type (TYPE_MAIN_VARIANT (TREE_TYPE (base)));
4000 /* Return an invariant ADDR_EXPR of type TYPE taking the address of BASE
4001 offsetted by OFFSET units. */
4004 build_invariant_address (tree type, tree base, HOST_WIDE_INT offset)
4006 tree ref = fold_build2 (MEM_REF, TREE_TYPE (type),
4007 build_fold_addr_expr (base),
4008 build_int_cst (ptr_type_node, offset));
4009 tree addr = build1 (ADDR_EXPR, type, ref);
4010 recompute_tree_invariant_for_addr_expr (addr);
4014 /* Similar except don't specify the TREE_TYPE
4015 and leave the TREE_SIDE_EFFECTS as 0.
4016 It is permissible for arguments to be null,
4017 or even garbage if their values do not matter. */
4020 build_nt (enum tree_code code, ...)
4027 gcc_assert (TREE_CODE_CLASS (code) != tcc_vl_exp);
4031 t = make_node (code);
4032 length = TREE_CODE_LENGTH (code);
4034 for (i = 0; i < length; i++)
4035 TREE_OPERAND (t, i) = va_arg (p, tree);
4041 /* Similar to build_nt, but for creating a CALL_EXPR object with a
4045 build_nt_call_vec (tree fn, VEC(tree,gc) *args)
4050 ret = build_vl_exp (CALL_EXPR, VEC_length (tree, args) + 3);
4051 CALL_EXPR_FN (ret) = fn;
4052 CALL_EXPR_STATIC_CHAIN (ret) = NULL_TREE;
4053 FOR_EACH_VEC_ELT (tree, args, ix, t)
4054 CALL_EXPR_ARG (ret, ix) = t;
4058 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
4059 We do NOT enter this node in any sort of symbol table.
4061 LOC is the location of the decl.
4063 layout_decl is used to set up the decl's storage layout.
4064 Other slots are initialized to 0 or null pointers. */
4067 build_decl_stat (location_t loc, enum tree_code code, tree name,
4068 tree type MEM_STAT_DECL)
4072 t = make_node_stat (code PASS_MEM_STAT);
4073 DECL_SOURCE_LOCATION (t) = loc;
4075 /* if (type == error_mark_node)
4076 type = integer_type_node; */
4077 /* That is not done, deliberately, so that having error_mark_node
4078 as the type can suppress useless errors in the use of this variable. */
4080 DECL_NAME (t) = name;
4081 TREE_TYPE (t) = type;
4083 if (code == VAR_DECL || code == PARM_DECL || code == RESULT_DECL)
4089 /* Builds and returns function declaration with NAME and TYPE. */
4092 build_fn_decl (const char *name, tree type)
4094 tree id = get_identifier (name);
4095 tree decl = build_decl (input_location, FUNCTION_DECL, id, type);
4097 DECL_EXTERNAL (decl) = 1;
4098 TREE_PUBLIC (decl) = 1;
4099 DECL_ARTIFICIAL (decl) = 1;
4100 TREE_NOTHROW (decl) = 1;
4105 VEC(tree,gc) *all_translation_units;
4107 /* Builds a new translation-unit decl with name NAME, queues it in the
4108 global list of translation-unit decls and returns it. */
4111 build_translation_unit_decl (tree name)
4113 tree tu = build_decl (UNKNOWN_LOCATION, TRANSLATION_UNIT_DECL,
4115 TRANSLATION_UNIT_LANGUAGE (tu) = lang_hooks.name;
4116 VEC_safe_push (tree, gc, all_translation_units, tu);
4121 /* BLOCK nodes are used to represent the structure of binding contours
4122 and declarations, once those contours have been exited and their contents
4123 compiled. This information is used for outputting debugging info. */
4126 build_block (tree vars, tree subblocks, tree supercontext, tree chain)
4128 tree block = make_node (BLOCK);
4130 BLOCK_VARS (block) = vars;
4131 BLOCK_SUBBLOCKS (block) = subblocks;
4132 BLOCK_SUPERCONTEXT (block) = supercontext;
4133 BLOCK_CHAIN (block) = chain;
4138 /* Like SET_EXPR_LOCATION, but make sure the tree can have a location.
4140 LOC is the location to use in tree T. */
4143 protected_set_expr_location (tree t, location_t loc)
4145 if (t && CAN_HAVE_LOCATION_P (t))
4146 SET_EXPR_LOCATION (t, loc);
4149 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
4153 build_decl_attribute_variant (tree ddecl, tree attribute)
4155 DECL_ATTRIBUTES (ddecl) = attribute;
4159 /* Borrowed from hashtab.c iterative_hash implementation. */
4160 #define mix(a,b,c) \
4162 a -= b; a -= c; a ^= (c>>13); \
4163 b -= c; b -= a; b ^= (a<< 8); \
4164 c -= a; c -= b; c ^= ((b&0xffffffff)>>13); \
4165 a -= b; a -= c; a ^= ((c&0xffffffff)>>12); \
4166 b -= c; b -= a; b = (b ^ (a<<16)) & 0xffffffff; \
4167 c -= a; c -= b; c = (c ^ (b>> 5)) & 0xffffffff; \
4168 a -= b; a -= c; a = (a ^ (c>> 3)) & 0xffffffff; \
4169 b -= c; b -= a; b = (b ^ (a<<10)) & 0xffffffff; \
4170 c -= a; c -= b; c = (c ^ (b>>15)) & 0xffffffff; \
4174 /* Produce good hash value combining VAL and VAL2. */
4176 iterative_hash_hashval_t (hashval_t val, hashval_t val2)
4178 /* the golden ratio; an arbitrary value. */
4179 hashval_t a = 0x9e3779b9;
4185 /* Produce good hash value combining VAL and VAL2. */
4187 iterative_hash_host_wide_int (HOST_WIDE_INT val, hashval_t val2)
4189 if (sizeof (HOST_WIDE_INT) == sizeof (hashval_t))
4190 return iterative_hash_hashval_t (val, val2);
4193 hashval_t a = (hashval_t) val;
4194 /* Avoid warnings about shifting of more than the width of the type on
4195 hosts that won't execute this path. */
4197 hashval_t b = (hashval_t) (val >> (sizeof (hashval_t) * 8 + zero));
4199 if (sizeof (HOST_WIDE_INT) > 2 * sizeof (hashval_t))
4201 hashval_t a = (hashval_t) (val >> (sizeof (hashval_t) * 16 + zero));
4202 hashval_t b = (hashval_t) (val >> (sizeof (hashval_t) * 24 + zero));
4209 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
4210 is ATTRIBUTE and its qualifiers are QUALS.
4212 Record such modified types already made so we don't make duplicates. */
4215 build_type_attribute_qual_variant (tree ttype, tree attribute, int quals)
4217 if (! attribute_list_equal (TYPE_ATTRIBUTES (ttype), attribute))
4219 hashval_t hashcode = 0;
4221 enum tree_code code = TREE_CODE (ttype);
4223 /* Building a distinct copy of a tagged type is inappropriate; it
4224 causes breakage in code that expects there to be a one-to-one
4225 relationship between a struct and its fields.
4226 build_duplicate_type is another solution (as used in
4227 handle_transparent_union_attribute), but that doesn't play well
4228 with the stronger C++ type identity model. */
4229 if (TREE_CODE (ttype) == RECORD_TYPE
4230 || TREE_CODE (ttype) == UNION_TYPE
4231 || TREE_CODE (ttype) == QUAL_UNION_TYPE
4232 || TREE_CODE (ttype) == ENUMERAL_TYPE)
4234 warning (OPT_Wattributes,
4235 "ignoring attributes applied to %qT after definition",
4236 TYPE_MAIN_VARIANT (ttype));
4237 return build_qualified_type (ttype, quals);
4240 ttype = build_qualified_type (ttype, TYPE_UNQUALIFIED);
4241 ntype = build_distinct_type_copy (ttype);
4243 TYPE_ATTRIBUTES (ntype) = attribute;
4245 hashcode = iterative_hash_object (code, hashcode);
4246 if (TREE_TYPE (ntype))
4247 hashcode = iterative_hash_object (TYPE_HASH (TREE_TYPE (ntype)),
4249 hashcode = attribute_hash_list (attribute, hashcode);
4251 switch (TREE_CODE (ntype))
4254 hashcode = type_hash_list (TYPE_ARG_TYPES (ntype), hashcode);
4257 if (TYPE_DOMAIN (ntype))
4258 hashcode = iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (ntype)),
4262 hashcode = iterative_hash_object
4263 (TREE_INT_CST_LOW (TYPE_MAX_VALUE (ntype)), hashcode);
4264 hashcode = iterative_hash_object
4265 (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (ntype)), hashcode);
4268 case FIXED_POINT_TYPE:
4270 unsigned int precision = TYPE_PRECISION (ntype);
4271 hashcode = iterative_hash_object (precision, hashcode);
4278 ntype = type_hash_canon (hashcode, ntype);
4280 /* If the target-dependent attributes make NTYPE different from
4281 its canonical type, we will need to use structural equality
4282 checks for this type. */
4283 if (TYPE_STRUCTURAL_EQUALITY_P (ttype)
4284 || !comp_type_attributes (ntype, ttype))
4285 SET_TYPE_STRUCTURAL_EQUALITY (ntype);
4286 else if (TYPE_CANONICAL (ntype) == ntype)
4287 TYPE_CANONICAL (ntype) = TYPE_CANONICAL (ttype);
4289 ttype = build_qualified_type (ntype, quals);
4291 else if (TYPE_QUALS (ttype) != quals)
4292 ttype = build_qualified_type (ttype, quals);
4297 /* Compare two attributes for their value identity. Return true if the
4298 attribute values are known to be equal; otherwise return false.
4302 attribute_value_equal (const_tree attr1, const_tree attr2)
4304 if (TREE_VALUE (attr1) == TREE_VALUE (attr2))
4307 if (TREE_VALUE (attr1) != NULL_TREE
4308 && TREE_CODE (TREE_VALUE (attr1)) == TREE_LIST
4309 && TREE_VALUE (attr2) != NULL
4310 && TREE_CODE (TREE_VALUE (attr2)) == TREE_LIST)
4311 return (simple_cst_list_equal (TREE_VALUE (attr1),
4312 TREE_VALUE (attr2)) == 1);
4314 return (simple_cst_equal (TREE_VALUE (attr1), TREE_VALUE (attr2)) == 1);
4317 /* Return 0 if the attributes for two types are incompatible, 1 if they
4318 are compatible, and 2 if they are nearly compatible (which causes a
4319 warning to be generated). */
4321 comp_type_attributes (const_tree type1, const_tree type2)
4323 const_tree a1 = TYPE_ATTRIBUTES (type1);
4324 const_tree a2 = TYPE_ATTRIBUTES (type2);
4329 for (a = a1; a != NULL_TREE; a = TREE_CHAIN (a))
4331 const struct attribute_spec *as;
4334 as = lookup_attribute_spec (TREE_PURPOSE (a));
4335 if (!as || as->affects_type_identity == false)
4338 attr = lookup_attribute (as->name, CONST_CAST_TREE (a2));
4339 if (!attr || !attribute_value_equal (a, attr))
4344 for (a = a2; a != NULL_TREE; a = TREE_CHAIN (a))
4346 const struct attribute_spec *as;
4348 as = lookup_attribute_spec (TREE_PURPOSE (a));
4349 if (!as || as->affects_type_identity == false)
4352 if (!lookup_attribute (as->name, CONST_CAST_TREE (a1)))
4354 /* We don't need to compare trees again, as we did this
4355 already in first loop. */
4357 /* All types - affecting identity - are equal, so
4358 there is no need to call target hook for comparison. */
4362 /* As some type combinations - like default calling-convention - might
4363 be compatible, we have to call the target hook to get the final result. */
4364 return targetm.comp_type_attributes (type1, type2);
4367 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
4370 Record such modified types already made so we don't make duplicates. */
4373 build_type_attribute_variant (tree ttype, tree attribute)
4375 return build_type_attribute_qual_variant (ttype, attribute,
4376 TYPE_QUALS (ttype));
4380 /* Reset the expression *EXPR_P, a size or position.
4382 ??? We could reset all non-constant sizes or positions. But it's cheap
4383 enough to not do so and refrain from adding workarounds to dwarf2out.c.
4385 We need to reset self-referential sizes or positions because they cannot
4386 be gimplified and thus can contain a CALL_EXPR after the gimplification
4387 is finished, which will run afoul of LTO streaming. And they need to be
4388 reset to something essentially dummy but not constant, so as to preserve
4389 the properties of the object they are attached to. */
4392 free_lang_data_in_one_sizepos (tree *expr_p)
4394 tree expr = *expr_p;
4395 if (CONTAINS_PLACEHOLDER_P (expr))
4396 *expr_p = build0 (PLACEHOLDER_EXPR, TREE_TYPE (expr));
4400 /* Reset all the fields in a binfo node BINFO. We only keep
4401 BINFO_VTABLE, which is used by gimple_fold_obj_type_ref. */
4404 free_lang_data_in_binfo (tree binfo)
4409 gcc_assert (TREE_CODE (binfo) == TREE_BINFO);
4411 BINFO_VIRTUALS (binfo) = NULL_TREE;
4412 BINFO_BASE_ACCESSES (binfo) = NULL;
4413 BINFO_INHERITANCE_CHAIN (binfo) = NULL_TREE;
4414 BINFO_SUBVTT_INDEX (binfo) = NULL_TREE;
4416 FOR_EACH_VEC_ELT (tree, BINFO_BASE_BINFOS (binfo), i, t)
4417 free_lang_data_in_binfo (t);
4421 /* Reset all language specific information still present in TYPE. */
4424 free_lang_data_in_type (tree type)
4426 gcc_assert (TYPE_P (type));
4428 /* Give the FE a chance to remove its own data first. */
4429 lang_hooks.free_lang_data (type);
4431 TREE_LANG_FLAG_0 (type) = 0;
4432 TREE_LANG_FLAG_1 (type) = 0;
4433 TREE_LANG_FLAG_2 (type) = 0;
4434 TREE_LANG_FLAG_3 (type) = 0;
4435 TREE_LANG_FLAG_4 (type) = 0;
4436 TREE_LANG_FLAG_5 (type) = 0;
4437 TREE_LANG_FLAG_6 (type) = 0;
4439 if (TREE_CODE (type) == FUNCTION_TYPE)
4441 /* Remove the const and volatile qualifiers from arguments. The
4442 C++ front end removes them, but the C front end does not,
4443 leading to false ODR violation errors when merging two
4444 instances of the same function signature compiled by
4445 different front ends. */
4448 for (p = TYPE_ARG_TYPES (type); p; p = TREE_CHAIN (p))
4450 tree arg_type = TREE_VALUE (p);
4452 if (TYPE_READONLY (arg_type) || TYPE_VOLATILE (arg_type))
4454 int quals = TYPE_QUALS (arg_type)
4456 & ~TYPE_QUAL_VOLATILE;
4457 TREE_VALUE (p) = build_qualified_type (arg_type, quals);
4458 free_lang_data_in_type (TREE_VALUE (p));
4463 /* Remove members that are not actually FIELD_DECLs from the field
4464 list of an aggregate. These occur in C++. */
4465 if (RECORD_OR_UNION_TYPE_P (type))
4469 /* Note that TYPE_FIELDS can be shared across distinct
4470 TREE_TYPEs. Therefore, if the first field of TYPE_FIELDS is
4471 to be removed, we cannot set its TREE_CHAIN to NULL.
4472 Otherwise, we would not be able to find all the other fields
4473 in the other instances of this TREE_TYPE.
4475 This was causing an ICE in testsuite/g++.dg/lto/20080915.C. */
4477 member = TYPE_FIELDS (type);
4480 if (TREE_CODE (member) == FIELD_DECL
4481 || TREE_CODE (member) == TYPE_DECL)
4484 TREE_CHAIN (prev) = member;
4486 TYPE_FIELDS (type) = member;
4490 member = TREE_CHAIN (member);
4494 TREE_CHAIN (prev) = NULL_TREE;
4496 TYPE_FIELDS (type) = NULL_TREE;
4498 TYPE_METHODS (type) = NULL_TREE;
4499 if (TYPE_BINFO (type))
4500 free_lang_data_in_binfo (TYPE_BINFO (type));
4504 /* For non-aggregate types, clear out the language slot (which
4505 overloads TYPE_BINFO). */
4506 TYPE_LANG_SLOT_1 (type) = NULL_TREE;
4508 if (INTEGRAL_TYPE_P (type)
4509 || SCALAR_FLOAT_TYPE_P (type)
4510 || FIXED_POINT_TYPE_P (type))
4512 free_lang_data_in_one_sizepos (&TYPE_MIN_VALUE (type));
4513 free_lang_data_in_one_sizepos (&TYPE_MAX_VALUE (type));
4517 free_lang_data_in_one_sizepos (&TYPE_SIZE (type));
4518 free_lang_data_in_one_sizepos (&TYPE_SIZE_UNIT (type));
4520 if (TYPE_CONTEXT (type)
4521 && TREE_CODE (TYPE_CONTEXT (type)) == BLOCK)
4523 tree ctx = TYPE_CONTEXT (type);
4526 ctx = BLOCK_SUPERCONTEXT (ctx);
4528 while (ctx && TREE_CODE (ctx) == BLOCK);
4529 TYPE_CONTEXT (type) = ctx;
4534 /* Return true if DECL may need an assembler name to be set. */
4537 need_assembler_name_p (tree decl)
4539 /* Only FUNCTION_DECLs and VAR_DECLs are considered. */
4540 if (TREE_CODE (decl) != FUNCTION_DECL
4541 && TREE_CODE (decl) != VAR_DECL)
4544 /* If DECL already has its assembler name set, it does not need a
4546 if (!HAS_DECL_ASSEMBLER_NAME_P (decl)
4547 || DECL_ASSEMBLER_NAME_SET_P (decl))
4550 /* Abstract decls do not need an assembler name. */
4551 if (DECL_ABSTRACT (decl))
4554 /* For VAR_DECLs, only static, public and external symbols need an
4556 if (TREE_CODE (decl) == VAR_DECL
4557 && !TREE_STATIC (decl)
4558 && !TREE_PUBLIC (decl)
4559 && !DECL_EXTERNAL (decl))
4562 if (TREE_CODE (decl) == FUNCTION_DECL)
4564 /* Do not set assembler name on builtins. Allow RTL expansion to
4565 decide whether to expand inline or via a regular call. */
4566 if (DECL_BUILT_IN (decl)
4567 && DECL_BUILT_IN_CLASS (decl) != BUILT_IN_FRONTEND)
4570 /* Functions represented in the callgraph need an assembler name. */
4571 if (cgraph_get_node (decl) != NULL)
4574 /* Unused and not public functions don't need an assembler name. */
4575 if (!TREE_USED (decl) && !TREE_PUBLIC (decl))
4583 /* Reset all language specific information still present in symbol
4587 free_lang_data_in_decl (tree decl)
4589 gcc_assert (DECL_P (decl));
4591 /* Give the FE a chance to remove its own data first. */
4592 lang_hooks.free_lang_data (decl);
4594 TREE_LANG_FLAG_0 (decl) = 0;
4595 TREE_LANG_FLAG_1 (decl) = 0;
4596 TREE_LANG_FLAG_2 (decl) = 0;
4597 TREE_LANG_FLAG_3 (decl) = 0;
4598 TREE_LANG_FLAG_4 (decl) = 0;
4599 TREE_LANG_FLAG_5 (decl) = 0;
4600 TREE_LANG_FLAG_6 (decl) = 0;
4602 free_lang_data_in_one_sizepos (&DECL_SIZE (decl));
4603 free_lang_data_in_one_sizepos (&DECL_SIZE_UNIT (decl));
4604 if (TREE_CODE (decl) == FIELD_DECL)
4606 free_lang_data_in_one_sizepos (&DECL_FIELD_OFFSET (decl));
4607 if (TREE_CODE (DECL_CONTEXT (decl)) == QUAL_UNION_TYPE)
4608 DECL_QUALIFIER (decl) = NULL_TREE;
4611 if (TREE_CODE (decl) == FUNCTION_DECL)
4613 if (gimple_has_body_p (decl))
4617 /* If DECL has a gimple body, then the context for its
4618 arguments must be DECL. Otherwise, it doesn't really
4619 matter, as we will not be emitting any code for DECL. In
4620 general, there may be other instances of DECL created by
4621 the front end and since PARM_DECLs are generally shared,
4622 their DECL_CONTEXT changes as the replicas of DECL are
4623 created. The only time where DECL_CONTEXT is important
4624 is for the FUNCTION_DECLs that have a gimple body (since
4625 the PARM_DECL will be used in the function's body). */
4626 for (t = DECL_ARGUMENTS (decl); t; t = TREE_CHAIN (t))
4627 DECL_CONTEXT (t) = decl;
4630 /* DECL_SAVED_TREE holds the GENERIC representation for DECL.
4631 At this point, it is not needed anymore. */
4632 DECL_SAVED_TREE (decl) = NULL_TREE;
4634 /* Clear the abstract origin if it refers to a method. Otherwise
4635 dwarf2out.c will ICE as we clear TYPE_METHODS and thus the
4636 origin will not be output correctly. */
4637 if (DECL_ABSTRACT_ORIGIN (decl)
4638 && DECL_CONTEXT (DECL_ABSTRACT_ORIGIN (decl))
4639 && RECORD_OR_UNION_TYPE_P
4640 (DECL_CONTEXT (DECL_ABSTRACT_ORIGIN (decl))))
4641 DECL_ABSTRACT_ORIGIN (decl) = NULL_TREE;
4643 /* Sometimes the C++ frontend doesn't manage to transform a temporary
4644 DECL_VINDEX referring to itself into a vtable slot number as it
4645 should. Happens with functions that are copied and then forgotten
4646 about. Just clear it, it won't matter anymore. */
4647 if (DECL_VINDEX (decl) && !host_integerp (DECL_VINDEX (decl), 0))
4648 DECL_VINDEX (decl) = NULL_TREE;
4650 else if (TREE_CODE (decl) == VAR_DECL)
4652 if ((DECL_EXTERNAL (decl)
4653 && (!TREE_STATIC (decl) || !TREE_READONLY (decl)))
4654 || (decl_function_context (decl) && !TREE_STATIC (decl)))
4655 DECL_INITIAL (decl) = NULL_TREE;
4657 else if (TREE_CODE (decl) == TYPE_DECL
4658 || TREE_CODE (decl) == FIELD_DECL)
4659 DECL_INITIAL (decl) = NULL_TREE;
4660 else if (TREE_CODE (decl) == TRANSLATION_UNIT_DECL
4661 && DECL_INITIAL (decl)
4662 && TREE_CODE (DECL_INITIAL (decl)) == BLOCK)
4664 /* Strip builtins from the translation-unit BLOCK. We still have targets
4665 without builtin_decl_explicit support and also builtins are shared
4666 nodes and thus we can't use TREE_CHAIN in multiple lists. */
4667 tree *nextp = &BLOCK_VARS (DECL_INITIAL (decl));
4671 if (TREE_CODE (var) == FUNCTION_DECL
4672 && DECL_BUILT_IN (var))
4673 *nextp = TREE_CHAIN (var);
4675 nextp = &TREE_CHAIN (var);
4681 /* Data used when collecting DECLs and TYPEs for language data removal. */
4683 struct free_lang_data_d
4685 /* Worklist to avoid excessive recursion. */
4686 VEC(tree,heap) *worklist;
4688 /* Set of traversed objects. Used to avoid duplicate visits. */
4689 struct pointer_set_t *pset;
4691 /* Array of symbols to process with free_lang_data_in_decl. */
4692 VEC(tree,heap) *decls;
4694 /* Array of types to process with free_lang_data_in_type. */
4695 VEC(tree,heap) *types;
4699 /* Save all language fields needed to generate proper debug information
4700 for DECL. This saves most fields cleared out by free_lang_data_in_decl. */
4703 save_debug_info_for_decl (tree t)
4705 /*struct saved_debug_info_d *sdi;*/
4707 gcc_assert (debug_info_level > DINFO_LEVEL_TERSE && t && DECL_P (t));
4709 /* FIXME. Partial implementation for saving debug info removed. */
4713 /* Save all language fields needed to generate proper debug information
4714 for TYPE. This saves most fields cleared out by free_lang_data_in_type. */
4717 save_debug_info_for_type (tree t)
4719 /*struct saved_debug_info_d *sdi;*/
4721 gcc_assert (debug_info_level > DINFO_LEVEL_TERSE && t && TYPE_P (t));
4723 /* FIXME. Partial implementation for saving debug info removed. */
4727 /* Add type or decl T to one of the list of tree nodes that need their
4728 language data removed. The lists are held inside FLD. */
4731 add_tree_to_fld_list (tree t, struct free_lang_data_d *fld)
4735 VEC_safe_push (tree, heap, fld->decls, t);
4736 if (debug_info_level > DINFO_LEVEL_TERSE)
4737 save_debug_info_for_decl (t);
4739 else if (TYPE_P (t))
4741 VEC_safe_push (tree, heap, fld->types, t);
4742 if (debug_info_level > DINFO_LEVEL_TERSE)
4743 save_debug_info_for_type (t);
4749 /* Push tree node T into FLD->WORKLIST. */
4752 fld_worklist_push (tree t, struct free_lang_data_d *fld)
4754 if (t && !is_lang_specific (t) && !pointer_set_contains (fld->pset, t))
4755 VEC_safe_push (tree, heap, fld->worklist, (t));
4759 /* Operand callback helper for free_lang_data_in_node. *TP is the
4760 subtree operand being considered. */
4763 find_decls_types_r (tree *tp, int *ws, void *data)
4766 struct free_lang_data_d *fld = (struct free_lang_data_d *) data;
4768 if (TREE_CODE (t) == TREE_LIST)
4771 /* Language specific nodes will be removed, so there is no need
4772 to gather anything under them. */
4773 if (is_lang_specific (t))
4781 /* Note that walk_tree does not traverse every possible field in
4782 decls, so we have to do our own traversals here. */
4783 add_tree_to_fld_list (t, fld);
4785 fld_worklist_push (DECL_NAME (t), fld);
4786 fld_worklist_push (DECL_CONTEXT (t), fld);
4787 fld_worklist_push (DECL_SIZE (t), fld);
4788 fld_worklist_push (DECL_SIZE_UNIT (t), fld);
4790 /* We are going to remove everything under DECL_INITIAL for
4791 TYPE_DECLs. No point walking them. */
4792 if (TREE_CODE (t) != TYPE_DECL)
4793 fld_worklist_push (DECL_INITIAL (t), fld);
4795 fld_worklist_push (DECL_ATTRIBUTES (t), fld);
4796 fld_worklist_push (DECL_ABSTRACT_ORIGIN (t), fld);
4798 if (TREE_CODE (t) == FUNCTION_DECL)
4800 fld_worklist_push (DECL_ARGUMENTS (t), fld);
4801 fld_worklist_push (DECL_RESULT (t), fld);
4803 else if (TREE_CODE (t) == TYPE_DECL)
4805 fld_worklist_push (DECL_ARGUMENT_FLD (t), fld);
4806 fld_worklist_push (DECL_VINDEX (t), fld);
4807 fld_worklist_push (DECL_ORIGINAL_TYPE (t), fld);
4809 else if (TREE_CODE (t) == FIELD_DECL)
4811 fld_worklist_push (DECL_FIELD_OFFSET (t), fld);
4812 fld_worklist_push (DECL_BIT_FIELD_TYPE (t), fld);
4813 fld_worklist_push (DECL_FIELD_BIT_OFFSET (t), fld);
4814 fld_worklist_push (DECL_FCONTEXT (t), fld);
4816 else if (TREE_CODE (t) == VAR_DECL)
4818 fld_worklist_push (DECL_SECTION_NAME (t), fld);
4819 fld_worklist_push (DECL_COMDAT_GROUP (t), fld);
4822 if ((TREE_CODE (t) == VAR_DECL || TREE_CODE (t) == PARM_DECL)
4823 && DECL_HAS_VALUE_EXPR_P (t))
4824 fld_worklist_push (DECL_VALUE_EXPR (t), fld);
4826 if (TREE_CODE (t) != FIELD_DECL
4827 && TREE_CODE (t) != TYPE_DECL)
4828 fld_worklist_push (TREE_CHAIN (t), fld);
4831 else if (TYPE_P (t))
4833 /* Note that walk_tree does not traverse every possible field in
4834 types, so we have to do our own traversals here. */
4835 add_tree_to_fld_list (t, fld);
4837 if (!RECORD_OR_UNION_TYPE_P (t))
4838 fld_worklist_push (TYPE_CACHED_VALUES (t), fld);
4839 fld_worklist_push (TYPE_SIZE (t), fld);
4840 fld_worklist_push (TYPE_SIZE_UNIT (t), fld);
4841 fld_worklist_push (TYPE_ATTRIBUTES (t), fld);
4842 fld_worklist_push (TYPE_POINTER_TO (t), fld);
4843 fld_worklist_push (TYPE_REFERENCE_TO (t), fld);
4844 fld_worklist_push (TYPE_NAME (t), fld);
4845 /* Do not walk TYPE_NEXT_PTR_TO or TYPE_NEXT_REF_TO. We do not stream
4846 them and thus do not and want not to reach unused pointer types
4848 if (!POINTER_TYPE_P (t))
4849 fld_worklist_push (TYPE_MINVAL (t), fld);
4850 if (!RECORD_OR_UNION_TYPE_P (t))
4851 fld_worklist_push (TYPE_MAXVAL (t), fld);
4852 fld_worklist_push (TYPE_MAIN_VARIANT (t), fld);
4853 /* Do not walk TYPE_NEXT_VARIANT. We do not stream it and thus
4854 do not and want not to reach unused variants this way. */
4855 fld_worklist_push (TYPE_CONTEXT (t), fld);
4856 /* Do not walk TYPE_CANONICAL. We do not stream it and thus do not
4857 and want not to reach unused types this way. */
4859 if (RECORD_OR_UNION_TYPE_P (t) && TYPE_BINFO (t))
4863 for (i = 0; VEC_iterate (tree, BINFO_BASE_BINFOS (TYPE_BINFO (t)),
4865 fld_worklist_push (TREE_TYPE (tem), fld);
4866 tem = BINFO_VIRTUALS (TYPE_BINFO (t));
4868 /* The Java FE overloads BINFO_VIRTUALS for its own purpose. */
4869 && TREE_CODE (tem) == TREE_LIST)
4872 fld_worklist_push (TREE_VALUE (tem), fld);
4873 tem = TREE_CHAIN (tem);
4877 if (RECORD_OR_UNION_TYPE_P (t))
4880 /* Push all TYPE_FIELDS - there can be interleaving interesting
4881 and non-interesting things. */
4882 tem = TYPE_FIELDS (t);
4885 if (TREE_CODE (tem) == FIELD_DECL
4886 || TREE_CODE (tem) == TYPE_DECL)
4887 fld_worklist_push (tem, fld);
4888 tem = TREE_CHAIN (tem);
4892 fld_worklist_push (TYPE_STUB_DECL (t), fld);
4895 else if (TREE_CODE (t) == BLOCK)
4898 for (tem = BLOCK_VARS (t); tem; tem = TREE_CHAIN (tem))
4899 fld_worklist_push (tem, fld);
4900 for (tem = BLOCK_SUBBLOCKS (t); tem; tem = BLOCK_CHAIN (tem))
4901 fld_worklist_push (tem, fld);
4902 fld_worklist_push (BLOCK_ABSTRACT_ORIGIN (t), fld);
4905 if (TREE_CODE (t) != IDENTIFIER_NODE
4906 && CODE_CONTAINS_STRUCT (TREE_CODE (t), TS_TYPED))
4907 fld_worklist_push (TREE_TYPE (t), fld);
4913 /* Find decls and types in T. */
4916 find_decls_types (tree t, struct free_lang_data_d *fld)
4920 if (!pointer_set_contains (fld->pset, t))
4921 walk_tree (&t, find_decls_types_r, fld, fld->pset);
4922 if (VEC_empty (tree, fld->worklist))
4924 t = VEC_pop (tree, fld->worklist);
4928 /* Translate all the types in LIST with the corresponding runtime
4932 get_eh_types_for_runtime (tree list)
4936 if (list == NULL_TREE)
4939 head = build_tree_list (0, lookup_type_for_runtime (TREE_VALUE (list)));
4941 list = TREE_CHAIN (list);
4944 tree n = build_tree_list (0, lookup_type_for_runtime (TREE_VALUE (list)));
4945 TREE_CHAIN (prev) = n;
4946 prev = TREE_CHAIN (prev);
4947 list = TREE_CHAIN (list);
4954 /* Find decls and types referenced in EH region R and store them in
4955 FLD->DECLS and FLD->TYPES. */
4958 find_decls_types_in_eh_region (eh_region r, struct free_lang_data_d *fld)
4969 /* The types referenced in each catch must first be changed to the
4970 EH types used at runtime. This removes references to FE types
4972 for (c = r->u.eh_try.first_catch; c ; c = c->next_catch)
4974 c->type_list = get_eh_types_for_runtime (c->type_list);
4975 walk_tree (&c->type_list, find_decls_types_r, fld, fld->pset);
4980 case ERT_ALLOWED_EXCEPTIONS:
4981 r->u.allowed.type_list
4982 = get_eh_types_for_runtime (r->u.allowed.type_list);
4983 walk_tree (&r->u.allowed.type_list, find_decls_types_r, fld, fld->pset);
4986 case ERT_MUST_NOT_THROW:
4987 walk_tree (&r->u.must_not_throw.failure_decl,
4988 find_decls_types_r, fld, fld->pset);
4994 /* Find decls and types referenced in cgraph node N and store them in
4995 FLD->DECLS and FLD->TYPES. Unlike pass_referenced_vars, this will
4996 look for *every* kind of DECL and TYPE node reachable from N,
4997 including those embedded inside types and decls (i.e,, TYPE_DECLs,
4998 NAMESPACE_DECLs, etc). */
5001 find_decls_types_in_node (struct cgraph_node *n, struct free_lang_data_d *fld)
5004 struct function *fn;
5008 find_decls_types (n->decl, fld);
5010 if (!gimple_has_body_p (n->decl))
5013 gcc_assert (current_function_decl == NULL_TREE && cfun == NULL);
5015 fn = DECL_STRUCT_FUNCTION (n->decl);
5017 /* Traverse locals. */
5018 FOR_EACH_LOCAL_DECL (fn, ix, t)
5019 find_decls_types (t, fld);
5021 /* Traverse EH regions in FN. */
5024 FOR_ALL_EH_REGION_FN (r, fn)
5025 find_decls_types_in_eh_region (r, fld);
5028 /* Traverse every statement in FN. */
5029 FOR_EACH_BB_FN (bb, fn)
5031 gimple_stmt_iterator si;
5034 for (si = gsi_start_phis (bb); !gsi_end_p (si); gsi_next (&si))
5036 gimple phi = gsi_stmt (si);
5038 for (i = 0; i < gimple_phi_num_args (phi); i++)
5040 tree *arg_p = gimple_phi_arg_def_ptr (phi, i);
5041 find_decls_types (*arg_p, fld);
5045 for (si = gsi_start_bb (bb); !gsi_end_p (si); gsi_next (&si))
5047 gimple stmt = gsi_stmt (si);
5049 if (is_gimple_call (stmt))
5050 find_decls_types (gimple_call_fntype (stmt), fld);
5052 for (i = 0; i < gimple_num_ops (stmt); i++)
5054 tree arg = gimple_op (stmt, i);
5055 find_decls_types (arg, fld);
5062 /* Find decls and types referenced in varpool node N and store them in
5063 FLD->DECLS and FLD->TYPES. Unlike pass_referenced_vars, this will
5064 look for *every* kind of DECL and TYPE node reachable from N,
5065 including those embedded inside types and decls (i.e,, TYPE_DECLs,
5066 NAMESPACE_DECLs, etc). */
5069 find_decls_types_in_var (struct varpool_node *v, struct free_lang_data_d *fld)
5071 find_decls_types (v->decl, fld);
5074 /* If T needs an assembler name, have one created for it. */
5077 assign_assembler_name_if_neeeded (tree t)
5079 if (need_assembler_name_p (t))
5081 /* When setting DECL_ASSEMBLER_NAME, the C++ mangler may emit
5082 diagnostics that use input_location to show locus
5083 information. The problem here is that, at this point,
5084 input_location is generally anchored to the end of the file
5085 (since the parser is long gone), so we don't have a good
5086 position to pin it to.
5088 To alleviate this problem, this uses the location of T's
5089 declaration. Examples of this are
5090 testsuite/g++.dg/template/cond2.C and
5091 testsuite/g++.dg/template/pr35240.C. */
5092 location_t saved_location = input_location;
5093 input_location = DECL_SOURCE_LOCATION (t);
5095 decl_assembler_name (t);
5097 input_location = saved_location;
5102 /* Free language specific information for every operand and expression
5103 in every node of the call graph. This process operates in three stages:
5105 1- Every callgraph node and varpool node is traversed looking for
5106 decls and types embedded in them. This is a more exhaustive
5107 search than that done by find_referenced_vars, because it will
5108 also collect individual fields, decls embedded in types, etc.
5110 2- All the decls found are sent to free_lang_data_in_decl.
5112 3- All the types found are sent to free_lang_data_in_type.
5114 The ordering between decls and types is important because
5115 free_lang_data_in_decl sets assembler names, which includes
5116 mangling. So types cannot be freed up until assembler names have
5120 free_lang_data_in_cgraph (void)
5122 struct cgraph_node *n;
5123 struct varpool_node *v;
5124 struct free_lang_data_d fld;
5129 /* Initialize sets and arrays to store referenced decls and types. */
5130 fld.pset = pointer_set_create ();
5131 fld.worklist = NULL;
5132 fld.decls = VEC_alloc (tree, heap, 100);
5133 fld.types = VEC_alloc (tree, heap, 100);
5135 /* Find decls and types in the body of every function in the callgraph. */
5136 for (n = cgraph_nodes; n; n = n->next)
5137 find_decls_types_in_node (n, &fld);
5139 FOR_EACH_VEC_ELT (alias_pair, alias_pairs, i, p)
5140 find_decls_types (p->decl, &fld);
5142 /* Find decls and types in every varpool symbol. */
5143 for (v = varpool_nodes; v; v = v->next)
5144 find_decls_types_in_var (v, &fld);
5146 /* Set the assembler name on every decl found. We need to do this
5147 now because free_lang_data_in_decl will invalidate data needed
5148 for mangling. This breaks mangling on interdependent decls. */
5149 FOR_EACH_VEC_ELT (tree, fld.decls, i, t)
5150 assign_assembler_name_if_neeeded (t);
5152 /* Traverse every decl found freeing its language data. */
5153 FOR_EACH_VEC_ELT (tree, fld.decls, i, t)
5154 free_lang_data_in_decl (t);
5156 /* Traverse every type found freeing its language data. */
5157 FOR_EACH_VEC_ELT (tree, fld.types, i, t)
5158 free_lang_data_in_type (t);
5160 pointer_set_destroy (fld.pset);
5161 VEC_free (tree, heap, fld.worklist);
5162 VEC_free (tree, heap, fld.decls);
5163 VEC_free (tree, heap, fld.types);
5167 /* Free resources that are used by FE but are not needed once they are done. */
5170 free_lang_data (void)
5174 /* If we are the LTO frontend we have freed lang-specific data already. */
5176 || !flag_generate_lto)
5179 /* Allocate and assign alias sets to the standard integer types
5180 while the slots are still in the way the frontends generated them. */
5181 for (i = 0; i < itk_none; ++i)
5182 if (integer_types[i])
5183 TYPE_ALIAS_SET (integer_types[i]) = get_alias_set (integer_types[i]);
5185 /* Traverse the IL resetting language specific information for
5186 operands, expressions, etc. */
5187 free_lang_data_in_cgraph ();
5189 /* Create gimple variants for common types. */
5190 ptrdiff_type_node = integer_type_node;
5191 fileptr_type_node = ptr_type_node;
5193 /* Reset some langhooks. Do not reset types_compatible_p, it may
5194 still be used indirectly via the get_alias_set langhook. */
5195 lang_hooks.callgraph.analyze_expr = NULL;
5196 lang_hooks.dwarf_name = lhd_dwarf_name;
5197 lang_hooks.decl_printable_name = gimple_decl_printable_name;
5198 /* We do not want the default decl_assembler_name implementation,
5199 rather if we have fixed everything we want a wrapper around it
5200 asserting that all non-local symbols already got their assembler
5201 name and only produce assembler names for local symbols. Or rather
5202 make sure we never call decl_assembler_name on local symbols and
5203 devise a separate, middle-end private scheme for it. */
5205 /* Reset diagnostic machinery. */
5206 diagnostic_starter (global_dc) = default_tree_diagnostic_starter;
5207 diagnostic_finalizer (global_dc) = default_diagnostic_finalizer;
5208 diagnostic_format_decoder (global_dc) = default_tree_printer;
5214 struct simple_ipa_opt_pass pass_ipa_free_lang_data =
5218 "*free_lang_data", /* name */
5220 free_lang_data, /* execute */
5223 0, /* static_pass_number */
5224 TV_IPA_FREE_LANG_DATA, /* tv_id */
5225 0, /* properties_required */
5226 0, /* properties_provided */
5227 0, /* properties_destroyed */
5228 0, /* todo_flags_start */
5229 TODO_ggc_collect /* todo_flags_finish */
5233 /* The backbone of is_attribute_p(). ATTR_LEN is the string length of
5234 ATTR_NAME. Also used internally by remove_attribute(). */
5236 private_is_attribute_p (const char *attr_name, size_t attr_len, const_tree ident)
5238 size_t ident_len = IDENTIFIER_LENGTH (ident);
5240 if (ident_len == attr_len)
5242 if (strcmp (attr_name, IDENTIFIER_POINTER (ident)) == 0)
5245 else if (ident_len == attr_len + 4)
5247 /* There is the possibility that ATTR is 'text' and IDENT is
5249 const char *p = IDENTIFIER_POINTER (ident);
5250 if (p[0] == '_' && p[1] == '_'
5251 && p[ident_len - 2] == '_' && p[ident_len - 1] == '_'
5252 && strncmp (attr_name, p + 2, attr_len) == 0)
5259 /* The backbone of lookup_attribute(). ATTR_LEN is the string length
5260 of ATTR_NAME, and LIST is not NULL_TREE. */
5262 private_lookup_attribute (const char *attr_name, size_t attr_len, tree list)
5266 size_t ident_len = IDENTIFIER_LENGTH (TREE_PURPOSE (list));
5268 if (ident_len == attr_len)
5270 if (strcmp (attr_name, IDENTIFIER_POINTER (TREE_PURPOSE (list))) == 0)
5273 /* TODO: If we made sure that attributes were stored in the
5274 canonical form without '__...__' (ie, as in 'text' as opposed
5275 to '__text__') then we could avoid the following case. */
5276 else if (ident_len == attr_len + 4)
5278 const char *p = IDENTIFIER_POINTER (TREE_PURPOSE (list));
5279 if (p[0] == '_' && p[1] == '_'
5280 && p[ident_len - 2] == '_' && p[ident_len - 1] == '_'
5281 && strncmp (attr_name, p + 2, attr_len) == 0)
5284 list = TREE_CHAIN (list);
5290 /* A variant of lookup_attribute() that can be used with an identifier
5291 as the first argument, and where the identifier can be either
5292 'text' or '__text__'.
5294 Given an attribute ATTR_IDENTIFIER, and a list of attributes LIST,
5295 return a pointer to the attribute's list element if the attribute
5296 is part of the list, or NULL_TREE if not found. If the attribute
5297 appears more than once, this only returns the first occurrence; the
5298 TREE_CHAIN of the return value should be passed back in if further
5299 occurrences are wanted. ATTR_IDENTIFIER must be an identifier but
5300 can be in the form 'text' or '__text__'. */
5302 lookup_ident_attribute (tree attr_identifier, tree list)
5304 gcc_checking_assert (TREE_CODE (attr_identifier) == IDENTIFIER_NODE);
5308 gcc_checking_assert (TREE_CODE (TREE_PURPOSE (list)) == IDENTIFIER_NODE);
5310 /* Identifiers can be compared directly for equality. */
5311 if (attr_identifier == TREE_PURPOSE (list))
5314 /* If they are not equal, they may still be one in the form
5315 'text' while the other one is in the form '__text__'. TODO:
5316 If we were storing attributes in normalized 'text' form, then
5317 this could all go away and we could take full advantage of
5318 the fact that we're comparing identifiers. :-) */
5320 size_t attr_len = IDENTIFIER_LENGTH (attr_identifier);
5321 size_t ident_len = IDENTIFIER_LENGTH (TREE_PURPOSE (list));
5323 if (ident_len == attr_len + 4)
5325 const char *p = IDENTIFIER_POINTER (TREE_PURPOSE (list));
5326 const char *q = IDENTIFIER_POINTER (attr_identifier);
5327 if (p[0] == '_' && p[1] == '_'
5328 && p[ident_len - 2] == '_' && p[ident_len - 1] == '_'
5329 && strncmp (q, p + 2, attr_len) == 0)
5332 else if (ident_len + 4 == attr_len)
5334 const char *p = IDENTIFIER_POINTER (TREE_PURPOSE (list));
5335 const char *q = IDENTIFIER_POINTER (attr_identifier);
5336 if (q[0] == '_' && q[1] == '_'
5337 && q[attr_len - 2] == '_' && q[attr_len - 1] == '_'
5338 && strncmp (q + 2, p, ident_len) == 0)
5342 list = TREE_CHAIN (list);
5348 /* Remove any instances of attribute ATTR_NAME in LIST and return the
5352 remove_attribute (const char *attr_name, tree list)
5355 size_t attr_len = strlen (attr_name);
5357 gcc_checking_assert (attr_name[0] != '_');
5359 for (p = &list; *p; )
5362 /* TODO: If we were storing attributes in normalized form, here
5363 we could use a simple strcmp(). */
5364 if (private_is_attribute_p (attr_name, attr_len, TREE_PURPOSE (l)))
5365 *p = TREE_CHAIN (l);
5367 p = &TREE_CHAIN (l);
5373 /* Return an attribute list that is the union of a1 and a2. */
5376 merge_attributes (tree a1, tree a2)
5380 /* Either one unset? Take the set one. */
5382 if ((attributes = a1) == 0)
5385 /* One that completely contains the other? Take it. */
5387 else if (a2 != 0 && ! attribute_list_contained (a1, a2))
5389 if (attribute_list_contained (a2, a1))
5393 /* Pick the longest list, and hang on the other list. */
5395 if (list_length (a1) < list_length (a2))
5396 attributes = a2, a2 = a1;
5398 for (; a2 != 0; a2 = TREE_CHAIN (a2))
5401 for (a = lookup_ident_attribute (TREE_PURPOSE (a2), attributes);
5402 a != NULL_TREE && !attribute_value_equal (a, a2);
5403 a = lookup_ident_attribute (TREE_PURPOSE (a2), TREE_CHAIN (a)))
5407 a1 = copy_node (a2);
5408 TREE_CHAIN (a1) = attributes;
5417 /* Given types T1 and T2, merge their attributes and return
5421 merge_type_attributes (tree t1, tree t2)
5423 return merge_attributes (TYPE_ATTRIBUTES (t1),
5424 TYPE_ATTRIBUTES (t2));
5427 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
5431 merge_decl_attributes (tree olddecl, tree newdecl)
5433 return merge_attributes (DECL_ATTRIBUTES (olddecl),
5434 DECL_ATTRIBUTES (newdecl));
5437 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
5439 /* Specialization of merge_decl_attributes for various Windows targets.
5441 This handles the following situation:
5443 __declspec (dllimport) int foo;
5446 The second instance of `foo' nullifies the dllimport. */
5449 merge_dllimport_decl_attributes (tree old, tree new_tree)
5452 int delete_dllimport_p = 1;
5454 /* What we need to do here is remove from `old' dllimport if it doesn't
5455 appear in `new'. dllimport behaves like extern: if a declaration is
5456 marked dllimport and a definition appears later, then the object
5457 is not dllimport'd. We also remove a `new' dllimport if the old list
5458 contains dllexport: dllexport always overrides dllimport, regardless
5459 of the order of declaration. */
5460 if (!VAR_OR_FUNCTION_DECL_P (new_tree))
5461 delete_dllimport_p = 0;
5462 else if (DECL_DLLIMPORT_P (new_tree)
5463 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (old)))
5465 DECL_DLLIMPORT_P (new_tree) = 0;
5466 warning (OPT_Wattributes, "%q+D already declared with dllexport attribute: "
5467 "dllimport ignored", new_tree);
5469 else if (DECL_DLLIMPORT_P (old) && !DECL_DLLIMPORT_P (new_tree))
5471 /* Warn about overriding a symbol that has already been used, e.g.:
5472 extern int __attribute__ ((dllimport)) foo;
5473 int* bar () {return &foo;}
5476 if (TREE_USED (old))
5478 warning (0, "%q+D redeclared without dllimport attribute "
5479 "after being referenced with dll linkage", new_tree);
5480 /* If we have used a variable's address with dllimport linkage,
5481 keep the old DECL_DLLIMPORT_P flag: the ADDR_EXPR using the
5482 decl may already have had TREE_CONSTANT computed.
5483 We still remove the attribute so that assembler code refers
5484 to '&foo rather than '_imp__foo'. */
5485 if (TREE_CODE (old) == VAR_DECL && TREE_ADDRESSABLE (old))
5486 DECL_DLLIMPORT_P (new_tree) = 1;
5489 /* Let an inline definition silently override the external reference,
5490 but otherwise warn about attribute inconsistency. */
5491 else if (TREE_CODE (new_tree) == VAR_DECL
5492 || !DECL_DECLARED_INLINE_P (new_tree))
5493 warning (OPT_Wattributes, "%q+D redeclared without dllimport attribute: "
5494 "previous dllimport ignored", new_tree);
5497 delete_dllimport_p = 0;
5499 a = merge_attributes (DECL_ATTRIBUTES (old), DECL_ATTRIBUTES (new_tree));
5501 if (delete_dllimport_p)
5502 a = remove_attribute ("dllimport", a);
5507 /* Handle a "dllimport" or "dllexport" attribute; arguments as in
5508 struct attribute_spec.handler. */
5511 handle_dll_attribute (tree * pnode, tree name, tree args, int flags,
5517 /* These attributes may apply to structure and union types being created,
5518 but otherwise should pass to the declaration involved. */
5521 if (flags & ((int) ATTR_FLAG_DECL_NEXT | (int) ATTR_FLAG_FUNCTION_NEXT
5522 | (int) ATTR_FLAG_ARRAY_NEXT))
5524 *no_add_attrs = true;
5525 return tree_cons (name, args, NULL_TREE);
5527 if (TREE_CODE (node) == RECORD_TYPE
5528 || TREE_CODE (node) == UNION_TYPE)
5530 node = TYPE_NAME (node);
5536 warning (OPT_Wattributes, "%qE attribute ignored",
5538 *no_add_attrs = true;
5543 if (TREE_CODE (node) != FUNCTION_DECL
5544 && TREE_CODE (node) != VAR_DECL
5545 && TREE_CODE (node) != TYPE_DECL)
5547 *no_add_attrs = true;
5548 warning (OPT_Wattributes, "%qE attribute ignored",
5553 if (TREE_CODE (node) == TYPE_DECL
5554 && TREE_CODE (TREE_TYPE (node)) != RECORD_TYPE
5555 && TREE_CODE (TREE_TYPE (node)) != UNION_TYPE)
5557 *no_add_attrs = true;
5558 warning (OPT_Wattributes, "%qE attribute ignored",
5563 is_dllimport = is_attribute_p ("dllimport", name);
5565 /* Report error on dllimport ambiguities seen now before they cause
5569 /* Honor any target-specific overrides. */
5570 if (!targetm.valid_dllimport_attribute_p (node))
5571 *no_add_attrs = true;
5573 else if (TREE_CODE (node) == FUNCTION_DECL
5574 && DECL_DECLARED_INLINE_P (node))
5576 warning (OPT_Wattributes, "inline function %q+D declared as "
5577 " dllimport: attribute ignored", node);
5578 *no_add_attrs = true;
5580 /* Like MS, treat definition of dllimported variables and
5581 non-inlined functions on declaration as syntax errors. */
5582 else if (TREE_CODE (node) == FUNCTION_DECL && DECL_INITIAL (node))
5584 error ("function %q+D definition is marked dllimport", node);
5585 *no_add_attrs = true;
5588 else if (TREE_CODE (node) == VAR_DECL)
5590 if (DECL_INITIAL (node))
5592 error ("variable %q+D definition is marked dllimport",
5594 *no_add_attrs = true;
5597 /* `extern' needn't be specified with dllimport.
5598 Specify `extern' now and hope for the best. Sigh. */
5599 DECL_EXTERNAL (node) = 1;
5600 /* Also, implicitly give dllimport'd variables declared within
5601 a function global scope, unless declared static. */
5602 if (current_function_decl != NULL_TREE && !TREE_STATIC (node))
5603 TREE_PUBLIC (node) = 1;
5606 if (*no_add_attrs == false)
5607 DECL_DLLIMPORT_P (node) = 1;
5609 else if (TREE_CODE (node) == FUNCTION_DECL
5610 && DECL_DECLARED_INLINE_P (node)
5611 && flag_keep_inline_dllexport)
5612 /* An exported function, even if inline, must be emitted. */
5613 DECL_EXTERNAL (node) = 0;
5615 /* Report error if symbol is not accessible at global scope. */
5616 if (!TREE_PUBLIC (node)
5617 && (TREE_CODE (node) == VAR_DECL
5618 || TREE_CODE (node) == FUNCTION_DECL))
5620 error ("external linkage required for symbol %q+D because of "
5621 "%qE attribute", node, name);
5622 *no_add_attrs = true;
5625 /* A dllexport'd entity must have default visibility so that other
5626 program units (shared libraries or the main executable) can see
5627 it. A dllimport'd entity must have default visibility so that
5628 the linker knows that undefined references within this program
5629 unit can be resolved by the dynamic linker. */
5632 if (DECL_VISIBILITY_SPECIFIED (node)
5633 && DECL_VISIBILITY (node) != VISIBILITY_DEFAULT)
5634 error ("%qE implies default visibility, but %qD has already "
5635 "been declared with a different visibility",
5637 DECL_VISIBILITY (node) = VISIBILITY_DEFAULT;
5638 DECL_VISIBILITY_SPECIFIED (node) = 1;
5644 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
5646 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
5647 of the various TYPE_QUAL values. */
5650 set_type_quals (tree type, int type_quals)
5652 TYPE_READONLY (type) = (type_quals & TYPE_QUAL_CONST) != 0;
5653 TYPE_VOLATILE (type) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
5654 TYPE_RESTRICT (type) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
5655 TYPE_ADDR_SPACE (type) = DECODE_QUAL_ADDR_SPACE (type_quals);
5658 /* Returns true iff CAND is equivalent to BASE with TYPE_QUALS. */
5661 check_qualified_type (const_tree cand, const_tree base, int type_quals)
5663 return (TYPE_QUALS (cand) == type_quals
5664 && TYPE_NAME (cand) == TYPE_NAME (base)
5665 /* Apparently this is needed for Objective-C. */
5666 && TYPE_CONTEXT (cand) == TYPE_CONTEXT (base)
5667 /* Check alignment. */
5668 && TYPE_ALIGN (cand) == TYPE_ALIGN (base)
5669 && attribute_list_equal (TYPE_ATTRIBUTES (cand),
5670 TYPE_ATTRIBUTES (base)));
5673 /* Returns true iff CAND is equivalent to BASE with ALIGN. */
5676 check_aligned_type (const_tree cand, const_tree base, unsigned int align)
5678 return (TYPE_QUALS (cand) == TYPE_QUALS (base)
5679 && TYPE_NAME (cand) == TYPE_NAME (base)
5680 /* Apparently this is needed for Objective-C. */
5681 && TYPE_CONTEXT (cand) == TYPE_CONTEXT (base)
5682 /* Check alignment. */
5683 && TYPE_ALIGN (cand) == align
5684 && attribute_list_equal (TYPE_ATTRIBUTES (cand),
5685 TYPE_ATTRIBUTES (base)));
5688 /* Return a version of the TYPE, qualified as indicated by the
5689 TYPE_QUALS, if one exists. If no qualified version exists yet,
5690 return NULL_TREE. */
5693 get_qualified_type (tree type, int type_quals)
5697 if (TYPE_QUALS (type) == type_quals)
5700 /* Search the chain of variants to see if there is already one there just
5701 like the one we need to have. If so, use that existing one. We must
5702 preserve the TYPE_NAME, since there is code that depends on this. */
5703 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
5704 if (check_qualified_type (t, type, type_quals))
5710 /* Like get_qualified_type, but creates the type if it does not
5711 exist. This function never returns NULL_TREE. */
5714 build_qualified_type (tree type, int type_quals)
5718 /* See if we already have the appropriate qualified variant. */
5719 t = get_qualified_type (type, type_quals);
5721 /* If not, build it. */
5724 t = build_variant_type_copy (type);
5725 set_type_quals (t, type_quals);
5727 if (TYPE_STRUCTURAL_EQUALITY_P (type))
5728 /* Propagate structural equality. */
5729 SET_TYPE_STRUCTURAL_EQUALITY (t);
5730 else if (TYPE_CANONICAL (type) != type)
5731 /* Build the underlying canonical type, since it is different
5733 TYPE_CANONICAL (t) = build_qualified_type (TYPE_CANONICAL (type),
5736 /* T is its own canonical type. */
5737 TYPE_CANONICAL (t) = t;
5744 /* Create a variant of type T with alignment ALIGN. */
5747 build_aligned_type (tree type, unsigned int align)
5751 if (TYPE_PACKED (type)
5752 || TYPE_ALIGN (type) == align)
5755 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
5756 if (check_aligned_type (t, type, align))
5759 t = build_variant_type_copy (type);
5760 TYPE_ALIGN (t) = align;
5765 /* Create a new distinct copy of TYPE. The new type is made its own
5766 MAIN_VARIANT. If TYPE requires structural equality checks, the
5767 resulting type requires structural equality checks; otherwise, its
5768 TYPE_CANONICAL points to itself. */
5771 build_distinct_type_copy (tree type)
5773 tree t = copy_node (type);
5775 TYPE_POINTER_TO (t) = 0;
5776 TYPE_REFERENCE_TO (t) = 0;
5778 /* Set the canonical type either to a new equivalence class, or
5779 propagate the need for structural equality checks. */
5780 if (TYPE_STRUCTURAL_EQUALITY_P (type))
5781 SET_TYPE_STRUCTURAL_EQUALITY (t);
5783 TYPE_CANONICAL (t) = t;
5785 /* Make it its own variant. */
5786 TYPE_MAIN_VARIANT (t) = t;
5787 TYPE_NEXT_VARIANT (t) = 0;
5789 /* Note that it is now possible for TYPE_MIN_VALUE to be a value
5790 whose TREE_TYPE is not t. This can also happen in the Ada
5791 frontend when using subtypes. */
5796 /* Create a new variant of TYPE, equivalent but distinct. This is so
5797 the caller can modify it. TYPE_CANONICAL for the return type will
5798 be equivalent to TYPE_CANONICAL of TYPE, indicating that the types
5799 are considered equal by the language itself (or that both types
5800 require structural equality checks). */
5803 build_variant_type_copy (tree type)
5805 tree t, m = TYPE_MAIN_VARIANT (type);
5807 t = build_distinct_type_copy (type);
5809 /* Since we're building a variant, assume that it is a non-semantic
5810 variant. This also propagates TYPE_STRUCTURAL_EQUALITY_P. */
5811 TYPE_CANONICAL (t) = TYPE_CANONICAL (type);
5813 /* Add the new type to the chain of variants of TYPE. */
5814 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (m);
5815 TYPE_NEXT_VARIANT (m) = t;
5816 TYPE_MAIN_VARIANT (t) = m;
5821 /* Return true if the from tree in both tree maps are equal. */
5824 tree_map_base_eq (const void *va, const void *vb)
5826 const struct tree_map_base *const a = (const struct tree_map_base *) va,
5827 *const b = (const struct tree_map_base *) vb;
5828 return (a->from == b->from);
5831 /* Hash a from tree in a tree_base_map. */
5834 tree_map_base_hash (const void *item)
5836 return htab_hash_pointer (((const struct tree_map_base *)item)->from);
5839 /* Return true if this tree map structure is marked for garbage collection
5840 purposes. We simply return true if the from tree is marked, so that this
5841 structure goes away when the from tree goes away. */
5844 tree_map_base_marked_p (const void *p)
5846 return ggc_marked_p (((const struct tree_map_base *) p)->from);
5849 /* Hash a from tree in a tree_map. */
5852 tree_map_hash (const void *item)
5854 return (((const struct tree_map *) item)->hash);
5857 /* Hash a from tree in a tree_decl_map. */
5860 tree_decl_map_hash (const void *item)
5862 return DECL_UID (((const struct tree_decl_map *) item)->base.from);
5865 /* Return the initialization priority for DECL. */
5868 decl_init_priority_lookup (tree decl)
5870 struct tree_priority_map *h;
5871 struct tree_map_base in;
5873 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
5875 h = (struct tree_priority_map *) htab_find (init_priority_for_decl, &in);
5876 return h ? h->init : DEFAULT_INIT_PRIORITY;
5879 /* Return the finalization priority for DECL. */
5882 decl_fini_priority_lookup (tree decl)
5884 struct tree_priority_map *h;
5885 struct tree_map_base in;
5887 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
5889 h = (struct tree_priority_map *) htab_find (init_priority_for_decl, &in);
5890 return h ? h->fini : DEFAULT_INIT_PRIORITY;
5893 /* Return the initialization and finalization priority information for
5894 DECL. If there is no previous priority information, a freshly
5895 allocated structure is returned. */
5897 static struct tree_priority_map *
5898 decl_priority_info (tree decl)
5900 struct tree_priority_map in;
5901 struct tree_priority_map *h;
5904 in.base.from = decl;
5905 loc = htab_find_slot (init_priority_for_decl, &in, INSERT);
5906 h = (struct tree_priority_map *) *loc;
5909 h = ggc_alloc_cleared_tree_priority_map ();
5911 h->base.from = decl;
5912 h->init = DEFAULT_INIT_PRIORITY;
5913 h->fini = DEFAULT_INIT_PRIORITY;
5919 /* Set the initialization priority for DECL to PRIORITY. */
5922 decl_init_priority_insert (tree decl, priority_type priority)
5924 struct tree_priority_map *h;
5926 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
5927 if (priority == DEFAULT_INIT_PRIORITY)
5929 h = decl_priority_info (decl);
5933 /* Set the finalization priority for DECL to PRIORITY. */
5936 decl_fini_priority_insert (tree decl, priority_type priority)
5938 struct tree_priority_map *h;
5940 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
5941 if (priority == DEFAULT_INIT_PRIORITY)
5943 h = decl_priority_info (decl);
5947 /* Print out the statistics for the DECL_DEBUG_EXPR hash table. */
5950 print_debug_expr_statistics (void)
5952 fprintf (stderr, "DECL_DEBUG_EXPR hash: size %ld, %ld elements, %f collisions\n",
5953 (long) htab_size (debug_expr_for_decl),
5954 (long) htab_elements (debug_expr_for_decl),
5955 htab_collisions (debug_expr_for_decl));
5958 /* Print out the statistics for the DECL_VALUE_EXPR hash table. */
5961 print_value_expr_statistics (void)
5963 fprintf (stderr, "DECL_VALUE_EXPR hash: size %ld, %ld elements, %f collisions\n",
5964 (long) htab_size (value_expr_for_decl),
5965 (long) htab_elements (value_expr_for_decl),
5966 htab_collisions (value_expr_for_decl));
5969 /* Lookup a debug expression for FROM, and return it if we find one. */
5972 decl_debug_expr_lookup (tree from)
5974 struct tree_decl_map *h, in;
5975 in.base.from = from;
5977 h = (struct tree_decl_map *)
5978 htab_find_with_hash (debug_expr_for_decl, &in, DECL_UID (from));
5984 /* Insert a mapping FROM->TO in the debug expression hashtable. */
5987 decl_debug_expr_insert (tree from, tree to)
5989 struct tree_decl_map *h;
5992 h = ggc_alloc_tree_decl_map ();
5993 h->base.from = from;
5995 loc = htab_find_slot_with_hash (debug_expr_for_decl, h, DECL_UID (from),
5997 *(struct tree_decl_map **) loc = h;
6000 /* Lookup a value expression for FROM, and return it if we find one. */
6003 decl_value_expr_lookup (tree from)
6005 struct tree_decl_map *h, in;
6006 in.base.from = from;
6008 h = (struct tree_decl_map *)
6009 htab_find_with_hash (value_expr_for_decl, &in, DECL_UID (from));
6015 /* Insert a mapping FROM->TO in the value expression hashtable. */
6018 decl_value_expr_insert (tree from, tree to)
6020 struct tree_decl_map *h;
6023 h = ggc_alloc_tree_decl_map ();
6024 h->base.from = from;
6026 loc = htab_find_slot_with_hash (value_expr_for_decl, h, DECL_UID (from),
6028 *(struct tree_decl_map **) loc = h;
6031 /* Lookup a vector of debug arguments for FROM, and return it if we
6035 decl_debug_args_lookup (tree from)
6037 struct tree_vec_map *h, in;
6039 if (!DECL_HAS_DEBUG_ARGS_P (from))
6041 gcc_checking_assert (debug_args_for_decl != NULL);
6042 in.base.from = from;
6043 h = (struct tree_vec_map *)
6044 htab_find_with_hash (debug_args_for_decl, &in, DECL_UID (from));
6050 /* Insert a mapping FROM->empty vector of debug arguments in the value
6051 expression hashtable. */
6054 decl_debug_args_insert (tree from)
6056 struct tree_vec_map *h;
6059 if (DECL_HAS_DEBUG_ARGS_P (from))
6060 return decl_debug_args_lookup (from);
6061 if (debug_args_for_decl == NULL)
6062 debug_args_for_decl = htab_create_ggc (64, tree_vec_map_hash,
6063 tree_vec_map_eq, 0);
6064 h = ggc_alloc_tree_vec_map ();
6065 h->base.from = from;
6067 loc = htab_find_slot_with_hash (debug_args_for_decl, h, DECL_UID (from),
6069 *(struct tree_vec_map **) loc = h;
6070 DECL_HAS_DEBUG_ARGS_P (from) = 1;
6074 /* Hashing of types so that we don't make duplicates.
6075 The entry point is `type_hash_canon'. */
6077 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
6078 with types in the TREE_VALUE slots), by adding the hash codes
6079 of the individual types. */
6082 type_hash_list (const_tree list, hashval_t hashcode)
6086 for (tail = list; tail; tail = TREE_CHAIN (tail))
6087 if (TREE_VALUE (tail) != error_mark_node)
6088 hashcode = iterative_hash_object (TYPE_HASH (TREE_VALUE (tail)),
6094 /* These are the Hashtable callback functions. */
6096 /* Returns true iff the types are equivalent. */
6099 type_hash_eq (const void *va, const void *vb)
6101 const struct type_hash *const a = (const struct type_hash *) va,
6102 *const b = (const struct type_hash *) vb;
6104 /* First test the things that are the same for all types. */
6105 if (a->hash != b->hash
6106 || TREE_CODE (a->type) != TREE_CODE (b->type)
6107 || TREE_TYPE (a->type) != TREE_TYPE (b->type)
6108 || !attribute_list_equal (TYPE_ATTRIBUTES (a->type),
6109 TYPE_ATTRIBUTES (b->type))
6110 || (TREE_CODE (a->type) != COMPLEX_TYPE
6111 && TYPE_NAME (a->type) != TYPE_NAME (b->type)))
6114 /* Be careful about comparing arrays before and after the element type
6115 has been completed; don't compare TYPE_ALIGN unless both types are
6117 if (COMPLETE_TYPE_P (a->type) && COMPLETE_TYPE_P (b->type)
6118 && (TYPE_ALIGN (a->type) != TYPE_ALIGN (b->type)
6119 || TYPE_MODE (a->type) != TYPE_MODE (b->type)))
6122 switch (TREE_CODE (a->type))
6127 case REFERENCE_TYPE:
6131 return TYPE_VECTOR_SUBPARTS (a->type) == TYPE_VECTOR_SUBPARTS (b->type);
6134 if (TYPE_VALUES (a->type) != TYPE_VALUES (b->type)
6135 && !(TYPE_VALUES (a->type)
6136 && TREE_CODE (TYPE_VALUES (a->type)) == TREE_LIST
6137 && TYPE_VALUES (b->type)
6138 && TREE_CODE (TYPE_VALUES (b->type)) == TREE_LIST
6139 && type_list_equal (TYPE_VALUES (a->type),
6140 TYPE_VALUES (b->type))))
6143 /* ... fall through ... */
6148 return ((TYPE_MAX_VALUE (a->type) == TYPE_MAX_VALUE (b->type)
6149 || tree_int_cst_equal (TYPE_MAX_VALUE (a->type),
6150 TYPE_MAX_VALUE (b->type)))
6151 && (TYPE_MIN_VALUE (a->type) == TYPE_MIN_VALUE (b->type)
6152 || tree_int_cst_equal (TYPE_MIN_VALUE (a->type),
6153 TYPE_MIN_VALUE (b->type))));
6155 case FIXED_POINT_TYPE:
6156 return TYPE_SATURATING (a->type) == TYPE_SATURATING (b->type);
6159 return TYPE_OFFSET_BASETYPE (a->type) == TYPE_OFFSET_BASETYPE (b->type);
6162 if (TYPE_METHOD_BASETYPE (a->type) == TYPE_METHOD_BASETYPE (b->type)
6163 && (TYPE_ARG_TYPES (a->type) == TYPE_ARG_TYPES (b->type)
6164 || (TYPE_ARG_TYPES (a->type)
6165 && TREE_CODE (TYPE_ARG_TYPES (a->type)) == TREE_LIST
6166 && TYPE_ARG_TYPES (b->type)
6167 && TREE_CODE (TYPE_ARG_TYPES (b->type)) == TREE_LIST
6168 && type_list_equal (TYPE_ARG_TYPES (a->type),
6169 TYPE_ARG_TYPES (b->type)))))
6173 return TYPE_DOMAIN (a->type) == TYPE_DOMAIN (b->type);
6177 case QUAL_UNION_TYPE:
6178 return (TYPE_FIELDS (a->type) == TYPE_FIELDS (b->type)
6179 || (TYPE_FIELDS (a->type)
6180 && TREE_CODE (TYPE_FIELDS (a->type)) == TREE_LIST
6181 && TYPE_FIELDS (b->type)
6182 && TREE_CODE (TYPE_FIELDS (b->type)) == TREE_LIST
6183 && type_list_equal (TYPE_FIELDS (a->type),
6184 TYPE_FIELDS (b->type))));
6187 if (TYPE_ARG_TYPES (a->type) == TYPE_ARG_TYPES (b->type)
6188 || (TYPE_ARG_TYPES (a->type)
6189 && TREE_CODE (TYPE_ARG_TYPES (a->type)) == TREE_LIST
6190 && TYPE_ARG_TYPES (b->type)
6191 && TREE_CODE (TYPE_ARG_TYPES (b->type)) == TREE_LIST
6192 && type_list_equal (TYPE_ARG_TYPES (a->type),
6193 TYPE_ARG_TYPES (b->type))))
6201 if (lang_hooks.types.type_hash_eq != NULL)
6202 return lang_hooks.types.type_hash_eq (a->type, b->type);
6207 /* Return the cached hash value. */
6210 type_hash_hash (const void *item)
6212 return ((const struct type_hash *) item)->hash;
6215 /* Look in the type hash table for a type isomorphic to TYPE.
6216 If one is found, return it. Otherwise return 0. */
6219 type_hash_lookup (hashval_t hashcode, tree type)
6221 struct type_hash *h, in;
6223 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
6224 must call that routine before comparing TYPE_ALIGNs. */
6230 h = (struct type_hash *) htab_find_with_hash (type_hash_table, &in,
6237 /* Add an entry to the type-hash-table
6238 for a type TYPE whose hash code is HASHCODE. */
6241 type_hash_add (hashval_t hashcode, tree type)
6243 struct type_hash *h;
6246 h = ggc_alloc_type_hash ();
6249 loc = htab_find_slot_with_hash (type_hash_table, h, hashcode, INSERT);
6253 /* Given TYPE, and HASHCODE its hash code, return the canonical
6254 object for an identical type if one already exists.
6255 Otherwise, return TYPE, and record it as the canonical object.
6257 To use this function, first create a type of the sort you want.
6258 Then compute its hash code from the fields of the type that
6259 make it different from other similar types.
6260 Then call this function and use the value. */
6263 type_hash_canon (unsigned int hashcode, tree type)
6267 /* The hash table only contains main variants, so ensure that's what we're
6269 gcc_assert (TYPE_MAIN_VARIANT (type) == type);
6271 /* See if the type is in the hash table already. If so, return it.
6272 Otherwise, add the type. */
6273 t1 = type_hash_lookup (hashcode, type);
6276 #ifdef GATHER_STATISTICS
6277 tree_code_counts[(int) TREE_CODE (type)]--;
6278 tree_node_counts[(int) t_kind]--;
6279 tree_node_sizes[(int) t_kind] -= sizeof (struct tree_type_non_common);
6285 type_hash_add (hashcode, type);
6290 /* See if the data pointed to by the type hash table is marked. We consider
6291 it marked if the type is marked or if a debug type number or symbol
6292 table entry has been made for the type. */
6295 type_hash_marked_p (const void *p)
6297 const_tree const type = ((const struct type_hash *) p)->type;
6299 return ggc_marked_p (type);
6303 print_type_hash_statistics (void)
6305 fprintf (stderr, "Type hash: size %ld, %ld elements, %f collisions\n",
6306 (long) htab_size (type_hash_table),
6307 (long) htab_elements (type_hash_table),
6308 htab_collisions (type_hash_table));
6311 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
6312 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
6313 by adding the hash codes of the individual attributes. */
6316 attribute_hash_list (const_tree list, hashval_t hashcode)
6320 for (tail = list; tail; tail = TREE_CHAIN (tail))
6321 /* ??? Do we want to add in TREE_VALUE too? */
6322 hashcode = iterative_hash_object
6323 (IDENTIFIER_HASH_VALUE (TREE_PURPOSE (tail)), hashcode);
6327 /* Given two lists of attributes, return true if list l2 is
6328 equivalent to l1. */
6331 attribute_list_equal (const_tree l1, const_tree l2)
6336 return attribute_list_contained (l1, l2)
6337 && attribute_list_contained (l2, l1);
6340 /* Given two lists of attributes, return true if list L2 is
6341 completely contained within L1. */
6342 /* ??? This would be faster if attribute names were stored in a canonicalized
6343 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
6344 must be used to show these elements are equivalent (which they are). */
6345 /* ??? It's not clear that attributes with arguments will always be handled
6349 attribute_list_contained (const_tree l1, const_tree l2)
6353 /* First check the obvious, maybe the lists are identical. */
6357 /* Maybe the lists are similar. */
6358 for (t1 = l1, t2 = l2;
6360 && TREE_PURPOSE (t1) == TREE_PURPOSE (t2)
6361 && TREE_VALUE (t1) == TREE_VALUE (t2);
6362 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
6365 /* Maybe the lists are equal. */
6366 if (t1 == 0 && t2 == 0)
6369 for (; t2 != 0; t2 = TREE_CHAIN (t2))
6372 /* This CONST_CAST is okay because lookup_attribute does not
6373 modify its argument and the return value is assigned to a
6375 for (attr = lookup_ident_attribute (TREE_PURPOSE (t2), CONST_CAST_TREE(l1));
6376 attr != NULL_TREE && !attribute_value_equal (t2, attr);
6377 attr = lookup_ident_attribute (TREE_PURPOSE (t2), TREE_CHAIN (attr)))
6380 if (attr == NULL_TREE)
6387 /* Given two lists of types
6388 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
6389 return 1 if the lists contain the same types in the same order.
6390 Also, the TREE_PURPOSEs must match. */
6393 type_list_equal (const_tree l1, const_tree l2)
6397 for (t1 = l1, t2 = l2; t1 && t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
6398 if (TREE_VALUE (t1) != TREE_VALUE (t2)
6399 || (TREE_PURPOSE (t1) != TREE_PURPOSE (t2)
6400 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2))
6401 && (TREE_TYPE (TREE_PURPOSE (t1))
6402 == TREE_TYPE (TREE_PURPOSE (t2))))))
6408 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
6409 given by TYPE. If the argument list accepts variable arguments,
6410 then this function counts only the ordinary arguments. */
6413 type_num_arguments (const_tree type)
6418 for (t = TYPE_ARG_TYPES (type); t; t = TREE_CHAIN (t))
6419 /* If the function does not take a variable number of arguments,
6420 the last element in the list will have type `void'. */
6421 if (VOID_TYPE_P (TREE_VALUE (t)))
6429 /* Nonzero if integer constants T1 and T2
6430 represent the same constant value. */
6433 tree_int_cst_equal (const_tree t1, const_tree t2)
6438 if (t1 == 0 || t2 == 0)
6441 if (TREE_CODE (t1) == INTEGER_CST
6442 && TREE_CODE (t2) == INTEGER_CST
6443 && TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
6444 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2))
6450 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
6451 The precise way of comparison depends on their data type. */
6454 tree_int_cst_lt (const_tree t1, const_tree t2)
6459 if (TYPE_UNSIGNED (TREE_TYPE (t1)) != TYPE_UNSIGNED (TREE_TYPE (t2)))
6461 int t1_sgn = tree_int_cst_sgn (t1);
6462 int t2_sgn = tree_int_cst_sgn (t2);
6464 if (t1_sgn < t2_sgn)
6466 else if (t1_sgn > t2_sgn)
6468 /* Otherwise, both are non-negative, so we compare them as
6469 unsigned just in case one of them would overflow a signed
6472 else if (!TYPE_UNSIGNED (TREE_TYPE (t1)))
6473 return INT_CST_LT (t1, t2);
6475 return INT_CST_LT_UNSIGNED (t1, t2);
6478 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
6481 tree_int_cst_compare (const_tree t1, const_tree t2)
6483 if (tree_int_cst_lt (t1, t2))
6485 else if (tree_int_cst_lt (t2, t1))
6491 /* Return 1 if T is an INTEGER_CST that can be manipulated efficiently on
6492 the host. If POS is zero, the value can be represented in a single
6493 HOST_WIDE_INT. If POS is nonzero, the value must be non-negative and can
6494 be represented in a single unsigned HOST_WIDE_INT. */
6497 host_integerp (const_tree t, int pos)
6502 return (TREE_CODE (t) == INTEGER_CST
6503 && ((TREE_INT_CST_HIGH (t) == 0
6504 && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) >= 0)
6505 || (! pos && TREE_INT_CST_HIGH (t) == -1
6506 && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0
6507 && (!TYPE_UNSIGNED (TREE_TYPE (t))
6508 || (TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE
6509 && TYPE_IS_SIZETYPE (TREE_TYPE (t)))))
6510 || (pos && TREE_INT_CST_HIGH (t) == 0)));
6513 /* Return the HOST_WIDE_INT least significant bits of T if it is an
6514 INTEGER_CST and there is no overflow. POS is nonzero if the result must
6515 be non-negative. We must be able to satisfy the above conditions. */
6518 tree_low_cst (const_tree t, int pos)
6520 gcc_assert (host_integerp (t, pos));
6521 return TREE_INT_CST_LOW (t);
6524 /* Return the HOST_WIDE_INT least significant bits of T, a sizetype
6525 kind INTEGER_CST. This makes sure to properly sign-extend the
6529 size_low_cst (const_tree t)
6531 double_int d = tree_to_double_int (t);
6532 return double_int_sext (d, TYPE_PRECISION (TREE_TYPE (t))).low;
6535 /* Return the most significant (sign) bit of T. */
6538 tree_int_cst_sign_bit (const_tree t)
6540 unsigned bitno = TYPE_PRECISION (TREE_TYPE (t)) - 1;
6541 unsigned HOST_WIDE_INT w;
6543 if (bitno < HOST_BITS_PER_WIDE_INT)
6544 w = TREE_INT_CST_LOW (t);
6547 w = TREE_INT_CST_HIGH (t);
6548 bitno -= HOST_BITS_PER_WIDE_INT;
6551 return (w >> bitno) & 1;
6554 /* Return an indication of the sign of the integer constant T.
6555 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
6556 Note that -1 will never be returned if T's type is unsigned. */
6559 tree_int_cst_sgn (const_tree t)
6561 if (TREE_INT_CST_LOW (t) == 0 && TREE_INT_CST_HIGH (t) == 0)
6563 else if (TYPE_UNSIGNED (TREE_TYPE (t)))
6565 else if (TREE_INT_CST_HIGH (t) < 0)
6571 /* Return the minimum number of bits needed to represent VALUE in a
6572 signed or unsigned type, UNSIGNEDP says which. */
6575 tree_int_cst_min_precision (tree value, bool unsignedp)
6579 /* If the value is negative, compute its negative minus 1. The latter
6580 adjustment is because the absolute value of the largest negative value
6581 is one larger than the largest positive value. This is equivalent to
6582 a bit-wise negation, so use that operation instead. */
6584 if (tree_int_cst_sgn (value) < 0)
6585 value = fold_build1 (BIT_NOT_EXPR, TREE_TYPE (value), value);
6587 /* Return the number of bits needed, taking into account the fact
6588 that we need one more bit for a signed than unsigned type. */
6590 if (integer_zerop (value))
6593 log = tree_floor_log2 (value);
6595 return log + 1 + !unsignedp;
6598 /* Compare two constructor-element-type constants. Return 1 if the lists
6599 are known to be equal; otherwise return 0. */
6602 simple_cst_list_equal (const_tree l1, const_tree l2)
6604 while (l1 != NULL_TREE && l2 != NULL_TREE)
6606 if (simple_cst_equal (TREE_VALUE (l1), TREE_VALUE (l2)) != 1)
6609 l1 = TREE_CHAIN (l1);
6610 l2 = TREE_CHAIN (l2);
6616 /* Return truthvalue of whether T1 is the same tree structure as T2.
6617 Return 1 if they are the same.
6618 Return 0 if they are understandably different.
6619 Return -1 if either contains tree structure not understood by
6623 simple_cst_equal (const_tree t1, const_tree t2)
6625 enum tree_code code1, code2;
6631 if (t1 == 0 || t2 == 0)
6634 code1 = TREE_CODE (t1);
6635 code2 = TREE_CODE (t2);
6637 if (CONVERT_EXPR_CODE_P (code1) || code1 == NON_LVALUE_EXPR)
6639 if (CONVERT_EXPR_CODE_P (code2)
6640 || code2 == NON_LVALUE_EXPR)
6641 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
6643 return simple_cst_equal (TREE_OPERAND (t1, 0), t2);
6646 else if (CONVERT_EXPR_CODE_P (code2)
6647 || code2 == NON_LVALUE_EXPR)
6648 return simple_cst_equal (t1, TREE_OPERAND (t2, 0));
6656 return (TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
6657 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2));
6660 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
6663 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));
6666 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
6667 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
6668 TREE_STRING_LENGTH (t1)));
6672 unsigned HOST_WIDE_INT idx;
6673 VEC(constructor_elt, gc) *v1 = CONSTRUCTOR_ELTS (t1);
6674 VEC(constructor_elt, gc) *v2 = CONSTRUCTOR_ELTS (t2);
6676 if (VEC_length (constructor_elt, v1) != VEC_length (constructor_elt, v2))
6679 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
6680 /* ??? Should we handle also fields here? */
6681 if (!simple_cst_equal (VEC_index (constructor_elt, v1, idx)->value,
6682 VEC_index (constructor_elt, v2, idx)->value))
6688 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
6691 cmp = simple_cst_equal (CALL_EXPR_FN (t1), CALL_EXPR_FN (t2));
6694 if (call_expr_nargs (t1) != call_expr_nargs (t2))
6697 const_tree arg1, arg2;
6698 const_call_expr_arg_iterator iter1, iter2;
6699 for (arg1 = first_const_call_expr_arg (t1, &iter1),
6700 arg2 = first_const_call_expr_arg (t2, &iter2);
6702 arg1 = next_const_call_expr_arg (&iter1),
6703 arg2 = next_const_call_expr_arg (&iter2))
6705 cmp = simple_cst_equal (arg1, arg2);
6709 return arg1 == arg2;
6713 /* Special case: if either target is an unallocated VAR_DECL,
6714 it means that it's going to be unified with whatever the
6715 TARGET_EXPR is really supposed to initialize, so treat it
6716 as being equivalent to anything. */
6717 if ((TREE_CODE (TREE_OPERAND (t1, 0)) == VAR_DECL
6718 && DECL_NAME (TREE_OPERAND (t1, 0)) == NULL_TREE
6719 && !DECL_RTL_SET_P (TREE_OPERAND (t1, 0)))
6720 || (TREE_CODE (TREE_OPERAND (t2, 0)) == VAR_DECL
6721 && DECL_NAME (TREE_OPERAND (t2, 0)) == NULL_TREE
6722 && !DECL_RTL_SET_P (TREE_OPERAND (t2, 0))))
6725 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
6730 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
6732 case WITH_CLEANUP_EXPR:
6733 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
6737 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t1, 1));
6740 if (TREE_OPERAND (t1, 1) == TREE_OPERAND (t2, 1))
6741 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
6755 /* This general rule works for most tree codes. All exceptions should be
6756 handled above. If this is a language-specific tree code, we can't
6757 trust what might be in the operand, so say we don't know
6759 if ((int) code1 >= (int) LAST_AND_UNUSED_TREE_CODE)
6762 switch (TREE_CODE_CLASS (code1))
6766 case tcc_comparison:
6767 case tcc_expression:
6771 for (i = 0; i < TREE_CODE_LENGTH (code1); i++)
6773 cmp = simple_cst_equal (TREE_OPERAND (t1, i), TREE_OPERAND (t2, i));
6785 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
6786 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
6787 than U, respectively. */
6790 compare_tree_int (const_tree t, unsigned HOST_WIDE_INT u)
6792 if (tree_int_cst_sgn (t) < 0)
6794 else if (TREE_INT_CST_HIGH (t) != 0)
6796 else if (TREE_INT_CST_LOW (t) == u)
6798 else if (TREE_INT_CST_LOW (t) < u)
6804 /* Return true if CODE represents an associative tree code. Otherwise
6807 associative_tree_code (enum tree_code code)
6826 /* Return true if CODE represents a commutative tree code. Otherwise
6829 commutative_tree_code (enum tree_code code)
6842 case UNORDERED_EXPR:
6846 case TRUTH_AND_EXPR:
6847 case TRUTH_XOR_EXPR:
6857 /* Return true if CODE represents a ternary tree code for which the
6858 first two operands are commutative. Otherwise return false. */
6860 commutative_ternary_tree_code (enum tree_code code)
6864 case WIDEN_MULT_PLUS_EXPR:
6865 case WIDEN_MULT_MINUS_EXPR:
6874 /* Generate a hash value for an expression. This can be used iteratively
6875 by passing a previous result as the VAL argument.
6877 This function is intended to produce the same hash for expressions which
6878 would compare equal using operand_equal_p. */
6881 iterative_hash_expr (const_tree t, hashval_t val)
6884 enum tree_code code;
6888 return iterative_hash_hashval_t (0, val);
6890 code = TREE_CODE (t);
6894 /* Alas, constants aren't shared, so we can't rely on pointer
6897 val = iterative_hash_host_wide_int (TREE_INT_CST_LOW (t), val);
6898 return iterative_hash_host_wide_int (TREE_INT_CST_HIGH (t), val);
6901 unsigned int val2 = real_hash (TREE_REAL_CST_PTR (t));
6903 return iterative_hash_hashval_t (val2, val);
6907 unsigned int val2 = fixed_hash (TREE_FIXED_CST_PTR (t));
6909 return iterative_hash_hashval_t (val2, val);
6912 return iterative_hash (TREE_STRING_POINTER (t),
6913 TREE_STRING_LENGTH (t), val);
6915 val = iterative_hash_expr (TREE_REALPART (t), val);
6916 return iterative_hash_expr (TREE_IMAGPART (t), val);
6918 return iterative_hash_expr (TREE_VECTOR_CST_ELTS (t), val);
6920 /* We can just compare by pointer. */
6921 return iterative_hash_host_wide_int (SSA_NAME_VERSION (t), val);
6922 case PLACEHOLDER_EXPR:
6923 /* The node itself doesn't matter. */
6926 /* A list of expressions, for a CALL_EXPR or as the elements of a
6928 for (; t; t = TREE_CHAIN (t))
6929 val = iterative_hash_expr (TREE_VALUE (t), val);
6933 unsigned HOST_WIDE_INT idx;
6935 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (t), idx, field, value)
6937 val = iterative_hash_expr (field, val);
6938 val = iterative_hash_expr (value, val);
6944 /* The type of the second operand is relevant, except for
6945 its top-level qualifiers. */
6946 tree type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (t, 1)));
6948 val = iterative_hash_object (TYPE_HASH (type), val);
6950 /* We could use the standard hash computation from this point
6952 val = iterative_hash_object (code, val);
6953 val = iterative_hash_expr (TREE_OPERAND (t, 1), val);
6954 val = iterative_hash_expr (TREE_OPERAND (t, 0), val);
6958 /* When referring to a built-in FUNCTION_DECL, use the __builtin__ form.
6959 Otherwise nodes that compare equal according to operand_equal_p might
6960 get different hash codes. However, don't do this for machine specific
6961 or front end builtins, since the function code is overloaded in those
6963 if (DECL_BUILT_IN_CLASS (t) == BUILT_IN_NORMAL
6964 && builtin_decl_explicit_p (DECL_FUNCTION_CODE (t)))
6966 t = builtin_decl_explicit (DECL_FUNCTION_CODE (t));
6967 code = TREE_CODE (t);
6971 tclass = TREE_CODE_CLASS (code);
6973 if (tclass == tcc_declaration)
6975 /* DECL's have a unique ID */
6976 val = iterative_hash_host_wide_int (DECL_UID (t), val);
6980 gcc_assert (IS_EXPR_CODE_CLASS (tclass));
6982 val = iterative_hash_object (code, val);
6984 /* Don't hash the type, that can lead to having nodes which
6985 compare equal according to operand_equal_p, but which
6986 have different hash codes. */
6987 if (CONVERT_EXPR_CODE_P (code)
6988 || code == NON_LVALUE_EXPR)
6990 /* Make sure to include signness in the hash computation. */
6991 val += TYPE_UNSIGNED (TREE_TYPE (t));
6992 val = iterative_hash_expr (TREE_OPERAND (t, 0), val);
6995 else if (commutative_tree_code (code))
6997 /* It's a commutative expression. We want to hash it the same
6998 however it appears. We do this by first hashing both operands
6999 and then rehashing based on the order of their independent
7001 hashval_t one = iterative_hash_expr (TREE_OPERAND (t, 0), 0);
7002 hashval_t two = iterative_hash_expr (TREE_OPERAND (t, 1), 0);
7006 t = one, one = two, two = t;
7008 val = iterative_hash_hashval_t (one, val);
7009 val = iterative_hash_hashval_t (two, val);
7012 for (i = TREE_OPERAND_LENGTH (t) - 1; i >= 0; --i)
7013 val = iterative_hash_expr (TREE_OPERAND (t, i), val);
7019 /* Generate a hash value for a pair of expressions. This can be used
7020 iteratively by passing a previous result as the VAL argument.
7022 The same hash value is always returned for a given pair of expressions,
7023 regardless of the order in which they are presented. This is useful in
7024 hashing the operands of commutative functions. */
7027 iterative_hash_exprs_commutative (const_tree t1,
7028 const_tree t2, hashval_t val)
7030 hashval_t one = iterative_hash_expr (t1, 0);
7031 hashval_t two = iterative_hash_expr (t2, 0);
7035 t = one, one = two, two = t;
7036 val = iterative_hash_hashval_t (one, val);
7037 val = iterative_hash_hashval_t (two, val);
7042 /* Constructors for pointer, array and function types.
7043 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
7044 constructed by language-dependent code, not here.) */
7046 /* Construct, lay out and return the type of pointers to TO_TYPE with
7047 mode MODE. If CAN_ALIAS_ALL is TRUE, indicate this type can
7048 reference all of memory. If such a type has already been
7049 constructed, reuse it. */
7052 build_pointer_type_for_mode (tree to_type, enum machine_mode mode,
7057 if (to_type == error_mark_node)
7058 return error_mark_node;
7060 /* If the pointed-to type has the may_alias attribute set, force
7061 a TYPE_REF_CAN_ALIAS_ALL pointer to be generated. */
7062 if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (to_type)))
7063 can_alias_all = true;
7065 /* In some cases, languages will have things that aren't a POINTER_TYPE
7066 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_POINTER_TO.
7067 In that case, return that type without regard to the rest of our
7070 ??? This is a kludge, but consistent with the way this function has
7071 always operated and there doesn't seem to be a good way to avoid this
7073 if (TYPE_POINTER_TO (to_type) != 0
7074 && TREE_CODE (TYPE_POINTER_TO (to_type)) != POINTER_TYPE)
7075 return TYPE_POINTER_TO (to_type);
7077 /* First, if we already have a type for pointers to TO_TYPE and it's
7078 the proper mode, use it. */
7079 for (t = TYPE_POINTER_TO (to_type); t; t = TYPE_NEXT_PTR_TO (t))
7080 if (TYPE_MODE (t) == mode && TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
7083 t = make_node (POINTER_TYPE);
7085 TREE_TYPE (t) = to_type;
7086 SET_TYPE_MODE (t, mode);
7087 TYPE_REF_CAN_ALIAS_ALL (t) = can_alias_all;
7088 TYPE_NEXT_PTR_TO (t) = TYPE_POINTER_TO (to_type);
7089 TYPE_POINTER_TO (to_type) = t;
7091 if (TYPE_STRUCTURAL_EQUALITY_P (to_type))
7092 SET_TYPE_STRUCTURAL_EQUALITY (t);
7093 else if (TYPE_CANONICAL (to_type) != to_type)
7095 = build_pointer_type_for_mode (TYPE_CANONICAL (to_type),
7096 mode, can_alias_all);
7098 /* Lay out the type. This function has many callers that are concerned
7099 with expression-construction, and this simplifies them all. */
7105 /* By default build pointers in ptr_mode. */
7108 build_pointer_type (tree to_type)
7110 addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC
7111 : TYPE_ADDR_SPACE (to_type);
7112 enum machine_mode pointer_mode = targetm.addr_space.pointer_mode (as);
7113 return build_pointer_type_for_mode (to_type, pointer_mode, false);
7116 /* Same as build_pointer_type_for_mode, but for REFERENCE_TYPE. */
7119 build_reference_type_for_mode (tree to_type, enum machine_mode mode,
7124 if (to_type == error_mark_node)
7125 return error_mark_node;
7127 /* If the pointed-to type has the may_alias attribute set, force
7128 a TYPE_REF_CAN_ALIAS_ALL pointer to be generated. */
7129 if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (to_type)))
7130 can_alias_all = true;
7132 /* In some cases, languages will have things that aren't a REFERENCE_TYPE
7133 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_REFERENCE_TO.
7134 In that case, return that type without regard to the rest of our
7137 ??? This is a kludge, but consistent with the way this function has
7138 always operated and there doesn't seem to be a good way to avoid this
7140 if (TYPE_REFERENCE_TO (to_type) != 0
7141 && TREE_CODE (TYPE_REFERENCE_TO (to_type)) != REFERENCE_TYPE)
7142 return TYPE_REFERENCE_TO (to_type);
7144 /* First, if we already have a type for pointers to TO_TYPE and it's
7145 the proper mode, use it. */
7146 for (t = TYPE_REFERENCE_TO (to_type); t; t = TYPE_NEXT_REF_TO (t))
7147 if (TYPE_MODE (t) == mode && TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
7150 t = make_node (REFERENCE_TYPE);
7152 TREE_TYPE (t) = to_type;
7153 SET_TYPE_MODE (t, mode);
7154 TYPE_REF_CAN_ALIAS_ALL (t) = can_alias_all;
7155 TYPE_NEXT_REF_TO (t) = TYPE_REFERENCE_TO (to_type);
7156 TYPE_REFERENCE_TO (to_type) = t;
7158 if (TYPE_STRUCTURAL_EQUALITY_P (to_type))
7159 SET_TYPE_STRUCTURAL_EQUALITY (t);
7160 else if (TYPE_CANONICAL (to_type) != to_type)
7162 = build_reference_type_for_mode (TYPE_CANONICAL (to_type),
7163 mode, can_alias_all);
7171 /* Build the node for the type of references-to-TO_TYPE by default
7175 build_reference_type (tree to_type)
7177 addr_space_t as = to_type == error_mark_node? ADDR_SPACE_GENERIC
7178 : TYPE_ADDR_SPACE (to_type);
7179 enum machine_mode pointer_mode = targetm.addr_space.pointer_mode (as);
7180 return build_reference_type_for_mode (to_type, pointer_mode, false);
7183 /* Build a type that is compatible with t but has no cv quals anywhere
7186 const char *const *const * -> char ***. */
7189 build_type_no_quals (tree t)
7191 switch (TREE_CODE (t))
7194 return build_pointer_type_for_mode (build_type_no_quals (TREE_TYPE (t)),
7196 TYPE_REF_CAN_ALIAS_ALL (t));
7197 case REFERENCE_TYPE:
7199 build_reference_type_for_mode (build_type_no_quals (TREE_TYPE (t)),
7201 TYPE_REF_CAN_ALIAS_ALL (t));
7203 return TYPE_MAIN_VARIANT (t);
7207 #define MAX_INT_CACHED_PREC \
7208 (HOST_BITS_PER_WIDE_INT > 64 ? HOST_BITS_PER_WIDE_INT : 64)
7209 static GTY(()) tree nonstandard_integer_type_cache[2 * MAX_INT_CACHED_PREC + 2];
7211 /* Builds a signed or unsigned integer type of precision PRECISION.
7212 Used for C bitfields whose precision does not match that of
7213 built-in target types. */
7215 build_nonstandard_integer_type (unsigned HOST_WIDE_INT precision,
7221 unsignedp = MAX_INT_CACHED_PREC + 1;
7223 if (precision <= MAX_INT_CACHED_PREC)
7225 itype = nonstandard_integer_type_cache[precision + unsignedp];
7230 itype = make_node (INTEGER_TYPE);
7231 TYPE_PRECISION (itype) = precision;
7234 fixup_unsigned_type (itype);
7236 fixup_signed_type (itype);
7239 if (host_integerp (TYPE_MAX_VALUE (itype), 1))
7240 ret = type_hash_canon (tree_low_cst (TYPE_MAX_VALUE (itype), 1), itype);
7241 if (precision <= MAX_INT_CACHED_PREC)
7242 nonstandard_integer_type_cache[precision + unsignedp] = ret;
7247 /* Create a range of some discrete type TYPE (an INTEGER_TYPE, ENUMERAL_TYPE
7248 or BOOLEAN_TYPE) with low bound LOWVAL and high bound HIGHVAL. If SHARED
7249 is true, reuse such a type that has already been constructed. */
7252 build_range_type_1 (tree type, tree lowval, tree highval, bool shared)
7254 tree itype = make_node (INTEGER_TYPE);
7255 hashval_t hashcode = 0;
7257 TREE_TYPE (itype) = type;
7259 TYPE_MIN_VALUE (itype) = fold_convert (type, lowval);
7260 TYPE_MAX_VALUE (itype) = highval ? fold_convert (type, highval) : NULL;
7262 TYPE_PRECISION (itype) = TYPE_PRECISION (type);
7263 SET_TYPE_MODE (itype, TYPE_MODE (type));
7264 TYPE_SIZE (itype) = TYPE_SIZE (type);
7265 TYPE_SIZE_UNIT (itype) = TYPE_SIZE_UNIT (type);
7266 TYPE_ALIGN (itype) = TYPE_ALIGN (type);
7267 TYPE_USER_ALIGN (itype) = TYPE_USER_ALIGN (type);
7272 if ((TYPE_MIN_VALUE (itype)
7273 && TREE_CODE (TYPE_MIN_VALUE (itype)) != INTEGER_CST)
7274 || (TYPE_MAX_VALUE (itype)
7275 && TREE_CODE (TYPE_MAX_VALUE (itype)) != INTEGER_CST))
7277 /* Since we cannot reliably merge this type, we need to compare it using
7278 structural equality checks. */
7279 SET_TYPE_STRUCTURAL_EQUALITY (itype);
7283 hashcode = iterative_hash_expr (TYPE_MIN_VALUE (itype), hashcode);
7284 hashcode = iterative_hash_expr (TYPE_MAX_VALUE (itype), hashcode);
7285 hashcode = iterative_hash_hashval_t (TYPE_HASH (type), hashcode);
7286 itype = type_hash_canon (hashcode, itype);
7291 /* Wrapper around build_range_type_1 with SHARED set to true. */
7294 build_range_type (tree type, tree lowval, tree highval)
7296 return build_range_type_1 (type, lowval, highval, true);
7299 /* Wrapper around build_range_type_1 with SHARED set to false. */
7302 build_nonshared_range_type (tree type, tree lowval, tree highval)
7304 return build_range_type_1 (type, lowval, highval, false);
7307 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
7308 MAXVAL should be the maximum value in the domain
7309 (one less than the length of the array).
7311 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
7312 We don't enforce this limit, that is up to caller (e.g. language front end).
7313 The limit exists because the result is a signed type and we don't handle
7314 sizes that use more than one HOST_WIDE_INT. */
7317 build_index_type (tree maxval)
7319 return build_range_type (sizetype, size_zero_node, maxval);
7322 /* Return true if the debug information for TYPE, a subtype, should be emitted
7323 as a subrange type. If so, set LOWVAL to the low bound and HIGHVAL to the
7324 high bound, respectively. Sometimes doing so unnecessarily obfuscates the
7325 debug info and doesn't reflect the source code. */
7328 subrange_type_for_debug_p (const_tree type, tree *lowval, tree *highval)
7330 tree base_type = TREE_TYPE (type), low, high;
7332 /* Subrange types have a base type which is an integral type. */
7333 if (!INTEGRAL_TYPE_P (base_type))
7336 /* Get the real bounds of the subtype. */
7337 if (lang_hooks.types.get_subrange_bounds)
7338 lang_hooks.types.get_subrange_bounds (type, &low, &high);
7341 low = TYPE_MIN_VALUE (type);
7342 high = TYPE_MAX_VALUE (type);
7345 /* If the type and its base type have the same representation and the same
7346 name, then the type is not a subrange but a copy of the base type. */
7347 if ((TREE_CODE (base_type) == INTEGER_TYPE
7348 || TREE_CODE (base_type) == BOOLEAN_TYPE)
7349 && int_size_in_bytes (type) == int_size_in_bytes (base_type)
7350 && tree_int_cst_equal (low, TYPE_MIN_VALUE (base_type))
7351 && tree_int_cst_equal (high, TYPE_MAX_VALUE (base_type)))
7353 tree type_name = TYPE_NAME (type);
7354 tree base_type_name = TYPE_NAME (base_type);
7356 if (type_name && TREE_CODE (type_name) == TYPE_DECL)
7357 type_name = DECL_NAME (type_name);
7359 if (base_type_name && TREE_CODE (base_type_name) == TYPE_DECL)
7360 base_type_name = DECL_NAME (base_type_name);
7362 if (type_name == base_type_name)
7373 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
7374 and number of elements specified by the range of values of INDEX_TYPE.
7375 If SHARED is true, reuse such a type that has already been constructed. */
7378 build_array_type_1 (tree elt_type, tree index_type, bool shared)
7382 if (TREE_CODE (elt_type) == FUNCTION_TYPE)
7384 error ("arrays of functions are not meaningful");
7385 elt_type = integer_type_node;
7388 t = make_node (ARRAY_TYPE);
7389 TREE_TYPE (t) = elt_type;
7390 TYPE_DOMAIN (t) = index_type;
7391 TYPE_ADDR_SPACE (t) = TYPE_ADDR_SPACE (elt_type);
7394 /* If the element type is incomplete at this point we get marked for
7395 structural equality. Do not record these types in the canonical
7397 if (TYPE_STRUCTURAL_EQUALITY_P (t))
7402 hashval_t hashcode = iterative_hash_object (TYPE_HASH (elt_type), 0);
7404 hashcode = iterative_hash_object (TYPE_HASH (index_type), hashcode);
7405 t = type_hash_canon (hashcode, t);
7408 if (TYPE_CANONICAL (t) == t)
7410 if (TYPE_STRUCTURAL_EQUALITY_P (elt_type)
7411 || (index_type && TYPE_STRUCTURAL_EQUALITY_P (index_type)))
7412 SET_TYPE_STRUCTURAL_EQUALITY (t);
7413 else if (TYPE_CANONICAL (elt_type) != elt_type
7414 || (index_type && TYPE_CANONICAL (index_type) != index_type))
7416 = build_array_type_1 (TYPE_CANONICAL (elt_type),
7418 ? TYPE_CANONICAL (index_type) : NULL_TREE,
7425 /* Wrapper around build_array_type_1 with SHARED set to true. */
7428 build_array_type (tree elt_type, tree index_type)
7430 return build_array_type_1 (elt_type, index_type, true);
7433 /* Wrapper around build_array_type_1 with SHARED set to false. */
7436 build_nonshared_array_type (tree elt_type, tree index_type)
7438 return build_array_type_1 (elt_type, index_type, false);
7441 /* Return a representation of ELT_TYPE[NELTS], using indices of type
7445 build_array_type_nelts (tree elt_type, unsigned HOST_WIDE_INT nelts)
7447 return build_array_type (elt_type, build_index_type (size_int (nelts - 1)));
7450 /* Recursively examines the array elements of TYPE, until a non-array
7451 element type is found. */
7454 strip_array_types (tree type)
7456 while (TREE_CODE (type) == ARRAY_TYPE)
7457 type = TREE_TYPE (type);
7462 /* Computes the canonical argument types from the argument type list
7465 Upon return, *ANY_STRUCTURAL_P will be true iff either it was true
7466 on entry to this function, or if any of the ARGTYPES are
7469 Upon return, *ANY_NONCANONICAL_P will be true iff either it was
7470 true on entry to this function, or if any of the ARGTYPES are
7473 Returns a canonical argument list, which may be ARGTYPES when the
7474 canonical argument list is unneeded (i.e., *ANY_STRUCTURAL_P is
7475 true) or would not differ from ARGTYPES. */
7478 maybe_canonicalize_argtypes(tree argtypes,
7479 bool *any_structural_p,
7480 bool *any_noncanonical_p)
7483 bool any_noncanonical_argtypes_p = false;
7485 for (arg = argtypes; arg && !(*any_structural_p); arg = TREE_CHAIN (arg))
7487 if (!TREE_VALUE (arg) || TREE_VALUE (arg) == error_mark_node)
7488 /* Fail gracefully by stating that the type is structural. */
7489 *any_structural_p = true;
7490 else if (TYPE_STRUCTURAL_EQUALITY_P (TREE_VALUE (arg)))
7491 *any_structural_p = true;
7492 else if (TYPE_CANONICAL (TREE_VALUE (arg)) != TREE_VALUE (arg)
7493 || TREE_PURPOSE (arg))
7494 /* If the argument has a default argument, we consider it
7495 non-canonical even though the type itself is canonical.
7496 That way, different variants of function and method types
7497 with default arguments will all point to the variant with
7498 no defaults as their canonical type. */
7499 any_noncanonical_argtypes_p = true;
7502 if (*any_structural_p)
7505 if (any_noncanonical_argtypes_p)
7507 /* Build the canonical list of argument types. */
7508 tree canon_argtypes = NULL_TREE;
7509 bool is_void = false;
7511 for (arg = argtypes; arg; arg = TREE_CHAIN (arg))
7513 if (arg == void_list_node)
7516 canon_argtypes = tree_cons (NULL_TREE,
7517 TYPE_CANONICAL (TREE_VALUE (arg)),
7521 canon_argtypes = nreverse (canon_argtypes);
7523 canon_argtypes = chainon (canon_argtypes, void_list_node);
7525 /* There is a non-canonical type. */
7526 *any_noncanonical_p = true;
7527 return canon_argtypes;
7530 /* The canonical argument types are the same as ARGTYPES. */
7534 /* Construct, lay out and return
7535 the type of functions returning type VALUE_TYPE
7536 given arguments of types ARG_TYPES.
7537 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
7538 are data type nodes for the arguments of the function.
7539 If such a type has already been constructed, reuse it. */
7542 build_function_type (tree value_type, tree arg_types)
7545 hashval_t hashcode = 0;
7546 bool any_structural_p, any_noncanonical_p;
7547 tree canon_argtypes;
7549 if (TREE_CODE (value_type) == FUNCTION_TYPE)
7551 error ("function return type cannot be function");
7552 value_type = integer_type_node;
7555 /* Make a node of the sort we want. */
7556 t = make_node (FUNCTION_TYPE);
7557 TREE_TYPE (t) = value_type;
7558 TYPE_ARG_TYPES (t) = arg_types;
7560 /* If we already have such a type, use the old one. */
7561 hashcode = iterative_hash_object (TYPE_HASH (value_type), hashcode);
7562 hashcode = type_hash_list (arg_types, hashcode);
7563 t = type_hash_canon (hashcode, t);
7565 /* Set up the canonical type. */
7566 any_structural_p = TYPE_STRUCTURAL_EQUALITY_P (value_type);
7567 any_noncanonical_p = TYPE_CANONICAL (value_type) != value_type;
7568 canon_argtypes = maybe_canonicalize_argtypes (arg_types,
7570 &any_noncanonical_p);
7571 if (any_structural_p)
7572 SET_TYPE_STRUCTURAL_EQUALITY (t);
7573 else if (any_noncanonical_p)
7574 TYPE_CANONICAL (t) = build_function_type (TYPE_CANONICAL (value_type),
7577 if (!COMPLETE_TYPE_P (t))
7582 /* Build variant of function type ORIG_TYPE skipping ARGS_TO_SKIP and the
7583 return value if SKIP_RETURN is true. */
7586 build_function_type_skip_args (tree orig_type, bitmap args_to_skip,
7589 tree new_type = NULL;
7590 tree args, new_args = NULL, t;
7594 for (args = TYPE_ARG_TYPES (orig_type); args && args != void_list_node;
7595 args = TREE_CHAIN (args), i++)
7596 if (!args_to_skip || !bitmap_bit_p (args_to_skip, i))
7597 new_args = tree_cons (NULL_TREE, TREE_VALUE (args), new_args);
7599 new_reversed = nreverse (new_args);
7603 TREE_CHAIN (new_args) = void_list_node;
7605 new_reversed = void_list_node;
7608 /* Use copy_node to preserve as much as possible from original type
7609 (debug info, attribute lists etc.)
7610 Exception is METHOD_TYPEs must have THIS argument.
7611 When we are asked to remove it, we need to build new FUNCTION_TYPE
7613 if (TREE_CODE (orig_type) != METHOD_TYPE
7615 || !bitmap_bit_p (args_to_skip, 0))
7617 new_type = build_distinct_type_copy (orig_type);
7618 TYPE_ARG_TYPES (new_type) = new_reversed;
7623 = build_distinct_type_copy (build_function_type (TREE_TYPE (orig_type),
7625 TYPE_CONTEXT (new_type) = TYPE_CONTEXT (orig_type);
7629 TREE_TYPE (new_type) = void_type_node;
7631 /* This is a new type, not a copy of an old type. Need to reassociate
7632 variants. We can handle everything except the main variant lazily. */
7633 t = TYPE_MAIN_VARIANT (orig_type);
7636 t = build_function_type_skip_args (t, args_to_skip, skip_return);
7637 TYPE_MAIN_VARIANT (new_type) = t;
7638 TYPE_NEXT_VARIANT (new_type) = TYPE_NEXT_VARIANT (t);
7639 TYPE_NEXT_VARIANT (t) = new_type;
7643 TYPE_MAIN_VARIANT (new_type) = new_type;
7644 TYPE_NEXT_VARIANT (new_type) = NULL;
7650 /* Build variant of function decl ORIG_DECL skipping ARGS_TO_SKIP and the
7651 return value if SKIP_RETURN is true.
7653 Arguments from DECL_ARGUMENTS list can't be removed now, since they are
7654 linked by TREE_CHAIN directly. The caller is responsible for eliminating
7655 them when they are being duplicated (i.e. copy_arguments_for_versioning). */
7658 build_function_decl_skip_args (tree orig_decl, bitmap args_to_skip,
7661 tree new_decl = copy_node (orig_decl);
7664 new_type = TREE_TYPE (orig_decl);
7665 if (prototype_p (new_type)
7666 || (skip_return && !VOID_TYPE_P (TREE_TYPE (new_type))))
7668 = build_function_type_skip_args (new_type, args_to_skip, skip_return);
7669 TREE_TYPE (new_decl) = new_type;
7671 /* For declarations setting DECL_VINDEX (i.e. methods)
7672 we expect first argument to be THIS pointer. */
7673 if (args_to_skip && bitmap_bit_p (args_to_skip, 0))
7674 DECL_VINDEX (new_decl) = NULL_TREE;
7676 /* When signature changes, we need to clear builtin info. */
7677 if (DECL_BUILT_IN (new_decl)
7679 && !bitmap_empty_p (args_to_skip))
7681 DECL_BUILT_IN_CLASS (new_decl) = NOT_BUILT_IN;
7682 DECL_FUNCTION_CODE (new_decl) = (enum built_in_function) 0;
7687 /* Build a function type. The RETURN_TYPE is the type returned by the
7688 function. If VAARGS is set, no void_type_node is appended to the
7689 the list. ARGP must be always be terminated be a NULL_TREE. */
7692 build_function_type_list_1 (bool vaargs, tree return_type, va_list argp)
7696 t = va_arg (argp, tree);
7697 for (args = NULL_TREE; t != NULL_TREE; t = va_arg (argp, tree))
7698 args = tree_cons (NULL_TREE, t, args);
7703 if (args != NULL_TREE)
7704 args = nreverse (args);
7705 gcc_assert (last != void_list_node);
7707 else if (args == NULL_TREE)
7708 args = void_list_node;
7712 args = nreverse (args);
7713 TREE_CHAIN (last) = void_list_node;
7715 args = build_function_type (return_type, args);
7720 /* Build a function type. The RETURN_TYPE is the type returned by the
7721 function. If additional arguments are provided, they are
7722 additional argument types. The list of argument types must always
7723 be terminated by NULL_TREE. */
7726 build_function_type_list (tree return_type, ...)
7731 va_start (p, return_type);
7732 args = build_function_type_list_1 (false, return_type, p);
7737 /* Build a variable argument function type. The RETURN_TYPE is the
7738 type returned by the function. If additional arguments are provided,
7739 they are additional argument types. The list of argument types must
7740 always be terminated by NULL_TREE. */
7743 build_varargs_function_type_list (tree return_type, ...)
7748 va_start (p, return_type);
7749 args = build_function_type_list_1 (true, return_type, p);
7755 /* Build a function type. RETURN_TYPE is the type returned by the
7756 function; VAARGS indicates whether the function takes varargs. The
7757 function takes N named arguments, the types of which are provided in
7761 build_function_type_array_1 (bool vaargs, tree return_type, int n,
7765 tree t = vaargs ? NULL_TREE : void_list_node;
7767 for (i = n - 1; i >= 0; i--)
7768 t = tree_cons (NULL_TREE, arg_types[i], t);
7770 return build_function_type (return_type, t);
7773 /* Build a function type. RETURN_TYPE is the type returned by the
7774 function. The function takes N named arguments, the types of which
7775 are provided in ARG_TYPES. */
7778 build_function_type_array (tree return_type, int n, tree *arg_types)
7780 return build_function_type_array_1 (false, return_type, n, arg_types);
7783 /* Build a variable argument function type. RETURN_TYPE is the type
7784 returned by the function. The function takes N named arguments, the
7785 types of which are provided in ARG_TYPES. */
7788 build_varargs_function_type_array (tree return_type, int n, tree *arg_types)
7790 return build_function_type_array_1 (true, return_type, n, arg_types);
7793 /* Build a METHOD_TYPE for a member of BASETYPE. The RETTYPE (a TYPE)
7794 and ARGTYPES (a TREE_LIST) are the return type and arguments types
7795 for the method. An implicit additional parameter (of type
7796 pointer-to-BASETYPE) is added to the ARGTYPES. */
7799 build_method_type_directly (tree basetype,
7806 bool any_structural_p, any_noncanonical_p;
7807 tree canon_argtypes;
7809 /* Make a node of the sort we want. */
7810 t = make_node (METHOD_TYPE);
7812 TYPE_METHOD_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
7813 TREE_TYPE (t) = rettype;
7814 ptype = build_pointer_type (basetype);
7816 /* The actual arglist for this function includes a "hidden" argument
7817 which is "this". Put it into the list of argument types. */
7818 argtypes = tree_cons (NULL_TREE, ptype, argtypes);
7819 TYPE_ARG_TYPES (t) = argtypes;
7821 /* If we already have such a type, use the old one. */
7822 hashcode = iterative_hash_object (TYPE_HASH (basetype), hashcode);
7823 hashcode = iterative_hash_object (TYPE_HASH (rettype), hashcode);
7824 hashcode = type_hash_list (argtypes, hashcode);
7825 t = type_hash_canon (hashcode, t);
7827 /* Set up the canonical type. */
7829 = (TYPE_STRUCTURAL_EQUALITY_P (basetype)
7830 || TYPE_STRUCTURAL_EQUALITY_P (rettype));
7832 = (TYPE_CANONICAL (basetype) != basetype
7833 || TYPE_CANONICAL (rettype) != rettype);
7834 canon_argtypes = maybe_canonicalize_argtypes (TREE_CHAIN (argtypes),
7836 &any_noncanonical_p);
7837 if (any_structural_p)
7838 SET_TYPE_STRUCTURAL_EQUALITY (t);
7839 else if (any_noncanonical_p)
7841 = build_method_type_directly (TYPE_CANONICAL (basetype),
7842 TYPE_CANONICAL (rettype),
7844 if (!COMPLETE_TYPE_P (t))
7850 /* Construct, lay out and return the type of methods belonging to class
7851 BASETYPE and whose arguments and values are described by TYPE.
7852 If that type exists already, reuse it.
7853 TYPE must be a FUNCTION_TYPE node. */
7856 build_method_type (tree basetype, tree type)
7858 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
7860 return build_method_type_directly (basetype,
7862 TYPE_ARG_TYPES (type));
7865 /* Construct, lay out and return the type of offsets to a value
7866 of type TYPE, within an object of type BASETYPE.
7867 If a suitable offset type exists already, reuse it. */
7870 build_offset_type (tree basetype, tree type)
7873 hashval_t hashcode = 0;
7875 /* Make a node of the sort we want. */
7876 t = make_node (OFFSET_TYPE);
7878 TYPE_OFFSET_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
7879 TREE_TYPE (t) = type;
7881 /* If we already have such a type, use the old one. */
7882 hashcode = iterative_hash_object (TYPE_HASH (basetype), hashcode);
7883 hashcode = iterative_hash_object (TYPE_HASH (type), hashcode);
7884 t = type_hash_canon (hashcode, t);
7886 if (!COMPLETE_TYPE_P (t))
7889 if (TYPE_CANONICAL (t) == t)
7891 if (TYPE_STRUCTURAL_EQUALITY_P (basetype)
7892 || TYPE_STRUCTURAL_EQUALITY_P (type))
7893 SET_TYPE_STRUCTURAL_EQUALITY (t);
7894 else if (TYPE_CANONICAL (TYPE_MAIN_VARIANT (basetype)) != basetype
7895 || TYPE_CANONICAL (type) != type)
7897 = build_offset_type (TYPE_CANONICAL (TYPE_MAIN_VARIANT (basetype)),
7898 TYPE_CANONICAL (type));
7904 /* Create a complex type whose components are COMPONENT_TYPE. */
7907 build_complex_type (tree component_type)
7912 gcc_assert (INTEGRAL_TYPE_P (component_type)
7913 || SCALAR_FLOAT_TYPE_P (component_type)
7914 || FIXED_POINT_TYPE_P (component_type));
7916 /* Make a node of the sort we want. */
7917 t = make_node (COMPLEX_TYPE);
7919 TREE_TYPE (t) = TYPE_MAIN_VARIANT (component_type);
7921 /* If we already have such a type, use the old one. */
7922 hashcode = iterative_hash_object (TYPE_HASH (component_type), 0);
7923 t = type_hash_canon (hashcode, t);
7925 if (!COMPLETE_TYPE_P (t))
7928 if (TYPE_CANONICAL (t) == t)
7930 if (TYPE_STRUCTURAL_EQUALITY_P (component_type))
7931 SET_TYPE_STRUCTURAL_EQUALITY (t);
7932 else if (TYPE_CANONICAL (component_type) != component_type)
7934 = build_complex_type (TYPE_CANONICAL (component_type));
7937 /* We need to create a name, since complex is a fundamental type. */
7938 if (! TYPE_NAME (t))
7941 if (component_type == char_type_node)
7942 name = "complex char";
7943 else if (component_type == signed_char_type_node)
7944 name = "complex signed char";
7945 else if (component_type == unsigned_char_type_node)
7946 name = "complex unsigned char";
7947 else if (component_type == short_integer_type_node)
7948 name = "complex short int";
7949 else if (component_type == short_unsigned_type_node)
7950 name = "complex short unsigned int";
7951 else if (component_type == integer_type_node)
7952 name = "complex int";
7953 else if (component_type == unsigned_type_node)
7954 name = "complex unsigned int";
7955 else if (component_type == long_integer_type_node)
7956 name = "complex long int";
7957 else if (component_type == long_unsigned_type_node)
7958 name = "complex long unsigned int";
7959 else if (component_type == long_long_integer_type_node)
7960 name = "complex long long int";
7961 else if (component_type == long_long_unsigned_type_node)
7962 name = "complex long long unsigned int";
7967 TYPE_NAME (t) = build_decl (UNKNOWN_LOCATION, TYPE_DECL,
7968 get_identifier (name), t);
7971 return build_qualified_type (t, TYPE_QUALS (component_type));
7974 /* If TYPE is a real or complex floating-point type and the target
7975 does not directly support arithmetic on TYPE then return the wider
7976 type to be used for arithmetic on TYPE. Otherwise, return
7980 excess_precision_type (tree type)
7982 if (flag_excess_precision != EXCESS_PRECISION_FAST)
7984 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
7985 switch (TREE_CODE (type))
7988 switch (flt_eval_method)
7991 if (TYPE_MODE (type) == TYPE_MODE (float_type_node))
7992 return double_type_node;
7995 if (TYPE_MODE (type) == TYPE_MODE (float_type_node)
7996 || TYPE_MODE (type) == TYPE_MODE (double_type_node))
7997 return long_double_type_node;
8004 if (TREE_CODE (TREE_TYPE (type)) != REAL_TYPE)
8006 switch (flt_eval_method)
8009 if (TYPE_MODE (TREE_TYPE (type)) == TYPE_MODE (float_type_node))
8010 return complex_double_type_node;
8013 if (TYPE_MODE (TREE_TYPE (type)) == TYPE_MODE (float_type_node)
8014 || (TYPE_MODE (TREE_TYPE (type))
8015 == TYPE_MODE (double_type_node)))
8016 return complex_long_double_type_node;
8029 /* Return OP, stripped of any conversions to wider types as much as is safe.
8030 Converting the value back to OP's type makes a value equivalent to OP.
8032 If FOR_TYPE is nonzero, we return a value which, if converted to
8033 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
8035 OP must have integer, real or enumeral type. Pointers are not allowed!
8037 There are some cases where the obvious value we could return
8038 would regenerate to OP if converted to OP's type,
8039 but would not extend like OP to wider types.
8040 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
8041 For example, if OP is (unsigned short)(signed char)-1,
8042 we avoid returning (signed char)-1 if FOR_TYPE is int,
8043 even though extending that to an unsigned short would regenerate OP,
8044 since the result of extending (signed char)-1 to (int)
8045 is different from (int) OP. */
8048 get_unwidened (tree op, tree for_type)
8050 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
8051 tree type = TREE_TYPE (op);
8053 = TYPE_PRECISION (for_type != 0 ? for_type : type);
8055 = (for_type != 0 && for_type != type
8056 && final_prec > TYPE_PRECISION (type)
8057 && TYPE_UNSIGNED (type));
8060 while (CONVERT_EXPR_P (op))
8064 /* TYPE_PRECISION on vector types has different meaning
8065 (TYPE_VECTOR_SUBPARTS) and casts from vectors are view conversions,
8066 so avoid them here. */
8067 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (op, 0))) == VECTOR_TYPE)
8070 bitschange = TYPE_PRECISION (TREE_TYPE (op))
8071 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0)));
8073 /* Truncations are many-one so cannot be removed.
8074 Unless we are later going to truncate down even farther. */
8076 && final_prec > TYPE_PRECISION (TREE_TYPE (op)))
8079 /* See what's inside this conversion. If we decide to strip it,
8081 op = TREE_OPERAND (op, 0);
8083 /* If we have not stripped any zero-extensions (uns is 0),
8084 we can strip any kind of extension.
8085 If we have previously stripped a zero-extension,
8086 only zero-extensions can safely be stripped.
8087 Any extension can be stripped if the bits it would produce
8088 are all going to be discarded later by truncating to FOR_TYPE. */
8092 if (! uns || final_prec <= TYPE_PRECISION (TREE_TYPE (op)))
8094 /* TYPE_UNSIGNED says whether this is a zero-extension.
8095 Let's avoid computing it if it does not affect WIN
8096 and if UNS will not be needed again. */
8098 || CONVERT_EXPR_P (op))
8099 && TYPE_UNSIGNED (TREE_TYPE (op)))
8107 /* If we finally reach a constant see if it fits in for_type and
8108 in that case convert it. */
8110 && TREE_CODE (win) == INTEGER_CST
8111 && TREE_TYPE (win) != for_type
8112 && int_fits_type_p (win, for_type))
8113 win = fold_convert (for_type, win);
8118 /* Return OP or a simpler expression for a narrower value
8119 which can be sign-extended or zero-extended to give back OP.
8120 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
8121 or 0 if the value should be sign-extended. */
8124 get_narrower (tree op, int *unsignedp_ptr)
8129 bool integral_p = INTEGRAL_TYPE_P (TREE_TYPE (op));
8131 while (TREE_CODE (op) == NOP_EXPR)
8134 = (TYPE_PRECISION (TREE_TYPE (op))
8135 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0))));
8137 /* Truncations are many-one so cannot be removed. */
8141 /* See what's inside this conversion. If we decide to strip it,
8146 op = TREE_OPERAND (op, 0);
8147 /* An extension: the outermost one can be stripped,
8148 but remember whether it is zero or sign extension. */
8150 uns = TYPE_UNSIGNED (TREE_TYPE (op));
8151 /* Otherwise, if a sign extension has been stripped,
8152 only sign extensions can now be stripped;
8153 if a zero extension has been stripped, only zero-extensions. */
8154 else if (uns != TYPE_UNSIGNED (TREE_TYPE (op)))
8158 else /* bitschange == 0 */
8160 /* A change in nominal type can always be stripped, but we must
8161 preserve the unsignedness. */
8163 uns = TYPE_UNSIGNED (TREE_TYPE (op));
8165 op = TREE_OPERAND (op, 0);
8166 /* Keep trying to narrow, but don't assign op to win if it
8167 would turn an integral type into something else. */
8168 if (INTEGRAL_TYPE_P (TREE_TYPE (op)) != integral_p)
8175 if (TREE_CODE (op) == COMPONENT_REF
8176 /* Since type_for_size always gives an integer type. */
8177 && TREE_CODE (TREE_TYPE (op)) != REAL_TYPE
8178 && TREE_CODE (TREE_TYPE (op)) != FIXED_POINT_TYPE
8179 /* Ensure field is laid out already. */
8180 && DECL_SIZE (TREE_OPERAND (op, 1)) != 0
8181 && host_integerp (DECL_SIZE (TREE_OPERAND (op, 1)), 1))
8183 unsigned HOST_WIDE_INT innerprec
8184 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op, 1)), 1);
8185 int unsignedp = (DECL_UNSIGNED (TREE_OPERAND (op, 1))
8186 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op, 1))));
8187 tree type = lang_hooks.types.type_for_size (innerprec, unsignedp);
8189 /* We can get this structure field in a narrower type that fits it,
8190 but the resulting extension to its nominal type (a fullword type)
8191 must satisfy the same conditions as for other extensions.
8193 Do this only for fields that are aligned (not bit-fields),
8194 because when bit-field insns will be used there is no
8195 advantage in doing this. */
8197 if (innerprec < TYPE_PRECISION (TREE_TYPE (op))
8198 && ! DECL_BIT_FIELD (TREE_OPERAND (op, 1))
8199 && (first || uns == DECL_UNSIGNED (TREE_OPERAND (op, 1)))
8203 uns = DECL_UNSIGNED (TREE_OPERAND (op, 1));
8204 win = fold_convert (type, op);
8208 *unsignedp_ptr = uns;
8212 /* Returns true if integer constant C has a value that is permissible
8213 for type TYPE (an INTEGER_TYPE). */
8216 int_fits_type_p (const_tree c, const_tree type)
8218 tree type_low_bound, type_high_bound;
8219 bool ok_for_low_bound, ok_for_high_bound, unsc;
8222 dc = tree_to_double_int (c);
8223 unsc = TYPE_UNSIGNED (TREE_TYPE (c));
8225 if (TREE_CODE (TREE_TYPE (c)) == INTEGER_TYPE
8226 && TYPE_IS_SIZETYPE (TREE_TYPE (c))
8228 /* So c is an unsigned integer whose type is sizetype and type is not.
8229 sizetype'd integers are sign extended even though they are
8230 unsigned. If the integer value fits in the lower end word of c,
8231 and if the higher end word has all its bits set to 1, that
8232 means the higher end bits are set to 1 only for sign extension.
8233 So let's convert c into an equivalent zero extended unsigned
8235 dc = double_int_zext (dc, TYPE_PRECISION (TREE_TYPE (c)));
8238 type_low_bound = TYPE_MIN_VALUE (type);
8239 type_high_bound = TYPE_MAX_VALUE (type);
8241 /* If at least one bound of the type is a constant integer, we can check
8242 ourselves and maybe make a decision. If no such decision is possible, but
8243 this type is a subtype, try checking against that. Otherwise, use
8244 double_int_fits_to_tree_p, which checks against the precision.
8246 Compute the status for each possibly constant bound, and return if we see
8247 one does not match. Use ok_for_xxx_bound for this purpose, assigning -1
8248 for "unknown if constant fits", 0 for "constant known *not* to fit" and 1
8249 for "constant known to fit". */
8251 /* Check if c >= type_low_bound. */
8252 if (type_low_bound && TREE_CODE (type_low_bound) == INTEGER_CST)
8254 dd = tree_to_double_int (type_low_bound);
8255 if (TREE_CODE (type) == INTEGER_TYPE
8256 && TYPE_IS_SIZETYPE (type)
8257 && TYPE_UNSIGNED (type))
8258 dd = double_int_zext (dd, TYPE_PRECISION (type));
8259 if (unsc != TYPE_UNSIGNED (TREE_TYPE (type_low_bound)))
8261 int c_neg = (!unsc && double_int_negative_p (dc));
8262 int t_neg = (unsc && double_int_negative_p (dd));
8264 if (c_neg && !t_neg)
8266 if ((c_neg || !t_neg) && double_int_ucmp (dc, dd) < 0)
8269 else if (double_int_cmp (dc, dd, unsc) < 0)
8271 ok_for_low_bound = true;
8274 ok_for_low_bound = false;
8276 /* Check if c <= type_high_bound. */
8277 if (type_high_bound && TREE_CODE (type_high_bound) == INTEGER_CST)
8279 dd = tree_to_double_int (type_high_bound);
8280 if (TREE_CODE (type) == INTEGER_TYPE
8281 && TYPE_IS_SIZETYPE (type)
8282 && TYPE_UNSIGNED (type))
8283 dd = double_int_zext (dd, TYPE_PRECISION (type));
8284 if (unsc != TYPE_UNSIGNED (TREE_TYPE (type_high_bound)))
8286 int c_neg = (!unsc && double_int_negative_p (dc));
8287 int t_neg = (unsc && double_int_negative_p (dd));
8289 if (t_neg && !c_neg)
8291 if ((t_neg || !c_neg) && double_int_ucmp (dc, dd) > 0)
8294 else if (double_int_cmp (dc, dd, unsc) > 0)
8296 ok_for_high_bound = true;
8299 ok_for_high_bound = false;
8301 /* If the constant fits both bounds, the result is known. */
8302 if (ok_for_low_bound && ok_for_high_bound)
8305 /* Perform some generic filtering which may allow making a decision
8306 even if the bounds are not constant. First, negative integers
8307 never fit in unsigned types, */
8308 if (TYPE_UNSIGNED (type) && !unsc && double_int_negative_p (dc))
8311 /* Second, narrower types always fit in wider ones. */
8312 if (TYPE_PRECISION (type) > TYPE_PRECISION (TREE_TYPE (c)))
8315 /* Third, unsigned integers with top bit set never fit signed types. */
8316 if (! TYPE_UNSIGNED (type) && unsc)
8318 int prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (c))) - 1;
8319 if (prec < HOST_BITS_PER_WIDE_INT)
8321 if (((((unsigned HOST_WIDE_INT) 1) << prec) & dc.low) != 0)
8324 else if (((((unsigned HOST_WIDE_INT) 1)
8325 << (prec - HOST_BITS_PER_WIDE_INT)) & dc.high) != 0)
8329 /* If we haven't been able to decide at this point, there nothing more we
8330 can check ourselves here. Look at the base type if we have one and it
8331 has the same precision. */
8332 if (TREE_CODE (type) == INTEGER_TYPE
8333 && TREE_TYPE (type) != 0
8334 && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (type)))
8336 type = TREE_TYPE (type);
8340 /* Or to double_int_fits_to_tree_p, if nothing else. */
8341 return double_int_fits_to_tree_p (type, dc);
8344 /* Stores bounds of an integer TYPE in MIN and MAX. If TYPE has non-constant
8345 bounds or is a POINTER_TYPE, the maximum and/or minimum values that can be
8346 represented (assuming two's-complement arithmetic) within the bit
8347 precision of the type are returned instead. */
8350 get_type_static_bounds (const_tree type, mpz_t min, mpz_t max)
8352 if (!POINTER_TYPE_P (type) && TYPE_MIN_VALUE (type)
8353 && TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST)
8354 mpz_set_double_int (min, tree_to_double_int (TYPE_MIN_VALUE (type)),
8355 TYPE_UNSIGNED (type));
8358 if (TYPE_UNSIGNED (type))
8359 mpz_set_ui (min, 0);
8363 mn = double_int_mask (TYPE_PRECISION (type) - 1);
8364 mn = double_int_sext (double_int_add (mn, double_int_one),
8365 TYPE_PRECISION (type));
8366 mpz_set_double_int (min, mn, false);
8370 if (!POINTER_TYPE_P (type) && TYPE_MAX_VALUE (type)
8371 && TREE_CODE (TYPE_MAX_VALUE (type)) == INTEGER_CST)
8372 mpz_set_double_int (max, tree_to_double_int (TYPE_MAX_VALUE (type)),
8373 TYPE_UNSIGNED (type));
8376 if (TYPE_UNSIGNED (type))
8377 mpz_set_double_int (max, double_int_mask (TYPE_PRECISION (type)),
8380 mpz_set_double_int (max, double_int_mask (TYPE_PRECISION (type) - 1),
8385 /* Return true if VAR is an automatic variable defined in function FN. */
8388 auto_var_in_fn_p (const_tree var, const_tree fn)
8390 return (DECL_P (var) && DECL_CONTEXT (var) == fn
8391 && ((((TREE_CODE (var) == VAR_DECL && ! DECL_EXTERNAL (var))
8392 || TREE_CODE (var) == PARM_DECL)
8393 && ! TREE_STATIC (var))
8394 || TREE_CODE (var) == LABEL_DECL
8395 || TREE_CODE (var) == RESULT_DECL));
8398 /* Subprogram of following function. Called by walk_tree.
8400 Return *TP if it is an automatic variable or parameter of the
8401 function passed in as DATA. */
8404 find_var_from_fn (tree *tp, int *walk_subtrees, void *data)
8406 tree fn = (tree) data;
8411 else if (DECL_P (*tp)
8412 && auto_var_in_fn_p (*tp, fn))
8418 /* Returns true if T is, contains, or refers to a type with variable
8419 size. For METHOD_TYPEs and FUNCTION_TYPEs we exclude the
8420 arguments, but not the return type. If FN is nonzero, only return
8421 true if a modifier of the type or position of FN is a variable or
8422 parameter inside FN.
8424 This concept is more general than that of C99 'variably modified types':
8425 in C99, a struct type is never variably modified because a VLA may not
8426 appear as a structure member. However, in GNU C code like:
8428 struct S { int i[f()]; };
8430 is valid, and other languages may define similar constructs. */
8433 variably_modified_type_p (tree type, tree fn)
8437 /* Test if T is either variable (if FN is zero) or an expression containing
8438 a variable in FN. */
8439 #define RETURN_TRUE_IF_VAR(T) \
8440 do { tree _t = (T); \
8441 if (_t != NULL_TREE \
8442 && _t != error_mark_node \
8443 && TREE_CODE (_t) != INTEGER_CST \
8444 && TREE_CODE (_t) != PLACEHOLDER_EXPR \
8445 && (!fn || walk_tree (&_t, find_var_from_fn, fn, NULL))) \
8446 return true; } while (0)
8448 if (type == error_mark_node)
8451 /* If TYPE itself has variable size, it is variably modified. */
8452 RETURN_TRUE_IF_VAR (TYPE_SIZE (type));
8453 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT (type));
8455 switch (TREE_CODE (type))
8458 case REFERENCE_TYPE:
8460 if (variably_modified_type_p (TREE_TYPE (type), fn))
8466 /* If TYPE is a function type, it is variably modified if the
8467 return type is variably modified. */
8468 if (variably_modified_type_p (TREE_TYPE (type), fn))
8474 case FIXED_POINT_TYPE:
8477 /* Scalar types are variably modified if their end points
8479 RETURN_TRUE_IF_VAR (TYPE_MIN_VALUE (type));
8480 RETURN_TRUE_IF_VAR (TYPE_MAX_VALUE (type));
8485 case QUAL_UNION_TYPE:
8486 /* We can't see if any of the fields are variably-modified by the
8487 definition we normally use, since that would produce infinite
8488 recursion via pointers. */
8489 /* This is variably modified if some field's type is. */
8490 for (t = TYPE_FIELDS (type); t; t = DECL_CHAIN (t))
8491 if (TREE_CODE (t) == FIELD_DECL)
8493 RETURN_TRUE_IF_VAR (DECL_FIELD_OFFSET (t));
8494 RETURN_TRUE_IF_VAR (DECL_SIZE (t));
8495 RETURN_TRUE_IF_VAR (DECL_SIZE_UNIT (t));
8497 if (TREE_CODE (type) == QUAL_UNION_TYPE)
8498 RETURN_TRUE_IF_VAR (DECL_QUALIFIER (t));
8503 /* Do not call ourselves to avoid infinite recursion. This is
8504 variably modified if the element type is. */
8505 RETURN_TRUE_IF_VAR (TYPE_SIZE (TREE_TYPE (type)));
8506 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT (TREE_TYPE (type)));
8513 /* The current language may have other cases to check, but in general,
8514 all other types are not variably modified. */
8515 return lang_hooks.tree_inlining.var_mod_type_p (type, fn);
8517 #undef RETURN_TRUE_IF_VAR
8520 /* Given a DECL or TYPE, return the scope in which it was declared, or
8521 NULL_TREE if there is no containing scope. */
8524 get_containing_scope (const_tree t)
8526 return (TYPE_P (t) ? TYPE_CONTEXT (t) : DECL_CONTEXT (t));
8529 /* Return the innermost context enclosing DECL that is
8530 a FUNCTION_DECL, or zero if none. */
8533 decl_function_context (const_tree decl)
8537 if (TREE_CODE (decl) == ERROR_MARK)
8540 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
8541 where we look up the function at runtime. Such functions always take
8542 a first argument of type 'pointer to real context'.
8544 C++ should really be fixed to use DECL_CONTEXT for the real context,
8545 and use something else for the "virtual context". */
8546 else if (TREE_CODE (decl) == FUNCTION_DECL && DECL_VINDEX (decl))
8549 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)))));
8551 context = DECL_CONTEXT (decl);
8553 while (context && TREE_CODE (context) != FUNCTION_DECL)
8555 if (TREE_CODE (context) == BLOCK)
8556 context = BLOCK_SUPERCONTEXT (context);
8558 context = get_containing_scope (context);
8564 /* Return the innermost context enclosing DECL that is
8565 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
8566 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
8569 decl_type_context (const_tree decl)
8571 tree context = DECL_CONTEXT (decl);
8574 switch (TREE_CODE (context))
8576 case NAMESPACE_DECL:
8577 case TRANSLATION_UNIT_DECL:
8582 case QUAL_UNION_TYPE:
8587 context = DECL_CONTEXT (context);
8591 context = BLOCK_SUPERCONTEXT (context);
8601 /* CALL is a CALL_EXPR. Return the declaration for the function
8602 called, or NULL_TREE if the called function cannot be
8606 get_callee_fndecl (const_tree call)
8610 if (call == error_mark_node)
8611 return error_mark_node;
8613 /* It's invalid to call this function with anything but a
8615 gcc_assert (TREE_CODE (call) == CALL_EXPR);
8617 /* The first operand to the CALL is the address of the function
8619 addr = CALL_EXPR_FN (call);
8623 /* If this is a readonly function pointer, extract its initial value. */
8624 if (DECL_P (addr) && TREE_CODE (addr) != FUNCTION_DECL
8625 && TREE_READONLY (addr) && ! TREE_THIS_VOLATILE (addr)
8626 && DECL_INITIAL (addr))
8627 addr = DECL_INITIAL (addr);
8629 /* If the address is just `&f' for some function `f', then we know
8630 that `f' is being called. */
8631 if (TREE_CODE (addr) == ADDR_EXPR
8632 && TREE_CODE (TREE_OPERAND (addr, 0)) == FUNCTION_DECL)
8633 return TREE_OPERAND (addr, 0);
8635 /* We couldn't figure out what was being called. */
8639 /* Print debugging information about tree nodes generated during the compile,
8640 and any language-specific information. */
8643 dump_tree_statistics (void)
8645 #ifdef GATHER_STATISTICS
8647 int total_nodes, total_bytes;
8650 fprintf (stderr, "\n??? tree nodes created\n\n");
8651 #ifdef GATHER_STATISTICS
8652 fprintf (stderr, "Kind Nodes Bytes\n");
8653 fprintf (stderr, "---------------------------------------\n");
8654 total_nodes = total_bytes = 0;
8655 for (i = 0; i < (int) all_kinds; i++)
8657 fprintf (stderr, "%-20s %7d %10d\n", tree_node_kind_names[i],
8658 tree_node_counts[i], tree_node_sizes[i]);
8659 total_nodes += tree_node_counts[i];
8660 total_bytes += tree_node_sizes[i];
8662 fprintf (stderr, "---------------------------------------\n");
8663 fprintf (stderr, "%-20s %7d %10d\n", "Total", total_nodes, total_bytes);
8664 fprintf (stderr, "---------------------------------------\n");
8665 fprintf (stderr, "Code Nodes\n");
8666 fprintf (stderr, "----------------------------\n");
8667 for (i = 0; i < (int) MAX_TREE_CODES; i++)
8668 fprintf (stderr, "%-20s %7d\n", tree_code_name[i], tree_code_counts[i]);
8669 fprintf (stderr, "----------------------------\n");
8670 ssanames_print_statistics ();
8671 phinodes_print_statistics ();
8673 fprintf (stderr, "(No per-node statistics)\n");
8675 print_type_hash_statistics ();
8676 print_debug_expr_statistics ();
8677 print_value_expr_statistics ();
8678 lang_hooks.print_statistics ();
8681 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
8683 /* Generate a crc32 of a byte. */
8686 crc32_byte (unsigned chksum, char byte)
8688 unsigned value = (unsigned) byte << 24;
8691 for (ix = 8; ix--; value <<= 1)
8695 feedback = (value ^ chksum) & 0x80000000 ? 0x04c11db7 : 0;
8703 /* Generate a crc32 of a string. */
8706 crc32_string (unsigned chksum, const char *string)
8710 chksum = crc32_byte (chksum, *string);
8716 /* P is a string that will be used in a symbol. Mask out any characters
8717 that are not valid in that context. */
8720 clean_symbol_name (char *p)
8724 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
8727 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
8734 /* Generate a name for a special-purpose function.
8735 The generated name may need to be unique across the whole link.
8736 Changes to this function may also require corresponding changes to
8737 xstrdup_mask_random.
8738 TYPE is some string to identify the purpose of this function to the
8739 linker or collect2; it must start with an uppercase letter,
8741 I - for constructors
8743 N - for C++ anonymous namespaces
8744 F - for DWARF unwind frame information. */
8747 get_file_function_name (const char *type)
8753 /* If we already have a name we know to be unique, just use that. */
8754 if (first_global_object_name)
8755 p = q = ASTRDUP (first_global_object_name);
8756 /* If the target is handling the constructors/destructors, they
8757 will be local to this file and the name is only necessary for
8759 We also assign sub_I and sub_D sufixes to constructors called from
8760 the global static constructors. These are always local. */
8761 else if (((type[0] == 'I' || type[0] == 'D') && targetm.have_ctors_dtors)
8762 || (strncmp (type, "sub_", 4) == 0
8763 && (type[4] == 'I' || type[4] == 'D')))
8765 const char *file = main_input_filename;
8767 file = input_filename;
8768 /* Just use the file's basename, because the full pathname
8769 might be quite long. */
8770 p = q = ASTRDUP (lbasename (file));
8774 /* Otherwise, the name must be unique across the entire link.
8775 We don't have anything that we know to be unique to this translation
8776 unit, so use what we do have and throw in some randomness. */
8778 const char *name = weak_global_object_name;
8779 const char *file = main_input_filename;
8784 file = input_filename;
8786 len = strlen (file);
8787 q = (char *) alloca (9 + 17 + len + 1);
8788 memcpy (q, file, len + 1);
8790 snprintf (q + len, 9 + 17 + 1, "_%08X_" HOST_WIDE_INT_PRINT_HEX,
8791 crc32_string (0, name), get_random_seed (false));
8796 clean_symbol_name (q);
8797 buf = (char *) alloca (sizeof (FILE_FUNCTION_FORMAT) + strlen (p)
8800 /* Set up the name of the file-level functions we may need.
8801 Use a global object (which is already required to be unique over
8802 the program) rather than the file name (which imposes extra
8804 sprintf (buf, FILE_FUNCTION_FORMAT, type, p);
8806 return get_identifier (buf);
8809 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
8811 /* Complain that the tree code of NODE does not match the expected 0
8812 terminated list of trailing codes. The trailing code list can be
8813 empty, for a more vague error message. FILE, LINE, and FUNCTION
8814 are of the caller. */
8817 tree_check_failed (const_tree node, const char *file,
8818 int line, const char *function, ...)
8822 unsigned length = 0;
8825 va_start (args, function);
8826 while ((code = va_arg (args, int)))
8827 length += 4 + strlen (tree_code_name[code]);
8832 va_start (args, function);
8833 length += strlen ("expected ");
8834 buffer = tmp = (char *) alloca (length);
8836 while ((code = va_arg (args, int)))
8838 const char *prefix = length ? " or " : "expected ";
8840 strcpy (tmp + length, prefix);
8841 length += strlen (prefix);
8842 strcpy (tmp + length, tree_code_name[code]);
8843 length += strlen (tree_code_name[code]);
8848 buffer = "unexpected node";
8850 internal_error ("tree check: %s, have %s in %s, at %s:%d",
8851 buffer, tree_code_name[TREE_CODE (node)],
8852 function, trim_filename (file), line);
8855 /* Complain that the tree code of NODE does match the expected 0
8856 terminated list of trailing codes. FILE, LINE, and FUNCTION are of
8860 tree_not_check_failed (const_tree node, const char *file,
8861 int line, const char *function, ...)
8865 unsigned length = 0;
8868 va_start (args, function);
8869 while ((code = va_arg (args, int)))
8870 length += 4 + strlen (tree_code_name[code]);
8872 va_start (args, function);
8873 buffer = (char *) alloca (length);
8875 while ((code = va_arg (args, int)))
8879 strcpy (buffer + length, " or ");
8882 strcpy (buffer + length, tree_code_name[code]);
8883 length += strlen (tree_code_name[code]);
8887 internal_error ("tree check: expected none of %s, have %s in %s, at %s:%d",
8888 buffer, tree_code_name[TREE_CODE (node)],
8889 function, trim_filename (file), line);
8892 /* Similar to tree_check_failed, except that we check for a class of tree
8893 code, given in CL. */
8896 tree_class_check_failed (const_tree node, const enum tree_code_class cl,
8897 const char *file, int line, const char *function)
8900 ("tree check: expected class %qs, have %qs (%s) in %s, at %s:%d",
8901 TREE_CODE_CLASS_STRING (cl),
8902 TREE_CODE_CLASS_STRING (TREE_CODE_CLASS (TREE_CODE (node))),
8903 tree_code_name[TREE_CODE (node)], function, trim_filename (file), line);
8906 /* Similar to tree_check_failed, except that instead of specifying a
8907 dozen codes, use the knowledge that they're all sequential. */
8910 tree_range_check_failed (const_tree node, const char *file, int line,
8911 const char *function, enum tree_code c1,
8915 unsigned length = 0;
8918 for (c = c1; c <= c2; ++c)
8919 length += 4 + strlen (tree_code_name[c]);
8921 length += strlen ("expected ");
8922 buffer = (char *) alloca (length);
8925 for (c = c1; c <= c2; ++c)
8927 const char *prefix = length ? " or " : "expected ";
8929 strcpy (buffer + length, prefix);
8930 length += strlen (prefix);
8931 strcpy (buffer + length, tree_code_name[c]);
8932 length += strlen (tree_code_name[c]);
8935 internal_error ("tree check: %s, have %s in %s, at %s:%d",
8936 buffer, tree_code_name[TREE_CODE (node)],
8937 function, trim_filename (file), line);
8941 /* Similar to tree_check_failed, except that we check that a tree does
8942 not have the specified code, given in CL. */
8945 tree_not_class_check_failed (const_tree node, const enum tree_code_class cl,
8946 const char *file, int line, const char *function)
8949 ("tree check: did not expect class %qs, have %qs (%s) in %s, at %s:%d",
8950 TREE_CODE_CLASS_STRING (cl),
8951 TREE_CODE_CLASS_STRING (TREE_CODE_CLASS (TREE_CODE (node))),
8952 tree_code_name[TREE_CODE (node)], function, trim_filename (file), line);
8956 /* Similar to tree_check_failed but applied to OMP_CLAUSE codes. */
8959 omp_clause_check_failed (const_tree node, const char *file, int line,
8960 const char *function, enum omp_clause_code code)
8962 internal_error ("tree check: expected omp_clause %s, have %s in %s, at %s:%d",
8963 omp_clause_code_name[code], tree_code_name[TREE_CODE (node)],
8964 function, trim_filename (file), line);
8968 /* Similar to tree_range_check_failed but applied to OMP_CLAUSE codes. */
8971 omp_clause_range_check_failed (const_tree node, const char *file, int line,
8972 const char *function, enum omp_clause_code c1,
8973 enum omp_clause_code c2)
8976 unsigned length = 0;
8979 for (c = c1; c <= c2; ++c)
8980 length += 4 + strlen (omp_clause_code_name[c]);
8982 length += strlen ("expected ");
8983 buffer = (char *) alloca (length);
8986 for (c = c1; c <= c2; ++c)
8988 const char *prefix = length ? " or " : "expected ";
8990 strcpy (buffer + length, prefix);
8991 length += strlen (prefix);
8992 strcpy (buffer + length, omp_clause_code_name[c]);
8993 length += strlen (omp_clause_code_name[c]);
8996 internal_error ("tree check: %s, have %s in %s, at %s:%d",
8997 buffer, omp_clause_code_name[TREE_CODE (node)],
8998 function, trim_filename (file), line);
9002 #undef DEFTREESTRUCT
9003 #define DEFTREESTRUCT(VAL, NAME) NAME,
9005 static const char *ts_enum_names[] = {
9006 #include "treestruct.def"
9008 #undef DEFTREESTRUCT
9010 #define TS_ENUM_NAME(EN) (ts_enum_names[(EN)])
9012 /* Similar to tree_class_check_failed, except that we check for
9013 whether CODE contains the tree structure identified by EN. */
9016 tree_contains_struct_check_failed (const_tree node,
9017 const enum tree_node_structure_enum en,
9018 const char *file, int line,
9019 const char *function)
9022 ("tree check: expected tree that contains %qs structure, have %qs in %s, at %s:%d",
9024 tree_code_name[TREE_CODE (node)], function, trim_filename (file), line);
9028 /* Similar to above, except that the check is for the bounds of a TREE_VEC's
9029 (dynamically sized) vector. */
9032 tree_vec_elt_check_failed (int idx, int len, const char *file, int line,
9033 const char *function)
9036 ("tree check: accessed elt %d of tree_vec with %d elts in %s, at %s:%d",
9037 idx + 1, len, function, trim_filename (file), line);
9040 /* Similar to above, except that the check is for the bounds of the operand
9041 vector of an expression node EXP. */
9044 tree_operand_check_failed (int idx, const_tree exp, const char *file,
9045 int line, const char *function)
9047 int code = TREE_CODE (exp);
9049 ("tree check: accessed operand %d of %s with %d operands in %s, at %s:%d",
9050 idx + 1, tree_code_name[code], TREE_OPERAND_LENGTH (exp),
9051 function, trim_filename (file), line);
9054 /* Similar to above, except that the check is for the number of
9055 operands of an OMP_CLAUSE node. */
9058 omp_clause_operand_check_failed (int idx, const_tree t, const char *file,
9059 int line, const char *function)
9062 ("tree check: accessed operand %d of omp_clause %s with %d operands "
9063 "in %s, at %s:%d", idx + 1, omp_clause_code_name[OMP_CLAUSE_CODE (t)],
9064 omp_clause_num_ops [OMP_CLAUSE_CODE (t)], function,
9065 trim_filename (file), line);
9067 #endif /* ENABLE_TREE_CHECKING */
9069 /* Create a new vector type node holding SUBPARTS units of type INNERTYPE,
9070 and mapped to the machine mode MODE. Initialize its fields and build
9071 the information necessary for debugging output. */
9074 make_vector_type (tree innertype, int nunits, enum machine_mode mode)
9077 hashval_t hashcode = 0;
9079 t = make_node (VECTOR_TYPE);
9080 TREE_TYPE (t) = TYPE_MAIN_VARIANT (innertype);
9081 SET_TYPE_VECTOR_SUBPARTS (t, nunits);
9082 SET_TYPE_MODE (t, mode);
9084 if (TYPE_STRUCTURAL_EQUALITY_P (innertype))
9085 SET_TYPE_STRUCTURAL_EQUALITY (t);
9086 else if (TYPE_CANONICAL (innertype) != innertype
9087 || mode != VOIDmode)
9089 = make_vector_type (TYPE_CANONICAL (innertype), nunits, VOIDmode);
9093 hashcode = iterative_hash_host_wide_int (VECTOR_TYPE, hashcode);
9094 hashcode = iterative_hash_host_wide_int (nunits, hashcode);
9095 hashcode = iterative_hash_host_wide_int (mode, hashcode);
9096 hashcode = iterative_hash_object (TYPE_HASH (TREE_TYPE (t)), hashcode);
9097 t = type_hash_canon (hashcode, t);
9099 /* We have built a main variant, based on the main variant of the
9100 inner type. Use it to build the variant we return. */
9101 if ((TYPE_ATTRIBUTES (innertype) || TYPE_QUALS (innertype))
9102 && TREE_TYPE (t) != innertype)
9103 return build_type_attribute_qual_variant (t,
9104 TYPE_ATTRIBUTES (innertype),
9105 TYPE_QUALS (innertype));
9111 make_or_reuse_type (unsigned size, int unsignedp)
9113 if (size == INT_TYPE_SIZE)
9114 return unsignedp ? unsigned_type_node : integer_type_node;
9115 if (size == CHAR_TYPE_SIZE)
9116 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
9117 if (size == SHORT_TYPE_SIZE)
9118 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
9119 if (size == LONG_TYPE_SIZE)
9120 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
9121 if (size == LONG_LONG_TYPE_SIZE)
9122 return (unsignedp ? long_long_unsigned_type_node
9123 : long_long_integer_type_node);
9124 if (size == 128 && int128_integer_type_node)
9125 return (unsignedp ? int128_unsigned_type_node
9126 : int128_integer_type_node);
9129 return make_unsigned_type (size);
9131 return make_signed_type (size);
9134 /* Create or reuse a fract type by SIZE, UNSIGNEDP, and SATP. */
9137 make_or_reuse_fract_type (unsigned size, int unsignedp, int satp)
9141 if (size == SHORT_FRACT_TYPE_SIZE)
9142 return unsignedp ? sat_unsigned_short_fract_type_node
9143 : sat_short_fract_type_node;
9144 if (size == FRACT_TYPE_SIZE)
9145 return unsignedp ? sat_unsigned_fract_type_node : sat_fract_type_node;
9146 if (size == LONG_FRACT_TYPE_SIZE)
9147 return unsignedp ? sat_unsigned_long_fract_type_node
9148 : sat_long_fract_type_node;
9149 if (size == LONG_LONG_FRACT_TYPE_SIZE)
9150 return unsignedp ? sat_unsigned_long_long_fract_type_node
9151 : sat_long_long_fract_type_node;
9155 if (size == SHORT_FRACT_TYPE_SIZE)
9156 return unsignedp ? unsigned_short_fract_type_node
9157 : short_fract_type_node;
9158 if (size == FRACT_TYPE_SIZE)
9159 return unsignedp ? unsigned_fract_type_node : fract_type_node;
9160 if (size == LONG_FRACT_TYPE_SIZE)
9161 return unsignedp ? unsigned_long_fract_type_node
9162 : long_fract_type_node;
9163 if (size == LONG_LONG_FRACT_TYPE_SIZE)
9164 return unsignedp ? unsigned_long_long_fract_type_node
9165 : long_long_fract_type_node;
9168 return make_fract_type (size, unsignedp, satp);
9171 /* Create or reuse an accum type by SIZE, UNSIGNEDP, and SATP. */
9174 make_or_reuse_accum_type (unsigned size, int unsignedp, int satp)
9178 if (size == SHORT_ACCUM_TYPE_SIZE)
9179 return unsignedp ? sat_unsigned_short_accum_type_node
9180 : sat_short_accum_type_node;
9181 if (size == ACCUM_TYPE_SIZE)
9182 return unsignedp ? sat_unsigned_accum_type_node : sat_accum_type_node;
9183 if (size == LONG_ACCUM_TYPE_SIZE)
9184 return unsignedp ? sat_unsigned_long_accum_type_node
9185 : sat_long_accum_type_node;
9186 if (size == LONG_LONG_ACCUM_TYPE_SIZE)
9187 return unsignedp ? sat_unsigned_long_long_accum_type_node
9188 : sat_long_long_accum_type_node;
9192 if (size == SHORT_ACCUM_TYPE_SIZE)
9193 return unsignedp ? unsigned_short_accum_type_node
9194 : short_accum_type_node;
9195 if (size == ACCUM_TYPE_SIZE)
9196 return unsignedp ? unsigned_accum_type_node : accum_type_node;
9197 if (size == LONG_ACCUM_TYPE_SIZE)
9198 return unsignedp ? unsigned_long_accum_type_node
9199 : long_accum_type_node;
9200 if (size == LONG_LONG_ACCUM_TYPE_SIZE)
9201 return unsignedp ? unsigned_long_long_accum_type_node
9202 : long_long_accum_type_node;
9205 return make_accum_type (size, unsignedp, satp);
9208 /* Create nodes for all integer types (and error_mark_node) using the sizes
9209 of C datatypes. SIGNED_CHAR specifies whether char is signed,
9210 SHORT_DOUBLE specifies whether double should be of the same precision
9214 build_common_tree_nodes (bool signed_char, bool short_double)
9216 error_mark_node = make_node (ERROR_MARK);
9217 TREE_TYPE (error_mark_node) = error_mark_node;
9219 initialize_sizetypes ();
9221 /* Define both `signed char' and `unsigned char'. */
9222 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
9223 TYPE_STRING_FLAG (signed_char_type_node) = 1;
9224 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
9225 TYPE_STRING_FLAG (unsigned_char_type_node) = 1;
9227 /* Define `char', which is like either `signed char' or `unsigned char'
9228 but not the same as either. */
9231 ? make_signed_type (CHAR_TYPE_SIZE)
9232 : make_unsigned_type (CHAR_TYPE_SIZE));
9233 TYPE_STRING_FLAG (char_type_node) = 1;
9235 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
9236 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
9237 integer_type_node = make_signed_type (INT_TYPE_SIZE);
9238 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
9239 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
9240 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
9241 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
9242 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
9243 #if HOST_BITS_PER_WIDE_INT >= 64
9244 /* TODO: This isn't correct, but as logic depends at the moment on
9245 host's instead of target's wide-integer.
9246 If there is a target not supporting TImode, but has an 128-bit
9247 integer-scalar register, this target check needs to be adjusted. */
9248 if (targetm.scalar_mode_supported_p (TImode))
9250 int128_integer_type_node = make_signed_type (128);
9251 int128_unsigned_type_node = make_unsigned_type (128);
9255 /* Define a boolean type. This type only represents boolean values but
9256 may be larger than char depending on the value of BOOL_TYPE_SIZE.
9257 Front ends which want to override this size (i.e. Java) can redefine
9258 boolean_type_node before calling build_common_tree_nodes_2. */
9259 boolean_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
9260 TREE_SET_CODE (boolean_type_node, BOOLEAN_TYPE);
9261 TYPE_MAX_VALUE (boolean_type_node) = build_int_cst (boolean_type_node, 1);
9262 TYPE_PRECISION (boolean_type_node) = 1;
9264 /* Define what type to use for size_t. */
9265 if (strcmp (SIZE_TYPE, "unsigned int") == 0)
9266 size_type_node = unsigned_type_node;
9267 else if (strcmp (SIZE_TYPE, "long unsigned int") == 0)
9268 size_type_node = long_unsigned_type_node;
9269 else if (strcmp (SIZE_TYPE, "long long unsigned int") == 0)
9270 size_type_node = long_long_unsigned_type_node;
9271 else if (strcmp (SIZE_TYPE, "short unsigned int") == 0)
9272 size_type_node = short_unsigned_type_node;
9276 /* Fill in the rest of the sized types. Reuse existing type nodes
9278 intQI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (QImode), 0);
9279 intHI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (HImode), 0);
9280 intSI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (SImode), 0);
9281 intDI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (DImode), 0);
9282 intTI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (TImode), 0);
9284 unsigned_intQI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (QImode), 1);
9285 unsigned_intHI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (HImode), 1);
9286 unsigned_intSI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (SImode), 1);
9287 unsigned_intDI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (DImode), 1);
9288 unsigned_intTI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (TImode), 1);
9290 access_public_node = get_identifier ("public");
9291 access_protected_node = get_identifier ("protected");
9292 access_private_node = get_identifier ("private");
9294 /* Define these next since types below may used them. */
9295 integer_zero_node = build_int_cst (integer_type_node, 0);
9296 integer_one_node = build_int_cst (integer_type_node, 1);
9297 integer_three_node = build_int_cst (integer_type_node, 3);
9298 integer_minus_one_node = build_int_cst (integer_type_node, -1);
9300 size_zero_node = size_int (0);
9301 size_one_node = size_int (1);
9302 bitsize_zero_node = bitsize_int (0);
9303 bitsize_one_node = bitsize_int (1);
9304 bitsize_unit_node = bitsize_int (BITS_PER_UNIT);
9306 boolean_false_node = TYPE_MIN_VALUE (boolean_type_node);
9307 boolean_true_node = TYPE_MAX_VALUE (boolean_type_node);
9309 void_type_node = make_node (VOID_TYPE);
9310 layout_type (void_type_node);
9312 /* We are not going to have real types in C with less than byte alignment,
9313 so we might as well not have any types that claim to have it. */
9314 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
9315 TYPE_USER_ALIGN (void_type_node) = 0;
9317 null_pointer_node = build_int_cst (build_pointer_type (void_type_node), 0);
9318 layout_type (TREE_TYPE (null_pointer_node));
9320 ptr_type_node = build_pointer_type (void_type_node);
9322 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
9323 fileptr_type_node = ptr_type_node;
9325 float_type_node = make_node (REAL_TYPE);
9326 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
9327 layout_type (float_type_node);
9329 double_type_node = make_node (REAL_TYPE);
9331 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
9333 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
9334 layout_type (double_type_node);
9336 long_double_type_node = make_node (REAL_TYPE);
9337 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
9338 layout_type (long_double_type_node);
9340 float_ptr_type_node = build_pointer_type (float_type_node);
9341 double_ptr_type_node = build_pointer_type (double_type_node);
9342 long_double_ptr_type_node = build_pointer_type (long_double_type_node);
9343 integer_ptr_type_node = build_pointer_type (integer_type_node);
9345 /* Fixed size integer types. */
9346 uint32_type_node = build_nonstandard_integer_type (32, true);
9347 uint64_type_node = build_nonstandard_integer_type (64, true);
9349 /* Decimal float types. */
9350 dfloat32_type_node = make_node (REAL_TYPE);
9351 TYPE_PRECISION (dfloat32_type_node) = DECIMAL32_TYPE_SIZE;
9352 layout_type (dfloat32_type_node);
9353 SET_TYPE_MODE (dfloat32_type_node, SDmode);
9354 dfloat32_ptr_type_node = build_pointer_type (dfloat32_type_node);
9356 dfloat64_type_node = make_node (REAL_TYPE);
9357 TYPE_PRECISION (dfloat64_type_node) = DECIMAL64_TYPE_SIZE;
9358 layout_type (dfloat64_type_node);
9359 SET_TYPE_MODE (dfloat64_type_node, DDmode);
9360 dfloat64_ptr_type_node = build_pointer_type (dfloat64_type_node);
9362 dfloat128_type_node = make_node (REAL_TYPE);
9363 TYPE_PRECISION (dfloat128_type_node) = DECIMAL128_TYPE_SIZE;
9364 layout_type (dfloat128_type_node);
9365 SET_TYPE_MODE (dfloat128_type_node, TDmode);
9366 dfloat128_ptr_type_node = build_pointer_type (dfloat128_type_node);
9368 complex_integer_type_node = build_complex_type (integer_type_node);
9369 complex_float_type_node = build_complex_type (float_type_node);
9370 complex_double_type_node = build_complex_type (double_type_node);
9371 complex_long_double_type_node = build_complex_type (long_double_type_node);
9373 /* Make fixed-point nodes based on sat/non-sat and signed/unsigned. */
9374 #define MAKE_FIXED_TYPE_NODE(KIND,SIZE) \
9375 sat_ ## KIND ## _type_node = \
9376 make_sat_signed_ ## KIND ## _type (SIZE); \
9377 sat_unsigned_ ## KIND ## _type_node = \
9378 make_sat_unsigned_ ## KIND ## _type (SIZE); \
9379 KIND ## _type_node = make_signed_ ## KIND ## _type (SIZE); \
9380 unsigned_ ## KIND ## _type_node = \
9381 make_unsigned_ ## KIND ## _type (SIZE);
9383 #define MAKE_FIXED_TYPE_NODE_WIDTH(KIND,WIDTH,SIZE) \
9384 sat_ ## WIDTH ## KIND ## _type_node = \
9385 make_sat_signed_ ## KIND ## _type (SIZE); \
9386 sat_unsigned_ ## WIDTH ## KIND ## _type_node = \
9387 make_sat_unsigned_ ## KIND ## _type (SIZE); \
9388 WIDTH ## KIND ## _type_node = make_signed_ ## KIND ## _type (SIZE); \
9389 unsigned_ ## WIDTH ## KIND ## _type_node = \
9390 make_unsigned_ ## KIND ## _type (SIZE);
9392 /* Make fixed-point type nodes based on four different widths. */
9393 #define MAKE_FIXED_TYPE_NODE_FAMILY(N1,N2) \
9394 MAKE_FIXED_TYPE_NODE_WIDTH (N1, short_, SHORT_ ## N2 ## _TYPE_SIZE) \
9395 MAKE_FIXED_TYPE_NODE (N1, N2 ## _TYPE_SIZE) \
9396 MAKE_FIXED_TYPE_NODE_WIDTH (N1, long_, LONG_ ## N2 ## _TYPE_SIZE) \
9397 MAKE_FIXED_TYPE_NODE_WIDTH (N1, long_long_, LONG_LONG_ ## N2 ## _TYPE_SIZE)
9399 /* Make fixed-point mode nodes based on sat/non-sat and signed/unsigned. */
9400 #define MAKE_FIXED_MODE_NODE(KIND,NAME,MODE) \
9401 NAME ## _type_node = \
9402 make_or_reuse_signed_ ## KIND ## _type (GET_MODE_BITSIZE (MODE ## mode)); \
9403 u ## NAME ## _type_node = \
9404 make_or_reuse_unsigned_ ## KIND ## _type \
9405 (GET_MODE_BITSIZE (U ## MODE ## mode)); \
9406 sat_ ## NAME ## _type_node = \
9407 make_or_reuse_sat_signed_ ## KIND ## _type \
9408 (GET_MODE_BITSIZE (MODE ## mode)); \
9409 sat_u ## NAME ## _type_node = \
9410 make_or_reuse_sat_unsigned_ ## KIND ## _type \
9411 (GET_MODE_BITSIZE (U ## MODE ## mode));
9413 /* Fixed-point type and mode nodes. */
9414 MAKE_FIXED_TYPE_NODE_FAMILY (fract, FRACT)
9415 MAKE_FIXED_TYPE_NODE_FAMILY (accum, ACCUM)
9416 MAKE_FIXED_MODE_NODE (fract, qq, QQ)
9417 MAKE_FIXED_MODE_NODE (fract, hq, HQ)
9418 MAKE_FIXED_MODE_NODE (fract, sq, SQ)
9419 MAKE_FIXED_MODE_NODE (fract, dq, DQ)
9420 MAKE_FIXED_MODE_NODE (fract, tq, TQ)
9421 MAKE_FIXED_MODE_NODE (accum, ha, HA)
9422 MAKE_FIXED_MODE_NODE (accum, sa, SA)
9423 MAKE_FIXED_MODE_NODE (accum, da, DA)
9424 MAKE_FIXED_MODE_NODE (accum, ta, TA)
9427 tree t = targetm.build_builtin_va_list ();
9429 /* Many back-ends define record types without setting TYPE_NAME.
9430 If we copied the record type here, we'd keep the original
9431 record type without a name. This breaks name mangling. So,
9432 don't copy record types and let c_common_nodes_and_builtins()
9433 declare the type to be __builtin_va_list. */
9434 if (TREE_CODE (t) != RECORD_TYPE)
9435 t = build_variant_type_copy (t);
9437 va_list_type_node = t;
9441 /* A subroutine of build_common_builtin_nodes. Define a builtin function. */
9444 local_define_builtin (const char *name, tree type, enum built_in_function code,
9445 const char *library_name, int ecf_flags)
9449 decl = add_builtin_function (name, type, code, BUILT_IN_NORMAL,
9450 library_name, NULL_TREE);
9451 if (ecf_flags & ECF_CONST)
9452 TREE_READONLY (decl) = 1;
9453 if (ecf_flags & ECF_PURE)
9454 DECL_PURE_P (decl) = 1;
9455 if (ecf_flags & ECF_LOOPING_CONST_OR_PURE)
9456 DECL_LOOPING_CONST_OR_PURE_P (decl) = 1;
9457 if (ecf_flags & ECF_NORETURN)
9458 TREE_THIS_VOLATILE (decl) = 1;
9459 if (ecf_flags & ECF_NOTHROW)
9460 TREE_NOTHROW (decl) = 1;
9461 if (ecf_flags & ECF_MALLOC)
9462 DECL_IS_MALLOC (decl) = 1;
9463 if (ecf_flags & ECF_LEAF)
9464 DECL_ATTRIBUTES (decl) = tree_cons (get_identifier ("leaf"),
9465 NULL, DECL_ATTRIBUTES (decl));
9466 if ((ecf_flags & ECF_TM_PURE) && flag_tm)
9467 apply_tm_attr (decl, get_identifier ("transaction_pure"));
9469 set_builtin_decl (code, decl, true);
9472 /* Call this function after instantiating all builtins that the language
9473 front end cares about. This will build the rest of the builtins that
9474 are relied upon by the tree optimizers and the middle-end. */
9477 build_common_builtin_nodes (void)
9482 if (!builtin_decl_explicit_p (BUILT_IN_MEMCPY)
9483 || !builtin_decl_explicit_p (BUILT_IN_MEMMOVE))
9485 ftype = build_function_type_list (ptr_type_node,
9486 ptr_type_node, const_ptr_type_node,
9487 size_type_node, NULL_TREE);
9489 if (!builtin_decl_explicit_p (BUILT_IN_MEMCPY))
9490 local_define_builtin ("__builtin_memcpy", ftype, BUILT_IN_MEMCPY,
9491 "memcpy", ECF_NOTHROW | ECF_LEAF);
9492 if (!builtin_decl_explicit_p (BUILT_IN_MEMMOVE))
9493 local_define_builtin ("__builtin_memmove", ftype, BUILT_IN_MEMMOVE,
9494 "memmove", ECF_NOTHROW | ECF_LEAF);
9497 if (!builtin_decl_explicit_p (BUILT_IN_MEMCMP))
9499 ftype = build_function_type_list (integer_type_node, const_ptr_type_node,
9500 const_ptr_type_node, size_type_node,
9502 local_define_builtin ("__builtin_memcmp", ftype, BUILT_IN_MEMCMP,
9503 "memcmp", ECF_PURE | ECF_NOTHROW | ECF_LEAF);
9506 if (!builtin_decl_explicit_p (BUILT_IN_MEMSET))
9508 ftype = build_function_type_list (ptr_type_node,
9509 ptr_type_node, integer_type_node,
9510 size_type_node, NULL_TREE);
9511 local_define_builtin ("__builtin_memset", ftype, BUILT_IN_MEMSET,
9512 "memset", ECF_NOTHROW | ECF_LEAF);
9515 if (!builtin_decl_explicit_p (BUILT_IN_ALLOCA))
9517 ftype = build_function_type_list (ptr_type_node,
9518 size_type_node, NULL_TREE);
9519 local_define_builtin ("__builtin_alloca", ftype, BUILT_IN_ALLOCA,
9520 "alloca", ECF_MALLOC | ECF_NOTHROW | ECF_LEAF);
9523 ftype = build_function_type_list (ptr_type_node, size_type_node,
9524 size_type_node, NULL_TREE);
9525 local_define_builtin ("__builtin_alloca_with_align", ftype,
9526 BUILT_IN_ALLOCA_WITH_ALIGN, "alloca",
9527 ECF_MALLOC | ECF_NOTHROW | ECF_LEAF);
9529 /* If we're checking the stack, `alloca' can throw. */
9530 if (flag_stack_check)
9532 TREE_NOTHROW (builtin_decl_explicit (BUILT_IN_ALLOCA)) = 0;
9533 TREE_NOTHROW (builtin_decl_explicit (BUILT_IN_ALLOCA_WITH_ALIGN)) = 0;
9536 ftype = build_function_type_list (void_type_node,
9537 ptr_type_node, ptr_type_node,
9538 ptr_type_node, NULL_TREE);
9539 local_define_builtin ("__builtin_init_trampoline", ftype,
9540 BUILT_IN_INIT_TRAMPOLINE,
9541 "__builtin_init_trampoline", ECF_NOTHROW | ECF_LEAF);
9542 local_define_builtin ("__builtin_init_heap_trampoline", ftype,
9543 BUILT_IN_INIT_HEAP_TRAMPOLINE,
9544 "__builtin_init_heap_trampoline",
9545 ECF_NOTHROW | ECF_LEAF);
9547 ftype = build_function_type_list (ptr_type_node, ptr_type_node, NULL_TREE);
9548 local_define_builtin ("__builtin_adjust_trampoline", ftype,
9549 BUILT_IN_ADJUST_TRAMPOLINE,
9550 "__builtin_adjust_trampoline",
9551 ECF_CONST | ECF_NOTHROW);
9553 ftype = build_function_type_list (void_type_node,
9554 ptr_type_node, ptr_type_node, NULL_TREE);
9555 local_define_builtin ("__builtin_nonlocal_goto", ftype,
9556 BUILT_IN_NONLOCAL_GOTO,
9557 "__builtin_nonlocal_goto",
9558 ECF_NORETURN | ECF_NOTHROW);
9560 ftype = build_function_type_list (void_type_node,
9561 ptr_type_node, ptr_type_node, NULL_TREE);
9562 local_define_builtin ("__builtin_setjmp_setup", ftype,
9563 BUILT_IN_SETJMP_SETUP,
9564 "__builtin_setjmp_setup", ECF_NOTHROW);
9566 ftype = build_function_type_list (ptr_type_node, ptr_type_node, NULL_TREE);
9567 local_define_builtin ("__builtin_setjmp_dispatcher", ftype,
9568 BUILT_IN_SETJMP_DISPATCHER,
9569 "__builtin_setjmp_dispatcher",
9570 ECF_PURE | ECF_NOTHROW);
9572 ftype = build_function_type_list (void_type_node, ptr_type_node, NULL_TREE);
9573 local_define_builtin ("__builtin_setjmp_receiver", ftype,
9574 BUILT_IN_SETJMP_RECEIVER,
9575 "__builtin_setjmp_receiver", ECF_NOTHROW);
9577 ftype = build_function_type_list (ptr_type_node, NULL_TREE);
9578 local_define_builtin ("__builtin_stack_save", ftype, BUILT_IN_STACK_SAVE,
9579 "__builtin_stack_save", ECF_NOTHROW | ECF_LEAF);
9581 ftype = build_function_type_list (void_type_node, ptr_type_node, NULL_TREE);
9582 local_define_builtin ("__builtin_stack_restore", ftype,
9583 BUILT_IN_STACK_RESTORE,
9584 "__builtin_stack_restore", ECF_NOTHROW | ECF_LEAF);
9586 /* If there's a possibility that we might use the ARM EABI, build the
9587 alternate __cxa_end_cleanup node used to resume from C++ and Java. */
9588 if (targetm.arm_eabi_unwinder)
9590 ftype = build_function_type_list (void_type_node, NULL_TREE);
9591 local_define_builtin ("__builtin_cxa_end_cleanup", ftype,
9592 BUILT_IN_CXA_END_CLEANUP,
9593 "__cxa_end_cleanup", ECF_NORETURN | ECF_LEAF);
9596 ftype = build_function_type_list (void_type_node, ptr_type_node, NULL_TREE);
9597 local_define_builtin ("__builtin_unwind_resume", ftype,
9598 BUILT_IN_UNWIND_RESUME,
9599 ((targetm_common.except_unwind_info (&global_options)
9601 ? "_Unwind_SjLj_Resume" : "_Unwind_Resume"),
9604 if (builtin_decl_explicit (BUILT_IN_RETURN_ADDRESS) == NULL_TREE)
9606 ftype = build_function_type_list (ptr_type_node, integer_type_node,
9608 local_define_builtin ("__builtin_return_address", ftype,
9609 BUILT_IN_RETURN_ADDRESS,
9610 "__builtin_return_address",
9614 if (!builtin_decl_explicit_p (BUILT_IN_PROFILE_FUNC_ENTER)
9615 || !builtin_decl_explicit_p (BUILT_IN_PROFILE_FUNC_EXIT))
9617 ftype = build_function_type_list (void_type_node, ptr_type_node,
9618 ptr_type_node, NULL_TREE);
9619 if (!builtin_decl_explicit_p (BUILT_IN_PROFILE_FUNC_ENTER))
9620 local_define_builtin ("__cyg_profile_func_enter", ftype,
9621 BUILT_IN_PROFILE_FUNC_ENTER,
9622 "__cyg_profile_func_enter", 0);
9623 if (!builtin_decl_explicit_p (BUILT_IN_PROFILE_FUNC_EXIT))
9624 local_define_builtin ("__cyg_profile_func_exit", ftype,
9625 BUILT_IN_PROFILE_FUNC_EXIT,
9626 "__cyg_profile_func_exit", 0);
9629 /* The exception object and filter values from the runtime. The argument
9630 must be zero before exception lowering, i.e. from the front end. After
9631 exception lowering, it will be the region number for the exception
9632 landing pad. These functions are PURE instead of CONST to prevent
9633 them from being hoisted past the exception edge that will initialize
9634 its value in the landing pad. */
9635 ftype = build_function_type_list (ptr_type_node,
9636 integer_type_node, NULL_TREE);
9637 ecf_flags = ECF_PURE | ECF_NOTHROW | ECF_LEAF;
9638 /* Only use TM_PURE if we we have TM language support. */
9639 if (builtin_decl_explicit_p (BUILT_IN_TM_LOAD_1))
9640 ecf_flags |= ECF_TM_PURE;
9641 local_define_builtin ("__builtin_eh_pointer", ftype, BUILT_IN_EH_POINTER,
9642 "__builtin_eh_pointer", ecf_flags);
9644 tmp = lang_hooks.types.type_for_mode (targetm.eh_return_filter_mode (), 0);
9645 ftype = build_function_type_list (tmp, integer_type_node, NULL_TREE);
9646 local_define_builtin ("__builtin_eh_filter", ftype, BUILT_IN_EH_FILTER,
9647 "__builtin_eh_filter", ECF_PURE | ECF_NOTHROW | ECF_LEAF);
9649 ftype = build_function_type_list (void_type_node,
9650 integer_type_node, integer_type_node,
9652 local_define_builtin ("__builtin_eh_copy_values", ftype,
9653 BUILT_IN_EH_COPY_VALUES,
9654 "__builtin_eh_copy_values", ECF_NOTHROW);
9656 /* Complex multiplication and division. These are handled as builtins
9657 rather than optabs because emit_library_call_value doesn't support
9658 complex. Further, we can do slightly better with folding these
9659 beasties if the real and complex parts of the arguments are separate. */
9663 for (mode = MIN_MODE_COMPLEX_FLOAT; mode <= MAX_MODE_COMPLEX_FLOAT; ++mode)
9665 char mode_name_buf[4], *q;
9667 enum built_in_function mcode, dcode;
9668 tree type, inner_type;
9669 const char *prefix = "__";
9671 if (targetm.libfunc_gnu_prefix)
9674 type = lang_hooks.types.type_for_mode ((enum machine_mode) mode, 0);
9677 inner_type = TREE_TYPE (type);
9679 ftype = build_function_type_list (type, inner_type, inner_type,
9680 inner_type, inner_type, NULL_TREE);
9682 mcode = ((enum built_in_function)
9683 (BUILT_IN_COMPLEX_MUL_MIN + mode - MIN_MODE_COMPLEX_FLOAT));
9684 dcode = ((enum built_in_function)
9685 (BUILT_IN_COMPLEX_DIV_MIN + mode - MIN_MODE_COMPLEX_FLOAT));
9687 for (p = GET_MODE_NAME (mode), q = mode_name_buf; *p; p++, q++)
9691 built_in_names[mcode] = concat (prefix, "mul", mode_name_buf, "3",
9693 local_define_builtin (built_in_names[mcode], ftype, mcode,
9694 built_in_names[mcode],
9695 ECF_CONST | ECF_NOTHROW | ECF_LEAF);
9697 built_in_names[dcode] = concat (prefix, "div", mode_name_buf, "3",
9699 local_define_builtin (built_in_names[dcode], ftype, dcode,
9700 built_in_names[dcode],
9701 ECF_CONST | ECF_NOTHROW | ECF_LEAF);
9706 /* HACK. GROSS. This is absolutely disgusting. I wish there was a
9709 If we requested a pointer to a vector, build up the pointers that
9710 we stripped off while looking for the inner type. Similarly for
9711 return values from functions.
9713 The argument TYPE is the top of the chain, and BOTTOM is the
9714 new type which we will point to. */
9717 reconstruct_complex_type (tree type, tree bottom)
9721 if (TREE_CODE (type) == POINTER_TYPE)
9723 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
9724 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
9725 TYPE_REF_CAN_ALIAS_ALL (type));
9727 else if (TREE_CODE (type) == REFERENCE_TYPE)
9729 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
9730 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
9731 TYPE_REF_CAN_ALIAS_ALL (type));
9733 else if (TREE_CODE (type) == ARRAY_TYPE)
9735 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
9736 outer = build_array_type (inner, TYPE_DOMAIN (type));
9738 else if (TREE_CODE (type) == FUNCTION_TYPE)
9740 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
9741 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
9743 else if (TREE_CODE (type) == METHOD_TYPE)
9745 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
9746 /* The build_method_type_directly() routine prepends 'this' to argument list,
9747 so we must compensate by getting rid of it. */
9749 = build_method_type_directly
9750 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
9752 TREE_CHAIN (TYPE_ARG_TYPES (type)));
9754 else if (TREE_CODE (type) == OFFSET_TYPE)
9756 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
9757 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
9762 return build_type_attribute_qual_variant (outer, TYPE_ATTRIBUTES (type),
9766 /* Returns a vector tree node given a mode (integer, vector, or BLKmode) and
9769 build_vector_type_for_mode (tree innertype, enum machine_mode mode)
9773 switch (GET_MODE_CLASS (mode))
9775 case MODE_VECTOR_INT:
9776 case MODE_VECTOR_FLOAT:
9777 case MODE_VECTOR_FRACT:
9778 case MODE_VECTOR_UFRACT:
9779 case MODE_VECTOR_ACCUM:
9780 case MODE_VECTOR_UACCUM:
9781 nunits = GET_MODE_NUNITS (mode);
9785 /* Check that there are no leftover bits. */
9786 gcc_assert (GET_MODE_BITSIZE (mode)
9787 % TREE_INT_CST_LOW (TYPE_SIZE (innertype)) == 0);
9789 nunits = GET_MODE_BITSIZE (mode)
9790 / TREE_INT_CST_LOW (TYPE_SIZE (innertype));
9797 return make_vector_type (innertype, nunits, mode);
9800 /* Similarly, but takes the inner type and number of units, which must be
9804 build_vector_type (tree innertype, int nunits)
9806 return make_vector_type (innertype, nunits, VOIDmode);
9809 /* Similarly, but builds a variant type with TYPE_VECTOR_OPAQUE set. */
9812 build_opaque_vector_type (tree innertype, int nunits)
9814 tree t = make_vector_type (innertype, nunits, VOIDmode);
9816 /* We always build the non-opaque variant before the opaque one,
9817 so if it already exists, it is TYPE_NEXT_VARIANT of this one. */
9818 cand = TYPE_NEXT_VARIANT (t);
9820 && TYPE_VECTOR_OPAQUE (cand)
9821 && check_qualified_type (cand, t, TYPE_QUALS (t)))
9823 /* Othewise build a variant type and make sure to queue it after
9824 the non-opaque type. */
9825 cand = build_distinct_type_copy (t);
9826 TYPE_VECTOR_OPAQUE (cand) = true;
9827 TYPE_CANONICAL (cand) = TYPE_CANONICAL (t);
9828 TYPE_NEXT_VARIANT (cand) = TYPE_NEXT_VARIANT (t);
9829 TYPE_NEXT_VARIANT (t) = cand;
9830 TYPE_MAIN_VARIANT (cand) = TYPE_MAIN_VARIANT (t);
9835 /* Given an initializer INIT, return TRUE if INIT is zero or some
9836 aggregate of zeros. Otherwise return FALSE. */
9838 initializer_zerop (const_tree init)
9844 switch (TREE_CODE (init))
9847 return integer_zerop (init);
9850 /* ??? Note that this is not correct for C4X float formats. There,
9851 a bit pattern of all zeros is 1.0; 0.0 is encoded with the most
9852 negative exponent. */
9853 return real_zerop (init)
9854 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (init));
9857 return fixed_zerop (init);
9860 return integer_zerop (init)
9861 || (real_zerop (init)
9862 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_REALPART (init)))
9863 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_IMAGPART (init))));
9866 for (elt = TREE_VECTOR_CST_ELTS (init); elt; elt = TREE_CHAIN (elt))
9867 if (!initializer_zerop (TREE_VALUE (elt)))
9873 unsigned HOST_WIDE_INT idx;
9875 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (init), idx, elt)
9876 if (!initializer_zerop (elt))
9885 /* We need to loop through all elements to handle cases like
9886 "\0" and "\0foobar". */
9887 for (i = 0; i < TREE_STRING_LENGTH (init); ++i)
9888 if (TREE_STRING_POINTER (init)[i] != '\0')
9899 /* Build an empty statement at location LOC. */
9902 build_empty_stmt (location_t loc)
9904 tree t = build1 (NOP_EXPR, void_type_node, size_zero_node);
9905 SET_EXPR_LOCATION (t, loc);
9910 /* Build an OpenMP clause with code CODE. LOC is the location of the
9914 build_omp_clause (location_t loc, enum omp_clause_code code)
9919 length = omp_clause_num_ops[code];
9920 size = (sizeof (struct tree_omp_clause) + (length - 1) * sizeof (tree));
9922 record_node_allocation_statistics (OMP_CLAUSE, size);
9924 t = ggc_alloc_tree_node (size);
9925 memset (t, 0, size);
9926 TREE_SET_CODE (t, OMP_CLAUSE);
9927 OMP_CLAUSE_SET_CODE (t, code);
9928 OMP_CLAUSE_LOCATION (t) = loc;
9933 /* Build a tcc_vl_exp object with code CODE and room for LEN operands. LEN
9934 includes the implicit operand count in TREE_OPERAND 0, and so must be >= 1.
9935 Except for the CODE and operand count field, other storage for the
9936 object is initialized to zeros. */
9939 build_vl_exp_stat (enum tree_code code, int len MEM_STAT_DECL)
9942 int length = (len - 1) * sizeof (tree) + sizeof (struct tree_exp);
9944 gcc_assert (TREE_CODE_CLASS (code) == tcc_vl_exp);
9945 gcc_assert (len >= 1);
9947 record_node_allocation_statistics (code, length);
9949 t = ggc_alloc_zone_cleared_tree_node_stat (&tree_zone, length PASS_MEM_STAT);
9951 TREE_SET_CODE (t, code);
9953 /* Can't use TREE_OPERAND to store the length because if checking is
9954 enabled, it will try to check the length before we store it. :-P */
9955 t->exp.operands[0] = build_int_cst (sizetype, len);
9960 /* Helper function for build_call_* functions; build a CALL_EXPR with
9961 indicated RETURN_TYPE, FN, and NARGS, but do not initialize any of
9962 the argument slots. */
9965 build_call_1 (tree return_type, tree fn, int nargs)
9969 t = build_vl_exp (CALL_EXPR, nargs + 3);
9970 TREE_TYPE (t) = return_type;
9971 CALL_EXPR_FN (t) = fn;
9972 CALL_EXPR_STATIC_CHAIN (t) = NULL;
9977 /* Build a CALL_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE and
9978 FN and a null static chain slot. NARGS is the number of call arguments
9979 which are specified as "..." arguments. */
9982 build_call_nary (tree return_type, tree fn, int nargs, ...)
9986 va_start (args, nargs);
9987 ret = build_call_valist (return_type, fn, nargs, args);
9992 /* Build a CALL_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE and
9993 FN and a null static chain slot. NARGS is the number of call arguments
9994 which are specified as a va_list ARGS. */
9997 build_call_valist (tree return_type, tree fn, int nargs, va_list args)
10002 t = build_call_1 (return_type, fn, nargs);
10003 for (i = 0; i < nargs; i++)
10004 CALL_EXPR_ARG (t, i) = va_arg (args, tree);
10005 process_call_operands (t);
10009 /* Build a CALL_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE and
10010 FN and a null static chain slot. NARGS is the number of call arguments
10011 which are specified as a tree array ARGS. */
10014 build_call_array_loc (location_t loc, tree return_type, tree fn,
10015 int nargs, const tree *args)
10020 t = build_call_1 (return_type, fn, nargs);
10021 for (i = 0; i < nargs; i++)
10022 CALL_EXPR_ARG (t, i) = args[i];
10023 process_call_operands (t);
10024 SET_EXPR_LOCATION (t, loc);
10028 /* Like build_call_array, but takes a VEC. */
10031 build_call_vec (tree return_type, tree fn, VEC(tree,gc) *args)
10036 ret = build_call_1 (return_type, fn, VEC_length (tree, args));
10037 FOR_EACH_VEC_ELT (tree, args, ix, t)
10038 CALL_EXPR_ARG (ret, ix) = t;
10039 process_call_operands (ret);
10044 /* Returns true if it is possible to prove that the index of
10045 an array access REF (an ARRAY_REF expression) falls into the
10049 in_array_bounds_p (tree ref)
10051 tree idx = TREE_OPERAND (ref, 1);
10054 if (TREE_CODE (idx) != INTEGER_CST)
10057 min = array_ref_low_bound (ref);
10058 max = array_ref_up_bound (ref);
10061 || TREE_CODE (min) != INTEGER_CST
10062 || TREE_CODE (max) != INTEGER_CST)
10065 if (tree_int_cst_lt (idx, min)
10066 || tree_int_cst_lt (max, idx))
10072 /* Returns true if it is possible to prove that the range of
10073 an array access REF (an ARRAY_RANGE_REF expression) falls
10074 into the array bounds. */
10077 range_in_array_bounds_p (tree ref)
10079 tree domain_type = TYPE_DOMAIN (TREE_TYPE (ref));
10080 tree range_min, range_max, min, max;
10082 range_min = TYPE_MIN_VALUE (domain_type);
10083 range_max = TYPE_MAX_VALUE (domain_type);
10086 || TREE_CODE (range_min) != INTEGER_CST
10087 || TREE_CODE (range_max) != INTEGER_CST)
10090 min = array_ref_low_bound (ref);
10091 max = array_ref_up_bound (ref);
10094 || TREE_CODE (min) != INTEGER_CST
10095 || TREE_CODE (max) != INTEGER_CST)
10098 if (tree_int_cst_lt (range_min, min)
10099 || tree_int_cst_lt (max, range_max))
10105 /* Return true if T (assumed to be a DECL) must be assigned a memory
10109 needs_to_live_in_memory (const_tree t)
10111 if (TREE_CODE (t) == SSA_NAME)
10112 t = SSA_NAME_VAR (t);
10114 return (TREE_ADDRESSABLE (t)
10115 || is_global_var (t)
10116 || (TREE_CODE (t) == RESULT_DECL
10117 && !DECL_BY_REFERENCE (t)
10118 && aggregate_value_p (t, current_function_decl)));
10121 /* Return value of a constant X and sign-extend it. */
10124 int_cst_value (const_tree x)
10126 unsigned bits = TYPE_PRECISION (TREE_TYPE (x));
10127 unsigned HOST_WIDE_INT val = TREE_INT_CST_LOW (x);
10129 /* Make sure the sign-extended value will fit in a HOST_WIDE_INT. */
10130 gcc_assert (TREE_INT_CST_HIGH (x) == 0
10131 || TREE_INT_CST_HIGH (x) == -1);
10133 if (bits < HOST_BITS_PER_WIDE_INT)
10135 bool negative = ((val >> (bits - 1)) & 1) != 0;
10137 val |= (~(unsigned HOST_WIDE_INT) 0) << (bits - 1) << 1;
10139 val &= ~((~(unsigned HOST_WIDE_INT) 0) << (bits - 1) << 1);
10145 /* Return value of a constant X and sign-extend it. */
10148 widest_int_cst_value (const_tree x)
10150 unsigned bits = TYPE_PRECISION (TREE_TYPE (x));
10151 unsigned HOST_WIDEST_INT val = TREE_INT_CST_LOW (x);
10153 #if HOST_BITS_PER_WIDEST_INT > HOST_BITS_PER_WIDE_INT
10154 gcc_assert (HOST_BITS_PER_WIDEST_INT >= 2 * HOST_BITS_PER_WIDE_INT);
10155 val |= (((unsigned HOST_WIDEST_INT) TREE_INT_CST_HIGH (x))
10156 << HOST_BITS_PER_WIDE_INT);
10158 /* Make sure the sign-extended value will fit in a HOST_WIDE_INT. */
10159 gcc_assert (TREE_INT_CST_HIGH (x) == 0
10160 || TREE_INT_CST_HIGH (x) == -1);
10163 if (bits < HOST_BITS_PER_WIDEST_INT)
10165 bool negative = ((val >> (bits - 1)) & 1) != 0;
10167 val |= (~(unsigned HOST_WIDEST_INT) 0) << (bits - 1) << 1;
10169 val &= ~((~(unsigned HOST_WIDEST_INT) 0) << (bits - 1) << 1);
10175 /* If TYPE is an integral type, return an equivalent type which is
10176 unsigned iff UNSIGNEDP is true. If TYPE is not an integral type,
10177 return TYPE itself. */
10180 signed_or_unsigned_type_for (int unsignedp, tree type)
10183 if (POINTER_TYPE_P (type))
10185 /* If the pointer points to the normal address space, use the
10186 size_type_node. Otherwise use an appropriate size for the pointer
10187 based on the named address space it points to. */
10188 if (!TYPE_ADDR_SPACE (TREE_TYPE (t)))
10189 t = size_type_node;
10191 return lang_hooks.types.type_for_size (TYPE_PRECISION (t), unsignedp);
10194 if (!INTEGRAL_TYPE_P (t) || TYPE_UNSIGNED (t) == unsignedp)
10197 return lang_hooks.types.type_for_size (TYPE_PRECISION (t), unsignedp);
10200 /* Returns unsigned variant of TYPE. */
10203 unsigned_type_for (tree type)
10205 return signed_or_unsigned_type_for (1, type);
10208 /* Returns signed variant of TYPE. */
10211 signed_type_for (tree type)
10213 return signed_or_unsigned_type_for (0, type);
10216 /* Returns the largest value obtainable by casting something in INNER type to
10220 upper_bound_in_type (tree outer, tree inner)
10223 unsigned int det = 0;
10224 unsigned oprec = TYPE_PRECISION (outer);
10225 unsigned iprec = TYPE_PRECISION (inner);
10228 /* Compute a unique number for every combination. */
10229 det |= (oprec > iprec) ? 4 : 0;
10230 det |= TYPE_UNSIGNED (outer) ? 2 : 0;
10231 det |= TYPE_UNSIGNED (inner) ? 1 : 0;
10233 /* Determine the exponent to use. */
10238 /* oprec <= iprec, outer: signed, inner: don't care. */
10243 /* oprec <= iprec, outer: unsigned, inner: don't care. */
10247 /* oprec > iprec, outer: signed, inner: signed. */
10251 /* oprec > iprec, outer: signed, inner: unsigned. */
10255 /* oprec > iprec, outer: unsigned, inner: signed. */
10259 /* oprec > iprec, outer: unsigned, inner: unsigned. */
10263 gcc_unreachable ();
10266 /* Compute 2^^prec - 1. */
10267 if (prec <= HOST_BITS_PER_WIDE_INT)
10270 high.low = ((~(unsigned HOST_WIDE_INT) 0)
10271 >> (HOST_BITS_PER_WIDE_INT - prec));
10275 high.high = ((~(unsigned HOST_WIDE_INT) 0)
10276 >> (2 * HOST_BITS_PER_WIDE_INT - prec));
10277 high.low = ~(unsigned HOST_WIDE_INT) 0;
10280 return double_int_to_tree (outer, high);
10283 /* Returns the smallest value obtainable by casting something in INNER type to
10287 lower_bound_in_type (tree outer, tree inner)
10290 unsigned oprec = TYPE_PRECISION (outer);
10291 unsigned iprec = TYPE_PRECISION (inner);
10293 /* If OUTER type is unsigned, we can definitely cast 0 to OUTER type
10295 if (TYPE_UNSIGNED (outer)
10296 /* If we are widening something of an unsigned type, OUTER type
10297 contains all values of INNER type. In particular, both INNER
10298 and OUTER types have zero in common. */
10299 || (oprec > iprec && TYPE_UNSIGNED (inner)))
10300 low.low = low.high = 0;
10303 /* If we are widening a signed type to another signed type, we
10304 want to obtain -2^^(iprec-1). If we are keeping the
10305 precision or narrowing to a signed type, we want to obtain
10307 unsigned prec = oprec > iprec ? iprec : oprec;
10309 if (prec <= HOST_BITS_PER_WIDE_INT)
10311 low.high = ~(unsigned HOST_WIDE_INT) 0;
10312 low.low = (~(unsigned HOST_WIDE_INT) 0) << (prec - 1);
10316 low.high = ((~(unsigned HOST_WIDE_INT) 0)
10317 << (prec - HOST_BITS_PER_WIDE_INT - 1));
10322 return double_int_to_tree (outer, low);
10325 /* Return nonzero if two operands that are suitable for PHI nodes are
10326 necessarily equal. Specifically, both ARG0 and ARG1 must be either
10327 SSA_NAME or invariant. Note that this is strictly an optimization.
10328 That is, callers of this function can directly call operand_equal_p
10329 and get the same result, only slower. */
10332 operand_equal_for_phi_arg_p (const_tree arg0, const_tree arg1)
10336 if (TREE_CODE (arg0) == SSA_NAME || TREE_CODE (arg1) == SSA_NAME)
10338 return operand_equal_p (arg0, arg1, 0);
10341 /* Returns number of zeros at the end of binary representation of X.
10343 ??? Use ffs if available? */
10346 num_ending_zeros (const_tree x)
10348 unsigned HOST_WIDE_INT fr, nfr;
10349 unsigned num, abits;
10350 tree type = TREE_TYPE (x);
10352 if (TREE_INT_CST_LOW (x) == 0)
10354 num = HOST_BITS_PER_WIDE_INT;
10355 fr = TREE_INT_CST_HIGH (x);
10360 fr = TREE_INT_CST_LOW (x);
10363 for (abits = HOST_BITS_PER_WIDE_INT / 2; abits; abits /= 2)
10366 if (nfr << abits == fr)
10373 if (num > TYPE_PRECISION (type))
10374 num = TYPE_PRECISION (type);
10376 return build_int_cst_type (type, num);
10380 #define WALK_SUBTREE(NODE) \
10383 result = walk_tree_1 (&(NODE), func, data, pset, lh); \
10389 /* This is a subroutine of walk_tree that walks field of TYPE that are to
10390 be walked whenever a type is seen in the tree. Rest of operands and return
10391 value are as for walk_tree. */
10394 walk_type_fields (tree type, walk_tree_fn func, void *data,
10395 struct pointer_set_t *pset, walk_tree_lh lh)
10397 tree result = NULL_TREE;
10399 switch (TREE_CODE (type))
10402 case REFERENCE_TYPE:
10403 /* We have to worry about mutually recursive pointers. These can't
10404 be written in C. They can in Ada. It's pathological, but
10405 there's an ACATS test (c38102a) that checks it. Deal with this
10406 by checking if we're pointing to another pointer, that one
10407 points to another pointer, that one does too, and we have no htab.
10408 If so, get a hash table. We check three levels deep to avoid
10409 the cost of the hash table if we don't need one. */
10410 if (POINTER_TYPE_P (TREE_TYPE (type))
10411 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (type)))
10412 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (TREE_TYPE (type))))
10415 result = walk_tree_without_duplicates (&TREE_TYPE (type),
10423 /* ... fall through ... */
10426 WALK_SUBTREE (TREE_TYPE (type));
10430 WALK_SUBTREE (TYPE_METHOD_BASETYPE (type));
10432 /* Fall through. */
10434 case FUNCTION_TYPE:
10435 WALK_SUBTREE (TREE_TYPE (type));
10439 /* We never want to walk into default arguments. */
10440 for (arg = TYPE_ARG_TYPES (type); arg; arg = TREE_CHAIN (arg))
10441 WALK_SUBTREE (TREE_VALUE (arg));
10446 /* Don't follow this nodes's type if a pointer for fear that
10447 we'll have infinite recursion. If we have a PSET, then we
10450 || (!POINTER_TYPE_P (TREE_TYPE (type))
10451 && TREE_CODE (TREE_TYPE (type)) != OFFSET_TYPE))
10452 WALK_SUBTREE (TREE_TYPE (type));
10453 WALK_SUBTREE (TYPE_DOMAIN (type));
10457 WALK_SUBTREE (TREE_TYPE (type));
10458 WALK_SUBTREE (TYPE_OFFSET_BASETYPE (type));
10468 /* Apply FUNC to all the sub-trees of TP in a pre-order traversal. FUNC is
10469 called with the DATA and the address of each sub-tree. If FUNC returns a
10470 non-NULL value, the traversal is stopped, and the value returned by FUNC
10471 is returned. If PSET is non-NULL it is used to record the nodes visited,
10472 and to avoid visiting a node more than once. */
10475 walk_tree_1 (tree *tp, walk_tree_fn func, void *data,
10476 struct pointer_set_t *pset, walk_tree_lh lh)
10478 enum tree_code code;
10482 #define WALK_SUBTREE_TAIL(NODE) \
10486 goto tail_recurse; \
10491 /* Skip empty subtrees. */
10495 /* Don't walk the same tree twice, if the user has requested
10496 that we avoid doing so. */
10497 if (pset && pointer_set_insert (pset, *tp))
10500 /* Call the function. */
10502 result = (*func) (tp, &walk_subtrees, data);
10504 /* If we found something, return it. */
10508 code = TREE_CODE (*tp);
10510 /* Even if we didn't, FUNC may have decided that there was nothing
10511 interesting below this point in the tree. */
10512 if (!walk_subtrees)
10514 /* But we still need to check our siblings. */
10515 if (code == TREE_LIST)
10516 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp));
10517 else if (code == OMP_CLAUSE)
10518 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
10525 result = (*lh) (tp, &walk_subtrees, func, data, pset);
10526 if (result || !walk_subtrees)
10533 case IDENTIFIER_NODE:
10540 case PLACEHOLDER_EXPR:
10544 /* None of these have subtrees other than those already walked
10549 WALK_SUBTREE (TREE_VALUE (*tp));
10550 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp));
10555 int len = TREE_VEC_LENGTH (*tp);
10560 /* Walk all elements but the first. */
10562 WALK_SUBTREE (TREE_VEC_ELT (*tp, len));
10564 /* Now walk the first one as a tail call. */
10565 WALK_SUBTREE_TAIL (TREE_VEC_ELT (*tp, 0));
10569 WALK_SUBTREE (TREE_REALPART (*tp));
10570 WALK_SUBTREE_TAIL (TREE_IMAGPART (*tp));
10574 unsigned HOST_WIDE_INT idx;
10575 constructor_elt *ce;
10578 VEC_iterate(constructor_elt, CONSTRUCTOR_ELTS (*tp), idx, ce);
10580 WALK_SUBTREE (ce->value);
10585 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, 0));
10590 for (decl = BIND_EXPR_VARS (*tp); decl; decl = DECL_CHAIN (decl))
10592 /* Walk the DECL_INITIAL and DECL_SIZE. We don't want to walk
10593 into declarations that are just mentioned, rather than
10594 declared; they don't really belong to this part of the tree.
10595 And, we can see cycles: the initializer for a declaration
10596 can refer to the declaration itself. */
10597 WALK_SUBTREE (DECL_INITIAL (decl));
10598 WALK_SUBTREE (DECL_SIZE (decl));
10599 WALK_SUBTREE (DECL_SIZE_UNIT (decl));
10601 WALK_SUBTREE_TAIL (BIND_EXPR_BODY (*tp));
10604 case STATEMENT_LIST:
10606 tree_stmt_iterator i;
10607 for (i = tsi_start (*tp); !tsi_end_p (i); tsi_next (&i))
10608 WALK_SUBTREE (*tsi_stmt_ptr (i));
10613 switch (OMP_CLAUSE_CODE (*tp))
10615 case OMP_CLAUSE_PRIVATE:
10616 case OMP_CLAUSE_SHARED:
10617 case OMP_CLAUSE_FIRSTPRIVATE:
10618 case OMP_CLAUSE_COPYIN:
10619 case OMP_CLAUSE_COPYPRIVATE:
10620 case OMP_CLAUSE_FINAL:
10621 case OMP_CLAUSE_IF:
10622 case OMP_CLAUSE_NUM_THREADS:
10623 case OMP_CLAUSE_SCHEDULE:
10624 WALK_SUBTREE (OMP_CLAUSE_OPERAND (*tp, 0));
10627 case OMP_CLAUSE_NOWAIT:
10628 case OMP_CLAUSE_ORDERED:
10629 case OMP_CLAUSE_DEFAULT:
10630 case OMP_CLAUSE_UNTIED:
10631 case OMP_CLAUSE_MERGEABLE:
10632 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
10634 case OMP_CLAUSE_LASTPRIVATE:
10635 WALK_SUBTREE (OMP_CLAUSE_DECL (*tp));
10636 WALK_SUBTREE (OMP_CLAUSE_LASTPRIVATE_STMT (*tp));
10637 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
10639 case OMP_CLAUSE_COLLAPSE:
10642 for (i = 0; i < 3; i++)
10643 WALK_SUBTREE (OMP_CLAUSE_OPERAND (*tp, i));
10644 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
10647 case OMP_CLAUSE_REDUCTION:
10650 for (i = 0; i < 4; i++)
10651 WALK_SUBTREE (OMP_CLAUSE_OPERAND (*tp, i));
10652 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
10656 gcc_unreachable ();
10664 /* TARGET_EXPRs are peculiar: operands 1 and 3 can be the same.
10665 But, we only want to walk once. */
10666 len = (TREE_OPERAND (*tp, 3) == TREE_OPERAND (*tp, 1)) ? 2 : 3;
10667 for (i = 0; i < len; ++i)
10668 WALK_SUBTREE (TREE_OPERAND (*tp, i));
10669 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, len));
10673 /* If this is a TYPE_DECL, walk into the fields of the type that it's
10674 defining. We only want to walk into these fields of a type in this
10675 case and not in the general case of a mere reference to the type.
10677 The criterion is as follows: if the field can be an expression, it
10678 must be walked only here. This should be in keeping with the fields
10679 that are directly gimplified in gimplify_type_sizes in order for the
10680 mark/copy-if-shared/unmark machinery of the gimplifier to work with
10681 variable-sized types.
10683 Note that DECLs get walked as part of processing the BIND_EXPR. */
10684 if (TREE_CODE (DECL_EXPR_DECL (*tp)) == TYPE_DECL)
10686 tree *type_p = &TREE_TYPE (DECL_EXPR_DECL (*tp));
10687 if (TREE_CODE (*type_p) == ERROR_MARK)
10690 /* Call the function for the type. See if it returns anything or
10691 doesn't want us to continue. If we are to continue, walk both
10692 the normal fields and those for the declaration case. */
10693 result = (*func) (type_p, &walk_subtrees, data);
10694 if (result || !walk_subtrees)
10697 /* But do not walk a pointed-to type since it may itself need to
10698 be walked in the declaration case if it isn't anonymous. */
10699 if (!POINTER_TYPE_P (*type_p))
10701 result = walk_type_fields (*type_p, func, data, pset, lh);
10706 /* If this is a record type, also walk the fields. */
10707 if (RECORD_OR_UNION_TYPE_P (*type_p))
10711 for (field = TYPE_FIELDS (*type_p); field;
10712 field = DECL_CHAIN (field))
10714 /* We'd like to look at the type of the field, but we can
10715 easily get infinite recursion. So assume it's pointed
10716 to elsewhere in the tree. Also, ignore things that
10718 if (TREE_CODE (field) != FIELD_DECL)
10721 WALK_SUBTREE (DECL_FIELD_OFFSET (field));
10722 WALK_SUBTREE (DECL_SIZE (field));
10723 WALK_SUBTREE (DECL_SIZE_UNIT (field));
10724 if (TREE_CODE (*type_p) == QUAL_UNION_TYPE)
10725 WALK_SUBTREE (DECL_QUALIFIER (field));
10729 /* Same for scalar types. */
10730 else if (TREE_CODE (*type_p) == BOOLEAN_TYPE
10731 || TREE_CODE (*type_p) == ENUMERAL_TYPE
10732 || TREE_CODE (*type_p) == INTEGER_TYPE
10733 || TREE_CODE (*type_p) == FIXED_POINT_TYPE
10734 || TREE_CODE (*type_p) == REAL_TYPE)
10736 WALK_SUBTREE (TYPE_MIN_VALUE (*type_p));
10737 WALK_SUBTREE (TYPE_MAX_VALUE (*type_p));
10740 WALK_SUBTREE (TYPE_SIZE (*type_p));
10741 WALK_SUBTREE_TAIL (TYPE_SIZE_UNIT (*type_p));
10746 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code)))
10750 /* Walk over all the sub-trees of this operand. */
10751 len = TREE_OPERAND_LENGTH (*tp);
10753 /* Go through the subtrees. We need to do this in forward order so
10754 that the scope of a FOR_EXPR is handled properly. */
10757 for (i = 0; i < len - 1; ++i)
10758 WALK_SUBTREE (TREE_OPERAND (*tp, i));
10759 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, len - 1));
10762 /* If this is a type, walk the needed fields in the type. */
10763 else if (TYPE_P (*tp))
10764 return walk_type_fields (*tp, func, data, pset, lh);
10768 /* We didn't find what we were looking for. */
10771 #undef WALK_SUBTREE_TAIL
10773 #undef WALK_SUBTREE
10775 /* Like walk_tree, but does not walk duplicate nodes more than once. */
10778 walk_tree_without_duplicates_1 (tree *tp, walk_tree_fn func, void *data,
10782 struct pointer_set_t *pset;
10784 pset = pointer_set_create ();
10785 result = walk_tree_1 (tp, func, data, pset, lh);
10786 pointer_set_destroy (pset);
10792 tree_block (tree t)
10794 char const c = TREE_CODE_CLASS (TREE_CODE (t));
10796 if (IS_EXPR_CODE_CLASS (c))
10797 return &t->exp.block;
10798 gcc_unreachable ();
10802 /* Create a nameless artificial label and put it in the current
10803 function context. The label has a location of LOC. Returns the
10804 newly created label. */
10807 create_artificial_label (location_t loc)
10809 tree lab = build_decl (loc,
10810 LABEL_DECL, NULL_TREE, void_type_node);
10812 DECL_ARTIFICIAL (lab) = 1;
10813 DECL_IGNORED_P (lab) = 1;
10814 DECL_CONTEXT (lab) = current_function_decl;
10818 /* Given a tree, try to return a useful variable name that we can use
10819 to prefix a temporary that is being assigned the value of the tree.
10820 I.E. given <temp> = &A, return A. */
10825 tree stripped_decl;
10828 STRIP_NOPS (stripped_decl);
10829 if (DECL_P (stripped_decl) && DECL_NAME (stripped_decl))
10830 return IDENTIFIER_POINTER (DECL_NAME (stripped_decl));
10833 switch (TREE_CODE (stripped_decl))
10836 return get_name (TREE_OPERAND (stripped_decl, 0));
10843 /* Return true if TYPE has a variable argument list. */
10846 stdarg_p (const_tree fntype)
10848 function_args_iterator args_iter;
10849 tree n = NULL_TREE, t;
10854 FOREACH_FUNCTION_ARGS(fntype, t, args_iter)
10859 return n != NULL_TREE && n != void_type_node;
10862 /* Return true if TYPE has a prototype. */
10865 prototype_p (tree fntype)
10869 gcc_assert (fntype != NULL_TREE);
10871 t = TYPE_ARG_TYPES (fntype);
10872 return (t != NULL_TREE);
10875 /* If BLOCK is inlined from an __attribute__((__artificial__))
10876 routine, return pointer to location from where it has been
10879 block_nonartificial_location (tree block)
10881 location_t *ret = NULL;
10883 while (block && TREE_CODE (block) == BLOCK
10884 && BLOCK_ABSTRACT_ORIGIN (block))
10886 tree ao = BLOCK_ABSTRACT_ORIGIN (block);
10888 while (TREE_CODE (ao) == BLOCK
10889 && BLOCK_ABSTRACT_ORIGIN (ao)
10890 && BLOCK_ABSTRACT_ORIGIN (ao) != ao)
10891 ao = BLOCK_ABSTRACT_ORIGIN (ao);
10893 if (TREE_CODE (ao) == FUNCTION_DECL)
10895 /* If AO is an artificial inline, point RET to the
10896 call site locus at which it has been inlined and continue
10897 the loop, in case AO's caller is also an artificial
10899 if (DECL_DECLARED_INLINE_P (ao)
10900 && lookup_attribute ("artificial", DECL_ATTRIBUTES (ao)))
10901 ret = &BLOCK_SOURCE_LOCATION (block);
10905 else if (TREE_CODE (ao) != BLOCK)
10908 block = BLOCK_SUPERCONTEXT (block);
10914 /* If EXP is inlined from an __attribute__((__artificial__))
10915 function, return the location of the original call expression. */
10918 tree_nonartificial_location (tree exp)
10920 location_t *loc = block_nonartificial_location (TREE_BLOCK (exp));
10925 return EXPR_LOCATION (exp);
10929 /* These are the hash table functions for the hash table of OPTIMIZATION_NODEq
10932 /* Return the hash code code X, an OPTIMIZATION_NODE or TARGET_OPTION code. */
10935 cl_option_hash_hash (const void *x)
10937 const_tree const t = (const_tree) x;
10941 hashval_t hash = 0;
10943 if (TREE_CODE (t) == OPTIMIZATION_NODE)
10945 p = (const char *)TREE_OPTIMIZATION (t);
10946 len = sizeof (struct cl_optimization);
10949 else if (TREE_CODE (t) == TARGET_OPTION_NODE)
10951 p = (const char *)TREE_TARGET_OPTION (t);
10952 len = sizeof (struct cl_target_option);
10956 gcc_unreachable ();
10958 /* assume most opt flags are just 0/1, some are 2-3, and a few might be
10960 for (i = 0; i < len; i++)
10962 hash = (hash << 4) ^ ((i << 2) | p[i]);
10967 /* Return nonzero if the value represented by *X (an OPTIMIZATION or
10968 TARGET_OPTION tree node) is the same as that given by *Y, which is the
10972 cl_option_hash_eq (const void *x, const void *y)
10974 const_tree const xt = (const_tree) x;
10975 const_tree const yt = (const_tree) y;
10980 if (TREE_CODE (xt) != TREE_CODE (yt))
10983 if (TREE_CODE (xt) == OPTIMIZATION_NODE)
10985 xp = (const char *)TREE_OPTIMIZATION (xt);
10986 yp = (const char *)TREE_OPTIMIZATION (yt);
10987 len = sizeof (struct cl_optimization);
10990 else if (TREE_CODE (xt) == TARGET_OPTION_NODE)
10992 xp = (const char *)TREE_TARGET_OPTION (xt);
10993 yp = (const char *)TREE_TARGET_OPTION (yt);
10994 len = sizeof (struct cl_target_option);
10998 gcc_unreachable ();
11000 return (memcmp (xp, yp, len) == 0);
11003 /* Build an OPTIMIZATION_NODE based on the current options. */
11006 build_optimization_node (void)
11011 /* Use the cache of optimization nodes. */
11013 cl_optimization_save (TREE_OPTIMIZATION (cl_optimization_node),
11016 slot = htab_find_slot (cl_option_hash_table, cl_optimization_node, INSERT);
11020 /* Insert this one into the hash table. */
11021 t = cl_optimization_node;
11024 /* Make a new node for next time round. */
11025 cl_optimization_node = make_node (OPTIMIZATION_NODE);
11031 /* Build a TARGET_OPTION_NODE based on the current options. */
11034 build_target_option_node (void)
11039 /* Use the cache of optimization nodes. */
11041 cl_target_option_save (TREE_TARGET_OPTION (cl_target_option_node),
11044 slot = htab_find_slot (cl_option_hash_table, cl_target_option_node, INSERT);
11048 /* Insert this one into the hash table. */
11049 t = cl_target_option_node;
11052 /* Make a new node for next time round. */
11053 cl_target_option_node = make_node (TARGET_OPTION_NODE);
11059 /* Determine the "ultimate origin" of a block. The block may be an inlined
11060 instance of an inlined instance of a block which is local to an inline
11061 function, so we have to trace all of the way back through the origin chain
11062 to find out what sort of node actually served as the original seed for the
11066 block_ultimate_origin (const_tree block)
11068 tree immediate_origin = BLOCK_ABSTRACT_ORIGIN (block);
11070 /* output_inline_function sets BLOCK_ABSTRACT_ORIGIN for all the
11071 nodes in the function to point to themselves; ignore that if
11072 we're trying to output the abstract instance of this function. */
11073 if (BLOCK_ABSTRACT (block) && immediate_origin == block)
11076 if (immediate_origin == NULL_TREE)
11081 tree lookahead = immediate_origin;
11085 ret_val = lookahead;
11086 lookahead = (TREE_CODE (ret_val) == BLOCK
11087 ? BLOCK_ABSTRACT_ORIGIN (ret_val) : NULL);
11089 while (lookahead != NULL && lookahead != ret_val);
11091 /* The block's abstract origin chain may not be the *ultimate* origin of
11092 the block. It could lead to a DECL that has an abstract origin set.
11093 If so, we want that DECL's abstract origin (which is what DECL_ORIGIN
11094 will give us if it has one). Note that DECL's abstract origins are
11095 supposed to be the most distant ancestor (or so decl_ultimate_origin
11096 claims), so we don't need to loop following the DECL origins. */
11097 if (DECL_P (ret_val))
11098 return DECL_ORIGIN (ret_val);
11104 /* Return true if T1 and T2 are equivalent lists. */
11107 list_equal_p (const_tree t1, const_tree t2)
11109 for (; t1 && t2; t1 = TREE_CHAIN (t1) , t2 = TREE_CHAIN (t2))
11110 if (TREE_VALUE (t1) != TREE_VALUE (t2))
11115 /* Return true iff conversion in EXP generates no instruction. Mark
11116 it inline so that we fully inline into the stripping functions even
11117 though we have two uses of this function. */
11120 tree_nop_conversion (const_tree exp)
11122 tree outer_type, inner_type;
11124 if (!CONVERT_EXPR_P (exp)
11125 && TREE_CODE (exp) != NON_LVALUE_EXPR)
11127 if (TREE_OPERAND (exp, 0) == error_mark_node)
11130 outer_type = TREE_TYPE (exp);
11131 inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
11136 /* Use precision rather then machine mode when we can, which gives
11137 the correct answer even for submode (bit-field) types. */
11138 if ((INTEGRAL_TYPE_P (outer_type)
11139 || POINTER_TYPE_P (outer_type)
11140 || TREE_CODE (outer_type) == OFFSET_TYPE)
11141 && (INTEGRAL_TYPE_P (inner_type)
11142 || POINTER_TYPE_P (inner_type)
11143 || TREE_CODE (inner_type) == OFFSET_TYPE))
11144 return TYPE_PRECISION (outer_type) == TYPE_PRECISION (inner_type);
11146 /* Otherwise fall back on comparing machine modes (e.g. for
11147 aggregate types, floats). */
11148 return TYPE_MODE (outer_type) == TYPE_MODE (inner_type);
11151 /* Return true iff conversion in EXP generates no instruction. Don't
11152 consider conversions changing the signedness. */
11155 tree_sign_nop_conversion (const_tree exp)
11157 tree outer_type, inner_type;
11159 if (!tree_nop_conversion (exp))
11162 outer_type = TREE_TYPE (exp);
11163 inner_type = TREE_TYPE (TREE_OPERAND (exp, 0));
11165 return (TYPE_UNSIGNED (outer_type) == TYPE_UNSIGNED (inner_type)
11166 && POINTER_TYPE_P (outer_type) == POINTER_TYPE_P (inner_type));
11169 /* Strip conversions from EXP according to tree_nop_conversion and
11170 return the resulting expression. */
11173 tree_strip_nop_conversions (tree exp)
11175 while (tree_nop_conversion (exp))
11176 exp = TREE_OPERAND (exp, 0);
11180 /* Strip conversions from EXP according to tree_sign_nop_conversion
11181 and return the resulting expression. */
11184 tree_strip_sign_nop_conversions (tree exp)
11186 while (tree_sign_nop_conversion (exp))
11187 exp = TREE_OPERAND (exp, 0);
11191 /* Strip out all handled components that produce invariant
11195 strip_invariant_refs (const_tree op)
11197 while (handled_component_p (op))
11199 switch (TREE_CODE (op))
11202 case ARRAY_RANGE_REF:
11203 if (!is_gimple_constant (TREE_OPERAND (op, 1))
11204 || TREE_OPERAND (op, 2) != NULL_TREE
11205 || TREE_OPERAND (op, 3) != NULL_TREE)
11209 case COMPONENT_REF:
11210 if (TREE_OPERAND (op, 2) != NULL_TREE)
11216 op = TREE_OPERAND (op, 0);
11222 static GTY(()) tree gcc_eh_personality_decl;
11224 /* Return the GCC personality function decl. */
11227 lhd_gcc_personality (void)
11229 if (!gcc_eh_personality_decl)
11230 gcc_eh_personality_decl = build_personality_function ("gcc");
11231 return gcc_eh_personality_decl;
11234 /* Try to find a base info of BINFO that would have its field decl at offset
11235 OFFSET within the BINFO type and which is of EXPECTED_TYPE. If it can be
11236 found, return, otherwise return NULL_TREE. */
11239 get_binfo_at_offset (tree binfo, HOST_WIDE_INT offset, tree expected_type)
11241 tree type = BINFO_TYPE (binfo);
11245 HOST_WIDE_INT pos, size;
11249 if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (expected_type))
11254 for (fld = TYPE_FIELDS (type); fld; fld = DECL_CHAIN (fld))
11256 if (TREE_CODE (fld) != FIELD_DECL)
11259 pos = int_bit_position (fld);
11260 size = tree_low_cst (DECL_SIZE (fld), 1);
11261 if (pos <= offset && (pos + size) > offset)
11264 if (!fld || TREE_CODE (TREE_TYPE (fld)) != RECORD_TYPE)
11267 if (!DECL_ARTIFICIAL (fld))
11269 binfo = TYPE_BINFO (TREE_TYPE (fld));
11273 /* Offset 0 indicates the primary base, whose vtable contents are
11274 represented in the binfo for the derived class. */
11275 else if (offset != 0)
11277 tree base_binfo, found_binfo = NULL_TREE;
11278 for (i = 0; BINFO_BASE_ITERATE (binfo, i, base_binfo); i++)
11279 if (TREE_TYPE (base_binfo) == TREE_TYPE (fld))
11281 found_binfo = base_binfo;
11286 binfo = found_binfo;
11289 type = TREE_TYPE (fld);
11294 /* Returns true if X is a typedef decl. */
11297 is_typedef_decl (tree x)
11299 return (x && TREE_CODE (x) == TYPE_DECL
11300 && DECL_ORIGINAL_TYPE (x) != NULL_TREE);
11303 /* Returns true iff TYPE is a type variant created for a typedef. */
11306 typedef_variant_p (tree type)
11308 return is_typedef_decl (TYPE_NAME (type));
11311 /* Warn about a use of an identifier which was marked deprecated. */
11313 warn_deprecated_use (tree node, tree attr)
11317 if (node == 0 || !warn_deprecated_decl)
11323 attr = DECL_ATTRIBUTES (node);
11324 else if (TYPE_P (node))
11326 tree decl = TYPE_STUB_DECL (node);
11328 attr = lookup_attribute ("deprecated",
11329 TYPE_ATTRIBUTES (TREE_TYPE (decl)));
11334 attr = lookup_attribute ("deprecated", attr);
11337 msg = TREE_STRING_POINTER (TREE_VALUE (TREE_VALUE (attr)));
11343 expanded_location xloc = expand_location (DECL_SOURCE_LOCATION (node));
11345 warning (OPT_Wdeprecated_declarations,
11346 "%qD is deprecated (declared at %s:%d): %s",
11347 node, xloc.file, xloc.line, msg);
11349 warning (OPT_Wdeprecated_declarations,
11350 "%qD is deprecated (declared at %s:%d)",
11351 node, xloc.file, xloc.line);
11353 else if (TYPE_P (node))
11355 tree what = NULL_TREE;
11356 tree decl = TYPE_STUB_DECL (node);
11358 if (TYPE_NAME (node))
11360 if (TREE_CODE (TYPE_NAME (node)) == IDENTIFIER_NODE)
11361 what = TYPE_NAME (node);
11362 else if (TREE_CODE (TYPE_NAME (node)) == TYPE_DECL
11363 && DECL_NAME (TYPE_NAME (node)))
11364 what = DECL_NAME (TYPE_NAME (node));
11369 expanded_location xloc
11370 = expand_location (DECL_SOURCE_LOCATION (decl));
11374 warning (OPT_Wdeprecated_declarations,
11375 "%qE is deprecated (declared at %s:%d): %s",
11376 what, xloc.file, xloc.line, msg);
11378 warning (OPT_Wdeprecated_declarations,
11379 "%qE is deprecated (declared at %s:%d)", what,
11380 xloc.file, xloc.line);
11385 warning (OPT_Wdeprecated_declarations,
11386 "type is deprecated (declared at %s:%d): %s",
11387 xloc.file, xloc.line, msg);
11389 warning (OPT_Wdeprecated_declarations,
11390 "type is deprecated (declared at %s:%d)",
11391 xloc.file, xloc.line);
11399 warning (OPT_Wdeprecated_declarations, "%qE is deprecated: %s",
11402 warning (OPT_Wdeprecated_declarations, "%qE is deprecated", what);
11407 warning (OPT_Wdeprecated_declarations, "type is deprecated: %s",
11410 warning (OPT_Wdeprecated_declarations, "type is deprecated");
11416 #include "gt-tree.h"