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
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* This file contains the low level primitives for operating on tree nodes,
23 including allocation, list operations, interning of identifiers,
24 construction of data type nodes and statement nodes,
25 and construction of type conversion nodes. It also contains
26 tables index by tree code that describe how to take apart
29 It is intended to be language-independent, but occasionally
30 calls language-dependent routines defined (for C) in typecheck.c. */
34 #include "coretypes.h"
47 #include "langhooks.h"
48 #include "tree-iterator.h"
49 #include "basic-block.h"
50 #include "tree-flow.h"
52 #include "pointer-set.h"
53 #include "fixed-value.h"
55 /* Tree code classes. */
57 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
58 #define END_OF_BASE_TREE_CODES tcc_exceptional,
60 const enum tree_code_class tree_code_type[] = {
61 #include "all-tree.def"
65 #undef END_OF_BASE_TREE_CODES
67 /* Table indexed by tree code giving number of expression
68 operands beyond the fixed part of the node structure.
69 Not used for types or decls. */
71 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
72 #define END_OF_BASE_TREE_CODES 0,
74 const unsigned char tree_code_length[] = {
75 #include "all-tree.def"
79 #undef END_OF_BASE_TREE_CODES
81 /* Names of tree components.
82 Used for printing out the tree and error messages. */
83 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
84 #define END_OF_BASE_TREE_CODES "@dummy",
86 const char *const tree_code_name[] = {
87 #include "all-tree.def"
91 #undef END_OF_BASE_TREE_CODES
93 /* Each tree code class has an associated string representation.
94 These must correspond to the tree_code_class entries. */
96 const char *const tree_code_class_strings[] =
111 /* obstack.[ch] explicitly declined to prototype this. */
112 extern int _obstack_allocated_p (struct obstack *h, void *obj);
114 #ifdef GATHER_STATISTICS
115 /* Statistics-gathering stuff. */
117 int tree_node_counts[(int) all_kinds];
118 int tree_node_sizes[(int) all_kinds];
120 /* Keep in sync with tree.h:enum tree_node_kind. */
121 static const char * const tree_node_kind_names[] = {
141 #endif /* GATHER_STATISTICS */
143 /* Unique id for next decl created. */
144 static GTY(()) int next_decl_uid;
145 /* Unique id for next type created. */
146 static GTY(()) int next_type_uid = 1;
148 /* Since we cannot rehash a type after it is in the table, we have to
149 keep the hash code. */
151 struct GTY(()) type_hash {
156 /* Initial size of the hash table (rounded to next prime). */
157 #define TYPE_HASH_INITIAL_SIZE 1000
159 /* Now here is the hash table. When recording a type, it is added to
160 the slot whose index is the hash code. Note that the hash table is
161 used for several kinds of types (function types, array types and
162 array index range types, for now). While all these live in the
163 same table, they are completely independent, and the hash code is
164 computed differently for each of these. */
166 static GTY ((if_marked ("type_hash_marked_p"), param_is (struct type_hash)))
167 htab_t type_hash_table;
169 /* Hash table and temporary node for larger integer const values. */
170 static GTY (()) tree int_cst_node;
171 static GTY ((if_marked ("ggc_marked_p"), param_is (union tree_node)))
172 htab_t int_cst_hash_table;
174 /* Hash table for optimization flags and target option flags. Use the same
175 hash table for both sets of options. Nodes for building the current
176 optimization and target option nodes. The assumption is most of the time
177 the options created will already be in the hash table, so we avoid
178 allocating and freeing up a node repeatably. */
179 static GTY (()) tree cl_optimization_node;
180 static GTY (()) tree cl_target_option_node;
181 static GTY ((if_marked ("ggc_marked_p"), param_is (union tree_node)))
182 htab_t cl_option_hash_table;
184 /* General tree->tree mapping structure for use in hash tables. */
187 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map)))
188 htab_t debug_expr_for_decl;
190 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map)))
191 htab_t value_expr_for_decl;
193 static GTY ((if_marked ("tree_priority_map_marked_p"),
194 param_is (struct tree_priority_map)))
195 htab_t init_priority_for_decl;
197 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map)))
198 htab_t restrict_base_for_decl;
200 static void set_type_quals (tree, int);
201 static int type_hash_eq (const void *, const void *);
202 static hashval_t type_hash_hash (const void *);
203 static hashval_t int_cst_hash_hash (const void *);
204 static int int_cst_hash_eq (const void *, const void *);
205 static hashval_t cl_option_hash_hash (const void *);
206 static int cl_option_hash_eq (const void *, const void *);
207 static void print_type_hash_statistics (void);
208 static void print_debug_expr_statistics (void);
209 static void print_value_expr_statistics (void);
210 static int type_hash_marked_p (const void *);
211 static unsigned int type_hash_list (const_tree, hashval_t);
212 static unsigned int attribute_hash_list (const_tree, hashval_t);
214 tree global_trees[TI_MAX];
215 tree integer_types[itk_none];
217 unsigned char tree_contains_struct[MAX_TREE_CODES][64];
219 /* Number of operands for each OpenMP clause. */
220 unsigned const char omp_clause_num_ops[] =
222 0, /* OMP_CLAUSE_ERROR */
223 1, /* OMP_CLAUSE_PRIVATE */
224 1, /* OMP_CLAUSE_SHARED */
225 1, /* OMP_CLAUSE_FIRSTPRIVATE */
226 2, /* OMP_CLAUSE_LASTPRIVATE */
227 4, /* OMP_CLAUSE_REDUCTION */
228 1, /* OMP_CLAUSE_COPYIN */
229 1, /* OMP_CLAUSE_COPYPRIVATE */
230 1, /* OMP_CLAUSE_IF */
231 1, /* OMP_CLAUSE_NUM_THREADS */
232 1, /* OMP_CLAUSE_SCHEDULE */
233 0, /* OMP_CLAUSE_NOWAIT */
234 0, /* OMP_CLAUSE_ORDERED */
235 0, /* OMP_CLAUSE_DEFAULT */
236 3, /* OMP_CLAUSE_COLLAPSE */
237 0 /* OMP_CLAUSE_UNTIED */
240 const char * const omp_clause_code_name[] =
265 /* Initialize the hash table of types. */
266 type_hash_table = htab_create_ggc (TYPE_HASH_INITIAL_SIZE, type_hash_hash,
269 debug_expr_for_decl = htab_create_ggc (512, tree_map_hash,
272 value_expr_for_decl = htab_create_ggc (512, tree_map_hash,
274 init_priority_for_decl = htab_create_ggc (512, tree_priority_map_hash,
275 tree_priority_map_eq, 0);
276 restrict_base_for_decl = htab_create_ggc (256, tree_map_hash,
279 int_cst_hash_table = htab_create_ggc (1024, int_cst_hash_hash,
280 int_cst_hash_eq, NULL);
282 int_cst_node = make_node (INTEGER_CST);
284 cl_option_hash_table = htab_create_ggc (64, cl_option_hash_hash,
285 cl_option_hash_eq, NULL);
287 cl_optimization_node = make_node (OPTIMIZATION_NODE);
288 cl_target_option_node = make_node (TARGET_OPTION_NODE);
290 tree_contains_struct[FUNCTION_DECL][TS_DECL_NON_COMMON] = 1;
291 tree_contains_struct[TRANSLATION_UNIT_DECL][TS_DECL_NON_COMMON] = 1;
292 tree_contains_struct[TYPE_DECL][TS_DECL_NON_COMMON] = 1;
295 tree_contains_struct[CONST_DECL][TS_DECL_COMMON] = 1;
296 tree_contains_struct[VAR_DECL][TS_DECL_COMMON] = 1;
297 tree_contains_struct[PARM_DECL][TS_DECL_COMMON] = 1;
298 tree_contains_struct[RESULT_DECL][TS_DECL_COMMON] = 1;
299 tree_contains_struct[FUNCTION_DECL][TS_DECL_COMMON] = 1;
300 tree_contains_struct[TYPE_DECL][TS_DECL_COMMON] = 1;
301 tree_contains_struct[TRANSLATION_UNIT_DECL][TS_DECL_COMMON] = 1;
302 tree_contains_struct[LABEL_DECL][TS_DECL_COMMON] = 1;
303 tree_contains_struct[FIELD_DECL][TS_DECL_COMMON] = 1;
306 tree_contains_struct[CONST_DECL][TS_DECL_WRTL] = 1;
307 tree_contains_struct[VAR_DECL][TS_DECL_WRTL] = 1;
308 tree_contains_struct[PARM_DECL][TS_DECL_WRTL] = 1;
309 tree_contains_struct[RESULT_DECL][TS_DECL_WRTL] = 1;
310 tree_contains_struct[FUNCTION_DECL][TS_DECL_WRTL] = 1;
311 tree_contains_struct[LABEL_DECL][TS_DECL_WRTL] = 1;
313 tree_contains_struct[CONST_DECL][TS_DECL_MINIMAL] = 1;
314 tree_contains_struct[VAR_DECL][TS_DECL_MINIMAL] = 1;
315 tree_contains_struct[PARM_DECL][TS_DECL_MINIMAL] = 1;
316 tree_contains_struct[RESULT_DECL][TS_DECL_MINIMAL] = 1;
317 tree_contains_struct[FUNCTION_DECL][TS_DECL_MINIMAL] = 1;
318 tree_contains_struct[TYPE_DECL][TS_DECL_MINIMAL] = 1;
319 tree_contains_struct[TRANSLATION_UNIT_DECL][TS_DECL_MINIMAL] = 1;
320 tree_contains_struct[LABEL_DECL][TS_DECL_MINIMAL] = 1;
321 tree_contains_struct[FIELD_DECL][TS_DECL_MINIMAL] = 1;
323 tree_contains_struct[VAR_DECL][TS_DECL_WITH_VIS] = 1;
324 tree_contains_struct[FUNCTION_DECL][TS_DECL_WITH_VIS] = 1;
325 tree_contains_struct[TYPE_DECL][TS_DECL_WITH_VIS] = 1;
326 tree_contains_struct[TRANSLATION_UNIT_DECL][TS_DECL_WITH_VIS] = 1;
328 tree_contains_struct[VAR_DECL][TS_VAR_DECL] = 1;
329 tree_contains_struct[FIELD_DECL][TS_FIELD_DECL] = 1;
330 tree_contains_struct[PARM_DECL][TS_PARM_DECL] = 1;
331 tree_contains_struct[LABEL_DECL][TS_LABEL_DECL] = 1;
332 tree_contains_struct[RESULT_DECL][TS_RESULT_DECL] = 1;
333 tree_contains_struct[CONST_DECL][TS_CONST_DECL] = 1;
334 tree_contains_struct[TYPE_DECL][TS_TYPE_DECL] = 1;
335 tree_contains_struct[FUNCTION_DECL][TS_FUNCTION_DECL] = 1;
336 tree_contains_struct[IMPORTED_DECL][TS_DECL_MINIMAL] = 1;
337 tree_contains_struct[IMPORTED_DECL][TS_DECL_COMMON] = 1;
339 lang_hooks.init_ts ();
343 /* The name of the object as the assembler will see it (but before any
344 translations made by ASM_OUTPUT_LABELREF). Often this is the same
345 as DECL_NAME. It is an IDENTIFIER_NODE. */
347 decl_assembler_name (tree decl)
349 if (!DECL_ASSEMBLER_NAME_SET_P (decl))
350 lang_hooks.set_decl_assembler_name (decl);
351 return DECL_WITH_VIS_CHECK (decl)->decl_with_vis.assembler_name;
354 /* Compare ASMNAME with the DECL_ASSEMBLER_NAME of DECL. */
357 decl_assembler_name_equal (tree decl, const_tree asmname)
359 tree decl_asmname = DECL_ASSEMBLER_NAME (decl);
360 const char *decl_str;
361 const char *asmname_str;
364 if (decl_asmname == asmname)
367 decl_str = IDENTIFIER_POINTER (decl_asmname);
368 asmname_str = IDENTIFIER_POINTER (asmname);
371 /* If the target assembler name was set by the user, things are trickier.
372 We have a leading '*' to begin with. After that, it's arguable what
373 is the correct thing to do with -fleading-underscore. Arguably, we've
374 historically been doing the wrong thing in assemble_alias by always
375 printing the leading underscore. Since we're not changing that, make
376 sure user_label_prefix follows the '*' before matching. */
377 if (decl_str[0] == '*')
379 size_t ulp_len = strlen (user_label_prefix);
385 else if (strncmp (decl_str, user_label_prefix, ulp_len) == 0)
386 decl_str += ulp_len, test=true;
390 if (asmname_str[0] == '*')
392 size_t ulp_len = strlen (user_label_prefix);
398 else if (strncmp (asmname_str, user_label_prefix, ulp_len) == 0)
399 asmname_str += ulp_len, test=true;
406 return strcmp (decl_str, asmname_str) == 0;
409 /* Hash asmnames ignoring the user specified marks. */
412 decl_assembler_name_hash (const_tree asmname)
414 if (IDENTIFIER_POINTER (asmname)[0] == '*')
416 const char *decl_str = IDENTIFIER_POINTER (asmname) + 1;
417 size_t ulp_len = strlen (user_label_prefix);
421 else if (strncmp (decl_str, user_label_prefix, ulp_len) == 0)
424 return htab_hash_string (decl_str);
427 return htab_hash_string (IDENTIFIER_POINTER (asmname));
430 /* Compute the number of bytes occupied by a tree with code CODE.
431 This function cannot be used for nodes that have variable sizes,
432 including TREE_VEC, STRING_CST, and CALL_EXPR. */
434 tree_code_size (enum tree_code code)
436 switch (TREE_CODE_CLASS (code))
438 case tcc_declaration: /* A decl node */
443 return sizeof (struct tree_field_decl);
445 return sizeof (struct tree_parm_decl);
447 return sizeof (struct tree_var_decl);
449 return sizeof (struct tree_label_decl);
451 return sizeof (struct tree_result_decl);
453 return sizeof (struct tree_const_decl);
455 return sizeof (struct tree_type_decl);
457 return sizeof (struct tree_function_decl);
459 return sizeof (struct tree_decl_non_common);
463 case tcc_type: /* a type node */
464 return sizeof (struct tree_type);
466 case tcc_reference: /* a reference */
467 case tcc_expression: /* an expression */
468 case tcc_statement: /* an expression with side effects */
469 case tcc_comparison: /* a comparison expression */
470 case tcc_unary: /* a unary arithmetic expression */
471 case tcc_binary: /* a binary arithmetic expression */
472 return (sizeof (struct tree_exp)
473 + (TREE_CODE_LENGTH (code) - 1) * sizeof (tree));
475 case tcc_constant: /* a constant */
478 case INTEGER_CST: return sizeof (struct tree_int_cst);
479 case REAL_CST: return sizeof (struct tree_real_cst);
480 case FIXED_CST: return sizeof (struct tree_fixed_cst);
481 case COMPLEX_CST: return sizeof (struct tree_complex);
482 case VECTOR_CST: return sizeof (struct tree_vector);
483 case STRING_CST: gcc_unreachable ();
485 return lang_hooks.tree_size (code);
488 case tcc_exceptional: /* something random, like an identifier. */
491 case IDENTIFIER_NODE: return lang_hooks.identifier_size;
492 case TREE_LIST: return sizeof (struct tree_list);
495 case PLACEHOLDER_EXPR: return sizeof (struct tree_common);
498 case OMP_CLAUSE: gcc_unreachable ();
500 case SSA_NAME: return sizeof (struct tree_ssa_name);
502 case STATEMENT_LIST: return sizeof (struct tree_statement_list);
503 case BLOCK: return sizeof (struct tree_block);
504 case CONSTRUCTOR: return sizeof (struct tree_constructor);
505 case OPTIMIZATION_NODE: return sizeof (struct tree_optimization_option);
506 case TARGET_OPTION_NODE: return sizeof (struct tree_target_option);
509 return lang_hooks.tree_size (code);
517 /* Compute the number of bytes occupied by NODE. This routine only
518 looks at TREE_CODE, except for those nodes that have variable sizes. */
520 tree_size (const_tree node)
522 const enum tree_code code = TREE_CODE (node);
526 return (offsetof (struct tree_binfo, base_binfos)
527 + VEC_embedded_size (tree, BINFO_N_BASE_BINFOS (node)));
530 return (sizeof (struct tree_vec)
531 + (TREE_VEC_LENGTH (node) - 1) * sizeof (tree));
534 return TREE_STRING_LENGTH (node) + offsetof (struct tree_string, str) + 1;
537 return (sizeof (struct tree_omp_clause)
538 + (omp_clause_num_ops[OMP_CLAUSE_CODE (node)] - 1)
542 if (TREE_CODE_CLASS (code) == tcc_vl_exp)
543 return (sizeof (struct tree_exp)
544 + (VL_EXP_OPERAND_LENGTH (node) - 1) * sizeof (tree));
546 return tree_code_size (code);
550 /* Return a newly allocated node of code CODE. For decl and type
551 nodes, some other fields are initialized. The rest of the node is
552 initialized to zero. This function cannot be used for TREE_VEC or
553 OMP_CLAUSE nodes, which is enforced by asserts in tree_code_size.
555 Achoo! I got a code in the node. */
558 make_node_stat (enum tree_code code MEM_STAT_DECL)
561 enum tree_code_class type = TREE_CODE_CLASS (code);
562 size_t length = tree_code_size (code);
563 #ifdef GATHER_STATISTICS
568 case tcc_declaration: /* A decl node */
572 case tcc_type: /* a type node */
576 case tcc_statement: /* an expression with side effects */
580 case tcc_reference: /* a reference */
584 case tcc_expression: /* an expression */
585 case tcc_comparison: /* a comparison expression */
586 case tcc_unary: /* a unary arithmetic expression */
587 case tcc_binary: /* a binary arithmetic expression */
591 case tcc_constant: /* a constant */
595 case tcc_exceptional: /* something random, like an identifier. */
598 case IDENTIFIER_NODE:
611 kind = ssa_name_kind;
632 tree_node_counts[(int) kind]++;
633 tree_node_sizes[(int) kind] += length;
636 if (code == IDENTIFIER_NODE)
637 t = (tree) ggc_alloc_zone_pass_stat (length, &tree_id_zone);
639 t = (tree) ggc_alloc_zone_pass_stat (length, &tree_zone);
641 memset (t, 0, length);
643 TREE_SET_CODE (t, code);
648 TREE_SIDE_EFFECTS (t) = 1;
651 case tcc_declaration:
652 if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
654 if (code == FUNCTION_DECL)
656 DECL_ALIGN (t) = FUNCTION_BOUNDARY;
657 DECL_MODE (t) = FUNCTION_MODE;
661 /* We have not yet computed the alias set for this declaration. */
662 DECL_POINTER_ALIAS_SET (t) = -1;
664 DECL_SOURCE_LOCATION (t) = input_location;
665 DECL_UID (t) = next_decl_uid++;
670 TYPE_UID (t) = next_type_uid++;
671 TYPE_ALIGN (t) = BITS_PER_UNIT;
672 TYPE_USER_ALIGN (t) = 0;
673 TYPE_MAIN_VARIANT (t) = t;
674 TYPE_CANONICAL (t) = t;
676 /* Default to no attributes for type, but let target change that. */
677 TYPE_ATTRIBUTES (t) = NULL_TREE;
678 targetm.set_default_type_attributes (t);
680 /* We have not yet computed the alias set for this type. */
681 TYPE_ALIAS_SET (t) = -1;
685 TREE_CONSTANT (t) = 1;
694 case PREDECREMENT_EXPR:
695 case PREINCREMENT_EXPR:
696 case POSTDECREMENT_EXPR:
697 case POSTINCREMENT_EXPR:
698 /* All of these have side-effects, no matter what their
700 TREE_SIDE_EFFECTS (t) = 1;
709 /* Other classes need no special treatment. */
716 /* Return a new node with the same contents as NODE except that its
717 TREE_CHAIN is zero and it has a fresh uid. */
720 copy_node_stat (tree node MEM_STAT_DECL)
723 enum tree_code code = TREE_CODE (node);
726 gcc_assert (code != STATEMENT_LIST);
728 length = tree_size (node);
729 t = (tree) ggc_alloc_zone_pass_stat (length, &tree_zone);
730 memcpy (t, node, length);
733 TREE_ASM_WRITTEN (t) = 0;
734 TREE_VISITED (t) = 0;
737 if (TREE_CODE_CLASS (code) == tcc_declaration)
739 DECL_UID (t) = next_decl_uid++;
740 if ((TREE_CODE (node) == PARM_DECL || TREE_CODE (node) == VAR_DECL)
741 && DECL_HAS_VALUE_EXPR_P (node))
743 SET_DECL_VALUE_EXPR (t, DECL_VALUE_EXPR (node));
744 DECL_HAS_VALUE_EXPR_P (t) = 1;
746 if (TREE_CODE (node) == VAR_DECL && DECL_HAS_INIT_PRIORITY_P (node))
748 SET_DECL_INIT_PRIORITY (t, DECL_INIT_PRIORITY (node));
749 DECL_HAS_INIT_PRIORITY_P (t) = 1;
751 if (TREE_CODE (node) == VAR_DECL && DECL_BASED_ON_RESTRICT_P (node))
753 SET_DECL_RESTRICT_BASE (t, DECL_GET_RESTRICT_BASE (node));
754 DECL_BASED_ON_RESTRICT_P (t) = 1;
757 else if (TREE_CODE_CLASS (code) == tcc_type)
759 TYPE_UID (t) = next_type_uid++;
760 /* The following is so that the debug code for
761 the copy is different from the original type.
762 The two statements usually duplicate each other
763 (because they clear fields of the same union),
764 but the optimizer should catch that. */
765 TYPE_SYMTAB_POINTER (t) = 0;
766 TYPE_SYMTAB_ADDRESS (t) = 0;
768 /* Do not copy the values cache. */
769 if (TYPE_CACHED_VALUES_P(t))
771 TYPE_CACHED_VALUES_P (t) = 0;
772 TYPE_CACHED_VALUES (t) = NULL_TREE;
779 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
780 For example, this can copy a list made of TREE_LIST nodes. */
783 copy_list (tree list)
791 head = prev = copy_node (list);
792 next = TREE_CHAIN (list);
795 TREE_CHAIN (prev) = copy_node (next);
796 prev = TREE_CHAIN (prev);
797 next = TREE_CHAIN (next);
803 /* Create an INT_CST node with a LOW value sign extended. */
806 build_int_cst (tree type, HOST_WIDE_INT low)
808 /* Support legacy code. */
810 type = integer_type_node;
812 return build_int_cst_wide (type, low, low < 0 ? -1 : 0);
815 /* Create an INT_CST node with a LOW value zero extended. */
818 build_int_cstu (tree type, unsigned HOST_WIDE_INT low)
820 return build_int_cst_wide (type, low, 0);
823 /* Create an INT_CST node with a LOW value in TYPE. The value is sign extended
824 if it is negative. This function is similar to build_int_cst, but
825 the extra bits outside of the type precision are cleared. Constants
826 with these extra bits may confuse the fold so that it detects overflows
827 even in cases when they do not occur, and in general should be avoided.
828 We cannot however make this a default behavior of build_int_cst without
829 more intrusive changes, since there are parts of gcc that rely on the extra
830 precision of the integer constants. */
833 build_int_cst_type (tree type, HOST_WIDE_INT low)
835 unsigned HOST_WIDE_INT low1;
840 fit_double_type (low, low < 0 ? -1 : 0, &low1, &hi, type);
842 return build_int_cst_wide (type, low1, hi);
845 /* Create an INT_CST node of TYPE and value HI:LOW. The value is truncated
846 and sign extended according to the value range of TYPE. */
849 build_int_cst_wide_type (tree type,
850 unsigned HOST_WIDE_INT low, HOST_WIDE_INT high)
852 fit_double_type (low, high, &low, &high, type);
853 return build_int_cst_wide (type, low, high);
856 /* These are the hash table functions for the hash table of INTEGER_CST
857 nodes of a sizetype. */
859 /* Return the hash code code X, an INTEGER_CST. */
862 int_cst_hash_hash (const void *x)
864 const_tree const t = (const_tree) x;
866 return (TREE_INT_CST_HIGH (t) ^ TREE_INT_CST_LOW (t)
867 ^ htab_hash_pointer (TREE_TYPE (t)));
870 /* Return nonzero if the value represented by *X (an INTEGER_CST tree node)
871 is the same as that given by *Y, which is the same. */
874 int_cst_hash_eq (const void *x, const void *y)
876 const_tree const xt = (const_tree) x;
877 const_tree const yt = (const_tree) y;
879 return (TREE_TYPE (xt) == TREE_TYPE (yt)
880 && TREE_INT_CST_HIGH (xt) == TREE_INT_CST_HIGH (yt)
881 && TREE_INT_CST_LOW (xt) == TREE_INT_CST_LOW (yt));
884 /* Create an INT_CST node of TYPE and value HI:LOW.
885 The returned node is always shared. For small integers we use a
886 per-type vector cache, for larger ones we use a single hash table. */
889 build_int_cst_wide (tree type, unsigned HOST_WIDE_INT low, HOST_WIDE_INT hi)
897 switch (TREE_CODE (type))
901 /* Cache NULL pointer. */
910 /* Cache false or true. */
918 if (TYPE_UNSIGNED (type))
921 limit = INTEGER_SHARE_LIMIT;
922 if (!hi && low < (unsigned HOST_WIDE_INT)INTEGER_SHARE_LIMIT)
928 limit = INTEGER_SHARE_LIMIT + 1;
929 if (!hi && low < (unsigned HOST_WIDE_INT)INTEGER_SHARE_LIMIT)
931 else if (hi == -1 && low == -(unsigned HOST_WIDE_INT)1)
945 /* Look for it in the type's vector of small shared ints. */
946 if (!TYPE_CACHED_VALUES_P (type))
948 TYPE_CACHED_VALUES_P (type) = 1;
949 TYPE_CACHED_VALUES (type) = make_tree_vec (limit);
952 t = TREE_VEC_ELT (TYPE_CACHED_VALUES (type), ix);
955 /* Make sure no one is clobbering the shared constant. */
956 gcc_assert (TREE_TYPE (t) == type);
957 gcc_assert (TREE_INT_CST_LOW (t) == low);
958 gcc_assert (TREE_INT_CST_HIGH (t) == hi);
962 /* Create a new shared int. */
963 t = make_node (INTEGER_CST);
965 TREE_INT_CST_LOW (t) = low;
966 TREE_INT_CST_HIGH (t) = hi;
967 TREE_TYPE (t) = type;
969 TREE_VEC_ELT (TYPE_CACHED_VALUES (type), ix) = t;
974 /* Use the cache of larger shared ints. */
977 TREE_INT_CST_LOW (int_cst_node) = low;
978 TREE_INT_CST_HIGH (int_cst_node) = hi;
979 TREE_TYPE (int_cst_node) = type;
981 slot = htab_find_slot (int_cst_hash_table, int_cst_node, INSERT);
985 /* Insert this one into the hash table. */
988 /* Make a new node for next time round. */
989 int_cst_node = make_node (INTEGER_CST);
996 /* Builds an integer constant in TYPE such that lowest BITS bits are ones
997 and the rest are zeros. */
1000 build_low_bits_mask (tree type, unsigned bits)
1002 unsigned HOST_WIDE_INT low;
1004 unsigned HOST_WIDE_INT all_ones = ~(unsigned HOST_WIDE_INT) 0;
1006 gcc_assert (bits <= TYPE_PRECISION (type));
1008 if (bits == TYPE_PRECISION (type)
1009 && !TYPE_UNSIGNED (type))
1011 /* Sign extended all-ones mask. */
1015 else if (bits <= HOST_BITS_PER_WIDE_INT)
1017 low = all_ones >> (HOST_BITS_PER_WIDE_INT - bits);
1022 bits -= HOST_BITS_PER_WIDE_INT;
1024 high = all_ones >> (HOST_BITS_PER_WIDE_INT - bits);
1027 return build_int_cst_wide (type, low, high);
1030 /* Checks that X is integer constant that can be expressed in (unsigned)
1031 HOST_WIDE_INT without loss of precision. */
1034 cst_and_fits_in_hwi (const_tree x)
1036 if (TREE_CODE (x) != INTEGER_CST)
1039 if (TYPE_PRECISION (TREE_TYPE (x)) > HOST_BITS_PER_WIDE_INT)
1042 return (TREE_INT_CST_HIGH (x) == 0
1043 || TREE_INT_CST_HIGH (x) == -1);
1046 /* Return a new VECTOR_CST node whose type is TYPE and whose values
1047 are in a list pointed to by VALS. */
1050 build_vector (tree type, tree vals)
1052 tree v = make_node (VECTOR_CST);
1056 TREE_VECTOR_CST_ELTS (v) = vals;
1057 TREE_TYPE (v) = type;
1059 /* Iterate through elements and check for overflow. */
1060 for (link = vals; link; link = TREE_CHAIN (link))
1062 tree value = TREE_VALUE (link);
1064 /* Don't crash if we get an address constant. */
1065 if (!CONSTANT_CLASS_P (value))
1068 over |= TREE_OVERFLOW (value);
1071 TREE_OVERFLOW (v) = over;
1075 /* Return a new VECTOR_CST node whose type is TYPE and whose values
1076 are extracted from V, a vector of CONSTRUCTOR_ELT. */
1079 build_vector_from_ctor (tree type, VEC(constructor_elt,gc) *v)
1081 tree list = NULL_TREE;
1082 unsigned HOST_WIDE_INT idx;
1085 FOR_EACH_CONSTRUCTOR_VALUE (v, idx, value)
1086 list = tree_cons (NULL_TREE, value, list);
1087 return build_vector (type, nreverse (list));
1090 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
1091 are in the VEC pointed to by VALS. */
1093 build_constructor (tree type, VEC(constructor_elt,gc) *vals)
1095 tree c = make_node (CONSTRUCTOR);
1096 TREE_TYPE (c) = type;
1097 CONSTRUCTOR_ELTS (c) = vals;
1101 /* Build a CONSTRUCTOR node made of a single initializer, with the specified
1104 build_constructor_single (tree type, tree index, tree value)
1106 VEC(constructor_elt,gc) *v;
1107 constructor_elt *elt;
1110 v = VEC_alloc (constructor_elt, gc, 1);
1111 elt = VEC_quick_push (constructor_elt, v, NULL);
1115 t = build_constructor (type, v);
1116 TREE_CONSTANT (t) = TREE_CONSTANT (value);
1121 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
1122 are in a list pointed to by VALS. */
1124 build_constructor_from_list (tree type, tree vals)
1127 VEC(constructor_elt,gc) *v = NULL;
1128 bool constant_p = true;
1132 v = VEC_alloc (constructor_elt, gc, list_length (vals));
1133 for (t = vals; t; t = TREE_CHAIN (t))
1135 constructor_elt *elt = VEC_quick_push (constructor_elt, v, NULL);
1136 val = TREE_VALUE (t);
1137 elt->index = TREE_PURPOSE (t);
1139 if (!TREE_CONSTANT (val))
1144 t = build_constructor (type, v);
1145 TREE_CONSTANT (t) = constant_p;
1149 /* Return a new FIXED_CST node whose type is TYPE and value is F. */
1152 build_fixed (tree type, FIXED_VALUE_TYPE f)
1155 FIXED_VALUE_TYPE *fp;
1157 v = make_node (FIXED_CST);
1158 fp = GGC_NEW (FIXED_VALUE_TYPE);
1159 memcpy (fp, &f, sizeof (FIXED_VALUE_TYPE));
1161 TREE_TYPE (v) = type;
1162 TREE_FIXED_CST_PTR (v) = fp;
1166 /* Return a new REAL_CST node whose type is TYPE and value is D. */
1169 build_real (tree type, REAL_VALUE_TYPE d)
1172 REAL_VALUE_TYPE *dp;
1175 /* ??? Used to check for overflow here via CHECK_FLOAT_TYPE.
1176 Consider doing it via real_convert now. */
1178 v = make_node (REAL_CST);
1179 dp = GGC_NEW (REAL_VALUE_TYPE);
1180 memcpy (dp, &d, sizeof (REAL_VALUE_TYPE));
1182 TREE_TYPE (v) = type;
1183 TREE_REAL_CST_PTR (v) = dp;
1184 TREE_OVERFLOW (v) = overflow;
1188 /* Return a new REAL_CST node whose type is TYPE
1189 and whose value is the integer value of the INTEGER_CST node I. */
1192 real_value_from_int_cst (const_tree type, const_tree i)
1196 /* Clear all bits of the real value type so that we can later do
1197 bitwise comparisons to see if two values are the same. */
1198 memset (&d, 0, sizeof d);
1200 real_from_integer (&d, type ? TYPE_MODE (type) : VOIDmode,
1201 TREE_INT_CST_LOW (i), TREE_INT_CST_HIGH (i),
1202 TYPE_UNSIGNED (TREE_TYPE (i)));
1206 /* Given a tree representing an integer constant I, return a tree
1207 representing the same value as a floating-point constant of type TYPE. */
1210 build_real_from_int_cst (tree type, const_tree i)
1213 int overflow = TREE_OVERFLOW (i);
1215 v = build_real (type, real_value_from_int_cst (type, i));
1217 TREE_OVERFLOW (v) |= overflow;
1221 /* Return a newly constructed STRING_CST node whose value is
1222 the LEN characters at STR.
1223 The TREE_TYPE is not initialized. */
1226 build_string (int len, const char *str)
1231 /* Do not waste bytes provided by padding of struct tree_string. */
1232 length = len + offsetof (struct tree_string, str) + 1;
1234 #ifdef GATHER_STATISTICS
1235 tree_node_counts[(int) c_kind]++;
1236 tree_node_sizes[(int) c_kind] += length;
1239 s = ggc_alloc_tree (length);
1241 memset (s, 0, sizeof (struct tree_common));
1242 TREE_SET_CODE (s, STRING_CST);
1243 TREE_CONSTANT (s) = 1;
1244 TREE_STRING_LENGTH (s) = len;
1245 memcpy (s->string.str, str, len);
1246 s->string.str[len] = '\0';
1251 /* Return a newly constructed COMPLEX_CST node whose value is
1252 specified by the real and imaginary parts REAL and IMAG.
1253 Both REAL and IMAG should be constant nodes. TYPE, if specified,
1254 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
1257 build_complex (tree type, tree real, tree imag)
1259 tree t = make_node (COMPLEX_CST);
1261 TREE_REALPART (t) = real;
1262 TREE_IMAGPART (t) = imag;
1263 TREE_TYPE (t) = type ? type : build_complex_type (TREE_TYPE (real));
1264 TREE_OVERFLOW (t) = TREE_OVERFLOW (real) | TREE_OVERFLOW (imag);
1268 /* Return a constant of arithmetic type TYPE which is the
1269 multiplicative identity of the set TYPE. */
1272 build_one_cst (tree type)
1274 switch (TREE_CODE (type))
1276 case INTEGER_TYPE: case ENUMERAL_TYPE: case BOOLEAN_TYPE:
1277 case POINTER_TYPE: case REFERENCE_TYPE:
1279 return build_int_cst (type, 1);
1282 return build_real (type, dconst1);
1284 case FIXED_POINT_TYPE:
1285 /* We can only generate 1 for accum types. */
1286 gcc_assert (ALL_SCALAR_ACCUM_MODE_P (TYPE_MODE (type)));
1287 return build_fixed (type, FCONST1(TYPE_MODE (type)));
1294 scalar = build_one_cst (TREE_TYPE (type));
1296 /* Create 'vect_cst_ = {cst,cst,...,cst}' */
1298 for (i = TYPE_VECTOR_SUBPARTS (type); --i >= 0; )
1299 cst = tree_cons (NULL_TREE, scalar, cst);
1301 return build_vector (type, cst);
1305 return build_complex (type,
1306 build_one_cst (TREE_TYPE (type)),
1307 fold_convert (TREE_TYPE (type), integer_zero_node));
1314 /* Build a BINFO with LEN language slots. */
1317 make_tree_binfo_stat (unsigned base_binfos MEM_STAT_DECL)
1320 size_t length = (offsetof (struct tree_binfo, base_binfos)
1321 + VEC_embedded_size (tree, base_binfos));
1323 #ifdef GATHER_STATISTICS
1324 tree_node_counts[(int) binfo_kind]++;
1325 tree_node_sizes[(int) binfo_kind] += length;
1328 t = (tree) ggc_alloc_zone_pass_stat (length, &tree_zone);
1330 memset (t, 0, offsetof (struct tree_binfo, base_binfos));
1332 TREE_SET_CODE (t, TREE_BINFO);
1334 VEC_embedded_init (tree, BINFO_BASE_BINFOS (t), base_binfos);
1340 /* Build a newly constructed TREE_VEC node of length LEN. */
1343 make_tree_vec_stat (int len MEM_STAT_DECL)
1346 int length = (len - 1) * sizeof (tree) + sizeof (struct tree_vec);
1348 #ifdef GATHER_STATISTICS
1349 tree_node_counts[(int) vec_kind]++;
1350 tree_node_sizes[(int) vec_kind] += length;
1353 t = (tree) ggc_alloc_zone_pass_stat (length, &tree_zone);
1355 memset (t, 0, length);
1357 TREE_SET_CODE (t, TREE_VEC);
1358 TREE_VEC_LENGTH (t) = len;
1363 /* Return 1 if EXPR is the integer constant zero or a complex constant
1367 integer_zerop (const_tree expr)
1371 return ((TREE_CODE (expr) == INTEGER_CST
1372 && TREE_INT_CST_LOW (expr) == 0
1373 && TREE_INT_CST_HIGH (expr) == 0)
1374 || (TREE_CODE (expr) == COMPLEX_CST
1375 && integer_zerop (TREE_REALPART (expr))
1376 && integer_zerop (TREE_IMAGPART (expr))));
1379 /* Return 1 if EXPR is the integer constant one or the corresponding
1380 complex constant. */
1383 integer_onep (const_tree expr)
1387 return ((TREE_CODE (expr) == INTEGER_CST
1388 && TREE_INT_CST_LOW (expr) == 1
1389 && TREE_INT_CST_HIGH (expr) == 0)
1390 || (TREE_CODE (expr) == COMPLEX_CST
1391 && integer_onep (TREE_REALPART (expr))
1392 && integer_zerop (TREE_IMAGPART (expr))));
1395 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
1396 it contains. Likewise for the corresponding complex constant. */
1399 integer_all_onesp (const_tree expr)
1406 if (TREE_CODE (expr) == COMPLEX_CST
1407 && integer_all_onesp (TREE_REALPART (expr))
1408 && integer_zerop (TREE_IMAGPART (expr)))
1411 else if (TREE_CODE (expr) != INTEGER_CST)
1414 uns = TYPE_UNSIGNED (TREE_TYPE (expr));
1415 if (TREE_INT_CST_LOW (expr) == ~(unsigned HOST_WIDE_INT) 0
1416 && TREE_INT_CST_HIGH (expr) == -1)
1421 /* Note that using TYPE_PRECISION here is wrong. We care about the
1422 actual bits, not the (arbitrary) range of the type. */
1423 prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr)));
1424 if (prec >= HOST_BITS_PER_WIDE_INT)
1426 HOST_WIDE_INT high_value;
1429 shift_amount = prec - HOST_BITS_PER_WIDE_INT;
1431 /* Can not handle precisions greater than twice the host int size. */
1432 gcc_assert (shift_amount <= HOST_BITS_PER_WIDE_INT);
1433 if (shift_amount == HOST_BITS_PER_WIDE_INT)
1434 /* Shifting by the host word size is undefined according to the ANSI
1435 standard, so we must handle this as a special case. */
1438 high_value = ((HOST_WIDE_INT) 1 << shift_amount) - 1;
1440 return (TREE_INT_CST_LOW (expr) == ~(unsigned HOST_WIDE_INT) 0
1441 && TREE_INT_CST_HIGH (expr) == high_value);
1444 return TREE_INT_CST_LOW (expr) == ((unsigned HOST_WIDE_INT) 1 << prec) - 1;
1447 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
1451 integer_pow2p (const_tree expr)
1454 HOST_WIDE_INT high, low;
1458 if (TREE_CODE (expr) == COMPLEX_CST
1459 && integer_pow2p (TREE_REALPART (expr))
1460 && integer_zerop (TREE_IMAGPART (expr)))
1463 if (TREE_CODE (expr) != INTEGER_CST)
1466 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
1467 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
1468 high = TREE_INT_CST_HIGH (expr);
1469 low = TREE_INT_CST_LOW (expr);
1471 /* First clear all bits that are beyond the type's precision in case
1472 we've been sign extended. */
1474 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
1476 else if (prec > HOST_BITS_PER_WIDE_INT)
1477 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
1481 if (prec < HOST_BITS_PER_WIDE_INT)
1482 low &= ~((HOST_WIDE_INT) (-1) << prec);
1485 if (high == 0 && low == 0)
1488 return ((high == 0 && (low & (low - 1)) == 0)
1489 || (low == 0 && (high & (high - 1)) == 0));
1492 /* Return 1 if EXPR is an integer constant other than zero or a
1493 complex constant other than zero. */
1496 integer_nonzerop (const_tree expr)
1500 return ((TREE_CODE (expr) == INTEGER_CST
1501 && (TREE_INT_CST_LOW (expr) != 0
1502 || TREE_INT_CST_HIGH (expr) != 0))
1503 || (TREE_CODE (expr) == COMPLEX_CST
1504 && (integer_nonzerop (TREE_REALPART (expr))
1505 || integer_nonzerop (TREE_IMAGPART (expr)))));
1508 /* Return 1 if EXPR is the fixed-point constant zero. */
1511 fixed_zerop (const_tree expr)
1513 return (TREE_CODE (expr) == FIXED_CST
1514 && double_int_zero_p (TREE_FIXED_CST (expr).data));
1517 /* Return the power of two represented by a tree node known to be a
1521 tree_log2 (const_tree expr)
1524 HOST_WIDE_INT high, low;
1528 if (TREE_CODE (expr) == COMPLEX_CST)
1529 return tree_log2 (TREE_REALPART (expr));
1531 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
1532 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
1534 high = TREE_INT_CST_HIGH (expr);
1535 low = TREE_INT_CST_LOW (expr);
1537 /* First clear all bits that are beyond the type's precision in case
1538 we've been sign extended. */
1540 if (prec == 2 * HOST_BITS_PER_WIDE_INT)
1542 else if (prec > HOST_BITS_PER_WIDE_INT)
1543 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
1547 if (prec < HOST_BITS_PER_WIDE_INT)
1548 low &= ~((HOST_WIDE_INT) (-1) << prec);
1551 return (high != 0 ? HOST_BITS_PER_WIDE_INT + exact_log2 (high)
1552 : exact_log2 (low));
1555 /* Similar, but return the largest integer Y such that 2 ** Y is less
1556 than or equal to EXPR. */
1559 tree_floor_log2 (const_tree expr)
1562 HOST_WIDE_INT high, low;
1566 if (TREE_CODE (expr) == COMPLEX_CST)
1567 return tree_log2 (TREE_REALPART (expr));
1569 prec = (POINTER_TYPE_P (TREE_TYPE (expr))
1570 ? POINTER_SIZE : TYPE_PRECISION (TREE_TYPE (expr)));
1572 high = TREE_INT_CST_HIGH (expr);
1573 low = TREE_INT_CST_LOW (expr);
1575 /* First clear all bits that are beyond the type's precision in case
1576 we've been sign extended. Ignore if type's precision hasn't been set
1577 since what we are doing is setting it. */
1579 if (prec == 2 * HOST_BITS_PER_WIDE_INT || prec == 0)
1581 else if (prec > HOST_BITS_PER_WIDE_INT)
1582 high &= ~((HOST_WIDE_INT) (-1) << (prec - HOST_BITS_PER_WIDE_INT));
1586 if (prec < HOST_BITS_PER_WIDE_INT)
1587 low &= ~((HOST_WIDE_INT) (-1) << prec);
1590 return (high != 0 ? HOST_BITS_PER_WIDE_INT + floor_log2 (high)
1591 : floor_log2 (low));
1594 /* Return 1 if EXPR is the real constant zero. */
1597 real_zerop (const_tree expr)
1601 return ((TREE_CODE (expr) == REAL_CST
1602 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst0))
1603 || (TREE_CODE (expr) == COMPLEX_CST
1604 && real_zerop (TREE_REALPART (expr))
1605 && real_zerop (TREE_IMAGPART (expr))));
1608 /* Return 1 if EXPR is the real constant one in real or complex form. */
1611 real_onep (const_tree expr)
1615 return ((TREE_CODE (expr) == REAL_CST
1616 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst1))
1617 || (TREE_CODE (expr) == COMPLEX_CST
1618 && real_onep (TREE_REALPART (expr))
1619 && real_zerop (TREE_IMAGPART (expr))));
1622 /* Return 1 if EXPR is the real constant two. */
1625 real_twop (const_tree expr)
1629 return ((TREE_CODE (expr) == REAL_CST
1630 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconst2))
1631 || (TREE_CODE (expr) == COMPLEX_CST
1632 && real_twop (TREE_REALPART (expr))
1633 && real_zerop (TREE_IMAGPART (expr))));
1636 /* Return 1 if EXPR is the real constant minus one. */
1639 real_minus_onep (const_tree expr)
1643 return ((TREE_CODE (expr) == REAL_CST
1644 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr), dconstm1))
1645 || (TREE_CODE (expr) == COMPLEX_CST
1646 && real_minus_onep (TREE_REALPART (expr))
1647 && real_zerop (TREE_IMAGPART (expr))));
1650 /* Nonzero if EXP is a constant or a cast of a constant. */
1653 really_constant_p (const_tree exp)
1655 /* This is not quite the same as STRIP_NOPS. It does more. */
1656 while (CONVERT_EXPR_P (exp)
1657 || TREE_CODE (exp) == NON_LVALUE_EXPR)
1658 exp = TREE_OPERAND (exp, 0);
1659 return TREE_CONSTANT (exp);
1662 /* Return first list element whose TREE_VALUE is ELEM.
1663 Return 0 if ELEM is not in LIST. */
1666 value_member (tree elem, tree list)
1670 if (elem == TREE_VALUE (list))
1672 list = TREE_CHAIN (list);
1677 /* Return first list element whose TREE_PURPOSE is ELEM.
1678 Return 0 if ELEM is not in LIST. */
1681 purpose_member (const_tree elem, tree list)
1685 if (elem == TREE_PURPOSE (list))
1687 list = TREE_CHAIN (list);
1692 /* Return nonzero if ELEM is part of the chain CHAIN. */
1695 chain_member (const_tree elem, const_tree chain)
1701 chain = TREE_CHAIN (chain);
1707 /* Return the length of a chain of nodes chained through TREE_CHAIN.
1708 We expect a null pointer to mark the end of the chain.
1709 This is the Lisp primitive `length'. */
1712 list_length (const_tree t)
1715 #ifdef ENABLE_TREE_CHECKING
1723 #ifdef ENABLE_TREE_CHECKING
1726 gcc_assert (p != q);
1734 /* Returns the number of FIELD_DECLs in TYPE. */
1737 fields_length (const_tree type)
1739 tree t = TYPE_FIELDS (type);
1742 for (; t; t = TREE_CHAIN (t))
1743 if (TREE_CODE (t) == FIELD_DECL)
1749 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
1750 by modifying the last node in chain 1 to point to chain 2.
1751 This is the Lisp primitive `nconc'. */
1754 chainon (tree op1, tree op2)
1763 for (t1 = op1; TREE_CHAIN (t1); t1 = TREE_CHAIN (t1))
1765 TREE_CHAIN (t1) = op2;
1767 #ifdef ENABLE_TREE_CHECKING
1770 for (t2 = op2; t2; t2 = TREE_CHAIN (t2))
1771 gcc_assert (t2 != t1);
1778 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
1781 tree_last (tree chain)
1785 while ((next = TREE_CHAIN (chain)))
1790 /* Return the node in a chain of nodes whose value is x, NULL if not found. */
1793 tree_find_value (tree chain, tree x)
1796 for (list = chain; list; list = TREE_CHAIN (list))
1797 if (TREE_VALUE (list) == x)
1802 /* Reverse the order of elements in the chain T,
1803 and return the new head of the chain (old last element). */
1808 tree prev = 0, decl, next;
1809 for (decl = t; decl; decl = next)
1811 next = TREE_CHAIN (decl);
1812 TREE_CHAIN (decl) = prev;
1818 /* Return a newly created TREE_LIST node whose
1819 purpose and value fields are PARM and VALUE. */
1822 build_tree_list_stat (tree parm, tree value MEM_STAT_DECL)
1824 tree t = make_node_stat (TREE_LIST PASS_MEM_STAT);
1825 TREE_PURPOSE (t) = parm;
1826 TREE_VALUE (t) = value;
1830 /* Return a newly created TREE_LIST node whose
1831 purpose and value fields are PURPOSE and VALUE
1832 and whose TREE_CHAIN is CHAIN. */
1835 tree_cons_stat (tree purpose, tree value, tree chain MEM_STAT_DECL)
1839 node = (tree) ggc_alloc_zone_pass_stat (sizeof (struct tree_list), &tree_zone);
1841 memset (node, 0, sizeof (struct tree_common));
1843 #ifdef GATHER_STATISTICS
1844 tree_node_counts[(int) x_kind]++;
1845 tree_node_sizes[(int) x_kind] += sizeof (struct tree_list);
1848 TREE_SET_CODE (node, TREE_LIST);
1849 TREE_CHAIN (node) = chain;
1850 TREE_PURPOSE (node) = purpose;
1851 TREE_VALUE (node) = value;
1855 /* Return the elements of a CONSTRUCTOR as a TREE_LIST. */
1858 ctor_to_list (tree ctor)
1860 tree list = NULL_TREE;
1865 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (ctor), ix, purpose, val)
1867 *p = build_tree_list (purpose, val);
1868 p = &TREE_CHAIN (*p);
1874 /* Return the size nominally occupied by an object of type TYPE
1875 when it resides in memory. The value is measured in units of bytes,
1876 and its data type is that normally used for type sizes
1877 (which is the first type created by make_signed_type or
1878 make_unsigned_type). */
1881 size_in_bytes (const_tree type)
1885 if (type == error_mark_node)
1886 return integer_zero_node;
1888 type = TYPE_MAIN_VARIANT (type);
1889 t = TYPE_SIZE_UNIT (type);
1893 lang_hooks.types.incomplete_type_error (NULL_TREE, type);
1894 return size_zero_node;
1900 /* Return the size of TYPE (in bytes) as a wide integer
1901 or return -1 if the size can vary or is larger than an integer. */
1904 int_size_in_bytes (const_tree type)
1908 if (type == error_mark_node)
1911 type = TYPE_MAIN_VARIANT (type);
1912 t = TYPE_SIZE_UNIT (type);
1914 || TREE_CODE (t) != INTEGER_CST
1915 || TREE_INT_CST_HIGH (t) != 0
1916 /* If the result would appear negative, it's too big to represent. */
1917 || (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0)
1920 return TREE_INT_CST_LOW (t);
1923 /* Return the maximum size of TYPE (in bytes) as a wide integer
1924 or return -1 if the size can vary or is larger than an integer. */
1927 max_int_size_in_bytes (const_tree type)
1929 HOST_WIDE_INT size = -1;
1932 /* If this is an array type, check for a possible MAX_SIZE attached. */
1934 if (TREE_CODE (type) == ARRAY_TYPE)
1936 size_tree = TYPE_ARRAY_MAX_SIZE (type);
1938 if (size_tree && host_integerp (size_tree, 1))
1939 size = tree_low_cst (size_tree, 1);
1942 /* If we still haven't been able to get a size, see if the language
1943 can compute a maximum size. */
1947 size_tree = lang_hooks.types.max_size (type);
1949 if (size_tree && host_integerp (size_tree, 1))
1950 size = tree_low_cst (size_tree, 1);
1956 /* Return the bit position of FIELD, in bits from the start of the record.
1957 This is a tree of type bitsizetype. */
1960 bit_position (const_tree field)
1962 return bit_from_pos (DECL_FIELD_OFFSET (field),
1963 DECL_FIELD_BIT_OFFSET (field));
1966 /* Likewise, but return as an integer. It must be representable in
1967 that way (since it could be a signed value, we don't have the
1968 option of returning -1 like int_size_in_byte can. */
1971 int_bit_position (const_tree field)
1973 return tree_low_cst (bit_position (field), 0);
1976 /* Return the byte position of FIELD, in bytes from the start of the record.
1977 This is a tree of type sizetype. */
1980 byte_position (const_tree field)
1982 return byte_from_pos (DECL_FIELD_OFFSET (field),
1983 DECL_FIELD_BIT_OFFSET (field));
1986 /* Likewise, but return as an integer. It must be representable in
1987 that way (since it could be a signed value, we don't have the
1988 option of returning -1 like int_size_in_byte can. */
1991 int_byte_position (const_tree field)
1993 return tree_low_cst (byte_position (field), 0);
1996 /* Return the strictest alignment, in bits, that T is known to have. */
1999 expr_align (const_tree t)
2001 unsigned int align0, align1;
2003 switch (TREE_CODE (t))
2005 CASE_CONVERT: case NON_LVALUE_EXPR:
2006 /* If we have conversions, we know that the alignment of the
2007 object must meet each of the alignments of the types. */
2008 align0 = expr_align (TREE_OPERAND (t, 0));
2009 align1 = TYPE_ALIGN (TREE_TYPE (t));
2010 return MAX (align0, align1);
2012 case SAVE_EXPR: case COMPOUND_EXPR: case MODIFY_EXPR:
2013 case INIT_EXPR: case TARGET_EXPR: case WITH_CLEANUP_EXPR:
2014 case CLEANUP_POINT_EXPR:
2015 /* These don't change the alignment of an object. */
2016 return expr_align (TREE_OPERAND (t, 0));
2019 /* The best we can do is say that the alignment is the least aligned
2021 align0 = expr_align (TREE_OPERAND (t, 1));
2022 align1 = expr_align (TREE_OPERAND (t, 2));
2023 return MIN (align0, align1);
2025 /* FIXME: LABEL_DECL and CONST_DECL never have DECL_ALIGN set
2026 meaningfully, it's always 1. */
2027 case LABEL_DECL: case CONST_DECL:
2028 case VAR_DECL: case PARM_DECL: case RESULT_DECL:
2030 gcc_assert (DECL_ALIGN (t) != 0);
2031 return DECL_ALIGN (t);
2037 /* Otherwise take the alignment from that of the type. */
2038 return TYPE_ALIGN (TREE_TYPE (t));
2041 /* Return, as a tree node, the number of elements for TYPE (which is an
2042 ARRAY_TYPE) minus one. This counts only elements of the top array. */
2045 array_type_nelts (const_tree type)
2047 tree index_type, min, max;
2049 /* If they did it with unspecified bounds, then we should have already
2050 given an error about it before we got here. */
2051 if (! TYPE_DOMAIN (type))
2052 return error_mark_node;
2054 index_type = TYPE_DOMAIN (type);
2055 min = TYPE_MIN_VALUE (index_type);
2056 max = TYPE_MAX_VALUE (index_type);
2058 return (integer_zerop (min)
2060 : fold_build2 (MINUS_EXPR, TREE_TYPE (max), max, min));
2063 /* If arg is static -- a reference to an object in static storage -- then
2064 return the object. This is not the same as the C meaning of `static'.
2065 If arg isn't static, return NULL. */
2070 switch (TREE_CODE (arg))
2073 /* Nested functions are static, even though taking their address will
2074 involve a trampoline as we unnest the nested function and create
2075 the trampoline on the tree level. */
2079 return ((TREE_STATIC (arg) || DECL_EXTERNAL (arg))
2080 && ! DECL_THREAD_LOCAL_P (arg)
2081 && ! DECL_DLLIMPORT_P (arg)
2085 return ((TREE_STATIC (arg) || DECL_EXTERNAL (arg))
2089 return TREE_STATIC (arg) ? arg : NULL;
2096 /* If the thing being referenced is not a field, then it is
2097 something language specific. */
2098 gcc_assert (TREE_CODE (TREE_OPERAND (arg, 1)) == FIELD_DECL);
2100 /* If we are referencing a bitfield, we can't evaluate an
2101 ADDR_EXPR at compile time and so it isn't a constant. */
2102 if (DECL_BIT_FIELD (TREE_OPERAND (arg, 1)))
2105 return staticp (TREE_OPERAND (arg, 0));
2110 case MISALIGNED_INDIRECT_REF:
2111 case ALIGN_INDIRECT_REF:
2113 return TREE_CONSTANT (TREE_OPERAND (arg, 0)) ? arg : NULL;
2116 case ARRAY_RANGE_REF:
2117 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg))) == INTEGER_CST
2118 && TREE_CODE (TREE_OPERAND (arg, 1)) == INTEGER_CST)
2119 return staticp (TREE_OPERAND (arg, 0));
2123 case COMPOUND_LITERAL_EXPR:
2124 return TREE_STATIC (COMPOUND_LITERAL_EXPR_DECL (arg)) ? arg : NULL;
2134 /* Return whether OP is a DECL whose address is function-invariant. */
2137 decl_address_invariant_p (const_tree op)
2139 /* The conditions below are slightly less strict than the one in
2142 switch (TREE_CODE (op))
2151 if (((TREE_STATIC (op) || DECL_EXTERNAL (op))
2152 && !DECL_DLLIMPORT_P (op))
2153 || DECL_THREAD_LOCAL_P (op)
2154 || DECL_CONTEXT (op) == current_function_decl
2155 || decl_function_context (op) == current_function_decl)
2160 if ((TREE_STATIC (op) || DECL_EXTERNAL (op))
2161 || decl_function_context (op) == current_function_decl)
2172 /* Return whether OP is a DECL whose address is interprocedural-invariant. */
2175 decl_address_ip_invariant_p (const_tree op)
2177 /* The conditions below are slightly less strict than the one in
2180 switch (TREE_CODE (op))
2188 if (((TREE_STATIC (op) || DECL_EXTERNAL (op))
2189 && !DECL_DLLIMPORT_P (op))
2190 || DECL_THREAD_LOCAL_P (op))
2195 if ((TREE_STATIC (op) || DECL_EXTERNAL (op)))
2207 /* Return true if T is function-invariant (internal function, does
2208 not handle arithmetic; that's handled in skip_simple_arithmetic and
2209 tree_invariant_p). */
2211 static bool tree_invariant_p (tree t);
2214 tree_invariant_p_1 (tree t)
2218 if (TREE_CONSTANT (t)
2219 || (TREE_READONLY (t) && !TREE_SIDE_EFFECTS (t)))
2222 switch (TREE_CODE (t))
2228 op = TREE_OPERAND (t, 0);
2229 while (handled_component_p (op))
2231 switch (TREE_CODE (op))
2234 case ARRAY_RANGE_REF:
2235 if (!tree_invariant_p (TREE_OPERAND (op, 1))
2236 || TREE_OPERAND (op, 2) != NULL_TREE
2237 || TREE_OPERAND (op, 3) != NULL_TREE)
2242 if (TREE_OPERAND (op, 2) != NULL_TREE)
2248 op = TREE_OPERAND (op, 0);
2251 return CONSTANT_CLASS_P (op) || decl_address_invariant_p (op);
2260 /* Return true if T is function-invariant. */
2263 tree_invariant_p (tree t)
2265 tree inner = skip_simple_arithmetic (t);
2266 return tree_invariant_p_1 (inner);
2269 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
2270 Do this to any expression which may be used in more than one place,
2271 but must be evaluated only once.
2273 Normally, expand_expr would reevaluate the expression each time.
2274 Calling save_expr produces something that is evaluated and recorded
2275 the first time expand_expr is called on it. Subsequent calls to
2276 expand_expr just reuse the recorded value.
2278 The call to expand_expr that generates code that actually computes
2279 the value is the first call *at compile time*. Subsequent calls
2280 *at compile time* generate code to use the saved value.
2281 This produces correct result provided that *at run time* control
2282 always flows through the insns made by the first expand_expr
2283 before reaching the other places where the save_expr was evaluated.
2284 You, the caller of save_expr, must make sure this is so.
2286 Constants, and certain read-only nodes, are returned with no
2287 SAVE_EXPR because that is safe. Expressions containing placeholders
2288 are not touched; see tree.def for an explanation of what these
2292 save_expr (tree expr)
2294 tree t = fold (expr);
2297 /* If the tree evaluates to a constant, then we don't want to hide that
2298 fact (i.e. this allows further folding, and direct checks for constants).
2299 However, a read-only object that has side effects cannot be bypassed.
2300 Since it is no problem to reevaluate literals, we just return the
2302 inner = skip_simple_arithmetic (t);
2303 if (TREE_CODE (inner) == ERROR_MARK)
2306 if (tree_invariant_p_1 (inner))
2309 /* If INNER contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
2310 it means that the size or offset of some field of an object depends on
2311 the value within another field.
2313 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
2314 and some variable since it would then need to be both evaluated once and
2315 evaluated more than once. Front-ends must assure this case cannot
2316 happen by surrounding any such subexpressions in their own SAVE_EXPR
2317 and forcing evaluation at the proper time. */
2318 if (contains_placeholder_p (inner))
2321 t = build1 (SAVE_EXPR, TREE_TYPE (expr), t);
2323 /* This expression might be placed ahead of a jump to ensure that the
2324 value was computed on both sides of the jump. So make sure it isn't
2325 eliminated as dead. */
2326 TREE_SIDE_EFFECTS (t) = 1;
2330 /* Look inside EXPR and into any simple arithmetic operations. Return
2331 the innermost non-arithmetic node. */
2334 skip_simple_arithmetic (tree expr)
2338 /* We don't care about whether this can be used as an lvalue in this
2340 while (TREE_CODE (expr) == NON_LVALUE_EXPR)
2341 expr = TREE_OPERAND (expr, 0);
2343 /* If we have simple operations applied to a SAVE_EXPR or to a SAVE_EXPR and
2344 a constant, it will be more efficient to not make another SAVE_EXPR since
2345 it will allow better simplification and GCSE will be able to merge the
2346 computations if they actually occur. */
2350 if (UNARY_CLASS_P (inner))
2351 inner = TREE_OPERAND (inner, 0);
2352 else if (BINARY_CLASS_P (inner))
2354 if (tree_invariant_p (TREE_OPERAND (inner, 1)))
2355 inner = TREE_OPERAND (inner, 0);
2356 else if (tree_invariant_p (TREE_OPERAND (inner, 0)))
2357 inner = TREE_OPERAND (inner, 1);
2368 /* Return which tree structure is used by T. */
2370 enum tree_node_structure_enum
2371 tree_node_structure (const_tree t)
2373 const enum tree_code code = TREE_CODE (t);
2375 switch (TREE_CODE_CLASS (code))
2377 case tcc_declaration:
2382 return TS_FIELD_DECL;
2384 return TS_PARM_DECL;
2388 return TS_LABEL_DECL;
2390 return TS_RESULT_DECL;
2392 return TS_CONST_DECL;
2394 return TS_TYPE_DECL;
2396 return TS_FUNCTION_DECL;
2398 return TS_DECL_NON_COMMON;
2404 case tcc_comparison:
2407 case tcc_expression:
2411 default: /* tcc_constant and tcc_exceptional */
2416 /* tcc_constant cases. */
2417 case INTEGER_CST: return TS_INT_CST;
2418 case REAL_CST: return TS_REAL_CST;
2419 case FIXED_CST: return TS_FIXED_CST;
2420 case COMPLEX_CST: return TS_COMPLEX;
2421 case VECTOR_CST: return TS_VECTOR;
2422 case STRING_CST: return TS_STRING;
2423 /* tcc_exceptional cases. */
2424 case ERROR_MARK: return TS_COMMON;
2425 case IDENTIFIER_NODE: return TS_IDENTIFIER;
2426 case TREE_LIST: return TS_LIST;
2427 case TREE_VEC: return TS_VEC;
2428 case SSA_NAME: return TS_SSA_NAME;
2429 case PLACEHOLDER_EXPR: return TS_COMMON;
2430 case STATEMENT_LIST: return TS_STATEMENT_LIST;
2431 case BLOCK: return TS_BLOCK;
2432 case CONSTRUCTOR: return TS_CONSTRUCTOR;
2433 case TREE_BINFO: return TS_BINFO;
2434 case OMP_CLAUSE: return TS_OMP_CLAUSE;
2435 case OPTIMIZATION_NODE: return TS_OPTIMIZATION;
2436 case TARGET_OPTION_NODE: return TS_TARGET_OPTION;
2443 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
2444 or offset that depends on a field within a record. */
2447 contains_placeholder_p (const_tree exp)
2449 enum tree_code code;
2454 code = TREE_CODE (exp);
2455 if (code == PLACEHOLDER_EXPR)
2458 switch (TREE_CODE_CLASS (code))
2461 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
2462 position computations since they will be converted into a
2463 WITH_RECORD_EXPR involving the reference, which will assume
2464 here will be valid. */
2465 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));
2467 case tcc_exceptional:
2468 if (code == TREE_LIST)
2469 return (CONTAINS_PLACEHOLDER_P (TREE_VALUE (exp))
2470 || CONTAINS_PLACEHOLDER_P (TREE_CHAIN (exp)));
2475 case tcc_comparison:
2476 case tcc_expression:
2480 /* Ignoring the first operand isn't quite right, but works best. */
2481 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1));
2484 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0))
2485 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1))
2486 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 2)));
2489 /* The save_expr function never wraps anything containing
2490 a PLACEHOLDER_EXPR. */
2497 switch (TREE_CODE_LENGTH (code))
2500 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0));
2502 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 0))
2503 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp, 1)));
2514 const_call_expr_arg_iterator iter;
2515 FOR_EACH_CONST_CALL_EXPR_ARG (arg, iter, exp)
2516 if (CONTAINS_PLACEHOLDER_P (arg))
2530 /* Return true if any part of the computation of TYPE involves a
2531 PLACEHOLDER_EXPR. This includes size, bounds, qualifiers
2532 (for QUAL_UNION_TYPE) and field positions. */
2535 type_contains_placeholder_1 (const_tree type)
2537 /* If the size contains a placeholder or the parent type (component type in
2538 the case of arrays) type involves a placeholder, this type does. */
2539 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type))
2540 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (type))
2541 || (TREE_TYPE (type) != 0
2542 && type_contains_placeholder_p (TREE_TYPE (type))))
2545 /* Now do type-specific checks. Note that the last part of the check above
2546 greatly limits what we have to do below. */
2547 switch (TREE_CODE (type))
2555 case REFERENCE_TYPE:
2563 case FIXED_POINT_TYPE:
2564 /* Here we just check the bounds. */
2565 return (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (type))
2566 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (type)));
2569 /* We're already checked the component type (TREE_TYPE), so just check
2571 return type_contains_placeholder_p (TYPE_DOMAIN (type));
2575 case QUAL_UNION_TYPE:
2579 for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
2580 if (TREE_CODE (field) == FIELD_DECL
2581 && (CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (field))
2582 || (TREE_CODE (type) == QUAL_UNION_TYPE
2583 && CONTAINS_PLACEHOLDER_P (DECL_QUALIFIER (field)))
2584 || type_contains_placeholder_p (TREE_TYPE (field))))
2596 type_contains_placeholder_p (tree type)
2600 /* If the contains_placeholder_bits field has been initialized,
2601 then we know the answer. */
2602 if (TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) > 0)
2603 return TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) - 1;
2605 /* Indicate that we've seen this type node, and the answer is false.
2606 This is what we want to return if we run into recursion via fields. */
2607 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) = 1;
2609 /* Compute the real value. */
2610 result = type_contains_placeholder_1 (type);
2612 /* Store the real value. */
2613 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type) = result + 1;
2618 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
2619 return a tree with all occurrences of references to F in a
2620 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
2621 contains only arithmetic expressions or a CALL_EXPR with a
2622 PLACEHOLDER_EXPR occurring only in its arglist. */
2625 substitute_in_expr (tree exp, tree f, tree r)
2627 enum tree_code code = TREE_CODE (exp);
2628 tree op0, op1, op2, op3;
2629 tree new_tree, inner;
2631 /* We handle TREE_LIST and COMPONENT_REF separately. */
2632 if (code == TREE_LIST)
2634 op0 = SUBSTITUTE_IN_EXPR (TREE_CHAIN (exp), f, r);
2635 op1 = SUBSTITUTE_IN_EXPR (TREE_VALUE (exp), f, r);
2636 if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
2639 return tree_cons (TREE_PURPOSE (exp), op1, op0);
2641 else if (code == COMPONENT_REF)
2643 /* If this expression is getting a value from a PLACEHOLDER_EXPR
2644 and it is the right field, replace it with R. */
2645 for (inner = TREE_OPERAND (exp, 0);
2646 REFERENCE_CLASS_P (inner);
2647 inner = TREE_OPERAND (inner, 0))
2649 if (TREE_CODE (inner) == PLACEHOLDER_EXPR
2650 && TREE_OPERAND (exp, 1) == f)
2653 /* If this expression hasn't been completed let, leave it alone. */
2654 if (TREE_CODE (inner) == PLACEHOLDER_EXPR && TREE_TYPE (inner) == 0)
2657 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
2658 if (op0 == TREE_OPERAND (exp, 0))
2661 new_tree = fold_build3 (COMPONENT_REF, TREE_TYPE (exp),
2662 op0, TREE_OPERAND (exp, 1), NULL_TREE);
2665 switch (TREE_CODE_CLASS (code))
2668 case tcc_declaration:
2671 case tcc_exceptional:
2674 case tcc_comparison:
2675 case tcc_expression:
2677 switch (TREE_CODE_LENGTH (code))
2683 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
2684 if (op0 == TREE_OPERAND (exp, 0))
2687 new_tree = fold_build1 (code, TREE_TYPE (exp), op0);
2691 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
2692 op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
2694 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
2697 new_tree = fold_build2 (code, TREE_TYPE (exp), op0, op1);
2701 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
2702 op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
2703 op2 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 2), f, r);
2705 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
2706 && op2 == TREE_OPERAND (exp, 2))
2709 new_tree = fold_build3 (code, TREE_TYPE (exp), op0, op1, op2);
2713 op0 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 0), f, r);
2714 op1 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 1), f, r);
2715 op2 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 2), f, r);
2716 op3 = SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp, 3), f, r);
2718 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
2719 && op2 == TREE_OPERAND (exp, 2)
2720 && op3 == TREE_OPERAND (exp, 3))
2723 new_tree = fold (build4 (code, TREE_TYPE (exp), op0, op1, op2, op3));
2733 tree copy = NULL_TREE;
2736 for (i = 1; i < TREE_OPERAND_LENGTH (exp); i++)
2738 tree op = TREE_OPERAND (exp, i);
2739 tree new_op = SUBSTITUTE_IN_EXPR (op, f, r);
2743 copy = copy_node (exp);
2744 TREE_OPERAND (copy, i) = new_op;
2749 new_tree = fold (copy);
2759 TREE_READONLY (new_tree) = TREE_READONLY (exp);
2763 /* Similar, but look for a PLACEHOLDER_EXPR in EXP and find a replacement
2764 for it within OBJ, a tree that is an object or a chain of references. */
2767 substitute_placeholder_in_expr (tree exp, tree obj)
2769 enum tree_code code = TREE_CODE (exp);
2770 tree op0, op1, op2, op3;
2772 /* If this is a PLACEHOLDER_EXPR, see if we find a corresponding type
2773 in the chain of OBJ. */
2774 if (code == PLACEHOLDER_EXPR)
2776 tree need_type = TYPE_MAIN_VARIANT (TREE_TYPE (exp));
2779 for (elt = obj; elt != 0;
2780 elt = ((TREE_CODE (elt) == COMPOUND_EXPR
2781 || TREE_CODE (elt) == COND_EXPR)
2782 ? TREE_OPERAND (elt, 1)
2783 : (REFERENCE_CLASS_P (elt)
2784 || UNARY_CLASS_P (elt)
2785 || BINARY_CLASS_P (elt)
2786 || VL_EXP_CLASS_P (elt)
2787 || EXPRESSION_CLASS_P (elt))
2788 ? TREE_OPERAND (elt, 0) : 0))
2789 if (TYPE_MAIN_VARIANT (TREE_TYPE (elt)) == need_type)
2792 for (elt = obj; elt != 0;
2793 elt = ((TREE_CODE (elt) == COMPOUND_EXPR
2794 || TREE_CODE (elt) == COND_EXPR)
2795 ? TREE_OPERAND (elt, 1)
2796 : (REFERENCE_CLASS_P (elt)
2797 || UNARY_CLASS_P (elt)
2798 || BINARY_CLASS_P (elt)
2799 || VL_EXP_CLASS_P (elt)
2800 || EXPRESSION_CLASS_P (elt))
2801 ? TREE_OPERAND (elt, 0) : 0))
2802 if (POINTER_TYPE_P (TREE_TYPE (elt))
2803 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (elt)))
2805 return fold_build1 (INDIRECT_REF, need_type, elt);
2807 /* If we didn't find it, return the original PLACEHOLDER_EXPR. If it
2808 survives until RTL generation, there will be an error. */
2812 /* TREE_LIST is special because we need to look at TREE_VALUE
2813 and TREE_CHAIN, not TREE_OPERANDS. */
2814 else if (code == TREE_LIST)
2816 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp), obj);
2817 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp), obj);
2818 if (op0 == TREE_CHAIN (exp) && op1 == TREE_VALUE (exp))
2821 return tree_cons (TREE_PURPOSE (exp), op1, op0);
2824 switch (TREE_CODE_CLASS (code))
2827 case tcc_declaration:
2830 case tcc_exceptional:
2833 case tcc_comparison:
2834 case tcc_expression:
2837 switch (TREE_CODE_LENGTH (code))
2843 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
2844 if (op0 == TREE_OPERAND (exp, 0))
2847 return fold_build1 (code, TREE_TYPE (exp), op0);
2850 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
2851 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
2853 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1))
2856 return fold_build2 (code, TREE_TYPE (exp), op0, op1);
2859 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
2860 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
2861 op2 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 2), obj);
2863 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
2864 && op2 == TREE_OPERAND (exp, 2))
2867 return fold_build3 (code, TREE_TYPE (exp), op0, op1, op2);
2870 op0 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 0), obj);
2871 op1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 1), obj);
2872 op2 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 2), obj);
2873 op3 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp, 3), obj);
2875 if (op0 == TREE_OPERAND (exp, 0) && op1 == TREE_OPERAND (exp, 1)
2876 && op2 == TREE_OPERAND (exp, 2)
2877 && op3 == TREE_OPERAND (exp, 3))
2880 return fold (build4 (code, TREE_TYPE (exp), op0, op1, op2, op3));
2889 tree copy = NULL_TREE;
2892 for (i = 1; i < TREE_OPERAND_LENGTH (exp); i++)
2894 tree op = TREE_OPERAND (exp, i);
2895 tree new_op = SUBSTITUTE_PLACEHOLDER_IN_EXPR (op, obj);
2899 copy = copy_node (exp);
2900 TREE_OPERAND (copy, i) = new_op;
2915 /* Stabilize a reference so that we can use it any number of times
2916 without causing its operands to be evaluated more than once.
2917 Returns the stabilized reference. This works by means of save_expr,
2918 so see the caveats in the comments about save_expr.
2920 Also allows conversion expressions whose operands are references.
2921 Any other kind of expression is returned unchanged. */
2924 stabilize_reference (tree ref)
2927 enum tree_code code = TREE_CODE (ref);
2934 /* No action is needed in this case. */
2939 case FIX_TRUNC_EXPR:
2940 result = build_nt (code, stabilize_reference (TREE_OPERAND (ref, 0)));
2944 result = build_nt (INDIRECT_REF,
2945 stabilize_reference_1 (TREE_OPERAND (ref, 0)));
2949 result = build_nt (COMPONENT_REF,
2950 stabilize_reference (TREE_OPERAND (ref, 0)),
2951 TREE_OPERAND (ref, 1), NULL_TREE);
2955 result = build_nt (BIT_FIELD_REF,
2956 stabilize_reference (TREE_OPERAND (ref, 0)),
2957 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
2958 stabilize_reference_1 (TREE_OPERAND (ref, 2)));
2962 result = build_nt (ARRAY_REF,
2963 stabilize_reference (TREE_OPERAND (ref, 0)),
2964 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
2965 TREE_OPERAND (ref, 2), TREE_OPERAND (ref, 3));
2968 case ARRAY_RANGE_REF:
2969 result = build_nt (ARRAY_RANGE_REF,
2970 stabilize_reference (TREE_OPERAND (ref, 0)),
2971 stabilize_reference_1 (TREE_OPERAND (ref, 1)),
2972 TREE_OPERAND (ref, 2), TREE_OPERAND (ref, 3));
2976 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2977 it wouldn't be ignored. This matters when dealing with
2979 return stabilize_reference_1 (ref);
2981 /* If arg isn't a kind of lvalue we recognize, make no change.
2982 Caller should recognize the error for an invalid lvalue. */
2987 return error_mark_node;
2990 TREE_TYPE (result) = TREE_TYPE (ref);
2991 TREE_READONLY (result) = TREE_READONLY (ref);
2992 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (ref);
2993 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);
2998 /* Subroutine of stabilize_reference; this is called for subtrees of
2999 references. Any expression with side-effects must be put in a SAVE_EXPR
3000 to ensure that it is only evaluated once.
3002 We don't put SAVE_EXPR nodes around everything, because assigning very
3003 simple expressions to temporaries causes us to miss good opportunities
3004 for optimizations. Among other things, the opportunity to fold in the
3005 addition of a constant into an addressing mode often gets lost, e.g.
3006 "y[i+1] += x;". In general, we take the approach that we should not make
3007 an assignment unless we are forced into it - i.e., that any non-side effect
3008 operator should be allowed, and that cse should take care of coalescing
3009 multiple utterances of the same expression should that prove fruitful. */
3012 stabilize_reference_1 (tree e)
3015 enum tree_code code = TREE_CODE (e);
3017 /* We cannot ignore const expressions because it might be a reference
3018 to a const array but whose index contains side-effects. But we can
3019 ignore things that are actual constant or that already have been
3020 handled by this function. */
3022 if (tree_invariant_p (e))
3025 switch (TREE_CODE_CLASS (code))
3027 case tcc_exceptional:
3029 case tcc_declaration:
3030 case tcc_comparison:
3032 case tcc_expression:
3035 /* If the expression has side-effects, then encase it in a SAVE_EXPR
3036 so that it will only be evaluated once. */
3037 /* The reference (r) and comparison (<) classes could be handled as
3038 below, but it is generally faster to only evaluate them once. */
3039 if (TREE_SIDE_EFFECTS (e))
3040 return save_expr (e);
3044 /* Constants need no processing. In fact, we should never reach
3049 /* Division is slow and tends to be compiled with jumps,
3050 especially the division by powers of 2 that is often
3051 found inside of an array reference. So do it just once. */
3052 if (code == TRUNC_DIV_EXPR || code == TRUNC_MOD_EXPR
3053 || code == FLOOR_DIV_EXPR || code == FLOOR_MOD_EXPR
3054 || code == CEIL_DIV_EXPR || code == CEIL_MOD_EXPR
3055 || code == ROUND_DIV_EXPR || code == ROUND_MOD_EXPR)
3056 return save_expr (e);
3057 /* Recursively stabilize each operand. */
3058 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)),
3059 stabilize_reference_1 (TREE_OPERAND (e, 1)));
3063 /* Recursively stabilize each operand. */
3064 result = build_nt (code, stabilize_reference_1 (TREE_OPERAND (e, 0)));
3071 TREE_TYPE (result) = TREE_TYPE (e);
3072 TREE_READONLY (result) = TREE_READONLY (e);
3073 TREE_SIDE_EFFECTS (result) = TREE_SIDE_EFFECTS (e);
3074 TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);
3079 /* Low-level constructors for expressions. */
3081 /* A helper function for build1 and constant folders. Set TREE_CONSTANT,
3082 and TREE_SIDE_EFFECTS for an ADDR_EXPR. */
3085 recompute_tree_invariant_for_addr_expr (tree t)
3088 bool tc = true, se = false;
3090 /* We started out assuming this address is both invariant and constant, but
3091 does not have side effects. Now go down any handled components and see if
3092 any of them involve offsets that are either non-constant or non-invariant.
3093 Also check for side-effects.
3095 ??? Note that this code makes no attempt to deal with the case where
3096 taking the address of something causes a copy due to misalignment. */
3098 #define UPDATE_FLAGS(NODE) \
3099 do { tree _node = (NODE); \
3100 if (_node && !TREE_CONSTANT (_node)) tc = false; \
3101 if (_node && TREE_SIDE_EFFECTS (_node)) se = true; } while (0)
3103 for (node = TREE_OPERAND (t, 0); handled_component_p (node);
3104 node = TREE_OPERAND (node, 0))
3106 /* If the first operand doesn't have an ARRAY_TYPE, this is a bogus
3107 array reference (probably made temporarily by the G++ front end),
3108 so ignore all the operands. */
3109 if ((TREE_CODE (node) == ARRAY_REF
3110 || TREE_CODE (node) == ARRAY_RANGE_REF)
3111 && TREE_CODE (TREE_TYPE (TREE_OPERAND (node, 0))) == ARRAY_TYPE)
3113 UPDATE_FLAGS (TREE_OPERAND (node, 1));
3114 if (TREE_OPERAND (node, 2))
3115 UPDATE_FLAGS (TREE_OPERAND (node, 2));
3116 if (TREE_OPERAND (node, 3))
3117 UPDATE_FLAGS (TREE_OPERAND (node, 3));
3119 /* Likewise, just because this is a COMPONENT_REF doesn't mean we have a
3120 FIELD_DECL, apparently. The G++ front end can put something else
3121 there, at least temporarily. */
3122 else if (TREE_CODE (node) == COMPONENT_REF
3123 && TREE_CODE (TREE_OPERAND (node, 1)) == FIELD_DECL)
3125 if (TREE_OPERAND (node, 2))
3126 UPDATE_FLAGS (TREE_OPERAND (node, 2));
3128 else if (TREE_CODE (node) == BIT_FIELD_REF)
3129 UPDATE_FLAGS (TREE_OPERAND (node, 2));
3132 node = lang_hooks.expr_to_decl (node, &tc, &se);
3134 /* Now see what's inside. If it's an INDIRECT_REF, copy our properties from
3135 the address, since &(*a)->b is a form of addition. If it's a constant, the
3136 address is constant too. If it's a decl, its address is constant if the
3137 decl is static. Everything else is not constant and, furthermore,
3138 taking the address of a volatile variable is not volatile. */
3139 if (TREE_CODE (node) == INDIRECT_REF)
3140 UPDATE_FLAGS (TREE_OPERAND (node, 0));
3141 else if (CONSTANT_CLASS_P (node))
3143 else if (DECL_P (node))
3144 tc &= (staticp (node) != NULL_TREE);
3148 se |= TREE_SIDE_EFFECTS (node);
3152 TREE_CONSTANT (t) = tc;
3153 TREE_SIDE_EFFECTS (t) = se;
3157 /* Build an expression of code CODE, data type TYPE, and operands as
3158 specified. Expressions and reference nodes can be created this way.
3159 Constants, decls, types and misc nodes cannot be.
3161 We define 5 non-variadic functions, from 0 to 4 arguments. This is
3162 enough for all extant tree codes. */
3165 build0_stat (enum tree_code code, tree tt MEM_STAT_DECL)
3169 gcc_assert (TREE_CODE_LENGTH (code) == 0);
3171 t = make_node_stat (code PASS_MEM_STAT);
3178 build1_stat (enum tree_code code, tree type, tree node MEM_STAT_DECL)
3180 int length = sizeof (struct tree_exp);
3181 #ifdef GATHER_STATISTICS
3182 tree_node_kind kind;
3186 #ifdef GATHER_STATISTICS
3187 switch (TREE_CODE_CLASS (code))
3189 case tcc_statement: /* an expression with side effects */
3192 case tcc_reference: /* a reference */
3200 tree_node_counts[(int) kind]++;
3201 tree_node_sizes[(int) kind] += length;
3204 gcc_assert (TREE_CODE_LENGTH (code) == 1);
3206 t = (tree) ggc_alloc_zone_pass_stat (length, &tree_zone);
3208 memset (t, 0, sizeof (struct tree_common));
3210 TREE_SET_CODE (t, code);
3212 TREE_TYPE (t) = type;
3213 SET_EXPR_LOCATION (t, UNKNOWN_LOCATION);
3214 TREE_OPERAND (t, 0) = node;
3215 TREE_BLOCK (t) = NULL_TREE;
3216 if (node && !TYPE_P (node))
3218 TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (node);
3219 TREE_READONLY (t) = TREE_READONLY (node);
3222 if (TREE_CODE_CLASS (code) == tcc_statement)
3223 TREE_SIDE_EFFECTS (t) = 1;
3227 /* All of these have side-effects, no matter what their
3229 TREE_SIDE_EFFECTS (t) = 1;
3230 TREE_READONLY (t) = 0;
3233 case MISALIGNED_INDIRECT_REF:
3234 case ALIGN_INDIRECT_REF:
3236 /* Whether a dereference is readonly has nothing to do with whether
3237 its operand is readonly. */
3238 TREE_READONLY (t) = 0;
3243 recompute_tree_invariant_for_addr_expr (t);
3247 if ((TREE_CODE_CLASS (code) == tcc_unary || code == VIEW_CONVERT_EXPR)
3248 && node && !TYPE_P (node)
3249 && TREE_CONSTANT (node))
3250 TREE_CONSTANT (t) = 1;
3251 if (TREE_CODE_CLASS (code) == tcc_reference
3252 && node && TREE_THIS_VOLATILE (node))
3253 TREE_THIS_VOLATILE (t) = 1;
3260 #define PROCESS_ARG(N) \
3262 TREE_OPERAND (t, N) = arg##N; \
3263 if (arg##N &&!TYPE_P (arg##N)) \
3265 if (TREE_SIDE_EFFECTS (arg##N)) \
3267 if (!TREE_READONLY (arg##N)) \
3269 if (!TREE_CONSTANT (arg##N)) \
3275 build2_stat (enum tree_code code, tree tt, tree arg0, tree arg1 MEM_STAT_DECL)
3277 bool constant, read_only, side_effects;
3280 gcc_assert (TREE_CODE_LENGTH (code) == 2);
3282 if ((code == MINUS_EXPR || code == PLUS_EXPR || code == MULT_EXPR)
3283 && arg0 && arg1 && tt && POINTER_TYPE_P (tt)
3284 /* When sizetype precision doesn't match that of pointers
3285 we need to be able to build explicit extensions or truncations
3286 of the offset argument. */
3287 && TYPE_PRECISION (sizetype) == TYPE_PRECISION (tt))
3288 gcc_assert (TREE_CODE (arg0) == INTEGER_CST
3289 && TREE_CODE (arg1) == INTEGER_CST);
3291 if (code == POINTER_PLUS_EXPR && arg0 && arg1 && tt)
3292 gcc_assert (POINTER_TYPE_P (tt) && POINTER_TYPE_P (TREE_TYPE (arg0))
3293 && INTEGRAL_TYPE_P (TREE_TYPE (arg1))
3294 && useless_type_conversion_p (sizetype, TREE_TYPE (arg1)));
3296 t = make_node_stat (code PASS_MEM_STAT);
3299 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
3300 result based on those same flags for the arguments. But if the
3301 arguments aren't really even `tree' expressions, we shouldn't be trying
3304 /* Expressions without side effects may be constant if their
3305 arguments are as well. */
3306 constant = (TREE_CODE_CLASS (code) == tcc_comparison
3307 || TREE_CODE_CLASS (code) == tcc_binary);
3309 side_effects = TREE_SIDE_EFFECTS (t);
3314 TREE_READONLY (t) = read_only;
3315 TREE_CONSTANT (t) = constant;
3316 TREE_SIDE_EFFECTS (t) = side_effects;
3317 TREE_THIS_VOLATILE (t)
3318 = (TREE_CODE_CLASS (code) == tcc_reference
3319 && arg0 && TREE_THIS_VOLATILE (arg0));
3326 build3_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
3327 tree arg2 MEM_STAT_DECL)
3329 bool constant, read_only, side_effects;
3332 gcc_assert (TREE_CODE_LENGTH (code) == 3);
3333 gcc_assert (TREE_CODE_CLASS (code) != tcc_vl_exp);
3335 t = make_node_stat (code PASS_MEM_STAT);
3338 /* As a special exception, if COND_EXPR has NULL branches, we
3339 assume that it is a gimple statement and always consider
3340 it to have side effects. */
3341 if (code == COND_EXPR
3342 && tt == void_type_node
3343 && arg1 == NULL_TREE
3344 && arg2 == NULL_TREE)
3345 side_effects = true;
3347 side_effects = TREE_SIDE_EFFECTS (t);
3353 TREE_SIDE_EFFECTS (t) = side_effects;
3354 TREE_THIS_VOLATILE (t)
3355 = (TREE_CODE_CLASS (code) == tcc_reference
3356 && arg0 && TREE_THIS_VOLATILE (arg0));
3362 build4_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
3363 tree arg2, tree arg3 MEM_STAT_DECL)
3365 bool constant, read_only, side_effects;
3368 gcc_assert (TREE_CODE_LENGTH (code) == 4);
3370 t = make_node_stat (code PASS_MEM_STAT);
3373 side_effects = TREE_SIDE_EFFECTS (t);
3380 TREE_SIDE_EFFECTS (t) = side_effects;
3381 TREE_THIS_VOLATILE (t)
3382 = (TREE_CODE_CLASS (code) == tcc_reference
3383 && arg0 && TREE_THIS_VOLATILE (arg0));
3389 build5_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
3390 tree arg2, tree arg3, tree arg4 MEM_STAT_DECL)
3392 bool constant, read_only, side_effects;
3395 gcc_assert (TREE_CODE_LENGTH (code) == 5);
3397 t = make_node_stat (code PASS_MEM_STAT);
3400 side_effects = TREE_SIDE_EFFECTS (t);
3408 TREE_SIDE_EFFECTS (t) = side_effects;
3409 TREE_THIS_VOLATILE (t)
3410 = (TREE_CODE_CLASS (code) == tcc_reference
3411 && arg0 && TREE_THIS_VOLATILE (arg0));
3417 build6_stat (enum tree_code code, tree tt, tree arg0, tree arg1,
3418 tree arg2, tree arg3, tree arg4, tree arg5 MEM_STAT_DECL)
3420 bool constant, read_only, side_effects;
3423 gcc_assert (code == TARGET_MEM_REF);
3425 t = make_node_stat (code PASS_MEM_STAT);
3428 side_effects = TREE_SIDE_EFFECTS (t);
3437 TREE_SIDE_EFFECTS (t) = side_effects;
3438 TREE_THIS_VOLATILE (t) = 0;
3443 /* Similar except don't specify the TREE_TYPE
3444 and leave the TREE_SIDE_EFFECTS as 0.
3445 It is permissible for arguments to be null,
3446 or even garbage if their values do not matter. */
3449 build_nt (enum tree_code code, ...)
3456 gcc_assert (TREE_CODE_CLASS (code) != tcc_vl_exp);
3460 t = make_node (code);
3461 length = TREE_CODE_LENGTH (code);
3463 for (i = 0; i < length; i++)
3464 TREE_OPERAND (t, i) = va_arg (p, tree);
3470 /* Similar to build_nt, but for creating a CALL_EXPR object with
3471 ARGLIST passed as a list. */
3474 build_nt_call_list (tree fn, tree arglist)
3479 t = build_vl_exp (CALL_EXPR, list_length (arglist) + 3);
3480 CALL_EXPR_FN (t) = fn;
3481 CALL_EXPR_STATIC_CHAIN (t) = NULL_TREE;
3482 for (i = 0; arglist; arglist = TREE_CHAIN (arglist), i++)
3483 CALL_EXPR_ARG (t, i) = TREE_VALUE (arglist);
3487 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
3488 We do NOT enter this node in any sort of symbol table.
3490 layout_decl is used to set up the decl's storage layout.
3491 Other slots are initialized to 0 or null pointers. */
3494 build_decl_stat (enum tree_code code, tree name, tree type MEM_STAT_DECL)
3498 t = make_node_stat (code PASS_MEM_STAT);
3500 /* if (type == error_mark_node)
3501 type = integer_type_node; */
3502 /* That is not done, deliberately, so that having error_mark_node
3503 as the type can suppress useless errors in the use of this variable. */
3505 DECL_NAME (t) = name;
3506 TREE_TYPE (t) = type;
3508 if (code == VAR_DECL || code == PARM_DECL || code == RESULT_DECL)
3514 /* Builds and returns function declaration with NAME and TYPE. */
3517 build_fn_decl (const char *name, tree type)
3519 tree id = get_identifier (name);
3520 tree decl = build_decl (FUNCTION_DECL, id, type);
3522 DECL_EXTERNAL (decl) = 1;
3523 TREE_PUBLIC (decl) = 1;
3524 DECL_ARTIFICIAL (decl) = 1;
3525 TREE_NOTHROW (decl) = 1;
3531 /* BLOCK nodes are used to represent the structure of binding contours
3532 and declarations, once those contours have been exited and their contents
3533 compiled. This information is used for outputting debugging info. */
3536 build_block (tree vars, tree subblocks, tree supercontext, tree chain)
3538 tree block = make_node (BLOCK);
3540 BLOCK_VARS (block) = vars;
3541 BLOCK_SUBBLOCKS (block) = subblocks;
3542 BLOCK_SUPERCONTEXT (block) = supercontext;
3543 BLOCK_CHAIN (block) = chain;
3548 expand_location (source_location loc)
3550 expanded_location xloc;
3560 const struct line_map *map = linemap_lookup (line_table, loc);
3561 xloc.file = map->to_file;
3562 xloc.line = SOURCE_LINE (map, loc);
3563 xloc.column = SOURCE_COLUMN (map, loc);
3564 xloc.sysp = map->sysp != 0;
3570 /* Source location accessor functions. */
3574 set_expr_locus (tree node, source_location *loc)
3577 EXPR_CHECK (node)->exp.locus = UNKNOWN_LOCATION;
3579 EXPR_CHECK (node)->exp.locus = *loc;
3582 /* Like SET_EXPR_LOCATION, but make sure the tree can have a location.
3584 LOC is the location to use in tree T. */
3587 protected_set_expr_location (tree t, location_t loc)
3589 if (t && CAN_HAVE_LOCATION_P (t))
3590 SET_EXPR_LOCATION (t, loc);
3593 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
3597 build_decl_attribute_variant (tree ddecl, tree attribute)
3599 DECL_ATTRIBUTES (ddecl) = attribute;
3603 /* Borrowed from hashtab.c iterative_hash implementation. */
3604 #define mix(a,b,c) \
3606 a -= b; a -= c; a ^= (c>>13); \
3607 b -= c; b -= a; b ^= (a<< 8); \
3608 c -= a; c -= b; c ^= ((b&0xffffffff)>>13); \
3609 a -= b; a -= c; a ^= ((c&0xffffffff)>>12); \
3610 b -= c; b -= a; b = (b ^ (a<<16)) & 0xffffffff; \
3611 c -= a; c -= b; c = (c ^ (b>> 5)) & 0xffffffff; \
3612 a -= b; a -= c; a = (a ^ (c>> 3)) & 0xffffffff; \
3613 b -= c; b -= a; b = (b ^ (a<<10)) & 0xffffffff; \
3614 c -= a; c -= b; c = (c ^ (b>>15)) & 0xffffffff; \
3618 /* Produce good hash value combining VAL and VAL2. */
3620 iterative_hash_hashval_t (hashval_t val, hashval_t val2)
3622 /* the golden ratio; an arbitrary value. */
3623 hashval_t a = 0x9e3779b9;
3629 /* Produce good hash value combining VAL and VAL2. */
3630 static inline hashval_t
3631 iterative_hash_host_wide_int (HOST_WIDE_INT val, hashval_t val2)
3633 if (sizeof (HOST_WIDE_INT) == sizeof (hashval_t))
3634 return iterative_hash_hashval_t (val, val2);
3637 hashval_t a = (hashval_t) val;
3638 /* Avoid warnings about shifting of more than the width of the type on
3639 hosts that won't execute this path. */
3641 hashval_t b = (hashval_t) (val >> (sizeof (hashval_t) * 8 + zero));
3643 if (sizeof (HOST_WIDE_INT) > 2 * sizeof (hashval_t))
3645 hashval_t a = (hashval_t) (val >> (sizeof (hashval_t) * 16 + zero));
3646 hashval_t b = (hashval_t) (val >> (sizeof (hashval_t) * 24 + zero));
3653 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
3654 is ATTRIBUTE and its qualifiers are QUALS.
3656 Record such modified types already made so we don't make duplicates. */
3659 build_type_attribute_qual_variant (tree ttype, tree attribute, int quals)
3661 if (! attribute_list_equal (TYPE_ATTRIBUTES (ttype), attribute))
3663 hashval_t hashcode = 0;
3665 enum tree_code code = TREE_CODE (ttype);
3667 /* Building a distinct copy of a tagged type is inappropriate; it
3668 causes breakage in code that expects there to be a one-to-one
3669 relationship between a struct and its fields.
3670 build_duplicate_type is another solution (as used in
3671 handle_transparent_union_attribute), but that doesn't play well
3672 with the stronger C++ type identity model. */
3673 if (TREE_CODE (ttype) == RECORD_TYPE
3674 || TREE_CODE (ttype) == UNION_TYPE
3675 || TREE_CODE (ttype) == QUAL_UNION_TYPE
3676 || TREE_CODE (ttype) == ENUMERAL_TYPE)
3678 warning (OPT_Wattributes,
3679 "ignoring attributes applied to %qT after definition",
3680 TYPE_MAIN_VARIANT (ttype));
3681 return build_qualified_type (ttype, quals);
3684 ttype = build_qualified_type (ttype, TYPE_UNQUALIFIED);
3685 ntype = build_distinct_type_copy (ttype);
3687 TYPE_ATTRIBUTES (ntype) = attribute;
3689 hashcode = iterative_hash_object (code, hashcode);
3690 if (TREE_TYPE (ntype))
3691 hashcode = iterative_hash_object (TYPE_HASH (TREE_TYPE (ntype)),
3693 hashcode = attribute_hash_list (attribute, hashcode);
3695 switch (TREE_CODE (ntype))
3698 hashcode = type_hash_list (TYPE_ARG_TYPES (ntype), hashcode);
3701 if (TYPE_DOMAIN (ntype))
3702 hashcode = iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (ntype)),
3706 hashcode = iterative_hash_object
3707 (TREE_INT_CST_LOW (TYPE_MAX_VALUE (ntype)), hashcode);
3708 hashcode = iterative_hash_object
3709 (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (ntype)), hashcode);
3712 case FIXED_POINT_TYPE:
3714 unsigned int precision = TYPE_PRECISION (ntype);
3715 hashcode = iterative_hash_object (precision, hashcode);
3722 ntype = type_hash_canon (hashcode, ntype);
3724 /* If the target-dependent attributes make NTYPE different from
3725 its canonical type, we will need to use structural equality
3726 checks for this type. */
3727 if (TYPE_STRUCTURAL_EQUALITY_P (ttype)
3728 || !targetm.comp_type_attributes (ntype, ttype))
3729 SET_TYPE_STRUCTURAL_EQUALITY (ntype);
3730 else if (TYPE_CANONICAL (ntype) == ntype)
3731 TYPE_CANONICAL (ntype) = TYPE_CANONICAL (ttype);
3733 ttype = build_qualified_type (ntype, quals);
3735 else if (TYPE_QUALS (ttype) != quals)
3736 ttype = build_qualified_type (ttype, quals);
3742 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
3745 Record such modified types already made so we don't make duplicates. */
3748 build_type_attribute_variant (tree ttype, tree attribute)
3750 return build_type_attribute_qual_variant (ttype, attribute,
3751 TYPE_QUALS (ttype));
3754 /* Return nonzero if IDENT is a valid name for attribute ATTR,
3757 We try both `text' and `__text__', ATTR may be either one. */
3758 /* ??? It might be a reasonable simplification to require ATTR to be only
3759 `text'. One might then also require attribute lists to be stored in
3760 their canonicalized form. */
3763 is_attribute_with_length_p (const char *attr, int attr_len, const_tree ident)
3768 if (TREE_CODE (ident) != IDENTIFIER_NODE)
3771 p = IDENTIFIER_POINTER (ident);
3772 ident_len = IDENTIFIER_LENGTH (ident);
3774 if (ident_len == attr_len
3775 && strcmp (attr, p) == 0)
3778 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
3781 gcc_assert (attr[1] == '_');
3782 gcc_assert (attr[attr_len - 2] == '_');
3783 gcc_assert (attr[attr_len - 1] == '_');
3784 if (ident_len == attr_len - 4
3785 && strncmp (attr + 2, p, attr_len - 4) == 0)
3790 if (ident_len == attr_len + 4
3791 && p[0] == '_' && p[1] == '_'
3792 && p[ident_len - 2] == '_' && p[ident_len - 1] == '_'
3793 && strncmp (attr, p + 2, attr_len) == 0)
3800 /* Return nonzero if IDENT is a valid name for attribute ATTR,
3803 We try both `text' and `__text__', ATTR may be either one. */
3806 is_attribute_p (const char *attr, const_tree ident)
3808 return is_attribute_with_length_p (attr, strlen (attr), ident);
3811 /* Given an attribute name and a list of attributes, return a pointer to the
3812 attribute's list element if the attribute is part of the list, or NULL_TREE
3813 if not found. If the attribute appears more than once, this only
3814 returns the first occurrence; the TREE_CHAIN of the return value should
3815 be passed back in if further occurrences are wanted. */
3818 lookup_attribute (const char *attr_name, tree list)
3821 size_t attr_len = strlen (attr_name);
3823 for (l = list; l; l = TREE_CHAIN (l))
3825 gcc_assert (TREE_CODE (TREE_PURPOSE (l)) == IDENTIFIER_NODE);
3826 if (is_attribute_with_length_p (attr_name, attr_len, TREE_PURPOSE (l)))
3832 /* Remove any instances of attribute ATTR_NAME in LIST and return the
3836 remove_attribute (const char *attr_name, tree list)
3839 size_t attr_len = strlen (attr_name);
3841 for (p = &list; *p; )
3844 gcc_assert (TREE_CODE (TREE_PURPOSE (l)) == IDENTIFIER_NODE);
3845 if (is_attribute_with_length_p (attr_name, attr_len, TREE_PURPOSE (l)))
3846 *p = TREE_CHAIN (l);
3848 p = &TREE_CHAIN (l);
3854 /* Return an attribute list that is the union of a1 and a2. */
3857 merge_attributes (tree a1, tree a2)
3861 /* Either one unset? Take the set one. */
3863 if ((attributes = a1) == 0)
3866 /* One that completely contains the other? Take it. */
3868 else if (a2 != 0 && ! attribute_list_contained (a1, a2))
3870 if (attribute_list_contained (a2, a1))
3874 /* Pick the longest list, and hang on the other list. */
3876 if (list_length (a1) < list_length (a2))
3877 attributes = a2, a2 = a1;
3879 for (; a2 != 0; a2 = TREE_CHAIN (a2))
3882 for (a = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)),
3885 a = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2)),
3888 if (TREE_VALUE (a) != NULL
3889 && TREE_CODE (TREE_VALUE (a)) == TREE_LIST
3890 && TREE_VALUE (a2) != NULL
3891 && TREE_CODE (TREE_VALUE (a2)) == TREE_LIST)
3893 if (simple_cst_list_equal (TREE_VALUE (a),
3894 TREE_VALUE (a2)) == 1)
3897 else if (simple_cst_equal (TREE_VALUE (a),
3898 TREE_VALUE (a2)) == 1)
3903 a1 = copy_node (a2);
3904 TREE_CHAIN (a1) = attributes;
3913 /* Given types T1 and T2, merge their attributes and return
3917 merge_type_attributes (tree t1, tree t2)
3919 return merge_attributes (TYPE_ATTRIBUTES (t1),
3920 TYPE_ATTRIBUTES (t2));
3923 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
3927 merge_decl_attributes (tree olddecl, tree newdecl)
3929 return merge_attributes (DECL_ATTRIBUTES (olddecl),
3930 DECL_ATTRIBUTES (newdecl));
3933 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
3935 /* Specialization of merge_decl_attributes for various Windows targets.
3937 This handles the following situation:
3939 __declspec (dllimport) int foo;
3942 The second instance of `foo' nullifies the dllimport. */
3945 merge_dllimport_decl_attributes (tree old, tree new_tree)
3948 int delete_dllimport_p = 1;
3950 /* What we need to do here is remove from `old' dllimport if it doesn't
3951 appear in `new'. dllimport behaves like extern: if a declaration is
3952 marked dllimport and a definition appears later, then the object
3953 is not dllimport'd. We also remove a `new' dllimport if the old list
3954 contains dllexport: dllexport always overrides dllimport, regardless
3955 of the order of declaration. */
3956 if (!VAR_OR_FUNCTION_DECL_P (new_tree))
3957 delete_dllimport_p = 0;
3958 else if (DECL_DLLIMPORT_P (new_tree)
3959 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (old)))
3961 DECL_DLLIMPORT_P (new_tree) = 0;
3962 warning (OPT_Wattributes, "%q+D already declared with dllexport attribute: "
3963 "dllimport ignored", new_tree);
3965 else if (DECL_DLLIMPORT_P (old) && !DECL_DLLIMPORT_P (new_tree))
3967 /* Warn about overriding a symbol that has already been used, e.g.:
3968 extern int __attribute__ ((dllimport)) foo;
3969 int* bar () {return &foo;}
3972 if (TREE_USED (old))
3974 warning (0, "%q+D redeclared without dllimport attribute "
3975 "after being referenced with dll linkage", new_tree);
3976 /* If we have used a variable's address with dllimport linkage,
3977 keep the old DECL_DLLIMPORT_P flag: the ADDR_EXPR using the
3978 decl may already have had TREE_CONSTANT computed.
3979 We still remove the attribute so that assembler code refers
3980 to '&foo rather than '_imp__foo'. */
3981 if (TREE_CODE (old) == VAR_DECL && TREE_ADDRESSABLE (old))
3982 DECL_DLLIMPORT_P (new_tree) = 1;
3985 /* Let an inline definition silently override the external reference,
3986 but otherwise warn about attribute inconsistency. */
3987 else if (TREE_CODE (new_tree) == VAR_DECL
3988 || !DECL_DECLARED_INLINE_P (new_tree))
3989 warning (OPT_Wattributes, "%q+D redeclared without dllimport attribute: "
3990 "previous dllimport ignored", new_tree);
3993 delete_dllimport_p = 0;
3995 a = merge_attributes (DECL_ATTRIBUTES (old), DECL_ATTRIBUTES (new_tree));
3997 if (delete_dllimport_p)
4000 const size_t attr_len = strlen ("dllimport");
4002 /* Scan the list for dllimport and delete it. */
4003 for (prev = NULL_TREE, t = a; t; prev = t, t = TREE_CHAIN (t))
4005 if (is_attribute_with_length_p ("dllimport", attr_len,
4008 if (prev == NULL_TREE)
4011 TREE_CHAIN (prev) = TREE_CHAIN (t);
4020 /* Handle a "dllimport" or "dllexport" attribute; arguments as in
4021 struct attribute_spec.handler. */
4024 handle_dll_attribute (tree * pnode, tree name, tree args, int flags,
4029 /* These attributes may apply to structure and union types being created,
4030 but otherwise should pass to the declaration involved. */
4033 if (flags & ((int) ATTR_FLAG_DECL_NEXT | (int) ATTR_FLAG_FUNCTION_NEXT
4034 | (int) ATTR_FLAG_ARRAY_NEXT))
4036 *no_add_attrs = true;
4037 return tree_cons (name, args, NULL_TREE);
4039 if (TREE_CODE (node) == RECORD_TYPE
4040 || TREE_CODE (node) == UNION_TYPE)
4042 node = TYPE_NAME (node);
4048 warning (OPT_Wattributes, "%qE attribute ignored",
4050 *no_add_attrs = true;
4055 if (TREE_CODE (node) != FUNCTION_DECL
4056 && TREE_CODE (node) != VAR_DECL
4057 && TREE_CODE (node) != TYPE_DECL)
4059 *no_add_attrs = true;
4060 warning (OPT_Wattributes, "%qE attribute ignored",
4065 if (TREE_CODE (node) == TYPE_DECL
4066 && TREE_CODE (TREE_TYPE (node)) != RECORD_TYPE
4067 && TREE_CODE (TREE_TYPE (node)) != UNION_TYPE)
4069 *no_add_attrs = true;
4070 warning (OPT_Wattributes, "%qE attribute ignored",
4075 /* Report error on dllimport ambiguities seen now before they cause
4077 else if (is_attribute_p ("dllimport", name))
4079 /* Honor any target-specific overrides. */
4080 if (!targetm.valid_dllimport_attribute_p (node))
4081 *no_add_attrs = true;
4083 else if (TREE_CODE (node) == FUNCTION_DECL
4084 && DECL_DECLARED_INLINE_P (node))
4086 warning (OPT_Wattributes, "inline function %q+D declared as "
4087 " dllimport: attribute ignored", node);
4088 *no_add_attrs = true;
4090 /* Like MS, treat definition of dllimported variables and
4091 non-inlined functions on declaration as syntax errors. */
4092 else if (TREE_CODE (node) == FUNCTION_DECL && DECL_INITIAL (node))
4094 error ("function %q+D definition is marked dllimport", node);
4095 *no_add_attrs = true;
4098 else if (TREE_CODE (node) == VAR_DECL)
4100 if (DECL_INITIAL (node))
4102 error ("variable %q+D definition is marked dllimport",
4104 *no_add_attrs = true;
4107 /* `extern' needn't be specified with dllimport.
4108 Specify `extern' now and hope for the best. Sigh. */
4109 DECL_EXTERNAL (node) = 1;
4110 /* Also, implicitly give dllimport'd variables declared within
4111 a function global scope, unless declared static. */
4112 if (current_function_decl != NULL_TREE && !TREE_STATIC (node))
4113 TREE_PUBLIC (node) = 1;
4116 if (*no_add_attrs == false)
4117 DECL_DLLIMPORT_P (node) = 1;
4120 /* Report error if symbol is not accessible at global scope. */
4121 if (!TREE_PUBLIC (node)
4122 && (TREE_CODE (node) == VAR_DECL
4123 || TREE_CODE (node) == FUNCTION_DECL))
4125 error ("external linkage required for symbol %q+D because of "
4126 "%qE attribute", node, name);
4127 *no_add_attrs = true;
4130 /* A dllexport'd entity must have default visibility so that other
4131 program units (shared libraries or the main executable) can see
4132 it. A dllimport'd entity must have default visibility so that
4133 the linker knows that undefined references within this program
4134 unit can be resolved by the dynamic linker. */
4137 if (DECL_VISIBILITY_SPECIFIED (node)
4138 && DECL_VISIBILITY (node) != VISIBILITY_DEFAULT)
4139 error ("%qE implies default visibility, but %qD has already "
4140 "been declared with a different visibility",
4142 DECL_VISIBILITY (node) = VISIBILITY_DEFAULT;
4143 DECL_VISIBILITY_SPECIFIED (node) = 1;
4149 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
4151 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
4152 of the various TYPE_QUAL values. */
4155 set_type_quals (tree type, int type_quals)
4157 TYPE_READONLY (type) = (type_quals & TYPE_QUAL_CONST) != 0;
4158 TYPE_VOLATILE (type) = (type_quals & TYPE_QUAL_VOLATILE) != 0;
4159 TYPE_RESTRICT (type) = (type_quals & TYPE_QUAL_RESTRICT) != 0;
4162 /* Returns true iff CAND is equivalent to BASE with TYPE_QUALS. */
4165 check_qualified_type (const_tree cand, const_tree base, int type_quals)
4167 return (TYPE_QUALS (cand) == type_quals
4168 && TYPE_NAME (cand) == TYPE_NAME (base)
4169 /* Apparently this is needed for Objective-C. */
4170 && TYPE_CONTEXT (cand) == TYPE_CONTEXT (base)
4171 && attribute_list_equal (TYPE_ATTRIBUTES (cand),
4172 TYPE_ATTRIBUTES (base)));
4175 /* Return a version of the TYPE, qualified as indicated by the
4176 TYPE_QUALS, if one exists. If no qualified version exists yet,
4177 return NULL_TREE. */
4180 get_qualified_type (tree type, int type_quals)
4184 if (TYPE_QUALS (type) == type_quals)
4187 /* Search the chain of variants to see if there is already one there just
4188 like the one we need to have. If so, use that existing one. We must
4189 preserve the TYPE_NAME, since there is code that depends on this. */
4190 for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
4191 if (check_qualified_type (t, type, type_quals))
4197 /* Like get_qualified_type, but creates the type if it does not
4198 exist. This function never returns NULL_TREE. */
4201 build_qualified_type (tree type, int type_quals)
4205 /* See if we already have the appropriate qualified variant. */
4206 t = get_qualified_type (type, type_quals);
4208 /* If not, build it. */
4211 t = build_variant_type_copy (type);
4212 set_type_quals (t, type_quals);
4214 if (TYPE_STRUCTURAL_EQUALITY_P (type))
4215 /* Propagate structural equality. */
4216 SET_TYPE_STRUCTURAL_EQUALITY (t);
4217 else if (TYPE_CANONICAL (type) != type)
4218 /* Build the underlying canonical type, since it is different
4220 TYPE_CANONICAL (t) = build_qualified_type (TYPE_CANONICAL (type),
4223 /* T is its own canonical type. */
4224 TYPE_CANONICAL (t) = t;
4231 /* Create a new distinct copy of TYPE. The new type is made its own
4232 MAIN_VARIANT. If TYPE requires structural equality checks, the
4233 resulting type requires structural equality checks; otherwise, its
4234 TYPE_CANONICAL points to itself. */
4237 build_distinct_type_copy (tree type)
4239 tree t = copy_node (type);
4241 TYPE_POINTER_TO (t) = 0;
4242 TYPE_REFERENCE_TO (t) = 0;
4244 /* Set the canonical type either to a new equivalence class, or
4245 propagate the need for structural equality checks. */
4246 if (TYPE_STRUCTURAL_EQUALITY_P (type))
4247 SET_TYPE_STRUCTURAL_EQUALITY (t);
4249 TYPE_CANONICAL (t) = t;
4251 /* Make it its own variant. */
4252 TYPE_MAIN_VARIANT (t) = t;
4253 TYPE_NEXT_VARIANT (t) = 0;
4255 /* Note that it is now possible for TYPE_MIN_VALUE to be a value
4256 whose TREE_TYPE is not t. This can also happen in the Ada
4257 frontend when using subtypes. */
4262 /* Create a new variant of TYPE, equivalent but distinct. This is so
4263 the caller can modify it. TYPE_CANONICAL for the return type will
4264 be equivalent to TYPE_CANONICAL of TYPE, indicating that the types
4265 are considered equal by the language itself (or that both types
4266 require structural equality checks). */
4269 build_variant_type_copy (tree type)
4271 tree t, m = TYPE_MAIN_VARIANT (type);
4273 t = build_distinct_type_copy (type);
4275 /* Since we're building a variant, assume that it is a non-semantic
4276 variant. This also propagates TYPE_STRUCTURAL_EQUALITY_P. */
4277 TYPE_CANONICAL (t) = TYPE_CANONICAL (type);
4279 /* Add the new type to the chain of variants of TYPE. */
4280 TYPE_NEXT_VARIANT (t) = TYPE_NEXT_VARIANT (m);
4281 TYPE_NEXT_VARIANT (m) = t;
4282 TYPE_MAIN_VARIANT (t) = m;
4287 /* Return true if the from tree in both tree maps are equal. */
4290 tree_map_base_eq (const void *va, const void *vb)
4292 const struct tree_map_base *const a = (const struct tree_map_base *) va,
4293 *const b = (const struct tree_map_base *) vb;
4294 return (a->from == b->from);
4297 /* Hash a from tree in a tree_map. */
4300 tree_map_base_hash (const void *item)
4302 return htab_hash_pointer (((const struct tree_map_base *)item)->from);
4305 /* Return true if this tree map structure is marked for garbage collection
4306 purposes. We simply return true if the from tree is marked, so that this
4307 structure goes away when the from tree goes away. */
4310 tree_map_base_marked_p (const void *p)
4312 return ggc_marked_p (((const struct tree_map_base *) p)->from);
4316 tree_map_hash (const void *item)
4318 return (((const struct tree_map *) item)->hash);
4321 /* Return the initialization priority for DECL. */
4324 decl_init_priority_lookup (tree decl)
4326 struct tree_priority_map *h;
4327 struct tree_map_base in;
4329 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
4331 h = (struct tree_priority_map *) htab_find (init_priority_for_decl, &in);
4332 return h ? h->init : DEFAULT_INIT_PRIORITY;
4335 /* Return the finalization priority for DECL. */
4338 decl_fini_priority_lookup (tree decl)
4340 struct tree_priority_map *h;
4341 struct tree_map_base in;
4343 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
4345 h = (struct tree_priority_map *) htab_find (init_priority_for_decl, &in);
4346 return h ? h->fini : DEFAULT_INIT_PRIORITY;
4349 /* Return the initialization and finalization priority information for
4350 DECL. If there is no previous priority information, a freshly
4351 allocated structure is returned. */
4353 static struct tree_priority_map *
4354 decl_priority_info (tree decl)
4356 struct tree_priority_map in;
4357 struct tree_priority_map *h;
4360 in.base.from = decl;
4361 loc = htab_find_slot (init_priority_for_decl, &in, INSERT);
4362 h = (struct tree_priority_map *) *loc;
4365 h = GGC_CNEW (struct tree_priority_map);
4367 h->base.from = decl;
4368 h->init = DEFAULT_INIT_PRIORITY;
4369 h->fini = DEFAULT_INIT_PRIORITY;
4375 /* Set the initialization priority for DECL to PRIORITY. */
4378 decl_init_priority_insert (tree decl, priority_type priority)
4380 struct tree_priority_map *h;
4382 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
4383 h = decl_priority_info (decl);
4387 /* Set the finalization priority for DECL to PRIORITY. */
4390 decl_fini_priority_insert (tree decl, priority_type priority)
4392 struct tree_priority_map *h;
4394 gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);
4395 h = decl_priority_info (decl);
4399 /* Look up a restrict qualified base decl for FROM. */
4402 decl_restrict_base_lookup (tree from)
4407 in.base.from = from;
4408 h = (struct tree_map *) htab_find_with_hash (restrict_base_for_decl, &in,
4409 htab_hash_pointer (from));
4410 return h ? h->to : NULL_TREE;
4413 /* Record the restrict qualified base TO for FROM. */
4416 decl_restrict_base_insert (tree from, tree to)
4421 h = GGC_NEW (struct tree_map);
4422 h->hash = htab_hash_pointer (from);
4423 h->base.from = from;
4425 loc = htab_find_slot_with_hash (restrict_base_for_decl, h, h->hash, INSERT);
4426 *(struct tree_map **) loc = h;
4429 /* Print out the statistics for the DECL_DEBUG_EXPR hash table. */
4432 print_debug_expr_statistics (void)
4434 fprintf (stderr, "DECL_DEBUG_EXPR hash: size %ld, %ld elements, %f collisions\n",
4435 (long) htab_size (debug_expr_for_decl),
4436 (long) htab_elements (debug_expr_for_decl),
4437 htab_collisions (debug_expr_for_decl));
4440 /* Print out the statistics for the DECL_VALUE_EXPR hash table. */
4443 print_value_expr_statistics (void)
4445 fprintf (stderr, "DECL_VALUE_EXPR hash: size %ld, %ld elements, %f collisions\n",
4446 (long) htab_size (value_expr_for_decl),
4447 (long) htab_elements (value_expr_for_decl),
4448 htab_collisions (value_expr_for_decl));
4451 /* Print out statistics for the RESTRICT_BASE_FOR_DECL hash table, but
4452 don't print anything if the table is empty. */
4455 print_restrict_base_statistics (void)
4457 if (htab_elements (restrict_base_for_decl) != 0)
4459 "RESTRICT_BASE hash: size %ld, %ld elements, %f collisions\n",
4460 (long) htab_size (restrict_base_for_decl),
4461 (long) htab_elements (restrict_base_for_decl),
4462 htab_collisions (restrict_base_for_decl));
4465 /* Lookup a debug expression for FROM, and return it if we find one. */
4468 decl_debug_expr_lookup (tree from)
4470 struct tree_map *h, in;
4471 in.base.from = from;
4473 h = (struct tree_map *) htab_find_with_hash (debug_expr_for_decl, &in,
4474 htab_hash_pointer (from));
4480 /* Insert a mapping FROM->TO in the debug expression hashtable. */
4483 decl_debug_expr_insert (tree from, tree to)
4488 h = GGC_NEW (struct tree_map);
4489 h->hash = htab_hash_pointer (from);
4490 h->base.from = from;
4492 loc = htab_find_slot_with_hash (debug_expr_for_decl, h, h->hash, INSERT);
4493 *(struct tree_map **) loc = h;
4496 /* Lookup a value expression for FROM, and return it if we find one. */
4499 decl_value_expr_lookup (tree from)
4501 struct tree_map *h, in;
4502 in.base.from = from;
4504 h = (struct tree_map *) htab_find_with_hash (value_expr_for_decl, &in,
4505 htab_hash_pointer (from));
4511 /* Insert a mapping FROM->TO in the value expression hashtable. */
4514 decl_value_expr_insert (tree from, tree to)
4519 h = GGC_NEW (struct tree_map);
4520 h->hash = htab_hash_pointer (from);
4521 h->base.from = from;
4523 loc = htab_find_slot_with_hash (value_expr_for_decl, h, h->hash, INSERT);
4524 *(struct tree_map **) loc = h;
4527 /* Hashing of types so that we don't make duplicates.
4528 The entry point is `type_hash_canon'. */
4530 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
4531 with types in the TREE_VALUE slots), by adding the hash codes
4532 of the individual types. */
4535 type_hash_list (const_tree list, hashval_t hashcode)
4539 for (tail = list; tail; tail = TREE_CHAIN (tail))
4540 if (TREE_VALUE (tail) != error_mark_node)
4541 hashcode = iterative_hash_object (TYPE_HASH (TREE_VALUE (tail)),
4547 /* These are the Hashtable callback functions. */
4549 /* Returns true iff the types are equivalent. */
4552 type_hash_eq (const void *va, const void *vb)
4554 const struct type_hash *const a = (const struct type_hash *) va,
4555 *const b = (const struct type_hash *) vb;
4557 /* First test the things that are the same for all types. */
4558 if (a->hash != b->hash
4559 || TREE_CODE (a->type) != TREE_CODE (b->type)
4560 || TREE_TYPE (a->type) != TREE_TYPE (b->type)
4561 || !attribute_list_equal (TYPE_ATTRIBUTES (a->type),
4562 TYPE_ATTRIBUTES (b->type))
4563 || TYPE_ALIGN (a->type) != TYPE_ALIGN (b->type)
4564 || TYPE_MODE (a->type) != TYPE_MODE (b->type)
4565 || (TREE_CODE (a->type) != COMPLEX_TYPE
4566 && TYPE_NAME (a->type) != TYPE_NAME (b->type)))
4569 switch (TREE_CODE (a->type))
4574 case REFERENCE_TYPE:
4578 return TYPE_VECTOR_SUBPARTS (a->type) == TYPE_VECTOR_SUBPARTS (b->type);
4581 if (TYPE_VALUES (a->type) != TYPE_VALUES (b->type)
4582 && !(TYPE_VALUES (a->type)
4583 && TREE_CODE (TYPE_VALUES (a->type)) == TREE_LIST
4584 && TYPE_VALUES (b->type)
4585 && TREE_CODE (TYPE_VALUES (b->type)) == TREE_LIST
4586 && type_list_equal (TYPE_VALUES (a->type),
4587 TYPE_VALUES (b->type))))
4590 /* ... fall through ... */
4595 return ((TYPE_MAX_VALUE (a->type) == TYPE_MAX_VALUE (b->type)
4596 || tree_int_cst_equal (TYPE_MAX_VALUE (a->type),
4597 TYPE_MAX_VALUE (b->type)))
4598 && (TYPE_MIN_VALUE (a->type) == TYPE_MIN_VALUE (b->type)
4599 || tree_int_cst_equal (TYPE_MIN_VALUE (a->type),
4600 TYPE_MIN_VALUE (b->type))));
4602 case FIXED_POINT_TYPE:
4603 return TYPE_SATURATING (a->type) == TYPE_SATURATING (b->type);
4606 return TYPE_OFFSET_BASETYPE (a->type) == TYPE_OFFSET_BASETYPE (b->type);
4609 return (TYPE_METHOD_BASETYPE (a->type) == TYPE_METHOD_BASETYPE (b->type)
4610 && (TYPE_ARG_TYPES (a->type) == TYPE_ARG_TYPES (b->type)
4611 || (TYPE_ARG_TYPES (a->type)
4612 && TREE_CODE (TYPE_ARG_TYPES (a->type)) == TREE_LIST
4613 && TYPE_ARG_TYPES (b->type)
4614 && TREE_CODE (TYPE_ARG_TYPES (b->type)) == TREE_LIST
4615 && type_list_equal (TYPE_ARG_TYPES (a->type),
4616 TYPE_ARG_TYPES (b->type)))));
4619 return TYPE_DOMAIN (a->type) == TYPE_DOMAIN (b->type);
4623 case QUAL_UNION_TYPE:
4624 return (TYPE_FIELDS (a->type) == TYPE_FIELDS (b->type)
4625 || (TYPE_FIELDS (a->type)
4626 && TREE_CODE (TYPE_FIELDS (a->type)) == TREE_LIST
4627 && TYPE_FIELDS (b->type)
4628 && TREE_CODE (TYPE_FIELDS (b->type)) == TREE_LIST
4629 && type_list_equal (TYPE_FIELDS (a->type),
4630 TYPE_FIELDS (b->type))));
4633 if (TYPE_ARG_TYPES (a->type) == TYPE_ARG_TYPES (b->type)
4634 || (TYPE_ARG_TYPES (a->type)
4635 && TREE_CODE (TYPE_ARG_TYPES (a->type)) == TREE_LIST
4636 && TYPE_ARG_TYPES (b->type)
4637 && TREE_CODE (TYPE_ARG_TYPES (b->type)) == TREE_LIST
4638 && type_list_equal (TYPE_ARG_TYPES (a->type),
4639 TYPE_ARG_TYPES (b->type))))
4647 if (lang_hooks.types.type_hash_eq != NULL)
4648 return lang_hooks.types.type_hash_eq (a->type, b->type);
4653 /* Return the cached hash value. */
4656 type_hash_hash (const void *item)
4658 return ((const struct type_hash *) item)->hash;
4661 /* Look in the type hash table for a type isomorphic to TYPE.
4662 If one is found, return it. Otherwise return 0. */
4665 type_hash_lookup (hashval_t hashcode, tree type)
4667 struct type_hash *h, in;
4669 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
4670 must call that routine before comparing TYPE_ALIGNs. */
4676 h = (struct type_hash *) htab_find_with_hash (type_hash_table, &in,
4683 /* Add an entry to the type-hash-table
4684 for a type TYPE whose hash code is HASHCODE. */
4687 type_hash_add (hashval_t hashcode, tree type)
4689 struct type_hash *h;
4692 h = GGC_NEW (struct type_hash);
4695 loc = htab_find_slot_with_hash (type_hash_table, h, hashcode, INSERT);
4699 /* Given TYPE, and HASHCODE its hash code, return the canonical
4700 object for an identical type if one already exists.
4701 Otherwise, return TYPE, and record it as the canonical object.
4703 To use this function, first create a type of the sort you want.
4704 Then compute its hash code from the fields of the type that
4705 make it different from other similar types.
4706 Then call this function and use the value. */
4709 type_hash_canon (unsigned int hashcode, tree type)
4713 /* The hash table only contains main variants, so ensure that's what we're
4715 gcc_assert (TYPE_MAIN_VARIANT (type) == type);
4717 if (!lang_hooks.types.hash_types)
4720 /* See if the type is in the hash table already. If so, return it.
4721 Otherwise, add the type. */
4722 t1 = type_hash_lookup (hashcode, type);
4725 #ifdef GATHER_STATISTICS
4726 tree_node_counts[(int) t_kind]--;
4727 tree_node_sizes[(int) t_kind] -= sizeof (struct tree_type);
4733 type_hash_add (hashcode, type);
4738 /* See if the data pointed to by the type hash table is marked. We consider
4739 it marked if the type is marked or if a debug type number or symbol
4740 table entry has been made for the type. This reduces the amount of
4741 debugging output and eliminates that dependency of the debug output on
4742 the number of garbage collections. */
4745 type_hash_marked_p (const void *p)
4747 const_tree const type = ((const struct type_hash *) p)->type;
4749 return ggc_marked_p (type) || TYPE_SYMTAB_POINTER (type);
4753 print_type_hash_statistics (void)
4755 fprintf (stderr, "Type hash: size %ld, %ld elements, %f collisions\n",
4756 (long) htab_size (type_hash_table),
4757 (long) htab_elements (type_hash_table),
4758 htab_collisions (type_hash_table));
4761 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
4762 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
4763 by adding the hash codes of the individual attributes. */
4766 attribute_hash_list (const_tree list, hashval_t hashcode)
4770 for (tail = list; tail; tail = TREE_CHAIN (tail))
4771 /* ??? Do we want to add in TREE_VALUE too? */
4772 hashcode = iterative_hash_object
4773 (IDENTIFIER_HASH_VALUE (TREE_PURPOSE (tail)), hashcode);
4777 /* Given two lists of attributes, return true if list l2 is
4778 equivalent to l1. */
4781 attribute_list_equal (const_tree l1, const_tree l2)
4783 return attribute_list_contained (l1, l2)
4784 && attribute_list_contained (l2, l1);
4787 /* Given two lists of attributes, return true if list L2 is
4788 completely contained within L1. */
4789 /* ??? This would be faster if attribute names were stored in a canonicalized
4790 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
4791 must be used to show these elements are equivalent (which they are). */
4792 /* ??? It's not clear that attributes with arguments will always be handled
4796 attribute_list_contained (const_tree l1, const_tree l2)
4800 /* First check the obvious, maybe the lists are identical. */
4804 /* Maybe the lists are similar. */
4805 for (t1 = l1, t2 = l2;
4807 && TREE_PURPOSE (t1) == TREE_PURPOSE (t2)
4808 && TREE_VALUE (t1) == TREE_VALUE (t2);
4809 t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2));
4811 /* Maybe the lists are equal. */
4812 if (t1 == 0 && t2 == 0)
4815 for (; t2 != 0; t2 = TREE_CHAIN (t2))
4818 /* This CONST_CAST is okay because lookup_attribute does not
4819 modify its argument and the return value is assigned to a
4821 for (attr = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)),
4822 CONST_CAST_TREE(l1));
4824 attr = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2)),
4827 if (TREE_VALUE (t2) != NULL
4828 && TREE_CODE (TREE_VALUE (t2)) == TREE_LIST
4829 && TREE_VALUE (attr) != NULL
4830 && TREE_CODE (TREE_VALUE (attr)) == TREE_LIST)
4832 if (simple_cst_list_equal (TREE_VALUE (t2),
4833 TREE_VALUE (attr)) == 1)
4836 else if (simple_cst_equal (TREE_VALUE (t2), TREE_VALUE (attr)) == 1)
4847 /* Given two lists of types
4848 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
4849 return 1 if the lists contain the same types in the same order.
4850 Also, the TREE_PURPOSEs must match. */
4853 type_list_equal (const_tree l1, const_tree l2)
4857 for (t1 = l1, t2 = l2; t1 && t2; t1 = TREE_CHAIN (t1), t2 = TREE_CHAIN (t2))
4858 if (TREE_VALUE (t1) != TREE_VALUE (t2)
4859 || (TREE_PURPOSE (t1) != TREE_PURPOSE (t2)
4860 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1), TREE_PURPOSE (t2))
4861 && (TREE_TYPE (TREE_PURPOSE (t1))
4862 == TREE_TYPE (TREE_PURPOSE (t2))))))
4868 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
4869 given by TYPE. If the argument list accepts variable arguments,
4870 then this function counts only the ordinary arguments. */
4873 type_num_arguments (const_tree type)
4878 for (t = TYPE_ARG_TYPES (type); t; t = TREE_CHAIN (t))
4879 /* If the function does not take a variable number of arguments,
4880 the last element in the list will have type `void'. */
4881 if (VOID_TYPE_P (TREE_VALUE (t)))
4889 /* Nonzero if integer constants T1 and T2
4890 represent the same constant value. */
4893 tree_int_cst_equal (const_tree t1, const_tree t2)
4898 if (t1 == 0 || t2 == 0)
4901 if (TREE_CODE (t1) == INTEGER_CST
4902 && TREE_CODE (t2) == INTEGER_CST
4903 && TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
4904 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2))
4910 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
4911 The precise way of comparison depends on their data type. */
4914 tree_int_cst_lt (const_tree t1, const_tree t2)
4919 if (TYPE_UNSIGNED (TREE_TYPE (t1)) != TYPE_UNSIGNED (TREE_TYPE (t2)))
4921 int t1_sgn = tree_int_cst_sgn (t1);
4922 int t2_sgn = tree_int_cst_sgn (t2);
4924 if (t1_sgn < t2_sgn)
4926 else if (t1_sgn > t2_sgn)
4928 /* Otherwise, both are non-negative, so we compare them as
4929 unsigned just in case one of them would overflow a signed
4932 else if (!TYPE_UNSIGNED (TREE_TYPE (t1)))
4933 return INT_CST_LT (t1, t2);
4935 return INT_CST_LT_UNSIGNED (t1, t2);
4938 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
4941 tree_int_cst_compare (const_tree t1, const_tree t2)
4943 if (tree_int_cst_lt (t1, t2))
4945 else if (tree_int_cst_lt (t2, t1))
4951 /* Return 1 if T is an INTEGER_CST that can be manipulated efficiently on
4952 the host. If POS is zero, the value can be represented in a single
4953 HOST_WIDE_INT. If POS is nonzero, the value must be non-negative and can
4954 be represented in a single unsigned HOST_WIDE_INT. */
4957 host_integerp (const_tree t, int pos)
4959 return (TREE_CODE (t) == INTEGER_CST
4960 && ((TREE_INT_CST_HIGH (t) == 0
4961 && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) >= 0)
4962 || (! pos && TREE_INT_CST_HIGH (t) == -1
4963 && (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0
4964 && (!TYPE_UNSIGNED (TREE_TYPE (t))
4965 || (TREE_CODE (TREE_TYPE (t)) == INTEGER_TYPE
4966 && TYPE_IS_SIZETYPE (TREE_TYPE (t)))))
4967 || (pos && TREE_INT_CST_HIGH (t) == 0)));
4970 /* Return the HOST_WIDE_INT least significant bits of T if it is an
4971 INTEGER_CST and there is no overflow. POS is nonzero if the result must
4972 be non-negative. We must be able to satisfy the above conditions. */
4975 tree_low_cst (const_tree t, int pos)
4977 gcc_assert (host_integerp (t, pos));
4978 return TREE_INT_CST_LOW (t);
4981 /* Return the most significant bit of the integer constant T. */
4984 tree_int_cst_msb (const_tree t)
4988 unsigned HOST_WIDE_INT l;
4990 /* Note that using TYPE_PRECISION here is wrong. We care about the
4991 actual bits, not the (arbitrary) range of the type. */
4992 prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t))) - 1;
4993 rshift_double (TREE_INT_CST_LOW (t), TREE_INT_CST_HIGH (t), prec,
4994 2 * HOST_BITS_PER_WIDE_INT, &l, &h, 0);
4995 return (l & 1) == 1;
4998 /* Return an indication of the sign of the integer constant T.
4999 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
5000 Note that -1 will never be returned if T's type is unsigned. */
5003 tree_int_cst_sgn (const_tree t)
5005 if (TREE_INT_CST_LOW (t) == 0 && TREE_INT_CST_HIGH (t) == 0)
5007 else if (TYPE_UNSIGNED (TREE_TYPE (t)))
5009 else if (TREE_INT_CST_HIGH (t) < 0)
5015 /* Return the minimum number of bits needed to represent VALUE in a
5016 signed or unsigned type, UNSIGNEDP says which. */
5019 tree_int_cst_min_precision (tree value, bool unsignedp)
5023 /* If the value is negative, compute its negative minus 1. The latter
5024 adjustment is because the absolute value of the largest negative value
5025 is one larger than the largest positive value. This is equivalent to
5026 a bit-wise negation, so use that operation instead. */
5028 if (tree_int_cst_sgn (value) < 0)
5029 value = fold_build1 (BIT_NOT_EXPR, TREE_TYPE (value), value);
5031 /* Return the number of bits needed, taking into account the fact
5032 that we need one more bit for a signed than unsigned type. */
5034 if (integer_zerop (value))
5037 log = tree_floor_log2 (value);
5039 return log + 1 + !unsignedp;
5042 /* Compare two constructor-element-type constants. Return 1 if the lists
5043 are known to be equal; otherwise return 0. */
5046 simple_cst_list_equal (const_tree l1, const_tree l2)
5048 while (l1 != NULL_TREE && l2 != NULL_TREE)
5050 if (simple_cst_equal (TREE_VALUE (l1), TREE_VALUE (l2)) != 1)
5053 l1 = TREE_CHAIN (l1);
5054 l2 = TREE_CHAIN (l2);
5060 /* Return truthvalue of whether T1 is the same tree structure as T2.
5061 Return 1 if they are the same.
5062 Return 0 if they are understandably different.
5063 Return -1 if either contains tree structure not understood by
5067 simple_cst_equal (const_tree t1, const_tree t2)
5069 enum tree_code code1, code2;
5075 if (t1 == 0 || t2 == 0)
5078 code1 = TREE_CODE (t1);
5079 code2 = TREE_CODE (t2);
5081 if (CONVERT_EXPR_CODE_P (code1) || code1 == NON_LVALUE_EXPR)
5083 if (CONVERT_EXPR_CODE_P (code2)
5084 || code2 == NON_LVALUE_EXPR)
5085 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
5087 return simple_cst_equal (TREE_OPERAND (t1, 0), t2);
5090 else if (CONVERT_EXPR_CODE_P (code2)
5091 || code2 == NON_LVALUE_EXPR)
5092 return simple_cst_equal (t1, TREE_OPERAND (t2, 0));
5100 return (TREE_INT_CST_LOW (t1) == TREE_INT_CST_LOW (t2)
5101 && TREE_INT_CST_HIGH (t1) == TREE_INT_CST_HIGH (t2));
5104 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1), TREE_REAL_CST (t2));
5107 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));
5110 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
5111 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
5112 TREE_STRING_LENGTH (t1)));
5116 unsigned HOST_WIDE_INT idx;
5117 VEC(constructor_elt, gc) *v1 = CONSTRUCTOR_ELTS (t1);
5118 VEC(constructor_elt, gc) *v2 = CONSTRUCTOR_ELTS (t2);
5120 if (VEC_length (constructor_elt, v1) != VEC_length (constructor_elt, v2))
5123 for (idx = 0; idx < VEC_length (constructor_elt, v1); ++idx)
5124 /* ??? Should we handle also fields here? */
5125 if (!simple_cst_equal (VEC_index (constructor_elt, v1, idx)->value,
5126 VEC_index (constructor_elt, v2, idx)->value))
5132 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
5135 cmp = simple_cst_equal (CALL_EXPR_FN (t1), CALL_EXPR_FN (t2));
5138 if (call_expr_nargs (t1) != call_expr_nargs (t2))
5141 const_tree arg1, arg2;
5142 const_call_expr_arg_iterator iter1, iter2;
5143 for (arg1 = first_const_call_expr_arg (t1, &iter1),
5144 arg2 = first_const_call_expr_arg (t2, &iter2);
5146 arg1 = next_const_call_expr_arg (&iter1),
5147 arg2 = next_const_call_expr_arg (&iter2))
5149 cmp = simple_cst_equal (arg1, arg2);
5153 return arg1 == arg2;
5157 /* Special case: if either target is an unallocated VAR_DECL,
5158 it means that it's going to be unified with whatever the
5159 TARGET_EXPR is really supposed to initialize, so treat it
5160 as being equivalent to anything. */
5161 if ((TREE_CODE (TREE_OPERAND (t1, 0)) == VAR_DECL
5162 && DECL_NAME (TREE_OPERAND (t1, 0)) == NULL_TREE
5163 && !DECL_RTL_SET_P (TREE_OPERAND (t1, 0)))
5164 || (TREE_CODE (TREE_OPERAND (t2, 0)) == VAR_DECL
5165 && DECL_NAME (TREE_OPERAND (t2, 0)) == NULL_TREE
5166 && !DECL_RTL_SET_P (TREE_OPERAND (t2, 0))))
5169 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
5174 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1));
5176 case WITH_CLEANUP_EXPR:
5177 cmp = simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
5181 return simple_cst_equal (TREE_OPERAND (t1, 1), TREE_OPERAND (t1, 1));
5184 if (TREE_OPERAND (t1, 1) == TREE_OPERAND (t2, 1))
5185 return simple_cst_equal (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
5199 /* This general rule works for most tree codes. All exceptions should be
5200 handled above. If this is a language-specific tree code, we can't
5201 trust what might be in the operand, so say we don't know
5203 if ((int) code1 >= (int) LAST_AND_UNUSED_TREE_CODE)
5206 switch (TREE_CODE_CLASS (code1))
5210 case tcc_comparison:
5211 case tcc_expression:
5215 for (i = 0; i < TREE_CODE_LENGTH (code1); i++)
5217 cmp = simple_cst_equal (TREE_OPERAND (t1, i), TREE_OPERAND (t2, i));
5229 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
5230 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
5231 than U, respectively. */
5234 compare_tree_int (const_tree t, unsigned HOST_WIDE_INT u)
5236 if (tree_int_cst_sgn (t) < 0)
5238 else if (TREE_INT_CST_HIGH (t) != 0)
5240 else if (TREE_INT_CST_LOW (t) == u)
5242 else if (TREE_INT_CST_LOW (t) < u)
5248 /* Return true if CODE represents an associative tree code. Otherwise
5251 associative_tree_code (enum tree_code code)
5270 /* Return true if CODE represents a commutative tree code. Otherwise
5273 commutative_tree_code (enum tree_code code)
5286 case UNORDERED_EXPR:
5290 case TRUTH_AND_EXPR:
5291 case TRUTH_XOR_EXPR:
5301 /* Generate a hash value for an expression. This can be used iteratively
5302 by passing a previous result as the VAL argument.
5304 This function is intended to produce the same hash for expressions which
5305 would compare equal using operand_equal_p. */
5308 iterative_hash_expr (const_tree t, hashval_t val)
5311 enum tree_code code;
5315 return iterative_hash_hashval_t (0, val);
5317 code = TREE_CODE (t);
5321 /* Alas, constants aren't shared, so we can't rely on pointer
5324 val = iterative_hash_host_wide_int (TREE_INT_CST_LOW (t), val);
5325 return iterative_hash_host_wide_int (TREE_INT_CST_HIGH (t), val);
5328 unsigned int val2 = real_hash (TREE_REAL_CST_PTR (t));
5330 return iterative_hash_hashval_t (val2, val);
5334 unsigned int val2 = fixed_hash (TREE_FIXED_CST_PTR (t));
5336 return iterative_hash_hashval_t (val2, val);
5339 return iterative_hash (TREE_STRING_POINTER (t),
5340 TREE_STRING_LENGTH (t), val);
5342 val = iterative_hash_expr (TREE_REALPART (t), val);
5343 return iterative_hash_expr (TREE_IMAGPART (t), val);
5345 return iterative_hash_expr (TREE_VECTOR_CST_ELTS (t), val);
5348 /* we can just compare by pointer. */
5349 return iterative_hash_host_wide_int (SSA_NAME_VERSION (t), val);
5352 /* A list of expressions, for a CALL_EXPR or as the elements of a
5354 for (; t; t = TREE_CHAIN (t))
5355 val = iterative_hash_expr (TREE_VALUE (t), val);
5359 unsigned HOST_WIDE_INT idx;
5361 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (t), idx, field, value)
5363 val = iterative_hash_expr (field, val);
5364 val = iterative_hash_expr (value, val);
5369 /* When referring to a built-in FUNCTION_DECL, use the
5370 __builtin__ form. Otherwise nodes that compare equal
5371 according to operand_equal_p might get different
5373 if (DECL_BUILT_IN (t) && built_in_decls[DECL_FUNCTION_CODE (t)])
5375 t = built_in_decls[DECL_FUNCTION_CODE (t)];
5376 code = TREE_CODE (t);
5380 tclass = TREE_CODE_CLASS (code);
5382 if (tclass == tcc_declaration)
5384 /* DECL's have a unique ID */
5385 val = iterative_hash_host_wide_int (DECL_UID (t), val);
5389 gcc_assert (IS_EXPR_CODE_CLASS (tclass));
5391 val = iterative_hash_object (code, val);
5393 /* Don't hash the type, that can lead to having nodes which
5394 compare equal according to operand_equal_p, but which
5395 have different hash codes. */
5396 if (CONVERT_EXPR_CODE_P (code)
5397 || code == NON_LVALUE_EXPR)
5399 /* Make sure to include signness in the hash computation. */
5400 val += TYPE_UNSIGNED (TREE_TYPE (t));
5401 val = iterative_hash_expr (TREE_OPERAND (t, 0), val);
5404 else if (commutative_tree_code (code))
5406 /* It's a commutative expression. We want to hash it the same
5407 however it appears. We do this by first hashing both operands
5408 and then rehashing based on the order of their independent
5410 hashval_t one = iterative_hash_expr (TREE_OPERAND (t, 0), 0);
5411 hashval_t two = iterative_hash_expr (TREE_OPERAND (t, 1), 0);
5415 t = one, one = two, two = t;
5417 val = iterative_hash_hashval_t (one, val);
5418 val = iterative_hash_hashval_t (two, val);
5421 for (i = TREE_OPERAND_LENGTH (t) - 1; i >= 0; --i)
5422 val = iterative_hash_expr (TREE_OPERAND (t, i), val);
5429 /* Generate a hash value for a pair of expressions. This can be used
5430 iteratively by passing a previous result as the VAL argument.
5432 The same hash value is always returned for a given pair of expressions,
5433 regardless of the order in which they are presented. This is useful in
5434 hashing the operands of commutative functions. */
5437 iterative_hash_exprs_commutative (const_tree t1,
5438 const_tree t2, hashval_t val)
5440 hashval_t one = iterative_hash_expr (t1, 0);
5441 hashval_t two = iterative_hash_expr (t2, 0);
5445 t = one, one = two, two = t;
5446 val = iterative_hash_hashval_t (one, val);
5447 val = iterative_hash_hashval_t (two, val);
5452 /* Constructors for pointer, array and function types.
5453 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
5454 constructed by language-dependent code, not here.) */
5456 /* Construct, lay out and return the type of pointers to TO_TYPE with
5457 mode MODE. If CAN_ALIAS_ALL is TRUE, indicate this type can
5458 reference all of memory. If such a type has already been
5459 constructed, reuse it. */
5462 build_pointer_type_for_mode (tree to_type, enum machine_mode mode,
5467 if (to_type == error_mark_node)
5468 return error_mark_node;
5470 /* If the pointed-to type has the may_alias attribute set, force
5471 a TYPE_REF_CAN_ALIAS_ALL pointer to be generated. */
5472 if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (to_type)))
5473 can_alias_all = true;
5475 /* In some cases, languages will have things that aren't a POINTER_TYPE
5476 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_POINTER_TO.
5477 In that case, return that type without regard to the rest of our
5480 ??? This is a kludge, but consistent with the way this function has
5481 always operated and there doesn't seem to be a good way to avoid this
5483 if (TYPE_POINTER_TO (to_type) != 0
5484 && TREE_CODE (TYPE_POINTER_TO (to_type)) != POINTER_TYPE)
5485 return TYPE_POINTER_TO (to_type);
5487 /* First, if we already have a type for pointers to TO_TYPE and it's
5488 the proper mode, use it. */
5489 for (t = TYPE_POINTER_TO (to_type); t; t = TYPE_NEXT_PTR_TO (t))
5490 if (TYPE_MODE (t) == mode && TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
5493 t = make_node (POINTER_TYPE);
5495 TREE_TYPE (t) = to_type;
5496 SET_TYPE_MODE (t, mode);
5497 TYPE_REF_CAN_ALIAS_ALL (t) = can_alias_all;
5498 TYPE_NEXT_PTR_TO (t) = TYPE_POINTER_TO (to_type);
5499 TYPE_POINTER_TO (to_type) = t;
5501 if (TYPE_STRUCTURAL_EQUALITY_P (to_type))
5502 SET_TYPE_STRUCTURAL_EQUALITY (t);
5503 else if (TYPE_CANONICAL (to_type) != to_type)
5505 = build_pointer_type_for_mode (TYPE_CANONICAL (to_type),
5506 mode, can_alias_all);
5508 /* Lay out the type. This function has many callers that are concerned
5509 with expression-construction, and this simplifies them all. */
5515 /* By default build pointers in ptr_mode. */
5518 build_pointer_type (tree to_type)
5520 return build_pointer_type_for_mode (to_type, ptr_mode, false);
5523 /* Same as build_pointer_type_for_mode, but for REFERENCE_TYPE. */
5526 build_reference_type_for_mode (tree to_type, enum machine_mode mode,
5531 if (to_type == error_mark_node)
5532 return error_mark_node;
5534 /* If the pointed-to type has the may_alias attribute set, force
5535 a TYPE_REF_CAN_ALIAS_ALL pointer to be generated. */
5536 if (lookup_attribute ("may_alias", TYPE_ATTRIBUTES (to_type)))
5537 can_alias_all = true;
5539 /* In some cases, languages will have things that aren't a REFERENCE_TYPE
5540 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_REFERENCE_TO.
5541 In that case, return that type without regard to the rest of our
5544 ??? This is a kludge, but consistent with the way this function has
5545 always operated and there doesn't seem to be a good way to avoid this
5547 if (TYPE_REFERENCE_TO (to_type) != 0
5548 && TREE_CODE (TYPE_REFERENCE_TO (to_type)) != REFERENCE_TYPE)
5549 return TYPE_REFERENCE_TO (to_type);
5551 /* First, if we already have a type for pointers to TO_TYPE and it's
5552 the proper mode, use it. */
5553 for (t = TYPE_REFERENCE_TO (to_type); t; t = TYPE_NEXT_REF_TO (t))
5554 if (TYPE_MODE (t) == mode && TYPE_REF_CAN_ALIAS_ALL (t) == can_alias_all)
5557 t = make_node (REFERENCE_TYPE);
5559 TREE_TYPE (t) = to_type;
5560 SET_TYPE_MODE (t, mode);
5561 TYPE_REF_CAN_ALIAS_ALL (t) = can_alias_all;
5562 TYPE_NEXT_REF_TO (t) = TYPE_REFERENCE_TO (to_type);
5563 TYPE_REFERENCE_TO (to_type) = t;
5565 if (TYPE_STRUCTURAL_EQUALITY_P (to_type))
5566 SET_TYPE_STRUCTURAL_EQUALITY (t);
5567 else if (TYPE_CANONICAL (to_type) != to_type)
5569 = build_reference_type_for_mode (TYPE_CANONICAL (to_type),
5570 mode, can_alias_all);
5578 /* Build the node for the type of references-to-TO_TYPE by default
5582 build_reference_type (tree to_type)
5584 return build_reference_type_for_mode (to_type, ptr_mode, false);
5587 /* Build a type that is compatible with t but has no cv quals anywhere
5590 const char *const *const * -> char ***. */
5593 build_type_no_quals (tree t)
5595 switch (TREE_CODE (t))
5598 return build_pointer_type_for_mode (build_type_no_quals (TREE_TYPE (t)),
5600 TYPE_REF_CAN_ALIAS_ALL (t));
5601 case REFERENCE_TYPE:
5603 build_reference_type_for_mode (build_type_no_quals (TREE_TYPE (t)),
5605 TYPE_REF_CAN_ALIAS_ALL (t));
5607 return TYPE_MAIN_VARIANT (t);
5611 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
5612 MAXVAL should be the maximum value in the domain
5613 (one less than the length of the array).
5615 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
5616 We don't enforce this limit, that is up to caller (e.g. language front end).
5617 The limit exists because the result is a signed type and we don't handle
5618 sizes that use more than one HOST_WIDE_INT. */
5621 build_index_type (tree maxval)
5623 tree itype = make_node (INTEGER_TYPE);
5625 TREE_TYPE (itype) = sizetype;
5626 TYPE_PRECISION (itype) = TYPE_PRECISION (sizetype);
5627 TYPE_MIN_VALUE (itype) = size_zero_node;
5628 TYPE_MAX_VALUE (itype) = fold_convert (sizetype, maxval);
5629 SET_TYPE_MODE (itype, TYPE_MODE (sizetype));
5630 TYPE_SIZE (itype) = TYPE_SIZE (sizetype);
5631 TYPE_SIZE_UNIT (itype) = TYPE_SIZE_UNIT (sizetype);
5632 TYPE_ALIGN (itype) = TYPE_ALIGN (sizetype);
5633 TYPE_USER_ALIGN (itype) = TYPE_USER_ALIGN (sizetype);
5635 if (host_integerp (maxval, 1))
5636 return type_hash_canon (tree_low_cst (maxval, 1), itype);
5639 /* Since we cannot hash this type, we need to compare it using
5640 structural equality checks. */
5641 SET_TYPE_STRUCTURAL_EQUALITY (itype);
5646 /* Builds a signed or unsigned integer type of precision PRECISION.
5647 Used for C bitfields whose precision does not match that of
5648 built-in target types. */
5650 build_nonstandard_integer_type (unsigned HOST_WIDE_INT precision,
5653 tree itype = make_node (INTEGER_TYPE);
5655 TYPE_PRECISION (itype) = precision;
5658 fixup_unsigned_type (itype);
5660 fixup_signed_type (itype);
5662 if (host_integerp (TYPE_MAX_VALUE (itype), 1))
5663 return type_hash_canon (tree_low_cst (TYPE_MAX_VALUE (itype), 1), itype);
5668 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
5669 ENUMERAL_TYPE or BOOLEAN_TYPE), with low bound LOWVAL and
5670 high bound HIGHVAL. If TYPE is NULL, sizetype is used. */
5673 build_range_type (tree type, tree lowval, tree highval)
5675 tree itype = make_node (INTEGER_TYPE);
5677 TREE_TYPE (itype) = type;
5678 if (type == NULL_TREE)
5681 TYPE_MIN_VALUE (itype) = fold_convert (type, lowval);
5682 TYPE_MAX_VALUE (itype) = highval ? fold_convert (type, highval) : NULL;
5684 TYPE_PRECISION (itype) = TYPE_PRECISION (type);
5685 SET_TYPE_MODE (itype, TYPE_MODE (type));
5686 TYPE_SIZE (itype) = TYPE_SIZE (type);
5687 TYPE_SIZE_UNIT (itype) = TYPE_SIZE_UNIT (type);
5688 TYPE_ALIGN (itype) = TYPE_ALIGN (type);
5689 TYPE_USER_ALIGN (itype) = TYPE_USER_ALIGN (type);
5691 if (host_integerp (lowval, 0) && highval != 0 && host_integerp (highval, 0))
5692 return type_hash_canon (tree_low_cst (highval, 0)
5693 - tree_low_cst (lowval, 0),
5699 /* Just like build_index_type, but takes lowval and highval instead
5700 of just highval (maxval). */
5703 build_index_2_type (tree lowval, tree highval)
5705 return build_range_type (sizetype, lowval, highval);
5708 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
5709 and number of elements specified by the range of values of INDEX_TYPE.
5710 If such a type has already been constructed, reuse it. */
5713 build_array_type (tree elt_type, tree index_type)
5716 hashval_t hashcode = 0;
5718 if (TREE_CODE (elt_type) == FUNCTION_TYPE)
5720 error ("arrays of functions are not meaningful");
5721 elt_type = integer_type_node;
5724 t = make_node (ARRAY_TYPE);
5725 TREE_TYPE (t) = elt_type;
5726 TYPE_DOMAIN (t) = index_type;
5728 if (index_type == 0)
5731 hashcode = iterative_hash_object (TYPE_HASH (elt_type), hashcode);
5732 t = type_hash_canon (hashcode, t);
5736 if (TYPE_CANONICAL (t) == t)
5738 if (TYPE_STRUCTURAL_EQUALITY_P (elt_type))
5739 SET_TYPE_STRUCTURAL_EQUALITY (t);
5740 else if (TYPE_CANONICAL (elt_type) != elt_type)
5742 = build_array_type (TYPE_CANONICAL (elt_type), index_type);
5748 hashcode = iterative_hash_object (TYPE_HASH (elt_type), hashcode);
5749 hashcode = iterative_hash_object (TYPE_HASH (index_type), hashcode);
5750 t = type_hash_canon (hashcode, t);
5752 if (!COMPLETE_TYPE_P (t))
5755 if (TYPE_CANONICAL (t) == t)
5757 if (TYPE_STRUCTURAL_EQUALITY_P (elt_type)
5758 || TYPE_STRUCTURAL_EQUALITY_P (index_type))
5759 SET_TYPE_STRUCTURAL_EQUALITY (t);
5760 else if (TYPE_CANONICAL (elt_type) != elt_type
5761 || TYPE_CANONICAL (index_type) != index_type)
5763 = build_array_type (TYPE_CANONICAL (elt_type),
5764 TYPE_CANONICAL (index_type));
5770 /* Recursively examines the array elements of TYPE, until a non-array
5771 element type is found. */
5774 strip_array_types (tree type)
5776 while (TREE_CODE (type) == ARRAY_TYPE)
5777 type = TREE_TYPE (type);
5782 /* Computes the canonical argument types from the argument type list
5785 Upon return, *ANY_STRUCTURAL_P will be true iff either it was true
5786 on entry to this function, or if any of the ARGTYPES are
5789 Upon return, *ANY_NONCANONICAL_P will be true iff either it was
5790 true on entry to this function, or if any of the ARGTYPES are
5793 Returns a canonical argument list, which may be ARGTYPES when the
5794 canonical argument list is unneeded (i.e., *ANY_STRUCTURAL_P is
5795 true) or would not differ from ARGTYPES. */
5798 maybe_canonicalize_argtypes(tree argtypes,
5799 bool *any_structural_p,
5800 bool *any_noncanonical_p)
5803 bool any_noncanonical_argtypes_p = false;
5805 for (arg = argtypes; arg && !(*any_structural_p); arg = TREE_CHAIN (arg))
5807 if (!TREE_VALUE (arg) || TREE_VALUE (arg) == error_mark_node)
5808 /* Fail gracefully by stating that the type is structural. */
5809 *any_structural_p = true;
5810 else if (TYPE_STRUCTURAL_EQUALITY_P (TREE_VALUE (arg)))
5811 *any_structural_p = true;
5812 else if (TYPE_CANONICAL (TREE_VALUE (arg)) != TREE_VALUE (arg)
5813 || TREE_PURPOSE (arg))
5814 /* If the argument has a default argument, we consider it
5815 non-canonical even though the type itself is canonical.
5816 That way, different variants of function and method types
5817 with default arguments will all point to the variant with
5818 no defaults as their canonical type. */
5819 any_noncanonical_argtypes_p = true;
5822 if (*any_structural_p)
5825 if (any_noncanonical_argtypes_p)
5827 /* Build the canonical list of argument types. */
5828 tree canon_argtypes = NULL_TREE;
5829 bool is_void = false;
5831 for (arg = argtypes; arg; arg = TREE_CHAIN (arg))
5833 if (arg == void_list_node)
5836 canon_argtypes = tree_cons (NULL_TREE,
5837 TYPE_CANONICAL (TREE_VALUE (arg)),
5841 canon_argtypes = nreverse (canon_argtypes);
5843 canon_argtypes = chainon (canon_argtypes, void_list_node);
5845 /* There is a non-canonical type. */
5846 *any_noncanonical_p = true;
5847 return canon_argtypes;
5850 /* The canonical argument types are the same as ARGTYPES. */
5854 /* Construct, lay out and return
5855 the type of functions returning type VALUE_TYPE
5856 given arguments of types ARG_TYPES.
5857 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
5858 are data type nodes for the arguments of the function.
5859 If such a type has already been constructed, reuse it. */
5862 build_function_type (tree value_type, tree arg_types)
5865 hashval_t hashcode = 0;
5866 bool any_structural_p, any_noncanonical_p;
5867 tree canon_argtypes;
5869 if (TREE_CODE (value_type) == FUNCTION_TYPE)
5871 error ("function return type cannot be function");
5872 value_type = integer_type_node;
5875 /* Make a node of the sort we want. */
5876 t = make_node (FUNCTION_TYPE);
5877 TREE_TYPE (t) = value_type;
5878 TYPE_ARG_TYPES (t) = arg_types;
5880 /* If we already have such a type, use the old one. */
5881 hashcode = iterative_hash_object (TYPE_HASH (value_type), hashcode);
5882 hashcode = type_hash_list (arg_types, hashcode);
5883 t = type_hash_canon (hashcode, t);
5885 /* Set up the canonical type. */
5886 any_structural_p = TYPE_STRUCTURAL_EQUALITY_P (value_type);
5887 any_noncanonical_p = TYPE_CANONICAL (value_type) != value_type;
5888 canon_argtypes = maybe_canonicalize_argtypes (arg_types,
5890 &any_noncanonical_p);
5891 if (any_structural_p)
5892 SET_TYPE_STRUCTURAL_EQUALITY (t);
5893 else if (any_noncanonical_p)
5894 TYPE_CANONICAL (t) = build_function_type (TYPE_CANONICAL (value_type),
5897 if (!COMPLETE_TYPE_P (t))
5902 /* Build variant of function type ORIG_TYPE skipping ARGS_TO_SKIP. */
5905 build_function_type_skip_args (tree orig_type, bitmap args_to_skip)
5907 tree new_type = NULL;
5908 tree args, new_args = NULL, t;
5912 for (args = TYPE_ARG_TYPES (orig_type); args && args != void_list_node;
5913 args = TREE_CHAIN (args), i++)
5914 if (!bitmap_bit_p (args_to_skip, i))
5915 new_args = tree_cons (NULL_TREE, TREE_VALUE (args), new_args);
5917 new_reversed = nreverse (new_args);
5921 TREE_CHAIN (new_args) = void_list_node;
5923 new_reversed = void_list_node;
5925 gcc_assert (new_reversed);
5927 /* Use copy_node to preserve as much as possible from original type
5928 (debug info, attribute lists etc.)
5929 Exception is METHOD_TYPEs must have THIS argument.
5930 When we are asked to remove it, we need to build new FUNCTION_TYPE
5932 if (TREE_CODE (orig_type) != METHOD_TYPE
5933 || !bitmap_bit_p (args_to_skip, 0))
5935 new_type = copy_node (orig_type);
5936 TYPE_ARG_TYPES (new_type) = new_reversed;
5941 = build_distinct_type_copy (build_function_type (TREE_TYPE (orig_type),
5943 TYPE_CONTEXT (new_type) = TYPE_CONTEXT (orig_type);
5946 /* This is a new type, not a copy of an old type. Need to reassociate
5947 variants. We can handle everything except the main variant lazily. */
5948 t = TYPE_MAIN_VARIANT (orig_type);
5951 TYPE_MAIN_VARIANT (new_type) = t;
5952 TYPE_NEXT_VARIANT (new_type) = TYPE_NEXT_VARIANT (t);
5953 TYPE_NEXT_VARIANT (t) = new_type;
5957 TYPE_MAIN_VARIANT (new_type) = new_type;
5958 TYPE_NEXT_VARIANT (new_type) = NULL;
5963 /* Build variant of function type ORIG_TYPE skipping ARGS_TO_SKIP.
5965 Arguments from DECL_ARGUMENTS list can't be removed now, since they are
5966 linked by TREE_CHAIN directly. It is caller responsibility to eliminate
5967 them when they are being duplicated (i.e. copy_arguments_for_versioning). */
5970 build_function_decl_skip_args (tree orig_decl, bitmap args_to_skip)
5972 tree new_decl = copy_node (orig_decl);
5975 new_type = TREE_TYPE (orig_decl);
5976 if (prototype_p (new_type))
5977 new_type = build_function_type_skip_args (new_type, args_to_skip);
5978 TREE_TYPE (new_decl) = new_type;
5980 /* For declarations setting DECL_VINDEX (i.e. methods)
5981 we expect first argument to be THIS pointer. */
5982 if (bitmap_bit_p (args_to_skip, 0))
5983 DECL_VINDEX (new_decl) = NULL_TREE;
5987 /* Build a function type. The RETURN_TYPE is the type returned by the
5988 function. If VAARGS is set, no void_type_node is appended to the
5989 the list. ARGP muse be alway be terminated be a NULL_TREE. */
5992 build_function_type_list_1 (bool vaargs, tree return_type, va_list argp)
5996 t = va_arg (argp, tree);
5997 for (args = NULL_TREE; t != NULL_TREE; t = va_arg (argp, tree))
5998 args = tree_cons (NULL_TREE, t, args);
6003 if (args != NULL_TREE)
6004 args = nreverse (args);
6005 gcc_assert (args != NULL_TREE && last != void_list_node);
6007 else if (args == NULL_TREE)
6008 args = void_list_node;
6012 args = nreverse (args);
6013 TREE_CHAIN (last) = void_list_node;
6015 args = build_function_type (return_type, args);
6020 /* Build a function type. The RETURN_TYPE is the type returned by the
6021 function. If additional arguments are provided, they are
6022 additional argument types. The list of argument types must always
6023 be terminated by NULL_TREE. */
6026 build_function_type_list (tree return_type, ...)
6031 va_start (p, return_type);
6032 args = build_function_type_list_1 (false, return_type, p);
6037 /* Build a variable argument function type. The RETURN_TYPE is the
6038 type returned by the function. If additional arguments are provided,
6039 they are additional argument types. The list of argument types must
6040 always be terminated by NULL_TREE. */
6043 build_varargs_function_type_list (tree return_type, ...)
6048 va_start (p, return_type);
6049 args = build_function_type_list_1 (true, return_type, p);
6055 /* Build a METHOD_TYPE for a member of BASETYPE. The RETTYPE (a TYPE)
6056 and ARGTYPES (a TREE_LIST) are the return type and arguments types
6057 for the method. An implicit additional parameter (of type
6058 pointer-to-BASETYPE) is added to the ARGTYPES. */
6061 build_method_type_directly (tree basetype,
6068 bool any_structural_p, any_noncanonical_p;
6069 tree canon_argtypes;
6071 /* Make a node of the sort we want. */
6072 t = make_node (METHOD_TYPE);
6074 TYPE_METHOD_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
6075 TREE_TYPE (t) = rettype;
6076 ptype = build_pointer_type (basetype);
6078 /* The actual arglist for this function includes a "hidden" argument
6079 which is "this". Put it into the list of argument types. */
6080 argtypes = tree_cons (NULL_TREE, ptype, argtypes);
6081 TYPE_ARG_TYPES (t) = argtypes;
6083 /* If we already have such a type, use the old one. */
6084 hashcode = iterative_hash_object (TYPE_HASH (basetype), hashcode);
6085 hashcode = iterative_hash_object (TYPE_HASH (rettype), hashcode);
6086 hashcode = type_hash_list (argtypes, hashcode);
6087 t = type_hash_canon (hashcode, t);
6089 /* Set up the canonical type. */
6091 = (TYPE_STRUCTURAL_EQUALITY_P (basetype)
6092 || TYPE_STRUCTURAL_EQUALITY_P (rettype));
6094 = (TYPE_CANONICAL (basetype) != basetype
6095 || TYPE_CANONICAL (rettype) != rettype);
6096 canon_argtypes = maybe_canonicalize_argtypes (TREE_CHAIN (argtypes),
6098 &any_noncanonical_p);
6099 if (any_structural_p)
6100 SET_TYPE_STRUCTURAL_EQUALITY (t);
6101 else if (any_noncanonical_p)
6103 = build_method_type_directly (TYPE_CANONICAL (basetype),
6104 TYPE_CANONICAL (rettype),
6106 if (!COMPLETE_TYPE_P (t))
6112 /* Construct, lay out and return the type of methods belonging to class
6113 BASETYPE and whose arguments and values are described by TYPE.
6114 If that type exists already, reuse it.
6115 TYPE must be a FUNCTION_TYPE node. */
6118 build_method_type (tree basetype, tree type)
6120 gcc_assert (TREE_CODE (type) == FUNCTION_TYPE);
6122 return build_method_type_directly (basetype,
6124 TYPE_ARG_TYPES (type));
6127 /* Construct, lay out and return the type of offsets to a value
6128 of type TYPE, within an object of type BASETYPE.
6129 If a suitable offset type exists already, reuse it. */
6132 build_offset_type (tree basetype, tree type)
6135 hashval_t hashcode = 0;
6137 /* Make a node of the sort we want. */
6138 t = make_node (OFFSET_TYPE);
6140 TYPE_OFFSET_BASETYPE (t) = TYPE_MAIN_VARIANT (basetype);
6141 TREE_TYPE (t) = type;
6143 /* If we already have such a type, use the old one. */
6144 hashcode = iterative_hash_object (TYPE_HASH (basetype), hashcode);
6145 hashcode = iterative_hash_object (TYPE_HASH (type), hashcode);
6146 t = type_hash_canon (hashcode, t);
6148 if (!COMPLETE_TYPE_P (t))
6151 if (TYPE_CANONICAL (t) == t)
6153 if (TYPE_STRUCTURAL_EQUALITY_P (basetype)
6154 || TYPE_STRUCTURAL_EQUALITY_P (type))
6155 SET_TYPE_STRUCTURAL_EQUALITY (t);
6156 else if (TYPE_CANONICAL (TYPE_MAIN_VARIANT (basetype)) != basetype
6157 || TYPE_CANONICAL (type) != type)
6159 = build_offset_type (TYPE_CANONICAL (TYPE_MAIN_VARIANT (basetype)),
6160 TYPE_CANONICAL (type));
6166 /* Create a complex type whose components are COMPONENT_TYPE. */
6169 build_complex_type (tree component_type)
6174 gcc_assert (INTEGRAL_TYPE_P (component_type)
6175 || SCALAR_FLOAT_TYPE_P (component_type)
6176 || FIXED_POINT_TYPE_P (component_type));
6178 /* Make a node of the sort we want. */
6179 t = make_node (COMPLEX_TYPE);
6181 TREE_TYPE (t) = TYPE_MAIN_VARIANT (component_type);
6183 /* If we already have such a type, use the old one. */
6184 hashcode = iterative_hash_object (TYPE_HASH (component_type), 0);
6185 t = type_hash_canon (hashcode, t);
6187 if (!COMPLETE_TYPE_P (t))
6190 if (TYPE_CANONICAL (t) == t)
6192 if (TYPE_STRUCTURAL_EQUALITY_P (component_type))
6193 SET_TYPE_STRUCTURAL_EQUALITY (t);
6194 else if (TYPE_CANONICAL (component_type) != component_type)
6196 = build_complex_type (TYPE_CANONICAL (component_type));
6199 /* We need to create a name, since complex is a fundamental type. */
6200 if (! TYPE_NAME (t))
6203 if (component_type == char_type_node)
6204 name = "complex char";
6205 else if (component_type == signed_char_type_node)
6206 name = "complex signed char";
6207 else if (component_type == unsigned_char_type_node)
6208 name = "complex unsigned char";
6209 else if (component_type == short_integer_type_node)
6210 name = "complex short int";
6211 else if (component_type == short_unsigned_type_node)
6212 name = "complex short unsigned int";
6213 else if (component_type == integer_type_node)
6214 name = "complex int";
6215 else if (component_type == unsigned_type_node)
6216 name = "complex unsigned int";
6217 else if (component_type == long_integer_type_node)
6218 name = "complex long int";
6219 else if (component_type == long_unsigned_type_node)
6220 name = "complex long unsigned int";
6221 else if (component_type == long_long_integer_type_node)
6222 name = "complex long long int";
6223 else if (component_type == long_long_unsigned_type_node)
6224 name = "complex long long unsigned int";
6229 TYPE_NAME (t) = build_decl (TYPE_DECL, get_identifier (name), t);
6232 return build_qualified_type (t, TYPE_QUALS (component_type));
6235 /* If TYPE is a real or complex floating-point type and the target
6236 does not directly support arithmetic on TYPE then return the wider
6237 type to be used for arithmetic on TYPE. Otherwise, return
6241 excess_precision_type (tree type)
6243 if (flag_excess_precision != EXCESS_PRECISION_FAST)
6245 int flt_eval_method = TARGET_FLT_EVAL_METHOD;
6246 switch (TREE_CODE (type))
6249 switch (flt_eval_method)
6252 if (TYPE_MODE (type) == TYPE_MODE (float_type_node))
6253 return double_type_node;
6256 if (TYPE_MODE (type) == TYPE_MODE (float_type_node)
6257 || TYPE_MODE (type) == TYPE_MODE (double_type_node))
6258 return long_double_type_node;
6265 if (TREE_CODE (TREE_TYPE (type)) != REAL_TYPE)
6267 switch (flt_eval_method)
6270 if (TYPE_MODE (TREE_TYPE (type)) == TYPE_MODE (float_type_node))
6271 return complex_double_type_node;
6274 if (TYPE_MODE (TREE_TYPE (type)) == TYPE_MODE (float_type_node)
6275 || (TYPE_MODE (TREE_TYPE (type))
6276 == TYPE_MODE (double_type_node)))
6277 return complex_long_double_type_node;
6290 /* Return OP, stripped of any conversions to wider types as much as is safe.
6291 Converting the value back to OP's type makes a value equivalent to OP.
6293 If FOR_TYPE is nonzero, we return a value which, if converted to
6294 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
6296 OP must have integer, real or enumeral type. Pointers are not allowed!
6298 There are some cases where the obvious value we could return
6299 would regenerate to OP if converted to OP's type,
6300 but would not extend like OP to wider types.
6301 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
6302 For example, if OP is (unsigned short)(signed char)-1,
6303 we avoid returning (signed char)-1 if FOR_TYPE is int,
6304 even though extending that to an unsigned short would regenerate OP,
6305 since the result of extending (signed char)-1 to (int)
6306 is different from (int) OP. */
6309 get_unwidened (tree op, tree for_type)
6311 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
6312 tree type = TREE_TYPE (op);
6314 = TYPE_PRECISION (for_type != 0 ? for_type : type);
6316 = (for_type != 0 && for_type != type
6317 && final_prec > TYPE_PRECISION (type)
6318 && TYPE_UNSIGNED (type));
6321 while (CONVERT_EXPR_P (op))
6325 /* TYPE_PRECISION on vector types has different meaning
6326 (TYPE_VECTOR_SUBPARTS) and casts from vectors are view conversions,
6327 so avoid them here. */
6328 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (op, 0))) == VECTOR_TYPE)
6331 bitschange = TYPE_PRECISION (TREE_TYPE (op))
6332 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0)));
6334 /* Truncations are many-one so cannot be removed.
6335 Unless we are later going to truncate down even farther. */
6337 && final_prec > TYPE_PRECISION (TREE_TYPE (op)))
6340 /* See what's inside this conversion. If we decide to strip it,
6342 op = TREE_OPERAND (op, 0);
6344 /* If we have not stripped any zero-extensions (uns is 0),
6345 we can strip any kind of extension.
6346 If we have previously stripped a zero-extension,
6347 only zero-extensions can safely be stripped.
6348 Any extension can be stripped if the bits it would produce
6349 are all going to be discarded later by truncating to FOR_TYPE. */
6353 if (! uns || final_prec <= TYPE_PRECISION (TREE_TYPE (op)))
6355 /* TYPE_UNSIGNED says whether this is a zero-extension.
6356 Let's avoid computing it if it does not affect WIN
6357 and if UNS will not be needed again. */
6359 || CONVERT_EXPR_P (op))
6360 && TYPE_UNSIGNED (TREE_TYPE (op)))
6371 /* Return OP or a simpler expression for a narrower value
6372 which can be sign-extended or zero-extended to give back OP.
6373 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
6374 or 0 if the value should be sign-extended. */
6377 get_narrower (tree op, int *unsignedp_ptr)
6382 bool integral_p = INTEGRAL_TYPE_P (TREE_TYPE (op));
6384 while (TREE_CODE (op) == NOP_EXPR)
6387 = (TYPE_PRECISION (TREE_TYPE (op))
6388 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op, 0))));
6390 /* Truncations are many-one so cannot be removed. */
6394 /* See what's inside this conversion. If we decide to strip it,
6399 op = TREE_OPERAND (op, 0);
6400 /* An extension: the outermost one can be stripped,
6401 but remember whether it is zero or sign extension. */
6403 uns = TYPE_UNSIGNED (TREE_TYPE (op));
6404 /* Otherwise, if a sign extension has been stripped,
6405 only sign extensions can now be stripped;
6406 if a zero extension has been stripped, only zero-extensions. */
6407 else if (uns != TYPE_UNSIGNED (TREE_TYPE (op)))
6411 else /* bitschange == 0 */
6413 /* A change in nominal type can always be stripped, but we must
6414 preserve the unsignedness. */
6416 uns = TYPE_UNSIGNED (TREE_TYPE (op));
6418 op = TREE_OPERAND (op, 0);
6419 /* Keep trying to narrow, but don't assign op to win if it
6420 would turn an integral type into something else. */
6421 if (INTEGRAL_TYPE_P (TREE_TYPE (op)) != integral_p)
6428 if (TREE_CODE (op) == COMPONENT_REF
6429 /* Since type_for_size always gives an integer type. */
6430 && TREE_CODE (TREE_TYPE (op)) != REAL_TYPE
6431 && TREE_CODE (TREE_TYPE (op)) != FIXED_POINT_TYPE
6432 /* Ensure field is laid out already. */
6433 && DECL_SIZE (TREE_OPERAND (op, 1)) != 0
6434 && host_integerp (DECL_SIZE (TREE_OPERAND (op, 1)), 1))
6436 unsigned HOST_WIDE_INT innerprec
6437 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op, 1)), 1);
6438 int unsignedp = (DECL_UNSIGNED (TREE_OPERAND (op, 1))
6439 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op, 1))));
6440 tree type = lang_hooks.types.type_for_size (innerprec, unsignedp);
6442 /* We can get this structure field in a narrower type that fits it,
6443 but the resulting extension to its nominal type (a fullword type)
6444 must satisfy the same conditions as for other extensions.
6446 Do this only for fields that are aligned (not bit-fields),
6447 because when bit-field insns will be used there is no
6448 advantage in doing this. */
6450 if (innerprec < TYPE_PRECISION (TREE_TYPE (op))
6451 && ! DECL_BIT_FIELD (TREE_OPERAND (op, 1))
6452 && (first || uns == DECL_UNSIGNED (TREE_OPERAND (op, 1)))
6456 uns = DECL_UNSIGNED (TREE_OPERAND (op, 1));
6457 win = fold_convert (type, op);
6461 *unsignedp_ptr = uns;
6465 /* Nonzero if integer constant C has a value that is permissible
6466 for type TYPE (an INTEGER_TYPE). */
6469 int_fits_type_p (const_tree c, const_tree type)
6471 tree type_low_bound, type_high_bound;
6472 bool ok_for_low_bound, ok_for_high_bound, unsc;
6475 dc = tree_to_double_int (c);
6476 unsc = TYPE_UNSIGNED (TREE_TYPE (c));
6478 if (TREE_CODE (TREE_TYPE (c)) == INTEGER_TYPE
6479 && TYPE_IS_SIZETYPE (TREE_TYPE (c))
6481 /* So c is an unsigned integer whose type is sizetype and type is not.
6482 sizetype'd integers are sign extended even though they are
6483 unsigned. If the integer value fits in the lower end word of c,
6484 and if the higher end word has all its bits set to 1, that
6485 means the higher end bits are set to 1 only for sign extension.
6486 So let's convert c into an equivalent zero extended unsigned
6488 dc = double_int_zext (dc, TYPE_PRECISION (TREE_TYPE (c)));
6491 type_low_bound = TYPE_MIN_VALUE (type);
6492 type_high_bound = TYPE_MAX_VALUE (type);
6494 /* If at least one bound of the type is a constant integer, we can check
6495 ourselves and maybe make a decision. If no such decision is possible, but
6496 this type is a subtype, try checking against that. Otherwise, use
6497 fit_double_type, which checks against the precision.
6499 Compute the status for each possibly constant bound, and return if we see
6500 one does not match. Use ok_for_xxx_bound for this purpose, assigning -1
6501 for "unknown if constant fits", 0 for "constant known *not* to fit" and 1
6502 for "constant known to fit". */
6504 /* Check if c >= type_low_bound. */
6505 if (type_low_bound && TREE_CODE (type_low_bound) == INTEGER_CST)
6507 dd = tree_to_double_int (type_low_bound);
6508 if (TREE_CODE (type) == INTEGER_TYPE
6509 && TYPE_IS_SIZETYPE (type)
6510 && TYPE_UNSIGNED (type))
6511 dd = double_int_zext (dd, TYPE_PRECISION (type));
6512 if (unsc != TYPE_UNSIGNED (TREE_TYPE (type_low_bound)))
6514 int c_neg = (!unsc && double_int_negative_p (dc));
6515 int t_neg = (unsc && double_int_negative_p (dd));
6517 if (c_neg && !t_neg)
6519 if ((c_neg || !t_neg) && double_int_ucmp (dc, dd) < 0)
6522 else if (double_int_cmp (dc, dd, unsc) < 0)
6524 ok_for_low_bound = true;
6527 ok_for_low_bound = false;
6529 /* Check if c <= type_high_bound. */
6530 if (type_high_bound && TREE_CODE (type_high_bound) == INTEGER_CST)
6532 dd = tree_to_double_int (type_high_bound);
6533 if (TREE_CODE (type) == INTEGER_TYPE
6534 && TYPE_IS_SIZETYPE (type)
6535 && TYPE_UNSIGNED (type))
6536 dd = double_int_zext (dd, TYPE_PRECISION (type));
6537 if (unsc != TYPE_UNSIGNED (TREE_TYPE (type_high_bound)))
6539 int c_neg = (!unsc && double_int_negative_p (dc));
6540 int t_neg = (unsc && double_int_negative_p (dd));
6542 if (t_neg && !c_neg)
6544 if ((t_neg || !c_neg) && double_int_ucmp (dc, dd) > 0)
6547 else if (double_int_cmp (dc, dd, unsc) > 0)
6549 ok_for_high_bound = true;
6552 ok_for_high_bound = false;
6554 /* If the constant fits both bounds, the result is known. */
6555 if (ok_for_low_bound && ok_for_high_bound)
6558 /* Perform some generic filtering which may allow making a decision
6559 even if the bounds are not constant. First, negative integers
6560 never fit in unsigned types, */
6561 if (TYPE_UNSIGNED (type) && !unsc && double_int_negative_p (dc))
6564 /* Second, narrower types always fit in wider ones. */
6565 if (TYPE_PRECISION (type) > TYPE_PRECISION (TREE_TYPE (c)))
6568 /* Third, unsigned integers with top bit set never fit signed types. */
6569 if (! TYPE_UNSIGNED (type) && unsc)
6571 int prec = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (c))) - 1;
6572 if (prec < HOST_BITS_PER_WIDE_INT)
6574 if (((((unsigned HOST_WIDE_INT) 1) << prec) & dc.low) != 0)
6577 else if (((((unsigned HOST_WIDE_INT) 1)
6578 << (prec - HOST_BITS_PER_WIDE_INT)) & dc.high) != 0)
6582 /* If we haven't been able to decide at this point, there nothing more we
6583 can check ourselves here. Look at the base type if we have one and it
6584 has the same precision. */
6585 if (TREE_CODE (type) == INTEGER_TYPE
6586 && TREE_TYPE (type) != 0
6587 && TYPE_PRECISION (type) == TYPE_PRECISION (TREE_TYPE (type)))
6589 type = TREE_TYPE (type);
6593 /* Or to fit_double_type, if nothing else. */
6594 return !fit_double_type (dc.low, dc.high, &dc.low, &dc.high, type);
6597 /* Stores bounds of an integer TYPE in MIN and MAX. If TYPE has non-constant
6598 bounds or is a POINTER_TYPE, the maximum and/or minimum values that can be
6599 represented (assuming two's-complement arithmetic) within the bit
6600 precision of the type are returned instead. */
6603 get_type_static_bounds (const_tree type, mpz_t min, mpz_t max)
6605 if (!POINTER_TYPE_P (type) && TYPE_MIN_VALUE (type)
6606 && TREE_CODE (TYPE_MIN_VALUE (type)) == INTEGER_CST)
6607 mpz_set_double_int (min, tree_to_double_int (TYPE_MIN_VALUE (type)),
6608 TYPE_UNSIGNED (type));
6611 if (TYPE_UNSIGNED (type))
6612 mpz_set_ui (min, 0);
6616 mn = double_int_mask (TYPE_PRECISION (type) - 1);
6617 mn = double_int_sext (double_int_add (mn, double_int_one),
6618 TYPE_PRECISION (type));
6619 mpz_set_double_int (min, mn, false);
6623 if (!POINTER_TYPE_P (type) && TYPE_MAX_VALUE (type)
6624 && TREE_CODE (TYPE_MAX_VALUE (type)) == INTEGER_CST)
6625 mpz_set_double_int (max, tree_to_double_int (TYPE_MAX_VALUE (type)),
6626 TYPE_UNSIGNED (type));
6629 if (TYPE_UNSIGNED (type))
6630 mpz_set_double_int (max, double_int_mask (TYPE_PRECISION (type)),
6633 mpz_set_double_int (max, double_int_mask (TYPE_PRECISION (type) - 1),
6638 /* Return true if VAR is an automatic variable defined in function FN. */
6641 auto_var_in_fn_p (const_tree var, const_tree fn)
6643 return (DECL_P (var) && DECL_CONTEXT (var) == fn
6644 && (((TREE_CODE (var) == VAR_DECL || TREE_CODE (var) == PARM_DECL)
6645 && ! TREE_STATIC (var))
6646 || TREE_CODE (var) == LABEL_DECL
6647 || TREE_CODE (var) == RESULT_DECL));
6650 /* Subprogram of following function. Called by walk_tree.
6652 Return *TP if it is an automatic variable or parameter of the
6653 function passed in as DATA. */
6656 find_var_from_fn (tree *tp, int *walk_subtrees, void *data)
6658 tree fn = (tree) data;
6663 else if (DECL_P (*tp)
6664 && auto_var_in_fn_p (*tp, fn))
6670 /* Returns true if T is, contains, or refers to a type with variable
6671 size. For METHOD_TYPEs and FUNCTION_TYPEs we exclude the
6672 arguments, but not the return type. If FN is nonzero, only return
6673 true if a modifier of the type or position of FN is a variable or
6674 parameter inside FN.
6676 This concept is more general than that of C99 'variably modified types':
6677 in C99, a struct type is never variably modified because a VLA may not
6678 appear as a structure member. However, in GNU C code like:
6680 struct S { int i[f()]; };
6682 is valid, and other languages may define similar constructs. */
6685 variably_modified_type_p (tree type, tree fn)
6689 /* Test if T is either variable (if FN is zero) or an expression containing
6690 a variable in FN. */
6691 #define RETURN_TRUE_IF_VAR(T) \
6692 do { tree _t = (T); \
6693 if (_t && _t != error_mark_node && TREE_CODE (_t) != INTEGER_CST \
6694 && (!fn || walk_tree (&_t, find_var_from_fn, fn, NULL))) \
6695 return true; } while (0)
6697 if (type == error_mark_node)
6700 /* If TYPE itself has variable size, it is variably modified. */
6701 RETURN_TRUE_IF_VAR (TYPE_SIZE (type));
6702 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT (type));
6704 switch (TREE_CODE (type))
6707 case REFERENCE_TYPE:
6709 if (variably_modified_type_p (TREE_TYPE (type), fn))
6715 /* If TYPE is a function type, it is variably modified if the
6716 return type is variably modified. */
6717 if (variably_modified_type_p (TREE_TYPE (type), fn))
6723 case FIXED_POINT_TYPE:
6726 /* Scalar types are variably modified if their end points
6728 RETURN_TRUE_IF_VAR (TYPE_MIN_VALUE (type));
6729 RETURN_TRUE_IF_VAR (TYPE_MAX_VALUE (type));
6734 case QUAL_UNION_TYPE:
6735 /* We can't see if any of the fields are variably-modified by the
6736 definition we normally use, since that would produce infinite
6737 recursion via pointers. */
6738 /* This is variably modified if some field's type is. */
6739 for (t = TYPE_FIELDS (type); t; t = TREE_CHAIN (t))
6740 if (TREE_CODE (t) == FIELD_DECL)
6742 RETURN_TRUE_IF_VAR (DECL_FIELD_OFFSET (t));
6743 RETURN_TRUE_IF_VAR (DECL_SIZE (t));
6744 RETURN_TRUE_IF_VAR (DECL_SIZE_UNIT (t));
6746 if (TREE_CODE (type) == QUAL_UNION_TYPE)
6747 RETURN_TRUE_IF_VAR (DECL_QUALIFIER (t));
6752 /* Do not call ourselves to avoid infinite recursion. This is
6753 variably modified if the element type is. */
6754 RETURN_TRUE_IF_VAR (TYPE_SIZE (TREE_TYPE (type)));
6755 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT (TREE_TYPE (type)));
6762 /* The current language may have other cases to check, but in general,
6763 all other types are not variably modified. */
6764 return lang_hooks.tree_inlining.var_mod_type_p (type, fn);
6766 #undef RETURN_TRUE_IF_VAR
6769 /* Given a DECL or TYPE, return the scope in which it was declared, or
6770 NULL_TREE if there is no containing scope. */
6773 get_containing_scope (const_tree t)
6775 return (TYPE_P (t) ? TYPE_CONTEXT (t) : DECL_CONTEXT (t));
6778 /* Return the innermost context enclosing DECL that is
6779 a FUNCTION_DECL, or zero if none. */
6782 decl_function_context (const_tree decl)
6786 if (TREE_CODE (decl) == ERROR_MARK)
6789 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
6790 where we look up the function at runtime. Such functions always take
6791 a first argument of type 'pointer to real context'.
6793 C++ should really be fixed to use DECL_CONTEXT for the real context,
6794 and use something else for the "virtual context". */
6795 else if (TREE_CODE (decl) == FUNCTION_DECL && DECL_VINDEX (decl))
6798 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl)))));
6800 context = DECL_CONTEXT (decl);
6802 while (context && TREE_CODE (context) != FUNCTION_DECL)
6804 if (TREE_CODE (context) == BLOCK)
6805 context = BLOCK_SUPERCONTEXT (context);
6807 context = get_containing_scope (context);
6813 /* Return the innermost context enclosing DECL that is
6814 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
6815 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
6818 decl_type_context (const_tree decl)
6820 tree context = DECL_CONTEXT (decl);
6823 switch (TREE_CODE (context))
6825 case NAMESPACE_DECL:
6826 case TRANSLATION_UNIT_DECL:
6831 case QUAL_UNION_TYPE:
6836 context = DECL_CONTEXT (context);
6840 context = BLOCK_SUPERCONTEXT (context);
6850 /* CALL is a CALL_EXPR. Return the declaration for the function
6851 called, or NULL_TREE if the called function cannot be
6855 get_callee_fndecl (const_tree call)
6859 if (call == error_mark_node)
6860 return error_mark_node;
6862 /* It's invalid to call this function with anything but a
6864 gcc_assert (TREE_CODE (call) == CALL_EXPR);
6866 /* The first operand to the CALL is the address of the function
6868 addr = CALL_EXPR_FN (call);
6872 /* If this is a readonly function pointer, extract its initial value. */
6873 if (DECL_P (addr) && TREE_CODE (addr) != FUNCTION_DECL
6874 && TREE_READONLY (addr) && ! TREE_THIS_VOLATILE (addr)
6875 && DECL_INITIAL (addr))
6876 addr = DECL_INITIAL (addr);
6878 /* If the address is just `&f' for some function `f', then we know
6879 that `f' is being called. */
6880 if (TREE_CODE (addr) == ADDR_EXPR
6881 && TREE_CODE (TREE_OPERAND (addr, 0)) == FUNCTION_DECL)
6882 return TREE_OPERAND (addr, 0);
6884 /* We couldn't figure out what was being called. */
6888 /* Print debugging information about tree nodes generated during the compile,
6889 and any language-specific information. */
6892 dump_tree_statistics (void)
6894 #ifdef GATHER_STATISTICS
6896 int total_nodes, total_bytes;
6899 fprintf (stderr, "\n??? tree nodes created\n\n");
6900 #ifdef GATHER_STATISTICS
6901 fprintf (stderr, "Kind Nodes Bytes\n");
6902 fprintf (stderr, "---------------------------------------\n");
6903 total_nodes = total_bytes = 0;
6904 for (i = 0; i < (int) all_kinds; i++)
6906 fprintf (stderr, "%-20s %7d %10d\n", tree_node_kind_names[i],
6907 tree_node_counts[i], tree_node_sizes[i]);
6908 total_nodes += tree_node_counts[i];
6909 total_bytes += tree_node_sizes[i];
6911 fprintf (stderr, "---------------------------------------\n");
6912 fprintf (stderr, "%-20s %7d %10d\n", "Total", total_nodes, total_bytes);
6913 fprintf (stderr, "---------------------------------------\n");
6914 ssanames_print_statistics ();
6915 phinodes_print_statistics ();
6917 fprintf (stderr, "(No per-node statistics)\n");
6919 print_type_hash_statistics ();
6920 print_debug_expr_statistics ();
6921 print_value_expr_statistics ();
6922 print_restrict_base_statistics ();
6923 lang_hooks.print_statistics ();
6926 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
6928 /* Generate a crc32 of a string. */
6931 crc32_string (unsigned chksum, const char *string)
6935 unsigned value = *string << 24;
6938 for (ix = 8; ix--; value <<= 1)
6942 feedback = (value ^ chksum) & 0x80000000 ? 0x04c11db7 : 0;
6951 /* P is a string that will be used in a symbol. Mask out any characters
6952 that are not valid in that context. */
6955 clean_symbol_name (char *p)
6959 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
6962 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
6969 /* Generate a name for a special-purpose function function.
6970 The generated name may need to be unique across the whole link.
6971 TYPE is some string to identify the purpose of this function to the
6972 linker or collect2; it must start with an uppercase letter,
6974 I - for constructors
6976 N - for C++ anonymous namespaces
6977 F - for DWARF unwind frame information. */
6980 get_file_function_name (const char *type)
6986 /* If we already have a name we know to be unique, just use that. */
6987 if (first_global_object_name)
6988 p = q = ASTRDUP (first_global_object_name);
6989 /* If the target is handling the constructors/destructors, they
6990 will be local to this file and the name is only necessary for
6991 debugging purposes. */
6992 else if ((type[0] == 'I' || type[0] == 'D') && targetm.have_ctors_dtors)
6994 const char *file = main_input_filename;
6996 file = input_filename;
6997 /* Just use the file's basename, because the full pathname
6998 might be quite long. */
6999 p = strrchr (file, '/');
7004 p = q = ASTRDUP (p);
7008 /* Otherwise, the name must be unique across the entire link.
7009 We don't have anything that we know to be unique to this translation
7010 unit, so use what we do have and throw in some randomness. */
7012 const char *name = weak_global_object_name;
7013 const char *file = main_input_filename;
7018 file = input_filename;
7020 len = strlen (file);
7021 q = (char *) alloca (9 * 2 + len + 1);
7022 memcpy (q, file, len + 1);
7024 sprintf (q + len, "_%08X_%08X", crc32_string (0, name),
7025 crc32_string (0, get_random_seed (false)));
7030 clean_symbol_name (q);
7031 buf = (char *) alloca (sizeof (FILE_FUNCTION_FORMAT) + strlen (p)
7034 /* Set up the name of the file-level functions we may need.
7035 Use a global object (which is already required to be unique over
7036 the program) rather than the file name (which imposes extra
7038 sprintf (buf, FILE_FUNCTION_FORMAT, type, p);
7040 return get_identifier (buf);
7043 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
7045 /* Complain that the tree code of NODE does not match the expected 0
7046 terminated list of trailing codes. The trailing code list can be
7047 empty, for a more vague error message. FILE, LINE, and FUNCTION
7048 are of the caller. */
7051 tree_check_failed (const_tree node, const char *file,
7052 int line, const char *function, ...)
7056 unsigned length = 0;
7059 va_start (args, function);
7060 while ((code = va_arg (args, int)))
7061 length += 4 + strlen (tree_code_name[code]);
7066 va_start (args, function);
7067 length += strlen ("expected ");
7068 buffer = tmp = (char *) alloca (length);
7070 while ((code = va_arg (args, int)))
7072 const char *prefix = length ? " or " : "expected ";
7074 strcpy (tmp + length, prefix);
7075 length += strlen (prefix);
7076 strcpy (tmp + length, tree_code_name[code]);
7077 length += strlen (tree_code_name[code]);
7082 buffer = "unexpected node";
7084 internal_error ("tree check: %s, have %s in %s, at %s:%d",
7085 buffer, tree_code_name[TREE_CODE (node)],
7086 function, trim_filename (file), line);
7089 /* Complain that the tree code of NODE does match the expected 0
7090 terminated list of trailing codes. FILE, LINE, and FUNCTION are of
7094 tree_not_check_failed (const_tree node, const char *file,
7095 int line, const char *function, ...)
7099 unsigned length = 0;
7102 va_start (args, function);
7103 while ((code = va_arg (args, int)))
7104 length += 4 + strlen (tree_code_name[code]);
7106 va_start (args, function);
7107 buffer = (char *) alloca (length);
7109 while ((code = va_arg (args, int)))
7113 strcpy (buffer + length, " or ");
7116 strcpy (buffer + length, tree_code_name[code]);
7117 length += strlen (tree_code_name[code]);
7121 internal_error ("tree check: expected none of %s, have %s in %s, at %s:%d",
7122 buffer, tree_code_name[TREE_CODE (node)],
7123 function, trim_filename (file), line);
7126 /* Similar to tree_check_failed, except that we check for a class of tree
7127 code, given in CL. */
7130 tree_class_check_failed (const_tree node, const enum tree_code_class cl,
7131 const char *file, int line, const char *function)
7134 ("tree check: expected class %qs, have %qs (%s) in %s, at %s:%d",
7135 TREE_CODE_CLASS_STRING (cl),
7136 TREE_CODE_CLASS_STRING (TREE_CODE_CLASS (TREE_CODE (node))),
7137 tree_code_name[TREE_CODE (node)], function, trim_filename (file), line);
7140 /* Similar to tree_check_failed, except that instead of specifying a
7141 dozen codes, use the knowledge that they're all sequential. */
7144 tree_range_check_failed (const_tree node, const char *file, int line,
7145 const char *function, enum tree_code c1,
7149 unsigned length = 0;
7152 for (c = c1; c <= c2; ++c)
7153 length += 4 + strlen (tree_code_name[c]);
7155 length += strlen ("expected ");
7156 buffer = (char *) alloca (length);
7159 for (c = c1; c <= c2; ++c)
7161 const char *prefix = length ? " or " : "expected ";
7163 strcpy (buffer + length, prefix);
7164 length += strlen (prefix);
7165 strcpy (buffer + length, tree_code_name[c]);
7166 length += strlen (tree_code_name[c]);
7169 internal_error ("tree check: %s, have %s in %s, at %s:%d",
7170 buffer, tree_code_name[TREE_CODE (node)],
7171 function, trim_filename (file), line);
7175 /* Similar to tree_check_failed, except that we check that a tree does
7176 not have the specified code, given in CL. */
7179 tree_not_class_check_failed (const_tree node, const enum tree_code_class cl,
7180 const char *file, int line, const char *function)
7183 ("tree check: did not expect class %qs, have %qs (%s) in %s, at %s:%d",
7184 TREE_CODE_CLASS_STRING (cl),
7185 TREE_CODE_CLASS_STRING (TREE_CODE_CLASS (TREE_CODE (node))),
7186 tree_code_name[TREE_CODE (node)], function, trim_filename (file), line);
7190 /* Similar to tree_check_failed but applied to OMP_CLAUSE codes. */
7193 omp_clause_check_failed (const_tree node, const char *file, int line,
7194 const char *function, enum omp_clause_code code)
7196 internal_error ("tree check: expected omp_clause %s, have %s in %s, at %s:%d",
7197 omp_clause_code_name[code], tree_code_name[TREE_CODE (node)],
7198 function, trim_filename (file), line);
7202 /* Similar to tree_range_check_failed but applied to OMP_CLAUSE codes. */
7205 omp_clause_range_check_failed (const_tree node, const char *file, int line,
7206 const char *function, enum omp_clause_code c1,
7207 enum omp_clause_code c2)
7210 unsigned length = 0;
7213 for (c = c1; c <= c2; ++c)
7214 length += 4 + strlen (omp_clause_code_name[c]);
7216 length += strlen ("expected ");
7217 buffer = (char *) alloca (length);
7220 for (c = c1; c <= c2; ++c)
7222 const char *prefix = length ? " or " : "expected ";
7224 strcpy (buffer + length, prefix);
7225 length += strlen (prefix);
7226 strcpy (buffer + length, omp_clause_code_name[c]);
7227 length += strlen (omp_clause_code_name[c]);
7230 internal_error ("tree check: %s, have %s in %s, at %s:%d",
7231 buffer, omp_clause_code_name[TREE_CODE (node)],
7232 function, trim_filename (file), line);
7236 #undef DEFTREESTRUCT
7237 #define DEFTREESTRUCT(VAL, NAME) NAME,
7239 static const char *ts_enum_names[] = {
7240 #include "treestruct.def"
7242 #undef DEFTREESTRUCT
7244 #define TS_ENUM_NAME(EN) (ts_enum_names[(EN)])
7246 /* Similar to tree_class_check_failed, except that we check for
7247 whether CODE contains the tree structure identified by EN. */
7250 tree_contains_struct_check_failed (const_tree node,
7251 const enum tree_node_structure_enum en,
7252 const char *file, int line,
7253 const char *function)
7256 ("tree check: expected tree that contains %qs structure, have %qs in %s, at %s:%d",
7258 tree_code_name[TREE_CODE (node)], function, trim_filename (file), line);
7262 /* Similar to above, except that the check is for the bounds of a TREE_VEC's
7263 (dynamically sized) vector. */
7266 tree_vec_elt_check_failed (int idx, int len, const char *file, int line,
7267 const char *function)
7270 ("tree check: accessed elt %d of tree_vec with %d elts in %s, at %s:%d",
7271 idx + 1, len, function, trim_filename (file), line);
7274 /* Similar to above, except that the check is for the bounds of the operand
7275 vector of an expression node EXP. */
7278 tree_operand_check_failed (int idx, const_tree exp, const char *file,
7279 int line, const char *function)
7281 int code = TREE_CODE (exp);
7283 ("tree check: accessed operand %d of %s with %d operands in %s, at %s:%d",
7284 idx + 1, tree_code_name[code], TREE_OPERAND_LENGTH (exp),
7285 function, trim_filename (file), line);
7288 /* Similar to above, except that the check is for the number of
7289 operands of an OMP_CLAUSE node. */
7292 omp_clause_operand_check_failed (int idx, const_tree t, const char *file,
7293 int line, const char *function)
7296 ("tree check: accessed operand %d of omp_clause %s with %d operands "
7297 "in %s, at %s:%d", idx + 1, omp_clause_code_name[OMP_CLAUSE_CODE (t)],
7298 omp_clause_num_ops [OMP_CLAUSE_CODE (t)], function,
7299 trim_filename (file), line);
7301 #endif /* ENABLE_TREE_CHECKING */
7303 /* Create a new vector type node holding SUBPARTS units of type INNERTYPE,
7304 and mapped to the machine mode MODE. Initialize its fields and build
7305 the information necessary for debugging output. */
7308 make_vector_type (tree innertype, int nunits, enum machine_mode mode)
7311 hashval_t hashcode = 0;
7313 /* Build a main variant, based on the main variant of the inner type, then
7314 use it to build the variant we return. */
7315 if ((TYPE_ATTRIBUTES (innertype) || TYPE_QUALS (innertype))
7316 && TYPE_MAIN_VARIANT (innertype) != innertype)
7317 return build_type_attribute_qual_variant (
7318 make_vector_type (TYPE_MAIN_VARIANT (innertype), nunits, mode),
7319 TYPE_ATTRIBUTES (innertype),
7320 TYPE_QUALS (innertype));
7322 t = make_node (VECTOR_TYPE);
7323 TREE_TYPE (t) = TYPE_MAIN_VARIANT (innertype);
7324 SET_TYPE_VECTOR_SUBPARTS (t, nunits);
7325 SET_TYPE_MODE (t, mode);
7326 TYPE_READONLY (t) = TYPE_READONLY (innertype);
7327 TYPE_VOLATILE (t) = TYPE_VOLATILE (innertype);
7329 if (TYPE_STRUCTURAL_EQUALITY_P (innertype))
7330 SET_TYPE_STRUCTURAL_EQUALITY (t);
7331 else if (TYPE_CANONICAL (innertype) != innertype
7332 || mode != VOIDmode)
7334 = make_vector_type (TYPE_CANONICAL (innertype), nunits, VOIDmode);
7339 tree index = build_int_cst (NULL_TREE, nunits - 1);
7340 tree array = build_array_type (innertype, build_index_type (index));
7341 tree rt = make_node (RECORD_TYPE);
7343 TYPE_FIELDS (rt) = build_decl (FIELD_DECL, get_identifier ("f"), array);
7344 DECL_CONTEXT (TYPE_FIELDS (rt)) = rt;
7346 TYPE_DEBUG_REPRESENTATION_TYPE (t) = rt;
7347 /* In dwarfout.c, type lookup uses TYPE_UID numbers. We want to output
7348 the representation type, and we want to find that die when looking up
7349 the vector type. This is most easily achieved by making the TYPE_UID
7351 TYPE_UID (rt) = TYPE_UID (t);
7354 hashcode = iterative_hash_host_wide_int (VECTOR_TYPE, hashcode);
7355 hashcode = iterative_hash_host_wide_int (mode, hashcode);
7356 hashcode = iterative_hash_object (TYPE_HASH (innertype), hashcode);
7357 return type_hash_canon (hashcode, t);
7361 make_or_reuse_type (unsigned size, int unsignedp)
7363 if (size == INT_TYPE_SIZE)
7364 return unsignedp ? unsigned_type_node : integer_type_node;
7365 if (size == CHAR_TYPE_SIZE)
7366 return unsignedp ? unsigned_char_type_node : signed_char_type_node;
7367 if (size == SHORT_TYPE_SIZE)
7368 return unsignedp ? short_unsigned_type_node : short_integer_type_node;
7369 if (size == LONG_TYPE_SIZE)
7370 return unsignedp ? long_unsigned_type_node : long_integer_type_node;
7371 if (size == LONG_LONG_TYPE_SIZE)
7372 return (unsignedp ? long_long_unsigned_type_node
7373 : long_long_integer_type_node);
7376 return make_unsigned_type (size);
7378 return make_signed_type (size);
7381 /* Create or reuse a fract type by SIZE, UNSIGNEDP, and SATP. */
7384 make_or_reuse_fract_type (unsigned size, int unsignedp, int satp)
7388 if (size == SHORT_FRACT_TYPE_SIZE)
7389 return unsignedp ? sat_unsigned_short_fract_type_node
7390 : sat_short_fract_type_node;
7391 if (size == FRACT_TYPE_SIZE)
7392 return unsignedp ? sat_unsigned_fract_type_node : sat_fract_type_node;
7393 if (size == LONG_FRACT_TYPE_SIZE)
7394 return unsignedp ? sat_unsigned_long_fract_type_node
7395 : sat_long_fract_type_node;
7396 if (size == LONG_LONG_FRACT_TYPE_SIZE)
7397 return unsignedp ? sat_unsigned_long_long_fract_type_node
7398 : sat_long_long_fract_type_node;
7402 if (size == SHORT_FRACT_TYPE_SIZE)
7403 return unsignedp ? unsigned_short_fract_type_node
7404 : short_fract_type_node;
7405 if (size == FRACT_TYPE_SIZE)
7406 return unsignedp ? unsigned_fract_type_node : fract_type_node;
7407 if (size == LONG_FRACT_TYPE_SIZE)
7408 return unsignedp ? unsigned_long_fract_type_node
7409 : long_fract_type_node;
7410 if (size == LONG_LONG_FRACT_TYPE_SIZE)
7411 return unsignedp ? unsigned_long_long_fract_type_node
7412 : long_long_fract_type_node;
7415 return make_fract_type (size, unsignedp, satp);
7418 /* Create or reuse an accum type by SIZE, UNSIGNEDP, and SATP. */
7421 make_or_reuse_accum_type (unsigned size, int unsignedp, int satp)
7425 if (size == SHORT_ACCUM_TYPE_SIZE)
7426 return unsignedp ? sat_unsigned_short_accum_type_node
7427 : sat_short_accum_type_node;
7428 if (size == ACCUM_TYPE_SIZE)
7429 return unsignedp ? sat_unsigned_accum_type_node : sat_accum_type_node;
7430 if (size == LONG_ACCUM_TYPE_SIZE)
7431 return unsignedp ? sat_unsigned_long_accum_type_node
7432 : sat_long_accum_type_node;
7433 if (size == LONG_LONG_ACCUM_TYPE_SIZE)
7434 return unsignedp ? sat_unsigned_long_long_accum_type_node
7435 : sat_long_long_accum_type_node;
7439 if (size == SHORT_ACCUM_TYPE_SIZE)
7440 return unsignedp ? unsigned_short_accum_type_node
7441 : short_accum_type_node;
7442 if (size == ACCUM_TYPE_SIZE)
7443 return unsignedp ? unsigned_accum_type_node : accum_type_node;
7444 if (size == LONG_ACCUM_TYPE_SIZE)
7445 return unsignedp ? unsigned_long_accum_type_node
7446 : long_accum_type_node;
7447 if (size == LONG_LONG_ACCUM_TYPE_SIZE)
7448 return unsignedp ? unsigned_long_long_accum_type_node
7449 : long_long_accum_type_node;
7452 return make_accum_type (size, unsignedp, satp);
7455 /* Create nodes for all integer types (and error_mark_node) using the sizes
7456 of C datatypes. The caller should call set_sizetype soon after calling
7457 this function to select one of the types as sizetype. */
7460 build_common_tree_nodes (bool signed_char, bool signed_sizetype)
7462 error_mark_node = make_node (ERROR_MARK);
7463 TREE_TYPE (error_mark_node) = error_mark_node;
7465 initialize_sizetypes (signed_sizetype);
7467 /* Define both `signed char' and `unsigned char'. */
7468 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
7469 TYPE_STRING_FLAG (signed_char_type_node) = 1;
7470 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
7471 TYPE_STRING_FLAG (unsigned_char_type_node) = 1;
7473 /* Define `char', which is like either `signed char' or `unsigned char'
7474 but not the same as either. */
7477 ? make_signed_type (CHAR_TYPE_SIZE)
7478 : make_unsigned_type (CHAR_TYPE_SIZE));
7479 TYPE_STRING_FLAG (char_type_node) = 1;
7481 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
7482 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
7483 integer_type_node = make_signed_type (INT_TYPE_SIZE);
7484 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
7485 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
7486 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
7487 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
7488 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
7490 /* Define a boolean type. This type only represents boolean values but
7491 may be larger than char depending on the value of BOOL_TYPE_SIZE.
7492 Front ends which want to override this size (i.e. Java) can redefine
7493 boolean_type_node before calling build_common_tree_nodes_2. */
7494 boolean_type_node = make_unsigned_type (BOOL_TYPE_SIZE);
7495 TREE_SET_CODE (boolean_type_node, BOOLEAN_TYPE);
7496 TYPE_MAX_VALUE (boolean_type_node) = build_int_cst (boolean_type_node, 1);
7497 TYPE_PRECISION (boolean_type_node) = 1;
7499 /* Fill in the rest of the sized types. Reuse existing type nodes
7501 intQI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (QImode), 0);
7502 intHI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (HImode), 0);
7503 intSI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (SImode), 0);
7504 intDI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (DImode), 0);
7505 intTI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (TImode), 0);
7507 unsigned_intQI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (QImode), 1);
7508 unsigned_intHI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (HImode), 1);
7509 unsigned_intSI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (SImode), 1);
7510 unsigned_intDI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (DImode), 1);
7511 unsigned_intTI_type_node = make_or_reuse_type (GET_MODE_BITSIZE (TImode), 1);
7513 access_public_node = get_identifier ("public");
7514 access_protected_node = get_identifier ("protected");
7515 access_private_node = get_identifier ("private");
7518 /* Call this function after calling build_common_tree_nodes and set_sizetype.
7519 It will create several other common tree nodes. */
7522 build_common_tree_nodes_2 (int short_double)
7524 /* Define these next since types below may used them. */
7525 integer_zero_node = build_int_cst (NULL_TREE, 0);
7526 integer_one_node = build_int_cst (NULL_TREE, 1);
7527 integer_minus_one_node = build_int_cst (NULL_TREE, -1);
7529 size_zero_node = size_int (0);
7530 size_one_node = size_int (1);
7531 bitsize_zero_node = bitsize_int (0);
7532 bitsize_one_node = bitsize_int (1);
7533 bitsize_unit_node = bitsize_int (BITS_PER_UNIT);
7535 boolean_false_node = TYPE_MIN_VALUE (boolean_type_node);
7536 boolean_true_node = TYPE_MAX_VALUE (boolean_type_node);
7538 void_type_node = make_node (VOID_TYPE);
7539 layout_type (void_type_node);
7541 /* We are not going to have real types in C with less than byte alignment,
7542 so we might as well not have any types that claim to have it. */
7543 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
7544 TYPE_USER_ALIGN (void_type_node) = 0;
7546 null_pointer_node = build_int_cst (build_pointer_type (void_type_node), 0);
7547 layout_type (TREE_TYPE (null_pointer_node));
7549 ptr_type_node = build_pointer_type (void_type_node);
7551 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
7552 fileptr_type_node = ptr_type_node;
7554 float_type_node = make_node (REAL_TYPE);
7555 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
7556 layout_type (float_type_node);
7558 double_type_node = make_node (REAL_TYPE);
7560 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
7562 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
7563 layout_type (double_type_node);
7565 long_double_type_node = make_node (REAL_TYPE);
7566 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
7567 layout_type (long_double_type_node);
7569 float_ptr_type_node = build_pointer_type (float_type_node);
7570 double_ptr_type_node = build_pointer_type (double_type_node);
7571 long_double_ptr_type_node = build_pointer_type (long_double_type_node);
7572 integer_ptr_type_node = build_pointer_type (integer_type_node);
7574 /* Fixed size integer types. */
7575 uint32_type_node = build_nonstandard_integer_type (32, true);
7576 uint64_type_node = build_nonstandard_integer_type (64, true);
7578 /* Decimal float types. */
7579 dfloat32_type_node = make_node (REAL_TYPE);
7580 TYPE_PRECISION (dfloat32_type_node) = DECIMAL32_TYPE_SIZE;
7581 layout_type (dfloat32_type_node);
7582 SET_TYPE_MODE (dfloat32_type_node, SDmode);
7583 dfloat32_ptr_type_node = build_pointer_type (dfloat32_type_node);
7585 dfloat64_type_node = make_node (REAL_TYPE);
7586 TYPE_PRECISION (dfloat64_type_node) = DECIMAL64_TYPE_SIZE;
7587 layout_type (dfloat64_type_node);
7588 SET_TYPE_MODE (dfloat64_type_node, DDmode);
7589 dfloat64_ptr_type_node = build_pointer_type (dfloat64_type_node);
7591 dfloat128_type_node = make_node (REAL_TYPE);
7592 TYPE_PRECISION (dfloat128_type_node) = DECIMAL128_TYPE_SIZE;
7593 layout_type (dfloat128_type_node);
7594 SET_TYPE_MODE (dfloat128_type_node, TDmode);
7595 dfloat128_ptr_type_node = build_pointer_type (dfloat128_type_node);
7597 complex_integer_type_node = build_complex_type (integer_type_node);
7598 complex_float_type_node = build_complex_type (float_type_node);
7599 complex_double_type_node = build_complex_type (double_type_node);
7600 complex_long_double_type_node = build_complex_type (long_double_type_node);
7602 /* Make fixed-point nodes based on sat/non-sat and signed/unsigned. */
7603 #define MAKE_FIXED_TYPE_NODE(KIND,SIZE) \
7604 sat_ ## KIND ## _type_node = \
7605 make_sat_signed_ ## KIND ## _type (SIZE); \
7606 sat_unsigned_ ## KIND ## _type_node = \
7607 make_sat_unsigned_ ## KIND ## _type (SIZE); \
7608 KIND ## _type_node = make_signed_ ## KIND ## _type (SIZE); \
7609 unsigned_ ## KIND ## _type_node = \
7610 make_unsigned_ ## KIND ## _type (SIZE);
7612 #define MAKE_FIXED_TYPE_NODE_WIDTH(KIND,WIDTH,SIZE) \
7613 sat_ ## WIDTH ## KIND ## _type_node = \
7614 make_sat_signed_ ## KIND ## _type (SIZE); \
7615 sat_unsigned_ ## WIDTH ## KIND ## _type_node = \
7616 make_sat_unsigned_ ## KIND ## _type (SIZE); \
7617 WIDTH ## KIND ## _type_node = make_signed_ ## KIND ## _type (SIZE); \
7618 unsigned_ ## WIDTH ## KIND ## _type_node = \
7619 make_unsigned_ ## KIND ## _type (SIZE);
7621 /* Make fixed-point type nodes based on four different widths. */
7622 #define MAKE_FIXED_TYPE_NODE_FAMILY(N1,N2) \
7623 MAKE_FIXED_TYPE_NODE_WIDTH (N1, short_, SHORT_ ## N2 ## _TYPE_SIZE) \
7624 MAKE_FIXED_TYPE_NODE (N1, N2 ## _TYPE_SIZE) \
7625 MAKE_FIXED_TYPE_NODE_WIDTH (N1, long_, LONG_ ## N2 ## _TYPE_SIZE) \
7626 MAKE_FIXED_TYPE_NODE_WIDTH (N1, long_long_, LONG_LONG_ ## N2 ## _TYPE_SIZE)
7628 /* Make fixed-point mode nodes based on sat/non-sat and signed/unsigned. */
7629 #define MAKE_FIXED_MODE_NODE(KIND,NAME,MODE) \
7630 NAME ## _type_node = \
7631 make_or_reuse_signed_ ## KIND ## _type (GET_MODE_BITSIZE (MODE ## mode)); \
7632 u ## NAME ## _type_node = \
7633 make_or_reuse_unsigned_ ## KIND ## _type \
7634 (GET_MODE_BITSIZE (U ## MODE ## mode)); \
7635 sat_ ## NAME ## _type_node = \
7636 make_or_reuse_sat_signed_ ## KIND ## _type \
7637 (GET_MODE_BITSIZE (MODE ## mode)); \
7638 sat_u ## NAME ## _type_node = \
7639 make_or_reuse_sat_unsigned_ ## KIND ## _type \
7640 (GET_MODE_BITSIZE (U ## MODE ## mode));
7642 /* Fixed-point type and mode nodes. */
7643 MAKE_FIXED_TYPE_NODE_FAMILY (fract, FRACT)
7644 MAKE_FIXED_TYPE_NODE_FAMILY (accum, ACCUM)
7645 MAKE_FIXED_MODE_NODE (fract, qq, QQ)
7646 MAKE_FIXED_MODE_NODE (fract, hq, HQ)
7647 MAKE_FIXED_MODE_NODE (fract, sq, SQ)
7648 MAKE_FIXED_MODE_NODE (fract, dq, DQ)
7649 MAKE_FIXED_MODE_NODE (fract, tq, TQ)
7650 MAKE_FIXED_MODE_NODE (accum, ha, HA)
7651 MAKE_FIXED_MODE_NODE (accum, sa, SA)
7652 MAKE_FIXED_MODE_NODE (accum, da, DA)
7653 MAKE_FIXED_MODE_NODE (accum, ta, TA)
7656 tree t = targetm.build_builtin_va_list ();
7658 /* Many back-ends define record types without setting TYPE_NAME.
7659 If we copied the record type here, we'd keep the original
7660 record type without a name. This breaks name mangling. So,
7661 don't copy record types and let c_common_nodes_and_builtins()
7662 declare the type to be __builtin_va_list. */
7663 if (TREE_CODE (t) != RECORD_TYPE)
7664 t = build_variant_type_copy (t);
7666 va_list_type_node = t;
7670 /* A subroutine of build_common_builtin_nodes. Define a builtin function. */
7673 local_define_builtin (const char *name, tree type, enum built_in_function code,
7674 const char *library_name, int ecf_flags)
7678 decl = add_builtin_function (name, type, code, BUILT_IN_NORMAL,
7679 library_name, NULL_TREE);
7680 if (ecf_flags & ECF_CONST)
7681 TREE_READONLY (decl) = 1;
7682 if (ecf_flags & ECF_PURE)
7683 DECL_PURE_P (decl) = 1;
7684 if (ecf_flags & ECF_LOOPING_CONST_OR_PURE)
7685 DECL_LOOPING_CONST_OR_PURE_P (decl) = 1;
7686 if (ecf_flags & ECF_NORETURN)
7687 TREE_THIS_VOLATILE (decl) = 1;
7688 if (ecf_flags & ECF_NOTHROW)
7689 TREE_NOTHROW (decl) = 1;
7690 if (ecf_flags & ECF_MALLOC)
7691 DECL_IS_MALLOC (decl) = 1;
7693 built_in_decls[code] = decl;
7694 implicit_built_in_decls[code] = decl;
7697 /* Call this function after instantiating all builtins that the language
7698 front end cares about. This will build the rest of the builtins that
7699 are relied upon by the tree optimizers and the middle-end. */
7702 build_common_builtin_nodes (void)
7706 if (built_in_decls[BUILT_IN_MEMCPY] == NULL
7707 || built_in_decls[BUILT_IN_MEMMOVE] == NULL)
7709 tmp = tree_cons (NULL_TREE, size_type_node, void_list_node);
7710 tmp = tree_cons (NULL_TREE, const_ptr_type_node, tmp);
7711 tmp = tree_cons (NULL_TREE, ptr_type_node, tmp);
7712 ftype = build_function_type (ptr_type_node, tmp);
7714 if (built_in_decls[BUILT_IN_MEMCPY] == NULL)
7715 local_define_builtin ("__builtin_memcpy", ftype, BUILT_IN_MEMCPY,
7716 "memcpy", ECF_NOTHROW);
7717 if (built_in_decls[BUILT_IN_MEMMOVE] == NULL)
7718 local_define_builtin ("__builtin_memmove", ftype, BUILT_IN_MEMMOVE,
7719 "memmove", ECF_NOTHROW);
7722 if (built_in_decls[BUILT_IN_MEMCMP] == NULL)
7724 tmp = tree_cons (NULL_TREE, size_type_node, void_list_node);
7725 tmp = tree_cons (NULL_TREE, const_ptr_type_node, tmp);
7726 tmp = tree_cons (NULL_TREE, const_ptr_type_node, tmp);
7727 ftype = build_function_type (integer_type_node, tmp);
7728 local_define_builtin ("__builtin_memcmp", ftype, BUILT_IN_MEMCMP,
7729 "memcmp", ECF_PURE | ECF_NOTHROW);
7732 if (built_in_decls[BUILT_IN_MEMSET] == NULL)
7734 tmp = tree_cons (NULL_TREE, size_type_node, void_list_node);
7735 tmp = tree_cons (NULL_TREE, integer_type_node, tmp);
7736 tmp = tree_cons (NULL_TREE, ptr_type_node, tmp);
7737 ftype = build_function_type (ptr_type_node, tmp);
7738 local_define_builtin ("__builtin_memset", ftype, BUILT_IN_MEMSET,
7739 "memset", ECF_NOTHROW);
7742 if (built_in_decls[BUILT_IN_ALLOCA] == NULL)
7744 tmp = tree_cons (NULL_TREE, size_type_node, void_list_node);
7745 ftype = build_function_type (ptr_type_node, tmp);
7746 local_define_builtin ("__builtin_alloca", ftype, BUILT_IN_ALLOCA,
7747 "alloca", ECF_NOTHROW | ECF_MALLOC);
7750 tmp = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
7751 tmp = tree_cons (NULL_TREE, ptr_type_node, tmp);
7752 tmp = tree_cons (NULL_TREE, ptr_type_node, tmp);
7753 ftype = build_function_type (void_type_node, tmp);
7754 local_define_builtin ("__builtin_init_trampoline", ftype,
7755 BUILT_IN_INIT_TRAMPOLINE,
7756 "__builtin_init_trampoline", ECF_NOTHROW);
7758 tmp = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
7759 ftype = build_function_type (ptr_type_node, tmp);
7760 local_define_builtin ("__builtin_adjust_trampoline", ftype,
7761 BUILT_IN_ADJUST_TRAMPOLINE,
7762 "__builtin_adjust_trampoline",
7763 ECF_CONST | ECF_NOTHROW);
7765 tmp = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
7766 tmp = tree_cons (NULL_TREE, ptr_type_node, tmp);
7767 ftype = build_function_type (void_type_node, tmp);
7768 local_define_builtin ("__builtin_nonlocal_goto", ftype,
7769 BUILT_IN_NONLOCAL_GOTO,
7770 "__builtin_nonlocal_goto",
7771 ECF_NORETURN | ECF_NOTHROW);
7773 tmp = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
7774 tmp = tree_cons (NULL_TREE, ptr_type_node, tmp);
7775 ftype = build_function_type (void_type_node, tmp);
7776 local_define_builtin ("__builtin_setjmp_setup", ftype,
7777 BUILT_IN_SETJMP_SETUP,
7778 "__builtin_setjmp_setup", ECF_NOTHROW);
7780 tmp = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
7781 ftype = build_function_type (ptr_type_node, tmp);
7782 local_define_builtin ("__builtin_setjmp_dispatcher", ftype,
7783 BUILT_IN_SETJMP_DISPATCHER,
7784 "__builtin_setjmp_dispatcher",
7785 ECF_PURE | ECF_NOTHROW);
7787 tmp = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
7788 ftype = build_function_type (void_type_node, tmp);
7789 local_define_builtin ("__builtin_setjmp_receiver", ftype,
7790 BUILT_IN_SETJMP_RECEIVER,
7791 "__builtin_setjmp_receiver", ECF_NOTHROW);
7793 ftype = build_function_type (ptr_type_node, void_list_node);
7794 local_define_builtin ("__builtin_stack_save", ftype, BUILT_IN_STACK_SAVE,
7795 "__builtin_stack_save", ECF_NOTHROW);
7797 tmp = tree_cons (NULL_TREE, ptr_type_node, void_list_node);
7798 ftype = build_function_type (void_type_node, tmp);
7799 local_define_builtin ("__builtin_stack_restore", ftype,
7800 BUILT_IN_STACK_RESTORE,
7801 "__builtin_stack_restore", ECF_NOTHROW);
7803 ftype = build_function_type (void_type_node, void_list_node);
7804 local_define_builtin ("__builtin_profile_func_enter", ftype,
7805 BUILT_IN_PROFILE_FUNC_ENTER, "profile_func_enter", 0);
7806 local_define_builtin ("__builtin_profile_func_exit", ftype,
7807 BUILT_IN_PROFILE_FUNC_EXIT, "profile_func_exit", 0);
7809 /* Complex multiplication and division. These are handled as builtins
7810 rather than optabs because emit_library_call_value doesn't support
7811 complex. Further, we can do slightly better with folding these
7812 beasties if the real and complex parts of the arguments are separate. */
7816 for (mode = MIN_MODE_COMPLEX_FLOAT; mode <= MAX_MODE_COMPLEX_FLOAT; ++mode)
7818 char mode_name_buf[4], *q;
7820 enum built_in_function mcode, dcode;
7821 tree type, inner_type;
7823 type = lang_hooks.types.type_for_mode ((enum machine_mode) mode, 0);
7826 inner_type = TREE_TYPE (type);
7828 tmp = tree_cons (NULL_TREE, inner_type, void_list_node);
7829 tmp = tree_cons (NULL_TREE, inner_type, tmp);
7830 tmp = tree_cons (NULL_TREE, inner_type, tmp);
7831 tmp = tree_cons (NULL_TREE, inner_type, tmp);
7832 ftype = build_function_type (type, tmp);
7834 mcode = ((enum built_in_function)
7835 (BUILT_IN_COMPLEX_MUL_MIN + mode - MIN_MODE_COMPLEX_FLOAT));
7836 dcode = ((enum built_in_function)
7837 (BUILT_IN_COMPLEX_DIV_MIN + mode - MIN_MODE_COMPLEX_FLOAT));
7839 for (p = GET_MODE_NAME (mode), q = mode_name_buf; *p; p++, q++)
7843 built_in_names[mcode] = concat ("__mul", mode_name_buf, "3", NULL);
7844 local_define_builtin (built_in_names[mcode], ftype, mcode,
7845 built_in_names[mcode], ECF_CONST | ECF_NOTHROW);
7847 built_in_names[dcode] = concat ("__div", mode_name_buf, "3", NULL);
7848 local_define_builtin (built_in_names[dcode], ftype, dcode,
7849 built_in_names[dcode], ECF_CONST | ECF_NOTHROW);
7854 /* HACK. GROSS. This is absolutely disgusting. I wish there was a
7857 If we requested a pointer to a vector, build up the pointers that
7858 we stripped off while looking for the inner type. Similarly for
7859 return values from functions.
7861 The argument TYPE is the top of the chain, and BOTTOM is the
7862 new type which we will point to. */
7865 reconstruct_complex_type (tree type, tree bottom)
7869 if (TREE_CODE (type) == POINTER_TYPE)
7871 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
7872 outer = build_pointer_type_for_mode (inner, TYPE_MODE (type),
7873 TYPE_REF_CAN_ALIAS_ALL (type));
7875 else if (TREE_CODE (type) == REFERENCE_TYPE)
7877 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
7878 outer = build_reference_type_for_mode (inner, TYPE_MODE (type),
7879 TYPE_REF_CAN_ALIAS_ALL (type));
7881 else if (TREE_CODE (type) == ARRAY_TYPE)
7883 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
7884 outer = build_array_type (inner, TYPE_DOMAIN (type));
7886 else if (TREE_CODE (type) == FUNCTION_TYPE)
7888 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
7889 outer = build_function_type (inner, TYPE_ARG_TYPES (type));
7891 else if (TREE_CODE (type) == METHOD_TYPE)
7893 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
7894 /* The build_method_type_directly() routine prepends 'this' to argument list,
7895 so we must compensate by getting rid of it. */
7897 = build_method_type_directly
7898 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type))),
7900 TREE_CHAIN (TYPE_ARG_TYPES (type)));
7902 else if (TREE_CODE (type) == OFFSET_TYPE)
7904 inner = reconstruct_complex_type (TREE_TYPE (type), bottom);
7905 outer = build_offset_type (TYPE_OFFSET_BASETYPE (type), inner);
7910 return build_qualified_type (outer, TYPE_QUALS (type));
7913 /* Returns a vector tree node given a mode (integer, vector, or BLKmode) and
7916 build_vector_type_for_mode (tree innertype, enum machine_mode mode)
7920 switch (GET_MODE_CLASS (mode))
7922 case MODE_VECTOR_INT:
7923 case MODE_VECTOR_FLOAT:
7924 case MODE_VECTOR_FRACT:
7925 case MODE_VECTOR_UFRACT:
7926 case MODE_VECTOR_ACCUM:
7927 case MODE_VECTOR_UACCUM:
7928 nunits = GET_MODE_NUNITS (mode);
7932 /* Check that there are no leftover bits. */
7933 gcc_assert (GET_MODE_BITSIZE (mode)
7934 % TREE_INT_CST_LOW (TYPE_SIZE (innertype)) == 0);
7936 nunits = GET_MODE_BITSIZE (mode)
7937 / TREE_INT_CST_LOW (TYPE_SIZE (innertype));
7944 return make_vector_type (innertype, nunits, mode);
7947 /* Similarly, but takes the inner type and number of units, which must be
7951 build_vector_type (tree innertype, int nunits)
7953 return make_vector_type (innertype, nunits, VOIDmode);
7956 /* Similarly, but takes the inner type and number of units, which must be
7960 build_opaque_vector_type (tree innertype, int nunits)
7963 innertype = build_distinct_type_copy (innertype);
7964 t = make_vector_type (innertype, nunits, VOIDmode);
7965 TYPE_VECTOR_OPAQUE (t) = true;
7970 /* Build RESX_EXPR with given REGION_NUMBER. */
7972 build_resx (int region_number)
7975 t = build1 (RESX_EXPR, void_type_node,
7976 build_int_cst (NULL_TREE, region_number));
7980 /* Given an initializer INIT, return TRUE if INIT is zero or some
7981 aggregate of zeros. Otherwise return FALSE. */
7983 initializer_zerop (const_tree init)
7989 switch (TREE_CODE (init))
7992 return integer_zerop (init);
7995 /* ??? Note that this is not correct for C4X float formats. There,
7996 a bit pattern of all zeros is 1.0; 0.0 is encoded with the most
7997 negative exponent. */
7998 return real_zerop (init)
7999 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (init));
8002 return fixed_zerop (init);
8005 return integer_zerop (init)
8006 || (real_zerop (init)
8007 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_REALPART (init)))
8008 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_IMAGPART (init))));
8011 for (elt = TREE_VECTOR_CST_ELTS (init); elt; elt = TREE_CHAIN (elt))
8012 if (!initializer_zerop (TREE_VALUE (elt)))
8018 unsigned HOST_WIDE_INT idx;
8020 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (init), idx, elt)
8021 if (!initializer_zerop (elt))
8031 /* Build an empty statement. */
8034 build_empty_stmt (void)
8036 return build1 (NOP_EXPR, void_type_node, size_zero_node);
8040 /* Build an OpenMP clause with code CODE. */
8043 build_omp_clause (enum omp_clause_code code)
8048 length = omp_clause_num_ops[code];
8049 size = (sizeof (struct tree_omp_clause) + (length - 1) * sizeof (tree));
8051 t = GGC_NEWVAR (union tree_node, size);
8052 memset (t, 0, size);
8053 TREE_SET_CODE (t, OMP_CLAUSE);
8054 OMP_CLAUSE_SET_CODE (t, code);
8056 #ifdef GATHER_STATISTICS
8057 tree_node_counts[(int) omp_clause_kind]++;
8058 tree_node_sizes[(int) omp_clause_kind] += size;
8064 /* Set various status flags when building a CALL_EXPR object T. */
8067 process_call_operands (tree t)
8071 side_effects = TREE_SIDE_EFFECTS (t);
8075 n = TREE_OPERAND_LENGTH (t);
8076 for (i = 1; i < n; i++)
8078 tree op = TREE_OPERAND (t, i);
8079 if (op && TREE_SIDE_EFFECTS (op))
8090 /* Calls have side-effects, except those to const or
8092 i = call_expr_flags (t);
8093 if ((i & ECF_LOOPING_CONST_OR_PURE) || !(i & (ECF_CONST | ECF_PURE)))
8096 TREE_SIDE_EFFECTS (t) = side_effects;
8099 /* Build a tcc_vl_exp object with code CODE and room for LEN operands. LEN
8100 includes the implicit operand count in TREE_OPERAND 0, and so must be >= 1.
8101 Except for the CODE and operand count field, other storage for the
8102 object is initialized to zeros. */
8105 build_vl_exp_stat (enum tree_code code, int len MEM_STAT_DECL)
8108 int length = (len - 1) * sizeof (tree) + sizeof (struct tree_exp);
8110 gcc_assert (TREE_CODE_CLASS (code) == tcc_vl_exp);
8111 gcc_assert (len >= 1);
8113 #ifdef GATHER_STATISTICS
8114 tree_node_counts[(int) e_kind]++;
8115 tree_node_sizes[(int) e_kind] += length;
8118 t = (tree) ggc_alloc_zone_pass_stat (length, &tree_zone);
8120 memset (t, 0, length);
8122 TREE_SET_CODE (t, code);
8124 /* Can't use TREE_OPERAND to store the length because if checking is
8125 enabled, it will try to check the length before we store it. :-P */
8126 t->exp.operands[0] = build_int_cst (sizetype, len);
8132 /* Build a CALL_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE
8133 and FN and a null static chain slot. ARGLIST is a TREE_LIST of the
8137 build_call_list (tree return_type, tree fn, tree arglist)
8142 t = build_vl_exp (CALL_EXPR, list_length (arglist) + 3);
8143 TREE_TYPE (t) = return_type;
8144 CALL_EXPR_FN (t) = fn;
8145 CALL_EXPR_STATIC_CHAIN (t) = NULL_TREE;
8146 for (i = 0; arglist; arglist = TREE_CHAIN (arglist), i++)
8147 CALL_EXPR_ARG (t, i) = TREE_VALUE (arglist);
8148 process_call_operands (t);
8152 /* Build a CALL_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE and
8153 FN and a null static chain slot. NARGS is the number of call arguments
8154 which are specified as "..." arguments. */
8157 build_call_nary (tree return_type, tree fn, int nargs, ...)
8161 va_start (args, nargs);
8162 ret = build_call_valist (return_type, fn, nargs, args);
8167 /* Build a CALL_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE and
8168 FN and a null static chain slot. NARGS is the number of call arguments
8169 which are specified as a va_list ARGS. */
8172 build_call_valist (tree return_type, tree fn, int nargs, va_list args)
8177 t = build_vl_exp (CALL_EXPR, nargs + 3);
8178 TREE_TYPE (t) = return_type;
8179 CALL_EXPR_FN (t) = fn;
8180 CALL_EXPR_STATIC_CHAIN (t) = NULL_TREE;
8181 for (i = 0; i < nargs; i++)
8182 CALL_EXPR_ARG (t, i) = va_arg (args, tree);
8183 process_call_operands (t);
8187 /* Build a CALL_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE and
8188 FN and a null static chain slot. NARGS is the number of call arguments
8189 which are specified as a tree array ARGS. */
8192 build_call_array (tree return_type, tree fn, int nargs, tree *args)
8197 t = build_vl_exp (CALL_EXPR, nargs + 3);
8198 TREE_TYPE (t) = return_type;
8199 CALL_EXPR_FN (t) = fn;
8200 CALL_EXPR_STATIC_CHAIN (t) = NULL_TREE;
8201 for (i = 0; i < nargs; i++)
8202 CALL_EXPR_ARG (t, i) = args[i];
8203 process_call_operands (t);
8208 /* Returns true if it is possible to prove that the index of
8209 an array access REF (an ARRAY_REF expression) falls into the
8213 in_array_bounds_p (tree ref)
8215 tree idx = TREE_OPERAND (ref, 1);
8218 if (TREE_CODE (idx) != INTEGER_CST)
8221 min = array_ref_low_bound (ref);
8222 max = array_ref_up_bound (ref);
8225 || TREE_CODE (min) != INTEGER_CST
8226 || TREE_CODE (max) != INTEGER_CST)
8229 if (tree_int_cst_lt (idx, min)
8230 || tree_int_cst_lt (max, idx))
8236 /* Returns true if it is possible to prove that the range of
8237 an array access REF (an ARRAY_RANGE_REF expression) falls
8238 into the array bounds. */
8241 range_in_array_bounds_p (tree ref)
8243 tree domain_type = TYPE_DOMAIN (TREE_TYPE (ref));
8244 tree range_min, range_max, min, max;
8246 range_min = TYPE_MIN_VALUE (domain_type);
8247 range_max = TYPE_MAX_VALUE (domain_type);
8250 || TREE_CODE (range_min) != INTEGER_CST
8251 || TREE_CODE (range_max) != INTEGER_CST)
8254 min = array_ref_low_bound (ref);
8255 max = array_ref_up_bound (ref);
8258 || TREE_CODE (min) != INTEGER_CST
8259 || TREE_CODE (max) != INTEGER_CST)
8262 if (tree_int_cst_lt (range_min, min)
8263 || tree_int_cst_lt (max, range_max))
8269 /* Return true if T (assumed to be a DECL) must be assigned a memory
8273 needs_to_live_in_memory (const_tree t)
8275 if (TREE_CODE (t) == SSA_NAME)
8276 t = SSA_NAME_VAR (t);
8278 return (TREE_ADDRESSABLE (t)
8279 || is_global_var (t)
8280 || (TREE_CODE (t) == RESULT_DECL
8281 && aggregate_value_p (t, current_function_decl)));
8284 /* There are situations in which a language considers record types
8285 compatible which have different field lists. Decide if two fields
8286 are compatible. It is assumed that the parent records are compatible. */
8289 fields_compatible_p (const_tree f1, const_tree f2)
8291 if (!operand_equal_p (DECL_FIELD_BIT_OFFSET (f1),
8292 DECL_FIELD_BIT_OFFSET (f2), OEP_ONLY_CONST))
8295 if (!operand_equal_p (DECL_FIELD_OFFSET (f1),
8296 DECL_FIELD_OFFSET (f2), OEP_ONLY_CONST))
8299 if (!types_compatible_p (TREE_TYPE (f1), TREE_TYPE (f2)))
8305 /* Locate within RECORD a field that is compatible with ORIG_FIELD. */
8308 find_compatible_field (tree record, tree orig_field)
8312 for (f = TYPE_FIELDS (record); f ; f = TREE_CHAIN (f))
8313 if (TREE_CODE (f) == FIELD_DECL
8314 && fields_compatible_p (f, orig_field))
8317 /* ??? Why isn't this on the main fields list? */
8318 f = TYPE_VFIELD (record);
8319 if (f && TREE_CODE (f) == FIELD_DECL
8320 && fields_compatible_p (f, orig_field))
8323 /* ??? We should abort here, but Java appears to do Bad Things
8324 with inherited fields. */
8328 /* Return value of a constant X and sign-extend it. */
8331 int_cst_value (const_tree x)
8333 unsigned bits = TYPE_PRECISION (TREE_TYPE (x));
8334 unsigned HOST_WIDE_INT val = TREE_INT_CST_LOW (x);
8336 /* Make sure the sign-extended value will fit in a HOST_WIDE_INT. */
8337 gcc_assert (TREE_INT_CST_HIGH (x) == 0
8338 || TREE_INT_CST_HIGH (x) == -1);
8340 if (bits < HOST_BITS_PER_WIDE_INT)
8342 bool negative = ((val >> (bits - 1)) & 1) != 0;
8344 val |= (~(unsigned HOST_WIDE_INT) 0) << (bits - 1) << 1;
8346 val &= ~((~(unsigned HOST_WIDE_INT) 0) << (bits - 1) << 1);
8352 /* If TYPE is an integral type, return an equivalent type which is
8353 unsigned iff UNSIGNEDP is true. If TYPE is not an integral type,
8354 return TYPE itself. */
8357 signed_or_unsigned_type_for (int unsignedp, tree type)
8360 if (POINTER_TYPE_P (type))
8363 if (!INTEGRAL_TYPE_P (t) || TYPE_UNSIGNED (t) == unsignedp)
8366 return lang_hooks.types.type_for_size (TYPE_PRECISION (t), unsignedp);
8369 /* Returns unsigned variant of TYPE. */
8372 unsigned_type_for (tree type)
8374 return signed_or_unsigned_type_for (1, type);
8377 /* Returns signed variant of TYPE. */
8380 signed_type_for (tree type)
8382 return signed_or_unsigned_type_for (0, type);
8385 /* Returns the largest value obtainable by casting something in INNER type to
8389 upper_bound_in_type (tree outer, tree inner)
8391 unsigned HOST_WIDE_INT lo, hi;
8392 unsigned int det = 0;
8393 unsigned oprec = TYPE_PRECISION (outer);
8394 unsigned iprec = TYPE_PRECISION (inner);
8397 /* Compute a unique number for every combination. */
8398 det |= (oprec > iprec) ? 4 : 0;
8399 det |= TYPE_UNSIGNED (outer) ? 2 : 0;
8400 det |= TYPE_UNSIGNED (inner) ? 1 : 0;
8402 /* Determine the exponent to use. */
8407 /* oprec <= iprec, outer: signed, inner: don't care. */
8412 /* oprec <= iprec, outer: unsigned, inner: don't care. */
8416 /* oprec > iprec, outer: signed, inner: signed. */
8420 /* oprec > iprec, outer: signed, inner: unsigned. */
8424 /* oprec > iprec, outer: unsigned, inner: signed. */
8428 /* oprec > iprec, outer: unsigned, inner: unsigned. */
8435 /* Compute 2^^prec - 1. */
8436 if (prec <= HOST_BITS_PER_WIDE_INT)
8439 lo = ((~(unsigned HOST_WIDE_INT) 0)
8440 >> (HOST_BITS_PER_WIDE_INT - prec));
8444 hi = ((~(unsigned HOST_WIDE_INT) 0)
8445 >> (2 * HOST_BITS_PER_WIDE_INT - prec));
8446 lo = ~(unsigned HOST_WIDE_INT) 0;
8449 return build_int_cst_wide (outer, lo, hi);
8452 /* Returns the smallest value obtainable by casting something in INNER type to
8456 lower_bound_in_type (tree outer, tree inner)
8458 unsigned HOST_WIDE_INT lo, hi;
8459 unsigned oprec = TYPE_PRECISION (outer);
8460 unsigned iprec = TYPE_PRECISION (inner);
8462 /* If OUTER type is unsigned, we can definitely cast 0 to OUTER type
8464 if (TYPE_UNSIGNED (outer)
8465 /* If we are widening something of an unsigned type, OUTER type
8466 contains all values of INNER type. In particular, both INNER
8467 and OUTER types have zero in common. */
8468 || (oprec > iprec && TYPE_UNSIGNED (inner)))
8472 /* If we are widening a signed type to another signed type, we
8473 want to obtain -2^^(iprec-1). If we are keeping the
8474 precision or narrowing to a signed type, we want to obtain
8476 unsigned prec = oprec > iprec ? iprec : oprec;
8478 if (prec <= HOST_BITS_PER_WIDE_INT)
8480 hi = ~(unsigned HOST_WIDE_INT) 0;
8481 lo = (~(unsigned HOST_WIDE_INT) 0) << (prec - 1);
8485 hi = ((~(unsigned HOST_WIDE_INT) 0)
8486 << (prec - HOST_BITS_PER_WIDE_INT - 1));
8491 return build_int_cst_wide (outer, lo, hi);
8494 /* Return nonzero if two operands that are suitable for PHI nodes are
8495 necessarily equal. Specifically, both ARG0 and ARG1 must be either
8496 SSA_NAME or invariant. Note that this is strictly an optimization.
8497 That is, callers of this function can directly call operand_equal_p
8498 and get the same result, only slower. */
8501 operand_equal_for_phi_arg_p (const_tree arg0, const_tree arg1)
8505 if (TREE_CODE (arg0) == SSA_NAME || TREE_CODE (arg1) == SSA_NAME)
8507 return operand_equal_p (arg0, arg1, 0);
8510 /* Returns number of zeros at the end of binary representation of X.
8512 ??? Use ffs if available? */
8515 num_ending_zeros (const_tree x)
8517 unsigned HOST_WIDE_INT fr, nfr;
8518 unsigned num, abits;
8519 tree type = TREE_TYPE (x);
8521 if (TREE_INT_CST_LOW (x) == 0)
8523 num = HOST_BITS_PER_WIDE_INT;
8524 fr = TREE_INT_CST_HIGH (x);
8529 fr = TREE_INT_CST_LOW (x);
8532 for (abits = HOST_BITS_PER_WIDE_INT / 2; abits; abits /= 2)
8535 if (nfr << abits == fr)
8542 if (num > TYPE_PRECISION (type))
8543 num = TYPE_PRECISION (type);
8545 return build_int_cst_type (type, num);
8549 #define WALK_SUBTREE(NODE) \
8552 result = walk_tree_1 (&(NODE), func, data, pset, lh); \
8558 /* This is a subroutine of walk_tree that walks field of TYPE that are to
8559 be walked whenever a type is seen in the tree. Rest of operands and return
8560 value are as for walk_tree. */
8563 walk_type_fields (tree type, walk_tree_fn func, void *data,
8564 struct pointer_set_t *pset, walk_tree_lh lh)
8566 tree result = NULL_TREE;
8568 switch (TREE_CODE (type))
8571 case REFERENCE_TYPE:
8572 /* We have to worry about mutually recursive pointers. These can't
8573 be written in C. They can in Ada. It's pathological, but
8574 there's an ACATS test (c38102a) that checks it. Deal with this
8575 by checking if we're pointing to another pointer, that one
8576 points to another pointer, that one does too, and we have no htab.
8577 If so, get a hash table. We check three levels deep to avoid
8578 the cost of the hash table if we don't need one. */
8579 if (POINTER_TYPE_P (TREE_TYPE (type))
8580 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (type)))
8581 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (TREE_TYPE (type))))
8584 result = walk_tree_without_duplicates (&TREE_TYPE (type),
8592 /* ... fall through ... */
8595 WALK_SUBTREE (TREE_TYPE (type));
8599 WALK_SUBTREE (TYPE_METHOD_BASETYPE (type));
8604 WALK_SUBTREE (TREE_TYPE (type));
8608 /* We never want to walk into default arguments. */
8609 for (arg = TYPE_ARG_TYPES (type); arg; arg = TREE_CHAIN (arg))
8610 WALK_SUBTREE (TREE_VALUE (arg));
8615 /* Don't follow this nodes's type if a pointer for fear that
8616 we'll have infinite recursion. If we have a PSET, then we
8619 || (!POINTER_TYPE_P (TREE_TYPE (type))
8620 && TREE_CODE (TREE_TYPE (type)) != OFFSET_TYPE))
8621 WALK_SUBTREE (TREE_TYPE (type));
8622 WALK_SUBTREE (TYPE_DOMAIN (type));
8626 WALK_SUBTREE (TREE_TYPE (type));
8627 WALK_SUBTREE (TYPE_OFFSET_BASETYPE (type));
8637 /* Apply FUNC to all the sub-trees of TP in a pre-order traversal. FUNC is
8638 called with the DATA and the address of each sub-tree. If FUNC returns a
8639 non-NULL value, the traversal is stopped, and the value returned by FUNC
8640 is returned. If PSET is non-NULL it is used to record the nodes visited,
8641 and to avoid visiting a node more than once. */
8644 walk_tree_1 (tree *tp, walk_tree_fn func, void *data,
8645 struct pointer_set_t *pset, walk_tree_lh lh)
8647 enum tree_code code;
8651 #define WALK_SUBTREE_TAIL(NODE) \
8655 goto tail_recurse; \
8660 /* Skip empty subtrees. */
8664 /* Don't walk the same tree twice, if the user has requested
8665 that we avoid doing so. */
8666 if (pset && pointer_set_insert (pset, *tp))
8669 /* Call the function. */
8671 result = (*func) (tp, &walk_subtrees, data);
8673 /* If we found something, return it. */
8677 code = TREE_CODE (*tp);
8679 /* Even if we didn't, FUNC may have decided that there was nothing
8680 interesting below this point in the tree. */
8683 /* But we still need to check our siblings. */
8684 if (code == TREE_LIST)
8685 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp));
8686 else if (code == OMP_CLAUSE)
8687 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
8694 result = (*lh) (tp, &walk_subtrees, func, data, pset);
8695 if (result || !walk_subtrees)
8702 case IDENTIFIER_NODE:
8709 case PLACEHOLDER_EXPR:
8713 /* None of these have subtrees other than those already walked
8718 WALK_SUBTREE (TREE_VALUE (*tp));
8719 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp));
8724 int len = TREE_VEC_LENGTH (*tp);
8729 /* Walk all elements but the first. */
8731 WALK_SUBTREE (TREE_VEC_ELT (*tp, len));
8733 /* Now walk the first one as a tail call. */
8734 WALK_SUBTREE_TAIL (TREE_VEC_ELT (*tp, 0));
8738 WALK_SUBTREE (TREE_REALPART (*tp));
8739 WALK_SUBTREE_TAIL (TREE_IMAGPART (*tp));
8743 unsigned HOST_WIDE_INT idx;
8744 constructor_elt *ce;
8747 VEC_iterate(constructor_elt, CONSTRUCTOR_ELTS (*tp), idx, ce);
8749 WALK_SUBTREE (ce->value);
8754 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, 0));
8759 for (decl = BIND_EXPR_VARS (*tp); decl; decl = TREE_CHAIN (decl))
8761 /* Walk the DECL_INITIAL and DECL_SIZE. We don't want to walk
8762 into declarations that are just mentioned, rather than
8763 declared; they don't really belong to this part of the tree.
8764 And, we can see cycles: the initializer for a declaration
8765 can refer to the declaration itself. */
8766 WALK_SUBTREE (DECL_INITIAL (decl));
8767 WALK_SUBTREE (DECL_SIZE (decl));
8768 WALK_SUBTREE (DECL_SIZE_UNIT (decl));
8770 WALK_SUBTREE_TAIL (BIND_EXPR_BODY (*tp));
8773 case STATEMENT_LIST:
8775 tree_stmt_iterator i;
8776 for (i = tsi_start (*tp); !tsi_end_p (i); tsi_next (&i))
8777 WALK_SUBTREE (*tsi_stmt_ptr (i));
8782 switch (OMP_CLAUSE_CODE (*tp))
8784 case OMP_CLAUSE_PRIVATE:
8785 case OMP_CLAUSE_SHARED:
8786 case OMP_CLAUSE_FIRSTPRIVATE:
8787 case OMP_CLAUSE_COPYIN:
8788 case OMP_CLAUSE_COPYPRIVATE:
8790 case OMP_CLAUSE_NUM_THREADS:
8791 case OMP_CLAUSE_SCHEDULE:
8792 WALK_SUBTREE (OMP_CLAUSE_OPERAND (*tp, 0));
8795 case OMP_CLAUSE_NOWAIT:
8796 case OMP_CLAUSE_ORDERED:
8797 case OMP_CLAUSE_DEFAULT:
8798 case OMP_CLAUSE_UNTIED:
8799 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
8801 case OMP_CLAUSE_LASTPRIVATE:
8802 WALK_SUBTREE (OMP_CLAUSE_DECL (*tp));
8803 WALK_SUBTREE (OMP_CLAUSE_LASTPRIVATE_STMT (*tp));
8804 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
8806 case OMP_CLAUSE_COLLAPSE:
8809 for (i = 0; i < 3; i++)
8810 WALK_SUBTREE (OMP_CLAUSE_OPERAND (*tp, i));
8811 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
8814 case OMP_CLAUSE_REDUCTION:
8817 for (i = 0; i < 4; i++)
8818 WALK_SUBTREE (OMP_CLAUSE_OPERAND (*tp, i));
8819 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp));
8831 /* TARGET_EXPRs are peculiar: operands 1 and 3 can be the same.
8832 But, we only want to walk once. */
8833 len = (TREE_OPERAND (*tp, 3) == TREE_OPERAND (*tp, 1)) ? 2 : 3;
8834 for (i = 0; i < len; ++i)
8835 WALK_SUBTREE (TREE_OPERAND (*tp, i));
8836 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, len));
8839 case CHANGE_DYNAMIC_TYPE_EXPR:
8840 WALK_SUBTREE (CHANGE_DYNAMIC_TYPE_NEW_TYPE (*tp));
8841 WALK_SUBTREE_TAIL (CHANGE_DYNAMIC_TYPE_LOCATION (*tp));
8844 /* If this is a TYPE_DECL, walk into the fields of the type that it's
8845 defining. We only want to walk into these fields of a type in this
8846 case and not in the general case of a mere reference to the type.
8848 The criterion is as follows: if the field can be an expression, it
8849 must be walked only here. This should be in keeping with the fields
8850 that are directly gimplified in gimplify_type_sizes in order for the
8851 mark/copy-if-shared/unmark machinery of the gimplifier to work with
8852 variable-sized types.
8854 Note that DECLs get walked as part of processing the BIND_EXPR. */
8855 if (TREE_CODE (DECL_EXPR_DECL (*tp)) == TYPE_DECL)
8857 tree *type_p = &TREE_TYPE (DECL_EXPR_DECL (*tp));
8858 if (TREE_CODE (*type_p) == ERROR_MARK)
8861 /* Call the function for the type. See if it returns anything or
8862 doesn't want us to continue. If we are to continue, walk both
8863 the normal fields and those for the declaration case. */
8864 result = (*func) (type_p, &walk_subtrees, data);
8865 if (result || !walk_subtrees)
8868 result = walk_type_fields (*type_p, func, data, pset, lh);
8872 /* If this is a record type, also walk the fields. */
8873 if (TREE_CODE (*type_p) == RECORD_TYPE
8874 || TREE_CODE (*type_p) == UNION_TYPE
8875 || TREE_CODE (*type_p) == QUAL_UNION_TYPE)
8879 for (field = TYPE_FIELDS (*type_p); field;
8880 field = TREE_CHAIN (field))
8882 /* We'd like to look at the type of the field, but we can
8883 easily get infinite recursion. So assume it's pointed
8884 to elsewhere in the tree. Also, ignore things that
8886 if (TREE_CODE (field) != FIELD_DECL)
8889 WALK_SUBTREE (DECL_FIELD_OFFSET (field));
8890 WALK_SUBTREE (DECL_SIZE (field));
8891 WALK_SUBTREE (DECL_SIZE_UNIT (field));
8892 if (TREE_CODE (*type_p) == QUAL_UNION_TYPE)
8893 WALK_SUBTREE (DECL_QUALIFIER (field));
8897 /* Same for scalar types. */
8898 else if (TREE_CODE (*type_p) == BOOLEAN_TYPE
8899 || TREE_CODE (*type_p) == ENUMERAL_TYPE
8900 || TREE_CODE (*type_p) == INTEGER_TYPE
8901 || TREE_CODE (*type_p) == FIXED_POINT_TYPE
8902 || TREE_CODE (*type_p) == REAL_TYPE)
8904 WALK_SUBTREE (TYPE_MIN_VALUE (*type_p));
8905 WALK_SUBTREE (TYPE_MAX_VALUE (*type_p));
8908 WALK_SUBTREE (TYPE_SIZE (*type_p));
8909 WALK_SUBTREE_TAIL (TYPE_SIZE_UNIT (*type_p));
8914 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code)))
8918 /* Walk over all the sub-trees of this operand. */
8919 len = TREE_OPERAND_LENGTH (*tp);
8921 /* Go through the subtrees. We need to do this in forward order so
8922 that the scope of a FOR_EXPR is handled properly. */
8925 for (i = 0; i < len - 1; ++i)
8926 WALK_SUBTREE (TREE_OPERAND (*tp, i));
8927 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp, len - 1));
8930 /* If this is a type, walk the needed fields in the type. */
8931 else if (TYPE_P (*tp))
8932 return walk_type_fields (*tp, func, data, pset, lh);
8936 /* We didn't find what we were looking for. */
8939 #undef WALK_SUBTREE_TAIL
8943 /* Like walk_tree, but does not walk duplicate nodes more than once. */
8946 walk_tree_without_duplicates_1 (tree *tp, walk_tree_fn func, void *data,
8950 struct pointer_set_t *pset;
8952 pset = pointer_set_create ();
8953 result = walk_tree_1 (tp, func, data, pset, lh);
8954 pointer_set_destroy (pset);
8962 char const c = TREE_CODE_CLASS (TREE_CODE (t));
8964 if (IS_EXPR_CODE_CLASS (c))
8965 return &t->exp.block;
8970 /* Build and return a TREE_LIST of arguments in the CALL_EXPR exp.
8971 FIXME: don't use this function. It exists for compatibility with
8972 the old representation of CALL_EXPRs where a list was used to hold the
8973 arguments. Places that currently extract the arglist from a CALL_EXPR
8974 ought to be rewritten to use the CALL_EXPR itself. */
8976 call_expr_arglist (tree exp)
8978 tree arglist = NULL_TREE;
8980 for (i = call_expr_nargs (exp) - 1; i >= 0; i--)
8981 arglist = tree_cons (NULL_TREE, CALL_EXPR_ARG (exp, i), arglist);
8986 /* Create a nameless artificial label and put it in the current function
8987 context. Returns the newly created label. */
8990 create_artificial_label (void)
8992 tree lab = build_decl (LABEL_DECL, NULL_TREE, void_type_node);
8994 DECL_ARTIFICIAL (lab) = 1;
8995 DECL_IGNORED_P (lab) = 1;
8996 DECL_CONTEXT (lab) = current_function_decl;
9000 /* Given a tree, try to return a useful variable name that we can use
9001 to prefix a temporary that is being assigned the value of the tree.
9002 I.E. given <temp> = &A, return A. */
9010 STRIP_NOPS (stripped_decl);
9011 if (DECL_P (stripped_decl) && DECL_NAME (stripped_decl))
9012 return IDENTIFIER_POINTER (DECL_NAME (stripped_decl));
9015 switch (TREE_CODE (stripped_decl))
9018 return get_name (TREE_OPERAND (stripped_decl, 0));
9025 /* Return true if TYPE has a variable argument list. */
9028 stdarg_p (tree fntype)
9030 function_args_iterator args_iter;
9031 tree n = NULL_TREE, t;
9036 FOREACH_FUNCTION_ARGS(fntype, t, args_iter)
9041 return n != NULL_TREE && n != void_type_node;
9044 /* Return true if TYPE has a prototype. */
9047 prototype_p (tree fntype)
9051 gcc_assert (fntype != NULL_TREE);
9053 t = TYPE_ARG_TYPES (fntype);
9054 return (t != NULL_TREE);
9057 /* If BLOCK is inlined from an __attribute__((__artificial__))
9058 routine, return pointer to location from where it has been
9061 block_nonartificial_location (tree block)
9063 location_t *ret = NULL;
9065 while (block && TREE_CODE (block) == BLOCK
9066 && BLOCK_ABSTRACT_ORIGIN (block))
9068 tree ao = BLOCK_ABSTRACT_ORIGIN (block);
9070 while (TREE_CODE (ao) == BLOCK
9071 && BLOCK_ABSTRACT_ORIGIN (ao)
9072 && BLOCK_ABSTRACT_ORIGIN (ao) != ao)
9073 ao = BLOCK_ABSTRACT_ORIGIN (ao);
9075 if (TREE_CODE (ao) == FUNCTION_DECL)
9077 /* If AO is an artificial inline, point RET to the
9078 call site locus at which it has been inlined and continue
9079 the loop, in case AO's caller is also an artificial
9081 if (DECL_DECLARED_INLINE_P (ao)
9082 && lookup_attribute ("artificial", DECL_ATTRIBUTES (ao)))
9083 ret = &BLOCK_SOURCE_LOCATION (block);
9087 else if (TREE_CODE (ao) != BLOCK)
9090 block = BLOCK_SUPERCONTEXT (block);
9096 /* If EXP is inlined from an __attribute__((__artificial__))
9097 function, return the location of the original call expression. */
9100 tree_nonartificial_location (tree exp)
9102 tree block = TREE_BLOCK (exp);
9105 && TREE_CODE (block) == BLOCK
9106 && BLOCK_ABSTRACT_ORIGIN (block))
9108 tree ao = BLOCK_ABSTRACT_ORIGIN (block);
9112 if (TREE_CODE (ao) == FUNCTION_DECL
9113 && DECL_DECLARED_INLINE_P (ao)
9114 && lookup_attribute ("artificial", DECL_ATTRIBUTES (ao)))
9115 return BLOCK_SOURCE_LOCATION (block);
9116 else if (TREE_CODE (ao) == BLOCK
9117 && BLOCK_SUPERCONTEXT (ao) != ao)
9118 ao = BLOCK_SUPERCONTEXT (ao);
9124 block = BLOCK_SUPERCONTEXT (block);
9127 return EXPR_LOCATION (exp);
9131 /* These are the hash table functions for the hash table of OPTIMIZATION_NODEq
9134 /* Return the hash code code X, an OPTIMIZATION_NODE or TARGET_OPTION code. */
9137 cl_option_hash_hash (const void *x)
9139 const_tree const t = (const_tree) x;
9145 if (TREE_CODE (t) == OPTIMIZATION_NODE)
9147 p = (const char *)TREE_OPTIMIZATION (t);
9148 len = sizeof (struct cl_optimization);
9151 else if (TREE_CODE (t) == TARGET_OPTION_NODE)
9153 p = (const char *)TREE_TARGET_OPTION (t);
9154 len = sizeof (struct cl_target_option);
9160 /* assume most opt flags are just 0/1, some are 2-3, and a few might be
9162 for (i = 0; i < len; i++)
9164 hash = (hash << 4) ^ ((i << 2) | p[i]);
9169 /* Return nonzero if the value represented by *X (an OPTIMIZATION or
9170 TARGET_OPTION tree node) is the same as that given by *Y, which is the
9174 cl_option_hash_eq (const void *x, const void *y)
9176 const_tree const xt = (const_tree) x;
9177 const_tree const yt = (const_tree) y;
9182 if (TREE_CODE (xt) != TREE_CODE (yt))
9185 if (TREE_CODE (xt) == OPTIMIZATION_NODE)
9187 xp = (const char *)TREE_OPTIMIZATION (xt);
9188 yp = (const char *)TREE_OPTIMIZATION (yt);
9189 len = sizeof (struct cl_optimization);
9192 else if (TREE_CODE (xt) == TARGET_OPTION_NODE)
9194 xp = (const char *)TREE_TARGET_OPTION (xt);
9195 yp = (const char *)TREE_TARGET_OPTION (yt);
9196 len = sizeof (struct cl_target_option);
9202 return (memcmp (xp, yp, len) == 0);
9205 /* Build an OPTIMIZATION_NODE based on the current options. */
9208 build_optimization_node (void)
9213 /* Use the cache of optimization nodes. */
9215 cl_optimization_save (TREE_OPTIMIZATION (cl_optimization_node));
9217 slot = htab_find_slot (cl_option_hash_table, cl_optimization_node, INSERT);
9221 /* Insert this one into the hash table. */
9222 t = cl_optimization_node;
9225 /* Make a new node for next time round. */
9226 cl_optimization_node = make_node (OPTIMIZATION_NODE);
9232 /* Build a TARGET_OPTION_NODE based on the current options. */
9235 build_target_option_node (void)
9240 /* Use the cache of optimization nodes. */
9242 cl_target_option_save (TREE_TARGET_OPTION (cl_target_option_node));
9244 slot = htab_find_slot (cl_option_hash_table, cl_target_option_node, INSERT);
9248 /* Insert this one into the hash table. */
9249 t = cl_target_option_node;
9252 /* Make a new node for next time round. */
9253 cl_target_option_node = make_node (TARGET_OPTION_NODE);
9259 /* Determine the "ultimate origin" of a block. The block may be an inlined
9260 instance of an inlined instance of a block which is local to an inline
9261 function, so we have to trace all of the way back through the origin chain
9262 to find out what sort of node actually served as the original seed for the
9266 block_ultimate_origin (const_tree block)
9268 tree immediate_origin = BLOCK_ABSTRACT_ORIGIN (block);
9270 /* output_inline_function sets BLOCK_ABSTRACT_ORIGIN for all the
9271 nodes in the function to point to themselves; ignore that if
9272 we're trying to output the abstract instance of this function. */
9273 if (BLOCK_ABSTRACT (block) && immediate_origin == block)
9276 if (immediate_origin == NULL_TREE)
9281 tree lookahead = immediate_origin;
9285 ret_val = lookahead;
9286 lookahead = (TREE_CODE (ret_val) == BLOCK
9287 ? BLOCK_ABSTRACT_ORIGIN (ret_val) : NULL);
9289 while (lookahead != NULL && lookahead != ret_val);
9291 /* The block's abstract origin chain may not be the *ultimate* origin of
9292 the block. It could lead to a DECL that has an abstract origin set.
9293 If so, we want that DECL's abstract origin (which is what DECL_ORIGIN
9294 will give us if it has one). Note that DECL's abstract origins are
9295 supposed to be the most distant ancestor (or so decl_ultimate_origin
9296 claims), so we don't need to loop following the DECL origins. */
9297 if (DECL_P (ret_val))
9298 return DECL_ORIGIN (ret_val);
9304 /* Return true if T1 and T2 are equivalent lists. */
9307 list_equal_p (const_tree t1, const_tree t2)
9309 for (; t1 && t2; t1 = TREE_CHAIN (t1) , t2 = TREE_CHAIN (t2))
9310 if (TREE_VALUE (t1) != TREE_VALUE (t2))
9316 #include "gt-tree.h"