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
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 /* Each tree code class has an associated string representation.
56 These must correspond to the tree_code_class entries. */
58 const char *const tree_code_class_strings
[] =
74 /* obstack.[ch] explicitly declined to prototype this. */
75 extern int _obstack_allocated_p (struct obstack
*h
, void *obj
);
77 #ifdef GATHER_STATISTICS
78 /* Statistics-gathering stuff. */
80 int tree_node_counts
[(int) all_kinds
];
81 int tree_node_sizes
[(int) all_kinds
];
83 /* Keep in sync with tree.h:enum tree_node_kind. */
84 static const char * const tree_node_kind_names
[] = {
106 #endif /* GATHER_STATISTICS */
108 /* Unique id for next decl created. */
109 static GTY(()) int next_decl_uid
;
110 /* Unique id for next type created. */
111 static GTY(()) int next_type_uid
= 1;
113 /* Since we cannot rehash a type after it is in the table, we have to
114 keep the hash code. */
116 struct type_hash
GTY(())
122 /* Initial size of the hash table (rounded to next prime). */
123 #define TYPE_HASH_INITIAL_SIZE 1000
125 /* Now here is the hash table. When recording a type, it is added to
126 the slot whose index is the hash code. Note that the hash table is
127 used for several kinds of types (function types, array types and
128 array index range types, for now). While all these live in the
129 same table, they are completely independent, and the hash code is
130 computed differently for each of these. */
132 static GTY ((if_marked ("type_hash_marked_p"), param_is (struct type_hash
)))
133 htab_t type_hash_table
;
135 /* Hash table and temporary node for larger integer const values. */
136 static GTY (()) tree int_cst_node
;
137 static GTY ((if_marked ("ggc_marked_p"), param_is (union tree_node
)))
138 htab_t int_cst_hash_table
;
140 /* General tree->tree mapping structure for use in hash tables. */
143 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
144 htab_t debug_expr_for_decl
;
146 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
147 htab_t value_expr_for_decl
;
149 static GTY ((if_marked ("tree_priority_map_marked_p"),
150 param_is (struct tree_priority_map
)))
151 htab_t init_priority_for_decl
;
153 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
154 htab_t restrict_base_for_decl
;
156 static void set_type_quals (tree
, int);
157 static int type_hash_eq (const void *, const void *);
158 static hashval_t
type_hash_hash (const void *);
159 static hashval_t
int_cst_hash_hash (const void *);
160 static int int_cst_hash_eq (const void *, const void *);
161 static void print_type_hash_statistics (void);
162 static void print_debug_expr_statistics (void);
163 static void print_value_expr_statistics (void);
164 static int type_hash_marked_p (const void *);
165 static unsigned int type_hash_list (const_tree
, hashval_t
);
166 static unsigned int attribute_hash_list (const_tree
, hashval_t
);
168 tree global_trees
[TI_MAX
];
169 tree integer_types
[itk_none
];
171 unsigned char tree_contains_struct
[MAX_TREE_CODES
][64];
173 /* Number of operands for each OpenMP clause. */
174 unsigned const char omp_clause_num_ops
[] =
176 0, /* OMP_CLAUSE_ERROR */
177 1, /* OMP_CLAUSE_PRIVATE */
178 1, /* OMP_CLAUSE_SHARED */
179 1, /* OMP_CLAUSE_FIRSTPRIVATE */
180 1, /* OMP_CLAUSE_LASTPRIVATE */
181 4, /* OMP_CLAUSE_REDUCTION */
182 1, /* OMP_CLAUSE_COPYIN */
183 1, /* OMP_CLAUSE_COPYPRIVATE */
184 1, /* OMP_CLAUSE_IF */
185 1, /* OMP_CLAUSE_NUM_THREADS */
186 1, /* OMP_CLAUSE_SCHEDULE */
187 0, /* OMP_CLAUSE_NOWAIT */
188 0, /* OMP_CLAUSE_ORDERED */
189 0 /* OMP_CLAUSE_DEFAULT */
192 const char * const omp_clause_code_name
[] =
215 /* Initialize the hash table of types. */
216 type_hash_table
= htab_create_ggc (TYPE_HASH_INITIAL_SIZE
, type_hash_hash
,
219 debug_expr_for_decl
= htab_create_ggc (512, tree_map_hash
,
222 value_expr_for_decl
= htab_create_ggc (512, tree_map_hash
,
224 init_priority_for_decl
= htab_create_ggc (512, tree_priority_map_hash
,
225 tree_priority_map_eq
, 0);
226 restrict_base_for_decl
= htab_create_ggc (256, tree_map_hash
,
229 int_cst_hash_table
= htab_create_ggc (1024, int_cst_hash_hash
,
230 int_cst_hash_eq
, NULL
);
232 int_cst_node
= make_node (INTEGER_CST
);
234 tree_contains_struct
[FUNCTION_DECL
][TS_DECL_NON_COMMON
] = 1;
235 tree_contains_struct
[TRANSLATION_UNIT_DECL
][TS_DECL_NON_COMMON
] = 1;
236 tree_contains_struct
[TYPE_DECL
][TS_DECL_NON_COMMON
] = 1;
239 tree_contains_struct
[CONST_DECL
][TS_DECL_COMMON
] = 1;
240 tree_contains_struct
[VAR_DECL
][TS_DECL_COMMON
] = 1;
241 tree_contains_struct
[PARM_DECL
][TS_DECL_COMMON
] = 1;
242 tree_contains_struct
[RESULT_DECL
][TS_DECL_COMMON
] = 1;
243 tree_contains_struct
[FUNCTION_DECL
][TS_DECL_COMMON
] = 1;
244 tree_contains_struct
[TYPE_DECL
][TS_DECL_COMMON
] = 1;
245 tree_contains_struct
[TRANSLATION_UNIT_DECL
][TS_DECL_COMMON
] = 1;
246 tree_contains_struct
[LABEL_DECL
][TS_DECL_COMMON
] = 1;
247 tree_contains_struct
[FIELD_DECL
][TS_DECL_COMMON
] = 1;
250 tree_contains_struct
[CONST_DECL
][TS_DECL_WRTL
] = 1;
251 tree_contains_struct
[VAR_DECL
][TS_DECL_WRTL
] = 1;
252 tree_contains_struct
[PARM_DECL
][TS_DECL_WRTL
] = 1;
253 tree_contains_struct
[RESULT_DECL
][TS_DECL_WRTL
] = 1;
254 tree_contains_struct
[FUNCTION_DECL
][TS_DECL_WRTL
] = 1;
255 tree_contains_struct
[LABEL_DECL
][TS_DECL_WRTL
] = 1;
257 tree_contains_struct
[CONST_DECL
][TS_DECL_MINIMAL
] = 1;
258 tree_contains_struct
[VAR_DECL
][TS_DECL_MINIMAL
] = 1;
259 tree_contains_struct
[PARM_DECL
][TS_DECL_MINIMAL
] = 1;
260 tree_contains_struct
[RESULT_DECL
][TS_DECL_MINIMAL
] = 1;
261 tree_contains_struct
[FUNCTION_DECL
][TS_DECL_MINIMAL
] = 1;
262 tree_contains_struct
[TYPE_DECL
][TS_DECL_MINIMAL
] = 1;
263 tree_contains_struct
[TRANSLATION_UNIT_DECL
][TS_DECL_MINIMAL
] = 1;
264 tree_contains_struct
[LABEL_DECL
][TS_DECL_MINIMAL
] = 1;
265 tree_contains_struct
[FIELD_DECL
][TS_DECL_MINIMAL
] = 1;
266 tree_contains_struct
[STRUCT_FIELD_TAG
][TS_DECL_MINIMAL
] = 1;
267 tree_contains_struct
[NAME_MEMORY_TAG
][TS_DECL_MINIMAL
] = 1;
268 tree_contains_struct
[SYMBOL_MEMORY_TAG
][TS_DECL_MINIMAL
] = 1;
269 tree_contains_struct
[MEMORY_PARTITION_TAG
][TS_DECL_MINIMAL
] = 1;
271 tree_contains_struct
[STRUCT_FIELD_TAG
][TS_MEMORY_TAG
] = 1;
272 tree_contains_struct
[NAME_MEMORY_TAG
][TS_MEMORY_TAG
] = 1;
273 tree_contains_struct
[SYMBOL_MEMORY_TAG
][TS_MEMORY_TAG
] = 1;
274 tree_contains_struct
[MEMORY_PARTITION_TAG
][TS_MEMORY_TAG
] = 1;
276 tree_contains_struct
[STRUCT_FIELD_TAG
][TS_STRUCT_FIELD_TAG
] = 1;
277 tree_contains_struct
[MEMORY_PARTITION_TAG
][TS_MEMORY_PARTITION_TAG
] = 1;
279 tree_contains_struct
[VAR_DECL
][TS_DECL_WITH_VIS
] = 1;
280 tree_contains_struct
[FUNCTION_DECL
][TS_DECL_WITH_VIS
] = 1;
281 tree_contains_struct
[TYPE_DECL
][TS_DECL_WITH_VIS
] = 1;
282 tree_contains_struct
[TRANSLATION_UNIT_DECL
][TS_DECL_WITH_VIS
] = 1;
284 tree_contains_struct
[VAR_DECL
][TS_VAR_DECL
] = 1;
285 tree_contains_struct
[FIELD_DECL
][TS_FIELD_DECL
] = 1;
286 tree_contains_struct
[PARM_DECL
][TS_PARM_DECL
] = 1;
287 tree_contains_struct
[LABEL_DECL
][TS_LABEL_DECL
] = 1;
288 tree_contains_struct
[RESULT_DECL
][TS_RESULT_DECL
] = 1;
289 tree_contains_struct
[CONST_DECL
][TS_CONST_DECL
] = 1;
290 tree_contains_struct
[TYPE_DECL
][TS_TYPE_DECL
] = 1;
291 tree_contains_struct
[FUNCTION_DECL
][TS_FUNCTION_DECL
] = 1;
293 lang_hooks
.init_ts ();
297 /* The name of the object as the assembler will see it (but before any
298 translations made by ASM_OUTPUT_LABELREF). Often this is the same
299 as DECL_NAME. It is an IDENTIFIER_NODE. */
301 decl_assembler_name (tree decl
)
303 if (!DECL_ASSEMBLER_NAME_SET_P (decl
))
304 lang_hooks
.set_decl_assembler_name (decl
);
305 return DECL_WITH_VIS_CHECK (decl
)->decl_with_vis
.assembler_name
;
308 /* Compare ASMNAME with the DECL_ASSEMBLER_NAME of DECL. */
311 decl_assembler_name_equal (tree decl
, tree asmname
)
313 tree decl_asmname
= DECL_ASSEMBLER_NAME (decl
);
315 if (decl_asmname
== asmname
)
318 /* If the target assembler name was set by the user, things are trickier.
319 We have a leading '*' to begin with. After that, it's arguable what
320 is the correct thing to do with -fleading-underscore. Arguably, we've
321 historically been doing the wrong thing in assemble_alias by always
322 printing the leading underscore. Since we're not changing that, make
323 sure user_label_prefix follows the '*' before matching. */
324 if (IDENTIFIER_POINTER (decl_asmname
)[0] == '*')
326 const char *decl_str
= IDENTIFIER_POINTER (decl_asmname
) + 1;
327 size_t ulp_len
= strlen (user_label_prefix
);
331 else if (strncmp (decl_str
, user_label_prefix
, ulp_len
) == 0)
336 return strcmp (decl_str
, IDENTIFIER_POINTER (asmname
)) == 0;
342 /* Compute the number of bytes occupied by a tree with code CODE.
343 This function cannot be used for nodes that have variable sizes,
344 including TREE_VEC, PHI_NODE, STRING_CST, and CALL_EXPR. */
346 tree_code_size (enum tree_code code
)
348 switch (TREE_CODE_CLASS (code
))
350 case tcc_declaration
: /* A decl node */
355 return sizeof (struct tree_field_decl
);
357 return sizeof (struct tree_parm_decl
);
359 return sizeof (struct tree_var_decl
);
361 return sizeof (struct tree_label_decl
);
363 return sizeof (struct tree_result_decl
);
365 return sizeof (struct tree_const_decl
);
367 return sizeof (struct tree_type_decl
);
369 return sizeof (struct tree_function_decl
);
370 case NAME_MEMORY_TAG
:
371 case SYMBOL_MEMORY_TAG
:
372 return sizeof (struct tree_memory_tag
);
373 case STRUCT_FIELD_TAG
:
374 return sizeof (struct tree_struct_field_tag
);
375 case MEMORY_PARTITION_TAG
:
376 return sizeof (struct tree_memory_partition_tag
);
378 return sizeof (struct tree_decl_non_common
);
382 case tcc_type
: /* a type node */
383 return sizeof (struct tree_type
);
385 case tcc_reference
: /* a reference */
386 case tcc_expression
: /* an expression */
387 case tcc_statement
: /* an expression with side effects */
388 case tcc_comparison
: /* a comparison expression */
389 case tcc_unary
: /* a unary arithmetic expression */
390 case tcc_binary
: /* a binary arithmetic expression */
391 return (sizeof (struct tree_exp
)
392 + (TREE_CODE_LENGTH (code
) - 1) * sizeof (tree
));
394 case tcc_gimple_stmt
:
395 return (sizeof (struct gimple_stmt
)
396 + (TREE_CODE_LENGTH (code
) - 1) * sizeof (char *));
398 case tcc_constant
: /* a constant */
401 case INTEGER_CST
: return sizeof (struct tree_int_cst
);
402 case REAL_CST
: return sizeof (struct tree_real_cst
);
403 case FIXED_CST
: return sizeof (struct tree_fixed_cst
);
404 case COMPLEX_CST
: return sizeof (struct tree_complex
);
405 case VECTOR_CST
: return sizeof (struct tree_vector
);
406 case STRING_CST
: gcc_unreachable ();
408 return lang_hooks
.tree_size (code
);
411 case tcc_exceptional
: /* something random, like an identifier. */
414 case IDENTIFIER_NODE
: return lang_hooks
.identifier_size
;
415 case TREE_LIST
: return sizeof (struct tree_list
);
418 case PLACEHOLDER_EXPR
: return sizeof (struct tree_common
);
422 case PHI_NODE
: gcc_unreachable ();
424 case SSA_NAME
: return sizeof (struct tree_ssa_name
);
426 case STATEMENT_LIST
: return sizeof (struct tree_statement_list
);
427 case BLOCK
: return sizeof (struct tree_block
);
428 case VALUE_HANDLE
: return sizeof (struct tree_value_handle
);
429 case CONSTRUCTOR
: return sizeof (struct tree_constructor
);
432 return lang_hooks
.tree_size (code
);
440 /* Compute the number of bytes occupied by NODE. This routine only
441 looks at TREE_CODE, except for those nodes that have variable sizes. */
443 tree_size (const_tree node
)
445 const enum tree_code code
= TREE_CODE (node
);
449 return (sizeof (struct tree_phi_node
)
450 + (PHI_ARG_CAPACITY (node
) - 1) * sizeof (struct phi_arg_d
));
453 return (offsetof (struct tree_binfo
, base_binfos
)
454 + VEC_embedded_size (tree
, BINFO_N_BASE_BINFOS (node
)));
457 return (sizeof (struct tree_vec
)
458 + (TREE_VEC_LENGTH (node
) - 1) * sizeof (tree
));
461 return TREE_STRING_LENGTH (node
) + offsetof (struct tree_string
, str
) + 1;
464 return (sizeof (struct tree_omp_clause
)
465 + (omp_clause_num_ops
[OMP_CLAUSE_CODE (node
)] - 1)
469 if (TREE_CODE_CLASS (code
) == tcc_vl_exp
)
470 return (sizeof (struct tree_exp
)
471 + (VL_EXP_OPERAND_LENGTH (node
) - 1) * sizeof (tree
));
473 return tree_code_size (code
);
477 /* Return a newly allocated node of code CODE. For decl and type
478 nodes, some other fields are initialized. The rest of the node is
479 initialized to zero. This function cannot be used for PHI_NODE,
480 TREE_VEC or OMP_CLAUSE nodes, which is enforced by asserts in
483 Achoo! I got a code in the node. */
486 make_node_stat (enum tree_code code MEM_STAT_DECL
)
489 enum tree_code_class type
= TREE_CODE_CLASS (code
);
490 size_t length
= tree_code_size (code
);
491 #ifdef GATHER_STATISTICS
496 case tcc_declaration
: /* A decl node */
500 case tcc_type
: /* a type node */
504 case tcc_statement
: /* an expression with side effects */
508 case tcc_reference
: /* a reference */
512 case tcc_expression
: /* an expression */
513 case tcc_comparison
: /* a comparison expression */
514 case tcc_unary
: /* a unary arithmetic expression */
515 case tcc_binary
: /* a binary arithmetic expression */
519 case tcc_constant
: /* a constant */
523 case tcc_gimple_stmt
:
524 kind
= gimple_stmt_kind
;
527 case tcc_exceptional
: /* something random, like an identifier. */
530 case IDENTIFIER_NODE
:
547 kind
= ssa_name_kind
;
568 tree_node_counts
[(int) kind
]++;
569 tree_node_sizes
[(int) kind
] += length
;
572 if (code
== IDENTIFIER_NODE
)
573 t
= ggc_alloc_zone_pass_stat (length
, &tree_id_zone
);
575 t
= ggc_alloc_zone_pass_stat (length
, &tree_zone
);
577 memset (t
, 0, length
);
579 TREE_SET_CODE (t
, code
);
584 TREE_SIDE_EFFECTS (t
) = 1;
587 case tcc_declaration
:
588 if (CODE_CONTAINS_STRUCT (code
, TS_DECL_WITH_VIS
))
589 DECL_IN_SYSTEM_HEADER (t
) = in_system_header
;
590 if (CODE_CONTAINS_STRUCT (code
, TS_DECL_COMMON
))
592 if (code
== FUNCTION_DECL
)
594 DECL_ALIGN (t
) = FUNCTION_BOUNDARY
;
595 DECL_MODE (t
) = FUNCTION_MODE
;
599 /* We have not yet computed the alias set for this declaration. */
600 DECL_POINTER_ALIAS_SET (t
) = -1;
602 DECL_SOURCE_LOCATION (t
) = input_location
;
603 DECL_UID (t
) = next_decl_uid
++;
608 TYPE_UID (t
) = next_type_uid
++;
609 TYPE_ALIGN (t
) = BITS_PER_UNIT
;
610 TYPE_USER_ALIGN (t
) = 0;
611 TYPE_MAIN_VARIANT (t
) = t
;
612 TYPE_CANONICAL (t
) = t
;
614 /* Default to no attributes for type, but let target change that. */
615 TYPE_ATTRIBUTES (t
) = NULL_TREE
;
616 targetm
.set_default_type_attributes (t
);
618 /* We have not yet computed the alias set for this type. */
619 TYPE_ALIAS_SET (t
) = -1;
623 TREE_CONSTANT (t
) = 1;
624 TREE_INVARIANT (t
) = 1;
633 case PREDECREMENT_EXPR
:
634 case PREINCREMENT_EXPR
:
635 case POSTDECREMENT_EXPR
:
636 case POSTINCREMENT_EXPR
:
637 /* All of these have side-effects, no matter what their
639 TREE_SIDE_EFFECTS (t
) = 1;
647 case tcc_gimple_stmt
:
650 case GIMPLE_MODIFY_STMT
:
651 TREE_SIDE_EFFECTS (t
) = 1;
659 /* Other classes need no special treatment. */
666 /* Return a new node with the same contents as NODE except that its
667 TREE_CHAIN is zero and it has a fresh uid. */
670 copy_node_stat (tree node MEM_STAT_DECL
)
673 enum tree_code code
= TREE_CODE (node
);
676 gcc_assert (code
!= STATEMENT_LIST
);
678 length
= tree_size (node
);
679 t
= ggc_alloc_zone_pass_stat (length
, &tree_zone
);
680 memcpy (t
, node
, length
);
682 if (!GIMPLE_TUPLE_P (node
))
684 TREE_ASM_WRITTEN (t
) = 0;
685 TREE_VISITED (t
) = 0;
688 if (TREE_CODE_CLASS (code
) == tcc_declaration
)
690 DECL_UID (t
) = next_decl_uid
++;
691 if ((TREE_CODE (node
) == PARM_DECL
|| TREE_CODE (node
) == VAR_DECL
)
692 && DECL_HAS_VALUE_EXPR_P (node
))
694 SET_DECL_VALUE_EXPR (t
, DECL_VALUE_EXPR (node
));
695 DECL_HAS_VALUE_EXPR_P (t
) = 1;
697 if (TREE_CODE (node
) == VAR_DECL
&& DECL_HAS_INIT_PRIORITY_P (node
))
699 SET_DECL_INIT_PRIORITY (t
, DECL_INIT_PRIORITY (node
));
700 DECL_HAS_INIT_PRIORITY_P (t
) = 1;
702 if (TREE_CODE (node
) == VAR_DECL
&& DECL_BASED_ON_RESTRICT_P (node
))
704 SET_DECL_RESTRICT_BASE (t
, DECL_GET_RESTRICT_BASE (node
));
705 DECL_BASED_ON_RESTRICT_P (t
) = 1;
708 else if (TREE_CODE_CLASS (code
) == tcc_type
)
710 TYPE_UID (t
) = next_type_uid
++;
711 /* The following is so that the debug code for
712 the copy is different from the original type.
713 The two statements usually duplicate each other
714 (because they clear fields of the same union),
715 but the optimizer should catch that. */
716 TYPE_SYMTAB_POINTER (t
) = 0;
717 TYPE_SYMTAB_ADDRESS (t
) = 0;
719 /* Do not copy the values cache. */
720 if (TYPE_CACHED_VALUES_P(t
))
722 TYPE_CACHED_VALUES_P (t
) = 0;
723 TYPE_CACHED_VALUES (t
) = NULL_TREE
;
730 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
731 For example, this can copy a list made of TREE_LIST nodes. */
734 copy_list (tree list
)
742 head
= prev
= copy_node (list
);
743 next
= TREE_CHAIN (list
);
746 TREE_CHAIN (prev
) = copy_node (next
);
747 prev
= TREE_CHAIN (prev
);
748 next
= TREE_CHAIN (next
);
754 /* Create an INT_CST node with a LOW value sign extended. */
757 build_int_cst (tree type
, HOST_WIDE_INT low
)
759 /* Support legacy code. */
761 type
= integer_type_node
;
763 return build_int_cst_wide (type
, low
, low
< 0 ? -1 : 0);
766 /* Create an INT_CST node with a LOW value zero extended. */
769 build_int_cstu (tree type
, unsigned HOST_WIDE_INT low
)
771 return build_int_cst_wide (type
, low
, 0);
774 /* Create an INT_CST node with a LOW value in TYPE. The value is sign extended
775 if it is negative. This function is similar to build_int_cst, but
776 the extra bits outside of the type precision are cleared. Constants
777 with these extra bits may confuse the fold so that it detects overflows
778 even in cases when they do not occur, and in general should be avoided.
779 We cannot however make this a default behavior of build_int_cst without
780 more intrusive changes, since there are parts of gcc that rely on the extra
781 precision of the integer constants. */
784 build_int_cst_type (tree type
, HOST_WIDE_INT low
)
786 unsigned HOST_WIDE_INT low1
;
791 fit_double_type (low
, low
< 0 ? -1 : 0, &low1
, &hi
, type
);
793 return build_int_cst_wide (type
, low1
, hi
);
796 /* Create an INT_CST node of TYPE and value HI:LOW. The value is truncated
797 and sign extended according to the value range of TYPE. */
800 build_int_cst_wide_type (tree type
,
801 unsigned HOST_WIDE_INT low
, HOST_WIDE_INT high
)
803 fit_double_type (low
, high
, &low
, &high
, type
);
804 return build_int_cst_wide (type
, low
, high
);
807 /* These are the hash table functions for the hash table of INTEGER_CST
808 nodes of a sizetype. */
810 /* Return the hash code code X, an INTEGER_CST. */
813 int_cst_hash_hash (const void *x
)
815 const_tree
const t
= (const_tree
) x
;
817 return (TREE_INT_CST_HIGH (t
) ^ TREE_INT_CST_LOW (t
)
818 ^ htab_hash_pointer (TREE_TYPE (t
)));
821 /* Return nonzero if the value represented by *X (an INTEGER_CST tree node)
822 is the same as that given by *Y, which is the same. */
825 int_cst_hash_eq (const void *x
, const void *y
)
827 const_tree
const xt
= (const_tree
) x
;
828 const_tree
const yt
= (const_tree
) y
;
830 return (TREE_TYPE (xt
) == TREE_TYPE (yt
)
831 && TREE_INT_CST_HIGH (xt
) == TREE_INT_CST_HIGH (yt
)
832 && TREE_INT_CST_LOW (xt
) == TREE_INT_CST_LOW (yt
));
835 /* Create an INT_CST node of TYPE and value HI:LOW.
836 The returned node is always shared. For small integers we use a
837 per-type vector cache, for larger ones we use a single hash table. */
840 build_int_cst_wide (tree type
, unsigned HOST_WIDE_INT low
, HOST_WIDE_INT hi
)
848 switch (TREE_CODE (type
))
852 /* Cache NULL pointer. */
861 /* Cache false or true. */
869 if (TYPE_UNSIGNED (type
))
872 limit
= INTEGER_SHARE_LIMIT
;
873 if (!hi
&& low
< (unsigned HOST_WIDE_INT
)INTEGER_SHARE_LIMIT
)
879 limit
= INTEGER_SHARE_LIMIT
+ 1;
880 if (!hi
&& low
< (unsigned HOST_WIDE_INT
)INTEGER_SHARE_LIMIT
)
882 else if (hi
== -1 && low
== -(unsigned HOST_WIDE_INT
)1)
896 /* Look for it in the type's vector of small shared ints. */
897 if (!TYPE_CACHED_VALUES_P (type
))
899 TYPE_CACHED_VALUES_P (type
) = 1;
900 TYPE_CACHED_VALUES (type
) = make_tree_vec (limit
);
903 t
= TREE_VEC_ELT (TYPE_CACHED_VALUES (type
), ix
);
906 /* Make sure no one is clobbering the shared constant. */
907 gcc_assert (TREE_TYPE (t
) == type
);
908 gcc_assert (TREE_INT_CST_LOW (t
) == low
);
909 gcc_assert (TREE_INT_CST_HIGH (t
) == hi
);
913 /* Create a new shared int. */
914 t
= make_node (INTEGER_CST
);
916 TREE_INT_CST_LOW (t
) = low
;
917 TREE_INT_CST_HIGH (t
) = hi
;
918 TREE_TYPE (t
) = type
;
920 TREE_VEC_ELT (TYPE_CACHED_VALUES (type
), ix
) = t
;
925 /* Use the cache of larger shared ints. */
928 TREE_INT_CST_LOW (int_cst_node
) = low
;
929 TREE_INT_CST_HIGH (int_cst_node
) = hi
;
930 TREE_TYPE (int_cst_node
) = type
;
932 slot
= htab_find_slot (int_cst_hash_table
, int_cst_node
, INSERT
);
936 /* Insert this one into the hash table. */
939 /* Make a new node for next time round. */
940 int_cst_node
= make_node (INTEGER_CST
);
947 /* Builds an integer constant in TYPE such that lowest BITS bits are ones
948 and the rest are zeros. */
951 build_low_bits_mask (tree type
, unsigned bits
)
953 unsigned HOST_WIDE_INT low
;
955 unsigned HOST_WIDE_INT all_ones
= ~(unsigned HOST_WIDE_INT
) 0;
957 gcc_assert (bits
<= TYPE_PRECISION (type
));
959 if (bits
== TYPE_PRECISION (type
)
960 && !TYPE_UNSIGNED (type
))
962 /* Sign extended all-ones mask. */
966 else if (bits
<= HOST_BITS_PER_WIDE_INT
)
968 low
= all_ones
>> (HOST_BITS_PER_WIDE_INT
- bits
);
973 bits
-= HOST_BITS_PER_WIDE_INT
;
975 high
= all_ones
>> (HOST_BITS_PER_WIDE_INT
- bits
);
978 return build_int_cst_wide (type
, low
, high
);
981 /* Checks that X is integer constant that can be expressed in (unsigned)
982 HOST_WIDE_INT without loss of precision. */
985 cst_and_fits_in_hwi (const_tree x
)
987 if (TREE_CODE (x
) != INTEGER_CST
)
990 if (TYPE_PRECISION (TREE_TYPE (x
)) > HOST_BITS_PER_WIDE_INT
)
993 return (TREE_INT_CST_HIGH (x
) == 0
994 || TREE_INT_CST_HIGH (x
) == -1);
997 /* Return a new VECTOR_CST node whose type is TYPE and whose values
998 are in a list pointed to by VALS. */
1001 build_vector (tree type
, tree vals
)
1003 tree v
= make_node (VECTOR_CST
);
1007 TREE_VECTOR_CST_ELTS (v
) = vals
;
1008 TREE_TYPE (v
) = type
;
1010 /* Iterate through elements and check for overflow. */
1011 for (link
= vals
; link
; link
= TREE_CHAIN (link
))
1013 tree value
= TREE_VALUE (link
);
1015 /* Don't crash if we get an address constant. */
1016 if (!CONSTANT_CLASS_P (value
))
1019 over
|= TREE_OVERFLOW (value
);
1022 TREE_OVERFLOW (v
) = over
;
1026 /* Return a new VECTOR_CST node whose type is TYPE and whose values
1027 are extracted from V, a vector of CONSTRUCTOR_ELT. */
1030 build_vector_from_ctor (tree type
, VEC(constructor_elt
,gc
) *v
)
1032 tree list
= NULL_TREE
;
1033 unsigned HOST_WIDE_INT idx
;
1036 FOR_EACH_CONSTRUCTOR_VALUE (v
, idx
, value
)
1037 list
= tree_cons (NULL_TREE
, value
, list
);
1038 return build_vector (type
, nreverse (list
));
1041 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
1042 are in the VEC pointed to by VALS. */
1044 build_constructor (tree type
, VEC(constructor_elt
,gc
) *vals
)
1046 tree c
= make_node (CONSTRUCTOR
);
1047 TREE_TYPE (c
) = type
;
1048 CONSTRUCTOR_ELTS (c
) = vals
;
1052 /* Build a CONSTRUCTOR node made of a single initializer, with the specified
1055 build_constructor_single (tree type
, tree index
, tree value
)
1057 VEC(constructor_elt
,gc
) *v
;
1058 constructor_elt
*elt
;
1061 v
= VEC_alloc (constructor_elt
, gc
, 1);
1062 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
1066 t
= build_constructor (type
, v
);
1067 TREE_CONSTANT (t
) = TREE_CONSTANT (value
);
1072 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
1073 are in a list pointed to by VALS. */
1075 build_constructor_from_list (tree type
, tree vals
)
1078 VEC(constructor_elt
,gc
) *v
= NULL
;
1079 bool constant_p
= true;
1083 v
= VEC_alloc (constructor_elt
, gc
, list_length (vals
));
1084 for (t
= vals
; t
; t
= TREE_CHAIN (t
))
1086 constructor_elt
*elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
1087 val
= TREE_VALUE (t
);
1088 elt
->index
= TREE_PURPOSE (t
);
1090 if (!TREE_CONSTANT (val
))
1095 t
= build_constructor (type
, v
);
1096 TREE_CONSTANT (t
) = constant_p
;
1100 /* Return a new FIXED_CST node whose type is TYPE and value is F. */
1103 build_fixed (tree type
, FIXED_VALUE_TYPE f
)
1106 FIXED_VALUE_TYPE
*fp
;
1108 v
= make_node (FIXED_CST
);
1109 fp
= ggc_alloc (sizeof (FIXED_VALUE_TYPE
));
1110 memcpy (fp
, &f
, sizeof (FIXED_VALUE_TYPE
));
1112 TREE_TYPE (v
) = type
;
1113 TREE_FIXED_CST_PTR (v
) = fp
;
1117 /* Return a new REAL_CST node whose type is TYPE and value is D. */
1120 build_real (tree type
, REAL_VALUE_TYPE d
)
1123 REAL_VALUE_TYPE
*dp
;
1126 /* ??? Used to check for overflow here via CHECK_FLOAT_TYPE.
1127 Consider doing it via real_convert now. */
1129 v
= make_node (REAL_CST
);
1130 dp
= ggc_alloc (sizeof (REAL_VALUE_TYPE
));
1131 memcpy (dp
, &d
, sizeof (REAL_VALUE_TYPE
));
1133 TREE_TYPE (v
) = type
;
1134 TREE_REAL_CST_PTR (v
) = dp
;
1135 TREE_OVERFLOW (v
) = overflow
;
1139 /* Return a new REAL_CST node whose type is TYPE
1140 and whose value is the integer value of the INTEGER_CST node I. */
1143 real_value_from_int_cst (const_tree type
, const_tree i
)
1147 /* Clear all bits of the real value type so that we can later do
1148 bitwise comparisons to see if two values are the same. */
1149 memset (&d
, 0, sizeof d
);
1151 real_from_integer (&d
, type
? TYPE_MODE (type
) : VOIDmode
,
1152 TREE_INT_CST_LOW (i
), TREE_INT_CST_HIGH (i
),
1153 TYPE_UNSIGNED (TREE_TYPE (i
)));
1157 /* Given a tree representing an integer constant I, return a tree
1158 representing the same value as a floating-point constant of type TYPE. */
1161 build_real_from_int_cst (tree type
, const_tree i
)
1164 int overflow
= TREE_OVERFLOW (i
);
1166 v
= build_real (type
, real_value_from_int_cst (type
, i
));
1168 TREE_OVERFLOW (v
) |= overflow
;
1172 /* Return a newly constructed STRING_CST node whose value is
1173 the LEN characters at STR.
1174 The TREE_TYPE is not initialized. */
1177 build_string (int len
, const char *str
)
1182 /* Do not waste bytes provided by padding of struct tree_string. */
1183 length
= len
+ offsetof (struct tree_string
, str
) + 1;
1185 #ifdef GATHER_STATISTICS
1186 tree_node_counts
[(int) c_kind
]++;
1187 tree_node_sizes
[(int) c_kind
] += length
;
1190 s
= ggc_alloc_tree (length
);
1192 memset (s
, 0, sizeof (struct tree_common
));
1193 TREE_SET_CODE (s
, STRING_CST
);
1194 TREE_CONSTANT (s
) = 1;
1195 TREE_INVARIANT (s
) = 1;
1196 TREE_STRING_LENGTH (s
) = len
;
1197 memcpy (CONST_CAST (TREE_STRING_POINTER (s
)), str
, len
);
1198 ((char *) CONST_CAST (TREE_STRING_POINTER (s
)))[len
] = '\0';
1203 /* Return a newly constructed COMPLEX_CST node whose value is
1204 specified by the real and imaginary parts REAL and IMAG.
1205 Both REAL and IMAG should be constant nodes. TYPE, if specified,
1206 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
1209 build_complex (tree type
, tree real
, tree imag
)
1211 tree t
= make_node (COMPLEX_CST
);
1213 TREE_REALPART (t
) = real
;
1214 TREE_IMAGPART (t
) = imag
;
1215 TREE_TYPE (t
) = type
? type
: build_complex_type (TREE_TYPE (real
));
1216 TREE_OVERFLOW (t
) = TREE_OVERFLOW (real
) | TREE_OVERFLOW (imag
);
1220 /* Return a constant of arithmetic type TYPE which is the
1221 multiplicative identity of the set TYPE. */
1224 build_one_cst (tree type
)
1226 switch (TREE_CODE (type
))
1228 case INTEGER_TYPE
: case ENUMERAL_TYPE
: case BOOLEAN_TYPE
:
1229 case POINTER_TYPE
: case REFERENCE_TYPE
:
1231 return build_int_cst (type
, 1);
1234 return build_real (type
, dconst1
);
1236 case FIXED_POINT_TYPE
:
1237 /* We can only generate 1 for accum types. */
1238 gcc_assert (ALL_SCALAR_ACCUM_MODE_P (TYPE_MODE (type
)));
1239 return build_fixed (type
, FCONST1(TYPE_MODE (type
)));
1246 scalar
= build_one_cst (TREE_TYPE (type
));
1248 /* Create 'vect_cst_ = {cst,cst,...,cst}' */
1250 for (i
= TYPE_VECTOR_SUBPARTS (type
); --i
>= 0; )
1251 cst
= tree_cons (NULL_TREE
, scalar
, cst
);
1253 return build_vector (type
, cst
);
1257 return build_complex (type
,
1258 build_one_cst (TREE_TYPE (type
)),
1259 fold_convert (TREE_TYPE (type
), integer_zero_node
));
1266 /* Build a BINFO with LEN language slots. */
1269 make_tree_binfo_stat (unsigned base_binfos MEM_STAT_DECL
)
1272 size_t length
= (offsetof (struct tree_binfo
, base_binfos
)
1273 + VEC_embedded_size (tree
, base_binfos
));
1275 #ifdef GATHER_STATISTICS
1276 tree_node_counts
[(int) binfo_kind
]++;
1277 tree_node_sizes
[(int) binfo_kind
] += length
;
1280 t
= ggc_alloc_zone_pass_stat (length
, &tree_zone
);
1282 memset (t
, 0, offsetof (struct tree_binfo
, base_binfos
));
1284 TREE_SET_CODE (t
, TREE_BINFO
);
1286 VEC_embedded_init (tree
, BINFO_BASE_BINFOS (t
), base_binfos
);
1292 /* Build a newly constructed TREE_VEC node of length LEN. */
1295 make_tree_vec_stat (int len MEM_STAT_DECL
)
1298 int length
= (len
- 1) * sizeof (tree
) + sizeof (struct tree_vec
);
1300 #ifdef GATHER_STATISTICS
1301 tree_node_counts
[(int) vec_kind
]++;
1302 tree_node_sizes
[(int) vec_kind
] += length
;
1305 t
= ggc_alloc_zone_pass_stat (length
, &tree_zone
);
1307 memset (t
, 0, length
);
1309 TREE_SET_CODE (t
, TREE_VEC
);
1310 TREE_VEC_LENGTH (t
) = len
;
1315 /* Return 1 if EXPR is the integer constant zero or a complex constant
1319 integer_zerop (const_tree expr
)
1323 return ((TREE_CODE (expr
) == INTEGER_CST
1324 && TREE_INT_CST_LOW (expr
) == 0
1325 && TREE_INT_CST_HIGH (expr
) == 0)
1326 || (TREE_CODE (expr
) == COMPLEX_CST
1327 && integer_zerop (TREE_REALPART (expr
))
1328 && integer_zerop (TREE_IMAGPART (expr
))));
1331 /* Return 1 if EXPR is the integer constant one or the corresponding
1332 complex constant. */
1335 integer_onep (const_tree expr
)
1339 return ((TREE_CODE (expr
) == INTEGER_CST
1340 && TREE_INT_CST_LOW (expr
) == 1
1341 && TREE_INT_CST_HIGH (expr
) == 0)
1342 || (TREE_CODE (expr
) == COMPLEX_CST
1343 && integer_onep (TREE_REALPART (expr
))
1344 && integer_zerop (TREE_IMAGPART (expr
))));
1347 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
1348 it contains. Likewise for the corresponding complex constant. */
1351 integer_all_onesp (const_tree expr
)
1358 if (TREE_CODE (expr
) == COMPLEX_CST
1359 && integer_all_onesp (TREE_REALPART (expr
))
1360 && integer_zerop (TREE_IMAGPART (expr
)))
1363 else if (TREE_CODE (expr
) != INTEGER_CST
)
1366 uns
= TYPE_UNSIGNED (TREE_TYPE (expr
));
1367 if (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
1368 && TREE_INT_CST_HIGH (expr
) == -1)
1373 /* Note that using TYPE_PRECISION here is wrong. We care about the
1374 actual bits, not the (arbitrary) range of the type. */
1375 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr
)));
1376 if (prec
>= HOST_BITS_PER_WIDE_INT
)
1378 HOST_WIDE_INT high_value
;
1381 shift_amount
= prec
- HOST_BITS_PER_WIDE_INT
;
1383 /* Can not handle precisions greater than twice the host int size. */
1384 gcc_assert (shift_amount
<= HOST_BITS_PER_WIDE_INT
);
1385 if (shift_amount
== HOST_BITS_PER_WIDE_INT
)
1386 /* Shifting by the host word size is undefined according to the ANSI
1387 standard, so we must handle this as a special case. */
1390 high_value
= ((HOST_WIDE_INT
) 1 << shift_amount
) - 1;
1392 return (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
1393 && TREE_INT_CST_HIGH (expr
) == high_value
);
1396 return TREE_INT_CST_LOW (expr
) == ((unsigned HOST_WIDE_INT
) 1 << prec
) - 1;
1399 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
1403 integer_pow2p (const_tree expr
)
1406 HOST_WIDE_INT high
, low
;
1410 if (TREE_CODE (expr
) == COMPLEX_CST
1411 && integer_pow2p (TREE_REALPART (expr
))
1412 && integer_zerop (TREE_IMAGPART (expr
)))
1415 if (TREE_CODE (expr
) != INTEGER_CST
)
1418 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
1419 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
1420 high
= TREE_INT_CST_HIGH (expr
);
1421 low
= TREE_INT_CST_LOW (expr
);
1423 /* First clear all bits that are beyond the type's precision in case
1424 we've been sign extended. */
1426 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
1428 else if (prec
> HOST_BITS_PER_WIDE_INT
)
1429 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
1433 if (prec
< HOST_BITS_PER_WIDE_INT
)
1434 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
1437 if (high
== 0 && low
== 0)
1440 return ((high
== 0 && (low
& (low
- 1)) == 0)
1441 || (low
== 0 && (high
& (high
- 1)) == 0));
1444 /* Return 1 if EXPR is an integer constant other than zero or a
1445 complex constant other than zero. */
1448 integer_nonzerop (const_tree expr
)
1452 return ((TREE_CODE (expr
) == INTEGER_CST
1453 && (TREE_INT_CST_LOW (expr
) != 0
1454 || TREE_INT_CST_HIGH (expr
) != 0))
1455 || (TREE_CODE (expr
) == COMPLEX_CST
1456 && (integer_nonzerop (TREE_REALPART (expr
))
1457 || integer_nonzerop (TREE_IMAGPART (expr
)))));
1460 /* Return 1 if EXPR is the fixed-point constant zero. */
1463 fixed_zerop (const_tree expr
)
1465 return (TREE_CODE (expr
) == FIXED_CST
1466 && double_int_zero_p (TREE_FIXED_CST (expr
).data
));
1469 /* Return the power of two represented by a tree node known to be a
1473 tree_log2 (const_tree expr
)
1476 HOST_WIDE_INT high
, low
;
1480 if (TREE_CODE (expr
) == COMPLEX_CST
)
1481 return tree_log2 (TREE_REALPART (expr
));
1483 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
1484 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
1486 high
= TREE_INT_CST_HIGH (expr
);
1487 low
= TREE_INT_CST_LOW (expr
);
1489 /* First clear all bits that are beyond the type's precision in case
1490 we've been sign extended. */
1492 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
1494 else if (prec
> HOST_BITS_PER_WIDE_INT
)
1495 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
1499 if (prec
< HOST_BITS_PER_WIDE_INT
)
1500 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
1503 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ exact_log2 (high
)
1504 : exact_log2 (low
));
1507 /* Similar, but return the largest integer Y such that 2 ** Y is less
1508 than or equal to EXPR. */
1511 tree_floor_log2 (const_tree expr
)
1514 HOST_WIDE_INT high
, low
;
1518 if (TREE_CODE (expr
) == COMPLEX_CST
)
1519 return tree_log2 (TREE_REALPART (expr
));
1521 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
1522 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
1524 high
= TREE_INT_CST_HIGH (expr
);
1525 low
= TREE_INT_CST_LOW (expr
);
1527 /* First clear all bits that are beyond the type's precision in case
1528 we've been sign extended. Ignore if type's precision hasn't been set
1529 since what we are doing is setting it. */
1531 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
|| prec
== 0)
1533 else if (prec
> HOST_BITS_PER_WIDE_INT
)
1534 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
1538 if (prec
< HOST_BITS_PER_WIDE_INT
)
1539 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
1542 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ floor_log2 (high
)
1543 : floor_log2 (low
));
1546 /* Return 1 if EXPR is the real constant zero. */
1549 real_zerop (const_tree expr
)
1553 return ((TREE_CODE (expr
) == REAL_CST
1554 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst0
))
1555 || (TREE_CODE (expr
) == COMPLEX_CST
1556 && real_zerop (TREE_REALPART (expr
))
1557 && real_zerop (TREE_IMAGPART (expr
))));
1560 /* Return 1 if EXPR is the real constant one in real or complex form. */
1563 real_onep (const_tree expr
)
1567 return ((TREE_CODE (expr
) == REAL_CST
1568 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst1
))
1569 || (TREE_CODE (expr
) == COMPLEX_CST
1570 && real_onep (TREE_REALPART (expr
))
1571 && real_zerop (TREE_IMAGPART (expr
))));
1574 /* Return 1 if EXPR is the real constant two. */
1577 real_twop (const_tree expr
)
1581 return ((TREE_CODE (expr
) == REAL_CST
1582 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst2
))
1583 || (TREE_CODE (expr
) == COMPLEX_CST
1584 && real_twop (TREE_REALPART (expr
))
1585 && real_zerop (TREE_IMAGPART (expr
))));
1588 /* Return 1 if EXPR is the real constant minus one. */
1591 real_minus_onep (const_tree expr
)
1595 return ((TREE_CODE (expr
) == REAL_CST
1596 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconstm1
))
1597 || (TREE_CODE (expr
) == COMPLEX_CST
1598 && real_minus_onep (TREE_REALPART (expr
))
1599 && real_zerop (TREE_IMAGPART (expr
))));
1602 /* Nonzero if EXP is a constant or a cast of a constant. */
1605 really_constant_p (const_tree exp
)
1607 /* This is not quite the same as STRIP_NOPS. It does more. */
1608 while (TREE_CODE (exp
) == NOP_EXPR
1609 || TREE_CODE (exp
) == CONVERT_EXPR
1610 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
1611 exp
= TREE_OPERAND (exp
, 0);
1612 return TREE_CONSTANT (exp
);
1615 /* Return first list element whose TREE_VALUE is ELEM.
1616 Return 0 if ELEM is not in LIST. */
1619 value_member (tree elem
, tree list
)
1623 if (elem
== TREE_VALUE (list
))
1625 list
= TREE_CHAIN (list
);
1630 /* Return first list element whose TREE_PURPOSE is ELEM.
1631 Return 0 if ELEM is not in LIST. */
1634 purpose_member (const_tree elem
, tree list
)
1638 if (elem
== TREE_PURPOSE (list
))
1640 list
= TREE_CHAIN (list
);
1645 /* Return nonzero if ELEM is part of the chain CHAIN. */
1648 chain_member (const_tree elem
, const_tree chain
)
1654 chain
= TREE_CHAIN (chain
);
1660 /* Return the length of a chain of nodes chained through TREE_CHAIN.
1661 We expect a null pointer to mark the end of the chain.
1662 This is the Lisp primitive `length'. */
1665 list_length (const_tree t
)
1668 #ifdef ENABLE_TREE_CHECKING
1676 #ifdef ENABLE_TREE_CHECKING
1679 gcc_assert (p
!= q
);
1687 /* Returns the number of FIELD_DECLs in TYPE. */
1690 fields_length (const_tree type
)
1692 tree t
= TYPE_FIELDS (type
);
1695 for (; t
; t
= TREE_CHAIN (t
))
1696 if (TREE_CODE (t
) == FIELD_DECL
)
1702 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
1703 by modifying the last node in chain 1 to point to chain 2.
1704 This is the Lisp primitive `nconc'. */
1707 chainon (tree op1
, tree op2
)
1716 for (t1
= op1
; TREE_CHAIN (t1
); t1
= TREE_CHAIN (t1
))
1718 TREE_CHAIN (t1
) = op2
;
1720 #ifdef ENABLE_TREE_CHECKING
1723 for (t2
= op2
; t2
; t2
= TREE_CHAIN (t2
))
1724 gcc_assert (t2
!= t1
);
1731 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
1734 tree_last (tree chain
)
1738 while ((next
= TREE_CHAIN (chain
)))
1743 /* Reverse the order of elements in the chain T,
1744 and return the new head of the chain (old last element). */
1749 tree prev
= 0, decl
, next
;
1750 for (decl
= t
; decl
; decl
= next
)
1752 next
= TREE_CHAIN (decl
);
1753 TREE_CHAIN (decl
) = prev
;
1759 /* Return a newly created TREE_LIST node whose
1760 purpose and value fields are PARM and VALUE. */
1763 build_tree_list_stat (tree parm
, tree value MEM_STAT_DECL
)
1765 tree t
= make_node_stat (TREE_LIST PASS_MEM_STAT
);
1766 TREE_PURPOSE (t
) = parm
;
1767 TREE_VALUE (t
) = value
;
1771 /* Return a newly created TREE_LIST node whose
1772 purpose and value fields are PURPOSE and VALUE
1773 and whose TREE_CHAIN is CHAIN. */
1776 tree_cons_stat (tree purpose
, tree value
, tree chain MEM_STAT_DECL
)
1780 node
= ggc_alloc_zone_pass_stat (sizeof (struct tree_list
), &tree_zone
);
1782 memset (node
, 0, sizeof (struct tree_common
));
1784 #ifdef GATHER_STATISTICS
1785 tree_node_counts
[(int) x_kind
]++;
1786 tree_node_sizes
[(int) x_kind
] += sizeof (struct tree_list
);
1789 TREE_SET_CODE (node
, TREE_LIST
);
1790 TREE_CHAIN (node
) = chain
;
1791 TREE_PURPOSE (node
) = purpose
;
1792 TREE_VALUE (node
) = value
;
1797 /* Return the size nominally occupied by an object of type TYPE
1798 when it resides in memory. The value is measured in units of bytes,
1799 and its data type is that normally used for type sizes
1800 (which is the first type created by make_signed_type or
1801 make_unsigned_type). */
1804 size_in_bytes (tree type
)
1808 if (type
== error_mark_node
)
1809 return integer_zero_node
;
1811 type
= TYPE_MAIN_VARIANT (type
);
1812 t
= TYPE_SIZE_UNIT (type
);
1816 lang_hooks
.types
.incomplete_type_error (NULL_TREE
, type
);
1817 return size_zero_node
;
1823 /* Return the size of TYPE (in bytes) as a wide integer
1824 or return -1 if the size can vary or is larger than an integer. */
1827 int_size_in_bytes (const_tree type
)
1831 if (type
== error_mark_node
)
1834 type
= TYPE_MAIN_VARIANT (type
);
1835 t
= TYPE_SIZE_UNIT (type
);
1837 || TREE_CODE (t
) != INTEGER_CST
1838 || TREE_INT_CST_HIGH (t
) != 0
1839 /* If the result would appear negative, it's too big to represent. */
1840 || (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0)
1843 return TREE_INT_CST_LOW (t
);
1846 /* Return the maximum size of TYPE (in bytes) as a wide integer
1847 or return -1 if the size can vary or is larger than an integer. */
1850 max_int_size_in_bytes (tree type
)
1852 HOST_WIDE_INT size
= -1;
1855 /* If this is an array type, check for a possible MAX_SIZE attached. */
1857 if (TREE_CODE (type
) == ARRAY_TYPE
)
1859 size_tree
= TYPE_ARRAY_MAX_SIZE (type
);
1861 if (size_tree
&& host_integerp (size_tree
, 1))
1862 size
= tree_low_cst (size_tree
, 1);
1865 /* If we still haven't been able to get a size, see if the language
1866 can compute a maximum size. */
1870 size_tree
= lang_hooks
.types
.max_size (type
);
1872 if (size_tree
&& host_integerp (size_tree
, 1))
1873 size
= tree_low_cst (size_tree
, 1);
1879 /* Return the bit position of FIELD, in bits from the start of the record.
1880 This is a tree of type bitsizetype. */
1883 bit_position (const_tree field
)
1885 return bit_from_pos (DECL_FIELD_OFFSET (field
),
1886 DECL_FIELD_BIT_OFFSET (field
));
1889 /* Likewise, but return as an integer. It must be representable in
1890 that way (since it could be a signed value, we don't have the
1891 option of returning -1 like int_size_in_byte can. */
1894 int_bit_position (const_tree field
)
1896 return tree_low_cst (bit_position (field
), 0);
1899 /* Return the byte position of FIELD, in bytes from the start of the record.
1900 This is a tree of type sizetype. */
1903 byte_position (const_tree field
)
1905 return byte_from_pos (DECL_FIELD_OFFSET (field
),
1906 DECL_FIELD_BIT_OFFSET (field
));
1909 /* Likewise, but return as an integer. It must be representable in
1910 that way (since it could be a signed value, we don't have the
1911 option of returning -1 like int_size_in_byte can. */
1914 int_byte_position (const_tree field
)
1916 return tree_low_cst (byte_position (field
), 0);
1919 /* Return the strictest alignment, in bits, that T is known to have. */
1922 expr_align (const_tree t
)
1924 unsigned int align0
, align1
;
1926 switch (TREE_CODE (t
))
1928 case NOP_EXPR
: case CONVERT_EXPR
: case NON_LVALUE_EXPR
:
1929 /* If we have conversions, we know that the alignment of the
1930 object must meet each of the alignments of the types. */
1931 align0
= expr_align (TREE_OPERAND (t
, 0));
1932 align1
= TYPE_ALIGN (TREE_TYPE (t
));
1933 return MAX (align0
, align1
);
1935 case GIMPLE_MODIFY_STMT
:
1936 /* We should never ask for the alignment of a gimple statement. */
1939 case SAVE_EXPR
: case COMPOUND_EXPR
: case MODIFY_EXPR
:
1940 case INIT_EXPR
: case TARGET_EXPR
: case WITH_CLEANUP_EXPR
:
1941 case CLEANUP_POINT_EXPR
:
1942 /* These don't change the alignment of an object. */
1943 return expr_align (TREE_OPERAND (t
, 0));
1946 /* The best we can do is say that the alignment is the least aligned
1948 align0
= expr_align (TREE_OPERAND (t
, 1));
1949 align1
= expr_align (TREE_OPERAND (t
, 2));
1950 return MIN (align0
, align1
);
1952 /* FIXME: LABEL_DECL and CONST_DECL never have DECL_ALIGN set
1953 meaningfully, it's always 1. */
1954 case LABEL_DECL
: case CONST_DECL
:
1955 case VAR_DECL
: case PARM_DECL
: case RESULT_DECL
:
1957 gcc_assert (DECL_ALIGN (t
) != 0);
1958 return DECL_ALIGN (t
);
1964 /* Otherwise take the alignment from that of the type. */
1965 return TYPE_ALIGN (TREE_TYPE (t
));
1968 /* Return, as a tree node, the number of elements for TYPE (which is an
1969 ARRAY_TYPE) minus one. This counts only elements of the top array. */
1972 array_type_nelts (const_tree type
)
1974 tree index_type
, min
, max
;
1976 /* If they did it with unspecified bounds, then we should have already
1977 given an error about it before we got here. */
1978 if (! TYPE_DOMAIN (type
))
1979 return error_mark_node
;
1981 index_type
= TYPE_DOMAIN (type
);
1982 min
= TYPE_MIN_VALUE (index_type
);
1983 max
= TYPE_MAX_VALUE (index_type
);
1985 return (integer_zerop (min
)
1987 : fold_build2 (MINUS_EXPR
, TREE_TYPE (max
), max
, min
));
1990 /* If arg is static -- a reference to an object in static storage -- then
1991 return the object. This is not the same as the C meaning of `static'.
1992 If arg isn't static, return NULL. */
1997 switch (TREE_CODE (arg
))
2000 /* Nested functions are static, even though taking their address will
2001 involve a trampoline as we unnest the nested function and create
2002 the trampoline on the tree level. */
2006 return ((TREE_STATIC (arg
) || DECL_EXTERNAL (arg
))
2007 && ! DECL_THREAD_LOCAL_P (arg
)
2008 && ! DECL_DLLIMPORT_P (arg
)
2012 return ((TREE_STATIC (arg
) || DECL_EXTERNAL (arg
))
2016 return TREE_STATIC (arg
) ? arg
: NULL
;
2023 /* If the thing being referenced is not a field, then it is
2024 something language specific. */
2025 if (TREE_CODE (TREE_OPERAND (arg
, 1)) != FIELD_DECL
)
2026 return (*lang_hooks
.staticp
) (arg
);
2028 /* If we are referencing a bitfield, we can't evaluate an
2029 ADDR_EXPR at compile time and so it isn't a constant. */
2030 if (DECL_BIT_FIELD (TREE_OPERAND (arg
, 1)))
2033 return staticp (TREE_OPERAND (arg
, 0));
2038 case MISALIGNED_INDIRECT_REF
:
2039 case ALIGN_INDIRECT_REF
:
2041 return TREE_CONSTANT (TREE_OPERAND (arg
, 0)) ? arg
: NULL
;
2044 case ARRAY_RANGE_REF
:
2045 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg
))) == INTEGER_CST
2046 && TREE_CODE (TREE_OPERAND (arg
, 1)) == INTEGER_CST
)
2047 return staticp (TREE_OPERAND (arg
, 0));
2052 if ((unsigned int) TREE_CODE (arg
)
2053 >= (unsigned int) LAST_AND_UNUSED_TREE_CODE
)
2054 return lang_hooks
.staticp (arg
);
2060 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
2061 Do this to any expression which may be used in more than one place,
2062 but must be evaluated only once.
2064 Normally, expand_expr would reevaluate the expression each time.
2065 Calling save_expr produces something that is evaluated and recorded
2066 the first time expand_expr is called on it. Subsequent calls to
2067 expand_expr just reuse the recorded value.
2069 The call to expand_expr that generates code that actually computes
2070 the value is the first call *at compile time*. Subsequent calls
2071 *at compile time* generate code to use the saved value.
2072 This produces correct result provided that *at run time* control
2073 always flows through the insns made by the first expand_expr
2074 before reaching the other places where the save_expr was evaluated.
2075 You, the caller of save_expr, must make sure this is so.
2077 Constants, and certain read-only nodes, are returned with no
2078 SAVE_EXPR because that is safe. Expressions containing placeholders
2079 are not touched; see tree.def for an explanation of what these
2083 save_expr (tree expr
)
2085 tree t
= fold (expr
);
2088 /* If the tree evaluates to a constant, then we don't want to hide that
2089 fact (i.e. this allows further folding, and direct checks for constants).
2090 However, a read-only object that has side effects cannot be bypassed.
2091 Since it is no problem to reevaluate literals, we just return the
2093 inner
= skip_simple_arithmetic (t
);
2095 if (TREE_INVARIANT (inner
)
2096 || (TREE_READONLY (inner
) && ! TREE_SIDE_EFFECTS (inner
))
2097 || TREE_CODE (inner
) == SAVE_EXPR
2098 || TREE_CODE (inner
) == ERROR_MARK
)
2101 /* If INNER contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
2102 it means that the size or offset of some field of an object depends on
2103 the value within another field.
2105 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
2106 and some variable since it would then need to be both evaluated once and
2107 evaluated more than once. Front-ends must assure this case cannot
2108 happen by surrounding any such subexpressions in their own SAVE_EXPR
2109 and forcing evaluation at the proper time. */
2110 if (contains_placeholder_p (inner
))
2113 t
= build1 (SAVE_EXPR
, TREE_TYPE (expr
), t
);
2115 /* This expression might be placed ahead of a jump to ensure that the
2116 value was computed on both sides of the jump. So make sure it isn't
2117 eliminated as dead. */
2118 TREE_SIDE_EFFECTS (t
) = 1;
2119 TREE_INVARIANT (t
) = 1;
2123 /* Look inside EXPR and into any simple arithmetic operations. Return
2124 the innermost non-arithmetic node. */
2127 skip_simple_arithmetic (tree expr
)
2131 /* We don't care about whether this can be used as an lvalue in this
2133 while (TREE_CODE (expr
) == NON_LVALUE_EXPR
)
2134 expr
= TREE_OPERAND (expr
, 0);
2136 /* If we have simple operations applied to a SAVE_EXPR or to a SAVE_EXPR and
2137 a constant, it will be more efficient to not make another SAVE_EXPR since
2138 it will allow better simplification and GCSE will be able to merge the
2139 computations if they actually occur. */
2143 if (UNARY_CLASS_P (inner
))
2144 inner
= TREE_OPERAND (inner
, 0);
2145 else if (BINARY_CLASS_P (inner
))
2147 if (TREE_INVARIANT (TREE_OPERAND (inner
, 1)))
2148 inner
= TREE_OPERAND (inner
, 0);
2149 else if (TREE_INVARIANT (TREE_OPERAND (inner
, 0)))
2150 inner
= TREE_OPERAND (inner
, 1);
2161 /* Return which tree structure is used by T. */
2163 enum tree_node_structure_enum
2164 tree_node_structure (const_tree t
)
2166 const enum tree_code code
= TREE_CODE (t
);
2168 switch (TREE_CODE_CLASS (code
))
2170 case tcc_declaration
:
2175 return TS_FIELD_DECL
;
2177 return TS_PARM_DECL
;
2181 return TS_LABEL_DECL
;
2183 return TS_RESULT_DECL
;
2185 return TS_CONST_DECL
;
2187 return TS_TYPE_DECL
;
2189 return TS_FUNCTION_DECL
;
2190 case SYMBOL_MEMORY_TAG
:
2191 case NAME_MEMORY_TAG
:
2192 case STRUCT_FIELD_TAG
:
2193 case MEMORY_PARTITION_TAG
:
2194 return TS_MEMORY_TAG
;
2196 return TS_DECL_NON_COMMON
;
2202 case tcc_comparison
:
2205 case tcc_expression
:
2209 case tcc_gimple_stmt
:
2210 return TS_GIMPLE_STATEMENT
;
2211 default: /* tcc_constant and tcc_exceptional */
2216 /* tcc_constant cases. */
2217 case INTEGER_CST
: return TS_INT_CST
;
2218 case REAL_CST
: return TS_REAL_CST
;
2219 case FIXED_CST
: return TS_FIXED_CST
;
2220 case COMPLEX_CST
: return TS_COMPLEX
;
2221 case VECTOR_CST
: return TS_VECTOR
;
2222 case STRING_CST
: return TS_STRING
;
2223 /* tcc_exceptional cases. */
2224 /* FIXME tuples: eventually this should be TS_BASE. For now, nothing
2226 case ERROR_MARK
: return TS_COMMON
;
2227 case IDENTIFIER_NODE
: return TS_IDENTIFIER
;
2228 case TREE_LIST
: return TS_LIST
;
2229 case TREE_VEC
: return TS_VEC
;
2230 case PHI_NODE
: return TS_PHI_NODE
;
2231 case SSA_NAME
: return TS_SSA_NAME
;
2232 case PLACEHOLDER_EXPR
: return TS_COMMON
;
2233 case STATEMENT_LIST
: return TS_STATEMENT_LIST
;
2234 case BLOCK
: return TS_BLOCK
;
2235 case CONSTRUCTOR
: return TS_CONSTRUCTOR
;
2236 case TREE_BINFO
: return TS_BINFO
;
2237 case VALUE_HANDLE
: return TS_VALUE_HANDLE
;
2238 case OMP_CLAUSE
: return TS_OMP_CLAUSE
;
2245 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
2246 or offset that depends on a field within a record. */
2249 contains_placeholder_p (const_tree exp
)
2251 enum tree_code code
;
2256 code
= TREE_CODE (exp
);
2257 if (code
== PLACEHOLDER_EXPR
)
2260 switch (TREE_CODE_CLASS (code
))
2263 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
2264 position computations since they will be converted into a
2265 WITH_RECORD_EXPR involving the reference, which will assume
2266 here will be valid. */
2267 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0));
2269 case tcc_exceptional
:
2270 if (code
== TREE_LIST
)
2271 return (CONTAINS_PLACEHOLDER_P (TREE_VALUE (exp
))
2272 || CONTAINS_PLACEHOLDER_P (TREE_CHAIN (exp
)));
2277 case tcc_comparison
:
2278 case tcc_expression
:
2282 /* Ignoring the first operand isn't quite right, but works best. */
2283 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1));
2286 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0))
2287 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1))
2288 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 2)));
2294 switch (TREE_CODE_LENGTH (code
))
2297 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0));
2299 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0))
2300 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1)));
2311 const_call_expr_arg_iterator iter
;
2312 FOR_EACH_CONST_CALL_EXPR_ARG (arg
, iter
, exp
)
2313 if (CONTAINS_PLACEHOLDER_P (arg
))
2327 /* Return true if any part of the computation of TYPE involves a
2328 PLACEHOLDER_EXPR. This includes size, bounds, qualifiers
2329 (for QUAL_UNION_TYPE) and field positions. */
2332 type_contains_placeholder_1 (const_tree type
)
2334 /* If the size contains a placeholder or the parent type (component type in
2335 the case of arrays) type involves a placeholder, this type does. */
2336 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type
))
2337 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (type
))
2338 || (TREE_TYPE (type
) != 0
2339 && type_contains_placeholder_p (TREE_TYPE (type
))))
2342 /* Now do type-specific checks. Note that the last part of the check above
2343 greatly limits what we have to do below. */
2344 switch (TREE_CODE (type
))
2352 case REFERENCE_TYPE
:
2360 case FIXED_POINT_TYPE
:
2361 /* Here we just check the bounds. */
2362 return (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (type
))
2363 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (type
)));
2366 /* We're already checked the component type (TREE_TYPE), so just check
2368 return type_contains_placeholder_p (TYPE_DOMAIN (type
));
2372 case QUAL_UNION_TYPE
:
2376 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
2377 if (TREE_CODE (field
) == FIELD_DECL
2378 && (CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (field
))
2379 || (TREE_CODE (type
) == QUAL_UNION_TYPE
2380 && CONTAINS_PLACEHOLDER_P (DECL_QUALIFIER (field
)))
2381 || type_contains_placeholder_p (TREE_TYPE (field
))))
2393 type_contains_placeholder_p (tree type
)
2397 /* If the contains_placeholder_bits field has been initialized,
2398 then we know the answer. */
2399 if (TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) > 0)
2400 return TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) - 1;
2402 /* Indicate that we've seen this type node, and the answer is false.
2403 This is what we want to return if we run into recursion via fields. */
2404 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) = 1;
2406 /* Compute the real value. */
2407 result
= type_contains_placeholder_1 (type
);
2409 /* Store the real value. */
2410 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) = result
+ 1;
2415 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
2416 return a tree with all occurrences of references to F in a
2417 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
2418 contains only arithmetic expressions or a CALL_EXPR with a
2419 PLACEHOLDER_EXPR occurring only in its arglist. */
2422 substitute_in_expr (tree exp
, tree f
, tree r
)
2424 enum tree_code code
= TREE_CODE (exp
);
2425 tree op0
, op1
, op2
, op3
;
2429 /* We handle TREE_LIST and COMPONENT_REF separately. */
2430 if (code
== TREE_LIST
)
2432 op0
= SUBSTITUTE_IN_EXPR (TREE_CHAIN (exp
), f
, r
);
2433 op1
= SUBSTITUTE_IN_EXPR (TREE_VALUE (exp
), f
, r
);
2434 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
2437 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
2439 else if (code
== COMPONENT_REF
)
2441 /* If this expression is getting a value from a PLACEHOLDER_EXPR
2442 and it is the right field, replace it with R. */
2443 for (inner
= TREE_OPERAND (exp
, 0);
2444 REFERENCE_CLASS_P (inner
);
2445 inner
= TREE_OPERAND (inner
, 0))
2447 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
2448 && TREE_OPERAND (exp
, 1) == f
)
2451 /* If this expression hasn't been completed let, leave it alone. */
2452 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
&& TREE_TYPE (inner
) == 0)
2455 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2456 if (op0
== TREE_OPERAND (exp
, 0))
2459 new = fold_build3 (COMPONENT_REF
, TREE_TYPE (exp
),
2460 op0
, TREE_OPERAND (exp
, 1), NULL_TREE
);
2463 switch (TREE_CODE_CLASS (code
))
2466 case tcc_declaration
:
2469 case tcc_exceptional
:
2472 case tcc_comparison
:
2473 case tcc_expression
:
2475 switch (TREE_CODE_LENGTH (code
))
2481 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2482 if (op0
== TREE_OPERAND (exp
, 0))
2485 new = fold_build1 (code
, TREE_TYPE (exp
), op0
);
2489 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2490 op1
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 1), f
, r
);
2492 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
2495 new = fold_build2 (code
, TREE_TYPE (exp
), op0
, op1
);
2499 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2500 op1
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 1), f
, r
);
2501 op2
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 2), f
, r
);
2503 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2504 && op2
== TREE_OPERAND (exp
, 2))
2507 new = fold_build3 (code
, TREE_TYPE (exp
), op0
, op1
, op2
);
2511 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2512 op1
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 1), f
, r
);
2513 op2
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 2), f
, r
);
2514 op3
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 3), f
, r
);
2516 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2517 && op2
== TREE_OPERAND (exp
, 2)
2518 && op3
== TREE_OPERAND (exp
, 3))
2521 new = fold (build4 (code
, TREE_TYPE (exp
), op0
, op1
, op2
, op3
));
2531 tree copy
= NULL_TREE
;
2533 int n
= TREE_OPERAND_LENGTH (exp
);
2534 for (i
= 1; i
< n
; i
++)
2536 tree op
= TREE_OPERAND (exp
, i
);
2537 tree newop
= SUBSTITUTE_IN_EXPR (op
, f
, r
);
2540 copy
= copy_node (exp
);
2541 TREE_OPERAND (copy
, i
) = newop
;
2554 TREE_READONLY (new) = TREE_READONLY (exp
);
2558 /* Similar, but look for a PLACEHOLDER_EXPR in EXP and find a replacement
2559 for it within OBJ, a tree that is an object or a chain of references. */
2562 substitute_placeholder_in_expr (tree exp
, tree obj
)
2564 enum tree_code code
= TREE_CODE (exp
);
2565 tree op0
, op1
, op2
, op3
;
2567 /* If this is a PLACEHOLDER_EXPR, see if we find a corresponding type
2568 in the chain of OBJ. */
2569 if (code
== PLACEHOLDER_EXPR
)
2571 tree need_type
= TYPE_MAIN_VARIANT (TREE_TYPE (exp
));
2574 for (elt
= obj
; elt
!= 0;
2575 elt
= ((TREE_CODE (elt
) == COMPOUND_EXPR
2576 || TREE_CODE (elt
) == COND_EXPR
)
2577 ? TREE_OPERAND (elt
, 1)
2578 : (REFERENCE_CLASS_P (elt
)
2579 || UNARY_CLASS_P (elt
)
2580 || BINARY_CLASS_P (elt
)
2581 || VL_EXP_CLASS_P (elt
)
2582 || EXPRESSION_CLASS_P (elt
))
2583 ? TREE_OPERAND (elt
, 0) : 0))
2584 if (TYPE_MAIN_VARIANT (TREE_TYPE (elt
)) == need_type
)
2587 for (elt
= obj
; elt
!= 0;
2588 elt
= ((TREE_CODE (elt
) == COMPOUND_EXPR
2589 || TREE_CODE (elt
) == COND_EXPR
)
2590 ? TREE_OPERAND (elt
, 1)
2591 : (REFERENCE_CLASS_P (elt
)
2592 || UNARY_CLASS_P (elt
)
2593 || BINARY_CLASS_P (elt
)
2594 || VL_EXP_CLASS_P (elt
)
2595 || EXPRESSION_CLASS_P (elt
))
2596 ? TREE_OPERAND (elt
, 0) : 0))
2597 if (POINTER_TYPE_P (TREE_TYPE (elt
))
2598 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (elt
)))
2600 return fold_build1 (INDIRECT_REF
, need_type
, elt
);
2602 /* If we didn't find it, return the original PLACEHOLDER_EXPR. If it
2603 survives until RTL generation, there will be an error. */
2607 /* TREE_LIST is special because we need to look at TREE_VALUE
2608 and TREE_CHAIN, not TREE_OPERANDS. */
2609 else if (code
== TREE_LIST
)
2611 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp
), obj
);
2612 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp
), obj
);
2613 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
2616 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
2619 switch (TREE_CODE_CLASS (code
))
2622 case tcc_declaration
:
2625 case tcc_exceptional
:
2628 case tcc_comparison
:
2629 case tcc_expression
:
2632 switch (TREE_CODE_LENGTH (code
))
2638 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2639 if (op0
== TREE_OPERAND (exp
, 0))
2642 return fold_build1 (code
, TREE_TYPE (exp
), op0
);
2645 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2646 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2648 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
2651 return fold_build2 (code
, TREE_TYPE (exp
), op0
, op1
);
2654 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2655 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2656 op2
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 2), obj
);
2658 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2659 && op2
== TREE_OPERAND (exp
, 2))
2662 return fold_build3 (code
, TREE_TYPE (exp
), op0
, op1
, op2
);
2665 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2666 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2667 op2
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 2), obj
);
2668 op3
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 3), obj
);
2670 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2671 && op2
== TREE_OPERAND (exp
, 2)
2672 && op3
== TREE_OPERAND (exp
, 3))
2675 return fold (build4 (code
, TREE_TYPE (exp
), op0
, op1
, op2
, op3
));
2684 tree copy
= NULL_TREE
;
2686 int n
= TREE_OPERAND_LENGTH (exp
);
2687 for (i
= 1; i
< n
; i
++)
2689 tree op
= TREE_OPERAND (exp
, i
);
2690 tree newop
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (op
, obj
);
2694 copy
= copy_node (exp
);
2695 TREE_OPERAND (copy
, i
) = newop
;
2709 /* Stabilize a reference so that we can use it any number of times
2710 without causing its operands to be evaluated more than once.
2711 Returns the stabilized reference. This works by means of save_expr,
2712 so see the caveats in the comments about save_expr.
2714 Also allows conversion expressions whose operands are references.
2715 Any other kind of expression is returned unchanged. */
2718 stabilize_reference (tree ref
)
2721 enum tree_code code
= TREE_CODE (ref
);
2728 /* No action is needed in this case. */
2734 case FIX_TRUNC_EXPR
:
2735 result
= build_nt (code
, stabilize_reference (TREE_OPERAND (ref
, 0)));
2739 result
= build_nt (INDIRECT_REF
,
2740 stabilize_reference_1 (TREE_OPERAND (ref
, 0)));
2744 result
= build_nt (COMPONENT_REF
,
2745 stabilize_reference (TREE_OPERAND (ref
, 0)),
2746 TREE_OPERAND (ref
, 1), NULL_TREE
);
2750 result
= build_nt (BIT_FIELD_REF
,
2751 stabilize_reference (TREE_OPERAND (ref
, 0)),
2752 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2753 stabilize_reference_1 (TREE_OPERAND (ref
, 2)));
2757 result
= build_nt (ARRAY_REF
,
2758 stabilize_reference (TREE_OPERAND (ref
, 0)),
2759 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2760 TREE_OPERAND (ref
, 2), TREE_OPERAND (ref
, 3));
2763 case ARRAY_RANGE_REF
:
2764 result
= build_nt (ARRAY_RANGE_REF
,
2765 stabilize_reference (TREE_OPERAND (ref
, 0)),
2766 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2767 TREE_OPERAND (ref
, 2), TREE_OPERAND (ref
, 3));
2771 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2772 it wouldn't be ignored. This matters when dealing with
2774 return stabilize_reference_1 (ref
);
2776 /* If arg isn't a kind of lvalue we recognize, make no change.
2777 Caller should recognize the error for an invalid lvalue. */
2782 return error_mark_node
;
2785 TREE_TYPE (result
) = TREE_TYPE (ref
);
2786 TREE_READONLY (result
) = TREE_READONLY (ref
);
2787 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (ref
);
2788 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (ref
);
2793 /* Subroutine of stabilize_reference; this is called for subtrees of
2794 references. Any expression with side-effects must be put in a SAVE_EXPR
2795 to ensure that it is only evaluated once.
2797 We don't put SAVE_EXPR nodes around everything, because assigning very
2798 simple expressions to temporaries causes us to miss good opportunities
2799 for optimizations. Among other things, the opportunity to fold in the
2800 addition of a constant into an addressing mode often gets lost, e.g.
2801 "y[i+1] += x;". In general, we take the approach that we should not make
2802 an assignment unless we are forced into it - i.e., that any non-side effect
2803 operator should be allowed, and that cse should take care of coalescing
2804 multiple utterances of the same expression should that prove fruitful. */
2807 stabilize_reference_1 (tree e
)
2810 enum tree_code code
= TREE_CODE (e
);
2812 /* We cannot ignore const expressions because it might be a reference
2813 to a const array but whose index contains side-effects. But we can
2814 ignore things that are actual constant or that already have been
2815 handled by this function. */
2817 if (TREE_INVARIANT (e
))
2820 switch (TREE_CODE_CLASS (code
))
2822 case tcc_exceptional
:
2824 case tcc_declaration
:
2825 case tcc_comparison
:
2827 case tcc_expression
:
2830 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2831 so that it will only be evaluated once. */
2832 /* The reference (r) and comparison (<) classes could be handled as
2833 below, but it is generally faster to only evaluate them once. */
2834 if (TREE_SIDE_EFFECTS (e
))
2835 return save_expr (e
);
2839 /* Constants need no processing. In fact, we should never reach
2844 /* Division is slow and tends to be compiled with jumps,
2845 especially the division by powers of 2 that is often
2846 found inside of an array reference. So do it just once. */
2847 if (code
== TRUNC_DIV_EXPR
|| code
== TRUNC_MOD_EXPR
2848 || code
== FLOOR_DIV_EXPR
|| code
== FLOOR_MOD_EXPR
2849 || code
== CEIL_DIV_EXPR
|| code
== CEIL_MOD_EXPR
2850 || code
== ROUND_DIV_EXPR
|| code
== ROUND_MOD_EXPR
)
2851 return save_expr (e
);
2852 /* Recursively stabilize each operand. */
2853 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)),
2854 stabilize_reference_1 (TREE_OPERAND (e
, 1)));
2858 /* Recursively stabilize each operand. */
2859 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)));
2866 TREE_TYPE (result
) = TREE_TYPE (e
);
2867 TREE_READONLY (result
) = TREE_READONLY (e
);
2868 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (e
);
2869 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (e
);
2870 TREE_INVARIANT (result
) = 1;
2875 /* Low-level constructors for expressions. */
2877 /* A helper function for build1 and constant folders. Set TREE_CONSTANT,
2878 TREE_INVARIANT, and TREE_SIDE_EFFECTS for an ADDR_EXPR. */
2881 recompute_tree_invariant_for_addr_expr (tree t
)
2884 bool tc
= true, ti
= true, se
= false;
2886 /* We started out assuming this address is both invariant and constant, but
2887 does not have side effects. Now go down any handled components and see if
2888 any of them involve offsets that are either non-constant or non-invariant.
2889 Also check for side-effects.
2891 ??? Note that this code makes no attempt to deal with the case where
2892 taking the address of something causes a copy due to misalignment. */
2894 #define UPDATE_TITCSE(NODE) \
2895 do { tree _node = (NODE); \
2896 if (_node && !TREE_INVARIANT (_node)) ti = false; \
2897 if (_node && !TREE_CONSTANT (_node)) tc = false; \
2898 if (_node && TREE_SIDE_EFFECTS (_node)) se = true; } while (0)
2900 for (node
= TREE_OPERAND (t
, 0); handled_component_p (node
);
2901 node
= TREE_OPERAND (node
, 0))
2903 /* If the first operand doesn't have an ARRAY_TYPE, this is a bogus
2904 array reference (probably made temporarily by the G++ front end),
2905 so ignore all the operands. */
2906 if ((TREE_CODE (node
) == ARRAY_REF
2907 || TREE_CODE (node
) == ARRAY_RANGE_REF
)
2908 && TREE_CODE (TREE_TYPE (TREE_OPERAND (node
, 0))) == ARRAY_TYPE
)
2910 UPDATE_TITCSE (TREE_OPERAND (node
, 1));
2911 if (TREE_OPERAND (node
, 2))
2912 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2913 if (TREE_OPERAND (node
, 3))
2914 UPDATE_TITCSE (TREE_OPERAND (node
, 3));
2916 /* Likewise, just because this is a COMPONENT_REF doesn't mean we have a
2917 FIELD_DECL, apparently. The G++ front end can put something else
2918 there, at least temporarily. */
2919 else if (TREE_CODE (node
) == COMPONENT_REF
2920 && TREE_CODE (TREE_OPERAND (node
, 1)) == FIELD_DECL
)
2922 if (TREE_OPERAND (node
, 2))
2923 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2925 else if (TREE_CODE (node
) == BIT_FIELD_REF
)
2926 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2929 node
= lang_hooks
.expr_to_decl (node
, &tc
, &ti
, &se
);
2931 /* Now see what's inside. If it's an INDIRECT_REF, copy our properties from
2932 the address, since &(*a)->b is a form of addition. If it's a decl, it's
2933 invariant and constant if the decl is static. It's also invariant if it's
2934 a decl in the current function. Taking the address of a volatile variable
2935 is not volatile. If it's a constant, the address is both invariant and
2936 constant. Otherwise it's neither. */
2937 if (TREE_CODE (node
) == INDIRECT_REF
)
2938 UPDATE_TITCSE (TREE_OPERAND (node
, 0));
2939 else if (DECL_P (node
))
2943 else if (decl_function_context (node
) == current_function_decl
2944 /* Addresses of thread-local variables are invariant. */
2945 || (TREE_CODE (node
) == VAR_DECL
2946 && DECL_THREAD_LOCAL_P (node
)))
2951 else if (CONSTANT_CLASS_P (node
))
2956 se
|= TREE_SIDE_EFFECTS (node
);
2959 TREE_CONSTANT (t
) = tc
;
2960 TREE_INVARIANT (t
) = ti
;
2961 TREE_SIDE_EFFECTS (t
) = se
;
2962 #undef UPDATE_TITCSE
2965 /* Build an expression of code CODE, data type TYPE, and operands as
2966 specified. Expressions and reference nodes can be created this way.
2967 Constants, decls, types and misc nodes cannot be.
2969 We define 5 non-variadic functions, from 0 to 4 arguments. This is
2970 enough for all extant tree codes. */
2973 build0_stat (enum tree_code code
, tree tt MEM_STAT_DECL
)
2977 gcc_assert (TREE_CODE_LENGTH (code
) == 0);
2979 t
= make_node_stat (code PASS_MEM_STAT
);
2986 build1_stat (enum tree_code code
, tree type
, tree node MEM_STAT_DECL
)
2988 int length
= sizeof (struct tree_exp
);
2989 #ifdef GATHER_STATISTICS
2990 tree_node_kind kind
;
2994 #ifdef GATHER_STATISTICS
2995 switch (TREE_CODE_CLASS (code
))
2997 case tcc_statement
: /* an expression with side effects */
3000 case tcc_reference
: /* a reference */
3008 tree_node_counts
[(int) kind
]++;
3009 tree_node_sizes
[(int) kind
] += length
;
3012 gcc_assert (TREE_CODE_LENGTH (code
) == 1);
3014 t
= ggc_alloc_zone_pass_stat (length
, &tree_zone
);
3016 memset (t
, 0, sizeof (struct tree_common
));
3018 TREE_SET_CODE (t
, code
);
3020 TREE_TYPE (t
) = type
;
3021 #ifdef USE_MAPPED_LOCATION
3022 SET_EXPR_LOCATION (t
, UNKNOWN_LOCATION
);
3024 SET_EXPR_LOCUS (t
, NULL
);
3026 TREE_OPERAND (t
, 0) = node
;
3027 TREE_BLOCK (t
) = NULL_TREE
;
3028 if (node
&& !TYPE_P (node
))
3030 TREE_SIDE_EFFECTS (t
) = TREE_SIDE_EFFECTS (node
);
3031 TREE_READONLY (t
) = TREE_READONLY (node
);
3034 if (TREE_CODE_CLASS (code
) == tcc_statement
)
3035 TREE_SIDE_EFFECTS (t
) = 1;
3039 /* All of these have side-effects, no matter what their
3041 TREE_SIDE_EFFECTS (t
) = 1;
3042 TREE_READONLY (t
) = 0;
3045 case MISALIGNED_INDIRECT_REF
:
3046 case ALIGN_INDIRECT_REF
:
3048 /* Whether a dereference is readonly has nothing to do with whether
3049 its operand is readonly. */
3050 TREE_READONLY (t
) = 0;
3055 recompute_tree_invariant_for_addr_expr (t
);
3059 if ((TREE_CODE_CLASS (code
) == tcc_unary
|| code
== VIEW_CONVERT_EXPR
)
3060 && node
&& !TYPE_P (node
)
3061 && TREE_CONSTANT (node
))
3062 TREE_CONSTANT (t
) = 1;
3063 if ((TREE_CODE_CLASS (code
) == tcc_unary
|| code
== VIEW_CONVERT_EXPR
)
3064 && node
&& TREE_INVARIANT (node
))
3065 TREE_INVARIANT (t
) = 1;
3066 if (TREE_CODE_CLASS (code
) == tcc_reference
3067 && node
&& TREE_THIS_VOLATILE (node
))
3068 TREE_THIS_VOLATILE (t
) = 1;
3075 #define PROCESS_ARG(N) \
3077 TREE_OPERAND (t, N) = arg##N; \
3078 if (arg##N &&!TYPE_P (arg##N)) \
3080 if (TREE_SIDE_EFFECTS (arg##N)) \
3082 if (!TREE_READONLY (arg##N)) \
3084 if (!TREE_CONSTANT (arg##N)) \
3086 if (!TREE_INVARIANT (arg##N)) \
3092 build2_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1 MEM_STAT_DECL
)
3094 bool constant
, read_only
, side_effects
, invariant
;
3097 gcc_assert (TREE_CODE_LENGTH (code
) == 2);
3100 /* FIXME tuples: Statement's aren't expressions! */
3101 if (code
== GIMPLE_MODIFY_STMT
)
3102 return build_gimple_modify_stmt_stat (arg0
, arg1 PASS_MEM_STAT
);
3104 /* Must use build_gimple_modify_stmt to construct GIMPLE_MODIFY_STMTs. */
3105 gcc_assert (code
!= GIMPLE_MODIFY_STMT
);
3108 if ((code
== MINUS_EXPR
|| code
== PLUS_EXPR
|| code
== MULT_EXPR
)
3109 && arg0
&& arg1
&& tt
&& POINTER_TYPE_P (tt
))
3110 gcc_assert (TREE_CODE (arg0
) == INTEGER_CST
&& TREE_CODE (arg1
) == INTEGER_CST
);
3112 if (code
== POINTER_PLUS_EXPR
&& arg0
&& arg1
&& tt
)
3113 gcc_assert (POINTER_TYPE_P (tt
) && POINTER_TYPE_P (TREE_TYPE (arg0
))
3114 && INTEGRAL_TYPE_P (TREE_TYPE (arg1
))
3115 && useless_type_conversion_p (sizetype
, TREE_TYPE (arg1
)));
3117 t
= make_node_stat (code PASS_MEM_STAT
);
3120 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
3121 result based on those same flags for the arguments. But if the
3122 arguments aren't really even `tree' expressions, we shouldn't be trying
3125 /* Expressions without side effects may be constant if their
3126 arguments are as well. */
3127 constant
= (TREE_CODE_CLASS (code
) == tcc_comparison
3128 || TREE_CODE_CLASS (code
) == tcc_binary
);
3130 side_effects
= TREE_SIDE_EFFECTS (t
);
3131 invariant
= constant
;
3136 TREE_READONLY (t
) = read_only
;
3137 TREE_CONSTANT (t
) = constant
;
3138 TREE_INVARIANT (t
) = invariant
;
3139 TREE_SIDE_EFFECTS (t
) = side_effects
;
3140 TREE_THIS_VOLATILE (t
)
3141 = (TREE_CODE_CLASS (code
) == tcc_reference
3142 && arg0
&& TREE_THIS_VOLATILE (arg0
));
3148 /* Build a GIMPLE_MODIFY_STMT node. This tree code doesn't have a
3149 type, so we can't use build2 (a.k.a. build2_stat). */
3152 build_gimple_modify_stmt_stat (tree arg0
, tree arg1 MEM_STAT_DECL
)
3156 t
= make_node_stat (GIMPLE_MODIFY_STMT PASS_MEM_STAT
);
3157 /* ?? We don't care about setting flags for tuples... */
3158 GIMPLE_STMT_OPERAND (t
, 0) = arg0
;
3159 GIMPLE_STMT_OPERAND (t
, 1) = arg1
;
3164 build3_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
3165 tree arg2 MEM_STAT_DECL
)
3167 bool constant
, read_only
, side_effects
, invariant
;
3170 gcc_assert (TREE_CODE_LENGTH (code
) == 3);
3171 gcc_assert (TREE_CODE_CLASS (code
) != tcc_vl_exp
);
3173 t
= make_node_stat (code PASS_MEM_STAT
);
3176 /* As a special exception, if COND_EXPR has NULL branches, we
3177 assume that it is a gimple statement and always consider
3178 it to have side effects. */
3179 if (code
== COND_EXPR
3180 && tt
== void_type_node
3181 && arg1
== NULL_TREE
3182 && arg2
== NULL_TREE
)
3183 side_effects
= true;
3185 side_effects
= TREE_SIDE_EFFECTS (t
);
3191 TREE_SIDE_EFFECTS (t
) = side_effects
;
3192 TREE_THIS_VOLATILE (t
)
3193 = (TREE_CODE_CLASS (code
) == tcc_reference
3194 && arg0
&& TREE_THIS_VOLATILE (arg0
));
3200 build4_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
3201 tree arg2
, tree arg3 MEM_STAT_DECL
)
3203 bool constant
, read_only
, side_effects
, invariant
;
3206 gcc_assert (TREE_CODE_LENGTH (code
) == 4);
3208 t
= make_node_stat (code PASS_MEM_STAT
);
3211 side_effects
= TREE_SIDE_EFFECTS (t
);
3218 TREE_SIDE_EFFECTS (t
) = side_effects
;
3219 TREE_THIS_VOLATILE (t
)
3220 = (TREE_CODE_CLASS (code
) == tcc_reference
3221 && arg0
&& TREE_THIS_VOLATILE (arg0
));
3227 build5_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
3228 tree arg2
, tree arg3
, tree arg4 MEM_STAT_DECL
)
3230 bool constant
, read_only
, side_effects
, invariant
;
3233 gcc_assert (TREE_CODE_LENGTH (code
) == 5);
3235 t
= make_node_stat (code PASS_MEM_STAT
);
3238 side_effects
= TREE_SIDE_EFFECTS (t
);
3246 TREE_SIDE_EFFECTS (t
) = side_effects
;
3247 TREE_THIS_VOLATILE (t
)
3248 = (TREE_CODE_CLASS (code
) == tcc_reference
3249 && arg0
&& TREE_THIS_VOLATILE (arg0
));
3255 build7_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
3256 tree arg2
, tree arg3
, tree arg4
, tree arg5
,
3257 tree arg6 MEM_STAT_DECL
)
3259 bool constant
, read_only
, side_effects
, invariant
;
3262 gcc_assert (code
== TARGET_MEM_REF
);
3264 t
= make_node_stat (code PASS_MEM_STAT
);
3267 side_effects
= TREE_SIDE_EFFECTS (t
);
3277 TREE_SIDE_EFFECTS (t
) = side_effects
;
3278 TREE_THIS_VOLATILE (t
) = 0;
3283 /* Similar except don't specify the TREE_TYPE
3284 and leave the TREE_SIDE_EFFECTS as 0.
3285 It is permissible for arguments to be null,
3286 or even garbage if their values do not matter. */
3289 build_nt (enum tree_code code
, ...)
3296 gcc_assert (TREE_CODE_CLASS (code
) != tcc_vl_exp
);
3300 t
= make_node (code
);
3301 length
= TREE_CODE_LENGTH (code
);
3303 for (i
= 0; i
< length
; i
++)
3304 TREE_OPERAND (t
, i
) = va_arg (p
, tree
);
3310 /* Similar to build_nt, but for creating a CALL_EXPR object with
3311 ARGLIST passed as a list. */
3314 build_nt_call_list (tree fn
, tree arglist
)
3319 t
= build_vl_exp (CALL_EXPR
, list_length (arglist
) + 3);
3320 CALL_EXPR_FN (t
) = fn
;
3321 CALL_EXPR_STATIC_CHAIN (t
) = NULL_TREE
;
3322 for (i
= 0; arglist
; arglist
= TREE_CHAIN (arglist
), i
++)
3323 CALL_EXPR_ARG (t
, i
) = TREE_VALUE (arglist
);
3327 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
3328 We do NOT enter this node in any sort of symbol table.
3330 layout_decl is used to set up the decl's storage layout.
3331 Other slots are initialized to 0 or null pointers. */
3334 build_decl_stat (enum tree_code code
, tree name
, tree type MEM_STAT_DECL
)
3338 t
= make_node_stat (code PASS_MEM_STAT
);
3340 /* if (type == error_mark_node)
3341 type = integer_type_node; */
3342 /* That is not done, deliberately, so that having error_mark_node
3343 as the type can suppress useless errors in the use of this variable. */
3345 DECL_NAME (t
) = name
;
3346 TREE_TYPE (t
) = type
;
3348 if (code
== VAR_DECL
|| code
== PARM_DECL
|| code
== RESULT_DECL
)
3354 /* Builds and returns function declaration with NAME and TYPE. */
3357 build_fn_decl (const char *name
, tree type
)
3359 tree id
= get_identifier (name
);
3360 tree decl
= build_decl (FUNCTION_DECL
, id
, type
);
3362 DECL_EXTERNAL (decl
) = 1;
3363 TREE_PUBLIC (decl
) = 1;
3364 DECL_ARTIFICIAL (decl
) = 1;
3365 TREE_NOTHROW (decl
) = 1;
3371 /* BLOCK nodes are used to represent the structure of binding contours
3372 and declarations, once those contours have been exited and their contents
3373 compiled. This information is used for outputting debugging info. */
3376 build_block (tree vars
, tree subblocks
, tree supercontext
, tree chain
)
3378 tree block
= make_node (BLOCK
);
3380 BLOCK_VARS (block
) = vars
;
3381 BLOCK_SUBBLOCKS (block
) = subblocks
;
3382 BLOCK_SUPERCONTEXT (block
) = supercontext
;
3383 BLOCK_CHAIN (block
) = chain
;
3387 #if 1 /* ! defined(USE_MAPPED_LOCATION) */
3388 /* ??? gengtype doesn't handle conditionals */
3389 static GTY(()) source_locus last_annotated_node
;
3392 #ifdef USE_MAPPED_LOCATION
3395 expand_location (source_location loc
)
3397 expanded_location xloc
;
3406 const struct line_map
*map
= linemap_lookup (&line_table
, loc
);
3407 xloc
.file
= map
->to_file
;
3408 xloc
.line
= SOURCE_LINE (map
, loc
);
3409 xloc
.column
= SOURCE_COLUMN (map
, loc
);
3416 /* Record the exact location where an expression or an identifier were
3420 annotate_with_file_line (tree node
, const char *file
, int line
)
3422 /* Roughly one percent of the calls to this function are to annotate
3423 a node with the same information already attached to that node!
3424 Just return instead of wasting memory. */
3425 if (EXPR_LOCUS (node
)
3426 && EXPR_LINENO (node
) == line
3427 && (EXPR_FILENAME (node
) == file
3428 || !strcmp (EXPR_FILENAME (node
), file
)))
3430 last_annotated_node
= EXPR_LOCUS (node
);
3434 /* In heavily macroized code (such as GCC itself) this single
3435 entry cache can reduce the number of allocations by more
3437 if (last_annotated_node
3438 && last_annotated_node
->line
== line
3439 && (last_annotated_node
->file
== file
3440 || !strcmp (last_annotated_node
->file
, file
)))
3442 SET_EXPR_LOCUS (node
, last_annotated_node
);
3446 SET_EXPR_LOCUS (node
, ggc_alloc (sizeof (location_t
)));
3447 EXPR_LINENO (node
) = line
;
3448 EXPR_FILENAME (node
) = file
;
3449 last_annotated_node
= EXPR_LOCUS (node
);
3453 annotate_with_locus (tree node
, location_t locus
)
3455 annotate_with_file_line (node
, locus
.file
, locus
.line
);
3459 /* Source location accessor functions. */
3462 /* The source location of this expression. Non-tree_exp nodes such as
3463 decls and constants can be shared among multiple locations, so
3466 expr_location (const_tree node
)
3468 #ifdef USE_MAPPED_LOCATION
3469 if (GIMPLE_STMT_P (node
))
3470 return GIMPLE_STMT_LOCUS (node
);
3471 return EXPR_P (node
) ? node
->exp
.locus
: UNKNOWN_LOCATION
;
3473 if (GIMPLE_STMT_P (node
))
3474 return EXPR_HAS_LOCATION (node
)
3475 ? *GIMPLE_STMT_LOCUS (node
) : UNKNOWN_LOCATION
;
3476 return EXPR_HAS_LOCATION (node
) ? *node
->exp
.locus
: UNKNOWN_LOCATION
;
3481 set_expr_location (tree node
, location_t locus
)
3483 #ifdef USE_MAPPED_LOCATION
3484 if (GIMPLE_STMT_P (node
))
3485 GIMPLE_STMT_LOCUS (node
) = locus
;
3487 EXPR_CHECK (node
)->exp
.locus
= locus
;
3489 annotate_with_locus (node
, locus
);
3494 expr_has_location (const_tree node
)
3496 #ifdef USE_MAPPED_LOCATION
3497 return expr_location (node
) != UNKNOWN_LOCATION
;
3499 return expr_locus (node
) != NULL
;
3503 #ifdef USE_MAPPED_LOCATION
3508 expr_locus (const_tree node
)
3510 #ifdef USE_MAPPED_LOCATION
3511 if (GIMPLE_STMT_P (node
))
3512 return &GIMPLE_STMT_LOCUS (node
);
3513 return EXPR_P (node
) ? &node
->exp
.locus
: (location_t
*) NULL
;
3515 if (GIMPLE_STMT_P (node
))
3516 return GIMPLE_STMT_LOCUS (node
);
3517 /* ?? The cast below was originally "(location_t *)" in the macro,
3518 but that makes no sense. ?? */
3519 return EXPR_P (node
) ? node
->exp
.locus
: (source_locus
) NULL
;
3524 set_expr_locus (tree node
,
3525 #ifdef USE_MAPPED_LOCATION
3526 source_location
*loc
3532 #ifdef USE_MAPPED_LOCATION
3535 if (GIMPLE_STMT_P (node
))
3536 GIMPLE_STMT_LOCUS (node
) = UNKNOWN_LOCATION
;
3538 EXPR_CHECK (node
)->exp
.locus
= UNKNOWN_LOCATION
;
3542 if (GIMPLE_STMT_P (node
))
3543 GIMPLE_STMT_LOCUS (node
) = *loc
;
3545 EXPR_CHECK (node
)->exp
.locus
= *loc
;
3548 if (GIMPLE_STMT_P (node
))
3549 GIMPLE_STMT_LOCUS (node
) = loc
;
3551 EXPR_CHECK (node
)->exp
.locus
= loc
;
3556 expr_filename (const_tree node
)
3558 #ifdef USE_MAPPED_LOCATION
3559 if (GIMPLE_STMT_P (node
))
3560 return &LOCATION_FILE (GIMPLE_STMT_LOCUS (node
));
3561 return &LOCATION_FILE (EXPR_CHECK (node
)->exp
.locus
);
3563 if (GIMPLE_STMT_P (node
))
3564 return &GIMPLE_STMT_LOCUS (node
)->file
;
3565 return &(EXPR_CHECK (node
)->exp
.locus
->file
);
3570 expr_lineno (const_tree node
)
3572 #ifdef USE_MAPPED_LOCATION
3573 if (GIMPLE_STMT_P (node
))
3574 return &LOCATION_LINE (GIMPLE_STMT_LOCUS (node
));
3575 return &LOCATION_LINE (EXPR_CHECK (node
)->exp
.locus
);
3577 if (GIMPLE_STMT_P (node
))
3578 return &GIMPLE_STMT_LOCUS (node
)->line
;
3579 return &EXPR_CHECK (node
)->exp
.locus
->line
;
3583 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
3587 build_decl_attribute_variant (tree ddecl
, tree attribute
)
3589 DECL_ATTRIBUTES (ddecl
) = attribute
;
3593 /* Borrowed from hashtab.c iterative_hash implementation. */
3594 #define mix(a,b,c) \
3596 a -= b; a -= c; a ^= (c>>13); \
3597 b -= c; b -= a; b ^= (a<< 8); \
3598 c -= a; c -= b; c ^= ((b&0xffffffff)>>13); \
3599 a -= b; a -= c; a ^= ((c&0xffffffff)>>12); \
3600 b -= c; b -= a; b = (b ^ (a<<16)) & 0xffffffff; \
3601 c -= a; c -= b; c = (c ^ (b>> 5)) & 0xffffffff; \
3602 a -= b; a -= c; a = (a ^ (c>> 3)) & 0xffffffff; \
3603 b -= c; b -= a; b = (b ^ (a<<10)) & 0xffffffff; \
3604 c -= a; c -= b; c = (c ^ (b>>15)) & 0xffffffff; \
3608 /* Produce good hash value combining VAL and VAL2. */
3609 static inline hashval_t
3610 iterative_hash_hashval_t (hashval_t val
, hashval_t val2
)
3612 /* the golden ratio; an arbitrary value. */
3613 hashval_t a
= 0x9e3779b9;
3619 /* Produce good hash value combining PTR and VAL2. */
3620 static inline hashval_t
3621 iterative_hash_pointer (const void *ptr
, hashval_t val2
)
3623 if (sizeof (ptr
) == sizeof (hashval_t
))
3624 return iterative_hash_hashval_t ((size_t) ptr
, val2
);
3627 hashval_t a
= (hashval_t
) (size_t) ptr
;
3628 /* Avoid warnings about shifting of more than the width of the type on
3629 hosts that won't execute this path. */
3631 hashval_t b
= (hashval_t
) ((size_t) ptr
>> (sizeof (hashval_t
) * 8 + zero
));
3637 /* Produce good hash value combining VAL and VAL2. */
3638 static inline hashval_t
3639 iterative_hash_host_wide_int (HOST_WIDE_INT val
, hashval_t val2
)
3641 if (sizeof (HOST_WIDE_INT
) == sizeof (hashval_t
))
3642 return iterative_hash_hashval_t (val
, val2
);
3645 hashval_t a
= (hashval_t
) val
;
3646 /* Avoid warnings about shifting of more than the width of the type on
3647 hosts that won't execute this path. */
3649 hashval_t b
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 8 + zero
));
3651 if (sizeof (HOST_WIDE_INT
) > 2 * sizeof (hashval_t
))
3653 hashval_t a
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 16 + zero
));
3654 hashval_t b
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 24 + zero
));
3661 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
3662 is ATTRIBUTE and its qualifiers are QUALS.
3664 Record such modified types already made so we don't make duplicates. */
3667 build_type_attribute_qual_variant (tree ttype
, tree attribute
, int quals
)
3669 if (! attribute_list_equal (TYPE_ATTRIBUTES (ttype
), attribute
))
3671 hashval_t hashcode
= 0;
3673 enum tree_code code
= TREE_CODE (ttype
);
3675 ntype
= copy_node (ttype
);
3677 TYPE_POINTER_TO (ntype
) = 0;
3678 TYPE_REFERENCE_TO (ntype
) = 0;
3679 TYPE_ATTRIBUTES (ntype
) = attribute
;
3681 if (TYPE_STRUCTURAL_EQUALITY_P (ttype
))
3682 SET_TYPE_STRUCTURAL_EQUALITY (ntype
);
3684 TYPE_CANONICAL (ntype
)
3685 = build_qualified_type (TYPE_CANONICAL (ttype
), quals
);
3687 /* Create a new main variant of TYPE. */
3688 TYPE_MAIN_VARIANT (ntype
) = ntype
;
3689 TYPE_NEXT_VARIANT (ntype
) = 0;
3690 set_type_quals (ntype
, TYPE_UNQUALIFIED
);
3692 hashcode
= iterative_hash_object (code
, hashcode
);
3693 if (TREE_TYPE (ntype
))
3694 hashcode
= iterative_hash_object (TYPE_HASH (TREE_TYPE (ntype
)),
3696 hashcode
= attribute_hash_list (attribute
, hashcode
);
3698 switch (TREE_CODE (ntype
))
3701 hashcode
= type_hash_list (TYPE_ARG_TYPES (ntype
), hashcode
);
3704 hashcode
= iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (ntype
)),
3708 hashcode
= iterative_hash_object
3709 (TREE_INT_CST_LOW (TYPE_MAX_VALUE (ntype
)), hashcode
);
3710 hashcode
= iterative_hash_object
3711 (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (ntype
)), hashcode
);
3714 case FIXED_POINT_TYPE
:
3716 unsigned int precision
= TYPE_PRECISION (ntype
);
3717 hashcode
= iterative_hash_object (precision
, hashcode
);
3724 ntype
= type_hash_canon (hashcode
, ntype
);
3726 /* If the target-dependent attributes make NTYPE different from
3727 its canonical type, we will need to use structural equality
3728 checks for this qualified type. */
3729 if (!targetm
.comp_type_attributes (ntype
, ttype
))
3730 SET_TYPE_STRUCTURAL_EQUALITY (ntype
);
3732 ttype
= build_qualified_type (ntype
, quals
);
3739 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
3742 Record such modified types already made so we don't make duplicates. */
3745 build_type_attribute_variant (tree ttype
, tree attribute
)
3747 return build_type_attribute_qual_variant (ttype
, attribute
,
3748 TYPE_QUALS (ttype
));
3751 /* Return nonzero if IDENT is a valid name for attribute ATTR,
3754 We try both `text' and `__text__', ATTR may be either one. */
3755 /* ??? It might be a reasonable simplification to require ATTR to be only
3756 `text'. One might then also require attribute lists to be stored in
3757 their canonicalized form. */
3760 is_attribute_with_length_p (const char *attr
, int attr_len
, const_tree ident
)
3765 if (TREE_CODE (ident
) != IDENTIFIER_NODE
)
3768 p
= IDENTIFIER_POINTER (ident
);
3769 ident_len
= IDENTIFIER_LENGTH (ident
);
3771 if (ident_len
== attr_len
3772 && strcmp (attr
, p
) == 0)
3775 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
3778 gcc_assert (attr
[1] == '_');
3779 gcc_assert (attr
[attr_len
- 2] == '_');
3780 gcc_assert (attr
[attr_len
- 1] == '_');
3781 if (ident_len
== attr_len
- 4
3782 && strncmp (attr
+ 2, p
, attr_len
- 4) == 0)
3787 if (ident_len
== attr_len
+ 4
3788 && p
[0] == '_' && p
[1] == '_'
3789 && p
[ident_len
- 2] == '_' && p
[ident_len
- 1] == '_'
3790 && strncmp (attr
, p
+ 2, attr_len
) == 0)
3797 /* Return nonzero if IDENT is a valid name for attribute ATTR,
3800 We try both `text' and `__text__', ATTR may be either one. */
3803 is_attribute_p (const char *attr
, const_tree ident
)
3805 return is_attribute_with_length_p (attr
, strlen (attr
), ident
);
3808 /* Given an attribute name and a list of attributes, return a pointer to the
3809 attribute's list element if the attribute is part of the list, or NULL_TREE
3810 if not found. If the attribute appears more than once, this only
3811 returns the first occurrence; the TREE_CHAIN of the return value should
3812 be passed back in if further occurrences are wanted. */
3815 lookup_attribute (const char *attr_name
, tree list
)
3818 size_t attr_len
= strlen (attr_name
);
3820 for (l
= list
; l
; l
= TREE_CHAIN (l
))
3822 gcc_assert (TREE_CODE (TREE_PURPOSE (l
)) == IDENTIFIER_NODE
);
3823 if (is_attribute_with_length_p (attr_name
, attr_len
, TREE_PURPOSE (l
)))
3830 /* Remove any instances of attribute ATTR_NAME in LIST and return the
3834 remove_attribute (const char *attr_name
, tree list
)
3837 size_t attr_len
= strlen (attr_name
);
3839 for (p
= &list
; *p
; )
3842 gcc_assert (TREE_CODE (TREE_PURPOSE (l
)) == IDENTIFIER_NODE
);
3843 if (is_attribute_with_length_p (attr_name
, attr_len
, TREE_PURPOSE (l
)))
3844 *p
= TREE_CHAIN (l
);
3846 p
= &TREE_CHAIN (l
);
3852 /* Return an attribute list that is the union of a1 and a2. */
3855 merge_attributes (tree a1
, tree a2
)
3859 /* Either one unset? Take the set one. */
3861 if ((attributes
= a1
) == 0)
3864 /* One that completely contains the other? Take it. */
3866 else if (a2
!= 0 && ! attribute_list_contained (a1
, a2
))
3868 if (attribute_list_contained (a2
, a1
))
3872 /* Pick the longest list, and hang on the other list. */
3874 if (list_length (a1
) < list_length (a2
))
3875 attributes
= a2
, a2
= a1
;
3877 for (; a2
!= 0; a2
= TREE_CHAIN (a2
))
3880 for (a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
3883 a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
3886 if (TREE_VALUE (a
) != NULL
3887 && TREE_CODE (TREE_VALUE (a
)) == TREE_LIST
3888 && TREE_VALUE (a2
) != NULL
3889 && TREE_CODE (TREE_VALUE (a2
)) == TREE_LIST
)
3891 if (simple_cst_list_equal (TREE_VALUE (a
),
3892 TREE_VALUE (a2
)) == 1)
3895 else if (simple_cst_equal (TREE_VALUE (a
),
3896 TREE_VALUE (a2
)) == 1)
3901 a1
= copy_node (a2
);
3902 TREE_CHAIN (a1
) = attributes
;
3911 /* Given types T1 and T2, merge their attributes and return
3915 merge_type_attributes (tree t1
, tree t2
)
3917 return merge_attributes (TYPE_ATTRIBUTES (t1
),
3918 TYPE_ATTRIBUTES (t2
));
3921 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
3925 merge_decl_attributes (tree olddecl
, tree newdecl
)
3927 return merge_attributes (DECL_ATTRIBUTES (olddecl
),
3928 DECL_ATTRIBUTES (newdecl
));
3931 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
3933 /* Specialization of merge_decl_attributes for various Windows targets.
3935 This handles the following situation:
3937 __declspec (dllimport) int foo;
3940 The second instance of `foo' nullifies the dllimport. */
3943 merge_dllimport_decl_attributes (tree old
, tree
new)
3946 int delete_dllimport_p
= 1;
3948 /* What we need to do here is remove from `old' dllimport if it doesn't
3949 appear in `new'. dllimport behaves like extern: if a declaration is
3950 marked dllimport and a definition appears later, then the object
3951 is not dllimport'd. We also remove a `new' dllimport if the old list
3952 contains dllexport: dllexport always overrides dllimport, regardless
3953 of the order of declaration. */
3954 if (!VAR_OR_FUNCTION_DECL_P (new))
3955 delete_dllimport_p
= 0;
3956 else if (DECL_DLLIMPORT_P (new)
3957 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (old
)))
3959 DECL_DLLIMPORT_P (new) = 0;
3960 warning (OPT_Wattributes
, "%q+D already declared with dllexport attribute: "
3961 "dllimport ignored", new);
3963 else if (DECL_DLLIMPORT_P (old
) && !DECL_DLLIMPORT_P (new))
3965 /* Warn about overriding a symbol that has already been used. eg:
3966 extern int __attribute__ ((dllimport)) foo;
3967 int* bar () {return &foo;}
3970 if (TREE_USED (old
))
3972 warning (0, "%q+D redeclared without dllimport attribute "
3973 "after being referenced with dll linkage", new);
3974 /* If we have used a variable's address with dllimport linkage,
3975 keep the old DECL_DLLIMPORT_P flag: the ADDR_EXPR using the
3976 decl may already have had TREE_INVARIANT and TREE_CONSTANT
3978 We still remove the attribute so that assembler code refers
3979 to '&foo rather than '_imp__foo'. */
3980 if (TREE_CODE (old
) == VAR_DECL
&& TREE_ADDRESSABLE (old
))
3981 DECL_DLLIMPORT_P (new) = 1;
3984 /* Let an inline definition silently override the external reference,
3985 but otherwise warn about attribute inconsistency. */
3986 else if (TREE_CODE (new) == VAR_DECL
3987 || !DECL_DECLARED_INLINE_P (new))
3988 warning (OPT_Wattributes
, "%q+D redeclared without dllimport attribute: "
3989 "previous dllimport ignored", new);
3992 delete_dllimport_p
= 0;
3994 a
= merge_attributes (DECL_ATTRIBUTES (old
), DECL_ATTRIBUTES (new));
3996 if (delete_dllimport_p
)
3999 const size_t attr_len
= strlen ("dllimport");
4001 /* Scan the list for dllimport and delete it. */
4002 for (prev
= NULL_TREE
, t
= a
; t
; prev
= t
, t
= TREE_CHAIN (t
))
4004 if (is_attribute_with_length_p ("dllimport", attr_len
,
4007 if (prev
== NULL_TREE
)
4010 TREE_CHAIN (prev
) = TREE_CHAIN (t
);
4019 /* Handle a "dllimport" or "dllexport" attribute; arguments as in
4020 struct attribute_spec.handler. */
4023 handle_dll_attribute (tree
* pnode
, tree name
, tree args
, int flags
,
4028 /* These attributes may apply to structure and union types being created,
4029 but otherwise should pass to the declaration involved. */
4032 if (flags
& ((int) ATTR_FLAG_DECL_NEXT
| (int) ATTR_FLAG_FUNCTION_NEXT
4033 | (int) ATTR_FLAG_ARRAY_NEXT
))
4035 *no_add_attrs
= true;
4036 return tree_cons (name
, args
, NULL_TREE
);
4038 if (TREE_CODE (node
) == RECORD_TYPE
4039 || TREE_CODE (node
) == UNION_TYPE
)
4041 node
= TYPE_NAME (node
);
4047 warning (OPT_Wattributes
, "%qs attribute ignored",
4048 IDENTIFIER_POINTER (name
));
4049 *no_add_attrs
= true;
4054 if (TREE_CODE (node
) != FUNCTION_DECL
4055 && TREE_CODE (node
) != VAR_DECL
4056 && TREE_CODE (node
) != TYPE_DECL
)
4058 *no_add_attrs
= true;
4059 warning (OPT_Wattributes
, "%qs attribute ignored",
4060 IDENTIFIER_POINTER (name
));
4064 /* Report error on dllimport ambiguities seen now before they cause
4066 else if (is_attribute_p ("dllimport", name
))
4068 /* Honor any target-specific overrides. */
4069 if (!targetm
.valid_dllimport_attribute_p (node
))
4070 *no_add_attrs
= true;
4072 else if (TREE_CODE (node
) == FUNCTION_DECL
4073 && DECL_DECLARED_INLINE_P (node
))
4075 warning (OPT_Wattributes
, "inline function %q+D declared as "
4076 " dllimport: attribute ignored", node
);
4077 *no_add_attrs
= true;
4079 /* Like MS, treat definition of dllimported variables and
4080 non-inlined functions on declaration as syntax errors. */
4081 else if (TREE_CODE (node
) == FUNCTION_DECL
&& DECL_INITIAL (node
))
4083 error ("function %q+D definition is marked dllimport", node
);
4084 *no_add_attrs
= true;
4087 else if (TREE_CODE (node
) == VAR_DECL
)
4089 if (DECL_INITIAL (node
))
4091 error ("variable %q+D definition is marked dllimport",
4093 *no_add_attrs
= true;
4096 /* `extern' needn't be specified with dllimport.
4097 Specify `extern' now and hope for the best. Sigh. */
4098 DECL_EXTERNAL (node
) = 1;
4099 /* Also, implicitly give dllimport'd variables declared within
4100 a function global scope, unless declared static. */
4101 if (current_function_decl
!= NULL_TREE
&& !TREE_STATIC (node
))
4102 TREE_PUBLIC (node
) = 1;
4105 if (*no_add_attrs
== false)
4106 DECL_DLLIMPORT_P (node
) = 1;
4109 /* Report error if symbol is not accessible at global scope. */
4110 if (!TREE_PUBLIC (node
)
4111 && (TREE_CODE (node
) == VAR_DECL
4112 || TREE_CODE (node
) == FUNCTION_DECL
))
4114 error ("external linkage required for symbol %q+D because of "
4115 "%qs attribute", node
, IDENTIFIER_POINTER (name
));
4116 *no_add_attrs
= true;
4119 /* A dllexport'd entity must have default visibility so that other
4120 program units (shared libraries or the main executable) can see
4121 it. A dllimport'd entity must have default visibility so that
4122 the linker knows that undefined references within this program
4123 unit can be resolved by the dynamic linker. */
4126 if (DECL_VISIBILITY_SPECIFIED (node
)
4127 && DECL_VISIBILITY (node
) != VISIBILITY_DEFAULT
)
4128 error ("%qs implies default visibility, but %qD has already "
4129 "been declared with a different visibility",
4130 IDENTIFIER_POINTER (name
), node
);
4131 DECL_VISIBILITY (node
) = VISIBILITY_DEFAULT
;
4132 DECL_VISIBILITY_SPECIFIED (node
) = 1;
4138 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
4140 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
4141 of the various TYPE_QUAL values. */
4144 set_type_quals (tree type
, int type_quals
)
4146 TYPE_READONLY (type
) = (type_quals
& TYPE_QUAL_CONST
) != 0;
4147 TYPE_VOLATILE (type
) = (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
4148 TYPE_RESTRICT (type
) = (type_quals
& TYPE_QUAL_RESTRICT
) != 0;
4151 /* Returns true iff cand is equivalent to base with type_quals. */
4154 check_qualified_type (const_tree cand
, const_tree base
, int type_quals
)
4156 return (TYPE_QUALS (cand
) == type_quals
4157 && TYPE_NAME (cand
) == TYPE_NAME (base
)
4158 /* Apparently this is needed for Objective-C. */
4159 && TYPE_CONTEXT (cand
) == TYPE_CONTEXT (base
)
4160 && attribute_list_equal (TYPE_ATTRIBUTES (cand
),
4161 TYPE_ATTRIBUTES (base
)));
4164 /* Return a version of the TYPE, qualified as indicated by the
4165 TYPE_QUALS, if one exists. If no qualified version exists yet,
4166 return NULL_TREE. */
4169 get_qualified_type (tree type
, int type_quals
)
4173 if (TYPE_QUALS (type
) == type_quals
)
4176 /* Search the chain of variants to see if there is already one there just
4177 like the one we need to have. If so, use that existing one. We must
4178 preserve the TYPE_NAME, since there is code that depends on this. */
4179 for (t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
4180 if (check_qualified_type (t
, type
, type_quals
))
4186 /* Like get_qualified_type, but creates the type if it does not
4187 exist. This function never returns NULL_TREE. */
4190 build_qualified_type (tree type
, int type_quals
)
4194 /* See if we already have the appropriate qualified variant. */
4195 t
= get_qualified_type (type
, type_quals
);
4197 /* If not, build it. */
4200 t
= build_variant_type_copy (type
);
4201 set_type_quals (t
, type_quals
);
4203 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
4204 /* Propagate structural equality. */
4205 SET_TYPE_STRUCTURAL_EQUALITY (t
);
4206 else if (TYPE_CANONICAL (type
) != type
)
4207 /* Build the underlying canonical type, since it is different
4209 TYPE_CANONICAL (t
) = build_qualified_type (TYPE_CANONICAL (type
),
4212 /* T is its own canonical type. */
4213 TYPE_CANONICAL (t
) = t
;
4220 /* Create a new distinct copy of TYPE. The new type is made its own
4221 MAIN_VARIANT. If TYPE requires structural equality checks, the
4222 resulting type requires structural equality checks; otherwise, its
4223 TYPE_CANONICAL points to itself. */
4226 build_distinct_type_copy (tree type
)
4228 tree t
= copy_node (type
);
4230 TYPE_POINTER_TO (t
) = 0;
4231 TYPE_REFERENCE_TO (t
) = 0;
4233 /* Set the canonical type either to a new equivalence class, or
4234 propagate the need for structural equality checks. */
4235 if (TYPE_STRUCTURAL_EQUALITY_P (type
))
4236 SET_TYPE_STRUCTURAL_EQUALITY (t
);
4238 TYPE_CANONICAL (t
) = t
;
4240 /* Make it its own variant. */
4241 TYPE_MAIN_VARIANT (t
) = t
;
4242 TYPE_NEXT_VARIANT (t
) = 0;
4244 /* Note that it is now possible for TYPE_MIN_VALUE to be a value
4245 whose TREE_TYPE is not t. This can also happen in the Ada
4246 frontend when using subtypes. */
4251 /* Create a new variant of TYPE, equivalent but distinct. This is so
4252 the caller can modify it. TYPE_CANONICAL for the return type will
4253 be equivalent to TYPE_CANONICAL of TYPE, indicating that the types
4254 are considered equal by the language itself (or that both types
4255 require structural equality checks). */
4258 build_variant_type_copy (tree type
)
4260 tree t
, m
= TYPE_MAIN_VARIANT (type
);
4262 t
= build_distinct_type_copy (type
);
4264 /* Since we're building a variant, assume that it is a non-semantic
4265 variant. This also propagates TYPE_STRUCTURAL_EQUALITY_P. */
4266 TYPE_CANONICAL (t
) = TYPE_CANONICAL (type
);
4268 /* Add the new type to the chain of variants of TYPE. */
4269 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (m
);
4270 TYPE_NEXT_VARIANT (m
) = t
;
4271 TYPE_MAIN_VARIANT (t
) = m
;
4276 /* Return true if the from tree in both tree maps are equal. */
4279 tree_map_base_eq (const void *va
, const void *vb
)
4281 const struct tree_map_base
*const a
= va
, *const b
= vb
;
4282 return (a
->from
== b
->from
);
4285 /* Hash a from tree in a tree_map. */
4288 tree_map_base_hash (const void *item
)
4290 return htab_hash_pointer (((const struct tree_map_base
*)item
)->from
);
4293 /* Return true if this tree map structure is marked for garbage collection
4294 purposes. We simply return true if the from tree is marked, so that this
4295 structure goes away when the from tree goes away. */
4298 tree_map_base_marked_p (const void *p
)
4300 return ggc_marked_p (((const struct tree_map_base
*) p
)->from
);
4304 tree_map_hash (const void *item
)
4306 return (((const struct tree_map
*) item
)->hash
);
4309 /* Return the initialization priority for DECL. */
4312 decl_init_priority_lookup (tree decl
)
4314 struct tree_priority_map
*h
;
4315 struct tree_map_base in
;
4317 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
4318 gcc_assert (TREE_CODE (decl
) == VAR_DECL
4319 ? DECL_HAS_INIT_PRIORITY_P (decl
)
4320 : DECL_STATIC_CONSTRUCTOR (decl
));
4322 h
= htab_find (init_priority_for_decl
, &in
);
4323 return h
? h
->init
: DEFAULT_INIT_PRIORITY
;
4326 /* Return the finalization priority for DECL. */
4329 decl_fini_priority_lookup (tree decl
)
4331 struct tree_priority_map
*h
;
4332 struct tree_map_base in
;
4334 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
);
4335 gcc_assert (DECL_STATIC_DESTRUCTOR (decl
));
4337 h
= htab_find (init_priority_for_decl
, &in
);
4338 return h
? h
->fini
: DEFAULT_INIT_PRIORITY
;
4341 /* Return the initialization and finalization priority information for
4342 DECL. If there is no previous priority information, a freshly
4343 allocated structure is returned. */
4345 static struct tree_priority_map
*
4346 decl_priority_info (tree decl
)
4348 struct tree_priority_map in
;
4349 struct tree_priority_map
*h
;
4352 in
.base
.from
= decl
;
4353 loc
= htab_find_slot (init_priority_for_decl
, &in
, INSERT
);
4357 h
= GGC_CNEW (struct tree_priority_map
);
4359 h
->base
.from
= decl
;
4360 h
->init
= DEFAULT_INIT_PRIORITY
;
4361 h
->fini
= DEFAULT_INIT_PRIORITY
;
4367 /* Set the initialization priority for DECL to PRIORITY. */
4370 decl_init_priority_insert (tree decl
, priority_type priority
)
4372 struct tree_priority_map
*h
;
4374 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
4375 h
= decl_priority_info (decl
);
4379 /* Set the finalization priority for DECL to PRIORITY. */
4382 decl_fini_priority_insert (tree decl
, priority_type priority
)
4384 struct tree_priority_map
*h
;
4386 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
);
4387 h
= decl_priority_info (decl
);
4391 /* Look up a restrict qualified base decl for FROM. */
4394 decl_restrict_base_lookup (tree from
)
4399 in
.base
.from
= from
;
4400 h
= htab_find_with_hash (restrict_base_for_decl
, &in
,
4401 htab_hash_pointer (from
));
4402 return h
? h
->to
: NULL_TREE
;
4405 /* Record the restrict qualified base TO for FROM. */
4408 decl_restrict_base_insert (tree from
, tree to
)
4413 h
= ggc_alloc (sizeof (struct tree_map
));
4414 h
->hash
= htab_hash_pointer (from
);
4415 h
->base
.from
= from
;
4417 loc
= htab_find_slot_with_hash (restrict_base_for_decl
, h
, h
->hash
, INSERT
);
4418 *(struct tree_map
**) loc
= h
;
4421 /* Print out the statistics for the DECL_DEBUG_EXPR hash table. */
4424 print_debug_expr_statistics (void)
4426 fprintf (stderr
, "DECL_DEBUG_EXPR hash: size %ld, %ld elements, %f collisions\n",
4427 (long) htab_size (debug_expr_for_decl
),
4428 (long) htab_elements (debug_expr_for_decl
),
4429 htab_collisions (debug_expr_for_decl
));
4432 /* Print out the statistics for the DECL_VALUE_EXPR hash table. */
4435 print_value_expr_statistics (void)
4437 fprintf (stderr
, "DECL_VALUE_EXPR hash: size %ld, %ld elements, %f collisions\n",
4438 (long) htab_size (value_expr_for_decl
),
4439 (long) htab_elements (value_expr_for_decl
),
4440 htab_collisions (value_expr_for_decl
));
4443 /* Print out statistics for the RESTRICT_BASE_FOR_DECL hash table, but
4444 don't print anything if the table is empty. */
4447 print_restrict_base_statistics (void)
4449 if (htab_elements (restrict_base_for_decl
) != 0)
4451 "RESTRICT_BASE hash: size %ld, %ld elements, %f collisions\n",
4452 (long) htab_size (restrict_base_for_decl
),
4453 (long) htab_elements (restrict_base_for_decl
),
4454 htab_collisions (restrict_base_for_decl
));
4457 /* Lookup a debug expression for FROM, and return it if we find one. */
4460 decl_debug_expr_lookup (tree from
)
4462 struct tree_map
*h
, in
;
4463 in
.base
.from
= from
;
4465 h
= htab_find_with_hash (debug_expr_for_decl
, &in
, htab_hash_pointer (from
));
4471 /* Insert a mapping FROM->TO in the debug expression hashtable. */
4474 decl_debug_expr_insert (tree from
, tree to
)
4479 h
= ggc_alloc (sizeof (struct tree_map
));
4480 h
->hash
= htab_hash_pointer (from
);
4481 h
->base
.from
= from
;
4483 loc
= htab_find_slot_with_hash (debug_expr_for_decl
, h
, h
->hash
, INSERT
);
4484 *(struct tree_map
**) loc
= h
;
4487 /* Lookup a value expression for FROM, and return it if we find one. */
4490 decl_value_expr_lookup (tree from
)
4492 struct tree_map
*h
, in
;
4493 in
.base
.from
= from
;
4495 h
= htab_find_with_hash (value_expr_for_decl
, &in
, htab_hash_pointer (from
));
4501 /* Insert a mapping FROM->TO in the value expression hashtable. */
4504 decl_value_expr_insert (tree from
, tree to
)
4509 h
= ggc_alloc (sizeof (struct tree_map
));
4510 h
->hash
= htab_hash_pointer (from
);
4511 h
->base
.from
= from
;
4513 loc
= htab_find_slot_with_hash (value_expr_for_decl
, h
, h
->hash
, INSERT
);
4514 *(struct tree_map
**) loc
= h
;
4517 /* Hashing of types so that we don't make duplicates.
4518 The entry point is `type_hash_canon'. */
4520 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
4521 with types in the TREE_VALUE slots), by adding the hash codes
4522 of the individual types. */
4525 type_hash_list (const_tree list
, hashval_t hashcode
)
4529 for (tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
4530 if (TREE_VALUE (tail
) != error_mark_node
)
4531 hashcode
= iterative_hash_object (TYPE_HASH (TREE_VALUE (tail
)),
4537 /* These are the Hashtable callback functions. */
4539 /* Returns true iff the types are equivalent. */
4542 type_hash_eq (const void *va
, const void *vb
)
4544 const struct type_hash
*const a
= va
, *const b
= vb
;
4546 /* First test the things that are the same for all types. */
4547 if (a
->hash
!= b
->hash
4548 || TREE_CODE (a
->type
) != TREE_CODE (b
->type
)
4549 || TREE_TYPE (a
->type
) != TREE_TYPE (b
->type
)
4550 || !attribute_list_equal (TYPE_ATTRIBUTES (a
->type
),
4551 TYPE_ATTRIBUTES (b
->type
))
4552 || TYPE_ALIGN (a
->type
) != TYPE_ALIGN (b
->type
)
4553 || TYPE_MODE (a
->type
) != TYPE_MODE (b
->type
))
4556 switch (TREE_CODE (a
->type
))
4561 case REFERENCE_TYPE
:
4565 return TYPE_VECTOR_SUBPARTS (a
->type
) == TYPE_VECTOR_SUBPARTS (b
->type
);
4568 if (TYPE_VALUES (a
->type
) != TYPE_VALUES (b
->type
)
4569 && !(TYPE_VALUES (a
->type
)
4570 && TREE_CODE (TYPE_VALUES (a
->type
)) == TREE_LIST
4571 && TYPE_VALUES (b
->type
)
4572 && TREE_CODE (TYPE_VALUES (b
->type
)) == TREE_LIST
4573 && type_list_equal (TYPE_VALUES (a
->type
),
4574 TYPE_VALUES (b
->type
))))
4577 /* ... fall through ... */
4582 return ((TYPE_MAX_VALUE (a
->type
) == TYPE_MAX_VALUE (b
->type
)
4583 || tree_int_cst_equal (TYPE_MAX_VALUE (a
->type
),
4584 TYPE_MAX_VALUE (b
->type
)))
4585 && (TYPE_MIN_VALUE (a
->type
) == TYPE_MIN_VALUE (b
->type
)
4586 || tree_int_cst_equal (TYPE_MIN_VALUE (a
->type
),
4587 TYPE_MIN_VALUE (b
->type
))));
4589 case FIXED_POINT_TYPE
:
4590 return TYPE_SATURATING (a
->type
) == TYPE_SATURATING (b
->type
);
4593 return TYPE_OFFSET_BASETYPE (a
->type
) == TYPE_OFFSET_BASETYPE (b
->type
);
4596 return (TYPE_METHOD_BASETYPE (a
->type
) == TYPE_METHOD_BASETYPE (b
->type
)
4597 && (TYPE_ARG_TYPES (a
->type
) == TYPE_ARG_TYPES (b
->type
)
4598 || (TYPE_ARG_TYPES (a
->type
)
4599 && TREE_CODE (TYPE_ARG_TYPES (a
->type
)) == TREE_LIST
4600 && TYPE_ARG_TYPES (b
->type
)
4601 && TREE_CODE (TYPE_ARG_TYPES (b
->type
)) == TREE_LIST
4602 && type_list_equal (TYPE_ARG_TYPES (a
->type
),
4603 TYPE_ARG_TYPES (b
->type
)))));
4606 return TYPE_DOMAIN (a
->type
) == TYPE_DOMAIN (b
->type
);
4610 case QUAL_UNION_TYPE
:
4611 return (TYPE_FIELDS (a
->type
) == TYPE_FIELDS (b
->type
)
4612 || (TYPE_FIELDS (a
->type
)
4613 && TREE_CODE (TYPE_FIELDS (a
->type
)) == TREE_LIST
4614 && TYPE_FIELDS (b
->type
)
4615 && TREE_CODE (TYPE_FIELDS (b
->type
)) == TREE_LIST
4616 && type_list_equal (TYPE_FIELDS (a
->type
),
4617 TYPE_FIELDS (b
->type
))));
4620 return (TYPE_ARG_TYPES (a
->type
) == TYPE_ARG_TYPES (b
->type
)
4621 || (TYPE_ARG_TYPES (a
->type
)
4622 && TREE_CODE (TYPE_ARG_TYPES (a
->type
)) == TREE_LIST
4623 && TYPE_ARG_TYPES (b
->type
)
4624 && TREE_CODE (TYPE_ARG_TYPES (b
->type
)) == TREE_LIST
4625 && type_list_equal (TYPE_ARG_TYPES (a
->type
),
4626 TYPE_ARG_TYPES (b
->type
))));
4633 /* Return the cached hash value. */
4636 type_hash_hash (const void *item
)
4638 return ((const struct type_hash
*) item
)->hash
;
4641 /* Look in the type hash table for a type isomorphic to TYPE.
4642 If one is found, return it. Otherwise return 0. */
4645 type_hash_lookup (hashval_t hashcode
, tree type
)
4647 struct type_hash
*h
, in
;
4649 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
4650 must call that routine before comparing TYPE_ALIGNs. */
4656 h
= htab_find_with_hash (type_hash_table
, &in
, hashcode
);
4662 /* Add an entry to the type-hash-table
4663 for a type TYPE whose hash code is HASHCODE. */
4666 type_hash_add (hashval_t hashcode
, tree type
)
4668 struct type_hash
*h
;
4671 h
= ggc_alloc (sizeof (struct type_hash
));
4674 loc
= htab_find_slot_with_hash (type_hash_table
, h
, hashcode
, INSERT
);
4675 *(struct type_hash
**) loc
= h
;
4678 /* Given TYPE, and HASHCODE its hash code, return the canonical
4679 object for an identical type if one already exists.
4680 Otherwise, return TYPE, and record it as the canonical object.
4682 To use this function, first create a type of the sort you want.
4683 Then compute its hash code from the fields of the type that
4684 make it different from other similar types.
4685 Then call this function and use the value. */
4688 type_hash_canon (unsigned int hashcode
, tree type
)
4692 /* The hash table only contains main variants, so ensure that's what we're
4694 gcc_assert (TYPE_MAIN_VARIANT (type
) == type
);
4696 if (!lang_hooks
.types
.hash_types
)
4699 /* See if the type is in the hash table already. If so, return it.
4700 Otherwise, add the type. */
4701 t1
= type_hash_lookup (hashcode
, type
);
4704 #ifdef GATHER_STATISTICS
4705 tree_node_counts
[(int) t_kind
]--;
4706 tree_node_sizes
[(int) t_kind
] -= sizeof (struct tree_type
);
4712 type_hash_add (hashcode
, type
);
4717 /* See if the data pointed to by the type hash table is marked. We consider
4718 it marked if the type is marked or if a debug type number or symbol
4719 table entry has been made for the type. This reduces the amount of
4720 debugging output and eliminates that dependency of the debug output on
4721 the number of garbage collections. */
4724 type_hash_marked_p (const void *p
)
4726 const_tree
const type
= ((const struct type_hash
*) p
)->type
;
4728 return ggc_marked_p (type
) || TYPE_SYMTAB_POINTER (type
);
4732 print_type_hash_statistics (void)
4734 fprintf (stderr
, "Type hash: size %ld, %ld elements, %f collisions\n",
4735 (long) htab_size (type_hash_table
),
4736 (long) htab_elements (type_hash_table
),
4737 htab_collisions (type_hash_table
));
4740 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
4741 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
4742 by adding the hash codes of the individual attributes. */
4745 attribute_hash_list (const_tree list
, hashval_t hashcode
)
4749 for (tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
4750 /* ??? Do we want to add in TREE_VALUE too? */
4751 hashcode
= iterative_hash_object
4752 (IDENTIFIER_HASH_VALUE (TREE_PURPOSE (tail
)), hashcode
);
4756 /* Given two lists of attributes, return true if list l2 is
4757 equivalent to l1. */
4760 attribute_list_equal (tree l1
, tree l2
)
4762 return attribute_list_contained (l1
, l2
)
4763 && attribute_list_contained (l2
, l1
);
4766 /* Given two lists of attributes, return true if list L2 is
4767 completely contained within L1. */
4768 /* ??? This would be faster if attribute names were stored in a canonicalized
4769 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
4770 must be used to show these elements are equivalent (which they are). */
4771 /* ??? It's not clear that attributes with arguments will always be handled
4775 attribute_list_contained (tree l1
, tree l2
)
4779 /* First check the obvious, maybe the lists are identical. */
4783 /* Maybe the lists are similar. */
4784 for (t1
= l1
, t2
= l2
;
4786 && TREE_PURPOSE (t1
) == TREE_PURPOSE (t2
)
4787 && TREE_VALUE (t1
) == TREE_VALUE (t2
);
4788 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
));
4790 /* Maybe the lists are equal. */
4791 if (t1
== 0 && t2
== 0)
4794 for (; t2
!= 0; t2
= TREE_CHAIN (t2
))
4797 for (attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)), l1
);
4799 attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)),
4802 if (TREE_VALUE (t2
) != NULL
4803 && TREE_CODE (TREE_VALUE (t2
)) == TREE_LIST
4804 && TREE_VALUE (attr
) != NULL
4805 && TREE_CODE (TREE_VALUE (attr
)) == TREE_LIST
)
4807 if (simple_cst_list_equal (TREE_VALUE (t2
),
4808 TREE_VALUE (attr
)) == 1)
4811 else if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) == 1)
4822 /* Given two lists of types
4823 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
4824 return 1 if the lists contain the same types in the same order.
4825 Also, the TREE_PURPOSEs must match. */
4828 type_list_equal (const_tree l1
, const_tree l2
)
4832 for (t1
= l1
, t2
= l2
; t1
&& t2
; t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
4833 if (TREE_VALUE (t1
) != TREE_VALUE (t2
)
4834 || (TREE_PURPOSE (t1
) != TREE_PURPOSE (t2
)
4835 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1
), TREE_PURPOSE (t2
))
4836 && (TREE_TYPE (TREE_PURPOSE (t1
))
4837 == TREE_TYPE (TREE_PURPOSE (t2
))))))
4843 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
4844 given by TYPE. If the argument list accepts variable arguments,
4845 then this function counts only the ordinary arguments. */
4848 type_num_arguments (const_tree type
)
4853 for (t
= TYPE_ARG_TYPES (type
); t
; t
= TREE_CHAIN (t
))
4854 /* If the function does not take a variable number of arguments,
4855 the last element in the list will have type `void'. */
4856 if (VOID_TYPE_P (TREE_VALUE (t
)))
4864 /* Nonzero if integer constants T1 and T2
4865 represent the same constant value. */
4868 tree_int_cst_equal (const_tree t1
, const_tree t2
)
4873 if (t1
== 0 || t2
== 0)
4876 if (TREE_CODE (t1
) == INTEGER_CST
4877 && TREE_CODE (t2
) == INTEGER_CST
4878 && TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
4879 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
))
4885 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
4886 The precise way of comparison depends on their data type. */
4889 tree_int_cst_lt (const_tree t1
, const_tree t2
)
4894 if (TYPE_UNSIGNED (TREE_TYPE (t1
)) != TYPE_UNSIGNED (TREE_TYPE (t2
)))
4896 int t1_sgn
= tree_int_cst_sgn (t1
);
4897 int t2_sgn
= tree_int_cst_sgn (t2
);
4899 if (t1_sgn
< t2_sgn
)
4901 else if (t1_sgn
> t2_sgn
)
4903 /* Otherwise, both are non-negative, so we compare them as
4904 unsigned just in case one of them would overflow a signed
4907 else if (!TYPE_UNSIGNED (TREE_TYPE (t1
)))
4908 return INT_CST_LT (t1
, t2
);
4910 return INT_CST_LT_UNSIGNED (t1
, t2
);
4913 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
4916 tree_int_cst_compare (const_tree t1
, const_tree t2
)
4918 if (tree_int_cst_lt (t1
, t2
))
4920 else if (tree_int_cst_lt (t2
, t1
))
4926 /* Return 1 if T is an INTEGER_CST that can be manipulated efficiently on
4927 the host. If POS is zero, the value can be represented in a single
4928 HOST_WIDE_INT. If POS is nonzero, the value must be non-negative and can
4929 be represented in a single unsigned HOST_WIDE_INT. */
4932 host_integerp (const_tree t
, int pos
)
4934 return (TREE_CODE (t
) == INTEGER_CST
4935 && ((TREE_INT_CST_HIGH (t
) == 0
4936 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) >= 0)
4937 || (! pos
&& TREE_INT_CST_HIGH (t
) == -1
4938 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0
4939 && !TYPE_UNSIGNED (TREE_TYPE (t
)))
4940 || (pos
&& TREE_INT_CST_HIGH (t
) == 0)));
4943 /* Return the HOST_WIDE_INT least significant bits of T if it is an
4944 INTEGER_CST and there is no overflow. POS is nonzero if the result must
4945 be non-negative. We must be able to satisfy the above conditions. */
4948 tree_low_cst (const_tree t
, int pos
)
4950 gcc_assert (host_integerp (t
, pos
));
4951 return TREE_INT_CST_LOW (t
);
4954 /* Return the most significant bit of the integer constant T. */
4957 tree_int_cst_msb (const_tree t
)
4961 unsigned HOST_WIDE_INT l
;
4963 /* Note that using TYPE_PRECISION here is wrong. We care about the
4964 actual bits, not the (arbitrary) range of the type. */
4965 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t
))) - 1;
4966 rshift_double (TREE_INT_CST_LOW (t
), TREE_INT_CST_HIGH (t
), prec
,
4967 2 * HOST_BITS_PER_WIDE_INT
, &l
, &h
, 0);
4968 return (l
& 1) == 1;
4971 /* Return an indication of the sign of the integer constant T.
4972 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
4973 Note that -1 will never be returned if T's type is unsigned. */
4976 tree_int_cst_sgn (const_tree t
)
4978 if (TREE_INT_CST_LOW (t
) == 0 && TREE_INT_CST_HIGH (t
) == 0)
4980 else if (TYPE_UNSIGNED (TREE_TYPE (t
)))
4982 else if (TREE_INT_CST_HIGH (t
) < 0)
4988 /* Compare two constructor-element-type constants. Return 1 if the lists
4989 are known to be equal; otherwise return 0. */
4992 simple_cst_list_equal (const_tree l1
, const_tree l2
)
4994 while (l1
!= NULL_TREE
&& l2
!= NULL_TREE
)
4996 if (simple_cst_equal (TREE_VALUE (l1
), TREE_VALUE (l2
)) != 1)
4999 l1
= TREE_CHAIN (l1
);
5000 l2
= TREE_CHAIN (l2
);
5006 /* Return truthvalue of whether T1 is the same tree structure as T2.
5007 Return 1 if they are the same.
5008 Return 0 if they are understandably different.
5009 Return -1 if either contains tree structure not understood by
5013 simple_cst_equal (const_tree t1
, const_tree t2
)
5015 enum tree_code code1
, code2
;
5021 if (t1
== 0 || t2
== 0)
5024 code1
= TREE_CODE (t1
);
5025 code2
= TREE_CODE (t2
);
5027 if (code1
== NOP_EXPR
|| code1
== CONVERT_EXPR
|| code1
== NON_LVALUE_EXPR
)
5029 if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
5030 || code2
== NON_LVALUE_EXPR
)
5031 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
5033 return simple_cst_equal (TREE_OPERAND (t1
, 0), t2
);
5036 else if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
5037 || code2
== NON_LVALUE_EXPR
)
5038 return simple_cst_equal (t1
, TREE_OPERAND (t2
, 0));
5046 return (TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
5047 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
));
5050 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
5053 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
5056 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
5057 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
5058 TREE_STRING_LENGTH (t1
)));
5062 unsigned HOST_WIDE_INT idx
;
5063 VEC(constructor_elt
, gc
) *v1
= CONSTRUCTOR_ELTS (t1
);
5064 VEC(constructor_elt
, gc
) *v2
= CONSTRUCTOR_ELTS (t2
);
5066 if (VEC_length (constructor_elt
, v1
) != VEC_length (constructor_elt
, v2
))
5069 for (idx
= 0; idx
< VEC_length (constructor_elt
, v1
); ++idx
)
5070 /* ??? Should we handle also fields here? */
5071 if (!simple_cst_equal (VEC_index (constructor_elt
, v1
, idx
)->value
,
5072 VEC_index (constructor_elt
, v2
, idx
)->value
))
5078 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
5081 cmp
= simple_cst_equal (CALL_EXPR_FN (t1
), CALL_EXPR_FN (t2
));
5084 if (call_expr_nargs (t1
) != call_expr_nargs (t2
))
5087 const_tree arg1
, arg2
;
5088 const_call_expr_arg_iterator iter1
, iter2
;
5089 for (arg1
= first_const_call_expr_arg (t1
, &iter1
),
5090 arg2
= first_const_call_expr_arg (t2
, &iter2
);
5092 arg1
= next_const_call_expr_arg (&iter1
),
5093 arg2
= next_const_call_expr_arg (&iter2
))
5095 cmp
= simple_cst_equal (arg1
, arg2
);
5099 return arg1
== arg2
;
5103 /* Special case: if either target is an unallocated VAR_DECL,
5104 it means that it's going to be unified with whatever the
5105 TARGET_EXPR is really supposed to initialize, so treat it
5106 as being equivalent to anything. */
5107 if ((TREE_CODE (TREE_OPERAND (t1
, 0)) == VAR_DECL
5108 && DECL_NAME (TREE_OPERAND (t1
, 0)) == NULL_TREE
5109 && !DECL_RTL_SET_P (TREE_OPERAND (t1
, 0)))
5110 || (TREE_CODE (TREE_OPERAND (t2
, 0)) == VAR_DECL
5111 && DECL_NAME (TREE_OPERAND (t2
, 0)) == NULL_TREE
5112 && !DECL_RTL_SET_P (TREE_OPERAND (t2
, 0))))
5115 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
5120 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
5122 case WITH_CLEANUP_EXPR
:
5123 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
5127 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t1
, 1));
5130 if (TREE_OPERAND (t1
, 1) == TREE_OPERAND (t2
, 1))
5131 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
5145 /* This general rule works for most tree codes. All exceptions should be
5146 handled above. If this is a language-specific tree code, we can't
5147 trust what might be in the operand, so say we don't know
5149 if ((int) code1
>= (int) LAST_AND_UNUSED_TREE_CODE
)
5152 switch (TREE_CODE_CLASS (code1
))
5156 case tcc_comparison
:
5157 case tcc_expression
:
5161 for (i
= 0; i
< TREE_CODE_LENGTH (code1
); i
++)
5163 cmp
= simple_cst_equal (TREE_OPERAND (t1
, i
), TREE_OPERAND (t2
, i
));
5175 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
5176 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
5177 than U, respectively. */
5180 compare_tree_int (const_tree t
, unsigned HOST_WIDE_INT u
)
5182 if (tree_int_cst_sgn (t
) < 0)
5184 else if (TREE_INT_CST_HIGH (t
) != 0)
5186 else if (TREE_INT_CST_LOW (t
) == u
)
5188 else if (TREE_INT_CST_LOW (t
) < u
)
5194 /* Return true if CODE represents an associative tree code. Otherwise
5197 associative_tree_code (enum tree_code code
)
5216 /* Return true if CODE represents a commutative tree code. Otherwise
5219 commutative_tree_code (enum tree_code code
)
5232 case UNORDERED_EXPR
:
5236 case TRUTH_AND_EXPR
:
5237 case TRUTH_XOR_EXPR
:
5247 /* Generate a hash value for an expression. This can be used iteratively
5248 by passing a previous result as the "val" argument.
5250 This function is intended to produce the same hash for expressions which
5251 would compare equal using operand_equal_p. */
5254 iterative_hash_expr (const_tree t
, hashval_t val
)
5257 enum tree_code code
;
5261 return iterative_hash_pointer (t
, val
);
5263 code
= TREE_CODE (t
);
5267 /* Alas, constants aren't shared, so we can't rely on pointer
5270 val
= iterative_hash_host_wide_int (TREE_INT_CST_LOW (t
), val
);
5271 return iterative_hash_host_wide_int (TREE_INT_CST_HIGH (t
), val
);
5274 unsigned int val2
= real_hash (TREE_REAL_CST_PTR (t
));
5276 return iterative_hash_hashval_t (val2
, val
);
5280 unsigned int val2
= fixed_hash (TREE_FIXED_CST_PTR (t
));
5282 return iterative_hash_hashval_t (val2
, val
);
5285 return iterative_hash (TREE_STRING_POINTER (t
),
5286 TREE_STRING_LENGTH (t
), val
);
5288 val
= iterative_hash_expr (TREE_REALPART (t
), val
);
5289 return iterative_hash_expr (TREE_IMAGPART (t
), val
);
5291 return iterative_hash_expr (TREE_VECTOR_CST_ELTS (t
), val
);
5295 /* we can just compare by pointer. */
5296 return iterative_hash_pointer (t
, val
);
5299 /* A list of expressions, for a CALL_EXPR or as the elements of a
5301 for (; t
; t
= TREE_CHAIN (t
))
5302 val
= iterative_hash_expr (TREE_VALUE (t
), val
);
5306 unsigned HOST_WIDE_INT idx
;
5308 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (t
), idx
, field
, value
)
5310 val
= iterative_hash_expr (field
, val
);
5311 val
= iterative_hash_expr (value
, val
);
5316 /* When referring to a built-in FUNCTION_DECL, use the
5317 __builtin__ form. Otherwise nodes that compare equal
5318 according to operand_equal_p might get different
5320 if (DECL_BUILT_IN (t
))
5322 val
= iterative_hash_pointer (built_in_decls
[DECL_FUNCTION_CODE (t
)],
5326 /* else FALL THROUGH */
5328 class = TREE_CODE_CLASS (code
);
5330 if (class == tcc_declaration
)
5332 /* DECL's have a unique ID */
5333 val
= iterative_hash_host_wide_int (DECL_UID (t
), val
);
5337 gcc_assert (IS_EXPR_CODE_CLASS (class));
5339 val
= iterative_hash_object (code
, val
);
5341 /* Don't hash the type, that can lead to having nodes which
5342 compare equal according to operand_equal_p, but which
5343 have different hash codes. */
5344 if (code
== NOP_EXPR
5345 || code
== CONVERT_EXPR
5346 || code
== NON_LVALUE_EXPR
)
5348 /* Make sure to include signness in the hash computation. */
5349 val
+= TYPE_UNSIGNED (TREE_TYPE (t
));
5350 val
= iterative_hash_expr (TREE_OPERAND (t
, 0), val
);
5353 else if (commutative_tree_code (code
))
5355 /* It's a commutative expression. We want to hash it the same
5356 however it appears. We do this by first hashing both operands
5357 and then rehashing based on the order of their independent
5359 hashval_t one
= iterative_hash_expr (TREE_OPERAND (t
, 0), 0);
5360 hashval_t two
= iterative_hash_expr (TREE_OPERAND (t
, 1), 0);
5364 t
= one
, one
= two
, two
= t
;
5366 val
= iterative_hash_hashval_t (one
, val
);
5367 val
= iterative_hash_hashval_t (two
, val
);
5370 for (i
= TREE_OPERAND_LENGTH (t
) - 1; i
>= 0; --i
)
5371 val
= iterative_hash_expr (TREE_OPERAND (t
, i
), val
);
5378 /* Constructors for pointer, array and function types.
5379 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
5380 constructed by language-dependent code, not here.) */
5382 /* Construct, lay out and return the type of pointers to TO_TYPE with
5383 mode MODE. If CAN_ALIAS_ALL is TRUE, indicate this type can
5384 reference all of memory. If such a type has already been
5385 constructed, reuse it. */
5388 build_pointer_type_for_mode (tree to_type
, enum machine_mode mode
,
5393 if (to_type
== error_mark_node
)
5394 return error_mark_node
;
5396 /* In some cases, languages will have things that aren't a POINTER_TYPE
5397 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_POINTER_TO.
5398 In that case, return that type without regard to the rest of our
5401 ??? This is a kludge, but consistent with the way this function has
5402 always operated and there doesn't seem to be a good way to avoid this
5404 if (TYPE_POINTER_TO (to_type
) != 0
5405 && TREE_CODE (TYPE_POINTER_TO (to_type
)) != POINTER_TYPE
)
5406 return TYPE_POINTER_TO (to_type
);
5408 /* First, if we already have a type for pointers to TO_TYPE and it's
5409 the proper mode, use it. */
5410 for (t
= TYPE_POINTER_TO (to_type
); t
; t
= TYPE_NEXT_PTR_TO (t
))
5411 if (TYPE_MODE (t
) == mode
&& TYPE_REF_CAN_ALIAS_ALL (t
) == can_alias_all
)
5414 t
= make_node (POINTER_TYPE
);
5416 TREE_TYPE (t
) = to_type
;
5417 TYPE_MODE (t
) = mode
;
5418 TYPE_REF_CAN_ALIAS_ALL (t
) = can_alias_all
;
5419 TYPE_NEXT_PTR_TO (t
) = TYPE_POINTER_TO (to_type
);
5420 TYPE_POINTER_TO (to_type
) = t
;
5422 if (TYPE_STRUCTURAL_EQUALITY_P (to_type
))
5423 SET_TYPE_STRUCTURAL_EQUALITY (t
);
5424 else if (TYPE_CANONICAL (to_type
) != to_type
)
5426 = build_pointer_type_for_mode (TYPE_CANONICAL (to_type
),
5427 mode
, can_alias_all
);
5429 /* Lay out the type. This function has many callers that are concerned
5430 with expression-construction, and this simplifies them all. */
5436 /* By default build pointers in ptr_mode. */
5439 build_pointer_type (tree to_type
)
5441 return build_pointer_type_for_mode (to_type
, ptr_mode
, false);
5444 /* Same as build_pointer_type_for_mode, but for REFERENCE_TYPE. */
5447 build_reference_type_for_mode (tree to_type
, enum machine_mode mode
,
5452 /* In some cases, languages will have things that aren't a REFERENCE_TYPE
5453 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_REFERENCE_TO.
5454 In that case, return that type without regard to the rest of our
5457 ??? This is a kludge, but consistent with the way this function has
5458 always operated and there doesn't seem to be a good way to avoid this
5460 if (TYPE_REFERENCE_TO (to_type
) != 0
5461 && TREE_CODE (TYPE_REFERENCE_TO (to_type
)) != REFERENCE_TYPE
)
5462 return TYPE_REFERENCE_TO (to_type
);
5464 /* First, if we already have a type for pointers to TO_TYPE and it's
5465 the proper mode, use it. */
5466 for (t
= TYPE_REFERENCE_TO (to_type
); t
; t
= TYPE_NEXT_REF_TO (t
))
5467 if (TYPE_MODE (t
) == mode
&& TYPE_REF_CAN_ALIAS_ALL (t
) == can_alias_all
)
5470 t
= make_node (REFERENCE_TYPE
);
5472 TREE_TYPE (t
) = to_type
;
5473 TYPE_MODE (t
) = mode
;
5474 TYPE_REF_CAN_ALIAS_ALL (t
) = can_alias_all
;
5475 TYPE_NEXT_REF_TO (t
) = TYPE_REFERENCE_TO (to_type
);
5476 TYPE_REFERENCE_TO (to_type
) = t
;
5478 if (TYPE_STRUCTURAL_EQUALITY_P (to_type
))
5479 SET_TYPE_STRUCTURAL_EQUALITY (t
);
5480 else if (TYPE_CANONICAL (to_type
) != to_type
)
5482 = build_reference_type_for_mode (TYPE_CANONICAL (to_type
),
5483 mode
, can_alias_all
);
5491 /* Build the node for the type of references-to-TO_TYPE by default
5495 build_reference_type (tree to_type
)
5497 return build_reference_type_for_mode (to_type
, ptr_mode
, false);
5500 /* Build a type that is compatible with t but has no cv quals anywhere
5503 const char *const *const * -> char ***. */
5506 build_type_no_quals (tree t
)
5508 switch (TREE_CODE (t
))
5511 return build_pointer_type_for_mode (build_type_no_quals (TREE_TYPE (t
)),
5513 TYPE_REF_CAN_ALIAS_ALL (t
));
5514 case REFERENCE_TYPE
:
5516 build_reference_type_for_mode (build_type_no_quals (TREE_TYPE (t
)),
5518 TYPE_REF_CAN_ALIAS_ALL (t
));
5520 return TYPE_MAIN_VARIANT (t
);
5524 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
5525 MAXVAL should be the maximum value in the domain
5526 (one less than the length of the array).
5528 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
5529 We don't enforce this limit, that is up to caller (e.g. language front end).
5530 The limit exists because the result is a signed type and we don't handle
5531 sizes that use more than one HOST_WIDE_INT. */
5534 build_index_type (tree maxval
)
5536 tree itype
= make_node (INTEGER_TYPE
);
5538 TREE_TYPE (itype
) = sizetype
;
5539 TYPE_PRECISION (itype
) = TYPE_PRECISION (sizetype
);
5540 TYPE_MIN_VALUE (itype
) = size_zero_node
;
5541 TYPE_MAX_VALUE (itype
) = fold_convert (sizetype
, maxval
);
5542 TYPE_MODE (itype
) = TYPE_MODE (sizetype
);
5543 TYPE_SIZE (itype
) = TYPE_SIZE (sizetype
);
5544 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (sizetype
);
5545 TYPE_ALIGN (itype
) = TYPE_ALIGN (sizetype
);
5546 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (sizetype
);
5548 if (host_integerp (maxval
, 1))
5549 return type_hash_canon (tree_low_cst (maxval
, 1), itype
);
5552 /* Since we cannot hash this type, we need to compare it using
5553 structural equality checks. */
5554 SET_TYPE_STRUCTURAL_EQUALITY (itype
);
5559 /* Builds a signed or unsigned integer type of precision PRECISION.
5560 Used for C bitfields whose precision does not match that of
5561 built-in target types. */
5563 build_nonstandard_integer_type (unsigned HOST_WIDE_INT precision
,
5566 tree itype
= make_node (INTEGER_TYPE
);
5568 TYPE_PRECISION (itype
) = precision
;
5571 fixup_unsigned_type (itype
);
5573 fixup_signed_type (itype
);
5575 if (host_integerp (TYPE_MAX_VALUE (itype
), 1))
5576 return type_hash_canon (tree_low_cst (TYPE_MAX_VALUE (itype
), 1), itype
);
5581 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
5582 ENUMERAL_TYPE or BOOLEAN_TYPE), with low bound LOWVAL and
5583 high bound HIGHVAL. If TYPE is NULL, sizetype is used. */
5586 build_range_type (tree type
, tree lowval
, tree highval
)
5588 tree itype
= make_node (INTEGER_TYPE
);
5590 TREE_TYPE (itype
) = type
;
5591 if (type
== NULL_TREE
)
5594 TYPE_MIN_VALUE (itype
) = fold_convert (type
, lowval
);
5595 TYPE_MAX_VALUE (itype
) = highval
? fold_convert (type
, highval
) : NULL
;
5597 TYPE_PRECISION (itype
) = TYPE_PRECISION (type
);
5598 TYPE_MODE (itype
) = TYPE_MODE (type
);
5599 TYPE_SIZE (itype
) = TYPE_SIZE (type
);
5600 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (type
);
5601 TYPE_ALIGN (itype
) = TYPE_ALIGN (type
);
5602 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (type
);
5604 if (host_integerp (lowval
, 0) && highval
!= 0 && host_integerp (highval
, 0))
5605 return type_hash_canon (tree_low_cst (highval
, 0)
5606 - tree_low_cst (lowval
, 0),
5612 /* Just like build_index_type, but takes lowval and highval instead
5613 of just highval (maxval). */
5616 build_index_2_type (tree lowval
, tree highval
)
5618 return build_range_type (sizetype
, lowval
, highval
);
5621 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
5622 and number of elements specified by the range of values of INDEX_TYPE.
5623 If such a type has already been constructed, reuse it. */
5626 build_array_type (tree elt_type
, tree index_type
)
5629 hashval_t hashcode
= 0;
5631 if (TREE_CODE (elt_type
) == FUNCTION_TYPE
)
5633 error ("arrays of functions are not meaningful");
5634 elt_type
= integer_type_node
;
5637 t
= make_node (ARRAY_TYPE
);
5638 TREE_TYPE (t
) = elt_type
;
5639 TYPE_DOMAIN (t
) = index_type
;
5641 if (index_type
== 0)
5644 hashcode
= iterative_hash_object (TYPE_HASH (elt_type
), hashcode
);
5645 t
= type_hash_canon (hashcode
, t
);
5649 if (TYPE_CANONICAL (t
) == t
)
5651 if (TYPE_STRUCTURAL_EQUALITY_P (elt_type
))
5652 SET_TYPE_STRUCTURAL_EQUALITY (t
);
5653 else if (TYPE_CANONICAL (elt_type
) != elt_type
)
5655 = build_array_type (TYPE_CANONICAL (elt_type
), index_type
);
5661 hashcode
= iterative_hash_object (TYPE_HASH (elt_type
), hashcode
);
5662 hashcode
= iterative_hash_object (TYPE_HASH (index_type
), hashcode
);
5663 t
= type_hash_canon (hashcode
, t
);
5665 if (!COMPLETE_TYPE_P (t
))
5668 if (TYPE_CANONICAL (t
) == t
)
5670 if (TYPE_STRUCTURAL_EQUALITY_P (elt_type
)
5671 || TYPE_STRUCTURAL_EQUALITY_P (index_type
))
5672 SET_TYPE_STRUCTURAL_EQUALITY (t
);
5673 else if (TYPE_CANONICAL (elt_type
) != elt_type
5674 || TYPE_CANONICAL (index_type
) != index_type
)
5676 = build_array_type (TYPE_CANONICAL (elt_type
),
5677 TYPE_CANONICAL (index_type
));
5683 /* Return the TYPE of the elements comprising
5684 the innermost dimension of ARRAY. */
5687 get_inner_array_type (const_tree array
)
5689 tree type
= TREE_TYPE (array
);
5691 while (TREE_CODE (type
) == ARRAY_TYPE
)
5692 type
= TREE_TYPE (type
);
5697 /* Computes the canonical argument types from the argument type list
5700 Upon return, *ANY_STRUCTURAL_P will be true iff either it was true
5701 on entry to this function, or if any of the ARGTYPES are
5704 Upon return, *ANY_NONCANONICAL_P will be true iff either it was
5705 true on entry to this function, or if any of the ARGTYPES are
5708 Returns a canonical argument list, which may be ARGTYPES when the
5709 canonical argument list is unneeded (i.e., *ANY_STRUCTURAL_P is
5710 true) or would not differ from ARGTYPES. */
5713 maybe_canonicalize_argtypes(tree argtypes
,
5714 bool *any_structural_p
,
5715 bool *any_noncanonical_p
)
5718 bool any_noncanonical_argtypes_p
= false;
5720 for (arg
= argtypes
; arg
&& !(*any_structural_p
); arg
= TREE_CHAIN (arg
))
5722 if (!TREE_VALUE (arg
) || TREE_VALUE (arg
) == error_mark_node
)
5723 /* Fail gracefully by stating that the type is structural. */
5724 *any_structural_p
= true;
5725 else if (TYPE_STRUCTURAL_EQUALITY_P (TREE_VALUE (arg
)))
5726 *any_structural_p
= true;
5727 else if (TYPE_CANONICAL (TREE_VALUE (arg
)) != TREE_VALUE (arg
)
5728 || TREE_PURPOSE (arg
))
5729 /* If the argument has a default argument, we consider it
5730 non-canonical even though the type itself is canonical.
5731 That way, different variants of function and method types
5732 with default arguments will all point to the variant with
5733 no defaults as their canonical type. */
5734 any_noncanonical_argtypes_p
= true;
5737 if (*any_structural_p
)
5740 if (any_noncanonical_argtypes_p
)
5742 /* Build the canonical list of argument types. */
5743 tree canon_argtypes
= NULL_TREE
;
5744 bool is_void
= false;
5746 for (arg
= argtypes
; arg
; arg
= TREE_CHAIN (arg
))
5748 if (arg
== void_list_node
)
5751 canon_argtypes
= tree_cons (NULL_TREE
,
5752 TYPE_CANONICAL (TREE_VALUE (arg
)),
5756 canon_argtypes
= nreverse (canon_argtypes
);
5758 canon_argtypes
= chainon (canon_argtypes
, void_list_node
);
5760 /* There is a non-canonical type. */
5761 *any_noncanonical_p
= true;
5762 return canon_argtypes
;
5765 /* The canonical argument types are the same as ARGTYPES. */
5769 /* Construct, lay out and return
5770 the type of functions returning type VALUE_TYPE
5771 given arguments of types ARG_TYPES.
5772 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
5773 are data type nodes for the arguments of the function.
5774 If such a type has already been constructed, reuse it. */
5777 build_function_type (tree value_type
, tree arg_types
)
5780 hashval_t hashcode
= 0;
5781 bool any_structural_p
, any_noncanonical_p
;
5782 tree canon_argtypes
;
5784 if (TREE_CODE (value_type
) == FUNCTION_TYPE
)
5786 error ("function return type cannot be function");
5787 value_type
= integer_type_node
;
5790 /* Make a node of the sort we want. */
5791 t
= make_node (FUNCTION_TYPE
);
5792 TREE_TYPE (t
) = value_type
;
5793 TYPE_ARG_TYPES (t
) = arg_types
;
5795 /* If we already have such a type, use the old one. */
5796 hashcode
= iterative_hash_object (TYPE_HASH (value_type
), hashcode
);
5797 hashcode
= type_hash_list (arg_types
, hashcode
);
5798 t
= type_hash_canon (hashcode
, t
);
5800 /* Set up the canonical type. */
5801 any_structural_p
= TYPE_STRUCTURAL_EQUALITY_P (value_type
);
5802 any_noncanonical_p
= TYPE_CANONICAL (value_type
) != value_type
;
5803 canon_argtypes
= maybe_canonicalize_argtypes (arg_types
,
5805 &any_noncanonical_p
);
5806 if (any_structural_p
)
5807 SET_TYPE_STRUCTURAL_EQUALITY (t
);
5808 else if (any_noncanonical_p
)
5809 TYPE_CANONICAL (t
) = build_function_type (TYPE_CANONICAL (value_type
),
5812 if (!COMPLETE_TYPE_P (t
))
5817 /* Build a function type. The RETURN_TYPE is the type returned by the
5818 function. If additional arguments are provided, they are
5819 additional argument types. The list of argument types must always
5820 be terminated by NULL_TREE. */
5823 build_function_type_list (tree return_type
, ...)
5828 va_start (p
, return_type
);
5830 t
= va_arg (p
, tree
);
5831 for (args
= NULL_TREE
; t
!= NULL_TREE
; t
= va_arg (p
, tree
))
5832 args
= tree_cons (NULL_TREE
, t
, args
);
5834 if (args
== NULL_TREE
)
5835 args
= void_list_node
;
5839 args
= nreverse (args
);
5840 TREE_CHAIN (last
) = void_list_node
;
5842 args
= build_function_type (return_type
, args
);
5848 /* Build a METHOD_TYPE for a member of BASETYPE. The RETTYPE (a TYPE)
5849 and ARGTYPES (a TREE_LIST) are the return type and arguments types
5850 for the method. An implicit additional parameter (of type
5851 pointer-to-BASETYPE) is added to the ARGTYPES. */
5854 build_method_type_directly (tree basetype
,
5861 bool any_structural_p
, any_noncanonical_p
;
5862 tree canon_argtypes
;
5864 /* Make a node of the sort we want. */
5865 t
= make_node (METHOD_TYPE
);
5867 TYPE_METHOD_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
5868 TREE_TYPE (t
) = rettype
;
5869 ptype
= build_pointer_type (basetype
);
5871 /* The actual arglist for this function includes a "hidden" argument
5872 which is "this". Put it into the list of argument types. */
5873 argtypes
= tree_cons (NULL_TREE
, ptype
, argtypes
);
5874 TYPE_ARG_TYPES (t
) = argtypes
;
5876 /* If we already have such a type, use the old one. */
5877 hashcode
= iterative_hash_object (TYPE_HASH (basetype
), hashcode
);
5878 hashcode
= iterative_hash_object (TYPE_HASH (rettype
), hashcode
);
5879 hashcode
= type_hash_list (argtypes
, hashcode
);
5880 t
= type_hash_canon (hashcode
, t
);
5882 /* Set up the canonical type. */
5884 = (TYPE_STRUCTURAL_EQUALITY_P (basetype
)
5885 || TYPE_STRUCTURAL_EQUALITY_P (rettype
));
5887 = (TYPE_CANONICAL (basetype
) != basetype
5888 || TYPE_CANONICAL (rettype
) != rettype
);
5889 canon_argtypes
= maybe_canonicalize_argtypes (TREE_CHAIN (argtypes
),
5891 &any_noncanonical_p
);
5892 if (any_structural_p
)
5893 SET_TYPE_STRUCTURAL_EQUALITY (t
);
5894 else if (any_noncanonical_p
)
5896 = build_method_type_directly (TYPE_CANONICAL (basetype
),
5897 TYPE_CANONICAL (rettype
),
5899 if (!COMPLETE_TYPE_P (t
))
5905 /* Construct, lay out and return the type of methods belonging to class
5906 BASETYPE and whose arguments and values are described by TYPE.
5907 If that type exists already, reuse it.
5908 TYPE must be a FUNCTION_TYPE node. */
5911 build_method_type (tree basetype
, tree type
)
5913 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
5915 return build_method_type_directly (basetype
,
5917 TYPE_ARG_TYPES (type
));
5920 /* Construct, lay out and return the type of offsets to a value
5921 of type TYPE, within an object of type BASETYPE.
5922 If a suitable offset type exists already, reuse it. */
5925 build_offset_type (tree basetype
, tree type
)
5928 hashval_t hashcode
= 0;
5930 /* Make a node of the sort we want. */
5931 t
= make_node (OFFSET_TYPE
);
5933 TYPE_OFFSET_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
5934 TREE_TYPE (t
) = type
;
5936 /* If we already have such a type, use the old one. */
5937 hashcode
= iterative_hash_object (TYPE_HASH (basetype
), hashcode
);
5938 hashcode
= iterative_hash_object (TYPE_HASH (type
), hashcode
);
5939 t
= type_hash_canon (hashcode
, t
);
5941 if (!COMPLETE_TYPE_P (t
))
5944 if (TYPE_CANONICAL (t
) == t
)
5946 if (TYPE_STRUCTURAL_EQUALITY_P (basetype
)
5947 || TYPE_STRUCTURAL_EQUALITY_P (type
))
5948 SET_TYPE_STRUCTURAL_EQUALITY (t
);
5949 else if (TYPE_CANONICAL (basetype
) != basetype
5950 || TYPE_CANONICAL (type
) != type
)
5952 = build_offset_type (TYPE_CANONICAL (basetype
),
5953 TYPE_CANONICAL (type
));
5959 /* Create a complex type whose components are COMPONENT_TYPE. */
5962 build_complex_type (tree component_type
)
5967 /* Make a node of the sort we want. */
5968 t
= make_node (COMPLEX_TYPE
);
5970 TREE_TYPE (t
) = TYPE_MAIN_VARIANT (component_type
);
5972 /* If we already have such a type, use the old one. */
5973 hashcode
= iterative_hash_object (TYPE_HASH (component_type
), 0);
5974 t
= type_hash_canon (hashcode
, t
);
5976 if (!COMPLETE_TYPE_P (t
))
5979 if (TYPE_CANONICAL (t
) == t
)
5981 if (TYPE_STRUCTURAL_EQUALITY_P (component_type
))
5982 SET_TYPE_STRUCTURAL_EQUALITY (t
);
5983 else if (TYPE_CANONICAL (component_type
) != component_type
)
5985 = build_complex_type (TYPE_CANONICAL (component_type
));
5988 /* If we are writing Dwarf2 output we need to create a name,
5989 since complex is a fundamental type. */
5990 if ((write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
5994 if (component_type
== char_type_node
)
5995 name
= "complex char";
5996 else if (component_type
== signed_char_type_node
)
5997 name
= "complex signed char";
5998 else if (component_type
== unsigned_char_type_node
)
5999 name
= "complex unsigned char";
6000 else if (component_type
== short_integer_type_node
)
6001 name
= "complex short int";
6002 else if (component_type
== short_unsigned_type_node
)
6003 name
= "complex short unsigned int";
6004 else if (component_type
== integer_type_node
)
6005 name
= "complex int";
6006 else if (component_type
== unsigned_type_node
)
6007 name
= "complex unsigned int";
6008 else if (component_type
== long_integer_type_node
)
6009 name
= "complex long int";
6010 else if (component_type
== long_unsigned_type_node
)
6011 name
= "complex long unsigned int";
6012 else if (component_type
== long_long_integer_type_node
)
6013 name
= "complex long long int";
6014 else if (component_type
== long_long_unsigned_type_node
)
6015 name
= "complex long long unsigned int";
6020 TYPE_NAME (t
) = build_decl (TYPE_DECL
, get_identifier (name
), t
);
6023 return build_qualified_type (t
, TYPE_QUALS (component_type
));
6026 /* Return OP, stripped of any conversions to wider types as much as is safe.
6027 Converting the value back to OP's type makes a value equivalent to OP.
6029 If FOR_TYPE is nonzero, we return a value which, if converted to
6030 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
6032 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
6033 narrowest type that can hold the value, even if they don't exactly fit.
6034 Otherwise, bit-field references are changed to a narrower type
6035 only if they can be fetched directly from memory in that type.
6037 OP must have integer, real or enumeral type. Pointers are not allowed!
6039 There are some cases where the obvious value we could return
6040 would regenerate to OP if converted to OP's type,
6041 but would not extend like OP to wider types.
6042 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
6043 For example, if OP is (unsigned short)(signed char)-1,
6044 we avoid returning (signed char)-1 if FOR_TYPE is int,
6045 even though extending that to an unsigned short would regenerate OP,
6046 since the result of extending (signed char)-1 to (int)
6047 is different from (int) OP. */
6050 get_unwidened (tree op
, tree for_type
)
6052 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
6053 tree type
= TREE_TYPE (op
);
6055 = TYPE_PRECISION (for_type
!= 0 ? for_type
: type
);
6057 = (for_type
!= 0 && for_type
!= type
6058 && final_prec
> TYPE_PRECISION (type
)
6059 && TYPE_UNSIGNED (type
));
6062 while (TREE_CODE (op
) == NOP_EXPR
6063 || TREE_CODE (op
) == CONVERT_EXPR
)
6067 /* TYPE_PRECISION on vector types has different meaning
6068 (TYPE_VECTOR_SUBPARTS) and casts from vectors are view conversions,
6069 so avoid them here. */
6070 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (op
, 0))) == VECTOR_TYPE
)
6073 bitschange
= TYPE_PRECISION (TREE_TYPE (op
))
6074 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0)));
6076 /* Truncations are many-one so cannot be removed.
6077 Unless we are later going to truncate down even farther. */
6079 && final_prec
> TYPE_PRECISION (TREE_TYPE (op
)))
6082 /* See what's inside this conversion. If we decide to strip it,
6084 op
= TREE_OPERAND (op
, 0);
6086 /* If we have not stripped any zero-extensions (uns is 0),
6087 we can strip any kind of extension.
6088 If we have previously stripped a zero-extension,
6089 only zero-extensions can safely be stripped.
6090 Any extension can be stripped if the bits it would produce
6091 are all going to be discarded later by truncating to FOR_TYPE. */
6095 if (! uns
|| final_prec
<= TYPE_PRECISION (TREE_TYPE (op
)))
6097 /* TYPE_UNSIGNED says whether this is a zero-extension.
6098 Let's avoid computing it if it does not affect WIN
6099 and if UNS will not be needed again. */
6101 || TREE_CODE (op
) == NOP_EXPR
6102 || TREE_CODE (op
) == CONVERT_EXPR
)
6103 && TYPE_UNSIGNED (TREE_TYPE (op
)))
6111 if (TREE_CODE (op
) == COMPONENT_REF
6112 /* Since type_for_size always gives an integer type. */
6113 && TREE_CODE (type
) != REAL_TYPE
6114 && TREE_CODE (type
) != FIXED_POINT_TYPE
6115 /* Don't crash if field not laid out yet. */
6116 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
6117 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
6119 unsigned int innerprec
6120 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
6121 int unsignedp
= (DECL_UNSIGNED (TREE_OPERAND (op
, 1))
6122 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op
, 1))));
6123 type
= lang_hooks
.types
.type_for_size (innerprec
, unsignedp
);
6125 /* We can get this structure field in the narrowest type it fits in.
6126 If FOR_TYPE is 0, do this only for a field that matches the
6127 narrower type exactly and is aligned for it
6128 The resulting extension to its nominal type (a fullword type)
6129 must fit the same conditions as for other extensions. */
6132 && INT_CST_LT_UNSIGNED (TYPE_SIZE (type
), TYPE_SIZE (TREE_TYPE (op
)))
6133 && (for_type
|| ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1)))
6134 && (! uns
|| final_prec
<= innerprec
|| unsignedp
))
6136 win
= build3 (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
6137 TREE_OPERAND (op
, 1), NULL_TREE
);
6138 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
6139 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
6146 /* Return OP or a simpler expression for a narrower value
6147 which can be sign-extended or zero-extended to give back OP.
6148 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
6149 or 0 if the value should be sign-extended. */
6152 get_narrower (tree op
, int *unsignedp_ptr
)
6157 bool integral_p
= INTEGRAL_TYPE_P (TREE_TYPE (op
));
6159 while (TREE_CODE (op
) == NOP_EXPR
)
6162 = (TYPE_PRECISION (TREE_TYPE (op
))
6163 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0))));
6165 /* Truncations are many-one so cannot be removed. */
6169 /* See what's inside this conversion. If we decide to strip it,
6174 op
= TREE_OPERAND (op
, 0);
6175 /* An extension: the outermost one can be stripped,
6176 but remember whether it is zero or sign extension. */
6178 uns
= TYPE_UNSIGNED (TREE_TYPE (op
));
6179 /* Otherwise, if a sign extension has been stripped,
6180 only sign extensions can now be stripped;
6181 if a zero extension has been stripped, only zero-extensions. */
6182 else if (uns
!= TYPE_UNSIGNED (TREE_TYPE (op
)))
6186 else /* bitschange == 0 */
6188 /* A change in nominal type can always be stripped, but we must
6189 preserve the unsignedness. */
6191 uns
= TYPE_UNSIGNED (TREE_TYPE (op
));
6193 op
= TREE_OPERAND (op
, 0);
6194 /* Keep trying to narrow, but don't assign op to win if it
6195 would turn an integral type into something else. */
6196 if (INTEGRAL_TYPE_P (TREE_TYPE (op
)) != integral_p
)
6203 if (TREE_CODE (op
) == COMPONENT_REF
6204 /* Since type_for_size always gives an integer type. */
6205 && TREE_CODE (TREE_TYPE (op
)) != REAL_TYPE
6206 && TREE_CODE (TREE_TYPE (op
)) != FIXED_POINT_TYPE
6207 /* Ensure field is laid out already. */
6208 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
6209 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
6211 unsigned HOST_WIDE_INT innerprec
6212 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
6213 int unsignedp
= (DECL_UNSIGNED (TREE_OPERAND (op
, 1))
6214 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op
, 1))));
6215 tree type
= lang_hooks
.types
.type_for_size (innerprec
, unsignedp
);
6217 /* We can get this structure field in a narrower type that fits it,
6218 but the resulting extension to its nominal type (a fullword type)
6219 must satisfy the same conditions as for other extensions.
6221 Do this only for fields that are aligned (not bit-fields),
6222 because when bit-field insns will be used there is no
6223 advantage in doing this. */
6225 if (innerprec
< TYPE_PRECISION (TREE_TYPE (op
))
6226 && ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1))
6227 && (first
|| uns
== DECL_UNSIGNED (TREE_OPERAND (op
, 1)))
6231 uns
= DECL_UNSIGNED (TREE_OPERAND (op
, 1));
6232 win
= fold_convert (type
, op
);
6236 *unsignedp_ptr
= uns
;
6240 /* Nonzero if integer constant C has a value that is permissible
6241 for type TYPE (an INTEGER_TYPE). */
6244 int_fits_type_p (const_tree c
, const_tree type
)
6246 tree type_low_bound
= TYPE_MIN_VALUE (type
);
6247 tree type_high_bound
= TYPE_MAX_VALUE (type
);
6248 bool ok_for_low_bound
, ok_for_high_bound
;
6249 unsigned HOST_WIDE_INT low
;
6252 /* If at least one bound of the type is a constant integer, we can check
6253 ourselves and maybe make a decision. If no such decision is possible, but
6254 this type is a subtype, try checking against that. Otherwise, use
6255 fit_double_type, which checks against the precision.
6257 Compute the status for each possibly constant bound, and return if we see
6258 one does not match. Use ok_for_xxx_bound for this purpose, assigning -1
6259 for "unknown if constant fits", 0 for "constant known *not* to fit" and 1
6260 for "constant known to fit". */
6262 /* Check if C >= type_low_bound. */
6263 if (type_low_bound
&& TREE_CODE (type_low_bound
) == INTEGER_CST
)
6265 if (tree_int_cst_lt (c
, type_low_bound
))
6267 ok_for_low_bound
= true;
6270 ok_for_low_bound
= false;
6272 /* Check if c <= type_high_bound. */
6273 if (type_high_bound
&& TREE_CODE (type_high_bound
) == INTEGER_CST
)
6275 if (tree_int_cst_lt (type_high_bound
, c
))
6277 ok_for_high_bound
= true;
6280 ok_for_high_bound
= false;
6282 /* If the constant fits both bounds, the result is known. */
6283 if (ok_for_low_bound
&& ok_for_high_bound
)
6286 /* Perform some generic filtering which may allow making a decision
6287 even if the bounds are not constant. First, negative integers
6288 never fit in unsigned types, */
6289 if (TYPE_UNSIGNED (type
) && tree_int_cst_sgn (c
) < 0)
6292 /* Second, narrower types always fit in wider ones. */
6293 if (TYPE_PRECISION (type
) > TYPE_PRECISION (TREE_TYPE (c
)))
6296 /* Third, unsigned integers with top bit set never fit signed types. */
6297 if (! TYPE_UNSIGNED (type
)
6298 && TYPE_UNSIGNED (TREE_TYPE (c
))
6299 && tree_int_cst_msb (c
))
6302 /* If we haven't been able to decide at this point, there nothing more we
6303 can check ourselves here. Look at the base type if we have one and it
6304 has the same precision. */
6305 if (TREE_CODE (type
) == INTEGER_TYPE
6306 && TREE_TYPE (type
) != 0
6307 && TYPE_PRECISION (type
) == TYPE_PRECISION (TREE_TYPE (type
)))
6308 return int_fits_type_p (c
, TREE_TYPE (type
));
6310 /* Or to fit_double_type, if nothing else. */
6311 low
= TREE_INT_CST_LOW (c
);
6312 high
= TREE_INT_CST_HIGH (c
);
6313 return !fit_double_type (low
, high
, &low
, &high
, type
);
6316 /* Stores bounds of an integer TYPE in MIN and MAX. If TYPE has non-constant
6317 bounds or is a POINTER_TYPE, the maximum and/or minimum values that can be
6318 represented (assuming two's-complement arithmetic) within the bit
6319 precision of the type are returned instead. */
6322 get_type_static_bounds (tree type
, mpz_t min
, mpz_t max
)
6324 if (!POINTER_TYPE_P (type
) && TYPE_MIN_VALUE (type
)
6325 && TREE_CODE (TYPE_MIN_VALUE (type
)) == INTEGER_CST
)
6326 mpz_set_double_int (min
, tree_to_double_int (TYPE_MIN_VALUE (type
)),
6327 TYPE_UNSIGNED (type
));
6330 if (TYPE_UNSIGNED (type
))
6331 mpz_set_ui (min
, 0);
6335 mn
= double_int_mask (TYPE_PRECISION (type
) - 1);
6336 mn
= double_int_sext (double_int_add (mn
, double_int_one
),
6337 TYPE_PRECISION (type
));
6338 mpz_set_double_int (min
, mn
, false);
6342 if (!POINTER_TYPE_P (type
) && TYPE_MAX_VALUE (type
)
6343 && TREE_CODE (TYPE_MAX_VALUE (type
)) == INTEGER_CST
)
6344 mpz_set_double_int (max
, tree_to_double_int (TYPE_MAX_VALUE (type
)),
6345 TYPE_UNSIGNED (type
));
6348 if (TYPE_UNSIGNED (type
))
6349 mpz_set_double_int (max
, double_int_mask (TYPE_PRECISION (type
)),
6352 mpz_set_double_int (max
, double_int_mask (TYPE_PRECISION (type
) - 1),
6357 /* Subprogram of following function. Called by walk_tree.
6359 Return *TP if it is an automatic variable or parameter of the
6360 function passed in as DATA. */
6363 find_var_from_fn (tree
*tp
, int *walk_subtrees
, void *data
)
6365 tree fn
= (tree
) data
;
6370 else if (DECL_P (*tp
)
6371 && lang_hooks
.tree_inlining
.auto_var_in_fn_p (*tp
, fn
))
6377 /* Returns true if T is, contains, or refers to a type with variable
6378 size. For METHOD_TYPEs and FUNCTION_TYPEs we exclude the
6379 arguments, but not the return type. If FN is nonzero, only return
6380 true if a modifier of the type or position of FN is a variable or
6381 parameter inside FN.
6383 This concept is more general than that of C99 'variably modified types':
6384 in C99, a struct type is never variably modified because a VLA may not
6385 appear as a structure member. However, in GNU C code like:
6387 struct S { int i[f()]; };
6389 is valid, and other languages may define similar constructs. */
6392 variably_modified_type_p (tree type
, tree fn
)
6396 /* Test if T is either variable (if FN is zero) or an expression containing
6397 a variable in FN. */
6398 #define RETURN_TRUE_IF_VAR(T) \
6399 do { tree _t = (T); \
6400 if (_t && _t != error_mark_node && TREE_CODE (_t) != INTEGER_CST \
6401 && (!fn || walk_tree (&_t, find_var_from_fn, fn, NULL))) \
6402 return true; } while (0)
6404 if (type
== error_mark_node
)
6407 /* If TYPE itself has variable size, it is variably modified. */
6408 RETURN_TRUE_IF_VAR (TYPE_SIZE (type
));
6409 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT (type
));
6411 switch (TREE_CODE (type
))
6414 case REFERENCE_TYPE
:
6416 if (variably_modified_type_p (TREE_TYPE (type
), fn
))
6422 /* If TYPE is a function type, it is variably modified if the
6423 return type is variably modified. */
6424 if (variably_modified_type_p (TREE_TYPE (type
), fn
))
6430 case FIXED_POINT_TYPE
:
6433 /* Scalar types are variably modified if their end points
6435 RETURN_TRUE_IF_VAR (TYPE_MIN_VALUE (type
));
6436 RETURN_TRUE_IF_VAR (TYPE_MAX_VALUE (type
));
6441 case QUAL_UNION_TYPE
:
6442 /* We can't see if any of the fields are variably-modified by the
6443 definition we normally use, since that would produce infinite
6444 recursion via pointers. */
6445 /* This is variably modified if some field's type is. */
6446 for (t
= TYPE_FIELDS (type
); t
; t
= TREE_CHAIN (t
))
6447 if (TREE_CODE (t
) == FIELD_DECL
)
6449 RETURN_TRUE_IF_VAR (DECL_FIELD_OFFSET (t
));
6450 RETURN_TRUE_IF_VAR (DECL_SIZE (t
));
6451 RETURN_TRUE_IF_VAR (DECL_SIZE_UNIT (t
));
6453 if (TREE_CODE (type
) == QUAL_UNION_TYPE
)
6454 RETURN_TRUE_IF_VAR (DECL_QUALIFIER (t
));
6459 /* Do not call ourselves to avoid infinite recursion. This is
6460 variably modified if the element type is. */
6461 RETURN_TRUE_IF_VAR (TYPE_SIZE (TREE_TYPE (type
)));
6462 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT (TREE_TYPE (type
)));
6469 /* The current language may have other cases to check, but in general,
6470 all other types are not variably modified. */
6471 return lang_hooks
.tree_inlining
.var_mod_type_p (type
, fn
);
6473 #undef RETURN_TRUE_IF_VAR
6476 /* Given a DECL or TYPE, return the scope in which it was declared, or
6477 NULL_TREE if there is no containing scope. */
6480 get_containing_scope (const_tree t
)
6482 return (TYPE_P (t
) ? TYPE_CONTEXT (t
) : DECL_CONTEXT (t
));
6485 /* Return the innermost context enclosing DECL that is
6486 a FUNCTION_DECL, or zero if none. */
6489 decl_function_context (const_tree decl
)
6493 if (TREE_CODE (decl
) == ERROR_MARK
)
6496 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
6497 where we look up the function at runtime. Such functions always take
6498 a first argument of type 'pointer to real context'.
6500 C++ should really be fixed to use DECL_CONTEXT for the real context,
6501 and use something else for the "virtual context". */
6502 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_VINDEX (decl
))
6505 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl
)))));
6507 context
= DECL_CONTEXT (decl
);
6509 while (context
&& TREE_CODE (context
) != FUNCTION_DECL
)
6511 if (TREE_CODE (context
) == BLOCK
)
6512 context
= BLOCK_SUPERCONTEXT (context
);
6514 context
= get_containing_scope (context
);
6520 /* Return the innermost context enclosing DECL that is
6521 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
6522 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
6525 decl_type_context (const_tree decl
)
6527 tree context
= DECL_CONTEXT (decl
);
6530 switch (TREE_CODE (context
))
6532 case NAMESPACE_DECL
:
6533 case TRANSLATION_UNIT_DECL
:
6538 case QUAL_UNION_TYPE
:
6543 context
= DECL_CONTEXT (context
);
6547 context
= BLOCK_SUPERCONTEXT (context
);
6557 /* CALL is a CALL_EXPR. Return the declaration for the function
6558 called, or NULL_TREE if the called function cannot be
6562 get_callee_fndecl (const_tree call
)
6566 if (call
== error_mark_node
)
6567 return error_mark_node
;
6569 /* It's invalid to call this function with anything but a
6571 gcc_assert (TREE_CODE (call
) == CALL_EXPR
);
6573 /* The first operand to the CALL is the address of the function
6575 addr
= CALL_EXPR_FN (call
);
6579 /* If this is a readonly function pointer, extract its initial value. */
6580 if (DECL_P (addr
) && TREE_CODE (addr
) != FUNCTION_DECL
6581 && TREE_READONLY (addr
) && ! TREE_THIS_VOLATILE (addr
)
6582 && DECL_INITIAL (addr
))
6583 addr
= DECL_INITIAL (addr
);
6585 /* If the address is just `&f' for some function `f', then we know
6586 that `f' is being called. */
6587 if (TREE_CODE (addr
) == ADDR_EXPR
6588 && TREE_CODE (TREE_OPERAND (addr
, 0)) == FUNCTION_DECL
)
6589 return TREE_OPERAND (addr
, 0);
6591 /* We couldn't figure out what was being called. Maybe the front
6592 end has some idea. */
6593 return lang_hooks
.lang_get_callee_fndecl (call
);
6596 /* Print debugging information about tree nodes generated during the compile,
6597 and any language-specific information. */
6600 dump_tree_statistics (void)
6602 #ifdef GATHER_STATISTICS
6604 int total_nodes
, total_bytes
;
6607 fprintf (stderr
, "\n??? tree nodes created\n\n");
6608 #ifdef GATHER_STATISTICS
6609 fprintf (stderr
, "Kind Nodes Bytes\n");
6610 fprintf (stderr
, "---------------------------------------\n");
6611 total_nodes
= total_bytes
= 0;
6612 for (i
= 0; i
< (int) all_kinds
; i
++)
6614 fprintf (stderr
, "%-20s %7d %10d\n", tree_node_kind_names
[i
],
6615 tree_node_counts
[i
], tree_node_sizes
[i
]);
6616 total_nodes
+= tree_node_counts
[i
];
6617 total_bytes
+= tree_node_sizes
[i
];
6619 fprintf (stderr
, "---------------------------------------\n");
6620 fprintf (stderr
, "%-20s %7d %10d\n", "Total", total_nodes
, total_bytes
);
6621 fprintf (stderr
, "---------------------------------------\n");
6622 ssanames_print_statistics ();
6623 phinodes_print_statistics ();
6625 fprintf (stderr
, "(No per-node statistics)\n");
6627 print_type_hash_statistics ();
6628 print_debug_expr_statistics ();
6629 print_value_expr_statistics ();
6630 print_restrict_base_statistics ();
6631 lang_hooks
.print_statistics ();
6634 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
6636 /* Generate a crc32 of a string. */
6639 crc32_string (unsigned chksum
, const char *string
)
6643 unsigned value
= *string
<< 24;
6646 for (ix
= 8; ix
--; value
<<= 1)
6650 feedback
= (value
^ chksum
) & 0x80000000 ? 0x04c11db7 : 0;
6659 /* P is a string that will be used in a symbol. Mask out any characters
6660 that are not valid in that context. */
6663 clean_symbol_name (char *p
)
6667 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
6670 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
6677 /* Generate a name for a special-purpose function function.
6678 The generated name may need to be unique across the whole link.
6679 TYPE is some string to identify the purpose of this function to the
6680 linker or collect2; it must start with an uppercase letter,
6682 I - for constructors
6684 N - for C++ anonymous namespaces
6685 F - for DWARF unwind frame information. */
6688 get_file_function_name (const char *type
)
6694 /* If we already have a name we know to be unique, just use that. */
6695 if (first_global_object_name
)
6696 p
= first_global_object_name
;
6697 /* If the target is handling the constructors/destructors, they
6698 will be local to this file and the name is only necessary for
6699 debugging purposes. */
6700 else if ((type
[0] == 'I' || type
[0] == 'D') && targetm
.have_ctors_dtors
)
6702 const char *file
= main_input_filename
;
6704 file
= input_filename
;
6705 /* Just use the file's basename, because the full pathname
6706 might be quite long. */
6707 p
= strrchr (file
, '/');
6712 p
= q
= ASTRDUP (p
);
6713 clean_symbol_name (q
);
6717 /* Otherwise, the name must be unique across the entire link.
6718 We don't have anything that we know to be unique to this translation
6719 unit, so use what we do have and throw in some randomness. */
6721 const char *name
= weak_global_object_name
;
6722 const char *file
= main_input_filename
;
6727 file
= input_filename
;
6729 len
= strlen (file
);
6730 q
= alloca (9 * 2 + len
+ 1);
6731 memcpy (q
, file
, len
+ 1);
6732 clean_symbol_name (q
);
6734 sprintf (q
+ len
, "_%08X_%08X", crc32_string (0, name
),
6735 crc32_string (0, get_random_seed (false)));
6740 buf
= alloca (sizeof (FILE_FUNCTION_FORMAT
) + strlen (p
) + strlen (type
));
6742 /* Set up the name of the file-level functions we may need.
6743 Use a global object (which is already required to be unique over
6744 the program) rather than the file name (which imposes extra
6746 sprintf (buf
, FILE_FUNCTION_FORMAT
, type
, p
);
6748 return get_identifier (buf
);
6751 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
6753 /* Complain that the tree code of NODE does not match the expected 0
6754 terminated list of trailing codes. The trailing code list can be
6755 empty, for a more vague error message. FILE, LINE, and FUNCTION
6756 are of the caller. */
6759 tree_check_failed (const_tree node
, const char *file
,
6760 int line
, const char *function
, ...)
6764 unsigned length
= 0;
6767 va_start (args
, function
);
6768 while ((code
= va_arg (args
, int)))
6769 length
+= 4 + strlen (tree_code_name
[code
]);
6774 va_start (args
, function
);
6775 length
+= strlen ("expected ");
6776 buffer
= tmp
= alloca (length
);
6778 while ((code
= va_arg (args
, int)))
6780 const char *prefix
= length
? " or " : "expected ";
6782 strcpy (tmp
+ length
, prefix
);
6783 length
+= strlen (prefix
);
6784 strcpy (tmp
+ length
, tree_code_name
[code
]);
6785 length
+= strlen (tree_code_name
[code
]);
6790 buffer
= "unexpected node";
6792 internal_error ("tree check: %s, have %s in %s, at %s:%d",
6793 buffer
, tree_code_name
[TREE_CODE (node
)],
6794 function
, trim_filename (file
), line
);
6797 /* Complain that the tree code of NODE does match the expected 0
6798 terminated list of trailing codes. FILE, LINE, and FUNCTION are of
6802 tree_not_check_failed (const_tree node
, const char *file
,
6803 int line
, const char *function
, ...)
6807 unsigned length
= 0;
6810 va_start (args
, function
);
6811 while ((code
= va_arg (args
, int)))
6812 length
+= 4 + strlen (tree_code_name
[code
]);
6814 va_start (args
, function
);
6815 buffer
= alloca (length
);
6817 while ((code
= va_arg (args
, int)))
6821 strcpy (buffer
+ length
, " or ");
6824 strcpy (buffer
+ length
, tree_code_name
[code
]);
6825 length
+= strlen (tree_code_name
[code
]);
6829 internal_error ("tree check: expected none of %s, have %s in %s, at %s:%d",
6830 buffer
, tree_code_name
[TREE_CODE (node
)],
6831 function
, trim_filename (file
), line
);
6834 /* Similar to tree_check_failed, except that we check for a class of tree
6835 code, given in CL. */
6838 tree_class_check_failed (const_tree node
, const enum tree_code_class cl
,
6839 const char *file
, int line
, const char *function
)
6842 ("tree check: expected class %qs, have %qs (%s) in %s, at %s:%d",
6843 TREE_CODE_CLASS_STRING (cl
),
6844 TREE_CODE_CLASS_STRING (TREE_CODE_CLASS (TREE_CODE (node
))),
6845 tree_code_name
[TREE_CODE (node
)], function
, trim_filename (file
), line
);
6848 /* Similar to tree_check_failed, except that instead of specifying a
6849 dozen codes, use the knowledge that they're all sequential. */
6852 tree_range_check_failed (const_tree node
, const char *file
, int line
,
6853 const char *function
, enum tree_code c1
,
6857 unsigned length
= 0;
6860 for (c
= c1
; c
<= c2
; ++c
)
6861 length
+= 4 + strlen (tree_code_name
[c
]);
6863 length
+= strlen ("expected ");
6864 buffer
= alloca (length
);
6867 for (c
= c1
; c
<= c2
; ++c
)
6869 const char *prefix
= length
? " or " : "expected ";
6871 strcpy (buffer
+ length
, prefix
);
6872 length
+= strlen (prefix
);
6873 strcpy (buffer
+ length
, tree_code_name
[c
]);
6874 length
+= strlen (tree_code_name
[c
]);
6877 internal_error ("tree check: %s, have %s in %s, at %s:%d",
6878 buffer
, tree_code_name
[TREE_CODE (node
)],
6879 function
, trim_filename (file
), line
);
6883 /* Similar to tree_check_failed, except that we check that a tree does
6884 not have the specified code, given in CL. */
6887 tree_not_class_check_failed (const_tree node
, const enum tree_code_class cl
,
6888 const char *file
, int line
, const char *function
)
6891 ("tree check: did not expect class %qs, have %qs (%s) in %s, at %s:%d",
6892 TREE_CODE_CLASS_STRING (cl
),
6893 TREE_CODE_CLASS_STRING (TREE_CODE_CLASS (TREE_CODE (node
))),
6894 tree_code_name
[TREE_CODE (node
)], function
, trim_filename (file
), line
);
6898 /* Similar to tree_check_failed but applied to OMP_CLAUSE codes. */
6901 omp_clause_check_failed (const_tree node
, const char *file
, int line
,
6902 const char *function
, enum omp_clause_code code
)
6904 internal_error ("tree check: expected omp_clause %s, have %s in %s, at %s:%d",
6905 omp_clause_code_name
[code
], tree_code_name
[TREE_CODE (node
)],
6906 function
, trim_filename (file
), line
);
6910 /* Similar to tree_range_check_failed but applied to OMP_CLAUSE codes. */
6913 omp_clause_range_check_failed (const_tree node
, const char *file
, int line
,
6914 const char *function
, enum omp_clause_code c1
,
6915 enum omp_clause_code c2
)
6918 unsigned length
= 0;
6919 enum omp_clause_code c
;
6921 for (c
= c1
; c
<= c2
; ++c
)
6922 length
+= 4 + strlen (omp_clause_code_name
[c
]);
6924 length
+= strlen ("expected ");
6925 buffer
= alloca (length
);
6928 for (c
= c1
; c
<= c2
; ++c
)
6930 const char *prefix
= length
? " or " : "expected ";
6932 strcpy (buffer
+ length
, prefix
);
6933 length
+= strlen (prefix
);
6934 strcpy (buffer
+ length
, omp_clause_code_name
[c
]);
6935 length
+= strlen (omp_clause_code_name
[c
]);
6938 internal_error ("tree check: %s, have %s in %s, at %s:%d",
6939 buffer
, omp_clause_code_name
[TREE_CODE (node
)],
6940 function
, trim_filename (file
), line
);
6944 #undef DEFTREESTRUCT
6945 #define DEFTREESTRUCT(VAL, NAME) NAME,
6947 static const char *ts_enum_names
[] = {
6948 #include "treestruct.def"
6950 #undef DEFTREESTRUCT
6952 #define TS_ENUM_NAME(EN) (ts_enum_names[(EN)])
6954 /* Similar to tree_class_check_failed, except that we check for
6955 whether CODE contains the tree structure identified by EN. */
6958 tree_contains_struct_check_failed (const_tree node
,
6959 const enum tree_node_structure_enum en
,
6960 const char *file
, int line
,
6961 const char *function
)
6964 ("tree check: expected tree that contains %qs structure, have %qs in %s, at %s:%d",
6966 tree_code_name
[TREE_CODE (node
)], function
, trim_filename (file
), line
);
6970 /* Similar to above, except that the check is for the bounds of a TREE_VEC's
6971 (dynamically sized) vector. */
6974 tree_vec_elt_check_failed (int idx
, int len
, const char *file
, int line
,
6975 const char *function
)
6978 ("tree check: accessed elt %d of tree_vec with %d elts in %s, at %s:%d",
6979 idx
+ 1, len
, function
, trim_filename (file
), line
);
6982 /* Similar to above, except that the check is for the bounds of a PHI_NODE's
6983 (dynamically sized) vector. */
6986 phi_node_elt_check_failed (int idx
, int len
, const char *file
, int line
,
6987 const char *function
)
6990 ("tree check: accessed elt %d of phi_node with %d elts in %s, at %s:%d",
6991 idx
+ 1, len
, function
, trim_filename (file
), line
);
6994 /* Similar to above, except that the check is for the bounds of the operand
6995 vector of an expression node EXP. */
6998 tree_operand_check_failed (int idx
, const_tree exp
, const char *file
,
6999 int line
, const char *function
)
7001 int code
= TREE_CODE (exp
);
7003 ("tree check: accessed operand %d of %s with %d operands in %s, at %s:%d",
7004 idx
+ 1, tree_code_name
[code
], TREE_OPERAND_LENGTH (exp
),
7005 function
, trim_filename (file
), line
);
7008 /* Similar to above, except that the check is for the number of
7009 operands of an OMP_CLAUSE node. */
7012 omp_clause_operand_check_failed (int idx
, const_tree t
, const char *file
,
7013 int line
, const char *function
)
7016 ("tree check: accessed operand %d of omp_clause %s with %d operands "
7017 "in %s, at %s:%d", idx
+ 1, omp_clause_code_name
[OMP_CLAUSE_CODE (t
)],
7018 omp_clause_num_ops
[OMP_CLAUSE_CODE (t
)], function
,
7019 trim_filename (file
), line
);
7021 #endif /* ENABLE_TREE_CHECKING */
7023 /* Create a new vector type node holding SUBPARTS units of type INNERTYPE,
7024 and mapped to the machine mode MODE. Initialize its fields and build
7025 the information necessary for debugging output. */
7028 make_vector_type (tree innertype
, int nunits
, enum machine_mode mode
)
7031 hashval_t hashcode
= 0;
7033 /* Build a main variant, based on the main variant of the inner type, then
7034 use it to build the variant we return. */
7035 if ((TYPE_ATTRIBUTES (innertype
) || TYPE_QUALS (innertype
))
7036 && TYPE_MAIN_VARIANT (innertype
) != innertype
)
7037 return build_type_attribute_qual_variant (
7038 make_vector_type (TYPE_MAIN_VARIANT (innertype
), nunits
, mode
),
7039 TYPE_ATTRIBUTES (innertype
),
7040 TYPE_QUALS (innertype
));
7042 t
= make_node (VECTOR_TYPE
);
7043 TREE_TYPE (t
) = TYPE_MAIN_VARIANT (innertype
);
7044 SET_TYPE_VECTOR_SUBPARTS (t
, nunits
);
7045 TYPE_MODE (t
) = mode
;
7046 TYPE_READONLY (t
) = TYPE_READONLY (innertype
);
7047 TYPE_VOLATILE (t
) = TYPE_VOLATILE (innertype
);
7049 if (TYPE_STRUCTURAL_EQUALITY_P (innertype
))
7050 SET_TYPE_STRUCTURAL_EQUALITY (t
);
7051 else if (TYPE_CANONICAL (innertype
) != innertype
7052 || mode
!= VOIDmode
)
7054 = make_vector_type (TYPE_CANONICAL (innertype
), nunits
, VOIDmode
);
7059 tree index
= build_int_cst (NULL_TREE
, nunits
- 1);
7060 tree array
= build_array_type (innertype
, build_index_type (index
));
7061 tree rt
= make_node (RECORD_TYPE
);
7063 TYPE_FIELDS (rt
) = build_decl (FIELD_DECL
, get_identifier ("f"), array
);
7064 DECL_CONTEXT (TYPE_FIELDS (rt
)) = rt
;
7066 TYPE_DEBUG_REPRESENTATION_TYPE (t
) = rt
;
7067 /* In dwarfout.c, type lookup uses TYPE_UID numbers. We want to output
7068 the representation type, and we want to find that die when looking up
7069 the vector type. This is most easily achieved by making the TYPE_UID
7071 TYPE_UID (rt
) = TYPE_UID (t
);
7074 hashcode
= iterative_hash_host_wide_int (VECTOR_TYPE
, hashcode
);
7075 hashcode
= iterative_hash_host_wide_int (mode
, hashcode
);
7076 hashcode
= iterative_hash_object (TYPE_HASH (innertype
), hashcode
);
7077 return type_hash_canon (hashcode
, t
);
7081 make_or_reuse_type (unsigned size
, int unsignedp
)
7083 if (size
== INT_TYPE_SIZE
)
7084 return unsignedp
? unsigned_type_node
: integer_type_node
;
7085 if (size
== CHAR_TYPE_SIZE
)
7086 return unsignedp
? unsigned_char_type_node
: signed_char_type_node
;
7087 if (size
== SHORT_TYPE_SIZE
)
7088 return unsignedp
? short_unsigned_type_node
: short_integer_type_node
;
7089 if (size
== LONG_TYPE_SIZE
)
7090 return unsignedp
? long_unsigned_type_node
: long_integer_type_node
;
7091 if (size
== LONG_LONG_TYPE_SIZE
)
7092 return (unsignedp
? long_long_unsigned_type_node
7093 : long_long_integer_type_node
);
7096 return make_unsigned_type (size
);
7098 return make_signed_type (size
);
7101 /* Create or reuse a fract type by SIZE, UNSIGNEDP, and SATP. */
7104 make_or_reuse_fract_type (unsigned size
, int unsignedp
, int satp
)
7108 if (size
== SHORT_FRACT_TYPE_SIZE
)
7109 return unsignedp
? sat_unsigned_short_fract_type_node
7110 : sat_short_fract_type_node
;
7111 if (size
== FRACT_TYPE_SIZE
)
7112 return unsignedp
? sat_unsigned_fract_type_node
: sat_fract_type_node
;
7113 if (size
== LONG_FRACT_TYPE_SIZE
)
7114 return unsignedp
? sat_unsigned_long_fract_type_node
7115 : sat_long_fract_type_node
;
7116 if (size
== LONG_LONG_FRACT_TYPE_SIZE
)
7117 return unsignedp
? sat_unsigned_long_long_fract_type_node
7118 : sat_long_long_fract_type_node
;
7122 if (size
== SHORT_FRACT_TYPE_SIZE
)
7123 return unsignedp
? unsigned_short_fract_type_node
7124 : short_fract_type_node
;
7125 if (size
== FRACT_TYPE_SIZE
)
7126 return unsignedp
? unsigned_fract_type_node
: fract_type_node
;
7127 if (size
== LONG_FRACT_TYPE_SIZE
)
7128 return unsignedp
? unsigned_long_fract_type_node
7129 : long_fract_type_node
;
7130 if (size
== LONG_LONG_FRACT_TYPE_SIZE
)
7131 return unsignedp
? unsigned_long_long_fract_type_node
7132 : long_long_fract_type_node
;
7135 return make_fract_type (size
, unsignedp
, satp
);
7138 /* Create or reuse an accum type by SIZE, UNSIGNEDP, and SATP. */
7141 make_or_reuse_accum_type (unsigned size
, int unsignedp
, int satp
)
7145 if (size
== SHORT_ACCUM_TYPE_SIZE
)
7146 return unsignedp
? sat_unsigned_short_accum_type_node
7147 : sat_short_accum_type_node
;
7148 if (size
== ACCUM_TYPE_SIZE
)
7149 return unsignedp
? sat_unsigned_accum_type_node
: sat_accum_type_node
;
7150 if (size
== LONG_ACCUM_TYPE_SIZE
)
7151 return unsignedp
? sat_unsigned_long_accum_type_node
7152 : sat_long_accum_type_node
;
7153 if (size
== LONG_LONG_ACCUM_TYPE_SIZE
)
7154 return unsignedp
? sat_unsigned_long_long_accum_type_node
7155 : sat_long_long_accum_type_node
;
7159 if (size
== SHORT_ACCUM_TYPE_SIZE
)
7160 return unsignedp
? unsigned_short_accum_type_node
7161 : short_accum_type_node
;
7162 if (size
== ACCUM_TYPE_SIZE
)
7163 return unsignedp
? unsigned_accum_type_node
: accum_type_node
;
7164 if (size
== LONG_ACCUM_TYPE_SIZE
)
7165 return unsignedp
? unsigned_long_accum_type_node
7166 : long_accum_type_node
;
7167 if (size
== LONG_LONG_ACCUM_TYPE_SIZE
)
7168 return unsignedp
? unsigned_long_long_accum_type_node
7169 : long_long_accum_type_node
;
7172 return make_accum_type (size
, unsignedp
, satp
);
7175 /* Create nodes for all integer types (and error_mark_node) using the sizes
7176 of C datatypes. The caller should call set_sizetype soon after calling
7177 this function to select one of the types as sizetype. */
7180 build_common_tree_nodes (bool signed_char
, bool signed_sizetype
)
7182 error_mark_node
= make_node (ERROR_MARK
);
7183 TREE_TYPE (error_mark_node
) = error_mark_node
;
7185 initialize_sizetypes (signed_sizetype
);
7187 /* Define both `signed char' and `unsigned char'. */
7188 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
7189 TYPE_STRING_FLAG (signed_char_type_node
) = 1;
7190 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
7191 TYPE_STRING_FLAG (unsigned_char_type_node
) = 1;
7193 /* Define `char', which is like either `signed char' or `unsigned char'
7194 but not the same as either. */
7197 ? make_signed_type (CHAR_TYPE_SIZE
)
7198 : make_unsigned_type (CHAR_TYPE_SIZE
));
7199 TYPE_STRING_FLAG (char_type_node
) = 1;
7201 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
7202 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
7203 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
7204 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
7205 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
7206 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
7207 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
7208 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
7210 /* Define a boolean type. This type only represents boolean values but
7211 may be larger than char depending on the value of BOOL_TYPE_SIZE.
7212 Front ends which want to override this size (i.e. Java) can redefine
7213 boolean_type_node before calling build_common_tree_nodes_2. */
7214 boolean_type_node
= make_unsigned_type (BOOL_TYPE_SIZE
);
7215 TREE_SET_CODE (boolean_type_node
, BOOLEAN_TYPE
);
7216 TYPE_MAX_VALUE (boolean_type_node
) = build_int_cst (boolean_type_node
, 1);
7217 TYPE_PRECISION (boolean_type_node
) = 1;
7219 /* Fill in the rest of the sized types. Reuse existing type nodes
7221 intQI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (QImode
), 0);
7222 intHI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (HImode
), 0);
7223 intSI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (SImode
), 0);
7224 intDI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (DImode
), 0);
7225 intTI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (TImode
), 0);
7227 unsigned_intQI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (QImode
), 1);
7228 unsigned_intHI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (HImode
), 1);
7229 unsigned_intSI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (SImode
), 1);
7230 unsigned_intDI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (DImode
), 1);
7231 unsigned_intTI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (TImode
), 1);
7233 access_public_node
= get_identifier ("public");
7234 access_protected_node
= get_identifier ("protected");
7235 access_private_node
= get_identifier ("private");
7238 /* Call this function after calling build_common_tree_nodes and set_sizetype.
7239 It will create several other common tree nodes. */
7242 build_common_tree_nodes_2 (int short_double
)
7244 /* Define these next since types below may used them. */
7245 integer_zero_node
= build_int_cst (NULL_TREE
, 0);
7246 integer_one_node
= build_int_cst (NULL_TREE
, 1);
7247 integer_minus_one_node
= build_int_cst (NULL_TREE
, -1);
7249 size_zero_node
= size_int (0);
7250 size_one_node
= size_int (1);
7251 bitsize_zero_node
= bitsize_int (0);
7252 bitsize_one_node
= bitsize_int (1);
7253 bitsize_unit_node
= bitsize_int (BITS_PER_UNIT
);
7255 boolean_false_node
= TYPE_MIN_VALUE (boolean_type_node
);
7256 boolean_true_node
= TYPE_MAX_VALUE (boolean_type_node
);
7258 void_type_node
= make_node (VOID_TYPE
);
7259 layout_type (void_type_node
);
7261 /* We are not going to have real types in C with less than byte alignment,
7262 so we might as well not have any types that claim to have it. */
7263 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
7264 TYPE_USER_ALIGN (void_type_node
) = 0;
7266 null_pointer_node
= build_int_cst (build_pointer_type (void_type_node
), 0);
7267 layout_type (TREE_TYPE (null_pointer_node
));
7269 ptr_type_node
= build_pointer_type (void_type_node
);
7271 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
7272 fileptr_type_node
= ptr_type_node
;
7274 float_type_node
= make_node (REAL_TYPE
);
7275 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
7276 layout_type (float_type_node
);
7278 double_type_node
= make_node (REAL_TYPE
);
7280 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
7282 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
7283 layout_type (double_type_node
);
7285 long_double_type_node
= make_node (REAL_TYPE
);
7286 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
7287 layout_type (long_double_type_node
);
7289 float_ptr_type_node
= build_pointer_type (float_type_node
);
7290 double_ptr_type_node
= build_pointer_type (double_type_node
);
7291 long_double_ptr_type_node
= build_pointer_type (long_double_type_node
);
7292 integer_ptr_type_node
= build_pointer_type (integer_type_node
);
7294 /* Fixed size integer types. */
7295 uint32_type_node
= build_nonstandard_integer_type (32, true);
7296 uint64_type_node
= build_nonstandard_integer_type (64, true);
7298 /* Decimal float types. */
7299 dfloat32_type_node
= make_node (REAL_TYPE
);
7300 TYPE_PRECISION (dfloat32_type_node
) = DECIMAL32_TYPE_SIZE
;
7301 layout_type (dfloat32_type_node
);
7302 TYPE_MODE (dfloat32_type_node
) = SDmode
;
7303 dfloat32_ptr_type_node
= build_pointer_type (dfloat32_type_node
);
7305 dfloat64_type_node
= make_node (REAL_TYPE
);
7306 TYPE_PRECISION (dfloat64_type_node
) = DECIMAL64_TYPE_SIZE
;
7307 layout_type (dfloat64_type_node
);
7308 TYPE_MODE (dfloat64_type_node
) = DDmode
;
7309 dfloat64_ptr_type_node
= build_pointer_type (dfloat64_type_node
);
7311 dfloat128_type_node
= make_node (REAL_TYPE
);
7312 TYPE_PRECISION (dfloat128_type_node
) = DECIMAL128_TYPE_SIZE
;
7313 layout_type (dfloat128_type_node
);
7314 TYPE_MODE (dfloat128_type_node
) = TDmode
;
7315 dfloat128_ptr_type_node
= build_pointer_type (dfloat128_type_node
);
7317 complex_integer_type_node
= build_complex_type (integer_type_node
);
7318 complex_float_type_node
= build_complex_type (float_type_node
);
7319 complex_double_type_node
= build_complex_type (double_type_node
);
7320 complex_long_double_type_node
= build_complex_type (long_double_type_node
);
7322 /* Make fixed-point nodes based on sat/non-sat and signed/unsigned. */
7323 #define MAKE_FIXED_TYPE_NODE(KIND,WIDTH,SIZE) \
7324 sat_ ## WIDTH ## KIND ## _type_node = \
7325 make_sat_signed_ ## KIND ## _type (SIZE); \
7326 sat_unsigned_ ## WIDTH ## KIND ## _type_node = \
7327 make_sat_unsigned_ ## KIND ## _type (SIZE); \
7328 WIDTH ## KIND ## _type_node = make_signed_ ## KIND ## _type (SIZE); \
7329 unsigned_ ## WIDTH ## KIND ## _type_node = \
7330 make_unsigned_ ## KIND ## _type (SIZE);
7332 /* Make fixed-point type nodes based on four different widths. */
7333 #define MAKE_FIXED_TYPE_NODE_FAMILY(N1,N2) \
7334 MAKE_FIXED_TYPE_NODE (N1, short_, SHORT_ ## N2 ## _TYPE_SIZE) \
7335 MAKE_FIXED_TYPE_NODE (N1, , N2 ## _TYPE_SIZE) \
7336 MAKE_FIXED_TYPE_NODE (N1, long_, LONG_ ## N2 ## _TYPE_SIZE) \
7337 MAKE_FIXED_TYPE_NODE (N1, long_long_, LONG_LONG_ ## N2 ## _TYPE_SIZE)
7339 /* Make fixed-point mode nodes based on sat/non-sat and signed/unsigned. */
7340 #define MAKE_FIXED_MODE_NODE(KIND,NAME,MODE) \
7341 NAME ## _type_node = \
7342 make_or_reuse_signed_ ## KIND ## _type (GET_MODE_BITSIZE (MODE ## mode)); \
7343 u ## NAME ## _type_node = \
7344 make_or_reuse_unsigned_ ## KIND ## _type \
7345 (GET_MODE_BITSIZE (U ## MODE ## mode)); \
7346 sat_ ## NAME ## _type_node = \
7347 make_or_reuse_sat_signed_ ## KIND ## _type \
7348 (GET_MODE_BITSIZE (MODE ## mode)); \
7349 sat_u ## NAME ## _type_node = \
7350 make_or_reuse_sat_unsigned_ ## KIND ## _type \
7351 (GET_MODE_BITSIZE (U ## MODE ## mode));
7353 /* Fixed-point type and mode nodes. */
7354 MAKE_FIXED_TYPE_NODE_FAMILY (fract
, FRACT
)
7355 MAKE_FIXED_TYPE_NODE_FAMILY (accum
, ACCUM
)
7356 MAKE_FIXED_MODE_NODE (fract
, qq
, QQ
)
7357 MAKE_FIXED_MODE_NODE (fract
, hq
, HQ
)
7358 MAKE_FIXED_MODE_NODE (fract
, sq
, SQ
)
7359 MAKE_FIXED_MODE_NODE (fract
, dq
, DQ
)
7360 MAKE_FIXED_MODE_NODE (fract
, tq
, TQ
)
7361 MAKE_FIXED_MODE_NODE (accum
, ha
, HA
)
7362 MAKE_FIXED_MODE_NODE (accum
, sa
, SA
)
7363 MAKE_FIXED_MODE_NODE (accum
, da
, DA
)
7364 MAKE_FIXED_MODE_NODE (accum
, ta
, TA
)
7367 tree t
= targetm
.build_builtin_va_list ();
7369 /* Many back-ends define record types without setting TYPE_NAME.
7370 If we copied the record type here, we'd keep the original
7371 record type without a name. This breaks name mangling. So,
7372 don't copy record types and let c_common_nodes_and_builtins()
7373 declare the type to be __builtin_va_list. */
7374 if (TREE_CODE (t
) != RECORD_TYPE
)
7375 t
= build_variant_type_copy (t
);
7377 va_list_type_node
= t
;
7381 /* A subroutine of build_common_builtin_nodes. Define a builtin function. */
7384 local_define_builtin (const char *name
, tree type
, enum built_in_function code
,
7385 const char *library_name
, int ecf_flags
)
7389 decl
= add_builtin_function (name
, type
, code
, BUILT_IN_NORMAL
,
7390 library_name
, NULL_TREE
);
7391 if (ecf_flags
& ECF_CONST
)
7392 TREE_READONLY (decl
) = 1;
7393 if (ecf_flags
& ECF_PURE
)
7394 DECL_IS_PURE (decl
) = 1;
7395 if (ecf_flags
& ECF_NORETURN
)
7396 TREE_THIS_VOLATILE (decl
) = 1;
7397 if (ecf_flags
& ECF_NOTHROW
)
7398 TREE_NOTHROW (decl
) = 1;
7399 if (ecf_flags
& ECF_MALLOC
)
7400 DECL_IS_MALLOC (decl
) = 1;
7402 built_in_decls
[code
] = decl
;
7403 implicit_built_in_decls
[code
] = decl
;
7406 /* Call this function after instantiating all builtins that the language
7407 front end cares about. This will build the rest of the builtins that
7408 are relied upon by the tree optimizers and the middle-end. */
7411 build_common_builtin_nodes (void)
7415 if (built_in_decls
[BUILT_IN_MEMCPY
] == NULL
7416 || built_in_decls
[BUILT_IN_MEMMOVE
] == NULL
)
7418 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
7419 tmp
= tree_cons (NULL_TREE
, const_ptr_type_node
, tmp
);
7420 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
7421 ftype
= build_function_type (ptr_type_node
, tmp
);
7423 if (built_in_decls
[BUILT_IN_MEMCPY
] == NULL
)
7424 local_define_builtin ("__builtin_memcpy", ftype
, BUILT_IN_MEMCPY
,
7425 "memcpy", ECF_NOTHROW
);
7426 if (built_in_decls
[BUILT_IN_MEMMOVE
] == NULL
)
7427 local_define_builtin ("__builtin_memmove", ftype
, BUILT_IN_MEMMOVE
,
7428 "memmove", ECF_NOTHROW
);
7431 if (built_in_decls
[BUILT_IN_MEMCMP
] == NULL
)
7433 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
7434 tmp
= tree_cons (NULL_TREE
, const_ptr_type_node
, tmp
);
7435 tmp
= tree_cons (NULL_TREE
, const_ptr_type_node
, tmp
);
7436 ftype
= build_function_type (integer_type_node
, tmp
);
7437 local_define_builtin ("__builtin_memcmp", ftype
, BUILT_IN_MEMCMP
,
7438 "memcmp", ECF_PURE
| ECF_NOTHROW
);
7441 if (built_in_decls
[BUILT_IN_MEMSET
] == NULL
)
7443 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
7444 tmp
= tree_cons (NULL_TREE
, integer_type_node
, tmp
);
7445 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
7446 ftype
= build_function_type (ptr_type_node
, tmp
);
7447 local_define_builtin ("__builtin_memset", ftype
, BUILT_IN_MEMSET
,
7448 "memset", ECF_NOTHROW
);
7451 if (built_in_decls
[BUILT_IN_ALLOCA
] == NULL
)
7453 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
7454 ftype
= build_function_type (ptr_type_node
, tmp
);
7455 local_define_builtin ("__builtin_alloca", ftype
, BUILT_IN_ALLOCA
,
7456 "alloca", ECF_NOTHROW
| ECF_MALLOC
);
7459 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
7460 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
7461 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
7462 ftype
= build_function_type (void_type_node
, tmp
);
7463 local_define_builtin ("__builtin_init_trampoline", ftype
,
7464 BUILT_IN_INIT_TRAMPOLINE
,
7465 "__builtin_init_trampoline", ECF_NOTHROW
);
7467 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
7468 ftype
= build_function_type (ptr_type_node
, tmp
);
7469 local_define_builtin ("__builtin_adjust_trampoline", ftype
,
7470 BUILT_IN_ADJUST_TRAMPOLINE
,
7471 "__builtin_adjust_trampoline",
7472 ECF_CONST
| ECF_NOTHROW
);
7474 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
7475 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
7476 ftype
= build_function_type (void_type_node
, tmp
);
7477 local_define_builtin ("__builtin_nonlocal_goto", ftype
,
7478 BUILT_IN_NONLOCAL_GOTO
,
7479 "__builtin_nonlocal_goto",
7480 ECF_NORETURN
| ECF_NOTHROW
);
7482 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
7483 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
7484 ftype
= build_function_type (void_type_node
, tmp
);
7485 local_define_builtin ("__builtin_setjmp_setup", ftype
,
7486 BUILT_IN_SETJMP_SETUP
,
7487 "__builtin_setjmp_setup", ECF_NOTHROW
);
7489 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
7490 ftype
= build_function_type (ptr_type_node
, tmp
);
7491 local_define_builtin ("__builtin_setjmp_dispatcher", ftype
,
7492 BUILT_IN_SETJMP_DISPATCHER
,
7493 "__builtin_setjmp_dispatcher",
7494 ECF_PURE
| ECF_NOTHROW
);
7496 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
7497 ftype
= build_function_type (void_type_node
, tmp
);
7498 local_define_builtin ("__builtin_setjmp_receiver", ftype
,
7499 BUILT_IN_SETJMP_RECEIVER
,
7500 "__builtin_setjmp_receiver", ECF_NOTHROW
);
7502 ftype
= build_function_type (ptr_type_node
, void_list_node
);
7503 local_define_builtin ("__builtin_stack_save", ftype
, BUILT_IN_STACK_SAVE
,
7504 "__builtin_stack_save", ECF_NOTHROW
);
7506 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
7507 ftype
= build_function_type (void_type_node
, tmp
);
7508 local_define_builtin ("__builtin_stack_restore", ftype
,
7509 BUILT_IN_STACK_RESTORE
,
7510 "__builtin_stack_restore", ECF_NOTHROW
);
7512 ftype
= build_function_type (void_type_node
, void_list_node
);
7513 local_define_builtin ("__builtin_profile_func_enter", ftype
,
7514 BUILT_IN_PROFILE_FUNC_ENTER
, "profile_func_enter", 0);
7515 local_define_builtin ("__builtin_profile_func_exit", ftype
,
7516 BUILT_IN_PROFILE_FUNC_EXIT
, "profile_func_exit", 0);
7518 /* Complex multiplication and division. These are handled as builtins
7519 rather than optabs because emit_library_call_value doesn't support
7520 complex. Further, we can do slightly better with folding these
7521 beasties if the real and complex parts of the arguments are separate. */
7523 enum machine_mode mode
;
7525 for (mode
= MIN_MODE_COMPLEX_FLOAT
; mode
<= MAX_MODE_COMPLEX_FLOAT
; ++mode
)
7527 char mode_name_buf
[4], *q
;
7529 enum built_in_function mcode
, dcode
;
7530 tree type
, inner_type
;
7532 type
= lang_hooks
.types
.type_for_mode (mode
, 0);
7535 inner_type
= TREE_TYPE (type
);
7537 tmp
= tree_cons (NULL_TREE
, inner_type
, void_list_node
);
7538 tmp
= tree_cons (NULL_TREE
, inner_type
, tmp
);
7539 tmp
= tree_cons (NULL_TREE
, inner_type
, tmp
);
7540 tmp
= tree_cons (NULL_TREE
, inner_type
, tmp
);
7541 ftype
= build_function_type (type
, tmp
);
7543 mcode
= BUILT_IN_COMPLEX_MUL_MIN
+ mode
- MIN_MODE_COMPLEX_FLOAT
;
7544 dcode
= BUILT_IN_COMPLEX_DIV_MIN
+ mode
- MIN_MODE_COMPLEX_FLOAT
;
7546 for (p
= GET_MODE_NAME (mode
), q
= mode_name_buf
; *p
; p
++, q
++)
7550 built_in_names
[mcode
] = concat ("__mul", mode_name_buf
, "3", NULL
);
7551 local_define_builtin (built_in_names
[mcode
], ftype
, mcode
,
7552 built_in_names
[mcode
], ECF_CONST
| ECF_NOTHROW
);
7554 built_in_names
[dcode
] = concat ("__div", mode_name_buf
, "3", NULL
);
7555 local_define_builtin (built_in_names
[dcode
], ftype
, dcode
,
7556 built_in_names
[dcode
], ECF_CONST
| ECF_NOTHROW
);
7561 /* HACK. GROSS. This is absolutely disgusting. I wish there was a
7564 If we requested a pointer to a vector, build up the pointers that
7565 we stripped off while looking for the inner type. Similarly for
7566 return values from functions.
7568 The argument TYPE is the top of the chain, and BOTTOM is the
7569 new type which we will point to. */
7572 reconstruct_complex_type (tree type
, tree bottom
)
7576 if (TREE_CODE (type
) == POINTER_TYPE
)
7578 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
7579 outer
= build_pointer_type_for_mode (inner
, TYPE_MODE (type
),
7580 TYPE_REF_CAN_ALIAS_ALL (type
));
7582 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
7584 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
7585 outer
= build_reference_type_for_mode (inner
, TYPE_MODE (type
),
7586 TYPE_REF_CAN_ALIAS_ALL (type
));
7588 else if (TREE_CODE (type
) == ARRAY_TYPE
)
7590 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
7591 outer
= build_array_type (inner
, TYPE_DOMAIN (type
));
7593 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
7595 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
7596 outer
= build_function_type (inner
, TYPE_ARG_TYPES (type
));
7598 else if (TREE_CODE (type
) == METHOD_TYPE
)
7600 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
7601 /* The build_method_type_directly() routine prepends 'this' to argument list,
7602 so we must compensate by getting rid of it. */
7604 = build_method_type_directly
7605 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (type
))),
7607 TREE_CHAIN (TYPE_ARG_TYPES (type
)));
7612 TYPE_READONLY (outer
) = TYPE_READONLY (type
);
7613 TYPE_VOLATILE (outer
) = TYPE_VOLATILE (type
);
7618 /* Returns a vector tree node given a mode (integer, vector, or BLKmode) and
7621 build_vector_type_for_mode (tree innertype
, enum machine_mode mode
)
7625 switch (GET_MODE_CLASS (mode
))
7627 case MODE_VECTOR_INT
:
7628 case MODE_VECTOR_FLOAT
:
7629 case MODE_VECTOR_FRACT
:
7630 case MODE_VECTOR_UFRACT
:
7631 case MODE_VECTOR_ACCUM
:
7632 case MODE_VECTOR_UACCUM
:
7633 nunits
= GET_MODE_NUNITS (mode
);
7637 /* Check that there are no leftover bits. */
7638 gcc_assert (GET_MODE_BITSIZE (mode
)
7639 % TREE_INT_CST_LOW (TYPE_SIZE (innertype
)) == 0);
7641 nunits
= GET_MODE_BITSIZE (mode
)
7642 / TREE_INT_CST_LOW (TYPE_SIZE (innertype
));
7649 return make_vector_type (innertype
, nunits
, mode
);
7652 /* Similarly, but takes the inner type and number of units, which must be
7656 build_vector_type (tree innertype
, int nunits
)
7658 return make_vector_type (innertype
, nunits
, VOIDmode
);
7662 /* Build RESX_EXPR with given REGION_NUMBER. */
7664 build_resx (int region_number
)
7667 t
= build1 (RESX_EXPR
, void_type_node
,
7668 build_int_cst (NULL_TREE
, region_number
));
7672 /* Given an initializer INIT, return TRUE if INIT is zero or some
7673 aggregate of zeros. Otherwise return FALSE. */
7675 initializer_zerop (const_tree init
)
7681 switch (TREE_CODE (init
))
7684 return integer_zerop (init
);
7687 /* ??? Note that this is not correct for C4X float formats. There,
7688 a bit pattern of all zeros is 1.0; 0.0 is encoded with the most
7689 negative exponent. */
7690 return real_zerop (init
)
7691 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (init
));
7694 return fixed_zerop (init
);
7697 return integer_zerop (init
)
7698 || (real_zerop (init
)
7699 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_REALPART (init
)))
7700 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_IMAGPART (init
))));
7703 for (elt
= TREE_VECTOR_CST_ELTS (init
); elt
; elt
= TREE_CHAIN (elt
))
7704 if (!initializer_zerop (TREE_VALUE (elt
)))
7710 unsigned HOST_WIDE_INT idx
;
7712 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (init
), idx
, elt
)
7713 if (!initializer_zerop (elt
))
7723 /* Build an empty statement. */
7726 build_empty_stmt (void)
7728 return build1 (NOP_EXPR
, void_type_node
, size_zero_node
);
7732 /* Build an OpenMP clause with code CODE. */
7735 build_omp_clause (enum omp_clause_code code
)
7740 length
= omp_clause_num_ops
[code
];
7741 size
= (sizeof (struct tree_omp_clause
) + (length
- 1) * sizeof (tree
));
7743 t
= ggc_alloc (size
);
7744 memset (t
, 0, size
);
7745 TREE_SET_CODE (t
, OMP_CLAUSE
);
7746 OMP_CLAUSE_SET_CODE (t
, code
);
7748 #ifdef GATHER_STATISTICS
7749 tree_node_counts
[(int) omp_clause_kind
]++;
7750 tree_node_sizes
[(int) omp_clause_kind
] += size
;
7756 /* Set various status flags when building a CALL_EXPR object T. */
7759 process_call_operands (tree t
)
7763 side_effects
= TREE_SIDE_EFFECTS (t
);
7767 n
= TREE_OPERAND_LENGTH (t
);
7768 for (i
= 1; i
< n
; i
++)
7770 tree op
= TREE_OPERAND (t
, i
);
7771 if (op
&& TREE_SIDE_EFFECTS (op
))
7782 /* Calls have side-effects, except those to const or
7784 i
= call_expr_flags (t
);
7785 if (!(i
& (ECF_CONST
| ECF_PURE
)))
7788 TREE_SIDE_EFFECTS (t
) = side_effects
;
7791 /* Build a tcc_vl_exp object with code CODE and room for LEN operands. LEN
7792 includes the implicit operand count in TREE_OPERAND 0, and so must be >= 1.
7793 Except for the CODE and operand count field, other storage for the
7794 object is initialized to zeros. */
7797 build_vl_exp_stat (enum tree_code code
, int len MEM_STAT_DECL
)
7800 int length
= (len
- 1) * sizeof (tree
) + sizeof (struct tree_exp
);
7802 gcc_assert (TREE_CODE_CLASS (code
) == tcc_vl_exp
);
7803 gcc_assert (len
>= 1);
7805 #ifdef GATHER_STATISTICS
7806 tree_node_counts
[(int) e_kind
]++;
7807 tree_node_sizes
[(int) e_kind
] += length
;
7810 t
= ggc_alloc_zone_pass_stat (length
, &tree_zone
);
7812 memset (t
, 0, length
);
7814 TREE_SET_CODE (t
, code
);
7816 /* Can't use TREE_OPERAND to store the length because if checking is
7817 enabled, it will try to check the length before we store it. :-P */
7818 t
->exp
.operands
[0] = build_int_cst (sizetype
, len
);
7824 /* Build a CALL_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE
7825 and FN and a null static chain slot. ARGLIST is a TREE_LIST of the
7829 build_call_list (tree return_type
, tree fn
, tree arglist
)
7834 t
= build_vl_exp (CALL_EXPR
, list_length (arglist
) + 3);
7835 TREE_TYPE (t
) = return_type
;
7836 CALL_EXPR_FN (t
) = fn
;
7837 CALL_EXPR_STATIC_CHAIN (t
) = NULL_TREE
;
7838 for (i
= 0; arglist
; arglist
= TREE_CHAIN (arglist
), i
++)
7839 CALL_EXPR_ARG (t
, i
) = TREE_VALUE (arglist
);
7840 process_call_operands (t
);
7844 /* Build a CALL_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE and
7845 FN and a null static chain slot. NARGS is the number of call arguments
7846 which are specified as "..." arguments. */
7849 build_call_nary (tree return_type
, tree fn
, int nargs
, ...)
7853 va_start (args
, nargs
);
7854 ret
= build_call_valist (return_type
, fn
, nargs
, args
);
7859 /* Build a CALL_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE and
7860 FN and a null static chain slot. NARGS is the number of call arguments
7861 which are specified as a va_list ARGS. */
7864 build_call_valist (tree return_type
, tree fn
, int nargs
, va_list args
)
7869 t
= build_vl_exp (CALL_EXPR
, nargs
+ 3);
7870 TREE_TYPE (t
) = return_type
;
7871 CALL_EXPR_FN (t
) = fn
;
7872 CALL_EXPR_STATIC_CHAIN (t
) = NULL_TREE
;
7873 for (i
= 0; i
< nargs
; i
++)
7874 CALL_EXPR_ARG (t
, i
) = va_arg (args
, tree
);
7875 process_call_operands (t
);
7879 /* Build a CALL_EXPR of class tcc_vl_exp with the indicated RETURN_TYPE and
7880 FN and a null static chain slot. NARGS is the number of call arguments
7881 which are specified as a tree array ARGS. */
7884 build_call_array (tree return_type
, tree fn
, int nargs
, tree
*args
)
7889 t
= build_vl_exp (CALL_EXPR
, nargs
+ 3);
7890 TREE_TYPE (t
) = return_type
;
7891 CALL_EXPR_FN (t
) = fn
;
7892 CALL_EXPR_STATIC_CHAIN (t
) = NULL_TREE
;
7893 for (i
= 0; i
< nargs
; i
++)
7894 CALL_EXPR_ARG (t
, i
) = args
[i
];
7895 process_call_operands (t
);
7900 /* Returns true if it is possible to prove that the index of
7901 an array access REF (an ARRAY_REF expression) falls into the
7905 in_array_bounds_p (tree ref
)
7907 tree idx
= TREE_OPERAND (ref
, 1);
7910 if (TREE_CODE (idx
) != INTEGER_CST
)
7913 min
= array_ref_low_bound (ref
);
7914 max
= array_ref_up_bound (ref
);
7917 || TREE_CODE (min
) != INTEGER_CST
7918 || TREE_CODE (max
) != INTEGER_CST
)
7921 if (tree_int_cst_lt (idx
, min
)
7922 || tree_int_cst_lt (max
, idx
))
7928 /* Returns true if it is possible to prove that the range of
7929 an array access REF (an ARRAY_RANGE_REF expression) falls
7930 into the array bounds. */
7933 range_in_array_bounds_p (tree ref
)
7935 tree domain_type
= TYPE_DOMAIN (TREE_TYPE (ref
));
7936 tree range_min
, range_max
, min
, max
;
7938 range_min
= TYPE_MIN_VALUE (domain_type
);
7939 range_max
= TYPE_MAX_VALUE (domain_type
);
7942 || TREE_CODE (range_min
) != INTEGER_CST
7943 || TREE_CODE (range_max
) != INTEGER_CST
)
7946 min
= array_ref_low_bound (ref
);
7947 max
= array_ref_up_bound (ref
);
7950 || TREE_CODE (min
) != INTEGER_CST
7951 || TREE_CODE (max
) != INTEGER_CST
)
7954 if (tree_int_cst_lt (range_min
, min
)
7955 || tree_int_cst_lt (max
, range_max
))
7961 /* Return true if T (assumed to be a DECL) must be assigned a memory
7965 needs_to_live_in_memory (tree t
)
7967 if (TREE_CODE (t
) == SSA_NAME
)
7968 t
= SSA_NAME_VAR (t
);
7970 return (TREE_ADDRESSABLE (t
)
7971 || is_global_var (t
)
7972 || (TREE_CODE (t
) == RESULT_DECL
7973 && aggregate_value_p (t
, current_function_decl
)));
7976 /* There are situations in which a language considers record types
7977 compatible which have different field lists. Decide if two fields
7978 are compatible. It is assumed that the parent records are compatible. */
7981 fields_compatible_p (const_tree f1
, const_tree f2
)
7983 if (!operand_equal_p (DECL_FIELD_BIT_OFFSET (f1
),
7984 DECL_FIELD_BIT_OFFSET (f2
), OEP_ONLY_CONST
))
7987 if (!operand_equal_p (DECL_FIELD_OFFSET (f1
),
7988 DECL_FIELD_OFFSET (f2
), OEP_ONLY_CONST
))
7991 if (!types_compatible_p (TREE_TYPE (f1
), TREE_TYPE (f2
)))
7997 /* Locate within RECORD a field that is compatible with ORIG_FIELD. */
8000 find_compatible_field (tree record
, tree orig_field
)
8004 for (f
= TYPE_FIELDS (record
); f
; f
= TREE_CHAIN (f
))
8005 if (TREE_CODE (f
) == FIELD_DECL
8006 && fields_compatible_p (f
, orig_field
))
8009 /* ??? Why isn't this on the main fields list? */
8010 f
= TYPE_VFIELD (record
);
8011 if (f
&& TREE_CODE (f
) == FIELD_DECL
8012 && fields_compatible_p (f
, orig_field
))
8015 /* ??? We should abort here, but Java appears to do Bad Things
8016 with inherited fields. */
8020 /* Return value of a constant X. */
8023 int_cst_value (const_tree x
)
8025 unsigned bits
= TYPE_PRECISION (TREE_TYPE (x
));
8026 unsigned HOST_WIDE_INT val
= TREE_INT_CST_LOW (x
);
8027 bool negative
= ((val
>> (bits
- 1)) & 1) != 0;
8029 gcc_assert (bits
<= HOST_BITS_PER_WIDE_INT
);
8032 val
|= (~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1) << 1;
8034 val
&= ~((~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1) << 1);
8039 /* If TYPE is an integral type, return an equivalent type which is
8040 unsigned iff UNSIGNEDP is true. If TYPE is not an integral type,
8041 return TYPE itself. */
8044 signed_or_unsigned_type_for (int unsignedp
, tree type
)
8047 if (POINTER_TYPE_P (type
))
8050 if (!INTEGRAL_TYPE_P (t
) || TYPE_UNSIGNED (t
) == unsignedp
)
8053 return lang_hooks
.types
.type_for_size (TYPE_PRECISION (t
), unsignedp
);
8056 /* Returns unsigned variant of TYPE. */
8059 unsigned_type_for (tree type
)
8061 return signed_or_unsigned_type_for (1, type
);
8064 /* Returns signed variant of TYPE. */
8067 signed_type_for (tree type
)
8069 return signed_or_unsigned_type_for (0, type
);
8072 /* Returns the largest value obtainable by casting something in INNER type to
8076 upper_bound_in_type (tree outer
, tree inner
)
8078 unsigned HOST_WIDE_INT lo
, hi
;
8079 unsigned int det
= 0;
8080 unsigned oprec
= TYPE_PRECISION (outer
);
8081 unsigned iprec
= TYPE_PRECISION (inner
);
8084 /* Compute a unique number for every combination. */
8085 det
|= (oprec
> iprec
) ? 4 : 0;
8086 det
|= TYPE_UNSIGNED (outer
) ? 2 : 0;
8087 det
|= TYPE_UNSIGNED (inner
) ? 1 : 0;
8089 /* Determine the exponent to use. */
8094 /* oprec <= iprec, outer: signed, inner: don't care. */
8099 /* oprec <= iprec, outer: unsigned, inner: don't care. */
8103 /* oprec > iprec, outer: signed, inner: signed. */
8107 /* oprec > iprec, outer: signed, inner: unsigned. */
8111 /* oprec > iprec, outer: unsigned, inner: signed. */
8115 /* oprec > iprec, outer: unsigned, inner: unsigned. */
8122 /* Compute 2^^prec - 1. */
8123 if (prec
<= HOST_BITS_PER_WIDE_INT
)
8126 lo
= ((~(unsigned HOST_WIDE_INT
) 0)
8127 >> (HOST_BITS_PER_WIDE_INT
- prec
));
8131 hi
= ((~(unsigned HOST_WIDE_INT
) 0)
8132 >> (2 * HOST_BITS_PER_WIDE_INT
- prec
));
8133 lo
= ~(unsigned HOST_WIDE_INT
) 0;
8136 return build_int_cst_wide (outer
, lo
, hi
);
8139 /* Returns the smallest value obtainable by casting something in INNER type to
8143 lower_bound_in_type (tree outer
, tree inner
)
8145 unsigned HOST_WIDE_INT lo
, hi
;
8146 unsigned oprec
= TYPE_PRECISION (outer
);
8147 unsigned iprec
= TYPE_PRECISION (inner
);
8149 /* If OUTER type is unsigned, we can definitely cast 0 to OUTER type
8151 if (TYPE_UNSIGNED (outer
)
8152 /* If we are widening something of an unsigned type, OUTER type
8153 contains all values of INNER type. In particular, both INNER
8154 and OUTER types have zero in common. */
8155 || (oprec
> iprec
&& TYPE_UNSIGNED (inner
)))
8159 /* If we are widening a signed type to another signed type, we
8160 want to obtain -2^^(iprec-1). If we are keeping the
8161 precision or narrowing to a signed type, we want to obtain
8163 unsigned prec
= oprec
> iprec
? iprec
: oprec
;
8165 if (prec
<= HOST_BITS_PER_WIDE_INT
)
8167 hi
= ~(unsigned HOST_WIDE_INT
) 0;
8168 lo
= (~(unsigned HOST_WIDE_INT
) 0) << (prec
- 1);
8172 hi
= ((~(unsigned HOST_WIDE_INT
) 0)
8173 << (prec
- HOST_BITS_PER_WIDE_INT
- 1));
8178 return build_int_cst_wide (outer
, lo
, hi
);
8181 /* Return nonzero if two operands that are suitable for PHI nodes are
8182 necessarily equal. Specifically, both ARG0 and ARG1 must be either
8183 SSA_NAME or invariant. Note that this is strictly an optimization.
8184 That is, callers of this function can directly call operand_equal_p
8185 and get the same result, only slower. */
8188 operand_equal_for_phi_arg_p (const_tree arg0
, const_tree arg1
)
8192 if (TREE_CODE (arg0
) == SSA_NAME
|| TREE_CODE (arg1
) == SSA_NAME
)
8194 return operand_equal_p (arg0
, arg1
, 0);
8197 /* Returns number of zeros at the end of binary representation of X.
8199 ??? Use ffs if available? */
8202 num_ending_zeros (const_tree x
)
8204 unsigned HOST_WIDE_INT fr
, nfr
;
8205 unsigned num
, abits
;
8206 tree type
= TREE_TYPE (x
);
8208 if (TREE_INT_CST_LOW (x
) == 0)
8210 num
= HOST_BITS_PER_WIDE_INT
;
8211 fr
= TREE_INT_CST_HIGH (x
);
8216 fr
= TREE_INT_CST_LOW (x
);
8219 for (abits
= HOST_BITS_PER_WIDE_INT
/ 2; abits
; abits
/= 2)
8222 if (nfr
<< abits
== fr
)
8229 if (num
> TYPE_PRECISION (type
))
8230 num
= TYPE_PRECISION (type
);
8232 return build_int_cst_type (type
, num
);
8236 #define WALK_SUBTREE(NODE) \
8239 result = walk_tree (&(NODE), func, data, pset); \
8245 /* This is a subroutine of walk_tree that walks field of TYPE that are to
8246 be walked whenever a type is seen in the tree. Rest of operands and return
8247 value are as for walk_tree. */
8250 walk_type_fields (tree type
, walk_tree_fn func
, void *data
,
8251 struct pointer_set_t
*pset
)
8253 tree result
= NULL_TREE
;
8255 switch (TREE_CODE (type
))
8258 case REFERENCE_TYPE
:
8259 /* We have to worry about mutually recursive pointers. These can't
8260 be written in C. They can in Ada. It's pathological, but
8261 there's an ACATS test (c38102a) that checks it. Deal with this
8262 by checking if we're pointing to another pointer, that one
8263 points to another pointer, that one does too, and we have no htab.
8264 If so, get a hash table. We check three levels deep to avoid
8265 the cost of the hash table if we don't need one. */
8266 if (POINTER_TYPE_P (TREE_TYPE (type
))
8267 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (type
)))
8268 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (TREE_TYPE (type
))))
8271 result
= walk_tree_without_duplicates (&TREE_TYPE (type
),
8279 /* ... fall through ... */
8282 WALK_SUBTREE (TREE_TYPE (type
));
8286 WALK_SUBTREE (TYPE_METHOD_BASETYPE (type
));
8291 WALK_SUBTREE (TREE_TYPE (type
));
8295 /* We never want to walk into default arguments. */
8296 for (arg
= TYPE_ARG_TYPES (type
); arg
; arg
= TREE_CHAIN (arg
))
8297 WALK_SUBTREE (TREE_VALUE (arg
));
8302 /* Don't follow this nodes's type if a pointer for fear that
8303 we'll have infinite recursion. If we have a PSET, then we
8306 || (!POINTER_TYPE_P (TREE_TYPE (type
))
8307 && TREE_CODE (TREE_TYPE (type
)) != OFFSET_TYPE
))
8308 WALK_SUBTREE (TREE_TYPE (type
));
8309 WALK_SUBTREE (TYPE_DOMAIN (type
));
8313 WALK_SUBTREE (TREE_TYPE (type
));
8314 WALK_SUBTREE (TYPE_OFFSET_BASETYPE (type
));
8324 /* Apply FUNC to all the sub-trees of TP in a pre-order traversal. FUNC is
8325 called with the DATA and the address of each sub-tree. If FUNC returns a
8326 non-NULL value, the traversal is stopped, and the value returned by FUNC
8327 is returned. If PSET is non-NULL it is used to record the nodes visited,
8328 and to avoid visiting a node more than once. */
8331 walk_tree (tree
*tp
, walk_tree_fn func
, void *data
, struct pointer_set_t
*pset
)
8333 enum tree_code code
;
8337 #define WALK_SUBTREE_TAIL(NODE) \
8341 goto tail_recurse; \
8346 /* Skip empty subtrees. */
8350 /* Don't walk the same tree twice, if the user has requested
8351 that we avoid doing so. */
8352 if (pset
&& pointer_set_insert (pset
, *tp
))
8355 /* Call the function. */
8357 result
= (*func
) (tp
, &walk_subtrees
, data
);
8359 /* If we found something, return it. */
8363 code
= TREE_CODE (*tp
);
8365 /* Even if we didn't, FUNC may have decided that there was nothing
8366 interesting below this point in the tree. */
8369 /* But we still need to check our siblings. */
8370 if (code
== TREE_LIST
)
8371 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp
));
8372 else if (code
== OMP_CLAUSE
)
8373 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp
));
8378 result
= lang_hooks
.tree_inlining
.walk_subtrees (tp
, &walk_subtrees
, func
,
8380 if (result
|| !walk_subtrees
)
8386 case IDENTIFIER_NODE
:
8393 case PLACEHOLDER_EXPR
:
8397 /* None of these have subtrees other than those already walked
8402 WALK_SUBTREE (TREE_VALUE (*tp
));
8403 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp
));
8408 int len
= TREE_VEC_LENGTH (*tp
);
8413 /* Walk all elements but the first. */
8415 WALK_SUBTREE (TREE_VEC_ELT (*tp
, len
));
8417 /* Now walk the first one as a tail call. */
8418 WALK_SUBTREE_TAIL (TREE_VEC_ELT (*tp
, 0));
8422 WALK_SUBTREE (TREE_REALPART (*tp
));
8423 WALK_SUBTREE_TAIL (TREE_IMAGPART (*tp
));
8427 unsigned HOST_WIDE_INT idx
;
8428 constructor_elt
*ce
;
8431 VEC_iterate(constructor_elt
, CONSTRUCTOR_ELTS (*tp
), idx
, ce
);
8433 WALK_SUBTREE (ce
->value
);
8438 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp
, 0));
8443 for (decl
= BIND_EXPR_VARS (*tp
); decl
; decl
= TREE_CHAIN (decl
))
8445 /* Walk the DECL_INITIAL and DECL_SIZE. We don't want to walk
8446 into declarations that are just mentioned, rather than
8447 declared; they don't really belong to this part of the tree.
8448 And, we can see cycles: the initializer for a declaration
8449 can refer to the declaration itself. */
8450 WALK_SUBTREE (DECL_INITIAL (decl
));
8451 WALK_SUBTREE (DECL_SIZE (decl
));
8452 WALK_SUBTREE (DECL_SIZE_UNIT (decl
));
8454 WALK_SUBTREE_TAIL (BIND_EXPR_BODY (*tp
));
8457 case STATEMENT_LIST
:
8459 tree_stmt_iterator i
;
8460 for (i
= tsi_start (*tp
); !tsi_end_p (i
); tsi_next (&i
))
8461 WALK_SUBTREE (*tsi_stmt_ptr (i
));
8466 switch (OMP_CLAUSE_CODE (*tp
))
8468 case OMP_CLAUSE_PRIVATE
:
8469 case OMP_CLAUSE_SHARED
:
8470 case OMP_CLAUSE_FIRSTPRIVATE
:
8471 case OMP_CLAUSE_LASTPRIVATE
:
8472 case OMP_CLAUSE_COPYIN
:
8473 case OMP_CLAUSE_COPYPRIVATE
:
8475 case OMP_CLAUSE_NUM_THREADS
:
8476 case OMP_CLAUSE_SCHEDULE
:
8477 WALK_SUBTREE (OMP_CLAUSE_OPERAND (*tp
, 0));
8480 case OMP_CLAUSE_NOWAIT
:
8481 case OMP_CLAUSE_ORDERED
:
8482 case OMP_CLAUSE_DEFAULT
:
8483 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp
));
8485 case OMP_CLAUSE_REDUCTION
:
8488 for (i
= 0; i
< 4; i
++)
8489 WALK_SUBTREE (OMP_CLAUSE_OPERAND (*tp
, i
));
8490 WALK_SUBTREE_TAIL (OMP_CLAUSE_CHAIN (*tp
));
8502 /* TARGET_EXPRs are peculiar: operands 1 and 3 can be the same.
8503 But, we only want to walk once. */
8504 len
= (TREE_OPERAND (*tp
, 3) == TREE_OPERAND (*tp
, 1)) ? 2 : 3;
8505 for (i
= 0; i
< len
; ++i
)
8506 WALK_SUBTREE (TREE_OPERAND (*tp
, i
));
8507 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp
, len
));
8511 /* If this is a TYPE_DECL, walk into the fields of the type that it's
8512 defining. We only want to walk into these fields of a type in this
8513 case and not in the general case of a mere reference to the type.
8515 The criterion is as follows: if the field can be an expression, it
8516 must be walked only here. This should be in keeping with the fields
8517 that are directly gimplified in gimplify_type_sizes in order for the
8518 mark/copy-if-shared/unmark machinery of the gimplifier to work with
8519 variable-sized types.
8521 Note that DECLs get walked as part of processing the BIND_EXPR. */
8522 if (TREE_CODE (DECL_EXPR_DECL (*tp
)) == TYPE_DECL
)
8524 tree
*type_p
= &TREE_TYPE (DECL_EXPR_DECL (*tp
));
8525 if (TREE_CODE (*type_p
) == ERROR_MARK
)
8528 /* Call the function for the type. See if it returns anything or
8529 doesn't want us to continue. If we are to continue, walk both
8530 the normal fields and those for the declaration case. */
8531 result
= (*func
) (type_p
, &walk_subtrees
, data
);
8532 if (result
|| !walk_subtrees
)
8535 result
= walk_type_fields (*type_p
, func
, data
, pset
);
8539 /* If this is a record type, also walk the fields. */
8540 if (TREE_CODE (*type_p
) == RECORD_TYPE
8541 || TREE_CODE (*type_p
) == UNION_TYPE
8542 || TREE_CODE (*type_p
) == QUAL_UNION_TYPE
)
8546 for (field
= TYPE_FIELDS (*type_p
); field
;
8547 field
= TREE_CHAIN (field
))
8549 /* We'd like to look at the type of the field, but we can
8550 easily get infinite recursion. So assume it's pointed
8551 to elsewhere in the tree. Also, ignore things that
8553 if (TREE_CODE (field
) != FIELD_DECL
)
8556 WALK_SUBTREE (DECL_FIELD_OFFSET (field
));
8557 WALK_SUBTREE (DECL_SIZE (field
));
8558 WALK_SUBTREE (DECL_SIZE_UNIT (field
));
8559 if (TREE_CODE (*type_p
) == QUAL_UNION_TYPE
)
8560 WALK_SUBTREE (DECL_QUALIFIER (field
));
8564 /* Same for scalar types. */
8565 else if (TREE_CODE (*type_p
) == BOOLEAN_TYPE
8566 || TREE_CODE (*type_p
) == ENUMERAL_TYPE
8567 || TREE_CODE (*type_p
) == INTEGER_TYPE
8568 || TREE_CODE (*type_p
) == FIXED_POINT_TYPE
8569 || TREE_CODE (*type_p
) == REAL_TYPE
)
8571 WALK_SUBTREE (TYPE_MIN_VALUE (*type_p
));
8572 WALK_SUBTREE (TYPE_MAX_VALUE (*type_p
));
8575 WALK_SUBTREE (TYPE_SIZE (*type_p
));
8576 WALK_SUBTREE_TAIL (TYPE_SIZE_UNIT (*type_p
));
8581 if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code
))
8582 || IS_GIMPLE_STMT_CODE_CLASS (TREE_CODE_CLASS (code
)))
8586 /* Walk over all the sub-trees of this operand. */
8587 len
= TREE_OPERAND_LENGTH (*tp
);
8589 /* Go through the subtrees. We need to do this in forward order so
8590 that the scope of a FOR_EXPR is handled properly. */
8593 for (i
= 0; i
< len
- 1; ++i
)
8594 WALK_SUBTREE (GENERIC_TREE_OPERAND (*tp
, i
));
8595 WALK_SUBTREE_TAIL (GENERIC_TREE_OPERAND (*tp
, len
- 1));
8598 /* If this is a type, walk the needed fields in the type. */
8599 else if (TYPE_P (*tp
))
8600 return walk_type_fields (*tp
, func
, data
, pset
);
8604 /* We didn't find what we were looking for. */
8607 #undef WALK_SUBTREE_TAIL
8611 /* Like walk_tree, but does not walk duplicate nodes more than once. */
8614 walk_tree_without_duplicates (tree
*tp
, walk_tree_fn func
, void *data
)
8617 struct pointer_set_t
*pset
;
8619 pset
= pointer_set_create ();
8620 result
= walk_tree (tp
, func
, data
, pset
);
8621 pointer_set_destroy (pset
);
8626 /* Return true if STMT is an empty statement or contains nothing but
8627 empty statements. */
8630 empty_body_p (tree stmt
)
8632 tree_stmt_iterator i
;
8635 if (IS_EMPTY_STMT (stmt
))
8637 else if (TREE_CODE (stmt
) == BIND_EXPR
)
8638 body
= BIND_EXPR_BODY (stmt
);
8639 else if (TREE_CODE (stmt
) == STATEMENT_LIST
)
8644 for (i
= tsi_start (body
); !tsi_end_p (i
); tsi_next (&i
))
8645 if (!empty_body_p (tsi_stmt (i
)))
8654 char const c
= TREE_CODE_CLASS (TREE_CODE (t
));
8656 if (IS_EXPR_CODE_CLASS (c
))
8657 return &t
->exp
.block
;
8658 else if (IS_GIMPLE_STMT_CODE_CLASS (c
))
8659 return &GIMPLE_STMT_BLOCK (t
);
8665 generic_tree_operand (tree node
, int i
)
8667 if (GIMPLE_STMT_P (node
))
8668 return &GIMPLE_STMT_OPERAND (node
, i
);
8669 return &TREE_OPERAND (node
, i
);
8673 generic_tree_type (tree node
)
8675 if (GIMPLE_STMT_P (node
))
8676 return &void_type_node
;
8677 return &TREE_TYPE (node
);
8680 /* Build and return a TREE_LIST of arguments in the CALL_EXPR exp.
8681 FIXME: don't use this function. It exists for compatibility with
8682 the old representation of CALL_EXPRs where a list was used to hold the
8683 arguments. Places that currently extract the arglist from a CALL_EXPR
8684 ought to be rewritten to use the CALL_EXPR itself. */
8686 call_expr_arglist (tree exp
)
8688 tree arglist
= NULL_TREE
;
8690 for (i
= call_expr_nargs (exp
) - 1; i
>= 0; i
--)
8691 arglist
= tree_cons (NULL_TREE
, CALL_EXPR_ARG (exp
, i
), arglist
);
8695 #include "gt-tree.h"