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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
22 /* This file contains the low level primitives for operating on tree nodes,
23 including allocation, list operations, interning of identifiers,
24 construction of data type nodes and statement nodes,
25 and construction of type conversion nodes. It also contains
26 tables index by tree code that describe how to take apart
29 It is intended to be language-independent, but occasionally
30 calls language-dependent routines defined (for C) in typecheck.c. */
34 #include "coretypes.h"
47 #include "langhooks.h"
48 #include "tree-iterator.h"
49 #include "basic-block.h"
50 #include "tree-flow.h"
52 #include "pointer-set.h"
54 /* Each tree code class has an associated string representation.
55 These must correspond to the tree_code_class entries. */
57 const char *const tree_code_class_strings
[] =
71 /* obstack.[ch] explicitly declined to prototype this. */
72 extern int _obstack_allocated_p (struct obstack
*h
, void *obj
);
74 #ifdef GATHER_STATISTICS
75 /* Statistics-gathering stuff. */
77 int tree_node_counts
[(int) all_kinds
];
78 int tree_node_sizes
[(int) all_kinds
];
80 /* Keep in sync with tree.h:enum tree_node_kind. */
81 static const char * const tree_node_kind_names
[] = {
101 #endif /* GATHER_STATISTICS */
103 /* Unique id for next decl created. */
104 static GTY(()) int next_decl_uid
;
105 /* Unique id for next type created. */
106 static GTY(()) int next_type_uid
= 1;
108 /* Since we cannot rehash a type after it is in the table, we have to
109 keep the hash code. */
111 struct type_hash
GTY(())
117 /* Initial size of the hash table (rounded to next prime). */
118 #define TYPE_HASH_INITIAL_SIZE 1000
120 /* Now here is the hash table. When recording a type, it is added to
121 the slot whose index is the hash code. Note that the hash table is
122 used for several kinds of types (function types, array types and
123 array index range types, for now). While all these live in the
124 same table, they are completely independent, and the hash code is
125 computed differently for each of these. */
127 static GTY ((if_marked ("type_hash_marked_p"), param_is (struct type_hash
)))
128 htab_t type_hash_table
;
130 /* Hash table and temporary node for larger integer const values. */
131 static GTY (()) tree int_cst_node
;
132 static GTY ((if_marked ("ggc_marked_p"), param_is (union tree_node
)))
133 htab_t int_cst_hash_table
;
135 /* General tree->tree mapping structure for use in hash tables. */
138 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
139 htab_t debug_expr_for_decl
;
141 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
142 htab_t value_expr_for_decl
;
144 static GTY ((if_marked ("tree_int_map_marked_p"), param_is (struct tree_int_map
)))
145 htab_t init_priority_for_decl
;
147 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
148 htab_t restrict_base_for_decl
;
150 struct tree_int_map
GTY(())
155 static unsigned int tree_int_map_hash (const void *);
156 static int tree_int_map_eq (const void *, const void *);
157 static int tree_int_map_marked_p (const void *);
158 static void set_type_quals (tree
, int);
159 static int type_hash_eq (const void *, const void *);
160 static hashval_t
type_hash_hash (const void *);
161 static hashval_t
int_cst_hash_hash (const void *);
162 static int int_cst_hash_eq (const void *, const void *);
163 static void print_type_hash_statistics (void);
164 static void print_debug_expr_statistics (void);
165 static void print_value_expr_statistics (void);
166 static tree
make_vector_type (tree
, int, enum machine_mode
);
167 static int type_hash_marked_p (const void *);
168 static unsigned int type_hash_list (tree
, hashval_t
);
169 static unsigned int attribute_hash_list (tree
, hashval_t
);
171 tree global_trees
[TI_MAX
];
172 tree integer_types
[itk_none
];
174 unsigned char tree_contains_struct
[256][64];
182 /* Initialize the hash table of types. */
183 type_hash_table
= htab_create_ggc (TYPE_HASH_INITIAL_SIZE
, type_hash_hash
,
186 debug_expr_for_decl
= htab_create_ggc (512, tree_map_hash
,
189 value_expr_for_decl
= htab_create_ggc (512, tree_map_hash
,
191 init_priority_for_decl
= htab_create_ggc (512, tree_int_map_hash
,
193 restrict_base_for_decl
= htab_create_ggc (256, tree_map_hash
,
196 int_cst_hash_table
= htab_create_ggc (1024, int_cst_hash_hash
,
197 int_cst_hash_eq
, NULL
);
199 int_cst_node
= make_node (INTEGER_CST
);
201 tree_contains_struct
[FUNCTION_DECL
][TS_DECL_NON_COMMON
] = 1;
202 tree_contains_struct
[TRANSLATION_UNIT_DECL
][TS_DECL_NON_COMMON
] = 1;
203 tree_contains_struct
[TYPE_DECL
][TS_DECL_NON_COMMON
] = 1;
206 tree_contains_struct
[CONST_DECL
][TS_DECL_COMMON
] = 1;
207 tree_contains_struct
[VAR_DECL
][TS_DECL_COMMON
] = 1;
208 tree_contains_struct
[PARM_DECL
][TS_DECL_COMMON
] = 1;
209 tree_contains_struct
[RESULT_DECL
][TS_DECL_COMMON
] = 1;
210 tree_contains_struct
[FUNCTION_DECL
][TS_DECL_COMMON
] = 1;
211 tree_contains_struct
[TYPE_DECL
][TS_DECL_COMMON
] = 1;
212 tree_contains_struct
[TRANSLATION_UNIT_DECL
][TS_DECL_COMMON
] = 1;
213 tree_contains_struct
[LABEL_DECL
][TS_DECL_COMMON
] = 1;
214 tree_contains_struct
[FIELD_DECL
][TS_DECL_COMMON
] = 1;
217 tree_contains_struct
[CONST_DECL
][TS_DECL_WRTL
] = 1;
218 tree_contains_struct
[VAR_DECL
][TS_DECL_WRTL
] = 1;
219 tree_contains_struct
[PARM_DECL
][TS_DECL_WRTL
] = 1;
220 tree_contains_struct
[RESULT_DECL
][TS_DECL_WRTL
] = 1;
221 tree_contains_struct
[FUNCTION_DECL
][TS_DECL_WRTL
] = 1;
222 tree_contains_struct
[LABEL_DECL
][TS_DECL_WRTL
] = 1;
224 tree_contains_struct
[CONST_DECL
][TS_DECL_MINIMAL
] = 1;
225 tree_contains_struct
[VAR_DECL
][TS_DECL_MINIMAL
] = 1;
226 tree_contains_struct
[PARM_DECL
][TS_DECL_MINIMAL
] = 1;
227 tree_contains_struct
[RESULT_DECL
][TS_DECL_MINIMAL
] = 1;
228 tree_contains_struct
[FUNCTION_DECL
][TS_DECL_MINIMAL
] = 1;
229 tree_contains_struct
[TYPE_DECL
][TS_DECL_MINIMAL
] = 1;
230 tree_contains_struct
[TRANSLATION_UNIT_DECL
][TS_DECL_MINIMAL
] = 1;
231 tree_contains_struct
[LABEL_DECL
][TS_DECL_MINIMAL
] = 1;
232 tree_contains_struct
[FIELD_DECL
][TS_DECL_MINIMAL
] = 1;
233 tree_contains_struct
[STRUCT_FIELD_TAG
][TS_DECL_MINIMAL
] = 1;
234 tree_contains_struct
[NAME_MEMORY_TAG
][TS_DECL_MINIMAL
] = 1;
235 tree_contains_struct
[TYPE_MEMORY_TAG
][TS_DECL_MINIMAL
] = 1;
237 tree_contains_struct
[STRUCT_FIELD_TAG
][TS_MEMORY_TAG
] = 1;
238 tree_contains_struct
[NAME_MEMORY_TAG
][TS_MEMORY_TAG
] = 1;
239 tree_contains_struct
[TYPE_MEMORY_TAG
][TS_MEMORY_TAG
] = 1;
241 tree_contains_struct
[VAR_DECL
][TS_DECL_WITH_VIS
] = 1;
242 tree_contains_struct
[FUNCTION_DECL
][TS_DECL_WITH_VIS
] = 1;
243 tree_contains_struct
[TYPE_DECL
][TS_DECL_WITH_VIS
] = 1;
244 tree_contains_struct
[TRANSLATION_UNIT_DECL
][TS_DECL_WITH_VIS
] = 1;
246 tree_contains_struct
[VAR_DECL
][TS_VAR_DECL
] = 1;
247 tree_contains_struct
[FIELD_DECL
][TS_FIELD_DECL
] = 1;
248 tree_contains_struct
[PARM_DECL
][TS_PARM_DECL
] = 1;
249 tree_contains_struct
[LABEL_DECL
][TS_LABEL_DECL
] = 1;
250 tree_contains_struct
[RESULT_DECL
][TS_RESULT_DECL
] = 1;
251 tree_contains_struct
[CONST_DECL
][TS_CONST_DECL
] = 1;
252 tree_contains_struct
[TYPE_DECL
][TS_TYPE_DECL
] = 1;
253 tree_contains_struct
[FUNCTION_DECL
][TS_FUNCTION_DECL
] = 1;
255 lang_hooks
.init_ts ();
259 /* The name of the object as the assembler will see it (but before any
260 translations made by ASM_OUTPUT_LABELREF). Often this is the same
261 as DECL_NAME. It is an IDENTIFIER_NODE. */
263 decl_assembler_name (tree decl
)
265 if (!DECL_ASSEMBLER_NAME_SET_P (decl
))
266 lang_hooks
.set_decl_assembler_name (decl
);
267 return DECL_WITH_VIS_CHECK (decl
)->decl_with_vis
.assembler_name
;
270 /* Compute the number of bytes occupied by a tree with code CODE.
271 This function cannot be used for TREE_VEC, PHI_NODE, or STRING_CST
272 codes, which are of variable length. */
274 tree_code_size (enum tree_code code
)
276 switch (TREE_CODE_CLASS (code
))
278 case tcc_declaration
: /* A decl node */
283 return sizeof (struct tree_field_decl
);
285 return sizeof (struct tree_parm_decl
);
287 return sizeof (struct tree_var_decl
);
289 return sizeof (struct tree_label_decl
);
291 return sizeof (struct tree_result_decl
);
293 return sizeof (struct tree_const_decl
);
295 return sizeof (struct tree_type_decl
);
297 return sizeof (struct tree_function_decl
);
298 case NAME_MEMORY_TAG
:
299 case TYPE_MEMORY_TAG
:
300 case STRUCT_FIELD_TAG
:
301 return sizeof (struct tree_memory_tag
);
303 return sizeof (struct tree_decl_non_common
);
307 case tcc_type
: /* a type node */
308 return sizeof (struct tree_type
);
310 case tcc_reference
: /* a reference */
311 case tcc_expression
: /* an expression */
312 case tcc_statement
: /* an expression with side effects */
313 case tcc_comparison
: /* a comparison expression */
314 case tcc_unary
: /* a unary arithmetic expression */
315 case tcc_binary
: /* a binary arithmetic expression */
316 return (sizeof (struct tree_exp
)
317 + (TREE_CODE_LENGTH (code
) - 1) * sizeof (char *));
319 case tcc_constant
: /* a constant */
322 case INTEGER_CST
: return sizeof (struct tree_int_cst
);
323 case REAL_CST
: return sizeof (struct tree_real_cst
);
324 case COMPLEX_CST
: return sizeof (struct tree_complex
);
325 case VECTOR_CST
: return sizeof (struct tree_vector
);
326 case STRING_CST
: gcc_unreachable ();
328 return lang_hooks
.tree_size (code
);
331 case tcc_exceptional
: /* something random, like an identifier. */
334 case IDENTIFIER_NODE
: return lang_hooks
.identifier_size
;
335 case TREE_LIST
: return sizeof (struct tree_list
);
338 case PLACEHOLDER_EXPR
: return sizeof (struct tree_common
);
341 case PHI_NODE
: gcc_unreachable ();
343 case SSA_NAME
: return sizeof (struct tree_ssa_name
);
345 case STATEMENT_LIST
: return sizeof (struct tree_statement_list
);
346 case BLOCK
: return sizeof (struct tree_block
);
347 case VALUE_HANDLE
: return sizeof (struct tree_value_handle
);
348 case CONSTRUCTOR
: return sizeof (struct tree_constructor
);
351 return lang_hooks
.tree_size (code
);
359 /* Compute the number of bytes occupied by NODE. This routine only
360 looks at TREE_CODE, except for PHI_NODE and TREE_VEC nodes. */
362 tree_size (tree node
)
364 enum tree_code code
= TREE_CODE (node
);
368 return (sizeof (struct tree_phi_node
)
369 + (PHI_ARG_CAPACITY (node
) - 1) * sizeof (struct phi_arg_d
));
372 return (offsetof (struct tree_binfo
, base_binfos
)
373 + VEC_embedded_size (tree
, BINFO_N_BASE_BINFOS (node
)));
376 return (sizeof (struct tree_vec
)
377 + (TREE_VEC_LENGTH (node
) - 1) * sizeof(char *));
380 return sizeof (struct tree_string
) + TREE_STRING_LENGTH (node
) - 1;
383 return tree_code_size (code
);
387 /* Return a newly allocated node of code CODE. For decl and type
388 nodes, some other fields are initialized. The rest of the node is
389 initialized to zero. This function cannot be used for PHI_NODE or
390 TREE_VEC nodes, which is enforced by asserts in tree_code_size.
392 Achoo! I got a code in the node. */
395 make_node_stat (enum tree_code code MEM_STAT_DECL
)
398 enum tree_code_class type
= TREE_CODE_CLASS (code
);
399 size_t length
= tree_code_size (code
);
400 #ifdef GATHER_STATISTICS
405 case tcc_declaration
: /* A decl node */
409 case tcc_type
: /* a type node */
413 case tcc_statement
: /* an expression with side effects */
417 case tcc_reference
: /* a reference */
421 case tcc_expression
: /* an expression */
422 case tcc_comparison
: /* a comparison expression */
423 case tcc_unary
: /* a unary arithmetic expression */
424 case tcc_binary
: /* a binary arithmetic expression */
428 case tcc_constant
: /* a constant */
432 case tcc_exceptional
: /* something random, like an identifier. */
435 case IDENTIFIER_NODE
:
452 kind
= ssa_name_kind
;
473 tree_node_counts
[(int) kind
]++;
474 tree_node_sizes
[(int) kind
] += length
;
477 if (code
== IDENTIFIER_NODE
)
478 t
= ggc_alloc_zone_pass_stat (length
, &tree_id_zone
);
480 t
= ggc_alloc_zone_pass_stat (length
, &tree_zone
);
482 memset (t
, 0, length
);
484 TREE_SET_CODE (t
, code
);
489 TREE_SIDE_EFFECTS (t
) = 1;
492 case tcc_declaration
:
493 if (CODE_CONTAINS_STRUCT (code
, TS_DECL_WITH_VIS
))
494 DECL_IN_SYSTEM_HEADER (t
) = in_system_header
;
495 if (CODE_CONTAINS_STRUCT (code
, TS_DECL_COMMON
))
497 if (code
!= FUNCTION_DECL
)
499 DECL_USER_ALIGN (t
) = 0;
500 /* We have not yet computed the alias set for this declaration. */
501 DECL_POINTER_ALIAS_SET (t
) = -1;
503 DECL_SOURCE_LOCATION (t
) = input_location
;
504 DECL_UID (t
) = next_decl_uid
++;
509 TYPE_UID (t
) = next_type_uid
++;
510 TYPE_ALIGN (t
) = BITS_PER_UNIT
;
511 TYPE_USER_ALIGN (t
) = 0;
512 TYPE_MAIN_VARIANT (t
) = t
;
514 /* Default to no attributes for type, but let target change that. */
515 TYPE_ATTRIBUTES (t
) = NULL_TREE
;
516 targetm
.set_default_type_attributes (t
);
518 /* We have not yet computed the alias set for this type. */
519 TYPE_ALIAS_SET (t
) = -1;
523 TREE_CONSTANT (t
) = 1;
524 TREE_INVARIANT (t
) = 1;
533 case PREDECREMENT_EXPR
:
534 case PREINCREMENT_EXPR
:
535 case POSTDECREMENT_EXPR
:
536 case POSTINCREMENT_EXPR
:
537 /* All of these have side-effects, no matter what their
539 TREE_SIDE_EFFECTS (t
) = 1;
548 /* Other classes need no special treatment. */
555 /* Return a new node with the same contents as NODE except that its
556 TREE_CHAIN is zero and it has a fresh uid. */
559 copy_node_stat (tree node MEM_STAT_DECL
)
562 enum tree_code code
= TREE_CODE (node
);
565 gcc_assert (code
!= STATEMENT_LIST
);
567 length
= tree_size (node
);
568 t
= ggc_alloc_zone_pass_stat (length
, &tree_zone
);
569 memcpy (t
, node
, length
);
572 TREE_ASM_WRITTEN (t
) = 0;
573 TREE_VISITED (t
) = 0;
576 if (TREE_CODE_CLASS (code
) == tcc_declaration
)
578 DECL_UID (t
) = next_decl_uid
++;
579 if ((TREE_CODE (node
) == PARM_DECL
|| TREE_CODE (node
) == VAR_DECL
)
580 && DECL_HAS_VALUE_EXPR_P (node
))
582 SET_DECL_VALUE_EXPR (t
, DECL_VALUE_EXPR (node
));
583 DECL_HAS_VALUE_EXPR_P (t
) = 1;
585 if (TREE_CODE (node
) == VAR_DECL
&& DECL_HAS_INIT_PRIORITY_P (node
))
587 SET_DECL_INIT_PRIORITY (t
, DECL_INIT_PRIORITY (node
));
588 DECL_HAS_INIT_PRIORITY_P (t
) = 1;
590 if (TREE_CODE (node
) == VAR_DECL
&& DECL_BASED_ON_RESTRICT_P (node
))
592 SET_DECL_RESTRICT_BASE (t
, DECL_GET_RESTRICT_BASE (node
));
593 DECL_BASED_ON_RESTRICT_P (t
) = 1;
596 else if (TREE_CODE_CLASS (code
) == tcc_type
)
598 TYPE_UID (t
) = next_type_uid
++;
599 /* The following is so that the debug code for
600 the copy is different from the original type.
601 The two statements usually duplicate each other
602 (because they clear fields of the same union),
603 but the optimizer should catch that. */
604 TYPE_SYMTAB_POINTER (t
) = 0;
605 TYPE_SYMTAB_ADDRESS (t
) = 0;
607 /* Do not copy the values cache. */
608 if (TYPE_CACHED_VALUES_P(t
))
610 TYPE_CACHED_VALUES_P (t
) = 0;
611 TYPE_CACHED_VALUES (t
) = NULL_TREE
;
618 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
619 For example, this can copy a list made of TREE_LIST nodes. */
622 copy_list (tree list
)
630 head
= prev
= copy_node (list
);
631 next
= TREE_CHAIN (list
);
634 TREE_CHAIN (prev
) = copy_node (next
);
635 prev
= TREE_CHAIN (prev
);
636 next
= TREE_CHAIN (next
);
642 /* Create an INT_CST node with a LOW value sign extended. */
645 build_int_cst (tree type
, HOST_WIDE_INT low
)
647 return build_int_cst_wide (type
, low
, low
< 0 ? -1 : 0);
650 /* Create an INT_CST node with a LOW value zero extended. */
653 build_int_cstu (tree type
, unsigned HOST_WIDE_INT low
)
655 return build_int_cst_wide (type
, low
, 0);
658 /* Create an INT_CST node with a LOW value in TYPE. The value is sign extended
659 if it is negative. This function is similar to build_int_cst, but
660 the extra bits outside of the type precision are cleared. Constants
661 with these extra bits may confuse the fold so that it detects overflows
662 even in cases when they do not occur, and in general should be avoided.
663 We cannot however make this a default behavior of build_int_cst without
664 more intrusive changes, since there are parts of gcc that rely on the extra
665 precision of the integer constants. */
668 build_int_cst_type (tree type
, HOST_WIDE_INT low
)
670 unsigned HOST_WIDE_INT val
= (unsigned HOST_WIDE_INT
) low
;
671 unsigned HOST_WIDE_INT hi
, mask
;
677 type
= integer_type_node
;
679 bits
= TYPE_PRECISION (type
);
680 signed_p
= !TYPE_UNSIGNED (type
);
682 if (bits
>= HOST_BITS_PER_WIDE_INT
)
683 negative
= (low
< 0);
686 /* If the sign bit is inside precision of LOW, use it to determine
687 the sign of the constant. */
688 negative
= ((val
>> (bits
- 1)) & 1) != 0;
690 /* Mask out the bits outside of the precision of the constant. */
691 mask
= (((unsigned HOST_WIDE_INT
) 2) << (bits
- 1)) - 1;
693 if (signed_p
&& negative
)
699 /* Determine the high bits. */
700 hi
= (negative
? ~(unsigned HOST_WIDE_INT
) 0 : 0);
702 /* For unsigned type we need to mask out the bits outside of the type
706 if (bits
<= HOST_BITS_PER_WIDE_INT
)
710 bits
-= HOST_BITS_PER_WIDE_INT
;
711 mask
= (((unsigned HOST_WIDE_INT
) 2) << (bits
- 1)) - 1;
716 return build_int_cst_wide (type
, val
, hi
);
719 /* These are the hash table functions for the hash table of INTEGER_CST
720 nodes of a sizetype. */
722 /* Return the hash code code X, an INTEGER_CST. */
725 int_cst_hash_hash (const void *x
)
729 return (TREE_INT_CST_HIGH (t
) ^ TREE_INT_CST_LOW (t
)
730 ^ htab_hash_pointer (TREE_TYPE (t
)));
733 /* Return nonzero if the value represented by *X (an INTEGER_CST tree node)
734 is the same as that given by *Y, which is the same. */
737 int_cst_hash_eq (const void *x
, const void *y
)
742 return (TREE_TYPE (xt
) == TREE_TYPE (yt
)
743 && TREE_INT_CST_HIGH (xt
) == TREE_INT_CST_HIGH (yt
)
744 && TREE_INT_CST_LOW (xt
) == TREE_INT_CST_LOW (yt
));
747 /* Create an INT_CST node of TYPE and value HI:LOW. If TYPE is NULL,
748 integer_type_node is used. The returned node is always shared.
749 For small integers we use a per-type vector cache, for larger ones
750 we use a single hash table. */
753 build_int_cst_wide (tree type
, unsigned HOST_WIDE_INT low
, HOST_WIDE_INT hi
)
760 type
= integer_type_node
;
762 switch (TREE_CODE (type
))
766 /* Cache NULL pointer. */
775 /* Cache false or true. */
784 if (TYPE_UNSIGNED (type
))
787 limit
= INTEGER_SHARE_LIMIT
;
788 if (!hi
&& low
< (unsigned HOST_WIDE_INT
)INTEGER_SHARE_LIMIT
)
794 limit
= INTEGER_SHARE_LIMIT
+ 1;
795 if (!hi
&& low
< (unsigned HOST_WIDE_INT
)INTEGER_SHARE_LIMIT
)
797 else if (hi
== -1 && low
== -(unsigned HOST_WIDE_INT
)1)
807 /* Look for it in the type's vector of small shared ints. */
808 if (!TYPE_CACHED_VALUES_P (type
))
810 TYPE_CACHED_VALUES_P (type
) = 1;
811 TYPE_CACHED_VALUES (type
) = make_tree_vec (limit
);
814 t
= TREE_VEC_ELT (TYPE_CACHED_VALUES (type
), ix
);
817 /* Make sure no one is clobbering the shared constant. */
818 gcc_assert (TREE_TYPE (t
) == type
);
819 gcc_assert (TREE_INT_CST_LOW (t
) == low
);
820 gcc_assert (TREE_INT_CST_HIGH (t
) == hi
);
824 /* Create a new shared int. */
825 t
= make_node (INTEGER_CST
);
827 TREE_INT_CST_LOW (t
) = low
;
828 TREE_INT_CST_HIGH (t
) = hi
;
829 TREE_TYPE (t
) = type
;
831 TREE_VEC_ELT (TYPE_CACHED_VALUES (type
), ix
) = t
;
836 /* Use the cache of larger shared ints. */
839 TREE_INT_CST_LOW (int_cst_node
) = low
;
840 TREE_INT_CST_HIGH (int_cst_node
) = hi
;
841 TREE_TYPE (int_cst_node
) = type
;
843 slot
= htab_find_slot (int_cst_hash_table
, int_cst_node
, INSERT
);
847 /* Insert this one into the hash table. */
850 /* Make a new node for next time round. */
851 int_cst_node
= make_node (INTEGER_CST
);
858 /* Builds an integer constant in TYPE such that lowest BITS bits are ones
859 and the rest are zeros. */
862 build_low_bits_mask (tree type
, unsigned bits
)
864 unsigned HOST_WIDE_INT low
;
866 unsigned HOST_WIDE_INT all_ones
= ~(unsigned HOST_WIDE_INT
) 0;
868 gcc_assert (bits
<= TYPE_PRECISION (type
));
870 if (bits
== TYPE_PRECISION (type
)
871 && !TYPE_UNSIGNED (type
))
873 /* Sign extended all-ones mask. */
877 else if (bits
<= HOST_BITS_PER_WIDE_INT
)
879 low
= all_ones
>> (HOST_BITS_PER_WIDE_INT
- bits
);
884 bits
-= HOST_BITS_PER_WIDE_INT
;
886 high
= all_ones
>> (HOST_BITS_PER_WIDE_INT
- bits
);
889 return build_int_cst_wide (type
, low
, high
);
892 /* Checks that X is integer constant that can be expressed in (unsigned)
893 HOST_WIDE_INT without loss of precision. */
896 cst_and_fits_in_hwi (tree x
)
898 if (TREE_CODE (x
) != INTEGER_CST
)
901 if (TYPE_PRECISION (TREE_TYPE (x
)) > HOST_BITS_PER_WIDE_INT
)
904 return (TREE_INT_CST_HIGH (x
) == 0
905 || TREE_INT_CST_HIGH (x
) == -1);
908 /* Return a new VECTOR_CST node whose type is TYPE and whose values
909 are in a list pointed to by VALS. */
912 build_vector (tree type
, tree vals
)
914 tree v
= make_node (VECTOR_CST
);
915 int over1
= 0, over2
= 0;
918 TREE_VECTOR_CST_ELTS (v
) = vals
;
919 TREE_TYPE (v
) = type
;
921 /* Iterate through elements and check for overflow. */
922 for (link
= vals
; link
; link
= TREE_CHAIN (link
))
924 tree value
= TREE_VALUE (link
);
926 over1
|= TREE_OVERFLOW (value
);
927 over2
|= TREE_CONSTANT_OVERFLOW (value
);
930 TREE_OVERFLOW (v
) = over1
;
931 TREE_CONSTANT_OVERFLOW (v
) = over2
;
936 /* Return a new VECTOR_CST node whose type is TYPE and whose values
937 are extracted from V, a vector of CONSTRUCTOR_ELT. */
940 build_vector_from_ctor (tree type
, VEC(constructor_elt
,gc
) *v
)
942 tree list
= NULL_TREE
;
943 unsigned HOST_WIDE_INT idx
;
946 FOR_EACH_CONSTRUCTOR_VALUE (v
, idx
, value
)
947 list
= tree_cons (NULL_TREE
, value
, list
);
948 return build_vector (type
, nreverse (list
));
951 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
952 are in the VEC pointed to by VALS. */
954 build_constructor (tree type
, VEC(constructor_elt
,gc
) *vals
)
956 tree c
= make_node (CONSTRUCTOR
);
957 TREE_TYPE (c
) = type
;
958 CONSTRUCTOR_ELTS (c
) = vals
;
962 /* Build a CONSTRUCTOR node made of a single initializer, with the specified
965 build_constructor_single (tree type
, tree index
, tree value
)
967 VEC(constructor_elt
,gc
) *v
;
968 constructor_elt
*elt
;
970 v
= VEC_alloc (constructor_elt
, gc
, 1);
971 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
975 return build_constructor (type
, v
);
979 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
980 are in a list pointed to by VALS. */
982 build_constructor_from_list (tree type
, tree vals
)
985 VEC(constructor_elt
,gc
) *v
= NULL
;
989 v
= VEC_alloc (constructor_elt
, gc
, list_length (vals
));
990 for (t
= vals
; t
; t
= TREE_CHAIN (t
))
992 constructor_elt
*elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
993 elt
->index
= TREE_PURPOSE (t
);
994 elt
->value
= TREE_VALUE (t
);
998 return build_constructor (type
, v
);
1002 /* Return a new REAL_CST node whose type is TYPE and value is D. */
1005 build_real (tree type
, REAL_VALUE_TYPE d
)
1008 REAL_VALUE_TYPE
*dp
;
1011 /* ??? Used to check for overflow here via CHECK_FLOAT_TYPE.
1012 Consider doing it via real_convert now. */
1014 v
= make_node (REAL_CST
);
1015 dp
= ggc_alloc (sizeof (REAL_VALUE_TYPE
));
1016 memcpy (dp
, &d
, sizeof (REAL_VALUE_TYPE
));
1018 TREE_TYPE (v
) = type
;
1019 TREE_REAL_CST_PTR (v
) = dp
;
1020 TREE_OVERFLOW (v
) = TREE_CONSTANT_OVERFLOW (v
) = overflow
;
1024 /* Return a new REAL_CST node whose type is TYPE
1025 and whose value is the integer value of the INTEGER_CST node I. */
1028 real_value_from_int_cst (tree type
, tree i
)
1032 /* Clear all bits of the real value type so that we can later do
1033 bitwise comparisons to see if two values are the same. */
1034 memset (&d
, 0, sizeof d
);
1036 real_from_integer (&d
, type
? TYPE_MODE (type
) : VOIDmode
,
1037 TREE_INT_CST_LOW (i
), TREE_INT_CST_HIGH (i
),
1038 TYPE_UNSIGNED (TREE_TYPE (i
)));
1042 /* Given a tree representing an integer constant I, return a tree
1043 representing the same value as a floating-point constant of type TYPE. */
1046 build_real_from_int_cst (tree type
, tree i
)
1049 int overflow
= TREE_OVERFLOW (i
);
1051 v
= build_real (type
, real_value_from_int_cst (type
, i
));
1053 TREE_OVERFLOW (v
) |= overflow
;
1054 TREE_CONSTANT_OVERFLOW (v
) |= overflow
;
1058 /* Return a newly constructed STRING_CST node whose value is
1059 the LEN characters at STR.
1060 The TREE_TYPE is not initialized. */
1063 build_string (int len
, const char *str
)
1068 length
= len
+ sizeof (struct tree_string
);
1070 #ifdef GATHER_STATISTICS
1071 tree_node_counts
[(int) c_kind
]++;
1072 tree_node_sizes
[(int) c_kind
] += length
;
1075 s
= ggc_alloc_tree (length
);
1077 memset (s
, 0, sizeof (struct tree_common
));
1078 TREE_SET_CODE (s
, STRING_CST
);
1079 TREE_CONSTANT (s
) = 1;
1080 TREE_INVARIANT (s
) = 1;
1081 TREE_STRING_LENGTH (s
) = len
;
1082 memcpy ((char *) TREE_STRING_POINTER (s
), str
, len
);
1083 ((char *) TREE_STRING_POINTER (s
))[len
] = '\0';
1088 /* Return a newly constructed COMPLEX_CST node whose value is
1089 specified by the real and imaginary parts REAL and IMAG.
1090 Both REAL and IMAG should be constant nodes. TYPE, if specified,
1091 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
1094 build_complex (tree type
, tree real
, tree imag
)
1096 tree t
= make_node (COMPLEX_CST
);
1098 TREE_REALPART (t
) = real
;
1099 TREE_IMAGPART (t
) = imag
;
1100 TREE_TYPE (t
) = type
? type
: build_complex_type (TREE_TYPE (real
));
1101 TREE_OVERFLOW (t
) = TREE_OVERFLOW (real
) | TREE_OVERFLOW (imag
);
1102 TREE_CONSTANT_OVERFLOW (t
)
1103 = TREE_CONSTANT_OVERFLOW (real
) | TREE_CONSTANT_OVERFLOW (imag
);
1107 /* Build a BINFO with LEN language slots. */
1110 make_tree_binfo_stat (unsigned base_binfos MEM_STAT_DECL
)
1113 size_t length
= (offsetof (struct tree_binfo
, base_binfos
)
1114 + VEC_embedded_size (tree
, base_binfos
));
1116 #ifdef GATHER_STATISTICS
1117 tree_node_counts
[(int) binfo_kind
]++;
1118 tree_node_sizes
[(int) binfo_kind
] += length
;
1121 t
= ggc_alloc_zone_pass_stat (length
, &tree_zone
);
1123 memset (t
, 0, offsetof (struct tree_binfo
, base_binfos
));
1125 TREE_SET_CODE (t
, TREE_BINFO
);
1127 VEC_embedded_init (tree
, BINFO_BASE_BINFOS (t
), base_binfos
);
1133 /* Build a newly constructed TREE_VEC node of length LEN. */
1136 make_tree_vec_stat (int len MEM_STAT_DECL
)
1139 int length
= (len
- 1) * sizeof (tree
) + sizeof (struct tree_vec
);
1141 #ifdef GATHER_STATISTICS
1142 tree_node_counts
[(int) vec_kind
]++;
1143 tree_node_sizes
[(int) vec_kind
] += length
;
1146 t
= ggc_alloc_zone_pass_stat (length
, &tree_zone
);
1148 memset (t
, 0, length
);
1150 TREE_SET_CODE (t
, TREE_VEC
);
1151 TREE_VEC_LENGTH (t
) = len
;
1156 /* Return 1 if EXPR is the integer constant zero or a complex constant
1160 integer_zerop (tree expr
)
1164 return ((TREE_CODE (expr
) == INTEGER_CST
1165 && ! TREE_CONSTANT_OVERFLOW (expr
)
1166 && TREE_INT_CST_LOW (expr
) == 0
1167 && TREE_INT_CST_HIGH (expr
) == 0)
1168 || (TREE_CODE (expr
) == COMPLEX_CST
1169 && integer_zerop (TREE_REALPART (expr
))
1170 && integer_zerop (TREE_IMAGPART (expr
))));
1173 /* Return 1 if EXPR is the integer constant one or the corresponding
1174 complex constant. */
1177 integer_onep (tree expr
)
1181 return ((TREE_CODE (expr
) == INTEGER_CST
1182 && ! TREE_CONSTANT_OVERFLOW (expr
)
1183 && TREE_INT_CST_LOW (expr
) == 1
1184 && TREE_INT_CST_HIGH (expr
) == 0)
1185 || (TREE_CODE (expr
) == COMPLEX_CST
1186 && integer_onep (TREE_REALPART (expr
))
1187 && integer_zerop (TREE_IMAGPART (expr
))));
1190 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
1191 it contains. Likewise for the corresponding complex constant. */
1194 integer_all_onesp (tree expr
)
1201 if (TREE_CODE (expr
) == COMPLEX_CST
1202 && integer_all_onesp (TREE_REALPART (expr
))
1203 && integer_zerop (TREE_IMAGPART (expr
)))
1206 else if (TREE_CODE (expr
) != INTEGER_CST
1207 || TREE_CONSTANT_OVERFLOW (expr
))
1210 uns
= TYPE_UNSIGNED (TREE_TYPE (expr
));
1211 if (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
1212 && TREE_INT_CST_HIGH (expr
) == -1)
1217 /* Note that using TYPE_PRECISION here is wrong. We care about the
1218 actual bits, not the (arbitrary) range of the type. */
1219 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr
)));
1220 if (prec
>= HOST_BITS_PER_WIDE_INT
)
1222 HOST_WIDE_INT high_value
;
1225 shift_amount
= prec
- HOST_BITS_PER_WIDE_INT
;
1227 /* Can not handle precisions greater than twice the host int size. */
1228 gcc_assert (shift_amount
<= HOST_BITS_PER_WIDE_INT
);
1229 if (shift_amount
== HOST_BITS_PER_WIDE_INT
)
1230 /* Shifting by the host word size is undefined according to the ANSI
1231 standard, so we must handle this as a special case. */
1234 high_value
= ((HOST_WIDE_INT
) 1 << shift_amount
) - 1;
1236 return (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
1237 && TREE_INT_CST_HIGH (expr
) == high_value
);
1240 return TREE_INT_CST_LOW (expr
) == ((unsigned HOST_WIDE_INT
) 1 << prec
) - 1;
1243 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
1247 integer_pow2p (tree expr
)
1250 HOST_WIDE_INT high
, low
;
1254 if (TREE_CODE (expr
) == COMPLEX_CST
1255 && integer_pow2p (TREE_REALPART (expr
))
1256 && integer_zerop (TREE_IMAGPART (expr
)))
1259 if (TREE_CODE (expr
) != INTEGER_CST
|| TREE_CONSTANT_OVERFLOW (expr
))
1262 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
1263 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
1264 high
= TREE_INT_CST_HIGH (expr
);
1265 low
= TREE_INT_CST_LOW (expr
);
1267 /* First clear all bits that are beyond the type's precision in case
1268 we've been sign extended. */
1270 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
1272 else if (prec
> HOST_BITS_PER_WIDE_INT
)
1273 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
1277 if (prec
< HOST_BITS_PER_WIDE_INT
)
1278 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
1281 if (high
== 0 && low
== 0)
1284 return ((high
== 0 && (low
& (low
- 1)) == 0)
1285 || (low
== 0 && (high
& (high
- 1)) == 0));
1288 /* Return 1 if EXPR is an integer constant other than zero or a
1289 complex constant other than zero. */
1292 integer_nonzerop (tree expr
)
1296 return ((TREE_CODE (expr
) == INTEGER_CST
1297 && ! TREE_CONSTANT_OVERFLOW (expr
)
1298 && (TREE_INT_CST_LOW (expr
) != 0
1299 || TREE_INT_CST_HIGH (expr
) != 0))
1300 || (TREE_CODE (expr
) == COMPLEX_CST
1301 && (integer_nonzerop (TREE_REALPART (expr
))
1302 || integer_nonzerop (TREE_IMAGPART (expr
)))));
1305 /* Return the power of two represented by a tree node known to be a
1309 tree_log2 (tree expr
)
1312 HOST_WIDE_INT high
, low
;
1316 if (TREE_CODE (expr
) == COMPLEX_CST
)
1317 return tree_log2 (TREE_REALPART (expr
));
1319 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
1320 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
1322 high
= TREE_INT_CST_HIGH (expr
);
1323 low
= TREE_INT_CST_LOW (expr
);
1325 /* First clear all bits that are beyond the type's precision in case
1326 we've been sign extended. */
1328 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
1330 else if (prec
> HOST_BITS_PER_WIDE_INT
)
1331 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
1335 if (prec
< HOST_BITS_PER_WIDE_INT
)
1336 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
1339 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ exact_log2 (high
)
1340 : exact_log2 (low
));
1343 /* Similar, but return the largest integer Y such that 2 ** Y is less
1344 than or equal to EXPR. */
1347 tree_floor_log2 (tree expr
)
1350 HOST_WIDE_INT high
, low
;
1354 if (TREE_CODE (expr
) == COMPLEX_CST
)
1355 return tree_log2 (TREE_REALPART (expr
));
1357 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
1358 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
1360 high
= TREE_INT_CST_HIGH (expr
);
1361 low
= TREE_INT_CST_LOW (expr
);
1363 /* First clear all bits that are beyond the type's precision in case
1364 we've been sign extended. Ignore if type's precision hasn't been set
1365 since what we are doing is setting it. */
1367 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
|| prec
== 0)
1369 else if (prec
> HOST_BITS_PER_WIDE_INT
)
1370 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
1374 if (prec
< HOST_BITS_PER_WIDE_INT
)
1375 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
1378 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ floor_log2 (high
)
1379 : floor_log2 (low
));
1382 /* Return 1 if EXPR is the real constant zero. */
1385 real_zerop (tree expr
)
1389 return ((TREE_CODE (expr
) == REAL_CST
1390 && ! TREE_CONSTANT_OVERFLOW (expr
)
1391 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst0
))
1392 || (TREE_CODE (expr
) == COMPLEX_CST
1393 && real_zerop (TREE_REALPART (expr
))
1394 && real_zerop (TREE_IMAGPART (expr
))));
1397 /* Return 1 if EXPR is the real constant one in real or complex form. */
1400 real_onep (tree expr
)
1404 return ((TREE_CODE (expr
) == REAL_CST
1405 && ! TREE_CONSTANT_OVERFLOW (expr
)
1406 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst1
))
1407 || (TREE_CODE (expr
) == COMPLEX_CST
1408 && real_onep (TREE_REALPART (expr
))
1409 && real_zerop (TREE_IMAGPART (expr
))));
1412 /* Return 1 if EXPR is the real constant two. */
1415 real_twop (tree expr
)
1419 return ((TREE_CODE (expr
) == REAL_CST
1420 && ! TREE_CONSTANT_OVERFLOW (expr
)
1421 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst2
))
1422 || (TREE_CODE (expr
) == COMPLEX_CST
1423 && real_twop (TREE_REALPART (expr
))
1424 && real_zerop (TREE_IMAGPART (expr
))));
1427 /* Return 1 if EXPR is the real constant minus one. */
1430 real_minus_onep (tree expr
)
1434 return ((TREE_CODE (expr
) == REAL_CST
1435 && ! TREE_CONSTANT_OVERFLOW (expr
)
1436 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconstm1
))
1437 || (TREE_CODE (expr
) == COMPLEX_CST
1438 && real_minus_onep (TREE_REALPART (expr
))
1439 && real_zerop (TREE_IMAGPART (expr
))));
1442 /* Nonzero if EXP is a constant or a cast of a constant. */
1445 really_constant_p (tree exp
)
1447 /* This is not quite the same as STRIP_NOPS. It does more. */
1448 while (TREE_CODE (exp
) == NOP_EXPR
1449 || TREE_CODE (exp
) == CONVERT_EXPR
1450 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
1451 exp
= TREE_OPERAND (exp
, 0);
1452 return TREE_CONSTANT (exp
);
1455 /* Return first list element whose TREE_VALUE is ELEM.
1456 Return 0 if ELEM is not in LIST. */
1459 value_member (tree elem
, tree list
)
1463 if (elem
== TREE_VALUE (list
))
1465 list
= TREE_CHAIN (list
);
1470 /* Return first list element whose TREE_PURPOSE is ELEM.
1471 Return 0 if ELEM is not in LIST. */
1474 purpose_member (tree elem
, tree list
)
1478 if (elem
== TREE_PURPOSE (list
))
1480 list
= TREE_CHAIN (list
);
1485 /* Return nonzero if ELEM is part of the chain CHAIN. */
1488 chain_member (tree elem
, tree chain
)
1494 chain
= TREE_CHAIN (chain
);
1500 /* Return the length of a chain of nodes chained through TREE_CHAIN.
1501 We expect a null pointer to mark the end of the chain.
1502 This is the Lisp primitive `length'. */
1505 list_length (tree t
)
1508 #ifdef ENABLE_TREE_CHECKING
1516 #ifdef ENABLE_TREE_CHECKING
1519 gcc_assert (p
!= q
);
1527 /* Returns the number of FIELD_DECLs in TYPE. */
1530 fields_length (tree type
)
1532 tree t
= TYPE_FIELDS (type
);
1535 for (; t
; t
= TREE_CHAIN (t
))
1536 if (TREE_CODE (t
) == FIELD_DECL
)
1542 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
1543 by modifying the last node in chain 1 to point to chain 2.
1544 This is the Lisp primitive `nconc'. */
1547 chainon (tree op1
, tree op2
)
1556 for (t1
= op1
; TREE_CHAIN (t1
); t1
= TREE_CHAIN (t1
))
1558 TREE_CHAIN (t1
) = op2
;
1560 #ifdef ENABLE_TREE_CHECKING
1563 for (t2
= op2
; t2
; t2
= TREE_CHAIN (t2
))
1564 gcc_assert (t2
!= t1
);
1571 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
1574 tree_last (tree chain
)
1578 while ((next
= TREE_CHAIN (chain
)))
1583 /* Reverse the order of elements in the chain T,
1584 and return the new head of the chain (old last element). */
1589 tree prev
= 0, decl
, next
;
1590 for (decl
= t
; decl
; decl
= next
)
1592 next
= TREE_CHAIN (decl
);
1593 TREE_CHAIN (decl
) = prev
;
1599 /* Return a newly created TREE_LIST node whose
1600 purpose and value fields are PARM and VALUE. */
1603 build_tree_list_stat (tree parm
, tree value MEM_STAT_DECL
)
1605 tree t
= make_node_stat (TREE_LIST PASS_MEM_STAT
);
1606 TREE_PURPOSE (t
) = parm
;
1607 TREE_VALUE (t
) = value
;
1611 /* Return a newly created TREE_LIST node whose
1612 purpose and value fields are PURPOSE and VALUE
1613 and whose TREE_CHAIN is CHAIN. */
1616 tree_cons_stat (tree purpose
, tree value
, tree chain MEM_STAT_DECL
)
1620 node
= ggc_alloc_zone_pass_stat (sizeof (struct tree_list
), &tree_zone
);
1622 memset (node
, 0, sizeof (struct tree_common
));
1624 #ifdef GATHER_STATISTICS
1625 tree_node_counts
[(int) x_kind
]++;
1626 tree_node_sizes
[(int) x_kind
] += sizeof (struct tree_list
);
1629 TREE_SET_CODE (node
, TREE_LIST
);
1630 TREE_CHAIN (node
) = chain
;
1631 TREE_PURPOSE (node
) = purpose
;
1632 TREE_VALUE (node
) = value
;
1637 /* Return the size nominally occupied by an object of type TYPE
1638 when it resides in memory. The value is measured in units of bytes,
1639 and its data type is that normally used for type sizes
1640 (which is the first type created by make_signed_type or
1641 make_unsigned_type). */
1644 size_in_bytes (tree type
)
1648 if (type
== error_mark_node
)
1649 return integer_zero_node
;
1651 type
= TYPE_MAIN_VARIANT (type
);
1652 t
= TYPE_SIZE_UNIT (type
);
1656 lang_hooks
.types
.incomplete_type_error (NULL_TREE
, type
);
1657 return size_zero_node
;
1660 if (TREE_CODE (t
) == INTEGER_CST
)
1661 t
= force_fit_type (t
, 0, false, false);
1666 /* Return the size of TYPE (in bytes) as a wide integer
1667 or return -1 if the size can vary or is larger than an integer. */
1670 int_size_in_bytes (tree type
)
1674 if (type
== error_mark_node
)
1677 type
= TYPE_MAIN_VARIANT (type
);
1678 t
= TYPE_SIZE_UNIT (type
);
1680 || TREE_CODE (t
) != INTEGER_CST
1681 || TREE_OVERFLOW (t
)
1682 || TREE_INT_CST_HIGH (t
) != 0
1683 /* If the result would appear negative, it's too big to represent. */
1684 || (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0)
1687 return TREE_INT_CST_LOW (t
);
1690 /* Return the bit position of FIELD, in bits from the start of the record.
1691 This is a tree of type bitsizetype. */
1694 bit_position (tree field
)
1696 return bit_from_pos (DECL_FIELD_OFFSET (field
),
1697 DECL_FIELD_BIT_OFFSET (field
));
1700 /* Likewise, but return as an integer. It must be representable in
1701 that way (since it could be a signed value, we don't have the
1702 option of returning -1 like int_size_in_byte can. */
1705 int_bit_position (tree field
)
1707 return tree_low_cst (bit_position (field
), 0);
1710 /* Return the byte position of FIELD, in bytes from the start of the record.
1711 This is a tree of type sizetype. */
1714 byte_position (tree field
)
1716 return byte_from_pos (DECL_FIELD_OFFSET (field
),
1717 DECL_FIELD_BIT_OFFSET (field
));
1720 /* Likewise, but return as an integer. It must be representable in
1721 that way (since it could be a signed value, we don't have the
1722 option of returning -1 like int_size_in_byte can. */
1725 int_byte_position (tree field
)
1727 return tree_low_cst (byte_position (field
), 0);
1730 /* Return the strictest alignment, in bits, that T is known to have. */
1735 unsigned int align0
, align1
;
1737 switch (TREE_CODE (t
))
1739 case NOP_EXPR
: case CONVERT_EXPR
: case NON_LVALUE_EXPR
:
1740 /* If we have conversions, we know that the alignment of the
1741 object must meet each of the alignments of the types. */
1742 align0
= expr_align (TREE_OPERAND (t
, 0));
1743 align1
= TYPE_ALIGN (TREE_TYPE (t
));
1744 return MAX (align0
, align1
);
1746 case SAVE_EXPR
: case COMPOUND_EXPR
: case MODIFY_EXPR
:
1747 case INIT_EXPR
: case TARGET_EXPR
: case WITH_CLEANUP_EXPR
:
1748 case CLEANUP_POINT_EXPR
:
1749 /* These don't change the alignment of an object. */
1750 return expr_align (TREE_OPERAND (t
, 0));
1753 /* The best we can do is say that the alignment is the least aligned
1755 align0
= expr_align (TREE_OPERAND (t
, 1));
1756 align1
= expr_align (TREE_OPERAND (t
, 2));
1757 return MIN (align0
, align1
);
1759 case LABEL_DECL
: case CONST_DECL
:
1760 case VAR_DECL
: case PARM_DECL
: case RESULT_DECL
:
1761 if (DECL_ALIGN (t
) != 0)
1762 return DECL_ALIGN (t
);
1766 return FUNCTION_BOUNDARY
;
1772 /* Otherwise take the alignment from that of the type. */
1773 return TYPE_ALIGN (TREE_TYPE (t
));
1776 /* Return, as a tree node, the number of elements for TYPE (which is an
1777 ARRAY_TYPE) minus one. This counts only elements of the top array. */
1780 array_type_nelts (tree type
)
1782 tree index_type
, min
, max
;
1784 /* If they did it with unspecified bounds, then we should have already
1785 given an error about it before we got here. */
1786 if (! TYPE_DOMAIN (type
))
1787 return error_mark_node
;
1789 index_type
= TYPE_DOMAIN (type
);
1790 min
= TYPE_MIN_VALUE (index_type
);
1791 max
= TYPE_MAX_VALUE (index_type
);
1793 return (integer_zerop (min
)
1795 : fold_build2 (MINUS_EXPR
, TREE_TYPE (max
), max
, min
));
1798 /* If arg is static -- a reference to an object in static storage -- then
1799 return the object. This is not the same as the C meaning of `static'.
1800 If arg isn't static, return NULL. */
1805 switch (TREE_CODE (arg
))
1808 /* Nested functions are static, even though taking their address will
1809 involve a trampoline as we unnest the nested function and create
1810 the trampoline on the tree level. */
1814 return ((TREE_STATIC (arg
) || DECL_EXTERNAL (arg
))
1815 && ! DECL_THREAD_LOCAL_P (arg
)
1816 && ! DECL_DLLIMPORT_P (arg
)
1820 return ((TREE_STATIC (arg
) || DECL_EXTERNAL (arg
))
1824 return TREE_STATIC (arg
) ? arg
: NULL
;
1831 /* If the thing being referenced is not a field, then it is
1832 something language specific. */
1833 if (TREE_CODE (TREE_OPERAND (arg
, 1)) != FIELD_DECL
)
1834 return (*lang_hooks
.staticp
) (arg
);
1836 /* If we are referencing a bitfield, we can't evaluate an
1837 ADDR_EXPR at compile time and so it isn't a constant. */
1838 if (DECL_BIT_FIELD (TREE_OPERAND (arg
, 1)))
1841 return staticp (TREE_OPERAND (arg
, 0));
1846 case MISALIGNED_INDIRECT_REF
:
1847 case ALIGN_INDIRECT_REF
:
1849 return TREE_CONSTANT (TREE_OPERAND (arg
, 0)) ? arg
: NULL
;
1852 case ARRAY_RANGE_REF
:
1853 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg
))) == INTEGER_CST
1854 && TREE_CODE (TREE_OPERAND (arg
, 1)) == INTEGER_CST
)
1855 return staticp (TREE_OPERAND (arg
, 0));
1860 if ((unsigned int) TREE_CODE (arg
)
1861 >= (unsigned int) LAST_AND_UNUSED_TREE_CODE
)
1862 return lang_hooks
.staticp (arg
);
1868 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
1869 Do this to any expression which may be used in more than one place,
1870 but must be evaluated only once.
1872 Normally, expand_expr would reevaluate the expression each time.
1873 Calling save_expr produces something that is evaluated and recorded
1874 the first time expand_expr is called on it. Subsequent calls to
1875 expand_expr just reuse the recorded value.
1877 The call to expand_expr that generates code that actually computes
1878 the value is the first call *at compile time*. Subsequent calls
1879 *at compile time* generate code to use the saved value.
1880 This produces correct result provided that *at run time* control
1881 always flows through the insns made by the first expand_expr
1882 before reaching the other places where the save_expr was evaluated.
1883 You, the caller of save_expr, must make sure this is so.
1885 Constants, and certain read-only nodes, are returned with no
1886 SAVE_EXPR because that is safe. Expressions containing placeholders
1887 are not touched; see tree.def for an explanation of what these
1891 save_expr (tree expr
)
1893 tree t
= fold (expr
);
1896 /* If the tree evaluates to a constant, then we don't want to hide that
1897 fact (i.e. this allows further folding, and direct checks for constants).
1898 However, a read-only object that has side effects cannot be bypassed.
1899 Since it is no problem to reevaluate literals, we just return the
1901 inner
= skip_simple_arithmetic (t
);
1903 if (TREE_INVARIANT (inner
)
1904 || (TREE_READONLY (inner
) && ! TREE_SIDE_EFFECTS (inner
))
1905 || TREE_CODE (inner
) == SAVE_EXPR
1906 || TREE_CODE (inner
) == ERROR_MARK
)
1909 /* If INNER contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
1910 it means that the size or offset of some field of an object depends on
1911 the value within another field.
1913 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
1914 and some variable since it would then need to be both evaluated once and
1915 evaluated more than once. Front-ends must assure this case cannot
1916 happen by surrounding any such subexpressions in their own SAVE_EXPR
1917 and forcing evaluation at the proper time. */
1918 if (contains_placeholder_p (inner
))
1921 t
= build1 (SAVE_EXPR
, TREE_TYPE (expr
), t
);
1923 /* This expression might be placed ahead of a jump to ensure that the
1924 value was computed on both sides of the jump. So make sure it isn't
1925 eliminated as dead. */
1926 TREE_SIDE_EFFECTS (t
) = 1;
1927 TREE_INVARIANT (t
) = 1;
1931 /* Look inside EXPR and into any simple arithmetic operations. Return
1932 the innermost non-arithmetic node. */
1935 skip_simple_arithmetic (tree expr
)
1939 /* We don't care about whether this can be used as an lvalue in this
1941 while (TREE_CODE (expr
) == NON_LVALUE_EXPR
)
1942 expr
= TREE_OPERAND (expr
, 0);
1944 /* If we have simple operations applied to a SAVE_EXPR or to a SAVE_EXPR and
1945 a constant, it will be more efficient to not make another SAVE_EXPR since
1946 it will allow better simplification and GCSE will be able to merge the
1947 computations if they actually occur. */
1951 if (UNARY_CLASS_P (inner
))
1952 inner
= TREE_OPERAND (inner
, 0);
1953 else if (BINARY_CLASS_P (inner
))
1955 if (TREE_INVARIANT (TREE_OPERAND (inner
, 1)))
1956 inner
= TREE_OPERAND (inner
, 0);
1957 else if (TREE_INVARIANT (TREE_OPERAND (inner
, 0)))
1958 inner
= TREE_OPERAND (inner
, 1);
1969 /* Return which tree structure is used by T. */
1971 enum tree_node_structure_enum
1972 tree_node_structure (tree t
)
1974 enum tree_code code
= TREE_CODE (t
);
1976 switch (TREE_CODE_CLASS (code
))
1978 case tcc_declaration
:
1983 return TS_FIELD_DECL
;
1985 return TS_PARM_DECL
;
1989 return TS_LABEL_DECL
;
1991 return TS_RESULT_DECL
;
1993 return TS_CONST_DECL
;
1995 return TS_TYPE_DECL
;
1997 return TS_FUNCTION_DECL
;
1998 case TYPE_MEMORY_TAG
:
1999 case NAME_MEMORY_TAG
:
2000 case STRUCT_FIELD_TAG
:
2001 return TS_MEMORY_TAG
;
2003 return TS_DECL_NON_COMMON
;
2009 case tcc_comparison
:
2012 case tcc_expression
:
2015 default: /* tcc_constant and tcc_exceptional */
2020 /* tcc_constant cases. */
2021 case INTEGER_CST
: return TS_INT_CST
;
2022 case REAL_CST
: return TS_REAL_CST
;
2023 case COMPLEX_CST
: return TS_COMPLEX
;
2024 case VECTOR_CST
: return TS_VECTOR
;
2025 case STRING_CST
: return TS_STRING
;
2026 /* tcc_exceptional cases. */
2027 case ERROR_MARK
: return TS_COMMON
;
2028 case IDENTIFIER_NODE
: return TS_IDENTIFIER
;
2029 case TREE_LIST
: return TS_LIST
;
2030 case TREE_VEC
: return TS_VEC
;
2031 case PHI_NODE
: return TS_PHI_NODE
;
2032 case SSA_NAME
: return TS_SSA_NAME
;
2033 case PLACEHOLDER_EXPR
: return TS_COMMON
;
2034 case STATEMENT_LIST
: return TS_STATEMENT_LIST
;
2035 case BLOCK
: return TS_BLOCK
;
2036 case CONSTRUCTOR
: return TS_CONSTRUCTOR
;
2037 case TREE_BINFO
: return TS_BINFO
;
2038 case VALUE_HANDLE
: return TS_VALUE_HANDLE
;
2045 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
2046 or offset that depends on a field within a record. */
2049 contains_placeholder_p (tree exp
)
2051 enum tree_code code
;
2056 code
= TREE_CODE (exp
);
2057 if (code
== PLACEHOLDER_EXPR
)
2060 switch (TREE_CODE_CLASS (code
))
2063 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
2064 position computations since they will be converted into a
2065 WITH_RECORD_EXPR involving the reference, which will assume
2066 here will be valid. */
2067 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0));
2069 case tcc_exceptional
:
2070 if (code
== TREE_LIST
)
2071 return (CONTAINS_PLACEHOLDER_P (TREE_VALUE (exp
))
2072 || CONTAINS_PLACEHOLDER_P (TREE_CHAIN (exp
)));
2077 case tcc_comparison
:
2078 case tcc_expression
:
2082 /* Ignoring the first operand isn't quite right, but works best. */
2083 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1));
2086 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0))
2087 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1))
2088 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 2)));
2091 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1));
2097 switch (TREE_CODE_LENGTH (code
))
2100 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0));
2102 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0))
2103 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1)));
2114 /* Return true if any part of the computation of TYPE involves a
2115 PLACEHOLDER_EXPR. This includes size, bounds, qualifiers
2116 (for QUAL_UNION_TYPE) and field positions. */
2119 type_contains_placeholder_1 (tree type
)
2121 /* If the size contains a placeholder or the parent type (component type in
2122 the case of arrays) type involves a placeholder, this type does. */
2123 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type
))
2124 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (type
))
2125 || (TREE_TYPE (type
) != 0
2126 && type_contains_placeholder_p (TREE_TYPE (type
))))
2129 /* Now do type-specific checks. Note that the last part of the check above
2130 greatly limits what we have to do below. */
2131 switch (TREE_CODE (type
))
2140 case REFERENCE_TYPE
:
2148 /* Here we just check the bounds. */
2149 return (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (type
))
2150 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (type
)));
2153 /* We're already checked the component type (TREE_TYPE), so just check
2155 return type_contains_placeholder_p (TYPE_DOMAIN (type
));
2159 case QUAL_UNION_TYPE
:
2163 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
2164 if (TREE_CODE (field
) == FIELD_DECL
2165 && (CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (field
))
2166 || (TREE_CODE (type
) == QUAL_UNION_TYPE
2167 && CONTAINS_PLACEHOLDER_P (DECL_QUALIFIER (field
)))
2168 || type_contains_placeholder_p (TREE_TYPE (field
))))
2180 type_contains_placeholder_p (tree type
)
2184 /* If the contains_placeholder_bits field has been initialized,
2185 then we know the answer. */
2186 if (TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) > 0)
2187 return TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) - 1;
2189 /* Indicate that we've seen this type node, and the answer is false.
2190 This is what we want to return if we run into recursion via fields. */
2191 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) = 1;
2193 /* Compute the real value. */
2194 result
= type_contains_placeholder_1 (type
);
2196 /* Store the real value. */
2197 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) = result
+ 1;
2202 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
2203 return a tree with all occurrences of references to F in a
2204 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
2205 contains only arithmetic expressions or a CALL_EXPR with a
2206 PLACEHOLDER_EXPR occurring only in its arglist. */
2209 substitute_in_expr (tree exp
, tree f
, tree r
)
2211 enum tree_code code
= TREE_CODE (exp
);
2212 tree op0
, op1
, op2
, op3
;
2216 /* We handle TREE_LIST and COMPONENT_REF separately. */
2217 if (code
== TREE_LIST
)
2219 op0
= SUBSTITUTE_IN_EXPR (TREE_CHAIN (exp
), f
, r
);
2220 op1
= SUBSTITUTE_IN_EXPR (TREE_VALUE (exp
), f
, r
);
2221 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
2224 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
2226 else if (code
== COMPONENT_REF
)
2228 /* If this expression is getting a value from a PLACEHOLDER_EXPR
2229 and it is the right field, replace it with R. */
2230 for (inner
= TREE_OPERAND (exp
, 0);
2231 REFERENCE_CLASS_P (inner
);
2232 inner
= TREE_OPERAND (inner
, 0))
2234 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
2235 && TREE_OPERAND (exp
, 1) == f
)
2238 /* If this expression hasn't been completed let, leave it alone. */
2239 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
&& TREE_TYPE (inner
) == 0)
2242 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2243 if (op0
== TREE_OPERAND (exp
, 0))
2246 new = fold_build3 (COMPONENT_REF
, TREE_TYPE (exp
),
2247 op0
, TREE_OPERAND (exp
, 1), NULL_TREE
);
2250 switch (TREE_CODE_CLASS (code
))
2253 case tcc_declaration
:
2256 case tcc_exceptional
:
2259 case tcc_comparison
:
2260 case tcc_expression
:
2262 switch (TREE_CODE_LENGTH (code
))
2268 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2269 if (op0
== TREE_OPERAND (exp
, 0))
2272 new = fold_build1 (code
, TREE_TYPE (exp
), op0
);
2276 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2277 op1
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 1), f
, r
);
2279 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
2282 new = fold_build2 (code
, TREE_TYPE (exp
), op0
, op1
);
2286 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2287 op1
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 1), f
, r
);
2288 op2
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 2), f
, r
);
2290 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2291 && op2
== TREE_OPERAND (exp
, 2))
2294 new = fold_build3 (code
, TREE_TYPE (exp
), op0
, op1
, op2
);
2298 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2299 op1
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 1), f
, r
);
2300 op2
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 2), f
, r
);
2301 op3
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 3), f
, r
);
2303 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2304 && op2
== TREE_OPERAND (exp
, 2)
2305 && op3
== TREE_OPERAND (exp
, 3))
2308 new = fold (build4 (code
, TREE_TYPE (exp
), op0
, op1
, op2
, op3
));
2320 TREE_READONLY (new) = TREE_READONLY (exp
);
2324 /* Similar, but look for a PLACEHOLDER_EXPR in EXP and find a replacement
2325 for it within OBJ, a tree that is an object or a chain of references. */
2328 substitute_placeholder_in_expr (tree exp
, tree obj
)
2330 enum tree_code code
= TREE_CODE (exp
);
2331 tree op0
, op1
, op2
, op3
;
2333 /* If this is a PLACEHOLDER_EXPR, see if we find a corresponding type
2334 in the chain of OBJ. */
2335 if (code
== PLACEHOLDER_EXPR
)
2337 tree need_type
= TYPE_MAIN_VARIANT (TREE_TYPE (exp
));
2340 for (elt
= obj
; elt
!= 0;
2341 elt
= ((TREE_CODE (elt
) == COMPOUND_EXPR
2342 || TREE_CODE (elt
) == COND_EXPR
)
2343 ? TREE_OPERAND (elt
, 1)
2344 : (REFERENCE_CLASS_P (elt
)
2345 || UNARY_CLASS_P (elt
)
2346 || BINARY_CLASS_P (elt
)
2347 || EXPRESSION_CLASS_P (elt
))
2348 ? TREE_OPERAND (elt
, 0) : 0))
2349 if (TYPE_MAIN_VARIANT (TREE_TYPE (elt
)) == need_type
)
2352 for (elt
= obj
; elt
!= 0;
2353 elt
= ((TREE_CODE (elt
) == COMPOUND_EXPR
2354 || TREE_CODE (elt
) == COND_EXPR
)
2355 ? TREE_OPERAND (elt
, 1)
2356 : (REFERENCE_CLASS_P (elt
)
2357 || UNARY_CLASS_P (elt
)
2358 || BINARY_CLASS_P (elt
)
2359 || EXPRESSION_CLASS_P (elt
))
2360 ? TREE_OPERAND (elt
, 0) : 0))
2361 if (POINTER_TYPE_P (TREE_TYPE (elt
))
2362 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (elt
)))
2364 return fold_build1 (INDIRECT_REF
, need_type
, elt
);
2366 /* If we didn't find it, return the original PLACEHOLDER_EXPR. If it
2367 survives until RTL generation, there will be an error. */
2371 /* TREE_LIST is special because we need to look at TREE_VALUE
2372 and TREE_CHAIN, not TREE_OPERANDS. */
2373 else if (code
== TREE_LIST
)
2375 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp
), obj
);
2376 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp
), obj
);
2377 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
2380 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
2383 switch (TREE_CODE_CLASS (code
))
2386 case tcc_declaration
:
2389 case tcc_exceptional
:
2392 case tcc_comparison
:
2393 case tcc_expression
:
2396 switch (TREE_CODE_LENGTH (code
))
2402 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2403 if (op0
== TREE_OPERAND (exp
, 0))
2406 return fold_build1 (code
, TREE_TYPE (exp
), op0
);
2409 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2410 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2412 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
2415 return fold_build2 (code
, TREE_TYPE (exp
), op0
, op1
);
2418 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2419 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2420 op2
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 2), obj
);
2422 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2423 && op2
== TREE_OPERAND (exp
, 2))
2426 return fold_build3 (code
, TREE_TYPE (exp
), op0
, op1
, op2
);
2429 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2430 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2431 op2
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 2), obj
);
2432 op3
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 3), obj
);
2434 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2435 && op2
== TREE_OPERAND (exp
, 2)
2436 && op3
== TREE_OPERAND (exp
, 3))
2439 return fold (build4 (code
, TREE_TYPE (exp
), op0
, op1
, op2
, op3
));
2451 /* Stabilize a reference so that we can use it any number of times
2452 without causing its operands to be evaluated more than once.
2453 Returns the stabilized reference. This works by means of save_expr,
2454 so see the caveats in the comments about save_expr.
2456 Also allows conversion expressions whose operands are references.
2457 Any other kind of expression is returned unchanged. */
2460 stabilize_reference (tree ref
)
2463 enum tree_code code
= TREE_CODE (ref
);
2470 /* No action is needed in this case. */
2476 case FIX_TRUNC_EXPR
:
2477 case FIX_FLOOR_EXPR
:
2478 case FIX_ROUND_EXPR
:
2480 result
= build_nt (code
, stabilize_reference (TREE_OPERAND (ref
, 0)));
2484 result
= build_nt (INDIRECT_REF
,
2485 stabilize_reference_1 (TREE_OPERAND (ref
, 0)));
2489 result
= build_nt (COMPONENT_REF
,
2490 stabilize_reference (TREE_OPERAND (ref
, 0)),
2491 TREE_OPERAND (ref
, 1), NULL_TREE
);
2495 result
= build_nt (BIT_FIELD_REF
,
2496 stabilize_reference (TREE_OPERAND (ref
, 0)),
2497 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2498 stabilize_reference_1 (TREE_OPERAND (ref
, 2)));
2502 result
= build_nt (ARRAY_REF
,
2503 stabilize_reference (TREE_OPERAND (ref
, 0)),
2504 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2505 TREE_OPERAND (ref
, 2), TREE_OPERAND (ref
, 3));
2508 case ARRAY_RANGE_REF
:
2509 result
= build_nt (ARRAY_RANGE_REF
,
2510 stabilize_reference (TREE_OPERAND (ref
, 0)),
2511 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2512 TREE_OPERAND (ref
, 2), TREE_OPERAND (ref
, 3));
2516 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2517 it wouldn't be ignored. This matters when dealing with
2519 return stabilize_reference_1 (ref
);
2521 /* If arg isn't a kind of lvalue we recognize, make no change.
2522 Caller should recognize the error for an invalid lvalue. */
2527 return error_mark_node
;
2530 TREE_TYPE (result
) = TREE_TYPE (ref
);
2531 TREE_READONLY (result
) = TREE_READONLY (ref
);
2532 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (ref
);
2533 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (ref
);
2538 /* Subroutine of stabilize_reference; this is called for subtrees of
2539 references. Any expression with side-effects must be put in a SAVE_EXPR
2540 to ensure that it is only evaluated once.
2542 We don't put SAVE_EXPR nodes around everything, because assigning very
2543 simple expressions to temporaries causes us to miss good opportunities
2544 for optimizations. Among other things, the opportunity to fold in the
2545 addition of a constant into an addressing mode often gets lost, e.g.
2546 "y[i+1] += x;". In general, we take the approach that we should not make
2547 an assignment unless we are forced into it - i.e., that any non-side effect
2548 operator should be allowed, and that cse should take care of coalescing
2549 multiple utterances of the same expression should that prove fruitful. */
2552 stabilize_reference_1 (tree e
)
2555 enum tree_code code
= TREE_CODE (e
);
2557 /* We cannot ignore const expressions because it might be a reference
2558 to a const array but whose index contains side-effects. But we can
2559 ignore things that are actual constant or that already have been
2560 handled by this function. */
2562 if (TREE_INVARIANT (e
))
2565 switch (TREE_CODE_CLASS (code
))
2567 case tcc_exceptional
:
2569 case tcc_declaration
:
2570 case tcc_comparison
:
2572 case tcc_expression
:
2574 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2575 so that it will only be evaluated once. */
2576 /* The reference (r) and comparison (<) classes could be handled as
2577 below, but it is generally faster to only evaluate them once. */
2578 if (TREE_SIDE_EFFECTS (e
))
2579 return save_expr (e
);
2583 /* Constants need no processing. In fact, we should never reach
2588 /* Division is slow and tends to be compiled with jumps,
2589 especially the division by powers of 2 that is often
2590 found inside of an array reference. So do it just once. */
2591 if (code
== TRUNC_DIV_EXPR
|| code
== TRUNC_MOD_EXPR
2592 || code
== FLOOR_DIV_EXPR
|| code
== FLOOR_MOD_EXPR
2593 || code
== CEIL_DIV_EXPR
|| code
== CEIL_MOD_EXPR
2594 || code
== ROUND_DIV_EXPR
|| code
== ROUND_MOD_EXPR
)
2595 return save_expr (e
);
2596 /* Recursively stabilize each operand. */
2597 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)),
2598 stabilize_reference_1 (TREE_OPERAND (e
, 1)));
2602 /* Recursively stabilize each operand. */
2603 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)));
2610 TREE_TYPE (result
) = TREE_TYPE (e
);
2611 TREE_READONLY (result
) = TREE_READONLY (e
);
2612 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (e
);
2613 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (e
);
2614 TREE_INVARIANT (result
) = 1;
2619 /* Low-level constructors for expressions. */
2621 /* A helper function for build1 and constant folders. Set TREE_CONSTANT,
2622 TREE_INVARIANT, and TREE_SIDE_EFFECTS for an ADDR_EXPR. */
2625 recompute_tree_invariant_for_addr_expr (tree t
)
2628 bool tc
= true, ti
= true, se
= false;
2630 /* We started out assuming this address is both invariant and constant, but
2631 does not have side effects. Now go down any handled components and see if
2632 any of them involve offsets that are either non-constant or non-invariant.
2633 Also check for side-effects.
2635 ??? Note that this code makes no attempt to deal with the case where
2636 taking the address of something causes a copy due to misalignment. */
2638 #define UPDATE_TITCSE(NODE) \
2639 do { tree _node = (NODE); \
2640 if (_node && !TREE_INVARIANT (_node)) ti = false; \
2641 if (_node && !TREE_CONSTANT (_node)) tc = false; \
2642 if (_node && TREE_SIDE_EFFECTS (_node)) se = true; } while (0)
2644 for (node
= TREE_OPERAND (t
, 0); handled_component_p (node
);
2645 node
= TREE_OPERAND (node
, 0))
2647 /* If the first operand doesn't have an ARRAY_TYPE, this is a bogus
2648 array reference (probably made temporarily by the G++ front end),
2649 so ignore all the operands. */
2650 if ((TREE_CODE (node
) == ARRAY_REF
2651 || TREE_CODE (node
) == ARRAY_RANGE_REF
)
2652 && TREE_CODE (TREE_TYPE (TREE_OPERAND (node
, 0))) == ARRAY_TYPE
)
2654 UPDATE_TITCSE (TREE_OPERAND (node
, 1));
2655 if (TREE_OPERAND (node
, 2))
2656 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2657 if (TREE_OPERAND (node
, 3))
2658 UPDATE_TITCSE (TREE_OPERAND (node
, 3));
2660 /* Likewise, just because this is a COMPONENT_REF doesn't mean we have a
2661 FIELD_DECL, apparently. The G++ front end can put something else
2662 there, at least temporarily. */
2663 else if (TREE_CODE (node
) == COMPONENT_REF
2664 && TREE_CODE (TREE_OPERAND (node
, 1)) == FIELD_DECL
)
2666 if (TREE_OPERAND (node
, 2))
2667 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2669 else if (TREE_CODE (node
) == BIT_FIELD_REF
)
2670 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2673 node
= lang_hooks
.expr_to_decl (node
, &tc
, &ti
, &se
);
2675 /* Now see what's inside. If it's an INDIRECT_REF, copy our properties from
2676 the address, since &(*a)->b is a form of addition. If it's a decl, it's
2677 invariant and constant if the decl is static. It's also invariant if it's
2678 a decl in the current function. Taking the address of a volatile variable
2679 is not volatile. If it's a constant, the address is both invariant and
2680 constant. Otherwise it's neither. */
2681 if (TREE_CODE (node
) == INDIRECT_REF
)
2682 UPDATE_TITCSE (TREE_OPERAND (node
, 0));
2683 else if (DECL_P (node
))
2687 else if (decl_function_context (node
) == current_function_decl
2688 /* Addresses of thread-local variables are invariant. */
2689 || (TREE_CODE (node
) == VAR_DECL
2690 && DECL_THREAD_LOCAL_P (node
)))
2695 else if (CONSTANT_CLASS_P (node
))
2700 se
|= TREE_SIDE_EFFECTS (node
);
2703 TREE_CONSTANT (t
) = tc
;
2704 TREE_INVARIANT (t
) = ti
;
2705 TREE_SIDE_EFFECTS (t
) = se
;
2706 #undef UPDATE_TITCSE
2709 /* Build an expression of code CODE, data type TYPE, and operands as
2710 specified. Expressions and reference nodes can be created this way.
2711 Constants, decls, types and misc nodes cannot be.
2713 We define 5 non-variadic functions, from 0 to 4 arguments. This is
2714 enough for all extant tree codes. */
2717 build0_stat (enum tree_code code
, tree tt MEM_STAT_DECL
)
2721 gcc_assert (TREE_CODE_LENGTH (code
) == 0);
2723 t
= make_node_stat (code PASS_MEM_STAT
);
2730 build1_stat (enum tree_code code
, tree type
, tree node MEM_STAT_DECL
)
2732 int length
= sizeof (struct tree_exp
);
2733 #ifdef GATHER_STATISTICS
2734 tree_node_kind kind
;
2738 #ifdef GATHER_STATISTICS
2739 switch (TREE_CODE_CLASS (code
))
2741 case tcc_statement
: /* an expression with side effects */
2744 case tcc_reference
: /* a reference */
2752 tree_node_counts
[(int) kind
]++;
2753 tree_node_sizes
[(int) kind
] += length
;
2756 gcc_assert (TREE_CODE_LENGTH (code
) == 1);
2758 t
= ggc_alloc_zone_pass_stat (length
, &tree_zone
);
2760 memset (t
, 0, sizeof (struct tree_common
));
2762 TREE_SET_CODE (t
, code
);
2764 TREE_TYPE (t
) = type
;
2765 #ifdef USE_MAPPED_LOCATION
2766 SET_EXPR_LOCATION (t
, UNKNOWN_LOCATION
);
2768 SET_EXPR_LOCUS (t
, NULL
);
2770 TREE_COMPLEXITY (t
) = 0;
2771 TREE_OPERAND (t
, 0) = node
;
2772 TREE_BLOCK (t
) = NULL_TREE
;
2773 if (node
&& !TYPE_P (node
))
2775 TREE_SIDE_EFFECTS (t
) = TREE_SIDE_EFFECTS (node
);
2776 TREE_READONLY (t
) = TREE_READONLY (node
);
2779 if (TREE_CODE_CLASS (code
) == tcc_statement
)
2780 TREE_SIDE_EFFECTS (t
) = 1;
2784 /* All of these have side-effects, no matter what their
2786 TREE_SIDE_EFFECTS (t
) = 1;
2787 TREE_READONLY (t
) = 0;
2790 case MISALIGNED_INDIRECT_REF
:
2791 case ALIGN_INDIRECT_REF
:
2793 /* Whether a dereference is readonly has nothing to do with whether
2794 its operand is readonly. */
2795 TREE_READONLY (t
) = 0;
2800 recompute_tree_invariant_for_addr_expr (t
);
2804 if (TREE_CODE_CLASS (code
) == tcc_unary
2805 && node
&& !TYPE_P (node
)
2806 && TREE_CONSTANT (node
))
2807 TREE_CONSTANT (t
) = 1;
2808 if (TREE_CODE_CLASS (code
) == tcc_unary
2809 && node
&& TREE_INVARIANT (node
))
2810 TREE_INVARIANT (t
) = 1;
2811 if (TREE_CODE_CLASS (code
) == tcc_reference
2812 && node
&& TREE_THIS_VOLATILE (node
))
2813 TREE_THIS_VOLATILE (t
) = 1;
2820 #define PROCESS_ARG(N) \
2822 TREE_OPERAND (t, N) = arg##N; \
2823 if (arg##N &&!TYPE_P (arg##N)) \
2825 if (TREE_SIDE_EFFECTS (arg##N)) \
2827 if (!TREE_READONLY (arg##N)) \
2829 if (!TREE_CONSTANT (arg##N)) \
2831 if (!TREE_INVARIANT (arg##N)) \
2837 build2_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1 MEM_STAT_DECL
)
2839 bool constant
, read_only
, side_effects
, invariant
;
2842 gcc_assert (TREE_CODE_LENGTH (code
) == 2);
2844 t
= make_node_stat (code PASS_MEM_STAT
);
2847 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
2848 result based on those same flags for the arguments. But if the
2849 arguments aren't really even `tree' expressions, we shouldn't be trying
2852 /* Expressions without side effects may be constant if their
2853 arguments are as well. */
2854 constant
= (TREE_CODE_CLASS (code
) == tcc_comparison
2855 || TREE_CODE_CLASS (code
) == tcc_binary
);
2857 side_effects
= TREE_SIDE_EFFECTS (t
);
2858 invariant
= constant
;
2863 TREE_READONLY (t
) = read_only
;
2864 TREE_CONSTANT (t
) = constant
;
2865 TREE_INVARIANT (t
) = invariant
;
2866 TREE_SIDE_EFFECTS (t
) = side_effects
;
2867 TREE_THIS_VOLATILE (t
)
2868 = (TREE_CODE_CLASS (code
) == tcc_reference
2869 && arg0
&& TREE_THIS_VOLATILE (arg0
));
2875 build3_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
2876 tree arg2 MEM_STAT_DECL
)
2878 bool constant
, read_only
, side_effects
, invariant
;
2881 gcc_assert (TREE_CODE_LENGTH (code
) == 3);
2883 t
= make_node_stat (code PASS_MEM_STAT
);
2886 side_effects
= TREE_SIDE_EFFECTS (t
);
2892 if (code
== CALL_EXPR
&& !side_effects
)
2897 /* Calls have side-effects, except those to const or
2899 i
= call_expr_flags (t
);
2900 if (!(i
& (ECF_CONST
| ECF_PURE
)))
2903 /* And even those have side-effects if their arguments do. */
2904 else for (node
= arg1
; node
; node
= TREE_CHAIN (node
))
2905 if (TREE_SIDE_EFFECTS (TREE_VALUE (node
)))
2912 TREE_SIDE_EFFECTS (t
) = side_effects
;
2913 TREE_THIS_VOLATILE (t
)
2914 = (TREE_CODE_CLASS (code
) == tcc_reference
2915 && arg0
&& TREE_THIS_VOLATILE (arg0
));
2921 build4_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
2922 tree arg2
, tree arg3 MEM_STAT_DECL
)
2924 bool constant
, read_only
, side_effects
, invariant
;
2927 gcc_assert (TREE_CODE_LENGTH (code
) == 4);
2929 t
= make_node_stat (code PASS_MEM_STAT
);
2932 side_effects
= TREE_SIDE_EFFECTS (t
);
2939 TREE_SIDE_EFFECTS (t
) = side_effects
;
2940 TREE_THIS_VOLATILE (t
)
2941 = (TREE_CODE_CLASS (code
) == tcc_reference
2942 && arg0
&& TREE_THIS_VOLATILE (arg0
));
2948 build7_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
2949 tree arg2
, tree arg3
, tree arg4
, tree arg5
,
2950 tree arg6 MEM_STAT_DECL
)
2952 bool constant
, read_only
, side_effects
, invariant
;
2955 gcc_assert (code
== TARGET_MEM_REF
);
2957 t
= make_node_stat (code PASS_MEM_STAT
);
2960 side_effects
= TREE_SIDE_EFFECTS (t
);
2970 TREE_SIDE_EFFECTS (t
) = side_effects
;
2971 TREE_THIS_VOLATILE (t
) = 0;
2976 /* Similar except don't specify the TREE_TYPE
2977 and leave the TREE_SIDE_EFFECTS as 0.
2978 It is permissible for arguments to be null,
2979 or even garbage if their values do not matter. */
2982 build_nt (enum tree_code code
, ...)
2991 t
= make_node (code
);
2992 length
= TREE_CODE_LENGTH (code
);
2994 for (i
= 0; i
< length
; i
++)
2995 TREE_OPERAND (t
, i
) = va_arg (p
, tree
);
3001 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
3002 We do NOT enter this node in any sort of symbol table.
3004 layout_decl is used to set up the decl's storage layout.
3005 Other slots are initialized to 0 or null pointers. */
3008 build_decl_stat (enum tree_code code
, tree name
, tree type MEM_STAT_DECL
)
3012 t
= make_node_stat (code PASS_MEM_STAT
);
3014 /* if (type == error_mark_node)
3015 type = integer_type_node; */
3016 /* That is not done, deliberately, so that having error_mark_node
3017 as the type can suppress useless errors in the use of this variable. */
3019 DECL_NAME (t
) = name
;
3020 TREE_TYPE (t
) = type
;
3022 if (code
== VAR_DECL
|| code
== PARM_DECL
|| code
== RESULT_DECL
)
3024 else if (code
== FUNCTION_DECL
)
3025 DECL_MODE (t
) = FUNCTION_MODE
;
3027 if (CODE_CONTAINS_STRUCT (code
, TS_DECL_WITH_VIS
))
3029 /* Set default visibility to whatever the user supplied with
3030 visibility_specified depending on #pragma GCC visibility. */
3031 DECL_VISIBILITY (t
) = default_visibility
;
3032 DECL_VISIBILITY_SPECIFIED (t
) = visibility_options
.inpragma
;
3038 /* Builds and returns function declaration with NAME and TYPE. */
3041 build_fn_decl (const char *name
, tree type
)
3043 tree id
= get_identifier (name
);
3044 tree decl
= build_decl (FUNCTION_DECL
, id
, type
);
3046 DECL_EXTERNAL (decl
) = 1;
3047 TREE_PUBLIC (decl
) = 1;
3048 DECL_ARTIFICIAL (decl
) = 1;
3049 TREE_NOTHROW (decl
) = 1;
3055 /* BLOCK nodes are used to represent the structure of binding contours
3056 and declarations, once those contours have been exited and their contents
3057 compiled. This information is used for outputting debugging info. */
3060 build_block (tree vars
, tree subblocks
, tree supercontext
, tree chain
)
3062 tree block
= make_node (BLOCK
);
3064 BLOCK_VARS (block
) = vars
;
3065 BLOCK_SUBBLOCKS (block
) = subblocks
;
3066 BLOCK_SUPERCONTEXT (block
) = supercontext
;
3067 BLOCK_CHAIN (block
) = chain
;
3071 #if 1 /* ! defined(USE_MAPPED_LOCATION) */
3072 /* ??? gengtype doesn't handle conditionals */
3073 static GTY(()) location_t
*last_annotated_node
;
3076 #ifdef USE_MAPPED_LOCATION
3079 expand_location (source_location loc
)
3081 expanded_location xloc
;
3082 if (loc
== 0) { xloc
.file
= NULL
; xloc
.line
= 0; xloc
.column
= 0; }
3085 const struct line_map
*map
= linemap_lookup (&line_table
, loc
);
3086 xloc
.file
= map
->to_file
;
3087 xloc
.line
= SOURCE_LINE (map
, loc
);
3088 xloc
.column
= SOURCE_COLUMN (map
, loc
);
3095 /* Record the exact location where an expression or an identifier were
3099 annotate_with_file_line (tree node
, const char *file
, int line
)
3101 /* Roughly one percent of the calls to this function are to annotate
3102 a node with the same information already attached to that node!
3103 Just return instead of wasting memory. */
3104 if (EXPR_LOCUS (node
)
3105 && EXPR_LINENO (node
) == line
3106 && (EXPR_FILENAME (node
) == file
3107 || !strcmp (EXPR_FILENAME (node
), file
)))
3109 last_annotated_node
= EXPR_LOCUS (node
);
3113 /* In heavily macroized code (such as GCC itself) this single
3114 entry cache can reduce the number of allocations by more
3116 if (last_annotated_node
3117 && last_annotated_node
->line
== line
3118 && (last_annotated_node
->file
== file
3119 || !strcmp (last_annotated_node
->file
, file
)))
3121 SET_EXPR_LOCUS (node
, last_annotated_node
);
3125 SET_EXPR_LOCUS (node
, ggc_alloc (sizeof (location_t
)));
3126 EXPR_LINENO (node
) = line
;
3127 EXPR_FILENAME (node
) = file
;
3128 last_annotated_node
= EXPR_LOCUS (node
);
3132 annotate_with_locus (tree node
, location_t locus
)
3134 annotate_with_file_line (node
, locus
.file
, locus
.line
);
3138 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
3142 build_decl_attribute_variant (tree ddecl
, tree attribute
)
3144 DECL_ATTRIBUTES (ddecl
) = attribute
;
3148 /* Borrowed from hashtab.c iterative_hash implementation. */
3149 #define mix(a,b,c) \
3151 a -= b; a -= c; a ^= (c>>13); \
3152 b -= c; b -= a; b ^= (a<< 8); \
3153 c -= a; c -= b; c ^= ((b&0xffffffff)>>13); \
3154 a -= b; a -= c; a ^= ((c&0xffffffff)>>12); \
3155 b -= c; b -= a; b = (b ^ (a<<16)) & 0xffffffff; \
3156 c -= a; c -= b; c = (c ^ (b>> 5)) & 0xffffffff; \
3157 a -= b; a -= c; a = (a ^ (c>> 3)) & 0xffffffff; \
3158 b -= c; b -= a; b = (b ^ (a<<10)) & 0xffffffff; \
3159 c -= a; c -= b; c = (c ^ (b>>15)) & 0xffffffff; \
3163 /* Produce good hash value combining VAL and VAL2. */
3164 static inline hashval_t
3165 iterative_hash_hashval_t (hashval_t val
, hashval_t val2
)
3167 /* the golden ratio; an arbitrary value. */
3168 hashval_t a
= 0x9e3779b9;
3174 /* Produce good hash value combining PTR and VAL2. */
3175 static inline hashval_t
3176 iterative_hash_pointer (void *ptr
, hashval_t val2
)
3178 if (sizeof (ptr
) == sizeof (hashval_t
))
3179 return iterative_hash_hashval_t ((size_t) ptr
, val2
);
3182 hashval_t a
= (hashval_t
) (size_t) ptr
;
3183 /* Avoid warnings about shifting of more than the width of the type on
3184 hosts that won't execute this path. */
3186 hashval_t b
= (hashval_t
) ((size_t) ptr
>> (sizeof (hashval_t
) * 8 + zero
));
3192 /* Produce good hash value combining VAL and VAL2. */
3193 static inline hashval_t
3194 iterative_hash_host_wide_int (HOST_WIDE_INT val
, hashval_t val2
)
3196 if (sizeof (HOST_WIDE_INT
) == sizeof (hashval_t
))
3197 return iterative_hash_hashval_t (val
, val2
);
3200 hashval_t a
= (hashval_t
) val
;
3201 /* Avoid warnings about shifting of more than the width of the type on
3202 hosts that won't execute this path. */
3204 hashval_t b
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 8 + zero
));
3206 if (sizeof (HOST_WIDE_INT
) > 2 * sizeof (hashval_t
))
3208 hashval_t a
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 16 + zero
));
3209 hashval_t b
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 24 + zero
));
3216 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
3219 Record such modified types already made so we don't make duplicates. */
3222 build_type_attribute_variant (tree ttype
, tree attribute
)
3224 if (! attribute_list_equal (TYPE_ATTRIBUTES (ttype
), attribute
))
3226 hashval_t hashcode
= 0;
3228 enum tree_code code
= TREE_CODE (ttype
);
3230 ntype
= copy_node (ttype
);
3232 TYPE_POINTER_TO (ntype
) = 0;
3233 TYPE_REFERENCE_TO (ntype
) = 0;
3234 TYPE_ATTRIBUTES (ntype
) = attribute
;
3236 /* Create a new main variant of TYPE. */
3237 TYPE_MAIN_VARIANT (ntype
) = ntype
;
3238 TYPE_NEXT_VARIANT (ntype
) = 0;
3239 set_type_quals (ntype
, TYPE_UNQUALIFIED
);
3241 hashcode
= iterative_hash_object (code
, hashcode
);
3242 if (TREE_TYPE (ntype
))
3243 hashcode
= iterative_hash_object (TYPE_HASH (TREE_TYPE (ntype
)),
3245 hashcode
= attribute_hash_list (attribute
, hashcode
);
3247 switch (TREE_CODE (ntype
))
3250 hashcode
= type_hash_list (TYPE_ARG_TYPES (ntype
), hashcode
);
3253 hashcode
= iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (ntype
)),
3257 hashcode
= iterative_hash_object
3258 (TREE_INT_CST_LOW (TYPE_MAX_VALUE (ntype
)), hashcode
);
3259 hashcode
= iterative_hash_object
3260 (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (ntype
)), hashcode
);
3264 unsigned int precision
= TYPE_PRECISION (ntype
);
3265 hashcode
= iterative_hash_object (precision
, hashcode
);
3272 ntype
= type_hash_canon (hashcode
, ntype
);
3273 ttype
= build_qualified_type (ntype
, TYPE_QUALS (ttype
));
3280 /* Return nonzero if IDENT is a valid name for attribute ATTR,
3283 We try both `text' and `__text__', ATTR may be either one. */
3284 /* ??? It might be a reasonable simplification to require ATTR to be only
3285 `text'. One might then also require attribute lists to be stored in
3286 their canonicalized form. */
3289 is_attribute_with_length_p (const char *attr
, int attr_len
, tree ident
)
3294 if (TREE_CODE (ident
) != IDENTIFIER_NODE
)
3297 p
= IDENTIFIER_POINTER (ident
);
3298 ident_len
= IDENTIFIER_LENGTH (ident
);
3300 if (ident_len
== attr_len
3301 && strcmp (attr
, p
) == 0)
3304 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
3307 gcc_assert (attr
[1] == '_');
3308 gcc_assert (attr
[attr_len
- 2] == '_');
3309 gcc_assert (attr
[attr_len
- 1] == '_');
3310 gcc_assert (attr
[1] == '_');
3311 if (ident_len
== attr_len
- 4
3312 && strncmp (attr
+ 2, p
, attr_len
- 4) == 0)
3317 if (ident_len
== attr_len
+ 4
3318 && p
[0] == '_' && p
[1] == '_'
3319 && p
[ident_len
- 2] == '_' && p
[ident_len
- 1] == '_'
3320 && strncmp (attr
, p
+ 2, attr_len
) == 0)
3327 /* Return nonzero if IDENT is a valid name for attribute ATTR,
3330 We try both `text' and `__text__', ATTR may be either one. */
3333 is_attribute_p (const char *attr
, tree ident
)
3335 return is_attribute_with_length_p (attr
, strlen (attr
), ident
);
3338 /* Given an attribute name and a list of attributes, return a pointer to the
3339 attribute's list element if the attribute is part of the list, or NULL_TREE
3340 if not found. If the attribute appears more than once, this only
3341 returns the first occurrence; the TREE_CHAIN of the return value should
3342 be passed back in if further occurrences are wanted. */
3345 lookup_attribute (const char *attr_name
, tree list
)
3348 size_t attr_len
= strlen (attr_name
);
3350 for (l
= list
; l
; l
= TREE_CHAIN (l
))
3352 gcc_assert (TREE_CODE (TREE_PURPOSE (l
)) == IDENTIFIER_NODE
);
3353 if (is_attribute_with_length_p (attr_name
, attr_len
, TREE_PURPOSE (l
)))
3360 /* Return an attribute list that is the union of a1 and a2. */
3363 merge_attributes (tree a1
, tree a2
)
3367 /* Either one unset? Take the set one. */
3369 if ((attributes
= a1
) == 0)
3372 /* One that completely contains the other? Take it. */
3374 else if (a2
!= 0 && ! attribute_list_contained (a1
, a2
))
3376 if (attribute_list_contained (a2
, a1
))
3380 /* Pick the longest list, and hang on the other list. */
3382 if (list_length (a1
) < list_length (a2
))
3383 attributes
= a2
, a2
= a1
;
3385 for (; a2
!= 0; a2
= TREE_CHAIN (a2
))
3388 for (a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
3391 a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
3394 if (simple_cst_equal (TREE_VALUE (a
), TREE_VALUE (a2
)) == 1)
3399 a1
= copy_node (a2
);
3400 TREE_CHAIN (a1
) = attributes
;
3409 /* Given types T1 and T2, merge their attributes and return
3413 merge_type_attributes (tree t1
, tree t2
)
3415 return merge_attributes (TYPE_ATTRIBUTES (t1
),
3416 TYPE_ATTRIBUTES (t2
));
3419 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
3423 merge_decl_attributes (tree olddecl
, tree newdecl
)
3425 return merge_attributes (DECL_ATTRIBUTES (olddecl
),
3426 DECL_ATTRIBUTES (newdecl
));
3429 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
3431 /* Specialization of merge_decl_attributes for various Windows targets.
3433 This handles the following situation:
3435 __declspec (dllimport) int foo;
3438 The second instance of `foo' nullifies the dllimport. */
3441 merge_dllimport_decl_attributes (tree old
, tree
new)
3444 int delete_dllimport_p
= 1;
3446 /* What we need to do here is remove from `old' dllimport if it doesn't
3447 appear in `new'. dllimport behaves like extern: if a declaration is
3448 marked dllimport and a definition appears later, then the object
3449 is not dllimport'd. We also remove a `new' dllimport if the old list
3450 contains dllexport: dllexport always overrides dllimport, regardless
3451 of the order of declaration. */
3452 if (!VAR_OR_FUNCTION_DECL_P (new))
3453 delete_dllimport_p
= 0;
3454 else if (DECL_DLLIMPORT_P (new)
3455 && lookup_attribute ("dllexport", DECL_ATTRIBUTES (old
)))
3457 DECL_DLLIMPORT_P (new) = 0;
3458 warning (OPT_Wattributes
, "%q+D already declared with dllexport attribute: "
3459 "dllimport ignored", new);
3461 else if (DECL_DLLIMPORT_P (old
) && !DECL_DLLIMPORT_P (new))
3463 /* Warn about overriding a symbol that has already been used. eg:
3464 extern int __attribute__ ((dllimport)) foo;
3465 int* bar () {return &foo;}
3468 if (TREE_USED (old
))
3470 warning (0, "%q+D redeclared without dllimport attribute "
3471 "after being referenced with dll linkage", new);
3472 /* If we have used a variable's address with dllimport linkage,
3473 keep the old DECL_DLLIMPORT_P flag: the ADDR_EXPR using the
3474 decl may already have had TREE_INVARIANT and TREE_CONSTANT
3476 We still remove the attribute so that assembler code refers
3477 to '&foo rather than '_imp__foo'. */
3478 if (TREE_CODE (old
) == VAR_DECL
&& TREE_ADDRESSABLE (old
))
3479 DECL_DLLIMPORT_P (new) = 1;
3482 /* Let an inline definition silently override the external reference,
3483 but otherwise warn about attribute inconsistency. */
3484 else if (TREE_CODE (new) == VAR_DECL
3485 || !DECL_DECLARED_INLINE_P (new))
3486 warning (OPT_Wattributes
, "%q+D redeclared without dllimport attribute: "
3487 "previous dllimport ignored", new);
3490 delete_dllimport_p
= 0;
3492 a
= merge_attributes (DECL_ATTRIBUTES (old
), DECL_ATTRIBUTES (new));
3494 if (delete_dllimport_p
)
3497 const size_t attr_len
= strlen ("dllimport");
3499 /* Scan the list for dllimport and delete it. */
3500 for (prev
= NULL_TREE
, t
= a
; t
; prev
= t
, t
= TREE_CHAIN (t
))
3502 if (is_attribute_with_length_p ("dllimport", attr_len
,
3505 if (prev
== NULL_TREE
)
3508 TREE_CHAIN (prev
) = TREE_CHAIN (t
);
3517 /* Handle a "dllimport" or "dllexport" attribute; arguments as in
3518 struct attribute_spec.handler. */
3521 handle_dll_attribute (tree
* pnode
, tree name
, tree args
, int flags
,
3526 /* These attributes may apply to structure and union types being created,
3527 but otherwise should pass to the declaration involved. */
3530 if (flags
& ((int) ATTR_FLAG_DECL_NEXT
| (int) ATTR_FLAG_FUNCTION_NEXT
3531 | (int) ATTR_FLAG_ARRAY_NEXT
))
3533 *no_add_attrs
= true;
3534 return tree_cons (name
, args
, NULL_TREE
);
3536 if (TREE_CODE (node
) != RECORD_TYPE
&& TREE_CODE (node
) != UNION_TYPE
)
3538 warning (OPT_Wattributes
, "%qs attribute ignored",
3539 IDENTIFIER_POINTER (name
));
3540 *no_add_attrs
= true;
3546 /* Report error on dllimport ambiguities seen now before they cause
3548 if (is_attribute_p ("dllimport", name
))
3550 /* Honor any target-specific overrides. */
3551 if (!targetm
.valid_dllimport_attribute_p (node
))
3552 *no_add_attrs
= true;
3554 else if (TREE_CODE (node
) == FUNCTION_DECL
3555 && DECL_DECLARED_INLINE_P (node
))
3557 warning (OPT_Wattributes
, "inline function %q+D declared as "
3558 " dllimport: attribute ignored", node
);
3559 *no_add_attrs
= true;
3561 /* Like MS, treat definition of dllimported variables and
3562 non-inlined functions on declaration as syntax errors. */
3563 else if (TREE_CODE (node
) == FUNCTION_DECL
&& DECL_INITIAL (node
))
3565 error ("function %q+D definition is marked dllimport", node
);
3566 *no_add_attrs
= true;
3569 else if (TREE_CODE (node
) == VAR_DECL
)
3571 if (DECL_INITIAL (node
))
3573 error ("variable %q+D definition is marked dllimport",
3575 *no_add_attrs
= true;
3578 /* `extern' needn't be specified with dllimport.
3579 Specify `extern' now and hope for the best. Sigh. */
3580 DECL_EXTERNAL (node
) = 1;
3581 /* Also, implicitly give dllimport'd variables declared within
3582 a function global scope, unless declared static. */
3583 if (current_function_decl
!= NULL_TREE
&& !TREE_STATIC (node
))
3584 TREE_PUBLIC (node
) = 1;
3587 if (*no_add_attrs
== false)
3588 DECL_DLLIMPORT_P (node
) = 1;
3591 /* Report error if symbol is not accessible at global scope. */
3592 if (!TREE_PUBLIC (node
)
3593 && (TREE_CODE (node
) == VAR_DECL
3594 || TREE_CODE (node
) == FUNCTION_DECL
))
3596 error ("external linkage required for symbol %q+D because of "
3597 "%qs attribute", node
, IDENTIFIER_POINTER (name
));
3598 *no_add_attrs
= true;
3604 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
3606 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
3607 of the various TYPE_QUAL values. */
3610 set_type_quals (tree type
, int type_quals
)
3612 TYPE_READONLY (type
) = (type_quals
& TYPE_QUAL_CONST
) != 0;
3613 TYPE_VOLATILE (type
) = (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
3614 TYPE_RESTRICT (type
) = (type_quals
& TYPE_QUAL_RESTRICT
) != 0;
3617 /* Returns true iff cand is equivalent to base with type_quals. */
3620 check_qualified_type (tree cand
, tree base
, int type_quals
)
3622 return (TYPE_QUALS (cand
) == type_quals
3623 && TYPE_NAME (cand
) == TYPE_NAME (base
)
3624 /* Apparently this is needed for Objective-C. */
3625 && TYPE_CONTEXT (cand
) == TYPE_CONTEXT (base
)
3626 && attribute_list_equal (TYPE_ATTRIBUTES (cand
),
3627 TYPE_ATTRIBUTES (base
)));
3630 /* Return a version of the TYPE, qualified as indicated by the
3631 TYPE_QUALS, if one exists. If no qualified version exists yet,
3632 return NULL_TREE. */
3635 get_qualified_type (tree type
, int type_quals
)
3639 if (TYPE_QUALS (type
) == type_quals
)
3642 /* Search the chain of variants to see if there is already one there just
3643 like the one we need to have. If so, use that existing one. We must
3644 preserve the TYPE_NAME, since there is code that depends on this. */
3645 for (t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
3646 if (check_qualified_type (t
, type
, type_quals
))
3652 /* Like get_qualified_type, but creates the type if it does not
3653 exist. This function never returns NULL_TREE. */
3656 build_qualified_type (tree type
, int type_quals
)
3660 /* See if we already have the appropriate qualified variant. */
3661 t
= get_qualified_type (type
, type_quals
);
3663 /* If not, build it. */
3666 t
= build_variant_type_copy (type
);
3667 set_type_quals (t
, type_quals
);
3669 /* If it's a pointer type, the new variant points to the same type. */
3670 if (TREE_CODE (type
) == POINTER_TYPE
)
3672 TYPE_NEXT_PTR_TO (t
) = TYPE_NEXT_PTR_TO (type
);
3673 TYPE_NEXT_PTR_TO (type
) = t
;
3676 /* Same for a reference type. */
3677 else if (TREE_CODE (type
) == REFERENCE_TYPE
)
3679 TYPE_NEXT_REF_TO (t
) = TYPE_NEXT_REF_TO (type
);
3680 TYPE_NEXT_REF_TO (type
) = t
;
3687 /* Create a new distinct copy of TYPE. The new type is made its own
3691 build_distinct_type_copy (tree type
)
3693 tree t
= copy_node (type
);
3695 TYPE_POINTER_TO (t
) = 0;
3696 TYPE_REFERENCE_TO (t
) = 0;
3698 /* Make it its own variant. */
3699 TYPE_MAIN_VARIANT (t
) = t
;
3700 TYPE_NEXT_VARIANT (t
) = 0;
3705 /* Create a new variant of TYPE, equivalent but distinct.
3706 This is so the caller can modify it. */
3709 build_variant_type_copy (tree type
)
3711 tree t
, m
= TYPE_MAIN_VARIANT (type
);
3713 t
= build_distinct_type_copy (type
);
3715 /* Add the new type to the chain of variants of TYPE. */
3716 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (m
);
3717 TYPE_NEXT_VARIANT (m
) = t
;
3718 TYPE_MAIN_VARIANT (t
) = m
;
3723 /* Return true if the from tree in both tree maps are equal. */
3726 tree_map_eq (const void *va
, const void *vb
)
3728 const struct tree_map
*a
= va
, *b
= vb
;
3729 return (a
->from
== b
->from
);
3732 /* Hash a from tree in a tree_map. */
3735 tree_map_hash (const void *item
)
3737 return (((const struct tree_map
*) item
)->hash
);
3740 /* Return true if this tree map structure is marked for garbage collection
3741 purposes. We simply return true if the from tree is marked, so that this
3742 structure goes away when the from tree goes away. */
3745 tree_map_marked_p (const void *p
)
3747 tree from
= ((struct tree_map
*) p
)->from
;
3749 return ggc_marked_p (from
);
3752 /* Return true if the trees in the tree_int_map *'s VA and VB are equal. */
3755 tree_int_map_eq (const void *va
, const void *vb
)
3757 const struct tree_int_map
*a
= va
, *b
= vb
;
3758 return (a
->from
== b
->from
);
3761 /* Hash a from tree in the tree_int_map * ITEM. */
3764 tree_int_map_hash (const void *item
)
3766 return htab_hash_pointer (((const struct tree_int_map
*)item
)->from
);
3769 /* Return true if this tree int map structure is marked for garbage collection
3770 purposes. We simply return true if the from tree_int_map *P's from tree is marked, so that this
3771 structure goes away when the from tree goes away. */
3774 tree_int_map_marked_p (const void *p
)
3776 tree from
= ((struct tree_int_map
*) p
)->from
;
3778 return ggc_marked_p (from
);
3780 /* Lookup an init priority for FROM, and return it if we find one. */
3783 decl_init_priority_lookup (tree from
)
3785 struct tree_int_map
*h
, in
;
3788 h
= htab_find_with_hash (init_priority_for_decl
,
3789 &in
, htab_hash_pointer (from
));
3795 /* Insert a mapping FROM->TO in the init priority hashtable. */
3798 decl_init_priority_insert (tree from
, unsigned short to
)
3800 struct tree_int_map
*h
;
3803 h
= ggc_alloc (sizeof (struct tree_int_map
));
3806 loc
= htab_find_slot_with_hash (init_priority_for_decl
, h
,
3807 htab_hash_pointer (from
), INSERT
);
3808 *(struct tree_int_map
**) loc
= h
;
3811 /* Look up a restrict qualified base decl for FROM. */
3814 decl_restrict_base_lookup (tree from
)
3820 h
= htab_find_with_hash (restrict_base_for_decl
, &in
,
3821 htab_hash_pointer (from
));
3822 return h
? h
->to
: NULL_TREE
;
3825 /* Record the restrict qualified base TO for FROM. */
3828 decl_restrict_base_insert (tree from
, tree to
)
3833 h
= ggc_alloc (sizeof (struct tree_map
));
3834 h
->hash
= htab_hash_pointer (from
);
3837 loc
= htab_find_slot_with_hash (restrict_base_for_decl
, h
, h
->hash
, INSERT
);
3838 *(struct tree_map
**) loc
= h
;
3841 /* Print out the statistics for the DECL_DEBUG_EXPR hash table. */
3844 print_debug_expr_statistics (void)
3846 fprintf (stderr
, "DECL_DEBUG_EXPR hash: size %ld, %ld elements, %f collisions\n",
3847 (long) htab_size (debug_expr_for_decl
),
3848 (long) htab_elements (debug_expr_for_decl
),
3849 htab_collisions (debug_expr_for_decl
));
3852 /* Print out the statistics for the DECL_VALUE_EXPR hash table. */
3855 print_value_expr_statistics (void)
3857 fprintf (stderr
, "DECL_VALUE_EXPR hash: size %ld, %ld elements, %f collisions\n",
3858 (long) htab_size (value_expr_for_decl
),
3859 (long) htab_elements (value_expr_for_decl
),
3860 htab_collisions (value_expr_for_decl
));
3863 /* Print out statistics for the RESTRICT_BASE_FOR_DECL hash table, but
3864 don't print anything if the table is empty. */
3867 print_restrict_base_statistics (void)
3869 if (htab_elements (restrict_base_for_decl
) != 0)
3871 "RESTRICT_BASE hash: size %ld, %ld elements, %f collisions\n",
3872 (long) htab_size (restrict_base_for_decl
),
3873 (long) htab_elements (restrict_base_for_decl
),
3874 htab_collisions (restrict_base_for_decl
));
3877 /* Lookup a debug expression for FROM, and return it if we find one. */
3880 decl_debug_expr_lookup (tree from
)
3882 struct tree_map
*h
, in
;
3885 h
= htab_find_with_hash (debug_expr_for_decl
, &in
, htab_hash_pointer (from
));
3891 /* Insert a mapping FROM->TO in the debug expression hashtable. */
3894 decl_debug_expr_insert (tree from
, tree to
)
3899 h
= ggc_alloc (sizeof (struct tree_map
));
3900 h
->hash
= htab_hash_pointer (from
);
3903 loc
= htab_find_slot_with_hash (debug_expr_for_decl
, h
, h
->hash
, INSERT
);
3904 *(struct tree_map
**) loc
= h
;
3907 /* Lookup a value expression for FROM, and return it if we find one. */
3910 decl_value_expr_lookup (tree from
)
3912 struct tree_map
*h
, in
;
3915 h
= htab_find_with_hash (value_expr_for_decl
, &in
, htab_hash_pointer (from
));
3921 /* Insert a mapping FROM->TO in the value expression hashtable. */
3924 decl_value_expr_insert (tree from
, tree to
)
3929 h
= ggc_alloc (sizeof (struct tree_map
));
3930 h
->hash
= htab_hash_pointer (from
);
3933 loc
= htab_find_slot_with_hash (value_expr_for_decl
, h
, h
->hash
, INSERT
);
3934 *(struct tree_map
**) loc
= h
;
3937 /* Hashing of types so that we don't make duplicates.
3938 The entry point is `type_hash_canon'. */
3940 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
3941 with types in the TREE_VALUE slots), by adding the hash codes
3942 of the individual types. */
3945 type_hash_list (tree list
, hashval_t hashcode
)
3949 for (tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3950 if (TREE_VALUE (tail
) != error_mark_node
)
3951 hashcode
= iterative_hash_object (TYPE_HASH (TREE_VALUE (tail
)),
3957 /* These are the Hashtable callback functions. */
3959 /* Returns true iff the types are equivalent. */
3962 type_hash_eq (const void *va
, const void *vb
)
3964 const struct type_hash
*a
= va
, *b
= vb
;
3966 /* First test the things that are the same for all types. */
3967 if (a
->hash
!= b
->hash
3968 || TREE_CODE (a
->type
) != TREE_CODE (b
->type
)
3969 || TREE_TYPE (a
->type
) != TREE_TYPE (b
->type
)
3970 || !attribute_list_equal (TYPE_ATTRIBUTES (a
->type
),
3971 TYPE_ATTRIBUTES (b
->type
))
3972 || TYPE_ALIGN (a
->type
) != TYPE_ALIGN (b
->type
)
3973 || TYPE_MODE (a
->type
) != TYPE_MODE (b
->type
))
3976 switch (TREE_CODE (a
->type
))
3981 case REFERENCE_TYPE
:
3985 return TYPE_VECTOR_SUBPARTS (a
->type
) == TYPE_VECTOR_SUBPARTS (b
->type
);
3988 if (TYPE_VALUES (a
->type
) != TYPE_VALUES (b
->type
)
3989 && !(TYPE_VALUES (a
->type
)
3990 && TREE_CODE (TYPE_VALUES (a
->type
)) == TREE_LIST
3991 && TYPE_VALUES (b
->type
)
3992 && TREE_CODE (TYPE_VALUES (b
->type
)) == TREE_LIST
3993 && type_list_equal (TYPE_VALUES (a
->type
),
3994 TYPE_VALUES (b
->type
))))
3997 /* ... fall through ... */
4003 return ((TYPE_MAX_VALUE (a
->type
) == TYPE_MAX_VALUE (b
->type
)
4004 || tree_int_cst_equal (TYPE_MAX_VALUE (a
->type
),
4005 TYPE_MAX_VALUE (b
->type
)))
4006 && (TYPE_MIN_VALUE (a
->type
) == TYPE_MIN_VALUE (b
->type
)
4007 || tree_int_cst_equal (TYPE_MIN_VALUE (a
->type
),
4008 TYPE_MIN_VALUE (b
->type
))));
4011 return TYPE_OFFSET_BASETYPE (a
->type
) == TYPE_OFFSET_BASETYPE (b
->type
);
4014 return (TYPE_METHOD_BASETYPE (a
->type
) == TYPE_METHOD_BASETYPE (b
->type
)
4015 && (TYPE_ARG_TYPES (a
->type
) == TYPE_ARG_TYPES (b
->type
)
4016 || (TYPE_ARG_TYPES (a
->type
)
4017 && TREE_CODE (TYPE_ARG_TYPES (a
->type
)) == TREE_LIST
4018 && TYPE_ARG_TYPES (b
->type
)
4019 && TREE_CODE (TYPE_ARG_TYPES (b
->type
)) == TREE_LIST
4020 && type_list_equal (TYPE_ARG_TYPES (a
->type
),
4021 TYPE_ARG_TYPES (b
->type
)))));
4024 return TYPE_DOMAIN (a
->type
) == TYPE_DOMAIN (b
->type
);
4028 case QUAL_UNION_TYPE
:
4029 return (TYPE_FIELDS (a
->type
) == TYPE_FIELDS (b
->type
)
4030 || (TYPE_FIELDS (a
->type
)
4031 && TREE_CODE (TYPE_FIELDS (a
->type
)) == TREE_LIST
4032 && TYPE_FIELDS (b
->type
)
4033 && TREE_CODE (TYPE_FIELDS (b
->type
)) == TREE_LIST
4034 && type_list_equal (TYPE_FIELDS (a
->type
),
4035 TYPE_FIELDS (b
->type
))));
4038 return (TYPE_ARG_TYPES (a
->type
) == TYPE_ARG_TYPES (b
->type
)
4039 || (TYPE_ARG_TYPES (a
->type
)
4040 && TREE_CODE (TYPE_ARG_TYPES (a
->type
)) == TREE_LIST
4041 && TYPE_ARG_TYPES (b
->type
)
4042 && TREE_CODE (TYPE_ARG_TYPES (b
->type
)) == TREE_LIST
4043 && type_list_equal (TYPE_ARG_TYPES (a
->type
),
4044 TYPE_ARG_TYPES (b
->type
))));
4051 /* Return the cached hash value. */
4054 type_hash_hash (const void *item
)
4056 return ((const struct type_hash
*) item
)->hash
;
4059 /* Look in the type hash table for a type isomorphic to TYPE.
4060 If one is found, return it. Otherwise return 0. */
4063 type_hash_lookup (hashval_t hashcode
, tree type
)
4065 struct type_hash
*h
, in
;
4067 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
4068 must call that routine before comparing TYPE_ALIGNs. */
4074 h
= htab_find_with_hash (type_hash_table
, &in
, hashcode
);
4080 /* Add an entry to the type-hash-table
4081 for a type TYPE whose hash code is HASHCODE. */
4084 type_hash_add (hashval_t hashcode
, tree type
)
4086 struct type_hash
*h
;
4089 h
= ggc_alloc (sizeof (struct type_hash
));
4092 loc
= htab_find_slot_with_hash (type_hash_table
, h
, hashcode
, INSERT
);
4093 *(struct type_hash
**) loc
= h
;
4096 /* Given TYPE, and HASHCODE its hash code, return the canonical
4097 object for an identical type if one already exists.
4098 Otherwise, return TYPE, and record it as the canonical object.
4100 To use this function, first create a type of the sort you want.
4101 Then compute its hash code from the fields of the type that
4102 make it different from other similar types.
4103 Then call this function and use the value. */
4106 type_hash_canon (unsigned int hashcode
, tree type
)
4110 /* The hash table only contains main variants, so ensure that's what we're
4112 gcc_assert (TYPE_MAIN_VARIANT (type
) == type
);
4114 if (!lang_hooks
.types
.hash_types
)
4117 /* See if the type is in the hash table already. If so, return it.
4118 Otherwise, add the type. */
4119 t1
= type_hash_lookup (hashcode
, type
);
4122 #ifdef GATHER_STATISTICS
4123 tree_node_counts
[(int) t_kind
]--;
4124 tree_node_sizes
[(int) t_kind
] -= sizeof (struct tree_type
);
4130 type_hash_add (hashcode
, type
);
4135 /* See if the data pointed to by the type hash table is marked. We consider
4136 it marked if the type is marked or if a debug type number or symbol
4137 table entry has been made for the type. This reduces the amount of
4138 debugging output and eliminates that dependency of the debug output on
4139 the number of garbage collections. */
4142 type_hash_marked_p (const void *p
)
4144 tree type
= ((struct type_hash
*) p
)->type
;
4146 return ggc_marked_p (type
) || TYPE_SYMTAB_POINTER (type
);
4150 print_type_hash_statistics (void)
4152 fprintf (stderr
, "Type hash: size %ld, %ld elements, %f collisions\n",
4153 (long) htab_size (type_hash_table
),
4154 (long) htab_elements (type_hash_table
),
4155 htab_collisions (type_hash_table
));
4158 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
4159 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
4160 by adding the hash codes of the individual attributes. */
4163 attribute_hash_list (tree list
, hashval_t hashcode
)
4167 for (tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
4168 /* ??? Do we want to add in TREE_VALUE too? */
4169 hashcode
= iterative_hash_object
4170 (IDENTIFIER_HASH_VALUE (TREE_PURPOSE (tail
)), hashcode
);
4174 /* Given two lists of attributes, return true if list l2 is
4175 equivalent to l1. */
4178 attribute_list_equal (tree l1
, tree l2
)
4180 return attribute_list_contained (l1
, l2
)
4181 && attribute_list_contained (l2
, l1
);
4184 /* Given two lists of attributes, return true if list L2 is
4185 completely contained within L1. */
4186 /* ??? This would be faster if attribute names were stored in a canonicalized
4187 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
4188 must be used to show these elements are equivalent (which they are). */
4189 /* ??? It's not clear that attributes with arguments will always be handled
4193 attribute_list_contained (tree l1
, tree l2
)
4197 /* First check the obvious, maybe the lists are identical. */
4201 /* Maybe the lists are similar. */
4202 for (t1
= l1
, t2
= l2
;
4204 && TREE_PURPOSE (t1
) == TREE_PURPOSE (t2
)
4205 && TREE_VALUE (t1
) == TREE_VALUE (t2
);
4206 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
));
4208 /* Maybe the lists are equal. */
4209 if (t1
== 0 && t2
== 0)
4212 for (; t2
!= 0; t2
= TREE_CHAIN (t2
))
4215 for (attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)), l1
);
4217 attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)),
4220 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) == 1)
4227 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) != 1)
4234 /* Given two lists of types
4235 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
4236 return 1 if the lists contain the same types in the same order.
4237 Also, the TREE_PURPOSEs must match. */
4240 type_list_equal (tree l1
, tree l2
)
4244 for (t1
= l1
, t2
= l2
; t1
&& t2
; t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
4245 if (TREE_VALUE (t1
) != TREE_VALUE (t2
)
4246 || (TREE_PURPOSE (t1
) != TREE_PURPOSE (t2
)
4247 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1
), TREE_PURPOSE (t2
))
4248 && (TREE_TYPE (TREE_PURPOSE (t1
))
4249 == TREE_TYPE (TREE_PURPOSE (t2
))))))
4255 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
4256 given by TYPE. If the argument list accepts variable arguments,
4257 then this function counts only the ordinary arguments. */
4260 type_num_arguments (tree type
)
4265 for (t
= TYPE_ARG_TYPES (type
); t
; t
= TREE_CHAIN (t
))
4266 /* If the function does not take a variable number of arguments,
4267 the last element in the list will have type `void'. */
4268 if (VOID_TYPE_P (TREE_VALUE (t
)))
4276 /* Nonzero if integer constants T1 and T2
4277 represent the same constant value. */
4280 tree_int_cst_equal (tree t1
, tree t2
)
4285 if (t1
== 0 || t2
== 0)
4288 if (TREE_CODE (t1
) == INTEGER_CST
4289 && TREE_CODE (t2
) == INTEGER_CST
4290 && TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
4291 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
))
4297 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
4298 The precise way of comparison depends on their data type. */
4301 tree_int_cst_lt (tree t1
, tree t2
)
4306 if (TYPE_UNSIGNED (TREE_TYPE (t1
)) != TYPE_UNSIGNED (TREE_TYPE (t2
)))
4308 int t1_sgn
= tree_int_cst_sgn (t1
);
4309 int t2_sgn
= tree_int_cst_sgn (t2
);
4311 if (t1_sgn
< t2_sgn
)
4313 else if (t1_sgn
> t2_sgn
)
4315 /* Otherwise, both are non-negative, so we compare them as
4316 unsigned just in case one of them would overflow a signed
4319 else if (!TYPE_UNSIGNED (TREE_TYPE (t1
)))
4320 return INT_CST_LT (t1
, t2
);
4322 return INT_CST_LT_UNSIGNED (t1
, t2
);
4325 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
4328 tree_int_cst_compare (tree t1
, tree t2
)
4330 if (tree_int_cst_lt (t1
, t2
))
4332 else if (tree_int_cst_lt (t2
, t1
))
4338 /* Return 1 if T is an INTEGER_CST that can be manipulated efficiently on
4339 the host. If POS is zero, the value can be represented in a single
4340 HOST_WIDE_INT. If POS is nonzero, the value must be non-negative and can
4341 be represented in a single unsigned HOST_WIDE_INT. */
4344 host_integerp (tree t
, int pos
)
4346 return (TREE_CODE (t
) == INTEGER_CST
4347 && ! TREE_OVERFLOW (t
)
4348 && ((TREE_INT_CST_HIGH (t
) == 0
4349 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) >= 0)
4350 || (! pos
&& TREE_INT_CST_HIGH (t
) == -1
4351 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0
4352 && !TYPE_UNSIGNED (TREE_TYPE (t
)))
4353 || (pos
&& TREE_INT_CST_HIGH (t
) == 0)));
4356 /* Return the HOST_WIDE_INT least significant bits of T if it is an
4357 INTEGER_CST and there is no overflow. POS is nonzero if the result must
4358 be non-negative. We must be able to satisfy the above conditions. */
4361 tree_low_cst (tree t
, int pos
)
4363 gcc_assert (host_integerp (t
, pos
));
4364 return TREE_INT_CST_LOW (t
);
4367 /* Return the most significant bit of the integer constant T. */
4370 tree_int_cst_msb (tree t
)
4374 unsigned HOST_WIDE_INT l
;
4376 /* Note that using TYPE_PRECISION here is wrong. We care about the
4377 actual bits, not the (arbitrary) range of the type. */
4378 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t
))) - 1;
4379 rshift_double (TREE_INT_CST_LOW (t
), TREE_INT_CST_HIGH (t
), prec
,
4380 2 * HOST_BITS_PER_WIDE_INT
, &l
, &h
, 0);
4381 return (l
& 1) == 1;
4384 /* Return an indication of the sign of the integer constant T.
4385 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
4386 Note that -1 will never be returned if T's type is unsigned. */
4389 tree_int_cst_sgn (tree t
)
4391 if (TREE_INT_CST_LOW (t
) == 0 && TREE_INT_CST_HIGH (t
) == 0)
4393 else if (TYPE_UNSIGNED (TREE_TYPE (t
)))
4395 else if (TREE_INT_CST_HIGH (t
) < 0)
4401 /* Compare two constructor-element-type constants. Return 1 if the lists
4402 are known to be equal; otherwise return 0. */
4405 simple_cst_list_equal (tree l1
, tree l2
)
4407 while (l1
!= NULL_TREE
&& l2
!= NULL_TREE
)
4409 if (simple_cst_equal (TREE_VALUE (l1
), TREE_VALUE (l2
)) != 1)
4412 l1
= TREE_CHAIN (l1
);
4413 l2
= TREE_CHAIN (l2
);
4419 /* Return truthvalue of whether T1 is the same tree structure as T2.
4420 Return 1 if they are the same.
4421 Return 0 if they are understandably different.
4422 Return -1 if either contains tree structure not understood by
4426 simple_cst_equal (tree t1
, tree t2
)
4428 enum tree_code code1
, code2
;
4434 if (t1
== 0 || t2
== 0)
4437 code1
= TREE_CODE (t1
);
4438 code2
= TREE_CODE (t2
);
4440 if (code1
== NOP_EXPR
|| code1
== CONVERT_EXPR
|| code1
== NON_LVALUE_EXPR
)
4442 if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
4443 || code2
== NON_LVALUE_EXPR
)
4444 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
4446 return simple_cst_equal (TREE_OPERAND (t1
, 0), t2
);
4449 else if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
4450 || code2
== NON_LVALUE_EXPR
)
4451 return simple_cst_equal (t1
, TREE_OPERAND (t2
, 0));
4459 return (TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
4460 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
));
4463 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
4466 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
4467 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
4468 TREE_STRING_LENGTH (t1
)));
4472 unsigned HOST_WIDE_INT idx
;
4473 VEC(constructor_elt
, gc
) *v1
= CONSTRUCTOR_ELTS (t1
);
4474 VEC(constructor_elt
, gc
) *v2
= CONSTRUCTOR_ELTS (t2
);
4476 if (VEC_length (constructor_elt
, v1
) != VEC_length (constructor_elt
, v2
))
4479 for (idx
= 0; idx
< VEC_length (constructor_elt
, v1
); ++idx
)
4480 /* ??? Should we handle also fields here? */
4481 if (!simple_cst_equal (VEC_index (constructor_elt
, v1
, idx
)->value
,
4482 VEC_index (constructor_elt
, v2
, idx
)->value
))
4488 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
4491 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
4495 simple_cst_list_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
4498 /* Special case: if either target is an unallocated VAR_DECL,
4499 it means that it's going to be unified with whatever the
4500 TARGET_EXPR is really supposed to initialize, so treat it
4501 as being equivalent to anything. */
4502 if ((TREE_CODE (TREE_OPERAND (t1
, 0)) == VAR_DECL
4503 && DECL_NAME (TREE_OPERAND (t1
, 0)) == NULL_TREE
4504 && !DECL_RTL_SET_P (TREE_OPERAND (t1
, 0)))
4505 || (TREE_CODE (TREE_OPERAND (t2
, 0)) == VAR_DECL
4506 && DECL_NAME (TREE_OPERAND (t2
, 0)) == NULL_TREE
4507 && !DECL_RTL_SET_P (TREE_OPERAND (t2
, 0))))
4510 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
4515 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
4517 case WITH_CLEANUP_EXPR
:
4518 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
4522 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t1
, 1));
4525 if (TREE_OPERAND (t1
, 1) == TREE_OPERAND (t2
, 1))
4526 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
4540 /* This general rule works for most tree codes. All exceptions should be
4541 handled above. If this is a language-specific tree code, we can't
4542 trust what might be in the operand, so say we don't know
4544 if ((int) code1
>= (int) LAST_AND_UNUSED_TREE_CODE
)
4547 switch (TREE_CODE_CLASS (code1
))
4551 case tcc_comparison
:
4552 case tcc_expression
:
4556 for (i
= 0; i
< TREE_CODE_LENGTH (code1
); i
++)
4558 cmp
= simple_cst_equal (TREE_OPERAND (t1
, i
), TREE_OPERAND (t2
, i
));
4570 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
4571 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
4572 than U, respectively. */
4575 compare_tree_int (tree t
, unsigned HOST_WIDE_INT u
)
4577 if (tree_int_cst_sgn (t
) < 0)
4579 else if (TREE_INT_CST_HIGH (t
) != 0)
4581 else if (TREE_INT_CST_LOW (t
) == u
)
4583 else if (TREE_INT_CST_LOW (t
) < u
)
4589 /* Return true if CODE represents an associative tree code. Otherwise
4592 associative_tree_code (enum tree_code code
)
4611 /* Return true if CODE represents a commutative tree code. Otherwise
4614 commutative_tree_code (enum tree_code code
)
4627 case UNORDERED_EXPR
:
4631 case TRUTH_AND_EXPR
:
4632 case TRUTH_XOR_EXPR
:
4642 /* Generate a hash value for an expression. This can be used iteratively
4643 by passing a previous result as the "val" argument.
4645 This function is intended to produce the same hash for expressions which
4646 would compare equal using operand_equal_p. */
4649 iterative_hash_expr (tree t
, hashval_t val
)
4652 enum tree_code code
;
4656 return iterative_hash_pointer (t
, val
);
4658 code
= TREE_CODE (t
);
4662 /* Alas, constants aren't shared, so we can't rely on pointer
4665 val
= iterative_hash_host_wide_int (TREE_INT_CST_LOW (t
), val
);
4666 return iterative_hash_host_wide_int (TREE_INT_CST_HIGH (t
), val
);
4669 unsigned int val2
= real_hash (TREE_REAL_CST_PTR (t
));
4671 return iterative_hash_hashval_t (val2
, val
);
4674 return iterative_hash (TREE_STRING_POINTER (t
),
4675 TREE_STRING_LENGTH (t
), val
);
4677 val
= iterative_hash_expr (TREE_REALPART (t
), val
);
4678 return iterative_hash_expr (TREE_IMAGPART (t
), val
);
4680 return iterative_hash_expr (TREE_VECTOR_CST_ELTS (t
), val
);
4684 /* we can just compare by pointer. */
4685 return iterative_hash_pointer (t
, val
);
4688 /* A list of expressions, for a CALL_EXPR or as the elements of a
4690 for (; t
; t
= TREE_CHAIN (t
))
4691 val
= iterative_hash_expr (TREE_VALUE (t
), val
);
4695 unsigned HOST_WIDE_INT idx
;
4697 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (t
), idx
, field
, value
)
4699 val
= iterative_hash_expr (field
, val
);
4700 val
= iterative_hash_expr (value
, val
);
4705 /* When referring to a built-in FUNCTION_DECL, use the
4706 __builtin__ form. Otherwise nodes that compare equal
4707 according to operand_equal_p might get different
4709 if (DECL_BUILT_IN (t
))
4711 val
= iterative_hash_pointer (built_in_decls
[DECL_FUNCTION_CODE (t
)],
4715 /* else FALL THROUGH */
4717 class = TREE_CODE_CLASS (code
);
4719 if (class == tcc_declaration
)
4721 /* Otherwise, we can just compare decls by pointer. */
4722 val
= iterative_hash_pointer (t
, val
);
4726 gcc_assert (IS_EXPR_CODE_CLASS (class));
4728 val
= iterative_hash_object (code
, val
);
4730 /* Don't hash the type, that can lead to having nodes which
4731 compare equal according to operand_equal_p, but which
4732 have different hash codes. */
4733 if (code
== NOP_EXPR
4734 || code
== CONVERT_EXPR
4735 || code
== NON_LVALUE_EXPR
)
4737 /* Make sure to include signness in the hash computation. */
4738 val
+= TYPE_UNSIGNED (TREE_TYPE (t
));
4739 val
= iterative_hash_expr (TREE_OPERAND (t
, 0), val
);
4742 else if (commutative_tree_code (code
))
4744 /* It's a commutative expression. We want to hash it the same
4745 however it appears. We do this by first hashing both operands
4746 and then rehashing based on the order of their independent
4748 hashval_t one
= iterative_hash_expr (TREE_OPERAND (t
, 0), 0);
4749 hashval_t two
= iterative_hash_expr (TREE_OPERAND (t
, 1), 0);
4753 t
= one
, one
= two
, two
= t
;
4755 val
= iterative_hash_hashval_t (one
, val
);
4756 val
= iterative_hash_hashval_t (two
, val
);
4759 for (i
= TREE_CODE_LENGTH (code
) - 1; i
>= 0; --i
)
4760 val
= iterative_hash_expr (TREE_OPERAND (t
, i
), val
);
4767 /* Constructors for pointer, array and function types.
4768 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
4769 constructed by language-dependent code, not here.) */
4771 /* Construct, lay out and return the type of pointers to TO_TYPE with
4772 mode MODE. If CAN_ALIAS_ALL is TRUE, indicate this type can
4773 reference all of memory. If such a type has already been
4774 constructed, reuse it. */
4777 build_pointer_type_for_mode (tree to_type
, enum machine_mode mode
,
4782 if (to_type
== error_mark_node
)
4783 return error_mark_node
;
4785 /* In some cases, languages will have things that aren't a POINTER_TYPE
4786 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_POINTER_TO.
4787 In that case, return that type without regard to the rest of our
4790 ??? This is a kludge, but consistent with the way this function has
4791 always operated and there doesn't seem to be a good way to avoid this
4793 if (TYPE_POINTER_TO (to_type
) != 0
4794 && TREE_CODE (TYPE_POINTER_TO (to_type
)) != POINTER_TYPE
)
4795 return TYPE_POINTER_TO (to_type
);
4797 /* First, if we already have an unqualified type for pointers to TO_TYPE
4798 and it's the proper mode, use it. */
4799 for (t
= TYPE_POINTER_TO (to_type
); t
; t
= TYPE_NEXT_PTR_TO (t
))
4800 if (TYPE_MODE (t
) == mode
4802 && TYPE_REF_CAN_ALIAS_ALL (t
) == can_alias_all
)
4805 t
= make_node (POINTER_TYPE
);
4807 TREE_TYPE (t
) = to_type
;
4808 TYPE_MODE (t
) = mode
;
4809 TYPE_REF_CAN_ALIAS_ALL (t
) = can_alias_all
;
4810 TYPE_NEXT_PTR_TO (t
) = TYPE_POINTER_TO (to_type
);
4811 TYPE_POINTER_TO (to_type
) = t
;
4813 /* Lay out the type. This function has many callers that are concerned
4814 with expression-construction, and this simplifies them all. */
4820 /* By default build pointers in ptr_mode. */
4823 build_pointer_type (tree to_type
)
4825 return build_pointer_type_for_mode (to_type
, ptr_mode
, false);
4828 /* Same as build_pointer_type_for_mode, but for REFERENCE_TYPE. */
4831 build_reference_type_for_mode (tree to_type
, enum machine_mode mode
,
4836 /* In some cases, languages will have things that aren't a REFERENCE_TYPE
4837 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_REFERENCE_TO.
4838 In that case, return that type without regard to the rest of our
4841 ??? This is a kludge, but consistent with the way this function has
4842 always operated and there doesn't seem to be a good way to avoid this
4844 if (TYPE_REFERENCE_TO (to_type
) != 0
4845 && TREE_CODE (TYPE_REFERENCE_TO (to_type
)) != REFERENCE_TYPE
)
4846 return TYPE_REFERENCE_TO (to_type
);
4848 /* First, if we already have an unqualified type for references to TO_TYPE
4849 and it's the proper mode, use it. */
4850 for (t
= TYPE_REFERENCE_TO (to_type
); t
; t
= TYPE_NEXT_REF_TO (t
))
4851 if (TYPE_MODE (t
) == mode
4853 && TYPE_REF_CAN_ALIAS_ALL (t
) == can_alias_all
)
4856 t
= make_node (REFERENCE_TYPE
);
4858 TREE_TYPE (t
) = to_type
;
4859 TYPE_MODE (t
) = mode
;
4860 TYPE_REF_CAN_ALIAS_ALL (t
) = can_alias_all
;
4861 TYPE_NEXT_REF_TO (t
) = TYPE_REFERENCE_TO (to_type
);
4862 TYPE_REFERENCE_TO (to_type
) = t
;
4870 /* Build the node for the type of references-to-TO_TYPE by default
4874 build_reference_type (tree to_type
)
4876 return build_reference_type_for_mode (to_type
, ptr_mode
, false);
4879 /* Build a type that is compatible with t but has no cv quals anywhere
4882 const char *const *const * -> char ***. */
4885 build_type_no_quals (tree t
)
4887 switch (TREE_CODE (t
))
4890 return build_pointer_type_for_mode (build_type_no_quals (TREE_TYPE (t
)),
4892 TYPE_REF_CAN_ALIAS_ALL (t
));
4893 case REFERENCE_TYPE
:
4895 build_reference_type_for_mode (build_type_no_quals (TREE_TYPE (t
)),
4897 TYPE_REF_CAN_ALIAS_ALL (t
));
4899 return TYPE_MAIN_VARIANT (t
);
4903 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
4904 MAXVAL should be the maximum value in the domain
4905 (one less than the length of the array).
4907 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
4908 We don't enforce this limit, that is up to caller (e.g. language front end).
4909 The limit exists because the result is a signed type and we don't handle
4910 sizes that use more than one HOST_WIDE_INT. */
4913 build_index_type (tree maxval
)
4915 tree itype
= make_node (INTEGER_TYPE
);
4917 TREE_TYPE (itype
) = sizetype
;
4918 TYPE_PRECISION (itype
) = TYPE_PRECISION (sizetype
);
4919 TYPE_MIN_VALUE (itype
) = size_zero_node
;
4920 TYPE_MAX_VALUE (itype
) = fold_convert (sizetype
, maxval
);
4921 TYPE_MODE (itype
) = TYPE_MODE (sizetype
);
4922 TYPE_SIZE (itype
) = TYPE_SIZE (sizetype
);
4923 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (sizetype
);
4924 TYPE_ALIGN (itype
) = TYPE_ALIGN (sizetype
);
4925 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (sizetype
);
4927 if (host_integerp (maxval
, 1))
4928 return type_hash_canon (tree_low_cst (maxval
, 1), itype
);
4933 /* Builds a signed or unsigned integer type of precision PRECISION.
4934 Used for C bitfields whose precision does not match that of
4935 built-in target types. */
4937 build_nonstandard_integer_type (unsigned HOST_WIDE_INT precision
,
4940 tree itype
= make_node (INTEGER_TYPE
);
4942 TYPE_PRECISION (itype
) = precision
;
4945 fixup_unsigned_type (itype
);
4947 fixup_signed_type (itype
);
4949 if (host_integerp (TYPE_MAX_VALUE (itype
), 1))
4950 return type_hash_canon (tree_low_cst (TYPE_MAX_VALUE (itype
), 1), itype
);
4955 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
4956 ENUMERAL_TYPE, BOOLEAN_TYPE, or CHAR_TYPE), with
4957 low bound LOWVAL and high bound HIGHVAL.
4958 if TYPE==NULL_TREE, sizetype is used. */
4961 build_range_type (tree type
, tree lowval
, tree highval
)
4963 tree itype
= make_node (INTEGER_TYPE
);
4965 TREE_TYPE (itype
) = type
;
4966 if (type
== NULL_TREE
)
4969 TYPE_MIN_VALUE (itype
) = convert (type
, lowval
);
4970 TYPE_MAX_VALUE (itype
) = highval
? convert (type
, highval
) : NULL
;
4972 TYPE_PRECISION (itype
) = TYPE_PRECISION (type
);
4973 TYPE_MODE (itype
) = TYPE_MODE (type
);
4974 TYPE_SIZE (itype
) = TYPE_SIZE (type
);
4975 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (type
);
4976 TYPE_ALIGN (itype
) = TYPE_ALIGN (type
);
4977 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (type
);
4979 if (host_integerp (lowval
, 0) && highval
!= 0 && host_integerp (highval
, 0))
4980 return type_hash_canon (tree_low_cst (highval
, 0)
4981 - tree_low_cst (lowval
, 0),
4987 /* Just like build_index_type, but takes lowval and highval instead
4988 of just highval (maxval). */
4991 build_index_2_type (tree lowval
, tree highval
)
4993 return build_range_type (sizetype
, lowval
, highval
);
4996 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
4997 and number of elements specified by the range of values of INDEX_TYPE.
4998 If such a type has already been constructed, reuse it. */
5001 build_array_type (tree elt_type
, tree index_type
)
5004 hashval_t hashcode
= 0;
5006 if (TREE_CODE (elt_type
) == FUNCTION_TYPE
)
5008 error ("arrays of functions are not meaningful");
5009 elt_type
= integer_type_node
;
5012 t
= make_node (ARRAY_TYPE
);
5013 TREE_TYPE (t
) = elt_type
;
5014 TYPE_DOMAIN (t
) = index_type
;
5016 if (index_type
== 0)
5022 hashcode
= iterative_hash_object (TYPE_HASH (elt_type
), hashcode
);
5023 hashcode
= iterative_hash_object (TYPE_HASH (index_type
), hashcode
);
5024 t
= type_hash_canon (hashcode
, t
);
5026 if (!COMPLETE_TYPE_P (t
))
5031 /* Return the TYPE of the elements comprising
5032 the innermost dimension of ARRAY. */
5035 get_inner_array_type (tree array
)
5037 tree type
= TREE_TYPE (array
);
5039 while (TREE_CODE (type
) == ARRAY_TYPE
)
5040 type
= TREE_TYPE (type
);
5045 /* Construct, lay out and return
5046 the type of functions returning type VALUE_TYPE
5047 given arguments of types ARG_TYPES.
5048 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
5049 are data type nodes for the arguments of the function.
5050 If such a type has already been constructed, reuse it. */
5053 build_function_type (tree value_type
, tree arg_types
)
5056 hashval_t hashcode
= 0;
5058 if (TREE_CODE (value_type
) == FUNCTION_TYPE
)
5060 error ("function return type cannot be function");
5061 value_type
= integer_type_node
;
5064 /* Make a node of the sort we want. */
5065 t
= make_node (FUNCTION_TYPE
);
5066 TREE_TYPE (t
) = value_type
;
5067 TYPE_ARG_TYPES (t
) = arg_types
;
5069 /* If we already have such a type, use the old one. */
5070 hashcode
= iterative_hash_object (TYPE_HASH (value_type
), hashcode
);
5071 hashcode
= type_hash_list (arg_types
, hashcode
);
5072 t
= type_hash_canon (hashcode
, t
);
5074 if (!COMPLETE_TYPE_P (t
))
5079 /* Build a function type. The RETURN_TYPE is the type returned by the
5080 function. If additional arguments are provided, they are
5081 additional argument types. The list of argument types must always
5082 be terminated by NULL_TREE. */
5085 build_function_type_list (tree return_type
, ...)
5090 va_start (p
, return_type
);
5092 t
= va_arg (p
, tree
);
5093 for (args
= NULL_TREE
; t
!= NULL_TREE
; t
= va_arg (p
, tree
))
5094 args
= tree_cons (NULL_TREE
, t
, args
);
5096 if (args
== NULL_TREE
)
5097 args
= void_list_node
;
5101 args
= nreverse (args
);
5102 TREE_CHAIN (last
) = void_list_node
;
5104 args
= build_function_type (return_type
, args
);
5110 /* Build a METHOD_TYPE for a member of BASETYPE. The RETTYPE (a TYPE)
5111 and ARGTYPES (a TREE_LIST) are the return type and arguments types
5112 for the method. An implicit additional parameter (of type
5113 pointer-to-BASETYPE) is added to the ARGTYPES. */
5116 build_method_type_directly (tree basetype
,
5124 /* Make a node of the sort we want. */
5125 t
= make_node (METHOD_TYPE
);
5127 TYPE_METHOD_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
5128 TREE_TYPE (t
) = rettype
;
5129 ptype
= build_pointer_type (basetype
);
5131 /* The actual arglist for this function includes a "hidden" argument
5132 which is "this". Put it into the list of argument types. */
5133 argtypes
= tree_cons (NULL_TREE
, ptype
, argtypes
);
5134 TYPE_ARG_TYPES (t
) = argtypes
;
5136 /* If we already have such a type, use the old one. */
5137 hashcode
= iterative_hash_object (TYPE_HASH (basetype
), hashcode
);
5138 hashcode
= iterative_hash_object (TYPE_HASH (rettype
), hashcode
);
5139 hashcode
= type_hash_list (argtypes
, hashcode
);
5140 t
= type_hash_canon (hashcode
, t
);
5142 if (!COMPLETE_TYPE_P (t
))
5148 /* Construct, lay out and return the type of methods belonging to class
5149 BASETYPE and whose arguments and values are described by TYPE.
5150 If that type exists already, reuse it.
5151 TYPE must be a FUNCTION_TYPE node. */
5154 build_method_type (tree basetype
, tree type
)
5156 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
5158 return build_method_type_directly (basetype
,
5160 TYPE_ARG_TYPES (type
));
5163 /* Construct, lay out and return the type of offsets to a value
5164 of type TYPE, within an object of type BASETYPE.
5165 If a suitable offset type exists already, reuse it. */
5168 build_offset_type (tree basetype
, tree type
)
5171 hashval_t hashcode
= 0;
5173 /* Make a node of the sort we want. */
5174 t
= make_node (OFFSET_TYPE
);
5176 TYPE_OFFSET_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
5177 TREE_TYPE (t
) = type
;
5179 /* If we already have such a type, use the old one. */
5180 hashcode
= iterative_hash_object (TYPE_HASH (basetype
), hashcode
);
5181 hashcode
= iterative_hash_object (TYPE_HASH (type
), hashcode
);
5182 t
= type_hash_canon (hashcode
, t
);
5184 if (!COMPLETE_TYPE_P (t
))
5190 /* Create a complex type whose components are COMPONENT_TYPE. */
5193 build_complex_type (tree component_type
)
5198 /* Make a node of the sort we want. */
5199 t
= make_node (COMPLEX_TYPE
);
5201 TREE_TYPE (t
) = TYPE_MAIN_VARIANT (component_type
);
5203 /* If we already have such a type, use the old one. */
5204 hashcode
= iterative_hash_object (TYPE_HASH (component_type
), 0);
5205 t
= type_hash_canon (hashcode
, t
);
5207 if (!COMPLETE_TYPE_P (t
))
5210 /* If we are writing Dwarf2 output we need to create a name,
5211 since complex is a fundamental type. */
5212 if ((write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
5216 if (component_type
== char_type_node
)
5217 name
= "complex char";
5218 else if (component_type
== signed_char_type_node
)
5219 name
= "complex signed char";
5220 else if (component_type
== unsigned_char_type_node
)
5221 name
= "complex unsigned char";
5222 else if (component_type
== short_integer_type_node
)
5223 name
= "complex short int";
5224 else if (component_type
== short_unsigned_type_node
)
5225 name
= "complex short unsigned int";
5226 else if (component_type
== integer_type_node
)
5227 name
= "complex int";
5228 else if (component_type
== unsigned_type_node
)
5229 name
= "complex unsigned int";
5230 else if (component_type
== long_integer_type_node
)
5231 name
= "complex long int";
5232 else if (component_type
== long_unsigned_type_node
)
5233 name
= "complex long unsigned int";
5234 else if (component_type
== long_long_integer_type_node
)
5235 name
= "complex long long int";
5236 else if (component_type
== long_long_unsigned_type_node
)
5237 name
= "complex long long unsigned int";
5242 TYPE_NAME (t
) = get_identifier (name
);
5245 return build_qualified_type (t
, TYPE_QUALS (component_type
));
5248 /* Return OP, stripped of any conversions to wider types as much as is safe.
5249 Converting the value back to OP's type makes a value equivalent to OP.
5251 If FOR_TYPE is nonzero, we return a value which, if converted to
5252 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
5254 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
5255 narrowest type that can hold the value, even if they don't exactly fit.
5256 Otherwise, bit-field references are changed to a narrower type
5257 only if they can be fetched directly from memory in that type.
5259 OP must have integer, real or enumeral type. Pointers are not allowed!
5261 There are some cases where the obvious value we could return
5262 would regenerate to OP if converted to OP's type,
5263 but would not extend like OP to wider types.
5264 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
5265 For example, if OP is (unsigned short)(signed char)-1,
5266 we avoid returning (signed char)-1 if FOR_TYPE is int,
5267 even though extending that to an unsigned short would regenerate OP,
5268 since the result of extending (signed char)-1 to (int)
5269 is different from (int) OP. */
5272 get_unwidened (tree op
, tree for_type
)
5274 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
5275 tree type
= TREE_TYPE (op
);
5277 = TYPE_PRECISION (for_type
!= 0 ? for_type
: type
);
5279 = (for_type
!= 0 && for_type
!= type
5280 && final_prec
> TYPE_PRECISION (type
)
5281 && TYPE_UNSIGNED (type
));
5284 while (TREE_CODE (op
) == NOP_EXPR
5285 || TREE_CODE (op
) == CONVERT_EXPR
)
5289 /* TYPE_PRECISION on vector types has different meaning
5290 (TYPE_VECTOR_SUBPARTS) and casts from vectors are view conversions,
5291 so avoid them here. */
5292 if (TREE_CODE (TREE_TYPE (TREE_OPERAND (op
, 0))) == VECTOR_TYPE
)
5295 bitschange
= TYPE_PRECISION (TREE_TYPE (op
))
5296 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0)));
5298 /* Truncations are many-one so cannot be removed.
5299 Unless we are later going to truncate down even farther. */
5301 && final_prec
> TYPE_PRECISION (TREE_TYPE (op
)))
5304 /* See what's inside this conversion. If we decide to strip it,
5306 op
= TREE_OPERAND (op
, 0);
5308 /* If we have not stripped any zero-extensions (uns is 0),
5309 we can strip any kind of extension.
5310 If we have previously stripped a zero-extension,
5311 only zero-extensions can safely be stripped.
5312 Any extension can be stripped if the bits it would produce
5313 are all going to be discarded later by truncating to FOR_TYPE. */
5317 if (! uns
|| final_prec
<= TYPE_PRECISION (TREE_TYPE (op
)))
5319 /* TYPE_UNSIGNED says whether this is a zero-extension.
5320 Let's avoid computing it if it does not affect WIN
5321 and if UNS will not be needed again. */
5323 || TREE_CODE (op
) == NOP_EXPR
5324 || TREE_CODE (op
) == CONVERT_EXPR
)
5325 && TYPE_UNSIGNED (TREE_TYPE (op
)))
5333 if (TREE_CODE (op
) == COMPONENT_REF
5334 /* Since type_for_size always gives an integer type. */
5335 && TREE_CODE (type
) != REAL_TYPE
5336 /* Don't crash if field not laid out yet. */
5337 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
5338 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
5340 unsigned int innerprec
5341 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
5342 int unsignedp
= (DECL_UNSIGNED (TREE_OPERAND (op
, 1))
5343 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op
, 1))));
5344 type
= lang_hooks
.types
.type_for_size (innerprec
, unsignedp
);
5346 /* We can get this structure field in the narrowest type it fits in.
5347 If FOR_TYPE is 0, do this only for a field that matches the
5348 narrower type exactly and is aligned for it
5349 The resulting extension to its nominal type (a fullword type)
5350 must fit the same conditions as for other extensions. */
5353 && INT_CST_LT_UNSIGNED (TYPE_SIZE (type
), TYPE_SIZE (TREE_TYPE (op
)))
5354 && (for_type
|| ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1)))
5355 && (! uns
|| final_prec
<= innerprec
|| unsignedp
))
5357 win
= build3 (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
5358 TREE_OPERAND (op
, 1), NULL_TREE
);
5359 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
5360 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
5367 /* Return OP or a simpler expression for a narrower value
5368 which can be sign-extended or zero-extended to give back OP.
5369 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
5370 or 0 if the value should be sign-extended. */
5373 get_narrower (tree op
, int *unsignedp_ptr
)
5378 bool integral_p
= INTEGRAL_TYPE_P (TREE_TYPE (op
));
5380 while (TREE_CODE (op
) == NOP_EXPR
)
5383 = (TYPE_PRECISION (TREE_TYPE (op
))
5384 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0))));
5386 /* Truncations are many-one so cannot be removed. */
5390 /* See what's inside this conversion. If we decide to strip it,
5395 op
= TREE_OPERAND (op
, 0);
5396 /* An extension: the outermost one can be stripped,
5397 but remember whether it is zero or sign extension. */
5399 uns
= TYPE_UNSIGNED (TREE_TYPE (op
));
5400 /* Otherwise, if a sign extension has been stripped,
5401 only sign extensions can now be stripped;
5402 if a zero extension has been stripped, only zero-extensions. */
5403 else if (uns
!= TYPE_UNSIGNED (TREE_TYPE (op
)))
5407 else /* bitschange == 0 */
5409 /* A change in nominal type can always be stripped, but we must
5410 preserve the unsignedness. */
5412 uns
= TYPE_UNSIGNED (TREE_TYPE (op
));
5414 op
= TREE_OPERAND (op
, 0);
5415 /* Keep trying to narrow, but don't assign op to win if it
5416 would turn an integral type into something else. */
5417 if (INTEGRAL_TYPE_P (TREE_TYPE (op
)) != integral_p
)
5424 if (TREE_CODE (op
) == COMPONENT_REF
5425 /* Since type_for_size always gives an integer type. */
5426 && TREE_CODE (TREE_TYPE (op
)) != REAL_TYPE
5427 /* Ensure field is laid out already. */
5428 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
5429 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
5431 unsigned HOST_WIDE_INT innerprec
5432 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
5433 int unsignedp
= (DECL_UNSIGNED (TREE_OPERAND (op
, 1))
5434 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op
, 1))));
5435 tree type
= lang_hooks
.types
.type_for_size (innerprec
, unsignedp
);
5437 /* We can get this structure field in a narrower type that fits it,
5438 but the resulting extension to its nominal type (a fullword type)
5439 must satisfy the same conditions as for other extensions.
5441 Do this only for fields that are aligned (not bit-fields),
5442 because when bit-field insns will be used there is no
5443 advantage in doing this. */
5445 if (innerprec
< TYPE_PRECISION (TREE_TYPE (op
))
5446 && ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1))
5447 && (first
|| uns
== DECL_UNSIGNED (TREE_OPERAND (op
, 1)))
5451 uns
= DECL_UNSIGNED (TREE_OPERAND (op
, 1));
5452 win
= build3 (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
5453 TREE_OPERAND (op
, 1), NULL_TREE
);
5454 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
5455 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
5458 *unsignedp_ptr
= uns
;
5462 /* Nonzero if integer constant C has a value that is permissible
5463 for type TYPE (an INTEGER_TYPE). */
5466 int_fits_type_p (tree c
, tree type
)
5468 tree type_low_bound
= TYPE_MIN_VALUE (type
);
5469 tree type_high_bound
= TYPE_MAX_VALUE (type
);
5470 bool ok_for_low_bound
, ok_for_high_bound
;
5473 /* If at least one bound of the type is a constant integer, we can check
5474 ourselves and maybe make a decision. If no such decision is possible, but
5475 this type is a subtype, try checking against that. Otherwise, use
5476 force_fit_type, which checks against the precision.
5478 Compute the status for each possibly constant bound, and return if we see
5479 one does not match. Use ok_for_xxx_bound for this purpose, assigning -1
5480 for "unknown if constant fits", 0 for "constant known *not* to fit" and 1
5481 for "constant known to fit". */
5483 /* Check if C >= type_low_bound. */
5484 if (type_low_bound
&& TREE_CODE (type_low_bound
) == INTEGER_CST
)
5486 if (tree_int_cst_lt (c
, type_low_bound
))
5488 ok_for_low_bound
= true;
5491 ok_for_low_bound
= false;
5493 /* Check if c <= type_high_bound. */
5494 if (type_high_bound
&& TREE_CODE (type_high_bound
) == INTEGER_CST
)
5496 if (tree_int_cst_lt (type_high_bound
, c
))
5498 ok_for_high_bound
= true;
5501 ok_for_high_bound
= false;
5503 /* If the constant fits both bounds, the result is known. */
5504 if (ok_for_low_bound
&& ok_for_high_bound
)
5507 /* Perform some generic filtering which may allow making a decision
5508 even if the bounds are not constant. First, negative integers
5509 never fit in unsigned types, */
5510 if (TYPE_UNSIGNED (type
) && tree_int_cst_sgn (c
) < 0)
5513 /* Second, narrower types always fit in wider ones. */
5514 if (TYPE_PRECISION (type
) > TYPE_PRECISION (TREE_TYPE (c
)))
5517 /* Third, unsigned integers with top bit set never fit signed types. */
5518 if (! TYPE_UNSIGNED (type
)
5519 && TYPE_UNSIGNED (TREE_TYPE (c
))
5520 && tree_int_cst_msb (c
))
5523 /* If we haven't been able to decide at this point, there nothing more we
5524 can check ourselves here. Look at the base type if we have one and it
5525 has the same precision. */
5526 if (TREE_CODE (type
) == INTEGER_TYPE
5527 && TREE_TYPE (type
) != 0
5528 && TYPE_PRECISION (type
) == TYPE_PRECISION (TREE_TYPE (type
)))
5529 return int_fits_type_p (c
, TREE_TYPE (type
));
5531 /* Or to force_fit_type, if nothing else. */
5532 tmp
= copy_node (c
);
5533 TREE_TYPE (tmp
) = type
;
5534 tmp
= force_fit_type (tmp
, -1, false, false);
5535 return TREE_INT_CST_HIGH (tmp
) == TREE_INT_CST_HIGH (c
)
5536 && TREE_INT_CST_LOW (tmp
) == TREE_INT_CST_LOW (c
);
5539 /* Subprogram of following function. Called by walk_tree.
5541 Return *TP if it is an automatic variable or parameter of the
5542 function passed in as DATA. */
5545 find_var_from_fn (tree
*tp
, int *walk_subtrees
, void *data
)
5547 tree fn
= (tree
) data
;
5552 else if (DECL_P (*tp
)
5553 && lang_hooks
.tree_inlining
.auto_var_in_fn_p (*tp
, fn
))
5559 /* Returns true if T is, contains, or refers to a type with variable
5560 size. If FN is nonzero, only return true if a modifier of the type
5561 or position of FN is a variable or parameter inside FN.
5563 This concept is more general than that of C99 'variably modified types':
5564 in C99, a struct type is never variably modified because a VLA may not
5565 appear as a structure member. However, in GNU C code like:
5567 struct S { int i[f()]; };
5569 is valid, and other languages may define similar constructs. */
5572 variably_modified_type_p (tree type
, tree fn
)
5576 /* Test if T is either variable (if FN is zero) or an expression containing
5577 a variable in FN. */
5578 #define RETURN_TRUE_IF_VAR(T) \
5579 do { tree _t = (T); \
5580 if (_t && _t != error_mark_node && TREE_CODE (_t) != INTEGER_CST \
5581 && (!fn || walk_tree (&_t, find_var_from_fn, fn, NULL))) \
5582 return true; } while (0)
5584 if (type
== error_mark_node
)
5587 /* If TYPE itself has variable size, it is variably modified.
5589 We do not yet have a representation of the C99 '[*]' syntax.
5590 When a representation is chosen, this function should be modified
5591 to test for that case as well. */
5592 RETURN_TRUE_IF_VAR (TYPE_SIZE (type
));
5593 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT(type
));
5595 switch (TREE_CODE (type
))
5598 case REFERENCE_TYPE
:
5601 if (variably_modified_type_p (TREE_TYPE (type
), fn
))
5607 /* If TYPE is a function type, it is variably modified if any of the
5608 parameters or the return type are variably modified. */
5609 if (variably_modified_type_p (TREE_TYPE (type
), fn
))
5612 for (t
= TYPE_ARG_TYPES (type
);
5613 t
&& t
!= void_list_node
;
5615 if (variably_modified_type_p (TREE_VALUE (t
), fn
))
5624 /* Scalar types are variably modified if their end points
5626 RETURN_TRUE_IF_VAR (TYPE_MIN_VALUE (type
));
5627 RETURN_TRUE_IF_VAR (TYPE_MAX_VALUE (type
));
5632 case QUAL_UNION_TYPE
:
5633 /* We can't see if any of the field are variably-modified by the
5634 definition we normally use, since that would produce infinite
5635 recursion via pointers. */
5636 /* This is variably modified if some field's type is. */
5637 for (t
= TYPE_FIELDS (type
); t
; t
= TREE_CHAIN (t
))
5638 if (TREE_CODE (t
) == FIELD_DECL
)
5640 RETURN_TRUE_IF_VAR (DECL_FIELD_OFFSET (t
));
5641 RETURN_TRUE_IF_VAR (DECL_SIZE (t
));
5642 RETURN_TRUE_IF_VAR (DECL_SIZE_UNIT (t
));
5644 if (TREE_CODE (type
) == QUAL_UNION_TYPE
)
5645 RETURN_TRUE_IF_VAR (DECL_QUALIFIER (t
));
5653 /* The current language may have other cases to check, but in general,
5654 all other types are not variably modified. */
5655 return lang_hooks
.tree_inlining
.var_mod_type_p (type
, fn
);
5657 #undef RETURN_TRUE_IF_VAR
5660 /* Given a DECL or TYPE, return the scope in which it was declared, or
5661 NULL_TREE if there is no containing scope. */
5664 get_containing_scope (tree t
)
5666 return (TYPE_P (t
) ? TYPE_CONTEXT (t
) : DECL_CONTEXT (t
));
5669 /* Return the innermost context enclosing DECL that is
5670 a FUNCTION_DECL, or zero if none. */
5673 decl_function_context (tree decl
)
5677 if (TREE_CODE (decl
) == ERROR_MARK
)
5680 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
5681 where we look up the function at runtime. Such functions always take
5682 a first argument of type 'pointer to real context'.
5684 C++ should really be fixed to use DECL_CONTEXT for the real context,
5685 and use something else for the "virtual context". */
5686 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_VINDEX (decl
))
5689 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl
)))));
5691 context
= DECL_CONTEXT (decl
);
5693 while (context
&& TREE_CODE (context
) != FUNCTION_DECL
)
5695 if (TREE_CODE (context
) == BLOCK
)
5696 context
= BLOCK_SUPERCONTEXT (context
);
5698 context
= get_containing_scope (context
);
5704 /* Return the innermost context enclosing DECL that is
5705 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
5706 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
5709 decl_type_context (tree decl
)
5711 tree context
= DECL_CONTEXT (decl
);
5714 switch (TREE_CODE (context
))
5716 case NAMESPACE_DECL
:
5717 case TRANSLATION_UNIT_DECL
:
5722 case QUAL_UNION_TYPE
:
5727 context
= DECL_CONTEXT (context
);
5731 context
= BLOCK_SUPERCONTEXT (context
);
5741 /* CALL is a CALL_EXPR. Return the declaration for the function
5742 called, or NULL_TREE if the called function cannot be
5746 get_callee_fndecl (tree call
)
5750 /* It's invalid to call this function with anything but a
5752 gcc_assert (TREE_CODE (call
) == CALL_EXPR
);
5754 /* The first operand to the CALL is the address of the function
5756 addr
= TREE_OPERAND (call
, 0);
5760 /* If this is a readonly function pointer, extract its initial value. */
5761 if (DECL_P (addr
) && TREE_CODE (addr
) != FUNCTION_DECL
5762 && TREE_READONLY (addr
) && ! TREE_THIS_VOLATILE (addr
)
5763 && DECL_INITIAL (addr
))
5764 addr
= DECL_INITIAL (addr
);
5766 /* If the address is just `&f' for some function `f', then we know
5767 that `f' is being called. */
5768 if (TREE_CODE (addr
) == ADDR_EXPR
5769 && TREE_CODE (TREE_OPERAND (addr
, 0)) == FUNCTION_DECL
)
5770 return TREE_OPERAND (addr
, 0);
5772 /* We couldn't figure out what was being called. Maybe the front
5773 end has some idea. */
5774 return lang_hooks
.lang_get_callee_fndecl (call
);
5777 /* Print debugging information about tree nodes generated during the compile,
5778 and any language-specific information. */
5781 dump_tree_statistics (void)
5783 #ifdef GATHER_STATISTICS
5785 int total_nodes
, total_bytes
;
5788 fprintf (stderr
, "\n??? tree nodes created\n\n");
5789 #ifdef GATHER_STATISTICS
5790 fprintf (stderr
, "Kind Nodes Bytes\n");
5791 fprintf (stderr
, "---------------------------------------\n");
5792 total_nodes
= total_bytes
= 0;
5793 for (i
= 0; i
< (int) all_kinds
; i
++)
5795 fprintf (stderr
, "%-20s %7d %10d\n", tree_node_kind_names
[i
],
5796 tree_node_counts
[i
], tree_node_sizes
[i
]);
5797 total_nodes
+= tree_node_counts
[i
];
5798 total_bytes
+= tree_node_sizes
[i
];
5800 fprintf (stderr
, "---------------------------------------\n");
5801 fprintf (stderr
, "%-20s %7d %10d\n", "Total", total_nodes
, total_bytes
);
5802 fprintf (stderr
, "---------------------------------------\n");
5803 ssanames_print_statistics ();
5804 phinodes_print_statistics ();
5806 fprintf (stderr
, "(No per-node statistics)\n");
5808 print_type_hash_statistics ();
5809 print_debug_expr_statistics ();
5810 print_value_expr_statistics ();
5811 print_restrict_base_statistics ();
5812 lang_hooks
.print_statistics ();
5815 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
5817 /* Generate a crc32 of a string. */
5820 crc32_string (unsigned chksum
, const char *string
)
5824 unsigned value
= *string
<< 24;
5827 for (ix
= 8; ix
--; value
<<= 1)
5831 feedback
= (value
^ chksum
) & 0x80000000 ? 0x04c11db7 : 0;
5840 /* P is a string that will be used in a symbol. Mask out any characters
5841 that are not valid in that context. */
5844 clean_symbol_name (char *p
)
5848 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
5851 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
5858 /* Generate a name for a function unique to this translation unit.
5859 TYPE is some string to identify the purpose of this function to the
5860 linker or collect2. */
5863 get_file_function_name_long (const char *type
)
5869 if (first_global_object_name
)
5870 p
= first_global_object_name
;
5873 /* We don't have anything that we know to be unique to this translation
5874 unit, so use what we do have and throw in some randomness. */
5876 const char *name
= weak_global_object_name
;
5877 const char *file
= main_input_filename
;
5882 file
= input_filename
;
5884 len
= strlen (file
);
5885 q
= alloca (9 * 2 + len
+ 1);
5886 memcpy (q
, file
, len
+ 1);
5887 clean_symbol_name (q
);
5889 sprintf (q
+ len
, "_%08X_%08X", crc32_string (0, name
),
5890 crc32_string (0, flag_random_seed
));
5895 buf
= alloca (sizeof (FILE_FUNCTION_FORMAT
) + strlen (p
) + strlen (type
));
5897 /* Set up the name of the file-level functions we may need.
5898 Use a global object (which is already required to be unique over
5899 the program) rather than the file name (which imposes extra
5901 sprintf (buf
, FILE_FUNCTION_FORMAT
, type
, p
);
5903 return get_identifier (buf
);
5906 /* If KIND=='I', return a suitable global initializer (constructor) name.
5907 If KIND=='D', return a suitable global clean-up (destructor) name. */
5910 get_file_function_name (int kind
)
5917 return get_file_function_name_long (p
);
5920 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
5922 /* Complain that the tree code of NODE does not match the expected 0
5923 terminated list of trailing codes. The trailing code list can be
5924 empty, for a more vague error message. FILE, LINE, and FUNCTION
5925 are of the caller. */
5928 tree_check_failed (const tree node
, const char *file
,
5929 int line
, const char *function
, ...)
5933 unsigned length
= 0;
5936 va_start (args
, function
);
5937 while ((code
= va_arg (args
, int)))
5938 length
+= 4 + strlen (tree_code_name
[code
]);
5942 va_start (args
, function
);
5943 length
+= strlen ("expected ");
5944 buffer
= alloca (length
);
5946 while ((code
= va_arg (args
, int)))
5948 const char *prefix
= length
? " or " : "expected ";
5950 strcpy (buffer
+ length
, prefix
);
5951 length
+= strlen (prefix
);
5952 strcpy (buffer
+ length
, tree_code_name
[code
]);
5953 length
+= strlen (tree_code_name
[code
]);
5958 buffer
= (char *)"unexpected node";
5960 internal_error ("tree check: %s, have %s in %s, at %s:%d",
5961 buffer
, tree_code_name
[TREE_CODE (node
)],
5962 function
, trim_filename (file
), line
);
5965 /* Complain that the tree code of NODE does match the expected 0
5966 terminated list of trailing codes. FILE, LINE, and FUNCTION are of
5970 tree_not_check_failed (const tree node
, const char *file
,
5971 int line
, const char *function
, ...)
5975 unsigned length
= 0;
5978 va_start (args
, function
);
5979 while ((code
= va_arg (args
, int)))
5980 length
+= 4 + strlen (tree_code_name
[code
]);
5982 va_start (args
, function
);
5983 buffer
= alloca (length
);
5985 while ((code
= va_arg (args
, int)))
5989 strcpy (buffer
+ length
, " or ");
5992 strcpy (buffer
+ length
, tree_code_name
[code
]);
5993 length
+= strlen (tree_code_name
[code
]);
5997 internal_error ("tree check: expected none of %s, have %s in %s, at %s:%d",
5998 buffer
, tree_code_name
[TREE_CODE (node
)],
5999 function
, trim_filename (file
), line
);
6002 /* Similar to tree_check_failed, except that we check for a class of tree
6003 code, given in CL. */
6006 tree_class_check_failed (const tree node
, const enum tree_code_class cl
,
6007 const char *file
, int line
, const char *function
)
6010 ("tree check: expected class %qs, have %qs (%s) in %s, at %s:%d",
6011 TREE_CODE_CLASS_STRING (cl
),
6012 TREE_CODE_CLASS_STRING (TREE_CODE_CLASS (TREE_CODE (node
))),
6013 tree_code_name
[TREE_CODE (node
)], function
, trim_filename (file
), line
);
6015 #undef DEFTREESTRUCT
6016 #define DEFTREESTRUCT(VAL, NAME) NAME,
6018 static const char *ts_enum_names
[] = {
6019 #include "treestruct.def"
6021 #undef DEFTREESTRUCT
6023 #define TS_ENUM_NAME(EN) (ts_enum_names[(EN)])
6025 /* Similar to tree_class_check_failed, except that we check for
6026 whether CODE contains the tree structure identified by EN. */
6029 tree_contains_struct_check_failed (const tree node
,
6030 const enum tree_node_structure_enum en
,
6031 const char *file
, int line
,
6032 const char *function
)
6035 ("tree check: expected tree that contains %qs structure, have %qs in %s, at %s:%d",
6037 tree_code_name
[TREE_CODE (node
)], function
, trim_filename (file
), line
);
6041 /* Similar to above, except that the check is for the bounds of a TREE_VEC's
6042 (dynamically sized) vector. */
6045 tree_vec_elt_check_failed (int idx
, int len
, const char *file
, int line
,
6046 const char *function
)
6049 ("tree check: accessed elt %d of tree_vec with %d elts in %s, at %s:%d",
6050 idx
+ 1, len
, function
, trim_filename (file
), line
);
6053 /* Similar to above, except that the check is for the bounds of a PHI_NODE's
6054 (dynamically sized) vector. */
6057 phi_node_elt_check_failed (int idx
, int len
, const char *file
, int line
,
6058 const char *function
)
6061 ("tree check: accessed elt %d of phi_node with %d elts in %s, at %s:%d",
6062 idx
+ 1, len
, function
, trim_filename (file
), line
);
6065 /* Similar to above, except that the check is for the bounds of the operand
6066 vector of an expression node. */
6069 tree_operand_check_failed (int idx
, enum tree_code code
, const char *file
,
6070 int line
, const char *function
)
6073 ("tree check: accessed operand %d of %s with %d operands in %s, at %s:%d",
6074 idx
+ 1, tree_code_name
[code
], TREE_CODE_LENGTH (code
),
6075 function
, trim_filename (file
), line
);
6077 #endif /* ENABLE_TREE_CHECKING */
6079 /* Create a new vector type node holding SUBPARTS units of type INNERTYPE,
6080 and mapped to the machine mode MODE. Initialize its fields and build
6081 the information necessary for debugging output. */
6084 make_vector_type (tree innertype
, int nunits
, enum machine_mode mode
)
6086 tree t
= make_node (VECTOR_TYPE
);
6088 TREE_TYPE (t
) = TYPE_MAIN_VARIANT (innertype
);
6089 SET_TYPE_VECTOR_SUBPARTS (t
, nunits
);
6090 TYPE_MODE (t
) = mode
;
6091 TYPE_READONLY (t
) = TYPE_READONLY (innertype
);
6092 TYPE_VOLATILE (t
) = TYPE_VOLATILE (innertype
);
6097 tree index
= build_int_cst (NULL_TREE
, nunits
- 1);
6098 tree array
= build_array_type (innertype
, build_index_type (index
));
6099 tree rt
= make_node (RECORD_TYPE
);
6101 TYPE_FIELDS (rt
) = build_decl (FIELD_DECL
, get_identifier ("f"), array
);
6102 DECL_CONTEXT (TYPE_FIELDS (rt
)) = rt
;
6104 TYPE_DEBUG_REPRESENTATION_TYPE (t
) = rt
;
6105 /* In dwarfout.c, type lookup uses TYPE_UID numbers. We want to output
6106 the representation type, and we want to find that die when looking up
6107 the vector type. This is most easily achieved by making the TYPE_UID
6109 TYPE_UID (rt
) = TYPE_UID (t
);
6112 /* Build our main variant, based on the main variant of the inner type. */
6113 if (TYPE_MAIN_VARIANT (innertype
) != innertype
)
6115 tree innertype_main_variant
= TYPE_MAIN_VARIANT (innertype
);
6116 unsigned int hash
= TYPE_HASH (innertype_main_variant
);
6117 TYPE_MAIN_VARIANT (t
)
6118 = type_hash_canon (hash
, make_vector_type (innertype_main_variant
,
6126 make_or_reuse_type (unsigned size
, int unsignedp
)
6128 if (size
== INT_TYPE_SIZE
)
6129 return unsignedp
? unsigned_type_node
: integer_type_node
;
6130 if (size
== CHAR_TYPE_SIZE
)
6131 return unsignedp
? unsigned_char_type_node
: signed_char_type_node
;
6132 if (size
== SHORT_TYPE_SIZE
)
6133 return unsignedp
? short_unsigned_type_node
: short_integer_type_node
;
6134 if (size
== LONG_TYPE_SIZE
)
6135 return unsignedp
? long_unsigned_type_node
: long_integer_type_node
;
6136 if (size
== LONG_LONG_TYPE_SIZE
)
6137 return (unsignedp
? long_long_unsigned_type_node
6138 : long_long_integer_type_node
);
6141 return make_unsigned_type (size
);
6143 return make_signed_type (size
);
6146 /* Create nodes for all integer types (and error_mark_node) using the sizes
6147 of C datatypes. The caller should call set_sizetype soon after calling
6148 this function to select one of the types as sizetype. */
6151 build_common_tree_nodes (bool signed_char
, bool signed_sizetype
)
6153 error_mark_node
= make_node (ERROR_MARK
);
6154 TREE_TYPE (error_mark_node
) = error_mark_node
;
6156 initialize_sizetypes (signed_sizetype
);
6158 /* Define both `signed char' and `unsigned char'. */
6159 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
6160 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
6162 /* Define `char', which is like either `signed char' or `unsigned char'
6163 but not the same as either. */
6166 ? make_signed_type (CHAR_TYPE_SIZE
)
6167 : make_unsigned_type (CHAR_TYPE_SIZE
));
6169 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
6170 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
6171 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
6172 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
6173 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
6174 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
6175 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
6176 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
6178 /* Define a boolean type. This type only represents boolean values but
6179 may be larger than char depending on the value of BOOL_TYPE_SIZE.
6180 Front ends which want to override this size (i.e. Java) can redefine
6181 boolean_type_node before calling build_common_tree_nodes_2. */
6182 boolean_type_node
= make_unsigned_type (BOOL_TYPE_SIZE
);
6183 TREE_SET_CODE (boolean_type_node
, BOOLEAN_TYPE
);
6184 TYPE_MAX_VALUE (boolean_type_node
) = build_int_cst (boolean_type_node
, 1);
6185 TYPE_PRECISION (boolean_type_node
) = 1;
6187 /* Fill in the rest of the sized types. Reuse existing type nodes
6189 intQI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (QImode
), 0);
6190 intHI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (HImode
), 0);
6191 intSI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (SImode
), 0);
6192 intDI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (DImode
), 0);
6193 intTI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (TImode
), 0);
6195 unsigned_intQI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (QImode
), 1);
6196 unsigned_intHI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (HImode
), 1);
6197 unsigned_intSI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (SImode
), 1);
6198 unsigned_intDI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (DImode
), 1);
6199 unsigned_intTI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (TImode
), 1);
6201 access_public_node
= get_identifier ("public");
6202 access_protected_node
= get_identifier ("protected");
6203 access_private_node
= get_identifier ("private");
6206 /* Call this function after calling build_common_tree_nodes and set_sizetype.
6207 It will create several other common tree nodes. */
6210 build_common_tree_nodes_2 (int short_double
)
6212 /* Define these next since types below may used them. */
6213 integer_zero_node
= build_int_cst (NULL_TREE
, 0);
6214 integer_one_node
= build_int_cst (NULL_TREE
, 1);
6215 integer_minus_one_node
= build_int_cst (NULL_TREE
, -1);
6217 size_zero_node
= size_int (0);
6218 size_one_node
= size_int (1);
6219 bitsize_zero_node
= bitsize_int (0);
6220 bitsize_one_node
= bitsize_int (1);
6221 bitsize_unit_node
= bitsize_int (BITS_PER_UNIT
);
6223 boolean_false_node
= TYPE_MIN_VALUE (boolean_type_node
);
6224 boolean_true_node
= TYPE_MAX_VALUE (boolean_type_node
);
6226 void_type_node
= make_node (VOID_TYPE
);
6227 layout_type (void_type_node
);
6229 /* We are not going to have real types in C with less than byte alignment,
6230 so we might as well not have any types that claim to have it. */
6231 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
6232 TYPE_USER_ALIGN (void_type_node
) = 0;
6234 null_pointer_node
= build_int_cst (build_pointer_type (void_type_node
), 0);
6235 layout_type (TREE_TYPE (null_pointer_node
));
6237 ptr_type_node
= build_pointer_type (void_type_node
);
6239 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
6240 fileptr_type_node
= ptr_type_node
;
6242 float_type_node
= make_node (REAL_TYPE
);
6243 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
6244 layout_type (float_type_node
);
6246 double_type_node
= make_node (REAL_TYPE
);
6248 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
6250 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
6251 layout_type (double_type_node
);
6253 long_double_type_node
= make_node (REAL_TYPE
);
6254 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
6255 layout_type (long_double_type_node
);
6257 float_ptr_type_node
= build_pointer_type (float_type_node
);
6258 double_ptr_type_node
= build_pointer_type (double_type_node
);
6259 long_double_ptr_type_node
= build_pointer_type (long_double_type_node
);
6260 integer_ptr_type_node
= build_pointer_type (integer_type_node
);
6262 complex_integer_type_node
= make_node (COMPLEX_TYPE
);
6263 TREE_TYPE (complex_integer_type_node
) = integer_type_node
;
6264 layout_type (complex_integer_type_node
);
6266 complex_float_type_node
= make_node (COMPLEX_TYPE
);
6267 TREE_TYPE (complex_float_type_node
) = float_type_node
;
6268 layout_type (complex_float_type_node
);
6270 complex_double_type_node
= make_node (COMPLEX_TYPE
);
6271 TREE_TYPE (complex_double_type_node
) = double_type_node
;
6272 layout_type (complex_double_type_node
);
6274 complex_long_double_type_node
= make_node (COMPLEX_TYPE
);
6275 TREE_TYPE (complex_long_double_type_node
) = long_double_type_node
;
6276 layout_type (complex_long_double_type_node
);
6279 tree t
= targetm
.build_builtin_va_list ();
6281 /* Many back-ends define record types without setting TYPE_NAME.
6282 If we copied the record type here, we'd keep the original
6283 record type without a name. This breaks name mangling. So,
6284 don't copy record types and let c_common_nodes_and_builtins()
6285 declare the type to be __builtin_va_list. */
6286 if (TREE_CODE (t
) != RECORD_TYPE
)
6287 t
= build_variant_type_copy (t
);
6289 va_list_type_node
= t
;
6293 /* A subroutine of build_common_builtin_nodes. Define a builtin function. */
6296 local_define_builtin (const char *name
, tree type
, enum built_in_function code
,
6297 const char *library_name
, int ecf_flags
)
6301 decl
= lang_hooks
.builtin_function (name
, type
, code
, BUILT_IN_NORMAL
,
6302 library_name
, NULL_TREE
);
6303 if (ecf_flags
& ECF_CONST
)
6304 TREE_READONLY (decl
) = 1;
6305 if (ecf_flags
& ECF_PURE
)
6306 DECL_IS_PURE (decl
) = 1;
6307 if (ecf_flags
& ECF_NORETURN
)
6308 TREE_THIS_VOLATILE (decl
) = 1;
6309 if (ecf_flags
& ECF_NOTHROW
)
6310 TREE_NOTHROW (decl
) = 1;
6311 if (ecf_flags
& ECF_MALLOC
)
6312 DECL_IS_MALLOC (decl
) = 1;
6314 built_in_decls
[code
] = decl
;
6315 implicit_built_in_decls
[code
] = decl
;
6318 /* Call this function after instantiating all builtins that the language
6319 front end cares about. This will build the rest of the builtins that
6320 are relied upon by the tree optimizers and the middle-end. */
6323 build_common_builtin_nodes (void)
6327 if (built_in_decls
[BUILT_IN_MEMCPY
] == NULL
6328 || built_in_decls
[BUILT_IN_MEMMOVE
] == NULL
)
6330 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
6331 tmp
= tree_cons (NULL_TREE
, const_ptr_type_node
, tmp
);
6332 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
6333 ftype
= build_function_type (ptr_type_node
, tmp
);
6335 if (built_in_decls
[BUILT_IN_MEMCPY
] == NULL
)
6336 local_define_builtin ("__builtin_memcpy", ftype
, BUILT_IN_MEMCPY
,
6337 "memcpy", ECF_NOTHROW
);
6338 if (built_in_decls
[BUILT_IN_MEMMOVE
] == NULL
)
6339 local_define_builtin ("__builtin_memmove", ftype
, BUILT_IN_MEMMOVE
,
6340 "memmove", ECF_NOTHROW
);
6343 if (built_in_decls
[BUILT_IN_MEMCMP
] == NULL
)
6345 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
6346 tmp
= tree_cons (NULL_TREE
, const_ptr_type_node
, tmp
);
6347 tmp
= tree_cons (NULL_TREE
, const_ptr_type_node
, tmp
);
6348 ftype
= build_function_type (integer_type_node
, tmp
);
6349 local_define_builtin ("__builtin_memcmp", ftype
, BUILT_IN_MEMCMP
,
6350 "memcmp", ECF_PURE
| ECF_NOTHROW
);
6353 if (built_in_decls
[BUILT_IN_MEMSET
] == NULL
)
6355 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
6356 tmp
= tree_cons (NULL_TREE
, integer_type_node
, tmp
);
6357 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
6358 ftype
= build_function_type (ptr_type_node
, tmp
);
6359 local_define_builtin ("__builtin_memset", ftype
, BUILT_IN_MEMSET
,
6360 "memset", ECF_NOTHROW
);
6363 if (built_in_decls
[BUILT_IN_ALLOCA
] == NULL
)
6365 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
6366 ftype
= build_function_type (ptr_type_node
, tmp
);
6367 local_define_builtin ("__builtin_alloca", ftype
, BUILT_IN_ALLOCA
,
6368 "alloca", ECF_NOTHROW
| ECF_MALLOC
);
6371 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
6372 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
6373 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
6374 ftype
= build_function_type (void_type_node
, tmp
);
6375 local_define_builtin ("__builtin_init_trampoline", ftype
,
6376 BUILT_IN_INIT_TRAMPOLINE
,
6377 "__builtin_init_trampoline", ECF_NOTHROW
);
6379 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
6380 ftype
= build_function_type (ptr_type_node
, tmp
);
6381 local_define_builtin ("__builtin_adjust_trampoline", ftype
,
6382 BUILT_IN_ADJUST_TRAMPOLINE
,
6383 "__builtin_adjust_trampoline",
6384 ECF_CONST
| ECF_NOTHROW
);
6386 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
6387 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
6388 ftype
= build_function_type (void_type_node
, tmp
);
6389 local_define_builtin ("__builtin_nonlocal_goto", ftype
,
6390 BUILT_IN_NONLOCAL_GOTO
,
6391 "__builtin_nonlocal_goto",
6392 ECF_NORETURN
| ECF_NOTHROW
);
6394 ftype
= build_function_type (ptr_type_node
, void_list_node
);
6395 local_define_builtin ("__builtin_stack_save", ftype
, BUILT_IN_STACK_SAVE
,
6396 "__builtin_stack_save", ECF_NOTHROW
);
6398 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
6399 ftype
= build_function_type (void_type_node
, tmp
);
6400 local_define_builtin ("__builtin_stack_restore", ftype
,
6401 BUILT_IN_STACK_RESTORE
,
6402 "__builtin_stack_restore", ECF_NOTHROW
);
6404 ftype
= build_function_type (void_type_node
, void_list_node
);
6405 local_define_builtin ("__builtin_profile_func_enter", ftype
,
6406 BUILT_IN_PROFILE_FUNC_ENTER
, "profile_func_enter", 0);
6407 local_define_builtin ("__builtin_profile_func_exit", ftype
,
6408 BUILT_IN_PROFILE_FUNC_EXIT
, "profile_func_exit", 0);
6410 /* Complex multiplication and division. These are handled as builtins
6411 rather than optabs because emit_library_call_value doesn't support
6412 complex. Further, we can do slightly better with folding these
6413 beasties if the real and complex parts of the arguments are separate. */
6415 enum machine_mode mode
;
6417 for (mode
= MIN_MODE_COMPLEX_FLOAT
; mode
<= MAX_MODE_COMPLEX_FLOAT
; ++mode
)
6419 char mode_name_buf
[4], *q
;
6421 enum built_in_function mcode
, dcode
;
6422 tree type
, inner_type
;
6424 type
= lang_hooks
.types
.type_for_mode (mode
, 0);
6427 inner_type
= TREE_TYPE (type
);
6429 tmp
= tree_cons (NULL_TREE
, inner_type
, void_list_node
);
6430 tmp
= tree_cons (NULL_TREE
, inner_type
, tmp
);
6431 tmp
= tree_cons (NULL_TREE
, inner_type
, tmp
);
6432 tmp
= tree_cons (NULL_TREE
, inner_type
, tmp
);
6433 ftype
= build_function_type (type
, tmp
);
6435 mcode
= BUILT_IN_COMPLEX_MUL_MIN
+ mode
- MIN_MODE_COMPLEX_FLOAT
;
6436 dcode
= BUILT_IN_COMPLEX_DIV_MIN
+ mode
- MIN_MODE_COMPLEX_FLOAT
;
6438 for (p
= GET_MODE_NAME (mode
), q
= mode_name_buf
; *p
; p
++, q
++)
6442 built_in_names
[mcode
] = concat ("__mul", mode_name_buf
, "3", NULL
);
6443 local_define_builtin (built_in_names
[mcode
], ftype
, mcode
,
6444 built_in_names
[mcode
], ECF_CONST
| ECF_NOTHROW
);
6446 built_in_names
[dcode
] = concat ("__div", mode_name_buf
, "3", NULL
);
6447 local_define_builtin (built_in_names
[dcode
], ftype
, dcode
,
6448 built_in_names
[dcode
], ECF_CONST
| ECF_NOTHROW
);
6453 /* HACK. GROSS. This is absolutely disgusting. I wish there was a
6456 If we requested a pointer to a vector, build up the pointers that
6457 we stripped off while looking for the inner type. Similarly for
6458 return values from functions.
6460 The argument TYPE is the top of the chain, and BOTTOM is the
6461 new type which we will point to. */
6464 reconstruct_complex_type (tree type
, tree bottom
)
6468 if (POINTER_TYPE_P (type
))
6470 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
6471 outer
= build_pointer_type (inner
);
6473 else if (TREE_CODE (type
) == ARRAY_TYPE
)
6475 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
6476 outer
= build_array_type (inner
, TYPE_DOMAIN (type
));
6478 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6480 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
6481 outer
= build_function_type (inner
, TYPE_ARG_TYPES (type
));
6483 else if (TREE_CODE (type
) == METHOD_TYPE
)
6486 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
6487 /* The build_method_type_directly() routine prepends 'this' to argument list,
6488 so we must compensate by getting rid of it. */
6489 argtypes
= TYPE_ARG_TYPES (type
);
6490 outer
= build_method_type_directly (TYPE_METHOD_BASETYPE (type
),
6492 TYPE_ARG_TYPES (type
));
6493 TYPE_ARG_TYPES (outer
) = argtypes
;
6498 TYPE_READONLY (outer
) = TYPE_READONLY (type
);
6499 TYPE_VOLATILE (outer
) = TYPE_VOLATILE (type
);
6504 /* Returns a vector tree node given a mode (integer, vector, or BLKmode) and
6507 build_vector_type_for_mode (tree innertype
, enum machine_mode mode
)
6511 switch (GET_MODE_CLASS (mode
))
6513 case MODE_VECTOR_INT
:
6514 case MODE_VECTOR_FLOAT
:
6515 nunits
= GET_MODE_NUNITS (mode
);
6519 /* Check that there are no leftover bits. */
6520 gcc_assert (GET_MODE_BITSIZE (mode
)
6521 % TREE_INT_CST_LOW (TYPE_SIZE (innertype
)) == 0);
6523 nunits
= GET_MODE_BITSIZE (mode
)
6524 / TREE_INT_CST_LOW (TYPE_SIZE (innertype
));
6531 return make_vector_type (innertype
, nunits
, mode
);
6534 /* Similarly, but takes the inner type and number of units, which must be
6538 build_vector_type (tree innertype
, int nunits
)
6540 return make_vector_type (innertype
, nunits
, VOIDmode
);
6543 /* Build RESX_EXPR with given REGION_NUMBER. */
6545 build_resx (int region_number
)
6548 t
= build1 (RESX_EXPR
, void_type_node
,
6549 build_int_cst (NULL_TREE
, region_number
));
6553 /* Given an initializer INIT, return TRUE if INIT is zero or some
6554 aggregate of zeros. Otherwise return FALSE. */
6556 initializer_zerop (tree init
)
6562 switch (TREE_CODE (init
))
6565 return integer_zerop (init
);
6568 /* ??? Note that this is not correct for C4X float formats. There,
6569 a bit pattern of all zeros is 1.0; 0.0 is encoded with the most
6570 negative exponent. */
6571 return real_zerop (init
)
6572 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (init
));
6575 return integer_zerop (init
)
6576 || (real_zerop (init
)
6577 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_REALPART (init
)))
6578 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_IMAGPART (init
))));
6581 for (elt
= TREE_VECTOR_CST_ELTS (init
); elt
; elt
= TREE_CHAIN (elt
))
6582 if (!initializer_zerop (TREE_VALUE (elt
)))
6588 unsigned HOST_WIDE_INT idx
;
6590 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (init
), idx
, elt
)
6591 if (!initializer_zerop (elt
))
6602 add_var_to_bind_expr (tree bind_expr
, tree var
)
6604 BIND_EXPR_VARS (bind_expr
)
6605 = chainon (BIND_EXPR_VARS (bind_expr
), var
);
6606 if (BIND_EXPR_BLOCK (bind_expr
))
6607 BLOCK_VARS (BIND_EXPR_BLOCK (bind_expr
))
6608 = BIND_EXPR_VARS (bind_expr
);
6611 /* Build an empty statement. */
6614 build_empty_stmt (void)
6616 return build1 (NOP_EXPR
, void_type_node
, size_zero_node
);
6620 /* Returns true if it is possible to prove that the index of
6621 an array access REF (an ARRAY_REF expression) falls into the
6625 in_array_bounds_p (tree ref
)
6627 tree idx
= TREE_OPERAND (ref
, 1);
6630 if (TREE_CODE (idx
) != INTEGER_CST
)
6633 min
= array_ref_low_bound (ref
);
6634 max
= array_ref_up_bound (ref
);
6637 || TREE_CODE (min
) != INTEGER_CST
6638 || TREE_CODE (max
) != INTEGER_CST
)
6641 if (tree_int_cst_lt (idx
, min
)
6642 || tree_int_cst_lt (max
, idx
))
6648 /* Return true if T (assumed to be a DECL) is a global variable. */
6651 is_global_var (tree t
)
6654 return (TREE_STATIC (t
) || MTAG_GLOBAL (t
));
6656 return (TREE_STATIC (t
) || DECL_EXTERNAL (t
));
6659 /* Return true if T (assumed to be a DECL) must be assigned a memory
6663 needs_to_live_in_memory (tree t
)
6665 return (TREE_ADDRESSABLE (t
)
6666 || is_global_var (t
)
6667 || (TREE_CODE (t
) == RESULT_DECL
6668 && aggregate_value_p (t
, current_function_decl
)));
6671 /* There are situations in which a language considers record types
6672 compatible which have different field lists. Decide if two fields
6673 are compatible. It is assumed that the parent records are compatible. */
6676 fields_compatible_p (tree f1
, tree f2
)
6678 if (!operand_equal_p (DECL_FIELD_BIT_OFFSET (f1
),
6679 DECL_FIELD_BIT_OFFSET (f2
), OEP_ONLY_CONST
))
6682 if (!operand_equal_p (DECL_FIELD_OFFSET (f1
),
6683 DECL_FIELD_OFFSET (f2
), OEP_ONLY_CONST
))
6686 if (!lang_hooks
.types_compatible_p (TREE_TYPE (f1
), TREE_TYPE (f2
)))
6692 /* Locate within RECORD a field that is compatible with ORIG_FIELD. */
6695 find_compatible_field (tree record
, tree orig_field
)
6699 for (f
= TYPE_FIELDS (record
); f
; f
= TREE_CHAIN (f
))
6700 if (TREE_CODE (f
) == FIELD_DECL
6701 && fields_compatible_p (f
, orig_field
))
6704 /* ??? Why isn't this on the main fields list? */
6705 f
= TYPE_VFIELD (record
);
6706 if (f
&& TREE_CODE (f
) == FIELD_DECL
6707 && fields_compatible_p (f
, orig_field
))
6710 /* ??? We should abort here, but Java appears to do Bad Things
6711 with inherited fields. */
6715 /* Return value of a constant X. */
6718 int_cst_value (tree x
)
6720 unsigned bits
= TYPE_PRECISION (TREE_TYPE (x
));
6721 unsigned HOST_WIDE_INT val
= TREE_INT_CST_LOW (x
);
6722 bool negative
= ((val
>> (bits
- 1)) & 1) != 0;
6724 gcc_assert (bits
<= HOST_BITS_PER_WIDE_INT
);
6727 val
|= (~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1) << 1;
6729 val
&= ~((~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1) << 1);
6734 /* Returns the greatest common divisor of A and B, which must be
6738 tree_fold_gcd (tree a
, tree b
)
6741 tree type
= TREE_TYPE (a
);
6743 gcc_assert (TREE_CODE (a
) == INTEGER_CST
);
6744 gcc_assert (TREE_CODE (b
) == INTEGER_CST
);
6746 if (integer_zerop (a
))
6749 if (integer_zerop (b
))
6752 if (tree_int_cst_sgn (a
) == -1)
6753 a
= fold_build2 (MULT_EXPR
, type
, a
,
6754 convert (type
, integer_minus_one_node
));
6756 if (tree_int_cst_sgn (b
) == -1)
6757 b
= fold_build2 (MULT_EXPR
, type
, b
,
6758 convert (type
, integer_minus_one_node
));
6762 a_mod_b
= fold_build2 (FLOOR_MOD_EXPR
, type
, a
, b
);
6764 if (!TREE_INT_CST_LOW (a_mod_b
)
6765 && !TREE_INT_CST_HIGH (a_mod_b
))
6773 /* Returns unsigned variant of TYPE. */
6776 unsigned_type_for (tree type
)
6778 return lang_hooks
.types
.unsigned_type (type
);
6781 /* Returns signed variant of TYPE. */
6784 signed_type_for (tree type
)
6786 return lang_hooks
.types
.signed_type (type
);
6789 /* Returns the largest value obtainable by casting something in INNER type to
6793 upper_bound_in_type (tree outer
, tree inner
)
6795 unsigned HOST_WIDE_INT lo
, hi
;
6796 unsigned int det
= 0;
6797 unsigned oprec
= TYPE_PRECISION (outer
);
6798 unsigned iprec
= TYPE_PRECISION (inner
);
6801 /* Compute a unique number for every combination. */
6802 det
|= (oprec
> iprec
) ? 4 : 0;
6803 det
|= TYPE_UNSIGNED (outer
) ? 2 : 0;
6804 det
|= TYPE_UNSIGNED (inner
) ? 1 : 0;
6806 /* Determine the exponent to use. */
6811 /* oprec <= iprec, outer: signed, inner: don't care. */
6816 /* oprec <= iprec, outer: unsigned, inner: don't care. */
6820 /* oprec > iprec, outer: signed, inner: signed. */
6824 /* oprec > iprec, outer: signed, inner: unsigned. */
6828 /* oprec > iprec, outer: unsigned, inner: signed. */
6832 /* oprec > iprec, outer: unsigned, inner: unsigned. */
6839 /* Compute 2^^prec - 1. */
6840 if (prec
<= HOST_BITS_PER_WIDE_INT
)
6843 lo
= ((~(unsigned HOST_WIDE_INT
) 0)
6844 >> (HOST_BITS_PER_WIDE_INT
- prec
));
6848 hi
= ((~(unsigned HOST_WIDE_INT
) 0)
6849 >> (2 * HOST_BITS_PER_WIDE_INT
- prec
));
6850 lo
= ~(unsigned HOST_WIDE_INT
) 0;
6853 return build_int_cst_wide (outer
, lo
, hi
);
6856 /* Returns the smallest value obtainable by casting something in INNER type to
6860 lower_bound_in_type (tree outer
, tree inner
)
6862 unsigned HOST_WIDE_INT lo
, hi
;
6863 unsigned oprec
= TYPE_PRECISION (outer
);
6864 unsigned iprec
= TYPE_PRECISION (inner
);
6866 /* If OUTER type is unsigned, we can definitely cast 0 to OUTER type
6868 if (TYPE_UNSIGNED (outer
)
6869 /* If we are widening something of an unsigned type, OUTER type
6870 contains all values of INNER type. In particular, both INNER
6871 and OUTER types have zero in common. */
6872 || (oprec
> iprec
&& TYPE_UNSIGNED (inner
)))
6876 /* If we are widening a signed type to another signed type, we
6877 want to obtain -2^^(iprec-1). If we are keeping the
6878 precision or narrowing to a signed type, we want to obtain
6880 unsigned prec
= oprec
> iprec
? iprec
: oprec
;
6882 if (prec
<= HOST_BITS_PER_WIDE_INT
)
6884 hi
= ~(unsigned HOST_WIDE_INT
) 0;
6885 lo
= (~(unsigned HOST_WIDE_INT
) 0) << (prec
- 1);
6889 hi
= ((~(unsigned HOST_WIDE_INT
) 0)
6890 << (prec
- HOST_BITS_PER_WIDE_INT
- 1));
6895 return build_int_cst_wide (outer
, lo
, hi
);
6898 /* Return nonzero if two operands that are suitable for PHI nodes are
6899 necessarily equal. Specifically, both ARG0 and ARG1 must be either
6900 SSA_NAME or invariant. Note that this is strictly an optimization.
6901 That is, callers of this function can directly call operand_equal_p
6902 and get the same result, only slower. */
6905 operand_equal_for_phi_arg_p (tree arg0
, tree arg1
)
6909 if (TREE_CODE (arg0
) == SSA_NAME
|| TREE_CODE (arg1
) == SSA_NAME
)
6911 return operand_equal_p (arg0
, arg1
, 0);
6914 /* Returns number of zeros at the end of binary representation of X.
6916 ??? Use ffs if available? */
6919 num_ending_zeros (tree x
)
6921 unsigned HOST_WIDE_INT fr
, nfr
;
6922 unsigned num
, abits
;
6923 tree type
= TREE_TYPE (x
);
6925 if (TREE_INT_CST_LOW (x
) == 0)
6927 num
= HOST_BITS_PER_WIDE_INT
;
6928 fr
= TREE_INT_CST_HIGH (x
);
6933 fr
= TREE_INT_CST_LOW (x
);
6936 for (abits
= HOST_BITS_PER_WIDE_INT
/ 2; abits
; abits
/= 2)
6939 if (nfr
<< abits
== fr
)
6946 if (num
> TYPE_PRECISION (type
))
6947 num
= TYPE_PRECISION (type
);
6949 return build_int_cst_type (type
, num
);
6953 #define WALK_SUBTREE(NODE) \
6956 result = walk_tree (&(NODE), func, data, pset); \
6962 /* This is a subroutine of walk_tree that walks field of TYPE that are to
6963 be walked whenever a type is seen in the tree. Rest of operands and return
6964 value are as for walk_tree. */
6967 walk_type_fields (tree type
, walk_tree_fn func
, void *data
,
6968 struct pointer_set_t
*pset
)
6970 tree result
= NULL_TREE
;
6972 switch (TREE_CODE (type
))
6975 case REFERENCE_TYPE
:
6976 /* We have to worry about mutually recursive pointers. These can't
6977 be written in C. They can in Ada. It's pathological, but
6978 there's an ACATS test (c38102a) that checks it. Deal with this
6979 by checking if we're pointing to another pointer, that one
6980 points to another pointer, that one does too, and we have no htab.
6981 If so, get a hash table. We check three levels deep to avoid
6982 the cost of the hash table if we don't need one. */
6983 if (POINTER_TYPE_P (TREE_TYPE (type
))
6984 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (type
)))
6985 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (TREE_TYPE (type
))))
6988 result
= walk_tree_without_duplicates (&TREE_TYPE (type
),
6996 /* ... fall through ... */
6999 WALK_SUBTREE (TREE_TYPE (type
));
7003 WALK_SUBTREE (TYPE_METHOD_BASETYPE (type
));
7008 WALK_SUBTREE (TREE_TYPE (type
));
7012 /* We never want to walk into default arguments. */
7013 for (arg
= TYPE_ARG_TYPES (type
); arg
; arg
= TREE_CHAIN (arg
))
7014 WALK_SUBTREE (TREE_VALUE (arg
));
7019 /* Don't follow this nodes's type if a pointer for fear that we'll
7020 have infinite recursion. Those types are uninteresting anyway. */
7021 if (!POINTER_TYPE_P (TREE_TYPE (type
))
7022 && TREE_CODE (TREE_TYPE (type
)) != OFFSET_TYPE
)
7023 WALK_SUBTREE (TREE_TYPE (type
));
7024 WALK_SUBTREE (TYPE_DOMAIN (type
));
7032 WALK_SUBTREE (TYPE_MIN_VALUE (type
));
7033 WALK_SUBTREE (TYPE_MAX_VALUE (type
));
7037 WALK_SUBTREE (TREE_TYPE (type
));
7038 WALK_SUBTREE (TYPE_OFFSET_BASETYPE (type
));
7048 /* Apply FUNC to all the sub-trees of TP in a pre-order traversal. FUNC is
7049 called with the DATA and the address of each sub-tree. If FUNC returns a
7050 non-NULL value, the traversal is stopped, and the value returned by FUNC
7051 is returned. If PSET is non-NULL it is used to record the nodes visited,
7052 and to avoid visiting a node more than once. */
7055 walk_tree (tree
*tp
, walk_tree_fn func
, void *data
, struct pointer_set_t
*pset
)
7057 enum tree_code code
;
7061 #define WALK_SUBTREE_TAIL(NODE) \
7065 goto tail_recurse; \
7070 /* Skip empty subtrees. */
7074 /* Don't walk the same tree twice, if the user has requested
7075 that we avoid doing so. */
7076 if (pset
&& pointer_set_insert (pset
, *tp
))
7079 /* Call the function. */
7081 result
= (*func
) (tp
, &walk_subtrees
, data
);
7083 /* If we found something, return it. */
7087 code
= TREE_CODE (*tp
);
7089 /* Even if we didn't, FUNC may have decided that there was nothing
7090 interesting below this point in the tree. */
7093 if (code
== TREE_LIST
)
7094 /* But we still need to check our siblings. */
7095 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp
));
7100 result
= lang_hooks
.tree_inlining
.walk_subtrees (tp
, &walk_subtrees
, func
,
7102 if (result
|| ! walk_subtrees
)
7105 /* If this is a DECL_EXPR, walk into various fields of the type that it's
7106 defining. We only want to walk into these fields of a type in this
7107 case. Note that decls get walked as part of the processing of a
7110 ??? Precisely which fields of types that we are supposed to walk in
7111 this case vs. the normal case aren't well defined. */
7112 if (code
== DECL_EXPR
7113 && TREE_CODE (DECL_EXPR_DECL (*tp
)) == TYPE_DECL
7114 && TREE_CODE (TREE_TYPE (DECL_EXPR_DECL (*tp
))) != ERROR_MARK
)
7116 tree
*type_p
= &TREE_TYPE (DECL_EXPR_DECL (*tp
));
7118 /* Call the function for the type. See if it returns anything or
7119 doesn't want us to continue. If we are to continue, walk both
7120 the normal fields and those for the declaration case. */
7121 result
= (*func
) (type_p
, &walk_subtrees
, data
);
7122 if (result
|| !walk_subtrees
)
7125 result
= walk_type_fields (*type_p
, func
, data
, pset
);
7129 WALK_SUBTREE (TYPE_SIZE (*type_p
));
7130 WALK_SUBTREE (TYPE_SIZE_UNIT (*type_p
));
7132 /* If this is a record type, also walk the fields. */
7133 if (TREE_CODE (*type_p
) == RECORD_TYPE
7134 || TREE_CODE (*type_p
) == UNION_TYPE
7135 || TREE_CODE (*type_p
) == QUAL_UNION_TYPE
)
7139 for (field
= TYPE_FIELDS (*type_p
); field
;
7140 field
= TREE_CHAIN (field
))
7142 /* We'd like to look at the type of the field, but we can easily
7143 get infinite recursion. So assume it's pointed to elsewhere
7144 in the tree. Also, ignore things that aren't fields. */
7145 if (TREE_CODE (field
) != FIELD_DECL
)
7148 WALK_SUBTREE (DECL_FIELD_OFFSET (field
));
7149 WALK_SUBTREE (DECL_SIZE (field
));
7150 WALK_SUBTREE (DECL_SIZE_UNIT (field
));
7151 if (TREE_CODE (*type_p
) == QUAL_UNION_TYPE
)
7152 WALK_SUBTREE (DECL_QUALIFIER (field
));
7157 else if (code
!= SAVE_EXPR
7158 && code
!= BIND_EXPR
7159 && IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code
)))
7163 /* Walk over all the sub-trees of this operand. */
7164 len
= TREE_CODE_LENGTH (code
);
7165 /* TARGET_EXPRs are peculiar: operands 1 and 3 can be the same.
7166 But, we only want to walk once. */
7167 if (code
== TARGET_EXPR
7168 && TREE_OPERAND (*tp
, 3) == TREE_OPERAND (*tp
, 1))
7171 /* Go through the subtrees. We need to do this in forward order so
7172 that the scope of a FOR_EXPR is handled properly. */
7173 #ifdef DEBUG_WALK_TREE
7174 for (i
= 0; i
< len
; ++i
)
7175 WALK_SUBTREE (TREE_OPERAND (*tp
, i
));
7177 for (i
= 0; i
< len
- 1; ++i
)
7178 WALK_SUBTREE (TREE_OPERAND (*tp
, i
));
7182 /* The common case is that we may tail recurse here. */
7183 if (code
!= BIND_EXPR
7184 && !TREE_CHAIN (*tp
))
7185 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp
, len
- 1));
7187 WALK_SUBTREE (TREE_OPERAND (*tp
, len
- 1));
7192 /* If this is a type, walk the needed fields in the type. */
7193 else if (TYPE_P (*tp
))
7195 result
= walk_type_fields (*tp
, func
, data
, pset
);
7201 /* Not one of the easy cases. We must explicitly go through the
7206 case IDENTIFIER_NODE
:
7212 case PLACEHOLDER_EXPR
:
7216 /* None of these have subtrees other than those already walked
7221 WALK_SUBTREE (TREE_VALUE (*tp
));
7222 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp
));
7227 int len
= TREE_VEC_LENGTH (*tp
);
7232 /* Walk all elements but the first. */
7234 WALK_SUBTREE (TREE_VEC_ELT (*tp
, len
));
7236 /* Now walk the first one as a tail call. */
7237 WALK_SUBTREE_TAIL (TREE_VEC_ELT (*tp
, 0));
7241 WALK_SUBTREE (TREE_REALPART (*tp
));
7242 WALK_SUBTREE_TAIL (TREE_IMAGPART (*tp
));
7246 unsigned HOST_WIDE_INT idx
;
7247 constructor_elt
*ce
;
7250 VEC_iterate(constructor_elt
, CONSTRUCTOR_ELTS (*tp
), idx
, ce
);
7252 WALK_SUBTREE (ce
->value
);
7257 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp
, 0));
7262 for (decl
= BIND_EXPR_VARS (*tp
); decl
; decl
= TREE_CHAIN (decl
))
7264 /* Walk the DECL_INITIAL and DECL_SIZE. We don't want to walk
7265 into declarations that are just mentioned, rather than
7266 declared; they don't really belong to this part of the tree.
7267 And, we can see cycles: the initializer for a declaration
7268 can refer to the declaration itself. */
7269 WALK_SUBTREE (DECL_INITIAL (decl
));
7270 WALK_SUBTREE (DECL_SIZE (decl
));
7271 WALK_SUBTREE (DECL_SIZE_UNIT (decl
));
7273 WALK_SUBTREE_TAIL (BIND_EXPR_BODY (*tp
));
7276 case STATEMENT_LIST
:
7278 tree_stmt_iterator i
;
7279 for (i
= tsi_start (*tp
); !tsi_end_p (i
); tsi_next (&i
))
7280 WALK_SUBTREE (*tsi_stmt_ptr (i
));
7285 /* ??? This could be a language-defined node. We really should make
7286 a hook for it, but right now just ignore it. */
7291 /* We didn't find what we were looking for. */
7294 #undef WALK_SUBTREE_TAIL
7298 /* Like walk_tree, but does not walk duplicate nodes more than once. */
7301 walk_tree_without_duplicates (tree
*tp
, walk_tree_fn func
, void *data
)
7304 struct pointer_set_t
*pset
;
7306 pset
= pointer_set_create ();
7307 result
= walk_tree (tp
, func
, data
, pset
);
7308 pointer_set_destroy (pset
);
7312 #include "gt-tree.h"