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, 59 Temple Place - Suite 330, 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
[] = {
100 #endif /* GATHER_STATISTICS */
102 /* Unique id for next decl created. */
103 static GTY(()) int next_decl_uid
;
104 /* Unique id for next type created. */
105 static GTY(()) int next_type_uid
= 1;
107 /* Since we cannot rehash a type after it is in the table, we have to
108 keep the hash code. */
110 struct type_hash
GTY(())
116 /* Initial size of the hash table (rounded to next prime). */
117 #define TYPE_HASH_INITIAL_SIZE 1000
119 /* Now here is the hash table. When recording a type, it is added to
120 the slot whose index is the hash code. Note that the hash table is
121 used for several kinds of types (function types, array types and
122 array index range types, for now). While all these live in the
123 same table, they are completely independent, and the hash code is
124 computed differently for each of these. */
126 static GTY ((if_marked ("type_hash_marked_p"), param_is (struct type_hash
)))
127 htab_t type_hash_table
;
129 /* Hash table and temporary node for larger integer const values. */
130 static GTY (()) tree int_cst_node
;
131 static GTY ((if_marked ("ggc_marked_p"), param_is (union tree_node
)))
132 htab_t int_cst_hash_table
;
134 static void set_type_quals (tree
, int);
135 static int type_hash_eq (const void *, const void *);
136 static hashval_t
type_hash_hash (const void *);
137 static hashval_t
int_cst_hash_hash (const void *);
138 static int int_cst_hash_eq (const void *, const void *);
139 static void print_type_hash_statistics (void);
140 static tree
make_vector_type (tree
, int, enum machine_mode
);
141 static int type_hash_marked_p (const void *);
142 static unsigned int type_hash_list (tree
, hashval_t
);
143 static unsigned int attribute_hash_list (tree
, hashval_t
);
145 tree global_trees
[TI_MAX
];
146 tree integer_types
[itk_none
];
153 /* Initialize the hash table of types. */
154 type_hash_table
= htab_create_ggc (TYPE_HASH_INITIAL_SIZE
, type_hash_hash
,
156 int_cst_hash_table
= htab_create_ggc (1024, int_cst_hash_hash
,
157 int_cst_hash_eq
, NULL
);
158 int_cst_node
= make_node (INTEGER_CST
);
162 /* The name of the object as the assembler will see it (but before any
163 translations made by ASM_OUTPUT_LABELREF). Often this is the same
164 as DECL_NAME. It is an IDENTIFIER_NODE. */
166 decl_assembler_name (tree decl
)
168 if (!DECL_ASSEMBLER_NAME_SET_P (decl
))
169 lang_hooks
.set_decl_assembler_name (decl
);
170 return DECL_CHECK (decl
)->decl
.assembler_name
;
173 /* Compute the number of bytes occupied by a tree with code CODE.
174 This function cannot be used for TREE_VEC, PHI_NODE, or STRING_CST
175 codes, which are of variable length. */
177 tree_code_size (enum tree_code code
)
179 switch (TREE_CODE_CLASS (code
))
181 case tcc_declaration
: /* A decl node */
182 return sizeof (struct tree_decl
);
184 case tcc_type
: /* a type node */
185 return sizeof (struct tree_type
);
187 case tcc_reference
: /* a reference */
188 case tcc_expression
: /* an expression */
189 case tcc_statement
: /* an expression with side effects */
190 case tcc_comparison
: /* a comparison expression */
191 case tcc_unary
: /* a unary arithmetic expression */
192 case tcc_binary
: /* a binary arithmetic expression */
193 return (sizeof (struct tree_exp
)
194 + (TREE_CODE_LENGTH (code
) - 1) * sizeof (char *));
196 case tcc_constant
: /* a constant */
199 case INTEGER_CST
: return sizeof (struct tree_int_cst
);
200 case REAL_CST
: return sizeof (struct tree_real_cst
);
201 case COMPLEX_CST
: return sizeof (struct tree_complex
);
202 case VECTOR_CST
: return sizeof (struct tree_vector
);
203 case STRING_CST
: gcc_unreachable ();
205 return lang_hooks
.tree_size (code
);
208 case tcc_exceptional
: /* something random, like an identifier. */
211 case IDENTIFIER_NODE
: return lang_hooks
.identifier_size
;
212 case TREE_LIST
: return sizeof (struct tree_list
);
215 case PLACEHOLDER_EXPR
: return sizeof (struct tree_common
);
218 case PHI_NODE
: gcc_unreachable ();
220 case SSA_NAME
: return sizeof (struct tree_ssa_name
);
222 case STATEMENT_LIST
: return sizeof (struct tree_statement_list
);
223 case BLOCK
: return sizeof (struct tree_block
);
224 case VALUE_HANDLE
: return sizeof (struct tree_value_handle
);
227 return lang_hooks
.tree_size (code
);
235 /* Compute the number of bytes occupied by NODE. This routine only
236 looks at TREE_CODE, except for PHI_NODE and TREE_VEC nodes. */
238 tree_size (tree node
)
240 enum tree_code code
= TREE_CODE (node
);
244 return (sizeof (struct tree_phi_node
)
245 + (PHI_ARG_CAPACITY (node
) - 1) * sizeof (struct phi_arg_d
));
248 return (offsetof (struct tree_binfo
, base_binfos
)
249 + VEC_embedded_size (tree
, BINFO_N_BASE_BINFOS (node
)));
252 return (sizeof (struct tree_vec
)
253 + (TREE_VEC_LENGTH (node
) - 1) * sizeof(char *));
256 return sizeof (struct tree_string
) + TREE_STRING_LENGTH (node
) - 1;
259 return tree_code_size (code
);
263 /* Return a newly allocated node of code CODE. For decl and type
264 nodes, some other fields are initialized. The rest of the node is
265 initialized to zero. This function cannot be used for PHI_NODE or
266 TREE_VEC nodes, which is enforced by asserts in tree_code_size.
268 Achoo! I got a code in the node. */
271 make_node_stat (enum tree_code code MEM_STAT_DECL
)
274 enum tree_code_class type
= TREE_CODE_CLASS (code
);
275 size_t length
= tree_code_size (code
);
276 #ifdef GATHER_STATISTICS
281 case tcc_declaration
: /* A decl node */
285 case tcc_type
: /* a type node */
289 case tcc_statement
: /* an expression with side effects */
293 case tcc_reference
: /* a reference */
297 case tcc_expression
: /* an expression */
298 case tcc_comparison
: /* a comparison expression */
299 case tcc_unary
: /* a unary arithmetic expression */
300 case tcc_binary
: /* a binary arithmetic expression */
304 case tcc_constant
: /* a constant */
308 case tcc_exceptional
: /* something random, like an identifier. */
311 case IDENTIFIER_NODE
:
328 kind
= ssa_name_kind
;
345 tree_node_counts
[(int) kind
]++;
346 tree_node_sizes
[(int) kind
] += length
;
349 if (code
== IDENTIFIER_NODE
)
350 t
= ggc_alloc_zone_stat (length
, &tree_id_zone PASS_MEM_STAT
);
352 t
= ggc_alloc_zone_stat (length
, &tree_zone PASS_MEM_STAT
);
354 memset (t
, 0, length
);
356 TREE_SET_CODE (t
, code
);
361 TREE_SIDE_EFFECTS (t
) = 1;
364 case tcc_declaration
:
365 if (code
!= FUNCTION_DECL
)
367 DECL_USER_ALIGN (t
) = 0;
368 DECL_IN_SYSTEM_HEADER (t
) = in_system_header
;
369 DECL_SOURCE_LOCATION (t
) = input_location
;
370 DECL_UID (t
) = next_decl_uid
++;
372 /* We have not yet computed the alias set for this declaration. */
373 DECL_POINTER_ALIAS_SET (t
) = -1;
377 TYPE_UID (t
) = next_type_uid
++;
378 TYPE_ALIGN (t
) = char_type_node
? TYPE_ALIGN (char_type_node
) : 0;
379 TYPE_USER_ALIGN (t
) = 0;
380 TYPE_MAIN_VARIANT (t
) = t
;
382 /* Default to no attributes for type, but let target change that. */
383 TYPE_ATTRIBUTES (t
) = NULL_TREE
;
384 targetm
.set_default_type_attributes (t
);
386 /* We have not yet computed the alias set for this type. */
387 TYPE_ALIAS_SET (t
) = -1;
391 TREE_CONSTANT (t
) = 1;
392 TREE_INVARIANT (t
) = 1;
401 case PREDECREMENT_EXPR
:
402 case PREINCREMENT_EXPR
:
403 case POSTDECREMENT_EXPR
:
404 case POSTINCREMENT_EXPR
:
405 /* All of these have side-effects, no matter what their
407 TREE_SIDE_EFFECTS (t
) = 1;
416 /* Other classes need no special treatment. */
423 /* Return a new node with the same contents as NODE except that its
424 TREE_CHAIN is zero and it has a fresh uid. */
427 copy_node_stat (tree node MEM_STAT_DECL
)
430 enum tree_code code
= TREE_CODE (node
);
433 gcc_assert (code
!= STATEMENT_LIST
);
435 length
= tree_size (node
);
436 t
= ggc_alloc_zone_stat (length
, &tree_zone PASS_MEM_STAT
);
437 memcpy (t
, node
, length
);
440 TREE_ASM_WRITTEN (t
) = 0;
441 TREE_VISITED (t
) = 0;
444 if (TREE_CODE_CLASS (code
) == tcc_declaration
)
445 DECL_UID (t
) = next_decl_uid
++;
446 else if (TREE_CODE_CLASS (code
) == tcc_type
)
448 TYPE_UID (t
) = next_type_uid
++;
449 /* The following is so that the debug code for
450 the copy is different from the original type.
451 The two statements usually duplicate each other
452 (because they clear fields of the same union),
453 but the optimizer should catch that. */
454 TYPE_SYMTAB_POINTER (t
) = 0;
455 TYPE_SYMTAB_ADDRESS (t
) = 0;
457 /* Do not copy the values cache. */
458 if (TYPE_CACHED_VALUES_P(t
))
460 TYPE_CACHED_VALUES_P (t
) = 0;
461 TYPE_CACHED_VALUES (t
) = NULL_TREE
;
468 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
469 For example, this can copy a list made of TREE_LIST nodes. */
472 copy_list (tree list
)
480 head
= prev
= copy_node (list
);
481 next
= TREE_CHAIN (list
);
484 TREE_CHAIN (prev
) = copy_node (next
);
485 prev
= TREE_CHAIN (prev
);
486 next
= TREE_CHAIN (next
);
492 /* Create an INT_CST node with a LOW value sign extended. */
495 build_int_cst (tree type
, HOST_WIDE_INT low
)
497 return build_int_cst_wide (type
, low
, low
< 0 ? -1 : 0);
500 /* Create an INT_CST node with a LOW value zero extended. */
503 build_int_cstu (tree type
, unsigned HOST_WIDE_INT low
)
505 return build_int_cst_wide (type
, low
, 0);
508 /* Create an INT_CST node with a LOW value in TYPE. The value is sign extended
509 if it is negative. This function is similar to build_int_cst, but
510 the extra bits outside of the type precision are cleared. Constants
511 with these extra bits may confuse the fold so that it detects overflows
512 even in cases when they do not occur, and in general should be avoided.
513 We cannot however make this a default behavior of build_int_cst without
514 more intrusive changes, since there are parts of gcc that rely on the extra
515 precision of the integer constants. */
518 build_int_cst_type (tree type
, HOST_WIDE_INT low
)
520 unsigned HOST_WIDE_INT val
= (unsigned HOST_WIDE_INT
) low
;
521 unsigned HOST_WIDE_INT hi
;
527 type
= integer_type_node
;
529 bits
= TYPE_PRECISION (type
);
530 signed_p
= !TYPE_UNSIGNED (type
);
532 if (bits
>= HOST_BITS_PER_WIDE_INT
)
533 negative
= (low
< 0);
536 /* If the sign bit is inside precision of LOW, use it to determine
537 the sign of the constant. */
538 negative
= ((val
>> (bits
- 1)) & 1) != 0;
540 /* Mask out the bits outside of the precision of the constant. */
541 if (signed_p
&& negative
)
542 val
= val
| ((~(unsigned HOST_WIDE_INT
) 0) << bits
);
544 val
= val
& ~((~(unsigned HOST_WIDE_INT
) 0) << bits
);
547 /* Determine the high bits. */
548 hi
= (negative
? ~(unsigned HOST_WIDE_INT
) 0 : 0);
550 /* For unsigned type we need to mask out the bits outside of the type
554 if (bits
<= HOST_BITS_PER_WIDE_INT
)
558 bits
-= HOST_BITS_PER_WIDE_INT
;
559 hi
= hi
& ~((~(unsigned HOST_WIDE_INT
) 0) << bits
);
563 return build_int_cst_wide (type
, val
, hi
);
566 /* These are the hash table functions for the hash table of INTEGER_CST
567 nodes of a sizetype. */
569 /* Return the hash code code X, an INTEGER_CST. */
572 int_cst_hash_hash (const void *x
)
576 return (TREE_INT_CST_HIGH (t
) ^ TREE_INT_CST_LOW (t
)
577 ^ htab_hash_pointer (TREE_TYPE (t
)));
580 /* Return nonzero if the value represented by *X (an INTEGER_CST tree node)
581 is the same as that given by *Y, which is the same. */
584 int_cst_hash_eq (const void *x
, const void *y
)
589 return (TREE_TYPE (xt
) == TREE_TYPE (yt
)
590 && TREE_INT_CST_HIGH (xt
) == TREE_INT_CST_HIGH (yt
)
591 && TREE_INT_CST_LOW (xt
) == TREE_INT_CST_LOW (yt
));
594 /* Create an INT_CST node of TYPE and value HI:LOW. If TYPE is NULL,
595 integer_type_node is used. The returned node is always shared.
596 For small integers we use a per-type vector cache, for larger ones
597 we use a single hash table. */
600 build_int_cst_wide (tree type
, unsigned HOST_WIDE_INT low
, HOST_WIDE_INT hi
)
607 type
= integer_type_node
;
609 switch (TREE_CODE (type
))
613 /* Cache NULL pointer. */
622 /* Cache false or true. */
631 if (TYPE_UNSIGNED (type
))
634 limit
= INTEGER_SHARE_LIMIT
;
635 if (!hi
&& low
< (unsigned HOST_WIDE_INT
)INTEGER_SHARE_LIMIT
)
641 limit
= INTEGER_SHARE_LIMIT
+ 1;
642 if (!hi
&& low
< (unsigned HOST_WIDE_INT
)INTEGER_SHARE_LIMIT
)
644 else if (hi
== -1 && low
== -(unsigned HOST_WIDE_INT
)1)
654 /* Look for it in the type's vector of small shared ints. */
655 if (!TYPE_CACHED_VALUES_P (type
))
657 TYPE_CACHED_VALUES_P (type
) = 1;
658 TYPE_CACHED_VALUES (type
) = make_tree_vec (limit
);
661 t
= TREE_VEC_ELT (TYPE_CACHED_VALUES (type
), ix
);
664 /* Make sure no one is clobbering the shared constant. */
665 gcc_assert (TREE_TYPE (t
) == type
);
666 gcc_assert (TREE_INT_CST_LOW (t
) == low
);
667 gcc_assert (TREE_INT_CST_HIGH (t
) == hi
);
671 /* Create a new shared int. */
672 t
= make_node (INTEGER_CST
);
674 TREE_INT_CST_LOW (t
) = low
;
675 TREE_INT_CST_HIGH (t
) = hi
;
676 TREE_TYPE (t
) = type
;
678 TREE_VEC_ELT (TYPE_CACHED_VALUES (type
), ix
) = t
;
683 /* Use the cache of larger shared ints. */
686 TREE_INT_CST_LOW (int_cst_node
) = low
;
687 TREE_INT_CST_HIGH (int_cst_node
) = hi
;
688 TREE_TYPE (int_cst_node
) = type
;
690 slot
= htab_find_slot (int_cst_hash_table
, int_cst_node
, INSERT
);
694 /* Insert this one into the hash table. */
697 /* Make a new node for next time round. */
698 int_cst_node
= make_node (INTEGER_CST
);
705 /* Builds an integer constant in TYPE such that lowest BITS bits are ones
706 and the rest are zeros. */
709 build_low_bits_mask (tree type
, unsigned bits
)
711 unsigned HOST_WIDE_INT low
;
713 unsigned HOST_WIDE_INT all_ones
= ~(unsigned HOST_WIDE_INT
) 0;
715 gcc_assert (bits
<= TYPE_PRECISION (type
));
717 if (bits
== TYPE_PRECISION (type
)
718 && !TYPE_UNSIGNED (type
))
720 /* Sign extended all-ones mask. */
724 else if (bits
<= HOST_BITS_PER_WIDE_INT
)
726 low
= all_ones
>> (HOST_BITS_PER_WIDE_INT
- bits
);
731 bits
-= HOST_BITS_PER_WIDE_INT
;
733 high
= all_ones
>> (HOST_BITS_PER_WIDE_INT
- bits
);
736 return build_int_cst_wide (type
, low
, high
);
739 /* Checks that X is integer constant that can be expressed in (unsigned)
740 HOST_WIDE_INT without loss of precision. */
743 cst_and_fits_in_hwi (tree x
)
745 if (TREE_CODE (x
) != INTEGER_CST
)
748 if (TYPE_PRECISION (TREE_TYPE (x
)) > HOST_BITS_PER_WIDE_INT
)
751 return (TREE_INT_CST_HIGH (x
) == 0
752 || TREE_INT_CST_HIGH (x
) == -1);
755 /* Return a new VECTOR_CST node whose type is TYPE and whose values
756 are in a list pointed by VALS. */
759 build_vector (tree type
, tree vals
)
761 tree v
= make_node (VECTOR_CST
);
762 int over1
= 0, over2
= 0;
765 TREE_VECTOR_CST_ELTS (v
) = vals
;
766 TREE_TYPE (v
) = type
;
768 /* Iterate through elements and check for overflow. */
769 for (link
= vals
; link
; link
= TREE_CHAIN (link
))
771 tree value
= TREE_VALUE (link
);
773 over1
|= TREE_OVERFLOW (value
);
774 over2
|= TREE_CONSTANT_OVERFLOW (value
);
777 TREE_OVERFLOW (v
) = over1
;
778 TREE_CONSTANT_OVERFLOW (v
) = over2
;
783 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
784 are in a list pointed to by VALS. */
786 build_constructor (tree type
, tree vals
)
788 tree c
= make_node (CONSTRUCTOR
);
789 TREE_TYPE (c
) = type
;
790 CONSTRUCTOR_ELTS (c
) = vals
;
792 /* ??? May not be necessary. Mirrors what build does. */
795 TREE_SIDE_EFFECTS (c
) = TREE_SIDE_EFFECTS (vals
);
796 TREE_READONLY (c
) = TREE_READONLY (vals
);
797 TREE_CONSTANT (c
) = TREE_CONSTANT (vals
);
798 TREE_INVARIANT (c
) = TREE_INVARIANT (vals
);
804 /* Return a new REAL_CST node whose type is TYPE and value is D. */
807 build_real (tree type
, REAL_VALUE_TYPE d
)
813 /* ??? Used to check for overflow here via CHECK_FLOAT_TYPE.
814 Consider doing it via real_convert now. */
816 v
= make_node (REAL_CST
);
817 dp
= ggc_alloc (sizeof (REAL_VALUE_TYPE
));
818 memcpy (dp
, &d
, sizeof (REAL_VALUE_TYPE
));
820 TREE_TYPE (v
) = type
;
821 TREE_REAL_CST_PTR (v
) = dp
;
822 TREE_OVERFLOW (v
) = TREE_CONSTANT_OVERFLOW (v
) = overflow
;
826 /* Return a new REAL_CST node whose type is TYPE
827 and whose value is the integer value of the INTEGER_CST node I. */
830 real_value_from_int_cst (tree type
, tree i
)
834 /* Clear all bits of the real value type so that we can later do
835 bitwise comparisons to see if two values are the same. */
836 memset (&d
, 0, sizeof d
);
838 real_from_integer (&d
, type
? TYPE_MODE (type
) : VOIDmode
,
839 TREE_INT_CST_LOW (i
), TREE_INT_CST_HIGH (i
),
840 TYPE_UNSIGNED (TREE_TYPE (i
)));
844 /* Given a tree representing an integer constant I, return a tree
845 representing the same value as a floating-point constant of type TYPE. */
848 build_real_from_int_cst (tree type
, tree i
)
851 int overflow
= TREE_OVERFLOW (i
);
853 v
= build_real (type
, real_value_from_int_cst (type
, i
));
855 TREE_OVERFLOW (v
) |= overflow
;
856 TREE_CONSTANT_OVERFLOW (v
) |= overflow
;
860 /* Return a newly constructed STRING_CST node whose value is
861 the LEN characters at STR.
862 The TREE_TYPE is not initialized. */
865 build_string (int len
, const char *str
)
870 length
= len
+ sizeof (struct tree_string
);
872 #ifdef GATHER_STATISTICS
873 tree_node_counts
[(int) c_kind
]++;
874 tree_node_sizes
[(int) c_kind
] += length
;
877 s
= ggc_alloc_tree (length
);
879 memset (s
, 0, sizeof (struct tree_common
));
880 TREE_SET_CODE (s
, STRING_CST
);
881 TREE_STRING_LENGTH (s
) = len
;
882 memcpy ((char *) TREE_STRING_POINTER (s
), str
, len
);
883 ((char *) TREE_STRING_POINTER (s
))[len
] = '\0';
888 /* Return a newly constructed COMPLEX_CST node whose value is
889 specified by the real and imaginary parts REAL and IMAG.
890 Both REAL and IMAG should be constant nodes. TYPE, if specified,
891 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
894 build_complex (tree type
, tree real
, tree imag
)
896 tree t
= make_node (COMPLEX_CST
);
898 TREE_REALPART (t
) = real
;
899 TREE_IMAGPART (t
) = imag
;
900 TREE_TYPE (t
) = type
? type
: build_complex_type (TREE_TYPE (real
));
901 TREE_OVERFLOW (t
) = TREE_OVERFLOW (real
) | TREE_OVERFLOW (imag
);
902 TREE_CONSTANT_OVERFLOW (t
)
903 = TREE_CONSTANT_OVERFLOW (real
) | TREE_CONSTANT_OVERFLOW (imag
);
907 /* Build a BINFO with LEN language slots. */
910 make_tree_binfo_stat (unsigned base_binfos MEM_STAT_DECL
)
913 size_t length
= (offsetof (struct tree_binfo
, base_binfos
)
914 + VEC_embedded_size (tree
, base_binfos
));
916 #ifdef GATHER_STATISTICS
917 tree_node_counts
[(int) binfo_kind
]++;
918 tree_node_sizes
[(int) binfo_kind
] += length
;
921 t
= ggc_alloc_zone_stat (length
, &tree_zone PASS_MEM_STAT
);
923 memset (t
, 0, offsetof (struct tree_binfo
, base_binfos
));
925 TREE_SET_CODE (t
, TREE_BINFO
);
927 VEC_embedded_init (tree
, BINFO_BASE_BINFOS (t
), base_binfos
);
933 /* Build a newly constructed TREE_VEC node of length LEN. */
936 make_tree_vec_stat (int len MEM_STAT_DECL
)
939 int length
= (len
- 1) * sizeof (tree
) + sizeof (struct tree_vec
);
941 #ifdef GATHER_STATISTICS
942 tree_node_counts
[(int) vec_kind
]++;
943 tree_node_sizes
[(int) vec_kind
] += length
;
946 t
= ggc_alloc_zone_stat (length
, &tree_zone PASS_MEM_STAT
);
948 memset (t
, 0, length
);
950 TREE_SET_CODE (t
, TREE_VEC
);
951 TREE_VEC_LENGTH (t
) = len
;
956 /* Return 1 if EXPR is the integer constant zero or a complex constant
960 integer_zerop (tree expr
)
964 return ((TREE_CODE (expr
) == INTEGER_CST
965 && ! TREE_CONSTANT_OVERFLOW (expr
)
966 && TREE_INT_CST_LOW (expr
) == 0
967 && TREE_INT_CST_HIGH (expr
) == 0)
968 || (TREE_CODE (expr
) == COMPLEX_CST
969 && integer_zerop (TREE_REALPART (expr
))
970 && integer_zerop (TREE_IMAGPART (expr
))));
973 /* Return 1 if EXPR is the integer constant one or the corresponding
977 integer_onep (tree expr
)
981 return ((TREE_CODE (expr
) == INTEGER_CST
982 && ! TREE_CONSTANT_OVERFLOW (expr
)
983 && TREE_INT_CST_LOW (expr
) == 1
984 && TREE_INT_CST_HIGH (expr
) == 0)
985 || (TREE_CODE (expr
) == COMPLEX_CST
986 && integer_onep (TREE_REALPART (expr
))
987 && integer_zerop (TREE_IMAGPART (expr
))));
990 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
991 it contains. Likewise for the corresponding complex constant. */
994 integer_all_onesp (tree expr
)
1001 if (TREE_CODE (expr
) == COMPLEX_CST
1002 && integer_all_onesp (TREE_REALPART (expr
))
1003 && integer_zerop (TREE_IMAGPART (expr
)))
1006 else if (TREE_CODE (expr
) != INTEGER_CST
1007 || TREE_CONSTANT_OVERFLOW (expr
))
1010 uns
= TYPE_UNSIGNED (TREE_TYPE (expr
));
1012 return (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
1013 && TREE_INT_CST_HIGH (expr
) == -1);
1015 /* Note that using TYPE_PRECISION here is wrong. We care about the
1016 actual bits, not the (arbitrary) range of the type. */
1017 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr
)));
1018 if (prec
>= HOST_BITS_PER_WIDE_INT
)
1020 HOST_WIDE_INT high_value
;
1023 shift_amount
= prec
- HOST_BITS_PER_WIDE_INT
;
1025 /* Can not handle precisions greater than twice the host int size. */
1026 gcc_assert (shift_amount
<= HOST_BITS_PER_WIDE_INT
);
1027 if (shift_amount
== HOST_BITS_PER_WIDE_INT
)
1028 /* Shifting by the host word size is undefined according to the ANSI
1029 standard, so we must handle this as a special case. */
1032 high_value
= ((HOST_WIDE_INT
) 1 << shift_amount
) - 1;
1034 return (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
1035 && TREE_INT_CST_HIGH (expr
) == high_value
);
1038 return TREE_INT_CST_LOW (expr
) == ((unsigned HOST_WIDE_INT
) 1 << prec
) - 1;
1041 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
1045 integer_pow2p (tree expr
)
1048 HOST_WIDE_INT high
, low
;
1052 if (TREE_CODE (expr
) == COMPLEX_CST
1053 && integer_pow2p (TREE_REALPART (expr
))
1054 && integer_zerop (TREE_IMAGPART (expr
)))
1057 if (TREE_CODE (expr
) != INTEGER_CST
|| TREE_CONSTANT_OVERFLOW (expr
))
1060 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
1061 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
1062 high
= TREE_INT_CST_HIGH (expr
);
1063 low
= TREE_INT_CST_LOW (expr
);
1065 /* First clear all bits that are beyond the type's precision in case
1066 we've been sign extended. */
1068 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
1070 else if (prec
> HOST_BITS_PER_WIDE_INT
)
1071 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
1075 if (prec
< HOST_BITS_PER_WIDE_INT
)
1076 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
1079 if (high
== 0 && low
== 0)
1082 return ((high
== 0 && (low
& (low
- 1)) == 0)
1083 || (low
== 0 && (high
& (high
- 1)) == 0));
1086 /* Return 1 if EXPR is an integer constant other than zero or a
1087 complex constant other than zero. */
1090 integer_nonzerop (tree expr
)
1094 return ((TREE_CODE (expr
) == INTEGER_CST
1095 && ! TREE_CONSTANT_OVERFLOW (expr
)
1096 && (TREE_INT_CST_LOW (expr
) != 0
1097 || TREE_INT_CST_HIGH (expr
) != 0))
1098 || (TREE_CODE (expr
) == COMPLEX_CST
1099 && (integer_nonzerop (TREE_REALPART (expr
))
1100 || integer_nonzerop (TREE_IMAGPART (expr
)))));
1103 /* Return the power of two represented by a tree node known to be a
1107 tree_log2 (tree expr
)
1110 HOST_WIDE_INT high
, low
;
1114 if (TREE_CODE (expr
) == COMPLEX_CST
)
1115 return tree_log2 (TREE_REALPART (expr
));
1117 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
1118 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
1120 high
= TREE_INT_CST_HIGH (expr
);
1121 low
= TREE_INT_CST_LOW (expr
);
1123 /* First clear all bits that are beyond the type's precision in case
1124 we've been sign extended. */
1126 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
1128 else if (prec
> HOST_BITS_PER_WIDE_INT
)
1129 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
1133 if (prec
< HOST_BITS_PER_WIDE_INT
)
1134 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
1137 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ exact_log2 (high
)
1138 : exact_log2 (low
));
1141 /* Similar, but return the largest integer Y such that 2 ** Y is less
1142 than or equal to EXPR. */
1145 tree_floor_log2 (tree expr
)
1148 HOST_WIDE_INT high
, low
;
1152 if (TREE_CODE (expr
) == COMPLEX_CST
)
1153 return tree_log2 (TREE_REALPART (expr
));
1155 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
1156 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
1158 high
= TREE_INT_CST_HIGH (expr
);
1159 low
= TREE_INT_CST_LOW (expr
);
1161 /* First clear all bits that are beyond the type's precision in case
1162 we've been sign extended. Ignore if type's precision hasn't been set
1163 since what we are doing is setting it. */
1165 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
|| prec
== 0)
1167 else if (prec
> HOST_BITS_PER_WIDE_INT
)
1168 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
1172 if (prec
< HOST_BITS_PER_WIDE_INT
)
1173 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
1176 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ floor_log2 (high
)
1177 : floor_log2 (low
));
1180 /* Return 1 if EXPR is the real constant zero. */
1183 real_zerop (tree expr
)
1187 return ((TREE_CODE (expr
) == REAL_CST
1188 && ! TREE_CONSTANT_OVERFLOW (expr
)
1189 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst0
))
1190 || (TREE_CODE (expr
) == COMPLEX_CST
1191 && real_zerop (TREE_REALPART (expr
))
1192 && real_zerop (TREE_IMAGPART (expr
))));
1195 /* Return 1 if EXPR is the real constant one in real or complex form. */
1198 real_onep (tree expr
)
1202 return ((TREE_CODE (expr
) == REAL_CST
1203 && ! TREE_CONSTANT_OVERFLOW (expr
)
1204 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst1
))
1205 || (TREE_CODE (expr
) == COMPLEX_CST
1206 && real_onep (TREE_REALPART (expr
))
1207 && real_zerop (TREE_IMAGPART (expr
))));
1210 /* Return 1 if EXPR is the real constant two. */
1213 real_twop (tree expr
)
1217 return ((TREE_CODE (expr
) == REAL_CST
1218 && ! TREE_CONSTANT_OVERFLOW (expr
)
1219 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst2
))
1220 || (TREE_CODE (expr
) == COMPLEX_CST
1221 && real_twop (TREE_REALPART (expr
))
1222 && real_zerop (TREE_IMAGPART (expr
))));
1225 /* Return 1 if EXPR is the real constant minus one. */
1228 real_minus_onep (tree expr
)
1232 return ((TREE_CODE (expr
) == REAL_CST
1233 && ! TREE_CONSTANT_OVERFLOW (expr
)
1234 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconstm1
))
1235 || (TREE_CODE (expr
) == COMPLEX_CST
1236 && real_minus_onep (TREE_REALPART (expr
))
1237 && real_zerop (TREE_IMAGPART (expr
))));
1240 /* Nonzero if EXP is a constant or a cast of a constant. */
1243 really_constant_p (tree exp
)
1245 /* This is not quite the same as STRIP_NOPS. It does more. */
1246 while (TREE_CODE (exp
) == NOP_EXPR
1247 || TREE_CODE (exp
) == CONVERT_EXPR
1248 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
1249 exp
= TREE_OPERAND (exp
, 0);
1250 return TREE_CONSTANT (exp
);
1253 /* Return first list element whose TREE_VALUE is ELEM.
1254 Return 0 if ELEM is not in LIST. */
1257 value_member (tree elem
, tree list
)
1261 if (elem
== TREE_VALUE (list
))
1263 list
= TREE_CHAIN (list
);
1268 /* Return first list element whose TREE_PURPOSE is ELEM.
1269 Return 0 if ELEM is not in LIST. */
1272 purpose_member (tree elem
, tree list
)
1276 if (elem
== TREE_PURPOSE (list
))
1278 list
= TREE_CHAIN (list
);
1283 /* Return nonzero if ELEM is part of the chain CHAIN. */
1286 chain_member (tree elem
, tree chain
)
1292 chain
= TREE_CHAIN (chain
);
1298 /* Return the length of a chain of nodes chained through TREE_CHAIN.
1299 We expect a null pointer to mark the end of the chain.
1300 This is the Lisp primitive `length'. */
1303 list_length (tree t
)
1306 #ifdef ENABLE_TREE_CHECKING
1314 #ifdef ENABLE_TREE_CHECKING
1317 gcc_assert (p
!= q
);
1325 /* Returns the number of FIELD_DECLs in TYPE. */
1328 fields_length (tree type
)
1330 tree t
= TYPE_FIELDS (type
);
1333 for (; t
; t
= TREE_CHAIN (t
))
1334 if (TREE_CODE (t
) == FIELD_DECL
)
1340 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
1341 by modifying the last node in chain 1 to point to chain 2.
1342 This is the Lisp primitive `nconc'. */
1345 chainon (tree op1
, tree op2
)
1354 for (t1
= op1
; TREE_CHAIN (t1
); t1
= TREE_CHAIN (t1
))
1356 TREE_CHAIN (t1
) = op2
;
1358 #ifdef ENABLE_TREE_CHECKING
1361 for (t2
= op2
; t2
; t2
= TREE_CHAIN (t2
))
1362 gcc_assert (t2
!= t1
);
1369 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
1372 tree_last (tree chain
)
1376 while ((next
= TREE_CHAIN (chain
)))
1381 /* Reverse the order of elements in the chain T,
1382 and return the new head of the chain (old last element). */
1387 tree prev
= 0, decl
, next
;
1388 for (decl
= t
; decl
; decl
= next
)
1390 next
= TREE_CHAIN (decl
);
1391 TREE_CHAIN (decl
) = prev
;
1397 /* Return a newly created TREE_LIST node whose
1398 purpose and value fields are PARM and VALUE. */
1401 build_tree_list_stat (tree parm
, tree value MEM_STAT_DECL
)
1403 tree t
= make_node_stat (TREE_LIST PASS_MEM_STAT
);
1404 TREE_PURPOSE (t
) = parm
;
1405 TREE_VALUE (t
) = value
;
1409 /* Return a newly created TREE_LIST node whose
1410 purpose and value fields are PURPOSE and VALUE
1411 and whose TREE_CHAIN is CHAIN. */
1414 tree_cons_stat (tree purpose
, tree value
, tree chain MEM_STAT_DECL
)
1418 node
= ggc_alloc_zone_stat (sizeof (struct tree_list
),
1419 &tree_zone PASS_MEM_STAT
);
1421 memset (node
, 0, sizeof (struct tree_common
));
1423 #ifdef GATHER_STATISTICS
1424 tree_node_counts
[(int) x_kind
]++;
1425 tree_node_sizes
[(int) x_kind
] += sizeof (struct tree_list
);
1428 TREE_SET_CODE (node
, TREE_LIST
);
1429 TREE_CHAIN (node
) = chain
;
1430 TREE_PURPOSE (node
) = purpose
;
1431 TREE_VALUE (node
) = value
;
1436 /* Return the size nominally occupied by an object of type TYPE
1437 when it resides in memory. The value is measured in units of bytes,
1438 and its data type is that normally used for type sizes
1439 (which is the first type created by make_signed_type or
1440 make_unsigned_type). */
1443 size_in_bytes (tree type
)
1447 if (type
== error_mark_node
)
1448 return integer_zero_node
;
1450 type
= TYPE_MAIN_VARIANT (type
);
1451 t
= TYPE_SIZE_UNIT (type
);
1455 lang_hooks
.types
.incomplete_type_error (NULL_TREE
, type
);
1456 return size_zero_node
;
1459 if (TREE_CODE (t
) == INTEGER_CST
)
1460 t
= force_fit_type (t
, 0, false, false);
1465 /* Return the size of TYPE (in bytes) as a wide integer
1466 or return -1 if the size can vary or is larger than an integer. */
1469 int_size_in_bytes (tree type
)
1473 if (type
== error_mark_node
)
1476 type
= TYPE_MAIN_VARIANT (type
);
1477 t
= TYPE_SIZE_UNIT (type
);
1479 || TREE_CODE (t
) != INTEGER_CST
1480 || TREE_OVERFLOW (t
)
1481 || TREE_INT_CST_HIGH (t
) != 0
1482 /* If the result would appear negative, it's too big to represent. */
1483 || (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0)
1486 return TREE_INT_CST_LOW (t
);
1489 /* Return the bit position of FIELD, in bits from the start of the record.
1490 This is a tree of type bitsizetype. */
1493 bit_position (tree field
)
1495 return bit_from_pos (DECL_FIELD_OFFSET (field
),
1496 DECL_FIELD_BIT_OFFSET (field
));
1499 /* Likewise, but return as an integer. Abort if it cannot be represented
1500 in that way (since it could be a signed value, we don't have the option
1501 of returning -1 like int_size_in_byte can. */
1504 int_bit_position (tree field
)
1506 return tree_low_cst (bit_position (field
), 0);
1509 /* Return the byte position of FIELD, in bytes from the start of the record.
1510 This is a tree of type sizetype. */
1513 byte_position (tree field
)
1515 return byte_from_pos (DECL_FIELD_OFFSET (field
),
1516 DECL_FIELD_BIT_OFFSET (field
));
1519 /* Likewise, but return as an integer. Abort if it cannot be represented
1520 in that way (since it could be a signed value, we don't have the option
1521 of returning -1 like int_size_in_byte can. */
1524 int_byte_position (tree field
)
1526 return tree_low_cst (byte_position (field
), 0);
1529 /* Return the strictest alignment, in bits, that T is known to have. */
1534 unsigned int align0
, align1
;
1536 switch (TREE_CODE (t
))
1538 case NOP_EXPR
: case CONVERT_EXPR
: case NON_LVALUE_EXPR
:
1539 /* If we have conversions, we know that the alignment of the
1540 object must meet each of the alignments of the types. */
1541 align0
= expr_align (TREE_OPERAND (t
, 0));
1542 align1
= TYPE_ALIGN (TREE_TYPE (t
));
1543 return MAX (align0
, align1
);
1545 case SAVE_EXPR
: case COMPOUND_EXPR
: case MODIFY_EXPR
:
1546 case INIT_EXPR
: case TARGET_EXPR
: case WITH_CLEANUP_EXPR
:
1547 case CLEANUP_POINT_EXPR
:
1548 /* These don't change the alignment of an object. */
1549 return expr_align (TREE_OPERAND (t
, 0));
1552 /* The best we can do is say that the alignment is the least aligned
1554 align0
= expr_align (TREE_OPERAND (t
, 1));
1555 align1
= expr_align (TREE_OPERAND (t
, 2));
1556 return MIN (align0
, align1
);
1558 case LABEL_DECL
: case CONST_DECL
:
1559 case VAR_DECL
: case PARM_DECL
: case RESULT_DECL
:
1560 if (DECL_ALIGN (t
) != 0)
1561 return DECL_ALIGN (t
);
1565 return FUNCTION_BOUNDARY
;
1571 /* Otherwise take the alignment from that of the type. */
1572 return TYPE_ALIGN (TREE_TYPE (t
));
1575 /* Return, as a tree node, the number of elements for TYPE (which is an
1576 ARRAY_TYPE) minus one. This counts only elements of the top array. */
1579 array_type_nelts (tree type
)
1581 tree index_type
, min
, max
;
1583 /* If they did it with unspecified bounds, then we should have already
1584 given an error about it before we got here. */
1585 if (! TYPE_DOMAIN (type
))
1586 return error_mark_node
;
1588 index_type
= TYPE_DOMAIN (type
);
1589 min
= TYPE_MIN_VALUE (index_type
);
1590 max
= TYPE_MAX_VALUE (index_type
);
1592 return (integer_zerop (min
)
1594 : fold (build2 (MINUS_EXPR
, TREE_TYPE (max
), max
, min
)));
1597 /* If arg is static -- a reference to an object in static storage -- then
1598 return the object. This is not the same as the C meaning of `static'.
1599 If arg isn't static, return NULL. */
1604 switch (TREE_CODE (arg
))
1607 /* Nested functions are static, even though taking their address will
1608 involve a trampoline as we unnest the nested function and create
1609 the trampoline on the tree level. */
1613 return ((TREE_STATIC (arg
) || DECL_EXTERNAL (arg
))
1614 && ! DECL_THREAD_LOCAL (arg
)
1615 && ! DECL_NON_ADDR_CONST_P (arg
)
1619 return ((TREE_STATIC (arg
) || DECL_EXTERNAL (arg
))
1623 return TREE_STATIC (arg
) ? arg
: NULL
;
1630 /* If the thing being referenced is not a field, then it is
1631 something language specific. */
1632 if (TREE_CODE (TREE_OPERAND (arg
, 1)) != FIELD_DECL
)
1633 return (*lang_hooks
.staticp
) (arg
);
1635 /* If we are referencing a bitfield, we can't evaluate an
1636 ADDR_EXPR at compile time and so it isn't a constant. */
1637 if (DECL_BIT_FIELD (TREE_OPERAND (arg
, 1)))
1640 return staticp (TREE_OPERAND (arg
, 0));
1645 case MISALIGNED_INDIRECT_REF
:
1646 case ALIGN_INDIRECT_REF
:
1648 return TREE_CONSTANT (TREE_OPERAND (arg
, 0)) ? arg
: NULL
;
1651 case ARRAY_RANGE_REF
:
1652 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg
))) == INTEGER_CST
1653 && TREE_CODE (TREE_OPERAND (arg
, 1)) == INTEGER_CST
)
1654 return staticp (TREE_OPERAND (arg
, 0));
1659 if ((unsigned int) TREE_CODE (arg
)
1660 >= (unsigned int) LAST_AND_UNUSED_TREE_CODE
)
1661 return lang_hooks
.staticp (arg
);
1667 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
1668 Do this to any expression which may be used in more than one place,
1669 but must be evaluated only once.
1671 Normally, expand_expr would reevaluate the expression each time.
1672 Calling save_expr produces something that is evaluated and recorded
1673 the first time expand_expr is called on it. Subsequent calls to
1674 expand_expr just reuse the recorded value.
1676 The call to expand_expr that generates code that actually computes
1677 the value is the first call *at compile time*. Subsequent calls
1678 *at compile time* generate code to use the saved value.
1679 This produces correct result provided that *at run time* control
1680 always flows through the insns made by the first expand_expr
1681 before reaching the other places where the save_expr was evaluated.
1682 You, the caller of save_expr, must make sure this is so.
1684 Constants, and certain read-only nodes, are returned with no
1685 SAVE_EXPR because that is safe. Expressions containing placeholders
1686 are not touched; see tree.def for an explanation of what these
1690 save_expr (tree expr
)
1692 tree t
= fold (expr
);
1695 /* If the tree evaluates to a constant, then we don't want to hide that
1696 fact (i.e. this allows further folding, and direct checks for constants).
1697 However, a read-only object that has side effects cannot be bypassed.
1698 Since it is no problem to reevaluate literals, we just return the
1700 inner
= skip_simple_arithmetic (t
);
1702 if (TREE_INVARIANT (inner
)
1703 || (TREE_READONLY (inner
) && ! TREE_SIDE_EFFECTS (inner
))
1704 || TREE_CODE (inner
) == SAVE_EXPR
1705 || TREE_CODE (inner
) == ERROR_MARK
)
1708 /* If INNER contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
1709 it means that the size or offset of some field of an object depends on
1710 the value within another field.
1712 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
1713 and some variable since it would then need to be both evaluated once and
1714 evaluated more than once. Front-ends must assure this case cannot
1715 happen by surrounding any such subexpressions in their own SAVE_EXPR
1716 and forcing evaluation at the proper time. */
1717 if (contains_placeholder_p (inner
))
1720 t
= build1 (SAVE_EXPR
, TREE_TYPE (expr
), t
);
1722 /* This expression might be placed ahead of a jump to ensure that the
1723 value was computed on both sides of the jump. So make sure it isn't
1724 eliminated as dead. */
1725 TREE_SIDE_EFFECTS (t
) = 1;
1726 TREE_INVARIANT (t
) = 1;
1730 /* Look inside EXPR and into any simple arithmetic operations. Return
1731 the innermost non-arithmetic node. */
1734 skip_simple_arithmetic (tree expr
)
1738 /* We don't care about whether this can be used as an lvalue in this
1740 while (TREE_CODE (expr
) == NON_LVALUE_EXPR
)
1741 expr
= TREE_OPERAND (expr
, 0);
1743 /* If we have simple operations applied to a SAVE_EXPR or to a SAVE_EXPR and
1744 a constant, it will be more efficient to not make another SAVE_EXPR since
1745 it will allow better simplification and GCSE will be able to merge the
1746 computations if they actually occur. */
1750 if (UNARY_CLASS_P (inner
))
1751 inner
= TREE_OPERAND (inner
, 0);
1752 else if (BINARY_CLASS_P (inner
))
1754 if (TREE_INVARIANT (TREE_OPERAND (inner
, 1)))
1755 inner
= TREE_OPERAND (inner
, 0);
1756 else if (TREE_INVARIANT (TREE_OPERAND (inner
, 0)))
1757 inner
= TREE_OPERAND (inner
, 1);
1768 /* Return which tree structure is used by T. */
1770 enum tree_node_structure_enum
1771 tree_node_structure (tree t
)
1773 enum tree_code code
= TREE_CODE (t
);
1775 switch (TREE_CODE_CLASS (code
))
1777 case tcc_declaration
:
1782 case tcc_comparison
:
1785 case tcc_expression
:
1788 default: /* tcc_constant and tcc_exceptional */
1793 /* tcc_constant cases. */
1794 case INTEGER_CST
: return TS_INT_CST
;
1795 case REAL_CST
: return TS_REAL_CST
;
1796 case COMPLEX_CST
: return TS_COMPLEX
;
1797 case VECTOR_CST
: return TS_VECTOR
;
1798 case STRING_CST
: return TS_STRING
;
1799 /* tcc_exceptional cases. */
1800 case ERROR_MARK
: return TS_COMMON
;
1801 case IDENTIFIER_NODE
: return TS_IDENTIFIER
;
1802 case TREE_LIST
: return TS_LIST
;
1803 case TREE_VEC
: return TS_VEC
;
1804 case PHI_NODE
: return TS_PHI_NODE
;
1805 case SSA_NAME
: return TS_SSA_NAME
;
1806 case PLACEHOLDER_EXPR
: return TS_COMMON
;
1807 case STATEMENT_LIST
: return TS_STATEMENT_LIST
;
1808 case BLOCK
: return TS_BLOCK
;
1809 case TREE_BINFO
: return TS_BINFO
;
1810 case VALUE_HANDLE
: return TS_VALUE_HANDLE
;
1817 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
1818 or offset that depends on a field within a record. */
1821 contains_placeholder_p (tree exp
)
1823 enum tree_code code
;
1828 code
= TREE_CODE (exp
);
1829 if (code
== PLACEHOLDER_EXPR
)
1832 switch (TREE_CODE_CLASS (code
))
1835 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
1836 position computations since they will be converted into a
1837 WITH_RECORD_EXPR involving the reference, which will assume
1838 here will be valid. */
1839 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0));
1841 case tcc_exceptional
:
1842 if (code
== TREE_LIST
)
1843 return (CONTAINS_PLACEHOLDER_P (TREE_VALUE (exp
))
1844 || CONTAINS_PLACEHOLDER_P (TREE_CHAIN (exp
)));
1849 case tcc_comparison
:
1850 case tcc_expression
:
1854 /* Ignoring the first operand isn't quite right, but works best. */
1855 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1));
1858 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0))
1859 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1))
1860 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 2)));
1866 switch (TREE_CODE_LENGTH (code
))
1869 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0));
1871 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0))
1872 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1)));
1883 /* Return true if any part of the computation of TYPE involves a
1884 PLACEHOLDER_EXPR. This includes size, bounds, qualifiers
1885 (for QUAL_UNION_TYPE) and field positions. */
1888 type_contains_placeholder_1 (tree type
)
1890 /* If the size contains a placeholder or the parent type (component type in
1891 the case of arrays) type involves a placeholder, this type does. */
1892 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type
))
1893 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (type
))
1894 || (TREE_TYPE (type
) != 0
1895 && type_contains_placeholder_p (TREE_TYPE (type
))))
1898 /* Now do type-specific checks. Note that the last part of the check above
1899 greatly limits what we have to do below. */
1900 switch (TREE_CODE (type
))
1909 case REFERENCE_TYPE
:
1918 /* Here we just check the bounds. */
1919 return (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (type
))
1920 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (type
)));
1923 /* We're already checked the component type (TREE_TYPE), so just check
1925 return type_contains_placeholder_p (TYPE_DOMAIN (type
));
1929 case QUAL_UNION_TYPE
:
1933 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
1934 if (TREE_CODE (field
) == FIELD_DECL
1935 && (CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (field
))
1936 || (TREE_CODE (type
) == QUAL_UNION_TYPE
1937 && CONTAINS_PLACEHOLDER_P (DECL_QUALIFIER (field
)))
1938 || type_contains_placeholder_p (TREE_TYPE (field
))))
1950 type_contains_placeholder_p (tree type
)
1954 /* If the contains_placeholder_bits field has been initialized,
1955 then we know the answer. */
1956 if (TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) > 0)
1957 return TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) - 1;
1959 /* Indicate that we've seen this type node, and the answer is false.
1960 This is what we want to return if we run into recursion via fields. */
1961 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) = 1;
1963 /* Compute the real value. */
1964 result
= type_contains_placeholder_1 (type
);
1966 /* Store the real value. */
1967 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) = result
+ 1;
1972 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
1973 return a tree with all occurrences of references to F in a
1974 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
1975 contains only arithmetic expressions or a CALL_EXPR with a
1976 PLACEHOLDER_EXPR occurring only in its arglist. */
1979 substitute_in_expr (tree exp
, tree f
, tree r
)
1981 enum tree_code code
= TREE_CODE (exp
);
1986 /* We handle TREE_LIST and COMPONENT_REF separately. */
1987 if (code
== TREE_LIST
)
1989 op0
= SUBSTITUTE_IN_EXPR (TREE_CHAIN (exp
), f
, r
);
1990 op1
= SUBSTITUTE_IN_EXPR (TREE_VALUE (exp
), f
, r
);
1991 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
1994 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
1996 else if (code
== COMPONENT_REF
)
1998 /* If this expression is getting a value from a PLACEHOLDER_EXPR
1999 and it is the right field, replace it with R. */
2000 for (inner
= TREE_OPERAND (exp
, 0);
2001 REFERENCE_CLASS_P (inner
);
2002 inner
= TREE_OPERAND (inner
, 0))
2004 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
2005 && TREE_OPERAND (exp
, 1) == f
)
2008 /* If this expression hasn't been completed let, leave it alone. */
2009 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
&& TREE_TYPE (inner
) == 0)
2012 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2013 if (op0
== TREE_OPERAND (exp
, 0))
2016 new = fold (build3 (COMPONENT_REF
, TREE_TYPE (exp
),
2017 op0
, TREE_OPERAND (exp
, 1), NULL_TREE
));
2020 switch (TREE_CODE_CLASS (code
))
2023 case tcc_declaration
:
2026 case tcc_exceptional
:
2029 case tcc_comparison
:
2030 case tcc_expression
:
2032 switch (TREE_CODE_LENGTH (code
))
2038 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2039 if (op0
== TREE_OPERAND (exp
, 0))
2042 new = fold (build1 (code
, TREE_TYPE (exp
), op0
));
2046 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2047 op1
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 1), f
, r
);
2049 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
2052 new = fold (build2 (code
, TREE_TYPE (exp
), op0
, op1
));
2056 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2057 op1
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 1), f
, r
);
2058 op2
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 2), f
, r
);
2060 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2061 && op2
== TREE_OPERAND (exp
, 2))
2064 new = fold (build3 (code
, TREE_TYPE (exp
), op0
, op1
, op2
));
2076 TREE_READONLY (new) = TREE_READONLY (exp
);
2080 /* Similar, but look for a PLACEHOLDER_EXPR in EXP and find a replacement
2081 for it within OBJ, a tree that is an object or a chain of references. */
2084 substitute_placeholder_in_expr (tree exp
, tree obj
)
2086 enum tree_code code
= TREE_CODE (exp
);
2087 tree op0
, op1
, op2
, op3
;
2089 /* If this is a PLACEHOLDER_EXPR, see if we find a corresponding type
2090 in the chain of OBJ. */
2091 if (code
== PLACEHOLDER_EXPR
)
2093 tree need_type
= TYPE_MAIN_VARIANT (TREE_TYPE (exp
));
2096 for (elt
= obj
; elt
!= 0;
2097 elt
= ((TREE_CODE (elt
) == COMPOUND_EXPR
2098 || TREE_CODE (elt
) == COND_EXPR
)
2099 ? TREE_OPERAND (elt
, 1)
2100 : (REFERENCE_CLASS_P (elt
)
2101 || UNARY_CLASS_P (elt
)
2102 || BINARY_CLASS_P (elt
)
2103 || EXPRESSION_CLASS_P (elt
))
2104 ? TREE_OPERAND (elt
, 0) : 0))
2105 if (TYPE_MAIN_VARIANT (TREE_TYPE (elt
)) == need_type
)
2108 for (elt
= obj
; elt
!= 0;
2109 elt
= ((TREE_CODE (elt
) == COMPOUND_EXPR
2110 || TREE_CODE (elt
) == COND_EXPR
)
2111 ? TREE_OPERAND (elt
, 1)
2112 : (REFERENCE_CLASS_P (elt
)
2113 || UNARY_CLASS_P (elt
)
2114 || BINARY_CLASS_P (elt
)
2115 || EXPRESSION_CLASS_P (elt
))
2116 ? TREE_OPERAND (elt
, 0) : 0))
2117 if (POINTER_TYPE_P (TREE_TYPE (elt
))
2118 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (elt
)))
2120 return fold (build1 (INDIRECT_REF
, need_type
, elt
));
2122 /* If we didn't find it, return the original PLACEHOLDER_EXPR. If it
2123 survives until RTL generation, there will be an error. */
2127 /* TREE_LIST is special because we need to look at TREE_VALUE
2128 and TREE_CHAIN, not TREE_OPERANDS. */
2129 else if (code
== TREE_LIST
)
2131 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp
), obj
);
2132 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp
), obj
);
2133 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
2136 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
2139 switch (TREE_CODE_CLASS (code
))
2142 case tcc_declaration
:
2145 case tcc_exceptional
:
2148 case tcc_comparison
:
2149 case tcc_expression
:
2152 switch (TREE_CODE_LENGTH (code
))
2158 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2159 if (op0
== TREE_OPERAND (exp
, 0))
2162 return fold (build1 (code
, TREE_TYPE (exp
), op0
));
2165 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2166 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2168 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
2171 return fold (build2 (code
, TREE_TYPE (exp
), op0
, op1
));
2174 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2175 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2176 op2
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 2), obj
);
2178 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2179 && op2
== TREE_OPERAND (exp
, 2))
2182 return fold (build3 (code
, TREE_TYPE (exp
), op0
, op1
, op2
));
2185 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2186 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2187 op2
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 2), obj
);
2188 op3
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 3), obj
);
2190 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2191 && op2
== TREE_OPERAND (exp
, 2)
2192 && op3
== TREE_OPERAND (exp
, 3))
2195 return fold (build4 (code
, TREE_TYPE (exp
), op0
, op1
, op2
, op3
));
2207 /* Stabilize a reference so that we can use it any number of times
2208 without causing its operands to be evaluated more than once.
2209 Returns the stabilized reference. This works by means of save_expr,
2210 so see the caveats in the comments about save_expr.
2212 Also allows conversion expressions whose operands are references.
2213 Any other kind of expression is returned unchanged. */
2216 stabilize_reference (tree ref
)
2219 enum tree_code code
= TREE_CODE (ref
);
2226 /* No action is needed in this case. */
2232 case FIX_TRUNC_EXPR
:
2233 case FIX_FLOOR_EXPR
:
2234 case FIX_ROUND_EXPR
:
2236 result
= build_nt (code
, stabilize_reference (TREE_OPERAND (ref
, 0)));
2240 result
= build_nt (INDIRECT_REF
,
2241 stabilize_reference_1 (TREE_OPERAND (ref
, 0)));
2245 result
= build_nt (COMPONENT_REF
,
2246 stabilize_reference (TREE_OPERAND (ref
, 0)),
2247 TREE_OPERAND (ref
, 1), NULL_TREE
);
2251 result
= build_nt (BIT_FIELD_REF
,
2252 stabilize_reference (TREE_OPERAND (ref
, 0)),
2253 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2254 stabilize_reference_1 (TREE_OPERAND (ref
, 2)));
2258 result
= build_nt (ARRAY_REF
,
2259 stabilize_reference (TREE_OPERAND (ref
, 0)),
2260 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2261 TREE_OPERAND (ref
, 2), TREE_OPERAND (ref
, 3));
2264 case ARRAY_RANGE_REF
:
2265 result
= build_nt (ARRAY_RANGE_REF
,
2266 stabilize_reference (TREE_OPERAND (ref
, 0)),
2267 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2268 TREE_OPERAND (ref
, 2), TREE_OPERAND (ref
, 3));
2272 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2273 it wouldn't be ignored. This matters when dealing with
2275 return stabilize_reference_1 (ref
);
2277 /* If arg isn't a kind of lvalue we recognize, make no change.
2278 Caller should recognize the error for an invalid lvalue. */
2283 return error_mark_node
;
2286 TREE_TYPE (result
) = TREE_TYPE (ref
);
2287 TREE_READONLY (result
) = TREE_READONLY (ref
);
2288 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (ref
);
2289 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (ref
);
2294 /* Subroutine of stabilize_reference; this is called for subtrees of
2295 references. Any expression with side-effects must be put in a SAVE_EXPR
2296 to ensure that it is only evaluated once.
2298 We don't put SAVE_EXPR nodes around everything, because assigning very
2299 simple expressions to temporaries causes us to miss good opportunities
2300 for optimizations. Among other things, the opportunity to fold in the
2301 addition of a constant into an addressing mode often gets lost, e.g.
2302 "y[i+1] += x;". In general, we take the approach that we should not make
2303 an assignment unless we are forced into it - i.e., that any non-side effect
2304 operator should be allowed, and that cse should take care of coalescing
2305 multiple utterances of the same expression should that prove fruitful. */
2308 stabilize_reference_1 (tree e
)
2311 enum tree_code code
= TREE_CODE (e
);
2313 /* We cannot ignore const expressions because it might be a reference
2314 to a const array but whose index contains side-effects. But we can
2315 ignore things that are actual constant or that already have been
2316 handled by this function. */
2318 if (TREE_INVARIANT (e
))
2321 switch (TREE_CODE_CLASS (code
))
2323 case tcc_exceptional
:
2325 case tcc_declaration
:
2326 case tcc_comparison
:
2328 case tcc_expression
:
2330 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2331 so that it will only be evaluated once. */
2332 /* The reference (r) and comparison (<) classes could be handled as
2333 below, but it is generally faster to only evaluate them once. */
2334 if (TREE_SIDE_EFFECTS (e
))
2335 return save_expr (e
);
2339 /* Constants need no processing. In fact, we should never reach
2344 /* Division is slow and tends to be compiled with jumps,
2345 especially the division by powers of 2 that is often
2346 found inside of an array reference. So do it just once. */
2347 if (code
== TRUNC_DIV_EXPR
|| code
== TRUNC_MOD_EXPR
2348 || code
== FLOOR_DIV_EXPR
|| code
== FLOOR_MOD_EXPR
2349 || code
== CEIL_DIV_EXPR
|| code
== CEIL_MOD_EXPR
2350 || code
== ROUND_DIV_EXPR
|| code
== ROUND_MOD_EXPR
)
2351 return save_expr (e
);
2352 /* Recursively stabilize each operand. */
2353 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)),
2354 stabilize_reference_1 (TREE_OPERAND (e
, 1)));
2358 /* Recursively stabilize each operand. */
2359 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)));
2366 TREE_TYPE (result
) = TREE_TYPE (e
);
2367 TREE_READONLY (result
) = TREE_READONLY (e
);
2368 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (e
);
2369 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (e
);
2370 TREE_INVARIANT (result
) = 1;
2375 /* Low-level constructors for expressions. */
2377 /* A helper function for build1 and constant folders. Set TREE_CONSTANT,
2378 TREE_INVARIANT, and TREE_SIDE_EFFECTS for an ADDR_EXPR. */
2381 recompute_tree_invarant_for_addr_expr (tree t
)
2384 bool tc
= true, ti
= true, se
= false;
2386 /* We started out assuming this address is both invariant and constant, but
2387 does not have side effects. Now go down any handled components and see if
2388 any of them involve offsets that are either non-constant or non-invariant.
2389 Also check for side-effects.
2391 ??? Note that this code makes no attempt to deal with the case where
2392 taking the address of something causes a copy due to misalignment. */
2394 #define UPDATE_TITCSE(NODE) \
2395 do { tree _node = (NODE); \
2396 if (_node && !TREE_INVARIANT (_node)) ti = false; \
2397 if (_node && !TREE_CONSTANT (_node)) tc = false; \
2398 if (_node && TREE_SIDE_EFFECTS (_node)) se = true; } while (0)
2400 for (node
= TREE_OPERAND (t
, 0); handled_component_p (node
);
2401 node
= TREE_OPERAND (node
, 0))
2403 /* If the first operand doesn't have an ARRAY_TYPE, this is a bogus
2404 array reference (probably made temporarily by the G++ front end),
2405 so ignore all the operands. */
2406 if ((TREE_CODE (node
) == ARRAY_REF
2407 || TREE_CODE (node
) == ARRAY_RANGE_REF
)
2408 && TREE_CODE (TREE_TYPE (TREE_OPERAND (node
, 0))) == ARRAY_TYPE
)
2410 UPDATE_TITCSE (TREE_OPERAND (node
, 1));
2411 if (TREE_OPERAND (node
, 2))
2412 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2413 if (TREE_OPERAND (node
, 3))
2414 UPDATE_TITCSE (TREE_OPERAND (node
, 3));
2416 /* Likewise, just because this is a COMPONENT_REF doesn't mean we have a
2417 FIELD_DECL, apparently. The G++ front end can put something else
2418 there, at least temporarily. */
2419 else if (TREE_CODE (node
) == COMPONENT_REF
2420 && TREE_CODE (TREE_OPERAND (node
, 1)) == FIELD_DECL
)
2422 if (TREE_OPERAND (node
, 2))
2423 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2425 else if (TREE_CODE (node
) == BIT_FIELD_REF
)
2426 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2429 /* Now see what's inside. If it's an INDIRECT_REF, copy our properties from
2430 the address, since &(*a)->b is a form of addition. If it's a decl, it's
2431 invariant and constant if the decl is static. It's also invariant if it's
2432 a decl in the current function. Taking the address of a volatile variable
2433 is not volatile. If it's a constant, the address is both invariant and
2434 constant. Otherwise it's neither. */
2435 if (TREE_CODE (node
) == INDIRECT_REF
)
2436 UPDATE_TITCSE (TREE_OPERAND (node
, 0));
2437 else if (DECL_P (node
))
2441 else if (decl_function_context (node
) == current_function_decl
2442 /* Addresses of thread-local variables are invariant. */
2443 || (TREE_CODE (node
) == VAR_DECL
&& DECL_THREAD_LOCAL (node
)))
2448 else if (CONSTANT_CLASS_P (node
))
2453 se
|= TREE_SIDE_EFFECTS (node
);
2456 TREE_CONSTANT (t
) = tc
;
2457 TREE_INVARIANT (t
) = ti
;
2458 TREE_SIDE_EFFECTS (t
) = se
;
2459 #undef UPDATE_TITCSE
2462 /* Build an expression of code CODE, data type TYPE, and operands as
2463 specified. Expressions and reference nodes can be created this way.
2464 Constants, decls, types and misc nodes cannot be.
2466 We define 5 non-variadic functions, from 0 to 4 arguments. This is
2467 enough for all extant tree codes. These functions can be called
2468 directly (preferably!), but can also be obtained via GCC preprocessor
2469 magic within the build macro. */
2472 build0_stat (enum tree_code code
, tree tt MEM_STAT_DECL
)
2476 gcc_assert (TREE_CODE_LENGTH (code
) == 0);
2478 t
= make_node_stat (code PASS_MEM_STAT
);
2485 build1_stat (enum tree_code code
, tree type
, tree node MEM_STAT_DECL
)
2487 int length
= sizeof (struct tree_exp
);
2488 #ifdef GATHER_STATISTICS
2489 tree_node_kind kind
;
2493 #ifdef GATHER_STATISTICS
2494 switch (TREE_CODE_CLASS (code
))
2496 case tcc_statement
: /* an expression with side effects */
2499 case tcc_reference
: /* a reference */
2507 tree_node_counts
[(int) kind
]++;
2508 tree_node_sizes
[(int) kind
] += length
;
2511 gcc_assert (TREE_CODE_LENGTH (code
) == 1);
2513 t
= ggc_alloc_zone_stat (length
, &tree_zone PASS_MEM_STAT
);
2515 memset (t
, 0, sizeof (struct tree_common
));
2517 TREE_SET_CODE (t
, code
);
2519 TREE_TYPE (t
) = type
;
2520 #ifdef USE_MAPPED_LOCATION
2521 SET_EXPR_LOCATION (t
, UNKNOWN_LOCATION
);
2523 SET_EXPR_LOCUS (t
, NULL
);
2525 TREE_COMPLEXITY (t
) = 0;
2526 TREE_OPERAND (t
, 0) = node
;
2527 TREE_BLOCK (t
) = NULL_TREE
;
2528 if (node
&& !TYPE_P (node
))
2530 TREE_SIDE_EFFECTS (t
) = TREE_SIDE_EFFECTS (node
);
2531 TREE_READONLY (t
) = TREE_READONLY (node
);
2534 if (TREE_CODE_CLASS (code
) == tcc_statement
)
2535 TREE_SIDE_EFFECTS (t
) = 1;
2541 case PREDECREMENT_EXPR
:
2542 case PREINCREMENT_EXPR
:
2543 case POSTDECREMENT_EXPR
:
2544 case POSTINCREMENT_EXPR
:
2545 /* All of these have side-effects, no matter what their
2547 TREE_SIDE_EFFECTS (t
) = 1;
2548 TREE_READONLY (t
) = 0;
2551 case MISALIGNED_INDIRECT_REF
:
2552 case ALIGN_INDIRECT_REF
:
2554 /* Whether a dereference is readonly has nothing to do with whether
2555 its operand is readonly. */
2556 TREE_READONLY (t
) = 0;
2561 recompute_tree_invarant_for_addr_expr (t
);
2565 if (TREE_CODE_CLASS (code
) == tcc_unary
2566 && node
&& !TYPE_P (node
)
2567 && TREE_CONSTANT (node
))
2568 TREE_CONSTANT (t
) = 1;
2569 if (TREE_CODE_CLASS (code
) == tcc_unary
2570 && node
&& TREE_INVARIANT (node
))
2571 TREE_INVARIANT (t
) = 1;
2572 if (TREE_CODE_CLASS (code
) == tcc_reference
2573 && node
&& TREE_THIS_VOLATILE (node
))
2574 TREE_THIS_VOLATILE (t
) = 1;
2581 #define PROCESS_ARG(N) \
2583 TREE_OPERAND (t, N) = arg##N; \
2584 if (arg##N &&!TYPE_P (arg##N)) \
2586 if (TREE_SIDE_EFFECTS (arg##N)) \
2588 if (!TREE_READONLY (arg##N)) \
2590 if (!TREE_CONSTANT (arg##N)) \
2592 if (!TREE_INVARIANT (arg##N)) \
2598 build2_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1 MEM_STAT_DECL
)
2600 bool constant
, read_only
, side_effects
, invariant
;
2603 gcc_assert (TREE_CODE_LENGTH (code
) == 2);
2605 t
= make_node_stat (code PASS_MEM_STAT
);
2608 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
2609 result based on those same flags for the arguments. But if the
2610 arguments aren't really even `tree' expressions, we shouldn't be trying
2613 /* Expressions without side effects may be constant if their
2614 arguments are as well. */
2615 constant
= (TREE_CODE_CLASS (code
) == tcc_comparison
2616 || TREE_CODE_CLASS (code
) == tcc_binary
);
2618 side_effects
= TREE_SIDE_EFFECTS (t
);
2619 invariant
= constant
;
2624 TREE_READONLY (t
) = read_only
;
2625 TREE_CONSTANT (t
) = constant
;
2626 TREE_INVARIANT (t
) = invariant
;
2627 TREE_SIDE_EFFECTS (t
) = side_effects
;
2628 TREE_THIS_VOLATILE (t
)
2629 = (TREE_CODE_CLASS (code
) == tcc_reference
2630 && arg0
&& TREE_THIS_VOLATILE (arg0
));
2636 build3_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
2637 tree arg2 MEM_STAT_DECL
)
2639 bool constant
, read_only
, side_effects
, invariant
;
2642 gcc_assert (TREE_CODE_LENGTH (code
) == 3);
2644 t
= make_node_stat (code PASS_MEM_STAT
);
2647 side_effects
= TREE_SIDE_EFFECTS (t
);
2653 if (code
== CALL_EXPR
&& !side_effects
)
2658 /* Calls have side-effects, except those to const or
2660 i
= call_expr_flags (t
);
2661 if (!(i
& (ECF_CONST
| ECF_PURE
)))
2664 /* And even those have side-effects if their arguments do. */
2665 else for (node
= arg1
; node
; node
= TREE_CHAIN (node
))
2666 if (TREE_SIDE_EFFECTS (TREE_VALUE (node
)))
2673 TREE_SIDE_EFFECTS (t
) = side_effects
;
2674 TREE_THIS_VOLATILE (t
)
2675 = (TREE_CODE_CLASS (code
) == tcc_reference
2676 && arg0
&& TREE_THIS_VOLATILE (arg0
));
2682 build4_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
2683 tree arg2
, tree arg3 MEM_STAT_DECL
)
2685 bool constant
, read_only
, side_effects
, invariant
;
2688 gcc_assert (TREE_CODE_LENGTH (code
) == 4);
2690 t
= make_node_stat (code PASS_MEM_STAT
);
2693 side_effects
= TREE_SIDE_EFFECTS (t
);
2700 TREE_SIDE_EFFECTS (t
) = side_effects
;
2701 TREE_THIS_VOLATILE (t
)
2702 = (TREE_CODE_CLASS (code
) == tcc_reference
2703 && arg0
&& TREE_THIS_VOLATILE (arg0
));
2708 /* Backup definition for non-gcc build compilers. */
2711 (build
) (enum tree_code code
, tree tt
, ...)
2713 tree t
, arg0
, arg1
, arg2
, arg3
;
2714 int length
= TREE_CODE_LENGTH (code
);
2721 t
= build0 (code
, tt
);
2724 arg0
= va_arg (p
, tree
);
2725 t
= build1 (code
, tt
, arg0
);
2728 arg0
= va_arg (p
, tree
);
2729 arg1
= va_arg (p
, tree
);
2730 t
= build2 (code
, tt
, arg0
, arg1
);
2733 arg0
= va_arg (p
, tree
);
2734 arg1
= va_arg (p
, tree
);
2735 arg2
= va_arg (p
, tree
);
2736 t
= build3 (code
, tt
, arg0
, arg1
, arg2
);
2739 arg0
= va_arg (p
, tree
);
2740 arg1
= va_arg (p
, tree
);
2741 arg2
= va_arg (p
, tree
);
2742 arg3
= va_arg (p
, tree
);
2743 t
= build4 (code
, tt
, arg0
, arg1
, arg2
, arg3
);
2753 /* Similar except don't specify the TREE_TYPE
2754 and leave the TREE_SIDE_EFFECTS as 0.
2755 It is permissible for arguments to be null,
2756 or even garbage if their values do not matter. */
2759 build_nt (enum tree_code code
, ...)
2768 t
= make_node (code
);
2769 length
= TREE_CODE_LENGTH (code
);
2771 for (i
= 0; i
< length
; i
++)
2772 TREE_OPERAND (t
, i
) = va_arg (p
, tree
);
2778 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
2779 We do NOT enter this node in any sort of symbol table.
2781 layout_decl is used to set up the decl's storage layout.
2782 Other slots are initialized to 0 or null pointers. */
2785 build_decl_stat (enum tree_code code
, tree name
, tree type MEM_STAT_DECL
)
2789 t
= make_node_stat (code PASS_MEM_STAT
);
2791 /* if (type == error_mark_node)
2792 type = integer_type_node; */
2793 /* That is not done, deliberately, so that having error_mark_node
2794 as the type can suppress useless errors in the use of this variable. */
2796 DECL_NAME (t
) = name
;
2797 TREE_TYPE (t
) = type
;
2799 if (code
== VAR_DECL
|| code
== PARM_DECL
|| code
== RESULT_DECL
)
2801 else if (code
== FUNCTION_DECL
)
2802 DECL_MODE (t
) = FUNCTION_MODE
;
2804 /* Set default visibility to whatever the user supplied with
2805 visibility_specified depending on #pragma GCC visibility. */
2806 DECL_VISIBILITY (t
) = default_visibility
;
2807 DECL_VISIBILITY_SPECIFIED (t
) = visibility_options
.inpragma
;
2812 /* BLOCK nodes are used to represent the structure of binding contours
2813 and declarations, once those contours have been exited and their contents
2814 compiled. This information is used for outputting debugging info. */
2817 build_block (tree vars
, tree tags ATTRIBUTE_UNUSED
, tree subblocks
,
2818 tree supercontext
, tree chain
)
2820 tree block
= make_node (BLOCK
);
2822 BLOCK_VARS (block
) = vars
;
2823 BLOCK_SUBBLOCKS (block
) = subblocks
;
2824 BLOCK_SUPERCONTEXT (block
) = supercontext
;
2825 BLOCK_CHAIN (block
) = chain
;
2829 #if 1 /* ! defined(USE_MAPPED_LOCATION) */
2830 /* ??? gengtype doesn't handle conditionals */
2831 static GTY(()) tree last_annotated_node
;
2834 #ifdef USE_MAPPED_LOCATION
2837 expand_location (source_location loc
)
2839 expanded_location xloc
;
2840 if (loc
== 0) { xloc
.file
= NULL
; xloc
.line
= 0; xloc
.column
= 0; }
2843 const struct line_map
*map
= linemap_lookup (&line_table
, loc
);
2844 xloc
.file
= map
->to_file
;
2845 xloc
.line
= SOURCE_LINE (map
, loc
);
2846 xloc
.column
= SOURCE_COLUMN (map
, loc
);
2853 /* Record the exact location where an expression or an identifier were
2857 annotate_with_file_line (tree node
, const char *file
, int line
)
2859 /* Roughly one percent of the calls to this function are to annotate
2860 a node with the same information already attached to that node!
2861 Just return instead of wasting memory. */
2862 if (EXPR_LOCUS (node
)
2863 && (EXPR_FILENAME (node
) == file
2864 || ! strcmp (EXPR_FILENAME (node
), file
))
2865 && EXPR_LINENO (node
) == line
)
2867 last_annotated_node
= node
;
2871 /* In heavily macroized code (such as GCC itself) this single
2872 entry cache can reduce the number of allocations by more
2874 if (last_annotated_node
2875 && EXPR_LOCUS (last_annotated_node
)
2876 && (EXPR_FILENAME (last_annotated_node
) == file
2877 || ! strcmp (EXPR_FILENAME (last_annotated_node
), file
))
2878 && EXPR_LINENO (last_annotated_node
) == line
)
2880 SET_EXPR_LOCUS (node
, EXPR_LOCUS (last_annotated_node
));
2884 SET_EXPR_LOCUS (node
, ggc_alloc (sizeof (location_t
)));
2885 EXPR_LINENO (node
) = line
;
2886 EXPR_FILENAME (node
) = file
;
2887 last_annotated_node
= node
;
2891 annotate_with_locus (tree node
, location_t locus
)
2893 annotate_with_file_line (node
, locus
.file
, locus
.line
);
2897 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
2901 build_decl_attribute_variant (tree ddecl
, tree attribute
)
2903 DECL_ATTRIBUTES (ddecl
) = attribute
;
2907 /* Borrowed from hashtab.c iterative_hash implementation. */
2908 #define mix(a,b,c) \
2910 a -= b; a -= c; a ^= (c>>13); \
2911 b -= c; b -= a; b ^= (a<< 8); \
2912 c -= a; c -= b; c ^= ((b&0xffffffff)>>13); \
2913 a -= b; a -= c; a ^= ((c&0xffffffff)>>12); \
2914 b -= c; b -= a; b = (b ^ (a<<16)) & 0xffffffff; \
2915 c -= a; c -= b; c = (c ^ (b>> 5)) & 0xffffffff; \
2916 a -= b; a -= c; a = (a ^ (c>> 3)) & 0xffffffff; \
2917 b -= c; b -= a; b = (b ^ (a<<10)) & 0xffffffff; \
2918 c -= a; c -= b; c = (c ^ (b>>15)) & 0xffffffff; \
2922 /* Produce good hash value combining VAL and VAL2. */
2923 static inline hashval_t
2924 iterative_hash_hashval_t (hashval_t val
, hashval_t val2
)
2926 /* the golden ratio; an arbitrary value. */
2927 hashval_t a
= 0x9e3779b9;
2933 /* Produce good hash value combining PTR and VAL2. */
2934 static inline hashval_t
2935 iterative_hash_pointer (void *ptr
, hashval_t val2
)
2937 if (sizeof (ptr
) == sizeof (hashval_t
))
2938 return iterative_hash_hashval_t ((size_t) ptr
, val2
);
2941 hashval_t a
= (hashval_t
) (size_t) ptr
;
2942 /* Avoid warnings about shifting of more than the width of the type on
2943 hosts that won't execute this path. */
2945 hashval_t b
= (hashval_t
) ((size_t) ptr
>> (sizeof (hashval_t
) * 8 + zero
));
2951 /* Produce good hash value combining VAL and VAL2. */
2952 static inline hashval_t
2953 iterative_hash_host_wide_int (HOST_WIDE_INT val
, hashval_t val2
)
2955 if (sizeof (HOST_WIDE_INT
) == sizeof (hashval_t
))
2956 return iterative_hash_hashval_t (val
, val2
);
2959 hashval_t a
= (hashval_t
) val
;
2960 /* Avoid warnings about shifting of more than the width of the type on
2961 hosts that won't execute this path. */
2963 hashval_t b
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 8 + zero
));
2965 if (sizeof (HOST_WIDE_INT
) > 2 * sizeof (hashval_t
))
2967 hashval_t a
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 16 + zero
));
2968 hashval_t b
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 24 + zero
));
2975 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
2978 Record such modified types already made so we don't make duplicates. */
2981 build_type_attribute_variant (tree ttype
, tree attribute
)
2983 if (! attribute_list_equal (TYPE_ATTRIBUTES (ttype
), attribute
))
2985 hashval_t hashcode
= 0;
2987 enum tree_code code
= TREE_CODE (ttype
);
2989 ntype
= copy_node (ttype
);
2991 TYPE_POINTER_TO (ntype
) = 0;
2992 TYPE_REFERENCE_TO (ntype
) = 0;
2993 TYPE_ATTRIBUTES (ntype
) = attribute
;
2995 /* Create a new main variant of TYPE. */
2996 TYPE_MAIN_VARIANT (ntype
) = ntype
;
2997 TYPE_NEXT_VARIANT (ntype
) = 0;
2998 set_type_quals (ntype
, TYPE_UNQUALIFIED
);
3000 hashcode
= iterative_hash_object (code
, hashcode
);
3001 if (TREE_TYPE (ntype
))
3002 hashcode
= iterative_hash_object (TYPE_HASH (TREE_TYPE (ntype
)),
3004 hashcode
= attribute_hash_list (attribute
, hashcode
);
3006 switch (TREE_CODE (ntype
))
3009 hashcode
= type_hash_list (TYPE_ARG_TYPES (ntype
), hashcode
);
3012 hashcode
= iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (ntype
)),
3016 hashcode
= iterative_hash_object
3017 (TREE_INT_CST_LOW (TYPE_MAX_VALUE (ntype
)), hashcode
);
3018 hashcode
= iterative_hash_object
3019 (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (ntype
)), hashcode
);
3023 unsigned int precision
= TYPE_PRECISION (ntype
);
3024 hashcode
= iterative_hash_object (precision
, hashcode
);
3031 ntype
= type_hash_canon (hashcode
, ntype
);
3032 ttype
= build_qualified_type (ntype
, TYPE_QUALS (ttype
));
3039 /* Return nonzero if IDENT is a valid name for attribute ATTR,
3042 We try both `text' and `__text__', ATTR may be either one. */
3043 /* ??? It might be a reasonable simplification to require ATTR to be only
3044 `text'. One might then also require attribute lists to be stored in
3045 their canonicalized form. */
3048 is_attribute_with_length_p (const char *attr
, int attr_len
, tree ident
)
3053 if (TREE_CODE (ident
) != IDENTIFIER_NODE
)
3056 p
= IDENTIFIER_POINTER (ident
);
3057 ident_len
= IDENTIFIER_LENGTH (ident
);
3059 if (ident_len
== attr_len
3060 && strcmp (attr
, p
) == 0)
3063 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
3066 gcc_assert (attr
[1] == '_');
3067 gcc_assert (attr
[attr_len
- 2] == '_');
3068 gcc_assert (attr
[attr_len
- 1] == '_');
3069 gcc_assert (attr
[1] == '_');
3070 if (ident_len
== attr_len
- 4
3071 && strncmp (attr
+ 2, p
, attr_len
- 4) == 0)
3076 if (ident_len
== attr_len
+ 4
3077 && p
[0] == '_' && p
[1] == '_'
3078 && p
[ident_len
- 2] == '_' && p
[ident_len
- 1] == '_'
3079 && strncmp (attr
, p
+ 2, attr_len
) == 0)
3086 /* Return nonzero if IDENT is a valid name for attribute ATTR,
3089 We try both `text' and `__text__', ATTR may be either one. */
3092 is_attribute_p (const char *attr
, tree ident
)
3094 return is_attribute_with_length_p (attr
, strlen (attr
), ident
);
3097 /* Given an attribute name and a list of attributes, return a pointer to the
3098 attribute's list element if the attribute is part of the list, or NULL_TREE
3099 if not found. If the attribute appears more than once, this only
3100 returns the first occurrence; the TREE_CHAIN of the return value should
3101 be passed back in if further occurrences are wanted. */
3104 lookup_attribute (const char *attr_name
, tree list
)
3107 size_t attr_len
= strlen (attr_name
);
3109 for (l
= list
; l
; l
= TREE_CHAIN (l
))
3111 gcc_assert (TREE_CODE (TREE_PURPOSE (l
)) == IDENTIFIER_NODE
);
3112 if (is_attribute_with_length_p (attr_name
, attr_len
, TREE_PURPOSE (l
)))
3119 /* Return an attribute list that is the union of a1 and a2. */
3122 merge_attributes (tree a1
, tree a2
)
3126 /* Either one unset? Take the set one. */
3128 if ((attributes
= a1
) == 0)
3131 /* One that completely contains the other? Take it. */
3133 else if (a2
!= 0 && ! attribute_list_contained (a1
, a2
))
3135 if (attribute_list_contained (a2
, a1
))
3139 /* Pick the longest list, and hang on the other list. */
3141 if (list_length (a1
) < list_length (a2
))
3142 attributes
= a2
, a2
= a1
;
3144 for (; a2
!= 0; a2
= TREE_CHAIN (a2
))
3147 for (a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
3150 a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
3153 if (simple_cst_equal (TREE_VALUE (a
), TREE_VALUE (a2
)) == 1)
3158 a1
= copy_node (a2
);
3159 TREE_CHAIN (a1
) = attributes
;
3168 /* Given types T1 and T2, merge their attributes and return
3172 merge_type_attributes (tree t1
, tree t2
)
3174 return merge_attributes (TYPE_ATTRIBUTES (t1
),
3175 TYPE_ATTRIBUTES (t2
));
3178 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
3182 merge_decl_attributes (tree olddecl
, tree newdecl
)
3184 return merge_attributes (DECL_ATTRIBUTES (olddecl
),
3185 DECL_ATTRIBUTES (newdecl
));
3188 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
3190 /* Specialization of merge_decl_attributes for various Windows targets.
3192 This handles the following situation:
3194 __declspec (dllimport) int foo;
3197 The second instance of `foo' nullifies the dllimport. */
3200 merge_dllimport_decl_attributes (tree old
, tree
new)
3203 int delete_dllimport_p
;
3205 old
= DECL_ATTRIBUTES (old
);
3206 new = DECL_ATTRIBUTES (new);
3208 /* What we need to do here is remove from `old' dllimport if it doesn't
3209 appear in `new'. dllimport behaves like extern: if a declaration is
3210 marked dllimport and a definition appears later, then the object
3211 is not dllimport'd. */
3212 if (lookup_attribute ("dllimport", old
) != NULL_TREE
3213 && lookup_attribute ("dllimport", new) == NULL_TREE
)
3214 delete_dllimport_p
= 1;
3216 delete_dllimport_p
= 0;
3218 a
= merge_attributes (old
, new);
3220 if (delete_dllimport_p
)
3224 /* Scan the list for dllimport and delete it. */
3225 for (prev
= NULL_TREE
, t
= a
; t
; prev
= t
, t
= TREE_CHAIN (t
))
3227 if (is_attribute_p ("dllimport", TREE_PURPOSE (t
)))
3229 if (prev
== NULL_TREE
)
3232 TREE_CHAIN (prev
) = TREE_CHAIN (t
);
3241 /* Handle a "dllimport" or "dllexport" attribute; arguments as in
3242 struct attribute_spec.handler. */
3245 handle_dll_attribute (tree
* pnode
, tree name
, tree args
, int flags
,
3250 /* These attributes may apply to structure and union types being created,
3251 but otherwise should pass to the declaration involved. */
3254 if (flags
& ((int) ATTR_FLAG_DECL_NEXT
| (int) ATTR_FLAG_FUNCTION_NEXT
3255 | (int) ATTR_FLAG_ARRAY_NEXT
))
3257 *no_add_attrs
= true;
3258 return tree_cons (name
, args
, NULL_TREE
);
3260 if (TREE_CODE (node
) != RECORD_TYPE
&& TREE_CODE (node
) != UNION_TYPE
)
3262 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name
));
3263 *no_add_attrs
= true;
3269 /* Report error on dllimport ambiguities seen now before they cause
3271 if (is_attribute_p ("dllimport", name
))
3273 /* Like MS, treat definition of dllimported variables and
3274 non-inlined functions on declaration as syntax errors. We
3275 allow the attribute for function definitions if declared
3277 if (TREE_CODE (node
) == FUNCTION_DECL
&& DECL_INITIAL (node
)
3278 && !DECL_DECLARED_INLINE_P (node
))
3280 error ("%Jfunction %qD definition is marked dllimport.", node
, node
);
3281 *no_add_attrs
= true;
3284 else if (TREE_CODE (node
) == VAR_DECL
)
3286 if (DECL_INITIAL (node
))
3288 error ("%Jvariable %qD definition is marked dllimport.",
3290 *no_add_attrs
= true;
3293 /* `extern' needn't be specified with dllimport.
3294 Specify `extern' now and hope for the best. Sigh. */
3295 DECL_EXTERNAL (node
) = 1;
3296 /* Also, implicitly give dllimport'd variables declared within
3297 a function global scope, unless declared static. */
3298 if (current_function_decl
!= NULL_TREE
&& !TREE_STATIC (node
))
3299 TREE_PUBLIC (node
) = 1;
3303 /* Report error if symbol is not accessible at global scope. */
3304 if (!TREE_PUBLIC (node
)
3305 && (TREE_CODE (node
) == VAR_DECL
3306 || TREE_CODE (node
) == FUNCTION_DECL
))
3308 error ("%Jexternal linkage required for symbol %qD because of "
3309 "%qs attribute.", node
, node
, IDENTIFIER_POINTER (name
));
3310 *no_add_attrs
= true;
3316 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
3318 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
3319 of the various TYPE_QUAL values. */
3322 set_type_quals (tree type
, int type_quals
)
3324 TYPE_READONLY (type
) = (type_quals
& TYPE_QUAL_CONST
) != 0;
3325 TYPE_VOLATILE (type
) = (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
3326 TYPE_RESTRICT (type
) = (type_quals
& TYPE_QUAL_RESTRICT
) != 0;
3329 /* Returns true iff cand is equivalent to base with type_quals. */
3332 check_qualified_type (tree cand
, tree base
, int type_quals
)
3334 return (TYPE_QUALS (cand
) == type_quals
3335 && TYPE_NAME (cand
) == TYPE_NAME (base
)
3336 /* Apparently this is needed for Objective-C. */
3337 && TYPE_CONTEXT (cand
) == TYPE_CONTEXT (base
)
3338 && attribute_list_equal (TYPE_ATTRIBUTES (cand
),
3339 TYPE_ATTRIBUTES (base
)));
3342 /* Return a version of the TYPE, qualified as indicated by the
3343 TYPE_QUALS, if one exists. If no qualified version exists yet,
3344 return NULL_TREE. */
3347 get_qualified_type (tree type
, int type_quals
)
3351 if (TYPE_QUALS (type
) == type_quals
)
3354 /* Search the chain of variants to see if there is already one there just
3355 like the one we need to have. If so, use that existing one. We must
3356 preserve the TYPE_NAME, since there is code that depends on this. */
3357 for (t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
3358 if (check_qualified_type (t
, type
, type_quals
))
3364 /* Like get_qualified_type, but creates the type if it does not
3365 exist. This function never returns NULL_TREE. */
3368 build_qualified_type (tree type
, int type_quals
)
3372 /* See if we already have the appropriate qualified variant. */
3373 t
= get_qualified_type (type
, type_quals
);
3375 /* If not, build it. */
3378 t
= build_variant_type_copy (type
);
3379 set_type_quals (t
, type_quals
);
3385 /* Create a new distinct copy of TYPE. The new type is made its own
3389 build_distinct_type_copy (tree type
)
3391 tree t
= copy_node (type
);
3393 TYPE_POINTER_TO (t
) = 0;
3394 TYPE_REFERENCE_TO (t
) = 0;
3396 /* Make it its own variant. */
3397 TYPE_MAIN_VARIANT (t
) = t
;
3398 TYPE_NEXT_VARIANT (t
) = 0;
3403 /* Create a new variant of TYPE, equivalent but distinct.
3404 This is so the caller can modify it. */
3407 build_variant_type_copy (tree type
)
3409 tree t
, m
= TYPE_MAIN_VARIANT (type
);
3411 t
= build_distinct_type_copy (type
);
3413 /* Add the new type to the chain of variants of TYPE. */
3414 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (m
);
3415 TYPE_NEXT_VARIANT (m
) = t
;
3416 TYPE_MAIN_VARIANT (t
) = m
;
3421 /* Hashing of types so that we don't make duplicates.
3422 The entry point is `type_hash_canon'. */
3424 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
3425 with types in the TREE_VALUE slots), by adding the hash codes
3426 of the individual types. */
3429 type_hash_list (tree list
, hashval_t hashcode
)
3433 for (tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3434 if (TREE_VALUE (tail
) != error_mark_node
)
3435 hashcode
= iterative_hash_object (TYPE_HASH (TREE_VALUE (tail
)),
3441 /* These are the Hashtable callback functions. */
3443 /* Returns true iff the types are equivalent. */
3446 type_hash_eq (const void *va
, const void *vb
)
3448 const struct type_hash
*a
= va
, *b
= vb
;
3450 /* First test the things that are the same for all types. */
3451 if (a
->hash
!= b
->hash
3452 || TREE_CODE (a
->type
) != TREE_CODE (b
->type
)
3453 || TREE_TYPE (a
->type
) != TREE_TYPE (b
->type
)
3454 || !attribute_list_equal (TYPE_ATTRIBUTES (a
->type
),
3455 TYPE_ATTRIBUTES (b
->type
))
3456 || TYPE_ALIGN (a
->type
) != TYPE_ALIGN (b
->type
)
3457 || TYPE_MODE (a
->type
) != TYPE_MODE (b
->type
))
3460 switch (TREE_CODE (a
->type
))
3465 case REFERENCE_TYPE
:
3469 return TYPE_VECTOR_SUBPARTS (a
->type
) == TYPE_VECTOR_SUBPARTS (b
->type
);
3472 if (TYPE_VALUES (a
->type
) != TYPE_VALUES (b
->type
)
3473 && !(TYPE_VALUES (a
->type
)
3474 && TREE_CODE (TYPE_VALUES (a
->type
)) == TREE_LIST
3475 && TYPE_VALUES (b
->type
)
3476 && TREE_CODE (TYPE_VALUES (b
->type
)) == TREE_LIST
3477 && type_list_equal (TYPE_VALUES (a
->type
),
3478 TYPE_VALUES (b
->type
))))
3481 /* ... fall through ... */
3487 return ((TYPE_MAX_VALUE (a
->type
) == TYPE_MAX_VALUE (b
->type
)
3488 || tree_int_cst_equal (TYPE_MAX_VALUE (a
->type
),
3489 TYPE_MAX_VALUE (b
->type
)))
3490 && (TYPE_MIN_VALUE (a
->type
) == TYPE_MIN_VALUE (b
->type
)
3491 || tree_int_cst_equal (TYPE_MIN_VALUE (a
->type
),
3492 TYPE_MIN_VALUE (b
->type
))));
3495 return TYPE_OFFSET_BASETYPE (a
->type
) == TYPE_OFFSET_BASETYPE (b
->type
);
3498 return (TYPE_METHOD_BASETYPE (a
->type
) == TYPE_METHOD_BASETYPE (b
->type
)
3499 && (TYPE_ARG_TYPES (a
->type
) == TYPE_ARG_TYPES (b
->type
)
3500 || (TYPE_ARG_TYPES (a
->type
)
3501 && TREE_CODE (TYPE_ARG_TYPES (a
->type
)) == TREE_LIST
3502 && TYPE_ARG_TYPES (b
->type
)
3503 && TREE_CODE (TYPE_ARG_TYPES (b
->type
)) == TREE_LIST
3504 && type_list_equal (TYPE_ARG_TYPES (a
->type
),
3505 TYPE_ARG_TYPES (b
->type
)))));
3508 return TYPE_DOMAIN (a
->type
) == TYPE_DOMAIN (b
->type
);
3512 case QUAL_UNION_TYPE
:
3513 return (TYPE_FIELDS (a
->type
) == TYPE_FIELDS (b
->type
)
3514 || (TYPE_FIELDS (a
->type
)
3515 && TREE_CODE (TYPE_FIELDS (a
->type
)) == TREE_LIST
3516 && TYPE_FIELDS (b
->type
)
3517 && TREE_CODE (TYPE_FIELDS (b
->type
)) == TREE_LIST
3518 && type_list_equal (TYPE_FIELDS (a
->type
),
3519 TYPE_FIELDS (b
->type
))));
3522 return (TYPE_ARG_TYPES (a
->type
) == TYPE_ARG_TYPES (b
->type
)
3523 || (TYPE_ARG_TYPES (a
->type
)
3524 && TREE_CODE (TYPE_ARG_TYPES (a
->type
)) == TREE_LIST
3525 && TYPE_ARG_TYPES (b
->type
)
3526 && TREE_CODE (TYPE_ARG_TYPES (b
->type
)) == TREE_LIST
3527 && type_list_equal (TYPE_ARG_TYPES (a
->type
),
3528 TYPE_ARG_TYPES (b
->type
))));
3535 /* Return the cached hash value. */
3538 type_hash_hash (const void *item
)
3540 return ((const struct type_hash
*) item
)->hash
;
3543 /* Look in the type hash table for a type isomorphic to TYPE.
3544 If one is found, return it. Otherwise return 0. */
3547 type_hash_lookup (hashval_t hashcode
, tree type
)
3549 struct type_hash
*h
, in
;
3551 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
3552 must call that routine before comparing TYPE_ALIGNs. */
3558 h
= htab_find_with_hash (type_hash_table
, &in
, hashcode
);
3564 /* Add an entry to the type-hash-table
3565 for a type TYPE whose hash code is HASHCODE. */
3568 type_hash_add (hashval_t hashcode
, tree type
)
3570 struct type_hash
*h
;
3573 h
= ggc_alloc (sizeof (struct type_hash
));
3576 loc
= htab_find_slot_with_hash (type_hash_table
, h
, hashcode
, INSERT
);
3577 *(struct type_hash
**) loc
= h
;
3580 /* Given TYPE, and HASHCODE its hash code, return the canonical
3581 object for an identical type if one already exists.
3582 Otherwise, return TYPE, and record it as the canonical object.
3584 To use this function, first create a type of the sort you want.
3585 Then compute its hash code from the fields of the type that
3586 make it different from other similar types.
3587 Then call this function and use the value. */
3590 type_hash_canon (unsigned int hashcode
, tree type
)
3594 /* The hash table only contains main variants, so ensure that's what we're
3596 gcc_assert (TYPE_MAIN_VARIANT (type
) == type
);
3598 if (!lang_hooks
.types
.hash_types
)
3601 /* See if the type is in the hash table already. If so, return it.
3602 Otherwise, add the type. */
3603 t1
= type_hash_lookup (hashcode
, type
);
3606 #ifdef GATHER_STATISTICS
3607 tree_node_counts
[(int) t_kind
]--;
3608 tree_node_sizes
[(int) t_kind
] -= sizeof (struct tree_type
);
3614 type_hash_add (hashcode
, type
);
3619 /* See if the data pointed to by the type hash table is marked. We consider
3620 it marked if the type is marked or if a debug type number or symbol
3621 table entry has been made for the type. This reduces the amount of
3622 debugging output and eliminates that dependency of the debug output on
3623 the number of garbage collections. */
3626 type_hash_marked_p (const void *p
)
3628 tree type
= ((struct type_hash
*) p
)->type
;
3630 return ggc_marked_p (type
) || TYPE_SYMTAB_POINTER (type
);
3634 print_type_hash_statistics (void)
3636 fprintf (stderr
, "Type hash: size %ld, %ld elements, %f collisions\n",
3637 (long) htab_size (type_hash_table
),
3638 (long) htab_elements (type_hash_table
),
3639 htab_collisions (type_hash_table
));
3642 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
3643 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
3644 by adding the hash codes of the individual attributes. */
3647 attribute_hash_list (tree list
, hashval_t hashcode
)
3651 for (tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3652 /* ??? Do we want to add in TREE_VALUE too? */
3653 hashcode
= iterative_hash_object
3654 (IDENTIFIER_HASH_VALUE (TREE_PURPOSE (tail
)), hashcode
);
3658 /* Given two lists of attributes, return true if list l2 is
3659 equivalent to l1. */
3662 attribute_list_equal (tree l1
, tree l2
)
3664 return attribute_list_contained (l1
, l2
)
3665 && attribute_list_contained (l2
, l1
);
3668 /* Given two lists of attributes, return true if list L2 is
3669 completely contained within L1. */
3670 /* ??? This would be faster if attribute names were stored in a canonicalized
3671 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
3672 must be used to show these elements are equivalent (which they are). */
3673 /* ??? It's not clear that attributes with arguments will always be handled
3677 attribute_list_contained (tree l1
, tree l2
)
3681 /* First check the obvious, maybe the lists are identical. */
3685 /* Maybe the lists are similar. */
3686 for (t1
= l1
, t2
= l2
;
3688 && TREE_PURPOSE (t1
) == TREE_PURPOSE (t2
)
3689 && TREE_VALUE (t1
) == TREE_VALUE (t2
);
3690 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
));
3692 /* Maybe the lists are equal. */
3693 if (t1
== 0 && t2
== 0)
3696 for (; t2
!= 0; t2
= TREE_CHAIN (t2
))
3699 for (attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)), l1
);
3701 attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)),
3704 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) == 1)
3711 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) != 1)
3718 /* Given two lists of types
3719 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
3720 return 1 if the lists contain the same types in the same order.
3721 Also, the TREE_PURPOSEs must match. */
3724 type_list_equal (tree l1
, tree l2
)
3728 for (t1
= l1
, t2
= l2
; t1
&& t2
; t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
3729 if (TREE_VALUE (t1
) != TREE_VALUE (t2
)
3730 || (TREE_PURPOSE (t1
) != TREE_PURPOSE (t2
)
3731 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1
), TREE_PURPOSE (t2
))
3732 && (TREE_TYPE (TREE_PURPOSE (t1
))
3733 == TREE_TYPE (TREE_PURPOSE (t2
))))))
3739 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
3740 given by TYPE. If the argument list accepts variable arguments,
3741 then this function counts only the ordinary arguments. */
3744 type_num_arguments (tree type
)
3749 for (t
= TYPE_ARG_TYPES (type
); t
; t
= TREE_CHAIN (t
))
3750 /* If the function does not take a variable number of arguments,
3751 the last element in the list will have type `void'. */
3752 if (VOID_TYPE_P (TREE_VALUE (t
)))
3760 /* Nonzero if integer constants T1 and T2
3761 represent the same constant value. */
3764 tree_int_cst_equal (tree t1
, tree t2
)
3769 if (t1
== 0 || t2
== 0)
3772 if (TREE_CODE (t1
) == INTEGER_CST
3773 && TREE_CODE (t2
) == INTEGER_CST
3774 && TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
3775 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
))
3781 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
3782 The precise way of comparison depends on their data type. */
3785 tree_int_cst_lt (tree t1
, tree t2
)
3790 if (TYPE_UNSIGNED (TREE_TYPE (t1
)) != TYPE_UNSIGNED (TREE_TYPE (t2
)))
3792 int t1_sgn
= tree_int_cst_sgn (t1
);
3793 int t2_sgn
= tree_int_cst_sgn (t2
);
3795 if (t1_sgn
< t2_sgn
)
3797 else if (t1_sgn
> t2_sgn
)
3799 /* Otherwise, both are non-negative, so we compare them as
3800 unsigned just in case one of them would overflow a signed
3803 else if (!TYPE_UNSIGNED (TREE_TYPE (t1
)))
3804 return INT_CST_LT (t1
, t2
);
3806 return INT_CST_LT_UNSIGNED (t1
, t2
);
3809 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
3812 tree_int_cst_compare (tree t1
, tree t2
)
3814 if (tree_int_cst_lt (t1
, t2
))
3816 else if (tree_int_cst_lt (t2
, t1
))
3822 /* Return 1 if T is an INTEGER_CST that can be manipulated efficiently on
3823 the host. If POS is zero, the value can be represented in a single
3824 HOST_WIDE_INT. If POS is nonzero, the value must be positive and can
3825 be represented in a single unsigned HOST_WIDE_INT. */
3828 host_integerp (tree t
, int pos
)
3830 return (TREE_CODE (t
) == INTEGER_CST
3831 && ! TREE_OVERFLOW (t
)
3832 && ((TREE_INT_CST_HIGH (t
) == 0
3833 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) >= 0)
3834 || (! pos
&& TREE_INT_CST_HIGH (t
) == -1
3835 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0
3836 && !TYPE_UNSIGNED (TREE_TYPE (t
)))
3837 || (pos
&& TREE_INT_CST_HIGH (t
) == 0)));
3840 /* Return the HOST_WIDE_INT least significant bits of T if it is an
3841 INTEGER_CST and there is no overflow. POS is nonzero if the result must
3842 be positive. Abort if we cannot satisfy the above conditions. */
3845 tree_low_cst (tree t
, int pos
)
3847 gcc_assert (host_integerp (t
, pos
));
3848 return TREE_INT_CST_LOW (t
);
3851 /* Return the most significant bit of the integer constant T. */
3854 tree_int_cst_msb (tree t
)
3858 unsigned HOST_WIDE_INT l
;
3860 /* Note that using TYPE_PRECISION here is wrong. We care about the
3861 actual bits, not the (arbitrary) range of the type. */
3862 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t
))) - 1;
3863 rshift_double (TREE_INT_CST_LOW (t
), TREE_INT_CST_HIGH (t
), prec
,
3864 2 * HOST_BITS_PER_WIDE_INT
, &l
, &h
, 0);
3865 return (l
& 1) == 1;
3868 /* Return an indication of the sign of the integer constant T.
3869 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
3870 Note that -1 will never be returned it T's type is unsigned. */
3873 tree_int_cst_sgn (tree t
)
3875 if (TREE_INT_CST_LOW (t
) == 0 && TREE_INT_CST_HIGH (t
) == 0)
3877 else if (TYPE_UNSIGNED (TREE_TYPE (t
)))
3879 else if (TREE_INT_CST_HIGH (t
) < 0)
3885 /* Compare two constructor-element-type constants. Return 1 if the lists
3886 are known to be equal; otherwise return 0. */
3889 simple_cst_list_equal (tree l1
, tree l2
)
3891 while (l1
!= NULL_TREE
&& l2
!= NULL_TREE
)
3893 if (simple_cst_equal (TREE_VALUE (l1
), TREE_VALUE (l2
)) != 1)
3896 l1
= TREE_CHAIN (l1
);
3897 l2
= TREE_CHAIN (l2
);
3903 /* Return truthvalue of whether T1 is the same tree structure as T2.
3904 Return 1 if they are the same.
3905 Return 0 if they are understandably different.
3906 Return -1 if either contains tree structure not understood by
3910 simple_cst_equal (tree t1
, tree t2
)
3912 enum tree_code code1
, code2
;
3918 if (t1
== 0 || t2
== 0)
3921 code1
= TREE_CODE (t1
);
3922 code2
= TREE_CODE (t2
);
3924 if (code1
== NOP_EXPR
|| code1
== CONVERT_EXPR
|| code1
== NON_LVALUE_EXPR
)
3926 if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
3927 || code2
== NON_LVALUE_EXPR
)
3928 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3930 return simple_cst_equal (TREE_OPERAND (t1
, 0), t2
);
3933 else if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
3934 || code2
== NON_LVALUE_EXPR
)
3935 return simple_cst_equal (t1
, TREE_OPERAND (t2
, 0));
3943 return (TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
3944 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
));
3947 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3950 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3951 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3952 TREE_STRING_LENGTH (t1
)));
3955 return simple_cst_list_equal (CONSTRUCTOR_ELTS (t1
),
3956 CONSTRUCTOR_ELTS (t2
));
3959 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3962 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3966 simple_cst_list_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
3969 /* Special case: if either target is an unallocated VAR_DECL,
3970 it means that it's going to be unified with whatever the
3971 TARGET_EXPR is really supposed to initialize, so treat it
3972 as being equivalent to anything. */
3973 if ((TREE_CODE (TREE_OPERAND (t1
, 0)) == VAR_DECL
3974 && DECL_NAME (TREE_OPERAND (t1
, 0)) == NULL_TREE
3975 && !DECL_RTL_SET_P (TREE_OPERAND (t1
, 0)))
3976 || (TREE_CODE (TREE_OPERAND (t2
, 0)) == VAR_DECL
3977 && DECL_NAME (TREE_OPERAND (t2
, 0)) == NULL_TREE
3978 && !DECL_RTL_SET_P (TREE_OPERAND (t2
, 0))))
3981 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3986 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
3988 case WITH_CLEANUP_EXPR
:
3989 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3993 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t1
, 1));
3996 if (TREE_OPERAND (t1
, 1) == TREE_OPERAND (t2
, 1))
3997 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
4011 /* This general rule works for most tree codes. All exceptions should be
4012 handled above. If this is a language-specific tree code, we can't
4013 trust what might be in the operand, so say we don't know
4015 if ((int) code1
>= (int) LAST_AND_UNUSED_TREE_CODE
)
4018 switch (TREE_CODE_CLASS (code1
))
4022 case tcc_comparison
:
4023 case tcc_expression
:
4027 for (i
= 0; i
< TREE_CODE_LENGTH (code1
); i
++)
4029 cmp
= simple_cst_equal (TREE_OPERAND (t1
, i
), TREE_OPERAND (t2
, i
));
4041 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
4042 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
4043 than U, respectively. */
4046 compare_tree_int (tree t
, unsigned HOST_WIDE_INT u
)
4048 if (tree_int_cst_sgn (t
) < 0)
4050 else if (TREE_INT_CST_HIGH (t
) != 0)
4052 else if (TREE_INT_CST_LOW (t
) == u
)
4054 else if (TREE_INT_CST_LOW (t
) < u
)
4060 /* Return true if CODE represents an associative tree code. Otherwise
4063 associative_tree_code (enum tree_code code
)
4082 /* Return true if CODE represents a commutative tree code. Otherwise
4085 commutative_tree_code (enum tree_code code
)
4098 case UNORDERED_EXPR
:
4102 case TRUTH_AND_EXPR
:
4103 case TRUTH_XOR_EXPR
:
4113 /* Generate a hash value for an expression. This can be used iteratively
4114 by passing a previous result as the "val" argument.
4116 This function is intended to produce the same hash for expressions which
4117 would compare equal using operand_equal_p. */
4120 iterative_hash_expr (tree t
, hashval_t val
)
4123 enum tree_code code
;
4127 return iterative_hash_pointer (t
, val
);
4129 code
= TREE_CODE (t
);
4133 /* Alas, constants aren't shared, so we can't rely on pointer
4136 val
= iterative_hash_host_wide_int (TREE_INT_CST_LOW (t
), val
);
4137 return iterative_hash_host_wide_int (TREE_INT_CST_HIGH (t
), val
);
4140 unsigned int val2
= real_hash (TREE_REAL_CST_PTR (t
));
4142 return iterative_hash_hashval_t (val2
, val
);
4145 return iterative_hash (TREE_STRING_POINTER (t
),
4146 TREE_STRING_LENGTH (t
), val
);
4148 val
= iterative_hash_expr (TREE_REALPART (t
), val
);
4149 return iterative_hash_expr (TREE_IMAGPART (t
), val
);
4151 return iterative_hash_expr (TREE_VECTOR_CST_ELTS (t
), val
);
4155 /* we can just compare by pointer. */
4156 return iterative_hash_pointer (t
, val
);
4159 /* A list of expressions, for a CALL_EXPR or as the elements of a
4161 for (; t
; t
= TREE_CHAIN (t
))
4162 val
= iterative_hash_expr (TREE_VALUE (t
), val
);
4165 /* When referring to a built-in FUNCTION_DECL, use the
4166 __builtin__ form. Otherwise nodes that compare equal
4167 according to operand_equal_p might get different
4169 if (DECL_BUILT_IN (t
))
4171 val
= iterative_hash_pointer (built_in_decls
[DECL_FUNCTION_CODE (t
)],
4175 /* else FALL THROUGH */
4177 class = TREE_CODE_CLASS (code
);
4179 if (class == tcc_declaration
)
4181 /* Otherwise, we can just compare decls by pointer. */
4182 val
= iterative_hash_pointer (t
, val
);
4186 gcc_assert (IS_EXPR_CODE_CLASS (class));
4188 val
= iterative_hash_object (code
, val
);
4190 /* Don't hash the type, that can lead to having nodes which
4191 compare equal according to operand_equal_p, but which
4192 have different hash codes. */
4193 if (code
== NOP_EXPR
4194 || code
== CONVERT_EXPR
4195 || code
== NON_LVALUE_EXPR
)
4197 /* Make sure to include signness in the hash computation. */
4198 val
+= TYPE_UNSIGNED (TREE_TYPE (t
));
4199 val
= iterative_hash_expr (TREE_OPERAND (t
, 0), val
);
4202 else if (commutative_tree_code (code
))
4204 /* It's a commutative expression. We want to hash it the same
4205 however it appears. We do this by first hashing both operands
4206 and then rehashing based on the order of their independent
4208 hashval_t one
= iterative_hash_expr (TREE_OPERAND (t
, 0), 0);
4209 hashval_t two
= iterative_hash_expr (TREE_OPERAND (t
, 1), 0);
4213 t
= one
, one
= two
, two
= t
;
4215 val
= iterative_hash_hashval_t (one
, val
);
4216 val
= iterative_hash_hashval_t (two
, val
);
4219 for (i
= TREE_CODE_LENGTH (code
) - 1; i
>= 0; --i
)
4220 val
= iterative_hash_expr (TREE_OPERAND (t
, i
), val
);
4227 /* Constructors for pointer, array and function types.
4228 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
4229 constructed by language-dependent code, not here.) */
4231 /* Construct, lay out and return the type of pointers to TO_TYPE with
4232 mode MODE. If CAN_ALIAS_ALL is TRUE, indicate this type can
4233 reference all of memory. If such a type has already been
4234 constructed, reuse it. */
4237 build_pointer_type_for_mode (tree to_type
, enum machine_mode mode
,
4242 /* In some cases, languages will have things that aren't a POINTER_TYPE
4243 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_POINTER_TO.
4244 In that case, return that type without regard to the rest of our
4247 ??? This is a kludge, but consistent with the way this function has
4248 always operated and there doesn't seem to be a good way to avoid this
4250 if (TYPE_POINTER_TO (to_type
) != 0
4251 && TREE_CODE (TYPE_POINTER_TO (to_type
)) != POINTER_TYPE
)
4252 return TYPE_POINTER_TO (to_type
);
4254 /* First, if we already have a type for pointers to TO_TYPE and it's
4255 the proper mode, use it. */
4256 for (t
= TYPE_POINTER_TO (to_type
); t
; t
= TYPE_NEXT_PTR_TO (t
))
4257 if (TYPE_MODE (t
) == mode
&& TYPE_REF_CAN_ALIAS_ALL (t
) == can_alias_all
)
4260 t
= make_node (POINTER_TYPE
);
4262 TREE_TYPE (t
) = to_type
;
4263 TYPE_MODE (t
) = mode
;
4264 TYPE_REF_CAN_ALIAS_ALL (t
) = can_alias_all
;
4265 TYPE_NEXT_PTR_TO (t
) = TYPE_POINTER_TO (to_type
);
4266 TYPE_POINTER_TO (to_type
) = t
;
4268 /* Lay out the type. This function has many callers that are concerned
4269 with expression-construction, and this simplifies them all. */
4275 /* By default build pointers in ptr_mode. */
4278 build_pointer_type (tree to_type
)
4280 return build_pointer_type_for_mode (to_type
, ptr_mode
, false);
4283 /* Same as build_pointer_type_for_mode, but for REFERENCE_TYPE. */
4286 build_reference_type_for_mode (tree to_type
, enum machine_mode mode
,
4291 /* In some cases, languages will have things that aren't a REFERENCE_TYPE
4292 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_REFERENCE_TO.
4293 In that case, return that type without regard to the rest of our
4296 ??? This is a kludge, but consistent with the way this function has
4297 always operated and there doesn't seem to be a good way to avoid this
4299 if (TYPE_REFERENCE_TO (to_type
) != 0
4300 && TREE_CODE (TYPE_REFERENCE_TO (to_type
)) != REFERENCE_TYPE
)
4301 return TYPE_REFERENCE_TO (to_type
);
4303 /* First, if we already have a type for pointers to TO_TYPE and it's
4304 the proper mode, use it. */
4305 for (t
= TYPE_REFERENCE_TO (to_type
); t
; t
= TYPE_NEXT_REF_TO (t
))
4306 if (TYPE_MODE (t
) == mode
&& TYPE_REF_CAN_ALIAS_ALL (t
) == can_alias_all
)
4309 t
= make_node (REFERENCE_TYPE
);
4311 TREE_TYPE (t
) = to_type
;
4312 TYPE_MODE (t
) = mode
;
4313 TYPE_REF_CAN_ALIAS_ALL (t
) = can_alias_all
;
4314 TYPE_NEXT_REF_TO (t
) = TYPE_REFERENCE_TO (to_type
);
4315 TYPE_REFERENCE_TO (to_type
) = t
;
4323 /* Build the node for the type of references-to-TO_TYPE by default
4327 build_reference_type (tree to_type
)
4329 return build_reference_type_for_mode (to_type
, ptr_mode
, false);
4332 /* Build a type that is compatible with t but has no cv quals anywhere
4335 const char *const *const * -> char ***. */
4338 build_type_no_quals (tree t
)
4340 switch (TREE_CODE (t
))
4343 return build_pointer_type_for_mode (build_type_no_quals (TREE_TYPE (t
)),
4345 TYPE_REF_CAN_ALIAS_ALL (t
));
4346 case REFERENCE_TYPE
:
4348 build_reference_type_for_mode (build_type_no_quals (TREE_TYPE (t
)),
4350 TYPE_REF_CAN_ALIAS_ALL (t
));
4352 return TYPE_MAIN_VARIANT (t
);
4356 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
4357 MAXVAL should be the maximum value in the domain
4358 (one less than the length of the array).
4360 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
4361 We don't enforce this limit, that is up to caller (e.g. language front end).
4362 The limit exists because the result is a signed type and we don't handle
4363 sizes that use more than one HOST_WIDE_INT. */
4366 build_index_type (tree maxval
)
4368 tree itype
= make_node (INTEGER_TYPE
);
4370 TREE_TYPE (itype
) = sizetype
;
4371 TYPE_PRECISION (itype
) = TYPE_PRECISION (sizetype
);
4372 TYPE_MIN_VALUE (itype
) = size_zero_node
;
4373 TYPE_MAX_VALUE (itype
) = fold_convert (sizetype
, maxval
);
4374 TYPE_MODE (itype
) = TYPE_MODE (sizetype
);
4375 TYPE_SIZE (itype
) = TYPE_SIZE (sizetype
);
4376 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (sizetype
);
4377 TYPE_ALIGN (itype
) = TYPE_ALIGN (sizetype
);
4378 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (sizetype
);
4380 if (host_integerp (maxval
, 1))
4381 return type_hash_canon (tree_low_cst (maxval
, 1), itype
);
4386 /* Builds a signed or unsigned integer type of precision PRECISION.
4387 Used for C bitfields whose precision does not match that of
4388 built-in target types. */
4390 build_nonstandard_integer_type (unsigned HOST_WIDE_INT precision
,
4393 tree itype
= make_node (INTEGER_TYPE
);
4395 TYPE_PRECISION (itype
) = precision
;
4398 fixup_unsigned_type (itype
);
4400 fixup_signed_type (itype
);
4402 if (host_integerp (TYPE_MAX_VALUE (itype
), 1))
4403 return type_hash_canon (tree_low_cst (TYPE_MAX_VALUE (itype
), 1), itype
);
4408 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
4409 ENUMERAL_TYPE, BOOLEAN_TYPE, or CHAR_TYPE), with
4410 low bound LOWVAL and high bound HIGHVAL.
4411 if TYPE==NULL_TREE, sizetype is used. */
4414 build_range_type (tree type
, tree lowval
, tree highval
)
4416 tree itype
= make_node (INTEGER_TYPE
);
4418 TREE_TYPE (itype
) = type
;
4419 if (type
== NULL_TREE
)
4422 TYPE_MIN_VALUE (itype
) = convert (type
, lowval
);
4423 TYPE_MAX_VALUE (itype
) = highval
? convert (type
, highval
) : NULL
;
4425 TYPE_PRECISION (itype
) = TYPE_PRECISION (type
);
4426 TYPE_MODE (itype
) = TYPE_MODE (type
);
4427 TYPE_SIZE (itype
) = TYPE_SIZE (type
);
4428 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (type
);
4429 TYPE_ALIGN (itype
) = TYPE_ALIGN (type
);
4430 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (type
);
4432 if (host_integerp (lowval
, 0) && highval
!= 0 && host_integerp (highval
, 0))
4433 return type_hash_canon (tree_low_cst (highval
, 0)
4434 - tree_low_cst (lowval
, 0),
4440 /* Just like build_index_type, but takes lowval and highval instead
4441 of just highval (maxval). */
4444 build_index_2_type (tree lowval
, tree highval
)
4446 return build_range_type (sizetype
, lowval
, highval
);
4449 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
4450 and number of elements specified by the range of values of INDEX_TYPE.
4451 If such a type has already been constructed, reuse it. */
4454 build_array_type (tree elt_type
, tree index_type
)
4457 hashval_t hashcode
= 0;
4459 if (TREE_CODE (elt_type
) == FUNCTION_TYPE
)
4461 error ("arrays of functions are not meaningful");
4462 elt_type
= integer_type_node
;
4465 t
= make_node (ARRAY_TYPE
);
4466 TREE_TYPE (t
) = elt_type
;
4467 TYPE_DOMAIN (t
) = index_type
;
4469 if (index_type
== 0)
4475 hashcode
= iterative_hash_object (TYPE_HASH (elt_type
), hashcode
);
4476 hashcode
= iterative_hash_object (TYPE_HASH (index_type
), hashcode
);
4477 t
= type_hash_canon (hashcode
, t
);
4479 if (!COMPLETE_TYPE_P (t
))
4484 /* Return the TYPE of the elements comprising
4485 the innermost dimension of ARRAY. */
4488 get_inner_array_type (tree array
)
4490 tree type
= TREE_TYPE (array
);
4492 while (TREE_CODE (type
) == ARRAY_TYPE
)
4493 type
= TREE_TYPE (type
);
4498 /* Construct, lay out and return
4499 the type of functions returning type VALUE_TYPE
4500 given arguments of types ARG_TYPES.
4501 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
4502 are data type nodes for the arguments of the function.
4503 If such a type has already been constructed, reuse it. */
4506 build_function_type (tree value_type
, tree arg_types
)
4509 hashval_t hashcode
= 0;
4511 if (TREE_CODE (value_type
) == FUNCTION_TYPE
)
4513 error ("function return type cannot be function");
4514 value_type
= integer_type_node
;
4517 /* Make a node of the sort we want. */
4518 t
= make_node (FUNCTION_TYPE
);
4519 TREE_TYPE (t
) = value_type
;
4520 TYPE_ARG_TYPES (t
) = arg_types
;
4522 /* If we already have such a type, use the old one. */
4523 hashcode
= iterative_hash_object (TYPE_HASH (value_type
), hashcode
);
4524 hashcode
= type_hash_list (arg_types
, hashcode
);
4525 t
= type_hash_canon (hashcode
, t
);
4527 if (!COMPLETE_TYPE_P (t
))
4532 /* Build a function type. The RETURN_TYPE is the type returned by the
4533 function. If additional arguments are provided, they are
4534 additional argument types. The list of argument types must always
4535 be terminated by NULL_TREE. */
4538 build_function_type_list (tree return_type
, ...)
4543 va_start (p
, return_type
);
4545 t
= va_arg (p
, tree
);
4546 for (args
= NULL_TREE
; t
!= NULL_TREE
; t
= va_arg (p
, tree
))
4547 args
= tree_cons (NULL_TREE
, t
, args
);
4549 if (args
== NULL_TREE
)
4550 args
= void_list_node
;
4554 args
= nreverse (args
);
4555 TREE_CHAIN (last
) = void_list_node
;
4557 args
= build_function_type (return_type
, args
);
4563 /* Build a METHOD_TYPE for a member of BASETYPE. The RETTYPE (a TYPE)
4564 and ARGTYPES (a TREE_LIST) are the return type and arguments types
4565 for the method. An implicit additional parameter (of type
4566 pointer-to-BASETYPE) is added to the ARGTYPES. */
4569 build_method_type_directly (tree basetype
,
4577 /* Make a node of the sort we want. */
4578 t
= make_node (METHOD_TYPE
);
4580 TYPE_METHOD_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
4581 TREE_TYPE (t
) = rettype
;
4582 ptype
= build_pointer_type (basetype
);
4584 /* The actual arglist for this function includes a "hidden" argument
4585 which is "this". Put it into the list of argument types. */
4586 argtypes
= tree_cons (NULL_TREE
, ptype
, argtypes
);
4587 TYPE_ARG_TYPES (t
) = argtypes
;
4589 /* If we already have such a type, use the old one. */
4590 hashcode
= iterative_hash_object (TYPE_HASH (basetype
), hashcode
);
4591 hashcode
= iterative_hash_object (TYPE_HASH (rettype
), hashcode
);
4592 hashcode
= type_hash_list (argtypes
, hashcode
);
4593 t
= type_hash_canon (hashcode
, t
);
4595 if (!COMPLETE_TYPE_P (t
))
4601 /* Construct, lay out and return the type of methods belonging to class
4602 BASETYPE and whose arguments and values are described by TYPE.
4603 If that type exists already, reuse it.
4604 TYPE must be a FUNCTION_TYPE node. */
4607 build_method_type (tree basetype
, tree type
)
4609 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
4611 return build_method_type_directly (basetype
,
4613 TYPE_ARG_TYPES (type
));
4616 /* Construct, lay out and return the type of offsets to a value
4617 of type TYPE, within an object of type BASETYPE.
4618 If a suitable offset type exists already, reuse it. */
4621 build_offset_type (tree basetype
, tree type
)
4624 hashval_t hashcode
= 0;
4626 /* Make a node of the sort we want. */
4627 t
= make_node (OFFSET_TYPE
);
4629 TYPE_OFFSET_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
4630 TREE_TYPE (t
) = type
;
4632 /* If we already have such a type, use the old one. */
4633 hashcode
= iterative_hash_object (TYPE_HASH (basetype
), hashcode
);
4634 hashcode
= iterative_hash_object (TYPE_HASH (type
), hashcode
);
4635 t
= type_hash_canon (hashcode
, t
);
4637 if (!COMPLETE_TYPE_P (t
))
4643 /* Create a complex type whose components are COMPONENT_TYPE. */
4646 build_complex_type (tree component_type
)
4651 /* Make a node of the sort we want. */
4652 t
= make_node (COMPLEX_TYPE
);
4654 TREE_TYPE (t
) = TYPE_MAIN_VARIANT (component_type
);
4656 /* If we already have such a type, use the old one. */
4657 hashcode
= iterative_hash_object (TYPE_HASH (component_type
), 0);
4658 t
= type_hash_canon (hashcode
, t
);
4660 if (!COMPLETE_TYPE_P (t
))
4663 /* If we are writing Dwarf2 output we need to create a name,
4664 since complex is a fundamental type. */
4665 if ((write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
4669 if (component_type
== char_type_node
)
4670 name
= "complex char";
4671 else if (component_type
== signed_char_type_node
)
4672 name
= "complex signed char";
4673 else if (component_type
== unsigned_char_type_node
)
4674 name
= "complex unsigned char";
4675 else if (component_type
== short_integer_type_node
)
4676 name
= "complex short int";
4677 else if (component_type
== short_unsigned_type_node
)
4678 name
= "complex short unsigned int";
4679 else if (component_type
== integer_type_node
)
4680 name
= "complex int";
4681 else if (component_type
== unsigned_type_node
)
4682 name
= "complex unsigned int";
4683 else if (component_type
== long_integer_type_node
)
4684 name
= "complex long int";
4685 else if (component_type
== long_unsigned_type_node
)
4686 name
= "complex long unsigned int";
4687 else if (component_type
== long_long_integer_type_node
)
4688 name
= "complex long long int";
4689 else if (component_type
== long_long_unsigned_type_node
)
4690 name
= "complex long long unsigned int";
4695 TYPE_NAME (t
) = get_identifier (name
);
4698 return build_qualified_type (t
, TYPE_QUALS (component_type
));
4701 /* Return OP, stripped of any conversions to wider types as much as is safe.
4702 Converting the value back to OP's type makes a value equivalent to OP.
4704 If FOR_TYPE is nonzero, we return a value which, if converted to
4705 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
4707 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
4708 narrowest type that can hold the value, even if they don't exactly fit.
4709 Otherwise, bit-field references are changed to a narrower type
4710 only if they can be fetched directly from memory in that type.
4712 OP must have integer, real or enumeral type. Pointers are not allowed!
4714 There are some cases where the obvious value we could return
4715 would regenerate to OP if converted to OP's type,
4716 but would not extend like OP to wider types.
4717 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
4718 For example, if OP is (unsigned short)(signed char)-1,
4719 we avoid returning (signed char)-1 if FOR_TYPE is int,
4720 even though extending that to an unsigned short would regenerate OP,
4721 since the result of extending (signed char)-1 to (int)
4722 is different from (int) OP. */
4725 get_unwidened (tree op
, tree for_type
)
4727 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
4728 tree type
= TREE_TYPE (op
);
4730 = TYPE_PRECISION (for_type
!= 0 ? for_type
: type
);
4732 = (for_type
!= 0 && for_type
!= type
4733 && final_prec
> TYPE_PRECISION (type
)
4734 && TYPE_UNSIGNED (type
));
4737 while (TREE_CODE (op
) == NOP_EXPR
4738 || TREE_CODE (op
) == CONVERT_EXPR
)
4741 = TYPE_PRECISION (TREE_TYPE (op
))
4742 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0)));
4744 /* Truncations are many-one so cannot be removed.
4745 Unless we are later going to truncate down even farther. */
4747 && final_prec
> TYPE_PRECISION (TREE_TYPE (op
)))
4750 /* See what's inside this conversion. If we decide to strip it,
4752 op
= TREE_OPERAND (op
, 0);
4754 /* If we have not stripped any zero-extensions (uns is 0),
4755 we can strip any kind of extension.
4756 If we have previously stripped a zero-extension,
4757 only zero-extensions can safely be stripped.
4758 Any extension can be stripped if the bits it would produce
4759 are all going to be discarded later by truncating to FOR_TYPE. */
4763 if (! uns
|| final_prec
<= TYPE_PRECISION (TREE_TYPE (op
)))
4765 /* TYPE_UNSIGNED says whether this is a zero-extension.
4766 Let's avoid computing it if it does not affect WIN
4767 and if UNS will not be needed again. */
4769 || TREE_CODE (op
) == NOP_EXPR
4770 || TREE_CODE (op
) == CONVERT_EXPR
)
4771 && TYPE_UNSIGNED (TREE_TYPE (op
)))
4779 if (TREE_CODE (op
) == COMPONENT_REF
4780 /* Since type_for_size always gives an integer type. */
4781 && TREE_CODE (type
) != REAL_TYPE
4782 /* Don't crash if field not laid out yet. */
4783 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
4784 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
4786 unsigned int innerprec
4787 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
4788 int unsignedp
= (DECL_UNSIGNED (TREE_OPERAND (op
, 1))
4789 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op
, 1))));
4790 type
= lang_hooks
.types
.type_for_size (innerprec
, unsignedp
);
4792 /* We can get this structure field in the narrowest type it fits in.
4793 If FOR_TYPE is 0, do this only for a field that matches the
4794 narrower type exactly and is aligned for it
4795 The resulting extension to its nominal type (a fullword type)
4796 must fit the same conditions as for other extensions. */
4799 && INT_CST_LT_UNSIGNED (TYPE_SIZE (type
), TYPE_SIZE (TREE_TYPE (op
)))
4800 && (for_type
|| ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1)))
4801 && (! uns
|| final_prec
<= innerprec
|| unsignedp
))
4803 win
= build3 (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
4804 TREE_OPERAND (op
, 1), NULL_TREE
);
4805 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
4806 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
4813 /* Return OP or a simpler expression for a narrower value
4814 which can be sign-extended or zero-extended to give back OP.
4815 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
4816 or 0 if the value should be sign-extended. */
4819 get_narrower (tree op
, int *unsignedp_ptr
)
4824 bool integral_p
= INTEGRAL_TYPE_P (TREE_TYPE (op
));
4826 while (TREE_CODE (op
) == NOP_EXPR
)
4829 = (TYPE_PRECISION (TREE_TYPE (op
))
4830 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0))));
4832 /* Truncations are many-one so cannot be removed. */
4836 /* See what's inside this conversion. If we decide to strip it,
4841 op
= TREE_OPERAND (op
, 0);
4842 /* An extension: the outermost one can be stripped,
4843 but remember whether it is zero or sign extension. */
4845 uns
= TYPE_UNSIGNED (TREE_TYPE (op
));
4846 /* Otherwise, if a sign extension has been stripped,
4847 only sign extensions can now be stripped;
4848 if a zero extension has been stripped, only zero-extensions. */
4849 else if (uns
!= TYPE_UNSIGNED (TREE_TYPE (op
)))
4853 else /* bitschange == 0 */
4855 /* A change in nominal type can always be stripped, but we must
4856 preserve the unsignedness. */
4858 uns
= TYPE_UNSIGNED (TREE_TYPE (op
));
4860 op
= TREE_OPERAND (op
, 0);
4861 /* Keep trying to narrow, but don't assign op to win if it
4862 would turn an integral type into something else. */
4863 if (INTEGRAL_TYPE_P (TREE_TYPE (op
)) != integral_p
)
4870 if (TREE_CODE (op
) == COMPONENT_REF
4871 /* Since type_for_size always gives an integer type. */
4872 && TREE_CODE (TREE_TYPE (op
)) != REAL_TYPE
4873 /* Ensure field is laid out already. */
4874 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
4875 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
4877 unsigned HOST_WIDE_INT innerprec
4878 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
4879 int unsignedp
= (DECL_UNSIGNED (TREE_OPERAND (op
, 1))
4880 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op
, 1))));
4881 tree type
= lang_hooks
.types
.type_for_size (innerprec
, unsignedp
);
4883 /* We can get this structure field in a narrower type that fits it,
4884 but the resulting extension to its nominal type (a fullword type)
4885 must satisfy the same conditions as for other extensions.
4887 Do this only for fields that are aligned (not bit-fields),
4888 because when bit-field insns will be used there is no
4889 advantage in doing this. */
4891 if (innerprec
< TYPE_PRECISION (TREE_TYPE (op
))
4892 && ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1))
4893 && (first
|| uns
== DECL_UNSIGNED (TREE_OPERAND (op
, 1)))
4897 uns
= DECL_UNSIGNED (TREE_OPERAND (op
, 1));
4898 win
= build3 (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
4899 TREE_OPERAND (op
, 1), NULL_TREE
);
4900 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
4901 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
4904 *unsignedp_ptr
= uns
;
4908 /* Nonzero if integer constant C has a value that is permissible
4909 for type TYPE (an INTEGER_TYPE). */
4912 int_fits_type_p (tree c
, tree type
)
4914 tree type_low_bound
= TYPE_MIN_VALUE (type
);
4915 tree type_high_bound
= TYPE_MAX_VALUE (type
);
4916 bool ok_for_low_bound
, ok_for_high_bound
;
4919 /* If at least one bound of the type is a constant integer, we can check
4920 ourselves and maybe make a decision. If no such decision is possible, but
4921 this type is a subtype, try checking against that. Otherwise, use
4922 force_fit_type, which checks against the precision.
4924 Compute the status for each possibly constant bound, and return if we see
4925 one does not match. Use ok_for_xxx_bound for this purpose, assigning -1
4926 for "unknown if constant fits", 0 for "constant known *not* to fit" and 1
4927 for "constant known to fit". */
4929 /* Check if C >= type_low_bound. */
4930 if (type_low_bound
&& TREE_CODE (type_low_bound
) == INTEGER_CST
)
4932 if (tree_int_cst_lt (c
, type_low_bound
))
4934 ok_for_low_bound
= true;
4937 ok_for_low_bound
= false;
4939 /* Check if c <= type_high_bound. */
4940 if (type_high_bound
&& TREE_CODE (type_high_bound
) == INTEGER_CST
)
4942 if (tree_int_cst_lt (type_high_bound
, c
))
4944 ok_for_high_bound
= true;
4947 ok_for_high_bound
= false;
4949 /* If the constant fits both bounds, the result is known. */
4950 if (ok_for_low_bound
&& ok_for_high_bound
)
4953 /* Perform some generic filtering which may allow making a decision
4954 even if the bounds are not constant. First, negative integers
4955 never fit in unsigned types, */
4956 if (TYPE_UNSIGNED (type
) && tree_int_cst_sgn (c
) < 0)
4959 /* Second, narrower types always fit in wider ones. */
4960 if (TYPE_PRECISION (type
) > TYPE_PRECISION (TREE_TYPE (c
)))
4963 /* Third, unsigned integers with top bit set never fit signed types. */
4964 if (! TYPE_UNSIGNED (type
)
4965 && TYPE_UNSIGNED (TREE_TYPE (c
))
4966 && tree_int_cst_msb (c
))
4969 /* If we haven't been able to decide at this point, there nothing more we
4970 can check ourselves here. Look at the base type if we have one. */
4971 if (TREE_CODE (type
) == INTEGER_TYPE
&& TREE_TYPE (type
) != 0)
4972 return int_fits_type_p (c
, TREE_TYPE (type
));
4974 /* Or to force_fit_type, if nothing else. */
4975 tmp
= copy_node (c
);
4976 TREE_TYPE (tmp
) = type
;
4977 tmp
= force_fit_type (tmp
, -1, false, false);
4978 return TREE_INT_CST_HIGH (tmp
) == TREE_INT_CST_HIGH (c
)
4979 && TREE_INT_CST_LOW (tmp
) == TREE_INT_CST_LOW (c
);
4982 /* Subprogram of following function. Called by walk_tree.
4984 Return *TP if it is an automatic variable or parameter of the
4985 function passed in as DATA. */
4988 find_var_from_fn (tree
*tp
, int *walk_subtrees
, void *data
)
4990 tree fn
= (tree
) data
;
4995 else if (DECL_P (*tp
)
4996 && lang_hooks
.tree_inlining
.auto_var_in_fn_p (*tp
, fn
))
5002 /* Returns true if T is, contains, or refers to a type with variable
5003 size. If FN is nonzero, only return true if a modifier of the type
5004 or position of FN is a variable or parameter inside FN.
5006 This concept is more general than that of C99 'variably modified types':
5007 in C99, a struct type is never variably modified because a VLA may not
5008 appear as a structure member. However, in GNU C code like:
5010 struct S { int i[f()]; };
5012 is valid, and other languages may define similar constructs. */
5015 variably_modified_type_p (tree type
, tree fn
)
5019 /* Test if T is either variable (if FN is zero) or an expression containing
5020 a variable in FN. */
5021 #define RETURN_TRUE_IF_VAR(T) \
5022 do { tree _t = (T); \
5023 if (_t && _t != error_mark_node && TREE_CODE (_t) != INTEGER_CST \
5024 && (!fn || walk_tree (&_t, find_var_from_fn, fn, NULL))) \
5025 return true; } while (0)
5027 if (type
== error_mark_node
)
5030 /* If TYPE itself has variable size, it is variably modified.
5032 We do not yet have a representation of the C99 '[*]' syntax.
5033 When a representation is chosen, this function should be modified
5034 to test for that case as well. */
5035 RETURN_TRUE_IF_VAR (TYPE_SIZE (type
));
5036 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT(type
));
5038 switch (TREE_CODE (type
))
5041 case REFERENCE_TYPE
:
5044 if (variably_modified_type_p (TREE_TYPE (type
), fn
))
5050 /* If TYPE is a function type, it is variably modified if any of the
5051 parameters or the return type are variably modified. */
5052 if (variably_modified_type_p (TREE_TYPE (type
), fn
))
5055 for (t
= TYPE_ARG_TYPES (type
);
5056 t
&& t
!= void_list_node
;
5058 if (variably_modified_type_p (TREE_VALUE (t
), fn
))
5067 /* Scalar types are variably modified if their end points
5069 RETURN_TRUE_IF_VAR (TYPE_MIN_VALUE (type
));
5070 RETURN_TRUE_IF_VAR (TYPE_MAX_VALUE (type
));
5075 case QUAL_UNION_TYPE
:
5076 /* We can't see if any of the field are variably-modified by the
5077 definition we normally use, since that would produce infinite
5078 recursion via pointers. */
5079 /* This is variably modified if some field's type is. */
5080 for (t
= TYPE_FIELDS (type
); t
; t
= TREE_CHAIN (t
))
5081 if (TREE_CODE (t
) == FIELD_DECL
)
5083 RETURN_TRUE_IF_VAR (DECL_FIELD_OFFSET (t
));
5084 RETURN_TRUE_IF_VAR (DECL_SIZE (t
));
5085 RETURN_TRUE_IF_VAR (DECL_SIZE_UNIT (t
));
5087 if (TREE_CODE (type
) == QUAL_UNION_TYPE
)
5088 RETURN_TRUE_IF_VAR (DECL_QUALIFIER (t
));
5096 /* The current language may have other cases to check, but in general,
5097 all other types are not variably modified. */
5098 return lang_hooks
.tree_inlining
.var_mod_type_p (type
, fn
);
5100 #undef RETURN_TRUE_IF_VAR
5103 /* Given a DECL or TYPE, return the scope in which it was declared, or
5104 NULL_TREE if there is no containing scope. */
5107 get_containing_scope (tree t
)
5109 return (TYPE_P (t
) ? TYPE_CONTEXT (t
) : DECL_CONTEXT (t
));
5112 /* Return the innermost context enclosing DECL that is
5113 a FUNCTION_DECL, or zero if none. */
5116 decl_function_context (tree decl
)
5120 if (TREE_CODE (decl
) == ERROR_MARK
)
5123 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
5124 where we look up the function at runtime. Such functions always take
5125 a first argument of type 'pointer to real context'.
5127 C++ should really be fixed to use DECL_CONTEXT for the real context,
5128 and use something else for the "virtual context". */
5129 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_VINDEX (decl
))
5132 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl
)))));
5134 context
= DECL_CONTEXT (decl
);
5136 while (context
&& TREE_CODE (context
) != FUNCTION_DECL
)
5138 if (TREE_CODE (context
) == BLOCK
)
5139 context
= BLOCK_SUPERCONTEXT (context
);
5141 context
= get_containing_scope (context
);
5147 /* Return the innermost context enclosing DECL that is
5148 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
5149 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
5152 decl_type_context (tree decl
)
5154 tree context
= DECL_CONTEXT (decl
);
5157 switch (TREE_CODE (context
))
5159 case NAMESPACE_DECL
:
5160 case TRANSLATION_UNIT_DECL
:
5165 case QUAL_UNION_TYPE
:
5170 context
= DECL_CONTEXT (context
);
5174 context
= BLOCK_SUPERCONTEXT (context
);
5184 /* CALL is a CALL_EXPR. Return the declaration for the function
5185 called, or NULL_TREE if the called function cannot be
5189 get_callee_fndecl (tree call
)
5193 /* It's invalid to call this function with anything but a
5195 gcc_assert (TREE_CODE (call
) == CALL_EXPR
);
5197 /* The first operand to the CALL is the address of the function
5199 addr
= TREE_OPERAND (call
, 0);
5203 /* If this is a readonly function pointer, extract its initial value. */
5204 if (DECL_P (addr
) && TREE_CODE (addr
) != FUNCTION_DECL
5205 && TREE_READONLY (addr
) && ! TREE_THIS_VOLATILE (addr
)
5206 && DECL_INITIAL (addr
))
5207 addr
= DECL_INITIAL (addr
);
5209 /* If the address is just `&f' for some function `f', then we know
5210 that `f' is being called. */
5211 if (TREE_CODE (addr
) == ADDR_EXPR
5212 && TREE_CODE (TREE_OPERAND (addr
, 0)) == FUNCTION_DECL
)
5213 return TREE_OPERAND (addr
, 0);
5215 /* We couldn't figure out what was being called. Maybe the front
5216 end has some idea. */
5217 return lang_hooks
.lang_get_callee_fndecl (call
);
5220 /* Print debugging information about tree nodes generated during the compile,
5221 and any language-specific information. */
5224 dump_tree_statistics (void)
5226 #ifdef GATHER_STATISTICS
5228 int total_nodes
, total_bytes
;
5231 fprintf (stderr
, "\n??? tree nodes created\n\n");
5232 #ifdef GATHER_STATISTICS
5233 fprintf (stderr
, "Kind Nodes Bytes\n");
5234 fprintf (stderr
, "---------------------------------------\n");
5235 total_nodes
= total_bytes
= 0;
5236 for (i
= 0; i
< (int) all_kinds
; i
++)
5238 fprintf (stderr
, "%-20s %7d %10d\n", tree_node_kind_names
[i
],
5239 tree_node_counts
[i
], tree_node_sizes
[i
]);
5240 total_nodes
+= tree_node_counts
[i
];
5241 total_bytes
+= tree_node_sizes
[i
];
5243 fprintf (stderr
, "---------------------------------------\n");
5244 fprintf (stderr
, "%-20s %7d %10d\n", "Total", total_nodes
, total_bytes
);
5245 fprintf (stderr
, "---------------------------------------\n");
5246 ssanames_print_statistics ();
5247 phinodes_print_statistics ();
5249 fprintf (stderr
, "(No per-node statistics)\n");
5251 print_type_hash_statistics ();
5252 lang_hooks
.print_statistics ();
5255 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
5257 /* Generate a crc32 of a string. */
5260 crc32_string (unsigned chksum
, const char *string
)
5264 unsigned value
= *string
<< 24;
5267 for (ix
= 8; ix
--; value
<<= 1)
5271 feedback
= (value
^ chksum
) & 0x80000000 ? 0x04c11db7 : 0;
5280 /* P is a string that will be used in a symbol. Mask out any characters
5281 that are not valid in that context. */
5284 clean_symbol_name (char *p
)
5288 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
5291 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
5298 /* Generate a name for a function unique to this translation unit.
5299 TYPE is some string to identify the purpose of this function to the
5300 linker or collect2. */
5303 get_file_function_name_long (const char *type
)
5309 if (first_global_object_name
)
5310 p
= first_global_object_name
;
5313 /* We don't have anything that we know to be unique to this translation
5314 unit, so use what we do have and throw in some randomness. */
5316 const char *name
= weak_global_object_name
;
5317 const char *file
= main_input_filename
;
5322 file
= input_filename
;
5324 len
= strlen (file
);
5325 q
= alloca (9 * 2 + len
+ 1);
5326 memcpy (q
, file
, len
+ 1);
5327 clean_symbol_name (q
);
5329 sprintf (q
+ len
, "_%08X_%08X", crc32_string (0, name
),
5330 crc32_string (0, flag_random_seed
));
5335 buf
= alloca (sizeof (FILE_FUNCTION_FORMAT
) + strlen (p
) + strlen (type
));
5337 /* Set up the name of the file-level functions we may need.
5338 Use a global object (which is already required to be unique over
5339 the program) rather than the file name (which imposes extra
5341 sprintf (buf
, FILE_FUNCTION_FORMAT
, type
, p
);
5343 return get_identifier (buf
);
5346 /* If KIND=='I', return a suitable global initializer (constructor) name.
5347 If KIND=='D', return a suitable global clean-up (destructor) name. */
5350 get_file_function_name (int kind
)
5357 return get_file_function_name_long (p
);
5360 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
5362 /* Complain that the tree code of NODE does not match the expected 0
5363 terminated list of trailing codes. The trailing code list can be
5364 empty, for a more vague error message. FILE, LINE, and FUNCTION
5365 are of the caller. */
5368 tree_check_failed (const tree node
, const char *file
,
5369 int line
, const char *function
, ...)
5373 unsigned length
= 0;
5376 va_start (args
, function
);
5377 while ((code
= va_arg (args
, int)))
5378 length
+= 4 + strlen (tree_code_name
[code
]);
5382 va_start (args
, function
);
5383 length
+= strlen ("expected ");
5384 buffer
= alloca (length
);
5386 while ((code
= va_arg (args
, int)))
5388 const char *prefix
= length
? " or " : "expected ";
5390 strcpy (buffer
+ length
, prefix
);
5391 length
+= strlen (prefix
);
5392 strcpy (buffer
+ length
, tree_code_name
[code
]);
5393 length
+= strlen (tree_code_name
[code
]);
5398 buffer
= (char *)"unexpected node";
5400 internal_error ("tree check: %s, have %s in %s, at %s:%d",
5401 buffer
, tree_code_name
[TREE_CODE (node
)],
5402 function
, trim_filename (file
), line
);
5405 /* Complain that the tree code of NODE does match the expected 0
5406 terminated list of trailing codes. FILE, LINE, and FUNCTION are of
5410 tree_not_check_failed (const tree node
, const char *file
,
5411 int line
, const char *function
, ...)
5415 unsigned length
= 0;
5418 va_start (args
, function
);
5419 while ((code
= va_arg (args
, int)))
5420 length
+= 4 + strlen (tree_code_name
[code
]);
5422 va_start (args
, function
);
5423 buffer
= alloca (length
);
5425 while ((code
= va_arg (args
, int)))
5429 strcpy (buffer
+ length
, " or ");
5432 strcpy (buffer
+ length
, tree_code_name
[code
]);
5433 length
+= strlen (tree_code_name
[code
]);
5437 internal_error ("tree check: expected none of %s, have %s in %s, at %s:%d",
5438 buffer
, tree_code_name
[TREE_CODE (node
)],
5439 function
, trim_filename (file
), line
);
5442 /* Similar to tree_check_failed, except that we check for a class of tree
5443 code, given in CL. */
5446 tree_class_check_failed (const tree node
, const enum tree_code_class cl
,
5447 const char *file
, int line
, const char *function
)
5450 ("tree check: expected class %qs, have %qs (%s) in %s, at %s:%d",
5451 TREE_CODE_CLASS_STRING (cl
),
5452 TREE_CODE_CLASS_STRING (TREE_CODE_CLASS (TREE_CODE (node
))),
5453 tree_code_name
[TREE_CODE (node
)], function
, trim_filename (file
), line
);
5456 /* Similar to above, except that the check is for the bounds of a TREE_VEC's
5457 (dynamically sized) vector. */
5460 tree_vec_elt_check_failed (int idx
, int len
, const char *file
, int line
,
5461 const char *function
)
5464 ("tree check: accessed elt %d of tree_vec with %d elts in %s, at %s:%d",
5465 idx
+ 1, len
, function
, trim_filename (file
), line
);
5468 /* Similar to above, except that the check is for the bounds of a PHI_NODE's
5469 (dynamically sized) vector. */
5472 phi_node_elt_check_failed (int idx
, int len
, const char *file
, int line
,
5473 const char *function
)
5476 ("tree check: accessed elt %d of phi_node with %d elts in %s, at %s:%d",
5477 idx
+ 1, len
, function
, trim_filename (file
), line
);
5480 /* Similar to above, except that the check is for the bounds of the operand
5481 vector of an expression node. */
5484 tree_operand_check_failed (int idx
, enum tree_code code
, const char *file
,
5485 int line
, const char *function
)
5488 ("tree check: accessed operand %d of %s with %d operands in %s, at %s:%d",
5489 idx
+ 1, tree_code_name
[code
], TREE_CODE_LENGTH (code
),
5490 function
, trim_filename (file
), line
);
5492 #endif /* ENABLE_TREE_CHECKING */
5494 /* Create a new vector type node holding SUBPARTS units of type INNERTYPE,
5495 and mapped to the machine mode MODE. Initialize its fields and build
5496 the information necessary for debugging output. */
5499 make_vector_type (tree innertype
, int nunits
, enum machine_mode mode
)
5501 tree t
= make_node (VECTOR_TYPE
);
5503 TREE_TYPE (t
) = TYPE_MAIN_VARIANT (innertype
);
5504 TYPE_VECTOR_SUBPARTS (t
) = nunits
;
5505 TYPE_MODE (t
) = mode
;
5506 TYPE_READONLY (t
) = TYPE_READONLY (innertype
);
5507 TYPE_VOLATILE (t
) = TYPE_VOLATILE (innertype
);
5512 tree index
= build_int_cst (NULL_TREE
, nunits
- 1);
5513 tree array
= build_array_type (innertype
, build_index_type (index
));
5514 tree rt
= make_node (RECORD_TYPE
);
5516 TYPE_FIELDS (rt
) = build_decl (FIELD_DECL
, get_identifier ("f"), array
);
5517 DECL_CONTEXT (TYPE_FIELDS (rt
)) = rt
;
5519 TYPE_DEBUG_REPRESENTATION_TYPE (t
) = rt
;
5520 /* In dwarfout.c, type lookup uses TYPE_UID numbers. We want to output
5521 the representation type, and we want to find that die when looking up
5522 the vector type. This is most easily achieved by making the TYPE_UID
5524 TYPE_UID (rt
) = TYPE_UID (t
);
5527 /* Build our main variant, based on the main variant of the inner type. */
5528 if (TYPE_MAIN_VARIANT (innertype
) != innertype
)
5530 tree innertype_main_variant
= TYPE_MAIN_VARIANT (innertype
);
5531 unsigned int hash
= TYPE_HASH (innertype_main_variant
);
5532 TYPE_MAIN_VARIANT (t
)
5533 = type_hash_canon (hash
, make_vector_type (innertype_main_variant
,
5541 make_or_reuse_type (unsigned size
, int unsignedp
)
5543 if (size
== INT_TYPE_SIZE
)
5544 return unsignedp
? unsigned_type_node
: integer_type_node
;
5545 if (size
== CHAR_TYPE_SIZE
)
5546 return unsignedp
? unsigned_char_type_node
: signed_char_type_node
;
5547 if (size
== SHORT_TYPE_SIZE
)
5548 return unsignedp
? short_unsigned_type_node
: short_integer_type_node
;
5549 if (size
== LONG_TYPE_SIZE
)
5550 return unsignedp
? long_unsigned_type_node
: long_integer_type_node
;
5551 if (size
== LONG_LONG_TYPE_SIZE
)
5552 return (unsignedp
? long_long_unsigned_type_node
5553 : long_long_integer_type_node
);
5556 return make_unsigned_type (size
);
5558 return make_signed_type (size
);
5561 /* Create nodes for all integer types (and error_mark_node) using the sizes
5562 of C datatypes. The caller should call set_sizetype soon after calling
5563 this function to select one of the types as sizetype. */
5566 build_common_tree_nodes (bool signed_char
, bool signed_sizetype
)
5568 error_mark_node
= make_node (ERROR_MARK
);
5569 TREE_TYPE (error_mark_node
) = error_mark_node
;
5571 initialize_sizetypes (signed_sizetype
);
5573 /* Define both `signed char' and `unsigned char'. */
5574 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
5575 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
5577 /* Define `char', which is like either `signed char' or `unsigned char'
5578 but not the same as either. */
5581 ? make_signed_type (CHAR_TYPE_SIZE
)
5582 : make_unsigned_type (CHAR_TYPE_SIZE
));
5584 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
5585 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
5586 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
5587 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
5588 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
5589 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
5590 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
5591 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
5593 /* Define a boolean type. This type only represents boolean values but
5594 may be larger than char depending on the value of BOOL_TYPE_SIZE.
5595 Front ends which want to override this size (i.e. Java) can redefine
5596 boolean_type_node before calling build_common_tree_nodes_2. */
5597 boolean_type_node
= make_unsigned_type (BOOL_TYPE_SIZE
);
5598 TREE_SET_CODE (boolean_type_node
, BOOLEAN_TYPE
);
5599 TYPE_MAX_VALUE (boolean_type_node
) = build_int_cst (boolean_type_node
, 1);
5600 TYPE_PRECISION (boolean_type_node
) = 1;
5602 /* Fill in the rest of the sized types. Reuse existing type nodes
5604 intQI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (QImode
), 0);
5605 intHI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (HImode
), 0);
5606 intSI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (SImode
), 0);
5607 intDI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (DImode
), 0);
5608 intTI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (TImode
), 0);
5610 unsigned_intQI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (QImode
), 1);
5611 unsigned_intHI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (HImode
), 1);
5612 unsigned_intSI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (SImode
), 1);
5613 unsigned_intDI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (DImode
), 1);
5614 unsigned_intTI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (TImode
), 1);
5616 access_public_node
= get_identifier ("public");
5617 access_protected_node
= get_identifier ("protected");
5618 access_private_node
= get_identifier ("private");
5621 /* Call this function after calling build_common_tree_nodes and set_sizetype.
5622 It will create several other common tree nodes. */
5625 build_common_tree_nodes_2 (int short_double
)
5627 /* Define these next since types below may used them. */
5628 integer_zero_node
= build_int_cst (NULL_TREE
, 0);
5629 integer_one_node
= build_int_cst (NULL_TREE
, 1);
5630 integer_minus_one_node
= build_int_cst (NULL_TREE
, -1);
5632 size_zero_node
= size_int (0);
5633 size_one_node
= size_int (1);
5634 bitsize_zero_node
= bitsize_int (0);
5635 bitsize_one_node
= bitsize_int (1);
5636 bitsize_unit_node
= bitsize_int (BITS_PER_UNIT
);
5638 boolean_false_node
= TYPE_MIN_VALUE (boolean_type_node
);
5639 boolean_true_node
= TYPE_MAX_VALUE (boolean_type_node
);
5641 void_type_node
= make_node (VOID_TYPE
);
5642 layout_type (void_type_node
);
5644 /* We are not going to have real types in C with less than byte alignment,
5645 so we might as well not have any types that claim to have it. */
5646 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
5647 TYPE_USER_ALIGN (void_type_node
) = 0;
5649 null_pointer_node
= build_int_cst (build_pointer_type (void_type_node
), 0);
5650 layout_type (TREE_TYPE (null_pointer_node
));
5652 ptr_type_node
= build_pointer_type (void_type_node
);
5654 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
5655 fileptr_type_node
= ptr_type_node
;
5657 float_type_node
= make_node (REAL_TYPE
);
5658 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
5659 layout_type (float_type_node
);
5661 double_type_node
= make_node (REAL_TYPE
);
5663 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
5665 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
5666 layout_type (double_type_node
);
5668 long_double_type_node
= make_node (REAL_TYPE
);
5669 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
5670 layout_type (long_double_type_node
);
5672 float_ptr_type_node
= build_pointer_type (float_type_node
);
5673 double_ptr_type_node
= build_pointer_type (double_type_node
);
5674 long_double_ptr_type_node
= build_pointer_type (long_double_type_node
);
5675 integer_ptr_type_node
= build_pointer_type (integer_type_node
);
5677 complex_integer_type_node
= make_node (COMPLEX_TYPE
);
5678 TREE_TYPE (complex_integer_type_node
) = integer_type_node
;
5679 layout_type (complex_integer_type_node
);
5681 complex_float_type_node
= make_node (COMPLEX_TYPE
);
5682 TREE_TYPE (complex_float_type_node
) = float_type_node
;
5683 layout_type (complex_float_type_node
);
5685 complex_double_type_node
= make_node (COMPLEX_TYPE
);
5686 TREE_TYPE (complex_double_type_node
) = double_type_node
;
5687 layout_type (complex_double_type_node
);
5689 complex_long_double_type_node
= make_node (COMPLEX_TYPE
);
5690 TREE_TYPE (complex_long_double_type_node
) = long_double_type_node
;
5691 layout_type (complex_long_double_type_node
);
5694 tree t
= targetm
.build_builtin_va_list ();
5696 /* Many back-ends define record types without setting TYPE_NAME.
5697 If we copied the record type here, we'd keep the original
5698 record type without a name. This breaks name mangling. So,
5699 don't copy record types and let c_common_nodes_and_builtins()
5700 declare the type to be __builtin_va_list. */
5701 if (TREE_CODE (t
) != RECORD_TYPE
)
5702 t
= build_variant_type_copy (t
);
5704 va_list_type_node
= t
;
5708 /* A subroutine of build_common_builtin_nodes. Define a builtin function. */
5711 local_define_builtin (const char *name
, tree type
, enum built_in_function code
,
5712 const char *library_name
, int ecf_flags
)
5716 decl
= lang_hooks
.builtin_function (name
, type
, code
, BUILT_IN_NORMAL
,
5717 library_name
, NULL_TREE
);
5718 if (ecf_flags
& ECF_CONST
)
5719 TREE_READONLY (decl
) = 1;
5720 if (ecf_flags
& ECF_PURE
)
5721 DECL_IS_PURE (decl
) = 1;
5722 if (ecf_flags
& ECF_NORETURN
)
5723 TREE_THIS_VOLATILE (decl
) = 1;
5724 if (ecf_flags
& ECF_NOTHROW
)
5725 TREE_NOTHROW (decl
) = 1;
5726 if (ecf_flags
& ECF_MALLOC
)
5727 DECL_IS_MALLOC (decl
) = 1;
5729 built_in_decls
[code
] = decl
;
5730 implicit_built_in_decls
[code
] = decl
;
5733 /* Call this function after instantiating all builtins that the language
5734 front end cares about. This will build the rest of the builtins that
5735 are relied upon by the tree optimizers and the middle-end. */
5738 build_common_builtin_nodes (void)
5742 if (built_in_decls
[BUILT_IN_MEMCPY
] == NULL
5743 || built_in_decls
[BUILT_IN_MEMMOVE
] == NULL
)
5745 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
5746 tmp
= tree_cons (NULL_TREE
, const_ptr_type_node
, tmp
);
5747 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
5748 ftype
= build_function_type (ptr_type_node
, tmp
);
5750 if (built_in_decls
[BUILT_IN_MEMCPY
] == NULL
)
5751 local_define_builtin ("__builtin_memcpy", ftype
, BUILT_IN_MEMCPY
,
5752 "memcpy", ECF_NOTHROW
);
5753 if (built_in_decls
[BUILT_IN_MEMMOVE
] == NULL
)
5754 local_define_builtin ("__builtin_memmove", ftype
, BUILT_IN_MEMMOVE
,
5755 "memmove", ECF_NOTHROW
);
5758 if (built_in_decls
[BUILT_IN_MEMCMP
] == NULL
)
5760 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
5761 tmp
= tree_cons (NULL_TREE
, const_ptr_type_node
, tmp
);
5762 tmp
= tree_cons (NULL_TREE
, const_ptr_type_node
, tmp
);
5763 ftype
= build_function_type (ptr_type_node
, tmp
);
5764 local_define_builtin ("__builtin_memcmp", ftype
, BUILT_IN_MEMCMP
,
5765 "memcmp", ECF_PURE
| ECF_NOTHROW
);
5768 if (built_in_decls
[BUILT_IN_MEMSET
] == NULL
)
5770 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
5771 tmp
= tree_cons (NULL_TREE
, integer_type_node
, tmp
);
5772 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
5773 ftype
= build_function_type (ptr_type_node
, tmp
);
5774 local_define_builtin ("__builtin_memset", ftype
, BUILT_IN_MEMSET
,
5775 "memset", ECF_NOTHROW
);
5778 if (built_in_decls
[BUILT_IN_ALLOCA
] == NULL
)
5780 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
5781 ftype
= build_function_type (ptr_type_node
, tmp
);
5782 local_define_builtin ("__builtin_alloca", ftype
, BUILT_IN_ALLOCA
,
5783 "alloca", ECF_NOTHROW
| ECF_MALLOC
);
5786 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
5787 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
5788 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
5789 ftype
= build_function_type (void_type_node
, tmp
);
5790 local_define_builtin ("__builtin_init_trampoline", ftype
,
5791 BUILT_IN_INIT_TRAMPOLINE
,
5792 "__builtin_init_trampoline", ECF_NOTHROW
);
5794 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
5795 ftype
= build_function_type (ptr_type_node
, tmp
);
5796 local_define_builtin ("__builtin_adjust_trampoline", ftype
,
5797 BUILT_IN_ADJUST_TRAMPOLINE
,
5798 "__builtin_adjust_trampoline",
5799 ECF_CONST
| ECF_NOTHROW
);
5801 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
5802 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
5803 ftype
= build_function_type (void_type_node
, tmp
);
5804 local_define_builtin ("__builtin_nonlocal_goto", ftype
,
5805 BUILT_IN_NONLOCAL_GOTO
,
5806 "__builtin_nonlocal_goto",
5807 ECF_NORETURN
| ECF_NOTHROW
);
5809 ftype
= build_function_type (ptr_type_node
, void_list_node
);
5810 local_define_builtin ("__builtin_stack_save", ftype
, BUILT_IN_STACK_SAVE
,
5811 "__builtin_stack_save", ECF_NOTHROW
);
5813 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
5814 ftype
= build_function_type (void_type_node
, tmp
);
5815 local_define_builtin ("__builtin_stack_restore", ftype
,
5816 BUILT_IN_STACK_RESTORE
,
5817 "__builtin_stack_restore", ECF_NOTHROW
);
5819 ftype
= build_function_type (void_type_node
, void_list_node
);
5820 local_define_builtin ("__builtin_profile_func_enter", ftype
,
5821 BUILT_IN_PROFILE_FUNC_ENTER
, "profile_func_enter", 0);
5822 local_define_builtin ("__builtin_profile_func_exit", ftype
,
5823 BUILT_IN_PROFILE_FUNC_EXIT
, "profile_func_exit", 0);
5825 /* Complex multiplication and division. These are handled as builtins
5826 rather than optabs because emit_library_call_value doesn't support
5827 complex. Further, we can do slightly better with folding these
5828 beasties if the real and complex parts of the arguments are separate. */
5830 enum machine_mode mode
;
5832 for (mode
= MIN_MODE_COMPLEX_FLOAT
; mode
<= MAX_MODE_COMPLEX_FLOAT
; ++mode
)
5834 char mode_name_buf
[4], *q
;
5836 enum built_in_function mcode
, dcode
;
5837 tree type
, inner_type
;
5839 type
= lang_hooks
.types
.type_for_mode (mode
, 0);
5842 inner_type
= TREE_TYPE (type
);
5844 tmp
= tree_cons (NULL_TREE
, inner_type
, void_list_node
);
5845 tmp
= tree_cons (NULL_TREE
, inner_type
, tmp
);
5846 tmp
= tree_cons (NULL_TREE
, inner_type
, tmp
);
5847 tmp
= tree_cons (NULL_TREE
, inner_type
, tmp
);
5848 ftype
= build_function_type (type
, tmp
);
5850 mcode
= BUILT_IN_COMPLEX_MUL_MIN
+ mode
- MIN_MODE_COMPLEX_FLOAT
;
5851 dcode
= BUILT_IN_COMPLEX_DIV_MIN
+ mode
- MIN_MODE_COMPLEX_FLOAT
;
5853 for (p
= GET_MODE_NAME (mode
), q
= mode_name_buf
; *p
; p
++, q
++)
5857 built_in_names
[mcode
] = concat ("__mul", mode_name_buf
, "3", NULL
);
5858 local_define_builtin (built_in_names
[mcode
], ftype
, mcode
,
5859 built_in_names
[mcode
], ECF_CONST
| ECF_NOTHROW
);
5861 built_in_names
[dcode
] = concat ("__div", mode_name_buf
, "3", NULL
);
5862 local_define_builtin (built_in_names
[dcode
], ftype
, dcode
,
5863 built_in_names
[dcode
], ECF_CONST
| ECF_NOTHROW
);
5868 /* HACK. GROSS. This is absolutely disgusting. I wish there was a
5871 If we requested a pointer to a vector, build up the pointers that
5872 we stripped off while looking for the inner type. Similarly for
5873 return values from functions.
5875 The argument TYPE is the top of the chain, and BOTTOM is the
5876 new type which we will point to. */
5879 reconstruct_complex_type (tree type
, tree bottom
)
5883 if (POINTER_TYPE_P (type
))
5885 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5886 outer
= build_pointer_type (inner
);
5888 else if (TREE_CODE (type
) == ARRAY_TYPE
)
5890 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5891 outer
= build_array_type (inner
, TYPE_DOMAIN (type
));
5893 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5895 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5896 outer
= build_function_type (inner
, TYPE_ARG_TYPES (type
));
5898 else if (TREE_CODE (type
) == METHOD_TYPE
)
5901 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5902 /* The build_method_type_directly() routine prepends 'this' to argument list,
5903 so we must compensate by getting rid of it. */
5904 argtypes
= TYPE_ARG_TYPES (type
);
5905 outer
= build_method_type_directly (TYPE_METHOD_BASETYPE (type
),
5907 TYPE_ARG_TYPES (type
));
5908 TYPE_ARG_TYPES (outer
) = argtypes
;
5913 TYPE_READONLY (outer
) = TYPE_READONLY (type
);
5914 TYPE_VOLATILE (outer
) = TYPE_VOLATILE (type
);
5919 /* Returns a vector tree node given a mode (integer, vector, or BLKmode) and
5922 build_vector_type_for_mode (tree innertype
, enum machine_mode mode
)
5926 switch (GET_MODE_CLASS (mode
))
5928 case MODE_VECTOR_INT
:
5929 case MODE_VECTOR_FLOAT
:
5930 nunits
= GET_MODE_NUNITS (mode
);
5934 /* Check that there are no leftover bits. */
5935 gcc_assert (GET_MODE_BITSIZE (mode
)
5936 % TREE_INT_CST_LOW (TYPE_SIZE (innertype
)) == 0);
5938 nunits
= GET_MODE_BITSIZE (mode
)
5939 / TREE_INT_CST_LOW (TYPE_SIZE (innertype
));
5946 return make_vector_type (innertype
, nunits
, mode
);
5949 /* Similarly, but takes the inner type and number of units, which must be
5953 build_vector_type (tree innertype
, int nunits
)
5955 return make_vector_type (innertype
, nunits
, VOIDmode
);
5958 /* Given an initializer INIT, return TRUE if INIT is zero or some
5959 aggregate of zeros. Otherwise return FALSE. */
5961 initializer_zerop (tree init
)
5967 switch (TREE_CODE (init
))
5970 return integer_zerop (init
);
5973 /* ??? Note that this is not correct for C4X float formats. There,
5974 a bit pattern of all zeros is 1.0; 0.0 is encoded with the most
5975 negative exponent. */
5976 return real_zerop (init
)
5977 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (init
));
5980 return integer_zerop (init
)
5981 || (real_zerop (init
)
5982 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_REALPART (init
)))
5983 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_IMAGPART (init
))));
5986 for (elt
= TREE_VECTOR_CST_ELTS (init
); elt
; elt
= TREE_CHAIN (elt
))
5987 if (!initializer_zerop (TREE_VALUE (elt
)))
5992 elt
= CONSTRUCTOR_ELTS (init
);
5993 if (elt
== NULL_TREE
)
5996 for (; elt
; elt
= TREE_CHAIN (elt
))
5997 if (! initializer_zerop (TREE_VALUE (elt
)))
6007 add_var_to_bind_expr (tree bind_expr
, tree var
)
6009 BIND_EXPR_VARS (bind_expr
)
6010 = chainon (BIND_EXPR_VARS (bind_expr
), var
);
6011 if (BIND_EXPR_BLOCK (bind_expr
))
6012 BLOCK_VARS (BIND_EXPR_BLOCK (bind_expr
))
6013 = BIND_EXPR_VARS (bind_expr
);
6016 /* Build an empty statement. */
6019 build_empty_stmt (void)
6021 return build1 (NOP_EXPR
, void_type_node
, size_zero_node
);
6025 /* Returns true if it is possible to prove that the index of
6026 an array access REF (an ARRAY_REF expression) falls into the
6030 in_array_bounds_p (tree ref
)
6032 tree idx
= TREE_OPERAND (ref
, 1);
6035 if (TREE_CODE (idx
) != INTEGER_CST
)
6038 min
= array_ref_low_bound (ref
);
6039 max
= array_ref_up_bound (ref
);
6042 || TREE_CODE (min
) != INTEGER_CST
6043 || TREE_CODE (max
) != INTEGER_CST
)
6046 if (tree_int_cst_lt (idx
, min
)
6047 || tree_int_cst_lt (max
, idx
))
6053 /* Return true if T (assumed to be a DECL) is a global variable. */
6056 is_global_var (tree t
)
6058 return (TREE_STATIC (t
) || DECL_EXTERNAL (t
));
6061 /* Return true if T (assumed to be a DECL) must be assigned a memory
6065 needs_to_live_in_memory (tree t
)
6067 return (TREE_ADDRESSABLE (t
)
6068 || is_global_var (t
)
6069 || (TREE_CODE (t
) == RESULT_DECL
6070 && aggregate_value_p (t
, current_function_decl
)));
6073 /* There are situations in which a language considers record types
6074 compatible which have different field lists. Decide if two fields
6075 are compatible. It is assumed that the parent records are compatible. */
6078 fields_compatible_p (tree f1
, tree f2
)
6080 if (!operand_equal_p (DECL_FIELD_BIT_OFFSET (f1
),
6081 DECL_FIELD_BIT_OFFSET (f2
), OEP_ONLY_CONST
))
6084 if (!operand_equal_p (DECL_FIELD_OFFSET (f1
),
6085 DECL_FIELD_OFFSET (f2
), OEP_ONLY_CONST
))
6088 if (!lang_hooks
.types_compatible_p (TREE_TYPE (f1
), TREE_TYPE (f2
)))
6094 /* Locate within RECORD a field that is compatible with ORIG_FIELD. */
6097 find_compatible_field (tree record
, tree orig_field
)
6101 for (f
= TYPE_FIELDS (record
); f
; f
= TREE_CHAIN (f
))
6102 if (TREE_CODE (f
) == FIELD_DECL
6103 && fields_compatible_p (f
, orig_field
))
6106 /* ??? Why isn't this on the main fields list? */
6107 f
= TYPE_VFIELD (record
);
6108 if (f
&& TREE_CODE (f
) == FIELD_DECL
6109 && fields_compatible_p (f
, orig_field
))
6112 /* ??? We should abort here, but Java appears to do Bad Things
6113 with inherited fields. */
6117 /* Return value of a constant X. */
6120 int_cst_value (tree x
)
6122 unsigned bits
= TYPE_PRECISION (TREE_TYPE (x
));
6123 unsigned HOST_WIDE_INT val
= TREE_INT_CST_LOW (x
);
6124 bool negative
= ((val
>> (bits
- 1)) & 1) != 0;
6126 gcc_assert (bits
<= HOST_BITS_PER_WIDE_INT
);
6129 val
|= (~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1) << 1;
6131 val
&= ~((~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1) << 1);
6136 /* Returns the greatest common divisor of A and B, which must be
6140 tree_fold_gcd (tree a
, tree b
)
6143 tree type
= TREE_TYPE (a
);
6145 gcc_assert (TREE_CODE (a
) == INTEGER_CST
);
6146 gcc_assert (TREE_CODE (b
) == INTEGER_CST
);
6148 if (integer_zerop (a
))
6151 if (integer_zerop (b
))
6154 if (tree_int_cst_sgn (a
) == -1)
6155 a
= fold (build2 (MULT_EXPR
, type
, a
,
6156 convert (type
, integer_minus_one_node
)));
6158 if (tree_int_cst_sgn (b
) == -1)
6159 b
= fold (build2 (MULT_EXPR
, type
, b
,
6160 convert (type
, integer_minus_one_node
)));
6164 a_mod_b
= fold (build2 (FLOOR_MOD_EXPR
, type
, a
, b
));
6166 if (!TREE_INT_CST_LOW (a_mod_b
)
6167 && !TREE_INT_CST_HIGH (a_mod_b
))
6175 /* Returns unsigned variant of TYPE. */
6178 unsigned_type_for (tree type
)
6180 return lang_hooks
.types
.unsigned_type (type
);
6183 /* Returns signed variant of TYPE. */
6186 signed_type_for (tree type
)
6188 return lang_hooks
.types
.signed_type (type
);
6191 /* Returns the largest value obtainable by casting something in INNER type to
6195 upper_bound_in_type (tree outer
, tree inner
)
6197 unsigned HOST_WIDE_INT lo
, hi
;
6198 unsigned bits
= TYPE_PRECISION (inner
);
6200 if (TYPE_UNSIGNED (outer
) || TYPE_UNSIGNED (inner
))
6202 /* Zero extending in these cases. */
6203 if (bits
<= HOST_BITS_PER_WIDE_INT
)
6206 lo
= (~(unsigned HOST_WIDE_INT
) 0)
6207 >> (HOST_BITS_PER_WIDE_INT
- bits
);
6211 hi
= (~(unsigned HOST_WIDE_INT
) 0)
6212 >> (2 * HOST_BITS_PER_WIDE_INT
- bits
);
6213 lo
= ~(unsigned HOST_WIDE_INT
) 0;
6218 /* Sign extending in these cases. */
6219 if (bits
<= HOST_BITS_PER_WIDE_INT
)
6222 lo
= (~(unsigned HOST_WIDE_INT
) 0)
6223 >> (HOST_BITS_PER_WIDE_INT
- bits
) >> 1;
6227 hi
= (~(unsigned HOST_WIDE_INT
) 0)
6228 >> (2 * HOST_BITS_PER_WIDE_INT
- bits
) >> 1;
6229 lo
= ~(unsigned HOST_WIDE_INT
) 0;
6233 return fold_convert (outer
,
6234 build_int_cst_wide (inner
, lo
, hi
));
6237 /* Returns the smallest value obtainable by casting something in INNER type to
6241 lower_bound_in_type (tree outer
, tree inner
)
6243 unsigned HOST_WIDE_INT lo
, hi
;
6244 unsigned bits
= TYPE_PRECISION (inner
);
6246 if (TYPE_UNSIGNED (outer
) || TYPE_UNSIGNED (inner
))
6248 else if (bits
<= HOST_BITS_PER_WIDE_INT
)
6250 hi
= ~(unsigned HOST_WIDE_INT
) 0;
6251 lo
= (~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1);
6255 hi
= (~(unsigned HOST_WIDE_INT
) 0) << (bits
- HOST_BITS_PER_WIDE_INT
- 1);
6259 return fold_convert (outer
,
6260 build_int_cst_wide (inner
, lo
, hi
));
6263 /* Return nonzero if two operands that are suitable for PHI nodes are
6264 necessarily equal. Specifically, both ARG0 and ARG1 must be either
6265 SSA_NAME or invariant. Note that this is strictly an optimization.
6266 That is, callers of this function can directly call operand_equal_p
6267 and get the same result, only slower. */
6270 operand_equal_for_phi_arg_p (tree arg0
, tree arg1
)
6274 if (TREE_CODE (arg0
) == SSA_NAME
|| TREE_CODE (arg1
) == SSA_NAME
)
6276 return operand_equal_p (arg0
, arg1
, 0);
6279 /* Returns number of zeros at the end of binary representation of X.
6281 ??? Use ffs if available? */
6284 num_ending_zeros (tree x
)
6286 unsigned HOST_WIDE_INT fr
, nfr
;
6287 unsigned num
, abits
;
6288 tree type
= TREE_TYPE (x
);
6290 if (TREE_INT_CST_LOW (x
) == 0)
6292 num
= HOST_BITS_PER_WIDE_INT
;
6293 fr
= TREE_INT_CST_HIGH (x
);
6298 fr
= TREE_INT_CST_LOW (x
);
6301 for (abits
= HOST_BITS_PER_WIDE_INT
/ 2; abits
; abits
/= 2)
6304 if (nfr
<< abits
== fr
)
6311 if (num
> TYPE_PRECISION (type
))
6312 num
= TYPE_PRECISION (type
);
6314 return build_int_cst_type (type
, num
);
6318 #define WALK_SUBTREE(NODE) \
6321 result = walk_tree (&(NODE), func, data, pset); \
6327 /* This is a subroutine of walk_tree that walks field of TYPE that are to
6328 be walked whenever a type is seen in the tree. Rest of operands and return
6329 value are as for walk_tree. */
6332 walk_type_fields (tree type
, walk_tree_fn func
, void *data
,
6333 struct pointer_set_t
*pset
)
6335 tree result
= NULL_TREE
;
6337 switch (TREE_CODE (type
))
6340 case REFERENCE_TYPE
:
6341 /* We have to worry about mutually recursive pointers. These can't
6342 be written in C. They can in Ada. It's pathological, but
6343 there's an ACATS test (c38102a) that checks it. Deal with this
6344 by checking if we're pointing to another pointer, that one
6345 points to another pointer, that one does too, and we have no htab.
6346 If so, get a hash table. We check three levels deep to avoid
6347 the cost of the hash table if we don't need one. */
6348 if (POINTER_TYPE_P (TREE_TYPE (type
))
6349 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (type
)))
6350 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (TREE_TYPE (type
))))
6353 result
= walk_tree_without_duplicates (&TREE_TYPE (type
),
6361 /* ... fall through ... */
6364 WALK_SUBTREE (TREE_TYPE (type
));
6368 WALK_SUBTREE (TYPE_METHOD_BASETYPE (type
));
6373 WALK_SUBTREE (TREE_TYPE (type
));
6377 /* We never want to walk into default arguments. */
6378 for (arg
= TYPE_ARG_TYPES (type
); arg
; arg
= TREE_CHAIN (arg
))
6379 WALK_SUBTREE (TREE_VALUE (arg
));
6384 /* Don't follow this nodes's type if a pointer for fear that we'll
6385 have infinite recursion. Those types are uninteresting anyway. */
6386 if (!POINTER_TYPE_P (TREE_TYPE (type
))
6387 && TREE_CODE (TREE_TYPE (type
)) != OFFSET_TYPE
)
6388 WALK_SUBTREE (TREE_TYPE (type
));
6389 WALK_SUBTREE (TYPE_DOMAIN (type
));
6397 WALK_SUBTREE (TYPE_MIN_VALUE (type
));
6398 WALK_SUBTREE (TYPE_MAX_VALUE (type
));
6402 WALK_SUBTREE (TREE_TYPE (type
));
6403 WALK_SUBTREE (TYPE_OFFSET_BASETYPE (type
));
6413 /* Apply FUNC to all the sub-trees of TP in a pre-order traversal. FUNC is
6414 called with the DATA and the address of each sub-tree. If FUNC returns a
6415 non-NULL value, the traversal is aborted, and the value returned by FUNC
6416 is returned. If PSET is non-NULL it is used to record the nodes visited,
6417 and to avoid visiting a node more than once. */
6420 walk_tree (tree
*tp
, walk_tree_fn func
, void *data
, struct pointer_set_t
*pset
)
6422 enum tree_code code
;
6426 #define WALK_SUBTREE_TAIL(NODE) \
6430 goto tail_recurse; \
6435 /* Skip empty subtrees. */
6439 /* Don't walk the same tree twice, if the user has requested
6440 that we avoid doing so. */
6441 if (pset
&& pointer_set_insert (pset
, *tp
))
6444 /* Call the function. */
6446 result
= (*func
) (tp
, &walk_subtrees
, data
);
6448 /* If we found something, return it. */
6452 code
= TREE_CODE (*tp
);
6454 /* Even if we didn't, FUNC may have decided that there was nothing
6455 interesting below this point in the tree. */
6458 if (code
== TREE_LIST
)
6459 /* But we still need to check our siblings. */
6460 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp
));
6465 result
= lang_hooks
.tree_inlining
.walk_subtrees (tp
, &walk_subtrees
, func
,
6467 if (result
|| ! walk_subtrees
)
6470 /* If this is a DECL_EXPR, walk into various fields of the type that it's
6471 defining. We only want to walk into these fields of a type in this
6472 case. Note that decls get walked as part of the processing of a
6475 ??? Precisely which fields of types that we are supposed to walk in
6476 this case vs. the normal case aren't well defined. */
6477 if (code
== DECL_EXPR
6478 && TREE_CODE (DECL_EXPR_DECL (*tp
)) == TYPE_DECL
6479 && TREE_CODE (TREE_TYPE (DECL_EXPR_DECL (*tp
))) != ERROR_MARK
)
6481 tree
*type_p
= &TREE_TYPE (DECL_EXPR_DECL (*tp
));
6483 /* Call the function for the type. See if it returns anything or
6484 doesn't want us to continue. If we are to continue, walk both
6485 the normal fields and those for the declaration case. */
6486 result
= (*func
) (type_p
, &walk_subtrees
, data
);
6487 if (result
|| !walk_subtrees
)
6490 result
= walk_type_fields (*type_p
, func
, data
, pset
);
6494 WALK_SUBTREE (TYPE_SIZE (*type_p
));
6495 WALK_SUBTREE (TYPE_SIZE_UNIT (*type_p
));
6497 /* If this is a record type, also walk the fields. */
6498 if (TREE_CODE (*type_p
) == RECORD_TYPE
6499 || TREE_CODE (*type_p
) == UNION_TYPE
6500 || TREE_CODE (*type_p
) == QUAL_UNION_TYPE
)
6504 for (field
= TYPE_FIELDS (*type_p
); field
;
6505 field
= TREE_CHAIN (field
))
6507 /* We'd like to look at the type of the field, but we can easily
6508 get infinite recursion. So assume it's pointed to elsewhere
6509 in the tree. Also, ignore things that aren't fields. */
6510 if (TREE_CODE (field
) != FIELD_DECL
)
6513 WALK_SUBTREE (DECL_FIELD_OFFSET (field
));
6514 WALK_SUBTREE (DECL_SIZE (field
));
6515 WALK_SUBTREE (DECL_SIZE_UNIT (field
));
6516 if (TREE_CODE (*type_p
) == QUAL_UNION_TYPE
)
6517 WALK_SUBTREE (DECL_QUALIFIER (field
));
6522 else if (code
!= SAVE_EXPR
6523 && code
!= BIND_EXPR
6524 && IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code
)))
6528 /* Walk over all the sub-trees of this operand. */
6529 len
= TREE_CODE_LENGTH (code
);
6530 /* TARGET_EXPRs are peculiar: operands 1 and 3 can be the same.
6531 But, we only want to walk once. */
6532 if (code
== TARGET_EXPR
6533 && TREE_OPERAND (*tp
, 3) == TREE_OPERAND (*tp
, 1))
6536 /* Go through the subtrees. We need to do this in forward order so
6537 that the scope of a FOR_EXPR is handled properly. */
6538 #ifdef DEBUG_WALK_TREE
6539 for (i
= 0; i
< len
; ++i
)
6540 WALK_SUBTREE (TREE_OPERAND (*tp
, i
));
6542 for (i
= 0; i
< len
- 1; ++i
)
6543 WALK_SUBTREE (TREE_OPERAND (*tp
, i
));
6547 /* The common case is that we may tail recurse here. */
6548 if (code
!= BIND_EXPR
6549 && !TREE_CHAIN (*tp
))
6550 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp
, len
- 1));
6552 WALK_SUBTREE (TREE_OPERAND (*tp
, len
- 1));
6557 /* If this is a type, walk the needed fields in the type. */
6558 else if (TYPE_P (*tp
))
6560 result
= walk_type_fields (*tp
, func
, data
, pset
);
6566 /* Not one of the easy cases. We must explicitly go through the
6571 case IDENTIFIER_NODE
:
6577 case PLACEHOLDER_EXPR
:
6581 /* None of thse have subtrees other than those already walked
6586 WALK_SUBTREE (TREE_VALUE (*tp
));
6587 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp
));
6592 int len
= TREE_VEC_LENGTH (*tp
);
6597 /* Walk all elements but the first. */
6599 WALK_SUBTREE (TREE_VEC_ELT (*tp
, len
));
6601 /* Now walk the first one as a tail call. */
6602 WALK_SUBTREE_TAIL (TREE_VEC_ELT (*tp
, 0));
6606 WALK_SUBTREE (TREE_REALPART (*tp
));
6607 WALK_SUBTREE_TAIL (TREE_IMAGPART (*tp
));
6610 WALK_SUBTREE_TAIL (CONSTRUCTOR_ELTS (*tp
));
6613 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp
, 0));
6618 for (decl
= BIND_EXPR_VARS (*tp
); decl
; decl
= TREE_CHAIN (decl
))
6620 /* Walk the DECL_INITIAL and DECL_SIZE. We don't want to walk
6621 into declarations that are just mentioned, rather than
6622 declared; they don't really belong to this part of the tree.
6623 And, we can see cycles: the initializer for a declaration
6624 can refer to the declaration itself. */
6625 WALK_SUBTREE (DECL_INITIAL (decl
));
6626 WALK_SUBTREE (DECL_SIZE (decl
));
6627 WALK_SUBTREE (DECL_SIZE_UNIT (decl
));
6629 WALK_SUBTREE_TAIL (BIND_EXPR_BODY (*tp
));
6632 case STATEMENT_LIST
:
6634 tree_stmt_iterator i
;
6635 for (i
= tsi_start (*tp
); !tsi_end_p (i
); tsi_next (&i
))
6636 WALK_SUBTREE (*tsi_stmt_ptr (i
));
6641 /* ??? This could be a language-defined node. We really should make
6642 a hook for it, but right now just ignore it. */
6647 /* We didn't find what we were looking for. */
6650 #undef WALK_SUBTREE_TAIL
6654 /* Like walk_tree, but does not walk duplicate nodes more than once. */
6657 walk_tree_without_duplicates (tree
*tp
, walk_tree_fn func
, void *data
)
6660 struct pointer_set_t
*pset
;
6662 pset
= pointer_set_create ();
6663 result
= walk_tree (tp
, func
, data
, pset
);
6664 pointer_set_destroy (pset
);
6668 #include "gt-tree.h"