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. It must be representable in
1500 that way (since it could be a signed value, we don't have the
1501 option 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. It must be representable in
1520 that way (since it could be a signed value, we don't have the
1521 option 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
:
1917 /* Here we just check the bounds. */
1918 return (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (type
))
1919 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (type
)));
1922 /* We're already checked the component type (TREE_TYPE), so just check
1924 return type_contains_placeholder_p (TYPE_DOMAIN (type
));
1928 case QUAL_UNION_TYPE
:
1932 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
1933 if (TREE_CODE (field
) == FIELD_DECL
1934 && (CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (field
))
1935 || (TREE_CODE (type
) == QUAL_UNION_TYPE
1936 && CONTAINS_PLACEHOLDER_P (DECL_QUALIFIER (field
)))
1937 || type_contains_placeholder_p (TREE_TYPE (field
))))
1949 type_contains_placeholder_p (tree type
)
1953 /* If the contains_placeholder_bits field has been initialized,
1954 then we know the answer. */
1955 if (TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) > 0)
1956 return TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) - 1;
1958 /* Indicate that we've seen this type node, and the answer is false.
1959 This is what we want to return if we run into recursion via fields. */
1960 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) = 1;
1962 /* Compute the real value. */
1963 result
= type_contains_placeholder_1 (type
);
1965 /* Store the real value. */
1966 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) = result
+ 1;
1971 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
1972 return a tree with all occurrences of references to F in a
1973 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
1974 contains only arithmetic expressions or a CALL_EXPR with a
1975 PLACEHOLDER_EXPR occurring only in its arglist. */
1978 substitute_in_expr (tree exp
, tree f
, tree r
)
1980 enum tree_code code
= TREE_CODE (exp
);
1985 /* We handle TREE_LIST and COMPONENT_REF separately. */
1986 if (code
== TREE_LIST
)
1988 op0
= SUBSTITUTE_IN_EXPR (TREE_CHAIN (exp
), f
, r
);
1989 op1
= SUBSTITUTE_IN_EXPR (TREE_VALUE (exp
), f
, r
);
1990 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
1993 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
1995 else if (code
== COMPONENT_REF
)
1997 /* If this expression is getting a value from a PLACEHOLDER_EXPR
1998 and it is the right field, replace it with R. */
1999 for (inner
= TREE_OPERAND (exp
, 0);
2000 REFERENCE_CLASS_P (inner
);
2001 inner
= TREE_OPERAND (inner
, 0))
2003 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
2004 && TREE_OPERAND (exp
, 1) == f
)
2007 /* If this expression hasn't been completed let, leave it alone. */
2008 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
&& TREE_TYPE (inner
) == 0)
2011 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2012 if (op0
== TREE_OPERAND (exp
, 0))
2015 new = fold (build3 (COMPONENT_REF
, TREE_TYPE (exp
),
2016 op0
, TREE_OPERAND (exp
, 1), NULL_TREE
));
2019 switch (TREE_CODE_CLASS (code
))
2022 case tcc_declaration
:
2025 case tcc_exceptional
:
2028 case tcc_comparison
:
2029 case tcc_expression
:
2031 switch (TREE_CODE_LENGTH (code
))
2037 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2038 if (op0
== TREE_OPERAND (exp
, 0))
2041 new = fold (build1 (code
, TREE_TYPE (exp
), op0
));
2045 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2046 op1
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 1), f
, r
);
2048 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
2051 new = fold (build2 (code
, TREE_TYPE (exp
), op0
, op1
));
2055 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2056 op1
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 1), f
, r
);
2057 op2
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 2), f
, r
);
2059 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2060 && op2
== TREE_OPERAND (exp
, 2))
2063 new = fold (build3 (code
, TREE_TYPE (exp
), op0
, op1
, op2
));
2075 TREE_READONLY (new) = TREE_READONLY (exp
);
2079 /* Similar, but look for a PLACEHOLDER_EXPR in EXP and find a replacement
2080 for it within OBJ, a tree that is an object or a chain of references. */
2083 substitute_placeholder_in_expr (tree exp
, tree obj
)
2085 enum tree_code code
= TREE_CODE (exp
);
2086 tree op0
, op1
, op2
, op3
;
2088 /* If this is a PLACEHOLDER_EXPR, see if we find a corresponding type
2089 in the chain of OBJ. */
2090 if (code
== PLACEHOLDER_EXPR
)
2092 tree need_type
= TYPE_MAIN_VARIANT (TREE_TYPE (exp
));
2095 for (elt
= obj
; elt
!= 0;
2096 elt
= ((TREE_CODE (elt
) == COMPOUND_EXPR
2097 || TREE_CODE (elt
) == COND_EXPR
)
2098 ? TREE_OPERAND (elt
, 1)
2099 : (REFERENCE_CLASS_P (elt
)
2100 || UNARY_CLASS_P (elt
)
2101 || BINARY_CLASS_P (elt
)
2102 || EXPRESSION_CLASS_P (elt
))
2103 ? TREE_OPERAND (elt
, 0) : 0))
2104 if (TYPE_MAIN_VARIANT (TREE_TYPE (elt
)) == need_type
)
2107 for (elt
= obj
; elt
!= 0;
2108 elt
= ((TREE_CODE (elt
) == COMPOUND_EXPR
2109 || TREE_CODE (elt
) == COND_EXPR
)
2110 ? TREE_OPERAND (elt
, 1)
2111 : (REFERENCE_CLASS_P (elt
)
2112 || UNARY_CLASS_P (elt
)
2113 || BINARY_CLASS_P (elt
)
2114 || EXPRESSION_CLASS_P (elt
))
2115 ? TREE_OPERAND (elt
, 0) : 0))
2116 if (POINTER_TYPE_P (TREE_TYPE (elt
))
2117 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (elt
)))
2119 return fold (build1 (INDIRECT_REF
, need_type
, elt
));
2121 /* If we didn't find it, return the original PLACEHOLDER_EXPR. If it
2122 survives until RTL generation, there will be an error. */
2126 /* TREE_LIST is special because we need to look at TREE_VALUE
2127 and TREE_CHAIN, not TREE_OPERANDS. */
2128 else if (code
== TREE_LIST
)
2130 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp
), obj
);
2131 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp
), obj
);
2132 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
2135 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
2138 switch (TREE_CODE_CLASS (code
))
2141 case tcc_declaration
:
2144 case tcc_exceptional
:
2147 case tcc_comparison
:
2148 case tcc_expression
:
2151 switch (TREE_CODE_LENGTH (code
))
2157 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2158 if (op0
== TREE_OPERAND (exp
, 0))
2161 return fold (build1 (code
, TREE_TYPE (exp
), op0
));
2164 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2165 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2167 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
2170 return fold (build2 (code
, TREE_TYPE (exp
), op0
, op1
));
2173 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2174 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2175 op2
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 2), obj
);
2177 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2178 && op2
== TREE_OPERAND (exp
, 2))
2181 return fold (build3 (code
, TREE_TYPE (exp
), op0
, op1
, op2
));
2184 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2185 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2186 op2
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 2), obj
);
2187 op3
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 3), obj
);
2189 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2190 && op2
== TREE_OPERAND (exp
, 2)
2191 && op3
== TREE_OPERAND (exp
, 3))
2194 return fold (build4 (code
, TREE_TYPE (exp
), op0
, op1
, op2
, op3
));
2206 /* Stabilize a reference so that we can use it any number of times
2207 without causing its operands to be evaluated more than once.
2208 Returns the stabilized reference. This works by means of save_expr,
2209 so see the caveats in the comments about save_expr.
2211 Also allows conversion expressions whose operands are references.
2212 Any other kind of expression is returned unchanged. */
2215 stabilize_reference (tree ref
)
2218 enum tree_code code
= TREE_CODE (ref
);
2225 /* No action is needed in this case. */
2231 case FIX_TRUNC_EXPR
:
2232 case FIX_FLOOR_EXPR
:
2233 case FIX_ROUND_EXPR
:
2235 result
= build_nt (code
, stabilize_reference (TREE_OPERAND (ref
, 0)));
2239 result
= build_nt (INDIRECT_REF
,
2240 stabilize_reference_1 (TREE_OPERAND (ref
, 0)));
2244 result
= build_nt (COMPONENT_REF
,
2245 stabilize_reference (TREE_OPERAND (ref
, 0)),
2246 TREE_OPERAND (ref
, 1), NULL_TREE
);
2250 result
= build_nt (BIT_FIELD_REF
,
2251 stabilize_reference (TREE_OPERAND (ref
, 0)),
2252 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2253 stabilize_reference_1 (TREE_OPERAND (ref
, 2)));
2257 result
= build_nt (ARRAY_REF
,
2258 stabilize_reference (TREE_OPERAND (ref
, 0)),
2259 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2260 TREE_OPERAND (ref
, 2), TREE_OPERAND (ref
, 3));
2263 case ARRAY_RANGE_REF
:
2264 result
= build_nt (ARRAY_RANGE_REF
,
2265 stabilize_reference (TREE_OPERAND (ref
, 0)),
2266 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2267 TREE_OPERAND (ref
, 2), TREE_OPERAND (ref
, 3));
2271 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2272 it wouldn't be ignored. This matters when dealing with
2274 return stabilize_reference_1 (ref
);
2276 /* If arg isn't a kind of lvalue we recognize, make no change.
2277 Caller should recognize the error for an invalid lvalue. */
2282 return error_mark_node
;
2285 TREE_TYPE (result
) = TREE_TYPE (ref
);
2286 TREE_READONLY (result
) = TREE_READONLY (ref
);
2287 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (ref
);
2288 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (ref
);
2293 /* Subroutine of stabilize_reference; this is called for subtrees of
2294 references. Any expression with side-effects must be put in a SAVE_EXPR
2295 to ensure that it is only evaluated once.
2297 We don't put SAVE_EXPR nodes around everything, because assigning very
2298 simple expressions to temporaries causes us to miss good opportunities
2299 for optimizations. Among other things, the opportunity to fold in the
2300 addition of a constant into an addressing mode often gets lost, e.g.
2301 "y[i+1] += x;". In general, we take the approach that we should not make
2302 an assignment unless we are forced into it - i.e., that any non-side effect
2303 operator should be allowed, and that cse should take care of coalescing
2304 multiple utterances of the same expression should that prove fruitful. */
2307 stabilize_reference_1 (tree e
)
2310 enum tree_code code
= TREE_CODE (e
);
2312 /* We cannot ignore const expressions because it might be a reference
2313 to a const array but whose index contains side-effects. But we can
2314 ignore things that are actual constant or that already have been
2315 handled by this function. */
2317 if (TREE_INVARIANT (e
))
2320 switch (TREE_CODE_CLASS (code
))
2322 case tcc_exceptional
:
2324 case tcc_declaration
:
2325 case tcc_comparison
:
2327 case tcc_expression
:
2329 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2330 so that it will only be evaluated once. */
2331 /* The reference (r) and comparison (<) classes could be handled as
2332 below, but it is generally faster to only evaluate them once. */
2333 if (TREE_SIDE_EFFECTS (e
))
2334 return save_expr (e
);
2338 /* Constants need no processing. In fact, we should never reach
2343 /* Division is slow and tends to be compiled with jumps,
2344 especially the division by powers of 2 that is often
2345 found inside of an array reference. So do it just once. */
2346 if (code
== TRUNC_DIV_EXPR
|| code
== TRUNC_MOD_EXPR
2347 || code
== FLOOR_DIV_EXPR
|| code
== FLOOR_MOD_EXPR
2348 || code
== CEIL_DIV_EXPR
|| code
== CEIL_MOD_EXPR
2349 || code
== ROUND_DIV_EXPR
|| code
== ROUND_MOD_EXPR
)
2350 return save_expr (e
);
2351 /* Recursively stabilize each operand. */
2352 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)),
2353 stabilize_reference_1 (TREE_OPERAND (e
, 1)));
2357 /* Recursively stabilize each operand. */
2358 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)));
2365 TREE_TYPE (result
) = TREE_TYPE (e
);
2366 TREE_READONLY (result
) = TREE_READONLY (e
);
2367 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (e
);
2368 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (e
);
2369 TREE_INVARIANT (result
) = 1;
2374 /* Low-level constructors for expressions. */
2376 /* A helper function for build1 and constant folders. Set TREE_CONSTANT,
2377 TREE_INVARIANT, and TREE_SIDE_EFFECTS for an ADDR_EXPR. */
2380 recompute_tree_invarant_for_addr_expr (tree t
)
2383 bool tc
= true, ti
= true, se
= false;
2385 /* We started out assuming this address is both invariant and constant, but
2386 does not have side effects. Now go down any handled components and see if
2387 any of them involve offsets that are either non-constant or non-invariant.
2388 Also check for side-effects.
2390 ??? Note that this code makes no attempt to deal with the case where
2391 taking the address of something causes a copy due to misalignment. */
2393 #define UPDATE_TITCSE(NODE) \
2394 do { tree _node = (NODE); \
2395 if (_node && !TREE_INVARIANT (_node)) ti = false; \
2396 if (_node && !TREE_CONSTANT (_node)) tc = false; \
2397 if (_node && TREE_SIDE_EFFECTS (_node)) se = true; } while (0)
2399 for (node
= TREE_OPERAND (t
, 0); handled_component_p (node
);
2400 node
= TREE_OPERAND (node
, 0))
2402 /* If the first operand doesn't have an ARRAY_TYPE, this is a bogus
2403 array reference (probably made temporarily by the G++ front end),
2404 so ignore all the operands. */
2405 if ((TREE_CODE (node
) == ARRAY_REF
2406 || TREE_CODE (node
) == ARRAY_RANGE_REF
)
2407 && TREE_CODE (TREE_TYPE (TREE_OPERAND (node
, 0))) == ARRAY_TYPE
)
2409 UPDATE_TITCSE (TREE_OPERAND (node
, 1));
2410 if (TREE_OPERAND (node
, 2))
2411 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2412 if (TREE_OPERAND (node
, 3))
2413 UPDATE_TITCSE (TREE_OPERAND (node
, 3));
2415 /* Likewise, just because this is a COMPONENT_REF doesn't mean we have a
2416 FIELD_DECL, apparently. The G++ front end can put something else
2417 there, at least temporarily. */
2418 else if (TREE_CODE (node
) == COMPONENT_REF
2419 && TREE_CODE (TREE_OPERAND (node
, 1)) == FIELD_DECL
)
2421 if (TREE_OPERAND (node
, 2))
2422 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2424 else if (TREE_CODE (node
) == BIT_FIELD_REF
)
2425 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2428 /* Now see what's inside. If it's an INDIRECT_REF, copy our properties from
2429 the address, since &(*a)->b is a form of addition. If it's a decl, it's
2430 invariant and constant if the decl is static. It's also invariant if it's
2431 a decl in the current function. Taking the address of a volatile variable
2432 is not volatile. If it's a constant, the address is both invariant and
2433 constant. Otherwise it's neither. */
2434 if (TREE_CODE (node
) == INDIRECT_REF
)
2435 UPDATE_TITCSE (TREE_OPERAND (node
, 0));
2436 else if (DECL_P (node
))
2440 else if (decl_function_context (node
) == current_function_decl
2441 /* Addresses of thread-local variables are invariant. */
2442 || (TREE_CODE (node
) == VAR_DECL
&& DECL_THREAD_LOCAL (node
)))
2447 else if (CONSTANT_CLASS_P (node
))
2452 se
|= TREE_SIDE_EFFECTS (node
);
2455 TREE_CONSTANT (t
) = tc
;
2456 TREE_INVARIANT (t
) = ti
;
2457 TREE_SIDE_EFFECTS (t
) = se
;
2458 #undef UPDATE_TITCSE
2461 /* Build an expression of code CODE, data type TYPE, and operands as
2462 specified. Expressions and reference nodes can be created this way.
2463 Constants, decls, types and misc nodes cannot be.
2465 We define 5 non-variadic functions, from 0 to 4 arguments. This is
2466 enough for all extant tree codes. These functions can be called
2467 directly (preferably!), but can also be obtained via GCC preprocessor
2468 magic within the build macro. */
2471 build0_stat (enum tree_code code
, tree tt MEM_STAT_DECL
)
2475 gcc_assert (TREE_CODE_LENGTH (code
) == 0);
2477 t
= make_node_stat (code PASS_MEM_STAT
);
2484 build1_stat (enum tree_code code
, tree type
, tree node MEM_STAT_DECL
)
2486 int length
= sizeof (struct tree_exp
);
2487 #ifdef GATHER_STATISTICS
2488 tree_node_kind kind
;
2492 #ifdef GATHER_STATISTICS
2493 switch (TREE_CODE_CLASS (code
))
2495 case tcc_statement
: /* an expression with side effects */
2498 case tcc_reference
: /* a reference */
2506 tree_node_counts
[(int) kind
]++;
2507 tree_node_sizes
[(int) kind
] += length
;
2510 gcc_assert (TREE_CODE_LENGTH (code
) == 1);
2512 t
= ggc_alloc_zone_stat (length
, &tree_zone PASS_MEM_STAT
);
2514 memset (t
, 0, sizeof (struct tree_common
));
2516 TREE_SET_CODE (t
, code
);
2518 TREE_TYPE (t
) = type
;
2519 #ifdef USE_MAPPED_LOCATION
2520 SET_EXPR_LOCATION (t
, UNKNOWN_LOCATION
);
2522 SET_EXPR_LOCUS (t
, NULL
);
2524 TREE_COMPLEXITY (t
) = 0;
2525 TREE_OPERAND (t
, 0) = node
;
2526 TREE_BLOCK (t
) = NULL_TREE
;
2527 if (node
&& !TYPE_P (node
))
2529 TREE_SIDE_EFFECTS (t
) = TREE_SIDE_EFFECTS (node
);
2530 TREE_READONLY (t
) = TREE_READONLY (node
);
2533 if (TREE_CODE_CLASS (code
) == tcc_statement
)
2534 TREE_SIDE_EFFECTS (t
) = 1;
2540 case PREDECREMENT_EXPR
:
2541 case PREINCREMENT_EXPR
:
2542 case POSTDECREMENT_EXPR
:
2543 case POSTINCREMENT_EXPR
:
2544 /* All of these have side-effects, no matter what their
2546 TREE_SIDE_EFFECTS (t
) = 1;
2547 TREE_READONLY (t
) = 0;
2550 case MISALIGNED_INDIRECT_REF
:
2551 case ALIGN_INDIRECT_REF
:
2553 /* Whether a dereference is readonly has nothing to do with whether
2554 its operand is readonly. */
2555 TREE_READONLY (t
) = 0;
2560 recompute_tree_invarant_for_addr_expr (t
);
2564 if (TREE_CODE_CLASS (code
) == tcc_unary
2565 && node
&& !TYPE_P (node
)
2566 && TREE_CONSTANT (node
))
2567 TREE_CONSTANT (t
) = 1;
2568 if (TREE_CODE_CLASS (code
) == tcc_unary
2569 && node
&& TREE_INVARIANT (node
))
2570 TREE_INVARIANT (t
) = 1;
2571 if (TREE_CODE_CLASS (code
) == tcc_reference
2572 && node
&& TREE_THIS_VOLATILE (node
))
2573 TREE_THIS_VOLATILE (t
) = 1;
2580 #define PROCESS_ARG(N) \
2582 TREE_OPERAND (t, N) = arg##N; \
2583 if (arg##N &&!TYPE_P (arg##N)) \
2585 if (TREE_SIDE_EFFECTS (arg##N)) \
2587 if (!TREE_READONLY (arg##N)) \
2589 if (!TREE_CONSTANT (arg##N)) \
2591 if (!TREE_INVARIANT (arg##N)) \
2597 build2_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1 MEM_STAT_DECL
)
2599 bool constant
, read_only
, side_effects
, invariant
;
2602 gcc_assert (TREE_CODE_LENGTH (code
) == 2);
2604 t
= make_node_stat (code PASS_MEM_STAT
);
2607 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
2608 result based on those same flags for the arguments. But if the
2609 arguments aren't really even `tree' expressions, we shouldn't be trying
2612 /* Expressions without side effects may be constant if their
2613 arguments are as well. */
2614 constant
= (TREE_CODE_CLASS (code
) == tcc_comparison
2615 || TREE_CODE_CLASS (code
) == tcc_binary
);
2617 side_effects
= TREE_SIDE_EFFECTS (t
);
2618 invariant
= constant
;
2623 TREE_READONLY (t
) = read_only
;
2624 TREE_CONSTANT (t
) = constant
;
2625 TREE_INVARIANT (t
) = invariant
;
2626 TREE_SIDE_EFFECTS (t
) = side_effects
;
2627 TREE_THIS_VOLATILE (t
)
2628 = (TREE_CODE_CLASS (code
) == tcc_reference
2629 && arg0
&& TREE_THIS_VOLATILE (arg0
));
2635 build3_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
2636 tree arg2 MEM_STAT_DECL
)
2638 bool constant
, read_only
, side_effects
, invariant
;
2641 gcc_assert (TREE_CODE_LENGTH (code
) == 3);
2643 t
= make_node_stat (code PASS_MEM_STAT
);
2646 side_effects
= TREE_SIDE_EFFECTS (t
);
2652 if (code
== CALL_EXPR
&& !side_effects
)
2657 /* Calls have side-effects, except those to const or
2659 i
= call_expr_flags (t
);
2660 if (!(i
& (ECF_CONST
| ECF_PURE
)))
2663 /* And even those have side-effects if their arguments do. */
2664 else for (node
= arg1
; node
; node
= TREE_CHAIN (node
))
2665 if (TREE_SIDE_EFFECTS (TREE_VALUE (node
)))
2672 TREE_SIDE_EFFECTS (t
) = side_effects
;
2673 TREE_THIS_VOLATILE (t
)
2674 = (TREE_CODE_CLASS (code
) == tcc_reference
2675 && arg0
&& TREE_THIS_VOLATILE (arg0
));
2681 build4_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
2682 tree arg2
, tree arg3 MEM_STAT_DECL
)
2684 bool constant
, read_only
, side_effects
, invariant
;
2687 gcc_assert (TREE_CODE_LENGTH (code
) == 4);
2689 t
= make_node_stat (code PASS_MEM_STAT
);
2692 side_effects
= TREE_SIDE_EFFECTS (t
);
2699 TREE_SIDE_EFFECTS (t
) = side_effects
;
2700 TREE_THIS_VOLATILE (t
)
2701 = (TREE_CODE_CLASS (code
) == tcc_reference
2702 && arg0
&& TREE_THIS_VOLATILE (arg0
));
2707 /* Backup definition for non-gcc build compilers. */
2710 (build
) (enum tree_code code
, tree tt
, ...)
2712 tree t
, arg0
, arg1
, arg2
, arg3
;
2713 int length
= TREE_CODE_LENGTH (code
);
2720 t
= build0 (code
, tt
);
2723 arg0
= va_arg (p
, tree
);
2724 t
= build1 (code
, tt
, arg0
);
2727 arg0
= va_arg (p
, tree
);
2728 arg1
= va_arg (p
, tree
);
2729 t
= build2 (code
, tt
, arg0
, arg1
);
2732 arg0
= va_arg (p
, tree
);
2733 arg1
= va_arg (p
, tree
);
2734 arg2
= va_arg (p
, tree
);
2735 t
= build3 (code
, tt
, arg0
, arg1
, arg2
);
2738 arg0
= va_arg (p
, tree
);
2739 arg1
= va_arg (p
, tree
);
2740 arg2
= va_arg (p
, tree
);
2741 arg3
= va_arg (p
, tree
);
2742 t
= build4 (code
, tt
, arg0
, arg1
, arg2
, arg3
);
2752 /* Similar except don't specify the TREE_TYPE
2753 and leave the TREE_SIDE_EFFECTS as 0.
2754 It is permissible for arguments to be null,
2755 or even garbage if their values do not matter. */
2758 build_nt (enum tree_code code
, ...)
2767 t
= make_node (code
);
2768 length
= TREE_CODE_LENGTH (code
);
2770 for (i
= 0; i
< length
; i
++)
2771 TREE_OPERAND (t
, i
) = va_arg (p
, tree
);
2777 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
2778 We do NOT enter this node in any sort of symbol table.
2780 layout_decl is used to set up the decl's storage layout.
2781 Other slots are initialized to 0 or null pointers. */
2784 build_decl_stat (enum tree_code code
, tree name
, tree type MEM_STAT_DECL
)
2788 t
= make_node_stat (code PASS_MEM_STAT
);
2790 /* if (type == error_mark_node)
2791 type = integer_type_node; */
2792 /* That is not done, deliberately, so that having error_mark_node
2793 as the type can suppress useless errors in the use of this variable. */
2795 DECL_NAME (t
) = name
;
2796 TREE_TYPE (t
) = type
;
2798 if (code
== VAR_DECL
|| code
== PARM_DECL
|| code
== RESULT_DECL
)
2800 else if (code
== FUNCTION_DECL
)
2801 DECL_MODE (t
) = FUNCTION_MODE
;
2803 /* Set default visibility to whatever the user supplied with
2804 visibility_specified depending on #pragma GCC visibility. */
2805 DECL_VISIBILITY (t
) = default_visibility
;
2806 DECL_VISIBILITY_SPECIFIED (t
) = visibility_options
.inpragma
;
2811 /* Builds and returns function declaration with NAME and TYPE. */
2814 build_fn_decl (const char *name
, tree type
)
2816 tree id
= get_identifier (name
);
2817 tree decl
= build_decl (FUNCTION_DECL
, id
, type
);
2819 DECL_EXTERNAL (decl
) = 1;
2820 TREE_PUBLIC (decl
) = 1;
2821 DECL_ARTIFICIAL (decl
) = 1;
2822 TREE_NOTHROW (decl
) = 1;
2828 /* BLOCK nodes are used to represent the structure of binding contours
2829 and declarations, once those contours have been exited and their contents
2830 compiled. This information is used for outputting debugging info. */
2833 build_block (tree vars
, tree tags ATTRIBUTE_UNUSED
, tree subblocks
,
2834 tree supercontext
, tree chain
)
2836 tree block
= make_node (BLOCK
);
2838 BLOCK_VARS (block
) = vars
;
2839 BLOCK_SUBBLOCKS (block
) = subblocks
;
2840 BLOCK_SUPERCONTEXT (block
) = supercontext
;
2841 BLOCK_CHAIN (block
) = chain
;
2845 #if 1 /* ! defined(USE_MAPPED_LOCATION) */
2846 /* ??? gengtype doesn't handle conditionals */
2847 static GTY(()) tree last_annotated_node
;
2850 #ifdef USE_MAPPED_LOCATION
2853 expand_location (source_location loc
)
2855 expanded_location xloc
;
2856 if (loc
== 0) { xloc
.file
= NULL
; xloc
.line
= 0; xloc
.column
= 0; }
2859 const struct line_map
*map
= linemap_lookup (&line_table
, loc
);
2860 xloc
.file
= map
->to_file
;
2861 xloc
.line
= SOURCE_LINE (map
, loc
);
2862 xloc
.column
= SOURCE_COLUMN (map
, loc
);
2869 /* Record the exact location where an expression or an identifier were
2873 annotate_with_file_line (tree node
, const char *file
, int line
)
2875 /* Roughly one percent of the calls to this function are to annotate
2876 a node with the same information already attached to that node!
2877 Just return instead of wasting memory. */
2878 if (EXPR_LOCUS (node
)
2879 && (EXPR_FILENAME (node
) == file
2880 || ! strcmp (EXPR_FILENAME (node
), file
))
2881 && EXPR_LINENO (node
) == line
)
2883 last_annotated_node
= node
;
2887 /* In heavily macroized code (such as GCC itself) this single
2888 entry cache can reduce the number of allocations by more
2890 if (last_annotated_node
2891 && EXPR_LOCUS (last_annotated_node
)
2892 && (EXPR_FILENAME (last_annotated_node
) == file
2893 || ! strcmp (EXPR_FILENAME (last_annotated_node
), file
))
2894 && EXPR_LINENO (last_annotated_node
) == line
)
2896 SET_EXPR_LOCUS (node
, EXPR_LOCUS (last_annotated_node
));
2900 SET_EXPR_LOCUS (node
, ggc_alloc (sizeof (location_t
)));
2901 EXPR_LINENO (node
) = line
;
2902 EXPR_FILENAME (node
) = file
;
2903 last_annotated_node
= node
;
2907 annotate_with_locus (tree node
, location_t locus
)
2909 annotate_with_file_line (node
, locus
.file
, locus
.line
);
2913 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
2917 build_decl_attribute_variant (tree ddecl
, tree attribute
)
2919 DECL_ATTRIBUTES (ddecl
) = attribute
;
2923 /* Borrowed from hashtab.c iterative_hash implementation. */
2924 #define mix(a,b,c) \
2926 a -= b; a -= c; a ^= (c>>13); \
2927 b -= c; b -= a; b ^= (a<< 8); \
2928 c -= a; c -= b; c ^= ((b&0xffffffff)>>13); \
2929 a -= b; a -= c; a ^= ((c&0xffffffff)>>12); \
2930 b -= c; b -= a; b = (b ^ (a<<16)) & 0xffffffff; \
2931 c -= a; c -= b; c = (c ^ (b>> 5)) & 0xffffffff; \
2932 a -= b; a -= c; a = (a ^ (c>> 3)) & 0xffffffff; \
2933 b -= c; b -= a; b = (b ^ (a<<10)) & 0xffffffff; \
2934 c -= a; c -= b; c = (c ^ (b>>15)) & 0xffffffff; \
2938 /* Produce good hash value combining VAL and VAL2. */
2939 static inline hashval_t
2940 iterative_hash_hashval_t (hashval_t val
, hashval_t val2
)
2942 /* the golden ratio; an arbitrary value. */
2943 hashval_t a
= 0x9e3779b9;
2949 /* Produce good hash value combining PTR and VAL2. */
2950 static inline hashval_t
2951 iterative_hash_pointer (void *ptr
, hashval_t val2
)
2953 if (sizeof (ptr
) == sizeof (hashval_t
))
2954 return iterative_hash_hashval_t ((size_t) ptr
, val2
);
2957 hashval_t a
= (hashval_t
) (size_t) ptr
;
2958 /* Avoid warnings about shifting of more than the width of the type on
2959 hosts that won't execute this path. */
2961 hashval_t b
= (hashval_t
) ((size_t) ptr
>> (sizeof (hashval_t
) * 8 + zero
));
2967 /* Produce good hash value combining VAL and VAL2. */
2968 static inline hashval_t
2969 iterative_hash_host_wide_int (HOST_WIDE_INT val
, hashval_t val2
)
2971 if (sizeof (HOST_WIDE_INT
) == sizeof (hashval_t
))
2972 return iterative_hash_hashval_t (val
, val2
);
2975 hashval_t a
= (hashval_t
) val
;
2976 /* Avoid warnings about shifting of more than the width of the type on
2977 hosts that won't execute this path. */
2979 hashval_t b
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 8 + zero
));
2981 if (sizeof (HOST_WIDE_INT
) > 2 * sizeof (hashval_t
))
2983 hashval_t a
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 16 + zero
));
2984 hashval_t b
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 24 + zero
));
2991 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
2994 Record such modified types already made so we don't make duplicates. */
2997 build_type_attribute_variant (tree ttype
, tree attribute
)
2999 if (! attribute_list_equal (TYPE_ATTRIBUTES (ttype
), attribute
))
3001 hashval_t hashcode
= 0;
3003 enum tree_code code
= TREE_CODE (ttype
);
3005 ntype
= copy_node (ttype
);
3007 TYPE_POINTER_TO (ntype
) = 0;
3008 TYPE_REFERENCE_TO (ntype
) = 0;
3009 TYPE_ATTRIBUTES (ntype
) = attribute
;
3011 /* Create a new main variant of TYPE. */
3012 TYPE_MAIN_VARIANT (ntype
) = ntype
;
3013 TYPE_NEXT_VARIANT (ntype
) = 0;
3014 set_type_quals (ntype
, TYPE_UNQUALIFIED
);
3016 hashcode
= iterative_hash_object (code
, hashcode
);
3017 if (TREE_TYPE (ntype
))
3018 hashcode
= iterative_hash_object (TYPE_HASH (TREE_TYPE (ntype
)),
3020 hashcode
= attribute_hash_list (attribute
, hashcode
);
3022 switch (TREE_CODE (ntype
))
3025 hashcode
= type_hash_list (TYPE_ARG_TYPES (ntype
), hashcode
);
3028 hashcode
= iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (ntype
)),
3032 hashcode
= iterative_hash_object
3033 (TREE_INT_CST_LOW (TYPE_MAX_VALUE (ntype
)), hashcode
);
3034 hashcode
= iterative_hash_object
3035 (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (ntype
)), hashcode
);
3039 unsigned int precision
= TYPE_PRECISION (ntype
);
3040 hashcode
= iterative_hash_object (precision
, hashcode
);
3047 ntype
= type_hash_canon (hashcode
, ntype
);
3048 ttype
= build_qualified_type (ntype
, TYPE_QUALS (ttype
));
3055 /* Return nonzero if IDENT is a valid name for attribute ATTR,
3058 We try both `text' and `__text__', ATTR may be either one. */
3059 /* ??? It might be a reasonable simplification to require ATTR to be only
3060 `text'. One might then also require attribute lists to be stored in
3061 their canonicalized form. */
3064 is_attribute_with_length_p (const char *attr
, int attr_len
, tree ident
)
3069 if (TREE_CODE (ident
) != IDENTIFIER_NODE
)
3072 p
= IDENTIFIER_POINTER (ident
);
3073 ident_len
= IDENTIFIER_LENGTH (ident
);
3075 if (ident_len
== attr_len
3076 && strcmp (attr
, p
) == 0)
3079 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
3082 gcc_assert (attr
[1] == '_');
3083 gcc_assert (attr
[attr_len
- 2] == '_');
3084 gcc_assert (attr
[attr_len
- 1] == '_');
3085 gcc_assert (attr
[1] == '_');
3086 if (ident_len
== attr_len
- 4
3087 && strncmp (attr
+ 2, p
, attr_len
- 4) == 0)
3092 if (ident_len
== attr_len
+ 4
3093 && p
[0] == '_' && p
[1] == '_'
3094 && p
[ident_len
- 2] == '_' && p
[ident_len
- 1] == '_'
3095 && strncmp (attr
, p
+ 2, attr_len
) == 0)
3102 /* Return nonzero if IDENT is a valid name for attribute ATTR,
3105 We try both `text' and `__text__', ATTR may be either one. */
3108 is_attribute_p (const char *attr
, tree ident
)
3110 return is_attribute_with_length_p (attr
, strlen (attr
), ident
);
3113 /* Given an attribute name and a list of attributes, return a pointer to the
3114 attribute's list element if the attribute is part of the list, or NULL_TREE
3115 if not found. If the attribute appears more than once, this only
3116 returns the first occurrence; the TREE_CHAIN of the return value should
3117 be passed back in if further occurrences are wanted. */
3120 lookup_attribute (const char *attr_name
, tree list
)
3123 size_t attr_len
= strlen (attr_name
);
3125 for (l
= list
; l
; l
= TREE_CHAIN (l
))
3127 gcc_assert (TREE_CODE (TREE_PURPOSE (l
)) == IDENTIFIER_NODE
);
3128 if (is_attribute_with_length_p (attr_name
, attr_len
, TREE_PURPOSE (l
)))
3135 /* Return an attribute list that is the union of a1 and a2. */
3138 merge_attributes (tree a1
, tree a2
)
3142 /* Either one unset? Take the set one. */
3144 if ((attributes
= a1
) == 0)
3147 /* One that completely contains the other? Take it. */
3149 else if (a2
!= 0 && ! attribute_list_contained (a1
, a2
))
3151 if (attribute_list_contained (a2
, a1
))
3155 /* Pick the longest list, and hang on the other list. */
3157 if (list_length (a1
) < list_length (a2
))
3158 attributes
= a2
, a2
= a1
;
3160 for (; a2
!= 0; a2
= TREE_CHAIN (a2
))
3163 for (a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
3166 a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
3169 if (simple_cst_equal (TREE_VALUE (a
), TREE_VALUE (a2
)) == 1)
3174 a1
= copy_node (a2
);
3175 TREE_CHAIN (a1
) = attributes
;
3184 /* Given types T1 and T2, merge their attributes and return
3188 merge_type_attributes (tree t1
, tree t2
)
3190 return merge_attributes (TYPE_ATTRIBUTES (t1
),
3191 TYPE_ATTRIBUTES (t2
));
3194 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
3198 merge_decl_attributes (tree olddecl
, tree newdecl
)
3200 return merge_attributes (DECL_ATTRIBUTES (olddecl
),
3201 DECL_ATTRIBUTES (newdecl
));
3204 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
3206 /* Specialization of merge_decl_attributes for various Windows targets.
3208 This handles the following situation:
3210 __declspec (dllimport) int foo;
3213 The second instance of `foo' nullifies the dllimport. */
3216 merge_dllimport_decl_attributes (tree old
, tree
new)
3219 int delete_dllimport_p
;
3221 old
= DECL_ATTRIBUTES (old
);
3222 new = DECL_ATTRIBUTES (new);
3224 /* What we need to do here is remove from `old' dllimport if it doesn't
3225 appear in `new'. dllimport behaves like extern: if a declaration is
3226 marked dllimport and a definition appears later, then the object
3227 is not dllimport'd. */
3228 if (lookup_attribute ("dllimport", old
) != NULL_TREE
3229 && lookup_attribute ("dllimport", new) == NULL_TREE
)
3230 delete_dllimport_p
= 1;
3232 delete_dllimport_p
= 0;
3234 a
= merge_attributes (old
, new);
3236 if (delete_dllimport_p
)
3240 /* Scan the list for dllimport and delete it. */
3241 for (prev
= NULL_TREE
, t
= a
; t
; prev
= t
, t
= TREE_CHAIN (t
))
3243 if (is_attribute_p ("dllimport", TREE_PURPOSE (t
)))
3245 if (prev
== NULL_TREE
)
3248 TREE_CHAIN (prev
) = TREE_CHAIN (t
);
3257 /* Handle a "dllimport" or "dllexport" attribute; arguments as in
3258 struct attribute_spec.handler. */
3261 handle_dll_attribute (tree
* pnode
, tree name
, tree args
, int flags
,
3266 /* These attributes may apply to structure and union types being created,
3267 but otherwise should pass to the declaration involved. */
3270 if (flags
& ((int) ATTR_FLAG_DECL_NEXT
| (int) ATTR_FLAG_FUNCTION_NEXT
3271 | (int) ATTR_FLAG_ARRAY_NEXT
))
3273 *no_add_attrs
= true;
3274 return tree_cons (name
, args
, NULL_TREE
);
3276 if (TREE_CODE (node
) != RECORD_TYPE
&& TREE_CODE (node
) != UNION_TYPE
)
3278 warning (0, "%qs attribute ignored", IDENTIFIER_POINTER (name
));
3279 *no_add_attrs
= true;
3285 /* Report error on dllimport ambiguities seen now before they cause
3287 if (is_attribute_p ("dllimport", name
))
3289 /* Like MS, treat definition of dllimported variables and
3290 non-inlined functions on declaration as syntax errors. We
3291 allow the attribute for function definitions if declared
3293 if (TREE_CODE (node
) == FUNCTION_DECL
&& DECL_INITIAL (node
)
3294 && !DECL_DECLARED_INLINE_P (node
))
3296 error ("%Jfunction %qD definition is marked dllimport.", node
, node
);
3297 *no_add_attrs
= true;
3300 else if (TREE_CODE (node
) == VAR_DECL
)
3302 if (DECL_INITIAL (node
))
3304 error ("%Jvariable %qD definition is marked dllimport.",
3306 *no_add_attrs
= true;
3309 /* `extern' needn't be specified with dllimport.
3310 Specify `extern' now and hope for the best. Sigh. */
3311 DECL_EXTERNAL (node
) = 1;
3312 /* Also, implicitly give dllimport'd variables declared within
3313 a function global scope, unless declared static. */
3314 if (current_function_decl
!= NULL_TREE
&& !TREE_STATIC (node
))
3315 TREE_PUBLIC (node
) = 1;
3319 /* Report error if symbol is not accessible at global scope. */
3320 if (!TREE_PUBLIC (node
)
3321 && (TREE_CODE (node
) == VAR_DECL
3322 || TREE_CODE (node
) == FUNCTION_DECL
))
3324 error ("%Jexternal linkage required for symbol %qD because of "
3325 "%qs attribute.", node
, node
, IDENTIFIER_POINTER (name
));
3326 *no_add_attrs
= true;
3332 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
3334 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
3335 of the various TYPE_QUAL values. */
3338 set_type_quals (tree type
, int type_quals
)
3340 TYPE_READONLY (type
) = (type_quals
& TYPE_QUAL_CONST
) != 0;
3341 TYPE_VOLATILE (type
) = (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
3342 TYPE_RESTRICT (type
) = (type_quals
& TYPE_QUAL_RESTRICT
) != 0;
3345 /* Returns true iff cand is equivalent to base with type_quals. */
3348 check_qualified_type (tree cand
, tree base
, int type_quals
)
3350 return (TYPE_QUALS (cand
) == type_quals
3351 && TYPE_NAME (cand
) == TYPE_NAME (base
)
3352 /* Apparently this is needed for Objective-C. */
3353 && TYPE_CONTEXT (cand
) == TYPE_CONTEXT (base
)
3354 && attribute_list_equal (TYPE_ATTRIBUTES (cand
),
3355 TYPE_ATTRIBUTES (base
)));
3358 /* Return a version of the TYPE, qualified as indicated by the
3359 TYPE_QUALS, if one exists. If no qualified version exists yet,
3360 return NULL_TREE. */
3363 get_qualified_type (tree type
, int type_quals
)
3367 if (TYPE_QUALS (type
) == type_quals
)
3370 /* Search the chain of variants to see if there is already one there just
3371 like the one we need to have. If so, use that existing one. We must
3372 preserve the TYPE_NAME, since there is code that depends on this. */
3373 for (t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
3374 if (check_qualified_type (t
, type
, type_quals
))
3380 /* Like get_qualified_type, but creates the type if it does not
3381 exist. This function never returns NULL_TREE. */
3384 build_qualified_type (tree type
, int type_quals
)
3388 /* See if we already have the appropriate qualified variant. */
3389 t
= get_qualified_type (type
, type_quals
);
3391 /* If not, build it. */
3394 t
= build_variant_type_copy (type
);
3395 set_type_quals (t
, type_quals
);
3401 /* Create a new distinct copy of TYPE. The new type is made its own
3405 build_distinct_type_copy (tree type
)
3407 tree t
= copy_node (type
);
3409 TYPE_POINTER_TO (t
) = 0;
3410 TYPE_REFERENCE_TO (t
) = 0;
3412 /* Make it its own variant. */
3413 TYPE_MAIN_VARIANT (t
) = t
;
3414 TYPE_NEXT_VARIANT (t
) = 0;
3419 /* Create a new variant of TYPE, equivalent but distinct.
3420 This is so the caller can modify it. */
3423 build_variant_type_copy (tree type
)
3425 tree t
, m
= TYPE_MAIN_VARIANT (type
);
3427 t
= build_distinct_type_copy (type
);
3429 /* Add the new type to the chain of variants of TYPE. */
3430 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (m
);
3431 TYPE_NEXT_VARIANT (m
) = t
;
3432 TYPE_MAIN_VARIANT (t
) = m
;
3437 /* Hashing of types so that we don't make duplicates.
3438 The entry point is `type_hash_canon'. */
3440 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
3441 with types in the TREE_VALUE slots), by adding the hash codes
3442 of the individual types. */
3445 type_hash_list (tree list
, hashval_t hashcode
)
3449 for (tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3450 if (TREE_VALUE (tail
) != error_mark_node
)
3451 hashcode
= iterative_hash_object (TYPE_HASH (TREE_VALUE (tail
)),
3457 /* These are the Hashtable callback functions. */
3459 /* Returns true iff the types are equivalent. */
3462 type_hash_eq (const void *va
, const void *vb
)
3464 const struct type_hash
*a
= va
, *b
= vb
;
3466 /* First test the things that are the same for all types. */
3467 if (a
->hash
!= b
->hash
3468 || TREE_CODE (a
->type
) != TREE_CODE (b
->type
)
3469 || TREE_TYPE (a
->type
) != TREE_TYPE (b
->type
)
3470 || !attribute_list_equal (TYPE_ATTRIBUTES (a
->type
),
3471 TYPE_ATTRIBUTES (b
->type
))
3472 || TYPE_ALIGN (a
->type
) != TYPE_ALIGN (b
->type
)
3473 || TYPE_MODE (a
->type
) != TYPE_MODE (b
->type
))
3476 switch (TREE_CODE (a
->type
))
3481 case REFERENCE_TYPE
:
3485 return TYPE_VECTOR_SUBPARTS (a
->type
) == TYPE_VECTOR_SUBPARTS (b
->type
);
3488 if (TYPE_VALUES (a
->type
) != TYPE_VALUES (b
->type
)
3489 && !(TYPE_VALUES (a
->type
)
3490 && TREE_CODE (TYPE_VALUES (a
->type
)) == TREE_LIST
3491 && TYPE_VALUES (b
->type
)
3492 && TREE_CODE (TYPE_VALUES (b
->type
)) == TREE_LIST
3493 && type_list_equal (TYPE_VALUES (a
->type
),
3494 TYPE_VALUES (b
->type
))))
3497 /* ... fall through ... */
3503 return ((TYPE_MAX_VALUE (a
->type
) == TYPE_MAX_VALUE (b
->type
)
3504 || tree_int_cst_equal (TYPE_MAX_VALUE (a
->type
),
3505 TYPE_MAX_VALUE (b
->type
)))
3506 && (TYPE_MIN_VALUE (a
->type
) == TYPE_MIN_VALUE (b
->type
)
3507 || tree_int_cst_equal (TYPE_MIN_VALUE (a
->type
),
3508 TYPE_MIN_VALUE (b
->type
))));
3511 return TYPE_OFFSET_BASETYPE (a
->type
) == TYPE_OFFSET_BASETYPE (b
->type
);
3514 return (TYPE_METHOD_BASETYPE (a
->type
) == TYPE_METHOD_BASETYPE (b
->type
)
3515 && (TYPE_ARG_TYPES (a
->type
) == TYPE_ARG_TYPES (b
->type
)
3516 || (TYPE_ARG_TYPES (a
->type
)
3517 && TREE_CODE (TYPE_ARG_TYPES (a
->type
)) == TREE_LIST
3518 && TYPE_ARG_TYPES (b
->type
)
3519 && TREE_CODE (TYPE_ARG_TYPES (b
->type
)) == TREE_LIST
3520 && type_list_equal (TYPE_ARG_TYPES (a
->type
),
3521 TYPE_ARG_TYPES (b
->type
)))));
3524 return TYPE_DOMAIN (a
->type
) == TYPE_DOMAIN (b
->type
);
3528 case QUAL_UNION_TYPE
:
3529 return (TYPE_FIELDS (a
->type
) == TYPE_FIELDS (b
->type
)
3530 || (TYPE_FIELDS (a
->type
)
3531 && TREE_CODE (TYPE_FIELDS (a
->type
)) == TREE_LIST
3532 && TYPE_FIELDS (b
->type
)
3533 && TREE_CODE (TYPE_FIELDS (b
->type
)) == TREE_LIST
3534 && type_list_equal (TYPE_FIELDS (a
->type
),
3535 TYPE_FIELDS (b
->type
))));
3538 return (TYPE_ARG_TYPES (a
->type
) == TYPE_ARG_TYPES (b
->type
)
3539 || (TYPE_ARG_TYPES (a
->type
)
3540 && TREE_CODE (TYPE_ARG_TYPES (a
->type
)) == TREE_LIST
3541 && TYPE_ARG_TYPES (b
->type
)
3542 && TREE_CODE (TYPE_ARG_TYPES (b
->type
)) == TREE_LIST
3543 && type_list_equal (TYPE_ARG_TYPES (a
->type
),
3544 TYPE_ARG_TYPES (b
->type
))));
3551 /* Return the cached hash value. */
3554 type_hash_hash (const void *item
)
3556 return ((const struct type_hash
*) item
)->hash
;
3559 /* Look in the type hash table for a type isomorphic to TYPE.
3560 If one is found, return it. Otherwise return 0. */
3563 type_hash_lookup (hashval_t hashcode
, tree type
)
3565 struct type_hash
*h
, in
;
3567 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
3568 must call that routine before comparing TYPE_ALIGNs. */
3574 h
= htab_find_with_hash (type_hash_table
, &in
, hashcode
);
3580 /* Add an entry to the type-hash-table
3581 for a type TYPE whose hash code is HASHCODE. */
3584 type_hash_add (hashval_t hashcode
, tree type
)
3586 struct type_hash
*h
;
3589 h
= ggc_alloc (sizeof (struct type_hash
));
3592 loc
= htab_find_slot_with_hash (type_hash_table
, h
, hashcode
, INSERT
);
3593 *(struct type_hash
**) loc
= h
;
3596 /* Given TYPE, and HASHCODE its hash code, return the canonical
3597 object for an identical type if one already exists.
3598 Otherwise, return TYPE, and record it as the canonical object.
3600 To use this function, first create a type of the sort you want.
3601 Then compute its hash code from the fields of the type that
3602 make it different from other similar types.
3603 Then call this function and use the value. */
3606 type_hash_canon (unsigned int hashcode
, tree type
)
3610 /* The hash table only contains main variants, so ensure that's what we're
3612 gcc_assert (TYPE_MAIN_VARIANT (type
) == type
);
3614 if (!lang_hooks
.types
.hash_types
)
3617 /* See if the type is in the hash table already. If so, return it.
3618 Otherwise, add the type. */
3619 t1
= type_hash_lookup (hashcode
, type
);
3622 #ifdef GATHER_STATISTICS
3623 tree_node_counts
[(int) t_kind
]--;
3624 tree_node_sizes
[(int) t_kind
] -= sizeof (struct tree_type
);
3630 type_hash_add (hashcode
, type
);
3635 /* See if the data pointed to by the type hash table is marked. We consider
3636 it marked if the type is marked or if a debug type number or symbol
3637 table entry has been made for the type. This reduces the amount of
3638 debugging output and eliminates that dependency of the debug output on
3639 the number of garbage collections. */
3642 type_hash_marked_p (const void *p
)
3644 tree type
= ((struct type_hash
*) p
)->type
;
3646 return ggc_marked_p (type
) || TYPE_SYMTAB_POINTER (type
);
3650 print_type_hash_statistics (void)
3652 fprintf (stderr
, "Type hash: size %ld, %ld elements, %f collisions\n",
3653 (long) htab_size (type_hash_table
),
3654 (long) htab_elements (type_hash_table
),
3655 htab_collisions (type_hash_table
));
3658 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
3659 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
3660 by adding the hash codes of the individual attributes. */
3663 attribute_hash_list (tree list
, hashval_t hashcode
)
3667 for (tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3668 /* ??? Do we want to add in TREE_VALUE too? */
3669 hashcode
= iterative_hash_object
3670 (IDENTIFIER_HASH_VALUE (TREE_PURPOSE (tail
)), hashcode
);
3674 /* Given two lists of attributes, return true if list l2 is
3675 equivalent to l1. */
3678 attribute_list_equal (tree l1
, tree l2
)
3680 return attribute_list_contained (l1
, l2
)
3681 && attribute_list_contained (l2
, l1
);
3684 /* Given two lists of attributes, return true if list L2 is
3685 completely contained within L1. */
3686 /* ??? This would be faster if attribute names were stored in a canonicalized
3687 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
3688 must be used to show these elements are equivalent (which they are). */
3689 /* ??? It's not clear that attributes with arguments will always be handled
3693 attribute_list_contained (tree l1
, tree l2
)
3697 /* First check the obvious, maybe the lists are identical. */
3701 /* Maybe the lists are similar. */
3702 for (t1
= l1
, t2
= l2
;
3704 && TREE_PURPOSE (t1
) == TREE_PURPOSE (t2
)
3705 && TREE_VALUE (t1
) == TREE_VALUE (t2
);
3706 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
));
3708 /* Maybe the lists are equal. */
3709 if (t1
== 0 && t2
== 0)
3712 for (; t2
!= 0; t2
= TREE_CHAIN (t2
))
3715 for (attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)), l1
);
3717 attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)),
3720 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) == 1)
3727 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) != 1)
3734 /* Given two lists of types
3735 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
3736 return 1 if the lists contain the same types in the same order.
3737 Also, the TREE_PURPOSEs must match. */
3740 type_list_equal (tree l1
, tree l2
)
3744 for (t1
= l1
, t2
= l2
; t1
&& t2
; t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
3745 if (TREE_VALUE (t1
) != TREE_VALUE (t2
)
3746 || (TREE_PURPOSE (t1
) != TREE_PURPOSE (t2
)
3747 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1
), TREE_PURPOSE (t2
))
3748 && (TREE_TYPE (TREE_PURPOSE (t1
))
3749 == TREE_TYPE (TREE_PURPOSE (t2
))))))
3755 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
3756 given by TYPE. If the argument list accepts variable arguments,
3757 then this function counts only the ordinary arguments. */
3760 type_num_arguments (tree type
)
3765 for (t
= TYPE_ARG_TYPES (type
); t
; t
= TREE_CHAIN (t
))
3766 /* If the function does not take a variable number of arguments,
3767 the last element in the list will have type `void'. */
3768 if (VOID_TYPE_P (TREE_VALUE (t
)))
3776 /* Nonzero if integer constants T1 and T2
3777 represent the same constant value. */
3780 tree_int_cst_equal (tree t1
, tree t2
)
3785 if (t1
== 0 || t2
== 0)
3788 if (TREE_CODE (t1
) == INTEGER_CST
3789 && TREE_CODE (t2
) == INTEGER_CST
3790 && TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
3791 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
))
3797 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
3798 The precise way of comparison depends on their data type. */
3801 tree_int_cst_lt (tree t1
, tree t2
)
3806 if (TYPE_UNSIGNED (TREE_TYPE (t1
)) != TYPE_UNSIGNED (TREE_TYPE (t2
)))
3808 int t1_sgn
= tree_int_cst_sgn (t1
);
3809 int t2_sgn
= tree_int_cst_sgn (t2
);
3811 if (t1_sgn
< t2_sgn
)
3813 else if (t1_sgn
> t2_sgn
)
3815 /* Otherwise, both are non-negative, so we compare them as
3816 unsigned just in case one of them would overflow a signed
3819 else if (!TYPE_UNSIGNED (TREE_TYPE (t1
)))
3820 return INT_CST_LT (t1
, t2
);
3822 return INT_CST_LT_UNSIGNED (t1
, t2
);
3825 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
3828 tree_int_cst_compare (tree t1
, tree t2
)
3830 if (tree_int_cst_lt (t1
, t2
))
3832 else if (tree_int_cst_lt (t2
, t1
))
3838 /* Return 1 if T is an INTEGER_CST that can be manipulated efficiently on
3839 the host. If POS is zero, the value can be represented in a single
3840 HOST_WIDE_INT. If POS is nonzero, the value must be positive and can
3841 be represented in a single unsigned HOST_WIDE_INT. */
3844 host_integerp (tree t
, int pos
)
3846 return (TREE_CODE (t
) == INTEGER_CST
3847 && ! TREE_OVERFLOW (t
)
3848 && ((TREE_INT_CST_HIGH (t
) == 0
3849 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) >= 0)
3850 || (! pos
&& TREE_INT_CST_HIGH (t
) == -1
3851 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0
3852 && !TYPE_UNSIGNED (TREE_TYPE (t
)))
3853 || (pos
&& TREE_INT_CST_HIGH (t
) == 0)));
3856 /* Return the HOST_WIDE_INT least significant bits of T if it is an
3857 INTEGER_CST and there is no overflow. POS is nonzero if the result must
3858 be positive. We must be able to satisfy the above conditions. */
3861 tree_low_cst (tree t
, int pos
)
3863 gcc_assert (host_integerp (t
, pos
));
3864 return TREE_INT_CST_LOW (t
);
3867 /* Return the most significant bit of the integer constant T. */
3870 tree_int_cst_msb (tree t
)
3874 unsigned HOST_WIDE_INT l
;
3876 /* Note that using TYPE_PRECISION here is wrong. We care about the
3877 actual bits, not the (arbitrary) range of the type. */
3878 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t
))) - 1;
3879 rshift_double (TREE_INT_CST_LOW (t
), TREE_INT_CST_HIGH (t
), prec
,
3880 2 * HOST_BITS_PER_WIDE_INT
, &l
, &h
, 0);
3881 return (l
& 1) == 1;
3884 /* Return an indication of the sign of the integer constant T.
3885 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
3886 Note that -1 will never be returned it T's type is unsigned. */
3889 tree_int_cst_sgn (tree t
)
3891 if (TREE_INT_CST_LOW (t
) == 0 && TREE_INT_CST_HIGH (t
) == 0)
3893 else if (TYPE_UNSIGNED (TREE_TYPE (t
)))
3895 else if (TREE_INT_CST_HIGH (t
) < 0)
3901 /* Compare two constructor-element-type constants. Return 1 if the lists
3902 are known to be equal; otherwise return 0. */
3905 simple_cst_list_equal (tree l1
, tree l2
)
3907 while (l1
!= NULL_TREE
&& l2
!= NULL_TREE
)
3909 if (simple_cst_equal (TREE_VALUE (l1
), TREE_VALUE (l2
)) != 1)
3912 l1
= TREE_CHAIN (l1
);
3913 l2
= TREE_CHAIN (l2
);
3919 /* Return truthvalue of whether T1 is the same tree structure as T2.
3920 Return 1 if they are the same.
3921 Return 0 if they are understandably different.
3922 Return -1 if either contains tree structure not understood by
3926 simple_cst_equal (tree t1
, tree t2
)
3928 enum tree_code code1
, code2
;
3934 if (t1
== 0 || t2
== 0)
3937 code1
= TREE_CODE (t1
);
3938 code2
= TREE_CODE (t2
);
3940 if (code1
== NOP_EXPR
|| code1
== CONVERT_EXPR
|| code1
== NON_LVALUE_EXPR
)
3942 if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
3943 || code2
== NON_LVALUE_EXPR
)
3944 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3946 return simple_cst_equal (TREE_OPERAND (t1
, 0), t2
);
3949 else if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
3950 || code2
== NON_LVALUE_EXPR
)
3951 return simple_cst_equal (t1
, TREE_OPERAND (t2
, 0));
3959 return (TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
3960 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
));
3963 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3966 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3967 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3968 TREE_STRING_LENGTH (t1
)));
3971 return simple_cst_list_equal (CONSTRUCTOR_ELTS (t1
),
3972 CONSTRUCTOR_ELTS (t2
));
3975 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3978 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3982 simple_cst_list_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
3985 /* Special case: if either target is an unallocated VAR_DECL,
3986 it means that it's going to be unified with whatever the
3987 TARGET_EXPR is really supposed to initialize, so treat it
3988 as being equivalent to anything. */
3989 if ((TREE_CODE (TREE_OPERAND (t1
, 0)) == VAR_DECL
3990 && DECL_NAME (TREE_OPERAND (t1
, 0)) == NULL_TREE
3991 && !DECL_RTL_SET_P (TREE_OPERAND (t1
, 0)))
3992 || (TREE_CODE (TREE_OPERAND (t2
, 0)) == VAR_DECL
3993 && DECL_NAME (TREE_OPERAND (t2
, 0)) == NULL_TREE
3994 && !DECL_RTL_SET_P (TREE_OPERAND (t2
, 0))))
3997 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
4002 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
4004 case WITH_CLEANUP_EXPR
:
4005 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
4009 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t1
, 1));
4012 if (TREE_OPERAND (t1
, 1) == TREE_OPERAND (t2
, 1))
4013 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
4027 /* This general rule works for most tree codes. All exceptions should be
4028 handled above. If this is a language-specific tree code, we can't
4029 trust what might be in the operand, so say we don't know
4031 if ((int) code1
>= (int) LAST_AND_UNUSED_TREE_CODE
)
4034 switch (TREE_CODE_CLASS (code1
))
4038 case tcc_comparison
:
4039 case tcc_expression
:
4043 for (i
= 0; i
< TREE_CODE_LENGTH (code1
); i
++)
4045 cmp
= simple_cst_equal (TREE_OPERAND (t1
, i
), TREE_OPERAND (t2
, i
));
4057 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
4058 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
4059 than U, respectively. */
4062 compare_tree_int (tree t
, unsigned HOST_WIDE_INT u
)
4064 if (tree_int_cst_sgn (t
) < 0)
4066 else if (TREE_INT_CST_HIGH (t
) != 0)
4068 else if (TREE_INT_CST_LOW (t
) == u
)
4070 else if (TREE_INT_CST_LOW (t
) < u
)
4076 /* Return true if CODE represents an associative tree code. Otherwise
4079 associative_tree_code (enum tree_code code
)
4098 /* Return true if CODE represents a commutative tree code. Otherwise
4101 commutative_tree_code (enum tree_code code
)
4114 case UNORDERED_EXPR
:
4118 case TRUTH_AND_EXPR
:
4119 case TRUTH_XOR_EXPR
:
4129 /* Generate a hash value for an expression. This can be used iteratively
4130 by passing a previous result as the "val" argument.
4132 This function is intended to produce the same hash for expressions which
4133 would compare equal using operand_equal_p. */
4136 iterative_hash_expr (tree t
, hashval_t val
)
4139 enum tree_code code
;
4143 return iterative_hash_pointer (t
, val
);
4145 code
= TREE_CODE (t
);
4149 /* Alas, constants aren't shared, so we can't rely on pointer
4152 val
= iterative_hash_host_wide_int (TREE_INT_CST_LOW (t
), val
);
4153 return iterative_hash_host_wide_int (TREE_INT_CST_HIGH (t
), val
);
4156 unsigned int val2
= real_hash (TREE_REAL_CST_PTR (t
));
4158 return iterative_hash_hashval_t (val2
, val
);
4161 return iterative_hash (TREE_STRING_POINTER (t
),
4162 TREE_STRING_LENGTH (t
), val
);
4164 val
= iterative_hash_expr (TREE_REALPART (t
), val
);
4165 return iterative_hash_expr (TREE_IMAGPART (t
), val
);
4167 return iterative_hash_expr (TREE_VECTOR_CST_ELTS (t
), val
);
4171 /* we can just compare by pointer. */
4172 return iterative_hash_pointer (t
, val
);
4175 /* A list of expressions, for a CALL_EXPR or as the elements of a
4177 for (; t
; t
= TREE_CHAIN (t
))
4178 val
= iterative_hash_expr (TREE_VALUE (t
), val
);
4181 /* When referring to a built-in FUNCTION_DECL, use the
4182 __builtin__ form. Otherwise nodes that compare equal
4183 according to operand_equal_p might get different
4185 if (DECL_BUILT_IN (t
))
4187 val
= iterative_hash_pointer (built_in_decls
[DECL_FUNCTION_CODE (t
)],
4191 /* else FALL THROUGH */
4193 class = TREE_CODE_CLASS (code
);
4195 if (class == tcc_declaration
)
4197 /* Otherwise, we can just compare decls by pointer. */
4198 val
= iterative_hash_pointer (t
, val
);
4202 gcc_assert (IS_EXPR_CODE_CLASS (class));
4204 val
= iterative_hash_object (code
, val
);
4206 /* Don't hash the type, that can lead to having nodes which
4207 compare equal according to operand_equal_p, but which
4208 have different hash codes. */
4209 if (code
== NOP_EXPR
4210 || code
== CONVERT_EXPR
4211 || code
== NON_LVALUE_EXPR
)
4213 /* Make sure to include signness in the hash computation. */
4214 val
+= TYPE_UNSIGNED (TREE_TYPE (t
));
4215 val
= iterative_hash_expr (TREE_OPERAND (t
, 0), val
);
4218 else if (commutative_tree_code (code
))
4220 /* It's a commutative expression. We want to hash it the same
4221 however it appears. We do this by first hashing both operands
4222 and then rehashing based on the order of their independent
4224 hashval_t one
= iterative_hash_expr (TREE_OPERAND (t
, 0), 0);
4225 hashval_t two
= iterative_hash_expr (TREE_OPERAND (t
, 1), 0);
4229 t
= one
, one
= two
, two
= t
;
4231 val
= iterative_hash_hashval_t (one
, val
);
4232 val
= iterative_hash_hashval_t (two
, val
);
4235 for (i
= TREE_CODE_LENGTH (code
) - 1; i
>= 0; --i
)
4236 val
= iterative_hash_expr (TREE_OPERAND (t
, i
), val
);
4243 /* Constructors for pointer, array and function types.
4244 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
4245 constructed by language-dependent code, not here.) */
4247 /* Construct, lay out and return the type of pointers to TO_TYPE with
4248 mode MODE. If CAN_ALIAS_ALL is TRUE, indicate this type can
4249 reference all of memory. If such a type has already been
4250 constructed, reuse it. */
4253 build_pointer_type_for_mode (tree to_type
, enum machine_mode mode
,
4258 /* In some cases, languages will have things that aren't a POINTER_TYPE
4259 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_POINTER_TO.
4260 In that case, return that type without regard to the rest of our
4263 ??? This is a kludge, but consistent with the way this function has
4264 always operated and there doesn't seem to be a good way to avoid this
4266 if (TYPE_POINTER_TO (to_type
) != 0
4267 && TREE_CODE (TYPE_POINTER_TO (to_type
)) != POINTER_TYPE
)
4268 return TYPE_POINTER_TO (to_type
);
4270 /* First, if we already have a type for pointers to TO_TYPE and it's
4271 the proper mode, use it. */
4272 for (t
= TYPE_POINTER_TO (to_type
); t
; t
= TYPE_NEXT_PTR_TO (t
))
4273 if (TYPE_MODE (t
) == mode
&& TYPE_REF_CAN_ALIAS_ALL (t
) == can_alias_all
)
4276 t
= make_node (POINTER_TYPE
);
4278 TREE_TYPE (t
) = to_type
;
4279 TYPE_MODE (t
) = mode
;
4280 TYPE_REF_CAN_ALIAS_ALL (t
) = can_alias_all
;
4281 TYPE_NEXT_PTR_TO (t
) = TYPE_POINTER_TO (to_type
);
4282 TYPE_POINTER_TO (to_type
) = t
;
4284 /* Lay out the type. This function has many callers that are concerned
4285 with expression-construction, and this simplifies them all. */
4291 /* By default build pointers in ptr_mode. */
4294 build_pointer_type (tree to_type
)
4296 return build_pointer_type_for_mode (to_type
, ptr_mode
, false);
4299 /* Same as build_pointer_type_for_mode, but for REFERENCE_TYPE. */
4302 build_reference_type_for_mode (tree to_type
, enum machine_mode mode
,
4307 /* In some cases, languages will have things that aren't a REFERENCE_TYPE
4308 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_REFERENCE_TO.
4309 In that case, return that type without regard to the rest of our
4312 ??? This is a kludge, but consistent with the way this function has
4313 always operated and there doesn't seem to be a good way to avoid this
4315 if (TYPE_REFERENCE_TO (to_type
) != 0
4316 && TREE_CODE (TYPE_REFERENCE_TO (to_type
)) != REFERENCE_TYPE
)
4317 return TYPE_REFERENCE_TO (to_type
);
4319 /* First, if we already have a type for pointers to TO_TYPE and it's
4320 the proper mode, use it. */
4321 for (t
= TYPE_REFERENCE_TO (to_type
); t
; t
= TYPE_NEXT_REF_TO (t
))
4322 if (TYPE_MODE (t
) == mode
&& TYPE_REF_CAN_ALIAS_ALL (t
) == can_alias_all
)
4325 t
= make_node (REFERENCE_TYPE
);
4327 TREE_TYPE (t
) = to_type
;
4328 TYPE_MODE (t
) = mode
;
4329 TYPE_REF_CAN_ALIAS_ALL (t
) = can_alias_all
;
4330 TYPE_NEXT_REF_TO (t
) = TYPE_REFERENCE_TO (to_type
);
4331 TYPE_REFERENCE_TO (to_type
) = t
;
4339 /* Build the node for the type of references-to-TO_TYPE by default
4343 build_reference_type (tree to_type
)
4345 return build_reference_type_for_mode (to_type
, ptr_mode
, false);
4348 /* Build a type that is compatible with t but has no cv quals anywhere
4351 const char *const *const * -> char ***. */
4354 build_type_no_quals (tree t
)
4356 switch (TREE_CODE (t
))
4359 return build_pointer_type_for_mode (build_type_no_quals (TREE_TYPE (t
)),
4361 TYPE_REF_CAN_ALIAS_ALL (t
));
4362 case REFERENCE_TYPE
:
4364 build_reference_type_for_mode (build_type_no_quals (TREE_TYPE (t
)),
4366 TYPE_REF_CAN_ALIAS_ALL (t
));
4368 return TYPE_MAIN_VARIANT (t
);
4372 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
4373 MAXVAL should be the maximum value in the domain
4374 (one less than the length of the array).
4376 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
4377 We don't enforce this limit, that is up to caller (e.g. language front end).
4378 The limit exists because the result is a signed type and we don't handle
4379 sizes that use more than one HOST_WIDE_INT. */
4382 build_index_type (tree maxval
)
4384 tree itype
= make_node (INTEGER_TYPE
);
4386 TREE_TYPE (itype
) = sizetype
;
4387 TYPE_PRECISION (itype
) = TYPE_PRECISION (sizetype
);
4388 TYPE_MIN_VALUE (itype
) = size_zero_node
;
4389 TYPE_MAX_VALUE (itype
) = fold_convert (sizetype
, maxval
);
4390 TYPE_MODE (itype
) = TYPE_MODE (sizetype
);
4391 TYPE_SIZE (itype
) = TYPE_SIZE (sizetype
);
4392 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (sizetype
);
4393 TYPE_ALIGN (itype
) = TYPE_ALIGN (sizetype
);
4394 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (sizetype
);
4396 if (host_integerp (maxval
, 1))
4397 return type_hash_canon (tree_low_cst (maxval
, 1), itype
);
4402 /* Builds a signed or unsigned integer type of precision PRECISION.
4403 Used for C bitfields whose precision does not match that of
4404 built-in target types. */
4406 build_nonstandard_integer_type (unsigned HOST_WIDE_INT precision
,
4409 tree itype
= make_node (INTEGER_TYPE
);
4411 TYPE_PRECISION (itype
) = precision
;
4414 fixup_unsigned_type (itype
);
4416 fixup_signed_type (itype
);
4418 if (host_integerp (TYPE_MAX_VALUE (itype
), 1))
4419 return type_hash_canon (tree_low_cst (TYPE_MAX_VALUE (itype
), 1), itype
);
4424 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
4425 ENUMERAL_TYPE, BOOLEAN_TYPE, or CHAR_TYPE), with
4426 low bound LOWVAL and high bound HIGHVAL.
4427 if TYPE==NULL_TREE, sizetype is used. */
4430 build_range_type (tree type
, tree lowval
, tree highval
)
4432 tree itype
= make_node (INTEGER_TYPE
);
4434 TREE_TYPE (itype
) = type
;
4435 if (type
== NULL_TREE
)
4438 TYPE_MIN_VALUE (itype
) = convert (type
, lowval
);
4439 TYPE_MAX_VALUE (itype
) = highval
? convert (type
, highval
) : NULL
;
4441 TYPE_PRECISION (itype
) = TYPE_PRECISION (type
);
4442 TYPE_MODE (itype
) = TYPE_MODE (type
);
4443 TYPE_SIZE (itype
) = TYPE_SIZE (type
);
4444 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (type
);
4445 TYPE_ALIGN (itype
) = TYPE_ALIGN (type
);
4446 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (type
);
4448 if (host_integerp (lowval
, 0) && highval
!= 0 && host_integerp (highval
, 0))
4449 return type_hash_canon (tree_low_cst (highval
, 0)
4450 - tree_low_cst (lowval
, 0),
4456 /* Just like build_index_type, but takes lowval and highval instead
4457 of just highval (maxval). */
4460 build_index_2_type (tree lowval
, tree highval
)
4462 return build_range_type (sizetype
, lowval
, highval
);
4465 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
4466 and number of elements specified by the range of values of INDEX_TYPE.
4467 If such a type has already been constructed, reuse it. */
4470 build_array_type (tree elt_type
, tree index_type
)
4473 hashval_t hashcode
= 0;
4475 if (TREE_CODE (elt_type
) == FUNCTION_TYPE
)
4477 error ("arrays of functions are not meaningful");
4478 elt_type
= integer_type_node
;
4481 t
= make_node (ARRAY_TYPE
);
4482 TREE_TYPE (t
) = elt_type
;
4483 TYPE_DOMAIN (t
) = index_type
;
4485 if (index_type
== 0)
4491 hashcode
= iterative_hash_object (TYPE_HASH (elt_type
), hashcode
);
4492 hashcode
= iterative_hash_object (TYPE_HASH (index_type
), hashcode
);
4493 t
= type_hash_canon (hashcode
, t
);
4495 if (!COMPLETE_TYPE_P (t
))
4500 /* Return the TYPE of the elements comprising
4501 the innermost dimension of ARRAY. */
4504 get_inner_array_type (tree array
)
4506 tree type
= TREE_TYPE (array
);
4508 while (TREE_CODE (type
) == ARRAY_TYPE
)
4509 type
= TREE_TYPE (type
);
4514 /* Construct, lay out and return
4515 the type of functions returning type VALUE_TYPE
4516 given arguments of types ARG_TYPES.
4517 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
4518 are data type nodes for the arguments of the function.
4519 If such a type has already been constructed, reuse it. */
4522 build_function_type (tree value_type
, tree arg_types
)
4525 hashval_t hashcode
= 0;
4527 if (TREE_CODE (value_type
) == FUNCTION_TYPE
)
4529 error ("function return type cannot be function");
4530 value_type
= integer_type_node
;
4533 /* Make a node of the sort we want. */
4534 t
= make_node (FUNCTION_TYPE
);
4535 TREE_TYPE (t
) = value_type
;
4536 TYPE_ARG_TYPES (t
) = arg_types
;
4538 /* If we already have such a type, use the old one. */
4539 hashcode
= iterative_hash_object (TYPE_HASH (value_type
), hashcode
);
4540 hashcode
= type_hash_list (arg_types
, hashcode
);
4541 t
= type_hash_canon (hashcode
, t
);
4543 if (!COMPLETE_TYPE_P (t
))
4548 /* Build a function type. The RETURN_TYPE is the type returned by the
4549 function. If additional arguments are provided, they are
4550 additional argument types. The list of argument types must always
4551 be terminated by NULL_TREE. */
4554 build_function_type_list (tree return_type
, ...)
4559 va_start (p
, return_type
);
4561 t
= va_arg (p
, tree
);
4562 for (args
= NULL_TREE
; t
!= NULL_TREE
; t
= va_arg (p
, tree
))
4563 args
= tree_cons (NULL_TREE
, t
, args
);
4565 if (args
== NULL_TREE
)
4566 args
= void_list_node
;
4570 args
= nreverse (args
);
4571 TREE_CHAIN (last
) = void_list_node
;
4573 args
= build_function_type (return_type
, args
);
4579 /* Build a METHOD_TYPE for a member of BASETYPE. The RETTYPE (a TYPE)
4580 and ARGTYPES (a TREE_LIST) are the return type and arguments types
4581 for the method. An implicit additional parameter (of type
4582 pointer-to-BASETYPE) is added to the ARGTYPES. */
4585 build_method_type_directly (tree basetype
,
4593 /* Make a node of the sort we want. */
4594 t
= make_node (METHOD_TYPE
);
4596 TYPE_METHOD_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
4597 TREE_TYPE (t
) = rettype
;
4598 ptype
= build_pointer_type (basetype
);
4600 /* The actual arglist for this function includes a "hidden" argument
4601 which is "this". Put it into the list of argument types. */
4602 argtypes
= tree_cons (NULL_TREE
, ptype
, argtypes
);
4603 TYPE_ARG_TYPES (t
) = argtypes
;
4605 /* If we already have such a type, use the old one. */
4606 hashcode
= iterative_hash_object (TYPE_HASH (basetype
), hashcode
);
4607 hashcode
= iterative_hash_object (TYPE_HASH (rettype
), hashcode
);
4608 hashcode
= type_hash_list (argtypes
, hashcode
);
4609 t
= type_hash_canon (hashcode
, t
);
4611 if (!COMPLETE_TYPE_P (t
))
4617 /* Construct, lay out and return the type of methods belonging to class
4618 BASETYPE and whose arguments and values are described by TYPE.
4619 If that type exists already, reuse it.
4620 TYPE must be a FUNCTION_TYPE node. */
4623 build_method_type (tree basetype
, tree type
)
4625 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
4627 return build_method_type_directly (basetype
,
4629 TYPE_ARG_TYPES (type
));
4632 /* Construct, lay out and return the type of offsets to a value
4633 of type TYPE, within an object of type BASETYPE.
4634 If a suitable offset type exists already, reuse it. */
4637 build_offset_type (tree basetype
, tree type
)
4640 hashval_t hashcode
= 0;
4642 /* Make a node of the sort we want. */
4643 t
= make_node (OFFSET_TYPE
);
4645 TYPE_OFFSET_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
4646 TREE_TYPE (t
) = type
;
4648 /* If we already have such a type, use the old one. */
4649 hashcode
= iterative_hash_object (TYPE_HASH (basetype
), hashcode
);
4650 hashcode
= iterative_hash_object (TYPE_HASH (type
), hashcode
);
4651 t
= type_hash_canon (hashcode
, t
);
4653 if (!COMPLETE_TYPE_P (t
))
4659 /* Create a complex type whose components are COMPONENT_TYPE. */
4662 build_complex_type (tree component_type
)
4667 /* Make a node of the sort we want. */
4668 t
= make_node (COMPLEX_TYPE
);
4670 TREE_TYPE (t
) = TYPE_MAIN_VARIANT (component_type
);
4672 /* If we already have such a type, use the old one. */
4673 hashcode
= iterative_hash_object (TYPE_HASH (component_type
), 0);
4674 t
= type_hash_canon (hashcode
, t
);
4676 if (!COMPLETE_TYPE_P (t
))
4679 /* If we are writing Dwarf2 output we need to create a name,
4680 since complex is a fundamental type. */
4681 if ((write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
4685 if (component_type
== char_type_node
)
4686 name
= "complex char";
4687 else if (component_type
== signed_char_type_node
)
4688 name
= "complex signed char";
4689 else if (component_type
== unsigned_char_type_node
)
4690 name
= "complex unsigned char";
4691 else if (component_type
== short_integer_type_node
)
4692 name
= "complex short int";
4693 else if (component_type
== short_unsigned_type_node
)
4694 name
= "complex short unsigned int";
4695 else if (component_type
== integer_type_node
)
4696 name
= "complex int";
4697 else if (component_type
== unsigned_type_node
)
4698 name
= "complex unsigned int";
4699 else if (component_type
== long_integer_type_node
)
4700 name
= "complex long int";
4701 else if (component_type
== long_unsigned_type_node
)
4702 name
= "complex long unsigned int";
4703 else if (component_type
== long_long_integer_type_node
)
4704 name
= "complex long long int";
4705 else if (component_type
== long_long_unsigned_type_node
)
4706 name
= "complex long long unsigned int";
4711 TYPE_NAME (t
) = get_identifier (name
);
4714 return build_qualified_type (t
, TYPE_QUALS (component_type
));
4717 /* Return OP, stripped of any conversions to wider types as much as is safe.
4718 Converting the value back to OP's type makes a value equivalent to OP.
4720 If FOR_TYPE is nonzero, we return a value which, if converted to
4721 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
4723 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
4724 narrowest type that can hold the value, even if they don't exactly fit.
4725 Otherwise, bit-field references are changed to a narrower type
4726 only if they can be fetched directly from memory in that type.
4728 OP must have integer, real or enumeral type. Pointers are not allowed!
4730 There are some cases where the obvious value we could return
4731 would regenerate to OP if converted to OP's type,
4732 but would not extend like OP to wider types.
4733 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
4734 For example, if OP is (unsigned short)(signed char)-1,
4735 we avoid returning (signed char)-1 if FOR_TYPE is int,
4736 even though extending that to an unsigned short would regenerate OP,
4737 since the result of extending (signed char)-1 to (int)
4738 is different from (int) OP. */
4741 get_unwidened (tree op
, tree for_type
)
4743 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
4744 tree type
= TREE_TYPE (op
);
4746 = TYPE_PRECISION (for_type
!= 0 ? for_type
: type
);
4748 = (for_type
!= 0 && for_type
!= type
4749 && final_prec
> TYPE_PRECISION (type
)
4750 && TYPE_UNSIGNED (type
));
4753 while (TREE_CODE (op
) == NOP_EXPR
4754 || TREE_CODE (op
) == CONVERT_EXPR
)
4757 = TYPE_PRECISION (TREE_TYPE (op
))
4758 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0)));
4760 /* Truncations are many-one so cannot be removed.
4761 Unless we are later going to truncate down even farther. */
4763 && final_prec
> TYPE_PRECISION (TREE_TYPE (op
)))
4766 /* See what's inside this conversion. If we decide to strip it,
4768 op
= TREE_OPERAND (op
, 0);
4770 /* If we have not stripped any zero-extensions (uns is 0),
4771 we can strip any kind of extension.
4772 If we have previously stripped a zero-extension,
4773 only zero-extensions can safely be stripped.
4774 Any extension can be stripped if the bits it would produce
4775 are all going to be discarded later by truncating to FOR_TYPE. */
4779 if (! uns
|| final_prec
<= TYPE_PRECISION (TREE_TYPE (op
)))
4781 /* TYPE_UNSIGNED says whether this is a zero-extension.
4782 Let's avoid computing it if it does not affect WIN
4783 and if UNS will not be needed again. */
4785 || TREE_CODE (op
) == NOP_EXPR
4786 || TREE_CODE (op
) == CONVERT_EXPR
)
4787 && TYPE_UNSIGNED (TREE_TYPE (op
)))
4795 if (TREE_CODE (op
) == COMPONENT_REF
4796 /* Since type_for_size always gives an integer type. */
4797 && TREE_CODE (type
) != REAL_TYPE
4798 /* Don't crash if field not laid out yet. */
4799 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
4800 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
4802 unsigned int innerprec
4803 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
4804 int unsignedp
= (DECL_UNSIGNED (TREE_OPERAND (op
, 1))
4805 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op
, 1))));
4806 type
= lang_hooks
.types
.type_for_size (innerprec
, unsignedp
);
4808 /* We can get this structure field in the narrowest type it fits in.
4809 If FOR_TYPE is 0, do this only for a field that matches the
4810 narrower type exactly and is aligned for it
4811 The resulting extension to its nominal type (a fullword type)
4812 must fit the same conditions as for other extensions. */
4815 && INT_CST_LT_UNSIGNED (TYPE_SIZE (type
), TYPE_SIZE (TREE_TYPE (op
)))
4816 && (for_type
|| ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1)))
4817 && (! uns
|| final_prec
<= innerprec
|| unsignedp
))
4819 win
= build3 (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
4820 TREE_OPERAND (op
, 1), NULL_TREE
);
4821 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
4822 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
4829 /* Return OP or a simpler expression for a narrower value
4830 which can be sign-extended or zero-extended to give back OP.
4831 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
4832 or 0 if the value should be sign-extended. */
4835 get_narrower (tree op
, int *unsignedp_ptr
)
4840 bool integral_p
= INTEGRAL_TYPE_P (TREE_TYPE (op
));
4842 while (TREE_CODE (op
) == NOP_EXPR
)
4845 = (TYPE_PRECISION (TREE_TYPE (op
))
4846 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0))));
4848 /* Truncations are many-one so cannot be removed. */
4852 /* See what's inside this conversion. If we decide to strip it,
4857 op
= TREE_OPERAND (op
, 0);
4858 /* An extension: the outermost one can be stripped,
4859 but remember whether it is zero or sign extension. */
4861 uns
= TYPE_UNSIGNED (TREE_TYPE (op
));
4862 /* Otherwise, if a sign extension has been stripped,
4863 only sign extensions can now be stripped;
4864 if a zero extension has been stripped, only zero-extensions. */
4865 else if (uns
!= TYPE_UNSIGNED (TREE_TYPE (op
)))
4869 else /* bitschange == 0 */
4871 /* A change in nominal type can always be stripped, but we must
4872 preserve the unsignedness. */
4874 uns
= TYPE_UNSIGNED (TREE_TYPE (op
));
4876 op
= TREE_OPERAND (op
, 0);
4877 /* Keep trying to narrow, but don't assign op to win if it
4878 would turn an integral type into something else. */
4879 if (INTEGRAL_TYPE_P (TREE_TYPE (op
)) != integral_p
)
4886 if (TREE_CODE (op
) == COMPONENT_REF
4887 /* Since type_for_size always gives an integer type. */
4888 && TREE_CODE (TREE_TYPE (op
)) != REAL_TYPE
4889 /* Ensure field is laid out already. */
4890 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
4891 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
4893 unsigned HOST_WIDE_INT innerprec
4894 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
4895 int unsignedp
= (DECL_UNSIGNED (TREE_OPERAND (op
, 1))
4896 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op
, 1))));
4897 tree type
= lang_hooks
.types
.type_for_size (innerprec
, unsignedp
);
4899 /* We can get this structure field in a narrower type that fits it,
4900 but the resulting extension to its nominal type (a fullword type)
4901 must satisfy the same conditions as for other extensions.
4903 Do this only for fields that are aligned (not bit-fields),
4904 because when bit-field insns will be used there is no
4905 advantage in doing this. */
4907 if (innerprec
< TYPE_PRECISION (TREE_TYPE (op
))
4908 && ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1))
4909 && (first
|| uns
== DECL_UNSIGNED (TREE_OPERAND (op
, 1)))
4913 uns
= DECL_UNSIGNED (TREE_OPERAND (op
, 1));
4914 win
= build3 (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
4915 TREE_OPERAND (op
, 1), NULL_TREE
);
4916 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
4917 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
4920 *unsignedp_ptr
= uns
;
4924 /* Nonzero if integer constant C has a value that is permissible
4925 for type TYPE (an INTEGER_TYPE). */
4928 int_fits_type_p (tree c
, tree type
)
4930 tree type_low_bound
= TYPE_MIN_VALUE (type
);
4931 tree type_high_bound
= TYPE_MAX_VALUE (type
);
4932 bool ok_for_low_bound
, ok_for_high_bound
;
4935 /* If at least one bound of the type is a constant integer, we can check
4936 ourselves and maybe make a decision. If no such decision is possible, but
4937 this type is a subtype, try checking against that. Otherwise, use
4938 force_fit_type, which checks against the precision.
4940 Compute the status for each possibly constant bound, and return if we see
4941 one does not match. Use ok_for_xxx_bound for this purpose, assigning -1
4942 for "unknown if constant fits", 0 for "constant known *not* to fit" and 1
4943 for "constant known to fit". */
4945 /* Check if C >= type_low_bound. */
4946 if (type_low_bound
&& TREE_CODE (type_low_bound
) == INTEGER_CST
)
4948 if (tree_int_cst_lt (c
, type_low_bound
))
4950 ok_for_low_bound
= true;
4953 ok_for_low_bound
= false;
4955 /* Check if c <= type_high_bound. */
4956 if (type_high_bound
&& TREE_CODE (type_high_bound
) == INTEGER_CST
)
4958 if (tree_int_cst_lt (type_high_bound
, c
))
4960 ok_for_high_bound
= true;
4963 ok_for_high_bound
= false;
4965 /* If the constant fits both bounds, the result is known. */
4966 if (ok_for_low_bound
&& ok_for_high_bound
)
4969 /* Perform some generic filtering which may allow making a decision
4970 even if the bounds are not constant. First, negative integers
4971 never fit in unsigned types, */
4972 if (TYPE_UNSIGNED (type
) && tree_int_cst_sgn (c
) < 0)
4975 /* Second, narrower types always fit in wider ones. */
4976 if (TYPE_PRECISION (type
) > TYPE_PRECISION (TREE_TYPE (c
)))
4979 /* Third, unsigned integers with top bit set never fit signed types. */
4980 if (! TYPE_UNSIGNED (type
)
4981 && TYPE_UNSIGNED (TREE_TYPE (c
))
4982 && tree_int_cst_msb (c
))
4985 /* If we haven't been able to decide at this point, there nothing more we
4986 can check ourselves here. Look at the base type if we have one. */
4987 if (TREE_CODE (type
) == INTEGER_TYPE
&& TREE_TYPE (type
) != 0)
4988 return int_fits_type_p (c
, TREE_TYPE (type
));
4990 /* Or to force_fit_type, if nothing else. */
4991 tmp
= copy_node (c
);
4992 TREE_TYPE (tmp
) = type
;
4993 tmp
= force_fit_type (tmp
, -1, false, false);
4994 return TREE_INT_CST_HIGH (tmp
) == TREE_INT_CST_HIGH (c
)
4995 && TREE_INT_CST_LOW (tmp
) == TREE_INT_CST_LOW (c
);
4998 /* Subprogram of following function. Called by walk_tree.
5000 Return *TP if it is an automatic variable or parameter of the
5001 function passed in as DATA. */
5004 find_var_from_fn (tree
*tp
, int *walk_subtrees
, void *data
)
5006 tree fn
= (tree
) data
;
5011 else if (DECL_P (*tp
)
5012 && lang_hooks
.tree_inlining
.auto_var_in_fn_p (*tp
, fn
))
5018 /* Returns true if T is, contains, or refers to a type with variable
5019 size. If FN is nonzero, only return true if a modifier of the type
5020 or position of FN is a variable or parameter inside FN.
5022 This concept is more general than that of C99 'variably modified types':
5023 in C99, a struct type is never variably modified because a VLA may not
5024 appear as a structure member. However, in GNU C code like:
5026 struct S { int i[f()]; };
5028 is valid, and other languages may define similar constructs. */
5031 variably_modified_type_p (tree type
, tree fn
)
5035 /* Test if T is either variable (if FN is zero) or an expression containing
5036 a variable in FN. */
5037 #define RETURN_TRUE_IF_VAR(T) \
5038 do { tree _t = (T); \
5039 if (_t && _t != error_mark_node && TREE_CODE (_t) != INTEGER_CST \
5040 && (!fn || walk_tree (&_t, find_var_from_fn, fn, NULL))) \
5041 return true; } while (0)
5043 if (type
== error_mark_node
)
5046 /* If TYPE itself has variable size, it is variably modified.
5048 We do not yet have a representation of the C99 '[*]' syntax.
5049 When a representation is chosen, this function should be modified
5050 to test for that case as well. */
5051 RETURN_TRUE_IF_VAR (TYPE_SIZE (type
));
5052 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT(type
));
5054 switch (TREE_CODE (type
))
5057 case REFERENCE_TYPE
:
5060 if (variably_modified_type_p (TREE_TYPE (type
), fn
))
5066 /* If TYPE is a function type, it is variably modified if any of the
5067 parameters or the return type are variably modified. */
5068 if (variably_modified_type_p (TREE_TYPE (type
), fn
))
5071 for (t
= TYPE_ARG_TYPES (type
);
5072 t
&& t
!= void_list_node
;
5074 if (variably_modified_type_p (TREE_VALUE (t
), fn
))
5083 /* Scalar types are variably modified if their end points
5085 RETURN_TRUE_IF_VAR (TYPE_MIN_VALUE (type
));
5086 RETURN_TRUE_IF_VAR (TYPE_MAX_VALUE (type
));
5091 case QUAL_UNION_TYPE
:
5092 /* We can't see if any of the field are variably-modified by the
5093 definition we normally use, since that would produce infinite
5094 recursion via pointers. */
5095 /* This is variably modified if some field's type is. */
5096 for (t
= TYPE_FIELDS (type
); t
; t
= TREE_CHAIN (t
))
5097 if (TREE_CODE (t
) == FIELD_DECL
)
5099 RETURN_TRUE_IF_VAR (DECL_FIELD_OFFSET (t
));
5100 RETURN_TRUE_IF_VAR (DECL_SIZE (t
));
5101 RETURN_TRUE_IF_VAR (DECL_SIZE_UNIT (t
));
5103 if (TREE_CODE (type
) == QUAL_UNION_TYPE
)
5104 RETURN_TRUE_IF_VAR (DECL_QUALIFIER (t
));
5112 /* The current language may have other cases to check, but in general,
5113 all other types are not variably modified. */
5114 return lang_hooks
.tree_inlining
.var_mod_type_p (type
, fn
);
5116 #undef RETURN_TRUE_IF_VAR
5119 /* Given a DECL or TYPE, return the scope in which it was declared, or
5120 NULL_TREE if there is no containing scope. */
5123 get_containing_scope (tree t
)
5125 return (TYPE_P (t
) ? TYPE_CONTEXT (t
) : DECL_CONTEXT (t
));
5128 /* Return the innermost context enclosing DECL that is
5129 a FUNCTION_DECL, or zero if none. */
5132 decl_function_context (tree decl
)
5136 if (TREE_CODE (decl
) == ERROR_MARK
)
5139 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
5140 where we look up the function at runtime. Such functions always take
5141 a first argument of type 'pointer to real context'.
5143 C++ should really be fixed to use DECL_CONTEXT for the real context,
5144 and use something else for the "virtual context". */
5145 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_VINDEX (decl
))
5148 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl
)))));
5150 context
= DECL_CONTEXT (decl
);
5152 while (context
&& TREE_CODE (context
) != FUNCTION_DECL
)
5154 if (TREE_CODE (context
) == BLOCK
)
5155 context
= BLOCK_SUPERCONTEXT (context
);
5157 context
= get_containing_scope (context
);
5163 /* Return the innermost context enclosing DECL that is
5164 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
5165 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
5168 decl_type_context (tree decl
)
5170 tree context
= DECL_CONTEXT (decl
);
5173 switch (TREE_CODE (context
))
5175 case NAMESPACE_DECL
:
5176 case TRANSLATION_UNIT_DECL
:
5181 case QUAL_UNION_TYPE
:
5186 context
= DECL_CONTEXT (context
);
5190 context
= BLOCK_SUPERCONTEXT (context
);
5200 /* CALL is a CALL_EXPR. Return the declaration for the function
5201 called, or NULL_TREE if the called function cannot be
5205 get_callee_fndecl (tree call
)
5209 /* It's invalid to call this function with anything but a
5211 gcc_assert (TREE_CODE (call
) == CALL_EXPR
);
5213 /* The first operand to the CALL is the address of the function
5215 addr
= TREE_OPERAND (call
, 0);
5219 /* If this is a readonly function pointer, extract its initial value. */
5220 if (DECL_P (addr
) && TREE_CODE (addr
) != FUNCTION_DECL
5221 && TREE_READONLY (addr
) && ! TREE_THIS_VOLATILE (addr
)
5222 && DECL_INITIAL (addr
))
5223 addr
= DECL_INITIAL (addr
);
5225 /* If the address is just `&f' for some function `f', then we know
5226 that `f' is being called. */
5227 if (TREE_CODE (addr
) == ADDR_EXPR
5228 && TREE_CODE (TREE_OPERAND (addr
, 0)) == FUNCTION_DECL
)
5229 return TREE_OPERAND (addr
, 0);
5231 /* We couldn't figure out what was being called. Maybe the front
5232 end has some idea. */
5233 return lang_hooks
.lang_get_callee_fndecl (call
);
5236 /* Print debugging information about tree nodes generated during the compile,
5237 and any language-specific information. */
5240 dump_tree_statistics (void)
5242 #ifdef GATHER_STATISTICS
5244 int total_nodes
, total_bytes
;
5247 fprintf (stderr
, "\n??? tree nodes created\n\n");
5248 #ifdef GATHER_STATISTICS
5249 fprintf (stderr
, "Kind Nodes Bytes\n");
5250 fprintf (stderr
, "---------------------------------------\n");
5251 total_nodes
= total_bytes
= 0;
5252 for (i
= 0; i
< (int) all_kinds
; i
++)
5254 fprintf (stderr
, "%-20s %7d %10d\n", tree_node_kind_names
[i
],
5255 tree_node_counts
[i
], tree_node_sizes
[i
]);
5256 total_nodes
+= tree_node_counts
[i
];
5257 total_bytes
+= tree_node_sizes
[i
];
5259 fprintf (stderr
, "---------------------------------------\n");
5260 fprintf (stderr
, "%-20s %7d %10d\n", "Total", total_nodes
, total_bytes
);
5261 fprintf (stderr
, "---------------------------------------\n");
5262 ssanames_print_statistics ();
5263 phinodes_print_statistics ();
5265 fprintf (stderr
, "(No per-node statistics)\n");
5267 print_type_hash_statistics ();
5268 lang_hooks
.print_statistics ();
5271 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
5273 /* Generate a crc32 of a string. */
5276 crc32_string (unsigned chksum
, const char *string
)
5280 unsigned value
= *string
<< 24;
5283 for (ix
= 8; ix
--; value
<<= 1)
5287 feedback
= (value
^ chksum
) & 0x80000000 ? 0x04c11db7 : 0;
5296 /* P is a string that will be used in a symbol. Mask out any characters
5297 that are not valid in that context. */
5300 clean_symbol_name (char *p
)
5304 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
5307 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
5314 /* Generate a name for a function unique to this translation unit.
5315 TYPE is some string to identify the purpose of this function to the
5316 linker or collect2. */
5319 get_file_function_name_long (const char *type
)
5325 if (first_global_object_name
)
5326 p
= first_global_object_name
;
5329 /* We don't have anything that we know to be unique to this translation
5330 unit, so use what we do have and throw in some randomness. */
5332 const char *name
= weak_global_object_name
;
5333 const char *file
= main_input_filename
;
5338 file
= input_filename
;
5340 len
= strlen (file
);
5341 q
= alloca (9 * 2 + len
+ 1);
5342 memcpy (q
, file
, len
+ 1);
5343 clean_symbol_name (q
);
5345 sprintf (q
+ len
, "_%08X_%08X", crc32_string (0, name
),
5346 crc32_string (0, flag_random_seed
));
5351 buf
= alloca (sizeof (FILE_FUNCTION_FORMAT
) + strlen (p
) + strlen (type
));
5353 /* Set up the name of the file-level functions we may need.
5354 Use a global object (which is already required to be unique over
5355 the program) rather than the file name (which imposes extra
5357 sprintf (buf
, FILE_FUNCTION_FORMAT
, type
, p
);
5359 return get_identifier (buf
);
5362 /* If KIND=='I', return a suitable global initializer (constructor) name.
5363 If KIND=='D', return a suitable global clean-up (destructor) name. */
5366 get_file_function_name (int kind
)
5373 return get_file_function_name_long (p
);
5376 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
5378 /* Complain that the tree code of NODE does not match the expected 0
5379 terminated list of trailing codes. The trailing code list can be
5380 empty, for a more vague error message. FILE, LINE, and FUNCTION
5381 are of the caller. */
5384 tree_check_failed (const tree node
, const char *file
,
5385 int line
, const char *function
, ...)
5389 unsigned length
= 0;
5392 va_start (args
, function
);
5393 while ((code
= va_arg (args
, int)))
5394 length
+= 4 + strlen (tree_code_name
[code
]);
5398 va_start (args
, function
);
5399 length
+= strlen ("expected ");
5400 buffer
= alloca (length
);
5402 while ((code
= va_arg (args
, int)))
5404 const char *prefix
= length
? " or " : "expected ";
5406 strcpy (buffer
+ length
, prefix
);
5407 length
+= strlen (prefix
);
5408 strcpy (buffer
+ length
, tree_code_name
[code
]);
5409 length
+= strlen (tree_code_name
[code
]);
5414 buffer
= (char *)"unexpected node";
5416 internal_error ("tree check: %s, have %s in %s, at %s:%d",
5417 buffer
, tree_code_name
[TREE_CODE (node
)],
5418 function
, trim_filename (file
), line
);
5421 /* Complain that the tree code of NODE does match the expected 0
5422 terminated list of trailing codes. FILE, LINE, and FUNCTION are of
5426 tree_not_check_failed (const tree node
, const char *file
,
5427 int line
, const char *function
, ...)
5431 unsigned length
= 0;
5434 va_start (args
, function
);
5435 while ((code
= va_arg (args
, int)))
5436 length
+= 4 + strlen (tree_code_name
[code
]);
5438 va_start (args
, function
);
5439 buffer
= alloca (length
);
5441 while ((code
= va_arg (args
, int)))
5445 strcpy (buffer
+ length
, " or ");
5448 strcpy (buffer
+ length
, tree_code_name
[code
]);
5449 length
+= strlen (tree_code_name
[code
]);
5453 internal_error ("tree check: expected none of %s, have %s in %s, at %s:%d",
5454 buffer
, tree_code_name
[TREE_CODE (node
)],
5455 function
, trim_filename (file
), line
);
5458 /* Similar to tree_check_failed, except that we check for a class of tree
5459 code, given in CL. */
5462 tree_class_check_failed (const tree node
, const enum tree_code_class cl
,
5463 const char *file
, int line
, const char *function
)
5466 ("tree check: expected class %qs, have %qs (%s) in %s, at %s:%d",
5467 TREE_CODE_CLASS_STRING (cl
),
5468 TREE_CODE_CLASS_STRING (TREE_CODE_CLASS (TREE_CODE (node
))),
5469 tree_code_name
[TREE_CODE (node
)], function
, trim_filename (file
), line
);
5472 /* Similar to above, except that the check is for the bounds of a TREE_VEC's
5473 (dynamically sized) vector. */
5476 tree_vec_elt_check_failed (int idx
, int len
, const char *file
, int line
,
5477 const char *function
)
5480 ("tree check: accessed elt %d of tree_vec with %d elts in %s, at %s:%d",
5481 idx
+ 1, len
, function
, trim_filename (file
), line
);
5484 /* Similar to above, except that the check is for the bounds of a PHI_NODE's
5485 (dynamically sized) vector. */
5488 phi_node_elt_check_failed (int idx
, int len
, const char *file
, int line
,
5489 const char *function
)
5492 ("tree check: accessed elt %d of phi_node with %d elts in %s, at %s:%d",
5493 idx
+ 1, len
, function
, trim_filename (file
), line
);
5496 /* Similar to above, except that the check is for the bounds of the operand
5497 vector of an expression node. */
5500 tree_operand_check_failed (int idx
, enum tree_code code
, const char *file
,
5501 int line
, const char *function
)
5504 ("tree check: accessed operand %d of %s with %d operands in %s, at %s:%d",
5505 idx
+ 1, tree_code_name
[code
], TREE_CODE_LENGTH (code
),
5506 function
, trim_filename (file
), line
);
5508 #endif /* ENABLE_TREE_CHECKING */
5510 /* Create a new vector type node holding SUBPARTS units of type INNERTYPE,
5511 and mapped to the machine mode MODE. Initialize its fields and build
5512 the information necessary for debugging output. */
5515 make_vector_type (tree innertype
, int nunits
, enum machine_mode mode
)
5517 tree t
= make_node (VECTOR_TYPE
);
5519 TREE_TYPE (t
) = TYPE_MAIN_VARIANT (innertype
);
5520 TYPE_VECTOR_SUBPARTS (t
) = nunits
;
5521 TYPE_MODE (t
) = mode
;
5522 TYPE_READONLY (t
) = TYPE_READONLY (innertype
);
5523 TYPE_VOLATILE (t
) = TYPE_VOLATILE (innertype
);
5528 tree index
= build_int_cst (NULL_TREE
, nunits
- 1);
5529 tree array
= build_array_type (innertype
, build_index_type (index
));
5530 tree rt
= make_node (RECORD_TYPE
);
5532 TYPE_FIELDS (rt
) = build_decl (FIELD_DECL
, get_identifier ("f"), array
);
5533 DECL_CONTEXT (TYPE_FIELDS (rt
)) = rt
;
5535 TYPE_DEBUG_REPRESENTATION_TYPE (t
) = rt
;
5536 /* In dwarfout.c, type lookup uses TYPE_UID numbers. We want to output
5537 the representation type, and we want to find that die when looking up
5538 the vector type. This is most easily achieved by making the TYPE_UID
5540 TYPE_UID (rt
) = TYPE_UID (t
);
5543 /* Build our main variant, based on the main variant of the inner type. */
5544 if (TYPE_MAIN_VARIANT (innertype
) != innertype
)
5546 tree innertype_main_variant
= TYPE_MAIN_VARIANT (innertype
);
5547 unsigned int hash
= TYPE_HASH (innertype_main_variant
);
5548 TYPE_MAIN_VARIANT (t
)
5549 = type_hash_canon (hash
, make_vector_type (innertype_main_variant
,
5557 make_or_reuse_type (unsigned size
, int unsignedp
)
5559 if (size
== INT_TYPE_SIZE
)
5560 return unsignedp
? unsigned_type_node
: integer_type_node
;
5561 if (size
== CHAR_TYPE_SIZE
)
5562 return unsignedp
? unsigned_char_type_node
: signed_char_type_node
;
5563 if (size
== SHORT_TYPE_SIZE
)
5564 return unsignedp
? short_unsigned_type_node
: short_integer_type_node
;
5565 if (size
== LONG_TYPE_SIZE
)
5566 return unsignedp
? long_unsigned_type_node
: long_integer_type_node
;
5567 if (size
== LONG_LONG_TYPE_SIZE
)
5568 return (unsignedp
? long_long_unsigned_type_node
5569 : long_long_integer_type_node
);
5572 return make_unsigned_type (size
);
5574 return make_signed_type (size
);
5577 /* Create nodes for all integer types (and error_mark_node) using the sizes
5578 of C datatypes. The caller should call set_sizetype soon after calling
5579 this function to select one of the types as sizetype. */
5582 build_common_tree_nodes (bool signed_char
, bool signed_sizetype
)
5584 error_mark_node
= make_node (ERROR_MARK
);
5585 TREE_TYPE (error_mark_node
) = error_mark_node
;
5587 initialize_sizetypes (signed_sizetype
);
5589 /* Define both `signed char' and `unsigned char'. */
5590 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
5591 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
5593 /* Define `char', which is like either `signed char' or `unsigned char'
5594 but not the same as either. */
5597 ? make_signed_type (CHAR_TYPE_SIZE
)
5598 : make_unsigned_type (CHAR_TYPE_SIZE
));
5600 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
5601 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
5602 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
5603 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
5604 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
5605 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
5606 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
5607 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
5609 /* Define a boolean type. This type only represents boolean values but
5610 may be larger than char depending on the value of BOOL_TYPE_SIZE.
5611 Front ends which want to override this size (i.e. Java) can redefine
5612 boolean_type_node before calling build_common_tree_nodes_2. */
5613 boolean_type_node
= make_unsigned_type (BOOL_TYPE_SIZE
);
5614 TREE_SET_CODE (boolean_type_node
, BOOLEAN_TYPE
);
5615 TYPE_MAX_VALUE (boolean_type_node
) = build_int_cst (boolean_type_node
, 1);
5616 TYPE_PRECISION (boolean_type_node
) = 1;
5618 /* Fill in the rest of the sized types. Reuse existing type nodes
5620 intQI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (QImode
), 0);
5621 intHI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (HImode
), 0);
5622 intSI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (SImode
), 0);
5623 intDI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (DImode
), 0);
5624 intTI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (TImode
), 0);
5626 unsigned_intQI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (QImode
), 1);
5627 unsigned_intHI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (HImode
), 1);
5628 unsigned_intSI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (SImode
), 1);
5629 unsigned_intDI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (DImode
), 1);
5630 unsigned_intTI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (TImode
), 1);
5632 access_public_node
= get_identifier ("public");
5633 access_protected_node
= get_identifier ("protected");
5634 access_private_node
= get_identifier ("private");
5637 /* Call this function after calling build_common_tree_nodes and set_sizetype.
5638 It will create several other common tree nodes. */
5641 build_common_tree_nodes_2 (int short_double
)
5643 /* Define these next since types below may used them. */
5644 integer_zero_node
= build_int_cst (NULL_TREE
, 0);
5645 integer_one_node
= build_int_cst (NULL_TREE
, 1);
5646 integer_minus_one_node
= build_int_cst (NULL_TREE
, -1);
5648 size_zero_node
= size_int (0);
5649 size_one_node
= size_int (1);
5650 bitsize_zero_node
= bitsize_int (0);
5651 bitsize_one_node
= bitsize_int (1);
5652 bitsize_unit_node
= bitsize_int (BITS_PER_UNIT
);
5654 boolean_false_node
= TYPE_MIN_VALUE (boolean_type_node
);
5655 boolean_true_node
= TYPE_MAX_VALUE (boolean_type_node
);
5657 void_type_node
= make_node (VOID_TYPE
);
5658 layout_type (void_type_node
);
5660 /* We are not going to have real types in C with less than byte alignment,
5661 so we might as well not have any types that claim to have it. */
5662 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
5663 TYPE_USER_ALIGN (void_type_node
) = 0;
5665 null_pointer_node
= build_int_cst (build_pointer_type (void_type_node
), 0);
5666 layout_type (TREE_TYPE (null_pointer_node
));
5668 ptr_type_node
= build_pointer_type (void_type_node
);
5670 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
5671 fileptr_type_node
= ptr_type_node
;
5673 float_type_node
= make_node (REAL_TYPE
);
5674 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
5675 layout_type (float_type_node
);
5677 double_type_node
= make_node (REAL_TYPE
);
5679 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
5681 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
5682 layout_type (double_type_node
);
5684 long_double_type_node
= make_node (REAL_TYPE
);
5685 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
5686 layout_type (long_double_type_node
);
5688 float_ptr_type_node
= build_pointer_type (float_type_node
);
5689 double_ptr_type_node
= build_pointer_type (double_type_node
);
5690 long_double_ptr_type_node
= build_pointer_type (long_double_type_node
);
5691 integer_ptr_type_node
= build_pointer_type (integer_type_node
);
5693 complex_integer_type_node
= make_node (COMPLEX_TYPE
);
5694 TREE_TYPE (complex_integer_type_node
) = integer_type_node
;
5695 layout_type (complex_integer_type_node
);
5697 complex_float_type_node
= make_node (COMPLEX_TYPE
);
5698 TREE_TYPE (complex_float_type_node
) = float_type_node
;
5699 layout_type (complex_float_type_node
);
5701 complex_double_type_node
= make_node (COMPLEX_TYPE
);
5702 TREE_TYPE (complex_double_type_node
) = double_type_node
;
5703 layout_type (complex_double_type_node
);
5705 complex_long_double_type_node
= make_node (COMPLEX_TYPE
);
5706 TREE_TYPE (complex_long_double_type_node
) = long_double_type_node
;
5707 layout_type (complex_long_double_type_node
);
5710 tree t
= targetm
.build_builtin_va_list ();
5712 /* Many back-ends define record types without setting TYPE_NAME.
5713 If we copied the record type here, we'd keep the original
5714 record type without a name. This breaks name mangling. So,
5715 don't copy record types and let c_common_nodes_and_builtins()
5716 declare the type to be __builtin_va_list. */
5717 if (TREE_CODE (t
) != RECORD_TYPE
)
5718 t
= build_variant_type_copy (t
);
5720 va_list_type_node
= t
;
5724 /* A subroutine of build_common_builtin_nodes. Define a builtin function. */
5727 local_define_builtin (const char *name
, tree type
, enum built_in_function code
,
5728 const char *library_name
, int ecf_flags
)
5732 decl
= lang_hooks
.builtin_function (name
, type
, code
, BUILT_IN_NORMAL
,
5733 library_name
, NULL_TREE
);
5734 if (ecf_flags
& ECF_CONST
)
5735 TREE_READONLY (decl
) = 1;
5736 if (ecf_flags
& ECF_PURE
)
5737 DECL_IS_PURE (decl
) = 1;
5738 if (ecf_flags
& ECF_NORETURN
)
5739 TREE_THIS_VOLATILE (decl
) = 1;
5740 if (ecf_flags
& ECF_NOTHROW
)
5741 TREE_NOTHROW (decl
) = 1;
5742 if (ecf_flags
& ECF_MALLOC
)
5743 DECL_IS_MALLOC (decl
) = 1;
5745 built_in_decls
[code
] = decl
;
5746 implicit_built_in_decls
[code
] = decl
;
5749 /* Call this function after instantiating all builtins that the language
5750 front end cares about. This will build the rest of the builtins that
5751 are relied upon by the tree optimizers and the middle-end. */
5754 build_common_builtin_nodes (void)
5758 if (built_in_decls
[BUILT_IN_MEMCPY
] == NULL
5759 || built_in_decls
[BUILT_IN_MEMMOVE
] == NULL
)
5761 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
5762 tmp
= tree_cons (NULL_TREE
, const_ptr_type_node
, tmp
);
5763 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
5764 ftype
= build_function_type (ptr_type_node
, tmp
);
5766 if (built_in_decls
[BUILT_IN_MEMCPY
] == NULL
)
5767 local_define_builtin ("__builtin_memcpy", ftype
, BUILT_IN_MEMCPY
,
5768 "memcpy", ECF_NOTHROW
);
5769 if (built_in_decls
[BUILT_IN_MEMMOVE
] == NULL
)
5770 local_define_builtin ("__builtin_memmove", ftype
, BUILT_IN_MEMMOVE
,
5771 "memmove", ECF_NOTHROW
);
5774 if (built_in_decls
[BUILT_IN_MEMCMP
] == NULL
)
5776 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
5777 tmp
= tree_cons (NULL_TREE
, const_ptr_type_node
, tmp
);
5778 tmp
= tree_cons (NULL_TREE
, const_ptr_type_node
, tmp
);
5779 ftype
= build_function_type (ptr_type_node
, tmp
);
5780 local_define_builtin ("__builtin_memcmp", ftype
, BUILT_IN_MEMCMP
,
5781 "memcmp", ECF_PURE
| ECF_NOTHROW
);
5784 if (built_in_decls
[BUILT_IN_MEMSET
] == NULL
)
5786 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
5787 tmp
= tree_cons (NULL_TREE
, integer_type_node
, tmp
);
5788 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
5789 ftype
= build_function_type (ptr_type_node
, tmp
);
5790 local_define_builtin ("__builtin_memset", ftype
, BUILT_IN_MEMSET
,
5791 "memset", ECF_NOTHROW
);
5794 if (built_in_decls
[BUILT_IN_ALLOCA
] == NULL
)
5796 tmp
= tree_cons (NULL_TREE
, size_type_node
, void_list_node
);
5797 ftype
= build_function_type (ptr_type_node
, tmp
);
5798 local_define_builtin ("__builtin_alloca", ftype
, BUILT_IN_ALLOCA
,
5799 "alloca", ECF_NOTHROW
| ECF_MALLOC
);
5802 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
5803 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
5804 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
5805 ftype
= build_function_type (void_type_node
, tmp
);
5806 local_define_builtin ("__builtin_init_trampoline", ftype
,
5807 BUILT_IN_INIT_TRAMPOLINE
,
5808 "__builtin_init_trampoline", ECF_NOTHROW
);
5810 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
5811 ftype
= build_function_type (ptr_type_node
, tmp
);
5812 local_define_builtin ("__builtin_adjust_trampoline", ftype
,
5813 BUILT_IN_ADJUST_TRAMPOLINE
,
5814 "__builtin_adjust_trampoline",
5815 ECF_CONST
| ECF_NOTHROW
);
5817 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
5818 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, tmp
);
5819 ftype
= build_function_type (void_type_node
, tmp
);
5820 local_define_builtin ("__builtin_nonlocal_goto", ftype
,
5821 BUILT_IN_NONLOCAL_GOTO
,
5822 "__builtin_nonlocal_goto",
5823 ECF_NORETURN
| ECF_NOTHROW
);
5825 ftype
= build_function_type (ptr_type_node
, void_list_node
);
5826 local_define_builtin ("__builtin_stack_save", ftype
, BUILT_IN_STACK_SAVE
,
5827 "__builtin_stack_save", ECF_NOTHROW
);
5829 tmp
= tree_cons (NULL_TREE
, ptr_type_node
, void_list_node
);
5830 ftype
= build_function_type (void_type_node
, tmp
);
5831 local_define_builtin ("__builtin_stack_restore", ftype
,
5832 BUILT_IN_STACK_RESTORE
,
5833 "__builtin_stack_restore", ECF_NOTHROW
);
5835 ftype
= build_function_type (void_type_node
, void_list_node
);
5836 local_define_builtin ("__builtin_profile_func_enter", ftype
,
5837 BUILT_IN_PROFILE_FUNC_ENTER
, "profile_func_enter", 0);
5838 local_define_builtin ("__builtin_profile_func_exit", ftype
,
5839 BUILT_IN_PROFILE_FUNC_EXIT
, "profile_func_exit", 0);
5841 /* Complex multiplication and division. These are handled as builtins
5842 rather than optabs because emit_library_call_value doesn't support
5843 complex. Further, we can do slightly better with folding these
5844 beasties if the real and complex parts of the arguments are separate. */
5846 enum machine_mode mode
;
5848 for (mode
= MIN_MODE_COMPLEX_FLOAT
; mode
<= MAX_MODE_COMPLEX_FLOAT
; ++mode
)
5850 char mode_name_buf
[4], *q
;
5852 enum built_in_function mcode
, dcode
;
5853 tree type
, inner_type
;
5855 type
= lang_hooks
.types
.type_for_mode (mode
, 0);
5858 inner_type
= TREE_TYPE (type
);
5860 tmp
= tree_cons (NULL_TREE
, inner_type
, void_list_node
);
5861 tmp
= tree_cons (NULL_TREE
, inner_type
, tmp
);
5862 tmp
= tree_cons (NULL_TREE
, inner_type
, tmp
);
5863 tmp
= tree_cons (NULL_TREE
, inner_type
, tmp
);
5864 ftype
= build_function_type (type
, tmp
);
5866 mcode
= BUILT_IN_COMPLEX_MUL_MIN
+ mode
- MIN_MODE_COMPLEX_FLOAT
;
5867 dcode
= BUILT_IN_COMPLEX_DIV_MIN
+ mode
- MIN_MODE_COMPLEX_FLOAT
;
5869 for (p
= GET_MODE_NAME (mode
), q
= mode_name_buf
; *p
; p
++, q
++)
5873 built_in_names
[mcode
] = concat ("__mul", mode_name_buf
, "3", NULL
);
5874 local_define_builtin (built_in_names
[mcode
], ftype
, mcode
,
5875 built_in_names
[mcode
], ECF_CONST
| ECF_NOTHROW
);
5877 built_in_names
[dcode
] = concat ("__div", mode_name_buf
, "3", NULL
);
5878 local_define_builtin (built_in_names
[dcode
], ftype
, dcode
,
5879 built_in_names
[dcode
], ECF_CONST
| ECF_NOTHROW
);
5884 /* HACK. GROSS. This is absolutely disgusting. I wish there was a
5887 If we requested a pointer to a vector, build up the pointers that
5888 we stripped off while looking for the inner type. Similarly for
5889 return values from functions.
5891 The argument TYPE is the top of the chain, and BOTTOM is the
5892 new type which we will point to. */
5895 reconstruct_complex_type (tree type
, tree bottom
)
5899 if (POINTER_TYPE_P (type
))
5901 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5902 outer
= build_pointer_type (inner
);
5904 else if (TREE_CODE (type
) == ARRAY_TYPE
)
5906 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5907 outer
= build_array_type (inner
, TYPE_DOMAIN (type
));
5909 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5911 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5912 outer
= build_function_type (inner
, TYPE_ARG_TYPES (type
));
5914 else if (TREE_CODE (type
) == METHOD_TYPE
)
5917 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5918 /* The build_method_type_directly() routine prepends 'this' to argument list,
5919 so we must compensate by getting rid of it. */
5920 argtypes
= TYPE_ARG_TYPES (type
);
5921 outer
= build_method_type_directly (TYPE_METHOD_BASETYPE (type
),
5923 TYPE_ARG_TYPES (type
));
5924 TYPE_ARG_TYPES (outer
) = argtypes
;
5929 TYPE_READONLY (outer
) = TYPE_READONLY (type
);
5930 TYPE_VOLATILE (outer
) = TYPE_VOLATILE (type
);
5935 /* Returns a vector tree node given a mode (integer, vector, or BLKmode) and
5938 build_vector_type_for_mode (tree innertype
, enum machine_mode mode
)
5942 switch (GET_MODE_CLASS (mode
))
5944 case MODE_VECTOR_INT
:
5945 case MODE_VECTOR_FLOAT
:
5946 nunits
= GET_MODE_NUNITS (mode
);
5950 /* Check that there are no leftover bits. */
5951 gcc_assert (GET_MODE_BITSIZE (mode
)
5952 % TREE_INT_CST_LOW (TYPE_SIZE (innertype
)) == 0);
5954 nunits
= GET_MODE_BITSIZE (mode
)
5955 / TREE_INT_CST_LOW (TYPE_SIZE (innertype
));
5962 return make_vector_type (innertype
, nunits
, mode
);
5965 /* Similarly, but takes the inner type and number of units, which must be
5969 build_vector_type (tree innertype
, int nunits
)
5971 return make_vector_type (innertype
, nunits
, VOIDmode
);
5974 /* Given an initializer INIT, return TRUE if INIT is zero or some
5975 aggregate of zeros. Otherwise return FALSE. */
5977 initializer_zerop (tree init
)
5983 switch (TREE_CODE (init
))
5986 return integer_zerop (init
);
5989 /* ??? Note that this is not correct for C4X float formats. There,
5990 a bit pattern of all zeros is 1.0; 0.0 is encoded with the most
5991 negative exponent. */
5992 return real_zerop (init
)
5993 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (init
));
5996 return integer_zerop (init
)
5997 || (real_zerop (init
)
5998 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_REALPART (init
)))
5999 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_IMAGPART (init
))));
6002 for (elt
= TREE_VECTOR_CST_ELTS (init
); elt
; elt
= TREE_CHAIN (elt
))
6003 if (!initializer_zerop (TREE_VALUE (elt
)))
6008 elt
= CONSTRUCTOR_ELTS (init
);
6009 if (elt
== NULL_TREE
)
6012 for (; elt
; elt
= TREE_CHAIN (elt
))
6013 if (! initializer_zerop (TREE_VALUE (elt
)))
6023 add_var_to_bind_expr (tree bind_expr
, tree var
)
6025 BIND_EXPR_VARS (bind_expr
)
6026 = chainon (BIND_EXPR_VARS (bind_expr
), var
);
6027 if (BIND_EXPR_BLOCK (bind_expr
))
6028 BLOCK_VARS (BIND_EXPR_BLOCK (bind_expr
))
6029 = BIND_EXPR_VARS (bind_expr
);
6032 /* Build an empty statement. */
6035 build_empty_stmt (void)
6037 return build1 (NOP_EXPR
, void_type_node
, size_zero_node
);
6041 /* Returns true if it is possible to prove that the index of
6042 an array access REF (an ARRAY_REF expression) falls into the
6046 in_array_bounds_p (tree ref
)
6048 tree idx
= TREE_OPERAND (ref
, 1);
6051 if (TREE_CODE (idx
) != INTEGER_CST
)
6054 min
= array_ref_low_bound (ref
);
6055 max
= array_ref_up_bound (ref
);
6058 || TREE_CODE (min
) != INTEGER_CST
6059 || TREE_CODE (max
) != INTEGER_CST
)
6062 if (tree_int_cst_lt (idx
, min
)
6063 || tree_int_cst_lt (max
, idx
))
6069 /* Return true if T (assumed to be a DECL) is a global variable. */
6072 is_global_var (tree t
)
6074 return (TREE_STATIC (t
) || DECL_EXTERNAL (t
));
6077 /* Return true if T (assumed to be a DECL) must be assigned a memory
6081 needs_to_live_in_memory (tree t
)
6083 return (TREE_ADDRESSABLE (t
)
6084 || is_global_var (t
)
6085 || (TREE_CODE (t
) == RESULT_DECL
6086 && aggregate_value_p (t
, current_function_decl
)));
6089 /* There are situations in which a language considers record types
6090 compatible which have different field lists. Decide if two fields
6091 are compatible. It is assumed that the parent records are compatible. */
6094 fields_compatible_p (tree f1
, tree f2
)
6096 if (!operand_equal_p (DECL_FIELD_BIT_OFFSET (f1
),
6097 DECL_FIELD_BIT_OFFSET (f2
), OEP_ONLY_CONST
))
6100 if (!operand_equal_p (DECL_FIELD_OFFSET (f1
),
6101 DECL_FIELD_OFFSET (f2
), OEP_ONLY_CONST
))
6104 if (!lang_hooks
.types_compatible_p (TREE_TYPE (f1
), TREE_TYPE (f2
)))
6110 /* Locate within RECORD a field that is compatible with ORIG_FIELD. */
6113 find_compatible_field (tree record
, tree orig_field
)
6117 for (f
= TYPE_FIELDS (record
); f
; f
= TREE_CHAIN (f
))
6118 if (TREE_CODE (f
) == FIELD_DECL
6119 && fields_compatible_p (f
, orig_field
))
6122 /* ??? Why isn't this on the main fields list? */
6123 f
= TYPE_VFIELD (record
);
6124 if (f
&& TREE_CODE (f
) == FIELD_DECL
6125 && fields_compatible_p (f
, orig_field
))
6128 /* ??? We should abort here, but Java appears to do Bad Things
6129 with inherited fields. */
6133 /* Return value of a constant X. */
6136 int_cst_value (tree x
)
6138 unsigned bits
= TYPE_PRECISION (TREE_TYPE (x
));
6139 unsigned HOST_WIDE_INT val
= TREE_INT_CST_LOW (x
);
6140 bool negative
= ((val
>> (bits
- 1)) & 1) != 0;
6142 gcc_assert (bits
<= HOST_BITS_PER_WIDE_INT
);
6145 val
|= (~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1) << 1;
6147 val
&= ~((~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1) << 1);
6152 /* Returns the greatest common divisor of A and B, which must be
6156 tree_fold_gcd (tree a
, tree b
)
6159 tree type
= TREE_TYPE (a
);
6161 gcc_assert (TREE_CODE (a
) == INTEGER_CST
);
6162 gcc_assert (TREE_CODE (b
) == INTEGER_CST
);
6164 if (integer_zerop (a
))
6167 if (integer_zerop (b
))
6170 if (tree_int_cst_sgn (a
) == -1)
6171 a
= fold (build2 (MULT_EXPR
, type
, a
,
6172 convert (type
, integer_minus_one_node
)));
6174 if (tree_int_cst_sgn (b
) == -1)
6175 b
= fold (build2 (MULT_EXPR
, type
, b
,
6176 convert (type
, integer_minus_one_node
)));
6180 a_mod_b
= fold (build2 (FLOOR_MOD_EXPR
, type
, a
, b
));
6182 if (!TREE_INT_CST_LOW (a_mod_b
)
6183 && !TREE_INT_CST_HIGH (a_mod_b
))
6191 /* Returns unsigned variant of TYPE. */
6194 unsigned_type_for (tree type
)
6196 return lang_hooks
.types
.unsigned_type (type
);
6199 /* Returns signed variant of TYPE. */
6202 signed_type_for (tree type
)
6204 return lang_hooks
.types
.signed_type (type
);
6207 /* Returns the largest value obtainable by casting something in INNER type to
6211 upper_bound_in_type (tree outer
, tree inner
)
6213 unsigned HOST_WIDE_INT lo
, hi
;
6214 unsigned bits
= TYPE_PRECISION (inner
);
6216 if (TYPE_UNSIGNED (outer
) || TYPE_UNSIGNED (inner
))
6218 /* Zero 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
);
6227 hi
= (~(unsigned HOST_WIDE_INT
) 0)
6228 >> (2 * HOST_BITS_PER_WIDE_INT
- bits
);
6229 lo
= ~(unsigned HOST_WIDE_INT
) 0;
6234 /* Sign extending in these cases. */
6235 if (bits
<= HOST_BITS_PER_WIDE_INT
)
6238 lo
= (~(unsigned HOST_WIDE_INT
) 0)
6239 >> (HOST_BITS_PER_WIDE_INT
- bits
) >> 1;
6243 hi
= (~(unsigned HOST_WIDE_INT
) 0)
6244 >> (2 * HOST_BITS_PER_WIDE_INT
- bits
) >> 1;
6245 lo
= ~(unsigned HOST_WIDE_INT
) 0;
6249 return fold_convert (outer
,
6250 build_int_cst_wide (inner
, lo
, hi
));
6253 /* Returns the smallest value obtainable by casting something in INNER type to
6257 lower_bound_in_type (tree outer
, tree inner
)
6259 unsigned HOST_WIDE_INT lo
, hi
;
6260 unsigned bits
= TYPE_PRECISION (inner
);
6262 if (TYPE_UNSIGNED (outer
) || TYPE_UNSIGNED (inner
))
6264 else if (bits
<= HOST_BITS_PER_WIDE_INT
)
6266 hi
= ~(unsigned HOST_WIDE_INT
) 0;
6267 lo
= (~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1);
6271 hi
= (~(unsigned HOST_WIDE_INT
) 0) << (bits
- HOST_BITS_PER_WIDE_INT
- 1);
6275 return fold_convert (outer
,
6276 build_int_cst_wide (inner
, lo
, hi
));
6279 /* Return nonzero if two operands that are suitable for PHI nodes are
6280 necessarily equal. Specifically, both ARG0 and ARG1 must be either
6281 SSA_NAME or invariant. Note that this is strictly an optimization.
6282 That is, callers of this function can directly call operand_equal_p
6283 and get the same result, only slower. */
6286 operand_equal_for_phi_arg_p (tree arg0
, tree arg1
)
6290 if (TREE_CODE (arg0
) == SSA_NAME
|| TREE_CODE (arg1
) == SSA_NAME
)
6292 return operand_equal_p (arg0
, arg1
, 0);
6295 /* Returns number of zeros at the end of binary representation of X.
6297 ??? Use ffs if available? */
6300 num_ending_zeros (tree x
)
6302 unsigned HOST_WIDE_INT fr
, nfr
;
6303 unsigned num
, abits
;
6304 tree type
= TREE_TYPE (x
);
6306 if (TREE_INT_CST_LOW (x
) == 0)
6308 num
= HOST_BITS_PER_WIDE_INT
;
6309 fr
= TREE_INT_CST_HIGH (x
);
6314 fr
= TREE_INT_CST_LOW (x
);
6317 for (abits
= HOST_BITS_PER_WIDE_INT
/ 2; abits
; abits
/= 2)
6320 if (nfr
<< abits
== fr
)
6327 if (num
> TYPE_PRECISION (type
))
6328 num
= TYPE_PRECISION (type
);
6330 return build_int_cst_type (type
, num
);
6334 #define WALK_SUBTREE(NODE) \
6337 result = walk_tree (&(NODE), func, data, pset); \
6343 /* This is a subroutine of walk_tree that walks field of TYPE that are to
6344 be walked whenever a type is seen in the tree. Rest of operands and return
6345 value are as for walk_tree. */
6348 walk_type_fields (tree type
, walk_tree_fn func
, void *data
,
6349 struct pointer_set_t
*pset
)
6351 tree result
= NULL_TREE
;
6353 switch (TREE_CODE (type
))
6356 case REFERENCE_TYPE
:
6357 /* We have to worry about mutually recursive pointers. These can't
6358 be written in C. They can in Ada. It's pathological, but
6359 there's an ACATS test (c38102a) that checks it. Deal with this
6360 by checking if we're pointing to another pointer, that one
6361 points to another pointer, that one does too, and we have no htab.
6362 If so, get a hash table. We check three levels deep to avoid
6363 the cost of the hash table if we don't need one. */
6364 if (POINTER_TYPE_P (TREE_TYPE (type
))
6365 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (type
)))
6366 && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (TREE_TYPE (type
))))
6369 result
= walk_tree_without_duplicates (&TREE_TYPE (type
),
6377 /* ... fall through ... */
6380 WALK_SUBTREE (TREE_TYPE (type
));
6384 WALK_SUBTREE (TYPE_METHOD_BASETYPE (type
));
6389 WALK_SUBTREE (TREE_TYPE (type
));
6393 /* We never want to walk into default arguments. */
6394 for (arg
= TYPE_ARG_TYPES (type
); arg
; arg
= TREE_CHAIN (arg
))
6395 WALK_SUBTREE (TREE_VALUE (arg
));
6400 /* Don't follow this nodes's type if a pointer for fear that we'll
6401 have infinite recursion. Those types are uninteresting anyway. */
6402 if (!POINTER_TYPE_P (TREE_TYPE (type
))
6403 && TREE_CODE (TREE_TYPE (type
)) != OFFSET_TYPE
)
6404 WALK_SUBTREE (TREE_TYPE (type
));
6405 WALK_SUBTREE (TYPE_DOMAIN (type
));
6413 WALK_SUBTREE (TYPE_MIN_VALUE (type
));
6414 WALK_SUBTREE (TYPE_MAX_VALUE (type
));
6418 WALK_SUBTREE (TREE_TYPE (type
));
6419 WALK_SUBTREE (TYPE_OFFSET_BASETYPE (type
));
6429 /* Apply FUNC to all the sub-trees of TP in a pre-order traversal. FUNC is
6430 called with the DATA and the address of each sub-tree. If FUNC returns a
6431 non-NULL value, the traversal is stopped, and the value returned by FUNC
6432 is returned. If PSET is non-NULL it is used to record the nodes visited,
6433 and to avoid visiting a node more than once. */
6436 walk_tree (tree
*tp
, walk_tree_fn func
, void *data
, struct pointer_set_t
*pset
)
6438 enum tree_code code
;
6442 #define WALK_SUBTREE_TAIL(NODE) \
6446 goto tail_recurse; \
6451 /* Skip empty subtrees. */
6455 /* Don't walk the same tree twice, if the user has requested
6456 that we avoid doing so. */
6457 if (pset
&& pointer_set_insert (pset
, *tp
))
6460 /* Call the function. */
6462 result
= (*func
) (tp
, &walk_subtrees
, data
);
6464 /* If we found something, return it. */
6468 code
= TREE_CODE (*tp
);
6470 /* Even if we didn't, FUNC may have decided that there was nothing
6471 interesting below this point in the tree. */
6474 if (code
== TREE_LIST
)
6475 /* But we still need to check our siblings. */
6476 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp
));
6481 result
= lang_hooks
.tree_inlining
.walk_subtrees (tp
, &walk_subtrees
, func
,
6483 if (result
|| ! walk_subtrees
)
6486 /* If this is a DECL_EXPR, walk into various fields of the type that it's
6487 defining. We only want to walk into these fields of a type in this
6488 case. Note that decls get walked as part of the processing of a
6491 ??? Precisely which fields of types that we are supposed to walk in
6492 this case vs. the normal case aren't well defined. */
6493 if (code
== DECL_EXPR
6494 && TREE_CODE (DECL_EXPR_DECL (*tp
)) == TYPE_DECL
6495 && TREE_CODE (TREE_TYPE (DECL_EXPR_DECL (*tp
))) != ERROR_MARK
)
6497 tree
*type_p
= &TREE_TYPE (DECL_EXPR_DECL (*tp
));
6499 /* Call the function for the type. See if it returns anything or
6500 doesn't want us to continue. If we are to continue, walk both
6501 the normal fields and those for the declaration case. */
6502 result
= (*func
) (type_p
, &walk_subtrees
, data
);
6503 if (result
|| !walk_subtrees
)
6506 result
= walk_type_fields (*type_p
, func
, data
, pset
);
6510 WALK_SUBTREE (TYPE_SIZE (*type_p
));
6511 WALK_SUBTREE (TYPE_SIZE_UNIT (*type_p
));
6513 /* If this is a record type, also walk the fields. */
6514 if (TREE_CODE (*type_p
) == RECORD_TYPE
6515 || TREE_CODE (*type_p
) == UNION_TYPE
6516 || TREE_CODE (*type_p
) == QUAL_UNION_TYPE
)
6520 for (field
= TYPE_FIELDS (*type_p
); field
;
6521 field
= TREE_CHAIN (field
))
6523 /* We'd like to look at the type of the field, but we can easily
6524 get infinite recursion. So assume it's pointed to elsewhere
6525 in the tree. Also, ignore things that aren't fields. */
6526 if (TREE_CODE (field
) != FIELD_DECL
)
6529 WALK_SUBTREE (DECL_FIELD_OFFSET (field
));
6530 WALK_SUBTREE (DECL_SIZE (field
));
6531 WALK_SUBTREE (DECL_SIZE_UNIT (field
));
6532 if (TREE_CODE (*type_p
) == QUAL_UNION_TYPE
)
6533 WALK_SUBTREE (DECL_QUALIFIER (field
));
6538 else if (code
!= SAVE_EXPR
6539 && code
!= BIND_EXPR
6540 && IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code
)))
6544 /* Walk over all the sub-trees of this operand. */
6545 len
= TREE_CODE_LENGTH (code
);
6546 /* TARGET_EXPRs are peculiar: operands 1 and 3 can be the same.
6547 But, we only want to walk once. */
6548 if (code
== TARGET_EXPR
6549 && TREE_OPERAND (*tp
, 3) == TREE_OPERAND (*tp
, 1))
6552 /* Go through the subtrees. We need to do this in forward order so
6553 that the scope of a FOR_EXPR is handled properly. */
6554 #ifdef DEBUG_WALK_TREE
6555 for (i
= 0; i
< len
; ++i
)
6556 WALK_SUBTREE (TREE_OPERAND (*tp
, i
));
6558 for (i
= 0; i
< len
- 1; ++i
)
6559 WALK_SUBTREE (TREE_OPERAND (*tp
, i
));
6563 /* The common case is that we may tail recurse here. */
6564 if (code
!= BIND_EXPR
6565 && !TREE_CHAIN (*tp
))
6566 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp
, len
- 1));
6568 WALK_SUBTREE (TREE_OPERAND (*tp
, len
- 1));
6573 /* If this is a type, walk the needed fields in the type. */
6574 else if (TYPE_P (*tp
))
6576 result
= walk_type_fields (*tp
, func
, data
, pset
);
6582 /* Not one of the easy cases. We must explicitly go through the
6587 case IDENTIFIER_NODE
:
6593 case PLACEHOLDER_EXPR
:
6597 /* None of thse have subtrees other than those already walked
6602 WALK_SUBTREE (TREE_VALUE (*tp
));
6603 WALK_SUBTREE_TAIL (TREE_CHAIN (*tp
));
6608 int len
= TREE_VEC_LENGTH (*tp
);
6613 /* Walk all elements but the first. */
6615 WALK_SUBTREE (TREE_VEC_ELT (*tp
, len
));
6617 /* Now walk the first one as a tail call. */
6618 WALK_SUBTREE_TAIL (TREE_VEC_ELT (*tp
, 0));
6622 WALK_SUBTREE (TREE_REALPART (*tp
));
6623 WALK_SUBTREE_TAIL (TREE_IMAGPART (*tp
));
6626 WALK_SUBTREE_TAIL (CONSTRUCTOR_ELTS (*tp
));
6629 WALK_SUBTREE_TAIL (TREE_OPERAND (*tp
, 0));
6634 for (decl
= BIND_EXPR_VARS (*tp
); decl
; decl
= TREE_CHAIN (decl
))
6636 /* Walk the DECL_INITIAL and DECL_SIZE. We don't want to walk
6637 into declarations that are just mentioned, rather than
6638 declared; they don't really belong to this part of the tree.
6639 And, we can see cycles: the initializer for a declaration
6640 can refer to the declaration itself. */
6641 WALK_SUBTREE (DECL_INITIAL (decl
));
6642 WALK_SUBTREE (DECL_SIZE (decl
));
6643 WALK_SUBTREE (DECL_SIZE_UNIT (decl
));
6645 WALK_SUBTREE_TAIL (BIND_EXPR_BODY (*tp
));
6648 case STATEMENT_LIST
:
6650 tree_stmt_iterator i
;
6651 for (i
= tsi_start (*tp
); !tsi_end_p (i
); tsi_next (&i
))
6652 WALK_SUBTREE (*tsi_stmt_ptr (i
));
6657 /* ??? This could be a language-defined node. We really should make
6658 a hook for it, but right now just ignore it. */
6663 /* We didn't find what we were looking for. */
6666 #undef WALK_SUBTREE_TAIL
6670 /* Like walk_tree, but does not walk duplicate nodes more than once. */
6673 walk_tree_without_duplicates (tree
*tp
, walk_tree_fn func
, void *data
)
6676 struct pointer_set_t
*pset
;
6678 pset
= pointer_set_create ();
6679 result
= walk_tree (tp
, func
, data
, pset
);
6680 pointer_set_destroy (pset
);
6684 #include "gt-tree.h"