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"
53 /* Each tree code class has an associated string representation.
54 These must correspond to the tree_code_class entries. */
56 const char *const tree_code_class_strings
[] =
70 /* obstack.[ch] explicitly declined to prototype this. */
71 extern int _obstack_allocated_p (struct obstack
*h
, void *obj
);
73 #ifdef GATHER_STATISTICS
74 /* Statistics-gathering stuff. */
76 int tree_node_counts
[(int) all_kinds
];
77 int tree_node_sizes
[(int) all_kinds
];
79 /* Keep in sync with tree.h:enum tree_node_kind. */
80 static const char * const tree_node_kind_names
[] = {
99 #endif /* GATHER_STATISTICS */
101 /* Unique id for next decl created. */
102 static GTY(()) int next_decl_uid
;
103 /* Unique id for next type created. */
104 static GTY(()) int next_type_uid
= 1;
106 /* Since we cannot rehash a type after it is in the table, we have to
107 keep the hash code. */
109 struct type_hash
GTY(())
115 /* Initial size of the hash table (rounded to next prime). */
116 #define TYPE_HASH_INITIAL_SIZE 1000
118 /* Now here is the hash table. When recording a type, it is added to
119 the slot whose index is the hash code. Note that the hash table is
120 used for several kinds of types (function types, array types and
121 array index range types, for now). While all these live in the
122 same table, they are completely independent, and the hash code is
123 computed differently for each of these. */
125 static GTY ((if_marked ("type_hash_marked_p"), param_is (struct type_hash
)))
126 htab_t type_hash_table
;
128 /* Hash table and temporary node for larger integer const values. */
129 static GTY (()) tree int_cst_node
;
130 static GTY ((if_marked ("ggc_marked_p"), param_is (union tree_node
)))
131 htab_t int_cst_hash_table
;
133 static void set_type_quals (tree
, int);
134 static int type_hash_eq (const void *, const void *);
135 static hashval_t
type_hash_hash (const void *);
136 static hashval_t
int_cst_hash_hash (const void *);
137 static int int_cst_hash_eq (const void *, const void *);
138 static void print_type_hash_statistics (void);
139 static tree
make_vector_type (tree
, int, enum machine_mode
);
140 static int type_hash_marked_p (const void *);
141 static unsigned int type_hash_list (tree
, hashval_t
);
142 static unsigned int attribute_hash_list (tree
, hashval_t
);
144 tree global_trees
[TI_MAX
];
145 tree integer_types
[itk_none
];
152 /* Initialize the hash table of types. */
153 type_hash_table
= htab_create_ggc (TYPE_HASH_INITIAL_SIZE
, type_hash_hash
,
155 int_cst_hash_table
= htab_create_ggc (1024, int_cst_hash_hash
,
156 int_cst_hash_eq
, NULL
);
157 int_cst_node
= make_node (INTEGER_CST
);
161 /* The name of the object as the assembler will see it (but before any
162 translations made by ASM_OUTPUT_LABELREF). Often this is the same
163 as DECL_NAME. It is an IDENTIFIER_NODE. */
165 decl_assembler_name (tree decl
)
167 if (!DECL_ASSEMBLER_NAME_SET_P (decl
))
168 lang_hooks
.set_decl_assembler_name (decl
);
169 return DECL_CHECK (decl
)->decl
.assembler_name
;
172 /* Compute the number of bytes occupied by a tree with code CODE.
173 This function cannot be used for TREE_VEC, PHI_NODE, or STRING_CST
174 codes, which are of variable length. */
176 tree_code_size (enum tree_code code
)
178 switch (TREE_CODE_CLASS (code
))
180 case tcc_declaration
: /* A decl node */
181 return sizeof (struct tree_decl
);
183 case tcc_type
: /* a type node */
184 return sizeof (struct tree_type
);
186 case tcc_reference
: /* a reference */
187 case tcc_expression
: /* an expression */
188 case tcc_statement
: /* an expression with side effects */
189 case tcc_comparison
: /* a comparison expression */
190 case tcc_unary
: /* a unary arithmetic expression */
191 case tcc_binary
: /* a binary arithmetic expression */
192 return (sizeof (struct tree_exp
)
193 + (TREE_CODE_LENGTH (code
) - 1) * sizeof (char *));
195 case tcc_constant
: /* a constant */
198 case INTEGER_CST
: return sizeof (struct tree_int_cst
);
199 case REAL_CST
: return sizeof (struct tree_real_cst
);
200 case COMPLEX_CST
: return sizeof (struct tree_complex
);
201 case VECTOR_CST
: return sizeof (struct tree_vector
);
202 case STRING_CST
: gcc_unreachable ();
204 return lang_hooks
.tree_size (code
);
207 case tcc_exceptional
: /* something random, like an identifier. */
210 case IDENTIFIER_NODE
: return lang_hooks
.identifier_size
;
211 case TREE_LIST
: return sizeof (struct tree_list
);
214 case PLACEHOLDER_EXPR
: return sizeof (struct tree_common
);
217 case PHI_NODE
: gcc_unreachable ();
219 case SSA_NAME
: return sizeof (struct tree_ssa_name
);
221 case STATEMENT_LIST
: return sizeof (struct tree_statement_list
);
222 case BLOCK
: return sizeof (struct tree_block
);
223 case VALUE_HANDLE
: return sizeof (struct tree_value_handle
);
226 return lang_hooks
.tree_size (code
);
234 /* Compute the number of bytes occupied by NODE. This routine only
235 looks at TREE_CODE, except for PHI_NODE and TREE_VEC nodes. */
237 tree_size (tree node
)
239 enum tree_code code
= TREE_CODE (node
);
243 return (sizeof (struct tree_phi_node
)
244 + (PHI_ARG_CAPACITY (node
) - 1) * sizeof (struct phi_arg_d
));
247 return (sizeof (struct tree_vec
)
248 + (TREE_VEC_LENGTH (node
) - 1) * sizeof(char *));
251 return sizeof (struct tree_string
) + TREE_STRING_LENGTH (node
) - 1;
254 return tree_code_size (code
);
258 /* Return a newly allocated node of code CODE. For decl and type
259 nodes, some other fields are initialized. The rest of the node is
260 initialized to zero. This function cannot be used for PHI_NODE or
261 TREE_VEC nodes, which is enforced by asserts in tree_code_size.
263 Achoo! I got a code in the node. */
266 make_node_stat (enum tree_code code MEM_STAT_DECL
)
269 enum tree_code_class type
= TREE_CODE_CLASS (code
);
270 size_t length
= tree_code_size (code
);
271 #ifdef GATHER_STATISTICS
276 case tcc_declaration
: /* A decl node */
280 case tcc_type
: /* a type node */
284 case tcc_statement
: /* an expression with side effects */
288 case tcc_reference
: /* a reference */
292 case tcc_expression
: /* an expression */
293 case tcc_comparison
: /* a comparison expression */
294 case tcc_unary
: /* a unary arithmetic expression */
295 case tcc_binary
: /* a binary arithmetic expression */
299 case tcc_constant
: /* a constant */
303 case tcc_exceptional
: /* something random, like an identifier. */
306 case IDENTIFIER_NODE
:
323 kind
= ssa_name_kind
;
340 tree_node_counts
[(int) kind
]++;
341 tree_node_sizes
[(int) kind
] += length
;
344 t
= ggc_alloc_zone_stat (length
, tree_zone PASS_MEM_STAT
);
346 memset (t
, 0, length
);
348 TREE_SET_CODE (t
, code
);
353 TREE_SIDE_EFFECTS (t
) = 1;
356 case tcc_declaration
:
357 if (code
!= FUNCTION_DECL
)
359 DECL_USER_ALIGN (t
) = 0;
360 DECL_IN_SYSTEM_HEADER (t
) = in_system_header
;
361 DECL_SOURCE_LOCATION (t
) = input_location
;
362 DECL_UID (t
) = next_decl_uid
++;
364 /* We have not yet computed the alias set for this declaration. */
365 DECL_POINTER_ALIAS_SET (t
) = -1;
369 TYPE_UID (t
) = next_type_uid
++;
370 TYPE_ALIGN (t
) = char_type_node
? TYPE_ALIGN (char_type_node
) : 0;
371 TYPE_USER_ALIGN (t
) = 0;
372 TYPE_MAIN_VARIANT (t
) = t
;
374 /* Default to no attributes for type, but let target change that. */
375 TYPE_ATTRIBUTES (t
) = NULL_TREE
;
376 targetm
.set_default_type_attributes (t
);
378 /* We have not yet computed the alias set for this type. */
379 TYPE_ALIAS_SET (t
) = -1;
383 TREE_CONSTANT (t
) = 1;
384 TREE_INVARIANT (t
) = 1;
393 case PREDECREMENT_EXPR
:
394 case PREINCREMENT_EXPR
:
395 case POSTDECREMENT_EXPR
:
396 case POSTINCREMENT_EXPR
:
397 /* All of these have side-effects, no matter what their
399 TREE_SIDE_EFFECTS (t
) = 1;
408 /* Other classes need no special treatment. */
415 /* Return a new node with the same contents as NODE except that its
416 TREE_CHAIN is zero and it has a fresh uid. */
419 copy_node_stat (tree node MEM_STAT_DECL
)
422 enum tree_code code
= TREE_CODE (node
);
425 gcc_assert (code
!= STATEMENT_LIST
);
427 length
= tree_size (node
);
428 t
= ggc_alloc_zone_stat (length
, tree_zone PASS_MEM_STAT
);
429 memcpy (t
, node
, length
);
432 TREE_ASM_WRITTEN (t
) = 0;
433 TREE_VISITED (t
) = 0;
436 if (TREE_CODE_CLASS (code
) == tcc_declaration
)
437 DECL_UID (t
) = next_decl_uid
++;
438 else if (TREE_CODE_CLASS (code
) == tcc_type
)
440 TYPE_UID (t
) = next_type_uid
++;
441 /* The following is so that the debug code for
442 the copy is different from the original type.
443 The two statements usually duplicate each other
444 (because they clear fields of the same union),
445 but the optimizer should catch that. */
446 TYPE_SYMTAB_POINTER (t
) = 0;
447 TYPE_SYMTAB_ADDRESS (t
) = 0;
449 /* Do not copy the values cache. */
450 if (TYPE_CACHED_VALUES_P(t
))
452 TYPE_CACHED_VALUES_P (t
) = 0;
453 TYPE_CACHED_VALUES (t
) = NULL_TREE
;
460 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
461 For example, this can copy a list made of TREE_LIST nodes. */
464 copy_list (tree list
)
472 head
= prev
= copy_node (list
);
473 next
= TREE_CHAIN (list
);
476 TREE_CHAIN (prev
) = copy_node (next
);
477 prev
= TREE_CHAIN (prev
);
478 next
= TREE_CHAIN (next
);
484 /* Create an INT_CST node with a LOW value sign extended. */
487 build_int_cst (tree type
, HOST_WIDE_INT low
)
489 return build_int_cst_wide (type
, low
, low
< 0 ? -1 : 0);
492 /* Create an INT_CST node with a LOW value zero extended. */
495 build_int_cstu (tree type
, unsigned HOST_WIDE_INT low
)
497 return build_int_cst_wide (type
, low
, 0);
500 /* Create an INT_CST node with a LOW value zero or sign extended depending
504 build_int_cst_type (tree type
, HOST_WIDE_INT low
)
506 unsigned HOST_WIDE_INT val
= (unsigned HOST_WIDE_INT
) low
;
513 type
= integer_type_node
;
515 bits
= TYPE_PRECISION (type
);
516 signed_p
= !TYPE_UNSIGNED (type
);
517 negative
= ((val
>> (bits
- 1)) & 1) != 0;
519 if (signed_p
&& negative
)
521 if (bits
< HOST_BITS_PER_WIDE_INT
)
522 val
= val
| ((~(unsigned HOST_WIDE_INT
) 0) << bits
);
523 ret
= build_int_cst_wide (type
, val
, ~(unsigned HOST_WIDE_INT
) 0);
527 if (bits
< HOST_BITS_PER_WIDE_INT
)
528 val
= val
& ~((~(unsigned HOST_WIDE_INT
) 0) << bits
);
529 ret
= build_int_cst_wide (type
, val
, 0);
535 /* These are the hash table functions for the hash table of INTEGER_CST
536 nodes of a sizetype. */
538 /* Return the hash code code X, an INTEGER_CST. */
541 int_cst_hash_hash (const void *x
)
545 return (TREE_INT_CST_HIGH (t
) ^ TREE_INT_CST_LOW (t
)
546 ^ htab_hash_pointer (TREE_TYPE (t
)));
549 /* Return nonzero if the value represented by *X (an INTEGER_CST tree node)
550 is the same as that given by *Y, which is the same. */
553 int_cst_hash_eq (const void *x
, const void *y
)
558 return (TREE_TYPE (xt
) == TREE_TYPE (yt
)
559 && TREE_INT_CST_HIGH (xt
) == TREE_INT_CST_HIGH (yt
)
560 && TREE_INT_CST_LOW (xt
) == TREE_INT_CST_LOW (yt
));
563 /* Create an INT_CST node of TYPE and value HI:LOW. If TYPE is NULL,
564 integer_type_node is used. The returned node is always shared.
565 For small integers we use a per-type vector cache, for larger ones
566 we use a single hash table. */
569 build_int_cst_wide (tree type
, unsigned HOST_WIDE_INT low
, HOST_WIDE_INT hi
)
576 type
= integer_type_node
;
578 switch (TREE_CODE (type
))
582 /* Cache NULL pointer. */
591 /* Cache false or true. */
600 if (TYPE_UNSIGNED (type
))
603 limit
= INTEGER_SHARE_LIMIT
;
604 if (!hi
&& low
< (unsigned HOST_WIDE_INT
)INTEGER_SHARE_LIMIT
)
610 limit
= INTEGER_SHARE_LIMIT
+ 1;
611 if (!hi
&& low
< (unsigned HOST_WIDE_INT
)INTEGER_SHARE_LIMIT
)
613 else if (hi
== -1 && low
== -(unsigned HOST_WIDE_INT
)1)
623 /* Look for it in the type's vector of small shared ints. */
624 if (!TYPE_CACHED_VALUES_P (type
))
626 TYPE_CACHED_VALUES_P (type
) = 1;
627 TYPE_CACHED_VALUES (type
) = make_tree_vec (limit
);
630 t
= TREE_VEC_ELT (TYPE_CACHED_VALUES (type
), ix
);
633 /* Make sure no one is clobbering the shared constant. */
634 gcc_assert (TREE_TYPE (t
) == type
);
635 gcc_assert (TREE_INT_CST_LOW (t
) == low
);
636 gcc_assert (TREE_INT_CST_HIGH (t
) == hi
);
640 /* Create a new shared int. */
641 t
= make_node (INTEGER_CST
);
643 TREE_INT_CST_LOW (t
) = low
;
644 TREE_INT_CST_HIGH (t
) = hi
;
645 TREE_TYPE (t
) = type
;
647 TREE_VEC_ELT (TYPE_CACHED_VALUES (type
), ix
) = t
;
652 /* Use the cache of larger shared ints. */
655 TREE_INT_CST_LOW (int_cst_node
) = low
;
656 TREE_INT_CST_HIGH (int_cst_node
) = hi
;
657 TREE_TYPE (int_cst_node
) = type
;
659 slot
= htab_find_slot (int_cst_hash_table
, int_cst_node
, INSERT
);
663 /* Insert this one into the hash table. */
666 /* Make a new node for next time round. */
667 int_cst_node
= make_node (INTEGER_CST
);
674 /* Builds an integer constant in TYPE such that lowest BITS bits are ones
675 and the rest are zeros. */
678 build_low_bits_mask (tree type
, unsigned bits
)
680 unsigned HOST_WIDE_INT low
;
682 unsigned HOST_WIDE_INT all_ones
= ~(unsigned HOST_WIDE_INT
) 0;
684 gcc_assert (bits
<= TYPE_PRECISION (type
));
686 if (bits
== TYPE_PRECISION (type
)
687 && !TYPE_UNSIGNED (type
))
689 /* Sign extended all-ones mask. */
693 else if (bits
<= HOST_BITS_PER_WIDE_INT
)
695 low
= all_ones
>> (HOST_BITS_PER_WIDE_INT
- bits
);
700 bits
-= HOST_BITS_PER_WIDE_INT
;
702 high
= all_ones
>> (HOST_BITS_PER_WIDE_INT
- bits
);
705 return build_int_cst_wide (type
, low
, high
);
708 /* Checks that X is integer constant that can be expressed in (unsigned)
709 HOST_WIDE_INT without loss of precision. */
712 cst_and_fits_in_hwi (tree x
)
714 if (TREE_CODE (x
) != INTEGER_CST
)
717 if (TYPE_PRECISION (TREE_TYPE (x
)) > HOST_BITS_PER_WIDE_INT
)
720 return (TREE_INT_CST_HIGH (x
) == 0
721 || TREE_INT_CST_HIGH (x
) == -1);
724 /* Return a new VECTOR_CST node whose type is TYPE and whose values
725 are in a list pointed by VALS. */
728 build_vector (tree type
, tree vals
)
730 tree v
= make_node (VECTOR_CST
);
731 int over1
= 0, over2
= 0;
734 TREE_VECTOR_CST_ELTS (v
) = vals
;
735 TREE_TYPE (v
) = type
;
737 /* Iterate through elements and check for overflow. */
738 for (link
= vals
; link
; link
= TREE_CHAIN (link
))
740 tree value
= TREE_VALUE (link
);
742 over1
|= TREE_OVERFLOW (value
);
743 over2
|= TREE_CONSTANT_OVERFLOW (value
);
746 TREE_OVERFLOW (v
) = over1
;
747 TREE_CONSTANT_OVERFLOW (v
) = over2
;
752 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
753 are in a list pointed to by VALS. */
755 build_constructor (tree type
, tree vals
)
757 tree c
= make_node (CONSTRUCTOR
);
758 TREE_TYPE (c
) = type
;
759 CONSTRUCTOR_ELTS (c
) = vals
;
761 /* ??? May not be necessary. Mirrors what build does. */
764 TREE_SIDE_EFFECTS (c
) = TREE_SIDE_EFFECTS (vals
);
765 TREE_READONLY (c
) = TREE_READONLY (vals
);
766 TREE_CONSTANT (c
) = TREE_CONSTANT (vals
);
767 TREE_INVARIANT (c
) = TREE_INVARIANT (vals
);
773 /* Return a new REAL_CST node whose type is TYPE and value is D. */
776 build_real (tree type
, REAL_VALUE_TYPE d
)
782 /* ??? Used to check for overflow here via CHECK_FLOAT_TYPE.
783 Consider doing it via real_convert now. */
785 v
= make_node (REAL_CST
);
786 dp
= ggc_alloc (sizeof (REAL_VALUE_TYPE
));
787 memcpy (dp
, &d
, sizeof (REAL_VALUE_TYPE
));
789 TREE_TYPE (v
) = type
;
790 TREE_REAL_CST_PTR (v
) = dp
;
791 TREE_OVERFLOW (v
) = TREE_CONSTANT_OVERFLOW (v
) = overflow
;
795 /* Return a new REAL_CST node whose type is TYPE
796 and whose value is the integer value of the INTEGER_CST node I. */
799 real_value_from_int_cst (tree type
, tree i
)
803 /* Clear all bits of the real value type so that we can later do
804 bitwise comparisons to see if two values are the same. */
805 memset (&d
, 0, sizeof d
);
807 real_from_integer (&d
, type
? TYPE_MODE (type
) : VOIDmode
,
808 TREE_INT_CST_LOW (i
), TREE_INT_CST_HIGH (i
),
809 TYPE_UNSIGNED (TREE_TYPE (i
)));
813 /* Given a tree representing an integer constant I, return a tree
814 representing the same value as a floating-point constant of type TYPE. */
817 build_real_from_int_cst (tree type
, tree i
)
820 int overflow
= TREE_OVERFLOW (i
);
822 v
= build_real (type
, real_value_from_int_cst (type
, i
));
824 TREE_OVERFLOW (v
) |= overflow
;
825 TREE_CONSTANT_OVERFLOW (v
) |= overflow
;
829 /* Return a newly constructed STRING_CST node whose value is
830 the LEN characters at STR.
831 The TREE_TYPE is not initialized. */
834 build_string (int len
, const char *str
)
839 length
= len
+ sizeof (struct tree_string
);
841 #ifdef GATHER_STATISTICS
842 tree_node_counts
[(int) c_kind
]++;
843 tree_node_sizes
[(int) c_kind
] += length
;
846 s
= ggc_alloc_tree (length
);
848 memset (s
, 0, sizeof (struct tree_common
));
849 TREE_SET_CODE (s
, STRING_CST
);
850 TREE_STRING_LENGTH (s
) = len
;
851 memcpy ((char *) TREE_STRING_POINTER (s
), str
, len
);
852 ((char *) TREE_STRING_POINTER (s
))[len
] = '\0';
857 /* Return a newly constructed COMPLEX_CST node whose value is
858 specified by the real and imaginary parts REAL and IMAG.
859 Both REAL and IMAG should be constant nodes. TYPE, if specified,
860 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
863 build_complex (tree type
, tree real
, tree imag
)
865 tree t
= make_node (COMPLEX_CST
);
867 TREE_REALPART (t
) = real
;
868 TREE_IMAGPART (t
) = imag
;
869 TREE_TYPE (t
) = type
? type
: build_complex_type (TREE_TYPE (real
));
870 TREE_OVERFLOW (t
) = TREE_OVERFLOW (real
) | TREE_OVERFLOW (imag
);
871 TREE_CONSTANT_OVERFLOW (t
)
872 = TREE_CONSTANT_OVERFLOW (real
) | TREE_CONSTANT_OVERFLOW (imag
);
876 /* Build a BINFO with LEN language slots. */
879 make_tree_binfo_stat (unsigned base_binfos MEM_STAT_DECL
)
882 size_t length
= (offsetof (struct tree_binfo
, base_binfos
)
883 + VEC_embedded_size (tree
, base_binfos
));
885 #ifdef GATHER_STATISTICS
886 tree_node_counts
[(int) binfo_kind
]++;
887 tree_node_sizes
[(int) binfo_kind
] += length
;
890 t
= ggc_alloc_zone_stat (length
, tree_zone PASS_MEM_STAT
);
892 memset (t
, 0, offsetof (struct tree_binfo
, base_binfos
));
894 TREE_SET_CODE (t
, TREE_BINFO
);
896 VEC_embedded_init (tree
, BINFO_BASE_BINFOS (t
), base_binfos
);
902 /* Build a newly constructed TREE_VEC node of length LEN. */
905 make_tree_vec_stat (int len MEM_STAT_DECL
)
908 int length
= (len
- 1) * sizeof (tree
) + sizeof (struct tree_vec
);
910 #ifdef GATHER_STATISTICS
911 tree_node_counts
[(int) vec_kind
]++;
912 tree_node_sizes
[(int) vec_kind
] += length
;
915 t
= ggc_alloc_zone_stat (length
, tree_zone PASS_MEM_STAT
);
917 memset (t
, 0, length
);
919 TREE_SET_CODE (t
, TREE_VEC
);
920 TREE_VEC_LENGTH (t
) = len
;
925 /* Return 1 if EXPR is the integer constant zero or a complex constant
929 integer_zerop (tree expr
)
933 return ((TREE_CODE (expr
) == INTEGER_CST
934 && ! TREE_CONSTANT_OVERFLOW (expr
)
935 && TREE_INT_CST_LOW (expr
) == 0
936 && TREE_INT_CST_HIGH (expr
) == 0)
937 || (TREE_CODE (expr
) == COMPLEX_CST
938 && integer_zerop (TREE_REALPART (expr
))
939 && integer_zerop (TREE_IMAGPART (expr
))));
942 /* Return 1 if EXPR is the integer constant one or the corresponding
946 integer_onep (tree expr
)
950 return ((TREE_CODE (expr
) == INTEGER_CST
951 && ! TREE_CONSTANT_OVERFLOW (expr
)
952 && TREE_INT_CST_LOW (expr
) == 1
953 && TREE_INT_CST_HIGH (expr
) == 0)
954 || (TREE_CODE (expr
) == COMPLEX_CST
955 && integer_onep (TREE_REALPART (expr
))
956 && integer_zerop (TREE_IMAGPART (expr
))));
959 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
960 it contains. Likewise for the corresponding complex constant. */
963 integer_all_onesp (tree expr
)
970 if (TREE_CODE (expr
) == COMPLEX_CST
971 && integer_all_onesp (TREE_REALPART (expr
))
972 && integer_zerop (TREE_IMAGPART (expr
)))
975 else if (TREE_CODE (expr
) != INTEGER_CST
976 || TREE_CONSTANT_OVERFLOW (expr
))
979 uns
= TYPE_UNSIGNED (TREE_TYPE (expr
));
981 return (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
982 && TREE_INT_CST_HIGH (expr
) == -1);
984 /* Note that using TYPE_PRECISION here is wrong. We care about the
985 actual bits, not the (arbitrary) range of the type. */
986 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr
)));
987 if (prec
>= HOST_BITS_PER_WIDE_INT
)
989 HOST_WIDE_INT high_value
;
992 shift_amount
= prec
- HOST_BITS_PER_WIDE_INT
;
994 /* Can not handle precisions greater than twice the host int size. */
995 gcc_assert (shift_amount
<= HOST_BITS_PER_WIDE_INT
);
996 if (shift_amount
== HOST_BITS_PER_WIDE_INT
)
997 /* Shifting by the host word size is undefined according to the ANSI
998 standard, so we must handle this as a special case. */
1001 high_value
= ((HOST_WIDE_INT
) 1 << shift_amount
) - 1;
1003 return (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
1004 && TREE_INT_CST_HIGH (expr
) == high_value
);
1007 return TREE_INT_CST_LOW (expr
) == ((unsigned HOST_WIDE_INT
) 1 << prec
) - 1;
1010 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
1014 integer_pow2p (tree expr
)
1017 HOST_WIDE_INT high
, low
;
1021 if (TREE_CODE (expr
) == COMPLEX_CST
1022 && integer_pow2p (TREE_REALPART (expr
))
1023 && integer_zerop (TREE_IMAGPART (expr
)))
1026 if (TREE_CODE (expr
) != INTEGER_CST
|| TREE_CONSTANT_OVERFLOW (expr
))
1029 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
1030 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
1031 high
= TREE_INT_CST_HIGH (expr
);
1032 low
= TREE_INT_CST_LOW (expr
);
1034 /* First clear all bits that are beyond the type's precision in case
1035 we've been sign extended. */
1037 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
1039 else if (prec
> HOST_BITS_PER_WIDE_INT
)
1040 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
1044 if (prec
< HOST_BITS_PER_WIDE_INT
)
1045 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
1048 if (high
== 0 && low
== 0)
1051 return ((high
== 0 && (low
& (low
- 1)) == 0)
1052 || (low
== 0 && (high
& (high
- 1)) == 0));
1055 /* Return 1 if EXPR is an integer constant other than zero or a
1056 complex constant other than zero. */
1059 integer_nonzerop (tree expr
)
1063 return ((TREE_CODE (expr
) == INTEGER_CST
1064 && ! TREE_CONSTANT_OVERFLOW (expr
)
1065 && (TREE_INT_CST_LOW (expr
) != 0
1066 || TREE_INT_CST_HIGH (expr
) != 0))
1067 || (TREE_CODE (expr
) == COMPLEX_CST
1068 && (integer_nonzerop (TREE_REALPART (expr
))
1069 || integer_nonzerop (TREE_IMAGPART (expr
)))));
1072 /* Return the power of two represented by a tree node known to be a
1076 tree_log2 (tree expr
)
1079 HOST_WIDE_INT high
, low
;
1083 if (TREE_CODE (expr
) == COMPLEX_CST
)
1084 return tree_log2 (TREE_REALPART (expr
));
1086 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
1087 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
1089 high
= TREE_INT_CST_HIGH (expr
);
1090 low
= TREE_INT_CST_LOW (expr
);
1092 /* First clear all bits that are beyond the type's precision in case
1093 we've been sign extended. */
1095 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
1097 else if (prec
> HOST_BITS_PER_WIDE_INT
)
1098 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
1102 if (prec
< HOST_BITS_PER_WIDE_INT
)
1103 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
1106 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ exact_log2 (high
)
1107 : exact_log2 (low
));
1110 /* Similar, but return the largest integer Y such that 2 ** Y is less
1111 than or equal to EXPR. */
1114 tree_floor_log2 (tree expr
)
1117 HOST_WIDE_INT high
, low
;
1121 if (TREE_CODE (expr
) == COMPLEX_CST
)
1122 return tree_log2 (TREE_REALPART (expr
));
1124 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
1125 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
1127 high
= TREE_INT_CST_HIGH (expr
);
1128 low
= TREE_INT_CST_LOW (expr
);
1130 /* First clear all bits that are beyond the type's precision in case
1131 we've been sign extended. Ignore if type's precision hasn't been set
1132 since what we are doing is setting it. */
1134 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
|| prec
== 0)
1136 else if (prec
> HOST_BITS_PER_WIDE_INT
)
1137 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
1141 if (prec
< HOST_BITS_PER_WIDE_INT
)
1142 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
1145 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ floor_log2 (high
)
1146 : floor_log2 (low
));
1149 /* Return 1 if EXPR is the real constant zero. */
1152 real_zerop (tree expr
)
1156 return ((TREE_CODE (expr
) == REAL_CST
1157 && ! TREE_CONSTANT_OVERFLOW (expr
)
1158 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst0
))
1159 || (TREE_CODE (expr
) == COMPLEX_CST
1160 && real_zerop (TREE_REALPART (expr
))
1161 && real_zerop (TREE_IMAGPART (expr
))));
1164 /* Return 1 if EXPR is the real constant one in real or complex form. */
1167 real_onep (tree expr
)
1171 return ((TREE_CODE (expr
) == REAL_CST
1172 && ! TREE_CONSTANT_OVERFLOW (expr
)
1173 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst1
))
1174 || (TREE_CODE (expr
) == COMPLEX_CST
1175 && real_onep (TREE_REALPART (expr
))
1176 && real_zerop (TREE_IMAGPART (expr
))));
1179 /* Return 1 if EXPR is the real constant two. */
1182 real_twop (tree expr
)
1186 return ((TREE_CODE (expr
) == REAL_CST
1187 && ! TREE_CONSTANT_OVERFLOW (expr
)
1188 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst2
))
1189 || (TREE_CODE (expr
) == COMPLEX_CST
1190 && real_twop (TREE_REALPART (expr
))
1191 && real_zerop (TREE_IMAGPART (expr
))));
1194 /* Return 1 if EXPR is the real constant minus one. */
1197 real_minus_onep (tree expr
)
1201 return ((TREE_CODE (expr
) == REAL_CST
1202 && ! TREE_CONSTANT_OVERFLOW (expr
)
1203 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconstm1
))
1204 || (TREE_CODE (expr
) == COMPLEX_CST
1205 && real_minus_onep (TREE_REALPART (expr
))
1206 && real_zerop (TREE_IMAGPART (expr
))));
1209 /* Nonzero if EXP is a constant or a cast of a constant. */
1212 really_constant_p (tree exp
)
1214 /* This is not quite the same as STRIP_NOPS. It does more. */
1215 while (TREE_CODE (exp
) == NOP_EXPR
1216 || TREE_CODE (exp
) == CONVERT_EXPR
1217 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
1218 exp
= TREE_OPERAND (exp
, 0);
1219 return TREE_CONSTANT (exp
);
1222 /* Return first list element whose TREE_VALUE is ELEM.
1223 Return 0 if ELEM is not in LIST. */
1226 value_member (tree elem
, tree list
)
1230 if (elem
== TREE_VALUE (list
))
1232 list
= TREE_CHAIN (list
);
1237 /* Return first list element whose TREE_PURPOSE is ELEM.
1238 Return 0 if ELEM is not in LIST. */
1241 purpose_member (tree elem
, tree list
)
1245 if (elem
== TREE_PURPOSE (list
))
1247 list
= TREE_CHAIN (list
);
1252 /* Return nonzero if ELEM is part of the chain CHAIN. */
1255 chain_member (tree elem
, tree chain
)
1261 chain
= TREE_CHAIN (chain
);
1267 /* Return the length of a chain of nodes chained through TREE_CHAIN.
1268 We expect a null pointer to mark the end of the chain.
1269 This is the Lisp primitive `length'. */
1272 list_length (tree t
)
1275 #ifdef ENABLE_TREE_CHECKING
1283 #ifdef ENABLE_TREE_CHECKING
1286 gcc_assert (p
!= q
);
1294 /* Returns the number of FIELD_DECLs in TYPE. */
1297 fields_length (tree type
)
1299 tree t
= TYPE_FIELDS (type
);
1302 for (; t
; t
= TREE_CHAIN (t
))
1303 if (TREE_CODE (t
) == FIELD_DECL
)
1309 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
1310 by modifying the last node in chain 1 to point to chain 2.
1311 This is the Lisp primitive `nconc'. */
1314 chainon (tree op1
, tree op2
)
1323 for (t1
= op1
; TREE_CHAIN (t1
); t1
= TREE_CHAIN (t1
))
1325 TREE_CHAIN (t1
) = op2
;
1327 #ifdef ENABLE_TREE_CHECKING
1330 for (t2
= op2
; t2
; t2
= TREE_CHAIN (t2
))
1331 gcc_assert (t2
!= t1
);
1338 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
1341 tree_last (tree chain
)
1345 while ((next
= TREE_CHAIN (chain
)))
1350 /* Reverse the order of elements in the chain T,
1351 and return the new head of the chain (old last element). */
1356 tree prev
= 0, decl
, next
;
1357 for (decl
= t
; decl
; decl
= next
)
1359 next
= TREE_CHAIN (decl
);
1360 TREE_CHAIN (decl
) = prev
;
1366 /* Return a newly created TREE_LIST node whose
1367 purpose and value fields are PARM and VALUE. */
1370 build_tree_list_stat (tree parm
, tree value MEM_STAT_DECL
)
1372 tree t
= make_node_stat (TREE_LIST PASS_MEM_STAT
);
1373 TREE_PURPOSE (t
) = parm
;
1374 TREE_VALUE (t
) = value
;
1378 /* Return a newly created TREE_LIST node whose
1379 purpose and value fields are PURPOSE and VALUE
1380 and whose TREE_CHAIN is CHAIN. */
1383 tree_cons_stat (tree purpose
, tree value
, tree chain MEM_STAT_DECL
)
1387 node
= ggc_alloc_zone_stat (sizeof (struct tree_list
),
1388 tree_zone PASS_MEM_STAT
);
1390 memset (node
, 0, sizeof (struct tree_common
));
1392 #ifdef GATHER_STATISTICS
1393 tree_node_counts
[(int) x_kind
]++;
1394 tree_node_sizes
[(int) x_kind
] += sizeof (struct tree_list
);
1397 TREE_SET_CODE (node
, TREE_LIST
);
1398 TREE_CHAIN (node
) = chain
;
1399 TREE_PURPOSE (node
) = purpose
;
1400 TREE_VALUE (node
) = value
;
1405 /* Return the size nominally occupied by an object of type TYPE
1406 when it resides in memory. The value is measured in units of bytes,
1407 and its data type is that normally used for type sizes
1408 (which is the first type created by make_signed_type or
1409 make_unsigned_type). */
1412 size_in_bytes (tree type
)
1416 if (type
== error_mark_node
)
1417 return integer_zero_node
;
1419 type
= TYPE_MAIN_VARIANT (type
);
1420 t
= TYPE_SIZE_UNIT (type
);
1424 lang_hooks
.types
.incomplete_type_error (NULL_TREE
, type
);
1425 return size_zero_node
;
1428 if (TREE_CODE (t
) == INTEGER_CST
)
1429 t
= force_fit_type (t
, 0, false, false);
1434 /* Return the size of TYPE (in bytes) as a wide integer
1435 or return -1 if the size can vary or is larger than an integer. */
1438 int_size_in_bytes (tree type
)
1442 if (type
== error_mark_node
)
1445 type
= TYPE_MAIN_VARIANT (type
);
1446 t
= TYPE_SIZE_UNIT (type
);
1448 || TREE_CODE (t
) != INTEGER_CST
1449 || TREE_OVERFLOW (t
)
1450 || TREE_INT_CST_HIGH (t
) != 0
1451 /* If the result would appear negative, it's too big to represent. */
1452 || (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0)
1455 return TREE_INT_CST_LOW (t
);
1458 /* Return the bit position of FIELD, in bits from the start of the record.
1459 This is a tree of type bitsizetype. */
1462 bit_position (tree field
)
1464 return bit_from_pos (DECL_FIELD_OFFSET (field
),
1465 DECL_FIELD_BIT_OFFSET (field
));
1468 /* Likewise, but return as an integer. Abort if it cannot be represented
1469 in that way (since it could be a signed value, we don't have the option
1470 of returning -1 like int_size_in_byte can. */
1473 int_bit_position (tree field
)
1475 return tree_low_cst (bit_position (field
), 0);
1478 /* Return the byte position of FIELD, in bytes from the start of the record.
1479 This is a tree of type sizetype. */
1482 byte_position (tree field
)
1484 return byte_from_pos (DECL_FIELD_OFFSET (field
),
1485 DECL_FIELD_BIT_OFFSET (field
));
1488 /* Likewise, but return as an integer. Abort if it cannot be represented
1489 in that way (since it could be a signed value, we don't have the option
1490 of returning -1 like int_size_in_byte can. */
1493 int_byte_position (tree field
)
1495 return tree_low_cst (byte_position (field
), 0);
1498 /* Return the strictest alignment, in bits, that T is known to have. */
1503 unsigned int align0
, align1
;
1505 switch (TREE_CODE (t
))
1507 case NOP_EXPR
: case CONVERT_EXPR
: case NON_LVALUE_EXPR
:
1508 /* If we have conversions, we know that the alignment of the
1509 object must meet each of the alignments of the types. */
1510 align0
= expr_align (TREE_OPERAND (t
, 0));
1511 align1
= TYPE_ALIGN (TREE_TYPE (t
));
1512 return MAX (align0
, align1
);
1514 case SAVE_EXPR
: case COMPOUND_EXPR
: case MODIFY_EXPR
:
1515 case INIT_EXPR
: case TARGET_EXPR
: case WITH_CLEANUP_EXPR
:
1516 case CLEANUP_POINT_EXPR
:
1517 /* These don't change the alignment of an object. */
1518 return expr_align (TREE_OPERAND (t
, 0));
1521 /* The best we can do is say that the alignment is the least aligned
1523 align0
= expr_align (TREE_OPERAND (t
, 1));
1524 align1
= expr_align (TREE_OPERAND (t
, 2));
1525 return MIN (align0
, align1
);
1527 case LABEL_DECL
: case CONST_DECL
:
1528 case VAR_DECL
: case PARM_DECL
: case RESULT_DECL
:
1529 if (DECL_ALIGN (t
) != 0)
1530 return DECL_ALIGN (t
);
1534 return FUNCTION_BOUNDARY
;
1540 /* Otherwise take the alignment from that of the type. */
1541 return TYPE_ALIGN (TREE_TYPE (t
));
1544 /* Return, as a tree node, the number of elements for TYPE (which is an
1545 ARRAY_TYPE) minus one. This counts only elements of the top array. */
1548 array_type_nelts (tree type
)
1550 tree index_type
, min
, max
;
1552 /* If they did it with unspecified bounds, then we should have already
1553 given an error about it before we got here. */
1554 if (! TYPE_DOMAIN (type
))
1555 return error_mark_node
;
1557 index_type
= TYPE_DOMAIN (type
);
1558 min
= TYPE_MIN_VALUE (index_type
);
1559 max
= TYPE_MAX_VALUE (index_type
);
1561 return (integer_zerop (min
)
1563 : fold (build2 (MINUS_EXPR
, TREE_TYPE (max
), max
, min
)));
1566 /* If arg is static -- a reference to an object in static storage -- then
1567 return the object. This is not the same as the C meaning of `static'.
1568 If arg isn't static, return NULL. */
1573 switch (TREE_CODE (arg
))
1576 /* Nested functions are static, even though taking their address will
1577 involve a trampoline as we unnest the nested function and create
1578 the trampoline on the tree level. */
1582 return ((TREE_STATIC (arg
) || DECL_EXTERNAL (arg
))
1583 && ! DECL_THREAD_LOCAL (arg
)
1584 && ! DECL_NON_ADDR_CONST_P (arg
)
1588 return ((TREE_STATIC (arg
) || DECL_EXTERNAL (arg
))
1592 return TREE_STATIC (arg
) ? arg
: NULL
;
1599 /* If the thing being referenced is not a field, then it is
1600 something language specific. */
1601 if (TREE_CODE (TREE_OPERAND (arg
, 1)) != FIELD_DECL
)
1602 return (*lang_hooks
.staticp
) (arg
);
1604 /* If we are referencing a bitfield, we can't evaluate an
1605 ADDR_EXPR at compile time and so it isn't a constant. */
1606 if (DECL_BIT_FIELD (TREE_OPERAND (arg
, 1)))
1609 return staticp (TREE_OPERAND (arg
, 0));
1614 case MISALIGNED_INDIRECT_REF
:
1615 case ALIGN_INDIRECT_REF
:
1617 return TREE_CONSTANT (TREE_OPERAND (arg
, 0)) ? arg
: NULL
;
1620 case ARRAY_RANGE_REF
:
1621 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg
))) == INTEGER_CST
1622 && TREE_CODE (TREE_OPERAND (arg
, 1)) == INTEGER_CST
)
1623 return staticp (TREE_OPERAND (arg
, 0));
1628 if ((unsigned int) TREE_CODE (arg
)
1629 >= (unsigned int) LAST_AND_UNUSED_TREE_CODE
)
1630 return lang_hooks
.staticp (arg
);
1636 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
1637 Do this to any expression which may be used in more than one place,
1638 but must be evaluated only once.
1640 Normally, expand_expr would reevaluate the expression each time.
1641 Calling save_expr produces something that is evaluated and recorded
1642 the first time expand_expr is called on it. Subsequent calls to
1643 expand_expr just reuse the recorded value.
1645 The call to expand_expr that generates code that actually computes
1646 the value is the first call *at compile time*. Subsequent calls
1647 *at compile time* generate code to use the saved value.
1648 This produces correct result provided that *at run time* control
1649 always flows through the insns made by the first expand_expr
1650 before reaching the other places where the save_expr was evaluated.
1651 You, the caller of save_expr, must make sure this is so.
1653 Constants, and certain read-only nodes, are returned with no
1654 SAVE_EXPR because that is safe. Expressions containing placeholders
1655 are not touched; see tree.def for an explanation of what these
1659 save_expr (tree expr
)
1661 tree t
= fold (expr
);
1664 /* If the tree evaluates to a constant, then we don't want to hide that
1665 fact (i.e. this allows further folding, and direct checks for constants).
1666 However, a read-only object that has side effects cannot be bypassed.
1667 Since it is no problem to reevaluate literals, we just return the
1669 inner
= skip_simple_arithmetic (t
);
1671 if (TREE_INVARIANT (inner
)
1672 || (TREE_READONLY (inner
) && ! TREE_SIDE_EFFECTS (inner
))
1673 || TREE_CODE (inner
) == SAVE_EXPR
1674 || TREE_CODE (inner
) == ERROR_MARK
)
1677 /* If INNER contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
1678 it means that the size or offset of some field of an object depends on
1679 the value within another field.
1681 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
1682 and some variable since it would then need to be both evaluated once and
1683 evaluated more than once. Front-ends must assure this case cannot
1684 happen by surrounding any such subexpressions in their own SAVE_EXPR
1685 and forcing evaluation at the proper time. */
1686 if (contains_placeholder_p (inner
))
1689 t
= build1 (SAVE_EXPR
, TREE_TYPE (expr
), t
);
1691 /* This expression might be placed ahead of a jump to ensure that the
1692 value was computed on both sides of the jump. So make sure it isn't
1693 eliminated as dead. */
1694 TREE_SIDE_EFFECTS (t
) = 1;
1695 TREE_INVARIANT (t
) = 1;
1699 /* Look inside EXPR and into any simple arithmetic operations. Return
1700 the innermost non-arithmetic node. */
1703 skip_simple_arithmetic (tree expr
)
1707 /* We don't care about whether this can be used as an lvalue in this
1709 while (TREE_CODE (expr
) == NON_LVALUE_EXPR
)
1710 expr
= TREE_OPERAND (expr
, 0);
1712 /* If we have simple operations applied to a SAVE_EXPR or to a SAVE_EXPR and
1713 a constant, it will be more efficient to not make another SAVE_EXPR since
1714 it will allow better simplification and GCSE will be able to merge the
1715 computations if they actually occur. */
1719 if (UNARY_CLASS_P (inner
))
1720 inner
= TREE_OPERAND (inner
, 0);
1721 else if (BINARY_CLASS_P (inner
))
1723 if (TREE_INVARIANT (TREE_OPERAND (inner
, 1)))
1724 inner
= TREE_OPERAND (inner
, 0);
1725 else if (TREE_INVARIANT (TREE_OPERAND (inner
, 0)))
1726 inner
= TREE_OPERAND (inner
, 1);
1737 /* Return which tree structure is used by T. */
1739 enum tree_node_structure_enum
1740 tree_node_structure (tree t
)
1742 enum tree_code code
= TREE_CODE (t
);
1744 switch (TREE_CODE_CLASS (code
))
1746 case tcc_declaration
:
1751 case tcc_comparison
:
1754 case tcc_expression
:
1757 default: /* tcc_constant and tcc_exceptional */
1762 /* tcc_constant cases. */
1763 case INTEGER_CST
: return TS_INT_CST
;
1764 case REAL_CST
: return TS_REAL_CST
;
1765 case COMPLEX_CST
: return TS_COMPLEX
;
1766 case VECTOR_CST
: return TS_VECTOR
;
1767 case STRING_CST
: return TS_STRING
;
1768 /* tcc_exceptional cases. */
1769 case ERROR_MARK
: return TS_COMMON
;
1770 case IDENTIFIER_NODE
: return TS_IDENTIFIER
;
1771 case TREE_LIST
: return TS_LIST
;
1772 case TREE_VEC
: return TS_VEC
;
1773 case PHI_NODE
: return TS_PHI_NODE
;
1774 case SSA_NAME
: return TS_SSA_NAME
;
1775 case PLACEHOLDER_EXPR
: return TS_COMMON
;
1776 case STATEMENT_LIST
: return TS_STATEMENT_LIST
;
1777 case BLOCK
: return TS_BLOCK
;
1778 case TREE_BINFO
: return TS_BINFO
;
1779 case VALUE_HANDLE
: return TS_VALUE_HANDLE
;
1786 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
1787 or offset that depends on a field within a record. */
1790 contains_placeholder_p (tree exp
)
1792 enum tree_code code
;
1797 code
= TREE_CODE (exp
);
1798 if (code
== PLACEHOLDER_EXPR
)
1801 switch (TREE_CODE_CLASS (code
))
1804 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
1805 position computations since they will be converted into a
1806 WITH_RECORD_EXPR involving the reference, which will assume
1807 here will be valid. */
1808 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0));
1810 case tcc_exceptional
:
1811 if (code
== TREE_LIST
)
1812 return (CONTAINS_PLACEHOLDER_P (TREE_VALUE (exp
))
1813 || CONTAINS_PLACEHOLDER_P (TREE_CHAIN (exp
)));
1818 case tcc_comparison
:
1819 case tcc_expression
:
1823 /* Ignoring the first operand isn't quite right, but works best. */
1824 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1));
1827 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0))
1828 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1))
1829 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 2)));
1835 switch (TREE_CODE_LENGTH (code
))
1838 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0));
1840 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0))
1841 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1)));
1852 /* Return true if any part of the computation of TYPE involves a
1853 PLACEHOLDER_EXPR. This includes size, bounds, qualifiers
1854 (for QUAL_UNION_TYPE) and field positions. */
1857 type_contains_placeholder_1 (tree type
)
1859 /* If the size contains a placeholder or the parent type (component type in
1860 the case of arrays) type involves a placeholder, this type does. */
1861 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type
))
1862 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (type
))
1863 || (TREE_TYPE (type
) != 0
1864 && type_contains_placeholder_p (TREE_TYPE (type
))))
1867 /* Now do type-specific checks. Note that the last part of the check above
1868 greatly limits what we have to do below. */
1869 switch (TREE_CODE (type
))
1878 case REFERENCE_TYPE
:
1887 /* Here we just check the bounds. */
1888 return (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (type
))
1889 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (type
)));
1892 /* We're already checked the component type (TREE_TYPE), so just check
1894 return type_contains_placeholder_p (TYPE_DOMAIN (type
));
1898 case QUAL_UNION_TYPE
:
1902 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
1903 if (TREE_CODE (field
) == FIELD_DECL
1904 && (CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (field
))
1905 || (TREE_CODE (type
) == QUAL_UNION_TYPE
1906 && CONTAINS_PLACEHOLDER_P (DECL_QUALIFIER (field
)))
1907 || type_contains_placeholder_p (TREE_TYPE (field
))))
1919 type_contains_placeholder_p (tree type
)
1923 /* If the contains_placeholder_bits field has been initialized,
1924 then we know the answer. */
1925 if (TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) > 0)
1926 return TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) - 1;
1928 /* Indicate that we've seen this type node, and the answer is false.
1929 This is what we want to return if we run into recursion via fields. */
1930 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) = 1;
1932 /* Compute the real value. */
1933 result
= type_contains_placeholder_1 (type
);
1935 /* Store the real value. */
1936 TYPE_CONTAINS_PLACEHOLDER_INTERNAL (type
) = result
+ 1;
1941 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
1942 return a tree with all occurrences of references to F in a
1943 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
1944 contains only arithmetic expressions or a CALL_EXPR with a
1945 PLACEHOLDER_EXPR occurring only in its arglist. */
1948 substitute_in_expr (tree exp
, tree f
, tree r
)
1950 enum tree_code code
= TREE_CODE (exp
);
1955 /* We handle TREE_LIST and COMPONENT_REF separately. */
1956 if (code
== TREE_LIST
)
1958 op0
= SUBSTITUTE_IN_EXPR (TREE_CHAIN (exp
), f
, r
);
1959 op1
= SUBSTITUTE_IN_EXPR (TREE_VALUE (exp
), f
, r
);
1960 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
1963 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
1965 else if (code
== COMPONENT_REF
)
1967 /* If this expression is getting a value from a PLACEHOLDER_EXPR
1968 and it is the right field, replace it with R. */
1969 for (inner
= TREE_OPERAND (exp
, 0);
1970 REFERENCE_CLASS_P (inner
);
1971 inner
= TREE_OPERAND (inner
, 0))
1973 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
1974 && TREE_OPERAND (exp
, 1) == f
)
1977 /* If this expression hasn't been completed let, leave it alone. */
1978 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
&& TREE_TYPE (inner
) == 0)
1981 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
1982 if (op0
== TREE_OPERAND (exp
, 0))
1985 new = fold (build3 (COMPONENT_REF
, TREE_TYPE (exp
),
1986 op0
, TREE_OPERAND (exp
, 1), NULL_TREE
));
1989 switch (TREE_CODE_CLASS (code
))
1992 case tcc_declaration
:
1995 case tcc_exceptional
:
1998 case tcc_comparison
:
1999 case tcc_expression
:
2001 switch (TREE_CODE_LENGTH (code
))
2007 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2008 if (op0
== TREE_OPERAND (exp
, 0))
2011 new = fold (build1 (code
, TREE_TYPE (exp
), op0
));
2015 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2016 op1
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 1), f
, r
);
2018 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
2021 new = fold (build2 (code
, TREE_TYPE (exp
), op0
, op1
));
2025 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
2026 op1
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 1), f
, r
);
2027 op2
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 2), f
, r
);
2029 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2030 && op2
== TREE_OPERAND (exp
, 2))
2033 new = fold (build3 (code
, TREE_TYPE (exp
), op0
, op1
, op2
));
2045 TREE_READONLY (new) = TREE_READONLY (exp
);
2049 /* Similar, but look for a PLACEHOLDER_EXPR in EXP and find a replacement
2050 for it within OBJ, a tree that is an object or a chain of references. */
2053 substitute_placeholder_in_expr (tree exp
, tree obj
)
2055 enum tree_code code
= TREE_CODE (exp
);
2056 tree op0
, op1
, op2
, op3
;
2058 /* If this is a PLACEHOLDER_EXPR, see if we find a corresponding type
2059 in the chain of OBJ. */
2060 if (code
== PLACEHOLDER_EXPR
)
2062 tree need_type
= TYPE_MAIN_VARIANT (TREE_TYPE (exp
));
2065 for (elt
= obj
; elt
!= 0;
2066 elt
= ((TREE_CODE (elt
) == COMPOUND_EXPR
2067 || TREE_CODE (elt
) == COND_EXPR
)
2068 ? TREE_OPERAND (elt
, 1)
2069 : (REFERENCE_CLASS_P (elt
)
2070 || UNARY_CLASS_P (elt
)
2071 || BINARY_CLASS_P (elt
)
2072 || EXPRESSION_CLASS_P (elt
))
2073 ? TREE_OPERAND (elt
, 0) : 0))
2074 if (TYPE_MAIN_VARIANT (TREE_TYPE (elt
)) == need_type
)
2077 for (elt
= obj
; elt
!= 0;
2078 elt
= ((TREE_CODE (elt
) == COMPOUND_EXPR
2079 || TREE_CODE (elt
) == COND_EXPR
)
2080 ? TREE_OPERAND (elt
, 1)
2081 : (REFERENCE_CLASS_P (elt
)
2082 || UNARY_CLASS_P (elt
)
2083 || BINARY_CLASS_P (elt
)
2084 || EXPRESSION_CLASS_P (elt
))
2085 ? TREE_OPERAND (elt
, 0) : 0))
2086 if (POINTER_TYPE_P (TREE_TYPE (elt
))
2087 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (elt
)))
2089 return fold (build1 (INDIRECT_REF
, need_type
, elt
));
2091 /* If we didn't find it, return the original PLACEHOLDER_EXPR. If it
2092 survives until RTL generation, there will be an error. */
2096 /* TREE_LIST is special because we need to look at TREE_VALUE
2097 and TREE_CHAIN, not TREE_OPERANDS. */
2098 else if (code
== TREE_LIST
)
2100 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp
), obj
);
2101 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp
), obj
);
2102 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
2105 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
2108 switch (TREE_CODE_CLASS (code
))
2111 case tcc_declaration
:
2114 case tcc_exceptional
:
2117 case tcc_comparison
:
2118 case tcc_expression
:
2121 switch (TREE_CODE_LENGTH (code
))
2127 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2128 if (op0
== TREE_OPERAND (exp
, 0))
2131 return fold (build1 (code
, TREE_TYPE (exp
), op0
));
2134 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2135 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2137 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
2140 return fold (build2 (code
, TREE_TYPE (exp
), op0
, op1
));
2143 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2144 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2145 op2
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 2), obj
);
2147 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2148 && op2
== TREE_OPERAND (exp
, 2))
2151 return fold (build3 (code
, TREE_TYPE (exp
), op0
, op1
, op2
));
2154 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
2155 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
2156 op2
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 2), obj
);
2157 op3
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 3), obj
);
2159 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2160 && op2
== TREE_OPERAND (exp
, 2)
2161 && op3
== TREE_OPERAND (exp
, 3))
2164 return fold (build4 (code
, TREE_TYPE (exp
), op0
, op1
, op2
, op3
));
2176 /* Stabilize a reference so that we can use it any number of times
2177 without causing its operands to be evaluated more than once.
2178 Returns the stabilized reference. This works by means of save_expr,
2179 so see the caveats in the comments about save_expr.
2181 Also allows conversion expressions whose operands are references.
2182 Any other kind of expression is returned unchanged. */
2185 stabilize_reference (tree ref
)
2188 enum tree_code code
= TREE_CODE (ref
);
2195 /* No action is needed in this case. */
2201 case FIX_TRUNC_EXPR
:
2202 case FIX_FLOOR_EXPR
:
2203 case FIX_ROUND_EXPR
:
2205 result
= build_nt (code
, stabilize_reference (TREE_OPERAND (ref
, 0)));
2209 result
= build_nt (INDIRECT_REF
,
2210 stabilize_reference_1 (TREE_OPERAND (ref
, 0)));
2214 result
= build_nt (COMPONENT_REF
,
2215 stabilize_reference (TREE_OPERAND (ref
, 0)),
2216 TREE_OPERAND (ref
, 1), NULL_TREE
);
2220 result
= build_nt (BIT_FIELD_REF
,
2221 stabilize_reference (TREE_OPERAND (ref
, 0)),
2222 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2223 stabilize_reference_1 (TREE_OPERAND (ref
, 2)));
2227 result
= build_nt (ARRAY_REF
,
2228 stabilize_reference (TREE_OPERAND (ref
, 0)),
2229 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2230 TREE_OPERAND (ref
, 2), TREE_OPERAND (ref
, 3));
2233 case ARRAY_RANGE_REF
:
2234 result
= build_nt (ARRAY_RANGE_REF
,
2235 stabilize_reference (TREE_OPERAND (ref
, 0)),
2236 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2237 TREE_OPERAND (ref
, 2), TREE_OPERAND (ref
, 3));
2241 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2242 it wouldn't be ignored. This matters when dealing with
2244 return stabilize_reference_1 (ref
);
2246 /* If arg isn't a kind of lvalue we recognize, make no change.
2247 Caller should recognize the error for an invalid lvalue. */
2252 return error_mark_node
;
2255 TREE_TYPE (result
) = TREE_TYPE (ref
);
2256 TREE_READONLY (result
) = TREE_READONLY (ref
);
2257 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (ref
);
2258 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (ref
);
2263 /* Subroutine of stabilize_reference; this is called for subtrees of
2264 references. Any expression with side-effects must be put in a SAVE_EXPR
2265 to ensure that it is only evaluated once.
2267 We don't put SAVE_EXPR nodes around everything, because assigning very
2268 simple expressions to temporaries causes us to miss good opportunities
2269 for optimizations. Among other things, the opportunity to fold in the
2270 addition of a constant into an addressing mode often gets lost, e.g.
2271 "y[i+1] += x;". In general, we take the approach that we should not make
2272 an assignment unless we are forced into it - i.e., that any non-side effect
2273 operator should be allowed, and that cse should take care of coalescing
2274 multiple utterances of the same expression should that prove fruitful. */
2277 stabilize_reference_1 (tree e
)
2280 enum tree_code code
= TREE_CODE (e
);
2282 /* We cannot ignore const expressions because it might be a reference
2283 to a const array but whose index contains side-effects. But we can
2284 ignore things that are actual constant or that already have been
2285 handled by this function. */
2287 if (TREE_INVARIANT (e
))
2290 switch (TREE_CODE_CLASS (code
))
2292 case tcc_exceptional
:
2294 case tcc_declaration
:
2295 case tcc_comparison
:
2297 case tcc_expression
:
2299 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2300 so that it will only be evaluated once. */
2301 /* The reference (r) and comparison (<) classes could be handled as
2302 below, but it is generally faster to only evaluate them once. */
2303 if (TREE_SIDE_EFFECTS (e
))
2304 return save_expr (e
);
2308 /* Constants need no processing. In fact, we should never reach
2313 /* Division is slow and tends to be compiled with jumps,
2314 especially the division by powers of 2 that is often
2315 found inside of an array reference. So do it just once. */
2316 if (code
== TRUNC_DIV_EXPR
|| code
== TRUNC_MOD_EXPR
2317 || code
== FLOOR_DIV_EXPR
|| code
== FLOOR_MOD_EXPR
2318 || code
== CEIL_DIV_EXPR
|| code
== CEIL_MOD_EXPR
2319 || code
== ROUND_DIV_EXPR
|| code
== ROUND_MOD_EXPR
)
2320 return save_expr (e
);
2321 /* Recursively stabilize each operand. */
2322 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)),
2323 stabilize_reference_1 (TREE_OPERAND (e
, 1)));
2327 /* Recursively stabilize each operand. */
2328 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)));
2335 TREE_TYPE (result
) = TREE_TYPE (e
);
2336 TREE_READONLY (result
) = TREE_READONLY (e
);
2337 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (e
);
2338 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (e
);
2339 TREE_INVARIANT (result
) = 1;
2344 /* Low-level constructors for expressions. */
2346 /* A helper function for build1 and constant folders. Set TREE_CONSTANT,
2347 TREE_INVARIANT, and TREE_SIDE_EFFECTS for an ADDR_EXPR. */
2350 recompute_tree_invarant_for_addr_expr (tree t
)
2353 bool tc
= true, ti
= true, se
= false;
2355 /* We started out assuming this address is both invariant and constant, but
2356 does not have side effects. Now go down any handled components and see if
2357 any of them involve offsets that are either non-constant or non-invariant.
2358 Also check for side-effects.
2360 ??? Note that this code makes no attempt to deal with the case where
2361 taking the address of something causes a copy due to misalignment. */
2363 #define UPDATE_TITCSE(NODE) \
2364 do { tree _node = (NODE); \
2365 if (_node && !TREE_INVARIANT (_node)) ti = false; \
2366 if (_node && !TREE_CONSTANT (_node)) tc = false; \
2367 if (_node && TREE_SIDE_EFFECTS (_node)) se = true; } while (0)
2369 for (node
= TREE_OPERAND (t
, 0); handled_component_p (node
);
2370 node
= TREE_OPERAND (node
, 0))
2372 /* If the first operand doesn't have an ARRAY_TYPE, this is a bogus
2373 array reference (probably made temporarily by the G++ front end),
2374 so ignore all the operands. */
2375 if ((TREE_CODE (node
) == ARRAY_REF
2376 || TREE_CODE (node
) == ARRAY_RANGE_REF
)
2377 && TREE_CODE (TREE_TYPE (TREE_OPERAND (node
, 0))) == ARRAY_TYPE
)
2379 UPDATE_TITCSE (TREE_OPERAND (node
, 1));
2380 if (TREE_OPERAND (node
, 2))
2381 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2382 if (TREE_OPERAND (node
, 3))
2383 UPDATE_TITCSE (TREE_OPERAND (node
, 3));
2385 /* Likewise, just because this is a COMPONENT_REF doesn't mean we have a
2386 FIELD_DECL, apparently. The G++ front end can put something else
2387 there, at least temporarily. */
2388 else if (TREE_CODE (node
) == COMPONENT_REF
2389 && TREE_CODE (TREE_OPERAND (node
, 1)) == FIELD_DECL
)
2391 if (TREE_OPERAND (node
, 2))
2392 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2394 else if (TREE_CODE (node
) == BIT_FIELD_REF
)
2395 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2398 /* Now see what's inside. If it's an INDIRECT_REF, copy our properties from
2399 the address, since &(*a)->b is a form of addition. If it's a decl, it's
2400 invariant and constant if the decl is static. It's also invariant if it's
2401 a decl in the current function. Taking the address of a volatile variable
2402 is not volatile. If it's a constant, the address is both invariant and
2403 constant. Otherwise it's neither. */
2404 if (TREE_CODE (node
) == INDIRECT_REF
)
2405 UPDATE_TITCSE (TREE_OPERAND (node
, 0));
2406 else if (DECL_P (node
))
2410 else if (decl_function_context (node
) == current_function_decl
2411 /* Addresses of thread-local variables are invariant. */
2412 || (TREE_CODE (node
) == VAR_DECL
&& DECL_THREAD_LOCAL (node
)))
2417 else if (CONSTANT_CLASS_P (node
))
2422 se
|= TREE_SIDE_EFFECTS (node
);
2425 TREE_CONSTANT (t
) = tc
;
2426 TREE_INVARIANT (t
) = ti
;
2427 TREE_SIDE_EFFECTS (t
) = se
;
2428 #undef UPDATE_TITCSE
2431 /* Build an expression of code CODE, data type TYPE, and operands as
2432 specified. Expressions and reference nodes can be created this way.
2433 Constants, decls, types and misc nodes cannot be.
2435 We define 5 non-variadic functions, from 0 to 4 arguments. This is
2436 enough for all extant tree codes. These functions can be called
2437 directly (preferably!), but can also be obtained via GCC preprocessor
2438 magic within the build macro. */
2441 build0_stat (enum tree_code code
, tree tt MEM_STAT_DECL
)
2445 gcc_assert (TREE_CODE_LENGTH (code
) == 0);
2447 t
= make_node_stat (code PASS_MEM_STAT
);
2454 build1_stat (enum tree_code code
, tree type
, tree node MEM_STAT_DECL
)
2456 int length
= sizeof (struct tree_exp
);
2457 #ifdef GATHER_STATISTICS
2458 tree_node_kind kind
;
2462 #ifdef GATHER_STATISTICS
2463 switch (TREE_CODE_CLASS (code
))
2465 case tcc_statement
: /* an expression with side effects */
2468 case tcc_reference
: /* a reference */
2476 tree_node_counts
[(int) kind
]++;
2477 tree_node_sizes
[(int) kind
] += length
;
2480 gcc_assert (TREE_CODE_LENGTH (code
) == 1);
2482 t
= ggc_alloc_zone_stat (length
, tree_zone PASS_MEM_STAT
);
2484 memset (t
, 0, sizeof (struct tree_common
));
2486 TREE_SET_CODE (t
, code
);
2488 TREE_TYPE (t
) = type
;
2489 #ifdef USE_MAPPED_LOCATION
2490 SET_EXPR_LOCATION (t
, UNKNOWN_LOCATION
);
2492 SET_EXPR_LOCUS (t
, NULL
);
2494 TREE_COMPLEXITY (t
) = 0;
2495 TREE_OPERAND (t
, 0) = node
;
2496 TREE_BLOCK (t
) = NULL_TREE
;
2497 if (node
&& !TYPE_P (node
))
2499 TREE_SIDE_EFFECTS (t
) = TREE_SIDE_EFFECTS (node
);
2500 TREE_READONLY (t
) = TREE_READONLY (node
);
2503 if (TREE_CODE_CLASS (code
) == tcc_statement
)
2504 TREE_SIDE_EFFECTS (t
) = 1;
2510 case PREDECREMENT_EXPR
:
2511 case PREINCREMENT_EXPR
:
2512 case POSTDECREMENT_EXPR
:
2513 case POSTINCREMENT_EXPR
:
2514 /* All of these have side-effects, no matter what their
2516 TREE_SIDE_EFFECTS (t
) = 1;
2517 TREE_READONLY (t
) = 0;
2520 case MISALIGNED_INDIRECT_REF
:
2521 case ALIGN_INDIRECT_REF
:
2523 /* Whether a dereference is readonly has nothing to do with whether
2524 its operand is readonly. */
2525 TREE_READONLY (t
) = 0;
2530 recompute_tree_invarant_for_addr_expr (t
);
2534 if (TREE_CODE_CLASS (code
) == tcc_unary
2535 && node
&& !TYPE_P (node
)
2536 && TREE_CONSTANT (node
))
2537 TREE_CONSTANT (t
) = 1;
2538 if (TREE_CODE_CLASS (code
) == tcc_unary
2539 && node
&& TREE_INVARIANT (node
))
2540 TREE_INVARIANT (t
) = 1;
2541 if (TREE_CODE_CLASS (code
) == tcc_reference
2542 && node
&& TREE_THIS_VOLATILE (node
))
2543 TREE_THIS_VOLATILE (t
) = 1;
2550 #define PROCESS_ARG(N) \
2552 TREE_OPERAND (t, N) = arg##N; \
2553 if (arg##N &&!TYPE_P (arg##N)) \
2555 if (TREE_SIDE_EFFECTS (arg##N)) \
2557 if (!TREE_READONLY (arg##N)) \
2559 if (!TREE_CONSTANT (arg##N)) \
2561 if (!TREE_INVARIANT (arg##N)) \
2567 build2_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1 MEM_STAT_DECL
)
2569 bool constant
, read_only
, side_effects
, invariant
;
2572 gcc_assert (TREE_CODE_LENGTH (code
) == 2);
2574 t
= make_node_stat (code PASS_MEM_STAT
);
2577 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
2578 result based on those same flags for the arguments. But if the
2579 arguments aren't really even `tree' expressions, we shouldn't be trying
2582 /* Expressions without side effects may be constant if their
2583 arguments are as well. */
2584 constant
= (TREE_CODE_CLASS (code
) == tcc_comparison
2585 || TREE_CODE_CLASS (code
) == tcc_binary
);
2587 side_effects
= TREE_SIDE_EFFECTS (t
);
2588 invariant
= constant
;
2593 TREE_READONLY (t
) = read_only
;
2594 TREE_CONSTANT (t
) = constant
;
2595 TREE_INVARIANT (t
) = invariant
;
2596 TREE_SIDE_EFFECTS (t
) = side_effects
;
2597 TREE_THIS_VOLATILE (t
)
2598 = (TREE_CODE_CLASS (code
) == tcc_reference
2599 && arg0
&& TREE_THIS_VOLATILE (arg0
));
2605 build3_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
2606 tree arg2 MEM_STAT_DECL
)
2608 bool constant
, read_only
, side_effects
, invariant
;
2611 gcc_assert (TREE_CODE_LENGTH (code
) == 3);
2613 t
= make_node_stat (code PASS_MEM_STAT
);
2616 side_effects
= TREE_SIDE_EFFECTS (t
);
2622 if (code
== CALL_EXPR
&& !side_effects
)
2627 /* Calls have side-effects, except those to const or
2629 i
= call_expr_flags (t
);
2630 if (!(i
& (ECF_CONST
| ECF_PURE
)))
2633 /* And even those have side-effects if their arguments do. */
2634 else for (node
= arg1
; node
; node
= TREE_CHAIN (node
))
2635 if (TREE_SIDE_EFFECTS (TREE_VALUE (node
)))
2642 TREE_SIDE_EFFECTS (t
) = side_effects
;
2643 TREE_THIS_VOLATILE (t
)
2644 = (TREE_CODE_CLASS (code
) == tcc_reference
2645 && arg0
&& TREE_THIS_VOLATILE (arg0
));
2651 build4_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
2652 tree arg2
, tree arg3 MEM_STAT_DECL
)
2654 bool constant
, read_only
, side_effects
, invariant
;
2657 gcc_assert (TREE_CODE_LENGTH (code
) == 4);
2659 t
= make_node_stat (code PASS_MEM_STAT
);
2662 side_effects
= TREE_SIDE_EFFECTS (t
);
2669 TREE_SIDE_EFFECTS (t
) = side_effects
;
2670 TREE_THIS_VOLATILE (t
)
2671 = (TREE_CODE_CLASS (code
) == tcc_reference
2672 && arg0
&& TREE_THIS_VOLATILE (arg0
));
2677 /* Backup definition for non-gcc build compilers. */
2680 (build
) (enum tree_code code
, tree tt
, ...)
2682 tree t
, arg0
, arg1
, arg2
, arg3
;
2683 int length
= TREE_CODE_LENGTH (code
);
2690 t
= build0 (code
, tt
);
2693 arg0
= va_arg (p
, tree
);
2694 t
= build1 (code
, tt
, arg0
);
2697 arg0
= va_arg (p
, tree
);
2698 arg1
= va_arg (p
, tree
);
2699 t
= build2 (code
, tt
, arg0
, arg1
);
2702 arg0
= va_arg (p
, tree
);
2703 arg1
= va_arg (p
, tree
);
2704 arg2
= va_arg (p
, tree
);
2705 t
= build3 (code
, tt
, arg0
, arg1
, arg2
);
2708 arg0
= va_arg (p
, tree
);
2709 arg1
= va_arg (p
, tree
);
2710 arg2
= va_arg (p
, tree
);
2711 arg3
= va_arg (p
, tree
);
2712 t
= build4 (code
, tt
, arg0
, arg1
, arg2
, arg3
);
2722 /* Similar except don't specify the TREE_TYPE
2723 and leave the TREE_SIDE_EFFECTS as 0.
2724 It is permissible for arguments to be null,
2725 or even garbage if their values do not matter. */
2728 build_nt (enum tree_code code
, ...)
2737 t
= make_node (code
);
2738 length
= TREE_CODE_LENGTH (code
);
2740 for (i
= 0; i
< length
; i
++)
2741 TREE_OPERAND (t
, i
) = va_arg (p
, tree
);
2747 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
2748 We do NOT enter this node in any sort of symbol table.
2750 layout_decl is used to set up the decl's storage layout.
2751 Other slots are initialized to 0 or null pointers. */
2754 build_decl_stat (enum tree_code code
, tree name
, tree type MEM_STAT_DECL
)
2758 t
= make_node_stat (code PASS_MEM_STAT
);
2760 /* if (type == error_mark_node)
2761 type = integer_type_node; */
2762 /* That is not done, deliberately, so that having error_mark_node
2763 as the type can suppress useless errors in the use of this variable. */
2765 DECL_NAME (t
) = name
;
2766 TREE_TYPE (t
) = type
;
2768 if (code
== VAR_DECL
|| code
== PARM_DECL
|| code
== RESULT_DECL
)
2770 else if (code
== FUNCTION_DECL
)
2771 DECL_MODE (t
) = FUNCTION_MODE
;
2773 /* Set default visibility to whatever the user supplied with
2774 visibility_specified depending on #pragma GCC visibility. */
2775 DECL_VISIBILITY (t
) = default_visibility
;
2776 DECL_VISIBILITY_SPECIFIED (t
) = visibility_options
.inpragma
;
2781 /* BLOCK nodes are used to represent the structure of binding contours
2782 and declarations, once those contours have been exited and their contents
2783 compiled. This information is used for outputting debugging info. */
2786 build_block (tree vars
, tree tags ATTRIBUTE_UNUSED
, tree subblocks
,
2787 tree supercontext
, tree chain
)
2789 tree block
= make_node (BLOCK
);
2791 BLOCK_VARS (block
) = vars
;
2792 BLOCK_SUBBLOCKS (block
) = subblocks
;
2793 BLOCK_SUPERCONTEXT (block
) = supercontext
;
2794 BLOCK_CHAIN (block
) = chain
;
2798 #if 1 /* ! defined(USE_MAPPED_LOCATION) */
2799 /* ??? gengtype doesn't handle conditionals */
2800 static GTY(()) tree last_annotated_node
;
2803 #ifdef USE_MAPPED_LOCATION
2806 expand_location (source_location loc
)
2808 expanded_location xloc
;
2809 if (loc
== 0) { xloc
.file
= NULL
; xloc
.line
= 0; xloc
.column
= 0; }
2812 const struct line_map
*map
= linemap_lookup (&line_table
, loc
);
2813 xloc
.file
= map
->to_file
;
2814 xloc
.line
= SOURCE_LINE (map
, loc
);
2815 xloc
.column
= SOURCE_COLUMN (map
, loc
);
2822 /* Record the exact location where an expression or an identifier were
2826 annotate_with_file_line (tree node
, const char *file
, int line
)
2828 /* Roughly one percent of the calls to this function are to annotate
2829 a node with the same information already attached to that node!
2830 Just return instead of wasting memory. */
2831 if (EXPR_LOCUS (node
)
2832 && (EXPR_FILENAME (node
) == file
2833 || ! strcmp (EXPR_FILENAME (node
), file
))
2834 && EXPR_LINENO (node
) == line
)
2836 last_annotated_node
= node
;
2840 /* In heavily macroized code (such as GCC itself) this single
2841 entry cache can reduce the number of allocations by more
2843 if (last_annotated_node
2844 && EXPR_LOCUS (last_annotated_node
)
2845 && (EXPR_FILENAME (last_annotated_node
) == file
2846 || ! strcmp (EXPR_FILENAME (last_annotated_node
), file
))
2847 && EXPR_LINENO (last_annotated_node
) == line
)
2849 SET_EXPR_LOCUS (node
, EXPR_LOCUS (last_annotated_node
));
2853 SET_EXPR_LOCUS (node
, ggc_alloc (sizeof (location_t
)));
2854 EXPR_LINENO (node
) = line
;
2855 EXPR_FILENAME (node
) = file
;
2856 last_annotated_node
= node
;
2860 annotate_with_locus (tree node
, location_t locus
)
2862 annotate_with_file_line (node
, locus
.file
, locus
.line
);
2866 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
2870 build_decl_attribute_variant (tree ddecl
, tree attribute
)
2872 DECL_ATTRIBUTES (ddecl
) = attribute
;
2876 /* Borrowed from hashtab.c iterative_hash implementation. */
2877 #define mix(a,b,c) \
2879 a -= b; a -= c; a ^= (c>>13); \
2880 b -= c; b -= a; b ^= (a<< 8); \
2881 c -= a; c -= b; c ^= ((b&0xffffffff)>>13); \
2882 a -= b; a -= c; a ^= ((c&0xffffffff)>>12); \
2883 b -= c; b -= a; b = (b ^ (a<<16)) & 0xffffffff; \
2884 c -= a; c -= b; c = (c ^ (b>> 5)) & 0xffffffff; \
2885 a -= b; a -= c; a = (a ^ (c>> 3)) & 0xffffffff; \
2886 b -= c; b -= a; b = (b ^ (a<<10)) & 0xffffffff; \
2887 c -= a; c -= b; c = (c ^ (b>>15)) & 0xffffffff; \
2891 /* Produce good hash value combining VAL and VAL2. */
2892 static inline hashval_t
2893 iterative_hash_hashval_t (hashval_t val
, hashval_t val2
)
2895 /* the golden ratio; an arbitrary value. */
2896 hashval_t a
= 0x9e3779b9;
2902 /* Produce good hash value combining PTR and VAL2. */
2903 static inline hashval_t
2904 iterative_hash_pointer (void *ptr
, hashval_t val2
)
2906 if (sizeof (ptr
) == sizeof (hashval_t
))
2907 return iterative_hash_hashval_t ((size_t) ptr
, val2
);
2910 hashval_t a
= (hashval_t
) (size_t) ptr
;
2911 /* Avoid warnings about shifting of more than the width of the type on
2912 hosts that won't execute this path. */
2914 hashval_t b
= (hashval_t
) ((size_t) ptr
>> (sizeof (hashval_t
) * 8 + zero
));
2920 /* Produce good hash value combining VAL and VAL2. */
2921 static inline hashval_t
2922 iterative_hash_host_wide_int (HOST_WIDE_INT val
, hashval_t val2
)
2924 if (sizeof (HOST_WIDE_INT
) == sizeof (hashval_t
))
2925 return iterative_hash_hashval_t (val
, val2
);
2928 hashval_t a
= (hashval_t
) val
;
2929 /* Avoid warnings about shifting of more than the width of the type on
2930 hosts that won't execute this path. */
2932 hashval_t b
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 8 + zero
));
2934 if (sizeof (HOST_WIDE_INT
) > 2 * sizeof (hashval_t
))
2936 hashval_t a
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 16 + zero
));
2937 hashval_t b
= (hashval_t
) (val
>> (sizeof (hashval_t
) * 24 + zero
));
2944 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
2947 Record such modified types already made so we don't make duplicates. */
2950 build_type_attribute_variant (tree ttype
, tree attribute
)
2952 if (! attribute_list_equal (TYPE_ATTRIBUTES (ttype
), attribute
))
2954 hashval_t hashcode
= 0;
2956 enum tree_code code
= TREE_CODE (ttype
);
2958 ntype
= copy_node (ttype
);
2960 TYPE_POINTER_TO (ntype
) = 0;
2961 TYPE_REFERENCE_TO (ntype
) = 0;
2962 TYPE_ATTRIBUTES (ntype
) = attribute
;
2964 /* Create a new main variant of TYPE. */
2965 TYPE_MAIN_VARIANT (ntype
) = ntype
;
2966 TYPE_NEXT_VARIANT (ntype
) = 0;
2967 set_type_quals (ntype
, TYPE_UNQUALIFIED
);
2969 hashcode
= iterative_hash_object (code
, hashcode
);
2970 if (TREE_TYPE (ntype
))
2971 hashcode
= iterative_hash_object (TYPE_HASH (TREE_TYPE (ntype
)),
2973 hashcode
= attribute_hash_list (attribute
, hashcode
);
2975 switch (TREE_CODE (ntype
))
2978 hashcode
= type_hash_list (TYPE_ARG_TYPES (ntype
), hashcode
);
2981 hashcode
= iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (ntype
)),
2985 hashcode
= iterative_hash_object
2986 (TREE_INT_CST_LOW (TYPE_MAX_VALUE (ntype
)), hashcode
);
2987 hashcode
= iterative_hash_object
2988 (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (ntype
)), hashcode
);
2992 unsigned int precision
= TYPE_PRECISION (ntype
);
2993 hashcode
= iterative_hash_object (precision
, hashcode
);
3000 ntype
= type_hash_canon (hashcode
, ntype
);
3001 ttype
= build_qualified_type (ntype
, TYPE_QUALS (ttype
));
3008 /* Return nonzero if IDENT is a valid name for attribute ATTR,
3011 We try both `text' and `__text__', ATTR may be either one. */
3012 /* ??? It might be a reasonable simplification to require ATTR to be only
3013 `text'. One might then also require attribute lists to be stored in
3014 their canonicalized form. */
3017 is_attribute_with_length_p (const char *attr
, int attr_len
, tree ident
)
3022 if (TREE_CODE (ident
) != IDENTIFIER_NODE
)
3025 p
= IDENTIFIER_POINTER (ident
);
3026 ident_len
= IDENTIFIER_LENGTH (ident
);
3028 if (ident_len
== attr_len
3029 && strcmp (attr
, p
) == 0)
3032 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
3035 gcc_assert (attr
[1] == '_');
3036 gcc_assert (attr
[attr_len
- 2] == '_');
3037 gcc_assert (attr
[attr_len
- 1] == '_');
3038 gcc_assert (attr
[1] == '_');
3039 if (ident_len
== attr_len
- 4
3040 && strncmp (attr
+ 2, p
, attr_len
- 4) == 0)
3045 if (ident_len
== attr_len
+ 4
3046 && p
[0] == '_' && p
[1] == '_'
3047 && p
[ident_len
- 2] == '_' && p
[ident_len
- 1] == '_'
3048 && strncmp (attr
, p
+ 2, attr_len
) == 0)
3055 /* Return nonzero if IDENT is a valid name for attribute ATTR,
3058 We try both `text' and `__text__', ATTR may be either one. */
3061 is_attribute_p (const char *attr
, tree ident
)
3063 return is_attribute_with_length_p (attr
, strlen (attr
), ident
);
3066 /* Given an attribute name and a list of attributes, return a pointer to the
3067 attribute's list element if the attribute is part of the list, or NULL_TREE
3068 if not found. If the attribute appears more than once, this only
3069 returns the first occurrence; the TREE_CHAIN of the return value should
3070 be passed back in if further occurrences are wanted. */
3073 lookup_attribute (const char *attr_name
, tree list
)
3076 size_t attr_len
= strlen (attr_name
);
3078 for (l
= list
; l
; l
= TREE_CHAIN (l
))
3080 gcc_assert (TREE_CODE (TREE_PURPOSE (l
)) == IDENTIFIER_NODE
);
3081 if (is_attribute_with_length_p (attr_name
, attr_len
, TREE_PURPOSE (l
)))
3088 /* Return an attribute list that is the union of a1 and a2. */
3091 merge_attributes (tree a1
, tree a2
)
3095 /* Either one unset? Take the set one. */
3097 if ((attributes
= a1
) == 0)
3100 /* One that completely contains the other? Take it. */
3102 else if (a2
!= 0 && ! attribute_list_contained (a1
, a2
))
3104 if (attribute_list_contained (a2
, a1
))
3108 /* Pick the longest list, and hang on the other list. */
3110 if (list_length (a1
) < list_length (a2
))
3111 attributes
= a2
, a2
= a1
;
3113 for (; a2
!= 0; a2
= TREE_CHAIN (a2
))
3116 for (a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
3119 a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
3122 if (simple_cst_equal (TREE_VALUE (a
), TREE_VALUE (a2
)) == 1)
3127 a1
= copy_node (a2
);
3128 TREE_CHAIN (a1
) = attributes
;
3137 /* Given types T1 and T2, merge their attributes and return
3141 merge_type_attributes (tree t1
, tree t2
)
3143 return merge_attributes (TYPE_ATTRIBUTES (t1
),
3144 TYPE_ATTRIBUTES (t2
));
3147 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
3151 merge_decl_attributes (tree olddecl
, tree newdecl
)
3153 return merge_attributes (DECL_ATTRIBUTES (olddecl
),
3154 DECL_ATTRIBUTES (newdecl
));
3157 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
3159 /* Specialization of merge_decl_attributes for various Windows targets.
3161 This handles the following situation:
3163 __declspec (dllimport) int foo;
3166 The second instance of `foo' nullifies the dllimport. */
3169 merge_dllimport_decl_attributes (tree old
, tree
new)
3172 int delete_dllimport_p
;
3174 old
= DECL_ATTRIBUTES (old
);
3175 new = DECL_ATTRIBUTES (new);
3177 /* What we need to do here is remove from `old' dllimport if it doesn't
3178 appear in `new'. dllimport behaves like extern: if a declaration is
3179 marked dllimport and a definition appears later, then the object
3180 is not dllimport'd. */
3181 if (lookup_attribute ("dllimport", old
) != NULL_TREE
3182 && lookup_attribute ("dllimport", new) == NULL_TREE
)
3183 delete_dllimport_p
= 1;
3185 delete_dllimport_p
= 0;
3187 a
= merge_attributes (old
, new);
3189 if (delete_dllimport_p
)
3193 /* Scan the list for dllimport and delete it. */
3194 for (prev
= NULL_TREE
, t
= a
; t
; prev
= t
, t
= TREE_CHAIN (t
))
3196 if (is_attribute_p ("dllimport", TREE_PURPOSE (t
)))
3198 if (prev
== NULL_TREE
)
3201 TREE_CHAIN (prev
) = TREE_CHAIN (t
);
3210 /* Handle a "dllimport" or "dllexport" attribute; arguments as in
3211 struct attribute_spec.handler. */
3214 handle_dll_attribute (tree
* pnode
, tree name
, tree args
, int flags
,
3219 /* These attributes may apply to structure and union types being created,
3220 but otherwise should pass to the declaration involved. */
3223 if (flags
& ((int) ATTR_FLAG_DECL_NEXT
| (int) ATTR_FLAG_FUNCTION_NEXT
3224 | (int) ATTR_FLAG_ARRAY_NEXT
))
3226 *no_add_attrs
= true;
3227 return tree_cons (name
, args
, NULL_TREE
);
3229 if (TREE_CODE (node
) != RECORD_TYPE
&& TREE_CODE (node
) != UNION_TYPE
)
3231 warning ("%qs attribute ignored", IDENTIFIER_POINTER (name
));
3232 *no_add_attrs
= true;
3238 /* Report error on dllimport ambiguities seen now before they cause
3240 if (is_attribute_p ("dllimport", name
))
3242 /* Like MS, treat definition of dllimported variables and
3243 non-inlined functions on declaration as syntax errors. We
3244 allow the attribute for function definitions if declared
3246 if (TREE_CODE (node
) == FUNCTION_DECL
&& DECL_INITIAL (node
)
3247 && !DECL_DECLARED_INLINE_P (node
))
3249 error ("%Jfunction %qD definition is marked dllimport.", node
, node
);
3250 *no_add_attrs
= true;
3253 else if (TREE_CODE (node
) == VAR_DECL
)
3255 if (DECL_INITIAL (node
))
3257 error ("%Jvariable %qD definition is marked dllimport.",
3259 *no_add_attrs
= true;
3262 /* `extern' needn't be specified with dllimport.
3263 Specify `extern' now and hope for the best. Sigh. */
3264 DECL_EXTERNAL (node
) = 1;
3265 /* Also, implicitly give dllimport'd variables declared within
3266 a function global scope, unless declared static. */
3267 if (current_function_decl
!= NULL_TREE
&& !TREE_STATIC (node
))
3268 TREE_PUBLIC (node
) = 1;
3272 /* Report error if symbol is not accessible at global scope. */
3273 if (!TREE_PUBLIC (node
)
3274 && (TREE_CODE (node
) == VAR_DECL
3275 || TREE_CODE (node
) == FUNCTION_DECL
))
3277 error ("%Jexternal linkage required for symbol %qD because of "
3278 "%qs attribute.", node
, node
, IDENTIFIER_POINTER (name
));
3279 *no_add_attrs
= true;
3285 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
3287 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
3288 of the various TYPE_QUAL values. */
3291 set_type_quals (tree type
, int type_quals
)
3293 TYPE_READONLY (type
) = (type_quals
& TYPE_QUAL_CONST
) != 0;
3294 TYPE_VOLATILE (type
) = (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
3295 TYPE_RESTRICT (type
) = (type_quals
& TYPE_QUAL_RESTRICT
) != 0;
3298 /* Returns true iff cand is equivalent to base with type_quals. */
3301 check_qualified_type (tree cand
, tree base
, int type_quals
)
3303 return (TYPE_QUALS (cand
) == type_quals
3304 && TYPE_NAME (cand
) == TYPE_NAME (base
)
3305 /* Apparently this is needed for Objective-C. */
3306 && TYPE_CONTEXT (cand
) == TYPE_CONTEXT (base
)
3307 && attribute_list_equal (TYPE_ATTRIBUTES (cand
),
3308 TYPE_ATTRIBUTES (base
)));
3311 /* Return a version of the TYPE, qualified as indicated by the
3312 TYPE_QUALS, if one exists. If no qualified version exists yet,
3313 return NULL_TREE. */
3316 get_qualified_type (tree type
, int type_quals
)
3320 if (TYPE_QUALS (type
) == type_quals
)
3323 /* Search the chain of variants to see if there is already one there just
3324 like the one we need to have. If so, use that existing one. We must
3325 preserve the TYPE_NAME, since there is code that depends on this. */
3326 for (t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
3327 if (check_qualified_type (t
, type
, type_quals
))
3333 /* Like get_qualified_type, but creates the type if it does not
3334 exist. This function never returns NULL_TREE. */
3337 build_qualified_type (tree type
, int type_quals
)
3341 /* See if we already have the appropriate qualified variant. */
3342 t
= get_qualified_type (type
, type_quals
);
3344 /* If not, build it. */
3347 t
= build_variant_type_copy (type
);
3348 set_type_quals (t
, type_quals
);
3354 /* Create a new distinct copy of TYPE. The new type is made its own
3358 build_distinct_type_copy (tree type
)
3360 tree t
= copy_node (type
);
3362 TYPE_POINTER_TO (t
) = 0;
3363 TYPE_REFERENCE_TO (t
) = 0;
3365 /* Make it its own variant. */
3366 TYPE_MAIN_VARIANT (t
) = t
;
3367 TYPE_NEXT_VARIANT (t
) = 0;
3372 /* Create a new variant of TYPE, equivalent but distinct.
3373 This is so the caller can modify it. */
3376 build_variant_type_copy (tree type
)
3378 tree t
, m
= TYPE_MAIN_VARIANT (type
);
3380 t
= build_distinct_type_copy (type
);
3382 /* Add the new type to the chain of variants of TYPE. */
3383 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (m
);
3384 TYPE_NEXT_VARIANT (m
) = t
;
3385 TYPE_MAIN_VARIANT (t
) = m
;
3390 /* Hashing of types so that we don't make duplicates.
3391 The entry point is `type_hash_canon'. */
3393 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
3394 with types in the TREE_VALUE slots), by adding the hash codes
3395 of the individual types. */
3398 type_hash_list (tree list
, hashval_t hashcode
)
3402 for (tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3403 if (TREE_VALUE (tail
) != error_mark_node
)
3404 hashcode
= iterative_hash_object (TYPE_HASH (TREE_VALUE (tail
)),
3410 /* These are the Hashtable callback functions. */
3412 /* Returns true iff the types are equivalent. */
3415 type_hash_eq (const void *va
, const void *vb
)
3417 const struct type_hash
*a
= va
, *b
= vb
;
3419 /* First test the things that are the same for all types. */
3420 if (a
->hash
!= b
->hash
3421 || TREE_CODE (a
->type
) != TREE_CODE (b
->type
)
3422 || TREE_TYPE (a
->type
) != TREE_TYPE (b
->type
)
3423 || !attribute_list_equal (TYPE_ATTRIBUTES (a
->type
),
3424 TYPE_ATTRIBUTES (b
->type
))
3425 || TYPE_ALIGN (a
->type
) != TYPE_ALIGN (b
->type
)
3426 || TYPE_MODE (a
->type
) != TYPE_MODE (b
->type
))
3429 switch (TREE_CODE (a
->type
))
3434 case REFERENCE_TYPE
:
3438 return TYPE_VECTOR_SUBPARTS (a
->type
) == TYPE_VECTOR_SUBPARTS (b
->type
);
3441 if (TYPE_VALUES (a
->type
) != TYPE_VALUES (b
->type
)
3442 && !(TYPE_VALUES (a
->type
)
3443 && TREE_CODE (TYPE_VALUES (a
->type
)) == TREE_LIST
3444 && TYPE_VALUES (b
->type
)
3445 && TREE_CODE (TYPE_VALUES (b
->type
)) == TREE_LIST
3446 && type_list_equal (TYPE_VALUES (a
->type
),
3447 TYPE_VALUES (b
->type
))))
3450 /* ... fall through ... */
3456 return ((TYPE_MAX_VALUE (a
->type
) == TYPE_MAX_VALUE (b
->type
)
3457 || tree_int_cst_equal (TYPE_MAX_VALUE (a
->type
),
3458 TYPE_MAX_VALUE (b
->type
)))
3459 && (TYPE_MIN_VALUE (a
->type
) == TYPE_MIN_VALUE (b
->type
)
3460 || tree_int_cst_equal (TYPE_MIN_VALUE (a
->type
),
3461 TYPE_MIN_VALUE (b
->type
))));
3464 return TYPE_OFFSET_BASETYPE (a
->type
) == TYPE_OFFSET_BASETYPE (b
->type
);
3467 return (TYPE_METHOD_BASETYPE (a
->type
) == TYPE_METHOD_BASETYPE (b
->type
)
3468 && (TYPE_ARG_TYPES (a
->type
) == TYPE_ARG_TYPES (b
->type
)
3469 || (TYPE_ARG_TYPES (a
->type
)
3470 && TREE_CODE (TYPE_ARG_TYPES (a
->type
)) == TREE_LIST
3471 && TYPE_ARG_TYPES (b
->type
)
3472 && TREE_CODE (TYPE_ARG_TYPES (b
->type
)) == TREE_LIST
3473 && type_list_equal (TYPE_ARG_TYPES (a
->type
),
3474 TYPE_ARG_TYPES (b
->type
)))));
3477 return TYPE_DOMAIN (a
->type
) == TYPE_DOMAIN (b
->type
);
3481 case QUAL_UNION_TYPE
:
3482 return (TYPE_FIELDS (a
->type
) == TYPE_FIELDS (b
->type
)
3483 || (TYPE_FIELDS (a
->type
)
3484 && TREE_CODE (TYPE_FIELDS (a
->type
)) == TREE_LIST
3485 && TYPE_FIELDS (b
->type
)
3486 && TREE_CODE (TYPE_FIELDS (b
->type
)) == TREE_LIST
3487 && type_list_equal (TYPE_FIELDS (a
->type
),
3488 TYPE_FIELDS (b
->type
))));
3491 return (TYPE_ARG_TYPES (a
->type
) == TYPE_ARG_TYPES (b
->type
)
3492 || (TYPE_ARG_TYPES (a
->type
)
3493 && TREE_CODE (TYPE_ARG_TYPES (a
->type
)) == TREE_LIST
3494 && TYPE_ARG_TYPES (b
->type
)
3495 && TREE_CODE (TYPE_ARG_TYPES (b
->type
)) == TREE_LIST
3496 && type_list_equal (TYPE_ARG_TYPES (a
->type
),
3497 TYPE_ARG_TYPES (b
->type
))));
3504 /* Return the cached hash value. */
3507 type_hash_hash (const void *item
)
3509 return ((const struct type_hash
*) item
)->hash
;
3512 /* Look in the type hash table for a type isomorphic to TYPE.
3513 If one is found, return it. Otherwise return 0. */
3516 type_hash_lookup (hashval_t hashcode
, tree type
)
3518 struct type_hash
*h
, in
;
3520 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
3521 must call that routine before comparing TYPE_ALIGNs. */
3527 h
= htab_find_with_hash (type_hash_table
, &in
, hashcode
);
3533 /* Add an entry to the type-hash-table
3534 for a type TYPE whose hash code is HASHCODE. */
3537 type_hash_add (hashval_t hashcode
, tree type
)
3539 struct type_hash
*h
;
3542 h
= ggc_alloc (sizeof (struct type_hash
));
3545 loc
= htab_find_slot_with_hash (type_hash_table
, h
, hashcode
, INSERT
);
3546 *(struct type_hash
**) loc
= h
;
3549 /* Given TYPE, and HASHCODE its hash code, return the canonical
3550 object for an identical type if one already exists.
3551 Otherwise, return TYPE, and record it as the canonical object.
3553 To use this function, first create a type of the sort you want.
3554 Then compute its hash code from the fields of the type that
3555 make it different from other similar types.
3556 Then call this function and use the value. */
3559 type_hash_canon (unsigned int hashcode
, tree type
)
3563 /* The hash table only contains main variants, so ensure that's what we're
3565 gcc_assert (TYPE_MAIN_VARIANT (type
) == type
);
3567 if (!lang_hooks
.types
.hash_types
)
3570 /* See if the type is in the hash table already. If so, return it.
3571 Otherwise, add the type. */
3572 t1
= type_hash_lookup (hashcode
, type
);
3575 #ifdef GATHER_STATISTICS
3576 tree_node_counts
[(int) t_kind
]--;
3577 tree_node_sizes
[(int) t_kind
] -= sizeof (struct tree_type
);
3583 type_hash_add (hashcode
, type
);
3588 /* See if the data pointed to by the type hash table is marked. We consider
3589 it marked if the type is marked or if a debug type number or symbol
3590 table entry has been made for the type. This reduces the amount of
3591 debugging output and eliminates that dependency of the debug output on
3592 the number of garbage collections. */
3595 type_hash_marked_p (const void *p
)
3597 tree type
= ((struct type_hash
*) p
)->type
;
3599 return ggc_marked_p (type
) || TYPE_SYMTAB_POINTER (type
);
3603 print_type_hash_statistics (void)
3605 fprintf (stderr
, "Type hash: size %ld, %ld elements, %f collisions\n",
3606 (long) htab_size (type_hash_table
),
3607 (long) htab_elements (type_hash_table
),
3608 htab_collisions (type_hash_table
));
3611 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
3612 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
3613 by adding the hash codes of the individual attributes. */
3616 attribute_hash_list (tree list
, hashval_t hashcode
)
3620 for (tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3621 /* ??? Do we want to add in TREE_VALUE too? */
3622 hashcode
= iterative_hash_object
3623 (IDENTIFIER_HASH_VALUE (TREE_PURPOSE (tail
)), hashcode
);
3627 /* Given two lists of attributes, return true if list l2 is
3628 equivalent to l1. */
3631 attribute_list_equal (tree l1
, tree l2
)
3633 return attribute_list_contained (l1
, l2
)
3634 && attribute_list_contained (l2
, l1
);
3637 /* Given two lists of attributes, return true if list L2 is
3638 completely contained within L1. */
3639 /* ??? This would be faster if attribute names were stored in a canonicalized
3640 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
3641 must be used to show these elements are equivalent (which they are). */
3642 /* ??? It's not clear that attributes with arguments will always be handled
3646 attribute_list_contained (tree l1
, tree l2
)
3650 /* First check the obvious, maybe the lists are identical. */
3654 /* Maybe the lists are similar. */
3655 for (t1
= l1
, t2
= l2
;
3657 && TREE_PURPOSE (t1
) == TREE_PURPOSE (t2
)
3658 && TREE_VALUE (t1
) == TREE_VALUE (t2
);
3659 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
));
3661 /* Maybe the lists are equal. */
3662 if (t1
== 0 && t2
== 0)
3665 for (; t2
!= 0; t2
= TREE_CHAIN (t2
))
3668 for (attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)), l1
);
3670 attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)),
3673 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) == 1)
3680 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) != 1)
3687 /* Given two lists of types
3688 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
3689 return 1 if the lists contain the same types in the same order.
3690 Also, the TREE_PURPOSEs must match. */
3693 type_list_equal (tree l1
, tree l2
)
3697 for (t1
= l1
, t2
= l2
; t1
&& t2
; t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
3698 if (TREE_VALUE (t1
) != TREE_VALUE (t2
)
3699 || (TREE_PURPOSE (t1
) != TREE_PURPOSE (t2
)
3700 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1
), TREE_PURPOSE (t2
))
3701 && (TREE_TYPE (TREE_PURPOSE (t1
))
3702 == TREE_TYPE (TREE_PURPOSE (t2
))))))
3708 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
3709 given by TYPE. If the argument list accepts variable arguments,
3710 then this function counts only the ordinary arguments. */
3713 type_num_arguments (tree type
)
3718 for (t
= TYPE_ARG_TYPES (type
); t
; t
= TREE_CHAIN (t
))
3719 /* If the function does not take a variable number of arguments,
3720 the last element in the list will have type `void'. */
3721 if (VOID_TYPE_P (TREE_VALUE (t
)))
3729 /* Nonzero if integer constants T1 and T2
3730 represent the same constant value. */
3733 tree_int_cst_equal (tree t1
, tree t2
)
3738 if (t1
== 0 || t2
== 0)
3741 if (TREE_CODE (t1
) == INTEGER_CST
3742 && TREE_CODE (t2
) == INTEGER_CST
3743 && TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
3744 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
))
3750 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
3751 The precise way of comparison depends on their data type. */
3754 tree_int_cst_lt (tree t1
, tree t2
)
3759 if (TYPE_UNSIGNED (TREE_TYPE (t1
)) != TYPE_UNSIGNED (TREE_TYPE (t2
)))
3761 int t1_sgn
= tree_int_cst_sgn (t1
);
3762 int t2_sgn
= tree_int_cst_sgn (t2
);
3764 if (t1_sgn
< t2_sgn
)
3766 else if (t1_sgn
> t2_sgn
)
3768 /* Otherwise, both are non-negative, so we compare them as
3769 unsigned just in case one of them would overflow a signed
3772 else if (!TYPE_UNSIGNED (TREE_TYPE (t1
)))
3773 return INT_CST_LT (t1
, t2
);
3775 return INT_CST_LT_UNSIGNED (t1
, t2
);
3778 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
3781 tree_int_cst_compare (tree t1
, tree t2
)
3783 if (tree_int_cst_lt (t1
, t2
))
3785 else if (tree_int_cst_lt (t2
, t1
))
3791 /* Return 1 if T is an INTEGER_CST that can be manipulated efficiently on
3792 the host. If POS is zero, the value can be represented in a single
3793 HOST_WIDE_INT. If POS is nonzero, the value must be positive and can
3794 be represented in a single unsigned HOST_WIDE_INT. */
3797 host_integerp (tree t
, int pos
)
3799 return (TREE_CODE (t
) == INTEGER_CST
3800 && ! TREE_OVERFLOW (t
)
3801 && ((TREE_INT_CST_HIGH (t
) == 0
3802 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) >= 0)
3803 || (! pos
&& TREE_INT_CST_HIGH (t
) == -1
3804 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0
3805 && !TYPE_UNSIGNED (TREE_TYPE (t
)))
3806 || (pos
&& TREE_INT_CST_HIGH (t
) == 0)));
3809 /* Return the HOST_WIDE_INT least significant bits of T if it is an
3810 INTEGER_CST and there is no overflow. POS is nonzero if the result must
3811 be positive. Abort if we cannot satisfy the above conditions. */
3814 tree_low_cst (tree t
, int pos
)
3816 gcc_assert (host_integerp (t
, pos
));
3817 return TREE_INT_CST_LOW (t
);
3820 /* Return the most significant bit of the integer constant T. */
3823 tree_int_cst_msb (tree t
)
3827 unsigned HOST_WIDE_INT l
;
3829 /* Note that using TYPE_PRECISION here is wrong. We care about the
3830 actual bits, not the (arbitrary) range of the type. */
3831 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t
))) - 1;
3832 rshift_double (TREE_INT_CST_LOW (t
), TREE_INT_CST_HIGH (t
), prec
,
3833 2 * HOST_BITS_PER_WIDE_INT
, &l
, &h
, 0);
3834 return (l
& 1) == 1;
3837 /* Return an indication of the sign of the integer constant T.
3838 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
3839 Note that -1 will never be returned it T's type is unsigned. */
3842 tree_int_cst_sgn (tree t
)
3844 if (TREE_INT_CST_LOW (t
) == 0 && TREE_INT_CST_HIGH (t
) == 0)
3846 else if (TYPE_UNSIGNED (TREE_TYPE (t
)))
3848 else if (TREE_INT_CST_HIGH (t
) < 0)
3854 /* Compare two constructor-element-type constants. Return 1 if the lists
3855 are known to be equal; otherwise return 0. */
3858 simple_cst_list_equal (tree l1
, tree l2
)
3860 while (l1
!= NULL_TREE
&& l2
!= NULL_TREE
)
3862 if (simple_cst_equal (TREE_VALUE (l1
), TREE_VALUE (l2
)) != 1)
3865 l1
= TREE_CHAIN (l1
);
3866 l2
= TREE_CHAIN (l2
);
3872 /* Return truthvalue of whether T1 is the same tree structure as T2.
3873 Return 1 if they are the same.
3874 Return 0 if they are understandably different.
3875 Return -1 if either contains tree structure not understood by
3879 simple_cst_equal (tree t1
, tree t2
)
3881 enum tree_code code1
, code2
;
3887 if (t1
== 0 || t2
== 0)
3890 code1
= TREE_CODE (t1
);
3891 code2
= TREE_CODE (t2
);
3893 if (code1
== NOP_EXPR
|| code1
== CONVERT_EXPR
|| code1
== NON_LVALUE_EXPR
)
3895 if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
3896 || code2
== NON_LVALUE_EXPR
)
3897 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3899 return simple_cst_equal (TREE_OPERAND (t1
, 0), t2
);
3902 else if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
3903 || code2
== NON_LVALUE_EXPR
)
3904 return simple_cst_equal (t1
, TREE_OPERAND (t2
, 0));
3912 return (TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
3913 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
));
3916 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3919 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3920 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3921 TREE_STRING_LENGTH (t1
)));
3924 return simple_cst_list_equal (CONSTRUCTOR_ELTS (t1
),
3925 CONSTRUCTOR_ELTS (t2
));
3928 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3931 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3935 simple_cst_list_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
3938 /* Special case: if either target is an unallocated VAR_DECL,
3939 it means that it's going to be unified with whatever the
3940 TARGET_EXPR is really supposed to initialize, so treat it
3941 as being equivalent to anything. */
3942 if ((TREE_CODE (TREE_OPERAND (t1
, 0)) == VAR_DECL
3943 && DECL_NAME (TREE_OPERAND (t1
, 0)) == NULL_TREE
3944 && !DECL_RTL_SET_P (TREE_OPERAND (t1
, 0)))
3945 || (TREE_CODE (TREE_OPERAND (t2
, 0)) == VAR_DECL
3946 && DECL_NAME (TREE_OPERAND (t2
, 0)) == NULL_TREE
3947 && !DECL_RTL_SET_P (TREE_OPERAND (t2
, 0))))
3950 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3955 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
3957 case WITH_CLEANUP_EXPR
:
3958 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3962 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t1
, 1));
3965 if (TREE_OPERAND (t1
, 1) == TREE_OPERAND (t2
, 1))
3966 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3980 /* This general rule works for most tree codes. All exceptions should be
3981 handled above. If this is a language-specific tree code, we can't
3982 trust what might be in the operand, so say we don't know
3984 if ((int) code1
>= (int) LAST_AND_UNUSED_TREE_CODE
)
3987 switch (TREE_CODE_CLASS (code1
))
3991 case tcc_comparison
:
3992 case tcc_expression
:
3996 for (i
= 0; i
< TREE_CODE_LENGTH (code1
); i
++)
3998 cmp
= simple_cst_equal (TREE_OPERAND (t1
, i
), TREE_OPERAND (t2
, i
));
4010 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
4011 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
4012 than U, respectively. */
4015 compare_tree_int (tree t
, unsigned HOST_WIDE_INT u
)
4017 if (tree_int_cst_sgn (t
) < 0)
4019 else if (TREE_INT_CST_HIGH (t
) != 0)
4021 else if (TREE_INT_CST_LOW (t
) == u
)
4023 else if (TREE_INT_CST_LOW (t
) < u
)
4029 /* Return true if CODE represents an associative tree code. Otherwise
4032 associative_tree_code (enum tree_code code
)
4051 /* Return true if CODE represents a commutative tree code. Otherwise
4054 commutative_tree_code (enum tree_code code
)
4067 case UNORDERED_EXPR
:
4071 case TRUTH_AND_EXPR
:
4072 case TRUTH_XOR_EXPR
:
4082 /* Generate a hash value for an expression. This can be used iteratively
4083 by passing a previous result as the "val" argument.
4085 This function is intended to produce the same hash for expressions which
4086 would compare equal using operand_equal_p. */
4089 iterative_hash_expr (tree t
, hashval_t val
)
4092 enum tree_code code
;
4096 return iterative_hash_pointer (t
, val
);
4098 code
= TREE_CODE (t
);
4102 /* Alas, constants aren't shared, so we can't rely on pointer
4105 val
= iterative_hash_host_wide_int (TREE_INT_CST_LOW (t
), val
);
4106 return iterative_hash_host_wide_int (TREE_INT_CST_HIGH (t
), val
);
4109 unsigned int val2
= real_hash (TREE_REAL_CST_PTR (t
));
4111 return iterative_hash_hashval_t (val2
, val
);
4114 return iterative_hash (TREE_STRING_POINTER (t
),
4115 TREE_STRING_LENGTH (t
), val
);
4117 val
= iterative_hash_expr (TREE_REALPART (t
), val
);
4118 return iterative_hash_expr (TREE_IMAGPART (t
), val
);
4120 return iterative_hash_expr (TREE_VECTOR_CST_ELTS (t
), val
);
4124 /* we can just compare by pointer. */
4125 return iterative_hash_pointer (t
, val
);
4128 /* A list of expressions, for a CALL_EXPR or as the elements of a
4130 for (; t
; t
= TREE_CHAIN (t
))
4131 val
= iterative_hash_expr (TREE_VALUE (t
), val
);
4134 /* When referring to a built-in FUNCTION_DECL, use the
4135 __builtin__ form. Otherwise nodes that compare equal
4136 according to operand_equal_p might get different
4138 if (DECL_BUILT_IN (t
))
4140 val
= iterative_hash_pointer (built_in_decls
[DECL_FUNCTION_CODE (t
)],
4144 /* else FALL THROUGH */
4146 class = TREE_CODE_CLASS (code
);
4148 if (class == tcc_declaration
)
4150 /* Otherwise, we can just compare decls by pointer. */
4151 val
= iterative_hash_pointer (t
, val
);
4155 gcc_assert (IS_EXPR_CODE_CLASS (class));
4157 val
= iterative_hash_object (code
, val
);
4159 /* Don't hash the type, that can lead to having nodes which
4160 compare equal according to operand_equal_p, but which
4161 have different hash codes. */
4162 if (code
== NOP_EXPR
4163 || code
== CONVERT_EXPR
4164 || code
== NON_LVALUE_EXPR
)
4166 /* Make sure to include signness in the hash computation. */
4167 val
+= TYPE_UNSIGNED (TREE_TYPE (t
));
4168 val
= iterative_hash_expr (TREE_OPERAND (t
, 0), val
);
4171 else if (commutative_tree_code (code
))
4173 /* It's a commutative expression. We want to hash it the same
4174 however it appears. We do this by first hashing both operands
4175 and then rehashing based on the order of their independent
4177 hashval_t one
= iterative_hash_expr (TREE_OPERAND (t
, 0), 0);
4178 hashval_t two
= iterative_hash_expr (TREE_OPERAND (t
, 1), 0);
4182 t
= one
, one
= two
, two
= t
;
4184 val
= iterative_hash_hashval_t (one
, val
);
4185 val
= iterative_hash_hashval_t (two
, val
);
4188 for (i
= TREE_CODE_LENGTH (code
) - 1; i
>= 0; --i
)
4189 val
= iterative_hash_expr (TREE_OPERAND (t
, i
), val
);
4196 /* Constructors for pointer, array and function types.
4197 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
4198 constructed by language-dependent code, not here.) */
4200 /* Construct, lay out and return the type of pointers to TO_TYPE with
4201 mode MODE. If CAN_ALIAS_ALL is TRUE, indicate this type can
4202 reference all of memory. If such a type has already been
4203 constructed, reuse it. */
4206 build_pointer_type_for_mode (tree to_type
, enum machine_mode mode
,
4211 /* In some cases, languages will have things that aren't a POINTER_TYPE
4212 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_POINTER_TO.
4213 In that case, return that type without regard to the rest of our
4216 ??? This is a kludge, but consistent with the way this function has
4217 always operated and there doesn't seem to be a good way to avoid this
4219 if (TYPE_POINTER_TO (to_type
) != 0
4220 && TREE_CODE (TYPE_POINTER_TO (to_type
)) != POINTER_TYPE
)
4221 return TYPE_POINTER_TO (to_type
);
4223 /* First, if we already have a type for pointers to TO_TYPE and it's
4224 the proper mode, use it. */
4225 for (t
= TYPE_POINTER_TO (to_type
); t
; t
= TYPE_NEXT_PTR_TO (t
))
4226 if (TYPE_MODE (t
) == mode
&& TYPE_REF_CAN_ALIAS_ALL (t
) == can_alias_all
)
4229 t
= make_node (POINTER_TYPE
);
4231 TREE_TYPE (t
) = to_type
;
4232 TYPE_MODE (t
) = mode
;
4233 TYPE_REF_CAN_ALIAS_ALL (t
) = can_alias_all
;
4234 TYPE_NEXT_PTR_TO (t
) = TYPE_POINTER_TO (to_type
);
4235 TYPE_POINTER_TO (to_type
) = t
;
4237 /* Lay out the type. This function has many callers that are concerned
4238 with expression-construction, and this simplifies them all. */
4244 /* By default build pointers in ptr_mode. */
4247 build_pointer_type (tree to_type
)
4249 return build_pointer_type_for_mode (to_type
, ptr_mode
, false);
4252 /* Same as build_pointer_type_for_mode, but for REFERENCE_TYPE. */
4255 build_reference_type_for_mode (tree to_type
, enum machine_mode mode
,
4260 /* In some cases, languages will have things that aren't a REFERENCE_TYPE
4261 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_REFERENCE_TO.
4262 In that case, return that type without regard to the rest of our
4265 ??? This is a kludge, but consistent with the way this function has
4266 always operated and there doesn't seem to be a good way to avoid this
4268 if (TYPE_REFERENCE_TO (to_type
) != 0
4269 && TREE_CODE (TYPE_REFERENCE_TO (to_type
)) != REFERENCE_TYPE
)
4270 return TYPE_REFERENCE_TO (to_type
);
4272 /* First, if we already have a type for pointers to TO_TYPE and it's
4273 the proper mode, use it. */
4274 for (t
= TYPE_REFERENCE_TO (to_type
); t
; t
= TYPE_NEXT_REF_TO (t
))
4275 if (TYPE_MODE (t
) == mode
&& TYPE_REF_CAN_ALIAS_ALL (t
) == can_alias_all
)
4278 t
= make_node (REFERENCE_TYPE
);
4280 TREE_TYPE (t
) = to_type
;
4281 TYPE_MODE (t
) = mode
;
4282 TYPE_REF_CAN_ALIAS_ALL (t
) = can_alias_all
;
4283 TYPE_NEXT_REF_TO (t
) = TYPE_REFERENCE_TO (to_type
);
4284 TYPE_REFERENCE_TO (to_type
) = t
;
4292 /* Build the node for the type of references-to-TO_TYPE by default
4296 build_reference_type (tree to_type
)
4298 return build_reference_type_for_mode (to_type
, ptr_mode
, false);
4301 /* Build a type that is compatible with t but has no cv quals anywhere
4304 const char *const *const * -> char ***. */
4307 build_type_no_quals (tree t
)
4309 switch (TREE_CODE (t
))
4312 return build_pointer_type_for_mode (build_type_no_quals (TREE_TYPE (t
)),
4314 TYPE_REF_CAN_ALIAS_ALL (t
));
4315 case REFERENCE_TYPE
:
4317 build_reference_type_for_mode (build_type_no_quals (TREE_TYPE (t
)),
4319 TYPE_REF_CAN_ALIAS_ALL (t
));
4321 return TYPE_MAIN_VARIANT (t
);
4325 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
4326 MAXVAL should be the maximum value in the domain
4327 (one less than the length of the array).
4329 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
4330 We don't enforce this limit, that is up to caller (e.g. language front end).
4331 The limit exists because the result is a signed type and we don't handle
4332 sizes that use more than one HOST_WIDE_INT. */
4335 build_index_type (tree maxval
)
4337 tree itype
= make_node (INTEGER_TYPE
);
4339 TREE_TYPE (itype
) = sizetype
;
4340 TYPE_PRECISION (itype
) = TYPE_PRECISION (sizetype
);
4341 TYPE_MIN_VALUE (itype
) = size_zero_node
;
4342 TYPE_MAX_VALUE (itype
) = fold_convert (sizetype
, maxval
);
4343 TYPE_MODE (itype
) = TYPE_MODE (sizetype
);
4344 TYPE_SIZE (itype
) = TYPE_SIZE (sizetype
);
4345 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (sizetype
);
4346 TYPE_ALIGN (itype
) = TYPE_ALIGN (sizetype
);
4347 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (sizetype
);
4349 if (host_integerp (maxval
, 1))
4350 return type_hash_canon (tree_low_cst (maxval
, 1), itype
);
4355 /* Builds a signed or unsigned integer type of precision PRECISION.
4356 Used for C bitfields whose precision does not match that of
4357 built-in target types. */
4359 build_nonstandard_integer_type (unsigned HOST_WIDE_INT precision
,
4362 tree itype
= make_node (INTEGER_TYPE
);
4364 TYPE_PRECISION (itype
) = precision
;
4367 fixup_unsigned_type (itype
);
4369 fixup_signed_type (itype
);
4371 if (host_integerp (TYPE_MAX_VALUE (itype
), 1))
4372 return type_hash_canon (tree_low_cst (TYPE_MAX_VALUE (itype
), 1), itype
);
4377 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
4378 ENUMERAL_TYPE, BOOLEAN_TYPE, or CHAR_TYPE), with
4379 low bound LOWVAL and high bound HIGHVAL.
4380 if TYPE==NULL_TREE, sizetype is used. */
4383 build_range_type (tree type
, tree lowval
, tree highval
)
4385 tree itype
= make_node (INTEGER_TYPE
);
4387 TREE_TYPE (itype
) = type
;
4388 if (type
== NULL_TREE
)
4391 TYPE_MIN_VALUE (itype
) = convert (type
, lowval
);
4392 TYPE_MAX_VALUE (itype
) = highval
? convert (type
, highval
) : NULL
;
4394 TYPE_PRECISION (itype
) = TYPE_PRECISION (type
);
4395 TYPE_MODE (itype
) = TYPE_MODE (type
);
4396 TYPE_SIZE (itype
) = TYPE_SIZE (type
);
4397 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (type
);
4398 TYPE_ALIGN (itype
) = TYPE_ALIGN (type
);
4399 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (type
);
4401 if (host_integerp (lowval
, 0) && highval
!= 0 && host_integerp (highval
, 0))
4402 return type_hash_canon (tree_low_cst (highval
, 0)
4403 - tree_low_cst (lowval
, 0),
4409 /* Just like build_index_type, but takes lowval and highval instead
4410 of just highval (maxval). */
4413 build_index_2_type (tree lowval
, tree highval
)
4415 return build_range_type (sizetype
, lowval
, highval
);
4418 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
4419 and number of elements specified by the range of values of INDEX_TYPE.
4420 If such a type has already been constructed, reuse it. */
4423 build_array_type (tree elt_type
, tree index_type
)
4426 hashval_t hashcode
= 0;
4428 if (TREE_CODE (elt_type
) == FUNCTION_TYPE
)
4430 error ("arrays of functions are not meaningful");
4431 elt_type
= integer_type_node
;
4434 t
= make_node (ARRAY_TYPE
);
4435 TREE_TYPE (t
) = elt_type
;
4436 TYPE_DOMAIN (t
) = index_type
;
4438 if (index_type
== 0)
4444 hashcode
= iterative_hash_object (TYPE_HASH (elt_type
), hashcode
);
4445 hashcode
= iterative_hash_object (TYPE_HASH (index_type
), hashcode
);
4446 t
= type_hash_canon (hashcode
, t
);
4448 if (!COMPLETE_TYPE_P (t
))
4453 /* Return the TYPE of the elements comprising
4454 the innermost dimension of ARRAY. */
4457 get_inner_array_type (tree array
)
4459 tree type
= TREE_TYPE (array
);
4461 while (TREE_CODE (type
) == ARRAY_TYPE
)
4462 type
= TREE_TYPE (type
);
4467 /* Construct, lay out and return
4468 the type of functions returning type VALUE_TYPE
4469 given arguments of types ARG_TYPES.
4470 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
4471 are data type nodes for the arguments of the function.
4472 If such a type has already been constructed, reuse it. */
4475 build_function_type (tree value_type
, tree arg_types
)
4478 hashval_t hashcode
= 0;
4480 if (TREE_CODE (value_type
) == FUNCTION_TYPE
)
4482 error ("function return type cannot be function");
4483 value_type
= integer_type_node
;
4486 /* Make a node of the sort we want. */
4487 t
= make_node (FUNCTION_TYPE
);
4488 TREE_TYPE (t
) = value_type
;
4489 TYPE_ARG_TYPES (t
) = arg_types
;
4491 /* If we already have such a type, use the old one. */
4492 hashcode
= iterative_hash_object (TYPE_HASH (value_type
), hashcode
);
4493 hashcode
= type_hash_list (arg_types
, hashcode
);
4494 t
= type_hash_canon (hashcode
, t
);
4496 if (!COMPLETE_TYPE_P (t
))
4501 /* Build a function type. The RETURN_TYPE is the type returned by the
4502 function. If additional arguments are provided, they are
4503 additional argument types. The list of argument types must always
4504 be terminated by NULL_TREE. */
4507 build_function_type_list (tree return_type
, ...)
4512 va_start (p
, return_type
);
4514 t
= va_arg (p
, tree
);
4515 for (args
= NULL_TREE
; t
!= NULL_TREE
; t
= va_arg (p
, tree
))
4516 args
= tree_cons (NULL_TREE
, t
, args
);
4519 args
= nreverse (args
);
4520 TREE_CHAIN (last
) = void_list_node
;
4521 args
= build_function_type (return_type
, args
);
4527 /* Build a METHOD_TYPE for a member of BASETYPE. The RETTYPE (a TYPE)
4528 and ARGTYPES (a TREE_LIST) are the return type and arguments types
4529 for the method. An implicit additional parameter (of type
4530 pointer-to-BASETYPE) is added to the ARGTYPES. */
4533 build_method_type_directly (tree basetype
,
4541 /* Make a node of the sort we want. */
4542 t
= make_node (METHOD_TYPE
);
4544 TYPE_METHOD_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
4545 TREE_TYPE (t
) = rettype
;
4546 ptype
= build_pointer_type (basetype
);
4548 /* The actual arglist for this function includes a "hidden" argument
4549 which is "this". Put it into the list of argument types. */
4550 argtypes
= tree_cons (NULL_TREE
, ptype
, argtypes
);
4551 TYPE_ARG_TYPES (t
) = argtypes
;
4553 /* If we already have such a type, use the old one. */
4554 hashcode
= iterative_hash_object (TYPE_HASH (basetype
), hashcode
);
4555 hashcode
= iterative_hash_object (TYPE_HASH (rettype
), hashcode
);
4556 hashcode
= type_hash_list (argtypes
, hashcode
);
4557 t
= type_hash_canon (hashcode
, t
);
4559 if (!COMPLETE_TYPE_P (t
))
4565 /* Construct, lay out and return the type of methods belonging to class
4566 BASETYPE and whose arguments and values are described by TYPE.
4567 If that type exists already, reuse it.
4568 TYPE must be a FUNCTION_TYPE node. */
4571 build_method_type (tree basetype
, tree type
)
4573 gcc_assert (TREE_CODE (type
) == FUNCTION_TYPE
);
4575 return build_method_type_directly (basetype
,
4577 TYPE_ARG_TYPES (type
));
4580 /* Construct, lay out and return the type of offsets to a value
4581 of type TYPE, within an object of type BASETYPE.
4582 If a suitable offset type exists already, reuse it. */
4585 build_offset_type (tree basetype
, tree type
)
4588 hashval_t hashcode
= 0;
4590 /* Make a node of the sort we want. */
4591 t
= make_node (OFFSET_TYPE
);
4593 TYPE_OFFSET_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
4594 TREE_TYPE (t
) = type
;
4596 /* If we already have such a type, use the old one. */
4597 hashcode
= iterative_hash_object (TYPE_HASH (basetype
), hashcode
);
4598 hashcode
= iterative_hash_object (TYPE_HASH (type
), hashcode
);
4599 t
= type_hash_canon (hashcode
, t
);
4601 if (!COMPLETE_TYPE_P (t
))
4607 /* Create a complex type whose components are COMPONENT_TYPE. */
4610 build_complex_type (tree component_type
)
4615 /* Make a node of the sort we want. */
4616 t
= make_node (COMPLEX_TYPE
);
4618 TREE_TYPE (t
) = TYPE_MAIN_VARIANT (component_type
);
4620 /* If we already have such a type, use the old one. */
4621 hashcode
= iterative_hash_object (TYPE_HASH (component_type
), 0);
4622 t
= type_hash_canon (hashcode
, t
);
4624 if (!COMPLETE_TYPE_P (t
))
4627 /* If we are writing Dwarf2 output we need to create a name,
4628 since complex is a fundamental type. */
4629 if ((write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
4633 if (component_type
== char_type_node
)
4634 name
= "complex char";
4635 else if (component_type
== signed_char_type_node
)
4636 name
= "complex signed char";
4637 else if (component_type
== unsigned_char_type_node
)
4638 name
= "complex unsigned char";
4639 else if (component_type
== short_integer_type_node
)
4640 name
= "complex short int";
4641 else if (component_type
== short_unsigned_type_node
)
4642 name
= "complex short unsigned int";
4643 else if (component_type
== integer_type_node
)
4644 name
= "complex int";
4645 else if (component_type
== unsigned_type_node
)
4646 name
= "complex unsigned int";
4647 else if (component_type
== long_integer_type_node
)
4648 name
= "complex long int";
4649 else if (component_type
== long_unsigned_type_node
)
4650 name
= "complex long unsigned int";
4651 else if (component_type
== long_long_integer_type_node
)
4652 name
= "complex long long int";
4653 else if (component_type
== long_long_unsigned_type_node
)
4654 name
= "complex long long unsigned int";
4659 TYPE_NAME (t
) = get_identifier (name
);
4662 return build_qualified_type (t
, TYPE_QUALS (component_type
));
4665 /* Return OP, stripped of any conversions to wider types as much as is safe.
4666 Converting the value back to OP's type makes a value equivalent to OP.
4668 If FOR_TYPE is nonzero, we return a value which, if converted to
4669 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
4671 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
4672 narrowest type that can hold the value, even if they don't exactly fit.
4673 Otherwise, bit-field references are changed to a narrower type
4674 only if they can be fetched directly from memory in that type.
4676 OP must have integer, real or enumeral type. Pointers are not allowed!
4678 There are some cases where the obvious value we could return
4679 would regenerate to OP if converted to OP's type,
4680 but would not extend like OP to wider types.
4681 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
4682 For example, if OP is (unsigned short)(signed char)-1,
4683 we avoid returning (signed char)-1 if FOR_TYPE is int,
4684 even though extending that to an unsigned short would regenerate OP,
4685 since the result of extending (signed char)-1 to (int)
4686 is different from (int) OP. */
4689 get_unwidened (tree op
, tree for_type
)
4691 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
4692 tree type
= TREE_TYPE (op
);
4694 = TYPE_PRECISION (for_type
!= 0 ? for_type
: type
);
4696 = (for_type
!= 0 && for_type
!= type
4697 && final_prec
> TYPE_PRECISION (type
)
4698 && TYPE_UNSIGNED (type
));
4701 while (TREE_CODE (op
) == NOP_EXPR
)
4704 = TYPE_PRECISION (TREE_TYPE (op
))
4705 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0)));
4707 /* Truncations are many-one so cannot be removed.
4708 Unless we are later going to truncate down even farther. */
4710 && final_prec
> TYPE_PRECISION (TREE_TYPE (op
)))
4713 /* See what's inside this conversion. If we decide to strip it,
4715 op
= TREE_OPERAND (op
, 0);
4717 /* If we have not stripped any zero-extensions (uns is 0),
4718 we can strip any kind of extension.
4719 If we have previously stripped a zero-extension,
4720 only zero-extensions can safely be stripped.
4721 Any extension can be stripped if the bits it would produce
4722 are all going to be discarded later by truncating to FOR_TYPE. */
4726 if (! uns
|| final_prec
<= TYPE_PRECISION (TREE_TYPE (op
)))
4728 /* TYPE_UNSIGNED says whether this is a zero-extension.
4729 Let's avoid computing it if it does not affect WIN
4730 and if UNS will not be needed again. */
4731 if ((uns
|| TREE_CODE (op
) == NOP_EXPR
)
4732 && TYPE_UNSIGNED (TREE_TYPE (op
)))
4740 if (TREE_CODE (op
) == COMPONENT_REF
4741 /* Since type_for_size always gives an integer type. */
4742 && TREE_CODE (type
) != REAL_TYPE
4743 /* Don't crash if field not laid out yet. */
4744 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
4745 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
4747 unsigned int innerprec
4748 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
4749 int unsignedp
= (DECL_UNSIGNED (TREE_OPERAND (op
, 1))
4750 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op
, 1))));
4751 type
= lang_hooks
.types
.type_for_size (innerprec
, unsignedp
);
4753 /* We can get this structure field in the narrowest type it fits in.
4754 If FOR_TYPE is 0, do this only for a field that matches the
4755 narrower type exactly and is aligned for it
4756 The resulting extension to its nominal type (a fullword type)
4757 must fit the same conditions as for other extensions. */
4760 && INT_CST_LT_UNSIGNED (TYPE_SIZE (type
), TYPE_SIZE (TREE_TYPE (op
)))
4761 && (for_type
|| ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1)))
4762 && (! uns
|| final_prec
<= innerprec
|| unsignedp
))
4764 win
= build3 (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
4765 TREE_OPERAND (op
, 1), NULL_TREE
);
4766 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
4767 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
4774 /* Return OP or a simpler expression for a narrower value
4775 which can be sign-extended or zero-extended to give back OP.
4776 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
4777 or 0 if the value should be sign-extended. */
4780 get_narrower (tree op
, int *unsignedp_ptr
)
4785 bool integral_p
= INTEGRAL_TYPE_P (TREE_TYPE (op
));
4787 while (TREE_CODE (op
) == NOP_EXPR
)
4790 = (TYPE_PRECISION (TREE_TYPE (op
))
4791 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0))));
4793 /* Truncations are many-one so cannot be removed. */
4797 /* See what's inside this conversion. If we decide to strip it,
4802 op
= TREE_OPERAND (op
, 0);
4803 /* An extension: the outermost one can be stripped,
4804 but remember whether it is zero or sign extension. */
4806 uns
= TYPE_UNSIGNED (TREE_TYPE (op
));
4807 /* Otherwise, if a sign extension has been stripped,
4808 only sign extensions can now be stripped;
4809 if a zero extension has been stripped, only zero-extensions. */
4810 else if (uns
!= TYPE_UNSIGNED (TREE_TYPE (op
)))
4814 else /* bitschange == 0 */
4816 /* A change in nominal type can always be stripped, but we must
4817 preserve the unsignedness. */
4819 uns
= TYPE_UNSIGNED (TREE_TYPE (op
));
4821 op
= TREE_OPERAND (op
, 0);
4822 /* Keep trying to narrow, but don't assign op to win if it
4823 would turn an integral type into something else. */
4824 if (INTEGRAL_TYPE_P (TREE_TYPE (op
)) != integral_p
)
4831 if (TREE_CODE (op
) == COMPONENT_REF
4832 /* Since type_for_size always gives an integer type. */
4833 && TREE_CODE (TREE_TYPE (op
)) != REAL_TYPE
4834 /* Ensure field is laid out already. */
4835 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
4836 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
4838 unsigned HOST_WIDE_INT innerprec
4839 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
4840 int unsignedp
= (DECL_UNSIGNED (TREE_OPERAND (op
, 1))
4841 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op
, 1))));
4842 tree type
= lang_hooks
.types
.type_for_size (innerprec
, unsignedp
);
4844 /* We can get this structure field in a narrower type that fits it,
4845 but the resulting extension to its nominal type (a fullword type)
4846 must satisfy the same conditions as for other extensions.
4848 Do this only for fields that are aligned (not bit-fields),
4849 because when bit-field insns will be used there is no
4850 advantage in doing this. */
4852 if (innerprec
< TYPE_PRECISION (TREE_TYPE (op
))
4853 && ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1))
4854 && (first
|| uns
== DECL_UNSIGNED (TREE_OPERAND (op
, 1)))
4858 uns
= DECL_UNSIGNED (TREE_OPERAND (op
, 1));
4859 win
= build3 (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
4860 TREE_OPERAND (op
, 1), NULL_TREE
);
4861 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
4862 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
4865 *unsignedp_ptr
= uns
;
4869 /* Nonzero if integer constant C has a value that is permissible
4870 for type TYPE (an INTEGER_TYPE). */
4873 int_fits_type_p (tree c
, tree type
)
4875 tree type_low_bound
= TYPE_MIN_VALUE (type
);
4876 tree type_high_bound
= TYPE_MAX_VALUE (type
);
4877 bool ok_for_low_bound
, ok_for_high_bound
;
4880 /* If at least one bound of the type is a constant integer, we can check
4881 ourselves and maybe make a decision. If no such decision is possible, but
4882 this type is a subtype, try checking against that. Otherwise, use
4883 force_fit_type, which checks against the precision.
4885 Compute the status for each possibly constant bound, and return if we see
4886 one does not match. Use ok_for_xxx_bound for this purpose, assigning -1
4887 for "unknown if constant fits", 0 for "constant known *not* to fit" and 1
4888 for "constant known to fit". */
4890 /* Check if C >= type_low_bound. */
4891 if (type_low_bound
&& TREE_CODE (type_low_bound
) == INTEGER_CST
)
4893 if (tree_int_cst_lt (c
, type_low_bound
))
4895 ok_for_low_bound
= true;
4898 ok_for_low_bound
= false;
4900 /* Check if c <= type_high_bound. */
4901 if (type_high_bound
&& TREE_CODE (type_high_bound
) == INTEGER_CST
)
4903 if (tree_int_cst_lt (type_high_bound
, c
))
4905 ok_for_high_bound
= true;
4908 ok_for_high_bound
= false;
4910 /* If the constant fits both bounds, the result is known. */
4911 if (ok_for_low_bound
&& ok_for_high_bound
)
4914 /* Perform some generic filtering which may allow making a decision
4915 even if the bounds are not constant. First, negative integers
4916 never fit in unsigned types, */
4917 if (TYPE_UNSIGNED (type
) && tree_int_cst_sgn (c
) < 0)
4920 /* Second, narrower types always fit in wider ones. */
4921 if (TYPE_PRECISION (type
) > TYPE_PRECISION (TREE_TYPE (c
)))
4924 /* Third, unsigned integers with top bit set never fit signed types. */
4925 if (! TYPE_UNSIGNED (type
)
4926 && TYPE_UNSIGNED (TREE_TYPE (c
))
4927 && tree_int_cst_msb (c
))
4930 /* If we haven't been able to decide at this point, there nothing more we
4931 can check ourselves here. Look at the base type if we have one. */
4932 if (TREE_CODE (type
) == INTEGER_TYPE
&& TREE_TYPE (type
) != 0)
4933 return int_fits_type_p (c
, TREE_TYPE (type
));
4935 /* Or to force_fit_type, if nothing else. */
4936 tmp
= copy_node (c
);
4937 TREE_TYPE (tmp
) = type
;
4938 tmp
= force_fit_type (tmp
, -1, false, false);
4939 return TREE_INT_CST_HIGH (tmp
) == TREE_INT_CST_HIGH (c
)
4940 && TREE_INT_CST_LOW (tmp
) == TREE_INT_CST_LOW (c
);
4943 /* Subprogram of following function. Called by walk_tree.
4945 Return *TP if it is an automatic variable or parameter of the
4946 function passed in as DATA. */
4949 find_var_from_fn (tree
*tp
, int *walk_subtrees
, void *data
)
4951 tree fn
= (tree
) data
;
4956 else if (DECL_P (*tp
)
4957 && lang_hooks
.tree_inlining
.auto_var_in_fn_p (*tp
, fn
))
4963 /* Returns true if T is, contains, or refers to a type with variable
4964 size. If FN is nonzero, only return true if a modifier of the type
4965 or position of FN is a variable or parameter inside FN.
4967 This concept is more general than that of C99 'variably modified types':
4968 in C99, a struct type is never variably modified because a VLA may not
4969 appear as a structure member. However, in GNU C code like:
4971 struct S { int i[f()]; };
4973 is valid, and other languages may define similar constructs. */
4976 variably_modified_type_p (tree type
, tree fn
)
4980 /* Test if T is either variable (if FN is zero) or an expression containing
4981 a variable in FN. */
4982 #define RETURN_TRUE_IF_VAR(T) \
4983 do { tree _t = (T); \
4984 if (_t && _t != error_mark_node && TREE_CODE (_t) != INTEGER_CST \
4985 && (!fn || walk_tree (&_t, find_var_from_fn, fn, NULL))) \
4986 return true; } while (0)
4988 if (type
== error_mark_node
)
4991 /* If TYPE itself has variable size, it is variably modified.
4993 We do not yet have a representation of the C99 '[*]' syntax.
4994 When a representation is chosen, this function should be modified
4995 to test for that case as well. */
4996 RETURN_TRUE_IF_VAR (TYPE_SIZE (type
));
4997 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT(type
));
4999 switch (TREE_CODE (type
))
5002 case REFERENCE_TYPE
:
5005 if (variably_modified_type_p (TREE_TYPE (type
), fn
))
5011 /* If TYPE is a function type, it is variably modified if any of the
5012 parameters or the return type are variably modified. */
5013 if (variably_modified_type_p (TREE_TYPE (type
), fn
))
5016 for (t
= TYPE_ARG_TYPES (type
);
5017 t
&& t
!= void_list_node
;
5019 if (variably_modified_type_p (TREE_VALUE (t
), fn
))
5028 /* Scalar types are variably modified if their end points
5030 RETURN_TRUE_IF_VAR (TYPE_MIN_VALUE (type
));
5031 RETURN_TRUE_IF_VAR (TYPE_MAX_VALUE (type
));
5036 case QUAL_UNION_TYPE
:
5037 /* We can't see if any of the field are variably-modified by the
5038 definition we normally use, since that would produce infinite
5039 recursion via pointers. */
5040 /* This is variably modified if some field's type is. */
5041 for (t
= TYPE_FIELDS (type
); t
; t
= TREE_CHAIN (t
))
5042 if (TREE_CODE (t
) == FIELD_DECL
)
5044 RETURN_TRUE_IF_VAR (DECL_FIELD_OFFSET (t
));
5045 RETURN_TRUE_IF_VAR (DECL_SIZE (t
));
5046 RETURN_TRUE_IF_VAR (DECL_SIZE_UNIT (t
));
5048 if (TREE_CODE (type
) == QUAL_UNION_TYPE
)
5049 RETURN_TRUE_IF_VAR (DECL_QUALIFIER (t
));
5057 /* The current language may have other cases to check, but in general,
5058 all other types are not variably modified. */
5059 return lang_hooks
.tree_inlining
.var_mod_type_p (type
, fn
);
5061 #undef RETURN_TRUE_IF_VAR
5064 /* Given a DECL or TYPE, return the scope in which it was declared, or
5065 NULL_TREE if there is no containing scope. */
5068 get_containing_scope (tree t
)
5070 return (TYPE_P (t
) ? TYPE_CONTEXT (t
) : DECL_CONTEXT (t
));
5073 /* Return the innermost context enclosing DECL that is
5074 a FUNCTION_DECL, or zero if none. */
5077 decl_function_context (tree decl
)
5081 if (TREE_CODE (decl
) == ERROR_MARK
)
5084 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
5085 where we look up the function at runtime. Such functions always take
5086 a first argument of type 'pointer to real context'.
5088 C++ should really be fixed to use DECL_CONTEXT for the real context,
5089 and use something else for the "virtual context". */
5090 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_VINDEX (decl
))
5093 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl
)))));
5095 context
= DECL_CONTEXT (decl
);
5097 while (context
&& TREE_CODE (context
) != FUNCTION_DECL
)
5099 if (TREE_CODE (context
) == BLOCK
)
5100 context
= BLOCK_SUPERCONTEXT (context
);
5102 context
= get_containing_scope (context
);
5108 /* Return the innermost context enclosing DECL that is
5109 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
5110 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
5113 decl_type_context (tree decl
)
5115 tree context
= DECL_CONTEXT (decl
);
5118 switch (TREE_CODE (context
))
5120 case NAMESPACE_DECL
:
5121 case TRANSLATION_UNIT_DECL
:
5126 case QUAL_UNION_TYPE
:
5131 context
= DECL_CONTEXT (context
);
5135 context
= BLOCK_SUPERCONTEXT (context
);
5145 /* CALL is a CALL_EXPR. Return the declaration for the function
5146 called, or NULL_TREE if the called function cannot be
5150 get_callee_fndecl (tree call
)
5154 /* It's invalid to call this function with anything but a
5156 gcc_assert (TREE_CODE (call
) == CALL_EXPR
);
5158 /* The first operand to the CALL is the address of the function
5160 addr
= TREE_OPERAND (call
, 0);
5164 /* If this is a readonly function pointer, extract its initial value. */
5165 if (DECL_P (addr
) && TREE_CODE (addr
) != FUNCTION_DECL
5166 && TREE_READONLY (addr
) && ! TREE_THIS_VOLATILE (addr
)
5167 && DECL_INITIAL (addr
))
5168 addr
= DECL_INITIAL (addr
);
5170 /* If the address is just `&f' for some function `f', then we know
5171 that `f' is being called. */
5172 if (TREE_CODE (addr
) == ADDR_EXPR
5173 && TREE_CODE (TREE_OPERAND (addr
, 0)) == FUNCTION_DECL
)
5174 return TREE_OPERAND (addr
, 0);
5176 /* We couldn't figure out what was being called. Maybe the front
5177 end has some idea. */
5178 return lang_hooks
.lang_get_callee_fndecl (call
);
5181 /* Print debugging information about tree nodes generated during the compile,
5182 and any language-specific information. */
5185 dump_tree_statistics (void)
5187 #ifdef GATHER_STATISTICS
5189 int total_nodes
, total_bytes
;
5192 fprintf (stderr
, "\n??? tree nodes created\n\n");
5193 #ifdef GATHER_STATISTICS
5194 fprintf (stderr
, "Kind Nodes Bytes\n");
5195 fprintf (stderr
, "---------------------------------------\n");
5196 total_nodes
= total_bytes
= 0;
5197 for (i
= 0; i
< (int) all_kinds
; i
++)
5199 fprintf (stderr
, "%-20s %7d %10d\n", tree_node_kind_names
[i
],
5200 tree_node_counts
[i
], tree_node_sizes
[i
]);
5201 total_nodes
+= tree_node_counts
[i
];
5202 total_bytes
+= tree_node_sizes
[i
];
5204 fprintf (stderr
, "---------------------------------------\n");
5205 fprintf (stderr
, "%-20s %7d %10d\n", "Total", total_nodes
, total_bytes
);
5206 fprintf (stderr
, "---------------------------------------\n");
5207 ssanames_print_statistics ();
5208 phinodes_print_statistics ();
5210 fprintf (stderr
, "(No per-node statistics)\n");
5212 print_type_hash_statistics ();
5213 lang_hooks
.print_statistics ();
5216 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
5218 /* Generate a crc32 of a string. */
5221 crc32_string (unsigned chksum
, const char *string
)
5225 unsigned value
= *string
<< 24;
5228 for (ix
= 8; ix
--; value
<<= 1)
5232 feedback
= (value
^ chksum
) & 0x80000000 ? 0x04c11db7 : 0;
5241 /* P is a string that will be used in a symbol. Mask out any characters
5242 that are not valid in that context. */
5245 clean_symbol_name (char *p
)
5249 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
5252 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
5259 /* Generate a name for a function unique to this translation unit.
5260 TYPE is some string to identify the purpose of this function to the
5261 linker or collect2. */
5264 get_file_function_name_long (const char *type
)
5270 if (first_global_object_name
)
5271 p
= first_global_object_name
;
5274 /* We don't have anything that we know to be unique to this translation
5275 unit, so use what we do have and throw in some randomness. */
5277 const char *name
= weak_global_object_name
;
5278 const char *file
= main_input_filename
;
5283 file
= input_filename
;
5285 len
= strlen (file
);
5286 q
= alloca (9 * 2 + len
+ 1);
5287 memcpy (q
, file
, len
+ 1);
5288 clean_symbol_name (q
);
5290 sprintf (q
+ len
, "_%08X_%08X", crc32_string (0, name
),
5291 crc32_string (0, flag_random_seed
));
5296 buf
= alloca (sizeof (FILE_FUNCTION_FORMAT
) + strlen (p
) + strlen (type
));
5298 /* Set up the name of the file-level functions we may need.
5299 Use a global object (which is already required to be unique over
5300 the program) rather than the file name (which imposes extra
5302 sprintf (buf
, FILE_FUNCTION_FORMAT
, type
, p
);
5304 return get_identifier (buf
);
5307 /* If KIND=='I', return a suitable global initializer (constructor) name.
5308 If KIND=='D', return a suitable global clean-up (destructor) name. */
5311 get_file_function_name (int kind
)
5318 return get_file_function_name_long (p
);
5321 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
5322 The result is placed in BUFFER (which has length BIT_SIZE),
5323 with one bit in each char ('\000' or '\001').
5325 If the constructor is constant, NULL_TREE is returned.
5326 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
5329 get_set_constructor_bits (tree init
, char *buffer
, int bit_size
)
5333 HOST_WIDE_INT domain_min
5334 = tree_low_cst (TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (init
))), 0);
5335 tree non_const_bits
= NULL_TREE
;
5337 for (i
= 0; i
< bit_size
; i
++)
5340 for (vals
= TREE_OPERAND (init
, 1);
5341 vals
!= NULL_TREE
; vals
= TREE_CHAIN (vals
))
5343 if (!host_integerp (TREE_VALUE (vals
), 0)
5344 || (TREE_PURPOSE (vals
) != NULL_TREE
5345 && !host_integerp (TREE_PURPOSE (vals
), 0)))
5347 = tree_cons (TREE_PURPOSE (vals
), TREE_VALUE (vals
), non_const_bits
);
5348 else if (TREE_PURPOSE (vals
) != NULL_TREE
)
5350 /* Set a range of bits to ones. */
5351 HOST_WIDE_INT lo_index
5352 = tree_low_cst (TREE_PURPOSE (vals
), 0) - domain_min
;
5353 HOST_WIDE_INT hi_index
5354 = tree_low_cst (TREE_VALUE (vals
), 0) - domain_min
;
5356 gcc_assert (lo_index
>= 0);
5357 gcc_assert (lo_index
< bit_size
);
5358 gcc_assert (hi_index
>= 0);
5359 gcc_assert (hi_index
< bit_size
);
5360 for (; lo_index
<= hi_index
; lo_index
++)
5361 buffer
[lo_index
] = 1;
5365 /* Set a single bit to one. */
5367 = tree_low_cst (TREE_VALUE (vals
), 0) - domain_min
;
5368 if (index
< 0 || index
>= bit_size
)
5370 error ("invalid initializer for bit string");
5376 return non_const_bits
;
5379 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
5380 The result is placed in BUFFER (which is an array of bytes).
5381 If the constructor is constant, NULL_TREE is returned.
5382 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
5385 get_set_constructor_bytes (tree init
, unsigned char *buffer
, int wd_size
)
5388 int set_word_size
= BITS_PER_UNIT
;
5389 int bit_size
= wd_size
* set_word_size
;
5391 unsigned char *bytep
= buffer
;
5392 char *bit_buffer
= alloca (bit_size
);
5393 tree non_const_bits
= get_set_constructor_bits (init
, bit_buffer
, bit_size
);
5395 for (i
= 0; i
< wd_size
; i
++)
5398 for (i
= 0; i
< bit_size
; i
++)
5402 if (BYTES_BIG_ENDIAN
)
5403 *bytep
|= (1 << (set_word_size
- 1 - bit_pos
));
5405 *bytep
|= 1 << bit_pos
;
5408 if (bit_pos
>= set_word_size
)
5409 bit_pos
= 0, bytep
++;
5411 return non_const_bits
;
5414 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
5416 /* Complain that the tree code of NODE does not match the expected 0
5417 terminated list of trailing codes. The trailing code list can be
5418 empty, for a more vague error message. FILE, LINE, and FUNCTION
5419 are of the caller. */
5422 tree_check_failed (const tree node
, const char *file
,
5423 int line
, const char *function
, ...)
5427 unsigned length
= 0;
5430 va_start (args
, function
);
5431 while ((code
= va_arg (args
, int)))
5432 length
+= 4 + strlen (tree_code_name
[code
]);
5436 va_start (args
, function
);
5437 length
+= strlen ("expected ");
5438 buffer
= alloca (length
);
5440 while ((code
= va_arg (args
, int)))
5442 const char *prefix
= length
? " or " : "expected ";
5444 strcpy (buffer
+ length
, prefix
);
5445 length
+= strlen (prefix
);
5446 strcpy (buffer
+ length
, tree_code_name
[code
]);
5447 length
+= strlen (tree_code_name
[code
]);
5452 buffer
= (char *)"unexpected node";
5454 internal_error ("tree check: %s, have %s in %s, at %s:%d",
5455 buffer
, tree_code_name
[TREE_CODE (node
)],
5456 function
, trim_filename (file
), line
);
5459 /* Complain that the tree code of NODE does match the expected 0
5460 terminated list of trailing codes. FILE, LINE, and FUNCTION are of
5464 tree_not_check_failed (const tree node
, const char *file
,
5465 int line
, const char *function
, ...)
5469 unsigned length
= 0;
5472 va_start (args
, function
);
5473 while ((code
= va_arg (args
, int)))
5474 length
+= 4 + strlen (tree_code_name
[code
]);
5476 va_start (args
, function
);
5477 buffer
= alloca (length
);
5479 while ((code
= va_arg (args
, int)))
5483 strcpy (buffer
+ length
, " or ");
5486 strcpy (buffer
+ length
, tree_code_name
[code
]);
5487 length
+= strlen (tree_code_name
[code
]);
5491 internal_error ("tree check: expected none of %s, have %s in %s, at %s:%d",
5492 buffer
, tree_code_name
[TREE_CODE (node
)],
5493 function
, trim_filename (file
), line
);
5496 /* Similar to tree_check_failed, except that we check for a class of tree
5497 code, given in CL. */
5500 tree_class_check_failed (const tree node
, const enum tree_code_class cl
,
5501 const char *file
, int line
, const char *function
)
5504 ("tree check: expected class %qs, have %qs (%s) in %s, at %s:%d",
5505 TREE_CODE_CLASS_STRING (cl
),
5506 TREE_CODE_CLASS_STRING (TREE_CODE_CLASS (TREE_CODE (node
))),
5507 tree_code_name
[TREE_CODE (node
)], function
, trim_filename (file
), line
);
5510 /* Similar to above, except that the check is for the bounds of a TREE_VEC's
5511 (dynamically sized) vector. */
5514 tree_vec_elt_check_failed (int idx
, int len
, const char *file
, int line
,
5515 const char *function
)
5518 ("tree check: accessed elt %d of tree_vec with %d elts in %s, at %s:%d",
5519 idx
+ 1, len
, function
, trim_filename (file
), line
);
5522 /* Similar to above, except that the check is for the bounds of a PHI_NODE's
5523 (dynamically sized) vector. */
5526 phi_node_elt_check_failed (int idx
, int len
, const char *file
, int line
,
5527 const char *function
)
5530 ("tree check: accessed elt %d of phi_node with %d elts in %s, at %s:%d",
5531 idx
+ 1, len
, function
, trim_filename (file
), line
);
5534 /* Similar to above, except that the check is for the bounds of the operand
5535 vector of an expression node. */
5538 tree_operand_check_failed (int idx
, enum tree_code code
, const char *file
,
5539 int line
, const char *function
)
5542 ("tree check: accessed operand %d of %s with %d operands in %s, at %s:%d",
5543 idx
+ 1, tree_code_name
[code
], TREE_CODE_LENGTH (code
),
5544 function
, trim_filename (file
), line
);
5546 #endif /* ENABLE_TREE_CHECKING */
5548 /* Create a new vector type node holding SUBPARTS units of type INNERTYPE,
5549 and mapped to the machine mode MODE. Initialize its fields and build
5550 the information necessary for debugging output. */
5553 make_vector_type (tree innertype
, int nunits
, enum machine_mode mode
)
5555 tree t
= make_node (VECTOR_TYPE
);
5557 TREE_TYPE (t
) = TYPE_MAIN_VARIANT (innertype
);
5558 TYPE_VECTOR_SUBPARTS (t
) = nunits
;
5559 TYPE_MODE (t
) = mode
;
5560 TYPE_READONLY (t
) = TYPE_READONLY (innertype
);
5561 TYPE_VOLATILE (t
) = TYPE_VOLATILE (innertype
);
5566 tree index
= build_int_cst (NULL_TREE
, nunits
- 1);
5567 tree array
= build_array_type (innertype
, build_index_type (index
));
5568 tree rt
= make_node (RECORD_TYPE
);
5570 TYPE_FIELDS (rt
) = build_decl (FIELD_DECL
, get_identifier ("f"), array
);
5571 DECL_CONTEXT (TYPE_FIELDS (rt
)) = rt
;
5573 TYPE_DEBUG_REPRESENTATION_TYPE (t
) = rt
;
5574 /* In dwarfout.c, type lookup uses TYPE_UID numbers. We want to output
5575 the representation type, and we want to find that die when looking up
5576 the vector type. This is most easily achieved by making the TYPE_UID
5578 TYPE_UID (rt
) = TYPE_UID (t
);
5581 /* Build our main variant, based on the main variant of the inner type. */
5582 if (TYPE_MAIN_VARIANT (innertype
) != innertype
)
5584 tree innertype_main_variant
= TYPE_MAIN_VARIANT (innertype
);
5585 unsigned int hash
= TYPE_HASH (innertype_main_variant
);
5586 TYPE_MAIN_VARIANT (t
)
5587 = type_hash_canon (hash
, make_vector_type (innertype_main_variant
,
5595 make_or_reuse_type (unsigned size
, int unsignedp
)
5597 if (size
== INT_TYPE_SIZE
)
5598 return unsignedp
? unsigned_type_node
: integer_type_node
;
5599 if (size
== CHAR_TYPE_SIZE
)
5600 return unsignedp
? unsigned_char_type_node
: signed_char_type_node
;
5601 if (size
== SHORT_TYPE_SIZE
)
5602 return unsignedp
? short_unsigned_type_node
: short_integer_type_node
;
5603 if (size
== LONG_TYPE_SIZE
)
5604 return unsignedp
? long_unsigned_type_node
: long_integer_type_node
;
5605 if (size
== LONG_LONG_TYPE_SIZE
)
5606 return (unsignedp
? long_long_unsigned_type_node
5607 : long_long_integer_type_node
);
5610 return make_unsigned_type (size
);
5612 return make_signed_type (size
);
5615 /* Create nodes for all integer types (and error_mark_node) using the sizes
5616 of C datatypes. The caller should call set_sizetype soon after calling
5617 this function to select one of the types as sizetype. */
5620 build_common_tree_nodes (bool signed_char
, bool signed_sizetype
)
5622 error_mark_node
= make_node (ERROR_MARK
);
5623 TREE_TYPE (error_mark_node
) = error_mark_node
;
5625 initialize_sizetypes (signed_sizetype
);
5627 /* Define both `signed char' and `unsigned char'. */
5628 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
5629 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
5631 /* Define `char', which is like either `signed char' or `unsigned char'
5632 but not the same as either. */
5635 ? make_signed_type (CHAR_TYPE_SIZE
)
5636 : make_unsigned_type (CHAR_TYPE_SIZE
));
5638 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
5639 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
5640 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
5641 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
5642 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
5643 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
5644 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
5645 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
5647 /* Define a boolean type. This type only represents boolean values but
5648 may be larger than char depending on the value of BOOL_TYPE_SIZE.
5649 Front ends which want to override this size (i.e. Java) can redefine
5650 boolean_type_node before calling build_common_tree_nodes_2. */
5651 boolean_type_node
= make_unsigned_type (BOOL_TYPE_SIZE
);
5652 TREE_SET_CODE (boolean_type_node
, BOOLEAN_TYPE
);
5653 TYPE_MAX_VALUE (boolean_type_node
) = build_int_cst (boolean_type_node
, 1);
5654 TYPE_PRECISION (boolean_type_node
) = 1;
5656 /* Fill in the rest of the sized types. Reuse existing type nodes
5658 intQI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (QImode
), 0);
5659 intHI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (HImode
), 0);
5660 intSI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (SImode
), 0);
5661 intDI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (DImode
), 0);
5662 intTI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (TImode
), 0);
5664 unsigned_intQI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (QImode
), 1);
5665 unsigned_intHI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (HImode
), 1);
5666 unsigned_intSI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (SImode
), 1);
5667 unsigned_intDI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (DImode
), 1);
5668 unsigned_intTI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (TImode
), 1);
5670 access_public_node
= get_identifier ("public");
5671 access_protected_node
= get_identifier ("protected");
5672 access_private_node
= get_identifier ("private");
5675 /* Call this function after calling build_common_tree_nodes and set_sizetype.
5676 It will create several other common tree nodes. */
5679 build_common_tree_nodes_2 (int short_double
)
5681 /* Define these next since types below may used them. */
5682 integer_zero_node
= build_int_cst (NULL_TREE
, 0);
5683 integer_one_node
= build_int_cst (NULL_TREE
, 1);
5684 integer_minus_one_node
= build_int_cst (NULL_TREE
, -1);
5686 size_zero_node
= size_int (0);
5687 size_one_node
= size_int (1);
5688 bitsize_zero_node
= bitsize_int (0);
5689 bitsize_one_node
= bitsize_int (1);
5690 bitsize_unit_node
= bitsize_int (BITS_PER_UNIT
);
5692 boolean_false_node
= TYPE_MIN_VALUE (boolean_type_node
);
5693 boolean_true_node
= TYPE_MAX_VALUE (boolean_type_node
);
5695 void_type_node
= make_node (VOID_TYPE
);
5696 layout_type (void_type_node
);
5698 /* We are not going to have real types in C with less than byte alignment,
5699 so we might as well not have any types that claim to have it. */
5700 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
5701 TYPE_USER_ALIGN (void_type_node
) = 0;
5703 null_pointer_node
= build_int_cst (build_pointer_type (void_type_node
), 0);
5704 layout_type (TREE_TYPE (null_pointer_node
));
5706 ptr_type_node
= build_pointer_type (void_type_node
);
5708 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
5709 fileptr_type_node
= ptr_type_node
;
5711 float_type_node
= make_node (REAL_TYPE
);
5712 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
5713 layout_type (float_type_node
);
5715 double_type_node
= make_node (REAL_TYPE
);
5717 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
5719 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
5720 layout_type (double_type_node
);
5722 long_double_type_node
= make_node (REAL_TYPE
);
5723 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
5724 layout_type (long_double_type_node
);
5726 float_ptr_type_node
= build_pointer_type (float_type_node
);
5727 double_ptr_type_node
= build_pointer_type (double_type_node
);
5728 long_double_ptr_type_node
= build_pointer_type (long_double_type_node
);
5729 integer_ptr_type_node
= build_pointer_type (integer_type_node
);
5731 complex_integer_type_node
= make_node (COMPLEX_TYPE
);
5732 TREE_TYPE (complex_integer_type_node
) = integer_type_node
;
5733 layout_type (complex_integer_type_node
);
5735 complex_float_type_node
= make_node (COMPLEX_TYPE
);
5736 TREE_TYPE (complex_float_type_node
) = float_type_node
;
5737 layout_type (complex_float_type_node
);
5739 complex_double_type_node
= make_node (COMPLEX_TYPE
);
5740 TREE_TYPE (complex_double_type_node
) = double_type_node
;
5741 layout_type (complex_double_type_node
);
5743 complex_long_double_type_node
= make_node (COMPLEX_TYPE
);
5744 TREE_TYPE (complex_long_double_type_node
) = long_double_type_node
;
5745 layout_type (complex_long_double_type_node
);
5748 tree t
= targetm
.build_builtin_va_list ();
5750 /* Many back-ends define record types without setting TYPE_NAME.
5751 If we copied the record type here, we'd keep the original
5752 record type without a name. This breaks name mangling. So,
5753 don't copy record types and let c_common_nodes_and_builtins()
5754 declare the type to be __builtin_va_list. */
5755 if (TREE_CODE (t
) != RECORD_TYPE
)
5756 t
= build_variant_type_copy (t
);
5758 va_list_type_node
= t
;
5762 /* HACK. GROSS. This is absolutely disgusting. I wish there was a
5765 If we requested a pointer to a vector, build up the pointers that
5766 we stripped off while looking for the inner type. Similarly for
5767 return values from functions.
5769 The argument TYPE is the top of the chain, and BOTTOM is the
5770 new type which we will point to. */
5773 reconstruct_complex_type (tree type
, tree bottom
)
5777 if (POINTER_TYPE_P (type
))
5779 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5780 outer
= build_pointer_type (inner
);
5782 else if (TREE_CODE (type
) == ARRAY_TYPE
)
5784 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5785 outer
= build_array_type (inner
, TYPE_DOMAIN (type
));
5787 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5789 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5790 outer
= build_function_type (inner
, TYPE_ARG_TYPES (type
));
5792 else if (TREE_CODE (type
) == METHOD_TYPE
)
5795 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5796 /* The build_method_type_directly() routine prepends 'this' to argument list,
5797 so we must compensate by getting rid of it. */
5798 argtypes
= TYPE_ARG_TYPES (type
);
5799 outer
= build_method_type_directly (TYPE_METHOD_BASETYPE (type
),
5801 TYPE_ARG_TYPES (type
));
5802 TYPE_ARG_TYPES (outer
) = argtypes
;
5807 TYPE_READONLY (outer
) = TYPE_READONLY (type
);
5808 TYPE_VOLATILE (outer
) = TYPE_VOLATILE (type
);
5813 /* Returns a vector tree node given a mode (integer, vector, or BLKmode) and
5816 build_vector_type_for_mode (tree innertype
, enum machine_mode mode
)
5820 switch (GET_MODE_CLASS (mode
))
5822 case MODE_VECTOR_INT
:
5823 case MODE_VECTOR_FLOAT
:
5824 nunits
= GET_MODE_NUNITS (mode
);
5828 /* Check that there are no leftover bits. */
5829 gcc_assert (GET_MODE_BITSIZE (mode
)
5830 % TREE_INT_CST_LOW (TYPE_SIZE (innertype
)) == 0);
5832 nunits
= GET_MODE_BITSIZE (mode
)
5833 / TREE_INT_CST_LOW (TYPE_SIZE (innertype
));
5840 return make_vector_type (innertype
, nunits
, mode
);
5843 /* Similarly, but takes the inner type and number of units, which must be
5847 build_vector_type (tree innertype
, int nunits
)
5849 return make_vector_type (innertype
, nunits
, VOIDmode
);
5852 /* Given an initializer INIT, return TRUE if INIT is zero or some
5853 aggregate of zeros. Otherwise return FALSE. */
5855 initializer_zerop (tree init
)
5861 switch (TREE_CODE (init
))
5864 return integer_zerop (init
);
5867 /* ??? Note that this is not correct for C4X float formats. There,
5868 a bit pattern of all zeros is 1.0; 0.0 is encoded with the most
5869 negative exponent. */
5870 return real_zerop (init
)
5871 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (init
));
5874 return integer_zerop (init
)
5875 || (real_zerop (init
)
5876 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_REALPART (init
)))
5877 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_IMAGPART (init
))));
5880 for (elt
= TREE_VECTOR_CST_ELTS (init
); elt
; elt
= TREE_CHAIN (elt
))
5881 if (!initializer_zerop (TREE_VALUE (elt
)))
5886 elt
= CONSTRUCTOR_ELTS (init
);
5887 if (elt
== NULL_TREE
)
5890 for (; elt
; elt
= TREE_CHAIN (elt
))
5891 if (! initializer_zerop (TREE_VALUE (elt
)))
5901 add_var_to_bind_expr (tree bind_expr
, tree var
)
5903 BIND_EXPR_VARS (bind_expr
)
5904 = chainon (BIND_EXPR_VARS (bind_expr
), var
);
5905 if (BIND_EXPR_BLOCK (bind_expr
))
5906 BLOCK_VARS (BIND_EXPR_BLOCK (bind_expr
))
5907 = BIND_EXPR_VARS (bind_expr
);
5910 /* Build an empty statement. */
5913 build_empty_stmt (void)
5915 return build1 (NOP_EXPR
, void_type_node
, size_zero_node
);
5919 /* Returns true if it is possible to prove that the index of
5920 an array access REF (an ARRAY_REF expression) falls into the
5924 in_array_bounds_p (tree ref
)
5926 tree idx
= TREE_OPERAND (ref
, 1);
5929 if (TREE_CODE (idx
) != INTEGER_CST
)
5932 min
= array_ref_low_bound (ref
);
5933 max
= array_ref_up_bound (ref
);
5936 || TREE_CODE (min
) != INTEGER_CST
5937 || TREE_CODE (max
) != INTEGER_CST
)
5940 if (tree_int_cst_lt (idx
, min
)
5941 || tree_int_cst_lt (max
, idx
))
5947 /* Return true if T (assumed to be a DECL) is a global variable. */
5950 is_global_var (tree t
)
5952 return (TREE_STATIC (t
) || DECL_EXTERNAL (t
));
5955 /* Return true if T (assumed to be a DECL) must be assigned a memory
5959 needs_to_live_in_memory (tree t
)
5961 return (TREE_ADDRESSABLE (t
)
5962 || is_global_var (t
)
5963 || (TREE_CODE (t
) == RESULT_DECL
5964 && aggregate_value_p (t
, current_function_decl
)));
5967 /* There are situations in which a language considers record types
5968 compatible which have different field lists. Decide if two fields
5969 are compatible. It is assumed that the parent records are compatible. */
5972 fields_compatible_p (tree f1
, tree f2
)
5974 if (!operand_equal_p (DECL_FIELD_BIT_OFFSET (f1
),
5975 DECL_FIELD_BIT_OFFSET (f2
), OEP_ONLY_CONST
))
5978 if (!operand_equal_p (DECL_FIELD_OFFSET (f1
),
5979 DECL_FIELD_OFFSET (f2
), OEP_ONLY_CONST
))
5982 if (!lang_hooks
.types_compatible_p (TREE_TYPE (f1
), TREE_TYPE (f2
)))
5988 /* Locate within RECORD a field that is compatible with ORIG_FIELD. */
5991 find_compatible_field (tree record
, tree orig_field
)
5995 for (f
= TYPE_FIELDS (record
); f
; f
= TREE_CHAIN (f
))
5996 if (TREE_CODE (f
) == FIELD_DECL
5997 && fields_compatible_p (f
, orig_field
))
6000 /* ??? Why isn't this on the main fields list? */
6001 f
= TYPE_VFIELD (record
);
6002 if (f
&& TREE_CODE (f
) == FIELD_DECL
6003 && fields_compatible_p (f
, orig_field
))
6006 /* ??? We should abort here, but Java appears to do Bad Things
6007 with inherited fields. */
6011 /* Return value of a constant X. */
6014 int_cst_value (tree x
)
6016 unsigned bits
= TYPE_PRECISION (TREE_TYPE (x
));
6017 unsigned HOST_WIDE_INT val
= TREE_INT_CST_LOW (x
);
6018 bool negative
= ((val
>> (bits
- 1)) & 1) != 0;
6020 gcc_assert (bits
<= HOST_BITS_PER_WIDE_INT
);
6023 val
|= (~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1) << 1;
6025 val
&= ~((~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1) << 1);
6030 /* Returns the greatest common divisor of A and B, which must be
6034 tree_fold_gcd (tree a
, tree b
)
6037 tree type
= TREE_TYPE (a
);
6039 gcc_assert (TREE_CODE (a
) == INTEGER_CST
);
6040 gcc_assert (TREE_CODE (b
) == INTEGER_CST
);
6042 if (integer_zerop (a
))
6045 if (integer_zerop (b
))
6048 if (tree_int_cst_sgn (a
) == -1)
6049 a
= fold (build2 (MULT_EXPR
, type
, a
,
6050 convert (type
, integer_minus_one_node
)));
6052 if (tree_int_cst_sgn (b
) == -1)
6053 b
= fold (build2 (MULT_EXPR
, type
, b
,
6054 convert (type
, integer_minus_one_node
)));
6058 a_mod_b
= fold (build2 (FLOOR_MOD_EXPR
, type
, a
, b
));
6060 if (!TREE_INT_CST_LOW (a_mod_b
)
6061 && !TREE_INT_CST_HIGH (a_mod_b
))
6069 /* Returns unsigned variant of TYPE. */
6072 unsigned_type_for (tree type
)
6074 return lang_hooks
.types
.unsigned_type (type
);
6077 /* Returns signed variant of TYPE. */
6080 signed_type_for (tree type
)
6082 return lang_hooks
.types
.signed_type (type
);
6085 /* Returns the largest value obtainable by casting something in INNER type to
6089 upper_bound_in_type (tree outer
, tree inner
)
6091 unsigned HOST_WIDE_INT lo
, hi
;
6092 unsigned bits
= TYPE_PRECISION (inner
);
6094 if (TYPE_UNSIGNED (outer
) || TYPE_UNSIGNED (inner
))
6096 /* Zero extending in these cases. */
6097 if (bits
<= HOST_BITS_PER_WIDE_INT
)
6100 lo
= (~(unsigned HOST_WIDE_INT
) 0)
6101 >> (HOST_BITS_PER_WIDE_INT
- bits
);
6105 hi
= (~(unsigned HOST_WIDE_INT
) 0)
6106 >> (2 * HOST_BITS_PER_WIDE_INT
- bits
);
6107 lo
= ~(unsigned HOST_WIDE_INT
) 0;
6112 /* Sign extending in these cases. */
6113 if (bits
<= HOST_BITS_PER_WIDE_INT
)
6116 lo
= (~(unsigned HOST_WIDE_INT
) 0)
6117 >> (HOST_BITS_PER_WIDE_INT
- bits
) >> 1;
6121 hi
= (~(unsigned HOST_WIDE_INT
) 0)
6122 >> (2 * HOST_BITS_PER_WIDE_INT
- bits
) >> 1;
6123 lo
= ~(unsigned HOST_WIDE_INT
) 0;
6127 return fold_convert (outer
,
6128 build_int_cst_wide (inner
, lo
, hi
));
6131 /* Returns the smallest value obtainable by casting something in INNER type to
6135 lower_bound_in_type (tree outer
, tree inner
)
6137 unsigned HOST_WIDE_INT lo
, hi
;
6138 unsigned bits
= TYPE_PRECISION (inner
);
6140 if (TYPE_UNSIGNED (outer
) || TYPE_UNSIGNED (inner
))
6142 else if (bits
<= HOST_BITS_PER_WIDE_INT
)
6144 hi
= ~(unsigned HOST_WIDE_INT
) 0;
6145 lo
= (~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1);
6149 hi
= (~(unsigned HOST_WIDE_INT
) 0) << (bits
- HOST_BITS_PER_WIDE_INT
- 1);
6153 return fold_convert (outer
,
6154 build_int_cst_wide (inner
, lo
, hi
));
6157 /* Return nonzero if two operands that are suitable for PHI nodes are
6158 necessarily equal. Specifically, both ARG0 and ARG1 must be either
6159 SSA_NAME or invariant. Note that this is strictly an optimization.
6160 That is, callers of this function can directly call operand_equal_p
6161 and get the same result, only slower. */
6164 operand_equal_for_phi_arg_p (tree arg0
, tree arg1
)
6168 if (TREE_CODE (arg0
) == SSA_NAME
|| TREE_CODE (arg1
) == SSA_NAME
)
6170 return operand_equal_p (arg0
, arg1
, 0);
6173 #include "gt-tree.h"