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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* This file contains the low level primitives for operating on tree nodes,
23 including allocation, list operations, interning of identifiers,
24 construction of data type nodes and statement nodes,
25 and construction of type conversion nodes. It also contains
26 tables index by tree code that describe how to take apart
29 It is intended to be language-independent, but occasionally
30 calls language-dependent routines defined (for C) in typecheck.c. */
34 #include "coretypes.h"
47 #include "langhooks.h"
48 #include "tree-iterator.h"
49 #include "basic-block.h"
50 #include "tree-flow.h"
52 /* obstack.[ch] explicitly declined to prototype this. */
53 extern int _obstack_allocated_p (struct obstack
*h
, void *obj
);
55 #ifdef GATHER_STATISTICS
56 /* Statistics-gathering stuff. */
58 int tree_node_counts
[(int) all_kinds
];
59 int tree_node_sizes
[(int) all_kinds
];
61 /* Keep in sync with tree.h:enum tree_node_kind. */
62 static const char * const tree_node_kind_names
[] = {
81 #endif /* GATHER_STATISTICS */
83 /* Unique id for next decl created. */
84 static GTY(()) int next_decl_uid
;
85 /* Unique id for next type created. */
86 static GTY(()) int next_type_uid
= 1;
88 /* Since we cannot rehash a type after it is in the table, we have to
89 keep the hash code. */
91 struct type_hash
GTY(())
97 /* Initial size of the hash table (rounded to next prime). */
98 #define TYPE_HASH_INITIAL_SIZE 1000
100 /* Now here is the hash table. When recording a type, it is added to
101 the slot whose index is the hash code. Note that the hash table is
102 used for several kinds of types (function types, array types and
103 array index range types, for now). While all these live in the
104 same table, they are completely independent, and the hash code is
105 computed differently for each of these. */
107 static GTY ((if_marked ("type_hash_marked_p"), param_is (struct type_hash
)))
108 htab_t type_hash_table
;
110 static void set_type_quals (tree
, int);
111 static int type_hash_eq (const void *, const void *);
112 static hashval_t
type_hash_hash (const void *);
113 static void print_type_hash_statistics (void);
114 static tree
make_vector_type (tree
, int, enum machine_mode
);
115 static int type_hash_marked_p (const void *);
116 static unsigned int type_hash_list (tree
, hashval_t
);
117 static unsigned int attribute_hash_list (tree
, hashval_t
);
119 tree global_trees
[TI_MAX
];
120 tree integer_types
[itk_none
];
127 /* Initialize the hash table of types. */
128 type_hash_table
= htab_create_ggc (TYPE_HASH_INITIAL_SIZE
, type_hash_hash
,
133 /* The name of the object as the assembler will see it (but before any
134 translations made by ASM_OUTPUT_LABELREF). Often this is the same
135 as DECL_NAME. It is an IDENTIFIER_NODE. */
137 decl_assembler_name (tree decl
)
139 if (!DECL_ASSEMBLER_NAME_SET_P (decl
))
140 lang_hooks
.set_decl_assembler_name (decl
);
141 return DECL_CHECK (decl
)->decl
.assembler_name
;
144 /* Compute the number of bytes occupied by 'node'. This routine only
145 looks at TREE_CODE and, if the code is TREE_VEC, TREE_VEC_LENGTH. */
147 tree_size (tree node
)
149 enum tree_code code
= TREE_CODE (node
);
151 switch (TREE_CODE_CLASS (code
))
153 case 'd': /* A decl node */
154 return sizeof (struct tree_decl
);
156 case 't': /* a type node */
157 return sizeof (struct tree_type
);
159 case 'r': /* a reference */
160 case 'e': /* an expression */
161 case 's': /* an expression with side effects */
162 case '<': /* a comparison expression */
163 case '1': /* a unary arithmetic expression */
164 case '2': /* a binary arithmetic expression */
165 return (sizeof (struct tree_exp
)
166 + TREE_CODE_LENGTH (code
) * sizeof (char *) - sizeof (char *));
168 case 'c': /* a constant */
171 case INTEGER_CST
: return sizeof (struct tree_int_cst
);
172 case REAL_CST
: return sizeof (struct tree_real_cst
);
173 case COMPLEX_CST
: return sizeof (struct tree_complex
);
174 case VECTOR_CST
: return sizeof (struct tree_vector
);
175 case STRING_CST
: return sizeof (struct tree_string
);
177 return lang_hooks
.tree_size (code
);
180 case 'x': /* something random, like an identifier. */
183 case IDENTIFIER_NODE
: return lang_hooks
.identifier_size
;
184 case TREE_LIST
: return sizeof (struct tree_list
);
185 case TREE_VEC
: return (sizeof (struct tree_vec
)
186 + TREE_VEC_LENGTH(node
) * sizeof(char *)
190 case PLACEHOLDER_EXPR
: return sizeof (struct tree_common
);
192 case PHI_NODE
: return (sizeof (struct tree_phi_node
)
193 + (PHI_ARG_CAPACITY (node
) - 1) *
194 sizeof (struct phi_arg_d
));
196 case SSA_NAME
: return sizeof (struct tree_ssa_name
);
198 case STATEMENT_LIST
: return sizeof (struct tree_statement_list
);
199 case BLOCK
: return sizeof (struct tree_block
);
200 case VALUE_HANDLE
: return sizeof (struct tree_value_handle
);
203 return lang_hooks
.tree_size (code
);
211 /* Return a newly allocated node of code CODE.
212 For decl and type nodes, some other fields are initialized.
213 The rest of the node is initialized to zero.
215 Achoo! I got a code in the node. */
218 make_node_stat (enum tree_code code MEM_STAT_DECL
)
221 int type
= TREE_CODE_CLASS (code
);
223 #ifdef GATHER_STATISTICS
226 struct tree_common ttmp
;
228 /* We can't allocate a TREE_VEC, PHI_NODE, or STRING_CST
229 without knowing how many elements it will have. */
230 if (code
== TREE_VEC
|| code
== PHI_NODE
)
233 TREE_SET_CODE ((tree
)&ttmp
, code
);
234 length
= tree_size ((tree
)&ttmp
);
236 #ifdef GATHER_STATISTICS
239 case 'd': /* A decl node */
243 case 't': /* a type node */
247 case 's': /* an expression with side effects */
251 case 'r': /* a reference */
255 case 'e': /* an expression */
256 case '<': /* a comparison expression */
257 case '1': /* a unary arithmetic expression */
258 case '2': /* a binary arithmetic expression */
262 case 'c': /* a constant */
266 case 'x': /* something random, like an identifier. */
267 if (code
== IDENTIFIER_NODE
)
269 else if (code
== TREE_VEC
)
271 else if (code
== TREE_BINFO
)
273 else if (code
== PHI_NODE
)
275 else if (code
== SSA_NAME
)
276 kind
= ssa_name_kind
;
277 else if (code
== BLOCK
)
287 tree_node_counts
[(int) kind
]++;
288 tree_node_sizes
[(int) kind
] += length
;
291 t
= ggc_alloc_zone_stat (length
, tree_zone PASS_MEM_STAT
);
293 memset (t
, 0, length
);
295 TREE_SET_CODE (t
, code
);
300 TREE_SIDE_EFFECTS (t
) = 1;
304 if (code
!= FUNCTION_DECL
)
306 DECL_USER_ALIGN (t
) = 0;
307 DECL_IN_SYSTEM_HEADER (t
) = in_system_header
;
308 DECL_SOURCE_LOCATION (t
) = input_location
;
309 DECL_UID (t
) = next_decl_uid
++;
311 /* We have not yet computed the alias set for this declaration. */
312 DECL_POINTER_ALIAS_SET (t
) = -1;
316 TYPE_UID (t
) = next_type_uid
++;
317 TYPE_ALIGN (t
) = char_type_node
? TYPE_ALIGN (char_type_node
) : 0;
318 TYPE_USER_ALIGN (t
) = 0;
319 TYPE_MAIN_VARIANT (t
) = t
;
321 /* Default to no attributes for type, but let target change that. */
322 TYPE_ATTRIBUTES (t
) = NULL_TREE
;
323 targetm
.set_default_type_attributes (t
);
325 /* We have not yet computed the alias set for this type. */
326 TYPE_ALIAS_SET (t
) = -1;
330 TREE_CONSTANT (t
) = 1;
331 TREE_INVARIANT (t
) = 1;
340 case PREDECREMENT_EXPR
:
341 case PREINCREMENT_EXPR
:
342 case POSTDECREMENT_EXPR
:
343 case POSTINCREMENT_EXPR
:
344 /* All of these have side-effects, no matter what their
346 TREE_SIDE_EFFECTS (t
) = 1;
358 /* Return a new node with the same contents as NODE except that its
359 TREE_CHAIN is zero and it has a fresh uid. */
362 copy_node_stat (tree node MEM_STAT_DECL
)
365 enum tree_code code
= TREE_CODE (node
);
368 #ifdef ENABLE_CHECKING
369 if (code
== STATEMENT_LIST
)
373 length
= tree_size (node
);
374 t
= ggc_alloc_zone_stat (length
, tree_zone PASS_MEM_STAT
);
375 memcpy (t
, node
, length
);
378 TREE_ASM_WRITTEN (t
) = 0;
379 TREE_VISITED (t
) = 0;
382 if (TREE_CODE_CLASS (code
) == 'd')
383 DECL_UID (t
) = next_decl_uid
++;
384 else if (TREE_CODE_CLASS (code
) == 't')
386 TYPE_UID (t
) = next_type_uid
++;
387 /* The following is so that the debug code for
388 the copy is different from the original type.
389 The two statements usually duplicate each other
390 (because they clear fields of the same union),
391 but the optimizer should catch that. */
392 TYPE_SYMTAB_POINTER (t
) = 0;
393 TYPE_SYMTAB_ADDRESS (t
) = 0;
399 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
400 For example, this can copy a list made of TREE_LIST nodes. */
403 copy_list (tree list
)
411 head
= prev
= copy_node (list
);
412 next
= TREE_CHAIN (list
);
415 TREE_CHAIN (prev
) = copy_node (next
);
416 prev
= TREE_CHAIN (prev
);
417 next
= TREE_CHAIN (next
);
423 /* Return a newly constructed INTEGER_CST node whose constant value
424 is specified by the two ints LOW and HI.
425 The TREE_TYPE is set to `int'. */
428 build_int_2 (unsigned HOST_WIDE_INT low
, HOST_WIDE_INT hi
)
430 tree t
= make_node (INTEGER_CST
);
432 TREE_INT_CST_LOW (t
) = low
;
433 TREE_INT_CST_HIGH (t
) = hi
;
434 TREE_TYPE (t
) = integer_type_node
;
438 /* Return a new VECTOR_CST node whose type is TYPE and whose values
439 are in a list pointed by VALS. */
442 build_vector (tree type
, tree vals
)
444 tree v
= make_node (VECTOR_CST
);
445 int over1
= 0, over2
= 0;
448 TREE_VECTOR_CST_ELTS (v
) = vals
;
449 TREE_TYPE (v
) = type
;
451 /* Iterate through elements and check for overflow. */
452 for (link
= vals
; link
; link
= TREE_CHAIN (link
))
454 tree value
= TREE_VALUE (link
);
456 over1
|= TREE_OVERFLOW (value
);
457 over2
|= TREE_CONSTANT_OVERFLOW (value
);
460 TREE_OVERFLOW (v
) = over1
;
461 TREE_CONSTANT_OVERFLOW (v
) = over2
;
466 /* Return a new CONSTRUCTOR node whose type is TYPE and whose values
467 are in a list pointed to by VALS. */
469 build_constructor (tree type
, tree vals
)
471 tree c
= make_node (CONSTRUCTOR
);
472 TREE_TYPE (c
) = type
;
473 CONSTRUCTOR_ELTS (c
) = vals
;
475 /* ??? May not be necessary. Mirrors what build does. */
478 TREE_SIDE_EFFECTS (c
) = TREE_SIDE_EFFECTS (vals
);
479 TREE_READONLY (c
) = TREE_READONLY (vals
);
480 TREE_CONSTANT (c
) = TREE_CONSTANT (vals
);
481 TREE_INVARIANT (c
) = TREE_INVARIANT (vals
);
487 /* Return a new REAL_CST node whose type is TYPE and value is D. */
490 build_real (tree type
, REAL_VALUE_TYPE d
)
496 /* ??? Used to check for overflow here via CHECK_FLOAT_TYPE.
497 Consider doing it via real_convert now. */
499 v
= make_node (REAL_CST
);
500 dp
= ggc_alloc (sizeof (REAL_VALUE_TYPE
));
501 memcpy (dp
, &d
, sizeof (REAL_VALUE_TYPE
));
503 TREE_TYPE (v
) = type
;
504 TREE_REAL_CST_PTR (v
) = dp
;
505 TREE_OVERFLOW (v
) = TREE_CONSTANT_OVERFLOW (v
) = overflow
;
509 /* Return a new REAL_CST node whose type is TYPE
510 and whose value is the integer value of the INTEGER_CST node I. */
513 real_value_from_int_cst (tree type
, tree i
)
517 /* Clear all bits of the real value type so that we can later do
518 bitwise comparisons to see if two values are the same. */
519 memset (&d
, 0, sizeof d
);
521 real_from_integer (&d
, type
? TYPE_MODE (type
) : VOIDmode
,
522 TREE_INT_CST_LOW (i
), TREE_INT_CST_HIGH (i
),
523 TYPE_UNSIGNED (TREE_TYPE (i
)));
527 /* Given a tree representing an integer constant I, return a tree
528 representing the same value as a floating-point constant of type TYPE. */
531 build_real_from_int_cst (tree type
, tree i
)
534 int overflow
= TREE_OVERFLOW (i
);
536 v
= build_real (type
, real_value_from_int_cst (type
, i
));
538 TREE_OVERFLOW (v
) |= overflow
;
539 TREE_CONSTANT_OVERFLOW (v
) |= overflow
;
543 /* Return a newly constructed STRING_CST node whose value is
544 the LEN characters at STR.
545 The TREE_TYPE is not initialized. */
548 build_string (int len
, const char *str
)
550 tree s
= make_node (STRING_CST
);
552 TREE_STRING_LENGTH (s
) = len
;
553 TREE_STRING_POINTER (s
) = ggc_alloc_string (str
, len
);
558 /* Return a newly constructed COMPLEX_CST node whose value is
559 specified by the real and imaginary parts REAL and IMAG.
560 Both REAL and IMAG should be constant nodes. TYPE, if specified,
561 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
564 build_complex (tree type
, tree real
, tree imag
)
566 tree t
= make_node (COMPLEX_CST
);
568 TREE_REALPART (t
) = real
;
569 TREE_IMAGPART (t
) = imag
;
570 TREE_TYPE (t
) = type
? type
: build_complex_type (TREE_TYPE (real
));
571 TREE_OVERFLOW (t
) = TREE_OVERFLOW (real
) | TREE_OVERFLOW (imag
);
572 TREE_CONSTANT_OVERFLOW (t
)
573 = TREE_CONSTANT_OVERFLOW (real
) | TREE_CONSTANT_OVERFLOW (imag
);
577 /* Build a BINFO with LEN language slots. */
580 make_tree_binfo_stat (unsigned base_binfos MEM_STAT_DECL
)
583 size_t length
= (offsetof (struct tree_binfo
, base_binfos
)
584 + VEC_embedded_size (tree
, base_binfos
));
586 #ifdef GATHER_STATISTICS
587 tree_node_counts
[(int) binfo_kind
]++;
588 tree_node_sizes
[(int) binfo_kind
] += length
;
591 t
= ggc_alloc_zone_stat (length
, tree_zone PASS_MEM_STAT
);
593 memset (t
, 0, offsetof (struct tree_binfo
, base_binfos
));
595 TREE_SET_CODE (t
, TREE_BINFO
);
597 VEC_embedded_init (tree
, BINFO_BASE_BINFOS (t
), base_binfos
);
603 /* Build a newly constructed TREE_VEC node of length LEN. */
606 make_tree_vec_stat (int len MEM_STAT_DECL
)
609 int length
= (len
- 1) * sizeof (tree
) + sizeof (struct tree_vec
);
611 #ifdef GATHER_STATISTICS
612 tree_node_counts
[(int) vec_kind
]++;
613 tree_node_sizes
[(int) vec_kind
] += length
;
616 t
= ggc_alloc_zone_stat (length
, tree_zone PASS_MEM_STAT
);
618 memset (t
, 0, length
);
620 TREE_SET_CODE (t
, TREE_VEC
);
621 TREE_VEC_LENGTH (t
) = len
;
626 /* Return 1 if EXPR is the integer constant zero or a complex constant
630 integer_zerop (tree expr
)
634 return ((TREE_CODE (expr
) == INTEGER_CST
635 && ! TREE_CONSTANT_OVERFLOW (expr
)
636 && TREE_INT_CST_LOW (expr
) == 0
637 && TREE_INT_CST_HIGH (expr
) == 0)
638 || (TREE_CODE (expr
) == COMPLEX_CST
639 && integer_zerop (TREE_REALPART (expr
))
640 && integer_zerop (TREE_IMAGPART (expr
))));
643 /* Return 1 if EXPR is the integer constant one or the corresponding
647 integer_onep (tree expr
)
651 return ((TREE_CODE (expr
) == INTEGER_CST
652 && ! TREE_CONSTANT_OVERFLOW (expr
)
653 && TREE_INT_CST_LOW (expr
) == 1
654 && TREE_INT_CST_HIGH (expr
) == 0)
655 || (TREE_CODE (expr
) == COMPLEX_CST
656 && integer_onep (TREE_REALPART (expr
))
657 && integer_zerop (TREE_IMAGPART (expr
))));
660 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
661 it contains. Likewise for the corresponding complex constant. */
664 integer_all_onesp (tree expr
)
671 if (TREE_CODE (expr
) == COMPLEX_CST
672 && integer_all_onesp (TREE_REALPART (expr
))
673 && integer_zerop (TREE_IMAGPART (expr
)))
676 else if (TREE_CODE (expr
) != INTEGER_CST
677 || TREE_CONSTANT_OVERFLOW (expr
))
680 uns
= TYPE_UNSIGNED (TREE_TYPE (expr
));
682 return (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
683 && TREE_INT_CST_HIGH (expr
) == -1);
685 /* Note that using TYPE_PRECISION here is wrong. We care about the
686 actual bits, not the (arbitrary) range of the type. */
687 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr
)));
688 if (prec
>= HOST_BITS_PER_WIDE_INT
)
690 HOST_WIDE_INT high_value
;
693 shift_amount
= prec
- HOST_BITS_PER_WIDE_INT
;
695 if (shift_amount
> HOST_BITS_PER_WIDE_INT
)
696 /* Can not handle precisions greater than twice the host int size. */
698 else if (shift_amount
== HOST_BITS_PER_WIDE_INT
)
699 /* Shifting by the host word size is undefined according to the ANSI
700 standard, so we must handle this as a special case. */
703 high_value
= ((HOST_WIDE_INT
) 1 << shift_amount
) - 1;
705 return (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
706 && TREE_INT_CST_HIGH (expr
) == high_value
);
709 return TREE_INT_CST_LOW (expr
) == ((unsigned HOST_WIDE_INT
) 1 << prec
) - 1;
712 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
716 integer_pow2p (tree expr
)
719 HOST_WIDE_INT high
, low
;
723 if (TREE_CODE (expr
) == COMPLEX_CST
724 && integer_pow2p (TREE_REALPART (expr
))
725 && integer_zerop (TREE_IMAGPART (expr
)))
728 if (TREE_CODE (expr
) != INTEGER_CST
|| TREE_CONSTANT_OVERFLOW (expr
))
731 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
732 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
733 high
= TREE_INT_CST_HIGH (expr
);
734 low
= TREE_INT_CST_LOW (expr
);
736 /* First clear all bits that are beyond the type's precision in case
737 we've been sign extended. */
739 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
741 else if (prec
> HOST_BITS_PER_WIDE_INT
)
742 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
746 if (prec
< HOST_BITS_PER_WIDE_INT
)
747 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
750 if (high
== 0 && low
== 0)
753 return ((high
== 0 && (low
& (low
- 1)) == 0)
754 || (low
== 0 && (high
& (high
- 1)) == 0));
757 /* Return 1 if EXPR is an integer constant other than zero or a
758 complex constant other than zero. */
761 integer_nonzerop (tree expr
)
765 return ((TREE_CODE (expr
) == INTEGER_CST
766 && ! TREE_CONSTANT_OVERFLOW (expr
)
767 && (TREE_INT_CST_LOW (expr
) != 0
768 || TREE_INT_CST_HIGH (expr
) != 0))
769 || (TREE_CODE (expr
) == COMPLEX_CST
770 && (integer_nonzerop (TREE_REALPART (expr
))
771 || integer_nonzerop (TREE_IMAGPART (expr
)))));
774 /* Return the power of two represented by a tree node known to be a
778 tree_log2 (tree expr
)
781 HOST_WIDE_INT high
, low
;
785 if (TREE_CODE (expr
) == COMPLEX_CST
)
786 return tree_log2 (TREE_REALPART (expr
));
788 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
789 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
791 high
= TREE_INT_CST_HIGH (expr
);
792 low
= TREE_INT_CST_LOW (expr
);
794 /* First clear all bits that are beyond the type's precision in case
795 we've been sign extended. */
797 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
799 else if (prec
> HOST_BITS_PER_WIDE_INT
)
800 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
804 if (prec
< HOST_BITS_PER_WIDE_INT
)
805 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
808 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ exact_log2 (high
)
812 /* Similar, but return the largest integer Y such that 2 ** Y is less
813 than or equal to EXPR. */
816 tree_floor_log2 (tree expr
)
819 HOST_WIDE_INT high
, low
;
823 if (TREE_CODE (expr
) == COMPLEX_CST
)
824 return tree_log2 (TREE_REALPART (expr
));
826 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
827 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
829 high
= TREE_INT_CST_HIGH (expr
);
830 low
= TREE_INT_CST_LOW (expr
);
832 /* First clear all bits that are beyond the type's precision in case
833 we've been sign extended. Ignore if type's precision hasn't been set
834 since what we are doing is setting it. */
836 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
|| prec
== 0)
838 else if (prec
> HOST_BITS_PER_WIDE_INT
)
839 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
843 if (prec
< HOST_BITS_PER_WIDE_INT
)
844 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
847 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ floor_log2 (high
)
851 /* Return 1 if EXPR is the real constant zero. */
854 real_zerop (tree expr
)
858 return ((TREE_CODE (expr
) == REAL_CST
859 && ! TREE_CONSTANT_OVERFLOW (expr
)
860 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst0
))
861 || (TREE_CODE (expr
) == COMPLEX_CST
862 && real_zerop (TREE_REALPART (expr
))
863 && real_zerop (TREE_IMAGPART (expr
))));
866 /* Return 1 if EXPR is the real constant one in real or complex form. */
869 real_onep (tree expr
)
873 return ((TREE_CODE (expr
) == REAL_CST
874 && ! TREE_CONSTANT_OVERFLOW (expr
)
875 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst1
))
876 || (TREE_CODE (expr
) == COMPLEX_CST
877 && real_onep (TREE_REALPART (expr
))
878 && real_zerop (TREE_IMAGPART (expr
))));
881 /* Return 1 if EXPR is the real constant two. */
884 real_twop (tree expr
)
888 return ((TREE_CODE (expr
) == REAL_CST
889 && ! TREE_CONSTANT_OVERFLOW (expr
)
890 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst2
))
891 || (TREE_CODE (expr
) == COMPLEX_CST
892 && real_twop (TREE_REALPART (expr
))
893 && real_zerop (TREE_IMAGPART (expr
))));
896 /* Return 1 if EXPR is the real constant minus one. */
899 real_minus_onep (tree expr
)
903 return ((TREE_CODE (expr
) == REAL_CST
904 && ! TREE_CONSTANT_OVERFLOW (expr
)
905 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconstm1
))
906 || (TREE_CODE (expr
) == COMPLEX_CST
907 && real_minus_onep (TREE_REALPART (expr
))
908 && real_zerop (TREE_IMAGPART (expr
))));
911 /* Nonzero if EXP is a constant or a cast of a constant. */
914 really_constant_p (tree exp
)
916 /* This is not quite the same as STRIP_NOPS. It does more. */
917 while (TREE_CODE (exp
) == NOP_EXPR
918 || TREE_CODE (exp
) == CONVERT_EXPR
919 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
920 exp
= TREE_OPERAND (exp
, 0);
921 return TREE_CONSTANT (exp
);
924 /* Return first list element whose TREE_VALUE is ELEM.
925 Return 0 if ELEM is not in LIST. */
928 value_member (tree elem
, tree list
)
932 if (elem
== TREE_VALUE (list
))
934 list
= TREE_CHAIN (list
);
939 /* Return first list element whose TREE_PURPOSE is ELEM.
940 Return 0 if ELEM is not in LIST. */
943 purpose_member (tree elem
, tree list
)
947 if (elem
== TREE_PURPOSE (list
))
949 list
= TREE_CHAIN (list
);
954 /* Return nonzero if ELEM is part of the chain CHAIN. */
957 chain_member (tree elem
, tree chain
)
963 chain
= TREE_CHAIN (chain
);
969 /* Return the length of a chain of nodes chained through TREE_CHAIN.
970 We expect a null pointer to mark the end of the chain.
971 This is the Lisp primitive `length'. */
977 #ifdef ENABLE_TREE_CHECKING
985 #ifdef ENABLE_TREE_CHECKING
997 /* Returns the number of FIELD_DECLs in TYPE. */
1000 fields_length (tree type
)
1002 tree t
= TYPE_FIELDS (type
);
1005 for (; t
; t
= TREE_CHAIN (t
))
1006 if (TREE_CODE (t
) == FIELD_DECL
)
1012 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
1013 by modifying the last node in chain 1 to point to chain 2.
1014 This is the Lisp primitive `nconc'. */
1017 chainon (tree op1
, tree op2
)
1026 for (t1
= op1
; TREE_CHAIN (t1
); t1
= TREE_CHAIN (t1
))
1028 TREE_CHAIN (t1
) = op2
;
1030 #ifdef ENABLE_TREE_CHECKING
1033 for (t2
= op2
; t2
; t2
= TREE_CHAIN (t2
))
1035 abort (); /* Circularity created. */
1042 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
1045 tree_last (tree chain
)
1049 while ((next
= TREE_CHAIN (chain
)))
1054 /* Reverse the order of elements in the chain T,
1055 and return the new head of the chain (old last element). */
1060 tree prev
= 0, decl
, next
;
1061 for (decl
= t
; decl
; decl
= next
)
1063 next
= TREE_CHAIN (decl
);
1064 TREE_CHAIN (decl
) = prev
;
1070 /* Return a newly created TREE_LIST node whose
1071 purpose and value fields are PARM and VALUE. */
1074 build_tree_list_stat (tree parm
, tree value MEM_STAT_DECL
)
1076 tree t
= make_node_stat (TREE_LIST PASS_MEM_STAT
);
1077 TREE_PURPOSE (t
) = parm
;
1078 TREE_VALUE (t
) = value
;
1082 /* Return a newly created TREE_LIST node whose
1083 purpose and value fields are PURPOSE and VALUE
1084 and whose TREE_CHAIN is CHAIN. */
1087 tree_cons_stat (tree purpose
, tree value
, tree chain MEM_STAT_DECL
)
1091 node
= ggc_alloc_zone_stat (sizeof (struct tree_list
),
1092 tree_zone PASS_MEM_STAT
);
1094 memset (node
, 0, sizeof (struct tree_common
));
1096 #ifdef GATHER_STATISTICS
1097 tree_node_counts
[(int) x_kind
]++;
1098 tree_node_sizes
[(int) x_kind
] += sizeof (struct tree_list
);
1101 TREE_SET_CODE (node
, TREE_LIST
);
1102 TREE_CHAIN (node
) = chain
;
1103 TREE_PURPOSE (node
) = purpose
;
1104 TREE_VALUE (node
) = value
;
1109 /* Return the size nominally occupied by an object of type TYPE
1110 when it resides in memory. The value is measured in units of bytes,
1111 and its data type is that normally used for type sizes
1112 (which is the first type created by make_signed_type or
1113 make_unsigned_type). */
1116 size_in_bytes (tree type
)
1120 if (type
== error_mark_node
)
1121 return integer_zero_node
;
1123 type
= TYPE_MAIN_VARIANT (type
);
1124 t
= TYPE_SIZE_UNIT (type
);
1128 lang_hooks
.types
.incomplete_type_error (NULL_TREE
, type
);
1129 return size_zero_node
;
1132 if (TREE_CODE (t
) == INTEGER_CST
)
1133 t
= force_fit_type (t
, 0, false, false);
1138 /* Return the size of TYPE (in bytes) as a wide integer
1139 or return -1 if the size can vary or is larger than an integer. */
1142 int_size_in_bytes (tree type
)
1146 if (type
== error_mark_node
)
1149 type
= TYPE_MAIN_VARIANT (type
);
1150 t
= TYPE_SIZE_UNIT (type
);
1152 || TREE_CODE (t
) != INTEGER_CST
1153 || TREE_OVERFLOW (t
)
1154 || TREE_INT_CST_HIGH (t
) != 0
1155 /* If the result would appear negative, it's too big to represent. */
1156 || (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0)
1159 return TREE_INT_CST_LOW (t
);
1162 /* Return the bit position of FIELD, in bits from the start of the record.
1163 This is a tree of type bitsizetype. */
1166 bit_position (tree field
)
1168 return bit_from_pos (DECL_FIELD_OFFSET (field
),
1169 DECL_FIELD_BIT_OFFSET (field
));
1172 /* Likewise, but return as an integer. Abort if it cannot be represented
1173 in that way (since it could be a signed value, we don't have the option
1174 of returning -1 like int_size_in_byte can. */
1177 int_bit_position (tree field
)
1179 return tree_low_cst (bit_position (field
), 0);
1182 /* Return the byte position of FIELD, in bytes from the start of the record.
1183 This is a tree of type sizetype. */
1186 byte_position (tree field
)
1188 return byte_from_pos (DECL_FIELD_OFFSET (field
),
1189 DECL_FIELD_BIT_OFFSET (field
));
1192 /* Likewise, but return as an integer. Abort if it cannot be represented
1193 in that way (since it could be a signed value, we don't have the option
1194 of returning -1 like int_size_in_byte can. */
1197 int_byte_position (tree field
)
1199 return tree_low_cst (byte_position (field
), 0);
1202 /* Return the strictest alignment, in bits, that T is known to have. */
1207 unsigned int align0
, align1
;
1209 switch (TREE_CODE (t
))
1211 case NOP_EXPR
: case CONVERT_EXPR
: case NON_LVALUE_EXPR
:
1212 /* If we have conversions, we know that the alignment of the
1213 object must meet each of the alignments of the types. */
1214 align0
= expr_align (TREE_OPERAND (t
, 0));
1215 align1
= TYPE_ALIGN (TREE_TYPE (t
));
1216 return MAX (align0
, align1
);
1218 case SAVE_EXPR
: case COMPOUND_EXPR
: case MODIFY_EXPR
:
1219 case INIT_EXPR
: case TARGET_EXPR
: case WITH_CLEANUP_EXPR
:
1220 case CLEANUP_POINT_EXPR
:
1221 /* These don't change the alignment of an object. */
1222 return expr_align (TREE_OPERAND (t
, 0));
1225 /* The best we can do is say that the alignment is the least aligned
1227 align0
= expr_align (TREE_OPERAND (t
, 1));
1228 align1
= expr_align (TREE_OPERAND (t
, 2));
1229 return MIN (align0
, align1
);
1231 case LABEL_DECL
: case CONST_DECL
:
1232 case VAR_DECL
: case PARM_DECL
: case RESULT_DECL
:
1233 if (DECL_ALIGN (t
) != 0)
1234 return DECL_ALIGN (t
);
1238 return FUNCTION_BOUNDARY
;
1244 /* Otherwise take the alignment from that of the type. */
1245 return TYPE_ALIGN (TREE_TYPE (t
));
1248 /* Return, as a tree node, the number of elements for TYPE (which is an
1249 ARRAY_TYPE) minus one. This counts only elements of the top array. */
1252 array_type_nelts (tree type
)
1254 tree index_type
, min
, max
;
1256 /* If they did it with unspecified bounds, then we should have already
1257 given an error about it before we got here. */
1258 if (! TYPE_DOMAIN (type
))
1259 return error_mark_node
;
1261 index_type
= TYPE_DOMAIN (type
);
1262 min
= TYPE_MIN_VALUE (index_type
);
1263 max
= TYPE_MAX_VALUE (index_type
);
1265 return (integer_zerop (min
)
1267 : fold (build2 (MINUS_EXPR
, TREE_TYPE (max
), max
, min
)));
1270 /* Return true if arg is static -- a reference to an object in
1271 static storage. This is not the same as the C meaning of `static'. */
1276 switch (TREE_CODE (arg
))
1279 /* Nested functions aren't static, since taking their address
1280 involves a trampoline. */
1281 return ((decl_function_context (arg
) == 0 || DECL_NO_STATIC_CHAIN (arg
))
1282 && ! DECL_NON_ADDR_CONST_P (arg
));
1285 return ((TREE_STATIC (arg
) || DECL_EXTERNAL (arg
))
1286 && ! DECL_THREAD_LOCAL (arg
)
1287 && ! DECL_NON_ADDR_CONST_P (arg
));
1290 return TREE_STATIC (arg
);
1297 /* If the thing being referenced is not a field, then it is
1298 something language specific. */
1299 if (TREE_CODE (TREE_OPERAND (arg
, 1)) != FIELD_DECL
)
1300 return (*lang_hooks
.staticp
) (arg
);
1302 /* If we are referencing a bitfield, we can't evaluate an
1303 ADDR_EXPR at compile time and so it isn't a constant. */
1304 if (DECL_BIT_FIELD (TREE_OPERAND (arg
, 1)))
1307 return staticp (TREE_OPERAND (arg
, 0));
1313 /* This case is technically correct, but results in setting
1314 TREE_CONSTANT on ADDR_EXPRs that cannot be evaluated at
1317 return TREE_CONSTANT (TREE_OPERAND (arg
, 0));
1321 case ARRAY_RANGE_REF
:
1322 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg
))) == INTEGER_CST
1323 && TREE_CODE (TREE_OPERAND (arg
, 1)) == INTEGER_CST
)
1324 return staticp (TREE_OPERAND (arg
, 0));
1329 if ((unsigned int) TREE_CODE (arg
)
1330 >= (unsigned int) LAST_AND_UNUSED_TREE_CODE
)
1331 return lang_hooks
.staticp (arg
);
1337 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
1338 Do this to any expression which may be used in more than one place,
1339 but must be evaluated only once.
1341 Normally, expand_expr would reevaluate the expression each time.
1342 Calling save_expr produces something that is evaluated and recorded
1343 the first time expand_expr is called on it. Subsequent calls to
1344 expand_expr just reuse the recorded value.
1346 The call to expand_expr that generates code that actually computes
1347 the value is the first call *at compile time*. Subsequent calls
1348 *at compile time* generate code to use the saved value.
1349 This produces correct result provided that *at run time* control
1350 always flows through the insns made by the first expand_expr
1351 before reaching the other places where the save_expr was evaluated.
1352 You, the caller of save_expr, must make sure this is so.
1354 Constants, and certain read-only nodes, are returned with no
1355 SAVE_EXPR because that is safe. Expressions containing placeholders
1356 are not touched; see tree.def for an explanation of what these
1360 save_expr (tree expr
)
1362 tree t
= fold (expr
);
1365 /* If the tree evaluates to a constant, then we don't want to hide that
1366 fact (i.e. this allows further folding, and direct checks for constants).
1367 However, a read-only object that has side effects cannot be bypassed.
1368 Since it is no problem to reevaluate literals, we just return the
1370 inner
= skip_simple_arithmetic (t
);
1372 if (TREE_INVARIANT (inner
)
1373 || (TREE_READONLY (inner
) && ! TREE_SIDE_EFFECTS (inner
))
1374 || TREE_CODE (inner
) == SAVE_EXPR
1375 || TREE_CODE (inner
) == ERROR_MARK
)
1378 /* If INNER contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
1379 it means that the size or offset of some field of an object depends on
1380 the value within another field.
1382 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
1383 and some variable since it would then need to be both evaluated once and
1384 evaluated more than once. Front-ends must assure this case cannot
1385 happen by surrounding any such subexpressions in their own SAVE_EXPR
1386 and forcing evaluation at the proper time. */
1387 if (contains_placeholder_p (inner
))
1390 t
= build1 (SAVE_EXPR
, TREE_TYPE (expr
), t
);
1392 /* This expression might be placed ahead of a jump to ensure that the
1393 value was computed on both sides of the jump. So make sure it isn't
1394 eliminated as dead. */
1395 TREE_SIDE_EFFECTS (t
) = 1;
1396 TREE_READONLY (t
) = 1;
1397 TREE_INVARIANT (t
) = 1;
1401 /* Look inside EXPR and into any simple arithmetic operations. Return
1402 the innermost non-arithmetic node. */
1405 skip_simple_arithmetic (tree expr
)
1409 /* We don't care about whether this can be used as an lvalue in this
1411 while (TREE_CODE (expr
) == NON_LVALUE_EXPR
)
1412 expr
= TREE_OPERAND (expr
, 0);
1414 /* If we have simple operations applied to a SAVE_EXPR or to a SAVE_EXPR and
1415 a constant, it will be more efficient to not make another SAVE_EXPR since
1416 it will allow better simplification and GCSE will be able to merge the
1417 computations if they actually occur. */
1421 if (TREE_CODE_CLASS (TREE_CODE (inner
)) == '1')
1422 inner
= TREE_OPERAND (inner
, 0);
1423 else if (TREE_CODE_CLASS (TREE_CODE (inner
)) == '2')
1425 if (TREE_INVARIANT (TREE_OPERAND (inner
, 1)))
1426 inner
= TREE_OPERAND (inner
, 0);
1427 else if (TREE_INVARIANT (TREE_OPERAND (inner
, 0)))
1428 inner
= TREE_OPERAND (inner
, 1);
1439 /* Returns the index of the first non-tree operand for CODE, or the number
1440 of operands if all are trees. */
1443 first_rtl_op (enum tree_code code
)
1448 return TREE_CODE_LENGTH (code
);
1452 /* Return which tree structure is used by T. */
1454 enum tree_node_structure_enum
1455 tree_node_structure (tree t
)
1457 enum tree_code code
= TREE_CODE (t
);
1459 switch (TREE_CODE_CLASS (code
))
1461 case 'd': return TS_DECL
;
1462 case 't': return TS_TYPE
;
1463 case 'r': case '<': case '1': case '2': case 'e': case 's':
1465 default: /* 'c' and 'x' */
1471 case INTEGER_CST
: return TS_INT_CST
;
1472 case REAL_CST
: return TS_REAL_CST
;
1473 case COMPLEX_CST
: return TS_COMPLEX
;
1474 case VECTOR_CST
: return TS_VECTOR
;
1475 case STRING_CST
: return TS_STRING
;
1477 case ERROR_MARK
: return TS_COMMON
;
1478 case IDENTIFIER_NODE
: return TS_IDENTIFIER
;
1479 case TREE_LIST
: return TS_LIST
;
1480 case TREE_VEC
: return TS_VEC
;
1481 case PHI_NODE
: return TS_PHI_NODE
;
1482 case SSA_NAME
: return TS_SSA_NAME
;
1483 case PLACEHOLDER_EXPR
: return TS_COMMON
;
1484 case STATEMENT_LIST
: return TS_STATEMENT_LIST
;
1485 case BLOCK
: return TS_BLOCK
;
1486 case TREE_BINFO
: return TS_BINFO
;
1487 case VALUE_HANDLE
: return TS_VALUE_HANDLE
;
1494 /* Perform any modifications to EXPR required when it is unsaved. Does
1495 not recurse into EXPR's subtrees. */
1498 unsave_expr_1 (tree expr
)
1500 switch (TREE_CODE (expr
))
1503 /* Don't mess with a TARGET_EXPR that hasn't been expanded.
1504 It's OK for this to happen if it was part of a subtree that
1505 isn't immediately expanded, such as operand 2 of another
1507 if (TREE_OPERAND (expr
, 1))
1510 TREE_OPERAND (expr
, 1) = TREE_OPERAND (expr
, 3);
1511 TREE_OPERAND (expr
, 3) = NULL_TREE
;
1519 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
1520 or offset that depends on a field within a record. */
1523 contains_placeholder_p (tree exp
)
1525 enum tree_code code
;
1530 code
= TREE_CODE (exp
);
1531 if (code
== PLACEHOLDER_EXPR
)
1534 switch (TREE_CODE_CLASS (code
))
1537 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
1538 position computations since they will be converted into a
1539 WITH_RECORD_EXPR involving the reference, which will assume
1540 here will be valid. */
1541 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0));
1544 if (code
== TREE_LIST
)
1545 return (CONTAINS_PLACEHOLDER_P (TREE_VALUE (exp
))
1546 || CONTAINS_PLACEHOLDER_P (TREE_CHAIN (exp
)));
1555 /* Ignoring the first operand isn't quite right, but works best. */
1556 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1));
1559 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0))
1560 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1))
1561 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 2)));
1567 switch (first_rtl_op (code
))
1570 return CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0));
1572 return (CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 0))
1573 || CONTAINS_PLACEHOLDER_P (TREE_OPERAND (exp
, 1)));
1584 /* Return 1 if any part of the computation of TYPE involves a PLACEHOLDER_EXPR.
1585 This includes size, bounds, qualifiers (for QUAL_UNION_TYPE) and field
1589 type_contains_placeholder_p (tree type
)
1591 /* If the size contains a placeholder or the parent type (component type in
1592 the case of arrays) type involves a placeholder, this type does. */
1593 if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (type
))
1594 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE_UNIT (type
))
1595 || (TREE_TYPE (type
) != 0
1596 && type_contains_placeholder_p (TREE_TYPE (type
))))
1599 /* Now do type-specific checks. Note that the last part of the check above
1600 greatly limits what we have to do below. */
1601 switch (TREE_CODE (type
))
1610 case REFERENCE_TYPE
:
1618 /* Here we just check the bounds. */
1619 return (CONTAINS_PLACEHOLDER_P (TYPE_MIN_VALUE (type
))
1620 || CONTAINS_PLACEHOLDER_P (TYPE_MAX_VALUE (type
)));
1625 /* We're already checked the component type (TREE_TYPE), so just check
1627 return type_contains_placeholder_p (TYPE_DOMAIN (type
));
1631 case QUAL_UNION_TYPE
:
1633 static tree seen_types
= 0;
1637 /* We have to be careful here that we don't end up in infinite
1638 recursions due to a field of a type being a pointer to that type
1639 or to a mutually-recursive type. So we store a list of record
1640 types that we've seen and see if this type is in them. To save
1641 memory, we don't use a list for just one type. Here we check
1642 whether we've seen this type before and store it if not. */
1643 if (seen_types
== 0)
1645 else if (TREE_CODE (seen_types
) != TREE_LIST
)
1647 if (seen_types
== type
)
1650 seen_types
= tree_cons (NULL_TREE
, type
,
1651 build_tree_list (NULL_TREE
, seen_types
));
1655 if (value_member (type
, seen_types
) != 0)
1658 seen_types
= tree_cons (NULL_TREE
, type
, seen_types
);
1661 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
1662 if (TREE_CODE (field
) == FIELD_DECL
1663 && (CONTAINS_PLACEHOLDER_P (DECL_FIELD_OFFSET (field
))
1664 || (TREE_CODE (type
) == QUAL_UNION_TYPE
1665 && CONTAINS_PLACEHOLDER_P (DECL_QUALIFIER (field
)))
1666 || type_contains_placeholder_p (TREE_TYPE (field
))))
1672 /* Now remove us from seen_types and return the result. */
1673 if (seen_types
== type
)
1676 seen_types
= TREE_CHAIN (seen_types
);
1686 /* Return 1 if EXP contains any expressions that produce cleanups for an
1687 outer scope to deal with. Used by fold. */
1690 has_cleanups (tree exp
)
1694 if (! TREE_SIDE_EFFECTS (exp
))
1697 switch (TREE_CODE (exp
))
1700 case WITH_CLEANUP_EXPR
:
1703 case CLEANUP_POINT_EXPR
:
1707 for (exp
= TREE_OPERAND (exp
, 1); exp
; exp
= TREE_CHAIN (exp
))
1709 cmp
= has_cleanups (TREE_VALUE (exp
));
1716 return (DECL_INITIAL (DECL_EXPR_DECL (exp
))
1717 && has_cleanups (DECL_INITIAL (DECL_EXPR_DECL (exp
))));
1723 /* This general rule works for most tree codes. All exceptions should be
1724 handled above. If this is a language-specific tree code, we can't
1725 trust what might be in the operand, so say we don't know
1727 if ((int) TREE_CODE (exp
) >= (int) LAST_AND_UNUSED_TREE_CODE
)
1730 nops
= first_rtl_op (TREE_CODE (exp
));
1731 for (i
= 0; i
< nops
; i
++)
1732 if (TREE_OPERAND (exp
, i
) != 0)
1734 int type
= TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp
, i
)));
1735 if (type
== 'e' || type
== '<' || type
== '1' || type
== '2'
1736 || type
== 'r' || type
== 's')
1738 cmp
= has_cleanups (TREE_OPERAND (exp
, i
));
1747 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
1748 return a tree with all occurrences of references to F in a
1749 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
1750 contains only arithmetic expressions or a CALL_EXPR with a
1751 PLACEHOLDER_EXPR occurring only in its arglist. */
1754 substitute_in_expr (tree exp
, tree f
, tree r
)
1756 enum tree_code code
= TREE_CODE (exp
);
1761 /* We handle TREE_LIST and COMPONENT_REF separately. */
1762 if (code
== TREE_LIST
)
1764 op0
= SUBSTITUTE_IN_EXPR (TREE_CHAIN (exp
), f
, r
);
1765 op1
= SUBSTITUTE_IN_EXPR (TREE_VALUE (exp
), f
, r
);
1766 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
1769 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
1771 else if (code
== COMPONENT_REF
)
1773 /* If this expression is getting a value from a PLACEHOLDER_EXPR
1774 and it is the right field, replace it with R. */
1775 for (inner
= TREE_OPERAND (exp
, 0);
1776 TREE_CODE_CLASS (TREE_CODE (inner
)) == 'r';
1777 inner
= TREE_OPERAND (inner
, 0))
1779 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
1780 && TREE_OPERAND (exp
, 1) == f
)
1783 /* If this expression hasn't been completed let, leave it alone. */
1784 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
&& TREE_TYPE (inner
) == 0)
1787 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
1788 if (op0
== TREE_OPERAND (exp
, 0))
1791 new = fold (build3 (COMPONENT_REF
, TREE_TYPE (exp
),
1792 op0
, TREE_OPERAND (exp
, 1), NULL_TREE
));
1795 switch (TREE_CODE_CLASS (code
))
1807 switch (first_rtl_op (code
))
1813 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
1814 if (op0
== TREE_OPERAND (exp
, 0))
1817 new = fold (build1 (code
, TREE_TYPE (exp
), op0
));
1821 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
1822 op1
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 1), f
, r
);
1824 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
1827 new = fold (build2 (code
, TREE_TYPE (exp
), op0
, op1
));
1831 op0
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 0), f
, r
);
1832 op1
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 1), f
, r
);
1833 op2
= SUBSTITUTE_IN_EXPR (TREE_OPERAND (exp
, 2), f
, r
);
1835 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
1836 && op2
== TREE_OPERAND (exp
, 2))
1839 new = fold (build3 (code
, TREE_TYPE (exp
), op0
, op1
, op2
));
1851 TREE_READONLY (new) = TREE_READONLY (exp
);
1855 /* Similar, but look for a PLACEHOLDER_EXPR in EXP and find a replacement
1856 for it within OBJ, a tree that is an object or a chain of references. */
1859 substitute_placeholder_in_expr (tree exp
, tree obj
)
1861 enum tree_code code
= TREE_CODE (exp
);
1862 tree op0
, op1
, op2
, op3
;
1864 /* If this is a PLACEHOLDER_EXPR, see if we find a corresponding type
1865 in the chain of OBJ. */
1866 if (code
== PLACEHOLDER_EXPR
)
1868 tree need_type
= TYPE_MAIN_VARIANT (TREE_TYPE (exp
));
1871 for (elt
= obj
; elt
!= 0;
1872 elt
= ((TREE_CODE (elt
) == COMPOUND_EXPR
1873 || TREE_CODE (elt
) == COND_EXPR
)
1874 ? TREE_OPERAND (elt
, 1)
1875 : (TREE_CODE_CLASS (TREE_CODE (elt
)) == 'r'
1876 || TREE_CODE_CLASS (TREE_CODE (elt
)) == '1'
1877 || TREE_CODE_CLASS (TREE_CODE (elt
)) == '2'
1878 || TREE_CODE_CLASS (TREE_CODE (elt
)) == 'e')
1879 ? TREE_OPERAND (elt
, 0) : 0))
1880 if (TYPE_MAIN_VARIANT (TREE_TYPE (elt
)) == need_type
)
1883 for (elt
= obj
; elt
!= 0;
1884 elt
= ((TREE_CODE (elt
) == COMPOUND_EXPR
1885 || TREE_CODE (elt
) == COND_EXPR
)
1886 ? TREE_OPERAND (elt
, 1)
1887 : (TREE_CODE_CLASS (TREE_CODE (elt
)) == 'r'
1888 || TREE_CODE_CLASS (TREE_CODE (elt
)) == '1'
1889 || TREE_CODE_CLASS (TREE_CODE (elt
)) == '2'
1890 || TREE_CODE_CLASS (TREE_CODE (elt
)) == 'e')
1891 ? TREE_OPERAND (elt
, 0) : 0))
1892 if (POINTER_TYPE_P (TREE_TYPE (elt
))
1893 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (elt
)))
1895 return fold (build1 (INDIRECT_REF
, need_type
, elt
));
1897 /* If we didn't find it, return the original PLACEHOLDER_EXPR. If it
1898 survives until RTL generation, there will be an error. */
1902 /* TREE_LIST is special because we need to look at TREE_VALUE
1903 and TREE_CHAIN, not TREE_OPERANDS. */
1904 else if (code
== TREE_LIST
)
1906 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_CHAIN (exp
), obj
);
1907 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_VALUE (exp
), obj
);
1908 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
1911 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
1914 switch (TREE_CODE_CLASS (code
))
1927 switch (first_rtl_op (code
))
1933 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
1934 if (op0
== TREE_OPERAND (exp
, 0))
1937 return fold (build1 (code
, TREE_TYPE (exp
), op0
));
1940 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
1941 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
1943 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
1946 return fold (build2 (code
, TREE_TYPE (exp
), op0
, op1
));
1949 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
1950 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
1951 op2
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 2), obj
);
1953 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
1954 && op2
== TREE_OPERAND (exp
, 2))
1957 return fold (build3 (code
, TREE_TYPE (exp
), op0
, op1
, op2
));
1960 op0
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 0), obj
);
1961 op1
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 1), obj
);
1962 op2
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 2), obj
);
1963 op3
= SUBSTITUTE_PLACEHOLDER_IN_EXPR (TREE_OPERAND (exp
, 3), obj
);
1965 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
1966 && op2
== TREE_OPERAND (exp
, 2)
1967 && op3
== TREE_OPERAND (exp
, 3))
1970 return fold (build4 (code
, TREE_TYPE (exp
), op0
, op1
, op2
, op3
));
1982 /* Stabilize a reference so that we can use it any number of times
1983 without causing its operands to be evaluated more than once.
1984 Returns the stabilized reference. This works by means of save_expr,
1985 so see the caveats in the comments about save_expr.
1987 Also allows conversion expressions whose operands are references.
1988 Any other kind of expression is returned unchanged. */
1991 stabilize_reference (tree ref
)
1994 enum tree_code code
= TREE_CODE (ref
);
2001 /* No action is needed in this case. */
2007 case FIX_TRUNC_EXPR
:
2008 case FIX_FLOOR_EXPR
:
2009 case FIX_ROUND_EXPR
:
2011 result
= build_nt (code
, stabilize_reference (TREE_OPERAND (ref
, 0)));
2015 result
= build_nt (INDIRECT_REF
,
2016 stabilize_reference_1 (TREE_OPERAND (ref
, 0)));
2020 result
= build_nt (COMPONENT_REF
,
2021 stabilize_reference (TREE_OPERAND (ref
, 0)),
2022 TREE_OPERAND (ref
, 1), NULL_TREE
);
2026 result
= build_nt (BIT_FIELD_REF
,
2027 stabilize_reference (TREE_OPERAND (ref
, 0)),
2028 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2029 stabilize_reference_1 (TREE_OPERAND (ref
, 2)));
2033 result
= build_nt (ARRAY_REF
,
2034 stabilize_reference (TREE_OPERAND (ref
, 0)),
2035 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2036 TREE_OPERAND (ref
, 2), TREE_OPERAND (ref
, 3));
2039 case ARRAY_RANGE_REF
:
2040 result
= build_nt (ARRAY_RANGE_REF
,
2041 stabilize_reference (TREE_OPERAND (ref
, 0)),
2042 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2043 TREE_OPERAND (ref
, 2), TREE_OPERAND (ref
, 3));
2047 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2048 it wouldn't be ignored. This matters when dealing with
2050 return stabilize_reference_1 (ref
);
2052 /* If arg isn't a kind of lvalue we recognize, make no change.
2053 Caller should recognize the error for an invalid lvalue. */
2058 return error_mark_node
;
2061 TREE_TYPE (result
) = TREE_TYPE (ref
);
2062 TREE_READONLY (result
) = TREE_READONLY (ref
);
2063 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (ref
);
2064 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (ref
);
2069 /* Subroutine of stabilize_reference; this is called for subtrees of
2070 references. Any expression with side-effects must be put in a SAVE_EXPR
2071 to ensure that it is only evaluated once.
2073 We don't put SAVE_EXPR nodes around everything, because assigning very
2074 simple expressions to temporaries causes us to miss good opportunities
2075 for optimizations. Among other things, the opportunity to fold in the
2076 addition of a constant into an addressing mode often gets lost, e.g.
2077 "y[i+1] += x;". In general, we take the approach that we should not make
2078 an assignment unless we are forced into it - i.e., that any non-side effect
2079 operator should be allowed, and that cse should take care of coalescing
2080 multiple utterances of the same expression should that prove fruitful. */
2083 stabilize_reference_1 (tree e
)
2086 enum tree_code code
= TREE_CODE (e
);
2088 /* We cannot ignore const expressions because it might be a reference
2089 to a const array but whose index contains side-effects. But we can
2090 ignore things that are actual constant or that already have been
2091 handled by this function. */
2093 if (TREE_INVARIANT (e
))
2096 switch (TREE_CODE_CLASS (code
))
2105 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2106 so that it will only be evaluated once. */
2107 /* The reference (r) and comparison (<) classes could be handled as
2108 below, but it is generally faster to only evaluate them once. */
2109 if (TREE_SIDE_EFFECTS (e
))
2110 return save_expr (e
);
2114 /* Constants need no processing. In fact, we should never reach
2119 /* Division is slow and tends to be compiled with jumps,
2120 especially the division by powers of 2 that is often
2121 found inside of an array reference. So do it just once. */
2122 if (code
== TRUNC_DIV_EXPR
|| code
== TRUNC_MOD_EXPR
2123 || code
== FLOOR_DIV_EXPR
|| code
== FLOOR_MOD_EXPR
2124 || code
== CEIL_DIV_EXPR
|| code
== CEIL_MOD_EXPR
2125 || code
== ROUND_DIV_EXPR
|| code
== ROUND_MOD_EXPR
)
2126 return save_expr (e
);
2127 /* Recursively stabilize each operand. */
2128 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)),
2129 stabilize_reference_1 (TREE_OPERAND (e
, 1)));
2133 /* Recursively stabilize each operand. */
2134 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)));
2141 TREE_TYPE (result
) = TREE_TYPE (e
);
2142 TREE_READONLY (result
) = TREE_READONLY (e
);
2143 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (e
);
2144 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (e
);
2145 TREE_INVARIANT (result
) = 1;
2150 /* Low-level constructors for expressions. */
2152 /* A helper function for build1 and constant folders. Set TREE_CONSTANT,
2153 TREE_INVARIANT, and TREE_SIDE_EFFECTS for an ADDR_EXPR. */
2156 recompute_tree_invarant_for_addr_expr (tree t
)
2159 bool tc
= true, ti
= true, se
= false;
2161 /* We started out assuming this address is both invariant and constant, but
2162 does not have side effects. Now go down any handled components and see if
2163 any of them involve offsets that are either non-constant or non-invariant.
2164 Also check for side-effects.
2166 ??? Note that this code makes no attempt to deal with the case where
2167 taking the address of something causes a copy due to misalignment. */
2169 #define UPDATE_TITCSE(NODE) \
2170 do { tree _node = (NODE); \
2171 if (_node && !TREE_INVARIANT (_node)) ti = false; \
2172 if (_node && !TREE_CONSTANT (_node)) tc = false; \
2173 if (_node && TREE_SIDE_EFFECTS (_node)) se = true; } while (0)
2175 for (node
= TREE_OPERAND (t
, 0); handled_component_p (node
);
2176 node
= TREE_OPERAND (node
, 0))
2178 /* If the first operand doesn't have an ARRAY_TYPE, this is a bogus
2179 array reference (probably made temporarily by the G++ front end),
2180 so ignore all the operands. */
2181 if ((TREE_CODE (node
) == ARRAY_REF
2182 || TREE_CODE (node
) == ARRAY_RANGE_REF
)
2183 && TREE_CODE (TREE_TYPE (TREE_OPERAND (node
, 0))) == ARRAY_TYPE
)
2185 UPDATE_TITCSE (TREE_OPERAND (node
, 1));
2186 UPDATE_TITCSE (array_ref_low_bound (node
));
2187 UPDATE_TITCSE (array_ref_element_size (node
));
2189 /* Likewise, just because this is a COMPONENT_REF doesn't mean we have a
2190 FIELD_DECL, apparently. The G++ front end can put something else
2191 there, at least temporarily. */
2192 else if (TREE_CODE (node
) == COMPONENT_REF
2193 && TREE_CODE (TREE_OPERAND (node
, 1)) == FIELD_DECL
)
2194 UPDATE_TITCSE (component_ref_field_offset (node
));
2195 else if (TREE_CODE (node
) == BIT_FIELD_REF
)
2196 UPDATE_TITCSE (TREE_OPERAND (node
, 2));
2199 /* Now see what's inside. If it's an INDIRECT_REF, copy our properties from
2200 it. If it's a decl, it's invariant and constant if the decl is static.
2201 It's also invariant if it's a decl in the current function. (Taking the
2202 address of a volatile variable is not volatile.) If it's a constant,
2203 the address is both invariant and constant. Otherwise it's neither. */
2204 if (TREE_CODE (node
) == INDIRECT_REF
)
2205 UPDATE_TITCSE (node
);
2206 else if (DECL_P (node
))
2210 else if (decl_function_context (node
) == current_function_decl
)
2215 else if (TREE_CODE_CLASS (TREE_CODE (node
)) == 'c')
2220 se
|= TREE_SIDE_EFFECTS (node
);
2223 TREE_CONSTANT (t
) = tc
;
2224 TREE_INVARIANT (t
) = ti
;
2225 TREE_SIDE_EFFECTS (t
) = se
;
2226 #undef UPDATE_TITCSE
2229 /* Build an expression of code CODE, data type TYPE, and operands as
2230 specified. Expressions and reference nodes can be created this way.
2231 Constants, decls, types and misc nodes cannot be.
2233 We define 5 non-variadic functions, from 0 to 4 arguments. This is
2234 enough for all extant tree codes. These functions can be called
2235 directly (preferably!), but can also be obtained via GCC preprocessor
2236 magic within the build macro. */
2239 build0_stat (enum tree_code code
, tree tt MEM_STAT_DECL
)
2243 #ifdef ENABLE_CHECKING
2244 if (TREE_CODE_LENGTH (code
) != 0)
2248 t
= make_node_stat (code PASS_MEM_STAT
);
2255 build1_stat (enum tree_code code
, tree type
, tree node MEM_STAT_DECL
)
2257 int length
= sizeof (struct tree_exp
);
2258 #ifdef GATHER_STATISTICS
2259 tree_node_kind kind
;
2263 #ifdef GATHER_STATISTICS
2264 switch (TREE_CODE_CLASS (code
))
2266 case 's': /* an expression with side effects */
2269 case 'r': /* a reference */
2277 tree_node_counts
[(int) kind
]++;
2278 tree_node_sizes
[(int) kind
] += length
;
2281 #ifdef ENABLE_CHECKING
2282 if (TREE_CODE_LENGTH (code
) != 1)
2284 #endif /* ENABLE_CHECKING */
2286 t
= ggc_alloc_zone_stat (length
, tree_zone PASS_MEM_STAT
);
2288 memset (t
, 0, sizeof (struct tree_common
));
2290 TREE_SET_CODE (t
, code
);
2292 TREE_TYPE (t
) = type
;
2293 #ifdef USE_MAPPED_LOCATION
2294 SET_EXPR_LOCATION (t
, UNKNOWN_LOCATION
);
2296 SET_EXPR_LOCUS (t
, NULL
);
2298 TREE_COMPLEXITY (t
) = 0;
2299 TREE_OPERAND (t
, 0) = node
;
2300 TREE_BLOCK (t
) = NULL_TREE
;
2301 if (node
&& !TYPE_P (node
) && first_rtl_op (code
) != 0)
2303 TREE_SIDE_EFFECTS (t
) = TREE_SIDE_EFFECTS (node
);
2304 TREE_READONLY (t
) = TREE_READONLY (node
);
2307 if (TREE_CODE_CLASS (code
) == 's')
2308 TREE_SIDE_EFFECTS (t
) = 1;
2314 case PREDECREMENT_EXPR
:
2315 case PREINCREMENT_EXPR
:
2316 case POSTDECREMENT_EXPR
:
2317 case POSTINCREMENT_EXPR
:
2318 /* All of these have side-effects, no matter what their
2320 TREE_SIDE_EFFECTS (t
) = 1;
2321 TREE_READONLY (t
) = 0;
2325 /* Whether a dereference is readonly has nothing to do with whether
2326 its operand is readonly. */
2327 TREE_READONLY (t
) = 0;
2332 recompute_tree_invarant_for_addr_expr (t
);
2336 if (TREE_CODE_CLASS (code
) == '1' && node
&& !TYPE_P (node
)
2337 && TREE_CONSTANT (node
))
2338 TREE_CONSTANT (t
) = 1;
2339 if (TREE_CODE_CLASS (code
) == '1' && node
&& TREE_INVARIANT (node
))
2340 TREE_INVARIANT (t
) = 1;
2341 if (TREE_CODE_CLASS (code
) == 'r' && node
&& TREE_THIS_VOLATILE (node
))
2342 TREE_THIS_VOLATILE (t
) = 1;
2349 #define PROCESS_ARG(N) \
2351 TREE_OPERAND (t, N) = arg##N; \
2352 if (arg##N &&!TYPE_P (arg##N) && fro > N) \
2354 if (TREE_SIDE_EFFECTS (arg##N)) \
2356 if (!TREE_READONLY (arg##N)) \
2358 if (!TREE_CONSTANT (arg##N)) \
2360 if (!TREE_INVARIANT (arg##N)) \
2366 build2_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1 MEM_STAT_DECL
)
2368 bool constant
, read_only
, side_effects
, invariant
;
2372 #ifdef ENABLE_CHECKING
2373 if (TREE_CODE_LENGTH (code
) != 2)
2377 t
= make_node_stat (code PASS_MEM_STAT
);
2380 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
2381 result based on those same flags for the arguments. But if the
2382 arguments aren't really even `tree' expressions, we shouldn't be trying
2384 fro
= first_rtl_op (code
);
2386 /* Expressions without side effects may be constant if their
2387 arguments are as well. */
2388 constant
= (TREE_CODE_CLASS (code
) == '<'
2389 || TREE_CODE_CLASS (code
) == '2');
2391 side_effects
= TREE_SIDE_EFFECTS (t
);
2392 invariant
= constant
;
2397 TREE_READONLY (t
) = read_only
;
2398 TREE_CONSTANT (t
) = constant
;
2399 TREE_INVARIANT (t
) = invariant
;
2400 TREE_SIDE_EFFECTS (t
) = side_effects
;
2401 TREE_THIS_VOLATILE (t
)
2402 = TREE_CODE_CLASS (code
) == 'r' && arg0
&& TREE_THIS_VOLATILE (arg0
);
2408 build3_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
2409 tree arg2 MEM_STAT_DECL
)
2411 bool constant
, read_only
, side_effects
, invariant
;
2415 #ifdef ENABLE_CHECKING
2416 if (TREE_CODE_LENGTH (code
) != 3)
2420 t
= make_node_stat (code PASS_MEM_STAT
);
2423 fro
= first_rtl_op (code
);
2425 side_effects
= TREE_SIDE_EFFECTS (t
);
2431 if (code
== CALL_EXPR
&& !side_effects
)
2436 /* Calls have side-effects, except those to const or
2438 i
= call_expr_flags (t
);
2439 if (!(i
& (ECF_CONST
| ECF_PURE
)))
2442 /* And even those have side-effects if their arguments do. */
2443 else for (node
= arg1
; node
; node
= TREE_CHAIN (node
))
2444 if (TREE_SIDE_EFFECTS (TREE_VALUE (node
)))
2451 TREE_SIDE_EFFECTS (t
) = side_effects
;
2452 TREE_THIS_VOLATILE (t
)
2453 = TREE_CODE_CLASS (code
) == 'r' && arg0
&& TREE_THIS_VOLATILE (arg0
);
2459 build4_stat (enum tree_code code
, tree tt
, tree arg0
, tree arg1
,
2460 tree arg2
, tree arg3 MEM_STAT_DECL
)
2462 bool constant
, read_only
, side_effects
, invariant
;
2466 #ifdef ENABLE_CHECKING
2467 if (TREE_CODE_LENGTH (code
) != 4)
2471 t
= make_node_stat (code PASS_MEM_STAT
);
2474 fro
= first_rtl_op (code
);
2476 side_effects
= TREE_SIDE_EFFECTS (t
);
2483 TREE_SIDE_EFFECTS (t
) = side_effects
;
2484 TREE_THIS_VOLATILE (t
)
2485 = TREE_CODE_CLASS (code
) == 'r' && arg0
&& TREE_THIS_VOLATILE (arg0
);
2490 /* Backup definition for non-gcc build compilers. */
2493 (build
) (enum tree_code code
, tree tt
, ...)
2495 tree t
, arg0
, arg1
, arg2
, arg3
;
2496 int length
= TREE_CODE_LENGTH (code
);
2503 t
= build0 (code
, tt
);
2506 arg0
= va_arg (p
, tree
);
2507 t
= build1 (code
, tt
, arg0
);
2510 arg0
= va_arg (p
, tree
);
2511 arg1
= va_arg (p
, tree
);
2512 t
= build2 (code
, tt
, arg0
, arg1
);
2515 arg0
= va_arg (p
, tree
);
2516 arg1
= va_arg (p
, tree
);
2517 arg2
= va_arg (p
, tree
);
2518 t
= build3 (code
, tt
, arg0
, arg1
, arg2
);
2521 arg0
= va_arg (p
, tree
);
2522 arg1
= va_arg (p
, tree
);
2523 arg2
= va_arg (p
, tree
);
2524 arg3
= va_arg (p
, tree
);
2525 t
= build4 (code
, tt
, arg0
, arg1
, arg2
, arg3
);
2535 /* Similar except don't specify the TREE_TYPE
2536 and leave the TREE_SIDE_EFFECTS as 0.
2537 It is permissible for arguments to be null,
2538 or even garbage if their values do not matter. */
2541 build_nt (enum tree_code code
, ...)
2550 t
= make_node (code
);
2551 length
= TREE_CODE_LENGTH (code
);
2553 for (i
= 0; i
< length
; i
++)
2554 TREE_OPERAND (t
, i
) = va_arg (p
, tree
);
2560 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
2561 We do NOT enter this node in any sort of symbol table.
2563 layout_decl is used to set up the decl's storage layout.
2564 Other slots are initialized to 0 or null pointers. */
2567 build_decl_stat (enum tree_code code
, tree name
, tree type MEM_STAT_DECL
)
2571 t
= make_node_stat (code PASS_MEM_STAT
);
2573 /* if (type == error_mark_node)
2574 type = integer_type_node; */
2575 /* That is not done, deliberately, so that having error_mark_node
2576 as the type can suppress useless errors in the use of this variable. */
2578 DECL_NAME (t
) = name
;
2579 TREE_TYPE (t
) = type
;
2581 if (code
== VAR_DECL
|| code
== PARM_DECL
|| code
== RESULT_DECL
)
2583 else if (code
== FUNCTION_DECL
)
2584 DECL_MODE (t
) = FUNCTION_MODE
;
2586 /* Set default visibility to whatever the user supplied with
2587 visibility_specified depending on #pragma GCC visibility. */
2588 DECL_VISIBILITY (t
) = default_visibility
;
2589 DECL_VISIBILITY_SPECIFIED (t
) = visibility_options
.inpragma
;
2594 /* BLOCK nodes are used to represent the structure of binding contours
2595 and declarations, once those contours have been exited and their contents
2596 compiled. This information is used for outputting debugging info. */
2599 build_block (tree vars
, tree tags ATTRIBUTE_UNUSED
, tree subblocks
,
2600 tree supercontext
, tree chain
)
2602 tree block
= make_node (BLOCK
);
2604 BLOCK_VARS (block
) = vars
;
2605 BLOCK_SUBBLOCKS (block
) = subblocks
;
2606 BLOCK_SUPERCONTEXT (block
) = supercontext
;
2607 BLOCK_CHAIN (block
) = chain
;
2611 #if 1 /* ! defined(USE_MAPPED_LOCATION) */
2612 /* ??? gengtype doesn't handle conditionals */
2613 static GTY(()) tree last_annotated_node
;
2616 #ifdef USE_MAPPED_LOCATION
2619 expand_location (source_location loc
)
2621 expanded_location xloc
;
2622 if (loc
== 0) { xloc
.file
= NULL
; xloc
.line
= 0; xloc
.column
= 0; }
2625 const struct line_map
*map
= linemap_lookup (&line_table
, loc
);
2626 xloc
.file
= map
->to_file
;
2627 xloc
.line
= SOURCE_LINE (map
, loc
);
2628 xloc
.column
= SOURCE_COLUMN (map
, loc
);
2635 /* Record the exact location where an expression or an identifier were
2639 annotate_with_file_line (tree node
, const char *file
, int line
)
2641 /* Roughly one percent of the calls to this function are to annotate
2642 a node with the same information already attached to that node!
2643 Just return instead of wasting memory. */
2644 if (EXPR_LOCUS (node
)
2645 && (EXPR_FILENAME (node
) == file
2646 || ! strcmp (EXPR_FILENAME (node
), file
))
2647 && EXPR_LINENO (node
) == line
)
2649 last_annotated_node
= node
;
2653 /* In heavily macroized code (such as GCC itself) this single
2654 entry cache can reduce the number of allocations by more
2656 if (last_annotated_node
2657 && EXPR_LOCUS (last_annotated_node
)
2658 && (EXPR_FILENAME (last_annotated_node
) == file
2659 || ! strcmp (EXPR_FILENAME (last_annotated_node
), file
))
2660 && EXPR_LINENO (last_annotated_node
) == line
)
2662 SET_EXPR_LOCUS (node
, EXPR_LOCUS (last_annotated_node
));
2666 SET_EXPR_LOCUS (node
, ggc_alloc (sizeof (location_t
)));
2667 EXPR_LINENO (node
) = line
;
2668 EXPR_FILENAME (node
) = file
;
2669 last_annotated_node
= node
;
2673 annotate_with_locus (tree node
, location_t locus
)
2675 annotate_with_file_line (node
, locus
.file
, locus
.line
);
2679 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
2683 build_decl_attribute_variant (tree ddecl
, tree attribute
)
2685 DECL_ATTRIBUTES (ddecl
) = attribute
;
2689 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
2692 Record such modified types already made so we don't make duplicates. */
2695 build_type_attribute_variant (tree ttype
, tree attribute
)
2697 if (! attribute_list_equal (TYPE_ATTRIBUTES (ttype
), attribute
))
2699 hashval_t hashcode
= 0;
2701 enum tree_code code
= TREE_CODE (ttype
);
2703 ntype
= copy_node (ttype
);
2705 TYPE_POINTER_TO (ntype
) = 0;
2706 TYPE_REFERENCE_TO (ntype
) = 0;
2707 TYPE_ATTRIBUTES (ntype
) = attribute
;
2709 /* Create a new main variant of TYPE. */
2710 TYPE_MAIN_VARIANT (ntype
) = ntype
;
2711 TYPE_NEXT_VARIANT (ntype
) = 0;
2712 set_type_quals (ntype
, TYPE_UNQUALIFIED
);
2714 hashcode
= iterative_hash_object (code
, hashcode
);
2715 if (TREE_TYPE (ntype
))
2716 hashcode
= iterative_hash_object (TYPE_HASH (TREE_TYPE (ntype
)),
2718 hashcode
= attribute_hash_list (attribute
, hashcode
);
2720 switch (TREE_CODE (ntype
))
2723 hashcode
= type_hash_list (TYPE_ARG_TYPES (ntype
), hashcode
);
2726 hashcode
= iterative_hash_object (TYPE_HASH (TYPE_DOMAIN (ntype
)),
2730 hashcode
= iterative_hash_object
2731 (TREE_INT_CST_LOW (TYPE_MAX_VALUE (ntype
)), hashcode
);
2732 hashcode
= iterative_hash_object
2733 (TREE_INT_CST_HIGH (TYPE_MAX_VALUE (ntype
)), hashcode
);
2737 unsigned int precision
= TYPE_PRECISION (ntype
);
2738 hashcode
= iterative_hash_object (precision
, hashcode
);
2745 ntype
= type_hash_canon (hashcode
, ntype
);
2746 ttype
= build_qualified_type (ntype
, TYPE_QUALS (ttype
));
2752 /* Return nonzero if IDENT is a valid name for attribute ATTR,
2755 We try both `text' and `__text__', ATTR may be either one. */
2756 /* ??? It might be a reasonable simplification to require ATTR to be only
2757 `text'. One might then also require attribute lists to be stored in
2758 their canonicalized form. */
2761 is_attribute_p (const char *attr
, tree ident
)
2763 int ident_len
, attr_len
;
2766 if (TREE_CODE (ident
) != IDENTIFIER_NODE
)
2769 if (strcmp (attr
, IDENTIFIER_POINTER (ident
)) == 0)
2772 p
= IDENTIFIER_POINTER (ident
);
2773 ident_len
= strlen (p
);
2774 attr_len
= strlen (attr
);
2776 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
2780 || attr
[attr_len
- 2] != '_'
2781 || attr
[attr_len
- 1] != '_')
2783 if (ident_len
== attr_len
- 4
2784 && strncmp (attr
+ 2, p
, attr_len
- 4) == 0)
2789 if (ident_len
== attr_len
+ 4
2790 && p
[0] == '_' && p
[1] == '_'
2791 && p
[ident_len
- 2] == '_' && p
[ident_len
- 1] == '_'
2792 && strncmp (attr
, p
+ 2, attr_len
) == 0)
2799 /* Given an attribute name and a list of attributes, return a pointer to the
2800 attribute's list element if the attribute is part of the list, or NULL_TREE
2801 if not found. If the attribute appears more than once, this only
2802 returns the first occurrence; the TREE_CHAIN of the return value should
2803 be passed back in if further occurrences are wanted. */
2806 lookup_attribute (const char *attr_name
, tree list
)
2810 for (l
= list
; l
; l
= TREE_CHAIN (l
))
2812 if (TREE_CODE (TREE_PURPOSE (l
)) != IDENTIFIER_NODE
)
2814 if (is_attribute_p (attr_name
, TREE_PURPOSE (l
)))
2821 /* Return an attribute list that is the union of a1 and a2. */
2824 merge_attributes (tree a1
, tree a2
)
2828 /* Either one unset? Take the set one. */
2830 if ((attributes
= a1
) == 0)
2833 /* One that completely contains the other? Take it. */
2835 else if (a2
!= 0 && ! attribute_list_contained (a1
, a2
))
2837 if (attribute_list_contained (a2
, a1
))
2841 /* Pick the longest list, and hang on the other list. */
2843 if (list_length (a1
) < list_length (a2
))
2844 attributes
= a2
, a2
= a1
;
2846 for (; a2
!= 0; a2
= TREE_CHAIN (a2
))
2849 for (a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
2852 a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
2855 if (simple_cst_equal (TREE_VALUE (a
), TREE_VALUE (a2
)) == 1)
2860 a1
= copy_node (a2
);
2861 TREE_CHAIN (a1
) = attributes
;
2870 /* Given types T1 and T2, merge their attributes and return
2874 merge_type_attributes (tree t1
, tree t2
)
2876 return merge_attributes (TYPE_ATTRIBUTES (t1
),
2877 TYPE_ATTRIBUTES (t2
));
2880 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
2884 merge_decl_attributes (tree olddecl
, tree newdecl
)
2886 return merge_attributes (DECL_ATTRIBUTES (olddecl
),
2887 DECL_ATTRIBUTES (newdecl
));
2890 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
2892 /* Specialization of merge_decl_attributes for various Windows targets.
2894 This handles the following situation:
2896 __declspec (dllimport) int foo;
2899 The second instance of `foo' nullifies the dllimport. */
2902 merge_dllimport_decl_attributes (tree old
, tree
new)
2905 int delete_dllimport_p
;
2907 old
= DECL_ATTRIBUTES (old
);
2908 new = DECL_ATTRIBUTES (new);
2910 /* What we need to do here is remove from `old' dllimport if it doesn't
2911 appear in `new'. dllimport behaves like extern: if a declaration is
2912 marked dllimport and a definition appears later, then the object
2913 is not dllimport'd. */
2914 if (lookup_attribute ("dllimport", old
) != NULL_TREE
2915 && lookup_attribute ("dllimport", new) == NULL_TREE
)
2916 delete_dllimport_p
= 1;
2918 delete_dllimport_p
= 0;
2920 a
= merge_attributes (old
, new);
2922 if (delete_dllimport_p
)
2926 /* Scan the list for dllimport and delete it. */
2927 for (prev
= NULL_TREE
, t
= a
; t
; prev
= t
, t
= TREE_CHAIN (t
))
2929 if (is_attribute_p ("dllimport", TREE_PURPOSE (t
)))
2931 if (prev
== NULL_TREE
)
2934 TREE_CHAIN (prev
) = TREE_CHAIN (t
);
2943 /* Handle a "dllimport" or "dllexport" attribute; arguments as in
2944 struct attribute_spec.handler. */
2947 handle_dll_attribute (tree
* pnode
, tree name
, tree args
, int flags
,
2952 /* These attributes may apply to structure and union types being created,
2953 but otherwise should pass to the declaration involved. */
2956 if (flags
& ((int) ATTR_FLAG_DECL_NEXT
| (int) ATTR_FLAG_FUNCTION_NEXT
2957 | (int) ATTR_FLAG_ARRAY_NEXT
))
2959 *no_add_attrs
= true;
2960 return tree_cons (name
, args
, NULL_TREE
);
2962 if (TREE_CODE (node
) != RECORD_TYPE
&& TREE_CODE (node
) != UNION_TYPE
)
2964 warning ("`%s' attribute ignored", IDENTIFIER_POINTER (name
));
2965 *no_add_attrs
= true;
2971 /* Report error on dllimport ambiguities seen now before they cause
2973 if (is_attribute_p ("dllimport", name
))
2975 /* Like MS, treat definition of dllimported variables and
2976 non-inlined functions on declaration as syntax errors. We
2977 allow the attribute for function definitions if declared
2979 if (TREE_CODE (node
) == FUNCTION_DECL
&& DECL_INITIAL (node
)
2980 && !DECL_DECLARED_INLINE_P (node
))
2982 error ("%Jfunction `%D' definition is marked dllimport.", node
, node
);
2983 *no_add_attrs
= true;
2986 else if (TREE_CODE (node
) == VAR_DECL
)
2988 if (DECL_INITIAL (node
))
2990 error ("%Jvariable `%D' definition is marked dllimport.",
2992 *no_add_attrs
= true;
2995 /* `extern' needn't be specified with dllimport.
2996 Specify `extern' now and hope for the best. Sigh. */
2997 DECL_EXTERNAL (node
) = 1;
2998 /* Also, implicitly give dllimport'd variables declared within
2999 a function global scope, unless declared static. */
3000 if (current_function_decl
!= NULL_TREE
&& !TREE_STATIC (node
))
3001 TREE_PUBLIC (node
) = 1;
3005 /* Report error if symbol is not accessible at global scope. */
3006 if (!TREE_PUBLIC (node
)
3007 && (TREE_CODE (node
) == VAR_DECL
3008 || TREE_CODE (node
) == FUNCTION_DECL
))
3010 error ("%Jexternal linkage required for symbol '%D' because of "
3011 "'%s' attribute.", node
, node
, IDENTIFIER_POINTER (name
));
3012 *no_add_attrs
= true;
3018 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
3020 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
3021 of the various TYPE_QUAL values. */
3024 set_type_quals (tree type
, int type_quals
)
3026 TYPE_READONLY (type
) = (type_quals
& TYPE_QUAL_CONST
) != 0;
3027 TYPE_VOLATILE (type
) = (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
3028 TYPE_RESTRICT (type
) = (type_quals
& TYPE_QUAL_RESTRICT
) != 0;
3031 /* Returns true iff cand is equivalent to base with type_quals. */
3034 check_qualified_type (tree cand
, tree base
, int type_quals
)
3036 return (TYPE_QUALS (cand
) == type_quals
3037 && TYPE_NAME (cand
) == TYPE_NAME (base
)
3038 /* Apparently this is needed for Objective-C. */
3039 && TYPE_CONTEXT (cand
) == TYPE_CONTEXT (base
)
3040 && attribute_list_equal (TYPE_ATTRIBUTES (cand
),
3041 TYPE_ATTRIBUTES (base
)));
3044 /* Return a version of the TYPE, qualified as indicated by the
3045 TYPE_QUALS, if one exists. If no qualified version exists yet,
3046 return NULL_TREE. */
3049 get_qualified_type (tree type
, int type_quals
)
3053 if (TYPE_QUALS (type
) == type_quals
)
3056 /* Search the chain of variants to see if there is already one there just
3057 like the one we need to have. If so, use that existing one. We must
3058 preserve the TYPE_NAME, since there is code that depends on this. */
3059 for (t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
3060 if (check_qualified_type (t
, type
, type_quals
))
3066 /* Like get_qualified_type, but creates the type if it does not
3067 exist. This function never returns NULL_TREE. */
3070 build_qualified_type (tree type
, int type_quals
)
3074 /* See if we already have the appropriate qualified variant. */
3075 t
= get_qualified_type (type
, type_quals
);
3077 /* If not, build it. */
3080 t
= build_type_copy (type
);
3081 set_type_quals (t
, type_quals
);
3087 /* Create a new variant of TYPE, equivalent but distinct.
3088 This is so the caller can modify it. */
3091 build_type_copy (tree type
)
3093 tree t
, m
= TYPE_MAIN_VARIANT (type
);
3095 t
= copy_node (type
);
3097 TYPE_POINTER_TO (t
) = 0;
3098 TYPE_REFERENCE_TO (t
) = 0;
3100 /* Add this type to the chain of variants of TYPE. */
3101 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (m
);
3102 TYPE_NEXT_VARIANT (m
) = t
;
3107 /* Hashing of types so that we don't make duplicates.
3108 The entry point is `type_hash_canon'. */
3110 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
3111 with types in the TREE_VALUE slots), by adding the hash codes
3112 of the individual types. */
3115 type_hash_list (tree list
, hashval_t hashcode
)
3119 for (tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3120 if (TREE_VALUE (tail
) != error_mark_node
)
3121 hashcode
= iterative_hash_object (TYPE_HASH (TREE_VALUE (tail
)),
3127 /* These are the Hashtable callback functions. */
3129 /* Returns true iff the types are equivalent. */
3132 type_hash_eq (const void *va
, const void *vb
)
3134 const struct type_hash
*a
= va
, *b
= vb
;
3136 /* First test the things that are the same for all types. */
3137 if (a
->hash
!= b
->hash
3138 || TREE_CODE (a
->type
) != TREE_CODE (b
->type
)
3139 || TREE_TYPE (a
->type
) != TREE_TYPE (b
->type
)
3140 || !attribute_list_equal (TYPE_ATTRIBUTES (a
->type
),
3141 TYPE_ATTRIBUTES (b
->type
))
3142 || TYPE_ALIGN (a
->type
) != TYPE_ALIGN (b
->type
)
3143 || TYPE_MODE (a
->type
) != TYPE_MODE (b
->type
))
3146 switch (TREE_CODE (a
->type
))
3152 case REFERENCE_TYPE
:
3156 if (TYPE_VALUES (a
->type
) != TYPE_VALUES (b
->type
)
3157 && !(TYPE_VALUES (a
->type
)
3158 && TREE_CODE (TYPE_VALUES (a
->type
)) == TREE_LIST
3159 && TYPE_VALUES (b
->type
)
3160 && TREE_CODE (TYPE_VALUES (b
->type
)) == TREE_LIST
3161 && type_list_equal (TYPE_VALUES (a
->type
),
3162 TYPE_VALUES (b
->type
))))
3165 /* ... fall through ... */
3171 return ((TYPE_MAX_VALUE (a
->type
) == TYPE_MAX_VALUE (b
->type
)
3172 || tree_int_cst_equal (TYPE_MAX_VALUE (a
->type
),
3173 TYPE_MAX_VALUE (b
->type
)))
3174 && (TYPE_MIN_VALUE (a
->type
) == TYPE_MIN_VALUE (b
->type
)
3175 || tree_int_cst_equal (TYPE_MIN_VALUE (a
->type
),
3176 TYPE_MIN_VALUE (b
->type
))));
3179 return TYPE_OFFSET_BASETYPE (a
->type
) == TYPE_OFFSET_BASETYPE (b
->type
);
3182 return (TYPE_METHOD_BASETYPE (a
->type
) == TYPE_METHOD_BASETYPE (b
->type
)
3183 && (TYPE_ARG_TYPES (a
->type
) == TYPE_ARG_TYPES (b
->type
)
3184 || (TYPE_ARG_TYPES (a
->type
)
3185 && TREE_CODE (TYPE_ARG_TYPES (a
->type
)) == TREE_LIST
3186 && TYPE_ARG_TYPES (b
->type
)
3187 && TREE_CODE (TYPE_ARG_TYPES (b
->type
)) == TREE_LIST
3188 && type_list_equal (TYPE_ARG_TYPES (a
->type
),
3189 TYPE_ARG_TYPES (b
->type
)))));
3193 return TYPE_DOMAIN (a
->type
) == TYPE_DOMAIN (b
->type
);
3197 case QUAL_UNION_TYPE
:
3198 return (TYPE_FIELDS (a
->type
) == TYPE_FIELDS (b
->type
)
3199 || (TYPE_FIELDS (a
->type
)
3200 && TREE_CODE (TYPE_FIELDS (a
->type
)) == TREE_LIST
3201 && TYPE_FIELDS (b
->type
)
3202 && TREE_CODE (TYPE_FIELDS (b
->type
)) == TREE_LIST
3203 && type_list_equal (TYPE_FIELDS (a
->type
),
3204 TYPE_FIELDS (b
->type
))));
3207 return (TYPE_ARG_TYPES (a
->type
) == TYPE_ARG_TYPES (b
->type
)
3208 || (TYPE_ARG_TYPES (a
->type
)
3209 && TREE_CODE (TYPE_ARG_TYPES (a
->type
)) == TREE_LIST
3210 && TYPE_ARG_TYPES (b
->type
)
3211 && TREE_CODE (TYPE_ARG_TYPES (b
->type
)) == TREE_LIST
3212 && type_list_equal (TYPE_ARG_TYPES (a
->type
),
3213 TYPE_ARG_TYPES (b
->type
))));
3220 /* Return the cached hash value. */
3223 type_hash_hash (const void *item
)
3225 return ((const struct type_hash
*) item
)->hash
;
3228 /* Look in the type hash table for a type isomorphic to TYPE.
3229 If one is found, return it. Otherwise return 0. */
3232 type_hash_lookup (hashval_t hashcode
, tree type
)
3234 struct type_hash
*h
, in
;
3236 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
3237 must call that routine before comparing TYPE_ALIGNs. */
3243 h
= htab_find_with_hash (type_hash_table
, &in
, hashcode
);
3249 /* Add an entry to the type-hash-table
3250 for a type TYPE whose hash code is HASHCODE. */
3253 type_hash_add (hashval_t hashcode
, tree type
)
3255 struct type_hash
*h
;
3258 h
= ggc_alloc (sizeof (struct type_hash
));
3261 loc
= htab_find_slot_with_hash (type_hash_table
, h
, hashcode
, INSERT
);
3262 *(struct type_hash
**) loc
= h
;
3265 /* Given TYPE, and HASHCODE its hash code, return the canonical
3266 object for an identical type if one already exists.
3267 Otherwise, return TYPE, and record it as the canonical object.
3269 To use this function, first create a type of the sort you want.
3270 Then compute its hash code from the fields of the type that
3271 make it different from other similar types.
3272 Then call this function and use the value. */
3275 type_hash_canon (unsigned int hashcode
, tree type
)
3279 /* The hash table only contains main variants, so ensure that's what we're
3281 if (TYPE_MAIN_VARIANT (type
) != type
)
3284 if (!lang_hooks
.types
.hash_types
)
3287 /* See if the type is in the hash table already. If so, return it.
3288 Otherwise, add the type. */
3289 t1
= type_hash_lookup (hashcode
, type
);
3292 #ifdef GATHER_STATISTICS
3293 tree_node_counts
[(int) t_kind
]--;
3294 tree_node_sizes
[(int) t_kind
] -= sizeof (struct tree_type
);
3300 type_hash_add (hashcode
, type
);
3305 /* See if the data pointed to by the type hash table is marked. We consider
3306 it marked if the type is marked or if a debug type number or symbol
3307 table entry has been made for the type. This reduces the amount of
3308 debugging output and eliminates that dependency of the debug output on
3309 the number of garbage collections. */
3312 type_hash_marked_p (const void *p
)
3314 tree type
= ((struct type_hash
*) p
)->type
;
3316 return ggc_marked_p (type
) || TYPE_SYMTAB_POINTER (type
);
3320 print_type_hash_statistics (void)
3322 fprintf (stderr
, "Type hash: size %ld, %ld elements, %f collisions\n",
3323 (long) htab_size (type_hash_table
),
3324 (long) htab_elements (type_hash_table
),
3325 htab_collisions (type_hash_table
));
3328 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
3329 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
3330 by adding the hash codes of the individual attributes. */
3333 attribute_hash_list (tree list
, hashval_t hashcode
)
3337 for (tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3338 /* ??? Do we want to add in TREE_VALUE too? */
3339 hashcode
= iterative_hash_object
3340 (IDENTIFIER_HASH_VALUE (TREE_PURPOSE (tail
)), hashcode
);
3344 /* Given two lists of attributes, return true if list l2 is
3345 equivalent to l1. */
3348 attribute_list_equal (tree l1
, tree l2
)
3350 return attribute_list_contained (l1
, l2
)
3351 && attribute_list_contained (l2
, l1
);
3354 /* Given two lists of attributes, return true if list L2 is
3355 completely contained within L1. */
3356 /* ??? This would be faster if attribute names were stored in a canonicalized
3357 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
3358 must be used to show these elements are equivalent (which they are). */
3359 /* ??? It's not clear that attributes with arguments will always be handled
3363 attribute_list_contained (tree l1
, tree l2
)
3367 /* First check the obvious, maybe the lists are identical. */
3371 /* Maybe the lists are similar. */
3372 for (t1
= l1
, t2
= l2
;
3374 && TREE_PURPOSE (t1
) == TREE_PURPOSE (t2
)
3375 && TREE_VALUE (t1
) == TREE_VALUE (t2
);
3376 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
));
3378 /* Maybe the lists are equal. */
3379 if (t1
== 0 && t2
== 0)
3382 for (; t2
!= 0; t2
= TREE_CHAIN (t2
))
3385 for (attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)), l1
);
3387 attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)),
3390 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) == 1)
3397 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) != 1)
3404 /* Given two lists of types
3405 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
3406 return 1 if the lists contain the same types in the same order.
3407 Also, the TREE_PURPOSEs must match. */
3410 type_list_equal (tree l1
, tree l2
)
3414 for (t1
= l1
, t2
= l2
; t1
&& t2
; t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
3415 if (TREE_VALUE (t1
) != TREE_VALUE (t2
)
3416 || (TREE_PURPOSE (t1
) != TREE_PURPOSE (t2
)
3417 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1
), TREE_PURPOSE (t2
))
3418 && (TREE_TYPE (TREE_PURPOSE (t1
))
3419 == TREE_TYPE (TREE_PURPOSE (t2
))))))
3425 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
3426 given by TYPE. If the argument list accepts variable arguments,
3427 then this function counts only the ordinary arguments. */
3430 type_num_arguments (tree type
)
3435 for (t
= TYPE_ARG_TYPES (type
); t
; t
= TREE_CHAIN (t
))
3436 /* If the function does not take a variable number of arguments,
3437 the last element in the list will have type `void'. */
3438 if (VOID_TYPE_P (TREE_VALUE (t
)))
3446 /* Nonzero if integer constants T1 and T2
3447 represent the same constant value. */
3450 tree_int_cst_equal (tree t1
, tree t2
)
3455 if (t1
== 0 || t2
== 0)
3458 if (TREE_CODE (t1
) == INTEGER_CST
3459 && TREE_CODE (t2
) == INTEGER_CST
3460 && TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
3461 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
))
3467 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
3468 The precise way of comparison depends on their data type. */
3471 tree_int_cst_lt (tree t1
, tree t2
)
3476 if (TYPE_UNSIGNED (TREE_TYPE (t1
)) != TYPE_UNSIGNED (TREE_TYPE (t2
)))
3478 int t1_sgn
= tree_int_cst_sgn (t1
);
3479 int t2_sgn
= tree_int_cst_sgn (t2
);
3481 if (t1_sgn
< t2_sgn
)
3483 else if (t1_sgn
> t2_sgn
)
3485 /* Otherwise, both are non-negative, so we compare them as
3486 unsigned just in case one of them would overflow a signed
3489 else if (!TYPE_UNSIGNED (TREE_TYPE (t1
)))
3490 return INT_CST_LT (t1
, t2
);
3492 return INT_CST_LT_UNSIGNED (t1
, t2
);
3495 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
3498 tree_int_cst_compare (tree t1
, tree t2
)
3500 if (tree_int_cst_lt (t1
, t2
))
3502 else if (tree_int_cst_lt (t2
, t1
))
3508 /* Return 1 if T is an INTEGER_CST that can be manipulated efficiently on
3509 the host. If POS is zero, the value can be represented in a single
3510 HOST_WIDE_INT. If POS is nonzero, the value must be positive and can
3511 be represented in a single unsigned HOST_WIDE_INT. */
3514 host_integerp (tree t
, int pos
)
3516 return (TREE_CODE (t
) == INTEGER_CST
3517 && ! TREE_OVERFLOW (t
)
3518 && ((TREE_INT_CST_HIGH (t
) == 0
3519 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) >= 0)
3520 || (! pos
&& TREE_INT_CST_HIGH (t
) == -1
3521 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0
3522 && !TYPE_UNSIGNED (TREE_TYPE (t
)))
3523 || (pos
&& TREE_INT_CST_HIGH (t
) == 0)));
3526 /* Return the HOST_WIDE_INT least significant bits of T if it is an
3527 INTEGER_CST and there is no overflow. POS is nonzero if the result must
3528 be positive. Abort if we cannot satisfy the above conditions. */
3531 tree_low_cst (tree t
, int pos
)
3533 if (host_integerp (t
, pos
))
3534 return TREE_INT_CST_LOW (t
);
3539 /* Return the most significant bit of the integer constant T. */
3542 tree_int_cst_msb (tree t
)
3546 unsigned HOST_WIDE_INT l
;
3548 /* Note that using TYPE_PRECISION here is wrong. We care about the
3549 actual bits, not the (arbitrary) range of the type. */
3550 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t
))) - 1;
3551 rshift_double (TREE_INT_CST_LOW (t
), TREE_INT_CST_HIGH (t
), prec
,
3552 2 * HOST_BITS_PER_WIDE_INT
, &l
, &h
, 0);
3553 return (l
& 1) == 1;
3556 /* Return an indication of the sign of the integer constant T.
3557 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
3558 Note that -1 will never be returned it T's type is unsigned. */
3561 tree_int_cst_sgn (tree t
)
3563 if (TREE_INT_CST_LOW (t
) == 0 && TREE_INT_CST_HIGH (t
) == 0)
3565 else if (TYPE_UNSIGNED (TREE_TYPE (t
)))
3567 else if (TREE_INT_CST_HIGH (t
) < 0)
3573 /* Compare two constructor-element-type constants. Return 1 if the lists
3574 are known to be equal; otherwise return 0. */
3577 simple_cst_list_equal (tree l1
, tree l2
)
3579 while (l1
!= NULL_TREE
&& l2
!= NULL_TREE
)
3581 if (simple_cst_equal (TREE_VALUE (l1
), TREE_VALUE (l2
)) != 1)
3584 l1
= TREE_CHAIN (l1
);
3585 l2
= TREE_CHAIN (l2
);
3591 /* Return truthvalue of whether T1 is the same tree structure as T2.
3592 Return 1 if they are the same.
3593 Return 0 if they are understandably different.
3594 Return -1 if either contains tree structure not understood by
3598 simple_cst_equal (tree t1
, tree t2
)
3600 enum tree_code code1
, code2
;
3606 if (t1
== 0 || t2
== 0)
3609 code1
= TREE_CODE (t1
);
3610 code2
= TREE_CODE (t2
);
3612 if (code1
== NOP_EXPR
|| code1
== CONVERT_EXPR
|| code1
== NON_LVALUE_EXPR
)
3614 if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
3615 || code2
== NON_LVALUE_EXPR
)
3616 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3618 return simple_cst_equal (TREE_OPERAND (t1
, 0), t2
);
3621 else if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
3622 || code2
== NON_LVALUE_EXPR
)
3623 return simple_cst_equal (t1
, TREE_OPERAND (t2
, 0));
3631 return (TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
3632 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
));
3635 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3638 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3639 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3640 TREE_STRING_LENGTH (t1
)));
3643 return simple_cst_list_equal (CONSTRUCTOR_ELTS (t1
),
3644 CONSTRUCTOR_ELTS (t2
));
3647 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3650 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3654 simple_cst_list_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
3657 /* Special case: if either target is an unallocated VAR_DECL,
3658 it means that it's going to be unified with whatever the
3659 TARGET_EXPR is really supposed to initialize, so treat it
3660 as being equivalent to anything. */
3661 if ((TREE_CODE (TREE_OPERAND (t1
, 0)) == VAR_DECL
3662 && DECL_NAME (TREE_OPERAND (t1
, 0)) == NULL_TREE
3663 && !DECL_RTL_SET_P (TREE_OPERAND (t1
, 0)))
3664 || (TREE_CODE (TREE_OPERAND (t2
, 0)) == VAR_DECL
3665 && DECL_NAME (TREE_OPERAND (t2
, 0)) == NULL_TREE
3666 && !DECL_RTL_SET_P (TREE_OPERAND (t2
, 0))))
3669 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3674 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
3676 case WITH_CLEANUP_EXPR
:
3677 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3681 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t1
, 1));
3684 if (TREE_OPERAND (t1
, 1) == TREE_OPERAND (t2
, 1))
3685 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3699 /* This general rule works for most tree codes. All exceptions should be
3700 handled above. If this is a language-specific tree code, we can't
3701 trust what might be in the operand, so say we don't know
3703 if ((int) code1
>= (int) LAST_AND_UNUSED_TREE_CODE
)
3706 switch (TREE_CODE_CLASS (code1
))
3715 for (i
= 0; i
< TREE_CODE_LENGTH (code1
); i
++)
3717 cmp
= simple_cst_equal (TREE_OPERAND (t1
, i
), TREE_OPERAND (t2
, i
));
3729 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
3730 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
3731 than U, respectively. */
3734 compare_tree_int (tree t
, unsigned HOST_WIDE_INT u
)
3736 if (tree_int_cst_sgn (t
) < 0)
3738 else if (TREE_INT_CST_HIGH (t
) != 0)
3740 else if (TREE_INT_CST_LOW (t
) == u
)
3742 else if (TREE_INT_CST_LOW (t
) < u
)
3748 /* Return true if CODE represents an associative tree code. Otherwise
3751 associative_tree_code (enum tree_code code
)
3770 /* Return true if CODE represents an commutative tree code. Otherwise
3773 commutative_tree_code (enum tree_code code
)
3786 case UNORDERED_EXPR
:
3790 case TRUTH_AND_EXPR
:
3791 case TRUTH_XOR_EXPR
:
3801 /* Generate a hash value for an expression. This can be used iteratively
3802 by passing a previous result as the "val" argument.
3804 This function is intended to produce the same hash for expressions which
3805 would compare equal using operand_equal_p. */
3808 iterative_hash_expr (tree t
, hashval_t val
)
3811 enum tree_code code
;
3815 return iterative_hash_object (t
, val
);
3817 code
= TREE_CODE (t
);
3818 class = TREE_CODE_CLASS (code
);
3821 || TREE_CODE (t
) == VALUE_HANDLE
)
3823 /* Decls we can just compare by pointer. */
3824 val
= iterative_hash_object (t
, val
);
3826 else if (class == 'c')
3828 /* Alas, constants aren't shared, so we can't rely on pointer
3830 if (code
== INTEGER_CST
)
3832 val
= iterative_hash_object (TREE_INT_CST_LOW (t
), val
);
3833 val
= iterative_hash_object (TREE_INT_CST_HIGH (t
), val
);
3835 else if (code
== REAL_CST
)
3837 unsigned int val2
= real_hash (TREE_REAL_CST_PTR (t
));
3839 val
= iterative_hash (&val2
, sizeof (unsigned int), val
);
3841 else if (code
== STRING_CST
)
3842 val
= iterative_hash (TREE_STRING_POINTER (t
),
3843 TREE_STRING_LENGTH (t
), val
);
3844 else if (code
== COMPLEX_CST
)
3846 val
= iterative_hash_expr (TREE_REALPART (t
), val
);
3847 val
= iterative_hash_expr (TREE_IMAGPART (t
), val
);
3849 else if (code
== VECTOR_CST
)
3850 val
= iterative_hash_expr (TREE_VECTOR_CST_ELTS (t
), val
);
3854 else if (IS_EXPR_CODE_CLASS (class))
3856 val
= iterative_hash_object (code
, val
);
3858 /* Don't hash the type, that can lead to having nodes which
3859 compare equal according to operand_equal_p, but which
3860 have different hash codes. */
3861 if (code
== NOP_EXPR
3862 || code
== CONVERT_EXPR
3863 || code
== NON_LVALUE_EXPR
)
3865 /* Make sure to include signness in the hash computation. */
3866 val
+= TYPE_UNSIGNED (TREE_TYPE (t
));
3867 val
= iterative_hash_expr (TREE_OPERAND (t
, 0), val
);
3870 if (commutative_tree_code (code
))
3872 /* It's a commutative expression. We want to hash it the same
3873 however it appears. We do this by first hashing both operands
3874 and then rehashing based on the order of their independent
3876 hashval_t one
= iterative_hash_expr (TREE_OPERAND (t
, 0), 0);
3877 hashval_t two
= iterative_hash_expr (TREE_OPERAND (t
, 1), 0);
3881 t
= one
, one
= two
, two
= t
;
3883 val
= iterative_hash_object (one
, val
);
3884 val
= iterative_hash_object (two
, val
);
3887 for (i
= first_rtl_op (code
) - 1; i
>= 0; --i
)
3888 val
= iterative_hash_expr (TREE_OPERAND (t
, i
), val
);
3890 else if (code
== TREE_LIST
)
3892 /* A list of expressions, for a CALL_EXPR or as the elements of a
3894 for (; t
; t
= TREE_CHAIN (t
))
3895 val
= iterative_hash_expr (TREE_VALUE (t
), val
);
3897 else if (code
== SSA_NAME
)
3899 val
= iterative_hash_object (SSA_NAME_VERSION (t
), val
);
3900 val
= iterative_hash_expr (SSA_NAME_VAR (t
), val
);
3908 /* Constructors for pointer, array and function types.
3909 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
3910 constructed by language-dependent code, not here.) */
3912 /* Construct, lay out and return the type of pointers to TO_TYPE with
3913 mode MODE. If CAN_ALIAS_ALL is TRUE, indicate this type can
3914 reference all of memory. If such a type has already been
3915 constructed, reuse it. */
3918 build_pointer_type_for_mode (tree to_type
, enum machine_mode mode
,
3923 /* In some cases, languages will have things that aren't a POINTER_TYPE
3924 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_POINTER_TO.
3925 In that case, return that type without regard to the rest of our
3928 ??? This is a kludge, but consistent with the way this function has
3929 always operated and there doesn't seem to be a good way to avoid this
3931 if (TYPE_POINTER_TO (to_type
) != 0
3932 && TREE_CODE (TYPE_POINTER_TO (to_type
)) != POINTER_TYPE
)
3933 return TYPE_POINTER_TO (to_type
);
3935 /* First, if we already have a type for pointers to TO_TYPE and it's
3936 the proper mode, use it. */
3937 for (t
= TYPE_POINTER_TO (to_type
); t
; t
= TYPE_NEXT_PTR_TO (t
))
3938 if (TYPE_MODE (t
) == mode
&& TYPE_REF_CAN_ALIAS_ALL (t
) == can_alias_all
)
3941 t
= make_node (POINTER_TYPE
);
3943 TREE_TYPE (t
) = to_type
;
3944 TYPE_MODE (t
) = mode
;
3945 TYPE_REF_CAN_ALIAS_ALL (t
) = can_alias_all
;
3946 TYPE_NEXT_PTR_TO (t
) = TYPE_POINTER_TO (to_type
);
3947 TYPE_POINTER_TO (to_type
) = t
;
3949 /* Lay out the type. This function has many callers that are concerned
3950 with expression-construction, and this simplifies them all. */
3956 /* By default build pointers in ptr_mode. */
3959 build_pointer_type (tree to_type
)
3961 return build_pointer_type_for_mode (to_type
, ptr_mode
, false);
3964 /* Same as build_pointer_type_for_mode, but for REFERENCE_TYPE. */
3967 build_reference_type_for_mode (tree to_type
, enum machine_mode mode
,
3972 /* In some cases, languages will have things that aren't a REFERENCE_TYPE
3973 (such as a RECORD_TYPE for fat pointers in Ada) as TYPE_REFERENCE_TO.
3974 In that case, return that type without regard to the rest of our
3977 ??? This is a kludge, but consistent with the way this function has
3978 always operated and there doesn't seem to be a good way to avoid this
3980 if (TYPE_REFERENCE_TO (to_type
) != 0
3981 && TREE_CODE (TYPE_REFERENCE_TO (to_type
)) != REFERENCE_TYPE
)
3982 return TYPE_REFERENCE_TO (to_type
);
3984 /* First, if we already have a type for pointers to TO_TYPE and it's
3985 the proper mode, use it. */
3986 for (t
= TYPE_REFERENCE_TO (to_type
); t
; t
= TYPE_NEXT_REF_TO (t
))
3987 if (TYPE_MODE (t
) == mode
&& TYPE_REF_CAN_ALIAS_ALL (t
) == can_alias_all
)
3990 t
= make_node (REFERENCE_TYPE
);
3992 TREE_TYPE (t
) = to_type
;
3993 TYPE_MODE (t
) = mode
;
3994 TYPE_REF_CAN_ALIAS_ALL (t
) = can_alias_all
;
3995 TYPE_NEXT_REF_TO (t
) = TYPE_REFERENCE_TO (to_type
);
3996 TYPE_REFERENCE_TO (to_type
) = t
;
4004 /* Build the node for the type of references-to-TO_TYPE by default
4008 build_reference_type (tree to_type
)
4010 return build_reference_type_for_mode (to_type
, ptr_mode
, false);
4013 /* Build a type that is compatible with t but has no cv quals anywhere
4016 const char *const *const * -> char ***. */
4019 build_type_no_quals (tree t
)
4021 switch (TREE_CODE (t
))
4024 return build_pointer_type_for_mode (build_type_no_quals (TREE_TYPE (t
)),
4026 TYPE_REF_CAN_ALIAS_ALL (t
));
4027 case REFERENCE_TYPE
:
4029 build_reference_type_for_mode (build_type_no_quals (TREE_TYPE (t
)),
4031 TYPE_REF_CAN_ALIAS_ALL (t
));
4033 return TYPE_MAIN_VARIANT (t
);
4037 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
4038 MAXVAL should be the maximum value in the domain
4039 (one less than the length of the array).
4041 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
4042 We don't enforce this limit, that is up to caller (e.g. language front end).
4043 The limit exists because the result is a signed type and we don't handle
4044 sizes that use more than one HOST_WIDE_INT. */
4047 build_index_type (tree maxval
)
4049 tree itype
= make_node (INTEGER_TYPE
);
4051 TREE_TYPE (itype
) = sizetype
;
4052 TYPE_PRECISION (itype
) = TYPE_PRECISION (sizetype
);
4053 TYPE_MIN_VALUE (itype
) = size_zero_node
;
4054 TYPE_MAX_VALUE (itype
) = convert (sizetype
, maxval
);
4055 TYPE_MODE (itype
) = TYPE_MODE (sizetype
);
4056 TYPE_SIZE (itype
) = TYPE_SIZE (sizetype
);
4057 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (sizetype
);
4058 TYPE_ALIGN (itype
) = TYPE_ALIGN (sizetype
);
4059 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (sizetype
);
4061 if (host_integerp (maxval
, 1))
4062 return type_hash_canon (tree_low_cst (maxval
, 1), itype
);
4067 /* Builds a signed or unsigned integer type of precision PRECISION.
4068 Used for C bitfields whose precision does not match that of
4069 built-in target types. */
4071 build_nonstandard_integer_type (unsigned HOST_WIDE_INT precision
,
4074 tree itype
= make_node (INTEGER_TYPE
);
4076 TYPE_PRECISION (itype
) = precision
;
4079 fixup_unsigned_type (itype
);
4081 fixup_signed_type (itype
);
4083 if (host_integerp (TYPE_MAX_VALUE (itype
), 1))
4084 return type_hash_canon (tree_low_cst (TYPE_MAX_VALUE (itype
), 1), itype
);
4089 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
4090 ENUMERAL_TYPE, BOOLEAN_TYPE, or CHAR_TYPE), with
4091 low bound LOWVAL and high bound HIGHVAL.
4092 if TYPE==NULL_TREE, sizetype is used. */
4095 build_range_type (tree type
, tree lowval
, tree highval
)
4097 tree itype
= make_node (INTEGER_TYPE
);
4099 TREE_TYPE (itype
) = type
;
4100 if (type
== NULL_TREE
)
4103 TYPE_MIN_VALUE (itype
) = convert (type
, lowval
);
4104 TYPE_MAX_VALUE (itype
) = highval
? convert (type
, highval
) : NULL
;
4106 TYPE_PRECISION (itype
) = TYPE_PRECISION (type
);
4107 TYPE_MODE (itype
) = TYPE_MODE (type
);
4108 TYPE_SIZE (itype
) = TYPE_SIZE (type
);
4109 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (type
);
4110 TYPE_ALIGN (itype
) = TYPE_ALIGN (type
);
4111 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (type
);
4113 if (host_integerp (lowval
, 0) && highval
!= 0 && host_integerp (highval
, 0))
4114 return type_hash_canon (tree_low_cst (highval
, 0)
4115 - tree_low_cst (lowval
, 0),
4121 /* Just like build_index_type, but takes lowval and highval instead
4122 of just highval (maxval). */
4125 build_index_2_type (tree lowval
, tree highval
)
4127 return build_range_type (sizetype
, lowval
, highval
);
4130 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
4131 and number of elements specified by the range of values of INDEX_TYPE.
4132 If such a type has already been constructed, reuse it. */
4135 build_array_type (tree elt_type
, tree index_type
)
4138 hashval_t hashcode
= 0;
4140 if (TREE_CODE (elt_type
) == FUNCTION_TYPE
)
4142 error ("arrays of functions are not meaningful");
4143 elt_type
= integer_type_node
;
4146 t
= make_node (ARRAY_TYPE
);
4147 TREE_TYPE (t
) = elt_type
;
4148 TYPE_DOMAIN (t
) = index_type
;
4150 if (index_type
== 0)
4153 hashcode
= iterative_hash_object (TYPE_HASH (elt_type
), hashcode
);
4154 hashcode
= iterative_hash_object (TYPE_HASH (index_type
), hashcode
);
4155 t
= type_hash_canon (hashcode
, t
);
4157 if (!COMPLETE_TYPE_P (t
))
4162 /* Return the TYPE of the elements comprising
4163 the innermost dimension of ARRAY. */
4166 get_inner_array_type (tree array
)
4168 tree type
= TREE_TYPE (array
);
4170 while (TREE_CODE (type
) == ARRAY_TYPE
)
4171 type
= TREE_TYPE (type
);
4176 /* Construct, lay out and return
4177 the type of functions returning type VALUE_TYPE
4178 given arguments of types ARG_TYPES.
4179 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
4180 are data type nodes for the arguments of the function.
4181 If such a type has already been constructed, reuse it. */
4184 build_function_type (tree value_type
, tree arg_types
)
4187 hashval_t hashcode
= 0;
4189 if (TREE_CODE (value_type
) == FUNCTION_TYPE
)
4191 error ("function return type cannot be function");
4192 value_type
= integer_type_node
;
4195 /* Make a node of the sort we want. */
4196 t
= make_node (FUNCTION_TYPE
);
4197 TREE_TYPE (t
) = value_type
;
4198 TYPE_ARG_TYPES (t
) = arg_types
;
4200 /* If we already have such a type, use the old one. */
4201 hashcode
= iterative_hash_object (TYPE_HASH (value_type
), hashcode
);
4202 hashcode
= type_hash_list (arg_types
, hashcode
);
4203 t
= type_hash_canon (hashcode
, t
);
4205 if (!COMPLETE_TYPE_P (t
))
4210 /* Build a function type. The RETURN_TYPE is the type returned by the
4211 function. If additional arguments are provided, they are
4212 additional argument types. The list of argument types must always
4213 be terminated by NULL_TREE. */
4216 build_function_type_list (tree return_type
, ...)
4221 va_start (p
, return_type
);
4223 t
= va_arg (p
, tree
);
4224 for (args
= NULL_TREE
; t
!= NULL_TREE
; t
= va_arg (p
, tree
))
4225 args
= tree_cons (NULL_TREE
, t
, args
);
4228 args
= nreverse (args
);
4229 TREE_CHAIN (last
) = void_list_node
;
4230 args
= build_function_type (return_type
, args
);
4236 /* Build a METHOD_TYPE for a member of BASETYPE. The RETTYPE (a TYPE)
4237 and ARGTYPES (a TREE_LIST) are the return type and arguments types
4238 for the method. An implicit additional parameter (of type
4239 pointer-to-BASETYPE) is added to the ARGTYPES. */
4242 build_method_type_directly (tree basetype
,
4250 /* Make a node of the sort we want. */
4251 t
= make_node (METHOD_TYPE
);
4253 TYPE_METHOD_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
4254 TREE_TYPE (t
) = rettype
;
4255 ptype
= build_pointer_type (basetype
);
4257 /* The actual arglist for this function includes a "hidden" argument
4258 which is "this". Put it into the list of argument types. */
4259 argtypes
= tree_cons (NULL_TREE
, ptype
, argtypes
);
4260 TYPE_ARG_TYPES (t
) = argtypes
;
4262 /* If we already have such a type, use the old one. */
4263 hashcode
= iterative_hash_object (TYPE_HASH (basetype
), hashcode
);
4264 hashcode
= iterative_hash_object (TYPE_HASH (rettype
), hashcode
);
4265 hashcode
= type_hash_list (argtypes
, hashcode
);
4266 t
= type_hash_canon (hashcode
, t
);
4268 if (!COMPLETE_TYPE_P (t
))
4274 /* Construct, lay out and return the type of methods belonging to class
4275 BASETYPE and whose arguments and values are described by TYPE.
4276 If that type exists already, reuse it.
4277 TYPE must be a FUNCTION_TYPE node. */
4280 build_method_type (tree basetype
, tree type
)
4282 if (TREE_CODE (type
) != FUNCTION_TYPE
)
4285 return build_method_type_directly (basetype
,
4287 TYPE_ARG_TYPES (type
));
4290 /* Construct, lay out and return the type of offsets to a value
4291 of type TYPE, within an object of type BASETYPE.
4292 If a suitable offset type exists already, reuse it. */
4295 build_offset_type (tree basetype
, tree type
)
4298 hashval_t hashcode
= 0;
4300 /* Make a node of the sort we want. */
4301 t
= make_node (OFFSET_TYPE
);
4303 TYPE_OFFSET_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
4304 TREE_TYPE (t
) = type
;
4306 /* If we already have such a type, use the old one. */
4307 hashcode
= iterative_hash_object (TYPE_HASH (basetype
), hashcode
);
4308 hashcode
= iterative_hash_object (TYPE_HASH (type
), hashcode
);
4309 t
= type_hash_canon (hashcode
, t
);
4311 if (!COMPLETE_TYPE_P (t
))
4317 /* Create a complex type whose components are COMPONENT_TYPE. */
4320 build_complex_type (tree component_type
)
4325 /* Make a node of the sort we want. */
4326 t
= make_node (COMPLEX_TYPE
);
4328 TREE_TYPE (t
) = TYPE_MAIN_VARIANT (component_type
);
4330 /* If we already have such a type, use the old one. */
4331 hashcode
= iterative_hash_object (TYPE_HASH (component_type
), 0);
4332 t
= type_hash_canon (hashcode
, t
);
4334 if (!COMPLETE_TYPE_P (t
))
4337 /* If we are writing Dwarf2 output we need to create a name,
4338 since complex is a fundamental type. */
4339 if ((write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
4343 if (component_type
== char_type_node
)
4344 name
= "complex char";
4345 else if (component_type
== signed_char_type_node
)
4346 name
= "complex signed char";
4347 else if (component_type
== unsigned_char_type_node
)
4348 name
= "complex unsigned char";
4349 else if (component_type
== short_integer_type_node
)
4350 name
= "complex short int";
4351 else if (component_type
== short_unsigned_type_node
)
4352 name
= "complex short unsigned int";
4353 else if (component_type
== integer_type_node
)
4354 name
= "complex int";
4355 else if (component_type
== unsigned_type_node
)
4356 name
= "complex unsigned int";
4357 else if (component_type
== long_integer_type_node
)
4358 name
= "complex long int";
4359 else if (component_type
== long_unsigned_type_node
)
4360 name
= "complex long unsigned int";
4361 else if (component_type
== long_long_integer_type_node
)
4362 name
= "complex long long int";
4363 else if (component_type
== long_long_unsigned_type_node
)
4364 name
= "complex long long unsigned int";
4369 TYPE_NAME (t
) = get_identifier (name
);
4372 return build_qualified_type (t
, TYPE_QUALS (component_type
));
4375 /* Return OP, stripped of any conversions to wider types as much as is safe.
4376 Converting the value back to OP's type makes a value equivalent to OP.
4378 If FOR_TYPE is nonzero, we return a value which, if converted to
4379 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
4381 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
4382 narrowest type that can hold the value, even if they don't exactly fit.
4383 Otherwise, bit-field references are changed to a narrower type
4384 only if they can be fetched directly from memory in that type.
4386 OP must have integer, real or enumeral type. Pointers are not allowed!
4388 There are some cases where the obvious value we could return
4389 would regenerate to OP if converted to OP's type,
4390 but would not extend like OP to wider types.
4391 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
4392 For example, if OP is (unsigned short)(signed char)-1,
4393 we avoid returning (signed char)-1 if FOR_TYPE is int,
4394 even though extending that to an unsigned short would regenerate OP,
4395 since the result of extending (signed char)-1 to (int)
4396 is different from (int) OP. */
4399 get_unwidened (tree op
, tree for_type
)
4401 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
4402 tree type
= TREE_TYPE (op
);
4404 = TYPE_PRECISION (for_type
!= 0 ? for_type
: type
);
4406 = (for_type
!= 0 && for_type
!= type
4407 && final_prec
> TYPE_PRECISION (type
)
4408 && TYPE_UNSIGNED (type
));
4411 while (TREE_CODE (op
) == NOP_EXPR
)
4414 = TYPE_PRECISION (TREE_TYPE (op
))
4415 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0)));
4417 /* Truncations are many-one so cannot be removed.
4418 Unless we are later going to truncate down even farther. */
4420 && final_prec
> TYPE_PRECISION (TREE_TYPE (op
)))
4423 /* See what's inside this conversion. If we decide to strip it,
4425 op
= TREE_OPERAND (op
, 0);
4427 /* If we have not stripped any zero-extensions (uns is 0),
4428 we can strip any kind of extension.
4429 If we have previously stripped a zero-extension,
4430 only zero-extensions can safely be stripped.
4431 Any extension can be stripped if the bits it would produce
4432 are all going to be discarded later by truncating to FOR_TYPE. */
4436 if (! uns
|| final_prec
<= TYPE_PRECISION (TREE_TYPE (op
)))
4438 /* TYPE_UNSIGNED says whether this is a zero-extension.
4439 Let's avoid computing it if it does not affect WIN
4440 and if UNS will not be needed again. */
4441 if ((uns
|| TREE_CODE (op
) == NOP_EXPR
)
4442 && TYPE_UNSIGNED (TREE_TYPE (op
)))
4450 if (TREE_CODE (op
) == COMPONENT_REF
4451 /* Since type_for_size always gives an integer type. */
4452 && TREE_CODE (type
) != REAL_TYPE
4453 /* Don't crash if field not laid out yet. */
4454 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
4455 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
4457 unsigned int innerprec
4458 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
4459 int unsignedp
= (DECL_UNSIGNED (TREE_OPERAND (op
, 1))
4460 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op
, 1))));
4461 type
= lang_hooks
.types
.type_for_size (innerprec
, unsignedp
);
4463 /* We can get this structure field in the narrowest type it fits in.
4464 If FOR_TYPE is 0, do this only for a field that matches the
4465 narrower type exactly and is aligned for it
4466 The resulting extension to its nominal type (a fullword type)
4467 must fit the same conditions as for other extensions. */
4470 && INT_CST_LT_UNSIGNED (TYPE_SIZE (type
), TYPE_SIZE (TREE_TYPE (op
)))
4471 && (for_type
|| ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1)))
4472 && (! uns
|| final_prec
<= innerprec
|| unsignedp
))
4474 win
= build3 (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
4475 TREE_OPERAND (op
, 1), NULL_TREE
);
4476 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
4477 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
4484 /* Return OP or a simpler expression for a narrower value
4485 which can be sign-extended or zero-extended to give back OP.
4486 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
4487 or 0 if the value should be sign-extended. */
4490 get_narrower (tree op
, int *unsignedp_ptr
)
4495 bool integral_p
= INTEGRAL_TYPE_P (TREE_TYPE (op
));
4497 while (TREE_CODE (op
) == NOP_EXPR
)
4500 = (TYPE_PRECISION (TREE_TYPE (op
))
4501 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0))));
4503 /* Truncations are many-one so cannot be removed. */
4507 /* See what's inside this conversion. If we decide to strip it,
4512 op
= TREE_OPERAND (op
, 0);
4513 /* An extension: the outermost one can be stripped,
4514 but remember whether it is zero or sign extension. */
4516 uns
= TYPE_UNSIGNED (TREE_TYPE (op
));
4517 /* Otherwise, if a sign extension has been stripped,
4518 only sign extensions can now be stripped;
4519 if a zero extension has been stripped, only zero-extensions. */
4520 else if (uns
!= TYPE_UNSIGNED (TREE_TYPE (op
)))
4524 else /* bitschange == 0 */
4526 /* A change in nominal type can always be stripped, but we must
4527 preserve the unsignedness. */
4529 uns
= TYPE_UNSIGNED (TREE_TYPE (op
));
4531 op
= TREE_OPERAND (op
, 0);
4532 /* Keep trying to narrow, but don't assign op to win if it
4533 would turn an integral type into something else. */
4534 if (INTEGRAL_TYPE_P (TREE_TYPE (op
)) != integral_p
)
4541 if (TREE_CODE (op
) == COMPONENT_REF
4542 /* Since type_for_size always gives an integer type. */
4543 && TREE_CODE (TREE_TYPE (op
)) != REAL_TYPE
4544 /* Ensure field is laid out already. */
4545 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
4546 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
4548 unsigned HOST_WIDE_INT innerprec
4549 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
4550 int unsignedp
= (DECL_UNSIGNED (TREE_OPERAND (op
, 1))
4551 || TYPE_UNSIGNED (TREE_TYPE (TREE_OPERAND (op
, 1))));
4552 tree type
= lang_hooks
.types
.type_for_size (innerprec
, unsignedp
);
4554 /* We can get this structure field in a narrower type that fits it,
4555 but the resulting extension to its nominal type (a fullword type)
4556 must satisfy the same conditions as for other extensions.
4558 Do this only for fields that are aligned (not bit-fields),
4559 because when bit-field insns will be used there is no
4560 advantage in doing this. */
4562 if (innerprec
< TYPE_PRECISION (TREE_TYPE (op
))
4563 && ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1))
4564 && (first
|| uns
== DECL_UNSIGNED (TREE_OPERAND (op
, 1)))
4568 uns
= DECL_UNSIGNED (TREE_OPERAND (op
, 1));
4569 win
= build3 (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
4570 TREE_OPERAND (op
, 1), NULL_TREE
);
4571 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
4572 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
4575 *unsignedp_ptr
= uns
;
4579 /* Nonzero if integer constant C has a value that is permissible
4580 for type TYPE (an INTEGER_TYPE). */
4583 int_fits_type_p (tree c
, tree type
)
4585 tree type_low_bound
= TYPE_MIN_VALUE (type
);
4586 tree type_high_bound
= TYPE_MAX_VALUE (type
);
4587 int ok_for_low_bound
, ok_for_high_bound
;
4589 /* Perform some generic filtering first, which may allow making a decision
4590 even if the bounds are not constant. First, negative integers never fit
4591 in unsigned types, */
4592 if ((TYPE_UNSIGNED (type
) && tree_int_cst_sgn (c
) < 0)
4593 /* Also, unsigned integers with top bit set never fit signed types. */
4594 || (! TYPE_UNSIGNED (type
)
4595 && TYPE_UNSIGNED (TREE_TYPE (c
)) && tree_int_cst_msb (c
)))
4598 /* If at least one bound of the type is a constant integer, we can check
4599 ourselves and maybe make a decision. If no such decision is possible, but
4600 this type is a subtype, try checking against that. Otherwise, use
4601 force_fit_type, which checks against the precision.
4603 Compute the status for each possibly constant bound, and return if we see
4604 one does not match. Use ok_for_xxx_bound for this purpose, assigning -1
4605 for "unknown if constant fits", 0 for "constant known *not* to fit" and 1
4606 for "constant known to fit". */
4608 ok_for_low_bound
= -1;
4609 ok_for_high_bound
= -1;
4611 /* Check if C >= type_low_bound. */
4612 if (type_low_bound
&& TREE_CODE (type_low_bound
) == INTEGER_CST
)
4614 ok_for_low_bound
= ! tree_int_cst_lt (c
, type_low_bound
);
4615 if (! ok_for_low_bound
)
4619 /* Check if c <= type_high_bound. */
4620 if (type_high_bound
&& TREE_CODE (type_high_bound
) == INTEGER_CST
)
4622 ok_for_high_bound
= ! tree_int_cst_lt (type_high_bound
, c
);
4623 if (! ok_for_high_bound
)
4627 /* If the constant fits both bounds, the result is known. */
4628 if (ok_for_low_bound
== 1 && ok_for_high_bound
== 1)
4631 /* If we haven't been able to decide at this point, there nothing more we
4632 can check ourselves here. Look at the base type if we have one. */
4633 else if (TREE_CODE (type
) == INTEGER_TYPE
&& TREE_TYPE (type
) != 0)
4634 return int_fits_type_p (c
, TREE_TYPE (type
));
4636 /* Or to force_fit_type, if nothing else. */
4640 TREE_TYPE (c
) = type
;
4641 c
= force_fit_type (c
, -1, false, false);
4642 return !TREE_OVERFLOW (c
);
4646 /* Subprogram of following function. Called by walk_tree.
4648 Return *TP if it is an automatic variable or parameter of the
4649 function passed in as DATA. */
4652 find_var_from_fn (tree
*tp
, int *walk_subtrees
, void *data
)
4654 tree fn
= (tree
) data
;
4659 else if (DECL_P (*tp
) && lang_hooks
.tree_inlining
.auto_var_in_fn_p (*tp
, fn
))
4665 /* Returns true if T is, contains, or refers to a type with variable
4666 size. If FN is nonzero, only return true if a modifier of the type
4667 or position of FN is a variable or parameter inside FN.
4669 This concept is more general than that of C99 'variably modified types':
4670 in C99, a struct type is never variably modified because a VLA may not
4671 appear as a structure member. However, in GNU C code like:
4673 struct S { int i[f()]; };
4675 is valid, and other languages may define similar constructs. */
4678 variably_modified_type_p (tree type
, tree fn
)
4682 /* Test if T is either variable (if FN is zero) or an expression containing
4683 a variable in FN. */
4684 #define RETURN_TRUE_IF_VAR(T) \
4685 do { tree _t = (T); \
4686 if (_t && _t != error_mark_node && TREE_CODE (_t) != INTEGER_CST \
4687 && (!fn || walk_tree (&_t, find_var_from_fn, fn, NULL))) \
4688 return true; } while (0)
4690 if (type
== error_mark_node
)
4693 /* If TYPE itself has variable size, it is variably modified.
4695 We do not yet have a representation of the C99 '[*]' syntax.
4696 When a representation is chosen, this function should be modified
4697 to test for that case as well. */
4698 RETURN_TRUE_IF_VAR (TYPE_SIZE (type
));
4699 RETURN_TRUE_IF_VAR (TYPE_SIZE_UNIT(type
));
4701 switch (TREE_CODE (type
))
4704 case REFERENCE_TYPE
:
4708 if (variably_modified_type_p (TREE_TYPE (type
), fn
))
4714 /* If TYPE is a function type, it is variably modified if any of the
4715 parameters or the return type are variably modified. */
4716 if (variably_modified_type_p (TREE_TYPE (type
), fn
))
4719 for (t
= TYPE_ARG_TYPES (type
);
4720 t
&& t
!= void_list_node
;
4722 if (variably_modified_type_p (TREE_VALUE (t
), fn
))
4731 /* Scalar types are variably modified if their end points
4733 RETURN_TRUE_IF_VAR (TYPE_MIN_VALUE (type
));
4734 RETURN_TRUE_IF_VAR (TYPE_MAX_VALUE (type
));
4739 case QUAL_UNION_TYPE
:
4740 /* We can't see if any of the field are variably-modified by the
4741 definition we normally use, since that would produce infinite
4742 recursion via pointers. */
4743 /* This is variably modified if some field's type is. */
4744 for (t
= TYPE_FIELDS (type
); t
; t
= TREE_CHAIN (t
))
4745 if (TREE_CODE (t
) == FIELD_DECL
)
4747 RETURN_TRUE_IF_VAR (DECL_FIELD_OFFSET (t
));
4748 RETURN_TRUE_IF_VAR (DECL_SIZE (t
));
4749 RETURN_TRUE_IF_VAR (DECL_SIZE_UNIT (t
));
4751 if (TREE_CODE (type
) == QUAL_UNION_TYPE
)
4752 RETURN_TRUE_IF_VAR (DECL_QUALIFIER (t
));
4760 /* The current language may have other cases to check, but in general,
4761 all other types are not variably modified. */
4762 return lang_hooks
.tree_inlining
.var_mod_type_p (type
, fn
);
4764 #undef RETURN_TRUE_IF_VAR
4767 /* Given a DECL or TYPE, return the scope in which it was declared, or
4768 NULL_TREE if there is no containing scope. */
4771 get_containing_scope (tree t
)
4773 return (TYPE_P (t
) ? TYPE_CONTEXT (t
) : DECL_CONTEXT (t
));
4776 /* Return the innermost context enclosing DECL that is
4777 a FUNCTION_DECL, or zero if none. */
4780 decl_function_context (tree decl
)
4784 if (TREE_CODE (decl
) == ERROR_MARK
)
4787 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
4788 where we look up the function at runtime. Such functions always take
4789 a first argument of type 'pointer to real context'.
4791 C++ should really be fixed to use DECL_CONTEXT for the real context,
4792 and use something else for the "virtual context". */
4793 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_VINDEX (decl
))
4796 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl
)))));
4798 context
= DECL_CONTEXT (decl
);
4800 while (context
&& TREE_CODE (context
) != FUNCTION_DECL
)
4802 if (TREE_CODE (context
) == BLOCK
)
4803 context
= BLOCK_SUPERCONTEXT (context
);
4805 context
= get_containing_scope (context
);
4811 /* Return the innermost context enclosing DECL that is
4812 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
4813 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
4816 decl_type_context (tree decl
)
4818 tree context
= DECL_CONTEXT (decl
);
4821 switch (TREE_CODE (context
))
4823 case NAMESPACE_DECL
:
4824 case TRANSLATION_UNIT_DECL
:
4829 case QUAL_UNION_TYPE
:
4834 context
= DECL_CONTEXT (context
);
4838 context
= BLOCK_SUPERCONTEXT (context
);
4848 /* CALL is a CALL_EXPR. Return the declaration for the function
4849 called, or NULL_TREE if the called function cannot be
4853 get_callee_fndecl (tree call
)
4857 /* It's invalid to call this function with anything but a
4859 if (TREE_CODE (call
) != CALL_EXPR
)
4862 /* The first operand to the CALL is the address of the function
4864 addr
= TREE_OPERAND (call
, 0);
4868 /* If this is a readonly function pointer, extract its initial value. */
4869 if (DECL_P (addr
) && TREE_CODE (addr
) != FUNCTION_DECL
4870 && TREE_READONLY (addr
) && ! TREE_THIS_VOLATILE (addr
)
4871 && DECL_INITIAL (addr
))
4872 addr
= DECL_INITIAL (addr
);
4874 /* If the address is just `&f' for some function `f', then we know
4875 that `f' is being called. */
4876 if (TREE_CODE (addr
) == ADDR_EXPR
4877 && TREE_CODE (TREE_OPERAND (addr
, 0)) == FUNCTION_DECL
)
4878 return TREE_OPERAND (addr
, 0);
4880 /* We couldn't figure out what was being called. Maybe the front
4881 end has some idea. */
4882 return lang_hooks
.lang_get_callee_fndecl (call
);
4885 /* Print debugging information about tree nodes generated during the compile,
4886 and any language-specific information. */
4889 dump_tree_statistics (void)
4891 #ifdef GATHER_STATISTICS
4893 int total_nodes
, total_bytes
;
4896 fprintf (stderr
, "\n??? tree nodes created\n\n");
4897 #ifdef GATHER_STATISTICS
4898 fprintf (stderr
, "Kind Nodes Bytes\n");
4899 fprintf (stderr
, "---------------------------------------\n");
4900 total_nodes
= total_bytes
= 0;
4901 for (i
= 0; i
< (int) all_kinds
; i
++)
4903 fprintf (stderr
, "%-20s %7d %10d\n", tree_node_kind_names
[i
],
4904 tree_node_counts
[i
], tree_node_sizes
[i
]);
4905 total_nodes
+= tree_node_counts
[i
];
4906 total_bytes
+= tree_node_sizes
[i
];
4908 fprintf (stderr
, "---------------------------------------\n");
4909 fprintf (stderr
, "%-20s %7d %10d\n", "Total", total_nodes
, total_bytes
);
4910 fprintf (stderr
, "---------------------------------------\n");
4911 ssanames_print_statistics ();
4912 phinodes_print_statistics ();
4914 fprintf (stderr
, "(No per-node statistics)\n");
4916 print_type_hash_statistics ();
4917 lang_hooks
.print_statistics ();
4920 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
4922 /* Generate a crc32 of a string. */
4925 crc32_string (unsigned chksum
, const char *string
)
4929 unsigned value
= *string
<< 24;
4932 for (ix
= 8; ix
--; value
<<= 1)
4936 feedback
= (value
^ chksum
) & 0x80000000 ? 0x04c11db7 : 0;
4945 /* P is a string that will be used in a symbol. Mask out any characters
4946 that are not valid in that context. */
4949 clean_symbol_name (char *p
)
4953 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
4956 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
4963 /* Generate a name for a function unique to this translation unit.
4964 TYPE is some string to identify the purpose of this function to the
4965 linker or collect2. */
4968 get_file_function_name_long (const char *type
)
4974 if (first_global_object_name
)
4975 p
= first_global_object_name
;
4978 /* We don't have anything that we know to be unique to this translation
4979 unit, so use what we do have and throw in some randomness. */
4981 const char *name
= weak_global_object_name
;
4982 const char *file
= main_input_filename
;
4987 file
= input_filename
;
4989 len
= strlen (file
);
4990 q
= alloca (9 * 2 + len
+ 1);
4991 memcpy (q
, file
, len
+ 1);
4992 clean_symbol_name (q
);
4994 sprintf (q
+ len
, "_%08X_%08X", crc32_string (0, name
),
4995 crc32_string (0, flag_random_seed
));
5000 buf
= alloca (sizeof (FILE_FUNCTION_FORMAT
) + strlen (p
) + strlen (type
));
5002 /* Set up the name of the file-level functions we may need.
5003 Use a global object (which is already required to be unique over
5004 the program) rather than the file name (which imposes extra
5006 sprintf (buf
, FILE_FUNCTION_FORMAT
, type
, p
);
5008 return get_identifier (buf
);
5011 /* If KIND=='I', return a suitable global initializer (constructor) name.
5012 If KIND=='D', return a suitable global clean-up (destructor) name. */
5015 get_file_function_name (int kind
)
5022 return get_file_function_name_long (p
);
5025 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
5026 The result is placed in BUFFER (which has length BIT_SIZE),
5027 with one bit in each char ('\000' or '\001').
5029 If the constructor is constant, NULL_TREE is returned.
5030 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
5033 get_set_constructor_bits (tree init
, char *buffer
, int bit_size
)
5037 HOST_WIDE_INT domain_min
5038 = tree_low_cst (TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (init
))), 0);
5039 tree non_const_bits
= NULL_TREE
;
5041 for (i
= 0; i
< bit_size
; i
++)
5044 for (vals
= TREE_OPERAND (init
, 1);
5045 vals
!= NULL_TREE
; vals
= TREE_CHAIN (vals
))
5047 if (!host_integerp (TREE_VALUE (vals
), 0)
5048 || (TREE_PURPOSE (vals
) != NULL_TREE
5049 && !host_integerp (TREE_PURPOSE (vals
), 0)))
5051 = tree_cons (TREE_PURPOSE (vals
), TREE_VALUE (vals
), non_const_bits
);
5052 else if (TREE_PURPOSE (vals
) != NULL_TREE
)
5054 /* Set a range of bits to ones. */
5055 HOST_WIDE_INT lo_index
5056 = tree_low_cst (TREE_PURPOSE (vals
), 0) - domain_min
;
5057 HOST_WIDE_INT hi_index
5058 = tree_low_cst (TREE_VALUE (vals
), 0) - domain_min
;
5060 if (lo_index
< 0 || lo_index
>= bit_size
5061 || hi_index
< 0 || hi_index
>= bit_size
)
5063 for (; lo_index
<= hi_index
; lo_index
++)
5064 buffer
[lo_index
] = 1;
5068 /* Set a single bit to one. */
5070 = tree_low_cst (TREE_VALUE (vals
), 0) - domain_min
;
5071 if (index
< 0 || index
>= bit_size
)
5073 error ("invalid initializer for bit string");
5079 return non_const_bits
;
5082 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
5083 The result is placed in BUFFER (which is an array of bytes).
5084 If the constructor is constant, NULL_TREE is returned.
5085 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
5088 get_set_constructor_bytes (tree init
, unsigned char *buffer
, int wd_size
)
5091 int set_word_size
= BITS_PER_UNIT
;
5092 int bit_size
= wd_size
* set_word_size
;
5094 unsigned char *bytep
= buffer
;
5095 char *bit_buffer
= alloca (bit_size
);
5096 tree non_const_bits
= get_set_constructor_bits (init
, bit_buffer
, bit_size
);
5098 for (i
= 0; i
< wd_size
; i
++)
5101 for (i
= 0; i
< bit_size
; i
++)
5105 if (BYTES_BIG_ENDIAN
)
5106 *bytep
|= (1 << (set_word_size
- 1 - bit_pos
));
5108 *bytep
|= 1 << bit_pos
;
5111 if (bit_pos
>= set_word_size
)
5112 bit_pos
= 0, bytep
++;
5114 return non_const_bits
;
5117 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
5119 /* Complain that the tree code of NODE does not match the expected 0
5120 terminated list of trailing codes. FILE, LINE, and FUNCTION are of
5124 tree_check_failed (const tree node
, const char *file
,
5125 int line
, const char *function
, ...)
5129 unsigned length
= 0;
5132 va_start (args
, function
);
5133 while ((code
= va_arg (args
, int)))
5134 length
+= 4 + strlen (tree_code_name
[code
]);
5136 va_start (args
, function
);
5137 buffer
= alloca (length
);
5139 while ((code
= va_arg (args
, int)))
5143 strcpy (buffer
+ length
, " or ");
5146 strcpy (buffer
+ length
, tree_code_name
[code
]);
5147 length
+= strlen (tree_code_name
[code
]);
5151 internal_error ("tree check: expected %s, have %s in %s, at %s:%d",
5152 buffer
, tree_code_name
[TREE_CODE (node
)],
5153 function
, trim_filename (file
), line
);
5156 /* Complain that the tree code of NODE does match the expected 0
5157 terminated list of trailing codes. FILE, LINE, and FUNCTION are of
5161 tree_not_check_failed (const tree node
, const char *file
,
5162 int line
, const char *function
, ...)
5166 unsigned length
= 0;
5169 va_start (args
, function
);
5170 while ((code
= va_arg (args
, int)))
5171 length
+= 4 + strlen (tree_code_name
[code
]);
5173 va_start (args
, function
);
5174 buffer
= alloca (length
);
5176 while ((code
= va_arg (args
, int)))
5180 strcpy (buffer
+ length
, " or ");
5183 strcpy (buffer
+ length
, tree_code_name
[code
]);
5184 length
+= strlen (tree_code_name
[code
]);
5188 internal_error ("tree check: expected none of %s, have %s in %s, at %s:%d",
5189 buffer
, tree_code_name
[TREE_CODE (node
)],
5190 function
, trim_filename (file
), line
);
5193 /* Similar to tree_check_failed, except that we check for a class of tree
5194 code, given in CL. */
5197 tree_class_check_failed (const tree node
, int cl
, const char *file
,
5198 int line
, const char *function
)
5201 ("tree check: expected class '%c', have '%c' (%s) in %s, at %s:%d",
5202 cl
, TREE_CODE_CLASS (TREE_CODE (node
)),
5203 tree_code_name
[TREE_CODE (node
)], function
, trim_filename (file
), line
);
5206 /* Similar to above, except that the check is for the bounds of a TREE_VEC's
5207 (dynamically sized) vector. */
5210 tree_vec_elt_check_failed (int idx
, int len
, const char *file
, int line
,
5211 const char *function
)
5214 ("tree check: accessed elt %d of tree_vec with %d elts in %s, at %s:%d",
5215 idx
+ 1, len
, function
, trim_filename (file
), line
);
5218 /* Similar to above, except that the check is for the bounds of a PHI_NODE's
5219 (dynamically sized) vector. */
5222 phi_node_elt_check_failed (int idx
, int len
, const char *file
, int line
,
5223 const char *function
)
5226 ("tree check: accessed elt %d of phi_node with %d elts in %s, at %s:%d",
5227 idx
+ 1, len
, function
, trim_filename (file
), line
);
5230 /* Similar to above, except that the check is for the bounds of the operand
5231 vector of an expression node. */
5234 tree_operand_check_failed (int idx
, enum tree_code code
, const char *file
,
5235 int line
, const char *function
)
5238 ("tree check: accessed operand %d of %s with %d operands in %s, at %s:%d",
5239 idx
+ 1, tree_code_name
[code
], TREE_CODE_LENGTH (code
),
5240 function
, trim_filename (file
), line
);
5242 #endif /* ENABLE_TREE_CHECKING */
5244 /* Create a new vector type node holding SUBPARTS units of type INNERTYPE,
5245 and mapped to the machine mode MODE. Initialize its fields and build
5246 the information necessary for debugging output. */
5249 make_vector_type (tree innertype
, int nunits
, enum machine_mode mode
)
5251 tree t
= make_node (VECTOR_TYPE
);
5253 TREE_TYPE (t
) = innertype
;
5254 TYPE_VECTOR_SUBPARTS (t
) = nunits
;
5255 TYPE_MODE (t
) = mode
;
5259 tree index
= build_int_2 (nunits
- 1, 0);
5260 tree array
= build_array_type (innertype
, build_index_type (index
));
5261 tree rt
= make_node (RECORD_TYPE
);
5263 TYPE_FIELDS (rt
) = build_decl (FIELD_DECL
, get_identifier ("f"), array
);
5264 DECL_CONTEXT (TYPE_FIELDS (rt
)) = rt
;
5266 TYPE_DEBUG_REPRESENTATION_TYPE (t
) = rt
;
5267 /* In dwarfout.c, type lookup uses TYPE_UID numbers. We want to output
5268 the representation type, and we want to find that die when looking up
5269 the vector type. This is most easily achieved by making the TYPE_UID
5271 TYPE_UID (rt
) = TYPE_UID (t
);
5278 make_or_reuse_type (unsigned size
, int unsignedp
)
5280 if (size
== INT_TYPE_SIZE
)
5281 return unsignedp
? unsigned_type_node
: integer_type_node
;
5282 if (size
== CHAR_TYPE_SIZE
)
5283 return unsignedp
? unsigned_char_type_node
: signed_char_type_node
;
5284 if (size
== SHORT_TYPE_SIZE
)
5285 return unsignedp
? short_unsigned_type_node
: short_integer_type_node
;
5286 if (size
== LONG_TYPE_SIZE
)
5287 return unsignedp
? long_unsigned_type_node
: long_integer_type_node
;
5288 if (size
== LONG_LONG_TYPE_SIZE
)
5289 return (unsignedp
? long_long_unsigned_type_node
5290 : long_long_integer_type_node
);
5293 return make_unsigned_type (size
);
5295 return make_signed_type (size
);
5298 /* Create nodes for all integer types (and error_mark_node) using the sizes
5299 of C datatypes. The caller should call set_sizetype soon after calling
5300 this function to select one of the types as sizetype. */
5303 build_common_tree_nodes (int signed_char
)
5305 error_mark_node
= make_node (ERROR_MARK
);
5306 TREE_TYPE (error_mark_node
) = error_mark_node
;
5308 initialize_sizetypes ();
5310 /* Define both `signed char' and `unsigned char'. */
5311 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
5312 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
5314 /* Define `char', which is like either `signed char' or `unsigned char'
5315 but not the same as either. */
5318 ? make_signed_type (CHAR_TYPE_SIZE
)
5319 : make_unsigned_type (CHAR_TYPE_SIZE
));
5321 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
5322 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
5323 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
5324 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
5325 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
5326 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
5327 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
5328 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
5330 /* Define a boolean type. This type only represents boolean values but
5331 may be larger than char depending on the value of BOOL_TYPE_SIZE.
5332 Front ends which want to override this size (i.e. Java) can redefine
5333 boolean_type_node before calling build_common_tree_nodes_2. */
5334 boolean_type_node
= make_unsigned_type (BOOL_TYPE_SIZE
);
5335 TREE_SET_CODE (boolean_type_node
, BOOLEAN_TYPE
);
5336 TYPE_MAX_VALUE (boolean_type_node
) = build_int_2 (1, 0);
5337 TREE_TYPE (TYPE_MAX_VALUE (boolean_type_node
)) = boolean_type_node
;
5338 TYPE_PRECISION (boolean_type_node
) = 1;
5340 /* Fill in the rest of the sized types. Reuse existing type nodes
5342 intQI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (QImode
), 0);
5343 intHI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (HImode
), 0);
5344 intSI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (SImode
), 0);
5345 intDI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (DImode
), 0);
5346 intTI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (TImode
), 0);
5348 unsigned_intQI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (QImode
), 1);
5349 unsigned_intHI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (HImode
), 1);
5350 unsigned_intSI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (SImode
), 1);
5351 unsigned_intDI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (DImode
), 1);
5352 unsigned_intTI_type_node
= make_or_reuse_type (GET_MODE_BITSIZE (TImode
), 1);
5354 access_public_node
= get_identifier ("public");
5355 access_protected_node
= get_identifier ("protected");
5356 access_private_node
= get_identifier ("private");
5359 /* Call this function after calling build_common_tree_nodes and set_sizetype.
5360 It will create several other common tree nodes. */
5363 build_common_tree_nodes_2 (int short_double
)
5365 /* Define these next since types below may used them. */
5366 integer_zero_node
= build_int_2 (0, 0);
5367 integer_one_node
= build_int_2 (1, 0);
5368 integer_minus_one_node
= build_int_2 (-1, -1);
5370 size_zero_node
= size_int (0);
5371 size_one_node
= size_int (1);
5372 bitsize_zero_node
= bitsize_int (0);
5373 bitsize_one_node
= bitsize_int (1);
5374 bitsize_unit_node
= bitsize_int (BITS_PER_UNIT
);
5376 boolean_false_node
= TYPE_MIN_VALUE (boolean_type_node
);
5377 boolean_true_node
= TYPE_MAX_VALUE (boolean_type_node
);
5379 void_type_node
= make_node (VOID_TYPE
);
5380 layout_type (void_type_node
);
5382 /* We are not going to have real types in C with less than byte alignment,
5383 so we might as well not have any types that claim to have it. */
5384 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
5385 TYPE_USER_ALIGN (void_type_node
) = 0;
5387 null_pointer_node
= build_int_2 (0, 0);
5388 TREE_TYPE (null_pointer_node
) = build_pointer_type (void_type_node
);
5389 layout_type (TREE_TYPE (null_pointer_node
));
5391 ptr_type_node
= build_pointer_type (void_type_node
);
5393 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
5394 fileptr_type_node
= ptr_type_node
;
5396 float_type_node
= make_node (REAL_TYPE
);
5397 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
5398 layout_type (float_type_node
);
5400 double_type_node
= make_node (REAL_TYPE
);
5402 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
5404 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
5405 layout_type (double_type_node
);
5407 long_double_type_node
= make_node (REAL_TYPE
);
5408 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
5409 layout_type (long_double_type_node
);
5411 float_ptr_type_node
= build_pointer_type (float_type_node
);
5412 double_ptr_type_node
= build_pointer_type (double_type_node
);
5413 long_double_ptr_type_node
= build_pointer_type (long_double_type_node
);
5414 integer_ptr_type_node
= build_pointer_type (integer_type_node
);
5416 complex_integer_type_node
= make_node (COMPLEX_TYPE
);
5417 TREE_TYPE (complex_integer_type_node
) = integer_type_node
;
5418 layout_type (complex_integer_type_node
);
5420 complex_float_type_node
= make_node (COMPLEX_TYPE
);
5421 TREE_TYPE (complex_float_type_node
) = float_type_node
;
5422 layout_type (complex_float_type_node
);
5424 complex_double_type_node
= make_node (COMPLEX_TYPE
);
5425 TREE_TYPE (complex_double_type_node
) = double_type_node
;
5426 layout_type (complex_double_type_node
);
5428 complex_long_double_type_node
= make_node (COMPLEX_TYPE
);
5429 TREE_TYPE (complex_long_double_type_node
) = long_double_type_node
;
5430 layout_type (complex_long_double_type_node
);
5433 tree t
= targetm
.build_builtin_va_list ();
5435 /* Many back-ends define record types without setting TYPE_NAME.
5436 If we copied the record type here, we'd keep the original
5437 record type without a name. This breaks name mangling. So,
5438 don't copy record types and let c_common_nodes_and_builtins()
5439 declare the type to be __builtin_va_list. */
5440 if (TREE_CODE (t
) != RECORD_TYPE
)
5441 t
= build_type_copy (t
);
5443 va_list_type_node
= t
;
5447 /* HACK. GROSS. This is absolutely disgusting. I wish there was a
5450 If we requested a pointer to a vector, build up the pointers that
5451 we stripped off while looking for the inner type. Similarly for
5452 return values from functions.
5454 The argument TYPE is the top of the chain, and BOTTOM is the
5455 new type which we will point to. */
5458 reconstruct_complex_type (tree type
, tree bottom
)
5462 if (POINTER_TYPE_P (type
))
5464 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5465 outer
= build_pointer_type (inner
);
5467 else if (TREE_CODE (type
) == ARRAY_TYPE
)
5469 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5470 outer
= build_array_type (inner
, TYPE_DOMAIN (type
));
5472 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5474 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5475 outer
= build_function_type (inner
, TYPE_ARG_TYPES (type
));
5477 else if (TREE_CODE (type
) == METHOD_TYPE
)
5479 inner
= reconstruct_complex_type (TREE_TYPE (type
), bottom
);
5480 outer
= build_method_type_directly (TYPE_METHOD_BASETYPE (type
),
5482 TYPE_ARG_TYPES (type
));
5487 TYPE_READONLY (outer
) = TYPE_READONLY (type
);
5488 TYPE_VOLATILE (outer
) = TYPE_VOLATILE (type
);
5493 /* Returns a vector tree node given a mode (integer, vector, or BLKmode) and
5496 build_vector_type_for_mode (tree innertype
, enum machine_mode mode
)
5500 if (GET_MODE_CLASS (mode
) == MODE_VECTOR_INT
5501 || GET_MODE_CLASS (mode
) == MODE_VECTOR_FLOAT
)
5502 nunits
= GET_MODE_NUNITS (mode
);
5504 else if (GET_MODE_CLASS (mode
) == MODE_INT
)
5506 /* Check that there are no leftover bits. */
5507 if (GET_MODE_BITSIZE (mode
) % TREE_INT_CST_LOW (TYPE_SIZE (innertype
)))
5510 nunits
= GET_MODE_BITSIZE (mode
)
5511 / TREE_INT_CST_LOW (TYPE_SIZE (innertype
));
5516 return make_vector_type (innertype
, nunits
, mode
);
5519 /* Similarly, but takes the inner type and number of units, which must be
5523 build_vector_type (tree innertype
, int nunits
)
5525 return make_vector_type (innertype
, nunits
, VOIDmode
);
5528 /* Given an initializer INIT, return TRUE if INIT is zero or some
5529 aggregate of zeros. Otherwise return FALSE. */
5531 initializer_zerop (tree init
)
5537 switch (TREE_CODE (init
))
5540 return integer_zerop (init
);
5543 /* ??? Note that this is not correct for C4X float formats. There,
5544 a bit pattern of all zeros is 1.0; 0.0 is encoded with the most
5545 negative exponent. */
5546 return real_zerop (init
)
5547 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (init
));
5550 return integer_zerop (init
)
5551 || (real_zerop (init
)
5552 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_REALPART (init
)))
5553 && ! REAL_VALUE_MINUS_ZERO (TREE_REAL_CST (TREE_IMAGPART (init
))));
5556 for (elt
= TREE_VECTOR_CST_ELTS (init
); elt
; elt
= TREE_CHAIN (elt
))
5557 if (!initializer_zerop (TREE_VALUE (elt
)))
5562 elt
= CONSTRUCTOR_ELTS (init
);
5563 if (elt
== NULL_TREE
)
5566 /* A set is empty only if it has no elements. */
5567 if (TREE_CODE (TREE_TYPE (init
)) == SET_TYPE
)
5570 for (; elt
; elt
= TREE_CHAIN (elt
))
5571 if (! initializer_zerop (TREE_VALUE (elt
)))
5581 add_var_to_bind_expr (tree bind_expr
, tree var
)
5583 BIND_EXPR_VARS (bind_expr
)
5584 = chainon (BIND_EXPR_VARS (bind_expr
), var
);
5585 if (BIND_EXPR_BLOCK (bind_expr
))
5586 BLOCK_VARS (BIND_EXPR_BLOCK (bind_expr
))
5587 = BIND_EXPR_VARS (bind_expr
);
5590 /* Build an empty statement. */
5593 build_empty_stmt (void)
5595 return build1 (NOP_EXPR
, void_type_node
, size_zero_node
);
5599 /* Returns true if it is possible to prove that the index of
5600 an array access REF (an ARRAY_REF expression) falls into the
5604 in_array_bounds_p (tree ref
)
5606 tree idx
= TREE_OPERAND (ref
, 1);
5609 if (TREE_CODE (idx
) != INTEGER_CST
)
5612 min
= array_ref_low_bound (ref
);
5613 max
= array_ref_up_bound (ref
);
5616 || TREE_CODE (min
) != INTEGER_CST
5617 || TREE_CODE (max
) != INTEGER_CST
)
5620 if (tree_int_cst_lt (idx
, min
)
5621 || tree_int_cst_lt (max
, idx
))
5627 /* Return true if T (assumed to be a DECL) must be assigned a memory
5631 needs_to_live_in_memory (tree t
)
5633 return (DECL_NEEDS_TO_LIVE_IN_MEMORY_INTERNAL (t
)
5635 || DECL_EXTERNAL (t
)
5636 || (TREE_CODE (t
) == RESULT_DECL
5637 && aggregate_value_p (t
, current_function_decl
)));
5640 /* There are situations in which a language considers record types
5641 compatible which have different field lists. Decide if two fields
5642 are compatible. It is assumed that the parent records are compatible. */
5645 fields_compatible_p (tree f1
, tree f2
)
5647 if (!operand_equal_p (DECL_FIELD_BIT_OFFSET (f1
),
5648 DECL_FIELD_BIT_OFFSET (f2
), OEP_ONLY_CONST
))
5651 if (!operand_equal_p (DECL_FIELD_OFFSET (f1
),
5652 DECL_FIELD_OFFSET (f2
), OEP_ONLY_CONST
))
5655 if (!lang_hooks
.types_compatible_p (TREE_TYPE (f1
), TREE_TYPE (f2
)))
5661 /* Locate within RECORD a field that is compatible with ORIG_FIELD. */
5664 find_compatible_field (tree record
, tree orig_field
)
5668 for (f
= TYPE_FIELDS (record
); f
; f
= TREE_CHAIN (f
))
5669 if (TREE_CODE (f
) == FIELD_DECL
5670 && fields_compatible_p (f
, orig_field
))
5673 /* ??? Why isn't this on the main fields list? */
5674 f
= TYPE_VFIELD (record
);
5675 if (f
&& TREE_CODE (f
) == FIELD_DECL
5676 && fields_compatible_p (f
, orig_field
))
5679 /* ??? We should abort here, but Java appears to do Bad Things
5680 with inherited fields. */
5684 /* Return value of a constant X. */
5687 int_cst_value (tree x
)
5689 unsigned bits
= TYPE_PRECISION (TREE_TYPE (x
));
5690 unsigned HOST_WIDE_INT val
= TREE_INT_CST_LOW (x
);
5691 bool negative
= ((val
>> (bits
- 1)) & 1) != 0;
5693 if (bits
> HOST_BITS_PER_WIDE_INT
)
5697 val
|= (~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1) << 1;
5699 val
&= ~((~(unsigned HOST_WIDE_INT
) 0) << (bits
- 1) << 1);
5704 /* Returns the greatest common divisor of A and B, which must be
5708 tree_fold_gcd (tree a
, tree b
)
5711 tree type
= TREE_TYPE (a
);
5713 #if defined ENABLE_CHECKING
5714 if (TREE_CODE (a
) != INTEGER_CST
5715 || TREE_CODE (b
) != INTEGER_CST
)
5719 if (integer_zerop (a
))
5722 if (integer_zerop (b
))
5725 if (tree_int_cst_sgn (a
) == -1)
5726 a
= fold (build2 (MULT_EXPR
, type
, a
,
5727 convert (type
, integer_minus_one_node
)));
5729 if (tree_int_cst_sgn (b
) == -1)
5730 b
= fold (build2 (MULT_EXPR
, type
, b
,
5731 convert (type
, integer_minus_one_node
)));
5735 a_mod_b
= fold (build2 (CEIL_MOD_EXPR
, type
, a
, b
));
5737 if (!TREE_INT_CST_LOW (a_mod_b
)
5738 && !TREE_INT_CST_HIGH (a_mod_b
))
5746 #include "gt-tree.h"