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 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.
32 The low-level allocation routines oballoc and permalloc
33 are used also for allocating many other kinds of objects
34 by all passes of the compiler. */
48 #include "langhooks.h"
50 #define obstack_chunk_alloc xmalloc
51 #define obstack_chunk_free free
52 /* obstack.[ch] explicitly declined to prototype this. */
53 extern int _obstack_allocated_p
PARAMS ((struct obstack
*h
, PTR obj
));
55 static void unsave_expr_now_r
PARAMS ((tree
));
57 /* Objects allocated on this obstack last forever. */
59 struct obstack permanent_obstack
;
61 /* Table indexed by tree code giving a string containing a character
62 classifying the tree code. Possibilities are
63 t, d, s, c, r, <, 1, 2 and e. See tree.def for details. */
65 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
67 char tree_code_type
[MAX_TREE_CODES
] = {
72 /* Table indexed by tree code giving number of expression
73 operands beyond the fixed part of the node structure.
74 Not used for types or decls. */
76 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
78 int tree_code_length
[MAX_TREE_CODES
] = {
83 /* Names of tree components.
84 Used for printing out the tree and error messages. */
85 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
87 const char *tree_code_name
[MAX_TREE_CODES
] = {
92 /* Statistics-gathering stuff. */
112 int tree_node_counts
[(int) all_kinds
];
113 int tree_node_sizes
[(int) all_kinds
];
115 static const char * const tree_node_kind_names
[] = {
132 /* Unique id for next decl created. */
133 static int next_decl_uid
;
134 /* Unique id for next type created. */
135 static int next_type_uid
= 1;
137 /* Since we cannot rehash a type after it is in the table, we have to
138 keep the hash code. */
146 /* Initial size of the hash table (rounded to next prime). */
147 #define TYPE_HASH_INITIAL_SIZE 1000
149 /* Now here is the hash table. When recording a type, it is added to
150 the slot whose index is the hash code. Note that the hash table is
151 used for several kinds of types (function types, array types and
152 array index range types, for now). While all these live in the
153 same table, they are completely independent, and the hash code is
154 computed differently for each of these. */
156 htab_t type_hash_table
;
158 static void build_real_from_int_cst_1
PARAMS ((PTR
));
159 static void set_type_quals
PARAMS ((tree
, int));
160 static void append_random_chars
PARAMS ((char *));
161 static int type_hash_eq
PARAMS ((const void*, const void*));
162 static unsigned int type_hash_hash
PARAMS ((const void*));
163 static void print_type_hash_statistics
PARAMS((void));
164 static void finish_vector_type
PARAMS((tree
));
165 static tree make_vector
PARAMS ((enum machine_mode
, tree
, int));
166 static int type_hash_marked_p
PARAMS ((const void *));
167 static void type_hash_mark
PARAMS ((const void *));
168 static int mark_tree_hashtable_entry
PARAMS((void **, void *));
170 /* If non-null, these are language-specific helper functions for
171 unsave_expr_now. If present, LANG_UNSAVE is called before its
172 argument (an UNSAVE_EXPR) is to be unsaved, and all other
173 processing in unsave_expr_now is aborted. LANG_UNSAVE_EXPR_NOW is
174 called from unsave_expr_1 for language-specific tree codes. */
175 void (*lang_unsave
) PARAMS ((tree
*));
176 void (*lang_unsave_expr_now
) PARAMS ((tree
));
178 /* If non-null, these are language-specific helper functions for
179 unsafe_for_reeval. Return negative to not handle some tree. */
180 int (*lang_unsafe_for_reeval
) PARAMS ((tree
));
182 /* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of thing
183 that the assembler should talk about, set DECL_ASSEMBLER_NAME to an
184 appropriate IDENTIFIER_NODE. Otherwise, set it to the
185 ERROR_MARK_NODE to ensure that the assembler does not talk about
187 void (*lang_set_decl_assembler_name
) PARAMS ((tree
));
189 tree global_trees
[TI_MAX
];
190 tree integer_types
[itk_none
];
192 /* Set the DECL_ASSEMBLER_NAME for DECL. */
194 set_decl_assembler_name (decl
)
197 /* The language-independent code should never use the
198 DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and
199 VAR_DECLs for variables with static storage duration need a real
200 DECL_ASSEMBLER_NAME. */
201 if (TREE_CODE (decl
) == FUNCTION_DECL
202 || (TREE_CODE (decl
) == VAR_DECL
203 && (TREE_STATIC (decl
)
204 || DECL_EXTERNAL (decl
)
205 || TREE_PUBLIC (decl
))))
206 /* By default, assume the name to use in assembly code is the
207 same as that used in the source language. (That's correct
208 for C, and GCC used to set DECL_ASSEMBLER_NAME to the same
209 value as DECL_NAME in build_decl, so this choice provides
210 backwards compatibility with existing front-ends. */
211 SET_DECL_ASSEMBLER_NAME (decl
, DECL_NAME (decl
));
213 /* Nobody should ever be asking for the DECL_ASSEMBLER_NAME of
214 these DECLs -- unless they're in language-dependent code, in
215 which case lang_set_decl_assembler_name should handle things. */
219 /* Init the principal obstacks. */
224 gcc_obstack_init (&permanent_obstack
);
226 /* Initialize the hash table of types. */
227 type_hash_table
= htab_create (TYPE_HASH_INITIAL_SIZE
, type_hash_hash
,
229 ggc_add_deletable_htab (type_hash_table
, type_hash_marked_p
,
231 ggc_add_tree_root (global_trees
, TI_MAX
);
232 ggc_add_tree_root (integer_types
, itk_none
);
234 /* Set lang_set_decl_set_assembler_name to a default value. */
235 lang_set_decl_assembler_name
= set_decl_assembler_name
;
239 /* Allocate SIZE bytes in the permanent obstack
240 and return a pointer to them. */
246 return (char *) obstack_alloc (&permanent_obstack
, size
);
249 /* Allocate NELEM items of SIZE bytes in the permanent obstack
250 and return a pointer to them. The storage is cleared before
251 returning the value. */
254 perm_calloc (nelem
, size
)
258 char *rval
= (char *) obstack_alloc (&permanent_obstack
, nelem
* size
);
259 memset (rval
, 0, nelem
* size
);
263 /* Compute the number of bytes occupied by 'node'. This routine only
264 looks at TREE_CODE and, if the code is TREE_VEC, TREE_VEC_LENGTH. */
269 enum tree_code code
= TREE_CODE (node
);
271 switch (TREE_CODE_CLASS (code
))
273 case 'd': /* A decl node */
274 return sizeof (struct tree_decl
);
276 case 't': /* a type node */
277 return sizeof (struct tree_type
);
279 case 'b': /* a lexical block node */
280 return sizeof (struct tree_block
);
282 case 'r': /* a reference */
283 case 'e': /* an expression */
284 case 's': /* an expression with side effects */
285 case '<': /* a comparison expression */
286 case '1': /* a unary arithmetic expression */
287 case '2': /* a binary arithmetic expression */
288 return (sizeof (struct tree_exp
)
289 + (TREE_CODE_LENGTH (code
) - 1) * sizeof (char *));
291 case 'c': /* a constant */
292 /* We can't use TREE_CODE_LENGTH for INTEGER_CST, since the number of
293 words is machine-dependent due to varying length of HOST_WIDE_INT,
294 which might be wider than a pointer (e.g., long long). Similarly
295 for REAL_CST, since the number of words is machine-dependent due
296 to varying size and alignment of `double'. */
297 if (code
== INTEGER_CST
)
298 return sizeof (struct tree_int_cst
);
299 else if (code
== REAL_CST
)
300 return sizeof (struct tree_real_cst
);
302 return (sizeof (struct tree_common
)
303 + TREE_CODE_LENGTH (code
) * sizeof (char *));
305 case 'x': /* something random, like an identifier. */
308 length
= (sizeof (struct tree_common
)
309 + TREE_CODE_LENGTH (code
) * sizeof (char *));
310 if (code
== TREE_VEC
)
311 length
+= (TREE_VEC_LENGTH (node
) - 1) * sizeof (char *);
320 /* Return a newly allocated node of code CODE.
321 For decl and type nodes, some other fields are initialized.
322 The rest of the node is initialized to zero.
324 Achoo! I got a code in the node. */
331 int type
= TREE_CODE_CLASS (code
);
333 #ifdef GATHER_STATISTICS
336 struct tree_common ttmp
;
338 /* We can't allocate a TREE_VEC without knowing how many elements
340 if (code
== TREE_VEC
)
343 TREE_SET_CODE ((tree
)&ttmp
, code
);
344 length
= tree_size ((tree
)&ttmp
);
346 #ifdef GATHER_STATISTICS
349 case 'd': /* A decl node */
353 case 't': /* a type node */
357 case 'b': /* a lexical block */
361 case 's': /* an expression with side effects */
365 case 'r': /* a reference */
369 case 'e': /* an expression */
370 case '<': /* a comparison expression */
371 case '1': /* a unary arithmetic expression */
372 case '2': /* a binary arithmetic expression */
376 case 'c': /* a constant */
380 case 'x': /* something random, like an identifier. */
381 if (code
== IDENTIFIER_NODE
)
383 else if (code
== TREE_VEC
)
393 tree_node_counts
[(int) kind
]++;
394 tree_node_sizes
[(int) kind
] += length
;
397 t
= ggc_alloc_tree (length
);
399 memset ((PTR
) t
, 0, length
);
401 TREE_SET_CODE (t
, code
);
406 TREE_SIDE_EFFECTS (t
) = 1;
407 TREE_TYPE (t
) = void_type_node
;
411 if (code
!= FUNCTION_DECL
)
413 DECL_USER_ALIGN (t
) = 0;
414 DECL_IN_SYSTEM_HEADER (t
) = in_system_header
;
415 DECL_SOURCE_LINE (t
) = lineno
;
416 DECL_SOURCE_FILE (t
) =
417 (input_filename
) ? input_filename
: "<built-in>";
418 DECL_UID (t
) = next_decl_uid
++;
420 /* We have not yet computed the alias set for this declaration. */
421 DECL_POINTER_ALIAS_SET (t
) = -1;
425 TYPE_UID (t
) = next_type_uid
++;
426 TYPE_ALIGN (t
) = char_type_node
? TYPE_ALIGN (char_type_node
) : 0;
427 TYPE_USER_ALIGN (t
) = 0;
428 TYPE_MAIN_VARIANT (t
) = t
;
430 /* Default to no attributes for type, but let target change that. */
431 TYPE_ATTRIBUTES (t
) = NULL_TREE
;
432 (*targetm
.set_default_type_attributes
) (t
);
434 /* We have not yet computed the alias set for this type. */
435 TYPE_ALIAS_SET (t
) = -1;
439 TREE_CONSTANT (t
) = 1;
449 case PREDECREMENT_EXPR
:
450 case PREINCREMENT_EXPR
:
451 case POSTDECREMENT_EXPR
:
452 case POSTINCREMENT_EXPR
:
453 /* All of these have side-effects, no matter what their
455 TREE_SIDE_EFFECTS (t
) = 1;
467 /* A front-end can reset this to an appropriate function if types need
470 tree (*make_lang_type_fn
) PARAMS ((enum tree_code
)) = make_node
;
472 /* Return a new type (with the indicated CODE), doing whatever
473 language-specific processing is required. */
476 make_lang_type (code
)
479 return (*make_lang_type_fn
) (code
);
482 /* Return a new node with the same contents as NODE except that its
483 TREE_CHAIN is zero and it has a fresh uid. */
490 enum tree_code code
= TREE_CODE (node
);
493 length
= tree_size (node
);
494 t
= ggc_alloc_tree (length
);
495 memcpy (t
, node
, length
);
498 TREE_ASM_WRITTEN (t
) = 0;
500 if (TREE_CODE_CLASS (code
) == 'd')
501 DECL_UID (t
) = next_decl_uid
++;
502 else if (TREE_CODE_CLASS (code
) == 't')
504 TYPE_UID (t
) = next_type_uid
++;
505 /* The following is so that the debug code for
506 the copy is different from the original type.
507 The two statements usually duplicate each other
508 (because they clear fields of the same union),
509 but the optimizer should catch that. */
510 TYPE_SYMTAB_POINTER (t
) = 0;
511 TYPE_SYMTAB_ADDRESS (t
) = 0;
517 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
518 For example, this can copy a list made of TREE_LIST nodes. */
530 head
= prev
= copy_node (list
);
531 next
= TREE_CHAIN (list
);
534 TREE_CHAIN (prev
) = copy_node (next
);
535 prev
= TREE_CHAIN (prev
);
536 next
= TREE_CHAIN (next
);
542 /* Return a newly constructed INTEGER_CST node whose constant value
543 is specified by the two ints LOW and HI.
544 The TREE_TYPE is set to `int'.
546 This function should be used via the `build_int_2' macro. */
549 build_int_2_wide (low
, hi
)
550 unsigned HOST_WIDE_INT low
;
553 tree t
= make_node (INTEGER_CST
);
555 TREE_INT_CST_LOW (t
) = low
;
556 TREE_INT_CST_HIGH (t
) = hi
;
557 TREE_TYPE (t
) = integer_type_node
;
561 /* Return a new REAL_CST node whose type is TYPE and value is D. */
571 /* Check for valid float value for this type on this target machine;
572 if not, can print error message and store a valid value in D. */
573 #ifdef CHECK_FLOAT_VALUE
574 CHECK_FLOAT_VALUE (TYPE_MODE (type
), d
, overflow
);
577 v
= make_node (REAL_CST
);
578 TREE_TYPE (v
) = type
;
579 TREE_REAL_CST (v
) = d
;
580 TREE_OVERFLOW (v
) = TREE_CONSTANT_OVERFLOW (v
) = overflow
;
584 /* Return a new REAL_CST node whose type is TYPE
585 and whose value is the integer value of the INTEGER_CST node I. */
587 #if !defined (REAL_IS_NOT_DOUBLE) || defined (REAL_ARITHMETIC)
590 real_value_from_int_cst (type
, i
)
591 tree type ATTRIBUTE_UNUSED
, i
;
595 #ifdef REAL_ARITHMETIC
596 /* Clear all bits of the real value type so that we can later do
597 bitwise comparisons to see if two values are the same. */
598 memset ((char *) &d
, 0, sizeof d
);
600 if (! TREE_UNSIGNED (TREE_TYPE (i
)))
601 REAL_VALUE_FROM_INT (d
, TREE_INT_CST_LOW (i
), TREE_INT_CST_HIGH (i
),
604 REAL_VALUE_FROM_UNSIGNED_INT (d
, TREE_INT_CST_LOW (i
),
605 TREE_INT_CST_HIGH (i
), TYPE_MODE (type
));
606 #else /* not REAL_ARITHMETIC */
607 /* Some 386 compilers mishandle unsigned int to float conversions,
608 so introduce a temporary variable E to avoid those bugs. */
609 if (TREE_INT_CST_HIGH (i
) < 0 && ! TREE_UNSIGNED (TREE_TYPE (i
)))
613 d
= (double) (~TREE_INT_CST_HIGH (i
));
614 e
= ((double) ((HOST_WIDE_INT
) 1 << (HOST_BITS_PER_WIDE_INT
/ 2))
615 * (double) ((HOST_WIDE_INT
) 1 << (HOST_BITS_PER_WIDE_INT
/ 2)));
617 e
= (double) (~TREE_INT_CST_LOW (i
));
625 d
= (double) (unsigned HOST_WIDE_INT
) TREE_INT_CST_HIGH (i
);
626 e
= ((double) ((HOST_WIDE_INT
) 1 << (HOST_BITS_PER_WIDE_INT
/ 2))
627 * (double) ((HOST_WIDE_INT
) 1 << (HOST_BITS_PER_WIDE_INT
/ 2)));
629 e
= (double) TREE_INT_CST_LOW (i
);
632 #endif /* not REAL_ARITHMETIC */
636 /* Args to pass to and from build_real_from_int_cst_1. */
640 tree type
; /* Input: type to conver to. */
641 tree i
; /* Input: operand to convert. */
642 REAL_VALUE_TYPE d
; /* Output: floating point value. */
645 /* Convert an integer to a floating point value while protected by a floating
646 point exception handler. */
649 build_real_from_int_cst_1 (data
)
652 struct brfic_args
*args
= (struct brfic_args
*) data
;
654 #ifdef REAL_ARITHMETIC
655 args
->d
= real_value_from_int_cst (args
->type
, args
->i
);
658 = REAL_VALUE_TRUNCATE (TYPE_MODE (args
->type
),
659 real_value_from_int_cst (args
->type
, args
->i
));
663 /* Given a tree representing an integer constant I, return a tree
664 representing the same value as a floating-point constant of type TYPE.
665 We cannot perform this operation if there is no way of doing arithmetic
666 on floating-point values. */
669 build_real_from_int_cst (type
, i
)
674 int overflow
= TREE_OVERFLOW (i
);
676 struct brfic_args args
;
678 v
= make_node (REAL_CST
);
679 TREE_TYPE (v
) = type
;
681 /* Setup input for build_real_from_int_cst_1() */
685 if (do_float_handler (build_real_from_int_cst_1
, (PTR
) &args
))
686 /* Receive output from build_real_from_int_cst_1() */
690 /* We got an exception from build_real_from_int_cst_1() */
695 /* Check for valid float value for this type on this target machine. */
697 #ifdef CHECK_FLOAT_VALUE
698 CHECK_FLOAT_VALUE (TYPE_MODE (type
), d
, overflow
);
701 TREE_REAL_CST (v
) = d
;
702 TREE_OVERFLOW (v
) = TREE_CONSTANT_OVERFLOW (v
) = overflow
;
706 #endif /* not REAL_IS_NOT_DOUBLE, or REAL_ARITHMETIC */
708 /* Return a newly constructed STRING_CST node whose value is
709 the LEN characters at STR.
710 The TREE_TYPE is not initialized. */
713 build_string (len
, str
)
717 tree s
= make_node (STRING_CST
);
719 TREE_STRING_LENGTH (s
) = len
;
720 TREE_STRING_POINTER (s
) = ggc_alloc_string (str
, len
);
725 /* Return a newly constructed COMPLEX_CST node whose value is
726 specified by the real and imaginary parts REAL and IMAG.
727 Both REAL and IMAG should be constant nodes. TYPE, if specified,
728 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
731 build_complex (type
, real
, imag
)
735 tree t
= make_node (COMPLEX_CST
);
737 TREE_REALPART (t
) = real
;
738 TREE_IMAGPART (t
) = imag
;
739 TREE_TYPE (t
) = type
? type
: build_complex_type (TREE_TYPE (real
));
740 TREE_OVERFLOW (t
) = TREE_OVERFLOW (real
) | TREE_OVERFLOW (imag
);
741 TREE_CONSTANT_OVERFLOW (t
)
742 = TREE_CONSTANT_OVERFLOW (real
) | TREE_CONSTANT_OVERFLOW (imag
);
746 /* Build a newly constructed TREE_VEC node of length LEN. */
753 int length
= (len
-1) * sizeof (tree
) + sizeof (struct tree_vec
);
755 #ifdef GATHER_STATISTICS
756 tree_node_counts
[(int)vec_kind
]++;
757 tree_node_sizes
[(int)vec_kind
] += length
;
760 t
= ggc_alloc_tree (length
);
762 memset ((PTR
) t
, 0, length
);
763 TREE_SET_CODE (t
, TREE_VEC
);
764 TREE_VEC_LENGTH (t
) = len
;
769 /* Return 1 if EXPR is the integer constant zero or a complex constant
778 return ((TREE_CODE (expr
) == INTEGER_CST
779 && ! TREE_CONSTANT_OVERFLOW (expr
)
780 && TREE_INT_CST_LOW (expr
) == 0
781 && TREE_INT_CST_HIGH (expr
) == 0)
782 || (TREE_CODE (expr
) == COMPLEX_CST
783 && integer_zerop (TREE_REALPART (expr
))
784 && integer_zerop (TREE_IMAGPART (expr
))));
787 /* Return 1 if EXPR is the integer constant one or the corresponding
796 return ((TREE_CODE (expr
) == INTEGER_CST
797 && ! TREE_CONSTANT_OVERFLOW (expr
)
798 && TREE_INT_CST_LOW (expr
) == 1
799 && TREE_INT_CST_HIGH (expr
) == 0)
800 || (TREE_CODE (expr
) == COMPLEX_CST
801 && integer_onep (TREE_REALPART (expr
))
802 && integer_zerop (TREE_IMAGPART (expr
))));
805 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
806 it contains. Likewise for the corresponding complex constant. */
809 integer_all_onesp (expr
)
817 if (TREE_CODE (expr
) == COMPLEX_CST
818 && integer_all_onesp (TREE_REALPART (expr
))
819 && integer_zerop (TREE_IMAGPART (expr
)))
822 else if (TREE_CODE (expr
) != INTEGER_CST
823 || TREE_CONSTANT_OVERFLOW (expr
))
826 uns
= TREE_UNSIGNED (TREE_TYPE (expr
));
828 return (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
829 && TREE_INT_CST_HIGH (expr
) == -1);
831 /* Note that using TYPE_PRECISION here is wrong. We care about the
832 actual bits, not the (arbitrary) range of the type. */
833 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr
)));
834 if (prec
>= HOST_BITS_PER_WIDE_INT
)
836 HOST_WIDE_INT high_value
;
839 shift_amount
= prec
- HOST_BITS_PER_WIDE_INT
;
841 if (shift_amount
> HOST_BITS_PER_WIDE_INT
)
842 /* Can not handle precisions greater than twice the host int size. */
844 else if (shift_amount
== HOST_BITS_PER_WIDE_INT
)
845 /* Shifting by the host word size is undefined according to the ANSI
846 standard, so we must handle this as a special case. */
849 high_value
= ((HOST_WIDE_INT
) 1 << shift_amount
) - 1;
851 return (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
852 && TREE_INT_CST_HIGH (expr
) == high_value
);
855 return TREE_INT_CST_LOW (expr
) == ((unsigned HOST_WIDE_INT
) 1 << prec
) - 1;
858 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
866 HOST_WIDE_INT high
, low
;
870 if (TREE_CODE (expr
) == COMPLEX_CST
871 && integer_pow2p (TREE_REALPART (expr
))
872 && integer_zerop (TREE_IMAGPART (expr
)))
875 if (TREE_CODE (expr
) != INTEGER_CST
|| TREE_CONSTANT_OVERFLOW (expr
))
878 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
879 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
880 high
= TREE_INT_CST_HIGH (expr
);
881 low
= TREE_INT_CST_LOW (expr
);
883 /* First clear all bits that are beyond the type's precision in case
884 we've been sign extended. */
886 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
888 else if (prec
> HOST_BITS_PER_WIDE_INT
)
889 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
893 if (prec
< HOST_BITS_PER_WIDE_INT
)
894 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
897 if (high
== 0 && low
== 0)
900 return ((high
== 0 && (low
& (low
- 1)) == 0)
901 || (low
== 0 && (high
& (high
- 1)) == 0));
904 /* Return the power of two represented by a tree node known to be a
912 HOST_WIDE_INT high
, low
;
916 if (TREE_CODE (expr
) == COMPLEX_CST
)
917 return tree_log2 (TREE_REALPART (expr
));
919 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
920 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
922 high
= TREE_INT_CST_HIGH (expr
);
923 low
= TREE_INT_CST_LOW (expr
);
925 /* First clear all bits that are beyond the type's precision in case
926 we've been sign extended. */
928 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
930 else if (prec
> HOST_BITS_PER_WIDE_INT
)
931 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
935 if (prec
< HOST_BITS_PER_WIDE_INT
)
936 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
939 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ exact_log2 (high
)
943 /* Similar, but return the largest integer Y such that 2 ** Y is less
944 than or equal to EXPR. */
947 tree_floor_log2 (expr
)
951 HOST_WIDE_INT high
, low
;
955 if (TREE_CODE (expr
) == COMPLEX_CST
)
956 return tree_log2 (TREE_REALPART (expr
));
958 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
959 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
961 high
= TREE_INT_CST_HIGH (expr
);
962 low
= TREE_INT_CST_LOW (expr
);
964 /* First clear all bits that are beyond the type's precision in case
965 we've been sign extended. Ignore if type's precision hasn't been set
966 since what we are doing is setting it. */
968 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
|| prec
== 0)
970 else if (prec
> HOST_BITS_PER_WIDE_INT
)
971 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
975 if (prec
< HOST_BITS_PER_WIDE_INT
)
976 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
979 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ floor_log2 (high
)
983 /* Return 1 if EXPR is the real constant zero. */
991 return ((TREE_CODE (expr
) == REAL_CST
992 && ! TREE_CONSTANT_OVERFLOW (expr
)
993 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst0
))
994 || (TREE_CODE (expr
) == COMPLEX_CST
995 && real_zerop (TREE_REALPART (expr
))
996 && real_zerop (TREE_IMAGPART (expr
))));
999 /* Return 1 if EXPR is the real constant one in real or complex form. */
1007 return ((TREE_CODE (expr
) == REAL_CST
1008 && ! TREE_CONSTANT_OVERFLOW (expr
)
1009 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst1
))
1010 || (TREE_CODE (expr
) == COMPLEX_CST
1011 && real_onep (TREE_REALPART (expr
))
1012 && real_zerop (TREE_IMAGPART (expr
))));
1015 /* Return 1 if EXPR is the real constant two. */
1023 return ((TREE_CODE (expr
) == REAL_CST
1024 && ! TREE_CONSTANT_OVERFLOW (expr
)
1025 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst2
))
1026 || (TREE_CODE (expr
) == COMPLEX_CST
1027 && real_twop (TREE_REALPART (expr
))
1028 && real_zerop (TREE_IMAGPART (expr
))));
1031 /* Nonzero if EXP is a constant or a cast of a constant. */
1034 really_constant_p (exp
)
1037 /* This is not quite the same as STRIP_NOPS. It does more. */
1038 while (TREE_CODE (exp
) == NOP_EXPR
1039 || TREE_CODE (exp
) == CONVERT_EXPR
1040 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
1041 exp
= TREE_OPERAND (exp
, 0);
1042 return TREE_CONSTANT (exp
);
1045 /* Return first list element whose TREE_VALUE is ELEM.
1046 Return 0 if ELEM is not in LIST. */
1049 value_member (elem
, list
)
1054 if (elem
== TREE_VALUE (list
))
1056 list
= TREE_CHAIN (list
);
1061 /* Return first list element whose TREE_PURPOSE is ELEM.
1062 Return 0 if ELEM is not in LIST. */
1065 purpose_member (elem
, list
)
1070 if (elem
== TREE_PURPOSE (list
))
1072 list
= TREE_CHAIN (list
);
1077 /* Return first list element whose BINFO_TYPE is ELEM.
1078 Return 0 if ELEM is not in LIST. */
1081 binfo_member (elem
, list
)
1086 if (elem
== BINFO_TYPE (list
))
1088 list
= TREE_CHAIN (list
);
1093 /* Return nonzero if ELEM is part of the chain CHAIN. */
1096 chain_member (elem
, chain
)
1103 chain
= TREE_CHAIN (chain
);
1109 /* Return nonzero if ELEM is equal to TREE_VALUE (CHAIN) for any piece of
1110 chain CHAIN. This and the next function are currently unused, but
1111 are retained for completeness. */
1114 chain_member_value (elem
, chain
)
1119 if (elem
== TREE_VALUE (chain
))
1121 chain
= TREE_CHAIN (chain
);
1127 /* Return nonzero if ELEM is equal to TREE_PURPOSE (CHAIN)
1128 for any piece of chain CHAIN. */
1131 chain_member_purpose (elem
, chain
)
1136 if (elem
== TREE_PURPOSE (chain
))
1138 chain
= TREE_CHAIN (chain
);
1144 /* Return the length of a chain of nodes chained through TREE_CHAIN.
1145 We expect a null pointer to mark the end of the chain.
1146 This is the Lisp primitive `length'. */
1155 for (tail
= t
; tail
; tail
= TREE_CHAIN (tail
))
1161 /* Returns the number of FIELD_DECLs in TYPE. */
1164 fields_length (type
)
1167 tree t
= TYPE_FIELDS (type
);
1170 for (; t
; t
= TREE_CHAIN (t
))
1171 if (TREE_CODE (t
) == FIELD_DECL
)
1177 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
1178 by modifying the last node in chain 1 to point to chain 2.
1179 This is the Lisp primitive `nconc'. */
1189 #ifdef ENABLE_TREE_CHECKING
1193 for (t1
= op1
; TREE_CHAIN (t1
); t1
= TREE_CHAIN (t1
))
1195 TREE_CHAIN (t1
) = op2
;
1196 #ifdef ENABLE_TREE_CHECKING
1197 for (t2
= op2
; t2
; t2
= TREE_CHAIN (t2
))
1199 abort (); /* Circularity created. */
1207 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
1215 while ((next
= TREE_CHAIN (chain
)))
1220 /* Reverse the order of elements in the chain T,
1221 and return the new head of the chain (old last element). */
1227 tree prev
= 0, decl
, next
;
1228 for (decl
= t
; decl
; decl
= next
)
1230 next
= TREE_CHAIN (decl
);
1231 TREE_CHAIN (decl
) = prev
;
1237 /* Given a chain CHAIN of tree nodes,
1238 construct and return a list of those nodes. */
1244 tree result
= NULL_TREE
;
1245 tree in_tail
= chain
;
1246 tree out_tail
= NULL_TREE
;
1250 tree next
= tree_cons (NULL_TREE
, in_tail
, NULL_TREE
);
1252 TREE_CHAIN (out_tail
) = next
;
1256 in_tail
= TREE_CHAIN (in_tail
);
1262 /* Return a newly created TREE_LIST node whose
1263 purpose and value fields are PARM and VALUE. */
1266 build_tree_list (parm
, value
)
1269 tree t
= make_node (TREE_LIST
);
1270 TREE_PURPOSE (t
) = parm
;
1271 TREE_VALUE (t
) = value
;
1275 /* Return a newly created TREE_LIST node whose
1276 purpose and value fields are PARM and VALUE
1277 and whose TREE_CHAIN is CHAIN. */
1280 tree_cons (purpose
, value
, chain
)
1281 tree purpose
, value
, chain
;
1285 node
= ggc_alloc_tree (sizeof (struct tree_list
));
1287 memset (node
, 0, sizeof (struct tree_common
));
1289 #ifdef GATHER_STATISTICS
1290 tree_node_counts
[(int) x_kind
]++;
1291 tree_node_sizes
[(int) x_kind
] += sizeof (struct tree_list
);
1294 TREE_SET_CODE (node
, TREE_LIST
);
1295 TREE_CHAIN (node
) = chain
;
1296 TREE_PURPOSE (node
) = purpose
;
1297 TREE_VALUE (node
) = value
;
1302 /* Return the size nominally occupied by an object of type TYPE
1303 when it resides in memory. The value is measured in units of bytes,
1304 and its data type is that normally used for type sizes
1305 (which is the first type created by make_signed_type or
1306 make_unsigned_type). */
1309 size_in_bytes (type
)
1314 if (type
== error_mark_node
)
1315 return integer_zero_node
;
1317 type
= TYPE_MAIN_VARIANT (type
);
1318 t
= TYPE_SIZE_UNIT (type
);
1322 incomplete_type_error (NULL_TREE
, type
);
1323 return size_zero_node
;
1326 if (TREE_CODE (t
) == INTEGER_CST
)
1327 force_fit_type (t
, 0);
1332 /* Return the size of TYPE (in bytes) as a wide integer
1333 or return -1 if the size can vary or is larger than an integer. */
1336 int_size_in_bytes (type
)
1341 if (type
== error_mark_node
)
1344 type
= TYPE_MAIN_VARIANT (type
);
1345 t
= TYPE_SIZE_UNIT (type
);
1347 || TREE_CODE (t
) != INTEGER_CST
1348 || TREE_OVERFLOW (t
)
1349 || TREE_INT_CST_HIGH (t
) != 0
1350 /* If the result would appear negative, it's too big to represent. */
1351 || (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0)
1354 return TREE_INT_CST_LOW (t
);
1357 /* Return the bit position of FIELD, in bits from the start of the record.
1358 This is a tree of type bitsizetype. */
1361 bit_position (field
)
1365 return bit_from_pos (DECL_FIELD_OFFSET (field
),
1366 DECL_FIELD_BIT_OFFSET (field
));
1369 /* Likewise, but return as an integer. Abort if it cannot be represented
1370 in that way (since it could be a signed value, we don't have the option
1371 of returning -1 like int_size_in_byte can. */
1374 int_bit_position (field
)
1377 return tree_low_cst (bit_position (field
), 0);
1380 /* Return the byte position of FIELD, in bytes from the start of the record.
1381 This is a tree of type sizetype. */
1384 byte_position (field
)
1387 return byte_from_pos (DECL_FIELD_OFFSET (field
),
1388 DECL_FIELD_BIT_OFFSET (field
));
1391 /* Likewise, but return as an integer. Abort if it cannot be represented
1392 in that way (since it could be a signed value, we don't have the option
1393 of returning -1 like int_size_in_byte can. */
1396 int_byte_position (field
)
1399 return tree_low_cst (byte_position (field
), 0);
1402 /* Return the strictest alignment, in bits, that T is known to have. */
1408 unsigned int align0
, align1
;
1410 switch (TREE_CODE (t
))
1412 case NOP_EXPR
: case CONVERT_EXPR
: case NON_LVALUE_EXPR
:
1413 /* If we have conversions, we know that the alignment of the
1414 object must meet each of the alignments of the types. */
1415 align0
= expr_align (TREE_OPERAND (t
, 0));
1416 align1
= TYPE_ALIGN (TREE_TYPE (t
));
1417 return MAX (align0
, align1
);
1419 case SAVE_EXPR
: case COMPOUND_EXPR
: case MODIFY_EXPR
:
1420 case INIT_EXPR
: case TARGET_EXPR
: case WITH_CLEANUP_EXPR
:
1421 case WITH_RECORD_EXPR
: case CLEANUP_POINT_EXPR
: case UNSAVE_EXPR
:
1422 /* These don't change the alignment of an object. */
1423 return expr_align (TREE_OPERAND (t
, 0));
1426 /* The best we can do is say that the alignment is the least aligned
1428 align0
= expr_align (TREE_OPERAND (t
, 1));
1429 align1
= expr_align (TREE_OPERAND (t
, 2));
1430 return MIN (align0
, align1
);
1432 case LABEL_DECL
: case CONST_DECL
:
1433 case VAR_DECL
: case PARM_DECL
: case RESULT_DECL
:
1434 if (DECL_ALIGN (t
) != 0)
1435 return DECL_ALIGN (t
);
1439 return FUNCTION_BOUNDARY
;
1445 /* Otherwise take the alignment from that of the type. */
1446 return TYPE_ALIGN (TREE_TYPE (t
));
1449 /* Return, as a tree node, the number of elements for TYPE (which is an
1450 ARRAY_TYPE) minus one. This counts only elements of the top array. */
1453 array_type_nelts (type
)
1456 tree index_type
, min
, max
;
1458 /* If they did it with unspecified bounds, then we should have already
1459 given an error about it before we got here. */
1460 if (! TYPE_DOMAIN (type
))
1461 return error_mark_node
;
1463 index_type
= TYPE_DOMAIN (type
);
1464 min
= TYPE_MIN_VALUE (index_type
);
1465 max
= TYPE_MAX_VALUE (index_type
);
1467 return (integer_zerop (min
)
1469 : fold (build (MINUS_EXPR
, TREE_TYPE (max
), max
, min
)));
1472 /* Return nonzero if arg is static -- a reference to an object in
1473 static storage. This is not the same as the C meaning of `static'. */
1479 switch (TREE_CODE (arg
))
1482 /* Nested functions aren't static, since taking their address
1483 involves a trampoline. */
1484 return (decl_function_context (arg
) == 0 || DECL_NO_STATIC_CHAIN (arg
))
1485 && ! DECL_NON_ADDR_CONST_P (arg
);
1488 return (TREE_STATIC (arg
) || DECL_EXTERNAL (arg
))
1489 && ! DECL_NON_ADDR_CONST_P (arg
);
1492 return TREE_STATIC (arg
);
1498 /* If we are referencing a bitfield, we can't evaluate an
1499 ADDR_EXPR at compile time and so it isn't a constant. */
1501 return (! DECL_BIT_FIELD (TREE_OPERAND (arg
, 1))
1502 && staticp (TREE_OPERAND (arg
, 0)));
1508 /* This case is technically correct, but results in setting
1509 TREE_CONSTANT on ADDR_EXPRs that cannot be evaluated at
1512 return TREE_CONSTANT (TREE_OPERAND (arg
, 0));
1516 case ARRAY_RANGE_REF
:
1517 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg
))) == INTEGER_CST
1518 && TREE_CODE (TREE_OPERAND (arg
, 1)) == INTEGER_CST
)
1519 return staticp (TREE_OPERAND (arg
, 0));
1522 if ((unsigned int) TREE_CODE (arg
)
1523 >= (unsigned int) LAST_AND_UNUSED_TREE_CODE
)
1524 return (*lang_hooks
.staticp
) (arg
);
1530 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
1531 Do this to any expression which may be used in more than one place,
1532 but must be evaluated only once.
1534 Normally, expand_expr would reevaluate the expression each time.
1535 Calling save_expr produces something that is evaluated and recorded
1536 the first time expand_expr is called on it. Subsequent calls to
1537 expand_expr just reuse the recorded value.
1539 The call to expand_expr that generates code that actually computes
1540 the value is the first call *at compile time*. Subsequent calls
1541 *at compile time* generate code to use the saved value.
1542 This produces correct result provided that *at run time* control
1543 always flows through the insns made by the first expand_expr
1544 before reaching the other places where the save_expr was evaluated.
1545 You, the caller of save_expr, must make sure this is so.
1547 Constants, and certain read-only nodes, are returned with no
1548 SAVE_EXPR because that is safe. Expressions containing placeholders
1549 are not touched; see tree.def for an explanation of what these
1556 tree t
= fold (expr
);
1559 /* We don't care about whether this can be used as an lvalue in this
1561 while (TREE_CODE (t
) == NON_LVALUE_EXPR
)
1562 t
= TREE_OPERAND (t
, 0);
1564 /* If we have simple operations applied to a SAVE_EXPR or to a SAVE_EXPR and
1565 a constant, it will be more efficient to not make another SAVE_EXPR since
1566 it will allow better simplification and GCSE will be able to merge the
1567 computations if they actualy occur. */
1569 (TREE_CODE_CLASS (TREE_CODE (inner
)) == '1'
1570 || (TREE_CODE_CLASS (TREE_CODE (inner
)) == '2'
1571 && TREE_CONSTANT (TREE_OPERAND (inner
, 1))));
1572 inner
= TREE_OPERAND (inner
, 0))
1575 /* If the tree evaluates to a constant, then we don't want to hide that
1576 fact (i.e. this allows further folding, and direct checks for constants).
1577 However, a read-only object that has side effects cannot be bypassed.
1578 Since it is no problem to reevaluate literals, we just return the
1580 if (TREE_CONSTANT (inner
)
1581 || (TREE_READONLY (inner
) && ! TREE_SIDE_EFFECTS (inner
))
1582 || TREE_CODE (inner
) == SAVE_EXPR
|| TREE_CODE (inner
) == ERROR_MARK
)
1585 /* If T contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
1586 it means that the size or offset of some field of an object depends on
1587 the value within another field.
1589 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
1590 and some variable since it would then need to be both evaluated once and
1591 evaluated more than once. Front-ends must assure this case cannot
1592 happen by surrounding any such subexpressions in their own SAVE_EXPR
1593 and forcing evaluation at the proper time. */
1594 if (contains_placeholder_p (t
))
1597 t
= build (SAVE_EXPR
, TREE_TYPE (expr
), t
, current_function_decl
, NULL_TREE
);
1599 /* This expression might be placed ahead of a jump to ensure that the
1600 value was computed on both sides of the jump. So make sure it isn't
1601 eliminated as dead. */
1602 TREE_SIDE_EFFECTS (t
) = 1;
1603 TREE_READONLY (t
) = 1;
1607 /* Arrange for an expression to be expanded multiple independent
1608 times. This is useful for cleanup actions, as the backend can
1609 expand them multiple times in different places. */
1617 /* If this is already protected, no sense in protecting it again. */
1618 if (TREE_CODE (expr
) == UNSAVE_EXPR
)
1621 t
= build1 (UNSAVE_EXPR
, TREE_TYPE (expr
), expr
);
1622 TREE_SIDE_EFFECTS (t
) = TREE_SIDE_EFFECTS (expr
);
1626 /* Returns the index of the first non-tree operand for CODE, or the number
1627 of operands if all are trees. */
1631 enum tree_code code
;
1637 case GOTO_SUBROUTINE_EXPR
:
1640 case WITH_CLEANUP_EXPR
:
1642 case METHOD_CALL_EXPR
:
1645 return TREE_CODE_LENGTH (code
);
1649 /* Perform any modifications to EXPR required when it is unsaved. Does
1650 not recurse into EXPR's subtrees. */
1653 unsave_expr_1 (expr
)
1656 switch (TREE_CODE (expr
))
1659 if (! SAVE_EXPR_PERSISTENT_P (expr
))
1660 SAVE_EXPR_RTL (expr
) = 0;
1664 /* Don't mess with a TARGET_EXPR that hasn't been expanded.
1665 It's OK for this to happen if it was part of a subtree that
1666 isn't immediately expanded, such as operand 2 of another
1668 if (TREE_OPERAND (expr
, 1))
1671 TREE_OPERAND (expr
, 1) = TREE_OPERAND (expr
, 3);
1672 TREE_OPERAND (expr
, 3) = NULL_TREE
;
1676 /* I don't yet know how to emit a sequence multiple times. */
1677 if (RTL_EXPR_SEQUENCE (expr
) != 0)
1682 if (lang_unsave_expr_now
!= 0)
1683 (*lang_unsave_expr_now
) (expr
);
1688 /* Helper function for unsave_expr_now. */
1691 unsave_expr_now_r (expr
)
1694 enum tree_code code
;
1696 /* There's nothing to do for NULL_TREE. */
1700 unsave_expr_1 (expr
);
1702 code
= TREE_CODE (expr
);
1703 switch (TREE_CODE_CLASS (code
))
1705 case 'c': /* a constant */
1706 case 't': /* a type node */
1707 case 'd': /* A decl node */
1708 case 'b': /* A block node */
1711 case 'x': /* miscellaneous: e.g., identifier, TREE_LIST or ERROR_MARK. */
1712 if (code
== TREE_LIST
)
1714 unsave_expr_now_r (TREE_VALUE (expr
));
1715 unsave_expr_now_r (TREE_CHAIN (expr
));
1719 case 'e': /* an expression */
1720 case 'r': /* a reference */
1721 case 's': /* an expression with side effects */
1722 case '<': /* a comparison expression */
1723 case '2': /* a binary arithmetic expression */
1724 case '1': /* a unary arithmetic expression */
1728 for (i
= first_rtl_op (code
) - 1; i
>= 0; i
--)
1729 unsave_expr_now_r (TREE_OPERAND (expr
, i
));
1738 /* Modify a tree in place so that all the evaluate only once things
1739 are cleared out. Return the EXPR given. */
1742 unsave_expr_now (expr
)
1745 if (lang_unsave
!= 0)
1746 (*lang_unsave
) (&expr
);
1748 unsave_expr_now_r (expr
);
1753 /* Return 0 if it is safe to evaluate EXPR multiple times,
1754 return 1 if it is safe if EXPR is unsaved afterward, or
1755 return 2 if it is completely unsafe.
1757 This assumes that CALL_EXPRs and TARGET_EXPRs are never replicated in
1758 an expression tree, so that it safe to unsave them and the surrounding
1759 context will be correct.
1761 SAVE_EXPRs basically *only* appear replicated in an expression tree,
1762 occasionally across the whole of a function. It is therefore only
1763 safe to unsave a SAVE_EXPR if you know that all occurrences appear
1764 below the UNSAVE_EXPR.
1766 RTL_EXPRs consume their rtl during evaluation. It is therefore
1767 never possible to unsave them. */
1770 unsafe_for_reeval (expr
)
1774 enum tree_code code
;
1779 if (expr
== NULL_TREE
)
1782 code
= TREE_CODE (expr
);
1783 first_rtl
= first_rtl_op (code
);
1792 for (exp
= expr
; exp
!= 0; exp
= TREE_CHAIN (exp
))
1794 tmp
= unsafe_for_reeval (TREE_VALUE (exp
));
1795 unsafeness
= MAX (tmp
, unsafeness
);
1801 tmp
= unsafe_for_reeval (TREE_OPERAND (expr
, 1));
1802 return MAX (tmp
, 1);
1809 if (lang_unsafe_for_reeval
!= 0)
1811 tmp
= (*lang_unsafe_for_reeval
) (expr
);
1818 switch (TREE_CODE_CLASS (code
))
1820 case 'c': /* a constant */
1821 case 't': /* a type node */
1822 case 'x': /* something random, like an identifier or an ERROR_MARK. */
1823 case 'd': /* A decl node */
1824 case 'b': /* A block node */
1827 case 'e': /* an expression */
1828 case 'r': /* a reference */
1829 case 's': /* an expression with side effects */
1830 case '<': /* a comparison expression */
1831 case '2': /* a binary arithmetic expression */
1832 case '1': /* a unary arithmetic expression */
1833 for (i
= first_rtl
- 1; i
>= 0; i
--)
1835 tmp
= unsafe_for_reeval (TREE_OPERAND (expr
, i
));
1836 unsafeness
= MAX (tmp
, unsafeness
);
1846 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
1847 or offset that depends on a field within a record. */
1850 contains_placeholder_p (exp
)
1853 enum tree_code code
;
1859 /* If we have a WITH_RECORD_EXPR, it "cancels" any PLACEHOLDER_EXPR
1860 in it since it is supplying a value for it. */
1861 code
= TREE_CODE (exp
);
1862 if (code
== WITH_RECORD_EXPR
)
1864 else if (code
== PLACEHOLDER_EXPR
)
1867 switch (TREE_CODE_CLASS (code
))
1870 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
1871 position computations since they will be converted into a
1872 WITH_RECORD_EXPR involving the reference, which will assume
1873 here will be valid. */
1874 return contains_placeholder_p (TREE_OPERAND (exp
, 0));
1877 if (code
== TREE_LIST
)
1878 return (contains_placeholder_p (TREE_VALUE (exp
))
1879 || (TREE_CHAIN (exp
) != 0
1880 && contains_placeholder_p (TREE_CHAIN (exp
))));
1889 /* Ignoring the first operand isn't quite right, but works best. */
1890 return contains_placeholder_p (TREE_OPERAND (exp
, 1));
1897 return (contains_placeholder_p (TREE_OPERAND (exp
, 0))
1898 || contains_placeholder_p (TREE_OPERAND (exp
, 1))
1899 || contains_placeholder_p (TREE_OPERAND (exp
, 2)));
1902 /* If we already know this doesn't have a placeholder, don't
1904 if (SAVE_EXPR_NOPLACEHOLDER (exp
) || SAVE_EXPR_RTL (exp
) != 0)
1907 SAVE_EXPR_NOPLACEHOLDER (exp
) = 1;
1908 result
= contains_placeholder_p (TREE_OPERAND (exp
, 0));
1910 SAVE_EXPR_NOPLACEHOLDER (exp
) = 0;
1915 return (TREE_OPERAND (exp
, 1) != 0
1916 && contains_placeholder_p (TREE_OPERAND (exp
, 1)));
1922 switch (TREE_CODE_LENGTH (code
))
1925 return contains_placeholder_p (TREE_OPERAND (exp
, 0));
1927 return (contains_placeholder_p (TREE_OPERAND (exp
, 0))
1928 || contains_placeholder_p (TREE_OPERAND (exp
, 1)));
1939 /* Return 1 if EXP contains any expressions that produce cleanups for an
1940 outer scope to deal with. Used by fold. */
1948 if (! TREE_SIDE_EFFECTS (exp
))
1951 switch (TREE_CODE (exp
))
1954 case GOTO_SUBROUTINE_EXPR
:
1955 case WITH_CLEANUP_EXPR
:
1958 case CLEANUP_POINT_EXPR
:
1962 for (exp
= TREE_OPERAND (exp
, 1); exp
; exp
= TREE_CHAIN (exp
))
1964 cmp
= has_cleanups (TREE_VALUE (exp
));
1974 /* This general rule works for most tree codes. All exceptions should be
1975 handled above. If this is a language-specific tree code, we can't
1976 trust what might be in the operand, so say we don't know
1978 if ((int) TREE_CODE (exp
) >= (int) LAST_AND_UNUSED_TREE_CODE
)
1981 nops
= first_rtl_op (TREE_CODE (exp
));
1982 for (i
= 0; i
< nops
; i
++)
1983 if (TREE_OPERAND (exp
, i
) != 0)
1985 int type
= TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp
, i
)));
1986 if (type
== 'e' || type
== '<' || type
== '1' || type
== '2'
1987 || type
== 'r' || type
== 's')
1989 cmp
= has_cleanups (TREE_OPERAND (exp
, i
));
1998 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
1999 return a tree with all occurrences of references to F in a
2000 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
2001 contains only arithmetic expressions or a CALL_EXPR with a
2002 PLACEHOLDER_EXPR occurring only in its arglist. */
2005 substitute_in_expr (exp
, f
, r
)
2010 enum tree_code code
= TREE_CODE (exp
);
2015 switch (TREE_CODE_CLASS (code
))
2022 if (code
== PLACEHOLDER_EXPR
)
2024 else if (code
== TREE_LIST
)
2026 op0
= (TREE_CHAIN (exp
) == 0
2027 ? 0 : substitute_in_expr (TREE_CHAIN (exp
), f
, r
));
2028 op1
= substitute_in_expr (TREE_VALUE (exp
), f
, r
);
2029 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
2032 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
2041 switch (TREE_CODE_LENGTH (code
))
2044 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2045 if (op0
== TREE_OPERAND (exp
, 0))
2048 if (code
== NON_LVALUE_EXPR
)
2051 new = fold (build1 (code
, TREE_TYPE (exp
), op0
));
2055 /* An RTL_EXPR cannot contain a PLACEHOLDER_EXPR; a CONSTRUCTOR
2056 could, but we don't support it. */
2057 if (code
== RTL_EXPR
)
2059 else if (code
== CONSTRUCTOR
)
2062 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2063 op1
= substitute_in_expr (TREE_OPERAND (exp
, 1), f
, r
);
2064 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
2067 new = fold (build (code
, TREE_TYPE (exp
), op0
, op1
));
2071 /* It cannot be that anything inside a SAVE_EXPR contains a
2072 PLACEHOLDER_EXPR. */
2073 if (code
== SAVE_EXPR
)
2076 else if (code
== CALL_EXPR
)
2078 op1
= substitute_in_expr (TREE_OPERAND (exp
, 1), f
, r
);
2079 if (op1
== TREE_OPERAND (exp
, 1))
2082 return build (code
, TREE_TYPE (exp
),
2083 TREE_OPERAND (exp
, 0), op1
, NULL_TREE
);
2086 else if (code
!= COND_EXPR
)
2089 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2090 op1
= substitute_in_expr (TREE_OPERAND (exp
, 1), f
, r
);
2091 op2
= substitute_in_expr (TREE_OPERAND (exp
, 2), f
, r
);
2092 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2093 && op2
== TREE_OPERAND (exp
, 2))
2096 new = fold (build (code
, TREE_TYPE (exp
), op0
, op1
, op2
));
2109 /* If this expression is getting a value from a PLACEHOLDER_EXPR
2110 and it is the right field, replace it with R. */
2111 for (inner
= TREE_OPERAND (exp
, 0);
2112 TREE_CODE_CLASS (TREE_CODE (inner
)) == 'r';
2113 inner
= TREE_OPERAND (inner
, 0))
2115 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
2116 && TREE_OPERAND (exp
, 1) == f
)
2119 /* If this expression hasn't been completed let, leave it
2121 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
2122 && TREE_TYPE (inner
) == 0)
2125 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2126 if (op0
== TREE_OPERAND (exp
, 0))
2129 new = fold (build (code
, TREE_TYPE (exp
), op0
,
2130 TREE_OPERAND (exp
, 1)));
2134 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2135 op1
= substitute_in_expr (TREE_OPERAND (exp
, 1), f
, r
);
2136 op2
= substitute_in_expr (TREE_OPERAND (exp
, 2), f
, r
);
2137 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2138 && op2
== TREE_OPERAND (exp
, 2))
2141 new = fold (build (code
, TREE_TYPE (exp
), op0
, op1
, op2
));
2146 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2147 if (op0
== TREE_OPERAND (exp
, 0))
2150 new = fold (build1 (code
, TREE_TYPE (exp
), op0
));
2162 TREE_READONLY (new) = TREE_READONLY (exp
);
2166 /* Stabilize a reference so that we can use it any number of times
2167 without causing its operands to be evaluated more than once.
2168 Returns the stabilized reference. This works by means of save_expr,
2169 so see the caveats in the comments about save_expr.
2171 Also allows conversion expressions whose operands are references.
2172 Any other kind of expression is returned unchanged. */
2175 stabilize_reference (ref
)
2179 enum tree_code code
= TREE_CODE (ref
);
2186 /* No action is needed in this case. */
2192 case FIX_TRUNC_EXPR
:
2193 case FIX_FLOOR_EXPR
:
2194 case FIX_ROUND_EXPR
:
2196 result
= build_nt (code
, stabilize_reference (TREE_OPERAND (ref
, 0)));
2200 result
= build_nt (INDIRECT_REF
,
2201 stabilize_reference_1 (TREE_OPERAND (ref
, 0)));
2205 result
= build_nt (COMPONENT_REF
,
2206 stabilize_reference (TREE_OPERAND (ref
, 0)),
2207 TREE_OPERAND (ref
, 1));
2211 result
= build_nt (BIT_FIELD_REF
,
2212 stabilize_reference (TREE_OPERAND (ref
, 0)),
2213 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2214 stabilize_reference_1 (TREE_OPERAND (ref
, 2)));
2218 result
= build_nt (ARRAY_REF
,
2219 stabilize_reference (TREE_OPERAND (ref
, 0)),
2220 stabilize_reference_1 (TREE_OPERAND (ref
, 1)));
2223 case ARRAY_RANGE_REF
:
2224 result
= build_nt (ARRAY_RANGE_REF
,
2225 stabilize_reference (TREE_OPERAND (ref
, 0)),
2226 stabilize_reference_1 (TREE_OPERAND (ref
, 1)));
2230 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2231 it wouldn't be ignored. This matters when dealing with
2233 return stabilize_reference_1 (ref
);
2236 result
= build1 (INDIRECT_REF
, TREE_TYPE (ref
),
2237 save_expr (build1 (ADDR_EXPR
,
2238 build_pointer_type (TREE_TYPE (ref
)),
2242 /* If arg isn't a kind of lvalue we recognize, make no change.
2243 Caller should recognize the error for an invalid lvalue. */
2248 return error_mark_node
;
2251 TREE_TYPE (result
) = TREE_TYPE (ref
);
2252 TREE_READONLY (result
) = TREE_READONLY (ref
);
2253 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (ref
);
2254 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (ref
);
2259 /* Subroutine of stabilize_reference; this is called for subtrees of
2260 references. Any expression with side-effects must be put in a SAVE_EXPR
2261 to ensure that it is only evaluated once.
2263 We don't put SAVE_EXPR nodes around everything, because assigning very
2264 simple expressions to temporaries causes us to miss good opportunities
2265 for optimizations. Among other things, the opportunity to fold in the
2266 addition of a constant into an addressing mode often gets lost, e.g.
2267 "y[i+1] += x;". In general, we take the approach that we should not make
2268 an assignment unless we are forced into it - i.e., that any non-side effect
2269 operator should be allowed, and that cse should take care of coalescing
2270 multiple utterances of the same expression should that prove fruitful. */
2273 stabilize_reference_1 (e
)
2277 enum tree_code code
= TREE_CODE (e
);
2279 /* We cannot ignore const expressions because it might be a reference
2280 to a const array but whose index contains side-effects. But we can
2281 ignore things that are actual constant or that already have been
2282 handled by this function. */
2284 if (TREE_CONSTANT (e
) || code
== SAVE_EXPR
)
2287 switch (TREE_CODE_CLASS (code
))
2297 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2298 so that it will only be evaluated once. */
2299 /* The reference (r) and comparison (<) classes could be handled as
2300 below, but it is generally faster to only evaluate them once. */
2301 if (TREE_SIDE_EFFECTS (e
))
2302 return save_expr (e
);
2306 /* Constants need no processing. In fact, we should never reach
2311 /* Division is slow and tends to be compiled with jumps,
2312 especially the division by powers of 2 that is often
2313 found inside of an array reference. So do it just once. */
2314 if (code
== TRUNC_DIV_EXPR
|| code
== TRUNC_MOD_EXPR
2315 || code
== FLOOR_DIV_EXPR
|| code
== FLOOR_MOD_EXPR
2316 || code
== CEIL_DIV_EXPR
|| code
== CEIL_MOD_EXPR
2317 || code
== ROUND_DIV_EXPR
|| code
== ROUND_MOD_EXPR
)
2318 return save_expr (e
);
2319 /* Recursively stabilize each operand. */
2320 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)),
2321 stabilize_reference_1 (TREE_OPERAND (e
, 1)));
2325 /* Recursively stabilize each operand. */
2326 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)));
2333 TREE_TYPE (result
) = TREE_TYPE (e
);
2334 TREE_READONLY (result
) = TREE_READONLY (e
);
2335 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (e
);
2336 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (e
);
2341 /* Low-level constructors for expressions. */
2343 /* Build an expression of code CODE, data type TYPE,
2344 and operands as specified by the arguments ARG1 and following arguments.
2345 Expressions and reference nodes can be created this way.
2346 Constants, decls, types and misc nodes cannot be. */
2349 build
VPARAMS ((enum tree_code code
, tree tt
, ...))
2358 VA_FIXEDARG (p
, enum tree_code
, code
);
2359 VA_FIXEDARG (p
, tree
, tt
);
2361 t
= make_node (code
);
2362 length
= TREE_CODE_LENGTH (code
);
2365 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
2366 result based on those same flags for the arguments. But if the
2367 arguments aren't really even `tree' expressions, we shouldn't be trying
2369 fro
= first_rtl_op (code
);
2371 /* Expressions without side effects may be constant if their
2372 arguments are as well. */
2373 constant
= (TREE_CODE_CLASS (code
) == '<'
2374 || TREE_CODE_CLASS (code
) == '1'
2375 || TREE_CODE_CLASS (code
) == '2'
2376 || TREE_CODE_CLASS (code
) == 'c');
2380 /* This is equivalent to the loop below, but faster. */
2381 tree arg0
= va_arg (p
, tree
);
2382 tree arg1
= va_arg (p
, tree
);
2384 TREE_OPERAND (t
, 0) = arg0
;
2385 TREE_OPERAND (t
, 1) = arg1
;
2386 TREE_READONLY (t
) = 1;
2387 if (arg0
&& fro
> 0)
2389 if (TREE_SIDE_EFFECTS (arg0
))
2390 TREE_SIDE_EFFECTS (t
) = 1;
2391 if (!TREE_READONLY (arg0
))
2392 TREE_READONLY (t
) = 0;
2393 if (!TREE_CONSTANT (arg0
))
2397 if (arg1
&& fro
> 1)
2399 if (TREE_SIDE_EFFECTS (arg1
))
2400 TREE_SIDE_EFFECTS (t
) = 1;
2401 if (!TREE_READONLY (arg1
))
2402 TREE_READONLY (t
) = 0;
2403 if (!TREE_CONSTANT (arg1
))
2407 else if (length
== 1)
2409 tree arg0
= va_arg (p
, tree
);
2411 /* The only one-operand cases we handle here are those with side-effects.
2412 Others are handled with build1. So don't bother checked if the
2413 arg has side-effects since we'll already have set it.
2415 ??? This really should use build1 too. */
2416 if (TREE_CODE_CLASS (code
) != 's')
2418 TREE_OPERAND (t
, 0) = arg0
;
2422 for (i
= 0; i
< length
; i
++)
2424 tree operand
= va_arg (p
, tree
);
2426 TREE_OPERAND (t
, i
) = operand
;
2427 if (operand
&& fro
> i
)
2429 if (TREE_SIDE_EFFECTS (operand
))
2430 TREE_SIDE_EFFECTS (t
) = 1;
2431 if (!TREE_CONSTANT (operand
))
2438 TREE_CONSTANT (t
) = constant
;
2442 /* Same as above, but only builds for unary operators.
2443 Saves lions share of calls to `build'; cuts down use
2444 of varargs, which is expensive for RISC machines. */
2447 build1 (code
, type
, node
)
2448 enum tree_code code
;
2453 #ifdef GATHER_STATISTICS
2454 tree_node_kind kind
;
2458 #ifdef GATHER_STATISTICS
2459 if (TREE_CODE_CLASS (code
) == 'r')
2465 #ifdef ENABLE_CHECKING
2466 if (TREE_CODE_CLASS (code
) == '2'
2467 || TREE_CODE_CLASS (code
) == '<'
2468 || TREE_CODE_LENGTH (code
) != 1)
2470 #endif /* ENABLE_CHECKING */
2472 length
= sizeof (struct tree_exp
);
2474 t
= ggc_alloc_tree (length
);
2476 memset ((PTR
) t
, 0, sizeof (struct tree_common
));
2478 #ifdef GATHER_STATISTICS
2479 tree_node_counts
[(int) kind
]++;
2480 tree_node_sizes
[(int) kind
] += length
;
2483 TREE_SET_CODE (t
, code
);
2485 TREE_TYPE (t
) = type
;
2486 TREE_COMPLEXITY (t
) = 0;
2487 TREE_OPERAND (t
, 0) = node
;
2488 if (node
&& first_rtl_op (code
) != 0)
2490 TREE_SIDE_EFFECTS (t
) = TREE_SIDE_EFFECTS (node
);
2491 TREE_READONLY (t
) = TREE_READONLY (node
);
2500 case PREDECREMENT_EXPR
:
2501 case PREINCREMENT_EXPR
:
2502 case POSTDECREMENT_EXPR
:
2503 case POSTINCREMENT_EXPR
:
2504 /* All of these have side-effects, no matter what their
2506 TREE_SIDE_EFFECTS (t
) = 1;
2507 TREE_READONLY (t
) = 0;
2511 if (TREE_CODE_CLASS (code
) == '1' && node
&& TREE_CONSTANT (node
))
2512 TREE_CONSTANT (t
) = 1;
2519 /* Similar except don't specify the TREE_TYPE
2520 and leave the TREE_SIDE_EFFECTS as 0.
2521 It is permissible for arguments to be null,
2522 or even garbage if their values do not matter. */
2525 build_nt
VPARAMS ((enum tree_code code
, ...))
2532 VA_FIXEDARG (p
, enum tree_code
, code
);
2534 t
= make_node (code
);
2535 length
= TREE_CODE_LENGTH (code
);
2537 for (i
= 0; i
< length
; i
++)
2538 TREE_OPERAND (t
, i
) = va_arg (p
, tree
);
2544 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
2545 We do NOT enter this node in any sort of symbol table.
2547 layout_decl is used to set up the decl's storage layout.
2548 Other slots are initialized to 0 or null pointers. */
2551 build_decl (code
, name
, type
)
2552 enum tree_code code
;
2557 t
= make_node (code
);
2559 /* if (type == error_mark_node)
2560 type = integer_type_node; */
2561 /* That is not done, deliberately, so that having error_mark_node
2562 as the type can suppress useless errors in the use of this variable. */
2564 DECL_NAME (t
) = name
;
2565 TREE_TYPE (t
) = type
;
2567 if (code
== VAR_DECL
|| code
== PARM_DECL
|| code
== RESULT_DECL
)
2569 else if (code
== FUNCTION_DECL
)
2570 DECL_MODE (t
) = FUNCTION_MODE
;
2575 /* BLOCK nodes are used to represent the structure of binding contours
2576 and declarations, once those contours have been exited and their contents
2577 compiled. This information is used for outputting debugging info. */
2580 build_block (vars
, tags
, subblocks
, supercontext
, chain
)
2581 tree vars
, tags ATTRIBUTE_UNUSED
, subblocks
, supercontext
, chain
;
2583 tree block
= make_node (BLOCK
);
2585 BLOCK_VARS (block
) = vars
;
2586 BLOCK_SUBBLOCKS (block
) = subblocks
;
2587 BLOCK_SUPERCONTEXT (block
) = supercontext
;
2588 BLOCK_CHAIN (block
) = chain
;
2592 /* EXPR_WITH_FILE_LOCATION are used to keep track of the exact
2593 location where an expression or an identifier were encountered. It
2594 is necessary for languages where the frontend parser will handle
2595 recursively more than one file (Java is one of them). */
2598 build_expr_wfl (node
, file
, line
, col
)
2603 static const char *last_file
= 0;
2604 static tree last_filenode
= NULL_TREE
;
2605 tree wfl
= make_node (EXPR_WITH_FILE_LOCATION
);
2607 EXPR_WFL_NODE (wfl
) = node
;
2608 EXPR_WFL_SET_LINECOL (wfl
, line
, col
);
2609 if (file
!= last_file
)
2612 last_filenode
= file
? get_identifier (file
) : NULL_TREE
;
2615 EXPR_WFL_FILENAME_NODE (wfl
) = last_filenode
;
2618 TREE_SIDE_EFFECTS (wfl
) = TREE_SIDE_EFFECTS (node
);
2619 TREE_TYPE (wfl
) = TREE_TYPE (node
);
2625 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
2629 build_decl_attribute_variant (ddecl
, attribute
)
2630 tree ddecl
, attribute
;
2632 DECL_ATTRIBUTES (ddecl
) = attribute
;
2636 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
2639 Record such modified types already made so we don't make duplicates. */
2642 build_type_attribute_variant (ttype
, attribute
)
2643 tree ttype
, attribute
;
2645 if ( ! attribute_list_equal (TYPE_ATTRIBUTES (ttype
), attribute
))
2647 unsigned int hashcode
;
2650 ntype
= copy_node (ttype
);
2652 TYPE_POINTER_TO (ntype
) = 0;
2653 TYPE_REFERENCE_TO (ntype
) = 0;
2654 TYPE_ATTRIBUTES (ntype
) = attribute
;
2656 /* Create a new main variant of TYPE. */
2657 TYPE_MAIN_VARIANT (ntype
) = ntype
;
2658 TYPE_NEXT_VARIANT (ntype
) = 0;
2659 set_type_quals (ntype
, TYPE_UNQUALIFIED
);
2661 hashcode
= (TYPE_HASH (TREE_CODE (ntype
))
2662 + TYPE_HASH (TREE_TYPE (ntype
))
2663 + attribute_hash_list (attribute
));
2665 switch (TREE_CODE (ntype
))
2668 hashcode
+= TYPE_HASH (TYPE_ARG_TYPES (ntype
));
2671 hashcode
+= TYPE_HASH (TYPE_DOMAIN (ntype
));
2674 hashcode
+= TYPE_HASH (TYPE_MAX_VALUE (ntype
));
2677 hashcode
+= TYPE_HASH (TYPE_PRECISION (ntype
));
2683 ntype
= type_hash_canon (hashcode
, ntype
);
2684 ttype
= build_qualified_type (ntype
, TYPE_QUALS (ttype
));
2690 /* Default value of targetm.comp_type_attributes that always returns 1. */
2693 default_comp_type_attributes (type1
, type2
)
2694 tree type1 ATTRIBUTE_UNUSED
;
2695 tree type2 ATTRIBUTE_UNUSED
;
2700 /* Default version of targetm.set_default_type_attributes that always does
2704 default_set_default_type_attributes (type
)
2705 tree type ATTRIBUTE_UNUSED
;
2709 /* Default version of targetm.insert_attributes that always does nothing. */
2711 default_insert_attributes (decl
, attr_ptr
)
2712 tree decl ATTRIBUTE_UNUSED
;
2713 tree
*attr_ptr ATTRIBUTE_UNUSED
;
2717 /* Default value of targetm.attribute_table that is empty. */
2718 const struct attribute_spec default_target_attribute_table
[] =
2720 { NULL
, 0, 0, false, false, false, NULL
}
2723 /* Default value of targetm.function_attribute_inlinable_p that always
2726 default_function_attribute_inlinable_p (fndecl
)
2727 tree fndecl ATTRIBUTE_UNUSED
;
2729 /* By default, functions with machine attributes cannot be inlined. */
2733 /* Return non-zero if IDENT is a valid name for attribute ATTR,
2736 We try both `text' and `__text__', ATTR may be either one. */
2737 /* ??? It might be a reasonable simplification to require ATTR to be only
2738 `text'. One might then also require attribute lists to be stored in
2739 their canonicalized form. */
2742 is_attribute_p (attr
, ident
)
2746 int ident_len
, attr_len
;
2749 if (TREE_CODE (ident
) != IDENTIFIER_NODE
)
2752 if (strcmp (attr
, IDENTIFIER_POINTER (ident
)) == 0)
2755 p
= IDENTIFIER_POINTER (ident
);
2756 ident_len
= strlen (p
);
2757 attr_len
= strlen (attr
);
2759 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
2763 || attr
[attr_len
- 2] != '_'
2764 || attr
[attr_len
- 1] != '_')
2766 if (ident_len
== attr_len
- 4
2767 && strncmp (attr
+ 2, p
, attr_len
- 4) == 0)
2772 if (ident_len
== attr_len
+ 4
2773 && p
[0] == '_' && p
[1] == '_'
2774 && p
[ident_len
- 2] == '_' && p
[ident_len
- 1] == '_'
2775 && strncmp (attr
, p
+ 2, attr_len
) == 0)
2782 /* Given an attribute name and a list of attributes, return a pointer to the
2783 attribute's list element if the attribute is part of the list, or NULL_TREE
2784 if not found. If the attribute appears more than once, this only
2785 returns the first occurrence; the TREE_CHAIN of the return value should
2786 be passed back in if further occurrences are wanted. */
2789 lookup_attribute (attr_name
, list
)
2790 const char *attr_name
;
2795 for (l
= list
; l
; l
= TREE_CHAIN (l
))
2797 if (TREE_CODE (TREE_PURPOSE (l
)) != IDENTIFIER_NODE
)
2799 if (is_attribute_p (attr_name
, TREE_PURPOSE (l
)))
2806 /* Return an attribute list that is the union of a1 and a2. */
2809 merge_attributes (a1
, a2
)
2814 /* Either one unset? Take the set one. */
2816 if ((attributes
= a1
) == 0)
2819 /* One that completely contains the other? Take it. */
2821 else if (a2
!= 0 && ! attribute_list_contained (a1
, a2
))
2823 if (attribute_list_contained (a2
, a1
))
2827 /* Pick the longest list, and hang on the other list. */
2829 if (list_length (a1
) < list_length (a2
))
2830 attributes
= a2
, a2
= a1
;
2832 for (; a2
!= 0; a2
= TREE_CHAIN (a2
))
2835 for (a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
2838 a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
2841 if (simple_cst_equal (TREE_VALUE (a
), TREE_VALUE (a2
)) == 1)
2846 a1
= copy_node (a2
);
2847 TREE_CHAIN (a1
) = attributes
;
2856 /* Given types T1 and T2, merge their attributes and return
2860 merge_type_attributes (t1
, t2
)
2863 return merge_attributes (TYPE_ATTRIBUTES (t1
),
2864 TYPE_ATTRIBUTES (t2
));
2867 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
2871 merge_decl_attributes (olddecl
, newdecl
)
2872 tree olddecl
, newdecl
;
2874 return merge_attributes (DECL_ATTRIBUTES (olddecl
),
2875 DECL_ATTRIBUTES (newdecl
));
2878 #ifdef TARGET_DLLIMPORT_DECL_ATTRIBUTES
2880 /* Specialization of merge_decl_attributes for various Windows targets.
2882 This handles the following situation:
2884 __declspec (dllimport) int foo;
2887 The second instance of `foo' nullifies the dllimport. */
2890 merge_dllimport_decl_attributes (old
, new)
2895 int delete_dllimport_p
;
2897 old
= DECL_ATTRIBUTES (old
);
2898 new = DECL_ATTRIBUTES (new);
2900 /* What we need to do here is remove from `old' dllimport if it doesn't
2901 appear in `new'. dllimport behaves like extern: if a declaration is
2902 marked dllimport and a definition appears later, then the object
2903 is not dllimport'd. */
2904 if (lookup_attribute ("dllimport", old
) != NULL_TREE
2905 && lookup_attribute ("dllimport", new) == NULL_TREE
)
2906 delete_dllimport_p
= 1;
2908 delete_dllimport_p
= 0;
2910 a
= merge_attributes (old
, new);
2912 if (delete_dllimport_p
)
2916 /* Scan the list for dllimport and delete it. */
2917 for (prev
= NULL_TREE
, t
= a
; t
; prev
= t
, t
= TREE_CHAIN (t
))
2919 if (is_attribute_p ("dllimport", TREE_PURPOSE (t
)))
2921 if (prev
== NULL_TREE
)
2924 TREE_CHAIN (prev
) = TREE_CHAIN (t
);
2933 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
2935 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
2936 of the various TYPE_QUAL values. */
2939 set_type_quals (type
, type_quals
)
2943 TYPE_READONLY (type
) = (type_quals
& TYPE_QUAL_CONST
) != 0;
2944 TYPE_VOLATILE (type
) = (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
2945 TYPE_RESTRICT (type
) = (type_quals
& TYPE_QUAL_RESTRICT
) != 0;
2948 /* Return a version of the TYPE, qualified as indicated by the
2949 TYPE_QUALS, if one exists. If no qualified version exists yet,
2950 return NULL_TREE. */
2953 get_qualified_type (type
, type_quals
)
2959 /* Search the chain of variants to see if there is already one there just
2960 like the one we need to have. If so, use that existing one. We must
2961 preserve the TYPE_NAME, since there is code that depends on this. */
2962 for (t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
2963 if (TYPE_QUALS (t
) == type_quals
&& TYPE_NAME (t
) == TYPE_NAME (type
))
2969 /* Like get_qualified_type, but creates the type if it does not
2970 exist. This function never returns NULL_TREE. */
2973 build_qualified_type (type
, type_quals
)
2979 /* See if we already have the appropriate qualified variant. */
2980 t
= get_qualified_type (type
, type_quals
);
2982 /* If not, build it. */
2985 t
= build_type_copy (type
);
2986 set_type_quals (t
, type_quals
);
2992 /* Create a new variant of TYPE, equivalent but distinct.
2993 This is so the caller can modify it. */
2996 build_type_copy (type
)
2999 tree t
, m
= TYPE_MAIN_VARIANT (type
);
3001 t
= copy_node (type
);
3003 TYPE_POINTER_TO (t
) = 0;
3004 TYPE_REFERENCE_TO (t
) = 0;
3006 /* Add this type to the chain of variants of TYPE. */
3007 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (m
);
3008 TYPE_NEXT_VARIANT (m
) = t
;
3013 /* Hashing of types so that we don't make duplicates.
3014 The entry point is `type_hash_canon'. */
3016 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
3017 with types in the TREE_VALUE slots), by adding the hash codes
3018 of the individual types. */
3021 type_hash_list (list
)
3024 unsigned int hashcode
;
3027 for (hashcode
= 0, tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3028 hashcode
+= TYPE_HASH (TREE_VALUE (tail
));
3033 /* These are the Hashtable callback functions. */
3035 /* Returns true if the types are equal. */
3038 type_hash_eq (va
, vb
)
3042 const struct type_hash
*a
= va
, *b
= vb
;
3043 if (a
->hash
== b
->hash
3044 && TREE_CODE (a
->type
) == TREE_CODE (b
->type
)
3045 && TREE_TYPE (a
->type
) == TREE_TYPE (b
->type
)
3046 && attribute_list_equal (TYPE_ATTRIBUTES (a
->type
),
3047 TYPE_ATTRIBUTES (b
->type
))
3048 && TYPE_ALIGN (a
->type
) == TYPE_ALIGN (b
->type
)
3049 && (TYPE_MAX_VALUE (a
->type
) == TYPE_MAX_VALUE (b
->type
)
3050 || tree_int_cst_equal (TYPE_MAX_VALUE (a
->type
),
3051 TYPE_MAX_VALUE (b
->type
)))
3052 && (TYPE_MIN_VALUE (a
->type
) == TYPE_MIN_VALUE (b
->type
)
3053 || tree_int_cst_equal (TYPE_MIN_VALUE (a
->type
),
3054 TYPE_MIN_VALUE (b
->type
)))
3055 /* Note that TYPE_DOMAIN is TYPE_ARG_TYPES for FUNCTION_TYPE. */
3056 && (TYPE_DOMAIN (a
->type
) == TYPE_DOMAIN (b
->type
)
3057 || (TYPE_DOMAIN (a
->type
)
3058 && TREE_CODE (TYPE_DOMAIN (a
->type
)) == TREE_LIST
3059 && TYPE_DOMAIN (b
->type
)
3060 && TREE_CODE (TYPE_DOMAIN (b
->type
)) == TREE_LIST
3061 && type_list_equal (TYPE_DOMAIN (a
->type
),
3062 TYPE_DOMAIN (b
->type
)))))
3067 /* Return the cached hash value. */
3070 type_hash_hash (item
)
3073 return ((const struct type_hash
*) item
)->hash
;
3076 /* Look in the type hash table for a type isomorphic to TYPE.
3077 If one is found, return it. Otherwise return 0. */
3080 type_hash_lookup (hashcode
, type
)
3081 unsigned int hashcode
;
3084 struct type_hash
*h
, in
;
3086 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
3087 must call that routine before comparing TYPE_ALIGNs. */
3093 h
= htab_find_with_hash (type_hash_table
, &in
, hashcode
);
3099 /* Add an entry to the type-hash-table
3100 for a type TYPE whose hash code is HASHCODE. */
3103 type_hash_add (hashcode
, type
)
3104 unsigned int hashcode
;
3107 struct type_hash
*h
;
3110 h
= (struct type_hash
*) ggc_alloc (sizeof (struct type_hash
));
3113 loc
= htab_find_slot_with_hash (type_hash_table
, h
, hashcode
, INSERT
);
3114 *(struct type_hash
**) loc
= h
;
3117 /* Given TYPE, and HASHCODE its hash code, return the canonical
3118 object for an identical type if one already exists.
3119 Otherwise, return TYPE, and record it as the canonical object
3120 if it is a permanent object.
3122 To use this function, first create a type of the sort you want.
3123 Then compute its hash code from the fields of the type that
3124 make it different from other similar types.
3125 Then call this function and use the value.
3126 This function frees the type you pass in if it is a duplicate. */
3128 /* Set to 1 to debug without canonicalization. Never set by program. */
3129 int debug_no_type_hash
= 0;
3132 type_hash_canon (hashcode
, type
)
3133 unsigned int hashcode
;
3138 if (debug_no_type_hash
)
3141 /* See if the type is in the hash table already. If so, return it.
3142 Otherwise, add the type. */
3143 t1
= type_hash_lookup (hashcode
, type
);
3146 #ifdef GATHER_STATISTICS
3147 tree_node_counts
[(int) t_kind
]--;
3148 tree_node_sizes
[(int) t_kind
] -= sizeof (struct tree_type
);
3154 type_hash_add (hashcode
, type
);
3159 /* See if the data pointed to by the type hash table is marked. We consider
3160 it marked if the type is marked or if a debug type number or symbol
3161 table entry has been made for the type. This reduces the amount of
3162 debugging output and eliminates that dependency of the debug output on
3163 the number of garbage collections. */
3166 type_hash_marked_p (p
)
3169 tree type
= ((struct type_hash
*) p
)->type
;
3171 return ggc_marked_p (type
) || TYPE_SYMTAB_POINTER (type
);
3174 /* Mark the entry in the type hash table the type it points to is marked.
3175 Also mark the type in case we are considering this entry "marked" by
3176 virtue of TYPE_SYMTAB_POINTER being set. */
3183 ggc_mark_tree (((struct type_hash
*) p
)->type
);
3186 /* Mark the hashtable slot pointed to by ENTRY (which is really a
3187 `tree**') for GC. */
3190 mark_tree_hashtable_entry (entry
, data
)
3192 void *data ATTRIBUTE_UNUSED
;
3194 ggc_mark_tree ((tree
) *entry
);
3198 /* Mark ARG (which is really a htab_t whose slots are trees) for
3202 mark_tree_hashtable (arg
)
3205 htab_t t
= *(htab_t
*) arg
;
3206 htab_traverse (t
, mark_tree_hashtable_entry
, 0);
3210 print_type_hash_statistics ()
3212 fprintf (stderr
, "Type hash: size %ld, %ld elements, %f collisions\n",
3213 (long) htab_size (type_hash_table
),
3214 (long) htab_elements (type_hash_table
),
3215 htab_collisions (type_hash_table
));
3218 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
3219 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
3220 by adding the hash codes of the individual attributes. */
3223 attribute_hash_list (list
)
3226 unsigned int hashcode
;
3229 for (hashcode
= 0, tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3230 /* ??? Do we want to add in TREE_VALUE too? */
3231 hashcode
+= TYPE_HASH (TREE_PURPOSE (tail
));
3235 /* Given two lists of attributes, return true if list l2 is
3236 equivalent to l1. */
3239 attribute_list_equal (l1
, l2
)
3242 return attribute_list_contained (l1
, l2
)
3243 && attribute_list_contained (l2
, l1
);
3246 /* Given two lists of attributes, return true if list L2 is
3247 completely contained within L1. */
3248 /* ??? This would be faster if attribute names were stored in a canonicalized
3249 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
3250 must be used to show these elements are equivalent (which they are). */
3251 /* ??? It's not clear that attributes with arguments will always be handled
3255 attribute_list_contained (l1
, l2
)
3260 /* First check the obvious, maybe the lists are identical. */
3264 /* Maybe the lists are similar. */
3265 for (t1
= l1
, t2
= l2
;
3267 && TREE_PURPOSE (t1
) == TREE_PURPOSE (t2
)
3268 && TREE_VALUE (t1
) == TREE_VALUE (t2
);
3269 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
));
3271 /* Maybe the lists are equal. */
3272 if (t1
== 0 && t2
== 0)
3275 for (; t2
!= 0; t2
= TREE_CHAIN (t2
))
3278 for (attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)), l1
);
3280 attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)),
3283 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) == 1)
3290 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) != 1)
3297 /* Given two lists of types
3298 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
3299 return 1 if the lists contain the same types in the same order.
3300 Also, the TREE_PURPOSEs must match. */
3303 type_list_equal (l1
, l2
)
3308 for (t1
= l1
, t2
= l2
; t1
&& t2
; t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
3309 if (TREE_VALUE (t1
) != TREE_VALUE (t2
)
3310 || (TREE_PURPOSE (t1
) != TREE_PURPOSE (t2
)
3311 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1
), TREE_PURPOSE (t2
))
3312 && (TREE_TYPE (TREE_PURPOSE (t1
))
3313 == TREE_TYPE (TREE_PURPOSE (t2
))))))
3319 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
3320 given by TYPE. If the argument list accepts variable arguments,
3321 then this function counts only the ordinary arguments. */
3324 type_num_arguments (type
)
3330 for (t
= TYPE_ARG_TYPES (type
); t
; t
= TREE_CHAIN (t
))
3331 /* If the function does not take a variable number of arguments,
3332 the last element in the list will have type `void'. */
3333 if (VOID_TYPE_P (TREE_VALUE (t
)))
3341 /* Nonzero if integer constants T1 and T2
3342 represent the same constant value. */
3345 tree_int_cst_equal (t1
, t2
)
3351 if (t1
== 0 || t2
== 0)
3354 if (TREE_CODE (t1
) == INTEGER_CST
3355 && TREE_CODE (t2
) == INTEGER_CST
3356 && TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
3357 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
))
3363 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
3364 The precise way of comparison depends on their data type. */
3367 tree_int_cst_lt (t1
, t2
)
3373 if (! TREE_UNSIGNED (TREE_TYPE (t1
)))
3374 return INT_CST_LT (t1
, t2
);
3376 return INT_CST_LT_UNSIGNED (t1
, t2
);
3379 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
3382 tree_int_cst_compare (t1
, t2
)
3386 if (tree_int_cst_lt (t1
, t2
))
3388 else if (tree_int_cst_lt (t2
, t1
))
3394 /* Return 1 if T is an INTEGER_CST that can be represented in a single
3395 HOST_WIDE_INT value. If POS is nonzero, the result must be positive. */
3398 host_integerp (t
, pos
)
3402 return (TREE_CODE (t
) == INTEGER_CST
3403 && ! TREE_OVERFLOW (t
)
3404 && ((TREE_INT_CST_HIGH (t
) == 0
3405 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) >= 0)
3406 || (! pos
&& TREE_INT_CST_HIGH (t
) == -1
3407 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0)
3408 || (! pos
&& TREE_INT_CST_HIGH (t
) == 0
3409 && TREE_UNSIGNED (TREE_TYPE (t
)))));
3412 /* Return the HOST_WIDE_INT least significant bits of T if it is an
3413 INTEGER_CST and there is no overflow. POS is nonzero if the result must
3414 be positive. Abort if we cannot satisfy the above conditions. */
3417 tree_low_cst (t
, pos
)
3421 if (host_integerp (t
, pos
))
3422 return TREE_INT_CST_LOW (t
);
3427 /* Return the most significant bit of the integer constant T. */
3430 tree_int_cst_msb (t
)
3435 unsigned HOST_WIDE_INT l
;
3437 /* Note that using TYPE_PRECISION here is wrong. We care about the
3438 actual bits, not the (arbitrary) range of the type. */
3439 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t
))) - 1;
3440 rshift_double (TREE_INT_CST_LOW (t
), TREE_INT_CST_HIGH (t
), prec
,
3441 2 * HOST_BITS_PER_WIDE_INT
, &l
, &h
, 0);
3442 return (l
& 1) == 1;
3445 /* Return an indication of the sign of the integer constant T.
3446 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
3447 Note that -1 will never be returned it T's type is unsigned. */
3450 tree_int_cst_sgn (t
)
3453 if (TREE_INT_CST_LOW (t
) == 0 && TREE_INT_CST_HIGH (t
) == 0)
3455 else if (TREE_UNSIGNED (TREE_TYPE (t
)))
3457 else if (TREE_INT_CST_HIGH (t
) < 0)
3463 /* Compare two constructor-element-type constants. Return 1 if the lists
3464 are known to be equal; otherwise return 0. */
3467 simple_cst_list_equal (l1
, l2
)
3470 while (l1
!= NULL_TREE
&& l2
!= NULL_TREE
)
3472 if (simple_cst_equal (TREE_VALUE (l1
), TREE_VALUE (l2
)) != 1)
3475 l1
= TREE_CHAIN (l1
);
3476 l2
= TREE_CHAIN (l2
);
3482 /* Return truthvalue of whether T1 is the same tree structure as T2.
3483 Return 1 if they are the same.
3484 Return 0 if they are understandably different.
3485 Return -1 if either contains tree structure not understood by
3489 simple_cst_equal (t1
, t2
)
3492 enum tree_code code1
, code2
;
3498 if (t1
== 0 || t2
== 0)
3501 code1
= TREE_CODE (t1
);
3502 code2
= TREE_CODE (t2
);
3504 if (code1
== NOP_EXPR
|| code1
== CONVERT_EXPR
|| code1
== NON_LVALUE_EXPR
)
3506 if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
3507 || code2
== NON_LVALUE_EXPR
)
3508 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3510 return simple_cst_equal (TREE_OPERAND (t1
, 0), t2
);
3513 else if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
3514 || code2
== NON_LVALUE_EXPR
)
3515 return simple_cst_equal (t1
, TREE_OPERAND (t2
, 0));
3523 return (TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
3524 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
));
3527 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3530 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3531 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3532 TREE_STRING_LENGTH (t1
)));
3535 if (CONSTRUCTOR_ELTS (t1
) == CONSTRUCTOR_ELTS (t2
))
3541 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3544 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3548 simple_cst_list_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
3551 /* Special case: if either target is an unallocated VAR_DECL,
3552 it means that it's going to be unified with whatever the
3553 TARGET_EXPR is really supposed to initialize, so treat it
3554 as being equivalent to anything. */
3555 if ((TREE_CODE (TREE_OPERAND (t1
, 0)) == VAR_DECL
3556 && DECL_NAME (TREE_OPERAND (t1
, 0)) == NULL_TREE
3557 && !DECL_RTL_SET_P (TREE_OPERAND (t1
, 0)))
3558 || (TREE_CODE (TREE_OPERAND (t2
, 0)) == VAR_DECL
3559 && DECL_NAME (TREE_OPERAND (t2
, 0)) == NULL_TREE
3560 && !DECL_RTL_SET_P (TREE_OPERAND (t2
, 0))))
3563 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3568 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
3570 case WITH_CLEANUP_EXPR
:
3571 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3575 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t1
, 1));
3578 if (TREE_OPERAND (t1
, 1) == TREE_OPERAND (t2
, 1))
3579 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3593 /* This general rule works for most tree codes. All exceptions should be
3594 handled above. If this is a language-specific tree code, we can't
3595 trust what might be in the operand, so say we don't know
3597 if ((int) code1
>= (int) LAST_AND_UNUSED_TREE_CODE
)
3600 switch (TREE_CODE_CLASS (code1
))
3609 for (i
= 0; i
< TREE_CODE_LENGTH (code1
); i
++)
3611 cmp
= simple_cst_equal (TREE_OPERAND (t1
, i
), TREE_OPERAND (t2
, i
));
3623 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
3624 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
3625 than U, respectively. */
3628 compare_tree_int (t
, u
)
3632 if (tree_int_cst_sgn (t
) < 0)
3634 else if (TREE_INT_CST_HIGH (t
) != 0)
3636 else if (TREE_INT_CST_LOW (t
) == u
)
3638 else if (TREE_INT_CST_LOW (t
) < u
)
3644 /* Constructors for pointer, array and function types.
3645 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
3646 constructed by language-dependent code, not here.) */
3648 /* Construct, lay out and return the type of pointers to TO_TYPE.
3649 If such a type has already been constructed, reuse it. */
3652 build_pointer_type (to_type
)
3655 tree t
= TYPE_POINTER_TO (to_type
);
3657 /* First, if we already have a type for pointers to TO_TYPE, use it. */
3662 /* We need a new one. */
3663 t
= make_node (POINTER_TYPE
);
3665 TREE_TYPE (t
) = to_type
;
3667 /* Record this type as the pointer to TO_TYPE. */
3668 TYPE_POINTER_TO (to_type
) = t
;
3670 /* Lay out the type. This function has many callers that are concerned
3671 with expression-construction, and this simplifies them all.
3672 Also, it guarantees the TYPE_SIZE is in the same obstack as the type. */
3678 /* Build the node for the type of references-to-TO_TYPE. */
3681 build_reference_type (to_type
)
3684 tree t
= TYPE_REFERENCE_TO (to_type
);
3686 /* First, if we already have a type for pointers to TO_TYPE, use it. */
3691 /* We need a new one. */
3692 t
= make_node (REFERENCE_TYPE
);
3694 TREE_TYPE (t
) = to_type
;
3696 /* Record this type as the pointer to TO_TYPE. */
3697 TYPE_REFERENCE_TO (to_type
) = t
;
3704 /* Build a type that is compatible with t but has no cv quals anywhere
3707 const char *const *const * -> char ***. */
3710 build_type_no_quals (t
)
3713 switch (TREE_CODE (t
))
3716 return build_pointer_type (build_type_no_quals (TREE_TYPE (t
)));
3717 case REFERENCE_TYPE
:
3718 return build_reference_type (build_type_no_quals (TREE_TYPE (t
)));
3720 return TYPE_MAIN_VARIANT (t
);
3724 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
3725 MAXVAL should be the maximum value in the domain
3726 (one less than the length of the array).
3728 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
3729 We don't enforce this limit, that is up to caller (e.g. language front end).
3730 The limit exists because the result is a signed type and we don't handle
3731 sizes that use more than one HOST_WIDE_INT. */
3734 build_index_type (maxval
)
3737 tree itype
= make_node (INTEGER_TYPE
);
3739 TREE_TYPE (itype
) = sizetype
;
3740 TYPE_PRECISION (itype
) = TYPE_PRECISION (sizetype
);
3741 TYPE_MIN_VALUE (itype
) = size_zero_node
;
3742 TYPE_MAX_VALUE (itype
) = convert (sizetype
, maxval
);
3743 TYPE_MODE (itype
) = TYPE_MODE (sizetype
);
3744 TYPE_SIZE (itype
) = TYPE_SIZE (sizetype
);
3745 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (sizetype
);
3746 TYPE_ALIGN (itype
) = TYPE_ALIGN (sizetype
);
3747 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (sizetype
);
3749 if (host_integerp (maxval
, 1))
3750 return type_hash_canon (tree_low_cst (maxval
, 1), itype
);
3755 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
3756 ENUMERAL_TYPE, BOOLEAN_TYPE, or CHAR_TYPE), with
3757 low bound LOWVAL and high bound HIGHVAL.
3758 if TYPE==NULL_TREE, sizetype is used. */
3761 build_range_type (type
, lowval
, highval
)
3762 tree type
, lowval
, highval
;
3764 tree itype
= make_node (INTEGER_TYPE
);
3766 TREE_TYPE (itype
) = type
;
3767 if (type
== NULL_TREE
)
3770 TYPE_MIN_VALUE (itype
) = convert (type
, lowval
);
3771 TYPE_MAX_VALUE (itype
) = highval
? convert (type
, highval
) : NULL
;
3773 TYPE_PRECISION (itype
) = TYPE_PRECISION (type
);
3774 TYPE_MODE (itype
) = TYPE_MODE (type
);
3775 TYPE_SIZE (itype
) = TYPE_SIZE (type
);
3776 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (type
);
3777 TYPE_ALIGN (itype
) = TYPE_ALIGN (type
);
3778 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (type
);
3780 if (host_integerp (lowval
, 0) && highval
!= 0 && host_integerp (highval
, 0))
3781 return type_hash_canon (tree_low_cst (highval
, 0)
3782 - tree_low_cst (lowval
, 0),
3788 /* Just like build_index_type, but takes lowval and highval instead
3789 of just highval (maxval). */
3792 build_index_2_type (lowval
,highval
)
3793 tree lowval
, highval
;
3795 return build_range_type (sizetype
, lowval
, highval
);
3798 /* Return nonzero iff ITYPE1 and ITYPE2 are equal (in the LISP sense).
3799 Needed because when index types are not hashed, equal index types
3800 built at different times appear distinct, even though structurally,
3804 index_type_equal (itype1
, itype2
)
3805 tree itype1
, itype2
;
3807 if (TREE_CODE (itype1
) != TREE_CODE (itype2
))
3810 if (TREE_CODE (itype1
) == INTEGER_TYPE
)
3812 if (TYPE_PRECISION (itype1
) != TYPE_PRECISION (itype2
)
3813 || TYPE_MODE (itype1
) != TYPE_MODE (itype2
)
3814 || simple_cst_equal (TYPE_SIZE (itype1
), TYPE_SIZE (itype2
)) != 1
3815 || TYPE_ALIGN (itype1
) != TYPE_ALIGN (itype2
))
3818 if (1 == simple_cst_equal (TYPE_MIN_VALUE (itype1
),
3819 TYPE_MIN_VALUE (itype2
))
3820 && 1 == simple_cst_equal (TYPE_MAX_VALUE (itype1
),
3821 TYPE_MAX_VALUE (itype2
)))
3828 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
3829 and number of elements specified by the range of values of INDEX_TYPE.
3830 If such a type has already been constructed, reuse it. */
3833 build_array_type (elt_type
, index_type
)
3834 tree elt_type
, index_type
;
3837 unsigned int hashcode
;
3839 if (TREE_CODE (elt_type
) == FUNCTION_TYPE
)
3841 error ("arrays of functions are not meaningful");
3842 elt_type
= integer_type_node
;
3845 /* Make sure TYPE_POINTER_TO (elt_type) is filled in. */
3846 build_pointer_type (elt_type
);
3848 /* Allocate the array after the pointer type,
3849 in case we free it in type_hash_canon. */
3850 t
= make_node (ARRAY_TYPE
);
3851 TREE_TYPE (t
) = elt_type
;
3852 TYPE_DOMAIN (t
) = index_type
;
3854 if (index_type
== 0)
3859 hashcode
= TYPE_HASH (elt_type
) + TYPE_HASH (index_type
);
3860 t
= type_hash_canon (hashcode
, t
);
3862 if (!COMPLETE_TYPE_P (t
))
3867 /* Return the TYPE of the elements comprising
3868 the innermost dimension of ARRAY. */
3871 get_inner_array_type (array
)
3874 tree type
= TREE_TYPE (array
);
3876 while (TREE_CODE (type
) == ARRAY_TYPE
)
3877 type
= TREE_TYPE (type
);
3882 /* Construct, lay out and return
3883 the type of functions returning type VALUE_TYPE
3884 given arguments of types ARG_TYPES.
3885 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
3886 are data type nodes for the arguments of the function.
3887 If such a type has already been constructed, reuse it. */
3890 build_function_type (value_type
, arg_types
)
3891 tree value_type
, arg_types
;
3894 unsigned int hashcode
;
3896 if (TREE_CODE (value_type
) == FUNCTION_TYPE
)
3898 error ("function return type cannot be function");
3899 value_type
= integer_type_node
;
3902 /* Make a node of the sort we want. */
3903 t
= make_node (FUNCTION_TYPE
);
3904 TREE_TYPE (t
) = value_type
;
3905 TYPE_ARG_TYPES (t
) = arg_types
;
3907 /* If we already have such a type, use the old one and free this one. */
3908 hashcode
= TYPE_HASH (value_type
) + type_hash_list (arg_types
);
3909 t
= type_hash_canon (hashcode
, t
);
3911 if (!COMPLETE_TYPE_P (t
))
3916 /* Construct, lay out and return the type of methods belonging to class
3917 BASETYPE and whose arguments and values are described by TYPE.
3918 If that type exists already, reuse it.
3919 TYPE must be a FUNCTION_TYPE node. */
3922 build_method_type (basetype
, type
)
3923 tree basetype
, type
;
3926 unsigned int hashcode
;
3928 /* Make a node of the sort we want. */
3929 t
= make_node (METHOD_TYPE
);
3931 if (TREE_CODE (type
) != FUNCTION_TYPE
)
3934 TYPE_METHOD_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
3935 TREE_TYPE (t
) = TREE_TYPE (type
);
3937 /* The actual arglist for this function includes a "hidden" argument
3938 which is "this". Put it into the list of argument types. */
3941 = tree_cons (NULL_TREE
,
3942 build_pointer_type (basetype
), TYPE_ARG_TYPES (type
));
3944 /* If we already have such a type, use the old one and free this one. */
3945 hashcode
= TYPE_HASH (basetype
) + TYPE_HASH (type
);
3946 t
= type_hash_canon (hashcode
, t
);
3948 if (!COMPLETE_TYPE_P (t
))
3954 /* Construct, lay out and return the type of offsets to a value
3955 of type TYPE, within an object of type BASETYPE.
3956 If a suitable offset type exists already, reuse it. */
3959 build_offset_type (basetype
, type
)
3960 tree basetype
, type
;
3963 unsigned int hashcode
;
3965 /* Make a node of the sort we want. */
3966 t
= make_node (OFFSET_TYPE
);
3968 TYPE_OFFSET_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
3969 TREE_TYPE (t
) = type
;
3971 /* If we already have such a type, use the old one and free this one. */
3972 hashcode
= TYPE_HASH (basetype
) + TYPE_HASH (type
);
3973 t
= type_hash_canon (hashcode
, t
);
3975 if (!COMPLETE_TYPE_P (t
))
3981 /* Create a complex type whose components are COMPONENT_TYPE. */
3984 build_complex_type (component_type
)
3985 tree component_type
;
3988 unsigned int hashcode
;
3990 /* Make a node of the sort we want. */
3991 t
= make_node (COMPLEX_TYPE
);
3993 TREE_TYPE (t
) = TYPE_MAIN_VARIANT (component_type
);
3994 set_type_quals (t
, TYPE_QUALS (component_type
));
3996 /* If we already have such a type, use the old one and free this one. */
3997 hashcode
= TYPE_HASH (component_type
);
3998 t
= type_hash_canon (hashcode
, t
);
4000 if (!COMPLETE_TYPE_P (t
))
4003 /* If we are writing Dwarf2 output we need to create a name,
4004 since complex is a fundamental type. */
4005 if ((write_symbols
== DWARF2_DEBUG
|| write_symbols
== VMS_AND_DWARF2_DEBUG
)
4009 if (component_type
== char_type_node
)
4010 name
= "complex char";
4011 else if (component_type
== signed_char_type_node
)
4012 name
= "complex signed char";
4013 else if (component_type
== unsigned_char_type_node
)
4014 name
= "complex unsigned char";
4015 else if (component_type
== short_integer_type_node
)
4016 name
= "complex short int";
4017 else if (component_type
== short_unsigned_type_node
)
4018 name
= "complex short unsigned int";
4019 else if (component_type
== integer_type_node
)
4020 name
= "complex int";
4021 else if (component_type
== unsigned_type_node
)
4022 name
= "complex unsigned int";
4023 else if (component_type
== long_integer_type_node
)
4024 name
= "complex long int";
4025 else if (component_type
== long_unsigned_type_node
)
4026 name
= "complex long unsigned int";
4027 else if (component_type
== long_long_integer_type_node
)
4028 name
= "complex long long int";
4029 else if (component_type
== long_long_unsigned_type_node
)
4030 name
= "complex long long unsigned int";
4035 TYPE_NAME (t
) = get_identifier (name
);
4041 /* Return OP, stripped of any conversions to wider types as much as is safe.
4042 Converting the value back to OP's type makes a value equivalent to OP.
4044 If FOR_TYPE is nonzero, we return a value which, if converted to
4045 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
4047 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
4048 narrowest type that can hold the value, even if they don't exactly fit.
4049 Otherwise, bit-field references are changed to a narrower type
4050 only if they can be fetched directly from memory in that type.
4052 OP must have integer, real or enumeral type. Pointers are not allowed!
4054 There are some cases where the obvious value we could return
4055 would regenerate to OP if converted to OP's type,
4056 but would not extend like OP to wider types.
4057 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
4058 For example, if OP is (unsigned short)(signed char)-1,
4059 we avoid returning (signed char)-1 if FOR_TYPE is int,
4060 even though extending that to an unsigned short would regenerate OP,
4061 since the result of extending (signed char)-1 to (int)
4062 is different from (int) OP. */
4065 get_unwidened (op
, for_type
)
4069 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
4070 tree type
= TREE_TYPE (op
);
4072 = TYPE_PRECISION (for_type
!= 0 ? for_type
: type
);
4074 = (for_type
!= 0 && for_type
!= type
4075 && final_prec
> TYPE_PRECISION (type
)
4076 && TREE_UNSIGNED (type
));
4079 while (TREE_CODE (op
) == NOP_EXPR
)
4082 = TYPE_PRECISION (TREE_TYPE (op
))
4083 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0)));
4085 /* Truncations are many-one so cannot be removed.
4086 Unless we are later going to truncate down even farther. */
4088 && final_prec
> TYPE_PRECISION (TREE_TYPE (op
)))
4091 /* See what's inside this conversion. If we decide to strip it,
4093 op
= TREE_OPERAND (op
, 0);
4095 /* If we have not stripped any zero-extensions (uns is 0),
4096 we can strip any kind of extension.
4097 If we have previously stripped a zero-extension,
4098 only zero-extensions can safely be stripped.
4099 Any extension can be stripped if the bits it would produce
4100 are all going to be discarded later by truncating to FOR_TYPE. */
4104 if (! uns
|| final_prec
<= TYPE_PRECISION (TREE_TYPE (op
)))
4106 /* TREE_UNSIGNED says whether this is a zero-extension.
4107 Let's avoid computing it if it does not affect WIN
4108 and if UNS will not be needed again. */
4109 if ((uns
|| TREE_CODE (op
) == NOP_EXPR
)
4110 && TREE_UNSIGNED (TREE_TYPE (op
)))
4118 if (TREE_CODE (op
) == COMPONENT_REF
4119 /* Since type_for_size always gives an integer type. */
4120 && TREE_CODE (type
) != REAL_TYPE
4121 /* Don't crash if field not laid out yet. */
4122 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
4123 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
4125 unsigned int innerprec
4126 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
4128 type
= type_for_size (innerprec
, TREE_UNSIGNED (TREE_OPERAND (op
, 1)));
4130 /* We can get this structure field in the narrowest type it fits in.
4131 If FOR_TYPE is 0, do this only for a field that matches the
4132 narrower type exactly and is aligned for it
4133 The resulting extension to its nominal type (a fullword type)
4134 must fit the same conditions as for other extensions. */
4136 if (innerprec
< TYPE_PRECISION (TREE_TYPE (op
))
4137 && (for_type
|| ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1)))
4138 && (! uns
|| final_prec
<= innerprec
4139 || TREE_UNSIGNED (TREE_OPERAND (op
, 1)))
4142 win
= build (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
4143 TREE_OPERAND (op
, 1));
4144 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
4145 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
4152 /* Return OP or a simpler expression for a narrower value
4153 which can be sign-extended or zero-extended to give back OP.
4154 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
4155 or 0 if the value should be sign-extended. */
4158 get_narrower (op
, unsignedp_ptr
)
4166 while (TREE_CODE (op
) == NOP_EXPR
)
4169 = (TYPE_PRECISION (TREE_TYPE (op
))
4170 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0))));
4172 /* Truncations are many-one so cannot be removed. */
4176 /* See what's inside this conversion. If we decide to strip it,
4178 op
= TREE_OPERAND (op
, 0);
4182 /* An extension: the outermost one can be stripped,
4183 but remember whether it is zero or sign extension. */
4185 uns
= TREE_UNSIGNED (TREE_TYPE (op
));
4186 /* Otherwise, if a sign extension has been stripped,
4187 only sign extensions can now be stripped;
4188 if a zero extension has been stripped, only zero-extensions. */
4189 else if (uns
!= TREE_UNSIGNED (TREE_TYPE (op
)))
4193 else /* bitschange == 0 */
4195 /* A change in nominal type can always be stripped, but we must
4196 preserve the unsignedness. */
4198 uns
= TREE_UNSIGNED (TREE_TYPE (op
));
4205 if (TREE_CODE (op
) == COMPONENT_REF
4206 /* Since type_for_size always gives an integer type. */
4207 && TREE_CODE (TREE_TYPE (op
)) != REAL_TYPE
4208 /* Ensure field is laid out already. */
4209 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0)
4211 unsigned HOST_WIDE_INT innerprec
4212 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
4213 tree type
= type_for_size (innerprec
, TREE_UNSIGNED (op
));
4215 /* We can get this structure field in a narrower type that fits it,
4216 but the resulting extension to its nominal type (a fullword type)
4217 must satisfy the same conditions as for other extensions.
4219 Do this only for fields that are aligned (not bit-fields),
4220 because when bit-field insns will be used there is no
4221 advantage in doing this. */
4223 if (innerprec
< TYPE_PRECISION (TREE_TYPE (op
))
4224 && ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1))
4225 && (first
|| uns
== TREE_UNSIGNED (TREE_OPERAND (op
, 1)))
4229 uns
= TREE_UNSIGNED (TREE_OPERAND (op
, 1));
4230 win
= build (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
4231 TREE_OPERAND (op
, 1));
4232 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
4233 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
4236 *unsignedp_ptr
= uns
;
4240 /* Nonzero if integer constant C has a value that is permissible
4241 for type TYPE (an INTEGER_TYPE). */
4244 int_fits_type_p (c
, type
)
4247 /* If the bounds of the type are integers, we can check ourselves.
4248 Otherwise,. use force_fit_type, which checks against the precision. */
4249 if (TYPE_MAX_VALUE (type
) != NULL_TREE
4250 && TYPE_MIN_VALUE (type
) != NULL_TREE
4251 && TREE_CODE (TYPE_MAX_VALUE (type
)) == INTEGER_CST
4252 && TREE_CODE (TYPE_MIN_VALUE (type
)) == INTEGER_CST
)
4254 if (TREE_UNSIGNED (type
))
4255 return (! INT_CST_LT_UNSIGNED (TYPE_MAX_VALUE (type
), c
)
4256 && ! INT_CST_LT_UNSIGNED (c
, TYPE_MIN_VALUE (type
))
4257 /* Negative ints never fit unsigned types. */
4258 && ! (TREE_INT_CST_HIGH (c
) < 0
4259 && ! TREE_UNSIGNED (TREE_TYPE (c
))));
4261 return (! INT_CST_LT (TYPE_MAX_VALUE (type
), c
)
4262 && ! INT_CST_LT (c
, TYPE_MIN_VALUE (type
))
4263 /* Unsigned ints with top bit set never fit signed types. */
4264 && ! (TREE_INT_CST_HIGH (c
) < 0
4265 && TREE_UNSIGNED (TREE_TYPE (c
))));
4270 TREE_TYPE (c
) = type
;
4271 return !force_fit_type (c
, 0);
4275 /* Given a DECL or TYPE, return the scope in which it was declared, or
4276 NULL_TREE if there is no containing scope. */
4279 get_containing_scope (t
)
4282 return (TYPE_P (t
) ? TYPE_CONTEXT (t
) : DECL_CONTEXT (t
));
4285 /* Return the innermost context enclosing DECL that is
4286 a FUNCTION_DECL, or zero if none. */
4289 decl_function_context (decl
)
4294 if (TREE_CODE (decl
) == ERROR_MARK
)
4297 if (TREE_CODE (decl
) == SAVE_EXPR
)
4298 context
= SAVE_EXPR_CONTEXT (decl
);
4300 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
4301 where we look up the function at runtime. Such functions always take
4302 a first argument of type 'pointer to real context'.
4304 C++ should really be fixed to use DECL_CONTEXT for the real context,
4305 and use something else for the "virtual context". */
4306 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_VINDEX (decl
))
4309 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl
)))));
4311 context
= DECL_CONTEXT (decl
);
4313 while (context
&& TREE_CODE (context
) != FUNCTION_DECL
)
4315 if (TREE_CODE (context
) == BLOCK
)
4316 context
= BLOCK_SUPERCONTEXT (context
);
4318 context
= get_containing_scope (context
);
4324 /* Return the innermost context enclosing DECL that is
4325 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
4326 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
4329 decl_type_context (decl
)
4332 tree context
= DECL_CONTEXT (decl
);
4336 if (TREE_CODE (context
) == RECORD_TYPE
4337 || TREE_CODE (context
) == UNION_TYPE
4338 || TREE_CODE (context
) == QUAL_UNION_TYPE
)
4341 if (TREE_CODE (context
) == TYPE_DECL
4342 || TREE_CODE (context
) == FUNCTION_DECL
)
4343 context
= DECL_CONTEXT (context
);
4345 else if (TREE_CODE (context
) == BLOCK
)
4346 context
= BLOCK_SUPERCONTEXT (context
);
4349 /* Unhandled CONTEXT!? */
4355 /* CALL is a CALL_EXPR. Return the declaration for the function
4356 called, or NULL_TREE if the called function cannot be
4360 get_callee_fndecl (call
)
4365 /* It's invalid to call this function with anything but a
4367 if (TREE_CODE (call
) != CALL_EXPR
)
4370 /* The first operand to the CALL is the address of the function
4372 addr
= TREE_OPERAND (call
, 0);
4376 /* If this is a readonly function pointer, extract its initial value. */
4377 if (DECL_P (addr
) && TREE_CODE (addr
) != FUNCTION_DECL
4378 && TREE_READONLY (addr
) && ! TREE_THIS_VOLATILE (addr
)
4379 && DECL_INITIAL (addr
))
4380 addr
= DECL_INITIAL (addr
);
4382 /* If the address is just `&f' for some function `f', then we know
4383 that `f' is being called. */
4384 if (TREE_CODE (addr
) == ADDR_EXPR
4385 && TREE_CODE (TREE_OPERAND (addr
, 0)) == FUNCTION_DECL
)
4386 return TREE_OPERAND (addr
, 0);
4388 /* We couldn't figure out what was being called. */
4392 /* Print debugging information about the obstack O, named STR. */
4395 print_obstack_statistics (str
, o
)
4399 struct _obstack_chunk
*chunk
= o
->chunk
;
4403 n_alloc
+= o
->next_free
- chunk
->contents
;
4404 chunk
= chunk
->prev
;
4408 n_alloc
+= chunk
->limit
- &chunk
->contents
[0];
4409 chunk
= chunk
->prev
;
4411 fprintf (stderr
, "obstack %s: %u bytes, %d chunks\n",
4412 str
, n_alloc
, n_chunks
);
4415 /* Print debugging information about tree nodes generated during the compile,
4416 and any language-specific information. */
4419 dump_tree_statistics ()
4421 #ifdef GATHER_STATISTICS
4423 int total_nodes
, total_bytes
;
4426 fprintf (stderr
, "\n??? tree nodes created\n\n");
4427 #ifdef GATHER_STATISTICS
4428 fprintf (stderr
, "Kind Nodes Bytes\n");
4429 fprintf (stderr
, "-------------------------------------\n");
4430 total_nodes
= total_bytes
= 0;
4431 for (i
= 0; i
< (int) all_kinds
; i
++)
4433 fprintf (stderr
, "%-20s %6d %9d\n", tree_node_kind_names
[i
],
4434 tree_node_counts
[i
], tree_node_sizes
[i
]);
4435 total_nodes
+= tree_node_counts
[i
];
4436 total_bytes
+= tree_node_sizes
[i
];
4438 fprintf (stderr
, "-------------------------------------\n");
4439 fprintf (stderr
, "%-20s %6d %9d\n", "Total", total_nodes
, total_bytes
);
4440 fprintf (stderr
, "-------------------------------------\n");
4442 fprintf (stderr
, "(No per-node statistics)\n");
4444 print_obstack_statistics ("permanent_obstack", &permanent_obstack
);
4445 print_type_hash_statistics ();
4446 (*lang_hooks
.print_statistics
) ();
4449 #define FILE_FUNCTION_PREFIX_LEN 9
4451 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
4453 /* Appends 6 random characters to TEMPLATE to (hopefully) avoid name
4454 clashes in cases where we can't reliably choose a unique name.
4456 Derived from mkstemp.c in libiberty. */
4459 append_random_chars (template)
4462 static const char letters
[]
4463 = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
4464 static unsigned HOST_WIDE_INT value
;
4465 unsigned HOST_WIDE_INT v
;
4471 /* VALUE should be unique for each file and must not change between
4472 compiles since this can cause bootstrap comparison errors. */
4474 if (stat (main_input_filename
, &st
) < 0)
4477 /* In VMS, ino is an array, so we have to use both values. We
4478 conditionalize that. */
4480 #define INO_TO_INT(INO) ((int) (INO)[1] << 16 ^ (int) (INO)[2])
4482 #define INO_TO_INT(INO) INO
4484 value
= st
.st_dev
^ INO_TO_INT (st
.st_ino
) ^ st
.st_mtime
;
4487 template += strlen (template);
4491 /* Fill in the random bits. */
4492 template[0] = letters
[v
% 62];
4494 template[1] = letters
[v
% 62];
4496 template[2] = letters
[v
% 62];
4498 template[3] = letters
[v
% 62];
4500 template[4] = letters
[v
% 62];
4502 template[5] = letters
[v
% 62];
4507 /* P is a string that will be used in a symbol. Mask out any characters
4508 that are not valid in that context. */
4511 clean_symbol_name (p
)
4516 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
4519 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
4526 /* Generate a name for a function unique to this translation unit.
4527 TYPE is some string to identify the purpose of this function to the
4528 linker or collect2. */
4531 get_file_function_name_long (type
)
4538 if (first_global_object_name
)
4539 p
= first_global_object_name
;
4542 /* We don't have anything that we know to be unique to this translation
4543 unit, so use what we do have and throw in some randomness. */
4545 const char *name
= weak_global_object_name
;
4546 const char *file
= main_input_filename
;
4551 file
= input_filename
;
4553 q
= (char *) alloca (7 + strlen (name
) + strlen (file
));
4555 sprintf (q
, "%s%s", name
, file
);
4556 append_random_chars (q
);
4560 buf
= (char *) alloca (sizeof (FILE_FUNCTION_FORMAT
) + strlen (p
)
4563 /* Set up the name of the file-level functions we may need.
4564 Use a global object (which is already required to be unique over
4565 the program) rather than the file name (which imposes extra
4567 sprintf (buf
, FILE_FUNCTION_FORMAT
, type
, p
);
4569 /* Don't need to pull weird characters out of global names. */
4570 if (p
!= first_global_object_name
)
4571 clean_symbol_name (buf
+ 11);
4573 return get_identifier (buf
);
4576 /* If KIND=='I', return a suitable global initializer (constructor) name.
4577 If KIND=='D', return a suitable global clean-up (destructor) name. */
4580 get_file_function_name (kind
)
4588 return get_file_function_name_long (p
);
4591 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
4592 The result is placed in BUFFER (which has length BIT_SIZE),
4593 with one bit in each char ('\000' or '\001').
4595 If the constructor is constant, NULL_TREE is returned.
4596 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
4599 get_set_constructor_bits (init
, buffer
, bit_size
)
4606 HOST_WIDE_INT domain_min
4607 = tree_low_cst (TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (init
))), 0);
4608 tree non_const_bits
= NULL_TREE
;
4610 for (i
= 0; i
< bit_size
; i
++)
4613 for (vals
= TREE_OPERAND (init
, 1);
4614 vals
!= NULL_TREE
; vals
= TREE_CHAIN (vals
))
4616 if (!host_integerp (TREE_VALUE (vals
), 0)
4617 || (TREE_PURPOSE (vals
) != NULL_TREE
4618 && !host_integerp (TREE_PURPOSE (vals
), 0)))
4620 = tree_cons (TREE_PURPOSE (vals
), TREE_VALUE (vals
), non_const_bits
);
4621 else if (TREE_PURPOSE (vals
) != NULL_TREE
)
4623 /* Set a range of bits to ones. */
4624 HOST_WIDE_INT lo_index
4625 = tree_low_cst (TREE_PURPOSE (vals
), 0) - domain_min
;
4626 HOST_WIDE_INT hi_index
4627 = tree_low_cst (TREE_VALUE (vals
), 0) - domain_min
;
4629 if (lo_index
< 0 || lo_index
>= bit_size
4630 || hi_index
< 0 || hi_index
>= bit_size
)
4632 for (; lo_index
<= hi_index
; lo_index
++)
4633 buffer
[lo_index
] = 1;
4637 /* Set a single bit to one. */
4639 = tree_low_cst (TREE_VALUE (vals
), 0) - domain_min
;
4640 if (index
< 0 || index
>= bit_size
)
4642 error ("invalid initializer for bit string");
4648 return non_const_bits
;
4651 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
4652 The result is placed in BUFFER (which is an array of bytes).
4653 If the constructor is constant, NULL_TREE is returned.
4654 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
4657 get_set_constructor_bytes (init
, buffer
, wd_size
)
4659 unsigned char *buffer
;
4663 int set_word_size
= BITS_PER_UNIT
;
4664 int bit_size
= wd_size
* set_word_size
;
4666 unsigned char *bytep
= buffer
;
4667 char *bit_buffer
= (char *) alloca (bit_size
);
4668 tree non_const_bits
= get_set_constructor_bits (init
, bit_buffer
, bit_size
);
4670 for (i
= 0; i
< wd_size
; i
++)
4673 for (i
= 0; i
< bit_size
; i
++)
4677 if (BYTES_BIG_ENDIAN
)
4678 *bytep
|= (1 << (set_word_size
- 1 - bit_pos
));
4680 *bytep
|= 1 << bit_pos
;
4683 if (bit_pos
>= set_word_size
)
4684 bit_pos
= 0, bytep
++;
4686 return non_const_bits
;
4689 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
4690 /* Complain that the tree code of NODE does not match the expected CODE.
4691 FILE, LINE, and FUNCTION are of the caller. */
4694 tree_check_failed (node
, code
, file
, line
, function
)
4696 enum tree_code code
;
4699 const char *function
;
4701 internal_error ("tree check: expected %s, have %s in %s, at %s:%d",
4702 tree_code_name
[code
], tree_code_name
[TREE_CODE (node
)],
4703 function
, trim_filename (file
), line
);
4706 /* Similar to above, except that we check for a class of tree
4707 code, given in CL. */
4710 tree_class_check_failed (node
, cl
, file
, line
, function
)
4715 const char *function
;
4718 ("tree check: expected class '%c', have '%c' (%s) in %s, at %s:%d",
4719 cl
, TREE_CODE_CLASS (TREE_CODE (node
)),
4720 tree_code_name
[TREE_CODE (node
)], function
, trim_filename (file
), line
);
4723 #endif /* ENABLE_TREE_CHECKING */
4725 /* For a new vector type node T, build the information necessary for
4726 debuggint output. */
4729 finish_vector_type (t
)
4735 tree index
= build_int_2 (TYPE_VECTOR_SUBPARTS (t
) - 1, 0);
4736 tree array
= build_array_type (TREE_TYPE (t
),
4737 build_index_type (index
));
4738 tree rt
= make_node (RECORD_TYPE
);
4740 TYPE_FIELDS (rt
) = build_decl (FIELD_DECL
, get_identifier ("f"), array
);
4741 DECL_CONTEXT (TYPE_FIELDS (rt
)) = rt
;
4743 TYPE_DEBUG_REPRESENTATION_TYPE (t
) = rt
;
4744 /* In dwarfout.c, type lookup uses TYPE_UID numbers. We want to output
4745 the representation type, and we want to find that die when looking up
4746 the vector type. This is most easily achieved by making the TYPE_UID
4748 TYPE_UID (rt
) = TYPE_UID (t
);
4752 /* Create nodes for all integer types (and error_mark_node) using the sizes
4753 of C datatypes. The caller should call set_sizetype soon after calling
4754 this function to select one of the types as sizetype. */
4757 build_common_tree_nodes (signed_char
)
4760 error_mark_node
= make_node (ERROR_MARK
);
4761 TREE_TYPE (error_mark_node
) = error_mark_node
;
4763 initialize_sizetypes ();
4765 /* Define both `signed char' and `unsigned char'. */
4766 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
4767 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
4769 /* Define `char', which is like either `signed char' or `unsigned char'
4770 but not the same as either. */
4773 ? make_signed_type (CHAR_TYPE_SIZE
)
4774 : make_unsigned_type (CHAR_TYPE_SIZE
));
4776 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
4777 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
4778 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
4779 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
4780 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
4781 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
4782 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
4783 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
4785 intQI_type_node
= make_signed_type (GET_MODE_BITSIZE (QImode
));
4786 intHI_type_node
= make_signed_type (GET_MODE_BITSIZE (HImode
));
4787 intSI_type_node
= make_signed_type (GET_MODE_BITSIZE (SImode
));
4788 intDI_type_node
= make_signed_type (GET_MODE_BITSIZE (DImode
));
4789 intTI_type_node
= make_signed_type (GET_MODE_BITSIZE (TImode
));
4791 unsigned_intQI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (QImode
));
4792 unsigned_intHI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (HImode
));
4793 unsigned_intSI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (SImode
));
4794 unsigned_intDI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (DImode
));
4795 unsigned_intTI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (TImode
));
4798 /* Call this function after calling build_common_tree_nodes and set_sizetype.
4799 It will create several other common tree nodes. */
4802 build_common_tree_nodes_2 (short_double
)
4805 /* Define these next since types below may used them. */
4806 integer_zero_node
= build_int_2 (0, 0);
4807 integer_one_node
= build_int_2 (1, 0);
4808 integer_minus_one_node
= build_int_2 (-1, -1);
4810 size_zero_node
= size_int (0);
4811 size_one_node
= size_int (1);
4812 bitsize_zero_node
= bitsize_int (0);
4813 bitsize_one_node
= bitsize_int (1);
4814 bitsize_unit_node
= bitsize_int (BITS_PER_UNIT
);
4816 void_type_node
= make_node (VOID_TYPE
);
4817 layout_type (void_type_node
);
4819 /* We are not going to have real types in C with less than byte alignment,
4820 so we might as well not have any types that claim to have it. */
4821 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
4822 TYPE_USER_ALIGN (void_type_node
) = 0;
4824 null_pointer_node
= build_int_2 (0, 0);
4825 TREE_TYPE (null_pointer_node
) = build_pointer_type (void_type_node
);
4826 layout_type (TREE_TYPE (null_pointer_node
));
4828 ptr_type_node
= build_pointer_type (void_type_node
);
4830 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
4832 float_type_node
= make_node (REAL_TYPE
);
4833 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
4834 layout_type (float_type_node
);
4836 double_type_node
= make_node (REAL_TYPE
);
4838 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
4840 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
4841 layout_type (double_type_node
);
4843 long_double_type_node
= make_node (REAL_TYPE
);
4844 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
4845 layout_type (long_double_type_node
);
4847 complex_integer_type_node
= make_node (COMPLEX_TYPE
);
4848 TREE_TYPE (complex_integer_type_node
) = integer_type_node
;
4849 layout_type (complex_integer_type_node
);
4851 complex_float_type_node
= make_node (COMPLEX_TYPE
);
4852 TREE_TYPE (complex_float_type_node
) = float_type_node
;
4853 layout_type (complex_float_type_node
);
4855 complex_double_type_node
= make_node (COMPLEX_TYPE
);
4856 TREE_TYPE (complex_double_type_node
) = double_type_node
;
4857 layout_type (complex_double_type_node
);
4859 complex_long_double_type_node
= make_node (COMPLEX_TYPE
);
4860 TREE_TYPE (complex_long_double_type_node
) = long_double_type_node
;
4861 layout_type (complex_long_double_type_node
);
4865 BUILD_VA_LIST_TYPE (t
);
4867 /* Many back-ends define record types without seting TYPE_NAME.
4868 If we copied the record type here, we'd keep the original
4869 record type without a name. This breaks name mangling. So,
4870 don't copy record types and let c_common_nodes_and_builtins()
4871 declare the type to be __builtin_va_list. */
4872 if (TREE_CODE (t
) != RECORD_TYPE
)
4873 t
= build_type_copy (t
);
4875 va_list_type_node
= t
;
4878 unsigned_V4SI_type_node
4879 = make_vector (V4SImode
, unsigned_intSI_type_node
, 1);
4880 unsigned_V2SI_type_node
4881 = make_vector (V2SImode
, unsigned_intSI_type_node
, 1);
4882 unsigned_V4HI_type_node
4883 = make_vector (V4HImode
, unsigned_intHI_type_node
, 1);
4884 unsigned_V8QI_type_node
4885 = make_vector (V8QImode
, unsigned_intQI_type_node
, 1);
4886 unsigned_V8HI_type_node
4887 = make_vector (V8HImode
, unsigned_intHI_type_node
, 1);
4888 unsigned_V16QI_type_node
4889 = make_vector (V16QImode
, unsigned_intQI_type_node
, 1);
4891 V4SF_type_node
= make_vector (V4SFmode
, float_type_node
, 0);
4892 V4SI_type_node
= make_vector (V4SImode
, intSI_type_node
, 0);
4893 V2SI_type_node
= make_vector (V2SImode
, intSI_type_node
, 0);
4894 V4HI_type_node
= make_vector (V4HImode
, intHI_type_node
, 0);
4895 V8QI_type_node
= make_vector (V8QImode
, intQI_type_node
, 0);
4896 V8HI_type_node
= make_vector (V8HImode
, intHI_type_node
, 0);
4897 V2SF_type_node
= make_vector (V2SFmode
, float_type_node
, 0);
4898 V16QI_type_node
= make_vector (V16QImode
, intQI_type_node
, 0);
4901 /* Returns a vector tree node given a vector mode, the inner type, and
4905 make_vector (mode
, innertype
, unsignedp
)
4906 enum machine_mode mode
;
4912 t
= make_node (VECTOR_TYPE
);
4913 TREE_TYPE (t
) = innertype
;
4914 TYPE_MODE (t
) = mode
;
4915 TREE_UNSIGNED (TREE_TYPE (t
)) = unsignedp
;
4916 finish_vector_type (t
);