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 int type_hash_marked_p
PARAMS ((const void *));
166 static void type_hash_mark
PARAMS ((const void *));
167 static int mark_tree_hashtable_entry
PARAMS((void **, void *));
169 /* If non-null, these are language-specific helper functions for
170 unsave_expr_now. If present, LANG_UNSAVE is called before its
171 argument (an UNSAVE_EXPR) is to be unsaved, and all other
172 processing in unsave_expr_now is aborted. LANG_UNSAVE_EXPR_NOW is
173 called from unsave_expr_1 for language-specific tree codes. */
174 void (*lang_unsave
) PARAMS ((tree
*));
175 void (*lang_unsave_expr_now
) PARAMS ((tree
));
177 /* If non-null, these are language-specific helper functions for
178 unsafe_for_reeval. Return negative to not handle some tree. */
179 int (*lang_unsafe_for_reeval
) PARAMS ((tree
));
181 /* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of thing
182 that the assembler should talk about, set DECL_ASSEMBLER_NAME to an
183 appropriate IDENTIFIER_NODE. Otherwise, set it to the
184 ERROR_MARK_NODE to ensure that the assembler does not talk about
186 void (*lang_set_decl_assembler_name
) PARAMS ((tree
));
188 tree global_trees
[TI_MAX
];
189 tree integer_types
[itk_none
];
191 /* Set the DECL_ASSEMBLER_NAME for DECL. */
193 set_decl_assembler_name (decl
)
196 /* The language-independent code should never use the
197 DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and
198 VAR_DECLs for variables with static storage duration need a real
199 DECL_ASSEMBLER_NAME. */
200 if (TREE_CODE (decl
) == FUNCTION_DECL
201 || (TREE_CODE (decl
) == VAR_DECL
202 && (TREE_STATIC (decl
)
203 || DECL_EXTERNAL (decl
)
204 || TREE_PUBLIC (decl
))))
205 /* By default, assume the name to use in assembly code is the
206 same as that used in the source language. (That's correct
207 for C, and GCC used to set DECL_ASSEMBLER_NAME to the same
208 value as DECL_NAME in build_decl, so this choice provides
209 backwards compatibility with existing front-ends. */
210 SET_DECL_ASSEMBLER_NAME (decl
, DECL_NAME (decl
));
212 /* Nobody should ever be asking for the DECL_ASSEMBLER_NAME of
213 these DECLs -- unless they're in language-dependent code, in
214 which case lang_set_decl_assembler_name should handle things. */
218 /* Init the principal obstacks. */
223 gcc_obstack_init (&permanent_obstack
);
225 /* Initialize the hash table of types. */
226 type_hash_table
= htab_create (TYPE_HASH_INITIAL_SIZE
, type_hash_hash
,
228 ggc_add_deletable_htab (type_hash_table
, type_hash_marked_p
,
230 ggc_add_tree_root (global_trees
, TI_MAX
);
231 ggc_add_tree_root (integer_types
, itk_none
);
233 /* Set lang_set_decl_set_assembler_name to a default value. */
234 lang_set_decl_assembler_name
= set_decl_assembler_name
;
238 /* Allocate SIZE bytes in the permanent obstack
239 and return a pointer to them. */
245 return (char *) obstack_alloc (&permanent_obstack
, size
);
248 /* Allocate NELEM items of SIZE bytes in the permanent obstack
249 and return a pointer to them. The storage is cleared before
250 returning the value. */
253 perm_calloc (nelem
, size
)
257 char *rval
= (char *) obstack_alloc (&permanent_obstack
, nelem
* size
);
258 memset (rval
, 0, nelem
* size
);
262 /* Compute the number of bytes occupied by 'node'. This routine only
263 looks at TREE_CODE and, if the code is TREE_VEC, TREE_VEC_LENGTH. */
268 enum tree_code code
= TREE_CODE (node
);
270 switch (TREE_CODE_CLASS (code
))
272 case 'd': /* A decl node */
273 return sizeof (struct tree_decl
);
275 case 't': /* a type node */
276 return sizeof (struct tree_type
);
278 case 'b': /* a lexical block node */
279 return sizeof (struct tree_block
);
281 case 'r': /* a reference */
282 case 'e': /* an expression */
283 case 's': /* an expression with side effects */
284 case '<': /* a comparison expression */
285 case '1': /* a unary arithmetic expression */
286 case '2': /* a binary arithmetic expression */
287 return (sizeof (struct tree_exp
)
288 + (TREE_CODE_LENGTH (code
) - 1) * sizeof (char *));
290 case 'c': /* a constant */
291 /* We can't use TREE_CODE_LENGTH for INTEGER_CST, since the number of
292 words is machine-dependent due to varying length of HOST_WIDE_INT,
293 which might be wider than a pointer (e.g., long long). Similarly
294 for REAL_CST, since the number of words is machine-dependent due
295 to varying size and alignment of `double'. */
296 if (code
== INTEGER_CST
)
297 return sizeof (struct tree_int_cst
);
298 else if (code
== REAL_CST
)
299 return sizeof (struct tree_real_cst
);
301 return (sizeof (struct tree_common
)
302 + TREE_CODE_LENGTH (code
) * sizeof (char *));
304 case 'x': /* something random, like an identifier. */
307 length
= (sizeof (struct tree_common
)
308 + TREE_CODE_LENGTH (code
) * sizeof (char *));
309 if (code
== TREE_VEC
)
310 length
+= (TREE_VEC_LENGTH (node
) - 1) * sizeof (char *);
319 /* Return a newly allocated node of code CODE.
320 For decl and type nodes, some other fields are initialized.
321 The rest of the node is initialized to zero.
323 Achoo! I got a code in the node. */
330 int type
= TREE_CODE_CLASS (code
);
332 #ifdef GATHER_STATISTICS
335 struct tree_common ttmp
;
337 /* We can't allocate a TREE_VEC without knowing how many elements
339 if (code
== TREE_VEC
)
342 TREE_SET_CODE ((tree
)&ttmp
, code
);
343 length
= tree_size ((tree
)&ttmp
);
345 #ifdef GATHER_STATISTICS
348 case 'd': /* A decl node */
352 case 't': /* a type node */
356 case 'b': /* a lexical block */
360 case 's': /* an expression with side effects */
364 case 'r': /* a reference */
368 case 'e': /* an expression */
369 case '<': /* a comparison expression */
370 case '1': /* a unary arithmetic expression */
371 case '2': /* a binary arithmetic expression */
375 case 'c': /* a constant */
379 case 'x': /* something random, like an identifier. */
380 if (code
== IDENTIFIER_NODE
)
382 else if (code
== TREE_VEC
)
392 tree_node_counts
[(int) kind
]++;
393 tree_node_sizes
[(int) kind
] += length
;
396 t
= ggc_alloc_tree (length
);
398 memset ((PTR
) t
, 0, length
);
400 TREE_SET_CODE (t
, code
);
405 TREE_SIDE_EFFECTS (t
) = 1;
406 TREE_TYPE (t
) = void_type_node
;
410 if (code
!= FUNCTION_DECL
)
412 DECL_USER_ALIGN (t
) = 0;
413 DECL_IN_SYSTEM_HEADER (t
) = in_system_header
;
414 DECL_SOURCE_LINE (t
) = lineno
;
415 DECL_SOURCE_FILE (t
) =
416 (input_filename
) ? input_filename
: "<built-in>";
417 DECL_UID (t
) = next_decl_uid
++;
419 /* We have not yet computed the alias set for this declaration. */
420 DECL_POINTER_ALIAS_SET (t
) = -1;
424 TYPE_UID (t
) = next_type_uid
++;
425 TYPE_ALIGN (t
) = char_type_node
? TYPE_ALIGN (char_type_node
) : 0;
426 TYPE_USER_ALIGN (t
) = 0;
427 TYPE_MAIN_VARIANT (t
) = t
;
429 /* Default to no attributes for type, but let target change that. */
430 TYPE_ATTRIBUTES (t
) = NULL_TREE
;
431 (*targetm
.set_default_type_attributes
) (t
);
433 /* We have not yet computed the alias set for this type. */
434 TYPE_ALIAS_SET (t
) = -1;
438 TREE_CONSTANT (t
) = 1;
448 case PREDECREMENT_EXPR
:
449 case PREINCREMENT_EXPR
:
450 case POSTDECREMENT_EXPR
:
451 case POSTINCREMENT_EXPR
:
452 /* All of these have side-effects, no matter what their
454 TREE_SIDE_EFFECTS (t
) = 1;
466 /* A front-end can reset this to an appropriate function if types need
469 tree (*make_lang_type_fn
) PARAMS ((enum tree_code
)) = make_node
;
471 /* Return a new type (with the indicated CODE), doing whatever
472 language-specific processing is required. */
475 make_lang_type (code
)
478 return (*make_lang_type_fn
) (code
);
481 /* Return a new node with the same contents as NODE except that its
482 TREE_CHAIN is zero and it has a fresh uid. */
489 enum tree_code code
= TREE_CODE (node
);
492 length
= tree_size (node
);
493 t
= ggc_alloc_tree (length
);
494 memcpy (t
, node
, length
);
497 TREE_ASM_WRITTEN (t
) = 0;
499 if (TREE_CODE_CLASS (code
) == 'd')
500 DECL_UID (t
) = next_decl_uid
++;
501 else if (TREE_CODE_CLASS (code
) == 't')
503 TYPE_UID (t
) = next_type_uid
++;
504 /* The following is so that the debug code for
505 the copy is different from the original type.
506 The two statements usually duplicate each other
507 (because they clear fields of the same union),
508 but the optimizer should catch that. */
509 TYPE_SYMTAB_POINTER (t
) = 0;
510 TYPE_SYMTAB_ADDRESS (t
) = 0;
516 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
517 For example, this can copy a list made of TREE_LIST nodes. */
529 head
= prev
= copy_node (list
);
530 next
= TREE_CHAIN (list
);
533 TREE_CHAIN (prev
) = copy_node (next
);
534 prev
= TREE_CHAIN (prev
);
535 next
= TREE_CHAIN (next
);
541 /* Return a newly constructed INTEGER_CST node whose constant value
542 is specified by the two ints LOW and HI.
543 The TREE_TYPE is set to `int'.
545 This function should be used via the `build_int_2' macro. */
548 build_int_2_wide (low
, hi
)
549 unsigned HOST_WIDE_INT low
;
552 tree t
= make_node (INTEGER_CST
);
554 TREE_INT_CST_LOW (t
) = low
;
555 TREE_INT_CST_HIGH (t
) = hi
;
556 TREE_TYPE (t
) = integer_type_node
;
560 /* Return a new REAL_CST node whose type is TYPE and value is D. */
570 /* Check for valid float value for this type on this target machine;
571 if not, can print error message and store a valid value in D. */
572 #ifdef CHECK_FLOAT_VALUE
573 CHECK_FLOAT_VALUE (TYPE_MODE (type
), d
, overflow
);
576 v
= make_node (REAL_CST
);
577 TREE_TYPE (v
) = type
;
578 TREE_REAL_CST (v
) = d
;
579 TREE_OVERFLOW (v
) = TREE_CONSTANT_OVERFLOW (v
) = overflow
;
583 /* Return a new REAL_CST node whose type is TYPE
584 and whose value is the integer value of the INTEGER_CST node I. */
586 #if !defined (REAL_IS_NOT_DOUBLE) || defined (REAL_ARITHMETIC)
589 real_value_from_int_cst (type
, i
)
590 tree type ATTRIBUTE_UNUSED
, i
;
594 #ifdef REAL_ARITHMETIC
595 /* Clear all bits of the real value type so that we can later do
596 bitwise comparisons to see if two values are the same. */
597 memset ((char *) &d
, 0, sizeof d
);
599 if (! TREE_UNSIGNED (TREE_TYPE (i
)))
600 REAL_VALUE_FROM_INT (d
, TREE_INT_CST_LOW (i
), TREE_INT_CST_HIGH (i
),
603 REAL_VALUE_FROM_UNSIGNED_INT (d
, TREE_INT_CST_LOW (i
),
604 TREE_INT_CST_HIGH (i
), TYPE_MODE (type
));
605 #else /* not REAL_ARITHMETIC */
606 /* Some 386 compilers mishandle unsigned int to float conversions,
607 so introduce a temporary variable E to avoid those bugs. */
608 if (TREE_INT_CST_HIGH (i
) < 0 && ! TREE_UNSIGNED (TREE_TYPE (i
)))
612 d
= (double) (~TREE_INT_CST_HIGH (i
));
613 e
= ((double) ((HOST_WIDE_INT
) 1 << (HOST_BITS_PER_WIDE_INT
/ 2))
614 * (double) ((HOST_WIDE_INT
) 1 << (HOST_BITS_PER_WIDE_INT
/ 2)));
616 e
= (double) (~TREE_INT_CST_LOW (i
));
624 d
= (double) (unsigned HOST_WIDE_INT
) TREE_INT_CST_HIGH (i
);
625 e
= ((double) ((HOST_WIDE_INT
) 1 << (HOST_BITS_PER_WIDE_INT
/ 2))
626 * (double) ((HOST_WIDE_INT
) 1 << (HOST_BITS_PER_WIDE_INT
/ 2)));
628 e
= (double) TREE_INT_CST_LOW (i
);
631 #endif /* not REAL_ARITHMETIC */
635 /* Args to pass to and from build_real_from_int_cst_1. */
639 tree type
; /* Input: type to conver to. */
640 tree i
; /* Input: operand to convert. */
641 REAL_VALUE_TYPE d
; /* Output: floating point value. */
644 /* Convert an integer to a floating point value while protected by a floating
645 point exception handler. */
648 build_real_from_int_cst_1 (data
)
651 struct brfic_args
*args
= (struct brfic_args
*) data
;
653 #ifdef REAL_ARITHMETIC
654 args
->d
= real_value_from_int_cst (args
->type
, args
->i
);
657 = REAL_VALUE_TRUNCATE (TYPE_MODE (args
->type
),
658 real_value_from_int_cst (args
->type
, args
->i
));
662 /* Given a tree representing an integer constant I, return a tree
663 representing the same value as a floating-point constant of type TYPE.
664 We cannot perform this operation if there is no way of doing arithmetic
665 on floating-point values. */
668 build_real_from_int_cst (type
, i
)
673 int overflow
= TREE_OVERFLOW (i
);
675 struct brfic_args args
;
677 v
= make_node (REAL_CST
);
678 TREE_TYPE (v
) = type
;
680 /* Setup input for build_real_from_int_cst_1() */
684 if (do_float_handler (build_real_from_int_cst_1
, (PTR
) &args
))
685 /* Receive output from build_real_from_int_cst_1() */
689 /* We got an exception from build_real_from_int_cst_1() */
694 /* Check for valid float value for this type on this target machine. */
696 #ifdef CHECK_FLOAT_VALUE
697 CHECK_FLOAT_VALUE (TYPE_MODE (type
), d
, overflow
);
700 TREE_REAL_CST (v
) = d
;
701 TREE_OVERFLOW (v
) = TREE_CONSTANT_OVERFLOW (v
) = overflow
;
705 #endif /* not REAL_IS_NOT_DOUBLE, or REAL_ARITHMETIC */
707 /* Return a newly constructed STRING_CST node whose value is
708 the LEN characters at STR.
709 The TREE_TYPE is not initialized. */
712 build_string (len
, str
)
716 tree s
= make_node (STRING_CST
);
718 TREE_STRING_LENGTH (s
) = len
;
719 TREE_STRING_POINTER (s
) = ggc_alloc_string (str
, len
);
724 /* Return a newly constructed COMPLEX_CST node whose value is
725 specified by the real and imaginary parts REAL and IMAG.
726 Both REAL and IMAG should be constant nodes. TYPE, if specified,
727 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
730 build_complex (type
, real
, imag
)
734 tree t
= make_node (COMPLEX_CST
);
736 TREE_REALPART (t
) = real
;
737 TREE_IMAGPART (t
) = imag
;
738 TREE_TYPE (t
) = type
? type
: build_complex_type (TREE_TYPE (real
));
739 TREE_OVERFLOW (t
) = TREE_OVERFLOW (real
) | TREE_OVERFLOW (imag
);
740 TREE_CONSTANT_OVERFLOW (t
)
741 = TREE_CONSTANT_OVERFLOW (real
) | TREE_CONSTANT_OVERFLOW (imag
);
745 /* Build a newly constructed TREE_VEC node of length LEN. */
752 int length
= (len
-1) * sizeof (tree
) + sizeof (struct tree_vec
);
754 #ifdef GATHER_STATISTICS
755 tree_node_counts
[(int)vec_kind
]++;
756 tree_node_sizes
[(int)vec_kind
] += length
;
759 t
= ggc_alloc_tree (length
);
761 memset ((PTR
) t
, 0, length
);
762 TREE_SET_CODE (t
, TREE_VEC
);
763 TREE_VEC_LENGTH (t
) = len
;
768 /* Return 1 if EXPR is the integer constant zero or a complex constant
777 return ((TREE_CODE (expr
) == INTEGER_CST
778 && ! TREE_CONSTANT_OVERFLOW (expr
)
779 && TREE_INT_CST_LOW (expr
) == 0
780 && TREE_INT_CST_HIGH (expr
) == 0)
781 || (TREE_CODE (expr
) == COMPLEX_CST
782 && integer_zerop (TREE_REALPART (expr
))
783 && integer_zerop (TREE_IMAGPART (expr
))));
786 /* Return 1 if EXPR is the integer constant one or the corresponding
795 return ((TREE_CODE (expr
) == INTEGER_CST
796 && ! TREE_CONSTANT_OVERFLOW (expr
)
797 && TREE_INT_CST_LOW (expr
) == 1
798 && TREE_INT_CST_HIGH (expr
) == 0)
799 || (TREE_CODE (expr
) == COMPLEX_CST
800 && integer_onep (TREE_REALPART (expr
))
801 && integer_zerop (TREE_IMAGPART (expr
))));
804 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
805 it contains. Likewise for the corresponding complex constant. */
808 integer_all_onesp (expr
)
816 if (TREE_CODE (expr
) == COMPLEX_CST
817 && integer_all_onesp (TREE_REALPART (expr
))
818 && integer_zerop (TREE_IMAGPART (expr
)))
821 else if (TREE_CODE (expr
) != INTEGER_CST
822 || TREE_CONSTANT_OVERFLOW (expr
))
825 uns
= TREE_UNSIGNED (TREE_TYPE (expr
));
827 return (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
828 && TREE_INT_CST_HIGH (expr
) == -1);
830 /* Note that using TYPE_PRECISION here is wrong. We care about the
831 actual bits, not the (arbitrary) range of the type. */
832 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr
)));
833 if (prec
>= HOST_BITS_PER_WIDE_INT
)
835 HOST_WIDE_INT high_value
;
838 shift_amount
= prec
- HOST_BITS_PER_WIDE_INT
;
840 if (shift_amount
> HOST_BITS_PER_WIDE_INT
)
841 /* Can not handle precisions greater than twice the host int size. */
843 else if (shift_amount
== HOST_BITS_PER_WIDE_INT
)
844 /* Shifting by the host word size is undefined according to the ANSI
845 standard, so we must handle this as a special case. */
848 high_value
= ((HOST_WIDE_INT
) 1 << shift_amount
) - 1;
850 return (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
851 && TREE_INT_CST_HIGH (expr
) == high_value
);
854 return TREE_INT_CST_LOW (expr
) == ((unsigned HOST_WIDE_INT
) 1 << prec
) - 1;
857 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
865 HOST_WIDE_INT high
, low
;
869 if (TREE_CODE (expr
) == COMPLEX_CST
870 && integer_pow2p (TREE_REALPART (expr
))
871 && integer_zerop (TREE_IMAGPART (expr
)))
874 if (TREE_CODE (expr
) != INTEGER_CST
|| TREE_CONSTANT_OVERFLOW (expr
))
877 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
878 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
879 high
= TREE_INT_CST_HIGH (expr
);
880 low
= TREE_INT_CST_LOW (expr
);
882 /* First clear all bits that are beyond the type's precision in case
883 we've been sign extended. */
885 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
887 else if (prec
> HOST_BITS_PER_WIDE_INT
)
888 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
892 if (prec
< HOST_BITS_PER_WIDE_INT
)
893 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
896 if (high
== 0 && low
== 0)
899 return ((high
== 0 && (low
& (low
- 1)) == 0)
900 || (low
== 0 && (high
& (high
- 1)) == 0));
903 /* Return the power of two represented by a tree node known to be a
911 HOST_WIDE_INT high
, low
;
915 if (TREE_CODE (expr
) == COMPLEX_CST
)
916 return tree_log2 (TREE_REALPART (expr
));
918 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
919 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
921 high
= TREE_INT_CST_HIGH (expr
);
922 low
= TREE_INT_CST_LOW (expr
);
924 /* First clear all bits that are beyond the type's precision in case
925 we've been sign extended. */
927 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
929 else if (prec
> HOST_BITS_PER_WIDE_INT
)
930 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
934 if (prec
< HOST_BITS_PER_WIDE_INT
)
935 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
938 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ exact_log2 (high
)
942 /* Similar, but return the largest integer Y such that 2 ** Y is less
943 than or equal to EXPR. */
946 tree_floor_log2 (expr
)
950 HOST_WIDE_INT high
, low
;
954 if (TREE_CODE (expr
) == COMPLEX_CST
)
955 return tree_log2 (TREE_REALPART (expr
));
957 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
958 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
960 high
= TREE_INT_CST_HIGH (expr
);
961 low
= TREE_INT_CST_LOW (expr
);
963 /* First clear all bits that are beyond the type's precision in case
964 we've been sign extended. Ignore if type's precision hasn't been set
965 since what we are doing is setting it. */
967 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
|| prec
== 0)
969 else if (prec
> HOST_BITS_PER_WIDE_INT
)
970 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
974 if (prec
< HOST_BITS_PER_WIDE_INT
)
975 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
978 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ floor_log2 (high
)
982 /* Return 1 if EXPR is the real constant zero. */
990 return ((TREE_CODE (expr
) == REAL_CST
991 && ! TREE_CONSTANT_OVERFLOW (expr
)
992 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst0
))
993 || (TREE_CODE (expr
) == COMPLEX_CST
994 && real_zerop (TREE_REALPART (expr
))
995 && real_zerop (TREE_IMAGPART (expr
))));
998 /* Return 1 if EXPR is the real constant one in real or complex form. */
1006 return ((TREE_CODE (expr
) == REAL_CST
1007 && ! TREE_CONSTANT_OVERFLOW (expr
)
1008 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst1
))
1009 || (TREE_CODE (expr
) == COMPLEX_CST
1010 && real_onep (TREE_REALPART (expr
))
1011 && real_zerop (TREE_IMAGPART (expr
))));
1014 /* Return 1 if EXPR is the real constant two. */
1022 return ((TREE_CODE (expr
) == REAL_CST
1023 && ! TREE_CONSTANT_OVERFLOW (expr
)
1024 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst2
))
1025 || (TREE_CODE (expr
) == COMPLEX_CST
1026 && real_twop (TREE_REALPART (expr
))
1027 && real_zerop (TREE_IMAGPART (expr
))));
1030 /* Nonzero if EXP is a constant or a cast of a constant. */
1033 really_constant_p (exp
)
1036 /* This is not quite the same as STRIP_NOPS. It does more. */
1037 while (TREE_CODE (exp
) == NOP_EXPR
1038 || TREE_CODE (exp
) == CONVERT_EXPR
1039 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
1040 exp
= TREE_OPERAND (exp
, 0);
1041 return TREE_CONSTANT (exp
);
1044 /* Return first list element whose TREE_VALUE is ELEM.
1045 Return 0 if ELEM is not in LIST. */
1048 value_member (elem
, list
)
1053 if (elem
== TREE_VALUE (list
))
1055 list
= TREE_CHAIN (list
);
1060 /* Return first list element whose TREE_PURPOSE is ELEM.
1061 Return 0 if ELEM is not in LIST. */
1064 purpose_member (elem
, list
)
1069 if (elem
== TREE_PURPOSE (list
))
1071 list
= TREE_CHAIN (list
);
1076 /* Return first list element whose BINFO_TYPE is ELEM.
1077 Return 0 if ELEM is not in LIST. */
1080 binfo_member (elem
, list
)
1085 if (elem
== BINFO_TYPE (list
))
1087 list
= TREE_CHAIN (list
);
1092 /* Return nonzero if ELEM is part of the chain CHAIN. */
1095 chain_member (elem
, chain
)
1102 chain
= TREE_CHAIN (chain
);
1108 /* Return nonzero if ELEM is equal to TREE_VALUE (CHAIN) for any piece of
1109 chain CHAIN. This and the next function are currently unused, but
1110 are retained for completeness. */
1113 chain_member_value (elem
, chain
)
1118 if (elem
== TREE_VALUE (chain
))
1120 chain
= TREE_CHAIN (chain
);
1126 /* Return nonzero if ELEM is equal to TREE_PURPOSE (CHAIN)
1127 for any piece of chain CHAIN. */
1130 chain_member_purpose (elem
, chain
)
1135 if (elem
== TREE_PURPOSE (chain
))
1137 chain
= TREE_CHAIN (chain
);
1143 /* Return the length of a chain of nodes chained through TREE_CHAIN.
1144 We expect a null pointer to mark the end of the chain.
1145 This is the Lisp primitive `length'. */
1154 for (tail
= t
; tail
; tail
= TREE_CHAIN (tail
))
1160 /* Returns the number of FIELD_DECLs in TYPE. */
1163 fields_length (type
)
1166 tree t
= TYPE_FIELDS (type
);
1169 for (; t
; t
= TREE_CHAIN (t
))
1170 if (TREE_CODE (t
) == FIELD_DECL
)
1176 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
1177 by modifying the last node in chain 1 to point to chain 2.
1178 This is the Lisp primitive `nconc'. */
1188 #ifdef ENABLE_TREE_CHECKING
1192 for (t1
= op1
; TREE_CHAIN (t1
); t1
= TREE_CHAIN (t1
))
1194 TREE_CHAIN (t1
) = op2
;
1195 #ifdef ENABLE_TREE_CHECKING
1196 for (t2
= op2
; t2
; t2
= TREE_CHAIN (t2
))
1198 abort (); /* Circularity created. */
1206 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
1214 while ((next
= TREE_CHAIN (chain
)))
1219 /* Reverse the order of elements in the chain T,
1220 and return the new head of the chain (old last element). */
1226 tree prev
= 0, decl
, next
;
1227 for (decl
= t
; decl
; decl
= next
)
1229 next
= TREE_CHAIN (decl
);
1230 TREE_CHAIN (decl
) = prev
;
1236 /* Given a chain CHAIN of tree nodes,
1237 construct and return a list of those nodes. */
1243 tree result
= NULL_TREE
;
1244 tree in_tail
= chain
;
1245 tree out_tail
= NULL_TREE
;
1249 tree next
= tree_cons (NULL_TREE
, in_tail
, NULL_TREE
);
1251 TREE_CHAIN (out_tail
) = next
;
1255 in_tail
= TREE_CHAIN (in_tail
);
1261 /* Return a newly created TREE_LIST node whose
1262 purpose and value fields are PARM and VALUE. */
1265 build_tree_list (parm
, value
)
1268 tree t
= make_node (TREE_LIST
);
1269 TREE_PURPOSE (t
) = parm
;
1270 TREE_VALUE (t
) = value
;
1274 /* Return a newly created TREE_LIST node whose
1275 purpose and value fields are PARM and VALUE
1276 and whose TREE_CHAIN is CHAIN. */
1279 tree_cons (purpose
, value
, chain
)
1280 tree purpose
, value
, chain
;
1284 node
= ggc_alloc_tree (sizeof (struct tree_list
));
1286 memset (node
, 0, sizeof (struct tree_common
));
1288 #ifdef GATHER_STATISTICS
1289 tree_node_counts
[(int) x_kind
]++;
1290 tree_node_sizes
[(int) x_kind
] += sizeof (struct tree_list
);
1293 TREE_SET_CODE (node
, TREE_LIST
);
1294 TREE_CHAIN (node
) = chain
;
1295 TREE_PURPOSE (node
) = purpose
;
1296 TREE_VALUE (node
) = value
;
1301 /* Return the size nominally occupied by an object of type TYPE
1302 when it resides in memory. The value is measured in units of bytes,
1303 and its data type is that normally used for type sizes
1304 (which is the first type created by make_signed_type or
1305 make_unsigned_type). */
1308 size_in_bytes (type
)
1313 if (type
== error_mark_node
)
1314 return integer_zero_node
;
1316 type
= TYPE_MAIN_VARIANT (type
);
1317 t
= TYPE_SIZE_UNIT (type
);
1321 incomplete_type_error (NULL_TREE
, type
);
1322 return size_zero_node
;
1325 if (TREE_CODE (t
) == INTEGER_CST
)
1326 force_fit_type (t
, 0);
1331 /* Return the size of TYPE (in bytes) as a wide integer
1332 or return -1 if the size can vary or is larger than an integer. */
1335 int_size_in_bytes (type
)
1340 if (type
== error_mark_node
)
1343 type
= TYPE_MAIN_VARIANT (type
);
1344 t
= TYPE_SIZE_UNIT (type
);
1346 || TREE_CODE (t
) != INTEGER_CST
1347 || TREE_OVERFLOW (t
)
1348 || TREE_INT_CST_HIGH (t
) != 0
1349 /* If the result would appear negative, it's too big to represent. */
1350 || (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0)
1353 return TREE_INT_CST_LOW (t
);
1356 /* Return the bit position of FIELD, in bits from the start of the record.
1357 This is a tree of type bitsizetype. */
1360 bit_position (field
)
1364 return bit_from_pos (DECL_FIELD_OFFSET (field
),
1365 DECL_FIELD_BIT_OFFSET (field
));
1368 /* Likewise, but return as an integer. Abort if it cannot be represented
1369 in that way (since it could be a signed value, we don't have the option
1370 of returning -1 like int_size_in_byte can. */
1373 int_bit_position (field
)
1376 return tree_low_cst (bit_position (field
), 0);
1379 /* Return the byte position of FIELD, in bytes from the start of the record.
1380 This is a tree of type sizetype. */
1383 byte_position (field
)
1386 return byte_from_pos (DECL_FIELD_OFFSET (field
),
1387 DECL_FIELD_BIT_OFFSET (field
));
1390 /* Likewise, but return as an integer. Abort if it cannot be represented
1391 in that way (since it could be a signed value, we don't have the option
1392 of returning -1 like int_size_in_byte can. */
1395 int_byte_position (field
)
1398 return tree_low_cst (byte_position (field
), 0);
1401 /* Return the strictest alignment, in bits, that T is known to have. */
1407 unsigned int align0
, align1
;
1409 switch (TREE_CODE (t
))
1411 case NOP_EXPR
: case CONVERT_EXPR
: case NON_LVALUE_EXPR
:
1412 /* If we have conversions, we know that the alignment of the
1413 object must meet each of the alignments of the types. */
1414 align0
= expr_align (TREE_OPERAND (t
, 0));
1415 align1
= TYPE_ALIGN (TREE_TYPE (t
));
1416 return MAX (align0
, align1
);
1418 case SAVE_EXPR
: case COMPOUND_EXPR
: case MODIFY_EXPR
:
1419 case INIT_EXPR
: case TARGET_EXPR
: case WITH_CLEANUP_EXPR
:
1420 case WITH_RECORD_EXPR
: case CLEANUP_POINT_EXPR
: case UNSAVE_EXPR
:
1421 /* These don't change the alignment of an object. */
1422 return expr_align (TREE_OPERAND (t
, 0));
1425 /* The best we can do is say that the alignment is the least aligned
1427 align0
= expr_align (TREE_OPERAND (t
, 1));
1428 align1
= expr_align (TREE_OPERAND (t
, 2));
1429 return MIN (align0
, align1
);
1431 case LABEL_DECL
: case CONST_DECL
:
1432 case VAR_DECL
: case PARM_DECL
: case RESULT_DECL
:
1433 if (DECL_ALIGN (t
) != 0)
1434 return DECL_ALIGN (t
);
1438 return FUNCTION_BOUNDARY
;
1444 /* Otherwise take the alignment from that of the type. */
1445 return TYPE_ALIGN (TREE_TYPE (t
));
1448 /* Return, as a tree node, the number of elements for TYPE (which is an
1449 ARRAY_TYPE) minus one. This counts only elements of the top array. */
1452 array_type_nelts (type
)
1455 tree index_type
, min
, max
;
1457 /* If they did it with unspecified bounds, then we should have already
1458 given an error about it before we got here. */
1459 if (! TYPE_DOMAIN (type
))
1460 return error_mark_node
;
1462 index_type
= TYPE_DOMAIN (type
);
1463 min
= TYPE_MIN_VALUE (index_type
);
1464 max
= TYPE_MAX_VALUE (index_type
);
1466 return (integer_zerop (min
)
1468 : fold (build (MINUS_EXPR
, TREE_TYPE (max
), max
, min
)));
1471 /* Return nonzero if arg is static -- a reference to an object in
1472 static storage. This is not the same as the C meaning of `static'. */
1478 switch (TREE_CODE (arg
))
1481 /* Nested functions aren't static, since taking their address
1482 involves a trampoline. */
1483 return (decl_function_context (arg
) == 0 || DECL_NO_STATIC_CHAIN (arg
))
1484 && ! DECL_NON_ADDR_CONST_P (arg
);
1487 return (TREE_STATIC (arg
) || DECL_EXTERNAL (arg
))
1488 && ! DECL_NON_ADDR_CONST_P (arg
);
1491 return TREE_STATIC (arg
);
1497 /* If we are referencing a bitfield, we can't evaluate an
1498 ADDR_EXPR at compile time and so it isn't a constant. */
1500 return (! DECL_BIT_FIELD (TREE_OPERAND (arg
, 1))
1501 && staticp (TREE_OPERAND (arg
, 0)));
1507 /* This case is technically correct, but results in setting
1508 TREE_CONSTANT on ADDR_EXPRs that cannot be evaluated at
1511 return TREE_CONSTANT (TREE_OPERAND (arg
, 0));
1515 case ARRAY_RANGE_REF
:
1516 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg
))) == INTEGER_CST
1517 && TREE_CODE (TREE_OPERAND (arg
, 1)) == INTEGER_CST
)
1518 return staticp (TREE_OPERAND (arg
, 0));
1525 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
1526 Do this to any expression which may be used in more than one place,
1527 but must be evaluated only once.
1529 Normally, expand_expr would reevaluate the expression each time.
1530 Calling save_expr produces something that is evaluated and recorded
1531 the first time expand_expr is called on it. Subsequent calls to
1532 expand_expr just reuse the recorded value.
1534 The call to expand_expr that generates code that actually computes
1535 the value is the first call *at compile time*. Subsequent calls
1536 *at compile time* generate code to use the saved value.
1537 This produces correct result provided that *at run time* control
1538 always flows through the insns made by the first expand_expr
1539 before reaching the other places where the save_expr was evaluated.
1540 You, the caller of save_expr, must make sure this is so.
1542 Constants, and certain read-only nodes, are returned with no
1543 SAVE_EXPR because that is safe. Expressions containing placeholders
1544 are not touched; see tree.def for an explanation of what these
1551 tree t
= fold (expr
);
1553 /* We don't care about whether this can be used as an lvalue in this
1555 while (TREE_CODE (t
) == NON_LVALUE_EXPR
)
1556 t
= TREE_OPERAND (t
, 0);
1558 /* If the tree evaluates to a constant, then we don't want to hide that
1559 fact (i.e. this allows further folding, and direct checks for constants).
1560 However, a read-only object that has side effects cannot be bypassed.
1561 Since it is no problem to reevaluate literals, we just return the
1564 if (TREE_CONSTANT (t
) || (TREE_READONLY (t
) && ! TREE_SIDE_EFFECTS (t
))
1565 || TREE_CODE (t
) == SAVE_EXPR
|| TREE_CODE (t
) == ERROR_MARK
)
1568 /* If T contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
1569 it means that the size or offset of some field of an object depends on
1570 the value within another field.
1572 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
1573 and some variable since it would then need to be both evaluated once and
1574 evaluated more than once. Front-ends must assure this case cannot
1575 happen by surrounding any such subexpressions in their own SAVE_EXPR
1576 and forcing evaluation at the proper time. */
1577 if (contains_placeholder_p (t
))
1580 t
= build (SAVE_EXPR
, TREE_TYPE (expr
), t
, current_function_decl
, NULL_TREE
);
1582 /* This expression might be placed ahead of a jump to ensure that the
1583 value was computed on both sides of the jump. So make sure it isn't
1584 eliminated as dead. */
1585 TREE_SIDE_EFFECTS (t
) = 1;
1586 TREE_READONLY (t
) = 1;
1590 /* Arrange for an expression to be expanded multiple independent
1591 times. This is useful for cleanup actions, as the backend can
1592 expand them multiple times in different places. */
1600 /* If this is already protected, no sense in protecting it again. */
1601 if (TREE_CODE (expr
) == UNSAVE_EXPR
)
1604 t
= build1 (UNSAVE_EXPR
, TREE_TYPE (expr
), expr
);
1605 TREE_SIDE_EFFECTS (t
) = TREE_SIDE_EFFECTS (expr
);
1609 /* Returns the index of the first non-tree operand for CODE, or the number
1610 of operands if all are trees. */
1614 enum tree_code code
;
1620 case GOTO_SUBROUTINE_EXPR
:
1623 case WITH_CLEANUP_EXPR
:
1625 case METHOD_CALL_EXPR
:
1628 return TREE_CODE_LENGTH (code
);
1632 /* Perform any modifications to EXPR required when it is unsaved. Does
1633 not recurse into EXPR's subtrees. */
1636 unsave_expr_1 (expr
)
1639 switch (TREE_CODE (expr
))
1642 if (! SAVE_EXPR_PERSISTENT_P (expr
))
1643 SAVE_EXPR_RTL (expr
) = 0;
1647 /* Don't mess with a TARGET_EXPR that hasn't been expanded.
1648 It's OK for this to happen if it was part of a subtree that
1649 isn't immediately expanded, such as operand 2 of another
1651 if (TREE_OPERAND (expr
, 1))
1654 TREE_OPERAND (expr
, 1) = TREE_OPERAND (expr
, 3);
1655 TREE_OPERAND (expr
, 3) = NULL_TREE
;
1659 /* I don't yet know how to emit a sequence multiple times. */
1660 if (RTL_EXPR_SEQUENCE (expr
) != 0)
1665 if (lang_unsave_expr_now
!= 0)
1666 (*lang_unsave_expr_now
) (expr
);
1671 /* Helper function for unsave_expr_now. */
1674 unsave_expr_now_r (expr
)
1677 enum tree_code code
;
1679 /* There's nothing to do for NULL_TREE. */
1683 unsave_expr_1 (expr
);
1685 code
= TREE_CODE (expr
);
1686 switch (TREE_CODE_CLASS (code
))
1688 case 'c': /* a constant */
1689 case 't': /* a type node */
1690 case 'd': /* A decl node */
1691 case 'b': /* A block node */
1694 case 'x': /* miscellaneous: e.g., identifier, TREE_LIST or ERROR_MARK. */
1695 if (code
== TREE_LIST
)
1697 unsave_expr_now_r (TREE_VALUE (expr
));
1698 unsave_expr_now_r (TREE_CHAIN (expr
));
1702 case 'e': /* an expression */
1703 case 'r': /* a reference */
1704 case 's': /* an expression with side effects */
1705 case '<': /* a comparison expression */
1706 case '2': /* a binary arithmetic expression */
1707 case '1': /* a unary arithmetic expression */
1711 for (i
= first_rtl_op (code
) - 1; i
>= 0; i
--)
1712 unsave_expr_now_r (TREE_OPERAND (expr
, i
));
1721 /* Modify a tree in place so that all the evaluate only once things
1722 are cleared out. Return the EXPR given. */
1725 unsave_expr_now (expr
)
1728 if (lang_unsave
!= 0)
1729 (*lang_unsave
) (&expr
);
1731 unsave_expr_now_r (expr
);
1736 /* Return 0 if it is safe to evaluate EXPR multiple times,
1737 return 1 if it is safe if EXPR is unsaved afterward, or
1738 return 2 if it is completely unsafe.
1740 This assumes that CALL_EXPRs and TARGET_EXPRs are never replicated in
1741 an expression tree, so that it safe to unsave them and the surrounding
1742 context will be correct.
1744 SAVE_EXPRs basically *only* appear replicated in an expression tree,
1745 occasionally across the whole of a function. It is therefore only
1746 safe to unsave a SAVE_EXPR if you know that all occurrences appear
1747 below the UNSAVE_EXPR.
1749 RTL_EXPRs consume their rtl during evaluation. It is therefore
1750 never possible to unsave them. */
1753 unsafe_for_reeval (expr
)
1757 enum tree_code code
;
1762 if (expr
== NULL_TREE
)
1765 code
= TREE_CODE (expr
);
1766 first_rtl
= first_rtl_op (code
);
1775 for (exp
= expr
; exp
!= 0; exp
= TREE_CHAIN (exp
))
1777 tmp
= unsafe_for_reeval (TREE_VALUE (exp
));
1778 unsafeness
= MAX (tmp
, unsafeness
);
1784 tmp
= unsafe_for_reeval (TREE_OPERAND (expr
, 1));
1785 return MAX (tmp
, 1);
1792 if (lang_unsafe_for_reeval
!= 0)
1794 tmp
= (*lang_unsafe_for_reeval
) (expr
);
1801 switch (TREE_CODE_CLASS (code
))
1803 case 'c': /* a constant */
1804 case 't': /* a type node */
1805 case 'x': /* something random, like an identifier or an ERROR_MARK. */
1806 case 'd': /* A decl node */
1807 case 'b': /* A block node */
1810 case 'e': /* an expression */
1811 case 'r': /* a reference */
1812 case 's': /* an expression with side effects */
1813 case '<': /* a comparison expression */
1814 case '2': /* a binary arithmetic expression */
1815 case '1': /* a unary arithmetic expression */
1816 for (i
= first_rtl
- 1; i
>= 0; i
--)
1818 tmp
= unsafe_for_reeval (TREE_OPERAND (expr
, i
));
1819 unsafeness
= MAX (tmp
, unsafeness
);
1829 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
1830 or offset that depends on a field within a record. */
1833 contains_placeholder_p (exp
)
1836 enum tree_code code
;
1842 /* If we have a WITH_RECORD_EXPR, it "cancels" any PLACEHOLDER_EXPR
1843 in it since it is supplying a value for it. */
1844 code
= TREE_CODE (exp
);
1845 if (code
== WITH_RECORD_EXPR
)
1847 else if (code
== PLACEHOLDER_EXPR
)
1850 switch (TREE_CODE_CLASS (code
))
1853 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
1854 position computations since they will be converted into a
1855 WITH_RECORD_EXPR involving the reference, which will assume
1856 here will be valid. */
1857 return contains_placeholder_p (TREE_OPERAND (exp
, 0));
1860 if (code
== TREE_LIST
)
1861 return (contains_placeholder_p (TREE_VALUE (exp
))
1862 || (TREE_CHAIN (exp
) != 0
1863 && contains_placeholder_p (TREE_CHAIN (exp
))));
1872 /* Ignoring the first operand isn't quite right, but works best. */
1873 return contains_placeholder_p (TREE_OPERAND (exp
, 1));
1880 return (contains_placeholder_p (TREE_OPERAND (exp
, 0))
1881 || contains_placeholder_p (TREE_OPERAND (exp
, 1))
1882 || contains_placeholder_p (TREE_OPERAND (exp
, 2)));
1885 /* If we already know this doesn't have a placeholder, don't
1887 if (SAVE_EXPR_NOPLACEHOLDER (exp
) || SAVE_EXPR_RTL (exp
) != 0)
1890 SAVE_EXPR_NOPLACEHOLDER (exp
) = 1;
1891 result
= contains_placeholder_p (TREE_OPERAND (exp
, 0));
1893 SAVE_EXPR_NOPLACEHOLDER (exp
) = 0;
1898 return (TREE_OPERAND (exp
, 1) != 0
1899 && contains_placeholder_p (TREE_OPERAND (exp
, 1)));
1905 switch (TREE_CODE_LENGTH (code
))
1908 return contains_placeholder_p (TREE_OPERAND (exp
, 0));
1910 return (contains_placeholder_p (TREE_OPERAND (exp
, 0))
1911 || contains_placeholder_p (TREE_OPERAND (exp
, 1)));
1922 /* Return 1 if EXP contains any expressions that produce cleanups for an
1923 outer scope to deal with. Used by fold. */
1931 if (! TREE_SIDE_EFFECTS (exp
))
1934 switch (TREE_CODE (exp
))
1937 case GOTO_SUBROUTINE_EXPR
:
1938 case WITH_CLEANUP_EXPR
:
1941 case CLEANUP_POINT_EXPR
:
1945 for (exp
= TREE_OPERAND (exp
, 1); exp
; exp
= TREE_CHAIN (exp
))
1947 cmp
= has_cleanups (TREE_VALUE (exp
));
1957 /* This general rule works for most tree codes. All exceptions should be
1958 handled above. If this is a language-specific tree code, we can't
1959 trust what might be in the operand, so say we don't know
1961 if ((int) TREE_CODE (exp
) >= (int) LAST_AND_UNUSED_TREE_CODE
)
1964 nops
= first_rtl_op (TREE_CODE (exp
));
1965 for (i
= 0; i
< nops
; i
++)
1966 if (TREE_OPERAND (exp
, i
) != 0)
1968 int type
= TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp
, i
)));
1969 if (type
== 'e' || type
== '<' || type
== '1' || type
== '2'
1970 || type
== 'r' || type
== 's')
1972 cmp
= has_cleanups (TREE_OPERAND (exp
, i
));
1981 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
1982 return a tree with all occurrences of references to F in a
1983 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
1984 contains only arithmetic expressions or a CALL_EXPR with a
1985 PLACEHOLDER_EXPR occurring only in its arglist. */
1988 substitute_in_expr (exp
, f
, r
)
1993 enum tree_code code
= TREE_CODE (exp
);
1998 switch (TREE_CODE_CLASS (code
))
2005 if (code
== PLACEHOLDER_EXPR
)
2007 else if (code
== TREE_LIST
)
2009 op0
= (TREE_CHAIN (exp
) == 0
2010 ? 0 : substitute_in_expr (TREE_CHAIN (exp
), f
, r
));
2011 op1
= substitute_in_expr (TREE_VALUE (exp
), f
, r
);
2012 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
2015 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
2024 switch (TREE_CODE_LENGTH (code
))
2027 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2028 if (op0
== TREE_OPERAND (exp
, 0))
2031 if (code
== NON_LVALUE_EXPR
)
2034 new = fold (build1 (code
, TREE_TYPE (exp
), op0
));
2038 /* An RTL_EXPR cannot contain a PLACEHOLDER_EXPR; a CONSTRUCTOR
2039 could, but we don't support it. */
2040 if (code
== RTL_EXPR
)
2042 else if (code
== CONSTRUCTOR
)
2045 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2046 op1
= substitute_in_expr (TREE_OPERAND (exp
, 1), f
, r
);
2047 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
2050 new = fold (build (code
, TREE_TYPE (exp
), op0
, op1
));
2054 /* It cannot be that anything inside a SAVE_EXPR contains a
2055 PLACEHOLDER_EXPR. */
2056 if (code
== SAVE_EXPR
)
2059 else if (code
== CALL_EXPR
)
2061 op1
= substitute_in_expr (TREE_OPERAND (exp
, 1), f
, r
);
2062 if (op1
== TREE_OPERAND (exp
, 1))
2065 return build (code
, TREE_TYPE (exp
),
2066 TREE_OPERAND (exp
, 0), op1
, NULL_TREE
);
2069 else if (code
!= COND_EXPR
)
2072 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2073 op1
= substitute_in_expr (TREE_OPERAND (exp
, 1), f
, r
);
2074 op2
= substitute_in_expr (TREE_OPERAND (exp
, 2), f
, r
);
2075 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2076 && op2
== TREE_OPERAND (exp
, 2))
2079 new = fold (build (code
, TREE_TYPE (exp
), op0
, op1
, op2
));
2092 /* If this expression is getting a value from a PLACEHOLDER_EXPR
2093 and it is the right field, replace it with R. */
2094 for (inner
= TREE_OPERAND (exp
, 0);
2095 TREE_CODE_CLASS (TREE_CODE (inner
)) == 'r';
2096 inner
= TREE_OPERAND (inner
, 0))
2098 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
2099 && TREE_OPERAND (exp
, 1) == f
)
2102 /* If this expression hasn't been completed let, leave it
2104 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
2105 && TREE_TYPE (inner
) == 0)
2108 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2109 if (op0
== TREE_OPERAND (exp
, 0))
2112 new = fold (build (code
, TREE_TYPE (exp
), op0
,
2113 TREE_OPERAND (exp
, 1)));
2117 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2118 op1
= substitute_in_expr (TREE_OPERAND (exp
, 1), f
, r
);
2119 op2
= substitute_in_expr (TREE_OPERAND (exp
, 2), f
, r
);
2120 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2121 && op2
== TREE_OPERAND (exp
, 2))
2124 new = fold (build (code
, TREE_TYPE (exp
), op0
, op1
, op2
));
2129 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2130 if (op0
== TREE_OPERAND (exp
, 0))
2133 new = fold (build1 (code
, TREE_TYPE (exp
), op0
));
2145 TREE_READONLY (new) = TREE_READONLY (exp
);
2149 /* Stabilize a reference so that we can use it any number of times
2150 without causing its operands to be evaluated more than once.
2151 Returns the stabilized reference. This works by means of save_expr,
2152 so see the caveats in the comments about save_expr.
2154 Also allows conversion expressions whose operands are references.
2155 Any other kind of expression is returned unchanged. */
2158 stabilize_reference (ref
)
2162 enum tree_code code
= TREE_CODE (ref
);
2169 /* No action is needed in this case. */
2175 case FIX_TRUNC_EXPR
:
2176 case FIX_FLOOR_EXPR
:
2177 case FIX_ROUND_EXPR
:
2179 result
= build_nt (code
, stabilize_reference (TREE_OPERAND (ref
, 0)));
2183 result
= build_nt (INDIRECT_REF
,
2184 stabilize_reference_1 (TREE_OPERAND (ref
, 0)));
2188 result
= build_nt (COMPONENT_REF
,
2189 stabilize_reference (TREE_OPERAND (ref
, 0)),
2190 TREE_OPERAND (ref
, 1));
2194 result
= build_nt (BIT_FIELD_REF
,
2195 stabilize_reference (TREE_OPERAND (ref
, 0)),
2196 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2197 stabilize_reference_1 (TREE_OPERAND (ref
, 2)));
2201 result
= build_nt (ARRAY_REF
,
2202 stabilize_reference (TREE_OPERAND (ref
, 0)),
2203 stabilize_reference_1 (TREE_OPERAND (ref
, 1)));
2206 case ARRAY_RANGE_REF
:
2207 result
= build_nt (ARRAY_RANGE_REF
,
2208 stabilize_reference (TREE_OPERAND (ref
, 0)),
2209 stabilize_reference_1 (TREE_OPERAND (ref
, 1)));
2213 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2214 it wouldn't be ignored. This matters when dealing with
2216 return stabilize_reference_1 (ref
);
2219 result
= build1 (INDIRECT_REF
, TREE_TYPE (ref
),
2220 save_expr (build1 (ADDR_EXPR
,
2221 build_pointer_type (TREE_TYPE (ref
)),
2225 /* If arg isn't a kind of lvalue we recognize, make no change.
2226 Caller should recognize the error for an invalid lvalue. */
2231 return error_mark_node
;
2234 TREE_TYPE (result
) = TREE_TYPE (ref
);
2235 TREE_READONLY (result
) = TREE_READONLY (ref
);
2236 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (ref
);
2237 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (ref
);
2242 /* Subroutine of stabilize_reference; this is called for subtrees of
2243 references. Any expression with side-effects must be put in a SAVE_EXPR
2244 to ensure that it is only evaluated once.
2246 We don't put SAVE_EXPR nodes around everything, because assigning very
2247 simple expressions to temporaries causes us to miss good opportunities
2248 for optimizations. Among other things, the opportunity to fold in the
2249 addition of a constant into an addressing mode often gets lost, e.g.
2250 "y[i+1] += x;". In general, we take the approach that we should not make
2251 an assignment unless we are forced into it - i.e., that any non-side effect
2252 operator should be allowed, and that cse should take care of coalescing
2253 multiple utterances of the same expression should that prove fruitful. */
2256 stabilize_reference_1 (e
)
2260 enum tree_code code
= TREE_CODE (e
);
2262 /* We cannot ignore const expressions because it might be a reference
2263 to a const array but whose index contains side-effects. But we can
2264 ignore things that are actual constant or that already have been
2265 handled by this function. */
2267 if (TREE_CONSTANT (e
) || code
== SAVE_EXPR
)
2270 switch (TREE_CODE_CLASS (code
))
2280 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2281 so that it will only be evaluated once. */
2282 /* The reference (r) and comparison (<) classes could be handled as
2283 below, but it is generally faster to only evaluate them once. */
2284 if (TREE_SIDE_EFFECTS (e
))
2285 return save_expr (e
);
2289 /* Constants need no processing. In fact, we should never reach
2294 /* Division is slow and tends to be compiled with jumps,
2295 especially the division by powers of 2 that is often
2296 found inside of an array reference. So do it just once. */
2297 if (code
== TRUNC_DIV_EXPR
|| code
== TRUNC_MOD_EXPR
2298 || code
== FLOOR_DIV_EXPR
|| code
== FLOOR_MOD_EXPR
2299 || code
== CEIL_DIV_EXPR
|| code
== CEIL_MOD_EXPR
2300 || code
== ROUND_DIV_EXPR
|| code
== ROUND_MOD_EXPR
)
2301 return save_expr (e
);
2302 /* Recursively stabilize each operand. */
2303 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)),
2304 stabilize_reference_1 (TREE_OPERAND (e
, 1)));
2308 /* Recursively stabilize each operand. */
2309 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)));
2316 TREE_TYPE (result
) = TREE_TYPE (e
);
2317 TREE_READONLY (result
) = TREE_READONLY (e
);
2318 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (e
);
2319 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (e
);
2324 /* Low-level constructors for expressions. */
2326 /* Build an expression of code CODE, data type TYPE,
2327 and operands as specified by the arguments ARG1 and following arguments.
2328 Expressions and reference nodes can be created this way.
2329 Constants, decls, types and misc nodes cannot be. */
2332 build
VPARAMS ((enum tree_code code
, tree tt
, ...))
2341 VA_FIXEDARG (p
, enum tree_code
, code
);
2342 VA_FIXEDARG (p
, tree
, tt
);
2344 t
= make_node (code
);
2345 length
= TREE_CODE_LENGTH (code
);
2348 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
2349 result based on those same flags for the arguments. But if the
2350 arguments aren't really even `tree' expressions, we shouldn't be trying
2352 fro
= first_rtl_op (code
);
2354 /* Expressions without side effects may be constant if their
2355 arguments are as well. */
2356 constant
= (TREE_CODE_CLASS (code
) == '<'
2357 || TREE_CODE_CLASS (code
) == '1'
2358 || TREE_CODE_CLASS (code
) == '2'
2359 || TREE_CODE_CLASS (code
) == 'c');
2363 /* This is equivalent to the loop below, but faster. */
2364 tree arg0
= va_arg (p
, tree
);
2365 tree arg1
= va_arg (p
, tree
);
2367 TREE_OPERAND (t
, 0) = arg0
;
2368 TREE_OPERAND (t
, 1) = arg1
;
2369 TREE_READONLY (t
) = 1;
2370 if (arg0
&& fro
> 0)
2372 if (TREE_SIDE_EFFECTS (arg0
))
2373 TREE_SIDE_EFFECTS (t
) = 1;
2374 if (!TREE_READONLY (arg0
))
2375 TREE_READONLY (t
) = 0;
2376 if (!TREE_CONSTANT (arg0
))
2380 if (arg1
&& fro
> 1)
2382 if (TREE_SIDE_EFFECTS (arg1
))
2383 TREE_SIDE_EFFECTS (t
) = 1;
2384 if (!TREE_READONLY (arg1
))
2385 TREE_READONLY (t
) = 0;
2386 if (!TREE_CONSTANT (arg1
))
2390 else if (length
== 1)
2392 tree arg0
= va_arg (p
, tree
);
2394 /* The only one-operand cases we handle here are those with side-effects.
2395 Others are handled with build1. So don't bother checked if the
2396 arg has side-effects since we'll already have set it.
2398 ??? This really should use build1 too. */
2399 if (TREE_CODE_CLASS (code
) != 's')
2401 TREE_OPERAND (t
, 0) = arg0
;
2405 for (i
= 0; i
< length
; i
++)
2407 tree operand
= va_arg (p
, tree
);
2409 TREE_OPERAND (t
, i
) = operand
;
2410 if (operand
&& fro
> i
)
2412 if (TREE_SIDE_EFFECTS (operand
))
2413 TREE_SIDE_EFFECTS (t
) = 1;
2414 if (!TREE_CONSTANT (operand
))
2421 TREE_CONSTANT (t
) = constant
;
2425 /* Same as above, but only builds for unary operators.
2426 Saves lions share of calls to `build'; cuts down use
2427 of varargs, which is expensive for RISC machines. */
2430 build1 (code
, type
, node
)
2431 enum tree_code code
;
2436 #ifdef GATHER_STATISTICS
2437 tree_node_kind kind
;
2441 #ifdef GATHER_STATISTICS
2442 if (TREE_CODE_CLASS (code
) == 'r')
2448 #ifdef ENABLE_CHECKING
2449 if (TREE_CODE_CLASS (code
) == '2'
2450 || TREE_CODE_CLASS (code
) == '<'
2451 || TREE_CODE_LENGTH (code
) != 1)
2453 #endif /* ENABLE_CHECKING */
2455 length
= sizeof (struct tree_exp
);
2457 t
= ggc_alloc_tree (length
);
2459 memset ((PTR
) t
, 0, sizeof (struct tree_common
));
2461 #ifdef GATHER_STATISTICS
2462 tree_node_counts
[(int) kind
]++;
2463 tree_node_sizes
[(int) kind
] += length
;
2466 TREE_SET_CODE (t
, code
);
2468 TREE_TYPE (t
) = type
;
2469 TREE_COMPLEXITY (t
) = 0;
2470 TREE_OPERAND (t
, 0) = node
;
2471 if (node
&& first_rtl_op (code
) != 0)
2473 TREE_SIDE_EFFECTS (t
) = TREE_SIDE_EFFECTS (node
);
2474 TREE_READONLY (t
) = TREE_READONLY (node
);
2483 case PREDECREMENT_EXPR
:
2484 case PREINCREMENT_EXPR
:
2485 case POSTDECREMENT_EXPR
:
2486 case POSTINCREMENT_EXPR
:
2487 /* All of these have side-effects, no matter what their
2489 TREE_SIDE_EFFECTS (t
) = 1;
2490 TREE_READONLY (t
) = 0;
2494 if (TREE_CODE_CLASS (code
) == '1' && node
&& TREE_CONSTANT (node
))
2495 TREE_CONSTANT (t
) = 1;
2502 /* Similar except don't specify the TREE_TYPE
2503 and leave the TREE_SIDE_EFFECTS as 0.
2504 It is permissible for arguments to be null,
2505 or even garbage if their values do not matter. */
2508 build_nt
VPARAMS ((enum tree_code code
, ...))
2515 VA_FIXEDARG (p
, enum tree_code
, code
);
2517 t
= make_node (code
);
2518 length
= TREE_CODE_LENGTH (code
);
2520 for (i
= 0; i
< length
; i
++)
2521 TREE_OPERAND (t
, i
) = va_arg (p
, tree
);
2527 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
2528 We do NOT enter this node in any sort of symbol table.
2530 layout_decl is used to set up the decl's storage layout.
2531 Other slots are initialized to 0 or null pointers. */
2534 build_decl (code
, name
, type
)
2535 enum tree_code code
;
2540 t
= make_node (code
);
2542 /* if (type == error_mark_node)
2543 type = integer_type_node; */
2544 /* That is not done, deliberately, so that having error_mark_node
2545 as the type can suppress useless errors in the use of this variable. */
2547 DECL_NAME (t
) = name
;
2548 TREE_TYPE (t
) = type
;
2550 if (code
== VAR_DECL
|| code
== PARM_DECL
|| code
== RESULT_DECL
)
2552 else if (code
== FUNCTION_DECL
)
2553 DECL_MODE (t
) = FUNCTION_MODE
;
2558 /* BLOCK nodes are used to represent the structure of binding contours
2559 and declarations, once those contours have been exited and their contents
2560 compiled. This information is used for outputting debugging info. */
2563 build_block (vars
, tags
, subblocks
, supercontext
, chain
)
2564 tree vars
, tags ATTRIBUTE_UNUSED
, subblocks
, supercontext
, chain
;
2566 tree block
= make_node (BLOCK
);
2568 BLOCK_VARS (block
) = vars
;
2569 BLOCK_SUBBLOCKS (block
) = subblocks
;
2570 BLOCK_SUPERCONTEXT (block
) = supercontext
;
2571 BLOCK_CHAIN (block
) = chain
;
2575 /* EXPR_WITH_FILE_LOCATION are used to keep track of the exact
2576 location where an expression or an identifier were encountered. It
2577 is necessary for languages where the frontend parser will handle
2578 recursively more than one file (Java is one of them). */
2581 build_expr_wfl (node
, file
, line
, col
)
2586 static const char *last_file
= 0;
2587 static tree last_filenode
= NULL_TREE
;
2588 tree wfl
= make_node (EXPR_WITH_FILE_LOCATION
);
2590 EXPR_WFL_NODE (wfl
) = node
;
2591 EXPR_WFL_SET_LINECOL (wfl
, line
, col
);
2592 if (file
!= last_file
)
2595 last_filenode
= file
? get_identifier (file
) : NULL_TREE
;
2598 EXPR_WFL_FILENAME_NODE (wfl
) = last_filenode
;
2601 TREE_SIDE_EFFECTS (wfl
) = TREE_SIDE_EFFECTS (node
);
2602 TREE_TYPE (wfl
) = TREE_TYPE (node
);
2608 /* Return a declaration like DDECL except that its DECL_ATTRIBUTES
2612 build_decl_attribute_variant (ddecl
, attribute
)
2613 tree ddecl
, attribute
;
2615 DECL_ATTRIBUTES (ddecl
) = attribute
;
2619 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
2622 Record such modified types already made so we don't make duplicates. */
2625 build_type_attribute_variant (ttype
, attribute
)
2626 tree ttype
, attribute
;
2628 if ( ! attribute_list_equal (TYPE_ATTRIBUTES (ttype
), attribute
))
2630 unsigned int hashcode
;
2633 ntype
= copy_node (ttype
);
2635 TYPE_POINTER_TO (ntype
) = 0;
2636 TYPE_REFERENCE_TO (ntype
) = 0;
2637 TYPE_ATTRIBUTES (ntype
) = attribute
;
2639 /* Create a new main variant of TYPE. */
2640 TYPE_MAIN_VARIANT (ntype
) = ntype
;
2641 TYPE_NEXT_VARIANT (ntype
) = 0;
2642 set_type_quals (ntype
, TYPE_UNQUALIFIED
);
2644 hashcode
= (TYPE_HASH (TREE_CODE (ntype
))
2645 + TYPE_HASH (TREE_TYPE (ntype
))
2646 + attribute_hash_list (attribute
));
2648 switch (TREE_CODE (ntype
))
2651 hashcode
+= TYPE_HASH (TYPE_ARG_TYPES (ntype
));
2654 hashcode
+= TYPE_HASH (TYPE_DOMAIN (ntype
));
2657 hashcode
+= TYPE_HASH (TYPE_MAX_VALUE (ntype
));
2660 hashcode
+= TYPE_HASH (TYPE_PRECISION (ntype
));
2666 ntype
= type_hash_canon (hashcode
, ntype
);
2667 ttype
= build_qualified_type (ntype
, TYPE_QUALS (ttype
));
2673 /* Default value of targetm.comp_type_attributes that always returns 1. */
2676 default_comp_type_attributes (type1
, type2
)
2677 tree type1 ATTRIBUTE_UNUSED
;
2678 tree type2 ATTRIBUTE_UNUSED
;
2683 /* Default version of targetm.set_default_type_attributes that always does
2687 default_set_default_type_attributes (type
)
2688 tree type ATTRIBUTE_UNUSED
;
2692 /* Default version of targetm.insert_attributes that always does nothing. */
2694 default_insert_attributes (decl
, attr_ptr
)
2695 tree decl ATTRIBUTE_UNUSED
;
2696 tree
*attr_ptr ATTRIBUTE_UNUSED
;
2700 /* Default value of targetm.attribute_table that is empty. */
2701 const struct attribute_spec default_target_attribute_table
[] =
2703 { NULL
, 0, 0, false, false, false, NULL
}
2706 /* Default value of targetm.function_attribute_inlinable_p that always
2709 default_function_attribute_inlinable_p (fndecl
)
2710 tree fndecl ATTRIBUTE_UNUSED
;
2712 /* By default, functions with machine attributes cannot be inlined. */
2716 /* Return non-zero if IDENT is a valid name for attribute ATTR,
2719 We try both `text' and `__text__', ATTR may be either one. */
2720 /* ??? It might be a reasonable simplification to require ATTR to be only
2721 `text'. One might then also require attribute lists to be stored in
2722 their canonicalized form. */
2725 is_attribute_p (attr
, ident
)
2729 int ident_len
, attr_len
;
2732 if (TREE_CODE (ident
) != IDENTIFIER_NODE
)
2735 if (strcmp (attr
, IDENTIFIER_POINTER (ident
)) == 0)
2738 p
= IDENTIFIER_POINTER (ident
);
2739 ident_len
= strlen (p
);
2740 attr_len
= strlen (attr
);
2742 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
2746 || attr
[attr_len
- 2] != '_'
2747 || attr
[attr_len
- 1] != '_')
2749 if (ident_len
== attr_len
- 4
2750 && strncmp (attr
+ 2, p
, attr_len
- 4) == 0)
2755 if (ident_len
== attr_len
+ 4
2756 && p
[0] == '_' && p
[1] == '_'
2757 && p
[ident_len
- 2] == '_' && p
[ident_len
- 1] == '_'
2758 && strncmp (attr
, p
+ 2, attr_len
) == 0)
2765 /* Given an attribute name and a list of attributes, return a pointer to the
2766 attribute's list element if the attribute is part of the list, or NULL_TREE
2767 if not found. If the attribute appears more than once, this only
2768 returns the first occurrence; the TREE_CHAIN of the return value should
2769 be passed back in if further occurrences are wanted. */
2772 lookup_attribute (attr_name
, list
)
2773 const char *attr_name
;
2778 for (l
= list
; l
; l
= TREE_CHAIN (l
))
2780 if (TREE_CODE (TREE_PURPOSE (l
)) != IDENTIFIER_NODE
)
2782 if (is_attribute_p (attr_name
, TREE_PURPOSE (l
)))
2789 /* Return an attribute list that is the union of a1 and a2. */
2792 merge_attributes (a1
, a2
)
2797 /* Either one unset? Take the set one. */
2799 if ((attributes
= a1
) == 0)
2802 /* One that completely contains the other? Take it. */
2804 else if (a2
!= 0 && ! attribute_list_contained (a1
, a2
))
2806 if (attribute_list_contained (a2
, a1
))
2810 /* Pick the longest list, and hang on the other list. */
2812 if (list_length (a1
) < list_length (a2
))
2813 attributes
= a2
, a2
= a1
;
2815 for (; a2
!= 0; a2
= TREE_CHAIN (a2
))
2818 for (a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
2821 a
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
2824 if (simple_cst_equal (TREE_VALUE (a
), TREE_VALUE (a2
)) == 1)
2829 a1
= copy_node (a2
);
2830 TREE_CHAIN (a1
) = attributes
;
2839 /* Given types T1 and T2, merge their attributes and return
2843 merge_type_attributes (t1
, t2
)
2846 return merge_attributes (TYPE_ATTRIBUTES (t1
),
2847 TYPE_ATTRIBUTES (t2
));
2850 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
2854 merge_decl_attributes (olddecl
, newdecl
)
2855 tree olddecl
, newdecl
;
2857 return merge_attributes (DECL_ATTRIBUTES (olddecl
),
2858 DECL_ATTRIBUTES (newdecl
));
2861 #ifdef TARGET_DLLIMPORT_DECL_ATTRIBUTES
2863 /* Specialization of merge_decl_attributes for various Windows targets.
2865 This handles the following situation:
2867 __declspec (dllimport) int foo;
2870 The second instance of `foo' nullifies the dllimport. */
2873 merge_dllimport_decl_attributes (old
, new)
2878 int delete_dllimport_p
;
2880 old
= DECL_ATTRIBUTES (old
);
2881 new = DECL_ATTRIBUTES (new);
2883 /* What we need to do here is remove from `old' dllimport if it doesn't
2884 appear in `new'. dllimport behaves like extern: if a declaration is
2885 marked dllimport and a definition appears later, then the object
2886 is not dllimport'd. */
2887 if (lookup_attribute ("dllimport", old
) != NULL_TREE
2888 && lookup_attribute ("dllimport", new) == NULL_TREE
)
2889 delete_dllimport_p
= 1;
2891 delete_dllimport_p
= 0;
2893 a
= merge_attributes (old
, new);
2895 if (delete_dllimport_p
)
2899 /* Scan the list for dllimport and delete it. */
2900 for (prev
= NULL_TREE
, t
= a
; t
; prev
= t
, t
= TREE_CHAIN (t
))
2902 if (is_attribute_p ("dllimport", TREE_PURPOSE (t
)))
2904 if (prev
== NULL_TREE
)
2907 TREE_CHAIN (prev
) = TREE_CHAIN (t
);
2916 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
2918 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
2919 of the various TYPE_QUAL values. */
2922 set_type_quals (type
, type_quals
)
2926 TYPE_READONLY (type
) = (type_quals
& TYPE_QUAL_CONST
) != 0;
2927 TYPE_VOLATILE (type
) = (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
2928 TYPE_RESTRICT (type
) = (type_quals
& TYPE_QUAL_RESTRICT
) != 0;
2931 /* Return a version of the TYPE, qualified as indicated by the
2932 TYPE_QUALS, if one exists. If no qualified version exists yet,
2933 return NULL_TREE. */
2936 get_qualified_type (type
, type_quals
)
2942 /* Search the chain of variants to see if there is already one there just
2943 like the one we need to have. If so, use that existing one. We must
2944 preserve the TYPE_NAME, since there is code that depends on this. */
2945 for (t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
2946 if (TYPE_QUALS (t
) == type_quals
&& TYPE_NAME (t
) == TYPE_NAME (type
))
2952 /* Like get_qualified_type, but creates the type if it does not
2953 exist. This function never returns NULL_TREE. */
2956 build_qualified_type (type
, type_quals
)
2962 /* See if we already have the appropriate qualified variant. */
2963 t
= get_qualified_type (type
, type_quals
);
2965 /* If not, build it. */
2968 t
= build_type_copy (type
);
2969 set_type_quals (t
, type_quals
);
2975 /* Create a new variant of TYPE, equivalent but distinct.
2976 This is so the caller can modify it. */
2979 build_type_copy (type
)
2982 tree t
, m
= TYPE_MAIN_VARIANT (type
);
2984 t
= copy_node (type
);
2986 TYPE_POINTER_TO (t
) = 0;
2987 TYPE_REFERENCE_TO (t
) = 0;
2989 /* Add this type to the chain of variants of TYPE. */
2990 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (m
);
2991 TYPE_NEXT_VARIANT (m
) = t
;
2996 /* Hashing of types so that we don't make duplicates.
2997 The entry point is `type_hash_canon'. */
2999 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
3000 with types in the TREE_VALUE slots), by adding the hash codes
3001 of the individual types. */
3004 type_hash_list (list
)
3007 unsigned int hashcode
;
3010 for (hashcode
= 0, tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3011 hashcode
+= TYPE_HASH (TREE_VALUE (tail
));
3016 /* These are the Hashtable callback functions. */
3018 /* Returns true if the types are equal. */
3021 type_hash_eq (va
, vb
)
3025 const struct type_hash
*a
= va
, *b
= vb
;
3026 if (a
->hash
== b
->hash
3027 && TREE_CODE (a
->type
) == TREE_CODE (b
->type
)
3028 && TREE_TYPE (a
->type
) == TREE_TYPE (b
->type
)
3029 && attribute_list_equal (TYPE_ATTRIBUTES (a
->type
),
3030 TYPE_ATTRIBUTES (b
->type
))
3031 && TYPE_ALIGN (a
->type
) == TYPE_ALIGN (b
->type
)
3032 && (TYPE_MAX_VALUE (a
->type
) == TYPE_MAX_VALUE (b
->type
)
3033 || tree_int_cst_equal (TYPE_MAX_VALUE (a
->type
),
3034 TYPE_MAX_VALUE (b
->type
)))
3035 && (TYPE_MIN_VALUE (a
->type
) == TYPE_MIN_VALUE (b
->type
)
3036 || tree_int_cst_equal (TYPE_MIN_VALUE (a
->type
),
3037 TYPE_MIN_VALUE (b
->type
)))
3038 /* Note that TYPE_DOMAIN is TYPE_ARG_TYPES for FUNCTION_TYPE. */
3039 && (TYPE_DOMAIN (a
->type
) == TYPE_DOMAIN (b
->type
)
3040 || (TYPE_DOMAIN (a
->type
)
3041 && TREE_CODE (TYPE_DOMAIN (a
->type
)) == TREE_LIST
3042 && TYPE_DOMAIN (b
->type
)
3043 && TREE_CODE (TYPE_DOMAIN (b
->type
)) == TREE_LIST
3044 && type_list_equal (TYPE_DOMAIN (a
->type
),
3045 TYPE_DOMAIN (b
->type
)))))
3050 /* Return the cached hash value. */
3053 type_hash_hash (item
)
3056 return ((const struct type_hash
*) item
)->hash
;
3059 /* Look in the type hash table for a type isomorphic to TYPE.
3060 If one is found, return it. Otherwise return 0. */
3063 type_hash_lookup (hashcode
, type
)
3064 unsigned int hashcode
;
3067 struct type_hash
*h
, in
;
3069 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
3070 must call that routine before comparing TYPE_ALIGNs. */
3076 h
= htab_find_with_hash (type_hash_table
, &in
, hashcode
);
3082 /* Add an entry to the type-hash-table
3083 for a type TYPE whose hash code is HASHCODE. */
3086 type_hash_add (hashcode
, type
)
3087 unsigned int hashcode
;
3090 struct type_hash
*h
;
3093 h
= (struct type_hash
*) ggc_alloc (sizeof (struct type_hash
));
3096 loc
= htab_find_slot_with_hash (type_hash_table
, h
, hashcode
, INSERT
);
3097 *(struct type_hash
**) loc
= h
;
3100 /* Given TYPE, and HASHCODE its hash code, return the canonical
3101 object for an identical type if one already exists.
3102 Otherwise, return TYPE, and record it as the canonical object
3103 if it is a permanent object.
3105 To use this function, first create a type of the sort you want.
3106 Then compute its hash code from the fields of the type that
3107 make it different from other similar types.
3108 Then call this function and use the value.
3109 This function frees the type you pass in if it is a duplicate. */
3111 /* Set to 1 to debug without canonicalization. Never set by program. */
3112 int debug_no_type_hash
= 0;
3115 type_hash_canon (hashcode
, type
)
3116 unsigned int hashcode
;
3121 if (debug_no_type_hash
)
3124 /* See if the type is in the hash table already. If so, return it.
3125 Otherwise, add the type. */
3126 t1
= type_hash_lookup (hashcode
, type
);
3129 #ifdef GATHER_STATISTICS
3130 tree_node_counts
[(int) t_kind
]--;
3131 tree_node_sizes
[(int) t_kind
] -= sizeof (struct tree_type
);
3137 type_hash_add (hashcode
, type
);
3142 /* See if the data pointed to by the type hash table is marked. We consider
3143 it marked if the type is marked or if a debug type number or symbol
3144 table entry has been made for the type. This reduces the amount of
3145 debugging output and eliminates that dependency of the debug output on
3146 the number of garbage collections. */
3149 type_hash_marked_p (p
)
3152 tree type
= ((struct type_hash
*) p
)->type
;
3154 return ggc_marked_p (type
) || TYPE_SYMTAB_POINTER (type
);
3157 /* Mark the entry in the type hash table the type it points to is marked.
3158 Also mark the type in case we are considering this entry "marked" by
3159 virtue of TYPE_SYMTAB_POINTER being set. */
3166 ggc_mark_tree (((struct type_hash
*) p
)->type
);
3169 /* Mark the hashtable slot pointed to by ENTRY (which is really a
3170 `tree**') for GC. */
3173 mark_tree_hashtable_entry (entry
, data
)
3175 void *data ATTRIBUTE_UNUSED
;
3177 ggc_mark_tree ((tree
) *entry
);
3181 /* Mark ARG (which is really a htab_t whose slots are trees) for
3185 mark_tree_hashtable (arg
)
3188 htab_t t
= *(htab_t
*) arg
;
3189 htab_traverse (t
, mark_tree_hashtable_entry
, 0);
3193 print_type_hash_statistics ()
3195 fprintf (stderr
, "Type hash: size %ld, %ld elements, %f collisions\n",
3196 (long) htab_size (type_hash_table
),
3197 (long) htab_elements (type_hash_table
),
3198 htab_collisions (type_hash_table
));
3201 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
3202 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
3203 by adding the hash codes of the individual attributes. */
3206 attribute_hash_list (list
)
3209 unsigned int hashcode
;
3212 for (hashcode
= 0, tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3213 /* ??? Do we want to add in TREE_VALUE too? */
3214 hashcode
+= TYPE_HASH (TREE_PURPOSE (tail
));
3218 /* Given two lists of attributes, return true if list l2 is
3219 equivalent to l1. */
3222 attribute_list_equal (l1
, l2
)
3225 return attribute_list_contained (l1
, l2
)
3226 && attribute_list_contained (l2
, l1
);
3229 /* Given two lists of attributes, return true if list L2 is
3230 completely contained within L1. */
3231 /* ??? This would be faster if attribute names were stored in a canonicalized
3232 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
3233 must be used to show these elements are equivalent (which they are). */
3234 /* ??? It's not clear that attributes with arguments will always be handled
3238 attribute_list_contained (l1
, l2
)
3243 /* First check the obvious, maybe the lists are identical. */
3247 /* Maybe the lists are similar. */
3248 for (t1
= l1
, t2
= l2
;
3250 && TREE_PURPOSE (t1
) == TREE_PURPOSE (t2
)
3251 && TREE_VALUE (t1
) == TREE_VALUE (t2
);
3252 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
));
3254 /* Maybe the lists are equal. */
3255 if (t1
== 0 && t2
== 0)
3258 for (; t2
!= 0; t2
= TREE_CHAIN (t2
))
3261 for (attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)), l1
);
3263 attr
= lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)),
3266 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) == 1)
3273 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) != 1)
3280 /* Given two lists of types
3281 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
3282 return 1 if the lists contain the same types in the same order.
3283 Also, the TREE_PURPOSEs must match. */
3286 type_list_equal (l1
, l2
)
3291 for (t1
= l1
, t2
= l2
; t1
&& t2
; t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
3292 if (TREE_VALUE (t1
) != TREE_VALUE (t2
)
3293 || (TREE_PURPOSE (t1
) != TREE_PURPOSE (t2
)
3294 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1
), TREE_PURPOSE (t2
))
3295 && (TREE_TYPE (TREE_PURPOSE (t1
))
3296 == TREE_TYPE (TREE_PURPOSE (t2
))))))
3302 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
3303 given by TYPE. If the argument list accepts variable arguments,
3304 then this function counts only the ordinary arguments. */
3307 type_num_arguments (type
)
3313 for (t
= TYPE_ARG_TYPES (type
); t
; t
= TREE_CHAIN (t
))
3314 /* If the function does not take a variable number of arguments,
3315 the last element in the list will have type `void'. */
3316 if (VOID_TYPE_P (TREE_VALUE (t
)))
3324 /* Nonzero if integer constants T1 and T2
3325 represent the same constant value. */
3328 tree_int_cst_equal (t1
, t2
)
3334 if (t1
== 0 || t2
== 0)
3337 if (TREE_CODE (t1
) == INTEGER_CST
3338 && TREE_CODE (t2
) == INTEGER_CST
3339 && TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
3340 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
))
3346 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
3347 The precise way of comparison depends on their data type. */
3350 tree_int_cst_lt (t1
, t2
)
3356 if (! TREE_UNSIGNED (TREE_TYPE (t1
)))
3357 return INT_CST_LT (t1
, t2
);
3359 return INT_CST_LT_UNSIGNED (t1
, t2
);
3362 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
3365 tree_int_cst_compare (t1
, t2
)
3369 if (tree_int_cst_lt (t1
, t2
))
3371 else if (tree_int_cst_lt (t2
, t1
))
3377 /* Return 1 if T is an INTEGER_CST that can be represented in a single
3378 HOST_WIDE_INT value. If POS is nonzero, the result must be positive. */
3381 host_integerp (t
, pos
)
3385 return (TREE_CODE (t
) == INTEGER_CST
3386 && ! TREE_OVERFLOW (t
)
3387 && ((TREE_INT_CST_HIGH (t
) == 0
3388 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) >= 0)
3389 || (! pos
&& TREE_INT_CST_HIGH (t
) == -1
3390 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0)
3391 || (! pos
&& TREE_INT_CST_HIGH (t
) == 0
3392 && TREE_UNSIGNED (TREE_TYPE (t
)))));
3395 /* Return the HOST_WIDE_INT least significant bits of T if it is an
3396 INTEGER_CST and there is no overflow. POS is nonzero if the result must
3397 be positive. Abort if we cannot satisfy the above conditions. */
3400 tree_low_cst (t
, pos
)
3404 if (host_integerp (t
, pos
))
3405 return TREE_INT_CST_LOW (t
);
3410 /* Return the most significant bit of the integer constant T. */
3413 tree_int_cst_msb (t
)
3418 unsigned HOST_WIDE_INT l
;
3420 /* Note that using TYPE_PRECISION here is wrong. We care about the
3421 actual bits, not the (arbitrary) range of the type. */
3422 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t
))) - 1;
3423 rshift_double (TREE_INT_CST_LOW (t
), TREE_INT_CST_HIGH (t
), prec
,
3424 2 * HOST_BITS_PER_WIDE_INT
, &l
, &h
, 0);
3425 return (l
& 1) == 1;
3428 /* Return an indication of the sign of the integer constant T.
3429 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
3430 Note that -1 will never be returned it T's type is unsigned. */
3433 tree_int_cst_sgn (t
)
3436 if (TREE_INT_CST_LOW (t
) == 0 && TREE_INT_CST_HIGH (t
) == 0)
3438 else if (TREE_UNSIGNED (TREE_TYPE (t
)))
3440 else if (TREE_INT_CST_HIGH (t
) < 0)
3446 /* Compare two constructor-element-type constants. Return 1 if the lists
3447 are known to be equal; otherwise return 0. */
3450 simple_cst_list_equal (l1
, l2
)
3453 while (l1
!= NULL_TREE
&& l2
!= NULL_TREE
)
3455 if (simple_cst_equal (TREE_VALUE (l1
), TREE_VALUE (l2
)) != 1)
3458 l1
= TREE_CHAIN (l1
);
3459 l2
= TREE_CHAIN (l2
);
3465 /* Return truthvalue of whether T1 is the same tree structure as T2.
3466 Return 1 if they are the same.
3467 Return 0 if they are understandably different.
3468 Return -1 if either contains tree structure not understood by
3472 simple_cst_equal (t1
, t2
)
3475 enum tree_code code1
, code2
;
3481 if (t1
== 0 || t2
== 0)
3484 code1
= TREE_CODE (t1
);
3485 code2
= TREE_CODE (t2
);
3487 if (code1
== NOP_EXPR
|| code1
== CONVERT_EXPR
|| code1
== NON_LVALUE_EXPR
)
3489 if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
3490 || code2
== NON_LVALUE_EXPR
)
3491 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3493 return simple_cst_equal (TREE_OPERAND (t1
, 0), t2
);
3496 else if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
3497 || code2
== NON_LVALUE_EXPR
)
3498 return simple_cst_equal (t1
, TREE_OPERAND (t2
, 0));
3506 return (TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
3507 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
));
3510 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3513 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3514 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3515 TREE_STRING_LENGTH (t1
)));
3518 if (CONSTRUCTOR_ELTS (t1
) == CONSTRUCTOR_ELTS (t2
))
3524 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3527 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3531 simple_cst_list_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
3534 /* Special case: if either target is an unallocated VAR_DECL,
3535 it means that it's going to be unified with whatever the
3536 TARGET_EXPR is really supposed to initialize, so treat it
3537 as being equivalent to anything. */
3538 if ((TREE_CODE (TREE_OPERAND (t1
, 0)) == VAR_DECL
3539 && DECL_NAME (TREE_OPERAND (t1
, 0)) == NULL_TREE
3540 && !DECL_RTL_SET_P (TREE_OPERAND (t1
, 0)))
3541 || (TREE_CODE (TREE_OPERAND (t2
, 0)) == VAR_DECL
3542 && DECL_NAME (TREE_OPERAND (t2
, 0)) == NULL_TREE
3543 && !DECL_RTL_SET_P (TREE_OPERAND (t2
, 0))))
3546 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3551 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
3553 case WITH_CLEANUP_EXPR
:
3554 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3558 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t1
, 1));
3561 if (TREE_OPERAND (t1
, 1) == TREE_OPERAND (t2
, 1))
3562 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3576 /* This general rule works for most tree codes. All exceptions should be
3577 handled above. If this is a language-specific tree code, we can't
3578 trust what might be in the operand, so say we don't know
3580 if ((int) code1
>= (int) LAST_AND_UNUSED_TREE_CODE
)
3583 switch (TREE_CODE_CLASS (code1
))
3592 for (i
= 0; i
< TREE_CODE_LENGTH (code1
); i
++)
3594 cmp
= simple_cst_equal (TREE_OPERAND (t1
, i
), TREE_OPERAND (t2
, i
));
3606 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
3607 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
3608 than U, respectively. */
3611 compare_tree_int (t
, u
)
3615 if (tree_int_cst_sgn (t
) < 0)
3617 else if (TREE_INT_CST_HIGH (t
) != 0)
3619 else if (TREE_INT_CST_LOW (t
) == u
)
3621 else if (TREE_INT_CST_LOW (t
) < u
)
3627 /* Constructors for pointer, array and function types.
3628 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
3629 constructed by language-dependent code, not here.) */
3631 /* Construct, lay out and return the type of pointers to TO_TYPE.
3632 If such a type has already been constructed, reuse it. */
3635 build_pointer_type (to_type
)
3638 tree t
= TYPE_POINTER_TO (to_type
);
3640 /* First, if we already have a type for pointers to TO_TYPE, use it. */
3645 /* We need a new one. */
3646 t
= make_node (POINTER_TYPE
);
3648 TREE_TYPE (t
) = to_type
;
3650 /* Record this type as the pointer to TO_TYPE. */
3651 TYPE_POINTER_TO (to_type
) = t
;
3653 /* Lay out the type. This function has many callers that are concerned
3654 with expression-construction, and this simplifies them all.
3655 Also, it guarantees the TYPE_SIZE is in the same obstack as the type. */
3661 /* Build the node for the type of references-to-TO_TYPE. */
3664 build_reference_type (to_type
)
3667 tree t
= TYPE_REFERENCE_TO (to_type
);
3669 /* First, if we already have a type for pointers to TO_TYPE, use it. */
3674 /* We need a new one. */
3675 t
= make_node (REFERENCE_TYPE
);
3677 TREE_TYPE (t
) = to_type
;
3679 /* Record this type as the pointer to TO_TYPE. */
3680 TYPE_REFERENCE_TO (to_type
) = t
;
3687 /* Build a type that is compatible with t but has no cv quals anywhere
3690 const char *const *const * -> char ***. */
3693 build_type_no_quals (t
)
3696 switch (TREE_CODE (t
))
3699 return build_pointer_type (build_type_no_quals (TREE_TYPE (t
)));
3700 case REFERENCE_TYPE
:
3701 return build_reference_type (build_type_no_quals (TREE_TYPE (t
)));
3703 return TYPE_MAIN_VARIANT (t
);
3707 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
3708 MAXVAL should be the maximum value in the domain
3709 (one less than the length of the array).
3711 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
3712 We don't enforce this limit, that is up to caller (e.g. language front end).
3713 The limit exists because the result is a signed type and we don't handle
3714 sizes that use more than one HOST_WIDE_INT. */
3717 build_index_type (maxval
)
3720 tree itype
= make_node (INTEGER_TYPE
);
3722 TREE_TYPE (itype
) = sizetype
;
3723 TYPE_PRECISION (itype
) = TYPE_PRECISION (sizetype
);
3724 TYPE_MIN_VALUE (itype
) = size_zero_node
;
3725 TYPE_MAX_VALUE (itype
) = convert (sizetype
, maxval
);
3726 TYPE_MODE (itype
) = TYPE_MODE (sizetype
);
3727 TYPE_SIZE (itype
) = TYPE_SIZE (sizetype
);
3728 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (sizetype
);
3729 TYPE_ALIGN (itype
) = TYPE_ALIGN (sizetype
);
3730 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (sizetype
);
3732 if (host_integerp (maxval
, 1))
3733 return type_hash_canon (tree_low_cst (maxval
, 1), itype
);
3738 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
3739 ENUMERAL_TYPE, BOOLEAN_TYPE, or CHAR_TYPE), with
3740 low bound LOWVAL and high bound HIGHVAL.
3741 if TYPE==NULL_TREE, sizetype is used. */
3744 build_range_type (type
, lowval
, highval
)
3745 tree type
, lowval
, highval
;
3747 tree itype
= make_node (INTEGER_TYPE
);
3749 TREE_TYPE (itype
) = type
;
3750 if (type
== NULL_TREE
)
3753 TYPE_MIN_VALUE (itype
) = convert (type
, lowval
);
3754 TYPE_MAX_VALUE (itype
) = highval
? convert (type
, highval
) : NULL
;
3756 TYPE_PRECISION (itype
) = TYPE_PRECISION (type
);
3757 TYPE_MODE (itype
) = TYPE_MODE (type
);
3758 TYPE_SIZE (itype
) = TYPE_SIZE (type
);
3759 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (type
);
3760 TYPE_ALIGN (itype
) = TYPE_ALIGN (type
);
3761 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (type
);
3763 if (host_integerp (lowval
, 0) && highval
!= 0 && host_integerp (highval
, 0))
3764 return type_hash_canon (tree_low_cst (highval
, 0)
3765 - tree_low_cst (lowval
, 0),
3771 /* Just like build_index_type, but takes lowval and highval instead
3772 of just highval (maxval). */
3775 build_index_2_type (lowval
,highval
)
3776 tree lowval
, highval
;
3778 return build_range_type (sizetype
, lowval
, highval
);
3781 /* Return nonzero iff ITYPE1 and ITYPE2 are equal (in the LISP sense).
3782 Needed because when index types are not hashed, equal index types
3783 built at different times appear distinct, even though structurally,
3787 index_type_equal (itype1
, itype2
)
3788 tree itype1
, itype2
;
3790 if (TREE_CODE (itype1
) != TREE_CODE (itype2
))
3793 if (TREE_CODE (itype1
) == INTEGER_TYPE
)
3795 if (TYPE_PRECISION (itype1
) != TYPE_PRECISION (itype2
)
3796 || TYPE_MODE (itype1
) != TYPE_MODE (itype2
)
3797 || simple_cst_equal (TYPE_SIZE (itype1
), TYPE_SIZE (itype2
)) != 1
3798 || TYPE_ALIGN (itype1
) != TYPE_ALIGN (itype2
))
3801 if (1 == simple_cst_equal (TYPE_MIN_VALUE (itype1
),
3802 TYPE_MIN_VALUE (itype2
))
3803 && 1 == simple_cst_equal (TYPE_MAX_VALUE (itype1
),
3804 TYPE_MAX_VALUE (itype2
)))
3811 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
3812 and number of elements specified by the range of values of INDEX_TYPE.
3813 If such a type has already been constructed, reuse it. */
3816 build_array_type (elt_type
, index_type
)
3817 tree elt_type
, index_type
;
3820 unsigned int hashcode
;
3822 if (TREE_CODE (elt_type
) == FUNCTION_TYPE
)
3824 error ("arrays of functions are not meaningful");
3825 elt_type
= integer_type_node
;
3828 /* Make sure TYPE_POINTER_TO (elt_type) is filled in. */
3829 build_pointer_type (elt_type
);
3831 /* Allocate the array after the pointer type,
3832 in case we free it in type_hash_canon. */
3833 t
= make_node (ARRAY_TYPE
);
3834 TREE_TYPE (t
) = elt_type
;
3835 TYPE_DOMAIN (t
) = index_type
;
3837 if (index_type
== 0)
3842 hashcode
= TYPE_HASH (elt_type
) + TYPE_HASH (index_type
);
3843 t
= type_hash_canon (hashcode
, t
);
3845 if (!COMPLETE_TYPE_P (t
))
3850 /* Return the TYPE of the elements comprising
3851 the innermost dimension of ARRAY. */
3854 get_inner_array_type (array
)
3857 tree type
= TREE_TYPE (array
);
3859 while (TREE_CODE (type
) == ARRAY_TYPE
)
3860 type
= TREE_TYPE (type
);
3865 /* Construct, lay out and return
3866 the type of functions returning type VALUE_TYPE
3867 given arguments of types ARG_TYPES.
3868 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
3869 are data type nodes for the arguments of the function.
3870 If such a type has already been constructed, reuse it. */
3873 build_function_type (value_type
, arg_types
)
3874 tree value_type
, arg_types
;
3877 unsigned int hashcode
;
3879 if (TREE_CODE (value_type
) == FUNCTION_TYPE
)
3881 error ("function return type cannot be function");
3882 value_type
= integer_type_node
;
3885 /* Make a node of the sort we want. */
3886 t
= make_node (FUNCTION_TYPE
);
3887 TREE_TYPE (t
) = value_type
;
3888 TYPE_ARG_TYPES (t
) = arg_types
;
3890 /* If we already have such a type, use the old one and free this one. */
3891 hashcode
= TYPE_HASH (value_type
) + type_hash_list (arg_types
);
3892 t
= type_hash_canon (hashcode
, t
);
3894 if (!COMPLETE_TYPE_P (t
))
3899 /* Construct, lay out and return the type of methods belonging to class
3900 BASETYPE and whose arguments and values are described by TYPE.
3901 If that type exists already, reuse it.
3902 TYPE must be a FUNCTION_TYPE node. */
3905 build_method_type (basetype
, type
)
3906 tree basetype
, type
;
3909 unsigned int hashcode
;
3911 /* Make a node of the sort we want. */
3912 t
= make_node (METHOD_TYPE
);
3914 if (TREE_CODE (type
) != FUNCTION_TYPE
)
3917 TYPE_METHOD_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
3918 TREE_TYPE (t
) = TREE_TYPE (type
);
3920 /* The actual arglist for this function includes a "hidden" argument
3921 which is "this". Put it into the list of argument types. */
3924 = tree_cons (NULL_TREE
,
3925 build_pointer_type (basetype
), TYPE_ARG_TYPES (type
));
3927 /* If we already have such a type, use the old one and free this one. */
3928 hashcode
= TYPE_HASH (basetype
) + TYPE_HASH (type
);
3929 t
= type_hash_canon (hashcode
, t
);
3931 if (!COMPLETE_TYPE_P (t
))
3937 /* Construct, lay out and return the type of offsets to a value
3938 of type TYPE, within an object of type BASETYPE.
3939 If a suitable offset type exists already, reuse it. */
3942 build_offset_type (basetype
, type
)
3943 tree basetype
, type
;
3946 unsigned int hashcode
;
3948 /* Make a node of the sort we want. */
3949 t
= make_node (OFFSET_TYPE
);
3951 TYPE_OFFSET_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
3952 TREE_TYPE (t
) = type
;
3954 /* If we already have such a type, use the old one and free this one. */
3955 hashcode
= TYPE_HASH (basetype
) + TYPE_HASH (type
);
3956 t
= type_hash_canon (hashcode
, t
);
3958 if (!COMPLETE_TYPE_P (t
))
3964 /* Create a complex type whose components are COMPONENT_TYPE. */
3967 build_complex_type (component_type
)
3968 tree component_type
;
3971 unsigned int hashcode
;
3973 /* Make a node of the sort we want. */
3974 t
= make_node (COMPLEX_TYPE
);
3976 TREE_TYPE (t
) = TYPE_MAIN_VARIANT (component_type
);
3977 set_type_quals (t
, TYPE_QUALS (component_type
));
3979 /* If we already have such a type, use the old one and free this one. */
3980 hashcode
= TYPE_HASH (component_type
);
3981 t
= type_hash_canon (hashcode
, t
);
3983 if (!COMPLETE_TYPE_P (t
))
3986 /* If we are writing Dwarf2 output we need to create a name,
3987 since complex is a fundamental type. */
3988 if (write_symbols
== DWARF2_DEBUG
&& ! TYPE_NAME (t
))
3991 if (component_type
== char_type_node
)
3992 name
= "complex char";
3993 else if (component_type
== signed_char_type_node
)
3994 name
= "complex signed char";
3995 else if (component_type
== unsigned_char_type_node
)
3996 name
= "complex unsigned char";
3997 else if (component_type
== short_integer_type_node
)
3998 name
= "complex short int";
3999 else if (component_type
== short_unsigned_type_node
)
4000 name
= "complex short unsigned int";
4001 else if (component_type
== integer_type_node
)
4002 name
= "complex int";
4003 else if (component_type
== unsigned_type_node
)
4004 name
= "complex unsigned int";
4005 else if (component_type
== long_integer_type_node
)
4006 name
= "complex long int";
4007 else if (component_type
== long_unsigned_type_node
)
4008 name
= "complex long unsigned int";
4009 else if (component_type
== long_long_integer_type_node
)
4010 name
= "complex long long int";
4011 else if (component_type
== long_long_unsigned_type_node
)
4012 name
= "complex long long unsigned int";
4017 TYPE_NAME (t
) = get_identifier (name
);
4023 /* Return OP, stripped of any conversions to wider types as much as is safe.
4024 Converting the value back to OP's type makes a value equivalent to OP.
4026 If FOR_TYPE is nonzero, we return a value which, if converted to
4027 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
4029 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
4030 narrowest type that can hold the value, even if they don't exactly fit.
4031 Otherwise, bit-field references are changed to a narrower type
4032 only if they can be fetched directly from memory in that type.
4034 OP must have integer, real or enumeral type. Pointers are not allowed!
4036 There are some cases where the obvious value we could return
4037 would regenerate to OP if converted to OP's type,
4038 but would not extend like OP to wider types.
4039 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
4040 For example, if OP is (unsigned short)(signed char)-1,
4041 we avoid returning (signed char)-1 if FOR_TYPE is int,
4042 even though extending that to an unsigned short would regenerate OP,
4043 since the result of extending (signed char)-1 to (int)
4044 is different from (int) OP. */
4047 get_unwidened (op
, for_type
)
4051 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
4052 tree type
= TREE_TYPE (op
);
4054 = TYPE_PRECISION (for_type
!= 0 ? for_type
: type
);
4056 = (for_type
!= 0 && for_type
!= type
4057 && final_prec
> TYPE_PRECISION (type
)
4058 && TREE_UNSIGNED (type
));
4061 while (TREE_CODE (op
) == NOP_EXPR
)
4064 = TYPE_PRECISION (TREE_TYPE (op
))
4065 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0)));
4067 /* Truncations are many-one so cannot be removed.
4068 Unless we are later going to truncate down even farther. */
4070 && final_prec
> TYPE_PRECISION (TREE_TYPE (op
)))
4073 /* See what's inside this conversion. If we decide to strip it,
4075 op
= TREE_OPERAND (op
, 0);
4077 /* If we have not stripped any zero-extensions (uns is 0),
4078 we can strip any kind of extension.
4079 If we have previously stripped a zero-extension,
4080 only zero-extensions can safely be stripped.
4081 Any extension can be stripped if the bits it would produce
4082 are all going to be discarded later by truncating to FOR_TYPE. */
4086 if (! uns
|| final_prec
<= TYPE_PRECISION (TREE_TYPE (op
)))
4088 /* TREE_UNSIGNED says whether this is a zero-extension.
4089 Let's avoid computing it if it does not affect WIN
4090 and if UNS will not be needed again. */
4091 if ((uns
|| TREE_CODE (op
) == NOP_EXPR
)
4092 && TREE_UNSIGNED (TREE_TYPE (op
)))
4100 if (TREE_CODE (op
) == COMPONENT_REF
4101 /* Since type_for_size always gives an integer type. */
4102 && TREE_CODE (type
) != REAL_TYPE
4103 /* Don't crash if field not laid out yet. */
4104 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
4105 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
4107 unsigned int innerprec
4108 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
4110 type
= type_for_size (innerprec
, TREE_UNSIGNED (TREE_OPERAND (op
, 1)));
4112 /* We can get this structure field in the narrowest type it fits in.
4113 If FOR_TYPE is 0, do this only for a field that matches the
4114 narrower type exactly and is aligned for it
4115 The resulting extension to its nominal type (a fullword type)
4116 must fit the same conditions as for other extensions. */
4118 if (innerprec
< TYPE_PRECISION (TREE_TYPE (op
))
4119 && (for_type
|| ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1)))
4120 && (! uns
|| final_prec
<= innerprec
4121 || TREE_UNSIGNED (TREE_OPERAND (op
, 1)))
4124 win
= build (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
4125 TREE_OPERAND (op
, 1));
4126 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
4127 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
4134 /* Return OP or a simpler expression for a narrower value
4135 which can be sign-extended or zero-extended to give back OP.
4136 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
4137 or 0 if the value should be sign-extended. */
4140 get_narrower (op
, unsignedp_ptr
)
4148 while (TREE_CODE (op
) == NOP_EXPR
)
4151 = (TYPE_PRECISION (TREE_TYPE (op
))
4152 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0))));
4154 /* Truncations are many-one so cannot be removed. */
4158 /* See what's inside this conversion. If we decide to strip it,
4160 op
= TREE_OPERAND (op
, 0);
4164 /* An extension: the outermost one can be stripped,
4165 but remember whether it is zero or sign extension. */
4167 uns
= TREE_UNSIGNED (TREE_TYPE (op
));
4168 /* Otherwise, if a sign extension has been stripped,
4169 only sign extensions can now be stripped;
4170 if a zero extension has been stripped, only zero-extensions. */
4171 else if (uns
!= TREE_UNSIGNED (TREE_TYPE (op
)))
4175 else /* bitschange == 0 */
4177 /* A change in nominal type can always be stripped, but we must
4178 preserve the unsignedness. */
4180 uns
= TREE_UNSIGNED (TREE_TYPE (op
));
4187 if (TREE_CODE (op
) == COMPONENT_REF
4188 /* Since type_for_size always gives an integer type. */
4189 && TREE_CODE (TREE_TYPE (op
)) != REAL_TYPE
4190 /* Ensure field is laid out already. */
4191 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0)
4193 unsigned HOST_WIDE_INT innerprec
4194 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
4195 tree type
= type_for_size (innerprec
, TREE_UNSIGNED (op
));
4197 /* We can get this structure field in a narrower type that fits it,
4198 but the resulting extension to its nominal type (a fullword type)
4199 must satisfy the same conditions as for other extensions.
4201 Do this only for fields that are aligned (not bit-fields),
4202 because when bit-field insns will be used there is no
4203 advantage in doing this. */
4205 if (innerprec
< TYPE_PRECISION (TREE_TYPE (op
))
4206 && ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1))
4207 && (first
|| uns
== TREE_UNSIGNED (TREE_OPERAND (op
, 1)))
4211 uns
= TREE_UNSIGNED (TREE_OPERAND (op
, 1));
4212 win
= build (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
4213 TREE_OPERAND (op
, 1));
4214 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
4215 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
4218 *unsignedp_ptr
= uns
;
4222 /* Nonzero if integer constant C has a value that is permissible
4223 for type TYPE (an INTEGER_TYPE). */
4226 int_fits_type_p (c
, type
)
4229 /* If the bounds of the type are integers, we can check ourselves.
4230 Otherwise,. use force_fit_type, which checks against the precision. */
4231 if (TYPE_MAX_VALUE (type
) != NULL_TREE
4232 && TYPE_MIN_VALUE (type
) != NULL_TREE
4233 && TREE_CODE (TYPE_MAX_VALUE (type
)) == INTEGER_CST
4234 && TREE_CODE (TYPE_MIN_VALUE (type
)) == INTEGER_CST
)
4236 if (TREE_UNSIGNED (type
))
4237 return (! INT_CST_LT_UNSIGNED (TYPE_MAX_VALUE (type
), c
)
4238 && ! INT_CST_LT_UNSIGNED (c
, TYPE_MIN_VALUE (type
))
4239 /* Negative ints never fit unsigned types. */
4240 && ! (TREE_INT_CST_HIGH (c
) < 0
4241 && ! TREE_UNSIGNED (TREE_TYPE (c
))));
4243 return (! INT_CST_LT (TYPE_MAX_VALUE (type
), c
)
4244 && ! INT_CST_LT (c
, TYPE_MIN_VALUE (type
))
4245 /* Unsigned ints with top bit set never fit signed types. */
4246 && ! (TREE_INT_CST_HIGH (c
) < 0
4247 && TREE_UNSIGNED (TREE_TYPE (c
))));
4252 TREE_TYPE (c
) = type
;
4253 return !force_fit_type (c
, 0);
4257 /* Given a DECL or TYPE, return the scope in which it was declared, or
4258 NULL_TREE if there is no containing scope. */
4261 get_containing_scope (t
)
4264 return (TYPE_P (t
) ? TYPE_CONTEXT (t
) : DECL_CONTEXT (t
));
4267 /* Return the innermost context enclosing DECL that is
4268 a FUNCTION_DECL, or zero if none. */
4271 decl_function_context (decl
)
4276 if (TREE_CODE (decl
) == ERROR_MARK
)
4279 if (TREE_CODE (decl
) == SAVE_EXPR
)
4280 context
= SAVE_EXPR_CONTEXT (decl
);
4282 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
4283 where we look up the function at runtime. Such functions always take
4284 a first argument of type 'pointer to real context'.
4286 C++ should really be fixed to use DECL_CONTEXT for the real context,
4287 and use something else for the "virtual context". */
4288 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_VINDEX (decl
))
4291 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl
)))));
4293 context
= DECL_CONTEXT (decl
);
4295 while (context
&& TREE_CODE (context
) != FUNCTION_DECL
)
4297 if (TREE_CODE (context
) == BLOCK
)
4298 context
= BLOCK_SUPERCONTEXT (context
);
4300 context
= get_containing_scope (context
);
4306 /* Return the innermost context enclosing DECL that is
4307 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
4308 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
4311 decl_type_context (decl
)
4314 tree context
= DECL_CONTEXT (decl
);
4318 if (TREE_CODE (context
) == RECORD_TYPE
4319 || TREE_CODE (context
) == UNION_TYPE
4320 || TREE_CODE (context
) == QUAL_UNION_TYPE
)
4323 if (TREE_CODE (context
) == TYPE_DECL
4324 || TREE_CODE (context
) == FUNCTION_DECL
)
4325 context
= DECL_CONTEXT (context
);
4327 else if (TREE_CODE (context
) == BLOCK
)
4328 context
= BLOCK_SUPERCONTEXT (context
);
4331 /* Unhandled CONTEXT!? */
4337 /* CALL is a CALL_EXPR. Return the declaration for the function
4338 called, or NULL_TREE if the called function cannot be
4342 get_callee_fndecl (call
)
4347 /* It's invalid to call this function with anything but a
4349 if (TREE_CODE (call
) != CALL_EXPR
)
4352 /* The first operand to the CALL is the address of the function
4354 addr
= TREE_OPERAND (call
, 0);
4358 /* If this is a readonly function pointer, extract its initial value. */
4359 if (DECL_P (addr
) && TREE_CODE (addr
) != FUNCTION_DECL
4360 && TREE_READONLY (addr
) && ! TREE_THIS_VOLATILE (addr
)
4361 && DECL_INITIAL (addr
))
4362 addr
= DECL_INITIAL (addr
);
4364 /* If the address is just `&f' for some function `f', then we know
4365 that `f' is being called. */
4366 if (TREE_CODE (addr
) == ADDR_EXPR
4367 && TREE_CODE (TREE_OPERAND (addr
, 0)) == FUNCTION_DECL
)
4368 return TREE_OPERAND (addr
, 0);
4370 /* We couldn't figure out what was being called. */
4374 /* Print debugging information about the obstack O, named STR. */
4377 print_obstack_statistics (str
, o
)
4381 struct _obstack_chunk
*chunk
= o
->chunk
;
4385 n_alloc
+= o
->next_free
- chunk
->contents
;
4386 chunk
= chunk
->prev
;
4390 n_alloc
+= chunk
->limit
- &chunk
->contents
[0];
4391 chunk
= chunk
->prev
;
4393 fprintf (stderr
, "obstack %s: %u bytes, %d chunks\n",
4394 str
, n_alloc
, n_chunks
);
4397 /* Print debugging information about tree nodes generated during the compile,
4398 and any language-specific information. */
4401 dump_tree_statistics ()
4403 #ifdef GATHER_STATISTICS
4405 int total_nodes
, total_bytes
;
4408 fprintf (stderr
, "\n??? tree nodes created\n\n");
4409 #ifdef GATHER_STATISTICS
4410 fprintf (stderr
, "Kind Nodes Bytes\n");
4411 fprintf (stderr
, "-------------------------------------\n");
4412 total_nodes
= total_bytes
= 0;
4413 for (i
= 0; i
< (int) all_kinds
; i
++)
4415 fprintf (stderr
, "%-20s %6d %9d\n", tree_node_kind_names
[i
],
4416 tree_node_counts
[i
], tree_node_sizes
[i
]);
4417 total_nodes
+= tree_node_counts
[i
];
4418 total_bytes
+= tree_node_sizes
[i
];
4420 fprintf (stderr
, "-------------------------------------\n");
4421 fprintf (stderr
, "%-20s %6d %9d\n", "Total", total_nodes
, total_bytes
);
4422 fprintf (stderr
, "-------------------------------------\n");
4424 fprintf (stderr
, "(No per-node statistics)\n");
4426 print_obstack_statistics ("permanent_obstack", &permanent_obstack
);
4427 print_type_hash_statistics ();
4428 (*lang_hooks
.print_statistics
) ();
4431 #define FILE_FUNCTION_PREFIX_LEN 9
4433 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
4435 /* Appends 6 random characters to TEMPLATE to (hopefully) avoid name
4436 clashes in cases where we can't reliably choose a unique name.
4438 Derived from mkstemp.c in libiberty. */
4441 append_random_chars (template)
4444 static const char letters
[]
4445 = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
4446 static unsigned HOST_WIDE_INT value
;
4447 unsigned HOST_WIDE_INT v
;
4453 /* VALUE should be unique for each file and must
4454 not change between compiles since this can cause
4455 bootstrap comparison errors. */
4457 if (stat (main_input_filename
, &st
) < 0)
4460 value
= st
.st_dev
^ st
.st_ino
^ st
.st_mtime
;
4463 template += strlen (template);
4467 /* Fill in the random bits. */
4468 template[0] = letters
[v
% 62];
4470 template[1] = letters
[v
% 62];
4472 template[2] = letters
[v
% 62];
4474 template[3] = letters
[v
% 62];
4476 template[4] = letters
[v
% 62];
4478 template[5] = letters
[v
% 62];
4483 /* P is a string that will be used in a symbol. Mask out any characters
4484 that are not valid in that context. */
4487 clean_symbol_name (p
)
4492 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
4495 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
4502 /* Generate a name for a function unique to this translation unit.
4503 TYPE is some string to identify the purpose of this function to the
4504 linker or collect2. */
4507 get_file_function_name_long (type
)
4514 if (first_global_object_name
)
4515 p
= first_global_object_name
;
4518 /* We don't have anything that we know to be unique to this translation
4519 unit, so use what we do have and throw in some randomness. */
4521 const char *name
= weak_global_object_name
;
4522 const char *file
= main_input_filename
;
4527 file
= input_filename
;
4529 q
= (char *) alloca (7 + strlen (name
) + strlen (file
));
4531 sprintf (q
, "%s%s", name
, file
);
4532 append_random_chars (q
);
4536 buf
= (char *) alloca (sizeof (FILE_FUNCTION_FORMAT
) + strlen (p
)
4539 /* Set up the name of the file-level functions we may need.
4540 Use a global object (which is already required to be unique over
4541 the program) rather than the file name (which imposes extra
4543 sprintf (buf
, FILE_FUNCTION_FORMAT
, type
, p
);
4545 /* Don't need to pull weird characters out of global names. */
4546 if (p
!= first_global_object_name
)
4547 clean_symbol_name (buf
+ 11);
4549 return get_identifier (buf
);
4552 /* If KIND=='I', return a suitable global initializer (constructor) name.
4553 If KIND=='D', return a suitable global clean-up (destructor) name. */
4556 get_file_function_name (kind
)
4564 return get_file_function_name_long (p
);
4567 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
4568 The result is placed in BUFFER (which has length BIT_SIZE),
4569 with one bit in each char ('\000' or '\001').
4571 If the constructor is constant, NULL_TREE is returned.
4572 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
4575 get_set_constructor_bits (init
, buffer
, bit_size
)
4582 HOST_WIDE_INT domain_min
4583 = tree_low_cst (TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (init
))), 0);
4584 tree non_const_bits
= NULL_TREE
;
4586 for (i
= 0; i
< bit_size
; i
++)
4589 for (vals
= TREE_OPERAND (init
, 1);
4590 vals
!= NULL_TREE
; vals
= TREE_CHAIN (vals
))
4592 if (!host_integerp (TREE_VALUE (vals
), 0)
4593 || (TREE_PURPOSE (vals
) != NULL_TREE
4594 && !host_integerp (TREE_PURPOSE (vals
), 0)))
4596 = tree_cons (TREE_PURPOSE (vals
), TREE_VALUE (vals
), non_const_bits
);
4597 else if (TREE_PURPOSE (vals
) != NULL_TREE
)
4599 /* Set a range of bits to ones. */
4600 HOST_WIDE_INT lo_index
4601 = tree_low_cst (TREE_PURPOSE (vals
), 0) - domain_min
;
4602 HOST_WIDE_INT hi_index
4603 = tree_low_cst (TREE_VALUE (vals
), 0) - domain_min
;
4605 if (lo_index
< 0 || lo_index
>= bit_size
4606 || hi_index
< 0 || hi_index
>= bit_size
)
4608 for (; lo_index
<= hi_index
; lo_index
++)
4609 buffer
[lo_index
] = 1;
4613 /* Set a single bit to one. */
4615 = tree_low_cst (TREE_VALUE (vals
), 0) - domain_min
;
4616 if (index
< 0 || index
>= bit_size
)
4618 error ("invalid initializer for bit string");
4624 return non_const_bits
;
4627 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
4628 The result is placed in BUFFER (which is an array of bytes).
4629 If the constructor is constant, NULL_TREE is returned.
4630 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
4633 get_set_constructor_bytes (init
, buffer
, wd_size
)
4635 unsigned char *buffer
;
4639 int set_word_size
= BITS_PER_UNIT
;
4640 int bit_size
= wd_size
* set_word_size
;
4642 unsigned char *bytep
= buffer
;
4643 char *bit_buffer
= (char *) alloca (bit_size
);
4644 tree non_const_bits
= get_set_constructor_bits (init
, bit_buffer
, bit_size
);
4646 for (i
= 0; i
< wd_size
; i
++)
4649 for (i
= 0; i
< bit_size
; i
++)
4653 if (BYTES_BIG_ENDIAN
)
4654 *bytep
|= (1 << (set_word_size
- 1 - bit_pos
));
4656 *bytep
|= 1 << bit_pos
;
4659 if (bit_pos
>= set_word_size
)
4660 bit_pos
= 0, bytep
++;
4662 return non_const_bits
;
4665 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
4666 /* Complain that the tree code of NODE does not match the expected CODE.
4667 FILE, LINE, and FUNCTION are of the caller. */
4670 tree_check_failed (node
, code
, file
, line
, function
)
4672 enum tree_code code
;
4675 const char *function
;
4677 internal_error ("Tree check: expected %s, have %s in %s, at %s:%d",
4678 tree_code_name
[code
], tree_code_name
[TREE_CODE (node
)],
4679 function
, trim_filename (file
), line
);
4682 /* Similar to above, except that we check for a class of tree
4683 code, given in CL. */
4686 tree_class_check_failed (node
, cl
, file
, line
, function
)
4691 const char *function
;
4694 ("Tree check: expected class '%c', have '%c' (%s) in %s, at %s:%d",
4695 cl
, TREE_CODE_CLASS (TREE_CODE (node
)),
4696 tree_code_name
[TREE_CODE (node
)], function
, trim_filename (file
), line
);
4699 #endif /* ENABLE_TREE_CHECKING */
4701 /* For a new vector type node T, build the information necessary for
4702 debuggint output. */
4705 finish_vector_type (t
)
4711 tree index
= build_int_2 (TYPE_VECTOR_SUBPARTS (t
) - 1, 0);
4712 tree array
= build_array_type (TREE_TYPE (t
),
4713 build_index_type (index
));
4714 tree rt
= make_node (RECORD_TYPE
);
4716 TYPE_FIELDS (rt
) = build_decl (FIELD_DECL
, get_identifier ("f"), array
);
4717 DECL_CONTEXT (TYPE_FIELDS (rt
)) = rt
;
4719 TYPE_DEBUG_REPRESENTATION_TYPE (t
) = rt
;
4720 /* In dwarfout.c, type lookup uses TYPE_UID numbers. We want to output
4721 the representation type, and we want to find that die when looking up
4722 the vector type. This is most easily achieved by making the TYPE_UID
4724 TYPE_UID (rt
) = TYPE_UID (t
);
4728 /* Create nodes for all integer types (and error_mark_node) using the sizes
4729 of C datatypes. The caller should call set_sizetype soon after calling
4730 this function to select one of the types as sizetype. */
4733 build_common_tree_nodes (signed_char
)
4736 error_mark_node
= make_node (ERROR_MARK
);
4737 TREE_TYPE (error_mark_node
) = error_mark_node
;
4739 initialize_sizetypes ();
4741 /* Define both `signed char' and `unsigned char'. */
4742 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
4743 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
4745 /* Define `char', which is like either `signed char' or `unsigned char'
4746 but not the same as either. */
4749 ? make_signed_type (CHAR_TYPE_SIZE
)
4750 : make_unsigned_type (CHAR_TYPE_SIZE
));
4752 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
4753 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
4754 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
4755 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
4756 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
4757 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
4758 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
4759 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
4761 intQI_type_node
= make_signed_type (GET_MODE_BITSIZE (QImode
));
4762 intHI_type_node
= make_signed_type (GET_MODE_BITSIZE (HImode
));
4763 intSI_type_node
= make_signed_type (GET_MODE_BITSIZE (SImode
));
4764 intDI_type_node
= make_signed_type (GET_MODE_BITSIZE (DImode
));
4765 intTI_type_node
= make_signed_type (GET_MODE_BITSIZE (TImode
));
4767 unsigned_intQI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (QImode
));
4768 unsigned_intHI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (HImode
));
4769 unsigned_intSI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (SImode
));
4770 unsigned_intDI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (DImode
));
4771 unsigned_intTI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (TImode
));
4774 /* Call this function after calling build_common_tree_nodes and set_sizetype.
4775 It will create several other common tree nodes. */
4778 build_common_tree_nodes_2 (short_double
)
4781 /* Define these next since types below may used them. */
4782 integer_zero_node
= build_int_2 (0, 0);
4783 integer_one_node
= build_int_2 (1, 0);
4784 integer_minus_one_node
= build_int_2 (-1, -1);
4786 size_zero_node
= size_int (0);
4787 size_one_node
= size_int (1);
4788 bitsize_zero_node
= bitsize_int (0);
4789 bitsize_one_node
= bitsize_int (1);
4790 bitsize_unit_node
= bitsize_int (BITS_PER_UNIT
);
4792 void_type_node
= make_node (VOID_TYPE
);
4793 layout_type (void_type_node
);
4795 /* We are not going to have real types in C with less than byte alignment,
4796 so we might as well not have any types that claim to have it. */
4797 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
4798 TYPE_USER_ALIGN (void_type_node
) = 0;
4800 null_pointer_node
= build_int_2 (0, 0);
4801 TREE_TYPE (null_pointer_node
) = build_pointer_type (void_type_node
);
4802 layout_type (TREE_TYPE (null_pointer_node
));
4804 ptr_type_node
= build_pointer_type (void_type_node
);
4806 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
4808 float_type_node
= make_node (REAL_TYPE
);
4809 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
4810 layout_type (float_type_node
);
4812 double_type_node
= make_node (REAL_TYPE
);
4814 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
4816 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
4817 layout_type (double_type_node
);
4819 long_double_type_node
= make_node (REAL_TYPE
);
4820 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
4821 layout_type (long_double_type_node
);
4823 complex_integer_type_node
= make_node (COMPLEX_TYPE
);
4824 TREE_TYPE (complex_integer_type_node
) = integer_type_node
;
4825 layout_type (complex_integer_type_node
);
4827 complex_float_type_node
= make_node (COMPLEX_TYPE
);
4828 TREE_TYPE (complex_float_type_node
) = float_type_node
;
4829 layout_type (complex_float_type_node
);
4831 complex_double_type_node
= make_node (COMPLEX_TYPE
);
4832 TREE_TYPE (complex_double_type_node
) = double_type_node
;
4833 layout_type (complex_double_type_node
);
4835 complex_long_double_type_node
= make_node (COMPLEX_TYPE
);
4836 TREE_TYPE (complex_long_double_type_node
) = long_double_type_node
;
4837 layout_type (complex_long_double_type_node
);
4841 BUILD_VA_LIST_TYPE (t
);
4843 /* Many back-ends define record types without seting TYPE_NAME.
4844 If we copied the record type here, we'd keep the original
4845 record type without a name. This breaks name mangling. So,
4846 don't copy record types and let c_common_nodes_and_builtins()
4847 declare the type to be __builtin_va_list. */
4848 if (TREE_CODE (t
) != RECORD_TYPE
)
4849 t
= build_type_copy (t
);
4851 va_list_type_node
= t
;
4854 V4SF_type_node
= make_node (VECTOR_TYPE
);
4855 TREE_TYPE (V4SF_type_node
) = float_type_node
;
4856 TYPE_MODE (V4SF_type_node
) = V4SFmode
;
4857 finish_vector_type (V4SF_type_node
);
4859 V4SI_type_node
= make_node (VECTOR_TYPE
);
4860 TREE_TYPE (V4SI_type_node
) = intSI_type_node
;
4861 TYPE_MODE (V4SI_type_node
) = V4SImode
;
4862 finish_vector_type (V4SI_type_node
);
4864 V2SI_type_node
= make_node (VECTOR_TYPE
);
4865 TREE_TYPE (V2SI_type_node
) = intSI_type_node
;
4866 TYPE_MODE (V2SI_type_node
) = V2SImode
;
4867 finish_vector_type (V2SI_type_node
);
4869 V4HI_type_node
= make_node (VECTOR_TYPE
);
4870 TREE_TYPE (V4HI_type_node
) = intHI_type_node
;
4871 TYPE_MODE (V4HI_type_node
) = V4HImode
;
4872 finish_vector_type (V4HI_type_node
);
4874 V8QI_type_node
= make_node (VECTOR_TYPE
);
4875 TREE_TYPE (V8QI_type_node
) = intQI_type_node
;
4876 TYPE_MODE (V8QI_type_node
) = V8QImode
;
4877 finish_vector_type (V8QI_type_node
);
4879 V8HI_type_node
= make_node (VECTOR_TYPE
);
4880 TREE_TYPE (V8HI_type_node
) = intHI_type_node
;
4881 TYPE_MODE (V8HI_type_node
) = V8HImode
;
4882 finish_vector_type (V8HI_type_node
);
4884 V2SF_type_node
= make_node (VECTOR_TYPE
);
4885 TREE_TYPE (V2SF_type_node
) = float_type_node
;
4886 TYPE_MODE (V2SF_type_node
) = V2SFmode
;
4887 finish_vector_type (V2SF_type_node
);
4889 V16QI_type_node
= make_node (VECTOR_TYPE
);
4890 TREE_TYPE (V16QI_type_node
) = intQI_type_node
;
4891 TYPE_MODE (V16QI_type_node
) = V16QImode
;
4892 finish_vector_type (V16QI_type_node
);