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. */
49 #define obstack_chunk_alloc xmalloc
50 #define obstack_chunk_free free
51 /* obstack.[ch] explicitly declined to prototype this. */
52 extern int _obstack_allocated_p
PARAMS ((struct obstack
*h
, PTR obj
));
54 static void unsave_expr_now_r
PARAMS ((tree
));
56 /* Objects allocated on this obstack last forever. */
58 struct obstack permanent_obstack
;
60 /* Table indexed by tree code giving a string containing a character
61 classifying the tree code. Possibilities are
62 t, d, s, c, r, <, 1, 2 and e. See tree.def for details. */
64 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE,
66 char tree_code_type
[MAX_TREE_CODES
] = {
71 /* Table indexed by tree code giving number of expression
72 operands beyond the fixed part of the node structure.
73 Not used for types or decls. */
75 #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH,
77 int tree_code_length
[MAX_TREE_CODES
] = {
82 /* Names of tree components.
83 Used for printing out the tree and error messages. */
84 #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME,
86 const char *tree_code_name
[MAX_TREE_CODES
] = {
91 /* Statistics-gathering stuff. */
112 int tree_node_counts
[(int) all_kinds
];
113 int tree_node_sizes
[(int) all_kinds
];
114 int id_string_size
= 0;
116 static const char * const tree_node_kind_names
[] = {
134 /* Unique id for next decl created. */
135 static int next_decl_uid
;
136 /* Unique id for next type created. */
137 static int next_type_uid
= 1;
139 /* Since we cannot rehash a type after it is in the table, we have to
140 keep the hash code. */
148 /* Initial size of the hash table (rounded to next prime). */
149 #define TYPE_HASH_INITIAL_SIZE 1000
151 /* Now here is the hash table. When recording a type, it is added to
152 the slot whose index is the hash code. Note that the hash table is
153 used for several kinds of types (function types, array types and
154 array index range types, for now). While all these live in the
155 same table, they are completely independent, and the hash code is
156 computed differently for each of these. */
158 htab_t type_hash_table
;
160 static void build_real_from_int_cst_1
PARAMS ((PTR
));
161 static void set_type_quals
PARAMS ((tree
, int));
162 static void append_random_chars
PARAMS ((char *));
163 static void mark_type_hash
PARAMS ((void *));
164 static int type_hash_eq
PARAMS ((const void*, const void*));
165 static unsigned int type_hash_hash
PARAMS ((const void*));
166 static void print_type_hash_statistics
PARAMS((void));
167 static int mark_hash_entry
PARAMS((void **, void *));
168 static void finish_vector_type
PARAMS((tree
));
169 static int mark_tree_hashtable_entry
PARAMS((void **, void *));
171 /* If non-null, these are language-specific helper functions for
172 unsave_expr_now. If present, LANG_UNSAVE is called before its
173 argument (an UNSAVE_EXPR) is to be unsaved, and all other
174 processing in unsave_expr_now is aborted. LANG_UNSAVE_EXPR_NOW is
175 called from unsave_expr_1 for language-specific tree codes. */
176 void (*lang_unsave
) PARAMS ((tree
*));
177 void (*lang_unsave_expr_now
) PARAMS ((tree
));
179 /* If non-null, these are language-specific helper functions for
180 unsafe_for_reeval. Return negative to not handle some tree. */
181 int (*lang_unsafe_for_reeval
) PARAMS ((tree
));
183 /* Set the DECL_ASSEMBLER_NAME for a node. If it is the sort of thing
184 that the assembler should talk about, set DECL_ASSEMBLER_NAME to an
185 appropriate IDENTIFIER_NODE. Otherwise, set it to the
186 ERROR_MARK_NODE to ensure that the assembler does not talk about
188 void (*lang_set_decl_assembler_name
) PARAMS ((tree
));
190 tree global_trees
[TI_MAX
];
191 tree integer_types
[itk_none
];
193 /* Set the DECL_ASSEMBLER_NAME for DECL. */
195 set_decl_assembler_name (decl
)
198 /* The language-independent code should never use the
199 DECL_ASSEMBLER_NAME for lots of DECLs. Only FUNCTION_DECLs and
200 VAR_DECLs for variables with static storage duration need a real
201 DECL_ASSEMBLER_NAME. */
202 if (TREE_CODE (decl
) == FUNCTION_DECL
203 || (TREE_CODE (decl
) == VAR_DECL
204 && (TREE_STATIC (decl
)
205 || DECL_EXTERNAL (decl
)
206 || TREE_PUBLIC (decl
))))
207 /* By default, assume the name to use in assembly code is the
208 same as that used in the source language. (That's correct
209 for C, and GCC used to set DECL_ASSEMBLER_NAME to the same
210 value as DECL_NAME in build_decl, so this choice provides
211 backwards compatibility with existing front-ends. */
212 SET_DECL_ASSEMBLER_NAME (decl
, DECL_NAME (decl
));
214 /* Nobody should ever be asking for the DECL_ASSEMBLER_NAME of
215 these DECLs -- unless they're in language-dependent code, in
216 which case lang_set_decl_assembler_name should handle things. */
220 /* Init the principal obstacks. */
225 gcc_obstack_init (&permanent_obstack
);
227 /* Initialize the hash table of types. */
228 type_hash_table
= htab_create (TYPE_HASH_INITIAL_SIZE
, type_hash_hash
,
230 ggc_add_root (&type_hash_table
, 1, sizeof type_hash_table
, mark_type_hash
);
231 ggc_add_tree_root (global_trees
, TI_MAX
);
232 ggc_add_tree_root (integer_types
, itk_none
);
234 /* Set lang_set_decl_set_assembler_name to a default value. */
235 lang_set_decl_assembler_name
= set_decl_assembler_name
;
239 /* Allocate SIZE bytes in the permanent obstack
240 and return a pointer to them. */
246 return (char *) obstack_alloc (&permanent_obstack
, size
);
249 /* Allocate NELEM items of SIZE bytes in the permanent obstack
250 and return a pointer to them. The storage is cleared before
251 returning the value. */
254 perm_calloc (nelem
, size
)
258 char *rval
= (char *) obstack_alloc (&permanent_obstack
, nelem
* size
);
259 memset (rval
, 0, nelem
* size
);
263 /* Compute the number of bytes occupied by 'node'. This routine only
264 looks at TREE_CODE and, if the code is TREE_VEC, TREE_VEC_LENGTH. */
269 enum tree_code code
= TREE_CODE (node
);
271 switch (TREE_CODE_CLASS (code
))
273 case 'd': /* A decl node */
274 return sizeof (struct tree_decl
);
276 case 't': /* a type node */
277 return sizeof (struct tree_type
);
279 case 'b': /* a lexical block node */
280 return sizeof (struct tree_block
);
282 case 'r': /* a reference */
283 case 'e': /* an expression */
284 case 's': /* an expression with side effects */
285 case '<': /* a comparison expression */
286 case '1': /* a unary arithmetic expression */
287 case '2': /* a binary arithmetic expression */
288 return (sizeof (struct tree_exp
)
289 + (TREE_CODE_LENGTH (code
) - 1) * sizeof (char *));
291 case 'c': /* a constant */
292 /* We can't use TREE_CODE_LENGTH for INTEGER_CST, since the number of
293 words is machine-dependent due to varying length of HOST_WIDE_INT,
294 which might be wider than a pointer (e.g., long long). Similarly
295 for REAL_CST, since the number of words is machine-dependent due
296 to varying size and alignment of `double'. */
297 if (code
== INTEGER_CST
)
298 return sizeof (struct tree_int_cst
);
299 else if (code
== REAL_CST
)
300 return sizeof (struct tree_real_cst
);
302 return (sizeof (struct tree_common
)
303 + TREE_CODE_LENGTH (code
) * sizeof (char *));
305 case 'x': /* something random, like an identifier. */
308 length
= (sizeof (struct tree_common
)
309 + TREE_CODE_LENGTH (code
) * sizeof (char *));
310 if (code
== TREE_VEC
)
311 length
+= (TREE_VEC_LENGTH (node
) - 1) * sizeof (char *);
320 /* Return a newly allocated node of code CODE.
321 For decl and type nodes, some other fields are initialized.
322 The rest of the node is initialized to zero.
324 Achoo! I got a code in the node. */
331 register int type
= TREE_CODE_CLASS (code
);
332 register size_t length
;
333 #ifdef GATHER_STATISTICS
334 register tree_node_kind kind
;
336 struct tree_common ttmp
;
338 /* We can't allocate a TREE_VEC without knowing how many elements
340 if (code
== TREE_VEC
)
343 TREE_SET_CODE ((tree
)&ttmp
, code
);
344 length
= tree_size ((tree
)&ttmp
);
346 #ifdef GATHER_STATISTICS
349 case 'd': /* A decl node */
353 case 't': /* a type node */
357 case 'b': /* a lexical block */
361 case 's': /* an expression with side effects */
365 case 'r': /* a reference */
369 case 'e': /* an expression */
370 case '<': /* a comparison expression */
371 case '1': /* a unary arithmetic expression */
372 case '2': /* a binary arithmetic expression */
376 case 'c': /* a constant */
380 case 'x': /* something random, like an identifier. */
381 if (code
== IDENTIFIER_NODE
)
383 else if (code
== OP_IDENTIFIER
)
385 else if (code
== TREE_VEC
)
395 tree_node_counts
[(int) kind
]++;
396 tree_node_sizes
[(int) kind
] += length
;
399 t
= ggc_alloc_tree (length
);
401 memset ((PTR
) t
, 0, length
);
403 TREE_SET_CODE (t
, code
);
408 TREE_SIDE_EFFECTS (t
) = 1;
409 TREE_TYPE (t
) = void_type_node
;
413 if (code
!= FUNCTION_DECL
)
415 DECL_USER_ALIGN (t
) = 0;
416 DECL_IN_SYSTEM_HEADER (t
) = in_system_header
;
417 DECL_SOURCE_LINE (t
) = lineno
;
418 DECL_SOURCE_FILE (t
) =
419 (input_filename
) ? input_filename
: "<built-in>";
420 DECL_UID (t
) = next_decl_uid
++;
422 /* We have not yet computed the alias set for this declaration. */
423 DECL_POINTER_ALIAS_SET (t
) = -1;
427 TYPE_UID (t
) = next_type_uid
++;
428 TYPE_ALIGN (t
) = char_type_node
? TYPE_ALIGN (char_type_node
) : 0;
429 TYPE_USER_ALIGN (t
) = 0;
430 TYPE_MAIN_VARIANT (t
) = t
;
432 /* Default to no attributes for type, but let target change that. */
433 TYPE_ATTRIBUTES (t
) = NULL_TREE
;
434 (*targetm
.set_default_type_attributes
) (t
);
436 /* We have not yet computed the alias set for this type. */
437 TYPE_ALIAS_SET (t
) = -1;
441 TREE_CONSTANT (t
) = 1;
451 case PREDECREMENT_EXPR
:
452 case PREINCREMENT_EXPR
:
453 case POSTDECREMENT_EXPR
:
454 case POSTINCREMENT_EXPR
:
455 /* All of these have side-effects, no matter what their
457 TREE_SIDE_EFFECTS (t
) = 1;
469 /* A front-end can reset this to an appropriate function if types need
472 tree (*make_lang_type_fn
) PARAMS ((enum tree_code
)) = make_node
;
474 /* Return a new type (with the indicated CODE), doing whatever
475 language-specific processing is required. */
478 make_lang_type (code
)
481 return (*make_lang_type_fn
) (code
);
484 /* Return a new node with the same contents as NODE except that its
485 TREE_CHAIN is zero and it has a fresh uid. */
492 register enum tree_code code
= TREE_CODE (node
);
493 register size_t length
;
495 length
= tree_size (node
);
496 t
= ggc_alloc_tree (length
);
497 memcpy (t
, node
, length
);
500 TREE_ASM_WRITTEN (t
) = 0;
502 if (TREE_CODE_CLASS (code
) == 'd')
503 DECL_UID (t
) = next_decl_uid
++;
504 else if (TREE_CODE_CLASS (code
) == 't')
506 TYPE_UID (t
) = next_type_uid
++;
507 /* The following is so that the debug code for
508 the copy is different from the original type.
509 The two statements usually duplicate each other
510 (because they clear fields of the same union),
511 but the optimizer should catch that. */
512 TYPE_SYMTAB_POINTER (t
) = 0;
513 TYPE_SYMTAB_ADDRESS (t
) = 0;
519 /* Return a copy of a chain of nodes, chained through the TREE_CHAIN field.
520 For example, this can copy a list made of TREE_LIST nodes. */
527 register tree prev
, next
;
532 head
= prev
= copy_node (list
);
533 next
= TREE_CHAIN (list
);
536 TREE_CHAIN (prev
) = copy_node (next
);
537 prev
= TREE_CHAIN (prev
);
538 next
= TREE_CHAIN (next
);
544 /* Return a newly constructed INTEGER_CST node whose constant value
545 is specified by the two ints LOW and HI.
546 The TREE_TYPE is set to `int'.
548 This function should be used via the `build_int_2' macro. */
551 build_int_2_wide (low
, hi
)
552 unsigned HOST_WIDE_INT low
;
555 register tree t
= make_node (INTEGER_CST
);
557 TREE_INT_CST_LOW (t
) = low
;
558 TREE_INT_CST_HIGH (t
) = hi
;
559 TREE_TYPE (t
) = integer_type_node
;
563 /* Return a new REAL_CST node whose type is TYPE and value is D. */
573 /* Check for valid float value for this type on this target machine;
574 if not, can print error message and store a valid value in D. */
575 #ifdef CHECK_FLOAT_VALUE
576 CHECK_FLOAT_VALUE (TYPE_MODE (type
), d
, overflow
);
579 v
= make_node (REAL_CST
);
580 TREE_TYPE (v
) = type
;
581 TREE_REAL_CST (v
) = d
;
582 TREE_OVERFLOW (v
) = TREE_CONSTANT_OVERFLOW (v
) = overflow
;
586 /* Return a new REAL_CST node whose type is TYPE
587 and whose value is the integer value of the INTEGER_CST node I. */
589 #if !defined (REAL_IS_NOT_DOUBLE) || defined (REAL_ARITHMETIC)
592 real_value_from_int_cst (type
, i
)
593 tree type ATTRIBUTE_UNUSED
, i
;
597 #ifdef REAL_ARITHMETIC
598 /* Clear all bits of the real value type so that we can later do
599 bitwise comparisons to see if two values are the same. */
600 memset ((char *) &d
, 0, sizeof d
);
602 if (! TREE_UNSIGNED (TREE_TYPE (i
)))
603 REAL_VALUE_FROM_INT (d
, TREE_INT_CST_LOW (i
), TREE_INT_CST_HIGH (i
),
606 REAL_VALUE_FROM_UNSIGNED_INT (d
, TREE_INT_CST_LOW (i
),
607 TREE_INT_CST_HIGH (i
), TYPE_MODE (type
));
608 #else /* not REAL_ARITHMETIC */
609 /* Some 386 compilers mishandle unsigned int to float conversions,
610 so introduce a temporary variable E to avoid those bugs. */
611 if (TREE_INT_CST_HIGH (i
) < 0 && ! TREE_UNSIGNED (TREE_TYPE (i
)))
615 d
= (double) (~TREE_INT_CST_HIGH (i
));
616 e
= ((double) ((HOST_WIDE_INT
) 1 << (HOST_BITS_PER_WIDE_INT
/ 2))
617 * (double) ((HOST_WIDE_INT
) 1 << (HOST_BITS_PER_WIDE_INT
/ 2)));
619 e
= (double) (~TREE_INT_CST_LOW (i
));
627 d
= (double) (unsigned HOST_WIDE_INT
) TREE_INT_CST_HIGH (i
);
628 e
= ((double) ((HOST_WIDE_INT
) 1 << (HOST_BITS_PER_WIDE_INT
/ 2))
629 * (double) ((HOST_WIDE_INT
) 1 << (HOST_BITS_PER_WIDE_INT
/ 2)));
631 e
= (double) TREE_INT_CST_LOW (i
);
634 #endif /* not REAL_ARITHMETIC */
638 /* Args to pass to and from build_real_from_int_cst_1. */
642 tree type
; /* Input: type to conver to. */
643 tree i
; /* Input: operand to convert. */
644 REAL_VALUE_TYPE d
; /* Output: floating point value. */
647 /* Convert an integer to a floating point value while protected by a floating
648 point exception handler. */
651 build_real_from_int_cst_1 (data
)
654 struct brfic_args
*args
= (struct brfic_args
*) data
;
656 #ifdef REAL_ARITHMETIC
657 args
->d
= real_value_from_int_cst (args
->type
, args
->i
);
660 = REAL_VALUE_TRUNCATE (TYPE_MODE (args
->type
),
661 real_value_from_int_cst (args
->type
, args
->i
));
665 /* Given a tree representing an integer constant I, return a tree
666 representing the same value as a floating-point constant of type TYPE.
667 We cannot perform this operation if there is no way of doing arithmetic
668 on floating-point values. */
671 build_real_from_int_cst (type
, i
)
676 int overflow
= TREE_OVERFLOW (i
);
678 struct brfic_args args
;
680 v
= make_node (REAL_CST
);
681 TREE_TYPE (v
) = type
;
683 /* Setup input for build_real_from_int_cst_1() */
687 if (do_float_handler (build_real_from_int_cst_1
, (PTR
) &args
))
688 /* Receive output from build_real_from_int_cst_1() */
692 /* We got an exception from build_real_from_int_cst_1() */
697 /* Check for valid float value for this type on this target machine. */
699 #ifdef CHECK_FLOAT_VALUE
700 CHECK_FLOAT_VALUE (TYPE_MODE (type
), d
, overflow
);
703 TREE_REAL_CST (v
) = d
;
704 TREE_OVERFLOW (v
) = TREE_CONSTANT_OVERFLOW (v
) = overflow
;
708 #endif /* not REAL_IS_NOT_DOUBLE, or REAL_ARITHMETIC */
710 /* Return a newly constructed STRING_CST node whose value is
711 the LEN characters at STR.
712 The TREE_TYPE is not initialized. */
715 build_string (len
, str
)
719 register tree s
= make_node (STRING_CST
);
721 TREE_STRING_LENGTH (s
) = len
;
722 TREE_STRING_POINTER (s
) = ggc_alloc_string (str
, len
);
727 /* Return a newly constructed COMPLEX_CST node whose value is
728 specified by the real and imaginary parts REAL and IMAG.
729 Both REAL and IMAG should be constant nodes. TYPE, if specified,
730 will be the type of the COMPLEX_CST; otherwise a new type will be made. */
733 build_complex (type
, real
, imag
)
737 register tree t
= make_node (COMPLEX_CST
);
739 TREE_REALPART (t
) = real
;
740 TREE_IMAGPART (t
) = imag
;
741 TREE_TYPE (t
) = type
? type
: build_complex_type (TREE_TYPE (real
));
742 TREE_OVERFLOW (t
) = TREE_OVERFLOW (real
) | TREE_OVERFLOW (imag
);
743 TREE_CONSTANT_OVERFLOW (t
)
744 = TREE_CONSTANT_OVERFLOW (real
) | TREE_CONSTANT_OVERFLOW (imag
);
748 /* Build a newly constructed TREE_VEC node of length LEN. */
755 register int length
= (len
-1) * sizeof (tree
) + sizeof (struct tree_vec
);
757 #ifdef GATHER_STATISTICS
758 tree_node_counts
[(int)vec_kind
]++;
759 tree_node_sizes
[(int)vec_kind
] += length
;
762 t
= ggc_alloc_tree (length
);
764 memset ((PTR
) t
, 0, length
);
765 TREE_SET_CODE (t
, TREE_VEC
);
766 TREE_VEC_LENGTH (t
) = len
;
771 /* Return 1 if EXPR is the integer constant zero or a complex constant
780 return ((TREE_CODE (expr
) == INTEGER_CST
781 && ! TREE_CONSTANT_OVERFLOW (expr
)
782 && TREE_INT_CST_LOW (expr
) == 0
783 && TREE_INT_CST_HIGH (expr
) == 0)
784 || (TREE_CODE (expr
) == COMPLEX_CST
785 && integer_zerop (TREE_REALPART (expr
))
786 && integer_zerop (TREE_IMAGPART (expr
))));
789 /* Return 1 if EXPR is the integer constant one or the corresponding
798 return ((TREE_CODE (expr
) == INTEGER_CST
799 && ! TREE_CONSTANT_OVERFLOW (expr
)
800 && TREE_INT_CST_LOW (expr
) == 1
801 && TREE_INT_CST_HIGH (expr
) == 0)
802 || (TREE_CODE (expr
) == COMPLEX_CST
803 && integer_onep (TREE_REALPART (expr
))
804 && integer_zerop (TREE_IMAGPART (expr
))));
807 /* Return 1 if EXPR is an integer containing all 1's in as much precision as
808 it contains. Likewise for the corresponding complex constant. */
811 integer_all_onesp (expr
)
819 if (TREE_CODE (expr
) == COMPLEX_CST
820 && integer_all_onesp (TREE_REALPART (expr
))
821 && integer_zerop (TREE_IMAGPART (expr
)))
824 else if (TREE_CODE (expr
) != INTEGER_CST
825 || TREE_CONSTANT_OVERFLOW (expr
))
828 uns
= TREE_UNSIGNED (TREE_TYPE (expr
));
830 return (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
831 && TREE_INT_CST_HIGH (expr
) == -1);
833 /* Note that using TYPE_PRECISION here is wrong. We care about the
834 actual bits, not the (arbitrary) range of the type. */
835 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (expr
)));
836 if (prec
>= HOST_BITS_PER_WIDE_INT
)
838 HOST_WIDE_INT high_value
;
841 shift_amount
= prec
- HOST_BITS_PER_WIDE_INT
;
843 if (shift_amount
> HOST_BITS_PER_WIDE_INT
)
844 /* Can not handle precisions greater than twice the host int size. */
846 else if (shift_amount
== HOST_BITS_PER_WIDE_INT
)
847 /* Shifting by the host word size is undefined according to the ANSI
848 standard, so we must handle this as a special case. */
851 high_value
= ((HOST_WIDE_INT
) 1 << shift_amount
) - 1;
853 return (TREE_INT_CST_LOW (expr
) == ~(unsigned HOST_WIDE_INT
) 0
854 && TREE_INT_CST_HIGH (expr
) == high_value
);
857 return TREE_INT_CST_LOW (expr
) == ((unsigned HOST_WIDE_INT
) 1 << prec
) - 1;
860 /* Return 1 if EXPR is an integer constant that is a power of 2 (i.e., has only
868 HOST_WIDE_INT high
, low
;
872 if (TREE_CODE (expr
) == COMPLEX_CST
873 && integer_pow2p (TREE_REALPART (expr
))
874 && integer_zerop (TREE_IMAGPART (expr
)))
877 if (TREE_CODE (expr
) != INTEGER_CST
|| TREE_CONSTANT_OVERFLOW (expr
))
880 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
881 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
882 high
= TREE_INT_CST_HIGH (expr
);
883 low
= TREE_INT_CST_LOW (expr
);
885 /* First clear all bits that are beyond the type's precision in case
886 we've been sign extended. */
888 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
890 else if (prec
> HOST_BITS_PER_WIDE_INT
)
891 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
895 if (prec
< HOST_BITS_PER_WIDE_INT
)
896 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
899 if (high
== 0 && low
== 0)
902 return ((high
== 0 && (low
& (low
- 1)) == 0)
903 || (low
== 0 && (high
& (high
- 1)) == 0));
906 /* Return the power of two represented by a tree node known to be a
914 HOST_WIDE_INT high
, low
;
918 if (TREE_CODE (expr
) == COMPLEX_CST
)
919 return tree_log2 (TREE_REALPART (expr
));
921 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
922 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
924 high
= TREE_INT_CST_HIGH (expr
);
925 low
= TREE_INT_CST_LOW (expr
);
927 /* First clear all bits that are beyond the type's precision in case
928 we've been sign extended. */
930 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
)
932 else if (prec
> HOST_BITS_PER_WIDE_INT
)
933 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
937 if (prec
< HOST_BITS_PER_WIDE_INT
)
938 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
941 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ exact_log2 (high
)
945 /* Similar, but return the largest integer Y such that 2 ** Y is less
946 than or equal to EXPR. */
949 tree_floor_log2 (expr
)
953 HOST_WIDE_INT high
, low
;
957 if (TREE_CODE (expr
) == COMPLEX_CST
)
958 return tree_log2 (TREE_REALPART (expr
));
960 prec
= (POINTER_TYPE_P (TREE_TYPE (expr
))
961 ? POINTER_SIZE
: TYPE_PRECISION (TREE_TYPE (expr
)));
963 high
= TREE_INT_CST_HIGH (expr
);
964 low
= TREE_INT_CST_LOW (expr
);
966 /* First clear all bits that are beyond the type's precision in case
967 we've been sign extended. Ignore if type's precision hasn't been set
968 since what we are doing is setting it. */
970 if (prec
== 2 * HOST_BITS_PER_WIDE_INT
|| prec
== 0)
972 else if (prec
> HOST_BITS_PER_WIDE_INT
)
973 high
&= ~((HOST_WIDE_INT
) (-1) << (prec
- HOST_BITS_PER_WIDE_INT
));
977 if (prec
< HOST_BITS_PER_WIDE_INT
)
978 low
&= ~((HOST_WIDE_INT
) (-1) << prec
);
981 return (high
!= 0 ? HOST_BITS_PER_WIDE_INT
+ floor_log2 (high
)
985 /* Return 1 if EXPR is the real constant zero. */
993 return ((TREE_CODE (expr
) == REAL_CST
994 && ! TREE_CONSTANT_OVERFLOW (expr
)
995 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst0
))
996 || (TREE_CODE (expr
) == COMPLEX_CST
997 && real_zerop (TREE_REALPART (expr
))
998 && real_zerop (TREE_IMAGPART (expr
))));
1001 /* Return 1 if EXPR is the real constant one in real or complex form. */
1009 return ((TREE_CODE (expr
) == REAL_CST
1010 && ! TREE_CONSTANT_OVERFLOW (expr
)
1011 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst1
))
1012 || (TREE_CODE (expr
) == COMPLEX_CST
1013 && real_onep (TREE_REALPART (expr
))
1014 && real_zerop (TREE_IMAGPART (expr
))));
1017 /* Return 1 if EXPR is the real constant two. */
1025 return ((TREE_CODE (expr
) == REAL_CST
1026 && ! TREE_CONSTANT_OVERFLOW (expr
)
1027 && REAL_VALUES_EQUAL (TREE_REAL_CST (expr
), dconst2
))
1028 || (TREE_CODE (expr
) == COMPLEX_CST
1029 && real_twop (TREE_REALPART (expr
))
1030 && real_zerop (TREE_IMAGPART (expr
))));
1033 /* Nonzero if EXP is a constant or a cast of a constant. */
1036 really_constant_p (exp
)
1039 /* This is not quite the same as STRIP_NOPS. It does more. */
1040 while (TREE_CODE (exp
) == NOP_EXPR
1041 || TREE_CODE (exp
) == CONVERT_EXPR
1042 || TREE_CODE (exp
) == NON_LVALUE_EXPR
)
1043 exp
= TREE_OPERAND (exp
, 0);
1044 return TREE_CONSTANT (exp
);
1047 /* Return first list element whose TREE_VALUE is ELEM.
1048 Return 0 if ELEM is not in LIST. */
1051 value_member (elem
, list
)
1056 if (elem
== TREE_VALUE (list
))
1058 list
= TREE_CHAIN (list
);
1063 /* Return first list element whose TREE_PURPOSE is ELEM.
1064 Return 0 if ELEM is not in LIST. */
1067 purpose_member (elem
, list
)
1072 if (elem
== TREE_PURPOSE (list
))
1074 list
= TREE_CHAIN (list
);
1079 /* Return first list element whose BINFO_TYPE is ELEM.
1080 Return 0 if ELEM is not in LIST. */
1083 binfo_member (elem
, list
)
1088 if (elem
== BINFO_TYPE (list
))
1090 list
= TREE_CHAIN (list
);
1095 /* Return nonzero if ELEM is part of the chain CHAIN. */
1098 chain_member (elem
, chain
)
1105 chain
= TREE_CHAIN (chain
);
1111 /* Return nonzero if ELEM is equal to TREE_VALUE (CHAIN) for any piece of
1112 chain CHAIN. This and the next function are currently unused, but
1113 are retained for completeness. */
1116 chain_member_value (elem
, chain
)
1121 if (elem
== TREE_VALUE (chain
))
1123 chain
= TREE_CHAIN (chain
);
1129 /* Return nonzero if ELEM is equal to TREE_PURPOSE (CHAIN)
1130 for any piece of chain CHAIN. */
1133 chain_member_purpose (elem
, chain
)
1138 if (elem
== TREE_PURPOSE (chain
))
1140 chain
= TREE_CHAIN (chain
);
1146 /* Return the length of a chain of nodes chained through TREE_CHAIN.
1147 We expect a null pointer to mark the end of the chain.
1148 This is the Lisp primitive `length'. */
1155 register int len
= 0;
1157 for (tail
= t
; tail
; tail
= TREE_CHAIN (tail
))
1163 /* Returns the number of FIELD_DECLs in TYPE. */
1166 fields_length (type
)
1169 tree t
= TYPE_FIELDS (type
);
1172 for (; t
; t
= TREE_CHAIN (t
))
1173 if (TREE_CODE (t
) == FIELD_DECL
)
1179 /* Concatenate two chains of nodes (chained through TREE_CHAIN)
1180 by modifying the last node in chain 1 to point to chain 2.
1181 This is the Lisp primitive `nconc'. */
1191 #ifdef ENABLE_TREE_CHECKING
1195 for (t1
= op1
; TREE_CHAIN (t1
); t1
= TREE_CHAIN (t1
))
1197 TREE_CHAIN (t1
) = op2
;
1198 #ifdef ENABLE_TREE_CHECKING
1199 for (t2
= op2
; t2
; t2
= TREE_CHAIN (t2
))
1201 abort (); /* Circularity created. */
1209 /* Return the last node in a chain of nodes (chained through TREE_CHAIN). */
1213 register tree chain
;
1217 while ((next
= TREE_CHAIN (chain
)))
1222 /* Reverse the order of elements in the chain T,
1223 and return the new head of the chain (old last element). */
1229 register tree prev
= 0, decl
, next
;
1230 for (decl
= t
; decl
; decl
= next
)
1232 next
= TREE_CHAIN (decl
);
1233 TREE_CHAIN (decl
) = prev
;
1239 /* Given a chain CHAIN of tree nodes,
1240 construct and return a list of those nodes. */
1246 tree result
= NULL_TREE
;
1247 tree in_tail
= chain
;
1248 tree out_tail
= NULL_TREE
;
1252 tree next
= tree_cons (NULL_TREE
, in_tail
, NULL_TREE
);
1254 TREE_CHAIN (out_tail
) = next
;
1258 in_tail
= TREE_CHAIN (in_tail
);
1264 /* Return a newly created TREE_LIST node whose
1265 purpose and value fields are PARM and VALUE. */
1268 build_tree_list (parm
, value
)
1271 register tree t
= make_node (TREE_LIST
);
1272 TREE_PURPOSE (t
) = parm
;
1273 TREE_VALUE (t
) = value
;
1277 /* Return a newly created TREE_LIST node whose
1278 purpose and value fields are PARM and VALUE
1279 and whose TREE_CHAIN is CHAIN. */
1282 tree_cons (purpose
, value
, chain
)
1283 tree purpose
, value
, chain
;
1287 node
= ggc_alloc_tree (sizeof (struct tree_list
));
1289 memset (node
, 0, sizeof (struct tree_common
));
1291 #ifdef GATHER_STATISTICS
1292 tree_node_counts
[(int) x_kind
]++;
1293 tree_node_sizes
[(int) x_kind
] += sizeof (struct tree_list
);
1296 TREE_SET_CODE (node
, TREE_LIST
);
1297 TREE_CHAIN (node
) = chain
;
1298 TREE_PURPOSE (node
) = purpose
;
1299 TREE_VALUE (node
) = value
;
1304 /* Return the size nominally occupied by an object of type TYPE
1305 when it resides in memory. The value is measured in units of bytes,
1306 and its data type is that normally used for type sizes
1307 (which is the first type created by make_signed_type or
1308 make_unsigned_type). */
1311 size_in_bytes (type
)
1316 if (type
== error_mark_node
)
1317 return integer_zero_node
;
1319 type
= TYPE_MAIN_VARIANT (type
);
1320 t
= TYPE_SIZE_UNIT (type
);
1324 incomplete_type_error (NULL_TREE
, type
);
1325 return size_zero_node
;
1328 if (TREE_CODE (t
) == INTEGER_CST
)
1329 force_fit_type (t
, 0);
1334 /* Return the size of TYPE (in bytes) as a wide integer
1335 or return -1 if the size can vary or is larger than an integer. */
1338 int_size_in_bytes (type
)
1343 if (type
== error_mark_node
)
1346 type
= TYPE_MAIN_VARIANT (type
);
1347 t
= TYPE_SIZE_UNIT (type
);
1349 || TREE_CODE (t
) != INTEGER_CST
1350 || TREE_OVERFLOW (t
)
1351 || TREE_INT_CST_HIGH (t
) != 0
1352 /* If the result would appear negative, it's too big to represent. */
1353 || (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0)
1356 return TREE_INT_CST_LOW (t
);
1359 /* Return the bit position of FIELD, in bits from the start of the record.
1360 This is a tree of type bitsizetype. */
1363 bit_position (field
)
1367 return bit_from_pos (DECL_FIELD_OFFSET (field
),
1368 DECL_FIELD_BIT_OFFSET (field
));
1371 /* Likewise, but return as an integer. Abort if it cannot be represented
1372 in that way (since it could be a signed value, we don't have the option
1373 of returning -1 like int_size_in_byte can. */
1376 int_bit_position (field
)
1379 return tree_low_cst (bit_position (field
), 0);
1382 /* Return the byte position of FIELD, in bytes from the start of the record.
1383 This is a tree of type sizetype. */
1386 byte_position (field
)
1389 return byte_from_pos (DECL_FIELD_OFFSET (field
),
1390 DECL_FIELD_BIT_OFFSET (field
));
1393 /* Likewise, but return as an integer. Abort if it cannot be represented
1394 in that way (since it could be a signed value, we don't have the option
1395 of returning -1 like int_size_in_byte can. */
1398 int_byte_position (field
)
1401 return tree_low_cst (byte_position (field
), 0);
1404 /* Return the strictest alignment, in bits, that T is known to have. */
1410 unsigned int align0
, align1
;
1412 switch (TREE_CODE (t
))
1414 case NOP_EXPR
: case CONVERT_EXPR
: case NON_LVALUE_EXPR
:
1415 /* If we have conversions, we know that the alignment of the
1416 object must meet each of the alignments of the types. */
1417 align0
= expr_align (TREE_OPERAND (t
, 0));
1418 align1
= TYPE_ALIGN (TREE_TYPE (t
));
1419 return MAX (align0
, align1
);
1421 case SAVE_EXPR
: case COMPOUND_EXPR
: case MODIFY_EXPR
:
1422 case INIT_EXPR
: case TARGET_EXPR
: case WITH_CLEANUP_EXPR
:
1423 case WITH_RECORD_EXPR
: case CLEANUP_POINT_EXPR
: case UNSAVE_EXPR
:
1424 /* These don't change the alignment of an object. */
1425 return expr_align (TREE_OPERAND (t
, 0));
1428 /* The best we can do is say that the alignment is the least aligned
1430 align0
= expr_align (TREE_OPERAND (t
, 1));
1431 align1
= expr_align (TREE_OPERAND (t
, 2));
1432 return MIN (align0
, align1
);
1434 case LABEL_DECL
: case CONST_DECL
:
1435 case VAR_DECL
: case PARM_DECL
: case RESULT_DECL
:
1436 if (DECL_ALIGN (t
) != 0)
1437 return DECL_ALIGN (t
);
1441 return FUNCTION_BOUNDARY
;
1447 /* Otherwise take the alignment from that of the type. */
1448 return TYPE_ALIGN (TREE_TYPE (t
));
1451 /* Return, as a tree node, the number of elements for TYPE (which is an
1452 ARRAY_TYPE) minus one. This counts only elements of the top array. */
1455 array_type_nelts (type
)
1458 tree index_type
, min
, max
;
1460 /* If they did it with unspecified bounds, then we should have already
1461 given an error about it before we got here. */
1462 if (! TYPE_DOMAIN (type
))
1463 return error_mark_node
;
1465 index_type
= TYPE_DOMAIN (type
);
1466 min
= TYPE_MIN_VALUE (index_type
);
1467 max
= TYPE_MAX_VALUE (index_type
);
1469 return (integer_zerop (min
)
1471 : fold (build (MINUS_EXPR
, TREE_TYPE (max
), max
, min
)));
1474 /* Return nonzero if arg is static -- a reference to an object in
1475 static storage. This is not the same as the C meaning of `static'. */
1481 switch (TREE_CODE (arg
))
1484 /* Nested functions aren't static, since taking their address
1485 involves a trampoline. */
1486 return (decl_function_context (arg
) == 0 || DECL_NO_STATIC_CHAIN (arg
))
1487 && ! DECL_NON_ADDR_CONST_P (arg
);
1490 return (TREE_STATIC (arg
) || DECL_EXTERNAL (arg
))
1491 && ! DECL_NON_ADDR_CONST_P (arg
);
1494 return TREE_STATIC (arg
);
1500 /* If we are referencing a bitfield, we can't evaluate an
1501 ADDR_EXPR at compile time and so it isn't a constant. */
1503 return (! DECL_BIT_FIELD (TREE_OPERAND (arg
, 1))
1504 && staticp (TREE_OPERAND (arg
, 0)));
1510 /* This case is technically correct, but results in setting
1511 TREE_CONSTANT on ADDR_EXPRs that cannot be evaluated at
1514 return TREE_CONSTANT (TREE_OPERAND (arg
, 0));
1518 case ARRAY_RANGE_REF
:
1519 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (arg
))) == INTEGER_CST
1520 && TREE_CODE (TREE_OPERAND (arg
, 1)) == INTEGER_CST
)
1521 return staticp (TREE_OPERAND (arg
, 0));
1528 /* Wrap a SAVE_EXPR around EXPR, if appropriate.
1529 Do this to any expression which may be used in more than one place,
1530 but must be evaluated only once.
1532 Normally, expand_expr would reevaluate the expression each time.
1533 Calling save_expr produces something that is evaluated and recorded
1534 the first time expand_expr is called on it. Subsequent calls to
1535 expand_expr just reuse the recorded value.
1537 The call to expand_expr that generates code that actually computes
1538 the value is the first call *at compile time*. Subsequent calls
1539 *at compile time* generate code to use the saved value.
1540 This produces correct result provided that *at run time* control
1541 always flows through the insns made by the first expand_expr
1542 before reaching the other places where the save_expr was evaluated.
1543 You, the caller of save_expr, must make sure this is so.
1545 Constants, and certain read-only nodes, are returned with no
1546 SAVE_EXPR because that is safe. Expressions containing placeholders
1547 are not touched; see tree.def for an explanation of what these
1554 register tree t
= fold (expr
);
1556 /* We don't care about whether this can be used as an lvalue in this
1558 while (TREE_CODE (t
) == NON_LVALUE_EXPR
)
1559 t
= TREE_OPERAND (t
, 0);
1561 /* If the tree evaluates to a constant, then we don't want to hide that
1562 fact (i.e. this allows further folding, and direct checks for constants).
1563 However, a read-only object that has side effects cannot be bypassed.
1564 Since it is no problem to reevaluate literals, we just return the
1567 if (TREE_CONSTANT (t
) || (TREE_READONLY (t
) && ! TREE_SIDE_EFFECTS (t
))
1568 || TREE_CODE (t
) == SAVE_EXPR
|| TREE_CODE (t
) == ERROR_MARK
)
1571 /* If T contains a PLACEHOLDER_EXPR, we must evaluate it each time, since
1572 it means that the size or offset of some field of an object depends on
1573 the value within another field.
1575 Note that it must not be the case that T contains both a PLACEHOLDER_EXPR
1576 and some variable since it would then need to be both evaluated once and
1577 evaluated more than once. Front-ends must assure this case cannot
1578 happen by surrounding any such subexpressions in their own SAVE_EXPR
1579 and forcing evaluation at the proper time. */
1580 if (contains_placeholder_p (t
))
1583 t
= build (SAVE_EXPR
, TREE_TYPE (expr
), t
, current_function_decl
, NULL_TREE
);
1585 /* This expression might be placed ahead of a jump to ensure that the
1586 value was computed on both sides of the jump. So make sure it isn't
1587 eliminated as dead. */
1588 TREE_SIDE_EFFECTS (t
) = 1;
1589 TREE_READONLY (t
) = 1;
1593 /* Arrange for an expression to be expanded multiple independent
1594 times. This is useful for cleanup actions, as the backend can
1595 expand them multiple times in different places. */
1603 /* If this is already protected, no sense in protecting it again. */
1604 if (TREE_CODE (expr
) == UNSAVE_EXPR
)
1607 t
= build1 (UNSAVE_EXPR
, TREE_TYPE (expr
), expr
);
1608 TREE_SIDE_EFFECTS (t
) = TREE_SIDE_EFFECTS (expr
);
1612 /* Returns the index of the first non-tree operand for CODE, or the number
1613 of operands if all are trees. */
1617 enum tree_code code
;
1623 case GOTO_SUBROUTINE_EXPR
:
1626 case WITH_CLEANUP_EXPR
:
1628 case METHOD_CALL_EXPR
:
1631 return TREE_CODE_LENGTH (code
);
1635 /* Perform any modifications to EXPR required when it is unsaved. Does
1636 not recurse into EXPR's subtrees. */
1639 unsave_expr_1 (expr
)
1642 switch (TREE_CODE (expr
))
1645 if (! SAVE_EXPR_PERSISTENT_P (expr
))
1646 SAVE_EXPR_RTL (expr
) = 0;
1650 /* Don't mess with a TARGET_EXPR that hasn't been expanded.
1651 It's OK for this to happen if it was part of a subtree that
1652 isn't immediately expanded, such as operand 2 of another
1654 if (TREE_OPERAND (expr
, 1))
1657 TREE_OPERAND (expr
, 1) = TREE_OPERAND (expr
, 3);
1658 TREE_OPERAND (expr
, 3) = NULL_TREE
;
1662 /* I don't yet know how to emit a sequence multiple times. */
1663 if (RTL_EXPR_SEQUENCE (expr
) != 0)
1668 if (lang_unsave_expr_now
!= 0)
1669 (*lang_unsave_expr_now
) (expr
);
1674 /* Helper function for unsave_expr_now. */
1677 unsave_expr_now_r (expr
)
1680 enum tree_code code
;
1682 /* There's nothing to do for NULL_TREE. */
1686 unsave_expr_1 (expr
);
1688 code
= TREE_CODE (expr
);
1689 switch (TREE_CODE_CLASS (code
))
1691 case 'c': /* a constant */
1692 case 't': /* a type node */
1693 case 'd': /* A decl node */
1694 case 'b': /* A block node */
1697 case 'x': /* miscellaneous: e.g., identifier, TREE_LIST or ERROR_MARK. */
1698 if (code
== TREE_LIST
)
1700 unsave_expr_now_r (TREE_VALUE (expr
));
1701 unsave_expr_now_r (TREE_CHAIN (expr
));
1705 case 'e': /* an expression */
1706 case 'r': /* a reference */
1707 case 's': /* an expression with side effects */
1708 case '<': /* a comparison expression */
1709 case '2': /* a binary arithmetic expression */
1710 case '1': /* a unary arithmetic expression */
1714 for (i
= first_rtl_op (code
) - 1; i
>= 0; i
--)
1715 unsave_expr_now_r (TREE_OPERAND (expr
, i
));
1724 /* Modify a tree in place so that all the evaluate only once things
1725 are cleared out. Return the EXPR given. */
1728 unsave_expr_now (expr
)
1731 if (lang_unsave
!= 0)
1732 (*lang_unsave
) (&expr
);
1734 unsave_expr_now_r (expr
);
1739 /* Return 0 if it is safe to evaluate EXPR multiple times,
1740 return 1 if it is safe if EXPR is unsaved afterward, or
1741 return 2 if it is completely unsafe.
1743 This assumes that CALL_EXPRs and TARGET_EXPRs are never replicated in
1744 an expression tree, so that it safe to unsave them and the surrounding
1745 context will be correct.
1747 SAVE_EXPRs basically *only* appear replicated in an expression tree,
1748 occasionally across the whole of a function. It is therefore only
1749 safe to unsave a SAVE_EXPR if you know that all occurrences appear
1750 below the UNSAVE_EXPR.
1752 RTL_EXPRs consume their rtl during evaluation. It is therefore
1753 never possible to unsave them. */
1756 unsafe_for_reeval (expr
)
1760 enum tree_code code
;
1765 if (expr
== NULL_TREE
)
1768 code
= TREE_CODE (expr
);
1769 first_rtl
= first_rtl_op (code
);
1778 for (exp
= expr
; exp
!= 0; exp
= TREE_CHAIN (exp
))
1780 tmp
= unsafe_for_reeval (TREE_VALUE (exp
));
1781 unsafeness
= MAX (tmp
, unsafeness
);
1787 tmp
= unsafe_for_reeval (TREE_OPERAND (expr
, 1));
1788 return MAX (tmp
, 1);
1795 if (lang_unsafe_for_reeval
!= 0)
1797 tmp
= (*lang_unsafe_for_reeval
) (expr
);
1804 switch (TREE_CODE_CLASS (code
))
1806 case 'c': /* a constant */
1807 case 't': /* a type node */
1808 case 'x': /* something random, like an identifier or an ERROR_MARK. */
1809 case 'd': /* A decl node */
1810 case 'b': /* A block node */
1813 case 'e': /* an expression */
1814 case 'r': /* a reference */
1815 case 's': /* an expression with side effects */
1816 case '<': /* a comparison expression */
1817 case '2': /* a binary arithmetic expression */
1818 case '1': /* a unary arithmetic expression */
1819 for (i
= first_rtl
- 1; i
>= 0; i
--)
1821 tmp
= unsafe_for_reeval (TREE_OPERAND (expr
, i
));
1822 unsafeness
= MAX (tmp
, unsafeness
);
1832 /* Return 1 if EXP contains a PLACEHOLDER_EXPR; i.e., if it represents a size
1833 or offset that depends on a field within a record. */
1836 contains_placeholder_p (exp
)
1839 register enum tree_code code
;
1845 /* If we have a WITH_RECORD_EXPR, it "cancels" any PLACEHOLDER_EXPR
1846 in it since it is supplying a value for it. */
1847 code
= TREE_CODE (exp
);
1848 if (code
== WITH_RECORD_EXPR
)
1850 else if (code
== PLACEHOLDER_EXPR
)
1853 switch (TREE_CODE_CLASS (code
))
1856 /* Don't look at any PLACEHOLDER_EXPRs that might be in index or bit
1857 position computations since they will be converted into a
1858 WITH_RECORD_EXPR involving the reference, which will assume
1859 here will be valid. */
1860 return contains_placeholder_p (TREE_OPERAND (exp
, 0));
1863 if (code
== TREE_LIST
)
1864 return (contains_placeholder_p (TREE_VALUE (exp
))
1865 || (TREE_CHAIN (exp
) != 0
1866 && contains_placeholder_p (TREE_CHAIN (exp
))));
1875 /* Ignoring the first operand isn't quite right, but works best. */
1876 return contains_placeholder_p (TREE_OPERAND (exp
, 1));
1883 return (contains_placeholder_p (TREE_OPERAND (exp
, 0))
1884 || contains_placeholder_p (TREE_OPERAND (exp
, 1))
1885 || contains_placeholder_p (TREE_OPERAND (exp
, 2)));
1888 /* If we already know this doesn't have a placeholder, don't
1890 if (SAVE_EXPR_NOPLACEHOLDER (exp
) || SAVE_EXPR_RTL (exp
) != 0)
1893 SAVE_EXPR_NOPLACEHOLDER (exp
) = 1;
1894 result
= contains_placeholder_p (TREE_OPERAND (exp
, 0));
1896 SAVE_EXPR_NOPLACEHOLDER (exp
) = 0;
1901 return (TREE_OPERAND (exp
, 1) != 0
1902 && contains_placeholder_p (TREE_OPERAND (exp
, 1)));
1908 switch (TREE_CODE_LENGTH (code
))
1911 return contains_placeholder_p (TREE_OPERAND (exp
, 0));
1913 return (contains_placeholder_p (TREE_OPERAND (exp
, 0))
1914 || contains_placeholder_p (TREE_OPERAND (exp
, 1)));
1925 /* Return 1 if EXP contains any expressions that produce cleanups for an
1926 outer scope to deal with. Used by fold. */
1934 if (! TREE_SIDE_EFFECTS (exp
))
1937 switch (TREE_CODE (exp
))
1940 case GOTO_SUBROUTINE_EXPR
:
1941 case WITH_CLEANUP_EXPR
:
1944 case CLEANUP_POINT_EXPR
:
1948 for (exp
= TREE_OPERAND (exp
, 1); exp
; exp
= TREE_CHAIN (exp
))
1950 cmp
= has_cleanups (TREE_VALUE (exp
));
1960 /* This general rule works for most tree codes. All exceptions should be
1961 handled above. If this is a language-specific tree code, we can't
1962 trust what might be in the operand, so say we don't know
1964 if ((int) TREE_CODE (exp
) >= (int) LAST_AND_UNUSED_TREE_CODE
)
1967 nops
= first_rtl_op (TREE_CODE (exp
));
1968 for (i
= 0; i
< nops
; i
++)
1969 if (TREE_OPERAND (exp
, i
) != 0)
1971 int type
= TREE_CODE_CLASS (TREE_CODE (TREE_OPERAND (exp
, i
)));
1972 if (type
== 'e' || type
== '<' || type
== '1' || type
== '2'
1973 || type
== 'r' || type
== 's')
1975 cmp
= has_cleanups (TREE_OPERAND (exp
, i
));
1984 /* Given a tree EXP, a FIELD_DECL F, and a replacement value R,
1985 return a tree with all occurrences of references to F in a
1986 PLACEHOLDER_EXPR replaced by R. Note that we assume here that EXP
1987 contains only arithmetic expressions or a CALL_EXPR with a
1988 PLACEHOLDER_EXPR occurring only in its arglist. */
1991 substitute_in_expr (exp
, f
, r
)
1996 enum tree_code code
= TREE_CODE (exp
);
2001 switch (TREE_CODE_CLASS (code
))
2008 if (code
== PLACEHOLDER_EXPR
)
2010 else if (code
== TREE_LIST
)
2012 op0
= (TREE_CHAIN (exp
) == 0
2013 ? 0 : substitute_in_expr (TREE_CHAIN (exp
), f
, r
));
2014 op1
= substitute_in_expr (TREE_VALUE (exp
), f
, r
);
2015 if (op0
== TREE_CHAIN (exp
) && op1
== TREE_VALUE (exp
))
2018 return tree_cons (TREE_PURPOSE (exp
), op1
, op0
);
2027 switch (TREE_CODE_LENGTH (code
))
2030 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2031 if (op0
== TREE_OPERAND (exp
, 0))
2034 if (code
== NON_LVALUE_EXPR
)
2037 new = fold (build1 (code
, TREE_TYPE (exp
), op0
));
2041 /* An RTL_EXPR cannot contain a PLACEHOLDER_EXPR; a CONSTRUCTOR
2042 could, but we don't support it. */
2043 if (code
== RTL_EXPR
)
2045 else if (code
== CONSTRUCTOR
)
2048 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2049 op1
= substitute_in_expr (TREE_OPERAND (exp
, 1), f
, r
);
2050 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1))
2053 new = fold (build (code
, TREE_TYPE (exp
), op0
, op1
));
2057 /* It cannot be that anything inside a SAVE_EXPR contains a
2058 PLACEHOLDER_EXPR. */
2059 if (code
== SAVE_EXPR
)
2062 else if (code
== CALL_EXPR
)
2064 op1
= substitute_in_expr (TREE_OPERAND (exp
, 1), f
, r
);
2065 if (op1
== TREE_OPERAND (exp
, 1))
2068 return build (code
, TREE_TYPE (exp
),
2069 TREE_OPERAND (exp
, 0), op1
, NULL_TREE
);
2072 else if (code
!= COND_EXPR
)
2075 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2076 op1
= substitute_in_expr (TREE_OPERAND (exp
, 1), f
, r
);
2077 op2
= substitute_in_expr (TREE_OPERAND (exp
, 2), f
, r
);
2078 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2079 && op2
== TREE_OPERAND (exp
, 2))
2082 new = fold (build (code
, TREE_TYPE (exp
), op0
, op1
, op2
));
2095 /* If this expression is getting a value from a PLACEHOLDER_EXPR
2096 and it is the right field, replace it with R. */
2097 for (inner
= TREE_OPERAND (exp
, 0);
2098 TREE_CODE_CLASS (TREE_CODE (inner
)) == 'r';
2099 inner
= TREE_OPERAND (inner
, 0))
2101 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
2102 && TREE_OPERAND (exp
, 1) == f
)
2105 /* If this expression hasn't been completed let, leave it
2107 if (TREE_CODE (inner
) == PLACEHOLDER_EXPR
2108 && TREE_TYPE (inner
) == 0)
2111 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2112 if (op0
== TREE_OPERAND (exp
, 0))
2115 new = fold (build (code
, TREE_TYPE (exp
), op0
,
2116 TREE_OPERAND (exp
, 1)));
2120 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2121 op1
= substitute_in_expr (TREE_OPERAND (exp
, 1), f
, r
);
2122 op2
= substitute_in_expr (TREE_OPERAND (exp
, 2), f
, r
);
2123 if (op0
== TREE_OPERAND (exp
, 0) && op1
== TREE_OPERAND (exp
, 1)
2124 && op2
== TREE_OPERAND (exp
, 2))
2127 new = fold (build (code
, TREE_TYPE (exp
), op0
, op1
, op2
));
2132 op0
= substitute_in_expr (TREE_OPERAND (exp
, 0), f
, r
);
2133 if (op0
== TREE_OPERAND (exp
, 0))
2136 new = fold (build1 (code
, TREE_TYPE (exp
), op0
));
2148 TREE_READONLY (new) = TREE_READONLY (exp
);
2152 /* Stabilize a reference so that we can use it any number of times
2153 without causing its operands to be evaluated more than once.
2154 Returns the stabilized reference. This works by means of save_expr,
2155 so see the caveats in the comments about save_expr.
2157 Also allows conversion expressions whose operands are references.
2158 Any other kind of expression is returned unchanged. */
2161 stabilize_reference (ref
)
2164 register tree result
;
2165 register enum tree_code code
= TREE_CODE (ref
);
2172 /* No action is needed in this case. */
2178 case FIX_TRUNC_EXPR
:
2179 case FIX_FLOOR_EXPR
:
2180 case FIX_ROUND_EXPR
:
2182 result
= build_nt (code
, stabilize_reference (TREE_OPERAND (ref
, 0)));
2186 result
= build_nt (INDIRECT_REF
,
2187 stabilize_reference_1 (TREE_OPERAND (ref
, 0)));
2191 result
= build_nt (COMPONENT_REF
,
2192 stabilize_reference (TREE_OPERAND (ref
, 0)),
2193 TREE_OPERAND (ref
, 1));
2197 result
= build_nt (BIT_FIELD_REF
,
2198 stabilize_reference (TREE_OPERAND (ref
, 0)),
2199 stabilize_reference_1 (TREE_OPERAND (ref
, 1)),
2200 stabilize_reference_1 (TREE_OPERAND (ref
, 2)));
2204 result
= build_nt (ARRAY_REF
,
2205 stabilize_reference (TREE_OPERAND (ref
, 0)),
2206 stabilize_reference_1 (TREE_OPERAND (ref
, 1)));
2209 case ARRAY_RANGE_REF
:
2210 result
= build_nt (ARRAY_RANGE_REF
,
2211 stabilize_reference (TREE_OPERAND (ref
, 0)),
2212 stabilize_reference_1 (TREE_OPERAND (ref
, 1)));
2216 /* We cannot wrap the first expression in a SAVE_EXPR, as then
2217 it wouldn't be ignored. This matters when dealing with
2219 return stabilize_reference_1 (ref
);
2222 result
= build1 (INDIRECT_REF
, TREE_TYPE (ref
),
2223 save_expr (build1 (ADDR_EXPR
,
2224 build_pointer_type (TREE_TYPE (ref
)),
2228 /* If arg isn't a kind of lvalue we recognize, make no change.
2229 Caller should recognize the error for an invalid lvalue. */
2234 return error_mark_node
;
2237 TREE_TYPE (result
) = TREE_TYPE (ref
);
2238 TREE_READONLY (result
) = TREE_READONLY (ref
);
2239 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (ref
);
2240 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (ref
);
2245 /* Subroutine of stabilize_reference; this is called for subtrees of
2246 references. Any expression with side-effects must be put in a SAVE_EXPR
2247 to ensure that it is only evaluated once.
2249 We don't put SAVE_EXPR nodes around everything, because assigning very
2250 simple expressions to temporaries causes us to miss good opportunities
2251 for optimizations. Among other things, the opportunity to fold in the
2252 addition of a constant into an addressing mode often gets lost, e.g.
2253 "y[i+1] += x;". In general, we take the approach that we should not make
2254 an assignment unless we are forced into it - i.e., that any non-side effect
2255 operator should be allowed, and that cse should take care of coalescing
2256 multiple utterances of the same expression should that prove fruitful. */
2259 stabilize_reference_1 (e
)
2262 register tree result
;
2263 register enum tree_code code
= TREE_CODE (e
);
2265 /* We cannot ignore const expressions because it might be a reference
2266 to a const array but whose index contains side-effects. But we can
2267 ignore things that are actual constant or that already have been
2268 handled by this function. */
2270 if (TREE_CONSTANT (e
) || code
== SAVE_EXPR
)
2273 switch (TREE_CODE_CLASS (code
))
2283 /* If the expression has side-effects, then encase it in a SAVE_EXPR
2284 so that it will only be evaluated once. */
2285 /* The reference (r) and comparison (<) classes could be handled as
2286 below, but it is generally faster to only evaluate them once. */
2287 if (TREE_SIDE_EFFECTS (e
))
2288 return save_expr (e
);
2292 /* Constants need no processing. In fact, we should never reach
2297 /* Division is slow and tends to be compiled with jumps,
2298 especially the division by powers of 2 that is often
2299 found inside of an array reference. So do it just once. */
2300 if (code
== TRUNC_DIV_EXPR
|| code
== TRUNC_MOD_EXPR
2301 || code
== FLOOR_DIV_EXPR
|| code
== FLOOR_MOD_EXPR
2302 || code
== CEIL_DIV_EXPR
|| code
== CEIL_MOD_EXPR
2303 || code
== ROUND_DIV_EXPR
|| code
== ROUND_MOD_EXPR
)
2304 return save_expr (e
);
2305 /* Recursively stabilize each operand. */
2306 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)),
2307 stabilize_reference_1 (TREE_OPERAND (e
, 1)));
2311 /* Recursively stabilize each operand. */
2312 result
= build_nt (code
, stabilize_reference_1 (TREE_OPERAND (e
, 0)));
2319 TREE_TYPE (result
) = TREE_TYPE (e
);
2320 TREE_READONLY (result
) = TREE_READONLY (e
);
2321 TREE_SIDE_EFFECTS (result
) = TREE_SIDE_EFFECTS (e
);
2322 TREE_THIS_VOLATILE (result
) = TREE_THIS_VOLATILE (e
);
2327 /* Low-level constructors for expressions. */
2329 /* Build an expression of code CODE, data type TYPE,
2330 and operands as specified by the arguments ARG1 and following arguments.
2331 Expressions and reference nodes can be created this way.
2332 Constants, decls, types and misc nodes cannot be. */
2335 build
VPARAMS ((enum tree_code code
, tree tt
, ...))
2338 register int length
;
2344 VA_FIXEDARG (p
, enum tree_code
, code
);
2345 VA_FIXEDARG (p
, tree
, tt
);
2347 t
= make_node (code
);
2348 length
= TREE_CODE_LENGTH (code
);
2351 /* Below, we automatically set TREE_SIDE_EFFECTS and TREE_READONLY for the
2352 result based on those same flags for the arguments. But if the
2353 arguments aren't really even `tree' expressions, we shouldn't be trying
2355 fro
= first_rtl_op (code
);
2357 /* Expressions without side effects may be constant if their
2358 arguments are as well. */
2359 constant
= (TREE_CODE_CLASS (code
) == '<'
2360 || TREE_CODE_CLASS (code
) == '1'
2361 || TREE_CODE_CLASS (code
) == '2'
2362 || TREE_CODE_CLASS (code
) == 'c');
2366 /* This is equivalent to the loop below, but faster. */
2367 register tree arg0
= va_arg (p
, tree
);
2368 register tree arg1
= va_arg (p
, tree
);
2370 TREE_OPERAND (t
, 0) = arg0
;
2371 TREE_OPERAND (t
, 1) = arg1
;
2372 TREE_READONLY (t
) = 1;
2373 if (arg0
&& fro
> 0)
2375 if (TREE_SIDE_EFFECTS (arg0
))
2376 TREE_SIDE_EFFECTS (t
) = 1;
2377 if (!TREE_READONLY (arg0
))
2378 TREE_READONLY (t
) = 0;
2379 if (!TREE_CONSTANT (arg0
))
2383 if (arg1
&& fro
> 1)
2385 if (TREE_SIDE_EFFECTS (arg1
))
2386 TREE_SIDE_EFFECTS (t
) = 1;
2387 if (!TREE_READONLY (arg1
))
2388 TREE_READONLY (t
) = 0;
2389 if (!TREE_CONSTANT (arg1
))
2393 else if (length
== 1)
2395 register tree arg0
= va_arg (p
, tree
);
2397 /* The only one-operand cases we handle here are those with side-effects.
2398 Others are handled with build1. So don't bother checked if the
2399 arg has side-effects since we'll already have set it.
2401 ??? This really should use build1 too. */
2402 if (TREE_CODE_CLASS (code
) != 's')
2404 TREE_OPERAND (t
, 0) = arg0
;
2408 for (i
= 0; i
< length
; i
++)
2410 register tree operand
= va_arg (p
, tree
);
2412 TREE_OPERAND (t
, i
) = operand
;
2413 if (operand
&& fro
> i
)
2415 if (TREE_SIDE_EFFECTS (operand
))
2416 TREE_SIDE_EFFECTS (t
) = 1;
2417 if (!TREE_CONSTANT (operand
))
2424 TREE_CONSTANT (t
) = constant
;
2428 /* Same as above, but only builds for unary operators.
2429 Saves lions share of calls to `build'; cuts down use
2430 of varargs, which is expensive for RISC machines. */
2433 build1 (code
, type
, node
)
2434 enum tree_code code
;
2438 register int length
;
2439 #ifdef GATHER_STATISTICS
2440 register tree_node_kind kind
;
2444 #ifdef GATHER_STATISTICS
2445 if (TREE_CODE_CLASS (code
) == 'r')
2451 #ifdef ENABLE_CHECKING
2452 if (TREE_CODE_CLASS (code
) == '2'
2453 || TREE_CODE_CLASS (code
) == '<'
2454 || TREE_CODE_LENGTH (code
) != 1)
2456 #endif /* ENABLE_CHECKING */
2458 length
= sizeof (struct tree_exp
);
2460 t
= ggc_alloc_tree (length
);
2462 memset ((PTR
) t
, 0, sizeof (struct tree_common
));
2464 #ifdef GATHER_STATISTICS
2465 tree_node_counts
[(int) kind
]++;
2466 tree_node_sizes
[(int) kind
] += length
;
2469 TREE_SET_CODE (t
, code
);
2471 TREE_TYPE (t
) = type
;
2472 TREE_COMPLEXITY (t
) = 0;
2473 TREE_OPERAND (t
, 0) = node
;
2474 if (node
&& first_rtl_op (code
) != 0)
2476 TREE_SIDE_EFFECTS (t
) = TREE_SIDE_EFFECTS (node
);
2477 TREE_READONLY (t
) = TREE_READONLY (node
);
2486 case PREDECREMENT_EXPR
:
2487 case PREINCREMENT_EXPR
:
2488 case POSTDECREMENT_EXPR
:
2489 case POSTINCREMENT_EXPR
:
2490 /* All of these have side-effects, no matter what their
2492 TREE_SIDE_EFFECTS (t
) = 1;
2493 TREE_READONLY (t
) = 0;
2497 if (TREE_CODE_CLASS (code
) == '1' && node
&& TREE_CONSTANT (node
))
2498 TREE_CONSTANT (t
) = 1;
2505 /* Similar except don't specify the TREE_TYPE
2506 and leave the TREE_SIDE_EFFECTS as 0.
2507 It is permissible for arguments to be null,
2508 or even garbage if their values do not matter. */
2511 build_nt
VPARAMS ((enum tree_code code
, ...))
2514 register int length
;
2518 VA_FIXEDARG (p
, enum tree_code
, code
);
2520 t
= make_node (code
);
2521 length
= TREE_CODE_LENGTH (code
);
2523 for (i
= 0; i
< length
; i
++)
2524 TREE_OPERAND (t
, i
) = va_arg (p
, tree
);
2531 /* Commented out because this wants to be done very
2532 differently. See cp-lex.c. */
2534 build_op_identifier (op1
, op2
)
2537 register tree t
= make_node (OP_IDENTIFIER
);
2538 TREE_PURPOSE (t
) = op1
;
2539 TREE_VALUE (t
) = op2
;
2544 /* Create a DECL_... node of code CODE, name NAME and data type TYPE.
2545 We do NOT enter this node in any sort of symbol table.
2547 layout_decl is used to set up the decl's storage layout.
2548 Other slots are initialized to 0 or null pointers. */
2551 build_decl (code
, name
, type
)
2552 enum tree_code code
;
2557 t
= make_node (code
);
2559 /* if (type == error_mark_node)
2560 type = integer_type_node; */
2561 /* That is not done, deliberately, so that having error_mark_node
2562 as the type can suppress useless errors in the use of this variable. */
2564 DECL_NAME (t
) = name
;
2565 TREE_TYPE (t
) = type
;
2567 if (code
== VAR_DECL
|| code
== PARM_DECL
|| code
== RESULT_DECL
)
2569 else if (code
== FUNCTION_DECL
)
2570 DECL_MODE (t
) = FUNCTION_MODE
;
2575 /* BLOCK nodes are used to represent the structure of binding contours
2576 and declarations, once those contours have been exited and their contents
2577 compiled. This information is used for outputting debugging info. */
2580 build_block (vars
, tags
, subblocks
, supercontext
, chain
)
2581 tree vars
, tags ATTRIBUTE_UNUSED
, subblocks
, supercontext
, chain
;
2583 register tree block
= make_node (BLOCK
);
2585 BLOCK_VARS (block
) = vars
;
2586 BLOCK_SUBBLOCKS (block
) = subblocks
;
2587 BLOCK_SUPERCONTEXT (block
) = supercontext
;
2588 BLOCK_CHAIN (block
) = chain
;
2592 /* EXPR_WITH_FILE_LOCATION are used to keep track of the exact
2593 location where an expression or an identifier were encountered. It
2594 is necessary for languages where the frontend parser will handle
2595 recursively more than one file (Java is one of them). */
2598 build_expr_wfl (node
, file
, line
, col
)
2603 static const char *last_file
= 0;
2604 static tree last_filenode
= NULL_TREE
;
2605 register tree wfl
= make_node (EXPR_WITH_FILE_LOCATION
);
2607 EXPR_WFL_NODE (wfl
) = node
;
2608 EXPR_WFL_SET_LINECOL (wfl
, line
, col
);
2609 if (file
!= last_file
)
2612 last_filenode
= file
? get_identifier (file
) : NULL_TREE
;
2615 EXPR_WFL_FILENAME_NODE (wfl
) = last_filenode
;
2618 TREE_SIDE_EFFECTS (wfl
) = TREE_SIDE_EFFECTS (node
);
2619 TREE_TYPE (wfl
) = TREE_TYPE (node
);
2625 /* Return a declaration like DDECL except that its DECL_MACHINE_ATTRIBUTE
2629 build_decl_attribute_variant (ddecl
, attribute
)
2630 tree ddecl
, attribute
;
2632 DECL_MACHINE_ATTRIBUTES (ddecl
) = attribute
;
2636 /* Return a type like TTYPE except that its TYPE_ATTRIBUTE
2639 Record such modified types already made so we don't make duplicates. */
2642 build_type_attribute_variant (ttype
, attribute
)
2643 tree ttype
, attribute
;
2645 if ( ! attribute_list_equal (TYPE_ATTRIBUTES (ttype
), attribute
))
2647 unsigned int hashcode
;
2650 ntype
= copy_node (ttype
);
2652 TYPE_POINTER_TO (ntype
) = 0;
2653 TYPE_REFERENCE_TO (ntype
) = 0;
2654 TYPE_ATTRIBUTES (ntype
) = attribute
;
2656 /* Create a new main variant of TYPE. */
2657 TYPE_MAIN_VARIANT (ntype
) = ntype
;
2658 TYPE_NEXT_VARIANT (ntype
) = 0;
2659 set_type_quals (ntype
, TYPE_UNQUALIFIED
);
2661 hashcode
= (TYPE_HASH (TREE_CODE (ntype
))
2662 + TYPE_HASH (TREE_TYPE (ntype
))
2663 + attribute_hash_list (attribute
));
2665 switch (TREE_CODE (ntype
))
2668 hashcode
+= TYPE_HASH (TYPE_ARG_TYPES (ntype
));
2671 hashcode
+= TYPE_HASH (TYPE_DOMAIN (ntype
));
2674 hashcode
+= TYPE_HASH (TYPE_MAX_VALUE (ntype
));
2677 hashcode
+= TYPE_HASH (TYPE_PRECISION (ntype
));
2683 ntype
= type_hash_canon (hashcode
, ntype
);
2684 ttype
= build_qualified_type (ntype
, TYPE_QUALS (ttype
));
2690 /* Default value of targetm.valid_decl_attribute_p and
2691 targetm.valid_type_attribute_p that always returns false. */
2694 default_valid_attribute_p (attr_name
, attr_args
, decl
, type
)
2695 tree attr_name ATTRIBUTE_UNUSED
;
2696 tree attr_args ATTRIBUTE_UNUSED
;
2697 tree decl ATTRIBUTE_UNUSED
;
2698 tree type ATTRIBUTE_UNUSED
;
2703 /* Default value of targetm.comp_type_attributes that always returns 1. */
2706 default_comp_type_attributes (type1
, type2
)
2707 tree type1 ATTRIBUTE_UNUSED
;
2708 tree type2 ATTRIBUTE_UNUSED
;
2713 /* Default version of targetm.set_default_type_attributes that always does
2717 default_set_default_type_attributes (type
)
2718 tree type ATTRIBUTE_UNUSED
;
2722 /* Default version of targetm.insert_attributes that always does nothing. */
2724 default_insert_attributes (decl
, attr_ptr
)
2725 tree decl ATTRIBUTE_UNUSED
;
2726 tree
*attr_ptr ATTRIBUTE_UNUSED
;
2730 /* Return 1 if ATTR_NAME and ATTR_ARGS is valid for either declaration
2731 DECL or type TYPE and 0 otherwise. Validity is determined the
2732 target functions valid_decl_attribute and valid_machine_attribute. */
2735 valid_machine_attribute (attr_name
, attr_args
, decl
, type
)
2743 if (TREE_CODE (attr_name
) != IDENTIFIER_NODE
)
2748 tree decl_attrs
= DECL_MACHINE_ATTRIBUTES (decl
);
2750 if ((*targetm
.valid_decl_attribute
) (decl
, decl_attrs
, attr_name
,
2753 tree attr
= lookup_attribute (IDENTIFIER_POINTER (attr_name
),
2756 if (attr
!= NULL_TREE
)
2758 /* Override existing arguments. Declarations are unique
2759 so we can modify this in place. */
2760 TREE_VALUE (attr
) = attr_args
;
2764 decl_attrs
= tree_cons (attr_name
, attr_args
, decl_attrs
);
2765 decl
= build_decl_attribute_variant (decl
, decl_attrs
);
2768 /* Don't apply the attribute to both the decl and the type. */
2773 type_attrs
= TYPE_ATTRIBUTES (type
);
2774 if ((*targetm
.valid_type_attribute
) (type
, type_attrs
, attr_name
,
2777 tree attr
= lookup_attribute (IDENTIFIER_POINTER (attr_name
),
2780 if (attr
!= NULL_TREE
)
2782 /* Override existing arguments. ??? This currently
2783 works since attribute arguments are not included in
2784 `attribute_hash_list'. Something more complicated
2785 may be needed in the future. */
2786 TREE_VALUE (attr
) = attr_args
;
2790 /* If this is part of a declaration, create a type variant,
2791 otherwise, this is part of a type definition, so add it
2792 to the base type. */
2793 type_attrs
= tree_cons (attr_name
, attr_args
, type_attrs
);
2795 type
= build_type_attribute_variant (type
, type_attrs
);
2797 TYPE_ATTRIBUTES (type
) = type_attrs
;
2801 TREE_TYPE (decl
) = type
;
2805 /* Handle putting a type attribute on pointer-to-function-type
2806 by putting the attribute on the function type. */
2807 else if (POINTER_TYPE_P (type
)
2808 && TREE_CODE (TREE_TYPE (type
)) == FUNCTION_TYPE
2809 && (*targetm
.valid_type_attribute
) (TREE_TYPE (type
), type_attrs
,
2810 attr_name
, attr_args
))
2812 tree inner_type
= TREE_TYPE (type
);
2813 tree inner_attrs
= TYPE_ATTRIBUTES (inner_type
);
2814 tree attr
= lookup_attribute (IDENTIFIER_POINTER (attr_name
),
2817 if (attr
!= NULL_TREE
)
2818 TREE_VALUE (attr
) = attr_args
;
2821 inner_attrs
= tree_cons (attr_name
, attr_args
, inner_attrs
);
2822 inner_type
= build_type_attribute_variant (inner_type
,
2827 TREE_TYPE (decl
) = build_pointer_type (inner_type
);
2830 /* Clear TYPE_POINTER_TO for the old inner type, since
2831 `type' won't be pointing to it anymore. */
2832 TYPE_POINTER_TO (TREE_TYPE (type
)) = NULL_TREE
;
2833 TREE_TYPE (type
) = inner_type
;
2842 /* Return non-zero if IDENT is a valid name for attribute ATTR,
2845 We try both `text' and `__text__', ATTR may be either one. */
2846 /* ??? It might be a reasonable simplification to require ATTR to be only
2847 `text'. One might then also require attribute lists to be stored in
2848 their canonicalized form. */
2851 is_attribute_p (attr
, ident
)
2855 int ident_len
, attr_len
;
2858 if (TREE_CODE (ident
) != IDENTIFIER_NODE
)
2861 if (strcmp (attr
, IDENTIFIER_POINTER (ident
)) == 0)
2864 p
= IDENTIFIER_POINTER (ident
);
2865 ident_len
= strlen (p
);
2866 attr_len
= strlen (attr
);
2868 /* If ATTR is `__text__', IDENT must be `text'; and vice versa. */
2872 || attr
[attr_len
- 2] != '_'
2873 || attr
[attr_len
- 1] != '_')
2875 if (ident_len
== attr_len
- 4
2876 && strncmp (attr
+ 2, p
, attr_len
- 4) == 0)
2881 if (ident_len
== attr_len
+ 4
2882 && p
[0] == '_' && p
[1] == '_'
2883 && p
[ident_len
- 2] == '_' && p
[ident_len
- 1] == '_'
2884 && strncmp (attr
, p
+ 2, attr_len
) == 0)
2891 /* Given an attribute name and a list of attributes, return a pointer to the
2892 attribute's list element if the attribute is part of the list, or NULL_TREE
2896 lookup_attribute (attr_name
, list
)
2897 const char *attr_name
;
2902 for (l
= list
; l
; l
= TREE_CHAIN (l
))
2904 if (TREE_CODE (TREE_PURPOSE (l
)) != IDENTIFIER_NODE
)
2906 if (is_attribute_p (attr_name
, TREE_PURPOSE (l
)))
2913 /* Return an attribute list that is the union of a1 and a2. */
2916 merge_attributes (a1
, a2
)
2917 register tree a1
, a2
;
2921 /* Either one unset? Take the set one. */
2923 if ((attributes
= a1
) == 0)
2926 /* One that completely contains the other? Take it. */
2928 else if (a2
!= 0 && ! attribute_list_contained (a1
, a2
))
2930 if (attribute_list_contained (a2
, a1
))
2934 /* Pick the longest list, and hang on the other list. */
2935 /* ??? For the moment we punt on the issue of attrs with args. */
2937 if (list_length (a1
) < list_length (a2
))
2938 attributes
= a2
, a2
= a1
;
2940 for (; a2
!= 0; a2
= TREE_CHAIN (a2
))
2941 if (lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (a2
)),
2942 attributes
) == NULL_TREE
)
2944 a1
= copy_node (a2
);
2945 TREE_CHAIN (a1
) = attributes
;
2953 /* Given types T1 and T2, merge their attributes and return
2957 merge_type_attributes (t1
, t2
)
2960 return merge_attributes (TYPE_ATTRIBUTES (t1
),
2961 TYPE_ATTRIBUTES (t2
));
2964 /* Given decls OLDDECL and NEWDECL, merge their attributes and return
2968 merge_decl_attributes (olddecl
, newdecl
)
2969 tree olddecl
, newdecl
;
2971 return merge_attributes (DECL_MACHINE_ATTRIBUTES (olddecl
),
2972 DECL_MACHINE_ATTRIBUTES (newdecl
));
2975 #ifdef TARGET_DLLIMPORT_DECL_ATTRIBUTES
2977 /* Specialization of merge_decl_attributes for various Windows targets.
2979 This handles the following situation:
2981 __declspec (dllimport) int foo;
2984 The second instance of `foo' nullifies the dllimport. */
2987 merge_dllimport_decl_attributes (old
, new)
2992 int delete_dllimport_p
;
2994 old
= DECL_MACHINE_ATTRIBUTES (old
);
2995 new = DECL_MACHINE_ATTRIBUTES (new);
2997 /* What we need to do here is remove from `old' dllimport if it doesn't
2998 appear in `new'. dllimport behaves like extern: if a declaration is
2999 marked dllimport and a definition appears later, then the object
3000 is not dllimport'd. */
3001 if (lookup_attribute ("dllimport", old
) != NULL_TREE
3002 && lookup_attribute ("dllimport", new) == NULL_TREE
)
3003 delete_dllimport_p
= 1;
3005 delete_dllimport_p
= 0;
3007 a
= merge_attributes (old
, new);
3009 if (delete_dllimport_p
)
3013 /* Scan the list for dllimport and delete it. */
3014 for (prev
= NULL_TREE
, t
= a
; t
; prev
= t
, t
= TREE_CHAIN (t
))
3016 if (is_attribute_p ("dllimport", TREE_PURPOSE (t
)))
3018 if (prev
== NULL_TREE
)
3021 TREE_CHAIN (prev
) = TREE_CHAIN (t
);
3030 #endif /* TARGET_DLLIMPORT_DECL_ATTRIBUTES */
3032 /* Set the type qualifiers for TYPE to TYPE_QUALS, which is a bitmask
3033 of the various TYPE_QUAL values. */
3036 set_type_quals (type
, type_quals
)
3040 TYPE_READONLY (type
) = (type_quals
& TYPE_QUAL_CONST
) != 0;
3041 TYPE_VOLATILE (type
) = (type_quals
& TYPE_QUAL_VOLATILE
) != 0;
3042 TYPE_RESTRICT (type
) = (type_quals
& TYPE_QUAL_RESTRICT
) != 0;
3045 /* Return a version of the TYPE, qualified as indicated by the
3046 TYPE_QUALS, if one exists. If no qualified version exists yet,
3047 return NULL_TREE. */
3050 get_qualified_type (type
, type_quals
)
3056 /* Search the chain of variants to see if there is already one there just
3057 like the one we need to have. If so, use that existing one. We must
3058 preserve the TYPE_NAME, since there is code that depends on this. */
3059 for (t
= TYPE_MAIN_VARIANT (type
); t
; t
= TYPE_NEXT_VARIANT (t
))
3060 if (TYPE_QUALS (t
) == type_quals
&& TYPE_NAME (t
) == TYPE_NAME (type
))
3066 /* Like get_qualified_type, but creates the type if it does not
3067 exist. This function never returns NULL_TREE. */
3070 build_qualified_type (type
, type_quals
)
3076 /* See if we already have the appropriate qualified variant. */
3077 t
= get_qualified_type (type
, type_quals
);
3079 /* If not, build it. */
3082 t
= build_type_copy (type
);
3083 set_type_quals (t
, type_quals
);
3089 /* Create a new variant of TYPE, equivalent but distinct.
3090 This is so the caller can modify it. */
3093 build_type_copy (type
)
3096 register tree t
, m
= TYPE_MAIN_VARIANT (type
);
3098 t
= copy_node (type
);
3100 TYPE_POINTER_TO (t
) = 0;
3101 TYPE_REFERENCE_TO (t
) = 0;
3103 /* Add this type to the chain of variants of TYPE. */
3104 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (m
);
3105 TYPE_NEXT_VARIANT (m
) = t
;
3110 /* Hashing of types so that we don't make duplicates.
3111 The entry point is `type_hash_canon'. */
3113 /* Compute a hash code for a list of types (chain of TREE_LIST nodes
3114 with types in the TREE_VALUE slots), by adding the hash codes
3115 of the individual types. */
3118 type_hash_list (list
)
3121 unsigned int hashcode
;
3124 for (hashcode
= 0, tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3125 hashcode
+= TYPE_HASH (TREE_VALUE (tail
));
3130 /* These are the Hashtable callback functions. */
3132 /* Returns true if the types are equal. */
3135 type_hash_eq (va
, vb
)
3139 const struct type_hash
*a
= va
, *b
= vb
;
3140 if (a
->hash
== b
->hash
3141 && TREE_CODE (a
->type
) == TREE_CODE (b
->type
)
3142 && TREE_TYPE (a
->type
) == TREE_TYPE (b
->type
)
3143 && attribute_list_equal (TYPE_ATTRIBUTES (a
->type
),
3144 TYPE_ATTRIBUTES (b
->type
))
3145 && TYPE_ALIGN (a
->type
) == TYPE_ALIGN (b
->type
)
3146 && (TYPE_MAX_VALUE (a
->type
) == TYPE_MAX_VALUE (b
->type
)
3147 || tree_int_cst_equal (TYPE_MAX_VALUE (a
->type
),
3148 TYPE_MAX_VALUE (b
->type
)))
3149 && (TYPE_MIN_VALUE (a
->type
) == TYPE_MIN_VALUE (b
->type
)
3150 || tree_int_cst_equal (TYPE_MIN_VALUE (a
->type
),
3151 TYPE_MIN_VALUE (b
->type
)))
3152 /* Note that TYPE_DOMAIN is TYPE_ARG_TYPES for FUNCTION_TYPE. */
3153 && (TYPE_DOMAIN (a
->type
) == TYPE_DOMAIN (b
->type
)
3154 || (TYPE_DOMAIN (a
->type
)
3155 && TREE_CODE (TYPE_DOMAIN (a
->type
)) == TREE_LIST
3156 && TYPE_DOMAIN (b
->type
)
3157 && TREE_CODE (TYPE_DOMAIN (b
->type
)) == TREE_LIST
3158 && type_list_equal (TYPE_DOMAIN (a
->type
),
3159 TYPE_DOMAIN (b
->type
)))))
3164 /* Return the cached hash value. */
3167 type_hash_hash (item
)
3170 return ((const struct type_hash
*) item
)->hash
;
3173 /* Look in the type hash table for a type isomorphic to TYPE.
3174 If one is found, return it. Otherwise return 0. */
3177 type_hash_lookup (hashcode
, type
)
3178 unsigned int hashcode
;
3181 struct type_hash
*h
, in
;
3183 /* The TYPE_ALIGN field of a type is set by layout_type(), so we
3184 must call that routine before comparing TYPE_ALIGNs. */
3190 h
= htab_find_with_hash (type_hash_table
, &in
, hashcode
);
3196 /* Add an entry to the type-hash-table
3197 for a type TYPE whose hash code is HASHCODE. */
3200 type_hash_add (hashcode
, type
)
3201 unsigned int hashcode
;
3204 struct type_hash
*h
;
3207 h
= (struct type_hash
*) permalloc (sizeof (struct type_hash
));
3210 loc
= htab_find_slot_with_hash (type_hash_table
, h
, hashcode
, INSERT
);
3211 *(struct type_hash
**) loc
= h
;
3214 /* Given TYPE, and HASHCODE its hash code, return the canonical
3215 object for an identical type if one already exists.
3216 Otherwise, return TYPE, and record it as the canonical object
3217 if it is a permanent object.
3219 To use this function, first create a type of the sort you want.
3220 Then compute its hash code from the fields of the type that
3221 make it different from other similar types.
3222 Then call this function and use the value.
3223 This function frees the type you pass in if it is a duplicate. */
3225 /* Set to 1 to debug without canonicalization. Never set by program. */
3226 int debug_no_type_hash
= 0;
3229 type_hash_canon (hashcode
, type
)
3230 unsigned int hashcode
;
3235 if (debug_no_type_hash
)
3238 t1
= type_hash_lookup (hashcode
, type
);
3241 #ifdef GATHER_STATISTICS
3242 tree_node_counts
[(int) t_kind
]--;
3243 tree_node_sizes
[(int) t_kind
] -= sizeof (struct tree_type
);
3248 /* If this is a permanent type, record it for later reuse. */
3249 type_hash_add (hashcode
, type
);
3254 /* Callback function for htab_traverse. */
3257 mark_hash_entry (entry
, param
)
3259 void *param ATTRIBUTE_UNUSED
;
3261 struct type_hash
*p
= *(struct type_hash
**) entry
;
3263 ggc_mark_tree (p
->type
);
3265 /* Continue scan. */
3269 /* Mark ARG (which is really a htab_t *) for GC. */
3272 mark_type_hash (arg
)
3275 htab_t t
= *(htab_t
*) arg
;
3277 htab_traverse (t
, mark_hash_entry
, 0);
3280 /* Mark the hashtable slot pointed to by ENTRY (which is really a
3281 `tree**') for GC. */
3284 mark_tree_hashtable_entry (entry
, data
)
3286 void *data ATTRIBUTE_UNUSED
;
3288 ggc_mark_tree ((tree
) *entry
);
3292 /* Mark ARG (which is really a htab_t whose slots are trees) for
3296 mark_tree_hashtable (arg
)
3299 htab_t t
= *(htab_t
*) arg
;
3300 htab_traverse (t
, mark_tree_hashtable_entry
, 0);
3304 print_type_hash_statistics ()
3306 fprintf (stderr
, "Type hash: size %ld, %ld elements, %f collisions\n",
3307 (long) htab_size (type_hash_table
),
3308 (long) htab_elements (type_hash_table
),
3309 htab_collisions (type_hash_table
));
3312 /* Compute a hash code for a list of attributes (chain of TREE_LIST nodes
3313 with names in the TREE_PURPOSE slots and args in the TREE_VALUE slots),
3314 by adding the hash codes of the individual attributes. */
3317 attribute_hash_list (list
)
3320 unsigned int hashcode
;
3323 for (hashcode
= 0, tail
= list
; tail
; tail
= TREE_CHAIN (tail
))
3324 /* ??? Do we want to add in TREE_VALUE too? */
3325 hashcode
+= TYPE_HASH (TREE_PURPOSE (tail
));
3329 /* Given two lists of attributes, return true if list l2 is
3330 equivalent to l1. */
3333 attribute_list_equal (l1
, l2
)
3336 return attribute_list_contained (l1
, l2
)
3337 && attribute_list_contained (l2
, l1
);
3340 /* Given two lists of attributes, return true if list L2 is
3341 completely contained within L1. */
3342 /* ??? This would be faster if attribute names were stored in a canonicalized
3343 form. Otherwise, if L1 uses `foo' and L2 uses `__foo__', the long method
3344 must be used to show these elements are equivalent (which they are). */
3345 /* ??? It's not clear that attributes with arguments will always be handled
3349 attribute_list_contained (l1
, l2
)
3352 register tree t1
, t2
;
3354 /* First check the obvious, maybe the lists are identical. */
3358 /* Maybe the lists are similar. */
3359 for (t1
= l1
, t2
= l2
;
3361 && TREE_PURPOSE (t1
) == TREE_PURPOSE (t2
)
3362 && TREE_VALUE (t1
) == TREE_VALUE (t2
);
3363 t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
));
3365 /* Maybe the lists are equal. */
3366 if (t1
== 0 && t2
== 0)
3369 for (; t2
!= 0; t2
= TREE_CHAIN (t2
))
3372 = lookup_attribute (IDENTIFIER_POINTER (TREE_PURPOSE (t2
)), l1
);
3377 if (simple_cst_equal (TREE_VALUE (t2
), TREE_VALUE (attr
)) != 1)
3384 /* Given two lists of types
3385 (chains of TREE_LIST nodes with types in the TREE_VALUE slots)
3386 return 1 if the lists contain the same types in the same order.
3387 Also, the TREE_PURPOSEs must match. */
3390 type_list_equal (l1
, l2
)
3393 register tree t1
, t2
;
3395 for (t1
= l1
, t2
= l2
; t1
&& t2
; t1
= TREE_CHAIN (t1
), t2
= TREE_CHAIN (t2
))
3396 if (TREE_VALUE (t1
) != TREE_VALUE (t2
)
3397 || (TREE_PURPOSE (t1
) != TREE_PURPOSE (t2
)
3398 && ! (1 == simple_cst_equal (TREE_PURPOSE (t1
), TREE_PURPOSE (t2
))
3399 && (TREE_TYPE (TREE_PURPOSE (t1
))
3400 == TREE_TYPE (TREE_PURPOSE (t2
))))))
3406 /* Returns the number of arguments to the FUNCTION_TYPE or METHOD_TYPE
3407 given by TYPE. If the argument list accepts variable arguments,
3408 then this function counts only the ordinary arguments. */
3411 type_num_arguments (type
)
3417 for (t
= TYPE_ARG_TYPES (type
); t
; t
= TREE_CHAIN (t
))
3418 /* If the function does not take a variable number of arguments,
3419 the last element in the list will have type `void'. */
3420 if (VOID_TYPE_P (TREE_VALUE (t
)))
3428 /* Nonzero if integer constants T1 and T2
3429 represent the same constant value. */
3432 tree_int_cst_equal (t1
, t2
)
3438 if (t1
== 0 || t2
== 0)
3441 if (TREE_CODE (t1
) == INTEGER_CST
3442 && TREE_CODE (t2
) == INTEGER_CST
3443 && TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
3444 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
))
3450 /* Nonzero if integer constants T1 and T2 represent values that satisfy <.
3451 The precise way of comparison depends on their data type. */
3454 tree_int_cst_lt (t1
, t2
)
3460 if (! TREE_UNSIGNED (TREE_TYPE (t1
)))
3461 return INT_CST_LT (t1
, t2
);
3463 return INT_CST_LT_UNSIGNED (t1
, t2
);
3466 /* Returns -1 if T1 < T2, 0 if T1 == T2, and 1 if T1 > T2. */
3469 tree_int_cst_compare (t1
, t2
)
3473 if (tree_int_cst_lt (t1
, t2
))
3475 else if (tree_int_cst_lt (t2
, t1
))
3481 /* Return 1 if T is an INTEGER_CST that can be represented in a single
3482 HOST_WIDE_INT value. If POS is nonzero, the result must be positive. */
3485 host_integerp (t
, pos
)
3489 return (TREE_CODE (t
) == INTEGER_CST
3490 && ! TREE_OVERFLOW (t
)
3491 && ((TREE_INT_CST_HIGH (t
) == 0
3492 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) >= 0)
3493 || (! pos
&& TREE_INT_CST_HIGH (t
) == -1
3494 && (HOST_WIDE_INT
) TREE_INT_CST_LOW (t
) < 0)
3495 || (! pos
&& TREE_INT_CST_HIGH (t
) == 0
3496 && TREE_UNSIGNED (TREE_TYPE (t
)))));
3499 /* Return the HOST_WIDE_INT least significant bits of T if it is an
3500 INTEGER_CST and there is no overflow. POS is nonzero if the result must
3501 be positive. Abort if we cannot satisfy the above conditions. */
3504 tree_low_cst (t
, pos
)
3508 if (host_integerp (t
, pos
))
3509 return TREE_INT_CST_LOW (t
);
3514 /* Return the most significant bit of the integer constant T. */
3517 tree_int_cst_msb (t
)
3522 unsigned HOST_WIDE_INT l
;
3524 /* Note that using TYPE_PRECISION here is wrong. We care about the
3525 actual bits, not the (arbitrary) range of the type. */
3526 prec
= GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (t
))) - 1;
3527 rshift_double (TREE_INT_CST_LOW (t
), TREE_INT_CST_HIGH (t
), prec
,
3528 2 * HOST_BITS_PER_WIDE_INT
, &l
, &h
, 0);
3529 return (l
& 1) == 1;
3532 /* Return an indication of the sign of the integer constant T.
3533 The return value is -1 if T < 0, 0 if T == 0, and 1 if T > 0.
3534 Note that -1 will never be returned it T's type is unsigned. */
3537 tree_int_cst_sgn (t
)
3540 if (TREE_INT_CST_LOW (t
) == 0 && TREE_INT_CST_HIGH (t
) == 0)
3542 else if (TREE_UNSIGNED (TREE_TYPE (t
)))
3544 else if (TREE_INT_CST_HIGH (t
) < 0)
3550 /* Compare two constructor-element-type constants. Return 1 if the lists
3551 are known to be equal; otherwise return 0. */
3554 simple_cst_list_equal (l1
, l2
)
3557 while (l1
!= NULL_TREE
&& l2
!= NULL_TREE
)
3559 if (simple_cst_equal (TREE_VALUE (l1
), TREE_VALUE (l2
)) != 1)
3562 l1
= TREE_CHAIN (l1
);
3563 l2
= TREE_CHAIN (l2
);
3569 /* Return truthvalue of whether T1 is the same tree structure as T2.
3570 Return 1 if they are the same.
3571 Return 0 if they are understandably different.
3572 Return -1 if either contains tree structure not understood by
3576 simple_cst_equal (t1
, t2
)
3579 register enum tree_code code1
, code2
;
3585 if (t1
== 0 || t2
== 0)
3588 code1
= TREE_CODE (t1
);
3589 code2
= TREE_CODE (t2
);
3591 if (code1
== NOP_EXPR
|| code1
== CONVERT_EXPR
|| code1
== NON_LVALUE_EXPR
)
3593 if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
3594 || code2
== NON_LVALUE_EXPR
)
3595 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3597 return simple_cst_equal (TREE_OPERAND (t1
, 0), t2
);
3600 else if (code2
== NOP_EXPR
|| code2
== CONVERT_EXPR
3601 || code2
== NON_LVALUE_EXPR
)
3602 return simple_cst_equal (t1
, TREE_OPERAND (t2
, 0));
3610 return (TREE_INT_CST_LOW (t1
) == TREE_INT_CST_LOW (t2
)
3611 && TREE_INT_CST_HIGH (t1
) == TREE_INT_CST_HIGH (t2
));
3614 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3617 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3618 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3619 TREE_STRING_LENGTH (t1
)));
3622 if (CONSTRUCTOR_ELTS (t1
) == CONSTRUCTOR_ELTS (t2
))
3628 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3631 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3635 simple_cst_list_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
3638 /* Special case: if either target is an unallocated VAR_DECL,
3639 it means that it's going to be unified with whatever the
3640 TARGET_EXPR is really supposed to initialize, so treat it
3641 as being equivalent to anything. */
3642 if ((TREE_CODE (TREE_OPERAND (t1
, 0)) == VAR_DECL
3643 && DECL_NAME (TREE_OPERAND (t1
, 0)) == NULL_TREE
3644 && !DECL_RTL_SET_P (TREE_OPERAND (t1
, 0)))
3645 || (TREE_CODE (TREE_OPERAND (t2
, 0)) == VAR_DECL
3646 && DECL_NAME (TREE_OPERAND (t2
, 0)) == NULL_TREE
3647 && !DECL_RTL_SET_P (TREE_OPERAND (t2
, 0))))
3650 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3655 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1));
3657 case WITH_CLEANUP_EXPR
:
3658 cmp
= simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3662 return simple_cst_equal (TREE_OPERAND (t1
, 1), TREE_OPERAND (t1
, 1));
3665 if (TREE_OPERAND (t1
, 1) == TREE_OPERAND (t2
, 1))
3666 return simple_cst_equal (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3680 /* This general rule works for most tree codes. All exceptions should be
3681 handled above. If this is a language-specific tree code, we can't
3682 trust what might be in the operand, so say we don't know
3684 if ((int) code1
>= (int) LAST_AND_UNUSED_TREE_CODE
)
3687 switch (TREE_CODE_CLASS (code1
))
3696 for (i
= 0; i
< TREE_CODE_LENGTH (code1
); i
++)
3698 cmp
= simple_cst_equal (TREE_OPERAND (t1
, i
), TREE_OPERAND (t2
, i
));
3710 /* Compare the value of T, an INTEGER_CST, with U, an unsigned integer value.
3711 Return -1, 0, or 1 if the value of T is less than, equal to, or greater
3712 than U, respectively. */
3715 compare_tree_int (t
, u
)
3719 if (tree_int_cst_sgn (t
) < 0)
3721 else if (TREE_INT_CST_HIGH (t
) != 0)
3723 else if (TREE_INT_CST_LOW (t
) == u
)
3725 else if (TREE_INT_CST_LOW (t
) < u
)
3731 /* Constructors for pointer, array and function types.
3732 (RECORD_TYPE, UNION_TYPE and ENUMERAL_TYPE nodes are
3733 constructed by language-dependent code, not here.) */
3735 /* Construct, lay out and return the type of pointers to TO_TYPE.
3736 If such a type has already been constructed, reuse it. */
3739 build_pointer_type (to_type
)
3742 register tree t
= TYPE_POINTER_TO (to_type
);
3744 /* First, if we already have a type for pointers to TO_TYPE, use it. */
3749 /* We need a new one. */
3750 t
= make_node (POINTER_TYPE
);
3752 TREE_TYPE (t
) = to_type
;
3754 /* Record this type as the pointer to TO_TYPE. */
3755 TYPE_POINTER_TO (to_type
) = t
;
3757 /* Lay out the type. This function has many callers that are concerned
3758 with expression-construction, and this simplifies them all.
3759 Also, it guarantees the TYPE_SIZE is in the same obstack as the type. */
3765 /* Build the node for the type of references-to-TO_TYPE. */
3768 build_reference_type (to_type
)
3771 register tree t
= TYPE_REFERENCE_TO (to_type
);
3773 /* First, if we already have a type for pointers to TO_TYPE, use it. */
3778 /* We need a new one. */
3779 t
= make_node (REFERENCE_TYPE
);
3781 TREE_TYPE (t
) = to_type
;
3783 /* Record this type as the pointer to TO_TYPE. */
3784 TYPE_REFERENCE_TO (to_type
) = t
;
3791 /* Build a type that is compatible with t but has no cv quals anywhere
3794 const char *const *const * -> char ***. */
3797 build_type_no_quals (t
)
3800 switch (TREE_CODE (t
))
3803 return build_pointer_type (build_type_no_quals (TREE_TYPE (t
)));
3804 case REFERENCE_TYPE
:
3805 return build_reference_type (build_type_no_quals (TREE_TYPE (t
)));
3807 return TYPE_MAIN_VARIANT (t
);
3811 /* Create a type of integers to be the TYPE_DOMAIN of an ARRAY_TYPE.
3812 MAXVAL should be the maximum value in the domain
3813 (one less than the length of the array).
3815 The maximum value that MAXVAL can have is INT_MAX for a HOST_WIDE_INT.
3816 We don't enforce this limit, that is up to caller (e.g. language front end).
3817 The limit exists because the result is a signed type and we don't handle
3818 sizes that use more than one HOST_WIDE_INT. */
3821 build_index_type (maxval
)
3824 register tree itype
= make_node (INTEGER_TYPE
);
3826 TREE_TYPE (itype
) = sizetype
;
3827 TYPE_PRECISION (itype
) = TYPE_PRECISION (sizetype
);
3828 TYPE_MIN_VALUE (itype
) = size_zero_node
;
3829 TYPE_MAX_VALUE (itype
) = convert (sizetype
, maxval
);
3830 TYPE_MODE (itype
) = TYPE_MODE (sizetype
);
3831 TYPE_SIZE (itype
) = TYPE_SIZE (sizetype
);
3832 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (sizetype
);
3833 TYPE_ALIGN (itype
) = TYPE_ALIGN (sizetype
);
3834 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (sizetype
);
3836 if (host_integerp (maxval
, 1))
3837 return type_hash_canon (tree_low_cst (maxval
, 1), itype
);
3842 /* Create a range of some discrete type TYPE (an INTEGER_TYPE,
3843 ENUMERAL_TYPE, BOOLEAN_TYPE, or CHAR_TYPE), with
3844 low bound LOWVAL and high bound HIGHVAL.
3845 if TYPE==NULL_TREE, sizetype is used. */
3848 build_range_type (type
, lowval
, highval
)
3849 tree type
, lowval
, highval
;
3851 register tree itype
= make_node (INTEGER_TYPE
);
3853 TREE_TYPE (itype
) = type
;
3854 if (type
== NULL_TREE
)
3857 TYPE_MIN_VALUE (itype
) = convert (type
, lowval
);
3858 TYPE_MAX_VALUE (itype
) = highval
? convert (type
, highval
) : NULL
;
3860 TYPE_PRECISION (itype
) = TYPE_PRECISION (type
);
3861 TYPE_MODE (itype
) = TYPE_MODE (type
);
3862 TYPE_SIZE (itype
) = TYPE_SIZE (type
);
3863 TYPE_SIZE_UNIT (itype
) = TYPE_SIZE_UNIT (type
);
3864 TYPE_ALIGN (itype
) = TYPE_ALIGN (type
);
3865 TYPE_USER_ALIGN (itype
) = TYPE_USER_ALIGN (type
);
3867 if (host_integerp (lowval
, 0) && highval
!= 0 && host_integerp (highval
, 0))
3868 return type_hash_canon (tree_low_cst (highval
, 0)
3869 - tree_low_cst (lowval
, 0),
3875 /* Just like build_index_type, but takes lowval and highval instead
3876 of just highval (maxval). */
3879 build_index_2_type (lowval
,highval
)
3880 tree lowval
, highval
;
3882 return build_range_type (sizetype
, lowval
, highval
);
3885 /* Return nonzero iff ITYPE1 and ITYPE2 are equal (in the LISP sense).
3886 Needed because when index types are not hashed, equal index types
3887 built at different times appear distinct, even though structurally,
3891 index_type_equal (itype1
, itype2
)
3892 tree itype1
, itype2
;
3894 if (TREE_CODE (itype1
) != TREE_CODE (itype2
))
3897 if (TREE_CODE (itype1
) == INTEGER_TYPE
)
3899 if (TYPE_PRECISION (itype1
) != TYPE_PRECISION (itype2
)
3900 || TYPE_MODE (itype1
) != TYPE_MODE (itype2
)
3901 || simple_cst_equal (TYPE_SIZE (itype1
), TYPE_SIZE (itype2
)) != 1
3902 || TYPE_ALIGN (itype1
) != TYPE_ALIGN (itype2
))
3905 if (1 == simple_cst_equal (TYPE_MIN_VALUE (itype1
),
3906 TYPE_MIN_VALUE (itype2
))
3907 && 1 == simple_cst_equal (TYPE_MAX_VALUE (itype1
),
3908 TYPE_MAX_VALUE (itype2
)))
3915 /* Construct, lay out and return the type of arrays of elements with ELT_TYPE
3916 and number of elements specified by the range of values of INDEX_TYPE.
3917 If such a type has already been constructed, reuse it. */
3920 build_array_type (elt_type
, index_type
)
3921 tree elt_type
, index_type
;
3924 unsigned int hashcode
;
3926 if (TREE_CODE (elt_type
) == FUNCTION_TYPE
)
3928 error ("arrays of functions are not meaningful");
3929 elt_type
= integer_type_node
;
3932 /* Make sure TYPE_POINTER_TO (elt_type) is filled in. */
3933 build_pointer_type (elt_type
);
3935 /* Allocate the array after the pointer type,
3936 in case we free it in type_hash_canon. */
3937 t
= make_node (ARRAY_TYPE
);
3938 TREE_TYPE (t
) = elt_type
;
3939 TYPE_DOMAIN (t
) = index_type
;
3941 if (index_type
== 0)
3946 hashcode
= TYPE_HASH (elt_type
) + TYPE_HASH (index_type
);
3947 t
= type_hash_canon (hashcode
, t
);
3949 if (!COMPLETE_TYPE_P (t
))
3954 /* Return the TYPE of the elements comprising
3955 the innermost dimension of ARRAY. */
3958 get_inner_array_type (array
)
3961 tree type
= TREE_TYPE (array
);
3963 while (TREE_CODE (type
) == ARRAY_TYPE
)
3964 type
= TREE_TYPE (type
);
3969 /* Construct, lay out and return
3970 the type of functions returning type VALUE_TYPE
3971 given arguments of types ARG_TYPES.
3972 ARG_TYPES is a chain of TREE_LIST nodes whose TREE_VALUEs
3973 are data type nodes for the arguments of the function.
3974 If such a type has already been constructed, reuse it. */
3977 build_function_type (value_type
, arg_types
)
3978 tree value_type
, arg_types
;
3981 unsigned int hashcode
;
3983 if (TREE_CODE (value_type
) == FUNCTION_TYPE
)
3985 error ("function return type cannot be function");
3986 value_type
= integer_type_node
;
3989 /* Make a node of the sort we want. */
3990 t
= make_node (FUNCTION_TYPE
);
3991 TREE_TYPE (t
) = value_type
;
3992 TYPE_ARG_TYPES (t
) = arg_types
;
3994 /* If we already have such a type, use the old one and free this one. */
3995 hashcode
= TYPE_HASH (value_type
) + type_hash_list (arg_types
);
3996 t
= type_hash_canon (hashcode
, t
);
3998 if (!COMPLETE_TYPE_P (t
))
4003 /* Construct, lay out and return the type of methods belonging to class
4004 BASETYPE and whose arguments and values are described by TYPE.
4005 If that type exists already, reuse it.
4006 TYPE must be a FUNCTION_TYPE node. */
4009 build_method_type (basetype
, type
)
4010 tree basetype
, type
;
4013 unsigned int hashcode
;
4015 /* Make a node of the sort we want. */
4016 t
= make_node (METHOD_TYPE
);
4018 if (TREE_CODE (type
) != FUNCTION_TYPE
)
4021 TYPE_METHOD_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
4022 TREE_TYPE (t
) = TREE_TYPE (type
);
4024 /* The actual arglist for this function includes a "hidden" argument
4025 which is "this". Put it into the list of argument types. */
4028 = tree_cons (NULL_TREE
,
4029 build_pointer_type (basetype
), TYPE_ARG_TYPES (type
));
4031 /* If we already have such a type, use the old one and free this one. */
4032 hashcode
= TYPE_HASH (basetype
) + TYPE_HASH (type
);
4033 t
= type_hash_canon (hashcode
, t
);
4035 if (!COMPLETE_TYPE_P (t
))
4041 /* Construct, lay out and return the type of offsets to a value
4042 of type TYPE, within an object of type BASETYPE.
4043 If a suitable offset type exists already, reuse it. */
4046 build_offset_type (basetype
, type
)
4047 tree basetype
, type
;
4050 unsigned int hashcode
;
4052 /* Make a node of the sort we want. */
4053 t
= make_node (OFFSET_TYPE
);
4055 TYPE_OFFSET_BASETYPE (t
) = TYPE_MAIN_VARIANT (basetype
);
4056 TREE_TYPE (t
) = type
;
4058 /* If we already have such a type, use the old one and free this one. */
4059 hashcode
= TYPE_HASH (basetype
) + TYPE_HASH (type
);
4060 t
= type_hash_canon (hashcode
, t
);
4062 if (!COMPLETE_TYPE_P (t
))
4068 /* Create a complex type whose components are COMPONENT_TYPE. */
4071 build_complex_type (component_type
)
4072 tree component_type
;
4075 unsigned int hashcode
;
4077 /* Make a node of the sort we want. */
4078 t
= make_node (COMPLEX_TYPE
);
4080 TREE_TYPE (t
) = TYPE_MAIN_VARIANT (component_type
);
4081 set_type_quals (t
, TYPE_QUALS (component_type
));
4083 /* If we already have such a type, use the old one and free this one. */
4084 hashcode
= TYPE_HASH (component_type
);
4085 t
= type_hash_canon (hashcode
, t
);
4087 if (!COMPLETE_TYPE_P (t
))
4090 /* If we are writing Dwarf2 output we need to create a name,
4091 since complex is a fundamental type. */
4092 if (write_symbols
== DWARF2_DEBUG
&& ! TYPE_NAME (t
))
4095 if (component_type
== char_type_node
)
4096 name
= "complex char";
4097 else if (component_type
== signed_char_type_node
)
4098 name
= "complex signed char";
4099 else if (component_type
== unsigned_char_type_node
)
4100 name
= "complex unsigned char";
4101 else if (component_type
== short_integer_type_node
)
4102 name
= "complex short int";
4103 else if (component_type
== short_unsigned_type_node
)
4104 name
= "complex short unsigned int";
4105 else if (component_type
== integer_type_node
)
4106 name
= "complex int";
4107 else if (component_type
== unsigned_type_node
)
4108 name
= "complex unsigned int";
4109 else if (component_type
== long_integer_type_node
)
4110 name
= "complex long int";
4111 else if (component_type
== long_unsigned_type_node
)
4112 name
= "complex long unsigned int";
4113 else if (component_type
== long_long_integer_type_node
)
4114 name
= "complex long long int";
4115 else if (component_type
== long_long_unsigned_type_node
)
4116 name
= "complex long long unsigned int";
4121 TYPE_NAME (t
) = get_identifier (name
);
4127 /* Return OP, stripped of any conversions to wider types as much as is safe.
4128 Converting the value back to OP's type makes a value equivalent to OP.
4130 If FOR_TYPE is nonzero, we return a value which, if converted to
4131 type FOR_TYPE, would be equivalent to converting OP to type FOR_TYPE.
4133 If FOR_TYPE is nonzero, unaligned bit-field references may be changed to the
4134 narrowest type that can hold the value, even if they don't exactly fit.
4135 Otherwise, bit-field references are changed to a narrower type
4136 only if they can be fetched directly from memory in that type.
4138 OP must have integer, real or enumeral type. Pointers are not allowed!
4140 There are some cases where the obvious value we could return
4141 would regenerate to OP if converted to OP's type,
4142 but would not extend like OP to wider types.
4143 If FOR_TYPE indicates such extension is contemplated, we eschew such values.
4144 For example, if OP is (unsigned short)(signed char)-1,
4145 we avoid returning (signed char)-1 if FOR_TYPE is int,
4146 even though extending that to an unsigned short would regenerate OP,
4147 since the result of extending (signed char)-1 to (int)
4148 is different from (int) OP. */
4151 get_unwidened (op
, for_type
)
4155 /* Set UNS initially if converting OP to FOR_TYPE is a zero-extension. */
4156 register tree type
= TREE_TYPE (op
);
4157 register unsigned final_prec
4158 = TYPE_PRECISION (for_type
!= 0 ? for_type
: type
);
4160 = (for_type
!= 0 && for_type
!= type
4161 && final_prec
> TYPE_PRECISION (type
)
4162 && TREE_UNSIGNED (type
));
4163 register tree win
= op
;
4165 while (TREE_CODE (op
) == NOP_EXPR
)
4167 register int bitschange
4168 = TYPE_PRECISION (TREE_TYPE (op
))
4169 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0)));
4171 /* Truncations are many-one so cannot be removed.
4172 Unless we are later going to truncate down even farther. */
4174 && final_prec
> TYPE_PRECISION (TREE_TYPE (op
)))
4177 /* See what's inside this conversion. If we decide to strip it,
4179 op
= TREE_OPERAND (op
, 0);
4181 /* If we have not stripped any zero-extensions (uns is 0),
4182 we can strip any kind of extension.
4183 If we have previously stripped a zero-extension,
4184 only zero-extensions can safely be stripped.
4185 Any extension can be stripped if the bits it would produce
4186 are all going to be discarded later by truncating to FOR_TYPE. */
4190 if (! uns
|| final_prec
<= TYPE_PRECISION (TREE_TYPE (op
)))
4192 /* TREE_UNSIGNED says whether this is a zero-extension.
4193 Let's avoid computing it if it does not affect WIN
4194 and if UNS will not be needed again. */
4195 if ((uns
|| TREE_CODE (op
) == NOP_EXPR
)
4196 && TREE_UNSIGNED (TREE_TYPE (op
)))
4204 if (TREE_CODE (op
) == COMPONENT_REF
4205 /* Since type_for_size always gives an integer type. */
4206 && TREE_CODE (type
) != REAL_TYPE
4207 /* Don't crash if field not laid out yet. */
4208 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0
4209 && host_integerp (DECL_SIZE (TREE_OPERAND (op
, 1)), 1))
4211 unsigned int innerprec
4212 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
4214 type
= type_for_size (innerprec
, TREE_UNSIGNED (TREE_OPERAND (op
, 1)));
4216 /* We can get this structure field in the narrowest type it fits in.
4217 If FOR_TYPE is 0, do this only for a field that matches the
4218 narrower type exactly and is aligned for it
4219 The resulting extension to its nominal type (a fullword type)
4220 must fit the same conditions as for other extensions. */
4222 if (innerprec
< TYPE_PRECISION (TREE_TYPE (op
))
4223 && (for_type
|| ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1)))
4224 && (! uns
|| final_prec
<= innerprec
4225 || TREE_UNSIGNED (TREE_OPERAND (op
, 1)))
4228 win
= build (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
4229 TREE_OPERAND (op
, 1));
4230 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
4231 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
4238 /* Return OP or a simpler expression for a narrower value
4239 which can be sign-extended or zero-extended to give back OP.
4240 Store in *UNSIGNEDP_PTR either 1 if the value should be zero-extended
4241 or 0 if the value should be sign-extended. */
4244 get_narrower (op
, unsignedp_ptr
)
4248 register int uns
= 0;
4250 register tree win
= op
;
4252 while (TREE_CODE (op
) == NOP_EXPR
)
4254 register int bitschange
4255 = (TYPE_PRECISION (TREE_TYPE (op
))
4256 - TYPE_PRECISION (TREE_TYPE (TREE_OPERAND (op
, 0))));
4258 /* Truncations are many-one so cannot be removed. */
4262 /* See what's inside this conversion. If we decide to strip it,
4264 op
= TREE_OPERAND (op
, 0);
4268 /* An extension: the outermost one can be stripped,
4269 but remember whether it is zero or sign extension. */
4271 uns
= TREE_UNSIGNED (TREE_TYPE (op
));
4272 /* Otherwise, if a sign extension has been stripped,
4273 only sign extensions can now be stripped;
4274 if a zero extension has been stripped, only zero-extensions. */
4275 else if (uns
!= TREE_UNSIGNED (TREE_TYPE (op
)))
4279 else /* bitschange == 0 */
4281 /* A change in nominal type can always be stripped, but we must
4282 preserve the unsignedness. */
4284 uns
= TREE_UNSIGNED (TREE_TYPE (op
));
4291 if (TREE_CODE (op
) == COMPONENT_REF
4292 /* Since type_for_size always gives an integer type. */
4293 && TREE_CODE (TREE_TYPE (op
)) != REAL_TYPE
4294 /* Ensure field is laid out already. */
4295 && DECL_SIZE (TREE_OPERAND (op
, 1)) != 0)
4297 unsigned HOST_WIDE_INT innerprec
4298 = tree_low_cst (DECL_SIZE (TREE_OPERAND (op
, 1)), 1);
4299 tree type
= type_for_size (innerprec
, TREE_UNSIGNED (op
));
4301 /* We can get this structure field in a narrower type that fits it,
4302 but the resulting extension to its nominal type (a fullword type)
4303 must satisfy the same conditions as for other extensions.
4305 Do this only for fields that are aligned (not bit-fields),
4306 because when bit-field insns will be used there is no
4307 advantage in doing this. */
4309 if (innerprec
< TYPE_PRECISION (TREE_TYPE (op
))
4310 && ! DECL_BIT_FIELD (TREE_OPERAND (op
, 1))
4311 && (first
|| uns
== TREE_UNSIGNED (TREE_OPERAND (op
, 1)))
4315 uns
= TREE_UNSIGNED (TREE_OPERAND (op
, 1));
4316 win
= build (COMPONENT_REF
, type
, TREE_OPERAND (op
, 0),
4317 TREE_OPERAND (op
, 1));
4318 TREE_SIDE_EFFECTS (win
) = TREE_SIDE_EFFECTS (op
);
4319 TREE_THIS_VOLATILE (win
) = TREE_THIS_VOLATILE (op
);
4322 *unsignedp_ptr
= uns
;
4326 /* Nonzero if integer constant C has a value that is permissible
4327 for type TYPE (an INTEGER_TYPE). */
4330 int_fits_type_p (c
, type
)
4333 /* If the bounds of the type are integers, we can check ourselves.
4334 Otherwise,. use force_fit_type, which checks against the precision. */
4335 if (TYPE_MAX_VALUE (type
) != NULL_TREE
4336 && TYPE_MIN_VALUE (type
) != NULL_TREE
4337 && TREE_CODE (TYPE_MAX_VALUE (type
)) == INTEGER_CST
4338 && TREE_CODE (TYPE_MIN_VALUE (type
)) == INTEGER_CST
)
4340 if (TREE_UNSIGNED (type
))
4341 return (! INT_CST_LT_UNSIGNED (TYPE_MAX_VALUE (type
), c
)
4342 && ! INT_CST_LT_UNSIGNED (c
, TYPE_MIN_VALUE (type
))
4343 /* Negative ints never fit unsigned types. */
4344 && ! (TREE_INT_CST_HIGH (c
) < 0
4345 && ! TREE_UNSIGNED (TREE_TYPE (c
))));
4347 return (! INT_CST_LT (TYPE_MAX_VALUE (type
), c
)
4348 && ! INT_CST_LT (c
, TYPE_MIN_VALUE (type
))
4349 /* Unsigned ints with top bit set never fit signed types. */
4350 && ! (TREE_INT_CST_HIGH (c
) < 0
4351 && TREE_UNSIGNED (TREE_TYPE (c
))));
4356 TREE_TYPE (c
) = type
;
4357 return !force_fit_type (c
, 0);
4361 /* Given a DECL or TYPE, return the scope in which it was declared, or
4362 NULL_TREE if there is no containing scope. */
4365 get_containing_scope (t
)
4368 return (TYPE_P (t
) ? TYPE_CONTEXT (t
) : DECL_CONTEXT (t
));
4371 /* Return the innermost context enclosing DECL that is
4372 a FUNCTION_DECL, or zero if none. */
4375 decl_function_context (decl
)
4380 if (TREE_CODE (decl
) == ERROR_MARK
)
4383 if (TREE_CODE (decl
) == SAVE_EXPR
)
4384 context
= SAVE_EXPR_CONTEXT (decl
);
4386 /* C++ virtual functions use DECL_CONTEXT for the class of the vtable
4387 where we look up the function at runtime. Such functions always take
4388 a first argument of type 'pointer to real context'.
4390 C++ should really be fixed to use DECL_CONTEXT for the real context,
4391 and use something else for the "virtual context". */
4392 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_VINDEX (decl
))
4395 (TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (TREE_TYPE (decl
)))));
4397 context
= DECL_CONTEXT (decl
);
4399 while (context
&& TREE_CODE (context
) != FUNCTION_DECL
)
4401 if (TREE_CODE (context
) == BLOCK
)
4402 context
= BLOCK_SUPERCONTEXT (context
);
4404 context
= get_containing_scope (context
);
4410 /* Return the innermost context enclosing DECL that is
4411 a RECORD_TYPE, UNION_TYPE or QUAL_UNION_TYPE, or zero if none.
4412 TYPE_DECLs and FUNCTION_DECLs are transparent to this function. */
4415 decl_type_context (decl
)
4418 tree context
= DECL_CONTEXT (decl
);
4422 if (TREE_CODE (context
) == RECORD_TYPE
4423 || TREE_CODE (context
) == UNION_TYPE
4424 || TREE_CODE (context
) == QUAL_UNION_TYPE
)
4427 if (TREE_CODE (context
) == TYPE_DECL
4428 || TREE_CODE (context
) == FUNCTION_DECL
)
4429 context
= DECL_CONTEXT (context
);
4431 else if (TREE_CODE (context
) == BLOCK
)
4432 context
= BLOCK_SUPERCONTEXT (context
);
4435 /* Unhandled CONTEXT!? */
4441 /* CALL is a CALL_EXPR. Return the declaration for the function
4442 called, or NULL_TREE if the called function cannot be
4446 get_callee_fndecl (call
)
4451 /* It's invalid to call this function with anything but a
4453 if (TREE_CODE (call
) != CALL_EXPR
)
4456 /* The first operand to the CALL is the address of the function
4458 addr
= TREE_OPERAND (call
, 0);
4462 /* If this is a readonly function pointer, extract its initial value. */
4463 if (DECL_P (addr
) && TREE_CODE (addr
) != FUNCTION_DECL
4464 && TREE_READONLY (addr
) && ! TREE_THIS_VOLATILE (addr
)
4465 && DECL_INITIAL (addr
))
4466 addr
= DECL_INITIAL (addr
);
4468 /* If the address is just `&f' for some function `f', then we know
4469 that `f' is being called. */
4470 if (TREE_CODE (addr
) == ADDR_EXPR
4471 && TREE_CODE (TREE_OPERAND (addr
, 0)) == FUNCTION_DECL
)
4472 return TREE_OPERAND (addr
, 0);
4474 /* We couldn't figure out what was being called. */
4478 /* Print debugging information about the obstack O, named STR. */
4481 print_obstack_statistics (str
, o
)
4485 struct _obstack_chunk
*chunk
= o
->chunk
;
4489 n_alloc
+= o
->next_free
- chunk
->contents
;
4490 chunk
= chunk
->prev
;
4494 n_alloc
+= chunk
->limit
- &chunk
->contents
[0];
4495 chunk
= chunk
->prev
;
4497 fprintf (stderr
, "obstack %s: %u bytes, %d chunks\n",
4498 str
, n_alloc
, n_chunks
);
4501 /* Print debugging information about tree nodes generated during the compile,
4502 and any language-specific information. */
4505 dump_tree_statistics ()
4507 #ifdef GATHER_STATISTICS
4509 int total_nodes
, total_bytes
;
4512 fprintf (stderr
, "\n??? tree nodes created\n\n");
4513 #ifdef GATHER_STATISTICS
4514 fprintf (stderr
, "Kind Nodes Bytes\n");
4515 fprintf (stderr
, "-------------------------------------\n");
4516 total_nodes
= total_bytes
= 0;
4517 for (i
= 0; i
< (int) all_kinds
; i
++)
4519 fprintf (stderr
, "%-20s %6d %9d\n", tree_node_kind_names
[i
],
4520 tree_node_counts
[i
], tree_node_sizes
[i
]);
4521 total_nodes
+= tree_node_counts
[i
];
4522 total_bytes
+= tree_node_sizes
[i
];
4524 fprintf (stderr
, "%-20s %9d\n", "identifier names", id_string_size
);
4525 fprintf (stderr
, "-------------------------------------\n");
4526 fprintf (stderr
, "%-20s %6d %9d\n", "Total", total_nodes
, total_bytes
);
4527 fprintf (stderr
, "-------------------------------------\n");
4529 fprintf (stderr
, "(No per-node statistics)\n");
4531 print_obstack_statistics ("permanent_obstack", &permanent_obstack
);
4532 print_type_hash_statistics ();
4533 print_lang_statistics ();
4536 #define FILE_FUNCTION_PREFIX_LEN 9
4538 #define FILE_FUNCTION_FORMAT "_GLOBAL__%s_%s"
4540 /* Appends 6 random characters to TEMPLATE to (hopefully) avoid name
4541 clashes in cases where we can't reliably choose a unique name.
4543 Derived from mkstemp.c in libiberty. */
4546 append_random_chars (template)
4549 static const char letters
[]
4550 = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
4551 static unsigned HOST_WIDE_INT value
;
4552 unsigned HOST_WIDE_INT v
;
4554 #ifdef HAVE_GETTIMEOFDAY
4558 template += strlen (template);
4560 #ifdef HAVE_GETTIMEOFDAY
4561 /* Get some more or less random data. */
4562 gettimeofday (&tv
, NULL
);
4563 value
+= ((unsigned HOST_WIDE_INT
) tv
.tv_usec
<< 16) ^ tv
.tv_sec
^ getpid ();
4570 /* Fill in the random bits. */
4571 template[0] = letters
[v
% 62];
4573 template[1] = letters
[v
% 62];
4575 template[2] = letters
[v
% 62];
4577 template[3] = letters
[v
% 62];
4579 template[4] = letters
[v
% 62];
4581 template[5] = letters
[v
% 62];
4586 /* P is a string that will be used in a symbol. Mask out any characters
4587 that are not valid in that context. */
4590 clean_symbol_name (p
)
4595 #ifndef NO_DOLLAR_IN_LABEL /* this for `$'; unlikely, but... -- kr */
4598 #ifndef NO_DOT_IN_LABEL /* this for `.'; unlikely, but... */
4606 /* Generate a name for a function unique to this translation unit.
4607 TYPE is some string to identify the purpose of this function to the
4608 linker or collect2. */
4611 get_file_function_name_long (type
)
4618 if (first_global_object_name
)
4619 p
= first_global_object_name
;
4622 /* We don't have anything that we know to be unique to this translation
4623 unit, so use what we do have and throw in some randomness. */
4625 const char *name
= weak_global_object_name
;
4626 const char *file
= main_input_filename
;
4631 file
= input_filename
;
4633 q
= (char *) alloca (7 + strlen (name
) + strlen (file
));
4635 sprintf (q
, "%s%s", name
, file
);
4636 append_random_chars (q
);
4640 buf
= (char *) alloca (sizeof (FILE_FUNCTION_FORMAT
) + strlen (p
)
4643 /* Set up the name of the file-level functions we may need.
4644 Use a global object (which is already required to be unique over
4645 the program) rather than the file name (which imposes extra
4647 sprintf (buf
, FILE_FUNCTION_FORMAT
, type
, p
);
4649 /* Don't need to pull weird characters out of global names. */
4650 if (p
!= first_global_object_name
)
4651 clean_symbol_name (buf
+ 11);
4653 return get_identifier (buf
);
4656 /* If KIND=='I', return a suitable global initializer (constructor) name.
4657 If KIND=='D', return a suitable global clean-up (destructor) name. */
4660 get_file_function_name (kind
)
4668 return get_file_function_name_long (p
);
4671 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
4672 The result is placed in BUFFER (which has length BIT_SIZE),
4673 with one bit in each char ('\000' or '\001').
4675 If the constructor is constant, NULL_TREE is returned.
4676 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
4679 get_set_constructor_bits (init
, buffer
, bit_size
)
4686 HOST_WIDE_INT domain_min
4687 = tree_low_cst (TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (init
))), 0);
4688 tree non_const_bits
= NULL_TREE
;
4690 for (i
= 0; i
< bit_size
; i
++)
4693 for (vals
= TREE_OPERAND (init
, 1);
4694 vals
!= NULL_TREE
; vals
= TREE_CHAIN (vals
))
4696 if (!host_integerp (TREE_VALUE (vals
), 0)
4697 || (TREE_PURPOSE (vals
) != NULL_TREE
4698 && !host_integerp (TREE_PURPOSE (vals
), 0)))
4700 = tree_cons (TREE_PURPOSE (vals
), TREE_VALUE (vals
), non_const_bits
);
4701 else if (TREE_PURPOSE (vals
) != NULL_TREE
)
4703 /* Set a range of bits to ones. */
4704 HOST_WIDE_INT lo_index
4705 = tree_low_cst (TREE_PURPOSE (vals
), 0) - domain_min
;
4706 HOST_WIDE_INT hi_index
4707 = tree_low_cst (TREE_VALUE (vals
), 0) - domain_min
;
4709 if (lo_index
< 0 || lo_index
>= bit_size
4710 || hi_index
< 0 || hi_index
>= bit_size
)
4712 for (; lo_index
<= hi_index
; lo_index
++)
4713 buffer
[lo_index
] = 1;
4717 /* Set a single bit to one. */
4719 = tree_low_cst (TREE_VALUE (vals
), 0) - domain_min
;
4720 if (index
< 0 || index
>= bit_size
)
4722 error ("invalid initializer for bit string");
4728 return non_const_bits
;
4731 /* Expand (the constant part of) a SET_TYPE CONSTRUCTOR node.
4732 The result is placed in BUFFER (which is an array of bytes).
4733 If the constructor is constant, NULL_TREE is returned.
4734 Otherwise, a TREE_LIST of the non-constant elements is emitted. */
4737 get_set_constructor_bytes (init
, buffer
, wd_size
)
4739 unsigned char *buffer
;
4743 int set_word_size
= BITS_PER_UNIT
;
4744 int bit_size
= wd_size
* set_word_size
;
4746 unsigned char *bytep
= buffer
;
4747 char *bit_buffer
= (char *) alloca (bit_size
);
4748 tree non_const_bits
= get_set_constructor_bits (init
, bit_buffer
, bit_size
);
4750 for (i
= 0; i
< wd_size
; i
++)
4753 for (i
= 0; i
< bit_size
; i
++)
4757 if (BYTES_BIG_ENDIAN
)
4758 *bytep
|= (1 << (set_word_size
- 1 - bit_pos
));
4760 *bytep
|= 1 << bit_pos
;
4763 if (bit_pos
>= set_word_size
)
4764 bit_pos
= 0, bytep
++;
4766 return non_const_bits
;
4769 #if defined ENABLE_TREE_CHECKING && (GCC_VERSION >= 2007)
4770 /* Complain that the tree code of NODE does not match the expected CODE.
4771 FILE, LINE, and FUNCTION are of the caller. */
4774 tree_check_failed (node
, code
, file
, line
, function
)
4776 enum tree_code code
;
4779 const char *function
;
4781 internal_error ("Tree check: expected %s, have %s in %s, at %s:%d",
4782 tree_code_name
[code
], tree_code_name
[TREE_CODE (node
)],
4783 function
, trim_filename (file
), line
);
4786 /* Similar to above, except that we check for a class of tree
4787 code, given in CL. */
4790 tree_class_check_failed (node
, cl
, file
, line
, function
)
4795 const char *function
;
4798 ("Tree check: expected class '%c', have '%c' (%s) in %s, at %s:%d",
4799 cl
, TREE_CODE_CLASS (TREE_CODE (node
)),
4800 tree_code_name
[TREE_CODE (node
)], function
, trim_filename (file
), line
);
4803 #endif /* ENABLE_TREE_CHECKING */
4805 /* For a new vector type node T, build the information necessary for
4806 debuggint output. */
4809 finish_vector_type (t
)
4815 tree index
= build_int_2 (TYPE_VECTOR_SUBPARTS (t
) - 1, 0);
4816 tree array
= build_array_type (TREE_TYPE (t
),
4817 build_index_type (index
));
4818 tree rt
= make_node (RECORD_TYPE
);
4820 TYPE_FIELDS (rt
) = build_decl (FIELD_DECL
, get_identifier ("f"), array
);
4821 DECL_CONTEXT (TYPE_FIELDS (rt
)) = rt
;
4823 TYPE_DEBUG_REPRESENTATION_TYPE (t
) = rt
;
4824 /* In dwarfout.c, type lookup uses TYPE_UID numbers. We want to output
4825 the representation type, and we want to find that die when looking up
4826 the vector type. This is most easily achieved by making the TYPE_UID
4828 TYPE_UID (rt
) = TYPE_UID (t
);
4832 /* Create nodes for all integer types (and error_mark_node) using the sizes
4833 of C datatypes. The caller should call set_sizetype soon after calling
4834 this function to select one of the types as sizetype. */
4837 build_common_tree_nodes (signed_char
)
4840 error_mark_node
= make_node (ERROR_MARK
);
4841 TREE_TYPE (error_mark_node
) = error_mark_node
;
4843 initialize_sizetypes ();
4845 /* Define both `signed char' and `unsigned char'. */
4846 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
4847 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
4849 /* Define `char', which is like either `signed char' or `unsigned char'
4850 but not the same as either. */
4853 ? make_signed_type (CHAR_TYPE_SIZE
)
4854 : make_unsigned_type (CHAR_TYPE_SIZE
));
4856 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
4857 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
4858 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
4859 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
4860 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
4861 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
4862 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
4863 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
4865 intQI_type_node
= make_signed_type (GET_MODE_BITSIZE (QImode
));
4866 intHI_type_node
= make_signed_type (GET_MODE_BITSIZE (HImode
));
4867 intSI_type_node
= make_signed_type (GET_MODE_BITSIZE (SImode
));
4868 intDI_type_node
= make_signed_type (GET_MODE_BITSIZE (DImode
));
4869 intTI_type_node
= make_signed_type (GET_MODE_BITSIZE (TImode
));
4871 unsigned_intQI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (QImode
));
4872 unsigned_intHI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (HImode
));
4873 unsigned_intSI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (SImode
));
4874 unsigned_intDI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (DImode
));
4875 unsigned_intTI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (TImode
));
4878 /* Call this function after calling build_common_tree_nodes and set_sizetype.
4879 It will create several other common tree nodes. */
4882 build_common_tree_nodes_2 (short_double
)
4885 /* Define these next since types below may used them. */
4886 integer_zero_node
= build_int_2 (0, 0);
4887 integer_one_node
= build_int_2 (1, 0);
4888 integer_minus_one_node
= build_int_2 (-1, -1);
4890 size_zero_node
= size_int (0);
4891 size_one_node
= size_int (1);
4892 bitsize_zero_node
= bitsize_int (0);
4893 bitsize_one_node
= bitsize_int (1);
4894 bitsize_unit_node
= bitsize_int (BITS_PER_UNIT
);
4896 void_type_node
= make_node (VOID_TYPE
);
4897 layout_type (void_type_node
);
4899 /* We are not going to have real types in C with less than byte alignment,
4900 so we might as well not have any types that claim to have it. */
4901 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
4902 TYPE_USER_ALIGN (void_type_node
) = 0;
4904 null_pointer_node
= build_int_2 (0, 0);
4905 TREE_TYPE (null_pointer_node
) = build_pointer_type (void_type_node
);
4906 layout_type (TREE_TYPE (null_pointer_node
));
4908 ptr_type_node
= build_pointer_type (void_type_node
);
4910 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
4912 float_type_node
= make_node (REAL_TYPE
);
4913 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
4914 layout_type (float_type_node
);
4916 double_type_node
= make_node (REAL_TYPE
);
4918 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
4920 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
4921 layout_type (double_type_node
);
4923 long_double_type_node
= make_node (REAL_TYPE
);
4924 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
4925 layout_type (long_double_type_node
);
4927 complex_integer_type_node
= make_node (COMPLEX_TYPE
);
4928 TREE_TYPE (complex_integer_type_node
) = integer_type_node
;
4929 layout_type (complex_integer_type_node
);
4931 complex_float_type_node
= make_node (COMPLEX_TYPE
);
4932 TREE_TYPE (complex_float_type_node
) = float_type_node
;
4933 layout_type (complex_float_type_node
);
4935 complex_double_type_node
= make_node (COMPLEX_TYPE
);
4936 TREE_TYPE (complex_double_type_node
) = double_type_node
;
4937 layout_type (complex_double_type_node
);
4939 complex_long_double_type_node
= make_node (COMPLEX_TYPE
);
4940 TREE_TYPE (complex_long_double_type_node
) = long_double_type_node
;
4941 layout_type (complex_long_double_type_node
);
4945 BUILD_VA_LIST_TYPE (t
);
4947 /* Many back-ends define record types without seting TYPE_NAME.
4948 If we copied the record type here, we'd keep the original
4949 record type without a name. This breaks name mangling. So,
4950 don't copy record types and let c_common_nodes_and_builtins()
4951 declare the type to be __builtin_va_list. */
4952 if (TREE_CODE (t
) != RECORD_TYPE
)
4953 t
= build_type_copy (t
);
4955 va_list_type_node
= t
;
4958 V4SF_type_node
= make_node (VECTOR_TYPE
);
4959 TREE_TYPE (V4SF_type_node
) = float_type_node
;
4960 TYPE_MODE (V4SF_type_node
) = V4SFmode
;
4961 finish_vector_type (V4SF_type_node
);
4963 V4SI_type_node
= make_node (VECTOR_TYPE
);
4964 TREE_TYPE (V4SI_type_node
) = intSI_type_node
;
4965 TYPE_MODE (V4SI_type_node
) = V4SImode
;
4966 finish_vector_type (V4SI_type_node
);
4968 V2SI_type_node
= make_node (VECTOR_TYPE
);
4969 TREE_TYPE (V2SI_type_node
) = intSI_type_node
;
4970 TYPE_MODE (V2SI_type_node
) = V2SImode
;
4971 finish_vector_type (V2SI_type_node
);
4973 V4HI_type_node
= make_node (VECTOR_TYPE
);
4974 TREE_TYPE (V4HI_type_node
) = intHI_type_node
;
4975 TYPE_MODE (V4HI_type_node
) = V4HImode
;
4976 finish_vector_type (V4HI_type_node
);
4978 V8QI_type_node
= make_node (VECTOR_TYPE
);
4979 TREE_TYPE (V8QI_type_node
) = intQI_type_node
;
4980 TYPE_MODE (V8QI_type_node
) = V8QImode
;
4981 finish_vector_type (V8QI_type_node
);