1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
24 /* This file handles generation of all the assembler code
25 *except* the instructions of a function.
26 This includes declarations of variables and their initial values.
28 We also output the assembler code for constants stored in memory
29 and are responsible for combining constants with the same value. */
33 #include "coretypes.h"
40 #include "hard-reg-set.h"
48 #include "langhooks.h"
52 #include "tree-mudflap.h"
54 #include "cfglayout.h"
55 #include "basic-block.h"
56 #include "tree-iterator.h"
58 #ifdef XCOFF_DEBUGGING_INFO
59 #include "xcoffout.h" /* Needed for external data
60 declarations for e.g. AIX 4.x. */
63 /* The (assembler) name of the first globally-visible object output. */
64 extern GTY(()) const char *first_global_object_name
;
65 extern GTY(()) const char *weak_global_object_name
;
67 const char *first_global_object_name
;
68 const char *weak_global_object_name
;
71 struct constant_descriptor_rtx
;
72 struct rtx_constant_pool
;
74 struct varasm_status
GTY(())
76 /* If we're using a per-function constant pool, this is it. */
77 struct rtx_constant_pool
*pool
;
79 /* Number of tree-constants deferred during the expansion of this
81 unsigned int deferred_constants
;
84 #define n_deferred_constants (cfun->varasm->deferred_constants)
86 /* Number for making the label on the next
87 constant that is stored in memory. */
89 static GTY(()) int const_labelno
;
91 /* Carry information from ASM_DECLARE_OBJECT_NAME
92 to ASM_FINISH_DECLARE_OBJECT. */
94 int size_directive_output
;
96 /* The last decl for which assemble_variable was called,
97 if it did ASM_DECLARE_OBJECT_NAME.
98 If the last call to assemble_variable didn't do that,
101 tree last_assemble_variable_decl
;
103 /* The following global variable indicates if the first basic block
104 in a function belongs to the cold partition or not. */
106 bool first_function_block_is_cold
;
108 /* We give all constants their own alias set. Perhaps redundant with
109 MEM_READONLY_P, but pre-dates it. */
111 static HOST_WIDE_INT const_alias_set
;
113 static const char *strip_reg_name (const char *);
114 static int contains_pointers_p (tree
);
115 #ifdef ASM_OUTPUT_EXTERNAL
116 static bool incorporeal_function_p (tree
);
118 static void decode_addr_const (tree
, struct addr_const
*);
119 static hashval_t
const_desc_hash (const void *);
120 static int const_desc_eq (const void *, const void *);
121 static hashval_t
const_hash_1 (const tree
);
122 static int compare_constant (const tree
, const tree
);
123 static tree
copy_constant (tree
);
124 static void output_constant_def_contents (rtx
);
125 static void output_addressed_constants (tree
);
126 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
127 static unsigned min_align (unsigned, unsigned);
128 static void output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int);
129 static void globalize_decl (tree
);
130 #ifdef BSS_SECTION_ASM_OP
131 #ifdef ASM_OUTPUT_BSS
132 static void asm_output_bss (FILE *, tree
, const char *,
133 unsigned HOST_WIDE_INT
, unsigned HOST_WIDE_INT
);
135 #ifdef ASM_OUTPUT_ALIGNED_BSS
136 static void asm_output_aligned_bss (FILE *, tree
, const char *,
137 unsigned HOST_WIDE_INT
, int)
140 #endif /* BSS_SECTION_ASM_OP */
141 static void mark_weak (tree
);
142 static void output_constant_pool (const char *, tree
);
144 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
145 section
*text_section
;
146 section
*data_section
;
147 section
*readonly_data_section
;
148 section
*sdata_section
;
149 section
*ctors_section
;
150 section
*dtors_section
;
151 section
*bss_section
;
152 section
*sbss_section
;
154 /* Various forms of common section. All are guaranteed to be nonnull. */
155 section
*tls_comm_section
;
156 section
*comm_section
;
157 section
*lcomm_section
;
159 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
161 section
*bss_noswitch_section
;
163 /* The section that holds the main exception table, when known. The section
164 is set either by the target's init_sections hook or by the first call to
165 switch_to_exception_section. */
166 section
*exception_section
;
168 /* The section that holds the DWARF2 frame unwind information, when known.
169 The section is set either by the target's init_sections hook or by the
170 first call to switch_to_eh_frame_section. */
171 section
*eh_frame_section
;
173 /* asm_out_file's current section. This is NULL if no section has yet
174 been selected or if we lose track of what the current section is. */
177 /* True if code for the current function is currently being directed
178 at the cold section. */
179 bool in_cold_section_p
;
181 /* A linked list of all the unnamed sections. */
182 static GTY(()) section
*unnamed_sections
;
184 /* Return a nonzero value if DECL has a section attribute. */
185 #ifndef IN_NAMED_SECTION
186 #define IN_NAMED_SECTION(DECL) \
187 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
188 && DECL_SECTION_NAME (DECL) != NULL_TREE)
191 /* Hash table of named sections. */
192 static GTY((param_is (section
))) htab_t section_htab
;
194 /* A table of object_blocks, indexed by section. */
195 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
197 /* The next number to use for internal anchor labels. */
198 static GTY(()) int anchor_labelno
;
200 /* A pool of constants that can be shared between functions. */
201 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
205 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
207 static GTY (()) tree emutls_object_type
;
209 #ifndef NO_DOT_IN_LABEL
210 # define EMUTLS_VAR_PREFIX "__emutls_v."
211 # define EMUTLS_TMPL_PREFIX "__emutls_t."
212 #elif !defined NO_DOLLAR_IN_LABEL
213 # define EMUTLS_VAR_PREFIX "__emutls_v$"
214 # define EMUTLS_TMPL_PREFIX "__emutls_t$"
216 # define EMUTLS_VAR_PREFIX "__emutls_v_"
217 # define EMUTLS_TMPL_PREFIX "__emutls_t_"
220 /* Create an identifier for the struct __emutls_object, given an identifier
221 of the DECL_ASSEMBLY_NAME of the original object. */
224 get_emutls_object_name (tree name
)
226 char *toname
= alloca (strlen (IDENTIFIER_POINTER (name
))
227 + sizeof (EMUTLS_VAR_PREFIX
));
228 strcpy (toname
, EMUTLS_VAR_PREFIX
);
229 strcpy (toname
+ sizeof (EMUTLS_VAR_PREFIX
) - 1, IDENTIFIER_POINTER (name
));
231 return get_identifier (toname
);
234 /* Create the structure for struct __emutls_object. This should match the
235 structure at the top of emutls.c, modulo the union there. */
238 get_emutls_object_type (void)
240 tree type
, type_name
, field
, next_field
, word_type_node
;
242 type
= emutls_object_type
;
246 emutls_object_type
= type
= lang_hooks
.types
.make_type (RECORD_TYPE
);
247 type_name
= get_identifier ("__emutls_object");
248 type_name
= build_decl (TYPE_DECL
, type_name
, type
);
249 TYPE_NAME (type
) = type_name
;
251 field
= build_decl (FIELD_DECL
, get_identifier ("__templ"), ptr_type_node
);
252 DECL_CONTEXT (field
) = type
;
255 field
= build_decl (FIELD_DECL
, get_identifier ("__offset"), ptr_type_node
);
256 DECL_CONTEXT (field
) = type
;
257 TREE_CHAIN (field
) = next_field
;
260 word_type_node
= lang_hooks
.types
.type_for_mode (word_mode
, 1);
261 field
= build_decl (FIELD_DECL
, get_identifier ("__align"), word_type_node
);
262 DECL_CONTEXT (field
) = type
;
263 TREE_CHAIN (field
) = next_field
;
266 field
= build_decl (FIELD_DECL
, get_identifier ("__size"), word_type_node
);
267 DECL_CONTEXT (field
) = type
;
268 TREE_CHAIN (field
) = next_field
;
270 TYPE_FIELDS (type
) = field
;
276 /* Create a read-only variable like DECL, with the same DECL_INITIAL.
277 This will be used for initializing the emulated tls data area. */
280 get_emutls_init_templ_addr (tree decl
)
285 if (!DECL_INITIAL (decl
))
286 return null_pointer_node
;
288 name
= DECL_ASSEMBLER_NAME (decl
);
289 toname
= alloca (strlen (IDENTIFIER_POINTER (name
))
290 + sizeof (EMUTLS_TMPL_PREFIX
));
291 strcpy (toname
, EMUTLS_TMPL_PREFIX
);
292 strcpy (toname
+ sizeof (EMUTLS_TMPL_PREFIX
) - 1, IDENTIFIER_POINTER (name
));
293 name
= get_identifier (toname
);
295 to
= build_decl (VAR_DECL
, name
, TREE_TYPE (decl
));
296 SET_DECL_ASSEMBLER_NAME (to
, DECL_NAME (to
));
298 DECL_ARTIFICIAL (to
) = 1;
299 TREE_USED (to
) = TREE_USED (decl
);
300 TREE_READONLY (to
) = 1;
301 DECL_IGNORED_P (to
) = 1;
302 DECL_CONTEXT (to
) = DECL_CONTEXT (decl
);
303 DECL_WEAK (to
) = DECL_WEAK (decl
);
304 if (DECL_ONE_ONLY (decl
))
306 make_decl_one_only (to
);
307 TREE_STATIC (to
) = TREE_STATIC (decl
);
308 TREE_PUBLIC (to
) = TREE_PUBLIC (decl
);
309 DECL_VISIBILITY (to
) = DECL_VISIBILITY (decl
);
312 TREE_STATIC (to
) = 1;
314 DECL_INITIAL (to
) = DECL_INITIAL (decl
);
315 DECL_INITIAL (decl
) = NULL
;
317 varpool_finalize_decl (to
);
318 return build_fold_addr_expr (to
);
321 /* When emulating tls, we use a control structure for use by the runtime.
322 Create and return this structure. */
325 emutls_decl (tree decl
)
328 struct tree_map
*h
, in
;
331 if (targetm
.have_tls
|| decl
== NULL
|| decl
== error_mark_node
332 || TREE_CODE (decl
) != VAR_DECL
|| ! DECL_THREAD_LOCAL_P (decl
))
335 /* Look up the object in the hash; return the control structure if
336 it has already been created. */
338 emutls_htab
= htab_create_ggc (512, tree_map_hash
, tree_map_eq
, 0);
340 name
= DECL_ASSEMBLER_NAME (decl
);
342 /* Note that we use the hash of the decl's name, rather than a hash
343 of the decl's pointer. In emutls_finish we iterate through the
344 hash table, and we want this traversal to be predictable. */
345 in
.hash
= htab_hash_string (IDENTIFIER_POINTER (name
));
347 loc
= htab_find_slot_with_hash (emutls_htab
, &in
, in
.hash
, INSERT
);
353 to
= build_decl (VAR_DECL
, get_emutls_object_name (name
),
354 get_emutls_object_type ());
356 h
= ggc_alloc (sizeof (struct tree_map
));
360 *(struct tree_map
**) loc
= h
;
362 DECL_ARTIFICIAL (to
) = 1;
363 DECL_IGNORED_P (to
) = 1;
364 TREE_READONLY (to
) = 0;
366 SET_DECL_ASSEMBLER_NAME (to
, DECL_NAME (to
));
367 if (DECL_ONE_ONLY (decl
))
368 make_decl_one_only (to
);
369 DECL_CONTEXT (to
) = DECL_CONTEXT (decl
);
372 /* Note that these fields may need to be updated from time to time from
373 the original decl. Consider:
374 extern __thread int i;
375 int foo() { return i; }
377 in which I goes from external to locally defined and initialized. */
379 TREE_STATIC (to
) = TREE_STATIC (decl
);
380 TREE_USED (to
) = TREE_USED (decl
);
381 TREE_PUBLIC (to
) = TREE_PUBLIC (decl
);
382 DECL_EXTERNAL (to
) = DECL_EXTERNAL (decl
);
383 DECL_COMMON (to
) = DECL_COMMON (decl
);
384 DECL_WEAK (to
) = DECL_WEAK (decl
);
385 DECL_VISIBILITY (to
) = DECL_VISIBILITY (decl
);
391 emutls_common_1 (void **loc
, void *xstmts
)
393 struct tree_map
*h
= *(struct tree_map
**) loc
;
394 tree args
, x
, *pstmts
= (tree
*) xstmts
;
397 if (! DECL_COMMON (h
->base
.from
)
398 || (DECL_INITIAL (h
->base
.from
)
399 && DECL_INITIAL (h
->base
.from
) != error_mark_node
))
402 word_type_node
= lang_hooks
.types
.type_for_mode (word_mode
, 1);
404 /* The idea was to call get_emutls_init_templ_addr here, but if we
405 do this and there is an initializer, -fanchor_section loses,
406 because it would be too late to ensure the template is
408 x
= null_pointer_node
;
409 args
= tree_cons (NULL
, x
, NULL
);
410 x
= build_int_cst (word_type_node
, DECL_ALIGN_UNIT (h
->base
.from
));
411 args
= tree_cons (NULL
, x
, args
);
412 x
= fold_convert (word_type_node
, DECL_SIZE_UNIT (h
->base
.from
));
413 args
= tree_cons (NULL
, x
, args
);
414 x
= build_fold_addr_expr (h
->to
);
415 args
= tree_cons (NULL
, x
, args
);
417 x
= built_in_decls
[BUILT_IN_EMUTLS_REGISTER_COMMON
];
418 x
= build_function_call_expr (x
, args
);
420 append_to_statement_list (x
, pstmts
);
427 tree body
= NULL_TREE
;
429 if (emutls_htab
== NULL
)
432 htab_traverse_noresize (emutls_htab
, emutls_common_1
, &body
);
433 if (body
== NULL_TREE
)
436 cgraph_build_static_cdtor ('I', body
, DEFAULT_INIT_PRIORITY
);
439 /* Helper routines for maintaining section_htab. */
442 section_entry_eq (const void *p1
, const void *p2
)
444 const section
*old
= p1
;
445 const char *new = p2
;
447 return strcmp (old
->named
.name
, new) == 0;
451 section_entry_hash (const void *p
)
453 const section
*old
= p
;
454 return htab_hash_string (old
->named
.name
);
457 /* Return a hash value for section SECT. */
460 hash_section (section
*sect
)
462 if (sect
->common
.flags
& SECTION_NAMED
)
463 return htab_hash_string (sect
->named
.name
);
464 return sect
->common
.flags
;
467 /* Helper routines for maintaining object_block_htab. */
470 object_block_entry_eq (const void *p1
, const void *p2
)
472 const struct object_block
*old
= p1
;
473 const section
*new = p2
;
475 return old
->sect
== new;
479 object_block_entry_hash (const void *p
)
481 const struct object_block
*old
= p
;
482 return hash_section (old
->sect
);
485 /* Return a new unnamed section with the given fields. */
488 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
493 sect
= ggc_alloc (sizeof (struct unnamed_section
));
494 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
495 sect
->unnamed
.callback
= callback
;
496 sect
->unnamed
.data
= data
;
497 sect
->unnamed
.next
= unnamed_sections
;
499 unnamed_sections
= sect
;
503 /* Return a SECTION_NOSWITCH section with the given fields. */
506 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
510 sect
= ggc_alloc (sizeof (struct unnamed_section
));
511 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
512 sect
->noswitch
.callback
= callback
;
517 /* Return the named section structure associated with NAME. Create
518 a new section with the given fields if no such structure exists. */
521 get_section (const char *name
, unsigned int flags
, tree decl
)
523 section
*sect
, **slot
;
526 htab_find_slot_with_hash (section_htab
, name
,
527 htab_hash_string (name
), INSERT
);
528 flags
|= SECTION_NAMED
;
531 sect
= ggc_alloc (sizeof (struct named_section
));
532 sect
->named
.common
.flags
= flags
;
533 sect
->named
.name
= ggc_strdup (name
);
534 sect
->named
.decl
= decl
;
540 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
541 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
543 /* Sanity check user variables for flag changes. */
545 decl
= sect
->named
.decl
;
547 error ("%+D causes a section type conflict", decl
);
553 /* Return true if the current compilation mode benefits from having
554 objects grouped into blocks. */
557 use_object_blocks_p (void)
559 return flag_section_anchors
;
562 /* Return the object_block structure for section SECT. Create a new
563 structure if we haven't created one already. Return null if SECT
566 static struct object_block
*
567 get_block_for_section (section
*sect
)
569 struct object_block
*block
;
575 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
576 hash_section (sect
), INSERT
);
577 block
= (struct object_block
*) *slot
;
580 block
= (struct object_block
*)
581 ggc_alloc_cleared (sizeof (struct object_block
));
588 /* Create a symbol with label LABEL and place it at byte offset
589 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
590 is not yet known. LABEL must be a garbage-collected string. */
593 create_block_symbol (const char *label
, struct object_block
*block
,
594 HOST_WIDE_INT offset
)
599 /* Create the extended SYMBOL_REF. */
600 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
601 symbol
= ggc_alloc_zone (size
, &rtl_zone
);
603 /* Initialize the normal SYMBOL_REF fields. */
604 memset (symbol
, 0, size
);
605 PUT_CODE (symbol
, SYMBOL_REF
);
606 PUT_MODE (symbol
, Pmode
);
607 XSTR (symbol
, 0) = label
;
608 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
610 /* Initialize the block_symbol stuff. */
611 SYMBOL_REF_BLOCK (symbol
) = block
;
612 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
618 initialize_cold_section_name (void)
620 const char *stripped_name
;
624 gcc_assert (cfun
&& current_function_decl
);
625 if (cfun
->unlikely_text_section_name
)
628 dsn
= DECL_SECTION_NAME (current_function_decl
);
629 if (flag_function_sections
&& dsn
)
631 name
= alloca (TREE_STRING_LENGTH (dsn
) + 1);
632 memcpy (name
, TREE_STRING_POINTER (dsn
), TREE_STRING_LENGTH (dsn
) + 1);
634 stripped_name
= targetm
.strip_name_encoding (name
);
636 buffer
= ACONCAT ((stripped_name
, "_unlikely", NULL
));
637 cfun
->unlikely_text_section_name
= ggc_strdup (buffer
);
640 cfun
->unlikely_text_section_name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
643 /* Tell assembler to switch to unlikely-to-be-executed text section. */
646 unlikely_text_section (void)
650 if (!cfun
->unlikely_text_section_name
)
651 initialize_cold_section_name ();
653 return get_named_section (NULL
, cfun
->unlikely_text_section_name
, 0);
656 return get_named_section (NULL
, UNLIKELY_EXECUTED_TEXT_SECTION_NAME
, 0);
659 /* When called within a function context, return true if the function
660 has been assigned a cold text section and if SECT is that section.
661 When called outside a function context, return true if SECT is the
662 default cold section. */
665 unlikely_text_section_p (section
*sect
)
670 name
= cfun
->unlikely_text_section_name
;
672 name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
676 && SECTION_STYLE (sect
) == SECTION_NAMED
677 && strcmp (name
, sect
->named
.name
) == 0);
680 /* Return a section with a particular name and with whatever SECTION_*
681 flags section_type_flags deems appropriate. The name of the section
682 is taken from NAME if nonnull, otherwise it is taken from DECL's
683 DECL_SECTION_NAME. DECL is the decl associated with the section
684 (see the section comment for details) and RELOC is as for
685 section_type_flags. */
688 get_named_section (tree decl
, const char *name
, int reloc
)
692 gcc_assert (!decl
|| DECL_P (decl
));
694 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
696 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
698 return get_section (name
, flags
, decl
);
701 /* If required, set DECL_SECTION_NAME to a unique name. */
704 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
705 int flag_function_or_data_sections
)
707 if (DECL_SECTION_NAME (decl
) == NULL_TREE
708 && targetm
.have_named_sections
709 && (flag_function_or_data_sections
710 || DECL_ONE_ONLY (decl
)))
711 targetm
.asm_out
.unique_section (decl
, reloc
);
714 #ifdef BSS_SECTION_ASM_OP
716 #ifdef ASM_OUTPUT_BSS
718 /* Utility function for ASM_OUTPUT_BSS for targets to use if
719 they don't support alignments in .bss.
720 ??? It is believed that this function will work in most cases so such
721 support is localized here. */
724 asm_output_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
726 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
727 unsigned HOST_WIDE_INT rounded
)
729 gcc_assert (strcmp (XSTR (XEXP (DECL_RTL (decl
), 0), 0), name
) == 0);
730 targetm
.asm_out
.globalize_decl_name (file
, decl
);
731 switch_to_section (bss_section
);
732 #ifdef ASM_DECLARE_OBJECT_NAME
733 last_assemble_variable_decl
= decl
;
734 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
736 /* Standard thing is just output label for the object. */
737 ASM_OUTPUT_LABEL (file
, name
);
738 #endif /* ASM_DECLARE_OBJECT_NAME */
739 ASM_OUTPUT_SKIP (file
, rounded
? rounded
: 1);
744 #ifdef ASM_OUTPUT_ALIGNED_BSS
746 /* Utility function for targets to use in implementing
747 ASM_OUTPUT_ALIGNED_BSS.
748 ??? It is believed that this function will work in most cases so such
749 support is localized here. */
752 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
753 const char *name
, unsigned HOST_WIDE_INT size
,
756 switch_to_section (bss_section
);
757 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
758 #ifdef ASM_DECLARE_OBJECT_NAME
759 last_assemble_variable_decl
= decl
;
760 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
762 /* Standard thing is just output label for the object. */
763 ASM_OUTPUT_LABEL (file
, name
);
764 #endif /* ASM_DECLARE_OBJECT_NAME */
765 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
770 #endif /* BSS_SECTION_ASM_OP */
772 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
773 /* Return the hot section for function DECL. Return text_section for
777 hot_function_section (tree decl
)
779 if (decl
!= NULL_TREE
780 && DECL_SECTION_NAME (decl
) != NULL_TREE
781 && targetm
.have_named_sections
)
782 return get_named_section (decl
, NULL
, 0);
788 /* Return the section for function DECL.
790 If DECL is NULL_TREE, return the text section. We can be passed
791 NULL_TREE under some circumstances by dbxout.c at least. */
794 function_section (tree decl
)
798 if (first_function_block_is_cold
)
801 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
802 if (decl
!= NULL_TREE
803 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
804 return reloc
? unlikely_text_section ()
805 : get_named_section (decl
, NULL
, 0);
807 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
809 return reloc
? unlikely_text_section () : hot_function_section (decl
);
814 current_function_section (void)
816 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
817 if (current_function_decl
!= NULL_TREE
818 && DECL_SECTION_NAME (current_function_decl
) != NULL_TREE
)
819 return in_cold_section_p
? unlikely_text_section ()
820 : get_named_section (current_function_decl
,
823 return targetm
.asm_out
.select_section (current_function_decl
,
825 DECL_ALIGN (current_function_decl
));
827 return (in_cold_section_p
828 ? unlikely_text_section ()
829 : hot_function_section (current_function_decl
));
833 /* Return the read-only data section associated with function DECL. */
836 default_function_rodata_section (tree decl
)
838 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
840 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
842 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
844 size_t len
= strlen (name
) + 3;
845 char* rname
= alloca (len
);
847 strcpy (rname
, ".rodata");
848 strcat (rname
, name
+ 5);
849 return get_section (rname
, SECTION_LINKONCE
, decl
);
851 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
852 else if (DECL_ONE_ONLY (decl
)
853 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
855 size_t len
= strlen (name
) + 1;
856 char *rname
= alloca (len
);
858 memcpy (rname
, name
, len
);
860 return get_section (rname
, SECTION_LINKONCE
, decl
);
862 /* For .text.foo we want to use .rodata.foo. */
863 else if (flag_function_sections
&& flag_data_sections
864 && strncmp (name
, ".text.", 6) == 0)
866 size_t len
= strlen (name
) + 1;
867 char *rname
= alloca (len
+ 2);
869 memcpy (rname
, ".rodata", 7);
870 memcpy (rname
+ 7, name
+ 5, len
- 5);
871 return get_section (rname
, 0, decl
);
875 return readonly_data_section
;
878 /* Return the read-only data section associated with function DECL
879 for targets where that section should be always the single
880 readonly data section. */
883 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
885 return readonly_data_section
;
888 /* Return the section to use for string merging. */
891 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
892 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
893 unsigned int flags ATTRIBUTE_UNUSED
)
897 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
898 && TREE_CODE (decl
) == STRING_CST
899 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
901 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
902 && TREE_STRING_LENGTH (decl
) >= len
)
904 enum machine_mode mode
;
905 unsigned int modesize
;
911 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
912 modesize
= GET_MODE_BITSIZE (mode
);
913 if (modesize
>= 8 && modesize
<= 256
914 && (modesize
& (modesize
- 1)) == 0)
916 if (align
< modesize
)
919 str
= TREE_STRING_POINTER (decl
);
920 unit
= GET_MODE_SIZE (mode
);
922 /* Check for embedded NUL characters. */
923 for (i
= 0; i
< len
; i
+= unit
)
925 for (j
= 0; j
< unit
; j
++)
926 if (str
[i
+ j
] != '\0')
933 sprintf (name
, ".rodata.str%d.%d", modesize
/ 8,
935 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
936 return get_section (name
, flags
, NULL
);
941 return readonly_data_section
;
944 /* Return the section to use for constant merging. */
947 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
948 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
949 unsigned int flags ATTRIBUTE_UNUSED
)
951 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
953 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
959 && (align
& (align
- 1)) == 0)
963 sprintf (name
, ".rodata.cst%d", (int) (align
/ 8));
964 flags
|= (align
/ 8) | SECTION_MERGE
;
965 return get_section (name
, flags
, NULL
);
967 return readonly_data_section
;
970 /* Given NAME, a putative register name, discard any customary prefixes. */
973 strip_reg_name (const char *name
)
975 #ifdef REGISTER_PREFIX
976 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
977 name
+= strlen (REGISTER_PREFIX
);
979 if (name
[0] == '%' || name
[0] == '#')
984 /* The user has asked for a DECL to have a particular name. Set (or
985 change) it in such a way that we don't prefix an underscore to
988 set_user_assembler_name (tree decl
, const char *name
)
990 char *starred
= alloca (strlen (name
) + 2);
992 strcpy (starred
+ 1, name
);
993 change_decl_assembler_name (decl
, get_identifier (starred
));
994 SET_DECL_RTL (decl
, NULL_RTX
);
997 /* Decode an `asm' spec for a declaration as a register name.
998 Return the register number, or -1 if nothing specified,
999 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
1000 or -3 if ASMSPEC is `cc' and is not recognized,
1001 or -4 if ASMSPEC is `memory' and is not recognized.
1002 Accept an exact spelling or a decimal number.
1003 Prefixes such as % are optional. */
1006 decode_reg_name (const char *asmspec
)
1012 /* Get rid of confusing prefixes. */
1013 asmspec
= strip_reg_name (asmspec
);
1015 /* Allow a decimal number as a "register name". */
1016 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
1017 if (! ISDIGIT (asmspec
[i
]))
1019 if (asmspec
[0] != 0 && i
< 0)
1022 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
1028 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
1030 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
1033 #ifdef ADDITIONAL_REGISTER_NAMES
1035 static const struct { const char *const name
; const int number
; } table
[]
1036 = ADDITIONAL_REGISTER_NAMES
;
1038 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
1039 if (table
[i
].name
[0]
1040 && ! strcmp (asmspec
, table
[i
].name
))
1041 return table
[i
].number
;
1043 #endif /* ADDITIONAL_REGISTER_NAMES */
1045 if (!strcmp (asmspec
, "memory"))
1048 if (!strcmp (asmspec
, "cc"))
1057 /* Return true if DECL's initializer is suitable for a BSS section. */
1060 bss_initializer_p (tree decl
)
1062 return (DECL_INITIAL (decl
) == NULL
1063 || DECL_INITIAL (decl
) == error_mark_node
1064 || (flag_zero_initialized_in_bss
1065 /* Leave constant zeroes in .rodata so they
1067 && !TREE_READONLY (decl
)
1068 && initializer_zerop (DECL_INITIAL (decl
))));
1071 /* Compute the alignment of variable specified by DECL.
1072 DONT_OUTPUT_DATA is from assemble_variable. */
1075 align_variable (tree decl
, bool dont_output_data
)
1077 unsigned int align
= DECL_ALIGN (decl
);
1079 /* In the case for initialing an array whose length isn't specified,
1080 where we have not yet been able to do the layout,
1081 figure out the proper alignment now. */
1082 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1083 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1084 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1086 /* Some object file formats have a maximum alignment which they support.
1087 In particular, a.out format supports a maximum alignment of 4. */
1088 if (align
> MAX_OFILE_ALIGNMENT
)
1090 warning (0, "alignment of %q+D is greater than maximum object "
1091 "file alignment. Using %d", decl
,
1092 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1093 align
= MAX_OFILE_ALIGNMENT
;
1096 /* On some machines, it is good to increase alignment sometimes. */
1097 if (! DECL_USER_ALIGN (decl
))
1099 #ifdef DATA_ALIGNMENT
1100 align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1102 #ifdef CONSTANT_ALIGNMENT
1103 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
1104 align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1108 /* Reset the alignment in case we have made it tighter, so we can benefit
1109 from it in get_pointer_alignment. */
1110 DECL_ALIGN (decl
) = align
;
1113 /* Return the section into which the given VAR_DECL or CONST_DECL
1114 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1115 section should be used wherever possible. */
1118 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1122 /* If the decl has been given an explicit section name, then it
1123 isn't common, and shouldn't be handled as such. */
1124 if (DECL_COMMON (decl
) && DECL_SECTION_NAME (decl
) == NULL
)
1126 if (DECL_THREAD_LOCAL_P (decl
))
1127 return tls_comm_section
;
1128 if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1129 return comm_section
;
1132 if (DECL_INITIAL (decl
) == error_mark_node
)
1133 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1134 else if (DECL_INITIAL (decl
))
1135 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1139 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1140 if (IN_NAMED_SECTION (decl
))
1141 return get_named_section (decl
, NULL
, reloc
);
1143 if (!DECL_THREAD_LOCAL_P (decl
)
1144 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1145 && bss_initializer_p (decl
))
1147 if (!TREE_PUBLIC (decl
))
1148 return lcomm_section
;
1149 if (bss_noswitch_section
)
1150 return bss_noswitch_section
;
1153 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1156 /* Return the block into which object_block DECL should be placed. */
1158 static struct object_block
*
1159 get_block_for_decl (tree decl
)
1163 if (TREE_CODE (decl
) == VAR_DECL
)
1165 /* The object must be defined in this translation unit. */
1166 if (DECL_EXTERNAL (decl
))
1169 /* There's no point using object blocks for something that is
1170 isolated by definition. */
1171 if (DECL_ONE_ONLY (decl
))
1175 /* We can only calculate block offsets if the decl has a known
1177 if (DECL_SIZE_UNIT (decl
) == NULL
)
1179 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1182 /* Find out which section should contain DECL. We cannot put it into
1183 an object block if it requires a standalone definition. */
1184 if (TREE_CODE (decl
) == VAR_DECL
)
1185 align_variable (decl
, 0);
1186 sect
= get_variable_section (decl
, true);
1187 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1190 return get_block_for_section (sect
);
1193 /* Make sure block symbol SYMBOL is in block BLOCK. */
1196 change_symbol_block (rtx symbol
, struct object_block
*block
)
1198 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1200 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1201 SYMBOL_REF_BLOCK (symbol
) = block
;
1205 /* Return true if it is possible to put DECL in an object_block. */
1208 use_blocks_for_decl_p (tree decl
)
1210 /* Only data DECLs can be placed into object blocks. */
1211 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1214 /* Detect decls created by dw2_force_const_mem. Such decls are
1215 special because DECL_INITIAL doesn't specify the decl's true value.
1216 dw2_output_indirect_constants will instead call assemble_variable
1217 with dont_output_data set to 1 and then print the contents itself. */
1218 if (DECL_INITIAL (decl
) == decl
)
1221 /* If this decl is an alias, then we don't want to emit a definition. */
1222 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1228 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1229 have static storage duration. In other words, it should not be an
1230 automatic variable, including PARM_DECLs.
1232 There is, however, one exception: this function handles variables
1233 explicitly placed in a particular register by the user.
1235 This is never called for PARM_DECL nodes. */
1238 make_decl_rtl (tree decl
)
1240 const char *name
= 0;
1244 /* Check that we are not being given an automatic variable. */
1245 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1246 && TREE_CODE (decl
) != RESULT_DECL
);
1248 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1249 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1250 || TREE_STATIC (decl
)
1251 || TREE_PUBLIC (decl
)
1252 || DECL_EXTERNAL (decl
)
1253 || DECL_REGISTER (decl
));
1255 /* And that we were not given a type or a label. */
1256 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1257 && TREE_CODE (decl
) != LABEL_DECL
);
1259 /* For a duplicate declaration, we can be called twice on the
1260 same DECL node. Don't discard the RTL already made. */
1261 if (DECL_RTL_SET_P (decl
))
1263 /* If the old RTL had the wrong mode, fix the mode. */
1264 x
= DECL_RTL (decl
);
1265 if (GET_MODE (x
) != DECL_MODE (decl
))
1266 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1268 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1271 /* ??? Another way to do this would be to maintain a hashed
1272 table of such critters. Instead of adding stuff to a DECL
1273 to give certain attributes to it, we could use an external
1274 hash map from DECL to set of attributes. */
1276 /* Let the target reassign the RTL if it wants.
1277 This is necessary, for example, when one machine specific
1278 decl attribute overrides another. */
1279 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1281 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1282 on the new decl information. */
1284 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1285 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1286 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1288 /* Make this function static known to the mudflap runtime. */
1289 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1290 mudflap_enqueue_decl (decl
);
1295 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1297 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1298 && DECL_REGISTER (decl
))
1300 error ("register name not specified for %q+D", decl
);
1302 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1304 const char *asmspec
= name
+1;
1305 reg_number
= decode_reg_name (asmspec
);
1306 /* First detect errors in declaring global registers. */
1307 if (reg_number
== -1)
1308 error ("register name not specified for %q+D", decl
);
1309 else if (reg_number
< 0)
1310 error ("invalid register name for %q+D", decl
);
1311 else if (TYPE_MODE (TREE_TYPE (decl
)) == BLKmode
)
1312 error ("data type of %q+D isn%'t suitable for a register",
1314 else if (! HARD_REGNO_MODE_OK (reg_number
, TYPE_MODE (TREE_TYPE (decl
))))
1315 error ("register specified for %q+D isn%'t suitable for data type",
1317 /* Now handle properly declared static register variables. */
1322 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1324 DECL_INITIAL (decl
) = 0;
1325 error ("global register variable has initial value");
1327 if (TREE_THIS_VOLATILE (decl
))
1328 warning (OPT_Wvolatile_register_var
,
1329 "optimization may eliminate reads and/or "
1330 "writes to register variables");
1332 /* If the user specified one of the eliminables registers here,
1333 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1334 confused with that register and be eliminated. This usage is
1335 somewhat suspect... */
1337 SET_DECL_RTL (decl
, gen_rtx_raw_REG (DECL_MODE (decl
), reg_number
));
1338 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1339 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1341 if (TREE_STATIC (decl
))
1343 /* Make this register global, so not usable for anything
1345 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1346 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1347 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1349 nregs
= hard_regno_nregs
[reg_number
][DECL_MODE (decl
)];
1351 globalize_reg (reg_number
+ --nregs
);
1354 /* As a register variable, it has no section. */
1358 /* Now handle ordinary static variables and functions (in memory).
1359 Also handle vars declared register invalidly. */
1360 else if (name
[0] == '*')
1362 #ifdef REGISTER_PREFIX
1363 if (strlen (REGISTER_PREFIX
) != 0)
1365 reg_number
= decode_reg_name (name
);
1366 if (reg_number
>= 0 || reg_number
== -3)
1367 error ("register name given for non-register variable %q+D", decl
);
1372 /* Specifying a section attribute on a variable forces it into a
1373 non-.bss section, and thus it cannot be common. */
1374 if (TREE_CODE (decl
) == VAR_DECL
1375 && DECL_SECTION_NAME (decl
) != NULL_TREE
1376 && DECL_INITIAL (decl
) == NULL_TREE
1377 && DECL_COMMON (decl
))
1378 DECL_COMMON (decl
) = 0;
1380 /* Variables can't be both common and weak. */
1381 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1382 DECL_COMMON (decl
) = 0;
1384 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1385 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1387 x
= gen_rtx_SYMBOL_REF (Pmode
, name
);
1388 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1389 SET_SYMBOL_REF_DECL (x
, decl
);
1391 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1392 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1393 set_mem_attributes (x
, decl
, 1);
1394 SET_DECL_RTL (decl
, x
);
1396 /* Optionally set flags or add text to the name to record information
1397 such as that it is a function name.
1398 If the name is changed, the macro ASM_OUTPUT_LABELREF
1399 will have to know how to strip this information. */
1400 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1402 /* Make this function static known to the mudflap runtime. */
1403 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1404 mudflap_enqueue_decl (decl
);
1407 /* Make the rtl for variable VAR be volatile.
1408 Use this only for static variables. */
1411 make_var_volatile (tree var
)
1413 gcc_assert (MEM_P (DECL_RTL (var
)));
1415 MEM_VOLATILE_P (DECL_RTL (var
)) = 1;
1418 /* Output a string of literal assembler code
1419 for an `asm' keyword used between functions. */
1422 assemble_asm (tree string
)
1426 if (TREE_CODE (string
) == ADDR_EXPR
)
1427 string
= TREE_OPERAND (string
, 0);
1429 fprintf (asm_out_file
, "\t%s\n", TREE_STRING_POINTER (string
));
1432 /* Record an element in the table of global destructors. SYMBOL is
1433 a SYMBOL_REF of the function to be called; PRIORITY is a number
1434 between 0 and MAX_INIT_PRIORITY. */
1437 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED
,
1438 int priority ATTRIBUTE_UNUSED
)
1440 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1441 /* Tell GNU LD that this is part of the static destructor set.
1442 This will work for any system that uses stabs, most usefully
1444 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1445 dbxout_stab_value_label (XSTR (symbol
, 0));
1447 sorry ("global destructors not supported on this target");
1451 /* Write the address of the entity given by SYMBOL to SEC. */
1453 assemble_addr_to_section (rtx symbol
, section
*sec
)
1455 switch_to_section (sec
);
1456 assemble_align (POINTER_SIZE
);
1457 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1460 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1461 not) section for PRIORITY. */
1463 get_cdtor_priority_section (int priority
, bool constructor_p
)
1467 /* ??? This only works reliably with the GNU linker. */
1468 sprintf (buf
, "%s.%.5u",
1469 constructor_p
? ".ctors" : ".dtors",
1470 /* Invert the numbering so the linker puts us in the proper
1471 order; constructors are run from right to left, and the
1472 linker sorts in increasing order. */
1473 MAX_INIT_PRIORITY
- priority
);
1474 return get_section (buf
, SECTION_WRITE
, NULL
);
1478 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1482 if (priority
!= DEFAULT_INIT_PRIORITY
)
1483 sec
= get_cdtor_priority_section (priority
,
1484 /*constructor_p=*/false);
1486 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1488 assemble_addr_to_section (symbol
, sec
);
1491 #ifdef DTORS_SECTION_ASM_OP
1493 default_dtor_section_asm_out_destructor (rtx symbol
,
1494 int priority ATTRIBUTE_UNUSED
)
1496 assemble_addr_to_section (symbol
, dtors_section
);
1500 /* Likewise for global constructors. */
1503 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED
,
1504 int priority ATTRIBUTE_UNUSED
)
1506 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1507 /* Tell GNU LD that this is part of the static destructor set.
1508 This will work for any system that uses stabs, most usefully
1510 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1511 dbxout_stab_value_label (XSTR (symbol
, 0));
1513 sorry ("global constructors not supported on this target");
1518 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1522 if (priority
!= DEFAULT_INIT_PRIORITY
)
1523 sec
= get_cdtor_priority_section (priority
,
1524 /*constructor_p=*/true);
1526 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1528 assemble_addr_to_section (symbol
, sec
);
1531 #ifdef CTORS_SECTION_ASM_OP
1533 default_ctor_section_asm_out_constructor (rtx symbol
,
1534 int priority ATTRIBUTE_UNUSED
)
1536 assemble_addr_to_section (symbol
, ctors_section
);
1540 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1541 a nonzero value if the constant pool should be output before the
1542 start of the function, or a zero value if the pool should output
1543 after the end of the function. The default is to put it before the
1546 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1547 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1550 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1551 to be output to assembler.
1552 Set first_global_object_name and weak_global_object_name as appropriate. */
1555 notice_global_symbol (tree decl
)
1557 const char **type
= &first_global_object_name
;
1559 if (first_global_object_name
1560 || !TREE_PUBLIC (decl
)
1561 || DECL_EXTERNAL (decl
)
1562 || !DECL_NAME (decl
)
1563 || (TREE_CODE (decl
) != FUNCTION_DECL
1564 && (TREE_CODE (decl
) != VAR_DECL
1565 || (DECL_COMMON (decl
)
1566 && (DECL_INITIAL (decl
) == 0
1567 || DECL_INITIAL (decl
) == error_mark_node
))))
1568 || !MEM_P (DECL_RTL (decl
)))
1571 /* We win when global object is found, but it is useful to know about weak
1572 symbol as well so we can produce nicer unique names. */
1573 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1574 type
= &weak_global_object_name
;
1580 rtx decl_rtl
= DECL_RTL (decl
);
1582 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1583 name
= ggc_strdup (p
);
1589 /* Output assembler code for the constant pool of a function and associated
1590 with defining the name of the function. DECL describes the function.
1591 NAME is the function's name. For the constant pool, we use the current
1592 constant pool data. */
1595 assemble_start_function (tree decl
, const char *fnname
)
1598 char tmp_label
[100];
1599 bool hot_label_written
= false;
1601 cfun
->unlikely_text_section_name
= NULL
;
1603 first_function_block_is_cold
= false;
1604 if (flag_reorder_blocks_and_partition
)
1606 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1607 cfun
->hot_section_label
= ggc_strdup (tmp_label
);
1608 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1609 cfun
->cold_section_label
= ggc_strdup (tmp_label
);
1610 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1611 cfun
->hot_section_end_label
= ggc_strdup (tmp_label
);
1612 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1613 cfun
->cold_section_end_label
= ggc_strdup (tmp_label
);
1618 cfun
->hot_section_label
= NULL
;
1619 cfun
->cold_section_label
= NULL
;
1620 cfun
->hot_section_end_label
= NULL
;
1621 cfun
->cold_section_end_label
= NULL
;
1624 /* The following code does not need preprocessing in the assembler. */
1628 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1629 output_constant_pool (fnname
, decl
);
1631 resolve_unique_section (decl
, 0, flag_function_sections
);
1633 /* Make sure the not and cold text (code) sections are properly
1634 aligned. This is necessary here in the case where the function
1635 has both hot and cold sections, because we don't want to re-set
1636 the alignment when the section switch happens mid-function. */
1638 if (flag_reorder_blocks_and_partition
)
1640 switch_to_section (unlikely_text_section ());
1641 assemble_align (FUNCTION_BOUNDARY
);
1642 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->cold_section_label
);
1644 /* When the function starts with a cold section, we need to explicitly
1645 align the hot section and write out the hot section label.
1646 But if the current function is a thunk, we do not have a CFG. */
1647 if (!current_function_is_thunk
1648 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1650 switch_to_section (text_section
);
1651 assemble_align (FUNCTION_BOUNDARY
);
1652 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->hot_section_label
);
1653 hot_label_written
= true;
1654 first_function_block_is_cold
= true;
1657 else if (DECL_SECTION_NAME (decl
))
1659 /* Calls to function_section rely on first_function_block_is_cold
1660 being accurate. The first block may be cold even if we aren't
1661 doing partitioning, if the entire function was decided by
1662 choose_function_section (predict.c) to be cold. */
1664 initialize_cold_section_name ();
1666 if (cfun
->unlikely_text_section_name
1667 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl
)),
1668 cfun
->unlikely_text_section_name
) == 0)
1669 first_function_block_is_cold
= true;
1672 in_cold_section_p
= first_function_block_is_cold
;
1674 /* Switch to the correct text section for the start of the function. */
1676 switch_to_section (function_section (decl
));
1677 if (flag_reorder_blocks_and_partition
1678 && !hot_label_written
)
1679 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->hot_section_label
);
1681 /* Tell assembler to move to target machine's alignment for functions. */
1682 align
= floor_log2 (FUNCTION_BOUNDARY
/ BITS_PER_UNIT
);
1683 if (align
< force_align_functions_log
)
1684 align
= force_align_functions_log
;
1687 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1690 /* Handle a user-specified function alignment.
1691 Note that we still need to align to FUNCTION_BOUNDARY, as above,
1692 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1693 if (align_functions_log
> align
1694 && cfun
->function_frequency
!= FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
)
1696 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1697 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1698 align_functions_log
, align_functions
- 1);
1700 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1704 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1705 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1708 (*debug_hooks
->begin_function
) (decl
);
1710 /* Make function name accessible from other files, if appropriate. */
1712 if (TREE_PUBLIC (decl
))
1714 notice_global_symbol (decl
);
1716 globalize_decl (decl
);
1718 maybe_assemble_visibility (decl
);
1721 if (DECL_PRESERVE_P (decl
))
1722 targetm
.asm_out
.mark_decl_preserved (fnname
);
1724 /* Do any machine/system dependent processing of the function name. */
1725 #ifdef ASM_DECLARE_FUNCTION_NAME
1726 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1728 /* Standard thing is just output label for the function. */
1729 ASM_OUTPUT_LABEL (asm_out_file
, fnname
);
1730 #endif /* ASM_DECLARE_FUNCTION_NAME */
1733 /* Output assembler code associated with defining the size of the
1734 function. DECL describes the function. NAME is the function's name. */
1737 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1739 #ifdef ASM_DECLARE_FUNCTION_SIZE
1740 /* We could have switched section in the middle of the function. */
1741 if (flag_reorder_blocks_and_partition
)
1742 switch_to_section (function_section (decl
));
1743 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1745 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1747 output_constant_pool (fnname
, decl
);
1748 switch_to_section (function_section (decl
)); /* need to switch back */
1750 /* Output labels for end of hot/cold text sections (to be used by
1752 if (flag_reorder_blocks_and_partition
)
1754 section
*save_text_section
;
1756 save_text_section
= in_section
;
1757 switch_to_section (unlikely_text_section ());
1758 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->cold_section_end_label
);
1759 if (first_function_block_is_cold
)
1760 switch_to_section (text_section
);
1762 switch_to_section (function_section (decl
));
1763 ASM_OUTPUT_LABEL (asm_out_file
, cfun
->hot_section_end_label
);
1764 switch_to_section (save_text_section
);
1768 /* Assemble code to leave SIZE bytes of zeros. */
1771 assemble_zeros (unsigned HOST_WIDE_INT size
)
1773 /* Do no output if -fsyntax-only. */
1774 if (flag_syntax_only
)
1777 #ifdef ASM_NO_SKIP_IN_TEXT
1778 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1779 so we must output 0s explicitly in the text section. */
1780 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1782 unsigned HOST_WIDE_INT i
;
1783 for (i
= 0; i
< size
; i
++)
1784 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1789 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1792 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1795 assemble_align (int align
)
1797 if (align
> BITS_PER_UNIT
)
1799 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1803 /* Assemble a string constant with the specified C string as contents. */
1806 assemble_string (const char *p
, int size
)
1811 /* If the string is very long, split it up. */
1815 int thissize
= size
- pos
;
1816 if (thissize
> maximum
)
1819 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1827 /* A noswitch_section_callback for lcomm_section. */
1830 emit_local (tree decl ATTRIBUTE_UNUSED
,
1831 const char *name ATTRIBUTE_UNUSED
,
1832 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1833 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1835 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1836 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1837 size
, DECL_ALIGN (decl
));
1839 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1840 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1843 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1848 /* A noswitch_section_callback for bss_noswitch_section. */
1850 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1852 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1853 const char *name ATTRIBUTE_UNUSED
,
1854 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1855 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1857 #if defined ASM_OUTPUT_ALIGNED_BSS
1858 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1861 ASM_OUTPUT_BSS (asm_out_file
, decl
, name
, size
, rounded
);
1867 /* A noswitch_section_callback for comm_section. */
1870 emit_common (tree decl ATTRIBUTE_UNUSED
,
1871 const char *name ATTRIBUTE_UNUSED
,
1872 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1873 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1875 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1876 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1877 size
, DECL_ALIGN (decl
));
1879 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1880 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1883 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1888 /* A noswitch_section_callback for tls_comm_section. */
1891 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1892 const char *name ATTRIBUTE_UNUSED
,
1893 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1894 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1896 #ifdef ASM_OUTPUT_TLS_COMMON
1897 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1900 sorry ("thread-local COMMON data not implemented");
1905 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1906 NAME is the name of DECL's SYMBOL_REF. */
1909 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1911 unsigned HOST_WIDE_INT size
, rounded
;
1913 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1916 /* Don't allocate zero bytes of common,
1917 since that means "undefined external" in the linker. */
1921 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1922 so that each uninitialized object starts on such a boundary. */
1923 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1924 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1925 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1927 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1928 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1929 warning (0, "requested alignment for %q+D is greater than "
1930 "implemented alignment of %wu", decl
, rounded
);
1933 /* A subroutine of assemble_variable. Output the label and contents of
1934 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1935 is as for assemble_variable. */
1938 assemble_variable_contents (tree decl
, const char *name
,
1939 bool dont_output_data
)
1941 /* Do any machine/system dependent processing of the object. */
1942 #ifdef ASM_DECLARE_OBJECT_NAME
1943 last_assemble_variable_decl
= decl
;
1944 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1946 /* Standard thing is just output label for the object. */
1947 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1948 #endif /* ASM_DECLARE_OBJECT_NAME */
1950 if (!dont_output_data
)
1952 if (DECL_INITIAL (decl
)
1953 && DECL_INITIAL (decl
) != error_mark_node
1954 && !initializer_zerop (DECL_INITIAL (decl
)))
1955 /* Output the actual data. */
1956 output_constant (DECL_INITIAL (decl
),
1957 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1960 /* Leave space for it. */
1961 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1965 /* Assemble everything that is needed for a variable or function declaration.
1966 Not used for automatic variables, and not used for function definitions.
1967 Should not be called for variables of incomplete structure type.
1969 TOP_LEVEL is nonzero if this variable has file scope.
1970 AT_END is nonzero if this is the special handling, at end of compilation,
1971 to define things that have had only tentative definitions.
1972 DONT_OUTPUT_DATA if nonzero means don't actually output the
1973 initial value (that will be done by the caller). */
1976 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1977 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1980 rtx decl_rtl
, symbol
;
1983 if (! targetm
.have_tls
1984 && TREE_CODE (decl
) == VAR_DECL
1985 && DECL_THREAD_LOCAL_P (decl
))
1987 tree to
= emutls_decl (decl
);
1989 /* If this variable is defined locally, then we need to initialize the
1990 control structure with size and alignment information. We do this
1991 at the last moment because tentative definitions can take a locally
1992 defined but uninitialized variable and initialize it later, which
1993 would result in incorrect contents. */
1994 if (! DECL_EXTERNAL (to
)
1995 && (! DECL_COMMON (to
)
1996 || (DECL_INITIAL (decl
)
1997 && DECL_INITIAL (decl
) != error_mark_node
)))
1999 VEC(constructor_elt
,gc
) *v
= VEC_alloc (constructor_elt
, gc
, 4);
2000 constructor_elt
*elt
;
2001 tree type
= TREE_TYPE (to
);
2002 tree field
= TYPE_FIELDS (type
);
2004 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2006 elt
->value
= fold_convert (TREE_TYPE (field
), DECL_SIZE_UNIT (decl
));
2008 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2009 field
= TREE_CHAIN (field
);
2011 elt
->value
= build_int_cst (TREE_TYPE (field
),
2012 DECL_ALIGN_UNIT (decl
));
2014 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2015 field
= TREE_CHAIN (field
);
2017 elt
->value
= null_pointer_node
;
2019 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2020 field
= TREE_CHAIN (field
);
2022 elt
->value
= get_emutls_init_templ_addr (decl
);
2024 DECL_INITIAL (to
) = build_constructor (type
, v
);
2026 /* Make sure the template is marked as needed early enough.
2027 Without this, if the variable is placed in a
2028 section-anchored block, the template will only be marked
2029 when it's too late. */
2030 record_references_in_initializer (to
);
2036 if (lang_hooks
.decls
.prepare_assemble_variable
)
2037 lang_hooks
.decls
.prepare_assemble_variable (decl
);
2039 last_assemble_variable_decl
= 0;
2041 /* Normally no need to say anything here for external references,
2042 since assemble_external is called by the language-specific code
2043 when a declaration is first seen. */
2045 if (DECL_EXTERNAL (decl
))
2048 /* Output no assembler code for a function declaration.
2049 Only definitions of functions output anything. */
2051 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2054 /* Do nothing for global register variables. */
2055 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2057 TREE_ASM_WRITTEN (decl
) = 1;
2061 /* If type was incomplete when the variable was declared,
2062 see if it is complete now. */
2064 if (DECL_SIZE (decl
) == 0)
2065 layout_decl (decl
, 0);
2067 /* Still incomplete => don't allocate it; treat the tentative defn
2068 (which is what it must have been) as an `extern' reference. */
2070 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2072 error ("storage size of %q+D isn%'t known", decl
);
2073 TREE_ASM_WRITTEN (decl
) = 1;
2077 /* The first declaration of a variable that comes through this function
2078 decides whether it is global (in C, has external linkage)
2079 or local (in C, has internal linkage). So do nothing more
2080 if this function has already run. */
2082 if (TREE_ASM_WRITTEN (decl
))
2085 /* Make sure targetm.encode_section_info is invoked before we set
2087 decl_rtl
= DECL_RTL (decl
);
2089 TREE_ASM_WRITTEN (decl
) = 1;
2091 /* Do no output if -fsyntax-only. */
2092 if (flag_syntax_only
)
2097 if (! dont_output_data
2098 && ! host_integerp (DECL_SIZE_UNIT (decl
), 1))
2100 error ("size of variable %q+D is too large", decl
);
2104 gcc_assert (MEM_P (decl_rtl
));
2105 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2106 symbol
= XEXP (decl_rtl
, 0);
2107 name
= XSTR (symbol
, 0);
2108 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2109 notice_global_symbol (decl
);
2111 /* Compute the alignment of this data. */
2113 align_variable (decl
, dont_output_data
);
2114 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2116 if (TREE_PUBLIC (decl
))
2117 maybe_assemble_visibility (decl
);
2119 if (DECL_PRESERVE_P (decl
))
2120 targetm
.asm_out
.mark_decl_preserved (name
);
2122 /* First make the assembler name(s) global if appropriate. */
2123 sect
= get_variable_section (decl
, false);
2124 if (TREE_PUBLIC (decl
)
2126 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2127 globalize_decl (decl
);
2129 /* Output any data that we will need to use the address of. */
2130 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2131 output_addressed_constants (DECL_INITIAL (decl
));
2133 /* dbxout.c needs to know this. */
2134 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2135 DECL_IN_TEXT_SECTION (decl
) = 1;
2137 /* If the decl is part of an object_block, make sure that the decl
2138 has been positioned within its block, but do not write out its
2139 definition yet. output_object_blocks will do that later. */
2140 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2142 gcc_assert (!dont_output_data
);
2143 place_block_symbol (symbol
);
2145 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2146 assemble_noswitch_variable (decl
, name
, sect
);
2149 switch_to_section (sect
);
2150 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2151 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2152 assemble_variable_contents (decl
, name
, dont_output_data
);
2156 /* Return 1 if type TYPE contains any pointers. */
2159 contains_pointers_p (tree type
)
2161 switch (TREE_CODE (type
))
2164 case REFERENCE_TYPE
:
2165 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2166 so I'll play safe and return 1. */
2172 case QUAL_UNION_TYPE
:
2175 /* For a type that has fields, see if the fields have pointers. */
2176 for (fields
= TYPE_FIELDS (type
); fields
; fields
= TREE_CHAIN (fields
))
2177 if (TREE_CODE (fields
) == FIELD_DECL
2178 && contains_pointers_p (TREE_TYPE (fields
)))
2184 /* An array type contains pointers if its element type does. */
2185 return contains_pointers_p (TREE_TYPE (type
));
2192 /* In unit-at-a-time mode, we delay assemble_external processing until
2193 the compilation unit is finalized. This is the best we can do for
2194 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2195 it all the way to final. See PR 17982 for further discussion. */
2196 static GTY(()) tree pending_assemble_externals
;
2198 #ifdef ASM_OUTPUT_EXTERNAL
2199 /* True if DECL is a function decl for which no out-of-line copy exists.
2200 It is assumed that DECL's assembler name has been set. */
2203 incorporeal_function_p (tree decl
)
2205 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2209 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2210 && DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
)
2213 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2214 if (strncmp (name
, "__builtin_", strlen ("__builtin_")) == 0)
2220 /* Actually do the tests to determine if this is necessary, and invoke
2221 ASM_OUTPUT_EXTERNAL. */
2223 assemble_external_real (tree decl
)
2225 rtx rtl
= DECL_RTL (decl
);
2227 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2228 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2229 && !incorporeal_function_p (decl
))
2231 /* Some systems do require some output. */
2232 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2233 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2239 process_pending_assemble_externals (void)
2241 #ifdef ASM_OUTPUT_EXTERNAL
2243 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2244 assemble_external_real (TREE_VALUE (list
));
2246 pending_assemble_externals
= 0;
2250 /* Output something to declare an external symbol to the assembler.
2251 (Most assemblers don't need this, so we normally output nothing.)
2252 Do nothing if DECL is not external. */
2255 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2257 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2258 main body of this code is only rarely exercised. To provide some
2259 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2260 open. If it's not, we should not be calling this function. */
2261 gcc_assert (asm_out_file
);
2263 #ifdef ASM_OUTPUT_EXTERNAL
2264 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2267 /* We want to output external symbols at very last to check if they
2268 are references or not. */
2269 pending_assemble_externals
= tree_cons (0, decl
,
2270 pending_assemble_externals
);
2274 /* Similar, for calling a library function FUN. */
2277 assemble_external_libcall (rtx fun
)
2279 /* Declare library function name external when first used, if nec. */
2280 if (! SYMBOL_REF_USED (fun
))
2282 SYMBOL_REF_USED (fun
) = 1;
2283 targetm
.asm_out
.external_libcall (fun
);
2287 /* Assemble a label named NAME. */
2290 assemble_label (const char *name
)
2292 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2295 /* Set the symbol_referenced flag for ID. */
2297 mark_referenced (tree id
)
2299 TREE_SYMBOL_REFERENCED (id
) = 1;
2302 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2304 mark_decl_referenced (tree decl
)
2306 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2308 /* Extern inline functions don't become needed when referenced.
2309 If we know a method will be emitted in other TU and no new
2310 functions can be marked reachable, just use the external
2312 struct cgraph_node
*node
= cgraph_node (decl
);
2313 if (!DECL_EXTERNAL (decl
)
2314 && (!node
->local
.vtable_method
|| !cgraph_global_info_ready
2315 || !node
->local
.finalized
))
2316 cgraph_mark_needed_node (node
);
2318 else if (TREE_CODE (decl
) == VAR_DECL
)
2320 struct varpool_node
*node
= varpool_node (decl
);
2321 varpool_mark_needed_node (node
);
2322 /* C++ frontend use mark_decl_references to force COMDAT variables
2323 to be output that might appear dead otherwise. */
2324 node
->force_output
= true;
2326 /* else do nothing - we can get various sorts of CST nodes here,
2327 which do not need to be marked. */
2331 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2332 until we find an identifier that is not itself a transparent alias.
2333 Modify the alias passed to it by reference (and all aliases on the
2334 way to the ultimate target), such that they do not have to be
2335 followed again, and return the ultimate target of the alias
2339 ultimate_transparent_alias_target (tree
*alias
)
2341 tree target
= *alias
;
2343 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2345 gcc_assert (TREE_CHAIN (target
));
2346 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2347 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2348 && ! TREE_CHAIN (target
));
2355 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2356 starts with a *, the rest of NAME is output verbatim. Otherwise
2357 NAME is transformed in a target-specific way (usually by the
2358 addition of an underscore). */
2361 assemble_name_raw (FILE *file
, const char *name
)
2364 fputs (&name
[1], file
);
2366 ASM_OUTPUT_LABELREF (file
, name
);
2369 /* Like assemble_name_raw, but should be used when NAME might refer to
2370 an entity that is also represented as a tree (like a function or
2371 variable). If NAME does refer to such an entity, that entity will
2372 be marked as referenced. */
2375 assemble_name (FILE *file
, const char *name
)
2377 const char *real_name
;
2380 real_name
= targetm
.strip_name_encoding (name
);
2382 id
= maybe_get_identifier (real_name
);
2387 mark_referenced (id
);
2388 ultimate_transparent_alias_target (&id
);
2390 name
= IDENTIFIER_POINTER (id
);
2391 gcc_assert (! TREE_CHAIN (id
));
2394 assemble_name_raw (file
, name
);
2397 /* Allocate SIZE bytes writable static space with a gensym name
2398 and return an RTX to refer to its address. */
2401 assemble_static_space (unsigned HOST_WIDE_INT size
)
2404 const char *namestring
;
2407 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2409 namestring
= ggc_strdup (name
);
2411 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2412 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2414 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2415 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2418 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2419 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2422 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2423 so that each uninitialized object starts on such a boundary. */
2424 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2425 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2426 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2427 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2428 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2429 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2436 /* Assemble the static constant template for function entry trampolines.
2437 This is done at most once per compilation.
2438 Returns an RTX for the address of the template. */
2440 static GTY(()) rtx initial_trampoline
;
2442 #ifdef TRAMPOLINE_TEMPLATE
2444 assemble_trampoline_template (void)
2451 if (initial_trampoline
)
2452 return initial_trampoline
;
2454 /* By default, put trampoline templates in read-only data section. */
2456 #ifdef TRAMPOLINE_SECTION
2457 switch_to_section (TRAMPOLINE_SECTION
);
2459 switch_to_section (readonly_data_section
);
2462 /* Write the assembler code to define one. */
2463 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2466 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2469 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2470 TRAMPOLINE_TEMPLATE (asm_out_file
);
2472 /* Record the rtl to refer to it. */
2473 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2474 name
= ggc_strdup (label
);
2475 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2476 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2478 initial_trampoline
= gen_rtx_MEM (BLKmode
, symbol
);
2479 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2481 return initial_trampoline
;
2485 /* A and B are either alignments or offsets. Return the minimum alignment
2486 that may be assumed after adding the two together. */
2488 static inline unsigned
2489 min_align (unsigned int a
, unsigned int b
)
2491 return (a
| b
) & -(a
| b
);
2494 /* Return the assembler directive for creating a given kind of integer
2495 object. SIZE is the number of bytes in the object and ALIGNED_P
2496 indicates whether it is known to be aligned. Return NULL if the
2497 assembly dialect has no such directive.
2499 The returned string should be printed at the start of a new line and
2500 be followed immediately by the object's initial value. */
2503 integer_asm_op (int size
, int aligned_p
)
2505 struct asm_int_op
*ops
;
2508 ops
= &targetm
.asm_out
.aligned_op
;
2510 ops
= &targetm
.asm_out
.unaligned_op
;
2515 return targetm
.asm_out
.byte_op
;
2529 /* Use directive OP to assemble an integer object X. Print OP at the
2530 start of the line, followed immediately by the value of X. */
2533 assemble_integer_with_op (const char *op
, rtx x
)
2535 fputs (op
, asm_out_file
);
2536 output_addr_const (asm_out_file
, x
);
2537 fputc ('\n', asm_out_file
);
2540 /* The default implementation of the asm_out.integer target hook. */
2543 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2544 unsigned int size ATTRIBUTE_UNUSED
,
2545 int aligned_p ATTRIBUTE_UNUSED
)
2547 const char *op
= integer_asm_op (size
, aligned_p
);
2548 /* Avoid GAS bugs for large values. Specifically negative values whose
2549 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2550 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2552 return op
&& (assemble_integer_with_op (op
, x
), true);
2555 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2556 the alignment of the integer in bits. Return 1 if we were able to output
2557 the constant, otherwise 0. We must be able to output the constant,
2558 if FORCE is nonzero. */
2561 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2565 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2567 /* See if the target hook can handle this kind of object. */
2568 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2571 /* If the object is a multi-byte one, try splitting it up. Split
2572 it into words it if is multi-word, otherwise split it into bytes. */
2575 enum machine_mode omode
, imode
;
2576 unsigned int subalign
;
2577 unsigned int subsize
, i
;
2579 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2580 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2581 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, MODE_INT
, 0);
2582 imode
= mode_for_size (size
* BITS_PER_UNIT
, MODE_INT
, 0);
2584 for (i
= 0; i
< size
; i
+= subsize
)
2586 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2587 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2593 /* If we've printed some of it, but not all of it, there's no going
2598 gcc_assert (!force
);
2604 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2606 long data
[4] = {0, 0, 0, 0};
2608 int bitsize
, nelts
, nunits
, units_per
;
2610 /* This is hairy. We have a quantity of known size. real_to_target
2611 will put it into an array of *host* longs, 32 bits per element
2612 (even if long is more than 32 bits). We need to determine the
2613 number of array elements that are occupied (nelts) and the number
2614 of *target* min-addressable units that will be occupied in the
2615 object file (nunits). We cannot assume that 32 divides the
2616 mode's bitsize (size * BITS_PER_UNIT) evenly.
2618 size * BITS_PER_UNIT is used here to make sure that padding bits
2619 (which might appear at either end of the value; real_to_target
2620 will include the padding bits in its output array) are included. */
2622 nunits
= GET_MODE_SIZE (mode
);
2623 bitsize
= nunits
* BITS_PER_UNIT
;
2624 nelts
= CEIL (bitsize
, 32);
2625 units_per
= 32 / BITS_PER_UNIT
;
2627 real_to_target (data
, &d
, mode
);
2629 /* Put out the first word with the specified alignment. */
2630 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2631 nunits
-= units_per
;
2633 /* Subsequent words need only 32-bit alignment. */
2634 align
= min_align (align
, 32);
2636 for (i
= 1; i
< nelts
; i
++)
2638 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2639 nunits
-= units_per
;
2643 /* Given an expression EXP with a constant value,
2644 reduce it to the sum of an assembler symbol and an integer.
2645 Store them both in the structure *VALUE.
2646 EXP must be reducible. */
2648 struct addr_const
GTY(())
2651 HOST_WIDE_INT offset
;
2655 decode_addr_const (tree exp
, struct addr_const
*value
)
2657 tree target
= TREE_OPERAND (exp
, 0);
2663 if (TREE_CODE (target
) == COMPONENT_REF
2664 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2667 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2668 target
= TREE_OPERAND (target
, 0);
2670 else if (TREE_CODE (target
) == ARRAY_REF
2671 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2673 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2674 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2675 target
= TREE_OPERAND (target
, 0);
2681 switch (TREE_CODE (target
))
2685 x
= DECL_RTL (target
);
2689 x
= gen_rtx_MEM (FUNCTION_MODE
,
2690 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2698 x
= output_constant_def (target
, 1);
2705 gcc_assert (MEM_P (x
));
2709 value
->offset
= offset
;
2712 /* Uniquize all constants that appear in memory.
2713 Each constant in memory thus far output is recorded
2714 in `const_desc_table'. */
2716 struct constant_descriptor_tree
GTY(())
2718 /* A MEM for the constant. */
2721 /* The value of the constant. */
2724 /* Hash of value. Computing the hash from value each time
2725 hashfn is called can't work properly, as that means recursive
2726 use of the hash table during hash table expansion. */
2730 static GTY((param_is (struct constant_descriptor_tree
)))
2731 htab_t const_desc_htab
;
2733 static struct constant_descriptor_tree
* build_constant_desc (tree
);
2734 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2736 /* Compute a hash code for a constant expression. */
2739 const_desc_hash (const void *ptr
)
2741 return ((struct constant_descriptor_tree
*)ptr
)->hash
;
2745 const_hash_1 (const tree exp
)
2750 enum tree_code code
= TREE_CODE (exp
);
2752 /* Either set P and LEN to the address and len of something to hash and
2753 exit the switch or return a value. */
2758 p
= (char *) &TREE_INT_CST (exp
);
2759 len
= sizeof TREE_INT_CST (exp
);
2763 return real_hash (TREE_REAL_CST_PTR (exp
));
2766 p
= TREE_STRING_POINTER (exp
);
2767 len
= TREE_STRING_LENGTH (exp
);
2771 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2772 + const_hash_1 (TREE_IMAGPART (exp
)));
2776 unsigned HOST_WIDE_INT idx
;
2779 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2781 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2783 hi
= hi
* 603 + const_hash_1 (value
);
2791 struct addr_const value
;
2793 decode_addr_const (exp
, &value
);
2794 switch (GET_CODE (value
.base
))
2797 /* Don't hash the address of the SYMBOL_REF;
2798 only use the offset and the symbol name. */
2800 p
= XSTR (value
.base
, 0);
2801 for (i
= 0; p
[i
] != 0; i
++)
2802 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2806 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2817 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2818 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2822 case NON_LVALUE_EXPR
:
2823 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2826 /* A language specific constant. Just hash the code. */
2830 /* Compute hashing function. */
2832 for (i
= 0; i
< len
; i
++)
2833 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2838 /* Wrapper of compare_constant, for the htab interface. */
2840 const_desc_eq (const void *p1
, const void *p2
)
2842 const struct constant_descriptor_tree
*c1
= p1
;
2843 const struct constant_descriptor_tree
*c2
= p2
;
2844 if (c1
->hash
!= c2
->hash
)
2846 return compare_constant (c1
->value
, c2
->value
);
2849 /* Compare t1 and t2, and return 1 only if they are known to result in
2850 the same bit pattern on output. */
2853 compare_constant (const tree t1
, const tree t2
)
2855 enum tree_code typecode
;
2857 if (t1
== NULL_TREE
)
2858 return t2
== NULL_TREE
;
2859 if (t2
== NULL_TREE
)
2862 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2865 switch (TREE_CODE (t1
))
2868 /* Integer constants are the same only if the same width of type. */
2869 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2871 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2873 return tree_int_cst_equal (t1
, t2
);
2876 /* Real constants are the same only if the same width of type. */
2877 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2880 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2883 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2886 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2887 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2888 TREE_STRING_LENGTH (t1
)));
2891 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2892 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2896 VEC(constructor_elt
, gc
) *v1
, *v2
;
2897 unsigned HOST_WIDE_INT idx
;
2899 typecode
= TREE_CODE (TREE_TYPE (t1
));
2900 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2903 if (typecode
== ARRAY_TYPE
)
2905 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2906 /* For arrays, check that the sizes all match. */
2907 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2909 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2914 /* For record and union constructors, require exact type
2916 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2920 v1
= CONSTRUCTOR_ELTS (t1
);
2921 v2
= CONSTRUCTOR_ELTS (t2
);
2922 if (VEC_length (constructor_elt
, v1
)
2923 != VEC_length (constructor_elt
, v2
))
2926 for (idx
= 0; idx
< VEC_length (constructor_elt
, v1
); ++idx
)
2928 constructor_elt
*c1
= VEC_index (constructor_elt
, v1
, idx
);
2929 constructor_elt
*c2
= VEC_index (constructor_elt
, v2
, idx
);
2931 /* Check that each value is the same... */
2932 if (!compare_constant (c1
->value
, c2
->value
))
2934 /* ... and that they apply to the same fields! */
2935 if (typecode
== ARRAY_TYPE
)
2937 if (!compare_constant (c1
->index
, c2
->index
))
2942 if (c1
->index
!= c2
->index
)
2953 struct addr_const value1
, value2
;
2955 decode_addr_const (t1
, &value1
);
2956 decode_addr_const (t2
, &value2
);
2957 return (value1
.offset
== value2
.offset
2958 && strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2964 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2965 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2969 case NON_LVALUE_EXPR
:
2970 case VIEW_CONVERT_EXPR
:
2971 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2976 nt1
= lang_hooks
.expand_constant (t1
);
2977 nt2
= lang_hooks
.expand_constant (t2
);
2978 if (nt1
!= t1
|| nt2
!= t2
)
2979 return compare_constant (nt1
, nt2
);
2988 /* Make a copy of the whole tree structure for a constant. This
2989 handles the same types of nodes that compare_constant handles. */
2992 copy_constant (tree exp
)
2994 switch (TREE_CODE (exp
))
2997 /* For ADDR_EXPR, we do not want to copy the decl whose address
2998 is requested. We do want to copy constants though. */
2999 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
3000 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3001 copy_constant (TREE_OPERAND (exp
, 0)));
3003 return copy_node (exp
);
3008 return copy_node (exp
);
3011 return build_complex (TREE_TYPE (exp
),
3012 copy_constant (TREE_REALPART (exp
)),
3013 copy_constant (TREE_IMAGPART (exp
)));
3017 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3018 copy_constant (TREE_OPERAND (exp
, 0)),
3019 copy_constant (TREE_OPERAND (exp
, 1)));
3023 case NON_LVALUE_EXPR
:
3024 case VIEW_CONVERT_EXPR
:
3025 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3026 copy_constant (TREE_OPERAND (exp
, 0)));
3030 tree copy
= copy_node (exp
);
3031 VEC(constructor_elt
, gc
) *v
;
3032 unsigned HOST_WIDE_INT idx
;
3033 tree purpose
, value
;
3035 v
= VEC_alloc(constructor_elt
, gc
, VEC_length(constructor_elt
,
3036 CONSTRUCTOR_ELTS (exp
)));
3037 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3039 constructor_elt
*ce
= VEC_quick_push (constructor_elt
, v
, NULL
);
3040 ce
->index
= purpose
;
3041 ce
->value
= copy_constant (value
);
3043 CONSTRUCTOR_ELTS (copy
) = v
;
3049 tree t
= lang_hooks
.expand_constant (exp
);
3051 gcc_assert (t
!= exp
);
3052 return copy_constant (t
);
3057 /* Return the alignment of constant EXP in bits. */
3060 get_constant_alignment (tree exp
)
3064 align
= TYPE_ALIGN (TREE_TYPE (exp
));
3065 #ifdef CONSTANT_ALIGNMENT
3066 align
= CONSTANT_ALIGNMENT (exp
, align
);
3071 /* Return the section into which constant EXP should be placed. */
3074 get_constant_section (tree exp
)
3076 if (IN_NAMED_SECTION (exp
))
3077 return get_named_section (exp
, NULL
, compute_reloc_for_constant (exp
));
3079 return targetm
.asm_out
.select_section (exp
,
3080 compute_reloc_for_constant (exp
),
3081 get_constant_alignment (exp
));
3084 /* Return the size of constant EXP in bytes. */
3086 static HOST_WIDE_INT
3087 get_constant_size (tree exp
)
3091 size
= int_size_in_bytes (TREE_TYPE (exp
));
3092 if (TREE_CODE (exp
) == STRING_CST
)
3093 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3097 /* Subroutine of output_constant_def:
3098 No constant equal to EXP is known to have been output.
3099 Make a constant descriptor to enter EXP in the hash table.
3100 Assign the label number and construct RTL to refer to the
3101 constant's location in memory.
3102 Caller is responsible for updating the hash table. */
3104 static struct constant_descriptor_tree
*
3105 build_constant_desc (tree exp
)
3111 struct constant_descriptor_tree
*desc
;
3113 desc
= ggc_alloc (sizeof (*desc
));
3114 desc
->value
= copy_constant (exp
);
3116 /* Propagate marked-ness to copied constant. */
3117 if (flag_mudflap
&& mf_marked_p (exp
))
3118 mf_mark (desc
->value
);
3120 /* Create a string containing the label name, in LABEL. */
3121 labelno
= const_labelno
++;
3122 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3124 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3125 if (use_object_blocks_p ())
3127 section
*sect
= get_constant_section (exp
);
3128 symbol
= create_block_symbol (ggc_strdup (label
),
3129 get_block_for_section (sect
), -1);
3132 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3133 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3134 SET_SYMBOL_REF_DECL (symbol
, desc
->value
);
3135 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3137 rtl
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3138 set_mem_attributes (rtl
, exp
, 1);
3139 set_mem_alias_set (rtl
, 0);
3140 set_mem_alias_set (rtl
, const_alias_set
);
3142 /* Set flags or add text to the name to record information, such as
3143 that it is a local symbol. If the name is changed, the macro
3144 ASM_OUTPUT_LABELREF will have to know how to strip this
3145 information. This call might invalidate our local variable
3146 SYMBOL; we can't use it afterward. */
3148 targetm
.encode_section_info (exp
, rtl
, true);
3155 /* Return an rtx representing a reference to constant data in memory
3156 for the constant expression EXP.
3158 If assembler code for such a constant has already been output,
3159 return an rtx to refer to it.
3160 Otherwise, output such a constant in memory
3161 and generate an rtx for it.
3163 If DEFER is nonzero, this constant can be deferred and output only
3164 if referenced in the function after all optimizations.
3166 `const_desc_table' records which constants already have label strings. */
3169 output_constant_def (tree exp
, int defer
)
3171 struct constant_descriptor_tree
*desc
;
3172 struct constant_descriptor_tree key
;
3175 /* Look up EXP in the table of constant descriptors. If we didn't find
3176 it, create a new one. */
3178 key
.hash
= const_hash_1 (exp
);
3179 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3184 desc
= build_constant_desc (exp
);
3185 desc
->hash
= key
.hash
;
3189 maybe_output_constant_def_contents (desc
, defer
);
3193 /* Subroutine of output_constant_def: Decide whether or not we need to
3194 output the constant DESC now, and if so, do it. */
3196 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3199 rtx symbol
= XEXP (desc
->rtl
, 0);
3200 tree exp
= desc
->value
;
3202 if (flag_syntax_only
)
3205 if (TREE_ASM_WRITTEN (exp
))
3206 /* Already output; don't do it again. */
3209 /* We can always defer constants as long as the context allows
3213 /* Increment n_deferred_constants if it exists. It needs to be at
3214 least as large as the number of constants actually referred to
3215 by the function. If it's too small we'll stop looking too early
3216 and fail to emit constants; if it's too large we'll only look
3217 through the entire function when we could have stopped earlier. */
3219 n_deferred_constants
++;
3223 output_constant_def_contents (symbol
);
3226 /* Subroutine of output_constant_def_contents. Output the definition
3227 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3228 constant's alignment in bits. */
3231 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3235 size
= get_constant_size (exp
);
3237 /* Do any machine/system dependent processing of the constant. */
3238 #ifdef ASM_DECLARE_CONSTANT_NAME
3239 ASM_DECLARE_CONSTANT_NAME (asm_out_file
, label
, exp
, size
);
3241 /* Standard thing is just output label for the constant. */
3242 ASM_OUTPUT_LABEL (asm_out_file
, label
);
3243 #endif /* ASM_DECLARE_CONSTANT_NAME */
3245 /* Output the value of EXP. */
3246 output_constant (exp
, size
, align
);
3249 /* We must output the constant data referred to by SYMBOL; do so. */
3252 output_constant_def_contents (rtx symbol
)
3254 tree exp
= SYMBOL_REF_DECL (symbol
);
3257 /* Make sure any other constants whose addresses appear in EXP
3258 are assigned label numbers. */
3259 output_addressed_constants (exp
);
3261 /* We are no longer deferring this constant. */
3262 TREE_ASM_WRITTEN (exp
) = 1;
3264 /* If the constant is part of an object block, make sure that the
3265 decl has been positioned within its block, but do not write out
3266 its definition yet. output_object_blocks will do that later. */
3267 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3268 place_block_symbol (symbol
);
3271 switch_to_section (get_constant_section (exp
));
3272 align
= get_constant_alignment (exp
);
3273 if (align
> BITS_PER_UNIT
)
3274 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3275 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3278 mudflap_enqueue_constant (exp
);
3281 /* Look up EXP in the table of constant descriptors. Return the rtl
3282 if it has been emitted, else null. */
3285 lookup_constant_def (tree exp
)
3287 struct constant_descriptor_tree
*desc
;
3288 struct constant_descriptor_tree key
;
3291 key
.hash
= const_hash_1 (exp
);
3292 desc
= htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3294 return (desc
? desc
->rtl
: NULL_RTX
);
3297 /* Used in the hash tables to avoid outputting the same constant
3298 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3299 are output once per function, not once per file. */
3300 /* ??? Only a few targets need per-function constant pools. Most
3301 can use one per-file pool. Should add a targetm bit to tell the
3304 struct rtx_constant_pool
GTY(())
3306 /* Pointers to first and last constant in pool, as ordered by offset. */
3307 struct constant_descriptor_rtx
*first
;
3308 struct constant_descriptor_rtx
*last
;
3310 /* Hash facility for making memory-constants from constant rtl-expressions.
3311 It is used on RISC machines where immediate integer arguments and
3312 constant addresses are restricted so that such constants must be stored
3314 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3316 /* Current offset in constant pool (does not include any
3317 machine-specific header). */
3318 HOST_WIDE_INT offset
;
3321 struct constant_descriptor_rtx
GTY((chain_next ("%h.next")))
3323 struct constant_descriptor_rtx
*next
;
3327 HOST_WIDE_INT offset
;
3329 enum machine_mode mode
;
3335 /* Hash and compare functions for const_rtx_htab. */
3338 const_desc_rtx_hash (const void *ptr
)
3340 const struct constant_descriptor_rtx
*desc
= ptr
;
3345 const_desc_rtx_eq (const void *a
, const void *b
)
3347 const struct constant_descriptor_rtx
*x
= a
;
3348 const struct constant_descriptor_rtx
*y
= b
;
3350 if (x
->mode
!= y
->mode
)
3352 return rtx_equal_p (x
->constant
, y
->constant
);
3355 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3358 const_rtx_hash_1 (rtx
*xp
, void *data
)
3360 unsigned HOST_WIDE_INT hwi
;
3361 enum machine_mode mode
;
3367 code
= GET_CODE (x
);
3368 mode
= GET_MODE (x
);
3369 h
= (hashval_t
) code
* 1048573 + mode
;
3377 const int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3378 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3381 h
^= (hashval_t
) hwi
;
3382 for (i
= 1; i
< n
; ++i
)
3385 h
^= (hashval_t
) hwi
;
3391 if (mode
== VOIDmode
)
3393 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3397 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3403 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3404 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3409 h
^= htab_hash_string (XSTR (x
, 0));
3413 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3417 case UNSPEC_VOLATILE
:
3418 h
= h
* 251 + XINT (x
, 1);
3426 *hp
= *hp
* 509 + h
;
3430 /* Compute a hash value for X, which should be a constant. */
3433 const_rtx_hash (rtx x
)
3436 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3441 /* Create and return a new rtx constant pool. */
3443 static struct rtx_constant_pool
*
3444 create_constant_pool (void)
3446 struct rtx_constant_pool
*pool
;
3448 pool
= ggc_alloc (sizeof (struct rtx_constant_pool
));
3449 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3450 const_desc_rtx_eq
, NULL
);
3457 /* Initialize constant pool hashing for a new function. */
3460 init_varasm_status (struct function
*f
)
3462 struct varasm_status
*p
;
3464 p
= ggc_alloc (sizeof (struct varasm_status
));
3467 p
->pool
= create_constant_pool ();
3468 p
->deferred_constants
= 0;
3471 /* Given a MINUS expression, simplify it if both sides
3472 include the same symbol. */
3475 simplify_subtraction (rtx x
)
3477 rtx r
= simplify_rtx (x
);
3481 /* Given a constant rtx X, make (or find) a memory constant for its value
3482 and return a MEM rtx to refer to it in memory. */
3485 force_const_mem (enum machine_mode mode
, rtx x
)
3487 struct constant_descriptor_rtx
*desc
, tmp
;
3488 struct rtx_constant_pool
*pool
;
3495 /* If we're not allowed to drop X into the constant pool, don't. */
3496 if (targetm
.cannot_force_const_mem (x
))
3499 /* Record that this function has used a constant pool entry. */
3500 current_function_uses_const_pool
= 1;
3502 /* Decide which pool to use. */
3503 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3504 ? shared_constant_pool
3505 : cfun
->varasm
->pool
);
3507 /* Lookup the value in the hashtable. */
3510 hash
= const_rtx_hash (x
);
3511 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3514 /* If the constant was already present, return its memory. */
3516 return copy_rtx (desc
->mem
);
3518 /* Otherwise, create a new descriptor. */
3519 desc
= ggc_alloc (sizeof (*desc
));
3522 /* Align the location counter as required by EXP's data type. */
3523 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3524 #ifdef CONSTANT_ALIGNMENT
3526 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3527 if (type
!= NULL_TREE
)
3528 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3532 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3533 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3536 desc
->constant
= tmp
.constant
;
3537 desc
->offset
= pool
->offset
;
3540 desc
->align
= align
;
3541 desc
->labelno
= const_labelno
;
3544 pool
->offset
+= GET_MODE_SIZE (mode
);
3546 pool
->last
->next
= desc
;
3548 pool
->first
= pool
->last
= desc
;
3551 /* Create a string containing the label name, in LABEL. */
3552 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3555 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3556 the constants pool. */
3557 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3559 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3560 symbol
= create_block_symbol (ggc_strdup (label
),
3561 get_block_for_section (sect
), -1);
3564 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3566 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3567 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3568 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3570 /* Construct the MEM. */
3571 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3572 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3573 set_mem_align (def
, align
);
3575 /* If we're dropping a label to the constant pool, make sure we
3577 if (GET_CODE (x
) == LABEL_REF
)
3578 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3580 return copy_rtx (def
);
3583 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3586 get_pool_constant (rtx addr
)
3588 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3591 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3592 and whether it has been output or not. */
3595 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3597 struct constant_descriptor_rtx
*desc
;
3599 desc
= SYMBOL_REF_CONSTANT (addr
);
3600 *pmarked
= (desc
->mark
!= 0);
3601 return desc
->constant
;
3604 /* Similar, return the mode. */
3607 get_pool_mode (rtx addr
)
3609 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3612 /* Return the size of the constant pool. */
3615 get_pool_size (void)
3617 return cfun
->varasm
->pool
->offset
;
3620 /* Worker function for output_constant_pool_1. Emit assembly for X
3621 in MODE with known alignment ALIGN. */
3624 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3626 switch (GET_MODE_CLASS (mode
))
3629 case MODE_DECIMAL_FLOAT
:
3633 gcc_assert (GET_CODE (x
) == CONST_DOUBLE
);
3634 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3635 assemble_real (r
, mode
, align
);
3640 case MODE_PARTIAL_INT
:
3641 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3644 case MODE_VECTOR_FLOAT
:
3645 case MODE_VECTOR_INT
:
3648 enum machine_mode submode
= GET_MODE_INNER (mode
);
3649 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3651 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3652 units
= CONST_VECTOR_NUNITS (x
);
3654 for (i
= 0; i
< units
; i
++)
3656 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3657 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3667 /* Worker function for output_constant_pool. Emit constant DESC,
3668 giving it ALIGN bits of alignment. */
3671 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3678 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3679 whose CODE_LABEL has been deleted. This can occur if a jump table
3680 is eliminated by optimization. If so, write a constant of zero
3681 instead. Note that this can also happen by turning the
3682 CODE_LABEL into a NOTE. */
3683 /* ??? This seems completely and utterly wrong. Certainly it's
3684 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3685 functioning even with INSN_DELETED_P and friends. */
3688 switch (GET_CODE (x
))
3691 if (GET_CODE (XEXP (x
, 0)) != PLUS
3692 || GET_CODE (XEXP (XEXP (x
, 0), 0)) != LABEL_REF
)
3694 tmp
= XEXP (XEXP (x
, 0), 0);
3699 gcc_assert (!INSN_DELETED_P (tmp
));
3700 gcc_assert (!NOTE_P (tmp
)
3701 || NOTE_LINE_NUMBER (tmp
) != NOTE_INSN_DELETED
);
3708 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3709 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3710 align
, desc
->labelno
, done
);
3713 assemble_align (align
);
3715 /* Output the label. */
3716 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3718 /* Output the data. */
3719 output_constant_pool_2 (desc
->mode
, x
, align
);
3721 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3722 sections have proper size. */
3723 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3725 && (in_section
->common
.flags
& SECTION_MERGE
))
3726 assemble_align (align
);
3728 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3734 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3735 to as used. Emit referenced deferred strings. This function can
3736 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3739 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3741 rtx x
= *current_rtx
;
3743 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3746 if (CONSTANT_POOL_ADDRESS_P (x
))
3748 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3749 if (desc
->mark
== 0)
3752 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3755 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3757 tree exp
= SYMBOL_REF_DECL (x
);
3758 if (!TREE_ASM_WRITTEN (exp
))
3760 n_deferred_constants
--;
3761 output_constant_def_contents (x
);
3768 /* Look through appropriate parts of INSN, marking all entries in the
3769 constant pool which are actually being used. Entries that are only
3770 referenced by other constants are also marked as used. Emit
3771 deferred strings that are used. */
3774 mark_constants (rtx insn
)
3779 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3780 insns, not any notes that may be attached. We don't want to mark
3781 a constant just because it happens to appear in a REG_EQUIV note. */
3782 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3784 rtx seq
= PATTERN (insn
);
3785 int i
, n
= XVECLEN (seq
, 0);
3786 for (i
= 0; i
< n
; ++i
)
3788 rtx subinsn
= XVECEXP (seq
, 0, i
);
3789 if (INSN_P (subinsn
))
3790 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3794 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3797 /* Look through the instructions for this function, and mark all the
3798 entries in POOL which are actually being used. Emit deferred constants
3799 which have indeed been used. */
3802 mark_constant_pool (void)
3806 if (!current_function_uses_const_pool
&& n_deferred_constants
== 0)
3809 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3810 mark_constants (insn
);
3812 for (link
= current_function_epilogue_delay_list
;
3814 link
= XEXP (link
, 1))
3815 mark_constants (XEXP (link
, 0));
3818 /* Write all the constants in POOL. */
3821 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3823 struct constant_descriptor_rtx
*desc
;
3825 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3828 /* If the constant is part of an object_block, make sure that
3829 the constant has been positioned within its block, but do not
3830 write out its definition yet. output_object_blocks will do
3832 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3833 && SYMBOL_REF_BLOCK (desc
->sym
))
3834 place_block_symbol (desc
->sym
);
3837 switch_to_section (targetm
.asm_out
.select_rtx_section
3838 (desc
->mode
, desc
->constant
, desc
->align
));
3839 output_constant_pool_1 (desc
, desc
->align
);
3844 /* Mark all constants that are used in the current function, then write
3845 out the function's private constant pool. */
3848 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3849 tree fndecl ATTRIBUTE_UNUSED
)
3851 struct rtx_constant_pool
*pool
= cfun
->varasm
->pool
;
3853 /* It is possible for gcc to call force_const_mem and then to later
3854 discard the instructions which refer to the constant. In such a
3855 case we do not need to output the constant. */
3856 mark_constant_pool ();
3858 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3859 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3862 output_constant_pool_contents (pool
);
3864 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3865 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3869 /* Write the contents of the shared constant pool. */
3872 output_shared_constant_pool (void)
3874 output_constant_pool_contents (shared_constant_pool
);
3877 /* Determine what kind of relocations EXP may need. */
3880 compute_reloc_for_constant (tree exp
)
3882 int reloc
= 0, reloc2
;
3885 /* Give the front-end a chance to convert VALUE to something that
3886 looks more like a constant to the back-end. */
3887 exp
= lang_hooks
.expand_constant (exp
);
3889 switch (TREE_CODE (exp
))
3893 /* Go inside any operations that get_inner_reference can handle and see
3894 if what's inside is a constant: no need to do anything here for
3895 addresses of variables or functions. */
3896 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3897 tem
= TREE_OPERAND (tem
, 0))
3900 if (TREE_PUBLIC (tem
))
3907 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3908 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3912 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3913 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3914 /* The difference of two local labels is computable at link time. */
3915 if (reloc
== 1 && reloc2
== 1)
3923 case NON_LVALUE_EXPR
:
3924 case VIEW_CONVERT_EXPR
:
3925 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3930 unsigned HOST_WIDE_INT idx
;
3931 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3933 reloc
|= compute_reloc_for_constant (tem
);
3943 /* Find all the constants whose addresses are referenced inside of EXP,
3944 and make sure assembler code with a label has been output for each one.
3945 Indicate whether an ADDR_EXPR has been encountered. */
3948 output_addressed_constants (tree exp
)
3952 /* Give the front-end a chance to convert VALUE to something that
3953 looks more like a constant to the back-end. */
3954 exp
= lang_hooks
.expand_constant (exp
);
3956 switch (TREE_CODE (exp
))
3960 /* Go inside any operations that get_inner_reference can handle and see
3961 if what's inside is a constant: no need to do anything here for
3962 addresses of variables or functions. */
3963 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3964 tem
= TREE_OPERAND (tem
, 0))
3967 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3968 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
3969 tem
= DECL_INITIAL (tem
);
3971 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
3972 output_constant_def (tem
, 0);
3977 output_addressed_constants (TREE_OPERAND (exp
, 1));
3982 case NON_LVALUE_EXPR
:
3983 case VIEW_CONVERT_EXPR
:
3984 output_addressed_constants (TREE_OPERAND (exp
, 0));
3989 unsigned HOST_WIDE_INT idx
;
3990 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3992 output_addressed_constants (tem
);
4001 /* Whether a constructor CTOR is a valid static constant initializer if all
4002 its elements are. This used to be internal to initializer_constant_valid_p
4003 and has been exposed to let other functions like categorize_ctor_elements
4004 evaluate the property while walking a constructor for other purposes. */
4007 constructor_static_from_elts_p (tree ctor
)
4009 return (TREE_CONSTANT (ctor
)
4010 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4011 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
)
4012 && !VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (ctor
)));
4015 /* Return nonzero if VALUE is a valid constant-valued expression
4016 for use in initializing a static variable; one that can be an
4017 element of a "constant" initializer.
4019 Return null_pointer_node if the value is absolute;
4020 if it is relocatable, return the variable that determines the relocation.
4021 We assume that VALUE has been folded as much as possible;
4022 therefore, we do not need to check for such things as
4023 arithmetic-combinations of integers. */
4026 initializer_constant_valid_p (tree value
, tree endtype
)
4028 /* Give the front-end a chance to convert VALUE to something that
4029 looks more like a constant to the back-end. */
4030 value
= lang_hooks
.expand_constant (value
);
4032 switch (TREE_CODE (value
))
4035 if (constructor_static_from_elts_p (value
))
4037 unsigned HOST_WIDE_INT idx
;
4039 bool absolute
= true;
4041 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4044 reloc
= initializer_constant_valid_p (elt
, TREE_TYPE (elt
));
4047 if (reloc
!= null_pointer_node
)
4050 /* For a non-absolute relocation, there is no single
4051 variable that can be "the variable that determines the
4053 return absolute
? null_pointer_node
: error_mark_node
;
4056 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4063 return null_pointer_node
;
4067 value
= staticp (TREE_OPERAND (value
, 0));
4070 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
4071 be a constant, this is old-skool offsetof-like nonsense. */
4072 if (TREE_CODE (value
) == INDIRECT_REF
4073 && TREE_CONSTANT (TREE_OPERAND (value
, 0)))
4074 return null_pointer_node
;
4075 /* Taking the address of a nested function involves a trampoline. */
4076 if (TREE_CODE (value
) == FUNCTION_DECL
4077 && ((decl_function_context (value
)
4078 && !DECL_NO_STATIC_CHAIN (value
))
4079 || DECL_DLLIMPORT_P (value
)))
4081 /* "&{...}" requires a temporary to hold the constructed
4083 if (TREE_CODE (value
) == CONSTRUCTOR
)
4088 case VIEW_CONVERT_EXPR
:
4089 case NON_LVALUE_EXPR
:
4090 return initializer_constant_valid_p (TREE_OPERAND (value
, 0), endtype
);
4099 src
= TREE_OPERAND (value
, 0);
4100 src_type
= TREE_TYPE (src
);
4101 dest_type
= TREE_TYPE (value
);
4103 /* Allow conversions between pointer types, floating-point
4104 types, and offset types. */
4105 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4106 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4107 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4108 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4109 return initializer_constant_valid_p (src
, endtype
);
4111 /* Allow length-preserving conversions between integer types. */
4112 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4113 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4114 return initializer_constant_valid_p (src
, endtype
);
4116 /* Allow conversions between other integer types only if
4118 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4120 tree inner
= initializer_constant_valid_p (src
, endtype
);
4121 if (inner
== null_pointer_node
)
4122 return null_pointer_node
;
4126 /* Allow (int) &foo provided int is as wide as a pointer. */
4127 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4128 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4129 return initializer_constant_valid_p (src
, endtype
);
4131 /* Likewise conversions from int to pointers, but also allow
4132 conversions from 0. */
4133 if ((POINTER_TYPE_P (dest_type
)
4134 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4135 && INTEGRAL_TYPE_P (src_type
))
4137 if (TREE_CODE (src
) == INTEGER_CST
4138 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4139 return null_pointer_node
;
4140 if (integer_zerop (src
))
4141 return null_pointer_node
;
4142 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4143 return initializer_constant_valid_p (src
, endtype
);
4146 /* Allow conversions to struct or union types if the value
4148 if (TREE_CODE (dest_type
) == RECORD_TYPE
4149 || TREE_CODE (dest_type
) == UNION_TYPE
)
4150 return initializer_constant_valid_p (src
, endtype
);
4155 if (! INTEGRAL_TYPE_P (endtype
)
4156 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4158 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4160 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4162 /* If either term is absolute, use the other terms relocation. */
4163 if (valid0
== null_pointer_node
)
4165 if (valid1
== null_pointer_node
)
4171 if (! INTEGRAL_TYPE_P (endtype
)
4172 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4174 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4176 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4178 /* Win if second argument is absolute. */
4179 if (valid1
== null_pointer_node
)
4181 /* Win if both arguments have the same relocation.
4182 Then the value is absolute. */
4183 if (valid0
== valid1
&& valid0
!= 0)
4184 return null_pointer_node
;
4186 /* Since GCC guarantees that string constants are unique in the
4187 generated code, a subtraction between two copies of the same
4188 constant string is absolute. */
4189 if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4190 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4191 && operand_equal_p (valid0
, valid1
, 1))
4192 return null_pointer_node
;
4195 /* Support narrowing differences. */
4196 if (INTEGRAL_TYPE_P (endtype
))
4200 op0
= TREE_OPERAND (value
, 0);
4201 op1
= TREE_OPERAND (value
, 1);
4203 /* Like STRIP_NOPS except allow the operand mode to widen.
4204 This works around a feature of fold that simplifies
4205 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
4206 that the narrower operation is cheaper. */
4208 while (TREE_CODE (op0
) == NOP_EXPR
4209 || TREE_CODE (op0
) == CONVERT_EXPR
4210 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4212 tree inner
= TREE_OPERAND (op0
, 0);
4213 if (inner
== error_mark_node
4214 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4215 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4216 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4221 while (TREE_CODE (op1
) == NOP_EXPR
4222 || TREE_CODE (op1
) == CONVERT_EXPR
4223 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4225 tree inner
= TREE_OPERAND (op1
, 0);
4226 if (inner
== error_mark_node
4227 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4228 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4229 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4234 op0
= initializer_constant_valid_p (op0
, endtype
);
4235 op1
= initializer_constant_valid_p (op1
, endtype
);
4237 /* Both initializers must be known. */
4241 return null_pointer_node
;
4243 /* Support differences between labels. */
4244 if (TREE_CODE (op0
) == LABEL_DECL
4245 && TREE_CODE (op1
) == LABEL_DECL
)
4246 return null_pointer_node
;
4248 if (TREE_CODE (op0
) == STRING_CST
4249 && TREE_CODE (op1
) == STRING_CST
4250 && operand_equal_p (op0
, op1
, 1))
4251 return null_pointer_node
;
4263 /* Output assembler code for constant EXP to FILE, with no label.
4264 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4265 Assumes output_addressed_constants has been done on EXP already.
4267 Generate exactly SIZE bytes of assembler data, padding at the end
4268 with zeros if necessary. SIZE must always be specified.
4270 SIZE is important for structure constructors,
4271 since trailing members may have been omitted from the constructor.
4272 It is also important for initialization of arrays from string constants
4273 since the full length of the string constant might not be wanted.
4274 It is also needed for initialization of unions, where the initializer's
4275 type is just one member, and that may not be as long as the union.
4277 There a case in which we would fail to output exactly SIZE bytes:
4278 for a structure constructor that wants to produce more than SIZE bytes.
4279 But such constructors will never be generated for any possible input.
4281 ALIGN is the alignment of the data in bits. */
4284 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4286 enum tree_code code
;
4287 unsigned HOST_WIDE_INT thissize
;
4289 /* Some front-ends use constants other than the standard language-independent
4290 varieties, but which may still be output directly. Give the front-end a
4291 chance to convert EXP to a language-independent representation. */
4292 exp
= lang_hooks
.expand_constant (exp
);
4294 if (size
== 0 || flag_syntax_only
)
4297 /* See if we're trying to initialize a pointer in a non-default mode
4298 to the address of some declaration somewhere. If the target says
4299 the mode is valid for pointers, assume the target has a way of
4301 if (TREE_CODE (exp
) == NOP_EXPR
4302 && POINTER_TYPE_P (TREE_TYPE (exp
))
4303 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4305 tree saved_type
= TREE_TYPE (exp
);
4307 /* Peel off any intermediate conversions-to-pointer for valid
4309 while (TREE_CODE (exp
) == NOP_EXPR
4310 && POINTER_TYPE_P (TREE_TYPE (exp
))
4311 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4312 exp
= TREE_OPERAND (exp
, 0);
4314 /* If what we're left with is the address of something, we can
4315 convert the address to the final type and output it that
4317 if (TREE_CODE (exp
) == ADDR_EXPR
)
4318 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4319 /* Likewise for constant ints. */
4320 else if (TREE_CODE (exp
) == INTEGER_CST
)
4321 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4322 TREE_INT_CST_HIGH (exp
));
4326 /* Eliminate any conversions since we'll be outputting the underlying
4328 while (TREE_CODE (exp
) == NOP_EXPR
|| TREE_CODE (exp
) == CONVERT_EXPR
4329 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4330 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4332 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4333 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4335 /* Make sure eliminating the conversion is really a no-op, except with
4336 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4337 union types to allow for Ada unchecked unions. */
4338 if (type_size
> op_size
4339 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4340 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4341 /* Keep the conversion. */
4344 exp
= TREE_OPERAND (exp
, 0);
4347 code
= TREE_CODE (TREE_TYPE (exp
));
4348 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4350 /* Give the front end another chance to expand constants. */
4351 exp
= lang_hooks
.expand_constant (exp
);
4353 /* Allow a constructor with no elements for any data type.
4354 This means to fill the space with zeros. */
4355 if (TREE_CODE (exp
) == CONSTRUCTOR
4356 && VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (exp
)))
4358 assemble_zeros (size
);
4362 if (TREE_CODE (exp
) == FDESC_EXPR
)
4364 #ifdef ASM_OUTPUT_FDESC
4365 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4366 tree decl
= TREE_OPERAND (exp
, 0);
4367 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4374 /* Now output the underlying data. If we've handling the padding, return.
4375 Otherwise, break and ensure SIZE is the size written. */
4382 case REFERENCE_TYPE
:
4384 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4385 EXPAND_INITIALIZER
),
4386 MIN (size
, thissize
), align
, 0))
4387 error ("initializer for integer value is too complicated");
4391 if (TREE_CODE (exp
) != REAL_CST
)
4392 error ("initializer for floating value is not a floating constant");
4394 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4398 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4399 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4400 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4405 switch (TREE_CODE (exp
))
4408 output_constructor (exp
, size
, align
);
4411 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4413 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4420 unsigned int nalign
;
4421 enum machine_mode inner
;
4423 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4424 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4426 elt_size
= GET_MODE_SIZE (inner
);
4428 link
= TREE_VECTOR_CST_ELTS (exp
);
4429 output_constant (TREE_VALUE (link
), elt_size
, align
);
4430 thissize
= elt_size
;
4431 while ((link
= TREE_CHAIN (link
)) != NULL
)
4433 output_constant (TREE_VALUE (link
), elt_size
, nalign
);
4434 thissize
+= elt_size
;
4445 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4446 output_constructor (exp
, size
, align
);
4456 if (size
> thissize
)
4457 assemble_zeros (size
- thissize
);
4461 /* Subroutine of output_constructor, used for computing the size of
4462 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4463 type with an unspecified upper bound. */
4465 static unsigned HOST_WIDE_INT
4466 array_size_for_constructor (tree val
)
4469 unsigned HOST_WIDE_INT cnt
;
4470 tree index
, value
, tmp
;
4472 /* This code used to attempt to handle string constants that are not
4473 arrays of single-bytes, but nothing else does, so there's no point in
4475 if (TREE_CODE (val
) == STRING_CST
)
4476 return TREE_STRING_LENGTH (val
);
4478 max_index
= NULL_TREE
;
4479 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4481 if (TREE_CODE (index
) == RANGE_EXPR
)
4482 index
= TREE_OPERAND (index
, 1);
4483 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4487 if (max_index
== NULL_TREE
)
4490 /* Compute the total number of array elements. */
4491 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4492 i
= size_binop (MINUS_EXPR
, fold_convert (sizetype
, max_index
),
4493 fold_convert (sizetype
, tmp
));
4494 i
= size_binop (PLUS_EXPR
, i
, build_int_cst (sizetype
, 1));
4496 /* Multiply by the array element unit size to find number of bytes. */
4497 i
= size_binop (MULT_EXPR
, i
, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4499 return tree_low_cst (i
, 1);
4502 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4503 Generate at least SIZE bytes, padding if necessary. */
4506 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
4509 tree type
= TREE_TYPE (exp
);
4512 /* Number of bytes output or skipped so far.
4513 In other words, current position within the constructor. */
4514 HOST_WIDE_INT total_bytes
= 0;
4515 /* Nonzero means BYTE contains part of a byte, to be output. */
4516 int byte_buffer_in_use
= 0;
4518 unsigned HOST_WIDE_INT cnt
;
4519 constructor_elt
*ce
;
4521 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
4523 if (TREE_CODE (type
) == RECORD_TYPE
)
4524 field
= TYPE_FIELDS (type
);
4526 if (TREE_CODE (type
) == ARRAY_TYPE
4527 && TYPE_DOMAIN (type
) != 0)
4528 min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (type
));
4530 /* As LINK goes through the elements of the constant,
4531 FIELD goes through the structure fields, if the constant is a structure.
4532 if the constant is a union, then we override this,
4533 by getting the field from the TREE_LIST element.
4534 But the constant could also be an array. Then FIELD is zero.
4536 There is always a maximum of one element in the chain LINK for unions
4537 (even if the initializer in a source program incorrectly contains
4540 VEC_iterate (constructor_elt
, CONSTRUCTOR_ELTS (exp
), cnt
, ce
);
4541 cnt
++, field
= field
? TREE_CHAIN (field
) : 0)
4543 tree val
= ce
->value
;
4546 /* The element in a union constructor specifies the proper field
4548 if ((TREE_CODE (type
) == RECORD_TYPE
|| TREE_CODE (type
) == UNION_TYPE
4549 || TREE_CODE (type
) == QUAL_UNION_TYPE
)
4553 else if (TREE_CODE (type
) == ARRAY_TYPE
)
4556 #ifdef ASM_COMMENT_START
4557 if (field
&& flag_verbose_asm
)
4558 fprintf (asm_out_file
, "%s %s:\n",
4561 ? IDENTIFIER_POINTER (DECL_NAME (field
))
4565 /* Eliminate the marker that makes a cast not be an lvalue. */
4569 if (index
&& TREE_CODE (index
) == RANGE_EXPR
)
4571 unsigned HOST_WIDE_INT fieldsize
4572 = int_size_in_bytes (TREE_TYPE (type
));
4573 HOST_WIDE_INT lo_index
= tree_low_cst (TREE_OPERAND (index
, 0), 0);
4574 HOST_WIDE_INT hi_index
= tree_low_cst (TREE_OPERAND (index
, 1), 0);
4575 HOST_WIDE_INT index
;
4576 unsigned int align2
= min_align (align
, fieldsize
* BITS_PER_UNIT
);
4578 for (index
= lo_index
; index
<= hi_index
; index
++)
4580 /* Output the element's initial value. */
4582 assemble_zeros (fieldsize
);
4584 output_constant (val
, fieldsize
, align2
);
4586 /* Count its size. */
4587 total_bytes
+= fieldsize
;
4590 else if (field
== 0 || !DECL_BIT_FIELD (field
))
4592 /* An element that is not a bit-field. */
4594 unsigned HOST_WIDE_INT fieldsize
;
4595 /* Since this structure is static,
4596 we know the positions are constant. */
4597 HOST_WIDE_INT pos
= field
? int_byte_position (field
) : 0;
4598 unsigned int align2
;
4601 pos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val
)), 1)
4602 * (tree_low_cst (index
, 0) - tree_low_cst (min_index
, 0)));
4604 /* Output any buffered-up bit-fields preceding this element. */
4605 if (byte_buffer_in_use
)
4607 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4609 byte_buffer_in_use
= 0;
4612 /* Advance to offset of this element.
4613 Note no alignment needed in an array, since that is guaranteed
4614 if each element has the proper size. */
4615 if ((field
!= 0 || index
!= 0) && pos
!= total_bytes
)
4617 gcc_assert (pos
>= total_bytes
);
4618 assemble_zeros (pos
- total_bytes
);
4622 /* Find the alignment of this element. */
4623 align2
= min_align (align
, BITS_PER_UNIT
* pos
);
4625 /* Determine size this element should occupy. */
4630 /* If this is an array with an unspecified upper bound,
4631 the initializer determines the size. */
4632 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4633 but we cannot do this until the deprecated support for
4634 initializing zero-length array members is removed. */
4635 if (TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
4636 && TYPE_DOMAIN (TREE_TYPE (field
))
4637 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field
))))
4639 fieldsize
= array_size_for_constructor (val
);
4640 /* Given a non-empty initialization, this field had
4642 gcc_assert (!fieldsize
|| !TREE_CHAIN (field
));
4644 else if (DECL_SIZE_UNIT (field
))
4646 /* ??? This can't be right. If the decl size overflows
4647 a host integer we will silently emit no data. */
4648 if (host_integerp (DECL_SIZE_UNIT (field
), 1))
4649 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (field
), 1);
4653 fieldsize
= int_size_in_bytes (TREE_TYPE (type
));
4655 /* Output the element's initial value. */
4657 assemble_zeros (fieldsize
);
4659 output_constant (val
, fieldsize
, align2
);
4661 /* Count its size. */
4662 total_bytes
+= fieldsize
;
4664 else if (val
!= 0 && TREE_CODE (val
) != INTEGER_CST
)
4665 error ("invalid initial value for member %qs",
4666 IDENTIFIER_POINTER (DECL_NAME (field
)));
4669 /* Element that is a bit-field. */
4671 HOST_WIDE_INT next_offset
= int_bit_position (field
);
4672 HOST_WIDE_INT end_offset
4673 = (next_offset
+ tree_low_cst (DECL_SIZE (field
), 1));
4676 val
= integer_zero_node
;
4678 /* If this field does not start in this (or, next) byte,
4680 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4682 /* Output remnant of any bit field in previous bytes. */
4683 if (byte_buffer_in_use
)
4685 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4687 byte_buffer_in_use
= 0;
4690 /* If still not at proper byte, advance to there. */
4691 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4693 gcc_assert (next_offset
/ BITS_PER_UNIT
>= total_bytes
);
4694 assemble_zeros (next_offset
/ BITS_PER_UNIT
- total_bytes
);
4695 total_bytes
= next_offset
/ BITS_PER_UNIT
;
4699 if (! byte_buffer_in_use
)
4702 /* We must split the element into pieces that fall within
4703 separate bytes, and combine each byte with previous or
4704 following bit-fields. */
4706 /* next_offset is the offset n fbits from the beginning of
4707 the structure to the next bit of this element to be processed.
4708 end_offset is the offset of the first bit past the end of
4710 while (next_offset
< end_offset
)
4714 HOST_WIDE_INT value
;
4715 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4716 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4718 /* Advance from byte to byte
4719 within this element when necessary. */
4720 while (next_byte
!= total_bytes
)
4722 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4727 /* Number of bits we can process at once
4728 (all part of the same byte). */
4729 this_time
= MIN (end_offset
- next_offset
,
4730 BITS_PER_UNIT
- next_bit
);
4731 if (BYTES_BIG_ENDIAN
)
4733 /* On big-endian machine, take the most significant bits
4734 first (of the bits that are significant)
4735 and put them into bytes from the most significant end. */
4736 shift
= end_offset
- next_offset
- this_time
;
4738 /* Don't try to take a bunch of bits that cross
4739 the word boundary in the INTEGER_CST. We can
4740 only select bits from the LOW or HIGH part
4742 if (shift
< HOST_BITS_PER_WIDE_INT
4743 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4745 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4746 shift
= HOST_BITS_PER_WIDE_INT
;
4749 /* Now get the bits from the appropriate constant word. */
4750 if (shift
< HOST_BITS_PER_WIDE_INT
)
4751 value
= TREE_INT_CST_LOW (val
);
4754 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4755 value
= TREE_INT_CST_HIGH (val
);
4756 shift
-= HOST_BITS_PER_WIDE_INT
;
4759 /* Get the result. This works only when:
4760 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4761 byte
|= (((value
>> shift
)
4762 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4763 << (BITS_PER_UNIT
- this_time
- next_bit
));
4767 /* On little-endian machines,
4768 take first the least significant bits of the value
4769 and pack them starting at the least significant
4770 bits of the bytes. */
4771 shift
= next_offset
- int_bit_position (field
);
4773 /* Don't try to take a bunch of bits that cross
4774 the word boundary in the INTEGER_CST. We can
4775 only select bits from the LOW or HIGH part
4777 if (shift
< HOST_BITS_PER_WIDE_INT
4778 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4779 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
4781 /* Now get the bits from the appropriate constant word. */
4782 if (shift
< HOST_BITS_PER_WIDE_INT
)
4783 value
= TREE_INT_CST_LOW (val
);
4786 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4787 value
= TREE_INT_CST_HIGH (val
);
4788 shift
-= HOST_BITS_PER_WIDE_INT
;
4791 /* Get the result. This works only when:
4792 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4793 byte
|= (((value
>> shift
)
4794 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4798 next_offset
+= this_time
;
4799 byte_buffer_in_use
= 1;
4804 if (byte_buffer_in_use
)
4806 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4810 if ((unsigned HOST_WIDE_INT
)total_bytes
< size
)
4811 assemble_zeros (size
- total_bytes
);
4814 /* This TREE_LIST contains any weak symbol declarations waiting
4816 static GTY(()) tree weak_decls
;
4818 /* Mark DECL as weak. */
4821 mark_weak (tree decl
)
4823 DECL_WEAK (decl
) = 1;
4825 if (DECL_RTL_SET_P (decl
)
4826 && MEM_P (DECL_RTL (decl
))
4827 && XEXP (DECL_RTL (decl
), 0)
4828 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
4829 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
4832 /* Merge weak status between NEWDECL and OLDDECL. */
4835 merge_weak (tree newdecl
, tree olddecl
)
4837 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
4839 if (DECL_WEAK (newdecl
) && SUPPORTS_WEAK
)
4842 /* We put the NEWDECL on the weak_decls list at some point
4843 and OLDDECL as well. Keep just OLDDECL on the list. */
4844 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
4845 if (TREE_VALUE (*pwd
) == newdecl
)
4847 *pwd
= TREE_CHAIN (*pwd
);
4854 if (DECL_WEAK (newdecl
))
4858 /* NEWDECL is weak, but OLDDECL is not. */
4860 /* If we already output the OLDDECL, we're in trouble; we can't
4861 go back and make it weak. This error cannot caught in
4862 declare_weak because the NEWDECL and OLDDECL was not yet
4863 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4864 if (TREE_ASM_WRITTEN (olddecl
))
4865 error ("weak declaration of %q+D must precede definition",
4868 /* If we've already generated rtl referencing OLDDECL, we may
4869 have done so in a way that will not function properly with
4871 else if (TREE_USED (olddecl
)
4872 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)))
4873 warning (0, "weak declaration of %q+D after first use results "
4874 "in unspecified behavior", newdecl
);
4878 /* We put the NEWDECL on the weak_decls list at some point.
4879 Replace it with the OLDDECL. */
4880 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
4881 if (TREE_VALUE (wd
) == newdecl
)
4883 TREE_VALUE (wd
) = olddecl
;
4886 /* We may not find the entry on the list. If NEWDECL is a
4887 weak alias, then we will have already called
4888 globalize_decl to remove the entry; in that case, we do
4889 not need to do anything. */
4892 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4893 mark_weak (olddecl
);
4896 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4897 weak. Just update NEWDECL to indicate that it's weak too. */
4898 mark_weak (newdecl
);
4901 /* Declare DECL to be a weak symbol. */
4904 declare_weak (tree decl
)
4906 if (! TREE_PUBLIC (decl
))
4907 error ("weak declaration of %q+D must be public", decl
);
4908 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& TREE_ASM_WRITTEN (decl
))
4909 error ("weak declaration of %q+D must precede definition", decl
);
4910 else if (SUPPORTS_WEAK
)
4912 if (! DECL_WEAK (decl
))
4913 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
4916 warning (0, "weak declaration of %q+D not supported", decl
);
4922 weak_finish_1 (tree decl
)
4924 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4925 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
4928 if (! TREE_USED (decl
))
4931 #ifdef ASM_WEAKEN_DECL
4932 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
4934 #ifdef ASM_WEAKEN_LABEL
4935 ASM_WEAKEN_LABEL (asm_out_file
, name
);
4937 #ifdef ASM_OUTPUT_WEAK_ALIAS
4939 static bool warn_once
= 0;
4942 warning (0, "only weak aliases are supported in this configuration");
4952 /* This TREE_LIST contains weakref targets. */
4954 static GTY(()) tree weakref_targets
;
4956 /* Forward declaration. */
4957 static tree
find_decl_and_mark_needed (tree decl
, tree target
);
4959 /* Emit any pending weak declarations. */
4966 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
4968 tree alias_decl
= TREE_PURPOSE (t
);
4969 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
4971 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
4972 /* Remove alias_decl from the weak list, but leave entries for
4973 the target alone. */
4975 #ifndef ASM_OUTPUT_WEAKREF
4976 else if (! TREE_SYMBOL_REFERENCED (target
))
4978 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4979 defined, otherwise we and weak_finish_1 would use a
4980 different macros. */
4981 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4982 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
4984 tree decl
= find_decl_and_mark_needed (alias_decl
, target
);
4988 decl
= build_decl (TREE_CODE (alias_decl
), target
,
4989 TREE_TYPE (alias_decl
));
4991 DECL_EXTERNAL (decl
) = 1;
4992 TREE_PUBLIC (decl
) = 1;
4993 DECL_ARTIFICIAL (decl
) = 1;
4994 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
4995 TREE_USED (decl
) = 1;
4998 weak_finish_1 (decl
);
5007 /* Remove the alias and the target from the pending weak list
5008 so that we do not emit any .weak directives for the former,
5009 nor multiple .weak directives for the latter. */
5010 for (p
= &weak_decls
; (t2
= *p
) ; )
5012 if (TREE_VALUE (t2
) == alias_decl
5013 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5014 *p
= TREE_CHAIN (t2
);
5016 p
= &TREE_CHAIN (t2
);
5019 /* Remove other weakrefs to the same target, to speed things up. */
5020 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5022 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5023 *p
= TREE_CHAIN (t2
);
5025 p
= &TREE_CHAIN (t2
);
5030 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5032 tree decl
= TREE_VALUE (t
);
5034 weak_finish_1 (decl
);
5038 /* Emit the assembly bits to indicate that DECL is globally visible. */
5041 globalize_decl (tree decl
)
5044 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5045 if (DECL_WEAK (decl
))
5047 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5050 #ifdef ASM_WEAKEN_DECL
5051 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5053 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5056 /* Remove this function from the pending weak list so that
5057 we do not emit multiple .weak directives for it. */
5058 for (p
= &weak_decls
; (t
= *p
) ; )
5060 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5061 *p
= TREE_CHAIN (t
);
5063 p
= &TREE_CHAIN (t
);
5066 /* Remove weakrefs to the same target from the pending weakref
5067 list, for the same reason. */
5068 for (p
= &weakref_targets
; (t
= *p
) ; )
5070 if (DECL_ASSEMBLER_NAME (decl
)
5071 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5072 *p
= TREE_CHAIN (t
);
5074 p
= &TREE_CHAIN (t
);
5081 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5084 /* We have to be able to tell cgraph about the needed-ness of the target
5085 of an alias. This requires that the decl have been defined. Aliases
5086 that precede their definition have to be queued for later processing. */
5088 typedef struct alias_pair
GTY(())
5094 /* Define gc'd vector type. */
5095 DEF_VEC_O(alias_pair
);
5096 DEF_VEC_ALLOC_O(alias_pair
,gc
);
5098 static GTY(()) VEC(alias_pair
,gc
) *alias_pairs
;
5100 /* Given an assembly name, find the decl it is associated with. At the
5101 same time, mark it needed for cgraph. */
5104 find_decl_and_mark_needed (tree decl
, tree target
)
5106 struct cgraph_node
*fnode
= NULL
;
5107 struct varpool_node
*vnode
= NULL
;
5109 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5111 fnode
= cgraph_node_for_asm (target
);
5113 vnode
= varpool_node_for_asm (target
);
5117 vnode
= varpool_node_for_asm (target
);
5119 fnode
= cgraph_node_for_asm (target
);
5124 /* We can't mark function nodes as used after cgraph global info
5125 is finished. This wouldn't generally be necessary, but C++
5126 virtual table thunks are introduced late in the game and
5127 might seem like they need marking, although in fact they
5129 if (! cgraph_global_info_ready
)
5130 cgraph_mark_needed_node (fnode
);
5135 varpool_mark_needed_node (vnode
);
5142 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5143 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5144 tree node is DECL to have the value of the tree node TARGET. */
5147 do_assemble_alias (tree decl
, tree target
)
5149 if (TREE_ASM_WRITTEN (decl
))
5152 TREE_ASM_WRITTEN (decl
) = 1;
5153 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5155 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5157 ultimate_transparent_alias_target (&target
);
5159 if (!targetm
.have_tls
5160 && TREE_CODE (decl
) == VAR_DECL
5161 && DECL_THREAD_LOCAL_P (decl
))
5163 decl
= emutls_decl (decl
);
5164 target
= get_emutls_object_name (target
);
5167 if (!TREE_SYMBOL_REFERENCED (target
))
5168 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5170 #ifdef ASM_OUTPUT_WEAKREF
5171 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5172 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5173 IDENTIFIER_POINTER (target
));
5177 error ("%Jweakref is not supported in this configuration", decl
);
5184 if (!targetm
.have_tls
5185 && TREE_CODE (decl
) == VAR_DECL
5186 && DECL_THREAD_LOCAL_P (decl
))
5188 decl
= emutls_decl (decl
);
5189 target
= get_emutls_object_name (target
);
5192 #ifdef ASM_OUTPUT_DEF
5193 /* Make name accessible from other files, if appropriate. */
5195 if (TREE_PUBLIC (decl
))
5197 globalize_decl (decl
);
5198 maybe_assemble_visibility (decl
);
5201 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5202 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5204 ASM_OUTPUT_DEF (asm_out_file
,
5205 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5206 IDENTIFIER_POINTER (target
));
5208 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5213 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5214 # ifdef ASM_WEAKEN_DECL
5215 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5217 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5219 /* Remove this function from the pending weak list so that
5220 we do not emit multiple .weak directives for it. */
5221 for (p
= &weak_decls
; (t
= *p
) ; )
5222 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5223 *p
= TREE_CHAIN (t
);
5225 p
= &TREE_CHAIN (t
);
5227 /* Remove weakrefs to the same target from the pending weakref
5228 list, for the same reason. */
5229 for (p
= &weakref_targets
; (t
= *p
) ; )
5231 if (DECL_ASSEMBLER_NAME (decl
)
5232 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5233 *p
= TREE_CHAIN (t
);
5235 p
= &TREE_CHAIN (t
);
5241 /* First pass of completing pending aliases. Make sure that cgraph knows
5242 which symbols will be required. */
5245 finish_aliases_1 (void)
5250 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5254 target_decl
= find_decl_and_mark_needed (p
->decl
, p
->target
);
5255 if (target_decl
== NULL
)
5257 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5258 error ("%q+D aliased to undefined symbol %qs",
5259 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5261 else if (DECL_EXTERNAL (target_decl
)
5262 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5263 error ("%q+D aliased to external symbol %qs",
5264 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5268 /* Second pass of completing pending aliases. Emit the actual assembly.
5269 This happens at the end of compilation and thus it is assured that the
5270 target symbol has been emitted. */
5273 finish_aliases_2 (void)
5278 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5279 do_assemble_alias (p
->decl
, p
->target
);
5281 VEC_truncate (alias_pair
, alias_pairs
, 0);
5284 /* Emit an assembler directive to make the symbol for DECL an alias to
5285 the symbol for TARGET. */
5288 assemble_alias (tree decl
, tree target
)
5291 bool is_weakref
= false;
5293 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5295 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5299 ultimate_transparent_alias_target (&target
);
5301 if (alias
== target
)
5302 error ("weakref %q+D ultimately targets itself", decl
);
5305 #ifndef ASM_OUTPUT_WEAKREF
5306 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5307 TREE_CHAIN (alias
) = target
;
5310 if (TREE_PUBLIC (decl
))
5311 error ("weakref %q+D must have static linkage", decl
);
5315 #if !defined (ASM_OUTPUT_DEF)
5316 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5317 error ("%Jalias definitions not supported in this configuration", decl
);
5320 if (!DECL_WEAK (decl
))
5322 error ("%Jonly weak aliases are supported in this configuration", decl
);
5329 /* We must force creation of DECL_RTL for debug info generation, even though
5330 we don't use it here. */
5331 make_decl_rtl (decl
);
5332 TREE_USED (decl
) = 1;
5334 /* A quirk of the initial implementation of aliases required that the user
5335 add "extern" to all of them. Which is silly, but now historical. Do
5336 note that the symbol is in fact locally defined. */
5338 DECL_EXTERNAL (decl
) = 0;
5340 /* Allow aliases to aliases. */
5341 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5342 cgraph_node (decl
)->alias
= true;
5344 varpool_node (decl
)->alias
= true;
5346 /* If the target has already been emitted, we don't have to queue the
5347 alias. This saves a tad o memory. */
5348 target_decl
= find_decl_and_mark_needed (decl
, target
);
5349 if (target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5350 do_assemble_alias (decl
, target
);
5353 alias_pair
*p
= VEC_safe_push (alias_pair
, gc
, alias_pairs
, NULL
);
5359 /* Emit an assembler directive to set symbol for DECL visibility to
5360 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5363 default_assemble_visibility (tree decl
, int vis
)
5365 static const char * const visibility_types
[] = {
5366 NULL
, "protected", "hidden", "internal"
5369 const char *name
, *type
;
5371 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5372 type
= visibility_types
[vis
];
5374 #ifdef HAVE_GAS_HIDDEN
5375 fprintf (asm_out_file
, "\t.%s\t", type
);
5376 assemble_name (asm_out_file
, name
);
5377 fprintf (asm_out_file
, "\n");
5379 warning (OPT_Wattributes
, "visibility attribute not supported "
5380 "in this configuration; ignored");
5384 /* A helper function to call assemble_visibility when needed for a decl. */
5387 maybe_assemble_visibility (tree decl
)
5389 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5391 if (vis
!= VISIBILITY_DEFAULT
)
5393 targetm
.asm_out
.visibility (decl
, vis
);
5400 /* Returns 1 if the target configuration supports defining public symbols
5401 so that one of them will be chosen at link time instead of generating a
5402 multiply-defined symbol error, whether through the use of weak symbols or
5403 a target-specific mechanism for having duplicates discarded. */
5406 supports_one_only (void)
5408 if (SUPPORTS_ONE_ONLY
)
5410 return SUPPORTS_WEAK
;
5413 /* Set up DECL as a public symbol that can be defined in multiple
5414 translation units without generating a linker error. */
5417 make_decl_one_only (tree decl
)
5419 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5420 || TREE_CODE (decl
) == FUNCTION_DECL
);
5422 TREE_PUBLIC (decl
) = 1;
5424 if (SUPPORTS_ONE_ONLY
)
5426 #ifdef MAKE_DECL_ONE_ONLY
5427 MAKE_DECL_ONE_ONLY (decl
);
5429 DECL_ONE_ONLY (decl
) = 1;
5431 else if (TREE_CODE (decl
) == VAR_DECL
5432 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5433 DECL_COMMON (decl
) = 1;
5436 gcc_assert (SUPPORTS_WEAK
);
5437 DECL_WEAK (decl
) = 1;
5442 init_varasm_once (void)
5444 section_htab
= htab_create_ggc (31, section_entry_hash
,
5445 section_entry_eq
, NULL
);
5446 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5447 object_block_entry_eq
, NULL
);
5448 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5449 const_desc_eq
, NULL
);
5451 const_alias_set
= new_alias_set ();
5452 shared_constant_pool
= create_constant_pool ();
5454 #ifdef TEXT_SECTION_ASM_OP
5455 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5456 TEXT_SECTION_ASM_OP
);
5459 #ifdef DATA_SECTION_ASM_OP
5460 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5461 DATA_SECTION_ASM_OP
);
5464 #ifdef SDATA_SECTION_ASM_OP
5465 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5466 SDATA_SECTION_ASM_OP
);
5469 #ifdef READONLY_DATA_SECTION_ASM_OP
5470 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5471 READONLY_DATA_SECTION_ASM_OP
);
5474 #ifdef CTORS_SECTION_ASM_OP
5475 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5476 CTORS_SECTION_ASM_OP
);
5479 #ifdef DTORS_SECTION_ASM_OP
5480 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5481 DTORS_SECTION_ASM_OP
);
5484 #ifdef BSS_SECTION_ASM_OP
5485 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5486 output_section_asm_op
,
5487 BSS_SECTION_ASM_OP
);
5490 #ifdef SBSS_SECTION_ASM_OP
5491 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5492 output_section_asm_op
,
5493 SBSS_SECTION_ASM_OP
);
5496 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5497 | SECTION_COMMON
, emit_tls_common
);
5498 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5499 | SECTION_COMMON
, emit_local
);
5500 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5501 | SECTION_COMMON
, emit_common
);
5503 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5504 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5508 targetm
.asm_out
.init_sections ();
5510 if (readonly_data_section
== NULL
)
5511 readonly_data_section
= text_section
;
5515 decl_default_tls_model (tree decl
)
5517 enum tls_model kind
;
5520 is_local
= targetm
.binds_local_p (decl
);
5524 kind
= TLS_MODEL_LOCAL_EXEC
;
5526 kind
= TLS_MODEL_INITIAL_EXEC
;
5529 /* Local dynamic is inefficient when we're not combining the
5530 parts of the address. */
5531 else if (optimize
&& is_local
)
5532 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5534 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5535 if (kind
< flag_tls_default
)
5536 kind
= flag_tls_default
;
5541 /* Select a set of attributes for section NAME based on the properties
5542 of DECL and whether or not RELOC indicates that DECL's initializer
5543 might contain runtime relocations.
5545 We make the section read-only and executable for a function decl,
5546 read-only for a const data decl, and writable for a non-const data decl. */
5549 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5551 return default_section_type_flags_1 (decl
, name
, reloc
, flag_pic
);
5555 default_section_type_flags_1 (tree decl
, const char *name
, int reloc
,
5560 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5561 flags
= SECTION_CODE
;
5562 else if (decl
&& decl_readonly_section_1 (decl
, reloc
, shlib
))
5564 else if (current_function_decl
5566 && cfun
->unlikely_text_section_name
5567 && strcmp (name
, cfun
->unlikely_text_section_name
) == 0)
5568 flags
= SECTION_CODE
;
5570 && (!current_function_decl
|| !cfun
)
5571 && strcmp (name
, UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
5572 flags
= SECTION_CODE
;
5574 flags
= SECTION_WRITE
;
5576 if (decl
&& DECL_ONE_ONLY (decl
))
5577 flags
|= SECTION_LINKONCE
;
5579 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5580 flags
|= SECTION_TLS
| SECTION_WRITE
;
5582 if (strcmp (name
, ".bss") == 0
5583 || strncmp (name
, ".bss.", 5) == 0
5584 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
5585 || strcmp (name
, ".sbss") == 0
5586 || strncmp (name
, ".sbss.", 6) == 0
5587 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
5588 flags
|= SECTION_BSS
;
5590 if (strcmp (name
, ".tdata") == 0
5591 || strncmp (name
, ".tdata.", 7) == 0
5592 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
5593 flags
|= SECTION_TLS
;
5595 if (strcmp (name
, ".tbss") == 0
5596 || strncmp (name
, ".tbss.", 6) == 0
5597 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
5598 flags
|= SECTION_TLS
| SECTION_BSS
;
5600 /* These three sections have special ELF types. They are neither
5601 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5602 want to print a section type (@progbits or @nobits). If someone
5603 is silly enough to emit code or TLS variables to one of these
5604 sections, then don't handle them specially. */
5605 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
5606 && (strcmp (name
, ".init_array") == 0
5607 || strcmp (name
, ".fini_array") == 0
5608 || strcmp (name
, ".preinit_array") == 0))
5609 flags
|= SECTION_NOTYPE
;
5614 /* Return true if the target supports some form of global BSS,
5615 either through bss_noswitch_section, or by selecting a BSS
5616 section in TARGET_ASM_SELECT_SECTION. */
5619 have_global_bss_p (void)
5621 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
5624 /* Output assembly to switch to section NAME with attribute FLAGS.
5625 Four variants for common object file formats. */
5628 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
5629 unsigned int flags ATTRIBUTE_UNUSED
,
5630 tree decl ATTRIBUTE_UNUSED
)
5632 /* Some object formats don't support named sections at all. The
5633 front-end should already have flagged this as an error. */
5638 default_elf_asm_named_section (const char *name
, unsigned int flags
,
5639 tree decl ATTRIBUTE_UNUSED
)
5641 char flagchars
[10], *f
= flagchars
;
5643 /* If we have already declared this section, we can use an
5644 abbreviated form to switch back to it -- unless this section is
5645 part of a COMDAT groups, in which case GAS requires the full
5646 declaration every time. */
5647 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5648 && (flags
& SECTION_DECLARED
))
5650 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
5654 if (!(flags
& SECTION_DEBUG
))
5656 if (flags
& SECTION_WRITE
)
5658 if (flags
& SECTION_CODE
)
5660 if (flags
& SECTION_SMALL
)
5662 if (flags
& SECTION_MERGE
)
5664 if (flags
& SECTION_STRINGS
)
5666 if (flags
& SECTION_TLS
)
5668 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5672 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
5674 if (!(flags
& SECTION_NOTYPE
))
5679 if (flags
& SECTION_BSS
)
5685 #ifdef ASM_COMMENT_START
5686 /* On platforms that use "@" as the assembly comment character,
5688 if (strcmp (ASM_COMMENT_START
, "@") == 0)
5691 fprintf (asm_out_file
, format
, type
);
5693 if (flags
& SECTION_ENTSIZE
)
5694 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
5695 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5696 fprintf (asm_out_file
, ",%s,comdat",
5697 lang_hooks
.decls
.comdat_group (decl
));
5700 putc ('\n', asm_out_file
);
5704 default_coff_asm_named_section (const char *name
, unsigned int flags
,
5705 tree decl ATTRIBUTE_UNUSED
)
5707 char flagchars
[8], *f
= flagchars
;
5709 if (flags
& SECTION_WRITE
)
5711 if (flags
& SECTION_CODE
)
5715 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
5719 default_pe_asm_named_section (const char *name
, unsigned int flags
,
5722 default_coff_asm_named_section (name
, flags
, decl
);
5724 if (flags
& SECTION_LINKONCE
)
5726 /* Functions may have been compiled at various levels of
5727 optimization so we can't use `same_size' here.
5728 Instead, have the linker pick one. */
5729 fprintf (asm_out_file
, "\t.linkonce %s\n",
5730 (flags
& SECTION_CODE
? "discard" : "same_size"));
5734 /* The lame default section selector. */
5737 default_select_section (tree decl
, int reloc
,
5738 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
5742 if (decl_readonly_section (decl
, reloc
))
5743 return readonly_data_section
;
5745 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5747 if (! ((flag_pic
&& reloc
)
5748 || !TREE_READONLY (decl
)
5749 || TREE_SIDE_EFFECTS (decl
)
5750 || !TREE_CONSTANT (decl
)))
5751 return readonly_data_section
;
5753 else if (TREE_CODE (decl
) == STRING_CST
)
5754 return readonly_data_section
;
5755 else if (! (flag_pic
&& reloc
))
5756 return readonly_data_section
;
5758 return data_section
;
5761 enum section_category
5762 categorize_decl_for_section (tree decl
, int reloc
, int shlib
)
5764 enum section_category ret
;
5766 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5768 else if (TREE_CODE (decl
) == STRING_CST
)
5770 if (flag_mudflap
) /* or !flag_merge_constants */
5771 return SECCAT_RODATA
;
5773 return SECCAT_RODATA_MERGE_STR
;
5775 else if (TREE_CODE (decl
) == VAR_DECL
)
5777 if (bss_initializer_p (decl
))
5779 else if (! TREE_READONLY (decl
)
5780 || TREE_SIDE_EFFECTS (decl
)
5781 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
5783 if (shlib
&& (reloc
& 2))
5784 ret
= SECCAT_DATA_REL
;
5785 else if (shlib
&& reloc
)
5786 ret
= SECCAT_DATA_REL_LOCAL
;
5790 else if (shlib
&& (reloc
& 2))
5791 ret
= SECCAT_DATA_REL_RO
;
5792 else if (shlib
&& reloc
)
5793 ret
= SECCAT_DATA_REL_RO_LOCAL
;
5794 else if (reloc
|| flag_merge_constants
< 2)
5795 /* C and C++ don't allow different variables to share the same
5796 location. -fmerge-all-constants allows even that (at the
5797 expense of not conforming). */
5798 ret
= SECCAT_RODATA
;
5799 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
5800 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
5802 ret
= SECCAT_RODATA_MERGE_CONST
;
5804 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5806 if ((shlib
&& reloc
)
5807 || TREE_SIDE_EFFECTS (decl
)
5808 || ! TREE_CONSTANT (decl
))
5811 ret
= SECCAT_RODATA
;
5814 ret
= SECCAT_RODATA
;
5816 /* There are no read-only thread-local sections. */
5817 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5819 /* Note that this would be *just* SECCAT_BSS, except that there's
5820 no concept of a read-only thread-local-data section. */
5821 if (ret
== SECCAT_BSS
5822 || (flag_zero_initialized_in_bss
5823 && initializer_zerop (DECL_INITIAL (decl
))))
5829 /* If the target uses small data sections, select it. */
5830 else if (targetm
.in_small_data_p (decl
))
5832 if (ret
== SECCAT_BSS
)
5834 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
5835 ret
= SECCAT_SRODATA
;
5844 decl_readonly_section (tree decl
, int reloc
)
5846 return decl_readonly_section_1 (decl
, reloc
, flag_pic
);
5850 decl_readonly_section_1 (tree decl
, int reloc
, int shlib
)
5852 switch (categorize_decl_for_section (decl
, reloc
, shlib
))
5855 case SECCAT_RODATA_MERGE_STR
:
5856 case SECCAT_RODATA_MERGE_STR_INIT
:
5857 case SECCAT_RODATA_MERGE_CONST
:
5858 case SECCAT_SRODATA
:
5867 /* Select a section based on the above categorization. */
5870 default_elf_select_section (tree decl
, int reloc
,
5871 unsigned HOST_WIDE_INT align
)
5873 return default_elf_select_section_1 (decl
, reloc
, align
, flag_pic
);
5877 default_elf_select_section_1 (tree decl
, int reloc
,
5878 unsigned HOST_WIDE_INT align
, int shlib
)
5881 switch (categorize_decl_for_section (decl
, reloc
, shlib
))
5884 /* We're not supposed to be called on FUNCTION_DECLs. */
5887 return readonly_data_section
;
5888 case SECCAT_RODATA_MERGE_STR
:
5889 return mergeable_string_section (decl
, align
, 0);
5890 case SECCAT_RODATA_MERGE_STR_INIT
:
5891 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
5892 case SECCAT_RODATA_MERGE_CONST
:
5893 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
5894 case SECCAT_SRODATA
:
5898 return data_section
;
5899 case SECCAT_DATA_REL
:
5900 sname
= ".data.rel";
5902 case SECCAT_DATA_REL_LOCAL
:
5903 sname
= ".data.rel.local";
5905 case SECCAT_DATA_REL_RO
:
5906 sname
= ".data.rel.ro";
5908 case SECCAT_DATA_REL_RO_LOCAL
:
5909 sname
= ".data.rel.ro.local";
5934 return get_named_section (decl
, sname
, reloc
);
5937 /* Construct a unique section name based on the decl name and the
5938 categorization performed above. */
5941 default_unique_section (tree decl
, int reloc
)
5943 default_unique_section_1 (decl
, reloc
, flag_pic
);
5947 default_unique_section_1 (tree decl
, int reloc
, int shlib
)
5949 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5950 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
5951 const char *prefix
, *name
;
5955 switch (categorize_decl_for_section (decl
, reloc
, shlib
))
5958 prefix
= one_only
? ".gnu.linkonce.t." : ".text.";
5961 case SECCAT_RODATA_MERGE_STR
:
5962 case SECCAT_RODATA_MERGE_STR_INIT
:
5963 case SECCAT_RODATA_MERGE_CONST
:
5964 prefix
= one_only
? ".gnu.linkonce.r." : ".rodata.";
5966 case SECCAT_SRODATA
:
5967 prefix
= one_only
? ".gnu.linkonce.s2." : ".sdata2.";
5970 prefix
= one_only
? ".gnu.linkonce.d." : ".data.";
5972 case SECCAT_DATA_REL
:
5973 prefix
= one_only
? ".gnu.linkonce.d.rel." : ".data.rel.";
5975 case SECCAT_DATA_REL_LOCAL
:
5976 prefix
= one_only
? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5978 case SECCAT_DATA_REL_RO
:
5979 prefix
= one_only
? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5981 case SECCAT_DATA_REL_RO_LOCAL
:
5982 prefix
= one_only
? ".gnu.linkonce.d.rel.ro.local."
5983 : ".data.rel.ro.local.";
5986 prefix
= one_only
? ".gnu.linkonce.s." : ".sdata.";
5989 prefix
= one_only
? ".gnu.linkonce.b." : ".bss.";
5992 prefix
= one_only
? ".gnu.linkonce.sb." : ".sbss.";
5995 prefix
= one_only
? ".gnu.linkonce.td." : ".tdata.";
5998 prefix
= one_only
? ".gnu.linkonce.tb." : ".tbss.";
6003 plen
= strlen (prefix
);
6005 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6006 name
= targetm
.strip_name_encoding (name
);
6007 nlen
= strlen (name
);
6009 string
= alloca (nlen
+ plen
+ 1);
6010 memcpy (string
, prefix
, plen
);
6011 memcpy (string
+ plen
, name
, nlen
+ 1);
6013 DECL_SECTION_NAME (decl
) = build_string (nlen
+ plen
, string
);
6017 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6019 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6022 switch (GET_CODE (x
))
6027 return data_section
;
6033 return readonly_data_section
;
6037 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6038 unsigned HOST_WIDE_INT align
)
6040 /* ??? Handle small data here somehow. */
6043 switch (GET_CODE (x
))
6047 return get_named_section (NULL
, ".data.rel.ro", 3);
6050 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6056 return mergeable_constant_section (mode
, align
, 0);
6059 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6062 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6067 /* Careful not to prod global register variables. */
6070 symbol
= XEXP (rtl
, 0);
6071 if (GET_CODE (symbol
) != SYMBOL_REF
)
6074 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6075 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6076 flags
|= SYMBOL_FLAG_FUNCTION
;
6077 if (targetm
.binds_local_p (decl
))
6078 flags
|= SYMBOL_FLAG_LOCAL
;
6079 if (targetm
.have_tls
&& TREE_CODE (decl
) == VAR_DECL
6080 && DECL_THREAD_LOCAL_P (decl
))
6081 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6082 else if (targetm
.in_small_data_p (decl
))
6083 flags
|= SYMBOL_FLAG_SMALL
;
6084 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6085 being PUBLIC, the thing *must* be defined in this translation unit.
6086 Prevent this buglet from being propagated into rtl code as well. */
6087 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6088 flags
|= SYMBOL_FLAG_EXTERNAL
;
6090 SYMBOL_REF_FLAGS (symbol
) = flags
;
6093 /* By default, we do nothing for encode_section_info, so we need not
6094 do anything but discard the '*' marker. */
6097 default_strip_name_encoding (const char *str
)
6099 return str
+ (*str
== '*');
6102 #ifdef ASM_OUTPUT_DEF
6103 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6104 anchor relative to ".", the current section position. */
6107 default_asm_output_anchor (rtx symbol
)
6111 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6112 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6113 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6117 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6120 default_use_anchors_for_symbol_p (rtx symbol
)
6125 /* Don't use anchors for mergeable sections. The linker might move
6126 the objects around. */
6127 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6128 if (sect
->common
.flags
& SECTION_MERGE
)
6131 /* Don't use anchors for small data sections. The small data register
6132 acts as an anchor for such sections. */
6133 if (sect
->common
.flags
& SECTION_SMALL
)
6136 decl
= SYMBOL_REF_DECL (symbol
);
6137 if (decl
&& DECL_P (decl
))
6139 /* Don't use section anchors for decls that might be defined by
6141 if (!targetm
.binds_local_p (decl
))
6144 /* Don't use section anchors for decls that will be placed in a
6145 small data section. */
6146 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6147 one above. The problem is that we only use SECTION_SMALL for
6148 sections that should be marked as small in the section directive. */
6149 if (targetm
.in_small_data_p (decl
))
6155 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6156 wrt cross-module name binding. */
6159 default_binds_local_p (tree exp
)
6161 return default_binds_local_p_1 (exp
, flag_shlib
);
6165 default_binds_local_p_1 (tree exp
, int shlib
)
6169 /* A non-decl is an entry in the constant pool. */
6172 /* Weakrefs may not bind locally, even though the weakref itself is
6173 always static and therefore local. */
6174 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
)))
6176 /* Static variables are always local. */
6177 else if (! TREE_PUBLIC (exp
))
6179 /* A variable is local if the user has said explicitly that it will
6181 else if (DECL_VISIBILITY_SPECIFIED (exp
)
6182 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6184 /* Variables defined outside this object might not be local. */
6185 else if (DECL_EXTERNAL (exp
))
6187 /* If defined in this object and visibility is not default, must be
6189 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6191 /* Default visibility weak data can be overridden by a strong symbol
6192 in another module and so are not local. */
6193 else if (DECL_WEAK (exp
))
6195 /* If PIC, then assume that any global name can be overridden by
6196 symbols resolved from other modules. */
6199 /* Uninitialized COMMON variable may be unified with symbols
6200 resolved from other modules. */
6201 else if (DECL_COMMON (exp
)
6202 && (DECL_INITIAL (exp
) == NULL
6203 || DECL_INITIAL (exp
) == error_mark_node
))
6205 /* Otherwise we're left with initialized (or non-common) global data
6206 which is of necessity defined locally. */
6213 /* Determine whether or not a pointer mode is valid. Assume defaults
6214 of ptr_mode or Pmode - can be overridden. */
6216 default_valid_pointer_mode (enum machine_mode mode
)
6218 return (mode
== ptr_mode
|| mode
== Pmode
);
6221 /* Default function to output code that will globalize a label. A
6222 target must define GLOBAL_ASM_OP or provide its own function to
6223 globalize a label. */
6224 #ifdef GLOBAL_ASM_OP
6226 default_globalize_label (FILE * stream
, const char *name
)
6228 fputs (GLOBAL_ASM_OP
, stream
);
6229 assemble_name (stream
, name
);
6230 putc ('\n', stream
);
6232 #endif /* GLOBAL_ASM_OP */
6234 /* Default function to output code that will globalize a declaration. */
6236 default_globalize_decl_name (FILE * stream
, tree decl
)
6238 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6239 targetm
.asm_out
.globalize_label (stream
, name
);
6242 /* Default function to output a label for unwind information. The
6243 default is to do nothing. A target that needs nonlocal labels for
6244 unwind information must provide its own function to do this. */
6246 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6247 tree decl ATTRIBUTE_UNUSED
,
6248 int for_eh ATTRIBUTE_UNUSED
,
6249 int empty ATTRIBUTE_UNUSED
)
6253 /* Default function to output a label to divide up the exception table.
6254 The default is to do nothing. A target that needs/wants to divide
6255 up the table must provide it's own function to do this. */
6257 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6261 /* This is how to output an internal numbered label where PREFIX is
6262 the class of label and LABELNO is the number within the class. */
6265 default_internal_label (FILE *stream
, const char *prefix
,
6266 unsigned long labelno
)
6268 char *const buf
= alloca (40 + strlen (prefix
));
6269 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6270 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6273 /* This is the default behavior at the beginning of a file. It's
6274 controlled by two other target-hook toggles. */
6276 default_file_start (void)
6278 if (targetm
.file_start_app_off
&& !flag_verbose_asm
)
6279 fputs (ASM_APP_OFF
, asm_out_file
);
6281 if (targetm
.file_start_file_directive
)
6282 output_file_directive (asm_out_file
, main_input_filename
);
6285 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6286 which emits a special section directive used to indicate whether or
6287 not this object file needs an executable stack. This is primarily
6288 a GNU extension to ELF but could be used on other targets. */
6290 int trampolines_created
;
6293 file_end_indicate_exec_stack (void)
6295 unsigned int flags
= SECTION_DEBUG
;
6296 if (trampolines_created
)
6297 flags
|= SECTION_CODE
;
6299 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6302 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6303 a get_unnamed_section callback. */
6306 output_section_asm_op (const void *directive
)
6308 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6311 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6312 the current section is NEW_SECTION. */
6315 switch_to_section (section
*new_section
)
6317 if (in_section
== new_section
)
6320 if (new_section
->common
.flags
& SECTION_FORGET
)
6323 in_section
= new_section
;
6325 switch (SECTION_STYLE (new_section
))
6329 && !cfun
->unlikely_text_section_name
6330 && strcmp (new_section
->named
.name
,
6331 UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
6332 cfun
->unlikely_text_section_name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
6334 targetm
.asm_out
.named_section (new_section
->named
.name
,
6335 new_section
->named
.common
.flags
,
6336 new_section
->named
.decl
);
6339 case SECTION_UNNAMED
:
6340 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6343 case SECTION_NOSWITCH
:
6348 new_section
->common
.flags
|= SECTION_DECLARED
;
6351 /* If block symbol SYMBOL has not yet been assigned an offset, place
6352 it at the end of its block. */
6355 place_block_symbol (rtx symbol
)
6357 unsigned HOST_WIDE_INT size
, mask
, offset
;
6358 struct constant_descriptor_rtx
*desc
;
6359 unsigned int alignment
;
6360 struct object_block
*block
;
6363 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6364 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6367 /* Work out the symbol's size and alignment. */
6368 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6370 desc
= SYMBOL_REF_CONSTANT (symbol
);
6371 alignment
= desc
->align
;
6372 size
= GET_MODE_SIZE (desc
->mode
);
6374 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6376 decl
= SYMBOL_REF_DECL (symbol
);
6377 alignment
= get_constant_alignment (decl
);
6378 size
= get_constant_size (decl
);
6382 decl
= SYMBOL_REF_DECL (symbol
);
6383 alignment
= DECL_ALIGN (decl
);
6384 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6387 /* Calculate the object's offset from the start of the block. */
6388 block
= SYMBOL_REF_BLOCK (symbol
);
6389 mask
= alignment
/ BITS_PER_UNIT
- 1;
6390 offset
= (block
->size
+ mask
) & ~mask
;
6391 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6393 /* Record the block's new alignment and size. */
6394 block
->alignment
= MAX (block
->alignment
, alignment
);
6395 block
->size
= offset
+ size
;
6397 VEC_safe_push (rtx
, gc
, block
->objects
, symbol
);
6400 /* Return the anchor that should be used to address byte offset OFFSET
6401 from the first object in BLOCK. MODEL is the TLS model used
6405 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
6406 enum tls_model model
)
6409 unsigned int begin
, middle
, end
;
6410 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
6413 /* Work out the anchor's offset. Use an offset of 0 for the first
6414 anchor so that we don't pessimize the case where we take the address
6415 of a variable at the beginning of the block. This is particularly
6416 useful when a block has only one variable assigned to it.
6418 We try to place anchors RANGE bytes apart, so there can then be
6419 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6420 a ptr_mode offset. With some target settings, the lowest such
6421 anchor might be out of range for the lowest ptr_mode offset;
6422 likewise the highest anchor for the highest offset. Use anchors
6423 at the extreme ends of the ptr_mode range in such cases.
6425 All arithmetic uses unsigned integers in order to avoid
6427 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
6428 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
6429 range
= max_offset
- min_offset
+ 1;
6434 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
6437 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
6438 delta
-= delta
% range
;
6441 offset
= (HOST_WIDE_INT
) (-delta
);
6445 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
6446 delta
-= delta
% range
;
6447 if (delta
> bias
- 1)
6449 offset
= (HOST_WIDE_INT
) delta
;
6453 /* Do a binary search to see if there's already an anchor we can use.
6454 Set BEGIN to the new anchor's index if not. */
6456 end
= VEC_length (rtx
, block
->anchors
);
6457 while (begin
!= end
)
6459 middle
= (end
+ begin
) / 2;
6460 anchor
= VEC_index (rtx
, block
->anchors
, middle
);
6461 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
6463 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
6465 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
6467 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
6473 /* Create a new anchor with a unique label. */
6474 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
6475 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
6476 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
6477 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
6479 /* Insert it at index BEGIN. */
6480 VEC_safe_insert (rtx
, gc
, block
->anchors
, begin
, anchor
);
6484 /* Output the objects in BLOCK. */
6487 output_object_block (struct object_block
*block
)
6489 struct constant_descriptor_rtx
*desc
;
6491 HOST_WIDE_INT offset
;
6495 if (block
->objects
== NULL
)
6498 /* Switch to the section and make sure that the first byte is
6499 suitably aligned. */
6500 switch_to_section (block
->sect
);
6501 assemble_align (block
->alignment
);
6503 /* Define the values of all anchors relative to the current section
6505 for (i
= 0; VEC_iterate (rtx
, block
->anchors
, i
, symbol
); i
++)
6506 targetm
.asm_out
.output_anchor (symbol
);
6508 /* Output the objects themselves. */
6510 for (i
= 0; VEC_iterate (rtx
, block
->objects
, i
, symbol
); i
++)
6512 /* Move to the object's offset, padding with zeros if necessary. */
6513 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
6514 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
6515 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6517 desc
= SYMBOL_REF_CONSTANT (symbol
);
6518 output_constant_pool_1 (desc
, 1);
6519 offset
+= GET_MODE_SIZE (desc
->mode
);
6521 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6523 decl
= SYMBOL_REF_DECL (symbol
);
6524 assemble_constant_contents (decl
, XSTR (symbol
, 0),
6525 get_constant_alignment (decl
));
6526 offset
+= get_constant_size (decl
);
6530 decl
= SYMBOL_REF_DECL (symbol
);
6531 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
6532 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6537 /* A htab_traverse callback used to call output_object_block for
6538 each member of object_block_htab. */
6541 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
6543 output_object_block ((struct object_block
*) (*slot
));
6547 /* Output the definitions of all object_blocks. */
6550 output_object_blocks (void)
6552 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
6555 /* This function provides a possible implementation of the
6556 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6557 by -frecord-gcc-switches it creates a new mergeable, string section in the
6558 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6559 contains the switches in ASCII format.
6561 FIXME: This code does not correctly handle double quote characters
6562 that appear inside strings, (it strips them rather than preserving them).
6563 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6564 characters - instead it treats them as sub-string separators. Since
6565 we want to emit NUL strings terminators into the object file we have to use
6569 elf_record_gcc_switches (print_switch_type type
, const char * name
)
6571 static char buffer
[1024];
6573 /* This variable is used as part of a simplistic heuristic to detect
6574 command line switches which take an argument:
6576 "If a command line option does not start with a dash then
6577 it is an argument for the previous command line option."
6579 This fails in the case of the command line option which is the name
6580 of the file to compile, but otherwise it is pretty reasonable. */
6581 static bool previous_name_held_back
= FALSE
;
6585 case SWITCH_TYPE_PASSED
:
6588 if (previous_name_held_back
)
6590 unsigned int len
= strlen (buffer
);
6592 snprintf (buffer
+ len
, sizeof buffer
- len
, " %s", name
);
6593 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6594 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6595 previous_name_held_back
= FALSE
;
6599 strncpy (buffer
, name
, sizeof buffer
);
6600 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6601 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6606 if (previous_name_held_back
)
6608 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6609 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6612 strncpy (buffer
, name
, sizeof buffer
);
6613 previous_name_held_back
= TRUE
;
6617 case SWITCH_TYPE_DESCRIPTIVE
:
6620 /* Distinguish between invocations where name is NULL. */
6621 static bool started
= false;
6625 if (previous_name_held_back
)
6627 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6628 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6635 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
6639 | (SECTION_ENTSIZE
& 1),
6641 switch_to_section (sec
);
6650 /* The return value is currently ignored by the caller, but must be 0.
6651 For -fverbose-asm the return value would be the number of characters
6652 emitted into the assembler file. */
6656 /* Emit text to declare externally defined symbols. It is needed to
6657 properly support non-default visibility. */
6659 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
6661 const char *name ATTRIBUTE_UNUSED
)
6663 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6664 set in order to avoid putting out names that are never really
6666 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
6667 && targetm
.binds_local_p (decl
))
6668 maybe_assemble_visibility (decl
);
6671 #include "gt-varasm.h"