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 3, 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 COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* This file handles generation of all the assembler code
24 *except* the instructions of a function.
25 This includes declarations of variables and their initial values.
27 We also output the assembler code for constants stored in memory
28 and are responsible for combining constants with the same value. */
32 #include "coretypes.h"
39 #include "hard-reg-set.h"
47 #include "langhooks.h"
51 #include "targhooks.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 #define n_deferred_constants (crtl->varasm.deferred_constants)
76 /* Number for making the label on the next
77 constant that is stored in memory. */
79 static GTY(()) int const_labelno
;
81 /* Carry information from ASM_DECLARE_OBJECT_NAME
82 to ASM_FINISH_DECLARE_OBJECT. */
84 int size_directive_output
;
86 /* The last decl for which assemble_variable was called,
87 if it did ASM_DECLARE_OBJECT_NAME.
88 If the last call to assemble_variable didn't do that,
91 tree last_assemble_variable_decl
;
93 /* The following global variable indicates if the first basic block
94 in a function belongs to the cold partition or not. */
96 bool first_function_block_is_cold
;
98 /* We give all constants their own alias set. Perhaps redundant with
99 MEM_READONLY_P, but pre-dates it. */
101 static alias_set_type const_alias_set
;
103 static const char *strip_reg_name (const char *);
104 static int contains_pointers_p (tree
);
105 #ifdef ASM_OUTPUT_EXTERNAL
106 static bool incorporeal_function_p (tree
);
108 static void decode_addr_const (tree
, struct addr_const
*);
109 static hashval_t
const_desc_hash (const void *);
110 static int const_desc_eq (const void *, const void *);
111 static hashval_t
const_hash_1 (const tree
);
112 static int compare_constant (const tree
, const tree
);
113 static tree
copy_constant (tree
);
114 static void output_constant_def_contents (rtx
);
115 static void output_addressed_constants (tree
);
116 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
117 static unsigned min_align (unsigned, unsigned);
118 static void output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int);
119 static void globalize_decl (tree
);
120 #ifdef BSS_SECTION_ASM_OP
121 #ifdef ASM_OUTPUT_BSS
122 static void asm_output_bss (FILE *, tree
, const char *,
123 unsigned HOST_WIDE_INT
, unsigned HOST_WIDE_INT
);
125 #ifdef ASM_OUTPUT_ALIGNED_BSS
126 static void asm_output_aligned_bss (FILE *, tree
, const char *,
127 unsigned HOST_WIDE_INT
, int)
130 #endif /* BSS_SECTION_ASM_OP */
131 static void mark_weak (tree
);
132 static void output_constant_pool (const char *, tree
);
134 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
135 section
*text_section
;
136 section
*data_section
;
137 section
*readonly_data_section
;
138 section
*sdata_section
;
139 section
*ctors_section
;
140 section
*dtors_section
;
141 section
*bss_section
;
142 section
*sbss_section
;
144 /* Various forms of common section. All are guaranteed to be nonnull. */
145 section
*tls_comm_section
;
146 section
*comm_section
;
147 section
*lcomm_section
;
149 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
151 section
*bss_noswitch_section
;
153 /* The section that holds the main exception table, when known. The section
154 is set either by the target's init_sections hook or by the first call to
155 switch_to_exception_section. */
156 section
*exception_section
;
158 /* The section that holds the DWARF2 frame unwind information, when known.
159 The section is set either by the target's init_sections hook or by the
160 first call to switch_to_eh_frame_section. */
161 section
*eh_frame_section
;
163 /* asm_out_file's current section. This is NULL if no section has yet
164 been selected or if we lose track of what the current section is. */
167 /* True if code for the current function is currently being directed
168 at the cold section. */
169 bool in_cold_section_p
;
171 /* A linked list of all the unnamed sections. */
172 static GTY(()) section
*unnamed_sections
;
174 /* Return a nonzero value if DECL has a section attribute. */
175 #ifndef IN_NAMED_SECTION
176 #define IN_NAMED_SECTION(DECL) \
177 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
178 && DECL_SECTION_NAME (DECL) != NULL_TREE)
181 /* Hash table of named sections. */
182 static GTY((param_is (section
))) htab_t section_htab
;
184 /* A table of object_blocks, indexed by section. */
185 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
187 /* The next number to use for internal anchor labels. */
188 static GTY(()) int anchor_labelno
;
190 /* A pool of constants that can be shared between functions. */
191 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
195 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
197 static GTY (()) tree emutls_object_type
;
198 /* Emulated TLS objects have the TLS model TLS_MODEL_EMULATED. This
199 macro can be used on them to distinguish the control variable from
200 the initialization template. */
201 #define DECL_EMUTLS_VAR_P(D) (TREE_TYPE (D) == emutls_object_type)
203 #if !defined (NO_DOT_IN_LABEL)
204 # define EMUTLS_SEPARATOR "."
205 #elif !defined (NO_DOLLAR_IN_LABEL)
206 # define EMUTLS_SEPARATOR "$"
208 # define EMUTLS_SEPARATOR "_"
211 /* Create an IDENTIFIER_NODE by prefixing PREFIX to the
212 IDENTIFIER_NODE NAME's name. */
215 prefix_name (const char *prefix
, tree name
)
217 unsigned plen
= strlen (prefix
);
218 unsigned nlen
= strlen (IDENTIFIER_POINTER (name
));
219 char *toname
= (char *) alloca (plen
+ nlen
+ 1);
221 memcpy (toname
, prefix
, plen
);
222 memcpy (toname
+ plen
, IDENTIFIER_POINTER (name
), nlen
+ 1);
224 return get_identifier (toname
);
227 /* Create an identifier for the struct __emutls_object, given an identifier
228 of the DECL_ASSEMBLY_NAME of the original object. */
231 get_emutls_object_name (tree name
)
233 const char *prefix
= (targetm
.emutls
.var_prefix
234 ? targetm
.emutls
.var_prefix
235 : "__emutls_v" EMUTLS_SEPARATOR
);
236 return prefix_name (prefix
, name
);
240 default_emutls_var_fields (tree type
, tree
*name ATTRIBUTE_UNUSED
)
242 tree word_type_node
, field
, next_field
;
244 field
= build_decl (FIELD_DECL
, get_identifier ("__templ"), ptr_type_node
);
245 DECL_CONTEXT (field
) = type
;
248 field
= build_decl (FIELD_DECL
, get_identifier ("__offset"),
250 DECL_CONTEXT (field
) = type
;
251 TREE_CHAIN (field
) = next_field
;
254 word_type_node
= lang_hooks
.types
.type_for_mode (word_mode
, 1);
255 field
= build_decl (FIELD_DECL
, get_identifier ("__align"),
257 DECL_CONTEXT (field
) = type
;
258 TREE_CHAIN (field
) = next_field
;
261 field
= build_decl (FIELD_DECL
, get_identifier ("__size"), word_type_node
);
262 DECL_CONTEXT (field
) = type
;
263 TREE_CHAIN (field
) = next_field
;
268 /* Create the structure for struct __emutls_object. This should match the
269 structure at the top of emutls.c, modulo the union there. */
272 get_emutls_object_type (void)
274 tree type
, type_name
, field
;
276 type
= emutls_object_type
;
280 emutls_object_type
= type
= lang_hooks
.types
.make_type (RECORD_TYPE
);
282 field
= targetm
.emutls
.var_fields (type
, &type_name
);
284 type_name
= get_identifier ("__emutls_object");
285 type_name
= build_decl (TYPE_DECL
, type_name
, type
);
286 TYPE_NAME (type
) = type_name
;
287 TYPE_FIELDS (type
) = field
;
293 /* Create a read-only variable like DECL, with the same DECL_INITIAL.
294 This will be used for initializing the emulated tls data area. */
297 get_emutls_init_templ_addr (tree decl
)
301 if (targetm
.emutls
.register_common
&& !DECL_INITIAL (decl
)
302 && !DECL_SECTION_NAME (decl
))
303 return null_pointer_node
;
305 name
= DECL_ASSEMBLER_NAME (decl
);
306 if (!targetm
.emutls
.tmpl_prefix
|| targetm
.emutls
.tmpl_prefix
[0])
308 const char *prefix
= (targetm
.emutls
.tmpl_prefix
309 ? targetm
.emutls
.tmpl_prefix
310 : "__emutls_t" EMUTLS_SEPARATOR
);
311 name
= prefix_name (prefix
, name
);
314 to
= build_decl (VAR_DECL
, name
, TREE_TYPE (decl
));
315 SET_DECL_ASSEMBLER_NAME (to
, DECL_NAME (to
));
316 DECL_TLS_MODEL (to
) = TLS_MODEL_EMULATED
;
317 DECL_ARTIFICIAL (to
) = 1;
318 TREE_USED (to
) = TREE_USED (decl
);
319 TREE_READONLY (to
) = 1;
320 DECL_IGNORED_P (to
) = 1;
321 DECL_CONTEXT (to
) = DECL_CONTEXT (decl
);
322 DECL_SECTION_NAME (to
) = DECL_SECTION_NAME (decl
);
324 DECL_WEAK (to
) = DECL_WEAK (decl
);
325 if (DECL_ONE_ONLY (decl
))
327 make_decl_one_only (to
);
328 TREE_STATIC (to
) = TREE_STATIC (decl
);
329 TREE_PUBLIC (to
) = TREE_PUBLIC (decl
);
330 DECL_VISIBILITY (to
) = DECL_VISIBILITY (decl
);
333 TREE_STATIC (to
) = 1;
335 DECL_INITIAL (to
) = DECL_INITIAL (decl
);
336 DECL_INITIAL (decl
) = NULL
;
338 varpool_finalize_decl (to
);
339 return build_fold_addr_expr (to
);
342 /* When emulating tls, we use a control structure for use by the runtime.
343 Create and return this structure. */
346 emutls_decl (tree decl
)
349 struct tree_map
*h
, in
;
352 if (targetm
.have_tls
|| decl
== NULL
|| decl
== error_mark_node
353 || TREE_CODE (decl
) != VAR_DECL
|| ! DECL_THREAD_LOCAL_P (decl
))
356 /* Look up the object in the hash; return the control structure if
357 it has already been created. */
359 emutls_htab
= htab_create_ggc (512, tree_map_hash
, tree_map_eq
, 0);
361 name
= DECL_ASSEMBLER_NAME (decl
);
363 /* Note that we use the hash of the decl's name, rather than a hash
364 of the decl's pointer. In emutls_finish we iterate through the
365 hash table, and we want this traversal to be predictable. */
366 in
.hash
= htab_hash_string (IDENTIFIER_POINTER (name
));
368 loc
= htab_find_slot_with_hash (emutls_htab
, &in
, in
.hash
, INSERT
);
369 h
= (struct tree_map
*) *loc
;
374 to
= build_decl (VAR_DECL
, get_emutls_object_name (name
),
375 get_emutls_object_type ());
377 h
= GGC_NEW (struct tree_map
);
381 *(struct tree_map
**) loc
= h
;
383 DECL_TLS_MODEL (to
) = TLS_MODEL_EMULATED
;
384 DECL_ARTIFICIAL (to
) = 1;
385 DECL_IGNORED_P (to
) = 1;
386 TREE_READONLY (to
) = 0;
387 SET_DECL_ASSEMBLER_NAME (to
, DECL_NAME (to
));
388 if (DECL_ONE_ONLY (decl
))
389 make_decl_one_only (to
);
390 DECL_CONTEXT (to
) = DECL_CONTEXT (decl
);
391 if (targetm
.emutls
.var_align_fixed
)
392 /* If we're not allowed to change the proxy object's
393 alignment, pretend it's been set by the user. */
394 DECL_USER_ALIGN (to
) = 1;
397 /* Note that these fields may need to be updated from time to time from
398 the original decl. Consider:
399 extern __thread int i;
400 int foo() { return i; }
402 in which I goes from external to locally defined and initialized. */
404 TREE_STATIC (to
) = TREE_STATIC (decl
);
405 TREE_USED (to
) = TREE_USED (decl
);
406 TREE_PUBLIC (to
) = TREE_PUBLIC (decl
);
407 DECL_EXTERNAL (to
) = DECL_EXTERNAL (decl
);
408 DECL_COMMON (to
) = DECL_COMMON (decl
);
409 DECL_WEAK (to
) = DECL_WEAK (decl
);
410 DECL_VISIBILITY (to
) = DECL_VISIBILITY (decl
);
416 emutls_common_1 (void **loc
, void *xstmts
)
418 struct tree_map
*h
= *(struct tree_map
**) loc
;
419 tree args
, x
, *pstmts
= (tree
*) xstmts
;
422 if (! DECL_COMMON (h
->base
.from
)
423 || (DECL_INITIAL (h
->base
.from
)
424 && DECL_INITIAL (h
->base
.from
) != error_mark_node
))
427 word_type_node
= lang_hooks
.types
.type_for_mode (word_mode
, 1);
429 /* The idea was to call get_emutls_init_templ_addr here, but if we
430 do this and there is an initializer, -fanchor_section loses,
431 because it would be too late to ensure the template is
433 x
= null_pointer_node
;
434 args
= tree_cons (NULL
, x
, NULL
);
435 x
= build_int_cst (word_type_node
, DECL_ALIGN_UNIT (h
->base
.from
));
436 args
= tree_cons (NULL
, x
, args
);
437 x
= fold_convert (word_type_node
, DECL_SIZE_UNIT (h
->base
.from
));
438 args
= tree_cons (NULL
, x
, args
);
439 x
= build_fold_addr_expr (h
->to
);
440 args
= tree_cons (NULL
, x
, args
);
442 x
= built_in_decls
[BUILT_IN_EMUTLS_REGISTER_COMMON
];
443 x
= build_function_call_expr (x
, args
);
445 append_to_statement_list (x
, pstmts
);
452 if (!targetm
.emutls
.register_common
)
454 tree body
= NULL_TREE
;
456 if (emutls_htab
== NULL
)
459 htab_traverse_noresize (emutls_htab
, emutls_common_1
, &body
);
460 if (body
== NULL_TREE
)
463 cgraph_build_static_cdtor ('I', body
, DEFAULT_INIT_PRIORITY
);
467 /* Helper routines for maintaining section_htab. */
470 section_entry_eq (const void *p1
, const void *p2
)
472 const section
*old
= (const section
*) p1
;
473 const char *new_name
= (const char *) p2
;
475 return strcmp (old
->named
.name
, new_name
) == 0;
479 section_entry_hash (const void *p
)
481 const section
*old
= (const section
*) p
;
482 return htab_hash_string (old
->named
.name
);
485 /* Return a hash value for section SECT. */
488 hash_section (section
*sect
)
490 if (sect
->common
.flags
& SECTION_NAMED
)
491 return htab_hash_string (sect
->named
.name
);
492 return sect
->common
.flags
;
495 /* Helper routines for maintaining object_block_htab. */
498 object_block_entry_eq (const void *p1
, const void *p2
)
500 const struct object_block
*old
= (const struct object_block
*) p1
;
501 const section
*new_section
= (const section
*) p2
;
503 return old
->sect
== new_section
;
507 object_block_entry_hash (const void *p
)
509 const struct object_block
*old
= (const struct object_block
*) p
;
510 return hash_section (old
->sect
);
513 /* Return a new unnamed section with the given fields. */
516 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
521 sect
= GGC_NEW (section
);
522 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
523 sect
->unnamed
.callback
= callback
;
524 sect
->unnamed
.data
= data
;
525 sect
->unnamed
.next
= unnamed_sections
;
527 unnamed_sections
= sect
;
531 /* Return a SECTION_NOSWITCH section with the given fields. */
534 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
538 sect
= GGC_NEW (section
);
539 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
540 sect
->noswitch
.callback
= callback
;
545 /* Return the named section structure associated with NAME. Create
546 a new section with the given fields if no such structure exists. */
549 get_section (const char *name
, unsigned int flags
, tree decl
)
551 section
*sect
, **slot
;
554 htab_find_slot_with_hash (section_htab
, name
,
555 htab_hash_string (name
), INSERT
);
556 flags
|= SECTION_NAMED
;
559 sect
= GGC_NEW (section
);
560 sect
->named
.common
.flags
= flags
;
561 sect
->named
.name
= ggc_strdup (name
);
562 sect
->named
.decl
= decl
;
568 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
569 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
571 /* Sanity check user variables for flag changes. */
573 decl
= sect
->named
.decl
;
575 error ("%+D causes a section type conflict", decl
);
581 /* Return true if the current compilation mode benefits from having
582 objects grouped into blocks. */
585 use_object_blocks_p (void)
587 return flag_section_anchors
;
590 /* Return the object_block structure for section SECT. Create a new
591 structure if we haven't created one already. Return null if SECT
594 static struct object_block
*
595 get_block_for_section (section
*sect
)
597 struct object_block
*block
;
603 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
604 hash_section (sect
), INSERT
);
605 block
= (struct object_block
*) *slot
;
608 block
= (struct object_block
*)
609 ggc_alloc_cleared (sizeof (struct object_block
));
616 /* Create a symbol with label LABEL and place it at byte offset
617 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
618 is not yet known. LABEL must be a garbage-collected string. */
621 create_block_symbol (const char *label
, struct object_block
*block
,
622 HOST_WIDE_INT offset
)
627 /* Create the extended SYMBOL_REF. */
628 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
629 symbol
= (rtx
) ggc_alloc_zone (size
, &rtl_zone
);
631 /* Initialize the normal SYMBOL_REF fields. */
632 memset (symbol
, 0, size
);
633 PUT_CODE (symbol
, SYMBOL_REF
);
634 PUT_MODE (symbol
, Pmode
);
635 XSTR (symbol
, 0) = label
;
636 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
638 /* Initialize the block_symbol stuff. */
639 SYMBOL_REF_BLOCK (symbol
) = block
;
640 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
646 initialize_cold_section_name (void)
648 const char *stripped_name
;
652 gcc_assert (cfun
&& current_function_decl
);
653 if (crtl
->subsections
.unlikely_text_section_name
)
656 dsn
= DECL_SECTION_NAME (current_function_decl
);
657 if (flag_function_sections
&& dsn
)
659 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
660 memcpy (name
, TREE_STRING_POINTER (dsn
), TREE_STRING_LENGTH (dsn
) + 1);
662 stripped_name
= targetm
.strip_name_encoding (name
);
664 buffer
= ACONCAT ((stripped_name
, "_unlikely", NULL
));
665 crtl
->subsections
.unlikely_text_section_name
= ggc_strdup (buffer
);
668 crtl
->subsections
.unlikely_text_section_name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
671 /* Tell assembler to switch to unlikely-to-be-executed text section. */
674 unlikely_text_section (void)
678 if (!crtl
->subsections
.unlikely_text_section_name
)
679 initialize_cold_section_name ();
681 return get_named_section (NULL
, crtl
->subsections
.unlikely_text_section_name
, 0);
684 return get_named_section (NULL
, UNLIKELY_EXECUTED_TEXT_SECTION_NAME
, 0);
687 /* When called within a function context, return true if the function
688 has been assigned a cold text section and if SECT is that section.
689 When called outside a function context, return true if SECT is the
690 default cold section. */
693 unlikely_text_section_p (section
*sect
)
698 name
= crtl
->subsections
.unlikely_text_section_name
;
700 name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
704 && SECTION_STYLE (sect
) == SECTION_NAMED
705 && strcmp (name
, sect
->named
.name
) == 0);
708 /* Return a section with a particular name and with whatever SECTION_*
709 flags section_type_flags deems appropriate. The name of the section
710 is taken from NAME if nonnull, otherwise it is taken from DECL's
711 DECL_SECTION_NAME. DECL is the decl associated with the section
712 (see the section comment for details) and RELOC is as for
713 section_type_flags. */
716 get_named_section (tree decl
, const char *name
, int reloc
)
720 gcc_assert (!decl
|| DECL_P (decl
));
722 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
724 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
726 return get_section (name
, flags
, decl
);
729 /* If required, set DECL_SECTION_NAME to a unique name. */
732 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
733 int flag_function_or_data_sections
)
735 if (DECL_SECTION_NAME (decl
) == NULL_TREE
736 && targetm
.have_named_sections
737 && (flag_function_or_data_sections
738 || DECL_ONE_ONLY (decl
)))
739 targetm
.asm_out
.unique_section (decl
, reloc
);
742 #ifdef BSS_SECTION_ASM_OP
744 #ifdef ASM_OUTPUT_BSS
746 /* Utility function for ASM_OUTPUT_BSS for targets to use if
747 they don't support alignments in .bss.
748 ??? It is believed that this function will work in most cases so such
749 support is localized here. */
752 asm_output_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
754 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
755 unsigned HOST_WIDE_INT rounded
)
757 gcc_assert (strcmp (XSTR (XEXP (DECL_RTL (decl
), 0), 0), name
) == 0);
758 targetm
.asm_out
.globalize_decl_name (file
, decl
);
759 switch_to_section (bss_section
);
760 #ifdef ASM_DECLARE_OBJECT_NAME
761 last_assemble_variable_decl
= decl
;
762 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
764 /* Standard thing is just output label for the object. */
765 ASM_OUTPUT_LABEL (file
, name
);
766 #endif /* ASM_DECLARE_OBJECT_NAME */
767 ASM_OUTPUT_SKIP (file
, rounded
? rounded
: 1);
772 #ifdef ASM_OUTPUT_ALIGNED_BSS
774 /* Utility function for targets to use in implementing
775 ASM_OUTPUT_ALIGNED_BSS.
776 ??? It is believed that this function will work in most cases so such
777 support is localized here. */
780 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
781 const char *name
, unsigned HOST_WIDE_INT size
,
784 switch_to_section (bss_section
);
785 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
786 #ifdef ASM_DECLARE_OBJECT_NAME
787 last_assemble_variable_decl
= decl
;
788 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
790 /* Standard thing is just output label for the object. */
791 ASM_OUTPUT_LABEL (file
, name
);
792 #endif /* ASM_DECLARE_OBJECT_NAME */
793 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
798 #endif /* BSS_SECTION_ASM_OP */
800 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
801 /* Return the hot section for function DECL. Return text_section for
805 hot_function_section (tree decl
)
807 if (decl
!= NULL_TREE
808 && DECL_SECTION_NAME (decl
) != NULL_TREE
809 && targetm
.have_named_sections
)
810 return get_named_section (decl
, NULL
, 0);
816 /* Return the section for function DECL.
818 If DECL is NULL_TREE, return the text section. We can be passed
819 NULL_TREE under some circumstances by dbxout.c at least. */
822 function_section (tree decl
)
826 if (first_function_block_is_cold
)
829 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
830 if (decl
!= NULL_TREE
831 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
832 return reloc
? unlikely_text_section ()
833 : get_named_section (decl
, NULL
, 0);
835 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
837 return reloc
? unlikely_text_section () : hot_function_section (decl
);
842 current_function_section (void)
844 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
845 if (current_function_decl
!= NULL_TREE
846 && DECL_SECTION_NAME (current_function_decl
) != NULL_TREE
)
847 return in_cold_section_p
? unlikely_text_section ()
848 : get_named_section (current_function_decl
,
851 return targetm
.asm_out
.select_section (current_function_decl
,
853 DECL_ALIGN (current_function_decl
));
855 return (in_cold_section_p
856 ? unlikely_text_section ()
857 : hot_function_section (current_function_decl
));
861 /* Return the read-only data section associated with function DECL. */
864 default_function_rodata_section (tree decl
)
866 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
868 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
870 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
872 size_t len
= strlen (name
) + 3;
873 char* rname
= (char *) alloca (len
);
875 strcpy (rname
, ".rodata");
876 strcat (rname
, name
+ 5);
877 return get_section (rname
, SECTION_LINKONCE
, decl
);
879 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
880 else if (DECL_ONE_ONLY (decl
)
881 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
883 size_t len
= strlen (name
) + 1;
884 char *rname
= (char *) alloca (len
);
886 memcpy (rname
, name
, len
);
888 return get_section (rname
, SECTION_LINKONCE
, decl
);
890 /* For .text.foo we want to use .rodata.foo. */
891 else if (flag_function_sections
&& flag_data_sections
892 && strncmp (name
, ".text.", 6) == 0)
894 size_t len
= strlen (name
) + 1;
895 char *rname
= (char *) alloca (len
+ 2);
897 memcpy (rname
, ".rodata", 7);
898 memcpy (rname
+ 7, name
+ 5, len
- 5);
899 return get_section (rname
, 0, decl
);
903 return readonly_data_section
;
906 /* Return the read-only data section associated with function DECL
907 for targets where that section should be always the single
908 readonly data section. */
911 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
913 return readonly_data_section
;
916 /* Return the section to use for string merging. */
919 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
920 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
921 unsigned int flags ATTRIBUTE_UNUSED
)
925 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
926 && TREE_CODE (decl
) == STRING_CST
927 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
929 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
930 && TREE_STRING_LENGTH (decl
) >= len
)
932 enum machine_mode mode
;
933 unsigned int modesize
;
939 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
940 modesize
= GET_MODE_BITSIZE (mode
);
941 if (modesize
>= 8 && modesize
<= 256
942 && (modesize
& (modesize
- 1)) == 0)
944 if (align
< modesize
)
947 str
= TREE_STRING_POINTER (decl
);
948 unit
= GET_MODE_SIZE (mode
);
950 /* Check for embedded NUL characters. */
951 for (i
= 0; i
< len
; i
+= unit
)
953 for (j
= 0; j
< unit
; j
++)
954 if (str
[i
+ j
] != '\0')
961 sprintf (name
, ".rodata.str%d.%d", modesize
/ 8,
963 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
964 return get_section (name
, flags
, NULL
);
969 return readonly_data_section
;
972 /* Return the section to use for constant merging. */
975 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
976 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
977 unsigned int flags ATTRIBUTE_UNUSED
)
979 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
981 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
987 && (align
& (align
- 1)) == 0)
991 sprintf (name
, ".rodata.cst%d", (int) (align
/ 8));
992 flags
|= (align
/ 8) | SECTION_MERGE
;
993 return get_section (name
, flags
, NULL
);
995 return readonly_data_section
;
998 /* Given NAME, a putative register name, discard any customary prefixes. */
1001 strip_reg_name (const char *name
)
1003 #ifdef REGISTER_PREFIX
1004 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
1005 name
+= strlen (REGISTER_PREFIX
);
1007 if (name
[0] == '%' || name
[0] == '#')
1012 /* The user has asked for a DECL to have a particular name. Set (or
1013 change) it in such a way that we don't prefix an underscore to
1016 set_user_assembler_name (tree decl
, const char *name
)
1018 char *starred
= (char *) alloca (strlen (name
) + 2);
1020 strcpy (starred
+ 1, name
);
1021 change_decl_assembler_name (decl
, get_identifier (starred
));
1022 SET_DECL_RTL (decl
, NULL_RTX
);
1025 /* Decode an `asm' spec for a declaration as a register name.
1026 Return the register number, or -1 if nothing specified,
1027 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
1028 or -3 if ASMSPEC is `cc' and is not recognized,
1029 or -4 if ASMSPEC is `memory' and is not recognized.
1030 Accept an exact spelling or a decimal number.
1031 Prefixes such as % are optional. */
1034 decode_reg_name (const char *asmspec
)
1040 /* Get rid of confusing prefixes. */
1041 asmspec
= strip_reg_name (asmspec
);
1043 /* Allow a decimal number as a "register name". */
1044 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
1045 if (! ISDIGIT (asmspec
[i
]))
1047 if (asmspec
[0] != 0 && i
< 0)
1050 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
1056 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
1058 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
1061 #ifdef ADDITIONAL_REGISTER_NAMES
1063 static const struct { const char *const name
; const int number
; } table
[]
1064 = ADDITIONAL_REGISTER_NAMES
;
1066 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
1067 if (table
[i
].name
[0]
1068 && ! strcmp (asmspec
, table
[i
].name
))
1069 return table
[i
].number
;
1071 #endif /* ADDITIONAL_REGISTER_NAMES */
1073 if (!strcmp (asmspec
, "memory"))
1076 if (!strcmp (asmspec
, "cc"))
1085 /* Return true if DECL's initializer is suitable for a BSS section. */
1088 bss_initializer_p (const_tree decl
)
1090 return (DECL_INITIAL (decl
) == NULL
1091 || DECL_INITIAL (decl
) == error_mark_node
1092 || (flag_zero_initialized_in_bss
1093 /* Leave constant zeroes in .rodata so they
1095 && !TREE_READONLY (decl
)
1096 && initializer_zerop (DECL_INITIAL (decl
))));
1099 /* Compute the alignment of variable specified by DECL.
1100 DONT_OUTPUT_DATA is from assemble_variable. */
1103 align_variable (tree decl
, bool dont_output_data
)
1105 unsigned int align
= DECL_ALIGN (decl
);
1107 /* In the case for initialing an array whose length isn't specified,
1108 where we have not yet been able to do the layout,
1109 figure out the proper alignment now. */
1110 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1111 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1112 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1114 /* Some object file formats have a maximum alignment which they support.
1115 In particular, a.out format supports a maximum alignment of 4. */
1116 if (align
> MAX_OFILE_ALIGNMENT
)
1118 warning (0, "alignment of %q+D is greater than maximum object "
1119 "file alignment. Using %d", decl
,
1120 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1121 align
= MAX_OFILE_ALIGNMENT
;
1124 /* On some machines, it is good to increase alignment sometimes. */
1125 if (! DECL_USER_ALIGN (decl
))
1127 #ifdef DATA_ALIGNMENT
1128 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1129 /* Don't increase alignment too much for TLS variables - TLS space
1131 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1134 #ifdef CONSTANT_ALIGNMENT
1135 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
1137 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1139 /* Don't increase alignment too much for TLS variables - TLS space
1141 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1142 align
= const_align
;
1147 /* Reset the alignment in case we have made it tighter, so we can benefit
1148 from it in get_pointer_alignment. */
1149 DECL_ALIGN (decl
) = align
;
1152 /* Return the section into which the given VAR_DECL or CONST_DECL
1153 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1154 section should be used wherever possible. */
1157 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1161 /* If the decl has been given an explicit section name, then it
1162 isn't common, and shouldn't be handled as such. */
1163 if (DECL_COMMON (decl
) && DECL_SECTION_NAME (decl
) == NULL
)
1165 if (DECL_THREAD_LOCAL_P (decl
))
1166 return tls_comm_section
;
1167 /* This cannot be common bss for an emulated TLS object without
1168 a register_common hook. */
1169 else if (DECL_TLS_MODEL (decl
) == TLS_MODEL_EMULATED
1170 && !targetm
.emutls
.register_common
)
1172 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1173 return comm_section
;
1176 if (DECL_INITIAL (decl
) == error_mark_node
)
1177 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1178 else if (DECL_INITIAL (decl
))
1179 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1183 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1184 if (IN_NAMED_SECTION (decl
))
1185 return get_named_section (decl
, NULL
, reloc
);
1187 if (!DECL_THREAD_LOCAL_P (decl
)
1188 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1189 && bss_initializer_p (decl
))
1191 if (!TREE_PUBLIC (decl
))
1192 return lcomm_section
;
1193 if (bss_noswitch_section
)
1194 return bss_noswitch_section
;
1197 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1200 /* Return the block into which object_block DECL should be placed. */
1202 static struct object_block
*
1203 get_block_for_decl (tree decl
)
1207 if (TREE_CODE (decl
) == VAR_DECL
)
1209 /* The object must be defined in this translation unit. */
1210 if (DECL_EXTERNAL (decl
))
1213 /* There's no point using object blocks for something that is
1214 isolated by definition. */
1215 if (DECL_ONE_ONLY (decl
))
1219 /* We can only calculate block offsets if the decl has a known
1221 if (DECL_SIZE_UNIT (decl
) == NULL
)
1223 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1226 /* Find out which section should contain DECL. We cannot put it into
1227 an object block if it requires a standalone definition. */
1228 if (TREE_CODE (decl
) == VAR_DECL
)
1229 align_variable (decl
, 0);
1230 sect
= get_variable_section (decl
, true);
1231 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1234 return get_block_for_section (sect
);
1237 /* Make sure block symbol SYMBOL is in block BLOCK. */
1240 change_symbol_block (rtx symbol
, struct object_block
*block
)
1242 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1244 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1245 SYMBOL_REF_BLOCK (symbol
) = block
;
1249 /* Return true if it is possible to put DECL in an object_block. */
1252 use_blocks_for_decl_p (tree decl
)
1254 /* Only data DECLs can be placed into object blocks. */
1255 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1258 /* Detect decls created by dw2_force_const_mem. Such decls are
1259 special because DECL_INITIAL doesn't specify the decl's true value.
1260 dw2_output_indirect_constants will instead call assemble_variable
1261 with dont_output_data set to 1 and then print the contents itself. */
1262 if (DECL_INITIAL (decl
) == decl
)
1265 /* If this decl is an alias, then we don't want to emit a definition. */
1266 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1272 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1273 have static storage duration. In other words, it should not be an
1274 automatic variable, including PARM_DECLs.
1276 There is, however, one exception: this function handles variables
1277 explicitly placed in a particular register by the user.
1279 This is never called for PARM_DECL nodes. */
1282 make_decl_rtl (tree decl
)
1284 const char *name
= 0;
1288 /* Check that we are not being given an automatic variable. */
1289 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1290 && TREE_CODE (decl
) != RESULT_DECL
);
1292 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1293 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1294 || TREE_STATIC (decl
)
1295 || TREE_PUBLIC (decl
)
1296 || DECL_EXTERNAL (decl
)
1297 || DECL_REGISTER (decl
));
1299 /* And that we were not given a type or a label. */
1300 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1301 && TREE_CODE (decl
) != LABEL_DECL
);
1303 /* For a duplicate declaration, we can be called twice on the
1304 same DECL node. Don't discard the RTL already made. */
1305 if (DECL_RTL_SET_P (decl
))
1307 /* If the old RTL had the wrong mode, fix the mode. */
1308 x
= DECL_RTL (decl
);
1309 if (GET_MODE (x
) != DECL_MODE (decl
))
1310 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1312 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1315 /* ??? Another way to do this would be to maintain a hashed
1316 table of such critters. Instead of adding stuff to a DECL
1317 to give certain attributes to it, we could use an external
1318 hash map from DECL to set of attributes. */
1320 /* Let the target reassign the RTL if it wants.
1321 This is necessary, for example, when one machine specific
1322 decl attribute overrides another. */
1323 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1325 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1326 on the new decl information. */
1328 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1329 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1330 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1332 /* Make this function static known to the mudflap runtime. */
1333 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1334 mudflap_enqueue_decl (decl
);
1339 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1341 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1342 && DECL_REGISTER (decl
))
1344 error ("register name not specified for %q+D", decl
);
1346 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1348 const char *asmspec
= name
+1;
1349 reg_number
= decode_reg_name (asmspec
);
1350 /* First detect errors in declaring global registers. */
1351 if (reg_number
== -1)
1352 error ("register name not specified for %q+D", decl
);
1353 else if (reg_number
< 0)
1354 error ("invalid register name for %q+D", decl
);
1355 else if (TYPE_MODE (TREE_TYPE (decl
)) == BLKmode
)
1356 error ("data type of %q+D isn%'t suitable for a register",
1358 else if (! HARD_REGNO_MODE_OK (reg_number
, TYPE_MODE (TREE_TYPE (decl
))))
1359 error ("register specified for %q+D isn%'t suitable for data type",
1361 /* Now handle properly declared static register variables. */
1366 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1368 DECL_INITIAL (decl
) = 0;
1369 error ("global register variable has initial value");
1371 if (TREE_THIS_VOLATILE (decl
))
1372 warning (OPT_Wvolatile_register_var
,
1373 "optimization may eliminate reads and/or "
1374 "writes to register variables");
1376 /* If the user specified one of the eliminables registers here,
1377 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1378 confused with that register and be eliminated. This usage is
1379 somewhat suspect... */
1381 SET_DECL_RTL (decl
, gen_rtx_raw_REG (DECL_MODE (decl
), reg_number
));
1382 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1383 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1385 if (TREE_STATIC (decl
))
1387 /* Make this register global, so not usable for anything
1389 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1390 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1391 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1393 nregs
= hard_regno_nregs
[reg_number
][DECL_MODE (decl
)];
1395 globalize_reg (reg_number
+ --nregs
);
1398 /* As a register variable, it has no section. */
1402 /* Now handle ordinary static variables and functions (in memory).
1403 Also handle vars declared register invalidly. */
1404 else if (name
[0] == '*')
1406 #ifdef REGISTER_PREFIX
1407 if (strlen (REGISTER_PREFIX
) != 0)
1409 reg_number
= decode_reg_name (name
);
1410 if (reg_number
>= 0 || reg_number
== -3)
1411 error ("register name given for non-register variable %q+D", decl
);
1416 /* Specifying a section attribute on a variable forces it into a
1417 non-.bss section, and thus it cannot be common. */
1418 if (TREE_CODE (decl
) == VAR_DECL
1419 && DECL_SECTION_NAME (decl
) != NULL_TREE
1420 && DECL_INITIAL (decl
) == NULL_TREE
1421 && DECL_COMMON (decl
))
1422 DECL_COMMON (decl
) = 0;
1424 /* Variables can't be both common and weak. */
1425 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1426 DECL_COMMON (decl
) = 0;
1428 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1429 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1431 x
= gen_rtx_SYMBOL_REF (Pmode
, name
);
1432 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1433 SET_SYMBOL_REF_DECL (x
, decl
);
1435 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1436 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1437 set_mem_attributes (x
, decl
, 1);
1438 SET_DECL_RTL (decl
, x
);
1440 /* Optionally set flags or add text to the name to record information
1441 such as that it is a function name.
1442 If the name is changed, the macro ASM_OUTPUT_LABELREF
1443 will have to know how to strip this information. */
1444 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1446 /* Make this function static known to the mudflap runtime. */
1447 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1448 mudflap_enqueue_decl (decl
);
1451 /* Output a string of literal assembler code
1452 for an `asm' keyword used between functions. */
1455 assemble_asm (tree string
)
1459 if (TREE_CODE (string
) == ADDR_EXPR
)
1460 string
= TREE_OPERAND (string
, 0);
1462 fprintf (asm_out_file
, "\t%s\n", TREE_STRING_POINTER (string
));
1465 /* Record an element in the table of global destructors. SYMBOL is
1466 a SYMBOL_REF of the function to be called; PRIORITY is a number
1467 between 0 and MAX_INIT_PRIORITY. */
1470 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED
,
1471 int priority ATTRIBUTE_UNUSED
)
1473 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1474 /* Tell GNU LD that this is part of the static destructor set.
1475 This will work for any system that uses stabs, most usefully
1477 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1478 dbxout_stab_value_label (XSTR (symbol
, 0));
1480 sorry ("global destructors not supported on this target");
1484 /* Write the address of the entity given by SYMBOL to SEC. */
1486 assemble_addr_to_section (rtx symbol
, section
*sec
)
1488 switch_to_section (sec
);
1489 assemble_align (POINTER_SIZE
);
1490 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1493 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1494 not) section for PRIORITY. */
1496 get_cdtor_priority_section (int priority
, bool constructor_p
)
1500 /* ??? This only works reliably with the GNU linker. */
1501 sprintf (buf
, "%s.%.5u",
1502 constructor_p
? ".ctors" : ".dtors",
1503 /* Invert the numbering so the linker puts us in the proper
1504 order; constructors are run from right to left, and the
1505 linker sorts in increasing order. */
1506 MAX_INIT_PRIORITY
- priority
);
1507 return get_section (buf
, SECTION_WRITE
, NULL
);
1511 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1515 if (priority
!= DEFAULT_INIT_PRIORITY
)
1516 sec
= get_cdtor_priority_section (priority
,
1517 /*constructor_p=*/false);
1519 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1521 assemble_addr_to_section (symbol
, sec
);
1524 #ifdef DTORS_SECTION_ASM_OP
1526 default_dtor_section_asm_out_destructor (rtx symbol
,
1527 int priority ATTRIBUTE_UNUSED
)
1529 assemble_addr_to_section (symbol
, dtors_section
);
1533 /* Likewise for global constructors. */
1536 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED
,
1537 int priority ATTRIBUTE_UNUSED
)
1539 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1540 /* Tell GNU LD that this is part of the static destructor set.
1541 This will work for any system that uses stabs, most usefully
1543 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1544 dbxout_stab_value_label (XSTR (symbol
, 0));
1546 sorry ("global constructors not supported on this target");
1551 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1555 if (priority
!= DEFAULT_INIT_PRIORITY
)
1556 sec
= get_cdtor_priority_section (priority
,
1557 /*constructor_p=*/true);
1559 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1561 assemble_addr_to_section (symbol
, sec
);
1564 #ifdef CTORS_SECTION_ASM_OP
1566 default_ctor_section_asm_out_constructor (rtx symbol
,
1567 int priority ATTRIBUTE_UNUSED
)
1569 assemble_addr_to_section (symbol
, ctors_section
);
1573 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1574 a nonzero value if the constant pool should be output before the
1575 start of the function, or a zero value if the pool should output
1576 after the end of the function. The default is to put it before the
1579 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1580 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1583 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1584 to be output to assembler.
1585 Set first_global_object_name and weak_global_object_name as appropriate. */
1588 notice_global_symbol (tree decl
)
1590 const char **type
= &first_global_object_name
;
1592 if (first_global_object_name
1593 || !TREE_PUBLIC (decl
)
1594 || DECL_EXTERNAL (decl
)
1595 || !DECL_NAME (decl
)
1596 || (TREE_CODE (decl
) != FUNCTION_DECL
1597 && (TREE_CODE (decl
) != VAR_DECL
1598 || (DECL_COMMON (decl
)
1599 && (DECL_INITIAL (decl
) == 0
1600 || DECL_INITIAL (decl
) == error_mark_node
))))
1601 || !MEM_P (DECL_RTL (decl
)))
1604 /* We win when global object is found, but it is useful to know about weak
1605 symbol as well so we can produce nicer unique names. */
1606 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1607 type
= &weak_global_object_name
;
1613 rtx decl_rtl
= DECL_RTL (decl
);
1615 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1616 name
= ggc_strdup (p
);
1622 /* Output assembler code for the constant pool of a function and associated
1623 with defining the name of the function. DECL describes the function.
1624 NAME is the function's name. For the constant pool, we use the current
1625 constant pool data. */
1628 assemble_start_function (tree decl
, const char *fnname
)
1631 char tmp_label
[100];
1632 bool hot_label_written
= false;
1634 crtl
->subsections
.unlikely_text_section_name
= NULL
;
1636 first_function_block_is_cold
= false;
1637 if (flag_reorder_blocks_and_partition
)
1639 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1640 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1641 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1642 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1643 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1644 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1645 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1646 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1651 crtl
->subsections
.hot_section_label
= NULL
;
1652 crtl
->subsections
.cold_section_label
= NULL
;
1653 crtl
->subsections
.hot_section_end_label
= NULL
;
1654 crtl
->subsections
.cold_section_end_label
= NULL
;
1657 /* The following code does not need preprocessing in the assembler. */
1661 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1662 output_constant_pool (fnname
, decl
);
1664 resolve_unique_section (decl
, 0, flag_function_sections
);
1666 /* Make sure the not and cold text (code) sections are properly
1667 aligned. This is necessary here in the case where the function
1668 has both hot and cold sections, because we don't want to re-set
1669 the alignment when the section switch happens mid-function. */
1671 if (flag_reorder_blocks_and_partition
)
1673 switch_to_section (unlikely_text_section ());
1674 assemble_align (DECL_ALIGN (decl
));
1675 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1677 /* When the function starts with a cold section, we need to explicitly
1678 align the hot section and write out the hot section label.
1679 But if the current function is a thunk, we do not have a CFG. */
1681 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1683 switch_to_section (text_section
);
1684 assemble_align (DECL_ALIGN (decl
));
1685 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1686 hot_label_written
= true;
1687 first_function_block_is_cold
= true;
1690 else if (DECL_SECTION_NAME (decl
))
1692 /* Calls to function_section rely on first_function_block_is_cold
1693 being accurate. The first block may be cold even if we aren't
1694 doing partitioning, if the entire function was decided by
1695 choose_function_section (predict.c) to be cold. */
1697 initialize_cold_section_name ();
1699 if (crtl
->subsections
.unlikely_text_section_name
1700 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl
)),
1701 crtl
->subsections
.unlikely_text_section_name
) == 0)
1702 first_function_block_is_cold
= true;
1705 in_cold_section_p
= first_function_block_is_cold
;
1707 /* Switch to the correct text section for the start of the function. */
1709 switch_to_section (function_section (decl
));
1710 if (flag_reorder_blocks_and_partition
1711 && !hot_label_written
)
1712 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1714 /* Tell assembler to move to target machine's alignment for functions. */
1715 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1718 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1721 /* Handle a user-specified function alignment.
1722 Note that we still need to align to DECL_ALIGN, as above,
1723 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1724 if (! DECL_USER_ALIGN (decl
)
1725 && align_functions_log
> align
1726 && optimize_function_for_speed_p (cfun
))
1728 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1729 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1730 align_functions_log
, align_functions
- 1);
1732 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1736 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1737 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1740 (*debug_hooks
->begin_function
) (decl
);
1742 /* Make function name accessible from other files, if appropriate. */
1744 if (TREE_PUBLIC (decl
))
1746 notice_global_symbol (decl
);
1748 globalize_decl (decl
);
1750 maybe_assemble_visibility (decl
);
1753 if (DECL_PRESERVE_P (decl
))
1754 targetm
.asm_out
.mark_decl_preserved (fnname
);
1756 /* Do any machine/system dependent processing of the function name. */
1757 #ifdef ASM_DECLARE_FUNCTION_NAME
1758 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1760 /* Standard thing is just output label for the function. */
1761 ASM_OUTPUT_LABEL (asm_out_file
, fnname
);
1762 #endif /* ASM_DECLARE_FUNCTION_NAME */
1765 /* Output assembler code associated with defining the size of the
1766 function. DECL describes the function. NAME is the function's name. */
1769 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1771 #ifdef ASM_DECLARE_FUNCTION_SIZE
1772 /* We could have switched section in the middle of the function. */
1773 if (flag_reorder_blocks_and_partition
)
1774 switch_to_section (function_section (decl
));
1775 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1777 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1779 output_constant_pool (fnname
, decl
);
1780 switch_to_section (function_section (decl
)); /* need to switch back */
1782 /* Output labels for end of hot/cold text sections (to be used by
1784 if (flag_reorder_blocks_and_partition
)
1786 section
*save_text_section
;
1788 save_text_section
= in_section
;
1789 switch_to_section (unlikely_text_section ());
1790 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1791 if (first_function_block_is_cold
)
1792 switch_to_section (text_section
);
1794 switch_to_section (function_section (decl
));
1795 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1796 switch_to_section (save_text_section
);
1800 /* Assemble code to leave SIZE bytes of zeros. */
1803 assemble_zeros (unsigned HOST_WIDE_INT size
)
1805 /* Do no output if -fsyntax-only. */
1806 if (flag_syntax_only
)
1809 #ifdef ASM_NO_SKIP_IN_TEXT
1810 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1811 so we must output 0s explicitly in the text section. */
1812 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1814 unsigned HOST_WIDE_INT i
;
1815 for (i
= 0; i
< size
; i
++)
1816 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1821 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1824 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1827 assemble_align (int align
)
1829 if (align
> BITS_PER_UNIT
)
1831 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1835 /* Assemble a string constant with the specified C string as contents. */
1838 assemble_string (const char *p
, int size
)
1843 /* If the string is very long, split it up. */
1847 int thissize
= size
- pos
;
1848 if (thissize
> maximum
)
1851 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1859 /* A noswitch_section_callback for lcomm_section. */
1862 emit_local (tree decl ATTRIBUTE_UNUSED
,
1863 const char *name ATTRIBUTE_UNUSED
,
1864 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1865 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1867 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1868 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1869 size
, DECL_ALIGN (decl
));
1871 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1872 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1875 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1880 /* A noswitch_section_callback for bss_noswitch_section. */
1882 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1884 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1885 const char *name ATTRIBUTE_UNUSED
,
1886 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1887 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1889 #if defined ASM_OUTPUT_ALIGNED_BSS
1890 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1893 ASM_OUTPUT_BSS (asm_out_file
, decl
, name
, size
, rounded
);
1899 /* A noswitch_section_callback for comm_section. */
1902 emit_common (tree decl ATTRIBUTE_UNUSED
,
1903 const char *name ATTRIBUTE_UNUSED
,
1904 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1905 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1907 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1908 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1909 size
, DECL_ALIGN (decl
));
1911 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1912 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1915 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1920 /* A noswitch_section_callback for tls_comm_section. */
1923 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1924 const char *name ATTRIBUTE_UNUSED
,
1925 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1926 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1928 #ifdef ASM_OUTPUT_TLS_COMMON
1929 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1932 sorry ("thread-local COMMON data not implemented");
1937 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1938 NAME is the name of DECL's SYMBOL_REF. */
1941 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1943 unsigned HOST_WIDE_INT size
, rounded
;
1945 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1948 /* Don't allocate zero bytes of common,
1949 since that means "undefined external" in the linker. */
1953 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1954 so that each uninitialized object starts on such a boundary. */
1955 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1956 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1957 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1959 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1960 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1961 warning (0, "requested alignment for %q+D is greater than "
1962 "implemented alignment of %wu", decl
, rounded
);
1965 /* A subroutine of assemble_variable. Output the label and contents of
1966 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1967 is as for assemble_variable. */
1970 assemble_variable_contents (tree decl
, const char *name
,
1971 bool dont_output_data
)
1973 /* Do any machine/system dependent processing of the object. */
1974 #ifdef ASM_DECLARE_OBJECT_NAME
1975 last_assemble_variable_decl
= decl
;
1976 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1978 /* Standard thing is just output label for the object. */
1979 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1980 #endif /* ASM_DECLARE_OBJECT_NAME */
1982 if (!dont_output_data
)
1984 if (DECL_INITIAL (decl
)
1985 && DECL_INITIAL (decl
) != error_mark_node
1986 && !initializer_zerop (DECL_INITIAL (decl
)))
1987 /* Output the actual data. */
1988 output_constant (DECL_INITIAL (decl
),
1989 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1992 /* Leave space for it. */
1993 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1997 /* Initialize emulated tls object TO, which refers to TLS variable
1998 DECL and is initialized by PROXY. */
2001 default_emutls_var_init (tree to
, tree decl
, tree proxy
)
2003 VEC(constructor_elt
,gc
) *v
= VEC_alloc (constructor_elt
, gc
, 4);
2004 constructor_elt
*elt
;
2005 tree type
= TREE_TYPE (to
);
2006 tree field
= TYPE_FIELDS (type
);
2008 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2010 elt
->value
= fold_convert (TREE_TYPE (field
), DECL_SIZE_UNIT (decl
));
2012 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2013 field
= TREE_CHAIN (field
);
2015 elt
->value
= build_int_cst (TREE_TYPE (field
),
2016 DECL_ALIGN_UNIT (decl
));
2018 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2019 field
= TREE_CHAIN (field
);
2021 elt
->value
= null_pointer_node
;
2023 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2024 field
= TREE_CHAIN (field
);
2028 return build_constructor (type
, v
);
2031 /* Assemble everything that is needed for a variable or function declaration.
2032 Not used for automatic variables, and not used for function definitions.
2033 Should not be called for variables of incomplete structure type.
2035 TOP_LEVEL is nonzero if this variable has file scope.
2036 AT_END is nonzero if this is the special handling, at end of compilation,
2037 to define things that have had only tentative definitions.
2038 DONT_OUTPUT_DATA if nonzero means don't actually output the
2039 initial value (that will be done by the caller). */
2042 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2043 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2046 rtx decl_rtl
, symbol
;
2049 if (! targetm
.have_tls
2050 && TREE_CODE (decl
) == VAR_DECL
2051 && DECL_THREAD_LOCAL_P (decl
))
2053 tree to
= emutls_decl (decl
);
2055 /* If this variable is defined locally, then we need to initialize the
2056 control structure with size and alignment information. We do this
2057 at the last moment because tentative definitions can take a locally
2058 defined but uninitialized variable and initialize it later, which
2059 would result in incorrect contents. */
2060 if (! DECL_EXTERNAL (to
)
2061 && (! DECL_COMMON (to
)
2062 || (DECL_INITIAL (decl
)
2063 && DECL_INITIAL (decl
) != error_mark_node
)))
2065 DECL_INITIAL (to
) = targetm
.emutls
.var_init
2066 (to
, decl
, get_emutls_init_templ_addr (decl
));
2068 /* Make sure the template is marked as needed early enough.
2069 Without this, if the variable is placed in a
2070 section-anchored block, the template will only be marked
2071 when it's too late. */
2072 record_references_in_initializer (to
);
2078 last_assemble_variable_decl
= 0;
2080 /* Normally no need to say anything here for external references,
2081 since assemble_external is called by the language-specific code
2082 when a declaration is first seen. */
2084 if (DECL_EXTERNAL (decl
))
2087 /* Output no assembler code for a function declaration.
2088 Only definitions of functions output anything. */
2090 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2093 /* Do nothing for global register variables. */
2094 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2096 TREE_ASM_WRITTEN (decl
) = 1;
2100 /* If type was incomplete when the variable was declared,
2101 see if it is complete now. */
2103 if (DECL_SIZE (decl
) == 0)
2104 layout_decl (decl
, 0);
2106 /* Still incomplete => don't allocate it; treat the tentative defn
2107 (which is what it must have been) as an `extern' reference. */
2109 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2111 error ("storage size of %q+D isn%'t known", decl
);
2112 TREE_ASM_WRITTEN (decl
) = 1;
2116 /* The first declaration of a variable that comes through this function
2117 decides whether it is global (in C, has external linkage)
2118 or local (in C, has internal linkage). So do nothing more
2119 if this function has already run. */
2121 if (TREE_ASM_WRITTEN (decl
))
2124 /* Make sure targetm.encode_section_info is invoked before we set
2126 decl_rtl
= DECL_RTL (decl
);
2128 TREE_ASM_WRITTEN (decl
) = 1;
2130 /* Do no output if -fsyntax-only. */
2131 if (flag_syntax_only
)
2136 if (! dont_output_data
2137 && ! host_integerp (DECL_SIZE_UNIT (decl
), 1))
2139 error ("size of variable %q+D is too large", decl
);
2143 gcc_assert (MEM_P (decl_rtl
));
2144 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2145 symbol
= XEXP (decl_rtl
, 0);
2146 name
= XSTR (symbol
, 0);
2147 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2148 notice_global_symbol (decl
);
2150 /* Compute the alignment of this data. */
2152 align_variable (decl
, dont_output_data
);
2153 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2155 if (TREE_PUBLIC (decl
))
2156 maybe_assemble_visibility (decl
);
2158 if (DECL_PRESERVE_P (decl
))
2159 targetm
.asm_out
.mark_decl_preserved (name
);
2161 /* First make the assembler name(s) global if appropriate. */
2162 sect
= get_variable_section (decl
, false);
2163 if (TREE_PUBLIC (decl
)
2165 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2166 globalize_decl (decl
);
2168 /* Output any data that we will need to use the address of. */
2169 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2170 output_addressed_constants (DECL_INITIAL (decl
));
2172 /* dbxout.c needs to know this. */
2173 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2174 DECL_IN_TEXT_SECTION (decl
) = 1;
2176 /* If the decl is part of an object_block, make sure that the decl
2177 has been positioned within its block, but do not write out its
2178 definition yet. output_object_blocks will do that later. */
2179 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2181 gcc_assert (!dont_output_data
);
2182 place_block_symbol (symbol
);
2184 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2185 assemble_noswitch_variable (decl
, name
, sect
);
2188 switch_to_section (sect
);
2189 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2190 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2191 assemble_variable_contents (decl
, name
, dont_output_data
);
2195 /* Return 1 if type TYPE contains any pointers. */
2198 contains_pointers_p (tree type
)
2200 switch (TREE_CODE (type
))
2203 case REFERENCE_TYPE
:
2204 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2205 so I'll play safe and return 1. */
2211 case QUAL_UNION_TYPE
:
2214 /* For a type that has fields, see if the fields have pointers. */
2215 for (fields
= TYPE_FIELDS (type
); fields
; fields
= TREE_CHAIN (fields
))
2216 if (TREE_CODE (fields
) == FIELD_DECL
2217 && contains_pointers_p (TREE_TYPE (fields
)))
2223 /* An array type contains pointers if its element type does. */
2224 return contains_pointers_p (TREE_TYPE (type
));
2231 /* We delay assemble_external processing until
2232 the compilation unit is finalized. This is the best we can do for
2233 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2234 it all the way to final. See PR 17982 for further discussion. */
2235 static GTY(()) tree pending_assemble_externals
;
2237 #ifdef ASM_OUTPUT_EXTERNAL
2238 /* True if DECL is a function decl for which no out-of-line copy exists.
2239 It is assumed that DECL's assembler name has been set. */
2242 incorporeal_function_p (tree decl
)
2244 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2248 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2249 && DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
)
2252 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2253 if (strncmp (name
, "__builtin_", strlen ("__builtin_")) == 0)
2259 /* Actually do the tests to determine if this is necessary, and invoke
2260 ASM_OUTPUT_EXTERNAL. */
2262 assemble_external_real (tree decl
)
2264 rtx rtl
= DECL_RTL (decl
);
2266 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2267 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2268 && !incorporeal_function_p (decl
))
2270 /* Some systems do require some output. */
2271 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2272 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2278 process_pending_assemble_externals (void)
2280 #ifdef ASM_OUTPUT_EXTERNAL
2282 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2283 assemble_external_real (TREE_VALUE (list
));
2285 pending_assemble_externals
= 0;
2289 /* This TREE_LIST contains any weak symbol declarations waiting
2291 static GTY(()) tree weak_decls
;
2293 /* Output something to declare an external symbol to the assembler.
2294 (Most assemblers don't need this, so we normally output nothing.)
2295 Do nothing if DECL is not external. */
2298 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2300 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2301 main body of this code is only rarely exercised. To provide some
2302 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2303 open. If it's not, we should not be calling this function. */
2304 gcc_assert (asm_out_file
);
2306 #ifdef ASM_OUTPUT_EXTERNAL
2307 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2310 if (SUPPORTS_WEAK
&& DECL_WEAK (decl
))
2311 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2313 /* We want to output external symbols at very last to check if they
2314 are references or not. */
2315 pending_assemble_externals
= tree_cons (0, decl
,
2316 pending_assemble_externals
);
2320 /* Similar, for calling a library function FUN. */
2323 assemble_external_libcall (rtx fun
)
2325 /* Declare library function name external when first used, if nec. */
2326 if (! SYMBOL_REF_USED (fun
))
2328 SYMBOL_REF_USED (fun
) = 1;
2329 targetm
.asm_out
.external_libcall (fun
);
2333 /* Assemble a label named NAME. */
2336 assemble_label (const char *name
)
2338 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2341 /* Set the symbol_referenced flag for ID. */
2343 mark_referenced (tree id
)
2345 TREE_SYMBOL_REFERENCED (id
) = 1;
2348 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2350 mark_decl_referenced (tree decl
)
2352 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2354 /* Extern inline functions don't become needed when referenced.
2355 If we know a method will be emitted in other TU and no new
2356 functions can be marked reachable, just use the external
2358 struct cgraph_node
*node
= cgraph_node (decl
);
2359 if (!DECL_EXTERNAL (decl
)
2360 && (!node
->local
.vtable_method
|| !cgraph_global_info_ready
2361 || !node
->local
.finalized
))
2362 cgraph_mark_needed_node (node
);
2364 else if (TREE_CODE (decl
) == VAR_DECL
)
2366 struct varpool_node
*node
= varpool_node (decl
);
2367 varpool_mark_needed_node (node
);
2368 /* C++ frontend use mark_decl_references to force COMDAT variables
2369 to be output that might appear dead otherwise. */
2370 node
->force_output
= true;
2372 /* else do nothing - we can get various sorts of CST nodes here,
2373 which do not need to be marked. */
2377 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2378 until we find an identifier that is not itself a transparent alias.
2379 Modify the alias passed to it by reference (and all aliases on the
2380 way to the ultimate target), such that they do not have to be
2381 followed again, and return the ultimate target of the alias
2385 ultimate_transparent_alias_target (tree
*alias
)
2387 tree target
= *alias
;
2389 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2391 gcc_assert (TREE_CHAIN (target
));
2392 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2393 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2394 && ! TREE_CHAIN (target
));
2401 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2402 starts with a *, the rest of NAME is output verbatim. Otherwise
2403 NAME is transformed in a target-specific way (usually by the
2404 addition of an underscore). */
2407 assemble_name_raw (FILE *file
, const char *name
)
2410 fputs (&name
[1], file
);
2412 ASM_OUTPUT_LABELREF (file
, name
);
2415 /* Like assemble_name_raw, but should be used when NAME might refer to
2416 an entity that is also represented as a tree (like a function or
2417 variable). If NAME does refer to such an entity, that entity will
2418 be marked as referenced. */
2421 assemble_name (FILE *file
, const char *name
)
2423 const char *real_name
;
2426 real_name
= targetm
.strip_name_encoding (name
);
2428 id
= maybe_get_identifier (real_name
);
2433 mark_referenced (id
);
2434 ultimate_transparent_alias_target (&id
);
2436 name
= IDENTIFIER_POINTER (id
);
2437 gcc_assert (! TREE_CHAIN (id
));
2440 assemble_name_raw (file
, name
);
2443 /* Allocate SIZE bytes writable static space with a gensym name
2444 and return an RTX to refer to its address. */
2447 assemble_static_space (unsigned HOST_WIDE_INT size
)
2450 const char *namestring
;
2453 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2455 namestring
= ggc_strdup (name
);
2457 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2458 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2460 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2461 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2464 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2465 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2468 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2469 so that each uninitialized object starts on such a boundary. */
2470 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2471 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2472 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2473 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2474 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2475 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2482 /* Assemble the static constant template for function entry trampolines.
2483 This is done at most once per compilation.
2484 Returns an RTX for the address of the template. */
2486 static GTY(()) rtx initial_trampoline
;
2488 #ifdef TRAMPOLINE_TEMPLATE
2490 assemble_trampoline_template (void)
2497 if (initial_trampoline
)
2498 return initial_trampoline
;
2500 /* By default, put trampoline templates in read-only data section. */
2502 #ifdef TRAMPOLINE_SECTION
2503 switch_to_section (TRAMPOLINE_SECTION
);
2505 switch_to_section (readonly_data_section
);
2508 /* Write the assembler code to define one. */
2509 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2512 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2515 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2516 TRAMPOLINE_TEMPLATE (asm_out_file
);
2518 /* Record the rtl to refer to it. */
2519 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2520 name
= ggc_strdup (label
);
2521 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2522 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2524 initial_trampoline
= gen_rtx_MEM (BLKmode
, symbol
);
2525 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2527 return initial_trampoline
;
2531 /* A and B are either alignments or offsets. Return the minimum alignment
2532 that may be assumed after adding the two together. */
2534 static inline unsigned
2535 min_align (unsigned int a
, unsigned int b
)
2537 return (a
| b
) & -(a
| b
);
2540 /* Return the assembler directive for creating a given kind of integer
2541 object. SIZE is the number of bytes in the object and ALIGNED_P
2542 indicates whether it is known to be aligned. Return NULL if the
2543 assembly dialect has no such directive.
2545 The returned string should be printed at the start of a new line and
2546 be followed immediately by the object's initial value. */
2549 integer_asm_op (int size
, int aligned_p
)
2551 struct asm_int_op
*ops
;
2554 ops
= &targetm
.asm_out
.aligned_op
;
2556 ops
= &targetm
.asm_out
.unaligned_op
;
2561 return targetm
.asm_out
.byte_op
;
2575 /* Use directive OP to assemble an integer object X. Print OP at the
2576 start of the line, followed immediately by the value of X. */
2579 assemble_integer_with_op (const char *op
, rtx x
)
2581 fputs (op
, asm_out_file
);
2582 output_addr_const (asm_out_file
, x
);
2583 fputc ('\n', asm_out_file
);
2586 /* The default implementation of the asm_out.integer target hook. */
2589 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2590 unsigned int size ATTRIBUTE_UNUSED
,
2591 int aligned_p ATTRIBUTE_UNUSED
)
2593 const char *op
= integer_asm_op (size
, aligned_p
);
2594 /* Avoid GAS bugs for large values. Specifically negative values whose
2595 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2596 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2598 return op
&& (assemble_integer_with_op (op
, x
), true);
2601 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2602 the alignment of the integer in bits. Return 1 if we were able to output
2603 the constant, otherwise 0. We must be able to output the constant,
2604 if FORCE is nonzero. */
2607 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2611 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2613 /* See if the target hook can handle this kind of object. */
2614 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2617 /* If the object is a multi-byte one, try splitting it up. Split
2618 it into words it if is multi-word, otherwise split it into bytes. */
2621 enum machine_mode omode
, imode
;
2622 unsigned int subalign
;
2623 unsigned int subsize
, i
;
2624 unsigned char mclass
;
2626 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2627 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2628 if (GET_CODE (x
) == CONST_FIXED
)
2629 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2633 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2634 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2636 for (i
= 0; i
< size
; i
+= subsize
)
2638 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2639 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2645 /* If we've printed some of it, but not all of it, there's no going
2650 gcc_assert (!force
);
2656 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2658 long data
[4] = {0, 0, 0, 0};
2660 int bitsize
, nelts
, nunits
, units_per
;
2662 /* This is hairy. We have a quantity of known size. real_to_target
2663 will put it into an array of *host* longs, 32 bits per element
2664 (even if long is more than 32 bits). We need to determine the
2665 number of array elements that are occupied (nelts) and the number
2666 of *target* min-addressable units that will be occupied in the
2667 object file (nunits). We cannot assume that 32 divides the
2668 mode's bitsize (size * BITS_PER_UNIT) evenly.
2670 size * BITS_PER_UNIT is used here to make sure that padding bits
2671 (which might appear at either end of the value; real_to_target
2672 will include the padding bits in its output array) are included. */
2674 nunits
= GET_MODE_SIZE (mode
);
2675 bitsize
= nunits
* BITS_PER_UNIT
;
2676 nelts
= CEIL (bitsize
, 32);
2677 units_per
= 32 / BITS_PER_UNIT
;
2679 real_to_target (data
, &d
, mode
);
2681 /* Put out the first word with the specified alignment. */
2682 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2683 nunits
-= units_per
;
2685 /* Subsequent words need only 32-bit alignment. */
2686 align
= min_align (align
, 32);
2688 for (i
= 1; i
< nelts
; i
++)
2690 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2691 nunits
-= units_per
;
2695 /* Given an expression EXP with a constant value,
2696 reduce it to the sum of an assembler symbol and an integer.
2697 Store them both in the structure *VALUE.
2698 EXP must be reducible. */
2700 struct addr_const
GTY(())
2703 HOST_WIDE_INT offset
;
2707 decode_addr_const (tree exp
, struct addr_const
*value
)
2709 tree target
= TREE_OPERAND (exp
, 0);
2715 if (TREE_CODE (target
) == COMPONENT_REF
2716 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2719 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2720 target
= TREE_OPERAND (target
, 0);
2722 else if (TREE_CODE (target
) == ARRAY_REF
2723 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2725 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2726 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2727 target
= TREE_OPERAND (target
, 0);
2733 switch (TREE_CODE (target
))
2737 x
= DECL_RTL (target
);
2741 x
= gen_rtx_MEM (FUNCTION_MODE
,
2742 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2751 x
= output_constant_def (target
, 1);
2758 gcc_assert (MEM_P (x
));
2762 value
->offset
= offset
;
2765 /* Uniquize all constants that appear in memory.
2766 Each constant in memory thus far output is recorded
2767 in `const_desc_table'. */
2769 struct constant_descriptor_tree
GTY(())
2771 /* A MEM for the constant. */
2774 /* The value of the constant. */
2777 /* Hash of value. Computing the hash from value each time
2778 hashfn is called can't work properly, as that means recursive
2779 use of the hash table during hash table expansion. */
2783 static GTY((param_is (struct constant_descriptor_tree
)))
2784 htab_t const_desc_htab
;
2786 static struct constant_descriptor_tree
* build_constant_desc (tree
);
2787 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2789 /* Compute a hash code for a constant expression. */
2792 const_desc_hash (const void *ptr
)
2794 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2798 const_hash_1 (const tree exp
)
2803 enum tree_code code
= TREE_CODE (exp
);
2805 /* Either set P and LEN to the address and len of something to hash and
2806 exit the switch or return a value. */
2811 p
= (char *) &TREE_INT_CST (exp
);
2812 len
= sizeof TREE_INT_CST (exp
);
2816 return real_hash (TREE_REAL_CST_PTR (exp
));
2819 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2822 p
= TREE_STRING_POINTER (exp
);
2823 len
= TREE_STRING_LENGTH (exp
);
2827 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2828 + const_hash_1 (TREE_IMAGPART (exp
)));
2832 unsigned HOST_WIDE_INT idx
;
2835 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2837 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2839 hi
= hi
* 603 + const_hash_1 (value
);
2847 struct addr_const value
;
2849 decode_addr_const (exp
, &value
);
2850 switch (GET_CODE (value
.base
))
2853 /* Don't hash the address of the SYMBOL_REF;
2854 only use the offset and the symbol name. */
2856 p
= XSTR (value
.base
, 0);
2857 for (i
= 0; p
[i
] != 0; i
++)
2858 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2862 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2872 case POINTER_PLUS_EXPR
:
2874 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2875 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2878 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2881 /* A language specific constant. Just hash the code. */
2885 /* Compute hashing function. */
2887 for (i
= 0; i
< len
; i
++)
2888 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2893 /* Wrapper of compare_constant, for the htab interface. */
2895 const_desc_eq (const void *p1
, const void *p2
)
2897 const struct constant_descriptor_tree
*const c1
2898 = (const struct constant_descriptor_tree
*) p1
;
2899 const struct constant_descriptor_tree
*const c2
2900 = (const struct constant_descriptor_tree
*) p2
;
2901 if (c1
->hash
!= c2
->hash
)
2903 return compare_constant (c1
->value
, c2
->value
);
2906 /* Compare t1 and t2, and return 1 only if they are known to result in
2907 the same bit pattern on output. */
2910 compare_constant (const tree t1
, const tree t2
)
2912 enum tree_code typecode
;
2914 if (t1
== NULL_TREE
)
2915 return t2
== NULL_TREE
;
2916 if (t2
== NULL_TREE
)
2919 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2922 switch (TREE_CODE (t1
))
2925 /* Integer constants are the same only if the same width of type. */
2926 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2928 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2930 return tree_int_cst_equal (t1
, t2
);
2933 /* Real constants are the same only if the same width of type. */
2934 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2937 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2940 /* Fixed constants are the same only if the same width of type. */
2941 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2944 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2947 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2950 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2951 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2952 TREE_STRING_LENGTH (t1
)));
2955 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2956 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2960 VEC(constructor_elt
, gc
) *v1
, *v2
;
2961 unsigned HOST_WIDE_INT idx
;
2963 typecode
= TREE_CODE (TREE_TYPE (t1
));
2964 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2967 if (typecode
== ARRAY_TYPE
)
2969 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2970 /* For arrays, check that the sizes all match. */
2971 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2973 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2978 /* For record and union constructors, require exact type
2980 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2984 v1
= CONSTRUCTOR_ELTS (t1
);
2985 v2
= CONSTRUCTOR_ELTS (t2
);
2986 if (VEC_length (constructor_elt
, v1
)
2987 != VEC_length (constructor_elt
, v2
))
2990 for (idx
= 0; idx
< VEC_length (constructor_elt
, v1
); ++idx
)
2992 constructor_elt
*c1
= VEC_index (constructor_elt
, v1
, idx
);
2993 constructor_elt
*c2
= VEC_index (constructor_elt
, v2
, idx
);
2995 /* Check that each value is the same... */
2996 if (!compare_constant (c1
->value
, c2
->value
))
2998 /* ... and that they apply to the same fields! */
2999 if (typecode
== ARRAY_TYPE
)
3001 if (!compare_constant (c1
->index
, c2
->index
))
3006 if (c1
->index
!= c2
->index
)
3017 struct addr_const value1
, value2
;
3019 decode_addr_const (t1
, &value1
);
3020 decode_addr_const (t2
, &value2
);
3021 return (value1
.offset
== value2
.offset
3022 && strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3026 case POINTER_PLUS_EXPR
:
3029 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3030 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3033 case VIEW_CONVERT_EXPR
:
3034 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3043 /* Make a copy of the whole tree structure for a constant. This
3044 handles the same types of nodes that compare_constant handles. */
3047 copy_constant (tree exp
)
3049 switch (TREE_CODE (exp
))
3052 /* For ADDR_EXPR, we do not want to copy the decl whose address
3053 is requested. We do want to copy constants though. */
3054 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
3055 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3056 copy_constant (TREE_OPERAND (exp
, 0)));
3058 return copy_node (exp
);
3064 return copy_node (exp
);
3067 return build_complex (TREE_TYPE (exp
),
3068 copy_constant (TREE_REALPART (exp
)),
3069 copy_constant (TREE_IMAGPART (exp
)));
3072 case POINTER_PLUS_EXPR
:
3074 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3075 copy_constant (TREE_OPERAND (exp
, 0)),
3076 copy_constant (TREE_OPERAND (exp
, 1)));
3079 case VIEW_CONVERT_EXPR
:
3080 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3081 copy_constant (TREE_OPERAND (exp
, 0)));
3085 tree copy
= copy_node (exp
);
3086 VEC(constructor_elt
, gc
) *v
;
3087 unsigned HOST_WIDE_INT idx
;
3088 tree purpose
, value
;
3090 v
= VEC_alloc(constructor_elt
, gc
, VEC_length(constructor_elt
,
3091 CONSTRUCTOR_ELTS (exp
)));
3092 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3094 constructor_elt
*ce
= VEC_quick_push (constructor_elt
, v
, NULL
);
3095 ce
->index
= purpose
;
3096 ce
->value
= copy_constant (value
);
3098 CONSTRUCTOR_ELTS (copy
) = v
;
3107 /* Return the alignment of constant EXP in bits. */
3110 get_constant_alignment (tree exp
)
3114 align
= TYPE_ALIGN (TREE_TYPE (exp
));
3115 #ifdef CONSTANT_ALIGNMENT
3116 align
= CONSTANT_ALIGNMENT (exp
, align
);
3121 /* Return the section into which constant EXP should be placed. */
3124 get_constant_section (tree exp
)
3126 if (IN_NAMED_SECTION (exp
))
3127 return get_named_section (exp
, NULL
, compute_reloc_for_constant (exp
));
3129 return targetm
.asm_out
.select_section (exp
,
3130 compute_reloc_for_constant (exp
),
3131 get_constant_alignment (exp
));
3134 /* Return the size of constant EXP in bytes. */
3136 static HOST_WIDE_INT
3137 get_constant_size (tree exp
)
3141 size
= int_size_in_bytes (TREE_TYPE (exp
));
3142 if (TREE_CODE (exp
) == STRING_CST
)
3143 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3147 /* Subroutine of output_constant_def:
3148 No constant equal to EXP is known to have been output.
3149 Make a constant descriptor to enter EXP in the hash table.
3150 Assign the label number and construct RTL to refer to the
3151 constant's location in memory.
3152 Caller is responsible for updating the hash table. */
3154 static struct constant_descriptor_tree
*
3155 build_constant_desc (tree exp
)
3161 struct constant_descriptor_tree
*desc
;
3163 desc
= GGC_NEW (struct constant_descriptor_tree
);
3164 desc
->value
= copy_constant (exp
);
3166 /* Propagate marked-ness to copied constant. */
3167 if (flag_mudflap
&& mf_marked_p (exp
))
3168 mf_mark (desc
->value
);
3170 /* Create a string containing the label name, in LABEL. */
3171 labelno
= const_labelno
++;
3172 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3174 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3175 if (use_object_blocks_p ())
3177 section
*sect
= get_constant_section (exp
);
3178 symbol
= create_block_symbol (ggc_strdup (label
),
3179 get_block_for_section (sect
), -1);
3182 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3183 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3184 SET_SYMBOL_REF_DECL (symbol
, desc
->value
);
3185 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3187 rtl
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3188 set_mem_attributes (rtl
, exp
, 1);
3189 set_mem_alias_set (rtl
, 0);
3190 set_mem_alias_set (rtl
, const_alias_set
);
3192 /* Set flags or add text to the name to record information, such as
3193 that it is a local symbol. If the name is changed, the macro
3194 ASM_OUTPUT_LABELREF will have to know how to strip this
3195 information. This call might invalidate our local variable
3196 SYMBOL; we can't use it afterward. */
3198 targetm
.encode_section_info (exp
, rtl
, true);
3205 /* Return an rtx representing a reference to constant data in memory
3206 for the constant expression EXP.
3208 If assembler code for such a constant has already been output,
3209 return an rtx to refer to it.
3210 Otherwise, output such a constant in memory
3211 and generate an rtx for it.
3213 If DEFER is nonzero, this constant can be deferred and output only
3214 if referenced in the function after all optimizations.
3216 `const_desc_table' records which constants already have label strings. */
3219 output_constant_def (tree exp
, int defer
)
3221 struct constant_descriptor_tree
*desc
;
3222 struct constant_descriptor_tree key
;
3225 /* Look up EXP in the table of constant descriptors. If we didn't find
3226 it, create a new one. */
3228 key
.hash
= const_hash_1 (exp
);
3229 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3231 desc
= (struct constant_descriptor_tree
*) *loc
;
3234 desc
= build_constant_desc (exp
);
3235 desc
->hash
= key
.hash
;
3239 maybe_output_constant_def_contents (desc
, defer
);
3243 /* Subroutine of output_constant_def: Decide whether or not we need to
3244 output the constant DESC now, and if so, do it. */
3246 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3249 rtx symbol
= XEXP (desc
->rtl
, 0);
3250 tree exp
= desc
->value
;
3252 if (flag_syntax_only
)
3255 if (TREE_ASM_WRITTEN (exp
))
3256 /* Already output; don't do it again. */
3259 /* We can always defer constants as long as the context allows
3263 /* Increment n_deferred_constants if it exists. It needs to be at
3264 least as large as the number of constants actually referred to
3265 by the function. If it's too small we'll stop looking too early
3266 and fail to emit constants; if it's too large we'll only look
3267 through the entire function when we could have stopped earlier. */
3269 n_deferred_constants
++;
3273 output_constant_def_contents (symbol
);
3276 /* Subroutine of output_constant_def_contents. Output the definition
3277 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3278 constant's alignment in bits. */
3281 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3285 size
= get_constant_size (exp
);
3287 /* Do any machine/system dependent processing of the constant. */
3288 #ifdef ASM_DECLARE_CONSTANT_NAME
3289 ASM_DECLARE_CONSTANT_NAME (asm_out_file
, label
, exp
, size
);
3291 /* Standard thing is just output label for the constant. */
3292 ASM_OUTPUT_LABEL (asm_out_file
, label
);
3293 #endif /* ASM_DECLARE_CONSTANT_NAME */
3295 /* Output the value of EXP. */
3296 output_constant (exp
, size
, align
);
3299 /* We must output the constant data referred to by SYMBOL; do so. */
3302 output_constant_def_contents (rtx symbol
)
3304 tree exp
= SYMBOL_REF_DECL (symbol
);
3307 /* Make sure any other constants whose addresses appear in EXP
3308 are assigned label numbers. */
3309 output_addressed_constants (exp
);
3311 /* We are no longer deferring this constant. */
3312 TREE_ASM_WRITTEN (exp
) = 1;
3314 /* If the constant is part of an object block, make sure that the
3315 decl has been positioned within its block, but do not write out
3316 its definition yet. output_object_blocks will do that later. */
3317 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3318 place_block_symbol (symbol
);
3321 switch_to_section (get_constant_section (exp
));
3322 align
= get_constant_alignment (exp
);
3323 if (align
> BITS_PER_UNIT
)
3324 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3325 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3328 mudflap_enqueue_constant (exp
);
3331 /* Look up EXP in the table of constant descriptors. Return the rtl
3332 if it has been emitted, else null. */
3335 lookup_constant_def (tree exp
)
3337 struct constant_descriptor_tree
*desc
;
3338 struct constant_descriptor_tree key
;
3341 key
.hash
= const_hash_1 (exp
);
3342 desc
= (struct constant_descriptor_tree
*)
3343 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3345 return (desc
? desc
->rtl
: NULL_RTX
);
3348 /* Used in the hash tables to avoid outputting the same constant
3349 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3350 are output once per function, not once per file. */
3351 /* ??? Only a few targets need per-function constant pools. Most
3352 can use one per-file pool. Should add a targetm bit to tell the
3355 struct rtx_constant_pool
GTY(())
3357 /* Pointers to first and last constant in pool, as ordered by offset. */
3358 struct constant_descriptor_rtx
*first
;
3359 struct constant_descriptor_rtx
*last
;
3361 /* Hash facility for making memory-constants from constant rtl-expressions.
3362 It is used on RISC machines where immediate integer arguments and
3363 constant addresses are restricted so that such constants must be stored
3365 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3367 /* Current offset in constant pool (does not include any
3368 machine-specific header). */
3369 HOST_WIDE_INT offset
;
3372 struct constant_descriptor_rtx
GTY((chain_next ("%h.next")))
3374 struct constant_descriptor_rtx
*next
;
3378 HOST_WIDE_INT offset
;
3380 enum machine_mode mode
;
3386 /* Hash and compare functions for const_rtx_htab. */
3389 const_desc_rtx_hash (const void *ptr
)
3391 const struct constant_descriptor_rtx
*const desc
3392 = (const struct constant_descriptor_rtx
*) ptr
;
3397 const_desc_rtx_eq (const void *a
, const void *b
)
3399 const struct constant_descriptor_rtx
*const x
3400 = (const struct constant_descriptor_rtx
*) a
;
3401 const struct constant_descriptor_rtx
*const y
3402 = (const struct constant_descriptor_rtx
*) b
;
3404 if (x
->mode
!= y
->mode
)
3406 return rtx_equal_p (x
->constant
, y
->constant
);
3409 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3412 const_rtx_hash_1 (rtx
*xp
, void *data
)
3414 unsigned HOST_WIDE_INT hwi
;
3415 enum machine_mode mode
;
3421 code
= GET_CODE (x
);
3422 mode
= GET_MODE (x
);
3423 h
= (hashval_t
) code
* 1048573 + mode
;
3431 const int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3432 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3435 h
^= (hashval_t
) hwi
;
3436 for (i
= 1; i
< n
; ++i
)
3439 h
^= (hashval_t
) hwi
;
3445 if (mode
== VOIDmode
)
3447 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3451 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3455 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3461 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3462 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3467 h
^= htab_hash_string (XSTR (x
, 0));
3471 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3475 case UNSPEC_VOLATILE
:
3476 h
= h
* 251 + XINT (x
, 1);
3483 hp
= (hashval_t
*) data
;
3484 *hp
= *hp
* 509 + h
;
3488 /* Compute a hash value for X, which should be a constant. */
3491 const_rtx_hash (rtx x
)
3494 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3499 /* Create and return a new rtx constant pool. */
3501 static struct rtx_constant_pool
*
3502 create_constant_pool (void)
3504 struct rtx_constant_pool
*pool
;
3506 pool
= GGC_NEW (struct rtx_constant_pool
);
3507 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3508 const_desc_rtx_eq
, NULL
);
3515 /* Initialize constant pool hashing for a new function. */
3518 init_varasm_status (void)
3520 crtl
->varasm
.pool
= create_constant_pool ();
3521 crtl
->varasm
.deferred_constants
= 0;
3524 /* Given a MINUS expression, simplify it if both sides
3525 include the same symbol. */
3528 simplify_subtraction (rtx x
)
3530 rtx r
= simplify_rtx (x
);
3534 /* Given a constant rtx X, make (or find) a memory constant for its value
3535 and return a MEM rtx to refer to it in memory. */
3538 force_const_mem (enum machine_mode mode
, rtx x
)
3540 struct constant_descriptor_rtx
*desc
, tmp
;
3541 struct rtx_constant_pool
*pool
;
3548 /* If we're not allowed to drop X into the constant pool, don't. */
3549 if (targetm
.cannot_force_const_mem (x
))
3552 /* Record that this function has used a constant pool entry. */
3553 crtl
->uses_const_pool
= 1;
3555 /* Decide which pool to use. */
3556 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3557 ? shared_constant_pool
3558 : crtl
->varasm
.pool
);
3560 /* Lookup the value in the hashtable. */
3563 hash
= const_rtx_hash (x
);
3564 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3565 desc
= (struct constant_descriptor_rtx
*) *slot
;
3567 /* If the constant was already present, return its memory. */
3569 return copy_rtx (desc
->mem
);
3571 /* Otherwise, create a new descriptor. */
3572 desc
= GGC_NEW (struct constant_descriptor_rtx
);
3575 /* Align the location counter as required by EXP's data type. */
3576 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3577 #ifdef CONSTANT_ALIGNMENT
3579 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3580 if (type
!= NULL_TREE
)
3581 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3585 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3586 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3589 desc
->constant
= tmp
.constant
;
3590 desc
->offset
= pool
->offset
;
3593 desc
->align
= align
;
3594 desc
->labelno
= const_labelno
;
3597 pool
->offset
+= GET_MODE_SIZE (mode
);
3599 pool
->last
->next
= desc
;
3601 pool
->first
= pool
->last
= desc
;
3604 /* Create a string containing the label name, in LABEL. */
3605 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3608 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3609 the constants pool. */
3610 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3612 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3613 symbol
= create_block_symbol (ggc_strdup (label
),
3614 get_block_for_section (sect
), -1);
3617 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3619 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3620 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3621 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3623 /* Construct the MEM. */
3624 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3625 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3626 set_mem_align (def
, align
);
3628 /* If we're dropping a label to the constant pool, make sure we
3630 if (GET_CODE (x
) == LABEL_REF
)
3631 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3633 return copy_rtx (def
);
3636 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3639 get_pool_constant (rtx addr
)
3641 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3644 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3645 and whether it has been output or not. */
3648 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3650 struct constant_descriptor_rtx
*desc
;
3652 desc
= SYMBOL_REF_CONSTANT (addr
);
3653 *pmarked
= (desc
->mark
!= 0);
3654 return desc
->constant
;
3657 /* Similar, return the mode. */
3660 get_pool_mode (const_rtx addr
)
3662 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3665 /* Return the size of the constant pool. */
3668 get_pool_size (void)
3670 return crtl
->varasm
.pool
->offset
;
3673 /* Worker function for output_constant_pool_1. Emit assembly for X
3674 in MODE with known alignment ALIGN. */
3677 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3679 switch (GET_MODE_CLASS (mode
))
3682 case MODE_DECIMAL_FLOAT
:
3686 gcc_assert (GET_CODE (x
) == CONST_DOUBLE
);
3687 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3688 assemble_real (r
, mode
, align
);
3693 case MODE_PARTIAL_INT
:
3698 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3701 case MODE_VECTOR_FLOAT
:
3702 case MODE_VECTOR_INT
:
3703 case MODE_VECTOR_FRACT
:
3704 case MODE_VECTOR_UFRACT
:
3705 case MODE_VECTOR_ACCUM
:
3706 case MODE_VECTOR_UACCUM
:
3709 enum machine_mode submode
= GET_MODE_INNER (mode
);
3710 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3712 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3713 units
= CONST_VECTOR_NUNITS (x
);
3715 for (i
= 0; i
< units
; i
++)
3717 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3718 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3728 /* Worker function for output_constant_pool. Emit constant DESC,
3729 giving it ALIGN bits of alignment. */
3732 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3739 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3740 whose CODE_LABEL has been deleted. This can occur if a jump table
3741 is eliminated by optimization. If so, write a constant of zero
3742 instead. Note that this can also happen by turning the
3743 CODE_LABEL into a NOTE. */
3744 /* ??? This seems completely and utterly wrong. Certainly it's
3745 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3746 functioning even with INSN_DELETED_P and friends. */
3749 switch (GET_CODE (tmp
))
3752 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3753 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3755 tmp
= XEXP (XEXP (tmp
, 0), 0);
3759 tmp
= XEXP (tmp
, 0);
3760 gcc_assert (!INSN_DELETED_P (tmp
));
3761 gcc_assert (!NOTE_P (tmp
)
3762 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3769 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3770 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3771 align
, desc
->labelno
, done
);
3774 assemble_align (align
);
3776 /* Output the label. */
3777 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3779 /* Output the data. */
3780 output_constant_pool_2 (desc
->mode
, x
, align
);
3782 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3783 sections have proper size. */
3784 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3786 && (in_section
->common
.flags
& SECTION_MERGE
))
3787 assemble_align (align
);
3789 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3795 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3796 to as used. Emit referenced deferred strings. This function can
3797 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3800 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3802 rtx x
= *current_rtx
;
3804 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3807 if (CONSTANT_POOL_ADDRESS_P (x
))
3809 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3810 if (desc
->mark
== 0)
3813 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3816 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3818 tree exp
= SYMBOL_REF_DECL (x
);
3819 if (!TREE_ASM_WRITTEN (exp
))
3821 n_deferred_constants
--;
3822 output_constant_def_contents (x
);
3829 /* Look through appropriate parts of INSN, marking all entries in the
3830 constant pool which are actually being used. Entries that are only
3831 referenced by other constants are also marked as used. Emit
3832 deferred strings that are used. */
3835 mark_constants (rtx insn
)
3840 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3841 insns, not any notes that may be attached. We don't want to mark
3842 a constant just because it happens to appear in a REG_EQUIV note. */
3843 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3845 rtx seq
= PATTERN (insn
);
3846 int i
, n
= XVECLEN (seq
, 0);
3847 for (i
= 0; i
< n
; ++i
)
3849 rtx subinsn
= XVECEXP (seq
, 0, i
);
3850 if (INSN_P (subinsn
))
3851 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3855 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3858 /* Look through the instructions for this function, and mark all the
3859 entries in POOL which are actually being used. Emit deferred constants
3860 which have indeed been used. */
3863 mark_constant_pool (void)
3867 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3870 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3871 mark_constants (insn
);
3873 for (link
= crtl
->epilogue_delay_list
;
3875 link
= XEXP (link
, 1))
3876 mark_constants (XEXP (link
, 0));
3879 /* Write all the constants in POOL. */
3882 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3884 struct constant_descriptor_rtx
*desc
;
3886 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3889 /* If the constant is part of an object_block, make sure that
3890 the constant has been positioned within its block, but do not
3891 write out its definition yet. output_object_blocks will do
3893 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3894 && SYMBOL_REF_BLOCK (desc
->sym
))
3895 place_block_symbol (desc
->sym
);
3898 switch_to_section (targetm
.asm_out
.select_rtx_section
3899 (desc
->mode
, desc
->constant
, desc
->align
));
3900 output_constant_pool_1 (desc
, desc
->align
);
3905 /* Mark all constants that are used in the current function, then write
3906 out the function's private constant pool. */
3909 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3910 tree fndecl ATTRIBUTE_UNUSED
)
3912 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3914 /* It is possible for gcc to call force_const_mem and then to later
3915 discard the instructions which refer to the constant. In such a
3916 case we do not need to output the constant. */
3917 mark_constant_pool ();
3919 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3920 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3923 output_constant_pool_contents (pool
);
3925 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3926 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3930 /* Write the contents of the shared constant pool. */
3933 output_shared_constant_pool (void)
3935 output_constant_pool_contents (shared_constant_pool
);
3938 /* Determine what kind of relocations EXP may need. */
3941 compute_reloc_for_constant (tree exp
)
3943 int reloc
= 0, reloc2
;
3946 switch (TREE_CODE (exp
))
3950 /* Go inside any operations that get_inner_reference can handle and see
3951 if what's inside is a constant: no need to do anything here for
3952 addresses of variables or functions. */
3953 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3954 tem
= TREE_OPERAND (tem
, 0))
3957 if (TREE_PUBLIC (tem
))
3964 case POINTER_PLUS_EXPR
:
3965 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3966 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3970 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3971 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3972 /* The difference of two local labels is computable at link time. */
3973 if (reloc
== 1 && reloc2
== 1)
3980 case VIEW_CONVERT_EXPR
:
3981 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3986 unsigned HOST_WIDE_INT idx
;
3987 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3989 reloc
|= compute_reloc_for_constant (tem
);
3999 /* Find all the constants whose addresses are referenced inside of EXP,
4000 and make sure assembler code with a label has been output for each one.
4001 Indicate whether an ADDR_EXPR has been encountered. */
4004 output_addressed_constants (tree exp
)
4008 switch (TREE_CODE (exp
))
4012 /* Go inside any operations that get_inner_reference can handle and see
4013 if what's inside is a constant: no need to do anything here for
4014 addresses of variables or functions. */
4015 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4016 tem
= TREE_OPERAND (tem
, 0))
4019 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4020 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4021 tem
= DECL_INITIAL (tem
);
4023 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4024 output_constant_def (tem
, 0);
4028 case POINTER_PLUS_EXPR
:
4030 output_addressed_constants (TREE_OPERAND (exp
, 1));
4034 case VIEW_CONVERT_EXPR
:
4035 output_addressed_constants (TREE_OPERAND (exp
, 0));
4040 unsigned HOST_WIDE_INT idx
;
4041 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4043 output_addressed_constants (tem
);
4052 /* Whether a constructor CTOR is a valid static constant initializer if all
4053 its elements are. This used to be internal to initializer_constant_valid_p
4054 and has been exposed to let other functions like categorize_ctor_elements
4055 evaluate the property while walking a constructor for other purposes. */
4058 constructor_static_from_elts_p (const_tree ctor
)
4060 return (TREE_CONSTANT (ctor
)
4061 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4062 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
)
4063 && !VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (ctor
)));
4066 /* A subroutine of initializer_constant_valid_p. VALUE is either a
4067 MINUS_EXPR or a POINTER_PLUS_EXPR, and ENDTYPE is a narrowing
4068 conversion to something smaller than a pointer. This returns
4069 null_pointer_node if the resulting value is an absolute constant
4070 which can be used to initialize a static variable. Otherwise it
4074 narrowing_initializer_constant_valid_p (tree value
, tree endtype
)
4078 op0
= TREE_OPERAND (value
, 0);
4079 op1
= TREE_OPERAND (value
, 1);
4081 /* Like STRIP_NOPS except allow the operand mode to widen. This
4082 works around a feature of fold that simplifies (int)(p1 - p2) to
4083 ((int)p1 - (int)p2) under the theory that the narrower operation
4086 while (CONVERT_EXPR_P (op0
)
4087 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4089 tree inner
= TREE_OPERAND (op0
, 0);
4090 if (inner
== error_mark_node
4091 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4092 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4093 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4098 while (CONVERT_EXPR_P (op1
)
4099 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4101 tree inner
= TREE_OPERAND (op1
, 0);
4102 if (inner
== error_mark_node
4103 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4104 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4105 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4110 op0
= initializer_constant_valid_p (op0
, endtype
);
4111 op1
= initializer_constant_valid_p (op1
, endtype
);
4113 /* Both initializers must be known. */
4117 return null_pointer_node
;
4119 /* Support differences between labels. */
4120 if (TREE_CODE (op0
) == LABEL_DECL
4121 && TREE_CODE (op1
) == LABEL_DECL
)
4122 return null_pointer_node
;
4124 if (TREE_CODE (op0
) == STRING_CST
4125 && TREE_CODE (op1
) == STRING_CST
4126 && operand_equal_p (op0
, op1
, 1))
4127 return null_pointer_node
;
4133 /* Return nonzero if VALUE is a valid constant-valued expression
4134 for use in initializing a static variable; one that can be an
4135 element of a "constant" initializer.
4137 Return null_pointer_node if the value is absolute;
4138 if it is relocatable, return the variable that determines the relocation.
4139 We assume that VALUE has been folded as much as possible;
4140 therefore, we do not need to check for such things as
4141 arithmetic-combinations of integers. */
4144 initializer_constant_valid_p (tree value
, tree endtype
)
4148 switch (TREE_CODE (value
))
4151 if (constructor_static_from_elts_p (value
))
4153 unsigned HOST_WIDE_INT idx
;
4155 bool absolute
= true;
4157 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4160 reloc
= initializer_constant_valid_p (elt
, TREE_TYPE (elt
));
4163 if (reloc
!= null_pointer_node
)
4166 /* For a non-absolute relocation, there is no single
4167 variable that can be "the variable that determines the
4169 return absolute
? null_pointer_node
: error_mark_node
;
4172 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4180 return null_pointer_node
;
4185 tree op0
= staticp (TREE_OPERAND (value
, 0));
4188 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4189 to be a constant, this is old-skool offsetof-like nonsense. */
4190 if (TREE_CODE (op0
) == INDIRECT_REF
4191 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4192 return null_pointer_node
;
4193 /* Taking the address of a nested function involves a trampoline,
4194 unless we don't need or want one. */
4195 if (TREE_CODE (op0
) == FUNCTION_DECL
4196 && decl_function_context (op0
)
4197 && !DECL_NO_STATIC_CHAIN (op0
)
4198 && !TREE_NO_TRAMPOLINE (value
))
4200 /* "&{...}" requires a temporary to hold the constructed
4202 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4208 case NON_LVALUE_EXPR
:
4209 return initializer_constant_valid_p (TREE_OPERAND (value
, 0), endtype
);
4211 case VIEW_CONVERT_EXPR
:
4213 tree src
= TREE_OPERAND (value
, 0);
4214 tree src_type
= TREE_TYPE (src
);
4215 tree dest_type
= TREE_TYPE (value
);
4217 /* Allow view-conversions from aggregate to non-aggregate type only
4218 if the bit pattern is fully preserved afterwards; otherwise, the
4219 RTL expander won't be able to apply a subsequent transformation
4220 to the underlying constructor. */
4221 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4223 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4224 return initializer_constant_valid_p (src
, endtype
);
4229 /* Allow all other kinds of view-conversion. */
4230 return initializer_constant_valid_p (src
, endtype
);
4235 tree src
= TREE_OPERAND (value
, 0);
4236 tree src_type
= TREE_TYPE (src
);
4237 tree dest_type
= TREE_TYPE (value
);
4239 /* Allow conversions between pointer types, floating-point
4240 types, and offset types. */
4241 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4242 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4243 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4244 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4245 return initializer_constant_valid_p (src
, endtype
);
4247 /* Allow length-preserving conversions between integer types. */
4248 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4249 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4250 return initializer_constant_valid_p (src
, endtype
);
4252 /* Allow conversions between other integer types only if
4254 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4256 tree inner
= initializer_constant_valid_p (src
, endtype
);
4257 if (inner
== null_pointer_node
)
4258 return null_pointer_node
;
4262 /* Allow (int) &foo provided int is as wide as a pointer. */
4263 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4264 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4265 return initializer_constant_valid_p (src
, endtype
);
4267 /* Likewise conversions from int to pointers, but also allow
4268 conversions from 0. */
4269 if ((POINTER_TYPE_P (dest_type
)
4270 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4271 && INTEGRAL_TYPE_P (src_type
))
4273 if (TREE_CODE (src
) == INTEGER_CST
4274 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4275 return null_pointer_node
;
4276 if (integer_zerop (src
))
4277 return null_pointer_node
;
4278 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4279 return initializer_constant_valid_p (src
, endtype
);
4282 /* Allow conversions to struct or union types if the value
4284 if (TREE_CODE (dest_type
) == RECORD_TYPE
4285 || TREE_CODE (dest_type
) == UNION_TYPE
)
4286 return initializer_constant_valid_p (src
, endtype
);
4290 case POINTER_PLUS_EXPR
:
4292 if (! INTEGRAL_TYPE_P (endtype
)
4293 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4295 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4297 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4299 /* If either term is absolute, use the other term's relocation. */
4300 if (valid0
== null_pointer_node
)
4302 if (valid1
== null_pointer_node
)
4306 /* Support narrowing pointer differences. */
4307 if (TREE_CODE (value
) == POINTER_PLUS_EXPR
)
4309 ret
= narrowing_initializer_constant_valid_p (value
, endtype
);
4310 if (ret
!= NULL_TREE
)
4316 if (! INTEGRAL_TYPE_P (endtype
)
4317 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4319 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4321 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4323 /* Win if second argument is absolute. */
4324 if (valid1
== null_pointer_node
)
4326 /* Win if both arguments have the same relocation.
4327 Then the value is absolute. */
4328 if (valid0
== valid1
&& valid0
!= 0)
4329 return null_pointer_node
;
4331 /* Since GCC guarantees that string constants are unique in the
4332 generated code, a subtraction between two copies of the same
4333 constant string is absolute. */
4334 if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4335 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4336 && operand_equal_p (valid0
, valid1
, 1))
4337 return null_pointer_node
;
4340 /* Support narrowing differences. */
4341 ret
= narrowing_initializer_constant_valid_p (value
, endtype
);
4342 if (ret
!= NULL_TREE
)
4354 /* Output assembler code for constant EXP to FILE, with no label.
4355 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4356 Assumes output_addressed_constants has been done on EXP already.
4358 Generate exactly SIZE bytes of assembler data, padding at the end
4359 with zeros if necessary. SIZE must always be specified.
4361 SIZE is important for structure constructors,
4362 since trailing members may have been omitted from the constructor.
4363 It is also important for initialization of arrays from string constants
4364 since the full length of the string constant might not be wanted.
4365 It is also needed for initialization of unions, where the initializer's
4366 type is just one member, and that may not be as long as the union.
4368 There a case in which we would fail to output exactly SIZE bytes:
4369 for a structure constructor that wants to produce more than SIZE bytes.
4370 But such constructors will never be generated for any possible input.
4372 ALIGN is the alignment of the data in bits. */
4375 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4377 enum tree_code code
;
4378 unsigned HOST_WIDE_INT thissize
;
4380 if (size
== 0 || flag_syntax_only
)
4383 /* See if we're trying to initialize a pointer in a non-default mode
4384 to the address of some declaration somewhere. If the target says
4385 the mode is valid for pointers, assume the target has a way of
4387 if (TREE_CODE (exp
) == NOP_EXPR
4388 && POINTER_TYPE_P (TREE_TYPE (exp
))
4389 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4391 tree saved_type
= TREE_TYPE (exp
);
4393 /* Peel off any intermediate conversions-to-pointer for valid
4395 while (TREE_CODE (exp
) == NOP_EXPR
4396 && POINTER_TYPE_P (TREE_TYPE (exp
))
4397 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4398 exp
= TREE_OPERAND (exp
, 0);
4400 /* If what we're left with is the address of something, we can
4401 convert the address to the final type and output it that
4403 if (TREE_CODE (exp
) == ADDR_EXPR
)
4404 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4405 /* Likewise for constant ints. */
4406 else if (TREE_CODE (exp
) == INTEGER_CST
)
4407 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4408 TREE_INT_CST_HIGH (exp
));
4412 /* Eliminate any conversions since we'll be outputting the underlying
4414 while (CONVERT_EXPR_P (exp
)
4415 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4416 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4418 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4419 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4421 /* Make sure eliminating the conversion is really a no-op, except with
4422 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4423 union types to allow for Ada unchecked unions. */
4424 if (type_size
> op_size
4425 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4426 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4427 /* Keep the conversion. */
4430 exp
= TREE_OPERAND (exp
, 0);
4433 code
= TREE_CODE (TREE_TYPE (exp
));
4434 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4436 /* Allow a constructor with no elements for any data type.
4437 This means to fill the space with zeros. */
4438 if (TREE_CODE (exp
) == CONSTRUCTOR
4439 && VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (exp
)))
4441 assemble_zeros (size
);
4445 if (TREE_CODE (exp
) == FDESC_EXPR
)
4447 #ifdef ASM_OUTPUT_FDESC
4448 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4449 tree decl
= TREE_OPERAND (exp
, 0);
4450 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4457 /* Now output the underlying data. If we've handling the padding, return.
4458 Otherwise, break and ensure SIZE is the size written. */
4465 case REFERENCE_TYPE
:
4467 case FIXED_POINT_TYPE
:
4468 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4469 EXPAND_INITIALIZER
),
4470 MIN (size
, thissize
), align
, 0))
4471 error ("initializer for integer/fixed-point value is too complicated");
4475 if (TREE_CODE (exp
) != REAL_CST
)
4476 error ("initializer for floating value is not a floating constant");
4478 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4482 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4483 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4484 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4489 switch (TREE_CODE (exp
))
4492 output_constructor (exp
, size
, align
);
4495 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4497 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4504 unsigned int nalign
;
4505 enum machine_mode inner
;
4507 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4508 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4510 elt_size
= GET_MODE_SIZE (inner
);
4512 link
= TREE_VECTOR_CST_ELTS (exp
);
4513 output_constant (TREE_VALUE (link
), elt_size
, align
);
4514 thissize
= elt_size
;
4515 while ((link
= TREE_CHAIN (link
)) != NULL
)
4517 output_constant (TREE_VALUE (link
), elt_size
, nalign
);
4518 thissize
+= elt_size
;
4529 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4530 output_constructor (exp
, size
, align
);
4540 if (size
> thissize
)
4541 assemble_zeros (size
- thissize
);
4545 /* Subroutine of output_constructor, used for computing the size of
4546 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4547 type with an unspecified upper bound. */
4549 static unsigned HOST_WIDE_INT
4550 array_size_for_constructor (tree val
)
4553 unsigned HOST_WIDE_INT cnt
;
4554 tree index
, value
, tmp
;
4556 /* This code used to attempt to handle string constants that are not
4557 arrays of single-bytes, but nothing else does, so there's no point in
4559 if (TREE_CODE (val
) == STRING_CST
)
4560 return TREE_STRING_LENGTH (val
);
4562 max_index
= NULL_TREE
;
4563 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4565 if (TREE_CODE (index
) == RANGE_EXPR
)
4566 index
= TREE_OPERAND (index
, 1);
4567 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4571 if (max_index
== NULL_TREE
)
4574 /* Compute the total number of array elements. */
4575 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4576 i
= size_binop (MINUS_EXPR
, fold_convert (sizetype
, max_index
),
4577 fold_convert (sizetype
, tmp
));
4578 i
= size_binop (PLUS_EXPR
, i
, build_int_cst (sizetype
, 1));
4580 /* Multiply by the array element unit size to find number of bytes. */
4581 i
= size_binop (MULT_EXPR
, i
, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4583 return tree_low_cst (i
, 1);
4586 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4587 Generate at least SIZE bytes, padding if necessary. */
4590 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
4593 tree type
= TREE_TYPE (exp
);
4596 /* Number of bytes output or skipped so far.
4597 In other words, current position within the constructor. */
4598 HOST_WIDE_INT total_bytes
= 0;
4599 /* Nonzero means BYTE contains part of a byte, to be output. */
4600 int byte_buffer_in_use
= 0;
4602 unsigned HOST_WIDE_INT cnt
;
4603 constructor_elt
*ce
;
4605 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
4607 if (TREE_CODE (type
) == RECORD_TYPE
)
4608 field
= TYPE_FIELDS (type
);
4610 if (TREE_CODE (type
) == ARRAY_TYPE
4611 && TYPE_DOMAIN (type
) != 0)
4612 min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (type
));
4614 /* As LINK goes through the elements of the constant,
4615 FIELD goes through the structure fields, if the constant is a structure.
4616 if the constant is a union, then we override this,
4617 by getting the field from the TREE_LIST element.
4618 But the constant could also be an array. Then FIELD is zero.
4620 There is always a maximum of one element in the chain LINK for unions
4621 (even if the initializer in a source program incorrectly contains
4624 VEC_iterate (constructor_elt
, CONSTRUCTOR_ELTS (exp
), cnt
, ce
);
4625 cnt
++, field
= field
? TREE_CHAIN (field
) : 0)
4627 tree val
= ce
->value
;
4630 /* The element in a union constructor specifies the proper field
4632 if ((TREE_CODE (type
) == RECORD_TYPE
|| TREE_CODE (type
) == UNION_TYPE
4633 || TREE_CODE (type
) == QUAL_UNION_TYPE
)
4637 else if (TREE_CODE (type
) == ARRAY_TYPE
)
4640 #ifdef ASM_COMMENT_START
4641 if (field
&& flag_verbose_asm
)
4642 fprintf (asm_out_file
, "%s %s:\n",
4645 ? IDENTIFIER_POINTER (DECL_NAME (field
))
4649 /* Eliminate the marker that makes a cast not be an lvalue. */
4653 if (index
&& TREE_CODE (index
) == RANGE_EXPR
)
4655 unsigned HOST_WIDE_INT fieldsize
4656 = int_size_in_bytes (TREE_TYPE (type
));
4657 HOST_WIDE_INT lo_index
= tree_low_cst (TREE_OPERAND (index
, 0), 0);
4658 HOST_WIDE_INT hi_index
= tree_low_cst (TREE_OPERAND (index
, 1), 0);
4659 HOST_WIDE_INT index
;
4660 unsigned int align2
= min_align (align
, fieldsize
* BITS_PER_UNIT
);
4662 for (index
= lo_index
; index
<= hi_index
; index
++)
4664 /* Output the element's initial value. */
4666 assemble_zeros (fieldsize
);
4668 output_constant (val
, fieldsize
, align2
);
4670 /* Count its size. */
4671 total_bytes
+= fieldsize
;
4674 else if (field
== 0 || !DECL_BIT_FIELD (field
))
4676 /* An element that is not a bit-field. */
4678 unsigned HOST_WIDE_INT fieldsize
;
4679 /* Since this structure is static,
4680 we know the positions are constant. */
4681 HOST_WIDE_INT pos
= field
? int_byte_position (field
) : 0;
4682 unsigned int align2
;
4685 pos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val
)), 1)
4686 * (tree_low_cst (index
, 0) - tree_low_cst (min_index
, 0)));
4688 /* Output any buffered-up bit-fields preceding this element. */
4689 if (byte_buffer_in_use
)
4691 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4693 byte_buffer_in_use
= 0;
4696 /* Advance to offset of this element.
4697 Note no alignment needed in an array, since that is guaranteed
4698 if each element has the proper size. */
4699 if ((field
!= 0 || index
!= 0) && pos
!= total_bytes
)
4701 gcc_assert (pos
>= total_bytes
);
4702 assemble_zeros (pos
- total_bytes
);
4706 /* Find the alignment of this element. */
4707 align2
= min_align (align
, BITS_PER_UNIT
* pos
);
4709 /* Determine size this element should occupy. */
4714 /* If this is an array with an unspecified upper bound,
4715 the initializer determines the size. */
4716 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4717 but we cannot do this until the deprecated support for
4718 initializing zero-length array members is removed. */
4719 if (TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
4720 && TYPE_DOMAIN (TREE_TYPE (field
))
4721 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field
))))
4723 fieldsize
= array_size_for_constructor (val
);
4724 /* Given a non-empty initialization, this field had
4726 gcc_assert (!fieldsize
|| !TREE_CHAIN (field
));
4728 else if (DECL_SIZE_UNIT (field
))
4730 /* ??? This can't be right. If the decl size overflows
4731 a host integer we will silently emit no data. */
4732 if (host_integerp (DECL_SIZE_UNIT (field
), 1))
4733 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (field
), 1);
4737 fieldsize
= int_size_in_bytes (TREE_TYPE (type
));
4739 /* Output the element's initial value. */
4741 assemble_zeros (fieldsize
);
4743 output_constant (val
, fieldsize
, align2
);
4745 /* Count its size. */
4746 total_bytes
+= fieldsize
;
4748 else if (val
!= 0 && TREE_CODE (val
) != INTEGER_CST
)
4749 error ("invalid initial value for member %qs",
4750 IDENTIFIER_POINTER (DECL_NAME (field
)));
4753 /* Element that is a bit-field. */
4755 HOST_WIDE_INT next_offset
= int_bit_position (field
);
4756 HOST_WIDE_INT end_offset
4757 = (next_offset
+ tree_low_cst (DECL_SIZE (field
), 1));
4760 val
= integer_zero_node
;
4762 /* If this field does not start in this (or, next) byte,
4764 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4766 /* Output remnant of any bit field in previous bytes. */
4767 if (byte_buffer_in_use
)
4769 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4771 byte_buffer_in_use
= 0;
4774 /* If still not at proper byte, advance to there. */
4775 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4777 gcc_assert (next_offset
/ BITS_PER_UNIT
>= total_bytes
);
4778 assemble_zeros (next_offset
/ BITS_PER_UNIT
- total_bytes
);
4779 total_bytes
= next_offset
/ BITS_PER_UNIT
;
4783 if (! byte_buffer_in_use
)
4786 /* We must split the element into pieces that fall within
4787 separate bytes, and combine each byte with previous or
4788 following bit-fields. */
4790 /* next_offset is the offset n fbits from the beginning of
4791 the structure to the next bit of this element to be processed.
4792 end_offset is the offset of the first bit past the end of
4794 while (next_offset
< end_offset
)
4798 HOST_WIDE_INT value
;
4799 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4800 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4802 /* Advance from byte to byte
4803 within this element when necessary. */
4804 while (next_byte
!= total_bytes
)
4806 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4811 /* Number of bits we can process at once
4812 (all part of the same byte). */
4813 this_time
= MIN (end_offset
- next_offset
,
4814 BITS_PER_UNIT
- next_bit
);
4815 if (BYTES_BIG_ENDIAN
)
4817 /* On big-endian machine, take the most significant bits
4818 first (of the bits that are significant)
4819 and put them into bytes from the most significant end. */
4820 shift
= end_offset
- next_offset
- this_time
;
4822 /* Don't try to take a bunch of bits that cross
4823 the word boundary in the INTEGER_CST. We can
4824 only select bits from the LOW or HIGH part
4826 if (shift
< HOST_BITS_PER_WIDE_INT
4827 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4829 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4830 shift
= HOST_BITS_PER_WIDE_INT
;
4833 /* Now get the bits from the appropriate constant word. */
4834 if (shift
< HOST_BITS_PER_WIDE_INT
)
4835 value
= TREE_INT_CST_LOW (val
);
4838 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4839 value
= TREE_INT_CST_HIGH (val
);
4840 shift
-= HOST_BITS_PER_WIDE_INT
;
4843 /* Get the result. This works only when:
4844 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4845 byte
|= (((value
>> shift
)
4846 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4847 << (BITS_PER_UNIT
- this_time
- next_bit
));
4851 /* On little-endian machines,
4852 take first the least significant bits of the value
4853 and pack them starting at the least significant
4854 bits of the bytes. */
4855 shift
= next_offset
- int_bit_position (field
);
4857 /* Don't try to take a bunch of bits that cross
4858 the word boundary in the INTEGER_CST. We can
4859 only select bits from the LOW or HIGH part
4861 if (shift
< HOST_BITS_PER_WIDE_INT
4862 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4863 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
4865 /* Now get the bits from the appropriate constant word. */
4866 if (shift
< HOST_BITS_PER_WIDE_INT
)
4867 value
= TREE_INT_CST_LOW (val
);
4870 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4871 value
= TREE_INT_CST_HIGH (val
);
4872 shift
-= HOST_BITS_PER_WIDE_INT
;
4875 /* Get the result. This works only when:
4876 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4877 byte
|= (((value
>> shift
)
4878 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4882 next_offset
+= this_time
;
4883 byte_buffer_in_use
= 1;
4888 if (byte_buffer_in_use
)
4890 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4894 if ((unsigned HOST_WIDE_INT
)total_bytes
< size
)
4895 assemble_zeros (size
- total_bytes
);
4898 /* Mark DECL as weak. */
4901 mark_weak (tree decl
)
4903 DECL_WEAK (decl
) = 1;
4905 if (DECL_RTL_SET_P (decl
)
4906 && MEM_P (DECL_RTL (decl
))
4907 && XEXP (DECL_RTL (decl
), 0)
4908 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
4909 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
4912 /* Merge weak status between NEWDECL and OLDDECL. */
4915 merge_weak (tree newdecl
, tree olddecl
)
4917 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
4919 if (DECL_WEAK (newdecl
) && SUPPORTS_WEAK
)
4922 /* We put the NEWDECL on the weak_decls list at some point
4923 and OLDDECL as well. Keep just OLDDECL on the list. */
4924 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
4925 if (TREE_VALUE (*pwd
) == newdecl
)
4927 *pwd
= TREE_CHAIN (*pwd
);
4934 if (DECL_WEAK (newdecl
))
4938 /* NEWDECL is weak, but OLDDECL is not. */
4940 /* If we already output the OLDDECL, we're in trouble; we can't
4941 go back and make it weak. This error cannot be caught in
4942 declare_weak because the NEWDECL and OLDDECL was not yet
4943 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4944 if (TREE_ASM_WRITTEN (olddecl
))
4945 error ("weak declaration of %q+D must precede definition",
4948 /* If we've already generated rtl referencing OLDDECL, we may
4949 have done so in a way that will not function properly with
4951 else if (TREE_USED (olddecl
)
4952 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)))
4953 warning (0, "weak declaration of %q+D after first use results "
4954 "in unspecified behavior", newdecl
);
4958 /* We put the NEWDECL on the weak_decls list at some point.
4959 Replace it with the OLDDECL. */
4960 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
4961 if (TREE_VALUE (wd
) == newdecl
)
4963 TREE_VALUE (wd
) = olddecl
;
4966 /* We may not find the entry on the list. If NEWDECL is a
4967 weak alias, then we will have already called
4968 globalize_decl to remove the entry; in that case, we do
4969 not need to do anything. */
4972 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4973 mark_weak (olddecl
);
4976 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4977 weak. Just update NEWDECL to indicate that it's weak too. */
4978 mark_weak (newdecl
);
4981 /* Declare DECL to be a weak symbol. */
4984 declare_weak (tree decl
)
4986 if (! TREE_PUBLIC (decl
))
4987 error ("weak declaration of %q+D must be public", decl
);
4988 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& TREE_ASM_WRITTEN (decl
))
4989 error ("weak declaration of %q+D must precede definition", decl
);
4990 else if (!SUPPORTS_WEAK
)
4991 warning (0, "weak declaration of %q+D not supported", decl
);
4997 weak_finish_1 (tree decl
)
4999 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5000 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5003 if (! TREE_USED (decl
))
5006 #ifdef ASM_WEAKEN_DECL
5007 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5009 #ifdef ASM_WEAKEN_LABEL
5010 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5012 #ifdef ASM_OUTPUT_WEAK_ALIAS
5014 static bool warn_once
= 0;
5017 warning (0, "only weak aliases are supported in this configuration");
5027 /* This TREE_LIST contains weakref targets. */
5029 static GTY(()) tree weakref_targets
;
5031 /* Forward declaration. */
5032 static tree
find_decl_and_mark_needed (tree decl
, tree target
);
5034 /* Emit any pending weak declarations. */
5041 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5043 tree alias_decl
= TREE_PURPOSE (t
);
5044 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5046 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5047 /* Remove alias_decl from the weak list, but leave entries for
5048 the target alone. */
5050 #ifndef ASM_OUTPUT_WEAKREF
5051 else if (! TREE_SYMBOL_REFERENCED (target
))
5053 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5054 defined, otherwise we and weak_finish_1 would use
5055 different macros. */
5056 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5057 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5059 tree decl
= find_decl_and_mark_needed (alias_decl
, target
);
5063 decl
= build_decl (TREE_CODE (alias_decl
), target
,
5064 TREE_TYPE (alias_decl
));
5066 DECL_EXTERNAL (decl
) = 1;
5067 TREE_PUBLIC (decl
) = 1;
5068 DECL_ARTIFICIAL (decl
) = 1;
5069 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5070 TREE_USED (decl
) = 1;
5073 weak_finish_1 (decl
);
5082 /* Remove the alias and the target from the pending weak list
5083 so that we do not emit any .weak directives for the former,
5084 nor multiple .weak directives for the latter. */
5085 for (p
= &weak_decls
; (t2
= *p
) ; )
5087 if (TREE_VALUE (t2
) == alias_decl
5088 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5089 *p
= TREE_CHAIN (t2
);
5091 p
= &TREE_CHAIN (t2
);
5094 /* Remove other weakrefs to the same target, to speed things up. */
5095 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5097 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5098 *p
= TREE_CHAIN (t2
);
5100 p
= &TREE_CHAIN (t2
);
5105 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5107 tree decl
= TREE_VALUE (t
);
5109 weak_finish_1 (decl
);
5113 /* Emit the assembly bits to indicate that DECL is globally visible. */
5116 globalize_decl (tree decl
)
5119 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5120 if (DECL_WEAK (decl
))
5122 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5125 #ifdef ASM_WEAKEN_DECL
5126 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5128 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5131 /* Remove this function from the pending weak list so that
5132 we do not emit multiple .weak directives for it. */
5133 for (p
= &weak_decls
; (t
= *p
) ; )
5135 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5136 *p
= TREE_CHAIN (t
);
5138 p
= &TREE_CHAIN (t
);
5141 /* Remove weakrefs to the same target from the pending weakref
5142 list, for the same reason. */
5143 for (p
= &weakref_targets
; (t
= *p
) ; )
5145 if (DECL_ASSEMBLER_NAME (decl
)
5146 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5147 *p
= TREE_CHAIN (t
);
5149 p
= &TREE_CHAIN (t
);
5156 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5159 /* We have to be able to tell cgraph about the needed-ness of the target
5160 of an alias. This requires that the decl have been defined. Aliases
5161 that precede their definition have to be queued for later processing. */
5163 typedef struct alias_pair
GTY(())
5169 /* Define gc'd vector type. */
5170 DEF_VEC_O(alias_pair
);
5171 DEF_VEC_ALLOC_O(alias_pair
,gc
);
5173 static GTY(()) VEC(alias_pair
,gc
) *alias_pairs
;
5175 /* Given an assembly name, find the decl it is associated with. At the
5176 same time, mark it needed for cgraph. */
5179 find_decl_and_mark_needed (tree decl
, tree target
)
5181 struct cgraph_node
*fnode
= NULL
;
5182 struct varpool_node
*vnode
= NULL
;
5184 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5186 fnode
= cgraph_node_for_asm (target
);
5188 vnode
= varpool_node_for_asm (target
);
5192 vnode
= varpool_node_for_asm (target
);
5194 fnode
= cgraph_node_for_asm (target
);
5199 /* We can't mark function nodes as used after cgraph global info
5200 is finished. This wouldn't generally be necessary, but C++
5201 virtual table thunks are introduced late in the game and
5202 might seem like they need marking, although in fact they
5204 if (! cgraph_global_info_ready
)
5205 cgraph_mark_needed_node (fnode
);
5210 varpool_mark_needed_node (vnode
);
5217 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5218 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5219 tree node is DECL to have the value of the tree node TARGET. */
5222 do_assemble_alias (tree decl
, tree target
)
5224 if (TREE_ASM_WRITTEN (decl
))
5227 TREE_ASM_WRITTEN (decl
) = 1;
5228 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5230 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5232 ultimate_transparent_alias_target (&target
);
5234 if (!targetm
.have_tls
5235 && TREE_CODE (decl
) == VAR_DECL
5236 && DECL_THREAD_LOCAL_P (decl
))
5238 decl
= emutls_decl (decl
);
5239 target
= get_emutls_object_name (target
);
5242 if (!TREE_SYMBOL_REFERENCED (target
))
5243 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5245 #ifdef ASM_OUTPUT_WEAKREF
5246 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5247 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5248 IDENTIFIER_POINTER (target
));
5252 error ("%Jweakref is not supported in this configuration", decl
);
5259 if (!targetm
.have_tls
5260 && TREE_CODE (decl
) == VAR_DECL
5261 && DECL_THREAD_LOCAL_P (decl
))
5263 decl
= emutls_decl (decl
);
5264 target
= get_emutls_object_name (target
);
5267 #ifdef ASM_OUTPUT_DEF
5268 /* Make name accessible from other files, if appropriate. */
5270 if (TREE_PUBLIC (decl
))
5272 globalize_decl (decl
);
5273 maybe_assemble_visibility (decl
);
5276 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5277 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5279 ASM_OUTPUT_DEF (asm_out_file
,
5280 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5281 IDENTIFIER_POINTER (target
));
5283 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5288 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5289 # ifdef ASM_WEAKEN_DECL
5290 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5292 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5294 /* Remove this function from the pending weak list so that
5295 we do not emit multiple .weak directives for it. */
5296 for (p
= &weak_decls
; (t
= *p
) ; )
5297 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5298 *p
= TREE_CHAIN (t
);
5300 p
= &TREE_CHAIN (t
);
5302 /* Remove weakrefs to the same target from the pending weakref
5303 list, for the same reason. */
5304 for (p
= &weakref_targets
; (t
= *p
) ; )
5306 if (DECL_ASSEMBLER_NAME (decl
)
5307 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5308 *p
= TREE_CHAIN (t
);
5310 p
= &TREE_CHAIN (t
);
5316 /* First pass of completing pending aliases. Make sure that cgraph knows
5317 which symbols will be required. */
5320 finish_aliases_1 (void)
5325 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5329 target_decl
= find_decl_and_mark_needed (p
->decl
, p
->target
);
5330 if (target_decl
== NULL
)
5332 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5333 error ("%q+D aliased to undefined symbol %qs",
5334 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5336 else if (DECL_EXTERNAL (target_decl
)
5337 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5338 error ("%q+D aliased to external symbol %qs",
5339 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5343 /* Second pass of completing pending aliases. Emit the actual assembly.
5344 This happens at the end of compilation and thus it is assured that the
5345 target symbol has been emitted. */
5348 finish_aliases_2 (void)
5353 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5354 do_assemble_alias (p
->decl
, p
->target
);
5356 VEC_truncate (alias_pair
, alias_pairs
, 0);
5359 /* Emit an assembler directive to make the symbol for DECL an alias to
5360 the symbol for TARGET. */
5363 assemble_alias (tree decl
, tree target
)
5366 bool is_weakref
= false;
5368 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5370 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5374 ultimate_transparent_alias_target (&target
);
5376 if (alias
== target
)
5377 error ("weakref %q+D ultimately targets itself", decl
);
5380 #ifndef ASM_OUTPUT_WEAKREF
5381 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5382 TREE_CHAIN (alias
) = target
;
5385 if (TREE_PUBLIC (decl
))
5386 error ("weakref %q+D must have static linkage", decl
);
5390 #if !defined (ASM_OUTPUT_DEF)
5391 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5392 error ("%Jalias definitions not supported in this configuration", decl
);
5395 if (!DECL_WEAK (decl
))
5397 error ("%Jonly weak aliases are supported in this configuration", decl
);
5404 /* We must force creation of DECL_RTL for debug info generation, even though
5405 we don't use it here. */
5406 make_decl_rtl (decl
);
5407 TREE_USED (decl
) = 1;
5409 /* A quirk of the initial implementation of aliases required that the user
5410 add "extern" to all of them. Which is silly, but now historical. Do
5411 note that the symbol is in fact locally defined. */
5413 DECL_EXTERNAL (decl
) = 0;
5415 /* Allow aliases to aliases. */
5416 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5417 cgraph_node (decl
)->alias
= true;
5419 varpool_node (decl
)->alias
= true;
5421 /* If the target has already been emitted, we don't have to queue the
5422 alias. This saves a tad of memory. */
5423 if (cgraph_global_info_ready
)
5424 target_decl
= find_decl_and_mark_needed (decl
, target
);
5427 if (target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5428 do_assemble_alias (decl
, target
);
5431 alias_pair
*p
= VEC_safe_push (alias_pair
, gc
, alias_pairs
, NULL
);
5437 /* Emit an assembler directive to set symbol for DECL visibility to
5438 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5441 default_assemble_visibility (tree decl
, int vis
)
5443 static const char * const visibility_types
[] = {
5444 NULL
, "protected", "hidden", "internal"
5447 const char *name
, *type
;
5449 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5450 type
= visibility_types
[vis
];
5452 #ifdef HAVE_GAS_HIDDEN
5453 fprintf (asm_out_file
, "\t.%s\t", type
);
5454 assemble_name (asm_out_file
, name
);
5455 fprintf (asm_out_file
, "\n");
5457 warning (OPT_Wattributes
, "visibility attribute not supported "
5458 "in this configuration; ignored");
5462 /* A helper function to call assemble_visibility when needed for a decl. */
5465 maybe_assemble_visibility (tree decl
)
5467 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5469 if (vis
!= VISIBILITY_DEFAULT
)
5471 targetm
.asm_out
.visibility (decl
, vis
);
5478 /* Returns 1 if the target configuration supports defining public symbols
5479 so that one of them will be chosen at link time instead of generating a
5480 multiply-defined symbol error, whether through the use of weak symbols or
5481 a target-specific mechanism for having duplicates discarded. */
5484 supports_one_only (void)
5486 if (SUPPORTS_ONE_ONLY
)
5488 return SUPPORTS_WEAK
;
5491 /* Set up DECL as a public symbol that can be defined in multiple
5492 translation units without generating a linker error. */
5495 make_decl_one_only (tree decl
)
5497 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5498 || TREE_CODE (decl
) == FUNCTION_DECL
);
5500 TREE_PUBLIC (decl
) = 1;
5502 if (SUPPORTS_ONE_ONLY
)
5504 #ifdef MAKE_DECL_ONE_ONLY
5505 MAKE_DECL_ONE_ONLY (decl
);
5507 DECL_ONE_ONLY (decl
) = 1;
5509 else if (TREE_CODE (decl
) == VAR_DECL
5510 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5511 DECL_COMMON (decl
) = 1;
5514 gcc_assert (SUPPORTS_WEAK
);
5515 DECL_WEAK (decl
) = 1;
5520 init_varasm_once (void)
5522 section_htab
= htab_create_ggc (31, section_entry_hash
,
5523 section_entry_eq
, NULL
);
5524 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5525 object_block_entry_eq
, NULL
);
5526 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5527 const_desc_eq
, NULL
);
5529 const_alias_set
= new_alias_set ();
5530 shared_constant_pool
= create_constant_pool ();
5532 #ifdef TEXT_SECTION_ASM_OP
5533 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5534 TEXT_SECTION_ASM_OP
);
5537 #ifdef DATA_SECTION_ASM_OP
5538 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5539 DATA_SECTION_ASM_OP
);
5542 #ifdef SDATA_SECTION_ASM_OP
5543 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5544 SDATA_SECTION_ASM_OP
);
5547 #ifdef READONLY_DATA_SECTION_ASM_OP
5548 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5549 READONLY_DATA_SECTION_ASM_OP
);
5552 #ifdef CTORS_SECTION_ASM_OP
5553 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5554 CTORS_SECTION_ASM_OP
);
5557 #ifdef DTORS_SECTION_ASM_OP
5558 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5559 DTORS_SECTION_ASM_OP
);
5562 #ifdef BSS_SECTION_ASM_OP
5563 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5564 output_section_asm_op
,
5565 BSS_SECTION_ASM_OP
);
5568 #ifdef SBSS_SECTION_ASM_OP
5569 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5570 output_section_asm_op
,
5571 SBSS_SECTION_ASM_OP
);
5574 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5575 | SECTION_COMMON
, emit_tls_common
);
5576 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5577 | SECTION_COMMON
, emit_local
);
5578 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5579 | SECTION_COMMON
, emit_common
);
5581 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5582 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5586 targetm
.asm_out
.init_sections ();
5588 if (readonly_data_section
== NULL
)
5589 readonly_data_section
= text_section
;
5593 decl_default_tls_model (const_tree decl
)
5595 enum tls_model kind
;
5598 is_local
= targetm
.binds_local_p (decl
);
5602 kind
= TLS_MODEL_LOCAL_EXEC
;
5604 kind
= TLS_MODEL_INITIAL_EXEC
;
5607 /* Local dynamic is inefficient when we're not combining the
5608 parts of the address. */
5609 else if (optimize
&& is_local
)
5610 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5612 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5613 if (kind
< flag_tls_default
)
5614 kind
= flag_tls_default
;
5619 /* Select a set of attributes for section NAME based on the properties
5620 of DECL and whether or not RELOC indicates that DECL's initializer
5621 might contain runtime relocations.
5623 We make the section read-only and executable for a function decl,
5624 read-only for a const data decl, and writable for a non-const data decl. */
5627 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5631 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5632 flags
= SECTION_CODE
;
5633 else if (decl
&& decl_readonly_section (decl
, reloc
))
5635 else if (current_function_decl
5637 && crtl
->subsections
.unlikely_text_section_name
5638 && strcmp (name
, crtl
->subsections
.unlikely_text_section_name
) == 0)
5639 flags
= SECTION_CODE
;
5641 && (!current_function_decl
|| !cfun
)
5642 && strcmp (name
, UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
5643 flags
= SECTION_CODE
;
5645 flags
= SECTION_WRITE
;
5647 if (decl
&& DECL_ONE_ONLY (decl
))
5648 flags
|= SECTION_LINKONCE
;
5650 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5651 flags
|= SECTION_TLS
| SECTION_WRITE
;
5653 if (strcmp (name
, ".bss") == 0
5654 || strncmp (name
, ".bss.", 5) == 0
5655 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
5656 || strcmp (name
, ".sbss") == 0
5657 || strncmp (name
, ".sbss.", 6) == 0
5658 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
5659 flags
|= SECTION_BSS
;
5661 if (strcmp (name
, ".tdata") == 0
5662 || strncmp (name
, ".tdata.", 7) == 0
5663 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
5664 flags
|= SECTION_TLS
;
5666 if (strcmp (name
, ".tbss") == 0
5667 || strncmp (name
, ".tbss.", 6) == 0
5668 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
5669 flags
|= SECTION_TLS
| SECTION_BSS
;
5671 /* These three sections have special ELF types. They are neither
5672 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5673 want to print a section type (@progbits or @nobits). If someone
5674 is silly enough to emit code or TLS variables to one of these
5675 sections, then don't handle them specially. */
5676 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
5677 && (strcmp (name
, ".init_array") == 0
5678 || strcmp (name
, ".fini_array") == 0
5679 || strcmp (name
, ".preinit_array") == 0))
5680 flags
|= SECTION_NOTYPE
;
5685 /* Return true if the target supports some form of global BSS,
5686 either through bss_noswitch_section, or by selecting a BSS
5687 section in TARGET_ASM_SELECT_SECTION. */
5690 have_global_bss_p (void)
5692 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
5695 /* Output assembly to switch to section NAME with attribute FLAGS.
5696 Four variants for common object file formats. */
5699 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
5700 unsigned int flags ATTRIBUTE_UNUSED
,
5701 tree decl ATTRIBUTE_UNUSED
)
5703 /* Some object formats don't support named sections at all. The
5704 front-end should already have flagged this as an error. */
5709 default_elf_asm_named_section (const char *name
, unsigned int flags
,
5710 tree decl ATTRIBUTE_UNUSED
)
5712 char flagchars
[10], *f
= flagchars
;
5714 /* If we have already declared this section, we can use an
5715 abbreviated form to switch back to it -- unless this section is
5716 part of a COMDAT groups, in which case GAS requires the full
5717 declaration every time. */
5718 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5719 && (flags
& SECTION_DECLARED
))
5721 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
5725 if (!(flags
& SECTION_DEBUG
))
5727 if (flags
& SECTION_WRITE
)
5729 if (flags
& SECTION_CODE
)
5731 if (flags
& SECTION_SMALL
)
5733 if (flags
& SECTION_MERGE
)
5735 if (flags
& SECTION_STRINGS
)
5737 if (flags
& SECTION_TLS
)
5739 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5743 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
5745 if (!(flags
& SECTION_NOTYPE
))
5750 if (flags
& SECTION_BSS
)
5756 #ifdef ASM_COMMENT_START
5757 /* On platforms that use "@" as the assembly comment character,
5759 if (strcmp (ASM_COMMENT_START
, "@") == 0)
5762 fprintf (asm_out_file
, format
, type
);
5764 if (flags
& SECTION_ENTSIZE
)
5765 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
5766 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5767 fprintf (asm_out_file
, ",%s,comdat",
5768 lang_hooks
.decls
.comdat_group (decl
));
5771 putc ('\n', asm_out_file
);
5775 default_coff_asm_named_section (const char *name
, unsigned int flags
,
5776 tree decl ATTRIBUTE_UNUSED
)
5778 char flagchars
[8], *f
= flagchars
;
5780 if (flags
& SECTION_WRITE
)
5782 if (flags
& SECTION_CODE
)
5786 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
5790 default_pe_asm_named_section (const char *name
, unsigned int flags
,
5793 default_coff_asm_named_section (name
, flags
, decl
);
5795 if (flags
& SECTION_LINKONCE
)
5797 /* Functions may have been compiled at various levels of
5798 optimization so we can't use `same_size' here.
5799 Instead, have the linker pick one. */
5800 fprintf (asm_out_file
, "\t.linkonce %s\n",
5801 (flags
& SECTION_CODE
? "discard" : "same_size"));
5805 /* The lame default section selector. */
5808 default_select_section (tree decl
, int reloc
,
5809 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
5813 if (decl_readonly_section (decl
, reloc
))
5814 return readonly_data_section
;
5816 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5818 if (! ((flag_pic
&& reloc
)
5819 || !TREE_READONLY (decl
)
5820 || TREE_SIDE_EFFECTS (decl
)
5821 || !TREE_CONSTANT (decl
)))
5822 return readonly_data_section
;
5824 else if (TREE_CODE (decl
) == STRING_CST
)
5825 return readonly_data_section
;
5826 else if (! (flag_pic
&& reloc
))
5827 return readonly_data_section
;
5829 return data_section
;
5832 enum section_category
5833 categorize_decl_for_section (const_tree decl
, int reloc
)
5835 enum section_category ret
;
5837 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5839 else if (TREE_CODE (decl
) == STRING_CST
)
5841 if (flag_mudflap
) /* or !flag_merge_constants */
5842 return SECCAT_RODATA
;
5844 return SECCAT_RODATA_MERGE_STR
;
5846 else if (TREE_CODE (decl
) == VAR_DECL
)
5848 if (bss_initializer_p (decl
))
5850 else if (! TREE_READONLY (decl
)
5851 || TREE_SIDE_EFFECTS (decl
)
5852 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
5854 /* Here the reloc_rw_mask is not testing whether the section should
5855 be read-only or not, but whether the dynamic link will have to
5856 do something. If so, we wish to segregate the data in order to
5857 minimize cache misses inside the dynamic linker. */
5858 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
5859 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
5863 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
5864 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
5865 else if (reloc
|| flag_merge_constants
< 2)
5866 /* C and C++ don't allow different variables to share the same
5867 location. -fmerge-all-constants allows even that (at the
5868 expense of not conforming). */
5869 ret
= SECCAT_RODATA
;
5870 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
5871 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
5873 ret
= SECCAT_RODATA_MERGE_CONST
;
5875 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5877 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
5878 || TREE_SIDE_EFFECTS (decl
)
5879 || ! TREE_CONSTANT (decl
))
5882 ret
= SECCAT_RODATA
;
5885 ret
= SECCAT_RODATA
;
5887 /* There are no read-only thread-local sections. */
5888 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TLS_MODEL (decl
))
5890 if (DECL_TLS_MODEL (decl
) == TLS_MODEL_EMULATED
)
5892 if (DECL_EMUTLS_VAR_P (decl
))
5894 if (targetm
.emutls
.var_section
)
5895 ret
= SECCAT_EMUTLS_VAR
;
5899 if (targetm
.emutls
.tmpl_prefix
)
5900 ret
= SECCAT_EMUTLS_TMPL
;
5903 /* Note that this would be *just* SECCAT_BSS, except that there's
5904 no concept of a read-only thread-local-data section. */
5905 else if (ret
== SECCAT_BSS
5906 || (flag_zero_initialized_in_bss
5907 && initializer_zerop (DECL_INITIAL (decl
))))
5913 /* If the target uses small data sections, select it. */
5914 else if (targetm
.in_small_data_p (decl
))
5916 if (ret
== SECCAT_BSS
)
5918 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
5919 ret
= SECCAT_SRODATA
;
5928 decl_readonly_section (const_tree decl
, int reloc
)
5930 switch (categorize_decl_for_section (decl
, reloc
))
5933 case SECCAT_RODATA_MERGE_STR
:
5934 case SECCAT_RODATA_MERGE_STR_INIT
:
5935 case SECCAT_RODATA_MERGE_CONST
:
5936 case SECCAT_SRODATA
:
5945 /* Select a section based on the above categorization. */
5948 default_elf_select_section (tree decl
, int reloc
,
5949 unsigned HOST_WIDE_INT align
)
5952 switch (categorize_decl_for_section (decl
, reloc
))
5955 /* We're not supposed to be called on FUNCTION_DECLs. */
5958 return readonly_data_section
;
5959 case SECCAT_RODATA_MERGE_STR
:
5960 return mergeable_string_section (decl
, align
, 0);
5961 case SECCAT_RODATA_MERGE_STR_INIT
:
5962 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
5963 case SECCAT_RODATA_MERGE_CONST
:
5964 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
5965 case SECCAT_SRODATA
:
5969 return data_section
;
5970 case SECCAT_DATA_REL
:
5971 sname
= ".data.rel";
5973 case SECCAT_DATA_REL_LOCAL
:
5974 sname
= ".data.rel.local";
5976 case SECCAT_DATA_REL_RO
:
5977 sname
= ".data.rel.ro";
5979 case SECCAT_DATA_REL_RO_LOCAL
:
5980 sname
= ".data.rel.ro.local";
5999 case SECCAT_EMUTLS_VAR
:
6000 sname
= targetm
.emutls
.var_section
;
6002 case SECCAT_EMUTLS_TMPL
:
6003 sname
= targetm
.emutls
.tmpl_section
;
6011 return get_named_section (decl
, sname
, reloc
);
6014 /* Construct a unique section name based on the decl name and the
6015 categorization performed above. */
6018 default_unique_section (tree decl
, int reloc
)
6020 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6021 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6022 const char *prefix
, *name
, *linkonce
;
6025 switch (categorize_decl_for_section (decl
, reloc
))
6028 prefix
= one_only
? ".t" : ".text";
6031 case SECCAT_RODATA_MERGE_STR
:
6032 case SECCAT_RODATA_MERGE_STR_INIT
:
6033 case SECCAT_RODATA_MERGE_CONST
:
6034 prefix
= one_only
? ".r" : ".rodata";
6036 case SECCAT_SRODATA
:
6037 prefix
= one_only
? ".s2" : ".sdata2";
6040 prefix
= one_only
? ".d" : ".data";
6042 case SECCAT_DATA_REL
:
6043 prefix
= one_only
? ".d.rel" : ".data.rel";
6045 case SECCAT_DATA_REL_LOCAL
:
6046 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6048 case SECCAT_DATA_REL_RO
:
6049 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6051 case SECCAT_DATA_REL_RO_LOCAL
:
6052 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6055 prefix
= one_only
? ".s" : ".sdata";
6058 prefix
= one_only
? ".b" : ".bss";
6061 prefix
= one_only
? ".sb" : ".sbss";
6064 prefix
= one_only
? ".td" : ".tdata";
6067 prefix
= one_only
? ".tb" : ".tbss";
6069 case SECCAT_EMUTLS_VAR
:
6070 prefix
= targetm
.emutls
.var_section
;
6072 case SECCAT_EMUTLS_TMPL
:
6073 prefix
= targetm
.emutls
.tmpl_section
;
6079 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6080 name
= targetm
.strip_name_encoding (name
);
6082 /* If we're using one_only, then there needs to be a .gnu.linkonce
6083 prefix to the section name. */
6084 linkonce
= one_only
? ".gnu.linkonce" : "";
6086 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6088 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6091 /* Like compute_reloc_for_constant, except for an RTX. The return value
6092 is a mask for which bit 1 indicates a global relocation, and bit 0
6093 indicates a local relocation. */
6096 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6098 int *preloc
= (int *) data
;
6101 switch (GET_CODE (x
))
6104 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6117 compute_reloc_for_rtx (rtx x
)
6121 switch (GET_CODE (x
))
6127 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6136 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6138 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6140 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6141 return data_section
;
6143 return readonly_data_section
;
6147 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6148 unsigned HOST_WIDE_INT align
)
6150 int reloc
= compute_reloc_for_rtx (x
);
6152 /* ??? Handle small data here somehow. */
6154 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6157 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6159 return get_named_section (NULL
, ".data.rel.ro", 3);
6162 return mergeable_constant_section (mode
, align
, 0);
6165 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6168 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6173 /* Careful not to prod global register variables. */
6176 symbol
= XEXP (rtl
, 0);
6177 if (GET_CODE (symbol
) != SYMBOL_REF
)
6180 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6181 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6182 flags
|= SYMBOL_FLAG_FUNCTION
;
6183 if (targetm
.binds_local_p (decl
))
6184 flags
|= SYMBOL_FLAG_LOCAL
;
6185 if (targetm
.have_tls
&& TREE_CODE (decl
) == VAR_DECL
6186 && DECL_THREAD_LOCAL_P (decl
))
6187 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6188 else if (targetm
.in_small_data_p (decl
))
6189 flags
|= SYMBOL_FLAG_SMALL
;
6190 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6191 being PUBLIC, the thing *must* be defined in this translation unit.
6192 Prevent this buglet from being propagated into rtl code as well. */
6193 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6194 flags
|= SYMBOL_FLAG_EXTERNAL
;
6196 SYMBOL_REF_FLAGS (symbol
) = flags
;
6199 /* By default, we do nothing for encode_section_info, so we need not
6200 do anything but discard the '*' marker. */
6203 default_strip_name_encoding (const char *str
)
6205 return str
+ (*str
== '*');
6208 #ifdef ASM_OUTPUT_DEF
6209 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6210 anchor relative to ".", the current section position. */
6213 default_asm_output_anchor (rtx symbol
)
6217 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6218 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6219 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6223 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6226 default_use_anchors_for_symbol_p (const_rtx symbol
)
6231 /* Don't use anchors for mergeable sections. The linker might move
6232 the objects around. */
6233 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6234 if (sect
->common
.flags
& SECTION_MERGE
)
6237 /* Don't use anchors for small data sections. The small data register
6238 acts as an anchor for such sections. */
6239 if (sect
->common
.flags
& SECTION_SMALL
)
6242 decl
= SYMBOL_REF_DECL (symbol
);
6243 if (decl
&& DECL_P (decl
))
6245 /* Don't use section anchors for decls that might be defined by
6247 if (!targetm
.binds_local_p (decl
))
6250 /* Don't use section anchors for decls that will be placed in a
6251 small data section. */
6252 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6253 one above. The problem is that we only use SECTION_SMALL for
6254 sections that should be marked as small in the section directive. */
6255 if (targetm
.in_small_data_p (decl
))
6261 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6262 wrt cross-module name binding. */
6265 default_binds_local_p (const_tree exp
)
6267 return default_binds_local_p_1 (exp
, flag_shlib
);
6271 default_binds_local_p_1 (const_tree exp
, int shlib
)
6275 /* A non-decl is an entry in the constant pool. */
6278 /* Weakrefs may not bind locally, even though the weakref itself is
6279 always static and therefore local. */
6280 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
)))
6282 /* Static variables are always local. */
6283 else if (! TREE_PUBLIC (exp
))
6285 /* A variable is local if the user has said explicitly that it will
6287 else if (DECL_VISIBILITY_SPECIFIED (exp
)
6288 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6290 /* Variables defined outside this object might not be local. */
6291 else if (DECL_EXTERNAL (exp
))
6293 /* If defined in this object and visibility is not default, must be
6295 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6297 /* Default visibility weak data can be overridden by a strong symbol
6298 in another module and so are not local. */
6299 else if (DECL_WEAK (exp
))
6301 /* If PIC, then assume that any global name can be overridden by
6302 symbols resolved from other modules, unless we are compiling with
6303 -fwhole-program, which assumes that names are local. */
6305 local_p
= flag_whole_program
;
6306 /* Uninitialized COMMON variable may be unified with symbols
6307 resolved from other modules. */
6308 else if (DECL_COMMON (exp
)
6309 && (DECL_INITIAL (exp
) == NULL
6310 || DECL_INITIAL (exp
) == error_mark_node
))
6312 /* Otherwise we're left with initialized (or non-common) global data
6313 which is of necessity defined locally. */
6320 /* Determine whether or not a pointer mode is valid. Assume defaults
6321 of ptr_mode or Pmode - can be overridden. */
6323 default_valid_pointer_mode (enum machine_mode mode
)
6325 return (mode
== ptr_mode
|| mode
== Pmode
);
6328 /* Default function to output code that will globalize a label. A
6329 target must define GLOBAL_ASM_OP or provide its own function to
6330 globalize a label. */
6331 #ifdef GLOBAL_ASM_OP
6333 default_globalize_label (FILE * stream
, const char *name
)
6335 fputs (GLOBAL_ASM_OP
, stream
);
6336 assemble_name (stream
, name
);
6337 putc ('\n', stream
);
6339 #endif /* GLOBAL_ASM_OP */
6341 /* Default function to output code that will globalize a declaration. */
6343 default_globalize_decl_name (FILE * stream
, tree decl
)
6345 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6346 targetm
.asm_out
.globalize_label (stream
, name
);
6349 /* Default function to output a label for unwind information. The
6350 default is to do nothing. A target that needs nonlocal labels for
6351 unwind information must provide its own function to do this. */
6353 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6354 tree decl ATTRIBUTE_UNUSED
,
6355 int for_eh ATTRIBUTE_UNUSED
,
6356 int empty ATTRIBUTE_UNUSED
)
6360 /* Default function to output a label to divide up the exception table.
6361 The default is to do nothing. A target that needs/wants to divide
6362 up the table must provide it's own function to do this. */
6364 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6368 /* This is how to output an internal numbered label where PREFIX is
6369 the class of label and LABELNO is the number within the class. */
6372 default_internal_label (FILE *stream
, const char *prefix
,
6373 unsigned long labelno
)
6375 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6376 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6377 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6380 /* This is the default behavior at the beginning of a file. It's
6381 controlled by two other target-hook toggles. */
6383 default_file_start (void)
6385 if (targetm
.file_start_app_off
&& !flag_verbose_asm
)
6386 fputs (ASM_APP_OFF
, asm_out_file
);
6388 if (targetm
.file_start_file_directive
)
6389 output_file_directive (asm_out_file
, main_input_filename
);
6392 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6393 which emits a special section directive used to indicate whether or
6394 not this object file needs an executable stack. This is primarily
6395 a GNU extension to ELF but could be used on other targets. */
6397 int trampolines_created
;
6400 file_end_indicate_exec_stack (void)
6402 unsigned int flags
= SECTION_DEBUG
;
6403 if (trampolines_created
)
6404 flags
|= SECTION_CODE
;
6406 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6409 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6410 a get_unnamed_section callback. */
6413 output_section_asm_op (const void *directive
)
6415 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6418 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6419 the current section is NEW_SECTION. */
6422 switch_to_section (section
*new_section
)
6424 if (in_section
== new_section
)
6427 if (new_section
->common
.flags
& SECTION_FORGET
)
6430 in_section
= new_section
;
6432 switch (SECTION_STYLE (new_section
))
6436 && !crtl
->subsections
.unlikely_text_section_name
6437 && strcmp (new_section
->named
.name
,
6438 UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
6439 crtl
->subsections
.unlikely_text_section_name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
6441 targetm
.asm_out
.named_section (new_section
->named
.name
,
6442 new_section
->named
.common
.flags
,
6443 new_section
->named
.decl
);
6446 case SECTION_UNNAMED
:
6447 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6450 case SECTION_NOSWITCH
:
6455 new_section
->common
.flags
|= SECTION_DECLARED
;
6458 /* If block symbol SYMBOL has not yet been assigned an offset, place
6459 it at the end of its block. */
6462 place_block_symbol (rtx symbol
)
6464 unsigned HOST_WIDE_INT size
, mask
, offset
;
6465 struct constant_descriptor_rtx
*desc
;
6466 unsigned int alignment
;
6467 struct object_block
*block
;
6470 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6471 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6474 /* Work out the symbol's size and alignment. */
6475 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6477 desc
= SYMBOL_REF_CONSTANT (symbol
);
6478 alignment
= desc
->align
;
6479 size
= GET_MODE_SIZE (desc
->mode
);
6481 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6483 decl
= SYMBOL_REF_DECL (symbol
);
6484 alignment
= get_constant_alignment (decl
);
6485 size
= get_constant_size (decl
);
6489 decl
= SYMBOL_REF_DECL (symbol
);
6490 alignment
= DECL_ALIGN (decl
);
6491 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6494 /* Calculate the object's offset from the start of the block. */
6495 block
= SYMBOL_REF_BLOCK (symbol
);
6496 mask
= alignment
/ BITS_PER_UNIT
- 1;
6497 offset
= (block
->size
+ mask
) & ~mask
;
6498 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6500 /* Record the block's new alignment and size. */
6501 block
->alignment
= MAX (block
->alignment
, alignment
);
6502 block
->size
= offset
+ size
;
6504 VEC_safe_push (rtx
, gc
, block
->objects
, symbol
);
6507 /* Return the anchor that should be used to address byte offset OFFSET
6508 from the first object in BLOCK. MODEL is the TLS model used
6512 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
6513 enum tls_model model
)
6516 unsigned int begin
, middle
, end
;
6517 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
6520 /* Work out the anchor's offset. Use an offset of 0 for the first
6521 anchor so that we don't pessimize the case where we take the address
6522 of a variable at the beginning of the block. This is particularly
6523 useful when a block has only one variable assigned to it.
6525 We try to place anchors RANGE bytes apart, so there can then be
6526 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6527 a ptr_mode offset. With some target settings, the lowest such
6528 anchor might be out of range for the lowest ptr_mode offset;
6529 likewise the highest anchor for the highest offset. Use anchors
6530 at the extreme ends of the ptr_mode range in such cases.
6532 All arithmetic uses unsigned integers in order to avoid
6534 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
6535 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
6536 range
= max_offset
- min_offset
+ 1;
6541 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
6544 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
6545 delta
-= delta
% range
;
6548 offset
= (HOST_WIDE_INT
) (-delta
);
6552 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
6553 delta
-= delta
% range
;
6554 if (delta
> bias
- 1)
6556 offset
= (HOST_WIDE_INT
) delta
;
6560 /* Do a binary search to see if there's already an anchor we can use.
6561 Set BEGIN to the new anchor's index if not. */
6563 end
= VEC_length (rtx
, block
->anchors
);
6564 while (begin
!= end
)
6566 middle
= (end
+ begin
) / 2;
6567 anchor
= VEC_index (rtx
, block
->anchors
, middle
);
6568 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
6570 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
6572 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
6574 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
6580 /* Create a new anchor with a unique label. */
6581 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
6582 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
6583 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
6584 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
6586 /* Insert it at index BEGIN. */
6587 VEC_safe_insert (rtx
, gc
, block
->anchors
, begin
, anchor
);
6591 /* Output the objects in BLOCK. */
6594 output_object_block (struct object_block
*block
)
6596 struct constant_descriptor_rtx
*desc
;
6598 HOST_WIDE_INT offset
;
6602 if (block
->objects
== NULL
)
6605 /* Switch to the section and make sure that the first byte is
6606 suitably aligned. */
6607 switch_to_section (block
->sect
);
6608 assemble_align (block
->alignment
);
6610 /* Define the values of all anchors relative to the current section
6612 for (i
= 0; VEC_iterate (rtx
, block
->anchors
, i
, symbol
); i
++)
6613 targetm
.asm_out
.output_anchor (symbol
);
6615 /* Output the objects themselves. */
6617 for (i
= 0; VEC_iterate (rtx
, block
->objects
, i
, symbol
); i
++)
6619 /* Move to the object's offset, padding with zeros if necessary. */
6620 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
6621 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
6622 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6624 desc
= SYMBOL_REF_CONSTANT (symbol
);
6625 output_constant_pool_1 (desc
, 1);
6626 offset
+= GET_MODE_SIZE (desc
->mode
);
6628 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6630 decl
= SYMBOL_REF_DECL (symbol
);
6631 assemble_constant_contents (decl
, XSTR (symbol
, 0),
6632 get_constant_alignment (decl
));
6633 offset
+= get_constant_size (decl
);
6637 decl
= SYMBOL_REF_DECL (symbol
);
6638 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
6639 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6644 /* A htab_traverse callback used to call output_object_block for
6645 each member of object_block_htab. */
6648 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
6650 output_object_block ((struct object_block
*) (*slot
));
6654 /* Output the definitions of all object_blocks. */
6657 output_object_blocks (void)
6659 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
6662 /* This function provides a possible implementation of the
6663 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6664 by -frecord-gcc-switches it creates a new mergeable, string section in the
6665 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6666 contains the switches in ASCII format.
6668 FIXME: This code does not correctly handle double quote characters
6669 that appear inside strings, (it strips them rather than preserving them).
6670 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6671 characters - instead it treats them as sub-string separators. Since
6672 we want to emit NUL strings terminators into the object file we have to use
6676 elf_record_gcc_switches (print_switch_type type
, const char * name
)
6678 static char buffer
[1024];
6680 /* This variable is used as part of a simplistic heuristic to detect
6681 command line switches which take an argument:
6683 "If a command line option does not start with a dash then
6684 it is an argument for the previous command line option."
6686 This fails in the case of the command line option which is the name
6687 of the file to compile, but otherwise it is pretty reasonable. */
6688 static bool previous_name_held_back
= FALSE
;
6692 case SWITCH_TYPE_PASSED
:
6695 if (previous_name_held_back
)
6697 unsigned int len
= strlen (buffer
);
6699 snprintf (buffer
+ len
, sizeof buffer
- len
, " %s", name
);
6700 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6701 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6702 previous_name_held_back
= FALSE
;
6706 strncpy (buffer
, name
, sizeof buffer
);
6707 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6708 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6713 if (previous_name_held_back
)
6715 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6716 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6719 strncpy (buffer
, name
, sizeof buffer
);
6720 previous_name_held_back
= TRUE
;
6724 case SWITCH_TYPE_DESCRIPTIVE
:
6727 /* Distinguish between invocations where name is NULL. */
6728 static bool started
= false;
6732 if (previous_name_held_back
)
6734 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6735 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6742 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
6746 | (SECTION_ENTSIZE
& 1),
6748 switch_to_section (sec
);
6757 /* The return value is currently ignored by the caller, but must be 0.
6758 For -fverbose-asm the return value would be the number of characters
6759 emitted into the assembler file. */
6763 /* Emit text to declare externally defined symbols. It is needed to
6764 properly support non-default visibility. */
6766 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
6768 const char *name ATTRIBUTE_UNUSED
)
6770 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6771 set in order to avoid putting out names that are never really
6773 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
6774 && targetm
.binds_local_p (decl
))
6775 maybe_assemble_visibility (decl
);
6778 #include "gt-varasm.h"