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 and qualifiers such as weakness. (Most assemblers don't need
2295 extern declaration, so we normally output nothing.) Do nothing if
2296 DECL is not external. */
2299 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2301 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2302 main body of this code is only rarely exercised. To provide some
2303 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2304 open. If it's not, we should not be calling this function. */
2305 gcc_assert (asm_out_file
);
2307 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2310 /* We want to output annotation for weak and external symbols at
2311 very last to check if they are references or not. */
2313 if (SUPPORTS_WEAK
&& DECL_WEAK (decl
)
2314 /* TREE_STATIC is a weird and abused creature which is not
2315 generally the right test for whether an entity has been
2316 locally emitted, inlined or otherwise not-really-extern, but
2317 for declarations that can be weak, it happens to be
2319 && !TREE_STATIC (decl
))
2320 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2322 #ifdef ASM_OUTPUT_EXTERNAL
2323 pending_assemble_externals
= tree_cons (0, decl
,
2324 pending_assemble_externals
);
2328 /* Similar, for calling a library function FUN. */
2331 assemble_external_libcall (rtx fun
)
2333 /* Declare library function name external when first used, if nec. */
2334 if (! SYMBOL_REF_USED (fun
))
2336 SYMBOL_REF_USED (fun
) = 1;
2337 targetm
.asm_out
.external_libcall (fun
);
2341 /* Assemble a label named NAME. */
2344 assemble_label (const char *name
)
2346 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2349 /* Set the symbol_referenced flag for ID. */
2351 mark_referenced (tree id
)
2353 TREE_SYMBOL_REFERENCED (id
) = 1;
2356 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2358 mark_decl_referenced (tree decl
)
2360 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2362 /* Extern inline functions don't become needed when referenced.
2363 If we know a method will be emitted in other TU and no new
2364 functions can be marked reachable, just use the external
2366 struct cgraph_node
*node
= cgraph_node (decl
);
2367 if (!DECL_EXTERNAL (decl
)
2368 && (!node
->local
.vtable_method
|| !cgraph_global_info_ready
2369 || !node
->local
.finalized
))
2370 cgraph_mark_needed_node (node
);
2372 else if (TREE_CODE (decl
) == VAR_DECL
)
2374 struct varpool_node
*node
= varpool_node (decl
);
2375 varpool_mark_needed_node (node
);
2376 /* C++ frontend use mark_decl_references to force COMDAT variables
2377 to be output that might appear dead otherwise. */
2378 node
->force_output
= true;
2380 /* else do nothing - we can get various sorts of CST nodes here,
2381 which do not need to be marked. */
2385 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2386 until we find an identifier that is not itself a transparent alias.
2387 Modify the alias passed to it by reference (and all aliases on the
2388 way to the ultimate target), such that they do not have to be
2389 followed again, and return the ultimate target of the alias
2393 ultimate_transparent_alias_target (tree
*alias
)
2395 tree target
= *alias
;
2397 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2399 gcc_assert (TREE_CHAIN (target
));
2400 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2401 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2402 && ! TREE_CHAIN (target
));
2409 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2410 starts with a *, the rest of NAME is output verbatim. Otherwise
2411 NAME is transformed in a target-specific way (usually by the
2412 addition of an underscore). */
2415 assemble_name_raw (FILE *file
, const char *name
)
2418 fputs (&name
[1], file
);
2420 ASM_OUTPUT_LABELREF (file
, name
);
2423 /* Like assemble_name_raw, but should be used when NAME might refer to
2424 an entity that is also represented as a tree (like a function or
2425 variable). If NAME does refer to such an entity, that entity will
2426 be marked as referenced. */
2429 assemble_name (FILE *file
, const char *name
)
2431 const char *real_name
;
2434 real_name
= targetm
.strip_name_encoding (name
);
2436 id
= maybe_get_identifier (real_name
);
2441 mark_referenced (id
);
2442 ultimate_transparent_alias_target (&id
);
2444 name
= IDENTIFIER_POINTER (id
);
2445 gcc_assert (! TREE_CHAIN (id
));
2448 assemble_name_raw (file
, name
);
2451 /* Allocate SIZE bytes writable static space with a gensym name
2452 and return an RTX to refer to its address. */
2455 assemble_static_space (unsigned HOST_WIDE_INT size
)
2458 const char *namestring
;
2461 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2463 namestring
= ggc_strdup (name
);
2465 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2466 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2468 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2469 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2472 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2473 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2476 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2477 so that each uninitialized object starts on such a boundary. */
2478 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2479 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2480 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2481 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2482 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2483 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2490 /* Assemble the static constant template for function entry trampolines.
2491 This is done at most once per compilation.
2492 Returns an RTX for the address of the template. */
2494 static GTY(()) rtx initial_trampoline
;
2496 #ifdef TRAMPOLINE_TEMPLATE
2498 assemble_trampoline_template (void)
2505 if (initial_trampoline
)
2506 return initial_trampoline
;
2508 /* By default, put trampoline templates in read-only data section. */
2510 #ifdef TRAMPOLINE_SECTION
2511 switch_to_section (TRAMPOLINE_SECTION
);
2513 switch_to_section (readonly_data_section
);
2516 /* Write the assembler code to define one. */
2517 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2520 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2523 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2524 TRAMPOLINE_TEMPLATE (asm_out_file
);
2526 /* Record the rtl to refer to it. */
2527 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2528 name
= ggc_strdup (label
);
2529 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2530 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2532 initial_trampoline
= gen_rtx_MEM (BLKmode
, symbol
);
2533 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2535 return initial_trampoline
;
2539 /* A and B are either alignments or offsets. Return the minimum alignment
2540 that may be assumed after adding the two together. */
2542 static inline unsigned
2543 min_align (unsigned int a
, unsigned int b
)
2545 return (a
| b
) & -(a
| b
);
2548 /* Return the assembler directive for creating a given kind of integer
2549 object. SIZE is the number of bytes in the object and ALIGNED_P
2550 indicates whether it is known to be aligned. Return NULL if the
2551 assembly dialect has no such directive.
2553 The returned string should be printed at the start of a new line and
2554 be followed immediately by the object's initial value. */
2557 integer_asm_op (int size
, int aligned_p
)
2559 struct asm_int_op
*ops
;
2562 ops
= &targetm
.asm_out
.aligned_op
;
2564 ops
= &targetm
.asm_out
.unaligned_op
;
2569 return targetm
.asm_out
.byte_op
;
2583 /* Use directive OP to assemble an integer object X. Print OP at the
2584 start of the line, followed immediately by the value of X. */
2587 assemble_integer_with_op (const char *op
, rtx x
)
2589 fputs (op
, asm_out_file
);
2590 output_addr_const (asm_out_file
, x
);
2591 fputc ('\n', asm_out_file
);
2594 /* The default implementation of the asm_out.integer target hook. */
2597 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2598 unsigned int size ATTRIBUTE_UNUSED
,
2599 int aligned_p ATTRIBUTE_UNUSED
)
2601 const char *op
= integer_asm_op (size
, aligned_p
);
2602 /* Avoid GAS bugs for large values. Specifically negative values whose
2603 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2604 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2606 return op
&& (assemble_integer_with_op (op
, x
), true);
2609 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2610 the alignment of the integer in bits. Return 1 if we were able to output
2611 the constant, otherwise 0. We must be able to output the constant,
2612 if FORCE is nonzero. */
2615 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2619 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2621 /* See if the target hook can handle this kind of object. */
2622 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2625 /* If the object is a multi-byte one, try splitting it up. Split
2626 it into words it if is multi-word, otherwise split it into bytes. */
2629 enum machine_mode omode
, imode
;
2630 unsigned int subalign
;
2631 unsigned int subsize
, i
;
2632 unsigned char mclass
;
2634 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2635 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2636 if (GET_CODE (x
) == CONST_FIXED
)
2637 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2641 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2642 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2644 for (i
= 0; i
< size
; i
+= subsize
)
2646 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2647 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2653 /* If we've printed some of it, but not all of it, there's no going
2658 gcc_assert (!force
);
2664 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2666 long data
[4] = {0, 0, 0, 0};
2668 int bitsize
, nelts
, nunits
, units_per
;
2670 /* This is hairy. We have a quantity of known size. real_to_target
2671 will put it into an array of *host* longs, 32 bits per element
2672 (even if long is more than 32 bits). We need to determine the
2673 number of array elements that are occupied (nelts) and the number
2674 of *target* min-addressable units that will be occupied in the
2675 object file (nunits). We cannot assume that 32 divides the
2676 mode's bitsize (size * BITS_PER_UNIT) evenly.
2678 size * BITS_PER_UNIT is used here to make sure that padding bits
2679 (which might appear at either end of the value; real_to_target
2680 will include the padding bits in its output array) are included. */
2682 nunits
= GET_MODE_SIZE (mode
);
2683 bitsize
= nunits
* BITS_PER_UNIT
;
2684 nelts
= CEIL (bitsize
, 32);
2685 units_per
= 32 / BITS_PER_UNIT
;
2687 real_to_target (data
, &d
, mode
);
2689 /* Put out the first word with the specified alignment. */
2690 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2691 nunits
-= units_per
;
2693 /* Subsequent words need only 32-bit alignment. */
2694 align
= min_align (align
, 32);
2696 for (i
= 1; i
< nelts
; i
++)
2698 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2699 nunits
-= units_per
;
2703 /* Given an expression EXP with a constant value,
2704 reduce it to the sum of an assembler symbol and an integer.
2705 Store them both in the structure *VALUE.
2706 EXP must be reducible. */
2708 struct addr_const
GTY(())
2711 HOST_WIDE_INT offset
;
2715 decode_addr_const (tree exp
, struct addr_const
*value
)
2717 tree target
= TREE_OPERAND (exp
, 0);
2723 if (TREE_CODE (target
) == COMPONENT_REF
2724 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2727 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2728 target
= TREE_OPERAND (target
, 0);
2730 else if (TREE_CODE (target
) == ARRAY_REF
2731 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2733 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2734 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2735 target
= TREE_OPERAND (target
, 0);
2741 switch (TREE_CODE (target
))
2745 x
= DECL_RTL (target
);
2749 x
= gen_rtx_MEM (FUNCTION_MODE
,
2750 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2759 x
= output_constant_def (target
, 1);
2766 gcc_assert (MEM_P (x
));
2770 value
->offset
= offset
;
2773 /* Uniquize all constants that appear in memory.
2774 Each constant in memory thus far output is recorded
2775 in `const_desc_table'. */
2777 struct constant_descriptor_tree
GTY(())
2779 /* A MEM for the constant. */
2782 /* The value of the constant. */
2785 /* Hash of value. Computing the hash from value each time
2786 hashfn is called can't work properly, as that means recursive
2787 use of the hash table during hash table expansion. */
2791 static GTY((param_is (struct constant_descriptor_tree
)))
2792 htab_t const_desc_htab
;
2794 static struct constant_descriptor_tree
* build_constant_desc (tree
);
2795 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2797 /* Compute a hash code for a constant expression. */
2800 const_desc_hash (const void *ptr
)
2802 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2806 const_hash_1 (const tree exp
)
2811 enum tree_code code
= TREE_CODE (exp
);
2813 /* Either set P and LEN to the address and len of something to hash and
2814 exit the switch or return a value. */
2819 p
= (char *) &TREE_INT_CST (exp
);
2820 len
= sizeof TREE_INT_CST (exp
);
2824 return real_hash (TREE_REAL_CST_PTR (exp
));
2827 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2830 p
= TREE_STRING_POINTER (exp
);
2831 len
= TREE_STRING_LENGTH (exp
);
2835 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2836 + const_hash_1 (TREE_IMAGPART (exp
)));
2840 unsigned HOST_WIDE_INT idx
;
2843 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2845 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2847 hi
= hi
* 603 + const_hash_1 (value
);
2855 struct addr_const value
;
2857 decode_addr_const (exp
, &value
);
2858 switch (GET_CODE (value
.base
))
2861 /* Don't hash the address of the SYMBOL_REF;
2862 only use the offset and the symbol name. */
2864 p
= XSTR (value
.base
, 0);
2865 for (i
= 0; p
[i
] != 0; i
++)
2866 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2870 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2880 case POINTER_PLUS_EXPR
:
2882 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2883 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2886 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2889 /* A language specific constant. Just hash the code. */
2893 /* Compute hashing function. */
2895 for (i
= 0; i
< len
; i
++)
2896 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2901 /* Wrapper of compare_constant, for the htab interface. */
2903 const_desc_eq (const void *p1
, const void *p2
)
2905 const struct constant_descriptor_tree
*const c1
2906 = (const struct constant_descriptor_tree
*) p1
;
2907 const struct constant_descriptor_tree
*const c2
2908 = (const struct constant_descriptor_tree
*) p2
;
2909 if (c1
->hash
!= c2
->hash
)
2911 return compare_constant (c1
->value
, c2
->value
);
2914 /* Compare t1 and t2, and return 1 only if they are known to result in
2915 the same bit pattern on output. */
2918 compare_constant (const tree t1
, const tree t2
)
2920 enum tree_code typecode
;
2922 if (t1
== NULL_TREE
)
2923 return t2
== NULL_TREE
;
2924 if (t2
== NULL_TREE
)
2927 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2930 switch (TREE_CODE (t1
))
2933 /* Integer constants are the same only if the same width of type. */
2934 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2936 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2938 return tree_int_cst_equal (t1
, t2
);
2941 /* Real constants are the same only if the same width of type. */
2942 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2945 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2948 /* Fixed constants are the same only if the same width of type. */
2949 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2952 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2955 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2958 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2959 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2960 TREE_STRING_LENGTH (t1
)));
2963 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2964 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2968 VEC(constructor_elt
, gc
) *v1
, *v2
;
2969 unsigned HOST_WIDE_INT idx
;
2971 typecode
= TREE_CODE (TREE_TYPE (t1
));
2972 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2975 if (typecode
== ARRAY_TYPE
)
2977 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2978 /* For arrays, check that the sizes all match. */
2979 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2981 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2986 /* For record and union constructors, require exact type
2988 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2992 v1
= CONSTRUCTOR_ELTS (t1
);
2993 v2
= CONSTRUCTOR_ELTS (t2
);
2994 if (VEC_length (constructor_elt
, v1
)
2995 != VEC_length (constructor_elt
, v2
))
2998 for (idx
= 0; idx
< VEC_length (constructor_elt
, v1
); ++idx
)
3000 constructor_elt
*c1
= VEC_index (constructor_elt
, v1
, idx
);
3001 constructor_elt
*c2
= VEC_index (constructor_elt
, v2
, idx
);
3003 /* Check that each value is the same... */
3004 if (!compare_constant (c1
->value
, c2
->value
))
3006 /* ... and that they apply to the same fields! */
3007 if (typecode
== ARRAY_TYPE
)
3009 if (!compare_constant (c1
->index
, c2
->index
))
3014 if (c1
->index
!= c2
->index
)
3025 struct addr_const value1
, value2
;
3027 decode_addr_const (t1
, &value1
);
3028 decode_addr_const (t2
, &value2
);
3029 return (value1
.offset
== value2
.offset
3030 && strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3034 case POINTER_PLUS_EXPR
:
3037 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3038 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3041 case VIEW_CONVERT_EXPR
:
3042 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3051 /* Make a copy of the whole tree structure for a constant. This
3052 handles the same types of nodes that compare_constant handles. */
3055 copy_constant (tree exp
)
3057 switch (TREE_CODE (exp
))
3060 /* For ADDR_EXPR, we do not want to copy the decl whose address
3061 is requested. We do want to copy constants though. */
3062 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
3063 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3064 copy_constant (TREE_OPERAND (exp
, 0)));
3066 return copy_node (exp
);
3072 return copy_node (exp
);
3075 return build_complex (TREE_TYPE (exp
),
3076 copy_constant (TREE_REALPART (exp
)),
3077 copy_constant (TREE_IMAGPART (exp
)));
3080 case POINTER_PLUS_EXPR
:
3082 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3083 copy_constant (TREE_OPERAND (exp
, 0)),
3084 copy_constant (TREE_OPERAND (exp
, 1)));
3087 case VIEW_CONVERT_EXPR
:
3088 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3089 copy_constant (TREE_OPERAND (exp
, 0)));
3093 tree copy
= copy_node (exp
);
3094 VEC(constructor_elt
, gc
) *v
;
3095 unsigned HOST_WIDE_INT idx
;
3096 tree purpose
, value
;
3098 v
= VEC_alloc(constructor_elt
, gc
, VEC_length(constructor_elt
,
3099 CONSTRUCTOR_ELTS (exp
)));
3100 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3102 constructor_elt
*ce
= VEC_quick_push (constructor_elt
, v
, NULL
);
3103 ce
->index
= purpose
;
3104 ce
->value
= copy_constant (value
);
3106 CONSTRUCTOR_ELTS (copy
) = v
;
3115 /* Return the alignment of constant EXP in bits. */
3118 get_constant_alignment (tree exp
)
3122 align
= TYPE_ALIGN (TREE_TYPE (exp
));
3123 #ifdef CONSTANT_ALIGNMENT
3124 align
= CONSTANT_ALIGNMENT (exp
, align
);
3129 /* Return the section into which constant EXP should be placed. */
3132 get_constant_section (tree exp
)
3134 if (IN_NAMED_SECTION (exp
))
3135 return get_named_section (exp
, NULL
, compute_reloc_for_constant (exp
));
3137 return targetm
.asm_out
.select_section (exp
,
3138 compute_reloc_for_constant (exp
),
3139 get_constant_alignment (exp
));
3142 /* Return the size of constant EXP in bytes. */
3144 static HOST_WIDE_INT
3145 get_constant_size (tree exp
)
3149 size
= int_size_in_bytes (TREE_TYPE (exp
));
3150 if (TREE_CODE (exp
) == STRING_CST
)
3151 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3155 /* Subroutine of output_constant_def:
3156 No constant equal to EXP is known to have been output.
3157 Make a constant descriptor to enter EXP in the hash table.
3158 Assign the label number and construct RTL to refer to the
3159 constant's location in memory.
3160 Caller is responsible for updating the hash table. */
3162 static struct constant_descriptor_tree
*
3163 build_constant_desc (tree exp
)
3169 struct constant_descriptor_tree
*desc
;
3171 desc
= GGC_NEW (struct constant_descriptor_tree
);
3172 desc
->value
= copy_constant (exp
);
3174 /* Propagate marked-ness to copied constant. */
3175 if (flag_mudflap
&& mf_marked_p (exp
))
3176 mf_mark (desc
->value
);
3178 /* Create a string containing the label name, in LABEL. */
3179 labelno
= const_labelno
++;
3180 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3182 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3183 if (use_object_blocks_p ())
3185 section
*sect
= get_constant_section (exp
);
3186 symbol
= create_block_symbol (ggc_strdup (label
),
3187 get_block_for_section (sect
), -1);
3190 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3191 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3192 SET_SYMBOL_REF_DECL (symbol
, desc
->value
);
3193 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3195 rtl
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3196 set_mem_attributes (rtl
, exp
, 1);
3197 set_mem_alias_set (rtl
, 0);
3198 set_mem_alias_set (rtl
, const_alias_set
);
3200 /* Set flags or add text to the name to record information, such as
3201 that it is a local symbol. If the name is changed, the macro
3202 ASM_OUTPUT_LABELREF will have to know how to strip this
3203 information. This call might invalidate our local variable
3204 SYMBOL; we can't use it afterward. */
3206 targetm
.encode_section_info (exp
, rtl
, true);
3213 /* Return an rtx representing a reference to constant data in memory
3214 for the constant expression EXP.
3216 If assembler code for such a constant has already been output,
3217 return an rtx to refer to it.
3218 Otherwise, output such a constant in memory
3219 and generate an rtx for it.
3221 If DEFER is nonzero, this constant can be deferred and output only
3222 if referenced in the function after all optimizations.
3224 `const_desc_table' records which constants already have label strings. */
3227 output_constant_def (tree exp
, int defer
)
3229 struct constant_descriptor_tree
*desc
;
3230 struct constant_descriptor_tree key
;
3233 /* Look up EXP in the table of constant descriptors. If we didn't find
3234 it, create a new one. */
3236 key
.hash
= const_hash_1 (exp
);
3237 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3239 desc
= (struct constant_descriptor_tree
*) *loc
;
3242 desc
= build_constant_desc (exp
);
3243 desc
->hash
= key
.hash
;
3247 maybe_output_constant_def_contents (desc
, defer
);
3251 /* Subroutine of output_constant_def: Decide whether or not we need to
3252 output the constant DESC now, and if so, do it. */
3254 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3257 rtx symbol
= XEXP (desc
->rtl
, 0);
3258 tree exp
= desc
->value
;
3260 if (flag_syntax_only
)
3263 if (TREE_ASM_WRITTEN (exp
))
3264 /* Already output; don't do it again. */
3267 /* We can always defer constants as long as the context allows
3271 /* Increment n_deferred_constants if it exists. It needs to be at
3272 least as large as the number of constants actually referred to
3273 by the function. If it's too small we'll stop looking too early
3274 and fail to emit constants; if it's too large we'll only look
3275 through the entire function when we could have stopped earlier. */
3277 n_deferred_constants
++;
3281 output_constant_def_contents (symbol
);
3284 /* Subroutine of output_constant_def_contents. Output the definition
3285 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3286 constant's alignment in bits. */
3289 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3293 size
= get_constant_size (exp
);
3295 /* Do any machine/system dependent processing of the constant. */
3296 #ifdef ASM_DECLARE_CONSTANT_NAME
3297 ASM_DECLARE_CONSTANT_NAME (asm_out_file
, label
, exp
, size
);
3299 /* Standard thing is just output label for the constant. */
3300 ASM_OUTPUT_LABEL (asm_out_file
, label
);
3301 #endif /* ASM_DECLARE_CONSTANT_NAME */
3303 /* Output the value of EXP. */
3304 output_constant (exp
, size
, align
);
3307 /* We must output the constant data referred to by SYMBOL; do so. */
3310 output_constant_def_contents (rtx symbol
)
3312 tree exp
= SYMBOL_REF_DECL (symbol
);
3315 /* Make sure any other constants whose addresses appear in EXP
3316 are assigned label numbers. */
3317 output_addressed_constants (exp
);
3319 /* We are no longer deferring this constant. */
3320 TREE_ASM_WRITTEN (exp
) = 1;
3322 /* If the constant is part of an object block, make sure that the
3323 decl has been positioned within its block, but do not write out
3324 its definition yet. output_object_blocks will do that later. */
3325 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3326 place_block_symbol (symbol
);
3329 switch_to_section (get_constant_section (exp
));
3330 align
= get_constant_alignment (exp
);
3331 if (align
> BITS_PER_UNIT
)
3332 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3333 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3336 mudflap_enqueue_constant (exp
);
3339 /* Look up EXP in the table of constant descriptors. Return the rtl
3340 if it has been emitted, else null. */
3343 lookup_constant_def (tree exp
)
3345 struct constant_descriptor_tree
*desc
;
3346 struct constant_descriptor_tree key
;
3349 key
.hash
= const_hash_1 (exp
);
3350 desc
= (struct constant_descriptor_tree
*)
3351 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3353 return (desc
? desc
->rtl
: NULL_RTX
);
3356 /* Used in the hash tables to avoid outputting the same constant
3357 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3358 are output once per function, not once per file. */
3359 /* ??? Only a few targets need per-function constant pools. Most
3360 can use one per-file pool. Should add a targetm bit to tell the
3363 struct rtx_constant_pool
GTY(())
3365 /* Pointers to first and last constant in pool, as ordered by offset. */
3366 struct constant_descriptor_rtx
*first
;
3367 struct constant_descriptor_rtx
*last
;
3369 /* Hash facility for making memory-constants from constant rtl-expressions.
3370 It is used on RISC machines where immediate integer arguments and
3371 constant addresses are restricted so that such constants must be stored
3373 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3375 /* Current offset in constant pool (does not include any
3376 machine-specific header). */
3377 HOST_WIDE_INT offset
;
3380 struct constant_descriptor_rtx
GTY((chain_next ("%h.next")))
3382 struct constant_descriptor_rtx
*next
;
3386 HOST_WIDE_INT offset
;
3388 enum machine_mode mode
;
3394 /* Hash and compare functions for const_rtx_htab. */
3397 const_desc_rtx_hash (const void *ptr
)
3399 const struct constant_descriptor_rtx
*const desc
3400 = (const struct constant_descriptor_rtx
*) ptr
;
3405 const_desc_rtx_eq (const void *a
, const void *b
)
3407 const struct constant_descriptor_rtx
*const x
3408 = (const struct constant_descriptor_rtx
*) a
;
3409 const struct constant_descriptor_rtx
*const y
3410 = (const struct constant_descriptor_rtx
*) b
;
3412 if (x
->mode
!= y
->mode
)
3414 return rtx_equal_p (x
->constant
, y
->constant
);
3417 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3420 const_rtx_hash_1 (rtx
*xp
, void *data
)
3422 unsigned HOST_WIDE_INT hwi
;
3423 enum machine_mode mode
;
3429 code
= GET_CODE (x
);
3430 mode
= GET_MODE (x
);
3431 h
= (hashval_t
) code
* 1048573 + mode
;
3439 const int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3440 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3443 h
^= (hashval_t
) hwi
;
3444 for (i
= 1; i
< n
; ++i
)
3447 h
^= (hashval_t
) hwi
;
3453 if (mode
== VOIDmode
)
3455 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3459 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3463 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3469 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3470 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3475 h
^= htab_hash_string (XSTR (x
, 0));
3479 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3483 case UNSPEC_VOLATILE
:
3484 h
= h
* 251 + XINT (x
, 1);
3491 hp
= (hashval_t
*) data
;
3492 *hp
= *hp
* 509 + h
;
3496 /* Compute a hash value for X, which should be a constant. */
3499 const_rtx_hash (rtx x
)
3502 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3507 /* Create and return a new rtx constant pool. */
3509 static struct rtx_constant_pool
*
3510 create_constant_pool (void)
3512 struct rtx_constant_pool
*pool
;
3514 pool
= GGC_NEW (struct rtx_constant_pool
);
3515 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3516 const_desc_rtx_eq
, NULL
);
3523 /* Initialize constant pool hashing for a new function. */
3526 init_varasm_status (void)
3528 crtl
->varasm
.pool
= create_constant_pool ();
3529 crtl
->varasm
.deferred_constants
= 0;
3532 /* Given a MINUS expression, simplify it if both sides
3533 include the same symbol. */
3536 simplify_subtraction (rtx x
)
3538 rtx r
= simplify_rtx (x
);
3542 /* Given a constant rtx X, make (or find) a memory constant for its value
3543 and return a MEM rtx to refer to it in memory. */
3546 force_const_mem (enum machine_mode mode
, rtx x
)
3548 struct constant_descriptor_rtx
*desc
, tmp
;
3549 struct rtx_constant_pool
*pool
;
3556 /* If we're not allowed to drop X into the constant pool, don't. */
3557 if (targetm
.cannot_force_const_mem (x
))
3560 /* Record that this function has used a constant pool entry. */
3561 crtl
->uses_const_pool
= 1;
3563 /* Decide which pool to use. */
3564 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3565 ? shared_constant_pool
3566 : crtl
->varasm
.pool
);
3568 /* Lookup the value in the hashtable. */
3571 hash
= const_rtx_hash (x
);
3572 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3573 desc
= (struct constant_descriptor_rtx
*) *slot
;
3575 /* If the constant was already present, return its memory. */
3577 return copy_rtx (desc
->mem
);
3579 /* Otherwise, create a new descriptor. */
3580 desc
= GGC_NEW (struct constant_descriptor_rtx
);
3583 /* Align the location counter as required by EXP's data type. */
3584 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3585 #ifdef CONSTANT_ALIGNMENT
3587 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3588 if (type
!= NULL_TREE
)
3589 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3593 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3594 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3597 desc
->constant
= tmp
.constant
;
3598 desc
->offset
= pool
->offset
;
3601 desc
->align
= align
;
3602 desc
->labelno
= const_labelno
;
3605 pool
->offset
+= GET_MODE_SIZE (mode
);
3607 pool
->last
->next
= desc
;
3609 pool
->first
= pool
->last
= desc
;
3612 /* Create a string containing the label name, in LABEL. */
3613 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3616 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3617 the constants pool. */
3618 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3620 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3621 symbol
= create_block_symbol (ggc_strdup (label
),
3622 get_block_for_section (sect
), -1);
3625 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3627 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3628 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3629 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3631 /* Construct the MEM. */
3632 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3633 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3634 set_mem_align (def
, align
);
3636 /* If we're dropping a label to the constant pool, make sure we
3638 if (GET_CODE (x
) == LABEL_REF
)
3639 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3641 return copy_rtx (def
);
3644 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3647 get_pool_constant (rtx addr
)
3649 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3652 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3653 and whether it has been output or not. */
3656 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3658 struct constant_descriptor_rtx
*desc
;
3660 desc
= SYMBOL_REF_CONSTANT (addr
);
3661 *pmarked
= (desc
->mark
!= 0);
3662 return desc
->constant
;
3665 /* Similar, return the mode. */
3668 get_pool_mode (const_rtx addr
)
3670 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3673 /* Return the size of the constant pool. */
3676 get_pool_size (void)
3678 return crtl
->varasm
.pool
->offset
;
3681 /* Worker function for output_constant_pool_1. Emit assembly for X
3682 in MODE with known alignment ALIGN. */
3685 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3687 switch (GET_MODE_CLASS (mode
))
3690 case MODE_DECIMAL_FLOAT
:
3694 gcc_assert (GET_CODE (x
) == CONST_DOUBLE
);
3695 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3696 assemble_real (r
, mode
, align
);
3701 case MODE_PARTIAL_INT
:
3706 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3709 case MODE_VECTOR_FLOAT
:
3710 case MODE_VECTOR_INT
:
3711 case MODE_VECTOR_FRACT
:
3712 case MODE_VECTOR_UFRACT
:
3713 case MODE_VECTOR_ACCUM
:
3714 case MODE_VECTOR_UACCUM
:
3717 enum machine_mode submode
= GET_MODE_INNER (mode
);
3718 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3720 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3721 units
= CONST_VECTOR_NUNITS (x
);
3723 for (i
= 0; i
< units
; i
++)
3725 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3726 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3736 /* Worker function for output_constant_pool. Emit constant DESC,
3737 giving it ALIGN bits of alignment. */
3740 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3747 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3748 whose CODE_LABEL has been deleted. This can occur if a jump table
3749 is eliminated by optimization. If so, write a constant of zero
3750 instead. Note that this can also happen by turning the
3751 CODE_LABEL into a NOTE. */
3752 /* ??? This seems completely and utterly wrong. Certainly it's
3753 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3754 functioning even with INSN_DELETED_P and friends. */
3757 switch (GET_CODE (tmp
))
3760 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3761 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3763 tmp
= XEXP (XEXP (tmp
, 0), 0);
3767 tmp
= XEXP (tmp
, 0);
3768 gcc_assert (!INSN_DELETED_P (tmp
));
3769 gcc_assert (!NOTE_P (tmp
)
3770 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3777 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3778 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3779 align
, desc
->labelno
, done
);
3782 assemble_align (align
);
3784 /* Output the label. */
3785 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3787 /* Output the data. */
3788 output_constant_pool_2 (desc
->mode
, x
, align
);
3790 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3791 sections have proper size. */
3792 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3794 && (in_section
->common
.flags
& SECTION_MERGE
))
3795 assemble_align (align
);
3797 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3803 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3804 to as used. Emit referenced deferred strings. This function can
3805 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3808 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3810 rtx x
= *current_rtx
;
3812 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3815 if (CONSTANT_POOL_ADDRESS_P (x
))
3817 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3818 if (desc
->mark
== 0)
3821 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3824 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3826 tree exp
= SYMBOL_REF_DECL (x
);
3827 if (!TREE_ASM_WRITTEN (exp
))
3829 n_deferred_constants
--;
3830 output_constant_def_contents (x
);
3837 /* Look through appropriate parts of INSN, marking all entries in the
3838 constant pool which are actually being used. Entries that are only
3839 referenced by other constants are also marked as used. Emit
3840 deferred strings that are used. */
3843 mark_constants (rtx insn
)
3848 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3849 insns, not any notes that may be attached. We don't want to mark
3850 a constant just because it happens to appear in a REG_EQUIV note. */
3851 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3853 rtx seq
= PATTERN (insn
);
3854 int i
, n
= XVECLEN (seq
, 0);
3855 for (i
= 0; i
< n
; ++i
)
3857 rtx subinsn
= XVECEXP (seq
, 0, i
);
3858 if (INSN_P (subinsn
))
3859 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3863 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3866 /* Look through the instructions for this function, and mark all the
3867 entries in POOL which are actually being used. Emit deferred constants
3868 which have indeed been used. */
3871 mark_constant_pool (void)
3875 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3878 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3879 mark_constants (insn
);
3881 for (link
= crtl
->epilogue_delay_list
;
3883 link
= XEXP (link
, 1))
3884 mark_constants (XEXP (link
, 0));
3887 /* Write all the constants in POOL. */
3890 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3892 struct constant_descriptor_rtx
*desc
;
3894 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3897 /* If the constant is part of an object_block, make sure that
3898 the constant has been positioned within its block, but do not
3899 write out its definition yet. output_object_blocks will do
3901 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3902 && SYMBOL_REF_BLOCK (desc
->sym
))
3903 place_block_symbol (desc
->sym
);
3906 switch_to_section (targetm
.asm_out
.select_rtx_section
3907 (desc
->mode
, desc
->constant
, desc
->align
));
3908 output_constant_pool_1 (desc
, desc
->align
);
3913 /* Mark all constants that are used in the current function, then write
3914 out the function's private constant pool. */
3917 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3918 tree fndecl ATTRIBUTE_UNUSED
)
3920 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3922 /* It is possible for gcc to call force_const_mem and then to later
3923 discard the instructions which refer to the constant. In such a
3924 case we do not need to output the constant. */
3925 mark_constant_pool ();
3927 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3928 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3931 output_constant_pool_contents (pool
);
3933 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3934 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3938 /* Write the contents of the shared constant pool. */
3941 output_shared_constant_pool (void)
3943 output_constant_pool_contents (shared_constant_pool
);
3946 /* Determine what kind of relocations EXP may need. */
3949 compute_reloc_for_constant (tree exp
)
3951 int reloc
= 0, reloc2
;
3954 switch (TREE_CODE (exp
))
3958 /* Go inside any operations that get_inner_reference can handle and see
3959 if what's inside is a constant: no need to do anything here for
3960 addresses of variables or functions. */
3961 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3962 tem
= TREE_OPERAND (tem
, 0))
3965 if (TREE_PUBLIC (tem
))
3972 case POINTER_PLUS_EXPR
:
3973 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3974 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3978 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3979 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3980 /* The difference of two local labels is computable at link time. */
3981 if (reloc
== 1 && reloc2
== 1)
3988 case VIEW_CONVERT_EXPR
:
3989 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3994 unsigned HOST_WIDE_INT idx
;
3995 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3997 reloc
|= compute_reloc_for_constant (tem
);
4007 /* Find all the constants whose addresses are referenced inside of EXP,
4008 and make sure assembler code with a label has been output for each one.
4009 Indicate whether an ADDR_EXPR has been encountered. */
4012 output_addressed_constants (tree exp
)
4016 switch (TREE_CODE (exp
))
4020 /* Go inside any operations that get_inner_reference can handle and see
4021 if what's inside is a constant: no need to do anything here for
4022 addresses of variables or functions. */
4023 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4024 tem
= TREE_OPERAND (tem
, 0))
4027 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4028 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4029 tem
= DECL_INITIAL (tem
);
4031 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4032 output_constant_def (tem
, 0);
4036 case POINTER_PLUS_EXPR
:
4038 output_addressed_constants (TREE_OPERAND (exp
, 1));
4042 case VIEW_CONVERT_EXPR
:
4043 output_addressed_constants (TREE_OPERAND (exp
, 0));
4048 unsigned HOST_WIDE_INT idx
;
4049 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4051 output_addressed_constants (tem
);
4060 /* Whether a constructor CTOR is a valid static constant initializer if all
4061 its elements are. This used to be internal to initializer_constant_valid_p
4062 and has been exposed to let other functions like categorize_ctor_elements
4063 evaluate the property while walking a constructor for other purposes. */
4066 constructor_static_from_elts_p (const_tree ctor
)
4068 return (TREE_CONSTANT (ctor
)
4069 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4070 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
)
4071 && !VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (ctor
)));
4074 /* A subroutine of initializer_constant_valid_p. VALUE is either a
4075 MINUS_EXPR or a POINTER_PLUS_EXPR. This looks for cases of VALUE
4076 which are valid when ENDTYPE is an integer of any size; in
4077 particular, this does not accept a pointer minus a constant. This
4078 returns null_pointer_node if the VALUE is an absolute constant
4079 which can be used to initialize a static variable. Otherwise it
4083 narrowing_initializer_constant_valid_p (tree value
, tree endtype
)
4087 if (!INTEGRAL_TYPE_P (endtype
))
4090 op0
= TREE_OPERAND (value
, 0);
4091 op1
= TREE_OPERAND (value
, 1);
4093 /* Like STRIP_NOPS except allow the operand mode to widen. This
4094 works around a feature of fold that simplifies (int)(p1 - p2) to
4095 ((int)p1 - (int)p2) under the theory that the narrower operation
4098 while (CONVERT_EXPR_P (op0
)
4099 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4101 tree inner
= TREE_OPERAND (op0
, 0);
4102 if (inner
== error_mark_node
4103 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4104 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4105 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4110 while (CONVERT_EXPR_P (op1
)
4111 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4113 tree inner
= TREE_OPERAND (op1
, 0);
4114 if (inner
== error_mark_node
4115 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4116 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4117 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4122 op0
= initializer_constant_valid_p (op0
, endtype
);
4123 op1
= initializer_constant_valid_p (op1
, endtype
);
4125 /* Both initializers must be known. */
4129 return null_pointer_node
;
4131 /* Support differences between labels. */
4132 if (TREE_CODE (op0
) == LABEL_DECL
4133 && TREE_CODE (op1
) == LABEL_DECL
)
4134 return null_pointer_node
;
4136 if (TREE_CODE (op0
) == STRING_CST
4137 && TREE_CODE (op1
) == STRING_CST
4138 && operand_equal_p (op0
, op1
, 1))
4139 return null_pointer_node
;
4145 /* Return nonzero if VALUE is a valid constant-valued expression
4146 for use in initializing a static variable; one that can be an
4147 element of a "constant" initializer.
4149 Return null_pointer_node if the value is absolute;
4150 if it is relocatable, return the variable that determines the relocation.
4151 We assume that VALUE has been folded as much as possible;
4152 therefore, we do not need to check for such things as
4153 arithmetic-combinations of integers. */
4156 initializer_constant_valid_p (tree value
, tree endtype
)
4160 switch (TREE_CODE (value
))
4163 if (constructor_static_from_elts_p (value
))
4165 unsigned HOST_WIDE_INT idx
;
4167 bool absolute
= true;
4169 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4172 reloc
= initializer_constant_valid_p (elt
, TREE_TYPE (elt
));
4175 if (reloc
!= null_pointer_node
)
4178 /* For a non-absolute relocation, there is no single
4179 variable that can be "the variable that determines the
4181 return absolute
? null_pointer_node
: error_mark_node
;
4184 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4192 return null_pointer_node
;
4197 tree op0
= staticp (TREE_OPERAND (value
, 0));
4200 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4201 to be a constant, this is old-skool offsetof-like nonsense. */
4202 if (TREE_CODE (op0
) == INDIRECT_REF
4203 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4204 return null_pointer_node
;
4205 /* Taking the address of a nested function involves a trampoline,
4206 unless we don't need or want one. */
4207 if (TREE_CODE (op0
) == FUNCTION_DECL
4208 && decl_function_context (op0
)
4209 && !DECL_NO_STATIC_CHAIN (op0
)
4210 && !TREE_NO_TRAMPOLINE (value
))
4212 /* "&{...}" requires a temporary to hold the constructed
4214 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4220 case NON_LVALUE_EXPR
:
4221 return initializer_constant_valid_p (TREE_OPERAND (value
, 0), endtype
);
4223 case VIEW_CONVERT_EXPR
:
4225 tree src
= TREE_OPERAND (value
, 0);
4226 tree src_type
= TREE_TYPE (src
);
4227 tree dest_type
= TREE_TYPE (value
);
4229 /* Allow view-conversions from aggregate to non-aggregate type only
4230 if the bit pattern is fully preserved afterwards; otherwise, the
4231 RTL expander won't be able to apply a subsequent transformation
4232 to the underlying constructor. */
4233 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4235 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4236 return initializer_constant_valid_p (src
, endtype
);
4241 /* Allow all other kinds of view-conversion. */
4242 return initializer_constant_valid_p (src
, endtype
);
4247 tree src
= TREE_OPERAND (value
, 0);
4248 tree src_type
= TREE_TYPE (src
);
4249 tree dest_type
= TREE_TYPE (value
);
4251 /* Allow conversions between pointer types, floating-point
4252 types, and offset types. */
4253 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4254 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4255 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4256 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4257 return initializer_constant_valid_p (src
, endtype
);
4259 /* Allow length-preserving conversions between integer types. */
4260 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4261 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4262 return initializer_constant_valid_p (src
, endtype
);
4264 /* Allow conversions between other integer types only if
4266 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4268 tree inner
= initializer_constant_valid_p (src
, endtype
);
4269 if (inner
== null_pointer_node
)
4270 return null_pointer_node
;
4274 /* Allow (int) &foo provided int is as wide as a pointer. */
4275 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4276 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4277 return initializer_constant_valid_p (src
, endtype
);
4279 /* Likewise conversions from int to pointers, but also allow
4280 conversions from 0. */
4281 if ((POINTER_TYPE_P (dest_type
)
4282 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4283 && INTEGRAL_TYPE_P (src_type
))
4285 if (TREE_CODE (src
) == INTEGER_CST
4286 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4287 return null_pointer_node
;
4288 if (integer_zerop (src
))
4289 return null_pointer_node
;
4290 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4291 return initializer_constant_valid_p (src
, endtype
);
4294 /* Allow conversions to struct or union types if the value
4296 if (TREE_CODE (dest_type
) == RECORD_TYPE
4297 || TREE_CODE (dest_type
) == UNION_TYPE
)
4298 return initializer_constant_valid_p (src
, endtype
);
4302 case POINTER_PLUS_EXPR
:
4304 if (! INTEGRAL_TYPE_P (endtype
)
4305 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4307 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4309 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4311 /* If either term is absolute, use the other term's relocation. */
4312 if (valid0
== null_pointer_node
)
4314 if (valid1
== null_pointer_node
)
4318 /* Support narrowing pointer differences. */
4319 ret
= narrowing_initializer_constant_valid_p (value
, endtype
);
4320 if (ret
!= NULL_TREE
)
4326 if (! INTEGRAL_TYPE_P (endtype
)
4327 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4329 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4331 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4333 /* Win if second argument is absolute. */
4334 if (valid1
== null_pointer_node
)
4336 /* Win if both arguments have the same relocation.
4337 Then the value is absolute. */
4338 if (valid0
== valid1
&& valid0
!= 0)
4339 return null_pointer_node
;
4341 /* Since GCC guarantees that string constants are unique in the
4342 generated code, a subtraction between two copies of the same
4343 constant string is absolute. */
4344 if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4345 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4346 && operand_equal_p (valid0
, valid1
, 1))
4347 return null_pointer_node
;
4350 /* Support narrowing differences. */
4351 ret
= narrowing_initializer_constant_valid_p (value
, endtype
);
4352 if (ret
!= NULL_TREE
)
4364 /* Output assembler code for constant EXP to FILE, with no label.
4365 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4366 Assumes output_addressed_constants has been done on EXP already.
4368 Generate exactly SIZE bytes of assembler data, padding at the end
4369 with zeros if necessary. SIZE must always be specified.
4371 SIZE is important for structure constructors,
4372 since trailing members may have been omitted from the constructor.
4373 It is also important for initialization of arrays from string constants
4374 since the full length of the string constant might not be wanted.
4375 It is also needed for initialization of unions, where the initializer's
4376 type is just one member, and that may not be as long as the union.
4378 There a case in which we would fail to output exactly SIZE bytes:
4379 for a structure constructor that wants to produce more than SIZE bytes.
4380 But such constructors will never be generated for any possible input.
4382 ALIGN is the alignment of the data in bits. */
4385 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4387 enum tree_code code
;
4388 unsigned HOST_WIDE_INT thissize
;
4390 if (size
== 0 || flag_syntax_only
)
4393 /* See if we're trying to initialize a pointer in a non-default mode
4394 to the address of some declaration somewhere. If the target says
4395 the mode is valid for pointers, assume the target has a way of
4397 if (TREE_CODE (exp
) == NOP_EXPR
4398 && POINTER_TYPE_P (TREE_TYPE (exp
))
4399 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4401 tree saved_type
= TREE_TYPE (exp
);
4403 /* Peel off any intermediate conversions-to-pointer for valid
4405 while (TREE_CODE (exp
) == NOP_EXPR
4406 && POINTER_TYPE_P (TREE_TYPE (exp
))
4407 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4408 exp
= TREE_OPERAND (exp
, 0);
4410 /* If what we're left with is the address of something, we can
4411 convert the address to the final type and output it that
4413 if (TREE_CODE (exp
) == ADDR_EXPR
)
4414 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4415 /* Likewise for constant ints. */
4416 else if (TREE_CODE (exp
) == INTEGER_CST
)
4417 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4418 TREE_INT_CST_HIGH (exp
));
4422 /* Eliminate any conversions since we'll be outputting the underlying
4424 while (CONVERT_EXPR_P (exp
)
4425 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4426 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4428 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4429 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4431 /* Make sure eliminating the conversion is really a no-op, except with
4432 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4433 union types to allow for Ada unchecked unions. */
4434 if (type_size
> op_size
4435 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4436 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4437 /* Keep the conversion. */
4440 exp
= TREE_OPERAND (exp
, 0);
4443 code
= TREE_CODE (TREE_TYPE (exp
));
4444 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4446 /* Allow a constructor with no elements for any data type.
4447 This means to fill the space with zeros. */
4448 if (TREE_CODE (exp
) == CONSTRUCTOR
4449 && VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (exp
)))
4451 assemble_zeros (size
);
4455 if (TREE_CODE (exp
) == FDESC_EXPR
)
4457 #ifdef ASM_OUTPUT_FDESC
4458 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4459 tree decl
= TREE_OPERAND (exp
, 0);
4460 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4467 /* Now output the underlying data. If we've handling the padding, return.
4468 Otherwise, break and ensure SIZE is the size written. */
4475 case REFERENCE_TYPE
:
4477 case FIXED_POINT_TYPE
:
4478 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4479 EXPAND_INITIALIZER
),
4480 MIN (size
, thissize
), align
, 0))
4481 error ("initializer for integer/fixed-point value is too complicated");
4485 if (TREE_CODE (exp
) != REAL_CST
)
4486 error ("initializer for floating value is not a floating constant");
4488 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4492 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4493 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4494 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4499 switch (TREE_CODE (exp
))
4502 output_constructor (exp
, size
, align
);
4505 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4507 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4514 unsigned int nalign
;
4515 enum machine_mode inner
;
4517 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4518 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4520 elt_size
= GET_MODE_SIZE (inner
);
4522 link
= TREE_VECTOR_CST_ELTS (exp
);
4523 output_constant (TREE_VALUE (link
), elt_size
, align
);
4524 thissize
= elt_size
;
4525 while ((link
= TREE_CHAIN (link
)) != NULL
)
4527 output_constant (TREE_VALUE (link
), elt_size
, nalign
);
4528 thissize
+= elt_size
;
4539 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4540 output_constructor (exp
, size
, align
);
4550 if (size
> thissize
)
4551 assemble_zeros (size
- thissize
);
4555 /* Subroutine of output_constructor, used for computing the size of
4556 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4557 type with an unspecified upper bound. */
4559 static unsigned HOST_WIDE_INT
4560 array_size_for_constructor (tree val
)
4563 unsigned HOST_WIDE_INT cnt
;
4564 tree index
, value
, tmp
;
4566 /* This code used to attempt to handle string constants that are not
4567 arrays of single-bytes, but nothing else does, so there's no point in
4569 if (TREE_CODE (val
) == STRING_CST
)
4570 return TREE_STRING_LENGTH (val
);
4572 max_index
= NULL_TREE
;
4573 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4575 if (TREE_CODE (index
) == RANGE_EXPR
)
4576 index
= TREE_OPERAND (index
, 1);
4577 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4581 if (max_index
== NULL_TREE
)
4584 /* Compute the total number of array elements. */
4585 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4586 i
= size_binop (MINUS_EXPR
, fold_convert (sizetype
, max_index
),
4587 fold_convert (sizetype
, tmp
));
4588 i
= size_binop (PLUS_EXPR
, i
, build_int_cst (sizetype
, 1));
4590 /* Multiply by the array element unit size to find number of bytes. */
4591 i
= size_binop (MULT_EXPR
, i
, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4593 return tree_low_cst (i
, 1);
4596 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4597 Generate at least SIZE bytes, padding if necessary. */
4600 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
4603 tree type
= TREE_TYPE (exp
);
4606 /* Number of bytes output or skipped so far.
4607 In other words, current position within the constructor. */
4608 HOST_WIDE_INT total_bytes
= 0;
4609 /* Nonzero means BYTE contains part of a byte, to be output. */
4610 int byte_buffer_in_use
= 0;
4612 unsigned HOST_WIDE_INT cnt
;
4613 constructor_elt
*ce
;
4615 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
4617 if (TREE_CODE (type
) == RECORD_TYPE
)
4618 field
= TYPE_FIELDS (type
);
4620 if (TREE_CODE (type
) == ARRAY_TYPE
4621 && TYPE_DOMAIN (type
) != 0)
4622 min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (type
));
4624 /* As LINK goes through the elements of the constant,
4625 FIELD goes through the structure fields, if the constant is a structure.
4626 if the constant is a union, then we override this,
4627 by getting the field from the TREE_LIST element.
4628 But the constant could also be an array. Then FIELD is zero.
4630 There is always a maximum of one element in the chain LINK for unions
4631 (even if the initializer in a source program incorrectly contains
4634 VEC_iterate (constructor_elt
, CONSTRUCTOR_ELTS (exp
), cnt
, ce
);
4635 cnt
++, field
= field
? TREE_CHAIN (field
) : 0)
4637 tree val
= ce
->value
;
4640 /* The element in a union constructor specifies the proper field
4642 if ((TREE_CODE (type
) == RECORD_TYPE
|| TREE_CODE (type
) == UNION_TYPE
4643 || TREE_CODE (type
) == QUAL_UNION_TYPE
)
4647 else if (TREE_CODE (type
) == ARRAY_TYPE
)
4650 #ifdef ASM_COMMENT_START
4651 if (field
&& flag_verbose_asm
)
4652 fprintf (asm_out_file
, "%s %s:\n",
4655 ? IDENTIFIER_POINTER (DECL_NAME (field
))
4659 /* Eliminate the marker that makes a cast not be an lvalue. */
4663 if (index
&& TREE_CODE (index
) == RANGE_EXPR
)
4665 unsigned HOST_WIDE_INT fieldsize
4666 = int_size_in_bytes (TREE_TYPE (type
));
4667 HOST_WIDE_INT lo_index
= tree_low_cst (TREE_OPERAND (index
, 0), 0);
4668 HOST_WIDE_INT hi_index
= tree_low_cst (TREE_OPERAND (index
, 1), 0);
4669 HOST_WIDE_INT index
;
4670 unsigned int align2
= min_align (align
, fieldsize
* BITS_PER_UNIT
);
4672 for (index
= lo_index
; index
<= hi_index
; index
++)
4674 /* Output the element's initial value. */
4676 assemble_zeros (fieldsize
);
4678 output_constant (val
, fieldsize
, align2
);
4680 /* Count its size. */
4681 total_bytes
+= fieldsize
;
4684 else if (field
== 0 || !DECL_BIT_FIELD (field
))
4686 /* An element that is not a bit-field. */
4688 unsigned HOST_WIDE_INT fieldsize
;
4689 /* Since this structure is static,
4690 we know the positions are constant. */
4691 HOST_WIDE_INT pos
= field
? int_byte_position (field
) : 0;
4692 unsigned int align2
;
4695 pos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val
)), 1)
4696 * (tree_low_cst (index
, 0) - tree_low_cst (min_index
, 0)));
4698 /* Output any buffered-up bit-fields preceding this element. */
4699 if (byte_buffer_in_use
)
4701 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4703 byte_buffer_in_use
= 0;
4706 /* Advance to offset of this element.
4707 Note no alignment needed in an array, since that is guaranteed
4708 if each element has the proper size. */
4709 if ((field
!= 0 || index
!= 0) && pos
!= total_bytes
)
4711 gcc_assert (pos
>= total_bytes
);
4712 assemble_zeros (pos
- total_bytes
);
4716 /* Find the alignment of this element. */
4717 align2
= min_align (align
, BITS_PER_UNIT
* pos
);
4719 /* Determine size this element should occupy. */
4724 /* If this is an array with an unspecified upper bound,
4725 the initializer determines the size. */
4726 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4727 but we cannot do this until the deprecated support for
4728 initializing zero-length array members is removed. */
4729 if (TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
4730 && TYPE_DOMAIN (TREE_TYPE (field
))
4731 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field
))))
4733 fieldsize
= array_size_for_constructor (val
);
4734 /* Given a non-empty initialization, this field had
4736 gcc_assert (!fieldsize
|| !TREE_CHAIN (field
));
4738 else if (DECL_SIZE_UNIT (field
))
4740 /* ??? This can't be right. If the decl size overflows
4741 a host integer we will silently emit no data. */
4742 if (host_integerp (DECL_SIZE_UNIT (field
), 1))
4743 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (field
), 1);
4747 fieldsize
= int_size_in_bytes (TREE_TYPE (type
));
4749 /* Output the element's initial value. */
4751 assemble_zeros (fieldsize
);
4753 output_constant (val
, fieldsize
, align2
);
4755 /* Count its size. */
4756 total_bytes
+= fieldsize
;
4758 else if (val
!= 0 && TREE_CODE (val
) != INTEGER_CST
)
4759 error ("invalid initial value for member %qs",
4760 IDENTIFIER_POINTER (DECL_NAME (field
)));
4763 /* Element that is a bit-field. */
4765 HOST_WIDE_INT next_offset
= int_bit_position (field
);
4766 HOST_WIDE_INT end_offset
4767 = (next_offset
+ tree_low_cst (DECL_SIZE (field
), 1));
4770 val
= integer_zero_node
;
4772 /* If this field does not start in this (or, next) byte,
4774 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4776 /* Output remnant of any bit field in previous bytes. */
4777 if (byte_buffer_in_use
)
4779 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4781 byte_buffer_in_use
= 0;
4784 /* If still not at proper byte, advance to there. */
4785 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4787 gcc_assert (next_offset
/ BITS_PER_UNIT
>= total_bytes
);
4788 assemble_zeros (next_offset
/ BITS_PER_UNIT
- total_bytes
);
4789 total_bytes
= next_offset
/ BITS_PER_UNIT
;
4793 if (! byte_buffer_in_use
)
4796 /* We must split the element into pieces that fall within
4797 separate bytes, and combine each byte with previous or
4798 following bit-fields. */
4800 /* next_offset is the offset n fbits from the beginning of
4801 the structure to the next bit of this element to be processed.
4802 end_offset is the offset of the first bit past the end of
4804 while (next_offset
< end_offset
)
4808 HOST_WIDE_INT value
;
4809 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4810 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4812 /* Advance from byte to byte
4813 within this element when necessary. */
4814 while (next_byte
!= total_bytes
)
4816 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4821 /* Number of bits we can process at once
4822 (all part of the same byte). */
4823 this_time
= MIN (end_offset
- next_offset
,
4824 BITS_PER_UNIT
- next_bit
);
4825 if (BYTES_BIG_ENDIAN
)
4827 /* On big-endian machine, take the most significant bits
4828 first (of the bits that are significant)
4829 and put them into bytes from the most significant end. */
4830 shift
= end_offset
- next_offset
- this_time
;
4832 /* Don't try to take a bunch of bits that cross
4833 the word boundary in the INTEGER_CST. We can
4834 only select bits from the LOW or HIGH part
4836 if (shift
< HOST_BITS_PER_WIDE_INT
4837 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4839 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4840 shift
= HOST_BITS_PER_WIDE_INT
;
4843 /* Now get the bits from the appropriate constant word. */
4844 if (shift
< HOST_BITS_PER_WIDE_INT
)
4845 value
= TREE_INT_CST_LOW (val
);
4848 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4849 value
= TREE_INT_CST_HIGH (val
);
4850 shift
-= HOST_BITS_PER_WIDE_INT
;
4853 /* Get the result. This works only when:
4854 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4855 byte
|= (((value
>> shift
)
4856 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4857 << (BITS_PER_UNIT
- this_time
- next_bit
));
4861 /* On little-endian machines,
4862 take first the least significant bits of the value
4863 and pack them starting at the least significant
4864 bits of the bytes. */
4865 shift
= next_offset
- int_bit_position (field
);
4867 /* Don't try to take a bunch of bits that cross
4868 the word boundary in the INTEGER_CST. We can
4869 only select bits from the LOW or HIGH part
4871 if (shift
< HOST_BITS_PER_WIDE_INT
4872 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4873 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
4875 /* Now get the bits from the appropriate constant word. */
4876 if (shift
< HOST_BITS_PER_WIDE_INT
)
4877 value
= TREE_INT_CST_LOW (val
);
4880 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4881 value
= TREE_INT_CST_HIGH (val
);
4882 shift
-= HOST_BITS_PER_WIDE_INT
;
4885 /* Get the result. This works only when:
4886 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4887 byte
|= (((value
>> shift
)
4888 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4892 next_offset
+= this_time
;
4893 byte_buffer_in_use
= 1;
4898 if (byte_buffer_in_use
)
4900 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4904 if ((unsigned HOST_WIDE_INT
)total_bytes
< size
)
4905 assemble_zeros (size
- total_bytes
);
4908 /* Mark DECL as weak. */
4911 mark_weak (tree decl
)
4913 DECL_WEAK (decl
) = 1;
4915 if (DECL_RTL_SET_P (decl
)
4916 && MEM_P (DECL_RTL (decl
))
4917 && XEXP (DECL_RTL (decl
), 0)
4918 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
4919 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
4922 /* Merge weak status between NEWDECL and OLDDECL. */
4925 merge_weak (tree newdecl
, tree olddecl
)
4927 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
4929 if (DECL_WEAK (newdecl
) && SUPPORTS_WEAK
)
4932 /* We put the NEWDECL on the weak_decls list at some point
4933 and OLDDECL as well. Keep just OLDDECL on the list. */
4934 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
4935 if (TREE_VALUE (*pwd
) == newdecl
)
4937 *pwd
= TREE_CHAIN (*pwd
);
4944 if (DECL_WEAK (newdecl
))
4948 /* NEWDECL is weak, but OLDDECL is not. */
4950 /* If we already output the OLDDECL, we're in trouble; we can't
4951 go back and make it weak. This error cannot be caught in
4952 declare_weak because the NEWDECL and OLDDECL was not yet
4953 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4954 if (TREE_ASM_WRITTEN (olddecl
))
4955 error ("weak declaration of %q+D must precede definition",
4958 /* If we've already generated rtl referencing OLDDECL, we may
4959 have done so in a way that will not function properly with
4961 else if (TREE_USED (olddecl
)
4962 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)))
4963 warning (0, "weak declaration of %q+D after first use results "
4964 "in unspecified behavior", newdecl
);
4968 /* We put the NEWDECL on the weak_decls list at some point.
4969 Replace it with the OLDDECL. */
4970 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
4971 if (TREE_VALUE (wd
) == newdecl
)
4973 TREE_VALUE (wd
) = olddecl
;
4976 /* We may not find the entry on the list. If NEWDECL is a
4977 weak alias, then we will have already called
4978 globalize_decl to remove the entry; in that case, we do
4979 not need to do anything. */
4982 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4983 mark_weak (olddecl
);
4986 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4987 weak. Just update NEWDECL to indicate that it's weak too. */
4988 mark_weak (newdecl
);
4991 /* Declare DECL to be a weak symbol. */
4994 declare_weak (tree decl
)
4996 if (! TREE_PUBLIC (decl
))
4997 error ("weak declaration of %q+D must be public", decl
);
4998 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& TREE_ASM_WRITTEN (decl
))
4999 error ("weak declaration of %q+D must precede definition", decl
);
5000 else if (!SUPPORTS_WEAK
)
5001 warning (0, "weak declaration of %q+D not supported", decl
);
5007 weak_finish_1 (tree decl
)
5009 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5010 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5013 if (! TREE_USED (decl
))
5016 #ifdef ASM_WEAKEN_DECL
5017 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5019 #ifdef ASM_WEAKEN_LABEL
5020 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5022 #ifdef ASM_OUTPUT_WEAK_ALIAS
5024 static bool warn_once
= 0;
5027 warning (0, "only weak aliases are supported in this configuration");
5037 /* This TREE_LIST contains weakref targets. */
5039 static GTY(()) tree weakref_targets
;
5041 /* Forward declaration. */
5042 static tree
find_decl_and_mark_needed (tree decl
, tree target
);
5044 /* Emit any pending weak declarations. */
5051 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5053 tree alias_decl
= TREE_PURPOSE (t
);
5054 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5056 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5057 /* Remove alias_decl from the weak list, but leave entries for
5058 the target alone. */
5060 #ifndef ASM_OUTPUT_WEAKREF
5061 else if (! TREE_SYMBOL_REFERENCED (target
))
5063 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5064 defined, otherwise we and weak_finish_1 would use
5065 different macros. */
5066 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5067 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5069 tree decl
= find_decl_and_mark_needed (alias_decl
, target
);
5073 decl
= build_decl (TREE_CODE (alias_decl
), target
,
5074 TREE_TYPE (alias_decl
));
5076 DECL_EXTERNAL (decl
) = 1;
5077 TREE_PUBLIC (decl
) = 1;
5078 DECL_ARTIFICIAL (decl
) = 1;
5079 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5080 TREE_USED (decl
) = 1;
5083 weak_finish_1 (decl
);
5092 /* Remove the alias and the target from the pending weak list
5093 so that we do not emit any .weak directives for the former,
5094 nor multiple .weak directives for the latter. */
5095 for (p
= &weak_decls
; (t2
= *p
) ; )
5097 if (TREE_VALUE (t2
) == alias_decl
5098 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5099 *p
= TREE_CHAIN (t2
);
5101 p
= &TREE_CHAIN (t2
);
5104 /* Remove other weakrefs to the same target, to speed things up. */
5105 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5107 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5108 *p
= TREE_CHAIN (t2
);
5110 p
= &TREE_CHAIN (t2
);
5115 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5117 tree decl
= TREE_VALUE (t
);
5119 weak_finish_1 (decl
);
5123 /* Emit the assembly bits to indicate that DECL is globally visible. */
5126 globalize_decl (tree decl
)
5129 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5130 if (DECL_WEAK (decl
))
5132 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5135 #ifdef ASM_WEAKEN_DECL
5136 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5138 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5141 /* Remove this function from the pending weak list so that
5142 we do not emit multiple .weak directives for it. */
5143 for (p
= &weak_decls
; (t
= *p
) ; )
5145 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5146 *p
= TREE_CHAIN (t
);
5148 p
= &TREE_CHAIN (t
);
5151 /* Remove weakrefs to the same target from the pending weakref
5152 list, for the same reason. */
5153 for (p
= &weakref_targets
; (t
= *p
) ; )
5155 if (DECL_ASSEMBLER_NAME (decl
)
5156 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5157 *p
= TREE_CHAIN (t
);
5159 p
= &TREE_CHAIN (t
);
5166 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5169 /* We have to be able to tell cgraph about the needed-ness of the target
5170 of an alias. This requires that the decl have been defined. Aliases
5171 that precede their definition have to be queued for later processing. */
5173 typedef struct alias_pair
GTY(())
5179 /* Define gc'd vector type. */
5180 DEF_VEC_O(alias_pair
);
5181 DEF_VEC_ALLOC_O(alias_pair
,gc
);
5183 static GTY(()) VEC(alias_pair
,gc
) *alias_pairs
;
5185 /* Given an assembly name, find the decl it is associated with. At the
5186 same time, mark it needed for cgraph. */
5189 find_decl_and_mark_needed (tree decl
, tree target
)
5191 struct cgraph_node
*fnode
= NULL
;
5192 struct varpool_node
*vnode
= NULL
;
5194 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5196 fnode
= cgraph_node_for_asm (target
);
5198 vnode
= varpool_node_for_asm (target
);
5202 vnode
= varpool_node_for_asm (target
);
5204 fnode
= cgraph_node_for_asm (target
);
5209 /* We can't mark function nodes as used after cgraph global info
5210 is finished. This wouldn't generally be necessary, but C++
5211 virtual table thunks are introduced late in the game and
5212 might seem like they need marking, although in fact they
5214 if (! cgraph_global_info_ready
)
5215 cgraph_mark_needed_node (fnode
);
5220 varpool_mark_needed_node (vnode
);
5227 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5228 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5229 tree node is DECL to have the value of the tree node TARGET. */
5232 do_assemble_alias (tree decl
, tree target
)
5234 if (TREE_ASM_WRITTEN (decl
))
5237 TREE_ASM_WRITTEN (decl
) = 1;
5238 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5240 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5242 ultimate_transparent_alias_target (&target
);
5244 if (!targetm
.have_tls
5245 && TREE_CODE (decl
) == VAR_DECL
5246 && DECL_THREAD_LOCAL_P (decl
))
5248 decl
= emutls_decl (decl
);
5249 target
= get_emutls_object_name (target
);
5252 if (!TREE_SYMBOL_REFERENCED (target
))
5253 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5255 #ifdef ASM_OUTPUT_WEAKREF
5256 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5257 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5258 IDENTIFIER_POINTER (target
));
5262 error ("%Jweakref is not supported in this configuration", decl
);
5269 if (!targetm
.have_tls
5270 && TREE_CODE (decl
) == VAR_DECL
5271 && DECL_THREAD_LOCAL_P (decl
))
5273 decl
= emutls_decl (decl
);
5274 target
= get_emutls_object_name (target
);
5277 #ifdef ASM_OUTPUT_DEF
5278 /* Make name accessible from other files, if appropriate. */
5280 if (TREE_PUBLIC (decl
))
5282 globalize_decl (decl
);
5283 maybe_assemble_visibility (decl
);
5286 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5287 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5289 ASM_OUTPUT_DEF (asm_out_file
,
5290 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5291 IDENTIFIER_POINTER (target
));
5293 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5298 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5299 # ifdef ASM_WEAKEN_DECL
5300 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5302 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5304 /* Remove this function from the pending weak list so that
5305 we do not emit multiple .weak directives for it. */
5306 for (p
= &weak_decls
; (t
= *p
) ; )
5307 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5308 *p
= TREE_CHAIN (t
);
5310 p
= &TREE_CHAIN (t
);
5312 /* Remove weakrefs to the same target from the pending weakref
5313 list, for the same reason. */
5314 for (p
= &weakref_targets
; (t
= *p
) ; )
5316 if (DECL_ASSEMBLER_NAME (decl
)
5317 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5318 *p
= TREE_CHAIN (t
);
5320 p
= &TREE_CHAIN (t
);
5326 /* First pass of completing pending aliases. Make sure that cgraph knows
5327 which symbols will be required. */
5330 finish_aliases_1 (void)
5335 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5339 target_decl
= find_decl_and_mark_needed (p
->decl
, p
->target
);
5340 if (target_decl
== NULL
)
5342 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5343 error ("%q+D aliased to undefined symbol %qs",
5344 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5346 else if (DECL_EXTERNAL (target_decl
)
5347 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5348 error ("%q+D aliased to external symbol %qs",
5349 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5353 /* Second pass of completing pending aliases. Emit the actual assembly.
5354 This happens at the end of compilation and thus it is assured that the
5355 target symbol has been emitted. */
5358 finish_aliases_2 (void)
5363 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5364 do_assemble_alias (p
->decl
, p
->target
);
5366 VEC_truncate (alias_pair
, alias_pairs
, 0);
5369 /* Emit an assembler directive to make the symbol for DECL an alias to
5370 the symbol for TARGET. */
5373 assemble_alias (tree decl
, tree target
)
5376 bool is_weakref
= false;
5378 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5380 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5384 ultimate_transparent_alias_target (&target
);
5386 if (alias
== target
)
5387 error ("weakref %q+D ultimately targets itself", decl
);
5390 #ifndef ASM_OUTPUT_WEAKREF
5391 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5392 TREE_CHAIN (alias
) = target
;
5395 if (TREE_PUBLIC (decl
))
5396 error ("weakref %q+D must have static linkage", decl
);
5400 #if !defined (ASM_OUTPUT_DEF)
5401 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5402 error ("%Jalias definitions not supported in this configuration", decl
);
5405 if (!DECL_WEAK (decl
))
5407 error ("%Jonly weak aliases are supported in this configuration", decl
);
5414 /* We must force creation of DECL_RTL for debug info generation, even though
5415 we don't use it here. */
5416 make_decl_rtl (decl
);
5417 TREE_USED (decl
) = 1;
5419 /* A quirk of the initial implementation of aliases required that the user
5420 add "extern" to all of them. Which is silly, but now historical. Do
5421 note that the symbol is in fact locally defined. */
5423 DECL_EXTERNAL (decl
) = 0;
5425 /* Allow aliases to aliases. */
5426 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5427 cgraph_node (decl
)->alias
= true;
5429 varpool_node (decl
)->alias
= true;
5431 /* If the target has already been emitted, we don't have to queue the
5432 alias. This saves a tad of memory. */
5433 if (cgraph_global_info_ready
)
5434 target_decl
= find_decl_and_mark_needed (decl
, target
);
5437 if (target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5438 do_assemble_alias (decl
, target
);
5441 alias_pair
*p
= VEC_safe_push (alias_pair
, gc
, alias_pairs
, NULL
);
5447 /* Emit an assembler directive to set symbol for DECL visibility to
5448 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5451 default_assemble_visibility (tree decl
, int vis
)
5453 static const char * const visibility_types
[] = {
5454 NULL
, "protected", "hidden", "internal"
5457 const char *name
, *type
;
5459 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5460 type
= visibility_types
[vis
];
5462 #ifdef HAVE_GAS_HIDDEN
5463 fprintf (asm_out_file
, "\t.%s\t", type
);
5464 assemble_name (asm_out_file
, name
);
5465 fprintf (asm_out_file
, "\n");
5467 warning (OPT_Wattributes
, "visibility attribute not supported "
5468 "in this configuration; ignored");
5472 /* A helper function to call assemble_visibility when needed for a decl. */
5475 maybe_assemble_visibility (tree decl
)
5477 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5479 if (vis
!= VISIBILITY_DEFAULT
)
5481 targetm
.asm_out
.visibility (decl
, vis
);
5488 /* Returns 1 if the target configuration supports defining public symbols
5489 so that one of them will be chosen at link time instead of generating a
5490 multiply-defined symbol error, whether through the use of weak symbols or
5491 a target-specific mechanism for having duplicates discarded. */
5494 supports_one_only (void)
5496 if (SUPPORTS_ONE_ONLY
)
5498 return SUPPORTS_WEAK
;
5501 /* Set up DECL as a public symbol that can be defined in multiple
5502 translation units without generating a linker error. */
5505 make_decl_one_only (tree decl
)
5507 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5508 || TREE_CODE (decl
) == FUNCTION_DECL
);
5510 TREE_PUBLIC (decl
) = 1;
5512 if (SUPPORTS_ONE_ONLY
)
5514 #ifdef MAKE_DECL_ONE_ONLY
5515 MAKE_DECL_ONE_ONLY (decl
);
5517 DECL_ONE_ONLY (decl
) = 1;
5519 else if (TREE_CODE (decl
) == VAR_DECL
5520 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5521 DECL_COMMON (decl
) = 1;
5524 gcc_assert (SUPPORTS_WEAK
);
5525 DECL_WEAK (decl
) = 1;
5530 init_varasm_once (void)
5532 section_htab
= htab_create_ggc (31, section_entry_hash
,
5533 section_entry_eq
, NULL
);
5534 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5535 object_block_entry_eq
, NULL
);
5536 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5537 const_desc_eq
, NULL
);
5539 const_alias_set
= new_alias_set ();
5540 shared_constant_pool
= create_constant_pool ();
5542 #ifdef TEXT_SECTION_ASM_OP
5543 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5544 TEXT_SECTION_ASM_OP
);
5547 #ifdef DATA_SECTION_ASM_OP
5548 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5549 DATA_SECTION_ASM_OP
);
5552 #ifdef SDATA_SECTION_ASM_OP
5553 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5554 SDATA_SECTION_ASM_OP
);
5557 #ifdef READONLY_DATA_SECTION_ASM_OP
5558 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5559 READONLY_DATA_SECTION_ASM_OP
);
5562 #ifdef CTORS_SECTION_ASM_OP
5563 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5564 CTORS_SECTION_ASM_OP
);
5567 #ifdef DTORS_SECTION_ASM_OP
5568 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5569 DTORS_SECTION_ASM_OP
);
5572 #ifdef BSS_SECTION_ASM_OP
5573 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5574 output_section_asm_op
,
5575 BSS_SECTION_ASM_OP
);
5578 #ifdef SBSS_SECTION_ASM_OP
5579 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5580 output_section_asm_op
,
5581 SBSS_SECTION_ASM_OP
);
5584 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5585 | SECTION_COMMON
, emit_tls_common
);
5586 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5587 | SECTION_COMMON
, emit_local
);
5588 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5589 | SECTION_COMMON
, emit_common
);
5591 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5592 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5596 targetm
.asm_out
.init_sections ();
5598 if (readonly_data_section
== NULL
)
5599 readonly_data_section
= text_section
;
5603 decl_default_tls_model (const_tree decl
)
5605 enum tls_model kind
;
5608 is_local
= targetm
.binds_local_p (decl
);
5612 kind
= TLS_MODEL_LOCAL_EXEC
;
5614 kind
= TLS_MODEL_INITIAL_EXEC
;
5617 /* Local dynamic is inefficient when we're not combining the
5618 parts of the address. */
5619 else if (optimize
&& is_local
)
5620 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5622 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5623 if (kind
< flag_tls_default
)
5624 kind
= flag_tls_default
;
5629 /* Select a set of attributes for section NAME based on the properties
5630 of DECL and whether or not RELOC indicates that DECL's initializer
5631 might contain runtime relocations.
5633 We make the section read-only and executable for a function decl,
5634 read-only for a const data decl, and writable for a non-const data decl. */
5637 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5641 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5642 flags
= SECTION_CODE
;
5643 else if (decl
&& decl_readonly_section (decl
, reloc
))
5645 else if (current_function_decl
5647 && crtl
->subsections
.unlikely_text_section_name
5648 && strcmp (name
, crtl
->subsections
.unlikely_text_section_name
) == 0)
5649 flags
= SECTION_CODE
;
5651 && (!current_function_decl
|| !cfun
)
5652 && strcmp (name
, UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
5653 flags
= SECTION_CODE
;
5655 flags
= SECTION_WRITE
;
5657 if (decl
&& DECL_ONE_ONLY (decl
))
5658 flags
|= SECTION_LINKONCE
;
5660 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5661 flags
|= SECTION_TLS
| SECTION_WRITE
;
5663 if (strcmp (name
, ".bss") == 0
5664 || strncmp (name
, ".bss.", 5) == 0
5665 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
5666 || strcmp (name
, ".sbss") == 0
5667 || strncmp (name
, ".sbss.", 6) == 0
5668 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
5669 flags
|= SECTION_BSS
;
5671 if (strcmp (name
, ".tdata") == 0
5672 || strncmp (name
, ".tdata.", 7) == 0
5673 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
5674 flags
|= SECTION_TLS
;
5676 if (strcmp (name
, ".tbss") == 0
5677 || strncmp (name
, ".tbss.", 6) == 0
5678 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
5679 flags
|= SECTION_TLS
| SECTION_BSS
;
5681 /* These three sections have special ELF types. They are neither
5682 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5683 want to print a section type (@progbits or @nobits). If someone
5684 is silly enough to emit code or TLS variables to one of these
5685 sections, then don't handle them specially. */
5686 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
5687 && (strcmp (name
, ".init_array") == 0
5688 || strcmp (name
, ".fini_array") == 0
5689 || strcmp (name
, ".preinit_array") == 0))
5690 flags
|= SECTION_NOTYPE
;
5695 /* Return true if the target supports some form of global BSS,
5696 either through bss_noswitch_section, or by selecting a BSS
5697 section in TARGET_ASM_SELECT_SECTION. */
5700 have_global_bss_p (void)
5702 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
5705 /* Output assembly to switch to section NAME with attribute FLAGS.
5706 Four variants for common object file formats. */
5709 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
5710 unsigned int flags ATTRIBUTE_UNUSED
,
5711 tree decl ATTRIBUTE_UNUSED
)
5713 /* Some object formats don't support named sections at all. The
5714 front-end should already have flagged this as an error. */
5719 default_elf_asm_named_section (const char *name
, unsigned int flags
,
5720 tree decl ATTRIBUTE_UNUSED
)
5722 char flagchars
[10], *f
= flagchars
;
5724 /* If we have already declared this section, we can use an
5725 abbreviated form to switch back to it -- unless this section is
5726 part of a COMDAT groups, in which case GAS requires the full
5727 declaration every time. */
5728 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5729 && (flags
& SECTION_DECLARED
))
5731 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
5735 if (!(flags
& SECTION_DEBUG
))
5737 if (flags
& SECTION_WRITE
)
5739 if (flags
& SECTION_CODE
)
5741 if (flags
& SECTION_SMALL
)
5743 if (flags
& SECTION_MERGE
)
5745 if (flags
& SECTION_STRINGS
)
5747 if (flags
& SECTION_TLS
)
5749 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5753 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
5755 if (!(flags
& SECTION_NOTYPE
))
5760 if (flags
& SECTION_BSS
)
5766 #ifdef ASM_COMMENT_START
5767 /* On platforms that use "@" as the assembly comment character,
5769 if (strcmp (ASM_COMMENT_START
, "@") == 0)
5772 fprintf (asm_out_file
, format
, type
);
5774 if (flags
& SECTION_ENTSIZE
)
5775 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
5776 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5777 fprintf (asm_out_file
, ",%s,comdat",
5778 lang_hooks
.decls
.comdat_group (decl
));
5781 putc ('\n', asm_out_file
);
5785 default_coff_asm_named_section (const char *name
, unsigned int flags
,
5786 tree decl ATTRIBUTE_UNUSED
)
5788 char flagchars
[8], *f
= flagchars
;
5790 if (flags
& SECTION_WRITE
)
5792 if (flags
& SECTION_CODE
)
5796 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
5800 default_pe_asm_named_section (const char *name
, unsigned int flags
,
5803 default_coff_asm_named_section (name
, flags
, decl
);
5805 if (flags
& SECTION_LINKONCE
)
5807 /* Functions may have been compiled at various levels of
5808 optimization so we can't use `same_size' here.
5809 Instead, have the linker pick one. */
5810 fprintf (asm_out_file
, "\t.linkonce %s\n",
5811 (flags
& SECTION_CODE
? "discard" : "same_size"));
5815 /* The lame default section selector. */
5818 default_select_section (tree decl
, int reloc
,
5819 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
5823 if (decl_readonly_section (decl
, reloc
))
5824 return readonly_data_section
;
5826 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5828 if (! ((flag_pic
&& reloc
)
5829 || !TREE_READONLY (decl
)
5830 || TREE_SIDE_EFFECTS (decl
)
5831 || !TREE_CONSTANT (decl
)))
5832 return readonly_data_section
;
5834 else if (TREE_CODE (decl
) == STRING_CST
)
5835 return readonly_data_section
;
5836 else if (! (flag_pic
&& reloc
))
5837 return readonly_data_section
;
5839 return data_section
;
5842 enum section_category
5843 categorize_decl_for_section (const_tree decl
, int reloc
)
5845 enum section_category ret
;
5847 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5849 else if (TREE_CODE (decl
) == STRING_CST
)
5851 if (flag_mudflap
) /* or !flag_merge_constants */
5852 return SECCAT_RODATA
;
5854 return SECCAT_RODATA_MERGE_STR
;
5856 else if (TREE_CODE (decl
) == VAR_DECL
)
5858 if (bss_initializer_p (decl
))
5860 else if (! TREE_READONLY (decl
)
5861 || TREE_SIDE_EFFECTS (decl
)
5862 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
5864 /* Here the reloc_rw_mask is not testing whether the section should
5865 be read-only or not, but whether the dynamic link will have to
5866 do something. If so, we wish to segregate the data in order to
5867 minimize cache misses inside the dynamic linker. */
5868 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
5869 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
5873 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
5874 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
5875 else if (reloc
|| flag_merge_constants
< 2)
5876 /* C and C++ don't allow different variables to share the same
5877 location. -fmerge-all-constants allows even that (at the
5878 expense of not conforming). */
5879 ret
= SECCAT_RODATA
;
5880 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
5881 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
5883 ret
= SECCAT_RODATA_MERGE_CONST
;
5885 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5887 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
5888 || TREE_SIDE_EFFECTS (decl
)
5889 || ! TREE_CONSTANT (decl
))
5892 ret
= SECCAT_RODATA
;
5895 ret
= SECCAT_RODATA
;
5897 /* There are no read-only thread-local sections. */
5898 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TLS_MODEL (decl
))
5900 if (DECL_TLS_MODEL (decl
) == TLS_MODEL_EMULATED
)
5902 if (DECL_EMUTLS_VAR_P (decl
))
5904 if (targetm
.emutls
.var_section
)
5905 ret
= SECCAT_EMUTLS_VAR
;
5909 if (targetm
.emutls
.tmpl_prefix
)
5910 ret
= SECCAT_EMUTLS_TMPL
;
5913 /* Note that this would be *just* SECCAT_BSS, except that there's
5914 no concept of a read-only thread-local-data section. */
5915 else if (ret
== SECCAT_BSS
5916 || (flag_zero_initialized_in_bss
5917 && initializer_zerop (DECL_INITIAL (decl
))))
5923 /* If the target uses small data sections, select it. */
5924 else if (targetm
.in_small_data_p (decl
))
5926 if (ret
== SECCAT_BSS
)
5928 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
5929 ret
= SECCAT_SRODATA
;
5938 decl_readonly_section (const_tree decl
, int reloc
)
5940 switch (categorize_decl_for_section (decl
, reloc
))
5943 case SECCAT_RODATA_MERGE_STR
:
5944 case SECCAT_RODATA_MERGE_STR_INIT
:
5945 case SECCAT_RODATA_MERGE_CONST
:
5946 case SECCAT_SRODATA
:
5955 /* Select a section based on the above categorization. */
5958 default_elf_select_section (tree decl
, int reloc
,
5959 unsigned HOST_WIDE_INT align
)
5962 switch (categorize_decl_for_section (decl
, reloc
))
5965 /* We're not supposed to be called on FUNCTION_DECLs. */
5968 return readonly_data_section
;
5969 case SECCAT_RODATA_MERGE_STR
:
5970 return mergeable_string_section (decl
, align
, 0);
5971 case SECCAT_RODATA_MERGE_STR_INIT
:
5972 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
5973 case SECCAT_RODATA_MERGE_CONST
:
5974 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
5975 case SECCAT_SRODATA
:
5979 return data_section
;
5980 case SECCAT_DATA_REL
:
5981 sname
= ".data.rel";
5983 case SECCAT_DATA_REL_LOCAL
:
5984 sname
= ".data.rel.local";
5986 case SECCAT_DATA_REL_RO
:
5987 sname
= ".data.rel.ro";
5989 case SECCAT_DATA_REL_RO_LOCAL
:
5990 sname
= ".data.rel.ro.local";
6009 case SECCAT_EMUTLS_VAR
:
6010 sname
= targetm
.emutls
.var_section
;
6012 case SECCAT_EMUTLS_TMPL
:
6013 sname
= targetm
.emutls
.tmpl_section
;
6021 return get_named_section (decl
, sname
, reloc
);
6024 /* Construct a unique section name based on the decl name and the
6025 categorization performed above. */
6028 default_unique_section (tree decl
, int reloc
)
6030 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6031 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6032 const char *prefix
, *name
, *linkonce
;
6035 switch (categorize_decl_for_section (decl
, reloc
))
6038 prefix
= one_only
? ".t" : ".text";
6041 case SECCAT_RODATA_MERGE_STR
:
6042 case SECCAT_RODATA_MERGE_STR_INIT
:
6043 case SECCAT_RODATA_MERGE_CONST
:
6044 prefix
= one_only
? ".r" : ".rodata";
6046 case SECCAT_SRODATA
:
6047 prefix
= one_only
? ".s2" : ".sdata2";
6050 prefix
= one_only
? ".d" : ".data";
6052 case SECCAT_DATA_REL
:
6053 prefix
= one_only
? ".d.rel" : ".data.rel";
6055 case SECCAT_DATA_REL_LOCAL
:
6056 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6058 case SECCAT_DATA_REL_RO
:
6059 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6061 case SECCAT_DATA_REL_RO_LOCAL
:
6062 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6065 prefix
= one_only
? ".s" : ".sdata";
6068 prefix
= one_only
? ".b" : ".bss";
6071 prefix
= one_only
? ".sb" : ".sbss";
6074 prefix
= one_only
? ".td" : ".tdata";
6077 prefix
= one_only
? ".tb" : ".tbss";
6079 case SECCAT_EMUTLS_VAR
:
6080 prefix
= targetm
.emutls
.var_section
;
6082 case SECCAT_EMUTLS_TMPL
:
6083 prefix
= targetm
.emutls
.tmpl_section
;
6089 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6090 name
= targetm
.strip_name_encoding (name
);
6092 /* If we're using one_only, then there needs to be a .gnu.linkonce
6093 prefix to the section name. */
6094 linkonce
= one_only
? ".gnu.linkonce" : "";
6096 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6098 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6101 /* Like compute_reloc_for_constant, except for an RTX. The return value
6102 is a mask for which bit 1 indicates a global relocation, and bit 0
6103 indicates a local relocation. */
6106 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6108 int *preloc
= (int *) data
;
6111 switch (GET_CODE (x
))
6114 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6127 compute_reloc_for_rtx (rtx x
)
6131 switch (GET_CODE (x
))
6137 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6146 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6148 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6150 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6151 return data_section
;
6153 return readonly_data_section
;
6157 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6158 unsigned HOST_WIDE_INT align
)
6160 int reloc
= compute_reloc_for_rtx (x
);
6162 /* ??? Handle small data here somehow. */
6164 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6167 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6169 return get_named_section (NULL
, ".data.rel.ro", 3);
6172 return mergeable_constant_section (mode
, align
, 0);
6175 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6178 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6183 /* Careful not to prod global register variables. */
6186 symbol
= XEXP (rtl
, 0);
6187 if (GET_CODE (symbol
) != SYMBOL_REF
)
6190 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6191 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6192 flags
|= SYMBOL_FLAG_FUNCTION
;
6193 if (targetm
.binds_local_p (decl
))
6194 flags
|= SYMBOL_FLAG_LOCAL
;
6195 if (targetm
.have_tls
&& TREE_CODE (decl
) == VAR_DECL
6196 && DECL_THREAD_LOCAL_P (decl
))
6197 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6198 else if (targetm
.in_small_data_p (decl
))
6199 flags
|= SYMBOL_FLAG_SMALL
;
6200 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6201 being PUBLIC, the thing *must* be defined in this translation unit.
6202 Prevent this buglet from being propagated into rtl code as well. */
6203 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6204 flags
|= SYMBOL_FLAG_EXTERNAL
;
6206 SYMBOL_REF_FLAGS (symbol
) = flags
;
6209 /* By default, we do nothing for encode_section_info, so we need not
6210 do anything but discard the '*' marker. */
6213 default_strip_name_encoding (const char *str
)
6215 return str
+ (*str
== '*');
6218 #ifdef ASM_OUTPUT_DEF
6219 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6220 anchor relative to ".", the current section position. */
6223 default_asm_output_anchor (rtx symbol
)
6227 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6228 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6229 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6233 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6236 default_use_anchors_for_symbol_p (const_rtx symbol
)
6241 /* Don't use anchors for mergeable sections. The linker might move
6242 the objects around. */
6243 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6244 if (sect
->common
.flags
& SECTION_MERGE
)
6247 /* Don't use anchors for small data sections. The small data register
6248 acts as an anchor for such sections. */
6249 if (sect
->common
.flags
& SECTION_SMALL
)
6252 decl
= SYMBOL_REF_DECL (symbol
);
6253 if (decl
&& DECL_P (decl
))
6255 /* Don't use section anchors for decls that might be defined by
6257 if (!targetm
.binds_local_p (decl
))
6260 /* Don't use section anchors for decls that will be placed in a
6261 small data section. */
6262 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6263 one above. The problem is that we only use SECTION_SMALL for
6264 sections that should be marked as small in the section directive. */
6265 if (targetm
.in_small_data_p (decl
))
6271 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6272 wrt cross-module name binding. */
6275 default_binds_local_p (const_tree exp
)
6277 return default_binds_local_p_1 (exp
, flag_shlib
);
6281 default_binds_local_p_1 (const_tree exp
, int shlib
)
6285 /* A non-decl is an entry in the constant pool. */
6288 /* Weakrefs may not bind locally, even though the weakref itself is
6289 always static and therefore local. */
6290 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
)))
6292 /* Static variables are always local. */
6293 else if (! TREE_PUBLIC (exp
))
6295 /* A variable is local if the user has said explicitly that it will
6297 else if (DECL_VISIBILITY_SPECIFIED (exp
)
6298 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6300 /* Variables defined outside this object might not be local. */
6301 else if (DECL_EXTERNAL (exp
))
6303 /* If defined in this object and visibility is not default, must be
6305 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6307 /* Default visibility weak data can be overridden by a strong symbol
6308 in another module and so are not local. */
6309 else if (DECL_WEAK (exp
))
6311 /* If PIC, then assume that any global name can be overridden by
6312 symbols resolved from other modules, unless we are compiling with
6313 -fwhole-program, which assumes that names are local. */
6315 local_p
= flag_whole_program
;
6316 /* Uninitialized COMMON variable may be unified with symbols
6317 resolved from other modules. */
6318 else if (DECL_COMMON (exp
)
6319 && (DECL_INITIAL (exp
) == NULL
6320 || DECL_INITIAL (exp
) == error_mark_node
))
6322 /* Otherwise we're left with initialized (or non-common) global data
6323 which is of necessity defined locally. */
6330 /* Determine whether or not a pointer mode is valid. Assume defaults
6331 of ptr_mode or Pmode - can be overridden. */
6333 default_valid_pointer_mode (enum machine_mode mode
)
6335 return (mode
== ptr_mode
|| mode
== Pmode
);
6338 /* Default function to output code that will globalize a label. A
6339 target must define GLOBAL_ASM_OP or provide its own function to
6340 globalize a label. */
6341 #ifdef GLOBAL_ASM_OP
6343 default_globalize_label (FILE * stream
, const char *name
)
6345 fputs (GLOBAL_ASM_OP
, stream
);
6346 assemble_name (stream
, name
);
6347 putc ('\n', stream
);
6349 #endif /* GLOBAL_ASM_OP */
6351 /* Default function to output code that will globalize a declaration. */
6353 default_globalize_decl_name (FILE * stream
, tree decl
)
6355 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6356 targetm
.asm_out
.globalize_label (stream
, name
);
6359 /* Default function to output a label for unwind information. The
6360 default is to do nothing. A target that needs nonlocal labels for
6361 unwind information must provide its own function to do this. */
6363 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6364 tree decl ATTRIBUTE_UNUSED
,
6365 int for_eh ATTRIBUTE_UNUSED
,
6366 int empty ATTRIBUTE_UNUSED
)
6370 /* Default function to output a label to divide up the exception table.
6371 The default is to do nothing. A target that needs/wants to divide
6372 up the table must provide it's own function to do this. */
6374 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6378 /* This is how to output an internal numbered label where PREFIX is
6379 the class of label and LABELNO is the number within the class. */
6382 default_internal_label (FILE *stream
, const char *prefix
,
6383 unsigned long labelno
)
6385 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6386 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6387 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6390 /* This is the default behavior at the beginning of a file. It's
6391 controlled by two other target-hook toggles. */
6393 default_file_start (void)
6395 if (targetm
.file_start_app_off
6396 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6397 fputs (ASM_APP_OFF
, asm_out_file
);
6399 if (targetm
.file_start_file_directive
)
6400 output_file_directive (asm_out_file
, main_input_filename
);
6403 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6404 which emits a special section directive used to indicate whether or
6405 not this object file needs an executable stack. This is primarily
6406 a GNU extension to ELF but could be used on other targets. */
6408 int trampolines_created
;
6411 file_end_indicate_exec_stack (void)
6413 unsigned int flags
= SECTION_DEBUG
;
6414 if (trampolines_created
)
6415 flags
|= SECTION_CODE
;
6417 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6420 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6421 a get_unnamed_section callback. */
6424 output_section_asm_op (const void *directive
)
6426 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6429 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6430 the current section is NEW_SECTION. */
6433 switch_to_section (section
*new_section
)
6435 if (in_section
== new_section
)
6438 if (new_section
->common
.flags
& SECTION_FORGET
)
6441 in_section
= new_section
;
6443 switch (SECTION_STYLE (new_section
))
6447 && !crtl
->subsections
.unlikely_text_section_name
6448 && strcmp (new_section
->named
.name
,
6449 UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
6450 crtl
->subsections
.unlikely_text_section_name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
6452 targetm
.asm_out
.named_section (new_section
->named
.name
,
6453 new_section
->named
.common
.flags
,
6454 new_section
->named
.decl
);
6457 case SECTION_UNNAMED
:
6458 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6461 case SECTION_NOSWITCH
:
6466 new_section
->common
.flags
|= SECTION_DECLARED
;
6469 /* If block symbol SYMBOL has not yet been assigned an offset, place
6470 it at the end of its block. */
6473 place_block_symbol (rtx symbol
)
6475 unsigned HOST_WIDE_INT size
, mask
, offset
;
6476 struct constant_descriptor_rtx
*desc
;
6477 unsigned int alignment
;
6478 struct object_block
*block
;
6481 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6482 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6485 /* Work out the symbol's size and alignment. */
6486 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6488 desc
= SYMBOL_REF_CONSTANT (symbol
);
6489 alignment
= desc
->align
;
6490 size
= GET_MODE_SIZE (desc
->mode
);
6492 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6494 decl
= SYMBOL_REF_DECL (symbol
);
6495 alignment
= get_constant_alignment (decl
);
6496 size
= get_constant_size (decl
);
6500 decl
= SYMBOL_REF_DECL (symbol
);
6501 alignment
= DECL_ALIGN (decl
);
6502 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6505 /* Calculate the object's offset from the start of the block. */
6506 block
= SYMBOL_REF_BLOCK (symbol
);
6507 mask
= alignment
/ BITS_PER_UNIT
- 1;
6508 offset
= (block
->size
+ mask
) & ~mask
;
6509 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6511 /* Record the block's new alignment and size. */
6512 block
->alignment
= MAX (block
->alignment
, alignment
);
6513 block
->size
= offset
+ size
;
6515 VEC_safe_push (rtx
, gc
, block
->objects
, symbol
);
6518 /* Return the anchor that should be used to address byte offset OFFSET
6519 from the first object in BLOCK. MODEL is the TLS model used
6523 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
6524 enum tls_model model
)
6527 unsigned int begin
, middle
, end
;
6528 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
6531 /* Work out the anchor's offset. Use an offset of 0 for the first
6532 anchor so that we don't pessimize the case where we take the address
6533 of a variable at the beginning of the block. This is particularly
6534 useful when a block has only one variable assigned to it.
6536 We try to place anchors RANGE bytes apart, so there can then be
6537 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6538 a ptr_mode offset. With some target settings, the lowest such
6539 anchor might be out of range for the lowest ptr_mode offset;
6540 likewise the highest anchor for the highest offset. Use anchors
6541 at the extreme ends of the ptr_mode range in such cases.
6543 All arithmetic uses unsigned integers in order to avoid
6545 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
6546 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
6547 range
= max_offset
- min_offset
+ 1;
6552 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
6555 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
6556 delta
-= delta
% range
;
6559 offset
= (HOST_WIDE_INT
) (-delta
);
6563 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
6564 delta
-= delta
% range
;
6565 if (delta
> bias
- 1)
6567 offset
= (HOST_WIDE_INT
) delta
;
6571 /* Do a binary search to see if there's already an anchor we can use.
6572 Set BEGIN to the new anchor's index if not. */
6574 end
= VEC_length (rtx
, block
->anchors
);
6575 while (begin
!= end
)
6577 middle
= (end
+ begin
) / 2;
6578 anchor
= VEC_index (rtx
, block
->anchors
, middle
);
6579 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
6581 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
6583 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
6585 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
6591 /* Create a new anchor with a unique label. */
6592 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
6593 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
6594 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
6595 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
6597 /* Insert it at index BEGIN. */
6598 VEC_safe_insert (rtx
, gc
, block
->anchors
, begin
, anchor
);
6602 /* Output the objects in BLOCK. */
6605 output_object_block (struct object_block
*block
)
6607 struct constant_descriptor_rtx
*desc
;
6609 HOST_WIDE_INT offset
;
6613 if (block
->objects
== NULL
)
6616 /* Switch to the section and make sure that the first byte is
6617 suitably aligned. */
6618 switch_to_section (block
->sect
);
6619 assemble_align (block
->alignment
);
6621 /* Define the values of all anchors relative to the current section
6623 for (i
= 0; VEC_iterate (rtx
, block
->anchors
, i
, symbol
); i
++)
6624 targetm
.asm_out
.output_anchor (symbol
);
6626 /* Output the objects themselves. */
6628 for (i
= 0; VEC_iterate (rtx
, block
->objects
, i
, symbol
); i
++)
6630 /* Move to the object's offset, padding with zeros if necessary. */
6631 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
6632 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
6633 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6635 desc
= SYMBOL_REF_CONSTANT (symbol
);
6636 output_constant_pool_1 (desc
, 1);
6637 offset
+= GET_MODE_SIZE (desc
->mode
);
6639 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6641 decl
= SYMBOL_REF_DECL (symbol
);
6642 assemble_constant_contents (decl
, XSTR (symbol
, 0),
6643 get_constant_alignment (decl
));
6644 offset
+= get_constant_size (decl
);
6648 decl
= SYMBOL_REF_DECL (symbol
);
6649 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
6650 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6655 /* A htab_traverse callback used to call output_object_block for
6656 each member of object_block_htab. */
6659 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
6661 output_object_block ((struct object_block
*) (*slot
));
6665 /* Output the definitions of all object_blocks. */
6668 output_object_blocks (void)
6670 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
6673 /* This function provides a possible implementation of the
6674 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6675 by -frecord-gcc-switches it creates a new mergeable, string section in the
6676 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6677 contains the switches in ASCII format.
6679 FIXME: This code does not correctly handle double quote characters
6680 that appear inside strings, (it strips them rather than preserving them).
6681 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6682 characters - instead it treats them as sub-string separators. Since
6683 we want to emit NUL strings terminators into the object file we have to use
6687 elf_record_gcc_switches (print_switch_type type
, const char * name
)
6689 static char buffer
[1024];
6691 /* This variable is used as part of a simplistic heuristic to detect
6692 command line switches which take an argument:
6694 "If a command line option does not start with a dash then
6695 it is an argument for the previous command line option."
6697 This fails in the case of the command line option which is the name
6698 of the file to compile, but otherwise it is pretty reasonable. */
6699 static bool previous_name_held_back
= FALSE
;
6703 case SWITCH_TYPE_PASSED
:
6706 if (previous_name_held_back
)
6708 unsigned int len
= strlen (buffer
);
6710 snprintf (buffer
+ len
, sizeof buffer
- len
, " %s", name
);
6711 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6712 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6713 previous_name_held_back
= FALSE
;
6717 strncpy (buffer
, name
, sizeof buffer
);
6718 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6719 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6724 if (previous_name_held_back
)
6726 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6727 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6730 strncpy (buffer
, name
, sizeof buffer
);
6731 previous_name_held_back
= TRUE
;
6735 case SWITCH_TYPE_DESCRIPTIVE
:
6738 /* Distinguish between invocations where name is NULL. */
6739 static bool started
= false;
6743 if (previous_name_held_back
)
6745 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6746 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6753 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
6757 | (SECTION_ENTSIZE
& 1),
6759 switch_to_section (sec
);
6768 /* The return value is currently ignored by the caller, but must be 0.
6769 For -fverbose-asm the return value would be the number of characters
6770 emitted into the assembler file. */
6774 /* Emit text to declare externally defined symbols. It is needed to
6775 properly support non-default visibility. */
6777 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
6779 const char *name ATTRIBUTE_UNUSED
)
6781 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6782 set in order to avoid putting out names that are never really
6784 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
6785 && targetm
.binds_local_p (decl
))
6786 maybe_assemble_visibility (decl
);
6789 #include "gt-varasm.h"