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
= 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
);
374 to
= build_decl (VAR_DECL
, get_emutls_object_name (name
),
375 get_emutls_object_type ());
377 h
= ggc_alloc (sizeof (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
= p1
;
473 const char *new = p2
;
475 return strcmp (old
->named
.name
, new) == 0;
479 section_entry_hash (const void *p
)
481 const section
*old
= 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
= p1
;
501 const section
*new = p2
;
503 return old
->sect
== new;
507 object_block_entry_hash (const void *p
)
509 const struct object_block
*old
= 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_alloc (sizeof (struct unnamed_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_alloc (sizeof (struct unnamed_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_alloc (sizeof (struct named_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
= 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
= 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
= 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
= 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
= 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
= 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 && cfun
->function_frequency
!= FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
)
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 /* In unit-at-a-time mode, 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 /* Output something to declare an external symbol to the assembler.
2290 (Most assemblers don't need this, so we normally output nothing.)
2291 Do nothing if DECL is not external. */
2294 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2296 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2297 main body of this code is only rarely exercised. To provide some
2298 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2299 open. If it's not, we should not be calling this function. */
2300 gcc_assert (asm_out_file
);
2302 #ifdef ASM_OUTPUT_EXTERNAL
2303 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2306 /* We want to output external symbols at very last to check if they
2307 are references or not. */
2308 pending_assemble_externals
= tree_cons (0, decl
,
2309 pending_assemble_externals
);
2313 /* Similar, for calling a library function FUN. */
2316 assemble_external_libcall (rtx fun
)
2318 /* Declare library function name external when first used, if nec. */
2319 if (! SYMBOL_REF_USED (fun
))
2321 SYMBOL_REF_USED (fun
) = 1;
2322 targetm
.asm_out
.external_libcall (fun
);
2326 /* Assemble a label named NAME. */
2329 assemble_label (const char *name
)
2331 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2334 /* Set the symbol_referenced flag for ID. */
2336 mark_referenced (tree id
)
2338 TREE_SYMBOL_REFERENCED (id
) = 1;
2341 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2343 mark_decl_referenced (tree decl
)
2345 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2347 /* Extern inline functions don't become needed when referenced.
2348 If we know a method will be emitted in other TU and no new
2349 functions can be marked reachable, just use the external
2351 struct cgraph_node
*node
= cgraph_node (decl
);
2352 if (!DECL_EXTERNAL (decl
)
2353 && (!node
->local
.vtable_method
|| !cgraph_global_info_ready
2354 || !node
->local
.finalized
))
2355 cgraph_mark_needed_node (node
);
2357 else if (TREE_CODE (decl
) == VAR_DECL
)
2359 struct varpool_node
*node
= varpool_node (decl
);
2360 varpool_mark_needed_node (node
);
2361 /* C++ frontend use mark_decl_references to force COMDAT variables
2362 to be output that might appear dead otherwise. */
2363 node
->force_output
= true;
2365 /* else do nothing - we can get various sorts of CST nodes here,
2366 which do not need to be marked. */
2370 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2371 until we find an identifier that is not itself a transparent alias.
2372 Modify the alias passed to it by reference (and all aliases on the
2373 way to the ultimate target), such that they do not have to be
2374 followed again, and return the ultimate target of the alias
2378 ultimate_transparent_alias_target (tree
*alias
)
2380 tree target
= *alias
;
2382 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2384 gcc_assert (TREE_CHAIN (target
));
2385 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2386 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2387 && ! TREE_CHAIN (target
));
2394 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2395 starts with a *, the rest of NAME is output verbatim. Otherwise
2396 NAME is transformed in a target-specific way (usually by the
2397 addition of an underscore). */
2400 assemble_name_raw (FILE *file
, const char *name
)
2403 fputs (&name
[1], file
);
2405 ASM_OUTPUT_LABELREF (file
, name
);
2408 /* Like assemble_name_raw, but should be used when NAME might refer to
2409 an entity that is also represented as a tree (like a function or
2410 variable). If NAME does refer to such an entity, that entity will
2411 be marked as referenced. */
2414 assemble_name (FILE *file
, const char *name
)
2416 const char *real_name
;
2419 real_name
= targetm
.strip_name_encoding (name
);
2421 id
= maybe_get_identifier (real_name
);
2426 mark_referenced (id
);
2427 ultimate_transparent_alias_target (&id
);
2429 name
= IDENTIFIER_POINTER (id
);
2430 gcc_assert (! TREE_CHAIN (id
));
2433 assemble_name_raw (file
, name
);
2436 /* Allocate SIZE bytes writable static space with a gensym name
2437 and return an RTX to refer to its address. */
2440 assemble_static_space (unsigned HOST_WIDE_INT size
)
2443 const char *namestring
;
2446 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2448 namestring
= ggc_strdup (name
);
2450 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2451 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2453 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2454 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2457 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2458 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2461 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2462 so that each uninitialized object starts on such a boundary. */
2463 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2464 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2465 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2466 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2467 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2468 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2475 /* Assemble the static constant template for function entry trampolines.
2476 This is done at most once per compilation.
2477 Returns an RTX for the address of the template. */
2479 static GTY(()) rtx initial_trampoline
;
2481 #ifdef TRAMPOLINE_TEMPLATE
2483 assemble_trampoline_template (void)
2490 if (initial_trampoline
)
2491 return initial_trampoline
;
2493 /* By default, put trampoline templates in read-only data section. */
2495 #ifdef TRAMPOLINE_SECTION
2496 switch_to_section (TRAMPOLINE_SECTION
);
2498 switch_to_section (readonly_data_section
);
2501 /* Write the assembler code to define one. */
2502 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2505 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2508 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2509 TRAMPOLINE_TEMPLATE (asm_out_file
);
2511 /* Record the rtl to refer to it. */
2512 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2513 name
= ggc_strdup (label
);
2514 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2515 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2517 initial_trampoline
= gen_rtx_MEM (BLKmode
, symbol
);
2518 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2520 return initial_trampoline
;
2524 /* A and B are either alignments or offsets. Return the minimum alignment
2525 that may be assumed after adding the two together. */
2527 static inline unsigned
2528 min_align (unsigned int a
, unsigned int b
)
2530 return (a
| b
) & -(a
| b
);
2533 /* Return the assembler directive for creating a given kind of integer
2534 object. SIZE is the number of bytes in the object and ALIGNED_P
2535 indicates whether it is known to be aligned. Return NULL if the
2536 assembly dialect has no such directive.
2538 The returned string should be printed at the start of a new line and
2539 be followed immediately by the object's initial value. */
2542 integer_asm_op (int size
, int aligned_p
)
2544 struct asm_int_op
*ops
;
2547 ops
= &targetm
.asm_out
.aligned_op
;
2549 ops
= &targetm
.asm_out
.unaligned_op
;
2554 return targetm
.asm_out
.byte_op
;
2568 /* Use directive OP to assemble an integer object X. Print OP at the
2569 start of the line, followed immediately by the value of X. */
2572 assemble_integer_with_op (const char *op
, rtx x
)
2574 fputs (op
, asm_out_file
);
2575 output_addr_const (asm_out_file
, x
);
2576 fputc ('\n', asm_out_file
);
2579 /* The default implementation of the asm_out.integer target hook. */
2582 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2583 unsigned int size ATTRIBUTE_UNUSED
,
2584 int aligned_p ATTRIBUTE_UNUSED
)
2586 const char *op
= integer_asm_op (size
, aligned_p
);
2587 /* Avoid GAS bugs for large values. Specifically negative values whose
2588 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2589 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2591 return op
&& (assemble_integer_with_op (op
, x
), true);
2594 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2595 the alignment of the integer in bits. Return 1 if we were able to output
2596 the constant, otherwise 0. We must be able to output the constant,
2597 if FORCE is nonzero. */
2600 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2604 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2606 /* See if the target hook can handle this kind of object. */
2607 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2610 /* If the object is a multi-byte one, try splitting it up. Split
2611 it into words it if is multi-word, otherwise split it into bytes. */
2614 enum machine_mode omode
, imode
;
2615 unsigned int subalign
;
2616 unsigned int subsize
, i
;
2617 unsigned char mclass
;
2619 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2620 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2621 if (GET_CODE (x
) == CONST_FIXED
)
2622 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2626 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2627 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2629 for (i
= 0; i
< size
; i
+= subsize
)
2631 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2632 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2638 /* If we've printed some of it, but not all of it, there's no going
2643 gcc_assert (!force
);
2649 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2651 long data
[4] = {0, 0, 0, 0};
2653 int bitsize
, nelts
, nunits
, units_per
;
2655 /* This is hairy. We have a quantity of known size. real_to_target
2656 will put it into an array of *host* longs, 32 bits per element
2657 (even if long is more than 32 bits). We need to determine the
2658 number of array elements that are occupied (nelts) and the number
2659 of *target* min-addressable units that will be occupied in the
2660 object file (nunits). We cannot assume that 32 divides the
2661 mode's bitsize (size * BITS_PER_UNIT) evenly.
2663 size * BITS_PER_UNIT is used here to make sure that padding bits
2664 (which might appear at either end of the value; real_to_target
2665 will include the padding bits in its output array) are included. */
2667 nunits
= GET_MODE_SIZE (mode
);
2668 bitsize
= nunits
* BITS_PER_UNIT
;
2669 nelts
= CEIL (bitsize
, 32);
2670 units_per
= 32 / BITS_PER_UNIT
;
2672 real_to_target (data
, &d
, mode
);
2674 /* Put out the first word with the specified alignment. */
2675 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2676 nunits
-= units_per
;
2678 /* Subsequent words need only 32-bit alignment. */
2679 align
= min_align (align
, 32);
2681 for (i
= 1; i
< nelts
; i
++)
2683 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2684 nunits
-= units_per
;
2688 /* Given an expression EXP with a constant value,
2689 reduce it to the sum of an assembler symbol and an integer.
2690 Store them both in the structure *VALUE.
2691 EXP must be reducible. */
2693 struct addr_const
GTY(())
2696 HOST_WIDE_INT offset
;
2700 decode_addr_const (tree exp
, struct addr_const
*value
)
2702 tree target
= TREE_OPERAND (exp
, 0);
2708 if (TREE_CODE (target
) == COMPONENT_REF
2709 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2712 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2713 target
= TREE_OPERAND (target
, 0);
2715 else if (TREE_CODE (target
) == ARRAY_REF
2716 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2718 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2719 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2720 target
= TREE_OPERAND (target
, 0);
2726 switch (TREE_CODE (target
))
2730 x
= DECL_RTL (target
);
2734 x
= gen_rtx_MEM (FUNCTION_MODE
,
2735 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2744 x
= output_constant_def (target
, 1);
2751 gcc_assert (MEM_P (x
));
2755 value
->offset
= offset
;
2758 /* Uniquize all constants that appear in memory.
2759 Each constant in memory thus far output is recorded
2760 in `const_desc_table'. */
2762 struct constant_descriptor_tree
GTY(())
2764 /* A MEM for the constant. */
2767 /* The value of the constant. */
2770 /* Hash of value. Computing the hash from value each time
2771 hashfn is called can't work properly, as that means recursive
2772 use of the hash table during hash table expansion. */
2776 static GTY((param_is (struct constant_descriptor_tree
)))
2777 htab_t const_desc_htab
;
2779 static struct constant_descriptor_tree
* build_constant_desc (tree
);
2780 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2782 /* Compute a hash code for a constant expression. */
2785 const_desc_hash (const void *ptr
)
2787 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2791 const_hash_1 (const tree exp
)
2796 enum tree_code code
= TREE_CODE (exp
);
2798 /* Either set P and LEN to the address and len of something to hash and
2799 exit the switch or return a value. */
2804 p
= (char *) &TREE_INT_CST (exp
);
2805 len
= sizeof TREE_INT_CST (exp
);
2809 return real_hash (TREE_REAL_CST_PTR (exp
));
2812 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2815 p
= TREE_STRING_POINTER (exp
);
2816 len
= TREE_STRING_LENGTH (exp
);
2820 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2821 + const_hash_1 (TREE_IMAGPART (exp
)));
2825 unsigned HOST_WIDE_INT idx
;
2828 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2830 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2832 hi
= hi
* 603 + const_hash_1 (value
);
2840 struct addr_const value
;
2842 decode_addr_const (exp
, &value
);
2843 switch (GET_CODE (value
.base
))
2846 /* Don't hash the address of the SYMBOL_REF;
2847 only use the offset and the symbol name. */
2849 p
= XSTR (value
.base
, 0);
2850 for (i
= 0; p
[i
] != 0; i
++)
2851 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2855 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2865 case POINTER_PLUS_EXPR
:
2867 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2868 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2871 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2874 /* A language specific constant. Just hash the code. */
2878 /* Compute hashing function. */
2880 for (i
= 0; i
< len
; i
++)
2881 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2886 /* Wrapper of compare_constant, for the htab interface. */
2888 const_desc_eq (const void *p1
, const void *p2
)
2890 const struct constant_descriptor_tree
*c1
= p1
;
2891 const struct constant_descriptor_tree
*c2
= p2
;
2892 if (c1
->hash
!= c2
->hash
)
2894 return compare_constant (c1
->value
, c2
->value
);
2897 /* Compare t1 and t2, and return 1 only if they are known to result in
2898 the same bit pattern on output. */
2901 compare_constant (const tree t1
, const tree t2
)
2903 enum tree_code typecode
;
2905 if (t1
== NULL_TREE
)
2906 return t2
== NULL_TREE
;
2907 if (t2
== NULL_TREE
)
2910 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2913 switch (TREE_CODE (t1
))
2916 /* Integer constants are the same only if the same width of type. */
2917 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2919 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2921 return tree_int_cst_equal (t1
, t2
);
2924 /* Real constants are the same only if the same width of type. */
2925 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2928 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2931 /* Fixed constants are the same only if the same width of type. */
2932 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2935 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2938 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2941 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2942 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2943 TREE_STRING_LENGTH (t1
)));
2946 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2947 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2951 VEC(constructor_elt
, gc
) *v1
, *v2
;
2952 unsigned HOST_WIDE_INT idx
;
2954 typecode
= TREE_CODE (TREE_TYPE (t1
));
2955 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2958 if (typecode
== ARRAY_TYPE
)
2960 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2961 /* For arrays, check that the sizes all match. */
2962 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2964 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2969 /* For record and union constructors, require exact type
2971 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2975 v1
= CONSTRUCTOR_ELTS (t1
);
2976 v2
= CONSTRUCTOR_ELTS (t2
);
2977 if (VEC_length (constructor_elt
, v1
)
2978 != VEC_length (constructor_elt
, v2
))
2981 for (idx
= 0; idx
< VEC_length (constructor_elt
, v1
); ++idx
)
2983 constructor_elt
*c1
= VEC_index (constructor_elt
, v1
, idx
);
2984 constructor_elt
*c2
= VEC_index (constructor_elt
, v2
, idx
);
2986 /* Check that each value is the same... */
2987 if (!compare_constant (c1
->value
, c2
->value
))
2989 /* ... and that they apply to the same fields! */
2990 if (typecode
== ARRAY_TYPE
)
2992 if (!compare_constant (c1
->index
, c2
->index
))
2997 if (c1
->index
!= c2
->index
)
3008 struct addr_const value1
, value2
;
3010 decode_addr_const (t1
, &value1
);
3011 decode_addr_const (t2
, &value2
);
3012 return (value1
.offset
== value2
.offset
3013 && strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3017 case POINTER_PLUS_EXPR
:
3020 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3021 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3024 case VIEW_CONVERT_EXPR
:
3025 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3034 /* Make a copy of the whole tree structure for a constant. This
3035 handles the same types of nodes that compare_constant handles. */
3038 copy_constant (tree exp
)
3040 switch (TREE_CODE (exp
))
3043 /* For ADDR_EXPR, we do not want to copy the decl whose address
3044 is requested. We do want to copy constants though. */
3045 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
3046 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3047 copy_constant (TREE_OPERAND (exp
, 0)));
3049 return copy_node (exp
);
3055 return copy_node (exp
);
3058 return build_complex (TREE_TYPE (exp
),
3059 copy_constant (TREE_REALPART (exp
)),
3060 copy_constant (TREE_IMAGPART (exp
)));
3063 case POINTER_PLUS_EXPR
:
3065 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3066 copy_constant (TREE_OPERAND (exp
, 0)),
3067 copy_constant (TREE_OPERAND (exp
, 1)));
3070 case VIEW_CONVERT_EXPR
:
3071 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3072 copy_constant (TREE_OPERAND (exp
, 0)));
3076 tree copy
= copy_node (exp
);
3077 VEC(constructor_elt
, gc
) *v
;
3078 unsigned HOST_WIDE_INT idx
;
3079 tree purpose
, value
;
3081 v
= VEC_alloc(constructor_elt
, gc
, VEC_length(constructor_elt
,
3082 CONSTRUCTOR_ELTS (exp
)));
3083 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3085 constructor_elt
*ce
= VEC_quick_push (constructor_elt
, v
, NULL
);
3086 ce
->index
= purpose
;
3087 ce
->value
= copy_constant (value
);
3089 CONSTRUCTOR_ELTS (copy
) = v
;
3098 /* Return the alignment of constant EXP in bits. */
3101 get_constant_alignment (tree exp
)
3105 align
= TYPE_ALIGN (TREE_TYPE (exp
));
3106 #ifdef CONSTANT_ALIGNMENT
3107 align
= CONSTANT_ALIGNMENT (exp
, align
);
3112 /* Return the section into which constant EXP should be placed. */
3115 get_constant_section (tree exp
)
3117 if (IN_NAMED_SECTION (exp
))
3118 return get_named_section (exp
, NULL
, compute_reloc_for_constant (exp
));
3120 return targetm
.asm_out
.select_section (exp
,
3121 compute_reloc_for_constant (exp
),
3122 get_constant_alignment (exp
));
3125 /* Return the size of constant EXP in bytes. */
3127 static HOST_WIDE_INT
3128 get_constant_size (tree exp
)
3132 size
= int_size_in_bytes (TREE_TYPE (exp
));
3133 if (TREE_CODE (exp
) == STRING_CST
)
3134 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3138 /* Subroutine of output_constant_def:
3139 No constant equal to EXP is known to have been output.
3140 Make a constant descriptor to enter EXP in the hash table.
3141 Assign the label number and construct RTL to refer to the
3142 constant's location in memory.
3143 Caller is responsible for updating the hash table. */
3145 static struct constant_descriptor_tree
*
3146 build_constant_desc (tree exp
)
3152 struct constant_descriptor_tree
*desc
;
3154 desc
= ggc_alloc (sizeof (*desc
));
3155 desc
->value
= copy_constant (exp
);
3157 /* Propagate marked-ness to copied constant. */
3158 if (flag_mudflap
&& mf_marked_p (exp
))
3159 mf_mark (desc
->value
);
3161 /* Create a string containing the label name, in LABEL. */
3162 labelno
= const_labelno
++;
3163 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3165 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3166 if (use_object_blocks_p ())
3168 section
*sect
= get_constant_section (exp
);
3169 symbol
= create_block_symbol (ggc_strdup (label
),
3170 get_block_for_section (sect
), -1);
3173 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3174 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3175 SET_SYMBOL_REF_DECL (symbol
, desc
->value
);
3176 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3178 rtl
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3179 set_mem_attributes (rtl
, exp
, 1);
3180 set_mem_alias_set (rtl
, 0);
3181 set_mem_alias_set (rtl
, const_alias_set
);
3183 /* Set flags or add text to the name to record information, such as
3184 that it is a local symbol. If the name is changed, the macro
3185 ASM_OUTPUT_LABELREF will have to know how to strip this
3186 information. This call might invalidate our local variable
3187 SYMBOL; we can't use it afterward. */
3189 targetm
.encode_section_info (exp
, rtl
, true);
3196 /* Return an rtx representing a reference to constant data in memory
3197 for the constant expression EXP.
3199 If assembler code for such a constant has already been output,
3200 return an rtx to refer to it.
3201 Otherwise, output such a constant in memory
3202 and generate an rtx for it.
3204 If DEFER is nonzero, this constant can be deferred and output only
3205 if referenced in the function after all optimizations.
3207 `const_desc_table' records which constants already have label strings. */
3210 output_constant_def (tree exp
, int defer
)
3212 struct constant_descriptor_tree
*desc
;
3213 struct constant_descriptor_tree key
;
3216 /* Look up EXP in the table of constant descriptors. If we didn't find
3217 it, create a new one. */
3219 key
.hash
= const_hash_1 (exp
);
3220 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3225 desc
= build_constant_desc (exp
);
3226 desc
->hash
= key
.hash
;
3230 maybe_output_constant_def_contents (desc
, defer
);
3234 /* Subroutine of output_constant_def: Decide whether or not we need to
3235 output the constant DESC now, and if so, do it. */
3237 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3240 rtx symbol
= XEXP (desc
->rtl
, 0);
3241 tree exp
= desc
->value
;
3243 if (flag_syntax_only
)
3246 if (TREE_ASM_WRITTEN (exp
))
3247 /* Already output; don't do it again. */
3250 /* We can always defer constants as long as the context allows
3254 /* Increment n_deferred_constants if it exists. It needs to be at
3255 least as large as the number of constants actually referred to
3256 by the function. If it's too small we'll stop looking too early
3257 and fail to emit constants; if it's too large we'll only look
3258 through the entire function when we could have stopped earlier. */
3260 n_deferred_constants
++;
3264 output_constant_def_contents (symbol
);
3267 /* Subroutine of output_constant_def_contents. Output the definition
3268 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3269 constant's alignment in bits. */
3272 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3276 size
= get_constant_size (exp
);
3278 /* Do any machine/system dependent processing of the constant. */
3279 #ifdef ASM_DECLARE_CONSTANT_NAME
3280 ASM_DECLARE_CONSTANT_NAME (asm_out_file
, label
, exp
, size
);
3282 /* Standard thing is just output label for the constant. */
3283 ASM_OUTPUT_LABEL (asm_out_file
, label
);
3284 #endif /* ASM_DECLARE_CONSTANT_NAME */
3286 /* Output the value of EXP. */
3287 output_constant (exp
, size
, align
);
3290 /* We must output the constant data referred to by SYMBOL; do so. */
3293 output_constant_def_contents (rtx symbol
)
3295 tree exp
= SYMBOL_REF_DECL (symbol
);
3298 /* Make sure any other constants whose addresses appear in EXP
3299 are assigned label numbers. */
3300 output_addressed_constants (exp
);
3302 /* We are no longer deferring this constant. */
3303 TREE_ASM_WRITTEN (exp
) = 1;
3305 /* If the constant is part of an object block, make sure that the
3306 decl has been positioned within its block, but do not write out
3307 its definition yet. output_object_blocks will do that later. */
3308 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3309 place_block_symbol (symbol
);
3312 switch_to_section (get_constant_section (exp
));
3313 align
= get_constant_alignment (exp
);
3314 if (align
> BITS_PER_UNIT
)
3315 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3316 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3319 mudflap_enqueue_constant (exp
);
3322 /* Look up EXP in the table of constant descriptors. Return the rtl
3323 if it has been emitted, else null. */
3326 lookup_constant_def (tree exp
)
3328 struct constant_descriptor_tree
*desc
;
3329 struct constant_descriptor_tree key
;
3332 key
.hash
= const_hash_1 (exp
);
3333 desc
= htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3335 return (desc
? desc
->rtl
: NULL_RTX
);
3338 /* Used in the hash tables to avoid outputting the same constant
3339 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3340 are output once per function, not once per file. */
3341 /* ??? Only a few targets need per-function constant pools. Most
3342 can use one per-file pool. Should add a targetm bit to tell the
3345 struct rtx_constant_pool
GTY(())
3347 /* Pointers to first and last constant in pool, as ordered by offset. */
3348 struct constant_descriptor_rtx
*first
;
3349 struct constant_descriptor_rtx
*last
;
3351 /* Hash facility for making memory-constants from constant rtl-expressions.
3352 It is used on RISC machines where immediate integer arguments and
3353 constant addresses are restricted so that such constants must be stored
3355 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3357 /* Current offset in constant pool (does not include any
3358 machine-specific header). */
3359 HOST_WIDE_INT offset
;
3362 struct constant_descriptor_rtx
GTY((chain_next ("%h.next")))
3364 struct constant_descriptor_rtx
*next
;
3368 HOST_WIDE_INT offset
;
3370 enum machine_mode mode
;
3376 /* Hash and compare functions for const_rtx_htab. */
3379 const_desc_rtx_hash (const void *ptr
)
3381 const struct constant_descriptor_rtx
*desc
= ptr
;
3386 const_desc_rtx_eq (const void *a
, const void *b
)
3388 const struct constant_descriptor_rtx
*x
= a
;
3389 const struct constant_descriptor_rtx
*y
= b
;
3391 if (x
->mode
!= y
->mode
)
3393 return rtx_equal_p (x
->constant
, y
->constant
);
3396 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3399 const_rtx_hash_1 (rtx
*xp
, void *data
)
3401 unsigned HOST_WIDE_INT hwi
;
3402 enum machine_mode mode
;
3408 code
= GET_CODE (x
);
3409 mode
= GET_MODE (x
);
3410 h
= (hashval_t
) code
* 1048573 + mode
;
3418 const int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3419 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3422 h
^= (hashval_t
) hwi
;
3423 for (i
= 1; i
< n
; ++i
)
3426 h
^= (hashval_t
) hwi
;
3432 if (mode
== VOIDmode
)
3434 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3438 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3442 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3448 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3449 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3454 h
^= htab_hash_string (XSTR (x
, 0));
3458 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3462 case UNSPEC_VOLATILE
:
3463 h
= h
* 251 + XINT (x
, 1);
3471 *hp
= *hp
* 509 + h
;
3475 /* Compute a hash value for X, which should be a constant. */
3478 const_rtx_hash (rtx x
)
3481 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3486 /* Create and return a new rtx constant pool. */
3488 static struct rtx_constant_pool
*
3489 create_constant_pool (void)
3491 struct rtx_constant_pool
*pool
;
3493 pool
= ggc_alloc (sizeof (struct rtx_constant_pool
));
3494 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3495 const_desc_rtx_eq
, NULL
);
3502 /* Initialize constant pool hashing for a new function. */
3505 init_varasm_status (void)
3507 crtl
->varasm
.pool
= create_constant_pool ();
3508 crtl
->varasm
.deferred_constants
= 0;
3511 /* Given a MINUS expression, simplify it if both sides
3512 include the same symbol. */
3515 simplify_subtraction (rtx x
)
3517 rtx r
= simplify_rtx (x
);
3521 /* Given a constant rtx X, make (or find) a memory constant for its value
3522 and return a MEM rtx to refer to it in memory. */
3525 force_const_mem (enum machine_mode mode
, rtx x
)
3527 struct constant_descriptor_rtx
*desc
, tmp
;
3528 struct rtx_constant_pool
*pool
;
3535 /* If we're not allowed to drop X into the constant pool, don't. */
3536 if (targetm
.cannot_force_const_mem (x
))
3539 /* Record that this function has used a constant pool entry. */
3540 crtl
->uses_const_pool
= 1;
3542 /* Decide which pool to use. */
3543 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3544 ? shared_constant_pool
3545 : crtl
->varasm
.pool
);
3547 /* Lookup the value in the hashtable. */
3550 hash
= const_rtx_hash (x
);
3551 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3554 /* If the constant was already present, return its memory. */
3556 return copy_rtx (desc
->mem
);
3558 /* Otherwise, create a new descriptor. */
3559 desc
= ggc_alloc (sizeof (*desc
));
3562 /* Align the location counter as required by EXP's data type. */
3563 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3564 #ifdef CONSTANT_ALIGNMENT
3566 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3567 if (type
!= NULL_TREE
)
3568 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3572 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3573 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3576 desc
->constant
= tmp
.constant
;
3577 desc
->offset
= pool
->offset
;
3580 desc
->align
= align
;
3581 desc
->labelno
= const_labelno
;
3584 pool
->offset
+= GET_MODE_SIZE (mode
);
3586 pool
->last
->next
= desc
;
3588 pool
->first
= pool
->last
= desc
;
3591 /* Create a string containing the label name, in LABEL. */
3592 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3595 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3596 the constants pool. */
3597 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3599 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3600 symbol
= create_block_symbol (ggc_strdup (label
),
3601 get_block_for_section (sect
), -1);
3604 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3606 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3607 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3608 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3610 /* Construct the MEM. */
3611 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3612 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3613 set_mem_align (def
, align
);
3615 /* If we're dropping a label to the constant pool, make sure we
3617 if (GET_CODE (x
) == LABEL_REF
)
3618 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3620 return copy_rtx (def
);
3623 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3626 get_pool_constant (rtx addr
)
3628 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3631 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3632 and whether it has been output or not. */
3635 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3637 struct constant_descriptor_rtx
*desc
;
3639 desc
= SYMBOL_REF_CONSTANT (addr
);
3640 *pmarked
= (desc
->mark
!= 0);
3641 return desc
->constant
;
3644 /* Similar, return the mode. */
3647 get_pool_mode (const_rtx addr
)
3649 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3652 /* Return the size of the constant pool. */
3655 get_pool_size (void)
3657 return crtl
->varasm
.pool
->offset
;
3660 /* Worker function for output_constant_pool_1. Emit assembly for X
3661 in MODE with known alignment ALIGN. */
3664 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3666 switch (GET_MODE_CLASS (mode
))
3669 case MODE_DECIMAL_FLOAT
:
3673 gcc_assert (GET_CODE (x
) == CONST_DOUBLE
);
3674 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3675 assemble_real (r
, mode
, align
);
3680 case MODE_PARTIAL_INT
:
3685 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3688 case MODE_VECTOR_FLOAT
:
3689 case MODE_VECTOR_INT
:
3690 case MODE_VECTOR_FRACT
:
3691 case MODE_VECTOR_UFRACT
:
3692 case MODE_VECTOR_ACCUM
:
3693 case MODE_VECTOR_UACCUM
:
3696 enum machine_mode submode
= GET_MODE_INNER (mode
);
3697 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3699 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3700 units
= CONST_VECTOR_NUNITS (x
);
3702 for (i
= 0; i
< units
; i
++)
3704 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3705 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3715 /* Worker function for output_constant_pool. Emit constant DESC,
3716 giving it ALIGN bits of alignment. */
3719 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3726 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3727 whose CODE_LABEL has been deleted. This can occur if a jump table
3728 is eliminated by optimization. If so, write a constant of zero
3729 instead. Note that this can also happen by turning the
3730 CODE_LABEL into a NOTE. */
3731 /* ??? This seems completely and utterly wrong. Certainly it's
3732 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3733 functioning even with INSN_DELETED_P and friends. */
3736 switch (GET_CODE (tmp
))
3739 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3740 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3742 tmp
= XEXP (XEXP (tmp
, 0), 0);
3746 tmp
= XEXP (tmp
, 0);
3747 gcc_assert (!INSN_DELETED_P (tmp
));
3748 gcc_assert (!NOTE_P (tmp
)
3749 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3756 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3757 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3758 align
, desc
->labelno
, done
);
3761 assemble_align (align
);
3763 /* Output the label. */
3764 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3766 /* Output the data. */
3767 output_constant_pool_2 (desc
->mode
, x
, align
);
3769 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3770 sections have proper size. */
3771 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3773 && (in_section
->common
.flags
& SECTION_MERGE
))
3774 assemble_align (align
);
3776 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3782 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3783 to as used. Emit referenced deferred strings. This function can
3784 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3787 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3789 rtx x
= *current_rtx
;
3791 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3794 if (CONSTANT_POOL_ADDRESS_P (x
))
3796 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3797 if (desc
->mark
== 0)
3800 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3803 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3805 tree exp
= SYMBOL_REF_DECL (x
);
3806 if (!TREE_ASM_WRITTEN (exp
))
3808 n_deferred_constants
--;
3809 output_constant_def_contents (x
);
3816 /* Look through appropriate parts of INSN, marking all entries in the
3817 constant pool which are actually being used. Entries that are only
3818 referenced by other constants are also marked as used. Emit
3819 deferred strings that are used. */
3822 mark_constants (rtx insn
)
3827 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3828 insns, not any notes that may be attached. We don't want to mark
3829 a constant just because it happens to appear in a REG_EQUIV note. */
3830 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3832 rtx seq
= PATTERN (insn
);
3833 int i
, n
= XVECLEN (seq
, 0);
3834 for (i
= 0; i
< n
; ++i
)
3836 rtx subinsn
= XVECEXP (seq
, 0, i
);
3837 if (INSN_P (subinsn
))
3838 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3842 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3845 /* Look through the instructions for this function, and mark all the
3846 entries in POOL which are actually being used. Emit deferred constants
3847 which have indeed been used. */
3850 mark_constant_pool (void)
3854 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3857 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3858 mark_constants (insn
);
3860 for (link
= crtl
->epilogue_delay_list
;
3862 link
= XEXP (link
, 1))
3863 mark_constants (XEXP (link
, 0));
3866 /* Write all the constants in POOL. */
3869 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3871 struct constant_descriptor_rtx
*desc
;
3873 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3876 /* If the constant is part of an object_block, make sure that
3877 the constant has been positioned within its block, but do not
3878 write out its definition yet. output_object_blocks will do
3880 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3881 && SYMBOL_REF_BLOCK (desc
->sym
))
3882 place_block_symbol (desc
->sym
);
3885 switch_to_section (targetm
.asm_out
.select_rtx_section
3886 (desc
->mode
, desc
->constant
, desc
->align
));
3887 output_constant_pool_1 (desc
, desc
->align
);
3892 /* Mark all constants that are used in the current function, then write
3893 out the function's private constant pool. */
3896 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3897 tree fndecl ATTRIBUTE_UNUSED
)
3899 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3901 /* It is possible for gcc to call force_const_mem and then to later
3902 discard the instructions which refer to the constant. In such a
3903 case we do not need to output the constant. */
3904 mark_constant_pool ();
3906 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3907 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3910 output_constant_pool_contents (pool
);
3912 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3913 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3917 /* Write the contents of the shared constant pool. */
3920 output_shared_constant_pool (void)
3922 output_constant_pool_contents (shared_constant_pool
);
3925 /* Determine what kind of relocations EXP may need. */
3928 compute_reloc_for_constant (tree exp
)
3930 int reloc
= 0, reloc2
;
3933 switch (TREE_CODE (exp
))
3937 /* Go inside any operations that get_inner_reference can handle and see
3938 if what's inside is a constant: no need to do anything here for
3939 addresses of variables or functions. */
3940 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3941 tem
= TREE_OPERAND (tem
, 0))
3944 if (TREE_PUBLIC (tem
))
3951 case POINTER_PLUS_EXPR
:
3952 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3953 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3957 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3958 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3959 /* The difference of two local labels is computable at link time. */
3960 if (reloc
== 1 && reloc2
== 1)
3967 case VIEW_CONVERT_EXPR
:
3968 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3973 unsigned HOST_WIDE_INT idx
;
3974 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3976 reloc
|= compute_reloc_for_constant (tem
);
3986 /* Find all the constants whose addresses are referenced inside of EXP,
3987 and make sure assembler code with a label has been output for each one.
3988 Indicate whether an ADDR_EXPR has been encountered. */
3991 output_addressed_constants (tree exp
)
3995 switch (TREE_CODE (exp
))
3999 /* Go inside any operations that get_inner_reference can handle and see
4000 if what's inside is a constant: no need to do anything here for
4001 addresses of variables or functions. */
4002 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4003 tem
= TREE_OPERAND (tem
, 0))
4006 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4007 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4008 tem
= DECL_INITIAL (tem
);
4010 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4011 output_constant_def (tem
, 0);
4015 case POINTER_PLUS_EXPR
:
4017 output_addressed_constants (TREE_OPERAND (exp
, 1));
4021 case VIEW_CONVERT_EXPR
:
4022 output_addressed_constants (TREE_OPERAND (exp
, 0));
4027 unsigned HOST_WIDE_INT idx
;
4028 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4030 output_addressed_constants (tem
);
4039 /* Whether a constructor CTOR is a valid static constant initializer if all
4040 its elements are. This used to be internal to initializer_constant_valid_p
4041 and has been exposed to let other functions like categorize_ctor_elements
4042 evaluate the property while walking a constructor for other purposes. */
4045 constructor_static_from_elts_p (const_tree ctor
)
4047 return (TREE_CONSTANT (ctor
)
4048 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4049 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
)
4050 && !VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (ctor
)));
4053 /* Return nonzero if VALUE is a valid constant-valued expression
4054 for use in initializing a static variable; one that can be an
4055 element of a "constant" initializer.
4057 Return null_pointer_node if the value is absolute;
4058 if it is relocatable, return the variable that determines the relocation.
4059 We assume that VALUE has been folded as much as possible;
4060 therefore, we do not need to check for such things as
4061 arithmetic-combinations of integers. */
4064 initializer_constant_valid_p (tree value
, tree endtype
)
4066 switch (TREE_CODE (value
))
4069 if (constructor_static_from_elts_p (value
))
4071 unsigned HOST_WIDE_INT idx
;
4073 bool absolute
= true;
4075 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4078 reloc
= initializer_constant_valid_p (elt
, TREE_TYPE (elt
));
4081 if (reloc
!= null_pointer_node
)
4084 /* For a non-absolute relocation, there is no single
4085 variable that can be "the variable that determines the
4087 return absolute
? null_pointer_node
: error_mark_node
;
4090 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4098 return null_pointer_node
;
4103 tree op0
= staticp (TREE_OPERAND (value
, 0));
4106 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4107 to be a constant, this is old-skool offsetof-like nonsense. */
4108 if (TREE_CODE (op0
) == INDIRECT_REF
4109 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4110 return null_pointer_node
;
4111 /* Taking the address of a nested function involves a trampoline,
4112 unless we don't need or want one. */
4113 if (TREE_CODE (op0
) == FUNCTION_DECL
4114 && decl_function_context (op0
)
4115 && !DECL_NO_STATIC_CHAIN (op0
)
4116 && !TREE_NO_TRAMPOLINE (value
))
4118 /* "&{...}" requires a temporary to hold the constructed
4120 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4126 case VIEW_CONVERT_EXPR
:
4127 case NON_LVALUE_EXPR
:
4128 return initializer_constant_valid_p (TREE_OPERAND (value
, 0), endtype
);
4136 src
= TREE_OPERAND (value
, 0);
4137 src_type
= TREE_TYPE (src
);
4138 dest_type
= TREE_TYPE (value
);
4140 /* Allow conversions between pointer types, floating-point
4141 types, and offset types. */
4142 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4143 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4144 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4145 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4146 return initializer_constant_valid_p (src
, endtype
);
4148 /* Allow length-preserving conversions between integer types. */
4149 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4150 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4151 return initializer_constant_valid_p (src
, endtype
);
4153 /* Allow conversions between other integer types only if
4155 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4157 tree inner
= initializer_constant_valid_p (src
, endtype
);
4158 if (inner
== null_pointer_node
)
4159 return null_pointer_node
;
4163 /* Allow (int) &foo provided int is as wide as a pointer. */
4164 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4165 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4166 return initializer_constant_valid_p (src
, endtype
);
4168 /* Likewise conversions from int to pointers, but also allow
4169 conversions from 0. */
4170 if ((POINTER_TYPE_P (dest_type
)
4171 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4172 && INTEGRAL_TYPE_P (src_type
))
4174 if (TREE_CODE (src
) == INTEGER_CST
4175 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4176 return null_pointer_node
;
4177 if (integer_zerop (src
))
4178 return null_pointer_node
;
4179 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4180 return initializer_constant_valid_p (src
, endtype
);
4183 /* Allow conversions to struct or union types if the value
4185 if (TREE_CODE (dest_type
) == RECORD_TYPE
4186 || TREE_CODE (dest_type
) == UNION_TYPE
)
4187 return initializer_constant_valid_p (src
, endtype
);
4191 case POINTER_PLUS_EXPR
:
4193 if (! INTEGRAL_TYPE_P (endtype
)
4194 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4196 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4198 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4200 /* If either term is absolute, use the other term's relocation. */
4201 if (valid0
== null_pointer_node
)
4203 if (valid1
== null_pointer_node
)
4209 if (! INTEGRAL_TYPE_P (endtype
)
4210 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4212 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4214 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4216 /* Win if second argument is absolute. */
4217 if (valid1
== null_pointer_node
)
4219 /* Win if both arguments have the same relocation.
4220 Then the value is absolute. */
4221 if (valid0
== valid1
&& valid0
!= 0)
4222 return null_pointer_node
;
4224 /* Since GCC guarantees that string constants are unique in the
4225 generated code, a subtraction between two copies of the same
4226 constant string is absolute. */
4227 if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4228 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4229 && operand_equal_p (valid0
, valid1
, 1))
4230 return null_pointer_node
;
4233 /* Support narrowing differences. */
4234 if (INTEGRAL_TYPE_P (endtype
))
4238 op0
= TREE_OPERAND (value
, 0);
4239 op1
= TREE_OPERAND (value
, 1);
4241 /* Like STRIP_NOPS except allow the operand mode to widen.
4242 This works around a feature of fold that simplifies
4243 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
4244 that the narrower operation is cheaper. */
4246 while (CONVERT_EXPR_P (op0
)
4247 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4249 tree inner
= TREE_OPERAND (op0
, 0);
4250 if (inner
== error_mark_node
4251 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4252 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4253 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4258 while (CONVERT_EXPR_P (op1
)
4259 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4261 tree inner
= TREE_OPERAND (op1
, 0);
4262 if (inner
== error_mark_node
4263 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4264 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4265 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4270 op0
= initializer_constant_valid_p (op0
, endtype
);
4271 op1
= initializer_constant_valid_p (op1
, endtype
);
4273 /* Both initializers must be known. */
4277 return null_pointer_node
;
4279 /* Support differences between labels. */
4280 if (TREE_CODE (op0
) == LABEL_DECL
4281 && TREE_CODE (op1
) == LABEL_DECL
)
4282 return null_pointer_node
;
4284 if (TREE_CODE (op0
) == STRING_CST
4285 && TREE_CODE (op1
) == STRING_CST
4286 && operand_equal_p (op0
, op1
, 1))
4287 return null_pointer_node
;
4299 /* Output assembler code for constant EXP to FILE, with no label.
4300 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4301 Assumes output_addressed_constants has been done on EXP already.
4303 Generate exactly SIZE bytes of assembler data, padding at the end
4304 with zeros if necessary. SIZE must always be specified.
4306 SIZE is important for structure constructors,
4307 since trailing members may have been omitted from the constructor.
4308 It is also important for initialization of arrays from string constants
4309 since the full length of the string constant might not be wanted.
4310 It is also needed for initialization of unions, where the initializer's
4311 type is just one member, and that may not be as long as the union.
4313 There a case in which we would fail to output exactly SIZE bytes:
4314 for a structure constructor that wants to produce more than SIZE bytes.
4315 But such constructors will never be generated for any possible input.
4317 ALIGN is the alignment of the data in bits. */
4320 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4322 enum tree_code code
;
4323 unsigned HOST_WIDE_INT thissize
;
4325 if (size
== 0 || flag_syntax_only
)
4328 /* See if we're trying to initialize a pointer in a non-default mode
4329 to the address of some declaration somewhere. If the target says
4330 the mode is valid for pointers, assume the target has a way of
4332 if (TREE_CODE (exp
) == NOP_EXPR
4333 && POINTER_TYPE_P (TREE_TYPE (exp
))
4334 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4336 tree saved_type
= TREE_TYPE (exp
);
4338 /* Peel off any intermediate conversions-to-pointer for valid
4340 while (TREE_CODE (exp
) == NOP_EXPR
4341 && POINTER_TYPE_P (TREE_TYPE (exp
))
4342 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4343 exp
= TREE_OPERAND (exp
, 0);
4345 /* If what we're left with is the address of something, we can
4346 convert the address to the final type and output it that
4348 if (TREE_CODE (exp
) == ADDR_EXPR
)
4349 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4350 /* Likewise for constant ints. */
4351 else if (TREE_CODE (exp
) == INTEGER_CST
)
4352 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4353 TREE_INT_CST_HIGH (exp
));
4357 /* Eliminate any conversions since we'll be outputting the underlying
4359 while (CONVERT_EXPR_P (exp
)
4360 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4361 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4363 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4364 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4366 /* Make sure eliminating the conversion is really a no-op, except with
4367 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4368 union types to allow for Ada unchecked unions. */
4369 if (type_size
> op_size
4370 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4371 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4372 /* Keep the conversion. */
4375 exp
= TREE_OPERAND (exp
, 0);
4378 code
= TREE_CODE (TREE_TYPE (exp
));
4379 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4381 /* Allow a constructor with no elements for any data type.
4382 This means to fill the space with zeros. */
4383 if (TREE_CODE (exp
) == CONSTRUCTOR
4384 && VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (exp
)))
4386 assemble_zeros (size
);
4390 if (TREE_CODE (exp
) == FDESC_EXPR
)
4392 #ifdef ASM_OUTPUT_FDESC
4393 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4394 tree decl
= TREE_OPERAND (exp
, 0);
4395 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4402 /* Now output the underlying data. If we've handling the padding, return.
4403 Otherwise, break and ensure SIZE is the size written. */
4410 case REFERENCE_TYPE
:
4412 case FIXED_POINT_TYPE
:
4413 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4414 EXPAND_INITIALIZER
),
4415 MIN (size
, thissize
), align
, 0))
4416 error ("initializer for integer/fixed-point value is too complicated");
4420 if (TREE_CODE (exp
) != REAL_CST
)
4421 error ("initializer for floating value is not a floating constant");
4423 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4427 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4428 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4429 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4434 switch (TREE_CODE (exp
))
4437 output_constructor (exp
, size
, align
);
4440 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4442 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4449 unsigned int nalign
;
4450 enum machine_mode inner
;
4452 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4453 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4455 elt_size
= GET_MODE_SIZE (inner
);
4457 link
= TREE_VECTOR_CST_ELTS (exp
);
4458 output_constant (TREE_VALUE (link
), elt_size
, align
);
4459 thissize
= elt_size
;
4460 while ((link
= TREE_CHAIN (link
)) != NULL
)
4462 output_constant (TREE_VALUE (link
), elt_size
, nalign
);
4463 thissize
+= elt_size
;
4474 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4475 output_constructor (exp
, size
, align
);
4485 if (size
> thissize
)
4486 assemble_zeros (size
- thissize
);
4490 /* Subroutine of output_constructor, used for computing the size of
4491 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4492 type with an unspecified upper bound. */
4494 static unsigned HOST_WIDE_INT
4495 array_size_for_constructor (tree val
)
4498 unsigned HOST_WIDE_INT cnt
;
4499 tree index
, value
, tmp
;
4501 /* This code used to attempt to handle string constants that are not
4502 arrays of single-bytes, but nothing else does, so there's no point in
4504 if (TREE_CODE (val
) == STRING_CST
)
4505 return TREE_STRING_LENGTH (val
);
4507 max_index
= NULL_TREE
;
4508 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4510 if (TREE_CODE (index
) == RANGE_EXPR
)
4511 index
= TREE_OPERAND (index
, 1);
4512 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4516 if (max_index
== NULL_TREE
)
4519 /* Compute the total number of array elements. */
4520 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4521 i
= size_binop (MINUS_EXPR
, fold_convert (sizetype
, max_index
),
4522 fold_convert (sizetype
, tmp
));
4523 i
= size_binop (PLUS_EXPR
, i
, build_int_cst (sizetype
, 1));
4525 /* Multiply by the array element unit size to find number of bytes. */
4526 i
= size_binop (MULT_EXPR
, i
, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4528 return tree_low_cst (i
, 1);
4531 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4532 Generate at least SIZE bytes, padding if necessary. */
4535 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
4538 tree type
= TREE_TYPE (exp
);
4541 /* Number of bytes output or skipped so far.
4542 In other words, current position within the constructor. */
4543 HOST_WIDE_INT total_bytes
= 0;
4544 /* Nonzero means BYTE contains part of a byte, to be output. */
4545 int byte_buffer_in_use
= 0;
4547 unsigned HOST_WIDE_INT cnt
;
4548 constructor_elt
*ce
;
4550 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
4552 if (TREE_CODE (type
) == RECORD_TYPE
)
4553 field
= TYPE_FIELDS (type
);
4555 if (TREE_CODE (type
) == ARRAY_TYPE
4556 && TYPE_DOMAIN (type
) != 0)
4557 min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (type
));
4559 /* As LINK goes through the elements of the constant,
4560 FIELD goes through the structure fields, if the constant is a structure.
4561 if the constant is a union, then we override this,
4562 by getting the field from the TREE_LIST element.
4563 But the constant could also be an array. Then FIELD is zero.
4565 There is always a maximum of one element in the chain LINK for unions
4566 (even if the initializer in a source program incorrectly contains
4569 VEC_iterate (constructor_elt
, CONSTRUCTOR_ELTS (exp
), cnt
, ce
);
4570 cnt
++, field
= field
? TREE_CHAIN (field
) : 0)
4572 tree val
= ce
->value
;
4575 /* The element in a union constructor specifies the proper field
4577 if ((TREE_CODE (type
) == RECORD_TYPE
|| TREE_CODE (type
) == UNION_TYPE
4578 || TREE_CODE (type
) == QUAL_UNION_TYPE
)
4582 else if (TREE_CODE (type
) == ARRAY_TYPE
)
4585 #ifdef ASM_COMMENT_START
4586 if (field
&& flag_verbose_asm
)
4587 fprintf (asm_out_file
, "%s %s:\n",
4590 ? IDENTIFIER_POINTER (DECL_NAME (field
))
4594 /* Eliminate the marker that makes a cast not be an lvalue. */
4598 if (index
&& TREE_CODE (index
) == RANGE_EXPR
)
4600 unsigned HOST_WIDE_INT fieldsize
4601 = int_size_in_bytes (TREE_TYPE (type
));
4602 HOST_WIDE_INT lo_index
= tree_low_cst (TREE_OPERAND (index
, 0), 0);
4603 HOST_WIDE_INT hi_index
= tree_low_cst (TREE_OPERAND (index
, 1), 0);
4604 HOST_WIDE_INT index
;
4605 unsigned int align2
= min_align (align
, fieldsize
* BITS_PER_UNIT
);
4607 for (index
= lo_index
; index
<= hi_index
; index
++)
4609 /* Output the element's initial value. */
4611 assemble_zeros (fieldsize
);
4613 output_constant (val
, fieldsize
, align2
);
4615 /* Count its size. */
4616 total_bytes
+= fieldsize
;
4619 else if (field
== 0 || !DECL_BIT_FIELD (field
))
4621 /* An element that is not a bit-field. */
4623 unsigned HOST_WIDE_INT fieldsize
;
4624 /* Since this structure is static,
4625 we know the positions are constant. */
4626 HOST_WIDE_INT pos
= field
? int_byte_position (field
) : 0;
4627 unsigned int align2
;
4630 pos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val
)), 1)
4631 * (tree_low_cst (index
, 0) - tree_low_cst (min_index
, 0)));
4633 /* Output any buffered-up bit-fields preceding this element. */
4634 if (byte_buffer_in_use
)
4636 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4638 byte_buffer_in_use
= 0;
4641 /* Advance to offset of this element.
4642 Note no alignment needed in an array, since that is guaranteed
4643 if each element has the proper size. */
4644 if ((field
!= 0 || index
!= 0) && pos
!= total_bytes
)
4646 gcc_assert (pos
>= total_bytes
);
4647 assemble_zeros (pos
- total_bytes
);
4651 /* Find the alignment of this element. */
4652 align2
= min_align (align
, BITS_PER_UNIT
* pos
);
4654 /* Determine size this element should occupy. */
4659 /* If this is an array with an unspecified upper bound,
4660 the initializer determines the size. */
4661 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4662 but we cannot do this until the deprecated support for
4663 initializing zero-length array members is removed. */
4664 if (TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
4665 && TYPE_DOMAIN (TREE_TYPE (field
))
4666 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field
))))
4668 fieldsize
= array_size_for_constructor (val
);
4669 /* Given a non-empty initialization, this field had
4671 gcc_assert (!fieldsize
|| !TREE_CHAIN (field
));
4673 else if (DECL_SIZE_UNIT (field
))
4675 /* ??? This can't be right. If the decl size overflows
4676 a host integer we will silently emit no data. */
4677 if (host_integerp (DECL_SIZE_UNIT (field
), 1))
4678 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (field
), 1);
4682 fieldsize
= int_size_in_bytes (TREE_TYPE (type
));
4684 /* Output the element's initial value. */
4686 assemble_zeros (fieldsize
);
4688 output_constant (val
, fieldsize
, align2
);
4690 /* Count its size. */
4691 total_bytes
+= fieldsize
;
4693 else if (val
!= 0 && TREE_CODE (val
) != INTEGER_CST
)
4694 error ("invalid initial value for member %qs",
4695 IDENTIFIER_POINTER (DECL_NAME (field
)));
4698 /* Element that is a bit-field. */
4700 HOST_WIDE_INT next_offset
= int_bit_position (field
);
4701 HOST_WIDE_INT end_offset
4702 = (next_offset
+ tree_low_cst (DECL_SIZE (field
), 1));
4705 val
= integer_zero_node
;
4707 /* If this field does not start in this (or, next) byte,
4709 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4711 /* Output remnant of any bit field in previous bytes. */
4712 if (byte_buffer_in_use
)
4714 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4716 byte_buffer_in_use
= 0;
4719 /* If still not at proper byte, advance to there. */
4720 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4722 gcc_assert (next_offset
/ BITS_PER_UNIT
>= total_bytes
);
4723 assemble_zeros (next_offset
/ BITS_PER_UNIT
- total_bytes
);
4724 total_bytes
= next_offset
/ BITS_PER_UNIT
;
4728 if (! byte_buffer_in_use
)
4731 /* We must split the element into pieces that fall within
4732 separate bytes, and combine each byte with previous or
4733 following bit-fields. */
4735 /* next_offset is the offset n fbits from the beginning of
4736 the structure to the next bit of this element to be processed.
4737 end_offset is the offset of the first bit past the end of
4739 while (next_offset
< end_offset
)
4743 HOST_WIDE_INT value
;
4744 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4745 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4747 /* Advance from byte to byte
4748 within this element when necessary. */
4749 while (next_byte
!= total_bytes
)
4751 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4756 /* Number of bits we can process at once
4757 (all part of the same byte). */
4758 this_time
= MIN (end_offset
- next_offset
,
4759 BITS_PER_UNIT
- next_bit
);
4760 if (BYTES_BIG_ENDIAN
)
4762 /* On big-endian machine, take the most significant bits
4763 first (of the bits that are significant)
4764 and put them into bytes from the most significant end. */
4765 shift
= end_offset
- next_offset
- this_time
;
4767 /* Don't try to take a bunch of bits that cross
4768 the word boundary in the INTEGER_CST. We can
4769 only select bits from the LOW or HIGH part
4771 if (shift
< HOST_BITS_PER_WIDE_INT
4772 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4774 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4775 shift
= HOST_BITS_PER_WIDE_INT
;
4778 /* Now get the bits from the appropriate constant word. */
4779 if (shift
< HOST_BITS_PER_WIDE_INT
)
4780 value
= TREE_INT_CST_LOW (val
);
4783 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4784 value
= TREE_INT_CST_HIGH (val
);
4785 shift
-= HOST_BITS_PER_WIDE_INT
;
4788 /* Get the result. This works only when:
4789 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4790 byte
|= (((value
>> shift
)
4791 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4792 << (BITS_PER_UNIT
- this_time
- next_bit
));
4796 /* On little-endian machines,
4797 take first the least significant bits of the value
4798 and pack them starting at the least significant
4799 bits of the bytes. */
4800 shift
= next_offset
- int_bit_position (field
);
4802 /* Don't try to take a bunch of bits that cross
4803 the word boundary in the INTEGER_CST. We can
4804 only select bits from the LOW or HIGH part
4806 if (shift
< HOST_BITS_PER_WIDE_INT
4807 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4808 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
4810 /* Now get the bits from the appropriate constant word. */
4811 if (shift
< HOST_BITS_PER_WIDE_INT
)
4812 value
= TREE_INT_CST_LOW (val
);
4815 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4816 value
= TREE_INT_CST_HIGH (val
);
4817 shift
-= HOST_BITS_PER_WIDE_INT
;
4820 /* Get the result. This works only when:
4821 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4822 byte
|= (((value
>> shift
)
4823 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4827 next_offset
+= this_time
;
4828 byte_buffer_in_use
= 1;
4833 if (byte_buffer_in_use
)
4835 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4839 if ((unsigned HOST_WIDE_INT
)total_bytes
< size
)
4840 assemble_zeros (size
- total_bytes
);
4843 /* This TREE_LIST contains any weak symbol declarations waiting
4845 static GTY(()) tree weak_decls
;
4847 /* Mark DECL as weak. */
4850 mark_weak (tree decl
)
4852 DECL_WEAK (decl
) = 1;
4854 if (DECL_RTL_SET_P (decl
)
4855 && MEM_P (DECL_RTL (decl
))
4856 && XEXP (DECL_RTL (decl
), 0)
4857 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
4858 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
4861 /* Merge weak status between NEWDECL and OLDDECL. */
4864 merge_weak (tree newdecl
, tree olddecl
)
4866 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
4868 if (DECL_WEAK (newdecl
) && SUPPORTS_WEAK
)
4871 /* We put the NEWDECL on the weak_decls list at some point
4872 and OLDDECL as well. Keep just OLDDECL on the list. */
4873 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
4874 if (TREE_VALUE (*pwd
) == newdecl
)
4876 *pwd
= TREE_CHAIN (*pwd
);
4883 if (DECL_WEAK (newdecl
))
4887 /* NEWDECL is weak, but OLDDECL is not. */
4889 /* If we already output the OLDDECL, we're in trouble; we can't
4890 go back and make it weak. This error cannot be caught in
4891 declare_weak because the NEWDECL and OLDDECL was not yet
4892 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4893 if (TREE_ASM_WRITTEN (olddecl
))
4894 error ("weak declaration of %q+D must precede definition",
4897 /* If we've already generated rtl referencing OLDDECL, we may
4898 have done so in a way that will not function properly with
4900 else if (TREE_USED (olddecl
)
4901 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)))
4902 warning (0, "weak declaration of %q+D after first use results "
4903 "in unspecified behavior", newdecl
);
4907 /* We put the NEWDECL on the weak_decls list at some point.
4908 Replace it with the OLDDECL. */
4909 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
4910 if (TREE_VALUE (wd
) == newdecl
)
4912 TREE_VALUE (wd
) = olddecl
;
4915 /* We may not find the entry on the list. If NEWDECL is a
4916 weak alias, then we will have already called
4917 globalize_decl to remove the entry; in that case, we do
4918 not need to do anything. */
4921 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4922 mark_weak (olddecl
);
4925 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4926 weak. Just update NEWDECL to indicate that it's weak too. */
4927 mark_weak (newdecl
);
4930 /* Declare DECL to be a weak symbol. */
4933 declare_weak (tree decl
)
4935 if (! TREE_PUBLIC (decl
))
4936 error ("weak declaration of %q+D must be public", decl
);
4937 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& TREE_ASM_WRITTEN (decl
))
4938 error ("weak declaration of %q+D must precede definition", decl
);
4939 else if (SUPPORTS_WEAK
)
4941 if (! DECL_WEAK (decl
))
4942 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
4945 warning (0, "weak declaration of %q+D not supported", decl
);
4951 weak_finish_1 (tree decl
)
4953 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4954 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
4957 if (! TREE_USED (decl
))
4960 #ifdef ASM_WEAKEN_DECL
4961 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
4963 #ifdef ASM_WEAKEN_LABEL
4964 ASM_WEAKEN_LABEL (asm_out_file
, name
);
4966 #ifdef ASM_OUTPUT_WEAK_ALIAS
4968 static bool warn_once
= 0;
4971 warning (0, "only weak aliases are supported in this configuration");
4981 /* This TREE_LIST contains weakref targets. */
4983 static GTY(()) tree weakref_targets
;
4985 /* Forward declaration. */
4986 static tree
find_decl_and_mark_needed (tree decl
, tree target
);
4988 /* Emit any pending weak declarations. */
4995 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
4997 tree alias_decl
= TREE_PURPOSE (t
);
4998 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5000 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5001 /* Remove alias_decl from the weak list, but leave entries for
5002 the target alone. */
5004 #ifndef ASM_OUTPUT_WEAKREF
5005 else if (! TREE_SYMBOL_REFERENCED (target
))
5007 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5008 defined, otherwise we and weak_finish_1 would use
5009 different macros. */
5010 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5011 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5013 tree decl
= find_decl_and_mark_needed (alias_decl
, target
);
5017 decl
= build_decl (TREE_CODE (alias_decl
), target
,
5018 TREE_TYPE (alias_decl
));
5020 DECL_EXTERNAL (decl
) = 1;
5021 TREE_PUBLIC (decl
) = 1;
5022 DECL_ARTIFICIAL (decl
) = 1;
5023 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5024 TREE_USED (decl
) = 1;
5027 weak_finish_1 (decl
);
5036 /* Remove the alias and the target from the pending weak list
5037 so that we do not emit any .weak directives for the former,
5038 nor multiple .weak directives for the latter. */
5039 for (p
= &weak_decls
; (t2
= *p
) ; )
5041 if (TREE_VALUE (t2
) == alias_decl
5042 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5043 *p
= TREE_CHAIN (t2
);
5045 p
= &TREE_CHAIN (t2
);
5048 /* Remove other weakrefs to the same target, to speed things up. */
5049 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5051 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5052 *p
= TREE_CHAIN (t2
);
5054 p
= &TREE_CHAIN (t2
);
5059 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5061 tree decl
= TREE_VALUE (t
);
5063 weak_finish_1 (decl
);
5067 /* Emit the assembly bits to indicate that DECL is globally visible. */
5070 globalize_decl (tree decl
)
5073 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5074 if (DECL_WEAK (decl
))
5076 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5079 #ifdef ASM_WEAKEN_DECL
5080 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5082 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5085 /* Remove this function from the pending weak list so that
5086 we do not emit multiple .weak directives for it. */
5087 for (p
= &weak_decls
; (t
= *p
) ; )
5089 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5090 *p
= TREE_CHAIN (t
);
5092 p
= &TREE_CHAIN (t
);
5095 /* Remove weakrefs to the same target from the pending weakref
5096 list, for the same reason. */
5097 for (p
= &weakref_targets
; (t
= *p
) ; )
5099 if (DECL_ASSEMBLER_NAME (decl
)
5100 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5101 *p
= TREE_CHAIN (t
);
5103 p
= &TREE_CHAIN (t
);
5110 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5113 /* We have to be able to tell cgraph about the needed-ness of the target
5114 of an alias. This requires that the decl have been defined. Aliases
5115 that precede their definition have to be queued for later processing. */
5117 typedef struct alias_pair
GTY(())
5123 /* Define gc'd vector type. */
5124 DEF_VEC_O(alias_pair
);
5125 DEF_VEC_ALLOC_O(alias_pair
,gc
);
5127 static GTY(()) VEC(alias_pair
,gc
) *alias_pairs
;
5129 /* Given an assembly name, find the decl it is associated with. At the
5130 same time, mark it needed for cgraph. */
5133 find_decl_and_mark_needed (tree decl
, tree target
)
5135 struct cgraph_node
*fnode
= NULL
;
5136 struct varpool_node
*vnode
= NULL
;
5138 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5140 fnode
= cgraph_node_for_asm (target
);
5142 vnode
= varpool_node_for_asm (target
);
5146 vnode
= varpool_node_for_asm (target
);
5148 fnode
= cgraph_node_for_asm (target
);
5153 /* We can't mark function nodes as used after cgraph global info
5154 is finished. This wouldn't generally be necessary, but C++
5155 virtual table thunks are introduced late in the game and
5156 might seem like they need marking, although in fact they
5158 if (! cgraph_global_info_ready
)
5159 cgraph_mark_needed_node (fnode
);
5164 varpool_mark_needed_node (vnode
);
5171 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5172 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5173 tree node is DECL to have the value of the tree node TARGET. */
5176 do_assemble_alias (tree decl
, tree target
)
5178 if (TREE_ASM_WRITTEN (decl
))
5181 TREE_ASM_WRITTEN (decl
) = 1;
5182 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5184 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5186 ultimate_transparent_alias_target (&target
);
5188 if (!targetm
.have_tls
5189 && TREE_CODE (decl
) == VAR_DECL
5190 && DECL_THREAD_LOCAL_P (decl
))
5192 decl
= emutls_decl (decl
);
5193 target
= get_emutls_object_name (target
);
5196 if (!TREE_SYMBOL_REFERENCED (target
))
5197 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5199 #ifdef ASM_OUTPUT_WEAKREF
5200 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5201 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5202 IDENTIFIER_POINTER (target
));
5206 error ("%Jweakref is not supported in this configuration", decl
);
5213 if (!targetm
.have_tls
5214 && TREE_CODE (decl
) == VAR_DECL
5215 && DECL_THREAD_LOCAL_P (decl
))
5217 decl
= emutls_decl (decl
);
5218 target
= get_emutls_object_name (target
);
5221 #ifdef ASM_OUTPUT_DEF
5222 /* Make name accessible from other files, if appropriate. */
5224 if (TREE_PUBLIC (decl
))
5226 globalize_decl (decl
);
5227 maybe_assemble_visibility (decl
);
5230 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5231 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5233 ASM_OUTPUT_DEF (asm_out_file
,
5234 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5235 IDENTIFIER_POINTER (target
));
5237 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5242 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5243 # ifdef ASM_WEAKEN_DECL
5244 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5246 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5248 /* Remove this function from the pending weak list so that
5249 we do not emit multiple .weak directives for it. */
5250 for (p
= &weak_decls
; (t
= *p
) ; )
5251 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5252 *p
= TREE_CHAIN (t
);
5254 p
= &TREE_CHAIN (t
);
5256 /* Remove weakrefs to the same target from the pending weakref
5257 list, for the same reason. */
5258 for (p
= &weakref_targets
; (t
= *p
) ; )
5260 if (DECL_ASSEMBLER_NAME (decl
)
5261 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5262 *p
= TREE_CHAIN (t
);
5264 p
= &TREE_CHAIN (t
);
5270 /* First pass of completing pending aliases. Make sure that cgraph knows
5271 which symbols will be required. */
5274 finish_aliases_1 (void)
5279 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5283 target_decl
= find_decl_and_mark_needed (p
->decl
, p
->target
);
5284 if (target_decl
== NULL
)
5286 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5287 error ("%q+D aliased to undefined symbol %qs",
5288 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5290 else if (DECL_EXTERNAL (target_decl
)
5291 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5292 error ("%q+D aliased to external symbol %qs",
5293 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5297 /* Second pass of completing pending aliases. Emit the actual assembly.
5298 This happens at the end of compilation and thus it is assured that the
5299 target symbol has been emitted. */
5302 finish_aliases_2 (void)
5307 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5308 do_assemble_alias (p
->decl
, p
->target
);
5310 VEC_truncate (alias_pair
, alias_pairs
, 0);
5313 /* Emit an assembler directive to make the symbol for DECL an alias to
5314 the symbol for TARGET. */
5317 assemble_alias (tree decl
, tree target
)
5320 bool is_weakref
= false;
5322 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5324 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5328 ultimate_transparent_alias_target (&target
);
5330 if (alias
== target
)
5331 error ("weakref %q+D ultimately targets itself", decl
);
5334 #ifndef ASM_OUTPUT_WEAKREF
5335 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5336 TREE_CHAIN (alias
) = target
;
5339 if (TREE_PUBLIC (decl
))
5340 error ("weakref %q+D must have static linkage", decl
);
5344 #if !defined (ASM_OUTPUT_DEF)
5345 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5346 error ("%Jalias definitions not supported in this configuration", decl
);
5349 if (!DECL_WEAK (decl
))
5351 error ("%Jonly weak aliases are supported in this configuration", decl
);
5358 /* We must force creation of DECL_RTL for debug info generation, even though
5359 we don't use it here. */
5360 make_decl_rtl (decl
);
5361 TREE_USED (decl
) = 1;
5363 /* A quirk of the initial implementation of aliases required that the user
5364 add "extern" to all of them. Which is silly, but now historical. Do
5365 note that the symbol is in fact locally defined. */
5367 DECL_EXTERNAL (decl
) = 0;
5369 /* Allow aliases to aliases. */
5370 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5371 cgraph_node (decl
)->alias
= true;
5373 varpool_node (decl
)->alias
= true;
5375 /* If the target has already been emitted, we don't have to queue the
5376 alias. This saves a tad of memory. */
5377 target_decl
= find_decl_and_mark_needed (decl
, target
);
5378 if (target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5379 do_assemble_alias (decl
, target
);
5382 alias_pair
*p
= VEC_safe_push (alias_pair
, gc
, alias_pairs
, NULL
);
5388 /* Emit an assembler directive to set symbol for DECL visibility to
5389 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5392 default_assemble_visibility (tree decl
, int vis
)
5394 static const char * const visibility_types
[] = {
5395 NULL
, "protected", "hidden", "internal"
5398 const char *name
, *type
;
5400 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5401 type
= visibility_types
[vis
];
5403 #ifdef HAVE_GAS_HIDDEN
5404 fprintf (asm_out_file
, "\t.%s\t", type
);
5405 assemble_name (asm_out_file
, name
);
5406 fprintf (asm_out_file
, "\n");
5408 warning (OPT_Wattributes
, "visibility attribute not supported "
5409 "in this configuration; ignored");
5413 /* A helper function to call assemble_visibility when needed for a decl. */
5416 maybe_assemble_visibility (tree decl
)
5418 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5420 if (vis
!= VISIBILITY_DEFAULT
)
5422 targetm
.asm_out
.visibility (decl
, vis
);
5429 /* Returns 1 if the target configuration supports defining public symbols
5430 so that one of them will be chosen at link time instead of generating a
5431 multiply-defined symbol error, whether through the use of weak symbols or
5432 a target-specific mechanism for having duplicates discarded. */
5435 supports_one_only (void)
5437 if (SUPPORTS_ONE_ONLY
)
5439 return SUPPORTS_WEAK
;
5442 /* Set up DECL as a public symbol that can be defined in multiple
5443 translation units without generating a linker error. */
5446 make_decl_one_only (tree decl
)
5448 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5449 || TREE_CODE (decl
) == FUNCTION_DECL
);
5451 TREE_PUBLIC (decl
) = 1;
5453 if (SUPPORTS_ONE_ONLY
)
5455 #ifdef MAKE_DECL_ONE_ONLY
5456 MAKE_DECL_ONE_ONLY (decl
);
5458 DECL_ONE_ONLY (decl
) = 1;
5460 else if (TREE_CODE (decl
) == VAR_DECL
5461 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5462 DECL_COMMON (decl
) = 1;
5465 gcc_assert (SUPPORTS_WEAK
);
5466 DECL_WEAK (decl
) = 1;
5471 init_varasm_once (void)
5473 section_htab
= htab_create_ggc (31, section_entry_hash
,
5474 section_entry_eq
, NULL
);
5475 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5476 object_block_entry_eq
, NULL
);
5477 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5478 const_desc_eq
, NULL
);
5480 const_alias_set
= new_alias_set ();
5481 shared_constant_pool
= create_constant_pool ();
5483 #ifdef TEXT_SECTION_ASM_OP
5484 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5485 TEXT_SECTION_ASM_OP
);
5488 #ifdef DATA_SECTION_ASM_OP
5489 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5490 DATA_SECTION_ASM_OP
);
5493 #ifdef SDATA_SECTION_ASM_OP
5494 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5495 SDATA_SECTION_ASM_OP
);
5498 #ifdef READONLY_DATA_SECTION_ASM_OP
5499 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5500 READONLY_DATA_SECTION_ASM_OP
);
5503 #ifdef CTORS_SECTION_ASM_OP
5504 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5505 CTORS_SECTION_ASM_OP
);
5508 #ifdef DTORS_SECTION_ASM_OP
5509 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5510 DTORS_SECTION_ASM_OP
);
5513 #ifdef BSS_SECTION_ASM_OP
5514 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5515 output_section_asm_op
,
5516 BSS_SECTION_ASM_OP
);
5519 #ifdef SBSS_SECTION_ASM_OP
5520 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5521 output_section_asm_op
,
5522 SBSS_SECTION_ASM_OP
);
5525 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5526 | SECTION_COMMON
, emit_tls_common
);
5527 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5528 | SECTION_COMMON
, emit_local
);
5529 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5530 | SECTION_COMMON
, emit_common
);
5532 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5533 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5537 targetm
.asm_out
.init_sections ();
5539 if (readonly_data_section
== NULL
)
5540 readonly_data_section
= text_section
;
5544 decl_default_tls_model (const_tree decl
)
5546 enum tls_model kind
;
5549 is_local
= targetm
.binds_local_p (decl
);
5553 kind
= TLS_MODEL_LOCAL_EXEC
;
5555 kind
= TLS_MODEL_INITIAL_EXEC
;
5558 /* Local dynamic is inefficient when we're not combining the
5559 parts of the address. */
5560 else if (optimize
&& is_local
)
5561 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5563 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5564 if (kind
< flag_tls_default
)
5565 kind
= flag_tls_default
;
5570 /* Select a set of attributes for section NAME based on the properties
5571 of DECL and whether or not RELOC indicates that DECL's initializer
5572 might contain runtime relocations.
5574 We make the section read-only and executable for a function decl,
5575 read-only for a const data decl, and writable for a non-const data decl. */
5578 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5582 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5583 flags
= SECTION_CODE
;
5584 else if (decl
&& decl_readonly_section (decl
, reloc
))
5586 else if (current_function_decl
5588 && crtl
->subsections
.unlikely_text_section_name
5589 && strcmp (name
, crtl
->subsections
.unlikely_text_section_name
) == 0)
5590 flags
= SECTION_CODE
;
5592 && (!current_function_decl
|| !cfun
)
5593 && strcmp (name
, UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
5594 flags
= SECTION_CODE
;
5596 flags
= SECTION_WRITE
;
5598 if (decl
&& DECL_ONE_ONLY (decl
))
5599 flags
|= SECTION_LINKONCE
;
5601 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5602 flags
|= SECTION_TLS
| SECTION_WRITE
;
5604 if (strcmp (name
, ".bss") == 0
5605 || strncmp (name
, ".bss.", 5) == 0
5606 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
5607 || strcmp (name
, ".sbss") == 0
5608 || strncmp (name
, ".sbss.", 6) == 0
5609 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
5610 flags
|= SECTION_BSS
;
5612 if (strcmp (name
, ".tdata") == 0
5613 || strncmp (name
, ".tdata.", 7) == 0
5614 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
5615 flags
|= SECTION_TLS
;
5617 if (strcmp (name
, ".tbss") == 0
5618 || strncmp (name
, ".tbss.", 6) == 0
5619 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
5620 flags
|= SECTION_TLS
| SECTION_BSS
;
5622 /* These three sections have special ELF types. They are neither
5623 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5624 want to print a section type (@progbits or @nobits). If someone
5625 is silly enough to emit code or TLS variables to one of these
5626 sections, then don't handle them specially. */
5627 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
5628 && (strcmp (name
, ".init_array") == 0
5629 || strcmp (name
, ".fini_array") == 0
5630 || strcmp (name
, ".preinit_array") == 0))
5631 flags
|= SECTION_NOTYPE
;
5636 /* Return true if the target supports some form of global BSS,
5637 either through bss_noswitch_section, or by selecting a BSS
5638 section in TARGET_ASM_SELECT_SECTION. */
5641 have_global_bss_p (void)
5643 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
5646 /* Output assembly to switch to section NAME with attribute FLAGS.
5647 Four variants for common object file formats. */
5650 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
5651 unsigned int flags ATTRIBUTE_UNUSED
,
5652 tree decl ATTRIBUTE_UNUSED
)
5654 /* Some object formats don't support named sections at all. The
5655 front-end should already have flagged this as an error. */
5660 default_elf_asm_named_section (const char *name
, unsigned int flags
,
5661 tree decl ATTRIBUTE_UNUSED
)
5663 char flagchars
[10], *f
= flagchars
;
5665 /* If we have already declared this section, we can use an
5666 abbreviated form to switch back to it -- unless this section is
5667 part of a COMDAT groups, in which case GAS requires the full
5668 declaration every time. */
5669 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5670 && (flags
& SECTION_DECLARED
))
5672 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
5676 if (!(flags
& SECTION_DEBUG
))
5678 if (flags
& SECTION_WRITE
)
5680 if (flags
& SECTION_CODE
)
5682 if (flags
& SECTION_SMALL
)
5684 if (flags
& SECTION_MERGE
)
5686 if (flags
& SECTION_STRINGS
)
5688 if (flags
& SECTION_TLS
)
5690 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5694 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
5696 if (!(flags
& SECTION_NOTYPE
))
5701 if (flags
& SECTION_BSS
)
5707 #ifdef ASM_COMMENT_START
5708 /* On platforms that use "@" as the assembly comment character,
5710 if (strcmp (ASM_COMMENT_START
, "@") == 0)
5713 fprintf (asm_out_file
, format
, type
);
5715 if (flags
& SECTION_ENTSIZE
)
5716 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
5717 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5718 fprintf (asm_out_file
, ",%s,comdat",
5719 lang_hooks
.decls
.comdat_group (decl
));
5722 putc ('\n', asm_out_file
);
5726 default_coff_asm_named_section (const char *name
, unsigned int flags
,
5727 tree decl ATTRIBUTE_UNUSED
)
5729 char flagchars
[8], *f
= flagchars
;
5731 if (flags
& SECTION_WRITE
)
5733 if (flags
& SECTION_CODE
)
5737 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
5741 default_pe_asm_named_section (const char *name
, unsigned int flags
,
5744 default_coff_asm_named_section (name
, flags
, decl
);
5746 if (flags
& SECTION_LINKONCE
)
5748 /* Functions may have been compiled at various levels of
5749 optimization so we can't use `same_size' here.
5750 Instead, have the linker pick one. */
5751 fprintf (asm_out_file
, "\t.linkonce %s\n",
5752 (flags
& SECTION_CODE
? "discard" : "same_size"));
5756 /* The lame default section selector. */
5759 default_select_section (tree decl
, int reloc
,
5760 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
5764 if (decl_readonly_section (decl
, reloc
))
5765 return readonly_data_section
;
5767 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5769 if (! ((flag_pic
&& reloc
)
5770 || !TREE_READONLY (decl
)
5771 || TREE_SIDE_EFFECTS (decl
)
5772 || !TREE_CONSTANT (decl
)))
5773 return readonly_data_section
;
5775 else if (TREE_CODE (decl
) == STRING_CST
)
5776 return readonly_data_section
;
5777 else if (! (flag_pic
&& reloc
))
5778 return readonly_data_section
;
5780 return data_section
;
5783 enum section_category
5784 categorize_decl_for_section (const_tree decl
, int reloc
)
5786 enum section_category ret
;
5788 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5790 else if (TREE_CODE (decl
) == STRING_CST
)
5792 if (flag_mudflap
) /* or !flag_merge_constants */
5793 return SECCAT_RODATA
;
5795 return SECCAT_RODATA_MERGE_STR
;
5797 else if (TREE_CODE (decl
) == VAR_DECL
)
5799 if (bss_initializer_p (decl
))
5801 else if (! TREE_READONLY (decl
)
5802 || TREE_SIDE_EFFECTS (decl
)
5803 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
5805 /* Here the reloc_rw_mask is not testing whether the section should
5806 be read-only or not, but whether the dynamic link will have to
5807 do something. If so, we wish to segregate the data in order to
5808 minimize cache misses inside the dynamic linker. */
5809 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
5810 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
5814 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
5815 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
5816 else if (reloc
|| flag_merge_constants
< 2)
5817 /* C and C++ don't allow different variables to share the same
5818 location. -fmerge-all-constants allows even that (at the
5819 expense of not conforming). */
5820 ret
= SECCAT_RODATA
;
5821 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
5822 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
5824 ret
= SECCAT_RODATA_MERGE_CONST
;
5826 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5828 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
5829 || TREE_SIDE_EFFECTS (decl
)
5830 || ! TREE_CONSTANT (decl
))
5833 ret
= SECCAT_RODATA
;
5836 ret
= SECCAT_RODATA
;
5838 /* There are no read-only thread-local sections. */
5839 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_TLS_MODEL (decl
))
5841 if (DECL_TLS_MODEL (decl
) == TLS_MODEL_EMULATED
)
5843 if (DECL_EMUTLS_VAR_P (decl
))
5845 if (targetm
.emutls
.var_section
)
5846 ret
= SECCAT_EMUTLS_VAR
;
5850 if (targetm
.emutls
.tmpl_prefix
)
5851 ret
= SECCAT_EMUTLS_TMPL
;
5854 /* Note that this would be *just* SECCAT_BSS, except that there's
5855 no concept of a read-only thread-local-data section. */
5856 else if (ret
== SECCAT_BSS
5857 || (flag_zero_initialized_in_bss
5858 && initializer_zerop (DECL_INITIAL (decl
))))
5864 /* If the target uses small data sections, select it. */
5865 else if (targetm
.in_small_data_p (decl
))
5867 if (ret
== SECCAT_BSS
)
5869 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
5870 ret
= SECCAT_SRODATA
;
5879 decl_readonly_section (const_tree decl
, int reloc
)
5881 switch (categorize_decl_for_section (decl
, reloc
))
5884 case SECCAT_RODATA_MERGE_STR
:
5885 case SECCAT_RODATA_MERGE_STR_INIT
:
5886 case SECCAT_RODATA_MERGE_CONST
:
5887 case SECCAT_SRODATA
:
5896 /* Select a section based on the above categorization. */
5899 default_elf_select_section (tree decl
, int reloc
,
5900 unsigned HOST_WIDE_INT align
)
5903 switch (categorize_decl_for_section (decl
, reloc
))
5906 /* We're not supposed to be called on FUNCTION_DECLs. */
5909 return readonly_data_section
;
5910 case SECCAT_RODATA_MERGE_STR
:
5911 return mergeable_string_section (decl
, align
, 0);
5912 case SECCAT_RODATA_MERGE_STR_INIT
:
5913 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
5914 case SECCAT_RODATA_MERGE_CONST
:
5915 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
5916 case SECCAT_SRODATA
:
5920 return data_section
;
5921 case SECCAT_DATA_REL
:
5922 sname
= ".data.rel";
5924 case SECCAT_DATA_REL_LOCAL
:
5925 sname
= ".data.rel.local";
5927 case SECCAT_DATA_REL_RO
:
5928 sname
= ".data.rel.ro";
5930 case SECCAT_DATA_REL_RO_LOCAL
:
5931 sname
= ".data.rel.ro.local";
5950 case SECCAT_EMUTLS_VAR
:
5951 sname
= targetm
.emutls
.var_section
;
5953 case SECCAT_EMUTLS_TMPL
:
5954 sname
= targetm
.emutls
.tmpl_section
;
5962 return get_named_section (decl
, sname
, reloc
);
5965 /* Construct a unique section name based on the decl name and the
5966 categorization performed above. */
5969 default_unique_section (tree decl
, int reloc
)
5971 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5972 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
5973 const char *prefix
, *name
, *linkonce
;
5976 switch (categorize_decl_for_section (decl
, reloc
))
5979 prefix
= one_only
? ".t" : ".text";
5982 case SECCAT_RODATA_MERGE_STR
:
5983 case SECCAT_RODATA_MERGE_STR_INIT
:
5984 case SECCAT_RODATA_MERGE_CONST
:
5985 prefix
= one_only
? ".r" : ".rodata";
5987 case SECCAT_SRODATA
:
5988 prefix
= one_only
? ".s2" : ".sdata2";
5991 prefix
= one_only
? ".d" : ".data";
5993 case SECCAT_DATA_REL
:
5994 prefix
= one_only
? ".d.rel" : ".data.rel";
5996 case SECCAT_DATA_REL_LOCAL
:
5997 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
5999 case SECCAT_DATA_REL_RO
:
6000 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6002 case SECCAT_DATA_REL_RO_LOCAL
:
6003 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6006 prefix
= one_only
? ".s" : ".sdata";
6009 prefix
= one_only
? ".b" : ".bss";
6012 prefix
= one_only
? ".sb" : ".sbss";
6015 prefix
= one_only
? ".td" : ".tdata";
6018 prefix
= one_only
? ".tb" : ".tbss";
6020 case SECCAT_EMUTLS_VAR
:
6021 prefix
= targetm
.emutls
.var_section
;
6023 case SECCAT_EMUTLS_TMPL
:
6024 prefix
= targetm
.emutls
.tmpl_section
;
6030 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6031 name
= targetm
.strip_name_encoding (name
);
6033 /* If we're using one_only, then there needs to be a .gnu.linkonce
6034 prefix to the section name. */
6035 linkonce
= one_only
? ".gnu.linkonce" : "";
6037 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6039 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6042 /* Like compute_reloc_for_constant, except for an RTX. The return value
6043 is a mask for which bit 1 indicates a global relocation, and bit 0
6044 indicates a local relocation. */
6047 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6052 switch (GET_CODE (x
))
6055 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6068 compute_reloc_for_rtx (rtx x
)
6072 switch (GET_CODE (x
))
6078 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6087 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6089 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6091 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6092 return data_section
;
6094 return readonly_data_section
;
6098 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6099 unsigned HOST_WIDE_INT align
)
6101 int reloc
= compute_reloc_for_rtx (x
);
6103 /* ??? Handle small data here somehow. */
6105 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6108 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6110 return get_named_section (NULL
, ".data.rel.ro", 3);
6113 return mergeable_constant_section (mode
, align
, 0);
6116 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6119 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6124 /* Careful not to prod global register variables. */
6127 symbol
= XEXP (rtl
, 0);
6128 if (GET_CODE (symbol
) != SYMBOL_REF
)
6131 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6132 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6133 flags
|= SYMBOL_FLAG_FUNCTION
;
6134 if (targetm
.binds_local_p (decl
))
6135 flags
|= SYMBOL_FLAG_LOCAL
;
6136 if (targetm
.have_tls
&& TREE_CODE (decl
) == VAR_DECL
6137 && DECL_THREAD_LOCAL_P (decl
))
6138 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6139 else if (targetm
.in_small_data_p (decl
))
6140 flags
|= SYMBOL_FLAG_SMALL
;
6141 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6142 being PUBLIC, the thing *must* be defined in this translation unit.
6143 Prevent this buglet from being propagated into rtl code as well. */
6144 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6145 flags
|= SYMBOL_FLAG_EXTERNAL
;
6147 SYMBOL_REF_FLAGS (symbol
) = flags
;
6150 /* By default, we do nothing for encode_section_info, so we need not
6151 do anything but discard the '*' marker. */
6154 default_strip_name_encoding (const char *str
)
6156 return str
+ (*str
== '*');
6159 #ifdef ASM_OUTPUT_DEF
6160 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6161 anchor relative to ".", the current section position. */
6164 default_asm_output_anchor (rtx symbol
)
6168 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6169 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6170 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6174 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6177 default_use_anchors_for_symbol_p (const_rtx symbol
)
6182 /* Don't use anchors for mergeable sections. The linker might move
6183 the objects around. */
6184 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6185 if (sect
->common
.flags
& SECTION_MERGE
)
6188 /* Don't use anchors for small data sections. The small data register
6189 acts as an anchor for such sections. */
6190 if (sect
->common
.flags
& SECTION_SMALL
)
6193 decl
= SYMBOL_REF_DECL (symbol
);
6194 if (decl
&& DECL_P (decl
))
6196 /* Don't use section anchors for decls that might be defined by
6198 if (!targetm
.binds_local_p (decl
))
6201 /* Don't use section anchors for decls that will be placed in a
6202 small data section. */
6203 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6204 one above. The problem is that we only use SECTION_SMALL for
6205 sections that should be marked as small in the section directive. */
6206 if (targetm
.in_small_data_p (decl
))
6212 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6213 wrt cross-module name binding. */
6216 default_binds_local_p (const_tree exp
)
6218 return default_binds_local_p_1 (exp
, flag_shlib
);
6222 default_binds_local_p_1 (const_tree exp
, int shlib
)
6226 /* A non-decl is an entry in the constant pool. */
6229 /* Weakrefs may not bind locally, even though the weakref itself is
6230 always static and therefore local. */
6231 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
)))
6233 /* Static variables are always local. */
6234 else if (! TREE_PUBLIC (exp
))
6236 /* A variable is local if the user has said explicitly that it will
6238 else if (DECL_VISIBILITY_SPECIFIED (exp
)
6239 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6241 /* Variables defined outside this object might not be local. */
6242 else if (DECL_EXTERNAL (exp
))
6244 /* If defined in this object and visibility is not default, must be
6246 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6248 /* Default visibility weak data can be overridden by a strong symbol
6249 in another module and so are not local. */
6250 else if (DECL_WEAK (exp
))
6252 /* If PIC, then assume that any global name can be overridden by
6253 symbols resolved from other modules, unless we are compiling with
6254 -fwhole-program, which assumes that names are local. */
6256 local_p
= flag_whole_program
;
6257 /* Uninitialized COMMON variable may be unified with symbols
6258 resolved from other modules. */
6259 else if (DECL_COMMON (exp
)
6260 && (DECL_INITIAL (exp
) == NULL
6261 || DECL_INITIAL (exp
) == error_mark_node
))
6263 /* Otherwise we're left with initialized (or non-common) global data
6264 which is of necessity defined locally. */
6271 /* Determine whether or not a pointer mode is valid. Assume defaults
6272 of ptr_mode or Pmode - can be overridden. */
6274 default_valid_pointer_mode (enum machine_mode mode
)
6276 return (mode
== ptr_mode
|| mode
== Pmode
);
6279 /* Default function to output code that will globalize a label. A
6280 target must define GLOBAL_ASM_OP or provide its own function to
6281 globalize a label. */
6282 #ifdef GLOBAL_ASM_OP
6284 default_globalize_label (FILE * stream
, const char *name
)
6286 fputs (GLOBAL_ASM_OP
, stream
);
6287 assemble_name (stream
, name
);
6288 putc ('\n', stream
);
6290 #endif /* GLOBAL_ASM_OP */
6292 /* Default function to output code that will globalize a declaration. */
6294 default_globalize_decl_name (FILE * stream
, tree decl
)
6296 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6297 targetm
.asm_out
.globalize_label (stream
, name
);
6300 /* Default function to output a label for unwind information. The
6301 default is to do nothing. A target that needs nonlocal labels for
6302 unwind information must provide its own function to do this. */
6304 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6305 tree decl ATTRIBUTE_UNUSED
,
6306 int for_eh ATTRIBUTE_UNUSED
,
6307 int empty ATTRIBUTE_UNUSED
)
6311 /* Default function to output a label to divide up the exception table.
6312 The default is to do nothing. A target that needs/wants to divide
6313 up the table must provide it's own function to do this. */
6315 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6319 /* This is how to output an internal numbered label where PREFIX is
6320 the class of label and LABELNO is the number within the class. */
6323 default_internal_label (FILE *stream
, const char *prefix
,
6324 unsigned long labelno
)
6326 char *const buf
= alloca (40 + strlen (prefix
));
6327 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6328 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6331 /* This is the default behavior at the beginning of a file. It's
6332 controlled by two other target-hook toggles. */
6334 default_file_start (void)
6336 if (targetm
.file_start_app_off
&& !flag_verbose_asm
)
6337 fputs (ASM_APP_OFF
, asm_out_file
);
6339 if (targetm
.file_start_file_directive
)
6340 output_file_directive (asm_out_file
, main_input_filename
);
6343 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6344 which emits a special section directive used to indicate whether or
6345 not this object file needs an executable stack. This is primarily
6346 a GNU extension to ELF but could be used on other targets. */
6348 int trampolines_created
;
6351 file_end_indicate_exec_stack (void)
6353 unsigned int flags
= SECTION_DEBUG
;
6354 if (trampolines_created
)
6355 flags
|= SECTION_CODE
;
6357 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6360 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6361 a get_unnamed_section callback. */
6364 output_section_asm_op (const void *directive
)
6366 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6369 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6370 the current section is NEW_SECTION. */
6373 switch_to_section (section
*new_section
)
6375 if (in_section
== new_section
)
6378 if (new_section
->common
.flags
& SECTION_FORGET
)
6381 in_section
= new_section
;
6383 switch (SECTION_STYLE (new_section
))
6387 && !crtl
->subsections
.unlikely_text_section_name
6388 && strcmp (new_section
->named
.name
,
6389 UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
6390 crtl
->subsections
.unlikely_text_section_name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
6392 targetm
.asm_out
.named_section (new_section
->named
.name
,
6393 new_section
->named
.common
.flags
,
6394 new_section
->named
.decl
);
6397 case SECTION_UNNAMED
:
6398 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6401 case SECTION_NOSWITCH
:
6406 new_section
->common
.flags
|= SECTION_DECLARED
;
6409 /* If block symbol SYMBOL has not yet been assigned an offset, place
6410 it at the end of its block. */
6413 place_block_symbol (rtx symbol
)
6415 unsigned HOST_WIDE_INT size
, mask
, offset
;
6416 struct constant_descriptor_rtx
*desc
;
6417 unsigned int alignment
;
6418 struct object_block
*block
;
6421 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6422 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6425 /* Work out the symbol's size and alignment. */
6426 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6428 desc
= SYMBOL_REF_CONSTANT (symbol
);
6429 alignment
= desc
->align
;
6430 size
= GET_MODE_SIZE (desc
->mode
);
6432 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6434 decl
= SYMBOL_REF_DECL (symbol
);
6435 alignment
= get_constant_alignment (decl
);
6436 size
= get_constant_size (decl
);
6440 decl
= SYMBOL_REF_DECL (symbol
);
6441 alignment
= DECL_ALIGN (decl
);
6442 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6445 /* Calculate the object's offset from the start of the block. */
6446 block
= SYMBOL_REF_BLOCK (symbol
);
6447 mask
= alignment
/ BITS_PER_UNIT
- 1;
6448 offset
= (block
->size
+ mask
) & ~mask
;
6449 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6451 /* Record the block's new alignment and size. */
6452 block
->alignment
= MAX (block
->alignment
, alignment
);
6453 block
->size
= offset
+ size
;
6455 VEC_safe_push (rtx
, gc
, block
->objects
, symbol
);
6458 /* Return the anchor that should be used to address byte offset OFFSET
6459 from the first object in BLOCK. MODEL is the TLS model used
6463 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
6464 enum tls_model model
)
6467 unsigned int begin
, middle
, end
;
6468 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
6471 /* Work out the anchor's offset. Use an offset of 0 for the first
6472 anchor so that we don't pessimize the case where we take the address
6473 of a variable at the beginning of the block. This is particularly
6474 useful when a block has only one variable assigned to it.
6476 We try to place anchors RANGE bytes apart, so there can then be
6477 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6478 a ptr_mode offset. With some target settings, the lowest such
6479 anchor might be out of range for the lowest ptr_mode offset;
6480 likewise the highest anchor for the highest offset. Use anchors
6481 at the extreme ends of the ptr_mode range in such cases.
6483 All arithmetic uses unsigned integers in order to avoid
6485 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
6486 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
6487 range
= max_offset
- min_offset
+ 1;
6492 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
6495 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
6496 delta
-= delta
% range
;
6499 offset
= (HOST_WIDE_INT
) (-delta
);
6503 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
6504 delta
-= delta
% range
;
6505 if (delta
> bias
- 1)
6507 offset
= (HOST_WIDE_INT
) delta
;
6511 /* Do a binary search to see if there's already an anchor we can use.
6512 Set BEGIN to the new anchor's index if not. */
6514 end
= VEC_length (rtx
, block
->anchors
);
6515 while (begin
!= end
)
6517 middle
= (end
+ begin
) / 2;
6518 anchor
= VEC_index (rtx
, block
->anchors
, middle
);
6519 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
6521 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
6523 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
6525 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
6531 /* Create a new anchor with a unique label. */
6532 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
6533 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
6534 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
6535 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
6537 /* Insert it at index BEGIN. */
6538 VEC_safe_insert (rtx
, gc
, block
->anchors
, begin
, anchor
);
6542 /* Output the objects in BLOCK. */
6545 output_object_block (struct object_block
*block
)
6547 struct constant_descriptor_rtx
*desc
;
6549 HOST_WIDE_INT offset
;
6553 if (block
->objects
== NULL
)
6556 /* Switch to the section and make sure that the first byte is
6557 suitably aligned. */
6558 switch_to_section (block
->sect
);
6559 assemble_align (block
->alignment
);
6561 /* Define the values of all anchors relative to the current section
6563 for (i
= 0; VEC_iterate (rtx
, block
->anchors
, i
, symbol
); i
++)
6564 targetm
.asm_out
.output_anchor (symbol
);
6566 /* Output the objects themselves. */
6568 for (i
= 0; VEC_iterate (rtx
, block
->objects
, i
, symbol
); i
++)
6570 /* Move to the object's offset, padding with zeros if necessary. */
6571 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
6572 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
6573 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6575 desc
= SYMBOL_REF_CONSTANT (symbol
);
6576 output_constant_pool_1 (desc
, 1);
6577 offset
+= GET_MODE_SIZE (desc
->mode
);
6579 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6581 decl
= SYMBOL_REF_DECL (symbol
);
6582 assemble_constant_contents (decl
, XSTR (symbol
, 0),
6583 get_constant_alignment (decl
));
6584 offset
+= get_constant_size (decl
);
6588 decl
= SYMBOL_REF_DECL (symbol
);
6589 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
6590 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6595 /* A htab_traverse callback used to call output_object_block for
6596 each member of object_block_htab. */
6599 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
6601 output_object_block ((struct object_block
*) (*slot
));
6605 /* Output the definitions of all object_blocks. */
6608 output_object_blocks (void)
6610 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
6613 /* This function provides a possible implementation of the
6614 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6615 by -frecord-gcc-switches it creates a new mergeable, string section in the
6616 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6617 contains the switches in ASCII format.
6619 FIXME: This code does not correctly handle double quote characters
6620 that appear inside strings, (it strips them rather than preserving them).
6621 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6622 characters - instead it treats them as sub-string separators. Since
6623 we want to emit NUL strings terminators into the object file we have to use
6627 elf_record_gcc_switches (print_switch_type type
, const char * name
)
6629 static char buffer
[1024];
6631 /* This variable is used as part of a simplistic heuristic to detect
6632 command line switches which take an argument:
6634 "If a command line option does not start with a dash then
6635 it is an argument for the previous command line option."
6637 This fails in the case of the command line option which is the name
6638 of the file to compile, but otherwise it is pretty reasonable. */
6639 static bool previous_name_held_back
= FALSE
;
6643 case SWITCH_TYPE_PASSED
:
6646 if (previous_name_held_back
)
6648 unsigned int len
= strlen (buffer
);
6650 snprintf (buffer
+ len
, sizeof buffer
- len
, " %s", name
);
6651 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6652 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6653 previous_name_held_back
= FALSE
;
6657 strncpy (buffer
, name
, sizeof buffer
);
6658 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6659 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6664 if (previous_name_held_back
)
6666 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6667 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6670 strncpy (buffer
, name
, sizeof buffer
);
6671 previous_name_held_back
= TRUE
;
6675 case SWITCH_TYPE_DESCRIPTIVE
:
6678 /* Distinguish between invocations where name is NULL. */
6679 static bool started
= false;
6683 if (previous_name_held_back
)
6685 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6686 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6693 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
6697 | (SECTION_ENTSIZE
& 1),
6699 switch_to_section (sec
);
6708 /* The return value is currently ignored by the caller, but must be 0.
6709 For -fverbose-asm the return value would be the number of characters
6710 emitted into the assembler file. */
6714 /* Emit text to declare externally defined symbols. It is needed to
6715 properly support non-default visibility. */
6717 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
6719 const char *name ATTRIBUTE_UNUSED
)
6721 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6722 set in order to avoid putting out names that are never really
6724 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
6725 && targetm
.binds_local_p (decl
))
6726 maybe_assemble_visibility (decl
);
6729 #include "gt-varasm.h"