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 "tree-mudflap.h"
53 #include "cfglayout.h"
54 #include "basic-block.h"
55 #include "tree-iterator.h"
57 #ifdef XCOFF_DEBUGGING_INFO
58 #include "xcoffout.h" /* Needed for external data
59 declarations for e.g. AIX 4.x. */
62 /* The (assembler) name of the first globally-visible object output. */
63 extern GTY(()) const char *first_global_object_name
;
64 extern GTY(()) const char *weak_global_object_name
;
66 const char *first_global_object_name
;
67 const char *weak_global_object_name
;
70 struct constant_descriptor_rtx
;
71 struct rtx_constant_pool
;
73 #define n_deferred_constants (crtl->varasm.deferred_constants)
75 /* Number for making the label on the next
76 constant that is stored in memory. */
78 static GTY(()) int const_labelno
;
80 /* Carry information from ASM_DECLARE_OBJECT_NAME
81 to ASM_FINISH_DECLARE_OBJECT. */
83 int size_directive_output
;
85 /* The last decl for which assemble_variable was called,
86 if it did ASM_DECLARE_OBJECT_NAME.
87 If the last call to assemble_variable didn't do that,
90 tree last_assemble_variable_decl
;
92 /* The following global variable indicates if the first basic block
93 in a function belongs to the cold partition or not. */
95 bool first_function_block_is_cold
;
97 /* We give all constants their own alias set. Perhaps redundant with
98 MEM_READONLY_P, but pre-dates it. */
100 static alias_set_type const_alias_set
;
102 static const char *strip_reg_name (const char *);
103 static int contains_pointers_p (tree
);
104 #ifdef ASM_OUTPUT_EXTERNAL
105 static bool incorporeal_function_p (tree
);
107 static void decode_addr_const (tree
, struct addr_const
*);
108 static hashval_t
const_desc_hash (const void *);
109 static int const_desc_eq (const void *, const void *);
110 static hashval_t
const_hash_1 (const tree
);
111 static int compare_constant (const tree
, const tree
);
112 static tree
copy_constant (tree
);
113 static void output_constant_def_contents (rtx
);
114 static void output_addressed_constants (tree
);
115 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
116 static unsigned min_align (unsigned, unsigned);
117 static void output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int);
118 static void globalize_decl (tree
);
119 #ifdef BSS_SECTION_ASM_OP
120 #ifdef ASM_OUTPUT_BSS
121 static void asm_output_bss (FILE *, tree
, const char *,
122 unsigned HOST_WIDE_INT
, unsigned HOST_WIDE_INT
);
124 #ifdef ASM_OUTPUT_ALIGNED_BSS
125 static void asm_output_aligned_bss (FILE *, tree
, const char *,
126 unsigned HOST_WIDE_INT
, int)
129 #endif /* BSS_SECTION_ASM_OP */
130 static void mark_weak (tree
);
131 static void output_constant_pool (const char *, tree
);
133 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
134 section
*text_section
;
135 section
*data_section
;
136 section
*readonly_data_section
;
137 section
*sdata_section
;
138 section
*ctors_section
;
139 section
*dtors_section
;
140 section
*bss_section
;
141 section
*sbss_section
;
143 /* Various forms of common section. All are guaranteed to be nonnull. */
144 section
*tls_comm_section
;
145 section
*comm_section
;
146 section
*lcomm_section
;
148 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
150 section
*bss_noswitch_section
;
152 /* The section that holds the main exception table, when known. The section
153 is set either by the target's init_sections hook or by the first call to
154 switch_to_exception_section. */
155 section
*exception_section
;
157 /* The section that holds the DWARF2 frame unwind information, when known.
158 The section is set either by the target's init_sections hook or by the
159 first call to switch_to_eh_frame_section. */
160 section
*eh_frame_section
;
162 /* asm_out_file's current section. This is NULL if no section has yet
163 been selected or if we lose track of what the current section is. */
166 /* True if code for the current function is currently being directed
167 at the cold section. */
168 bool in_cold_section_p
;
170 /* A linked list of all the unnamed sections. */
171 static GTY(()) section
*unnamed_sections
;
173 /* Return a nonzero value if DECL has a section attribute. */
174 #ifndef IN_NAMED_SECTION
175 #define IN_NAMED_SECTION(DECL) \
176 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
177 && DECL_SECTION_NAME (DECL) != NULL_TREE)
180 /* Hash table of named sections. */
181 static GTY((param_is (section
))) htab_t section_htab
;
183 /* A table of object_blocks, indexed by section. */
184 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
186 /* The next number to use for internal anchor labels. */
187 static GTY(()) int anchor_labelno
;
189 /* A pool of constants that can be shared between functions. */
190 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
194 static GTY ((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
196 static GTY (()) tree emutls_object_type
;
198 #ifndef NO_DOT_IN_LABEL
199 # define EMUTLS_VAR_PREFIX "__emutls_v."
200 # define EMUTLS_TMPL_PREFIX "__emutls_t."
201 #elif !defined NO_DOLLAR_IN_LABEL
202 # define EMUTLS_VAR_PREFIX "__emutls_v$"
203 # define EMUTLS_TMPL_PREFIX "__emutls_t$"
205 # define EMUTLS_VAR_PREFIX "__emutls_v_"
206 # define EMUTLS_TMPL_PREFIX "__emutls_t_"
209 /* Create an identifier for the struct __emutls_object, given an identifier
210 of the DECL_ASSEMBLY_NAME of the original object. */
213 get_emutls_object_name (tree name
)
215 char *toname
= alloca (strlen (IDENTIFIER_POINTER (name
))
216 + sizeof (EMUTLS_VAR_PREFIX
));
217 strcpy (toname
, EMUTLS_VAR_PREFIX
);
218 strcpy (toname
+ sizeof (EMUTLS_VAR_PREFIX
) - 1, IDENTIFIER_POINTER (name
));
220 return get_identifier (toname
);
223 /* Create the structure for struct __emutls_object. This should match the
224 structure at the top of emutls.c, modulo the union there. */
227 get_emutls_object_type (void)
229 tree type
, type_name
, field
, next_field
, word_type_node
;
231 type
= emutls_object_type
;
235 emutls_object_type
= type
= lang_hooks
.types
.make_type (RECORD_TYPE
);
236 type_name
= get_identifier ("__emutls_object");
237 type_name
= build_decl (TYPE_DECL
, type_name
, type
);
238 TYPE_NAME (type
) = type_name
;
240 field
= build_decl (FIELD_DECL
, get_identifier ("__templ"), ptr_type_node
);
241 DECL_CONTEXT (field
) = type
;
244 field
= build_decl (FIELD_DECL
, get_identifier ("__offset"), ptr_type_node
);
245 DECL_CONTEXT (field
) = type
;
246 TREE_CHAIN (field
) = next_field
;
249 word_type_node
= lang_hooks
.types
.type_for_mode (word_mode
, 1);
250 field
= build_decl (FIELD_DECL
, get_identifier ("__align"), word_type_node
);
251 DECL_CONTEXT (field
) = type
;
252 TREE_CHAIN (field
) = next_field
;
255 field
= build_decl (FIELD_DECL
, get_identifier ("__size"), word_type_node
);
256 DECL_CONTEXT (field
) = type
;
257 TREE_CHAIN (field
) = next_field
;
259 TYPE_FIELDS (type
) = field
;
265 /* Create a read-only variable like DECL, with the same DECL_INITIAL.
266 This will be used for initializing the emulated tls data area. */
269 get_emutls_init_templ_addr (tree decl
)
274 if (!DECL_INITIAL (decl
))
275 return null_pointer_node
;
277 name
= DECL_ASSEMBLER_NAME (decl
);
278 toname
= alloca (strlen (IDENTIFIER_POINTER (name
))
279 + sizeof (EMUTLS_TMPL_PREFIX
));
280 strcpy (toname
, EMUTLS_TMPL_PREFIX
);
281 strcpy (toname
+ sizeof (EMUTLS_TMPL_PREFIX
) - 1, IDENTIFIER_POINTER (name
));
282 name
= get_identifier (toname
);
284 to
= build_decl (VAR_DECL
, name
, TREE_TYPE (decl
));
285 SET_DECL_ASSEMBLER_NAME (to
, DECL_NAME (to
));
287 DECL_ARTIFICIAL (to
) = 1;
288 TREE_USED (to
) = TREE_USED (decl
);
289 TREE_READONLY (to
) = 1;
290 DECL_IGNORED_P (to
) = 1;
291 DECL_CONTEXT (to
) = DECL_CONTEXT (decl
);
292 DECL_WEAK (to
) = DECL_WEAK (decl
);
293 if (DECL_ONE_ONLY (decl
))
295 make_decl_one_only (to
);
296 TREE_STATIC (to
) = TREE_STATIC (decl
);
297 TREE_PUBLIC (to
) = TREE_PUBLIC (decl
);
298 DECL_VISIBILITY (to
) = DECL_VISIBILITY (decl
);
301 TREE_STATIC (to
) = 1;
303 DECL_INITIAL (to
) = DECL_INITIAL (decl
);
304 DECL_INITIAL (decl
) = NULL
;
306 varpool_finalize_decl (to
);
307 return build_fold_addr_expr (to
);
310 /* When emulating tls, we use a control structure for use by the runtime.
311 Create and return this structure. */
314 emutls_decl (tree decl
)
317 struct tree_map
*h
, in
;
320 if (targetm
.have_tls
|| decl
== NULL
|| decl
== error_mark_node
321 || TREE_CODE (decl
) != VAR_DECL
|| ! DECL_THREAD_LOCAL_P (decl
))
324 /* Look up the object in the hash; return the control structure if
325 it has already been created. */
327 emutls_htab
= htab_create_ggc (512, tree_map_hash
, tree_map_eq
, 0);
329 name
= DECL_ASSEMBLER_NAME (decl
);
331 /* Note that we use the hash of the decl's name, rather than a hash
332 of the decl's pointer. In emutls_finish we iterate through the
333 hash table, and we want this traversal to be predictable. */
334 in
.hash
= htab_hash_string (IDENTIFIER_POINTER (name
));
336 loc
= htab_find_slot_with_hash (emutls_htab
, &in
, in
.hash
, INSERT
);
342 to
= build_decl (VAR_DECL
, get_emutls_object_name (name
),
343 get_emutls_object_type ());
345 h
= ggc_alloc (sizeof (struct tree_map
));
349 *(struct tree_map
**) loc
= h
;
351 DECL_ARTIFICIAL (to
) = 1;
352 DECL_IGNORED_P (to
) = 1;
353 TREE_READONLY (to
) = 0;
355 SET_DECL_ASSEMBLER_NAME (to
, DECL_NAME (to
));
356 if (DECL_ONE_ONLY (decl
))
357 make_decl_one_only (to
);
358 DECL_CONTEXT (to
) = DECL_CONTEXT (decl
);
361 /* Note that these fields may need to be updated from time to time from
362 the original decl. Consider:
363 extern __thread int i;
364 int foo() { return i; }
366 in which I goes from external to locally defined and initialized. */
368 TREE_STATIC (to
) = TREE_STATIC (decl
);
369 TREE_USED (to
) = TREE_USED (decl
);
370 TREE_PUBLIC (to
) = TREE_PUBLIC (decl
);
371 DECL_EXTERNAL (to
) = DECL_EXTERNAL (decl
);
372 DECL_COMMON (to
) = DECL_COMMON (decl
);
373 DECL_WEAK (to
) = DECL_WEAK (decl
);
374 DECL_VISIBILITY (to
) = DECL_VISIBILITY (decl
);
380 emutls_common_1 (void **loc
, void *xstmts
)
382 struct tree_map
*h
= *(struct tree_map
**) loc
;
383 tree args
, x
, *pstmts
= (tree
*) xstmts
;
386 if (! DECL_COMMON (h
->base
.from
)
387 || (DECL_INITIAL (h
->base
.from
)
388 && DECL_INITIAL (h
->base
.from
) != error_mark_node
))
391 word_type_node
= lang_hooks
.types
.type_for_mode (word_mode
, 1);
393 /* The idea was to call get_emutls_init_templ_addr here, but if we
394 do this and there is an initializer, -fanchor_section loses,
395 because it would be too late to ensure the template is
397 x
= null_pointer_node
;
398 args
= tree_cons (NULL
, x
, NULL
);
399 x
= build_int_cst (word_type_node
, DECL_ALIGN_UNIT (h
->base
.from
));
400 args
= tree_cons (NULL
, x
, args
);
401 x
= fold_convert (word_type_node
, DECL_SIZE_UNIT (h
->base
.from
));
402 args
= tree_cons (NULL
, x
, args
);
403 x
= build_fold_addr_expr (h
->to
);
404 args
= tree_cons (NULL
, x
, args
);
406 x
= built_in_decls
[BUILT_IN_EMUTLS_REGISTER_COMMON
];
407 x
= build_function_call_expr (x
, args
);
409 append_to_statement_list (x
, pstmts
);
416 tree body
= NULL_TREE
;
418 if (emutls_htab
== NULL
)
421 htab_traverse_noresize (emutls_htab
, emutls_common_1
, &body
);
422 if (body
== NULL_TREE
)
425 cgraph_build_static_cdtor ('I', body
, DEFAULT_INIT_PRIORITY
);
428 /* Helper routines for maintaining section_htab. */
431 section_entry_eq (const void *p1
, const void *p2
)
433 const section
*old
= p1
;
434 const char *new = p2
;
436 return strcmp (old
->named
.name
, new) == 0;
440 section_entry_hash (const void *p
)
442 const section
*old
= p
;
443 return htab_hash_string (old
->named
.name
);
446 /* Return a hash value for section SECT. */
449 hash_section (section
*sect
)
451 if (sect
->common
.flags
& SECTION_NAMED
)
452 return htab_hash_string (sect
->named
.name
);
453 return sect
->common
.flags
;
456 /* Helper routines for maintaining object_block_htab. */
459 object_block_entry_eq (const void *p1
, const void *p2
)
461 const struct object_block
*old
= p1
;
462 const section
*new = p2
;
464 return old
->sect
== new;
468 object_block_entry_hash (const void *p
)
470 const struct object_block
*old
= p
;
471 return hash_section (old
->sect
);
474 /* Return a new unnamed section with the given fields. */
477 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
482 sect
= ggc_alloc (sizeof (struct unnamed_section
));
483 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
484 sect
->unnamed
.callback
= callback
;
485 sect
->unnamed
.data
= data
;
486 sect
->unnamed
.next
= unnamed_sections
;
488 unnamed_sections
= sect
;
492 /* Return a SECTION_NOSWITCH section with the given fields. */
495 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
499 sect
= ggc_alloc (sizeof (struct unnamed_section
));
500 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
501 sect
->noswitch
.callback
= callback
;
506 /* Return the named section structure associated with NAME. Create
507 a new section with the given fields if no such structure exists. */
510 get_section (const char *name
, unsigned int flags
, tree decl
)
512 section
*sect
, **slot
;
515 htab_find_slot_with_hash (section_htab
, name
,
516 htab_hash_string (name
), INSERT
);
517 flags
|= SECTION_NAMED
;
520 sect
= ggc_alloc (sizeof (struct named_section
));
521 sect
->named
.common
.flags
= flags
;
522 sect
->named
.name
= ggc_strdup (name
);
523 sect
->named
.decl
= decl
;
529 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
530 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
532 /* Sanity check user variables for flag changes. */
534 decl
= sect
->named
.decl
;
536 error ("%+D causes a section type conflict", decl
);
542 /* Return true if the current compilation mode benefits from having
543 objects grouped into blocks. */
546 use_object_blocks_p (void)
548 return flag_section_anchors
;
551 /* Return the object_block structure for section SECT. Create a new
552 structure if we haven't created one already. Return null if SECT
555 static struct object_block
*
556 get_block_for_section (section
*sect
)
558 struct object_block
*block
;
564 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
565 hash_section (sect
), INSERT
);
566 block
= (struct object_block
*) *slot
;
569 block
= (struct object_block
*)
570 ggc_alloc_cleared (sizeof (struct object_block
));
577 /* Create a symbol with label LABEL and place it at byte offset
578 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
579 is not yet known. LABEL must be a garbage-collected string. */
582 create_block_symbol (const char *label
, struct object_block
*block
,
583 HOST_WIDE_INT offset
)
588 /* Create the extended SYMBOL_REF. */
589 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
590 symbol
= ggc_alloc_zone (size
, &rtl_zone
);
592 /* Initialize the normal SYMBOL_REF fields. */
593 memset (symbol
, 0, size
);
594 PUT_CODE (symbol
, SYMBOL_REF
);
595 PUT_MODE (symbol
, Pmode
);
596 XSTR (symbol
, 0) = label
;
597 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
599 /* Initialize the block_symbol stuff. */
600 SYMBOL_REF_BLOCK (symbol
) = block
;
601 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
607 initialize_cold_section_name (void)
609 const char *stripped_name
;
613 gcc_assert (cfun
&& current_function_decl
);
614 if (crtl
->subsections
.unlikely_text_section_name
)
617 dsn
= DECL_SECTION_NAME (current_function_decl
);
618 if (flag_function_sections
&& dsn
)
620 name
= alloca (TREE_STRING_LENGTH (dsn
) + 1);
621 memcpy (name
, TREE_STRING_POINTER (dsn
), TREE_STRING_LENGTH (dsn
) + 1);
623 stripped_name
= targetm
.strip_name_encoding (name
);
625 buffer
= ACONCAT ((stripped_name
, "_unlikely", NULL
));
626 crtl
->subsections
.unlikely_text_section_name
= ggc_strdup (buffer
);
629 crtl
->subsections
.unlikely_text_section_name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
632 /* Tell assembler to switch to unlikely-to-be-executed text section. */
635 unlikely_text_section (void)
639 if (!crtl
->subsections
.unlikely_text_section_name
)
640 initialize_cold_section_name ();
642 return get_named_section (NULL
, crtl
->subsections
.unlikely_text_section_name
, 0);
645 return get_named_section (NULL
, UNLIKELY_EXECUTED_TEXT_SECTION_NAME
, 0);
648 /* When called within a function context, return true if the function
649 has been assigned a cold text section and if SECT is that section.
650 When called outside a function context, return true if SECT is the
651 default cold section. */
654 unlikely_text_section_p (section
*sect
)
659 name
= crtl
->subsections
.unlikely_text_section_name
;
661 name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
665 && SECTION_STYLE (sect
) == SECTION_NAMED
666 && strcmp (name
, sect
->named
.name
) == 0);
669 /* Return a section with a particular name and with whatever SECTION_*
670 flags section_type_flags deems appropriate. The name of the section
671 is taken from NAME if nonnull, otherwise it is taken from DECL's
672 DECL_SECTION_NAME. DECL is the decl associated with the section
673 (see the section comment for details) and RELOC is as for
674 section_type_flags. */
677 get_named_section (tree decl
, const char *name
, int reloc
)
681 gcc_assert (!decl
|| DECL_P (decl
));
683 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
685 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
687 return get_section (name
, flags
, decl
);
690 /* If required, set DECL_SECTION_NAME to a unique name. */
693 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
694 int flag_function_or_data_sections
)
696 if (DECL_SECTION_NAME (decl
) == NULL_TREE
697 && targetm
.have_named_sections
698 && (flag_function_or_data_sections
699 || DECL_ONE_ONLY (decl
)))
700 targetm
.asm_out
.unique_section (decl
, reloc
);
703 #ifdef BSS_SECTION_ASM_OP
705 #ifdef ASM_OUTPUT_BSS
707 /* Utility function for ASM_OUTPUT_BSS for targets to use if
708 they don't support alignments in .bss.
709 ??? It is believed that this function will work in most cases so such
710 support is localized here. */
713 asm_output_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
715 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
716 unsigned HOST_WIDE_INT rounded
)
718 gcc_assert (strcmp (XSTR (XEXP (DECL_RTL (decl
), 0), 0), name
) == 0);
719 targetm
.asm_out
.globalize_decl_name (file
, decl
);
720 switch_to_section (bss_section
);
721 #ifdef ASM_DECLARE_OBJECT_NAME
722 last_assemble_variable_decl
= decl
;
723 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
725 /* Standard thing is just output label for the object. */
726 ASM_OUTPUT_LABEL (file
, name
);
727 #endif /* ASM_DECLARE_OBJECT_NAME */
728 ASM_OUTPUT_SKIP (file
, rounded
? rounded
: 1);
733 #ifdef ASM_OUTPUT_ALIGNED_BSS
735 /* Utility function for targets to use in implementing
736 ASM_OUTPUT_ALIGNED_BSS.
737 ??? It is believed that this function will work in most cases so such
738 support is localized here. */
741 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
742 const char *name
, unsigned HOST_WIDE_INT size
,
745 switch_to_section (bss_section
);
746 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
747 #ifdef ASM_DECLARE_OBJECT_NAME
748 last_assemble_variable_decl
= decl
;
749 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
751 /* Standard thing is just output label for the object. */
752 ASM_OUTPUT_LABEL (file
, name
);
753 #endif /* ASM_DECLARE_OBJECT_NAME */
754 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
759 #endif /* BSS_SECTION_ASM_OP */
761 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
762 /* Return the hot section for function DECL. Return text_section for
766 hot_function_section (tree decl
)
768 if (decl
!= NULL_TREE
769 && DECL_SECTION_NAME (decl
) != NULL_TREE
770 && targetm
.have_named_sections
)
771 return get_named_section (decl
, NULL
, 0);
777 /* Return the section for function DECL.
779 If DECL is NULL_TREE, return the text section. We can be passed
780 NULL_TREE under some circumstances by dbxout.c at least. */
783 function_section (tree decl
)
787 if (first_function_block_is_cold
)
790 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
791 if (decl
!= NULL_TREE
792 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
793 return reloc
? unlikely_text_section ()
794 : get_named_section (decl
, NULL
, 0);
796 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
798 return reloc
? unlikely_text_section () : hot_function_section (decl
);
803 current_function_section (void)
805 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
806 if (current_function_decl
!= NULL_TREE
807 && DECL_SECTION_NAME (current_function_decl
) != NULL_TREE
)
808 return in_cold_section_p
? unlikely_text_section ()
809 : get_named_section (current_function_decl
,
812 return targetm
.asm_out
.select_section (current_function_decl
,
814 DECL_ALIGN (current_function_decl
));
816 return (in_cold_section_p
817 ? unlikely_text_section ()
818 : hot_function_section (current_function_decl
));
822 /* Return the read-only data section associated with function DECL. */
825 default_function_rodata_section (tree decl
)
827 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
829 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
831 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
833 size_t len
= strlen (name
) + 3;
834 char* rname
= alloca (len
);
836 strcpy (rname
, ".rodata");
837 strcat (rname
, name
+ 5);
838 return get_section (rname
, SECTION_LINKONCE
, decl
);
840 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
841 else if (DECL_ONE_ONLY (decl
)
842 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
844 size_t len
= strlen (name
) + 1;
845 char *rname
= alloca (len
);
847 memcpy (rname
, name
, len
);
849 return get_section (rname
, SECTION_LINKONCE
, decl
);
851 /* For .text.foo we want to use .rodata.foo. */
852 else if (flag_function_sections
&& flag_data_sections
853 && strncmp (name
, ".text.", 6) == 0)
855 size_t len
= strlen (name
) + 1;
856 char *rname
= alloca (len
+ 2);
858 memcpy (rname
, ".rodata", 7);
859 memcpy (rname
+ 7, name
+ 5, len
- 5);
860 return get_section (rname
, 0, decl
);
864 return readonly_data_section
;
867 /* Return the read-only data section associated with function DECL
868 for targets where that section should be always the single
869 readonly data section. */
872 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
874 return readonly_data_section
;
877 /* Return the section to use for string merging. */
880 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
881 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
882 unsigned int flags ATTRIBUTE_UNUSED
)
886 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
887 && TREE_CODE (decl
) == STRING_CST
888 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
890 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
891 && TREE_STRING_LENGTH (decl
) >= len
)
893 enum machine_mode mode
;
894 unsigned int modesize
;
900 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
901 modesize
= GET_MODE_BITSIZE (mode
);
902 if (modesize
>= 8 && modesize
<= 256
903 && (modesize
& (modesize
- 1)) == 0)
905 if (align
< modesize
)
908 str
= TREE_STRING_POINTER (decl
);
909 unit
= GET_MODE_SIZE (mode
);
911 /* Check for embedded NUL characters. */
912 for (i
= 0; i
< len
; i
+= unit
)
914 for (j
= 0; j
< unit
; j
++)
915 if (str
[i
+ j
] != '\0')
922 sprintf (name
, ".rodata.str%d.%d", modesize
/ 8,
924 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
925 return get_section (name
, flags
, NULL
);
930 return readonly_data_section
;
933 /* Return the section to use for constant merging. */
936 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
937 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
938 unsigned int flags ATTRIBUTE_UNUSED
)
940 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
942 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
948 && (align
& (align
- 1)) == 0)
952 sprintf (name
, ".rodata.cst%d", (int) (align
/ 8));
953 flags
|= (align
/ 8) | SECTION_MERGE
;
954 return get_section (name
, flags
, NULL
);
956 return readonly_data_section
;
959 /* Given NAME, a putative register name, discard any customary prefixes. */
962 strip_reg_name (const char *name
)
964 #ifdef REGISTER_PREFIX
965 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
966 name
+= strlen (REGISTER_PREFIX
);
968 if (name
[0] == '%' || name
[0] == '#')
973 /* The user has asked for a DECL to have a particular name. Set (or
974 change) it in such a way that we don't prefix an underscore to
977 set_user_assembler_name (tree decl
, const char *name
)
979 char *starred
= alloca (strlen (name
) + 2);
981 strcpy (starred
+ 1, name
);
982 change_decl_assembler_name (decl
, get_identifier (starred
));
983 SET_DECL_RTL (decl
, NULL_RTX
);
986 /* Decode an `asm' spec for a declaration as a register name.
987 Return the register number, or -1 if nothing specified,
988 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
989 or -3 if ASMSPEC is `cc' and is not recognized,
990 or -4 if ASMSPEC is `memory' and is not recognized.
991 Accept an exact spelling or a decimal number.
992 Prefixes such as % are optional. */
995 decode_reg_name (const char *asmspec
)
1001 /* Get rid of confusing prefixes. */
1002 asmspec
= strip_reg_name (asmspec
);
1004 /* Allow a decimal number as a "register name". */
1005 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
1006 if (! ISDIGIT (asmspec
[i
]))
1008 if (asmspec
[0] != 0 && i
< 0)
1011 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
1017 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
1019 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
1022 #ifdef ADDITIONAL_REGISTER_NAMES
1024 static const struct { const char *const name
; const int number
; } table
[]
1025 = ADDITIONAL_REGISTER_NAMES
;
1027 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
1028 if (table
[i
].name
[0]
1029 && ! strcmp (asmspec
, table
[i
].name
))
1030 return table
[i
].number
;
1032 #endif /* ADDITIONAL_REGISTER_NAMES */
1034 if (!strcmp (asmspec
, "memory"))
1037 if (!strcmp (asmspec
, "cc"))
1046 /* Return true if DECL's initializer is suitable for a BSS section. */
1049 bss_initializer_p (const_tree decl
)
1051 return (DECL_INITIAL (decl
) == NULL
1052 || DECL_INITIAL (decl
) == error_mark_node
1053 || (flag_zero_initialized_in_bss
1054 /* Leave constant zeroes in .rodata so they
1056 && !TREE_READONLY (decl
)
1057 && initializer_zerop (DECL_INITIAL (decl
))));
1060 /* Compute the alignment of variable specified by DECL.
1061 DONT_OUTPUT_DATA is from assemble_variable. */
1064 align_variable (tree decl
, bool dont_output_data
)
1066 unsigned int align
= DECL_ALIGN (decl
);
1068 /* In the case for initialing an array whose length isn't specified,
1069 where we have not yet been able to do the layout,
1070 figure out the proper alignment now. */
1071 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1072 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1073 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1075 /* Some object file formats have a maximum alignment which they support.
1076 In particular, a.out format supports a maximum alignment of 4. */
1077 if (align
> MAX_OFILE_ALIGNMENT
)
1079 warning (0, "alignment of %q+D is greater than maximum object "
1080 "file alignment. Using %d", decl
,
1081 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1082 align
= MAX_OFILE_ALIGNMENT
;
1085 /* On some machines, it is good to increase alignment sometimes. */
1086 if (! DECL_USER_ALIGN (decl
))
1088 #ifdef DATA_ALIGNMENT
1089 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1090 /* Don't increase alignment too much for TLS variables - TLS space
1092 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1095 #ifdef CONSTANT_ALIGNMENT
1096 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
1098 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1100 /* Don't increase alignment too much for TLS variables - TLS space
1102 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1103 align
= const_align
;
1108 /* Reset the alignment in case we have made it tighter, so we can benefit
1109 from it in get_pointer_alignment. */
1110 DECL_ALIGN (decl
) = align
;
1113 /* Return the section into which the given VAR_DECL or CONST_DECL
1114 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1115 section should be used wherever possible. */
1118 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1122 /* If the decl has been given an explicit section name, then it
1123 isn't common, and shouldn't be handled as such. */
1124 if (DECL_COMMON (decl
) && DECL_SECTION_NAME (decl
) == NULL
)
1126 if (DECL_THREAD_LOCAL_P (decl
))
1127 return tls_comm_section
;
1128 if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1129 return comm_section
;
1132 if (DECL_INITIAL (decl
) == error_mark_node
)
1133 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1134 else if (DECL_INITIAL (decl
))
1135 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1139 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1140 if (IN_NAMED_SECTION (decl
))
1141 return get_named_section (decl
, NULL
, reloc
);
1143 if (!DECL_THREAD_LOCAL_P (decl
)
1144 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1145 && bss_initializer_p (decl
))
1147 if (!TREE_PUBLIC (decl
))
1148 return lcomm_section
;
1149 if (bss_noswitch_section
)
1150 return bss_noswitch_section
;
1153 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1156 /* Return the block into which object_block DECL should be placed. */
1158 static struct object_block
*
1159 get_block_for_decl (tree decl
)
1163 if (TREE_CODE (decl
) == VAR_DECL
)
1165 /* The object must be defined in this translation unit. */
1166 if (DECL_EXTERNAL (decl
))
1169 /* There's no point using object blocks for something that is
1170 isolated by definition. */
1171 if (DECL_ONE_ONLY (decl
))
1175 /* We can only calculate block offsets if the decl has a known
1177 if (DECL_SIZE_UNIT (decl
) == NULL
)
1179 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1182 /* Find out which section should contain DECL. We cannot put it into
1183 an object block if it requires a standalone definition. */
1184 if (TREE_CODE (decl
) == VAR_DECL
)
1185 align_variable (decl
, 0);
1186 sect
= get_variable_section (decl
, true);
1187 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1190 return get_block_for_section (sect
);
1193 /* Make sure block symbol SYMBOL is in block BLOCK. */
1196 change_symbol_block (rtx symbol
, struct object_block
*block
)
1198 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1200 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1201 SYMBOL_REF_BLOCK (symbol
) = block
;
1205 /* Return true if it is possible to put DECL in an object_block. */
1208 use_blocks_for_decl_p (tree decl
)
1210 /* Only data DECLs can be placed into object blocks. */
1211 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1214 /* Detect decls created by dw2_force_const_mem. Such decls are
1215 special because DECL_INITIAL doesn't specify the decl's true value.
1216 dw2_output_indirect_constants will instead call assemble_variable
1217 with dont_output_data set to 1 and then print the contents itself. */
1218 if (DECL_INITIAL (decl
) == decl
)
1221 /* If this decl is an alias, then we don't want to emit a definition. */
1222 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1228 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1229 have static storage duration. In other words, it should not be an
1230 automatic variable, including PARM_DECLs.
1232 There is, however, one exception: this function handles variables
1233 explicitly placed in a particular register by the user.
1235 This is never called for PARM_DECL nodes. */
1238 make_decl_rtl (tree decl
)
1240 const char *name
= 0;
1244 /* Check that we are not being given an automatic variable. */
1245 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1246 && TREE_CODE (decl
) != RESULT_DECL
);
1248 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1249 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1250 || TREE_STATIC (decl
)
1251 || TREE_PUBLIC (decl
)
1252 || DECL_EXTERNAL (decl
)
1253 || DECL_REGISTER (decl
));
1255 /* And that we were not given a type or a label. */
1256 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1257 && TREE_CODE (decl
) != LABEL_DECL
);
1259 /* For a duplicate declaration, we can be called twice on the
1260 same DECL node. Don't discard the RTL already made. */
1261 if (DECL_RTL_SET_P (decl
))
1263 /* If the old RTL had the wrong mode, fix the mode. */
1264 x
= DECL_RTL (decl
);
1265 if (GET_MODE (x
) != DECL_MODE (decl
))
1266 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1268 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1271 /* ??? Another way to do this would be to maintain a hashed
1272 table of such critters. Instead of adding stuff to a DECL
1273 to give certain attributes to it, we could use an external
1274 hash map from DECL to set of attributes. */
1276 /* Let the target reassign the RTL if it wants.
1277 This is necessary, for example, when one machine specific
1278 decl attribute overrides another. */
1279 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1281 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1282 on the new decl information. */
1284 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1285 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1286 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1288 /* Make this function static known to the mudflap runtime. */
1289 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1290 mudflap_enqueue_decl (decl
);
1295 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1297 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1298 && DECL_REGISTER (decl
))
1300 error ("register name not specified for %q+D", decl
);
1302 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1304 const char *asmspec
= name
+1;
1305 reg_number
= decode_reg_name (asmspec
);
1306 /* First detect errors in declaring global registers. */
1307 if (reg_number
== -1)
1308 error ("register name not specified for %q+D", decl
);
1309 else if (reg_number
< 0)
1310 error ("invalid register name for %q+D", decl
);
1311 else if (TYPE_MODE (TREE_TYPE (decl
)) == BLKmode
)
1312 error ("data type of %q+D isn%'t suitable for a register",
1314 else if (! HARD_REGNO_MODE_OK (reg_number
, TYPE_MODE (TREE_TYPE (decl
))))
1315 error ("register specified for %q+D isn%'t suitable for data type",
1317 /* Now handle properly declared static register variables. */
1322 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1324 DECL_INITIAL (decl
) = 0;
1325 error ("global register variable has initial value");
1327 if (TREE_THIS_VOLATILE (decl
))
1328 warning (OPT_Wvolatile_register_var
,
1329 "optimization may eliminate reads and/or "
1330 "writes to register variables");
1332 /* If the user specified one of the eliminables registers here,
1333 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1334 confused with that register and be eliminated. This usage is
1335 somewhat suspect... */
1337 SET_DECL_RTL (decl
, gen_rtx_raw_REG (DECL_MODE (decl
), reg_number
));
1338 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1339 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1341 if (TREE_STATIC (decl
))
1343 /* Make this register global, so not usable for anything
1345 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1346 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1347 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1349 nregs
= hard_regno_nregs
[reg_number
][DECL_MODE (decl
)];
1351 globalize_reg (reg_number
+ --nregs
);
1354 /* As a register variable, it has no section. */
1358 /* Now handle ordinary static variables and functions (in memory).
1359 Also handle vars declared register invalidly. */
1360 else if (name
[0] == '*')
1362 #ifdef REGISTER_PREFIX
1363 if (strlen (REGISTER_PREFIX
) != 0)
1365 reg_number
= decode_reg_name (name
);
1366 if (reg_number
>= 0 || reg_number
== -3)
1367 error ("register name given for non-register variable %q+D", decl
);
1372 /* Specifying a section attribute on a variable forces it into a
1373 non-.bss section, and thus it cannot be common. */
1374 if (TREE_CODE (decl
) == VAR_DECL
1375 && DECL_SECTION_NAME (decl
) != NULL_TREE
1376 && DECL_INITIAL (decl
) == NULL_TREE
1377 && DECL_COMMON (decl
))
1378 DECL_COMMON (decl
) = 0;
1380 /* Variables can't be both common and weak. */
1381 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1382 DECL_COMMON (decl
) = 0;
1384 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1385 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1387 x
= gen_rtx_SYMBOL_REF (Pmode
, name
);
1388 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1389 SET_SYMBOL_REF_DECL (x
, decl
);
1391 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1392 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1393 set_mem_attributes (x
, decl
, 1);
1394 SET_DECL_RTL (decl
, x
);
1396 /* Optionally set flags or add text to the name to record information
1397 such as that it is a function name.
1398 If the name is changed, the macro ASM_OUTPUT_LABELREF
1399 will have to know how to strip this information. */
1400 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1402 /* Make this function static known to the mudflap runtime. */
1403 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1404 mudflap_enqueue_decl (decl
);
1407 /* Output a string of literal assembler code
1408 for an `asm' keyword used between functions. */
1411 assemble_asm (tree string
)
1415 if (TREE_CODE (string
) == ADDR_EXPR
)
1416 string
= TREE_OPERAND (string
, 0);
1418 fprintf (asm_out_file
, "\t%s\n", TREE_STRING_POINTER (string
));
1421 /* Record an element in the table of global destructors. SYMBOL is
1422 a SYMBOL_REF of the function to be called; PRIORITY is a number
1423 between 0 and MAX_INIT_PRIORITY. */
1426 default_stabs_asm_out_destructor (rtx symbol ATTRIBUTE_UNUSED
,
1427 int priority ATTRIBUTE_UNUSED
)
1429 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1430 /* Tell GNU LD that this is part of the static destructor set.
1431 This will work for any system that uses stabs, most usefully
1433 dbxout_begin_simple_stabs ("___DTOR_LIST__", 22 /* N_SETT */);
1434 dbxout_stab_value_label (XSTR (symbol
, 0));
1436 sorry ("global destructors not supported on this target");
1440 /* Write the address of the entity given by SYMBOL to SEC. */
1442 assemble_addr_to_section (rtx symbol
, section
*sec
)
1444 switch_to_section (sec
);
1445 assemble_align (POINTER_SIZE
);
1446 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1449 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1450 not) section for PRIORITY. */
1452 get_cdtor_priority_section (int priority
, bool constructor_p
)
1456 /* ??? This only works reliably with the GNU linker. */
1457 sprintf (buf
, "%s.%.5u",
1458 constructor_p
? ".ctors" : ".dtors",
1459 /* Invert the numbering so the linker puts us in the proper
1460 order; constructors are run from right to left, and the
1461 linker sorts in increasing order. */
1462 MAX_INIT_PRIORITY
- priority
);
1463 return get_section (buf
, SECTION_WRITE
, NULL
);
1467 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1471 if (priority
!= DEFAULT_INIT_PRIORITY
)
1472 sec
= get_cdtor_priority_section (priority
,
1473 /*constructor_p=*/false);
1475 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1477 assemble_addr_to_section (symbol
, sec
);
1480 #ifdef DTORS_SECTION_ASM_OP
1482 default_dtor_section_asm_out_destructor (rtx symbol
,
1483 int priority ATTRIBUTE_UNUSED
)
1485 assemble_addr_to_section (symbol
, dtors_section
);
1489 /* Likewise for global constructors. */
1492 default_stabs_asm_out_constructor (rtx symbol ATTRIBUTE_UNUSED
,
1493 int priority ATTRIBUTE_UNUSED
)
1495 #if defined DBX_DEBUGGING_INFO || defined XCOFF_DEBUGGING_INFO
1496 /* Tell GNU LD that this is part of the static destructor set.
1497 This will work for any system that uses stabs, most usefully
1499 dbxout_begin_simple_stabs ("___CTOR_LIST__", 22 /* N_SETT */);
1500 dbxout_stab_value_label (XSTR (symbol
, 0));
1502 sorry ("global constructors not supported on this target");
1507 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1511 if (priority
!= DEFAULT_INIT_PRIORITY
)
1512 sec
= get_cdtor_priority_section (priority
,
1513 /*constructor_p=*/true);
1515 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1517 assemble_addr_to_section (symbol
, sec
);
1520 #ifdef CTORS_SECTION_ASM_OP
1522 default_ctor_section_asm_out_constructor (rtx symbol
,
1523 int priority ATTRIBUTE_UNUSED
)
1525 assemble_addr_to_section (symbol
, ctors_section
);
1529 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1530 a nonzero value if the constant pool should be output before the
1531 start of the function, or a zero value if the pool should output
1532 after the end of the function. The default is to put it before the
1535 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1536 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1539 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1540 to be output to assembler.
1541 Set first_global_object_name and weak_global_object_name as appropriate. */
1544 notice_global_symbol (tree decl
)
1546 const char **type
= &first_global_object_name
;
1548 if (first_global_object_name
1549 || !TREE_PUBLIC (decl
)
1550 || DECL_EXTERNAL (decl
)
1551 || !DECL_NAME (decl
)
1552 || (TREE_CODE (decl
) != FUNCTION_DECL
1553 && (TREE_CODE (decl
) != VAR_DECL
1554 || (DECL_COMMON (decl
)
1555 && (DECL_INITIAL (decl
) == 0
1556 || DECL_INITIAL (decl
) == error_mark_node
))))
1557 || !MEM_P (DECL_RTL (decl
)))
1560 /* We win when global object is found, but it is useful to know about weak
1561 symbol as well so we can produce nicer unique names. */
1562 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1563 type
= &weak_global_object_name
;
1569 rtx decl_rtl
= DECL_RTL (decl
);
1571 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1572 name
= ggc_strdup (p
);
1578 /* Output assembler code for the constant pool of a function and associated
1579 with defining the name of the function. DECL describes the function.
1580 NAME is the function's name. For the constant pool, we use the current
1581 constant pool data. */
1584 assemble_start_function (tree decl
, const char *fnname
)
1587 char tmp_label
[100];
1588 bool hot_label_written
= false;
1590 crtl
->subsections
.unlikely_text_section_name
= NULL
;
1592 first_function_block_is_cold
= false;
1593 if (flag_reorder_blocks_and_partition
)
1595 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1596 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1597 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1598 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1599 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1600 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1601 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1602 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1607 crtl
->subsections
.hot_section_label
= NULL
;
1608 crtl
->subsections
.cold_section_label
= NULL
;
1609 crtl
->subsections
.hot_section_end_label
= NULL
;
1610 crtl
->subsections
.cold_section_end_label
= NULL
;
1613 /* The following code does not need preprocessing in the assembler. */
1617 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1618 output_constant_pool (fnname
, decl
);
1620 resolve_unique_section (decl
, 0, flag_function_sections
);
1622 /* Make sure the not and cold text (code) sections are properly
1623 aligned. This is necessary here in the case where the function
1624 has both hot and cold sections, because we don't want to re-set
1625 the alignment when the section switch happens mid-function. */
1627 if (flag_reorder_blocks_and_partition
)
1629 switch_to_section (unlikely_text_section ());
1630 assemble_align (DECL_ALIGN (decl
));
1631 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1633 /* When the function starts with a cold section, we need to explicitly
1634 align the hot section and write out the hot section label.
1635 But if the current function is a thunk, we do not have a CFG. */
1636 if (!current_function_is_thunk
1637 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1639 switch_to_section (text_section
);
1640 assemble_align (DECL_ALIGN (decl
));
1641 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1642 hot_label_written
= true;
1643 first_function_block_is_cold
= true;
1646 else if (DECL_SECTION_NAME (decl
))
1648 /* Calls to function_section rely on first_function_block_is_cold
1649 being accurate. The first block may be cold even if we aren't
1650 doing partitioning, if the entire function was decided by
1651 choose_function_section (predict.c) to be cold. */
1653 initialize_cold_section_name ();
1655 if (crtl
->subsections
.unlikely_text_section_name
1656 && strcmp (TREE_STRING_POINTER (DECL_SECTION_NAME (decl
)),
1657 crtl
->subsections
.unlikely_text_section_name
) == 0)
1658 first_function_block_is_cold
= true;
1661 in_cold_section_p
= first_function_block_is_cold
;
1663 /* Switch to the correct text section for the start of the function. */
1665 switch_to_section (function_section (decl
));
1666 if (flag_reorder_blocks_and_partition
1667 && !hot_label_written
)
1668 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1670 /* Tell assembler to move to target machine's alignment for functions. */
1671 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1674 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1677 /* Handle a user-specified function alignment.
1678 Note that we still need to align to DECL_ALIGN, as above,
1679 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1680 if (! DECL_USER_ALIGN (decl
)
1681 && align_functions_log
> align
1682 && cfun
->function_frequency
!= FUNCTION_FREQUENCY_UNLIKELY_EXECUTED
)
1684 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1685 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1686 align_functions_log
, align_functions
- 1);
1688 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1692 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1693 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1696 (*debug_hooks
->begin_function
) (decl
);
1698 /* Make function name accessible from other files, if appropriate. */
1700 if (TREE_PUBLIC (decl
))
1702 notice_global_symbol (decl
);
1704 globalize_decl (decl
);
1706 maybe_assemble_visibility (decl
);
1709 if (DECL_PRESERVE_P (decl
))
1710 targetm
.asm_out
.mark_decl_preserved (fnname
);
1712 /* Do any machine/system dependent processing of the function name. */
1713 #ifdef ASM_DECLARE_FUNCTION_NAME
1714 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1716 /* Standard thing is just output label for the function. */
1717 ASM_OUTPUT_LABEL (asm_out_file
, fnname
);
1718 #endif /* ASM_DECLARE_FUNCTION_NAME */
1721 /* Output assembler code associated with defining the size of the
1722 function. DECL describes the function. NAME is the function's name. */
1725 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1727 #ifdef ASM_DECLARE_FUNCTION_SIZE
1728 /* We could have switched section in the middle of the function. */
1729 if (flag_reorder_blocks_and_partition
)
1730 switch_to_section (function_section (decl
));
1731 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1733 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1735 output_constant_pool (fnname
, decl
);
1736 switch_to_section (function_section (decl
)); /* need to switch back */
1738 /* Output labels for end of hot/cold text sections (to be used by
1740 if (flag_reorder_blocks_and_partition
)
1742 section
*save_text_section
;
1744 save_text_section
= in_section
;
1745 switch_to_section (unlikely_text_section ());
1746 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1747 if (first_function_block_is_cold
)
1748 switch_to_section (text_section
);
1750 switch_to_section (function_section (decl
));
1751 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1752 switch_to_section (save_text_section
);
1756 /* Assemble code to leave SIZE bytes of zeros. */
1759 assemble_zeros (unsigned HOST_WIDE_INT size
)
1761 /* Do no output if -fsyntax-only. */
1762 if (flag_syntax_only
)
1765 #ifdef ASM_NO_SKIP_IN_TEXT
1766 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1767 so we must output 0s explicitly in the text section. */
1768 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1770 unsigned HOST_WIDE_INT i
;
1771 for (i
= 0; i
< size
; i
++)
1772 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1777 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1780 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1783 assemble_align (int align
)
1785 if (align
> BITS_PER_UNIT
)
1787 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1791 /* Assemble a string constant with the specified C string as contents. */
1794 assemble_string (const char *p
, int size
)
1799 /* If the string is very long, split it up. */
1803 int thissize
= size
- pos
;
1804 if (thissize
> maximum
)
1807 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1815 /* A noswitch_section_callback for lcomm_section. */
1818 emit_local (tree decl ATTRIBUTE_UNUSED
,
1819 const char *name ATTRIBUTE_UNUSED
,
1820 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1821 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1823 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1824 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1825 size
, DECL_ALIGN (decl
));
1827 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1828 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1831 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1836 /* A noswitch_section_callback for bss_noswitch_section. */
1838 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
1840 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1841 const char *name ATTRIBUTE_UNUSED
,
1842 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1843 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1845 #if defined ASM_OUTPUT_ALIGNED_BSS
1846 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1849 ASM_OUTPUT_BSS (asm_out_file
, decl
, name
, size
, rounded
);
1855 /* A noswitch_section_callback for comm_section. */
1858 emit_common (tree decl ATTRIBUTE_UNUSED
,
1859 const char *name ATTRIBUTE_UNUSED
,
1860 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1861 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1863 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1864 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1865 size
, DECL_ALIGN (decl
));
1867 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1868 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1871 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1876 /* A noswitch_section_callback for tls_comm_section. */
1879 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1880 const char *name ATTRIBUTE_UNUSED
,
1881 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1882 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1884 #ifdef ASM_OUTPUT_TLS_COMMON
1885 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1888 sorry ("thread-local COMMON data not implemented");
1893 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1894 NAME is the name of DECL's SYMBOL_REF. */
1897 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1899 unsigned HOST_WIDE_INT size
, rounded
;
1901 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1904 /* Don't allocate zero bytes of common,
1905 since that means "undefined external" in the linker. */
1909 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1910 so that each uninitialized object starts on such a boundary. */
1911 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1912 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1913 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1915 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1916 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1917 warning (0, "requested alignment for %q+D is greater than "
1918 "implemented alignment of %wu", decl
, rounded
);
1921 /* A subroutine of assemble_variable. Output the label and contents of
1922 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1923 is as for assemble_variable. */
1926 assemble_variable_contents (tree decl
, const char *name
,
1927 bool dont_output_data
)
1929 /* Do any machine/system dependent processing of the object. */
1930 #ifdef ASM_DECLARE_OBJECT_NAME
1931 last_assemble_variable_decl
= decl
;
1932 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1934 /* Standard thing is just output label for the object. */
1935 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1936 #endif /* ASM_DECLARE_OBJECT_NAME */
1938 if (!dont_output_data
)
1940 if (DECL_INITIAL (decl
)
1941 && DECL_INITIAL (decl
) != error_mark_node
1942 && !initializer_zerop (DECL_INITIAL (decl
)))
1943 /* Output the actual data. */
1944 output_constant (DECL_INITIAL (decl
),
1945 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1948 /* Leave space for it. */
1949 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1953 /* Assemble everything that is needed for a variable or function declaration.
1954 Not used for automatic variables, and not used for function definitions.
1955 Should not be called for variables of incomplete structure type.
1957 TOP_LEVEL is nonzero if this variable has file scope.
1958 AT_END is nonzero if this is the special handling, at end of compilation,
1959 to define things that have had only tentative definitions.
1960 DONT_OUTPUT_DATA if nonzero means don't actually output the
1961 initial value (that will be done by the caller). */
1964 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1965 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1968 rtx decl_rtl
, symbol
;
1971 if (! targetm
.have_tls
1972 && TREE_CODE (decl
) == VAR_DECL
1973 && DECL_THREAD_LOCAL_P (decl
))
1975 tree to
= emutls_decl (decl
);
1977 /* If this variable is defined locally, then we need to initialize the
1978 control structure with size and alignment information. We do this
1979 at the last moment because tentative definitions can take a locally
1980 defined but uninitialized variable and initialize it later, which
1981 would result in incorrect contents. */
1982 if (! DECL_EXTERNAL (to
)
1983 && (! DECL_COMMON (to
)
1984 || (DECL_INITIAL (decl
)
1985 && DECL_INITIAL (decl
) != error_mark_node
)))
1987 VEC(constructor_elt
,gc
) *v
= VEC_alloc (constructor_elt
, gc
, 4);
1988 constructor_elt
*elt
;
1989 tree type
= TREE_TYPE (to
);
1990 tree field
= TYPE_FIELDS (type
);
1992 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
1994 elt
->value
= fold_convert (TREE_TYPE (field
), DECL_SIZE_UNIT (decl
));
1996 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
1997 field
= TREE_CHAIN (field
);
1999 elt
->value
= build_int_cst (TREE_TYPE (field
),
2000 DECL_ALIGN_UNIT (decl
));
2002 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2003 field
= TREE_CHAIN (field
);
2005 elt
->value
= null_pointer_node
;
2007 elt
= VEC_quick_push (constructor_elt
, v
, NULL
);
2008 field
= TREE_CHAIN (field
);
2010 elt
->value
= get_emutls_init_templ_addr (decl
);
2012 DECL_INITIAL (to
) = build_constructor (type
, v
);
2014 /* Make sure the template is marked as needed early enough.
2015 Without this, if the variable is placed in a
2016 section-anchored block, the template will only be marked
2017 when it's too late. */
2018 record_references_in_initializer (to
);
2024 last_assemble_variable_decl
= 0;
2026 /* Normally no need to say anything here for external references,
2027 since assemble_external is called by the language-specific code
2028 when a declaration is first seen. */
2030 if (DECL_EXTERNAL (decl
))
2033 /* Output no assembler code for a function declaration.
2034 Only definitions of functions output anything. */
2036 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2039 /* Do nothing for global register variables. */
2040 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2042 TREE_ASM_WRITTEN (decl
) = 1;
2046 /* If type was incomplete when the variable was declared,
2047 see if it is complete now. */
2049 if (DECL_SIZE (decl
) == 0)
2050 layout_decl (decl
, 0);
2052 /* Still incomplete => don't allocate it; treat the tentative defn
2053 (which is what it must have been) as an `extern' reference. */
2055 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2057 error ("storage size of %q+D isn%'t known", decl
);
2058 TREE_ASM_WRITTEN (decl
) = 1;
2062 /* The first declaration of a variable that comes through this function
2063 decides whether it is global (in C, has external linkage)
2064 or local (in C, has internal linkage). So do nothing more
2065 if this function has already run. */
2067 if (TREE_ASM_WRITTEN (decl
))
2070 /* Make sure targetm.encode_section_info is invoked before we set
2072 decl_rtl
= DECL_RTL (decl
);
2074 TREE_ASM_WRITTEN (decl
) = 1;
2076 /* Do no output if -fsyntax-only. */
2077 if (flag_syntax_only
)
2082 if (! dont_output_data
2083 && ! host_integerp (DECL_SIZE_UNIT (decl
), 1))
2085 error ("size of variable %q+D is too large", decl
);
2089 gcc_assert (MEM_P (decl_rtl
));
2090 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2091 symbol
= XEXP (decl_rtl
, 0);
2092 name
= XSTR (symbol
, 0);
2093 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2094 notice_global_symbol (decl
);
2096 /* Compute the alignment of this data. */
2098 align_variable (decl
, dont_output_data
);
2099 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2101 if (TREE_PUBLIC (decl
))
2102 maybe_assemble_visibility (decl
);
2104 if (DECL_PRESERVE_P (decl
))
2105 targetm
.asm_out
.mark_decl_preserved (name
);
2107 /* First make the assembler name(s) global if appropriate. */
2108 sect
= get_variable_section (decl
, false);
2109 if (TREE_PUBLIC (decl
)
2111 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2112 globalize_decl (decl
);
2114 /* Output any data that we will need to use the address of. */
2115 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2116 output_addressed_constants (DECL_INITIAL (decl
));
2118 /* dbxout.c needs to know this. */
2119 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2120 DECL_IN_TEXT_SECTION (decl
) = 1;
2122 /* If the decl is part of an object_block, make sure that the decl
2123 has been positioned within its block, but do not write out its
2124 definition yet. output_object_blocks will do that later. */
2125 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2127 gcc_assert (!dont_output_data
);
2128 place_block_symbol (symbol
);
2130 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2131 assemble_noswitch_variable (decl
, name
, sect
);
2134 switch_to_section (sect
);
2135 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2136 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2137 assemble_variable_contents (decl
, name
, dont_output_data
);
2141 /* Return 1 if type TYPE contains any pointers. */
2144 contains_pointers_p (tree type
)
2146 switch (TREE_CODE (type
))
2149 case REFERENCE_TYPE
:
2150 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2151 so I'll play safe and return 1. */
2157 case QUAL_UNION_TYPE
:
2160 /* For a type that has fields, see if the fields have pointers. */
2161 for (fields
= TYPE_FIELDS (type
); fields
; fields
= TREE_CHAIN (fields
))
2162 if (TREE_CODE (fields
) == FIELD_DECL
2163 && contains_pointers_p (TREE_TYPE (fields
)))
2169 /* An array type contains pointers if its element type does. */
2170 return contains_pointers_p (TREE_TYPE (type
));
2177 /* In unit-at-a-time mode, we delay assemble_external processing until
2178 the compilation unit is finalized. This is the best we can do for
2179 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2180 it all the way to final. See PR 17982 for further discussion. */
2181 static GTY(()) tree pending_assemble_externals
;
2183 #ifdef ASM_OUTPUT_EXTERNAL
2184 /* True if DECL is a function decl for which no out-of-line copy exists.
2185 It is assumed that DECL's assembler name has been set. */
2188 incorporeal_function_p (tree decl
)
2190 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2194 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2195 && DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
)
2198 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2199 if (strncmp (name
, "__builtin_", strlen ("__builtin_")) == 0)
2205 /* Actually do the tests to determine if this is necessary, and invoke
2206 ASM_OUTPUT_EXTERNAL. */
2208 assemble_external_real (tree decl
)
2210 rtx rtl
= DECL_RTL (decl
);
2212 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2213 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2214 && !incorporeal_function_p (decl
))
2216 /* Some systems do require some output. */
2217 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2218 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2224 process_pending_assemble_externals (void)
2226 #ifdef ASM_OUTPUT_EXTERNAL
2228 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2229 assemble_external_real (TREE_VALUE (list
));
2231 pending_assemble_externals
= 0;
2235 /* Output something to declare an external symbol to the assembler.
2236 (Most assemblers don't need this, so we normally output nothing.)
2237 Do nothing if DECL is not external. */
2240 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2242 /* Because most platforms do not define ASM_OUTPUT_EXTERNAL, the
2243 main body of this code is only rarely exercised. To provide some
2244 testing, on all platforms, we make sure that the ASM_OUT_FILE is
2245 open. If it's not, we should not be calling this function. */
2246 gcc_assert (asm_out_file
);
2248 #ifdef ASM_OUTPUT_EXTERNAL
2249 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2252 /* We want to output external symbols at very last to check if they
2253 are references or not. */
2254 pending_assemble_externals
= tree_cons (0, decl
,
2255 pending_assemble_externals
);
2259 /* Similar, for calling a library function FUN. */
2262 assemble_external_libcall (rtx fun
)
2264 /* Declare library function name external when first used, if nec. */
2265 if (! SYMBOL_REF_USED (fun
))
2267 SYMBOL_REF_USED (fun
) = 1;
2268 targetm
.asm_out
.external_libcall (fun
);
2272 /* Assemble a label named NAME. */
2275 assemble_label (const char *name
)
2277 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2280 /* Set the symbol_referenced flag for ID. */
2282 mark_referenced (tree id
)
2284 TREE_SYMBOL_REFERENCED (id
) = 1;
2287 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2289 mark_decl_referenced (tree decl
)
2291 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2293 /* Extern inline functions don't become needed when referenced.
2294 If we know a method will be emitted in other TU and no new
2295 functions can be marked reachable, just use the external
2297 struct cgraph_node
*node
= cgraph_node (decl
);
2298 if (!DECL_EXTERNAL (decl
)
2299 && (!node
->local
.vtable_method
|| !cgraph_global_info_ready
2300 || !node
->local
.finalized
))
2301 cgraph_mark_needed_node (node
);
2303 else if (TREE_CODE (decl
) == VAR_DECL
)
2305 struct varpool_node
*node
= varpool_node (decl
);
2306 varpool_mark_needed_node (node
);
2307 /* C++ frontend use mark_decl_references to force COMDAT variables
2308 to be output that might appear dead otherwise. */
2309 node
->force_output
= true;
2311 /* else do nothing - we can get various sorts of CST nodes here,
2312 which do not need to be marked. */
2316 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2317 until we find an identifier that is not itself a transparent alias.
2318 Modify the alias passed to it by reference (and all aliases on the
2319 way to the ultimate target), such that they do not have to be
2320 followed again, and return the ultimate target of the alias
2324 ultimate_transparent_alias_target (tree
*alias
)
2326 tree target
= *alias
;
2328 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2330 gcc_assert (TREE_CHAIN (target
));
2331 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2332 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2333 && ! TREE_CHAIN (target
));
2340 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2341 starts with a *, the rest of NAME is output verbatim. Otherwise
2342 NAME is transformed in a target-specific way (usually by the
2343 addition of an underscore). */
2346 assemble_name_raw (FILE *file
, const char *name
)
2349 fputs (&name
[1], file
);
2351 ASM_OUTPUT_LABELREF (file
, name
);
2354 /* Like assemble_name_raw, but should be used when NAME might refer to
2355 an entity that is also represented as a tree (like a function or
2356 variable). If NAME does refer to such an entity, that entity will
2357 be marked as referenced. */
2360 assemble_name (FILE *file
, const char *name
)
2362 const char *real_name
;
2365 real_name
= targetm
.strip_name_encoding (name
);
2367 id
= maybe_get_identifier (real_name
);
2372 mark_referenced (id
);
2373 ultimate_transparent_alias_target (&id
);
2375 name
= IDENTIFIER_POINTER (id
);
2376 gcc_assert (! TREE_CHAIN (id
));
2379 assemble_name_raw (file
, name
);
2382 /* Allocate SIZE bytes writable static space with a gensym name
2383 and return an RTX to refer to its address. */
2386 assemble_static_space (unsigned HOST_WIDE_INT size
)
2389 const char *namestring
;
2392 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2394 namestring
= ggc_strdup (name
);
2396 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2397 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2399 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2400 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2403 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2404 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2407 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2408 so that each uninitialized object starts on such a boundary. */
2409 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2410 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2411 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2412 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2413 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2414 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2421 /* Assemble the static constant template for function entry trampolines.
2422 This is done at most once per compilation.
2423 Returns an RTX for the address of the template. */
2425 static GTY(()) rtx initial_trampoline
;
2427 #ifdef TRAMPOLINE_TEMPLATE
2429 assemble_trampoline_template (void)
2436 if (initial_trampoline
)
2437 return initial_trampoline
;
2439 /* By default, put trampoline templates in read-only data section. */
2441 #ifdef TRAMPOLINE_SECTION
2442 switch_to_section (TRAMPOLINE_SECTION
);
2444 switch_to_section (readonly_data_section
);
2447 /* Write the assembler code to define one. */
2448 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2451 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2454 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2455 TRAMPOLINE_TEMPLATE (asm_out_file
);
2457 /* Record the rtl to refer to it. */
2458 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2459 name
= ggc_strdup (label
);
2460 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2461 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2463 initial_trampoline
= gen_rtx_MEM (BLKmode
, symbol
);
2464 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2466 return initial_trampoline
;
2470 /* A and B are either alignments or offsets. Return the minimum alignment
2471 that may be assumed after adding the two together. */
2473 static inline unsigned
2474 min_align (unsigned int a
, unsigned int b
)
2476 return (a
| b
) & -(a
| b
);
2479 /* Return the assembler directive for creating a given kind of integer
2480 object. SIZE is the number of bytes in the object and ALIGNED_P
2481 indicates whether it is known to be aligned. Return NULL if the
2482 assembly dialect has no such directive.
2484 The returned string should be printed at the start of a new line and
2485 be followed immediately by the object's initial value. */
2488 integer_asm_op (int size
, int aligned_p
)
2490 struct asm_int_op
*ops
;
2493 ops
= &targetm
.asm_out
.aligned_op
;
2495 ops
= &targetm
.asm_out
.unaligned_op
;
2500 return targetm
.asm_out
.byte_op
;
2514 /* Use directive OP to assemble an integer object X. Print OP at the
2515 start of the line, followed immediately by the value of X. */
2518 assemble_integer_with_op (const char *op
, rtx x
)
2520 fputs (op
, asm_out_file
);
2521 output_addr_const (asm_out_file
, x
);
2522 fputc ('\n', asm_out_file
);
2525 /* The default implementation of the asm_out.integer target hook. */
2528 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2529 unsigned int size ATTRIBUTE_UNUSED
,
2530 int aligned_p ATTRIBUTE_UNUSED
)
2532 const char *op
= integer_asm_op (size
, aligned_p
);
2533 /* Avoid GAS bugs for large values. Specifically negative values whose
2534 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2535 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2537 return op
&& (assemble_integer_with_op (op
, x
), true);
2540 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2541 the alignment of the integer in bits. Return 1 if we were able to output
2542 the constant, otherwise 0. We must be able to output the constant,
2543 if FORCE is nonzero. */
2546 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2550 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2552 /* See if the target hook can handle this kind of object. */
2553 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2556 /* If the object is a multi-byte one, try splitting it up. Split
2557 it into words it if is multi-word, otherwise split it into bytes. */
2560 enum machine_mode omode
, imode
;
2561 unsigned int subalign
;
2562 unsigned int subsize
, i
;
2563 unsigned char mclass
;
2565 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2566 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2567 if (GET_CODE (x
) == CONST_FIXED
)
2568 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2572 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2573 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2575 for (i
= 0; i
< size
; i
+= subsize
)
2577 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2578 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2584 /* If we've printed some of it, but not all of it, there's no going
2589 gcc_assert (!force
);
2595 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2597 long data
[4] = {0, 0, 0, 0};
2599 int bitsize
, nelts
, nunits
, units_per
;
2601 /* This is hairy. We have a quantity of known size. real_to_target
2602 will put it into an array of *host* longs, 32 bits per element
2603 (even if long is more than 32 bits). We need to determine the
2604 number of array elements that are occupied (nelts) and the number
2605 of *target* min-addressable units that will be occupied in the
2606 object file (nunits). We cannot assume that 32 divides the
2607 mode's bitsize (size * BITS_PER_UNIT) evenly.
2609 size * BITS_PER_UNIT is used here to make sure that padding bits
2610 (which might appear at either end of the value; real_to_target
2611 will include the padding bits in its output array) are included. */
2613 nunits
= GET_MODE_SIZE (mode
);
2614 bitsize
= nunits
* BITS_PER_UNIT
;
2615 nelts
= CEIL (bitsize
, 32);
2616 units_per
= 32 / BITS_PER_UNIT
;
2618 real_to_target (data
, &d
, mode
);
2620 /* Put out the first word with the specified alignment. */
2621 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2622 nunits
-= units_per
;
2624 /* Subsequent words need only 32-bit alignment. */
2625 align
= min_align (align
, 32);
2627 for (i
= 1; i
< nelts
; i
++)
2629 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2630 nunits
-= units_per
;
2634 /* Given an expression EXP with a constant value,
2635 reduce it to the sum of an assembler symbol and an integer.
2636 Store them both in the structure *VALUE.
2637 EXP must be reducible. */
2639 struct addr_const
GTY(())
2642 HOST_WIDE_INT offset
;
2646 decode_addr_const (tree exp
, struct addr_const
*value
)
2648 tree target
= TREE_OPERAND (exp
, 0);
2654 if (TREE_CODE (target
) == COMPONENT_REF
2655 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2658 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2659 target
= TREE_OPERAND (target
, 0);
2661 else if (TREE_CODE (target
) == ARRAY_REF
2662 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2664 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2665 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2666 target
= TREE_OPERAND (target
, 0);
2672 switch (TREE_CODE (target
))
2676 x
= DECL_RTL (target
);
2680 x
= gen_rtx_MEM (FUNCTION_MODE
,
2681 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2690 x
= output_constant_def (target
, 1);
2697 gcc_assert (MEM_P (x
));
2701 value
->offset
= offset
;
2704 /* Uniquize all constants that appear in memory.
2705 Each constant in memory thus far output is recorded
2706 in `const_desc_table'. */
2708 struct constant_descriptor_tree
GTY(())
2710 /* A MEM for the constant. */
2713 /* The value of the constant. */
2716 /* Hash of value. Computing the hash from value each time
2717 hashfn is called can't work properly, as that means recursive
2718 use of the hash table during hash table expansion. */
2722 static GTY((param_is (struct constant_descriptor_tree
)))
2723 htab_t const_desc_htab
;
2725 static struct constant_descriptor_tree
* build_constant_desc (tree
);
2726 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2728 /* Compute a hash code for a constant expression. */
2731 const_desc_hash (const void *ptr
)
2733 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2737 const_hash_1 (const tree exp
)
2742 enum tree_code code
= TREE_CODE (exp
);
2744 /* Either set P and LEN to the address and len of something to hash and
2745 exit the switch or return a value. */
2750 p
= (char *) &TREE_INT_CST (exp
);
2751 len
= sizeof TREE_INT_CST (exp
);
2755 return real_hash (TREE_REAL_CST_PTR (exp
));
2758 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2761 p
= TREE_STRING_POINTER (exp
);
2762 len
= TREE_STRING_LENGTH (exp
);
2766 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2767 + const_hash_1 (TREE_IMAGPART (exp
)));
2771 unsigned HOST_WIDE_INT idx
;
2774 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2776 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2778 hi
= hi
* 603 + const_hash_1 (value
);
2786 struct addr_const value
;
2788 decode_addr_const (exp
, &value
);
2789 switch (GET_CODE (value
.base
))
2792 /* Don't hash the address of the SYMBOL_REF;
2793 only use the offset and the symbol name. */
2795 p
= XSTR (value
.base
, 0);
2796 for (i
= 0; p
[i
] != 0; i
++)
2797 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2801 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2811 case POINTER_PLUS_EXPR
:
2813 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2814 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2818 case NON_LVALUE_EXPR
:
2819 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2822 /* A language specific constant. Just hash the code. */
2826 /* Compute hashing function. */
2828 for (i
= 0; i
< len
; i
++)
2829 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2834 /* Wrapper of compare_constant, for the htab interface. */
2836 const_desc_eq (const void *p1
, const void *p2
)
2838 const struct constant_descriptor_tree
*c1
= p1
;
2839 const struct constant_descriptor_tree
*c2
= p2
;
2840 if (c1
->hash
!= c2
->hash
)
2842 return compare_constant (c1
->value
, c2
->value
);
2845 /* Compare t1 and t2, and return 1 only if they are known to result in
2846 the same bit pattern on output. */
2849 compare_constant (const tree t1
, const tree t2
)
2851 enum tree_code typecode
;
2853 if (t1
== NULL_TREE
)
2854 return t2
== NULL_TREE
;
2855 if (t2
== NULL_TREE
)
2858 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2861 switch (TREE_CODE (t1
))
2864 /* Integer constants are the same only if the same width of type. */
2865 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2867 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2869 return tree_int_cst_equal (t1
, t2
);
2872 /* Real constants are the same only if the same width of type. */
2873 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2876 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2879 /* Fixed constants are the same only if the same width of type. */
2880 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2883 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2886 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2889 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2890 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2891 TREE_STRING_LENGTH (t1
)));
2894 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2895 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2899 VEC(constructor_elt
, gc
) *v1
, *v2
;
2900 unsigned HOST_WIDE_INT idx
;
2902 typecode
= TREE_CODE (TREE_TYPE (t1
));
2903 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2906 if (typecode
== ARRAY_TYPE
)
2908 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2909 /* For arrays, check that the sizes all match. */
2910 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2912 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2917 /* For record and union constructors, require exact type
2919 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2923 v1
= CONSTRUCTOR_ELTS (t1
);
2924 v2
= CONSTRUCTOR_ELTS (t2
);
2925 if (VEC_length (constructor_elt
, v1
)
2926 != VEC_length (constructor_elt
, v2
))
2929 for (idx
= 0; idx
< VEC_length (constructor_elt
, v1
); ++idx
)
2931 constructor_elt
*c1
= VEC_index (constructor_elt
, v1
, idx
);
2932 constructor_elt
*c2
= VEC_index (constructor_elt
, v2
, idx
);
2934 /* Check that each value is the same... */
2935 if (!compare_constant (c1
->value
, c2
->value
))
2937 /* ... and that they apply to the same fields! */
2938 if (typecode
== ARRAY_TYPE
)
2940 if (!compare_constant (c1
->index
, c2
->index
))
2945 if (c1
->index
!= c2
->index
)
2956 struct addr_const value1
, value2
;
2958 decode_addr_const (t1
, &value1
);
2959 decode_addr_const (t2
, &value2
);
2960 return (value1
.offset
== value2
.offset
2961 && strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2965 case POINTER_PLUS_EXPR
:
2968 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2969 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2973 case NON_LVALUE_EXPR
:
2974 case VIEW_CONVERT_EXPR
:
2975 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2984 /* Make a copy of the whole tree structure for a constant. This
2985 handles the same types of nodes that compare_constant handles. */
2988 copy_constant (tree exp
)
2990 switch (TREE_CODE (exp
))
2993 /* For ADDR_EXPR, we do not want to copy the decl whose address
2994 is requested. We do want to copy constants though. */
2995 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2996 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2997 copy_constant (TREE_OPERAND (exp
, 0)));
2999 return copy_node (exp
);
3005 return copy_node (exp
);
3008 return build_complex (TREE_TYPE (exp
),
3009 copy_constant (TREE_REALPART (exp
)),
3010 copy_constant (TREE_IMAGPART (exp
)));
3013 case POINTER_PLUS_EXPR
:
3015 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3016 copy_constant (TREE_OPERAND (exp
, 0)),
3017 copy_constant (TREE_OPERAND (exp
, 1)));
3021 case NON_LVALUE_EXPR
:
3022 case VIEW_CONVERT_EXPR
:
3023 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3024 copy_constant (TREE_OPERAND (exp
, 0)));
3028 tree copy
= copy_node (exp
);
3029 VEC(constructor_elt
, gc
) *v
;
3030 unsigned HOST_WIDE_INT idx
;
3031 tree purpose
, value
;
3033 v
= VEC_alloc(constructor_elt
, gc
, VEC_length(constructor_elt
,
3034 CONSTRUCTOR_ELTS (exp
)));
3035 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3037 constructor_elt
*ce
= VEC_quick_push (constructor_elt
, v
, NULL
);
3038 ce
->index
= purpose
;
3039 ce
->value
= copy_constant (value
);
3041 CONSTRUCTOR_ELTS (copy
) = v
;
3050 /* Return the alignment of constant EXP in bits. */
3053 get_constant_alignment (tree exp
)
3057 align
= TYPE_ALIGN (TREE_TYPE (exp
));
3058 #ifdef CONSTANT_ALIGNMENT
3059 align
= CONSTANT_ALIGNMENT (exp
, align
);
3064 /* Return the section into which constant EXP should be placed. */
3067 get_constant_section (tree exp
)
3069 if (IN_NAMED_SECTION (exp
))
3070 return get_named_section (exp
, NULL
, compute_reloc_for_constant (exp
));
3072 return targetm
.asm_out
.select_section (exp
,
3073 compute_reloc_for_constant (exp
),
3074 get_constant_alignment (exp
));
3077 /* Return the size of constant EXP in bytes. */
3079 static HOST_WIDE_INT
3080 get_constant_size (tree exp
)
3084 size
= int_size_in_bytes (TREE_TYPE (exp
));
3085 if (TREE_CODE (exp
) == STRING_CST
)
3086 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3090 /* Subroutine of output_constant_def:
3091 No constant equal to EXP is known to have been output.
3092 Make a constant descriptor to enter EXP in the hash table.
3093 Assign the label number and construct RTL to refer to the
3094 constant's location in memory.
3095 Caller is responsible for updating the hash table. */
3097 static struct constant_descriptor_tree
*
3098 build_constant_desc (tree exp
)
3104 struct constant_descriptor_tree
*desc
;
3106 desc
= ggc_alloc (sizeof (*desc
));
3107 desc
->value
= copy_constant (exp
);
3109 /* Propagate marked-ness to copied constant. */
3110 if (flag_mudflap
&& mf_marked_p (exp
))
3111 mf_mark (desc
->value
);
3113 /* Create a string containing the label name, in LABEL. */
3114 labelno
= const_labelno
++;
3115 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3117 /* We have a symbol name; construct the SYMBOL_REF and the MEM. */
3118 if (use_object_blocks_p ())
3120 section
*sect
= get_constant_section (exp
);
3121 symbol
= create_block_symbol (ggc_strdup (label
),
3122 get_block_for_section (sect
), -1);
3125 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3126 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3127 SET_SYMBOL_REF_DECL (symbol
, desc
->value
);
3128 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3130 rtl
= gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3131 set_mem_attributes (rtl
, exp
, 1);
3132 set_mem_alias_set (rtl
, 0);
3133 set_mem_alias_set (rtl
, const_alias_set
);
3135 /* Set flags or add text to the name to record information, such as
3136 that it is a local symbol. If the name is changed, the macro
3137 ASM_OUTPUT_LABELREF will have to know how to strip this
3138 information. This call might invalidate our local variable
3139 SYMBOL; we can't use it afterward. */
3141 targetm
.encode_section_info (exp
, rtl
, true);
3148 /* Return an rtx representing a reference to constant data in memory
3149 for the constant expression EXP.
3151 If assembler code for such a constant has already been output,
3152 return an rtx to refer to it.
3153 Otherwise, output such a constant in memory
3154 and generate an rtx for it.
3156 If DEFER is nonzero, this constant can be deferred and output only
3157 if referenced in the function after all optimizations.
3159 `const_desc_table' records which constants already have label strings. */
3162 output_constant_def (tree exp
, int defer
)
3164 struct constant_descriptor_tree
*desc
;
3165 struct constant_descriptor_tree key
;
3168 /* Look up EXP in the table of constant descriptors. If we didn't find
3169 it, create a new one. */
3171 key
.hash
= const_hash_1 (exp
);
3172 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3177 desc
= build_constant_desc (exp
);
3178 desc
->hash
= key
.hash
;
3182 maybe_output_constant_def_contents (desc
, defer
);
3186 /* Subroutine of output_constant_def: Decide whether or not we need to
3187 output the constant DESC now, and if so, do it. */
3189 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3192 rtx symbol
= XEXP (desc
->rtl
, 0);
3193 tree exp
= desc
->value
;
3195 if (flag_syntax_only
)
3198 if (TREE_ASM_WRITTEN (exp
))
3199 /* Already output; don't do it again. */
3202 /* We can always defer constants as long as the context allows
3206 /* Increment n_deferred_constants if it exists. It needs to be at
3207 least as large as the number of constants actually referred to
3208 by the function. If it's too small we'll stop looking too early
3209 and fail to emit constants; if it's too large we'll only look
3210 through the entire function when we could have stopped earlier. */
3212 n_deferred_constants
++;
3216 output_constant_def_contents (symbol
);
3219 /* Subroutine of output_constant_def_contents. Output the definition
3220 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3221 constant's alignment in bits. */
3224 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3228 size
= get_constant_size (exp
);
3230 /* Do any machine/system dependent processing of the constant. */
3231 #ifdef ASM_DECLARE_CONSTANT_NAME
3232 ASM_DECLARE_CONSTANT_NAME (asm_out_file
, label
, exp
, size
);
3234 /* Standard thing is just output label for the constant. */
3235 ASM_OUTPUT_LABEL (asm_out_file
, label
);
3236 #endif /* ASM_DECLARE_CONSTANT_NAME */
3238 /* Output the value of EXP. */
3239 output_constant (exp
, size
, align
);
3242 /* We must output the constant data referred to by SYMBOL; do so. */
3245 output_constant_def_contents (rtx symbol
)
3247 tree exp
= SYMBOL_REF_DECL (symbol
);
3250 /* Make sure any other constants whose addresses appear in EXP
3251 are assigned label numbers. */
3252 output_addressed_constants (exp
);
3254 /* We are no longer deferring this constant. */
3255 TREE_ASM_WRITTEN (exp
) = 1;
3257 /* If the constant is part of an object block, make sure that the
3258 decl has been positioned within its block, but do not write out
3259 its definition yet. output_object_blocks will do that later. */
3260 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3261 place_block_symbol (symbol
);
3264 switch_to_section (get_constant_section (exp
));
3265 align
= get_constant_alignment (exp
);
3266 if (align
> BITS_PER_UNIT
)
3267 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3268 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3271 mudflap_enqueue_constant (exp
);
3274 /* Look up EXP in the table of constant descriptors. Return the rtl
3275 if it has been emitted, else null. */
3278 lookup_constant_def (tree exp
)
3280 struct constant_descriptor_tree
*desc
;
3281 struct constant_descriptor_tree key
;
3284 key
.hash
= const_hash_1 (exp
);
3285 desc
= htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3287 return (desc
? desc
->rtl
: NULL_RTX
);
3290 /* Used in the hash tables to avoid outputting the same constant
3291 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3292 are output once per function, not once per file. */
3293 /* ??? Only a few targets need per-function constant pools. Most
3294 can use one per-file pool. Should add a targetm bit to tell the
3297 struct rtx_constant_pool
GTY(())
3299 /* Pointers to first and last constant in pool, as ordered by offset. */
3300 struct constant_descriptor_rtx
*first
;
3301 struct constant_descriptor_rtx
*last
;
3303 /* Hash facility for making memory-constants from constant rtl-expressions.
3304 It is used on RISC machines where immediate integer arguments and
3305 constant addresses are restricted so that such constants must be stored
3307 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3309 /* Current offset in constant pool (does not include any
3310 machine-specific header). */
3311 HOST_WIDE_INT offset
;
3314 struct constant_descriptor_rtx
GTY((chain_next ("%h.next")))
3316 struct constant_descriptor_rtx
*next
;
3320 HOST_WIDE_INT offset
;
3322 enum machine_mode mode
;
3328 /* Hash and compare functions for const_rtx_htab. */
3331 const_desc_rtx_hash (const void *ptr
)
3333 const struct constant_descriptor_rtx
*desc
= ptr
;
3338 const_desc_rtx_eq (const void *a
, const void *b
)
3340 const struct constant_descriptor_rtx
*x
= a
;
3341 const struct constant_descriptor_rtx
*y
= b
;
3343 if (x
->mode
!= y
->mode
)
3345 return rtx_equal_p (x
->constant
, y
->constant
);
3348 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3351 const_rtx_hash_1 (rtx
*xp
, void *data
)
3353 unsigned HOST_WIDE_INT hwi
;
3354 enum machine_mode mode
;
3360 code
= GET_CODE (x
);
3361 mode
= GET_MODE (x
);
3362 h
= (hashval_t
) code
* 1048573 + mode
;
3370 const int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3371 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3374 h
^= (hashval_t
) hwi
;
3375 for (i
= 1; i
< n
; ++i
)
3378 h
^= (hashval_t
) hwi
;
3384 if (mode
== VOIDmode
)
3386 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3390 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3394 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3400 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3401 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3406 h
^= htab_hash_string (XSTR (x
, 0));
3410 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3414 case UNSPEC_VOLATILE
:
3415 h
= h
* 251 + XINT (x
, 1);
3423 *hp
= *hp
* 509 + h
;
3427 /* Compute a hash value for X, which should be a constant. */
3430 const_rtx_hash (rtx x
)
3433 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3438 /* Create and return a new rtx constant pool. */
3440 static struct rtx_constant_pool
*
3441 create_constant_pool (void)
3443 struct rtx_constant_pool
*pool
;
3445 pool
= ggc_alloc (sizeof (struct rtx_constant_pool
));
3446 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3447 const_desc_rtx_eq
, NULL
);
3454 /* Initialize constant pool hashing for a new function. */
3457 init_varasm_status (void)
3459 crtl
->varasm
.pool
= create_constant_pool ();
3460 crtl
->varasm
.deferred_constants
= 0;
3463 /* Given a MINUS expression, simplify it if both sides
3464 include the same symbol. */
3467 simplify_subtraction (rtx x
)
3469 rtx r
= simplify_rtx (x
);
3473 /* Given a constant rtx X, make (or find) a memory constant for its value
3474 and return a MEM rtx to refer to it in memory. */
3477 force_const_mem (enum machine_mode mode
, rtx x
)
3479 struct constant_descriptor_rtx
*desc
, tmp
;
3480 struct rtx_constant_pool
*pool
;
3487 /* If we're not allowed to drop X into the constant pool, don't. */
3488 if (targetm
.cannot_force_const_mem (x
))
3491 /* Record that this function has used a constant pool entry. */
3492 current_function_uses_const_pool
= 1;
3494 /* Decide which pool to use. */
3495 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3496 ? shared_constant_pool
3497 : crtl
->varasm
.pool
);
3499 /* Lookup the value in the hashtable. */
3502 hash
= const_rtx_hash (x
);
3503 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3506 /* If the constant was already present, return its memory. */
3508 return copy_rtx (desc
->mem
);
3510 /* Otherwise, create a new descriptor. */
3511 desc
= ggc_alloc (sizeof (*desc
));
3514 /* Align the location counter as required by EXP's data type. */
3515 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3516 #ifdef CONSTANT_ALIGNMENT
3518 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3519 if (type
!= NULL_TREE
)
3520 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3524 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3525 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3528 desc
->constant
= tmp
.constant
;
3529 desc
->offset
= pool
->offset
;
3532 desc
->align
= align
;
3533 desc
->labelno
= const_labelno
;
3536 pool
->offset
+= GET_MODE_SIZE (mode
);
3538 pool
->last
->next
= desc
;
3540 pool
->first
= pool
->last
= desc
;
3543 /* Create a string containing the label name, in LABEL. */
3544 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3547 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3548 the constants pool. */
3549 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3551 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3552 symbol
= create_block_symbol (ggc_strdup (label
),
3553 get_block_for_section (sect
), -1);
3556 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3558 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3559 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3560 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3562 /* Construct the MEM. */
3563 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3564 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3565 set_mem_align (def
, align
);
3567 /* If we're dropping a label to the constant pool, make sure we
3569 if (GET_CODE (x
) == LABEL_REF
)
3570 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3572 return copy_rtx (def
);
3575 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3578 get_pool_constant (rtx addr
)
3580 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3583 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3584 and whether it has been output or not. */
3587 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3589 struct constant_descriptor_rtx
*desc
;
3591 desc
= SYMBOL_REF_CONSTANT (addr
);
3592 *pmarked
= (desc
->mark
!= 0);
3593 return desc
->constant
;
3596 /* Similar, return the mode. */
3599 get_pool_mode (const_rtx addr
)
3601 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3604 /* Return the size of the constant pool. */
3607 get_pool_size (void)
3609 return crtl
->varasm
.pool
->offset
;
3612 /* Worker function for output_constant_pool_1. Emit assembly for X
3613 in MODE with known alignment ALIGN. */
3616 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3618 switch (GET_MODE_CLASS (mode
))
3621 case MODE_DECIMAL_FLOAT
:
3625 gcc_assert (GET_CODE (x
) == CONST_DOUBLE
);
3626 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3627 assemble_real (r
, mode
, align
);
3632 case MODE_PARTIAL_INT
:
3637 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3640 case MODE_VECTOR_FLOAT
:
3641 case MODE_VECTOR_INT
:
3642 case MODE_VECTOR_FRACT
:
3643 case MODE_VECTOR_UFRACT
:
3644 case MODE_VECTOR_ACCUM
:
3645 case MODE_VECTOR_UACCUM
:
3648 enum machine_mode submode
= GET_MODE_INNER (mode
);
3649 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3651 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3652 units
= CONST_VECTOR_NUNITS (x
);
3654 for (i
= 0; i
< units
; i
++)
3656 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3657 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3667 /* Worker function for output_constant_pool. Emit constant DESC,
3668 giving it ALIGN bits of alignment. */
3671 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3678 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3679 whose CODE_LABEL has been deleted. This can occur if a jump table
3680 is eliminated by optimization. If so, write a constant of zero
3681 instead. Note that this can also happen by turning the
3682 CODE_LABEL into a NOTE. */
3683 /* ??? This seems completely and utterly wrong. Certainly it's
3684 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3685 functioning even with INSN_DELETED_P and friends. */
3688 switch (GET_CODE (tmp
))
3691 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3692 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3694 tmp
= XEXP (XEXP (tmp
, 0), 0);
3698 tmp
= XEXP (tmp
, 0);
3699 gcc_assert (!INSN_DELETED_P (tmp
));
3700 gcc_assert (!NOTE_P (tmp
)
3701 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3708 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3709 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3710 align
, desc
->labelno
, done
);
3713 assemble_align (align
);
3715 /* Output the label. */
3716 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3718 /* Output the data. */
3719 output_constant_pool_2 (desc
->mode
, x
, align
);
3721 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3722 sections have proper size. */
3723 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3725 && (in_section
->common
.flags
& SECTION_MERGE
))
3726 assemble_align (align
);
3728 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3734 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3735 to as used. Emit referenced deferred strings. This function can
3736 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3739 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3741 rtx x
= *current_rtx
;
3743 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3746 if (CONSTANT_POOL_ADDRESS_P (x
))
3748 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3749 if (desc
->mark
== 0)
3752 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3755 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3757 tree exp
= SYMBOL_REF_DECL (x
);
3758 if (!TREE_ASM_WRITTEN (exp
))
3760 n_deferred_constants
--;
3761 output_constant_def_contents (x
);
3768 /* Look through appropriate parts of INSN, marking all entries in the
3769 constant pool which are actually being used. Entries that are only
3770 referenced by other constants are also marked as used. Emit
3771 deferred strings that are used. */
3774 mark_constants (rtx insn
)
3779 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3780 insns, not any notes that may be attached. We don't want to mark
3781 a constant just because it happens to appear in a REG_EQUIV note. */
3782 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3784 rtx seq
= PATTERN (insn
);
3785 int i
, n
= XVECLEN (seq
, 0);
3786 for (i
= 0; i
< n
; ++i
)
3788 rtx subinsn
= XVECEXP (seq
, 0, i
);
3789 if (INSN_P (subinsn
))
3790 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3794 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3797 /* Look through the instructions for this function, and mark all the
3798 entries in POOL which are actually being used. Emit deferred constants
3799 which have indeed been used. */
3802 mark_constant_pool (void)
3806 if (!current_function_uses_const_pool
&& n_deferred_constants
== 0)
3809 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3810 mark_constants (insn
);
3812 for (link
= current_function_epilogue_delay_list
;
3814 link
= XEXP (link
, 1))
3815 mark_constants (XEXP (link
, 0));
3818 /* Write all the constants in POOL. */
3821 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3823 struct constant_descriptor_rtx
*desc
;
3825 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3828 /* If the constant is part of an object_block, make sure that
3829 the constant has been positioned within its block, but do not
3830 write out its definition yet. output_object_blocks will do
3832 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3833 && SYMBOL_REF_BLOCK (desc
->sym
))
3834 place_block_symbol (desc
->sym
);
3837 switch_to_section (targetm
.asm_out
.select_rtx_section
3838 (desc
->mode
, desc
->constant
, desc
->align
));
3839 output_constant_pool_1 (desc
, desc
->align
);
3844 /* Mark all constants that are used in the current function, then write
3845 out the function's private constant pool. */
3848 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3849 tree fndecl ATTRIBUTE_UNUSED
)
3851 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3853 /* It is possible for gcc to call force_const_mem and then to later
3854 discard the instructions which refer to the constant. In such a
3855 case we do not need to output the constant. */
3856 mark_constant_pool ();
3858 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3859 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3862 output_constant_pool_contents (pool
);
3864 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3865 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3869 /* Write the contents of the shared constant pool. */
3872 output_shared_constant_pool (void)
3874 output_constant_pool_contents (shared_constant_pool
);
3877 /* Determine what kind of relocations EXP may need. */
3880 compute_reloc_for_constant (tree exp
)
3882 int reloc
= 0, reloc2
;
3885 switch (TREE_CODE (exp
))
3889 /* Go inside any operations that get_inner_reference can handle and see
3890 if what's inside is a constant: no need to do anything here for
3891 addresses of variables or functions. */
3892 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3893 tem
= TREE_OPERAND (tem
, 0))
3896 if (TREE_PUBLIC (tem
))
3903 case POINTER_PLUS_EXPR
:
3904 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3905 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3909 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3910 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3911 /* The difference of two local labels is computable at link time. */
3912 if (reloc
== 1 && reloc2
== 1)
3920 case NON_LVALUE_EXPR
:
3921 case VIEW_CONVERT_EXPR
:
3922 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3927 unsigned HOST_WIDE_INT idx
;
3928 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3930 reloc
|= compute_reloc_for_constant (tem
);
3940 /* Find all the constants whose addresses are referenced inside of EXP,
3941 and make sure assembler code with a label has been output for each one.
3942 Indicate whether an ADDR_EXPR has been encountered. */
3945 output_addressed_constants (tree exp
)
3949 switch (TREE_CODE (exp
))
3953 /* Go inside any operations that get_inner_reference can handle and see
3954 if what's inside is a constant: no need to do anything here for
3955 addresses of variables or functions. */
3956 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3957 tem
= TREE_OPERAND (tem
, 0))
3960 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3961 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
3962 tem
= DECL_INITIAL (tem
);
3964 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
3965 output_constant_def (tem
, 0);
3969 case POINTER_PLUS_EXPR
:
3971 output_addressed_constants (TREE_OPERAND (exp
, 1));
3976 case NON_LVALUE_EXPR
:
3977 case VIEW_CONVERT_EXPR
:
3978 output_addressed_constants (TREE_OPERAND (exp
, 0));
3983 unsigned HOST_WIDE_INT idx
;
3984 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3986 output_addressed_constants (tem
);
3995 /* Whether a constructor CTOR is a valid static constant initializer if all
3996 its elements are. This used to be internal to initializer_constant_valid_p
3997 and has been exposed to let other functions like categorize_ctor_elements
3998 evaluate the property while walking a constructor for other purposes. */
4001 constructor_static_from_elts_p (const_tree ctor
)
4003 return (TREE_CONSTANT (ctor
)
4004 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4005 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
)
4006 && !VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (ctor
)));
4009 /* Return nonzero if VALUE is a valid constant-valued expression
4010 for use in initializing a static variable; one that can be an
4011 element of a "constant" initializer.
4013 Return null_pointer_node if the value is absolute;
4014 if it is relocatable, return the variable that determines the relocation.
4015 We assume that VALUE has been folded as much as possible;
4016 therefore, we do not need to check for such things as
4017 arithmetic-combinations of integers. */
4020 initializer_constant_valid_p (tree value
, tree endtype
)
4022 switch (TREE_CODE (value
))
4025 if (constructor_static_from_elts_p (value
))
4027 unsigned HOST_WIDE_INT idx
;
4029 bool absolute
= true;
4031 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4034 reloc
= initializer_constant_valid_p (elt
, TREE_TYPE (elt
));
4037 if (reloc
!= null_pointer_node
)
4040 /* For a non-absolute relocation, there is no single
4041 variable that can be "the variable that determines the
4043 return absolute
? null_pointer_node
: error_mark_node
;
4046 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4054 return null_pointer_node
;
4058 value
= staticp (TREE_OPERAND (value
, 0));
4061 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out to
4062 be a constant, this is old-skool offsetof-like nonsense. */
4063 if (TREE_CODE (value
) == INDIRECT_REF
4064 && TREE_CONSTANT (TREE_OPERAND (value
, 0)))
4065 return null_pointer_node
;
4066 /* Taking the address of a nested function involves a trampoline. */
4067 if (TREE_CODE (value
) == FUNCTION_DECL
4068 && decl_function_context (value
)
4069 && !DECL_NO_STATIC_CHAIN (value
))
4071 /* "&{...}" requires a temporary to hold the constructed
4073 if (TREE_CODE (value
) == CONSTRUCTOR
)
4078 case VIEW_CONVERT_EXPR
:
4079 case NON_LVALUE_EXPR
:
4080 return initializer_constant_valid_p (TREE_OPERAND (value
, 0), endtype
);
4089 src
= TREE_OPERAND (value
, 0);
4090 src_type
= TREE_TYPE (src
);
4091 dest_type
= TREE_TYPE (value
);
4093 /* Allow conversions between pointer types, floating-point
4094 types, and offset types. */
4095 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4096 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4097 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4098 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4099 return initializer_constant_valid_p (src
, endtype
);
4101 /* Allow length-preserving conversions between integer types. */
4102 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4103 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4104 return initializer_constant_valid_p (src
, endtype
);
4106 /* Allow conversions between other integer types only if
4108 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4110 tree inner
= initializer_constant_valid_p (src
, endtype
);
4111 if (inner
== null_pointer_node
)
4112 return null_pointer_node
;
4116 /* Allow (int) &foo provided int is as wide as a pointer. */
4117 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4118 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4119 return initializer_constant_valid_p (src
, endtype
);
4121 /* Likewise conversions from int to pointers, but also allow
4122 conversions from 0. */
4123 if ((POINTER_TYPE_P (dest_type
)
4124 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4125 && INTEGRAL_TYPE_P (src_type
))
4127 if (TREE_CODE (src
) == INTEGER_CST
4128 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4129 return null_pointer_node
;
4130 if (integer_zerop (src
))
4131 return null_pointer_node
;
4132 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4133 return initializer_constant_valid_p (src
, endtype
);
4136 /* Allow conversions to struct or union types if the value
4138 if (TREE_CODE (dest_type
) == RECORD_TYPE
4139 || TREE_CODE (dest_type
) == UNION_TYPE
)
4140 return initializer_constant_valid_p (src
, endtype
);
4144 case POINTER_PLUS_EXPR
:
4146 if (! INTEGRAL_TYPE_P (endtype
)
4147 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4149 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4151 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4153 /* If either term is absolute, use the other term's relocation. */
4154 if (valid0
== null_pointer_node
)
4156 if (valid1
== null_pointer_node
)
4162 if (! INTEGRAL_TYPE_P (endtype
)
4163 || TYPE_PRECISION (endtype
) >= POINTER_SIZE
)
4165 tree valid0
= initializer_constant_valid_p (TREE_OPERAND (value
, 0),
4167 tree valid1
= initializer_constant_valid_p (TREE_OPERAND (value
, 1),
4169 /* Win if second argument is absolute. */
4170 if (valid1
== null_pointer_node
)
4172 /* Win if both arguments have the same relocation.
4173 Then the value is absolute. */
4174 if (valid0
== valid1
&& valid0
!= 0)
4175 return null_pointer_node
;
4177 /* Since GCC guarantees that string constants are unique in the
4178 generated code, a subtraction between two copies of the same
4179 constant string is absolute. */
4180 if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4181 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4182 && operand_equal_p (valid0
, valid1
, 1))
4183 return null_pointer_node
;
4186 /* Support narrowing differences. */
4187 if (INTEGRAL_TYPE_P (endtype
))
4191 op0
= TREE_OPERAND (value
, 0);
4192 op1
= TREE_OPERAND (value
, 1);
4194 /* Like STRIP_NOPS except allow the operand mode to widen.
4195 This works around a feature of fold that simplifies
4196 (int)(p1 - p2) to ((int)p1 - (int)p2) under the theory
4197 that the narrower operation is cheaper. */
4199 while (TREE_CODE (op0
) == NOP_EXPR
4200 || TREE_CODE (op0
) == CONVERT_EXPR
4201 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4203 tree inner
= TREE_OPERAND (op0
, 0);
4204 if (inner
== error_mark_node
4205 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4206 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4207 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4212 while (TREE_CODE (op1
) == NOP_EXPR
4213 || TREE_CODE (op1
) == CONVERT_EXPR
4214 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4216 tree inner
= TREE_OPERAND (op1
, 0);
4217 if (inner
== error_mark_node
4218 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4219 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4220 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4225 op0
= initializer_constant_valid_p (op0
, endtype
);
4226 op1
= initializer_constant_valid_p (op1
, endtype
);
4228 /* Both initializers must be known. */
4232 return null_pointer_node
;
4234 /* Support differences between labels. */
4235 if (TREE_CODE (op0
) == LABEL_DECL
4236 && TREE_CODE (op1
) == LABEL_DECL
)
4237 return null_pointer_node
;
4239 if (TREE_CODE (op0
) == STRING_CST
4240 && TREE_CODE (op1
) == STRING_CST
4241 && operand_equal_p (op0
, op1
, 1))
4242 return null_pointer_node
;
4254 /* Output assembler code for constant EXP to FILE, with no label.
4255 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4256 Assumes output_addressed_constants has been done on EXP already.
4258 Generate exactly SIZE bytes of assembler data, padding at the end
4259 with zeros if necessary. SIZE must always be specified.
4261 SIZE is important for structure constructors,
4262 since trailing members may have been omitted from the constructor.
4263 It is also important for initialization of arrays from string constants
4264 since the full length of the string constant might not be wanted.
4265 It is also needed for initialization of unions, where the initializer's
4266 type is just one member, and that may not be as long as the union.
4268 There a case in which we would fail to output exactly SIZE bytes:
4269 for a structure constructor that wants to produce more than SIZE bytes.
4270 But such constructors will never be generated for any possible input.
4272 ALIGN is the alignment of the data in bits. */
4275 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4277 enum tree_code code
;
4278 unsigned HOST_WIDE_INT thissize
;
4280 if (size
== 0 || flag_syntax_only
)
4283 /* See if we're trying to initialize a pointer in a non-default mode
4284 to the address of some declaration somewhere. If the target says
4285 the mode is valid for pointers, assume the target has a way of
4287 if (TREE_CODE (exp
) == NOP_EXPR
4288 && POINTER_TYPE_P (TREE_TYPE (exp
))
4289 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4291 tree saved_type
= TREE_TYPE (exp
);
4293 /* Peel off any intermediate conversions-to-pointer for valid
4295 while (TREE_CODE (exp
) == NOP_EXPR
4296 && POINTER_TYPE_P (TREE_TYPE (exp
))
4297 && targetm
.valid_pointer_mode (TYPE_MODE (TREE_TYPE (exp
))))
4298 exp
= TREE_OPERAND (exp
, 0);
4300 /* If what we're left with is the address of something, we can
4301 convert the address to the final type and output it that
4303 if (TREE_CODE (exp
) == ADDR_EXPR
)
4304 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4305 /* Likewise for constant ints. */
4306 else if (TREE_CODE (exp
) == INTEGER_CST
)
4307 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4308 TREE_INT_CST_HIGH (exp
));
4312 /* Eliminate any conversions since we'll be outputting the underlying
4314 while (TREE_CODE (exp
) == NOP_EXPR
|| TREE_CODE (exp
) == CONVERT_EXPR
4315 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4316 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4318 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4319 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4321 /* Make sure eliminating the conversion is really a no-op, except with
4322 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4323 union types to allow for Ada unchecked unions. */
4324 if (type_size
> op_size
4325 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4326 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4327 /* Keep the conversion. */
4330 exp
= TREE_OPERAND (exp
, 0);
4333 code
= TREE_CODE (TREE_TYPE (exp
));
4334 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4336 /* Allow a constructor with no elements for any data type.
4337 This means to fill the space with zeros. */
4338 if (TREE_CODE (exp
) == CONSTRUCTOR
4339 && VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (exp
)))
4341 assemble_zeros (size
);
4345 if (TREE_CODE (exp
) == FDESC_EXPR
)
4347 #ifdef ASM_OUTPUT_FDESC
4348 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4349 tree decl
= TREE_OPERAND (exp
, 0);
4350 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4357 /* Now output the underlying data. If we've handling the padding, return.
4358 Otherwise, break and ensure SIZE is the size written. */
4365 case REFERENCE_TYPE
:
4367 case FIXED_POINT_TYPE
:
4368 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4369 EXPAND_INITIALIZER
),
4370 MIN (size
, thissize
), align
, 0))
4371 error ("initializer for integer/fixed-point value is too complicated");
4375 if (TREE_CODE (exp
) != REAL_CST
)
4376 error ("initializer for floating value is not a floating constant");
4378 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4382 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4383 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4384 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4389 switch (TREE_CODE (exp
))
4392 output_constructor (exp
, size
, align
);
4395 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4397 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4404 unsigned int nalign
;
4405 enum machine_mode inner
;
4407 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4408 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4410 elt_size
= GET_MODE_SIZE (inner
);
4412 link
= TREE_VECTOR_CST_ELTS (exp
);
4413 output_constant (TREE_VALUE (link
), elt_size
, align
);
4414 thissize
= elt_size
;
4415 while ((link
= TREE_CHAIN (link
)) != NULL
)
4417 output_constant (TREE_VALUE (link
), elt_size
, nalign
);
4418 thissize
+= elt_size
;
4429 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4430 output_constructor (exp
, size
, align
);
4440 if (size
> thissize
)
4441 assemble_zeros (size
- thissize
);
4445 /* Subroutine of output_constructor, used for computing the size of
4446 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4447 type with an unspecified upper bound. */
4449 static unsigned HOST_WIDE_INT
4450 array_size_for_constructor (tree val
)
4453 unsigned HOST_WIDE_INT cnt
;
4454 tree index
, value
, tmp
;
4456 /* This code used to attempt to handle string constants that are not
4457 arrays of single-bytes, but nothing else does, so there's no point in
4459 if (TREE_CODE (val
) == STRING_CST
)
4460 return TREE_STRING_LENGTH (val
);
4462 max_index
= NULL_TREE
;
4463 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4465 if (TREE_CODE (index
) == RANGE_EXPR
)
4466 index
= TREE_OPERAND (index
, 1);
4467 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4471 if (max_index
== NULL_TREE
)
4474 /* Compute the total number of array elements. */
4475 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4476 i
= size_binop (MINUS_EXPR
, fold_convert (sizetype
, max_index
),
4477 fold_convert (sizetype
, tmp
));
4478 i
= size_binop (PLUS_EXPR
, i
, build_int_cst (sizetype
, 1));
4480 /* Multiply by the array element unit size to find number of bytes. */
4481 i
= size_binop (MULT_EXPR
, i
, TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4483 return tree_low_cst (i
, 1);
4486 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
4487 Generate at least SIZE bytes, padding if necessary. */
4490 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
4493 tree type
= TREE_TYPE (exp
);
4496 /* Number of bytes output or skipped so far.
4497 In other words, current position within the constructor. */
4498 HOST_WIDE_INT total_bytes
= 0;
4499 /* Nonzero means BYTE contains part of a byte, to be output. */
4500 int byte_buffer_in_use
= 0;
4502 unsigned HOST_WIDE_INT cnt
;
4503 constructor_elt
*ce
;
4505 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
4507 if (TREE_CODE (type
) == RECORD_TYPE
)
4508 field
= TYPE_FIELDS (type
);
4510 if (TREE_CODE (type
) == ARRAY_TYPE
4511 && TYPE_DOMAIN (type
) != 0)
4512 min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (type
));
4514 /* As LINK goes through the elements of the constant,
4515 FIELD goes through the structure fields, if the constant is a structure.
4516 if the constant is a union, then we override this,
4517 by getting the field from the TREE_LIST element.
4518 But the constant could also be an array. Then FIELD is zero.
4520 There is always a maximum of one element in the chain LINK for unions
4521 (even if the initializer in a source program incorrectly contains
4524 VEC_iterate (constructor_elt
, CONSTRUCTOR_ELTS (exp
), cnt
, ce
);
4525 cnt
++, field
= field
? TREE_CHAIN (field
) : 0)
4527 tree val
= ce
->value
;
4530 /* The element in a union constructor specifies the proper field
4532 if ((TREE_CODE (type
) == RECORD_TYPE
|| TREE_CODE (type
) == UNION_TYPE
4533 || TREE_CODE (type
) == QUAL_UNION_TYPE
)
4537 else if (TREE_CODE (type
) == ARRAY_TYPE
)
4540 #ifdef ASM_COMMENT_START
4541 if (field
&& flag_verbose_asm
)
4542 fprintf (asm_out_file
, "%s %s:\n",
4545 ? IDENTIFIER_POINTER (DECL_NAME (field
))
4549 /* Eliminate the marker that makes a cast not be an lvalue. */
4553 if (index
&& TREE_CODE (index
) == RANGE_EXPR
)
4555 unsigned HOST_WIDE_INT fieldsize
4556 = int_size_in_bytes (TREE_TYPE (type
));
4557 HOST_WIDE_INT lo_index
= tree_low_cst (TREE_OPERAND (index
, 0), 0);
4558 HOST_WIDE_INT hi_index
= tree_low_cst (TREE_OPERAND (index
, 1), 0);
4559 HOST_WIDE_INT index
;
4560 unsigned int align2
= min_align (align
, fieldsize
* BITS_PER_UNIT
);
4562 for (index
= lo_index
; index
<= hi_index
; index
++)
4564 /* Output the element's initial value. */
4566 assemble_zeros (fieldsize
);
4568 output_constant (val
, fieldsize
, align2
);
4570 /* Count its size. */
4571 total_bytes
+= fieldsize
;
4574 else if (field
== 0 || !DECL_BIT_FIELD (field
))
4576 /* An element that is not a bit-field. */
4578 unsigned HOST_WIDE_INT fieldsize
;
4579 /* Since this structure is static,
4580 we know the positions are constant. */
4581 HOST_WIDE_INT pos
= field
? int_byte_position (field
) : 0;
4582 unsigned int align2
;
4585 pos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (val
)), 1)
4586 * (tree_low_cst (index
, 0) - tree_low_cst (min_index
, 0)));
4588 /* Output any buffered-up bit-fields preceding this element. */
4589 if (byte_buffer_in_use
)
4591 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4593 byte_buffer_in_use
= 0;
4596 /* Advance to offset of this element.
4597 Note no alignment needed in an array, since that is guaranteed
4598 if each element has the proper size. */
4599 if ((field
!= 0 || index
!= 0) && pos
!= total_bytes
)
4601 gcc_assert (pos
>= total_bytes
);
4602 assemble_zeros (pos
- total_bytes
);
4606 /* Find the alignment of this element. */
4607 align2
= min_align (align
, BITS_PER_UNIT
* pos
);
4609 /* Determine size this element should occupy. */
4614 /* If this is an array with an unspecified upper bound,
4615 the initializer determines the size. */
4616 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4617 but we cannot do this until the deprecated support for
4618 initializing zero-length array members is removed. */
4619 if (TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
4620 && TYPE_DOMAIN (TREE_TYPE (field
))
4621 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (field
))))
4623 fieldsize
= array_size_for_constructor (val
);
4624 /* Given a non-empty initialization, this field had
4626 gcc_assert (!fieldsize
|| !TREE_CHAIN (field
));
4628 else if (DECL_SIZE_UNIT (field
))
4630 /* ??? This can't be right. If the decl size overflows
4631 a host integer we will silently emit no data. */
4632 if (host_integerp (DECL_SIZE_UNIT (field
), 1))
4633 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (field
), 1);
4637 fieldsize
= int_size_in_bytes (TREE_TYPE (type
));
4639 /* Output the element's initial value. */
4641 assemble_zeros (fieldsize
);
4643 output_constant (val
, fieldsize
, align2
);
4645 /* Count its size. */
4646 total_bytes
+= fieldsize
;
4648 else if (val
!= 0 && TREE_CODE (val
) != INTEGER_CST
)
4649 error ("invalid initial value for member %qs",
4650 IDENTIFIER_POINTER (DECL_NAME (field
)));
4653 /* Element that is a bit-field. */
4655 HOST_WIDE_INT next_offset
= int_bit_position (field
);
4656 HOST_WIDE_INT end_offset
4657 = (next_offset
+ tree_low_cst (DECL_SIZE (field
), 1));
4660 val
= integer_zero_node
;
4662 /* If this field does not start in this (or, next) byte,
4664 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4666 /* Output remnant of any bit field in previous bytes. */
4667 if (byte_buffer_in_use
)
4669 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4671 byte_buffer_in_use
= 0;
4674 /* If still not at proper byte, advance to there. */
4675 if (next_offset
/ BITS_PER_UNIT
!= total_bytes
)
4677 gcc_assert (next_offset
/ BITS_PER_UNIT
>= total_bytes
);
4678 assemble_zeros (next_offset
/ BITS_PER_UNIT
- total_bytes
);
4679 total_bytes
= next_offset
/ BITS_PER_UNIT
;
4683 if (! byte_buffer_in_use
)
4686 /* We must split the element into pieces that fall within
4687 separate bytes, and combine each byte with previous or
4688 following bit-fields. */
4690 /* next_offset is the offset n fbits from the beginning of
4691 the structure to the next bit of this element to be processed.
4692 end_offset is the offset of the first bit past the end of
4694 while (next_offset
< end_offset
)
4698 HOST_WIDE_INT value
;
4699 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4700 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4702 /* Advance from byte to byte
4703 within this element when necessary. */
4704 while (next_byte
!= total_bytes
)
4706 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4711 /* Number of bits we can process at once
4712 (all part of the same byte). */
4713 this_time
= MIN (end_offset
- next_offset
,
4714 BITS_PER_UNIT
- next_bit
);
4715 if (BYTES_BIG_ENDIAN
)
4717 /* On big-endian machine, take the most significant bits
4718 first (of the bits that are significant)
4719 and put them into bytes from the most significant end. */
4720 shift
= end_offset
- next_offset
- this_time
;
4722 /* Don't try to take a bunch of bits that cross
4723 the word boundary in the INTEGER_CST. We can
4724 only select bits from the LOW or HIGH part
4726 if (shift
< HOST_BITS_PER_WIDE_INT
4727 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4729 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4730 shift
= HOST_BITS_PER_WIDE_INT
;
4733 /* Now get the bits from the appropriate constant word. */
4734 if (shift
< HOST_BITS_PER_WIDE_INT
)
4735 value
= TREE_INT_CST_LOW (val
);
4738 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4739 value
= TREE_INT_CST_HIGH (val
);
4740 shift
-= HOST_BITS_PER_WIDE_INT
;
4743 /* Get the result. This works only when:
4744 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4745 byte
|= (((value
>> shift
)
4746 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4747 << (BITS_PER_UNIT
- this_time
- next_bit
));
4751 /* On little-endian machines,
4752 take first the least significant bits of the value
4753 and pack them starting at the least significant
4754 bits of the bytes. */
4755 shift
= next_offset
- int_bit_position (field
);
4757 /* Don't try to take a bunch of bits that cross
4758 the word boundary in the INTEGER_CST. We can
4759 only select bits from the LOW or HIGH part
4761 if (shift
< HOST_BITS_PER_WIDE_INT
4762 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4763 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
4765 /* Now get the bits from the appropriate constant word. */
4766 if (shift
< HOST_BITS_PER_WIDE_INT
)
4767 value
= TREE_INT_CST_LOW (val
);
4770 gcc_assert (shift
< 2 * HOST_BITS_PER_WIDE_INT
);
4771 value
= TREE_INT_CST_HIGH (val
);
4772 shift
-= HOST_BITS_PER_WIDE_INT
;
4775 /* Get the result. This works only when:
4776 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4777 byte
|= (((value
>> shift
)
4778 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4782 next_offset
+= this_time
;
4783 byte_buffer_in_use
= 1;
4788 if (byte_buffer_in_use
)
4790 assemble_integer (GEN_INT (byte
), 1, BITS_PER_UNIT
, 1);
4794 if ((unsigned HOST_WIDE_INT
)total_bytes
< size
)
4795 assemble_zeros (size
- total_bytes
);
4798 /* This TREE_LIST contains any weak symbol declarations waiting
4800 static GTY(()) tree weak_decls
;
4802 /* Mark DECL as weak. */
4805 mark_weak (tree decl
)
4807 DECL_WEAK (decl
) = 1;
4809 if (DECL_RTL_SET_P (decl
)
4810 && MEM_P (DECL_RTL (decl
))
4811 && XEXP (DECL_RTL (decl
), 0)
4812 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
4813 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
4816 /* Merge weak status between NEWDECL and OLDDECL. */
4819 merge_weak (tree newdecl
, tree olddecl
)
4821 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
4823 if (DECL_WEAK (newdecl
) && SUPPORTS_WEAK
)
4826 /* We put the NEWDECL on the weak_decls list at some point
4827 and OLDDECL as well. Keep just OLDDECL on the list. */
4828 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
4829 if (TREE_VALUE (*pwd
) == newdecl
)
4831 *pwd
= TREE_CHAIN (*pwd
);
4838 if (DECL_WEAK (newdecl
))
4842 /* NEWDECL is weak, but OLDDECL is not. */
4844 /* If we already output the OLDDECL, we're in trouble; we can't
4845 go back and make it weak. This error cannot be caught in
4846 declare_weak because the NEWDECL and OLDDECL was not yet
4847 been merged; therefore, TREE_ASM_WRITTEN was not set. */
4848 if (TREE_ASM_WRITTEN (olddecl
))
4849 error ("weak declaration of %q+D must precede definition",
4852 /* If we've already generated rtl referencing OLDDECL, we may
4853 have done so in a way that will not function properly with
4855 else if (TREE_USED (olddecl
)
4856 && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)))
4857 warning (0, "weak declaration of %q+D after first use results "
4858 "in unspecified behavior", newdecl
);
4862 /* We put the NEWDECL on the weak_decls list at some point.
4863 Replace it with the OLDDECL. */
4864 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
4865 if (TREE_VALUE (wd
) == newdecl
)
4867 TREE_VALUE (wd
) = olddecl
;
4870 /* We may not find the entry on the list. If NEWDECL is a
4871 weak alias, then we will have already called
4872 globalize_decl to remove the entry; in that case, we do
4873 not need to do anything. */
4876 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
4877 mark_weak (olddecl
);
4880 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
4881 weak. Just update NEWDECL to indicate that it's weak too. */
4882 mark_weak (newdecl
);
4885 /* Declare DECL to be a weak symbol. */
4888 declare_weak (tree decl
)
4890 if (! TREE_PUBLIC (decl
))
4891 error ("weak declaration of %q+D must be public", decl
);
4892 else if (TREE_CODE (decl
) == FUNCTION_DECL
&& TREE_ASM_WRITTEN (decl
))
4893 error ("weak declaration of %q+D must precede definition", decl
);
4894 else if (SUPPORTS_WEAK
)
4896 if (! DECL_WEAK (decl
))
4897 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
4900 warning (0, "weak declaration of %q+D not supported", decl
);
4906 weak_finish_1 (tree decl
)
4908 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
4909 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
4912 if (! TREE_USED (decl
))
4915 #ifdef ASM_WEAKEN_DECL
4916 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
4918 #ifdef ASM_WEAKEN_LABEL
4919 ASM_WEAKEN_LABEL (asm_out_file
, name
);
4921 #ifdef ASM_OUTPUT_WEAK_ALIAS
4923 static bool warn_once
= 0;
4926 warning (0, "only weak aliases are supported in this configuration");
4936 /* This TREE_LIST contains weakref targets. */
4938 static GTY(()) tree weakref_targets
;
4940 /* Forward declaration. */
4941 static tree
find_decl_and_mark_needed (tree decl
, tree target
);
4943 /* Emit any pending weak declarations. */
4950 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
4952 tree alias_decl
= TREE_PURPOSE (t
);
4953 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
4955 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
4956 /* Remove alias_decl from the weak list, but leave entries for
4957 the target alone. */
4959 #ifndef ASM_OUTPUT_WEAKREF
4960 else if (! TREE_SYMBOL_REFERENCED (target
))
4962 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
4963 defined, otherwise we and weak_finish_1 would use
4964 different macros. */
4965 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
4966 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
4968 tree decl
= find_decl_and_mark_needed (alias_decl
, target
);
4972 decl
= build_decl (TREE_CODE (alias_decl
), target
,
4973 TREE_TYPE (alias_decl
));
4975 DECL_EXTERNAL (decl
) = 1;
4976 TREE_PUBLIC (decl
) = 1;
4977 DECL_ARTIFICIAL (decl
) = 1;
4978 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
4979 TREE_USED (decl
) = 1;
4982 weak_finish_1 (decl
);
4991 /* Remove the alias and the target from the pending weak list
4992 so that we do not emit any .weak directives for the former,
4993 nor multiple .weak directives for the latter. */
4994 for (p
= &weak_decls
; (t2
= *p
) ; )
4996 if (TREE_VALUE (t2
) == alias_decl
4997 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
4998 *p
= TREE_CHAIN (t2
);
5000 p
= &TREE_CHAIN (t2
);
5003 /* Remove other weakrefs to the same target, to speed things up. */
5004 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5006 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5007 *p
= TREE_CHAIN (t2
);
5009 p
= &TREE_CHAIN (t2
);
5014 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5016 tree decl
= TREE_VALUE (t
);
5018 weak_finish_1 (decl
);
5022 /* Emit the assembly bits to indicate that DECL is globally visible. */
5025 globalize_decl (tree decl
)
5028 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5029 if (DECL_WEAK (decl
))
5031 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5034 #ifdef ASM_WEAKEN_DECL
5035 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5037 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5040 /* Remove this function from the pending weak list so that
5041 we do not emit multiple .weak directives for it. */
5042 for (p
= &weak_decls
; (t
= *p
) ; )
5044 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5045 *p
= TREE_CHAIN (t
);
5047 p
= &TREE_CHAIN (t
);
5050 /* Remove weakrefs to the same target from the pending weakref
5051 list, for the same reason. */
5052 for (p
= &weakref_targets
; (t
= *p
) ; )
5054 if (DECL_ASSEMBLER_NAME (decl
)
5055 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5056 *p
= TREE_CHAIN (t
);
5058 p
= &TREE_CHAIN (t
);
5065 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5068 /* We have to be able to tell cgraph about the needed-ness of the target
5069 of an alias. This requires that the decl have been defined. Aliases
5070 that precede their definition have to be queued for later processing. */
5072 typedef struct alias_pair
GTY(())
5078 /* Define gc'd vector type. */
5079 DEF_VEC_O(alias_pair
);
5080 DEF_VEC_ALLOC_O(alias_pair
,gc
);
5082 static GTY(()) VEC(alias_pair
,gc
) *alias_pairs
;
5084 /* Given an assembly name, find the decl it is associated with. At the
5085 same time, mark it needed for cgraph. */
5088 find_decl_and_mark_needed (tree decl
, tree target
)
5090 struct cgraph_node
*fnode
= NULL
;
5091 struct varpool_node
*vnode
= NULL
;
5093 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5095 fnode
= cgraph_node_for_asm (target
);
5097 vnode
= varpool_node_for_asm (target
);
5101 vnode
= varpool_node_for_asm (target
);
5103 fnode
= cgraph_node_for_asm (target
);
5108 /* We can't mark function nodes as used after cgraph global info
5109 is finished. This wouldn't generally be necessary, but C++
5110 virtual table thunks are introduced late in the game and
5111 might seem like they need marking, although in fact they
5113 if (! cgraph_global_info_ready
)
5114 cgraph_mark_needed_node (fnode
);
5119 varpool_mark_needed_node (vnode
);
5126 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5127 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5128 tree node is DECL to have the value of the tree node TARGET. */
5131 do_assemble_alias (tree decl
, tree target
)
5133 if (TREE_ASM_WRITTEN (decl
))
5136 TREE_ASM_WRITTEN (decl
) = 1;
5137 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5139 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5141 ultimate_transparent_alias_target (&target
);
5143 if (!targetm
.have_tls
5144 && TREE_CODE (decl
) == VAR_DECL
5145 && DECL_THREAD_LOCAL_P (decl
))
5147 decl
= emutls_decl (decl
);
5148 target
= get_emutls_object_name (target
);
5151 if (!TREE_SYMBOL_REFERENCED (target
))
5152 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5154 #ifdef ASM_OUTPUT_WEAKREF
5155 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5156 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5157 IDENTIFIER_POINTER (target
));
5161 error ("%Jweakref is not supported in this configuration", decl
);
5168 if (!targetm
.have_tls
5169 && TREE_CODE (decl
) == VAR_DECL
5170 && DECL_THREAD_LOCAL_P (decl
))
5172 decl
= emutls_decl (decl
);
5173 target
= get_emutls_object_name (target
);
5176 #ifdef ASM_OUTPUT_DEF
5177 /* Make name accessible from other files, if appropriate. */
5179 if (TREE_PUBLIC (decl
))
5181 globalize_decl (decl
);
5182 maybe_assemble_visibility (decl
);
5185 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5186 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5188 ASM_OUTPUT_DEF (asm_out_file
,
5189 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5190 IDENTIFIER_POINTER (target
));
5192 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5197 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5198 # ifdef ASM_WEAKEN_DECL
5199 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5201 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5203 /* Remove this function from the pending weak list so that
5204 we do not emit multiple .weak directives for it. */
5205 for (p
= &weak_decls
; (t
= *p
) ; )
5206 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5207 *p
= TREE_CHAIN (t
);
5209 p
= &TREE_CHAIN (t
);
5211 /* Remove weakrefs to the same target from the pending weakref
5212 list, for the same reason. */
5213 for (p
= &weakref_targets
; (t
= *p
) ; )
5215 if (DECL_ASSEMBLER_NAME (decl
)
5216 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5217 *p
= TREE_CHAIN (t
);
5219 p
= &TREE_CHAIN (t
);
5225 /* First pass of completing pending aliases. Make sure that cgraph knows
5226 which symbols will be required. */
5229 finish_aliases_1 (void)
5234 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5238 target_decl
= find_decl_and_mark_needed (p
->decl
, p
->target
);
5239 if (target_decl
== NULL
)
5241 if (! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5242 error ("%q+D aliased to undefined symbol %qs",
5243 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5245 else if (DECL_EXTERNAL (target_decl
)
5246 && ! lookup_attribute ("weakref", DECL_ATTRIBUTES (p
->decl
)))
5247 error ("%q+D aliased to external symbol %qs",
5248 p
->decl
, IDENTIFIER_POINTER (p
->target
));
5252 /* Second pass of completing pending aliases. Emit the actual assembly.
5253 This happens at the end of compilation and thus it is assured that the
5254 target symbol has been emitted. */
5257 finish_aliases_2 (void)
5262 for (i
= 0; VEC_iterate (alias_pair
, alias_pairs
, i
, p
); i
++)
5263 do_assemble_alias (p
->decl
, p
->target
);
5265 VEC_truncate (alias_pair
, alias_pairs
, 0);
5268 /* Emit an assembler directive to make the symbol for DECL an alias to
5269 the symbol for TARGET. */
5272 assemble_alias (tree decl
, tree target
)
5275 bool is_weakref
= false;
5277 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5279 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5283 ultimate_transparent_alias_target (&target
);
5285 if (alias
== target
)
5286 error ("weakref %q+D ultimately targets itself", decl
);
5289 #ifndef ASM_OUTPUT_WEAKREF
5290 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5291 TREE_CHAIN (alias
) = target
;
5294 if (TREE_PUBLIC (decl
))
5295 error ("weakref %q+D must have static linkage", decl
);
5299 #if !defined (ASM_OUTPUT_DEF)
5300 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5301 error ("%Jalias definitions not supported in this configuration", decl
);
5304 if (!DECL_WEAK (decl
))
5306 error ("%Jonly weak aliases are supported in this configuration", decl
);
5313 /* We must force creation of DECL_RTL for debug info generation, even though
5314 we don't use it here. */
5315 make_decl_rtl (decl
);
5316 TREE_USED (decl
) = 1;
5318 /* A quirk of the initial implementation of aliases required that the user
5319 add "extern" to all of them. Which is silly, but now historical. Do
5320 note that the symbol is in fact locally defined. */
5322 DECL_EXTERNAL (decl
) = 0;
5324 /* Allow aliases to aliases. */
5325 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5326 cgraph_node (decl
)->alias
= true;
5328 varpool_node (decl
)->alias
= true;
5330 /* If the target has already been emitted, we don't have to queue the
5331 alias. This saves a tad of memory. */
5332 target_decl
= find_decl_and_mark_needed (decl
, target
);
5333 if (target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5334 do_assemble_alias (decl
, target
);
5337 alias_pair
*p
= VEC_safe_push (alias_pair
, gc
, alias_pairs
, NULL
);
5343 /* Emit an assembler directive to set symbol for DECL visibility to
5344 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5347 default_assemble_visibility (tree decl
, int vis
)
5349 static const char * const visibility_types
[] = {
5350 NULL
, "protected", "hidden", "internal"
5353 const char *name
, *type
;
5355 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5356 type
= visibility_types
[vis
];
5358 #ifdef HAVE_GAS_HIDDEN
5359 fprintf (asm_out_file
, "\t.%s\t", type
);
5360 assemble_name (asm_out_file
, name
);
5361 fprintf (asm_out_file
, "\n");
5363 warning (OPT_Wattributes
, "visibility attribute not supported "
5364 "in this configuration; ignored");
5368 /* A helper function to call assemble_visibility when needed for a decl. */
5371 maybe_assemble_visibility (tree decl
)
5373 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5375 if (vis
!= VISIBILITY_DEFAULT
)
5377 targetm
.asm_out
.visibility (decl
, vis
);
5384 /* Returns 1 if the target configuration supports defining public symbols
5385 so that one of them will be chosen at link time instead of generating a
5386 multiply-defined symbol error, whether through the use of weak symbols or
5387 a target-specific mechanism for having duplicates discarded. */
5390 supports_one_only (void)
5392 if (SUPPORTS_ONE_ONLY
)
5394 return SUPPORTS_WEAK
;
5397 /* Set up DECL as a public symbol that can be defined in multiple
5398 translation units without generating a linker error. */
5401 make_decl_one_only (tree decl
)
5403 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5404 || TREE_CODE (decl
) == FUNCTION_DECL
);
5406 TREE_PUBLIC (decl
) = 1;
5408 if (SUPPORTS_ONE_ONLY
)
5410 #ifdef MAKE_DECL_ONE_ONLY
5411 MAKE_DECL_ONE_ONLY (decl
);
5413 DECL_ONE_ONLY (decl
) = 1;
5415 else if (TREE_CODE (decl
) == VAR_DECL
5416 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5417 DECL_COMMON (decl
) = 1;
5420 gcc_assert (SUPPORTS_WEAK
);
5421 DECL_WEAK (decl
) = 1;
5426 init_varasm_once (void)
5428 section_htab
= htab_create_ggc (31, section_entry_hash
,
5429 section_entry_eq
, NULL
);
5430 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5431 object_block_entry_eq
, NULL
);
5432 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5433 const_desc_eq
, NULL
);
5435 const_alias_set
= new_alias_set ();
5436 shared_constant_pool
= create_constant_pool ();
5438 #ifdef TEXT_SECTION_ASM_OP
5439 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5440 TEXT_SECTION_ASM_OP
);
5443 #ifdef DATA_SECTION_ASM_OP
5444 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5445 DATA_SECTION_ASM_OP
);
5448 #ifdef SDATA_SECTION_ASM_OP
5449 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5450 SDATA_SECTION_ASM_OP
);
5453 #ifdef READONLY_DATA_SECTION_ASM_OP
5454 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5455 READONLY_DATA_SECTION_ASM_OP
);
5458 #ifdef CTORS_SECTION_ASM_OP
5459 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5460 CTORS_SECTION_ASM_OP
);
5463 #ifdef DTORS_SECTION_ASM_OP
5464 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5465 DTORS_SECTION_ASM_OP
);
5468 #ifdef BSS_SECTION_ASM_OP
5469 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5470 output_section_asm_op
,
5471 BSS_SECTION_ASM_OP
);
5474 #ifdef SBSS_SECTION_ASM_OP
5475 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5476 output_section_asm_op
,
5477 SBSS_SECTION_ASM_OP
);
5480 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5481 | SECTION_COMMON
, emit_tls_common
);
5482 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5483 | SECTION_COMMON
, emit_local
);
5484 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5485 | SECTION_COMMON
, emit_common
);
5487 #if defined ASM_OUTPUT_ALIGNED_BSS || defined ASM_OUTPUT_BSS
5488 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5492 targetm
.asm_out
.init_sections ();
5494 if (readonly_data_section
== NULL
)
5495 readonly_data_section
= text_section
;
5499 decl_default_tls_model (const_tree decl
)
5501 enum tls_model kind
;
5504 is_local
= targetm
.binds_local_p (decl
);
5508 kind
= TLS_MODEL_LOCAL_EXEC
;
5510 kind
= TLS_MODEL_INITIAL_EXEC
;
5513 /* Local dynamic is inefficient when we're not combining the
5514 parts of the address. */
5515 else if (optimize
&& is_local
)
5516 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5518 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5519 if (kind
< flag_tls_default
)
5520 kind
= flag_tls_default
;
5525 /* Select a set of attributes for section NAME based on the properties
5526 of DECL and whether or not RELOC indicates that DECL's initializer
5527 might contain runtime relocations.
5529 We make the section read-only and executable for a function decl,
5530 read-only for a const data decl, and writable for a non-const data decl. */
5533 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5537 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5538 flags
= SECTION_CODE
;
5539 else if (decl
&& decl_readonly_section (decl
, reloc
))
5541 else if (current_function_decl
5543 && crtl
->subsections
.unlikely_text_section_name
5544 && strcmp (name
, crtl
->subsections
.unlikely_text_section_name
) == 0)
5545 flags
= SECTION_CODE
;
5547 && (!current_function_decl
|| !cfun
)
5548 && strcmp (name
, UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
5549 flags
= SECTION_CODE
;
5551 flags
= SECTION_WRITE
;
5553 if (decl
&& DECL_ONE_ONLY (decl
))
5554 flags
|= SECTION_LINKONCE
;
5556 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5557 flags
|= SECTION_TLS
| SECTION_WRITE
;
5559 if (strcmp (name
, ".bss") == 0
5560 || strncmp (name
, ".bss.", 5) == 0
5561 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
5562 || strcmp (name
, ".sbss") == 0
5563 || strncmp (name
, ".sbss.", 6) == 0
5564 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
5565 flags
|= SECTION_BSS
;
5567 if (strcmp (name
, ".tdata") == 0
5568 || strncmp (name
, ".tdata.", 7) == 0
5569 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
5570 flags
|= SECTION_TLS
;
5572 if (strcmp (name
, ".tbss") == 0
5573 || strncmp (name
, ".tbss.", 6) == 0
5574 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
5575 flags
|= SECTION_TLS
| SECTION_BSS
;
5577 /* These three sections have special ELF types. They are neither
5578 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5579 want to print a section type (@progbits or @nobits). If someone
5580 is silly enough to emit code or TLS variables to one of these
5581 sections, then don't handle them specially. */
5582 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
5583 && (strcmp (name
, ".init_array") == 0
5584 || strcmp (name
, ".fini_array") == 0
5585 || strcmp (name
, ".preinit_array") == 0))
5586 flags
|= SECTION_NOTYPE
;
5591 /* Return true if the target supports some form of global BSS,
5592 either through bss_noswitch_section, or by selecting a BSS
5593 section in TARGET_ASM_SELECT_SECTION. */
5596 have_global_bss_p (void)
5598 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
5601 /* Output assembly to switch to section NAME with attribute FLAGS.
5602 Four variants for common object file formats. */
5605 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
5606 unsigned int flags ATTRIBUTE_UNUSED
,
5607 tree decl ATTRIBUTE_UNUSED
)
5609 /* Some object formats don't support named sections at all. The
5610 front-end should already have flagged this as an error. */
5615 default_elf_asm_named_section (const char *name
, unsigned int flags
,
5616 tree decl ATTRIBUTE_UNUSED
)
5618 char flagchars
[10], *f
= flagchars
;
5620 /* If we have already declared this section, we can use an
5621 abbreviated form to switch back to it -- unless this section is
5622 part of a COMDAT groups, in which case GAS requires the full
5623 declaration every time. */
5624 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5625 && (flags
& SECTION_DECLARED
))
5627 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
5631 if (!(flags
& SECTION_DEBUG
))
5633 if (flags
& SECTION_WRITE
)
5635 if (flags
& SECTION_CODE
)
5637 if (flags
& SECTION_SMALL
)
5639 if (flags
& SECTION_MERGE
)
5641 if (flags
& SECTION_STRINGS
)
5643 if (flags
& SECTION_TLS
)
5645 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5649 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
5651 if (!(flags
& SECTION_NOTYPE
))
5656 if (flags
& SECTION_BSS
)
5662 #ifdef ASM_COMMENT_START
5663 /* On platforms that use "@" as the assembly comment character,
5665 if (strcmp (ASM_COMMENT_START
, "@") == 0)
5668 fprintf (asm_out_file
, format
, type
);
5670 if (flags
& SECTION_ENTSIZE
)
5671 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
5672 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
5673 fprintf (asm_out_file
, ",%s,comdat",
5674 lang_hooks
.decls
.comdat_group (decl
));
5677 putc ('\n', asm_out_file
);
5681 default_coff_asm_named_section (const char *name
, unsigned int flags
,
5682 tree decl ATTRIBUTE_UNUSED
)
5684 char flagchars
[8], *f
= flagchars
;
5686 if (flags
& SECTION_WRITE
)
5688 if (flags
& SECTION_CODE
)
5692 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
5696 default_pe_asm_named_section (const char *name
, unsigned int flags
,
5699 default_coff_asm_named_section (name
, flags
, decl
);
5701 if (flags
& SECTION_LINKONCE
)
5703 /* Functions may have been compiled at various levels of
5704 optimization so we can't use `same_size' here.
5705 Instead, have the linker pick one. */
5706 fprintf (asm_out_file
, "\t.linkonce %s\n",
5707 (flags
& SECTION_CODE
? "discard" : "same_size"));
5711 /* The lame default section selector. */
5714 default_select_section (tree decl
, int reloc
,
5715 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
5719 if (decl_readonly_section (decl
, reloc
))
5720 return readonly_data_section
;
5722 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5724 if (! ((flag_pic
&& reloc
)
5725 || !TREE_READONLY (decl
)
5726 || TREE_SIDE_EFFECTS (decl
)
5727 || !TREE_CONSTANT (decl
)))
5728 return readonly_data_section
;
5730 else if (TREE_CODE (decl
) == STRING_CST
)
5731 return readonly_data_section
;
5732 else if (! (flag_pic
&& reloc
))
5733 return readonly_data_section
;
5735 return data_section
;
5738 enum section_category
5739 categorize_decl_for_section (const_tree decl
, int reloc
)
5741 enum section_category ret
;
5743 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5745 else if (TREE_CODE (decl
) == STRING_CST
)
5747 if (flag_mudflap
) /* or !flag_merge_constants */
5748 return SECCAT_RODATA
;
5750 return SECCAT_RODATA_MERGE_STR
;
5752 else if (TREE_CODE (decl
) == VAR_DECL
)
5754 if (bss_initializer_p (decl
))
5756 else if (! TREE_READONLY (decl
)
5757 || TREE_SIDE_EFFECTS (decl
)
5758 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
5760 /* Here the reloc_rw_mask is not testing whether the section should
5761 be read-only or not, but whether the dynamic link will have to
5762 do something. If so, we wish to segregate the data in order to
5763 minimize cache misses inside the dynamic linker. */
5764 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
5765 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
5769 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
5770 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
5771 else if (reloc
|| flag_merge_constants
< 2)
5772 /* C and C++ don't allow different variables to share the same
5773 location. -fmerge-all-constants allows even that (at the
5774 expense of not conforming). */
5775 ret
= SECCAT_RODATA
;
5776 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
5777 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
5779 ret
= SECCAT_RODATA_MERGE_CONST
;
5781 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
5783 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
5784 || TREE_SIDE_EFFECTS (decl
)
5785 || ! TREE_CONSTANT (decl
))
5788 ret
= SECCAT_RODATA
;
5791 ret
= SECCAT_RODATA
;
5793 /* There are no read-only thread-local sections. */
5794 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5796 /* Note that this would be *just* SECCAT_BSS, except that there's
5797 no concept of a read-only thread-local-data section. */
5798 if (ret
== SECCAT_BSS
5799 || (flag_zero_initialized_in_bss
5800 && initializer_zerop (DECL_INITIAL (decl
))))
5806 /* If the target uses small data sections, select it. */
5807 else if (targetm
.in_small_data_p (decl
))
5809 if (ret
== SECCAT_BSS
)
5811 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
5812 ret
= SECCAT_SRODATA
;
5821 decl_readonly_section (const_tree decl
, int reloc
)
5823 switch (categorize_decl_for_section (decl
, reloc
))
5826 case SECCAT_RODATA_MERGE_STR
:
5827 case SECCAT_RODATA_MERGE_STR_INIT
:
5828 case SECCAT_RODATA_MERGE_CONST
:
5829 case SECCAT_SRODATA
:
5838 /* Select a section based on the above categorization. */
5841 default_elf_select_section (tree decl
, int reloc
,
5842 unsigned HOST_WIDE_INT align
)
5845 switch (categorize_decl_for_section (decl
, reloc
))
5848 /* We're not supposed to be called on FUNCTION_DECLs. */
5851 return readonly_data_section
;
5852 case SECCAT_RODATA_MERGE_STR
:
5853 return mergeable_string_section (decl
, align
, 0);
5854 case SECCAT_RODATA_MERGE_STR_INIT
:
5855 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
5856 case SECCAT_RODATA_MERGE_CONST
:
5857 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
5858 case SECCAT_SRODATA
:
5862 return data_section
;
5863 case SECCAT_DATA_REL
:
5864 sname
= ".data.rel";
5866 case SECCAT_DATA_REL_LOCAL
:
5867 sname
= ".data.rel.local";
5869 case SECCAT_DATA_REL_RO
:
5870 sname
= ".data.rel.ro";
5872 case SECCAT_DATA_REL_RO_LOCAL
:
5873 sname
= ".data.rel.ro.local";
5898 return get_named_section (decl
, sname
, reloc
);
5901 /* Construct a unique section name based on the decl name and the
5902 categorization performed above. */
5905 default_unique_section (tree decl
, int reloc
)
5907 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
5908 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
5909 const char *prefix
, *name
;
5913 switch (categorize_decl_for_section (decl
, reloc
))
5916 prefix
= one_only
? ".gnu.linkonce.t." : ".text.";
5919 case SECCAT_RODATA_MERGE_STR
:
5920 case SECCAT_RODATA_MERGE_STR_INIT
:
5921 case SECCAT_RODATA_MERGE_CONST
:
5922 prefix
= one_only
? ".gnu.linkonce.r." : ".rodata.";
5924 case SECCAT_SRODATA
:
5925 prefix
= one_only
? ".gnu.linkonce.s2." : ".sdata2.";
5928 prefix
= one_only
? ".gnu.linkonce.d." : ".data.";
5930 case SECCAT_DATA_REL
:
5931 prefix
= one_only
? ".gnu.linkonce.d.rel." : ".data.rel.";
5933 case SECCAT_DATA_REL_LOCAL
:
5934 prefix
= one_only
? ".gnu.linkonce.d.rel.local." : ".data.rel.local.";
5936 case SECCAT_DATA_REL_RO
:
5937 prefix
= one_only
? ".gnu.linkonce.d.rel.ro." : ".data.rel.ro.";
5939 case SECCAT_DATA_REL_RO_LOCAL
:
5940 prefix
= one_only
? ".gnu.linkonce.d.rel.ro.local."
5941 : ".data.rel.ro.local.";
5944 prefix
= one_only
? ".gnu.linkonce.s." : ".sdata.";
5947 prefix
= one_only
? ".gnu.linkonce.b." : ".bss.";
5950 prefix
= one_only
? ".gnu.linkonce.sb." : ".sbss.";
5953 prefix
= one_only
? ".gnu.linkonce.td." : ".tdata.";
5956 prefix
= one_only
? ".gnu.linkonce.tb." : ".tbss.";
5961 plen
= strlen (prefix
);
5963 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5964 name
= targetm
.strip_name_encoding (name
);
5965 nlen
= strlen (name
);
5967 string
= alloca (nlen
+ plen
+ 1);
5968 memcpy (string
, prefix
, plen
);
5969 memcpy (string
+ plen
, name
, nlen
+ 1);
5971 DECL_SECTION_NAME (decl
) = build_string (nlen
+ plen
, string
);
5974 /* Like compute_reloc_for_constant, except for an RTX. The return value
5975 is a mask for which bit 1 indicates a global relocation, and bit 0
5976 indicates a local relocation. */
5979 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
5984 switch (GET_CODE (x
))
5987 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6000 compute_reloc_for_rtx (rtx x
)
6004 switch (GET_CODE (x
))
6010 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6019 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6021 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6023 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6024 return data_section
;
6026 return readonly_data_section
;
6030 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6031 unsigned HOST_WIDE_INT align
)
6033 int reloc
= compute_reloc_for_rtx (x
);
6035 /* ??? Handle small data here somehow. */
6037 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6040 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6042 return get_named_section (NULL
, ".data.rel.ro", 3);
6045 return mergeable_constant_section (mode
, align
, 0);
6048 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6051 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6056 /* Careful not to prod global register variables. */
6059 symbol
= XEXP (rtl
, 0);
6060 if (GET_CODE (symbol
) != SYMBOL_REF
)
6063 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6064 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6065 flags
|= SYMBOL_FLAG_FUNCTION
;
6066 if (targetm
.binds_local_p (decl
))
6067 flags
|= SYMBOL_FLAG_LOCAL
;
6068 if (targetm
.have_tls
&& TREE_CODE (decl
) == VAR_DECL
6069 && DECL_THREAD_LOCAL_P (decl
))
6070 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6071 else if (targetm
.in_small_data_p (decl
))
6072 flags
|= SYMBOL_FLAG_SMALL
;
6073 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6074 being PUBLIC, the thing *must* be defined in this translation unit.
6075 Prevent this buglet from being propagated into rtl code as well. */
6076 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6077 flags
|= SYMBOL_FLAG_EXTERNAL
;
6079 SYMBOL_REF_FLAGS (symbol
) = flags
;
6082 /* By default, we do nothing for encode_section_info, so we need not
6083 do anything but discard the '*' marker. */
6086 default_strip_name_encoding (const char *str
)
6088 return str
+ (*str
== '*');
6091 #ifdef ASM_OUTPUT_DEF
6092 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6093 anchor relative to ".", the current section position. */
6096 default_asm_output_anchor (rtx symbol
)
6100 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6101 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6102 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6106 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6109 default_use_anchors_for_symbol_p (const_rtx symbol
)
6114 /* Don't use anchors for mergeable sections. The linker might move
6115 the objects around. */
6116 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6117 if (sect
->common
.flags
& SECTION_MERGE
)
6120 /* Don't use anchors for small data sections. The small data register
6121 acts as an anchor for such sections. */
6122 if (sect
->common
.flags
& SECTION_SMALL
)
6125 decl
= SYMBOL_REF_DECL (symbol
);
6126 if (decl
&& DECL_P (decl
))
6128 /* Don't use section anchors for decls that might be defined by
6130 if (!targetm
.binds_local_p (decl
))
6133 /* Don't use section anchors for decls that will be placed in a
6134 small data section. */
6135 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6136 one above. The problem is that we only use SECTION_SMALL for
6137 sections that should be marked as small in the section directive. */
6138 if (targetm
.in_small_data_p (decl
))
6144 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6145 wrt cross-module name binding. */
6148 default_binds_local_p (const_tree exp
)
6150 return default_binds_local_p_1 (exp
, flag_shlib
);
6154 default_binds_local_p_1 (const_tree exp
, int shlib
)
6158 /* A non-decl is an entry in the constant pool. */
6161 /* Weakrefs may not bind locally, even though the weakref itself is
6162 always static and therefore local. */
6163 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
)))
6165 /* Static variables are always local. */
6166 else if (! TREE_PUBLIC (exp
))
6168 /* A variable is local if the user has said explicitly that it will
6170 else if (DECL_VISIBILITY_SPECIFIED (exp
)
6171 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6173 /* Variables defined outside this object might not be local. */
6174 else if (DECL_EXTERNAL (exp
))
6176 /* If defined in this object and visibility is not default, must be
6178 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6180 /* Default visibility weak data can be overridden by a strong symbol
6181 in another module and so are not local. */
6182 else if (DECL_WEAK (exp
))
6184 /* If PIC, then assume that any global name can be overridden by
6185 symbols resolved from other modules, unless we are compiling with
6186 -fwhole-program, which assumes that names are local. */
6188 local_p
= flag_whole_program
;
6189 /* Uninitialized COMMON variable may be unified with symbols
6190 resolved from other modules. */
6191 else if (DECL_COMMON (exp
)
6192 && (DECL_INITIAL (exp
) == NULL
6193 || DECL_INITIAL (exp
) == error_mark_node
))
6195 /* Otherwise we're left with initialized (or non-common) global data
6196 which is of necessity defined locally. */
6203 /* Determine whether or not a pointer mode is valid. Assume defaults
6204 of ptr_mode or Pmode - can be overridden. */
6206 default_valid_pointer_mode (enum machine_mode mode
)
6208 return (mode
== ptr_mode
|| mode
== Pmode
);
6211 /* Default function to output code that will globalize a label. A
6212 target must define GLOBAL_ASM_OP or provide its own function to
6213 globalize a label. */
6214 #ifdef GLOBAL_ASM_OP
6216 default_globalize_label (FILE * stream
, const char *name
)
6218 fputs (GLOBAL_ASM_OP
, stream
);
6219 assemble_name (stream
, name
);
6220 putc ('\n', stream
);
6222 #endif /* GLOBAL_ASM_OP */
6224 /* Default function to output code that will globalize a declaration. */
6226 default_globalize_decl_name (FILE * stream
, tree decl
)
6228 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6229 targetm
.asm_out
.globalize_label (stream
, name
);
6232 /* Default function to output a label for unwind information. The
6233 default is to do nothing. A target that needs nonlocal labels for
6234 unwind information must provide its own function to do this. */
6236 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6237 tree decl ATTRIBUTE_UNUSED
,
6238 int for_eh ATTRIBUTE_UNUSED
,
6239 int empty ATTRIBUTE_UNUSED
)
6243 /* Default function to output a label to divide up the exception table.
6244 The default is to do nothing. A target that needs/wants to divide
6245 up the table must provide it's own function to do this. */
6247 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6251 /* This is how to output an internal numbered label where PREFIX is
6252 the class of label and LABELNO is the number within the class. */
6255 default_internal_label (FILE *stream
, const char *prefix
,
6256 unsigned long labelno
)
6258 char *const buf
= alloca (40 + strlen (prefix
));
6259 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6260 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6263 /* This is the default behavior at the beginning of a file. It's
6264 controlled by two other target-hook toggles. */
6266 default_file_start (void)
6268 if (targetm
.file_start_app_off
&& !flag_verbose_asm
)
6269 fputs (ASM_APP_OFF
, asm_out_file
);
6271 if (targetm
.file_start_file_directive
)
6272 output_file_directive (asm_out_file
, main_input_filename
);
6275 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6276 which emits a special section directive used to indicate whether or
6277 not this object file needs an executable stack. This is primarily
6278 a GNU extension to ELF but could be used on other targets. */
6280 int trampolines_created
;
6283 file_end_indicate_exec_stack (void)
6285 unsigned int flags
= SECTION_DEBUG
;
6286 if (trampolines_created
)
6287 flags
|= SECTION_CODE
;
6289 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6292 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6293 a get_unnamed_section callback. */
6296 output_section_asm_op (const void *directive
)
6298 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6301 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6302 the current section is NEW_SECTION. */
6305 switch_to_section (section
*new_section
)
6307 if (in_section
== new_section
)
6310 if (new_section
->common
.flags
& SECTION_FORGET
)
6313 in_section
= new_section
;
6315 switch (SECTION_STYLE (new_section
))
6319 && !crtl
->subsections
.unlikely_text_section_name
6320 && strcmp (new_section
->named
.name
,
6321 UNLIKELY_EXECUTED_TEXT_SECTION_NAME
) == 0)
6322 crtl
->subsections
.unlikely_text_section_name
= UNLIKELY_EXECUTED_TEXT_SECTION_NAME
;
6324 targetm
.asm_out
.named_section (new_section
->named
.name
,
6325 new_section
->named
.common
.flags
,
6326 new_section
->named
.decl
);
6329 case SECTION_UNNAMED
:
6330 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6333 case SECTION_NOSWITCH
:
6338 new_section
->common
.flags
|= SECTION_DECLARED
;
6341 /* If block symbol SYMBOL has not yet been assigned an offset, place
6342 it at the end of its block. */
6345 place_block_symbol (rtx symbol
)
6347 unsigned HOST_WIDE_INT size
, mask
, offset
;
6348 struct constant_descriptor_rtx
*desc
;
6349 unsigned int alignment
;
6350 struct object_block
*block
;
6353 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6354 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6357 /* Work out the symbol's size and alignment. */
6358 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6360 desc
= SYMBOL_REF_CONSTANT (symbol
);
6361 alignment
= desc
->align
;
6362 size
= GET_MODE_SIZE (desc
->mode
);
6364 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6366 decl
= SYMBOL_REF_DECL (symbol
);
6367 alignment
= get_constant_alignment (decl
);
6368 size
= get_constant_size (decl
);
6372 decl
= SYMBOL_REF_DECL (symbol
);
6373 alignment
= DECL_ALIGN (decl
);
6374 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6377 /* Calculate the object's offset from the start of the block. */
6378 block
= SYMBOL_REF_BLOCK (symbol
);
6379 mask
= alignment
/ BITS_PER_UNIT
- 1;
6380 offset
= (block
->size
+ mask
) & ~mask
;
6381 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6383 /* Record the block's new alignment and size. */
6384 block
->alignment
= MAX (block
->alignment
, alignment
);
6385 block
->size
= offset
+ size
;
6387 VEC_safe_push (rtx
, gc
, block
->objects
, symbol
);
6390 /* Return the anchor that should be used to address byte offset OFFSET
6391 from the first object in BLOCK. MODEL is the TLS model used
6395 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
6396 enum tls_model model
)
6399 unsigned int begin
, middle
, end
;
6400 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
6403 /* Work out the anchor's offset. Use an offset of 0 for the first
6404 anchor so that we don't pessimize the case where we take the address
6405 of a variable at the beginning of the block. This is particularly
6406 useful when a block has only one variable assigned to it.
6408 We try to place anchors RANGE bytes apart, so there can then be
6409 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6410 a ptr_mode offset. With some target settings, the lowest such
6411 anchor might be out of range for the lowest ptr_mode offset;
6412 likewise the highest anchor for the highest offset. Use anchors
6413 at the extreme ends of the ptr_mode range in such cases.
6415 All arithmetic uses unsigned integers in order to avoid
6417 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
6418 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
6419 range
= max_offset
- min_offset
+ 1;
6424 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
6427 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
6428 delta
-= delta
% range
;
6431 offset
= (HOST_WIDE_INT
) (-delta
);
6435 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
6436 delta
-= delta
% range
;
6437 if (delta
> bias
- 1)
6439 offset
= (HOST_WIDE_INT
) delta
;
6443 /* Do a binary search to see if there's already an anchor we can use.
6444 Set BEGIN to the new anchor's index if not. */
6446 end
= VEC_length (rtx
, block
->anchors
);
6447 while (begin
!= end
)
6449 middle
= (end
+ begin
) / 2;
6450 anchor
= VEC_index (rtx
, block
->anchors
, middle
);
6451 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
6453 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
6455 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
6457 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
6463 /* Create a new anchor with a unique label. */
6464 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
6465 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
6466 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
6467 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
6469 /* Insert it at index BEGIN. */
6470 VEC_safe_insert (rtx
, gc
, block
->anchors
, begin
, anchor
);
6474 /* Output the objects in BLOCK. */
6477 output_object_block (struct object_block
*block
)
6479 struct constant_descriptor_rtx
*desc
;
6481 HOST_WIDE_INT offset
;
6485 if (block
->objects
== NULL
)
6488 /* Switch to the section and make sure that the first byte is
6489 suitably aligned. */
6490 switch_to_section (block
->sect
);
6491 assemble_align (block
->alignment
);
6493 /* Define the values of all anchors relative to the current section
6495 for (i
= 0; VEC_iterate (rtx
, block
->anchors
, i
, symbol
); i
++)
6496 targetm
.asm_out
.output_anchor (symbol
);
6498 /* Output the objects themselves. */
6500 for (i
= 0; VEC_iterate (rtx
, block
->objects
, i
, symbol
); i
++)
6502 /* Move to the object's offset, padding with zeros if necessary. */
6503 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
6504 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
6505 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6507 desc
= SYMBOL_REF_CONSTANT (symbol
);
6508 output_constant_pool_1 (desc
, 1);
6509 offset
+= GET_MODE_SIZE (desc
->mode
);
6511 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6513 decl
= SYMBOL_REF_DECL (symbol
);
6514 assemble_constant_contents (decl
, XSTR (symbol
, 0),
6515 get_constant_alignment (decl
));
6516 offset
+= get_constant_size (decl
);
6520 decl
= SYMBOL_REF_DECL (symbol
);
6521 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
6522 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6527 /* A htab_traverse callback used to call output_object_block for
6528 each member of object_block_htab. */
6531 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
6533 output_object_block ((struct object_block
*) (*slot
));
6537 /* Output the definitions of all object_blocks. */
6540 output_object_blocks (void)
6542 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
6545 /* This function provides a possible implementation of the
6546 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
6547 by -frecord-gcc-switches it creates a new mergeable, string section in the
6548 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
6549 contains the switches in ASCII format.
6551 FIXME: This code does not correctly handle double quote characters
6552 that appear inside strings, (it strips them rather than preserving them).
6553 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
6554 characters - instead it treats them as sub-string separators. Since
6555 we want to emit NUL strings terminators into the object file we have to use
6559 elf_record_gcc_switches (print_switch_type type
, const char * name
)
6561 static char buffer
[1024];
6563 /* This variable is used as part of a simplistic heuristic to detect
6564 command line switches which take an argument:
6566 "If a command line option does not start with a dash then
6567 it is an argument for the previous command line option."
6569 This fails in the case of the command line option which is the name
6570 of the file to compile, but otherwise it is pretty reasonable. */
6571 static bool previous_name_held_back
= FALSE
;
6575 case SWITCH_TYPE_PASSED
:
6578 if (previous_name_held_back
)
6580 unsigned int len
= strlen (buffer
);
6582 snprintf (buffer
+ len
, sizeof buffer
- len
, " %s", name
);
6583 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6584 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6585 previous_name_held_back
= FALSE
;
6589 strncpy (buffer
, name
, sizeof buffer
);
6590 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6591 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6596 if (previous_name_held_back
)
6598 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6599 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6602 strncpy (buffer
, name
, sizeof buffer
);
6603 previous_name_held_back
= TRUE
;
6607 case SWITCH_TYPE_DESCRIPTIVE
:
6610 /* Distinguish between invocations where name is NULL. */
6611 static bool started
= false;
6615 if (previous_name_held_back
)
6617 ASM_OUTPUT_ASCII (asm_out_file
, buffer
, strlen (buffer
));
6618 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
6625 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
6629 | (SECTION_ENTSIZE
& 1),
6631 switch_to_section (sec
);
6640 /* The return value is currently ignored by the caller, but must be 0.
6641 For -fverbose-asm the return value would be the number of characters
6642 emitted into the assembler file. */
6646 /* Emit text to declare externally defined symbols. It is needed to
6647 properly support non-default visibility. */
6649 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
6651 const char *name ATTRIBUTE_UNUSED
)
6653 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
6654 set in order to avoid putting out names that are never really
6656 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
6657 && targetm
.binds_local_p (decl
))
6658 maybe_assemble_visibility (decl
);
6661 #include "gt-varasm.h"