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, 2008, 2009,
4 2010, 2011, 2012 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"
42 #include "diagnostic-core.h"
45 #include "langhooks.h"
49 #include "common/common-target.h"
50 #include "targhooks.h"
51 #include "tree-mudflap.h"
53 #include "pointer-set.h"
56 #ifdef XCOFF_DEBUGGING_INFO
57 #include "xcoffout.h" /* Needed for external data
58 declarations for e.g. AIX 4.x. */
61 /* The (assembler) name of the first globally-visible object output. */
62 extern GTY(()) const char *first_global_object_name
;
63 extern GTY(()) const char *weak_global_object_name
;
65 const char *first_global_object_name
;
66 const char *weak_global_object_name
;
69 struct constant_descriptor_rtx
;
70 struct rtx_constant_pool
;
72 #define n_deferred_constants (crtl->varasm.deferred_constants)
74 /* Number for making the label on the next
75 constant that is stored in memory. */
77 static GTY(()) int const_labelno
;
79 /* Carry information from ASM_DECLARE_OBJECT_NAME
80 to ASM_FINISH_DECLARE_OBJECT. */
82 int size_directive_output
;
84 /* The last decl for which assemble_variable was called,
85 if it did ASM_DECLARE_OBJECT_NAME.
86 If the last call to assemble_variable didn't do that,
89 tree last_assemble_variable_decl
;
91 /* The following global variable indicates if the first basic block
92 in a function belongs to the cold partition or not. */
94 bool first_function_block_is_cold
;
96 /* We give all constants their own alias set. Perhaps redundant with
97 MEM_READONLY_P, but pre-dates it. */
99 static alias_set_type const_alias_set
;
101 /* Whether we saw any functions with no_split_stack. */
103 static bool saw_no_split_stack
;
105 static const char *strip_reg_name (const char *);
106 static int contains_pointers_p (tree
);
107 #ifdef ASM_OUTPUT_EXTERNAL
108 static bool incorporeal_function_p (tree
);
110 static void decode_addr_const (tree
, struct addr_const
*);
111 static hashval_t
const_desc_hash (const void *);
112 static int const_desc_eq (const void *, const void *);
113 static hashval_t
const_hash_1 (const tree
);
114 static int compare_constant (const tree
, const tree
);
115 static tree
copy_constant (tree
);
116 static void output_constant_def_contents (rtx
);
117 static void output_addressed_constants (tree
);
118 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
119 static unsigned min_align (unsigned, unsigned);
120 static void globalize_decl (tree
);
121 static bool decl_readonly_section_1 (enum section_category
);
122 #ifdef BSS_SECTION_ASM_OP
123 #ifdef ASM_OUTPUT_ALIGNED_BSS
124 static void asm_output_aligned_bss (FILE *, tree
, const char *,
125 unsigned HOST_WIDE_INT
, int)
128 #endif /* BSS_SECTION_ASM_OP */
129 static void mark_weak (tree
);
130 static void output_constant_pool (const char *, tree
);
132 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
133 section
*text_section
;
134 section
*data_section
;
135 section
*readonly_data_section
;
136 section
*sdata_section
;
137 section
*ctors_section
;
138 section
*dtors_section
;
139 section
*bss_section
;
140 section
*sbss_section
;
142 /* Various forms of common section. All are guaranteed to be nonnull. */
143 section
*tls_comm_section
;
144 section
*comm_section
;
145 section
*lcomm_section
;
147 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
149 section
*bss_noswitch_section
;
151 /* The section that holds the main exception table, when known. The section
152 is set either by the target's init_sections hook or by the first call to
153 switch_to_exception_section. */
154 section
*exception_section
;
156 /* The section that holds the DWARF2 frame unwind information, when known.
157 The section is set either by the target's init_sections hook or by the
158 first call to switch_to_eh_frame_section. */
159 section
*eh_frame_section
;
161 /* asm_out_file's current section. This is NULL if no section has yet
162 been selected or if we lose track of what the current section is. */
165 /* True if code for the current function is currently being directed
166 at the cold section. */
167 bool in_cold_section_p
;
169 /* A linked list of all the unnamed sections. */
170 static GTY(()) section
*unnamed_sections
;
172 /* Return a nonzero value if DECL has a section attribute. */
173 #define IN_NAMED_SECTION(DECL) \
174 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
175 && DECL_SECTION_NAME (DECL) != NULL_TREE)
177 /* Hash table of named sections. */
178 static GTY((param_is (section
))) htab_t section_htab
;
180 /* A table of object_blocks, indexed by section. */
181 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
183 /* The next number to use for internal anchor labels. */
184 static GTY(()) int anchor_labelno
;
186 /* A pool of constants that can be shared between functions. */
187 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
189 /* Helper routines for maintaining section_htab. */
192 section_entry_eq (const void *p1
, const void *p2
)
194 const section
*old
= (const section
*) p1
;
195 const char *new_name
= (const char *) p2
;
197 return strcmp (old
->named
.name
, new_name
) == 0;
201 section_entry_hash (const void *p
)
203 const section
*old
= (const section
*) p
;
204 return htab_hash_string (old
->named
.name
);
207 /* Return a hash value for section SECT. */
210 hash_section (section
*sect
)
212 if (sect
->common
.flags
& SECTION_NAMED
)
213 return htab_hash_string (sect
->named
.name
);
214 return sect
->common
.flags
;
217 /* Helper routines for maintaining object_block_htab. */
220 object_block_entry_eq (const void *p1
, const void *p2
)
222 const struct object_block
*old
= (const struct object_block
*) p1
;
223 const section
*new_section
= (const section
*) p2
;
225 return old
->sect
== new_section
;
229 object_block_entry_hash (const void *p
)
231 const struct object_block
*old
= (const struct object_block
*) p
;
232 return hash_section (old
->sect
);
235 /* Return a new unnamed section with the given fields. */
238 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
243 sect
= ggc_alloc_section ();
244 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
245 sect
->unnamed
.callback
= callback
;
246 sect
->unnamed
.data
= data
;
247 sect
->unnamed
.next
= unnamed_sections
;
249 unnamed_sections
= sect
;
253 /* Return a SECTION_NOSWITCH section with the given fields. */
256 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
260 sect
= ggc_alloc_section ();
261 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
262 sect
->noswitch
.callback
= callback
;
267 /* Return the named section structure associated with NAME. Create
268 a new section with the given fields if no such structure exists. */
271 get_section (const char *name
, unsigned int flags
, tree decl
)
273 section
*sect
, **slot
;
276 htab_find_slot_with_hash (section_htab
, name
,
277 htab_hash_string (name
), INSERT
);
278 flags
|= SECTION_NAMED
;
281 sect
= ggc_alloc_section ();
282 sect
->named
.common
.flags
= flags
;
283 sect
->named
.name
= ggc_strdup (name
);
284 sect
->named
.decl
= decl
;
290 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
291 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
293 /* It is fine if one of the section flags is
294 SECTION_WRITE | SECTION_RELRO and the other has none of these
295 flags (i.e. read-only) in named sections and either the
296 section hasn't been declared yet or has been declared as writable.
297 In that case just make sure the resulting flags are
298 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
300 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
301 == (SECTION_WRITE
| SECTION_RELRO
)
302 && (sect
->common
.flags
303 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
304 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
305 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
306 || (sect
->common
.flags
& SECTION_WRITE
)))
308 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
311 /* Sanity check user variables for flag changes. */
313 decl
= sect
->named
.decl
;
315 if (sect
->named
.decl
== NULL
)
316 error ("%+D causes a section type conflict", decl
);
319 error ("%+D causes a section type conflict with %D",
320 decl
, sect
->named
.decl
);
321 if (decl
!= sect
->named
.decl
)
322 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
323 "%qD was declared here", sect
->named
.decl
);
325 /* Make sure we don't error about one section multiple times. */
326 sect
->common
.flags
|= SECTION_OVERRIDE
;
332 /* Return true if the current compilation mode benefits from having
333 objects grouped into blocks. */
336 use_object_blocks_p (void)
338 return flag_section_anchors
;
341 /* Return the object_block structure for section SECT. Create a new
342 structure if we haven't created one already. Return null if SECT
345 static struct object_block
*
346 get_block_for_section (section
*sect
)
348 struct object_block
*block
;
354 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
355 hash_section (sect
), INSERT
);
356 block
= (struct object_block
*) *slot
;
359 block
= ggc_alloc_cleared_object_block ();
366 /* Create a symbol with label LABEL and place it at byte offset
367 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
368 is not yet known. LABEL must be a garbage-collected string. */
371 create_block_symbol (const char *label
, struct object_block
*block
,
372 HOST_WIDE_INT offset
)
377 /* Create the extended SYMBOL_REF. */
378 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
379 symbol
= ggc_alloc_zone_rtx_def (size
, &rtl_zone
);
381 /* Initialize the normal SYMBOL_REF fields. */
382 memset (symbol
, 0, size
);
383 PUT_CODE (symbol
, SYMBOL_REF
);
384 PUT_MODE (symbol
, Pmode
);
385 XSTR (symbol
, 0) = label
;
386 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
388 /* Initialize the block_symbol stuff. */
389 SYMBOL_REF_BLOCK (symbol
) = block
;
390 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
395 /* Return a section with a particular name and with whatever SECTION_*
396 flags section_type_flags deems appropriate. The name of the section
397 is taken from NAME if nonnull, otherwise it is taken from DECL's
398 DECL_SECTION_NAME. DECL is the decl associated with the section
399 (see the section comment for details) and RELOC is as for
400 section_type_flags. */
403 get_named_section (tree decl
, const char *name
, int reloc
)
407 gcc_assert (!decl
|| DECL_P (decl
));
409 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
411 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
413 return get_section (name
, flags
, decl
);
416 /* If required, set DECL_SECTION_NAME to a unique name. */
419 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
420 int flag_function_or_data_sections
)
422 if (DECL_SECTION_NAME (decl
) == NULL_TREE
423 && targetm_common
.have_named_sections
424 && (flag_function_or_data_sections
425 || DECL_ONE_ONLY (decl
)))
427 targetm
.asm_out
.unique_section (decl
, reloc
);
428 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
) = true;
432 #ifdef BSS_SECTION_ASM_OP
434 #ifdef ASM_OUTPUT_ALIGNED_BSS
436 /* Utility function for targets to use in implementing
437 ASM_OUTPUT_ALIGNED_BSS.
438 ??? It is believed that this function will work in most cases so such
439 support is localized here. */
442 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
443 const char *name
, unsigned HOST_WIDE_INT size
,
446 switch_to_section (bss_section
);
447 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
448 #ifdef ASM_DECLARE_OBJECT_NAME
449 last_assemble_variable_decl
= decl
;
450 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
452 /* Standard thing is just output label for the object. */
453 ASM_OUTPUT_LABEL (file
, name
);
454 #endif /* ASM_DECLARE_OBJECT_NAME */
455 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
460 #endif /* BSS_SECTION_ASM_OP */
462 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
463 /* Return the hot section for function DECL. Return text_section for
467 hot_function_section (tree decl
)
469 if (decl
!= NULL_TREE
470 && DECL_SECTION_NAME (decl
) != NULL_TREE
471 && targetm_common
.have_named_sections
)
472 return get_named_section (decl
, NULL
, 0);
478 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
481 When DECL_SECTION_NAME is non-NULL and it is implicit section and
482 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
483 concatenate the name with NAMED_SECTION_SUFFIX.
484 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
487 get_named_text_section (tree decl
,
488 const char *text_section_name
,
489 const char *named_section_suffix
)
491 if (decl
&& DECL_SECTION_NAME (decl
))
493 if (named_section_suffix
)
495 tree dsn
= DECL_SECTION_NAME (decl
);
496 const char *stripped_name
;
499 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
500 memcpy (name
, TREE_STRING_POINTER (dsn
),
501 TREE_STRING_LENGTH (dsn
) + 1);
503 stripped_name
= targetm
.strip_name_encoding (name
);
505 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
506 return get_named_section (decl
, buffer
, 0);
508 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
512 /* Do not try to split gnu_linkonce functions. This gets somewhat
514 if (DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
)
516 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
517 name
= targetm
.strip_name_encoding (name
);
518 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
524 return get_named_section (decl
, text_section_name
, 0);
527 /* Choose named function section based on its frequency. */
530 default_function_section (tree decl
, enum node_frequency freq
,
531 bool startup
, bool exit
)
533 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
534 /* Old GNU linkers have buggy --gc-section support, which sometimes
535 results in .gcc_except_table* sections being garbage collected. */
537 && DECL_SECTION_NAME (decl
)
538 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
542 if (!flag_reorder_functions
543 || !targetm_common
.have_named_sections
)
545 /* Startup code should go to startup subsection unless it is
546 unlikely executed (this happens especially with function splitting
547 where we can split away unnecessary parts of static constructors. */
548 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
549 return get_named_text_section (decl
, ".text.startup", NULL
);
551 /* Similarly for exit. */
552 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
553 return get_named_text_section (decl
, ".text.exit", NULL
);
555 /* Group cold functions together, similarly for hot code. */
558 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
559 return get_named_text_section (decl
, ".text.unlikely", NULL
);
560 case NODE_FREQUENCY_HOT
:
561 return get_named_text_section (decl
, ".text.hot", NULL
);
567 /* Return the section for function DECL.
569 If DECL is NULL_TREE, return the text section. We can be passed
570 NULL_TREE under some circumstances by dbxout.c at least.
572 If FORCE_COLD is true, return cold function section ignoring
573 the frequency info of cgraph_node. */
576 function_section_1 (tree decl
, bool force_cold
)
578 section
*section
= NULL
;
579 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
580 bool startup
= false, exit
= false;
584 struct cgraph_node
*node
= cgraph_get_node (decl
);
588 freq
= node
->frequency
;
589 startup
= node
->only_called_at_startup
;
590 exit
= node
->only_called_at_exit
;
594 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
596 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
597 if (decl
!= NULL_TREE
598 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
600 if (targetm
.asm_out
.function_section
)
601 section
= targetm
.asm_out
.function_section (decl
, freq
,
605 return get_named_section (decl
, NULL
, 0);
608 return targetm
.asm_out
.select_section
609 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
612 if (targetm
.asm_out
.function_section
)
613 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
616 return hot_function_section (decl
);
620 /* Return the section for function DECL.
622 If DECL is NULL_TREE, return the text section. We can be passed
623 NULL_TREE under some circumstances by dbxout.c at least. */
626 function_section (tree decl
)
628 /* Handle cases where function splitting code decides
629 to put function entry point into unlikely executed section
630 despite the fact that the function itself is not cold
631 (i.e. it is called rarely but contains a hot loop that is
632 better to live in hot subsection for the code locality). */
633 return function_section_1 (decl
,
634 first_function_block_is_cold
);
637 /* Return the section for the current function, take IN_COLD_SECTION_P
641 current_function_section (void)
643 return function_section_1 (current_function_decl
, in_cold_section_p
);
646 /* Tell assembler to switch to unlikely-to-be-executed text section. */
649 unlikely_text_section (void)
651 return function_section_1 (current_function_decl
, true);
654 /* When called within a function context, return true if the function
655 has been assigned a cold text section and if SECT is that section.
656 When called outside a function context, return true if SECT is the
657 default cold section. */
660 unlikely_text_section_p (section
*sect
)
662 return sect
== function_section_1 (current_function_decl
, true);
665 /* Return the read-only data section associated with function DECL. */
668 default_function_rodata_section (tree decl
)
670 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
672 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
674 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
680 dot
= strchr (name
+ 1, '.');
683 len
= strlen (dot
) + 8;
684 rname
= (char *) alloca (len
);
686 strcpy (rname
, ".rodata");
688 return get_section (rname
, SECTION_LINKONCE
, decl
);
690 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
691 else if (DECL_ONE_ONLY (decl
)
692 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
694 size_t len
= strlen (name
) + 1;
695 char *rname
= (char *) alloca (len
);
697 memcpy (rname
, name
, len
);
699 return get_section (rname
, SECTION_LINKONCE
, decl
);
701 /* For .text.foo we want to use .rodata.foo. */
702 else if (flag_function_sections
&& flag_data_sections
703 && strncmp (name
, ".text.", 6) == 0)
705 size_t len
= strlen (name
) + 1;
706 char *rname
= (char *) alloca (len
+ 2);
708 memcpy (rname
, ".rodata", 7);
709 memcpy (rname
+ 7, name
+ 5, len
- 5);
710 return get_section (rname
, 0, decl
);
714 return readonly_data_section
;
717 /* Return the read-only data section associated with function DECL
718 for targets where that section should be always the single
719 readonly data section. */
722 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
724 return readonly_data_section
;
727 /* Return the section to use for string merging. */
730 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
731 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
732 unsigned int flags ATTRIBUTE_UNUSED
)
736 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
737 && TREE_CODE (decl
) == STRING_CST
738 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
740 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
741 && TREE_STRING_LENGTH (decl
) >= len
)
743 enum machine_mode mode
;
744 unsigned int modesize
;
748 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
749 char *name
= (char *) alloca (strlen (prefix
) + 30);
751 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
752 modesize
= GET_MODE_BITSIZE (mode
);
753 if (modesize
>= 8 && modesize
<= 256
754 && (modesize
& (modesize
- 1)) == 0)
756 if (align
< modesize
)
759 str
= TREE_STRING_POINTER (decl
);
760 unit
= GET_MODE_SIZE (mode
);
762 /* Check for embedded NUL characters. */
763 for (i
= 0; i
< len
; i
+= unit
)
765 for (j
= 0; j
< unit
; j
++)
766 if (str
[i
+ j
] != '\0')
773 sprintf (name
, "%s.str%d.%d", prefix
,
774 modesize
/ 8, (int) (align
/ 8));
775 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
776 return get_section (name
, flags
, NULL
);
781 return readonly_data_section
;
784 /* Return the section to use for constant merging. */
787 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
788 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
789 unsigned int flags ATTRIBUTE_UNUSED
)
791 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
793 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
799 && (align
& (align
- 1)) == 0)
801 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
802 char *name
= (char *) alloca (strlen (prefix
) + 30);
804 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
805 flags
|= (align
/ 8) | SECTION_MERGE
;
806 return get_section (name
, flags
, NULL
);
808 return readonly_data_section
;
811 /* Given NAME, a putative register name, discard any customary prefixes. */
814 strip_reg_name (const char *name
)
816 #ifdef REGISTER_PREFIX
817 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
818 name
+= strlen (REGISTER_PREFIX
);
820 if (name
[0] == '%' || name
[0] == '#')
825 /* The user has asked for a DECL to have a particular name. Set (or
826 change) it in such a way that we don't prefix an underscore to
829 set_user_assembler_name (tree decl
, const char *name
)
831 char *starred
= (char *) alloca (strlen (name
) + 2);
833 strcpy (starred
+ 1, name
);
834 change_decl_assembler_name (decl
, get_identifier (starred
));
835 SET_DECL_RTL (decl
, NULL_RTX
);
838 /* Decode an `asm' spec for a declaration as a register name.
839 Return the register number, or -1 if nothing specified,
840 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
841 or -3 if ASMSPEC is `cc' and is not recognized,
842 or -4 if ASMSPEC is `memory' and is not recognized.
843 Accept an exact spelling or a decimal number.
844 Prefixes such as % are optional. */
847 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
849 /* Presume just one register is clobbered. */
856 /* Get rid of confusing prefixes. */
857 asmspec
= strip_reg_name (asmspec
);
859 /* Allow a decimal number as a "register name". */
860 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
861 if (! ISDIGIT (asmspec
[i
]))
863 if (asmspec
[0] != 0 && i
< 0)
866 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
872 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
874 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
877 #ifdef OVERLAPPING_REGISTER_NAMES
881 const char *const name
;
884 } table
[] = OVERLAPPING_REGISTER_NAMES
;
886 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
888 && ! strcmp (asmspec
, table
[i
].name
))
890 *pnregs
= table
[i
].nregs
;
891 return table
[i
].number
;
894 #endif /* OVERLAPPING_REGISTER_NAMES */
896 #ifdef ADDITIONAL_REGISTER_NAMES
898 static const struct { const char *const name
; const int number
; } table
[]
899 = ADDITIONAL_REGISTER_NAMES
;
901 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
903 && ! strcmp (asmspec
, table
[i
].name
))
904 return table
[i
].number
;
906 #endif /* ADDITIONAL_REGISTER_NAMES */
908 if (!strcmp (asmspec
, "memory"))
911 if (!strcmp (asmspec
, "cc"))
921 decode_reg_name (const char *name
)
924 return decode_reg_name_and_count (name
, &count
);
928 /* Return true if DECL's initializer is suitable for a BSS section. */
931 bss_initializer_p (const_tree decl
)
933 return (DECL_INITIAL (decl
) == NULL
934 || DECL_INITIAL (decl
) == error_mark_node
935 || (flag_zero_initialized_in_bss
936 /* Leave constant zeroes in .rodata so they
938 && !TREE_READONLY (decl
)
939 && initializer_zerop (DECL_INITIAL (decl
))));
942 /* Compute the alignment of variable specified by DECL.
943 DONT_OUTPUT_DATA is from assemble_variable. */
946 align_variable (tree decl
, bool dont_output_data
)
948 unsigned int align
= DECL_ALIGN (decl
);
950 /* In the case for initialing an array whose length isn't specified,
951 where we have not yet been able to do the layout,
952 figure out the proper alignment now. */
953 if (dont_output_data
&& DECL_SIZE (decl
) == 0
954 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
955 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
957 /* Some object file formats have a maximum alignment which they support.
958 In particular, a.out format supports a maximum alignment of 4. */
959 if (align
> MAX_OFILE_ALIGNMENT
)
961 warning (0, "alignment of %q+D is greater than maximum object "
962 "file alignment. Using %d", decl
,
963 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
964 align
= MAX_OFILE_ALIGNMENT
;
967 /* On some machines, it is good to increase alignment sometimes. */
968 if (! DECL_USER_ALIGN (decl
))
970 #ifdef DATA_ALIGNMENT
971 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
972 /* Don't increase alignment too much for TLS variables - TLS space
974 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
977 #ifdef CONSTANT_ALIGNMENT
978 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
980 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
982 /* Don't increase alignment too much for TLS variables - TLS space
984 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
990 /* Reset the alignment in case we have made it tighter, so we can benefit
991 from it in get_pointer_alignment. */
992 DECL_ALIGN (decl
) = align
;
995 /* Return the section into which the given VAR_DECL or CONST_DECL
996 should be placed. PREFER_NOSWITCH_P is true if a noswitch
997 section should be used wherever possible. */
1000 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1002 addr_space_t as
= ADDR_SPACE_GENERIC
;
1005 if (TREE_TYPE (decl
) != error_mark_node
)
1006 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1008 if (DECL_COMMON (decl
))
1010 /* If the decl has been given an explicit section name, or it resides
1011 in a non-generic address space, then it isn't common, and shouldn't
1012 be handled as such. */
1013 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1014 && ADDR_SPACE_GENERIC_P (as
));
1015 if (DECL_THREAD_LOCAL_P (decl
))
1016 return tls_comm_section
;
1017 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1018 return comm_section
;
1021 if (DECL_INITIAL (decl
) == error_mark_node
)
1022 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1023 else if (DECL_INITIAL (decl
))
1024 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1028 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1029 if (IN_NAMED_SECTION (decl
))
1030 return get_named_section (decl
, NULL
, reloc
);
1032 if (ADDR_SPACE_GENERIC_P (as
)
1033 && !DECL_THREAD_LOCAL_P (decl
)
1034 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1035 && bss_initializer_p (decl
))
1037 if (!TREE_PUBLIC (decl
))
1038 return lcomm_section
;
1039 if (bss_noswitch_section
)
1040 return bss_noswitch_section
;
1043 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1046 /* Return the block into which object_block DECL should be placed. */
1048 static struct object_block
*
1049 get_block_for_decl (tree decl
)
1053 if (TREE_CODE (decl
) == VAR_DECL
)
1055 /* The object must be defined in this translation unit. */
1056 if (DECL_EXTERNAL (decl
))
1059 /* There's no point using object blocks for something that is
1060 isolated by definition. */
1061 if (DECL_ONE_ONLY (decl
))
1065 /* We can only calculate block offsets if the decl has a known
1067 if (DECL_SIZE_UNIT (decl
) == NULL
)
1069 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1072 /* Find out which section should contain DECL. We cannot put it into
1073 an object block if it requires a standalone definition. */
1074 if (TREE_CODE (decl
) == VAR_DECL
)
1075 align_variable (decl
, 0);
1076 sect
= get_variable_section (decl
, true);
1077 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1080 return get_block_for_section (sect
);
1083 /* Make sure block symbol SYMBOL is in block BLOCK. */
1086 change_symbol_block (rtx symbol
, struct object_block
*block
)
1088 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1090 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1091 SYMBOL_REF_BLOCK (symbol
) = block
;
1095 /* Return true if it is possible to put DECL in an object_block. */
1098 use_blocks_for_decl_p (tree decl
)
1100 /* Only data DECLs can be placed into object blocks. */
1101 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1104 /* Detect decls created by dw2_force_const_mem. Such decls are
1105 special because DECL_INITIAL doesn't specify the decl's true value.
1106 dw2_output_indirect_constants will instead call assemble_variable
1107 with dont_output_data set to 1 and then print the contents itself. */
1108 if (DECL_INITIAL (decl
) == decl
)
1111 /* If this decl is an alias, then we don't want to emit a
1113 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1119 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1120 have static storage duration. In other words, it should not be an
1121 automatic variable, including PARM_DECLs.
1123 There is, however, one exception: this function handles variables
1124 explicitly placed in a particular register by the user.
1126 This is never called for PARM_DECL nodes. */
1129 make_decl_rtl (tree decl
)
1131 const char *name
= 0;
1135 /* Check that we are not being given an automatic variable. */
1136 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1137 && TREE_CODE (decl
) != RESULT_DECL
);
1139 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1140 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1141 || TREE_STATIC (decl
)
1142 || TREE_PUBLIC (decl
)
1143 || DECL_EXTERNAL (decl
)
1144 || DECL_REGISTER (decl
));
1146 /* And that we were not given a type or a label. */
1147 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1148 && TREE_CODE (decl
) != LABEL_DECL
);
1150 /* For a duplicate declaration, we can be called twice on the
1151 same DECL node. Don't discard the RTL already made. */
1152 if (DECL_RTL_SET_P (decl
))
1154 /* If the old RTL had the wrong mode, fix the mode. */
1155 x
= DECL_RTL (decl
);
1156 if (GET_MODE (x
) != DECL_MODE (decl
))
1157 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1159 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1162 /* ??? Another way to do this would be to maintain a hashed
1163 table of such critters. Instead of adding stuff to a DECL
1164 to give certain attributes to it, we could use an external
1165 hash map from DECL to set of attributes. */
1167 /* Let the target reassign the RTL if it wants.
1168 This is necessary, for example, when one machine specific
1169 decl attribute overrides another. */
1170 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1172 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1173 on the new decl information. */
1175 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1176 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1177 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1179 /* Make this function static known to the mudflap runtime. */
1180 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1181 mudflap_enqueue_decl (decl
);
1186 /* If this variable belongs to the global constant pool, retrieve the
1187 pre-computed RTL or recompute it in LTO mode. */
1188 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1190 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1194 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1196 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1197 && DECL_REGISTER (decl
))
1199 error ("register name not specified for %q+D", decl
);
1201 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1203 const char *asmspec
= name
+1;
1204 enum machine_mode mode
= DECL_MODE (decl
);
1205 reg_number
= decode_reg_name (asmspec
);
1206 /* First detect errors in declaring global registers. */
1207 if (reg_number
== -1)
1208 error ("register name not specified for %q+D", decl
);
1209 else if (reg_number
< 0)
1210 error ("invalid register name for %q+D", decl
);
1211 else if (mode
== BLKmode
)
1212 error ("data type of %q+D isn%'t suitable for a register",
1214 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1215 error ("the register specified for %q+D cannot be accessed"
1216 " by the current target", decl
);
1217 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1218 error ("the register specified for %q+D is not general enough"
1219 " to be used as a register variable", decl
);
1220 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1221 error ("register specified for %q+D isn%'t suitable for data type",
1223 /* Now handle properly declared static register variables. */
1228 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1230 DECL_INITIAL (decl
) = 0;
1231 error ("global register variable has initial value");
1233 if (TREE_THIS_VOLATILE (decl
))
1234 warning (OPT_Wvolatile_register_var
,
1235 "optimization may eliminate reads and/or "
1236 "writes to register variables");
1238 /* If the user specified one of the eliminables registers here,
1239 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1240 confused with that register and be eliminated. This usage is
1241 somewhat suspect... */
1243 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1244 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1245 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1247 if (TREE_STATIC (decl
))
1249 /* Make this register global, so not usable for anything
1251 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1252 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1253 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1255 nregs
= hard_regno_nregs
[reg_number
][mode
];
1257 globalize_reg (decl
, reg_number
+ --nregs
);
1260 /* As a register variable, it has no section. */
1264 /* Now handle ordinary static variables and functions (in memory).
1265 Also handle vars declared register invalidly. */
1266 else if (name
[0] == '*')
1268 #ifdef REGISTER_PREFIX
1269 if (strlen (REGISTER_PREFIX
) != 0)
1271 reg_number
= decode_reg_name (name
);
1272 if (reg_number
>= 0 || reg_number
== -3)
1273 error ("register name given for non-register variable %q+D", decl
);
1278 /* Specifying a section attribute on a variable forces it into a
1279 non-.bss section, and thus it cannot be common. */
1280 /* FIXME: In general this code should not be necessary because
1281 visibility pass is doing the same work. But notice_global_symbol
1282 is called early and it needs to make DECL_RTL to get the name.
1283 we take care of recomputing the DECL_RTL after visibility is changed. */
1284 if (TREE_CODE (decl
) == VAR_DECL
1285 && DECL_SECTION_NAME (decl
) != NULL_TREE
1286 && DECL_INITIAL (decl
) == NULL_TREE
1287 && DECL_COMMON (decl
))
1288 DECL_COMMON (decl
) = 0;
1290 /* Variables can't be both common and weak. */
1291 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1292 DECL_COMMON (decl
) = 0;
1294 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1295 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1298 enum machine_mode address_mode
= Pmode
;
1299 if (TREE_TYPE (decl
) != error_mark_node
)
1301 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1302 address_mode
= targetm
.addr_space
.address_mode (as
);
1304 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1306 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1307 SET_SYMBOL_REF_DECL (x
, decl
);
1309 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1310 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1311 set_mem_attributes (x
, decl
, 1);
1312 SET_DECL_RTL (decl
, x
);
1314 /* Optionally set flags or add text to the name to record information
1315 such as that it is a function name.
1316 If the name is changed, the macro ASM_OUTPUT_LABELREF
1317 will have to know how to strip this information. */
1318 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1320 /* Make this function static known to the mudflap runtime. */
1321 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1322 mudflap_enqueue_decl (decl
);
1325 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1326 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1330 make_decl_rtl_for_debug (tree decl
)
1332 unsigned int save_aliasing_flag
, save_mudflap_flag
;
1335 if (DECL_RTL_SET_P (decl
))
1336 return DECL_RTL (decl
);
1338 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1339 call new_alias_set. If running with -fcompare-debug, sometimes
1340 we do not want to create alias sets that will throw the alias
1341 numbers off in the comparison dumps. So... clearing
1342 flag_strict_aliasing will keep new_alias_set() from creating a
1343 new set. It is undesirable to register decl with mudflap
1344 in this case as well. */
1345 save_aliasing_flag
= flag_strict_aliasing
;
1346 flag_strict_aliasing
= 0;
1347 save_mudflap_flag
= flag_mudflap
;
1350 rtl
= DECL_RTL (decl
);
1351 /* Reset DECL_RTL back, as various parts of the compiler expects
1352 DECL_RTL set meaning it is actually going to be output. */
1353 SET_DECL_RTL (decl
, NULL
);
1355 flag_strict_aliasing
= save_aliasing_flag
;
1356 flag_mudflap
= save_mudflap_flag
;
1361 /* Output a string of literal assembler code
1362 for an `asm' keyword used between functions. */
1365 assemble_asm (tree string
)
1370 if (TREE_CODE (string
) == ADDR_EXPR
)
1371 string
= TREE_OPERAND (string
, 0);
1373 p
= TREE_STRING_POINTER (string
);
1374 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1377 /* Write the address of the entity given by SYMBOL to SEC. */
1379 assemble_addr_to_section (rtx symbol
, section
*sec
)
1381 switch_to_section (sec
);
1382 assemble_align (POINTER_SIZE
);
1383 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1386 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1387 not) section for PRIORITY. */
1389 get_cdtor_priority_section (int priority
, bool constructor_p
)
1393 /* ??? This only works reliably with the GNU linker. */
1394 sprintf (buf
, "%s.%.5u",
1395 constructor_p
? ".ctors" : ".dtors",
1396 /* Invert the numbering so the linker puts us in the proper
1397 order; constructors are run from right to left, and the
1398 linker sorts in increasing order. */
1399 MAX_INIT_PRIORITY
- priority
);
1400 return get_section (buf
, SECTION_WRITE
, NULL
);
1404 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1408 if (priority
!= DEFAULT_INIT_PRIORITY
)
1409 sec
= get_cdtor_priority_section (priority
,
1410 /*constructor_p=*/false);
1412 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1414 assemble_addr_to_section (symbol
, sec
);
1417 #ifdef DTORS_SECTION_ASM_OP
1419 default_dtor_section_asm_out_destructor (rtx symbol
,
1420 int priority ATTRIBUTE_UNUSED
)
1422 assemble_addr_to_section (symbol
, dtors_section
);
1427 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1431 if (priority
!= DEFAULT_INIT_PRIORITY
)
1432 sec
= get_cdtor_priority_section (priority
,
1433 /*constructor_p=*/true);
1435 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1437 assemble_addr_to_section (symbol
, sec
);
1440 #ifdef CTORS_SECTION_ASM_OP
1442 default_ctor_section_asm_out_constructor (rtx symbol
,
1443 int priority ATTRIBUTE_UNUSED
)
1445 assemble_addr_to_section (symbol
, ctors_section
);
1449 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1450 a nonzero value if the constant pool should be output before the
1451 start of the function, or a zero value if the pool should output
1452 after the end of the function. The default is to put it before the
1455 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1456 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1459 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1460 to be output to assembler.
1461 Set first_global_object_name and weak_global_object_name as appropriate. */
1464 notice_global_symbol (tree decl
)
1466 const char **type
= &first_global_object_name
;
1468 if (first_global_object_name
1469 || !TREE_PUBLIC (decl
)
1470 || DECL_EXTERNAL (decl
)
1471 || !DECL_NAME (decl
)
1472 || (TREE_CODE (decl
) != FUNCTION_DECL
1473 && (TREE_CODE (decl
) != VAR_DECL
1474 || (DECL_COMMON (decl
)
1475 && (DECL_INITIAL (decl
) == 0
1476 || DECL_INITIAL (decl
) == error_mark_node
))))
1477 || !MEM_P (DECL_RTL (decl
)))
1480 /* We win when global object is found, but it is useful to know about weak
1481 symbol as well so we can produce nicer unique names. */
1482 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1483 type
= &weak_global_object_name
;
1489 rtx decl_rtl
= DECL_RTL (decl
);
1491 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1492 name
= ggc_strdup (p
);
1498 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1499 current function goes into the cold section, so that targets can use
1500 current_function_section during RTL expansion. DECL describes the
1504 decide_function_section (tree decl
)
1506 first_function_block_is_cold
= false;
1508 if (flag_reorder_blocks_and_partition
)
1509 /* We will decide in assemble_start_function. */
1512 if (DECL_SECTION_NAME (decl
))
1514 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1515 /* Calls to function_section rely on first_function_block_is_cold
1517 first_function_block_is_cold
= (node
1519 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1522 in_cold_section_p
= first_function_block_is_cold
;
1525 /* Output assembler code for the constant pool of a function and associated
1526 with defining the name of the function. DECL describes the function.
1527 NAME is the function's name. For the constant pool, we use the current
1528 constant pool data. */
1531 assemble_start_function (tree decl
, const char *fnname
)
1534 char tmp_label
[100];
1535 bool hot_label_written
= false;
1537 if (flag_reorder_blocks_and_partition
)
1539 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1540 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1541 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1542 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1543 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1544 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1545 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1546 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1551 crtl
->subsections
.hot_section_label
= NULL
;
1552 crtl
->subsections
.cold_section_label
= NULL
;
1553 crtl
->subsections
.hot_section_end_label
= NULL
;
1554 crtl
->subsections
.cold_section_end_label
= NULL
;
1557 /* The following code does not need preprocessing in the assembler. */
1561 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1562 output_constant_pool (fnname
, decl
);
1564 /* Make sure the not and cold text (code) sections are properly
1565 aligned. This is necessary here in the case where the function
1566 has both hot and cold sections, because we don't want to re-set
1567 the alignment when the section switch happens mid-function. */
1569 if (flag_reorder_blocks_and_partition
)
1571 first_function_block_is_cold
= false;
1573 switch_to_section (unlikely_text_section ());
1574 assemble_align (DECL_ALIGN (decl
));
1575 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1577 /* When the function starts with a cold section, we need to explicitly
1578 align the hot section and write out the hot section label.
1579 But if the current function is a thunk, we do not have a CFG. */
1581 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1583 switch_to_section (text_section
);
1584 assemble_align (DECL_ALIGN (decl
));
1585 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1586 hot_label_written
= true;
1587 first_function_block_is_cold
= true;
1589 in_cold_section_p
= first_function_block_is_cold
;
1593 /* Switch to the correct text section for the start of the function. */
1595 switch_to_section (function_section (decl
));
1596 if (flag_reorder_blocks_and_partition
1597 && !hot_label_written
)
1598 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1600 /* Tell assembler to move to target machine's alignment for functions. */
1601 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1604 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1607 /* Handle a user-specified function alignment.
1608 Note that we still need to align to DECL_ALIGN, as above,
1609 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1610 if (! DECL_USER_ALIGN (decl
)
1611 && align_functions_log
> align
1612 && optimize_function_for_speed_p (cfun
))
1614 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1615 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1616 align_functions_log
, align_functions
- 1);
1618 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1622 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1623 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1626 if (!DECL_IGNORED_P (decl
))
1627 (*debug_hooks
->begin_function
) (decl
);
1629 /* Make function name accessible from other files, if appropriate. */
1631 if (TREE_PUBLIC (decl
))
1633 notice_global_symbol (decl
);
1635 globalize_decl (decl
);
1637 maybe_assemble_visibility (decl
);
1640 if (DECL_PRESERVE_P (decl
))
1641 targetm
.asm_out
.mark_decl_preserved (fnname
);
1643 /* Do any machine/system dependent processing of the function name. */
1644 #ifdef ASM_DECLARE_FUNCTION_NAME
1645 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1647 /* Standard thing is just output label for the function. */
1648 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1649 #endif /* ASM_DECLARE_FUNCTION_NAME */
1651 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1652 saw_no_split_stack
= true;
1655 /* Output assembler code associated with defining the size of the
1656 function. DECL describes the function. NAME is the function's name. */
1659 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1661 #ifdef ASM_DECLARE_FUNCTION_SIZE
1662 /* We could have switched section in the middle of the function. */
1663 if (flag_reorder_blocks_and_partition
)
1664 switch_to_section (function_section (decl
));
1665 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1667 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1669 output_constant_pool (fnname
, decl
);
1670 switch_to_section (function_section (decl
)); /* need to switch back */
1672 /* Output labels for end of hot/cold text sections (to be used by
1674 if (flag_reorder_blocks_and_partition
)
1676 section
*save_text_section
;
1678 save_text_section
= in_section
;
1679 switch_to_section (unlikely_text_section ());
1680 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1681 if (first_function_block_is_cold
)
1682 switch_to_section (text_section
);
1684 switch_to_section (function_section (decl
));
1685 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1686 switch_to_section (save_text_section
);
1690 /* Assemble code to leave SIZE bytes of zeros. */
1693 assemble_zeros (unsigned HOST_WIDE_INT size
)
1695 /* Do no output if -fsyntax-only. */
1696 if (flag_syntax_only
)
1699 #ifdef ASM_NO_SKIP_IN_TEXT
1700 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1701 so we must output 0s explicitly in the text section. */
1702 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1704 unsigned HOST_WIDE_INT i
;
1705 for (i
= 0; i
< size
; i
++)
1706 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1711 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1714 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1717 assemble_align (int align
)
1719 if (align
> BITS_PER_UNIT
)
1721 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1725 /* Assemble a string constant with the specified C string as contents. */
1728 assemble_string (const char *p
, int size
)
1733 /* If the string is very long, split it up. */
1737 int thissize
= size
- pos
;
1738 if (thissize
> maximum
)
1741 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1749 /* A noswitch_section_callback for lcomm_section. */
1752 emit_local (tree decl ATTRIBUTE_UNUSED
,
1753 const char *name ATTRIBUTE_UNUSED
,
1754 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1755 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1757 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1758 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1759 size
, DECL_ALIGN (decl
));
1761 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1762 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1765 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1770 /* A noswitch_section_callback for bss_noswitch_section. */
1772 #if defined ASM_OUTPUT_ALIGNED_BSS
1774 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1775 const char *name ATTRIBUTE_UNUSED
,
1776 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1777 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1779 #if defined ASM_OUTPUT_ALIGNED_BSS
1780 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1786 /* A noswitch_section_callback for comm_section. */
1789 emit_common (tree decl ATTRIBUTE_UNUSED
,
1790 const char *name ATTRIBUTE_UNUSED
,
1791 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1792 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1794 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1795 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1796 size
, DECL_ALIGN (decl
));
1798 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1799 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1802 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1807 /* A noswitch_section_callback for tls_comm_section. */
1810 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1811 const char *name ATTRIBUTE_UNUSED
,
1812 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1813 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1815 #ifdef ASM_OUTPUT_TLS_COMMON
1816 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1819 sorry ("thread-local COMMON data not implemented");
1824 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1825 NAME is the name of DECL's SYMBOL_REF. */
1828 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1830 unsigned HOST_WIDE_INT size
, rounded
;
1832 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1835 if (flag_asan
&& asan_protect_global (decl
))
1836 size
+= asan_red_zone_size (size
);
1838 /* Don't allocate zero bytes of common,
1839 since that means "undefined external" in the linker. */
1843 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1844 so that each uninitialized object starts on such a boundary. */
1845 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1846 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1847 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1849 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1850 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1851 warning (0, "requested alignment for %q+D is greater than "
1852 "implemented alignment of %wu", decl
, rounded
);
1855 /* A subroutine of assemble_variable. Output the label and contents of
1856 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1857 is as for assemble_variable. */
1860 assemble_variable_contents (tree decl
, const char *name
,
1861 bool dont_output_data
)
1863 /* Do any machine/system dependent processing of the object. */
1864 #ifdef ASM_DECLARE_OBJECT_NAME
1865 last_assemble_variable_decl
= decl
;
1866 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1868 /* Standard thing is just output label for the object. */
1869 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1870 #endif /* ASM_DECLARE_OBJECT_NAME */
1872 if (!dont_output_data
)
1874 if (DECL_INITIAL (decl
)
1875 && DECL_INITIAL (decl
) != error_mark_node
1876 && !initializer_zerop (DECL_INITIAL (decl
)))
1877 /* Output the actual data. */
1878 output_constant (DECL_INITIAL (decl
),
1879 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1882 /* Leave space for it. */
1883 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1887 /* Assemble everything that is needed for a variable or function declaration.
1888 Not used for automatic variables, and not used for function definitions.
1889 Should not be called for variables of incomplete structure type.
1891 TOP_LEVEL is nonzero if this variable has file scope.
1892 AT_END is nonzero if this is the special handling, at end of compilation,
1893 to define things that have had only tentative definitions.
1894 DONT_OUTPUT_DATA if nonzero means don't actually output the
1895 initial value (that will be done by the caller). */
1898 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1899 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1902 rtx decl_rtl
, symbol
;
1904 bool asan_protected
= false;
1906 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1907 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1909 /* Emulated TLS had better not get this far. */
1910 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1912 last_assemble_variable_decl
= 0;
1914 /* Normally no need to say anything here for external references,
1915 since assemble_external is called by the language-specific code
1916 when a declaration is first seen. */
1918 if (DECL_EXTERNAL (decl
))
1921 /* Do nothing for global register variables. */
1922 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1924 TREE_ASM_WRITTEN (decl
) = 1;
1928 /* If type was incomplete when the variable was declared,
1929 see if it is complete now. */
1931 if (DECL_SIZE (decl
) == 0)
1932 layout_decl (decl
, 0);
1934 /* Still incomplete => don't allocate it; treat the tentative defn
1935 (which is what it must have been) as an `extern' reference. */
1937 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
1939 error ("storage size of %q+D isn%'t known", decl
);
1940 TREE_ASM_WRITTEN (decl
) = 1;
1944 /* The first declaration of a variable that comes through this function
1945 decides whether it is global (in C, has external linkage)
1946 or local (in C, has internal linkage). So do nothing more
1947 if this function has already run. */
1949 if (TREE_ASM_WRITTEN (decl
))
1952 /* Make sure targetm.encode_section_info is invoked before we set
1954 decl_rtl
= DECL_RTL (decl
);
1956 TREE_ASM_WRITTEN (decl
) = 1;
1958 /* Do no output if -fsyntax-only. */
1959 if (flag_syntax_only
)
1962 if (! dont_output_data
1963 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
1965 error ("size of variable %q+D is too large", decl
);
1969 gcc_assert (MEM_P (decl_rtl
));
1970 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
1971 symbol
= XEXP (decl_rtl
, 0);
1973 /* If this symbol belongs to the tree constant pool, output the constant
1974 if it hasn't already been written. */
1975 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
1977 tree decl
= SYMBOL_REF_DECL (symbol
);
1978 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
1979 output_constant_def_contents (symbol
);
1985 name
= XSTR (symbol
, 0);
1986 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
1987 notice_global_symbol (decl
);
1989 /* Compute the alignment of this data. */
1991 align_variable (decl
, dont_output_data
);
1994 && asan_protect_global (decl
))
1996 asan_protected
= true;
1997 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
1998 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2001 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2003 if (TREE_PUBLIC (decl
))
2004 maybe_assemble_visibility (decl
);
2006 if (DECL_PRESERVE_P (decl
))
2007 targetm
.asm_out
.mark_decl_preserved (name
);
2009 /* First make the assembler name(s) global if appropriate. */
2010 sect
= get_variable_section (decl
, false);
2011 if (TREE_PUBLIC (decl
)
2012 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2013 globalize_decl (decl
);
2015 /* Output any data that we will need to use the address of. */
2016 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2017 output_addressed_constants (DECL_INITIAL (decl
));
2019 /* dbxout.c needs to know this. */
2020 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2021 DECL_IN_TEXT_SECTION (decl
) = 1;
2023 /* If the decl is part of an object_block, make sure that the decl
2024 has been positioned within its block, but do not write out its
2025 definition yet. output_object_blocks will do that later. */
2026 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2028 gcc_assert (!dont_output_data
);
2029 place_block_symbol (symbol
);
2031 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2032 assemble_noswitch_variable (decl
, name
, sect
);
2035 switch_to_section (sect
);
2036 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2037 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2038 assemble_variable_contents (decl
, name
, dont_output_data
);
2041 unsigned HOST_WIDE_INT
int size
2042 = tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
2043 assemble_zeros (asan_red_zone_size (size
));
2048 /* Return 1 if type TYPE contains any pointers. */
2051 contains_pointers_p (tree type
)
2053 switch (TREE_CODE (type
))
2056 case REFERENCE_TYPE
:
2057 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2058 so I'll play safe and return 1. */
2064 case QUAL_UNION_TYPE
:
2067 /* For a type that has fields, see if the fields have pointers. */
2068 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2069 if (TREE_CODE (fields
) == FIELD_DECL
2070 && contains_pointers_p (TREE_TYPE (fields
)))
2076 /* An array type contains pointers if its element type does. */
2077 return contains_pointers_p (TREE_TYPE (type
));
2084 /* We delay assemble_external processing until
2085 the compilation unit is finalized. This is the best we can do for
2086 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2087 it all the way to final. See PR 17982 for further discussion. */
2088 static GTY(()) tree pending_assemble_externals
;
2090 #ifdef ASM_OUTPUT_EXTERNAL
2091 /* True if DECL is a function decl for which no out-of-line copy exists.
2092 It is assumed that DECL's assembler name has been set. */
2095 incorporeal_function_p (tree decl
)
2097 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2101 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2102 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2103 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2106 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2107 /* Atomic or sync builtins which have survived this far will be
2108 resolved externally and therefore are not incorporeal. */
2109 if (strncmp (name
, "__builtin_", 10) == 0)
2115 /* Actually do the tests to determine if this is necessary, and invoke
2116 ASM_OUTPUT_EXTERNAL. */
2118 assemble_external_real (tree decl
)
2120 rtx rtl
= DECL_RTL (decl
);
2122 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2123 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2124 && !incorporeal_function_p (decl
))
2126 /* Some systems do require some output. */
2127 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2128 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2134 process_pending_assemble_externals (void)
2136 #ifdef ASM_OUTPUT_EXTERNAL
2138 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2139 assemble_external_real (TREE_VALUE (list
));
2141 pending_assemble_externals
= 0;
2145 /* This TREE_LIST contains any weak symbol declarations waiting
2147 static GTY(()) tree weak_decls
;
2149 /* Output something to declare an external symbol to the assembler,
2150 and qualifiers such as weakness. (Most assemblers don't need
2151 extern declaration, so we normally output nothing.) Do nothing if
2152 DECL is not external. */
2155 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2157 /* Make sure that the ASM_OUT_FILE is open.
2158 If it's not, we should not be calling this function. */
2159 gcc_assert (asm_out_file
);
2161 /* In a perfect world, the following condition would be true.
2162 Sadly, the Java and Go front ends emit assembly *from the front end*,
2163 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2165 /* This function should only be called if we are expanding, or have
2167 Ideally, only final.c would be calling this function, but it is
2168 not clear whether that would break things somehow. See PR 17982
2169 for further discussion. */
2170 gcc_assert (cgraph_state
== CGRAPH_STATE_EXPANSION
2171 || cgraph_state
== CGRAPH_STATE_FINISHED
);
2174 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2177 /* We want to output annotation for weak and external symbols at
2178 very last to check if they are references or not. */
2180 if (TARGET_SUPPORTS_WEAK
2182 /* TREE_STATIC is a weird and abused creature which is not
2183 generally the right test for whether an entity has been
2184 locally emitted, inlined or otherwise not-really-extern, but
2185 for declarations that can be weak, it happens to be
2187 && !TREE_STATIC (decl
)
2188 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2189 && value_member (decl
, weak_decls
) == NULL_TREE
)
2190 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2192 #ifdef ASM_OUTPUT_EXTERNAL
2193 if (value_member (decl
, pending_assemble_externals
) == NULL_TREE
)
2194 pending_assemble_externals
= tree_cons (NULL
, decl
,
2195 pending_assemble_externals
);
2199 /* Similar, for calling a library function FUN. */
2202 assemble_external_libcall (rtx fun
)
2204 /* Declare library function name external when first used, if nec. */
2205 if (! SYMBOL_REF_USED (fun
))
2207 SYMBOL_REF_USED (fun
) = 1;
2208 targetm
.asm_out
.external_libcall (fun
);
2212 /* Assemble a label named NAME. */
2215 assemble_label (FILE *file
, const char *name
)
2217 ASM_OUTPUT_LABEL (file
, name
);
2220 /* Set the symbol_referenced flag for ID. */
2222 mark_referenced (tree id
)
2224 TREE_SYMBOL_REFERENCED (id
) = 1;
2227 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2229 mark_decl_referenced (tree decl
)
2231 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2233 /* Extern inline functions don't become needed when referenced.
2234 If we know a method will be emitted in other TU and no new
2235 functions can be marked reachable, just use the external
2237 struct cgraph_node
*node
= cgraph_get_create_node (decl
);
2238 if (!DECL_EXTERNAL (decl
)
2239 && !node
->local
.finalized
)
2240 cgraph_mark_force_output_node (node
);
2242 else if (TREE_CODE (decl
) == VAR_DECL
)
2244 struct varpool_node
*node
= varpool_node_for_decl (decl
);
2245 /* C++ frontend use mark_decl_references to force COMDAT variables
2246 to be output that might appear dead otherwise. */
2247 node
->symbol
.force_output
= true;
2249 /* else do nothing - we can get various sorts of CST nodes here,
2250 which do not need to be marked. */
2254 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2255 until we find an identifier that is not itself a transparent alias.
2256 Modify the alias passed to it by reference (and all aliases on the
2257 way to the ultimate target), such that they do not have to be
2258 followed again, and return the ultimate target of the alias
2262 ultimate_transparent_alias_target (tree
*alias
)
2264 tree target
= *alias
;
2266 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2268 gcc_assert (TREE_CHAIN (target
));
2269 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2270 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2271 && ! TREE_CHAIN (target
));
2278 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2279 starts with a *, the rest of NAME is output verbatim. Otherwise
2280 NAME is transformed in a target-specific way (usually by the
2281 addition of an underscore). */
2284 assemble_name_raw (FILE *file
, const char *name
)
2287 fputs (&name
[1], file
);
2289 ASM_OUTPUT_LABELREF (file
, name
);
2292 /* Like assemble_name_raw, but should be used when NAME might refer to
2293 an entity that is also represented as a tree (like a function or
2294 variable). If NAME does refer to such an entity, that entity will
2295 be marked as referenced. */
2298 assemble_name (FILE *file
, const char *name
)
2300 const char *real_name
;
2303 real_name
= targetm
.strip_name_encoding (name
);
2305 id
= maybe_get_identifier (real_name
);
2310 mark_referenced (id
);
2311 ultimate_transparent_alias_target (&id
);
2313 name
= IDENTIFIER_POINTER (id
);
2314 gcc_assert (! TREE_CHAIN (id
));
2317 assemble_name_raw (file
, name
);
2320 /* Allocate SIZE bytes writable static space with a gensym name
2321 and return an RTX to refer to its address. */
2324 assemble_static_space (unsigned HOST_WIDE_INT size
)
2327 const char *namestring
;
2330 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2332 namestring
= ggc_strdup (name
);
2334 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2335 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2337 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2338 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2341 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2342 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2345 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2346 so that each uninitialized object starts on such a boundary. */
2347 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2348 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2349 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2350 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2351 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2352 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2359 /* Assemble the static constant template for function entry trampolines.
2360 This is done at most once per compilation.
2361 Returns an RTX for the address of the template. */
2363 static GTY(()) rtx initial_trampoline
;
2366 assemble_trampoline_template (void)
2373 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2375 if (initial_trampoline
)
2376 return initial_trampoline
;
2378 /* By default, put trampoline templates in read-only data section. */
2380 #ifdef TRAMPOLINE_SECTION
2381 switch_to_section (TRAMPOLINE_SECTION
);
2383 switch_to_section (readonly_data_section
);
2386 /* Write the assembler code to define one. */
2387 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2389 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2391 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2392 targetm
.asm_out
.trampoline_template (asm_out_file
);
2394 /* Record the rtl to refer to it. */
2395 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2396 name
= ggc_strdup (label
);
2397 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2398 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2400 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2401 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2402 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2404 return initial_trampoline
;
2407 /* A and B are either alignments or offsets. Return the minimum alignment
2408 that may be assumed after adding the two together. */
2410 static inline unsigned
2411 min_align (unsigned int a
, unsigned int b
)
2413 return (a
| b
) & -(a
| b
);
2416 /* Return the assembler directive for creating a given kind of integer
2417 object. SIZE is the number of bytes in the object and ALIGNED_P
2418 indicates whether it is known to be aligned. Return NULL if the
2419 assembly dialect has no such directive.
2421 The returned string should be printed at the start of a new line and
2422 be followed immediately by the object's initial value. */
2425 integer_asm_op (int size
, int aligned_p
)
2427 struct asm_int_op
*ops
;
2430 ops
= &targetm
.asm_out
.aligned_op
;
2432 ops
= &targetm
.asm_out
.unaligned_op
;
2437 return targetm
.asm_out
.byte_op
;
2451 /* Use directive OP to assemble an integer object X. Print OP at the
2452 start of the line, followed immediately by the value of X. */
2455 assemble_integer_with_op (const char *op
, rtx x
)
2457 fputs (op
, asm_out_file
);
2458 output_addr_const (asm_out_file
, x
);
2459 fputc ('\n', asm_out_file
);
2462 /* The default implementation of the asm_out.integer target hook. */
2465 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2466 unsigned int size ATTRIBUTE_UNUSED
,
2467 int aligned_p ATTRIBUTE_UNUSED
)
2469 const char *op
= integer_asm_op (size
, aligned_p
);
2470 /* Avoid GAS bugs for large values. Specifically negative values whose
2471 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2472 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2474 return op
&& (assemble_integer_with_op (op
, x
), true);
2477 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2478 the alignment of the integer in bits. Return 1 if we were able to output
2479 the constant, otherwise 0. We must be able to output the constant,
2480 if FORCE is nonzero. */
2483 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2487 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2489 /* See if the target hook can handle this kind of object. */
2490 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2493 /* If the object is a multi-byte one, try splitting it up. Split
2494 it into words it if is multi-word, otherwise split it into bytes. */
2497 enum machine_mode omode
, imode
;
2498 unsigned int subalign
;
2499 unsigned int subsize
, i
;
2500 enum mode_class mclass
;
2502 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2503 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2504 if (GET_CODE (x
) == CONST_FIXED
)
2505 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2509 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2510 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2512 for (i
= 0; i
< size
; i
+= subsize
)
2514 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2515 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2521 /* If we've printed some of it, but not all of it, there's no going
2526 gcc_assert (!force
);
2532 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2534 long data
[4] = {0, 0, 0, 0};
2536 int bitsize
, nelts
, nunits
, units_per
;
2538 /* This is hairy. We have a quantity of known size. real_to_target
2539 will put it into an array of *host* longs, 32 bits per element
2540 (even if long is more than 32 bits). We need to determine the
2541 number of array elements that are occupied (nelts) and the number
2542 of *target* min-addressable units that will be occupied in the
2543 object file (nunits). We cannot assume that 32 divides the
2544 mode's bitsize (size * BITS_PER_UNIT) evenly.
2546 size * BITS_PER_UNIT is used here to make sure that padding bits
2547 (which might appear at either end of the value; real_to_target
2548 will include the padding bits in its output array) are included. */
2550 nunits
= GET_MODE_SIZE (mode
);
2551 bitsize
= nunits
* BITS_PER_UNIT
;
2552 nelts
= CEIL (bitsize
, 32);
2553 units_per
= 32 / BITS_PER_UNIT
;
2555 real_to_target (data
, &d
, mode
);
2557 /* Put out the first word with the specified alignment. */
2558 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2559 nunits
-= units_per
;
2561 /* Subsequent words need only 32-bit alignment. */
2562 align
= min_align (align
, 32);
2564 for (i
= 1; i
< nelts
; i
++)
2566 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2567 nunits
-= units_per
;
2571 /* Given an expression EXP with a constant value,
2572 reduce it to the sum of an assembler symbol and an integer.
2573 Store them both in the structure *VALUE.
2574 EXP must be reducible. */
2578 HOST_WIDE_INT offset
;
2582 decode_addr_const (tree exp
, struct addr_const
*value
)
2584 tree target
= TREE_OPERAND (exp
, 0);
2590 if (TREE_CODE (target
) == COMPONENT_REF
2591 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2593 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2594 target
= TREE_OPERAND (target
, 0);
2596 else if (TREE_CODE (target
) == ARRAY_REF
2597 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2599 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2600 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2601 target
= TREE_OPERAND (target
, 0);
2603 else if (TREE_CODE (target
) == MEM_REF
2604 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2606 offset
+= mem_ref_offset (target
).low
;
2607 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2609 else if (TREE_CODE (target
) == INDIRECT_REF
2610 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2611 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2613 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2618 switch (TREE_CODE (target
))
2622 x
= DECL_RTL (target
);
2626 x
= gen_rtx_MEM (FUNCTION_MODE
,
2627 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2636 x
= output_constant_def (target
, 1);
2643 gcc_assert (MEM_P (x
));
2647 value
->offset
= offset
;
2651 static GTY((param_is (struct constant_descriptor_tree
)))
2652 htab_t const_desc_htab
;
2654 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2656 /* Constant pool accessor function. */
2659 constant_pool_htab (void)
2661 return const_desc_htab
;
2664 /* Compute a hash code for a constant expression. */
2667 const_desc_hash (const void *ptr
)
2669 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2673 const_hash_1 (const tree exp
)
2678 enum tree_code code
= TREE_CODE (exp
);
2680 /* Either set P and LEN to the address and len of something to hash and
2681 exit the switch or return a value. */
2686 p
= (char *) &TREE_INT_CST (exp
);
2687 len
= sizeof TREE_INT_CST (exp
);
2691 return real_hash (TREE_REAL_CST_PTR (exp
));
2694 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2697 p
= TREE_STRING_POINTER (exp
);
2698 len
= TREE_STRING_LENGTH (exp
);
2702 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2703 + const_hash_1 (TREE_IMAGPART (exp
)));
2709 hi
= 7 + VECTOR_CST_NELTS (exp
);
2711 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2712 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2719 unsigned HOST_WIDE_INT idx
;
2722 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2724 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2726 hi
= hi
* 603 + const_hash_1 (value
);
2734 struct addr_const value
;
2736 decode_addr_const (exp
, &value
);
2737 switch (GET_CODE (value
.base
))
2740 /* Don't hash the address of the SYMBOL_REF;
2741 only use the offset and the symbol name. */
2743 p
= XSTR (value
.base
, 0);
2744 for (i
= 0; p
[i
] != 0; i
++)
2745 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2749 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2759 case POINTER_PLUS_EXPR
:
2761 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2762 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2765 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2768 /* A language specific constant. Just hash the code. */
2772 /* Compute hashing function. */
2774 for (i
= 0; i
< len
; i
++)
2775 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2780 /* Wrapper of compare_constant, for the htab interface. */
2782 const_desc_eq (const void *p1
, const void *p2
)
2784 const struct constant_descriptor_tree
*const c1
2785 = (const struct constant_descriptor_tree
*) p1
;
2786 const struct constant_descriptor_tree
*const c2
2787 = (const struct constant_descriptor_tree
*) p2
;
2788 if (c1
->hash
!= c2
->hash
)
2790 return compare_constant (c1
->value
, c2
->value
);
2793 /* Compare t1 and t2, and return 1 only if they are known to result in
2794 the same bit pattern on output. */
2797 compare_constant (const tree t1
, const tree t2
)
2799 enum tree_code typecode
;
2801 if (t1
== NULL_TREE
)
2802 return t2
== NULL_TREE
;
2803 if (t2
== NULL_TREE
)
2806 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2809 switch (TREE_CODE (t1
))
2812 /* Integer constants are the same only if the same width of type. */
2813 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2815 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2817 return tree_int_cst_equal (t1
, t2
);
2820 /* Real constants are the same only if the same width of type. */
2821 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2824 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2827 /* Fixed constants are the same only if the same width of type. */
2828 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2831 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2834 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2837 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2838 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2839 TREE_STRING_LENGTH (t1
)));
2842 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2843 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2849 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
2852 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
2853 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
2854 VECTOR_CST_ELT (t2
, i
)))
2862 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
2863 unsigned HOST_WIDE_INT idx
;
2865 typecode
= TREE_CODE (TREE_TYPE (t1
));
2866 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2869 if (typecode
== ARRAY_TYPE
)
2871 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2872 /* For arrays, check that the sizes all match. */
2873 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2875 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2880 /* For record and union constructors, require exact type
2882 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2886 v1
= CONSTRUCTOR_ELTS (t1
);
2887 v2
= CONSTRUCTOR_ELTS (t2
);
2888 if (vec_safe_length (v1
) != vec_safe_length (v2
))
2891 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
2893 constructor_elt
*c1
= &(*v1
)[idx
];
2894 constructor_elt
*c2
= &(*v2
)[idx
];
2896 /* Check that each value is the same... */
2897 if (!compare_constant (c1
->value
, c2
->value
))
2899 /* ... and that they apply to the same fields! */
2900 if (typecode
== ARRAY_TYPE
)
2902 if (!compare_constant (c1
->index
, c2
->index
))
2907 if (c1
->index
!= c2
->index
)
2918 struct addr_const value1
, value2
;
2922 decode_addr_const (t1
, &value1
);
2923 decode_addr_const (t2
, &value2
);
2925 if (value1
.offset
!= value2
.offset
)
2928 code
= GET_CODE (value1
.base
);
2929 if (code
!= GET_CODE (value2
.base
))
2935 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2939 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
2940 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
2950 case POINTER_PLUS_EXPR
:
2953 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2954 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2957 case VIEW_CONVERT_EXPR
:
2958 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2967 /* Make a copy of the whole tree structure for a constant. This
2968 handles the same types of nodes that compare_constant handles. */
2971 copy_constant (tree exp
)
2973 switch (TREE_CODE (exp
))
2976 /* For ADDR_EXPR, we do not want to copy the decl whose address
2977 is requested. We do want to copy constants though. */
2978 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2979 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2980 copy_constant (TREE_OPERAND (exp
, 0)));
2982 return copy_node (exp
);
2988 return copy_node (exp
);
2991 return build_complex (TREE_TYPE (exp
),
2992 copy_constant (TREE_REALPART (exp
)),
2993 copy_constant (TREE_IMAGPART (exp
)));
2996 case POINTER_PLUS_EXPR
:
2998 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
2999 copy_constant (TREE_OPERAND (exp
, 0)),
3000 copy_constant (TREE_OPERAND (exp
, 1)));
3003 case VIEW_CONVERT_EXPR
:
3004 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3005 copy_constant (TREE_OPERAND (exp
, 0)));
3008 return build_vector (TREE_TYPE (exp
), VECTOR_CST_ELTS (exp
));
3012 tree copy
= copy_node (exp
);
3013 vec
<constructor_elt
, va_gc
> *v
;
3014 unsigned HOST_WIDE_INT idx
;
3015 tree purpose
, value
;
3017 vec_alloc (v
, vec_safe_length (CONSTRUCTOR_ELTS (exp
)));
3018 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3020 constructor_elt ce
= {purpose
, copy_constant (value
)};
3023 CONSTRUCTOR_ELTS (copy
) = v
;
3032 /* Return the section into which constant EXP should be placed. */
3035 get_constant_section (tree exp
, unsigned int align
)
3037 return targetm
.asm_out
.select_section (exp
,
3038 compute_reloc_for_constant (exp
),
3042 /* Return the size of constant EXP in bytes. */
3044 static HOST_WIDE_INT
3045 get_constant_size (tree exp
)
3049 size
= int_size_in_bytes (TREE_TYPE (exp
));
3050 if (TREE_CODE (exp
) == STRING_CST
)
3051 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3055 /* Subroutine of output_constant_def:
3056 No constant equal to EXP is known to have been output.
3057 Make a constant descriptor to enter EXP in the hash table.
3058 Assign the label number and construct RTL to refer to the
3059 constant's location in memory.
3060 Caller is responsible for updating the hash table. */
3062 static struct constant_descriptor_tree
*
3063 build_constant_desc (tree exp
)
3065 struct constant_descriptor_tree
*desc
;
3071 desc
= ggc_alloc_constant_descriptor_tree ();
3072 desc
->value
= copy_constant (exp
);
3074 /* Propagate marked-ness to copied constant. */
3075 if (flag_mudflap
&& mf_marked_p (exp
))
3076 mf_mark (desc
->value
);
3078 /* Create a string containing the label name, in LABEL. */
3079 labelno
= const_labelno
++;
3080 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3082 /* Construct the VAR_DECL associated with the constant. */
3083 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3085 DECL_ARTIFICIAL (decl
) = 1;
3086 DECL_IGNORED_P (decl
) = 1;
3087 TREE_READONLY (decl
) = 1;
3088 TREE_STATIC (decl
) = 1;
3089 TREE_ADDRESSABLE (decl
) = 1;
3090 /* We don't set the RTL yet as this would cause varpool to assume that the
3091 variable is referenced. Moreover, it would just be dropped in LTO mode.
3092 Instead we set the flag that will be recognized in make_decl_rtl. */
3093 DECL_IN_CONSTANT_POOL (decl
) = 1;
3094 DECL_INITIAL (decl
) = desc
->value
;
3095 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3096 architectures so use DATA_ALIGNMENT as well, except for strings. */
3097 if (TREE_CODE (exp
) == STRING_CST
)
3099 #ifdef CONSTANT_ALIGNMENT
3100 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3104 align_variable (decl
, 0);
3106 /* Now construct the SYMBOL_REF and the MEM. */
3107 if (use_object_blocks_p ())
3109 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3110 symbol
= create_block_symbol (ggc_strdup (label
),
3111 get_block_for_section (sect
), -1);
3114 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3115 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3116 SET_SYMBOL_REF_DECL (symbol
, decl
);
3117 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3119 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3120 set_mem_attributes (rtl
, exp
, 1);
3121 set_mem_alias_set (rtl
, 0);
3122 set_mem_alias_set (rtl
, const_alias_set
);
3124 /* We cannot share RTX'es in pool entries.
3125 Mark this piece of RTL as required for unsharing. */
3126 RTX_FLAG (rtl
, used
) = 1;
3128 /* Set flags or add text to the name to record information, such as
3129 that it is a local symbol. If the name is changed, the macro
3130 ASM_OUTPUT_LABELREF will have to know how to strip this
3131 information. This call might invalidate our local variable
3132 SYMBOL; we can't use it afterward. */
3133 targetm
.encode_section_info (exp
, rtl
, true);
3140 /* Return an rtx representing a reference to constant data in memory
3141 for the constant expression EXP.
3143 If assembler code for such a constant has already been output,
3144 return an rtx to refer to it.
3145 Otherwise, output such a constant in memory
3146 and generate an rtx for it.
3148 If DEFER is nonzero, this constant can be deferred and output only
3149 if referenced in the function after all optimizations.
3151 `const_desc_table' records which constants already have label strings. */
3154 output_constant_def (tree exp
, int defer
)
3156 struct constant_descriptor_tree
*desc
;
3157 struct constant_descriptor_tree key
;
3160 /* Look up EXP in the table of constant descriptors. If we didn't find
3161 it, create a new one. */
3163 key
.hash
= const_hash_1 (exp
);
3164 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3166 desc
= (struct constant_descriptor_tree
*) *loc
;
3169 desc
= build_constant_desc (exp
);
3170 desc
->hash
= key
.hash
;
3174 maybe_output_constant_def_contents (desc
, defer
);
3178 /* Subroutine of output_constant_def: Decide whether or not we need to
3179 output the constant DESC now, and if so, do it. */
3181 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3184 rtx symbol
= XEXP (desc
->rtl
, 0);
3185 tree exp
= desc
->value
;
3187 if (flag_syntax_only
)
3190 if (TREE_ASM_WRITTEN (exp
))
3191 /* Already output; don't do it again. */
3194 /* We can always defer constants as long as the context allows
3198 /* Increment n_deferred_constants if it exists. It needs to be at
3199 least as large as the number of constants actually referred to
3200 by the function. If it's too small we'll stop looking too early
3201 and fail to emit constants; if it's too large we'll only look
3202 through the entire function when we could have stopped earlier. */
3204 n_deferred_constants
++;
3208 output_constant_def_contents (symbol
);
3211 /* Subroutine of output_constant_def_contents. Output the definition
3212 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3213 constant's alignment in bits. */
3216 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3220 size
= get_constant_size (exp
);
3222 /* Do any machine/system dependent processing of the constant. */
3223 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3225 /* Output the value of EXP. */
3226 output_constant (exp
, size
, align
);
3229 /* We must output the constant data referred to by SYMBOL; do so. */
3232 output_constant_def_contents (rtx symbol
)
3234 tree decl
= SYMBOL_REF_DECL (symbol
);
3235 tree exp
= DECL_INITIAL (decl
);
3238 /* Make sure any other constants whose addresses appear in EXP
3239 are assigned label numbers. */
3240 output_addressed_constants (exp
);
3242 /* We are no longer deferring this constant. */
3243 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3245 /* If the constant is part of an object block, make sure that the
3246 decl has been positioned within its block, but do not write out
3247 its definition yet. output_object_blocks will do that later. */
3248 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3249 place_block_symbol (symbol
);
3252 align
= DECL_ALIGN (decl
);
3253 switch_to_section (get_constant_section (exp
, align
));
3254 if (align
> BITS_PER_UNIT
)
3255 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3256 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3259 mudflap_enqueue_constant (exp
);
3262 /* Look up EXP in the table of constant descriptors. Return the rtl
3263 if it has been emitted, else null. */
3266 lookup_constant_def (tree exp
)
3268 struct constant_descriptor_tree
*desc
;
3269 struct constant_descriptor_tree key
;
3272 key
.hash
= const_hash_1 (exp
);
3273 desc
= (struct constant_descriptor_tree
*)
3274 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3276 return (desc
? desc
->rtl
: NULL_RTX
);
3279 /* Return a tree representing a reference to constant data in memory
3280 for the constant expression EXP.
3282 This is the counterpart of output_constant_def at the Tree level. */
3285 tree_output_constant_def (tree exp
)
3287 struct constant_descriptor_tree
*desc
, key
;
3291 /* Look up EXP in the table of constant descriptors. If we didn't find
3292 it, create a new one. */
3294 key
.hash
= const_hash_1 (exp
);
3295 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3297 desc
= (struct constant_descriptor_tree
*) *loc
;
3300 desc
= build_constant_desc (exp
);
3301 desc
->hash
= key
.hash
;
3305 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3306 varpool_finalize_decl (decl
);
3310 /* Used in the hash tables to avoid outputting the same constant
3311 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3312 are output once per function, not once per file. */
3313 /* ??? Only a few targets need per-function constant pools. Most
3314 can use one per-file pool. Should add a targetm bit to tell the
3317 struct GTY(()) rtx_constant_pool
{
3318 /* Pointers to first and last constant in pool, as ordered by offset. */
3319 struct constant_descriptor_rtx
*first
;
3320 struct constant_descriptor_rtx
*last
;
3322 /* Hash facility for making memory-constants from constant rtl-expressions.
3323 It is used on RISC machines where immediate integer arguments and
3324 constant addresses are restricted so that such constants must be stored
3326 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3328 /* Current offset in constant pool (does not include any
3329 machine-specific header). */
3330 HOST_WIDE_INT offset
;
3333 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3334 struct constant_descriptor_rtx
*next
;
3338 HOST_WIDE_INT offset
;
3340 enum machine_mode mode
;
3346 /* Hash and compare functions for const_rtx_htab. */
3349 const_desc_rtx_hash (const void *ptr
)
3351 const struct constant_descriptor_rtx
*const desc
3352 = (const struct constant_descriptor_rtx
*) ptr
;
3357 const_desc_rtx_eq (const void *a
, const void *b
)
3359 const struct constant_descriptor_rtx
*const x
3360 = (const struct constant_descriptor_rtx
*) a
;
3361 const struct constant_descriptor_rtx
*const y
3362 = (const struct constant_descriptor_rtx
*) b
;
3364 if (x
->mode
!= y
->mode
)
3366 return rtx_equal_p (x
->constant
, y
->constant
);
3369 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3372 const_rtx_hash_1 (rtx
*xp
, void *data
)
3374 unsigned HOST_WIDE_INT hwi
;
3375 enum machine_mode mode
;
3381 code
= GET_CODE (x
);
3382 mode
= GET_MODE (x
);
3383 h
= (hashval_t
) code
* 1048573 + mode
;
3391 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3392 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3395 h
^= (hashval_t
) hwi
;
3396 for (i
= 1; i
< n
; ++i
)
3399 h
^= (hashval_t
) hwi
;
3405 if (mode
== VOIDmode
)
3407 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3411 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3415 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3421 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3422 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3427 h
^= htab_hash_string (XSTR (x
, 0));
3431 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3435 case UNSPEC_VOLATILE
:
3436 h
= h
* 251 + XINT (x
, 1);
3443 hp
= (hashval_t
*) data
;
3444 *hp
= *hp
* 509 + h
;
3448 /* Compute a hash value for X, which should be a constant. */
3451 const_rtx_hash (rtx x
)
3454 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3459 /* Create and return a new rtx constant pool. */
3461 static struct rtx_constant_pool
*
3462 create_constant_pool (void)
3464 struct rtx_constant_pool
*pool
;
3466 pool
= ggc_alloc_rtx_constant_pool ();
3467 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3468 const_desc_rtx_eq
, NULL
);
3475 /* Initialize constant pool hashing for a new function. */
3478 init_varasm_status (void)
3480 crtl
->varasm
.pool
= create_constant_pool ();
3481 crtl
->varasm
.deferred_constants
= 0;
3484 /* Given a MINUS expression, simplify it if both sides
3485 include the same symbol. */
3488 simplify_subtraction (rtx x
)
3490 rtx r
= simplify_rtx (x
);
3494 /* Given a constant rtx X, make (or find) a memory constant for its value
3495 and return a MEM rtx to refer to it in memory. */
3498 force_const_mem (enum machine_mode mode
, rtx x
)
3500 struct constant_descriptor_rtx
*desc
, tmp
;
3501 struct rtx_constant_pool
*pool
;
3508 /* If we're not allowed to drop X into the constant pool, don't. */
3509 if (targetm
.cannot_force_const_mem (mode
, x
))
3512 /* Record that this function has used a constant pool entry. */
3513 crtl
->uses_const_pool
= 1;
3515 /* Decide which pool to use. */
3516 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3517 ? shared_constant_pool
3518 : crtl
->varasm
.pool
);
3520 /* Lookup the value in the hashtable. */
3523 hash
= const_rtx_hash (x
);
3524 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3525 desc
= (struct constant_descriptor_rtx
*) *slot
;
3527 /* If the constant was already present, return its memory. */
3529 return copy_rtx (desc
->mem
);
3531 /* Otherwise, create a new descriptor. */
3532 desc
= ggc_alloc_constant_descriptor_rtx ();
3535 /* Align the location counter as required by EXP's data type. */
3536 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3537 #ifdef CONSTANT_ALIGNMENT
3539 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3540 if (type
!= NULL_TREE
)
3541 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3545 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3546 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3549 desc
->constant
= copy_rtx (tmp
.constant
);
3550 desc
->offset
= pool
->offset
;
3553 desc
->align
= align
;
3554 desc
->labelno
= const_labelno
;
3557 pool
->offset
+= GET_MODE_SIZE (mode
);
3559 pool
->last
->next
= desc
;
3561 pool
->first
= pool
->last
= desc
;
3564 /* Create a string containing the label name, in LABEL. */
3565 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3568 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3569 the constants pool. */
3570 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3572 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3573 symbol
= create_block_symbol (ggc_strdup (label
),
3574 get_block_for_section (sect
), -1);
3577 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3579 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3580 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3581 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3583 /* Construct the MEM. */
3584 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3585 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3586 set_mem_align (def
, align
);
3588 /* If we're dropping a label to the constant pool, make sure we
3590 if (GET_CODE (x
) == LABEL_REF
)
3591 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3593 return copy_rtx (def
);
3596 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3599 get_pool_constant (rtx addr
)
3601 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3604 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3605 and whether it has been output or not. */
3608 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3610 struct constant_descriptor_rtx
*desc
;
3612 desc
= SYMBOL_REF_CONSTANT (addr
);
3613 *pmarked
= (desc
->mark
!= 0);
3614 return desc
->constant
;
3617 /* Similar, return the mode. */
3620 get_pool_mode (const_rtx addr
)
3622 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3625 /* Return the size of the constant pool. */
3628 get_pool_size (void)
3630 return crtl
->varasm
.pool
->offset
;
3633 /* Worker function for output_constant_pool_1. Emit assembly for X
3634 in MODE with known alignment ALIGN. */
3637 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3639 switch (GET_MODE_CLASS (mode
))
3642 case MODE_DECIMAL_FLOAT
:
3646 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3647 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3648 assemble_real (r
, mode
, align
);
3653 case MODE_PARTIAL_INT
:
3658 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3661 case MODE_VECTOR_FLOAT
:
3662 case MODE_VECTOR_INT
:
3663 case MODE_VECTOR_FRACT
:
3664 case MODE_VECTOR_UFRACT
:
3665 case MODE_VECTOR_ACCUM
:
3666 case MODE_VECTOR_UACCUM
:
3669 enum machine_mode submode
= GET_MODE_INNER (mode
);
3670 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3672 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3673 units
= CONST_VECTOR_NUNITS (x
);
3675 for (i
= 0; i
< units
; i
++)
3677 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3678 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3688 /* Worker function for output_constant_pool. Emit constant DESC,
3689 giving it ALIGN bits of alignment. */
3692 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3699 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3700 whose CODE_LABEL has been deleted. This can occur if a jump table
3701 is eliminated by optimization. If so, write a constant of zero
3702 instead. Note that this can also happen by turning the
3703 CODE_LABEL into a NOTE. */
3704 /* ??? This seems completely and utterly wrong. Certainly it's
3705 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3706 functioning even with INSN_DELETED_P and friends. */
3709 switch (GET_CODE (tmp
))
3712 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3713 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3715 tmp
= XEXP (XEXP (tmp
, 0), 0);
3719 tmp
= XEXP (tmp
, 0);
3720 gcc_assert (!INSN_DELETED_P (tmp
));
3721 gcc_assert (!NOTE_P (tmp
)
3722 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3729 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3730 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3731 align
, desc
->labelno
, done
);
3734 assemble_align (align
);
3736 /* Output the label. */
3737 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3739 /* Output the data. */
3740 output_constant_pool_2 (desc
->mode
, x
, align
);
3742 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3743 sections have proper size. */
3744 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3746 && (in_section
->common
.flags
& SECTION_MERGE
))
3747 assemble_align (align
);
3749 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3755 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3756 to as used. Emit referenced deferred strings. This function can
3757 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3760 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3762 rtx x
= *current_rtx
;
3764 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3767 if (CONSTANT_POOL_ADDRESS_P (x
))
3769 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3770 if (desc
->mark
== 0)
3773 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3776 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3778 tree decl
= SYMBOL_REF_DECL (x
);
3779 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3781 n_deferred_constants
--;
3782 output_constant_def_contents (x
);
3789 /* Look through appropriate parts of INSN, marking all entries in the
3790 constant pool which are actually being used. Entries that are only
3791 referenced by other constants are also marked as used. Emit
3792 deferred strings that are used. */
3795 mark_constants (rtx insn
)
3800 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3801 insns, not any notes that may be attached. We don't want to mark
3802 a constant just because it happens to appear in a REG_EQUIV note. */
3803 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3805 rtx seq
= PATTERN (insn
);
3806 int i
, n
= XVECLEN (seq
, 0);
3807 for (i
= 0; i
< n
; ++i
)
3809 rtx subinsn
= XVECEXP (seq
, 0, i
);
3810 if (INSN_P (subinsn
))
3811 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3815 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3818 /* Look through the instructions for this function, and mark all the
3819 entries in POOL which are actually being used. Emit deferred constants
3820 which have indeed been used. */
3823 mark_constant_pool (void)
3827 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3830 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3831 mark_constants (insn
);
3833 for (link
= crtl
->epilogue_delay_list
;
3835 link
= XEXP (link
, 1))
3836 mark_constants (XEXP (link
, 0));
3839 /* Write all the constants in POOL. */
3842 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3844 struct constant_descriptor_rtx
*desc
;
3846 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3849 /* If the constant is part of an object_block, make sure that
3850 the constant has been positioned within its block, but do not
3851 write out its definition yet. output_object_blocks will do
3853 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3854 && SYMBOL_REF_BLOCK (desc
->sym
))
3855 place_block_symbol (desc
->sym
);
3858 switch_to_section (targetm
.asm_out
.select_rtx_section
3859 (desc
->mode
, desc
->constant
, desc
->align
));
3860 output_constant_pool_1 (desc
, desc
->align
);
3865 /* Mark all constants that are used in the current function, then write
3866 out the function's private constant pool. */
3869 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3870 tree fndecl ATTRIBUTE_UNUSED
)
3872 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3874 /* It is possible for gcc to call force_const_mem and then to later
3875 discard the instructions which refer to the constant. In such a
3876 case we do not need to output the constant. */
3877 mark_constant_pool ();
3879 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3880 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3883 output_constant_pool_contents (pool
);
3885 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3886 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3890 /* Write the contents of the shared constant pool. */
3893 output_shared_constant_pool (void)
3895 output_constant_pool_contents (shared_constant_pool
);
3898 /* Determine what kind of relocations EXP may need. */
3901 compute_reloc_for_constant (tree exp
)
3903 int reloc
= 0, reloc2
;
3906 switch (TREE_CODE (exp
))
3910 /* Go inside any operations that get_inner_reference can handle and see
3911 if what's inside is a constant: no need to do anything here for
3912 addresses of variables or functions. */
3913 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3914 tem
= TREE_OPERAND (tem
, 0))
3917 if (TREE_CODE (tem
) == MEM_REF
3918 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
3920 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
3924 if (TREE_PUBLIC (tem
))
3931 case POINTER_PLUS_EXPR
:
3932 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3933 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3937 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3938 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3939 /* The difference of two local labels is computable at link time. */
3940 if (reloc
== 1 && reloc2
== 1)
3947 case VIEW_CONVERT_EXPR
:
3948 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3953 unsigned HOST_WIDE_INT idx
;
3954 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3956 reloc
|= compute_reloc_for_constant (tem
);
3966 /* Find all the constants whose addresses are referenced inside of EXP,
3967 and make sure assembler code with a label has been output for each one.
3968 Indicate whether an ADDR_EXPR has been encountered. */
3971 output_addressed_constants (tree exp
)
3975 switch (TREE_CODE (exp
))
3979 /* Go inside any operations that get_inner_reference can handle and see
3980 if what's inside is a constant: no need to do anything here for
3981 addresses of variables or functions. */
3982 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3983 tem
= TREE_OPERAND (tem
, 0))
3986 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3987 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
3988 tem
= DECL_INITIAL (tem
);
3990 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
3991 output_constant_def (tem
, 0);
3993 if (TREE_CODE (tem
) == MEM_REF
)
3994 output_addressed_constants (TREE_OPERAND (tem
, 0));
3998 case POINTER_PLUS_EXPR
:
4000 output_addressed_constants (TREE_OPERAND (exp
, 1));
4004 case VIEW_CONVERT_EXPR
:
4005 output_addressed_constants (TREE_OPERAND (exp
, 0));
4010 unsigned HOST_WIDE_INT idx
;
4011 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4013 output_addressed_constants (tem
);
4022 /* Whether a constructor CTOR is a valid static constant initializer if all
4023 its elements are. This used to be internal to initializer_constant_valid_p
4024 and has been exposed to let other functions like categorize_ctor_elements
4025 evaluate the property while walking a constructor for other purposes. */
4028 constructor_static_from_elts_p (const_tree ctor
)
4030 return (TREE_CONSTANT (ctor
)
4031 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4032 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4033 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4036 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4039 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4040 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4041 which are valid when ENDTYPE is an integer of any size; in
4042 particular, this does not accept a pointer minus a constant. This
4043 returns null_pointer_node if the VALUE is an absolute constant
4044 which can be used to initialize a static variable. Otherwise it
4048 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4052 if (!INTEGRAL_TYPE_P (endtype
))
4055 op0
= TREE_OPERAND (value
, 0);
4056 op1
= TREE_OPERAND (value
, 1);
4058 /* Like STRIP_NOPS except allow the operand mode to widen. This
4059 works around a feature of fold that simplifies (int)(p1 - p2) to
4060 ((int)p1 - (int)p2) under the theory that the narrower operation
4063 while (CONVERT_EXPR_P (op0
)
4064 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4066 tree inner
= TREE_OPERAND (op0
, 0);
4067 if (inner
== error_mark_node
4068 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4069 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4070 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4075 while (CONVERT_EXPR_P (op1
)
4076 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4078 tree inner
= TREE_OPERAND (op1
, 0);
4079 if (inner
== error_mark_node
4080 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4081 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4082 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4087 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4091 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4092 cache
? cache
+ 2 : NULL
);
4093 /* Both initializers must be known. */
4097 && (op0
== null_pointer_node
4098 || TREE_CODE (value
) == MINUS_EXPR
))
4099 return null_pointer_node
;
4101 /* Support differences between labels. */
4102 if (TREE_CODE (op0
) == LABEL_DECL
4103 && TREE_CODE (op1
) == LABEL_DECL
)
4104 return null_pointer_node
;
4106 if (TREE_CODE (op0
) == STRING_CST
4107 && TREE_CODE (op1
) == STRING_CST
4108 && operand_equal_p (op0
, op1
, 1))
4109 return null_pointer_node
;
4115 /* Helper function of initializer_constant_valid_p.
4116 Return nonzero if VALUE is a valid constant-valued expression
4117 for use in initializing a static variable; one that can be an
4118 element of a "constant" initializer.
4120 Return null_pointer_node if the value is absolute;
4121 if it is relocatable, return the variable that determines the relocation.
4122 We assume that VALUE has been folded as much as possible;
4123 therefore, we do not need to check for such things as
4124 arithmetic-combinations of integers.
4126 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4129 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4133 switch (TREE_CODE (value
))
4136 if (constructor_static_from_elts_p (value
))
4138 unsigned HOST_WIDE_INT idx
;
4140 bool absolute
= true;
4142 if (cache
&& cache
[0] == value
)
4144 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4147 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4154 cache
[1] = NULL_TREE
;
4158 if (reloc
!= null_pointer_node
)
4161 /* For a non-absolute relocation, there is no single
4162 variable that can be "the variable that determines the
4167 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4169 return absolute
? null_pointer_node
: error_mark_node
;
4172 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4180 return null_pointer_node
;
4185 tree op0
= staticp (TREE_OPERAND (value
, 0));
4188 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4189 to be a constant, this is old-skool offsetof-like nonsense. */
4190 if (TREE_CODE (op0
) == INDIRECT_REF
4191 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4192 return null_pointer_node
;
4193 /* Taking the address of a nested function involves a trampoline,
4194 unless we don't need or want one. */
4195 if (TREE_CODE (op0
) == FUNCTION_DECL
4196 && DECL_STATIC_CHAIN (op0
)
4197 && !TREE_NO_TRAMPOLINE (value
))
4199 /* "&{...}" requires a temporary to hold the constructed
4201 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4207 case NON_LVALUE_EXPR
:
4208 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4211 case VIEW_CONVERT_EXPR
:
4213 tree src
= TREE_OPERAND (value
, 0);
4214 tree src_type
= TREE_TYPE (src
);
4215 tree dest_type
= TREE_TYPE (value
);
4217 /* Allow view-conversions from aggregate to non-aggregate type only
4218 if the bit pattern is fully preserved afterwards; otherwise, the
4219 RTL expander won't be able to apply a subsequent transformation
4220 to the underlying constructor. */
4221 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4223 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4224 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4229 /* Allow all other kinds of view-conversion. */
4230 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4235 tree src
= TREE_OPERAND (value
, 0);
4236 tree src_type
= TREE_TYPE (src
);
4237 tree dest_type
= TREE_TYPE (value
);
4239 /* Allow conversions between pointer types, floating-point
4240 types, and offset types. */
4241 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4242 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4243 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4244 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4245 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4247 /* Allow length-preserving conversions between integer types. */
4248 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4249 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4250 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4252 /* Allow conversions between other integer types only if
4254 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4256 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4257 if (inner
== null_pointer_node
)
4258 return null_pointer_node
;
4262 /* Allow (int) &foo provided int is as wide as a pointer. */
4263 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4264 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4265 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4267 /* Likewise conversions from int to pointers, but also allow
4268 conversions from 0. */
4269 if ((POINTER_TYPE_P (dest_type
)
4270 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4271 && INTEGRAL_TYPE_P (src_type
))
4273 if (TREE_CODE (src
) == INTEGER_CST
4274 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4275 return null_pointer_node
;
4276 if (integer_zerop (src
))
4277 return null_pointer_node
;
4278 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4279 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4282 /* Allow conversions to struct or union types if the value
4284 if (TREE_CODE (dest_type
) == RECORD_TYPE
4285 || TREE_CODE (dest_type
) == UNION_TYPE
)
4286 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4290 case POINTER_PLUS_EXPR
:
4292 /* Any valid floating-point constants will have been folded by now;
4293 with -frounding-math we hit this with addition of two constants. */
4294 if (TREE_CODE (endtype
) == REAL_TYPE
)
4296 if (cache
&& cache
[0] == value
)
4298 if (! INTEGRAL_TYPE_P (endtype
)
4299 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4301 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4303 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4306 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4307 endtype
, ncache
+ 2);
4308 /* If either term is absolute, use the other term's relocation. */
4309 if (valid0
== null_pointer_node
)
4311 else if (valid1
== null_pointer_node
)
4313 /* Support narrowing pointer differences. */
4315 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4319 /* Support narrowing pointer differences. */
4320 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4329 if (TREE_CODE (endtype
) == REAL_TYPE
)
4331 if (cache
&& cache
[0] == value
)
4333 if (! INTEGRAL_TYPE_P (endtype
)
4334 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4336 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4338 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4341 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4342 endtype
, ncache
+ 2);
4343 /* Win if second argument is absolute. */
4344 if (valid1
== null_pointer_node
)
4346 /* Win if both arguments have the same relocation.
4347 Then the value is absolute. */
4348 else if (valid0
== valid1
&& valid0
!= 0)
4349 ret
= null_pointer_node
;
4350 /* Since GCC guarantees that string constants are unique in the
4351 generated code, a subtraction between two copies of the same
4352 constant string is absolute. */
4353 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4354 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4355 && operand_equal_p (valid0
, valid1
, 1))
4356 ret
= null_pointer_node
;
4357 /* Support narrowing differences. */
4359 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4363 /* Support narrowing differences. */
4364 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4379 /* Return nonzero if VALUE is a valid constant-valued expression
4380 for use in initializing a static variable; one that can be an
4381 element of a "constant" initializer.
4383 Return null_pointer_node if the value is absolute;
4384 if it is relocatable, return the variable that determines the relocation.
4385 We assume that VALUE has been folded as much as possible;
4386 therefore, we do not need to check for such things as
4387 arithmetic-combinations of integers. */
4389 initializer_constant_valid_p (tree value
, tree endtype
)
4391 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4394 /* Return true if VALUE is a valid constant-valued expression
4395 for use in initializing a static bit-field; one that can be
4396 an element of a "constant" initializer. */
4399 initializer_constant_valid_for_bitfield_p (tree value
)
4401 /* For bitfields we support integer constants or possibly nested aggregates
4403 switch (TREE_CODE (value
))
4407 unsigned HOST_WIDE_INT idx
;
4410 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4411 if (!initializer_constant_valid_for_bitfield_p (elt
))
4420 case VIEW_CONVERT_EXPR
:
4421 case NON_LVALUE_EXPR
:
4423 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4432 /* output_constructor outer state of relevance in recursive calls, typically
4433 for nested aggregate bitfields. */
4436 unsigned int bit_offset
; /* current position in ... */
4437 int byte
; /* ... the outer byte buffer. */
4440 static unsigned HOST_WIDE_INT
4441 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4444 /* Output assembler code for constant EXP to FILE, with no label.
4445 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4446 Assumes output_addressed_constants has been done on EXP already.
4448 Generate exactly SIZE bytes of assembler data, padding at the end
4449 with zeros if necessary. SIZE must always be specified.
4451 SIZE is important for structure constructors,
4452 since trailing members may have been omitted from the constructor.
4453 It is also important for initialization of arrays from string constants
4454 since the full length of the string constant might not be wanted.
4455 It is also needed for initialization of unions, where the initializer's
4456 type is just one member, and that may not be as long as the union.
4458 There a case in which we would fail to output exactly SIZE bytes:
4459 for a structure constructor that wants to produce more than SIZE bytes.
4460 But such constructors will never be generated for any possible input.
4462 ALIGN is the alignment of the data in bits. */
4465 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4467 enum tree_code code
;
4468 unsigned HOST_WIDE_INT thissize
;
4470 if (size
== 0 || flag_syntax_only
)
4473 /* See if we're trying to initialize a pointer in a non-default mode
4474 to the address of some declaration somewhere. If the target says
4475 the mode is valid for pointers, assume the target has a way of
4477 if (TREE_CODE (exp
) == NOP_EXPR
4478 && POINTER_TYPE_P (TREE_TYPE (exp
))
4479 && targetm
.addr_space
.valid_pointer_mode
4480 (TYPE_MODE (TREE_TYPE (exp
)),
4481 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4483 tree saved_type
= TREE_TYPE (exp
);
4485 /* Peel off any intermediate conversions-to-pointer for valid
4487 while (TREE_CODE (exp
) == NOP_EXPR
4488 && POINTER_TYPE_P (TREE_TYPE (exp
))
4489 && targetm
.addr_space
.valid_pointer_mode
4490 (TYPE_MODE (TREE_TYPE (exp
)),
4491 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4492 exp
= TREE_OPERAND (exp
, 0);
4494 /* If what we're left with is the address of something, we can
4495 convert the address to the final type and output it that
4497 if (TREE_CODE (exp
) == ADDR_EXPR
)
4498 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4499 /* Likewise for constant ints. */
4500 else if (TREE_CODE (exp
) == INTEGER_CST
)
4501 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4502 TREE_INT_CST_HIGH (exp
));
4506 /* Eliminate any conversions since we'll be outputting the underlying
4508 while (CONVERT_EXPR_P (exp
)
4509 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4510 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4512 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4513 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4515 /* Make sure eliminating the conversion is really a no-op, except with
4516 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4517 union types to allow for Ada unchecked unions. */
4518 if (type_size
> op_size
4519 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4520 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4521 /* Keep the conversion. */
4524 exp
= TREE_OPERAND (exp
, 0);
4527 code
= TREE_CODE (TREE_TYPE (exp
));
4528 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4530 /* Allow a constructor with no elements for any data type.
4531 This means to fill the space with zeros. */
4532 if (TREE_CODE (exp
) == CONSTRUCTOR
4533 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4535 assemble_zeros (size
);
4539 if (TREE_CODE (exp
) == FDESC_EXPR
)
4541 #ifdef ASM_OUTPUT_FDESC
4542 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4543 tree decl
= TREE_OPERAND (exp
, 0);
4544 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4551 /* Now output the underlying data. If we've handling the padding, return.
4552 Otherwise, break and ensure SIZE is the size written. */
4559 case REFERENCE_TYPE
:
4561 case FIXED_POINT_TYPE
:
4562 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4563 EXPAND_INITIALIZER
),
4564 MIN (size
, thissize
), align
, 0))
4565 error ("initializer for integer/fixed-point value is too complicated");
4569 if (TREE_CODE (exp
) != REAL_CST
)
4570 error ("initializer for floating value is not a floating constant");
4572 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4576 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4577 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4578 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4583 switch (TREE_CODE (exp
))
4586 output_constructor (exp
, size
, align
, NULL
);
4589 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4591 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4597 unsigned int i
, nalign
;
4598 enum machine_mode inner
;
4600 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4601 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4603 elt_size
= GET_MODE_SIZE (inner
);
4605 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4606 thissize
= elt_size
;
4607 for (i
= 1; i
< VECTOR_CST_NELTS (exp
); ++i
)
4609 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4610 thissize
+= elt_size
;
4621 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4622 output_constructor (exp
, size
, align
, NULL
);
4632 if (size
> thissize
)
4633 assemble_zeros (size
- thissize
);
4637 /* Subroutine of output_constructor, used for computing the size of
4638 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4639 type with an unspecified upper bound. */
4641 static unsigned HOST_WIDE_INT
4642 array_size_for_constructor (tree val
)
4645 unsigned HOST_WIDE_INT cnt
;
4646 tree index
, value
, tmp
;
4649 /* This code used to attempt to handle string constants that are not
4650 arrays of single-bytes, but nothing else does, so there's no point in
4652 if (TREE_CODE (val
) == STRING_CST
)
4653 return TREE_STRING_LENGTH (val
);
4655 max_index
= NULL_TREE
;
4656 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4658 if (TREE_CODE (index
) == RANGE_EXPR
)
4659 index
= TREE_OPERAND (index
, 1);
4660 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4664 if (max_index
== NULL_TREE
)
4667 /* Compute the total number of array elements. */
4668 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4669 i
= tree_to_double_int (max_index
) - tree_to_double_int (tmp
);
4670 i
+= double_int_one
;
4672 /* Multiply by the array element unit size to find number of bytes. */
4673 i
*= tree_to_double_int (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4675 gcc_assert (i
.fits_uhwi ());
4679 /* Other datastructures + helpers for output_constructor. */
4681 /* output_constructor local state to support interaction with helpers. */
4685 /* Received arguments. */
4686 tree exp
; /* Constructor expression. */
4687 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4688 unsigned int align
; /* Known initial alignment. */
4690 /* Constructor expression data. */
4691 tree type
; /* Expression type. */
4692 tree field
; /* Current field decl in a record. */
4693 tree min_index
; /* Lower bound if specified for an array. */
4695 /* Output processing state. */
4696 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4697 bool byte_buffer_in_use
; /* Whether byte ... */
4698 int byte
; /* ... contains part of a bitfield byte yet to
4701 int last_relative_index
; /* Implicit or explicit index of the last
4702 array element output within a bitfield. */
4703 /* Current element. */
4704 tree val
; /* Current element value. */
4705 tree index
; /* Current element index. */
4709 /* Helper for output_constructor. From the current LOCAL state, output a
4710 RANGE_EXPR element. */
4713 output_constructor_array_range (oc_local_state
*local
)
4715 unsigned HOST_WIDE_INT fieldsize
4716 = int_size_in_bytes (TREE_TYPE (local
->type
));
4718 HOST_WIDE_INT lo_index
4719 = tree_low_cst (TREE_OPERAND (local
->index
, 0), 0);
4720 HOST_WIDE_INT hi_index
4721 = tree_low_cst (TREE_OPERAND (local
->index
, 1), 0);
4722 HOST_WIDE_INT index
;
4725 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4727 for (index
= lo_index
; index
<= hi_index
; index
++)
4729 /* Output the element's initial value. */
4730 if (local
->val
== NULL_TREE
)
4731 assemble_zeros (fieldsize
);
4733 output_constant (local
->val
, fieldsize
, align2
);
4735 /* Count its size. */
4736 local
->total_bytes
+= fieldsize
;
4740 /* Helper for output_constructor. From the current LOCAL state, output a
4741 field element that is not true bitfield or part of an outer one. */
4744 output_constructor_regular_field (oc_local_state
*local
)
4746 /* Field size and position. Since this structure is static, we know the
4747 positions are constant. */
4748 unsigned HOST_WIDE_INT fieldsize
;
4749 HOST_WIDE_INT fieldpos
;
4751 unsigned int align2
;
4753 if (local
->index
!= NULL_TREE
)
4755 /* Perform the index calculation in modulo arithmetic but
4756 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4757 but we are using an unsigned sizetype. */
4758 unsigned prec
= TYPE_PRECISION (sizetype
);
4759 double_int idx
= tree_to_double_int (local
->index
)
4760 - tree_to_double_int (local
->min_index
);
4761 idx
= idx
.sext (prec
);
4762 fieldpos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)), 1)
4765 else if (local
->field
!= NULL_TREE
)
4766 fieldpos
= int_byte_position (local
->field
);
4770 /* Output any buffered-up bit-fields preceding this element. */
4771 if (local
->byte_buffer_in_use
)
4773 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4774 local
->total_bytes
++;
4775 local
->byte_buffer_in_use
= false;
4778 /* Advance to offset of this element.
4779 Note no alignment needed in an array, since that is guaranteed
4780 if each element has the proper size. */
4781 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4782 && fieldpos
!= local
->total_bytes
)
4784 gcc_assert (fieldpos
>= local
->total_bytes
);
4785 assemble_zeros (fieldpos
- local
->total_bytes
);
4786 local
->total_bytes
= fieldpos
;
4789 /* Find the alignment of this element. */
4790 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4792 /* Determine size this element should occupy. */
4797 /* If this is an array with an unspecified upper bound,
4798 the initializer determines the size. */
4799 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4800 but we cannot do this until the deprecated support for
4801 initializing zero-length array members is removed. */
4802 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4803 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4804 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4806 fieldsize
= array_size_for_constructor (local
->val
);
4807 /* Given a non-empty initialization, this field had
4809 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4812 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (local
->field
), 1);
4815 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4817 /* Output the element's initial value. */
4818 if (local
->val
== NULL_TREE
)
4819 assemble_zeros (fieldsize
);
4821 output_constant (local
->val
, fieldsize
, align2
);
4823 /* Count its size. */
4824 local
->total_bytes
+= fieldsize
;
4827 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4828 output an element that is a true bitfield or part of an outer one. */
4831 output_constructor_bitfield (oc_local_state
*local
, oc_outer_state
*outer
)
4833 /* Bit size of this element. */
4834 HOST_WIDE_INT ebitsize
4836 ? tree_low_cst (DECL_SIZE (local
->field
), 1)
4837 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local
->type
)), 1));
4839 /* Relative index of this element if this is an array component. */
4840 HOST_WIDE_INT relative_index
4843 ? (tree_low_cst (local
->index
, 0)
4844 - tree_low_cst (local
->min_index
, 0))
4845 : local
->last_relative_index
+ 1)
4848 /* Bit position of this element from the start of the containing
4850 HOST_WIDE_INT constructor_relative_ebitpos
4852 ? int_bit_position (local
->field
)
4853 : ebitsize
* relative_index
);
4855 /* Bit position of this element from the start of a possibly ongoing
4856 outer byte buffer. */
4857 HOST_WIDE_INT byte_relative_ebitpos
4858 = ((outer
? outer
->bit_offset
: 0) + constructor_relative_ebitpos
);
4860 /* From the start of a possibly ongoing outer byte buffer, offsets to
4861 the first bit of this element and to the first bit past the end of
4863 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4864 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4866 local
->last_relative_index
= relative_index
;
4868 if (local
->val
== NULL_TREE
)
4869 local
->val
= integer_zero_node
;
4871 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4872 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4873 local
->val
= TREE_OPERAND (local
->val
, 0);
4875 if (TREE_CODE (local
->val
) != INTEGER_CST
4876 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4878 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4882 /* If this field does not start in this (or, next) byte,
4884 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4886 /* Output remnant of any bit field in previous bytes. */
4887 if (local
->byte_buffer_in_use
)
4889 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4890 local
->total_bytes
++;
4891 local
->byte_buffer_in_use
= false;
4894 /* If still not at proper byte, advance to there. */
4895 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4897 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
4898 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
4899 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
4903 /* Set up the buffer if necessary. */
4904 if (!local
->byte_buffer_in_use
)
4908 local
->byte_buffer_in_use
= true;
4911 /* If this is nested constructor, recurse passing the bit offset and the
4912 pending data, then retrieve the new pending data afterwards. */
4913 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
4915 oc_outer_state output_state
;
4917 output_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
4918 output_state
.byte
= local
->byte
;
4920 += output_constructor (local
->val
, 0, 0, &output_state
);
4921 local
->byte
= output_state
.byte
;
4925 /* Otherwise, we must split the element into pieces that fall within
4926 separate bytes, and combine each byte with previous or following
4928 while (next_offset
< end_offset
)
4932 HOST_WIDE_INT value
;
4933 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4934 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4936 /* Advance from byte to byte
4937 within this element when necessary. */
4938 while (next_byte
!= local
->total_bytes
)
4940 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4941 local
->total_bytes
++;
4945 /* Number of bits we can process at once
4946 (all part of the same byte). */
4947 this_time
= MIN (end_offset
- next_offset
,
4948 BITS_PER_UNIT
- next_bit
);
4949 if (BYTES_BIG_ENDIAN
)
4951 /* On big-endian machine, take the most significant bits
4952 first (of the bits that are significant)
4953 and put them into bytes from the most significant end. */
4954 shift
= end_offset
- next_offset
- this_time
;
4956 /* Don't try to take a bunch of bits that cross
4957 the word boundary in the INTEGER_CST. We can
4958 only select bits from the LOW or HIGH part
4960 if (shift
< HOST_BITS_PER_WIDE_INT
4961 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4963 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4964 shift
= HOST_BITS_PER_WIDE_INT
;
4967 /* Now get the bits from the appropriate constant word. */
4968 if (shift
< HOST_BITS_PER_WIDE_INT
)
4969 value
= TREE_INT_CST_LOW (local
->val
);
4972 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
4973 value
= TREE_INT_CST_HIGH (local
->val
);
4974 shift
-= HOST_BITS_PER_WIDE_INT
;
4977 /* Get the result. This works only when:
4978 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4979 local
->byte
|= (((value
>> shift
)
4980 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4981 << (BITS_PER_UNIT
- this_time
- next_bit
));
4985 /* On little-endian machines,
4986 take first the least significant bits of the value
4987 and pack them starting at the least significant
4988 bits of the bytes. */
4989 shift
= next_offset
- byte_relative_ebitpos
;
4991 /* Don't try to take a bunch of bits that cross
4992 the word boundary in the INTEGER_CST. We can
4993 only select bits from the LOW or HIGH part
4995 if (shift
< HOST_BITS_PER_WIDE_INT
4996 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4997 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
4999 /* Now get the bits from the appropriate constant word. */
5000 if (shift
< HOST_BITS_PER_WIDE_INT
)
5001 value
= TREE_INT_CST_LOW (local
->val
);
5004 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5005 value
= TREE_INT_CST_HIGH (local
->val
);
5006 shift
-= HOST_BITS_PER_WIDE_INT
;
5009 /* Get the result. This works only when:
5010 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5011 local
->byte
|= (((value
>> shift
)
5012 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5016 next_offset
+= this_time
;
5017 local
->byte_buffer_in_use
= true;
5021 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5022 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5023 caller output state of relevance in recursive invocations. */
5025 static unsigned HOST_WIDE_INT
5026 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5027 unsigned int align
, oc_outer_state
* outer
)
5029 unsigned HOST_WIDE_INT cnt
;
5030 constructor_elt
*ce
;
5032 oc_local_state local
;
5034 /* Setup our local state to communicate with helpers. */
5037 local
.align
= align
;
5039 local
.total_bytes
= 0;
5040 local
.byte_buffer_in_use
= outer
!= NULL
;
5041 local
.byte
= outer
? outer
->byte
: 0;
5043 local
.type
= TREE_TYPE (exp
);
5045 local
.last_relative_index
= -1;
5047 local
.min_index
= NULL_TREE
;
5048 if (TREE_CODE (local
.type
) == ARRAY_TYPE
5049 && TYPE_DOMAIN (local
.type
) != NULL_TREE
)
5050 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5052 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5054 /* As CE goes through the elements of the constant, FIELD goes through the
5055 structure fields if the constant is a structure. If the constant is a
5056 union, we override this by getting the field from the TREE_LIST element.
5057 But the constant could also be an array. Then FIELD is zero.
5059 There is always a maximum of one element in the chain LINK for unions
5060 (even if the initializer in a source program incorrectly contains
5063 local
.field
= NULL_TREE
;
5064 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5065 local
.field
= TYPE_FIELDS (local
.type
);
5068 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5069 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5071 local
.val
= ce
->value
;
5072 local
.index
= NULL_TREE
;
5074 /* The element in a union constructor specifies the proper field
5076 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5077 local
.field
= ce
->index
;
5079 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5080 local
.index
= ce
->index
;
5082 if (local
.field
&& flag_verbose_asm
)
5083 fprintf (asm_out_file
, "%s %s:\n",
5085 DECL_NAME (local
.field
)
5086 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5089 /* Eliminate the marker that makes a cast not be an lvalue. */
5090 if (local
.val
!= NULL_TREE
)
5091 STRIP_NOPS (local
.val
);
5093 /* Output the current element, using the appropriate helper ... */
5095 /* For an array slice not part of an outer bitfield. */
5097 && local
.index
!= NULL_TREE
5098 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5099 output_constructor_array_range (&local
);
5101 /* For a field that is neither a true bitfield nor part of an outer one,
5102 known to be at least byte aligned and multiple-of-bytes long. */
5104 && (local
.field
== NULL_TREE
5105 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5106 output_constructor_regular_field (&local
);
5108 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5109 supported for scalar fields, so we may need to convert first. */
5112 if (TREE_CODE (local
.val
) == REAL_CST
)
5114 = fold_unary (VIEW_CONVERT_EXPR
,
5115 build_nonstandard_integer_type
5116 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5118 output_constructor_bitfield (&local
, outer
);
5122 /* If we are not at toplevel, save the pending data for our caller.
5123 Otherwise output the pending data and padding zeros as needed. */
5125 outer
->byte
= local
.byte
;
5128 if (local
.byte_buffer_in_use
)
5130 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5131 local
.total_bytes
++;
5134 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5136 assemble_zeros (local
.size
- local
.total_bytes
);
5137 local
.total_bytes
= local
.size
;
5141 return local
.total_bytes
;
5144 /* Mark DECL as weak. */
5147 mark_weak (tree decl
)
5149 DECL_WEAK (decl
) = 1;
5151 if (DECL_RTL_SET_P (decl
)
5152 && MEM_P (DECL_RTL (decl
))
5153 && XEXP (DECL_RTL (decl
), 0)
5154 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5155 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5158 /* Merge weak status between NEWDECL and OLDDECL. */
5161 merge_weak (tree newdecl
, tree olddecl
)
5163 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5165 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5168 /* We put the NEWDECL on the weak_decls list at some point
5169 and OLDDECL as well. Keep just OLDDECL on the list. */
5170 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5171 if (TREE_VALUE (*pwd
) == newdecl
)
5173 *pwd
= TREE_CHAIN (*pwd
);
5180 if (DECL_WEAK (newdecl
))
5184 /* NEWDECL is weak, but OLDDECL is not. */
5186 /* If we already output the OLDDECL, we're in trouble; we can't
5187 go back and make it weak. This should never happen in
5188 unit-at-a-time compilation. */
5189 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5191 /* If we've already generated rtl referencing OLDDECL, we may
5192 have done so in a way that will not function properly with
5193 a weak symbol. Again in unit-at-a-time this should be
5195 gcc_assert (!TREE_USED (olddecl
)
5196 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5198 if (TARGET_SUPPORTS_WEAK
)
5200 /* We put the NEWDECL on the weak_decls list at some point.
5201 Replace it with the OLDDECL. */
5202 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5203 if (TREE_VALUE (wd
) == newdecl
)
5205 TREE_VALUE (wd
) = olddecl
;
5208 /* We may not find the entry on the list. If NEWDECL is a
5209 weak alias, then we will have already called
5210 globalize_decl to remove the entry; in that case, we do
5211 not need to do anything. */
5214 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5215 mark_weak (olddecl
);
5218 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5219 weak. Just update NEWDECL to indicate that it's weak too. */
5220 mark_weak (newdecl
);
5223 /* Declare DECL to be a weak symbol. */
5226 declare_weak (tree decl
)
5228 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5229 if (! TREE_PUBLIC (decl
))
5230 error ("weak declaration of %q+D must be public", decl
);
5231 else if (!TARGET_SUPPORTS_WEAK
)
5232 warning (0, "weak declaration of %q+D not supported", decl
);
5235 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5236 DECL_ATTRIBUTES (decl
)
5237 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5241 weak_finish_1 (tree decl
)
5243 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5244 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5247 if (! TREE_USED (decl
))
5250 #ifdef ASM_WEAKEN_DECL
5251 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5253 #ifdef ASM_WEAKEN_LABEL
5254 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5256 #ifdef ASM_OUTPUT_WEAK_ALIAS
5258 static bool warn_once
= 0;
5261 warning (0, "only weak aliases are supported in this configuration");
5271 /* Fiven an assembly name, find the decl it is associated with. */
5273 find_decl (tree target
)
5275 symtab_node node
= symtab_node_for_asm (target
);
5277 return node
->symbol
.decl
;
5281 /* This TREE_LIST contains weakref targets. */
5283 static GTY(()) tree weakref_targets
;
5285 /* Emit any pending weak declarations. */
5292 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5294 tree alias_decl
= TREE_PURPOSE (t
);
5295 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5297 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5298 /* Remove alias_decl from the weak list, but leave entries for
5299 the target alone. */
5301 #ifndef ASM_OUTPUT_WEAKREF
5302 else if (! TREE_SYMBOL_REFERENCED (target
))
5304 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5305 defined, otherwise we and weak_finish_1 would use
5306 different macros. */
5307 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5308 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5310 tree decl
= find_decl (target
);
5314 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5315 TREE_CODE (alias_decl
), target
,
5316 TREE_TYPE (alias_decl
));
5318 DECL_EXTERNAL (decl
) = 1;
5319 TREE_PUBLIC (decl
) = 1;
5320 DECL_ARTIFICIAL (decl
) = 1;
5321 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5322 TREE_USED (decl
) = 1;
5325 weak_finish_1 (decl
);
5334 /* Remove the alias and the target from the pending weak list
5335 so that we do not emit any .weak directives for the former,
5336 nor multiple .weak directives for the latter. */
5337 for (p
= &weak_decls
; (t2
= *p
) ; )
5339 if (TREE_VALUE (t2
) == alias_decl
5340 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5341 *p
= TREE_CHAIN (t2
);
5343 p
= &TREE_CHAIN (t2
);
5346 /* Remove other weakrefs to the same target, to speed things up. */
5347 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5349 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5350 *p
= TREE_CHAIN (t2
);
5352 p
= &TREE_CHAIN (t2
);
5357 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5359 tree decl
= TREE_VALUE (t
);
5361 weak_finish_1 (decl
);
5365 /* Emit the assembly bits to indicate that DECL is globally visible. */
5368 globalize_decl (tree decl
)
5371 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5372 if (DECL_WEAK (decl
))
5374 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5377 #ifdef ASM_WEAKEN_DECL
5378 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5380 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5383 /* Remove this function from the pending weak list so that
5384 we do not emit multiple .weak directives for it. */
5385 for (p
= &weak_decls
; (t
= *p
) ; )
5387 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5388 *p
= TREE_CHAIN (t
);
5390 p
= &TREE_CHAIN (t
);
5393 /* Remove weakrefs to the same target from the pending weakref
5394 list, for the same reason. */
5395 for (p
= &weakref_targets
; (t
= *p
) ; )
5397 if (DECL_ASSEMBLER_NAME (decl
)
5398 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5399 *p
= TREE_CHAIN (t
);
5401 p
= &TREE_CHAIN (t
);
5408 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5411 vec
<alias_pair
, va_gc
> *alias_pairs
;
5413 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5414 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5415 tree node is DECL to have the value of the tree node TARGET. */
5418 do_assemble_alias (tree decl
, tree target
)
5420 /* Emulated TLS had better not get this var. */
5421 gcc_assert(!(!targetm
.have_tls
5422 && TREE_CODE (decl
) == VAR_DECL
5423 && DECL_THREAD_LOCAL_P (decl
)));
5425 if (TREE_ASM_WRITTEN (decl
))
5428 /* We must force creation of DECL_RTL for debug info generation, even though
5429 we don't use it here. */
5430 make_decl_rtl (decl
);
5432 TREE_ASM_WRITTEN (decl
) = 1;
5433 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5435 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5437 ultimate_transparent_alias_target (&target
);
5439 if (!TREE_SYMBOL_REFERENCED (target
))
5440 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5442 #ifdef ASM_OUTPUT_WEAKREF
5443 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5444 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5445 IDENTIFIER_POINTER (target
));
5447 if (!TARGET_SUPPORTS_WEAK
)
5449 error_at (DECL_SOURCE_LOCATION (decl
),
5450 "weakref is not supported in this configuration");
5457 #ifdef ASM_OUTPUT_DEF
5458 /* Make name accessible from other files, if appropriate. */
5460 if (TREE_PUBLIC (decl
))
5462 globalize_decl (decl
);
5463 maybe_assemble_visibility (decl
);
5465 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5467 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE) && HAVE_GNU_INDIRECT_FUNCTION
5468 ASM_OUTPUT_TYPE_DIRECTIVE
5469 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5472 error_at (DECL_SOURCE_LOCATION (decl
),
5473 "ifunc is not supported in this configuration");
5477 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5478 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5480 ASM_OUTPUT_DEF (asm_out_file
,
5481 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5482 IDENTIFIER_POINTER (target
));
5484 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5489 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5490 # ifdef ASM_WEAKEN_DECL
5491 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5493 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5495 /* Remove this function from the pending weak list so that
5496 we do not emit multiple .weak directives for it. */
5497 for (p
= &weak_decls
; (t
= *p
) ; )
5498 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5499 *p
= TREE_CHAIN (t
);
5501 p
= &TREE_CHAIN (t
);
5503 /* Remove weakrefs to the same target from the pending weakref
5504 list, for the same reason. */
5505 for (p
= &weakref_targets
; (t
= *p
) ; )
5507 if (DECL_ASSEMBLER_NAME (decl
)
5508 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5509 *p
= TREE_CHAIN (t
);
5511 p
= &TREE_CHAIN (t
);
5517 /* Emit an assembler directive to make the symbol for DECL an alias to
5518 the symbol for TARGET. */
5521 assemble_alias (tree decl
, tree target
)
5525 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5527 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5529 ultimate_transparent_alias_target (&target
);
5531 if (alias
== target
)
5532 error ("weakref %q+D ultimately targets itself", decl
);
5535 #ifndef ASM_OUTPUT_WEAKREF
5536 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5537 TREE_CHAIN (alias
) = target
;
5540 if (TREE_PUBLIC (decl
))
5541 error ("weakref %q+D must have static linkage", decl
);
5545 #if !defined (ASM_OUTPUT_DEF)
5546 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5547 error_at (DECL_SOURCE_LOCATION (decl
),
5548 "alias definitions not supported in this configuration");
5551 if (!DECL_WEAK (decl
))
5553 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5554 error_at (DECL_SOURCE_LOCATION (decl
),
5555 "ifunc is not supported in this configuration");
5557 error_at (DECL_SOURCE_LOCATION (decl
),
5558 "only weak aliases are supported in this configuration");
5564 TREE_USED (decl
) = 1;
5566 /* Allow aliases to aliases. */
5567 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5568 cgraph_get_create_node (decl
)->alias
= true;
5570 varpool_node_for_decl (decl
)->alias
= true;
5572 /* If the target has already been emitted, we don't have to queue the
5573 alias. This saves a tad of memory. */
5574 if (cgraph_global_info_ready
)
5575 target_decl
= find_decl (target
);
5578 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5579 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5580 do_assemble_alias (decl
, target
);
5583 alias_pair p
= {decl
, target
};
5584 vec_safe_push (alias_pairs
, p
);
5588 /* Record and output a table of translations from original function
5589 to its transaction aware clone. Note that tm_pure functions are
5590 considered to be their own clone. */
5592 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5593 htab_t tm_clone_hash
;
5596 record_tm_clone_pair (tree o
, tree n
)
5598 struct tree_map
**slot
, *h
;
5600 if (tm_clone_hash
== NULL
)
5601 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5603 h
= ggc_alloc_tree_map ();
5604 h
->hash
= htab_hash_pointer (o
);
5608 slot
= (struct tree_map
**)
5609 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5614 get_tm_clone_pair (tree o
)
5618 struct tree_map
*h
, in
;
5621 in
.hash
= htab_hash_pointer (o
);
5622 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5630 typedef struct tm_alias_pair
5638 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5639 into a VEC in INFO. */
5642 dump_tm_clone_to_vec (void **slot
, void *info
)
5644 struct tree_map
*map
= (struct tree_map
*) *slot
;
5645 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5646 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5647 tm_alias_pairs
->safe_push (p
);
5651 /* Dump the actual pairs to the .tm_clone_table section. */
5654 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5658 bool switched
= false;
5660 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5664 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5665 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5667 /* The function ipa_tm_create_version() marks the clone as needed if
5668 the original function was needed. But we also mark the clone as
5669 needed if we ever called the clone indirectly through
5670 TM_GETTMCLONE. If neither of these are true, we didn't generate
5671 a clone, and we didn't call it indirectly... no sense keeping it
5672 in the clone table. */
5673 if (!dst_n
|| !dst_n
->analyzed
)
5676 /* This covers the case where we have optimized the original
5677 function away, and only access the transactional clone. */
5678 if (!src_n
|| !src_n
->analyzed
)
5683 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5684 assemble_align (POINTER_SIZE
);
5688 assemble_integer (XEXP (DECL_RTL (src
), 0),
5689 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5690 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5691 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5695 /* Provide a default for the tm_clone_table section. */
5698 default_clone_table_section (void)
5700 return get_named_section (NULL
, ".tm_clone_table", 3);
5703 /* Helper comparison function for qsorting by the DECL_UID stored in
5704 alias_pair->emitted_diags. */
5707 tm_alias_pair_cmp (const void *x
, const void *y
)
5709 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5710 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5711 if (p1
->uid
< p2
->uid
)
5713 if (p1
->uid
> p2
->uid
)
5719 finish_tm_clone_pairs (void)
5721 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5723 if (tm_clone_hash
== NULL
)
5726 /* We need a determenistic order for the .tm_clone_table, otherwise
5727 we will get bootstrap comparison failures, so dump the hash table
5728 to a vector, sort it, and dump the vector. */
5730 /* Dump the hashtable to a vector. */
5731 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5732 (void *) &tm_alias_pairs
);
5734 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5737 dump_tm_clone_pairs (tm_alias_pairs
);
5739 htab_delete (tm_clone_hash
);
5740 tm_clone_hash
= NULL
;
5741 tm_alias_pairs
.release ();
5745 /* Emit an assembler directive to set symbol for DECL visibility to
5746 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5749 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5750 int vis ATTRIBUTE_UNUSED
)
5752 #ifdef HAVE_GAS_HIDDEN
5753 static const char * const visibility_types
[] = {
5754 NULL
, "protected", "hidden", "internal"
5757 const char *name
, *type
;
5759 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5760 type
= visibility_types
[vis
];
5762 fprintf (asm_out_file
, "\t.%s\t", type
);
5763 assemble_name (asm_out_file
, name
);
5764 fprintf (asm_out_file
, "\n");
5766 warning (OPT_Wattributes
, "visibility attribute not supported "
5767 "in this configuration; ignored");
5771 /* A helper function to call assemble_visibility when needed for a decl. */
5774 maybe_assemble_visibility (tree decl
)
5776 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5778 if (vis
!= VISIBILITY_DEFAULT
)
5780 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5787 /* Returns 1 if the target configuration supports defining public symbols
5788 so that one of them will be chosen at link time instead of generating a
5789 multiply-defined symbol error, whether through the use of weak symbols or
5790 a target-specific mechanism for having duplicates discarded. */
5793 supports_one_only (void)
5795 if (SUPPORTS_ONE_ONLY
)
5797 return TARGET_SUPPORTS_WEAK
;
5800 /* Set up DECL as a public symbol that can be defined in multiple
5801 translation units without generating a linker error. */
5804 make_decl_one_only (tree decl
, tree comdat_group
)
5806 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5807 || TREE_CODE (decl
) == FUNCTION_DECL
);
5809 TREE_PUBLIC (decl
) = 1;
5811 if (SUPPORTS_ONE_ONLY
)
5813 #ifdef MAKE_DECL_ONE_ONLY
5814 MAKE_DECL_ONE_ONLY (decl
);
5816 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5818 else if (TREE_CODE (decl
) == VAR_DECL
5819 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5820 DECL_COMMON (decl
) = 1;
5823 gcc_assert (TARGET_SUPPORTS_WEAK
);
5824 DECL_WEAK (decl
) = 1;
5829 init_varasm_once (void)
5831 section_htab
= htab_create_ggc (31, section_entry_hash
,
5832 section_entry_eq
, NULL
);
5833 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5834 object_block_entry_eq
, NULL
);
5835 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5836 const_desc_eq
, NULL
);
5838 const_alias_set
= new_alias_set ();
5839 shared_constant_pool
= create_constant_pool ();
5841 #ifdef TEXT_SECTION_ASM_OP
5842 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5843 TEXT_SECTION_ASM_OP
);
5846 #ifdef DATA_SECTION_ASM_OP
5847 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5848 DATA_SECTION_ASM_OP
);
5851 #ifdef SDATA_SECTION_ASM_OP
5852 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5853 SDATA_SECTION_ASM_OP
);
5856 #ifdef READONLY_DATA_SECTION_ASM_OP
5857 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5858 READONLY_DATA_SECTION_ASM_OP
);
5861 #ifdef CTORS_SECTION_ASM_OP
5862 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5863 CTORS_SECTION_ASM_OP
);
5866 #ifdef DTORS_SECTION_ASM_OP
5867 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5868 DTORS_SECTION_ASM_OP
);
5871 #ifdef BSS_SECTION_ASM_OP
5872 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5873 output_section_asm_op
,
5874 BSS_SECTION_ASM_OP
);
5877 #ifdef SBSS_SECTION_ASM_OP
5878 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5879 output_section_asm_op
,
5880 SBSS_SECTION_ASM_OP
);
5883 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5884 | SECTION_COMMON
, emit_tls_common
);
5885 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5886 | SECTION_COMMON
, emit_local
);
5887 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5888 | SECTION_COMMON
, emit_common
);
5890 #if defined ASM_OUTPUT_ALIGNED_BSS
5891 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5895 targetm
.asm_out
.init_sections ();
5897 if (readonly_data_section
== NULL
)
5898 readonly_data_section
= text_section
;
5902 decl_default_tls_model (const_tree decl
)
5904 enum tls_model kind
;
5907 is_local
= targetm
.binds_local_p (decl
);
5911 kind
= TLS_MODEL_LOCAL_EXEC
;
5913 kind
= TLS_MODEL_INITIAL_EXEC
;
5916 /* Local dynamic is inefficient when we're not combining the
5917 parts of the address. */
5918 else if (optimize
&& is_local
)
5919 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5921 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5922 if (kind
< flag_tls_default
)
5923 kind
= flag_tls_default
;
5928 /* Select a set of attributes for section NAME based on the properties
5929 of DECL and whether or not RELOC indicates that DECL's initializer
5930 might contain runtime relocations.
5932 We make the section read-only and executable for a function decl,
5933 read-only for a const data decl, and writable for a non-const data decl. */
5936 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5940 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5941 flags
= SECTION_CODE
;
5944 enum section_category category
5945 = categorize_decl_for_section (decl
, reloc
);
5946 if (decl_readonly_section_1 (category
))
5948 else if (category
== SECCAT_DATA_REL_RO
5949 || category
== SECCAT_DATA_REL_RO_LOCAL
)
5950 flags
= SECTION_WRITE
| SECTION_RELRO
;
5952 flags
= SECTION_WRITE
;
5956 flags
= SECTION_WRITE
;
5957 if (strcmp (name
, ".data.rel.ro") == 0
5958 || strcmp (name
, ".data.rel.ro.local") == 0)
5959 flags
|= SECTION_RELRO
;
5962 if (decl
&& DECL_ONE_ONLY (decl
))
5963 flags
|= SECTION_LINKONCE
;
5965 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5966 flags
|= SECTION_TLS
| SECTION_WRITE
;
5968 if (strcmp (name
, ".bss") == 0
5969 || strncmp (name
, ".bss.", 5) == 0
5970 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
5971 || strcmp (name
, ".sbss") == 0
5972 || strncmp (name
, ".sbss.", 6) == 0
5973 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
5974 flags
|= SECTION_BSS
;
5976 if (strcmp (name
, ".tdata") == 0
5977 || strncmp (name
, ".tdata.", 7) == 0
5978 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
5979 flags
|= SECTION_TLS
;
5981 if (strcmp (name
, ".tbss") == 0
5982 || strncmp (name
, ".tbss.", 6) == 0
5983 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
5984 flags
|= SECTION_TLS
| SECTION_BSS
;
5986 /* These three sections have special ELF types. They are neither
5987 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5988 want to print a section type (@progbits or @nobits). If someone
5989 is silly enough to emit code or TLS variables to one of these
5990 sections, then don't handle them specially. */
5991 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
5992 && (strcmp (name
, ".init_array") == 0
5993 || strcmp (name
, ".fini_array") == 0
5994 || strcmp (name
, ".preinit_array") == 0))
5995 flags
|= SECTION_NOTYPE
;
6000 /* Return true if the target supports some form of global BSS,
6001 either through bss_noswitch_section, or by selecting a BSS
6002 section in TARGET_ASM_SELECT_SECTION. */
6005 have_global_bss_p (void)
6007 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6010 /* Output assembly to switch to section NAME with attribute FLAGS.
6011 Four variants for common object file formats. */
6014 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6015 unsigned int flags ATTRIBUTE_UNUSED
,
6016 tree decl ATTRIBUTE_UNUSED
)
6018 /* Some object formats don't support named sections at all. The
6019 front-end should already have flagged this as an error. */
6023 #ifndef TLS_SECTION_ASM_FLAG
6024 #define TLS_SECTION_ASM_FLAG 'T'
6028 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6029 tree decl ATTRIBUTE_UNUSED
)
6031 char flagchars
[10], *f
= flagchars
;
6033 /* If we have already declared this section, we can use an
6034 abbreviated form to switch back to it -- unless this section is
6035 part of a COMDAT groups, in which case GAS requires the full
6036 declaration every time. */
6037 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6038 && (flags
& SECTION_DECLARED
))
6040 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6044 if (!(flags
& SECTION_DEBUG
))
6046 if (flags
& SECTION_EXCLUDE
)
6048 if (flags
& SECTION_WRITE
)
6050 if (flags
& SECTION_CODE
)
6052 if (flags
& SECTION_SMALL
)
6054 if (flags
& SECTION_MERGE
)
6056 if (flags
& SECTION_STRINGS
)
6058 if (flags
& SECTION_TLS
)
6059 *f
++ = TLS_SECTION_ASM_FLAG
;
6060 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6064 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6066 if (!(flags
& SECTION_NOTYPE
))
6071 if (flags
& SECTION_BSS
)
6077 /* On platforms that use "@" as the assembly comment character,
6079 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6081 fprintf (asm_out_file
, format
, type
);
6083 if (flags
& SECTION_ENTSIZE
)
6084 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6085 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6087 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6088 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6090 fprintf (asm_out_file
, ",%s,comdat",
6091 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6095 putc ('\n', asm_out_file
);
6099 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6100 tree decl ATTRIBUTE_UNUSED
)
6102 char flagchars
[8], *f
= flagchars
;
6104 if (flags
& SECTION_WRITE
)
6106 if (flags
& SECTION_CODE
)
6110 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6114 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6117 default_coff_asm_named_section (name
, flags
, decl
);
6119 if (flags
& SECTION_LINKONCE
)
6121 /* Functions may have been compiled at various levels of
6122 optimization so we can't use `same_size' here.
6123 Instead, have the linker pick one. */
6124 fprintf (asm_out_file
, "\t.linkonce %s\n",
6125 (flags
& SECTION_CODE
? "discard" : "same_size"));
6129 /* The lame default section selector. */
6132 default_select_section (tree decl
, int reloc
,
6133 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6137 if (decl_readonly_section (decl
, reloc
))
6138 return readonly_data_section
;
6140 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6142 if (! ((flag_pic
&& reloc
)
6143 || !TREE_READONLY (decl
)
6144 || TREE_SIDE_EFFECTS (decl
)
6145 || !TREE_CONSTANT (decl
)))
6146 return readonly_data_section
;
6148 else if (TREE_CODE (decl
) == STRING_CST
)
6149 return readonly_data_section
;
6150 else if (! (flag_pic
&& reloc
))
6151 return readonly_data_section
;
6153 return data_section
;
6156 enum section_category
6157 categorize_decl_for_section (const_tree decl
, int reloc
)
6159 enum section_category ret
;
6161 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6163 else if (TREE_CODE (decl
) == STRING_CST
)
6165 if (flag_mudflap
) /* or !flag_merge_constants */
6166 return SECCAT_RODATA
;
6168 return SECCAT_RODATA_MERGE_STR
;
6170 else if (TREE_CODE (decl
) == VAR_DECL
)
6172 if (bss_initializer_p (decl
))
6174 else if (! TREE_READONLY (decl
)
6175 || TREE_SIDE_EFFECTS (decl
)
6176 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6178 /* Here the reloc_rw_mask is not testing whether the section should
6179 be read-only or not, but whether the dynamic link will have to
6180 do something. If so, we wish to segregate the data in order to
6181 minimize cache misses inside the dynamic linker. */
6182 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6183 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6187 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6188 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6189 else if (reloc
|| flag_merge_constants
< 2)
6190 /* C and C++ don't allow different variables to share the same
6191 location. -fmerge-all-constants allows even that (at the
6192 expense of not conforming). */
6193 ret
= SECCAT_RODATA
;
6194 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6195 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6197 ret
= SECCAT_RODATA_MERGE_CONST
;
6199 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6201 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6202 || TREE_SIDE_EFFECTS (decl
)
6203 || ! TREE_CONSTANT (decl
))
6206 ret
= SECCAT_RODATA
;
6209 ret
= SECCAT_RODATA
;
6211 /* There are no read-only thread-local sections. */
6212 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6214 /* Note that this would be *just* SECCAT_BSS, except that there's
6215 no concept of a read-only thread-local-data section. */
6216 if (ret
== SECCAT_BSS
6217 || (flag_zero_initialized_in_bss
6218 && initializer_zerop (DECL_INITIAL (decl
))))
6224 /* If the target uses small data sections, select it. */
6225 else if (targetm
.in_small_data_p (decl
))
6227 if (ret
== SECCAT_BSS
)
6229 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6230 ret
= SECCAT_SRODATA
;
6239 decl_readonly_section_1 (enum section_category category
)
6244 case SECCAT_RODATA_MERGE_STR
:
6245 case SECCAT_RODATA_MERGE_STR_INIT
:
6246 case SECCAT_RODATA_MERGE_CONST
:
6247 case SECCAT_SRODATA
:
6255 decl_readonly_section (const_tree decl
, int reloc
)
6257 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6260 /* Select a section based on the above categorization. */
6263 default_elf_select_section (tree decl
, int reloc
,
6264 unsigned HOST_WIDE_INT align
)
6267 switch (categorize_decl_for_section (decl
, reloc
))
6270 /* We're not supposed to be called on FUNCTION_DECLs. */
6273 return readonly_data_section
;
6274 case SECCAT_RODATA_MERGE_STR
:
6275 return mergeable_string_section (decl
, align
, 0);
6276 case SECCAT_RODATA_MERGE_STR_INIT
:
6277 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6278 case SECCAT_RODATA_MERGE_CONST
:
6279 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6280 case SECCAT_SRODATA
:
6284 return data_section
;
6285 case SECCAT_DATA_REL
:
6286 sname
= ".data.rel";
6288 case SECCAT_DATA_REL_LOCAL
:
6289 sname
= ".data.rel.local";
6291 case SECCAT_DATA_REL_RO
:
6292 sname
= ".data.rel.ro";
6294 case SECCAT_DATA_REL_RO_LOCAL
:
6295 sname
= ".data.rel.ro.local";
6320 return get_named_section (decl
, sname
, reloc
);
6323 /* Construct a unique section name based on the decl name and the
6324 categorization performed above. */
6327 default_unique_section (tree decl
, int reloc
)
6329 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6330 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6331 const char *prefix
, *name
, *linkonce
;
6334 switch (categorize_decl_for_section (decl
, reloc
))
6337 prefix
= one_only
? ".t" : ".text";
6340 case SECCAT_RODATA_MERGE_STR
:
6341 case SECCAT_RODATA_MERGE_STR_INIT
:
6342 case SECCAT_RODATA_MERGE_CONST
:
6343 prefix
= one_only
? ".r" : ".rodata";
6345 case SECCAT_SRODATA
:
6346 prefix
= one_only
? ".s2" : ".sdata2";
6349 prefix
= one_only
? ".d" : ".data";
6351 case SECCAT_DATA_REL
:
6352 prefix
= one_only
? ".d.rel" : ".data.rel";
6354 case SECCAT_DATA_REL_LOCAL
:
6355 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6357 case SECCAT_DATA_REL_RO
:
6358 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6360 case SECCAT_DATA_REL_RO_LOCAL
:
6361 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6364 prefix
= one_only
? ".s" : ".sdata";
6367 prefix
= one_only
? ".b" : ".bss";
6370 prefix
= one_only
? ".sb" : ".sbss";
6373 prefix
= one_only
? ".td" : ".tdata";
6376 prefix
= one_only
? ".tb" : ".tbss";
6382 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6383 name
= targetm
.strip_name_encoding (name
);
6385 /* If we're using one_only, then there needs to be a .gnu.linkonce
6386 prefix to the section name. */
6387 linkonce
= one_only
? ".gnu.linkonce" : "";
6389 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6391 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6394 /* Like compute_reloc_for_constant, except for an RTX. The return value
6395 is a mask for which bit 1 indicates a global relocation, and bit 0
6396 indicates a local relocation. */
6399 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6401 int *preloc
= (int *) data
;
6404 switch (GET_CODE (x
))
6407 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6420 compute_reloc_for_rtx (rtx x
)
6424 switch (GET_CODE (x
))
6430 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6439 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6441 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6443 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6444 return data_section
;
6446 return readonly_data_section
;
6450 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6451 unsigned HOST_WIDE_INT align
)
6453 int reloc
= compute_reloc_for_rtx (x
);
6455 /* ??? Handle small data here somehow. */
6457 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6460 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6462 return get_named_section (NULL
, ".data.rel.ro", 3);
6465 return mergeable_constant_section (mode
, align
, 0);
6468 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6471 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6476 /* Careful not to prod global register variables. */
6479 symbol
= XEXP (rtl
, 0);
6480 if (GET_CODE (symbol
) != SYMBOL_REF
)
6483 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6484 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6485 flags
|= SYMBOL_FLAG_FUNCTION
;
6486 if (targetm
.binds_local_p (decl
))
6487 flags
|= SYMBOL_FLAG_LOCAL
;
6488 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6489 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6490 else if (targetm
.in_small_data_p (decl
))
6491 flags
|= SYMBOL_FLAG_SMALL
;
6492 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6493 being PUBLIC, the thing *must* be defined in this translation unit.
6494 Prevent this buglet from being propagated into rtl code as well. */
6495 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6496 flags
|= SYMBOL_FLAG_EXTERNAL
;
6498 SYMBOL_REF_FLAGS (symbol
) = flags
;
6501 /* By default, we do nothing for encode_section_info, so we need not
6502 do anything but discard the '*' marker. */
6505 default_strip_name_encoding (const char *str
)
6507 return str
+ (*str
== '*');
6510 #ifdef ASM_OUTPUT_DEF
6511 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6512 anchor relative to ".", the current section position. */
6515 default_asm_output_anchor (rtx symbol
)
6519 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6520 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6521 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6525 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6528 default_use_anchors_for_symbol_p (const_rtx symbol
)
6533 /* Don't use anchors for mergeable sections. The linker might move
6534 the objects around. */
6535 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6536 if (sect
->common
.flags
& SECTION_MERGE
)
6539 /* Don't use anchors for small data sections. The small data register
6540 acts as an anchor for such sections. */
6541 if (sect
->common
.flags
& SECTION_SMALL
)
6544 decl
= SYMBOL_REF_DECL (symbol
);
6545 if (decl
&& DECL_P (decl
))
6547 /* Don't use section anchors for decls that might be defined by
6549 if (!targetm
.binds_local_p (decl
))
6552 /* Don't use section anchors for decls that will be placed in a
6553 small data section. */
6554 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6555 one above. The problem is that we only use SECTION_SMALL for
6556 sections that should be marked as small in the section directive. */
6557 if (targetm
.in_small_data_p (decl
))
6563 /* Return true when RESOLUTION indicate that symbol will be bound to the
6564 definition provided by current .o file. */
6567 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6569 return (resolution
== LDPR_PREVAILING_DEF
6570 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6571 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6574 /* Return true when RESOLUTION indicate that symbol will be bound locally
6575 within current executable or DSO. */
6578 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6580 return (resolution
== LDPR_PREVAILING_DEF
6581 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6582 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6583 || resolution
== LDPR_PREEMPTED_REG
6584 || resolution
== LDPR_PREEMPTED_IR
6585 || resolution
== LDPR_RESOLVED_IR
6586 || resolution
== LDPR_RESOLVED_EXEC
);
6589 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6590 wrt cross-module name binding. */
6593 default_binds_local_p (const_tree exp
)
6595 return default_binds_local_p_1 (exp
, flag_shlib
);
6599 default_binds_local_p_1 (const_tree exp
, int shlib
)
6602 bool resolved_locally
= false;
6603 bool resolved_to_local_def
= false;
6605 /* With resolution file in hands, take look into resolutions.
6606 We can't just return true for resolved_locally symbols,
6607 because dynamic linking might overwrite symbols
6608 in shared libraries. */
6609 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6610 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6612 struct varpool_node
*vnode
= varpool_get_node (exp
);
6613 if (vnode
&& resolution_local_p (vnode
->symbol
.resolution
))
6614 resolved_locally
= true;
6616 && resolution_to_local_definition_p (vnode
->symbol
.resolution
))
6617 resolved_to_local_def
= true;
6619 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6621 struct cgraph_node
*node
= cgraph_get_node (exp
);
6623 && resolution_local_p (node
->symbol
.resolution
))
6624 resolved_locally
= true;
6626 && resolution_to_local_definition_p (node
->symbol
.resolution
))
6627 resolved_to_local_def
= true;
6630 /* A non-decl is an entry in the constant pool. */
6633 /* Weakrefs may not bind locally, even though the weakref itself is always
6634 static and therefore local. Similarly, the resolver for ifunc functions
6635 might resolve to a non-local function.
6636 FIXME: We can resolve the weakref case more curefuly by looking at the
6638 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6639 || (TREE_CODE (exp
) == FUNCTION_DECL
6640 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6642 /* Static variables are always local. */
6643 else if (! TREE_PUBLIC (exp
))
6645 /* A variable is local if the user has said explicitly that it will
6647 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6648 || resolved_to_local_def
)
6649 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6651 /* Variables defined outside this object might not be local. */
6652 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6654 /* If defined in this object and visibility is not default, must be
6656 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6658 /* Default visibility weak data can be overridden by a strong symbol
6659 in another module and so are not local. */
6660 else if (DECL_WEAK (exp
)
6661 && !resolved_locally
)
6663 /* If PIC, then assume that any global name can be overridden by
6664 symbols resolved from other modules. */
6667 /* Uninitialized COMMON variable may be unified with symbols
6668 resolved from other modules. */
6669 else if (DECL_COMMON (exp
)
6670 && !resolved_locally
6671 && (DECL_INITIAL (exp
) == NULL
6672 || DECL_INITIAL (exp
) == error_mark_node
))
6674 /* Otherwise we're left with initialized (or non-common) global data
6675 which is of necessity defined locally. */
6682 /* Return true when references to DECL must bind to current definition in
6685 The condition is usually equivalent to whether the function binds to the
6686 current module (shared library or executable), that is to binds_local_p.
6687 We use this fact to avoid need for another target hook and implement
6688 the logic using binds_local_p and just special cases where
6689 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6690 the weak definitions (that can be overwritten at linktime by other
6691 definition from different object file) and when resolution info is available
6692 we simply use the knowledge passed to us by linker plugin. */
6694 decl_binds_to_current_def_p (tree decl
)
6696 gcc_assert (DECL_P (decl
));
6697 if (!TREE_PUBLIC (decl
))
6699 if (!targetm
.binds_local_p (decl
))
6701 /* When resolution is available, just use it. */
6702 if (TREE_CODE (decl
) == VAR_DECL
6703 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6705 struct varpool_node
*vnode
= varpool_get_node (decl
);
6707 && vnode
->symbol
.resolution
!= LDPR_UNKNOWN
)
6708 return resolution_to_local_definition_p (vnode
->symbol
.resolution
);
6710 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6712 struct cgraph_node
*node
= cgraph_get_node (decl
);
6714 && node
->symbol
.resolution
!= LDPR_UNKNOWN
)
6715 return resolution_to_local_definition_p (node
->symbol
.resolution
);
6717 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6718 binds locally but still can be overwritten).
6719 This rely on fact that binds_local_p behave as decl_replaceable_p
6720 for all other declaration types. */
6721 return !DECL_WEAK (decl
);
6724 /* A replaceable function or variable is one which may be replaced
6725 at link-time with an entirely different definition, provided that the
6726 replacement has the same type. For example, functions declared
6727 with __attribute__((weak)) on most systems are replaceable.
6729 COMDAT functions are not replaceable, since all definitions of the
6730 function must be equivalent. It is important that COMDAT functions
6731 not be treated as replaceable so that use of C++ template
6732 instantiations is not penalized. */
6735 decl_replaceable_p (tree decl
)
6737 gcc_assert (DECL_P (decl
));
6738 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6740 return !decl_binds_to_current_def_p (decl
);
6743 /* Default function to output code that will globalize a label. A
6744 target must define GLOBAL_ASM_OP or provide its own function to
6745 globalize a label. */
6746 #ifdef GLOBAL_ASM_OP
6748 default_globalize_label (FILE * stream
, const char *name
)
6750 fputs (GLOBAL_ASM_OP
, stream
);
6751 assemble_name (stream
, name
);
6752 putc ('\n', stream
);
6754 #endif /* GLOBAL_ASM_OP */
6756 /* Default function to output code that will globalize a declaration. */
6758 default_globalize_decl_name (FILE * stream
, tree decl
)
6760 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6761 targetm
.asm_out
.globalize_label (stream
, name
);
6764 /* Default function to output a label for unwind information. The
6765 default is to do nothing. A target that needs nonlocal labels for
6766 unwind information must provide its own function to do this. */
6768 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6769 tree decl ATTRIBUTE_UNUSED
,
6770 int for_eh ATTRIBUTE_UNUSED
,
6771 int empty ATTRIBUTE_UNUSED
)
6775 /* Default function to output a label to divide up the exception table.
6776 The default is to do nothing. A target that needs/wants to divide
6777 up the table must provide it's own function to do this. */
6779 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6783 /* This is how to output an internal numbered label where PREFIX is
6784 the class of label and LABELNO is the number within the class. */
6787 default_generate_internal_label (char *buf
, const char *prefix
,
6788 unsigned long labelno
)
6790 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6793 /* This is how to output an internal numbered label where PREFIX is
6794 the class of label and LABELNO is the number within the class. */
6797 default_internal_label (FILE *stream
, const char *prefix
,
6798 unsigned long labelno
)
6800 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6801 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6802 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6806 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6809 default_asm_declare_constant_name (FILE *file
, const char *name
,
6810 const_tree exp ATTRIBUTE_UNUSED
,
6811 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6813 assemble_label (file
, name
);
6816 /* This is the default behavior at the beginning of a file. It's
6817 controlled by two other target-hook toggles. */
6819 default_file_start (void)
6821 if (targetm
.asm_file_start_app_off
6822 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6823 fputs (ASM_APP_OFF
, asm_out_file
);
6825 if (targetm
.asm_file_start_file_directive
)
6826 output_file_directive (asm_out_file
, main_input_filename
);
6829 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6830 which emits a special section directive used to indicate whether or
6831 not this object file needs an executable stack. This is primarily
6832 a GNU extension to ELF but could be used on other targets. */
6834 int trampolines_created
;
6837 file_end_indicate_exec_stack (void)
6839 unsigned int flags
= SECTION_DEBUG
;
6840 if (trampolines_created
)
6841 flags
|= SECTION_CODE
;
6843 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6846 /* Emit a special section directive to indicate that this object file
6847 was compiled with -fsplit-stack. This is used to let the linker
6848 detect calls between split-stack code and non-split-stack code, so
6849 that it can modify the split-stack code to allocate a sufficiently
6850 large stack. We emit another special section if there are any
6851 functions in this file which have the no_split_stack attribute, to
6852 prevent the linker from warning about being unable to convert the
6853 functions if they call non-split-stack code. */
6856 file_end_indicate_split_stack (void)
6858 if (flag_split_stack
)
6860 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6862 if (saw_no_split_stack
)
6863 switch_to_section (get_section (".note.GNU-no-split-stack",
6864 SECTION_DEBUG
, NULL
));
6868 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6869 a get_unnamed_section callback. */
6872 output_section_asm_op (const void *directive
)
6874 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6877 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6878 the current section is NEW_SECTION. */
6881 switch_to_section (section
*new_section
)
6883 if (in_section
== new_section
)
6886 if (new_section
->common
.flags
& SECTION_FORGET
)
6889 in_section
= new_section
;
6891 switch (SECTION_STYLE (new_section
))
6894 targetm
.asm_out
.named_section (new_section
->named
.name
,
6895 new_section
->named
.common
.flags
,
6896 new_section
->named
.decl
);
6899 case SECTION_UNNAMED
:
6900 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6903 case SECTION_NOSWITCH
:
6908 new_section
->common
.flags
|= SECTION_DECLARED
;
6911 /* If block symbol SYMBOL has not yet been assigned an offset, place
6912 it at the end of its block. */
6915 place_block_symbol (rtx symbol
)
6917 unsigned HOST_WIDE_INT size
, mask
, offset
;
6918 struct constant_descriptor_rtx
*desc
;
6919 unsigned int alignment
;
6920 struct object_block
*block
;
6923 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6924 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6927 /* Work out the symbol's size and alignment. */
6928 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6930 desc
= SYMBOL_REF_CONSTANT (symbol
);
6931 alignment
= desc
->align
;
6932 size
= GET_MODE_SIZE (desc
->mode
);
6934 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6936 decl
= SYMBOL_REF_DECL (symbol
);
6937 alignment
= DECL_ALIGN (decl
);
6938 size
= get_constant_size (DECL_INITIAL (decl
));
6942 decl
= SYMBOL_REF_DECL (symbol
);
6943 alignment
= DECL_ALIGN (decl
);
6944 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6945 if (flag_asan
&& asan_protect_global (decl
))
6946 size
+= asan_red_zone_size (size
);
6949 /* Calculate the object's offset from the start of the block. */
6950 block
= SYMBOL_REF_BLOCK (symbol
);
6951 mask
= alignment
/ BITS_PER_UNIT
- 1;
6952 offset
= (block
->size
+ mask
) & ~mask
;
6953 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6955 /* Record the block's new alignment and size. */
6956 block
->alignment
= MAX (block
->alignment
, alignment
);
6957 block
->size
= offset
+ size
;
6959 vec_safe_push (block
->objects
, symbol
);
6962 /* Return the anchor that should be used to address byte offset OFFSET
6963 from the first object in BLOCK. MODEL is the TLS model used
6967 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
6968 enum tls_model model
)
6971 unsigned int begin
, middle
, end
;
6972 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
6975 /* Work out the anchor's offset. Use an offset of 0 for the first
6976 anchor so that we don't pessimize the case where we take the address
6977 of a variable at the beginning of the block. This is particularly
6978 useful when a block has only one variable assigned to it.
6980 We try to place anchors RANGE bytes apart, so there can then be
6981 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6982 a ptr_mode offset. With some target settings, the lowest such
6983 anchor might be out of range for the lowest ptr_mode offset;
6984 likewise the highest anchor for the highest offset. Use anchors
6985 at the extreme ends of the ptr_mode range in such cases.
6987 All arithmetic uses unsigned integers in order to avoid
6989 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
6990 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
6991 range
= max_offset
- min_offset
+ 1;
6996 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
6999 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7000 delta
-= delta
% range
;
7003 offset
= (HOST_WIDE_INT
) (-delta
);
7007 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7008 delta
-= delta
% range
;
7009 if (delta
> bias
- 1)
7011 offset
= (HOST_WIDE_INT
) delta
;
7015 /* Do a binary search to see if there's already an anchor we can use.
7016 Set BEGIN to the new anchor's index if not. */
7018 end
= vec_safe_length (block
->anchors
);
7019 while (begin
!= end
)
7021 middle
= (end
+ begin
) / 2;
7022 anchor
= (*block
->anchors
)[middle
];
7023 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7025 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7027 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7029 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7035 /* Create a new anchor with a unique label. */
7036 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7037 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7038 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7039 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7041 /* Insert it at index BEGIN. */
7042 vec_safe_insert (block
->anchors
, begin
, anchor
);
7046 /* Output the objects in BLOCK. */
7049 output_object_block (struct object_block
*block
)
7051 struct constant_descriptor_rtx
*desc
;
7053 HOST_WIDE_INT offset
;
7057 if (!block
->objects
)
7060 /* Switch to the section and make sure that the first byte is
7061 suitably aligned. */
7062 switch_to_section (block
->sect
);
7063 assemble_align (block
->alignment
);
7065 /* Define the values of all anchors relative to the current section
7067 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7068 targetm
.asm_out
.output_anchor (symbol
);
7070 /* Output the objects themselves. */
7072 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7074 /* Move to the object's offset, padding with zeros if necessary. */
7075 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7076 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7077 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7079 desc
= SYMBOL_REF_CONSTANT (symbol
);
7080 output_constant_pool_1 (desc
, 1);
7081 offset
+= GET_MODE_SIZE (desc
->mode
);
7083 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7085 decl
= SYMBOL_REF_DECL (symbol
);
7086 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7088 offset
+= get_constant_size (DECL_INITIAL (decl
));
7092 decl
= SYMBOL_REF_DECL (symbol
);
7093 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7094 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7099 /* A htab_traverse callback used to call output_object_block for
7100 each member of object_block_htab. */
7103 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7105 output_object_block ((struct object_block
*) (*slot
));
7109 /* Output the definitions of all object_blocks. */
7112 output_object_blocks (void)
7114 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7117 /* This function provides a possible implementation of the
7118 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7119 by -frecord-gcc-switches it creates a new mergeable, string section in the
7120 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7121 contains the switches in ASCII format.
7123 FIXME: This code does not correctly handle double quote characters
7124 that appear inside strings, (it strips them rather than preserving them).
7125 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7126 characters - instead it treats them as sub-string separators. Since
7127 we want to emit NUL strings terminators into the object file we have to use
7131 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7135 case SWITCH_TYPE_PASSED
:
7136 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7137 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7140 case SWITCH_TYPE_DESCRIPTIVE
:
7143 /* Distinguish between invocations where name is NULL. */
7144 static bool started
= false;
7150 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7154 | (SECTION_ENTSIZE
& 1),
7156 switch_to_section (sec
);
7165 /* The return value is currently ignored by the caller, but must be 0.
7166 For -fverbose-asm the return value would be the number of characters
7167 emitted into the assembler file. */
7171 /* Emit text to declare externally defined symbols. It is needed to
7172 properly support non-default visibility. */
7174 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7176 const char *name ATTRIBUTE_UNUSED
)
7178 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7179 set in order to avoid putting out names that are never really
7181 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7182 && targetm
.binds_local_p (decl
))
7183 maybe_assemble_visibility (decl
);
7186 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7189 default_asm_output_source_filename (FILE *file
, const char *name
)
7191 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7192 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7194 fprintf (file
, "\t.file\t");
7195 output_quoted_string (file
, name
);
7200 /* Output a file name in the form wanted by System V. */
7203 output_file_directive (FILE *asm_file
, const char *input_name
)
7208 if (input_name
== NULL
)
7209 input_name
= "<stdin>";
7211 input_name
= remap_debug_filename (input_name
);
7213 len
= strlen (input_name
);
7214 na
= input_name
+ len
;
7216 /* NA gets INPUT_NAME sans directory names. */
7217 while (na
> input_name
)
7219 if (IS_DIR_SEPARATOR (na
[-1]))
7224 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7227 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7230 make_debug_expr_from_rtl (const_rtx exp
)
7232 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7233 enum machine_mode mode
= GET_MODE (exp
);
7236 DECL_ARTIFICIAL (ddecl
) = 1;
7237 if (REG_P (exp
) && REG_EXPR (exp
))
7238 type
= TREE_TYPE (REG_EXPR (exp
));
7239 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7240 type
= TREE_TYPE (MEM_EXPR (exp
));
7243 if (type
&& TYPE_MODE (type
) == mode
)
7244 TREE_TYPE (ddecl
) = type
;
7246 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7247 DECL_MODE (ddecl
) = mode
;
7248 dval
= gen_rtx_DEBUG_EXPR (mode
);
7249 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7250 SET_DECL_RTL (ddecl
, dval
);
7254 #ifdef ELF_ASCII_ESCAPES
7255 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7258 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7263 fputs (STRING_ASM_OP
, f
);
7268 escape
= ELF_ASCII_ESCAPES
[c
];
7275 /* TODO: Print in hex with fast function, important for -flto. */
7276 fprintf (f
, "\\%03o", c
);
7289 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7292 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7294 const char *limit
= s
+ len
;
7295 const char *last_null
= NULL
;
7296 unsigned bytes_in_chunk
= 0;
7300 for (; s
< limit
; s
++)
7304 if (bytes_in_chunk
>= 60)
7313 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7320 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7322 if (bytes_in_chunk
> 0)
7329 default_elf_asm_output_limited_string (f
, s
);
7334 if (bytes_in_chunk
== 0)
7335 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7338 escape
= ELF_ASCII_ESCAPES
[c
];
7346 /* TODO: Print in hex with fast function, important for -flto. */
7347 fprintf (f
, "\\%03o", c
);
7348 bytes_in_chunk
+= 4;
7353 bytes_in_chunk
+= 2;
7360 if (bytes_in_chunk
> 0)
7368 static GTY(()) section
*elf_init_array_section
;
7369 static GTY(()) section
*elf_fini_array_section
;
7372 get_elf_initfini_array_priority_section (int priority
,
7376 if (priority
!= DEFAULT_INIT_PRIORITY
)
7379 sprintf (buf
, "%s.%.5u",
7380 constructor_p
? ".init_array" : ".fini_array",
7382 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7388 if (elf_init_array_section
== NULL
)
7389 elf_init_array_section
7390 = get_section (".init_array",
7391 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7392 sec
= elf_init_array_section
;
7396 if (elf_fini_array_section
== NULL
)
7397 elf_fini_array_section
7398 = get_section (".fini_array",
7399 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7400 sec
= elf_fini_array_section
;
7406 /* Use .init_array section for constructors. */
7409 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7411 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7413 assemble_addr_to_section (symbol
, sec
);
7416 /* Use .fini_array section for destructors. */
7419 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7421 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7423 assemble_addr_to_section (symbol
, sec
);
7426 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7428 This is a bit of a cheat. The real default is a no-op, but this
7429 hook is the default for all targets with a .ident directive. */
7432 default_asm_output_ident_directive (const char *ident_str
)
7434 const char *ident_asm_op
= "\t.ident\t";
7436 /* If we are still in the front end, do not write out the string
7437 to asm_out_file. Instead, add a fake top-level asm statement.
7438 This allows the front ends to use this hook without actually
7439 writing to asm_out_file, to handle #ident or Pragma Ident. */
7440 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7442 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7443 add_asm_node (build_string (strlen (buf
), buf
));
7446 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7449 #include "gt-varasm.h"