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, 2013 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 && !(flag_asan
&& asan_protect_global (decl
)))
1039 return lcomm_section
;
1040 if (bss_noswitch_section
)
1041 return bss_noswitch_section
;
1044 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1047 /* Return the block into which object_block DECL should be placed. */
1049 static struct object_block
*
1050 get_block_for_decl (tree decl
)
1054 if (TREE_CODE (decl
) == VAR_DECL
)
1056 /* The object must be defined in this translation unit. */
1057 if (DECL_EXTERNAL (decl
))
1060 /* There's no point using object blocks for something that is
1061 isolated by definition. */
1062 if (DECL_ONE_ONLY (decl
))
1066 /* We can only calculate block offsets if the decl has a known
1068 if (DECL_SIZE_UNIT (decl
) == NULL
)
1070 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1073 /* Find out which section should contain DECL. We cannot put it into
1074 an object block if it requires a standalone definition. */
1075 if (TREE_CODE (decl
) == VAR_DECL
)
1076 align_variable (decl
, 0);
1077 sect
= get_variable_section (decl
, true);
1078 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1081 return get_block_for_section (sect
);
1084 /* Make sure block symbol SYMBOL is in block BLOCK. */
1087 change_symbol_block (rtx symbol
, struct object_block
*block
)
1089 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1091 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1092 SYMBOL_REF_BLOCK (symbol
) = block
;
1096 /* Return true if it is possible to put DECL in an object_block. */
1099 use_blocks_for_decl_p (tree decl
)
1101 /* Only data DECLs can be placed into object blocks. */
1102 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1105 /* Detect decls created by dw2_force_const_mem. Such decls are
1106 special because DECL_INITIAL doesn't specify the decl's true value.
1107 dw2_output_indirect_constants will instead call assemble_variable
1108 with dont_output_data set to 1 and then print the contents itself. */
1109 if (DECL_INITIAL (decl
) == decl
)
1112 /* If this decl is an alias, then we don't want to emit a
1114 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1117 return targetm
.use_blocks_for_decl_p (decl
);
1120 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1121 have static storage duration. In other words, it should not be an
1122 automatic variable, including PARM_DECLs.
1124 There is, however, one exception: this function handles variables
1125 explicitly placed in a particular register by the user.
1127 This is never called for PARM_DECL nodes. */
1130 make_decl_rtl (tree decl
)
1132 const char *name
= 0;
1136 /* Check that we are not being given an automatic variable. */
1137 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1138 && TREE_CODE (decl
) != RESULT_DECL
);
1140 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1141 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1142 || TREE_STATIC (decl
)
1143 || TREE_PUBLIC (decl
)
1144 || DECL_EXTERNAL (decl
)
1145 || DECL_REGISTER (decl
));
1147 /* And that we were not given a type or a label. */
1148 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1149 && TREE_CODE (decl
) != LABEL_DECL
);
1151 /* For a duplicate declaration, we can be called twice on the
1152 same DECL node. Don't discard the RTL already made. */
1153 if (DECL_RTL_SET_P (decl
))
1155 /* If the old RTL had the wrong mode, fix the mode. */
1156 x
= DECL_RTL (decl
);
1157 if (GET_MODE (x
) != DECL_MODE (decl
))
1158 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1160 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1163 /* ??? Another way to do this would be to maintain a hashed
1164 table of such critters. Instead of adding stuff to a DECL
1165 to give certain attributes to it, we could use an external
1166 hash map from DECL to set of attributes. */
1168 /* Let the target reassign the RTL if it wants.
1169 This is necessary, for example, when one machine specific
1170 decl attribute overrides another. */
1171 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1173 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1174 on the new decl information. */
1176 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1177 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1178 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1180 /* Make this function static known to the mudflap runtime. */
1181 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1182 mudflap_enqueue_decl (decl
);
1187 /* If this variable belongs to the global constant pool, retrieve the
1188 pre-computed RTL or recompute it in LTO mode. */
1189 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1191 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1195 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1197 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1198 && DECL_REGISTER (decl
))
1200 error ("register name not specified for %q+D", decl
);
1202 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1204 const char *asmspec
= name
+1;
1205 enum machine_mode mode
= DECL_MODE (decl
);
1206 reg_number
= decode_reg_name (asmspec
);
1207 /* First detect errors in declaring global registers. */
1208 if (reg_number
== -1)
1209 error ("register name not specified for %q+D", decl
);
1210 else if (reg_number
< 0)
1211 error ("invalid register name for %q+D", decl
);
1212 else if (mode
== BLKmode
)
1213 error ("data type of %q+D isn%'t suitable for a register",
1215 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1216 error ("the register specified for %q+D cannot be accessed"
1217 " by the current target", decl
);
1218 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1219 error ("the register specified for %q+D is not general enough"
1220 " to be used as a register variable", decl
);
1221 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1222 error ("register specified for %q+D isn%'t suitable for data type",
1224 /* Now handle properly declared static register variables. */
1229 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1231 DECL_INITIAL (decl
) = 0;
1232 error ("global register variable has initial value");
1234 if (TREE_THIS_VOLATILE (decl
))
1235 warning (OPT_Wvolatile_register_var
,
1236 "optimization may eliminate reads and/or "
1237 "writes to register variables");
1239 /* If the user specified one of the eliminables registers here,
1240 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1241 confused with that register and be eliminated. This usage is
1242 somewhat suspect... */
1244 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1245 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1246 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1248 if (TREE_STATIC (decl
))
1250 /* Make this register global, so not usable for anything
1252 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1253 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1254 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1256 nregs
= hard_regno_nregs
[reg_number
][mode
];
1258 globalize_reg (decl
, reg_number
+ --nregs
);
1261 /* As a register variable, it has no section. */
1265 /* Now handle ordinary static variables and functions (in memory).
1266 Also handle vars declared register invalidly. */
1267 else if (name
[0] == '*')
1269 #ifdef REGISTER_PREFIX
1270 if (strlen (REGISTER_PREFIX
) != 0)
1272 reg_number
= decode_reg_name (name
);
1273 if (reg_number
>= 0 || reg_number
== -3)
1274 error ("register name given for non-register variable %q+D", decl
);
1279 /* Specifying a section attribute on a variable forces it into a
1280 non-.bss section, and thus it cannot be common. */
1281 /* FIXME: In general this code should not be necessary because
1282 visibility pass is doing the same work. But notice_global_symbol
1283 is called early and it needs to make DECL_RTL to get the name.
1284 we take care of recomputing the DECL_RTL after visibility is changed. */
1285 if (TREE_CODE (decl
) == VAR_DECL
1286 && DECL_SECTION_NAME (decl
) != NULL_TREE
1287 && DECL_INITIAL (decl
) == NULL_TREE
1288 && DECL_COMMON (decl
))
1289 DECL_COMMON (decl
) = 0;
1291 /* Variables can't be both common and weak. */
1292 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1293 DECL_COMMON (decl
) = 0;
1295 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1296 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1299 enum machine_mode address_mode
= Pmode
;
1300 if (TREE_TYPE (decl
) != error_mark_node
)
1302 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1303 address_mode
= targetm
.addr_space
.address_mode (as
);
1305 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1307 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1308 SET_SYMBOL_REF_DECL (x
, decl
);
1310 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1311 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1312 set_mem_attributes (x
, decl
, 1);
1313 SET_DECL_RTL (decl
, x
);
1315 /* Optionally set flags or add text to the name to record information
1316 such as that it is a function name.
1317 If the name is changed, the macro ASM_OUTPUT_LABELREF
1318 will have to know how to strip this information. */
1319 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1321 /* Make this function static known to the mudflap runtime. */
1322 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1323 mudflap_enqueue_decl (decl
);
1326 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1327 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1331 make_decl_rtl_for_debug (tree decl
)
1333 unsigned int save_aliasing_flag
, save_mudflap_flag
;
1336 if (DECL_RTL_SET_P (decl
))
1337 return DECL_RTL (decl
);
1339 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1340 call new_alias_set. If running with -fcompare-debug, sometimes
1341 we do not want to create alias sets that will throw the alias
1342 numbers off in the comparison dumps. So... clearing
1343 flag_strict_aliasing will keep new_alias_set() from creating a
1344 new set. It is undesirable to register decl with mudflap
1345 in this case as well. */
1346 save_aliasing_flag
= flag_strict_aliasing
;
1347 flag_strict_aliasing
= 0;
1348 save_mudflap_flag
= flag_mudflap
;
1351 rtl
= DECL_RTL (decl
);
1352 /* Reset DECL_RTL back, as various parts of the compiler expects
1353 DECL_RTL set meaning it is actually going to be output. */
1354 SET_DECL_RTL (decl
, NULL
);
1356 flag_strict_aliasing
= save_aliasing_flag
;
1357 flag_mudflap
= save_mudflap_flag
;
1362 /* Output a string of literal assembler code
1363 for an `asm' keyword used between functions. */
1366 assemble_asm (tree string
)
1371 if (TREE_CODE (string
) == ADDR_EXPR
)
1372 string
= TREE_OPERAND (string
, 0);
1374 p
= TREE_STRING_POINTER (string
);
1375 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1378 /* Write the address of the entity given by SYMBOL to SEC. */
1380 assemble_addr_to_section (rtx symbol
, section
*sec
)
1382 switch_to_section (sec
);
1383 assemble_align (POINTER_SIZE
);
1384 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1387 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1388 not) section for PRIORITY. */
1390 get_cdtor_priority_section (int priority
, bool constructor_p
)
1394 /* ??? This only works reliably with the GNU linker. */
1395 sprintf (buf
, "%s.%.5u",
1396 constructor_p
? ".ctors" : ".dtors",
1397 /* Invert the numbering so the linker puts us in the proper
1398 order; constructors are run from right to left, and the
1399 linker sorts in increasing order. */
1400 MAX_INIT_PRIORITY
- priority
);
1401 return get_section (buf
, SECTION_WRITE
, NULL
);
1405 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1409 if (priority
!= DEFAULT_INIT_PRIORITY
)
1410 sec
= get_cdtor_priority_section (priority
,
1411 /*constructor_p=*/false);
1413 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1415 assemble_addr_to_section (symbol
, sec
);
1418 #ifdef DTORS_SECTION_ASM_OP
1420 default_dtor_section_asm_out_destructor (rtx symbol
,
1421 int priority ATTRIBUTE_UNUSED
)
1423 assemble_addr_to_section (symbol
, dtors_section
);
1428 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1432 if (priority
!= DEFAULT_INIT_PRIORITY
)
1433 sec
= get_cdtor_priority_section (priority
,
1434 /*constructor_p=*/true);
1436 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1438 assemble_addr_to_section (symbol
, sec
);
1441 #ifdef CTORS_SECTION_ASM_OP
1443 default_ctor_section_asm_out_constructor (rtx symbol
,
1444 int priority ATTRIBUTE_UNUSED
)
1446 assemble_addr_to_section (symbol
, ctors_section
);
1450 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1451 a nonzero value if the constant pool should be output before the
1452 start of the function, or a zero value if the pool should output
1453 after the end of the function. The default is to put it before the
1456 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1457 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1460 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1461 to be output to assembler.
1462 Set first_global_object_name and weak_global_object_name as appropriate. */
1465 notice_global_symbol (tree decl
)
1467 const char **type
= &first_global_object_name
;
1469 if (first_global_object_name
1470 || !TREE_PUBLIC (decl
)
1471 || DECL_EXTERNAL (decl
)
1472 || !DECL_NAME (decl
)
1473 || (TREE_CODE (decl
) != FUNCTION_DECL
1474 && (TREE_CODE (decl
) != VAR_DECL
1475 || (DECL_COMMON (decl
)
1476 && (DECL_INITIAL (decl
) == 0
1477 || DECL_INITIAL (decl
) == error_mark_node
))))
1478 || !MEM_P (DECL_RTL (decl
)))
1481 /* We win when global object is found, but it is useful to know about weak
1482 symbol as well so we can produce nicer unique names. */
1483 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1484 type
= &weak_global_object_name
;
1490 rtx decl_rtl
= DECL_RTL (decl
);
1492 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1493 name
= ggc_strdup (p
);
1499 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1500 current function goes into the cold section, so that targets can use
1501 current_function_section during RTL expansion. DECL describes the
1505 decide_function_section (tree decl
)
1507 first_function_block_is_cold
= false;
1509 if (flag_reorder_blocks_and_partition
)
1510 /* We will decide in assemble_start_function. */
1513 if (DECL_SECTION_NAME (decl
))
1515 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1516 /* Calls to function_section rely on first_function_block_is_cold
1518 first_function_block_is_cold
= (node
1520 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1523 in_cold_section_p
= first_function_block_is_cold
;
1526 /* Output assembler code for the constant pool of a function and associated
1527 with defining the name of the function. DECL describes the function.
1528 NAME is the function's name. For the constant pool, we use the current
1529 constant pool data. */
1532 assemble_start_function (tree decl
, const char *fnname
)
1535 char tmp_label
[100];
1536 bool hot_label_written
= false;
1538 if (flag_reorder_blocks_and_partition
)
1540 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1541 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1542 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1543 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1544 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1545 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1546 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1547 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1552 crtl
->subsections
.hot_section_label
= NULL
;
1553 crtl
->subsections
.cold_section_label
= NULL
;
1554 crtl
->subsections
.hot_section_end_label
= NULL
;
1555 crtl
->subsections
.cold_section_end_label
= NULL
;
1558 /* The following code does not need preprocessing in the assembler. */
1562 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1563 output_constant_pool (fnname
, decl
);
1565 /* Make sure the not and cold text (code) sections are properly
1566 aligned. This is necessary here in the case where the function
1567 has both hot and cold sections, because we don't want to re-set
1568 the alignment when the section switch happens mid-function. */
1570 if (flag_reorder_blocks_and_partition
)
1572 first_function_block_is_cold
= false;
1574 switch_to_section (unlikely_text_section ());
1575 assemble_align (DECL_ALIGN (decl
));
1576 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1578 /* When the function starts with a cold section, we need to explicitly
1579 align the hot section and write out the hot section label.
1580 But if the current function is a thunk, we do not have a CFG. */
1582 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1584 switch_to_section (text_section
);
1585 assemble_align (DECL_ALIGN (decl
));
1586 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1587 hot_label_written
= true;
1588 first_function_block_is_cold
= true;
1590 in_cold_section_p
= first_function_block_is_cold
;
1594 /* Switch to the correct text section for the start of the function. */
1596 switch_to_section (function_section (decl
));
1597 if (flag_reorder_blocks_and_partition
1598 && !hot_label_written
)
1599 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1601 /* Tell assembler to move to target machine's alignment for functions. */
1602 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1605 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1608 /* Handle a user-specified function alignment.
1609 Note that we still need to align to DECL_ALIGN, as above,
1610 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1611 if (! DECL_USER_ALIGN (decl
)
1612 && align_functions_log
> align
1613 && optimize_function_for_speed_p (cfun
))
1615 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1616 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1617 align_functions_log
, align_functions
- 1);
1619 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1623 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1624 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1627 if (!DECL_IGNORED_P (decl
))
1628 (*debug_hooks
->begin_function
) (decl
);
1630 /* Make function name accessible from other files, if appropriate. */
1632 if (TREE_PUBLIC (decl
))
1634 notice_global_symbol (decl
);
1636 globalize_decl (decl
);
1638 maybe_assemble_visibility (decl
);
1641 if (DECL_PRESERVE_P (decl
))
1642 targetm
.asm_out
.mark_decl_preserved (fnname
);
1644 /* Do any machine/system dependent processing of the function name. */
1645 #ifdef ASM_DECLARE_FUNCTION_NAME
1646 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1648 /* Standard thing is just output label for the function. */
1649 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1650 #endif /* ASM_DECLARE_FUNCTION_NAME */
1652 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1653 saw_no_split_stack
= true;
1656 /* Output assembler code associated with defining the size of the
1657 function. DECL describes the function. NAME is the function's name. */
1660 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1662 #ifdef ASM_DECLARE_FUNCTION_SIZE
1663 /* We could have switched section in the middle of the function. */
1664 if (flag_reorder_blocks_and_partition
)
1665 switch_to_section (function_section (decl
));
1666 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1668 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1670 output_constant_pool (fnname
, decl
);
1671 switch_to_section (function_section (decl
)); /* need to switch back */
1673 /* Output labels for end of hot/cold text sections (to be used by
1675 if (flag_reorder_blocks_and_partition
)
1677 section
*save_text_section
;
1679 save_text_section
= in_section
;
1680 switch_to_section (unlikely_text_section ());
1681 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1682 if (first_function_block_is_cold
)
1683 switch_to_section (text_section
);
1685 switch_to_section (function_section (decl
));
1686 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1687 switch_to_section (save_text_section
);
1691 /* Assemble code to leave SIZE bytes of zeros. */
1694 assemble_zeros (unsigned HOST_WIDE_INT size
)
1696 /* Do no output if -fsyntax-only. */
1697 if (flag_syntax_only
)
1700 #ifdef ASM_NO_SKIP_IN_TEXT
1701 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1702 so we must output 0s explicitly in the text section. */
1703 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1705 unsigned HOST_WIDE_INT i
;
1706 for (i
= 0; i
< size
; i
++)
1707 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1712 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1715 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1718 assemble_align (int align
)
1720 if (align
> BITS_PER_UNIT
)
1722 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1726 /* Assemble a string constant with the specified C string as contents. */
1729 assemble_string (const char *p
, int size
)
1734 /* If the string is very long, split it up. */
1738 int thissize
= size
- pos
;
1739 if (thissize
> maximum
)
1742 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1750 /* A noswitch_section_callback for lcomm_section. */
1753 emit_local (tree decl ATTRIBUTE_UNUSED
,
1754 const char *name ATTRIBUTE_UNUSED
,
1755 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1756 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1758 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1759 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1760 size
, DECL_ALIGN (decl
));
1762 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1763 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1766 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1771 /* A noswitch_section_callback for bss_noswitch_section. */
1773 #if defined ASM_OUTPUT_ALIGNED_BSS
1775 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1776 const char *name ATTRIBUTE_UNUSED
,
1777 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1778 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1780 #if defined ASM_OUTPUT_ALIGNED_BSS
1781 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1787 /* A noswitch_section_callback for comm_section. */
1790 emit_common (tree decl ATTRIBUTE_UNUSED
,
1791 const char *name ATTRIBUTE_UNUSED
,
1792 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1793 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1795 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1796 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1797 size
, DECL_ALIGN (decl
));
1799 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1800 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1803 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1808 /* A noswitch_section_callback for tls_comm_section. */
1811 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1812 const char *name ATTRIBUTE_UNUSED
,
1813 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1814 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1816 #ifdef ASM_OUTPUT_TLS_COMMON
1817 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1820 sorry ("thread-local COMMON data not implemented");
1825 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1826 NAME is the name of DECL's SYMBOL_REF. */
1829 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1831 unsigned HOST_WIDE_INT size
, rounded
;
1833 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1836 if (flag_asan
&& asan_protect_global (decl
))
1837 size
+= asan_red_zone_size (size
);
1839 /* Don't allocate zero bytes of common,
1840 since that means "undefined external" in the linker. */
1844 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1845 so that each uninitialized object starts on such a boundary. */
1846 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1847 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1848 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1850 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1851 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1852 warning (0, "requested alignment for %q+D is greater than "
1853 "implemented alignment of %wu", decl
, rounded
);
1856 /* A subroutine of assemble_variable. Output the label and contents of
1857 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1858 is as for assemble_variable. */
1861 assemble_variable_contents (tree decl
, const char *name
,
1862 bool dont_output_data
)
1864 /* Do any machine/system dependent processing of the object. */
1865 #ifdef ASM_DECLARE_OBJECT_NAME
1866 last_assemble_variable_decl
= decl
;
1867 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1869 /* Standard thing is just output label for the object. */
1870 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1871 #endif /* ASM_DECLARE_OBJECT_NAME */
1873 if (!dont_output_data
)
1875 if (DECL_INITIAL (decl
)
1876 && DECL_INITIAL (decl
) != error_mark_node
1877 && !initializer_zerop (DECL_INITIAL (decl
)))
1878 /* Output the actual data. */
1879 output_constant (DECL_INITIAL (decl
),
1880 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1883 /* Leave space for it. */
1884 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1888 /* Assemble everything that is needed for a variable or function declaration.
1889 Not used for automatic variables, and not used for function definitions.
1890 Should not be called for variables of incomplete structure type.
1892 TOP_LEVEL is nonzero if this variable has file scope.
1893 AT_END is nonzero if this is the special handling, at end of compilation,
1894 to define things that have had only tentative definitions.
1895 DONT_OUTPUT_DATA if nonzero means don't actually output the
1896 initial value (that will be done by the caller). */
1899 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1900 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1903 rtx decl_rtl
, symbol
;
1905 bool asan_protected
= false;
1907 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1908 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1910 /* Emulated TLS had better not get this far. */
1911 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1913 last_assemble_variable_decl
= 0;
1915 /* Normally no need to say anything here for external references,
1916 since assemble_external is called by the language-specific code
1917 when a declaration is first seen. */
1919 if (DECL_EXTERNAL (decl
))
1922 /* Do nothing for global register variables. */
1923 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1925 TREE_ASM_WRITTEN (decl
) = 1;
1929 /* If type was incomplete when the variable was declared,
1930 see if it is complete now. */
1932 if (DECL_SIZE (decl
) == 0)
1933 layout_decl (decl
, 0);
1935 /* Still incomplete => don't allocate it; treat the tentative defn
1936 (which is what it must have been) as an `extern' reference. */
1938 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
1940 error ("storage size of %q+D isn%'t known", decl
);
1941 TREE_ASM_WRITTEN (decl
) = 1;
1945 /* The first declaration of a variable that comes through this function
1946 decides whether it is global (in C, has external linkage)
1947 or local (in C, has internal linkage). So do nothing more
1948 if this function has already run. */
1950 if (TREE_ASM_WRITTEN (decl
))
1953 /* Make sure targetm.encode_section_info is invoked before we set
1955 decl_rtl
= DECL_RTL (decl
);
1957 TREE_ASM_WRITTEN (decl
) = 1;
1959 /* Do no output if -fsyntax-only. */
1960 if (flag_syntax_only
)
1963 if (! dont_output_data
1964 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
1966 error ("size of variable %q+D is too large", decl
);
1970 gcc_assert (MEM_P (decl_rtl
));
1971 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
1972 symbol
= XEXP (decl_rtl
, 0);
1974 /* If this symbol belongs to the tree constant pool, output the constant
1975 if it hasn't already been written. */
1976 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
1978 tree decl
= SYMBOL_REF_DECL (symbol
);
1979 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
1980 output_constant_def_contents (symbol
);
1986 name
= XSTR (symbol
, 0);
1987 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
1988 notice_global_symbol (decl
);
1990 /* Compute the alignment of this data. */
1992 align_variable (decl
, dont_output_data
);
1995 && asan_protect_global (decl
))
1997 asan_protected
= true;
1998 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
1999 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2002 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2004 if (TREE_PUBLIC (decl
))
2005 maybe_assemble_visibility (decl
);
2007 if (DECL_PRESERVE_P (decl
))
2008 targetm
.asm_out
.mark_decl_preserved (name
);
2010 /* First make the assembler name(s) global if appropriate. */
2011 sect
= get_variable_section (decl
, false);
2012 if (TREE_PUBLIC (decl
)
2013 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2014 globalize_decl (decl
);
2016 /* Output any data that we will need to use the address of. */
2017 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2018 output_addressed_constants (DECL_INITIAL (decl
));
2020 /* dbxout.c needs to know this. */
2021 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2022 DECL_IN_TEXT_SECTION (decl
) = 1;
2024 /* If the decl is part of an object_block, make sure that the decl
2025 has been positioned within its block, but do not write out its
2026 definition yet. output_object_blocks will do that later. */
2027 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2029 gcc_assert (!dont_output_data
);
2030 place_block_symbol (symbol
);
2032 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2033 assemble_noswitch_variable (decl
, name
, sect
);
2036 switch_to_section (sect
);
2037 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2038 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2039 assemble_variable_contents (decl
, name
, dont_output_data
);
2042 unsigned HOST_WIDE_INT
int size
2043 = tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
2044 assemble_zeros (asan_red_zone_size (size
));
2049 /* Return 1 if type TYPE contains any pointers. */
2052 contains_pointers_p (tree type
)
2054 switch (TREE_CODE (type
))
2057 case REFERENCE_TYPE
:
2058 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2059 so I'll play safe and return 1. */
2065 case QUAL_UNION_TYPE
:
2068 /* For a type that has fields, see if the fields have pointers. */
2069 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2070 if (TREE_CODE (fields
) == FIELD_DECL
2071 && contains_pointers_p (TREE_TYPE (fields
)))
2077 /* An array type contains pointers if its element type does. */
2078 return contains_pointers_p (TREE_TYPE (type
));
2085 /* We delay assemble_external processing until
2086 the compilation unit is finalized. This is the best we can do for
2087 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2088 it all the way to final. See PR 17982 for further discussion. */
2089 static GTY(()) tree pending_assemble_externals
;
2091 #ifdef ASM_OUTPUT_EXTERNAL
2092 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2093 As a result, assemble_external can be called after the list of externals
2094 is processed and the pointer set destroyed. */
2095 static bool pending_assemble_externals_processed
;
2097 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2098 TREE_LIST in assemble_external. */
2099 static struct pointer_set_t
*pending_assemble_externals_set
;
2101 /* True if DECL is a function decl for which no out-of-line copy exists.
2102 It is assumed that DECL's assembler name has been set. */
2105 incorporeal_function_p (tree decl
)
2107 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2111 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2112 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2113 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2116 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2117 /* Atomic or sync builtins which have survived this far will be
2118 resolved externally and therefore are not incorporeal. */
2119 if (strncmp (name
, "__builtin_", 10) == 0)
2125 /* Actually do the tests to determine if this is necessary, and invoke
2126 ASM_OUTPUT_EXTERNAL. */
2128 assemble_external_real (tree decl
)
2130 rtx rtl
= DECL_RTL (decl
);
2132 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2133 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2134 && !incorporeal_function_p (decl
))
2136 /* Some systems do require some output. */
2137 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2138 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2144 process_pending_assemble_externals (void)
2146 #ifdef ASM_OUTPUT_EXTERNAL
2148 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2149 assemble_external_real (TREE_VALUE (list
));
2151 pending_assemble_externals
= 0;
2152 pending_assemble_externals_processed
= true;
2153 pointer_set_destroy (pending_assemble_externals_set
);
2157 /* This TREE_LIST contains any weak symbol declarations waiting
2159 static GTY(()) tree weak_decls
;
2161 /* Output something to declare an external symbol to the assembler,
2162 and qualifiers such as weakness. (Most assemblers don't need
2163 extern declaration, so we normally output nothing.) Do nothing if
2164 DECL is not external. */
2167 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2169 /* Make sure that the ASM_OUT_FILE is open.
2170 If it's not, we should not be calling this function. */
2171 gcc_assert (asm_out_file
);
2173 /* In a perfect world, the following condition would be true.
2174 Sadly, the Java and Go front ends emit assembly *from the front end*,
2175 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2177 /* This function should only be called if we are expanding, or have
2179 Ideally, only final.c would be calling this function, but it is
2180 not clear whether that would break things somehow. See PR 17982
2181 for further discussion. */
2182 gcc_assert (cgraph_state
== CGRAPH_STATE_EXPANSION
2183 || cgraph_state
== CGRAPH_STATE_FINISHED
);
2186 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2189 /* We want to output annotation for weak and external symbols at
2190 very last to check if they are references or not. */
2192 if (TARGET_SUPPORTS_WEAK
2194 /* TREE_STATIC is a weird and abused creature which is not
2195 generally the right test for whether an entity has been
2196 locally emitted, inlined or otherwise not-really-extern, but
2197 for declarations that can be weak, it happens to be
2199 && !TREE_STATIC (decl
)
2200 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2201 && value_member (decl
, weak_decls
) == NULL_TREE
)
2202 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2204 #ifdef ASM_OUTPUT_EXTERNAL
2205 if (pending_assemble_externals_processed
)
2207 assemble_external_real (decl
);
2211 if (! pointer_set_insert (pending_assemble_externals_set
, decl
))
2212 pending_assemble_externals
= tree_cons (NULL
, decl
,
2213 pending_assemble_externals
);
2217 /* Similar, for calling a library function FUN. */
2220 assemble_external_libcall (rtx fun
)
2222 /* Declare library function name external when first used, if nec. */
2223 if (! SYMBOL_REF_USED (fun
))
2225 SYMBOL_REF_USED (fun
) = 1;
2226 targetm
.asm_out
.external_libcall (fun
);
2230 /* Assemble a label named NAME. */
2233 assemble_label (FILE *file
, const char *name
)
2235 ASM_OUTPUT_LABEL (file
, name
);
2238 /* Set the symbol_referenced flag for ID. */
2240 mark_referenced (tree id
)
2242 TREE_SYMBOL_REFERENCED (id
) = 1;
2245 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2247 mark_decl_referenced (tree decl
)
2249 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2251 /* Extern inline functions don't become needed when referenced.
2252 If we know a method will be emitted in other TU and no new
2253 functions can be marked reachable, just use the external
2255 struct cgraph_node
*node
= cgraph_get_create_node (decl
);
2256 if (!DECL_EXTERNAL (decl
)
2257 && !node
->local
.finalized
)
2258 cgraph_mark_force_output_node (node
);
2260 else if (TREE_CODE (decl
) == VAR_DECL
)
2262 struct varpool_node
*node
= varpool_node_for_decl (decl
);
2263 /* C++ frontend use mark_decl_references to force COMDAT variables
2264 to be output that might appear dead otherwise. */
2265 node
->symbol
.force_output
= true;
2267 /* else do nothing - we can get various sorts of CST nodes here,
2268 which do not need to be marked. */
2272 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2273 until we find an identifier that is not itself a transparent alias.
2274 Modify the alias passed to it by reference (and all aliases on the
2275 way to the ultimate target), such that they do not have to be
2276 followed again, and return the ultimate target of the alias
2280 ultimate_transparent_alias_target (tree
*alias
)
2282 tree target
= *alias
;
2284 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2286 gcc_assert (TREE_CHAIN (target
));
2287 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2288 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2289 && ! TREE_CHAIN (target
));
2296 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2297 starts with a *, the rest of NAME is output verbatim. Otherwise
2298 NAME is transformed in a target-specific way (usually by the
2299 addition of an underscore). */
2302 assemble_name_raw (FILE *file
, const char *name
)
2305 fputs (&name
[1], file
);
2307 ASM_OUTPUT_LABELREF (file
, name
);
2310 /* Like assemble_name_raw, but should be used when NAME might refer to
2311 an entity that is also represented as a tree (like a function or
2312 variable). If NAME does refer to such an entity, that entity will
2313 be marked as referenced. */
2316 assemble_name (FILE *file
, const char *name
)
2318 const char *real_name
;
2321 real_name
= targetm
.strip_name_encoding (name
);
2323 id
= maybe_get_identifier (real_name
);
2328 mark_referenced (id
);
2329 ultimate_transparent_alias_target (&id
);
2331 name
= IDENTIFIER_POINTER (id
);
2332 gcc_assert (! TREE_CHAIN (id
));
2335 assemble_name_raw (file
, name
);
2338 /* Allocate SIZE bytes writable static space with a gensym name
2339 and return an RTX to refer to its address. */
2342 assemble_static_space (unsigned HOST_WIDE_INT size
)
2345 const char *namestring
;
2348 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2350 namestring
= ggc_strdup (name
);
2352 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2353 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2355 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2356 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2359 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2360 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2363 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2364 so that each uninitialized object starts on such a boundary. */
2365 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2366 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2367 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2368 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2369 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2370 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2377 /* Assemble the static constant template for function entry trampolines.
2378 This is done at most once per compilation.
2379 Returns an RTX for the address of the template. */
2381 static GTY(()) rtx initial_trampoline
;
2384 assemble_trampoline_template (void)
2391 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2393 if (initial_trampoline
)
2394 return initial_trampoline
;
2396 /* By default, put trampoline templates in read-only data section. */
2398 #ifdef TRAMPOLINE_SECTION
2399 switch_to_section (TRAMPOLINE_SECTION
);
2401 switch_to_section (readonly_data_section
);
2404 /* Write the assembler code to define one. */
2405 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2407 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2409 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2410 targetm
.asm_out
.trampoline_template (asm_out_file
);
2412 /* Record the rtl to refer to it. */
2413 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2414 name
= ggc_strdup (label
);
2415 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2416 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2418 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2419 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2420 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2422 return initial_trampoline
;
2425 /* A and B are either alignments or offsets. Return the minimum alignment
2426 that may be assumed after adding the two together. */
2428 static inline unsigned
2429 min_align (unsigned int a
, unsigned int b
)
2431 return (a
| b
) & -(a
| b
);
2434 /* Return the assembler directive for creating a given kind of integer
2435 object. SIZE is the number of bytes in the object and ALIGNED_P
2436 indicates whether it is known to be aligned. Return NULL if the
2437 assembly dialect has no such directive.
2439 The returned string should be printed at the start of a new line and
2440 be followed immediately by the object's initial value. */
2443 integer_asm_op (int size
, int aligned_p
)
2445 struct asm_int_op
*ops
;
2448 ops
= &targetm
.asm_out
.aligned_op
;
2450 ops
= &targetm
.asm_out
.unaligned_op
;
2455 return targetm
.asm_out
.byte_op
;
2469 /* Use directive OP to assemble an integer object X. Print OP at the
2470 start of the line, followed immediately by the value of X. */
2473 assemble_integer_with_op (const char *op
, rtx x
)
2475 fputs (op
, asm_out_file
);
2476 output_addr_const (asm_out_file
, x
);
2477 fputc ('\n', asm_out_file
);
2480 /* The default implementation of the asm_out.integer target hook. */
2483 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2484 unsigned int size ATTRIBUTE_UNUSED
,
2485 int aligned_p ATTRIBUTE_UNUSED
)
2487 const char *op
= integer_asm_op (size
, aligned_p
);
2488 /* Avoid GAS bugs for large values. Specifically negative values whose
2489 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2490 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2492 return op
&& (assemble_integer_with_op (op
, x
), true);
2495 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2496 the alignment of the integer in bits. Return 1 if we were able to output
2497 the constant, otherwise 0. We must be able to output the constant,
2498 if FORCE is nonzero. */
2501 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2505 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2507 /* See if the target hook can handle this kind of object. */
2508 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2511 /* If the object is a multi-byte one, try splitting it up. Split
2512 it into words it if is multi-word, otherwise split it into bytes. */
2515 enum machine_mode omode
, imode
;
2516 unsigned int subalign
;
2517 unsigned int subsize
, i
;
2518 enum mode_class mclass
;
2520 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2521 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2522 if (GET_CODE (x
) == CONST_FIXED
)
2523 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2527 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2528 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2530 for (i
= 0; i
< size
; i
+= subsize
)
2532 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2533 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2539 /* If we've printed some of it, but not all of it, there's no going
2544 gcc_assert (!force
);
2550 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2552 long data
[4] = {0, 0, 0, 0};
2554 int bitsize
, nelts
, nunits
, units_per
;
2556 /* This is hairy. We have a quantity of known size. real_to_target
2557 will put it into an array of *host* longs, 32 bits per element
2558 (even if long is more than 32 bits). We need to determine the
2559 number of array elements that are occupied (nelts) and the number
2560 of *target* min-addressable units that will be occupied in the
2561 object file (nunits). We cannot assume that 32 divides the
2562 mode's bitsize (size * BITS_PER_UNIT) evenly.
2564 size * BITS_PER_UNIT is used here to make sure that padding bits
2565 (which might appear at either end of the value; real_to_target
2566 will include the padding bits in its output array) are included. */
2568 nunits
= GET_MODE_SIZE (mode
);
2569 bitsize
= nunits
* BITS_PER_UNIT
;
2570 nelts
= CEIL (bitsize
, 32);
2571 units_per
= 32 / BITS_PER_UNIT
;
2573 real_to_target (data
, &d
, mode
);
2575 /* Put out the first word with the specified alignment. */
2576 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2577 nunits
-= units_per
;
2579 /* Subsequent words need only 32-bit alignment. */
2580 align
= min_align (align
, 32);
2582 for (i
= 1; i
< nelts
; i
++)
2584 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2585 nunits
-= units_per
;
2589 /* Given an expression EXP with a constant value,
2590 reduce it to the sum of an assembler symbol and an integer.
2591 Store them both in the structure *VALUE.
2592 EXP must be reducible. */
2596 HOST_WIDE_INT offset
;
2600 decode_addr_const (tree exp
, struct addr_const
*value
)
2602 tree target
= TREE_OPERAND (exp
, 0);
2608 if (TREE_CODE (target
) == COMPONENT_REF
2609 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2611 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2612 target
= TREE_OPERAND (target
, 0);
2614 else if (TREE_CODE (target
) == ARRAY_REF
2615 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2617 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2618 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2619 target
= TREE_OPERAND (target
, 0);
2621 else if (TREE_CODE (target
) == MEM_REF
2622 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2624 offset
+= mem_ref_offset (target
).low
;
2625 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2627 else if (TREE_CODE (target
) == INDIRECT_REF
2628 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2629 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2631 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2636 switch (TREE_CODE (target
))
2640 x
= DECL_RTL (target
);
2644 x
= gen_rtx_MEM (FUNCTION_MODE
,
2645 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2654 x
= output_constant_def (target
, 1);
2661 gcc_assert (MEM_P (x
));
2665 value
->offset
= offset
;
2669 static GTY((param_is (struct constant_descriptor_tree
)))
2670 htab_t const_desc_htab
;
2672 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2674 /* Constant pool accessor function. */
2677 constant_pool_htab (void)
2679 return const_desc_htab
;
2682 /* Compute a hash code for a constant expression. */
2685 const_desc_hash (const void *ptr
)
2687 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2691 const_hash_1 (const tree exp
)
2696 enum tree_code code
= TREE_CODE (exp
);
2698 /* Either set P and LEN to the address and len of something to hash and
2699 exit the switch or return a value. */
2704 p
= (char *) &TREE_INT_CST (exp
);
2705 len
= sizeof TREE_INT_CST (exp
);
2709 return real_hash (TREE_REAL_CST_PTR (exp
));
2712 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2715 p
= TREE_STRING_POINTER (exp
);
2716 len
= TREE_STRING_LENGTH (exp
);
2720 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2721 + const_hash_1 (TREE_IMAGPART (exp
)));
2727 hi
= 7 + VECTOR_CST_NELTS (exp
);
2729 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2730 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2737 unsigned HOST_WIDE_INT idx
;
2740 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2742 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2744 hi
= hi
* 603 + const_hash_1 (value
);
2752 struct addr_const value
;
2754 decode_addr_const (exp
, &value
);
2755 switch (GET_CODE (value
.base
))
2758 /* Don't hash the address of the SYMBOL_REF;
2759 only use the offset and the symbol name. */
2761 p
= XSTR (value
.base
, 0);
2762 for (i
= 0; p
[i
] != 0; i
++)
2763 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2767 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2777 case POINTER_PLUS_EXPR
:
2779 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2780 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2783 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2786 /* A language specific constant. Just hash the code. */
2790 /* Compute hashing function. */
2792 for (i
= 0; i
< len
; i
++)
2793 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2798 /* Wrapper of compare_constant, for the htab interface. */
2800 const_desc_eq (const void *p1
, const void *p2
)
2802 const struct constant_descriptor_tree
*const c1
2803 = (const struct constant_descriptor_tree
*) p1
;
2804 const struct constant_descriptor_tree
*const c2
2805 = (const struct constant_descriptor_tree
*) p2
;
2806 if (c1
->hash
!= c2
->hash
)
2808 return compare_constant (c1
->value
, c2
->value
);
2811 /* Compare t1 and t2, and return 1 only if they are known to result in
2812 the same bit pattern on output. */
2815 compare_constant (const tree t1
, const tree t2
)
2817 enum tree_code typecode
;
2819 if (t1
== NULL_TREE
)
2820 return t2
== NULL_TREE
;
2821 if (t2
== NULL_TREE
)
2824 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2827 switch (TREE_CODE (t1
))
2830 /* Integer constants are the same only if the same width of type. */
2831 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2833 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2835 return tree_int_cst_equal (t1
, t2
);
2838 /* Real constants are the same only if the same width of type. */
2839 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2842 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2845 /* Fixed constants are the same only if the same width of type. */
2846 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2849 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2852 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2855 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2856 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2857 TREE_STRING_LENGTH (t1
)));
2860 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2861 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2867 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
2870 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
2871 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
2872 VECTOR_CST_ELT (t2
, i
)))
2880 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
2881 unsigned HOST_WIDE_INT idx
;
2883 typecode
= TREE_CODE (TREE_TYPE (t1
));
2884 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2887 if (typecode
== ARRAY_TYPE
)
2889 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2890 /* For arrays, check that the sizes all match. */
2891 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2893 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2898 /* For record and union constructors, require exact type
2900 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2904 v1
= CONSTRUCTOR_ELTS (t1
);
2905 v2
= CONSTRUCTOR_ELTS (t2
);
2906 if (vec_safe_length (v1
) != vec_safe_length (v2
))
2909 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
2911 constructor_elt
*c1
= &(*v1
)[idx
];
2912 constructor_elt
*c2
= &(*v2
)[idx
];
2914 /* Check that each value is the same... */
2915 if (!compare_constant (c1
->value
, c2
->value
))
2917 /* ... and that they apply to the same fields! */
2918 if (typecode
== ARRAY_TYPE
)
2920 if (!compare_constant (c1
->index
, c2
->index
))
2925 if (c1
->index
!= c2
->index
)
2936 struct addr_const value1
, value2
;
2940 decode_addr_const (t1
, &value1
);
2941 decode_addr_const (t2
, &value2
);
2943 if (value1
.offset
!= value2
.offset
)
2946 code
= GET_CODE (value1
.base
);
2947 if (code
!= GET_CODE (value2
.base
))
2953 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2957 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
2958 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
2968 case POINTER_PLUS_EXPR
:
2971 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2972 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2975 case VIEW_CONVERT_EXPR
:
2976 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2985 /* Make a copy of the whole tree structure for a constant. This
2986 handles the same types of nodes that compare_constant handles. */
2989 copy_constant (tree exp
)
2991 switch (TREE_CODE (exp
))
2994 /* For ADDR_EXPR, we do not want to copy the decl whose address
2995 is requested. We do want to copy constants though. */
2996 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2997 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2998 copy_constant (TREE_OPERAND (exp
, 0)));
3000 return copy_node (exp
);
3006 return copy_node (exp
);
3009 return build_complex (TREE_TYPE (exp
),
3010 copy_constant (TREE_REALPART (exp
)),
3011 copy_constant (TREE_IMAGPART (exp
)));
3014 case POINTER_PLUS_EXPR
:
3016 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3017 copy_constant (TREE_OPERAND (exp
, 0)),
3018 copy_constant (TREE_OPERAND (exp
, 1)));
3021 case VIEW_CONVERT_EXPR
:
3022 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3023 copy_constant (TREE_OPERAND (exp
, 0)));
3026 return build_vector (TREE_TYPE (exp
), VECTOR_CST_ELTS (exp
));
3030 tree copy
= copy_node (exp
);
3031 vec
<constructor_elt
, va_gc
> *v
;
3032 unsigned HOST_WIDE_INT idx
;
3033 tree purpose
, value
;
3035 vec_alloc (v
, vec_safe_length (CONSTRUCTOR_ELTS (exp
)));
3036 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3038 constructor_elt ce
= {purpose
, copy_constant (value
)};
3041 CONSTRUCTOR_ELTS (copy
) = v
;
3050 /* Return the section into which constant EXP should be placed. */
3053 get_constant_section (tree exp
, unsigned int align
)
3055 return targetm
.asm_out
.select_section (exp
,
3056 compute_reloc_for_constant (exp
),
3060 /* Return the size of constant EXP in bytes. */
3062 static HOST_WIDE_INT
3063 get_constant_size (tree exp
)
3067 size
= int_size_in_bytes (TREE_TYPE (exp
));
3068 if (TREE_CODE (exp
) == STRING_CST
)
3069 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3073 /* Subroutine of output_constant_def:
3074 No constant equal to EXP is known to have been output.
3075 Make a constant descriptor to enter EXP in the hash table.
3076 Assign the label number and construct RTL to refer to the
3077 constant's location in memory.
3078 Caller is responsible for updating the hash table. */
3080 static struct constant_descriptor_tree
*
3081 build_constant_desc (tree exp
)
3083 struct constant_descriptor_tree
*desc
;
3089 desc
= ggc_alloc_constant_descriptor_tree ();
3090 desc
->value
= copy_constant (exp
);
3092 /* Propagate marked-ness to copied constant. */
3093 if (flag_mudflap
&& mf_marked_p (exp
))
3094 mf_mark (desc
->value
);
3096 /* Create a string containing the label name, in LABEL. */
3097 labelno
= const_labelno
++;
3098 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3100 /* Construct the VAR_DECL associated with the constant. */
3101 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3103 DECL_ARTIFICIAL (decl
) = 1;
3104 DECL_IGNORED_P (decl
) = 1;
3105 TREE_READONLY (decl
) = 1;
3106 TREE_STATIC (decl
) = 1;
3107 TREE_ADDRESSABLE (decl
) = 1;
3108 /* We don't set the RTL yet as this would cause varpool to assume that the
3109 variable is referenced. Moreover, it would just be dropped in LTO mode.
3110 Instead we set the flag that will be recognized in make_decl_rtl. */
3111 DECL_IN_CONSTANT_POOL (decl
) = 1;
3112 DECL_INITIAL (decl
) = desc
->value
;
3113 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3114 architectures so use DATA_ALIGNMENT as well, except for strings. */
3115 if (TREE_CODE (exp
) == STRING_CST
)
3117 #ifdef CONSTANT_ALIGNMENT
3118 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3122 align_variable (decl
, 0);
3124 /* Now construct the SYMBOL_REF and the MEM. */
3125 if (use_object_blocks_p ())
3127 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3128 symbol
= create_block_symbol (ggc_strdup (label
),
3129 get_block_for_section (sect
), -1);
3132 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3133 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3134 SET_SYMBOL_REF_DECL (symbol
, decl
);
3135 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3137 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3138 set_mem_attributes (rtl
, exp
, 1);
3139 set_mem_alias_set (rtl
, 0);
3140 set_mem_alias_set (rtl
, const_alias_set
);
3142 /* We cannot share RTX'es in pool entries.
3143 Mark this piece of RTL as required for unsharing. */
3144 RTX_FLAG (rtl
, used
) = 1;
3146 /* Set flags or add text to the name to record information, such as
3147 that it is a local symbol. If the name is changed, the macro
3148 ASM_OUTPUT_LABELREF will have to know how to strip this
3149 information. This call might invalidate our local variable
3150 SYMBOL; we can't use it afterward. */
3151 targetm
.encode_section_info (exp
, rtl
, true);
3158 /* Return an rtx representing a reference to constant data in memory
3159 for the constant expression EXP.
3161 If assembler code for such a constant has already been output,
3162 return an rtx to refer to it.
3163 Otherwise, output such a constant in memory
3164 and generate an rtx for it.
3166 If DEFER is nonzero, this constant can be deferred and output only
3167 if referenced in the function after all optimizations.
3169 `const_desc_table' records which constants already have label strings. */
3172 output_constant_def (tree exp
, int defer
)
3174 struct constant_descriptor_tree
*desc
;
3175 struct constant_descriptor_tree key
;
3178 /* Look up EXP in the table of constant descriptors. If we didn't find
3179 it, create a new one. */
3181 key
.hash
= const_hash_1 (exp
);
3182 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3184 desc
= (struct constant_descriptor_tree
*) *loc
;
3187 desc
= build_constant_desc (exp
);
3188 desc
->hash
= key
.hash
;
3192 maybe_output_constant_def_contents (desc
, defer
);
3196 /* Subroutine of output_constant_def: Decide whether or not we need to
3197 output the constant DESC now, and if so, do it. */
3199 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3202 rtx symbol
= XEXP (desc
->rtl
, 0);
3203 tree exp
= desc
->value
;
3205 if (flag_syntax_only
)
3208 if (TREE_ASM_WRITTEN (exp
))
3209 /* Already output; don't do it again. */
3212 /* We can always defer constants as long as the context allows
3216 /* Increment n_deferred_constants if it exists. It needs to be at
3217 least as large as the number of constants actually referred to
3218 by the function. If it's too small we'll stop looking too early
3219 and fail to emit constants; if it's too large we'll only look
3220 through the entire function when we could have stopped earlier. */
3222 n_deferred_constants
++;
3226 output_constant_def_contents (symbol
);
3229 /* Subroutine of output_constant_def_contents. Output the definition
3230 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3231 constant's alignment in bits. */
3234 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3238 size
= get_constant_size (exp
);
3240 /* Do any machine/system dependent processing of the constant. */
3241 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3243 /* Output the value of EXP. */
3244 output_constant (exp
, size
, align
);
3247 /* We must output the constant data referred to by SYMBOL; do so. */
3250 output_constant_def_contents (rtx symbol
)
3252 tree decl
= SYMBOL_REF_DECL (symbol
);
3253 tree exp
= DECL_INITIAL (decl
);
3255 bool asan_protected
= false;
3257 /* Make sure any other constants whose addresses appear in EXP
3258 are assigned label numbers. */
3259 output_addressed_constants (exp
);
3261 /* We are no longer deferring this constant. */
3262 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3264 if (flag_asan
&& TREE_CODE (exp
) == STRING_CST
3265 && asan_protect_global (exp
))
3267 asan_protected
= true;
3268 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3269 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3272 /* If the constant is part of an object block, make sure that the
3273 decl has been positioned within its block, but do not write out
3274 its definition yet. output_object_blocks will do that later. */
3275 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3276 place_block_symbol (symbol
);
3279 align
= DECL_ALIGN (decl
);
3280 switch_to_section (get_constant_section (exp
, align
));
3281 if (align
> BITS_PER_UNIT
)
3282 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3283 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3286 HOST_WIDE_INT size
= get_constant_size (exp
);
3287 assemble_zeros (asan_red_zone_size (size
));
3291 mudflap_enqueue_constant (exp
);
3294 /* Look up EXP in the table of constant descriptors. Return the rtl
3295 if it has been emitted, else null. */
3298 lookup_constant_def (tree exp
)
3300 struct constant_descriptor_tree
*desc
;
3301 struct constant_descriptor_tree key
;
3304 key
.hash
= const_hash_1 (exp
);
3305 desc
= (struct constant_descriptor_tree
*)
3306 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3308 return (desc
? desc
->rtl
: NULL_RTX
);
3311 /* Return a tree representing a reference to constant data in memory
3312 for the constant expression EXP.
3314 This is the counterpart of output_constant_def at the Tree level. */
3317 tree_output_constant_def (tree exp
)
3319 struct constant_descriptor_tree
*desc
, key
;
3323 /* Look up EXP in the table of constant descriptors. If we didn't find
3324 it, create a new one. */
3326 key
.hash
= const_hash_1 (exp
);
3327 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3329 desc
= (struct constant_descriptor_tree
*) *loc
;
3332 desc
= build_constant_desc (exp
);
3333 desc
->hash
= key
.hash
;
3337 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3338 varpool_finalize_decl (decl
);
3342 /* Used in the hash tables to avoid outputting the same constant
3343 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3344 are output once per function, not once per file. */
3345 /* ??? Only a few targets need per-function constant pools. Most
3346 can use one per-file pool. Should add a targetm bit to tell the
3349 struct GTY(()) rtx_constant_pool
{
3350 /* Pointers to first and last constant in pool, as ordered by offset. */
3351 struct constant_descriptor_rtx
*first
;
3352 struct constant_descriptor_rtx
*last
;
3354 /* Hash facility for making memory-constants from constant rtl-expressions.
3355 It is used on RISC machines where immediate integer arguments and
3356 constant addresses are restricted so that such constants must be stored
3358 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3360 /* Current offset in constant pool (does not include any
3361 machine-specific header). */
3362 HOST_WIDE_INT offset
;
3365 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3366 struct constant_descriptor_rtx
*next
;
3370 HOST_WIDE_INT offset
;
3372 enum machine_mode mode
;
3378 /* Hash and compare functions for const_rtx_htab. */
3381 const_desc_rtx_hash (const void *ptr
)
3383 const struct constant_descriptor_rtx
*const desc
3384 = (const struct constant_descriptor_rtx
*) ptr
;
3389 const_desc_rtx_eq (const void *a
, const void *b
)
3391 const struct constant_descriptor_rtx
*const x
3392 = (const struct constant_descriptor_rtx
*) a
;
3393 const struct constant_descriptor_rtx
*const y
3394 = (const struct constant_descriptor_rtx
*) b
;
3396 if (x
->mode
!= y
->mode
)
3398 return rtx_equal_p (x
->constant
, y
->constant
);
3401 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3404 const_rtx_hash_1 (rtx
*xp
, void *data
)
3406 unsigned HOST_WIDE_INT hwi
;
3407 enum machine_mode mode
;
3413 code
= GET_CODE (x
);
3414 mode
= GET_MODE (x
);
3415 h
= (hashval_t
) code
* 1048573 + mode
;
3423 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3424 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3427 h
^= (hashval_t
) hwi
;
3428 for (i
= 1; i
< n
; ++i
)
3431 h
^= (hashval_t
) hwi
;
3437 if (mode
== VOIDmode
)
3439 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3443 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3447 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3453 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3454 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3459 h
^= htab_hash_string (XSTR (x
, 0));
3463 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3467 case UNSPEC_VOLATILE
:
3468 h
= h
* 251 + XINT (x
, 1);
3475 hp
= (hashval_t
*) data
;
3476 *hp
= *hp
* 509 + h
;
3480 /* Compute a hash value for X, which should be a constant. */
3483 const_rtx_hash (rtx x
)
3486 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3491 /* Create and return a new rtx constant pool. */
3493 static struct rtx_constant_pool
*
3494 create_constant_pool (void)
3496 struct rtx_constant_pool
*pool
;
3498 pool
= ggc_alloc_rtx_constant_pool ();
3499 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3500 const_desc_rtx_eq
, NULL
);
3507 /* Initialize constant pool hashing for a new function. */
3510 init_varasm_status (void)
3512 crtl
->varasm
.pool
= create_constant_pool ();
3513 crtl
->varasm
.deferred_constants
= 0;
3516 /* Given a MINUS expression, simplify it if both sides
3517 include the same symbol. */
3520 simplify_subtraction (rtx x
)
3522 rtx r
= simplify_rtx (x
);
3526 /* Given a constant rtx X, make (or find) a memory constant for its value
3527 and return a MEM rtx to refer to it in memory. */
3530 force_const_mem (enum machine_mode mode
, rtx x
)
3532 struct constant_descriptor_rtx
*desc
, tmp
;
3533 struct rtx_constant_pool
*pool
;
3540 /* If we're not allowed to drop X into the constant pool, don't. */
3541 if (targetm
.cannot_force_const_mem (mode
, x
))
3544 /* Record that this function has used a constant pool entry. */
3545 crtl
->uses_const_pool
= 1;
3547 /* Decide which pool to use. */
3548 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3549 ? shared_constant_pool
3550 : crtl
->varasm
.pool
);
3552 /* Lookup the value in the hashtable. */
3555 hash
= const_rtx_hash (x
);
3556 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3557 desc
= (struct constant_descriptor_rtx
*) *slot
;
3559 /* If the constant was already present, return its memory. */
3561 return copy_rtx (desc
->mem
);
3563 /* Otherwise, create a new descriptor. */
3564 desc
= ggc_alloc_constant_descriptor_rtx ();
3567 /* Align the location counter as required by EXP's data type. */
3568 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3569 #ifdef CONSTANT_ALIGNMENT
3571 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3572 if (type
!= NULL_TREE
)
3573 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3577 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3578 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3581 desc
->constant
= copy_rtx (tmp
.constant
);
3582 desc
->offset
= pool
->offset
;
3585 desc
->align
= align
;
3586 desc
->labelno
= const_labelno
;
3589 pool
->offset
+= GET_MODE_SIZE (mode
);
3591 pool
->last
->next
= desc
;
3593 pool
->first
= pool
->last
= desc
;
3596 /* Create a string containing the label name, in LABEL. */
3597 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3600 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3601 the constants pool. */
3602 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3604 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3605 symbol
= create_block_symbol (ggc_strdup (label
),
3606 get_block_for_section (sect
), -1);
3609 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3611 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3612 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3613 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3615 /* Construct the MEM. */
3616 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3617 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3618 set_mem_align (def
, align
);
3620 /* If we're dropping a label to the constant pool, make sure we
3622 if (GET_CODE (x
) == LABEL_REF
)
3623 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3625 return copy_rtx (def
);
3628 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3631 get_pool_constant (rtx addr
)
3633 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3636 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3637 and whether it has been output or not. */
3640 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3642 struct constant_descriptor_rtx
*desc
;
3644 desc
= SYMBOL_REF_CONSTANT (addr
);
3645 *pmarked
= (desc
->mark
!= 0);
3646 return desc
->constant
;
3649 /* Similar, return the mode. */
3652 get_pool_mode (const_rtx addr
)
3654 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3657 /* Return the size of the constant pool. */
3660 get_pool_size (void)
3662 return crtl
->varasm
.pool
->offset
;
3665 /* Worker function for output_constant_pool_1. Emit assembly for X
3666 in MODE with known alignment ALIGN. */
3669 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3671 switch (GET_MODE_CLASS (mode
))
3674 case MODE_DECIMAL_FLOAT
:
3678 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3679 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3680 assemble_real (r
, mode
, align
);
3685 case MODE_PARTIAL_INT
:
3690 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3693 case MODE_VECTOR_FLOAT
:
3694 case MODE_VECTOR_INT
:
3695 case MODE_VECTOR_FRACT
:
3696 case MODE_VECTOR_UFRACT
:
3697 case MODE_VECTOR_ACCUM
:
3698 case MODE_VECTOR_UACCUM
:
3701 enum machine_mode submode
= GET_MODE_INNER (mode
);
3702 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3704 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3705 units
= CONST_VECTOR_NUNITS (x
);
3707 for (i
= 0; i
< units
; i
++)
3709 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3710 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3720 /* Worker function for output_constant_pool. Emit constant DESC,
3721 giving it ALIGN bits of alignment. */
3724 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3731 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3732 whose CODE_LABEL has been deleted. This can occur if a jump table
3733 is eliminated by optimization. If so, write a constant of zero
3734 instead. Note that this can also happen by turning the
3735 CODE_LABEL into a NOTE. */
3736 /* ??? This seems completely and utterly wrong. Certainly it's
3737 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3738 functioning even with INSN_DELETED_P and friends. */
3741 switch (GET_CODE (tmp
))
3744 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3745 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3747 tmp
= XEXP (XEXP (tmp
, 0), 0);
3751 tmp
= XEXP (tmp
, 0);
3752 gcc_assert (!INSN_DELETED_P (tmp
));
3753 gcc_assert (!NOTE_P (tmp
)
3754 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3761 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3762 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3763 align
, desc
->labelno
, done
);
3766 assemble_align (align
);
3768 /* Output the label. */
3769 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3771 /* Output the data. */
3772 output_constant_pool_2 (desc
->mode
, x
, align
);
3774 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3775 sections have proper size. */
3776 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3778 && (in_section
->common
.flags
& SECTION_MERGE
))
3779 assemble_align (align
);
3781 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3787 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3788 to as used. Emit referenced deferred strings. This function can
3789 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3792 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3794 rtx x
= *current_rtx
;
3796 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3799 if (CONSTANT_POOL_ADDRESS_P (x
))
3801 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3802 if (desc
->mark
== 0)
3805 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3808 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3810 tree decl
= SYMBOL_REF_DECL (x
);
3811 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3813 n_deferred_constants
--;
3814 output_constant_def_contents (x
);
3821 /* Look through appropriate parts of INSN, marking all entries in the
3822 constant pool which are actually being used. Entries that are only
3823 referenced by other constants are also marked as used. Emit
3824 deferred strings that are used. */
3827 mark_constants (rtx insn
)
3832 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3833 insns, not any notes that may be attached. We don't want to mark
3834 a constant just because it happens to appear in a REG_EQUIV note. */
3835 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3837 rtx seq
= PATTERN (insn
);
3838 int i
, n
= XVECLEN (seq
, 0);
3839 for (i
= 0; i
< n
; ++i
)
3841 rtx subinsn
= XVECEXP (seq
, 0, i
);
3842 if (INSN_P (subinsn
))
3843 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3847 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3850 /* Look through the instructions for this function, and mark all the
3851 entries in POOL which are actually being used. Emit deferred constants
3852 which have indeed been used. */
3855 mark_constant_pool (void)
3859 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3862 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3863 mark_constants (insn
);
3866 /* Write all the constants in POOL. */
3869 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3871 struct constant_descriptor_rtx
*desc
;
3873 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3876 /* If the constant is part of an object_block, make sure that
3877 the constant has been positioned within its block, but do not
3878 write out its definition yet. output_object_blocks will do
3880 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3881 && SYMBOL_REF_BLOCK (desc
->sym
))
3882 place_block_symbol (desc
->sym
);
3885 switch_to_section (targetm
.asm_out
.select_rtx_section
3886 (desc
->mode
, desc
->constant
, desc
->align
));
3887 output_constant_pool_1 (desc
, desc
->align
);
3892 /* Mark all constants that are used in the current function, then write
3893 out the function's private constant pool. */
3896 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3897 tree fndecl ATTRIBUTE_UNUSED
)
3899 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3901 /* It is possible for gcc to call force_const_mem and then to later
3902 discard the instructions which refer to the constant. In such a
3903 case we do not need to output the constant. */
3904 mark_constant_pool ();
3906 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3907 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3910 output_constant_pool_contents (pool
);
3912 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3913 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3917 /* Write the contents of the shared constant pool. */
3920 output_shared_constant_pool (void)
3922 output_constant_pool_contents (shared_constant_pool
);
3925 /* Determine what kind of relocations EXP may need. */
3928 compute_reloc_for_constant (tree exp
)
3930 int reloc
= 0, reloc2
;
3933 switch (TREE_CODE (exp
))
3937 /* Go inside any operations that get_inner_reference can handle and see
3938 if what's inside is a constant: no need to do anything here for
3939 addresses of variables or functions. */
3940 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3941 tem
= TREE_OPERAND (tem
, 0))
3944 if (TREE_CODE (tem
) == MEM_REF
3945 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
3947 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
3951 if (TREE_PUBLIC (tem
))
3958 case POINTER_PLUS_EXPR
:
3959 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3960 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3964 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3965 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3966 /* The difference of two local labels is computable at link time. */
3967 if (reloc
== 1 && reloc2
== 1)
3974 case VIEW_CONVERT_EXPR
:
3975 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3980 unsigned HOST_WIDE_INT idx
;
3981 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3983 reloc
|= compute_reloc_for_constant (tem
);
3993 /* Find all the constants whose addresses are referenced inside of EXP,
3994 and make sure assembler code with a label has been output for each one.
3995 Indicate whether an ADDR_EXPR has been encountered. */
3998 output_addressed_constants (tree exp
)
4002 switch (TREE_CODE (exp
))
4006 /* Go inside any operations that get_inner_reference can handle and see
4007 if what's inside is a constant: no need to do anything here for
4008 addresses of variables or functions. */
4009 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4010 tem
= TREE_OPERAND (tem
, 0))
4013 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4014 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4015 tem
= DECL_INITIAL (tem
);
4017 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4018 output_constant_def (tem
, 0);
4020 if (TREE_CODE (tem
) == MEM_REF
)
4021 output_addressed_constants (TREE_OPERAND (tem
, 0));
4025 case POINTER_PLUS_EXPR
:
4027 output_addressed_constants (TREE_OPERAND (exp
, 1));
4031 case VIEW_CONVERT_EXPR
:
4032 output_addressed_constants (TREE_OPERAND (exp
, 0));
4037 unsigned HOST_WIDE_INT idx
;
4038 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4040 output_addressed_constants (tem
);
4049 /* Whether a constructor CTOR is a valid static constant initializer if all
4050 its elements are. This used to be internal to initializer_constant_valid_p
4051 and has been exposed to let other functions like categorize_ctor_elements
4052 evaluate the property while walking a constructor for other purposes. */
4055 constructor_static_from_elts_p (const_tree ctor
)
4057 return (TREE_CONSTANT (ctor
)
4058 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4059 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4060 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4063 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4066 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4067 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4068 which are valid when ENDTYPE is an integer of any size; in
4069 particular, this does not accept a pointer minus a constant. This
4070 returns null_pointer_node if the VALUE is an absolute constant
4071 which can be used to initialize a static variable. Otherwise it
4075 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4079 if (!INTEGRAL_TYPE_P (endtype
))
4082 op0
= TREE_OPERAND (value
, 0);
4083 op1
= TREE_OPERAND (value
, 1);
4085 /* Like STRIP_NOPS except allow the operand mode to widen. This
4086 works around a feature of fold that simplifies (int)(p1 - p2) to
4087 ((int)p1 - (int)p2) under the theory that the narrower operation
4090 while (CONVERT_EXPR_P (op0
)
4091 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4093 tree inner
= TREE_OPERAND (op0
, 0);
4094 if (inner
== error_mark_node
4095 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4096 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4097 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4102 while (CONVERT_EXPR_P (op1
)
4103 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4105 tree inner
= TREE_OPERAND (op1
, 0);
4106 if (inner
== error_mark_node
4107 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4108 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4109 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4114 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4118 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4119 cache
? cache
+ 2 : NULL
);
4120 /* Both initializers must be known. */
4124 && (op0
== null_pointer_node
4125 || TREE_CODE (value
) == MINUS_EXPR
))
4126 return null_pointer_node
;
4128 /* Support differences between labels. */
4129 if (TREE_CODE (op0
) == LABEL_DECL
4130 && TREE_CODE (op1
) == LABEL_DECL
)
4131 return null_pointer_node
;
4133 if (TREE_CODE (op0
) == STRING_CST
4134 && TREE_CODE (op1
) == STRING_CST
4135 && operand_equal_p (op0
, op1
, 1))
4136 return null_pointer_node
;
4142 /* Helper function of initializer_constant_valid_p.
4143 Return nonzero if VALUE is a valid constant-valued expression
4144 for use in initializing a static variable; one that can be an
4145 element of a "constant" initializer.
4147 Return null_pointer_node if the value is absolute;
4148 if it is relocatable, return the variable that determines the relocation.
4149 We assume that VALUE has been folded as much as possible;
4150 therefore, we do not need to check for such things as
4151 arithmetic-combinations of integers.
4153 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4156 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4160 switch (TREE_CODE (value
))
4163 if (constructor_static_from_elts_p (value
))
4165 unsigned HOST_WIDE_INT idx
;
4167 bool absolute
= true;
4169 if (cache
&& cache
[0] == value
)
4171 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4174 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4181 cache
[1] = NULL_TREE
;
4185 if (reloc
!= null_pointer_node
)
4188 /* For a non-absolute relocation, there is no single
4189 variable that can be "the variable that determines the
4194 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4196 return absolute
? null_pointer_node
: error_mark_node
;
4199 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4207 return null_pointer_node
;
4212 tree op0
= staticp (TREE_OPERAND (value
, 0));
4215 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4216 to be a constant, this is old-skool offsetof-like nonsense. */
4217 if (TREE_CODE (op0
) == INDIRECT_REF
4218 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4219 return null_pointer_node
;
4220 /* Taking the address of a nested function involves a trampoline,
4221 unless we don't need or want one. */
4222 if (TREE_CODE (op0
) == FUNCTION_DECL
4223 && DECL_STATIC_CHAIN (op0
)
4224 && !TREE_NO_TRAMPOLINE (value
))
4226 /* "&{...}" requires a temporary to hold the constructed
4228 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4234 case NON_LVALUE_EXPR
:
4235 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4238 case VIEW_CONVERT_EXPR
:
4240 tree src
= TREE_OPERAND (value
, 0);
4241 tree src_type
= TREE_TYPE (src
);
4242 tree dest_type
= TREE_TYPE (value
);
4244 /* Allow view-conversions from aggregate to non-aggregate type only
4245 if the bit pattern is fully preserved afterwards; otherwise, the
4246 RTL expander won't be able to apply a subsequent transformation
4247 to the underlying constructor. */
4248 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4250 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4251 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4256 /* Allow all other kinds of view-conversion. */
4257 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4262 tree src
= TREE_OPERAND (value
, 0);
4263 tree src_type
= TREE_TYPE (src
);
4264 tree dest_type
= TREE_TYPE (value
);
4266 /* Allow conversions between pointer types, floating-point
4267 types, and offset types. */
4268 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4269 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4270 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4271 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4272 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4274 /* Allow length-preserving conversions between integer types. */
4275 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4276 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4277 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4279 /* Allow conversions between other integer types only if
4281 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4283 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4284 if (inner
== null_pointer_node
)
4285 return null_pointer_node
;
4289 /* Allow (int) &foo provided int is as wide as a pointer. */
4290 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4291 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4292 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4294 /* Likewise conversions from int to pointers, but also allow
4295 conversions from 0. */
4296 if ((POINTER_TYPE_P (dest_type
)
4297 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4298 && INTEGRAL_TYPE_P (src_type
))
4300 if (TREE_CODE (src
) == INTEGER_CST
4301 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4302 return null_pointer_node
;
4303 if (integer_zerop (src
))
4304 return null_pointer_node
;
4305 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4306 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4309 /* Allow conversions to struct or union types if the value
4311 if (TREE_CODE (dest_type
) == RECORD_TYPE
4312 || TREE_CODE (dest_type
) == UNION_TYPE
)
4313 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4317 case POINTER_PLUS_EXPR
:
4319 /* Any valid floating-point constants will have been folded by now;
4320 with -frounding-math we hit this with addition of two constants. */
4321 if (TREE_CODE (endtype
) == REAL_TYPE
)
4323 if (cache
&& cache
[0] == value
)
4325 if (! INTEGRAL_TYPE_P (endtype
)
4326 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4328 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4330 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4333 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4334 endtype
, ncache
+ 2);
4335 /* If either term is absolute, use the other term's relocation. */
4336 if (valid0
== null_pointer_node
)
4338 else if (valid1
== null_pointer_node
)
4340 /* Support narrowing pointer differences. */
4342 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4346 /* Support narrowing pointer differences. */
4347 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4356 if (TREE_CODE (endtype
) == REAL_TYPE
)
4358 if (cache
&& cache
[0] == value
)
4360 if (! INTEGRAL_TYPE_P (endtype
)
4361 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4363 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4365 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4368 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4369 endtype
, ncache
+ 2);
4370 /* Win if second argument is absolute. */
4371 if (valid1
== null_pointer_node
)
4373 /* Win if both arguments have the same relocation.
4374 Then the value is absolute. */
4375 else if (valid0
== valid1
&& valid0
!= 0)
4376 ret
= null_pointer_node
;
4377 /* Since GCC guarantees that string constants are unique in the
4378 generated code, a subtraction between two copies of the same
4379 constant string is absolute. */
4380 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4381 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4382 && operand_equal_p (valid0
, valid1
, 1))
4383 ret
= null_pointer_node
;
4384 /* Support narrowing differences. */
4386 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4390 /* Support narrowing differences. */
4391 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4406 /* Return nonzero if VALUE is a valid constant-valued expression
4407 for use in initializing a static variable; one that can be an
4408 element of a "constant" initializer.
4410 Return null_pointer_node if the value is absolute;
4411 if it is relocatable, return the variable that determines the relocation.
4412 We assume that VALUE has been folded as much as possible;
4413 therefore, we do not need to check for such things as
4414 arithmetic-combinations of integers. */
4416 initializer_constant_valid_p (tree value
, tree endtype
)
4418 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4421 /* Return true if VALUE is a valid constant-valued expression
4422 for use in initializing a static bit-field; one that can be
4423 an element of a "constant" initializer. */
4426 initializer_constant_valid_for_bitfield_p (tree value
)
4428 /* For bitfields we support integer constants or possibly nested aggregates
4430 switch (TREE_CODE (value
))
4434 unsigned HOST_WIDE_INT idx
;
4437 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4438 if (!initializer_constant_valid_for_bitfield_p (elt
))
4447 case VIEW_CONVERT_EXPR
:
4448 case NON_LVALUE_EXPR
:
4450 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4459 /* output_constructor outer state of relevance in recursive calls, typically
4460 for nested aggregate bitfields. */
4463 unsigned int bit_offset
; /* current position in ... */
4464 int byte
; /* ... the outer byte buffer. */
4467 static unsigned HOST_WIDE_INT
4468 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4471 /* Output assembler code for constant EXP to FILE, with no label.
4472 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4473 Assumes output_addressed_constants has been done on EXP already.
4475 Generate exactly SIZE bytes of assembler data, padding at the end
4476 with zeros if necessary. SIZE must always be specified.
4478 SIZE is important for structure constructors,
4479 since trailing members may have been omitted from the constructor.
4480 It is also important for initialization of arrays from string constants
4481 since the full length of the string constant might not be wanted.
4482 It is also needed for initialization of unions, where the initializer's
4483 type is just one member, and that may not be as long as the union.
4485 There a case in which we would fail to output exactly SIZE bytes:
4486 for a structure constructor that wants to produce more than SIZE bytes.
4487 But such constructors will never be generated for any possible input.
4489 ALIGN is the alignment of the data in bits. */
4492 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4494 enum tree_code code
;
4495 unsigned HOST_WIDE_INT thissize
;
4497 if (size
== 0 || flag_syntax_only
)
4500 /* See if we're trying to initialize a pointer in a non-default mode
4501 to the address of some declaration somewhere. If the target says
4502 the mode is valid for pointers, assume the target has a way of
4504 if (TREE_CODE (exp
) == NOP_EXPR
4505 && POINTER_TYPE_P (TREE_TYPE (exp
))
4506 && targetm
.addr_space
.valid_pointer_mode
4507 (TYPE_MODE (TREE_TYPE (exp
)),
4508 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4510 tree saved_type
= TREE_TYPE (exp
);
4512 /* Peel off any intermediate conversions-to-pointer for valid
4514 while (TREE_CODE (exp
) == NOP_EXPR
4515 && POINTER_TYPE_P (TREE_TYPE (exp
))
4516 && targetm
.addr_space
.valid_pointer_mode
4517 (TYPE_MODE (TREE_TYPE (exp
)),
4518 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4519 exp
= TREE_OPERAND (exp
, 0);
4521 /* If what we're left with is the address of something, we can
4522 convert the address to the final type and output it that
4524 if (TREE_CODE (exp
) == ADDR_EXPR
)
4525 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4526 /* Likewise for constant ints. */
4527 else if (TREE_CODE (exp
) == INTEGER_CST
)
4528 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4529 TREE_INT_CST_HIGH (exp
));
4533 /* Eliminate any conversions since we'll be outputting the underlying
4535 while (CONVERT_EXPR_P (exp
)
4536 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4537 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4539 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4540 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4542 /* Make sure eliminating the conversion is really a no-op, except with
4543 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4544 union types to allow for Ada unchecked unions. */
4545 if (type_size
> op_size
4546 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4547 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4548 /* Keep the conversion. */
4551 exp
= TREE_OPERAND (exp
, 0);
4554 code
= TREE_CODE (TREE_TYPE (exp
));
4555 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4557 /* Allow a constructor with no elements for any data type.
4558 This means to fill the space with zeros. */
4559 if (TREE_CODE (exp
) == CONSTRUCTOR
4560 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4562 assemble_zeros (size
);
4566 if (TREE_CODE (exp
) == FDESC_EXPR
)
4568 #ifdef ASM_OUTPUT_FDESC
4569 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4570 tree decl
= TREE_OPERAND (exp
, 0);
4571 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4578 /* Now output the underlying data. If we've handling the padding, return.
4579 Otherwise, break and ensure SIZE is the size written. */
4586 case REFERENCE_TYPE
:
4588 case FIXED_POINT_TYPE
:
4589 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4590 EXPAND_INITIALIZER
),
4591 MIN (size
, thissize
), align
, 0))
4592 error ("initializer for integer/fixed-point value is too complicated");
4596 if (TREE_CODE (exp
) != REAL_CST
)
4597 error ("initializer for floating value is not a floating constant");
4599 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4603 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4604 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4605 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4610 switch (TREE_CODE (exp
))
4613 output_constructor (exp
, size
, align
, NULL
);
4616 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4618 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4624 unsigned int i
, nalign
;
4625 enum machine_mode inner
;
4627 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4628 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4630 elt_size
= GET_MODE_SIZE (inner
);
4632 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4633 thissize
= elt_size
;
4634 for (i
= 1; i
< VECTOR_CST_NELTS (exp
); ++i
)
4636 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4637 thissize
+= elt_size
;
4648 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4649 output_constructor (exp
, size
, align
, NULL
);
4659 if (size
> thissize
)
4660 assemble_zeros (size
- thissize
);
4664 /* Subroutine of output_constructor, used for computing the size of
4665 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4666 type with an unspecified upper bound. */
4668 static unsigned HOST_WIDE_INT
4669 array_size_for_constructor (tree val
)
4672 unsigned HOST_WIDE_INT cnt
;
4673 tree index
, value
, tmp
;
4676 /* This code used to attempt to handle string constants that are not
4677 arrays of single-bytes, but nothing else does, so there's no point in
4679 if (TREE_CODE (val
) == STRING_CST
)
4680 return TREE_STRING_LENGTH (val
);
4682 max_index
= NULL_TREE
;
4683 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4685 if (TREE_CODE (index
) == RANGE_EXPR
)
4686 index
= TREE_OPERAND (index
, 1);
4687 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4691 if (max_index
== NULL_TREE
)
4694 /* Compute the total number of array elements. */
4695 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4696 i
= tree_to_double_int (max_index
) - tree_to_double_int (tmp
);
4697 i
+= double_int_one
;
4699 /* Multiply by the array element unit size to find number of bytes. */
4700 i
*= tree_to_double_int (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4702 gcc_assert (i
.fits_uhwi ());
4706 /* Other datastructures + helpers for output_constructor. */
4708 /* output_constructor local state to support interaction with helpers. */
4712 /* Received arguments. */
4713 tree exp
; /* Constructor expression. */
4714 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4715 unsigned int align
; /* Known initial alignment. */
4717 /* Constructor expression data. */
4718 tree type
; /* Expression type. */
4719 tree field
; /* Current field decl in a record. */
4720 tree min_index
; /* Lower bound if specified for an array. */
4722 /* Output processing state. */
4723 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4724 bool byte_buffer_in_use
; /* Whether byte ... */
4725 int byte
; /* ... contains part of a bitfield byte yet to
4728 int last_relative_index
; /* Implicit or explicit index of the last
4729 array element output within a bitfield. */
4730 /* Current element. */
4731 tree val
; /* Current element value. */
4732 tree index
; /* Current element index. */
4736 /* Helper for output_constructor. From the current LOCAL state, output a
4737 RANGE_EXPR element. */
4740 output_constructor_array_range (oc_local_state
*local
)
4742 unsigned HOST_WIDE_INT fieldsize
4743 = int_size_in_bytes (TREE_TYPE (local
->type
));
4745 HOST_WIDE_INT lo_index
4746 = tree_low_cst (TREE_OPERAND (local
->index
, 0), 0);
4747 HOST_WIDE_INT hi_index
4748 = tree_low_cst (TREE_OPERAND (local
->index
, 1), 0);
4749 HOST_WIDE_INT index
;
4752 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4754 for (index
= lo_index
; index
<= hi_index
; index
++)
4756 /* Output the element's initial value. */
4757 if (local
->val
== NULL_TREE
)
4758 assemble_zeros (fieldsize
);
4760 output_constant (local
->val
, fieldsize
, align2
);
4762 /* Count its size. */
4763 local
->total_bytes
+= fieldsize
;
4767 /* Helper for output_constructor. From the current LOCAL state, output a
4768 field element that is not true bitfield or part of an outer one. */
4771 output_constructor_regular_field (oc_local_state
*local
)
4773 /* Field size and position. Since this structure is static, we know the
4774 positions are constant. */
4775 unsigned HOST_WIDE_INT fieldsize
;
4776 HOST_WIDE_INT fieldpos
;
4778 unsigned int align2
;
4780 if (local
->index
!= NULL_TREE
)
4782 /* Perform the index calculation in modulo arithmetic but
4783 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4784 but we are using an unsigned sizetype. */
4785 unsigned prec
= TYPE_PRECISION (sizetype
);
4786 double_int idx
= tree_to_double_int (local
->index
)
4787 - tree_to_double_int (local
->min_index
);
4788 idx
= idx
.sext (prec
);
4789 fieldpos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)), 1)
4792 else if (local
->field
!= NULL_TREE
)
4793 fieldpos
= int_byte_position (local
->field
);
4797 /* Output any buffered-up bit-fields preceding this element. */
4798 if (local
->byte_buffer_in_use
)
4800 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4801 local
->total_bytes
++;
4802 local
->byte_buffer_in_use
= false;
4805 /* Advance to offset of this element.
4806 Note no alignment needed in an array, since that is guaranteed
4807 if each element has the proper size. */
4808 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4809 && fieldpos
!= local
->total_bytes
)
4811 gcc_assert (fieldpos
>= local
->total_bytes
);
4812 assemble_zeros (fieldpos
- local
->total_bytes
);
4813 local
->total_bytes
= fieldpos
;
4816 /* Find the alignment of this element. */
4817 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4819 /* Determine size this element should occupy. */
4824 /* If this is an array with an unspecified upper bound,
4825 the initializer determines the size. */
4826 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4827 but we cannot do this until the deprecated support for
4828 initializing zero-length array members is removed. */
4829 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4830 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4831 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4833 fieldsize
= array_size_for_constructor (local
->val
);
4834 /* Given a non-empty initialization, this field had
4836 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4839 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (local
->field
), 1);
4842 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4844 /* Output the element's initial value. */
4845 if (local
->val
== NULL_TREE
)
4846 assemble_zeros (fieldsize
);
4848 output_constant (local
->val
, fieldsize
, align2
);
4850 /* Count its size. */
4851 local
->total_bytes
+= fieldsize
;
4854 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4855 output an element that is a true bitfield or part of an outer one. */
4858 output_constructor_bitfield (oc_local_state
*local
, oc_outer_state
*outer
)
4860 /* Bit size of this element. */
4861 HOST_WIDE_INT ebitsize
4863 ? tree_low_cst (DECL_SIZE (local
->field
), 1)
4864 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local
->type
)), 1));
4866 /* Relative index of this element if this is an array component. */
4867 HOST_WIDE_INT relative_index
4870 ? (tree_low_cst (local
->index
, 0)
4871 - tree_low_cst (local
->min_index
, 0))
4872 : local
->last_relative_index
+ 1)
4875 /* Bit position of this element from the start of the containing
4877 HOST_WIDE_INT constructor_relative_ebitpos
4879 ? int_bit_position (local
->field
)
4880 : ebitsize
* relative_index
);
4882 /* Bit position of this element from the start of a possibly ongoing
4883 outer byte buffer. */
4884 HOST_WIDE_INT byte_relative_ebitpos
4885 = ((outer
? outer
->bit_offset
: 0) + constructor_relative_ebitpos
);
4887 /* From the start of a possibly ongoing outer byte buffer, offsets to
4888 the first bit of this element and to the first bit past the end of
4890 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4891 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4893 local
->last_relative_index
= relative_index
;
4895 if (local
->val
== NULL_TREE
)
4896 local
->val
= integer_zero_node
;
4898 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4899 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4900 local
->val
= TREE_OPERAND (local
->val
, 0);
4902 if (TREE_CODE (local
->val
) != INTEGER_CST
4903 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4905 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4909 /* If this field does not start in this (or, next) byte,
4911 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4913 /* Output remnant of any bit field in previous bytes. */
4914 if (local
->byte_buffer_in_use
)
4916 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4917 local
->total_bytes
++;
4918 local
->byte_buffer_in_use
= false;
4921 /* If still not at proper byte, advance to there. */
4922 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4924 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
4925 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
4926 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
4930 /* Set up the buffer if necessary. */
4931 if (!local
->byte_buffer_in_use
)
4935 local
->byte_buffer_in_use
= true;
4938 /* If this is nested constructor, recurse passing the bit offset and the
4939 pending data, then retrieve the new pending data afterwards. */
4940 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
4942 oc_outer_state output_state
;
4944 output_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
4945 output_state
.byte
= local
->byte
;
4947 += output_constructor (local
->val
, 0, 0, &output_state
);
4948 local
->byte
= output_state
.byte
;
4952 /* Otherwise, we must split the element into pieces that fall within
4953 separate bytes, and combine each byte with previous or following
4955 while (next_offset
< end_offset
)
4959 HOST_WIDE_INT value
;
4960 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4961 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4963 /* Advance from byte to byte
4964 within this element when necessary. */
4965 while (next_byte
!= local
->total_bytes
)
4967 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4968 local
->total_bytes
++;
4972 /* Number of bits we can process at once
4973 (all part of the same byte). */
4974 this_time
= MIN (end_offset
- next_offset
,
4975 BITS_PER_UNIT
- next_bit
);
4976 if (BYTES_BIG_ENDIAN
)
4978 /* On big-endian machine, take the most significant bits
4979 first (of the bits that are significant)
4980 and put them into bytes from the most significant end. */
4981 shift
= end_offset
- next_offset
- this_time
;
4983 /* Don't try to take a bunch of bits that cross
4984 the word boundary in the INTEGER_CST. We can
4985 only select bits from the LOW or HIGH part
4987 if (shift
< HOST_BITS_PER_WIDE_INT
4988 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4990 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4991 shift
= HOST_BITS_PER_WIDE_INT
;
4994 /* Now get the bits from the appropriate constant word. */
4995 if (shift
< HOST_BITS_PER_WIDE_INT
)
4996 value
= TREE_INT_CST_LOW (local
->val
);
4999 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5000 value
= TREE_INT_CST_HIGH (local
->val
);
5001 shift
-= HOST_BITS_PER_WIDE_INT
;
5004 /* Get the result. This works only when:
5005 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5006 local
->byte
|= (((value
>> shift
)
5007 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5008 << (BITS_PER_UNIT
- this_time
- next_bit
));
5012 /* On little-endian machines,
5013 take first the least significant bits of the value
5014 and pack them starting at the least significant
5015 bits of the bytes. */
5016 shift
= next_offset
- byte_relative_ebitpos
;
5018 /* Don't try to take a bunch of bits that cross
5019 the word boundary in the INTEGER_CST. We can
5020 only select bits from the LOW or HIGH part
5022 if (shift
< HOST_BITS_PER_WIDE_INT
5023 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
5024 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
5026 /* Now get the bits from the appropriate constant word. */
5027 if (shift
< HOST_BITS_PER_WIDE_INT
)
5028 value
= TREE_INT_CST_LOW (local
->val
);
5031 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5032 value
= TREE_INT_CST_HIGH (local
->val
);
5033 shift
-= HOST_BITS_PER_WIDE_INT
;
5036 /* Get the result. This works only when:
5037 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5038 local
->byte
|= (((value
>> shift
)
5039 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5043 next_offset
+= this_time
;
5044 local
->byte_buffer_in_use
= true;
5048 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5049 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5050 caller output state of relevance in recursive invocations. */
5052 static unsigned HOST_WIDE_INT
5053 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5054 unsigned int align
, oc_outer_state
* outer
)
5056 unsigned HOST_WIDE_INT cnt
;
5057 constructor_elt
*ce
;
5059 oc_local_state local
;
5061 /* Setup our local state to communicate with helpers. */
5064 local
.align
= align
;
5066 local
.total_bytes
= 0;
5067 local
.byte_buffer_in_use
= outer
!= NULL
;
5068 local
.byte
= outer
? outer
->byte
: 0;
5070 local
.type
= TREE_TYPE (exp
);
5072 local
.last_relative_index
= -1;
5074 local
.min_index
= NULL_TREE
;
5075 if (TREE_CODE (local
.type
) == ARRAY_TYPE
5076 && TYPE_DOMAIN (local
.type
) != NULL_TREE
)
5077 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5079 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5081 /* As CE goes through the elements of the constant, FIELD goes through the
5082 structure fields if the constant is a structure. If the constant is a
5083 union, we override this by getting the field from the TREE_LIST element.
5084 But the constant could also be an array. Then FIELD is zero.
5086 There is always a maximum of one element in the chain LINK for unions
5087 (even if the initializer in a source program incorrectly contains
5090 local
.field
= NULL_TREE
;
5091 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5092 local
.field
= TYPE_FIELDS (local
.type
);
5095 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5096 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5098 local
.val
= ce
->value
;
5099 local
.index
= NULL_TREE
;
5101 /* The element in a union constructor specifies the proper field
5103 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5104 local
.field
= ce
->index
;
5106 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5107 local
.index
= ce
->index
;
5109 if (local
.field
&& flag_verbose_asm
)
5110 fprintf (asm_out_file
, "%s %s:\n",
5112 DECL_NAME (local
.field
)
5113 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5116 /* Eliminate the marker that makes a cast not be an lvalue. */
5117 if (local
.val
!= NULL_TREE
)
5118 STRIP_NOPS (local
.val
);
5120 /* Output the current element, using the appropriate helper ... */
5122 /* For an array slice not part of an outer bitfield. */
5124 && local
.index
!= NULL_TREE
5125 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5126 output_constructor_array_range (&local
);
5128 /* For a field that is neither a true bitfield nor part of an outer one,
5129 known to be at least byte aligned and multiple-of-bytes long. */
5131 && (local
.field
== NULL_TREE
5132 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5133 output_constructor_regular_field (&local
);
5135 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5136 supported for scalar fields, so we may need to convert first. */
5139 if (TREE_CODE (local
.val
) == REAL_CST
)
5141 = fold_unary (VIEW_CONVERT_EXPR
,
5142 build_nonstandard_integer_type
5143 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5145 output_constructor_bitfield (&local
, outer
);
5149 /* If we are not at toplevel, save the pending data for our caller.
5150 Otherwise output the pending data and padding zeros as needed. */
5152 outer
->byte
= local
.byte
;
5155 if (local
.byte_buffer_in_use
)
5157 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5158 local
.total_bytes
++;
5161 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5163 assemble_zeros (local
.size
- local
.total_bytes
);
5164 local
.total_bytes
= local
.size
;
5168 return local
.total_bytes
;
5171 /* Mark DECL as weak. */
5174 mark_weak (tree decl
)
5176 DECL_WEAK (decl
) = 1;
5178 if (DECL_RTL_SET_P (decl
)
5179 && MEM_P (DECL_RTL (decl
))
5180 && XEXP (DECL_RTL (decl
), 0)
5181 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5182 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5185 /* Merge weak status between NEWDECL and OLDDECL. */
5188 merge_weak (tree newdecl
, tree olddecl
)
5190 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5192 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5195 /* We put the NEWDECL on the weak_decls list at some point
5196 and OLDDECL as well. Keep just OLDDECL on the list. */
5197 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5198 if (TREE_VALUE (*pwd
) == newdecl
)
5200 *pwd
= TREE_CHAIN (*pwd
);
5207 if (DECL_WEAK (newdecl
))
5211 /* NEWDECL is weak, but OLDDECL is not. */
5213 /* If we already output the OLDDECL, we're in trouble; we can't
5214 go back and make it weak. This should never happen in
5215 unit-at-a-time compilation. */
5216 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5218 /* If we've already generated rtl referencing OLDDECL, we may
5219 have done so in a way that will not function properly with
5220 a weak symbol. Again in unit-at-a-time this should be
5222 gcc_assert (!TREE_USED (olddecl
)
5223 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5225 if (TARGET_SUPPORTS_WEAK
)
5227 /* We put the NEWDECL on the weak_decls list at some point.
5228 Replace it with the OLDDECL. */
5229 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5230 if (TREE_VALUE (wd
) == newdecl
)
5232 TREE_VALUE (wd
) = olddecl
;
5235 /* We may not find the entry on the list. If NEWDECL is a
5236 weak alias, then we will have already called
5237 globalize_decl to remove the entry; in that case, we do
5238 not need to do anything. */
5241 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5242 mark_weak (olddecl
);
5245 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5246 weak. Just update NEWDECL to indicate that it's weak too. */
5247 mark_weak (newdecl
);
5250 /* Declare DECL to be a weak symbol. */
5253 declare_weak (tree decl
)
5255 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5256 if (! TREE_PUBLIC (decl
))
5257 error ("weak declaration of %q+D must be public", decl
);
5258 else if (!TARGET_SUPPORTS_WEAK
)
5259 warning (0, "weak declaration of %q+D not supported", decl
);
5262 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5263 DECL_ATTRIBUTES (decl
)
5264 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5268 weak_finish_1 (tree decl
)
5270 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5271 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5274 if (! TREE_USED (decl
))
5277 #ifdef ASM_WEAKEN_DECL
5278 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5280 #ifdef ASM_WEAKEN_LABEL
5281 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5283 #ifdef ASM_OUTPUT_WEAK_ALIAS
5285 static bool warn_once
= 0;
5288 warning (0, "only weak aliases are supported in this configuration");
5298 /* Fiven an assembly name, find the decl it is associated with. */
5300 find_decl (tree target
)
5302 symtab_node node
= symtab_node_for_asm (target
);
5304 return node
->symbol
.decl
;
5308 /* This TREE_LIST contains weakref targets. */
5310 static GTY(()) tree weakref_targets
;
5312 /* Emit any pending weak declarations. */
5319 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5321 tree alias_decl
= TREE_PURPOSE (t
);
5322 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5324 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5325 /* Remove alias_decl from the weak list, but leave entries for
5326 the target alone. */
5328 #ifndef ASM_OUTPUT_WEAKREF
5329 else if (! TREE_SYMBOL_REFERENCED (target
))
5331 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5332 defined, otherwise we and weak_finish_1 would use
5333 different macros. */
5334 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5335 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5337 tree decl
= find_decl (target
);
5341 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5342 TREE_CODE (alias_decl
), target
,
5343 TREE_TYPE (alias_decl
));
5345 DECL_EXTERNAL (decl
) = 1;
5346 TREE_PUBLIC (decl
) = 1;
5347 DECL_ARTIFICIAL (decl
) = 1;
5348 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5349 TREE_USED (decl
) = 1;
5352 weak_finish_1 (decl
);
5361 /* Remove the alias and the target from the pending weak list
5362 so that we do not emit any .weak directives for the former,
5363 nor multiple .weak directives for the latter. */
5364 for (p
= &weak_decls
; (t2
= *p
) ; )
5366 if (TREE_VALUE (t2
) == alias_decl
5367 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5368 *p
= TREE_CHAIN (t2
);
5370 p
= &TREE_CHAIN (t2
);
5373 /* Remove other weakrefs to the same target, to speed things up. */
5374 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5376 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5377 *p
= TREE_CHAIN (t2
);
5379 p
= &TREE_CHAIN (t2
);
5384 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5386 tree decl
= TREE_VALUE (t
);
5388 weak_finish_1 (decl
);
5392 /* Emit the assembly bits to indicate that DECL is globally visible. */
5395 globalize_decl (tree decl
)
5398 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5399 if (DECL_WEAK (decl
))
5401 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5404 #ifdef ASM_WEAKEN_DECL
5405 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5407 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5410 /* Remove this function from the pending weak list so that
5411 we do not emit multiple .weak directives for it. */
5412 for (p
= &weak_decls
; (t
= *p
) ; )
5414 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5415 *p
= TREE_CHAIN (t
);
5417 p
= &TREE_CHAIN (t
);
5420 /* Remove weakrefs to the same target from the pending weakref
5421 list, for the same reason. */
5422 for (p
= &weakref_targets
; (t
= *p
) ; )
5424 if (DECL_ASSEMBLER_NAME (decl
)
5425 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5426 *p
= TREE_CHAIN (t
);
5428 p
= &TREE_CHAIN (t
);
5435 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5438 vec
<alias_pair
, va_gc
> *alias_pairs
;
5440 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5441 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5442 tree node is DECL to have the value of the tree node TARGET. */
5445 do_assemble_alias (tree decl
, tree target
)
5447 /* Emulated TLS had better not get this var. */
5448 gcc_assert(!(!targetm
.have_tls
5449 && TREE_CODE (decl
) == VAR_DECL
5450 && DECL_THREAD_LOCAL_P (decl
)));
5452 if (TREE_ASM_WRITTEN (decl
))
5455 /* We must force creation of DECL_RTL for debug info generation, even though
5456 we don't use it here. */
5457 make_decl_rtl (decl
);
5459 TREE_ASM_WRITTEN (decl
) = 1;
5460 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5462 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5464 ultimate_transparent_alias_target (&target
);
5466 if (!TREE_SYMBOL_REFERENCED (target
))
5467 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5469 #ifdef ASM_OUTPUT_WEAKREF
5470 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5471 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5472 IDENTIFIER_POINTER (target
));
5474 if (!TARGET_SUPPORTS_WEAK
)
5476 error_at (DECL_SOURCE_LOCATION (decl
),
5477 "weakref is not supported in this configuration");
5484 #ifdef ASM_OUTPUT_DEF
5485 /* Make name accessible from other files, if appropriate. */
5487 if (TREE_PUBLIC (decl
))
5489 globalize_decl (decl
);
5490 maybe_assemble_visibility (decl
);
5492 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5494 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE) && HAVE_GNU_INDIRECT_FUNCTION
5495 ASM_OUTPUT_TYPE_DIRECTIVE
5496 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5499 error_at (DECL_SOURCE_LOCATION (decl
),
5500 "ifunc is not supported in this configuration");
5504 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5505 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5507 ASM_OUTPUT_DEF (asm_out_file
,
5508 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5509 IDENTIFIER_POINTER (target
));
5511 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5516 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5517 # ifdef ASM_WEAKEN_DECL
5518 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5520 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5522 /* Remove this function from the pending weak list so that
5523 we do not emit multiple .weak directives for it. */
5524 for (p
= &weak_decls
; (t
= *p
) ; )
5525 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5526 *p
= TREE_CHAIN (t
);
5528 p
= &TREE_CHAIN (t
);
5530 /* Remove weakrefs to the same target from the pending weakref
5531 list, for the same reason. */
5532 for (p
= &weakref_targets
; (t
= *p
) ; )
5534 if (DECL_ASSEMBLER_NAME (decl
)
5535 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5536 *p
= TREE_CHAIN (t
);
5538 p
= &TREE_CHAIN (t
);
5544 /* Emit an assembler directive to make the symbol for DECL an alias to
5545 the symbol for TARGET. */
5548 assemble_alias (tree decl
, tree target
)
5552 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5554 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5556 ultimate_transparent_alias_target (&target
);
5558 if (alias
== target
)
5559 error ("weakref %q+D ultimately targets itself", decl
);
5562 #ifndef ASM_OUTPUT_WEAKREF
5563 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5564 TREE_CHAIN (alias
) = target
;
5567 if (TREE_PUBLIC (decl
))
5568 error ("weakref %q+D must have static linkage", decl
);
5572 #if !defined (ASM_OUTPUT_DEF)
5573 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5574 error_at (DECL_SOURCE_LOCATION (decl
),
5575 "alias definitions not supported in this configuration");
5578 if (!DECL_WEAK (decl
))
5580 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5581 error_at (DECL_SOURCE_LOCATION (decl
),
5582 "ifunc is not supported in this configuration");
5584 error_at (DECL_SOURCE_LOCATION (decl
),
5585 "only weak aliases are supported in this configuration");
5591 TREE_USED (decl
) = 1;
5593 /* Allow aliases to aliases. */
5594 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5595 cgraph_get_create_node (decl
)->alias
= true;
5597 varpool_node_for_decl (decl
)->alias
= true;
5599 /* If the target has already been emitted, we don't have to queue the
5600 alias. This saves a tad of memory. */
5601 if (cgraph_global_info_ready
)
5602 target_decl
= find_decl (target
);
5605 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5606 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5607 do_assemble_alias (decl
, target
);
5610 alias_pair p
= {decl
, target
};
5611 vec_safe_push (alias_pairs
, p
);
5615 /* Record and output a table of translations from original function
5616 to its transaction aware clone. Note that tm_pure functions are
5617 considered to be their own clone. */
5619 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5620 htab_t tm_clone_hash
;
5623 record_tm_clone_pair (tree o
, tree n
)
5625 struct tree_map
**slot
, *h
;
5627 if (tm_clone_hash
== NULL
)
5628 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5630 h
= ggc_alloc_tree_map ();
5631 h
->hash
= htab_hash_pointer (o
);
5635 slot
= (struct tree_map
**)
5636 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5641 get_tm_clone_pair (tree o
)
5645 struct tree_map
*h
, in
;
5648 in
.hash
= htab_hash_pointer (o
);
5649 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5657 typedef struct tm_alias_pair
5665 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5666 into a VEC in INFO. */
5669 dump_tm_clone_to_vec (void **slot
, void *info
)
5671 struct tree_map
*map
= (struct tree_map
*) *slot
;
5672 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5673 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5674 tm_alias_pairs
->safe_push (p
);
5678 /* Dump the actual pairs to the .tm_clone_table section. */
5681 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5685 bool switched
= false;
5687 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5691 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5692 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5694 /* The function ipa_tm_create_version() marks the clone as needed if
5695 the original function was needed. But we also mark the clone as
5696 needed if we ever called the clone indirectly through
5697 TM_GETTMCLONE. If neither of these are true, we didn't generate
5698 a clone, and we didn't call it indirectly... no sense keeping it
5699 in the clone table. */
5700 if (!dst_n
|| !dst_n
->analyzed
)
5703 /* This covers the case where we have optimized the original
5704 function away, and only access the transactional clone. */
5705 if (!src_n
|| !src_n
->analyzed
)
5710 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5711 assemble_align (POINTER_SIZE
);
5715 assemble_integer (XEXP (DECL_RTL (src
), 0),
5716 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5717 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5718 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5722 /* Provide a default for the tm_clone_table section. */
5725 default_clone_table_section (void)
5727 return get_named_section (NULL
, ".tm_clone_table", 3);
5730 /* Helper comparison function for qsorting by the DECL_UID stored in
5731 alias_pair->emitted_diags. */
5734 tm_alias_pair_cmp (const void *x
, const void *y
)
5736 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5737 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5738 if (p1
->uid
< p2
->uid
)
5740 if (p1
->uid
> p2
->uid
)
5746 finish_tm_clone_pairs (void)
5748 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5750 if (tm_clone_hash
== NULL
)
5753 /* We need a determenistic order for the .tm_clone_table, otherwise
5754 we will get bootstrap comparison failures, so dump the hash table
5755 to a vector, sort it, and dump the vector. */
5757 /* Dump the hashtable to a vector. */
5758 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5759 (void *) &tm_alias_pairs
);
5761 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5764 dump_tm_clone_pairs (tm_alias_pairs
);
5766 htab_delete (tm_clone_hash
);
5767 tm_clone_hash
= NULL
;
5768 tm_alias_pairs
.release ();
5772 /* Emit an assembler directive to set symbol for DECL visibility to
5773 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5776 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5777 int vis ATTRIBUTE_UNUSED
)
5779 #ifdef HAVE_GAS_HIDDEN
5780 static const char * const visibility_types
[] = {
5781 NULL
, "protected", "hidden", "internal"
5784 const char *name
, *type
;
5786 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5787 type
= visibility_types
[vis
];
5789 fprintf (asm_out_file
, "\t.%s\t", type
);
5790 assemble_name (asm_out_file
, name
);
5791 fprintf (asm_out_file
, "\n");
5793 warning (OPT_Wattributes
, "visibility attribute not supported "
5794 "in this configuration; ignored");
5798 /* A helper function to call assemble_visibility when needed for a decl. */
5801 maybe_assemble_visibility (tree decl
)
5803 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5805 if (vis
!= VISIBILITY_DEFAULT
)
5807 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5814 /* Returns 1 if the target configuration supports defining public symbols
5815 so that one of them will be chosen at link time instead of generating a
5816 multiply-defined symbol error, whether through the use of weak symbols or
5817 a target-specific mechanism for having duplicates discarded. */
5820 supports_one_only (void)
5822 if (SUPPORTS_ONE_ONLY
)
5824 return TARGET_SUPPORTS_WEAK
;
5827 /* Set up DECL as a public symbol that can be defined in multiple
5828 translation units without generating a linker error. */
5831 make_decl_one_only (tree decl
, tree comdat_group
)
5833 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5834 || TREE_CODE (decl
) == FUNCTION_DECL
);
5836 TREE_PUBLIC (decl
) = 1;
5838 if (SUPPORTS_ONE_ONLY
)
5840 #ifdef MAKE_DECL_ONE_ONLY
5841 MAKE_DECL_ONE_ONLY (decl
);
5843 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5845 else if (TREE_CODE (decl
) == VAR_DECL
5846 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5847 DECL_COMMON (decl
) = 1;
5850 gcc_assert (TARGET_SUPPORTS_WEAK
);
5851 DECL_WEAK (decl
) = 1;
5856 init_varasm_once (void)
5858 section_htab
= htab_create_ggc (31, section_entry_hash
,
5859 section_entry_eq
, NULL
);
5860 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5861 object_block_entry_eq
, NULL
);
5862 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5863 const_desc_eq
, NULL
);
5865 const_alias_set
= new_alias_set ();
5866 shared_constant_pool
= create_constant_pool ();
5868 #ifdef TEXT_SECTION_ASM_OP
5869 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5870 TEXT_SECTION_ASM_OP
);
5873 #ifdef DATA_SECTION_ASM_OP
5874 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5875 DATA_SECTION_ASM_OP
);
5878 #ifdef SDATA_SECTION_ASM_OP
5879 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5880 SDATA_SECTION_ASM_OP
);
5883 #ifdef READONLY_DATA_SECTION_ASM_OP
5884 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5885 READONLY_DATA_SECTION_ASM_OP
);
5888 #ifdef CTORS_SECTION_ASM_OP
5889 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5890 CTORS_SECTION_ASM_OP
);
5893 #ifdef DTORS_SECTION_ASM_OP
5894 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5895 DTORS_SECTION_ASM_OP
);
5898 #ifdef BSS_SECTION_ASM_OP
5899 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5900 output_section_asm_op
,
5901 BSS_SECTION_ASM_OP
);
5904 #ifdef SBSS_SECTION_ASM_OP
5905 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5906 output_section_asm_op
,
5907 SBSS_SECTION_ASM_OP
);
5910 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5911 | SECTION_COMMON
, emit_tls_common
);
5912 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5913 | SECTION_COMMON
, emit_local
);
5914 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5915 | SECTION_COMMON
, emit_common
);
5917 #if defined ASM_OUTPUT_ALIGNED_BSS
5918 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5922 targetm
.asm_out
.init_sections ();
5924 if (readonly_data_section
== NULL
)
5925 readonly_data_section
= text_section
;
5927 #ifdef ASM_OUTPUT_EXTERNAL
5928 pending_assemble_externals_set
= pointer_set_create ();
5933 decl_default_tls_model (const_tree decl
)
5935 enum tls_model kind
;
5938 is_local
= targetm
.binds_local_p (decl
);
5942 kind
= TLS_MODEL_LOCAL_EXEC
;
5944 kind
= TLS_MODEL_INITIAL_EXEC
;
5947 /* Local dynamic is inefficient when we're not combining the
5948 parts of the address. */
5949 else if (optimize
&& is_local
)
5950 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5952 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5953 if (kind
< flag_tls_default
)
5954 kind
= flag_tls_default
;
5959 /* Select a set of attributes for section NAME based on the properties
5960 of DECL and whether or not RELOC indicates that DECL's initializer
5961 might contain runtime relocations.
5963 We make the section read-only and executable for a function decl,
5964 read-only for a const data decl, and writable for a non-const data decl. */
5967 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5971 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5972 flags
= SECTION_CODE
;
5975 enum section_category category
5976 = categorize_decl_for_section (decl
, reloc
);
5977 if (decl_readonly_section_1 (category
))
5979 else if (category
== SECCAT_DATA_REL_RO
5980 || category
== SECCAT_DATA_REL_RO_LOCAL
)
5981 flags
= SECTION_WRITE
| SECTION_RELRO
;
5983 flags
= SECTION_WRITE
;
5987 flags
= SECTION_WRITE
;
5988 if (strcmp (name
, ".data.rel.ro") == 0
5989 || strcmp (name
, ".data.rel.ro.local") == 0)
5990 flags
|= SECTION_RELRO
;
5993 if (decl
&& DECL_ONE_ONLY (decl
))
5994 flags
|= SECTION_LINKONCE
;
5996 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5997 flags
|= SECTION_TLS
| SECTION_WRITE
;
5999 if (strcmp (name
, ".bss") == 0
6000 || strncmp (name
, ".bss.", 5) == 0
6001 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6002 || strcmp (name
, ".sbss") == 0
6003 || strncmp (name
, ".sbss.", 6) == 0
6004 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6005 flags
|= SECTION_BSS
;
6007 if (strcmp (name
, ".tdata") == 0
6008 || strncmp (name
, ".tdata.", 7) == 0
6009 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6010 flags
|= SECTION_TLS
;
6012 if (strcmp (name
, ".tbss") == 0
6013 || strncmp (name
, ".tbss.", 6) == 0
6014 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6015 flags
|= SECTION_TLS
| SECTION_BSS
;
6017 /* These three sections have special ELF types. They are neither
6018 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6019 want to print a section type (@progbits or @nobits). If someone
6020 is silly enough to emit code or TLS variables to one of these
6021 sections, then don't handle them specially. */
6022 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6023 && (strcmp (name
, ".init_array") == 0
6024 || strcmp (name
, ".fini_array") == 0
6025 || strcmp (name
, ".preinit_array") == 0))
6026 flags
|= SECTION_NOTYPE
;
6031 /* Return true if the target supports some form of global BSS,
6032 either through bss_noswitch_section, or by selecting a BSS
6033 section in TARGET_ASM_SELECT_SECTION. */
6036 have_global_bss_p (void)
6038 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6041 /* Output assembly to switch to section NAME with attribute FLAGS.
6042 Four variants for common object file formats. */
6045 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6046 unsigned int flags ATTRIBUTE_UNUSED
,
6047 tree decl ATTRIBUTE_UNUSED
)
6049 /* Some object formats don't support named sections at all. The
6050 front-end should already have flagged this as an error. */
6054 #ifndef TLS_SECTION_ASM_FLAG
6055 #define TLS_SECTION_ASM_FLAG 'T'
6059 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6060 tree decl ATTRIBUTE_UNUSED
)
6062 char flagchars
[10], *f
= flagchars
;
6064 /* If we have already declared this section, we can use an
6065 abbreviated form to switch back to it -- unless this section is
6066 part of a COMDAT groups, in which case GAS requires the full
6067 declaration every time. */
6068 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6069 && (flags
& SECTION_DECLARED
))
6071 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6075 if (!(flags
& SECTION_DEBUG
))
6077 if (flags
& SECTION_EXCLUDE
)
6079 if (flags
& SECTION_WRITE
)
6081 if (flags
& SECTION_CODE
)
6083 if (flags
& SECTION_SMALL
)
6085 if (flags
& SECTION_MERGE
)
6087 if (flags
& SECTION_STRINGS
)
6089 if (flags
& SECTION_TLS
)
6090 *f
++ = TLS_SECTION_ASM_FLAG
;
6091 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6095 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6097 if (!(flags
& SECTION_NOTYPE
))
6102 if (flags
& SECTION_BSS
)
6108 /* On platforms that use "@" as the assembly comment character,
6110 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6112 fprintf (asm_out_file
, format
, type
);
6114 if (flags
& SECTION_ENTSIZE
)
6115 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6116 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6118 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6119 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6121 fprintf (asm_out_file
, ",%s,comdat",
6122 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6126 putc ('\n', asm_out_file
);
6130 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6131 tree decl ATTRIBUTE_UNUSED
)
6133 char flagchars
[8], *f
= flagchars
;
6135 if (flags
& SECTION_WRITE
)
6137 if (flags
& SECTION_CODE
)
6141 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6145 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6148 default_coff_asm_named_section (name
, flags
, decl
);
6150 if (flags
& SECTION_LINKONCE
)
6152 /* Functions may have been compiled at various levels of
6153 optimization so we can't use `same_size' here.
6154 Instead, have the linker pick one. */
6155 fprintf (asm_out_file
, "\t.linkonce %s\n",
6156 (flags
& SECTION_CODE
? "discard" : "same_size"));
6160 /* The lame default section selector. */
6163 default_select_section (tree decl
, int reloc
,
6164 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6168 if (decl_readonly_section (decl
, reloc
))
6169 return readonly_data_section
;
6171 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6173 if (! ((flag_pic
&& reloc
)
6174 || !TREE_READONLY (decl
)
6175 || TREE_SIDE_EFFECTS (decl
)
6176 || !TREE_CONSTANT (decl
)))
6177 return readonly_data_section
;
6179 else if (TREE_CODE (decl
) == STRING_CST
)
6180 return readonly_data_section
;
6181 else if (! (flag_pic
&& reloc
))
6182 return readonly_data_section
;
6184 return data_section
;
6187 enum section_category
6188 categorize_decl_for_section (const_tree decl
, int reloc
)
6190 enum section_category ret
;
6192 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6194 else if (TREE_CODE (decl
) == STRING_CST
)
6197 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6198 /* or !flag_merge_constants */
6199 return SECCAT_RODATA
;
6201 return SECCAT_RODATA_MERGE_STR
;
6203 else if (TREE_CODE (decl
) == VAR_DECL
)
6205 if (bss_initializer_p (decl
))
6207 else if (! TREE_READONLY (decl
)
6208 || TREE_SIDE_EFFECTS (decl
)
6209 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6211 /* Here the reloc_rw_mask is not testing whether the section should
6212 be read-only or not, but whether the dynamic link will have to
6213 do something. If so, we wish to segregate the data in order to
6214 minimize cache misses inside the dynamic linker. */
6215 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6216 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6220 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6221 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6222 else if (reloc
|| flag_merge_constants
< 2 || flag_mudflap
6223 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6224 /* C and C++ don't allow different variables to share the same
6225 location. -fmerge-all-constants allows even that (at the
6226 expense of not conforming). */
6227 ret
= SECCAT_RODATA
;
6228 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6229 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6231 ret
= SECCAT_RODATA_MERGE_CONST
;
6233 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6235 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6236 || TREE_SIDE_EFFECTS (decl
)
6237 || ! TREE_CONSTANT (decl
))
6240 ret
= SECCAT_RODATA
;
6243 ret
= SECCAT_RODATA
;
6245 /* There are no read-only thread-local sections. */
6246 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6248 /* Note that this would be *just* SECCAT_BSS, except that there's
6249 no concept of a read-only thread-local-data section. */
6250 if (ret
== SECCAT_BSS
6251 || (flag_zero_initialized_in_bss
6252 && initializer_zerop (DECL_INITIAL (decl
))))
6258 /* If the target uses small data sections, select it. */
6259 else if (targetm
.in_small_data_p (decl
))
6261 if (ret
== SECCAT_BSS
)
6263 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6264 ret
= SECCAT_SRODATA
;
6273 decl_readonly_section_1 (enum section_category category
)
6278 case SECCAT_RODATA_MERGE_STR
:
6279 case SECCAT_RODATA_MERGE_STR_INIT
:
6280 case SECCAT_RODATA_MERGE_CONST
:
6281 case SECCAT_SRODATA
:
6289 decl_readonly_section (const_tree decl
, int reloc
)
6291 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6294 /* Select a section based on the above categorization. */
6297 default_elf_select_section (tree decl
, int reloc
,
6298 unsigned HOST_WIDE_INT align
)
6301 switch (categorize_decl_for_section (decl
, reloc
))
6304 /* We're not supposed to be called on FUNCTION_DECLs. */
6307 return readonly_data_section
;
6308 case SECCAT_RODATA_MERGE_STR
:
6309 return mergeable_string_section (decl
, align
, 0);
6310 case SECCAT_RODATA_MERGE_STR_INIT
:
6311 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6312 case SECCAT_RODATA_MERGE_CONST
:
6313 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6314 case SECCAT_SRODATA
:
6318 return data_section
;
6319 case SECCAT_DATA_REL
:
6320 sname
= ".data.rel";
6322 case SECCAT_DATA_REL_LOCAL
:
6323 sname
= ".data.rel.local";
6325 case SECCAT_DATA_REL_RO
:
6326 sname
= ".data.rel.ro";
6328 case SECCAT_DATA_REL_RO_LOCAL
:
6329 sname
= ".data.rel.ro.local";
6354 return get_named_section (decl
, sname
, reloc
);
6357 /* Construct a unique section name based on the decl name and the
6358 categorization performed above. */
6361 default_unique_section (tree decl
, int reloc
)
6363 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6364 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6365 const char *prefix
, *name
, *linkonce
;
6368 switch (categorize_decl_for_section (decl
, reloc
))
6371 prefix
= one_only
? ".t" : ".text";
6374 case SECCAT_RODATA_MERGE_STR
:
6375 case SECCAT_RODATA_MERGE_STR_INIT
:
6376 case SECCAT_RODATA_MERGE_CONST
:
6377 prefix
= one_only
? ".r" : ".rodata";
6379 case SECCAT_SRODATA
:
6380 prefix
= one_only
? ".s2" : ".sdata2";
6383 prefix
= one_only
? ".d" : ".data";
6385 case SECCAT_DATA_REL
:
6386 prefix
= one_only
? ".d.rel" : ".data.rel";
6388 case SECCAT_DATA_REL_LOCAL
:
6389 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6391 case SECCAT_DATA_REL_RO
:
6392 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6394 case SECCAT_DATA_REL_RO_LOCAL
:
6395 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6398 prefix
= one_only
? ".s" : ".sdata";
6401 prefix
= one_only
? ".b" : ".bss";
6404 prefix
= one_only
? ".sb" : ".sbss";
6407 prefix
= one_only
? ".td" : ".tdata";
6410 prefix
= one_only
? ".tb" : ".tbss";
6416 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6417 name
= targetm
.strip_name_encoding (name
);
6419 /* If we're using one_only, then there needs to be a .gnu.linkonce
6420 prefix to the section name. */
6421 linkonce
= one_only
? ".gnu.linkonce" : "";
6423 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6425 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6428 /* Like compute_reloc_for_constant, except for an RTX. The return value
6429 is a mask for which bit 1 indicates a global relocation, and bit 0
6430 indicates a local relocation. */
6433 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6435 int *preloc
= (int *) data
;
6438 switch (GET_CODE (x
))
6441 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6454 compute_reloc_for_rtx (rtx x
)
6458 switch (GET_CODE (x
))
6464 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6473 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6475 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6477 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6478 return data_section
;
6480 return readonly_data_section
;
6484 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6485 unsigned HOST_WIDE_INT align
)
6487 int reloc
= compute_reloc_for_rtx (x
);
6489 /* ??? Handle small data here somehow. */
6491 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6494 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6496 return get_named_section (NULL
, ".data.rel.ro", 3);
6499 return mergeable_constant_section (mode
, align
, 0);
6502 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6505 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6510 /* Careful not to prod global register variables. */
6513 symbol
= XEXP (rtl
, 0);
6514 if (GET_CODE (symbol
) != SYMBOL_REF
)
6517 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6518 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6519 flags
|= SYMBOL_FLAG_FUNCTION
;
6520 if (targetm
.binds_local_p (decl
))
6521 flags
|= SYMBOL_FLAG_LOCAL
;
6522 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6523 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6524 else if (targetm
.in_small_data_p (decl
))
6525 flags
|= SYMBOL_FLAG_SMALL
;
6526 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6527 being PUBLIC, the thing *must* be defined in this translation unit.
6528 Prevent this buglet from being propagated into rtl code as well. */
6529 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6530 flags
|= SYMBOL_FLAG_EXTERNAL
;
6532 SYMBOL_REF_FLAGS (symbol
) = flags
;
6535 /* By default, we do nothing for encode_section_info, so we need not
6536 do anything but discard the '*' marker. */
6539 default_strip_name_encoding (const char *str
)
6541 return str
+ (*str
== '*');
6544 #ifdef ASM_OUTPUT_DEF
6545 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6546 anchor relative to ".", the current section position. */
6549 default_asm_output_anchor (rtx symbol
)
6553 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6554 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6555 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6559 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6562 default_use_anchors_for_symbol_p (const_rtx symbol
)
6567 /* Don't use anchors for mergeable sections. The linker might move
6568 the objects around. */
6569 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6570 if (sect
->common
.flags
& SECTION_MERGE
)
6573 /* Don't use anchors for small data sections. The small data register
6574 acts as an anchor for such sections. */
6575 if (sect
->common
.flags
& SECTION_SMALL
)
6578 decl
= SYMBOL_REF_DECL (symbol
);
6579 if (decl
&& DECL_P (decl
))
6581 /* Don't use section anchors for decls that might be defined by
6583 if (!targetm
.binds_local_p (decl
))
6586 /* Don't use section anchors for decls that will be placed in a
6587 small data section. */
6588 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6589 one above. The problem is that we only use SECTION_SMALL for
6590 sections that should be marked as small in the section directive. */
6591 if (targetm
.in_small_data_p (decl
))
6597 /* Return true when RESOLUTION indicate that symbol will be bound to the
6598 definition provided by current .o file. */
6601 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6603 return (resolution
== LDPR_PREVAILING_DEF
6604 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6605 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6608 /* Return true when RESOLUTION indicate that symbol will be bound locally
6609 within current executable or DSO. */
6612 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6614 return (resolution
== LDPR_PREVAILING_DEF
6615 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6616 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6617 || resolution
== LDPR_PREEMPTED_REG
6618 || resolution
== LDPR_PREEMPTED_IR
6619 || resolution
== LDPR_RESOLVED_IR
6620 || resolution
== LDPR_RESOLVED_EXEC
);
6623 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6624 wrt cross-module name binding. */
6627 default_binds_local_p (const_tree exp
)
6629 return default_binds_local_p_1 (exp
, flag_shlib
);
6633 default_binds_local_p_1 (const_tree exp
, int shlib
)
6636 bool resolved_locally
= false;
6637 bool resolved_to_local_def
= false;
6639 /* With resolution file in hands, take look into resolutions.
6640 We can't just return true for resolved_locally symbols,
6641 because dynamic linking might overwrite symbols
6642 in shared libraries. */
6643 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6644 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6646 struct varpool_node
*vnode
= varpool_get_node (exp
);
6647 if (vnode
&& resolution_local_p (vnode
->symbol
.resolution
))
6648 resolved_locally
= true;
6650 && resolution_to_local_definition_p (vnode
->symbol
.resolution
))
6651 resolved_to_local_def
= true;
6653 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6655 struct cgraph_node
*node
= cgraph_get_node (exp
);
6657 && resolution_local_p (node
->symbol
.resolution
))
6658 resolved_locally
= true;
6660 && resolution_to_local_definition_p (node
->symbol
.resolution
))
6661 resolved_to_local_def
= true;
6664 /* A non-decl is an entry in the constant pool. */
6667 /* Weakrefs may not bind locally, even though the weakref itself is always
6668 static and therefore local. Similarly, the resolver for ifunc functions
6669 might resolve to a non-local function.
6670 FIXME: We can resolve the weakref case more curefuly by looking at the
6672 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6673 || (TREE_CODE (exp
) == FUNCTION_DECL
6674 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6676 /* Static variables are always local. */
6677 else if (! TREE_PUBLIC (exp
))
6679 /* A variable is local if the user has said explicitly that it will
6681 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6682 || resolved_to_local_def
)
6683 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6685 /* Variables defined outside this object might not be local. */
6686 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6688 /* If defined in this object and visibility is not default, must be
6690 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6692 /* Default visibility weak data can be overridden by a strong symbol
6693 in another module and so are not local. */
6694 else if (DECL_WEAK (exp
)
6695 && !resolved_locally
)
6697 /* If PIC, then assume that any global name can be overridden by
6698 symbols resolved from other modules. */
6701 /* Uninitialized COMMON variable may be unified with symbols
6702 resolved from other modules. */
6703 else if (DECL_COMMON (exp
)
6704 && !resolved_locally
6705 && (DECL_INITIAL (exp
) == NULL
6706 || DECL_INITIAL (exp
) == error_mark_node
))
6708 /* Otherwise we're left with initialized (or non-common) global data
6709 which is of necessity defined locally. */
6716 /* Return true when references to DECL must bind to current definition in
6719 The condition is usually equivalent to whether the function binds to the
6720 current module (shared library or executable), that is to binds_local_p.
6721 We use this fact to avoid need for another target hook and implement
6722 the logic using binds_local_p and just special cases where
6723 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6724 the weak definitions (that can be overwritten at linktime by other
6725 definition from different object file) and when resolution info is available
6726 we simply use the knowledge passed to us by linker plugin. */
6728 decl_binds_to_current_def_p (tree decl
)
6730 gcc_assert (DECL_P (decl
));
6731 if (!TREE_PUBLIC (decl
))
6733 if (!targetm
.binds_local_p (decl
))
6735 /* When resolution is available, just use it. */
6736 if (TREE_CODE (decl
) == VAR_DECL
6737 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6739 struct varpool_node
*vnode
= varpool_get_node (decl
);
6741 && vnode
->symbol
.resolution
!= LDPR_UNKNOWN
)
6742 return resolution_to_local_definition_p (vnode
->symbol
.resolution
);
6744 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6746 struct cgraph_node
*node
= cgraph_get_node (decl
);
6748 && node
->symbol
.resolution
!= LDPR_UNKNOWN
)
6749 return resolution_to_local_definition_p (node
->symbol
.resolution
);
6751 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6752 binds locally but still can be overwritten).
6753 This rely on fact that binds_local_p behave as decl_replaceable_p
6754 for all other declaration types. */
6755 return !DECL_WEAK (decl
);
6758 /* A replaceable function or variable is one which may be replaced
6759 at link-time with an entirely different definition, provided that the
6760 replacement has the same type. For example, functions declared
6761 with __attribute__((weak)) on most systems are replaceable.
6763 COMDAT functions are not replaceable, since all definitions of the
6764 function must be equivalent. It is important that COMDAT functions
6765 not be treated as replaceable so that use of C++ template
6766 instantiations is not penalized. */
6769 decl_replaceable_p (tree decl
)
6771 gcc_assert (DECL_P (decl
));
6772 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6774 return !decl_binds_to_current_def_p (decl
);
6777 /* Default function to output code that will globalize a label. A
6778 target must define GLOBAL_ASM_OP or provide its own function to
6779 globalize a label. */
6780 #ifdef GLOBAL_ASM_OP
6782 default_globalize_label (FILE * stream
, const char *name
)
6784 fputs (GLOBAL_ASM_OP
, stream
);
6785 assemble_name (stream
, name
);
6786 putc ('\n', stream
);
6788 #endif /* GLOBAL_ASM_OP */
6790 /* Default function to output code that will globalize a declaration. */
6792 default_globalize_decl_name (FILE * stream
, tree decl
)
6794 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6795 targetm
.asm_out
.globalize_label (stream
, name
);
6798 /* Default function to output a label for unwind information. The
6799 default is to do nothing. A target that needs nonlocal labels for
6800 unwind information must provide its own function to do this. */
6802 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6803 tree decl ATTRIBUTE_UNUSED
,
6804 int for_eh ATTRIBUTE_UNUSED
,
6805 int empty ATTRIBUTE_UNUSED
)
6809 /* Default function to output a label to divide up the exception table.
6810 The default is to do nothing. A target that needs/wants to divide
6811 up the table must provide it's own function to do this. */
6813 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6817 /* This is how to output an internal numbered label where PREFIX is
6818 the class of label and LABELNO is the number within the class. */
6821 default_generate_internal_label (char *buf
, const char *prefix
,
6822 unsigned long labelno
)
6824 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6827 /* This is how to output an internal numbered label where PREFIX is
6828 the class of label and LABELNO is the number within the class. */
6831 default_internal_label (FILE *stream
, const char *prefix
,
6832 unsigned long labelno
)
6834 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6835 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6836 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6840 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6843 default_asm_declare_constant_name (FILE *file
, const char *name
,
6844 const_tree exp ATTRIBUTE_UNUSED
,
6845 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6847 assemble_label (file
, name
);
6850 /* This is the default behavior at the beginning of a file. It's
6851 controlled by two other target-hook toggles. */
6853 default_file_start (void)
6855 if (targetm
.asm_file_start_app_off
6856 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6857 fputs (ASM_APP_OFF
, asm_out_file
);
6859 if (targetm
.asm_file_start_file_directive
)
6860 output_file_directive (asm_out_file
, main_input_filename
);
6863 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6864 which emits a special section directive used to indicate whether or
6865 not this object file needs an executable stack. This is primarily
6866 a GNU extension to ELF but could be used on other targets. */
6868 int trampolines_created
;
6871 file_end_indicate_exec_stack (void)
6873 unsigned int flags
= SECTION_DEBUG
;
6874 if (trampolines_created
)
6875 flags
|= SECTION_CODE
;
6877 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6880 /* Emit a special section directive to indicate that this object file
6881 was compiled with -fsplit-stack. This is used to let the linker
6882 detect calls between split-stack code and non-split-stack code, so
6883 that it can modify the split-stack code to allocate a sufficiently
6884 large stack. We emit another special section if there are any
6885 functions in this file which have the no_split_stack attribute, to
6886 prevent the linker from warning about being unable to convert the
6887 functions if they call non-split-stack code. */
6890 file_end_indicate_split_stack (void)
6892 if (flag_split_stack
)
6894 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6896 if (saw_no_split_stack
)
6897 switch_to_section (get_section (".note.GNU-no-split-stack",
6898 SECTION_DEBUG
, NULL
));
6902 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6903 a get_unnamed_section callback. */
6906 output_section_asm_op (const void *directive
)
6908 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6911 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6912 the current section is NEW_SECTION. */
6915 switch_to_section (section
*new_section
)
6917 if (in_section
== new_section
)
6920 if (new_section
->common
.flags
& SECTION_FORGET
)
6923 in_section
= new_section
;
6925 switch (SECTION_STYLE (new_section
))
6928 targetm
.asm_out
.named_section (new_section
->named
.name
,
6929 new_section
->named
.common
.flags
,
6930 new_section
->named
.decl
);
6933 case SECTION_UNNAMED
:
6934 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6937 case SECTION_NOSWITCH
:
6942 new_section
->common
.flags
|= SECTION_DECLARED
;
6945 /* If block symbol SYMBOL has not yet been assigned an offset, place
6946 it at the end of its block. */
6949 place_block_symbol (rtx symbol
)
6951 unsigned HOST_WIDE_INT size
, mask
, offset
;
6952 struct constant_descriptor_rtx
*desc
;
6953 unsigned int alignment
;
6954 struct object_block
*block
;
6957 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6958 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6961 /* Work out the symbol's size and alignment. */
6962 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6964 desc
= SYMBOL_REF_CONSTANT (symbol
);
6965 alignment
= desc
->align
;
6966 size
= GET_MODE_SIZE (desc
->mode
);
6968 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6970 decl
= SYMBOL_REF_DECL (symbol
);
6971 alignment
= DECL_ALIGN (decl
);
6972 size
= get_constant_size (DECL_INITIAL (decl
));
6974 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
6975 && asan_protect_global (DECL_INITIAL (decl
)))
6976 size
+= asan_red_zone_size (size
);
6980 decl
= SYMBOL_REF_DECL (symbol
);
6981 alignment
= DECL_ALIGN (decl
);
6982 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6983 if (flag_asan
&& asan_protect_global (decl
))
6985 size
+= asan_red_zone_size (size
);
6986 alignment
= MAX (alignment
,
6987 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
6991 /* Calculate the object's offset from the start of the block. */
6992 block
= SYMBOL_REF_BLOCK (symbol
);
6993 mask
= alignment
/ BITS_PER_UNIT
- 1;
6994 offset
= (block
->size
+ mask
) & ~mask
;
6995 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6997 /* Record the block's new alignment and size. */
6998 block
->alignment
= MAX (block
->alignment
, alignment
);
6999 block
->size
= offset
+ size
;
7001 vec_safe_push (block
->objects
, symbol
);
7004 /* Return the anchor that should be used to address byte offset OFFSET
7005 from the first object in BLOCK. MODEL is the TLS model used
7009 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7010 enum tls_model model
)
7013 unsigned int begin
, middle
, end
;
7014 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7017 /* Work out the anchor's offset. Use an offset of 0 for the first
7018 anchor so that we don't pessimize the case where we take the address
7019 of a variable at the beginning of the block. This is particularly
7020 useful when a block has only one variable assigned to it.
7022 We try to place anchors RANGE bytes apart, so there can then be
7023 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7024 a ptr_mode offset. With some target settings, the lowest such
7025 anchor might be out of range for the lowest ptr_mode offset;
7026 likewise the highest anchor for the highest offset. Use anchors
7027 at the extreme ends of the ptr_mode range in such cases.
7029 All arithmetic uses unsigned integers in order to avoid
7031 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7032 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7033 range
= max_offset
- min_offset
+ 1;
7038 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7041 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7042 delta
-= delta
% range
;
7045 offset
= (HOST_WIDE_INT
) (-delta
);
7049 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7050 delta
-= delta
% range
;
7051 if (delta
> bias
- 1)
7053 offset
= (HOST_WIDE_INT
) delta
;
7057 /* Do a binary search to see if there's already an anchor we can use.
7058 Set BEGIN to the new anchor's index if not. */
7060 end
= vec_safe_length (block
->anchors
);
7061 while (begin
!= end
)
7063 middle
= (end
+ begin
) / 2;
7064 anchor
= (*block
->anchors
)[middle
];
7065 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7067 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7069 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7071 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7077 /* Create a new anchor with a unique label. */
7078 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7079 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7080 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7081 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7083 /* Insert it at index BEGIN. */
7084 vec_safe_insert (block
->anchors
, begin
, anchor
);
7088 /* Output the objects in BLOCK. */
7091 output_object_block (struct object_block
*block
)
7093 struct constant_descriptor_rtx
*desc
;
7095 HOST_WIDE_INT offset
;
7099 if (!block
->objects
)
7102 /* Switch to the section and make sure that the first byte is
7103 suitably aligned. */
7104 switch_to_section (block
->sect
);
7105 assemble_align (block
->alignment
);
7107 /* Define the values of all anchors relative to the current section
7109 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7110 targetm
.asm_out
.output_anchor (symbol
);
7112 /* Output the objects themselves. */
7114 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7116 /* Move to the object's offset, padding with zeros if necessary. */
7117 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7118 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7119 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7121 desc
= SYMBOL_REF_CONSTANT (symbol
);
7122 output_constant_pool_1 (desc
, 1);
7123 offset
+= GET_MODE_SIZE (desc
->mode
);
7125 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7128 decl
= SYMBOL_REF_DECL (symbol
);
7129 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7131 size
= get_constant_size (DECL_INITIAL (decl
));
7134 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7135 && asan_protect_global (DECL_INITIAL (decl
)))
7137 size
= asan_red_zone_size (size
);
7138 assemble_zeros (size
);
7145 decl
= SYMBOL_REF_DECL (symbol
);
7146 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7147 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7149 if (flag_asan
&& asan_protect_global (decl
))
7151 size
= asan_red_zone_size (size
);
7152 assemble_zeros (size
);
7159 /* A htab_traverse callback used to call output_object_block for
7160 each member of object_block_htab. */
7163 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7165 output_object_block ((struct object_block
*) (*slot
));
7169 /* Output the definitions of all object_blocks. */
7172 output_object_blocks (void)
7174 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7177 /* This function provides a possible implementation of the
7178 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7179 by -frecord-gcc-switches it creates a new mergeable, string section in the
7180 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7181 contains the switches in ASCII format.
7183 FIXME: This code does not correctly handle double quote characters
7184 that appear inside strings, (it strips them rather than preserving them).
7185 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7186 characters - instead it treats them as sub-string separators. Since
7187 we want to emit NUL strings terminators into the object file we have to use
7191 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7195 case SWITCH_TYPE_PASSED
:
7196 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7197 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7200 case SWITCH_TYPE_DESCRIPTIVE
:
7203 /* Distinguish between invocations where name is NULL. */
7204 static bool started
= false;
7210 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7214 | (SECTION_ENTSIZE
& 1),
7216 switch_to_section (sec
);
7225 /* The return value is currently ignored by the caller, but must be 0.
7226 For -fverbose-asm the return value would be the number of characters
7227 emitted into the assembler file. */
7231 /* Emit text to declare externally defined symbols. It is needed to
7232 properly support non-default visibility. */
7234 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7236 const char *name ATTRIBUTE_UNUSED
)
7238 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7239 set in order to avoid putting out names that are never really
7241 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7242 && targetm
.binds_local_p (decl
))
7243 maybe_assemble_visibility (decl
);
7246 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7249 default_asm_output_source_filename (FILE *file
, const char *name
)
7251 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7252 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7254 fprintf (file
, "\t.file\t");
7255 output_quoted_string (file
, name
);
7260 /* Output a file name in the form wanted by System V. */
7263 output_file_directive (FILE *asm_file
, const char *input_name
)
7268 if (input_name
== NULL
)
7269 input_name
= "<stdin>";
7271 input_name
= remap_debug_filename (input_name
);
7273 len
= strlen (input_name
);
7274 na
= input_name
+ len
;
7276 /* NA gets INPUT_NAME sans directory names. */
7277 while (na
> input_name
)
7279 if (IS_DIR_SEPARATOR (na
[-1]))
7284 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7287 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7290 make_debug_expr_from_rtl (const_rtx exp
)
7292 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7293 enum machine_mode mode
= GET_MODE (exp
);
7296 DECL_ARTIFICIAL (ddecl
) = 1;
7297 if (REG_P (exp
) && REG_EXPR (exp
))
7298 type
= TREE_TYPE (REG_EXPR (exp
));
7299 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7300 type
= TREE_TYPE (MEM_EXPR (exp
));
7303 if (type
&& TYPE_MODE (type
) == mode
)
7304 TREE_TYPE (ddecl
) = type
;
7306 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7307 DECL_MODE (ddecl
) = mode
;
7308 dval
= gen_rtx_DEBUG_EXPR (mode
);
7309 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7310 SET_DECL_RTL (ddecl
, dval
);
7314 #ifdef ELF_ASCII_ESCAPES
7315 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7318 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7323 fputs (STRING_ASM_OP
, f
);
7328 escape
= ELF_ASCII_ESCAPES
[c
];
7335 /* TODO: Print in hex with fast function, important for -flto. */
7336 fprintf (f
, "\\%03o", c
);
7349 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7352 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7354 const char *limit
= s
+ len
;
7355 const char *last_null
= NULL
;
7356 unsigned bytes_in_chunk
= 0;
7360 for (; s
< limit
; s
++)
7364 if (bytes_in_chunk
>= 60)
7373 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7380 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7382 if (bytes_in_chunk
> 0)
7389 default_elf_asm_output_limited_string (f
, s
);
7394 if (bytes_in_chunk
== 0)
7395 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7398 escape
= ELF_ASCII_ESCAPES
[c
];
7406 /* TODO: Print in hex with fast function, important for -flto. */
7407 fprintf (f
, "\\%03o", c
);
7408 bytes_in_chunk
+= 4;
7413 bytes_in_chunk
+= 2;
7420 if (bytes_in_chunk
> 0)
7428 static GTY(()) section
*elf_init_array_section
;
7429 static GTY(()) section
*elf_fini_array_section
;
7432 get_elf_initfini_array_priority_section (int priority
,
7436 if (priority
!= DEFAULT_INIT_PRIORITY
)
7439 sprintf (buf
, "%s.%.5u",
7440 constructor_p
? ".init_array" : ".fini_array",
7442 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7448 if (elf_init_array_section
== NULL
)
7449 elf_init_array_section
7450 = get_section (".init_array",
7451 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7452 sec
= elf_init_array_section
;
7456 if (elf_fini_array_section
== NULL
)
7457 elf_fini_array_section
7458 = get_section (".fini_array",
7459 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7460 sec
= elf_fini_array_section
;
7466 /* Use .init_array section for constructors. */
7469 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7471 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7473 assemble_addr_to_section (symbol
, sec
);
7476 /* Use .fini_array section for destructors. */
7479 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7481 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7483 assemble_addr_to_section (symbol
, sec
);
7486 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7488 This is a bit of a cheat. The real default is a no-op, but this
7489 hook is the default for all targets with a .ident directive. */
7492 default_asm_output_ident_directive (const char *ident_str
)
7494 const char *ident_asm_op
= "\t.ident\t";
7496 /* If we are still in the front end, do not write out the string
7497 to asm_out_file. Instead, add a fake top-level asm statement.
7498 This allows the front ends to use this hook without actually
7499 writing to asm_out_file, to handle #ident or Pragma Ident. */
7500 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7502 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7503 add_asm_node (build_string (strlen (buf
), buf
));
7506 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7509 #include "gt-varasm.h"