1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 2010, 2011, 2012 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* This file handles generation of all the assembler code
24 *except* the instructions of a function.
25 This includes declarations of variables and their initial values.
27 We also output the assembler code for constants stored in memory
28 and are responsible for combining constants with the same value. */
32 #include "coretypes.h"
39 #include "hard-reg-set.h"
42 #include "diagnostic-core.h"
45 #include "langhooks.h"
49 #include "common/common-target.h"
50 #include "targhooks.h"
51 #include "tree-mudflap.h"
53 #include "pointer-set.h"
56 #ifdef XCOFF_DEBUGGING_INFO
57 #include "xcoffout.h" /* Needed for external data
58 declarations for e.g. AIX 4.x. */
61 /* The (assembler) name of the first globally-visible object output. */
62 extern GTY(()) const char *first_global_object_name
;
63 extern GTY(()) const char *weak_global_object_name
;
65 const char *first_global_object_name
;
66 const char *weak_global_object_name
;
69 struct constant_descriptor_rtx
;
70 struct rtx_constant_pool
;
72 #define n_deferred_constants (crtl->varasm.deferred_constants)
74 /* Number for making the label on the next
75 constant that is stored in memory. */
77 static GTY(()) int const_labelno
;
79 /* Carry information from ASM_DECLARE_OBJECT_NAME
80 to ASM_FINISH_DECLARE_OBJECT. */
82 int size_directive_output
;
84 /* The last decl for which assemble_variable was called,
85 if it did ASM_DECLARE_OBJECT_NAME.
86 If the last call to assemble_variable didn't do that,
89 tree last_assemble_variable_decl
;
91 /* The following global variable indicates if the first basic block
92 in a function belongs to the cold partition or not. */
94 bool first_function_block_is_cold
;
96 /* We give all constants their own alias set. Perhaps redundant with
97 MEM_READONLY_P, but pre-dates it. */
99 static alias_set_type const_alias_set
;
101 /* Whether we saw any functions with no_split_stack. */
103 static bool saw_no_split_stack
;
105 static const char *strip_reg_name (const char *);
106 static int contains_pointers_p (tree
);
107 #ifdef ASM_OUTPUT_EXTERNAL
108 static bool incorporeal_function_p (tree
);
110 static void decode_addr_const (tree
, struct addr_const
*);
111 static hashval_t
const_desc_hash (const void *);
112 static int const_desc_eq (const void *, const void *);
113 static hashval_t
const_hash_1 (const tree
);
114 static int compare_constant (const tree
, const tree
);
115 static tree
copy_constant (tree
);
116 static void output_constant_def_contents (rtx
);
117 static void output_addressed_constants (tree
);
118 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
119 static unsigned min_align (unsigned, unsigned);
120 static void globalize_decl (tree
);
121 static bool decl_readonly_section_1 (enum section_category
);
122 #ifdef BSS_SECTION_ASM_OP
123 #ifdef ASM_OUTPUT_ALIGNED_BSS
124 static void asm_output_aligned_bss (FILE *, tree
, const char *,
125 unsigned HOST_WIDE_INT
, int)
128 #endif /* BSS_SECTION_ASM_OP */
129 static void mark_weak (tree
);
130 static void output_constant_pool (const char *, tree
);
132 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
133 section
*text_section
;
134 section
*data_section
;
135 section
*readonly_data_section
;
136 section
*sdata_section
;
137 section
*ctors_section
;
138 section
*dtors_section
;
139 section
*bss_section
;
140 section
*sbss_section
;
142 /* Various forms of common section. All are guaranteed to be nonnull. */
143 section
*tls_comm_section
;
144 section
*comm_section
;
145 section
*lcomm_section
;
147 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
149 section
*bss_noswitch_section
;
151 /* The section that holds the main exception table, when known. The section
152 is set either by the target's init_sections hook or by the first call to
153 switch_to_exception_section. */
154 section
*exception_section
;
156 /* The section that holds the DWARF2 frame unwind information, when known.
157 The section is set either by the target's init_sections hook or by the
158 first call to switch_to_eh_frame_section. */
159 section
*eh_frame_section
;
161 /* asm_out_file's current section. This is NULL if no section has yet
162 been selected or if we lose track of what the current section is. */
165 /* True if code for the current function is currently being directed
166 at the cold section. */
167 bool in_cold_section_p
;
169 /* A linked list of all the unnamed sections. */
170 static GTY(()) section
*unnamed_sections
;
172 /* Return a nonzero value if DECL has a section attribute. */
173 #define IN_NAMED_SECTION(DECL) \
174 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
175 && DECL_SECTION_NAME (DECL) != NULL_TREE)
177 /* Hash table of named sections. */
178 static GTY((param_is (section
))) htab_t section_htab
;
180 /* A table of object_blocks, indexed by section. */
181 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
183 /* The next number to use for internal anchor labels. */
184 static GTY(()) int anchor_labelno
;
186 /* A pool of constants that can be shared between functions. */
187 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
189 /* Helper routines for maintaining section_htab. */
192 section_entry_eq (const void *p1
, const void *p2
)
194 const section
*old
= (const section
*) p1
;
195 const char *new_name
= (const char *) p2
;
197 return strcmp (old
->named
.name
, new_name
) == 0;
201 section_entry_hash (const void *p
)
203 const section
*old
= (const section
*) p
;
204 return htab_hash_string (old
->named
.name
);
207 /* Return a hash value for section SECT. */
210 hash_section (section
*sect
)
212 if (sect
->common
.flags
& SECTION_NAMED
)
213 return htab_hash_string (sect
->named
.name
);
214 return sect
->common
.flags
;
217 /* Helper routines for maintaining object_block_htab. */
220 object_block_entry_eq (const void *p1
, const void *p2
)
222 const struct object_block
*old
= (const struct object_block
*) p1
;
223 const section
*new_section
= (const section
*) p2
;
225 return old
->sect
== new_section
;
229 object_block_entry_hash (const void *p
)
231 const struct object_block
*old
= (const struct object_block
*) p
;
232 return hash_section (old
->sect
);
235 /* Return a new unnamed section with the given fields. */
238 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
243 sect
= ggc_alloc_section ();
244 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
245 sect
->unnamed
.callback
= callback
;
246 sect
->unnamed
.data
= data
;
247 sect
->unnamed
.next
= unnamed_sections
;
249 unnamed_sections
= sect
;
253 /* Return a SECTION_NOSWITCH section with the given fields. */
256 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
260 sect
= ggc_alloc_section ();
261 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
262 sect
->noswitch
.callback
= callback
;
267 /* Return the named section structure associated with NAME. Create
268 a new section with the given fields if no such structure exists. */
271 get_section (const char *name
, unsigned int flags
, tree decl
)
273 section
*sect
, **slot
;
276 htab_find_slot_with_hash (section_htab
, name
,
277 htab_hash_string (name
), INSERT
);
278 flags
|= SECTION_NAMED
;
281 sect
= ggc_alloc_section ();
282 sect
->named
.common
.flags
= flags
;
283 sect
->named
.name
= ggc_strdup (name
);
284 sect
->named
.decl
= decl
;
290 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
291 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
293 /* It is fine if one of the section flags is
294 SECTION_WRITE | SECTION_RELRO and the other has none of these
295 flags (i.e. read-only) in named sections and either the
296 section hasn't been declared yet or has been declared as writable.
297 In that case just make sure the resulting flags are
298 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
300 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
301 == (SECTION_WRITE
| SECTION_RELRO
)
302 && (sect
->common
.flags
303 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
304 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
305 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
306 || (sect
->common
.flags
& SECTION_WRITE
)))
308 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
311 /* Sanity check user variables for flag changes. */
313 decl
= sect
->named
.decl
;
315 if (sect
->named
.decl
== NULL
)
316 error ("%+D causes a section type conflict", decl
);
319 error ("%+D causes a section type conflict with %D",
320 decl
, sect
->named
.decl
);
321 if (decl
!= sect
->named
.decl
)
322 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
323 "%qD was declared here", sect
->named
.decl
);
325 /* Make sure we don't error about one section multiple times. */
326 sect
->common
.flags
|= SECTION_OVERRIDE
;
332 /* Return true if the current compilation mode benefits from having
333 objects grouped into blocks. */
336 use_object_blocks_p (void)
338 return flag_section_anchors
;
341 /* Return the object_block structure for section SECT. Create a new
342 structure if we haven't created one already. Return null if SECT
345 static struct object_block
*
346 get_block_for_section (section
*sect
)
348 struct object_block
*block
;
354 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
355 hash_section (sect
), INSERT
);
356 block
= (struct object_block
*) *slot
;
359 block
= ggc_alloc_cleared_object_block ();
366 /* Create a symbol with label LABEL and place it at byte offset
367 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
368 is not yet known. LABEL must be a garbage-collected string. */
371 create_block_symbol (const char *label
, struct object_block
*block
,
372 HOST_WIDE_INT offset
)
377 /* Create the extended SYMBOL_REF. */
378 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
379 symbol
= ggc_alloc_zone_rtx_def (size
, &rtl_zone
);
381 /* Initialize the normal SYMBOL_REF fields. */
382 memset (symbol
, 0, size
);
383 PUT_CODE (symbol
, SYMBOL_REF
);
384 PUT_MODE (symbol
, Pmode
);
385 XSTR (symbol
, 0) = label
;
386 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
388 /* Initialize the block_symbol stuff. */
389 SYMBOL_REF_BLOCK (symbol
) = block
;
390 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
395 /* Return a section with a particular name and with whatever SECTION_*
396 flags section_type_flags deems appropriate. The name of the section
397 is taken from NAME if nonnull, otherwise it is taken from DECL's
398 DECL_SECTION_NAME. DECL is the decl associated with the section
399 (see the section comment for details) and RELOC is as for
400 section_type_flags. */
403 get_named_section (tree decl
, const char *name
, int reloc
)
407 gcc_assert (!decl
|| DECL_P (decl
));
409 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
411 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
413 return get_section (name
, flags
, decl
);
416 /* If required, set DECL_SECTION_NAME to a unique name. */
419 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
420 int flag_function_or_data_sections
)
422 if (DECL_SECTION_NAME (decl
) == NULL_TREE
423 && targetm_common
.have_named_sections
424 && (flag_function_or_data_sections
425 || DECL_ONE_ONLY (decl
)))
427 targetm
.asm_out
.unique_section (decl
, reloc
);
428 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
) = true;
432 #ifdef BSS_SECTION_ASM_OP
434 #ifdef ASM_OUTPUT_ALIGNED_BSS
436 /* Utility function for targets to use in implementing
437 ASM_OUTPUT_ALIGNED_BSS.
438 ??? It is believed that this function will work in most cases so such
439 support is localized here. */
442 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
443 const char *name
, unsigned HOST_WIDE_INT size
,
446 switch_to_section (bss_section
);
447 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
448 #ifdef ASM_DECLARE_OBJECT_NAME
449 last_assemble_variable_decl
= decl
;
450 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
452 /* Standard thing is just output label for the object. */
453 ASM_OUTPUT_LABEL (file
, name
);
454 #endif /* ASM_DECLARE_OBJECT_NAME */
455 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
460 #endif /* BSS_SECTION_ASM_OP */
462 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
463 /* Return the hot section for function DECL. Return text_section for
467 hot_function_section (tree decl
)
469 if (decl
!= NULL_TREE
470 && DECL_SECTION_NAME (decl
) != NULL_TREE
471 && targetm_common
.have_named_sections
)
472 return get_named_section (decl
, NULL
, 0);
478 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
481 When DECL_SECTION_NAME is non-NULL and it is implicit section and
482 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
483 concatenate the name with NAMED_SECTION_SUFFIX.
484 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
487 get_named_text_section (tree decl
,
488 const char *text_section_name
,
489 const char *named_section_suffix
)
491 if (decl
&& DECL_SECTION_NAME (decl
))
493 if (named_section_suffix
)
495 tree dsn
= DECL_SECTION_NAME (decl
);
496 const char *stripped_name
;
499 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
500 memcpy (name
, TREE_STRING_POINTER (dsn
),
501 TREE_STRING_LENGTH (dsn
) + 1);
503 stripped_name
= targetm
.strip_name_encoding (name
);
505 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
506 return get_named_section (decl
, buffer
, 0);
508 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
512 /* Do not try to split gnu_linkonce functions. This gets somewhat
514 if (DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
)
516 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
517 name
= targetm
.strip_name_encoding (name
);
518 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
524 return get_named_section (decl
, text_section_name
, 0);
527 /* Choose named function section based on its frequency. */
530 default_function_section (tree decl
, enum node_frequency freq
,
531 bool startup
, bool exit
)
533 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
534 /* Old GNU linkers have buggy --gc-section support, which sometimes
535 results in .gcc_except_table* sections being garbage collected. */
537 && DECL_SECTION_NAME (decl
)
538 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
542 if (!flag_reorder_functions
543 || !targetm_common
.have_named_sections
)
545 /* Startup code should go to startup subsection unless it is
546 unlikely executed (this happens especially with function splitting
547 where we can split away unnecessary parts of static constructors. */
548 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
549 return get_named_text_section (decl
, ".text.startup", NULL
);
551 /* Similarly for exit. */
552 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
553 return get_named_text_section (decl
, ".text.exit", NULL
);
555 /* Group cold functions together, similarly for hot code. */
558 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
559 return get_named_text_section (decl
, ".text.unlikely", NULL
);
560 case NODE_FREQUENCY_HOT
:
561 return get_named_text_section (decl
, ".text.hot", NULL
);
567 /* Return the section for function DECL.
569 If DECL is NULL_TREE, return the text section. We can be passed
570 NULL_TREE under some circumstances by dbxout.c at least.
572 If FORCE_COLD is true, return cold function section ignoring
573 the frequency info of cgraph_node. */
576 function_section_1 (tree decl
, bool force_cold
)
578 section
*section
= NULL
;
579 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
580 bool startup
= false, exit
= false;
584 struct cgraph_node
*node
= cgraph_get_node (decl
);
588 freq
= node
->frequency
;
589 startup
= node
->only_called_at_startup
;
590 exit
= node
->only_called_at_exit
;
594 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
596 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
597 if (decl
!= NULL_TREE
598 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
600 if (targetm
.asm_out
.function_section
)
601 section
= targetm
.asm_out
.function_section (decl
, freq
,
605 return get_named_section (decl
, NULL
, 0);
608 return targetm
.asm_out
.select_section
609 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
612 if (targetm
.asm_out
.function_section
)
613 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
616 return hot_function_section (decl
);
620 /* Return the section for function DECL.
622 If DECL is NULL_TREE, return the text section. We can be passed
623 NULL_TREE under some circumstances by dbxout.c at least. */
626 function_section (tree decl
)
628 /* Handle cases where function splitting code decides
629 to put function entry point into unlikely executed section
630 despite the fact that the function itself is not cold
631 (i.e. it is called rarely but contains a hot loop that is
632 better to live in hot subsection for the code locality). */
633 return function_section_1 (decl
,
634 first_function_block_is_cold
);
637 /* Return the section for the current function, take IN_COLD_SECTION_P
641 current_function_section (void)
643 return function_section_1 (current_function_decl
, in_cold_section_p
);
646 /* Tell assembler to switch to unlikely-to-be-executed text section. */
649 unlikely_text_section (void)
651 return function_section_1 (current_function_decl
, true);
654 /* When called within a function context, return true if the function
655 has been assigned a cold text section and if SECT is that section.
656 When called outside a function context, return true if SECT is the
657 default cold section. */
660 unlikely_text_section_p (section
*sect
)
662 return sect
== function_section_1 (current_function_decl
, true);
665 /* Return the read-only data section associated with function DECL. */
668 default_function_rodata_section (tree decl
)
670 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
672 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
674 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
680 dot
= strchr (name
+ 1, '.');
683 len
= strlen (dot
) + 8;
684 rname
= (char *) alloca (len
);
686 strcpy (rname
, ".rodata");
688 return get_section (rname
, SECTION_LINKONCE
, decl
);
690 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
691 else if (DECL_ONE_ONLY (decl
)
692 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
694 size_t len
= strlen (name
) + 1;
695 char *rname
= (char *) alloca (len
);
697 memcpy (rname
, name
, len
);
699 return get_section (rname
, SECTION_LINKONCE
, decl
);
701 /* For .text.foo we want to use .rodata.foo. */
702 else if (flag_function_sections
&& flag_data_sections
703 && strncmp (name
, ".text.", 6) == 0)
705 size_t len
= strlen (name
) + 1;
706 char *rname
= (char *) alloca (len
+ 2);
708 memcpy (rname
, ".rodata", 7);
709 memcpy (rname
+ 7, name
+ 5, len
- 5);
710 return get_section (rname
, 0, decl
);
714 return readonly_data_section
;
717 /* Return the read-only data section associated with function DECL
718 for targets where that section should be always the single
719 readonly data section. */
722 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
724 return readonly_data_section
;
727 /* Return the section to use for string merging. */
730 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
731 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
732 unsigned int flags ATTRIBUTE_UNUSED
)
736 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
737 && TREE_CODE (decl
) == STRING_CST
738 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
740 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
741 && TREE_STRING_LENGTH (decl
) >= len
)
743 enum machine_mode mode
;
744 unsigned int modesize
;
748 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
749 char *name
= (char *) alloca (strlen (prefix
) + 30);
751 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
752 modesize
= GET_MODE_BITSIZE (mode
);
753 if (modesize
>= 8 && modesize
<= 256
754 && (modesize
& (modesize
- 1)) == 0)
756 if (align
< modesize
)
759 str
= TREE_STRING_POINTER (decl
);
760 unit
= GET_MODE_SIZE (mode
);
762 /* Check for embedded NUL characters. */
763 for (i
= 0; i
< len
; i
+= unit
)
765 for (j
= 0; j
< unit
; j
++)
766 if (str
[i
+ j
] != '\0')
773 sprintf (name
, "%s.str%d.%d", prefix
,
774 modesize
/ 8, (int) (align
/ 8));
775 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
776 return get_section (name
, flags
, NULL
);
781 return readonly_data_section
;
784 /* Return the section to use for constant merging. */
787 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
788 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
789 unsigned int flags ATTRIBUTE_UNUSED
)
791 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
793 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
799 && (align
& (align
- 1)) == 0)
801 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
802 char *name
= (char *) alloca (strlen (prefix
) + 30);
804 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
805 flags
|= (align
/ 8) | SECTION_MERGE
;
806 return get_section (name
, flags
, NULL
);
808 return readonly_data_section
;
811 /* Given NAME, a putative register name, discard any customary prefixes. */
814 strip_reg_name (const char *name
)
816 #ifdef REGISTER_PREFIX
817 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
818 name
+= strlen (REGISTER_PREFIX
);
820 if (name
[0] == '%' || name
[0] == '#')
825 /* The user has asked for a DECL to have a particular name. Set (or
826 change) it in such a way that we don't prefix an underscore to
829 set_user_assembler_name (tree decl
, const char *name
)
831 char *starred
= (char *) alloca (strlen (name
) + 2);
833 strcpy (starred
+ 1, name
);
834 change_decl_assembler_name (decl
, get_identifier (starred
));
835 SET_DECL_RTL (decl
, NULL_RTX
);
838 /* Decode an `asm' spec for a declaration as a register name.
839 Return the register number, or -1 if nothing specified,
840 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
841 or -3 if ASMSPEC is `cc' and is not recognized,
842 or -4 if ASMSPEC is `memory' and is not recognized.
843 Accept an exact spelling or a decimal number.
844 Prefixes such as % are optional. */
847 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
849 /* Presume just one register is clobbered. */
856 /* Get rid of confusing prefixes. */
857 asmspec
= strip_reg_name (asmspec
);
859 /* Allow a decimal number as a "register name". */
860 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
861 if (! ISDIGIT (asmspec
[i
]))
863 if (asmspec
[0] != 0 && i
< 0)
866 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
872 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
874 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
877 #ifdef OVERLAPPING_REGISTER_NAMES
881 const char *const name
;
884 } table
[] = OVERLAPPING_REGISTER_NAMES
;
886 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
888 && ! strcmp (asmspec
, table
[i
].name
))
890 *pnregs
= table
[i
].nregs
;
891 return table
[i
].number
;
894 #endif /* OVERLAPPING_REGISTER_NAMES */
896 #ifdef ADDITIONAL_REGISTER_NAMES
898 static const struct { const char *const name
; const int number
; } table
[]
899 = ADDITIONAL_REGISTER_NAMES
;
901 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
903 && ! strcmp (asmspec
, table
[i
].name
))
904 return table
[i
].number
;
906 #endif /* ADDITIONAL_REGISTER_NAMES */
908 if (!strcmp (asmspec
, "memory"))
911 if (!strcmp (asmspec
, "cc"))
921 decode_reg_name (const char *name
)
924 return decode_reg_name_and_count (name
, &count
);
928 /* Return true if DECL's initializer is suitable for a BSS section. */
931 bss_initializer_p (const_tree decl
)
933 return (DECL_INITIAL (decl
) == NULL
934 || DECL_INITIAL (decl
) == error_mark_node
935 || (flag_zero_initialized_in_bss
936 /* Leave constant zeroes in .rodata so they
938 && !TREE_READONLY (decl
)
939 && initializer_zerop (DECL_INITIAL (decl
))));
942 /* Compute the alignment of variable specified by DECL.
943 DONT_OUTPUT_DATA is from assemble_variable. */
946 align_variable (tree decl
, bool dont_output_data
)
948 unsigned int align
= DECL_ALIGN (decl
);
950 /* In the case for initialing an array whose length isn't specified,
951 where we have not yet been able to do the layout,
952 figure out the proper alignment now. */
953 if (dont_output_data
&& DECL_SIZE (decl
) == 0
954 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
955 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
957 /* Some object file formats have a maximum alignment which they support.
958 In particular, a.out format supports a maximum alignment of 4. */
959 if (align
> MAX_OFILE_ALIGNMENT
)
961 warning (0, "alignment of %q+D is greater than maximum object "
962 "file alignment. Using %d", decl
,
963 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
964 align
= MAX_OFILE_ALIGNMENT
;
967 /* On some machines, it is good to increase alignment sometimes. */
968 if (! DECL_USER_ALIGN (decl
))
970 #ifdef DATA_ALIGNMENT
971 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
972 /* Don't increase alignment too much for TLS variables - TLS space
974 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
977 #ifdef CONSTANT_ALIGNMENT
978 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
980 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
982 /* Don't increase alignment too much for TLS variables - TLS space
984 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
990 /* Reset the alignment in case we have made it tighter, so we can benefit
991 from it in get_pointer_alignment. */
992 DECL_ALIGN (decl
) = align
;
995 /* Return the section into which the given VAR_DECL or CONST_DECL
996 should be placed. PREFER_NOSWITCH_P is true if a noswitch
997 section should be used wherever possible. */
1000 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1002 addr_space_t as
= ADDR_SPACE_GENERIC
;
1005 if (TREE_TYPE (decl
) != error_mark_node
)
1006 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1008 if (DECL_COMMON (decl
))
1010 /* If the decl has been given an explicit section name, or it resides
1011 in a non-generic address space, then it isn't common, and shouldn't
1012 be handled as such. */
1013 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1014 && ADDR_SPACE_GENERIC_P (as
));
1015 if (DECL_THREAD_LOCAL_P (decl
))
1016 return tls_comm_section
;
1017 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1018 return comm_section
;
1021 if (DECL_INITIAL (decl
) == error_mark_node
)
1022 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1023 else if (DECL_INITIAL (decl
))
1024 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1028 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1029 if (IN_NAMED_SECTION (decl
))
1030 return get_named_section (decl
, NULL
, reloc
);
1032 if (ADDR_SPACE_GENERIC_P (as
)
1033 && !DECL_THREAD_LOCAL_P (decl
)
1034 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1035 && bss_initializer_p (decl
))
1037 if (!TREE_PUBLIC (decl
)
1038 && !(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
);
3256 /* Make sure any other constants whose addresses appear in EXP
3257 are assigned label numbers. */
3258 output_addressed_constants (exp
);
3260 /* We are no longer deferring this constant. */
3261 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3263 /* If the constant is part of an object block, make sure that the
3264 decl has been positioned within its block, but do not write out
3265 its definition yet. output_object_blocks will do that later. */
3266 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3267 place_block_symbol (symbol
);
3270 bool asan_protected
= false;
3271 align
= DECL_ALIGN (decl
);
3272 switch_to_section (get_constant_section (exp
, align
));
3273 if (flag_asan
&& TREE_CODE (exp
) == STRING_CST
3274 && asan_protect_global (exp
))
3276 asan_protected
= true;
3277 align
= MAX (align
, ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3279 if (align
> BITS_PER_UNIT
)
3280 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3281 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3284 HOST_WIDE_INT size
= get_constant_size (exp
);
3285 assemble_zeros (asan_red_zone_size (size
));
3289 mudflap_enqueue_constant (exp
);
3292 /* Look up EXP in the table of constant descriptors. Return the rtl
3293 if it has been emitted, else null. */
3296 lookup_constant_def (tree exp
)
3298 struct constant_descriptor_tree
*desc
;
3299 struct constant_descriptor_tree key
;
3302 key
.hash
= const_hash_1 (exp
);
3303 desc
= (struct constant_descriptor_tree
*)
3304 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3306 return (desc
? desc
->rtl
: NULL_RTX
);
3309 /* Return a tree representing a reference to constant data in memory
3310 for the constant expression EXP.
3312 This is the counterpart of output_constant_def at the Tree level. */
3315 tree_output_constant_def (tree exp
)
3317 struct constant_descriptor_tree
*desc
, key
;
3321 /* Look up EXP in the table of constant descriptors. If we didn't find
3322 it, create a new one. */
3324 key
.hash
= const_hash_1 (exp
);
3325 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3327 desc
= (struct constant_descriptor_tree
*) *loc
;
3330 desc
= build_constant_desc (exp
);
3331 desc
->hash
= key
.hash
;
3335 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3336 varpool_finalize_decl (decl
);
3340 /* Used in the hash tables to avoid outputting the same constant
3341 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3342 are output once per function, not once per file. */
3343 /* ??? Only a few targets need per-function constant pools. Most
3344 can use one per-file pool. Should add a targetm bit to tell the
3347 struct GTY(()) rtx_constant_pool
{
3348 /* Pointers to first and last constant in pool, as ordered by offset. */
3349 struct constant_descriptor_rtx
*first
;
3350 struct constant_descriptor_rtx
*last
;
3352 /* Hash facility for making memory-constants from constant rtl-expressions.
3353 It is used on RISC machines where immediate integer arguments and
3354 constant addresses are restricted so that such constants must be stored
3356 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3358 /* Current offset in constant pool (does not include any
3359 machine-specific header). */
3360 HOST_WIDE_INT offset
;
3363 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3364 struct constant_descriptor_rtx
*next
;
3368 HOST_WIDE_INT offset
;
3370 enum machine_mode mode
;
3376 /* Hash and compare functions for const_rtx_htab. */
3379 const_desc_rtx_hash (const void *ptr
)
3381 const struct constant_descriptor_rtx
*const desc
3382 = (const struct constant_descriptor_rtx
*) ptr
;
3387 const_desc_rtx_eq (const void *a
, const void *b
)
3389 const struct constant_descriptor_rtx
*const x
3390 = (const struct constant_descriptor_rtx
*) a
;
3391 const struct constant_descriptor_rtx
*const y
3392 = (const struct constant_descriptor_rtx
*) b
;
3394 if (x
->mode
!= y
->mode
)
3396 return rtx_equal_p (x
->constant
, y
->constant
);
3399 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3402 const_rtx_hash_1 (rtx
*xp
, void *data
)
3404 unsigned HOST_WIDE_INT hwi
;
3405 enum machine_mode mode
;
3411 code
= GET_CODE (x
);
3412 mode
= GET_MODE (x
);
3413 h
= (hashval_t
) code
* 1048573 + mode
;
3421 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3422 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3425 h
^= (hashval_t
) hwi
;
3426 for (i
= 1; i
< n
; ++i
)
3429 h
^= (hashval_t
) hwi
;
3435 if (mode
== VOIDmode
)
3437 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3441 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3445 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3451 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3452 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3457 h
^= htab_hash_string (XSTR (x
, 0));
3461 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3465 case UNSPEC_VOLATILE
:
3466 h
= h
* 251 + XINT (x
, 1);
3473 hp
= (hashval_t
*) data
;
3474 *hp
= *hp
* 509 + h
;
3478 /* Compute a hash value for X, which should be a constant. */
3481 const_rtx_hash (rtx x
)
3484 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3489 /* Create and return a new rtx constant pool. */
3491 static struct rtx_constant_pool
*
3492 create_constant_pool (void)
3494 struct rtx_constant_pool
*pool
;
3496 pool
= ggc_alloc_rtx_constant_pool ();
3497 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3498 const_desc_rtx_eq
, NULL
);
3505 /* Initialize constant pool hashing for a new function. */
3508 init_varasm_status (void)
3510 crtl
->varasm
.pool
= create_constant_pool ();
3511 crtl
->varasm
.deferred_constants
= 0;
3514 /* Given a MINUS expression, simplify it if both sides
3515 include the same symbol. */
3518 simplify_subtraction (rtx x
)
3520 rtx r
= simplify_rtx (x
);
3524 /* Given a constant rtx X, make (or find) a memory constant for its value
3525 and return a MEM rtx to refer to it in memory. */
3528 force_const_mem (enum machine_mode mode
, rtx x
)
3530 struct constant_descriptor_rtx
*desc
, tmp
;
3531 struct rtx_constant_pool
*pool
;
3538 /* If we're not allowed to drop X into the constant pool, don't. */
3539 if (targetm
.cannot_force_const_mem (mode
, x
))
3542 /* Record that this function has used a constant pool entry. */
3543 crtl
->uses_const_pool
= 1;
3545 /* Decide which pool to use. */
3546 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3547 ? shared_constant_pool
3548 : crtl
->varasm
.pool
);
3550 /* Lookup the value in the hashtable. */
3553 hash
= const_rtx_hash (x
);
3554 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3555 desc
= (struct constant_descriptor_rtx
*) *slot
;
3557 /* If the constant was already present, return its memory. */
3559 return copy_rtx (desc
->mem
);
3561 /* Otherwise, create a new descriptor. */
3562 desc
= ggc_alloc_constant_descriptor_rtx ();
3565 /* Align the location counter as required by EXP's data type. */
3566 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3567 #ifdef CONSTANT_ALIGNMENT
3569 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3570 if (type
!= NULL_TREE
)
3571 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3575 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3576 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3579 desc
->constant
= copy_rtx (tmp
.constant
);
3580 desc
->offset
= pool
->offset
;
3583 desc
->align
= align
;
3584 desc
->labelno
= const_labelno
;
3587 pool
->offset
+= GET_MODE_SIZE (mode
);
3589 pool
->last
->next
= desc
;
3591 pool
->first
= pool
->last
= desc
;
3594 /* Create a string containing the label name, in LABEL. */
3595 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3598 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3599 the constants pool. */
3600 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3602 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3603 symbol
= create_block_symbol (ggc_strdup (label
),
3604 get_block_for_section (sect
), -1);
3607 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3609 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3610 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3611 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3613 /* Construct the MEM. */
3614 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3615 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3616 set_mem_align (def
, align
);
3618 /* If we're dropping a label to the constant pool, make sure we
3620 if (GET_CODE (x
) == LABEL_REF
)
3621 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3623 return copy_rtx (def
);
3626 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3629 get_pool_constant (rtx addr
)
3631 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3634 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3635 and whether it has been output or not. */
3638 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3640 struct constant_descriptor_rtx
*desc
;
3642 desc
= SYMBOL_REF_CONSTANT (addr
);
3643 *pmarked
= (desc
->mark
!= 0);
3644 return desc
->constant
;
3647 /* Similar, return the mode. */
3650 get_pool_mode (const_rtx addr
)
3652 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3655 /* Return the size of the constant pool. */
3658 get_pool_size (void)
3660 return crtl
->varasm
.pool
->offset
;
3663 /* Worker function for output_constant_pool_1. Emit assembly for X
3664 in MODE with known alignment ALIGN. */
3667 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3669 switch (GET_MODE_CLASS (mode
))
3672 case MODE_DECIMAL_FLOAT
:
3676 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3677 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3678 assemble_real (r
, mode
, align
);
3683 case MODE_PARTIAL_INT
:
3688 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3691 case MODE_VECTOR_FLOAT
:
3692 case MODE_VECTOR_INT
:
3693 case MODE_VECTOR_FRACT
:
3694 case MODE_VECTOR_UFRACT
:
3695 case MODE_VECTOR_ACCUM
:
3696 case MODE_VECTOR_UACCUM
:
3699 enum machine_mode submode
= GET_MODE_INNER (mode
);
3700 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3702 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3703 units
= CONST_VECTOR_NUNITS (x
);
3705 for (i
= 0; i
< units
; i
++)
3707 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3708 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3718 /* Worker function for output_constant_pool. Emit constant DESC,
3719 giving it ALIGN bits of alignment. */
3722 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3729 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3730 whose CODE_LABEL has been deleted. This can occur if a jump table
3731 is eliminated by optimization. If so, write a constant of zero
3732 instead. Note that this can also happen by turning the
3733 CODE_LABEL into a NOTE. */
3734 /* ??? This seems completely and utterly wrong. Certainly it's
3735 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3736 functioning even with INSN_DELETED_P and friends. */
3739 switch (GET_CODE (tmp
))
3742 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3743 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3745 tmp
= XEXP (XEXP (tmp
, 0), 0);
3749 tmp
= XEXP (tmp
, 0);
3750 gcc_assert (!INSN_DELETED_P (tmp
));
3751 gcc_assert (!NOTE_P (tmp
)
3752 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3759 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3760 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3761 align
, desc
->labelno
, done
);
3764 assemble_align (align
);
3766 /* Output the label. */
3767 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3769 /* Output the data. */
3770 output_constant_pool_2 (desc
->mode
, x
, align
);
3772 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3773 sections have proper size. */
3774 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3776 && (in_section
->common
.flags
& SECTION_MERGE
))
3777 assemble_align (align
);
3779 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3785 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3786 to as used. Emit referenced deferred strings. This function can
3787 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3790 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3792 rtx x
= *current_rtx
;
3794 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3797 if (CONSTANT_POOL_ADDRESS_P (x
))
3799 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3800 if (desc
->mark
== 0)
3803 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3806 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3808 tree decl
= SYMBOL_REF_DECL (x
);
3809 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3811 n_deferred_constants
--;
3812 output_constant_def_contents (x
);
3819 /* Look through appropriate parts of INSN, marking all entries in the
3820 constant pool which are actually being used. Entries that are only
3821 referenced by other constants are also marked as used. Emit
3822 deferred strings that are used. */
3825 mark_constants (rtx insn
)
3830 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3831 insns, not any notes that may be attached. We don't want to mark
3832 a constant just because it happens to appear in a REG_EQUIV note. */
3833 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3835 rtx seq
= PATTERN (insn
);
3836 int i
, n
= XVECLEN (seq
, 0);
3837 for (i
= 0; i
< n
; ++i
)
3839 rtx subinsn
= XVECEXP (seq
, 0, i
);
3840 if (INSN_P (subinsn
))
3841 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3845 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3848 /* Look through the instructions for this function, and mark all the
3849 entries in POOL which are actually being used. Emit deferred constants
3850 which have indeed been used. */
3853 mark_constant_pool (void)
3857 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3860 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3861 mark_constants (insn
);
3864 /* Write all the constants in POOL. */
3867 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3869 struct constant_descriptor_rtx
*desc
;
3871 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3874 /* If the constant is part of an object_block, make sure that
3875 the constant has been positioned within its block, but do not
3876 write out its definition yet. output_object_blocks will do
3878 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3879 && SYMBOL_REF_BLOCK (desc
->sym
))
3880 place_block_symbol (desc
->sym
);
3883 switch_to_section (targetm
.asm_out
.select_rtx_section
3884 (desc
->mode
, desc
->constant
, desc
->align
));
3885 output_constant_pool_1 (desc
, desc
->align
);
3890 /* Mark all constants that are used in the current function, then write
3891 out the function's private constant pool. */
3894 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3895 tree fndecl ATTRIBUTE_UNUSED
)
3897 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3899 /* It is possible for gcc to call force_const_mem and then to later
3900 discard the instructions which refer to the constant. In such a
3901 case we do not need to output the constant. */
3902 mark_constant_pool ();
3904 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3905 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3908 output_constant_pool_contents (pool
);
3910 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3911 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3915 /* Write the contents of the shared constant pool. */
3918 output_shared_constant_pool (void)
3920 output_constant_pool_contents (shared_constant_pool
);
3923 /* Determine what kind of relocations EXP may need. */
3926 compute_reloc_for_constant (tree exp
)
3928 int reloc
= 0, reloc2
;
3931 switch (TREE_CODE (exp
))
3935 /* Go inside any operations that get_inner_reference can handle and see
3936 if what's inside is a constant: no need to do anything here for
3937 addresses of variables or functions. */
3938 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3939 tem
= TREE_OPERAND (tem
, 0))
3942 if (TREE_CODE (tem
) == MEM_REF
3943 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
3945 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
3949 if (TREE_PUBLIC (tem
))
3956 case POINTER_PLUS_EXPR
:
3957 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3958 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3962 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3963 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3964 /* The difference of two local labels is computable at link time. */
3965 if (reloc
== 1 && reloc2
== 1)
3972 case VIEW_CONVERT_EXPR
:
3973 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3978 unsigned HOST_WIDE_INT idx
;
3979 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3981 reloc
|= compute_reloc_for_constant (tem
);
3991 /* Find all the constants whose addresses are referenced inside of EXP,
3992 and make sure assembler code with a label has been output for each one.
3993 Indicate whether an ADDR_EXPR has been encountered. */
3996 output_addressed_constants (tree exp
)
4000 switch (TREE_CODE (exp
))
4004 /* Go inside any operations that get_inner_reference can handle and see
4005 if what's inside is a constant: no need to do anything here for
4006 addresses of variables or functions. */
4007 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4008 tem
= TREE_OPERAND (tem
, 0))
4011 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4012 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4013 tem
= DECL_INITIAL (tem
);
4015 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4016 output_constant_def (tem
, 0);
4018 if (TREE_CODE (tem
) == MEM_REF
)
4019 output_addressed_constants (TREE_OPERAND (tem
, 0));
4023 case POINTER_PLUS_EXPR
:
4025 output_addressed_constants (TREE_OPERAND (exp
, 1));
4029 case VIEW_CONVERT_EXPR
:
4030 output_addressed_constants (TREE_OPERAND (exp
, 0));
4035 unsigned HOST_WIDE_INT idx
;
4036 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4038 output_addressed_constants (tem
);
4047 /* Whether a constructor CTOR is a valid static constant initializer if all
4048 its elements are. This used to be internal to initializer_constant_valid_p
4049 and has been exposed to let other functions like categorize_ctor_elements
4050 evaluate the property while walking a constructor for other purposes. */
4053 constructor_static_from_elts_p (const_tree ctor
)
4055 return (TREE_CONSTANT (ctor
)
4056 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4057 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4058 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4061 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4064 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4065 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4066 which are valid when ENDTYPE is an integer of any size; in
4067 particular, this does not accept a pointer minus a constant. This
4068 returns null_pointer_node if the VALUE is an absolute constant
4069 which can be used to initialize a static variable. Otherwise it
4073 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4077 if (!INTEGRAL_TYPE_P (endtype
))
4080 op0
= TREE_OPERAND (value
, 0);
4081 op1
= TREE_OPERAND (value
, 1);
4083 /* Like STRIP_NOPS except allow the operand mode to widen. This
4084 works around a feature of fold that simplifies (int)(p1 - p2) to
4085 ((int)p1 - (int)p2) under the theory that the narrower operation
4088 while (CONVERT_EXPR_P (op0
)
4089 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4091 tree inner
= TREE_OPERAND (op0
, 0);
4092 if (inner
== error_mark_node
4093 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4094 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4095 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4100 while (CONVERT_EXPR_P (op1
)
4101 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4103 tree inner
= TREE_OPERAND (op1
, 0);
4104 if (inner
== error_mark_node
4105 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4106 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4107 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4112 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4116 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4117 cache
? cache
+ 2 : NULL
);
4118 /* Both initializers must be known. */
4122 && (op0
== null_pointer_node
4123 || TREE_CODE (value
) == MINUS_EXPR
))
4124 return null_pointer_node
;
4126 /* Support differences between labels. */
4127 if (TREE_CODE (op0
) == LABEL_DECL
4128 && TREE_CODE (op1
) == LABEL_DECL
)
4129 return null_pointer_node
;
4131 if (TREE_CODE (op0
) == STRING_CST
4132 && TREE_CODE (op1
) == STRING_CST
4133 && operand_equal_p (op0
, op1
, 1))
4134 return null_pointer_node
;
4140 /* Helper function of initializer_constant_valid_p.
4141 Return nonzero if VALUE is a valid constant-valued expression
4142 for use in initializing a static variable; one that can be an
4143 element of a "constant" initializer.
4145 Return null_pointer_node if the value is absolute;
4146 if it is relocatable, return the variable that determines the relocation.
4147 We assume that VALUE has been folded as much as possible;
4148 therefore, we do not need to check for such things as
4149 arithmetic-combinations of integers.
4151 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4154 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4158 switch (TREE_CODE (value
))
4161 if (constructor_static_from_elts_p (value
))
4163 unsigned HOST_WIDE_INT idx
;
4165 bool absolute
= true;
4167 if (cache
&& cache
[0] == value
)
4169 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4172 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4179 cache
[1] = NULL_TREE
;
4183 if (reloc
!= null_pointer_node
)
4186 /* For a non-absolute relocation, there is no single
4187 variable that can be "the variable that determines the
4192 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4194 return absolute
? null_pointer_node
: error_mark_node
;
4197 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4205 return null_pointer_node
;
4210 tree op0
= staticp (TREE_OPERAND (value
, 0));
4213 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4214 to be a constant, this is old-skool offsetof-like nonsense. */
4215 if (TREE_CODE (op0
) == INDIRECT_REF
4216 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4217 return null_pointer_node
;
4218 /* Taking the address of a nested function involves a trampoline,
4219 unless we don't need or want one. */
4220 if (TREE_CODE (op0
) == FUNCTION_DECL
4221 && DECL_STATIC_CHAIN (op0
)
4222 && !TREE_NO_TRAMPOLINE (value
))
4224 /* "&{...}" requires a temporary to hold the constructed
4226 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4232 case NON_LVALUE_EXPR
:
4233 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4236 case VIEW_CONVERT_EXPR
:
4238 tree src
= TREE_OPERAND (value
, 0);
4239 tree src_type
= TREE_TYPE (src
);
4240 tree dest_type
= TREE_TYPE (value
);
4242 /* Allow view-conversions from aggregate to non-aggregate type only
4243 if the bit pattern is fully preserved afterwards; otherwise, the
4244 RTL expander won't be able to apply a subsequent transformation
4245 to the underlying constructor. */
4246 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4248 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4249 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4254 /* Allow all other kinds of view-conversion. */
4255 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4260 tree src
= TREE_OPERAND (value
, 0);
4261 tree src_type
= TREE_TYPE (src
);
4262 tree dest_type
= TREE_TYPE (value
);
4264 /* Allow conversions between pointer types, floating-point
4265 types, and offset types. */
4266 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4267 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4268 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4269 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4270 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4272 /* Allow length-preserving conversions between integer types. */
4273 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4274 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4275 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4277 /* Allow conversions between other integer types only if
4279 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4281 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4282 if (inner
== null_pointer_node
)
4283 return null_pointer_node
;
4287 /* Allow (int) &foo provided int is as wide as a pointer. */
4288 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4289 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4290 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4292 /* Likewise conversions from int to pointers, but also allow
4293 conversions from 0. */
4294 if ((POINTER_TYPE_P (dest_type
)
4295 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4296 && INTEGRAL_TYPE_P (src_type
))
4298 if (TREE_CODE (src
) == INTEGER_CST
4299 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4300 return null_pointer_node
;
4301 if (integer_zerop (src
))
4302 return null_pointer_node
;
4303 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4304 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4307 /* Allow conversions to struct or union types if the value
4309 if (TREE_CODE (dest_type
) == RECORD_TYPE
4310 || TREE_CODE (dest_type
) == UNION_TYPE
)
4311 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4315 case POINTER_PLUS_EXPR
:
4317 /* Any valid floating-point constants will have been folded by now;
4318 with -frounding-math we hit this with addition of two constants. */
4319 if (TREE_CODE (endtype
) == REAL_TYPE
)
4321 if (cache
&& cache
[0] == value
)
4323 if (! INTEGRAL_TYPE_P (endtype
)
4324 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4326 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4328 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4331 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4332 endtype
, ncache
+ 2);
4333 /* If either term is absolute, use the other term's relocation. */
4334 if (valid0
== null_pointer_node
)
4336 else if (valid1
== null_pointer_node
)
4338 /* Support narrowing pointer differences. */
4340 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4344 /* Support narrowing pointer differences. */
4345 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4354 if (TREE_CODE (endtype
) == REAL_TYPE
)
4356 if (cache
&& cache
[0] == value
)
4358 if (! INTEGRAL_TYPE_P (endtype
)
4359 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4361 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4363 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4366 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4367 endtype
, ncache
+ 2);
4368 /* Win if second argument is absolute. */
4369 if (valid1
== null_pointer_node
)
4371 /* Win if both arguments have the same relocation.
4372 Then the value is absolute. */
4373 else if (valid0
== valid1
&& valid0
!= 0)
4374 ret
= null_pointer_node
;
4375 /* Since GCC guarantees that string constants are unique in the
4376 generated code, a subtraction between two copies of the same
4377 constant string is absolute. */
4378 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4379 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4380 && operand_equal_p (valid0
, valid1
, 1))
4381 ret
= null_pointer_node
;
4382 /* Support narrowing differences. */
4384 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4388 /* Support narrowing differences. */
4389 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4404 /* Return nonzero if VALUE is a valid constant-valued expression
4405 for use in initializing a static variable; one that can be an
4406 element of a "constant" initializer.
4408 Return null_pointer_node if the value is absolute;
4409 if it is relocatable, return the variable that determines the relocation.
4410 We assume that VALUE has been folded as much as possible;
4411 therefore, we do not need to check for such things as
4412 arithmetic-combinations of integers. */
4414 initializer_constant_valid_p (tree value
, tree endtype
)
4416 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4419 /* Return true if VALUE is a valid constant-valued expression
4420 for use in initializing a static bit-field; one that can be
4421 an element of a "constant" initializer. */
4424 initializer_constant_valid_for_bitfield_p (tree value
)
4426 /* For bitfields we support integer constants or possibly nested aggregates
4428 switch (TREE_CODE (value
))
4432 unsigned HOST_WIDE_INT idx
;
4435 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4436 if (!initializer_constant_valid_for_bitfield_p (elt
))
4445 case VIEW_CONVERT_EXPR
:
4446 case NON_LVALUE_EXPR
:
4448 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4457 /* output_constructor outer state of relevance in recursive calls, typically
4458 for nested aggregate bitfields. */
4461 unsigned int bit_offset
; /* current position in ... */
4462 int byte
; /* ... the outer byte buffer. */
4465 static unsigned HOST_WIDE_INT
4466 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4469 /* Output assembler code for constant EXP to FILE, with no label.
4470 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4471 Assumes output_addressed_constants has been done on EXP already.
4473 Generate exactly SIZE bytes of assembler data, padding at the end
4474 with zeros if necessary. SIZE must always be specified.
4476 SIZE is important for structure constructors,
4477 since trailing members may have been omitted from the constructor.
4478 It is also important for initialization of arrays from string constants
4479 since the full length of the string constant might not be wanted.
4480 It is also needed for initialization of unions, where the initializer's
4481 type is just one member, and that may not be as long as the union.
4483 There a case in which we would fail to output exactly SIZE bytes:
4484 for a structure constructor that wants to produce more than SIZE bytes.
4485 But such constructors will never be generated for any possible input.
4487 ALIGN is the alignment of the data in bits. */
4490 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4492 enum tree_code code
;
4493 unsigned HOST_WIDE_INT thissize
;
4495 if (size
== 0 || flag_syntax_only
)
4498 /* See if we're trying to initialize a pointer in a non-default mode
4499 to the address of some declaration somewhere. If the target says
4500 the mode is valid for pointers, assume the target has a way of
4502 if (TREE_CODE (exp
) == NOP_EXPR
4503 && POINTER_TYPE_P (TREE_TYPE (exp
))
4504 && targetm
.addr_space
.valid_pointer_mode
4505 (TYPE_MODE (TREE_TYPE (exp
)),
4506 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4508 tree saved_type
= TREE_TYPE (exp
);
4510 /* Peel off any intermediate conversions-to-pointer for valid
4512 while (TREE_CODE (exp
) == NOP_EXPR
4513 && POINTER_TYPE_P (TREE_TYPE (exp
))
4514 && targetm
.addr_space
.valid_pointer_mode
4515 (TYPE_MODE (TREE_TYPE (exp
)),
4516 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4517 exp
= TREE_OPERAND (exp
, 0);
4519 /* If what we're left with is the address of something, we can
4520 convert the address to the final type and output it that
4522 if (TREE_CODE (exp
) == ADDR_EXPR
)
4523 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4524 /* Likewise for constant ints. */
4525 else if (TREE_CODE (exp
) == INTEGER_CST
)
4526 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4527 TREE_INT_CST_HIGH (exp
));
4531 /* Eliminate any conversions since we'll be outputting the underlying
4533 while (CONVERT_EXPR_P (exp
)
4534 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4535 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4537 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4538 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4540 /* Make sure eliminating the conversion is really a no-op, except with
4541 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4542 union types to allow for Ada unchecked unions. */
4543 if (type_size
> op_size
4544 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4545 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4546 /* Keep the conversion. */
4549 exp
= TREE_OPERAND (exp
, 0);
4552 code
= TREE_CODE (TREE_TYPE (exp
));
4553 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4555 /* Allow a constructor with no elements for any data type.
4556 This means to fill the space with zeros. */
4557 if (TREE_CODE (exp
) == CONSTRUCTOR
4558 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4560 assemble_zeros (size
);
4564 if (TREE_CODE (exp
) == FDESC_EXPR
)
4566 #ifdef ASM_OUTPUT_FDESC
4567 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4568 tree decl
= TREE_OPERAND (exp
, 0);
4569 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4576 /* Now output the underlying data. If we've handling the padding, return.
4577 Otherwise, break and ensure SIZE is the size written. */
4584 case REFERENCE_TYPE
:
4586 case FIXED_POINT_TYPE
:
4587 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4588 EXPAND_INITIALIZER
),
4589 MIN (size
, thissize
), align
, 0))
4590 error ("initializer for integer/fixed-point value is too complicated");
4594 if (TREE_CODE (exp
) != REAL_CST
)
4595 error ("initializer for floating value is not a floating constant");
4597 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4601 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4602 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4603 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4608 switch (TREE_CODE (exp
))
4611 output_constructor (exp
, size
, align
, NULL
);
4614 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4616 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4622 unsigned int i
, nalign
;
4623 enum machine_mode inner
;
4625 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4626 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4628 elt_size
= GET_MODE_SIZE (inner
);
4630 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4631 thissize
= elt_size
;
4632 for (i
= 1; i
< VECTOR_CST_NELTS (exp
); ++i
)
4634 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4635 thissize
+= elt_size
;
4646 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4647 output_constructor (exp
, size
, align
, NULL
);
4657 if (size
> thissize
)
4658 assemble_zeros (size
- thissize
);
4662 /* Subroutine of output_constructor, used for computing the size of
4663 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4664 type with an unspecified upper bound. */
4666 static unsigned HOST_WIDE_INT
4667 array_size_for_constructor (tree val
)
4670 unsigned HOST_WIDE_INT cnt
;
4671 tree index
, value
, tmp
;
4674 /* This code used to attempt to handle string constants that are not
4675 arrays of single-bytes, but nothing else does, so there's no point in
4677 if (TREE_CODE (val
) == STRING_CST
)
4678 return TREE_STRING_LENGTH (val
);
4680 max_index
= NULL_TREE
;
4681 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4683 if (TREE_CODE (index
) == RANGE_EXPR
)
4684 index
= TREE_OPERAND (index
, 1);
4685 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4689 if (max_index
== NULL_TREE
)
4692 /* Compute the total number of array elements. */
4693 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4694 i
= tree_to_double_int (max_index
) - tree_to_double_int (tmp
);
4695 i
+= double_int_one
;
4697 /* Multiply by the array element unit size to find number of bytes. */
4698 i
*= tree_to_double_int (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4700 gcc_assert (i
.fits_uhwi ());
4704 /* Other datastructures + helpers for output_constructor. */
4706 /* output_constructor local state to support interaction with helpers. */
4710 /* Received arguments. */
4711 tree exp
; /* Constructor expression. */
4712 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4713 unsigned int align
; /* Known initial alignment. */
4715 /* Constructor expression data. */
4716 tree type
; /* Expression type. */
4717 tree field
; /* Current field decl in a record. */
4718 tree min_index
; /* Lower bound if specified for an array. */
4720 /* Output processing state. */
4721 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4722 bool byte_buffer_in_use
; /* Whether byte ... */
4723 int byte
; /* ... contains part of a bitfield byte yet to
4726 int last_relative_index
; /* Implicit or explicit index of the last
4727 array element output within a bitfield. */
4728 /* Current element. */
4729 tree val
; /* Current element value. */
4730 tree index
; /* Current element index. */
4734 /* Helper for output_constructor. From the current LOCAL state, output a
4735 RANGE_EXPR element. */
4738 output_constructor_array_range (oc_local_state
*local
)
4740 unsigned HOST_WIDE_INT fieldsize
4741 = int_size_in_bytes (TREE_TYPE (local
->type
));
4743 HOST_WIDE_INT lo_index
4744 = tree_low_cst (TREE_OPERAND (local
->index
, 0), 0);
4745 HOST_WIDE_INT hi_index
4746 = tree_low_cst (TREE_OPERAND (local
->index
, 1), 0);
4747 HOST_WIDE_INT index
;
4750 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4752 for (index
= lo_index
; index
<= hi_index
; index
++)
4754 /* Output the element's initial value. */
4755 if (local
->val
== NULL_TREE
)
4756 assemble_zeros (fieldsize
);
4758 output_constant (local
->val
, fieldsize
, align2
);
4760 /* Count its size. */
4761 local
->total_bytes
+= fieldsize
;
4765 /* Helper for output_constructor. From the current LOCAL state, output a
4766 field element that is not true bitfield or part of an outer one. */
4769 output_constructor_regular_field (oc_local_state
*local
)
4771 /* Field size and position. Since this structure is static, we know the
4772 positions are constant. */
4773 unsigned HOST_WIDE_INT fieldsize
;
4774 HOST_WIDE_INT fieldpos
;
4776 unsigned int align2
;
4778 if (local
->index
!= NULL_TREE
)
4780 /* Perform the index calculation in modulo arithmetic but
4781 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4782 but we are using an unsigned sizetype. */
4783 unsigned prec
= TYPE_PRECISION (sizetype
);
4784 double_int idx
= tree_to_double_int (local
->index
)
4785 - tree_to_double_int (local
->min_index
);
4786 idx
= idx
.sext (prec
);
4787 fieldpos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)), 1)
4790 else if (local
->field
!= NULL_TREE
)
4791 fieldpos
= int_byte_position (local
->field
);
4795 /* Output any buffered-up bit-fields preceding this element. */
4796 if (local
->byte_buffer_in_use
)
4798 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4799 local
->total_bytes
++;
4800 local
->byte_buffer_in_use
= false;
4803 /* Advance to offset of this element.
4804 Note no alignment needed in an array, since that is guaranteed
4805 if each element has the proper size. */
4806 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4807 && fieldpos
!= local
->total_bytes
)
4809 gcc_assert (fieldpos
>= local
->total_bytes
);
4810 assemble_zeros (fieldpos
- local
->total_bytes
);
4811 local
->total_bytes
= fieldpos
;
4814 /* Find the alignment of this element. */
4815 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4817 /* Determine size this element should occupy. */
4822 /* If this is an array with an unspecified upper bound,
4823 the initializer determines the size. */
4824 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4825 but we cannot do this until the deprecated support for
4826 initializing zero-length array members is removed. */
4827 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4828 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4829 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4831 fieldsize
= array_size_for_constructor (local
->val
);
4832 /* Given a non-empty initialization, this field had
4834 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4837 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (local
->field
), 1);
4840 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4842 /* Output the element's initial value. */
4843 if (local
->val
== NULL_TREE
)
4844 assemble_zeros (fieldsize
);
4846 output_constant (local
->val
, fieldsize
, align2
);
4848 /* Count its size. */
4849 local
->total_bytes
+= fieldsize
;
4852 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4853 output an element that is a true bitfield or part of an outer one. */
4856 output_constructor_bitfield (oc_local_state
*local
, oc_outer_state
*outer
)
4858 /* Bit size of this element. */
4859 HOST_WIDE_INT ebitsize
4861 ? tree_low_cst (DECL_SIZE (local
->field
), 1)
4862 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local
->type
)), 1));
4864 /* Relative index of this element if this is an array component. */
4865 HOST_WIDE_INT relative_index
4868 ? (tree_low_cst (local
->index
, 0)
4869 - tree_low_cst (local
->min_index
, 0))
4870 : local
->last_relative_index
+ 1)
4873 /* Bit position of this element from the start of the containing
4875 HOST_WIDE_INT constructor_relative_ebitpos
4877 ? int_bit_position (local
->field
)
4878 : ebitsize
* relative_index
);
4880 /* Bit position of this element from the start of a possibly ongoing
4881 outer byte buffer. */
4882 HOST_WIDE_INT byte_relative_ebitpos
4883 = ((outer
? outer
->bit_offset
: 0) + constructor_relative_ebitpos
);
4885 /* From the start of a possibly ongoing outer byte buffer, offsets to
4886 the first bit of this element and to the first bit past the end of
4888 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4889 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4891 local
->last_relative_index
= relative_index
;
4893 if (local
->val
== NULL_TREE
)
4894 local
->val
= integer_zero_node
;
4896 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4897 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4898 local
->val
= TREE_OPERAND (local
->val
, 0);
4900 if (TREE_CODE (local
->val
) != INTEGER_CST
4901 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4903 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4907 /* If this field does not start in this (or, next) byte,
4909 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4911 /* Output remnant of any bit field in previous bytes. */
4912 if (local
->byte_buffer_in_use
)
4914 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4915 local
->total_bytes
++;
4916 local
->byte_buffer_in_use
= false;
4919 /* If still not at proper byte, advance to there. */
4920 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4922 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
4923 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
4924 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
4928 /* Set up the buffer if necessary. */
4929 if (!local
->byte_buffer_in_use
)
4933 local
->byte_buffer_in_use
= true;
4936 /* If this is nested constructor, recurse passing the bit offset and the
4937 pending data, then retrieve the new pending data afterwards. */
4938 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
4940 oc_outer_state output_state
;
4942 output_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
4943 output_state
.byte
= local
->byte
;
4945 += output_constructor (local
->val
, 0, 0, &output_state
);
4946 local
->byte
= output_state
.byte
;
4950 /* Otherwise, we must split the element into pieces that fall within
4951 separate bytes, and combine each byte with previous or following
4953 while (next_offset
< end_offset
)
4957 HOST_WIDE_INT value
;
4958 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4959 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4961 /* Advance from byte to byte
4962 within this element when necessary. */
4963 while (next_byte
!= local
->total_bytes
)
4965 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4966 local
->total_bytes
++;
4970 /* Number of bits we can process at once
4971 (all part of the same byte). */
4972 this_time
= MIN (end_offset
- next_offset
,
4973 BITS_PER_UNIT
- next_bit
);
4974 if (BYTES_BIG_ENDIAN
)
4976 /* On big-endian machine, take the most significant bits
4977 first (of the bits that are significant)
4978 and put them into bytes from the most significant end. */
4979 shift
= end_offset
- next_offset
- this_time
;
4981 /* Don't try to take a bunch of bits that cross
4982 the word boundary in the INTEGER_CST. We can
4983 only select bits from the LOW or HIGH part
4985 if (shift
< HOST_BITS_PER_WIDE_INT
4986 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4988 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4989 shift
= HOST_BITS_PER_WIDE_INT
;
4992 /* Now get the bits from the appropriate constant word. */
4993 if (shift
< HOST_BITS_PER_WIDE_INT
)
4994 value
= TREE_INT_CST_LOW (local
->val
);
4997 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
4998 value
= TREE_INT_CST_HIGH (local
->val
);
4999 shift
-= HOST_BITS_PER_WIDE_INT
;
5002 /* Get the result. This works only when:
5003 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5004 local
->byte
|= (((value
>> shift
)
5005 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5006 << (BITS_PER_UNIT
- this_time
- next_bit
));
5010 /* On little-endian machines,
5011 take first the least significant bits of the value
5012 and pack them starting at the least significant
5013 bits of the bytes. */
5014 shift
= next_offset
- byte_relative_ebitpos
;
5016 /* Don't try to take a bunch of bits that cross
5017 the word boundary in the INTEGER_CST. We can
5018 only select bits from the LOW or HIGH part
5020 if (shift
< HOST_BITS_PER_WIDE_INT
5021 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
5022 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
5024 /* Now get the bits from the appropriate constant word. */
5025 if (shift
< HOST_BITS_PER_WIDE_INT
)
5026 value
= TREE_INT_CST_LOW (local
->val
);
5029 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5030 value
= TREE_INT_CST_HIGH (local
->val
);
5031 shift
-= HOST_BITS_PER_WIDE_INT
;
5034 /* Get the result. This works only when:
5035 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5036 local
->byte
|= (((value
>> shift
)
5037 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5041 next_offset
+= this_time
;
5042 local
->byte_buffer_in_use
= true;
5046 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5047 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5048 caller output state of relevance in recursive invocations. */
5050 static unsigned HOST_WIDE_INT
5051 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5052 unsigned int align
, oc_outer_state
* outer
)
5054 unsigned HOST_WIDE_INT cnt
;
5055 constructor_elt
*ce
;
5057 oc_local_state local
;
5059 /* Setup our local state to communicate with helpers. */
5062 local
.align
= align
;
5064 local
.total_bytes
= 0;
5065 local
.byte_buffer_in_use
= outer
!= NULL
;
5066 local
.byte
= outer
? outer
->byte
: 0;
5068 local
.type
= TREE_TYPE (exp
);
5070 local
.last_relative_index
= -1;
5072 local
.min_index
= NULL_TREE
;
5073 if (TREE_CODE (local
.type
) == ARRAY_TYPE
5074 && TYPE_DOMAIN (local
.type
) != NULL_TREE
)
5075 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5077 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5079 /* As CE goes through the elements of the constant, FIELD goes through the
5080 structure fields if the constant is a structure. If the constant is a
5081 union, we override this by getting the field from the TREE_LIST element.
5082 But the constant could also be an array. Then FIELD is zero.
5084 There is always a maximum of one element in the chain LINK for unions
5085 (even if the initializer in a source program incorrectly contains
5088 local
.field
= NULL_TREE
;
5089 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5090 local
.field
= TYPE_FIELDS (local
.type
);
5093 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5094 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5096 local
.val
= ce
->value
;
5097 local
.index
= NULL_TREE
;
5099 /* The element in a union constructor specifies the proper field
5101 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5102 local
.field
= ce
->index
;
5104 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5105 local
.index
= ce
->index
;
5107 if (local
.field
&& flag_verbose_asm
)
5108 fprintf (asm_out_file
, "%s %s:\n",
5110 DECL_NAME (local
.field
)
5111 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5114 /* Eliminate the marker that makes a cast not be an lvalue. */
5115 if (local
.val
!= NULL_TREE
)
5116 STRIP_NOPS (local
.val
);
5118 /* Output the current element, using the appropriate helper ... */
5120 /* For an array slice not part of an outer bitfield. */
5122 && local
.index
!= NULL_TREE
5123 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5124 output_constructor_array_range (&local
);
5126 /* For a field that is neither a true bitfield nor part of an outer one,
5127 known to be at least byte aligned and multiple-of-bytes long. */
5129 && (local
.field
== NULL_TREE
5130 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5131 output_constructor_regular_field (&local
);
5133 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5134 supported for scalar fields, so we may need to convert first. */
5137 if (TREE_CODE (local
.val
) == REAL_CST
)
5139 = fold_unary (VIEW_CONVERT_EXPR
,
5140 build_nonstandard_integer_type
5141 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5143 output_constructor_bitfield (&local
, outer
);
5147 /* If we are not at toplevel, save the pending data for our caller.
5148 Otherwise output the pending data and padding zeros as needed. */
5150 outer
->byte
= local
.byte
;
5153 if (local
.byte_buffer_in_use
)
5155 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5156 local
.total_bytes
++;
5159 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5161 assemble_zeros (local
.size
- local
.total_bytes
);
5162 local
.total_bytes
= local
.size
;
5166 return local
.total_bytes
;
5169 /* Mark DECL as weak. */
5172 mark_weak (tree decl
)
5174 DECL_WEAK (decl
) = 1;
5176 if (DECL_RTL_SET_P (decl
)
5177 && MEM_P (DECL_RTL (decl
))
5178 && XEXP (DECL_RTL (decl
), 0)
5179 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5180 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5183 /* Merge weak status between NEWDECL and OLDDECL. */
5186 merge_weak (tree newdecl
, tree olddecl
)
5188 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5190 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5193 /* We put the NEWDECL on the weak_decls list at some point
5194 and OLDDECL as well. Keep just OLDDECL on the list. */
5195 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5196 if (TREE_VALUE (*pwd
) == newdecl
)
5198 *pwd
= TREE_CHAIN (*pwd
);
5205 if (DECL_WEAK (newdecl
))
5209 /* NEWDECL is weak, but OLDDECL is not. */
5211 /* If we already output the OLDDECL, we're in trouble; we can't
5212 go back and make it weak. This should never happen in
5213 unit-at-a-time compilation. */
5214 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5216 /* If we've already generated rtl referencing OLDDECL, we may
5217 have done so in a way that will not function properly with
5218 a weak symbol. Again in unit-at-a-time this should be
5220 gcc_assert (!TREE_USED (olddecl
)
5221 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5223 if (TARGET_SUPPORTS_WEAK
)
5225 /* We put the NEWDECL on the weak_decls list at some point.
5226 Replace it with the OLDDECL. */
5227 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5228 if (TREE_VALUE (wd
) == newdecl
)
5230 TREE_VALUE (wd
) = olddecl
;
5233 /* We may not find the entry on the list. If NEWDECL is a
5234 weak alias, then we will have already called
5235 globalize_decl to remove the entry; in that case, we do
5236 not need to do anything. */
5239 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5240 mark_weak (olddecl
);
5243 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5244 weak. Just update NEWDECL to indicate that it's weak too. */
5245 mark_weak (newdecl
);
5248 /* Declare DECL to be a weak symbol. */
5251 declare_weak (tree decl
)
5253 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5254 if (! TREE_PUBLIC (decl
))
5255 error ("weak declaration of %q+D must be public", decl
);
5256 else if (!TARGET_SUPPORTS_WEAK
)
5257 warning (0, "weak declaration of %q+D not supported", decl
);
5260 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5261 DECL_ATTRIBUTES (decl
)
5262 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5266 weak_finish_1 (tree decl
)
5268 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5269 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5272 if (! TREE_USED (decl
))
5275 #ifdef ASM_WEAKEN_DECL
5276 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5278 #ifdef ASM_WEAKEN_LABEL
5279 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5281 #ifdef ASM_OUTPUT_WEAK_ALIAS
5283 static bool warn_once
= 0;
5286 warning (0, "only weak aliases are supported in this configuration");
5296 /* Fiven an assembly name, find the decl it is associated with. */
5298 find_decl (tree target
)
5300 symtab_node node
= symtab_node_for_asm (target
);
5302 return node
->symbol
.decl
;
5306 /* This TREE_LIST contains weakref targets. */
5308 static GTY(()) tree weakref_targets
;
5310 /* Emit any pending weak declarations. */
5317 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5319 tree alias_decl
= TREE_PURPOSE (t
);
5320 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5322 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5323 /* Remove alias_decl from the weak list, but leave entries for
5324 the target alone. */
5326 #ifndef ASM_OUTPUT_WEAKREF
5327 else if (! TREE_SYMBOL_REFERENCED (target
))
5329 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5330 defined, otherwise we and weak_finish_1 would use
5331 different macros. */
5332 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5333 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5335 tree decl
= find_decl (target
);
5339 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5340 TREE_CODE (alias_decl
), target
,
5341 TREE_TYPE (alias_decl
));
5343 DECL_EXTERNAL (decl
) = 1;
5344 TREE_PUBLIC (decl
) = 1;
5345 DECL_ARTIFICIAL (decl
) = 1;
5346 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5347 TREE_USED (decl
) = 1;
5350 weak_finish_1 (decl
);
5359 /* Remove the alias and the target from the pending weak list
5360 so that we do not emit any .weak directives for the former,
5361 nor multiple .weak directives for the latter. */
5362 for (p
= &weak_decls
; (t2
= *p
) ; )
5364 if (TREE_VALUE (t2
) == alias_decl
5365 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5366 *p
= TREE_CHAIN (t2
);
5368 p
= &TREE_CHAIN (t2
);
5371 /* Remove other weakrefs to the same target, to speed things up. */
5372 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5374 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5375 *p
= TREE_CHAIN (t2
);
5377 p
= &TREE_CHAIN (t2
);
5382 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5384 tree decl
= TREE_VALUE (t
);
5386 weak_finish_1 (decl
);
5390 /* Emit the assembly bits to indicate that DECL is globally visible. */
5393 globalize_decl (tree decl
)
5396 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5397 if (DECL_WEAK (decl
))
5399 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5402 #ifdef ASM_WEAKEN_DECL
5403 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5405 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5408 /* Remove this function from the pending weak list so that
5409 we do not emit multiple .weak directives for it. */
5410 for (p
= &weak_decls
; (t
= *p
) ; )
5412 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5413 *p
= TREE_CHAIN (t
);
5415 p
= &TREE_CHAIN (t
);
5418 /* Remove weakrefs to the same target from the pending weakref
5419 list, for the same reason. */
5420 for (p
= &weakref_targets
; (t
= *p
) ; )
5422 if (DECL_ASSEMBLER_NAME (decl
)
5423 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5424 *p
= TREE_CHAIN (t
);
5426 p
= &TREE_CHAIN (t
);
5433 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5436 vec
<alias_pair
, va_gc
> *alias_pairs
;
5438 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5439 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5440 tree node is DECL to have the value of the tree node TARGET. */
5443 do_assemble_alias (tree decl
, tree target
)
5445 /* Emulated TLS had better not get this var. */
5446 gcc_assert(!(!targetm
.have_tls
5447 && TREE_CODE (decl
) == VAR_DECL
5448 && DECL_THREAD_LOCAL_P (decl
)));
5450 if (TREE_ASM_WRITTEN (decl
))
5453 /* We must force creation of DECL_RTL for debug info generation, even though
5454 we don't use it here. */
5455 make_decl_rtl (decl
);
5457 TREE_ASM_WRITTEN (decl
) = 1;
5458 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5460 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5462 ultimate_transparent_alias_target (&target
);
5464 if (!TREE_SYMBOL_REFERENCED (target
))
5465 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5467 #ifdef ASM_OUTPUT_WEAKREF
5468 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5469 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5470 IDENTIFIER_POINTER (target
));
5472 if (!TARGET_SUPPORTS_WEAK
)
5474 error_at (DECL_SOURCE_LOCATION (decl
),
5475 "weakref is not supported in this configuration");
5482 #ifdef ASM_OUTPUT_DEF
5483 /* Make name accessible from other files, if appropriate. */
5485 if (TREE_PUBLIC (decl
))
5487 globalize_decl (decl
);
5488 maybe_assemble_visibility (decl
);
5490 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5492 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE) && HAVE_GNU_INDIRECT_FUNCTION
5493 ASM_OUTPUT_TYPE_DIRECTIVE
5494 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5497 error_at (DECL_SOURCE_LOCATION (decl
),
5498 "ifunc is not supported in this configuration");
5502 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5503 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5505 ASM_OUTPUT_DEF (asm_out_file
,
5506 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5507 IDENTIFIER_POINTER (target
));
5509 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5514 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5515 # ifdef ASM_WEAKEN_DECL
5516 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5518 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5520 /* Remove this function from the pending weak list so that
5521 we do not emit multiple .weak directives for it. */
5522 for (p
= &weak_decls
; (t
= *p
) ; )
5523 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5524 *p
= TREE_CHAIN (t
);
5526 p
= &TREE_CHAIN (t
);
5528 /* Remove weakrefs to the same target from the pending weakref
5529 list, for the same reason. */
5530 for (p
= &weakref_targets
; (t
= *p
) ; )
5532 if (DECL_ASSEMBLER_NAME (decl
)
5533 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5534 *p
= TREE_CHAIN (t
);
5536 p
= &TREE_CHAIN (t
);
5542 /* Emit an assembler directive to make the symbol for DECL an alias to
5543 the symbol for TARGET. */
5546 assemble_alias (tree decl
, tree target
)
5550 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5552 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5554 ultimate_transparent_alias_target (&target
);
5556 if (alias
== target
)
5557 error ("weakref %q+D ultimately targets itself", decl
);
5560 #ifndef ASM_OUTPUT_WEAKREF
5561 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5562 TREE_CHAIN (alias
) = target
;
5565 if (TREE_PUBLIC (decl
))
5566 error ("weakref %q+D must have static linkage", decl
);
5570 #if !defined (ASM_OUTPUT_DEF)
5571 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5572 error_at (DECL_SOURCE_LOCATION (decl
),
5573 "alias definitions not supported in this configuration");
5576 if (!DECL_WEAK (decl
))
5578 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5579 error_at (DECL_SOURCE_LOCATION (decl
),
5580 "ifunc is not supported in this configuration");
5582 error_at (DECL_SOURCE_LOCATION (decl
),
5583 "only weak aliases are supported in this configuration");
5589 TREE_USED (decl
) = 1;
5591 /* Allow aliases to aliases. */
5592 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5593 cgraph_get_create_node (decl
)->alias
= true;
5595 varpool_node_for_decl (decl
)->alias
= true;
5597 /* If the target has already been emitted, we don't have to queue the
5598 alias. This saves a tad of memory. */
5599 if (cgraph_global_info_ready
)
5600 target_decl
= find_decl (target
);
5603 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5604 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5605 do_assemble_alias (decl
, target
);
5608 alias_pair p
= {decl
, target
};
5609 vec_safe_push (alias_pairs
, p
);
5613 /* Record and output a table of translations from original function
5614 to its transaction aware clone. Note that tm_pure functions are
5615 considered to be their own clone. */
5617 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5618 htab_t tm_clone_hash
;
5621 record_tm_clone_pair (tree o
, tree n
)
5623 struct tree_map
**slot
, *h
;
5625 if (tm_clone_hash
== NULL
)
5626 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5628 h
= ggc_alloc_tree_map ();
5629 h
->hash
= htab_hash_pointer (o
);
5633 slot
= (struct tree_map
**)
5634 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5639 get_tm_clone_pair (tree o
)
5643 struct tree_map
*h
, in
;
5646 in
.hash
= htab_hash_pointer (o
);
5647 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5655 typedef struct tm_alias_pair
5663 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5664 into a VEC in INFO. */
5667 dump_tm_clone_to_vec (void **slot
, void *info
)
5669 struct tree_map
*map
= (struct tree_map
*) *slot
;
5670 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5671 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5672 tm_alias_pairs
->safe_push (p
);
5676 /* Dump the actual pairs to the .tm_clone_table section. */
5679 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5683 bool switched
= false;
5685 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5689 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5690 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5692 /* The function ipa_tm_create_version() marks the clone as needed if
5693 the original function was needed. But we also mark the clone as
5694 needed if we ever called the clone indirectly through
5695 TM_GETTMCLONE. If neither of these are true, we didn't generate
5696 a clone, and we didn't call it indirectly... no sense keeping it
5697 in the clone table. */
5698 if (!dst_n
|| !dst_n
->analyzed
)
5701 /* This covers the case where we have optimized the original
5702 function away, and only access the transactional clone. */
5703 if (!src_n
|| !src_n
->analyzed
)
5708 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5709 assemble_align (POINTER_SIZE
);
5713 assemble_integer (XEXP (DECL_RTL (src
), 0),
5714 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5715 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5716 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5720 /* Provide a default for the tm_clone_table section. */
5723 default_clone_table_section (void)
5725 return get_named_section (NULL
, ".tm_clone_table", 3);
5728 /* Helper comparison function for qsorting by the DECL_UID stored in
5729 alias_pair->emitted_diags. */
5732 tm_alias_pair_cmp (const void *x
, const void *y
)
5734 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5735 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5736 if (p1
->uid
< p2
->uid
)
5738 if (p1
->uid
> p2
->uid
)
5744 finish_tm_clone_pairs (void)
5746 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5748 if (tm_clone_hash
== NULL
)
5751 /* We need a determenistic order for the .tm_clone_table, otherwise
5752 we will get bootstrap comparison failures, so dump the hash table
5753 to a vector, sort it, and dump the vector. */
5755 /* Dump the hashtable to a vector. */
5756 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5757 (void *) &tm_alias_pairs
);
5759 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5762 dump_tm_clone_pairs (tm_alias_pairs
);
5764 htab_delete (tm_clone_hash
);
5765 tm_clone_hash
= NULL
;
5766 tm_alias_pairs
.release ();
5770 /* Emit an assembler directive to set symbol for DECL visibility to
5771 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5774 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5775 int vis ATTRIBUTE_UNUSED
)
5777 #ifdef HAVE_GAS_HIDDEN
5778 static const char * const visibility_types
[] = {
5779 NULL
, "protected", "hidden", "internal"
5782 const char *name
, *type
;
5784 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5785 type
= visibility_types
[vis
];
5787 fprintf (asm_out_file
, "\t.%s\t", type
);
5788 assemble_name (asm_out_file
, name
);
5789 fprintf (asm_out_file
, "\n");
5791 warning (OPT_Wattributes
, "visibility attribute not supported "
5792 "in this configuration; ignored");
5796 /* A helper function to call assemble_visibility when needed for a decl. */
5799 maybe_assemble_visibility (tree decl
)
5801 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5803 if (vis
!= VISIBILITY_DEFAULT
)
5805 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5812 /* Returns 1 if the target configuration supports defining public symbols
5813 so that one of them will be chosen at link time instead of generating a
5814 multiply-defined symbol error, whether through the use of weak symbols or
5815 a target-specific mechanism for having duplicates discarded. */
5818 supports_one_only (void)
5820 if (SUPPORTS_ONE_ONLY
)
5822 return TARGET_SUPPORTS_WEAK
;
5825 /* Set up DECL as a public symbol that can be defined in multiple
5826 translation units without generating a linker error. */
5829 make_decl_one_only (tree decl
, tree comdat_group
)
5831 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5832 || TREE_CODE (decl
) == FUNCTION_DECL
);
5834 TREE_PUBLIC (decl
) = 1;
5836 if (SUPPORTS_ONE_ONLY
)
5838 #ifdef MAKE_DECL_ONE_ONLY
5839 MAKE_DECL_ONE_ONLY (decl
);
5841 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5843 else if (TREE_CODE (decl
) == VAR_DECL
5844 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5845 DECL_COMMON (decl
) = 1;
5848 gcc_assert (TARGET_SUPPORTS_WEAK
);
5849 DECL_WEAK (decl
) = 1;
5854 init_varasm_once (void)
5856 section_htab
= htab_create_ggc (31, section_entry_hash
,
5857 section_entry_eq
, NULL
);
5858 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5859 object_block_entry_eq
, NULL
);
5860 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5861 const_desc_eq
, NULL
);
5863 const_alias_set
= new_alias_set ();
5864 shared_constant_pool
= create_constant_pool ();
5866 #ifdef TEXT_SECTION_ASM_OP
5867 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5868 TEXT_SECTION_ASM_OP
);
5871 #ifdef DATA_SECTION_ASM_OP
5872 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5873 DATA_SECTION_ASM_OP
);
5876 #ifdef SDATA_SECTION_ASM_OP
5877 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5878 SDATA_SECTION_ASM_OP
);
5881 #ifdef READONLY_DATA_SECTION_ASM_OP
5882 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5883 READONLY_DATA_SECTION_ASM_OP
);
5886 #ifdef CTORS_SECTION_ASM_OP
5887 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5888 CTORS_SECTION_ASM_OP
);
5891 #ifdef DTORS_SECTION_ASM_OP
5892 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5893 DTORS_SECTION_ASM_OP
);
5896 #ifdef BSS_SECTION_ASM_OP
5897 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5898 output_section_asm_op
,
5899 BSS_SECTION_ASM_OP
);
5902 #ifdef SBSS_SECTION_ASM_OP
5903 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5904 output_section_asm_op
,
5905 SBSS_SECTION_ASM_OP
);
5908 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5909 | SECTION_COMMON
, emit_tls_common
);
5910 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5911 | SECTION_COMMON
, emit_local
);
5912 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5913 | SECTION_COMMON
, emit_common
);
5915 #if defined ASM_OUTPUT_ALIGNED_BSS
5916 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5920 targetm
.asm_out
.init_sections ();
5922 if (readonly_data_section
== NULL
)
5923 readonly_data_section
= text_section
;
5925 #ifdef ASM_OUTPUT_EXTERNAL
5926 pending_assemble_externals_set
= pointer_set_create ();
5931 decl_default_tls_model (const_tree decl
)
5933 enum tls_model kind
;
5936 is_local
= targetm
.binds_local_p (decl
);
5940 kind
= TLS_MODEL_LOCAL_EXEC
;
5942 kind
= TLS_MODEL_INITIAL_EXEC
;
5945 /* Local dynamic is inefficient when we're not combining the
5946 parts of the address. */
5947 else if (optimize
&& is_local
)
5948 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5950 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5951 if (kind
< flag_tls_default
)
5952 kind
= flag_tls_default
;
5957 /* Select a set of attributes for section NAME based on the properties
5958 of DECL and whether or not RELOC indicates that DECL's initializer
5959 might contain runtime relocations.
5961 We make the section read-only and executable for a function decl,
5962 read-only for a const data decl, and writable for a non-const data decl. */
5965 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5969 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5970 flags
= SECTION_CODE
;
5973 enum section_category category
5974 = categorize_decl_for_section (decl
, reloc
);
5975 if (decl_readonly_section_1 (category
))
5977 else if (category
== SECCAT_DATA_REL_RO
5978 || category
== SECCAT_DATA_REL_RO_LOCAL
)
5979 flags
= SECTION_WRITE
| SECTION_RELRO
;
5981 flags
= SECTION_WRITE
;
5985 flags
= SECTION_WRITE
;
5986 if (strcmp (name
, ".data.rel.ro") == 0
5987 || strcmp (name
, ".data.rel.ro.local") == 0)
5988 flags
|= SECTION_RELRO
;
5991 if (decl
&& DECL_ONE_ONLY (decl
))
5992 flags
|= SECTION_LINKONCE
;
5994 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5995 flags
|= SECTION_TLS
| SECTION_WRITE
;
5997 if (strcmp (name
, ".bss") == 0
5998 || strncmp (name
, ".bss.", 5) == 0
5999 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6000 || strcmp (name
, ".sbss") == 0
6001 || strncmp (name
, ".sbss.", 6) == 0
6002 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6003 flags
|= SECTION_BSS
;
6005 if (strcmp (name
, ".tdata") == 0
6006 || strncmp (name
, ".tdata.", 7) == 0
6007 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6008 flags
|= SECTION_TLS
;
6010 if (strcmp (name
, ".tbss") == 0
6011 || strncmp (name
, ".tbss.", 6) == 0
6012 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6013 flags
|= SECTION_TLS
| SECTION_BSS
;
6015 /* These three sections have special ELF types. They are neither
6016 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6017 want to print a section type (@progbits or @nobits). If someone
6018 is silly enough to emit code or TLS variables to one of these
6019 sections, then don't handle them specially. */
6020 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6021 && (strcmp (name
, ".init_array") == 0
6022 || strcmp (name
, ".fini_array") == 0
6023 || strcmp (name
, ".preinit_array") == 0))
6024 flags
|= SECTION_NOTYPE
;
6029 /* Return true if the target supports some form of global BSS,
6030 either through bss_noswitch_section, or by selecting a BSS
6031 section in TARGET_ASM_SELECT_SECTION. */
6034 have_global_bss_p (void)
6036 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6039 /* Output assembly to switch to section NAME with attribute FLAGS.
6040 Four variants for common object file formats. */
6043 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6044 unsigned int flags ATTRIBUTE_UNUSED
,
6045 tree decl ATTRIBUTE_UNUSED
)
6047 /* Some object formats don't support named sections at all. The
6048 front-end should already have flagged this as an error. */
6052 #ifndef TLS_SECTION_ASM_FLAG
6053 #define TLS_SECTION_ASM_FLAG 'T'
6057 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6058 tree decl ATTRIBUTE_UNUSED
)
6060 char flagchars
[10], *f
= flagchars
;
6062 /* If we have already declared this section, we can use an
6063 abbreviated form to switch back to it -- unless this section is
6064 part of a COMDAT groups, in which case GAS requires the full
6065 declaration every time. */
6066 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6067 && (flags
& SECTION_DECLARED
))
6069 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6073 if (!(flags
& SECTION_DEBUG
))
6075 if (flags
& SECTION_EXCLUDE
)
6077 if (flags
& SECTION_WRITE
)
6079 if (flags
& SECTION_CODE
)
6081 if (flags
& SECTION_SMALL
)
6083 if (flags
& SECTION_MERGE
)
6085 if (flags
& SECTION_STRINGS
)
6087 if (flags
& SECTION_TLS
)
6088 *f
++ = TLS_SECTION_ASM_FLAG
;
6089 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6093 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6095 if (!(flags
& SECTION_NOTYPE
))
6100 if (flags
& SECTION_BSS
)
6106 /* On platforms that use "@" as the assembly comment character,
6108 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6110 fprintf (asm_out_file
, format
, type
);
6112 if (flags
& SECTION_ENTSIZE
)
6113 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6114 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6116 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6117 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6119 fprintf (asm_out_file
, ",%s,comdat",
6120 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6124 putc ('\n', asm_out_file
);
6128 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6129 tree decl ATTRIBUTE_UNUSED
)
6131 char flagchars
[8], *f
= flagchars
;
6133 if (flags
& SECTION_WRITE
)
6135 if (flags
& SECTION_CODE
)
6139 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6143 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6146 default_coff_asm_named_section (name
, flags
, decl
);
6148 if (flags
& SECTION_LINKONCE
)
6150 /* Functions may have been compiled at various levels of
6151 optimization so we can't use `same_size' here.
6152 Instead, have the linker pick one. */
6153 fprintf (asm_out_file
, "\t.linkonce %s\n",
6154 (flags
& SECTION_CODE
? "discard" : "same_size"));
6158 /* The lame default section selector. */
6161 default_select_section (tree decl
, int reloc
,
6162 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6166 if (decl_readonly_section (decl
, reloc
))
6167 return readonly_data_section
;
6169 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6171 if (! ((flag_pic
&& reloc
)
6172 || !TREE_READONLY (decl
)
6173 || TREE_SIDE_EFFECTS (decl
)
6174 || !TREE_CONSTANT (decl
)))
6175 return readonly_data_section
;
6177 else if (TREE_CODE (decl
) == STRING_CST
)
6178 return readonly_data_section
;
6179 else if (! (flag_pic
&& reloc
))
6180 return readonly_data_section
;
6182 return data_section
;
6185 enum section_category
6186 categorize_decl_for_section (const_tree decl
, int reloc
)
6188 enum section_category ret
;
6190 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6192 else if (TREE_CODE (decl
) == STRING_CST
)
6195 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6196 /* or !flag_merge_constants */
6197 return SECCAT_RODATA
;
6199 return SECCAT_RODATA_MERGE_STR
;
6201 else if (TREE_CODE (decl
) == VAR_DECL
)
6203 if (bss_initializer_p (decl
))
6205 else if (! TREE_READONLY (decl
)
6206 || TREE_SIDE_EFFECTS (decl
)
6207 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6209 /* Here the reloc_rw_mask is not testing whether the section should
6210 be read-only or not, but whether the dynamic link will have to
6211 do something. If so, we wish to segregate the data in order to
6212 minimize cache misses inside the dynamic linker. */
6213 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6214 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6218 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6219 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6220 else if (reloc
|| flag_merge_constants
< 2 || flag_mudflap
6221 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6222 /* C and C++ don't allow different variables to share the same
6223 location. -fmerge-all-constants allows even that (at the
6224 expense of not conforming). */
6225 ret
= SECCAT_RODATA
;
6226 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6227 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6229 ret
= SECCAT_RODATA_MERGE_CONST
;
6231 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6233 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6234 || TREE_SIDE_EFFECTS (decl
)
6235 || ! TREE_CONSTANT (decl
))
6238 ret
= SECCAT_RODATA
;
6241 ret
= SECCAT_RODATA
;
6243 /* There are no read-only thread-local sections. */
6244 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6246 /* Note that this would be *just* SECCAT_BSS, except that there's
6247 no concept of a read-only thread-local-data section. */
6248 if (ret
== SECCAT_BSS
6249 || (flag_zero_initialized_in_bss
6250 && initializer_zerop (DECL_INITIAL (decl
))))
6256 /* If the target uses small data sections, select it. */
6257 else if (targetm
.in_small_data_p (decl
))
6259 if (ret
== SECCAT_BSS
)
6261 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6262 ret
= SECCAT_SRODATA
;
6271 decl_readonly_section_1 (enum section_category category
)
6276 case SECCAT_RODATA_MERGE_STR
:
6277 case SECCAT_RODATA_MERGE_STR_INIT
:
6278 case SECCAT_RODATA_MERGE_CONST
:
6279 case SECCAT_SRODATA
:
6287 decl_readonly_section (const_tree decl
, int reloc
)
6289 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6292 /* Select a section based on the above categorization. */
6295 default_elf_select_section (tree decl
, int reloc
,
6296 unsigned HOST_WIDE_INT align
)
6299 switch (categorize_decl_for_section (decl
, reloc
))
6302 /* We're not supposed to be called on FUNCTION_DECLs. */
6305 return readonly_data_section
;
6306 case SECCAT_RODATA_MERGE_STR
:
6307 return mergeable_string_section (decl
, align
, 0);
6308 case SECCAT_RODATA_MERGE_STR_INIT
:
6309 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6310 case SECCAT_RODATA_MERGE_CONST
:
6311 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6312 case SECCAT_SRODATA
:
6316 return data_section
;
6317 case SECCAT_DATA_REL
:
6318 sname
= ".data.rel";
6320 case SECCAT_DATA_REL_LOCAL
:
6321 sname
= ".data.rel.local";
6323 case SECCAT_DATA_REL_RO
:
6324 sname
= ".data.rel.ro";
6326 case SECCAT_DATA_REL_RO_LOCAL
:
6327 sname
= ".data.rel.ro.local";
6352 return get_named_section (decl
, sname
, reloc
);
6355 /* Construct a unique section name based on the decl name and the
6356 categorization performed above. */
6359 default_unique_section (tree decl
, int reloc
)
6361 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6362 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6363 const char *prefix
, *name
, *linkonce
;
6366 switch (categorize_decl_for_section (decl
, reloc
))
6369 prefix
= one_only
? ".t" : ".text";
6372 case SECCAT_RODATA_MERGE_STR
:
6373 case SECCAT_RODATA_MERGE_STR_INIT
:
6374 case SECCAT_RODATA_MERGE_CONST
:
6375 prefix
= one_only
? ".r" : ".rodata";
6377 case SECCAT_SRODATA
:
6378 prefix
= one_only
? ".s2" : ".sdata2";
6381 prefix
= one_only
? ".d" : ".data";
6383 case SECCAT_DATA_REL
:
6384 prefix
= one_only
? ".d.rel" : ".data.rel";
6386 case SECCAT_DATA_REL_LOCAL
:
6387 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6389 case SECCAT_DATA_REL_RO
:
6390 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6392 case SECCAT_DATA_REL_RO_LOCAL
:
6393 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6396 prefix
= one_only
? ".s" : ".sdata";
6399 prefix
= one_only
? ".b" : ".bss";
6402 prefix
= one_only
? ".sb" : ".sbss";
6405 prefix
= one_only
? ".td" : ".tdata";
6408 prefix
= one_only
? ".tb" : ".tbss";
6414 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6415 name
= targetm
.strip_name_encoding (name
);
6417 /* If we're using one_only, then there needs to be a .gnu.linkonce
6418 prefix to the section name. */
6419 linkonce
= one_only
? ".gnu.linkonce" : "";
6421 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6423 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6426 /* Like compute_reloc_for_constant, except for an RTX. The return value
6427 is a mask for which bit 1 indicates a global relocation, and bit 0
6428 indicates a local relocation. */
6431 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6433 int *preloc
= (int *) data
;
6436 switch (GET_CODE (x
))
6439 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6452 compute_reloc_for_rtx (rtx x
)
6456 switch (GET_CODE (x
))
6462 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6471 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6473 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6475 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6476 return data_section
;
6478 return readonly_data_section
;
6482 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6483 unsigned HOST_WIDE_INT align
)
6485 int reloc
= compute_reloc_for_rtx (x
);
6487 /* ??? Handle small data here somehow. */
6489 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6492 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6494 return get_named_section (NULL
, ".data.rel.ro", 3);
6497 return mergeable_constant_section (mode
, align
, 0);
6500 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6503 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6508 /* Careful not to prod global register variables. */
6511 symbol
= XEXP (rtl
, 0);
6512 if (GET_CODE (symbol
) != SYMBOL_REF
)
6515 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6516 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6517 flags
|= SYMBOL_FLAG_FUNCTION
;
6518 if (targetm
.binds_local_p (decl
))
6519 flags
|= SYMBOL_FLAG_LOCAL
;
6520 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6521 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6522 else if (targetm
.in_small_data_p (decl
))
6523 flags
|= SYMBOL_FLAG_SMALL
;
6524 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6525 being PUBLIC, the thing *must* be defined in this translation unit.
6526 Prevent this buglet from being propagated into rtl code as well. */
6527 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6528 flags
|= SYMBOL_FLAG_EXTERNAL
;
6530 SYMBOL_REF_FLAGS (symbol
) = flags
;
6533 /* By default, we do nothing for encode_section_info, so we need not
6534 do anything but discard the '*' marker. */
6537 default_strip_name_encoding (const char *str
)
6539 return str
+ (*str
== '*');
6542 #ifdef ASM_OUTPUT_DEF
6543 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6544 anchor relative to ".", the current section position. */
6547 default_asm_output_anchor (rtx symbol
)
6551 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6552 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6553 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6557 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6560 default_use_anchors_for_symbol_p (const_rtx symbol
)
6565 /* Don't use anchors for mergeable sections. The linker might move
6566 the objects around. */
6567 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6568 if (sect
->common
.flags
& SECTION_MERGE
)
6571 /* Don't use anchors for small data sections. The small data register
6572 acts as an anchor for such sections. */
6573 if (sect
->common
.flags
& SECTION_SMALL
)
6576 decl
= SYMBOL_REF_DECL (symbol
);
6577 if (decl
&& DECL_P (decl
))
6579 /* Don't use section anchors for decls that might be defined by
6581 if (!targetm
.binds_local_p (decl
))
6584 /* Don't use section anchors for decls that will be placed in a
6585 small data section. */
6586 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6587 one above. The problem is that we only use SECTION_SMALL for
6588 sections that should be marked as small in the section directive. */
6589 if (targetm
.in_small_data_p (decl
))
6595 /* Return true when RESOLUTION indicate that symbol will be bound to the
6596 definition provided by current .o file. */
6599 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6601 return (resolution
== LDPR_PREVAILING_DEF
6602 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6603 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6606 /* Return true when RESOLUTION indicate that symbol will be bound locally
6607 within current executable or DSO. */
6610 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6612 return (resolution
== LDPR_PREVAILING_DEF
6613 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6614 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6615 || resolution
== LDPR_PREEMPTED_REG
6616 || resolution
== LDPR_PREEMPTED_IR
6617 || resolution
== LDPR_RESOLVED_IR
6618 || resolution
== LDPR_RESOLVED_EXEC
);
6621 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6622 wrt cross-module name binding. */
6625 default_binds_local_p (const_tree exp
)
6627 return default_binds_local_p_1 (exp
, flag_shlib
);
6631 default_binds_local_p_1 (const_tree exp
, int shlib
)
6634 bool resolved_locally
= false;
6635 bool resolved_to_local_def
= false;
6637 /* With resolution file in hands, take look into resolutions.
6638 We can't just return true for resolved_locally symbols,
6639 because dynamic linking might overwrite symbols
6640 in shared libraries. */
6641 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6642 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6644 struct varpool_node
*vnode
= varpool_get_node (exp
);
6645 if (vnode
&& resolution_local_p (vnode
->symbol
.resolution
))
6646 resolved_locally
= true;
6648 && resolution_to_local_definition_p (vnode
->symbol
.resolution
))
6649 resolved_to_local_def
= true;
6651 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6653 struct cgraph_node
*node
= cgraph_get_node (exp
);
6655 && resolution_local_p (node
->symbol
.resolution
))
6656 resolved_locally
= true;
6658 && resolution_to_local_definition_p (node
->symbol
.resolution
))
6659 resolved_to_local_def
= true;
6662 /* A non-decl is an entry in the constant pool. */
6665 /* Weakrefs may not bind locally, even though the weakref itself is always
6666 static and therefore local. Similarly, the resolver for ifunc functions
6667 might resolve to a non-local function.
6668 FIXME: We can resolve the weakref case more curefuly by looking at the
6670 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6671 || (TREE_CODE (exp
) == FUNCTION_DECL
6672 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6674 /* Static variables are always local. */
6675 else if (! TREE_PUBLIC (exp
))
6677 /* A variable is local if the user has said explicitly that it will
6679 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6680 || resolved_to_local_def
)
6681 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6683 /* Variables defined outside this object might not be local. */
6684 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6686 /* If defined in this object and visibility is not default, must be
6688 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6690 /* Default visibility weak data can be overridden by a strong symbol
6691 in another module and so are not local. */
6692 else if (DECL_WEAK (exp
)
6693 && !resolved_locally
)
6695 /* If PIC, then assume that any global name can be overridden by
6696 symbols resolved from other modules. */
6699 /* Uninitialized COMMON variable may be unified with symbols
6700 resolved from other modules. */
6701 else if (DECL_COMMON (exp
)
6702 && !resolved_locally
6703 && (DECL_INITIAL (exp
) == NULL
6704 || DECL_INITIAL (exp
) == error_mark_node
))
6706 /* Otherwise we're left with initialized (or non-common) global data
6707 which is of necessity defined locally. */
6714 /* Return true when references to DECL must bind to current definition in
6717 The condition is usually equivalent to whether the function binds to the
6718 current module (shared library or executable), that is to binds_local_p.
6719 We use this fact to avoid need for another target hook and implement
6720 the logic using binds_local_p and just special cases where
6721 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6722 the weak definitions (that can be overwritten at linktime by other
6723 definition from different object file) and when resolution info is available
6724 we simply use the knowledge passed to us by linker plugin. */
6726 decl_binds_to_current_def_p (tree decl
)
6728 gcc_assert (DECL_P (decl
));
6729 if (!TREE_PUBLIC (decl
))
6731 if (!targetm
.binds_local_p (decl
))
6733 /* When resolution is available, just use it. */
6734 if (TREE_CODE (decl
) == VAR_DECL
6735 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6737 struct varpool_node
*vnode
= varpool_get_node (decl
);
6739 && vnode
->symbol
.resolution
!= LDPR_UNKNOWN
)
6740 return resolution_to_local_definition_p (vnode
->symbol
.resolution
);
6742 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6744 struct cgraph_node
*node
= cgraph_get_node (decl
);
6746 && node
->symbol
.resolution
!= LDPR_UNKNOWN
)
6747 return resolution_to_local_definition_p (node
->symbol
.resolution
);
6749 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6750 binds locally but still can be overwritten).
6751 This rely on fact that binds_local_p behave as decl_replaceable_p
6752 for all other declaration types. */
6753 return !DECL_WEAK (decl
);
6756 /* A replaceable function or variable is one which may be replaced
6757 at link-time with an entirely different definition, provided that the
6758 replacement has the same type. For example, functions declared
6759 with __attribute__((weak)) on most systems are replaceable.
6761 COMDAT functions are not replaceable, since all definitions of the
6762 function must be equivalent. It is important that COMDAT functions
6763 not be treated as replaceable so that use of C++ template
6764 instantiations is not penalized. */
6767 decl_replaceable_p (tree decl
)
6769 gcc_assert (DECL_P (decl
));
6770 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6772 return !decl_binds_to_current_def_p (decl
);
6775 /* Default function to output code that will globalize a label. A
6776 target must define GLOBAL_ASM_OP or provide its own function to
6777 globalize a label. */
6778 #ifdef GLOBAL_ASM_OP
6780 default_globalize_label (FILE * stream
, const char *name
)
6782 fputs (GLOBAL_ASM_OP
, stream
);
6783 assemble_name (stream
, name
);
6784 putc ('\n', stream
);
6786 #endif /* GLOBAL_ASM_OP */
6788 /* Default function to output code that will globalize a declaration. */
6790 default_globalize_decl_name (FILE * stream
, tree decl
)
6792 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6793 targetm
.asm_out
.globalize_label (stream
, name
);
6796 /* Default function to output a label for unwind information. The
6797 default is to do nothing. A target that needs nonlocal labels for
6798 unwind information must provide its own function to do this. */
6800 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6801 tree decl ATTRIBUTE_UNUSED
,
6802 int for_eh ATTRIBUTE_UNUSED
,
6803 int empty ATTRIBUTE_UNUSED
)
6807 /* Default function to output a label to divide up the exception table.
6808 The default is to do nothing. A target that needs/wants to divide
6809 up the table must provide it's own function to do this. */
6811 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6815 /* This is how to output an internal numbered label where PREFIX is
6816 the class of label and LABELNO is the number within the class. */
6819 default_generate_internal_label (char *buf
, const char *prefix
,
6820 unsigned long labelno
)
6822 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6825 /* This is how to output an internal numbered label where PREFIX is
6826 the class of label and LABELNO is the number within the class. */
6829 default_internal_label (FILE *stream
, const char *prefix
,
6830 unsigned long labelno
)
6832 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6833 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6834 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6838 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6841 default_asm_declare_constant_name (FILE *file
, const char *name
,
6842 const_tree exp ATTRIBUTE_UNUSED
,
6843 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6845 assemble_label (file
, name
);
6848 /* This is the default behavior at the beginning of a file. It's
6849 controlled by two other target-hook toggles. */
6851 default_file_start (void)
6853 if (targetm
.asm_file_start_app_off
6854 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6855 fputs (ASM_APP_OFF
, asm_out_file
);
6857 if (targetm
.asm_file_start_file_directive
)
6858 output_file_directive (asm_out_file
, main_input_filename
);
6861 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6862 which emits a special section directive used to indicate whether or
6863 not this object file needs an executable stack. This is primarily
6864 a GNU extension to ELF but could be used on other targets. */
6866 int trampolines_created
;
6869 file_end_indicate_exec_stack (void)
6871 unsigned int flags
= SECTION_DEBUG
;
6872 if (trampolines_created
)
6873 flags
|= SECTION_CODE
;
6875 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6878 /* Emit a special section directive to indicate that this object file
6879 was compiled with -fsplit-stack. This is used to let the linker
6880 detect calls between split-stack code and non-split-stack code, so
6881 that it can modify the split-stack code to allocate a sufficiently
6882 large stack. We emit another special section if there are any
6883 functions in this file which have the no_split_stack attribute, to
6884 prevent the linker from warning about being unable to convert the
6885 functions if they call non-split-stack code. */
6888 file_end_indicate_split_stack (void)
6890 if (flag_split_stack
)
6892 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6894 if (saw_no_split_stack
)
6895 switch_to_section (get_section (".note.GNU-no-split-stack",
6896 SECTION_DEBUG
, NULL
));
6900 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6901 a get_unnamed_section callback. */
6904 output_section_asm_op (const void *directive
)
6906 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6909 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6910 the current section is NEW_SECTION. */
6913 switch_to_section (section
*new_section
)
6915 if (in_section
== new_section
)
6918 if (new_section
->common
.flags
& SECTION_FORGET
)
6921 in_section
= new_section
;
6923 switch (SECTION_STYLE (new_section
))
6926 targetm
.asm_out
.named_section (new_section
->named
.name
,
6927 new_section
->named
.common
.flags
,
6928 new_section
->named
.decl
);
6931 case SECTION_UNNAMED
:
6932 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6935 case SECTION_NOSWITCH
:
6940 new_section
->common
.flags
|= SECTION_DECLARED
;
6943 /* If block symbol SYMBOL has not yet been assigned an offset, place
6944 it at the end of its block. */
6947 place_block_symbol (rtx symbol
)
6949 unsigned HOST_WIDE_INT size
, mask
, offset
;
6950 struct constant_descriptor_rtx
*desc
;
6951 unsigned int alignment
;
6952 struct object_block
*block
;
6955 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6956 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6959 /* Work out the symbol's size and alignment. */
6960 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6962 desc
= SYMBOL_REF_CONSTANT (symbol
);
6963 alignment
= desc
->align
;
6964 size
= GET_MODE_SIZE (desc
->mode
);
6966 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6968 decl
= SYMBOL_REF_DECL (symbol
);
6969 alignment
= DECL_ALIGN (decl
);
6970 size
= get_constant_size (DECL_INITIAL (decl
));
6974 decl
= SYMBOL_REF_DECL (symbol
);
6975 alignment
= DECL_ALIGN (decl
);
6976 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6977 if (flag_asan
&& asan_protect_global (decl
))
6978 size
+= asan_red_zone_size (size
);
6981 /* Calculate the object's offset from the start of the block. */
6982 block
= SYMBOL_REF_BLOCK (symbol
);
6983 mask
= alignment
/ BITS_PER_UNIT
- 1;
6984 offset
= (block
->size
+ mask
) & ~mask
;
6985 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6987 /* Record the block's new alignment and size. */
6988 block
->alignment
= MAX (block
->alignment
, alignment
);
6989 block
->size
= offset
+ size
;
6991 vec_safe_push (block
->objects
, symbol
);
6994 /* Return the anchor that should be used to address byte offset OFFSET
6995 from the first object in BLOCK. MODEL is the TLS model used
6999 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7000 enum tls_model model
)
7003 unsigned int begin
, middle
, end
;
7004 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7007 /* Work out the anchor's offset. Use an offset of 0 for the first
7008 anchor so that we don't pessimize the case where we take the address
7009 of a variable at the beginning of the block. This is particularly
7010 useful when a block has only one variable assigned to it.
7012 We try to place anchors RANGE bytes apart, so there can then be
7013 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7014 a ptr_mode offset. With some target settings, the lowest such
7015 anchor might be out of range for the lowest ptr_mode offset;
7016 likewise the highest anchor for the highest offset. Use anchors
7017 at the extreme ends of the ptr_mode range in such cases.
7019 All arithmetic uses unsigned integers in order to avoid
7021 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7022 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7023 range
= max_offset
- min_offset
+ 1;
7028 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7031 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7032 delta
-= delta
% range
;
7035 offset
= (HOST_WIDE_INT
) (-delta
);
7039 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7040 delta
-= delta
% range
;
7041 if (delta
> bias
- 1)
7043 offset
= (HOST_WIDE_INT
) delta
;
7047 /* Do a binary search to see if there's already an anchor we can use.
7048 Set BEGIN to the new anchor's index if not. */
7050 end
= vec_safe_length (block
->anchors
);
7051 while (begin
!= end
)
7053 middle
= (end
+ begin
) / 2;
7054 anchor
= (*block
->anchors
)[middle
];
7055 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7057 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7059 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7061 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7067 /* Create a new anchor with a unique label. */
7068 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7069 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7070 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7071 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7073 /* Insert it at index BEGIN. */
7074 vec_safe_insert (block
->anchors
, begin
, anchor
);
7078 /* Output the objects in BLOCK. */
7081 output_object_block (struct object_block
*block
)
7083 struct constant_descriptor_rtx
*desc
;
7085 HOST_WIDE_INT offset
;
7089 if (!block
->objects
)
7092 /* Switch to the section and make sure that the first byte is
7093 suitably aligned. */
7094 switch_to_section (block
->sect
);
7095 assemble_align (block
->alignment
);
7097 /* Define the values of all anchors relative to the current section
7099 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7100 targetm
.asm_out
.output_anchor (symbol
);
7102 /* Output the objects themselves. */
7104 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7106 /* Move to the object's offset, padding with zeros if necessary. */
7107 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7108 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7109 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7111 desc
= SYMBOL_REF_CONSTANT (symbol
);
7112 output_constant_pool_1 (desc
, 1);
7113 offset
+= GET_MODE_SIZE (desc
->mode
);
7115 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7117 decl
= SYMBOL_REF_DECL (symbol
);
7118 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7120 offset
+= get_constant_size (DECL_INITIAL (decl
));
7124 decl
= SYMBOL_REF_DECL (symbol
);
7125 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7126 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7131 /* A htab_traverse callback used to call output_object_block for
7132 each member of object_block_htab. */
7135 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7137 output_object_block ((struct object_block
*) (*slot
));
7141 /* Output the definitions of all object_blocks. */
7144 output_object_blocks (void)
7146 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7149 /* This function provides a possible implementation of the
7150 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7151 by -frecord-gcc-switches it creates a new mergeable, string section in the
7152 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7153 contains the switches in ASCII format.
7155 FIXME: This code does not correctly handle double quote characters
7156 that appear inside strings, (it strips them rather than preserving them).
7157 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7158 characters - instead it treats them as sub-string separators. Since
7159 we want to emit NUL strings terminators into the object file we have to use
7163 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7167 case SWITCH_TYPE_PASSED
:
7168 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7169 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7172 case SWITCH_TYPE_DESCRIPTIVE
:
7175 /* Distinguish between invocations where name is NULL. */
7176 static bool started
= false;
7182 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7186 | (SECTION_ENTSIZE
& 1),
7188 switch_to_section (sec
);
7197 /* The return value is currently ignored by the caller, but must be 0.
7198 For -fverbose-asm the return value would be the number of characters
7199 emitted into the assembler file. */
7203 /* Emit text to declare externally defined symbols. It is needed to
7204 properly support non-default visibility. */
7206 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7208 const char *name ATTRIBUTE_UNUSED
)
7210 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7211 set in order to avoid putting out names that are never really
7213 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7214 && targetm
.binds_local_p (decl
))
7215 maybe_assemble_visibility (decl
);
7218 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7221 default_asm_output_source_filename (FILE *file
, const char *name
)
7223 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7224 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7226 fprintf (file
, "\t.file\t");
7227 output_quoted_string (file
, name
);
7232 /* Output a file name in the form wanted by System V. */
7235 output_file_directive (FILE *asm_file
, const char *input_name
)
7240 if (input_name
== NULL
)
7241 input_name
= "<stdin>";
7243 input_name
= remap_debug_filename (input_name
);
7245 len
= strlen (input_name
);
7246 na
= input_name
+ len
;
7248 /* NA gets INPUT_NAME sans directory names. */
7249 while (na
> input_name
)
7251 if (IS_DIR_SEPARATOR (na
[-1]))
7256 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7259 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7262 make_debug_expr_from_rtl (const_rtx exp
)
7264 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7265 enum machine_mode mode
= GET_MODE (exp
);
7268 DECL_ARTIFICIAL (ddecl
) = 1;
7269 if (REG_P (exp
) && REG_EXPR (exp
))
7270 type
= TREE_TYPE (REG_EXPR (exp
));
7271 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7272 type
= TREE_TYPE (MEM_EXPR (exp
));
7275 if (type
&& TYPE_MODE (type
) == mode
)
7276 TREE_TYPE (ddecl
) = type
;
7278 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7279 DECL_MODE (ddecl
) = mode
;
7280 dval
= gen_rtx_DEBUG_EXPR (mode
);
7281 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7282 SET_DECL_RTL (ddecl
, dval
);
7286 #ifdef ELF_ASCII_ESCAPES
7287 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7290 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7295 fputs (STRING_ASM_OP
, f
);
7300 escape
= ELF_ASCII_ESCAPES
[c
];
7307 /* TODO: Print in hex with fast function, important for -flto. */
7308 fprintf (f
, "\\%03o", c
);
7321 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7324 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7326 const char *limit
= s
+ len
;
7327 const char *last_null
= NULL
;
7328 unsigned bytes_in_chunk
= 0;
7332 for (; s
< limit
; s
++)
7336 if (bytes_in_chunk
>= 60)
7345 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7352 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7354 if (bytes_in_chunk
> 0)
7361 default_elf_asm_output_limited_string (f
, s
);
7366 if (bytes_in_chunk
== 0)
7367 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7370 escape
= ELF_ASCII_ESCAPES
[c
];
7378 /* TODO: Print in hex with fast function, important for -flto. */
7379 fprintf (f
, "\\%03o", c
);
7380 bytes_in_chunk
+= 4;
7385 bytes_in_chunk
+= 2;
7392 if (bytes_in_chunk
> 0)
7400 static GTY(()) section
*elf_init_array_section
;
7401 static GTY(()) section
*elf_fini_array_section
;
7404 get_elf_initfini_array_priority_section (int priority
,
7408 if (priority
!= DEFAULT_INIT_PRIORITY
)
7411 sprintf (buf
, "%s.%.5u",
7412 constructor_p
? ".init_array" : ".fini_array",
7414 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7420 if (elf_init_array_section
== NULL
)
7421 elf_init_array_section
7422 = get_section (".init_array",
7423 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7424 sec
= elf_init_array_section
;
7428 if (elf_fini_array_section
== NULL
)
7429 elf_fini_array_section
7430 = get_section (".fini_array",
7431 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7432 sec
= elf_fini_array_section
;
7438 /* Use .init_array section for constructors. */
7441 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7443 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7445 assemble_addr_to_section (symbol
, sec
);
7448 /* Use .fini_array section for destructors. */
7451 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7453 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7455 assemble_addr_to_section (symbol
, sec
);
7458 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7460 This is a bit of a cheat. The real default is a no-op, but this
7461 hook is the default for all targets with a .ident directive. */
7464 default_asm_output_ident_directive (const char *ident_str
)
7466 const char *ident_asm_op
= "\t.ident\t";
7468 /* If we are still in the front end, do not write out the string
7469 to asm_out_file. Instead, add a fake top-level asm statement.
7470 This allows the front ends to use this hook without actually
7471 writing to asm_out_file, to handle #ident or Pragma Ident. */
7472 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7474 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7475 add_asm_node (build_string (strlen (buf
), buf
));
7478 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7481 #include "gt-varasm.h"