1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2020 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
38 #include "stringpool.h"
42 #include "diagnostic-core.h"
43 #include "fold-const.h"
44 #include "stor-layout.h"
52 #include "langhooks.h"
54 #include "common/common-target.h"
55 #include "stringpool.h"
59 #include "file-prefix-map.h" /* remap_debug_filename() */
61 #ifdef XCOFF_DEBUGGING_INFO
62 #include "xcoffout.h" /* Needed for external data declarations. */
65 /* The (assembler) name of the first globally-visible object output. */
66 extern GTY(()) const char *first_global_object_name
;
67 extern GTY(()) const char *weak_global_object_name
;
69 const char *first_global_object_name
;
70 const char *weak_global_object_name
;
73 class constant_descriptor_rtx
;
74 struct rtx_constant_pool
;
76 #define n_deferred_constants (crtl->varasm.deferred_constants)
78 /* Number for making the label on the next
79 constant that is stored in memory. */
81 static GTY(()) int const_labelno
;
83 /* Carry information from ASM_DECLARE_OBJECT_NAME
84 to ASM_FINISH_DECLARE_OBJECT. */
86 int size_directive_output
;
88 /* The last decl for which assemble_variable was called,
89 if it did ASM_DECLARE_OBJECT_NAME.
90 If the last call to assemble_variable didn't do that,
93 tree last_assemble_variable_decl
;
95 /* The following global variable indicates if the first basic block
96 in a function belongs to the cold partition or not. */
98 bool first_function_block_is_cold
;
100 /* Whether we saw any functions with no_split_stack. */
102 static bool saw_no_split_stack
;
104 static const char *strip_reg_name (const char *);
105 static int contains_pointers_p (tree
);
106 #ifdef ASM_OUTPUT_EXTERNAL
107 static bool incorporeal_function_p (tree
);
109 static void decode_addr_const (tree
, class addr_const
*);
110 static hashval_t
const_hash_1 (const tree
);
111 static int compare_constant (const tree
, const tree
);
112 static void output_constant_def_contents (rtx
);
113 static void output_addressed_constants (tree
, int);
114 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
115 unsigned int, bool, bool);
116 static void globalize_decl (tree
);
117 static bool decl_readonly_section_1 (enum section_category
);
118 #ifdef BSS_SECTION_ASM_OP
119 #ifdef ASM_OUTPUT_ALIGNED_BSS
120 static void asm_output_aligned_bss (FILE *, tree
, const char *,
121 unsigned HOST_WIDE_INT
, int)
124 #endif /* BSS_SECTION_ASM_OP */
125 static void mark_weak (tree
);
126 static void output_constant_pool (const char *, tree
);
127 static void handle_vtv_comdat_section (section
*, const_tree
);
129 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
130 section
*text_section
;
131 section
*data_section
;
132 section
*readonly_data_section
;
133 section
*sdata_section
;
134 section
*ctors_section
;
135 section
*dtors_section
;
136 section
*bss_section
;
137 section
*sbss_section
;
139 /* Various forms of common section. All are guaranteed to be nonnull. */
140 section
*tls_comm_section
;
141 section
*comm_section
;
142 section
*lcomm_section
;
144 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
146 section
*bss_noswitch_section
;
148 /* The section that holds the main exception table, when known. The section
149 is set either by the target's init_sections hook or by the first call to
150 switch_to_exception_section. */
151 section
*exception_section
;
153 /* The section that holds the DWARF2 frame unwind information, when known.
154 The section is set either by the target's init_sections hook or by the
155 first call to switch_to_eh_frame_section. */
156 section
*eh_frame_section
;
158 /* asm_out_file's current section. This is NULL if no section has yet
159 been selected or if we lose track of what the current section is. */
162 /* True if code for the current function is currently being directed
163 at the cold section. */
164 bool in_cold_section_p
;
166 /* The following global holds the "function name" for the code in the
167 cold section of a function, if hot/cold function splitting is enabled
168 and there was actually code that went into the cold section. A
169 pseudo function name is needed for the cold section of code for some
170 debugging tools that perform symbolization. */
171 tree cold_function_name
= NULL_TREE
;
173 /* A linked list of all the unnamed sections. */
174 static GTY(()) section
*unnamed_sections
;
176 /* Return a nonzero value if DECL has a section attribute. */
177 #define IN_NAMED_SECTION(DECL) \
178 (VAR_OR_FUNCTION_DECL_P (DECL) && DECL_SECTION_NAME (DECL) != NULL)
180 struct section_hasher
: ggc_ptr_hash
<section
>
182 typedef const char *compare_type
;
184 static hashval_t
hash (section
*);
185 static bool equal (section
*, const char *);
188 /* Hash table of named sections. */
189 static GTY(()) hash_table
<section_hasher
> *section_htab
;
191 struct object_block_hasher
: ggc_ptr_hash
<object_block
>
193 typedef const section
*compare_type
;
195 static hashval_t
hash (object_block
*);
196 static bool equal (object_block
*, const section
*);
199 /* A table of object_blocks, indexed by section. */
200 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
202 /* The next number to use for internal anchor labels. */
203 static GTY(()) int anchor_labelno
;
205 /* A pool of constants that can be shared between functions. */
206 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
208 /* Helper routines for maintaining section_htab. */
211 section_hasher::equal (section
*old
, const char *new_name
)
213 return strcmp (old
->named
.name
, new_name
) == 0;
217 section_hasher::hash (section
*old
)
219 return htab_hash_string (old
->named
.name
);
222 /* Return a hash value for section SECT. */
225 hash_section (section
*sect
)
227 if (sect
->common
.flags
& SECTION_NAMED
)
228 return htab_hash_string (sect
->named
.name
);
229 return sect
->common
.flags
& ~SECTION_DECLARED
;
232 /* Helper routines for maintaining object_block_htab. */
235 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
237 return old
->sect
== new_section
;
241 object_block_hasher::hash (object_block
*old
)
243 return hash_section (old
->sect
);
246 /* Return a new unnamed section with the given fields. */
249 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
254 sect
= ggc_alloc
<section
> ();
255 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
256 sect
->unnamed
.callback
= callback
;
257 sect
->unnamed
.data
= data
;
258 sect
->unnamed
.next
= unnamed_sections
;
260 unnamed_sections
= sect
;
264 /* Return a SECTION_NOSWITCH section with the given fields. */
267 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
271 sect
= ggc_alloc
<section
> ();
272 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
273 sect
->noswitch
.callback
= callback
;
278 /* Return the named section structure associated with NAME. Create
279 a new section with the given fields if no such structure exists. */
282 get_section (const char *name
, unsigned int flags
, tree decl
)
284 section
*sect
, **slot
;
286 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
288 flags
|= SECTION_NAMED
;
291 sect
= ggc_alloc
<section
> ();
292 sect
->named
.common
.flags
= flags
;
293 sect
->named
.name
= ggc_strdup (name
);
294 sect
->named
.decl
= decl
;
300 /* It is fine if one of the sections has SECTION_NOTYPE as long as
301 the other has none of the contrary flags (see the logic at the end
302 of default_section_type_flags, below). */
303 if (((sect
->common
.flags
^ flags
) & SECTION_NOTYPE
)
304 && !((sect
->common
.flags
| flags
)
305 & (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
| SECTION_ENTSIZE
306 | (HAVE_COMDAT_GROUP
? SECTION_LINKONCE
: 0))))
308 sect
->common
.flags
|= SECTION_NOTYPE
;
309 flags
|= SECTION_NOTYPE
;
311 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
312 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
314 /* It is fine if one of the section flags is
315 SECTION_WRITE | SECTION_RELRO and the other has none of these
316 flags (i.e. read-only) in named sections and either the
317 section hasn't been declared yet or has been declared as writable.
318 In that case just make sure the resulting flags are
319 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
321 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
322 == (SECTION_WRITE
| SECTION_RELRO
)
323 && (sect
->common
.flags
324 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
325 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
326 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
327 || (sect
->common
.flags
& SECTION_WRITE
)))
329 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
332 /* Sanity check user variables for flag changes. */
333 if (sect
->named
.decl
!= NULL
334 && DECL_P (sect
->named
.decl
)
335 && decl
!= sect
->named
.decl
)
337 if (decl
!= NULL
&& DECL_P (decl
))
338 error ("%+qD causes a section type conflict with %qD",
339 decl
, sect
->named
.decl
);
341 error ("section type conflict with %qD", sect
->named
.decl
);
342 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
343 "%qD was declared here", sect
->named
.decl
);
345 else if (decl
!= NULL
&& DECL_P (decl
))
346 error ("%+qD causes a section type conflict", decl
);
348 error ("section type conflict");
349 /* Make sure we don't error about one section multiple times. */
350 sect
->common
.flags
|= SECTION_OVERRIDE
;
356 /* Return true if the current compilation mode benefits from having
357 objects grouped into blocks. */
360 use_object_blocks_p (void)
362 return flag_section_anchors
;
365 /* Return the object_block structure for section SECT. Create a new
366 structure if we haven't created one already. Return null if SECT
367 itself is null. Return also null for mergeable sections since
368 section anchors can't be used in mergeable sections anyway,
369 because the linker might move objects around, and using the
370 object blocks infrastructure in that case is both a waste and a
371 maintenance burden. */
373 static struct object_block
*
374 get_block_for_section (section
*sect
)
376 struct object_block
*block
;
381 if (sect
->common
.flags
& SECTION_MERGE
)
385 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
390 block
= ggc_cleared_alloc
<object_block
> ();
397 /* Create a symbol with label LABEL and place it at byte offset
398 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
399 is not yet known. LABEL must be a garbage-collected string. */
402 create_block_symbol (const char *label
, struct object_block
*block
,
403 HOST_WIDE_INT offset
)
408 /* Create the extended SYMBOL_REF. */
409 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
410 symbol
= (rtx
) ggc_internal_alloc (size
);
412 /* Initialize the normal SYMBOL_REF fields. */
413 memset (symbol
, 0, size
);
414 PUT_CODE (symbol
, SYMBOL_REF
);
415 PUT_MODE (symbol
, Pmode
);
416 XSTR (symbol
, 0) = label
;
417 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
419 /* Initialize the block_symbol stuff. */
420 SYMBOL_REF_BLOCK (symbol
) = block
;
421 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
426 /* Return a section with a particular name and with whatever SECTION_*
427 flags section_type_flags deems appropriate. The name of the section
428 is taken from NAME if nonnull, otherwise it is taken from DECL's
429 DECL_SECTION_NAME. DECL is the decl associated with the section
430 (see the section comment for details) and RELOC is as for
431 section_type_flags. */
434 get_named_section (tree decl
, const char *name
, int reloc
)
440 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
441 name
= DECL_SECTION_NAME (decl
);
444 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
445 return get_section (name
, flags
, decl
);
448 /* Worker for resolve_unique_section. */
451 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
453 n
->implicit_section
= true;
457 /* If required, set DECL_SECTION_NAME to a unique name. */
460 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
461 int flag_function_or_data_sections
)
463 if (DECL_SECTION_NAME (decl
) == NULL
464 && targetm_common
.have_named_sections
465 && (flag_function_or_data_sections
466 || DECL_COMDAT_GROUP (decl
)))
468 targetm
.asm_out
.unique_section (decl
, reloc
);
469 if (DECL_SECTION_NAME (decl
))
470 symtab_node::get (decl
)->call_for_symbol_and_aliases
471 (set_implicit_section
, NULL
, true);
475 #ifdef BSS_SECTION_ASM_OP
477 #ifdef ASM_OUTPUT_ALIGNED_BSS
479 /* Utility function for targets to use in implementing
480 ASM_OUTPUT_ALIGNED_BSS.
481 ??? It is believed that this function will work in most cases so such
482 support is localized here. */
485 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
486 const char *name
, unsigned HOST_WIDE_INT size
,
489 switch_to_section (bss_section
);
490 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
491 #ifdef ASM_DECLARE_OBJECT_NAME
492 last_assemble_variable_decl
= decl
;
493 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
495 /* Standard thing is just output label for the object. */
496 ASM_OUTPUT_LABEL (file
, name
);
497 #endif /* ASM_DECLARE_OBJECT_NAME */
498 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
503 #endif /* BSS_SECTION_ASM_OP */
505 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
506 /* Return the hot section for function DECL. Return text_section for
510 hot_function_section (tree decl
)
512 if (decl
!= NULL_TREE
513 && DECL_SECTION_NAME (decl
) != NULL
514 && targetm_common
.have_named_sections
)
515 return get_named_section (decl
, NULL
, 0);
521 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
524 When DECL_SECTION_NAME is non-NULL and it is implicit section and
525 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
526 concatenate the name with NAMED_SECTION_SUFFIX.
527 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
530 get_named_text_section (tree decl
,
531 const char *text_section_name
,
532 const char *named_section_suffix
)
534 if (decl
&& DECL_SECTION_NAME (decl
))
536 if (named_section_suffix
)
538 const char *dsn
= DECL_SECTION_NAME (decl
);
539 const char *stripped_name
;
542 name
= (char *) alloca (strlen (dsn
) + 1);
546 stripped_name
= targetm
.strip_name_encoding (name
);
548 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
549 return get_named_section (decl
, buffer
, 0);
551 else if (symtab_node::get (decl
)->implicit_section
)
555 /* Do not try to split gnu_linkonce functions. This gets somewhat
557 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
559 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
560 name
= targetm
.strip_name_encoding (name
);
561 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
567 return get_named_section (decl
, text_section_name
, 0);
570 /* Choose named function section based on its frequency. */
573 default_function_section (tree decl
, enum node_frequency freq
,
574 bool startup
, bool exit
)
576 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
577 /* Old GNU linkers have buggy --gc-section support, which sometimes
578 results in .gcc_except_table* sections being garbage collected. */
580 && symtab_node::get (decl
)->implicit_section
)
584 if (!flag_reorder_functions
585 || !targetm_common
.have_named_sections
)
587 /* Startup code should go to startup subsection unless it is
588 unlikely executed (this happens especially with function splitting
589 where we can split away unnecessary parts of static constructors. */
590 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
592 /* During LTO the tp_first_run profiling will naturally place all
593 initialization code first. Using separate section is counter-productive
594 because startup only code may call functions which are no longer
597 || !cgraph_node::get (decl
)->tp_first_run
598 || !opt_for_fn (decl
, flag_profile_reorder_functions
))
599 return get_named_text_section (decl
, ".text.startup", NULL
);
604 /* Similarly for exit. */
605 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
606 return get_named_text_section (decl
, ".text.exit", NULL
);
608 /* Group cold functions together, similarly for hot code. */
611 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
612 return get_named_text_section (decl
, ".text.unlikely", NULL
);
613 case NODE_FREQUENCY_HOT
:
614 return get_named_text_section (decl
, ".text.hot", NULL
);
621 /* Return the section for function DECL.
623 If DECL is NULL_TREE, return the text section. We can be passed
624 NULL_TREE under some circumstances by dbxout.c at least.
626 If FORCE_COLD is true, return cold function section ignoring
627 the frequency info of cgraph_node. */
630 function_section_1 (tree decl
, bool force_cold
)
632 section
*section
= NULL
;
633 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
634 bool startup
= false, exit
= false;
638 struct cgraph_node
*node
= cgraph_node::get (decl
);
642 freq
= node
->frequency
;
643 startup
= node
->only_called_at_startup
;
644 exit
= node
->only_called_at_exit
;
648 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
650 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
651 if (decl
!= NULL_TREE
652 && DECL_SECTION_NAME (decl
) != NULL
)
654 if (targetm
.asm_out
.function_section
)
655 section
= targetm
.asm_out
.function_section (decl
, freq
,
659 return get_named_section (decl
, NULL
, 0);
662 return targetm
.asm_out
.select_section
663 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
664 symtab_node::get (decl
)->definition_alignment ());
666 if (targetm
.asm_out
.function_section
)
667 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
670 return hot_function_section (decl
);
674 /* Return the section for function DECL.
676 If DECL is NULL_TREE, return the text section. We can be passed
677 NULL_TREE under some circumstances by dbxout.c at least. */
680 function_section (tree decl
)
682 /* Handle cases where function splitting code decides
683 to put function entry point into unlikely executed section
684 despite the fact that the function itself is not cold
685 (i.e. it is called rarely but contains a hot loop that is
686 better to live in hot subsection for the code locality). */
687 return function_section_1 (decl
,
688 first_function_block_is_cold
);
691 /* Return the section for the current function, take IN_COLD_SECTION_P
695 current_function_section (void)
697 return function_section_1 (current_function_decl
, in_cold_section_p
);
700 /* Tell assembler to switch to unlikely-to-be-executed text section. */
703 unlikely_text_section (void)
705 return function_section_1 (current_function_decl
, true);
708 /* When called within a function context, return true if the function
709 has been assigned a cold text section and if SECT is that section.
710 When called outside a function context, return true if SECT is the
711 default cold section. */
714 unlikely_text_section_p (section
*sect
)
716 return sect
== function_section_1 (current_function_decl
, true);
719 /* Switch to the other function partition (if inside of hot section
720 into cold section, otherwise into the hot section). */
723 switch_to_other_text_partition (void)
725 in_cold_section_p
= !in_cold_section_p
;
726 switch_to_section (current_function_section ());
729 /* Return the read-only data section associated with function DECL. */
732 default_function_rodata_section (tree decl
)
734 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
736 const char *name
= DECL_SECTION_NAME (decl
);
738 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
744 dot
= strchr (name
+ 1, '.');
747 len
= strlen (dot
) + 8;
748 rname
= (char *) alloca (len
);
750 strcpy (rname
, ".rodata");
752 return get_section (rname
, SECTION_LINKONCE
, decl
);
754 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
755 else if (DECL_COMDAT_GROUP (decl
)
756 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
758 size_t len
= strlen (name
) + 1;
759 char *rname
= (char *) alloca (len
);
761 memcpy (rname
, name
, len
);
763 return get_section (rname
, SECTION_LINKONCE
, decl
);
765 /* For .text.foo we want to use .rodata.foo. */
766 else if (flag_function_sections
&& flag_data_sections
767 && strncmp (name
, ".text.", 6) == 0)
769 size_t len
= strlen (name
) + 1;
770 char *rname
= (char *) alloca (len
+ 2);
772 memcpy (rname
, ".rodata", 7);
773 memcpy (rname
+ 7, name
+ 5, len
- 5);
774 return get_section (rname
, 0, decl
);
778 return readonly_data_section
;
781 /* Return the read-only data section associated with function DECL
782 for targets where that section should be always the single
783 readonly data section. */
786 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
788 return readonly_data_section
;
791 /* A subroutine of mergeable_string_section and mergeable_constant_section. */
794 function_mergeable_rodata_prefix (void)
796 section
*s
= targetm
.asm_out
.function_rodata_section (current_function_decl
);
797 if (SECTION_STYLE (s
) == SECTION_NAMED
)
798 return s
->named
.name
;
800 return targetm
.asm_out
.mergeable_rodata_prefix
;
803 /* Return the section to use for string merging. */
806 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
807 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
808 unsigned int flags ATTRIBUTE_UNUSED
)
812 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
813 && TREE_CODE (decl
) == STRING_CST
814 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
816 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
817 && TREE_STRING_LENGTH (decl
) == len
)
819 scalar_int_mode mode
;
820 unsigned int modesize
;
824 const char *prefix
= function_mergeable_rodata_prefix ();
825 char *name
= (char *) alloca (strlen (prefix
) + 30);
827 mode
= SCALAR_INT_TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
828 modesize
= GET_MODE_BITSIZE (mode
);
829 if (modesize
>= 8 && modesize
<= 256
830 && (modesize
& (modesize
- 1)) == 0)
832 if (align
< modesize
)
835 if (!HAVE_LD_ALIGNED_SHF_MERGE
&& align
> 8)
836 return readonly_data_section
;
838 str
= TREE_STRING_POINTER (decl
);
839 unit
= GET_MODE_SIZE (mode
);
841 /* Check for embedded NUL characters. */
842 for (i
= 0; i
< len
; i
+= unit
)
844 for (j
= 0; j
< unit
; j
++)
845 if (str
[i
+ j
] != '\0')
850 if (i
== len
- unit
|| (unit
== 1 && i
== len
))
852 sprintf (name
, "%s.str%d.%d", prefix
,
853 modesize
/ 8, (int) (align
/ 8));
854 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
855 return get_section (name
, flags
, NULL
);
860 return readonly_data_section
;
863 /* Return the section to use for constant merging. */
866 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
867 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
868 unsigned int flags ATTRIBUTE_UNUSED
)
870 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
873 && known_le (GET_MODE_BITSIZE (mode
), align
)
876 && (align
& (align
- 1)) == 0
877 && (HAVE_LD_ALIGNED_SHF_MERGE
? 1 : align
== 8))
879 const char *prefix
= function_mergeable_rodata_prefix ();
880 char *name
= (char *) alloca (strlen (prefix
) + 30);
882 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
883 flags
|= (align
/ 8) | SECTION_MERGE
;
884 return get_section (name
, flags
, NULL
);
886 return readonly_data_section
;
889 /* Given NAME, a putative register name, discard any customary prefixes. */
892 strip_reg_name (const char *name
)
894 #ifdef REGISTER_PREFIX
895 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
896 name
+= strlen (REGISTER_PREFIX
);
898 if (name
[0] == '%' || name
[0] == '#')
903 /* The user has asked for a DECL to have a particular name. Set (or
904 change) it in such a way that we don't prefix an underscore to
907 set_user_assembler_name (tree decl
, const char *name
)
909 char *starred
= (char *) alloca (strlen (name
) + 2);
911 strcpy (starred
+ 1, name
);
912 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
913 SET_DECL_RTL (decl
, NULL_RTX
);
916 /* Decode an `asm' spec for a declaration as a register name.
917 Return the register number, or -1 if nothing specified,
918 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
919 or -3 if ASMSPEC is `cc' and is not recognized,
920 or -4 if ASMSPEC is `memory' and is not recognized.
921 Accept an exact spelling or a decimal number.
922 Prefixes such as % are optional. */
925 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
927 /* Presume just one register is clobbered. */
934 /* Get rid of confusing prefixes. */
935 asmspec
= strip_reg_name (asmspec
);
937 /* Allow a decimal number as a "register name". */
938 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
939 if (! ISDIGIT (asmspec
[i
]))
941 if (asmspec
[0] != 0 && i
< 0)
944 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
950 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
952 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
955 #ifdef OVERLAPPING_REGISTER_NAMES
959 const char *const name
;
962 } table
[] = OVERLAPPING_REGISTER_NAMES
;
964 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
966 && ! strcmp (asmspec
, table
[i
].name
))
968 *pnregs
= table
[i
].nregs
;
969 return table
[i
].number
;
972 #endif /* OVERLAPPING_REGISTER_NAMES */
974 #ifdef ADDITIONAL_REGISTER_NAMES
976 static const struct { const char *const name
; const int number
; } table
[]
977 = ADDITIONAL_REGISTER_NAMES
;
979 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
981 && ! strcmp (asmspec
, table
[i
].name
)
982 && reg_names
[table
[i
].number
][0])
983 return table
[i
].number
;
985 #endif /* ADDITIONAL_REGISTER_NAMES */
987 if (!strcmp (asmspec
, "memory"))
990 if (!strcmp (asmspec
, "cc"))
1000 decode_reg_name (const char *name
)
1003 return decode_reg_name_and_count (name
, &count
);
1007 /* Return true if DECL's initializer is suitable for a BSS section. */
1010 bss_initializer_p (const_tree decl
, bool named
)
1012 /* Do not put non-common constants into the .bss section, they belong in
1013 a readonly section, except when NAMED is true. */
1014 return ((!TREE_READONLY (decl
) || DECL_COMMON (decl
) || named
)
1015 && (DECL_INITIAL (decl
) == NULL
1016 /* In LTO we have no errors in program; error_mark_node is used
1017 to mark offlined constructors. */
1018 || (DECL_INITIAL (decl
) == error_mark_node
1020 || (flag_zero_initialized_in_bss
1021 && initializer_zerop (DECL_INITIAL (decl
)))));
1024 /* Compute the alignment of variable specified by DECL.
1025 DONT_OUTPUT_DATA is from assemble_variable. */
1028 align_variable (tree decl
, bool dont_output_data
)
1030 unsigned int align
= DECL_ALIGN (decl
);
1032 /* In the case for initialing an array whose length isn't specified,
1033 where we have not yet been able to do the layout,
1034 figure out the proper alignment now. */
1035 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1036 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1037 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1039 /* Some object file formats have a maximum alignment which they support.
1040 In particular, a.out format supports a maximum alignment of 4. */
1041 if (align
> MAX_OFILE_ALIGNMENT
)
1043 error ("alignment of %q+D is greater than maximum object "
1044 "file alignment %d", decl
,
1045 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1046 align
= MAX_OFILE_ALIGNMENT
;
1049 if (! DECL_USER_ALIGN (decl
))
1051 #ifdef DATA_ABI_ALIGNMENT
1052 unsigned int data_abi_align
1053 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1054 /* For backwards compatibility, don't assume the ABI alignment for
1056 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1057 align
= data_abi_align
;
1060 /* On some machines, it is good to increase alignment sometimes.
1061 But as DECL_ALIGN is used both for actually emitting the variable
1062 and for code accessing the variable as guaranteed alignment, we
1063 can only increase the alignment if it is a performance optimization
1064 if the references to it must bind to the current definition. */
1065 if (decl_binds_to_current_def_p (decl
)
1066 && !DECL_VIRTUAL_P (decl
))
1068 #ifdef DATA_ALIGNMENT
1069 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1070 /* Don't increase alignment too much for TLS variables - TLS space
1072 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1075 if (DECL_INITIAL (decl
) != 0
1076 /* In LTO we have no errors in program; error_mark_node is used
1077 to mark offlined constructors. */
1078 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1080 unsigned int const_align
1081 = targetm
.constant_alignment (DECL_INITIAL (decl
), align
);
1082 /* Don't increase alignment too much for TLS variables - TLS
1083 space is too precious. */
1084 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1085 align
= const_align
;
1090 /* Reset the alignment in case we have made it tighter, so we can benefit
1091 from it in get_pointer_alignment. */
1092 SET_DECL_ALIGN (decl
, align
);
1095 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1096 beyond what align_variable returned. */
1099 get_variable_align (tree decl
)
1101 unsigned int align
= DECL_ALIGN (decl
);
1103 /* For user aligned vars or static vars align_variable already did
1105 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1108 #ifdef DATA_ABI_ALIGNMENT
1109 if (DECL_THREAD_LOCAL_P (decl
))
1110 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1113 /* For decls that bind to the current definition, align_variable
1114 did also everything, except for not assuming ABI required alignment
1115 of TLS variables. For other vars, increase the alignment here
1116 as an optimization. */
1117 if (!decl_binds_to_current_def_p (decl
))
1119 /* On some machines, it is good to increase alignment sometimes. */
1120 #ifdef DATA_ALIGNMENT
1121 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1122 /* Don't increase alignment too much for TLS variables - TLS space
1124 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1127 if (DECL_INITIAL (decl
) != 0
1128 /* In LTO we have no errors in program; error_mark_node is used
1129 to mark offlined constructors. */
1130 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1132 unsigned int const_align
1133 = targetm
.constant_alignment (DECL_INITIAL (decl
), align
);
1134 /* Don't increase alignment too much for TLS variables - TLS space
1136 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1137 align
= const_align
;
1144 /* Return the section into which the given VAR_DECL or CONST_DECL
1145 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1146 section should be used wherever possible. */
1149 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1151 addr_space_t as
= ADDR_SPACE_GENERIC
;
1153 varpool_node
*vnode
= varpool_node::get (decl
);
1156 vnode
= vnode
->ultimate_alias_target ();
1160 if (TREE_TYPE (decl
) != error_mark_node
)
1161 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1163 /* We need the constructor to figure out reloc flag. */
1165 vnode
->get_constructor ();
1167 if (DECL_COMMON (decl
))
1169 /* If the decl has been given an explicit section name, or it resides
1170 in a non-generic address space, then it isn't common, and shouldn't
1171 be handled as such. */
1172 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1173 && ADDR_SPACE_GENERIC_P (as
));
1174 if (DECL_THREAD_LOCAL_P (decl
))
1175 return tls_comm_section
;
1176 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1177 return comm_section
;
1180 if (DECL_INITIAL (decl
) == error_mark_node
)
1181 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1182 else if (DECL_INITIAL (decl
))
1183 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1187 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1188 if (IN_NAMED_SECTION (decl
))
1190 section
*sect
= get_named_section (decl
, NULL
, reloc
);
1192 if ((sect
->common
.flags
& SECTION_BSS
)
1193 && !bss_initializer_p (decl
, true))
1195 error_at (DECL_SOURCE_LOCATION (decl
),
1196 "only zero initializers are allowed in section %qs",
1198 DECL_INITIAL (decl
) = error_mark_node
;
1203 if (ADDR_SPACE_GENERIC_P (as
)
1204 && !DECL_THREAD_LOCAL_P (decl
)
1205 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1206 && bss_initializer_p (decl
))
1208 if (!TREE_PUBLIC (decl
)
1209 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1210 && asan_protect_global (decl
)))
1211 return lcomm_section
;
1212 if (bss_noswitch_section
)
1213 return bss_noswitch_section
;
1216 return targetm
.asm_out
.select_section (decl
, reloc
,
1217 get_variable_align (decl
));
1220 /* Return the block into which object_block DECL should be placed. */
1222 static struct object_block
*
1223 get_block_for_decl (tree decl
)
1229 /* The object must be defined in this translation unit. */
1230 if (DECL_EXTERNAL (decl
))
1233 /* There's no point using object blocks for something that is
1234 isolated by definition. */
1235 if (DECL_COMDAT_GROUP (decl
))
1239 /* We can only calculate block offsets if the decl has a known
1241 if (DECL_SIZE_UNIT (decl
) == NULL
)
1243 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1246 /* Find out which section should contain DECL. We cannot put it into
1247 an object block if it requires a standalone definition. */
1249 align_variable (decl
, 0);
1250 sect
= get_variable_section (decl
, true);
1251 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1254 return get_block_for_section (sect
);
1257 /* Make sure block symbol SYMBOL is in block BLOCK. */
1260 change_symbol_block (rtx symbol
, struct object_block
*block
)
1262 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1264 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1265 SYMBOL_REF_BLOCK (symbol
) = block
;
1269 /* Return true if it is possible to put DECL in an object_block. */
1272 use_blocks_for_decl_p (tree decl
)
1274 struct symtab_node
*snode
;
1276 /* Only data DECLs can be placed into object blocks. */
1277 if (!VAR_P (decl
) && TREE_CODE (decl
) != CONST_DECL
)
1280 /* DECL_INITIAL (decl) set to decl is a hack used for some decls that
1281 are never used from code directly and we never want object block handling
1283 if (DECL_INITIAL (decl
) == decl
)
1286 /* If this decl is an alias, then we don't want to emit a
1289 && (snode
= symtab_node::get (decl
)) != NULL
1293 return targetm
.use_blocks_for_decl_p (decl
);
1296 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1297 until we find an identifier that is not itself a transparent alias.
1298 Modify the alias passed to it by reference (and all aliases on the
1299 way to the ultimate target), such that they do not have to be
1300 followed again, and return the ultimate target of the alias
1304 ultimate_transparent_alias_target (tree
*alias
)
1306 tree target
= *alias
;
1308 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1310 gcc_assert (TREE_CHAIN (target
));
1311 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1312 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1313 && ! TREE_CHAIN (target
));
1320 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1321 have static storage duration. In other words, it should not be an
1322 automatic variable, including PARM_DECLs.
1324 There is, however, one exception: this function handles variables
1325 explicitly placed in a particular register by the user.
1327 This is never called for PARM_DECL nodes. */
1330 make_decl_rtl (tree decl
)
1332 const char *name
= 0;
1337 /* Check that we are not being given an automatic variable. */
1338 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1339 && TREE_CODE (decl
) != RESULT_DECL
);
1341 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1342 gcc_assert (!VAR_P (decl
)
1343 || TREE_STATIC (decl
)
1344 || TREE_PUBLIC (decl
)
1345 || DECL_EXTERNAL (decl
)
1346 || DECL_REGISTER (decl
));
1348 /* And that we were not given a type or a label. */
1349 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1350 && TREE_CODE (decl
) != LABEL_DECL
);
1352 /* For a duplicate declaration, we can be called twice on the
1353 same DECL node. Don't discard the RTL already made. */
1354 if (DECL_RTL_SET_P (decl
))
1356 /* If the old RTL had the wrong mode, fix the mode. */
1357 x
= DECL_RTL (decl
);
1358 if (GET_MODE (x
) != DECL_MODE (decl
))
1359 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1361 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1364 /* ??? Another way to do this would be to maintain a hashed
1365 table of such critters. Instead of adding stuff to a DECL
1366 to give certain attributes to it, we could use an external
1367 hash map from DECL to set of attributes. */
1369 /* Let the target reassign the RTL if it wants.
1370 This is necessary, for example, when one machine specific
1371 decl attribute overrides another. */
1372 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1374 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1375 on the new decl information. */
1377 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1378 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1379 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1384 /* If this variable belongs to the global constant pool, retrieve the
1385 pre-computed RTL or recompute it in LTO mode. */
1386 if (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
1388 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1392 id
= DECL_ASSEMBLER_NAME (decl
);
1393 name
= IDENTIFIER_POINTER (id
);
1395 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1396 && DECL_REGISTER (decl
))
1398 error ("register name not specified for %q+D", decl
);
1400 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1402 const char *asmspec
= name
+1;
1403 machine_mode mode
= DECL_MODE (decl
);
1404 reg_number
= decode_reg_name (asmspec
);
1405 /* First detect errors in declaring global registers. */
1406 if (reg_number
== -1)
1407 error ("register name not specified for %q+D", decl
);
1408 else if (reg_number
< 0)
1409 error ("invalid register name for %q+D", decl
);
1410 else if (mode
== BLKmode
)
1411 error ("data type of %q+D isn%'t suitable for a register",
1413 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1414 error ("the register specified for %q+D cannot be accessed"
1415 " by the current target", decl
);
1416 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1417 error ("the register specified for %q+D is not general enough"
1418 " to be used as a register variable", decl
);
1419 else if (!targetm
.hard_regno_mode_ok (reg_number
, mode
))
1420 error ("register specified for %q+D isn%'t suitable for data type",
1422 /* Now handle properly declared static register variables. */
1427 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1429 DECL_INITIAL (decl
) = 0;
1430 error ("global register variable has initial value");
1432 if (TREE_THIS_VOLATILE (decl
))
1433 warning (OPT_Wvolatile_register_var
,
1434 "optimization may eliminate reads and/or "
1435 "writes to register variables");
1437 /* If the user specified one of the eliminables registers here,
1438 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1439 confused with that register and be eliminated. This usage is
1440 somewhat suspect... */
1442 SET_DECL_RTL (decl
, gen_raw_REG (mode
, reg_number
));
1443 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1444 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1446 if (TREE_STATIC (decl
))
1448 /* Make this register global, so not usable for anything
1450 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1451 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1452 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1454 nregs
= hard_regno_nregs (reg_number
, mode
);
1456 globalize_reg (decl
, reg_number
+ --nregs
);
1459 /* As a register variable, it has no section. */
1462 /* Avoid internal errors from invalid register
1464 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1465 DECL_HARD_REGISTER (decl
) = 0;
1466 /* Also avoid SSA inconsistencies by pretending this is an external
1468 DECL_EXTERNAL (decl
) = 1;
1471 /* Now handle ordinary static variables and functions (in memory).
1472 Also handle vars declared register invalidly. */
1473 else if (name
[0] == '*')
1475 #ifdef REGISTER_PREFIX
1476 if (strlen (REGISTER_PREFIX
) != 0)
1478 reg_number
= decode_reg_name (name
);
1479 if (reg_number
>= 0 || reg_number
== -3)
1480 error ("register name given for non-register variable %q+D", decl
);
1485 /* Specifying a section attribute on a variable forces it into a
1486 non-.bss section, and thus it cannot be common. */
1487 /* FIXME: In general this code should not be necessary because
1488 visibility pass is doing the same work. But notice_global_symbol
1489 is called early and it needs to make DECL_RTL to get the name.
1490 we take care of recomputing the DECL_RTL after visibility is changed. */
1492 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1493 && DECL_SECTION_NAME (decl
) != NULL
1494 && DECL_INITIAL (decl
) == NULL_TREE
1495 && DECL_COMMON (decl
))
1496 DECL_COMMON (decl
) = 0;
1498 /* Variables can't be both common and weak. */
1499 if (VAR_P (decl
) && DECL_WEAK (decl
))
1500 DECL_COMMON (decl
) = 0;
1502 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1503 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1506 machine_mode address_mode
= Pmode
;
1507 if (TREE_TYPE (decl
) != error_mark_node
)
1509 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1510 address_mode
= targetm
.addr_space
.address_mode (as
);
1512 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1514 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1515 SET_SYMBOL_REF_DECL (x
, decl
);
1517 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1518 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1519 set_mem_attributes (x
, decl
, 1);
1520 SET_DECL_RTL (decl
, x
);
1522 /* Optionally set flags or add text to the name to record information
1523 such as that it is a function name.
1524 If the name is changed, the macro ASM_OUTPUT_LABELREF
1525 will have to know how to strip this information. */
1526 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1529 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1530 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1534 make_decl_rtl_for_debug (tree decl
)
1536 unsigned int save_aliasing_flag
;
1539 if (DECL_RTL_SET_P (decl
))
1540 return DECL_RTL (decl
);
1542 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1543 call new_alias_set. If running with -fcompare-debug, sometimes
1544 we do not want to create alias sets that will throw the alias
1545 numbers off in the comparison dumps. So... clearing
1546 flag_strict_aliasing will keep new_alias_set() from creating a
1548 save_aliasing_flag
= flag_strict_aliasing
;
1549 flag_strict_aliasing
= 0;
1551 rtl
= DECL_RTL (decl
);
1552 /* Reset DECL_RTL back, as various parts of the compiler expects
1553 DECL_RTL set meaning it is actually going to be output. */
1554 SET_DECL_RTL (decl
, NULL
);
1556 flag_strict_aliasing
= save_aliasing_flag
;
1560 /* Output a string of literal assembler code
1561 for an `asm' keyword used between functions. */
1564 assemble_asm (tree string
)
1569 if (TREE_CODE (string
) == ADDR_EXPR
)
1570 string
= TREE_OPERAND (string
, 0);
1572 p
= TREE_STRING_POINTER (string
);
1573 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1576 /* Write the address of the entity given by SYMBOL to SEC. */
1578 assemble_addr_to_section (rtx symbol
, section
*sec
)
1580 switch_to_section (sec
);
1581 assemble_align (POINTER_SIZE
);
1582 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1585 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1586 not) section for PRIORITY. */
1588 get_cdtor_priority_section (int priority
, bool constructor_p
)
1590 /* Buffer conservatively large enough for the full range of a 32-bit
1591 int plus the text below. */
1594 /* ??? This only works reliably with the GNU linker. */
1595 sprintf (buf
, "%s.%.5u",
1596 constructor_p
? ".ctors" : ".dtors",
1597 /* Invert the numbering so the linker puts us in the proper
1598 order; constructors are run from right to left, and the
1599 linker sorts in increasing order. */
1600 MAX_INIT_PRIORITY
- priority
);
1601 return get_section (buf
, SECTION_WRITE
, NULL
);
1605 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1609 if (priority
!= DEFAULT_INIT_PRIORITY
)
1610 sec
= get_cdtor_priority_section (priority
,
1611 /*constructor_p=*/false);
1613 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1615 assemble_addr_to_section (symbol
, sec
);
1618 #ifdef DTORS_SECTION_ASM_OP
1620 default_dtor_section_asm_out_destructor (rtx symbol
,
1621 int priority ATTRIBUTE_UNUSED
)
1623 assemble_addr_to_section (symbol
, dtors_section
);
1628 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1632 if (priority
!= DEFAULT_INIT_PRIORITY
)
1633 sec
= get_cdtor_priority_section (priority
,
1634 /*constructor_p=*/true);
1636 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1638 assemble_addr_to_section (symbol
, sec
);
1641 #ifdef CTORS_SECTION_ASM_OP
1643 default_ctor_section_asm_out_constructor (rtx symbol
,
1644 int priority ATTRIBUTE_UNUSED
)
1646 assemble_addr_to_section (symbol
, ctors_section
);
1650 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1651 a nonzero value if the constant pool should be output before the
1652 start of the function, or a zero value if the pool should output
1653 after the end of the function. The default is to put it before the
1656 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1657 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1660 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1661 to be output to assembler.
1662 Set first_global_object_name and weak_global_object_name as appropriate. */
1665 notice_global_symbol (tree decl
)
1667 const char **t
= &first_global_object_name
;
1669 if (first_global_object_name
1670 || !TREE_PUBLIC (decl
)
1671 || DECL_EXTERNAL (decl
)
1672 || !DECL_NAME (decl
)
1673 || (VAR_P (decl
) && DECL_HARD_REGISTER (decl
))
1674 || (TREE_CODE (decl
) != FUNCTION_DECL
1676 || (DECL_COMMON (decl
)
1677 && (DECL_INITIAL (decl
) == 0
1678 || DECL_INITIAL (decl
) == error_mark_node
)))))
1681 /* We win when global object is found, but it is useful to know about weak
1682 symbol as well so we can produce nicer unique names. */
1683 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1684 t
= &weak_global_object_name
;
1688 tree id
= DECL_ASSEMBLER_NAME (decl
);
1689 ultimate_transparent_alias_target (&id
);
1690 *t
= ggc_strdup (targetm
.strip_name_encoding (IDENTIFIER_POINTER (id
)));
1694 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1695 current function goes into the cold section, so that targets can use
1696 current_function_section during RTL expansion. DECL describes the
1700 decide_function_section (tree decl
)
1702 first_function_block_is_cold
= false;
1704 if (DECL_SECTION_NAME (decl
))
1706 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1707 /* Calls to function_section rely on first_function_block_is_cold
1709 first_function_block_is_cold
= (node
1711 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1714 in_cold_section_p
= first_function_block_is_cold
;
1717 /* Get the function's name, as described by its RTL. This may be
1718 different from the DECL_NAME name used in the source file. */
1720 get_fnname_from_decl (tree decl
)
1722 rtx x
= DECL_RTL (decl
);
1723 gcc_assert (MEM_P (x
));
1725 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1729 /* Output assembler code for the constant pool of a function and associated
1730 with defining the name of the function. DECL describes the function.
1731 NAME is the function's name. For the constant pool, we use the current
1732 constant pool data. */
1735 assemble_start_function (tree decl
, const char *fnname
)
1738 char tmp_label
[100];
1739 bool hot_label_written
= false;
1741 if (crtl
->has_bb_partition
)
1743 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1744 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1745 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1746 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1747 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1748 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1749 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1750 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1752 cold_function_name
= NULL_TREE
;
1756 crtl
->subsections
.hot_section_label
= NULL
;
1757 crtl
->subsections
.cold_section_label
= NULL
;
1758 crtl
->subsections
.hot_section_end_label
= NULL
;
1759 crtl
->subsections
.cold_section_end_label
= NULL
;
1762 /* The following code does not need preprocessing in the assembler. */
1766 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1767 output_constant_pool (fnname
, decl
);
1769 align
= symtab_node::get (decl
)->definition_alignment ();
1771 /* Make sure the not and cold text (code) sections are properly
1772 aligned. This is necessary here in the case where the function
1773 has both hot and cold sections, because we don't want to re-set
1774 the alignment when the section switch happens mid-function. */
1776 if (crtl
->has_bb_partition
)
1778 first_function_block_is_cold
= false;
1780 switch_to_section (unlikely_text_section ());
1781 assemble_align (align
);
1782 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1784 /* When the function starts with a cold section, we need to explicitly
1785 align the hot section and write out the hot section label.
1786 But if the current function is a thunk, we do not have a CFG. */
1788 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1790 switch_to_section (text_section
);
1791 assemble_align (align
);
1792 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1793 hot_label_written
= true;
1794 first_function_block_is_cold
= true;
1796 in_cold_section_p
= first_function_block_is_cold
;
1800 /* Switch to the correct text section for the start of the function. */
1802 switch_to_section (function_section (decl
));
1803 if (crtl
->has_bb_partition
&& !hot_label_written
)
1804 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1806 /* Tell assembler to move to target machine's alignment for functions. */
1807 align
= floor_log2 (align
/ BITS_PER_UNIT
);
1810 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1813 /* Handle a user-specified function alignment.
1814 Note that we still need to align to DECL_ALIGN, as above,
1815 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1816 if (! DECL_USER_ALIGN (decl
)
1817 && align_functions
.levels
[0].log
> align
1818 && optimize_function_for_speed_p (cfun
))
1820 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1821 int align_log
= align_functions
.levels
[0].log
;
1823 int max_skip
= align_functions
.levels
[0].maxskip
;
1824 if (flag_limit_function_alignment
&& crtl
->max_insn_address
> 0
1825 && max_skip
>= crtl
->max_insn_address
)
1826 max_skip
= crtl
->max_insn_address
- 1;
1828 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1829 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
, align_log
, max_skip
);
1830 if (max_skip
== align_functions
.levels
[0].maxskip
)
1831 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1832 align_functions
.levels
[1].log
,
1833 align_functions
.levels
[1].maxskip
);
1835 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions
.levels
[0].log
);
1839 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1840 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1843 if (!DECL_IGNORED_P (decl
))
1844 (*debug_hooks
->begin_function
) (decl
);
1846 /* Make function name accessible from other files, if appropriate. */
1848 if (TREE_PUBLIC (decl
))
1850 notice_global_symbol (decl
);
1852 globalize_decl (decl
);
1854 maybe_assemble_visibility (decl
);
1857 if (DECL_PRESERVE_P (decl
))
1858 targetm
.asm_out
.mark_decl_preserved (fnname
);
1860 unsigned short patch_area_size
= crtl
->patch_area_size
;
1861 unsigned short patch_area_entry
= crtl
->patch_area_entry
;
1863 /* Emit the patching area before the entry label, if any. */
1864 if (patch_area_entry
> 0)
1865 targetm
.asm_out
.print_patchable_function_entry (asm_out_file
,
1866 patch_area_entry
, true);
1868 /* Do any machine/system dependent processing of the function name. */
1869 #ifdef ASM_DECLARE_FUNCTION_NAME
1870 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1872 /* Standard thing is just output label for the function. */
1873 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1874 #endif /* ASM_DECLARE_FUNCTION_NAME */
1876 /* And the area after the label. Record it if we haven't done so yet. */
1877 if (patch_area_size
> patch_area_entry
)
1878 targetm
.asm_out
.print_patchable_function_entry (asm_out_file
,
1881 patch_area_entry
== 0);
1883 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1884 saw_no_split_stack
= true;
1887 /* Output assembler code associated with defining the size of the
1888 function. DECL describes the function. NAME is the function's name. */
1891 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1893 #ifdef ASM_DECLARE_FUNCTION_SIZE
1894 /* We could have switched section in the middle of the function. */
1895 if (crtl
->has_bb_partition
)
1896 switch_to_section (function_section (decl
));
1897 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1899 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1901 output_constant_pool (fnname
, decl
);
1902 switch_to_section (function_section (decl
)); /* need to switch back */
1904 /* Output labels for end of hot/cold text sections (to be used by
1906 if (crtl
->has_bb_partition
)
1908 section
*save_text_section
;
1910 save_text_section
= in_section
;
1911 switch_to_section (unlikely_text_section ());
1912 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
1913 if (cold_function_name
!= NULL_TREE
)
1914 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file
,
1915 IDENTIFIER_POINTER (cold_function_name
),
1918 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1919 if (first_function_block_is_cold
)
1920 switch_to_section (text_section
);
1922 switch_to_section (function_section (decl
));
1923 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1924 switch_to_section (save_text_section
);
1928 /* Assemble code to leave SIZE bytes of zeros. */
1931 assemble_zeros (unsigned HOST_WIDE_INT size
)
1933 /* Do no output if -fsyntax-only. */
1934 if (flag_syntax_only
)
1937 #ifdef ASM_NO_SKIP_IN_TEXT
1938 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1939 so we must output 0s explicitly in the text section. */
1940 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1942 unsigned HOST_WIDE_INT i
;
1943 for (i
= 0; i
< size
; i
++)
1944 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1949 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1952 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1955 assemble_align (unsigned int align
)
1957 if (align
> BITS_PER_UNIT
)
1959 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1963 /* Assemble a string constant with the specified C string as contents. */
1966 assemble_string (const char *p
, int size
)
1971 /* If the string is very long, split it up. */
1975 int thissize
= size
- pos
;
1976 if (thissize
> maximum
)
1979 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1987 /* A noswitch_section_callback for lcomm_section. */
1990 emit_local (tree decl ATTRIBUTE_UNUSED
,
1991 const char *name ATTRIBUTE_UNUSED
,
1992 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1993 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1995 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1996 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
1997 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
2000 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
2001 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
2002 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
2005 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2010 /* A noswitch_section_callback for bss_noswitch_section. */
2012 #if defined ASM_OUTPUT_ALIGNED_BSS
2014 emit_bss (tree decl ATTRIBUTE_UNUSED
,
2015 const char *name ATTRIBUTE_UNUSED
,
2016 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2017 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2019 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
2020 get_variable_align (decl
));
2025 /* A noswitch_section_callback for comm_section. */
2028 emit_common (tree decl ATTRIBUTE_UNUSED
,
2029 const char *name ATTRIBUTE_UNUSED
,
2030 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2031 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2033 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
2034 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
2035 size
, get_variable_align (decl
));
2037 #elif defined ASM_OUTPUT_ALIGNED_COMMON
2038 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
2039 get_variable_align (decl
));
2042 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
2047 /* A noswitch_section_callback for tls_comm_section. */
2050 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
2051 const char *name ATTRIBUTE_UNUSED
,
2052 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2053 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2055 #ifdef ASM_OUTPUT_TLS_COMMON
2056 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2059 sorry ("thread-local COMMON data not implemented");
2064 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2065 NAME is the name of DECL's SYMBOL_REF. */
2068 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2071 unsigned HOST_WIDE_INT size
, rounded
;
2073 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2076 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2077 size
+= asan_red_zone_size (size
);
2079 /* Don't allocate zero bytes of common,
2080 since that means "undefined external" in the linker. */
2084 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2085 so that each uninitialized object starts on such a boundary. */
2086 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2087 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2088 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2090 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2091 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2092 error ("requested alignment for %q+D is greater than "
2093 "implemented alignment of %wu", decl
, rounded
);
2096 /* A subroutine of assemble_variable. Output the label and contents of
2097 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2098 is as for assemble_variable. */
2101 assemble_variable_contents (tree decl
, const char *name
,
2102 bool dont_output_data
, bool merge_strings
)
2104 /* Do any machine/system dependent processing of the object. */
2105 #ifdef ASM_DECLARE_OBJECT_NAME
2106 last_assemble_variable_decl
= decl
;
2107 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2109 /* Standard thing is just output label for the object. */
2110 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2111 #endif /* ASM_DECLARE_OBJECT_NAME */
2113 if (!dont_output_data
)
2115 /* Caller is supposed to use varpool_get_constructor when it wants
2116 to output the body. */
2117 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2118 if (DECL_INITIAL (decl
)
2119 && DECL_INITIAL (decl
) != error_mark_node
2120 && !initializer_zerop (DECL_INITIAL (decl
)))
2121 /* Output the actual data. */
2122 output_constant (DECL_INITIAL (decl
),
2123 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2124 get_variable_align (decl
),
2125 false, merge_strings
);
2127 /* Leave space for it. */
2128 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2129 targetm
.asm_out
.decl_end ();
2133 /* Write out assembly for the variable DECL, which is not defined in
2134 the current translation unit. */
2136 assemble_undefined_decl (tree decl
)
2138 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2139 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2142 /* Assemble everything that is needed for a variable or function declaration.
2143 Not used for automatic variables, and not used for function definitions.
2144 Should not be called for variables of incomplete structure type.
2146 TOP_LEVEL is nonzero if this variable has file scope.
2147 AT_END is nonzero if this is the special handling, at end of compilation,
2148 to define things that have had only tentative definitions.
2149 DONT_OUTPUT_DATA if nonzero means don't actually output the
2150 initial value (that will be done by the caller). */
2153 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2154 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2157 rtx decl_rtl
, symbol
;
2160 bool asan_protected
= false;
2162 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2163 gcc_assert (VAR_P (decl
));
2165 /* Emulated TLS had better not get this far. */
2166 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2168 last_assemble_variable_decl
= 0;
2170 /* Normally no need to say anything here for external references,
2171 since assemble_external is called by the language-specific code
2172 when a declaration is first seen. */
2174 if (DECL_EXTERNAL (decl
))
2177 /* Do nothing for global register variables. */
2178 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2180 TREE_ASM_WRITTEN (decl
) = 1;
2184 /* If type was incomplete when the variable was declared,
2185 see if it is complete now. */
2187 if (DECL_SIZE (decl
) == 0)
2188 layout_decl (decl
, 0);
2190 /* Still incomplete => don't allocate it; treat the tentative defn
2191 (which is what it must have been) as an `extern' reference. */
2193 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2195 error ("storage size of %q+D isn%'t known", decl
);
2196 TREE_ASM_WRITTEN (decl
) = 1;
2200 /* The first declaration of a variable that comes through this function
2201 decides whether it is global (in C, has external linkage)
2202 or local (in C, has internal linkage). So do nothing more
2203 if this function has already run. */
2205 if (TREE_ASM_WRITTEN (decl
))
2208 /* Make sure targetm.encode_section_info is invoked before we set
2210 decl_rtl
= DECL_RTL (decl
);
2212 TREE_ASM_WRITTEN (decl
) = 1;
2214 /* Do no output if -fsyntax-only. */
2215 if (flag_syntax_only
)
2218 if (! dont_output_data
2219 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2221 error ("size of variable %q+D is too large", decl
);
2225 gcc_assert (MEM_P (decl_rtl
));
2226 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2227 symbol
= XEXP (decl_rtl
, 0);
2229 /* If this symbol belongs to the tree constant pool, output the constant
2230 if it hasn't already been written. */
2231 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2233 tree decl
= SYMBOL_REF_DECL (symbol
);
2234 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2235 output_constant_def_contents (symbol
);
2241 name
= XSTR (symbol
, 0);
2242 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2243 notice_global_symbol (decl
);
2245 /* Compute the alignment of this data. */
2247 align_variable (decl
, dont_output_data
);
2249 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2250 && asan_protect_global (decl
))
2252 asan_protected
= true;
2253 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
2254 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
2257 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2259 align
= get_variable_align (decl
);
2261 if (TREE_PUBLIC (decl
))
2262 maybe_assemble_visibility (decl
);
2264 if (DECL_PRESERVE_P (decl
))
2265 targetm
.asm_out
.mark_decl_preserved (name
);
2267 /* First make the assembler name(s) global if appropriate. */
2268 sect
= get_variable_section (decl
, false);
2269 if (TREE_PUBLIC (decl
)
2270 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2271 globalize_decl (decl
);
2273 /* Output any data that we will need to use the address of. */
2274 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2275 output_addressed_constants (DECL_INITIAL (decl
), 0);
2277 /* dbxout.c needs to know this. */
2278 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2279 DECL_IN_TEXT_SECTION (decl
) = 1;
2281 /* If the decl is part of an object_block, make sure that the decl
2282 has been positioned within its block, but do not write out its
2283 definition yet. output_object_blocks will do that later. */
2284 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2286 gcc_assert (!dont_output_data
);
2287 place_block_symbol (symbol
);
2289 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2290 assemble_noswitch_variable (decl
, name
, sect
, align
);
2293 /* Special-case handling of vtv comdat sections. */
2294 if (sect
->named
.name
2295 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2296 handle_vtv_comdat_section (sect
, decl
);
2298 switch_to_section (sect
);
2299 if (align
> BITS_PER_UNIT
)
2300 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2301 assemble_variable_contents (decl
, name
, dont_output_data
,
2302 (sect
->common
.flags
& SECTION_MERGE
)
2303 && (sect
->common
.flags
& SECTION_STRINGS
));
2306 unsigned HOST_WIDE_INT
int size
2307 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2308 assemble_zeros (asan_red_zone_size (size
));
2314 /* Given a function declaration (FN_DECL), this function assembles the
2315 function into the .preinit_array section. */
2318 assemble_vtv_preinit_initializer (tree fn_decl
)
2321 unsigned flags
= SECTION_WRITE
;
2322 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2324 flags
|= SECTION_NOTYPE
;
2325 sect
= get_section (".preinit_array", flags
, fn_decl
);
2326 switch_to_section (sect
);
2327 assemble_addr_to_section (symbol
, sect
);
2330 /* Return 1 if type TYPE contains any pointers. */
2333 contains_pointers_p (tree type
)
2335 switch (TREE_CODE (type
))
2338 case REFERENCE_TYPE
:
2339 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2340 so I'll play safe and return 1. */
2346 case QUAL_UNION_TYPE
:
2349 /* For a type that has fields, see if the fields have pointers. */
2350 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2351 if (TREE_CODE (fields
) == FIELD_DECL
2352 && contains_pointers_p (TREE_TYPE (fields
)))
2358 /* An array type contains pointers if its element type does. */
2359 return contains_pointers_p (TREE_TYPE (type
));
2366 /* We delay assemble_external processing until
2367 the compilation unit is finalized. This is the best we can do for
2368 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2369 it all the way to final. See PR 17982 for further discussion. */
2370 static GTY(()) tree pending_assemble_externals
;
2372 #ifdef ASM_OUTPUT_EXTERNAL
2373 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2374 As a result, assemble_external can be called after the list of externals
2375 is processed and the pointer set destroyed. */
2376 static bool pending_assemble_externals_processed
;
2378 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2379 TREE_LIST in assemble_external. */
2380 static hash_set
<tree
> *pending_assemble_externals_set
;
2382 /* True if DECL is a function decl for which no out-of-line copy exists.
2383 It is assumed that DECL's assembler name has been set. */
2386 incorporeal_function_p (tree decl
)
2388 if (TREE_CODE (decl
) == FUNCTION_DECL
&& fndecl_built_in_p (decl
))
2392 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2393 && ALLOCA_FUNCTION_CODE_P (DECL_FUNCTION_CODE (decl
)))
2396 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2397 /* Atomic or sync builtins which have survived this far will be
2398 resolved externally and therefore are not incorporeal. */
2399 if (strncmp (name
, "__builtin_", 10) == 0)
2405 /* Actually do the tests to determine if this is necessary, and invoke
2406 ASM_OUTPUT_EXTERNAL. */
2408 assemble_external_real (tree decl
)
2410 rtx rtl
= DECL_RTL (decl
);
2412 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2413 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2414 && !incorporeal_function_p (decl
))
2416 /* Some systems do require some output. */
2417 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2418 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2424 process_pending_assemble_externals (void)
2426 #ifdef ASM_OUTPUT_EXTERNAL
2428 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2429 assemble_external_real (TREE_VALUE (list
));
2431 pending_assemble_externals
= 0;
2432 pending_assemble_externals_processed
= true;
2433 delete pending_assemble_externals_set
;
2437 /* This TREE_LIST contains any weak symbol declarations waiting
2439 static GTY(()) tree weak_decls
;
2441 /* Output something to declare an external symbol to the assembler,
2442 and qualifiers such as weakness. (Most assemblers don't need
2443 extern declaration, so we normally output nothing.) Do nothing if
2444 DECL is not external. */
2447 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2449 /* Make sure that the ASM_OUT_FILE is open.
2450 If it's not, we should not be calling this function. */
2451 gcc_assert (asm_out_file
);
2453 /* In a perfect world, the following condition would be true.
2454 Sadly, the Go front end emit assembly *from the front end*,
2455 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2457 /* This function should only be called if we are expanding, or have
2459 Ideally, only final.c would be calling this function, but it is
2460 not clear whether that would break things somehow. See PR 17982
2461 for further discussion. */
2462 gcc_assert (state
== EXPANSION
2463 || state
== FINISHED
);
2466 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2469 /* We want to output annotation for weak and external symbols at
2470 very last to check if they are references or not. */
2472 if (TARGET_SUPPORTS_WEAK
2474 /* TREE_STATIC is a weird and abused creature which is not
2475 generally the right test for whether an entity has been
2476 locally emitted, inlined or otherwise not-really-extern, but
2477 for declarations that can be weak, it happens to be
2479 && !TREE_STATIC (decl
)
2480 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2481 && value_member (decl
, weak_decls
) == NULL_TREE
)
2482 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2484 #ifdef ASM_OUTPUT_EXTERNAL
2485 if (pending_assemble_externals_processed
)
2487 assemble_external_real (decl
);
2491 if (! pending_assemble_externals_set
->add (decl
))
2492 pending_assemble_externals
= tree_cons (NULL
, decl
,
2493 pending_assemble_externals
);
2497 /* Similar, for calling a library function FUN. */
2500 assemble_external_libcall (rtx fun
)
2502 /* Declare library function name external when first used, if nec. */
2503 if (! SYMBOL_REF_USED (fun
))
2505 SYMBOL_REF_USED (fun
) = 1;
2506 targetm
.asm_out
.external_libcall (fun
);
2510 /* Assemble a label named NAME. */
2513 assemble_label (FILE *file
, const char *name
)
2515 ASM_OUTPUT_LABEL (file
, name
);
2518 /* Set the symbol_referenced flag for ID. */
2520 mark_referenced (tree id
)
2522 TREE_SYMBOL_REFERENCED (id
) = 1;
2525 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2527 mark_decl_referenced (tree decl
)
2529 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2531 /* Extern inline functions don't become needed when referenced.
2532 If we know a method will be emitted in other TU and no new
2533 functions can be marked reachable, just use the external
2535 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2536 if (!DECL_EXTERNAL (decl
)
2537 && !node
->definition
)
2538 node
->mark_force_output ();
2540 else if (VAR_P (decl
))
2542 varpool_node
*node
= varpool_node::get_create (decl
);
2543 /* C++ frontend use mark_decl_references to force COMDAT variables
2544 to be output that might appear dead otherwise. */
2545 node
->force_output
= true;
2547 /* else do nothing - we can get various sorts of CST nodes here,
2548 which do not need to be marked. */
2552 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2553 starts with a *, the rest of NAME is output verbatim. Otherwise
2554 NAME is transformed in a target-specific way (usually by the
2555 addition of an underscore). */
2558 assemble_name_raw (FILE *file
, const char *name
)
2561 fputs (&name
[1], file
);
2563 ASM_OUTPUT_LABELREF (file
, name
);
2566 /* Return NAME that should actually be emitted, looking through
2567 transparent aliases. If NAME refers to an entity that is also
2568 represented as a tree (like a function or variable), mark the entity
2571 assemble_name_resolve (const char *name
)
2573 const char *real_name
= targetm
.strip_name_encoding (name
);
2574 tree id
= maybe_get_identifier (real_name
);
2580 mark_referenced (id
);
2581 ultimate_transparent_alias_target (&id
);
2583 name
= IDENTIFIER_POINTER (id
);
2584 gcc_assert (! TREE_CHAIN (id
));
2590 /* Like assemble_name_raw, but should be used when NAME might refer to
2591 an entity that is also represented as a tree (like a function or
2592 variable). If NAME does refer to such an entity, that entity will
2593 be marked as referenced. */
2596 assemble_name (FILE *file
, const char *name
)
2598 assemble_name_raw (file
, assemble_name_resolve (name
));
2601 /* Allocate SIZE bytes writable static space with a gensym name
2602 and return an RTX to refer to its address. */
2605 assemble_static_space (unsigned HOST_WIDE_INT size
)
2608 const char *namestring
;
2611 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2613 namestring
= ggc_strdup (name
);
2615 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2616 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2618 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2619 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2622 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2623 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2626 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2627 so that each uninitialized object starts on such a boundary. */
2628 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2629 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2630 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2631 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2632 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2633 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2640 /* Assemble the static constant template for function entry trampolines.
2641 This is done at most once per compilation.
2642 Returns an RTX for the address of the template. */
2644 static GTY(()) rtx initial_trampoline
;
2647 assemble_trampoline_template (void)
2654 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2656 if (initial_trampoline
)
2657 return initial_trampoline
;
2659 /* By default, put trampoline templates in read-only data section. */
2661 #ifdef TRAMPOLINE_SECTION
2662 switch_to_section (TRAMPOLINE_SECTION
);
2664 switch_to_section (readonly_data_section
);
2667 /* Write the assembler code to define one. */
2668 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2670 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2672 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2673 targetm
.asm_out
.trampoline_template (asm_out_file
);
2675 /* Record the rtl to refer to it. */
2676 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2677 name
= ggc_strdup (label
);
2678 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2679 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2681 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2682 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2683 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2685 return initial_trampoline
;
2688 /* A and B are either alignments or offsets. Return the minimum alignment
2689 that may be assumed after adding the two together. */
2691 static inline unsigned
2692 min_align (unsigned int a
, unsigned int b
)
2694 return least_bit_hwi (a
| b
);
2697 /* Return the assembler directive for creating a given kind of integer
2698 object. SIZE is the number of bytes in the object and ALIGNED_P
2699 indicates whether it is known to be aligned. Return NULL if the
2700 assembly dialect has no such directive.
2702 The returned string should be printed at the start of a new line and
2703 be followed immediately by the object's initial value. */
2706 integer_asm_op (int size
, int aligned_p
)
2708 struct asm_int_op
*ops
;
2711 ops
= &targetm
.asm_out
.aligned_op
;
2713 ops
= &targetm
.asm_out
.unaligned_op
;
2718 return targetm
.asm_out
.byte_op
;
2746 /* Use directive OP to assemble an integer object X. Print OP at the
2747 start of the line, followed immediately by the value of X. */
2750 assemble_integer_with_op (const char *op
, rtx x
)
2752 fputs (op
, asm_out_file
);
2753 output_addr_const (asm_out_file
, x
);
2754 fputc ('\n', asm_out_file
);
2757 /* The default implementation of the asm_out.integer target hook. */
2760 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2761 unsigned int size ATTRIBUTE_UNUSED
,
2762 int aligned_p ATTRIBUTE_UNUSED
)
2764 const char *op
= integer_asm_op (size
, aligned_p
);
2765 /* Avoid GAS bugs for large values. Specifically negative values whose
2766 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2767 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2769 return op
&& (assemble_integer_with_op (op
, x
), true);
2772 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2773 the alignment of the integer in bits. Return 1 if we were able to output
2774 the constant, otherwise 0. We must be able to output the constant,
2775 if FORCE is nonzero. */
2778 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2782 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2784 /* See if the target hook can handle this kind of object. */
2785 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2788 /* If the object is a multi-byte one, try splitting it up. Split
2789 it into words it if is multi-word, otherwise split it into bytes. */
2792 machine_mode omode
, imode
;
2793 unsigned int subalign
;
2794 unsigned int subsize
, i
;
2795 enum mode_class mclass
;
2797 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2798 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2799 if (GET_CODE (x
) == CONST_FIXED
)
2800 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2804 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0).require ();
2805 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0).require ();
2807 for (i
= 0; i
< size
; i
+= subsize
)
2809 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2810 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2816 /* If we've printed some of it, but not all of it, there's no going
2821 gcc_assert (!force
);
2826 /* Assemble the floating-point constant D into an object of size MODE. ALIGN
2827 is the alignment of the constant in bits. If REVERSE is true, D is output
2828 in reverse storage order. */
2831 assemble_real (REAL_VALUE_TYPE d
, scalar_float_mode mode
, unsigned int align
,
2834 long data
[4] = {0, 0, 0, 0};
2835 int bitsize
, nelts
, nunits
, units_per
;
2838 /* This is hairy. We have a quantity of known size. real_to_target
2839 will put it into an array of *host* longs, 32 bits per element
2840 (even if long is more than 32 bits). We need to determine the
2841 number of array elements that are occupied (nelts) and the number
2842 of *target* min-addressable units that will be occupied in the
2843 object file (nunits). We cannot assume that 32 divides the
2844 mode's bitsize (size * BITS_PER_UNIT) evenly.
2846 size * BITS_PER_UNIT is used here to make sure that padding bits
2847 (which might appear at either end of the value; real_to_target
2848 will include the padding bits in its output array) are included. */
2850 nunits
= GET_MODE_SIZE (mode
);
2851 bitsize
= nunits
* BITS_PER_UNIT
;
2852 nelts
= CEIL (bitsize
, 32);
2853 units_per
= 32 / BITS_PER_UNIT
;
2855 real_to_target (data
, &d
, mode
);
2857 /* Put out the first word with the specified alignment. */
2858 unsigned int chunk_nunits
= MIN (nunits
, units_per
);
2860 elt
= flip_storage_order (SImode
, gen_int_mode (data
[nelts
- 1], SImode
));
2862 elt
= GEN_INT (sext_hwi (data
[0], chunk_nunits
* BITS_PER_UNIT
));
2863 assemble_integer (elt
, chunk_nunits
, align
, 1);
2864 nunits
-= chunk_nunits
;
2866 /* Subsequent words need only 32-bit alignment. */
2867 align
= min_align (align
, 32);
2869 for (int i
= 1; i
< nelts
; i
++)
2871 chunk_nunits
= MIN (nunits
, units_per
);
2873 elt
= flip_storage_order (SImode
,
2874 gen_int_mode (data
[nelts
- 1 - i
], SImode
));
2876 elt
= GEN_INT (sext_hwi (data
[i
], chunk_nunits
* BITS_PER_UNIT
));
2877 assemble_integer (elt
, chunk_nunits
, align
, 1);
2878 nunits
-= chunk_nunits
;
2882 /* Given an expression EXP with a constant value,
2883 reduce it to the sum of an assembler symbol and an integer.
2884 Store them both in the structure *VALUE.
2885 EXP must be reducible. */
2894 decode_addr_const (tree exp
, class addr_const
*value
)
2896 tree target
= TREE_OPERAND (exp
, 0);
2897 poly_int64 offset
= 0;
2903 if (TREE_CODE (target
) == COMPONENT_REF
2904 && poly_int_tree_p (byte_position (TREE_OPERAND (target
, 1)),
2908 target
= TREE_OPERAND (target
, 0);
2910 else if (TREE_CODE (target
) == ARRAY_REF
2911 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2913 /* Truncate big offset. */
2915 += (TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2916 * wi::to_poly_widest (TREE_OPERAND (target
, 1)).force_shwi ());
2917 target
= TREE_OPERAND (target
, 0);
2919 else if (TREE_CODE (target
) == MEM_REF
2920 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2922 offset
+= mem_ref_offset (target
).force_shwi ();
2923 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2925 else if (TREE_CODE (target
) == INDIRECT_REF
2926 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2927 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2929 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2934 switch (TREE_CODE (target
))
2938 x
= DECL_RTL (target
);
2942 x
= gen_rtx_MEM (FUNCTION_MODE
,
2943 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2952 x
= lookup_constant_def (target
);
2953 /* Should have been added by output_addressed_constants. */
2958 /* This deals with absolute addresses. */
2959 offset
+= tree_to_shwi (TREE_OPERAND (target
, 0));
2960 x
= gen_rtx_MEM (QImode
,
2961 gen_rtx_SYMBOL_REF (Pmode
, "origin of addresses"));
2964 case COMPOUND_LITERAL_EXPR
:
2965 gcc_assert (COMPOUND_LITERAL_EXPR_DECL (target
));
2966 x
= DECL_RTL (COMPOUND_LITERAL_EXPR_DECL (target
));
2973 gcc_assert (MEM_P (x
));
2977 value
->offset
= offset
;
2980 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2982 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2984 /* Constant pool accessor function. */
2986 hash_table
<tree_descriptor_hasher
> *
2987 constant_pool_htab (void)
2989 return const_desc_htab
;
2992 /* Compute a hash code for a constant expression. */
2995 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
3001 const_hash_1 (const tree exp
)
3006 enum tree_code code
= TREE_CODE (exp
);
3008 /* Either set P and LEN to the address and len of something to hash and
3009 exit the switch or return a value. */
3014 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
3015 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
3019 return real_hash (TREE_REAL_CST_PTR (exp
));
3022 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
3025 p
= TREE_STRING_POINTER (exp
);
3026 len
= TREE_STRING_LENGTH (exp
);
3030 return (const_hash_1 (TREE_REALPART (exp
)) * 5
3031 + const_hash_1 (TREE_IMAGPART (exp
)));
3035 hi
= 7 + VECTOR_CST_NPATTERNS (exp
);
3036 hi
= hi
* 563 + VECTOR_CST_NELTS_PER_PATTERN (exp
);
3037 unsigned int count
= vector_cst_encoded_nelts (exp
);
3038 for (unsigned int i
= 0; i
< count
; ++i
)
3039 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ENCODED_ELT (exp
, i
));
3045 unsigned HOST_WIDE_INT idx
;
3048 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
3050 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
3052 hi
= hi
* 603 + const_hash_1 (value
);
3058 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
3059 return const_hash_1 (TREE_OPERAND (exp
, 0));
3064 class addr_const value
;
3066 decode_addr_const (exp
, &value
);
3067 switch (GET_CODE (value
.base
))
3070 /* Don't hash the address of the SYMBOL_REF;
3071 only use the offset and the symbol name. */
3072 hi
= value
.offset
.coeffs
[0];
3073 p
= XSTR (value
.base
, 0);
3074 for (i
= 0; p
[i
] != 0; i
++)
3075 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3079 hi
= (value
.offset
.coeffs
[0]
3080 + CODE_LABEL_NUMBER (label_ref_label (value
.base
)) * 13);
3090 case POINTER_PLUS_EXPR
:
3092 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3093 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3096 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3099 /* A language specific constant. Just hash the code. */
3103 /* Compute hashing function. */
3105 for (i
= 0; i
< len
; i
++)
3106 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3111 /* Wrapper of compare_constant, for the htab interface. */
3113 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3114 constant_descriptor_tree
*c2
)
3116 if (c1
->hash
!= c2
->hash
)
3118 return compare_constant (c1
->value
, c2
->value
);
3121 /* Compare t1 and t2, and return 1 only if they are known to result in
3122 the same bit pattern on output. */
3125 compare_constant (const tree t1
, const tree t2
)
3127 enum tree_code typecode
;
3129 if (t1
== NULL_TREE
)
3130 return t2
== NULL_TREE
;
3131 if (t2
== NULL_TREE
)
3134 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3137 switch (TREE_CODE (t1
))
3140 /* Integer constants are the same only if the same width of type. */
3141 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3143 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3145 return tree_int_cst_equal (t1
, t2
);
3148 /* Real constants are the same only if the same width of type. In
3149 addition to the same width, we need to check whether the modes are the
3150 same. There might be two floating point modes that are the same size
3151 but have different representations, such as the PowerPC that has 2
3152 different 128-bit floating point types (IBM extended double and IEEE
3153 128-bit floating point). */
3154 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3156 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3158 return real_identical (&TREE_REAL_CST (t1
), &TREE_REAL_CST (t2
));
3161 /* Fixed constants are the same only if the same width of type. */
3162 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3165 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3168 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3169 || int_size_in_bytes (TREE_TYPE (t1
))
3170 != int_size_in_bytes (TREE_TYPE (t2
)))
3173 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3174 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3175 TREE_STRING_LENGTH (t1
)));
3178 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3179 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3183 if (VECTOR_CST_NPATTERNS (t1
)
3184 != VECTOR_CST_NPATTERNS (t2
))
3187 if (VECTOR_CST_NELTS_PER_PATTERN (t1
)
3188 != VECTOR_CST_NELTS_PER_PATTERN (t2
))
3191 unsigned int count
= vector_cst_encoded_nelts (t1
);
3192 for (unsigned int i
= 0; i
< count
; ++i
)
3193 if (!compare_constant (VECTOR_CST_ENCODED_ELT (t1
, i
),
3194 VECTOR_CST_ENCODED_ELT (t2
, i
)))
3202 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3203 unsigned HOST_WIDE_INT idx
;
3205 typecode
= TREE_CODE (TREE_TYPE (t1
));
3206 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3209 if (typecode
== ARRAY_TYPE
)
3211 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3212 /* For arrays, check that mode, size and storage order match. */
3213 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3215 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
))
3216 || TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t1
))
3217 != TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t2
)))
3222 /* For record and union constructors, require exact type
3224 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3228 v1
= CONSTRUCTOR_ELTS (t1
);
3229 v2
= CONSTRUCTOR_ELTS (t2
);
3230 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3233 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3235 constructor_elt
*c1
= &(*v1
)[idx
];
3236 constructor_elt
*c2
= &(*v2
)[idx
];
3238 /* Check that each value is the same... */
3239 if (!compare_constant (c1
->value
, c2
->value
))
3241 /* ... and that they apply to the same fields! */
3242 if (typecode
== ARRAY_TYPE
)
3244 if (!compare_constant (c1
->index
, c2
->index
))
3249 if (c1
->index
!= c2
->index
)
3260 class addr_const value1
, value2
;
3264 decode_addr_const (t1
, &value1
);
3265 decode_addr_const (t2
, &value2
);
3267 if (maybe_ne (value1
.offset
, value2
.offset
))
3270 code
= GET_CODE (value1
.base
);
3271 if (code
!= GET_CODE (value2
.base
))
3277 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3281 ret
= (CODE_LABEL_NUMBER (label_ref_label (value1
.base
))
3282 == CODE_LABEL_NUMBER (label_ref_label (value2
.base
)));
3292 case POINTER_PLUS_EXPR
:
3295 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3296 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3299 case VIEW_CONVERT_EXPR
:
3300 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3309 /* Return the section into which constant EXP should be placed. */
3312 get_constant_section (tree exp
, unsigned int align
)
3314 return targetm
.asm_out
.select_section (exp
,
3315 compute_reloc_for_constant (exp
),
3319 /* Return the size of constant EXP in bytes. */
3321 static HOST_WIDE_INT
3322 get_constant_size (tree exp
)
3326 size
= int_size_in_bytes (TREE_TYPE (exp
));
3327 gcc_checking_assert (size
>= 0);
3328 gcc_checking_assert (TREE_CODE (exp
) != STRING_CST
3329 || size
>= TREE_STRING_LENGTH (exp
));
3333 /* Subroutine of output_constant_def:
3334 No constant equal to EXP is known to have been output.
3335 Make a constant descriptor to enter EXP in the hash table.
3336 Assign the label number and construct RTL to refer to the
3337 constant's location in memory.
3338 Caller is responsible for updating the hash table. */
3340 static struct constant_descriptor_tree
*
3341 build_constant_desc (tree exp
)
3343 struct constant_descriptor_tree
*desc
;
3349 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3352 /* Create a string containing the label name, in LABEL. */
3353 labelno
= const_labelno
++;
3354 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3356 /* Construct the VAR_DECL associated with the constant. */
3357 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3359 DECL_ARTIFICIAL (decl
) = 1;
3360 DECL_IGNORED_P (decl
) = 1;
3361 TREE_READONLY (decl
) = 1;
3362 TREE_STATIC (decl
) = 1;
3363 TREE_ADDRESSABLE (decl
) = 1;
3364 /* We don't set the RTL yet as this would cause varpool to assume that the
3365 variable is referenced. Moreover, it would just be dropped in LTO mode.
3366 Instead we set the flag that will be recognized in make_decl_rtl. */
3367 DECL_IN_CONSTANT_POOL (decl
) = 1;
3368 DECL_INITIAL (decl
) = desc
->value
;
3369 /* ??? targetm.constant_alignment hasn't been updated for vector types on
3370 most architectures so use DATA_ALIGNMENT as well, except for strings. */
3371 if (TREE_CODE (exp
) == STRING_CST
)
3372 SET_DECL_ALIGN (decl
, targetm
.constant_alignment (exp
, DECL_ALIGN (decl
)));
3375 align_variable (decl
, 0);
3376 if (DECL_ALIGN (decl
) < GET_MODE_ALIGNMENT (DECL_MODE (decl
))
3377 && ((optab_handler (movmisalign_optab
, DECL_MODE (decl
))
3378 != CODE_FOR_nothing
)
3379 || targetm
.slow_unaligned_access (DECL_MODE (decl
),
3380 DECL_ALIGN (decl
))))
3381 SET_DECL_ALIGN (decl
, GET_MODE_ALIGNMENT (DECL_MODE (decl
)));
3384 /* Now construct the SYMBOL_REF and the MEM. */
3385 if (use_object_blocks_p ())
3387 int align
= (TREE_CODE (decl
) == CONST_DECL
3388 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3390 : symtab_node::get (decl
)->definition_alignment ());
3391 section
*sect
= get_constant_section (exp
, align
);
3392 symbol
= create_block_symbol (ggc_strdup (label
),
3393 get_block_for_section (sect
), -1);
3396 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3397 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3398 SET_SYMBOL_REF_DECL (symbol
, decl
);
3399 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3401 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3402 set_mem_alias_set (rtl
, 0);
3404 /* Putting EXP into the literal pool might have imposed a different
3405 alignment which should be visible in the RTX as well. */
3406 set_mem_align (rtl
, DECL_ALIGN (decl
));
3408 /* We cannot share RTX'es in pool entries.
3409 Mark this piece of RTL as required for unsharing. */
3410 RTX_FLAG (rtl
, used
) = 1;
3412 /* Set flags or add text to the name to record information, such as
3413 that it is a local symbol. If the name is changed, the macro
3414 ASM_OUTPUT_LABELREF will have to know how to strip this
3415 information. This call might invalidate our local variable
3416 SYMBOL; we can't use it afterward. */
3417 targetm
.encode_section_info (exp
, rtl
, true);
3424 /* Subroutine of output_constant_def and tree_output_constant_def:
3425 Add a constant to the hash table that tracks which constants
3426 already have labels. */
3428 static constant_descriptor_tree
*
3429 add_constant_to_table (tree exp
, int defer
)
3431 /* The hash table methods may call output_constant_def for addressed
3432 constants, so handle them first. */
3433 output_addressed_constants (exp
, defer
);
3435 /* Sanity check to catch recursive insertion. */
3436 static bool inserting
;
3437 gcc_assert (!inserting
);
3440 /* Look up EXP in the table of constant descriptors. If we didn't
3441 find it, create a new one. */
3442 struct constant_descriptor_tree key
;
3444 key
.hash
= const_hash_1 (exp
);
3445 constant_descriptor_tree
**loc
3446 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3450 struct constant_descriptor_tree
*desc
= *loc
;
3453 desc
= build_constant_desc (exp
);
3454 desc
->hash
= key
.hash
;
3461 /* Return an rtx representing a reference to constant data in memory
3462 for the constant expression EXP.
3464 If assembler code for such a constant has already been output,
3465 return an rtx to refer to it.
3466 Otherwise, output such a constant in memory
3467 and generate an rtx for it.
3469 If DEFER is nonzero, this constant can be deferred and output only
3470 if referenced in the function after all optimizations.
3472 `const_desc_table' records which constants already have label strings. */
3475 output_constant_def (tree exp
, int defer
)
3477 struct constant_descriptor_tree
*desc
= add_constant_to_table (exp
, defer
);
3478 maybe_output_constant_def_contents (desc
, defer
);
3482 /* Subroutine of output_constant_def: Decide whether or not we need to
3483 output the constant DESC now, and if so, do it. */
3485 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3488 rtx symbol
= XEXP (desc
->rtl
, 0);
3489 tree exp
= desc
->value
;
3491 if (flag_syntax_only
)
3494 if (TREE_ASM_WRITTEN (exp
))
3495 /* Already output; don't do it again. */
3498 /* We can always defer constants as long as the context allows
3502 /* Increment n_deferred_constants if it exists. It needs to be at
3503 least as large as the number of constants actually referred to
3504 by the function. If it's too small we'll stop looking too early
3505 and fail to emit constants; if it's too large we'll only look
3506 through the entire function when we could have stopped earlier. */
3508 n_deferred_constants
++;
3512 output_constant_def_contents (symbol
);
3515 /* Subroutine of output_constant_def_contents. Output the definition
3516 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3517 constant's alignment in bits. */
3520 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
,
3525 size
= get_constant_size (exp
);
3527 /* Do any machine/system dependent processing of the constant. */
3528 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3530 /* Output the value of EXP. */
3531 output_constant (exp
, size
, align
, false, merge_strings
);
3533 targetm
.asm_out
.decl_end ();
3536 /* We must output the constant data referred to by SYMBOL; do so. */
3539 output_constant_def_contents (rtx symbol
)
3541 tree decl
= SYMBOL_REF_DECL (symbol
);
3542 tree exp
= DECL_INITIAL (decl
);
3543 bool asan_protected
= false;
3545 /* Make sure any other constants whose addresses appear in EXP
3546 are assigned label numbers. */
3547 output_addressed_constants (exp
, 0);
3549 /* We are no longer deferring this constant. */
3550 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3552 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3553 && TREE_CODE (exp
) == STRING_CST
3554 && asan_protect_global (exp
))
3556 asan_protected
= true;
3557 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
3558 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
3561 /* If the constant is part of an object block, make sure that the
3562 decl has been positioned within its block, but do not write out
3563 its definition yet. output_object_blocks will do that later. */
3564 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3565 place_block_symbol (symbol
);
3568 int align
= (TREE_CODE (decl
) == CONST_DECL
3569 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3571 : symtab_node::get (decl
)->definition_alignment ());
3572 section
*sect
= get_constant_section (exp
, align
);
3573 switch_to_section (sect
);
3574 if (align
> BITS_PER_UNIT
)
3575 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3576 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
,
3577 (sect
->common
.flags
& SECTION_MERGE
)
3578 && (sect
->common
.flags
& SECTION_STRINGS
));
3581 HOST_WIDE_INT size
= get_constant_size (exp
);
3582 assemble_zeros (asan_red_zone_size (size
));
3587 /* Look up EXP in the table of constant descriptors. Return the rtl
3588 if it has been emitted, else null. */
3591 lookup_constant_def (tree exp
)
3593 struct constant_descriptor_tree key
;
3596 key
.hash
= const_hash_1 (exp
);
3597 constant_descriptor_tree
*desc
3598 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3600 return (desc
? desc
->rtl
: NULL_RTX
);
3603 /* Return a tree representing a reference to constant data in memory
3604 for the constant expression EXP.
3606 This is the counterpart of output_constant_def at the Tree level. */
3609 tree_output_constant_def (tree exp
)
3611 struct constant_descriptor_tree
*desc
= add_constant_to_table (exp
, 1);
3612 tree decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3613 varpool_node::finalize_decl (decl
);
3617 class GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3619 class constant_descriptor_rtx
*next
;
3623 HOST_WIDE_INT offset
;
3625 fixed_size_mode mode
;
3631 struct const_rtx_desc_hasher
: ggc_ptr_hash
<constant_descriptor_rtx
>
3633 static hashval_t
hash (constant_descriptor_rtx
*);
3634 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3637 /* Used in the hash tables to avoid outputting the same constant
3638 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3639 are output once per function, not once per file. */
3640 /* ??? Only a few targets need per-function constant pools. Most
3641 can use one per-file pool. Should add a targetm bit to tell the
3644 struct GTY(()) rtx_constant_pool
{
3645 /* Pointers to first and last constant in pool, as ordered by offset. */
3646 class constant_descriptor_rtx
*first
;
3647 class constant_descriptor_rtx
*last
;
3649 /* Hash facility for making memory-constants from constant rtl-expressions.
3650 It is used on RISC machines where immediate integer arguments and
3651 constant addresses are restricted so that such constants must be stored
3653 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3655 /* Current offset in constant pool (does not include any
3656 machine-specific header). */
3657 HOST_WIDE_INT offset
;
3660 /* Hash and compare functions for const_rtx_htab. */
3663 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3669 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3670 constant_descriptor_rtx
*y
)
3672 if (x
->mode
!= y
->mode
)
3674 return rtx_equal_p (x
->constant
, y
->constant
);
3677 /* Hash one component of a constant. */
3680 const_rtx_hash_1 (const_rtx x
)
3682 unsigned HOST_WIDE_INT hwi
;
3688 code
= GET_CODE (x
);
3689 mode
= GET_MODE (x
);
3690 h
= (hashval_t
) code
* 1048573 + mode
;
3699 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3700 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3702 h
^= (hashval_t
) hwi
;
3703 for (i
= 1; i
< n
; ++i
)
3706 h
^= (hashval_t
) hwi
;
3711 case CONST_WIDE_INT
:
3714 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3715 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3720 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3722 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3726 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3730 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3734 h
^= htab_hash_string (XSTR (x
, 0));
3738 h
= h
* 251 + CODE_LABEL_NUMBER (label_ref_label (x
));
3742 case UNSPEC_VOLATILE
:
3743 h
= h
* 251 + XINT (x
, 1);
3753 /* Compute a hash value for X, which should be a constant. */
3756 const_rtx_hash (rtx x
)
3759 subrtx_iterator::array_type array
;
3760 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3761 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3766 /* Create and return a new rtx constant pool. */
3768 static struct rtx_constant_pool
*
3769 create_constant_pool (void)
3771 struct rtx_constant_pool
*pool
;
3773 pool
= ggc_alloc
<rtx_constant_pool
> ();
3774 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3781 /* Initialize constant pool hashing for a new function. */
3784 init_varasm_status (void)
3786 crtl
->varasm
.pool
= create_constant_pool ();
3787 crtl
->varasm
.deferred_constants
= 0;
3790 /* Given a MINUS expression, simplify it if both sides
3791 include the same symbol. */
3794 simplify_subtraction (rtx x
)
3796 rtx r
= simplify_rtx (x
);
3800 /* Given a constant rtx X, make (or find) a memory constant for its value
3801 and return a MEM rtx to refer to it in memory. IN_MODE is the mode
3805 force_const_mem (machine_mode in_mode
, rtx x
)
3807 class constant_descriptor_rtx
*desc
, tmp
;
3808 struct rtx_constant_pool
*pool
;
3813 constant_descriptor_rtx
**slot
;
3814 fixed_size_mode mode
;
3816 /* We can't force variable-sized objects to memory. */
3817 if (!is_a
<fixed_size_mode
> (in_mode
, &mode
))
3820 /* If we're not allowed to drop X into the constant pool, don't. */
3821 if (targetm
.cannot_force_const_mem (mode
, x
))
3824 /* Record that this function has used a constant pool entry. */
3825 crtl
->uses_const_pool
= 1;
3827 /* Decide which pool to use. */
3828 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3829 ? shared_constant_pool
3830 : crtl
->varasm
.pool
);
3832 /* Lookup the value in the hashtable. */
3835 hash
= const_rtx_hash (x
);
3836 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3839 /* If the constant was already present, return its memory. */
3841 return copy_rtx (desc
->mem
);
3843 /* Otherwise, create a new descriptor. */
3844 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3847 /* Align the location counter as required by EXP's data type. */
3848 machine_mode align_mode
= (mode
== VOIDmode
? word_mode
: mode
);
3849 align
= targetm
.static_rtx_alignment (align_mode
);
3851 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3852 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3855 desc
->constant
= copy_rtx (tmp
.constant
);
3856 desc
->offset
= pool
->offset
;
3859 desc
->align
= align
;
3860 desc
->labelno
= const_labelno
;
3863 pool
->offset
+= GET_MODE_SIZE (mode
);
3865 pool
->last
->next
= desc
;
3867 pool
->first
= pool
->last
= desc
;
3870 /* Create a string containing the label name, in LABEL. */
3871 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3874 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3875 the constants pool. */
3876 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3878 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3879 symbol
= create_block_symbol (ggc_strdup (label
),
3880 get_block_for_section (sect
), -1);
3883 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3885 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3886 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3887 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3889 /* Construct the MEM. */
3890 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3891 set_mem_align (def
, align
);
3893 /* If we're dropping a label to the constant pool, make sure we
3895 if (GET_CODE (x
) == LABEL_REF
)
3896 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3898 return copy_rtx (def
);
3901 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3904 get_pool_constant (const_rtx addr
)
3906 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3909 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3910 and whether it has been output or not. */
3913 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3915 class constant_descriptor_rtx
*desc
;
3917 desc
= SYMBOL_REF_CONSTANT (addr
);
3918 *pmarked
= (desc
->mark
!= 0);
3919 return desc
->constant
;
3922 /* Similar, return the mode. */
3925 get_pool_mode (const_rtx addr
)
3927 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3930 /* Return TRUE if and only if the constant pool has no entries. Note
3931 that even entries we might end up choosing not to emit are counted
3932 here, so there is the potential for missed optimizations. */
3935 constant_pool_empty_p (void)
3937 return crtl
->varasm
.pool
->first
== NULL
;
3940 /* Worker function for output_constant_pool_1. Emit assembly for X
3941 in MODE with known alignment ALIGN. */
3944 output_constant_pool_2 (fixed_size_mode mode
, rtx x
, unsigned int align
)
3946 switch (GET_MODE_CLASS (mode
))
3949 case MODE_DECIMAL_FLOAT
:
3951 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3952 assemble_real (*CONST_DOUBLE_REAL_VALUE (x
),
3953 as_a
<scalar_float_mode
> (mode
), align
, false);
3958 case MODE_PARTIAL_INT
:
3963 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3966 case MODE_VECTOR_BOOL
:
3968 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3970 /* Pick the smallest integer mode that contains at least one
3971 whole element. Often this is byte_mode and contains more
3972 than one element. */
3973 unsigned int nelts
= GET_MODE_NUNITS (mode
);
3974 unsigned int elt_bits
= GET_MODE_BITSIZE (mode
) / nelts
;
3975 unsigned int int_bits
= MAX (elt_bits
, BITS_PER_UNIT
);
3976 scalar_int_mode int_mode
= int_mode_for_size (int_bits
, 0).require ();
3978 /* Build the constant up one integer at a time. */
3979 unsigned int elts_per_int
= int_bits
/ elt_bits
;
3980 for (unsigned int i
= 0; i
< nelts
; i
+= elts_per_int
)
3982 unsigned HOST_WIDE_INT value
= 0;
3983 unsigned int limit
= MIN (nelts
- i
, elts_per_int
);
3984 for (unsigned int j
= 0; j
< limit
; ++j
)
3985 if (INTVAL (CONST_VECTOR_ELT (x
, i
+ j
)) != 0)
3986 value
|= 1 << (j
* elt_bits
);
3987 output_constant_pool_2 (int_mode
, gen_int_mode (value
, int_mode
),
3988 i
!= 0 ? MIN (align
, int_bits
) : align
);
3992 case MODE_VECTOR_FLOAT
:
3993 case MODE_VECTOR_INT
:
3994 case MODE_VECTOR_FRACT
:
3995 case MODE_VECTOR_UFRACT
:
3996 case MODE_VECTOR_ACCUM
:
3997 case MODE_VECTOR_UACCUM
:
4000 scalar_mode submode
= GET_MODE_INNER (mode
);
4001 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
4003 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
4004 units
= GET_MODE_NUNITS (mode
);
4006 for (i
= 0; i
< units
; i
++)
4008 rtx elt
= CONST_VECTOR_ELT (x
, i
);
4009 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
4019 /* Worker function for output_constant_pool. Emit constant DESC,
4020 giving it ALIGN bits of alignment. */
4023 output_constant_pool_1 (class constant_descriptor_rtx
*desc
,
4030 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
4031 whose CODE_LABEL has been deleted. This can occur if a jump table
4032 is eliminated by optimization. If so, write a constant of zero
4033 instead. Note that this can also happen by turning the
4034 CODE_LABEL into a NOTE. */
4035 /* ??? This seems completely and utterly wrong. Certainly it's
4036 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
4037 functioning even with rtx_insn::deleted and friends. */
4040 switch (GET_CODE (tmp
))
4043 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
4044 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
4046 tmp
= XEXP (XEXP (tmp
, 0), 0);
4051 rtx_insn
*insn
= label_ref_label (tmp
);
4052 gcc_assert (!insn
->deleted ());
4053 gcc_assert (!NOTE_P (insn
)
4054 || NOTE_KIND (insn
) != NOTE_INSN_DELETED
);
4062 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
4063 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
4064 align
, desc
->labelno
, done
);
4067 assemble_align (align
);
4069 /* Output the label. */
4070 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
4073 Pass actual alignment value while emitting string constant to asm code
4074 as function 'output_constant_pool_1' explicitly passes the alignment as 1
4075 assuming that the data is already aligned which prevents the generation
4076 of fix-up table entries. */
4077 output_constant_pool_2 (desc
->mode
, x
, desc
->align
);
4079 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
4080 sections have proper size. */
4081 if (align
> GET_MODE_BITSIZE (desc
->mode
)
4083 && (in_section
->common
.flags
& SECTION_MERGE
))
4084 assemble_align (align
);
4086 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
4092 /* Recompute the offsets of entries in POOL, and the overall size of
4093 POOL. Do this after calling mark_constant_pool to ensure that we
4094 are computing the offset values for the pool which we will actually
4098 recompute_pool_offsets (struct rtx_constant_pool
*pool
)
4100 class constant_descriptor_rtx
*desc
;
4103 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4106 /* Recalculate offset. */
4107 unsigned int align
= desc
->align
;
4108 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
4109 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
4110 desc
->offset
= pool
->offset
;
4111 pool
->offset
+= GET_MODE_SIZE (desc
->mode
);
4115 /* Mark all constants that are referenced by SYMBOL_REFs in X.
4116 Emit referenced deferred strings. */
4119 mark_constants_in_pattern (rtx insn
)
4121 subrtx_iterator::array_type array
;
4122 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
4124 const_rtx x
= *iter
;
4125 if (GET_CODE (x
) == SYMBOL_REF
)
4127 if (CONSTANT_POOL_ADDRESS_P (x
))
4129 class constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
4130 if (desc
->mark
== 0)
4133 iter
.substitute (desc
->constant
);
4136 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
4138 tree decl
= SYMBOL_REF_DECL (x
);
4139 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
4141 n_deferred_constants
--;
4142 output_constant_def_contents (CONST_CAST_RTX (x
));
4149 /* Look through appropriate parts of INSN, marking all entries in the
4150 constant pool which are actually being used. Entries that are only
4151 referenced by other constants are also marked as used. Emit
4152 deferred strings that are used. */
4155 mark_constants (rtx_insn
*insn
)
4160 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4161 insns, not any notes that may be attached. We don't want to mark
4162 a constant just because it happens to appear in a REG_EQUIV note. */
4163 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4165 int i
, n
= seq
->len ();
4166 for (i
= 0; i
< n
; ++i
)
4168 rtx subinsn
= seq
->element (i
);
4169 if (INSN_P (subinsn
))
4170 mark_constants_in_pattern (subinsn
);
4174 mark_constants_in_pattern (insn
);
4177 /* Look through the instructions for this function, and mark all the
4178 entries in POOL which are actually being used. Emit deferred constants
4179 which have indeed been used. */
4182 mark_constant_pool (void)
4186 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4189 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4190 mark_constants (insn
);
4193 /* Write all the constants in POOL. */
4196 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4198 class constant_descriptor_rtx
*desc
;
4200 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4203 /* If the constant is part of an object_block, make sure that
4204 the constant has been positioned within its block, but do not
4205 write out its definition yet. output_object_blocks will do
4207 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4208 && SYMBOL_REF_BLOCK (desc
->sym
))
4209 place_block_symbol (desc
->sym
);
4212 switch_to_section (targetm
.asm_out
.select_rtx_section
4213 (desc
->mode
, desc
->constant
, desc
->align
));
4214 output_constant_pool_1 (desc
, desc
->align
);
4219 /* Mark all constants that are used in the current function, then write
4220 out the function's private constant pool. */
4223 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4224 tree fndecl ATTRIBUTE_UNUSED
)
4226 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4228 /* It is possible for gcc to call force_const_mem and then to later
4229 discard the instructions which refer to the constant. In such a
4230 case we do not need to output the constant. */
4231 mark_constant_pool ();
4233 /* Having marked the constant pool entries we'll actually emit, we
4234 now need to rebuild the offset information, which may have become
4236 recompute_pool_offsets (pool
);
4238 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4239 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4242 output_constant_pool_contents (pool
);
4244 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4245 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4249 /* Write the contents of the shared constant pool. */
4252 output_shared_constant_pool (void)
4254 output_constant_pool_contents (shared_constant_pool
);
4257 /* Determine what kind of relocations EXP may need. */
4260 compute_reloc_for_constant (tree exp
)
4262 int reloc
= 0, reloc2
;
4265 switch (TREE_CODE (exp
))
4269 /* Go inside any operations that get_inner_reference can handle and see
4270 if what's inside is a constant: no need to do anything here for
4271 addresses of variables or functions. */
4272 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4273 tem
= TREE_OPERAND (tem
, 0))
4276 if (TREE_CODE (tem
) == MEM_REF
4277 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4279 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4283 if (!targetm
.binds_local_p (tem
))
4290 case POINTER_PLUS_EXPR
:
4291 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4292 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4296 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4297 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4298 /* The difference of two local labels is computable at link time. */
4299 if (reloc
== 1 && reloc2
== 1)
4306 case VIEW_CONVERT_EXPR
:
4307 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4312 unsigned HOST_WIDE_INT idx
;
4313 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4315 reloc
|= compute_reloc_for_constant (tem
);
4325 /* Find all the constants whose addresses are referenced inside of EXP,
4326 and make sure assembler code with a label has been output for each one.
4327 Indicate whether an ADDR_EXPR has been encountered. */
4330 output_addressed_constants (tree exp
, int defer
)
4334 switch (TREE_CODE (exp
))
4338 /* Go inside any operations that get_inner_reference can handle and see
4339 if what's inside is a constant: no need to do anything here for
4340 addresses of variables or functions. */
4341 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4342 tem
= TREE_OPERAND (tem
, 0))
4345 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4346 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4347 tem
= DECL_INITIAL (tem
);
4349 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4350 output_constant_def (tem
, defer
);
4352 if (TREE_CODE (tem
) == MEM_REF
)
4353 output_addressed_constants (TREE_OPERAND (tem
, 0), defer
);
4357 case POINTER_PLUS_EXPR
:
4359 output_addressed_constants (TREE_OPERAND (exp
, 1), defer
);
4363 case VIEW_CONVERT_EXPR
:
4364 output_addressed_constants (TREE_OPERAND (exp
, 0), defer
);
4369 unsigned HOST_WIDE_INT idx
;
4370 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4372 output_addressed_constants (tem
, defer
);
4381 /* Whether a constructor CTOR is a valid static constant initializer if all
4382 its elements are. This used to be internal to initializer_constant_valid_p
4383 and has been exposed to let other functions like categorize_ctor_elements
4384 evaluate the property while walking a constructor for other purposes. */
4387 constructor_static_from_elts_p (const_tree ctor
)
4389 return (TREE_CONSTANT (ctor
)
4390 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4391 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4392 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4395 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4398 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4399 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4400 which are valid when ENDTYPE is an integer of any size; in
4401 particular, this does not accept a pointer minus a constant. This
4402 returns null_pointer_node if the VALUE is an absolute constant
4403 which can be used to initialize a static variable. Otherwise it
4407 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4411 if (!INTEGRAL_TYPE_P (endtype
))
4414 op0
= TREE_OPERAND (value
, 0);
4415 op1
= TREE_OPERAND (value
, 1);
4417 /* Like STRIP_NOPS except allow the operand mode to widen. This
4418 works around a feature of fold that simplifies (int)(p1 - p2) to
4419 ((int)p1 - (int)p2) under the theory that the narrower operation
4422 while (CONVERT_EXPR_P (op0
)
4423 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4425 tree inner
= TREE_OPERAND (op0
, 0);
4426 if (inner
== error_mark_node
4427 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4428 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op0
)))
4429 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4434 while (CONVERT_EXPR_P (op1
)
4435 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4437 tree inner
= TREE_OPERAND (op1
, 0);
4438 if (inner
== error_mark_node
4439 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4440 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op1
)))
4441 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4446 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4450 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4451 cache
? cache
+ 2 : NULL
);
4452 /* Both initializers must be known. */
4456 && (op0
== null_pointer_node
4457 || TREE_CODE (value
) == MINUS_EXPR
))
4458 return null_pointer_node
;
4460 /* Support differences between labels. */
4461 if (TREE_CODE (op0
) == LABEL_DECL
4462 && TREE_CODE (op1
) == LABEL_DECL
)
4463 return null_pointer_node
;
4465 if (TREE_CODE (op0
) == STRING_CST
4466 && TREE_CODE (op1
) == STRING_CST
4467 && operand_equal_p (op0
, op1
, 1))
4468 return null_pointer_node
;
4474 /* Helper function of initializer_constant_valid_p.
4475 Return nonzero if VALUE is a valid constant-valued expression
4476 for use in initializing a static variable; one that can be an
4477 element of a "constant" initializer.
4479 Return null_pointer_node if the value is absolute;
4480 if it is relocatable, return the variable that determines the relocation.
4481 We assume that VALUE has been folded as much as possible;
4482 therefore, we do not need to check for such things as
4483 arithmetic-combinations of integers.
4485 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4488 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4492 switch (TREE_CODE (value
))
4495 if (constructor_static_from_elts_p (value
))
4497 unsigned HOST_WIDE_INT idx
;
4499 bool absolute
= true;
4501 if (cache
&& cache
[0] == value
)
4503 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4506 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4509 /* An absolute value is required with reverse SSO. */
4510 || (reloc
!= null_pointer_node
4511 && TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (value
))
4512 && !AGGREGATE_TYPE_P (TREE_TYPE (elt
))))
4517 cache
[1] = NULL_TREE
;
4521 if (reloc
!= null_pointer_node
)
4524 /* For a non-absolute relocation, there is no single
4525 variable that can be "the variable that determines the
4530 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4532 return absolute
? null_pointer_node
: error_mark_node
;
4535 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4543 return null_pointer_node
;
4548 tree op0
= staticp (TREE_OPERAND (value
, 0));
4551 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4552 to be a constant, this is old-skool offsetof-like nonsense. */
4553 if (TREE_CODE (op0
) == INDIRECT_REF
4554 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4555 return null_pointer_node
;
4556 /* Taking the address of a nested function involves a trampoline,
4557 unless we don't need or want one. */
4558 if (TREE_CODE (op0
) == FUNCTION_DECL
4559 && DECL_STATIC_CHAIN (op0
)
4560 && !TREE_NO_TRAMPOLINE (value
))
4562 /* "&{...}" requires a temporary to hold the constructed
4564 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4570 case NON_LVALUE_EXPR
:
4571 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4574 case VIEW_CONVERT_EXPR
:
4576 tree src
= TREE_OPERAND (value
, 0);
4577 tree src_type
= TREE_TYPE (src
);
4578 tree dest_type
= TREE_TYPE (value
);
4580 /* Allow view-conversions from aggregate to non-aggregate type only
4581 if the bit pattern is fully preserved afterwards; otherwise, the
4582 RTL expander won't be able to apply a subsequent transformation
4583 to the underlying constructor. */
4584 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4586 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4587 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4592 /* Allow all other kinds of view-conversion. */
4593 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4598 tree src
= TREE_OPERAND (value
, 0);
4599 tree src_type
= TREE_TYPE (src
);
4600 tree dest_type
= TREE_TYPE (value
);
4602 /* Allow conversions between pointer types, floating-point
4603 types, and offset types. */
4604 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4605 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4606 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4607 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4608 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4610 /* Allow length-preserving conversions between integer types. */
4611 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4612 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4613 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4615 /* Allow conversions between other integer types only if
4616 explicit value. Don't allow sign-extension to a type larger
4617 than word and pointer, there aren't relocations that would
4618 allow to sign extend it to a wider type. */
4619 if (INTEGRAL_TYPE_P (dest_type
)
4620 && INTEGRAL_TYPE_P (src_type
)
4621 && (TYPE_UNSIGNED (src_type
)
4622 || TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
)
4623 || TYPE_PRECISION (dest_type
) <= BITS_PER_WORD
4624 || TYPE_PRECISION (dest_type
) <= POINTER_SIZE
))
4626 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4627 if (inner
== null_pointer_node
)
4628 return null_pointer_node
;
4632 /* Allow (int) &foo provided int is as wide as a pointer. */
4633 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4634 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4635 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4637 /* Likewise conversions from int to pointers, but also allow
4638 conversions from 0. */
4639 if ((POINTER_TYPE_P (dest_type
)
4640 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4641 && INTEGRAL_TYPE_P (src_type
))
4643 if (TREE_CODE (src
) == INTEGER_CST
4644 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4645 return null_pointer_node
;
4646 if (integer_zerop (src
))
4647 return null_pointer_node
;
4648 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4649 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4652 /* Allow conversions to struct or union types if the value
4654 if (TREE_CODE (dest_type
) == RECORD_TYPE
4655 || TREE_CODE (dest_type
) == UNION_TYPE
)
4656 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4660 case POINTER_PLUS_EXPR
:
4662 /* Any valid floating-point constants will have been folded by now;
4663 with -frounding-math we hit this with addition of two constants. */
4664 if (TREE_CODE (endtype
) == REAL_TYPE
)
4666 if (cache
&& cache
[0] == value
)
4668 if (! INTEGRAL_TYPE_P (endtype
)
4669 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4671 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4673 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4676 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4677 endtype
, ncache
+ 2);
4678 /* If either term is absolute, use the other term's relocation. */
4679 if (valid0
== null_pointer_node
)
4681 else if (valid1
== null_pointer_node
)
4683 /* Support narrowing pointer differences. */
4685 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4689 /* Support narrowing pointer differences. */
4690 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4698 case POINTER_DIFF_EXPR
:
4700 if (TREE_CODE (endtype
) == REAL_TYPE
)
4702 if (cache
&& cache
[0] == value
)
4704 if (! INTEGRAL_TYPE_P (endtype
)
4705 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4707 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4709 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4712 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4713 endtype
, ncache
+ 2);
4714 /* Win if second argument is absolute. */
4715 if (valid1
== null_pointer_node
)
4717 /* Win if both arguments have the same relocation.
4718 Then the value is absolute. */
4719 else if (valid0
== valid1
&& valid0
!= 0)
4720 ret
= null_pointer_node
;
4721 /* Since GCC guarantees that string constants are unique in the
4722 generated code, a subtraction between two copies of the same
4723 constant string is absolute. */
4724 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4725 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4726 && operand_equal_p (valid0
, valid1
, 1))
4727 ret
= null_pointer_node
;
4728 /* Support narrowing differences. */
4730 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4734 /* Support narrowing differences. */
4735 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4750 /* Return nonzero if VALUE is a valid constant-valued expression
4751 for use in initializing a static variable; one that can be an
4752 element of a "constant" initializer.
4754 Return null_pointer_node if the value is absolute;
4755 if it is relocatable, return the variable that determines the relocation.
4756 We assume that VALUE has been folded as much as possible;
4757 therefore, we do not need to check for such things as
4758 arithmetic-combinations of integers. */
4760 initializer_constant_valid_p (tree value
, tree endtype
, bool reverse
)
4762 tree reloc
= initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4764 /* An absolute value is required with reverse storage order. */
4766 && reloc
!= null_pointer_node
4768 && !AGGREGATE_TYPE_P (endtype
)
4769 && !VECTOR_TYPE_P (endtype
))
4775 /* Return true if VALUE is a valid constant-valued expression
4776 for use in initializing a static bit-field; one that can be
4777 an element of a "constant" initializer. */
4780 initializer_constant_valid_for_bitfield_p (tree value
)
4782 /* For bitfields we support integer constants or possibly nested aggregates
4784 switch (TREE_CODE (value
))
4788 unsigned HOST_WIDE_INT idx
;
4791 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4792 if (!initializer_constant_valid_for_bitfield_p (elt
))
4801 case VIEW_CONVERT_EXPR
:
4802 case NON_LVALUE_EXPR
:
4804 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4813 /* Check if a STRING_CST fits into the field.
4814 Tolerate only the case when the NUL termination
4815 does not fit into the field. */
4818 check_string_literal (tree string
, unsigned HOST_WIDE_INT size
)
4820 tree type
= TREE_TYPE (string
);
4821 tree eltype
= TREE_TYPE (type
);
4822 unsigned HOST_WIDE_INT elts
= tree_to_uhwi (TYPE_SIZE_UNIT (eltype
));
4823 unsigned HOST_WIDE_INT mem_size
= tree_to_uhwi (TYPE_SIZE_UNIT (type
));
4824 int len
= TREE_STRING_LENGTH (string
);
4826 if (elts
!= 1 && elts
!= 2 && elts
!= 4)
4828 if (len
< 0 || len
% elts
!= 0)
4830 if (size
< (unsigned)len
)
4832 if (mem_size
!= size
)
4837 /* output_constructor outer state of relevance in recursive calls, typically
4838 for nested aggregate bitfields. */
4840 struct oc_outer_state
{
4841 unsigned int bit_offset
; /* current position in ... */
4842 int byte
; /* ... the outer byte buffer. */
4845 static unsigned HOST_WIDE_INT
4846 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int, bool,
4849 /* Output assembler code for constant EXP, with no label.
4850 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4851 Assumes output_addressed_constants has been done on EXP already.
4853 Generate at least SIZE bytes of assembler data, padding at the end
4854 with zeros if necessary. SIZE must always be specified. The returned
4855 value is the actual number of bytes of assembler data generated, which
4856 may be bigger than SIZE if the object contains a variable length field.
4858 SIZE is important for structure constructors,
4859 since trailing members may have been omitted from the constructor.
4860 It is also important for initialization of arrays from string constants
4861 since the full length of the string constant might not be wanted.
4862 It is also needed for initialization of unions, where the initializer's
4863 type is just one member, and that may not be as long as the union.
4865 There a case in which we would fail to output exactly SIZE bytes:
4866 for a structure constructor that wants to produce more than SIZE bytes.
4867 But such constructors will never be generated for any possible input.
4869 ALIGN is the alignment of the data in bits.
4871 If REVERSE is true, EXP is output in reverse storage order. */
4873 static unsigned HOST_WIDE_INT
4874 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
4875 bool reverse
, bool merge_strings
)
4877 enum tree_code code
;
4878 unsigned HOST_WIDE_INT thissize
;
4881 if (size
== 0 || flag_syntax_only
)
4884 /* See if we're trying to initialize a pointer in a non-default mode
4885 to the address of some declaration somewhere. If the target says
4886 the mode is valid for pointers, assume the target has a way of
4888 if (TREE_CODE (exp
) == NOP_EXPR
4889 && POINTER_TYPE_P (TREE_TYPE (exp
))
4890 && targetm
.addr_space
.valid_pointer_mode
4891 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
4892 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4894 tree saved_type
= TREE_TYPE (exp
);
4896 /* Peel off any intermediate conversions-to-pointer for valid
4898 while (TREE_CODE (exp
) == NOP_EXPR
4899 && POINTER_TYPE_P (TREE_TYPE (exp
))
4900 && targetm
.addr_space
.valid_pointer_mode
4901 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
4902 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4903 exp
= TREE_OPERAND (exp
, 0);
4905 /* If what we're left with is the address of something, we can
4906 convert the address to the final type and output it that
4908 if (TREE_CODE (exp
) == ADDR_EXPR
)
4909 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4910 /* Likewise for constant ints. */
4911 else if (TREE_CODE (exp
) == INTEGER_CST
)
4912 exp
= fold_convert (saved_type
, exp
);
4916 /* Eliminate any conversions since we'll be outputting the underlying
4918 while (CONVERT_EXPR_P (exp
)
4919 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4920 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4922 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4923 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4925 /* Make sure eliminating the conversion is really a no-op, except with
4926 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4927 union types to allow for Ada unchecked unions. */
4928 if (type_size
> op_size
4929 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4930 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4931 /* Keep the conversion. */
4934 exp
= TREE_OPERAND (exp
, 0);
4937 code
= TREE_CODE (TREE_TYPE (exp
));
4938 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4940 /* Allow a constructor with no elements for any data type.
4941 This means to fill the space with zeros. */
4942 if (TREE_CODE (exp
) == CONSTRUCTOR
4943 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4945 assemble_zeros (size
);
4949 if (TREE_CODE (exp
) == FDESC_EXPR
)
4951 #ifdef ASM_OUTPUT_FDESC
4952 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4953 tree decl
= TREE_OPERAND (exp
, 0);
4954 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4961 /* Now output the underlying data. If we've handling the padding, return.
4962 Otherwise, break and ensure SIZE is the size written. */
4969 case REFERENCE_TYPE
:
4971 case FIXED_POINT_TYPE
:
4973 cst
= expand_expr (exp
, NULL_RTX
, VOIDmode
, EXPAND_INITIALIZER
);
4975 cst
= flip_storage_order (TYPE_MODE (TREE_TYPE (exp
)), cst
);
4976 if (!assemble_integer (cst
, MIN (size
, thissize
), align
, 0))
4977 error ("initializer for integer/fixed-point value is too complicated");
4981 if (TREE_CODE (exp
) != REAL_CST
)
4982 error ("initializer for floating value is not a floating constant");
4984 assemble_real (TREE_REAL_CST (exp
),
4985 SCALAR_FLOAT_TYPE_MODE (TREE_TYPE (exp
)),
4990 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
,
4992 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4993 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)),
4999 switch (TREE_CODE (exp
))
5002 return output_constructor (exp
, size
, align
, reverse
, NULL
);
5004 thissize
= (unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
);
5007 || TREE_STRING_POINTER (exp
) [thissize
- 1] != '\0'))
5009 gcc_checking_assert (check_string_literal (exp
, size
));
5010 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
5014 scalar_mode inner
= SCALAR_TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
5015 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
5016 int elt_size
= GET_MODE_SIZE (inner
);
5017 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
,
5019 thissize
= elt_size
;
5020 /* Static constants must have a fixed size. */
5021 unsigned int nunits
= VECTOR_CST_NELTS (exp
).to_constant ();
5022 for (unsigned int i
= 1; i
< nunits
; i
++)
5024 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
,
5026 thissize
+= elt_size
;
5037 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
5038 return output_constructor (exp
, size
, align
, reverse
, NULL
);
5047 if (size
> thissize
)
5048 assemble_zeros (size
- thissize
);
5053 /* Subroutine of output_constructor, used for computing the size of
5054 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
5055 type with an unspecified upper bound. */
5057 static unsigned HOST_WIDE_INT
5058 array_size_for_constructor (tree val
)
5061 unsigned HOST_WIDE_INT cnt
;
5062 tree index
, value
, tmp
;
5065 /* This code used to attempt to handle string constants that are not
5066 arrays of single-bytes, but nothing else does, so there's no point in
5068 if (TREE_CODE (val
) == STRING_CST
)
5069 return TREE_STRING_LENGTH (val
);
5071 max_index
= NULL_TREE
;
5072 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
5074 if (TREE_CODE (index
) == RANGE_EXPR
)
5075 index
= TREE_OPERAND (index
, 1);
5076 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
5080 if (max_index
== NULL_TREE
)
5083 /* Compute the total number of array elements. */
5084 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
5085 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
5087 /* Multiply by the array element unit size to find number of bytes. */
5088 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
5090 gcc_assert (wi::fits_uhwi_p (i
));
5091 return i
.to_uhwi ();
5094 /* Other datastructures + helpers for output_constructor. */
5096 /* output_constructor local state to support interaction with helpers. */
5098 struct oc_local_state
{
5100 /* Received arguments. */
5101 tree exp
; /* Constructor expression. */
5102 tree type
; /* Type of constructor expression. */
5103 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
5104 unsigned int align
; /* Known initial alignment. */
5105 tree min_index
; /* Lower bound if specified for an array. */
5107 /* Output processing state. */
5108 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
5109 int byte
; /* Part of a bitfield byte yet to be output. */
5110 int last_relative_index
; /* Implicit or explicit index of the last
5111 array element output within a bitfield. */
5112 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
5113 bool reverse
; /* Whether reverse storage order is in use. */
5115 /* Current element. */
5116 tree field
; /* Current field decl in a record. */
5117 tree val
; /* Current element value. */
5118 tree index
; /* Current element index. */
5122 /* Helper for output_constructor. From the current LOCAL state, output a
5123 RANGE_EXPR element. */
5126 output_constructor_array_range (oc_local_state
*local
)
5128 /* Perform the index calculation in modulo arithmetic but
5129 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
5130 but we are using an unsigned sizetype. */
5131 unsigned prec
= TYPE_PRECISION (sizetype
);
5132 offset_int idx
= wi::sext (wi::to_offset (TREE_OPERAND (local
->index
, 0))
5133 - wi::to_offset (local
->min_index
), prec
);
5134 tree valtype
= TREE_TYPE (local
->val
);
5135 HOST_WIDE_INT fieldpos
5136 = (idx
* wi::to_offset (TYPE_SIZE_UNIT (valtype
))).to_short_addr ();
5138 /* Advance to offset of this element. */
5139 if (fieldpos
> local
->total_bytes
)
5141 assemble_zeros (fieldpos
- local
->total_bytes
);
5142 local
->total_bytes
= fieldpos
;
5145 /* Must not go backwards. */
5146 gcc_assert (fieldpos
== local
->total_bytes
);
5148 unsigned HOST_WIDE_INT fieldsize
5149 = int_size_in_bytes (TREE_TYPE (local
->type
));
5151 HOST_WIDE_INT lo_index
5152 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
5153 HOST_WIDE_INT hi_index
5154 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
5155 HOST_WIDE_INT index
;
5158 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
5160 for (index
= lo_index
; index
<= hi_index
; index
++)
5162 /* Output the element's initial value. */
5163 if (local
->val
== NULL_TREE
)
5164 assemble_zeros (fieldsize
);
5166 fieldsize
= output_constant (local
->val
, fieldsize
, align2
,
5167 local
->reverse
, false);
5169 /* Count its size. */
5170 local
->total_bytes
+= fieldsize
;
5174 /* Helper for output_constructor. From the current LOCAL state, output a
5175 field element that is not true bitfield or part of an outer one. */
5178 output_constructor_regular_field (oc_local_state
*local
)
5180 /* Field size and position. Since this structure is static, we know the
5181 positions are constant. */
5182 unsigned HOST_WIDE_INT fieldsize
;
5183 HOST_WIDE_INT fieldpos
;
5185 unsigned int align2
;
5187 /* Output any buffered-up bit-fields preceding this element. */
5188 if (local
->byte_buffer_in_use
)
5190 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5191 local
->total_bytes
++;
5192 local
->byte_buffer_in_use
= false;
5195 if (local
->index
!= NULL_TREE
)
5197 /* Perform the index calculation in modulo arithmetic but
5198 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
5199 but we are using an unsigned sizetype. */
5200 unsigned prec
= TYPE_PRECISION (sizetype
);
5201 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
5202 - wi::to_offset (local
->min_index
), prec
);
5203 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
5206 else if (local
->field
!= NULL_TREE
)
5207 fieldpos
= int_byte_position (local
->field
);
5211 /* Advance to offset of this element.
5212 Note no alignment needed in an array, since that is guaranteed
5213 if each element has the proper size. */
5214 if (local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
5216 if (fieldpos
> local
->total_bytes
)
5218 assemble_zeros (fieldpos
- local
->total_bytes
);
5219 local
->total_bytes
= fieldpos
;
5222 /* Must not go backwards. */
5223 gcc_assert (fieldpos
== local
->total_bytes
);
5226 /* Find the alignment of this element. */
5227 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
5229 /* Determine size this element should occupy. */
5234 /* If this is an array with an unspecified upper bound,
5235 the initializer determines the size. */
5236 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5237 but we cannot do this until the deprecated support for
5238 initializing zero-length array members is removed. */
5239 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
5240 && (!TYPE_DOMAIN (TREE_TYPE (local
->field
))
5241 || !TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
)))))
5243 fieldsize
= array_size_for_constructor (local
->val
);
5244 /* Given a non-empty initialization, this field had better
5245 be last. Given a flexible array member, the next field
5246 on the chain is a TYPE_DECL of the enclosing struct. */
5247 const_tree next
= DECL_CHAIN (local
->field
);
5248 gcc_assert (!fieldsize
|| !next
|| TREE_CODE (next
) != FIELD_DECL
);
5249 tree size
= TYPE_SIZE_UNIT (TREE_TYPE (local
->val
));
5250 gcc_checking_assert (compare_tree_int (size
, fieldsize
) == 0);
5253 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5256 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5258 /* Output the element's initial value. */
5259 if (local
->val
== NULL_TREE
)
5260 assemble_zeros (fieldsize
);
5262 fieldsize
= output_constant (local
->val
, fieldsize
, align2
,
5263 local
->reverse
, false);
5265 /* Count its size. */
5266 local
->total_bytes
+= fieldsize
;
5269 /* Helper for output_constructor. From the LOCAL state, output an element
5270 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5271 from the start of a possibly ongoing outer byte buffer. */
5274 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5276 /* Bit size of this element. */
5277 HOST_WIDE_INT ebitsize
5279 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5280 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5282 /* Relative index of this element if this is an array component. */
5283 HOST_WIDE_INT relative_index
5286 ? (tree_to_shwi (local
->index
)
5287 - tree_to_shwi (local
->min_index
))
5288 : local
->last_relative_index
+ 1)
5291 /* Bit position of this element from the start of the containing
5293 HOST_WIDE_INT constructor_relative_ebitpos
5295 ? int_bit_position (local
->field
)
5296 : ebitsize
* relative_index
);
5298 /* Bit position of this element from the start of a possibly ongoing
5299 outer byte buffer. */
5300 HOST_WIDE_INT byte_relative_ebitpos
5301 = bit_offset
+ constructor_relative_ebitpos
;
5303 /* From the start of a possibly ongoing outer byte buffer, offsets to
5304 the first bit of this element and to the first bit past the end of
5306 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5307 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5309 local
->last_relative_index
= relative_index
;
5311 if (local
->val
== NULL_TREE
)
5312 local
->val
= integer_zero_node
;
5314 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5315 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5316 local
->val
= TREE_OPERAND (local
->val
, 0);
5318 if (TREE_CODE (local
->val
) != INTEGER_CST
5319 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5321 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5325 /* If this field does not start in this (or next) byte, skip some bytes. */
5326 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5328 /* Output remnant of any bit field in previous bytes. */
5329 if (local
->byte_buffer_in_use
)
5331 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5332 local
->total_bytes
++;
5333 local
->byte_buffer_in_use
= false;
5336 /* If still not at proper byte, advance to there. */
5337 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5339 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5340 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5341 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5345 /* Set up the buffer if necessary. */
5346 if (!local
->byte_buffer_in_use
)
5350 local
->byte_buffer_in_use
= true;
5353 /* If this is nested constructor, recurse passing the bit offset and the
5354 pending data, then retrieve the new pending data afterwards. */
5355 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5357 oc_outer_state temp_state
;
5358 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5359 temp_state
.byte
= local
->byte
;
5361 += output_constructor (local
->val
, 0, 0, local
->reverse
, &temp_state
);
5362 local
->byte
= temp_state
.byte
;
5366 /* Otherwise, we must split the element into pieces that fall within
5367 separate bytes, and combine each byte with previous or following
5369 while (next_offset
< end_offset
)
5373 unsigned HOST_WIDE_INT value
;
5374 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5375 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5377 /* Advance from byte to byte within this element when necessary. */
5378 while (next_byte
!= local
->total_bytes
)
5380 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5381 local
->total_bytes
++;
5385 /* Number of bits we can process at once (all part of the same byte). */
5386 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5387 if (local
->reverse
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
5389 /* For big-endian data, take the most significant bits (of the
5390 bits that are significant) first and put them into bytes from
5391 the most significant end. */
5392 shift
= end_offset
- next_offset
- this_time
;
5394 /* Don't try to take a bunch of bits that cross
5395 the word boundary in the INTEGER_CST. We can
5396 only select bits from one element. */
5397 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5398 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5400 const int end
= shift
+ this_time
- 1;
5401 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5402 this_time
= end
- shift
+ 1;
5405 /* Now get the bits we want to insert. */
5406 value
= wi::extract_uhwi (wi::to_widest (local
->val
),
5409 /* Get the result. This works only when:
5410 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5411 local
->byte
|= value
<< (BITS_PER_UNIT
- this_time
- next_bit
);
5415 /* On little-endian machines, take the least significant bits of
5416 the value first and pack them starting at the least significant
5417 bits of the bytes. */
5418 shift
= next_offset
- byte_relative_ebitpos
;
5420 /* Don't try to take a bunch of bits that cross
5421 the word boundary in the INTEGER_CST. We can
5422 only select bits from one element. */
5423 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5424 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5426 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5428 /* Now get the bits we want to insert. */
5429 value
= wi::extract_uhwi (wi::to_widest (local
->val
),
5432 /* Get the result. This works only when:
5433 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5434 local
->byte
|= value
<< next_bit
;
5437 next_offset
+= this_time
;
5438 local
->byte_buffer_in_use
= true;
5442 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5443 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5444 caller output state of relevance in recursive invocations. */
5446 static unsigned HOST_WIDE_INT
5447 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
5448 bool reverse
, oc_outer_state
*outer
)
5450 unsigned HOST_WIDE_INT cnt
;
5451 constructor_elt
*ce
;
5452 oc_local_state local
;
5454 /* Setup our local state to communicate with helpers. */
5456 local
.type
= TREE_TYPE (exp
);
5458 local
.align
= align
;
5459 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5460 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5462 local
.min_index
= integer_zero_node
;
5464 local
.total_bytes
= 0;
5465 local
.byte_buffer_in_use
= outer
!= NULL
;
5466 local
.byte
= outer
? outer
->byte
: 0;
5467 local
.last_relative_index
= -1;
5468 /* The storage order is specified for every aggregate type. */
5469 if (AGGREGATE_TYPE_P (local
.type
))
5470 local
.reverse
= TYPE_REVERSE_STORAGE_ORDER (local
.type
);
5472 local
.reverse
= reverse
;
5474 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5476 /* As CE goes through the elements of the constant, FIELD goes through the
5477 structure fields if the constant is a structure. If the constant is a
5478 union, we override this by getting the field from the TREE_LIST element.
5479 But the constant could also be an array. Then FIELD is zero.
5481 There is always a maximum of one element in the chain LINK for unions
5482 (even if the initializer in a source program incorrectly contains
5485 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5486 local
.field
= TYPE_FIELDS (local
.type
);
5488 local
.field
= NULL_TREE
;
5491 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5492 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5494 local
.val
= ce
->value
;
5495 local
.index
= NULL_TREE
;
5497 /* The element in a union constructor specifies the proper field
5499 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5500 local
.field
= ce
->index
;
5502 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5503 local
.index
= ce
->index
;
5505 if (local
.field
&& flag_verbose_asm
)
5506 fprintf (asm_out_file
, "%s %s:\n",
5508 DECL_NAME (local
.field
)
5509 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5512 /* Eliminate the marker that makes a cast not be an lvalue. */
5513 if (local
.val
!= NULL_TREE
)
5514 STRIP_NOPS (local
.val
);
5516 /* Output the current element, using the appropriate helper ... */
5518 /* For an array slice not part of an outer bitfield. */
5520 && local
.index
!= NULL_TREE
5521 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5522 output_constructor_array_range (&local
);
5524 /* For a field that is neither a true bitfield nor part of an outer one,
5525 known to be at least byte aligned and multiple-of-bytes long. */
5527 && (local
.field
== NULL_TREE
5528 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5529 output_constructor_regular_field (&local
);
5531 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5532 supported for scalar fields, so we may need to convert first. */
5535 if (TREE_CODE (local
.val
) == REAL_CST
)
5537 = fold_unary (VIEW_CONVERT_EXPR
,
5538 build_nonstandard_integer_type
5539 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5541 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5545 /* If we are not at toplevel, save the pending data for our caller.
5546 Otherwise output the pending data and padding zeros as needed. */
5548 outer
->byte
= local
.byte
;
5551 if (local
.byte_buffer_in_use
)
5553 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5554 local
.total_bytes
++;
5557 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5559 assemble_zeros (local
.size
- local
.total_bytes
);
5560 local
.total_bytes
= local
.size
;
5564 return local
.total_bytes
;
5567 /* Mark DECL as weak. */
5570 mark_weak (tree decl
)
5572 if (DECL_WEAK (decl
))
5575 struct symtab_node
*n
= symtab_node::get (decl
);
5576 if (n
&& n
->refuse_visibility_changes
)
5577 error ("%+qD declared weak after being used", decl
);
5578 DECL_WEAK (decl
) = 1;
5580 if (DECL_RTL_SET_P (decl
)
5581 && MEM_P (DECL_RTL (decl
))
5582 && XEXP (DECL_RTL (decl
), 0)
5583 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5584 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5587 /* Merge weak status between NEWDECL and OLDDECL. */
5590 merge_weak (tree newdecl
, tree olddecl
)
5592 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5594 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5597 /* We put the NEWDECL on the weak_decls list at some point
5598 and OLDDECL as well. Keep just OLDDECL on the list. */
5599 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5600 if (TREE_VALUE (*pwd
) == newdecl
)
5602 *pwd
= TREE_CHAIN (*pwd
);
5609 if (DECL_WEAK (newdecl
))
5613 /* NEWDECL is weak, but OLDDECL is not. */
5615 /* If we already output the OLDDECL, we're in trouble; we can't
5616 go back and make it weak. This should never happen in
5617 unit-at-a-time compilation. */
5618 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5620 /* If we've already generated rtl referencing OLDDECL, we may
5621 have done so in a way that will not function properly with
5622 a weak symbol. Again in unit-at-a-time this should be
5624 gcc_assert (!TREE_USED (olddecl
)
5625 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5627 /* PR 49899: You cannot convert a static function into a weak, public function. */
5628 if (! TREE_PUBLIC (olddecl
) && TREE_PUBLIC (newdecl
))
5629 error ("weak declaration of %q+D being applied to a already "
5630 "existing, static definition", newdecl
);
5632 if (TARGET_SUPPORTS_WEAK
)
5634 /* We put the NEWDECL on the weak_decls list at some point.
5635 Replace it with the OLDDECL. */
5636 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5637 if (TREE_VALUE (wd
) == newdecl
)
5639 TREE_VALUE (wd
) = olddecl
;
5642 /* We may not find the entry on the list. If NEWDECL is a
5643 weak alias, then we will have already called
5644 globalize_decl to remove the entry; in that case, we do
5645 not need to do anything. */
5648 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5649 mark_weak (olddecl
);
5652 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5653 weak. Just update NEWDECL to indicate that it's weak too. */
5654 mark_weak (newdecl
);
5657 /* Declare DECL to be a weak symbol. */
5660 declare_weak (tree decl
)
5662 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5663 if (! TREE_PUBLIC (decl
))
5665 error ("weak declaration of %q+D must be public", decl
);
5668 else if (!TARGET_SUPPORTS_WEAK
)
5669 warning (0, "weak declaration of %q+D not supported", decl
);
5672 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5673 DECL_ATTRIBUTES (decl
)
5674 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5678 weak_finish_1 (tree decl
)
5680 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5681 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5684 if (! TREE_USED (decl
))
5687 #ifdef ASM_WEAKEN_DECL
5688 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5690 #ifdef ASM_WEAKEN_LABEL
5691 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5693 #ifdef ASM_OUTPUT_WEAK_ALIAS
5695 static bool warn_once
= 0;
5698 warning (0, "only weak aliases are supported in this configuration");
5708 /* Fiven an assembly name, find the decl it is associated with. */
5710 find_decl (tree target
)
5712 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5718 /* This TREE_LIST contains weakref targets. */
5720 static GTY(()) tree weakref_targets
;
5722 /* Emit any pending weak declarations. */
5729 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5731 tree alias_decl
= TREE_PURPOSE (t
);
5732 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5734 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
))
5735 || TREE_SYMBOL_REFERENCED (target
))
5736 /* Remove alias_decl from the weak list, but leave entries for
5737 the target alone. */
5739 #ifndef ASM_OUTPUT_WEAKREF
5740 else if (! TREE_SYMBOL_REFERENCED (target
))
5742 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5743 defined, otherwise we and weak_finish_1 would use
5744 different macros. */
5745 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5746 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5748 tree decl
= find_decl (target
);
5752 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5753 TREE_CODE (alias_decl
), target
,
5754 TREE_TYPE (alias_decl
));
5756 DECL_EXTERNAL (decl
) = 1;
5757 TREE_PUBLIC (decl
) = 1;
5758 DECL_ARTIFICIAL (decl
) = 1;
5759 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5760 TREE_USED (decl
) = 1;
5763 weak_finish_1 (decl
);
5772 /* Remove the alias and the target from the pending weak list
5773 so that we do not emit any .weak directives for the former,
5774 nor multiple .weak directives for the latter. */
5775 for (p
= &weak_decls
; (t2
= *p
) ; )
5777 if (TREE_VALUE (t2
) == alias_decl
5778 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5779 *p
= TREE_CHAIN (t2
);
5781 p
= &TREE_CHAIN (t2
);
5784 /* Remove other weakrefs to the same target, to speed things up. */
5785 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5787 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5788 *p
= TREE_CHAIN (t2
);
5790 p
= &TREE_CHAIN (t2
);
5795 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5797 tree decl
= TREE_VALUE (t
);
5799 weak_finish_1 (decl
);
5803 /* Emit the assembly bits to indicate that DECL is globally visible. */
5806 globalize_decl (tree decl
)
5809 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5810 if (DECL_WEAK (decl
))
5812 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5815 #ifdef ASM_WEAKEN_DECL
5816 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5818 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5821 /* Remove this function from the pending weak list so that
5822 we do not emit multiple .weak directives for it. */
5823 for (p
= &weak_decls
; (t
= *p
) ; )
5825 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5826 *p
= TREE_CHAIN (t
);
5828 p
= &TREE_CHAIN (t
);
5831 /* Remove weakrefs to the same target from the pending weakref
5832 list, for the same reason. */
5833 for (p
= &weakref_targets
; (t
= *p
) ; )
5835 if (DECL_ASSEMBLER_NAME (decl
)
5836 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5837 *p
= TREE_CHAIN (t
);
5839 p
= &TREE_CHAIN (t
);
5846 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5849 vec
<alias_pair
, va_gc
> *alias_pairs
;
5851 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5852 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5853 tree node is DECL to have the value of the tree node TARGET. */
5856 do_assemble_alias (tree decl
, tree target
)
5860 /* Emulated TLS had better not get this var. */
5861 gcc_assert (!(!targetm
.have_tls
5863 && DECL_THREAD_LOCAL_P (decl
)));
5865 if (TREE_ASM_WRITTEN (decl
))
5868 id
= DECL_ASSEMBLER_NAME (decl
);
5869 ultimate_transparent_alias_target (&id
);
5870 ultimate_transparent_alias_target (&target
);
5872 /* We must force creation of DECL_RTL for debug info generation, even though
5873 we don't use it here. */
5874 make_decl_rtl (decl
);
5876 TREE_ASM_WRITTEN (decl
) = 1;
5877 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5878 TREE_ASM_WRITTEN (id
) = 1;
5880 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5882 if (!TREE_SYMBOL_REFERENCED (target
))
5883 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5885 #ifdef ASM_OUTPUT_WEAKREF
5886 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5887 IDENTIFIER_POINTER (id
),
5888 IDENTIFIER_POINTER (target
));
5890 if (!TARGET_SUPPORTS_WEAK
)
5892 error_at (DECL_SOURCE_LOCATION (decl
),
5893 "weakref is not supported in this configuration");
5900 #ifdef ASM_OUTPUT_DEF
5901 tree orig_decl
= decl
;
5903 /* Make name accessible from other files, if appropriate. */
5905 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5907 globalize_decl (decl
);
5908 maybe_assemble_visibility (decl
);
5910 if (TREE_CODE (decl
) == FUNCTION_DECL
5911 && cgraph_node::get (decl
)->ifunc_resolver
)
5913 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5914 if (targetm
.has_ifunc_p ())
5915 ASM_OUTPUT_TYPE_DIRECTIVE
5916 (asm_out_file
, IDENTIFIER_POINTER (id
),
5920 error_at (DECL_SOURCE_LOCATION (decl
),
5921 "%qs is not supported on this target", "ifunc");
5924 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5925 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5927 ASM_OUTPUT_DEF (asm_out_file
,
5928 IDENTIFIER_POINTER (id
),
5929 IDENTIFIER_POINTER (target
));
5931 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5936 name
= IDENTIFIER_POINTER (id
);
5937 # ifdef ASM_WEAKEN_DECL
5938 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5940 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5942 /* Remove this function from the pending weak list so that
5943 we do not emit multiple .weak directives for it. */
5944 for (p
= &weak_decls
; (t
= *p
) ; )
5945 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5946 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5947 *p
= TREE_CHAIN (t
);
5949 p
= &TREE_CHAIN (t
);
5951 /* Remove weakrefs to the same target from the pending weakref
5952 list, for the same reason. */
5953 for (p
= &weakref_targets
; (t
= *p
) ; )
5955 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5956 *p
= TREE_CHAIN (t
);
5958 p
= &TREE_CHAIN (t
);
5964 /* Output .symver directive. */
5967 do_assemble_symver (tree decl
, tree target
)
5969 tree id
= DECL_ASSEMBLER_NAME (decl
);
5970 ultimate_transparent_alias_target (&id
);
5971 ultimate_transparent_alias_target (&target
);
5972 #ifdef ASM_OUTPUT_SYMVER_DIRECTIVE
5973 ASM_OUTPUT_SYMVER_DIRECTIVE (asm_out_file
,
5974 IDENTIFIER_POINTER (target
),
5975 IDENTIFIER_POINTER (id
));
5977 error ("symver is only supported on ELF platforms");
5981 /* Emit an assembler directive to make the symbol for DECL an alias to
5982 the symbol for TARGET. */
5985 assemble_alias (tree decl
, tree target
)
5989 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5991 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5993 ultimate_transparent_alias_target (&target
);
5995 if (alias
== target
)
5996 error ("%qs symbol %q+D ultimately targets itself", "weakref", decl
);
5997 if (TREE_PUBLIC (decl
))
5998 error ("%qs symbol %q+D must have static linkage", "weakref", decl
);
6002 #if !defined (ASM_OUTPUT_DEF)
6003 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
6004 error_at (DECL_SOURCE_LOCATION (decl
),
6005 "alias definitions not supported in this configuration");
6006 TREE_ASM_WRITTEN (decl
) = 1;
6009 if (!DECL_WEAK (decl
))
6011 /* NB: ifunc_resolver isn't set when an error is detected. */
6012 if (TREE_CODE (decl
) == FUNCTION_DECL
6013 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
6014 error_at (DECL_SOURCE_LOCATION (decl
),
6015 "%qs is not supported in this configuration", "ifunc");
6017 error_at (DECL_SOURCE_LOCATION (decl
),
6018 "only weak aliases are supported in this configuration");
6019 TREE_ASM_WRITTEN (decl
) = 1;
6025 TREE_USED (decl
) = 1;
6027 /* Allow aliases to aliases. */
6028 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6029 cgraph_node::get_create (decl
)->alias
= true;
6031 varpool_node::get_create (decl
)->alias
= true;
6033 /* If the target has already been emitted, we don't have to queue the
6034 alias. This saves a tad of memory. */
6035 if (symtab
->global_info_ready
)
6036 target_decl
= find_decl (target
);
6039 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
6040 || symtab
->state
>= EXPANSION
)
6041 do_assemble_alias (decl
, target
);
6044 alias_pair p
= {decl
, target
};
6045 vec_safe_push (alias_pairs
, p
);
6049 /* Record and output a table of translations from original function
6050 to its transaction aware clone. Note that tm_pure functions are
6051 considered to be their own clone. */
6053 struct tm_clone_hasher
: ggc_cache_ptr_hash
<tree_map
>
6055 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
6056 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
6059 keep_cache_entry (tree_map
*&e
)
6061 return ggc_marked_p (e
->base
.from
);
6065 static GTY((cache
)) hash_table
<tm_clone_hasher
> *tm_clone_hash
;
6068 record_tm_clone_pair (tree o
, tree n
)
6070 struct tree_map
**slot
, *h
;
6072 if (tm_clone_hash
== NULL
)
6073 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
6075 h
= ggc_alloc
<tree_map
> ();
6076 h
->hash
= htab_hash_pointer (o
);
6080 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
6085 get_tm_clone_pair (tree o
)
6089 struct tree_map
*h
, in
;
6092 in
.hash
= htab_hash_pointer (o
);
6093 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
6100 struct tm_alias_pair
6108 /* Dump the actual pairs to the .tm_clone_table section. */
6111 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
6115 bool switched
= false;
6117 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
6121 struct cgraph_node
*src_n
= cgraph_node::get (src
);
6122 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
6124 /* The function ipa_tm_create_version() marks the clone as needed if
6125 the original function was needed. But we also mark the clone as
6126 needed if we ever called the clone indirectly through
6127 TM_GETTMCLONE. If neither of these are true, we didn't generate
6128 a clone, and we didn't call it indirectly... no sense keeping it
6129 in the clone table. */
6130 if (!dst_n
|| !dst_n
->definition
)
6133 /* This covers the case where we have optimized the original
6134 function away, and only access the transactional clone. */
6135 if (!src_n
|| !src_n
->definition
)
6140 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
6141 assemble_align (POINTER_SIZE
);
6145 assemble_integer (XEXP (DECL_RTL (src
), 0),
6146 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6147 assemble_integer (XEXP (DECL_RTL (dst
), 0),
6148 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6152 /* Provide a default for the tm_clone_table section. */
6155 default_clone_table_section (void)
6157 return get_named_section (NULL
, ".tm_clone_table", 3);
6160 /* Helper comparison function for qsorting by the DECL_UID stored in
6161 alias_pair->emitted_diags. */
6164 tm_alias_pair_cmp (const void *x
, const void *y
)
6166 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
6167 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
6168 if (p1
->uid
< p2
->uid
)
6170 if (p1
->uid
> p2
->uid
)
6176 finish_tm_clone_pairs (void)
6178 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
6180 if (tm_clone_hash
== NULL
)
6183 /* We need a determenistic order for the .tm_clone_table, otherwise
6184 we will get bootstrap comparison failures, so dump the hash table
6185 to a vector, sort it, and dump the vector. */
6187 /* Dump the hashtable to a vector. */
6189 hash_table
<tm_clone_hasher
>::iterator iter
;
6190 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
6192 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
6193 tm_alias_pairs
.safe_push (p
);
6196 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
6199 dump_tm_clone_pairs (tm_alias_pairs
);
6201 tm_clone_hash
->empty ();
6202 tm_clone_hash
= NULL
;
6203 tm_alias_pairs
.release ();
6207 /* Emit an assembler directive to set symbol for DECL visibility to
6208 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
6211 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
6212 int vis ATTRIBUTE_UNUSED
)
6214 #ifdef HAVE_GAS_HIDDEN
6215 static const char * const visibility_types
[] = {
6216 NULL
, "protected", "hidden", "internal"
6219 const char *name
, *type
;
6222 id
= DECL_ASSEMBLER_NAME (decl
);
6223 ultimate_transparent_alias_target (&id
);
6224 name
= IDENTIFIER_POINTER (id
);
6226 type
= visibility_types
[vis
];
6228 fprintf (asm_out_file
, "\t.%s\t", type
);
6229 assemble_name (asm_out_file
, name
);
6230 fprintf (asm_out_file
, "\n");
6232 if (!DECL_ARTIFICIAL (decl
))
6233 warning (OPT_Wattributes
, "visibility attribute not supported "
6234 "in this configuration; ignored");
6238 /* A helper function to call assemble_visibility when needed for a decl. */
6241 maybe_assemble_visibility (tree decl
)
6243 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
6244 if (vis
!= VISIBILITY_DEFAULT
)
6246 targetm
.asm_out
.assemble_visibility (decl
, vis
);
6253 /* Returns 1 if the target configuration supports defining public symbols
6254 so that one of them will be chosen at link time instead of generating a
6255 multiply-defined symbol error, whether through the use of weak symbols or
6256 a target-specific mechanism for having duplicates discarded. */
6259 supports_one_only (void)
6261 if (SUPPORTS_ONE_ONLY
)
6263 return TARGET_SUPPORTS_WEAK
;
6266 /* Set up DECL as a public symbol that can be defined in multiple
6267 translation units without generating a linker error. */
6270 make_decl_one_only (tree decl
, tree comdat_group
)
6272 struct symtab_node
*symbol
;
6273 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
6275 TREE_PUBLIC (decl
) = 1;
6278 symbol
= varpool_node::get_create (decl
);
6280 symbol
= cgraph_node::get_create (decl
);
6282 if (SUPPORTS_ONE_ONLY
)
6284 #ifdef MAKE_DECL_ONE_ONLY
6285 MAKE_DECL_ONE_ONLY (decl
);
6287 symbol
->set_comdat_group (comdat_group
);
6289 else if (VAR_P (decl
)
6290 && (DECL_INITIAL (decl
) == 0
6291 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6292 DECL_COMMON (decl
) = 1;
6295 gcc_assert (TARGET_SUPPORTS_WEAK
);
6296 DECL_WEAK (decl
) = 1;
6301 init_varasm_once (void)
6303 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6304 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6305 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6307 shared_constant_pool
= create_constant_pool ();
6309 #ifdef TEXT_SECTION_ASM_OP
6310 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6311 TEXT_SECTION_ASM_OP
);
6314 #ifdef DATA_SECTION_ASM_OP
6315 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6316 DATA_SECTION_ASM_OP
);
6319 #ifdef SDATA_SECTION_ASM_OP
6320 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6321 SDATA_SECTION_ASM_OP
);
6324 #ifdef READONLY_DATA_SECTION_ASM_OP
6325 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6326 READONLY_DATA_SECTION_ASM_OP
);
6329 #ifdef CTORS_SECTION_ASM_OP
6330 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6331 CTORS_SECTION_ASM_OP
);
6334 #ifdef DTORS_SECTION_ASM_OP
6335 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6336 DTORS_SECTION_ASM_OP
);
6339 #ifdef BSS_SECTION_ASM_OP
6340 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6341 output_section_asm_op
,
6342 BSS_SECTION_ASM_OP
);
6345 #ifdef SBSS_SECTION_ASM_OP
6346 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6347 output_section_asm_op
,
6348 SBSS_SECTION_ASM_OP
);
6351 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6352 | SECTION_COMMON
, emit_tls_common
);
6353 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6354 | SECTION_COMMON
, emit_local
);
6355 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6356 | SECTION_COMMON
, emit_common
);
6358 #if defined ASM_OUTPUT_ALIGNED_BSS
6359 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6363 targetm
.asm_out
.init_sections ();
6365 if (readonly_data_section
== NULL
)
6366 readonly_data_section
= text_section
;
6368 #ifdef ASM_OUTPUT_EXTERNAL
6369 pending_assemble_externals_set
= new hash_set
<tree
>;
6374 decl_default_tls_model (const_tree decl
)
6376 enum tls_model kind
;
6379 is_local
= targetm
.binds_local_p (decl
);
6383 kind
= TLS_MODEL_LOCAL_EXEC
;
6385 kind
= TLS_MODEL_INITIAL_EXEC
;
6388 /* Local dynamic is inefficient when we're not combining the
6389 parts of the address. */
6390 else if (optimize
&& is_local
)
6391 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6393 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6394 if (kind
< flag_tls_default
)
6395 kind
= flag_tls_default
;
6400 /* Select a set of attributes for section NAME based on the properties
6401 of DECL and whether or not RELOC indicates that DECL's initializer
6402 might contain runtime relocations.
6404 We make the section read-only and executable for a function decl,
6405 read-only for a const data decl, and writable for a non-const data decl. */
6408 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6412 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6413 flags
= SECTION_CODE
;
6416 enum section_category category
6417 = categorize_decl_for_section (decl
, reloc
);
6418 if (decl_readonly_section_1 (category
))
6420 else if (category
== SECCAT_DATA_REL_RO
6421 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6422 flags
= SECTION_WRITE
| SECTION_RELRO
;
6424 flags
= SECTION_WRITE
;
6428 flags
= SECTION_WRITE
;
6429 if (strcmp (name
, ".data.rel.ro") == 0
6430 || strcmp (name
, ".data.rel.ro.local") == 0)
6431 flags
|= SECTION_RELRO
;
6434 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6435 flags
|= SECTION_LINKONCE
;
6437 if (strcmp (name
, ".vtable_map_vars") == 0)
6438 flags
|= SECTION_LINKONCE
;
6440 if (decl
&& VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6441 flags
|= SECTION_TLS
| SECTION_WRITE
;
6443 if (strcmp (name
, ".bss") == 0
6444 || strncmp (name
, ".bss.", 5) == 0
6445 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6446 || strcmp (name
, ".persistent.bss") == 0
6447 || strcmp (name
, ".sbss") == 0
6448 || strncmp (name
, ".sbss.", 6) == 0
6449 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6450 flags
|= SECTION_BSS
;
6452 if (strcmp (name
, ".tdata") == 0
6453 || strncmp (name
, ".tdata.", 7) == 0
6454 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6455 flags
|= SECTION_TLS
;
6457 if (strcmp (name
, ".tbss") == 0
6458 || strncmp (name
, ".tbss.", 6) == 0
6459 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6460 flags
|= SECTION_TLS
| SECTION_BSS
;
6462 if (strcmp (name
, ".noinit") == 0)
6463 flags
|= SECTION_WRITE
| SECTION_BSS
| SECTION_NOTYPE
;
6465 /* Various sections have special ELF types that the assembler will
6466 assign by default based on the name. They are neither SHT_PROGBITS
6467 nor SHT_NOBITS, so when changing sections we don't want to print a
6468 section type (@progbits or @nobits). Rather than duplicating the
6469 assembler's knowledge of what those special name patterns are, just
6470 let the assembler choose the type if we don't know a specific
6471 reason to set it to something other than the default. SHT_PROGBITS
6472 is the default for sections whose name is not specially known to
6473 the assembler, so it does no harm to leave the choice to the
6474 assembler when @progbits is the best thing we know to use. If
6475 someone is silly enough to emit code or TLS variables to one of
6476 these sections, then don't handle them specially.
6478 default_elf_asm_named_section (below) handles the BSS, TLS, ENTSIZE, and
6479 LINKONCE cases when NOTYPE is not set, so leave those to its logic. */
6480 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
| SECTION_ENTSIZE
))
6481 && !(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
)))
6482 flags
|= SECTION_NOTYPE
;
6487 /* Return true if the target supports some form of global BSS,
6488 either through bss_noswitch_section, or by selecting a BSS
6489 section in TARGET_ASM_SELECT_SECTION. */
6492 have_global_bss_p (void)
6494 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6497 /* Output assembly to switch to section NAME with attribute FLAGS.
6498 Four variants for common object file formats. */
6501 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6502 unsigned int flags ATTRIBUTE_UNUSED
,
6503 tree decl ATTRIBUTE_UNUSED
)
6505 /* Some object formats don't support named sections at all. The
6506 front-end should already have flagged this as an error. */
6510 #ifndef TLS_SECTION_ASM_FLAG
6511 #define TLS_SECTION_ASM_FLAG 'T'
6515 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6518 char flagchars
[11], *f
= flagchars
;
6519 unsigned int numeric_value
= 0;
6521 /* If we have already declared this section, we can use an
6522 abbreviated form to switch back to it -- unless this section is
6523 part of a COMDAT groups, in which case GAS requires the full
6524 declaration every time. */
6525 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6526 && (flags
& SECTION_DECLARED
))
6528 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6532 /* If we have a machine specific flag, then use the numeric value to pass
6534 if (targetm
.asm_out
.elf_flags_numeric (flags
, &numeric_value
))
6535 snprintf (f
, sizeof (flagchars
), "0x%08x", numeric_value
);
6538 if (!(flags
& SECTION_DEBUG
))
6540 #if HAVE_GAS_SECTION_EXCLUDE
6541 if (flags
& SECTION_EXCLUDE
)
6544 if (flags
& SECTION_WRITE
)
6546 if (flags
& SECTION_CODE
)
6548 if (flags
& SECTION_SMALL
)
6550 if (flags
& SECTION_MERGE
)
6552 if (flags
& SECTION_STRINGS
)
6554 if (flags
& SECTION_TLS
)
6555 *f
++ = TLS_SECTION_ASM_FLAG
;
6556 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6558 #ifdef MACH_DEP_SECTION_ASM_FLAG
6559 if (flags
& SECTION_MACH_DEP
)
6560 *f
++ = MACH_DEP_SECTION_ASM_FLAG
;
6565 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6567 /* default_section_type_flags (above) knows which flags need special
6568 handling here, and sets NOTYPE when none of these apply so that the
6569 assembler's logic for default types can apply to user-chosen
6571 if (!(flags
& SECTION_NOTYPE
))
6576 if (flags
& SECTION_BSS
)
6582 /* On platforms that use "@" as the assembly comment character,
6584 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6586 fprintf (asm_out_file
, format
, type
);
6588 if (flags
& SECTION_ENTSIZE
)
6589 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6590 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6592 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6593 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6595 fprintf (asm_out_file
, ",%s,comdat",
6596 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6600 putc ('\n', asm_out_file
);
6604 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6605 tree decl ATTRIBUTE_UNUSED
)
6607 char flagchars
[8], *f
= flagchars
;
6609 if (flags
& SECTION_WRITE
)
6611 if (flags
& SECTION_CODE
)
6615 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6619 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6622 default_coff_asm_named_section (name
, flags
, decl
);
6624 if (flags
& SECTION_LINKONCE
)
6626 /* Functions may have been compiled at various levels of
6627 optimization so we can't use `same_size' here.
6628 Instead, have the linker pick one. */
6629 fprintf (asm_out_file
, "\t.linkonce %s\n",
6630 (flags
& SECTION_CODE
? "discard" : "same_size"));
6634 /* The lame default section selector. */
6637 default_select_section (tree decl
, int reloc
,
6638 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6642 if (decl_readonly_section (decl
, reloc
))
6643 return readonly_data_section
;
6645 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6647 if (! ((flag_pic
&& reloc
)
6648 || !TREE_READONLY (decl
)
6649 || TREE_SIDE_EFFECTS (decl
)
6650 || !TREE_CONSTANT (decl
)))
6651 return readonly_data_section
;
6653 else if (TREE_CODE (decl
) == STRING_CST
)
6654 return readonly_data_section
;
6655 else if (! (flag_pic
&& reloc
))
6656 return readonly_data_section
;
6658 return data_section
;
6661 enum section_category
6662 categorize_decl_for_section (const_tree decl
, int reloc
)
6664 enum section_category ret
;
6666 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6668 else if (TREE_CODE (decl
) == STRING_CST
)
6670 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6671 && asan_protect_global (CONST_CAST_TREE (decl
)))
6672 /* or !flag_merge_constants */
6673 return SECCAT_RODATA
;
6675 return SECCAT_RODATA_MERGE_STR
;
6677 else if (VAR_P (decl
))
6679 tree d
= CONST_CAST_TREE (decl
);
6680 if (bss_initializer_p (decl
))
6682 else if (! TREE_READONLY (decl
)
6683 || TREE_SIDE_EFFECTS (decl
)
6684 || (DECL_INITIAL (decl
)
6685 && ! TREE_CONSTANT (DECL_INITIAL (decl
))))
6687 /* Here the reloc_rw_mask is not testing whether the section should
6688 be read-only or not, but whether the dynamic link will have to
6689 do something. If so, we wish to segregate the data in order to
6690 minimize cache misses inside the dynamic linker. */
6691 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6692 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6696 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6697 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6698 else if (reloc
|| flag_merge_constants
< 2
6699 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6700 /* PR 81697: for architectures that use section anchors we
6701 need to ignore DECL_RTL_SET_P (decl) for string constants
6702 inside this asan_protect_global call because otherwise
6703 we'll wrongly put them into SECCAT_RODATA_MERGE_CONST
6704 section, set DECL_RTL (decl) later on and add DECL to
6705 protected globals via successive asan_protect_global
6706 calls. In this scenario we'll end up with wrong
6707 alignment of these strings at runtime and possible ASan
6709 && asan_protect_global (d
, use_object_blocks_p ()
6710 && use_blocks_for_decl_p (d
))))
6711 /* C and C++ don't allow different variables to share the same
6712 location. -fmerge-all-constants allows even that (at the
6713 expense of not conforming). */
6714 ret
= SECCAT_RODATA
;
6715 else if (DECL_INITIAL (decl
)
6716 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6717 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6719 ret
= SECCAT_RODATA_MERGE_CONST
;
6721 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6723 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6724 || TREE_SIDE_EFFECTS (decl
)
6725 || ! TREE_CONSTANT (decl
))
6728 ret
= SECCAT_RODATA
;
6731 ret
= SECCAT_RODATA
;
6733 /* There are no read-only thread-local sections. */
6734 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6736 /* Note that this would be *just* SECCAT_BSS, except that there's
6737 no concept of a read-only thread-local-data section. */
6738 if (ret
== SECCAT_BSS
6739 || DECL_INITIAL (decl
) == NULL
6740 || (flag_zero_initialized_in_bss
6741 && initializer_zerop (DECL_INITIAL (decl
))))
6747 /* If the target uses small data sections, select it. */
6748 else if (targetm
.in_small_data_p (decl
))
6750 if (ret
== SECCAT_BSS
)
6752 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6753 ret
= SECCAT_SRODATA
;
6762 decl_readonly_section_1 (enum section_category category
)
6767 case SECCAT_RODATA_MERGE_STR
:
6768 case SECCAT_RODATA_MERGE_STR_INIT
:
6769 case SECCAT_RODATA_MERGE_CONST
:
6770 case SECCAT_SRODATA
:
6778 decl_readonly_section (const_tree decl
, int reloc
)
6780 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6783 /* Select a section based on the above categorization. */
6786 default_elf_select_section (tree decl
, int reloc
,
6787 unsigned HOST_WIDE_INT align
)
6791 switch (categorize_decl_for_section (decl
, reloc
))
6794 /* We're not supposed to be called on FUNCTION_DECLs. */
6797 return readonly_data_section
;
6798 case SECCAT_RODATA_MERGE_STR
:
6799 return mergeable_string_section (decl
, align
, 0);
6800 case SECCAT_RODATA_MERGE_STR_INIT
:
6801 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6802 case SECCAT_RODATA_MERGE_CONST
:
6803 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6804 case SECCAT_SRODATA
:
6808 return data_section
;
6809 case SECCAT_DATA_REL
:
6810 sname
= ".data.rel";
6812 case SECCAT_DATA_REL_LOCAL
:
6813 sname
= ".data.rel.local";
6815 case SECCAT_DATA_REL_RO
:
6816 sname
= ".data.rel.ro";
6818 case SECCAT_DATA_REL_RO_LOCAL
:
6819 sname
= ".data.rel.ro.local";
6829 && lookup_attribute ("noinit", DECL_ATTRIBUTES (decl
)) != NULL_TREE
)
6849 return get_named_section (decl
, sname
, reloc
);
6852 /* Construct a unique section name based on the decl name and the
6853 categorization performed above. */
6856 default_unique_section (tree decl
, int reloc
)
6858 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6859 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6860 const char *prefix
, *name
, *linkonce
;
6864 switch (categorize_decl_for_section (decl
, reloc
))
6867 prefix
= one_only
? ".t" : ".text";
6870 case SECCAT_RODATA_MERGE_STR
:
6871 case SECCAT_RODATA_MERGE_STR_INIT
:
6872 case SECCAT_RODATA_MERGE_CONST
:
6873 prefix
= one_only
? ".r" : ".rodata";
6875 case SECCAT_SRODATA
:
6876 prefix
= one_only
? ".s2" : ".sdata2";
6879 prefix
= one_only
? ".d" : ".data";
6881 case SECCAT_DATA_REL
:
6882 prefix
= one_only
? ".d.rel" : ".data.rel";
6884 case SECCAT_DATA_REL_LOCAL
:
6885 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6887 case SECCAT_DATA_REL_RO
:
6888 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6890 case SECCAT_DATA_REL_RO_LOCAL
:
6891 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6894 prefix
= one_only
? ".s" : ".sdata";
6897 prefix
= one_only
? ".b" : ".bss";
6900 prefix
= one_only
? ".sb" : ".sbss";
6903 prefix
= one_only
? ".td" : ".tdata";
6906 prefix
= one_only
? ".tb" : ".tbss";
6912 id
= DECL_ASSEMBLER_NAME (decl
);
6913 ultimate_transparent_alias_target (&id
);
6914 name
= IDENTIFIER_POINTER (id
);
6915 name
= targetm
.strip_name_encoding (name
);
6917 /* If we're using one_only, then there needs to be a .gnu.linkonce
6918 prefix to the section name. */
6919 linkonce
= one_only
? ".gnu.linkonce" : "";
6921 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6923 set_decl_section_name (decl
, string
);
6926 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6929 compute_reloc_for_rtx_1 (const_rtx x
)
6931 switch (GET_CODE (x
))
6934 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6942 /* Like compute_reloc_for_constant, except for an RTX. The return value
6943 is a mask for which bit 1 indicates a global relocation, and bit 0
6944 indicates a local relocation. */
6947 compute_reloc_for_rtx (const_rtx x
)
6949 switch (GET_CODE (x
))
6953 return compute_reloc_for_rtx_1 (x
);
6958 subrtx_iterator::array_type array
;
6959 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6960 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6970 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6972 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6974 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6975 return data_section
;
6977 return readonly_data_section
;
6981 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6982 unsigned HOST_WIDE_INT align
)
6984 int reloc
= compute_reloc_for_rtx (x
);
6986 /* ??? Handle small data here somehow. */
6988 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6991 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6993 return get_named_section (NULL
, ".data.rel.ro", 3);
6996 return mergeable_constant_section (mode
, align
, 0);
6999 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
7002 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
7007 /* Careful not to prod global register variables. */
7010 symbol
= XEXP (rtl
, 0);
7011 if (GET_CODE (symbol
) != SYMBOL_REF
)
7014 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
7015 if (TREE_CODE (decl
) == FUNCTION_DECL
)
7016 flags
|= SYMBOL_FLAG_FUNCTION
;
7017 if (targetm
.binds_local_p (decl
))
7018 flags
|= SYMBOL_FLAG_LOCAL
;
7019 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
7020 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
7021 else if (targetm
.in_small_data_p (decl
))
7022 flags
|= SYMBOL_FLAG_SMALL
;
7023 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
7024 being PUBLIC, the thing *must* be defined in this translation unit.
7025 Prevent this buglet from being propagated into rtl code as well. */
7026 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
7027 flags
|= SYMBOL_FLAG_EXTERNAL
;
7029 SYMBOL_REF_FLAGS (symbol
) = flags
;
7032 /* By default, we do nothing for encode_section_info, so we need not
7033 do anything but discard the '*' marker. */
7036 default_strip_name_encoding (const char *str
)
7038 return str
+ (*str
== '*');
7041 #ifdef ASM_OUTPUT_DEF
7042 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
7043 anchor relative to ".", the current section position. */
7046 default_asm_output_anchor (rtx symbol
)
7050 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
7051 SYMBOL_REF_BLOCK_OFFSET (symbol
));
7052 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
7056 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
7059 default_use_anchors_for_symbol_p (const_rtx symbol
)
7062 section
*sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
7064 /* This function should only be called with non-zero SYMBOL_REF_BLOCK,
7065 furthermore get_block_for_section should not create object blocks
7066 for mergeable sections. */
7067 gcc_checking_assert (sect
&& !(sect
->common
.flags
& SECTION_MERGE
));
7069 /* Don't use anchors for small data sections. The small data register
7070 acts as an anchor for such sections. */
7071 if (sect
->common
.flags
& SECTION_SMALL
)
7074 decl
= SYMBOL_REF_DECL (symbol
);
7075 if (decl
&& DECL_P (decl
))
7077 /* Don't use section anchors for decls that might be defined or
7078 usurped by other modules. */
7079 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
7082 /* Don't use section anchors for decls that will be placed in a
7083 small data section. */
7084 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
7085 one above. The problem is that we only use SECTION_SMALL for
7086 sections that should be marked as small in the section directive. */
7087 if (targetm
.in_small_data_p (decl
))
7090 /* Don't use section anchors for decls that won't fit inside a single
7091 anchor range to reduce the amount of instructions required to refer
7092 to the entire declaration. */
7093 if (DECL_SIZE_UNIT (decl
) == NULL_TREE
7094 || !tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
))
7095 || (tree_to_uhwi (DECL_SIZE_UNIT (decl
))
7096 >= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
))
7103 /* Return true when RESOLUTION indicate that symbol will be bound to the
7104 definition provided by current .o file. */
7107 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
7109 return (resolution
== LDPR_PREVAILING_DEF
7110 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
7111 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
7114 /* Return true when RESOLUTION indicate that symbol will be bound locally
7115 within current executable or DSO. */
7118 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
7120 return (resolution
== LDPR_PREVAILING_DEF
7121 || resolution
== LDPR_PREVAILING_DEF_IRONLY
7122 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
7123 || resolution
== LDPR_PREEMPTED_REG
7124 || resolution
== LDPR_PREEMPTED_IR
7125 || resolution
== LDPR_RESOLVED_IR
7126 || resolution
== LDPR_RESOLVED_EXEC
);
7129 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
7130 uninitialized common symbol in the executable will still be defined
7131 (through COPY relocation) in the executable. */
7134 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
7135 bool extern_protected_data
, bool common_local_p
)
7137 /* A non-decl is an entry in the constant pool. */
7141 /* Weakrefs may not bind locally, even though the weakref itself is always
7142 static and therefore local. Similarly, the resolver for ifunc functions
7143 might resolve to a non-local function.
7144 FIXME: We can resolve the weakref case more curefuly by looking at the
7146 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
7147 || (TREE_CODE (exp
) == FUNCTION_DECL
7148 && cgraph_node::get (exp
)
7149 && cgraph_node::get (exp
)->ifunc_resolver
))
7152 /* Static variables are always local. */
7153 if (! TREE_PUBLIC (exp
))
7156 /* With resolution file in hand, take look into resolutions.
7157 We can't just return true for resolved_locally symbols,
7158 because dynamic linking might overwrite symbols
7159 in shared libraries. */
7160 bool resolved_locally
= false;
7162 bool uninited_common
= (DECL_COMMON (exp
)
7163 && (DECL_INITIAL (exp
) == NULL
7165 && DECL_INITIAL (exp
) == error_mark_node
)));
7167 /* A non-external variable is defined locally only if it isn't
7168 uninitialized COMMON variable or common_local_p is true. */
7169 bool defined_locally
= (!DECL_EXTERNAL (exp
)
7170 && (!uninited_common
|| common_local_p
));
7171 if (symtab_node
*node
= symtab_node::get (exp
))
7173 if (node
->in_other_partition
)
7174 defined_locally
= true;
7175 if (node
->can_be_discarded_p ())
7177 else if (resolution_to_local_definition_p (node
->resolution
))
7178 defined_locally
= resolved_locally
= true;
7179 else if (resolution_local_p (node
->resolution
))
7180 resolved_locally
= true;
7182 if (defined_locally
&& weak_dominate
&& !shlib
)
7183 resolved_locally
= true;
7185 /* Undefined weak symbols are never defined locally. */
7186 if (DECL_WEAK (exp
) && !defined_locally
)
7189 /* A symbol is local if the user has said explicitly that it will be,
7190 or if we have a definition for the symbol. We cannot infer visibility
7191 for undefined symbols. */
7192 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
7193 && (TREE_CODE (exp
) == FUNCTION_DECL
7194 || !extern_protected_data
7195 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
7196 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
7199 /* If PIC, then assume that any global name can be overridden by
7200 symbols resolved from other modules. */
7204 /* Variables defined outside this object might not be local. */
7205 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
7208 /* Non-dominant weak symbols are not defined locally. */
7209 if (DECL_WEAK (exp
) && !resolved_locally
)
7212 /* Uninitialized COMMON variable may be unified with symbols
7213 resolved from other modules. */
7214 if (uninited_common
&& !resolved_locally
)
7217 /* Otherwise we're left with initialized (or non-common) global data
7218 which is of necessity defined locally. */
7222 /* Assume ELF-ish defaults, since that's pretty much the most liberal
7223 wrt cross-module name binding. */
7226 default_binds_local_p (const_tree exp
)
7228 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
7231 /* Similar to default_binds_local_p, but common symbol may be local and
7232 extern protected data is non-local. */
7235 default_binds_local_p_2 (const_tree exp
)
7237 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, true,
7242 default_binds_local_p_1 (const_tree exp
, int shlib
)
7244 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
7247 /* Return true when references to DECL must bind to current definition in
7250 The condition is usually equivalent to whether the function binds to the
7251 current module (shared library or executable), that is to binds_local_p.
7252 We use this fact to avoid need for another target hook and implement
7253 the logic using binds_local_p and just special cases where
7254 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
7255 the weak definitions (that can be overwritten at linktime by other
7256 definition from different object file) and when resolution info is available
7257 we simply use the knowledge passed to us by linker plugin. */
7259 decl_binds_to_current_def_p (const_tree decl
)
7261 gcc_assert (DECL_P (decl
));
7262 if (!targetm
.binds_local_p (decl
))
7264 if (!TREE_PUBLIC (decl
))
7267 /* When resolution is available, just use it. */
7268 if (symtab_node
*node
= symtab_node::get (decl
))
7270 if (node
->resolution
!= LDPR_UNKNOWN
7271 && !node
->can_be_discarded_p ())
7272 return resolution_to_local_definition_p (node
->resolution
);
7275 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
7276 binds locally but still can be overwritten), DECL_COMMON (can be merged
7277 with a non-common definition somewhere in the same module) or
7279 This rely on fact that binds_local_p behave as decl_replaceable_p
7280 for all other declaration types. */
7281 if (DECL_WEAK (decl
))
7283 if (DECL_COMMON (decl
)
7284 && (DECL_INITIAL (decl
) == NULL
7285 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
7287 if (DECL_EXTERNAL (decl
))
7292 /* A replaceable function or variable is one which may be replaced
7293 at link-time with an entirely different definition, provided that the
7294 replacement has the same type. For example, functions declared
7295 with __attribute__((weak)) on most systems are replaceable.
7297 COMDAT functions are not replaceable, since all definitions of the
7298 function must be equivalent. It is important that COMDAT functions
7299 not be treated as replaceable so that use of C++ template
7300 instantiations is not penalized. */
7303 decl_replaceable_p (tree decl
)
7305 gcc_assert (DECL_P (decl
));
7306 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
7308 if (!flag_semantic_interposition
7309 && !DECL_WEAK (decl
))
7311 return !decl_binds_to_current_def_p (decl
);
7314 /* Default function to output code that will globalize a label. A
7315 target must define GLOBAL_ASM_OP or provide its own function to
7316 globalize a label. */
7317 #ifdef GLOBAL_ASM_OP
7319 default_globalize_label (FILE * stream
, const char *name
)
7321 fputs (GLOBAL_ASM_OP
, stream
);
7322 assemble_name (stream
, name
);
7323 putc ('\n', stream
);
7325 #endif /* GLOBAL_ASM_OP */
7327 /* Default function to output code that will globalize a declaration. */
7329 default_globalize_decl_name (FILE * stream
, tree decl
)
7331 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7332 targetm
.asm_out
.globalize_label (stream
, name
);
7335 /* Default function to output a label for unwind information. The
7336 default is to do nothing. A target that needs nonlocal labels for
7337 unwind information must provide its own function to do this. */
7339 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7340 tree decl ATTRIBUTE_UNUSED
,
7341 int for_eh ATTRIBUTE_UNUSED
,
7342 int empty ATTRIBUTE_UNUSED
)
7346 /* Default function to output a label to divide up the exception table.
7347 The default is to do nothing. A target that needs/wants to divide
7348 up the table must provide it's own function to do this. */
7350 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7354 /* This is how to output an internal numbered label where PREFIX is
7355 the class of label and LABELNO is the number within the class. */
7358 default_generate_internal_label (char *buf
, const char *prefix
,
7359 unsigned long labelno
)
7361 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7364 /* This is how to output an internal numbered label where PREFIX is
7365 the class of label and LABELNO is the number within the class. */
7368 default_internal_label (FILE *stream
, const char *prefix
,
7369 unsigned long labelno
)
7371 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7372 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7373 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7377 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7380 default_asm_declare_constant_name (FILE *file
, const char *name
,
7381 const_tree exp ATTRIBUTE_UNUSED
,
7382 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7384 assemble_label (file
, name
);
7387 /* This is the default behavior at the beginning of a file. It's
7388 controlled by two other target-hook toggles. */
7390 default_file_start (void)
7392 if (targetm
.asm_file_start_app_off
7393 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7394 fputs (ASM_APP_OFF
, asm_out_file
);
7396 if (targetm
.asm_file_start_file_directive
)
7398 /* LTO produced units have no meaningful main_input_filename. */
7400 output_file_directive (asm_out_file
, "<artificial>");
7402 output_file_directive (asm_out_file
, main_input_filename
);
7406 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7407 which emits a special section directive used to indicate whether or
7408 not this object file needs an executable stack. This is primarily
7409 a GNU extension to ELF but could be used on other targets. */
7411 int trampolines_created
;
7414 file_end_indicate_exec_stack (void)
7416 unsigned int flags
= SECTION_DEBUG
;
7417 if (trampolines_created
)
7418 flags
|= SECTION_CODE
;
7420 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7423 /* Emit a special section directive to indicate that this object file
7424 was compiled with -fsplit-stack. This is used to let the linker
7425 detect calls between split-stack code and non-split-stack code, so
7426 that it can modify the split-stack code to allocate a sufficiently
7427 large stack. We emit another special section if there are any
7428 functions in this file which have the no_split_stack attribute, to
7429 prevent the linker from warning about being unable to convert the
7430 functions if they call non-split-stack code. */
7433 file_end_indicate_split_stack (void)
7435 if (flag_split_stack
)
7437 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7439 if (saw_no_split_stack
)
7440 switch_to_section (get_section (".note.GNU-no-split-stack",
7441 SECTION_DEBUG
, NULL
));
7445 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7446 a get_unnamed_section callback. */
7449 output_section_asm_op (const void *directive
)
7451 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7454 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7455 the current section is NEW_SECTION. */
7458 switch_to_section (section
*new_section
)
7460 if (in_section
== new_section
)
7463 if (new_section
->common
.flags
& SECTION_FORGET
)
7466 in_section
= new_section
;
7468 switch (SECTION_STYLE (new_section
))
7471 targetm
.asm_out
.named_section (new_section
->named
.name
,
7472 new_section
->named
.common
.flags
,
7473 new_section
->named
.decl
);
7476 case SECTION_UNNAMED
:
7477 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7480 case SECTION_NOSWITCH
:
7485 new_section
->common
.flags
|= SECTION_DECLARED
;
7488 /* If block symbol SYMBOL has not yet been assigned an offset, place
7489 it at the end of its block. */
7492 place_block_symbol (rtx symbol
)
7494 unsigned HOST_WIDE_INT size
, mask
, offset
;
7495 class constant_descriptor_rtx
*desc
;
7496 unsigned int alignment
;
7497 struct object_block
*block
;
7500 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7501 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7504 /* Work out the symbol's size and alignment. */
7505 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7507 desc
= SYMBOL_REF_CONSTANT (symbol
);
7508 alignment
= desc
->align
;
7509 size
= GET_MODE_SIZE (desc
->mode
);
7511 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7513 decl
= SYMBOL_REF_DECL (symbol
);
7514 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7515 alignment
= DECL_ALIGN (decl
);
7516 size
= get_constant_size (DECL_INITIAL (decl
));
7517 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7518 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7519 && asan_protect_global (DECL_INITIAL (decl
)))
7521 size
+= asan_red_zone_size (size
);
7522 alignment
= MAX (alignment
,
7523 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7528 struct symtab_node
*snode
;
7529 decl
= SYMBOL_REF_DECL (symbol
);
7531 snode
= symtab_node::get (decl
);
7534 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7536 gcc_assert (MEM_P (target
)
7537 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7538 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7539 target
= XEXP (target
, 0);
7540 place_block_symbol (target
);
7541 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7544 alignment
= get_variable_align (decl
);
7545 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7546 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7547 && asan_protect_global (decl
))
7549 size
+= asan_red_zone_size (size
);
7550 alignment
= MAX (alignment
,
7551 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7555 /* Calculate the object's offset from the start of the block. */
7556 block
= SYMBOL_REF_BLOCK (symbol
);
7557 mask
= alignment
/ BITS_PER_UNIT
- 1;
7558 offset
= (block
->size
+ mask
) & ~mask
;
7559 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7561 /* Record the block's new alignment and size. */
7562 block
->alignment
= MAX (block
->alignment
, alignment
);
7563 block
->size
= offset
+ size
;
7565 vec_safe_push (block
->objects
, symbol
);
7568 /* Return the anchor that should be used to address byte offset OFFSET
7569 from the first object in BLOCK. MODEL is the TLS model used
7573 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7574 enum tls_model model
)
7577 unsigned int begin
, middle
, end
;
7578 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7581 /* Work out the anchor's offset. Use an offset of 0 for the first
7582 anchor so that we don't pessimize the case where we take the address
7583 of a variable at the beginning of the block. This is particularly
7584 useful when a block has only one variable assigned to it.
7586 We try to place anchors RANGE bytes apart, so there can then be
7587 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7588 a ptr_mode offset. With some target settings, the lowest such
7589 anchor might be out of range for the lowest ptr_mode offset;
7590 likewise the highest anchor for the highest offset. Use anchors
7591 at the extreme ends of the ptr_mode range in such cases.
7593 All arithmetic uses unsigned integers in order to avoid
7595 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7596 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7597 range
= max_offset
- min_offset
+ 1;
7602 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7605 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7606 delta
-= delta
% range
;
7609 offset
= (HOST_WIDE_INT
) (-delta
);
7613 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7614 delta
-= delta
% range
;
7615 if (delta
> bias
- 1)
7617 offset
= (HOST_WIDE_INT
) delta
;
7621 /* Do a binary search to see if there's already an anchor we can use.
7622 Set BEGIN to the new anchor's index if not. */
7624 end
= vec_safe_length (block
->anchors
);
7625 while (begin
!= end
)
7627 middle
= (end
+ begin
) / 2;
7628 anchor
= (*block
->anchors
)[middle
];
7629 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7631 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7633 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7635 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7641 /* Create a new anchor with a unique label. */
7642 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7643 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7644 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7645 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7647 /* Insert it at index BEGIN. */
7648 vec_safe_insert (block
->anchors
, begin
, anchor
);
7652 /* Output the objects in BLOCK. */
7655 output_object_block (struct object_block
*block
)
7657 class constant_descriptor_rtx
*desc
;
7659 HOST_WIDE_INT offset
;
7663 if (!block
->objects
)
7666 /* Switch to the section and make sure that the first byte is
7667 suitably aligned. */
7668 /* Special case VTV comdat sections similar to assemble_variable. */
7669 if (SECTION_STYLE (block
->sect
) == SECTION_NAMED
7670 && block
->sect
->named
.name
7671 && (strcmp (block
->sect
->named
.name
, ".vtable_map_vars") == 0))
7672 handle_vtv_comdat_section (block
->sect
, block
->sect
->named
.decl
);
7674 switch_to_section (block
->sect
);
7676 gcc_checking_assert (!(block
->sect
->common
.flags
& SECTION_MERGE
));
7677 assemble_align (block
->alignment
);
7679 /* Define the values of all anchors relative to the current section
7681 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7682 targetm
.asm_out
.output_anchor (symbol
);
7684 /* Output the objects themselves. */
7686 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7688 /* Move to the object's offset, padding with zeros if necessary. */
7689 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7690 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7691 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7693 desc
= SYMBOL_REF_CONSTANT (symbol
);
7694 /* Pass 1 for align as we have already laid out everything in the block.
7695 So aligning shouldn't be necessary. */
7696 output_constant_pool_1 (desc
, 1);
7697 offset
+= GET_MODE_SIZE (desc
->mode
);
7699 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7702 decl
= SYMBOL_REF_DECL (symbol
);
7703 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7704 DECL_ALIGN (decl
), false);
7706 size
= get_constant_size (DECL_INITIAL (decl
));
7708 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7709 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7710 && asan_protect_global (DECL_INITIAL (decl
)))
7712 size
= asan_red_zone_size (size
);
7713 assemble_zeros (size
);
7720 decl
= SYMBOL_REF_DECL (symbol
);
7721 assemble_variable_contents (decl
, XSTR (symbol
, 0), false, false);
7722 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7724 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7725 && asan_protect_global (decl
))
7727 size
= asan_red_zone_size (size
);
7728 assemble_zeros (size
);
7735 /* A callback for qsort to compare object_blocks. */
7738 output_object_block_compare (const void *x
, const void *y
)
7740 object_block
*p1
= *(object_block
* const*)x
;
7741 object_block
*p2
= *(object_block
* const*)y
;
7743 if (p1
->sect
->common
.flags
& SECTION_NAMED
7744 && !(p2
->sect
->common
.flags
& SECTION_NAMED
))
7747 if (!(p1
->sect
->common
.flags
& SECTION_NAMED
)
7748 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7751 if (p1
->sect
->common
.flags
& SECTION_NAMED
7752 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7753 return strcmp (p1
->sect
->named
.name
, p2
->sect
->named
.name
);
7755 unsigned f1
= p1
->sect
->common
.flags
;
7756 unsigned f2
= p2
->sect
->common
.flags
;
7759 return f1
< f2
? -1 : 1;
7762 /* Output the definitions of all object_blocks. */
7765 output_object_blocks (void)
7767 vec
<object_block
*, va_heap
> v
;
7768 v
.create (object_block_htab
->elements ());
7770 hash_table
<object_block_hasher
>::iterator hi
;
7772 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab
, obj
, object_block
*, hi
)
7775 /* Sort them in order to output them in a deterministic manner,
7776 otherwise we may get .rodata sections in different orders with
7778 v
.qsort (output_object_block_compare
);
7780 FOR_EACH_VEC_ELT (v
, i
, obj
)
7781 output_object_block (obj
);
7786 /* This function provides a possible implementation of the
7787 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7788 by -frecord-gcc-switches it creates a new mergeable, string section in the
7789 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7790 contains the switches in ASCII format.
7792 FIXME: This code does not correctly handle double quote characters
7793 that appear inside strings, (it strips them rather than preserving them).
7794 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7795 characters - instead it treats them as sub-string separators. Since
7796 we want to emit NUL strings terminators into the object file we have to use
7800 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7804 case SWITCH_TYPE_PASSED
:
7805 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7806 ASM_OUTPUT_SKIP (asm_out_file
, HOST_WIDE_INT_1U
);
7809 case SWITCH_TYPE_DESCRIPTIVE
:
7812 /* Distinguish between invocations where name is NULL. */
7813 static bool started
= false;
7819 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7823 | (SECTION_ENTSIZE
& 1),
7825 switch_to_section (sec
);
7834 /* The return value is currently ignored by the caller, but must be 0.
7835 For -fverbose-asm the return value would be the number of characters
7836 emitted into the assembler file. */
7840 /* Emit text to declare externally defined symbols. It is needed to
7841 properly support non-default visibility. */
7843 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7845 const char *name ATTRIBUTE_UNUSED
)
7847 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7848 set in order to avoid putting out names that are never really
7849 used. Always output visibility specified in the source. */
7850 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7851 && (DECL_VISIBILITY_SPECIFIED (decl
)
7852 || targetm
.binds_local_p (decl
)))
7853 maybe_assemble_visibility (decl
);
7856 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7859 default_asm_output_source_filename (FILE *file
, const char *name
)
7861 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7862 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7864 fprintf (file
, "\t.file\t");
7865 output_quoted_string (file
, name
);
7870 /* Output a file name in the form wanted by System V. */
7873 output_file_directive (FILE *asm_file
, const char *input_name
)
7878 if (input_name
== NULL
)
7879 input_name
= "<stdin>";
7881 input_name
= remap_debug_filename (input_name
);
7883 len
= strlen (input_name
);
7884 na
= input_name
+ len
;
7886 /* NA gets INPUT_NAME sans directory names. */
7887 while (na
> input_name
)
7889 if (IS_DIR_SEPARATOR (na
[-1]))
7894 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7897 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7900 make_debug_expr_from_rtl (const_rtx exp
)
7902 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7903 machine_mode mode
= GET_MODE (exp
);
7906 DECL_ARTIFICIAL (ddecl
) = 1;
7907 if (REG_P (exp
) && REG_EXPR (exp
))
7908 type
= TREE_TYPE (REG_EXPR (exp
));
7909 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7910 type
= TREE_TYPE (MEM_EXPR (exp
));
7913 if (type
&& TYPE_MODE (type
) == mode
)
7914 TREE_TYPE (ddecl
) = type
;
7916 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7917 SET_DECL_MODE (ddecl
, mode
);
7918 dval
= gen_rtx_DEBUG_EXPR (mode
);
7919 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7920 SET_DECL_RTL (ddecl
, dval
);
7924 #ifdef ELF_ASCII_ESCAPES
7925 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7928 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7933 fputs (STRING_ASM_OP
, f
);
7938 escape
= ELF_ASCII_ESCAPES
[c
];
7946 putc ('0'+((c
>>6)&7), f
);
7947 putc ('0'+((c
>>3)&7), f
);
7948 putc ('0'+(c
&7), f
);
7961 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7964 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7966 const char *limit
= s
+ len
;
7967 const char *last_null
= NULL
;
7968 unsigned bytes_in_chunk
= 0;
7972 for (; s
< limit
; s
++)
7976 if (bytes_in_chunk
>= 60)
7985 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7992 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7994 if (bytes_in_chunk
> 0)
8001 default_elf_asm_output_limited_string (f
, s
);
8006 if (bytes_in_chunk
== 0)
8007 fputs (ASCII_DATA_ASM_OP
"\"", f
);
8010 escape
= ELF_ASCII_ESCAPES
[c
];
8019 putc ('0'+((c
>>6)&7), f
);
8020 putc ('0'+((c
>>3)&7), f
);
8021 putc ('0'+(c
&7), f
);
8022 bytes_in_chunk
+= 4;
8027 bytes_in_chunk
+= 2;
8034 if (bytes_in_chunk
> 0)
8042 static GTY(()) section
*elf_init_array_section
;
8043 static GTY(()) section
*elf_fini_array_section
;
8046 get_elf_initfini_array_priority_section (int priority
,
8050 if (priority
!= DEFAULT_INIT_PRIORITY
)
8053 sprintf (buf
, "%s.%.5u",
8054 constructor_p
? ".init_array" : ".fini_array",
8056 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
8062 if (elf_init_array_section
== NULL
)
8063 elf_init_array_section
8064 = get_section (".init_array",
8065 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
8066 sec
= elf_init_array_section
;
8070 if (elf_fini_array_section
== NULL
)
8071 elf_fini_array_section
8072 = get_section (".fini_array",
8073 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
8074 sec
= elf_fini_array_section
;
8080 /* Use .init_array section for constructors. */
8083 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
8085 section
*sec
= get_elf_initfini_array_priority_section (priority
,
8087 assemble_addr_to_section (symbol
, sec
);
8090 /* Use .fini_array section for destructors. */
8093 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
8095 section
*sec
= get_elf_initfini_array_priority_section (priority
,
8097 assemble_addr_to_section (symbol
, sec
);
8100 /* Default TARGET_ASM_OUTPUT_IDENT hook.
8102 This is a bit of a cheat. The real default is a no-op, but this
8103 hook is the default for all targets with a .ident directive. */
8106 default_asm_output_ident_directive (const char *ident_str
)
8108 const char *ident_asm_op
= "\t.ident\t";
8110 /* If we are still in the front end, do not write out the string
8111 to asm_out_file. Instead, add a fake top-level asm statement.
8112 This allows the front ends to use this hook without actually
8113 writing to asm_out_file, to handle #ident or Pragma Ident. */
8114 if (symtab
->state
== PARSING
)
8116 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
8117 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
8120 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
8124 /* This function ensures that vtable_map variables are not only
8125 in the comdat section, but that each variable has its own unique
8126 comdat name. Without this the variables end up in the same section
8127 with a single comdat name.
8129 FIXME: resolve_unique_section needs to deal better with
8130 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
8131 that is fixed, this if-else statement can be replaced with
8132 a single call to "switch_to_section (sect)". */
8135 handle_vtv_comdat_section (section
*sect
, const_tree decl ATTRIBUTE_UNUSED
)
8137 #if defined (OBJECT_FORMAT_ELF)
8138 targetm
.asm_out
.named_section (sect
->named
.name
,
8139 sect
->named
.common
.flags
8144 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
8145 Therefore the following check is used.
8146 In case a the target is PE or COFF a comdat group section
8147 is created, e.g. .vtable_map_vars$foo. The linker places
8148 everything in .vtable_map_vars at the end.
8150 A fix could be made in
8151 gcc/config/i386/winnt.c: i386_pe_unique_section. */
8156 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
8157 name
= ACONCAT ((sect
->named
.name
, "$",
8158 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
8160 name
= ACONCAT ((sect
->named
.name
, "$",
8161 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
8164 targetm
.asm_out
.named_section (name
,
8165 sect
->named
.common
.flags
8171 switch_to_section (sect
);
8175 #include "gt-varasm.h"