1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 2010, 2011, 2012 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* This file handles generation of all the assembler code
24 *except* the instructions of a function.
25 This includes declarations of variables and their initial values.
27 We also output the assembler code for constants stored in memory
28 and are responsible for combining constants with the same value. */
32 #include "coretypes.h"
39 #include "hard-reg-set.h"
42 #include "diagnostic-core.h"
45 #include "langhooks.h"
49 #include "common/common-target.h"
50 #include "targhooks.h"
51 #include "tree-mudflap.h"
53 #include "pointer-set.h"
56 #ifdef XCOFF_DEBUGGING_INFO
57 #include "xcoffout.h" /* Needed for external data
58 declarations for e.g. AIX 4.x. */
61 /* The (assembler) name of the first globally-visible object output. */
62 extern GTY(()) const char *first_global_object_name
;
63 extern GTY(()) const char *weak_global_object_name
;
65 const char *first_global_object_name
;
66 const char *weak_global_object_name
;
69 struct constant_descriptor_rtx
;
70 struct rtx_constant_pool
;
72 #define n_deferred_constants (crtl->varasm.deferred_constants)
74 /* Number for making the label on the next
75 constant that is stored in memory. */
77 static GTY(()) int const_labelno
;
79 /* Carry information from ASM_DECLARE_OBJECT_NAME
80 to ASM_FINISH_DECLARE_OBJECT. */
82 int size_directive_output
;
84 /* The last decl for which assemble_variable was called,
85 if it did ASM_DECLARE_OBJECT_NAME.
86 If the last call to assemble_variable didn't do that,
89 tree last_assemble_variable_decl
;
91 /* The following global variable indicates if the first basic block
92 in a function belongs to the cold partition or not. */
94 bool first_function_block_is_cold
;
96 /* We give all constants their own alias set. Perhaps redundant with
97 MEM_READONLY_P, but pre-dates it. */
99 static alias_set_type const_alias_set
;
101 /* Whether we saw any functions with no_split_stack. */
103 static bool saw_no_split_stack
;
105 static const char *strip_reg_name (const char *);
106 static int contains_pointers_p (tree
);
107 #ifdef ASM_OUTPUT_EXTERNAL
108 static bool incorporeal_function_p (tree
);
110 static void decode_addr_const (tree
, struct addr_const
*);
111 static hashval_t
const_desc_hash (const void *);
112 static int const_desc_eq (const void *, const void *);
113 static hashval_t
const_hash_1 (const tree
);
114 static int compare_constant (const tree
, const tree
);
115 static tree
copy_constant (tree
);
116 static void output_constant_def_contents (rtx
);
117 static void output_addressed_constants (tree
);
118 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
119 static unsigned min_align (unsigned, unsigned);
120 static void globalize_decl (tree
);
121 static bool decl_readonly_section_1 (enum section_category
);
122 #ifdef BSS_SECTION_ASM_OP
123 #ifdef ASM_OUTPUT_ALIGNED_BSS
124 static void asm_output_aligned_bss (FILE *, tree
, const char *,
125 unsigned HOST_WIDE_INT
, int)
128 #endif /* BSS_SECTION_ASM_OP */
129 static void mark_weak (tree
);
130 static void output_constant_pool (const char *, tree
);
132 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
133 section
*text_section
;
134 section
*data_section
;
135 section
*readonly_data_section
;
136 section
*sdata_section
;
137 section
*ctors_section
;
138 section
*dtors_section
;
139 section
*bss_section
;
140 section
*sbss_section
;
142 /* Various forms of common section. All are guaranteed to be nonnull. */
143 section
*tls_comm_section
;
144 section
*comm_section
;
145 section
*lcomm_section
;
147 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
149 section
*bss_noswitch_section
;
151 /* The section that holds the main exception table, when known. The section
152 is set either by the target's init_sections hook or by the first call to
153 switch_to_exception_section. */
154 section
*exception_section
;
156 /* The section that holds the DWARF2 frame unwind information, when known.
157 The section is set either by the target's init_sections hook or by the
158 first call to switch_to_eh_frame_section. */
159 section
*eh_frame_section
;
161 /* asm_out_file's current section. This is NULL if no section has yet
162 been selected or if we lose track of what the current section is. */
165 /* True if code for the current function is currently being directed
166 at the cold section. */
167 bool in_cold_section_p
;
169 /* A linked list of all the unnamed sections. */
170 static GTY(()) section
*unnamed_sections
;
172 /* Return a nonzero value if DECL has a section attribute. */
173 #define IN_NAMED_SECTION(DECL) \
174 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
175 && DECL_SECTION_NAME (DECL) != NULL_TREE)
177 /* Hash table of named sections. */
178 static GTY((param_is (section
))) htab_t section_htab
;
180 /* A table of object_blocks, indexed by section. */
181 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
183 /* The next number to use for internal anchor labels. */
184 static GTY(()) int anchor_labelno
;
186 /* A pool of constants that can be shared between functions. */
187 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
189 /* Helper routines for maintaining section_htab. */
192 section_entry_eq (const void *p1
, const void *p2
)
194 const section
*old
= (const section
*) p1
;
195 const char *new_name
= (const char *) p2
;
197 return strcmp (old
->named
.name
, new_name
) == 0;
201 section_entry_hash (const void *p
)
203 const section
*old
= (const section
*) p
;
204 return htab_hash_string (old
->named
.name
);
207 /* Return a hash value for section SECT. */
210 hash_section (section
*sect
)
212 if (sect
->common
.flags
& SECTION_NAMED
)
213 return htab_hash_string (sect
->named
.name
);
214 return sect
->common
.flags
;
217 /* Helper routines for maintaining object_block_htab. */
220 object_block_entry_eq (const void *p1
, const void *p2
)
222 const struct object_block
*old
= (const struct object_block
*) p1
;
223 const section
*new_section
= (const section
*) p2
;
225 return old
->sect
== new_section
;
229 object_block_entry_hash (const void *p
)
231 const struct object_block
*old
= (const struct object_block
*) p
;
232 return hash_section (old
->sect
);
235 /* Return a new unnamed section with the given fields. */
238 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
243 sect
= ggc_alloc_section ();
244 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
245 sect
->unnamed
.callback
= callback
;
246 sect
->unnamed
.data
= data
;
247 sect
->unnamed
.next
= unnamed_sections
;
249 unnamed_sections
= sect
;
253 /* Return a SECTION_NOSWITCH section with the given fields. */
256 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
260 sect
= ggc_alloc_section ();
261 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
262 sect
->noswitch
.callback
= callback
;
267 /* Return the named section structure associated with NAME. Create
268 a new section with the given fields if no such structure exists. */
271 get_section (const char *name
, unsigned int flags
, tree decl
)
273 section
*sect
, **slot
;
276 htab_find_slot_with_hash (section_htab
, name
,
277 htab_hash_string (name
), INSERT
);
278 flags
|= SECTION_NAMED
;
281 sect
= ggc_alloc_section ();
282 sect
->named
.common
.flags
= flags
;
283 sect
->named
.name
= ggc_strdup (name
);
284 sect
->named
.decl
= decl
;
290 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
291 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
293 /* It is fine if one of the section flags is
294 SECTION_WRITE | SECTION_RELRO and the other has none of these
295 flags (i.e. read-only) in named sections and either the
296 section hasn't been declared yet or has been declared as writable.
297 In that case just make sure the resulting flags are
298 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
300 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
301 == (SECTION_WRITE
| SECTION_RELRO
)
302 && (sect
->common
.flags
303 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
304 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
305 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
306 || (sect
->common
.flags
& SECTION_WRITE
)))
308 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
311 /* Sanity check user variables for flag changes. */
313 decl
= sect
->named
.decl
;
315 if (sect
->named
.decl
== NULL
)
316 error ("%+D causes a section type conflict", decl
);
319 error ("%+D causes a section type conflict with %D",
320 decl
, sect
->named
.decl
);
321 if (decl
!= sect
->named
.decl
)
322 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
323 "%qD was declared here", sect
->named
.decl
);
325 /* Make sure we don't error about one section multiple times. */
326 sect
->common
.flags
|= SECTION_OVERRIDE
;
332 /* Return true if the current compilation mode benefits from having
333 objects grouped into blocks. */
336 use_object_blocks_p (void)
338 return flag_section_anchors
;
341 /* Return the object_block structure for section SECT. Create a new
342 structure if we haven't created one already. Return null if SECT
345 static struct object_block
*
346 get_block_for_section (section
*sect
)
348 struct object_block
*block
;
354 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
355 hash_section (sect
), INSERT
);
356 block
= (struct object_block
*) *slot
;
359 block
= ggc_alloc_cleared_object_block ();
366 /* Create a symbol with label LABEL and place it at byte offset
367 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
368 is not yet known. LABEL must be a garbage-collected string. */
371 create_block_symbol (const char *label
, struct object_block
*block
,
372 HOST_WIDE_INT offset
)
377 /* Create the extended SYMBOL_REF. */
378 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
379 symbol
= ggc_alloc_zone_rtx_def (size
, &rtl_zone
);
381 /* Initialize the normal SYMBOL_REF fields. */
382 memset (symbol
, 0, size
);
383 PUT_CODE (symbol
, SYMBOL_REF
);
384 PUT_MODE (symbol
, Pmode
);
385 XSTR (symbol
, 0) = label
;
386 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
388 /* Initialize the block_symbol stuff. */
389 SYMBOL_REF_BLOCK (symbol
) = block
;
390 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
395 /* Return a section with a particular name and with whatever SECTION_*
396 flags section_type_flags deems appropriate. The name of the section
397 is taken from NAME if nonnull, otherwise it is taken from DECL's
398 DECL_SECTION_NAME. DECL is the decl associated with the section
399 (see the section comment for details) and RELOC is as for
400 section_type_flags. */
403 get_named_section (tree decl
, const char *name
, int reloc
)
407 gcc_assert (!decl
|| DECL_P (decl
));
409 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
411 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
413 return get_section (name
, flags
, decl
);
416 /* If required, set DECL_SECTION_NAME to a unique name. */
419 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
420 int flag_function_or_data_sections
)
422 if (DECL_SECTION_NAME (decl
) == NULL_TREE
423 && targetm_common
.have_named_sections
424 && (flag_function_or_data_sections
425 || DECL_ONE_ONLY (decl
)))
427 targetm
.asm_out
.unique_section (decl
, reloc
);
428 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
) = true;
432 #ifdef BSS_SECTION_ASM_OP
434 #ifdef ASM_OUTPUT_ALIGNED_BSS
436 /* Utility function for targets to use in implementing
437 ASM_OUTPUT_ALIGNED_BSS.
438 ??? It is believed that this function will work in most cases so such
439 support is localized here. */
442 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
443 const char *name
, unsigned HOST_WIDE_INT size
,
446 switch_to_section (bss_section
);
447 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
448 #ifdef ASM_DECLARE_OBJECT_NAME
449 last_assemble_variable_decl
= decl
;
450 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
452 /* Standard thing is just output label for the object. */
453 ASM_OUTPUT_LABEL (file
, name
);
454 #endif /* ASM_DECLARE_OBJECT_NAME */
455 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
460 #endif /* BSS_SECTION_ASM_OP */
462 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
463 /* Return the hot section for function DECL. Return text_section for
467 hot_function_section (tree decl
)
469 if (decl
!= NULL_TREE
470 && DECL_SECTION_NAME (decl
) != NULL_TREE
471 && targetm_common
.have_named_sections
)
472 return get_named_section (decl
, NULL
, 0);
478 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
481 When DECL_SECTION_NAME is non-NULL and it is implicit section and
482 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
483 concatenate the name with NAMED_SECTION_SUFFIX.
484 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
487 get_named_text_section (tree decl
,
488 const char *text_section_name
,
489 const char *named_section_suffix
)
491 if (decl
&& DECL_SECTION_NAME (decl
))
493 if (named_section_suffix
)
495 tree dsn
= DECL_SECTION_NAME (decl
);
496 const char *stripped_name
;
499 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
500 memcpy (name
, TREE_STRING_POINTER (dsn
),
501 TREE_STRING_LENGTH (dsn
) + 1);
503 stripped_name
= targetm
.strip_name_encoding (name
);
505 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
506 return get_named_section (decl
, buffer
, 0);
508 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
512 /* Do not try to split gnu_linkonce functions. This gets somewhat
514 if (DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
)
516 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
517 name
= targetm
.strip_name_encoding (name
);
518 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
524 return get_named_section (decl
, text_section_name
, 0);
527 /* Choose named function section based on its frequency. */
530 default_function_section (tree decl
, enum node_frequency freq
,
531 bool startup
, bool exit
)
533 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
534 /* Old GNU linkers have buggy --gc-section support, which sometimes
535 results in .gcc_except_table* sections being garbage collected. */
537 && DECL_SECTION_NAME (decl
)
538 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
542 if (!flag_reorder_functions
543 || !targetm_common
.have_named_sections
)
545 /* Startup code should go to startup subsection unless it is
546 unlikely executed (this happens especially with function splitting
547 where we can split away unnecessary parts of static constructors. */
548 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
549 return get_named_text_section (decl
, ".text.startup", NULL
);
551 /* Similarly for exit. */
552 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
553 return get_named_text_section (decl
, ".text.exit", NULL
);
555 /* Group cold functions together, similarly for hot code. */
558 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
559 return get_named_text_section (decl
, ".text.unlikely", NULL
);
560 case NODE_FREQUENCY_HOT
:
561 return get_named_text_section (decl
, ".text.hot", NULL
);
567 /* Return the section for function DECL.
569 If DECL is NULL_TREE, return the text section. We can be passed
570 NULL_TREE under some circumstances by dbxout.c at least.
572 If FORCE_COLD is true, return cold function section ignoring
573 the frequency info of cgraph_node. */
576 function_section_1 (tree decl
, bool force_cold
)
578 section
*section
= NULL
;
579 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
580 bool startup
= false, exit
= false;
584 struct cgraph_node
*node
= cgraph_get_node (decl
);
588 freq
= node
->frequency
;
589 startup
= node
->only_called_at_startup
;
590 exit
= node
->only_called_at_exit
;
594 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
596 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
597 if (decl
!= NULL_TREE
598 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
600 if (targetm
.asm_out
.function_section
)
601 section
= targetm
.asm_out
.function_section (decl
, freq
,
605 return get_named_section (decl
, NULL
, 0);
608 return targetm
.asm_out
.select_section
609 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
612 if (targetm
.asm_out
.function_section
)
613 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
616 return hot_function_section (decl
);
620 /* Return the section for function DECL.
622 If DECL is NULL_TREE, return the text section. We can be passed
623 NULL_TREE under some circumstances by dbxout.c at least. */
626 function_section (tree decl
)
628 /* Handle cases where function splitting code decides
629 to put function entry point into unlikely executed section
630 despite the fact that the function itself is not cold
631 (i.e. it is called rarely but contains a hot loop that is
632 better to live in hot subsection for the code locality). */
633 return function_section_1 (decl
,
634 first_function_block_is_cold
);
637 /* Return the section for the current function, take IN_COLD_SECTION_P
641 current_function_section (void)
643 return function_section_1 (current_function_decl
, in_cold_section_p
);
646 /* Tell assembler to switch to unlikely-to-be-executed text section. */
649 unlikely_text_section (void)
651 return function_section_1 (current_function_decl
, true);
654 /* When called within a function context, return true if the function
655 has been assigned a cold text section and if SECT is that section.
656 When called outside a function context, return true if SECT is the
657 default cold section. */
660 unlikely_text_section_p (section
*sect
)
662 return sect
== function_section_1 (current_function_decl
, true);
665 /* Return the read-only data section associated with function DECL. */
668 default_function_rodata_section (tree decl
)
670 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
672 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
674 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
680 dot
= strchr (name
+ 1, '.');
683 len
= strlen (dot
) + 8;
684 rname
= (char *) alloca (len
);
686 strcpy (rname
, ".rodata");
688 return get_section (rname
, SECTION_LINKONCE
, decl
);
690 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
691 else if (DECL_ONE_ONLY (decl
)
692 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
694 size_t len
= strlen (name
) + 1;
695 char *rname
= (char *) alloca (len
);
697 memcpy (rname
, name
, len
);
699 return get_section (rname
, SECTION_LINKONCE
, decl
);
701 /* For .text.foo we want to use .rodata.foo. */
702 else if (flag_function_sections
&& flag_data_sections
703 && strncmp (name
, ".text.", 6) == 0)
705 size_t len
= strlen (name
) + 1;
706 char *rname
= (char *) alloca (len
+ 2);
708 memcpy (rname
, ".rodata", 7);
709 memcpy (rname
+ 7, name
+ 5, len
- 5);
710 return get_section (rname
, 0, decl
);
714 return readonly_data_section
;
717 /* Return the read-only data section associated with function DECL
718 for targets where that section should be always the single
719 readonly data section. */
722 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
724 return readonly_data_section
;
727 /* Return the section to use for string merging. */
730 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
731 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
732 unsigned int flags ATTRIBUTE_UNUSED
)
736 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
737 && TREE_CODE (decl
) == STRING_CST
738 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
740 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
741 && TREE_STRING_LENGTH (decl
) >= len
)
743 enum machine_mode mode
;
744 unsigned int modesize
;
748 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
749 char *name
= (char *) alloca (strlen (prefix
) + 30);
751 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
752 modesize
= GET_MODE_BITSIZE (mode
);
753 if (modesize
>= 8 && modesize
<= 256
754 && (modesize
& (modesize
- 1)) == 0)
756 if (align
< modesize
)
759 str
= TREE_STRING_POINTER (decl
);
760 unit
= GET_MODE_SIZE (mode
);
762 /* Check for embedded NUL characters. */
763 for (i
= 0; i
< len
; i
+= unit
)
765 for (j
= 0; j
< unit
; j
++)
766 if (str
[i
+ j
] != '\0')
773 sprintf (name
, "%s.str%d.%d", prefix
,
774 modesize
/ 8, (int) (align
/ 8));
775 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
776 return get_section (name
, flags
, NULL
);
781 return readonly_data_section
;
784 /* Return the section to use for constant merging. */
787 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
788 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
789 unsigned int flags ATTRIBUTE_UNUSED
)
791 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
793 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
799 && (align
& (align
- 1)) == 0)
801 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
802 char *name
= (char *) alloca (strlen (prefix
) + 30);
804 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
805 flags
|= (align
/ 8) | SECTION_MERGE
;
806 return get_section (name
, flags
, NULL
);
808 return readonly_data_section
;
811 /* Given NAME, a putative register name, discard any customary prefixes. */
814 strip_reg_name (const char *name
)
816 #ifdef REGISTER_PREFIX
817 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
818 name
+= strlen (REGISTER_PREFIX
);
820 if (name
[0] == '%' || name
[0] == '#')
825 /* The user has asked for a DECL to have a particular name. Set (or
826 change) it in such a way that we don't prefix an underscore to
829 set_user_assembler_name (tree decl
, const char *name
)
831 char *starred
= (char *) alloca (strlen (name
) + 2);
833 strcpy (starred
+ 1, name
);
834 change_decl_assembler_name (decl
, get_identifier (starred
));
835 SET_DECL_RTL (decl
, NULL_RTX
);
838 /* Decode an `asm' spec for a declaration as a register name.
839 Return the register number, or -1 if nothing specified,
840 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
841 or -3 if ASMSPEC is `cc' and is not recognized,
842 or -4 if ASMSPEC is `memory' and is not recognized.
843 Accept an exact spelling or a decimal number.
844 Prefixes such as % are optional. */
847 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
849 /* Presume just one register is clobbered. */
856 /* Get rid of confusing prefixes. */
857 asmspec
= strip_reg_name (asmspec
);
859 /* Allow a decimal number as a "register name". */
860 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
861 if (! ISDIGIT (asmspec
[i
]))
863 if (asmspec
[0] != 0 && i
< 0)
866 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
872 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
874 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
877 #ifdef OVERLAPPING_REGISTER_NAMES
881 const char *const name
;
884 } table
[] = OVERLAPPING_REGISTER_NAMES
;
886 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
888 && ! strcmp (asmspec
, table
[i
].name
))
890 *pnregs
= table
[i
].nregs
;
891 return table
[i
].number
;
894 #endif /* OVERLAPPING_REGISTER_NAMES */
896 #ifdef ADDITIONAL_REGISTER_NAMES
898 static const struct { const char *const name
; const int number
; } table
[]
899 = ADDITIONAL_REGISTER_NAMES
;
901 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
903 && ! strcmp (asmspec
, table
[i
].name
))
904 return table
[i
].number
;
906 #endif /* ADDITIONAL_REGISTER_NAMES */
908 if (!strcmp (asmspec
, "memory"))
911 if (!strcmp (asmspec
, "cc"))
921 decode_reg_name (const char *name
)
924 return decode_reg_name_and_count (name
, &count
);
928 /* Return true if DECL's initializer is suitable for a BSS section. */
931 bss_initializer_p (const_tree decl
)
933 return (DECL_INITIAL (decl
) == NULL
934 || DECL_INITIAL (decl
) == error_mark_node
935 || (flag_zero_initialized_in_bss
936 /* Leave constant zeroes in .rodata so they
938 && !TREE_READONLY (decl
)
939 && initializer_zerop (DECL_INITIAL (decl
))));
942 /* Compute the alignment of variable specified by DECL.
943 DONT_OUTPUT_DATA is from assemble_variable. */
946 align_variable (tree decl
, bool dont_output_data
)
948 unsigned int align
= DECL_ALIGN (decl
);
950 /* In the case for initialing an array whose length isn't specified,
951 where we have not yet been able to do the layout,
952 figure out the proper alignment now. */
953 if (dont_output_data
&& DECL_SIZE (decl
) == 0
954 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
955 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
957 /* Some object file formats have a maximum alignment which they support.
958 In particular, a.out format supports a maximum alignment of 4. */
959 if (align
> MAX_OFILE_ALIGNMENT
)
961 warning (0, "alignment of %q+D is greater than maximum object "
962 "file alignment. Using %d", decl
,
963 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
964 align
= MAX_OFILE_ALIGNMENT
;
967 /* On some machines, it is good to increase alignment sometimes. */
968 if (! DECL_USER_ALIGN (decl
))
970 #ifdef DATA_ALIGNMENT
971 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
972 /* Don't increase alignment too much for TLS variables - TLS space
974 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
977 #ifdef CONSTANT_ALIGNMENT
978 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
980 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
982 /* Don't increase alignment too much for TLS variables - TLS space
984 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
990 /* Reset the alignment in case we have made it tighter, so we can benefit
991 from it in get_pointer_alignment. */
992 DECL_ALIGN (decl
) = align
;
995 /* Return the section into which the given VAR_DECL or CONST_DECL
996 should be placed. PREFER_NOSWITCH_P is true if a noswitch
997 section should be used wherever possible. */
1000 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1002 addr_space_t as
= ADDR_SPACE_GENERIC
;
1005 if (TREE_TYPE (decl
) != error_mark_node
)
1006 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1008 if (DECL_COMMON (decl
))
1010 /* If the decl has been given an explicit section name, or it resides
1011 in a non-generic address space, then it isn't common, and shouldn't
1012 be handled as such. */
1013 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1014 && ADDR_SPACE_GENERIC_P (as
));
1015 if (DECL_THREAD_LOCAL_P (decl
))
1016 return tls_comm_section
;
1017 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1018 return comm_section
;
1021 if (DECL_INITIAL (decl
) == error_mark_node
)
1022 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1023 else if (DECL_INITIAL (decl
))
1024 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1028 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1029 if (IN_NAMED_SECTION (decl
))
1030 return get_named_section (decl
, NULL
, reloc
);
1032 if (ADDR_SPACE_GENERIC_P (as
)
1033 && !DECL_THREAD_LOCAL_P (decl
)
1034 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1035 && bss_initializer_p (decl
))
1037 if (!TREE_PUBLIC (decl
)
1038 && !(flag_asan
&& asan_protect_global (decl
)))
1039 return lcomm_section
;
1040 if (bss_noswitch_section
)
1041 return bss_noswitch_section
;
1044 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1047 /* Return the block into which object_block DECL should be placed. */
1049 static struct object_block
*
1050 get_block_for_decl (tree decl
)
1054 if (TREE_CODE (decl
) == VAR_DECL
)
1056 /* The object must be defined in this translation unit. */
1057 if (DECL_EXTERNAL (decl
))
1060 /* There's no point using object blocks for something that is
1061 isolated by definition. */
1062 if (DECL_ONE_ONLY (decl
))
1066 /* We can only calculate block offsets if the decl has a known
1068 if (DECL_SIZE_UNIT (decl
) == NULL
)
1070 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1073 /* Find out which section should contain DECL. We cannot put it into
1074 an object block if it requires a standalone definition. */
1075 if (TREE_CODE (decl
) == VAR_DECL
)
1076 align_variable (decl
, 0);
1077 sect
= get_variable_section (decl
, true);
1078 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1081 return get_block_for_section (sect
);
1084 /* Make sure block symbol SYMBOL is in block BLOCK. */
1087 change_symbol_block (rtx symbol
, struct object_block
*block
)
1089 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1091 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1092 SYMBOL_REF_BLOCK (symbol
) = block
;
1096 /* Return true if it is possible to put DECL in an object_block. */
1099 use_blocks_for_decl_p (tree decl
)
1101 /* Only data DECLs can be placed into object blocks. */
1102 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1105 /* Detect decls created by dw2_force_const_mem. Such decls are
1106 special because DECL_INITIAL doesn't specify the decl's true value.
1107 dw2_output_indirect_constants will instead call assemble_variable
1108 with dont_output_data set to 1 and then print the contents itself. */
1109 if (DECL_INITIAL (decl
) == decl
)
1112 /* If this decl is an alias, then we don't want to emit a
1114 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1117 return targetm
.use_blocks_for_decl_p (decl
);
1120 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1121 have static storage duration. In other words, it should not be an
1122 automatic variable, including PARM_DECLs.
1124 There is, however, one exception: this function handles variables
1125 explicitly placed in a particular register by the user.
1127 This is never called for PARM_DECL nodes. */
1130 make_decl_rtl (tree decl
)
1132 const char *name
= 0;
1136 /* Check that we are not being given an automatic variable. */
1137 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1138 && TREE_CODE (decl
) != RESULT_DECL
);
1140 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1141 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1142 || TREE_STATIC (decl
)
1143 || TREE_PUBLIC (decl
)
1144 || DECL_EXTERNAL (decl
)
1145 || DECL_REGISTER (decl
));
1147 /* And that we were not given a type or a label. */
1148 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1149 && TREE_CODE (decl
) != LABEL_DECL
);
1151 /* For a duplicate declaration, we can be called twice on the
1152 same DECL node. Don't discard the RTL already made. */
1153 if (DECL_RTL_SET_P (decl
))
1155 /* If the old RTL had the wrong mode, fix the mode. */
1156 x
= DECL_RTL (decl
);
1157 if (GET_MODE (x
) != DECL_MODE (decl
))
1158 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1160 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1163 /* ??? Another way to do this would be to maintain a hashed
1164 table of such critters. Instead of adding stuff to a DECL
1165 to give certain attributes to it, we could use an external
1166 hash map from DECL to set of attributes. */
1168 /* Let the target reassign the RTL if it wants.
1169 This is necessary, for example, when one machine specific
1170 decl attribute overrides another. */
1171 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1173 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1174 on the new decl information. */
1176 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1177 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1178 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1180 /* Make this function static known to the mudflap runtime. */
1181 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1182 mudflap_enqueue_decl (decl
);
1187 /* If this variable belongs to the global constant pool, retrieve the
1188 pre-computed RTL or recompute it in LTO mode. */
1189 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1191 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1195 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1197 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1198 && DECL_REGISTER (decl
))
1200 error ("register name not specified for %q+D", decl
);
1202 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1204 const char *asmspec
= name
+1;
1205 enum machine_mode mode
= DECL_MODE (decl
);
1206 reg_number
= decode_reg_name (asmspec
);
1207 /* First detect errors in declaring global registers. */
1208 if (reg_number
== -1)
1209 error ("register name not specified for %q+D", decl
);
1210 else if (reg_number
< 0)
1211 error ("invalid register name for %q+D", decl
);
1212 else if (mode
== BLKmode
)
1213 error ("data type of %q+D isn%'t suitable for a register",
1215 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1216 error ("the register specified for %q+D cannot be accessed"
1217 " by the current target", decl
);
1218 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1219 error ("the register specified for %q+D is not general enough"
1220 " to be used as a register variable", decl
);
1221 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1222 error ("register specified for %q+D isn%'t suitable for data type",
1224 /* Now handle properly declared static register variables. */
1229 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1231 DECL_INITIAL (decl
) = 0;
1232 error ("global register variable has initial value");
1234 if (TREE_THIS_VOLATILE (decl
))
1235 warning (OPT_Wvolatile_register_var
,
1236 "optimization may eliminate reads and/or "
1237 "writes to register variables");
1239 /* If the user specified one of the eliminables registers here,
1240 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1241 confused with that register and be eliminated. This usage is
1242 somewhat suspect... */
1244 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1245 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1246 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1248 if (TREE_STATIC (decl
))
1250 /* Make this register global, so not usable for anything
1252 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1253 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1254 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1256 nregs
= hard_regno_nregs
[reg_number
][mode
];
1258 globalize_reg (decl
, reg_number
+ --nregs
);
1261 /* As a register variable, it has no section. */
1265 /* Now handle ordinary static variables and functions (in memory).
1266 Also handle vars declared register invalidly. */
1267 else if (name
[0] == '*')
1269 #ifdef REGISTER_PREFIX
1270 if (strlen (REGISTER_PREFIX
) != 0)
1272 reg_number
= decode_reg_name (name
);
1273 if (reg_number
>= 0 || reg_number
== -3)
1274 error ("register name given for non-register variable %q+D", decl
);
1279 /* Specifying a section attribute on a variable forces it into a
1280 non-.bss section, and thus it cannot be common. */
1281 /* FIXME: In general this code should not be necessary because
1282 visibility pass is doing the same work. But notice_global_symbol
1283 is called early and it needs to make DECL_RTL to get the name.
1284 we take care of recomputing the DECL_RTL after visibility is changed. */
1285 if (TREE_CODE (decl
) == VAR_DECL
1286 && DECL_SECTION_NAME (decl
) != NULL_TREE
1287 && DECL_INITIAL (decl
) == NULL_TREE
1288 && DECL_COMMON (decl
))
1289 DECL_COMMON (decl
) = 0;
1291 /* Variables can't be both common and weak. */
1292 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1293 DECL_COMMON (decl
) = 0;
1295 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1296 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1299 enum machine_mode address_mode
= Pmode
;
1300 if (TREE_TYPE (decl
) != error_mark_node
)
1302 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1303 address_mode
= targetm
.addr_space
.address_mode (as
);
1305 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1307 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1308 SET_SYMBOL_REF_DECL (x
, decl
);
1310 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1311 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1312 set_mem_attributes (x
, decl
, 1);
1313 SET_DECL_RTL (decl
, x
);
1315 /* Optionally set flags or add text to the name to record information
1316 such as that it is a function name.
1317 If the name is changed, the macro ASM_OUTPUT_LABELREF
1318 will have to know how to strip this information. */
1319 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1321 /* Make this function static known to the mudflap runtime. */
1322 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1323 mudflap_enqueue_decl (decl
);
1326 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1327 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1331 make_decl_rtl_for_debug (tree decl
)
1333 unsigned int save_aliasing_flag
, save_mudflap_flag
;
1336 if (DECL_RTL_SET_P (decl
))
1337 return DECL_RTL (decl
);
1339 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1340 call new_alias_set. If running with -fcompare-debug, sometimes
1341 we do not want to create alias sets that will throw the alias
1342 numbers off in the comparison dumps. So... clearing
1343 flag_strict_aliasing will keep new_alias_set() from creating a
1344 new set. It is undesirable to register decl with mudflap
1345 in this case as well. */
1346 save_aliasing_flag
= flag_strict_aliasing
;
1347 flag_strict_aliasing
= 0;
1348 save_mudflap_flag
= flag_mudflap
;
1351 rtl
= DECL_RTL (decl
);
1352 /* Reset DECL_RTL back, as various parts of the compiler expects
1353 DECL_RTL set meaning it is actually going to be output. */
1354 SET_DECL_RTL (decl
, NULL
);
1356 flag_strict_aliasing
= save_aliasing_flag
;
1357 flag_mudflap
= save_mudflap_flag
;
1362 /* Output a string of literal assembler code
1363 for an `asm' keyword used between functions. */
1366 assemble_asm (tree string
)
1371 if (TREE_CODE (string
) == ADDR_EXPR
)
1372 string
= TREE_OPERAND (string
, 0);
1374 p
= TREE_STRING_POINTER (string
);
1375 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1378 /* Write the address of the entity given by SYMBOL to SEC. */
1380 assemble_addr_to_section (rtx symbol
, section
*sec
)
1382 switch_to_section (sec
);
1383 assemble_align (POINTER_SIZE
);
1384 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1387 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1388 not) section for PRIORITY. */
1390 get_cdtor_priority_section (int priority
, bool constructor_p
)
1394 /* ??? This only works reliably with the GNU linker. */
1395 sprintf (buf
, "%s.%.5u",
1396 constructor_p
? ".ctors" : ".dtors",
1397 /* Invert the numbering so the linker puts us in the proper
1398 order; constructors are run from right to left, and the
1399 linker sorts in increasing order. */
1400 MAX_INIT_PRIORITY
- priority
);
1401 return get_section (buf
, SECTION_WRITE
, NULL
);
1405 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1409 if (priority
!= DEFAULT_INIT_PRIORITY
)
1410 sec
= get_cdtor_priority_section (priority
,
1411 /*constructor_p=*/false);
1413 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1415 assemble_addr_to_section (symbol
, sec
);
1418 #ifdef DTORS_SECTION_ASM_OP
1420 default_dtor_section_asm_out_destructor (rtx symbol
,
1421 int priority ATTRIBUTE_UNUSED
)
1423 assemble_addr_to_section (symbol
, dtors_section
);
1428 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1432 if (priority
!= DEFAULT_INIT_PRIORITY
)
1433 sec
= get_cdtor_priority_section (priority
,
1434 /*constructor_p=*/true);
1436 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1438 assemble_addr_to_section (symbol
, sec
);
1441 #ifdef CTORS_SECTION_ASM_OP
1443 default_ctor_section_asm_out_constructor (rtx symbol
,
1444 int priority ATTRIBUTE_UNUSED
)
1446 assemble_addr_to_section (symbol
, ctors_section
);
1450 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1451 a nonzero value if the constant pool should be output before the
1452 start of the function, or a zero value if the pool should output
1453 after the end of the function. The default is to put it before the
1456 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1457 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1460 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1461 to be output to assembler.
1462 Set first_global_object_name and weak_global_object_name as appropriate. */
1465 notice_global_symbol (tree decl
)
1467 const char **type
= &first_global_object_name
;
1469 if (first_global_object_name
1470 || !TREE_PUBLIC (decl
)
1471 || DECL_EXTERNAL (decl
)
1472 || !DECL_NAME (decl
)
1473 || (TREE_CODE (decl
) != FUNCTION_DECL
1474 && (TREE_CODE (decl
) != VAR_DECL
1475 || (DECL_COMMON (decl
)
1476 && (DECL_INITIAL (decl
) == 0
1477 || DECL_INITIAL (decl
) == error_mark_node
))))
1478 || !MEM_P (DECL_RTL (decl
)))
1481 /* We win when global object is found, but it is useful to know about weak
1482 symbol as well so we can produce nicer unique names. */
1483 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1484 type
= &weak_global_object_name
;
1490 rtx decl_rtl
= DECL_RTL (decl
);
1492 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1493 name
= ggc_strdup (p
);
1499 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1500 current function goes into the cold section, so that targets can use
1501 current_function_section during RTL expansion. DECL describes the
1505 decide_function_section (tree decl
)
1507 first_function_block_is_cold
= false;
1509 if (flag_reorder_blocks_and_partition
)
1510 /* We will decide in assemble_start_function. */
1513 if (DECL_SECTION_NAME (decl
))
1515 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1516 /* Calls to function_section rely on first_function_block_is_cold
1518 first_function_block_is_cold
= (node
1520 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1523 in_cold_section_p
= first_function_block_is_cold
;
1526 /* Output assembler code for the constant pool of a function and associated
1527 with defining the name of the function. DECL describes the function.
1528 NAME is the function's name. For the constant pool, we use the current
1529 constant pool data. */
1532 assemble_start_function (tree decl
, const char *fnname
)
1535 char tmp_label
[100];
1536 bool hot_label_written
= false;
1538 if (flag_reorder_blocks_and_partition
)
1540 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1541 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1542 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1543 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1544 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1545 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1546 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1547 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1552 crtl
->subsections
.hot_section_label
= NULL
;
1553 crtl
->subsections
.cold_section_label
= NULL
;
1554 crtl
->subsections
.hot_section_end_label
= NULL
;
1555 crtl
->subsections
.cold_section_end_label
= NULL
;
1558 /* The following code does not need preprocessing in the assembler. */
1562 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1563 output_constant_pool (fnname
, decl
);
1565 /* Make sure the not and cold text (code) sections are properly
1566 aligned. This is necessary here in the case where the function
1567 has both hot and cold sections, because we don't want to re-set
1568 the alignment when the section switch happens mid-function. */
1570 if (flag_reorder_blocks_and_partition
)
1572 first_function_block_is_cold
= false;
1574 switch_to_section (unlikely_text_section ());
1575 assemble_align (DECL_ALIGN (decl
));
1576 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1578 /* When the function starts with a cold section, we need to explicitly
1579 align the hot section and write out the hot section label.
1580 But if the current function is a thunk, we do not have a CFG. */
1582 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1584 switch_to_section (text_section
);
1585 assemble_align (DECL_ALIGN (decl
));
1586 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1587 hot_label_written
= true;
1588 first_function_block_is_cold
= true;
1590 in_cold_section_p
= first_function_block_is_cold
;
1594 /* Switch to the correct text section for the start of the function. */
1596 switch_to_section (function_section (decl
));
1597 if (flag_reorder_blocks_and_partition
1598 && !hot_label_written
)
1599 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1601 /* Tell assembler to move to target machine's alignment for functions. */
1602 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1605 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1608 /* Handle a user-specified function alignment.
1609 Note that we still need to align to DECL_ALIGN, as above,
1610 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1611 if (! DECL_USER_ALIGN (decl
)
1612 && align_functions_log
> align
1613 && optimize_function_for_speed_p (cfun
))
1615 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1616 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1617 align_functions_log
, align_functions
- 1);
1619 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1623 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1624 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1627 if (!DECL_IGNORED_P (decl
))
1628 (*debug_hooks
->begin_function
) (decl
);
1630 /* Make function name accessible from other files, if appropriate. */
1632 if (TREE_PUBLIC (decl
))
1634 notice_global_symbol (decl
);
1636 globalize_decl (decl
);
1638 maybe_assemble_visibility (decl
);
1641 if (DECL_PRESERVE_P (decl
))
1642 targetm
.asm_out
.mark_decl_preserved (fnname
);
1644 /* Do any machine/system dependent processing of the function name. */
1645 #ifdef ASM_DECLARE_FUNCTION_NAME
1646 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1648 /* Standard thing is just output label for the function. */
1649 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1650 #endif /* ASM_DECLARE_FUNCTION_NAME */
1652 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1653 saw_no_split_stack
= true;
1656 /* Output assembler code associated with defining the size of the
1657 function. DECL describes the function. NAME is the function's name. */
1660 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1662 #ifdef ASM_DECLARE_FUNCTION_SIZE
1663 /* We could have switched section in the middle of the function. */
1664 if (flag_reorder_blocks_and_partition
)
1665 switch_to_section (function_section (decl
));
1666 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1668 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1670 output_constant_pool (fnname
, decl
);
1671 switch_to_section (function_section (decl
)); /* need to switch back */
1673 /* Output labels for end of hot/cold text sections (to be used by
1675 if (flag_reorder_blocks_and_partition
)
1677 section
*save_text_section
;
1679 save_text_section
= in_section
;
1680 switch_to_section (unlikely_text_section ());
1681 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1682 if (first_function_block_is_cold
)
1683 switch_to_section (text_section
);
1685 switch_to_section (function_section (decl
));
1686 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1687 switch_to_section (save_text_section
);
1691 /* Assemble code to leave SIZE bytes of zeros. */
1694 assemble_zeros (unsigned HOST_WIDE_INT size
)
1696 /* Do no output if -fsyntax-only. */
1697 if (flag_syntax_only
)
1700 #ifdef ASM_NO_SKIP_IN_TEXT
1701 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1702 so we must output 0s explicitly in the text section. */
1703 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1705 unsigned HOST_WIDE_INT i
;
1706 for (i
= 0; i
< size
; i
++)
1707 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1712 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1715 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1718 assemble_align (int align
)
1720 if (align
> BITS_PER_UNIT
)
1722 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1726 /* Assemble a string constant with the specified C string as contents. */
1729 assemble_string (const char *p
, int size
)
1734 /* If the string is very long, split it up. */
1738 int thissize
= size
- pos
;
1739 if (thissize
> maximum
)
1742 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1750 /* A noswitch_section_callback for lcomm_section. */
1753 emit_local (tree decl ATTRIBUTE_UNUSED
,
1754 const char *name ATTRIBUTE_UNUSED
,
1755 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1756 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1758 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1759 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1760 size
, DECL_ALIGN (decl
));
1762 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1763 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1766 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1771 /* A noswitch_section_callback for bss_noswitch_section. */
1773 #if defined ASM_OUTPUT_ALIGNED_BSS
1775 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1776 const char *name ATTRIBUTE_UNUSED
,
1777 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1778 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1780 #if defined ASM_OUTPUT_ALIGNED_BSS
1781 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1787 /* A noswitch_section_callback for comm_section. */
1790 emit_common (tree decl ATTRIBUTE_UNUSED
,
1791 const char *name ATTRIBUTE_UNUSED
,
1792 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1793 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1795 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1796 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1797 size
, DECL_ALIGN (decl
));
1799 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1800 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1803 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1808 /* A noswitch_section_callback for tls_comm_section. */
1811 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1812 const char *name ATTRIBUTE_UNUSED
,
1813 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1814 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1816 #ifdef ASM_OUTPUT_TLS_COMMON
1817 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1820 sorry ("thread-local COMMON data not implemented");
1825 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1826 NAME is the name of DECL's SYMBOL_REF. */
1829 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1831 unsigned HOST_WIDE_INT size
, rounded
;
1833 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1836 if (flag_asan
&& asan_protect_global (decl
))
1837 size
+= asan_red_zone_size (size
);
1839 /* Don't allocate zero bytes of common,
1840 since that means "undefined external" in the linker. */
1844 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1845 so that each uninitialized object starts on such a boundary. */
1846 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1847 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1848 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1850 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1851 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1852 warning (0, "requested alignment for %q+D is greater than "
1853 "implemented alignment of %wu", decl
, rounded
);
1856 /* A subroutine of assemble_variable. Output the label and contents of
1857 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1858 is as for assemble_variable. */
1861 assemble_variable_contents (tree decl
, const char *name
,
1862 bool dont_output_data
)
1864 /* Do any machine/system dependent processing of the object. */
1865 #ifdef ASM_DECLARE_OBJECT_NAME
1866 last_assemble_variable_decl
= decl
;
1867 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1869 /* Standard thing is just output label for the object. */
1870 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1871 #endif /* ASM_DECLARE_OBJECT_NAME */
1873 if (!dont_output_data
)
1875 if (DECL_INITIAL (decl
)
1876 && DECL_INITIAL (decl
) != error_mark_node
1877 && !initializer_zerop (DECL_INITIAL (decl
)))
1878 /* Output the actual data. */
1879 output_constant (DECL_INITIAL (decl
),
1880 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1883 /* Leave space for it. */
1884 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1888 /* Assemble everything that is needed for a variable or function declaration.
1889 Not used for automatic variables, and not used for function definitions.
1890 Should not be called for variables of incomplete structure type.
1892 TOP_LEVEL is nonzero if this variable has file scope.
1893 AT_END is nonzero if this is the special handling, at end of compilation,
1894 to define things that have had only tentative definitions.
1895 DONT_OUTPUT_DATA if nonzero means don't actually output the
1896 initial value (that will be done by the caller). */
1899 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1900 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1903 rtx decl_rtl
, symbol
;
1905 bool asan_protected
= false;
1907 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1908 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1910 /* Emulated TLS had better not get this far. */
1911 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1913 last_assemble_variable_decl
= 0;
1915 /* Normally no need to say anything here for external references,
1916 since assemble_external is called by the language-specific code
1917 when a declaration is first seen. */
1919 if (DECL_EXTERNAL (decl
))
1922 /* Do nothing for global register variables. */
1923 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1925 TREE_ASM_WRITTEN (decl
) = 1;
1929 /* If type was incomplete when the variable was declared,
1930 see if it is complete now. */
1932 if (DECL_SIZE (decl
) == 0)
1933 layout_decl (decl
, 0);
1935 /* Still incomplete => don't allocate it; treat the tentative defn
1936 (which is what it must have been) as an `extern' reference. */
1938 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
1940 error ("storage size of %q+D isn%'t known", decl
);
1941 TREE_ASM_WRITTEN (decl
) = 1;
1945 /* The first declaration of a variable that comes through this function
1946 decides whether it is global (in C, has external linkage)
1947 or local (in C, has internal linkage). So do nothing more
1948 if this function has already run. */
1950 if (TREE_ASM_WRITTEN (decl
))
1953 /* Make sure targetm.encode_section_info is invoked before we set
1955 decl_rtl
= DECL_RTL (decl
);
1957 TREE_ASM_WRITTEN (decl
) = 1;
1959 /* Do no output if -fsyntax-only. */
1960 if (flag_syntax_only
)
1963 if (! dont_output_data
1964 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
1966 error ("size of variable %q+D is too large", decl
);
1970 gcc_assert (MEM_P (decl_rtl
));
1971 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
1972 symbol
= XEXP (decl_rtl
, 0);
1974 /* If this symbol belongs to the tree constant pool, output the constant
1975 if it hasn't already been written. */
1976 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
1978 tree decl
= SYMBOL_REF_DECL (symbol
);
1979 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
1980 output_constant_def_contents (symbol
);
1986 name
= XSTR (symbol
, 0);
1987 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
1988 notice_global_symbol (decl
);
1990 /* Compute the alignment of this data. */
1992 align_variable (decl
, dont_output_data
);
1995 && asan_protect_global (decl
))
1997 asan_protected
= true;
1998 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
1999 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2002 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2004 if (TREE_PUBLIC (decl
))
2005 maybe_assemble_visibility (decl
);
2007 if (DECL_PRESERVE_P (decl
))
2008 targetm
.asm_out
.mark_decl_preserved (name
);
2010 /* First make the assembler name(s) global if appropriate. */
2011 sect
= get_variable_section (decl
, false);
2012 if (TREE_PUBLIC (decl
)
2013 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2014 globalize_decl (decl
);
2016 /* Output any data that we will need to use the address of. */
2017 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2018 output_addressed_constants (DECL_INITIAL (decl
));
2020 /* dbxout.c needs to know this. */
2021 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2022 DECL_IN_TEXT_SECTION (decl
) = 1;
2024 /* If the decl is part of an object_block, make sure that the decl
2025 has been positioned within its block, but do not write out its
2026 definition yet. output_object_blocks will do that later. */
2027 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2029 gcc_assert (!dont_output_data
);
2030 place_block_symbol (symbol
);
2032 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2033 assemble_noswitch_variable (decl
, name
, sect
);
2036 switch_to_section (sect
);
2037 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2038 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2039 assemble_variable_contents (decl
, name
, dont_output_data
);
2042 unsigned HOST_WIDE_INT
int size
2043 = tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
2044 assemble_zeros (asan_red_zone_size (size
));
2049 /* Return 1 if type TYPE contains any pointers. */
2052 contains_pointers_p (tree type
)
2054 switch (TREE_CODE (type
))
2057 case REFERENCE_TYPE
:
2058 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2059 so I'll play safe and return 1. */
2065 case QUAL_UNION_TYPE
:
2068 /* For a type that has fields, see if the fields have pointers. */
2069 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2070 if (TREE_CODE (fields
) == FIELD_DECL
2071 && contains_pointers_p (TREE_TYPE (fields
)))
2077 /* An array type contains pointers if its element type does. */
2078 return contains_pointers_p (TREE_TYPE (type
));
2085 /* We delay assemble_external processing until
2086 the compilation unit is finalized. This is the best we can do for
2087 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2088 it all the way to final. See PR 17982 for further discussion. */
2089 static GTY(()) tree pending_assemble_externals
;
2091 #ifdef ASM_OUTPUT_EXTERNAL
2092 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2093 TREE_LIST in assemble_external. */
2094 static struct pointer_set_t
*pending_assemble_externals_set
;
2096 /* True if DECL is a function decl for which no out-of-line copy exists.
2097 It is assumed that DECL's assembler name has been set. */
2100 incorporeal_function_p (tree decl
)
2102 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2106 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2107 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2108 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2111 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2112 /* Atomic or sync builtins which have survived this far will be
2113 resolved externally and therefore are not incorporeal. */
2114 if (strncmp (name
, "__builtin_", 10) == 0)
2120 /* Actually do the tests to determine if this is necessary, and invoke
2121 ASM_OUTPUT_EXTERNAL. */
2123 assemble_external_real (tree decl
)
2125 rtx rtl
= DECL_RTL (decl
);
2127 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2128 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2129 && !incorporeal_function_p (decl
))
2131 /* Some systems do require some output. */
2132 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2133 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2139 process_pending_assemble_externals (void)
2141 #ifdef ASM_OUTPUT_EXTERNAL
2143 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2144 assemble_external_real (TREE_VALUE (list
));
2146 pending_assemble_externals
= 0;
2147 pointer_set_destroy (pending_assemble_externals_set
);
2151 /* This TREE_LIST contains any weak symbol declarations waiting
2153 static GTY(()) tree weak_decls
;
2155 /* Output something to declare an external symbol to the assembler,
2156 and qualifiers such as weakness. (Most assemblers don't need
2157 extern declaration, so we normally output nothing.) Do nothing if
2158 DECL is not external. */
2161 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2163 /* Make sure that the ASM_OUT_FILE is open.
2164 If it's not, we should not be calling this function. */
2165 gcc_assert (asm_out_file
);
2167 /* In a perfect world, the following condition would be true.
2168 Sadly, the Java and Go front ends emit assembly *from the front end*,
2169 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2171 /* This function should only be called if we are expanding, or have
2173 Ideally, only final.c would be calling this function, but it is
2174 not clear whether that would break things somehow. See PR 17982
2175 for further discussion. */
2176 gcc_assert (cgraph_state
== CGRAPH_STATE_EXPANSION
2177 || cgraph_state
== CGRAPH_STATE_FINISHED
);
2180 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2183 /* We want to output annotation for weak and external symbols at
2184 very last to check if they are references or not. */
2186 if (TARGET_SUPPORTS_WEAK
2188 /* TREE_STATIC is a weird and abused creature which is not
2189 generally the right test for whether an entity has been
2190 locally emitted, inlined or otherwise not-really-extern, but
2191 for declarations that can be weak, it happens to be
2193 && !TREE_STATIC (decl
)
2194 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2195 && value_member (decl
, weak_decls
) == NULL_TREE
)
2196 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2198 #ifdef ASM_OUTPUT_EXTERNAL
2199 if (! pointer_set_insert (pending_assemble_externals_set
, decl
))
2200 pending_assemble_externals
= tree_cons (NULL
, decl
,
2201 pending_assemble_externals
);
2205 /* Similar, for calling a library function FUN. */
2208 assemble_external_libcall (rtx fun
)
2210 /* Declare library function name external when first used, if nec. */
2211 if (! SYMBOL_REF_USED (fun
))
2213 SYMBOL_REF_USED (fun
) = 1;
2214 targetm
.asm_out
.external_libcall (fun
);
2218 /* Assemble a label named NAME. */
2221 assemble_label (FILE *file
, const char *name
)
2223 ASM_OUTPUT_LABEL (file
, name
);
2226 /* Set the symbol_referenced flag for ID. */
2228 mark_referenced (tree id
)
2230 TREE_SYMBOL_REFERENCED (id
) = 1;
2233 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2235 mark_decl_referenced (tree decl
)
2237 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2239 /* Extern inline functions don't become needed when referenced.
2240 If we know a method will be emitted in other TU and no new
2241 functions can be marked reachable, just use the external
2243 struct cgraph_node
*node
= cgraph_get_create_node (decl
);
2244 if (!DECL_EXTERNAL (decl
)
2245 && !node
->local
.finalized
)
2246 cgraph_mark_force_output_node (node
);
2248 else if (TREE_CODE (decl
) == VAR_DECL
)
2250 struct varpool_node
*node
= varpool_node_for_decl (decl
);
2251 /* C++ frontend use mark_decl_references to force COMDAT variables
2252 to be output that might appear dead otherwise. */
2253 node
->symbol
.force_output
= true;
2255 /* else do nothing - we can get various sorts of CST nodes here,
2256 which do not need to be marked. */
2260 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2261 until we find an identifier that is not itself a transparent alias.
2262 Modify the alias passed to it by reference (and all aliases on the
2263 way to the ultimate target), such that they do not have to be
2264 followed again, and return the ultimate target of the alias
2268 ultimate_transparent_alias_target (tree
*alias
)
2270 tree target
= *alias
;
2272 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2274 gcc_assert (TREE_CHAIN (target
));
2275 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2276 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2277 && ! TREE_CHAIN (target
));
2284 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2285 starts with a *, the rest of NAME is output verbatim. Otherwise
2286 NAME is transformed in a target-specific way (usually by the
2287 addition of an underscore). */
2290 assemble_name_raw (FILE *file
, const char *name
)
2293 fputs (&name
[1], file
);
2295 ASM_OUTPUT_LABELREF (file
, name
);
2298 /* Like assemble_name_raw, but should be used when NAME might refer to
2299 an entity that is also represented as a tree (like a function or
2300 variable). If NAME does refer to such an entity, that entity will
2301 be marked as referenced. */
2304 assemble_name (FILE *file
, const char *name
)
2306 const char *real_name
;
2309 real_name
= targetm
.strip_name_encoding (name
);
2311 id
= maybe_get_identifier (real_name
);
2316 mark_referenced (id
);
2317 ultimate_transparent_alias_target (&id
);
2319 name
= IDENTIFIER_POINTER (id
);
2320 gcc_assert (! TREE_CHAIN (id
));
2323 assemble_name_raw (file
, name
);
2326 /* Allocate SIZE bytes writable static space with a gensym name
2327 and return an RTX to refer to its address. */
2330 assemble_static_space (unsigned HOST_WIDE_INT size
)
2333 const char *namestring
;
2336 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2338 namestring
= ggc_strdup (name
);
2340 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2341 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2343 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2344 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2347 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2348 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2351 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2352 so that each uninitialized object starts on such a boundary. */
2353 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2354 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2355 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2356 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2357 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2358 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2365 /* Assemble the static constant template for function entry trampolines.
2366 This is done at most once per compilation.
2367 Returns an RTX for the address of the template. */
2369 static GTY(()) rtx initial_trampoline
;
2372 assemble_trampoline_template (void)
2379 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2381 if (initial_trampoline
)
2382 return initial_trampoline
;
2384 /* By default, put trampoline templates in read-only data section. */
2386 #ifdef TRAMPOLINE_SECTION
2387 switch_to_section (TRAMPOLINE_SECTION
);
2389 switch_to_section (readonly_data_section
);
2392 /* Write the assembler code to define one. */
2393 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2395 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2397 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2398 targetm
.asm_out
.trampoline_template (asm_out_file
);
2400 /* Record the rtl to refer to it. */
2401 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2402 name
= ggc_strdup (label
);
2403 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2404 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2406 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2407 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2408 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2410 return initial_trampoline
;
2413 /* A and B are either alignments or offsets. Return the minimum alignment
2414 that may be assumed after adding the two together. */
2416 static inline unsigned
2417 min_align (unsigned int a
, unsigned int b
)
2419 return (a
| b
) & -(a
| b
);
2422 /* Return the assembler directive for creating a given kind of integer
2423 object. SIZE is the number of bytes in the object and ALIGNED_P
2424 indicates whether it is known to be aligned. Return NULL if the
2425 assembly dialect has no such directive.
2427 The returned string should be printed at the start of a new line and
2428 be followed immediately by the object's initial value. */
2431 integer_asm_op (int size
, int aligned_p
)
2433 struct asm_int_op
*ops
;
2436 ops
= &targetm
.asm_out
.aligned_op
;
2438 ops
= &targetm
.asm_out
.unaligned_op
;
2443 return targetm
.asm_out
.byte_op
;
2457 /* Use directive OP to assemble an integer object X. Print OP at the
2458 start of the line, followed immediately by the value of X. */
2461 assemble_integer_with_op (const char *op
, rtx x
)
2463 fputs (op
, asm_out_file
);
2464 output_addr_const (asm_out_file
, x
);
2465 fputc ('\n', asm_out_file
);
2468 /* The default implementation of the asm_out.integer target hook. */
2471 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2472 unsigned int size ATTRIBUTE_UNUSED
,
2473 int aligned_p ATTRIBUTE_UNUSED
)
2475 const char *op
= integer_asm_op (size
, aligned_p
);
2476 /* Avoid GAS bugs for large values. Specifically negative values whose
2477 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2478 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2480 return op
&& (assemble_integer_with_op (op
, x
), true);
2483 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2484 the alignment of the integer in bits. Return 1 if we were able to output
2485 the constant, otherwise 0. We must be able to output the constant,
2486 if FORCE is nonzero. */
2489 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2493 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2495 /* See if the target hook can handle this kind of object. */
2496 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2499 /* If the object is a multi-byte one, try splitting it up. Split
2500 it into words it if is multi-word, otherwise split it into bytes. */
2503 enum machine_mode omode
, imode
;
2504 unsigned int subalign
;
2505 unsigned int subsize
, i
;
2506 enum mode_class mclass
;
2508 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2509 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2510 if (GET_CODE (x
) == CONST_FIXED
)
2511 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2515 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2516 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2518 for (i
= 0; i
< size
; i
+= subsize
)
2520 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2521 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2527 /* If we've printed some of it, but not all of it, there's no going
2532 gcc_assert (!force
);
2538 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2540 long data
[4] = {0, 0, 0, 0};
2542 int bitsize
, nelts
, nunits
, units_per
;
2544 /* This is hairy. We have a quantity of known size. real_to_target
2545 will put it into an array of *host* longs, 32 bits per element
2546 (even if long is more than 32 bits). We need to determine the
2547 number of array elements that are occupied (nelts) and the number
2548 of *target* min-addressable units that will be occupied in the
2549 object file (nunits). We cannot assume that 32 divides the
2550 mode's bitsize (size * BITS_PER_UNIT) evenly.
2552 size * BITS_PER_UNIT is used here to make sure that padding bits
2553 (which might appear at either end of the value; real_to_target
2554 will include the padding bits in its output array) are included. */
2556 nunits
= GET_MODE_SIZE (mode
);
2557 bitsize
= nunits
* BITS_PER_UNIT
;
2558 nelts
= CEIL (bitsize
, 32);
2559 units_per
= 32 / BITS_PER_UNIT
;
2561 real_to_target (data
, &d
, mode
);
2563 /* Put out the first word with the specified alignment. */
2564 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2565 nunits
-= units_per
;
2567 /* Subsequent words need only 32-bit alignment. */
2568 align
= min_align (align
, 32);
2570 for (i
= 1; i
< nelts
; i
++)
2572 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2573 nunits
-= units_per
;
2577 /* Given an expression EXP with a constant value,
2578 reduce it to the sum of an assembler symbol and an integer.
2579 Store them both in the structure *VALUE.
2580 EXP must be reducible. */
2584 HOST_WIDE_INT offset
;
2588 decode_addr_const (tree exp
, struct addr_const
*value
)
2590 tree target
= TREE_OPERAND (exp
, 0);
2596 if (TREE_CODE (target
) == COMPONENT_REF
2597 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2599 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2600 target
= TREE_OPERAND (target
, 0);
2602 else if (TREE_CODE (target
) == ARRAY_REF
2603 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2605 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2606 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2607 target
= TREE_OPERAND (target
, 0);
2609 else if (TREE_CODE (target
) == MEM_REF
2610 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2612 offset
+= mem_ref_offset (target
).low
;
2613 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2615 else if (TREE_CODE (target
) == INDIRECT_REF
2616 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2617 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2619 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2624 switch (TREE_CODE (target
))
2628 x
= DECL_RTL (target
);
2632 x
= gen_rtx_MEM (FUNCTION_MODE
,
2633 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2642 x
= output_constant_def (target
, 1);
2649 gcc_assert (MEM_P (x
));
2653 value
->offset
= offset
;
2657 static GTY((param_is (struct constant_descriptor_tree
)))
2658 htab_t const_desc_htab
;
2660 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2662 /* Constant pool accessor function. */
2665 constant_pool_htab (void)
2667 return const_desc_htab
;
2670 /* Compute a hash code for a constant expression. */
2673 const_desc_hash (const void *ptr
)
2675 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2679 const_hash_1 (const tree exp
)
2684 enum tree_code code
= TREE_CODE (exp
);
2686 /* Either set P and LEN to the address and len of something to hash and
2687 exit the switch or return a value. */
2692 p
= (char *) &TREE_INT_CST (exp
);
2693 len
= sizeof TREE_INT_CST (exp
);
2697 return real_hash (TREE_REAL_CST_PTR (exp
));
2700 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2703 p
= TREE_STRING_POINTER (exp
);
2704 len
= TREE_STRING_LENGTH (exp
);
2708 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2709 + const_hash_1 (TREE_IMAGPART (exp
)));
2715 hi
= 7 + VECTOR_CST_NELTS (exp
);
2717 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2718 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2725 unsigned HOST_WIDE_INT idx
;
2728 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2730 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2732 hi
= hi
* 603 + const_hash_1 (value
);
2740 struct addr_const value
;
2742 decode_addr_const (exp
, &value
);
2743 switch (GET_CODE (value
.base
))
2746 /* Don't hash the address of the SYMBOL_REF;
2747 only use the offset and the symbol name. */
2749 p
= XSTR (value
.base
, 0);
2750 for (i
= 0; p
[i
] != 0; i
++)
2751 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2755 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2765 case POINTER_PLUS_EXPR
:
2767 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2768 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2771 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2774 /* A language specific constant. Just hash the code. */
2778 /* Compute hashing function. */
2780 for (i
= 0; i
< len
; i
++)
2781 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2786 /* Wrapper of compare_constant, for the htab interface. */
2788 const_desc_eq (const void *p1
, const void *p2
)
2790 const struct constant_descriptor_tree
*const c1
2791 = (const struct constant_descriptor_tree
*) p1
;
2792 const struct constant_descriptor_tree
*const c2
2793 = (const struct constant_descriptor_tree
*) p2
;
2794 if (c1
->hash
!= c2
->hash
)
2796 return compare_constant (c1
->value
, c2
->value
);
2799 /* Compare t1 and t2, and return 1 only if they are known to result in
2800 the same bit pattern on output. */
2803 compare_constant (const tree t1
, const tree t2
)
2805 enum tree_code typecode
;
2807 if (t1
== NULL_TREE
)
2808 return t2
== NULL_TREE
;
2809 if (t2
== NULL_TREE
)
2812 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2815 switch (TREE_CODE (t1
))
2818 /* Integer constants are the same only if the same width of type. */
2819 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2821 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2823 return tree_int_cst_equal (t1
, t2
);
2826 /* Real constants are the same only if the same width of type. */
2827 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2830 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2833 /* Fixed constants are the same only if the same width of type. */
2834 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2837 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2840 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2843 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2844 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2845 TREE_STRING_LENGTH (t1
)));
2848 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2849 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2855 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
2858 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
2859 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
2860 VECTOR_CST_ELT (t2
, i
)))
2868 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
2869 unsigned HOST_WIDE_INT idx
;
2871 typecode
= TREE_CODE (TREE_TYPE (t1
));
2872 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2875 if (typecode
== ARRAY_TYPE
)
2877 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2878 /* For arrays, check that the sizes all match. */
2879 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2881 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2886 /* For record and union constructors, require exact type
2888 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2892 v1
= CONSTRUCTOR_ELTS (t1
);
2893 v2
= CONSTRUCTOR_ELTS (t2
);
2894 if (vec_safe_length (v1
) != vec_safe_length (v2
))
2897 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
2899 constructor_elt
*c1
= &(*v1
)[idx
];
2900 constructor_elt
*c2
= &(*v2
)[idx
];
2902 /* Check that each value is the same... */
2903 if (!compare_constant (c1
->value
, c2
->value
))
2905 /* ... and that they apply to the same fields! */
2906 if (typecode
== ARRAY_TYPE
)
2908 if (!compare_constant (c1
->index
, c2
->index
))
2913 if (c1
->index
!= c2
->index
)
2924 struct addr_const value1
, value2
;
2928 decode_addr_const (t1
, &value1
);
2929 decode_addr_const (t2
, &value2
);
2931 if (value1
.offset
!= value2
.offset
)
2934 code
= GET_CODE (value1
.base
);
2935 if (code
!= GET_CODE (value2
.base
))
2941 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2945 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
2946 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
2956 case POINTER_PLUS_EXPR
:
2959 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2960 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2963 case VIEW_CONVERT_EXPR
:
2964 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2973 /* Make a copy of the whole tree structure for a constant. This
2974 handles the same types of nodes that compare_constant handles. */
2977 copy_constant (tree exp
)
2979 switch (TREE_CODE (exp
))
2982 /* For ADDR_EXPR, we do not want to copy the decl whose address
2983 is requested. We do want to copy constants though. */
2984 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2985 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2986 copy_constant (TREE_OPERAND (exp
, 0)));
2988 return copy_node (exp
);
2994 return copy_node (exp
);
2997 return build_complex (TREE_TYPE (exp
),
2998 copy_constant (TREE_REALPART (exp
)),
2999 copy_constant (TREE_IMAGPART (exp
)));
3002 case POINTER_PLUS_EXPR
:
3004 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
3005 copy_constant (TREE_OPERAND (exp
, 0)),
3006 copy_constant (TREE_OPERAND (exp
, 1)));
3009 case VIEW_CONVERT_EXPR
:
3010 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3011 copy_constant (TREE_OPERAND (exp
, 0)));
3014 return build_vector (TREE_TYPE (exp
), VECTOR_CST_ELTS (exp
));
3018 tree copy
= copy_node (exp
);
3019 vec
<constructor_elt
, va_gc
> *v
;
3020 unsigned HOST_WIDE_INT idx
;
3021 tree purpose
, value
;
3023 vec_alloc (v
, vec_safe_length (CONSTRUCTOR_ELTS (exp
)));
3024 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3026 constructor_elt ce
= {purpose
, copy_constant (value
)};
3029 CONSTRUCTOR_ELTS (copy
) = v
;
3038 /* Return the section into which constant EXP should be placed. */
3041 get_constant_section (tree exp
, unsigned int align
)
3043 return targetm
.asm_out
.select_section (exp
,
3044 compute_reloc_for_constant (exp
),
3048 /* Return the size of constant EXP in bytes. */
3050 static HOST_WIDE_INT
3051 get_constant_size (tree exp
)
3055 size
= int_size_in_bytes (TREE_TYPE (exp
));
3056 if (TREE_CODE (exp
) == STRING_CST
)
3057 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3061 /* Subroutine of output_constant_def:
3062 No constant equal to EXP is known to have been output.
3063 Make a constant descriptor to enter EXP in the hash table.
3064 Assign the label number and construct RTL to refer to the
3065 constant's location in memory.
3066 Caller is responsible for updating the hash table. */
3068 static struct constant_descriptor_tree
*
3069 build_constant_desc (tree exp
)
3071 struct constant_descriptor_tree
*desc
;
3077 desc
= ggc_alloc_constant_descriptor_tree ();
3078 desc
->value
= copy_constant (exp
);
3080 /* Propagate marked-ness to copied constant. */
3081 if (flag_mudflap
&& mf_marked_p (exp
))
3082 mf_mark (desc
->value
);
3084 /* Create a string containing the label name, in LABEL. */
3085 labelno
= const_labelno
++;
3086 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3088 /* Construct the VAR_DECL associated with the constant. */
3089 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3091 DECL_ARTIFICIAL (decl
) = 1;
3092 DECL_IGNORED_P (decl
) = 1;
3093 TREE_READONLY (decl
) = 1;
3094 TREE_STATIC (decl
) = 1;
3095 TREE_ADDRESSABLE (decl
) = 1;
3096 /* We don't set the RTL yet as this would cause varpool to assume that the
3097 variable is referenced. Moreover, it would just be dropped in LTO mode.
3098 Instead we set the flag that will be recognized in make_decl_rtl. */
3099 DECL_IN_CONSTANT_POOL (decl
) = 1;
3100 DECL_INITIAL (decl
) = desc
->value
;
3101 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3102 architectures so use DATA_ALIGNMENT as well, except for strings. */
3103 if (TREE_CODE (exp
) == STRING_CST
)
3105 #ifdef CONSTANT_ALIGNMENT
3106 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3110 align_variable (decl
, 0);
3112 /* Now construct the SYMBOL_REF and the MEM. */
3113 if (use_object_blocks_p ())
3115 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3116 symbol
= create_block_symbol (ggc_strdup (label
),
3117 get_block_for_section (sect
), -1);
3120 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3121 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3122 SET_SYMBOL_REF_DECL (symbol
, decl
);
3123 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3125 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3126 set_mem_attributes (rtl
, exp
, 1);
3127 set_mem_alias_set (rtl
, 0);
3128 set_mem_alias_set (rtl
, const_alias_set
);
3130 /* We cannot share RTX'es in pool entries.
3131 Mark this piece of RTL as required for unsharing. */
3132 RTX_FLAG (rtl
, used
) = 1;
3134 /* Set flags or add text to the name to record information, such as
3135 that it is a local symbol. If the name is changed, the macro
3136 ASM_OUTPUT_LABELREF will have to know how to strip this
3137 information. This call might invalidate our local variable
3138 SYMBOL; we can't use it afterward. */
3139 targetm
.encode_section_info (exp
, rtl
, true);
3146 /* Return an rtx representing a reference to constant data in memory
3147 for the constant expression EXP.
3149 If assembler code for such a constant has already been output,
3150 return an rtx to refer to it.
3151 Otherwise, output such a constant in memory
3152 and generate an rtx for it.
3154 If DEFER is nonzero, this constant can be deferred and output only
3155 if referenced in the function after all optimizations.
3157 `const_desc_table' records which constants already have label strings. */
3160 output_constant_def (tree exp
, int defer
)
3162 struct constant_descriptor_tree
*desc
;
3163 struct constant_descriptor_tree key
;
3166 /* Look up EXP in the table of constant descriptors. If we didn't find
3167 it, create a new one. */
3169 key
.hash
= const_hash_1 (exp
);
3170 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3172 desc
= (struct constant_descriptor_tree
*) *loc
;
3175 desc
= build_constant_desc (exp
);
3176 desc
->hash
= key
.hash
;
3180 maybe_output_constant_def_contents (desc
, defer
);
3184 /* Subroutine of output_constant_def: Decide whether or not we need to
3185 output the constant DESC now, and if so, do it. */
3187 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3190 rtx symbol
= XEXP (desc
->rtl
, 0);
3191 tree exp
= desc
->value
;
3193 if (flag_syntax_only
)
3196 if (TREE_ASM_WRITTEN (exp
))
3197 /* Already output; don't do it again. */
3200 /* We can always defer constants as long as the context allows
3204 /* Increment n_deferred_constants if it exists. It needs to be at
3205 least as large as the number of constants actually referred to
3206 by the function. If it's too small we'll stop looking too early
3207 and fail to emit constants; if it's too large we'll only look
3208 through the entire function when we could have stopped earlier. */
3210 n_deferred_constants
++;
3214 output_constant_def_contents (symbol
);
3217 /* Subroutine of output_constant_def_contents. Output the definition
3218 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3219 constant's alignment in bits. */
3222 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3226 size
= get_constant_size (exp
);
3228 /* Do any machine/system dependent processing of the constant. */
3229 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3231 /* Output the value of EXP. */
3232 output_constant (exp
, size
, align
);
3235 /* We must output the constant data referred to by SYMBOL; do so. */
3238 output_constant_def_contents (rtx symbol
)
3240 tree decl
= SYMBOL_REF_DECL (symbol
);
3241 tree exp
= DECL_INITIAL (decl
);
3244 /* Make sure any other constants whose addresses appear in EXP
3245 are assigned label numbers. */
3246 output_addressed_constants (exp
);
3248 /* We are no longer deferring this constant. */
3249 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3251 /* If the constant is part of an object block, make sure that the
3252 decl has been positioned within its block, but do not write out
3253 its definition yet. output_object_blocks will do that later. */
3254 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3255 place_block_symbol (symbol
);
3258 bool asan_protected
= false;
3259 align
= DECL_ALIGN (decl
);
3260 switch_to_section (get_constant_section (exp
, align
));
3261 if (flag_asan
&& TREE_CODE (exp
) == STRING_CST
3262 && asan_protect_global (exp
))
3264 asan_protected
= true;
3265 align
= MAX (align
, ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3267 if (align
> BITS_PER_UNIT
)
3268 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3269 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3272 HOST_WIDE_INT size
= get_constant_size (exp
);
3273 assemble_zeros (asan_red_zone_size (size
));
3277 mudflap_enqueue_constant (exp
);
3280 /* Look up EXP in the table of constant descriptors. Return the rtl
3281 if it has been emitted, else null. */
3284 lookup_constant_def (tree exp
)
3286 struct constant_descriptor_tree
*desc
;
3287 struct constant_descriptor_tree key
;
3290 key
.hash
= const_hash_1 (exp
);
3291 desc
= (struct constant_descriptor_tree
*)
3292 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3294 return (desc
? desc
->rtl
: NULL_RTX
);
3297 /* Return a tree representing a reference to constant data in memory
3298 for the constant expression EXP.
3300 This is the counterpart of output_constant_def at the Tree level. */
3303 tree_output_constant_def (tree exp
)
3305 struct constant_descriptor_tree
*desc
, key
;
3309 /* Look up EXP in the table of constant descriptors. If we didn't find
3310 it, create a new one. */
3312 key
.hash
= const_hash_1 (exp
);
3313 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3315 desc
= (struct constant_descriptor_tree
*) *loc
;
3318 desc
= build_constant_desc (exp
);
3319 desc
->hash
= key
.hash
;
3323 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3324 varpool_finalize_decl (decl
);
3328 /* Used in the hash tables to avoid outputting the same constant
3329 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3330 are output once per function, not once per file. */
3331 /* ??? Only a few targets need per-function constant pools. Most
3332 can use one per-file pool. Should add a targetm bit to tell the
3335 struct GTY(()) rtx_constant_pool
{
3336 /* Pointers to first and last constant in pool, as ordered by offset. */
3337 struct constant_descriptor_rtx
*first
;
3338 struct constant_descriptor_rtx
*last
;
3340 /* Hash facility for making memory-constants from constant rtl-expressions.
3341 It is used on RISC machines where immediate integer arguments and
3342 constant addresses are restricted so that such constants must be stored
3344 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3346 /* Current offset in constant pool (does not include any
3347 machine-specific header). */
3348 HOST_WIDE_INT offset
;
3351 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3352 struct constant_descriptor_rtx
*next
;
3356 HOST_WIDE_INT offset
;
3358 enum machine_mode mode
;
3364 /* Hash and compare functions for const_rtx_htab. */
3367 const_desc_rtx_hash (const void *ptr
)
3369 const struct constant_descriptor_rtx
*const desc
3370 = (const struct constant_descriptor_rtx
*) ptr
;
3375 const_desc_rtx_eq (const void *a
, const void *b
)
3377 const struct constant_descriptor_rtx
*const x
3378 = (const struct constant_descriptor_rtx
*) a
;
3379 const struct constant_descriptor_rtx
*const y
3380 = (const struct constant_descriptor_rtx
*) b
;
3382 if (x
->mode
!= y
->mode
)
3384 return rtx_equal_p (x
->constant
, y
->constant
);
3387 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3390 const_rtx_hash_1 (rtx
*xp
, void *data
)
3392 unsigned HOST_WIDE_INT hwi
;
3393 enum machine_mode mode
;
3399 code
= GET_CODE (x
);
3400 mode
= GET_MODE (x
);
3401 h
= (hashval_t
) code
* 1048573 + mode
;
3409 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3410 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3413 h
^= (hashval_t
) hwi
;
3414 for (i
= 1; i
< n
; ++i
)
3417 h
^= (hashval_t
) hwi
;
3423 if (mode
== VOIDmode
)
3425 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3429 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3433 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3439 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3440 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3445 h
^= htab_hash_string (XSTR (x
, 0));
3449 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3453 case UNSPEC_VOLATILE
:
3454 h
= h
* 251 + XINT (x
, 1);
3461 hp
= (hashval_t
*) data
;
3462 *hp
= *hp
* 509 + h
;
3466 /* Compute a hash value for X, which should be a constant. */
3469 const_rtx_hash (rtx x
)
3472 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3477 /* Create and return a new rtx constant pool. */
3479 static struct rtx_constant_pool
*
3480 create_constant_pool (void)
3482 struct rtx_constant_pool
*pool
;
3484 pool
= ggc_alloc_rtx_constant_pool ();
3485 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3486 const_desc_rtx_eq
, NULL
);
3493 /* Initialize constant pool hashing for a new function. */
3496 init_varasm_status (void)
3498 crtl
->varasm
.pool
= create_constant_pool ();
3499 crtl
->varasm
.deferred_constants
= 0;
3502 /* Given a MINUS expression, simplify it if both sides
3503 include the same symbol. */
3506 simplify_subtraction (rtx x
)
3508 rtx r
= simplify_rtx (x
);
3512 /* Given a constant rtx X, make (or find) a memory constant for its value
3513 and return a MEM rtx to refer to it in memory. */
3516 force_const_mem (enum machine_mode mode
, rtx x
)
3518 struct constant_descriptor_rtx
*desc
, tmp
;
3519 struct rtx_constant_pool
*pool
;
3526 /* If we're not allowed to drop X into the constant pool, don't. */
3527 if (targetm
.cannot_force_const_mem (mode
, x
))
3530 /* Record that this function has used a constant pool entry. */
3531 crtl
->uses_const_pool
= 1;
3533 /* Decide which pool to use. */
3534 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3535 ? shared_constant_pool
3536 : crtl
->varasm
.pool
);
3538 /* Lookup the value in the hashtable. */
3541 hash
= const_rtx_hash (x
);
3542 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3543 desc
= (struct constant_descriptor_rtx
*) *slot
;
3545 /* If the constant was already present, return its memory. */
3547 return copy_rtx (desc
->mem
);
3549 /* Otherwise, create a new descriptor. */
3550 desc
= ggc_alloc_constant_descriptor_rtx ();
3553 /* Align the location counter as required by EXP's data type. */
3554 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3555 #ifdef CONSTANT_ALIGNMENT
3557 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3558 if (type
!= NULL_TREE
)
3559 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3563 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3564 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3567 desc
->constant
= copy_rtx (tmp
.constant
);
3568 desc
->offset
= pool
->offset
;
3571 desc
->align
= align
;
3572 desc
->labelno
= const_labelno
;
3575 pool
->offset
+= GET_MODE_SIZE (mode
);
3577 pool
->last
->next
= desc
;
3579 pool
->first
= pool
->last
= desc
;
3582 /* Create a string containing the label name, in LABEL. */
3583 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3586 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3587 the constants pool. */
3588 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3590 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3591 symbol
= create_block_symbol (ggc_strdup (label
),
3592 get_block_for_section (sect
), -1);
3595 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3597 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3598 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3599 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3601 /* Construct the MEM. */
3602 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3603 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3604 set_mem_align (def
, align
);
3606 /* If we're dropping a label to the constant pool, make sure we
3608 if (GET_CODE (x
) == LABEL_REF
)
3609 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3611 return copy_rtx (def
);
3614 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3617 get_pool_constant (rtx addr
)
3619 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3622 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3623 and whether it has been output or not. */
3626 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3628 struct constant_descriptor_rtx
*desc
;
3630 desc
= SYMBOL_REF_CONSTANT (addr
);
3631 *pmarked
= (desc
->mark
!= 0);
3632 return desc
->constant
;
3635 /* Similar, return the mode. */
3638 get_pool_mode (const_rtx addr
)
3640 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3643 /* Return the size of the constant pool. */
3646 get_pool_size (void)
3648 return crtl
->varasm
.pool
->offset
;
3651 /* Worker function for output_constant_pool_1. Emit assembly for X
3652 in MODE with known alignment ALIGN. */
3655 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3657 switch (GET_MODE_CLASS (mode
))
3660 case MODE_DECIMAL_FLOAT
:
3664 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3665 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3666 assemble_real (r
, mode
, align
);
3671 case MODE_PARTIAL_INT
:
3676 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3679 case MODE_VECTOR_FLOAT
:
3680 case MODE_VECTOR_INT
:
3681 case MODE_VECTOR_FRACT
:
3682 case MODE_VECTOR_UFRACT
:
3683 case MODE_VECTOR_ACCUM
:
3684 case MODE_VECTOR_UACCUM
:
3687 enum machine_mode submode
= GET_MODE_INNER (mode
);
3688 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3690 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3691 units
= CONST_VECTOR_NUNITS (x
);
3693 for (i
= 0; i
< units
; i
++)
3695 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3696 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3706 /* Worker function for output_constant_pool. Emit constant DESC,
3707 giving it ALIGN bits of alignment. */
3710 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3717 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3718 whose CODE_LABEL has been deleted. This can occur if a jump table
3719 is eliminated by optimization. If so, write a constant of zero
3720 instead. Note that this can also happen by turning the
3721 CODE_LABEL into a NOTE. */
3722 /* ??? This seems completely and utterly wrong. Certainly it's
3723 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3724 functioning even with INSN_DELETED_P and friends. */
3727 switch (GET_CODE (tmp
))
3730 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3731 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3733 tmp
= XEXP (XEXP (tmp
, 0), 0);
3737 tmp
= XEXP (tmp
, 0);
3738 gcc_assert (!INSN_DELETED_P (tmp
));
3739 gcc_assert (!NOTE_P (tmp
)
3740 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3747 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3748 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3749 align
, desc
->labelno
, done
);
3752 assemble_align (align
);
3754 /* Output the label. */
3755 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3757 /* Output the data. */
3758 output_constant_pool_2 (desc
->mode
, x
, align
);
3760 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3761 sections have proper size. */
3762 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3764 && (in_section
->common
.flags
& SECTION_MERGE
))
3765 assemble_align (align
);
3767 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3773 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3774 to as used. Emit referenced deferred strings. This function can
3775 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3778 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3780 rtx x
= *current_rtx
;
3782 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3785 if (CONSTANT_POOL_ADDRESS_P (x
))
3787 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3788 if (desc
->mark
== 0)
3791 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3794 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3796 tree decl
= SYMBOL_REF_DECL (x
);
3797 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3799 n_deferred_constants
--;
3800 output_constant_def_contents (x
);
3807 /* Look through appropriate parts of INSN, marking all entries in the
3808 constant pool which are actually being used. Entries that are only
3809 referenced by other constants are also marked as used. Emit
3810 deferred strings that are used. */
3813 mark_constants (rtx insn
)
3818 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3819 insns, not any notes that may be attached. We don't want to mark
3820 a constant just because it happens to appear in a REG_EQUIV note. */
3821 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3823 rtx seq
= PATTERN (insn
);
3824 int i
, n
= XVECLEN (seq
, 0);
3825 for (i
= 0; i
< n
; ++i
)
3827 rtx subinsn
= XVECEXP (seq
, 0, i
);
3828 if (INSN_P (subinsn
))
3829 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3833 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3836 /* Look through the instructions for this function, and mark all the
3837 entries in POOL which are actually being used. Emit deferred constants
3838 which have indeed been used. */
3841 mark_constant_pool (void)
3845 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3848 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3849 mark_constants (insn
);
3852 /* Write all the constants in POOL. */
3855 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3857 struct constant_descriptor_rtx
*desc
;
3859 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3862 /* If the constant is part of an object_block, make sure that
3863 the constant has been positioned within its block, but do not
3864 write out its definition yet. output_object_blocks will do
3866 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3867 && SYMBOL_REF_BLOCK (desc
->sym
))
3868 place_block_symbol (desc
->sym
);
3871 switch_to_section (targetm
.asm_out
.select_rtx_section
3872 (desc
->mode
, desc
->constant
, desc
->align
));
3873 output_constant_pool_1 (desc
, desc
->align
);
3878 /* Mark all constants that are used in the current function, then write
3879 out the function's private constant pool. */
3882 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3883 tree fndecl ATTRIBUTE_UNUSED
)
3885 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3887 /* It is possible for gcc to call force_const_mem and then to later
3888 discard the instructions which refer to the constant. In such a
3889 case we do not need to output the constant. */
3890 mark_constant_pool ();
3892 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3893 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3896 output_constant_pool_contents (pool
);
3898 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3899 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3903 /* Write the contents of the shared constant pool. */
3906 output_shared_constant_pool (void)
3908 output_constant_pool_contents (shared_constant_pool
);
3911 /* Determine what kind of relocations EXP may need. */
3914 compute_reloc_for_constant (tree exp
)
3916 int reloc
= 0, reloc2
;
3919 switch (TREE_CODE (exp
))
3923 /* Go inside any operations that get_inner_reference can handle and see
3924 if what's inside is a constant: no need to do anything here for
3925 addresses of variables or functions. */
3926 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3927 tem
= TREE_OPERAND (tem
, 0))
3930 if (TREE_CODE (tem
) == MEM_REF
3931 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
3933 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
3937 if (TREE_PUBLIC (tem
))
3944 case POINTER_PLUS_EXPR
:
3945 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3946 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3950 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3951 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3952 /* The difference of two local labels is computable at link time. */
3953 if (reloc
== 1 && reloc2
== 1)
3960 case VIEW_CONVERT_EXPR
:
3961 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3966 unsigned HOST_WIDE_INT idx
;
3967 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3969 reloc
|= compute_reloc_for_constant (tem
);
3979 /* Find all the constants whose addresses are referenced inside of EXP,
3980 and make sure assembler code with a label has been output for each one.
3981 Indicate whether an ADDR_EXPR has been encountered. */
3984 output_addressed_constants (tree exp
)
3988 switch (TREE_CODE (exp
))
3992 /* Go inside any operations that get_inner_reference can handle and see
3993 if what's inside is a constant: no need to do anything here for
3994 addresses of variables or functions. */
3995 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3996 tem
= TREE_OPERAND (tem
, 0))
3999 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4000 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4001 tem
= DECL_INITIAL (tem
);
4003 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4004 output_constant_def (tem
, 0);
4006 if (TREE_CODE (tem
) == MEM_REF
)
4007 output_addressed_constants (TREE_OPERAND (tem
, 0));
4011 case POINTER_PLUS_EXPR
:
4013 output_addressed_constants (TREE_OPERAND (exp
, 1));
4017 case VIEW_CONVERT_EXPR
:
4018 output_addressed_constants (TREE_OPERAND (exp
, 0));
4023 unsigned HOST_WIDE_INT idx
;
4024 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4026 output_addressed_constants (tem
);
4035 /* Whether a constructor CTOR is a valid static constant initializer if all
4036 its elements are. This used to be internal to initializer_constant_valid_p
4037 and has been exposed to let other functions like categorize_ctor_elements
4038 evaluate the property while walking a constructor for other purposes. */
4041 constructor_static_from_elts_p (const_tree ctor
)
4043 return (TREE_CONSTANT (ctor
)
4044 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4045 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4046 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4049 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4052 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4053 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4054 which are valid when ENDTYPE is an integer of any size; in
4055 particular, this does not accept a pointer minus a constant. This
4056 returns null_pointer_node if the VALUE is an absolute constant
4057 which can be used to initialize a static variable. Otherwise it
4061 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4065 if (!INTEGRAL_TYPE_P (endtype
))
4068 op0
= TREE_OPERAND (value
, 0);
4069 op1
= TREE_OPERAND (value
, 1);
4071 /* Like STRIP_NOPS except allow the operand mode to widen. This
4072 works around a feature of fold that simplifies (int)(p1 - p2) to
4073 ((int)p1 - (int)p2) under the theory that the narrower operation
4076 while (CONVERT_EXPR_P (op0
)
4077 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4079 tree inner
= TREE_OPERAND (op0
, 0);
4080 if (inner
== error_mark_node
4081 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4082 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4083 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4088 while (CONVERT_EXPR_P (op1
)
4089 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4091 tree inner
= TREE_OPERAND (op1
, 0);
4092 if (inner
== error_mark_node
4093 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4094 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4095 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4100 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4104 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4105 cache
? cache
+ 2 : NULL
);
4106 /* Both initializers must be known. */
4110 && (op0
== null_pointer_node
4111 || TREE_CODE (value
) == MINUS_EXPR
))
4112 return null_pointer_node
;
4114 /* Support differences between labels. */
4115 if (TREE_CODE (op0
) == LABEL_DECL
4116 && TREE_CODE (op1
) == LABEL_DECL
)
4117 return null_pointer_node
;
4119 if (TREE_CODE (op0
) == STRING_CST
4120 && TREE_CODE (op1
) == STRING_CST
4121 && operand_equal_p (op0
, op1
, 1))
4122 return null_pointer_node
;
4128 /* Helper function of initializer_constant_valid_p.
4129 Return nonzero if VALUE is a valid constant-valued expression
4130 for use in initializing a static variable; one that can be an
4131 element of a "constant" initializer.
4133 Return null_pointer_node if the value is absolute;
4134 if it is relocatable, return the variable that determines the relocation.
4135 We assume that VALUE has been folded as much as possible;
4136 therefore, we do not need to check for such things as
4137 arithmetic-combinations of integers.
4139 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4142 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4146 switch (TREE_CODE (value
))
4149 if (constructor_static_from_elts_p (value
))
4151 unsigned HOST_WIDE_INT idx
;
4153 bool absolute
= true;
4155 if (cache
&& cache
[0] == value
)
4157 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4160 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4167 cache
[1] = NULL_TREE
;
4171 if (reloc
!= null_pointer_node
)
4174 /* For a non-absolute relocation, there is no single
4175 variable that can be "the variable that determines the
4180 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4182 return absolute
? null_pointer_node
: error_mark_node
;
4185 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4193 return null_pointer_node
;
4198 tree op0
= staticp (TREE_OPERAND (value
, 0));
4201 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4202 to be a constant, this is old-skool offsetof-like nonsense. */
4203 if (TREE_CODE (op0
) == INDIRECT_REF
4204 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4205 return null_pointer_node
;
4206 /* Taking the address of a nested function involves a trampoline,
4207 unless we don't need or want one. */
4208 if (TREE_CODE (op0
) == FUNCTION_DECL
4209 && DECL_STATIC_CHAIN (op0
)
4210 && !TREE_NO_TRAMPOLINE (value
))
4212 /* "&{...}" requires a temporary to hold the constructed
4214 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4220 case NON_LVALUE_EXPR
:
4221 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4224 case VIEW_CONVERT_EXPR
:
4226 tree src
= TREE_OPERAND (value
, 0);
4227 tree src_type
= TREE_TYPE (src
);
4228 tree dest_type
= TREE_TYPE (value
);
4230 /* Allow view-conversions from aggregate to non-aggregate type only
4231 if the bit pattern is fully preserved afterwards; otherwise, the
4232 RTL expander won't be able to apply a subsequent transformation
4233 to the underlying constructor. */
4234 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4236 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4237 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4242 /* Allow all other kinds of view-conversion. */
4243 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4248 tree src
= TREE_OPERAND (value
, 0);
4249 tree src_type
= TREE_TYPE (src
);
4250 tree dest_type
= TREE_TYPE (value
);
4252 /* Allow conversions between pointer types, floating-point
4253 types, and offset types. */
4254 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4255 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4256 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4257 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4258 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4260 /* Allow length-preserving conversions between integer types. */
4261 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4262 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4263 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4265 /* Allow conversions between other integer types only if
4267 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4269 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4270 if (inner
== null_pointer_node
)
4271 return null_pointer_node
;
4275 /* Allow (int) &foo provided int is as wide as a pointer. */
4276 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4277 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4278 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4280 /* Likewise conversions from int to pointers, but also allow
4281 conversions from 0. */
4282 if ((POINTER_TYPE_P (dest_type
)
4283 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4284 && INTEGRAL_TYPE_P (src_type
))
4286 if (TREE_CODE (src
) == INTEGER_CST
4287 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4288 return null_pointer_node
;
4289 if (integer_zerop (src
))
4290 return null_pointer_node
;
4291 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4292 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4295 /* Allow conversions to struct or union types if the value
4297 if (TREE_CODE (dest_type
) == RECORD_TYPE
4298 || TREE_CODE (dest_type
) == UNION_TYPE
)
4299 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4303 case POINTER_PLUS_EXPR
:
4305 /* Any valid floating-point constants will have been folded by now;
4306 with -frounding-math we hit this with addition of two constants. */
4307 if (TREE_CODE (endtype
) == REAL_TYPE
)
4309 if (cache
&& cache
[0] == value
)
4311 if (! INTEGRAL_TYPE_P (endtype
)
4312 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4314 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4316 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4319 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4320 endtype
, ncache
+ 2);
4321 /* If either term is absolute, use the other term's relocation. */
4322 if (valid0
== null_pointer_node
)
4324 else if (valid1
== null_pointer_node
)
4326 /* Support narrowing pointer differences. */
4328 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4332 /* Support narrowing pointer differences. */
4333 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4342 if (TREE_CODE (endtype
) == REAL_TYPE
)
4344 if (cache
&& cache
[0] == value
)
4346 if (! INTEGRAL_TYPE_P (endtype
)
4347 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4349 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4351 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4354 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4355 endtype
, ncache
+ 2);
4356 /* Win if second argument is absolute. */
4357 if (valid1
== null_pointer_node
)
4359 /* Win if both arguments have the same relocation.
4360 Then the value is absolute. */
4361 else if (valid0
== valid1
&& valid0
!= 0)
4362 ret
= null_pointer_node
;
4363 /* Since GCC guarantees that string constants are unique in the
4364 generated code, a subtraction between two copies of the same
4365 constant string is absolute. */
4366 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4367 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4368 && operand_equal_p (valid0
, valid1
, 1))
4369 ret
= null_pointer_node
;
4370 /* Support narrowing differences. */
4372 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4376 /* Support narrowing differences. */
4377 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4392 /* Return nonzero if VALUE is a valid constant-valued expression
4393 for use in initializing a static variable; one that can be an
4394 element of a "constant" initializer.
4396 Return null_pointer_node if the value is absolute;
4397 if it is relocatable, return the variable that determines the relocation.
4398 We assume that VALUE has been folded as much as possible;
4399 therefore, we do not need to check for such things as
4400 arithmetic-combinations of integers. */
4402 initializer_constant_valid_p (tree value
, tree endtype
)
4404 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4407 /* Return true if VALUE is a valid constant-valued expression
4408 for use in initializing a static bit-field; one that can be
4409 an element of a "constant" initializer. */
4412 initializer_constant_valid_for_bitfield_p (tree value
)
4414 /* For bitfields we support integer constants or possibly nested aggregates
4416 switch (TREE_CODE (value
))
4420 unsigned HOST_WIDE_INT idx
;
4423 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4424 if (!initializer_constant_valid_for_bitfield_p (elt
))
4433 case VIEW_CONVERT_EXPR
:
4434 case NON_LVALUE_EXPR
:
4436 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4445 /* output_constructor outer state of relevance in recursive calls, typically
4446 for nested aggregate bitfields. */
4449 unsigned int bit_offset
; /* current position in ... */
4450 int byte
; /* ... the outer byte buffer. */
4453 static unsigned HOST_WIDE_INT
4454 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4457 /* Output assembler code for constant EXP to FILE, with no label.
4458 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4459 Assumes output_addressed_constants has been done on EXP already.
4461 Generate exactly SIZE bytes of assembler data, padding at the end
4462 with zeros if necessary. SIZE must always be specified.
4464 SIZE is important for structure constructors,
4465 since trailing members may have been omitted from the constructor.
4466 It is also important for initialization of arrays from string constants
4467 since the full length of the string constant might not be wanted.
4468 It is also needed for initialization of unions, where the initializer's
4469 type is just one member, and that may not be as long as the union.
4471 There a case in which we would fail to output exactly SIZE bytes:
4472 for a structure constructor that wants to produce more than SIZE bytes.
4473 But such constructors will never be generated for any possible input.
4475 ALIGN is the alignment of the data in bits. */
4478 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4480 enum tree_code code
;
4481 unsigned HOST_WIDE_INT thissize
;
4483 if (size
== 0 || flag_syntax_only
)
4486 /* See if we're trying to initialize a pointer in a non-default mode
4487 to the address of some declaration somewhere. If the target says
4488 the mode is valid for pointers, assume the target has a way of
4490 if (TREE_CODE (exp
) == NOP_EXPR
4491 && POINTER_TYPE_P (TREE_TYPE (exp
))
4492 && targetm
.addr_space
.valid_pointer_mode
4493 (TYPE_MODE (TREE_TYPE (exp
)),
4494 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4496 tree saved_type
= TREE_TYPE (exp
);
4498 /* Peel off any intermediate conversions-to-pointer for valid
4500 while (TREE_CODE (exp
) == NOP_EXPR
4501 && POINTER_TYPE_P (TREE_TYPE (exp
))
4502 && targetm
.addr_space
.valid_pointer_mode
4503 (TYPE_MODE (TREE_TYPE (exp
)),
4504 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4505 exp
= TREE_OPERAND (exp
, 0);
4507 /* If what we're left with is the address of something, we can
4508 convert the address to the final type and output it that
4510 if (TREE_CODE (exp
) == ADDR_EXPR
)
4511 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4512 /* Likewise for constant ints. */
4513 else if (TREE_CODE (exp
) == INTEGER_CST
)
4514 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4515 TREE_INT_CST_HIGH (exp
));
4519 /* Eliminate any conversions since we'll be outputting the underlying
4521 while (CONVERT_EXPR_P (exp
)
4522 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4523 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4525 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4526 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4528 /* Make sure eliminating the conversion is really a no-op, except with
4529 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4530 union types to allow for Ada unchecked unions. */
4531 if (type_size
> op_size
4532 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4533 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4534 /* Keep the conversion. */
4537 exp
= TREE_OPERAND (exp
, 0);
4540 code
= TREE_CODE (TREE_TYPE (exp
));
4541 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4543 /* Allow a constructor with no elements for any data type.
4544 This means to fill the space with zeros. */
4545 if (TREE_CODE (exp
) == CONSTRUCTOR
4546 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4548 assemble_zeros (size
);
4552 if (TREE_CODE (exp
) == FDESC_EXPR
)
4554 #ifdef ASM_OUTPUT_FDESC
4555 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4556 tree decl
= TREE_OPERAND (exp
, 0);
4557 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4564 /* Now output the underlying data. If we've handling the padding, return.
4565 Otherwise, break and ensure SIZE is the size written. */
4572 case REFERENCE_TYPE
:
4574 case FIXED_POINT_TYPE
:
4575 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4576 EXPAND_INITIALIZER
),
4577 MIN (size
, thissize
), align
, 0))
4578 error ("initializer for integer/fixed-point value is too complicated");
4582 if (TREE_CODE (exp
) != REAL_CST
)
4583 error ("initializer for floating value is not a floating constant");
4585 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4589 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4590 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4591 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4596 switch (TREE_CODE (exp
))
4599 output_constructor (exp
, size
, align
, NULL
);
4602 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4604 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4610 unsigned int i
, nalign
;
4611 enum machine_mode inner
;
4613 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4614 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4616 elt_size
= GET_MODE_SIZE (inner
);
4618 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4619 thissize
= elt_size
;
4620 for (i
= 1; i
< VECTOR_CST_NELTS (exp
); ++i
)
4622 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4623 thissize
+= elt_size
;
4634 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4635 output_constructor (exp
, size
, align
, NULL
);
4645 if (size
> thissize
)
4646 assemble_zeros (size
- thissize
);
4650 /* Subroutine of output_constructor, used for computing the size of
4651 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4652 type with an unspecified upper bound. */
4654 static unsigned HOST_WIDE_INT
4655 array_size_for_constructor (tree val
)
4658 unsigned HOST_WIDE_INT cnt
;
4659 tree index
, value
, tmp
;
4662 /* This code used to attempt to handle string constants that are not
4663 arrays of single-bytes, but nothing else does, so there's no point in
4665 if (TREE_CODE (val
) == STRING_CST
)
4666 return TREE_STRING_LENGTH (val
);
4668 max_index
= NULL_TREE
;
4669 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4671 if (TREE_CODE (index
) == RANGE_EXPR
)
4672 index
= TREE_OPERAND (index
, 1);
4673 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4677 if (max_index
== NULL_TREE
)
4680 /* Compute the total number of array elements. */
4681 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4682 i
= tree_to_double_int (max_index
) - tree_to_double_int (tmp
);
4683 i
+= double_int_one
;
4685 /* Multiply by the array element unit size to find number of bytes. */
4686 i
*= tree_to_double_int (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4688 gcc_assert (i
.fits_uhwi ());
4692 /* Other datastructures + helpers for output_constructor. */
4694 /* output_constructor local state to support interaction with helpers. */
4698 /* Received arguments. */
4699 tree exp
; /* Constructor expression. */
4700 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4701 unsigned int align
; /* Known initial alignment. */
4703 /* Constructor expression data. */
4704 tree type
; /* Expression type. */
4705 tree field
; /* Current field decl in a record. */
4706 tree min_index
; /* Lower bound if specified for an array. */
4708 /* Output processing state. */
4709 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4710 bool byte_buffer_in_use
; /* Whether byte ... */
4711 int byte
; /* ... contains part of a bitfield byte yet to
4714 int last_relative_index
; /* Implicit or explicit index of the last
4715 array element output within a bitfield. */
4716 /* Current element. */
4717 tree val
; /* Current element value. */
4718 tree index
; /* Current element index. */
4722 /* Helper for output_constructor. From the current LOCAL state, output a
4723 RANGE_EXPR element. */
4726 output_constructor_array_range (oc_local_state
*local
)
4728 unsigned HOST_WIDE_INT fieldsize
4729 = int_size_in_bytes (TREE_TYPE (local
->type
));
4731 HOST_WIDE_INT lo_index
4732 = tree_low_cst (TREE_OPERAND (local
->index
, 0), 0);
4733 HOST_WIDE_INT hi_index
4734 = tree_low_cst (TREE_OPERAND (local
->index
, 1), 0);
4735 HOST_WIDE_INT index
;
4738 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4740 for (index
= lo_index
; index
<= hi_index
; index
++)
4742 /* Output the element's initial value. */
4743 if (local
->val
== NULL_TREE
)
4744 assemble_zeros (fieldsize
);
4746 output_constant (local
->val
, fieldsize
, align2
);
4748 /* Count its size. */
4749 local
->total_bytes
+= fieldsize
;
4753 /* Helper for output_constructor. From the current LOCAL state, output a
4754 field element that is not true bitfield or part of an outer one. */
4757 output_constructor_regular_field (oc_local_state
*local
)
4759 /* Field size and position. Since this structure is static, we know the
4760 positions are constant. */
4761 unsigned HOST_WIDE_INT fieldsize
;
4762 HOST_WIDE_INT fieldpos
;
4764 unsigned int align2
;
4766 if (local
->index
!= NULL_TREE
)
4768 /* Perform the index calculation in modulo arithmetic but
4769 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4770 but we are using an unsigned sizetype. */
4771 unsigned prec
= TYPE_PRECISION (sizetype
);
4772 double_int idx
= tree_to_double_int (local
->index
)
4773 - tree_to_double_int (local
->min_index
);
4774 idx
= idx
.sext (prec
);
4775 fieldpos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)), 1)
4778 else if (local
->field
!= NULL_TREE
)
4779 fieldpos
= int_byte_position (local
->field
);
4783 /* Output any buffered-up bit-fields preceding this element. */
4784 if (local
->byte_buffer_in_use
)
4786 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4787 local
->total_bytes
++;
4788 local
->byte_buffer_in_use
= false;
4791 /* Advance to offset of this element.
4792 Note no alignment needed in an array, since that is guaranteed
4793 if each element has the proper size. */
4794 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4795 && fieldpos
!= local
->total_bytes
)
4797 gcc_assert (fieldpos
>= local
->total_bytes
);
4798 assemble_zeros (fieldpos
- local
->total_bytes
);
4799 local
->total_bytes
= fieldpos
;
4802 /* Find the alignment of this element. */
4803 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4805 /* Determine size this element should occupy. */
4810 /* If this is an array with an unspecified upper bound,
4811 the initializer determines the size. */
4812 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4813 but we cannot do this until the deprecated support for
4814 initializing zero-length array members is removed. */
4815 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4816 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4817 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4819 fieldsize
= array_size_for_constructor (local
->val
);
4820 /* Given a non-empty initialization, this field had
4822 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4825 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (local
->field
), 1);
4828 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4830 /* Output the element's initial value. */
4831 if (local
->val
== NULL_TREE
)
4832 assemble_zeros (fieldsize
);
4834 output_constant (local
->val
, fieldsize
, align2
);
4836 /* Count its size. */
4837 local
->total_bytes
+= fieldsize
;
4840 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4841 output an element that is a true bitfield or part of an outer one. */
4844 output_constructor_bitfield (oc_local_state
*local
, oc_outer_state
*outer
)
4846 /* Bit size of this element. */
4847 HOST_WIDE_INT ebitsize
4849 ? tree_low_cst (DECL_SIZE (local
->field
), 1)
4850 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local
->type
)), 1));
4852 /* Relative index of this element if this is an array component. */
4853 HOST_WIDE_INT relative_index
4856 ? (tree_low_cst (local
->index
, 0)
4857 - tree_low_cst (local
->min_index
, 0))
4858 : local
->last_relative_index
+ 1)
4861 /* Bit position of this element from the start of the containing
4863 HOST_WIDE_INT constructor_relative_ebitpos
4865 ? int_bit_position (local
->field
)
4866 : ebitsize
* relative_index
);
4868 /* Bit position of this element from the start of a possibly ongoing
4869 outer byte buffer. */
4870 HOST_WIDE_INT byte_relative_ebitpos
4871 = ((outer
? outer
->bit_offset
: 0) + constructor_relative_ebitpos
);
4873 /* From the start of a possibly ongoing outer byte buffer, offsets to
4874 the first bit of this element and to the first bit past the end of
4876 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4877 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4879 local
->last_relative_index
= relative_index
;
4881 if (local
->val
== NULL_TREE
)
4882 local
->val
= integer_zero_node
;
4884 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4885 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4886 local
->val
= TREE_OPERAND (local
->val
, 0);
4888 if (TREE_CODE (local
->val
) != INTEGER_CST
4889 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4891 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4895 /* If this field does not start in this (or, next) byte,
4897 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4899 /* Output remnant of any bit field in previous bytes. */
4900 if (local
->byte_buffer_in_use
)
4902 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4903 local
->total_bytes
++;
4904 local
->byte_buffer_in_use
= false;
4907 /* If still not at proper byte, advance to there. */
4908 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4910 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
4911 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
4912 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
4916 /* Set up the buffer if necessary. */
4917 if (!local
->byte_buffer_in_use
)
4921 local
->byte_buffer_in_use
= true;
4924 /* If this is nested constructor, recurse passing the bit offset and the
4925 pending data, then retrieve the new pending data afterwards. */
4926 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
4928 oc_outer_state output_state
;
4930 output_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
4931 output_state
.byte
= local
->byte
;
4933 += output_constructor (local
->val
, 0, 0, &output_state
);
4934 local
->byte
= output_state
.byte
;
4938 /* Otherwise, we must split the element into pieces that fall within
4939 separate bytes, and combine each byte with previous or following
4941 while (next_offset
< end_offset
)
4945 HOST_WIDE_INT value
;
4946 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4947 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4949 /* Advance from byte to byte
4950 within this element when necessary. */
4951 while (next_byte
!= local
->total_bytes
)
4953 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4954 local
->total_bytes
++;
4958 /* Number of bits we can process at once
4959 (all part of the same byte). */
4960 this_time
= MIN (end_offset
- next_offset
,
4961 BITS_PER_UNIT
- next_bit
);
4962 if (BYTES_BIG_ENDIAN
)
4964 /* On big-endian machine, take the most significant bits
4965 first (of the bits that are significant)
4966 and put them into bytes from the most significant end. */
4967 shift
= end_offset
- next_offset
- this_time
;
4969 /* Don't try to take a bunch of bits that cross
4970 the word boundary in the INTEGER_CST. We can
4971 only select bits from the LOW or HIGH part
4973 if (shift
< HOST_BITS_PER_WIDE_INT
4974 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4976 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4977 shift
= HOST_BITS_PER_WIDE_INT
;
4980 /* Now get the bits from the appropriate constant word. */
4981 if (shift
< HOST_BITS_PER_WIDE_INT
)
4982 value
= TREE_INT_CST_LOW (local
->val
);
4985 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
4986 value
= TREE_INT_CST_HIGH (local
->val
);
4987 shift
-= HOST_BITS_PER_WIDE_INT
;
4990 /* Get the result. This works only when:
4991 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4992 local
->byte
|= (((value
>> shift
)
4993 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4994 << (BITS_PER_UNIT
- this_time
- next_bit
));
4998 /* On little-endian machines,
4999 take first the least significant bits of the value
5000 and pack them starting at the least significant
5001 bits of the bytes. */
5002 shift
= next_offset
- byte_relative_ebitpos
;
5004 /* Don't try to take a bunch of bits that cross
5005 the word boundary in the INTEGER_CST. We can
5006 only select bits from the LOW or HIGH part
5008 if (shift
< HOST_BITS_PER_WIDE_INT
5009 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
5010 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
5012 /* Now get the bits from the appropriate constant word. */
5013 if (shift
< HOST_BITS_PER_WIDE_INT
)
5014 value
= TREE_INT_CST_LOW (local
->val
);
5017 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5018 value
= TREE_INT_CST_HIGH (local
->val
);
5019 shift
-= HOST_BITS_PER_WIDE_INT
;
5022 /* Get the result. This works only when:
5023 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5024 local
->byte
|= (((value
>> shift
)
5025 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5029 next_offset
+= this_time
;
5030 local
->byte_buffer_in_use
= true;
5034 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5035 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5036 caller output state of relevance in recursive invocations. */
5038 static unsigned HOST_WIDE_INT
5039 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5040 unsigned int align
, oc_outer_state
* outer
)
5042 unsigned HOST_WIDE_INT cnt
;
5043 constructor_elt
*ce
;
5045 oc_local_state local
;
5047 /* Setup our local state to communicate with helpers. */
5050 local
.align
= align
;
5052 local
.total_bytes
= 0;
5053 local
.byte_buffer_in_use
= outer
!= NULL
;
5054 local
.byte
= outer
? outer
->byte
: 0;
5056 local
.type
= TREE_TYPE (exp
);
5058 local
.last_relative_index
= -1;
5060 local
.min_index
= NULL_TREE
;
5061 if (TREE_CODE (local
.type
) == ARRAY_TYPE
5062 && TYPE_DOMAIN (local
.type
) != NULL_TREE
)
5063 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5065 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5067 /* As CE goes through the elements of the constant, FIELD goes through the
5068 structure fields if the constant is a structure. If the constant is a
5069 union, we override this by getting the field from the TREE_LIST element.
5070 But the constant could also be an array. Then FIELD is zero.
5072 There is always a maximum of one element in the chain LINK for unions
5073 (even if the initializer in a source program incorrectly contains
5076 local
.field
= NULL_TREE
;
5077 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5078 local
.field
= TYPE_FIELDS (local
.type
);
5081 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5082 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5084 local
.val
= ce
->value
;
5085 local
.index
= NULL_TREE
;
5087 /* The element in a union constructor specifies the proper field
5089 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5090 local
.field
= ce
->index
;
5092 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5093 local
.index
= ce
->index
;
5095 if (local
.field
&& flag_verbose_asm
)
5096 fprintf (asm_out_file
, "%s %s:\n",
5098 DECL_NAME (local
.field
)
5099 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5102 /* Eliminate the marker that makes a cast not be an lvalue. */
5103 if (local
.val
!= NULL_TREE
)
5104 STRIP_NOPS (local
.val
);
5106 /* Output the current element, using the appropriate helper ... */
5108 /* For an array slice not part of an outer bitfield. */
5110 && local
.index
!= NULL_TREE
5111 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5112 output_constructor_array_range (&local
);
5114 /* For a field that is neither a true bitfield nor part of an outer one,
5115 known to be at least byte aligned and multiple-of-bytes long. */
5117 && (local
.field
== NULL_TREE
5118 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5119 output_constructor_regular_field (&local
);
5121 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5122 supported for scalar fields, so we may need to convert first. */
5125 if (TREE_CODE (local
.val
) == REAL_CST
)
5127 = fold_unary (VIEW_CONVERT_EXPR
,
5128 build_nonstandard_integer_type
5129 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5131 output_constructor_bitfield (&local
, outer
);
5135 /* If we are not at toplevel, save the pending data for our caller.
5136 Otherwise output the pending data and padding zeros as needed. */
5138 outer
->byte
= local
.byte
;
5141 if (local
.byte_buffer_in_use
)
5143 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5144 local
.total_bytes
++;
5147 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5149 assemble_zeros (local
.size
- local
.total_bytes
);
5150 local
.total_bytes
= local
.size
;
5154 return local
.total_bytes
;
5157 /* Mark DECL as weak. */
5160 mark_weak (tree decl
)
5162 DECL_WEAK (decl
) = 1;
5164 if (DECL_RTL_SET_P (decl
)
5165 && MEM_P (DECL_RTL (decl
))
5166 && XEXP (DECL_RTL (decl
), 0)
5167 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5168 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5171 /* Merge weak status between NEWDECL and OLDDECL. */
5174 merge_weak (tree newdecl
, tree olddecl
)
5176 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5178 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5181 /* We put the NEWDECL on the weak_decls list at some point
5182 and OLDDECL as well. Keep just OLDDECL on the list. */
5183 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5184 if (TREE_VALUE (*pwd
) == newdecl
)
5186 *pwd
= TREE_CHAIN (*pwd
);
5193 if (DECL_WEAK (newdecl
))
5197 /* NEWDECL is weak, but OLDDECL is not. */
5199 /* If we already output the OLDDECL, we're in trouble; we can't
5200 go back and make it weak. This should never happen in
5201 unit-at-a-time compilation. */
5202 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5204 /* If we've already generated rtl referencing OLDDECL, we may
5205 have done so in a way that will not function properly with
5206 a weak symbol. Again in unit-at-a-time this should be
5208 gcc_assert (!TREE_USED (olddecl
)
5209 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5211 if (TARGET_SUPPORTS_WEAK
)
5213 /* We put the NEWDECL on the weak_decls list at some point.
5214 Replace it with the OLDDECL. */
5215 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5216 if (TREE_VALUE (wd
) == newdecl
)
5218 TREE_VALUE (wd
) = olddecl
;
5221 /* We may not find the entry on the list. If NEWDECL is a
5222 weak alias, then we will have already called
5223 globalize_decl to remove the entry; in that case, we do
5224 not need to do anything. */
5227 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5228 mark_weak (olddecl
);
5231 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5232 weak. Just update NEWDECL to indicate that it's weak too. */
5233 mark_weak (newdecl
);
5236 /* Declare DECL to be a weak symbol. */
5239 declare_weak (tree decl
)
5241 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5242 if (! TREE_PUBLIC (decl
))
5243 error ("weak declaration of %q+D must be public", decl
);
5244 else if (!TARGET_SUPPORTS_WEAK
)
5245 warning (0, "weak declaration of %q+D not supported", decl
);
5248 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5249 DECL_ATTRIBUTES (decl
)
5250 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5254 weak_finish_1 (tree decl
)
5256 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5257 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5260 if (! TREE_USED (decl
))
5263 #ifdef ASM_WEAKEN_DECL
5264 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5266 #ifdef ASM_WEAKEN_LABEL
5267 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5269 #ifdef ASM_OUTPUT_WEAK_ALIAS
5271 static bool warn_once
= 0;
5274 warning (0, "only weak aliases are supported in this configuration");
5284 /* Fiven an assembly name, find the decl it is associated with. */
5286 find_decl (tree target
)
5288 symtab_node node
= symtab_node_for_asm (target
);
5290 return node
->symbol
.decl
;
5294 /* This TREE_LIST contains weakref targets. */
5296 static GTY(()) tree weakref_targets
;
5298 /* Emit any pending weak declarations. */
5305 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5307 tree alias_decl
= TREE_PURPOSE (t
);
5308 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5310 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5311 /* Remove alias_decl from the weak list, but leave entries for
5312 the target alone. */
5314 #ifndef ASM_OUTPUT_WEAKREF
5315 else if (! TREE_SYMBOL_REFERENCED (target
))
5317 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5318 defined, otherwise we and weak_finish_1 would use
5319 different macros. */
5320 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5321 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5323 tree decl
= find_decl (target
);
5327 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5328 TREE_CODE (alias_decl
), target
,
5329 TREE_TYPE (alias_decl
));
5331 DECL_EXTERNAL (decl
) = 1;
5332 TREE_PUBLIC (decl
) = 1;
5333 DECL_ARTIFICIAL (decl
) = 1;
5334 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5335 TREE_USED (decl
) = 1;
5338 weak_finish_1 (decl
);
5347 /* Remove the alias and the target from the pending weak list
5348 so that we do not emit any .weak directives for the former,
5349 nor multiple .weak directives for the latter. */
5350 for (p
= &weak_decls
; (t2
= *p
) ; )
5352 if (TREE_VALUE (t2
) == alias_decl
5353 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5354 *p
= TREE_CHAIN (t2
);
5356 p
= &TREE_CHAIN (t2
);
5359 /* Remove other weakrefs to the same target, to speed things up. */
5360 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5362 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5363 *p
= TREE_CHAIN (t2
);
5365 p
= &TREE_CHAIN (t2
);
5370 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5372 tree decl
= TREE_VALUE (t
);
5374 weak_finish_1 (decl
);
5378 /* Emit the assembly bits to indicate that DECL is globally visible. */
5381 globalize_decl (tree decl
)
5384 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5385 if (DECL_WEAK (decl
))
5387 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5390 #ifdef ASM_WEAKEN_DECL
5391 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5393 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5396 /* Remove this function from the pending weak list so that
5397 we do not emit multiple .weak directives for it. */
5398 for (p
= &weak_decls
; (t
= *p
) ; )
5400 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5401 *p
= TREE_CHAIN (t
);
5403 p
= &TREE_CHAIN (t
);
5406 /* Remove weakrefs to the same target from the pending weakref
5407 list, for the same reason. */
5408 for (p
= &weakref_targets
; (t
= *p
) ; )
5410 if (DECL_ASSEMBLER_NAME (decl
)
5411 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5412 *p
= TREE_CHAIN (t
);
5414 p
= &TREE_CHAIN (t
);
5421 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5424 vec
<alias_pair
, va_gc
> *alias_pairs
;
5426 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5427 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5428 tree node is DECL to have the value of the tree node TARGET. */
5431 do_assemble_alias (tree decl
, tree target
)
5433 /* Emulated TLS had better not get this var. */
5434 gcc_assert(!(!targetm
.have_tls
5435 && TREE_CODE (decl
) == VAR_DECL
5436 && DECL_THREAD_LOCAL_P (decl
)));
5438 if (TREE_ASM_WRITTEN (decl
))
5441 /* We must force creation of DECL_RTL for debug info generation, even though
5442 we don't use it here. */
5443 make_decl_rtl (decl
);
5445 TREE_ASM_WRITTEN (decl
) = 1;
5446 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5448 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5450 ultimate_transparent_alias_target (&target
);
5452 if (!TREE_SYMBOL_REFERENCED (target
))
5453 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5455 #ifdef ASM_OUTPUT_WEAKREF
5456 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5457 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5458 IDENTIFIER_POINTER (target
));
5460 if (!TARGET_SUPPORTS_WEAK
)
5462 error_at (DECL_SOURCE_LOCATION (decl
),
5463 "weakref is not supported in this configuration");
5470 #ifdef ASM_OUTPUT_DEF
5471 /* Make name accessible from other files, if appropriate. */
5473 if (TREE_PUBLIC (decl
))
5475 globalize_decl (decl
);
5476 maybe_assemble_visibility (decl
);
5478 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5480 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE) && HAVE_GNU_INDIRECT_FUNCTION
5481 ASM_OUTPUT_TYPE_DIRECTIVE
5482 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5485 error_at (DECL_SOURCE_LOCATION (decl
),
5486 "ifunc is not supported in this configuration");
5490 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5491 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5493 ASM_OUTPUT_DEF (asm_out_file
,
5494 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5495 IDENTIFIER_POINTER (target
));
5497 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5502 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5503 # ifdef ASM_WEAKEN_DECL
5504 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5506 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5508 /* Remove this function from the pending weak list so that
5509 we do not emit multiple .weak directives for it. */
5510 for (p
= &weak_decls
; (t
= *p
) ; )
5511 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5512 *p
= TREE_CHAIN (t
);
5514 p
= &TREE_CHAIN (t
);
5516 /* Remove weakrefs to the same target from the pending weakref
5517 list, for the same reason. */
5518 for (p
= &weakref_targets
; (t
= *p
) ; )
5520 if (DECL_ASSEMBLER_NAME (decl
)
5521 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5522 *p
= TREE_CHAIN (t
);
5524 p
= &TREE_CHAIN (t
);
5530 /* Emit an assembler directive to make the symbol for DECL an alias to
5531 the symbol for TARGET. */
5534 assemble_alias (tree decl
, tree target
)
5538 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5540 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5542 ultimate_transparent_alias_target (&target
);
5544 if (alias
== target
)
5545 error ("weakref %q+D ultimately targets itself", decl
);
5548 #ifndef ASM_OUTPUT_WEAKREF
5549 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5550 TREE_CHAIN (alias
) = target
;
5553 if (TREE_PUBLIC (decl
))
5554 error ("weakref %q+D must have static linkage", decl
);
5558 #if !defined (ASM_OUTPUT_DEF)
5559 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5560 error_at (DECL_SOURCE_LOCATION (decl
),
5561 "alias definitions not supported in this configuration");
5564 if (!DECL_WEAK (decl
))
5566 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5567 error_at (DECL_SOURCE_LOCATION (decl
),
5568 "ifunc is not supported in this configuration");
5570 error_at (DECL_SOURCE_LOCATION (decl
),
5571 "only weak aliases are supported in this configuration");
5577 TREE_USED (decl
) = 1;
5579 /* Allow aliases to aliases. */
5580 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5581 cgraph_get_create_node (decl
)->alias
= true;
5583 varpool_node_for_decl (decl
)->alias
= true;
5585 /* If the target has already been emitted, we don't have to queue the
5586 alias. This saves a tad of memory. */
5587 if (cgraph_global_info_ready
)
5588 target_decl
= find_decl (target
);
5591 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5592 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5593 do_assemble_alias (decl
, target
);
5596 alias_pair p
= {decl
, target
};
5597 vec_safe_push (alias_pairs
, p
);
5601 /* Record and output a table of translations from original function
5602 to its transaction aware clone. Note that tm_pure functions are
5603 considered to be their own clone. */
5605 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5606 htab_t tm_clone_hash
;
5609 record_tm_clone_pair (tree o
, tree n
)
5611 struct tree_map
**slot
, *h
;
5613 if (tm_clone_hash
== NULL
)
5614 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5616 h
= ggc_alloc_tree_map ();
5617 h
->hash
= htab_hash_pointer (o
);
5621 slot
= (struct tree_map
**)
5622 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5627 get_tm_clone_pair (tree o
)
5631 struct tree_map
*h
, in
;
5634 in
.hash
= htab_hash_pointer (o
);
5635 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5643 typedef struct tm_alias_pair
5651 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5652 into a VEC in INFO. */
5655 dump_tm_clone_to_vec (void **slot
, void *info
)
5657 struct tree_map
*map
= (struct tree_map
*) *slot
;
5658 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5659 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5660 tm_alias_pairs
->safe_push (p
);
5664 /* Dump the actual pairs to the .tm_clone_table section. */
5667 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5671 bool switched
= false;
5673 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5677 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5678 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5680 /* The function ipa_tm_create_version() marks the clone as needed if
5681 the original function was needed. But we also mark the clone as
5682 needed if we ever called the clone indirectly through
5683 TM_GETTMCLONE. If neither of these are true, we didn't generate
5684 a clone, and we didn't call it indirectly... no sense keeping it
5685 in the clone table. */
5686 if (!dst_n
|| !dst_n
->analyzed
)
5689 /* This covers the case where we have optimized the original
5690 function away, and only access the transactional clone. */
5691 if (!src_n
|| !src_n
->analyzed
)
5696 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5697 assemble_align (POINTER_SIZE
);
5701 assemble_integer (XEXP (DECL_RTL (src
), 0),
5702 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5703 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5704 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5708 /* Provide a default for the tm_clone_table section. */
5711 default_clone_table_section (void)
5713 return get_named_section (NULL
, ".tm_clone_table", 3);
5716 /* Helper comparison function for qsorting by the DECL_UID stored in
5717 alias_pair->emitted_diags. */
5720 tm_alias_pair_cmp (const void *x
, const void *y
)
5722 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5723 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5724 if (p1
->uid
< p2
->uid
)
5726 if (p1
->uid
> p2
->uid
)
5732 finish_tm_clone_pairs (void)
5734 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5736 if (tm_clone_hash
== NULL
)
5739 /* We need a determenistic order for the .tm_clone_table, otherwise
5740 we will get bootstrap comparison failures, so dump the hash table
5741 to a vector, sort it, and dump the vector. */
5743 /* Dump the hashtable to a vector. */
5744 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5745 (void *) &tm_alias_pairs
);
5747 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5750 dump_tm_clone_pairs (tm_alias_pairs
);
5752 htab_delete (tm_clone_hash
);
5753 tm_clone_hash
= NULL
;
5754 tm_alias_pairs
.release ();
5758 /* Emit an assembler directive to set symbol for DECL visibility to
5759 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5762 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5763 int vis ATTRIBUTE_UNUSED
)
5765 #ifdef HAVE_GAS_HIDDEN
5766 static const char * const visibility_types
[] = {
5767 NULL
, "protected", "hidden", "internal"
5770 const char *name
, *type
;
5772 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5773 type
= visibility_types
[vis
];
5775 fprintf (asm_out_file
, "\t.%s\t", type
);
5776 assemble_name (asm_out_file
, name
);
5777 fprintf (asm_out_file
, "\n");
5779 warning (OPT_Wattributes
, "visibility attribute not supported "
5780 "in this configuration; ignored");
5784 /* A helper function to call assemble_visibility when needed for a decl. */
5787 maybe_assemble_visibility (tree decl
)
5789 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5791 if (vis
!= VISIBILITY_DEFAULT
)
5793 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5800 /* Returns 1 if the target configuration supports defining public symbols
5801 so that one of them will be chosen at link time instead of generating a
5802 multiply-defined symbol error, whether through the use of weak symbols or
5803 a target-specific mechanism for having duplicates discarded. */
5806 supports_one_only (void)
5808 if (SUPPORTS_ONE_ONLY
)
5810 return TARGET_SUPPORTS_WEAK
;
5813 /* Set up DECL as a public symbol that can be defined in multiple
5814 translation units without generating a linker error. */
5817 make_decl_one_only (tree decl
, tree comdat_group
)
5819 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5820 || TREE_CODE (decl
) == FUNCTION_DECL
);
5822 TREE_PUBLIC (decl
) = 1;
5824 if (SUPPORTS_ONE_ONLY
)
5826 #ifdef MAKE_DECL_ONE_ONLY
5827 MAKE_DECL_ONE_ONLY (decl
);
5829 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5831 else if (TREE_CODE (decl
) == VAR_DECL
5832 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5833 DECL_COMMON (decl
) = 1;
5836 gcc_assert (TARGET_SUPPORTS_WEAK
);
5837 DECL_WEAK (decl
) = 1;
5842 init_varasm_once (void)
5844 section_htab
= htab_create_ggc (31, section_entry_hash
,
5845 section_entry_eq
, NULL
);
5846 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5847 object_block_entry_eq
, NULL
);
5848 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5849 const_desc_eq
, NULL
);
5851 const_alias_set
= new_alias_set ();
5852 shared_constant_pool
= create_constant_pool ();
5854 #ifdef TEXT_SECTION_ASM_OP
5855 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5856 TEXT_SECTION_ASM_OP
);
5859 #ifdef DATA_SECTION_ASM_OP
5860 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5861 DATA_SECTION_ASM_OP
);
5864 #ifdef SDATA_SECTION_ASM_OP
5865 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5866 SDATA_SECTION_ASM_OP
);
5869 #ifdef READONLY_DATA_SECTION_ASM_OP
5870 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5871 READONLY_DATA_SECTION_ASM_OP
);
5874 #ifdef CTORS_SECTION_ASM_OP
5875 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5876 CTORS_SECTION_ASM_OP
);
5879 #ifdef DTORS_SECTION_ASM_OP
5880 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5881 DTORS_SECTION_ASM_OP
);
5884 #ifdef BSS_SECTION_ASM_OP
5885 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5886 output_section_asm_op
,
5887 BSS_SECTION_ASM_OP
);
5890 #ifdef SBSS_SECTION_ASM_OP
5891 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5892 output_section_asm_op
,
5893 SBSS_SECTION_ASM_OP
);
5896 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5897 | SECTION_COMMON
, emit_tls_common
);
5898 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5899 | SECTION_COMMON
, emit_local
);
5900 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5901 | SECTION_COMMON
, emit_common
);
5903 #if defined ASM_OUTPUT_ALIGNED_BSS
5904 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5908 targetm
.asm_out
.init_sections ();
5910 if (readonly_data_section
== NULL
)
5911 readonly_data_section
= text_section
;
5913 #ifdef ASM_OUTPUT_EXTERNAL
5914 pending_assemble_externals_set
= pointer_set_create ();
5919 decl_default_tls_model (const_tree decl
)
5921 enum tls_model kind
;
5924 is_local
= targetm
.binds_local_p (decl
);
5928 kind
= TLS_MODEL_LOCAL_EXEC
;
5930 kind
= TLS_MODEL_INITIAL_EXEC
;
5933 /* Local dynamic is inefficient when we're not combining the
5934 parts of the address. */
5935 else if (optimize
&& is_local
)
5936 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5938 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5939 if (kind
< flag_tls_default
)
5940 kind
= flag_tls_default
;
5945 /* Select a set of attributes for section NAME based on the properties
5946 of DECL and whether or not RELOC indicates that DECL's initializer
5947 might contain runtime relocations.
5949 We make the section read-only and executable for a function decl,
5950 read-only for a const data decl, and writable for a non-const data decl. */
5953 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5957 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5958 flags
= SECTION_CODE
;
5961 enum section_category category
5962 = categorize_decl_for_section (decl
, reloc
);
5963 if (decl_readonly_section_1 (category
))
5965 else if (category
== SECCAT_DATA_REL_RO
5966 || category
== SECCAT_DATA_REL_RO_LOCAL
)
5967 flags
= SECTION_WRITE
| SECTION_RELRO
;
5969 flags
= SECTION_WRITE
;
5973 flags
= SECTION_WRITE
;
5974 if (strcmp (name
, ".data.rel.ro") == 0
5975 || strcmp (name
, ".data.rel.ro.local") == 0)
5976 flags
|= SECTION_RELRO
;
5979 if (decl
&& DECL_ONE_ONLY (decl
))
5980 flags
|= SECTION_LINKONCE
;
5982 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5983 flags
|= SECTION_TLS
| SECTION_WRITE
;
5985 if (strcmp (name
, ".bss") == 0
5986 || strncmp (name
, ".bss.", 5) == 0
5987 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
5988 || strcmp (name
, ".sbss") == 0
5989 || strncmp (name
, ".sbss.", 6) == 0
5990 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
5991 flags
|= SECTION_BSS
;
5993 if (strcmp (name
, ".tdata") == 0
5994 || strncmp (name
, ".tdata.", 7) == 0
5995 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
5996 flags
|= SECTION_TLS
;
5998 if (strcmp (name
, ".tbss") == 0
5999 || strncmp (name
, ".tbss.", 6) == 0
6000 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6001 flags
|= SECTION_TLS
| SECTION_BSS
;
6003 /* These three sections have special ELF types. They are neither
6004 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6005 want to print a section type (@progbits or @nobits). If someone
6006 is silly enough to emit code or TLS variables to one of these
6007 sections, then don't handle them specially. */
6008 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6009 && (strcmp (name
, ".init_array") == 0
6010 || strcmp (name
, ".fini_array") == 0
6011 || strcmp (name
, ".preinit_array") == 0))
6012 flags
|= SECTION_NOTYPE
;
6017 /* Return true if the target supports some form of global BSS,
6018 either through bss_noswitch_section, or by selecting a BSS
6019 section in TARGET_ASM_SELECT_SECTION. */
6022 have_global_bss_p (void)
6024 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6027 /* Output assembly to switch to section NAME with attribute FLAGS.
6028 Four variants for common object file formats. */
6031 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6032 unsigned int flags ATTRIBUTE_UNUSED
,
6033 tree decl ATTRIBUTE_UNUSED
)
6035 /* Some object formats don't support named sections at all. The
6036 front-end should already have flagged this as an error. */
6040 #ifndef TLS_SECTION_ASM_FLAG
6041 #define TLS_SECTION_ASM_FLAG 'T'
6045 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6046 tree decl ATTRIBUTE_UNUSED
)
6048 char flagchars
[10], *f
= flagchars
;
6050 /* If we have already declared this section, we can use an
6051 abbreviated form to switch back to it -- unless this section is
6052 part of a COMDAT groups, in which case GAS requires the full
6053 declaration every time. */
6054 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6055 && (flags
& SECTION_DECLARED
))
6057 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6061 if (!(flags
& SECTION_DEBUG
))
6063 if (flags
& SECTION_EXCLUDE
)
6065 if (flags
& SECTION_WRITE
)
6067 if (flags
& SECTION_CODE
)
6069 if (flags
& SECTION_SMALL
)
6071 if (flags
& SECTION_MERGE
)
6073 if (flags
& SECTION_STRINGS
)
6075 if (flags
& SECTION_TLS
)
6076 *f
++ = TLS_SECTION_ASM_FLAG
;
6077 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6081 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6083 if (!(flags
& SECTION_NOTYPE
))
6088 if (flags
& SECTION_BSS
)
6094 /* On platforms that use "@" as the assembly comment character,
6096 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6098 fprintf (asm_out_file
, format
, type
);
6100 if (flags
& SECTION_ENTSIZE
)
6101 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6102 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6104 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6105 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6107 fprintf (asm_out_file
, ",%s,comdat",
6108 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6112 putc ('\n', asm_out_file
);
6116 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6117 tree decl ATTRIBUTE_UNUSED
)
6119 char flagchars
[8], *f
= flagchars
;
6121 if (flags
& SECTION_WRITE
)
6123 if (flags
& SECTION_CODE
)
6127 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6131 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6134 default_coff_asm_named_section (name
, flags
, decl
);
6136 if (flags
& SECTION_LINKONCE
)
6138 /* Functions may have been compiled at various levels of
6139 optimization so we can't use `same_size' here.
6140 Instead, have the linker pick one. */
6141 fprintf (asm_out_file
, "\t.linkonce %s\n",
6142 (flags
& SECTION_CODE
? "discard" : "same_size"));
6146 /* The lame default section selector. */
6149 default_select_section (tree decl
, int reloc
,
6150 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6154 if (decl_readonly_section (decl
, reloc
))
6155 return readonly_data_section
;
6157 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6159 if (! ((flag_pic
&& reloc
)
6160 || !TREE_READONLY (decl
)
6161 || TREE_SIDE_EFFECTS (decl
)
6162 || !TREE_CONSTANT (decl
)))
6163 return readonly_data_section
;
6165 else if (TREE_CODE (decl
) == STRING_CST
)
6166 return readonly_data_section
;
6167 else if (! (flag_pic
&& reloc
))
6168 return readonly_data_section
;
6170 return data_section
;
6173 enum section_category
6174 categorize_decl_for_section (const_tree decl
, int reloc
)
6176 enum section_category ret
;
6178 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6180 else if (TREE_CODE (decl
) == STRING_CST
)
6183 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6184 /* or !flag_merge_constants */
6185 return SECCAT_RODATA
;
6187 return SECCAT_RODATA_MERGE_STR
;
6189 else if (TREE_CODE (decl
) == VAR_DECL
)
6191 if (bss_initializer_p (decl
))
6193 else if (! TREE_READONLY (decl
)
6194 || TREE_SIDE_EFFECTS (decl
)
6195 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6197 /* Here the reloc_rw_mask is not testing whether the section should
6198 be read-only or not, but whether the dynamic link will have to
6199 do something. If so, we wish to segregate the data in order to
6200 minimize cache misses inside the dynamic linker. */
6201 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6202 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6206 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6207 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6208 else if (reloc
|| flag_merge_constants
< 2 || flag_mudflap
6209 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6210 /* C and C++ don't allow different variables to share the same
6211 location. -fmerge-all-constants allows even that (at the
6212 expense of not conforming). */
6213 ret
= SECCAT_RODATA
;
6214 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6215 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6217 ret
= SECCAT_RODATA_MERGE_CONST
;
6219 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6221 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6222 || TREE_SIDE_EFFECTS (decl
)
6223 || ! TREE_CONSTANT (decl
))
6226 ret
= SECCAT_RODATA
;
6229 ret
= SECCAT_RODATA
;
6231 /* There are no read-only thread-local sections. */
6232 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6234 /* Note that this would be *just* SECCAT_BSS, except that there's
6235 no concept of a read-only thread-local-data section. */
6236 if (ret
== SECCAT_BSS
6237 || (flag_zero_initialized_in_bss
6238 && initializer_zerop (DECL_INITIAL (decl
))))
6244 /* If the target uses small data sections, select it. */
6245 else if (targetm
.in_small_data_p (decl
))
6247 if (ret
== SECCAT_BSS
)
6249 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6250 ret
= SECCAT_SRODATA
;
6259 decl_readonly_section_1 (enum section_category category
)
6264 case SECCAT_RODATA_MERGE_STR
:
6265 case SECCAT_RODATA_MERGE_STR_INIT
:
6266 case SECCAT_RODATA_MERGE_CONST
:
6267 case SECCAT_SRODATA
:
6275 decl_readonly_section (const_tree decl
, int reloc
)
6277 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6280 /* Select a section based on the above categorization. */
6283 default_elf_select_section (tree decl
, int reloc
,
6284 unsigned HOST_WIDE_INT align
)
6287 switch (categorize_decl_for_section (decl
, reloc
))
6290 /* We're not supposed to be called on FUNCTION_DECLs. */
6293 return readonly_data_section
;
6294 case SECCAT_RODATA_MERGE_STR
:
6295 return mergeable_string_section (decl
, align
, 0);
6296 case SECCAT_RODATA_MERGE_STR_INIT
:
6297 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6298 case SECCAT_RODATA_MERGE_CONST
:
6299 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6300 case SECCAT_SRODATA
:
6304 return data_section
;
6305 case SECCAT_DATA_REL
:
6306 sname
= ".data.rel";
6308 case SECCAT_DATA_REL_LOCAL
:
6309 sname
= ".data.rel.local";
6311 case SECCAT_DATA_REL_RO
:
6312 sname
= ".data.rel.ro";
6314 case SECCAT_DATA_REL_RO_LOCAL
:
6315 sname
= ".data.rel.ro.local";
6340 return get_named_section (decl
, sname
, reloc
);
6343 /* Construct a unique section name based on the decl name and the
6344 categorization performed above. */
6347 default_unique_section (tree decl
, int reloc
)
6349 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6350 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6351 const char *prefix
, *name
, *linkonce
;
6354 switch (categorize_decl_for_section (decl
, reloc
))
6357 prefix
= one_only
? ".t" : ".text";
6360 case SECCAT_RODATA_MERGE_STR
:
6361 case SECCAT_RODATA_MERGE_STR_INIT
:
6362 case SECCAT_RODATA_MERGE_CONST
:
6363 prefix
= one_only
? ".r" : ".rodata";
6365 case SECCAT_SRODATA
:
6366 prefix
= one_only
? ".s2" : ".sdata2";
6369 prefix
= one_only
? ".d" : ".data";
6371 case SECCAT_DATA_REL
:
6372 prefix
= one_only
? ".d.rel" : ".data.rel";
6374 case SECCAT_DATA_REL_LOCAL
:
6375 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6377 case SECCAT_DATA_REL_RO
:
6378 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6380 case SECCAT_DATA_REL_RO_LOCAL
:
6381 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6384 prefix
= one_only
? ".s" : ".sdata";
6387 prefix
= one_only
? ".b" : ".bss";
6390 prefix
= one_only
? ".sb" : ".sbss";
6393 prefix
= one_only
? ".td" : ".tdata";
6396 prefix
= one_only
? ".tb" : ".tbss";
6402 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6403 name
= targetm
.strip_name_encoding (name
);
6405 /* If we're using one_only, then there needs to be a .gnu.linkonce
6406 prefix to the section name. */
6407 linkonce
= one_only
? ".gnu.linkonce" : "";
6409 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6411 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6414 /* Like compute_reloc_for_constant, except for an RTX. The return value
6415 is a mask for which bit 1 indicates a global relocation, and bit 0
6416 indicates a local relocation. */
6419 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6421 int *preloc
= (int *) data
;
6424 switch (GET_CODE (x
))
6427 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6440 compute_reloc_for_rtx (rtx x
)
6444 switch (GET_CODE (x
))
6450 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6459 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6461 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6463 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6464 return data_section
;
6466 return readonly_data_section
;
6470 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6471 unsigned HOST_WIDE_INT align
)
6473 int reloc
= compute_reloc_for_rtx (x
);
6475 /* ??? Handle small data here somehow. */
6477 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6480 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6482 return get_named_section (NULL
, ".data.rel.ro", 3);
6485 return mergeable_constant_section (mode
, align
, 0);
6488 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6491 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6496 /* Careful not to prod global register variables. */
6499 symbol
= XEXP (rtl
, 0);
6500 if (GET_CODE (symbol
) != SYMBOL_REF
)
6503 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6504 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6505 flags
|= SYMBOL_FLAG_FUNCTION
;
6506 if (targetm
.binds_local_p (decl
))
6507 flags
|= SYMBOL_FLAG_LOCAL
;
6508 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6509 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6510 else if (targetm
.in_small_data_p (decl
))
6511 flags
|= SYMBOL_FLAG_SMALL
;
6512 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6513 being PUBLIC, the thing *must* be defined in this translation unit.
6514 Prevent this buglet from being propagated into rtl code as well. */
6515 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6516 flags
|= SYMBOL_FLAG_EXTERNAL
;
6518 SYMBOL_REF_FLAGS (symbol
) = flags
;
6521 /* By default, we do nothing for encode_section_info, so we need not
6522 do anything but discard the '*' marker. */
6525 default_strip_name_encoding (const char *str
)
6527 return str
+ (*str
== '*');
6530 #ifdef ASM_OUTPUT_DEF
6531 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6532 anchor relative to ".", the current section position. */
6535 default_asm_output_anchor (rtx symbol
)
6539 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6540 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6541 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6545 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6548 default_use_anchors_for_symbol_p (const_rtx symbol
)
6553 /* Don't use anchors for mergeable sections. The linker might move
6554 the objects around. */
6555 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6556 if (sect
->common
.flags
& SECTION_MERGE
)
6559 /* Don't use anchors for small data sections. The small data register
6560 acts as an anchor for such sections. */
6561 if (sect
->common
.flags
& SECTION_SMALL
)
6564 decl
= SYMBOL_REF_DECL (symbol
);
6565 if (decl
&& DECL_P (decl
))
6567 /* Don't use section anchors for decls that might be defined by
6569 if (!targetm
.binds_local_p (decl
))
6572 /* Don't use section anchors for decls that will be placed in a
6573 small data section. */
6574 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6575 one above. The problem is that we only use SECTION_SMALL for
6576 sections that should be marked as small in the section directive. */
6577 if (targetm
.in_small_data_p (decl
))
6583 /* Return true when RESOLUTION indicate that symbol will be bound to the
6584 definition provided by current .o file. */
6587 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6589 return (resolution
== LDPR_PREVAILING_DEF
6590 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6591 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6594 /* Return true when RESOLUTION indicate that symbol will be bound locally
6595 within current executable or DSO. */
6598 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6600 return (resolution
== LDPR_PREVAILING_DEF
6601 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6602 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6603 || resolution
== LDPR_PREEMPTED_REG
6604 || resolution
== LDPR_PREEMPTED_IR
6605 || resolution
== LDPR_RESOLVED_IR
6606 || resolution
== LDPR_RESOLVED_EXEC
);
6609 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6610 wrt cross-module name binding. */
6613 default_binds_local_p (const_tree exp
)
6615 return default_binds_local_p_1 (exp
, flag_shlib
);
6619 default_binds_local_p_1 (const_tree exp
, int shlib
)
6622 bool resolved_locally
= false;
6623 bool resolved_to_local_def
= false;
6625 /* With resolution file in hands, take look into resolutions.
6626 We can't just return true for resolved_locally symbols,
6627 because dynamic linking might overwrite symbols
6628 in shared libraries. */
6629 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6630 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6632 struct varpool_node
*vnode
= varpool_get_node (exp
);
6633 if (vnode
&& resolution_local_p (vnode
->symbol
.resolution
))
6634 resolved_locally
= true;
6636 && resolution_to_local_definition_p (vnode
->symbol
.resolution
))
6637 resolved_to_local_def
= true;
6639 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6641 struct cgraph_node
*node
= cgraph_get_node (exp
);
6643 && resolution_local_p (node
->symbol
.resolution
))
6644 resolved_locally
= true;
6646 && resolution_to_local_definition_p (node
->symbol
.resolution
))
6647 resolved_to_local_def
= true;
6650 /* A non-decl is an entry in the constant pool. */
6653 /* Weakrefs may not bind locally, even though the weakref itself is always
6654 static and therefore local. Similarly, the resolver for ifunc functions
6655 might resolve to a non-local function.
6656 FIXME: We can resolve the weakref case more curefuly by looking at the
6658 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6659 || (TREE_CODE (exp
) == FUNCTION_DECL
6660 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6662 /* Static variables are always local. */
6663 else if (! TREE_PUBLIC (exp
))
6665 /* A variable is local if the user has said explicitly that it will
6667 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6668 || resolved_to_local_def
)
6669 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6671 /* Variables defined outside this object might not be local. */
6672 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6674 /* If defined in this object and visibility is not default, must be
6676 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6678 /* Default visibility weak data can be overridden by a strong symbol
6679 in another module and so are not local. */
6680 else if (DECL_WEAK (exp
)
6681 && !resolved_locally
)
6683 /* If PIC, then assume that any global name can be overridden by
6684 symbols resolved from other modules. */
6687 /* Uninitialized COMMON variable may be unified with symbols
6688 resolved from other modules. */
6689 else if (DECL_COMMON (exp
)
6690 && !resolved_locally
6691 && (DECL_INITIAL (exp
) == NULL
6692 || DECL_INITIAL (exp
) == error_mark_node
))
6694 /* Otherwise we're left with initialized (or non-common) global data
6695 which is of necessity defined locally. */
6702 /* Return true when references to DECL must bind to current definition in
6705 The condition is usually equivalent to whether the function binds to the
6706 current module (shared library or executable), that is to binds_local_p.
6707 We use this fact to avoid need for another target hook and implement
6708 the logic using binds_local_p and just special cases where
6709 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6710 the weak definitions (that can be overwritten at linktime by other
6711 definition from different object file) and when resolution info is available
6712 we simply use the knowledge passed to us by linker plugin. */
6714 decl_binds_to_current_def_p (tree decl
)
6716 gcc_assert (DECL_P (decl
));
6717 if (!TREE_PUBLIC (decl
))
6719 if (!targetm
.binds_local_p (decl
))
6721 /* When resolution is available, just use it. */
6722 if (TREE_CODE (decl
) == VAR_DECL
6723 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6725 struct varpool_node
*vnode
= varpool_get_node (decl
);
6727 && vnode
->symbol
.resolution
!= LDPR_UNKNOWN
)
6728 return resolution_to_local_definition_p (vnode
->symbol
.resolution
);
6730 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6732 struct cgraph_node
*node
= cgraph_get_node (decl
);
6734 && node
->symbol
.resolution
!= LDPR_UNKNOWN
)
6735 return resolution_to_local_definition_p (node
->symbol
.resolution
);
6737 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6738 binds locally but still can be overwritten).
6739 This rely on fact that binds_local_p behave as decl_replaceable_p
6740 for all other declaration types. */
6741 return !DECL_WEAK (decl
);
6744 /* A replaceable function or variable is one which may be replaced
6745 at link-time with an entirely different definition, provided that the
6746 replacement has the same type. For example, functions declared
6747 with __attribute__((weak)) on most systems are replaceable.
6749 COMDAT functions are not replaceable, since all definitions of the
6750 function must be equivalent. It is important that COMDAT functions
6751 not be treated as replaceable so that use of C++ template
6752 instantiations is not penalized. */
6755 decl_replaceable_p (tree decl
)
6757 gcc_assert (DECL_P (decl
));
6758 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6760 return !decl_binds_to_current_def_p (decl
);
6763 /* Default function to output code that will globalize a label. A
6764 target must define GLOBAL_ASM_OP or provide its own function to
6765 globalize a label. */
6766 #ifdef GLOBAL_ASM_OP
6768 default_globalize_label (FILE * stream
, const char *name
)
6770 fputs (GLOBAL_ASM_OP
, stream
);
6771 assemble_name (stream
, name
);
6772 putc ('\n', stream
);
6774 #endif /* GLOBAL_ASM_OP */
6776 /* Default function to output code that will globalize a declaration. */
6778 default_globalize_decl_name (FILE * stream
, tree decl
)
6780 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6781 targetm
.asm_out
.globalize_label (stream
, name
);
6784 /* Default function to output a label for unwind information. The
6785 default is to do nothing. A target that needs nonlocal labels for
6786 unwind information must provide its own function to do this. */
6788 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6789 tree decl ATTRIBUTE_UNUSED
,
6790 int for_eh ATTRIBUTE_UNUSED
,
6791 int empty ATTRIBUTE_UNUSED
)
6795 /* Default function to output a label to divide up the exception table.
6796 The default is to do nothing. A target that needs/wants to divide
6797 up the table must provide it's own function to do this. */
6799 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6803 /* This is how to output an internal numbered label where PREFIX is
6804 the class of label and LABELNO is the number within the class. */
6807 default_generate_internal_label (char *buf
, const char *prefix
,
6808 unsigned long labelno
)
6810 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6813 /* This is how to output an internal numbered label where PREFIX is
6814 the class of label and LABELNO is the number within the class. */
6817 default_internal_label (FILE *stream
, const char *prefix
,
6818 unsigned long labelno
)
6820 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6821 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6822 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6826 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6829 default_asm_declare_constant_name (FILE *file
, const char *name
,
6830 const_tree exp ATTRIBUTE_UNUSED
,
6831 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6833 assemble_label (file
, name
);
6836 /* This is the default behavior at the beginning of a file. It's
6837 controlled by two other target-hook toggles. */
6839 default_file_start (void)
6841 if (targetm
.asm_file_start_app_off
6842 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6843 fputs (ASM_APP_OFF
, asm_out_file
);
6845 if (targetm
.asm_file_start_file_directive
)
6846 output_file_directive (asm_out_file
, main_input_filename
);
6849 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6850 which emits a special section directive used to indicate whether or
6851 not this object file needs an executable stack. This is primarily
6852 a GNU extension to ELF but could be used on other targets. */
6854 int trampolines_created
;
6857 file_end_indicate_exec_stack (void)
6859 unsigned int flags
= SECTION_DEBUG
;
6860 if (trampolines_created
)
6861 flags
|= SECTION_CODE
;
6863 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6866 /* Emit a special section directive to indicate that this object file
6867 was compiled with -fsplit-stack. This is used to let the linker
6868 detect calls between split-stack code and non-split-stack code, so
6869 that it can modify the split-stack code to allocate a sufficiently
6870 large stack. We emit another special section if there are any
6871 functions in this file which have the no_split_stack attribute, to
6872 prevent the linker from warning about being unable to convert the
6873 functions if they call non-split-stack code. */
6876 file_end_indicate_split_stack (void)
6878 if (flag_split_stack
)
6880 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6882 if (saw_no_split_stack
)
6883 switch_to_section (get_section (".note.GNU-no-split-stack",
6884 SECTION_DEBUG
, NULL
));
6888 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6889 a get_unnamed_section callback. */
6892 output_section_asm_op (const void *directive
)
6894 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6897 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6898 the current section is NEW_SECTION. */
6901 switch_to_section (section
*new_section
)
6903 if (in_section
== new_section
)
6906 if (new_section
->common
.flags
& SECTION_FORGET
)
6909 in_section
= new_section
;
6911 switch (SECTION_STYLE (new_section
))
6914 targetm
.asm_out
.named_section (new_section
->named
.name
,
6915 new_section
->named
.common
.flags
,
6916 new_section
->named
.decl
);
6919 case SECTION_UNNAMED
:
6920 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6923 case SECTION_NOSWITCH
:
6928 new_section
->common
.flags
|= SECTION_DECLARED
;
6931 /* If block symbol SYMBOL has not yet been assigned an offset, place
6932 it at the end of its block. */
6935 place_block_symbol (rtx symbol
)
6937 unsigned HOST_WIDE_INT size
, mask
, offset
;
6938 struct constant_descriptor_rtx
*desc
;
6939 unsigned int alignment
;
6940 struct object_block
*block
;
6943 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6944 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6947 /* Work out the symbol's size and alignment. */
6948 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6950 desc
= SYMBOL_REF_CONSTANT (symbol
);
6951 alignment
= desc
->align
;
6952 size
= GET_MODE_SIZE (desc
->mode
);
6954 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6956 decl
= SYMBOL_REF_DECL (symbol
);
6957 alignment
= DECL_ALIGN (decl
);
6958 size
= get_constant_size (DECL_INITIAL (decl
));
6962 decl
= SYMBOL_REF_DECL (symbol
);
6963 alignment
= DECL_ALIGN (decl
);
6964 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6965 if (flag_asan
&& asan_protect_global (decl
))
6966 size
+= asan_red_zone_size (size
);
6969 /* Calculate the object's offset from the start of the block. */
6970 block
= SYMBOL_REF_BLOCK (symbol
);
6971 mask
= alignment
/ BITS_PER_UNIT
- 1;
6972 offset
= (block
->size
+ mask
) & ~mask
;
6973 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6975 /* Record the block's new alignment and size. */
6976 block
->alignment
= MAX (block
->alignment
, alignment
);
6977 block
->size
= offset
+ size
;
6979 vec_safe_push (block
->objects
, symbol
);
6982 /* Return the anchor that should be used to address byte offset OFFSET
6983 from the first object in BLOCK. MODEL is the TLS model used
6987 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
6988 enum tls_model model
)
6991 unsigned int begin
, middle
, end
;
6992 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
6995 /* Work out the anchor's offset. Use an offset of 0 for the first
6996 anchor so that we don't pessimize the case where we take the address
6997 of a variable at the beginning of the block. This is particularly
6998 useful when a block has only one variable assigned to it.
7000 We try to place anchors RANGE bytes apart, so there can then be
7001 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7002 a ptr_mode offset. With some target settings, the lowest such
7003 anchor might be out of range for the lowest ptr_mode offset;
7004 likewise the highest anchor for the highest offset. Use anchors
7005 at the extreme ends of the ptr_mode range in such cases.
7007 All arithmetic uses unsigned integers in order to avoid
7009 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7010 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7011 range
= max_offset
- min_offset
+ 1;
7016 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7019 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7020 delta
-= delta
% range
;
7023 offset
= (HOST_WIDE_INT
) (-delta
);
7027 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7028 delta
-= delta
% range
;
7029 if (delta
> bias
- 1)
7031 offset
= (HOST_WIDE_INT
) delta
;
7035 /* Do a binary search to see if there's already an anchor we can use.
7036 Set BEGIN to the new anchor's index if not. */
7038 end
= vec_safe_length (block
->anchors
);
7039 while (begin
!= end
)
7041 middle
= (end
+ begin
) / 2;
7042 anchor
= (*block
->anchors
)[middle
];
7043 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7045 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7047 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7049 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7055 /* Create a new anchor with a unique label. */
7056 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7057 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7058 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7059 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7061 /* Insert it at index BEGIN. */
7062 vec_safe_insert (block
->anchors
, begin
, anchor
);
7066 /* Output the objects in BLOCK. */
7069 output_object_block (struct object_block
*block
)
7071 struct constant_descriptor_rtx
*desc
;
7073 HOST_WIDE_INT offset
;
7077 if (!block
->objects
)
7080 /* Switch to the section and make sure that the first byte is
7081 suitably aligned. */
7082 switch_to_section (block
->sect
);
7083 assemble_align (block
->alignment
);
7085 /* Define the values of all anchors relative to the current section
7087 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7088 targetm
.asm_out
.output_anchor (symbol
);
7090 /* Output the objects themselves. */
7092 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7094 /* Move to the object's offset, padding with zeros if necessary. */
7095 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7096 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7097 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7099 desc
= SYMBOL_REF_CONSTANT (symbol
);
7100 output_constant_pool_1 (desc
, 1);
7101 offset
+= GET_MODE_SIZE (desc
->mode
);
7103 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7105 decl
= SYMBOL_REF_DECL (symbol
);
7106 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7108 offset
+= get_constant_size (DECL_INITIAL (decl
));
7112 decl
= SYMBOL_REF_DECL (symbol
);
7113 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7114 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7119 /* A htab_traverse callback used to call output_object_block for
7120 each member of object_block_htab. */
7123 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7125 output_object_block ((struct object_block
*) (*slot
));
7129 /* Output the definitions of all object_blocks. */
7132 output_object_blocks (void)
7134 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7137 /* This function provides a possible implementation of the
7138 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7139 by -frecord-gcc-switches it creates a new mergeable, string section in the
7140 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7141 contains the switches in ASCII format.
7143 FIXME: This code does not correctly handle double quote characters
7144 that appear inside strings, (it strips them rather than preserving them).
7145 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7146 characters - instead it treats them as sub-string separators. Since
7147 we want to emit NUL strings terminators into the object file we have to use
7151 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7155 case SWITCH_TYPE_PASSED
:
7156 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7157 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7160 case SWITCH_TYPE_DESCRIPTIVE
:
7163 /* Distinguish between invocations where name is NULL. */
7164 static bool started
= false;
7170 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7174 | (SECTION_ENTSIZE
& 1),
7176 switch_to_section (sec
);
7185 /* The return value is currently ignored by the caller, but must be 0.
7186 For -fverbose-asm the return value would be the number of characters
7187 emitted into the assembler file. */
7191 /* Emit text to declare externally defined symbols. It is needed to
7192 properly support non-default visibility. */
7194 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7196 const char *name ATTRIBUTE_UNUSED
)
7198 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7199 set in order to avoid putting out names that are never really
7201 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7202 && targetm
.binds_local_p (decl
))
7203 maybe_assemble_visibility (decl
);
7206 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7209 default_asm_output_source_filename (FILE *file
, const char *name
)
7211 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7212 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7214 fprintf (file
, "\t.file\t");
7215 output_quoted_string (file
, name
);
7220 /* Output a file name in the form wanted by System V. */
7223 output_file_directive (FILE *asm_file
, const char *input_name
)
7228 if (input_name
== NULL
)
7229 input_name
= "<stdin>";
7231 input_name
= remap_debug_filename (input_name
);
7233 len
= strlen (input_name
);
7234 na
= input_name
+ len
;
7236 /* NA gets INPUT_NAME sans directory names. */
7237 while (na
> input_name
)
7239 if (IS_DIR_SEPARATOR (na
[-1]))
7244 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7247 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7250 make_debug_expr_from_rtl (const_rtx exp
)
7252 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7253 enum machine_mode mode
= GET_MODE (exp
);
7256 DECL_ARTIFICIAL (ddecl
) = 1;
7257 if (REG_P (exp
) && REG_EXPR (exp
))
7258 type
= TREE_TYPE (REG_EXPR (exp
));
7259 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7260 type
= TREE_TYPE (MEM_EXPR (exp
));
7263 if (type
&& TYPE_MODE (type
) == mode
)
7264 TREE_TYPE (ddecl
) = type
;
7266 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7267 DECL_MODE (ddecl
) = mode
;
7268 dval
= gen_rtx_DEBUG_EXPR (mode
);
7269 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7270 SET_DECL_RTL (ddecl
, dval
);
7274 #ifdef ELF_ASCII_ESCAPES
7275 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7278 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7283 fputs (STRING_ASM_OP
, f
);
7288 escape
= ELF_ASCII_ESCAPES
[c
];
7295 /* TODO: Print in hex with fast function, important for -flto. */
7296 fprintf (f
, "\\%03o", c
);
7309 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7312 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7314 const char *limit
= s
+ len
;
7315 const char *last_null
= NULL
;
7316 unsigned bytes_in_chunk
= 0;
7320 for (; s
< limit
; s
++)
7324 if (bytes_in_chunk
>= 60)
7333 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7340 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7342 if (bytes_in_chunk
> 0)
7349 default_elf_asm_output_limited_string (f
, s
);
7354 if (bytes_in_chunk
== 0)
7355 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7358 escape
= ELF_ASCII_ESCAPES
[c
];
7366 /* TODO: Print in hex with fast function, important for -flto. */
7367 fprintf (f
, "\\%03o", c
);
7368 bytes_in_chunk
+= 4;
7373 bytes_in_chunk
+= 2;
7380 if (bytes_in_chunk
> 0)
7388 static GTY(()) section
*elf_init_array_section
;
7389 static GTY(()) section
*elf_fini_array_section
;
7392 get_elf_initfini_array_priority_section (int priority
,
7396 if (priority
!= DEFAULT_INIT_PRIORITY
)
7399 sprintf (buf
, "%s.%.5u",
7400 constructor_p
? ".init_array" : ".fini_array",
7402 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7408 if (elf_init_array_section
== NULL
)
7409 elf_init_array_section
7410 = get_section (".init_array",
7411 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7412 sec
= elf_init_array_section
;
7416 if (elf_fini_array_section
== NULL
)
7417 elf_fini_array_section
7418 = get_section (".fini_array",
7419 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7420 sec
= elf_fini_array_section
;
7426 /* Use .init_array section for constructors. */
7429 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7431 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7433 assemble_addr_to_section (symbol
, sec
);
7436 /* Use .fini_array section for destructors. */
7439 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7441 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7443 assemble_addr_to_section (symbol
, sec
);
7446 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7448 This is a bit of a cheat. The real default is a no-op, but this
7449 hook is the default for all targets with a .ident directive. */
7452 default_asm_output_ident_directive (const char *ident_str
)
7454 const char *ident_asm_op
= "\t.ident\t";
7456 /* If we are still in the front end, do not write out the string
7457 to asm_out_file. Instead, add a fake top-level asm statement.
7458 This allows the front ends to use this hook without actually
7459 writing to asm_out_file, to handle #ident or Pragma Ident. */
7460 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7462 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7463 add_asm_node (build_string (strlen (buf
), buf
));
7466 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7469 #include "gt-varasm.h"