1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987, 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997,
3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
4 2010, 2011, 2012 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* This file handles generation of all the assembler code
24 *except* the instructions of a function.
25 This includes declarations of variables and their initial values.
27 We also output the assembler code for constants stored in memory
28 and are responsible for combining constants with the same value. */
32 #include "coretypes.h"
39 #include "hard-reg-set.h"
42 #include "diagnostic-core.h"
45 #include "langhooks.h"
49 #include "common/common-target.h"
50 #include "targhooks.h"
51 #include "tree-mudflap.h"
53 #include "pointer-set.h"
56 #ifdef XCOFF_DEBUGGING_INFO
57 #include "xcoffout.h" /* Needed for external data
58 declarations for e.g. AIX 4.x. */
61 /* The (assembler) name of the first globally-visible object output. */
62 extern GTY(()) const char *first_global_object_name
;
63 extern GTY(()) const char *weak_global_object_name
;
65 const char *first_global_object_name
;
66 const char *weak_global_object_name
;
69 struct constant_descriptor_rtx
;
70 struct rtx_constant_pool
;
72 #define n_deferred_constants (crtl->varasm.deferred_constants)
74 /* Number for making the label on the next
75 constant that is stored in memory. */
77 static GTY(()) int const_labelno
;
79 /* Carry information from ASM_DECLARE_OBJECT_NAME
80 to ASM_FINISH_DECLARE_OBJECT. */
82 int size_directive_output
;
84 /* The last decl for which assemble_variable was called,
85 if it did ASM_DECLARE_OBJECT_NAME.
86 If the last call to assemble_variable didn't do that,
89 tree last_assemble_variable_decl
;
91 /* The following global variable indicates if the first basic block
92 in a function belongs to the cold partition or not. */
94 bool first_function_block_is_cold
;
96 /* We give all constants their own alias set. Perhaps redundant with
97 MEM_READONLY_P, but pre-dates it. */
99 static alias_set_type const_alias_set
;
101 /* Whether we saw any functions with no_split_stack. */
103 static bool saw_no_split_stack
;
105 static const char *strip_reg_name (const char *);
106 static int contains_pointers_p (tree
);
107 #ifdef ASM_OUTPUT_EXTERNAL
108 static bool incorporeal_function_p (tree
);
110 static void decode_addr_const (tree
, struct addr_const
*);
111 static hashval_t
const_desc_hash (const void *);
112 static int const_desc_eq (const void *, const void *);
113 static hashval_t
const_hash_1 (const tree
);
114 static int compare_constant (const tree
, const tree
);
115 static tree
copy_constant (tree
);
116 static void output_constant_def_contents (rtx
);
117 static void output_addressed_constants (tree
);
118 static unsigned HOST_WIDE_INT
array_size_for_constructor (tree
);
119 static unsigned min_align (unsigned, unsigned);
120 static void globalize_decl (tree
);
121 static bool decl_readonly_section_1 (enum section_category
);
122 #ifdef BSS_SECTION_ASM_OP
123 #ifdef ASM_OUTPUT_ALIGNED_BSS
124 static void asm_output_aligned_bss (FILE *, tree
, const char *,
125 unsigned HOST_WIDE_INT
, int)
128 #endif /* BSS_SECTION_ASM_OP */
129 static void mark_weak (tree
);
130 static void output_constant_pool (const char *, tree
);
132 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
133 section
*text_section
;
134 section
*data_section
;
135 section
*readonly_data_section
;
136 section
*sdata_section
;
137 section
*ctors_section
;
138 section
*dtors_section
;
139 section
*bss_section
;
140 section
*sbss_section
;
142 /* Various forms of common section. All are guaranteed to be nonnull. */
143 section
*tls_comm_section
;
144 section
*comm_section
;
145 section
*lcomm_section
;
147 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
149 section
*bss_noswitch_section
;
151 /* The section that holds the main exception table, when known. The section
152 is set either by the target's init_sections hook or by the first call to
153 switch_to_exception_section. */
154 section
*exception_section
;
156 /* The section that holds the DWARF2 frame unwind information, when known.
157 The section is set either by the target's init_sections hook or by the
158 first call to switch_to_eh_frame_section. */
159 section
*eh_frame_section
;
161 /* asm_out_file's current section. This is NULL if no section has yet
162 been selected or if we lose track of what the current section is. */
165 /* True if code for the current function is currently being directed
166 at the cold section. */
167 bool in_cold_section_p
;
169 /* A linked list of all the unnamed sections. */
170 static GTY(()) section
*unnamed_sections
;
172 /* Return a nonzero value if DECL has a section attribute. */
173 #define IN_NAMED_SECTION(DECL) \
174 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
175 && DECL_SECTION_NAME (DECL) != NULL_TREE)
177 /* Hash table of named sections. */
178 static GTY((param_is (section
))) htab_t section_htab
;
180 /* A table of object_blocks, indexed by section. */
181 static GTY((param_is (struct object_block
))) htab_t object_block_htab
;
183 /* The next number to use for internal anchor labels. */
184 static GTY(()) int anchor_labelno
;
186 /* A pool of constants that can be shared between functions. */
187 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
189 /* Helper routines for maintaining section_htab. */
192 section_entry_eq (const void *p1
, const void *p2
)
194 const section
*old
= (const section
*) p1
;
195 const char *new_name
= (const char *) p2
;
197 return strcmp (old
->named
.name
, new_name
) == 0;
201 section_entry_hash (const void *p
)
203 const section
*old
= (const section
*) p
;
204 return htab_hash_string (old
->named
.name
);
207 /* Return a hash value for section SECT. */
210 hash_section (section
*sect
)
212 if (sect
->common
.flags
& SECTION_NAMED
)
213 return htab_hash_string (sect
->named
.name
);
214 return sect
->common
.flags
;
217 /* Helper routines for maintaining object_block_htab. */
220 object_block_entry_eq (const void *p1
, const void *p2
)
222 const struct object_block
*old
= (const struct object_block
*) p1
;
223 const section
*new_section
= (const section
*) p2
;
225 return old
->sect
== new_section
;
229 object_block_entry_hash (const void *p
)
231 const struct object_block
*old
= (const struct object_block
*) p
;
232 return hash_section (old
->sect
);
235 /* Return a new unnamed section with the given fields. */
238 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
243 sect
= ggc_alloc_section ();
244 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
245 sect
->unnamed
.callback
= callback
;
246 sect
->unnamed
.data
= data
;
247 sect
->unnamed
.next
= unnamed_sections
;
249 unnamed_sections
= sect
;
253 /* Return a SECTION_NOSWITCH section with the given fields. */
256 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
260 sect
= ggc_alloc_section ();
261 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
262 sect
->noswitch
.callback
= callback
;
267 /* Return the named section structure associated with NAME. Create
268 a new section with the given fields if no such structure exists. */
271 get_section (const char *name
, unsigned int flags
, tree decl
)
273 section
*sect
, **slot
;
276 htab_find_slot_with_hash (section_htab
, name
,
277 htab_hash_string (name
), INSERT
);
278 flags
|= SECTION_NAMED
;
281 sect
= ggc_alloc_section ();
282 sect
->named
.common
.flags
= flags
;
283 sect
->named
.name
= ggc_strdup (name
);
284 sect
->named
.decl
= decl
;
290 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
291 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
293 /* It is fine if one of the section flags is
294 SECTION_WRITE | SECTION_RELRO and the other has none of these
295 flags (i.e. read-only) in named sections and either the
296 section hasn't been declared yet or has been declared as writable.
297 In that case just make sure the resulting flags are
298 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
300 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
301 == (SECTION_WRITE
| SECTION_RELRO
)
302 && (sect
->common
.flags
303 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
304 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
305 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
306 || (sect
->common
.flags
& SECTION_WRITE
)))
308 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
311 /* Sanity check user variables for flag changes. */
313 decl
= sect
->named
.decl
;
315 if (sect
->named
.decl
== NULL
)
316 error ("%+D causes a section type conflict", decl
);
319 error ("%+D causes a section type conflict with %D",
320 decl
, sect
->named
.decl
);
321 if (decl
!= sect
->named
.decl
)
322 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
323 "%qD was declared here", sect
->named
.decl
);
325 /* Make sure we don't error about one section multiple times. */
326 sect
->common
.flags
|= SECTION_OVERRIDE
;
332 /* Return true if the current compilation mode benefits from having
333 objects grouped into blocks. */
336 use_object_blocks_p (void)
338 return flag_section_anchors
;
341 /* Return the object_block structure for section SECT. Create a new
342 structure if we haven't created one already. Return null if SECT
345 static struct object_block
*
346 get_block_for_section (section
*sect
)
348 struct object_block
*block
;
354 slot
= htab_find_slot_with_hash (object_block_htab
, sect
,
355 hash_section (sect
), INSERT
);
356 block
= (struct object_block
*) *slot
;
359 block
= ggc_alloc_cleared_object_block ();
366 /* Create a symbol with label LABEL and place it at byte offset
367 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
368 is not yet known. LABEL must be a garbage-collected string. */
371 create_block_symbol (const char *label
, struct object_block
*block
,
372 HOST_WIDE_INT offset
)
377 /* Create the extended SYMBOL_REF. */
378 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
379 symbol
= ggc_alloc_zone_rtx_def (size
, &rtl_zone
);
381 /* Initialize the normal SYMBOL_REF fields. */
382 memset (symbol
, 0, size
);
383 PUT_CODE (symbol
, SYMBOL_REF
);
384 PUT_MODE (symbol
, Pmode
);
385 XSTR (symbol
, 0) = label
;
386 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
388 /* Initialize the block_symbol stuff. */
389 SYMBOL_REF_BLOCK (symbol
) = block
;
390 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
395 /* Return a section with a particular name and with whatever SECTION_*
396 flags section_type_flags deems appropriate. The name of the section
397 is taken from NAME if nonnull, otherwise it is taken from DECL's
398 DECL_SECTION_NAME. DECL is the decl associated with the section
399 (see the section comment for details) and RELOC is as for
400 section_type_flags. */
403 get_named_section (tree decl
, const char *name
, int reloc
)
407 gcc_assert (!decl
|| DECL_P (decl
));
409 name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
411 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
413 return get_section (name
, flags
, decl
);
416 /* If required, set DECL_SECTION_NAME to a unique name. */
419 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
420 int flag_function_or_data_sections
)
422 if (DECL_SECTION_NAME (decl
) == NULL_TREE
423 && targetm_common
.have_named_sections
424 && (flag_function_or_data_sections
425 || DECL_ONE_ONLY (decl
)))
427 targetm
.asm_out
.unique_section (decl
, reloc
);
428 DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
) = true;
432 #ifdef BSS_SECTION_ASM_OP
434 #ifdef ASM_OUTPUT_ALIGNED_BSS
436 /* Utility function for targets to use in implementing
437 ASM_OUTPUT_ALIGNED_BSS.
438 ??? It is believed that this function will work in most cases so such
439 support is localized here. */
442 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
443 const char *name
, unsigned HOST_WIDE_INT size
,
446 switch_to_section (bss_section
);
447 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
448 #ifdef ASM_DECLARE_OBJECT_NAME
449 last_assemble_variable_decl
= decl
;
450 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
452 /* Standard thing is just output label for the object. */
453 ASM_OUTPUT_LABEL (file
, name
);
454 #endif /* ASM_DECLARE_OBJECT_NAME */
455 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
460 #endif /* BSS_SECTION_ASM_OP */
462 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
463 /* Return the hot section for function DECL. Return text_section for
467 hot_function_section (tree decl
)
469 if (decl
!= NULL_TREE
470 && DECL_SECTION_NAME (decl
) != NULL_TREE
471 && targetm_common
.have_named_sections
)
472 return get_named_section (decl
, NULL
, 0);
478 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
481 When DECL_SECTION_NAME is non-NULL and it is implicit section and
482 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
483 concatenate the name with NAMED_SECTION_SUFFIX.
484 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
487 get_named_text_section (tree decl
,
488 const char *text_section_name
,
489 const char *named_section_suffix
)
491 if (decl
&& DECL_SECTION_NAME (decl
))
493 if (named_section_suffix
)
495 tree dsn
= DECL_SECTION_NAME (decl
);
496 const char *stripped_name
;
499 name
= (char *) alloca (TREE_STRING_LENGTH (dsn
) + 1);
500 memcpy (name
, TREE_STRING_POINTER (dsn
),
501 TREE_STRING_LENGTH (dsn
) + 1);
503 stripped_name
= targetm
.strip_name_encoding (name
);
505 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
506 return get_named_section (decl
, buffer
, 0);
508 else if (DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
512 /* Do not try to split gnu_linkonce functions. This gets somewhat
514 if (DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
)
516 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
517 name
= targetm
.strip_name_encoding (name
);
518 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
524 return get_named_section (decl
, text_section_name
, 0);
527 /* Choose named function section based on its frequency. */
530 default_function_section (tree decl
, enum node_frequency freq
,
531 bool startup
, bool exit
)
533 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
534 /* Old GNU linkers have buggy --gc-section support, which sometimes
535 results in .gcc_except_table* sections being garbage collected. */
537 && DECL_SECTION_NAME (decl
)
538 && DECL_HAS_IMPLICIT_SECTION_NAME_P (decl
))
542 if (!flag_reorder_functions
543 || !targetm_common
.have_named_sections
)
545 /* Startup code should go to startup subsection unless it is
546 unlikely executed (this happens especially with function splitting
547 where we can split away unnecessary parts of static constructors. */
548 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
549 return get_named_text_section (decl
, ".text.startup", NULL
);
551 /* Similarly for exit. */
552 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
553 return get_named_text_section (decl
, ".text.exit", NULL
);
555 /* Group cold functions together, similarly for hot code. */
558 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
559 return get_named_text_section (decl
, ".text.unlikely", NULL
);
560 case NODE_FREQUENCY_HOT
:
561 return get_named_text_section (decl
, ".text.hot", NULL
);
567 /* Return the section for function DECL.
569 If DECL is NULL_TREE, return the text section. We can be passed
570 NULL_TREE under some circumstances by dbxout.c at least.
572 If FORCE_COLD is true, return cold function section ignoring
573 the frequency info of cgraph_node. */
576 function_section_1 (tree decl
, bool force_cold
)
578 section
*section
= NULL
;
579 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
580 bool startup
= false, exit
= false;
584 struct cgraph_node
*node
= cgraph_get_node (decl
);
588 freq
= node
->frequency
;
589 startup
= node
->only_called_at_startup
;
590 exit
= node
->only_called_at_exit
;
594 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
596 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
597 if (decl
!= NULL_TREE
598 && DECL_SECTION_NAME (decl
) != NULL_TREE
)
600 if (targetm
.asm_out
.function_section
)
601 section
= targetm
.asm_out
.function_section (decl
, freq
,
605 return get_named_section (decl
, NULL
, 0);
608 return targetm
.asm_out
.select_section
609 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
612 if (targetm
.asm_out
.function_section
)
613 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
616 return hot_function_section (decl
);
620 /* Return the section for function DECL.
622 If DECL is NULL_TREE, return the text section. We can be passed
623 NULL_TREE under some circumstances by dbxout.c at least. */
626 function_section (tree decl
)
628 /* Handle cases where function splitting code decides
629 to put function entry point into unlikely executed section
630 despite the fact that the function itself is not cold
631 (i.e. it is called rarely but contains a hot loop that is
632 better to live in hot subsection for the code locality). */
633 return function_section_1 (decl
,
634 first_function_block_is_cold
);
637 /* Return the section for the current function, take IN_COLD_SECTION_P
641 current_function_section (void)
643 return function_section_1 (current_function_decl
, in_cold_section_p
);
646 /* Tell assembler to switch to unlikely-to-be-executed text section. */
649 unlikely_text_section (void)
651 return function_section_1 (current_function_decl
, true);
654 /* When called within a function context, return true if the function
655 has been assigned a cold text section and if SECT is that section.
656 When called outside a function context, return true if SECT is the
657 default cold section. */
660 unlikely_text_section_p (section
*sect
)
662 return sect
== function_section_1 (current_function_decl
, true);
665 /* Return the read-only data section associated with function DECL. */
668 default_function_rodata_section (tree decl
)
670 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
672 const char *name
= TREE_STRING_POINTER (DECL_SECTION_NAME (decl
));
674 if (DECL_ONE_ONLY (decl
) && HAVE_COMDAT_GROUP
)
680 dot
= strchr (name
+ 1, '.');
683 len
= strlen (dot
) + 8;
684 rname
= (char *) alloca (len
);
686 strcpy (rname
, ".rodata");
688 return get_section (rname
, SECTION_LINKONCE
, decl
);
690 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
691 else if (DECL_ONE_ONLY (decl
)
692 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
694 size_t len
= strlen (name
) + 1;
695 char *rname
= (char *) alloca (len
);
697 memcpy (rname
, name
, len
);
699 return get_section (rname
, SECTION_LINKONCE
, decl
);
701 /* For .text.foo we want to use .rodata.foo. */
702 else if (flag_function_sections
&& flag_data_sections
703 && strncmp (name
, ".text.", 6) == 0)
705 size_t len
= strlen (name
) + 1;
706 char *rname
= (char *) alloca (len
+ 2);
708 memcpy (rname
, ".rodata", 7);
709 memcpy (rname
+ 7, name
+ 5, len
- 5);
710 return get_section (rname
, 0, decl
);
714 return readonly_data_section
;
717 /* Return the read-only data section associated with function DECL
718 for targets where that section should be always the single
719 readonly data section. */
722 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
724 return readonly_data_section
;
727 /* Return the section to use for string merging. */
730 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
731 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
732 unsigned int flags ATTRIBUTE_UNUSED
)
736 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
737 && TREE_CODE (decl
) == STRING_CST
738 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
740 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
741 && TREE_STRING_LENGTH (decl
) >= len
)
743 enum machine_mode mode
;
744 unsigned int modesize
;
748 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
749 char *name
= (char *) alloca (strlen (prefix
) + 30);
751 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
752 modesize
= GET_MODE_BITSIZE (mode
);
753 if (modesize
>= 8 && modesize
<= 256
754 && (modesize
& (modesize
- 1)) == 0)
756 if (align
< modesize
)
759 str
= TREE_STRING_POINTER (decl
);
760 unit
= GET_MODE_SIZE (mode
);
762 /* Check for embedded NUL characters. */
763 for (i
= 0; i
< len
; i
+= unit
)
765 for (j
= 0; j
< unit
; j
++)
766 if (str
[i
+ j
] != '\0')
773 sprintf (name
, "%s.str%d.%d", prefix
,
774 modesize
/ 8, (int) (align
/ 8));
775 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
776 return get_section (name
, flags
, NULL
);
781 return readonly_data_section
;
784 /* Return the section to use for constant merging. */
787 mergeable_constant_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
788 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
789 unsigned int flags ATTRIBUTE_UNUSED
)
791 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
793 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
799 && (align
& (align
- 1)) == 0)
801 const char *prefix
= targetm
.asm_out
.mergeable_rodata_prefix
;
802 char *name
= (char *) alloca (strlen (prefix
) + 30);
804 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
805 flags
|= (align
/ 8) | SECTION_MERGE
;
806 return get_section (name
, flags
, NULL
);
808 return readonly_data_section
;
811 /* Given NAME, a putative register name, discard any customary prefixes. */
814 strip_reg_name (const char *name
)
816 #ifdef REGISTER_PREFIX
817 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
818 name
+= strlen (REGISTER_PREFIX
);
820 if (name
[0] == '%' || name
[0] == '#')
825 /* The user has asked for a DECL to have a particular name. Set (or
826 change) it in such a way that we don't prefix an underscore to
829 set_user_assembler_name (tree decl
, const char *name
)
831 char *starred
= (char *) alloca (strlen (name
) + 2);
833 strcpy (starred
+ 1, name
);
834 change_decl_assembler_name (decl
, get_identifier (starred
));
835 SET_DECL_RTL (decl
, NULL_RTX
);
838 /* Decode an `asm' spec for a declaration as a register name.
839 Return the register number, or -1 if nothing specified,
840 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
841 or -3 if ASMSPEC is `cc' and is not recognized,
842 or -4 if ASMSPEC is `memory' and is not recognized.
843 Accept an exact spelling or a decimal number.
844 Prefixes such as % are optional. */
847 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
849 /* Presume just one register is clobbered. */
856 /* Get rid of confusing prefixes. */
857 asmspec
= strip_reg_name (asmspec
);
859 /* Allow a decimal number as a "register name". */
860 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
861 if (! ISDIGIT (asmspec
[i
]))
863 if (asmspec
[0] != 0 && i
< 0)
866 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0)
872 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
874 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
877 #ifdef OVERLAPPING_REGISTER_NAMES
881 const char *const name
;
884 } table
[] = OVERLAPPING_REGISTER_NAMES
;
886 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
888 && ! strcmp (asmspec
, table
[i
].name
))
890 *pnregs
= table
[i
].nregs
;
891 return table
[i
].number
;
894 #endif /* OVERLAPPING_REGISTER_NAMES */
896 #ifdef ADDITIONAL_REGISTER_NAMES
898 static const struct { const char *const name
; const int number
; } table
[]
899 = ADDITIONAL_REGISTER_NAMES
;
901 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
903 && ! strcmp (asmspec
, table
[i
].name
))
904 return table
[i
].number
;
906 #endif /* ADDITIONAL_REGISTER_NAMES */
908 if (!strcmp (asmspec
, "memory"))
911 if (!strcmp (asmspec
, "cc"))
921 decode_reg_name (const char *name
)
924 return decode_reg_name_and_count (name
, &count
);
928 /* Return true if DECL's initializer is suitable for a BSS section. */
931 bss_initializer_p (const_tree decl
)
933 return (DECL_INITIAL (decl
) == NULL
934 || DECL_INITIAL (decl
) == error_mark_node
935 || (flag_zero_initialized_in_bss
936 /* Leave constant zeroes in .rodata so they
938 && !TREE_READONLY (decl
)
939 && initializer_zerop (DECL_INITIAL (decl
))));
942 /* Compute the alignment of variable specified by DECL.
943 DONT_OUTPUT_DATA is from assemble_variable. */
946 align_variable (tree decl
, bool dont_output_data
)
948 unsigned int align
= DECL_ALIGN (decl
);
950 /* In the case for initialing an array whose length isn't specified,
951 where we have not yet been able to do the layout,
952 figure out the proper alignment now. */
953 if (dont_output_data
&& DECL_SIZE (decl
) == 0
954 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
955 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
957 /* Some object file formats have a maximum alignment which they support.
958 In particular, a.out format supports a maximum alignment of 4. */
959 if (align
> MAX_OFILE_ALIGNMENT
)
961 warning (0, "alignment of %q+D is greater than maximum object "
962 "file alignment. Using %d", decl
,
963 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
964 align
= MAX_OFILE_ALIGNMENT
;
967 /* On some machines, it is good to increase alignment sometimes. */
968 if (! DECL_USER_ALIGN (decl
))
970 #ifdef DATA_ALIGNMENT
971 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
972 /* Don't increase alignment too much for TLS variables - TLS space
974 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
977 #ifdef CONSTANT_ALIGNMENT
978 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
980 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
982 /* Don't increase alignment too much for TLS variables - TLS space
984 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
990 /* Reset the alignment in case we have made it tighter, so we can benefit
991 from it in get_pointer_alignment. */
992 DECL_ALIGN (decl
) = align
;
995 /* Return the section into which the given VAR_DECL or CONST_DECL
996 should be placed. PREFER_NOSWITCH_P is true if a noswitch
997 section should be used wherever possible. */
1000 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1002 addr_space_t as
= ADDR_SPACE_GENERIC
;
1005 if (TREE_TYPE (decl
) != error_mark_node
)
1006 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1008 if (DECL_COMMON (decl
))
1010 /* If the decl has been given an explicit section name, or it resides
1011 in a non-generic address space, then it isn't common, and shouldn't
1012 be handled as such. */
1013 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1014 && ADDR_SPACE_GENERIC_P (as
));
1015 if (DECL_THREAD_LOCAL_P (decl
))
1016 return tls_comm_section
;
1017 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1018 return comm_section
;
1021 if (DECL_INITIAL (decl
) == error_mark_node
)
1022 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1023 else if (DECL_INITIAL (decl
))
1024 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1028 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1029 if (IN_NAMED_SECTION (decl
))
1030 return get_named_section (decl
, NULL
, reloc
);
1032 if (ADDR_SPACE_GENERIC_P (as
)
1033 && !DECL_THREAD_LOCAL_P (decl
)
1034 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1035 && bss_initializer_p (decl
))
1037 if (!TREE_PUBLIC (decl
))
1038 return lcomm_section
;
1039 if (bss_noswitch_section
)
1040 return bss_noswitch_section
;
1043 return targetm
.asm_out
.select_section (decl
, reloc
, DECL_ALIGN (decl
));
1046 /* Return the block into which object_block DECL should be placed. */
1048 static struct object_block
*
1049 get_block_for_decl (tree decl
)
1053 if (TREE_CODE (decl
) == VAR_DECL
)
1055 /* The object must be defined in this translation unit. */
1056 if (DECL_EXTERNAL (decl
))
1059 /* There's no point using object blocks for something that is
1060 isolated by definition. */
1061 if (DECL_ONE_ONLY (decl
))
1065 /* We can only calculate block offsets if the decl has a known
1067 if (DECL_SIZE_UNIT (decl
) == NULL
)
1069 if (!host_integerp (DECL_SIZE_UNIT (decl
), 1))
1072 /* Find out which section should contain DECL. We cannot put it into
1073 an object block if it requires a standalone definition. */
1074 if (TREE_CODE (decl
) == VAR_DECL
)
1075 align_variable (decl
, 0);
1076 sect
= get_variable_section (decl
, true);
1077 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1080 return get_block_for_section (sect
);
1083 /* Make sure block symbol SYMBOL is in block BLOCK. */
1086 change_symbol_block (rtx symbol
, struct object_block
*block
)
1088 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1090 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1091 SYMBOL_REF_BLOCK (symbol
) = block
;
1095 /* Return true if it is possible to put DECL in an object_block. */
1098 use_blocks_for_decl_p (tree decl
)
1100 /* Only data DECLs can be placed into object blocks. */
1101 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1104 /* Detect decls created by dw2_force_const_mem. Such decls are
1105 special because DECL_INITIAL doesn't specify the decl's true value.
1106 dw2_output_indirect_constants will instead call assemble_variable
1107 with dont_output_data set to 1 and then print the contents itself. */
1108 if (DECL_INITIAL (decl
) == decl
)
1111 /* If this decl is an alias, then we don't want to emit a
1113 if (lookup_attribute ("alias", DECL_ATTRIBUTES (decl
)))
1116 return targetm
.use_blocks_for_decl_p (decl
);
1119 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1120 have static storage duration. In other words, it should not be an
1121 automatic variable, including PARM_DECLs.
1123 There is, however, one exception: this function handles variables
1124 explicitly placed in a particular register by the user.
1126 This is never called for PARM_DECL nodes. */
1129 make_decl_rtl (tree decl
)
1131 const char *name
= 0;
1135 /* Check that we are not being given an automatic variable. */
1136 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1137 && TREE_CODE (decl
) != RESULT_DECL
);
1139 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1140 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1141 || TREE_STATIC (decl
)
1142 || TREE_PUBLIC (decl
)
1143 || DECL_EXTERNAL (decl
)
1144 || DECL_REGISTER (decl
));
1146 /* And that we were not given a type or a label. */
1147 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1148 && TREE_CODE (decl
) != LABEL_DECL
);
1150 /* For a duplicate declaration, we can be called twice on the
1151 same DECL node. Don't discard the RTL already made. */
1152 if (DECL_RTL_SET_P (decl
))
1154 /* If the old RTL had the wrong mode, fix the mode. */
1155 x
= DECL_RTL (decl
);
1156 if (GET_MODE (x
) != DECL_MODE (decl
))
1157 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1159 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1162 /* ??? Another way to do this would be to maintain a hashed
1163 table of such critters. Instead of adding stuff to a DECL
1164 to give certain attributes to it, we could use an external
1165 hash map from DECL to set of attributes. */
1167 /* Let the target reassign the RTL if it wants.
1168 This is necessary, for example, when one machine specific
1169 decl attribute overrides another. */
1170 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1172 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1173 on the new decl information. */
1175 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1176 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1177 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1179 /* Make this function static known to the mudflap runtime. */
1180 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1181 mudflap_enqueue_decl (decl
);
1186 /* If this variable belongs to the global constant pool, retrieve the
1187 pre-computed RTL or recompute it in LTO mode. */
1188 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1190 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1194 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
1196 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1197 && DECL_REGISTER (decl
))
1199 error ("register name not specified for %q+D", decl
);
1201 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1203 const char *asmspec
= name
+1;
1204 enum machine_mode mode
= DECL_MODE (decl
);
1205 reg_number
= decode_reg_name (asmspec
);
1206 /* First detect errors in declaring global registers. */
1207 if (reg_number
== -1)
1208 error ("register name not specified for %q+D", decl
);
1209 else if (reg_number
< 0)
1210 error ("invalid register name for %q+D", decl
);
1211 else if (mode
== BLKmode
)
1212 error ("data type of %q+D isn%'t suitable for a register",
1214 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1215 error ("the register specified for %q+D cannot be accessed"
1216 " by the current target", decl
);
1217 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1218 error ("the register specified for %q+D is not general enough"
1219 " to be used as a register variable", decl
);
1220 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1221 error ("register specified for %q+D isn%'t suitable for data type",
1223 /* Now handle properly declared static register variables. */
1228 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1230 DECL_INITIAL (decl
) = 0;
1231 error ("global register variable has initial value");
1233 if (TREE_THIS_VOLATILE (decl
))
1234 warning (OPT_Wvolatile_register_var
,
1235 "optimization may eliminate reads and/or "
1236 "writes to register variables");
1238 /* If the user specified one of the eliminables registers here,
1239 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1240 confused with that register and be eliminated. This usage is
1241 somewhat suspect... */
1243 SET_DECL_RTL (decl
, gen_rtx_raw_REG (mode
, reg_number
));
1244 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1245 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1247 if (TREE_STATIC (decl
))
1249 /* Make this register global, so not usable for anything
1251 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1252 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1253 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1255 nregs
= hard_regno_nregs
[reg_number
][mode
];
1257 globalize_reg (decl
, reg_number
+ --nregs
);
1260 /* As a register variable, it has no section. */
1264 /* Now handle ordinary static variables and functions (in memory).
1265 Also handle vars declared register invalidly. */
1266 else if (name
[0] == '*')
1268 #ifdef REGISTER_PREFIX
1269 if (strlen (REGISTER_PREFIX
) != 0)
1271 reg_number
= decode_reg_name (name
);
1272 if (reg_number
>= 0 || reg_number
== -3)
1273 error ("register name given for non-register variable %q+D", decl
);
1278 /* Specifying a section attribute on a variable forces it into a
1279 non-.bss section, and thus it cannot be common. */
1280 /* FIXME: In general this code should not be necessary because
1281 visibility pass is doing the same work. But notice_global_symbol
1282 is called early and it needs to make DECL_RTL to get the name.
1283 we take care of recomputing the DECL_RTL after visibility is changed. */
1284 if (TREE_CODE (decl
) == VAR_DECL
1285 && DECL_SECTION_NAME (decl
) != NULL_TREE
1286 && DECL_INITIAL (decl
) == NULL_TREE
1287 && DECL_COMMON (decl
))
1288 DECL_COMMON (decl
) = 0;
1290 /* Variables can't be both common and weak. */
1291 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1292 DECL_COMMON (decl
) = 0;
1294 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1295 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1298 enum machine_mode address_mode
= Pmode
;
1299 if (TREE_TYPE (decl
) != error_mark_node
)
1301 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1302 address_mode
= targetm
.addr_space
.address_mode (as
);
1304 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1306 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1307 SET_SYMBOL_REF_DECL (x
, decl
);
1309 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1310 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1311 set_mem_attributes (x
, decl
, 1);
1312 SET_DECL_RTL (decl
, x
);
1314 /* Optionally set flags or add text to the name to record information
1315 such as that it is a function name.
1316 If the name is changed, the macro ASM_OUTPUT_LABELREF
1317 will have to know how to strip this information. */
1318 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1320 /* Make this function static known to the mudflap runtime. */
1321 if (flag_mudflap
&& TREE_CODE (decl
) == VAR_DECL
)
1322 mudflap_enqueue_decl (decl
);
1325 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1326 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1330 make_decl_rtl_for_debug (tree decl
)
1332 unsigned int save_aliasing_flag
, save_mudflap_flag
;
1335 if (DECL_RTL_SET_P (decl
))
1336 return DECL_RTL (decl
);
1338 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1339 call new_alias_set. If running with -fcompare-debug, sometimes
1340 we do not want to create alias sets that will throw the alias
1341 numbers off in the comparison dumps. So... clearing
1342 flag_strict_aliasing will keep new_alias_set() from creating a
1343 new set. It is undesirable to register decl with mudflap
1344 in this case as well. */
1345 save_aliasing_flag
= flag_strict_aliasing
;
1346 flag_strict_aliasing
= 0;
1347 save_mudflap_flag
= flag_mudflap
;
1350 rtl
= DECL_RTL (decl
);
1351 /* Reset DECL_RTL back, as various parts of the compiler expects
1352 DECL_RTL set meaning it is actually going to be output. */
1353 SET_DECL_RTL (decl
, NULL
);
1355 flag_strict_aliasing
= save_aliasing_flag
;
1356 flag_mudflap
= save_mudflap_flag
;
1361 /* Output a string of literal assembler code
1362 for an `asm' keyword used between functions. */
1365 assemble_asm (tree string
)
1370 if (TREE_CODE (string
) == ADDR_EXPR
)
1371 string
= TREE_OPERAND (string
, 0);
1373 p
= TREE_STRING_POINTER (string
);
1374 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1377 /* Write the address of the entity given by SYMBOL to SEC. */
1379 assemble_addr_to_section (rtx symbol
, section
*sec
)
1381 switch_to_section (sec
);
1382 assemble_align (POINTER_SIZE
);
1383 assemble_integer (symbol
, POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
1386 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1387 not) section for PRIORITY. */
1389 get_cdtor_priority_section (int priority
, bool constructor_p
)
1393 /* ??? This only works reliably with the GNU linker. */
1394 sprintf (buf
, "%s.%.5u",
1395 constructor_p
? ".ctors" : ".dtors",
1396 /* Invert the numbering so the linker puts us in the proper
1397 order; constructors are run from right to left, and the
1398 linker sorts in increasing order. */
1399 MAX_INIT_PRIORITY
- priority
);
1400 return get_section (buf
, SECTION_WRITE
, NULL
);
1404 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1408 if (priority
!= DEFAULT_INIT_PRIORITY
)
1409 sec
= get_cdtor_priority_section (priority
,
1410 /*constructor_p=*/false);
1412 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1414 assemble_addr_to_section (symbol
, sec
);
1417 #ifdef DTORS_SECTION_ASM_OP
1419 default_dtor_section_asm_out_destructor (rtx symbol
,
1420 int priority ATTRIBUTE_UNUSED
)
1422 assemble_addr_to_section (symbol
, dtors_section
);
1427 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1431 if (priority
!= DEFAULT_INIT_PRIORITY
)
1432 sec
= get_cdtor_priority_section (priority
,
1433 /*constructor_p=*/true);
1435 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1437 assemble_addr_to_section (symbol
, sec
);
1440 #ifdef CTORS_SECTION_ASM_OP
1442 default_ctor_section_asm_out_constructor (rtx symbol
,
1443 int priority ATTRIBUTE_UNUSED
)
1445 assemble_addr_to_section (symbol
, ctors_section
);
1449 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1450 a nonzero value if the constant pool should be output before the
1451 start of the function, or a zero value if the pool should output
1452 after the end of the function. The default is to put it before the
1455 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1456 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1459 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1460 to be output to assembler.
1461 Set first_global_object_name and weak_global_object_name as appropriate. */
1464 notice_global_symbol (tree decl
)
1466 const char **type
= &first_global_object_name
;
1468 if (first_global_object_name
1469 || !TREE_PUBLIC (decl
)
1470 || DECL_EXTERNAL (decl
)
1471 || !DECL_NAME (decl
)
1472 || (TREE_CODE (decl
) != FUNCTION_DECL
1473 && (TREE_CODE (decl
) != VAR_DECL
1474 || (DECL_COMMON (decl
)
1475 && (DECL_INITIAL (decl
) == 0
1476 || DECL_INITIAL (decl
) == error_mark_node
))))
1477 || !MEM_P (DECL_RTL (decl
)))
1480 /* We win when global object is found, but it is useful to know about weak
1481 symbol as well so we can produce nicer unique names. */
1482 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1483 type
= &weak_global_object_name
;
1489 rtx decl_rtl
= DECL_RTL (decl
);
1491 p
= targetm
.strip_name_encoding (XSTR (XEXP (decl_rtl
, 0), 0));
1492 name
= ggc_strdup (p
);
1498 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1499 current function goes into the cold section, so that targets can use
1500 current_function_section during RTL expansion. DECL describes the
1504 decide_function_section (tree decl
)
1506 first_function_block_is_cold
= false;
1508 if (flag_reorder_blocks_and_partition
)
1509 /* We will decide in assemble_start_function. */
1512 if (DECL_SECTION_NAME (decl
))
1514 struct cgraph_node
*node
= cgraph_get_node (current_function_decl
);
1515 /* Calls to function_section rely on first_function_block_is_cold
1517 first_function_block_is_cold
= (node
1519 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1522 in_cold_section_p
= first_function_block_is_cold
;
1525 /* Output assembler code for the constant pool of a function and associated
1526 with defining the name of the function. DECL describes the function.
1527 NAME is the function's name. For the constant pool, we use the current
1528 constant pool data. */
1531 assemble_start_function (tree decl
, const char *fnname
)
1534 char tmp_label
[100];
1535 bool hot_label_written
= false;
1537 if (flag_reorder_blocks_and_partition
)
1539 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1540 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1541 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1542 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1543 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1544 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1545 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1546 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1551 crtl
->subsections
.hot_section_label
= NULL
;
1552 crtl
->subsections
.cold_section_label
= NULL
;
1553 crtl
->subsections
.hot_section_end_label
= NULL
;
1554 crtl
->subsections
.cold_section_end_label
= NULL
;
1557 /* The following code does not need preprocessing in the assembler. */
1561 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1562 output_constant_pool (fnname
, decl
);
1564 /* Make sure the not and cold text (code) sections are properly
1565 aligned. This is necessary here in the case where the function
1566 has both hot and cold sections, because we don't want to re-set
1567 the alignment when the section switch happens mid-function. */
1569 if (flag_reorder_blocks_and_partition
)
1571 first_function_block_is_cold
= false;
1573 switch_to_section (unlikely_text_section ());
1574 assemble_align (DECL_ALIGN (decl
));
1575 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1577 /* When the function starts with a cold section, we need to explicitly
1578 align the hot section and write out the hot section label.
1579 But if the current function is a thunk, we do not have a CFG. */
1581 && BB_PARTITION (ENTRY_BLOCK_PTR
->next_bb
) == BB_COLD_PARTITION
)
1583 switch_to_section (text_section
);
1584 assemble_align (DECL_ALIGN (decl
));
1585 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1586 hot_label_written
= true;
1587 first_function_block_is_cold
= true;
1589 in_cold_section_p
= first_function_block_is_cold
;
1593 /* Switch to the correct text section for the start of the function. */
1595 switch_to_section (function_section (decl
));
1596 if (flag_reorder_blocks_and_partition
1597 && !hot_label_written
)
1598 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1600 /* Tell assembler to move to target machine's alignment for functions. */
1601 align
= floor_log2 (DECL_ALIGN (decl
) / BITS_PER_UNIT
);
1604 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1607 /* Handle a user-specified function alignment.
1608 Note that we still need to align to DECL_ALIGN, as above,
1609 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1610 if (! DECL_USER_ALIGN (decl
)
1611 && align_functions_log
> align
1612 && optimize_function_for_speed_p (cfun
))
1614 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1615 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1616 align_functions_log
, align_functions
- 1);
1618 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1622 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1623 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1626 if (!DECL_IGNORED_P (decl
))
1627 (*debug_hooks
->begin_function
) (decl
);
1629 /* Make function name accessible from other files, if appropriate. */
1631 if (TREE_PUBLIC (decl
))
1633 notice_global_symbol (decl
);
1635 globalize_decl (decl
);
1637 maybe_assemble_visibility (decl
);
1640 if (DECL_PRESERVE_P (decl
))
1641 targetm
.asm_out
.mark_decl_preserved (fnname
);
1643 /* Do any machine/system dependent processing of the function name. */
1644 #ifdef ASM_DECLARE_FUNCTION_NAME
1645 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1647 /* Standard thing is just output label for the function. */
1648 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1649 #endif /* ASM_DECLARE_FUNCTION_NAME */
1651 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1652 saw_no_split_stack
= true;
1655 /* Output assembler code associated with defining the size of the
1656 function. DECL describes the function. NAME is the function's name. */
1659 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1661 #ifdef ASM_DECLARE_FUNCTION_SIZE
1662 /* We could have switched section in the middle of the function. */
1663 if (flag_reorder_blocks_and_partition
)
1664 switch_to_section (function_section (decl
));
1665 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1667 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1669 output_constant_pool (fnname
, decl
);
1670 switch_to_section (function_section (decl
)); /* need to switch back */
1672 /* Output labels for end of hot/cold text sections (to be used by
1674 if (flag_reorder_blocks_and_partition
)
1676 section
*save_text_section
;
1678 save_text_section
= in_section
;
1679 switch_to_section (unlikely_text_section ());
1680 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1681 if (first_function_block_is_cold
)
1682 switch_to_section (text_section
);
1684 switch_to_section (function_section (decl
));
1685 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1686 switch_to_section (save_text_section
);
1690 /* Assemble code to leave SIZE bytes of zeros. */
1693 assemble_zeros (unsigned HOST_WIDE_INT size
)
1695 /* Do no output if -fsyntax-only. */
1696 if (flag_syntax_only
)
1699 #ifdef ASM_NO_SKIP_IN_TEXT
1700 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1701 so we must output 0s explicitly in the text section. */
1702 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1704 unsigned HOST_WIDE_INT i
;
1705 for (i
= 0; i
< size
; i
++)
1706 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1711 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1714 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1717 assemble_align (int align
)
1719 if (align
> BITS_PER_UNIT
)
1721 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1725 /* Assemble a string constant with the specified C string as contents. */
1728 assemble_string (const char *p
, int size
)
1733 /* If the string is very long, split it up. */
1737 int thissize
= size
- pos
;
1738 if (thissize
> maximum
)
1741 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1749 /* A noswitch_section_callback for lcomm_section. */
1752 emit_local (tree decl ATTRIBUTE_UNUSED
,
1753 const char *name ATTRIBUTE_UNUSED
,
1754 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1755 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1757 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1758 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1759 size
, DECL_ALIGN (decl
));
1761 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1762 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1765 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1770 /* A noswitch_section_callback for bss_noswitch_section. */
1772 #if defined ASM_OUTPUT_ALIGNED_BSS
1774 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1775 const char *name ATTRIBUTE_UNUSED
,
1776 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1777 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1779 #if defined ASM_OUTPUT_ALIGNED_BSS
1780 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
, DECL_ALIGN (decl
));
1786 /* A noswitch_section_callback for comm_section. */
1789 emit_common (tree decl ATTRIBUTE_UNUSED
,
1790 const char *name ATTRIBUTE_UNUSED
,
1791 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1792 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1794 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1795 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1796 size
, DECL_ALIGN (decl
));
1798 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1799 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
, DECL_ALIGN (decl
));
1802 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
1807 /* A noswitch_section_callback for tls_comm_section. */
1810 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
1811 const char *name ATTRIBUTE_UNUSED
,
1812 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1813 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1815 #ifdef ASM_OUTPUT_TLS_COMMON
1816 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
1819 sorry ("thread-local COMMON data not implemented");
1824 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
1825 NAME is the name of DECL's SYMBOL_REF. */
1828 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
)
1830 unsigned HOST_WIDE_INT size
, rounded
;
1832 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
1835 if (flag_asan
&& asan_protect_global (decl
))
1836 size
+= asan_red_zone_size (size
);
1838 /* Don't allocate zero bytes of common,
1839 since that means "undefined external" in the linker. */
1843 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
1844 so that each uninitialized object starts on such a boundary. */
1845 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
1846 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
1847 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
1849 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
1850 && (unsigned HOST_WIDE_INT
) DECL_ALIGN_UNIT (decl
) > rounded
)
1851 warning (0, "requested alignment for %q+D is greater than "
1852 "implemented alignment of %wu", decl
, rounded
);
1855 /* A subroutine of assemble_variable. Output the label and contents of
1856 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
1857 is as for assemble_variable. */
1860 assemble_variable_contents (tree decl
, const char *name
,
1861 bool dont_output_data
)
1863 /* Do any machine/system dependent processing of the object. */
1864 #ifdef ASM_DECLARE_OBJECT_NAME
1865 last_assemble_variable_decl
= decl
;
1866 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
1868 /* Standard thing is just output label for the object. */
1869 ASM_OUTPUT_LABEL (asm_out_file
, name
);
1870 #endif /* ASM_DECLARE_OBJECT_NAME */
1872 if (!dont_output_data
)
1874 if (DECL_INITIAL (decl
)
1875 && DECL_INITIAL (decl
) != error_mark_node
1876 && !initializer_zerop (DECL_INITIAL (decl
)))
1877 /* Output the actual data. */
1878 output_constant (DECL_INITIAL (decl
),
1879 tree_low_cst (DECL_SIZE_UNIT (decl
), 1),
1882 /* Leave space for it. */
1883 assemble_zeros (tree_low_cst (DECL_SIZE_UNIT (decl
), 1));
1887 /* Assemble everything that is needed for a variable or function declaration.
1888 Not used for automatic variables, and not used for function definitions.
1889 Should not be called for variables of incomplete structure type.
1891 TOP_LEVEL is nonzero if this variable has file scope.
1892 AT_END is nonzero if this is the special handling, at end of compilation,
1893 to define things that have had only tentative definitions.
1894 DONT_OUTPUT_DATA if nonzero means don't actually output the
1895 initial value (that will be done by the caller). */
1898 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
1899 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
1902 rtx decl_rtl
, symbol
;
1904 bool asan_protected
= false;
1906 /* This function is supposed to handle VARIABLES. Ensure we have one. */
1907 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
1909 /* Emulated TLS had better not get this far. */
1910 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
1912 last_assemble_variable_decl
= 0;
1914 /* Normally no need to say anything here for external references,
1915 since assemble_external is called by the language-specific code
1916 when a declaration is first seen. */
1918 if (DECL_EXTERNAL (decl
))
1921 /* Do nothing for global register variables. */
1922 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
1924 TREE_ASM_WRITTEN (decl
) = 1;
1928 /* If type was incomplete when the variable was declared,
1929 see if it is complete now. */
1931 if (DECL_SIZE (decl
) == 0)
1932 layout_decl (decl
, 0);
1934 /* Still incomplete => don't allocate it; treat the tentative defn
1935 (which is what it must have been) as an `extern' reference. */
1937 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
1939 error ("storage size of %q+D isn%'t known", decl
);
1940 TREE_ASM_WRITTEN (decl
) = 1;
1944 /* The first declaration of a variable that comes through this function
1945 decides whether it is global (in C, has external linkage)
1946 or local (in C, has internal linkage). So do nothing more
1947 if this function has already run. */
1949 if (TREE_ASM_WRITTEN (decl
))
1952 /* Make sure targetm.encode_section_info is invoked before we set
1954 decl_rtl
= DECL_RTL (decl
);
1956 TREE_ASM_WRITTEN (decl
) = 1;
1958 /* Do no output if -fsyntax-only. */
1959 if (flag_syntax_only
)
1962 if (! dont_output_data
1963 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
1965 error ("size of variable %q+D is too large", decl
);
1969 gcc_assert (MEM_P (decl_rtl
));
1970 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
1971 symbol
= XEXP (decl_rtl
, 0);
1973 /* If this symbol belongs to the tree constant pool, output the constant
1974 if it hasn't already been written. */
1975 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
1977 tree decl
= SYMBOL_REF_DECL (symbol
);
1978 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
1979 output_constant_def_contents (symbol
);
1985 name
= XSTR (symbol
, 0);
1986 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
1987 notice_global_symbol (decl
);
1989 /* Compute the alignment of this data. */
1991 align_variable (decl
, dont_output_data
);
1994 && asan_protect_global (decl
))
1996 asan_protected
= true;
1997 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
1998 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2001 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2003 if (TREE_PUBLIC (decl
))
2004 maybe_assemble_visibility (decl
);
2006 if (DECL_PRESERVE_P (decl
))
2007 targetm
.asm_out
.mark_decl_preserved (name
);
2009 /* First make the assembler name(s) global if appropriate. */
2010 sect
= get_variable_section (decl
, false);
2011 if (TREE_PUBLIC (decl
)
2012 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2013 globalize_decl (decl
);
2015 /* Output any data that we will need to use the address of. */
2016 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2017 output_addressed_constants (DECL_INITIAL (decl
));
2019 /* dbxout.c needs to know this. */
2020 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2021 DECL_IN_TEXT_SECTION (decl
) = 1;
2023 /* If the decl is part of an object_block, make sure that the decl
2024 has been positioned within its block, but do not write out its
2025 definition yet. output_object_blocks will do that later. */
2026 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2028 gcc_assert (!dont_output_data
);
2029 place_block_symbol (symbol
);
2031 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2032 assemble_noswitch_variable (decl
, name
, sect
);
2035 switch_to_section (sect
);
2036 if (DECL_ALIGN (decl
) > BITS_PER_UNIT
)
2037 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (DECL_ALIGN_UNIT (decl
)));
2038 assemble_variable_contents (decl
, name
, dont_output_data
);
2041 unsigned HOST_WIDE_INT
int size
2042 = tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
2043 assemble_zeros (asan_red_zone_size (size
));
2048 /* Return 1 if type TYPE contains any pointers. */
2051 contains_pointers_p (tree type
)
2053 switch (TREE_CODE (type
))
2056 case REFERENCE_TYPE
:
2057 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2058 so I'll play safe and return 1. */
2064 case QUAL_UNION_TYPE
:
2067 /* For a type that has fields, see if the fields have pointers. */
2068 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2069 if (TREE_CODE (fields
) == FIELD_DECL
2070 && contains_pointers_p (TREE_TYPE (fields
)))
2076 /* An array type contains pointers if its element type does. */
2077 return contains_pointers_p (TREE_TYPE (type
));
2084 /* We delay assemble_external processing until
2085 the compilation unit is finalized. This is the best we can do for
2086 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2087 it all the way to final. See PR 17982 for further discussion. */
2088 static GTY(()) tree pending_assemble_externals
;
2090 #ifdef ASM_OUTPUT_EXTERNAL
2091 /* True if DECL is a function decl for which no out-of-line copy exists.
2092 It is assumed that DECL's assembler name has been set. */
2095 incorporeal_function_p (tree decl
)
2097 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2101 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2102 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2103 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2106 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2107 /* Atomic or sync builtins which have survived this far will be
2108 resolved externally and therefore are not incorporeal. */
2109 if (strncmp (name
, "__builtin_", 10) == 0)
2115 /* Actually do the tests to determine if this is necessary, and invoke
2116 ASM_OUTPUT_EXTERNAL. */
2118 assemble_external_real (tree decl
)
2120 rtx rtl
= DECL_RTL (decl
);
2122 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2123 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2124 && !incorporeal_function_p (decl
))
2126 /* Some systems do require some output. */
2127 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2128 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2134 process_pending_assemble_externals (void)
2136 #ifdef ASM_OUTPUT_EXTERNAL
2138 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2139 assemble_external_real (TREE_VALUE (list
));
2141 pending_assemble_externals
= 0;
2145 /* This TREE_LIST contains any weak symbol declarations waiting
2147 static GTY(()) tree weak_decls
;
2149 /* Output something to declare an external symbol to the assembler,
2150 and qualifiers such as weakness. (Most assemblers don't need
2151 extern declaration, so we normally output nothing.) Do nothing if
2152 DECL is not external. */
2155 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2157 /* Make sure that the ASM_OUT_FILE is open.
2158 If it's not, we should not be calling this function. */
2159 gcc_assert (asm_out_file
);
2161 /* In a perfect world, the following condition would be true.
2162 Sadly, the Java and Go front ends emit assembly *from the front end*,
2163 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2165 /* This function should only be called if we are expanding, or have
2167 Ideally, only final.c would be calling this function, but it is
2168 not clear whether that would break things somehow. See PR 17982
2169 for further discussion. */
2170 gcc_assert (cgraph_state
== CGRAPH_STATE_EXPANSION
2171 || cgraph_state
== CGRAPH_STATE_FINISHED
);
2174 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2177 /* We want to output annotation for weak and external symbols at
2178 very last to check if they are references or not. */
2180 if (TARGET_SUPPORTS_WEAK
2182 /* TREE_STATIC is a weird and abused creature which is not
2183 generally the right test for whether an entity has been
2184 locally emitted, inlined or otherwise not-really-extern, but
2185 for declarations that can be weak, it happens to be
2187 && !TREE_STATIC (decl
)
2188 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2189 && value_member (decl
, weak_decls
) == NULL_TREE
)
2190 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2192 #ifdef ASM_OUTPUT_EXTERNAL
2193 if (value_member (decl
, pending_assemble_externals
) == NULL_TREE
)
2194 pending_assemble_externals
= tree_cons (NULL
, decl
,
2195 pending_assemble_externals
);
2199 /* Similar, for calling a library function FUN. */
2202 assemble_external_libcall (rtx fun
)
2204 /* Declare library function name external when first used, if nec. */
2205 if (! SYMBOL_REF_USED (fun
))
2207 SYMBOL_REF_USED (fun
) = 1;
2208 targetm
.asm_out
.external_libcall (fun
);
2212 /* Assemble a label named NAME. */
2215 assemble_label (FILE *file
, const char *name
)
2217 ASM_OUTPUT_LABEL (file
, name
);
2220 /* Set the symbol_referenced flag for ID. */
2222 mark_referenced (tree id
)
2224 TREE_SYMBOL_REFERENCED (id
) = 1;
2227 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2229 mark_decl_referenced (tree decl
)
2231 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2233 /* Extern inline functions don't become needed when referenced.
2234 If we know a method will be emitted in other TU and no new
2235 functions can be marked reachable, just use the external
2237 struct cgraph_node
*node
= cgraph_get_create_node (decl
);
2238 if (!DECL_EXTERNAL (decl
)
2239 && !node
->local
.finalized
)
2240 cgraph_mark_force_output_node (node
);
2242 else if (TREE_CODE (decl
) == VAR_DECL
)
2244 struct varpool_node
*node
= varpool_node_for_decl (decl
);
2245 /* C++ frontend use mark_decl_references to force COMDAT variables
2246 to be output that might appear dead otherwise. */
2247 node
->symbol
.force_output
= true;
2249 /* else do nothing - we can get various sorts of CST nodes here,
2250 which do not need to be marked. */
2254 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
2255 until we find an identifier that is not itself a transparent alias.
2256 Modify the alias passed to it by reference (and all aliases on the
2257 way to the ultimate target), such that they do not have to be
2258 followed again, and return the ultimate target of the alias
2262 ultimate_transparent_alias_target (tree
*alias
)
2264 tree target
= *alias
;
2266 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
2268 gcc_assert (TREE_CHAIN (target
));
2269 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
2270 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
2271 && ! TREE_CHAIN (target
));
2278 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2279 starts with a *, the rest of NAME is output verbatim. Otherwise
2280 NAME is transformed in a target-specific way (usually by the
2281 addition of an underscore). */
2284 assemble_name_raw (FILE *file
, const char *name
)
2287 fputs (&name
[1], file
);
2289 ASM_OUTPUT_LABELREF (file
, name
);
2292 /* Like assemble_name_raw, but should be used when NAME might refer to
2293 an entity that is also represented as a tree (like a function or
2294 variable). If NAME does refer to such an entity, that entity will
2295 be marked as referenced. */
2298 assemble_name (FILE *file
, const char *name
)
2300 const char *real_name
;
2303 real_name
= targetm
.strip_name_encoding (name
);
2305 id
= maybe_get_identifier (real_name
);
2310 mark_referenced (id
);
2311 ultimate_transparent_alias_target (&id
);
2313 name
= IDENTIFIER_POINTER (id
);
2314 gcc_assert (! TREE_CHAIN (id
));
2317 assemble_name_raw (file
, name
);
2320 /* Allocate SIZE bytes writable static space with a gensym name
2321 and return an RTX to refer to its address. */
2324 assemble_static_space (unsigned HOST_WIDE_INT size
)
2327 const char *namestring
;
2330 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2332 namestring
= ggc_strdup (name
);
2334 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2335 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2337 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2338 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2341 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2342 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2345 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2346 so that each uninitialized object starts on such a boundary. */
2347 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2348 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2349 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2350 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2351 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2352 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2359 /* Assemble the static constant template for function entry trampolines.
2360 This is done at most once per compilation.
2361 Returns an RTX for the address of the template. */
2363 static GTY(()) rtx initial_trampoline
;
2366 assemble_trampoline_template (void)
2373 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2375 if (initial_trampoline
)
2376 return initial_trampoline
;
2378 /* By default, put trampoline templates in read-only data section. */
2380 #ifdef TRAMPOLINE_SECTION
2381 switch_to_section (TRAMPOLINE_SECTION
);
2383 switch_to_section (readonly_data_section
);
2386 /* Write the assembler code to define one. */
2387 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2389 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2391 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2392 targetm
.asm_out
.trampoline_template (asm_out_file
);
2394 /* Record the rtl to refer to it. */
2395 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2396 name
= ggc_strdup (label
);
2397 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2398 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2400 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2401 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2402 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2404 return initial_trampoline
;
2407 /* A and B are either alignments or offsets. Return the minimum alignment
2408 that may be assumed after adding the two together. */
2410 static inline unsigned
2411 min_align (unsigned int a
, unsigned int b
)
2413 return (a
| b
) & -(a
| b
);
2416 /* Return the assembler directive for creating a given kind of integer
2417 object. SIZE is the number of bytes in the object and ALIGNED_P
2418 indicates whether it is known to be aligned. Return NULL if the
2419 assembly dialect has no such directive.
2421 The returned string should be printed at the start of a new line and
2422 be followed immediately by the object's initial value. */
2425 integer_asm_op (int size
, int aligned_p
)
2427 struct asm_int_op
*ops
;
2430 ops
= &targetm
.asm_out
.aligned_op
;
2432 ops
= &targetm
.asm_out
.unaligned_op
;
2437 return targetm
.asm_out
.byte_op
;
2451 /* Use directive OP to assemble an integer object X. Print OP at the
2452 start of the line, followed immediately by the value of X. */
2455 assemble_integer_with_op (const char *op
, rtx x
)
2457 fputs (op
, asm_out_file
);
2458 output_addr_const (asm_out_file
, x
);
2459 fputc ('\n', asm_out_file
);
2462 /* The default implementation of the asm_out.integer target hook. */
2465 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2466 unsigned int size ATTRIBUTE_UNUSED
,
2467 int aligned_p ATTRIBUTE_UNUSED
)
2469 const char *op
= integer_asm_op (size
, aligned_p
);
2470 /* Avoid GAS bugs for large values. Specifically negative values whose
2471 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2472 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE
/ BITS_PER_UNIT
)
2474 return op
&& (assemble_integer_with_op (op
, x
), true);
2477 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2478 the alignment of the integer in bits. Return 1 if we were able to output
2479 the constant, otherwise 0. We must be able to output the constant,
2480 if FORCE is nonzero. */
2483 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2487 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2489 /* See if the target hook can handle this kind of object. */
2490 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2493 /* If the object is a multi-byte one, try splitting it up. Split
2494 it into words it if is multi-word, otherwise split it into bytes. */
2497 enum machine_mode omode
, imode
;
2498 unsigned int subalign
;
2499 unsigned int subsize
, i
;
2500 enum mode_class mclass
;
2502 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2503 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2504 if (GET_CODE (x
) == CONST_FIXED
)
2505 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2509 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2510 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2512 for (i
= 0; i
< size
; i
+= subsize
)
2514 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2515 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2521 /* If we've printed some of it, but not all of it, there's no going
2526 gcc_assert (!force
);
2532 assemble_real (REAL_VALUE_TYPE d
, enum machine_mode mode
, unsigned int align
)
2534 long data
[4] = {0, 0, 0, 0};
2536 int bitsize
, nelts
, nunits
, units_per
;
2538 /* This is hairy. We have a quantity of known size. real_to_target
2539 will put it into an array of *host* longs, 32 bits per element
2540 (even if long is more than 32 bits). We need to determine the
2541 number of array elements that are occupied (nelts) and the number
2542 of *target* min-addressable units that will be occupied in the
2543 object file (nunits). We cannot assume that 32 divides the
2544 mode's bitsize (size * BITS_PER_UNIT) evenly.
2546 size * BITS_PER_UNIT is used here to make sure that padding bits
2547 (which might appear at either end of the value; real_to_target
2548 will include the padding bits in its output array) are included. */
2550 nunits
= GET_MODE_SIZE (mode
);
2551 bitsize
= nunits
* BITS_PER_UNIT
;
2552 nelts
= CEIL (bitsize
, 32);
2553 units_per
= 32 / BITS_PER_UNIT
;
2555 real_to_target (data
, &d
, mode
);
2557 /* Put out the first word with the specified alignment. */
2558 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2559 nunits
-= units_per
;
2561 /* Subsequent words need only 32-bit alignment. */
2562 align
= min_align (align
, 32);
2564 for (i
= 1; i
< nelts
; i
++)
2566 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2567 nunits
-= units_per
;
2571 /* Given an expression EXP with a constant value,
2572 reduce it to the sum of an assembler symbol and an integer.
2573 Store them both in the structure *VALUE.
2574 EXP must be reducible. */
2578 HOST_WIDE_INT offset
;
2582 decode_addr_const (tree exp
, struct addr_const
*value
)
2584 tree target
= TREE_OPERAND (exp
, 0);
2590 if (TREE_CODE (target
) == COMPONENT_REF
2591 && host_integerp (byte_position (TREE_OPERAND (target
, 1)), 0))
2593 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2594 target
= TREE_OPERAND (target
, 0);
2596 else if (TREE_CODE (target
) == ARRAY_REF
2597 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2599 offset
+= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (target
)), 1)
2600 * tree_low_cst (TREE_OPERAND (target
, 1), 0));
2601 target
= TREE_OPERAND (target
, 0);
2603 else if (TREE_CODE (target
) == MEM_REF
2604 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2606 offset
+= mem_ref_offset (target
).low
;
2607 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2609 else if (TREE_CODE (target
) == INDIRECT_REF
2610 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2611 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2613 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2618 switch (TREE_CODE (target
))
2622 x
= DECL_RTL (target
);
2626 x
= gen_rtx_MEM (FUNCTION_MODE
,
2627 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2636 x
= output_constant_def (target
, 1);
2643 gcc_assert (MEM_P (x
));
2647 value
->offset
= offset
;
2651 static GTY((param_is (struct constant_descriptor_tree
)))
2652 htab_t const_desc_htab
;
2654 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2656 /* Constant pool accessor function. */
2659 constant_pool_htab (void)
2661 return const_desc_htab
;
2664 /* Compute a hash code for a constant expression. */
2667 const_desc_hash (const void *ptr
)
2669 return ((const struct constant_descriptor_tree
*)ptr
)->hash
;
2673 const_hash_1 (const tree exp
)
2678 enum tree_code code
= TREE_CODE (exp
);
2680 /* Either set P and LEN to the address and len of something to hash and
2681 exit the switch or return a value. */
2686 p
= (char *) &TREE_INT_CST (exp
);
2687 len
= sizeof TREE_INT_CST (exp
);
2691 return real_hash (TREE_REAL_CST_PTR (exp
));
2694 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2697 p
= TREE_STRING_POINTER (exp
);
2698 len
= TREE_STRING_LENGTH (exp
);
2702 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2703 + const_hash_1 (TREE_IMAGPART (exp
)));
2709 hi
= 7 + VECTOR_CST_NELTS (exp
);
2711 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2712 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2719 unsigned HOST_WIDE_INT idx
;
2722 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2724 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2726 hi
= hi
* 603 + const_hash_1 (value
);
2734 struct addr_const value
;
2736 decode_addr_const (exp
, &value
);
2737 switch (GET_CODE (value
.base
))
2740 /* Don't hash the address of the SYMBOL_REF;
2741 only use the offset and the symbol name. */
2743 p
= XSTR (value
.base
, 0);
2744 for (i
= 0; p
[i
] != 0; i
++)
2745 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2749 hi
= value
.offset
+ CODE_LABEL_NUMBER (XEXP (value
.base
, 0)) * 13;
2759 case POINTER_PLUS_EXPR
:
2761 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
2762 + const_hash_1 (TREE_OPERAND (exp
, 1)));
2765 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
2768 /* A language specific constant. Just hash the code. */
2772 /* Compute hashing function. */
2774 for (i
= 0; i
< len
; i
++)
2775 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
2780 /* Wrapper of compare_constant, for the htab interface. */
2782 const_desc_eq (const void *p1
, const void *p2
)
2784 const struct constant_descriptor_tree
*const c1
2785 = (const struct constant_descriptor_tree
*) p1
;
2786 const struct constant_descriptor_tree
*const c2
2787 = (const struct constant_descriptor_tree
*) p2
;
2788 if (c1
->hash
!= c2
->hash
)
2790 return compare_constant (c1
->value
, c2
->value
);
2793 /* Compare t1 and t2, and return 1 only if they are known to result in
2794 the same bit pattern on output. */
2797 compare_constant (const tree t1
, const tree t2
)
2799 enum tree_code typecode
;
2801 if (t1
== NULL_TREE
)
2802 return t2
== NULL_TREE
;
2803 if (t2
== NULL_TREE
)
2806 if (TREE_CODE (t1
) != TREE_CODE (t2
))
2809 switch (TREE_CODE (t1
))
2812 /* Integer constants are the same only if the same width of type. */
2813 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2815 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2817 return tree_int_cst_equal (t1
, t2
);
2820 /* Real constants are the same only if the same width of type. */
2821 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2824 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
2827 /* Fixed constants are the same only if the same width of type. */
2828 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
2831 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
2834 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
2837 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
2838 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
2839 TREE_STRING_LENGTH (t1
)));
2842 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
2843 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
2849 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
2852 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
2853 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
2854 VECTOR_CST_ELT (t2
, i
)))
2862 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
2863 unsigned HOST_WIDE_INT idx
;
2865 typecode
= TREE_CODE (TREE_TYPE (t1
));
2866 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
2869 if (typecode
== ARRAY_TYPE
)
2871 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
2872 /* For arrays, check that the sizes all match. */
2873 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
2875 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
2880 /* For record and union constructors, require exact type
2882 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
2886 v1
= CONSTRUCTOR_ELTS (t1
);
2887 v2
= CONSTRUCTOR_ELTS (t2
);
2888 if (vec_safe_length (v1
) != vec_safe_length (v2
))
2891 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
2893 constructor_elt
*c1
= &(*v1
)[idx
];
2894 constructor_elt
*c2
= &(*v2
)[idx
];
2896 /* Check that each value is the same... */
2897 if (!compare_constant (c1
->value
, c2
->value
))
2899 /* ... and that they apply to the same fields! */
2900 if (typecode
== ARRAY_TYPE
)
2902 if (!compare_constant (c1
->index
, c2
->index
))
2907 if (c1
->index
!= c2
->index
)
2918 struct addr_const value1
, value2
;
2922 decode_addr_const (t1
, &value1
);
2923 decode_addr_const (t2
, &value2
);
2925 if (value1
.offset
!= value2
.offset
)
2928 code
= GET_CODE (value1
.base
);
2929 if (code
!= GET_CODE (value2
.base
))
2935 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
2939 ret
= (CODE_LABEL_NUMBER (XEXP (value1
.base
, 0))
2940 == CODE_LABEL_NUMBER (XEXP (value2
.base
, 0)));
2950 case POINTER_PLUS_EXPR
:
2953 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
2954 && compare_constant(TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
2957 case VIEW_CONVERT_EXPR
:
2958 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
2967 /* Make a copy of the whole tree structure for a constant. This
2968 handles the same types of nodes that compare_constant handles. */
2971 copy_constant (tree exp
)
2973 switch (TREE_CODE (exp
))
2976 /* For ADDR_EXPR, we do not want to copy the decl whose address
2977 is requested. We do want to copy constants though. */
2978 if (CONSTANT_CLASS_P (TREE_OPERAND (exp
, 0)))
2979 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
2980 copy_constant (TREE_OPERAND (exp
, 0)));
2982 return copy_node (exp
);
2988 return copy_node (exp
);
2991 return build_complex (TREE_TYPE (exp
),
2992 copy_constant (TREE_REALPART (exp
)),
2993 copy_constant (TREE_IMAGPART (exp
)));
2996 case POINTER_PLUS_EXPR
:
2998 return build2 (TREE_CODE (exp
), TREE_TYPE (exp
),
2999 copy_constant (TREE_OPERAND (exp
, 0)),
3000 copy_constant (TREE_OPERAND (exp
, 1)));
3003 case VIEW_CONVERT_EXPR
:
3004 return build1 (TREE_CODE (exp
), TREE_TYPE (exp
),
3005 copy_constant (TREE_OPERAND (exp
, 0)));
3008 return build_vector (TREE_TYPE (exp
), VECTOR_CST_ELTS (exp
));
3012 tree copy
= copy_node (exp
);
3013 vec
<constructor_elt
, va_gc
> *v
;
3014 unsigned HOST_WIDE_INT idx
;
3015 tree purpose
, value
;
3017 vec_alloc (v
, vec_safe_length (CONSTRUCTOR_ELTS (exp
)));
3018 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (exp
), idx
, purpose
, value
)
3020 constructor_elt ce
= {purpose
, copy_constant (value
)};
3023 CONSTRUCTOR_ELTS (copy
) = v
;
3032 /* Return the section into which constant EXP should be placed. */
3035 get_constant_section (tree exp
, unsigned int align
)
3037 return targetm
.asm_out
.select_section (exp
,
3038 compute_reloc_for_constant (exp
),
3042 /* Return the size of constant EXP in bytes. */
3044 static HOST_WIDE_INT
3045 get_constant_size (tree exp
)
3049 size
= int_size_in_bytes (TREE_TYPE (exp
));
3050 if (TREE_CODE (exp
) == STRING_CST
)
3051 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3055 /* Subroutine of output_constant_def:
3056 No constant equal to EXP is known to have been output.
3057 Make a constant descriptor to enter EXP in the hash table.
3058 Assign the label number and construct RTL to refer to the
3059 constant's location in memory.
3060 Caller is responsible for updating the hash table. */
3062 static struct constant_descriptor_tree
*
3063 build_constant_desc (tree exp
)
3065 struct constant_descriptor_tree
*desc
;
3071 desc
= ggc_alloc_constant_descriptor_tree ();
3072 desc
->value
= copy_constant (exp
);
3074 /* Propagate marked-ness to copied constant. */
3075 if (flag_mudflap
&& mf_marked_p (exp
))
3076 mf_mark (desc
->value
);
3078 /* Create a string containing the label name, in LABEL. */
3079 labelno
= const_labelno
++;
3080 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3082 /* Construct the VAR_DECL associated with the constant. */
3083 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3085 DECL_ARTIFICIAL (decl
) = 1;
3086 DECL_IGNORED_P (decl
) = 1;
3087 TREE_READONLY (decl
) = 1;
3088 TREE_STATIC (decl
) = 1;
3089 TREE_ADDRESSABLE (decl
) = 1;
3090 /* We don't set the RTL yet as this would cause varpool to assume that the
3091 variable is referenced. Moreover, it would just be dropped in LTO mode.
3092 Instead we set the flag that will be recognized in make_decl_rtl. */
3093 DECL_IN_CONSTANT_POOL (decl
) = 1;
3094 DECL_INITIAL (decl
) = desc
->value
;
3095 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3096 architectures so use DATA_ALIGNMENT as well, except for strings. */
3097 if (TREE_CODE (exp
) == STRING_CST
)
3099 #ifdef CONSTANT_ALIGNMENT
3100 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3104 align_variable (decl
, 0);
3106 /* Now construct the SYMBOL_REF and the MEM. */
3107 if (use_object_blocks_p ())
3109 section
*sect
= get_constant_section (exp
, DECL_ALIGN (decl
));
3110 symbol
= create_block_symbol (ggc_strdup (label
),
3111 get_block_for_section (sect
), -1);
3114 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3115 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3116 SET_SYMBOL_REF_DECL (symbol
, decl
);
3117 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3119 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3120 set_mem_attributes (rtl
, exp
, 1);
3121 set_mem_alias_set (rtl
, 0);
3122 set_mem_alias_set (rtl
, const_alias_set
);
3124 /* We cannot share RTX'es in pool entries.
3125 Mark this piece of RTL as required for unsharing. */
3126 RTX_FLAG (rtl
, used
) = 1;
3128 /* Set flags or add text to the name to record information, such as
3129 that it is a local symbol. If the name is changed, the macro
3130 ASM_OUTPUT_LABELREF will have to know how to strip this
3131 information. This call might invalidate our local variable
3132 SYMBOL; we can't use it afterward. */
3133 targetm
.encode_section_info (exp
, rtl
, true);
3140 /* Return an rtx representing a reference to constant data in memory
3141 for the constant expression EXP.
3143 If assembler code for such a constant has already been output,
3144 return an rtx to refer to it.
3145 Otherwise, output such a constant in memory
3146 and generate an rtx for it.
3148 If DEFER is nonzero, this constant can be deferred and output only
3149 if referenced in the function after all optimizations.
3151 `const_desc_table' records which constants already have label strings. */
3154 output_constant_def (tree exp
, int defer
)
3156 struct constant_descriptor_tree
*desc
;
3157 struct constant_descriptor_tree key
;
3160 /* Look up EXP in the table of constant descriptors. If we didn't find
3161 it, create a new one. */
3163 key
.hash
= const_hash_1 (exp
);
3164 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3166 desc
= (struct constant_descriptor_tree
*) *loc
;
3169 desc
= build_constant_desc (exp
);
3170 desc
->hash
= key
.hash
;
3174 maybe_output_constant_def_contents (desc
, defer
);
3178 /* Subroutine of output_constant_def: Decide whether or not we need to
3179 output the constant DESC now, and if so, do it. */
3181 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3184 rtx symbol
= XEXP (desc
->rtl
, 0);
3185 tree exp
= desc
->value
;
3187 if (flag_syntax_only
)
3190 if (TREE_ASM_WRITTEN (exp
))
3191 /* Already output; don't do it again. */
3194 /* We can always defer constants as long as the context allows
3198 /* Increment n_deferred_constants if it exists. It needs to be at
3199 least as large as the number of constants actually referred to
3200 by the function. If it's too small we'll stop looking too early
3201 and fail to emit constants; if it's too large we'll only look
3202 through the entire function when we could have stopped earlier. */
3204 n_deferred_constants
++;
3208 output_constant_def_contents (symbol
);
3211 /* Subroutine of output_constant_def_contents. Output the definition
3212 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3213 constant's alignment in bits. */
3216 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3220 size
= get_constant_size (exp
);
3222 /* Do any machine/system dependent processing of the constant. */
3223 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3225 /* Output the value of EXP. */
3226 output_constant (exp
, size
, align
);
3229 /* We must output the constant data referred to by SYMBOL; do so. */
3232 output_constant_def_contents (rtx symbol
)
3234 tree decl
= SYMBOL_REF_DECL (symbol
);
3235 tree exp
= DECL_INITIAL (decl
);
3238 /* Make sure any other constants whose addresses appear in EXP
3239 are assigned label numbers. */
3240 output_addressed_constants (exp
);
3242 /* We are no longer deferring this constant. */
3243 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3245 /* If the constant is part of an object block, make sure that the
3246 decl has been positioned within its block, but do not write out
3247 its definition yet. output_object_blocks will do that later. */
3248 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3249 place_block_symbol (symbol
);
3252 bool asan_protected
= false;
3253 align
= DECL_ALIGN (decl
);
3254 switch_to_section (get_constant_section (exp
, align
));
3255 if (flag_asan
&& TREE_CODE (exp
) == STRING_CST
3256 && asan_protect_global (exp
))
3258 asan_protected
= true;
3259 align
= MAX (align
, ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3261 if (align
> BITS_PER_UNIT
)
3262 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3263 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3266 HOST_WIDE_INT size
= get_constant_size (exp
);
3267 assemble_zeros (asan_red_zone_size (size
));
3271 mudflap_enqueue_constant (exp
);
3274 /* Look up EXP in the table of constant descriptors. Return the rtl
3275 if it has been emitted, else null. */
3278 lookup_constant_def (tree exp
)
3280 struct constant_descriptor_tree
*desc
;
3281 struct constant_descriptor_tree key
;
3284 key
.hash
= const_hash_1 (exp
);
3285 desc
= (struct constant_descriptor_tree
*)
3286 htab_find_with_hash (const_desc_htab
, &key
, key
.hash
);
3288 return (desc
? desc
->rtl
: NULL_RTX
);
3291 /* Return a tree representing a reference to constant data in memory
3292 for the constant expression EXP.
3294 This is the counterpart of output_constant_def at the Tree level. */
3297 tree_output_constant_def (tree exp
)
3299 struct constant_descriptor_tree
*desc
, key
;
3303 /* Look up EXP in the table of constant descriptors. If we didn't find
3304 it, create a new one. */
3306 key
.hash
= const_hash_1 (exp
);
3307 loc
= htab_find_slot_with_hash (const_desc_htab
, &key
, key
.hash
, INSERT
);
3309 desc
= (struct constant_descriptor_tree
*) *loc
;
3312 desc
= build_constant_desc (exp
);
3313 desc
->hash
= key
.hash
;
3317 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3318 varpool_finalize_decl (decl
);
3322 /* Used in the hash tables to avoid outputting the same constant
3323 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3324 are output once per function, not once per file. */
3325 /* ??? Only a few targets need per-function constant pools. Most
3326 can use one per-file pool. Should add a targetm bit to tell the
3329 struct GTY(()) rtx_constant_pool
{
3330 /* Pointers to first and last constant in pool, as ordered by offset. */
3331 struct constant_descriptor_rtx
*first
;
3332 struct constant_descriptor_rtx
*last
;
3334 /* Hash facility for making memory-constants from constant rtl-expressions.
3335 It is used on RISC machines where immediate integer arguments and
3336 constant addresses are restricted so that such constants must be stored
3338 htab_t
GTY((param_is (struct constant_descriptor_rtx
))) const_rtx_htab
;
3340 /* Current offset in constant pool (does not include any
3341 machine-specific header). */
3342 HOST_WIDE_INT offset
;
3345 struct GTY((chain_next ("%h.next"))) constant_descriptor_rtx
{
3346 struct constant_descriptor_rtx
*next
;
3350 HOST_WIDE_INT offset
;
3352 enum machine_mode mode
;
3358 /* Hash and compare functions for const_rtx_htab. */
3361 const_desc_rtx_hash (const void *ptr
)
3363 const struct constant_descriptor_rtx
*const desc
3364 = (const struct constant_descriptor_rtx
*) ptr
;
3369 const_desc_rtx_eq (const void *a
, const void *b
)
3371 const struct constant_descriptor_rtx
*const x
3372 = (const struct constant_descriptor_rtx
*) a
;
3373 const struct constant_descriptor_rtx
*const y
3374 = (const struct constant_descriptor_rtx
*) b
;
3376 if (x
->mode
!= y
->mode
)
3378 return rtx_equal_p (x
->constant
, y
->constant
);
3381 /* This is the worker function for const_rtx_hash, called via for_each_rtx. */
3384 const_rtx_hash_1 (rtx
*xp
, void *data
)
3386 unsigned HOST_WIDE_INT hwi
;
3387 enum machine_mode mode
;
3393 code
= GET_CODE (x
);
3394 mode
= GET_MODE (x
);
3395 h
= (hashval_t
) code
* 1048573 + mode
;
3403 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3404 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3407 h
^= (hashval_t
) hwi
;
3408 for (i
= 1; i
< n
; ++i
)
3411 h
^= (hashval_t
) hwi
;
3417 if (mode
== VOIDmode
)
3419 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3423 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3427 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3433 for (i
= XVECLEN (x
, 0); i
-- > 0; )
3434 h
= h
* 251 + const_rtx_hash_1 (&XVECEXP (x
, 0, i
), data
);
3439 h
^= htab_hash_string (XSTR (x
, 0));
3443 h
= h
* 251 + CODE_LABEL_NUMBER (XEXP (x
, 0));
3447 case UNSPEC_VOLATILE
:
3448 h
= h
* 251 + XINT (x
, 1);
3455 hp
= (hashval_t
*) data
;
3456 *hp
= *hp
* 509 + h
;
3460 /* Compute a hash value for X, which should be a constant. */
3463 const_rtx_hash (rtx x
)
3466 for_each_rtx (&x
, const_rtx_hash_1
, &h
);
3471 /* Create and return a new rtx constant pool. */
3473 static struct rtx_constant_pool
*
3474 create_constant_pool (void)
3476 struct rtx_constant_pool
*pool
;
3478 pool
= ggc_alloc_rtx_constant_pool ();
3479 pool
->const_rtx_htab
= htab_create_ggc (31, const_desc_rtx_hash
,
3480 const_desc_rtx_eq
, NULL
);
3487 /* Initialize constant pool hashing for a new function. */
3490 init_varasm_status (void)
3492 crtl
->varasm
.pool
= create_constant_pool ();
3493 crtl
->varasm
.deferred_constants
= 0;
3496 /* Given a MINUS expression, simplify it if both sides
3497 include the same symbol. */
3500 simplify_subtraction (rtx x
)
3502 rtx r
= simplify_rtx (x
);
3506 /* Given a constant rtx X, make (or find) a memory constant for its value
3507 and return a MEM rtx to refer to it in memory. */
3510 force_const_mem (enum machine_mode mode
, rtx x
)
3512 struct constant_descriptor_rtx
*desc
, tmp
;
3513 struct rtx_constant_pool
*pool
;
3520 /* If we're not allowed to drop X into the constant pool, don't. */
3521 if (targetm
.cannot_force_const_mem (mode
, x
))
3524 /* Record that this function has used a constant pool entry. */
3525 crtl
->uses_const_pool
= 1;
3527 /* Decide which pool to use. */
3528 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3529 ? shared_constant_pool
3530 : crtl
->varasm
.pool
);
3532 /* Lookup the value in the hashtable. */
3535 hash
= const_rtx_hash (x
);
3536 slot
= htab_find_slot_with_hash (pool
->const_rtx_htab
, &tmp
, hash
, INSERT
);
3537 desc
= (struct constant_descriptor_rtx
*) *slot
;
3539 /* If the constant was already present, return its memory. */
3541 return copy_rtx (desc
->mem
);
3543 /* Otherwise, create a new descriptor. */
3544 desc
= ggc_alloc_constant_descriptor_rtx ();
3547 /* Align the location counter as required by EXP's data type. */
3548 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3549 #ifdef CONSTANT_ALIGNMENT
3551 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3552 if (type
!= NULL_TREE
)
3553 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3557 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3558 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3561 desc
->constant
= copy_rtx (tmp
.constant
);
3562 desc
->offset
= pool
->offset
;
3565 desc
->align
= align
;
3566 desc
->labelno
= const_labelno
;
3569 pool
->offset
+= GET_MODE_SIZE (mode
);
3571 pool
->last
->next
= desc
;
3573 pool
->first
= pool
->last
= desc
;
3576 /* Create a string containing the label name, in LABEL. */
3577 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3580 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3581 the constants pool. */
3582 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3584 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3585 symbol
= create_block_symbol (ggc_strdup (label
),
3586 get_block_for_section (sect
), -1);
3589 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3591 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3592 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3593 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3595 /* Construct the MEM. */
3596 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3597 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3598 set_mem_align (def
, align
);
3600 /* If we're dropping a label to the constant pool, make sure we
3602 if (GET_CODE (x
) == LABEL_REF
)
3603 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3605 return copy_rtx (def
);
3608 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3611 get_pool_constant (rtx addr
)
3613 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3616 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3617 and whether it has been output or not. */
3620 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3622 struct constant_descriptor_rtx
*desc
;
3624 desc
= SYMBOL_REF_CONSTANT (addr
);
3625 *pmarked
= (desc
->mark
!= 0);
3626 return desc
->constant
;
3629 /* Similar, return the mode. */
3632 get_pool_mode (const_rtx addr
)
3634 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3637 /* Return the size of the constant pool. */
3640 get_pool_size (void)
3642 return crtl
->varasm
.pool
->offset
;
3645 /* Worker function for output_constant_pool_1. Emit assembly for X
3646 in MODE with known alignment ALIGN. */
3649 output_constant_pool_2 (enum machine_mode mode
, rtx x
, unsigned int align
)
3651 switch (GET_MODE_CLASS (mode
))
3654 case MODE_DECIMAL_FLOAT
:
3658 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3659 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3660 assemble_real (r
, mode
, align
);
3665 case MODE_PARTIAL_INT
:
3670 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3673 case MODE_VECTOR_FLOAT
:
3674 case MODE_VECTOR_INT
:
3675 case MODE_VECTOR_FRACT
:
3676 case MODE_VECTOR_UFRACT
:
3677 case MODE_VECTOR_ACCUM
:
3678 case MODE_VECTOR_UACCUM
:
3681 enum machine_mode submode
= GET_MODE_INNER (mode
);
3682 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3684 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3685 units
= CONST_VECTOR_NUNITS (x
);
3687 for (i
= 0; i
< units
; i
++)
3689 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3690 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3700 /* Worker function for output_constant_pool. Emit constant DESC,
3701 giving it ALIGN bits of alignment. */
3704 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3711 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3712 whose CODE_LABEL has been deleted. This can occur if a jump table
3713 is eliminated by optimization. If so, write a constant of zero
3714 instead. Note that this can also happen by turning the
3715 CODE_LABEL into a NOTE. */
3716 /* ??? This seems completely and utterly wrong. Certainly it's
3717 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3718 functioning even with INSN_DELETED_P and friends. */
3721 switch (GET_CODE (tmp
))
3724 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3725 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3727 tmp
= XEXP (XEXP (tmp
, 0), 0);
3731 tmp
= XEXP (tmp
, 0);
3732 gcc_assert (!INSN_DELETED_P (tmp
));
3733 gcc_assert (!NOTE_P (tmp
)
3734 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3741 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3742 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3743 align
, desc
->labelno
, done
);
3746 assemble_align (align
);
3748 /* Output the label. */
3749 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3751 /* Output the data. */
3752 output_constant_pool_2 (desc
->mode
, x
, align
);
3754 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3755 sections have proper size. */
3756 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3758 && (in_section
->common
.flags
& SECTION_MERGE
))
3759 assemble_align (align
);
3761 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3767 /* Given a SYMBOL_REF CURRENT_RTX, mark it and all constants it refers
3768 to as used. Emit referenced deferred strings. This function can
3769 be used with for_each_rtx to mark all SYMBOL_REFs in an rtx. */
3772 mark_constant (rtx
*current_rtx
, void *data ATTRIBUTE_UNUSED
)
3774 rtx x
= *current_rtx
;
3776 if (x
== NULL_RTX
|| GET_CODE (x
) != SYMBOL_REF
)
3779 if (CONSTANT_POOL_ADDRESS_P (x
))
3781 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3782 if (desc
->mark
== 0)
3785 for_each_rtx (&desc
->constant
, mark_constant
, NULL
);
3788 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
3790 tree decl
= SYMBOL_REF_DECL (x
);
3791 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
3793 n_deferred_constants
--;
3794 output_constant_def_contents (x
);
3801 /* Look through appropriate parts of INSN, marking all entries in the
3802 constant pool which are actually being used. Entries that are only
3803 referenced by other constants are also marked as used. Emit
3804 deferred strings that are used. */
3807 mark_constants (rtx insn
)
3812 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3813 insns, not any notes that may be attached. We don't want to mark
3814 a constant just because it happens to appear in a REG_EQUIV note. */
3815 if (GET_CODE (PATTERN (insn
)) == SEQUENCE
)
3817 rtx seq
= PATTERN (insn
);
3818 int i
, n
= XVECLEN (seq
, 0);
3819 for (i
= 0; i
< n
; ++i
)
3821 rtx subinsn
= XVECEXP (seq
, 0, i
);
3822 if (INSN_P (subinsn
))
3823 for_each_rtx (&PATTERN (subinsn
), mark_constant
, NULL
);
3827 for_each_rtx (&PATTERN (insn
), mark_constant
, NULL
);
3830 /* Look through the instructions for this function, and mark all the
3831 entries in POOL which are actually being used. Emit deferred constants
3832 which have indeed been used. */
3835 mark_constant_pool (void)
3839 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
3842 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
3843 mark_constants (insn
);
3846 /* Write all the constants in POOL. */
3849 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
3851 struct constant_descriptor_rtx
*desc
;
3853 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
3856 /* If the constant is part of an object_block, make sure that
3857 the constant has been positioned within its block, but do not
3858 write out its definition yet. output_object_blocks will do
3860 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
3861 && SYMBOL_REF_BLOCK (desc
->sym
))
3862 place_block_symbol (desc
->sym
);
3865 switch_to_section (targetm
.asm_out
.select_rtx_section
3866 (desc
->mode
, desc
->constant
, desc
->align
));
3867 output_constant_pool_1 (desc
, desc
->align
);
3872 /* Mark all constants that are used in the current function, then write
3873 out the function's private constant pool. */
3876 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
3877 tree fndecl ATTRIBUTE_UNUSED
)
3879 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
3881 /* It is possible for gcc to call force_const_mem and then to later
3882 discard the instructions which refer to the constant. In such a
3883 case we do not need to output the constant. */
3884 mark_constant_pool ();
3886 #ifdef ASM_OUTPUT_POOL_PROLOGUE
3887 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3890 output_constant_pool_contents (pool
);
3892 #ifdef ASM_OUTPUT_POOL_EPILOGUE
3893 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
3897 /* Write the contents of the shared constant pool. */
3900 output_shared_constant_pool (void)
3902 output_constant_pool_contents (shared_constant_pool
);
3905 /* Determine what kind of relocations EXP may need. */
3908 compute_reloc_for_constant (tree exp
)
3910 int reloc
= 0, reloc2
;
3913 switch (TREE_CODE (exp
))
3917 /* Go inside any operations that get_inner_reference can handle and see
3918 if what's inside is a constant: no need to do anything here for
3919 addresses of variables or functions. */
3920 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3921 tem
= TREE_OPERAND (tem
, 0))
3924 if (TREE_CODE (tem
) == MEM_REF
3925 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
3927 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
3931 if (TREE_PUBLIC (tem
))
3938 case POINTER_PLUS_EXPR
:
3939 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3940 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3944 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3945 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
3946 /* The difference of two local labels is computable at link time. */
3947 if (reloc
== 1 && reloc2
== 1)
3954 case VIEW_CONVERT_EXPR
:
3955 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
3960 unsigned HOST_WIDE_INT idx
;
3961 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
3963 reloc
|= compute_reloc_for_constant (tem
);
3973 /* Find all the constants whose addresses are referenced inside of EXP,
3974 and make sure assembler code with a label has been output for each one.
3975 Indicate whether an ADDR_EXPR has been encountered. */
3978 output_addressed_constants (tree exp
)
3982 switch (TREE_CODE (exp
))
3986 /* Go inside any operations that get_inner_reference can handle and see
3987 if what's inside is a constant: no need to do anything here for
3988 addresses of variables or functions. */
3989 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
3990 tem
= TREE_OPERAND (tem
, 0))
3993 /* If we have an initialized CONST_DECL, retrieve the initializer. */
3994 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
3995 tem
= DECL_INITIAL (tem
);
3997 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
3998 output_constant_def (tem
, 0);
4000 if (TREE_CODE (tem
) == MEM_REF
)
4001 output_addressed_constants (TREE_OPERAND (tem
, 0));
4005 case POINTER_PLUS_EXPR
:
4007 output_addressed_constants (TREE_OPERAND (exp
, 1));
4011 case VIEW_CONVERT_EXPR
:
4012 output_addressed_constants (TREE_OPERAND (exp
, 0));
4017 unsigned HOST_WIDE_INT idx
;
4018 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4020 output_addressed_constants (tem
);
4029 /* Whether a constructor CTOR is a valid static constant initializer if all
4030 its elements are. This used to be internal to initializer_constant_valid_p
4031 and has been exposed to let other functions like categorize_ctor_elements
4032 evaluate the property while walking a constructor for other purposes. */
4035 constructor_static_from_elts_p (const_tree ctor
)
4037 return (TREE_CONSTANT (ctor
)
4038 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4039 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4040 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4043 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4046 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4047 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4048 which are valid when ENDTYPE is an integer of any size; in
4049 particular, this does not accept a pointer minus a constant. This
4050 returns null_pointer_node if the VALUE is an absolute constant
4051 which can be used to initialize a static variable. Otherwise it
4055 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4059 if (!INTEGRAL_TYPE_P (endtype
))
4062 op0
= TREE_OPERAND (value
, 0);
4063 op1
= TREE_OPERAND (value
, 1);
4065 /* Like STRIP_NOPS except allow the operand mode to widen. This
4066 works around a feature of fold that simplifies (int)(p1 - p2) to
4067 ((int)p1 - (int)p2) under the theory that the narrower operation
4070 while (CONVERT_EXPR_P (op0
)
4071 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4073 tree inner
= TREE_OPERAND (op0
, 0);
4074 if (inner
== error_mark_node
4075 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4076 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4077 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4082 while (CONVERT_EXPR_P (op1
)
4083 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4085 tree inner
= TREE_OPERAND (op1
, 0);
4086 if (inner
== error_mark_node
4087 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4088 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4089 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4094 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4098 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4099 cache
? cache
+ 2 : NULL
);
4100 /* Both initializers must be known. */
4104 && (op0
== null_pointer_node
4105 || TREE_CODE (value
) == MINUS_EXPR
))
4106 return null_pointer_node
;
4108 /* Support differences between labels. */
4109 if (TREE_CODE (op0
) == LABEL_DECL
4110 && TREE_CODE (op1
) == LABEL_DECL
)
4111 return null_pointer_node
;
4113 if (TREE_CODE (op0
) == STRING_CST
4114 && TREE_CODE (op1
) == STRING_CST
4115 && operand_equal_p (op0
, op1
, 1))
4116 return null_pointer_node
;
4122 /* Helper function of initializer_constant_valid_p.
4123 Return nonzero if VALUE is a valid constant-valued expression
4124 for use in initializing a static variable; one that can be an
4125 element of a "constant" initializer.
4127 Return null_pointer_node if the value is absolute;
4128 if it is relocatable, return the variable that determines the relocation.
4129 We assume that VALUE has been folded as much as possible;
4130 therefore, we do not need to check for such things as
4131 arithmetic-combinations of integers.
4133 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4136 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4140 switch (TREE_CODE (value
))
4143 if (constructor_static_from_elts_p (value
))
4145 unsigned HOST_WIDE_INT idx
;
4147 bool absolute
= true;
4149 if (cache
&& cache
[0] == value
)
4151 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4154 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4161 cache
[1] = NULL_TREE
;
4165 if (reloc
!= null_pointer_node
)
4168 /* For a non-absolute relocation, there is no single
4169 variable that can be "the variable that determines the
4174 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4176 return absolute
? null_pointer_node
: error_mark_node
;
4179 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4187 return null_pointer_node
;
4192 tree op0
= staticp (TREE_OPERAND (value
, 0));
4195 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4196 to be a constant, this is old-skool offsetof-like nonsense. */
4197 if (TREE_CODE (op0
) == INDIRECT_REF
4198 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4199 return null_pointer_node
;
4200 /* Taking the address of a nested function involves a trampoline,
4201 unless we don't need or want one. */
4202 if (TREE_CODE (op0
) == FUNCTION_DECL
4203 && DECL_STATIC_CHAIN (op0
)
4204 && !TREE_NO_TRAMPOLINE (value
))
4206 /* "&{...}" requires a temporary to hold the constructed
4208 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4214 case NON_LVALUE_EXPR
:
4215 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4218 case VIEW_CONVERT_EXPR
:
4220 tree src
= TREE_OPERAND (value
, 0);
4221 tree src_type
= TREE_TYPE (src
);
4222 tree dest_type
= TREE_TYPE (value
);
4224 /* Allow view-conversions from aggregate to non-aggregate type only
4225 if the bit pattern is fully preserved afterwards; otherwise, the
4226 RTL expander won't be able to apply a subsequent transformation
4227 to the underlying constructor. */
4228 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4230 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4231 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4236 /* Allow all other kinds of view-conversion. */
4237 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4242 tree src
= TREE_OPERAND (value
, 0);
4243 tree src_type
= TREE_TYPE (src
);
4244 tree dest_type
= TREE_TYPE (value
);
4246 /* Allow conversions between pointer types, floating-point
4247 types, and offset types. */
4248 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4249 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4250 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4251 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4252 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4254 /* Allow length-preserving conversions between integer types. */
4255 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4256 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4257 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4259 /* Allow conversions between other integer types only if
4261 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4263 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4264 if (inner
== null_pointer_node
)
4265 return null_pointer_node
;
4269 /* Allow (int) &foo provided int is as wide as a pointer. */
4270 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4271 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4272 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4274 /* Likewise conversions from int to pointers, but also allow
4275 conversions from 0. */
4276 if ((POINTER_TYPE_P (dest_type
)
4277 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4278 && INTEGRAL_TYPE_P (src_type
))
4280 if (TREE_CODE (src
) == INTEGER_CST
4281 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4282 return null_pointer_node
;
4283 if (integer_zerop (src
))
4284 return null_pointer_node
;
4285 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4286 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4289 /* Allow conversions to struct or union types if the value
4291 if (TREE_CODE (dest_type
) == RECORD_TYPE
4292 || TREE_CODE (dest_type
) == UNION_TYPE
)
4293 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4297 case POINTER_PLUS_EXPR
:
4299 /* Any valid floating-point constants will have been folded by now;
4300 with -frounding-math we hit this with addition of two constants. */
4301 if (TREE_CODE (endtype
) == REAL_TYPE
)
4303 if (cache
&& cache
[0] == value
)
4305 if (! INTEGRAL_TYPE_P (endtype
)
4306 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4308 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4310 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4313 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4314 endtype
, ncache
+ 2);
4315 /* If either term is absolute, use the other term's relocation. */
4316 if (valid0
== null_pointer_node
)
4318 else if (valid1
== null_pointer_node
)
4320 /* Support narrowing pointer differences. */
4322 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4326 /* Support narrowing pointer differences. */
4327 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4336 if (TREE_CODE (endtype
) == REAL_TYPE
)
4338 if (cache
&& cache
[0] == value
)
4340 if (! INTEGRAL_TYPE_P (endtype
)
4341 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4343 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4345 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4348 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4349 endtype
, ncache
+ 2);
4350 /* Win if second argument is absolute. */
4351 if (valid1
== null_pointer_node
)
4353 /* Win if both arguments have the same relocation.
4354 Then the value is absolute. */
4355 else if (valid0
== valid1
&& valid0
!= 0)
4356 ret
= null_pointer_node
;
4357 /* Since GCC guarantees that string constants are unique in the
4358 generated code, a subtraction between two copies of the same
4359 constant string is absolute. */
4360 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4361 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4362 && operand_equal_p (valid0
, valid1
, 1))
4363 ret
= null_pointer_node
;
4364 /* Support narrowing differences. */
4366 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4370 /* Support narrowing differences. */
4371 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4386 /* Return nonzero if VALUE is a valid constant-valued expression
4387 for use in initializing a static variable; one that can be an
4388 element of a "constant" initializer.
4390 Return null_pointer_node if the value is absolute;
4391 if it is relocatable, return the variable that determines the relocation.
4392 We assume that VALUE has been folded as much as possible;
4393 therefore, we do not need to check for such things as
4394 arithmetic-combinations of integers. */
4396 initializer_constant_valid_p (tree value
, tree endtype
)
4398 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4401 /* Return true if VALUE is a valid constant-valued expression
4402 for use in initializing a static bit-field; one that can be
4403 an element of a "constant" initializer. */
4406 initializer_constant_valid_for_bitfield_p (tree value
)
4408 /* For bitfields we support integer constants or possibly nested aggregates
4410 switch (TREE_CODE (value
))
4414 unsigned HOST_WIDE_INT idx
;
4417 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4418 if (!initializer_constant_valid_for_bitfield_p (elt
))
4427 case VIEW_CONVERT_EXPR
:
4428 case NON_LVALUE_EXPR
:
4430 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4439 /* output_constructor outer state of relevance in recursive calls, typically
4440 for nested aggregate bitfields. */
4443 unsigned int bit_offset
; /* current position in ... */
4444 int byte
; /* ... the outer byte buffer. */
4447 static unsigned HOST_WIDE_INT
4448 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4451 /* Output assembler code for constant EXP to FILE, with no label.
4452 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4453 Assumes output_addressed_constants has been done on EXP already.
4455 Generate exactly SIZE bytes of assembler data, padding at the end
4456 with zeros if necessary. SIZE must always be specified.
4458 SIZE is important for structure constructors,
4459 since trailing members may have been omitted from the constructor.
4460 It is also important for initialization of arrays from string constants
4461 since the full length of the string constant might not be wanted.
4462 It is also needed for initialization of unions, where the initializer's
4463 type is just one member, and that may not be as long as the union.
4465 There a case in which we would fail to output exactly SIZE bytes:
4466 for a structure constructor that wants to produce more than SIZE bytes.
4467 But such constructors will never be generated for any possible input.
4469 ALIGN is the alignment of the data in bits. */
4472 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4474 enum tree_code code
;
4475 unsigned HOST_WIDE_INT thissize
;
4477 if (size
== 0 || flag_syntax_only
)
4480 /* See if we're trying to initialize a pointer in a non-default mode
4481 to the address of some declaration somewhere. If the target says
4482 the mode is valid for pointers, assume the target has a way of
4484 if (TREE_CODE (exp
) == NOP_EXPR
4485 && POINTER_TYPE_P (TREE_TYPE (exp
))
4486 && targetm
.addr_space
.valid_pointer_mode
4487 (TYPE_MODE (TREE_TYPE (exp
)),
4488 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4490 tree saved_type
= TREE_TYPE (exp
);
4492 /* Peel off any intermediate conversions-to-pointer for valid
4494 while (TREE_CODE (exp
) == NOP_EXPR
4495 && POINTER_TYPE_P (TREE_TYPE (exp
))
4496 && targetm
.addr_space
.valid_pointer_mode
4497 (TYPE_MODE (TREE_TYPE (exp
)),
4498 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4499 exp
= TREE_OPERAND (exp
, 0);
4501 /* If what we're left with is the address of something, we can
4502 convert the address to the final type and output it that
4504 if (TREE_CODE (exp
) == ADDR_EXPR
)
4505 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4506 /* Likewise for constant ints. */
4507 else if (TREE_CODE (exp
) == INTEGER_CST
)
4508 exp
= build_int_cst_wide (saved_type
, TREE_INT_CST_LOW (exp
),
4509 TREE_INT_CST_HIGH (exp
));
4513 /* Eliminate any conversions since we'll be outputting the underlying
4515 while (CONVERT_EXPR_P (exp
)
4516 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4517 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4519 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4520 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4522 /* Make sure eliminating the conversion is really a no-op, except with
4523 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4524 union types to allow for Ada unchecked unions. */
4525 if (type_size
> op_size
4526 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4527 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4528 /* Keep the conversion. */
4531 exp
= TREE_OPERAND (exp
, 0);
4534 code
= TREE_CODE (TREE_TYPE (exp
));
4535 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4537 /* Allow a constructor with no elements for any data type.
4538 This means to fill the space with zeros. */
4539 if (TREE_CODE (exp
) == CONSTRUCTOR
4540 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4542 assemble_zeros (size
);
4546 if (TREE_CODE (exp
) == FDESC_EXPR
)
4548 #ifdef ASM_OUTPUT_FDESC
4549 HOST_WIDE_INT part
= tree_low_cst (TREE_OPERAND (exp
, 1), 0);
4550 tree decl
= TREE_OPERAND (exp
, 0);
4551 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4558 /* Now output the underlying data. If we've handling the padding, return.
4559 Otherwise, break and ensure SIZE is the size written. */
4566 case REFERENCE_TYPE
:
4568 case FIXED_POINT_TYPE
:
4569 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4570 EXPAND_INITIALIZER
),
4571 MIN (size
, thissize
), align
, 0))
4572 error ("initializer for integer/fixed-point value is too complicated");
4576 if (TREE_CODE (exp
) != REAL_CST
)
4577 error ("initializer for floating value is not a floating constant");
4579 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4583 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4584 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4585 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4590 switch (TREE_CODE (exp
))
4593 output_constructor (exp
, size
, align
, NULL
);
4596 thissize
= MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
),
4598 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4604 unsigned int i
, nalign
;
4605 enum machine_mode inner
;
4607 inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4608 nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4610 elt_size
= GET_MODE_SIZE (inner
);
4612 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4613 thissize
= elt_size
;
4614 for (i
= 1; i
< VECTOR_CST_NELTS (exp
); ++i
)
4616 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4617 thissize
+= elt_size
;
4628 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4629 output_constructor (exp
, size
, align
, NULL
);
4639 if (size
> thissize
)
4640 assemble_zeros (size
- thissize
);
4644 /* Subroutine of output_constructor, used for computing the size of
4645 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4646 type with an unspecified upper bound. */
4648 static unsigned HOST_WIDE_INT
4649 array_size_for_constructor (tree val
)
4652 unsigned HOST_WIDE_INT cnt
;
4653 tree index
, value
, tmp
;
4656 /* This code used to attempt to handle string constants that are not
4657 arrays of single-bytes, but nothing else does, so there's no point in
4659 if (TREE_CODE (val
) == STRING_CST
)
4660 return TREE_STRING_LENGTH (val
);
4662 max_index
= NULL_TREE
;
4663 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4665 if (TREE_CODE (index
) == RANGE_EXPR
)
4666 index
= TREE_OPERAND (index
, 1);
4667 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4671 if (max_index
== NULL_TREE
)
4674 /* Compute the total number of array elements. */
4675 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4676 i
= tree_to_double_int (max_index
) - tree_to_double_int (tmp
);
4677 i
+= double_int_one
;
4679 /* Multiply by the array element unit size to find number of bytes. */
4680 i
*= tree_to_double_int (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4682 gcc_assert (i
.fits_uhwi ());
4686 /* Other datastructures + helpers for output_constructor. */
4688 /* output_constructor local state to support interaction with helpers. */
4692 /* Received arguments. */
4693 tree exp
; /* Constructor expression. */
4694 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4695 unsigned int align
; /* Known initial alignment. */
4697 /* Constructor expression data. */
4698 tree type
; /* Expression type. */
4699 tree field
; /* Current field decl in a record. */
4700 tree min_index
; /* Lower bound if specified for an array. */
4702 /* Output processing state. */
4703 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4704 bool byte_buffer_in_use
; /* Whether byte ... */
4705 int byte
; /* ... contains part of a bitfield byte yet to
4708 int last_relative_index
; /* Implicit or explicit index of the last
4709 array element output within a bitfield. */
4710 /* Current element. */
4711 tree val
; /* Current element value. */
4712 tree index
; /* Current element index. */
4716 /* Helper for output_constructor. From the current LOCAL state, output a
4717 RANGE_EXPR element. */
4720 output_constructor_array_range (oc_local_state
*local
)
4722 unsigned HOST_WIDE_INT fieldsize
4723 = int_size_in_bytes (TREE_TYPE (local
->type
));
4725 HOST_WIDE_INT lo_index
4726 = tree_low_cst (TREE_OPERAND (local
->index
, 0), 0);
4727 HOST_WIDE_INT hi_index
4728 = tree_low_cst (TREE_OPERAND (local
->index
, 1), 0);
4729 HOST_WIDE_INT index
;
4732 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4734 for (index
= lo_index
; index
<= hi_index
; index
++)
4736 /* Output the element's initial value. */
4737 if (local
->val
== NULL_TREE
)
4738 assemble_zeros (fieldsize
);
4740 output_constant (local
->val
, fieldsize
, align2
);
4742 /* Count its size. */
4743 local
->total_bytes
+= fieldsize
;
4747 /* Helper for output_constructor. From the current LOCAL state, output a
4748 field element that is not true bitfield or part of an outer one. */
4751 output_constructor_regular_field (oc_local_state
*local
)
4753 /* Field size and position. Since this structure is static, we know the
4754 positions are constant. */
4755 unsigned HOST_WIDE_INT fieldsize
;
4756 HOST_WIDE_INT fieldpos
;
4758 unsigned int align2
;
4760 if (local
->index
!= NULL_TREE
)
4762 /* Perform the index calculation in modulo arithmetic but
4763 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4764 but we are using an unsigned sizetype. */
4765 unsigned prec
= TYPE_PRECISION (sizetype
);
4766 double_int idx
= tree_to_double_int (local
->index
)
4767 - tree_to_double_int (local
->min_index
);
4768 idx
= idx
.sext (prec
);
4769 fieldpos
= (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
)), 1)
4772 else if (local
->field
!= NULL_TREE
)
4773 fieldpos
= int_byte_position (local
->field
);
4777 /* Output any buffered-up bit-fields preceding this element. */
4778 if (local
->byte_buffer_in_use
)
4780 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4781 local
->total_bytes
++;
4782 local
->byte_buffer_in_use
= false;
4785 /* Advance to offset of this element.
4786 Note no alignment needed in an array, since that is guaranteed
4787 if each element has the proper size. */
4788 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4789 && fieldpos
!= local
->total_bytes
)
4791 gcc_assert (fieldpos
>= local
->total_bytes
);
4792 assemble_zeros (fieldpos
- local
->total_bytes
);
4793 local
->total_bytes
= fieldpos
;
4796 /* Find the alignment of this element. */
4797 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4799 /* Determine size this element should occupy. */
4804 /* If this is an array with an unspecified upper bound,
4805 the initializer determines the size. */
4806 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4807 but we cannot do this until the deprecated support for
4808 initializing zero-length array members is removed. */
4809 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
4810 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
4811 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
4813 fieldsize
= array_size_for_constructor (local
->val
);
4814 /* Given a non-empty initialization, this field had
4816 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
4819 fieldsize
= tree_low_cst (DECL_SIZE_UNIT (local
->field
), 1);
4822 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
4824 /* Output the element's initial value. */
4825 if (local
->val
== NULL_TREE
)
4826 assemble_zeros (fieldsize
);
4828 output_constant (local
->val
, fieldsize
, align2
);
4830 /* Count its size. */
4831 local
->total_bytes
+= fieldsize
;
4834 /* Helper for output_constructor. From the current LOCAL and OUTER states,
4835 output an element that is a true bitfield or part of an outer one. */
4838 output_constructor_bitfield (oc_local_state
*local
, oc_outer_state
*outer
)
4840 /* Bit size of this element. */
4841 HOST_WIDE_INT ebitsize
4843 ? tree_low_cst (DECL_SIZE (local
->field
), 1)
4844 : tree_low_cst (TYPE_SIZE (TREE_TYPE (local
->type
)), 1));
4846 /* Relative index of this element if this is an array component. */
4847 HOST_WIDE_INT relative_index
4850 ? (tree_low_cst (local
->index
, 0)
4851 - tree_low_cst (local
->min_index
, 0))
4852 : local
->last_relative_index
+ 1)
4855 /* Bit position of this element from the start of the containing
4857 HOST_WIDE_INT constructor_relative_ebitpos
4859 ? int_bit_position (local
->field
)
4860 : ebitsize
* relative_index
);
4862 /* Bit position of this element from the start of a possibly ongoing
4863 outer byte buffer. */
4864 HOST_WIDE_INT byte_relative_ebitpos
4865 = ((outer
? outer
->bit_offset
: 0) + constructor_relative_ebitpos
);
4867 /* From the start of a possibly ongoing outer byte buffer, offsets to
4868 the first bit of this element and to the first bit past the end of
4870 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
4871 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
4873 local
->last_relative_index
= relative_index
;
4875 if (local
->val
== NULL_TREE
)
4876 local
->val
= integer_zero_node
;
4878 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
4879 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
4880 local
->val
= TREE_OPERAND (local
->val
, 0);
4882 if (TREE_CODE (local
->val
) != INTEGER_CST
4883 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
4885 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
4889 /* If this field does not start in this (or, next) byte,
4891 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4893 /* Output remnant of any bit field in previous bytes. */
4894 if (local
->byte_buffer_in_use
)
4896 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4897 local
->total_bytes
++;
4898 local
->byte_buffer_in_use
= false;
4901 /* If still not at proper byte, advance to there. */
4902 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
4904 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
4905 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
4906 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
4910 /* Set up the buffer if necessary. */
4911 if (!local
->byte_buffer_in_use
)
4915 local
->byte_buffer_in_use
= true;
4918 /* If this is nested constructor, recurse passing the bit offset and the
4919 pending data, then retrieve the new pending data afterwards. */
4920 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
4922 oc_outer_state output_state
;
4924 output_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
4925 output_state
.byte
= local
->byte
;
4927 += output_constructor (local
->val
, 0, 0, &output_state
);
4928 local
->byte
= output_state
.byte
;
4932 /* Otherwise, we must split the element into pieces that fall within
4933 separate bytes, and combine each byte with previous or following
4935 while (next_offset
< end_offset
)
4939 HOST_WIDE_INT value
;
4940 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
4941 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
4943 /* Advance from byte to byte
4944 within this element when necessary. */
4945 while (next_byte
!= local
->total_bytes
)
4947 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4948 local
->total_bytes
++;
4952 /* Number of bits we can process at once
4953 (all part of the same byte). */
4954 this_time
= MIN (end_offset
- next_offset
,
4955 BITS_PER_UNIT
- next_bit
);
4956 if (BYTES_BIG_ENDIAN
)
4958 /* On big-endian machine, take the most significant bits
4959 first (of the bits that are significant)
4960 and put them into bytes from the most significant end. */
4961 shift
= end_offset
- next_offset
- this_time
;
4963 /* Don't try to take a bunch of bits that cross
4964 the word boundary in the INTEGER_CST. We can
4965 only select bits from the LOW or HIGH part
4967 if (shift
< HOST_BITS_PER_WIDE_INT
4968 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
4970 this_time
= shift
+ this_time
- HOST_BITS_PER_WIDE_INT
;
4971 shift
= HOST_BITS_PER_WIDE_INT
;
4974 /* Now get the bits from the appropriate constant word. */
4975 if (shift
< HOST_BITS_PER_WIDE_INT
)
4976 value
= TREE_INT_CST_LOW (local
->val
);
4979 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
4980 value
= TREE_INT_CST_HIGH (local
->val
);
4981 shift
-= HOST_BITS_PER_WIDE_INT
;
4984 /* Get the result. This works only when:
4985 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
4986 local
->byte
|= (((value
>> shift
)
4987 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
4988 << (BITS_PER_UNIT
- this_time
- next_bit
));
4992 /* On little-endian machines,
4993 take first the least significant bits of the value
4994 and pack them starting at the least significant
4995 bits of the bytes. */
4996 shift
= next_offset
- byte_relative_ebitpos
;
4998 /* Don't try to take a bunch of bits that cross
4999 the word boundary in the INTEGER_CST. We can
5000 only select bits from the LOW or HIGH part
5002 if (shift
< HOST_BITS_PER_WIDE_INT
5003 && shift
+ this_time
> HOST_BITS_PER_WIDE_INT
)
5004 this_time
= (HOST_BITS_PER_WIDE_INT
- shift
);
5006 /* Now get the bits from the appropriate constant word. */
5007 if (shift
< HOST_BITS_PER_WIDE_INT
)
5008 value
= TREE_INT_CST_LOW (local
->val
);
5011 gcc_assert (shift
< HOST_BITS_PER_DOUBLE_INT
);
5012 value
= TREE_INT_CST_HIGH (local
->val
);
5013 shift
-= HOST_BITS_PER_WIDE_INT
;
5016 /* Get the result. This works only when:
5017 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5018 local
->byte
|= (((value
>> shift
)
5019 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5023 next_offset
+= this_time
;
5024 local
->byte_buffer_in_use
= true;
5028 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5029 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5030 caller output state of relevance in recursive invocations. */
5032 static unsigned HOST_WIDE_INT
5033 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5034 unsigned int align
, oc_outer_state
* outer
)
5036 unsigned HOST_WIDE_INT cnt
;
5037 constructor_elt
*ce
;
5039 oc_local_state local
;
5041 /* Setup our local state to communicate with helpers. */
5044 local
.align
= align
;
5046 local
.total_bytes
= 0;
5047 local
.byte_buffer_in_use
= outer
!= NULL
;
5048 local
.byte
= outer
? outer
->byte
: 0;
5050 local
.type
= TREE_TYPE (exp
);
5052 local
.last_relative_index
= -1;
5054 local
.min_index
= NULL_TREE
;
5055 if (TREE_CODE (local
.type
) == ARRAY_TYPE
5056 && TYPE_DOMAIN (local
.type
) != NULL_TREE
)
5057 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5059 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5061 /* As CE goes through the elements of the constant, FIELD goes through the
5062 structure fields if the constant is a structure. If the constant is a
5063 union, we override this by getting the field from the TREE_LIST element.
5064 But the constant could also be an array. Then FIELD is zero.
5066 There is always a maximum of one element in the chain LINK for unions
5067 (even if the initializer in a source program incorrectly contains
5070 local
.field
= NULL_TREE
;
5071 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5072 local
.field
= TYPE_FIELDS (local
.type
);
5075 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5076 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5078 local
.val
= ce
->value
;
5079 local
.index
= NULL_TREE
;
5081 /* The element in a union constructor specifies the proper field
5083 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5084 local
.field
= ce
->index
;
5086 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5087 local
.index
= ce
->index
;
5089 if (local
.field
&& flag_verbose_asm
)
5090 fprintf (asm_out_file
, "%s %s:\n",
5092 DECL_NAME (local
.field
)
5093 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5096 /* Eliminate the marker that makes a cast not be an lvalue. */
5097 if (local
.val
!= NULL_TREE
)
5098 STRIP_NOPS (local
.val
);
5100 /* Output the current element, using the appropriate helper ... */
5102 /* For an array slice not part of an outer bitfield. */
5104 && local
.index
!= NULL_TREE
5105 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5106 output_constructor_array_range (&local
);
5108 /* For a field that is neither a true bitfield nor part of an outer one,
5109 known to be at least byte aligned and multiple-of-bytes long. */
5111 && (local
.field
== NULL_TREE
5112 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5113 output_constructor_regular_field (&local
);
5115 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5116 supported for scalar fields, so we may need to convert first. */
5119 if (TREE_CODE (local
.val
) == REAL_CST
)
5121 = fold_unary (VIEW_CONVERT_EXPR
,
5122 build_nonstandard_integer_type
5123 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5125 output_constructor_bitfield (&local
, outer
);
5129 /* If we are not at toplevel, save the pending data for our caller.
5130 Otherwise output the pending data and padding zeros as needed. */
5132 outer
->byte
= local
.byte
;
5135 if (local
.byte_buffer_in_use
)
5137 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5138 local
.total_bytes
++;
5141 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5143 assemble_zeros (local
.size
- local
.total_bytes
);
5144 local
.total_bytes
= local
.size
;
5148 return local
.total_bytes
;
5151 /* Mark DECL as weak. */
5154 mark_weak (tree decl
)
5156 DECL_WEAK (decl
) = 1;
5158 if (DECL_RTL_SET_P (decl
)
5159 && MEM_P (DECL_RTL (decl
))
5160 && XEXP (DECL_RTL (decl
), 0)
5161 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5162 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5165 /* Merge weak status between NEWDECL and OLDDECL. */
5168 merge_weak (tree newdecl
, tree olddecl
)
5170 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5172 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5175 /* We put the NEWDECL on the weak_decls list at some point
5176 and OLDDECL as well. Keep just OLDDECL on the list. */
5177 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5178 if (TREE_VALUE (*pwd
) == newdecl
)
5180 *pwd
= TREE_CHAIN (*pwd
);
5187 if (DECL_WEAK (newdecl
))
5191 /* NEWDECL is weak, but OLDDECL is not. */
5193 /* If we already output the OLDDECL, we're in trouble; we can't
5194 go back and make it weak. This should never happen in
5195 unit-at-a-time compilation. */
5196 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5198 /* If we've already generated rtl referencing OLDDECL, we may
5199 have done so in a way that will not function properly with
5200 a weak symbol. Again in unit-at-a-time this should be
5202 gcc_assert (!TREE_USED (olddecl
)
5203 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5205 if (TARGET_SUPPORTS_WEAK
)
5207 /* We put the NEWDECL on the weak_decls list at some point.
5208 Replace it with the OLDDECL. */
5209 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5210 if (TREE_VALUE (wd
) == newdecl
)
5212 TREE_VALUE (wd
) = olddecl
;
5215 /* We may not find the entry on the list. If NEWDECL is a
5216 weak alias, then we will have already called
5217 globalize_decl to remove the entry; in that case, we do
5218 not need to do anything. */
5221 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5222 mark_weak (olddecl
);
5225 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5226 weak. Just update NEWDECL to indicate that it's weak too. */
5227 mark_weak (newdecl
);
5230 /* Declare DECL to be a weak symbol. */
5233 declare_weak (tree decl
)
5235 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5236 if (! TREE_PUBLIC (decl
))
5237 error ("weak declaration of %q+D must be public", decl
);
5238 else if (!TARGET_SUPPORTS_WEAK
)
5239 warning (0, "weak declaration of %q+D not supported", decl
);
5242 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5243 DECL_ATTRIBUTES (decl
)
5244 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5248 weak_finish_1 (tree decl
)
5250 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5251 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5254 if (! TREE_USED (decl
))
5257 #ifdef ASM_WEAKEN_DECL
5258 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5260 #ifdef ASM_WEAKEN_LABEL
5261 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5263 #ifdef ASM_OUTPUT_WEAK_ALIAS
5265 static bool warn_once
= 0;
5268 warning (0, "only weak aliases are supported in this configuration");
5278 /* Fiven an assembly name, find the decl it is associated with. */
5280 find_decl (tree target
)
5282 symtab_node node
= symtab_node_for_asm (target
);
5284 return node
->symbol
.decl
;
5288 /* This TREE_LIST contains weakref targets. */
5290 static GTY(()) tree weakref_targets
;
5292 /* Emit any pending weak declarations. */
5299 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5301 tree alias_decl
= TREE_PURPOSE (t
);
5302 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5304 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5305 /* Remove alias_decl from the weak list, but leave entries for
5306 the target alone. */
5308 #ifndef ASM_OUTPUT_WEAKREF
5309 else if (! TREE_SYMBOL_REFERENCED (target
))
5311 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5312 defined, otherwise we and weak_finish_1 would use
5313 different macros. */
5314 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5315 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5317 tree decl
= find_decl (target
);
5321 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5322 TREE_CODE (alias_decl
), target
,
5323 TREE_TYPE (alias_decl
));
5325 DECL_EXTERNAL (decl
) = 1;
5326 TREE_PUBLIC (decl
) = 1;
5327 DECL_ARTIFICIAL (decl
) = 1;
5328 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5329 TREE_USED (decl
) = 1;
5332 weak_finish_1 (decl
);
5341 /* Remove the alias and the target from the pending weak list
5342 so that we do not emit any .weak directives for the former,
5343 nor multiple .weak directives for the latter. */
5344 for (p
= &weak_decls
; (t2
= *p
) ; )
5346 if (TREE_VALUE (t2
) == alias_decl
5347 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5348 *p
= TREE_CHAIN (t2
);
5350 p
= &TREE_CHAIN (t2
);
5353 /* Remove other weakrefs to the same target, to speed things up. */
5354 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5356 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5357 *p
= TREE_CHAIN (t2
);
5359 p
= &TREE_CHAIN (t2
);
5364 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5366 tree decl
= TREE_VALUE (t
);
5368 weak_finish_1 (decl
);
5372 /* Emit the assembly bits to indicate that DECL is globally visible. */
5375 globalize_decl (tree decl
)
5378 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5379 if (DECL_WEAK (decl
))
5381 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5384 #ifdef ASM_WEAKEN_DECL
5385 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5387 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5390 /* Remove this function from the pending weak list so that
5391 we do not emit multiple .weak directives for it. */
5392 for (p
= &weak_decls
; (t
= *p
) ; )
5394 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5395 *p
= TREE_CHAIN (t
);
5397 p
= &TREE_CHAIN (t
);
5400 /* Remove weakrefs to the same target from the pending weakref
5401 list, for the same reason. */
5402 for (p
= &weakref_targets
; (t
= *p
) ; )
5404 if (DECL_ASSEMBLER_NAME (decl
)
5405 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5406 *p
= TREE_CHAIN (t
);
5408 p
= &TREE_CHAIN (t
);
5415 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5418 vec
<alias_pair
, va_gc
> *alias_pairs
;
5420 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5421 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5422 tree node is DECL to have the value of the tree node TARGET. */
5425 do_assemble_alias (tree decl
, tree target
)
5427 /* Emulated TLS had better not get this var. */
5428 gcc_assert(!(!targetm
.have_tls
5429 && TREE_CODE (decl
) == VAR_DECL
5430 && DECL_THREAD_LOCAL_P (decl
)));
5432 if (TREE_ASM_WRITTEN (decl
))
5435 /* We must force creation of DECL_RTL for debug info generation, even though
5436 we don't use it here. */
5437 make_decl_rtl (decl
);
5439 TREE_ASM_WRITTEN (decl
) = 1;
5440 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5442 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5444 ultimate_transparent_alias_target (&target
);
5446 if (!TREE_SYMBOL_REFERENCED (target
))
5447 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5449 #ifdef ASM_OUTPUT_WEAKREF
5450 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5451 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5452 IDENTIFIER_POINTER (target
));
5454 if (!TARGET_SUPPORTS_WEAK
)
5456 error_at (DECL_SOURCE_LOCATION (decl
),
5457 "weakref is not supported in this configuration");
5464 #ifdef ASM_OUTPUT_DEF
5465 /* Make name accessible from other files, if appropriate. */
5467 if (TREE_PUBLIC (decl
))
5469 globalize_decl (decl
);
5470 maybe_assemble_visibility (decl
);
5472 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5474 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE) && HAVE_GNU_INDIRECT_FUNCTION
5475 ASM_OUTPUT_TYPE_DIRECTIVE
5476 (asm_out_file
, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5479 error_at (DECL_SOURCE_LOCATION (decl
),
5480 "ifunc is not supported in this configuration");
5484 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5485 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5487 ASM_OUTPUT_DEF (asm_out_file
,
5488 IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
)),
5489 IDENTIFIER_POINTER (target
));
5491 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5496 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5497 # ifdef ASM_WEAKEN_DECL
5498 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5500 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5502 /* Remove this function from the pending weak list so that
5503 we do not emit multiple .weak directives for it. */
5504 for (p
= &weak_decls
; (t
= *p
) ; )
5505 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5506 *p
= TREE_CHAIN (t
);
5508 p
= &TREE_CHAIN (t
);
5510 /* Remove weakrefs to the same target from the pending weakref
5511 list, for the same reason. */
5512 for (p
= &weakref_targets
; (t
= *p
) ; )
5514 if (DECL_ASSEMBLER_NAME (decl
)
5515 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5516 *p
= TREE_CHAIN (t
);
5518 p
= &TREE_CHAIN (t
);
5524 /* Emit an assembler directive to make the symbol for DECL an alias to
5525 the symbol for TARGET. */
5528 assemble_alias (tree decl
, tree target
)
5532 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5534 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5536 ultimate_transparent_alias_target (&target
);
5538 if (alias
== target
)
5539 error ("weakref %q+D ultimately targets itself", decl
);
5542 #ifndef ASM_OUTPUT_WEAKREF
5543 IDENTIFIER_TRANSPARENT_ALIAS (alias
) = 1;
5544 TREE_CHAIN (alias
) = target
;
5547 if (TREE_PUBLIC (decl
))
5548 error ("weakref %q+D must have static linkage", decl
);
5552 #if !defined (ASM_OUTPUT_DEF)
5553 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5554 error_at (DECL_SOURCE_LOCATION (decl
),
5555 "alias definitions not supported in this configuration");
5558 if (!DECL_WEAK (decl
))
5560 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5561 error_at (DECL_SOURCE_LOCATION (decl
),
5562 "ifunc is not supported in this configuration");
5564 error_at (DECL_SOURCE_LOCATION (decl
),
5565 "only weak aliases are supported in this configuration");
5571 TREE_USED (decl
) = 1;
5573 /* Allow aliases to aliases. */
5574 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5575 cgraph_get_create_node (decl
)->alias
= true;
5577 varpool_node_for_decl (decl
)->alias
= true;
5579 /* If the target has already been emitted, we don't have to queue the
5580 alias. This saves a tad of memory. */
5581 if (cgraph_global_info_ready
)
5582 target_decl
= find_decl (target
);
5585 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5586 || cgraph_state
>= CGRAPH_STATE_EXPANSION
)
5587 do_assemble_alias (decl
, target
);
5590 alias_pair p
= {decl
, target
};
5591 vec_safe_push (alias_pairs
, p
);
5595 /* Record and output a table of translations from original function
5596 to its transaction aware clone. Note that tm_pure functions are
5597 considered to be their own clone. */
5599 static GTY((if_marked ("tree_map_marked_p"), param_is (struct tree_map
)))
5600 htab_t tm_clone_hash
;
5603 record_tm_clone_pair (tree o
, tree n
)
5605 struct tree_map
**slot
, *h
;
5607 if (tm_clone_hash
== NULL
)
5608 tm_clone_hash
= htab_create_ggc (32, tree_map_hash
, tree_map_eq
, 0);
5610 h
= ggc_alloc_tree_map ();
5611 h
->hash
= htab_hash_pointer (o
);
5615 slot
= (struct tree_map
**)
5616 htab_find_slot_with_hash (tm_clone_hash
, h
, h
->hash
, INSERT
);
5621 get_tm_clone_pair (tree o
)
5625 struct tree_map
*h
, in
;
5628 in
.hash
= htab_hash_pointer (o
);
5629 h
= (struct tree_map
*) htab_find_with_hash (tm_clone_hash
,
5637 typedef struct tm_alias_pair
5645 /* Helper function for finish_tm_clone_pairs. Dump a hash table entry
5646 into a VEC in INFO. */
5649 dump_tm_clone_to_vec (void **slot
, void *info
)
5651 struct tree_map
*map
= (struct tree_map
*) *slot
;
5652 vec
<tm_alias_pair
> *tm_alias_pairs
= (vec
<tm_alias_pair
> *) info
;
5653 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5654 tm_alias_pairs
->safe_push (p
);
5658 /* Dump the actual pairs to the .tm_clone_table section. */
5661 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5665 bool switched
= false;
5667 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5671 struct cgraph_node
*src_n
= cgraph_get_node (src
);
5672 struct cgraph_node
*dst_n
= cgraph_get_node (dst
);
5674 /* The function ipa_tm_create_version() marks the clone as needed if
5675 the original function was needed. But we also mark the clone as
5676 needed if we ever called the clone indirectly through
5677 TM_GETTMCLONE. If neither of these are true, we didn't generate
5678 a clone, and we didn't call it indirectly... no sense keeping it
5679 in the clone table. */
5680 if (!dst_n
|| !dst_n
->analyzed
)
5683 /* This covers the case where we have optimized the original
5684 function away, and only access the transactional clone. */
5685 if (!src_n
|| !src_n
->analyzed
)
5690 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5691 assemble_align (POINTER_SIZE
);
5695 assemble_integer (XEXP (DECL_RTL (src
), 0),
5696 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5697 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5698 POINTER_SIZE
/ BITS_PER_UNIT
, POINTER_SIZE
, 1);
5702 /* Provide a default for the tm_clone_table section. */
5705 default_clone_table_section (void)
5707 return get_named_section (NULL
, ".tm_clone_table", 3);
5710 /* Helper comparison function for qsorting by the DECL_UID stored in
5711 alias_pair->emitted_diags. */
5714 tm_alias_pair_cmp (const void *x
, const void *y
)
5716 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5717 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5718 if (p1
->uid
< p2
->uid
)
5720 if (p1
->uid
> p2
->uid
)
5726 finish_tm_clone_pairs (void)
5728 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5730 if (tm_clone_hash
== NULL
)
5733 /* We need a determenistic order for the .tm_clone_table, otherwise
5734 we will get bootstrap comparison failures, so dump the hash table
5735 to a vector, sort it, and dump the vector. */
5737 /* Dump the hashtable to a vector. */
5738 htab_traverse_noresize (tm_clone_hash
, dump_tm_clone_to_vec
,
5739 (void *) &tm_alias_pairs
);
5741 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5744 dump_tm_clone_pairs (tm_alias_pairs
);
5746 htab_delete (tm_clone_hash
);
5747 tm_clone_hash
= NULL
;
5748 tm_alias_pairs
.release ();
5752 /* Emit an assembler directive to set symbol for DECL visibility to
5753 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5756 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5757 int vis ATTRIBUTE_UNUSED
)
5759 #ifdef HAVE_GAS_HIDDEN
5760 static const char * const visibility_types
[] = {
5761 NULL
, "protected", "hidden", "internal"
5764 const char *name
, *type
;
5766 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5767 type
= visibility_types
[vis
];
5769 fprintf (asm_out_file
, "\t.%s\t", type
);
5770 assemble_name (asm_out_file
, name
);
5771 fprintf (asm_out_file
, "\n");
5773 warning (OPT_Wattributes
, "visibility attribute not supported "
5774 "in this configuration; ignored");
5778 /* A helper function to call assemble_visibility when needed for a decl. */
5781 maybe_assemble_visibility (tree decl
)
5783 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5785 if (vis
!= VISIBILITY_DEFAULT
)
5787 targetm
.asm_out
.assemble_visibility (decl
, vis
);
5794 /* Returns 1 if the target configuration supports defining public symbols
5795 so that one of them will be chosen at link time instead of generating a
5796 multiply-defined symbol error, whether through the use of weak symbols or
5797 a target-specific mechanism for having duplicates discarded. */
5800 supports_one_only (void)
5802 if (SUPPORTS_ONE_ONLY
)
5804 return TARGET_SUPPORTS_WEAK
;
5807 /* Set up DECL as a public symbol that can be defined in multiple
5808 translation units without generating a linker error. */
5811 make_decl_one_only (tree decl
, tree comdat_group
)
5813 gcc_assert (TREE_CODE (decl
) == VAR_DECL
5814 || TREE_CODE (decl
) == FUNCTION_DECL
);
5816 TREE_PUBLIC (decl
) = 1;
5818 if (SUPPORTS_ONE_ONLY
)
5820 #ifdef MAKE_DECL_ONE_ONLY
5821 MAKE_DECL_ONE_ONLY (decl
);
5823 DECL_COMDAT_GROUP (decl
) = comdat_group
;
5825 else if (TREE_CODE (decl
) == VAR_DECL
5826 && (DECL_INITIAL (decl
) == 0 || DECL_INITIAL (decl
) == error_mark_node
))
5827 DECL_COMMON (decl
) = 1;
5830 gcc_assert (TARGET_SUPPORTS_WEAK
);
5831 DECL_WEAK (decl
) = 1;
5836 init_varasm_once (void)
5838 section_htab
= htab_create_ggc (31, section_entry_hash
,
5839 section_entry_eq
, NULL
);
5840 object_block_htab
= htab_create_ggc (31, object_block_entry_hash
,
5841 object_block_entry_eq
, NULL
);
5842 const_desc_htab
= htab_create_ggc (1009, const_desc_hash
,
5843 const_desc_eq
, NULL
);
5845 const_alias_set
= new_alias_set ();
5846 shared_constant_pool
= create_constant_pool ();
5848 #ifdef TEXT_SECTION_ASM_OP
5849 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
5850 TEXT_SECTION_ASM_OP
);
5853 #ifdef DATA_SECTION_ASM_OP
5854 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5855 DATA_SECTION_ASM_OP
);
5858 #ifdef SDATA_SECTION_ASM_OP
5859 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
5860 SDATA_SECTION_ASM_OP
);
5863 #ifdef READONLY_DATA_SECTION_ASM_OP
5864 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
5865 READONLY_DATA_SECTION_ASM_OP
);
5868 #ifdef CTORS_SECTION_ASM_OP
5869 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
5870 CTORS_SECTION_ASM_OP
);
5873 #ifdef DTORS_SECTION_ASM_OP
5874 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
5875 DTORS_SECTION_ASM_OP
);
5878 #ifdef BSS_SECTION_ASM_OP
5879 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5880 output_section_asm_op
,
5881 BSS_SECTION_ASM_OP
);
5884 #ifdef SBSS_SECTION_ASM_OP
5885 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
5886 output_section_asm_op
,
5887 SBSS_SECTION_ASM_OP
);
5890 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5891 | SECTION_COMMON
, emit_tls_common
);
5892 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5893 | SECTION_COMMON
, emit_local
);
5894 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
5895 | SECTION_COMMON
, emit_common
);
5897 #if defined ASM_OUTPUT_ALIGNED_BSS
5898 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
5902 targetm
.asm_out
.init_sections ();
5904 if (readonly_data_section
== NULL
)
5905 readonly_data_section
= text_section
;
5909 decl_default_tls_model (const_tree decl
)
5911 enum tls_model kind
;
5914 is_local
= targetm
.binds_local_p (decl
);
5918 kind
= TLS_MODEL_LOCAL_EXEC
;
5920 kind
= TLS_MODEL_INITIAL_EXEC
;
5923 /* Local dynamic is inefficient when we're not combining the
5924 parts of the address. */
5925 else if (optimize
&& is_local
)
5926 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
5928 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
5929 if (kind
< flag_tls_default
)
5930 kind
= flag_tls_default
;
5935 /* Select a set of attributes for section NAME based on the properties
5936 of DECL and whether or not RELOC indicates that DECL's initializer
5937 might contain runtime relocations.
5939 We make the section read-only and executable for a function decl,
5940 read-only for a const data decl, and writable for a non-const data decl. */
5943 default_section_type_flags (tree decl
, const char *name
, int reloc
)
5947 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
5948 flags
= SECTION_CODE
;
5951 enum section_category category
5952 = categorize_decl_for_section (decl
, reloc
);
5953 if (decl_readonly_section_1 (category
))
5955 else if (category
== SECCAT_DATA_REL_RO
5956 || category
== SECCAT_DATA_REL_RO_LOCAL
)
5957 flags
= SECTION_WRITE
| SECTION_RELRO
;
5959 flags
= SECTION_WRITE
;
5963 flags
= SECTION_WRITE
;
5964 if (strcmp (name
, ".data.rel.ro") == 0
5965 || strcmp (name
, ".data.rel.ro.local") == 0)
5966 flags
|= SECTION_RELRO
;
5969 if (decl
&& DECL_ONE_ONLY (decl
))
5970 flags
|= SECTION_LINKONCE
;
5972 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
5973 flags
|= SECTION_TLS
| SECTION_WRITE
;
5975 if (strcmp (name
, ".bss") == 0
5976 || strncmp (name
, ".bss.", 5) == 0
5977 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
5978 || strcmp (name
, ".sbss") == 0
5979 || strncmp (name
, ".sbss.", 6) == 0
5980 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
5981 flags
|= SECTION_BSS
;
5983 if (strcmp (name
, ".tdata") == 0
5984 || strncmp (name
, ".tdata.", 7) == 0
5985 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
5986 flags
|= SECTION_TLS
;
5988 if (strcmp (name
, ".tbss") == 0
5989 || strncmp (name
, ".tbss.", 6) == 0
5990 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
5991 flags
|= SECTION_TLS
| SECTION_BSS
;
5993 /* These three sections have special ELF types. They are neither
5994 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
5995 want to print a section type (@progbits or @nobits). If someone
5996 is silly enough to emit code or TLS variables to one of these
5997 sections, then don't handle them specially. */
5998 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
5999 && (strcmp (name
, ".init_array") == 0
6000 || strcmp (name
, ".fini_array") == 0
6001 || strcmp (name
, ".preinit_array") == 0))
6002 flags
|= SECTION_NOTYPE
;
6007 /* Return true if the target supports some form of global BSS,
6008 either through bss_noswitch_section, or by selecting a BSS
6009 section in TARGET_ASM_SELECT_SECTION. */
6012 have_global_bss_p (void)
6014 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6017 /* Output assembly to switch to section NAME with attribute FLAGS.
6018 Four variants for common object file formats. */
6021 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6022 unsigned int flags ATTRIBUTE_UNUSED
,
6023 tree decl ATTRIBUTE_UNUSED
)
6025 /* Some object formats don't support named sections at all. The
6026 front-end should already have flagged this as an error. */
6030 #ifndef TLS_SECTION_ASM_FLAG
6031 #define TLS_SECTION_ASM_FLAG 'T'
6035 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6036 tree decl ATTRIBUTE_UNUSED
)
6038 char flagchars
[10], *f
= flagchars
;
6040 /* If we have already declared this section, we can use an
6041 abbreviated form to switch back to it -- unless this section is
6042 part of a COMDAT groups, in which case GAS requires the full
6043 declaration every time. */
6044 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6045 && (flags
& SECTION_DECLARED
))
6047 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6051 if (!(flags
& SECTION_DEBUG
))
6053 if (flags
& SECTION_EXCLUDE
)
6055 if (flags
& SECTION_WRITE
)
6057 if (flags
& SECTION_CODE
)
6059 if (flags
& SECTION_SMALL
)
6061 if (flags
& SECTION_MERGE
)
6063 if (flags
& SECTION_STRINGS
)
6065 if (flags
& SECTION_TLS
)
6066 *f
++ = TLS_SECTION_ASM_FLAG
;
6067 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6071 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6073 if (!(flags
& SECTION_NOTYPE
))
6078 if (flags
& SECTION_BSS
)
6084 /* On platforms that use "@" as the assembly comment character,
6086 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6088 fprintf (asm_out_file
, format
, type
);
6090 if (flags
& SECTION_ENTSIZE
)
6091 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6092 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6094 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6095 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6097 fprintf (asm_out_file
, ",%s,comdat",
6098 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6102 putc ('\n', asm_out_file
);
6106 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6107 tree decl ATTRIBUTE_UNUSED
)
6109 char flagchars
[8], *f
= flagchars
;
6111 if (flags
& SECTION_WRITE
)
6113 if (flags
& SECTION_CODE
)
6117 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6121 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6124 default_coff_asm_named_section (name
, flags
, decl
);
6126 if (flags
& SECTION_LINKONCE
)
6128 /* Functions may have been compiled at various levels of
6129 optimization so we can't use `same_size' here.
6130 Instead, have the linker pick one. */
6131 fprintf (asm_out_file
, "\t.linkonce %s\n",
6132 (flags
& SECTION_CODE
? "discard" : "same_size"));
6136 /* The lame default section selector. */
6139 default_select_section (tree decl
, int reloc
,
6140 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6144 if (decl_readonly_section (decl
, reloc
))
6145 return readonly_data_section
;
6147 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6149 if (! ((flag_pic
&& reloc
)
6150 || !TREE_READONLY (decl
)
6151 || TREE_SIDE_EFFECTS (decl
)
6152 || !TREE_CONSTANT (decl
)))
6153 return readonly_data_section
;
6155 else if (TREE_CODE (decl
) == STRING_CST
)
6156 return readonly_data_section
;
6157 else if (! (flag_pic
&& reloc
))
6158 return readonly_data_section
;
6160 return data_section
;
6163 enum section_category
6164 categorize_decl_for_section (const_tree decl
, int reloc
)
6166 enum section_category ret
;
6168 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6170 else if (TREE_CODE (decl
) == STRING_CST
)
6173 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6174 /* or !flag_merge_constants */
6175 return SECCAT_RODATA
;
6177 return SECCAT_RODATA_MERGE_STR
;
6179 else if (TREE_CODE (decl
) == VAR_DECL
)
6181 if (bss_initializer_p (decl
))
6183 else if (! TREE_READONLY (decl
)
6184 || TREE_SIDE_EFFECTS (decl
)
6185 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6187 /* Here the reloc_rw_mask is not testing whether the section should
6188 be read-only or not, but whether the dynamic link will have to
6189 do something. If so, we wish to segregate the data in order to
6190 minimize cache misses inside the dynamic linker. */
6191 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6192 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6196 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6197 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6198 else if (reloc
|| flag_merge_constants
< 2 || flag_mudflap
6199 || (flag_asan
&& asan_protect_global (CONST_CAST_TREE (decl
))))
6200 /* C and C++ don't allow different variables to share the same
6201 location. -fmerge-all-constants allows even that (at the
6202 expense of not conforming). */
6203 ret
= SECCAT_RODATA
;
6204 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6205 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6207 ret
= SECCAT_RODATA_MERGE_CONST
;
6209 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6211 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6212 || TREE_SIDE_EFFECTS (decl
)
6213 || ! TREE_CONSTANT (decl
))
6216 ret
= SECCAT_RODATA
;
6219 ret
= SECCAT_RODATA
;
6221 /* There are no read-only thread-local sections. */
6222 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6224 /* Note that this would be *just* SECCAT_BSS, except that there's
6225 no concept of a read-only thread-local-data section. */
6226 if (ret
== SECCAT_BSS
6227 || (flag_zero_initialized_in_bss
6228 && initializer_zerop (DECL_INITIAL (decl
))))
6234 /* If the target uses small data sections, select it. */
6235 else if (targetm
.in_small_data_p (decl
))
6237 if (ret
== SECCAT_BSS
)
6239 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6240 ret
= SECCAT_SRODATA
;
6249 decl_readonly_section_1 (enum section_category category
)
6254 case SECCAT_RODATA_MERGE_STR
:
6255 case SECCAT_RODATA_MERGE_STR_INIT
:
6256 case SECCAT_RODATA_MERGE_CONST
:
6257 case SECCAT_SRODATA
:
6265 decl_readonly_section (const_tree decl
, int reloc
)
6267 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6270 /* Select a section based on the above categorization. */
6273 default_elf_select_section (tree decl
, int reloc
,
6274 unsigned HOST_WIDE_INT align
)
6277 switch (categorize_decl_for_section (decl
, reloc
))
6280 /* We're not supposed to be called on FUNCTION_DECLs. */
6283 return readonly_data_section
;
6284 case SECCAT_RODATA_MERGE_STR
:
6285 return mergeable_string_section (decl
, align
, 0);
6286 case SECCAT_RODATA_MERGE_STR_INIT
:
6287 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6288 case SECCAT_RODATA_MERGE_CONST
:
6289 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6290 case SECCAT_SRODATA
:
6294 return data_section
;
6295 case SECCAT_DATA_REL
:
6296 sname
= ".data.rel";
6298 case SECCAT_DATA_REL_LOCAL
:
6299 sname
= ".data.rel.local";
6301 case SECCAT_DATA_REL_RO
:
6302 sname
= ".data.rel.ro";
6304 case SECCAT_DATA_REL_RO_LOCAL
:
6305 sname
= ".data.rel.ro.local";
6330 return get_named_section (decl
, sname
, reloc
);
6333 /* Construct a unique section name based on the decl name and the
6334 categorization performed above. */
6337 default_unique_section (tree decl
, int reloc
)
6339 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6340 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6341 const char *prefix
, *name
, *linkonce
;
6344 switch (categorize_decl_for_section (decl
, reloc
))
6347 prefix
= one_only
? ".t" : ".text";
6350 case SECCAT_RODATA_MERGE_STR
:
6351 case SECCAT_RODATA_MERGE_STR_INIT
:
6352 case SECCAT_RODATA_MERGE_CONST
:
6353 prefix
= one_only
? ".r" : ".rodata";
6355 case SECCAT_SRODATA
:
6356 prefix
= one_only
? ".s2" : ".sdata2";
6359 prefix
= one_only
? ".d" : ".data";
6361 case SECCAT_DATA_REL
:
6362 prefix
= one_only
? ".d.rel" : ".data.rel";
6364 case SECCAT_DATA_REL_LOCAL
:
6365 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6367 case SECCAT_DATA_REL_RO
:
6368 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6370 case SECCAT_DATA_REL_RO_LOCAL
:
6371 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6374 prefix
= one_only
? ".s" : ".sdata";
6377 prefix
= one_only
? ".b" : ".bss";
6380 prefix
= one_only
? ".sb" : ".sbss";
6383 prefix
= one_only
? ".td" : ".tdata";
6386 prefix
= one_only
? ".tb" : ".tbss";
6392 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
6393 name
= targetm
.strip_name_encoding (name
);
6395 /* If we're using one_only, then there needs to be a .gnu.linkonce
6396 prefix to the section name. */
6397 linkonce
= one_only
? ".gnu.linkonce" : "";
6399 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6401 DECL_SECTION_NAME (decl
) = build_string (strlen (string
), string
);
6404 /* Like compute_reloc_for_constant, except for an RTX. The return value
6405 is a mask for which bit 1 indicates a global relocation, and bit 0
6406 indicates a local relocation. */
6409 compute_reloc_for_rtx_1 (rtx
*xp
, void *data
)
6411 int *preloc
= (int *) data
;
6414 switch (GET_CODE (x
))
6417 *preloc
|= SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6430 compute_reloc_for_rtx (rtx x
)
6434 switch (GET_CODE (x
))
6440 for_each_rtx (&x
, compute_reloc_for_rtx_1
, &reloc
);
6449 default_select_rtx_section (enum machine_mode mode ATTRIBUTE_UNUSED
,
6451 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6453 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6454 return data_section
;
6456 return readonly_data_section
;
6460 default_elf_select_rtx_section (enum machine_mode mode
, rtx x
,
6461 unsigned HOST_WIDE_INT align
)
6463 int reloc
= compute_reloc_for_rtx (x
);
6465 /* ??? Handle small data here somehow. */
6467 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6470 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6472 return get_named_section (NULL
, ".data.rel.ro", 3);
6475 return mergeable_constant_section (mode
, align
, 0);
6478 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6481 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6486 /* Careful not to prod global register variables. */
6489 symbol
= XEXP (rtl
, 0);
6490 if (GET_CODE (symbol
) != SYMBOL_REF
)
6493 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6494 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6495 flags
|= SYMBOL_FLAG_FUNCTION
;
6496 if (targetm
.binds_local_p (decl
))
6497 flags
|= SYMBOL_FLAG_LOCAL
;
6498 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6499 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6500 else if (targetm
.in_small_data_p (decl
))
6501 flags
|= SYMBOL_FLAG_SMALL
;
6502 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6503 being PUBLIC, the thing *must* be defined in this translation unit.
6504 Prevent this buglet from being propagated into rtl code as well. */
6505 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6506 flags
|= SYMBOL_FLAG_EXTERNAL
;
6508 SYMBOL_REF_FLAGS (symbol
) = flags
;
6511 /* By default, we do nothing for encode_section_info, so we need not
6512 do anything but discard the '*' marker. */
6515 default_strip_name_encoding (const char *str
)
6517 return str
+ (*str
== '*');
6520 #ifdef ASM_OUTPUT_DEF
6521 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6522 anchor relative to ".", the current section position. */
6525 default_asm_output_anchor (rtx symbol
)
6529 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6530 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6531 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6535 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6538 default_use_anchors_for_symbol_p (const_rtx symbol
)
6543 /* Don't use anchors for mergeable sections. The linker might move
6544 the objects around. */
6545 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6546 if (sect
->common
.flags
& SECTION_MERGE
)
6549 /* Don't use anchors for small data sections. The small data register
6550 acts as an anchor for such sections. */
6551 if (sect
->common
.flags
& SECTION_SMALL
)
6554 decl
= SYMBOL_REF_DECL (symbol
);
6555 if (decl
&& DECL_P (decl
))
6557 /* Don't use section anchors for decls that might be defined by
6559 if (!targetm
.binds_local_p (decl
))
6562 /* Don't use section anchors for decls that will be placed in a
6563 small data section. */
6564 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6565 one above. The problem is that we only use SECTION_SMALL for
6566 sections that should be marked as small in the section directive. */
6567 if (targetm
.in_small_data_p (decl
))
6573 /* Return true when RESOLUTION indicate that symbol will be bound to the
6574 definition provided by current .o file. */
6577 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6579 return (resolution
== LDPR_PREVAILING_DEF
6580 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6581 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6584 /* Return true when RESOLUTION indicate that symbol will be bound locally
6585 within current executable or DSO. */
6588 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6590 return (resolution
== LDPR_PREVAILING_DEF
6591 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6592 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6593 || resolution
== LDPR_PREEMPTED_REG
6594 || resolution
== LDPR_PREEMPTED_IR
6595 || resolution
== LDPR_RESOLVED_IR
6596 || resolution
== LDPR_RESOLVED_EXEC
);
6599 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6600 wrt cross-module name binding. */
6603 default_binds_local_p (const_tree exp
)
6605 return default_binds_local_p_1 (exp
, flag_shlib
);
6609 default_binds_local_p_1 (const_tree exp
, int shlib
)
6612 bool resolved_locally
= false;
6613 bool resolved_to_local_def
= false;
6615 /* With resolution file in hands, take look into resolutions.
6616 We can't just return true for resolved_locally symbols,
6617 because dynamic linking might overwrite symbols
6618 in shared libraries. */
6619 if (TREE_CODE (exp
) == VAR_DECL
&& TREE_PUBLIC (exp
)
6620 && (TREE_STATIC (exp
) || DECL_EXTERNAL (exp
)))
6622 struct varpool_node
*vnode
= varpool_get_node (exp
);
6623 if (vnode
&& resolution_local_p (vnode
->symbol
.resolution
))
6624 resolved_locally
= true;
6626 && resolution_to_local_definition_p (vnode
->symbol
.resolution
))
6627 resolved_to_local_def
= true;
6629 else if (TREE_CODE (exp
) == FUNCTION_DECL
&& TREE_PUBLIC (exp
))
6631 struct cgraph_node
*node
= cgraph_get_node (exp
);
6633 && resolution_local_p (node
->symbol
.resolution
))
6634 resolved_locally
= true;
6636 && resolution_to_local_definition_p (node
->symbol
.resolution
))
6637 resolved_to_local_def
= true;
6640 /* A non-decl is an entry in the constant pool. */
6643 /* Weakrefs may not bind locally, even though the weakref itself is always
6644 static and therefore local. Similarly, the resolver for ifunc functions
6645 might resolve to a non-local function.
6646 FIXME: We can resolve the weakref case more curefuly by looking at the
6648 else if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6649 || (TREE_CODE (exp
) == FUNCTION_DECL
6650 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6652 /* Static variables are always local. */
6653 else if (! TREE_PUBLIC (exp
))
6655 /* A variable is local if the user has said explicitly that it will
6657 else if ((DECL_VISIBILITY_SPECIFIED (exp
)
6658 || resolved_to_local_def
)
6659 && DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6661 /* Variables defined outside this object might not be local. */
6662 else if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6664 /* If defined in this object and visibility is not default, must be
6666 else if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
)
6668 /* Default visibility weak data can be overridden by a strong symbol
6669 in another module and so are not local. */
6670 else if (DECL_WEAK (exp
)
6671 && !resolved_locally
)
6673 /* If PIC, then assume that any global name can be overridden by
6674 symbols resolved from other modules. */
6677 /* Uninitialized COMMON variable may be unified with symbols
6678 resolved from other modules. */
6679 else if (DECL_COMMON (exp
)
6680 && !resolved_locally
6681 && (DECL_INITIAL (exp
) == NULL
6682 || DECL_INITIAL (exp
) == error_mark_node
))
6684 /* Otherwise we're left with initialized (or non-common) global data
6685 which is of necessity defined locally. */
6692 /* Return true when references to DECL must bind to current definition in
6695 The condition is usually equivalent to whether the function binds to the
6696 current module (shared library or executable), that is to binds_local_p.
6697 We use this fact to avoid need for another target hook and implement
6698 the logic using binds_local_p and just special cases where
6699 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6700 the weak definitions (that can be overwritten at linktime by other
6701 definition from different object file) and when resolution info is available
6702 we simply use the knowledge passed to us by linker plugin. */
6704 decl_binds_to_current_def_p (tree decl
)
6706 gcc_assert (DECL_P (decl
));
6707 if (!TREE_PUBLIC (decl
))
6709 if (!targetm
.binds_local_p (decl
))
6711 /* When resolution is available, just use it. */
6712 if (TREE_CODE (decl
) == VAR_DECL
6713 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
)))
6715 struct varpool_node
*vnode
= varpool_get_node (decl
);
6717 && vnode
->symbol
.resolution
!= LDPR_UNKNOWN
)
6718 return resolution_to_local_definition_p (vnode
->symbol
.resolution
);
6720 else if (TREE_CODE (decl
) == FUNCTION_DECL
)
6722 struct cgraph_node
*node
= cgraph_get_node (decl
);
6724 && node
->symbol
.resolution
!= LDPR_UNKNOWN
)
6725 return resolution_to_local_definition_p (node
->symbol
.resolution
);
6727 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6728 binds locally but still can be overwritten).
6729 This rely on fact that binds_local_p behave as decl_replaceable_p
6730 for all other declaration types. */
6731 return !DECL_WEAK (decl
);
6734 /* A replaceable function or variable is one which may be replaced
6735 at link-time with an entirely different definition, provided that the
6736 replacement has the same type. For example, functions declared
6737 with __attribute__((weak)) on most systems are replaceable.
6739 COMDAT functions are not replaceable, since all definitions of the
6740 function must be equivalent. It is important that COMDAT functions
6741 not be treated as replaceable so that use of C++ template
6742 instantiations is not penalized. */
6745 decl_replaceable_p (tree decl
)
6747 gcc_assert (DECL_P (decl
));
6748 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6750 return !decl_binds_to_current_def_p (decl
);
6753 /* Default function to output code that will globalize a label. A
6754 target must define GLOBAL_ASM_OP or provide its own function to
6755 globalize a label. */
6756 #ifdef GLOBAL_ASM_OP
6758 default_globalize_label (FILE * stream
, const char *name
)
6760 fputs (GLOBAL_ASM_OP
, stream
);
6761 assemble_name (stream
, name
);
6762 putc ('\n', stream
);
6764 #endif /* GLOBAL_ASM_OP */
6766 /* Default function to output code that will globalize a declaration. */
6768 default_globalize_decl_name (FILE * stream
, tree decl
)
6770 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
6771 targetm
.asm_out
.globalize_label (stream
, name
);
6774 /* Default function to output a label for unwind information. The
6775 default is to do nothing. A target that needs nonlocal labels for
6776 unwind information must provide its own function to do this. */
6778 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
6779 tree decl ATTRIBUTE_UNUSED
,
6780 int for_eh ATTRIBUTE_UNUSED
,
6781 int empty ATTRIBUTE_UNUSED
)
6785 /* Default function to output a label to divide up the exception table.
6786 The default is to do nothing. A target that needs/wants to divide
6787 up the table must provide it's own function to do this. */
6789 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
6793 /* This is how to output an internal numbered label where PREFIX is
6794 the class of label and LABELNO is the number within the class. */
6797 default_generate_internal_label (char *buf
, const char *prefix
,
6798 unsigned long labelno
)
6800 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
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_internal_label (FILE *stream
, const char *prefix
,
6808 unsigned long labelno
)
6810 char *const buf
= (char *) alloca (40 + strlen (prefix
));
6811 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
6812 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
6816 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
6819 default_asm_declare_constant_name (FILE *file
, const char *name
,
6820 const_tree exp ATTRIBUTE_UNUSED
,
6821 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
6823 assemble_label (file
, name
);
6826 /* This is the default behavior at the beginning of a file. It's
6827 controlled by two other target-hook toggles. */
6829 default_file_start (void)
6831 if (targetm
.asm_file_start_app_off
6832 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
6833 fputs (ASM_APP_OFF
, asm_out_file
);
6835 if (targetm
.asm_file_start_file_directive
)
6836 output_file_directive (asm_out_file
, main_input_filename
);
6839 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
6840 which emits a special section directive used to indicate whether or
6841 not this object file needs an executable stack. This is primarily
6842 a GNU extension to ELF but could be used on other targets. */
6844 int trampolines_created
;
6847 file_end_indicate_exec_stack (void)
6849 unsigned int flags
= SECTION_DEBUG
;
6850 if (trampolines_created
)
6851 flags
|= SECTION_CODE
;
6853 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
6856 /* Emit a special section directive to indicate that this object file
6857 was compiled with -fsplit-stack. This is used to let the linker
6858 detect calls between split-stack code and non-split-stack code, so
6859 that it can modify the split-stack code to allocate a sufficiently
6860 large stack. We emit another special section if there are any
6861 functions in this file which have the no_split_stack attribute, to
6862 prevent the linker from warning about being unable to convert the
6863 functions if they call non-split-stack code. */
6866 file_end_indicate_split_stack (void)
6868 if (flag_split_stack
)
6870 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
6872 if (saw_no_split_stack
)
6873 switch_to_section (get_section (".note.GNU-no-split-stack",
6874 SECTION_DEBUG
, NULL
));
6878 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
6879 a get_unnamed_section callback. */
6882 output_section_asm_op (const void *directive
)
6884 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
6887 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
6888 the current section is NEW_SECTION. */
6891 switch_to_section (section
*new_section
)
6893 if (in_section
== new_section
)
6896 if (new_section
->common
.flags
& SECTION_FORGET
)
6899 in_section
= new_section
;
6901 switch (SECTION_STYLE (new_section
))
6904 targetm
.asm_out
.named_section (new_section
->named
.name
,
6905 new_section
->named
.common
.flags
,
6906 new_section
->named
.decl
);
6909 case SECTION_UNNAMED
:
6910 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
6913 case SECTION_NOSWITCH
:
6918 new_section
->common
.flags
|= SECTION_DECLARED
;
6921 /* If block symbol SYMBOL has not yet been assigned an offset, place
6922 it at the end of its block. */
6925 place_block_symbol (rtx symbol
)
6927 unsigned HOST_WIDE_INT size
, mask
, offset
;
6928 struct constant_descriptor_rtx
*desc
;
6929 unsigned int alignment
;
6930 struct object_block
*block
;
6933 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
6934 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
6937 /* Work out the symbol's size and alignment. */
6938 if (CONSTANT_POOL_ADDRESS_P (symbol
))
6940 desc
= SYMBOL_REF_CONSTANT (symbol
);
6941 alignment
= desc
->align
;
6942 size
= GET_MODE_SIZE (desc
->mode
);
6944 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
6946 decl
= SYMBOL_REF_DECL (symbol
);
6947 alignment
= DECL_ALIGN (decl
);
6948 size
= get_constant_size (DECL_INITIAL (decl
));
6952 decl
= SYMBOL_REF_DECL (symbol
);
6953 alignment
= DECL_ALIGN (decl
);
6954 size
= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
6955 if (flag_asan
&& asan_protect_global (decl
))
6956 size
+= asan_red_zone_size (size
);
6959 /* Calculate the object's offset from the start of the block. */
6960 block
= SYMBOL_REF_BLOCK (symbol
);
6961 mask
= alignment
/ BITS_PER_UNIT
- 1;
6962 offset
= (block
->size
+ mask
) & ~mask
;
6963 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
6965 /* Record the block's new alignment and size. */
6966 block
->alignment
= MAX (block
->alignment
, alignment
);
6967 block
->size
= offset
+ size
;
6969 vec_safe_push (block
->objects
, symbol
);
6972 /* Return the anchor that should be used to address byte offset OFFSET
6973 from the first object in BLOCK. MODEL is the TLS model used
6977 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
6978 enum tls_model model
)
6981 unsigned int begin
, middle
, end
;
6982 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
6985 /* Work out the anchor's offset. Use an offset of 0 for the first
6986 anchor so that we don't pessimize the case where we take the address
6987 of a variable at the beginning of the block. This is particularly
6988 useful when a block has only one variable assigned to it.
6990 We try to place anchors RANGE bytes apart, so there can then be
6991 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
6992 a ptr_mode offset. With some target settings, the lowest such
6993 anchor might be out of range for the lowest ptr_mode offset;
6994 likewise the highest anchor for the highest offset. Use anchors
6995 at the extreme ends of the ptr_mode range in such cases.
6997 All arithmetic uses unsigned integers in order to avoid
6999 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7000 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7001 range
= max_offset
- min_offset
+ 1;
7006 bias
= 1 << (GET_MODE_BITSIZE (ptr_mode
) - 1);
7009 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7010 delta
-= delta
% range
;
7013 offset
= (HOST_WIDE_INT
) (-delta
);
7017 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7018 delta
-= delta
% range
;
7019 if (delta
> bias
- 1)
7021 offset
= (HOST_WIDE_INT
) delta
;
7025 /* Do a binary search to see if there's already an anchor we can use.
7026 Set BEGIN to the new anchor's index if not. */
7028 end
= vec_safe_length (block
->anchors
);
7029 while (begin
!= end
)
7031 middle
= (end
+ begin
) / 2;
7032 anchor
= (*block
->anchors
)[middle
];
7033 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7035 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7037 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7039 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7045 /* Create a new anchor with a unique label. */
7046 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7047 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7048 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7049 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7051 /* Insert it at index BEGIN. */
7052 vec_safe_insert (block
->anchors
, begin
, anchor
);
7056 /* Output the objects in BLOCK. */
7059 output_object_block (struct object_block
*block
)
7061 struct constant_descriptor_rtx
*desc
;
7063 HOST_WIDE_INT offset
;
7067 if (!block
->objects
)
7070 /* Switch to the section and make sure that the first byte is
7071 suitably aligned. */
7072 switch_to_section (block
->sect
);
7073 assemble_align (block
->alignment
);
7075 /* Define the values of all anchors relative to the current section
7077 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7078 targetm
.asm_out
.output_anchor (symbol
);
7080 /* Output the objects themselves. */
7082 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7084 /* Move to the object's offset, padding with zeros if necessary. */
7085 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7086 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7087 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7089 desc
= SYMBOL_REF_CONSTANT (symbol
);
7090 output_constant_pool_1 (desc
, 1);
7091 offset
+= GET_MODE_SIZE (desc
->mode
);
7093 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7095 decl
= SYMBOL_REF_DECL (symbol
);
7096 assemble_constant_contents (DECL_INITIAL (decl
), XSTR (symbol
, 0),
7098 offset
+= get_constant_size (DECL_INITIAL (decl
));
7102 decl
= SYMBOL_REF_DECL (symbol
);
7103 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7104 offset
+= tree_low_cst (DECL_SIZE_UNIT (decl
), 1);
7109 /* A htab_traverse callback used to call output_object_block for
7110 each member of object_block_htab. */
7113 output_object_block_htab (void **slot
, void *data ATTRIBUTE_UNUSED
)
7115 output_object_block ((struct object_block
*) (*slot
));
7119 /* Output the definitions of all object_blocks. */
7122 output_object_blocks (void)
7124 htab_traverse (object_block_htab
, output_object_block_htab
, NULL
);
7127 /* This function provides a possible implementation of the
7128 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7129 by -frecord-gcc-switches it creates a new mergeable, string section in the
7130 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7131 contains the switches in ASCII format.
7133 FIXME: This code does not correctly handle double quote characters
7134 that appear inside strings, (it strips them rather than preserving them).
7135 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7136 characters - instead it treats them as sub-string separators. Since
7137 we want to emit NUL strings terminators into the object file we have to use
7141 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7145 case SWITCH_TYPE_PASSED
:
7146 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7147 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7150 case SWITCH_TYPE_DESCRIPTIVE
:
7153 /* Distinguish between invocations where name is NULL. */
7154 static bool started
= false;
7160 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7164 | (SECTION_ENTSIZE
& 1),
7166 switch_to_section (sec
);
7175 /* The return value is currently ignored by the caller, but must be 0.
7176 For -fverbose-asm the return value would be the number of characters
7177 emitted into the assembler file. */
7181 /* Emit text to declare externally defined symbols. It is needed to
7182 properly support non-default visibility. */
7184 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7186 const char *name ATTRIBUTE_UNUSED
)
7188 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7189 set in order to avoid putting out names that are never really
7191 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7192 && targetm
.binds_local_p (decl
))
7193 maybe_assemble_visibility (decl
);
7196 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7199 default_asm_output_source_filename (FILE *file
, const char *name
)
7201 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7202 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7204 fprintf (file
, "\t.file\t");
7205 output_quoted_string (file
, name
);
7210 /* Output a file name in the form wanted by System V. */
7213 output_file_directive (FILE *asm_file
, const char *input_name
)
7218 if (input_name
== NULL
)
7219 input_name
= "<stdin>";
7221 input_name
= remap_debug_filename (input_name
);
7223 len
= strlen (input_name
);
7224 na
= input_name
+ len
;
7226 /* NA gets INPUT_NAME sans directory names. */
7227 while (na
> input_name
)
7229 if (IS_DIR_SEPARATOR (na
[-1]))
7234 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7237 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7240 make_debug_expr_from_rtl (const_rtx exp
)
7242 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7243 enum machine_mode mode
= GET_MODE (exp
);
7246 DECL_ARTIFICIAL (ddecl
) = 1;
7247 if (REG_P (exp
) && REG_EXPR (exp
))
7248 type
= TREE_TYPE (REG_EXPR (exp
));
7249 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7250 type
= TREE_TYPE (MEM_EXPR (exp
));
7253 if (type
&& TYPE_MODE (type
) == mode
)
7254 TREE_TYPE (ddecl
) = type
;
7256 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7257 DECL_MODE (ddecl
) = mode
;
7258 dval
= gen_rtx_DEBUG_EXPR (mode
);
7259 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7260 SET_DECL_RTL (ddecl
, dval
);
7264 #ifdef ELF_ASCII_ESCAPES
7265 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7268 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7273 fputs (STRING_ASM_OP
, f
);
7278 escape
= ELF_ASCII_ESCAPES
[c
];
7285 /* TODO: Print in hex with fast function, important for -flto. */
7286 fprintf (f
, "\\%03o", c
);
7299 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7302 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7304 const char *limit
= s
+ len
;
7305 const char *last_null
= NULL
;
7306 unsigned bytes_in_chunk
= 0;
7310 for (; s
< limit
; s
++)
7314 if (bytes_in_chunk
>= 60)
7323 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7330 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7332 if (bytes_in_chunk
> 0)
7339 default_elf_asm_output_limited_string (f
, s
);
7344 if (bytes_in_chunk
== 0)
7345 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7348 escape
= ELF_ASCII_ESCAPES
[c
];
7356 /* TODO: Print in hex with fast function, important for -flto. */
7357 fprintf (f
, "\\%03o", c
);
7358 bytes_in_chunk
+= 4;
7363 bytes_in_chunk
+= 2;
7370 if (bytes_in_chunk
> 0)
7378 static GTY(()) section
*elf_init_array_section
;
7379 static GTY(()) section
*elf_fini_array_section
;
7382 get_elf_initfini_array_priority_section (int priority
,
7386 if (priority
!= DEFAULT_INIT_PRIORITY
)
7389 sprintf (buf
, "%s.%.5u",
7390 constructor_p
? ".init_array" : ".fini_array",
7392 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7398 if (elf_init_array_section
== NULL
)
7399 elf_init_array_section
7400 = get_section (".init_array",
7401 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7402 sec
= elf_init_array_section
;
7406 if (elf_fini_array_section
== NULL
)
7407 elf_fini_array_section
7408 = get_section (".fini_array",
7409 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7410 sec
= elf_fini_array_section
;
7416 /* Use .init_array section for constructors. */
7419 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7421 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7423 assemble_addr_to_section (symbol
, sec
);
7426 /* Use .fini_array section for destructors. */
7429 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7431 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7433 assemble_addr_to_section (symbol
, sec
);
7436 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7438 This is a bit of a cheat. The real default is a no-op, but this
7439 hook is the default for all targets with a .ident directive. */
7442 default_asm_output_ident_directive (const char *ident_str
)
7444 const char *ident_asm_op
= "\t.ident\t";
7446 /* If we are still in the front end, do not write out the string
7447 to asm_out_file. Instead, add a fake top-level asm statement.
7448 This allows the front ends to use this hook without actually
7449 writing to asm_out_file, to handle #ident or Pragma Ident. */
7450 if (cgraph_state
== CGRAPH_STATE_PARSING
)
7452 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7453 add_asm_node (build_string (strlen (buf
), buf
));
7456 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7459 #include "gt-varasm.h"