1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2018 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
38 #include "stringpool.h"
42 #include "diagnostic-core.h"
43 #include "fold-const.h"
44 #include "stor-layout.h"
51 #include "langhooks.h"
53 #include "common/common-target.h"
54 #include "stringpool.h"
58 #include "file-prefix-map.h" /* remap_debug_filename() */
60 #ifdef XCOFF_DEBUGGING_INFO
61 #include "xcoffout.h" /* Needed for external data declarations. */
64 /* The (assembler) name of the first globally-visible object output. */
65 extern GTY(()) const char *first_global_object_name
;
66 extern GTY(()) const char *weak_global_object_name
;
68 const char *first_global_object_name
;
69 const char *weak_global_object_name
;
72 struct constant_descriptor_rtx
;
73 struct rtx_constant_pool
;
75 #define n_deferred_constants (crtl->varasm.deferred_constants)
77 /* Number for making the label on the next
78 constant that is stored in memory. */
80 static GTY(()) int const_labelno
;
82 /* Carry information from ASM_DECLARE_OBJECT_NAME
83 to ASM_FINISH_DECLARE_OBJECT. */
85 int size_directive_output
;
87 /* The last decl for which assemble_variable was called,
88 if it did ASM_DECLARE_OBJECT_NAME.
89 If the last call to assemble_variable didn't do that,
92 tree last_assemble_variable_decl
;
94 /* The following global variable indicates if the first basic block
95 in a function belongs to the cold partition or not. */
97 bool first_function_block_is_cold
;
99 /* Whether we saw any functions with no_split_stack. */
101 static bool saw_no_split_stack
;
103 static const char *strip_reg_name (const char *);
104 static int contains_pointers_p (tree
);
105 #ifdef ASM_OUTPUT_EXTERNAL
106 static bool incorporeal_function_p (tree
);
108 static void decode_addr_const (tree
, struct addr_const
*);
109 static hashval_t
const_hash_1 (const tree
);
110 static int compare_constant (const tree
, const tree
);
111 static void output_constant_def_contents (rtx
);
112 static void output_addressed_constants (tree
);
113 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
115 static void globalize_decl (tree
);
116 static bool decl_readonly_section_1 (enum section_category
);
117 #ifdef BSS_SECTION_ASM_OP
118 #ifdef ASM_OUTPUT_ALIGNED_BSS
119 static void asm_output_aligned_bss (FILE *, tree
, const char *,
120 unsigned HOST_WIDE_INT
, int)
123 #endif /* BSS_SECTION_ASM_OP */
124 static void mark_weak (tree
);
125 static void output_constant_pool (const char *, tree
);
126 static void handle_vtv_comdat_section (section
*, const_tree
);
128 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
129 section
*text_section
;
130 section
*data_section
;
131 section
*readonly_data_section
;
132 section
*sdata_section
;
133 section
*ctors_section
;
134 section
*dtors_section
;
135 section
*bss_section
;
136 section
*sbss_section
;
138 /* Various forms of common section. All are guaranteed to be nonnull. */
139 section
*tls_comm_section
;
140 section
*comm_section
;
141 section
*lcomm_section
;
143 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
145 section
*bss_noswitch_section
;
147 /* The section that holds the main exception table, when known. The section
148 is set either by the target's init_sections hook or by the first call to
149 switch_to_exception_section. */
150 section
*exception_section
;
152 /* The section that holds the DWARF2 frame unwind information, when known.
153 The section is set either by the target's init_sections hook or by the
154 first call to switch_to_eh_frame_section. */
155 section
*eh_frame_section
;
157 /* asm_out_file's current section. This is NULL if no section has yet
158 been selected or if we lose track of what the current section is. */
161 /* True if code for the current function is currently being directed
162 at the cold section. */
163 bool in_cold_section_p
;
165 /* The following global holds the "function name" for the code in the
166 cold section of a function, if hot/cold function splitting is enabled
167 and there was actually code that went into the cold section. A
168 pseudo function name is needed for the cold section of code for some
169 debugging tools that perform symbolization. */
170 tree cold_function_name
= NULL_TREE
;
172 /* A linked list of all the unnamed sections. */
173 static GTY(()) section
*unnamed_sections
;
175 /* Return a nonzero value if DECL has a section attribute. */
176 #define IN_NAMED_SECTION(DECL) \
177 (VAR_OR_FUNCTION_DECL_P (DECL) && DECL_SECTION_NAME (DECL) != NULL)
179 struct section_hasher
: ggc_ptr_hash
<section
>
181 typedef const char *compare_type
;
183 static hashval_t
hash (section
*);
184 static bool equal (section
*, const char *);
187 /* Hash table of named sections. */
188 static GTY(()) hash_table
<section_hasher
> *section_htab
;
190 struct object_block_hasher
: ggc_ptr_hash
<object_block
>
192 typedef const section
*compare_type
;
194 static hashval_t
hash (object_block
*);
195 static bool equal (object_block
*, const section
*);
198 /* A table of object_blocks, indexed by section. */
199 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
201 /* The next number to use for internal anchor labels. */
202 static GTY(()) int anchor_labelno
;
204 /* A pool of constants that can be shared between functions. */
205 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
207 /* Helper routines for maintaining section_htab. */
210 section_hasher::equal (section
*old
, const char *new_name
)
212 return strcmp (old
->named
.name
, new_name
) == 0;
216 section_hasher::hash (section
*old
)
218 return htab_hash_string (old
->named
.name
);
221 /* Return a hash value for section SECT. */
224 hash_section (section
*sect
)
226 if (sect
->common
.flags
& SECTION_NAMED
)
227 return htab_hash_string (sect
->named
.name
);
228 return sect
->common
.flags
& ~SECTION_DECLARED
;
231 /* Helper routines for maintaining object_block_htab. */
234 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
236 return old
->sect
== new_section
;
240 object_block_hasher::hash (object_block
*old
)
242 return hash_section (old
->sect
);
245 /* Return a new unnamed section with the given fields. */
248 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
253 sect
= ggc_alloc
<section
> ();
254 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
255 sect
->unnamed
.callback
= callback
;
256 sect
->unnamed
.data
= data
;
257 sect
->unnamed
.next
= unnamed_sections
;
259 unnamed_sections
= sect
;
263 /* Return a SECTION_NOSWITCH section with the given fields. */
266 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
270 sect
= ggc_alloc
<section
> ();
271 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
272 sect
->noswitch
.callback
= callback
;
277 /* Return the named section structure associated with NAME. Create
278 a new section with the given fields if no such structure exists. */
281 get_section (const char *name
, unsigned int flags
, tree decl
)
283 section
*sect
, **slot
;
285 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
287 flags
|= SECTION_NAMED
;
290 sect
= ggc_alloc
<section
> ();
291 sect
->named
.common
.flags
= flags
;
292 sect
->named
.name
= ggc_strdup (name
);
293 sect
->named
.decl
= decl
;
299 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
300 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
302 /* It is fine if one of the section flags is
303 SECTION_WRITE | SECTION_RELRO and the other has none of these
304 flags (i.e. read-only) in named sections and either the
305 section hasn't been declared yet or has been declared as writable.
306 In that case just make sure the resulting flags are
307 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
309 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
310 == (SECTION_WRITE
| SECTION_RELRO
)
311 && (sect
->common
.flags
312 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
313 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
314 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
315 || (sect
->common
.flags
& SECTION_WRITE
)))
317 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
320 /* Sanity check user variables for flag changes. */
321 if (sect
->named
.decl
!= NULL
322 && DECL_P (sect
->named
.decl
)
323 && decl
!= sect
->named
.decl
)
325 if (decl
!= NULL
&& DECL_P (decl
))
326 error ("%+qD causes a section type conflict with %qD",
327 decl
, sect
->named
.decl
);
329 error ("section type conflict with %qD", sect
->named
.decl
);
330 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
331 "%qD was declared here", sect
->named
.decl
);
333 else if (decl
!= NULL
&& DECL_P (decl
))
334 error ("%+qD causes a section type conflict", decl
);
336 error ("section type conflict");
337 /* Make sure we don't error about one section multiple times. */
338 sect
->common
.flags
|= SECTION_OVERRIDE
;
344 /* Return true if the current compilation mode benefits from having
345 objects grouped into blocks. */
348 use_object_blocks_p (void)
350 return flag_section_anchors
;
353 /* Return the object_block structure for section SECT. Create a new
354 structure if we haven't created one already. Return null if SECT
357 static struct object_block
*
358 get_block_for_section (section
*sect
)
360 struct object_block
*block
;
366 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
371 block
= ggc_cleared_alloc
<object_block
> ();
378 /* Create a symbol with label LABEL and place it at byte offset
379 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
380 is not yet known. LABEL must be a garbage-collected string. */
383 create_block_symbol (const char *label
, struct object_block
*block
,
384 HOST_WIDE_INT offset
)
389 /* Create the extended SYMBOL_REF. */
390 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
391 symbol
= (rtx
) ggc_internal_alloc (size
);
393 /* Initialize the normal SYMBOL_REF fields. */
394 memset (symbol
, 0, size
);
395 PUT_CODE (symbol
, SYMBOL_REF
);
396 PUT_MODE (symbol
, Pmode
);
397 XSTR (symbol
, 0) = label
;
398 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
400 /* Initialize the block_symbol stuff. */
401 SYMBOL_REF_BLOCK (symbol
) = block
;
402 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
407 /* Return a section with a particular name and with whatever SECTION_*
408 flags section_type_flags deems appropriate. The name of the section
409 is taken from NAME if nonnull, otherwise it is taken from DECL's
410 DECL_SECTION_NAME. DECL is the decl associated with the section
411 (see the section comment for details) and RELOC is as for
412 section_type_flags. */
415 get_named_section (tree decl
, const char *name
, int reloc
)
421 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
422 name
= DECL_SECTION_NAME (decl
);
425 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
426 return get_section (name
, flags
, decl
);
429 /* Worker for resolve_unique_section. */
432 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
434 n
->implicit_section
= true;
438 /* If required, set DECL_SECTION_NAME to a unique name. */
441 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
442 int flag_function_or_data_sections
)
444 if (DECL_SECTION_NAME (decl
) == NULL
445 && targetm_common
.have_named_sections
446 && (flag_function_or_data_sections
447 || DECL_COMDAT_GROUP (decl
)))
449 targetm
.asm_out
.unique_section (decl
, reloc
);
450 if (DECL_SECTION_NAME (decl
))
451 symtab_node::get (decl
)->call_for_symbol_and_aliases
452 (set_implicit_section
, NULL
, true);
456 #ifdef BSS_SECTION_ASM_OP
458 #ifdef ASM_OUTPUT_ALIGNED_BSS
460 /* Utility function for targets to use in implementing
461 ASM_OUTPUT_ALIGNED_BSS.
462 ??? It is believed that this function will work in most cases so such
463 support is localized here. */
466 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
467 const char *name
, unsigned HOST_WIDE_INT size
,
470 switch_to_section (bss_section
);
471 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
472 #ifdef ASM_DECLARE_OBJECT_NAME
473 last_assemble_variable_decl
= decl
;
474 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
476 /* Standard thing is just output label for the object. */
477 ASM_OUTPUT_LABEL (file
, name
);
478 #endif /* ASM_DECLARE_OBJECT_NAME */
479 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
484 #endif /* BSS_SECTION_ASM_OP */
486 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
487 /* Return the hot section for function DECL. Return text_section for
491 hot_function_section (tree decl
)
493 if (decl
!= NULL_TREE
494 && DECL_SECTION_NAME (decl
) != NULL
495 && targetm_common
.have_named_sections
)
496 return get_named_section (decl
, NULL
, 0);
502 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
505 When DECL_SECTION_NAME is non-NULL and it is implicit section and
506 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
507 concatenate the name with NAMED_SECTION_SUFFIX.
508 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
511 get_named_text_section (tree decl
,
512 const char *text_section_name
,
513 const char *named_section_suffix
)
515 if (decl
&& DECL_SECTION_NAME (decl
))
517 if (named_section_suffix
)
519 const char *dsn
= DECL_SECTION_NAME (decl
);
520 const char *stripped_name
;
523 name
= (char *) alloca (strlen (dsn
) + 1);
527 stripped_name
= targetm
.strip_name_encoding (name
);
529 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
530 return get_named_section (decl
, buffer
, 0);
532 else if (symtab_node::get (decl
)->implicit_section
)
536 /* Do not try to split gnu_linkonce functions. This gets somewhat
538 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
540 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
541 name
= targetm
.strip_name_encoding (name
);
542 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
548 return get_named_section (decl
, text_section_name
, 0);
551 /* Choose named function section based on its frequency. */
554 default_function_section (tree decl
, enum node_frequency freq
,
555 bool startup
, bool exit
)
557 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
558 /* Old GNU linkers have buggy --gc-section support, which sometimes
559 results in .gcc_except_table* sections being garbage collected. */
561 && symtab_node::get (decl
)->implicit_section
)
565 if (!flag_reorder_functions
566 || !targetm_common
.have_named_sections
)
568 /* Startup code should go to startup subsection unless it is
569 unlikely executed (this happens especially with function splitting
570 where we can split away unnecessary parts of static constructors. */
571 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
573 /* If we do have a profile or(and) LTO phase is executed, we do not need
574 these ELF section. */
575 if (!in_lto_p
|| !flag_profile_values
)
576 return get_named_text_section (decl
, ".text.startup", NULL
);
581 /* Similarly for exit. */
582 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
583 return get_named_text_section (decl
, ".text.exit", NULL
);
585 /* Group cold functions together, similarly for hot code. */
588 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
589 return get_named_text_section (decl
, ".text.unlikely", NULL
);
590 case NODE_FREQUENCY_HOT
:
591 /* If we do have a profile or(and) LTO phase is executed, we do not need
592 these ELF section. */
593 if (!in_lto_p
|| !flag_profile_values
)
594 return get_named_text_section (decl
, ".text.hot", NULL
);
601 /* Return the section for function DECL.
603 If DECL is NULL_TREE, return the text section. We can be passed
604 NULL_TREE under some circumstances by dbxout.c at least.
606 If FORCE_COLD is true, return cold function section ignoring
607 the frequency info of cgraph_node. */
610 function_section_1 (tree decl
, bool force_cold
)
612 section
*section
= NULL
;
613 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
614 bool startup
= false, exit
= false;
618 struct cgraph_node
*node
= cgraph_node::get (decl
);
622 freq
= node
->frequency
;
623 startup
= node
->only_called_at_startup
;
624 exit
= node
->only_called_at_exit
;
628 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
630 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
631 if (decl
!= NULL_TREE
632 && DECL_SECTION_NAME (decl
) != NULL
)
634 if (targetm
.asm_out
.function_section
)
635 section
= targetm
.asm_out
.function_section (decl
, freq
,
639 return get_named_section (decl
, NULL
, 0);
642 return targetm
.asm_out
.select_section
643 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
644 symtab_node::get (decl
)->definition_alignment ());
646 if (targetm
.asm_out
.function_section
)
647 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
650 return hot_function_section (decl
);
654 /* Return the section for function DECL.
656 If DECL is NULL_TREE, return the text section. We can be passed
657 NULL_TREE under some circumstances by dbxout.c at least. */
660 function_section (tree decl
)
662 /* Handle cases where function splitting code decides
663 to put function entry point into unlikely executed section
664 despite the fact that the function itself is not cold
665 (i.e. it is called rarely but contains a hot loop that is
666 better to live in hot subsection for the code locality). */
667 return function_section_1 (decl
,
668 first_function_block_is_cold
);
671 /* Return the section for the current function, take IN_COLD_SECTION_P
675 current_function_section (void)
677 return function_section_1 (current_function_decl
, in_cold_section_p
);
680 /* Tell assembler to switch to unlikely-to-be-executed text section. */
683 unlikely_text_section (void)
685 return function_section_1 (current_function_decl
, true);
688 /* When called within a function context, return true if the function
689 has been assigned a cold text section and if SECT is that section.
690 When called outside a function context, return true if SECT is the
691 default cold section. */
694 unlikely_text_section_p (section
*sect
)
696 return sect
== function_section_1 (current_function_decl
, true);
699 /* Switch to the other function partition (if inside of hot section
700 into cold section, otherwise into the hot section). */
703 switch_to_other_text_partition (void)
705 in_cold_section_p
= !in_cold_section_p
;
706 switch_to_section (current_function_section ());
709 /* Return the read-only data section associated with function DECL. */
712 default_function_rodata_section (tree decl
)
714 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
716 const char *name
= DECL_SECTION_NAME (decl
);
718 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
724 dot
= strchr (name
+ 1, '.');
727 len
= strlen (dot
) + 8;
728 rname
= (char *) alloca (len
);
730 strcpy (rname
, ".rodata");
732 return get_section (rname
, SECTION_LINKONCE
, decl
);
734 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
735 else if (DECL_COMDAT_GROUP (decl
)
736 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
738 size_t len
= strlen (name
) + 1;
739 char *rname
= (char *) alloca (len
);
741 memcpy (rname
, name
, len
);
743 return get_section (rname
, SECTION_LINKONCE
, decl
);
745 /* For .text.foo we want to use .rodata.foo. */
746 else if (flag_function_sections
&& flag_data_sections
747 && strncmp (name
, ".text.", 6) == 0)
749 size_t len
= strlen (name
) + 1;
750 char *rname
= (char *) alloca (len
+ 2);
752 memcpy (rname
, ".rodata", 7);
753 memcpy (rname
+ 7, name
+ 5, len
- 5);
754 return get_section (rname
, 0, decl
);
758 return readonly_data_section
;
761 /* Return the read-only data section associated with function DECL
762 for targets where that section should be always the single
763 readonly data section. */
766 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
768 return readonly_data_section
;
771 /* A subroutine of mergeable_string_section and mergeable_constant_section. */
774 function_mergeable_rodata_prefix (void)
776 section
*s
= targetm
.asm_out
.function_rodata_section (current_function_decl
);
777 if (SECTION_STYLE (s
) == SECTION_NAMED
)
778 return s
->named
.name
;
780 return targetm
.asm_out
.mergeable_rodata_prefix
;
783 /* Return the section to use for string merging. */
786 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
787 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
788 unsigned int flags ATTRIBUTE_UNUSED
)
792 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
793 && TREE_CODE (decl
) == STRING_CST
794 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
796 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
797 && TREE_STRING_LENGTH (decl
) >= len
)
799 scalar_int_mode mode
;
800 unsigned int modesize
;
804 const char *prefix
= function_mergeable_rodata_prefix ();
805 char *name
= (char *) alloca (strlen (prefix
) + 30);
807 mode
= SCALAR_INT_TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
808 modesize
= GET_MODE_BITSIZE (mode
);
809 if (modesize
>= 8 && modesize
<= 256
810 && (modesize
& (modesize
- 1)) == 0)
812 if (align
< modesize
)
815 str
= TREE_STRING_POINTER (decl
);
816 unit
= GET_MODE_SIZE (mode
);
818 /* Check for embedded NUL characters. */
819 for (i
= 0; i
< len
; i
+= unit
)
821 for (j
= 0; j
< unit
; j
++)
822 if (str
[i
+ j
] != '\0')
829 sprintf (name
, "%s.str%d.%d", prefix
,
830 modesize
/ 8, (int) (align
/ 8));
831 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
832 return get_section (name
, flags
, NULL
);
837 return readonly_data_section
;
840 /* Return the section to use for constant merging. */
843 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
844 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
845 unsigned int flags ATTRIBUTE_UNUSED
)
847 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
850 && known_le (GET_MODE_BITSIZE (mode
), align
)
853 && (align
& (align
- 1)) == 0)
855 const char *prefix
= function_mergeable_rodata_prefix ();
856 char *name
= (char *) alloca (strlen (prefix
) + 30);
858 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
859 flags
|= (align
/ 8) | SECTION_MERGE
;
860 return get_section (name
, flags
, NULL
);
862 return readonly_data_section
;
865 /* Given NAME, a putative register name, discard any customary prefixes. */
868 strip_reg_name (const char *name
)
870 #ifdef REGISTER_PREFIX
871 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
872 name
+= strlen (REGISTER_PREFIX
);
874 if (name
[0] == '%' || name
[0] == '#')
879 /* The user has asked for a DECL to have a particular name. Set (or
880 change) it in such a way that we don't prefix an underscore to
883 set_user_assembler_name (tree decl
, const char *name
)
885 char *starred
= (char *) alloca (strlen (name
) + 2);
887 strcpy (starred
+ 1, name
);
888 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
889 SET_DECL_RTL (decl
, NULL_RTX
);
892 /* Decode an `asm' spec for a declaration as a register name.
893 Return the register number, or -1 if nothing specified,
894 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
895 or -3 if ASMSPEC is `cc' and is not recognized,
896 or -4 if ASMSPEC is `memory' and is not recognized.
897 Accept an exact spelling or a decimal number.
898 Prefixes such as % are optional. */
901 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
903 /* Presume just one register is clobbered. */
910 /* Get rid of confusing prefixes. */
911 asmspec
= strip_reg_name (asmspec
);
913 /* Allow a decimal number as a "register name". */
914 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
915 if (! ISDIGIT (asmspec
[i
]))
917 if (asmspec
[0] != 0 && i
< 0)
920 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
926 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
928 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
931 #ifdef OVERLAPPING_REGISTER_NAMES
935 const char *const name
;
938 } table
[] = OVERLAPPING_REGISTER_NAMES
;
940 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
942 && ! strcmp (asmspec
, table
[i
].name
))
944 *pnregs
= table
[i
].nregs
;
945 return table
[i
].number
;
948 #endif /* OVERLAPPING_REGISTER_NAMES */
950 #ifdef ADDITIONAL_REGISTER_NAMES
952 static const struct { const char *const name
; const int number
; } table
[]
953 = ADDITIONAL_REGISTER_NAMES
;
955 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
957 && ! strcmp (asmspec
, table
[i
].name
)
958 && reg_names
[table
[i
].number
][0])
959 return table
[i
].number
;
961 #endif /* ADDITIONAL_REGISTER_NAMES */
963 if (!strcmp (asmspec
, "memory"))
966 if (!strcmp (asmspec
, "cc"))
976 decode_reg_name (const char *name
)
979 return decode_reg_name_and_count (name
, &count
);
983 /* Return true if DECL's initializer is suitable for a BSS section. */
986 bss_initializer_p (const_tree decl
, bool named
)
988 /* Do not put non-common constants into the .bss section, they belong in
989 a readonly section, except when NAMED is true. */
990 return ((!TREE_READONLY (decl
) || DECL_COMMON (decl
) || named
)
991 && (DECL_INITIAL (decl
) == NULL
992 /* In LTO we have no errors in program; error_mark_node is used
993 to mark offlined constructors. */
994 || (DECL_INITIAL (decl
) == error_mark_node
996 || (flag_zero_initialized_in_bss
997 && initializer_zerop (DECL_INITIAL (decl
)))));
1000 /* Compute the alignment of variable specified by DECL.
1001 DONT_OUTPUT_DATA is from assemble_variable. */
1004 align_variable (tree decl
, bool dont_output_data
)
1006 unsigned int align
= DECL_ALIGN (decl
);
1008 /* In the case for initialing an array whose length isn't specified,
1009 where we have not yet been able to do the layout,
1010 figure out the proper alignment now. */
1011 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1012 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1013 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1015 /* Some object file formats have a maximum alignment which they support.
1016 In particular, a.out format supports a maximum alignment of 4. */
1017 if (align
> MAX_OFILE_ALIGNMENT
)
1019 error ("alignment of %q+D is greater than maximum object "
1020 "file alignment %d", decl
,
1021 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1022 align
= MAX_OFILE_ALIGNMENT
;
1025 if (! DECL_USER_ALIGN (decl
))
1027 #ifdef DATA_ABI_ALIGNMENT
1028 unsigned int data_abi_align
1029 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1030 /* For backwards compatibility, don't assume the ABI alignment for
1032 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1033 align
= data_abi_align
;
1036 /* On some machines, it is good to increase alignment sometimes.
1037 But as DECL_ALIGN is used both for actually emitting the variable
1038 and for code accessing the variable as guaranteed alignment, we
1039 can only increase the alignment if it is a performance optimization
1040 if the references to it must bind to the current definition. */
1041 if (decl_binds_to_current_def_p (decl
)
1042 && !DECL_VIRTUAL_P (decl
))
1044 #ifdef DATA_ALIGNMENT
1045 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1046 /* Don't increase alignment too much for TLS variables - TLS space
1048 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1051 if (DECL_INITIAL (decl
) != 0
1052 /* In LTO we have no errors in program; error_mark_node is used
1053 to mark offlined constructors. */
1054 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1056 unsigned int const_align
1057 = targetm
.constant_alignment (DECL_INITIAL (decl
), align
);
1058 /* Don't increase alignment too much for TLS variables - TLS
1059 space is too precious. */
1060 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1061 align
= const_align
;
1066 /* Reset the alignment in case we have made it tighter, so we can benefit
1067 from it in get_pointer_alignment. */
1068 SET_DECL_ALIGN (decl
, align
);
1071 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1072 beyond what align_variable returned. */
1075 get_variable_align (tree decl
)
1077 unsigned int align
= DECL_ALIGN (decl
);
1079 /* For user aligned vars or static vars align_variable already did
1081 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1084 #ifdef DATA_ABI_ALIGNMENT
1085 if (DECL_THREAD_LOCAL_P (decl
))
1086 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1089 /* For decls that bind to the current definition, align_variable
1090 did also everything, except for not assuming ABI required alignment
1091 of TLS variables. For other vars, increase the alignment here
1092 as an optimization. */
1093 if (!decl_binds_to_current_def_p (decl
))
1095 /* On some machines, it is good to increase alignment sometimes. */
1096 #ifdef DATA_ALIGNMENT
1097 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1098 /* Don't increase alignment too much for TLS variables - TLS space
1100 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1103 if (DECL_INITIAL (decl
) != 0
1104 /* In LTO we have no errors in program; error_mark_node is used
1105 to mark offlined constructors. */
1106 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1108 unsigned int const_align
1109 = targetm
.constant_alignment (DECL_INITIAL (decl
), align
);
1110 /* Don't increase alignment too much for TLS variables - TLS space
1112 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1113 align
= const_align
;
1120 /* Return the section into which the given VAR_DECL or CONST_DECL
1121 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1122 section should be used wherever possible. */
1125 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1127 addr_space_t as
= ADDR_SPACE_GENERIC
;
1129 varpool_node
*vnode
= varpool_node::get (decl
);
1132 vnode
= vnode
->ultimate_alias_target ();
1136 if (TREE_TYPE (decl
) != error_mark_node
)
1137 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1139 /* We need the constructor to figure out reloc flag. */
1141 vnode
->get_constructor ();
1143 if (DECL_COMMON (decl
))
1145 /* If the decl has been given an explicit section name, or it resides
1146 in a non-generic address space, then it isn't common, and shouldn't
1147 be handled as such. */
1148 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1149 && ADDR_SPACE_GENERIC_P (as
));
1150 if (DECL_THREAD_LOCAL_P (decl
))
1151 return tls_comm_section
;
1152 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1153 return comm_section
;
1156 if (DECL_INITIAL (decl
) == error_mark_node
)
1157 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1158 else if (DECL_INITIAL (decl
))
1159 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1163 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1164 if (IN_NAMED_SECTION (decl
))
1166 section
*sect
= get_named_section (decl
, NULL
, reloc
);
1168 if ((sect
->common
.flags
& SECTION_BSS
)
1169 && !bss_initializer_p (decl
, true))
1171 error_at (DECL_SOURCE_LOCATION (decl
),
1172 "only zero initializers are allowed in section %qs",
1174 DECL_INITIAL (decl
) = error_mark_node
;
1179 if (ADDR_SPACE_GENERIC_P (as
)
1180 && !DECL_THREAD_LOCAL_P (decl
)
1181 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1182 && bss_initializer_p (decl
))
1184 if (!TREE_PUBLIC (decl
)
1185 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1186 && asan_protect_global (decl
)))
1187 return lcomm_section
;
1188 if (bss_noswitch_section
)
1189 return bss_noswitch_section
;
1192 return targetm
.asm_out
.select_section (decl
, reloc
,
1193 get_variable_align (decl
));
1196 /* Return the block into which object_block DECL should be placed. */
1198 static struct object_block
*
1199 get_block_for_decl (tree decl
)
1205 /* The object must be defined in this translation unit. */
1206 if (DECL_EXTERNAL (decl
))
1209 /* There's no point using object blocks for something that is
1210 isolated by definition. */
1211 if (DECL_COMDAT_GROUP (decl
))
1215 /* We can only calculate block offsets if the decl has a known
1217 if (DECL_SIZE_UNIT (decl
) == NULL
)
1219 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1222 /* Find out which section should contain DECL. We cannot put it into
1223 an object block if it requires a standalone definition. */
1225 align_variable (decl
, 0);
1226 sect
= get_variable_section (decl
, true);
1227 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1230 return get_block_for_section (sect
);
1233 /* Make sure block symbol SYMBOL is in block BLOCK. */
1236 change_symbol_block (rtx symbol
, struct object_block
*block
)
1238 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1240 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1241 SYMBOL_REF_BLOCK (symbol
) = block
;
1245 /* Return true if it is possible to put DECL in an object_block. */
1248 use_blocks_for_decl_p (tree decl
)
1250 struct symtab_node
*snode
;
1252 /* Only data DECLs can be placed into object blocks. */
1253 if (!VAR_P (decl
) && TREE_CODE (decl
) != CONST_DECL
)
1256 /* If this decl is an alias, then we don't want to emit a
1259 && (snode
= symtab_node::get (decl
)) != NULL
1263 return targetm
.use_blocks_for_decl_p (decl
);
1266 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1267 until we find an identifier that is not itself a transparent alias.
1268 Modify the alias passed to it by reference (and all aliases on the
1269 way to the ultimate target), such that they do not have to be
1270 followed again, and return the ultimate target of the alias
1274 ultimate_transparent_alias_target (tree
*alias
)
1276 tree target
= *alias
;
1278 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1280 gcc_assert (TREE_CHAIN (target
));
1281 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1282 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1283 && ! TREE_CHAIN (target
));
1290 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1291 have static storage duration. In other words, it should not be an
1292 automatic variable, including PARM_DECLs.
1294 There is, however, one exception: this function handles variables
1295 explicitly placed in a particular register by the user.
1297 This is never called for PARM_DECL nodes. */
1300 make_decl_rtl (tree decl
)
1302 const char *name
= 0;
1307 /* Check that we are not being given an automatic variable. */
1308 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1309 && TREE_CODE (decl
) != RESULT_DECL
);
1311 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1312 gcc_assert (!VAR_P (decl
)
1313 || TREE_STATIC (decl
)
1314 || TREE_PUBLIC (decl
)
1315 || DECL_EXTERNAL (decl
)
1316 || DECL_REGISTER (decl
));
1318 /* And that we were not given a type or a label. */
1319 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1320 && TREE_CODE (decl
) != LABEL_DECL
);
1322 /* For a duplicate declaration, we can be called twice on the
1323 same DECL node. Don't discard the RTL already made. */
1324 if (DECL_RTL_SET_P (decl
))
1326 /* If the old RTL had the wrong mode, fix the mode. */
1327 x
= DECL_RTL (decl
);
1328 if (GET_MODE (x
) != DECL_MODE (decl
))
1329 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1331 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1334 /* ??? Another way to do this would be to maintain a hashed
1335 table of such critters. Instead of adding stuff to a DECL
1336 to give certain attributes to it, we could use an external
1337 hash map from DECL to set of attributes. */
1339 /* Let the target reassign the RTL if it wants.
1340 This is necessary, for example, when one machine specific
1341 decl attribute overrides another. */
1342 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1344 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1345 on the new decl information. */
1347 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1348 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1349 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1354 /* If this variable belongs to the global constant pool, retrieve the
1355 pre-computed RTL or recompute it in LTO mode. */
1356 if (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
1358 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1362 id
= DECL_ASSEMBLER_NAME (decl
);
1363 if (TREE_CODE (decl
) == FUNCTION_DECL
1364 && cgraph_node::get (decl
)
1365 && cgraph_node::get (decl
)->instrumentation_clone
)
1366 ultimate_transparent_alias_target (&id
);
1367 name
= IDENTIFIER_POINTER (id
);
1369 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1370 && DECL_REGISTER (decl
))
1372 error ("register name not specified for %q+D", decl
);
1374 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1376 const char *asmspec
= name
+1;
1377 machine_mode mode
= DECL_MODE (decl
);
1378 reg_number
= decode_reg_name (asmspec
);
1379 /* First detect errors in declaring global registers. */
1380 if (reg_number
== -1)
1381 error ("register name not specified for %q+D", decl
);
1382 else if (reg_number
< 0)
1383 error ("invalid register name for %q+D", decl
);
1384 else if (mode
== BLKmode
)
1385 error ("data type of %q+D isn%'t suitable for a register",
1387 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1388 error ("the register specified for %q+D cannot be accessed"
1389 " by the current target", decl
);
1390 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1391 error ("the register specified for %q+D is not general enough"
1392 " to be used as a register variable", decl
);
1393 else if (!targetm
.hard_regno_mode_ok (reg_number
, mode
))
1394 error ("register specified for %q+D isn%'t suitable for data type",
1396 /* Now handle properly declared static register variables. */
1401 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1403 DECL_INITIAL (decl
) = 0;
1404 error ("global register variable has initial value");
1406 if (TREE_THIS_VOLATILE (decl
))
1407 warning (OPT_Wvolatile_register_var
,
1408 "optimization may eliminate reads and/or "
1409 "writes to register variables");
1411 /* If the user specified one of the eliminables registers here,
1412 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1413 confused with that register and be eliminated. This usage is
1414 somewhat suspect... */
1416 SET_DECL_RTL (decl
, gen_raw_REG (mode
, reg_number
));
1417 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1418 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1420 if (TREE_STATIC (decl
))
1422 /* Make this register global, so not usable for anything
1424 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1425 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1426 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1428 nregs
= hard_regno_nregs (reg_number
, mode
);
1430 globalize_reg (decl
, reg_number
+ --nregs
);
1433 /* As a register variable, it has no section. */
1436 /* Avoid internal errors from invalid register
1438 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1439 DECL_HARD_REGISTER (decl
) = 0;
1440 /* Also avoid SSA inconsistencies by pretending this is an external
1442 DECL_EXTERNAL (decl
) = 1;
1445 /* Now handle ordinary static variables and functions (in memory).
1446 Also handle vars declared register invalidly. */
1447 else if (name
[0] == '*')
1449 #ifdef REGISTER_PREFIX
1450 if (strlen (REGISTER_PREFIX
) != 0)
1452 reg_number
= decode_reg_name (name
);
1453 if (reg_number
>= 0 || reg_number
== -3)
1454 error ("register name given for non-register variable %q+D", decl
);
1459 /* Specifying a section attribute on a variable forces it into a
1460 non-.bss section, and thus it cannot be common. */
1461 /* FIXME: In general this code should not be necessary because
1462 visibility pass is doing the same work. But notice_global_symbol
1463 is called early and it needs to make DECL_RTL to get the name.
1464 we take care of recomputing the DECL_RTL after visibility is changed. */
1466 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1467 && DECL_SECTION_NAME (decl
) != NULL
1468 && DECL_INITIAL (decl
) == NULL_TREE
1469 && DECL_COMMON (decl
))
1470 DECL_COMMON (decl
) = 0;
1472 /* Variables can't be both common and weak. */
1473 if (VAR_P (decl
) && DECL_WEAK (decl
))
1474 DECL_COMMON (decl
) = 0;
1476 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1477 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1480 machine_mode address_mode
= Pmode
;
1481 if (TREE_TYPE (decl
) != error_mark_node
)
1483 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1484 address_mode
= targetm
.addr_space
.address_mode (as
);
1486 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1488 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1489 SET_SYMBOL_REF_DECL (x
, decl
);
1491 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1492 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1493 set_mem_attributes (x
, decl
, 1);
1494 SET_DECL_RTL (decl
, x
);
1496 /* Optionally set flags or add text to the name to record information
1497 such as that it is a function name.
1498 If the name is changed, the macro ASM_OUTPUT_LABELREF
1499 will have to know how to strip this information. */
1500 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1503 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1504 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1508 make_decl_rtl_for_debug (tree decl
)
1510 unsigned int save_aliasing_flag
;
1513 if (DECL_RTL_SET_P (decl
))
1514 return DECL_RTL (decl
);
1516 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1517 call new_alias_set. If running with -fcompare-debug, sometimes
1518 we do not want to create alias sets that will throw the alias
1519 numbers off in the comparison dumps. So... clearing
1520 flag_strict_aliasing will keep new_alias_set() from creating a
1522 save_aliasing_flag
= flag_strict_aliasing
;
1523 flag_strict_aliasing
= 0;
1525 rtl
= DECL_RTL (decl
);
1526 /* Reset DECL_RTL back, as various parts of the compiler expects
1527 DECL_RTL set meaning it is actually going to be output. */
1528 SET_DECL_RTL (decl
, NULL
);
1530 flag_strict_aliasing
= save_aliasing_flag
;
1534 /* Output a string of literal assembler code
1535 for an `asm' keyword used between functions. */
1538 assemble_asm (tree string
)
1543 if (TREE_CODE (string
) == ADDR_EXPR
)
1544 string
= TREE_OPERAND (string
, 0);
1546 p
= TREE_STRING_POINTER (string
);
1547 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1550 /* Write the address of the entity given by SYMBOL to SEC. */
1552 assemble_addr_to_section (rtx symbol
, section
*sec
)
1554 switch_to_section (sec
);
1555 assemble_align (POINTER_SIZE
);
1556 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1559 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1560 not) section for PRIORITY. */
1562 get_cdtor_priority_section (int priority
, bool constructor_p
)
1564 /* Buffer conservatively large enough for the full range of a 32-bit
1565 int plus the text below. */
1568 /* ??? This only works reliably with the GNU linker. */
1569 sprintf (buf
, "%s.%.5u",
1570 constructor_p
? ".ctors" : ".dtors",
1571 /* Invert the numbering so the linker puts us in the proper
1572 order; constructors are run from right to left, and the
1573 linker sorts in increasing order. */
1574 MAX_INIT_PRIORITY
- priority
);
1575 return get_section (buf
, SECTION_WRITE
, NULL
);
1579 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1583 if (priority
!= DEFAULT_INIT_PRIORITY
)
1584 sec
= get_cdtor_priority_section (priority
,
1585 /*constructor_p=*/false);
1587 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1589 assemble_addr_to_section (symbol
, sec
);
1592 #ifdef DTORS_SECTION_ASM_OP
1594 default_dtor_section_asm_out_destructor (rtx symbol
,
1595 int priority ATTRIBUTE_UNUSED
)
1597 assemble_addr_to_section (symbol
, dtors_section
);
1602 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1606 if (priority
!= DEFAULT_INIT_PRIORITY
)
1607 sec
= get_cdtor_priority_section (priority
,
1608 /*constructor_p=*/true);
1610 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1612 assemble_addr_to_section (symbol
, sec
);
1615 #ifdef CTORS_SECTION_ASM_OP
1617 default_ctor_section_asm_out_constructor (rtx symbol
,
1618 int priority ATTRIBUTE_UNUSED
)
1620 assemble_addr_to_section (symbol
, ctors_section
);
1624 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1625 a nonzero value if the constant pool should be output before the
1626 start of the function, or a zero value if the pool should output
1627 after the end of the function. The default is to put it before the
1630 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1631 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1634 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1635 to be output to assembler.
1636 Set first_global_object_name and weak_global_object_name as appropriate. */
1639 notice_global_symbol (tree decl
)
1641 const char **t
= &first_global_object_name
;
1643 if (first_global_object_name
1644 || !TREE_PUBLIC (decl
)
1645 || DECL_EXTERNAL (decl
)
1646 || !DECL_NAME (decl
)
1647 || (VAR_P (decl
) && DECL_HARD_REGISTER (decl
))
1648 || (TREE_CODE (decl
) != FUNCTION_DECL
1650 || (DECL_COMMON (decl
)
1651 && (DECL_INITIAL (decl
) == 0
1652 || DECL_INITIAL (decl
) == error_mark_node
)))))
1655 /* We win when global object is found, but it is useful to know about weak
1656 symbol as well so we can produce nicer unique names. */
1657 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1658 t
= &weak_global_object_name
;
1662 tree id
= DECL_ASSEMBLER_NAME (decl
);
1663 ultimate_transparent_alias_target (&id
);
1664 *t
= ggc_strdup (targetm
.strip_name_encoding (IDENTIFIER_POINTER (id
)));
1668 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1669 current function goes into the cold section, so that targets can use
1670 current_function_section during RTL expansion. DECL describes the
1674 decide_function_section (tree decl
)
1676 first_function_block_is_cold
= false;
1678 if (DECL_SECTION_NAME (decl
))
1680 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1681 /* Calls to function_section rely on first_function_block_is_cold
1683 first_function_block_is_cold
= (node
1685 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1688 in_cold_section_p
= first_function_block_is_cold
;
1691 /* Get the function's name, as described by its RTL. This may be
1692 different from the DECL_NAME name used in the source file. */
1694 get_fnname_from_decl (tree decl
)
1696 rtx x
= DECL_RTL (decl
);
1697 gcc_assert (MEM_P (x
));
1699 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1703 /* Output assembler code for the constant pool of a function and associated
1704 with defining the name of the function. DECL describes the function.
1705 NAME is the function's name. For the constant pool, we use the current
1706 constant pool data. */
1709 assemble_start_function (tree decl
, const char *fnname
)
1712 char tmp_label
[100];
1713 bool hot_label_written
= false;
1715 if (crtl
->has_bb_partition
)
1717 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1718 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1719 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1720 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1721 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1722 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1723 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1724 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1726 cold_function_name
= NULL_TREE
;
1730 crtl
->subsections
.hot_section_label
= NULL
;
1731 crtl
->subsections
.cold_section_label
= NULL
;
1732 crtl
->subsections
.hot_section_end_label
= NULL
;
1733 crtl
->subsections
.cold_section_end_label
= NULL
;
1736 /* The following code does not need preprocessing in the assembler. */
1740 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1741 output_constant_pool (fnname
, decl
);
1743 align
= symtab_node::get (decl
)->definition_alignment ();
1745 /* Make sure the not and cold text (code) sections are properly
1746 aligned. This is necessary here in the case where the function
1747 has both hot and cold sections, because we don't want to re-set
1748 the alignment when the section switch happens mid-function. */
1750 if (crtl
->has_bb_partition
)
1752 first_function_block_is_cold
= false;
1754 switch_to_section (unlikely_text_section ());
1755 assemble_align (align
);
1756 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1758 /* When the function starts with a cold section, we need to explicitly
1759 align the hot section and write out the hot section label.
1760 But if the current function is a thunk, we do not have a CFG. */
1762 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1764 switch_to_section (text_section
);
1765 assemble_align (align
);
1766 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1767 hot_label_written
= true;
1768 first_function_block_is_cold
= true;
1770 in_cold_section_p
= first_function_block_is_cold
;
1774 /* Switch to the correct text section for the start of the function. */
1776 switch_to_section (function_section (decl
));
1777 if (crtl
->has_bb_partition
&& !hot_label_written
)
1778 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1780 /* Tell assembler to move to target machine's alignment for functions. */
1781 align
= floor_log2 (align
/ BITS_PER_UNIT
);
1784 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1787 /* Handle a user-specified function alignment.
1788 Note that we still need to align to DECL_ALIGN, as above,
1789 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1790 if (! DECL_USER_ALIGN (decl
)
1791 && align_functions_log
> align
1792 && optimize_function_for_speed_p (cfun
))
1794 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1795 int align_log
= align_functions_log
;
1797 int max_skip
= align_functions
- 1;
1798 if (flag_limit_function_alignment
&& crtl
->max_insn_address
> 0
1799 && max_skip
>= crtl
->max_insn_address
)
1800 max_skip
= crtl
->max_insn_address
- 1;
1802 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1803 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
, align_log
, max_skip
);
1805 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1809 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1810 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1813 if (!DECL_IGNORED_P (decl
))
1814 (*debug_hooks
->begin_function
) (decl
);
1816 /* Make function name accessible from other files, if appropriate. */
1818 if (TREE_PUBLIC (decl
)
1819 || (cgraph_node::get (decl
)->instrumentation_clone
1820 && cgraph_node::get (decl
)->instrumented_version
1821 && TREE_PUBLIC (cgraph_node::get (decl
)->instrumented_version
->decl
)))
1823 notice_global_symbol (decl
);
1825 globalize_decl (decl
);
1827 maybe_assemble_visibility (decl
);
1830 if (DECL_PRESERVE_P (decl
))
1831 targetm
.asm_out
.mark_decl_preserved (fnname
);
1833 unsigned HOST_WIDE_INT patch_area_size
= function_entry_patch_area_size
;
1834 unsigned HOST_WIDE_INT patch_area_entry
= function_entry_patch_area_start
;
1836 tree patchable_function_entry_attr
1837 = lookup_attribute ("patchable_function_entry", DECL_ATTRIBUTES (decl
));
1838 if (patchable_function_entry_attr
)
1840 tree pp_val
= TREE_VALUE (patchable_function_entry_attr
);
1841 tree patchable_function_entry_value1
= TREE_VALUE (pp_val
);
1843 if (tree_fits_uhwi_p (patchable_function_entry_value1
))
1844 patch_area_size
= tree_to_uhwi (patchable_function_entry_value1
);
1848 patch_area_entry
= 0;
1849 if (list_length (pp_val
) > 1)
1851 tree patchable_function_entry_value2
=
1852 TREE_VALUE (TREE_CHAIN (pp_val
));
1854 if (tree_fits_uhwi_p (patchable_function_entry_value2
))
1855 patch_area_entry
= tree_to_uhwi (patchable_function_entry_value2
);
1861 if (patch_area_entry
> patch_area_size
)
1863 if (patch_area_size
> 0)
1864 warning (OPT_Wattributes
, "Patchable function entry > size");
1865 patch_area_entry
= 0;
1868 /* Emit the patching area before the entry label, if any. */
1869 if (patch_area_entry
> 0)
1870 targetm
.asm_out
.print_patchable_function_entry (asm_out_file
,
1871 patch_area_entry
, true);
1873 /* Do any machine/system dependent processing of the function name. */
1874 #ifdef ASM_DECLARE_FUNCTION_NAME
1875 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1877 /* Standard thing is just output label for the function. */
1878 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1879 #endif /* ASM_DECLARE_FUNCTION_NAME */
1881 /* And the area after the label. Record it if we haven't done so yet. */
1882 if (patch_area_size
> patch_area_entry
)
1883 targetm
.asm_out
.print_patchable_function_entry (asm_out_file
,
1884 patch_area_size
-patch_area_entry
,
1885 patch_area_entry
== 0);
1887 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1888 saw_no_split_stack
= true;
1891 /* Output assembler code associated with defining the size of the
1892 function. DECL describes the function. NAME is the function's name. */
1895 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1897 #ifdef ASM_DECLARE_FUNCTION_SIZE
1898 /* We could have switched section in the middle of the function. */
1899 if (crtl
->has_bb_partition
)
1900 switch_to_section (function_section (decl
));
1901 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1903 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1905 output_constant_pool (fnname
, decl
);
1906 switch_to_section (function_section (decl
)); /* need to switch back */
1908 /* Output labels for end of hot/cold text sections (to be used by
1910 if (crtl
->has_bb_partition
)
1912 section
*save_text_section
;
1914 save_text_section
= in_section
;
1915 switch_to_section (unlikely_text_section ());
1916 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
1917 if (cold_function_name
!= NULL_TREE
)
1918 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file
,
1919 IDENTIFIER_POINTER (cold_function_name
),
1922 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1923 if (first_function_block_is_cold
)
1924 switch_to_section (text_section
);
1926 switch_to_section (function_section (decl
));
1927 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1928 switch_to_section (save_text_section
);
1932 /* Assemble code to leave SIZE bytes of zeros. */
1935 assemble_zeros (unsigned HOST_WIDE_INT size
)
1937 /* Do no output if -fsyntax-only. */
1938 if (flag_syntax_only
)
1941 #ifdef ASM_NO_SKIP_IN_TEXT
1942 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1943 so we must output 0s explicitly in the text section. */
1944 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1946 unsigned HOST_WIDE_INT i
;
1947 for (i
= 0; i
< size
; i
++)
1948 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1953 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1956 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1959 assemble_align (int align
)
1961 if (align
> BITS_PER_UNIT
)
1963 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1967 /* Assemble a string constant with the specified C string as contents. */
1970 assemble_string (const char *p
, int size
)
1975 /* If the string is very long, split it up. */
1979 int thissize
= size
- pos
;
1980 if (thissize
> maximum
)
1983 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1991 /* A noswitch_section_callback for lcomm_section. */
1994 emit_local (tree decl ATTRIBUTE_UNUSED
,
1995 const char *name ATTRIBUTE_UNUSED
,
1996 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1997 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1999 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
2000 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
2001 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
2004 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
2005 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
2006 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
2009 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2014 /* A noswitch_section_callback for bss_noswitch_section. */
2016 #if defined ASM_OUTPUT_ALIGNED_BSS
2018 emit_bss (tree decl ATTRIBUTE_UNUSED
,
2019 const char *name ATTRIBUTE_UNUSED
,
2020 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2021 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2023 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
2024 get_variable_align (decl
));
2029 /* A noswitch_section_callback for comm_section. */
2032 emit_common (tree decl ATTRIBUTE_UNUSED
,
2033 const char *name ATTRIBUTE_UNUSED
,
2034 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2035 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2037 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
2038 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
2039 size
, get_variable_align (decl
));
2041 #elif defined ASM_OUTPUT_ALIGNED_COMMON
2042 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
2043 get_variable_align (decl
));
2046 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
2051 /* A noswitch_section_callback for tls_comm_section. */
2054 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
2055 const char *name ATTRIBUTE_UNUSED
,
2056 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2057 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2059 #ifdef ASM_OUTPUT_TLS_COMMON
2060 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2063 sorry ("thread-local COMMON data not implemented");
2068 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2069 NAME is the name of DECL's SYMBOL_REF. */
2072 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2075 unsigned HOST_WIDE_INT size
, rounded
;
2077 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2080 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2081 size
+= asan_red_zone_size (size
);
2083 /* Don't allocate zero bytes of common,
2084 since that means "undefined external" in the linker. */
2088 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2089 so that each uninitialized object starts on such a boundary. */
2090 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2091 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2092 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2094 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2095 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2096 error ("requested alignment for %q+D is greater than "
2097 "implemented alignment of %wu", decl
, rounded
);
2100 /* A subroutine of assemble_variable. Output the label and contents of
2101 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2102 is as for assemble_variable. */
2105 assemble_variable_contents (tree decl
, const char *name
,
2106 bool dont_output_data
)
2108 /* Do any machine/system dependent processing of the object. */
2109 #ifdef ASM_DECLARE_OBJECT_NAME
2110 last_assemble_variable_decl
= decl
;
2111 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2113 /* Standard thing is just output label for the object. */
2114 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2115 #endif /* ASM_DECLARE_OBJECT_NAME */
2117 if (!dont_output_data
)
2119 /* Caller is supposed to use varpool_get_constructor when it wants
2120 to output the body. */
2121 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2122 if (DECL_INITIAL (decl
)
2123 && DECL_INITIAL (decl
) != error_mark_node
2124 && !initializer_zerop (DECL_INITIAL (decl
)))
2125 /* Output the actual data. */
2126 output_constant (DECL_INITIAL (decl
),
2127 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2128 get_variable_align (decl
),
2131 /* Leave space for it. */
2132 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2133 targetm
.asm_out
.decl_end ();
2137 /* Write out assembly for the variable DECL, which is not defined in
2138 the current translation unit. */
2140 assemble_undefined_decl (tree decl
)
2142 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2143 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2146 /* Assemble everything that is needed for a variable or function declaration.
2147 Not used for automatic variables, and not used for function definitions.
2148 Should not be called for variables of incomplete structure type.
2150 TOP_LEVEL is nonzero if this variable has file scope.
2151 AT_END is nonzero if this is the special handling, at end of compilation,
2152 to define things that have had only tentative definitions.
2153 DONT_OUTPUT_DATA if nonzero means don't actually output the
2154 initial value (that will be done by the caller). */
2157 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2158 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2161 rtx decl_rtl
, symbol
;
2164 bool asan_protected
= false;
2166 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2167 gcc_assert (VAR_P (decl
));
2169 /* Emulated TLS had better not get this far. */
2170 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2172 last_assemble_variable_decl
= 0;
2174 /* Normally no need to say anything here for external references,
2175 since assemble_external is called by the language-specific code
2176 when a declaration is first seen. */
2178 if (DECL_EXTERNAL (decl
))
2181 /* Do nothing for global register variables. */
2182 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2184 TREE_ASM_WRITTEN (decl
) = 1;
2188 /* If type was incomplete when the variable was declared,
2189 see if it is complete now. */
2191 if (DECL_SIZE (decl
) == 0)
2192 layout_decl (decl
, 0);
2194 /* Still incomplete => don't allocate it; treat the tentative defn
2195 (which is what it must have been) as an `extern' reference. */
2197 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2199 error ("storage size of %q+D isn%'t known", decl
);
2200 TREE_ASM_WRITTEN (decl
) = 1;
2204 /* The first declaration of a variable that comes through this function
2205 decides whether it is global (in C, has external linkage)
2206 or local (in C, has internal linkage). So do nothing more
2207 if this function has already run. */
2209 if (TREE_ASM_WRITTEN (decl
))
2212 /* Make sure targetm.encode_section_info is invoked before we set
2214 decl_rtl
= DECL_RTL (decl
);
2216 TREE_ASM_WRITTEN (decl
) = 1;
2218 /* Do no output if -fsyntax-only. */
2219 if (flag_syntax_only
)
2222 if (! dont_output_data
2223 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2225 error ("size of variable %q+D is too large", decl
);
2229 gcc_assert (MEM_P (decl_rtl
));
2230 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2231 symbol
= XEXP (decl_rtl
, 0);
2233 /* If this symbol belongs to the tree constant pool, output the constant
2234 if it hasn't already been written. */
2235 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2237 tree decl
= SYMBOL_REF_DECL (symbol
);
2238 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2239 output_constant_def_contents (symbol
);
2245 name
= XSTR (symbol
, 0);
2246 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2247 notice_global_symbol (decl
);
2249 /* Compute the alignment of this data. */
2251 align_variable (decl
, dont_output_data
);
2253 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2254 && asan_protect_global (decl
))
2256 asan_protected
= true;
2257 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
2258 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
2261 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2263 align
= get_variable_align (decl
);
2265 if (TREE_PUBLIC (decl
))
2266 maybe_assemble_visibility (decl
);
2268 if (DECL_PRESERVE_P (decl
))
2269 targetm
.asm_out
.mark_decl_preserved (name
);
2271 /* First make the assembler name(s) global if appropriate. */
2272 sect
= get_variable_section (decl
, false);
2273 if (TREE_PUBLIC (decl
)
2274 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2275 globalize_decl (decl
);
2277 /* Output any data that we will need to use the address of. */
2278 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2279 output_addressed_constants (DECL_INITIAL (decl
));
2281 /* dbxout.c needs to know this. */
2282 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2283 DECL_IN_TEXT_SECTION (decl
) = 1;
2285 /* If the decl is part of an object_block, make sure that the decl
2286 has been positioned within its block, but do not write out its
2287 definition yet. output_object_blocks will do that later. */
2288 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2290 gcc_assert (!dont_output_data
);
2291 place_block_symbol (symbol
);
2293 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2294 assemble_noswitch_variable (decl
, name
, sect
, align
);
2297 /* Special-case handling of vtv comdat sections. */
2298 if (sect
->named
.name
2299 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2300 handle_vtv_comdat_section (sect
, decl
);
2302 switch_to_section (sect
);
2303 if (align
> BITS_PER_UNIT
)
2304 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2305 assemble_variable_contents (decl
, name
, dont_output_data
);
2308 unsigned HOST_WIDE_INT
int size
2309 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2310 assemble_zeros (asan_red_zone_size (size
));
2316 /* Given a function declaration (FN_DECL), this function assembles the
2317 function into the .preinit_array section. */
2320 assemble_vtv_preinit_initializer (tree fn_decl
)
2323 unsigned flags
= SECTION_WRITE
;
2324 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2326 flags
|= SECTION_NOTYPE
;
2327 sect
= get_section (".preinit_array", flags
, fn_decl
);
2328 switch_to_section (sect
);
2329 assemble_addr_to_section (symbol
, sect
);
2332 /* Return 1 if type TYPE contains any pointers. */
2335 contains_pointers_p (tree type
)
2337 switch (TREE_CODE (type
))
2340 case REFERENCE_TYPE
:
2341 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2342 so I'll play safe and return 1. */
2348 case QUAL_UNION_TYPE
:
2351 /* For a type that has fields, see if the fields have pointers. */
2352 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2353 if (TREE_CODE (fields
) == FIELD_DECL
2354 && contains_pointers_p (TREE_TYPE (fields
)))
2360 /* An array type contains pointers if its element type does. */
2361 return contains_pointers_p (TREE_TYPE (type
));
2368 /* We delay assemble_external processing until
2369 the compilation unit is finalized. This is the best we can do for
2370 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2371 it all the way to final. See PR 17982 for further discussion. */
2372 static GTY(()) tree pending_assemble_externals
;
2374 #ifdef ASM_OUTPUT_EXTERNAL
2375 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2376 As a result, assemble_external can be called after the list of externals
2377 is processed and the pointer set destroyed. */
2378 static bool pending_assemble_externals_processed
;
2380 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2381 TREE_LIST in assemble_external. */
2382 static hash_set
<tree
> *pending_assemble_externals_set
;
2384 /* True if DECL is a function decl for which no out-of-line copy exists.
2385 It is assumed that DECL's assembler name has been set. */
2388 incorporeal_function_p (tree decl
)
2390 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2394 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2395 && ALLOCA_FUNCTION_CODE_P (DECL_FUNCTION_CODE (decl
)))
2398 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2399 /* Atomic or sync builtins which have survived this far will be
2400 resolved externally and therefore are not incorporeal. */
2401 if (strncmp (name
, "__builtin_", 10) == 0)
2407 /* Actually do the tests to determine if this is necessary, and invoke
2408 ASM_OUTPUT_EXTERNAL. */
2410 assemble_external_real (tree decl
)
2412 rtx rtl
= DECL_RTL (decl
);
2414 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2415 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2416 && !incorporeal_function_p (decl
))
2418 /* Some systems do require some output. */
2419 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2420 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2426 process_pending_assemble_externals (void)
2428 #ifdef ASM_OUTPUT_EXTERNAL
2430 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2431 assemble_external_real (TREE_VALUE (list
));
2433 pending_assemble_externals
= 0;
2434 pending_assemble_externals_processed
= true;
2435 delete pending_assemble_externals_set
;
2439 /* This TREE_LIST contains any weak symbol declarations waiting
2441 static GTY(()) tree weak_decls
;
2443 /* Output something to declare an external symbol to the assembler,
2444 and qualifiers such as weakness. (Most assemblers don't need
2445 extern declaration, so we normally output nothing.) Do nothing if
2446 DECL is not external. */
2449 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2451 /* Make sure that the ASM_OUT_FILE is open.
2452 If it's not, we should not be calling this function. */
2453 gcc_assert (asm_out_file
);
2455 /* In a perfect world, the following condition would be true.
2456 Sadly, the Go front end emit assembly *from the front end*,
2457 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2459 /* This function should only be called if we are expanding, or have
2461 Ideally, only final.c would be calling this function, but it is
2462 not clear whether that would break things somehow. See PR 17982
2463 for further discussion. */
2464 gcc_assert (state
== EXPANSION
2465 || state
== FINISHED
);
2468 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2471 /* We want to output annotation for weak and external symbols at
2472 very last to check if they are references or not. */
2474 if (TARGET_SUPPORTS_WEAK
2476 /* TREE_STATIC is a weird and abused creature which is not
2477 generally the right test for whether an entity has been
2478 locally emitted, inlined or otherwise not-really-extern, but
2479 for declarations that can be weak, it happens to be
2481 && !TREE_STATIC (decl
)
2482 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2483 && value_member (decl
, weak_decls
) == NULL_TREE
)
2484 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2486 #ifdef ASM_OUTPUT_EXTERNAL
2487 if (pending_assemble_externals_processed
)
2489 assemble_external_real (decl
);
2493 if (! pending_assemble_externals_set
->add (decl
))
2494 pending_assemble_externals
= tree_cons (NULL
, decl
,
2495 pending_assemble_externals
);
2499 /* Similar, for calling a library function FUN. */
2502 assemble_external_libcall (rtx fun
)
2504 /* Declare library function name external when first used, if nec. */
2505 if (! SYMBOL_REF_USED (fun
))
2507 SYMBOL_REF_USED (fun
) = 1;
2508 targetm
.asm_out
.external_libcall (fun
);
2512 /* Assemble a label named NAME. */
2515 assemble_label (FILE *file
, const char *name
)
2517 ASM_OUTPUT_LABEL (file
, name
);
2520 /* Set the symbol_referenced flag for ID. */
2522 mark_referenced (tree id
)
2524 TREE_SYMBOL_REFERENCED (id
) = 1;
2527 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2529 mark_decl_referenced (tree decl
)
2531 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2533 /* Extern inline functions don't become needed when referenced.
2534 If we know a method will be emitted in other TU and no new
2535 functions can be marked reachable, just use the external
2537 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2538 if (!DECL_EXTERNAL (decl
)
2539 && !node
->definition
)
2540 node
->mark_force_output ();
2542 else if (VAR_P (decl
))
2544 varpool_node
*node
= varpool_node::get_create (decl
);
2545 /* C++ frontend use mark_decl_references to force COMDAT variables
2546 to be output that might appear dead otherwise. */
2547 node
->force_output
= true;
2549 /* else do nothing - we can get various sorts of CST nodes here,
2550 which do not need to be marked. */
2554 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2555 starts with a *, the rest of NAME is output verbatim. Otherwise
2556 NAME is transformed in a target-specific way (usually by the
2557 addition of an underscore). */
2560 assemble_name_raw (FILE *file
, const char *name
)
2563 fputs (&name
[1], file
);
2565 ASM_OUTPUT_LABELREF (file
, name
);
2568 /* Like assemble_name_raw, but should be used when NAME might refer to
2569 an entity that is also represented as a tree (like a function or
2570 variable). If NAME does refer to such an entity, that entity will
2571 be marked as referenced. */
2574 assemble_name (FILE *file
, const char *name
)
2576 const char *real_name
;
2579 real_name
= targetm
.strip_name_encoding (name
);
2581 id
= maybe_get_identifier (real_name
);
2586 mark_referenced (id
);
2587 ultimate_transparent_alias_target (&id
);
2589 name
= IDENTIFIER_POINTER (id
);
2590 gcc_assert (! TREE_CHAIN (id
));
2593 assemble_name_raw (file
, name
);
2596 /* Allocate SIZE bytes writable static space with a gensym name
2597 and return an RTX to refer to its address. */
2600 assemble_static_space (unsigned HOST_WIDE_INT size
)
2603 const char *namestring
;
2606 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2608 namestring
= ggc_strdup (name
);
2610 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2611 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2613 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2614 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2617 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2618 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2621 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2622 so that each uninitialized object starts on such a boundary. */
2623 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2624 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2625 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2626 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2627 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2628 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2635 /* Assemble the static constant template for function entry trampolines.
2636 This is done at most once per compilation.
2637 Returns an RTX for the address of the template. */
2639 static GTY(()) rtx initial_trampoline
;
2642 assemble_trampoline_template (void)
2649 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2651 if (initial_trampoline
)
2652 return initial_trampoline
;
2654 /* By default, put trampoline templates in read-only data section. */
2656 #ifdef TRAMPOLINE_SECTION
2657 switch_to_section (TRAMPOLINE_SECTION
);
2659 switch_to_section (readonly_data_section
);
2662 /* Write the assembler code to define one. */
2663 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2665 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2667 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2668 targetm
.asm_out
.trampoline_template (asm_out_file
);
2670 /* Record the rtl to refer to it. */
2671 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2672 name
= ggc_strdup (label
);
2673 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2674 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2676 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2677 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2678 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2680 return initial_trampoline
;
2683 /* A and B are either alignments or offsets. Return the minimum alignment
2684 that may be assumed after adding the two together. */
2686 static inline unsigned
2687 min_align (unsigned int a
, unsigned int b
)
2689 return least_bit_hwi (a
| b
);
2692 /* Return the assembler directive for creating a given kind of integer
2693 object. SIZE is the number of bytes in the object and ALIGNED_P
2694 indicates whether it is known to be aligned. Return NULL if the
2695 assembly dialect has no such directive.
2697 The returned string should be printed at the start of a new line and
2698 be followed immediately by the object's initial value. */
2701 integer_asm_op (int size
, int aligned_p
)
2703 struct asm_int_op
*ops
;
2706 ops
= &targetm
.asm_out
.aligned_op
;
2708 ops
= &targetm
.asm_out
.unaligned_op
;
2713 return targetm
.asm_out
.byte_op
;
2727 /* Use directive OP to assemble an integer object X. Print OP at the
2728 start of the line, followed immediately by the value of X. */
2731 assemble_integer_with_op (const char *op
, rtx x
)
2733 fputs (op
, asm_out_file
);
2734 output_addr_const (asm_out_file
, x
);
2735 fputc ('\n', asm_out_file
);
2738 /* The default implementation of the asm_out.integer target hook. */
2741 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2742 unsigned int size ATTRIBUTE_UNUSED
,
2743 int aligned_p ATTRIBUTE_UNUSED
)
2745 const char *op
= integer_asm_op (size
, aligned_p
);
2746 /* Avoid GAS bugs for large values. Specifically negative values whose
2747 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2748 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2750 return op
&& (assemble_integer_with_op (op
, x
), true);
2753 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2754 the alignment of the integer in bits. Return 1 if we were able to output
2755 the constant, otherwise 0. We must be able to output the constant,
2756 if FORCE is nonzero. */
2759 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2763 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2765 /* See if the target hook can handle this kind of object. */
2766 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2769 /* If the object is a multi-byte one, try splitting it up. Split
2770 it into words it if is multi-word, otherwise split it into bytes. */
2773 machine_mode omode
, imode
;
2774 unsigned int subalign
;
2775 unsigned int subsize
, i
;
2776 enum mode_class mclass
;
2778 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2779 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2780 if (GET_CODE (x
) == CONST_FIXED
)
2781 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2785 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0).require ();
2786 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0).require ();
2788 for (i
= 0; i
< size
; i
+= subsize
)
2790 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2791 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2797 /* If we've printed some of it, but not all of it, there's no going
2802 gcc_assert (!force
);
2807 /* Assemble the floating-point constant D into an object of size MODE. ALIGN
2808 is the alignment of the constant in bits. If REVERSE is true, D is output
2809 in reverse storage order. */
2812 assemble_real (REAL_VALUE_TYPE d
, scalar_float_mode mode
, unsigned int align
,
2815 long data
[4] = {0, 0, 0, 0};
2816 int bitsize
, nelts
, nunits
, units_per
;
2819 /* This is hairy. We have a quantity of known size. real_to_target
2820 will put it into an array of *host* longs, 32 bits per element
2821 (even if long is more than 32 bits). We need to determine the
2822 number of array elements that are occupied (nelts) and the number
2823 of *target* min-addressable units that will be occupied in the
2824 object file (nunits). We cannot assume that 32 divides the
2825 mode's bitsize (size * BITS_PER_UNIT) evenly.
2827 size * BITS_PER_UNIT is used here to make sure that padding bits
2828 (which might appear at either end of the value; real_to_target
2829 will include the padding bits in its output array) are included. */
2831 nunits
= GET_MODE_SIZE (mode
);
2832 bitsize
= nunits
* BITS_PER_UNIT
;
2833 nelts
= CEIL (bitsize
, 32);
2834 units_per
= 32 / BITS_PER_UNIT
;
2836 real_to_target (data
, &d
, mode
);
2838 /* Put out the first word with the specified alignment. */
2840 elt
= flip_storage_order (SImode
, gen_int_mode (data
[nelts
- 1], SImode
));
2842 elt
= GEN_INT (data
[0]);
2843 assemble_integer (elt
, MIN (nunits
, units_per
), align
, 1);
2844 nunits
-= units_per
;
2846 /* Subsequent words need only 32-bit alignment. */
2847 align
= min_align (align
, 32);
2849 for (int i
= 1; i
< nelts
; i
++)
2852 elt
= flip_storage_order (SImode
,
2853 gen_int_mode (data
[nelts
- 1 - i
], SImode
));
2855 elt
= GEN_INT (data
[i
]);
2856 assemble_integer (elt
, MIN (nunits
, units_per
), align
, 1);
2857 nunits
-= units_per
;
2861 /* Given an expression EXP with a constant value,
2862 reduce it to the sum of an assembler symbol and an integer.
2863 Store them both in the structure *VALUE.
2864 EXP must be reducible. */
2872 decode_addr_const (tree exp
, struct addr_const
*value
)
2874 tree target
= TREE_OPERAND (exp
, 0);
2875 poly_int64 offset
= 0;
2881 if (TREE_CODE (target
) == COMPONENT_REF
2882 && poly_int_tree_p (byte_position (TREE_OPERAND (target
, 1)),
2886 target
= TREE_OPERAND (target
, 0);
2888 else if (TREE_CODE (target
) == ARRAY_REF
2889 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2891 /* Truncate big offset. */
2893 += (TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2894 * wi::to_poly_widest (TREE_OPERAND (target
, 1)).force_shwi ());
2895 target
= TREE_OPERAND (target
, 0);
2897 else if (TREE_CODE (target
) == MEM_REF
2898 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2900 offset
+= mem_ref_offset (target
).force_shwi ();
2901 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2903 else if (TREE_CODE (target
) == INDIRECT_REF
2904 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2905 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2907 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2912 switch (TREE_CODE (target
))
2916 x
= DECL_RTL (target
);
2920 x
= gen_rtx_MEM (FUNCTION_MODE
,
2921 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2930 x
= output_constant_def (target
, 1);
2934 /* This deals with absolute addresses. */
2935 offset
+= tree_to_shwi (TREE_OPERAND (target
, 0));
2936 x
= gen_rtx_MEM (QImode
,
2937 gen_rtx_SYMBOL_REF (Pmode
, "origin of addresses"));
2944 gcc_assert (MEM_P (x
));
2948 value
->offset
= offset
;
2951 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2953 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2955 /* Constant pool accessor function. */
2957 hash_table
<tree_descriptor_hasher
> *
2958 constant_pool_htab (void)
2960 return const_desc_htab
;
2963 /* Compute a hash code for a constant expression. */
2966 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2972 const_hash_1 (const tree exp
)
2977 enum tree_code code
= TREE_CODE (exp
);
2979 /* Either set P and LEN to the address and len of something to hash and
2980 exit the switch or return a value. */
2985 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2986 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2990 return real_hash (TREE_REAL_CST_PTR (exp
));
2993 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2996 p
= TREE_STRING_POINTER (exp
);
2997 len
= TREE_STRING_LENGTH (exp
);
3001 return (const_hash_1 (TREE_REALPART (exp
)) * 5
3002 + const_hash_1 (TREE_IMAGPART (exp
)));
3006 hi
= 7 + VECTOR_CST_NPATTERNS (exp
);
3007 hi
= hi
* 563 + VECTOR_CST_NELTS_PER_PATTERN (exp
);
3008 unsigned int count
= vector_cst_encoded_nelts (exp
);
3009 for (unsigned int i
= 0; i
< count
; ++i
)
3010 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ENCODED_ELT (exp
, i
));
3016 unsigned HOST_WIDE_INT idx
;
3019 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
3021 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
3023 hi
= hi
* 603 + const_hash_1 (value
);
3031 struct addr_const value
;
3033 decode_addr_const (exp
, &value
);
3034 switch (GET_CODE (value
.base
))
3037 /* Don't hash the address of the SYMBOL_REF;
3038 only use the offset and the symbol name. */
3039 hi
= value
.offset
.coeffs
[0];
3040 p
= XSTR (value
.base
, 0);
3041 for (i
= 0; p
[i
] != 0; i
++)
3042 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3046 hi
= (value
.offset
.coeffs
[0]
3047 + CODE_LABEL_NUMBER (label_ref_label (value
.base
)) * 13);
3057 case POINTER_PLUS_EXPR
:
3059 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3060 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3063 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3066 /* A language specific constant. Just hash the code. */
3070 /* Compute hashing function. */
3072 for (i
= 0; i
< len
; i
++)
3073 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3078 /* Wrapper of compare_constant, for the htab interface. */
3080 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3081 constant_descriptor_tree
*c2
)
3083 if (c1
->hash
!= c2
->hash
)
3085 return compare_constant (c1
->value
, c2
->value
);
3088 /* Compare t1 and t2, and return 1 only if they are known to result in
3089 the same bit pattern on output. */
3092 compare_constant (const tree t1
, const tree t2
)
3094 enum tree_code typecode
;
3096 if (t1
== NULL_TREE
)
3097 return t2
== NULL_TREE
;
3098 if (t2
== NULL_TREE
)
3101 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3104 switch (TREE_CODE (t1
))
3107 /* Integer constants are the same only if the same width of type. */
3108 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3110 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3112 return tree_int_cst_equal (t1
, t2
);
3115 /* Real constants are the same only if the same width of type. In
3116 addition to the same width, we need to check whether the modes are the
3117 same. There might be two floating point modes that are the same size
3118 but have different representations, such as the PowerPC that has 2
3119 different 128-bit floating point types (IBM extended double and IEEE
3120 128-bit floating point). */
3121 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3123 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3125 return real_identical (&TREE_REAL_CST (t1
), &TREE_REAL_CST (t2
));
3128 /* Fixed constants are the same only if the same width of type. */
3129 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3132 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3135 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3138 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3139 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3140 TREE_STRING_LENGTH (t1
)));
3143 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3144 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3148 if (VECTOR_CST_NPATTERNS (t1
)
3149 != VECTOR_CST_NPATTERNS (t2
))
3152 if (VECTOR_CST_NELTS_PER_PATTERN (t1
)
3153 != VECTOR_CST_NELTS_PER_PATTERN (t2
))
3156 unsigned int count
= vector_cst_encoded_nelts (t1
);
3157 for (unsigned int i
= 0; i
< count
; ++i
)
3158 if (!compare_constant (VECTOR_CST_ENCODED_ELT (t1
, i
),
3159 VECTOR_CST_ENCODED_ELT (t2
, i
)))
3167 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3168 unsigned HOST_WIDE_INT idx
;
3170 typecode
= TREE_CODE (TREE_TYPE (t1
));
3171 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3174 if (typecode
== ARRAY_TYPE
)
3176 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3177 /* For arrays, check that mode, size and storage order match. */
3178 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3180 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
))
3181 || TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t1
))
3182 != TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t2
)))
3187 /* For record and union constructors, require exact type
3189 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3193 v1
= CONSTRUCTOR_ELTS (t1
);
3194 v2
= CONSTRUCTOR_ELTS (t2
);
3195 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3198 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3200 constructor_elt
*c1
= &(*v1
)[idx
];
3201 constructor_elt
*c2
= &(*v2
)[idx
];
3203 /* Check that each value is the same... */
3204 if (!compare_constant (c1
->value
, c2
->value
))
3206 /* ... and that they apply to the same fields! */
3207 if (typecode
== ARRAY_TYPE
)
3209 if (!compare_constant (c1
->index
, c2
->index
))
3214 if (c1
->index
!= c2
->index
)
3225 struct addr_const value1
, value2
;
3229 decode_addr_const (t1
, &value1
);
3230 decode_addr_const (t2
, &value2
);
3232 if (maybe_ne (value1
.offset
, value2
.offset
))
3235 code
= GET_CODE (value1
.base
);
3236 if (code
!= GET_CODE (value2
.base
))
3242 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3246 ret
= (CODE_LABEL_NUMBER (label_ref_label (value1
.base
))
3247 == CODE_LABEL_NUMBER (label_ref_label (value2
.base
)));
3257 case POINTER_PLUS_EXPR
:
3260 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3261 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3264 case VIEW_CONVERT_EXPR
:
3265 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3274 /* Return the section into which constant EXP should be placed. */
3277 get_constant_section (tree exp
, unsigned int align
)
3279 return targetm
.asm_out
.select_section (exp
,
3280 compute_reloc_for_constant (exp
),
3284 /* Return the size of constant EXP in bytes. */
3286 static HOST_WIDE_INT
3287 get_constant_size (tree exp
)
3291 size
= int_size_in_bytes (TREE_TYPE (exp
));
3292 if (TREE_CODE (exp
) == STRING_CST
)
3293 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3297 /* Subroutine of output_constant_def:
3298 No constant equal to EXP is known to have been output.
3299 Make a constant descriptor to enter EXP in the hash table.
3300 Assign the label number and construct RTL to refer to the
3301 constant's location in memory.
3302 Caller is responsible for updating the hash table. */
3304 static struct constant_descriptor_tree
*
3305 build_constant_desc (tree exp
)
3307 struct constant_descriptor_tree
*desc
;
3313 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3316 /* Create a string containing the label name, in LABEL. */
3317 labelno
= const_labelno
++;
3318 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3320 /* Construct the VAR_DECL associated with the constant. */
3321 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3323 DECL_ARTIFICIAL (decl
) = 1;
3324 DECL_IGNORED_P (decl
) = 1;
3325 TREE_READONLY (decl
) = 1;
3326 TREE_STATIC (decl
) = 1;
3327 TREE_ADDRESSABLE (decl
) = 1;
3328 /* We don't set the RTL yet as this would cause varpool to assume that the
3329 variable is referenced. Moreover, it would just be dropped in LTO mode.
3330 Instead we set the flag that will be recognized in make_decl_rtl. */
3331 DECL_IN_CONSTANT_POOL (decl
) = 1;
3332 DECL_INITIAL (decl
) = desc
->value
;
3333 /* ??? targetm.constant_alignment hasn't been updated for vector types on
3334 most architectures so use DATA_ALIGNMENT as well, except for strings. */
3335 if (TREE_CODE (exp
) == STRING_CST
)
3336 SET_DECL_ALIGN (decl
, targetm
.constant_alignment (exp
, DECL_ALIGN (decl
)));
3338 align_variable (decl
, 0);
3340 /* Now construct the SYMBOL_REF and the MEM. */
3341 if (use_object_blocks_p ())
3343 int align
= (TREE_CODE (decl
) == CONST_DECL
3344 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3346 : symtab_node::get (decl
)->definition_alignment ());
3347 section
*sect
= get_constant_section (exp
, align
);
3348 symbol
= create_block_symbol (ggc_strdup (label
),
3349 get_block_for_section (sect
), -1);
3352 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3353 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3354 SET_SYMBOL_REF_DECL (symbol
, decl
);
3355 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3357 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3358 set_mem_attributes (rtl
, exp
, 1);
3359 set_mem_alias_set (rtl
, 0);
3361 /* Putting EXP into the literal pool might have imposed a different
3362 alignment which should be visible in the RTX as well. */
3363 set_mem_align (rtl
, DECL_ALIGN (decl
));
3365 /* We cannot share RTX'es in pool entries.
3366 Mark this piece of RTL as required for unsharing. */
3367 RTX_FLAG (rtl
, used
) = 1;
3369 /* Set flags or add text to the name to record information, such as
3370 that it is a local symbol. If the name is changed, the macro
3371 ASM_OUTPUT_LABELREF will have to know how to strip this
3372 information. This call might invalidate our local variable
3373 SYMBOL; we can't use it afterward. */
3374 targetm
.encode_section_info (exp
, rtl
, true);
3381 /* Return an rtx representing a reference to constant data in memory
3382 for the constant expression EXP.
3384 If assembler code for such a constant has already been output,
3385 return an rtx to refer to it.
3386 Otherwise, output such a constant in memory
3387 and generate an rtx for it.
3389 If DEFER is nonzero, this constant can be deferred and output only
3390 if referenced in the function after all optimizations.
3392 `const_desc_table' records which constants already have label strings. */
3395 output_constant_def (tree exp
, int defer
)
3397 struct constant_descriptor_tree
*desc
;
3398 struct constant_descriptor_tree key
;
3400 /* Look up EXP in the table of constant descriptors. If we didn't find
3401 it, create a new one. */
3403 key
.hash
= const_hash_1 (exp
);
3404 constant_descriptor_tree
**loc
3405 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3410 desc
= build_constant_desc (exp
);
3411 desc
->hash
= key
.hash
;
3415 maybe_output_constant_def_contents (desc
, defer
);
3419 /* Subroutine of output_constant_def: Decide whether or not we need to
3420 output the constant DESC now, and if so, do it. */
3422 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3425 rtx symbol
= XEXP (desc
->rtl
, 0);
3426 tree exp
= desc
->value
;
3428 if (flag_syntax_only
)
3431 if (TREE_ASM_WRITTEN (exp
))
3432 /* Already output; don't do it again. */
3435 /* We can always defer constants as long as the context allows
3439 /* Increment n_deferred_constants if it exists. It needs to be at
3440 least as large as the number of constants actually referred to
3441 by the function. If it's too small we'll stop looking too early
3442 and fail to emit constants; if it's too large we'll only look
3443 through the entire function when we could have stopped earlier. */
3445 n_deferred_constants
++;
3449 output_constant_def_contents (symbol
);
3452 /* Subroutine of output_constant_def_contents. Output the definition
3453 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3454 constant's alignment in bits. */
3457 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3461 size
= get_constant_size (exp
);
3463 /* Do any machine/system dependent processing of the constant. */
3464 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3466 /* Output the value of EXP. */
3467 output_constant (exp
, size
, align
, false);
3469 targetm
.asm_out
.decl_end ();
3472 /* We must output the constant data referred to by SYMBOL; do so. */
3475 output_constant_def_contents (rtx symbol
)
3477 tree decl
= SYMBOL_REF_DECL (symbol
);
3478 tree exp
= DECL_INITIAL (decl
);
3479 bool asan_protected
= false;
3481 /* Make sure any other constants whose addresses appear in EXP
3482 are assigned label numbers. */
3483 output_addressed_constants (exp
);
3485 /* We are no longer deferring this constant. */
3486 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3488 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3489 && TREE_CODE (exp
) == STRING_CST
3490 && asan_protect_global (exp
))
3492 asan_protected
= true;
3493 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
3494 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
3497 /* If the constant is part of an object block, make sure that the
3498 decl has been positioned within its block, but do not write out
3499 its definition yet. output_object_blocks will do that later. */
3500 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3501 place_block_symbol (symbol
);
3504 int align
= (TREE_CODE (decl
) == CONST_DECL
3505 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3507 : symtab_node::get (decl
)->definition_alignment ());
3508 switch_to_section (get_constant_section (exp
, align
));
3509 if (align
> BITS_PER_UNIT
)
3510 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3511 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3514 HOST_WIDE_INT size
= get_constant_size (exp
);
3515 assemble_zeros (asan_red_zone_size (size
));
3520 /* Look up EXP in the table of constant descriptors. Return the rtl
3521 if it has been emitted, else null. */
3524 lookup_constant_def (tree exp
)
3526 struct constant_descriptor_tree key
;
3529 key
.hash
= const_hash_1 (exp
);
3530 constant_descriptor_tree
*desc
3531 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3533 return (desc
? desc
->rtl
: NULL_RTX
);
3536 /* Return a tree representing a reference to constant data in memory
3537 for the constant expression EXP.
3539 This is the counterpart of output_constant_def at the Tree level. */
3542 tree_output_constant_def (tree exp
)
3544 struct constant_descriptor_tree
*desc
, key
;
3547 /* Look up EXP in the table of constant descriptors. If we didn't find
3548 it, create a new one. */
3550 key
.hash
= const_hash_1 (exp
);
3551 constant_descriptor_tree
**loc
3552 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3557 desc
= build_constant_desc (exp
);
3558 desc
->hash
= key
.hash
;
3562 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3563 varpool_node::finalize_decl (decl
);
3567 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3568 struct constant_descriptor_rtx
*next
;
3572 HOST_WIDE_INT offset
;
3574 fixed_size_mode mode
;
3580 struct const_rtx_desc_hasher
: ggc_ptr_hash
<constant_descriptor_rtx
>
3582 static hashval_t
hash (constant_descriptor_rtx
*);
3583 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3586 /* Used in the hash tables to avoid outputting the same constant
3587 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3588 are output once per function, not once per file. */
3589 /* ??? Only a few targets need per-function constant pools. Most
3590 can use one per-file pool. Should add a targetm bit to tell the
3593 struct GTY(()) rtx_constant_pool
{
3594 /* Pointers to first and last constant in pool, as ordered by offset. */
3595 struct constant_descriptor_rtx
*first
;
3596 struct constant_descriptor_rtx
*last
;
3598 /* Hash facility for making memory-constants from constant rtl-expressions.
3599 It is used on RISC machines where immediate integer arguments and
3600 constant addresses are restricted so that such constants must be stored
3602 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3604 /* Current offset in constant pool (does not include any
3605 machine-specific header). */
3606 HOST_WIDE_INT offset
;
3609 /* Hash and compare functions for const_rtx_htab. */
3612 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3618 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3619 constant_descriptor_rtx
*y
)
3621 if (x
->mode
!= y
->mode
)
3623 return rtx_equal_p (x
->constant
, y
->constant
);
3626 /* Hash one component of a constant. */
3629 const_rtx_hash_1 (const_rtx x
)
3631 unsigned HOST_WIDE_INT hwi
;
3637 code
= GET_CODE (x
);
3638 mode
= GET_MODE (x
);
3639 h
= (hashval_t
) code
* 1048573 + mode
;
3648 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3649 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3651 h
^= (hashval_t
) hwi
;
3652 for (i
= 1; i
< n
; ++i
)
3655 h
^= (hashval_t
) hwi
;
3660 case CONST_WIDE_INT
:
3663 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3664 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3669 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3671 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3675 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3679 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3683 h
^= htab_hash_string (XSTR (x
, 0));
3687 h
= h
* 251 + CODE_LABEL_NUMBER (label_ref_label (x
));
3691 case UNSPEC_VOLATILE
:
3692 h
= h
* 251 + XINT (x
, 1);
3702 /* Compute a hash value for X, which should be a constant. */
3705 const_rtx_hash (rtx x
)
3708 subrtx_iterator::array_type array
;
3709 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3710 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3715 /* Create and return a new rtx constant pool. */
3717 static struct rtx_constant_pool
*
3718 create_constant_pool (void)
3720 struct rtx_constant_pool
*pool
;
3722 pool
= ggc_alloc
<rtx_constant_pool
> ();
3723 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3730 /* Initialize constant pool hashing for a new function. */
3733 init_varasm_status (void)
3735 crtl
->varasm
.pool
= create_constant_pool ();
3736 crtl
->varasm
.deferred_constants
= 0;
3739 /* Given a MINUS expression, simplify it if both sides
3740 include the same symbol. */
3743 simplify_subtraction (rtx x
)
3745 rtx r
= simplify_rtx (x
);
3749 /* Given a constant rtx X, make (or find) a memory constant for its value
3750 and return a MEM rtx to refer to it in memory. IN_MODE is the mode
3754 force_const_mem (machine_mode in_mode
, rtx x
)
3756 struct constant_descriptor_rtx
*desc
, tmp
;
3757 struct rtx_constant_pool
*pool
;
3762 constant_descriptor_rtx
**slot
;
3763 fixed_size_mode mode
;
3765 /* We can't force variable-sized objects to memory. */
3766 if (!is_a
<fixed_size_mode
> (in_mode
, &mode
))
3769 /* If we're not allowed to drop X into the constant pool, don't. */
3770 if (targetm
.cannot_force_const_mem (mode
, x
))
3773 /* Record that this function has used a constant pool entry. */
3774 crtl
->uses_const_pool
= 1;
3776 /* Decide which pool to use. */
3777 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3778 ? shared_constant_pool
3779 : crtl
->varasm
.pool
);
3781 /* Lookup the value in the hashtable. */
3784 hash
= const_rtx_hash (x
);
3785 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3788 /* If the constant was already present, return its memory. */
3790 return copy_rtx (desc
->mem
);
3792 /* Otherwise, create a new descriptor. */
3793 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3796 /* Align the location counter as required by EXP's data type. */
3797 machine_mode align_mode
= (mode
== VOIDmode
? word_mode
: mode
);
3798 align
= targetm
.static_rtx_alignment (align_mode
);
3800 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3801 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3804 desc
->constant
= copy_rtx (tmp
.constant
);
3805 desc
->offset
= pool
->offset
;
3808 desc
->align
= align
;
3809 desc
->labelno
= const_labelno
;
3812 pool
->offset
+= GET_MODE_SIZE (mode
);
3814 pool
->last
->next
= desc
;
3816 pool
->first
= pool
->last
= desc
;
3819 /* Create a string containing the label name, in LABEL. */
3820 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3823 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3824 the constants pool. */
3825 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3827 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3828 symbol
= create_block_symbol (ggc_strdup (label
),
3829 get_block_for_section (sect
), -1);
3832 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3834 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3835 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3836 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3838 /* Construct the MEM. */
3839 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3840 set_mem_align (def
, align
);
3842 /* If we're dropping a label to the constant pool, make sure we
3844 if (GET_CODE (x
) == LABEL_REF
)
3845 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3847 return copy_rtx (def
);
3850 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3853 get_pool_constant (const_rtx addr
)
3855 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3858 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3859 and whether it has been output or not. */
3862 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3864 struct constant_descriptor_rtx
*desc
;
3866 desc
= SYMBOL_REF_CONSTANT (addr
);
3867 *pmarked
= (desc
->mark
!= 0);
3868 return desc
->constant
;
3871 /* Similar, return the mode. */
3874 get_pool_mode (const_rtx addr
)
3876 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3879 /* Return TRUE if and only if the constant pool has no entries. Note
3880 that even entries we might end up choosing not to emit are counted
3881 here, so there is the potential for missed optimizations. */
3884 constant_pool_empty_p (void)
3886 return crtl
->varasm
.pool
->first
== NULL
;
3889 /* Worker function for output_constant_pool_1. Emit assembly for X
3890 in MODE with known alignment ALIGN. */
3893 output_constant_pool_2 (fixed_size_mode mode
, rtx x
, unsigned int align
)
3895 switch (GET_MODE_CLASS (mode
))
3898 case MODE_DECIMAL_FLOAT
:
3900 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3901 assemble_real (*CONST_DOUBLE_REAL_VALUE (x
),
3902 as_a
<scalar_float_mode
> (mode
), align
, false);
3907 case MODE_PARTIAL_INT
:
3912 case MODE_POINTER_BOUNDS
:
3913 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3916 case MODE_VECTOR_BOOL
:
3918 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3920 /* Pick the smallest integer mode that contains at least one
3921 whole element. Often this is byte_mode and contains more
3922 than one element. */
3923 unsigned int nelts
= GET_MODE_NUNITS (mode
);
3924 unsigned int elt_bits
= GET_MODE_BITSIZE (mode
) / nelts
;
3925 unsigned int int_bits
= MAX (elt_bits
, BITS_PER_UNIT
);
3926 scalar_int_mode int_mode
= int_mode_for_size (int_bits
, 0).require ();
3928 /* Build the constant up one integer at a time. */
3929 unsigned int elts_per_int
= int_bits
/ elt_bits
;
3930 for (unsigned int i
= 0; i
< nelts
; i
+= elts_per_int
)
3932 unsigned HOST_WIDE_INT value
= 0;
3933 unsigned int limit
= MIN (nelts
- i
, elts_per_int
);
3934 for (unsigned int j
= 0; j
< limit
; ++j
)
3935 if (INTVAL (CONST_VECTOR_ELT (x
, i
+ j
)) != 0)
3936 value
|= 1 << (j
* elt_bits
);
3937 output_constant_pool_2 (int_mode
, gen_int_mode (value
, int_mode
),
3938 i
!= 0 ? MIN (align
, int_bits
) : align
);
3942 case MODE_VECTOR_FLOAT
:
3943 case MODE_VECTOR_INT
:
3944 case MODE_VECTOR_FRACT
:
3945 case MODE_VECTOR_UFRACT
:
3946 case MODE_VECTOR_ACCUM
:
3947 case MODE_VECTOR_UACCUM
:
3950 scalar_mode submode
= GET_MODE_INNER (mode
);
3951 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3953 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3954 units
= GET_MODE_NUNITS (mode
);
3956 for (i
= 0; i
< units
; i
++)
3958 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3959 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3969 /* Worker function for output_constant_pool. Emit constant DESC,
3970 giving it ALIGN bits of alignment. */
3973 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3980 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3981 whose CODE_LABEL has been deleted. This can occur if a jump table
3982 is eliminated by optimization. If so, write a constant of zero
3983 instead. Note that this can also happen by turning the
3984 CODE_LABEL into a NOTE. */
3985 /* ??? This seems completely and utterly wrong. Certainly it's
3986 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3987 functioning even with rtx_insn::deleted and friends. */
3990 switch (GET_CODE (tmp
))
3993 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3994 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3996 tmp
= XEXP (XEXP (tmp
, 0), 0);
4001 rtx_insn
*insn
= label_ref_label (tmp
);
4002 gcc_assert (!insn
->deleted ());
4003 gcc_assert (!NOTE_P (insn
)
4004 || NOTE_KIND (insn
) != NOTE_INSN_DELETED
);
4012 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
4013 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
4014 align
, desc
->labelno
, done
);
4017 assemble_align (align
);
4019 /* Output the label. */
4020 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
4023 Pass actual alignment value while emitting string constant to asm code
4024 as function 'output_constant_pool_1' explicitly passes the alignment as 1
4025 assuming that the data is already aligned which prevents the generation
4026 of fix-up table entries. */
4027 output_constant_pool_2 (desc
->mode
, x
, desc
->align
);
4029 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
4030 sections have proper size. */
4031 if (align
> GET_MODE_BITSIZE (desc
->mode
)
4033 && (in_section
->common
.flags
& SECTION_MERGE
))
4034 assemble_align (align
);
4036 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
4042 /* Recompute the offsets of entries in POOL, and the overall size of
4043 POOL. Do this after calling mark_constant_pool to ensure that we
4044 are computing the offset values for the pool which we will actually
4048 recompute_pool_offsets (struct rtx_constant_pool
*pool
)
4050 struct constant_descriptor_rtx
*desc
;
4053 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4056 /* Recalculate offset. */
4057 unsigned int align
= desc
->align
;
4058 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
4059 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
4060 desc
->offset
= pool
->offset
;
4061 pool
->offset
+= GET_MODE_SIZE (desc
->mode
);
4065 /* Mark all constants that are referenced by SYMBOL_REFs in X.
4066 Emit referenced deferred strings. */
4069 mark_constants_in_pattern (rtx insn
)
4071 subrtx_iterator::array_type array
;
4072 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
4074 const_rtx x
= *iter
;
4075 if (GET_CODE (x
) == SYMBOL_REF
)
4077 if (CONSTANT_POOL_ADDRESS_P (x
))
4079 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
4080 if (desc
->mark
== 0)
4083 iter
.substitute (desc
->constant
);
4086 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
4088 tree decl
= SYMBOL_REF_DECL (x
);
4089 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
4091 n_deferred_constants
--;
4092 output_constant_def_contents (CONST_CAST_RTX (x
));
4099 /* Look through appropriate parts of INSN, marking all entries in the
4100 constant pool which are actually being used. Entries that are only
4101 referenced by other constants are also marked as used. Emit
4102 deferred strings that are used. */
4105 mark_constants (rtx_insn
*insn
)
4110 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4111 insns, not any notes that may be attached. We don't want to mark
4112 a constant just because it happens to appear in a REG_EQUIV note. */
4113 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4115 int i
, n
= seq
->len ();
4116 for (i
= 0; i
< n
; ++i
)
4118 rtx subinsn
= seq
->element (i
);
4119 if (INSN_P (subinsn
))
4120 mark_constants_in_pattern (subinsn
);
4124 mark_constants_in_pattern (insn
);
4127 /* Look through the instructions for this function, and mark all the
4128 entries in POOL which are actually being used. Emit deferred constants
4129 which have indeed been used. */
4132 mark_constant_pool (void)
4136 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4139 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4140 mark_constants (insn
);
4143 /* Write all the constants in POOL. */
4146 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4148 struct constant_descriptor_rtx
*desc
;
4150 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4153 /* If the constant is part of an object_block, make sure that
4154 the constant has been positioned within its block, but do not
4155 write out its definition yet. output_object_blocks will do
4157 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4158 && SYMBOL_REF_BLOCK (desc
->sym
))
4159 place_block_symbol (desc
->sym
);
4162 switch_to_section (targetm
.asm_out
.select_rtx_section
4163 (desc
->mode
, desc
->constant
, desc
->align
));
4164 output_constant_pool_1 (desc
, desc
->align
);
4169 /* Mark all constants that are used in the current function, then write
4170 out the function's private constant pool. */
4173 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4174 tree fndecl ATTRIBUTE_UNUSED
)
4176 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4178 /* It is possible for gcc to call force_const_mem and then to later
4179 discard the instructions which refer to the constant. In such a
4180 case we do not need to output the constant. */
4181 mark_constant_pool ();
4183 /* Having marked the constant pool entries we'll actually emit, we
4184 now need to rebuild the offset information, which may have become
4186 recompute_pool_offsets (pool
);
4188 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4189 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4192 output_constant_pool_contents (pool
);
4194 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4195 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4199 /* Write the contents of the shared constant pool. */
4202 output_shared_constant_pool (void)
4204 output_constant_pool_contents (shared_constant_pool
);
4207 /* Determine what kind of relocations EXP may need. */
4210 compute_reloc_for_constant (tree exp
)
4212 int reloc
= 0, reloc2
;
4215 switch (TREE_CODE (exp
))
4219 /* Go inside any operations that get_inner_reference can handle and see
4220 if what's inside is a constant: no need to do anything here for
4221 addresses of variables or functions. */
4222 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4223 tem
= TREE_OPERAND (tem
, 0))
4226 if (TREE_CODE (tem
) == MEM_REF
4227 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4229 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4233 if (!targetm
.binds_local_p (tem
))
4240 case POINTER_PLUS_EXPR
:
4241 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4242 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4246 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4247 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4248 /* The difference of two local labels is computable at link time. */
4249 if (reloc
== 1 && reloc2
== 1)
4256 case VIEW_CONVERT_EXPR
:
4257 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4262 unsigned HOST_WIDE_INT idx
;
4263 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4265 reloc
|= compute_reloc_for_constant (tem
);
4275 /* Find all the constants whose addresses are referenced inside of EXP,
4276 and make sure assembler code with a label has been output for each one.
4277 Indicate whether an ADDR_EXPR has been encountered. */
4280 output_addressed_constants (tree exp
)
4284 switch (TREE_CODE (exp
))
4288 /* Go inside any operations that get_inner_reference can handle and see
4289 if what's inside is a constant: no need to do anything here for
4290 addresses of variables or functions. */
4291 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4292 tem
= TREE_OPERAND (tem
, 0))
4295 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4296 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4297 tem
= DECL_INITIAL (tem
);
4299 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4300 output_constant_def (tem
, 0);
4302 if (TREE_CODE (tem
) == MEM_REF
)
4303 output_addressed_constants (TREE_OPERAND (tem
, 0));
4307 case POINTER_PLUS_EXPR
:
4309 output_addressed_constants (TREE_OPERAND (exp
, 1));
4313 case VIEW_CONVERT_EXPR
:
4314 output_addressed_constants (TREE_OPERAND (exp
, 0));
4319 unsigned HOST_WIDE_INT idx
;
4320 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4322 output_addressed_constants (tem
);
4331 /* Whether a constructor CTOR is a valid static constant initializer if all
4332 its elements are. This used to be internal to initializer_constant_valid_p
4333 and has been exposed to let other functions like categorize_ctor_elements
4334 evaluate the property while walking a constructor for other purposes. */
4337 constructor_static_from_elts_p (const_tree ctor
)
4339 return (TREE_CONSTANT (ctor
)
4340 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4341 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4342 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4345 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4348 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4349 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4350 which are valid when ENDTYPE is an integer of any size; in
4351 particular, this does not accept a pointer minus a constant. This
4352 returns null_pointer_node if the VALUE is an absolute constant
4353 which can be used to initialize a static variable. Otherwise it
4357 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4361 if (!INTEGRAL_TYPE_P (endtype
))
4364 op0
= TREE_OPERAND (value
, 0);
4365 op1
= TREE_OPERAND (value
, 1);
4367 /* Like STRIP_NOPS except allow the operand mode to widen. This
4368 works around a feature of fold that simplifies (int)(p1 - p2) to
4369 ((int)p1 - (int)p2) under the theory that the narrower operation
4372 while (CONVERT_EXPR_P (op0
)
4373 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4375 tree inner
= TREE_OPERAND (op0
, 0);
4376 if (inner
== error_mark_node
4377 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4378 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op0
)))
4379 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4384 while (CONVERT_EXPR_P (op1
)
4385 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4387 tree inner
= TREE_OPERAND (op1
, 0);
4388 if (inner
== error_mark_node
4389 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4390 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op1
)))
4391 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4396 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4400 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4401 cache
? cache
+ 2 : NULL
);
4402 /* Both initializers must be known. */
4406 && (op0
== null_pointer_node
4407 || TREE_CODE (value
) == MINUS_EXPR
))
4408 return null_pointer_node
;
4410 /* Support differences between labels. */
4411 if (TREE_CODE (op0
) == LABEL_DECL
4412 && TREE_CODE (op1
) == LABEL_DECL
)
4413 return null_pointer_node
;
4415 if (TREE_CODE (op0
) == STRING_CST
4416 && TREE_CODE (op1
) == STRING_CST
4417 && operand_equal_p (op0
, op1
, 1))
4418 return null_pointer_node
;
4424 /* Helper function of initializer_constant_valid_p.
4425 Return nonzero if VALUE is a valid constant-valued expression
4426 for use in initializing a static variable; one that can be an
4427 element of a "constant" initializer.
4429 Return null_pointer_node if the value is absolute;
4430 if it is relocatable, return the variable that determines the relocation.
4431 We assume that VALUE has been folded as much as possible;
4432 therefore, we do not need to check for such things as
4433 arithmetic-combinations of integers.
4435 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4438 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4442 switch (TREE_CODE (value
))
4445 if (constructor_static_from_elts_p (value
))
4447 unsigned HOST_WIDE_INT idx
;
4449 bool absolute
= true;
4451 if (cache
&& cache
[0] == value
)
4453 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4456 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4459 /* An absolute value is required with reverse SSO. */
4460 || (reloc
!= null_pointer_node
4461 && TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (value
))
4462 && !AGGREGATE_TYPE_P (TREE_TYPE (elt
))))
4467 cache
[1] = NULL_TREE
;
4471 if (reloc
!= null_pointer_node
)
4474 /* For a non-absolute relocation, there is no single
4475 variable that can be "the variable that determines the
4480 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4482 return absolute
? null_pointer_node
: error_mark_node
;
4485 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4493 return null_pointer_node
;
4498 tree op0
= staticp (TREE_OPERAND (value
, 0));
4501 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4502 to be a constant, this is old-skool offsetof-like nonsense. */
4503 if (TREE_CODE (op0
) == INDIRECT_REF
4504 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4505 return null_pointer_node
;
4506 /* Taking the address of a nested function involves a trampoline,
4507 unless we don't need or want one. */
4508 if (TREE_CODE (op0
) == FUNCTION_DECL
4509 && DECL_STATIC_CHAIN (op0
)
4510 && !TREE_NO_TRAMPOLINE (value
))
4512 /* "&{...}" requires a temporary to hold the constructed
4514 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4520 case NON_LVALUE_EXPR
:
4521 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4524 case VIEW_CONVERT_EXPR
:
4526 tree src
= TREE_OPERAND (value
, 0);
4527 tree src_type
= TREE_TYPE (src
);
4528 tree dest_type
= TREE_TYPE (value
);
4530 /* Allow view-conversions from aggregate to non-aggregate type only
4531 if the bit pattern is fully preserved afterwards; otherwise, the
4532 RTL expander won't be able to apply a subsequent transformation
4533 to the underlying constructor. */
4534 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4536 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4537 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4542 /* Allow all other kinds of view-conversion. */
4543 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4548 tree src
= TREE_OPERAND (value
, 0);
4549 tree src_type
= TREE_TYPE (src
);
4550 tree dest_type
= TREE_TYPE (value
);
4552 /* Allow conversions between pointer types, floating-point
4553 types, and offset types. */
4554 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4555 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4556 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4557 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4558 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4560 /* Allow length-preserving conversions between integer types. */
4561 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4562 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4563 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4565 /* Allow conversions between other integer types only if
4566 explicit value. Don't allow sign-extension to a type larger
4567 than word and pointer, there aren't relocations that would
4568 allow to sign extend it to a wider type. */
4569 if (INTEGRAL_TYPE_P (dest_type
)
4570 && INTEGRAL_TYPE_P (src_type
)
4571 && (TYPE_UNSIGNED (src_type
)
4572 || TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
)
4573 || TYPE_PRECISION (dest_type
) <= BITS_PER_WORD
4574 || TYPE_PRECISION (dest_type
) <= POINTER_SIZE
))
4576 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4577 if (inner
== null_pointer_node
)
4578 return null_pointer_node
;
4582 /* Allow (int) &foo provided int is as wide as a pointer. */
4583 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4584 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4585 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4587 /* Likewise conversions from int to pointers, but also allow
4588 conversions from 0. */
4589 if ((POINTER_TYPE_P (dest_type
)
4590 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4591 && INTEGRAL_TYPE_P (src_type
))
4593 if (TREE_CODE (src
) == INTEGER_CST
4594 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4595 return null_pointer_node
;
4596 if (integer_zerop (src
))
4597 return null_pointer_node
;
4598 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4599 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4602 /* Allow conversions to struct or union types if the value
4604 if (TREE_CODE (dest_type
) == RECORD_TYPE
4605 || TREE_CODE (dest_type
) == UNION_TYPE
)
4606 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4610 case POINTER_PLUS_EXPR
:
4612 /* Any valid floating-point constants will have been folded by now;
4613 with -frounding-math we hit this with addition of two constants. */
4614 if (TREE_CODE (endtype
) == REAL_TYPE
)
4616 if (cache
&& cache
[0] == value
)
4618 if (! INTEGRAL_TYPE_P (endtype
)
4619 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4621 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4623 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4626 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4627 endtype
, ncache
+ 2);
4628 /* If either term is absolute, use the other term's relocation. */
4629 if (valid0
== null_pointer_node
)
4631 else if (valid1
== null_pointer_node
)
4633 /* Support narrowing pointer differences. */
4635 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4639 /* Support narrowing pointer differences. */
4640 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4648 case POINTER_DIFF_EXPR
:
4650 if (TREE_CODE (endtype
) == REAL_TYPE
)
4652 if (cache
&& cache
[0] == value
)
4654 if (! INTEGRAL_TYPE_P (endtype
)
4655 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4657 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4659 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4662 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4663 endtype
, ncache
+ 2);
4664 /* Win if second argument is absolute. */
4665 if (valid1
== null_pointer_node
)
4667 /* Win if both arguments have the same relocation.
4668 Then the value is absolute. */
4669 else if (valid0
== valid1
&& valid0
!= 0)
4670 ret
= null_pointer_node
;
4671 /* Since GCC guarantees that string constants are unique in the
4672 generated code, a subtraction between two copies of the same
4673 constant string is absolute. */
4674 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4675 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4676 && operand_equal_p (valid0
, valid1
, 1))
4677 ret
= null_pointer_node
;
4678 /* Support narrowing differences. */
4680 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4684 /* Support narrowing differences. */
4685 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4700 /* Return nonzero if VALUE is a valid constant-valued expression
4701 for use in initializing a static variable; one that can be an
4702 element of a "constant" initializer.
4704 Return null_pointer_node if the value is absolute;
4705 if it is relocatable, return the variable that determines the relocation.
4706 We assume that VALUE has been folded as much as possible;
4707 therefore, we do not need to check for such things as
4708 arithmetic-combinations of integers. */
4710 initializer_constant_valid_p (tree value
, tree endtype
, bool reverse
)
4712 tree reloc
= initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4714 /* An absolute value is required with reverse storage order. */
4716 && reloc
!= null_pointer_node
4718 && !AGGREGATE_TYPE_P (endtype
)
4719 && !VECTOR_TYPE_P (endtype
))
4725 /* Return true if VALUE is a valid constant-valued expression
4726 for use in initializing a static bit-field; one that can be
4727 an element of a "constant" initializer. */
4730 initializer_constant_valid_for_bitfield_p (tree value
)
4732 /* For bitfields we support integer constants or possibly nested aggregates
4734 switch (TREE_CODE (value
))
4738 unsigned HOST_WIDE_INT idx
;
4741 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4742 if (!initializer_constant_valid_for_bitfield_p (elt
))
4751 case VIEW_CONVERT_EXPR
:
4752 case NON_LVALUE_EXPR
:
4754 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4763 /* output_constructor outer state of relevance in recursive calls, typically
4764 for nested aggregate bitfields. */
4766 struct oc_outer_state
{
4767 unsigned int bit_offset
; /* current position in ... */
4768 int byte
; /* ... the outer byte buffer. */
4771 static unsigned HOST_WIDE_INT
4772 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int, bool,
4775 /* Output assembler code for constant EXP, with no label.
4776 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4777 Assumes output_addressed_constants has been done on EXP already.
4779 Generate at least SIZE bytes of assembler data, padding at the end
4780 with zeros if necessary. SIZE must always be specified. The returned
4781 value is the actual number of bytes of assembler data generated, which
4782 may be bigger than SIZE if the object contains a variable length field.
4784 SIZE is important for structure constructors,
4785 since trailing members may have been omitted from the constructor.
4786 It is also important for initialization of arrays from string constants
4787 since the full length of the string constant might not be wanted.
4788 It is also needed for initialization of unions, where the initializer's
4789 type is just one member, and that may not be as long as the union.
4791 There a case in which we would fail to output exactly SIZE bytes:
4792 for a structure constructor that wants to produce more than SIZE bytes.
4793 But such constructors will never be generated for any possible input.
4795 ALIGN is the alignment of the data in bits.
4797 If REVERSE is true, EXP is output in reverse storage order. */
4799 static unsigned HOST_WIDE_INT
4800 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
4803 enum tree_code code
;
4804 unsigned HOST_WIDE_INT thissize
;
4807 if (size
== 0 || flag_syntax_only
)
4810 /* See if we're trying to initialize a pointer in a non-default mode
4811 to the address of some declaration somewhere. If the target says
4812 the mode is valid for pointers, assume the target has a way of
4814 if (TREE_CODE (exp
) == NOP_EXPR
4815 && POINTER_TYPE_P (TREE_TYPE (exp
))
4816 && targetm
.addr_space
.valid_pointer_mode
4817 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
4818 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4820 tree saved_type
= TREE_TYPE (exp
);
4822 /* Peel off any intermediate conversions-to-pointer for valid
4824 while (TREE_CODE (exp
) == NOP_EXPR
4825 && POINTER_TYPE_P (TREE_TYPE (exp
))
4826 && targetm
.addr_space
.valid_pointer_mode
4827 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
4828 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4829 exp
= TREE_OPERAND (exp
, 0);
4831 /* If what we're left with is the address of something, we can
4832 convert the address to the final type and output it that
4834 if (TREE_CODE (exp
) == ADDR_EXPR
)
4835 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4836 /* Likewise for constant ints. */
4837 else if (TREE_CODE (exp
) == INTEGER_CST
)
4838 exp
= fold_convert (saved_type
, exp
);
4842 /* Eliminate any conversions since we'll be outputting the underlying
4844 while (CONVERT_EXPR_P (exp
)
4845 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4846 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4848 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4849 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4851 /* Make sure eliminating the conversion is really a no-op, except with
4852 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4853 union types to allow for Ada unchecked unions. */
4854 if (type_size
> op_size
4855 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4856 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4857 /* Keep the conversion. */
4860 exp
= TREE_OPERAND (exp
, 0);
4863 code
= TREE_CODE (TREE_TYPE (exp
));
4864 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4866 /* Allow a constructor with no elements for any data type.
4867 This means to fill the space with zeros. */
4868 if (TREE_CODE (exp
) == CONSTRUCTOR
4869 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4871 assemble_zeros (size
);
4875 if (TREE_CODE (exp
) == FDESC_EXPR
)
4877 #ifdef ASM_OUTPUT_FDESC
4878 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4879 tree decl
= TREE_OPERAND (exp
, 0);
4880 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4887 /* Now output the underlying data. If we've handling the padding, return.
4888 Otherwise, break and ensure SIZE is the size written. */
4895 case REFERENCE_TYPE
:
4897 case FIXED_POINT_TYPE
:
4898 case POINTER_BOUNDS_TYPE
:
4900 cst
= expand_expr (exp
, NULL_RTX
, VOIDmode
, EXPAND_INITIALIZER
);
4902 cst
= flip_storage_order (TYPE_MODE (TREE_TYPE (exp
)), cst
);
4903 if (!assemble_integer (cst
, MIN (size
, thissize
), align
, 0))
4904 error ("initializer for integer/fixed-point value is too complicated");
4908 if (TREE_CODE (exp
) != REAL_CST
)
4909 error ("initializer for floating value is not a floating constant");
4911 assemble_real (TREE_REAL_CST (exp
),
4912 SCALAR_FLOAT_TYPE_MODE (TREE_TYPE (exp
)),
4917 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
, reverse
);
4918 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4919 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)),
4925 switch (TREE_CODE (exp
))
4928 return output_constructor (exp
, size
, align
, reverse
, NULL
);
4931 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4932 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4936 scalar_mode inner
= SCALAR_TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4937 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4938 int elt_size
= GET_MODE_SIZE (inner
);
4939 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
,
4941 thissize
= elt_size
;
4942 /* Static constants must have a fixed size. */
4943 unsigned int nunits
= VECTOR_CST_NELTS (exp
).to_constant ();
4944 for (unsigned int i
= 1; i
< nunits
; i
++)
4946 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
,
4948 thissize
+= elt_size
;
4959 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4960 return output_constructor (exp
, size
, align
, reverse
, NULL
);
4969 if (size
> thissize
)
4970 assemble_zeros (size
- thissize
);
4975 /* Subroutine of output_constructor, used for computing the size of
4976 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4977 type with an unspecified upper bound. */
4979 static unsigned HOST_WIDE_INT
4980 array_size_for_constructor (tree val
)
4983 unsigned HOST_WIDE_INT cnt
;
4984 tree index
, value
, tmp
;
4987 /* This code used to attempt to handle string constants that are not
4988 arrays of single-bytes, but nothing else does, so there's no point in
4990 if (TREE_CODE (val
) == STRING_CST
)
4991 return TREE_STRING_LENGTH (val
);
4993 max_index
= NULL_TREE
;
4994 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4996 if (TREE_CODE (index
) == RANGE_EXPR
)
4997 index
= TREE_OPERAND (index
, 1);
4998 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
5002 if (max_index
== NULL_TREE
)
5005 /* Compute the total number of array elements. */
5006 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
5007 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
5009 /* Multiply by the array element unit size to find number of bytes. */
5010 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
5012 gcc_assert (wi::fits_uhwi_p (i
));
5013 return i
.to_uhwi ();
5016 /* Other datastructures + helpers for output_constructor. */
5018 /* output_constructor local state to support interaction with helpers. */
5020 struct oc_local_state
{
5022 /* Received arguments. */
5023 tree exp
; /* Constructor expression. */
5024 tree type
; /* Type of constructor expression. */
5025 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
5026 unsigned int align
; /* Known initial alignment. */
5027 tree min_index
; /* Lower bound if specified for an array. */
5029 /* Output processing state. */
5030 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
5031 int byte
; /* Part of a bitfield byte yet to be output. */
5032 int last_relative_index
; /* Implicit or explicit index of the last
5033 array element output within a bitfield. */
5034 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
5035 bool reverse
; /* Whether reverse storage order is in use. */
5037 /* Current element. */
5038 tree field
; /* Current field decl in a record. */
5039 tree val
; /* Current element value. */
5040 tree index
; /* Current element index. */
5044 /* Helper for output_constructor. From the current LOCAL state, output a
5045 RANGE_EXPR element. */
5048 output_constructor_array_range (oc_local_state
*local
)
5050 unsigned HOST_WIDE_INT fieldsize
5051 = int_size_in_bytes (TREE_TYPE (local
->type
));
5053 HOST_WIDE_INT lo_index
5054 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
5055 HOST_WIDE_INT hi_index
5056 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
5057 HOST_WIDE_INT index
;
5060 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
5062 for (index
= lo_index
; index
<= hi_index
; index
++)
5064 /* Output the element's initial value. */
5065 if (local
->val
== NULL_TREE
)
5066 assemble_zeros (fieldsize
);
5069 = output_constant (local
->val
, fieldsize
, align2
, local
->reverse
);
5071 /* Count its size. */
5072 local
->total_bytes
+= fieldsize
;
5076 /* Helper for output_constructor. From the current LOCAL state, output a
5077 field element that is not true bitfield or part of an outer one. */
5080 output_constructor_regular_field (oc_local_state
*local
)
5082 /* Field size and position. Since this structure is static, we know the
5083 positions are constant. */
5084 unsigned HOST_WIDE_INT fieldsize
;
5085 HOST_WIDE_INT fieldpos
;
5087 unsigned int align2
;
5089 /* Output any buffered-up bit-fields preceding this element. */
5090 if (local
->byte_buffer_in_use
)
5092 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5093 local
->total_bytes
++;
5094 local
->byte_buffer_in_use
= false;
5097 if (local
->index
!= NULL_TREE
)
5099 /* Perform the index calculation in modulo arithmetic but
5100 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
5101 but we are using an unsigned sizetype. */
5102 unsigned prec
= TYPE_PRECISION (sizetype
);
5103 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
5104 - wi::to_offset (local
->min_index
), prec
);
5105 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
5108 else if (local
->field
!= NULL_TREE
)
5109 fieldpos
= int_byte_position (local
->field
);
5113 /* Advance to offset of this element.
5114 Note no alignment needed in an array, since that is guaranteed
5115 if each element has the proper size. */
5116 if (local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
5118 if (fieldpos
> local
->total_bytes
)
5120 assemble_zeros (fieldpos
- local
->total_bytes
);
5121 local
->total_bytes
= fieldpos
;
5124 /* Must not go backwards. */
5125 gcc_assert (fieldpos
== local
->total_bytes
);
5128 /* Find the alignment of this element. */
5129 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
5131 /* Determine size this element should occupy. */
5136 /* If this is an array with an unspecified upper bound,
5137 the initializer determines the size. */
5138 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5139 but we cannot do this until the deprecated support for
5140 initializing zero-length array members is removed. */
5141 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
5142 && (!TYPE_DOMAIN (TREE_TYPE (local
->field
))
5143 || !TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
)))))
5145 fieldsize
= array_size_for_constructor (local
->val
);
5146 /* Given a non-empty initialization, this field had better
5147 be last. Given a flexible array member, the next field
5148 on the chain is a TYPE_DECL of the enclosing struct. */
5149 const_tree next
= DECL_CHAIN (local
->field
);
5150 gcc_assert (!fieldsize
|| !next
|| TREE_CODE (next
) != FIELD_DECL
);
5153 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5156 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5158 /* Output the element's initial value. */
5159 if (local
->val
== NULL_TREE
)
5160 assemble_zeros (fieldsize
);
5163 = output_constant (local
->val
, fieldsize
, align2
, local
->reverse
);
5165 /* Count its size. */
5166 local
->total_bytes
+= fieldsize
;
5169 /* Helper for output_constructor. From the LOCAL state, output an element
5170 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5171 from the start of a possibly ongoing outer byte buffer. */
5174 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5176 /* Bit size of this element. */
5177 HOST_WIDE_INT ebitsize
5179 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5180 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5182 /* Relative index of this element if this is an array component. */
5183 HOST_WIDE_INT relative_index
5186 ? (tree_to_shwi (local
->index
)
5187 - tree_to_shwi (local
->min_index
))
5188 : local
->last_relative_index
+ 1)
5191 /* Bit position of this element from the start of the containing
5193 HOST_WIDE_INT constructor_relative_ebitpos
5195 ? int_bit_position (local
->field
)
5196 : ebitsize
* relative_index
);
5198 /* Bit position of this element from the start of a possibly ongoing
5199 outer byte buffer. */
5200 HOST_WIDE_INT byte_relative_ebitpos
5201 = bit_offset
+ constructor_relative_ebitpos
;
5203 /* From the start of a possibly ongoing outer byte buffer, offsets to
5204 the first bit of this element and to the first bit past the end of
5206 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5207 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5209 local
->last_relative_index
= relative_index
;
5211 if (local
->val
== NULL_TREE
)
5212 local
->val
= integer_zero_node
;
5214 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5215 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5216 local
->val
= TREE_OPERAND (local
->val
, 0);
5218 if (TREE_CODE (local
->val
) != INTEGER_CST
5219 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5221 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5225 /* If this field does not start in this (or next) byte, skip some bytes. */
5226 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5228 /* Output remnant of any bit field in previous bytes. */
5229 if (local
->byte_buffer_in_use
)
5231 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5232 local
->total_bytes
++;
5233 local
->byte_buffer_in_use
= false;
5236 /* If still not at proper byte, advance to there. */
5237 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5239 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5240 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5241 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5245 /* Set up the buffer if necessary. */
5246 if (!local
->byte_buffer_in_use
)
5250 local
->byte_buffer_in_use
= true;
5253 /* If this is nested constructor, recurse passing the bit offset and the
5254 pending data, then retrieve the new pending data afterwards. */
5255 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5257 oc_outer_state temp_state
;
5258 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5259 temp_state
.byte
= local
->byte
;
5261 += output_constructor (local
->val
, 0, 0, local
->reverse
, &temp_state
);
5262 local
->byte
= temp_state
.byte
;
5266 /* Otherwise, we must split the element into pieces that fall within
5267 separate bytes, and combine each byte with previous or following
5269 while (next_offset
< end_offset
)
5273 HOST_WIDE_INT value
;
5274 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5275 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5277 /* Advance from byte to byte within this element when necessary. */
5278 while (next_byte
!= local
->total_bytes
)
5280 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5281 local
->total_bytes
++;
5285 /* Number of bits we can process at once (all part of the same byte). */
5286 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5287 if (local
->reverse
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
5289 /* For big-endian data, take the most significant bits (of the
5290 bits that are significant) first and put them into bytes from
5291 the most significant end. */
5292 shift
= end_offset
- next_offset
- this_time
;
5294 /* Don't try to take a bunch of bits that cross
5295 the word boundary in the INTEGER_CST. We can
5296 only select bits from one element. */
5297 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5298 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5300 const int end
= shift
+ this_time
- 1;
5301 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5302 this_time
= end
- shift
+ 1;
5305 /* Now get the bits from the appropriate constant word. */
5306 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5307 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5309 /* Get the result. This works only when:
5310 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5311 local
->byte
|= (((value
>> shift
)
5312 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5313 << (BITS_PER_UNIT
- this_time
- next_bit
));
5317 /* On little-endian machines, take the least significant bits of
5318 the value first and pack them starting at the least significant
5319 bits of the bytes. */
5320 shift
= next_offset
- byte_relative_ebitpos
;
5322 /* Don't try to take a bunch of bits that cross
5323 the word boundary in the INTEGER_CST. We can
5324 only select bits from one element. */
5325 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5326 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5328 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5330 /* Now get the bits from the appropriate constant word. */
5331 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5332 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5334 /* Get the result. This works only when:
5335 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5336 local
->byte
|= (((value
>> shift
)
5337 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5341 next_offset
+= this_time
;
5342 local
->byte_buffer_in_use
= true;
5346 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5347 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5348 caller output state of relevance in recursive invocations. */
5350 static unsigned HOST_WIDE_INT
5351 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
5352 bool reverse
, oc_outer_state
*outer
)
5354 unsigned HOST_WIDE_INT cnt
;
5355 constructor_elt
*ce
;
5356 oc_local_state local
;
5358 /* Setup our local state to communicate with helpers. */
5360 local
.type
= TREE_TYPE (exp
);
5362 local
.align
= align
;
5363 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5364 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5366 local
.min_index
= integer_zero_node
;
5368 local
.total_bytes
= 0;
5369 local
.byte_buffer_in_use
= outer
!= NULL
;
5370 local
.byte
= outer
? outer
->byte
: 0;
5371 local
.last_relative_index
= -1;
5372 /* The storage order is specified for every aggregate type. */
5373 if (AGGREGATE_TYPE_P (local
.type
))
5374 local
.reverse
= TYPE_REVERSE_STORAGE_ORDER (local
.type
);
5376 local
.reverse
= reverse
;
5378 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5380 /* As CE goes through the elements of the constant, FIELD goes through the
5381 structure fields if the constant is a structure. If the constant is a
5382 union, we override this by getting the field from the TREE_LIST element.
5383 But the constant could also be an array. Then FIELD is zero.
5385 There is always a maximum of one element in the chain LINK for unions
5386 (even if the initializer in a source program incorrectly contains
5389 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5390 local
.field
= TYPE_FIELDS (local
.type
);
5392 local
.field
= NULL_TREE
;
5395 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5396 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5398 local
.val
= ce
->value
;
5399 local
.index
= NULL_TREE
;
5401 /* The element in a union constructor specifies the proper field
5403 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5404 local
.field
= ce
->index
;
5406 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5407 local
.index
= ce
->index
;
5409 if (local
.field
&& flag_verbose_asm
)
5410 fprintf (asm_out_file
, "%s %s:\n",
5412 DECL_NAME (local
.field
)
5413 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5416 /* Eliminate the marker that makes a cast not be an lvalue. */
5417 if (local
.val
!= NULL_TREE
)
5418 STRIP_NOPS (local
.val
);
5420 /* Output the current element, using the appropriate helper ... */
5422 /* For an array slice not part of an outer bitfield. */
5424 && local
.index
!= NULL_TREE
5425 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5426 output_constructor_array_range (&local
);
5428 /* For a field that is neither a true bitfield nor part of an outer one,
5429 known to be at least byte aligned and multiple-of-bytes long. */
5431 && (local
.field
== NULL_TREE
5432 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5433 output_constructor_regular_field (&local
);
5435 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5436 supported for scalar fields, so we may need to convert first. */
5439 if (TREE_CODE (local
.val
) == REAL_CST
)
5441 = fold_unary (VIEW_CONVERT_EXPR
,
5442 build_nonstandard_integer_type
5443 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5445 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5449 /* If we are not at toplevel, save the pending data for our caller.
5450 Otherwise output the pending data and padding zeros as needed. */
5452 outer
->byte
= local
.byte
;
5455 if (local
.byte_buffer_in_use
)
5457 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5458 local
.total_bytes
++;
5461 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5463 assemble_zeros (local
.size
- local
.total_bytes
);
5464 local
.total_bytes
= local
.size
;
5468 return local
.total_bytes
;
5471 /* Mark DECL as weak. */
5474 mark_weak (tree decl
)
5476 if (DECL_WEAK (decl
))
5479 struct symtab_node
*n
= symtab_node::get (decl
);
5480 if (n
&& n
->refuse_visibility_changes
)
5481 error ("%+qD declared weak after being used", decl
);
5482 DECL_WEAK (decl
) = 1;
5484 if (DECL_RTL_SET_P (decl
)
5485 && MEM_P (DECL_RTL (decl
))
5486 && XEXP (DECL_RTL (decl
), 0)
5487 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5488 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5491 /* Merge weak status between NEWDECL and OLDDECL. */
5494 merge_weak (tree newdecl
, tree olddecl
)
5496 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5498 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5501 /* We put the NEWDECL on the weak_decls list at some point
5502 and OLDDECL as well. Keep just OLDDECL on the list. */
5503 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5504 if (TREE_VALUE (*pwd
) == newdecl
)
5506 *pwd
= TREE_CHAIN (*pwd
);
5513 if (DECL_WEAK (newdecl
))
5517 /* NEWDECL is weak, but OLDDECL is not. */
5519 /* If we already output the OLDDECL, we're in trouble; we can't
5520 go back and make it weak. This should never happen in
5521 unit-at-a-time compilation. */
5522 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5524 /* If we've already generated rtl referencing OLDDECL, we may
5525 have done so in a way that will not function properly with
5526 a weak symbol. Again in unit-at-a-time this should be
5528 gcc_assert (!TREE_USED (olddecl
)
5529 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5531 /* PR 49899: You cannot convert a static function into a weak, public function. */
5532 if (! TREE_PUBLIC (olddecl
) && TREE_PUBLIC (newdecl
))
5533 error ("weak declaration of %q+D being applied to a already "
5534 "existing, static definition", newdecl
);
5536 if (TARGET_SUPPORTS_WEAK
)
5538 /* We put the NEWDECL on the weak_decls list at some point.
5539 Replace it with the OLDDECL. */
5540 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5541 if (TREE_VALUE (wd
) == newdecl
)
5543 TREE_VALUE (wd
) = olddecl
;
5546 /* We may not find the entry on the list. If NEWDECL is a
5547 weak alias, then we will have already called
5548 globalize_decl to remove the entry; in that case, we do
5549 not need to do anything. */
5552 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5553 mark_weak (olddecl
);
5556 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5557 weak. Just update NEWDECL to indicate that it's weak too. */
5558 mark_weak (newdecl
);
5561 /* Declare DECL to be a weak symbol. */
5564 declare_weak (tree decl
)
5566 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5567 if (! TREE_PUBLIC (decl
))
5569 error ("weak declaration of %q+D must be public", decl
);
5572 else if (!TARGET_SUPPORTS_WEAK
)
5573 warning (0, "weak declaration of %q+D not supported", decl
);
5576 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5577 DECL_ATTRIBUTES (decl
)
5578 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5582 weak_finish_1 (tree decl
)
5584 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5585 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5588 if (! TREE_USED (decl
))
5591 #ifdef ASM_WEAKEN_DECL
5592 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5594 #ifdef ASM_WEAKEN_LABEL
5595 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5597 #ifdef ASM_OUTPUT_WEAK_ALIAS
5599 static bool warn_once
= 0;
5602 warning (0, "only weak aliases are supported in this configuration");
5612 /* Fiven an assembly name, find the decl it is associated with. */
5614 find_decl (tree target
)
5616 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5622 /* This TREE_LIST contains weakref targets. */
5624 static GTY(()) tree weakref_targets
;
5626 /* Emit any pending weak declarations. */
5633 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5635 tree alias_decl
= TREE_PURPOSE (t
);
5636 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5638 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5639 /* Remove alias_decl from the weak list, but leave entries for
5640 the target alone. */
5642 #ifndef ASM_OUTPUT_WEAKREF
5643 else if (! TREE_SYMBOL_REFERENCED (target
))
5645 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5646 defined, otherwise we and weak_finish_1 would use
5647 different macros. */
5648 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5649 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5651 tree decl
= find_decl (target
);
5655 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5656 TREE_CODE (alias_decl
), target
,
5657 TREE_TYPE (alias_decl
));
5659 DECL_EXTERNAL (decl
) = 1;
5660 TREE_PUBLIC (decl
) = 1;
5661 DECL_ARTIFICIAL (decl
) = 1;
5662 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5663 TREE_USED (decl
) = 1;
5666 weak_finish_1 (decl
);
5675 /* Remove the alias and the target from the pending weak list
5676 so that we do not emit any .weak directives for the former,
5677 nor multiple .weak directives for the latter. */
5678 for (p
= &weak_decls
; (t2
= *p
) ; )
5680 if (TREE_VALUE (t2
) == alias_decl
5681 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5682 *p
= TREE_CHAIN (t2
);
5684 p
= &TREE_CHAIN (t2
);
5687 /* Remove other weakrefs to the same target, to speed things up. */
5688 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5690 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5691 *p
= TREE_CHAIN (t2
);
5693 p
= &TREE_CHAIN (t2
);
5698 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5700 tree decl
= TREE_VALUE (t
);
5702 weak_finish_1 (decl
);
5706 /* Emit the assembly bits to indicate that DECL is globally visible. */
5709 globalize_decl (tree decl
)
5712 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5713 if (DECL_WEAK (decl
))
5715 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5718 #ifdef ASM_WEAKEN_DECL
5719 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5721 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5724 /* Remove this function from the pending weak list so that
5725 we do not emit multiple .weak directives for it. */
5726 for (p
= &weak_decls
; (t
= *p
) ; )
5728 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5729 *p
= TREE_CHAIN (t
);
5731 p
= &TREE_CHAIN (t
);
5734 /* Remove weakrefs to the same target from the pending weakref
5735 list, for the same reason. */
5736 for (p
= &weakref_targets
; (t
= *p
) ; )
5738 if (DECL_ASSEMBLER_NAME (decl
)
5739 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5740 *p
= TREE_CHAIN (t
);
5742 p
= &TREE_CHAIN (t
);
5749 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5752 vec
<alias_pair
, va_gc
> *alias_pairs
;
5754 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5755 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5756 tree node is DECL to have the value of the tree node TARGET. */
5759 do_assemble_alias (tree decl
, tree target
)
5763 /* Emulated TLS had better not get this var. */
5764 gcc_assert (!(!targetm
.have_tls
5766 && DECL_THREAD_LOCAL_P (decl
)));
5768 if (TREE_ASM_WRITTEN (decl
))
5771 id
= DECL_ASSEMBLER_NAME (decl
);
5772 ultimate_transparent_alias_target (&id
);
5773 ultimate_transparent_alias_target (&target
);
5775 /* We must force creation of DECL_RTL for debug info generation, even though
5776 we don't use it here. */
5777 make_decl_rtl (decl
);
5779 TREE_ASM_WRITTEN (decl
) = 1;
5780 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5781 TREE_ASM_WRITTEN (id
) = 1;
5783 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5785 if (!TREE_SYMBOL_REFERENCED (target
))
5786 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5788 #ifdef ASM_OUTPUT_WEAKREF
5789 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5790 IDENTIFIER_POINTER (id
),
5791 IDENTIFIER_POINTER (target
));
5793 if (!TARGET_SUPPORTS_WEAK
)
5795 error_at (DECL_SOURCE_LOCATION (decl
),
5796 "weakref is not supported in this configuration");
5803 #ifdef ASM_OUTPUT_DEF
5804 tree orig_decl
= decl
;
5806 if (TREE_CODE (decl
) == FUNCTION_DECL
5807 && cgraph_node::get (decl
)->instrumentation_clone
5808 && cgraph_node::get (decl
)->instrumented_version
)
5809 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5811 /* Make name accessible from other files, if appropriate. */
5813 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5815 globalize_decl (decl
);
5816 maybe_assemble_visibility (decl
);
5818 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5820 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5821 if (targetm
.has_ifunc_p ())
5822 ASM_OUTPUT_TYPE_DIRECTIVE
5823 (asm_out_file
, IDENTIFIER_POINTER (id
),
5827 error_at (DECL_SOURCE_LOCATION (decl
),
5828 "ifunc is not supported on this target");
5831 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5832 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5834 ASM_OUTPUT_DEF (asm_out_file
,
5835 IDENTIFIER_POINTER (id
),
5836 IDENTIFIER_POINTER (target
));
5838 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5843 name
= IDENTIFIER_POINTER (id
);
5844 # ifdef ASM_WEAKEN_DECL
5845 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5847 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5849 /* Remove this function from the pending weak list so that
5850 we do not emit multiple .weak directives for it. */
5851 for (p
= &weak_decls
; (t
= *p
) ; )
5852 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5853 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5854 *p
= TREE_CHAIN (t
);
5856 p
= &TREE_CHAIN (t
);
5858 /* Remove weakrefs to the same target from the pending weakref
5859 list, for the same reason. */
5860 for (p
= &weakref_targets
; (t
= *p
) ; )
5862 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5863 *p
= TREE_CHAIN (t
);
5865 p
= &TREE_CHAIN (t
);
5871 /* Emit an assembler directive to make the symbol for DECL an alias to
5872 the symbol for TARGET. */
5875 assemble_alias (tree decl
, tree target
)
5879 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5881 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5883 ultimate_transparent_alias_target (&target
);
5885 if (alias
== target
)
5886 error ("weakref %q+D ultimately targets itself", decl
);
5887 if (TREE_PUBLIC (decl
))
5888 error ("weakref %q+D must have static linkage", decl
);
5892 #if !defined (ASM_OUTPUT_DEF)
5893 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5894 error_at (DECL_SOURCE_LOCATION (decl
),
5895 "alias definitions not supported in this configuration");
5896 TREE_ASM_WRITTEN (decl
) = 1;
5899 if (!DECL_WEAK (decl
))
5901 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5902 error_at (DECL_SOURCE_LOCATION (decl
),
5903 "ifunc is not supported in this configuration");
5905 error_at (DECL_SOURCE_LOCATION (decl
),
5906 "only weak aliases are supported in this configuration");
5907 TREE_ASM_WRITTEN (decl
) = 1;
5913 TREE_USED (decl
) = 1;
5915 /* Allow aliases to aliases. */
5916 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5917 cgraph_node::get_create (decl
)->alias
= true;
5919 varpool_node::get_create (decl
)->alias
= true;
5921 /* If the target has already been emitted, we don't have to queue the
5922 alias. This saves a tad of memory. */
5923 if (symtab
->global_info_ready
)
5924 target_decl
= find_decl (target
);
5927 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5928 || symtab
->state
>= EXPANSION
)
5929 do_assemble_alias (decl
, target
);
5932 alias_pair p
= {decl
, target
};
5933 vec_safe_push (alias_pairs
, p
);
5937 /* Record and output a table of translations from original function
5938 to its transaction aware clone. Note that tm_pure functions are
5939 considered to be their own clone. */
5941 struct tm_clone_hasher
: ggc_cache_ptr_hash
<tree_map
>
5943 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5944 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5947 keep_cache_entry (tree_map
*&e
)
5949 return ggc_marked_p (e
->base
.from
);
5953 static GTY((cache
)) hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5956 record_tm_clone_pair (tree o
, tree n
)
5958 struct tree_map
**slot
, *h
;
5960 if (tm_clone_hash
== NULL
)
5961 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5963 h
= ggc_alloc
<tree_map
> ();
5964 h
->hash
= htab_hash_pointer (o
);
5968 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5973 get_tm_clone_pair (tree o
)
5977 struct tree_map
*h
, in
;
5980 in
.hash
= htab_hash_pointer (o
);
5981 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5988 struct tm_alias_pair
5996 /* Dump the actual pairs to the .tm_clone_table section. */
5999 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
6003 bool switched
= false;
6005 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
6009 struct cgraph_node
*src_n
= cgraph_node::get (src
);
6010 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
6012 /* The function ipa_tm_create_version() marks the clone as needed if
6013 the original function was needed. But we also mark the clone as
6014 needed if we ever called the clone indirectly through
6015 TM_GETTMCLONE. If neither of these are true, we didn't generate
6016 a clone, and we didn't call it indirectly... no sense keeping it
6017 in the clone table. */
6018 if (!dst_n
|| !dst_n
->definition
)
6021 /* This covers the case where we have optimized the original
6022 function away, and only access the transactional clone. */
6023 if (!src_n
|| !src_n
->definition
)
6028 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
6029 assemble_align (POINTER_SIZE
);
6033 assemble_integer (XEXP (DECL_RTL (src
), 0),
6034 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6035 assemble_integer (XEXP (DECL_RTL (dst
), 0),
6036 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6040 /* Provide a default for the tm_clone_table section. */
6043 default_clone_table_section (void)
6045 return get_named_section (NULL
, ".tm_clone_table", 3);
6048 /* Helper comparison function for qsorting by the DECL_UID stored in
6049 alias_pair->emitted_diags. */
6052 tm_alias_pair_cmp (const void *x
, const void *y
)
6054 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
6055 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
6056 if (p1
->uid
< p2
->uid
)
6058 if (p1
->uid
> p2
->uid
)
6064 finish_tm_clone_pairs (void)
6066 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
6068 if (tm_clone_hash
== NULL
)
6071 /* We need a determenistic order for the .tm_clone_table, otherwise
6072 we will get bootstrap comparison failures, so dump the hash table
6073 to a vector, sort it, and dump the vector. */
6075 /* Dump the hashtable to a vector. */
6077 hash_table
<tm_clone_hasher
>::iterator iter
;
6078 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
6080 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
6081 tm_alias_pairs
.safe_push (p
);
6084 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
6087 dump_tm_clone_pairs (tm_alias_pairs
);
6089 tm_clone_hash
->empty ();
6090 tm_clone_hash
= NULL
;
6091 tm_alias_pairs
.release ();
6095 /* Emit an assembler directive to set symbol for DECL visibility to
6096 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
6099 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
6100 int vis ATTRIBUTE_UNUSED
)
6102 #ifdef HAVE_GAS_HIDDEN
6103 static const char * const visibility_types
[] = {
6104 NULL
, "protected", "hidden", "internal"
6107 const char *name
, *type
;
6110 id
= DECL_ASSEMBLER_NAME (decl
);
6111 ultimate_transparent_alias_target (&id
);
6112 name
= IDENTIFIER_POINTER (id
);
6114 type
= visibility_types
[vis
];
6116 fprintf (asm_out_file
, "\t.%s\t", type
);
6117 assemble_name (asm_out_file
, name
);
6118 fprintf (asm_out_file
, "\n");
6120 if (!DECL_ARTIFICIAL (decl
))
6121 warning (OPT_Wattributes
, "visibility attribute not supported "
6122 "in this configuration; ignored");
6126 /* A helper function to call assemble_visibility when needed for a decl. */
6129 maybe_assemble_visibility (tree decl
)
6131 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
6133 if (TREE_CODE (decl
) == FUNCTION_DECL
6134 && cgraph_node::get (decl
)
6135 && cgraph_node::get (decl
)->instrumentation_clone
6136 && cgraph_node::get (decl
)->instrumented_version
)
6137 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
6139 if (vis
!= VISIBILITY_DEFAULT
)
6141 targetm
.asm_out
.assemble_visibility (decl
, vis
);
6148 /* Returns 1 if the target configuration supports defining public symbols
6149 so that one of them will be chosen at link time instead of generating a
6150 multiply-defined symbol error, whether through the use of weak symbols or
6151 a target-specific mechanism for having duplicates discarded. */
6154 supports_one_only (void)
6156 if (SUPPORTS_ONE_ONLY
)
6158 return TARGET_SUPPORTS_WEAK
;
6161 /* Set up DECL as a public symbol that can be defined in multiple
6162 translation units without generating a linker error. */
6165 make_decl_one_only (tree decl
, tree comdat_group
)
6167 struct symtab_node
*symbol
;
6168 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
6170 TREE_PUBLIC (decl
) = 1;
6173 symbol
= varpool_node::get_create (decl
);
6175 symbol
= cgraph_node::get_create (decl
);
6177 if (SUPPORTS_ONE_ONLY
)
6179 #ifdef MAKE_DECL_ONE_ONLY
6180 MAKE_DECL_ONE_ONLY (decl
);
6182 symbol
->set_comdat_group (comdat_group
);
6184 else if (VAR_P (decl
)
6185 && (DECL_INITIAL (decl
) == 0
6186 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6187 DECL_COMMON (decl
) = 1;
6190 gcc_assert (TARGET_SUPPORTS_WEAK
);
6191 DECL_WEAK (decl
) = 1;
6196 init_varasm_once (void)
6198 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6199 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6200 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6202 shared_constant_pool
= create_constant_pool ();
6204 #ifdef TEXT_SECTION_ASM_OP
6205 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6206 TEXT_SECTION_ASM_OP
);
6209 #ifdef DATA_SECTION_ASM_OP
6210 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6211 DATA_SECTION_ASM_OP
);
6214 #ifdef SDATA_SECTION_ASM_OP
6215 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6216 SDATA_SECTION_ASM_OP
);
6219 #ifdef READONLY_DATA_SECTION_ASM_OP
6220 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6221 READONLY_DATA_SECTION_ASM_OP
);
6224 #ifdef CTORS_SECTION_ASM_OP
6225 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6226 CTORS_SECTION_ASM_OP
);
6229 #ifdef DTORS_SECTION_ASM_OP
6230 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6231 DTORS_SECTION_ASM_OP
);
6234 #ifdef BSS_SECTION_ASM_OP
6235 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6236 output_section_asm_op
,
6237 BSS_SECTION_ASM_OP
);
6240 #ifdef SBSS_SECTION_ASM_OP
6241 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6242 output_section_asm_op
,
6243 SBSS_SECTION_ASM_OP
);
6246 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6247 | SECTION_COMMON
, emit_tls_common
);
6248 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6249 | SECTION_COMMON
, emit_local
);
6250 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6251 | SECTION_COMMON
, emit_common
);
6253 #if defined ASM_OUTPUT_ALIGNED_BSS
6254 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6258 targetm
.asm_out
.init_sections ();
6260 if (readonly_data_section
== NULL
)
6261 readonly_data_section
= text_section
;
6263 #ifdef ASM_OUTPUT_EXTERNAL
6264 pending_assemble_externals_set
= new hash_set
<tree
>;
6269 decl_default_tls_model (const_tree decl
)
6271 enum tls_model kind
;
6274 is_local
= targetm
.binds_local_p (decl
);
6278 kind
= TLS_MODEL_LOCAL_EXEC
;
6280 kind
= TLS_MODEL_INITIAL_EXEC
;
6283 /* Local dynamic is inefficient when we're not combining the
6284 parts of the address. */
6285 else if (optimize
&& is_local
)
6286 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6288 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6289 if (kind
< flag_tls_default
)
6290 kind
= flag_tls_default
;
6295 /* Select a set of attributes for section NAME based on the properties
6296 of DECL and whether or not RELOC indicates that DECL's initializer
6297 might contain runtime relocations.
6299 We make the section read-only and executable for a function decl,
6300 read-only for a const data decl, and writable for a non-const data decl. */
6303 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6307 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6308 flags
= SECTION_CODE
;
6311 enum section_category category
6312 = categorize_decl_for_section (decl
, reloc
);
6313 if (decl_readonly_section_1 (category
))
6315 else if (category
== SECCAT_DATA_REL_RO
6316 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6317 flags
= SECTION_WRITE
| SECTION_RELRO
;
6319 flags
= SECTION_WRITE
;
6323 flags
= SECTION_WRITE
;
6324 if (strcmp (name
, ".data.rel.ro") == 0
6325 || strcmp (name
, ".data.rel.ro.local") == 0)
6326 flags
|= SECTION_RELRO
;
6329 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6330 flags
|= SECTION_LINKONCE
;
6332 if (strcmp (name
, ".vtable_map_vars") == 0)
6333 flags
|= SECTION_LINKONCE
;
6335 if (decl
&& VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6336 flags
|= SECTION_TLS
| SECTION_WRITE
;
6338 if (strcmp (name
, ".bss") == 0
6339 || strncmp (name
, ".bss.", 5) == 0
6340 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6341 || strcmp (name
, ".persistent.bss") == 0
6342 || strcmp (name
, ".sbss") == 0
6343 || strncmp (name
, ".sbss.", 6) == 0
6344 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6345 flags
|= SECTION_BSS
;
6347 if (strcmp (name
, ".tdata") == 0
6348 || strncmp (name
, ".tdata.", 7) == 0
6349 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6350 flags
|= SECTION_TLS
;
6352 if (strcmp (name
, ".tbss") == 0
6353 || strncmp (name
, ".tbss.", 6) == 0
6354 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6355 flags
|= SECTION_TLS
| SECTION_BSS
;
6357 /* These three sections have special ELF types. They are neither
6358 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6359 want to print a section type (@progbits or @nobits). If someone
6360 is silly enough to emit code or TLS variables to one of these
6361 sections, then don't handle them specially. */
6362 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6363 && (strcmp (name
, ".init_array") == 0
6364 || strcmp (name
, ".fini_array") == 0
6365 || strcmp (name
, ".preinit_array") == 0))
6366 flags
|= SECTION_NOTYPE
;
6371 /* Return true if the target supports some form of global BSS,
6372 either through bss_noswitch_section, or by selecting a BSS
6373 section in TARGET_ASM_SELECT_SECTION. */
6376 have_global_bss_p (void)
6378 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6381 /* Output assembly to switch to section NAME with attribute FLAGS.
6382 Four variants for common object file formats. */
6385 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6386 unsigned int flags ATTRIBUTE_UNUSED
,
6387 tree decl ATTRIBUTE_UNUSED
)
6389 /* Some object formats don't support named sections at all. The
6390 front-end should already have flagged this as an error. */
6394 #ifndef TLS_SECTION_ASM_FLAG
6395 #define TLS_SECTION_ASM_FLAG 'T'
6399 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6402 char flagchars
[11], *f
= flagchars
;
6403 unsigned int numeric_value
= 0;
6405 /* If we have already declared this section, we can use an
6406 abbreviated form to switch back to it -- unless this section is
6407 part of a COMDAT groups, in which case GAS requires the full
6408 declaration every time. */
6409 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6410 && (flags
& SECTION_DECLARED
))
6412 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6416 /* If we have a machine specific flag, then use the numeric value to pass
6418 if (targetm
.asm_out
.elf_flags_numeric (flags
, &numeric_value
))
6419 snprintf (f
, sizeof (flagchars
), "0x%08x", numeric_value
);
6422 if (!(flags
& SECTION_DEBUG
))
6424 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6425 if (flags
& SECTION_EXCLUDE
)
6428 if (flags
& SECTION_WRITE
)
6430 if (flags
& SECTION_CODE
)
6432 if (flags
& SECTION_SMALL
)
6434 if (flags
& SECTION_MERGE
)
6436 if (flags
& SECTION_STRINGS
)
6438 if (flags
& SECTION_TLS
)
6439 *f
++ = TLS_SECTION_ASM_FLAG
;
6440 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6442 #ifdef MACH_DEP_SECTION_ASM_FLAG
6443 if (flags
& SECTION_MACH_DEP
)
6444 *f
++ = MACH_DEP_SECTION_ASM_FLAG
;
6449 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6451 if (!(flags
& SECTION_NOTYPE
))
6456 if (flags
& SECTION_BSS
)
6462 /* On platforms that use "@" as the assembly comment character,
6464 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6466 fprintf (asm_out_file
, format
, type
);
6468 if (flags
& SECTION_ENTSIZE
)
6469 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6470 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6472 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6473 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6475 fprintf (asm_out_file
, ",%s,comdat",
6476 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6480 putc ('\n', asm_out_file
);
6484 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6485 tree decl ATTRIBUTE_UNUSED
)
6487 char flagchars
[8], *f
= flagchars
;
6489 if (flags
& SECTION_WRITE
)
6491 if (flags
& SECTION_CODE
)
6495 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6499 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6502 default_coff_asm_named_section (name
, flags
, decl
);
6504 if (flags
& SECTION_LINKONCE
)
6506 /* Functions may have been compiled at various levels of
6507 optimization so we can't use `same_size' here.
6508 Instead, have the linker pick one. */
6509 fprintf (asm_out_file
, "\t.linkonce %s\n",
6510 (flags
& SECTION_CODE
? "discard" : "same_size"));
6514 /* The lame default section selector. */
6517 default_select_section (tree decl
, int reloc
,
6518 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6522 if (decl_readonly_section (decl
, reloc
))
6523 return readonly_data_section
;
6525 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6527 if (! ((flag_pic
&& reloc
)
6528 || !TREE_READONLY (decl
)
6529 || TREE_SIDE_EFFECTS (decl
)
6530 || !TREE_CONSTANT (decl
)))
6531 return readonly_data_section
;
6533 else if (TREE_CODE (decl
) == STRING_CST
)
6534 return readonly_data_section
;
6535 else if (! (flag_pic
&& reloc
))
6536 return readonly_data_section
;
6538 return data_section
;
6541 enum section_category
6542 categorize_decl_for_section (const_tree decl
, int reloc
)
6544 enum section_category ret
;
6546 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6548 else if (TREE_CODE (decl
) == STRING_CST
)
6550 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6551 && asan_protect_global (CONST_CAST_TREE (decl
)))
6552 /* or !flag_merge_constants */
6553 return SECCAT_RODATA
;
6555 return SECCAT_RODATA_MERGE_STR
;
6557 else if (VAR_P (decl
))
6559 tree d
= CONST_CAST_TREE (decl
);
6560 if (bss_initializer_p (decl
))
6562 else if (! TREE_READONLY (decl
)
6563 || TREE_SIDE_EFFECTS (decl
)
6564 || (DECL_INITIAL (decl
)
6565 && ! TREE_CONSTANT (DECL_INITIAL (decl
))))
6567 /* Here the reloc_rw_mask is not testing whether the section should
6568 be read-only or not, but whether the dynamic link will have to
6569 do something. If so, we wish to segregate the data in order to
6570 minimize cache misses inside the dynamic linker. */
6571 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6572 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6576 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6577 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6578 else if (reloc
|| flag_merge_constants
< 2
6579 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6580 /* PR 81697: for architectures that use section anchors we
6581 need to ignore DECL_RTL_SET_P (decl) for string constants
6582 inside this asan_protect_global call because otherwise
6583 we'll wrongly put them into SECCAT_RODATA_MERGE_CONST
6584 section, set DECL_RTL (decl) later on and add DECL to
6585 protected globals via successive asan_protect_global
6586 calls. In this scenario we'll end up with wrong
6587 alignment of these strings at runtime and possible ASan
6589 && asan_protect_global (d
, use_object_blocks_p ()
6590 && use_blocks_for_decl_p (d
))))
6591 /* C and C++ don't allow different variables to share the same
6592 location. -fmerge-all-constants allows even that (at the
6593 expense of not conforming). */
6594 ret
= SECCAT_RODATA
;
6595 else if (DECL_INITIAL (decl
)
6596 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6597 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6599 ret
= SECCAT_RODATA_MERGE_CONST
;
6601 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6603 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6604 || TREE_SIDE_EFFECTS (decl
)
6605 || ! TREE_CONSTANT (decl
))
6608 ret
= SECCAT_RODATA
;
6611 ret
= SECCAT_RODATA
;
6613 /* There are no read-only thread-local sections. */
6614 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6616 /* Note that this would be *just* SECCAT_BSS, except that there's
6617 no concept of a read-only thread-local-data section. */
6618 if (ret
== SECCAT_BSS
6619 || DECL_INITIAL (decl
) == NULL
6620 || (flag_zero_initialized_in_bss
6621 && initializer_zerop (DECL_INITIAL (decl
))))
6627 /* If the target uses small data sections, select it. */
6628 else if (targetm
.in_small_data_p (decl
))
6630 if (ret
== SECCAT_BSS
)
6632 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6633 ret
= SECCAT_SRODATA
;
6642 decl_readonly_section_1 (enum section_category category
)
6647 case SECCAT_RODATA_MERGE_STR
:
6648 case SECCAT_RODATA_MERGE_STR_INIT
:
6649 case SECCAT_RODATA_MERGE_CONST
:
6650 case SECCAT_SRODATA
:
6658 decl_readonly_section (const_tree decl
, int reloc
)
6660 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6663 /* Select a section based on the above categorization. */
6666 default_elf_select_section (tree decl
, int reloc
,
6667 unsigned HOST_WIDE_INT align
)
6670 switch (categorize_decl_for_section (decl
, reloc
))
6673 /* We're not supposed to be called on FUNCTION_DECLs. */
6676 return readonly_data_section
;
6677 case SECCAT_RODATA_MERGE_STR
:
6678 return mergeable_string_section (decl
, align
, 0);
6679 case SECCAT_RODATA_MERGE_STR_INIT
:
6680 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6681 case SECCAT_RODATA_MERGE_CONST
:
6682 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6683 case SECCAT_SRODATA
:
6687 return data_section
;
6688 case SECCAT_DATA_REL
:
6689 sname
= ".data.rel";
6691 case SECCAT_DATA_REL_LOCAL
:
6692 sname
= ".data.rel.local";
6694 case SECCAT_DATA_REL_RO
:
6695 sname
= ".data.rel.ro";
6697 case SECCAT_DATA_REL_RO_LOCAL
:
6698 sname
= ".data.rel.ro.local";
6721 return get_named_section (decl
, sname
, reloc
);
6724 /* Construct a unique section name based on the decl name and the
6725 categorization performed above. */
6728 default_unique_section (tree decl
, int reloc
)
6730 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6731 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6732 const char *prefix
, *name
, *linkonce
;
6736 switch (categorize_decl_for_section (decl
, reloc
))
6739 prefix
= one_only
? ".t" : ".text";
6742 case SECCAT_RODATA_MERGE_STR
:
6743 case SECCAT_RODATA_MERGE_STR_INIT
:
6744 case SECCAT_RODATA_MERGE_CONST
:
6745 prefix
= one_only
? ".r" : ".rodata";
6747 case SECCAT_SRODATA
:
6748 prefix
= one_only
? ".s2" : ".sdata2";
6751 prefix
= one_only
? ".d" : ".data";
6753 case SECCAT_DATA_REL
:
6754 prefix
= one_only
? ".d.rel" : ".data.rel";
6756 case SECCAT_DATA_REL_LOCAL
:
6757 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6759 case SECCAT_DATA_REL_RO
:
6760 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6762 case SECCAT_DATA_REL_RO_LOCAL
:
6763 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6766 prefix
= one_only
? ".s" : ".sdata";
6769 prefix
= one_only
? ".b" : ".bss";
6772 prefix
= one_only
? ".sb" : ".sbss";
6775 prefix
= one_only
? ".td" : ".tdata";
6778 prefix
= one_only
? ".tb" : ".tbss";
6784 id
= DECL_ASSEMBLER_NAME (decl
);
6785 ultimate_transparent_alias_target (&id
);
6786 name
= IDENTIFIER_POINTER (id
);
6787 name
= targetm
.strip_name_encoding (name
);
6789 /* If we're using one_only, then there needs to be a .gnu.linkonce
6790 prefix to the section name. */
6791 linkonce
= one_only
? ".gnu.linkonce" : "";
6793 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6795 set_decl_section_name (decl
, string
);
6798 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6801 compute_reloc_for_rtx_1 (const_rtx x
)
6803 switch (GET_CODE (x
))
6806 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6814 /* Like compute_reloc_for_constant, except for an RTX. The return value
6815 is a mask for which bit 1 indicates a global relocation, and bit 0
6816 indicates a local relocation. */
6819 compute_reloc_for_rtx (const_rtx x
)
6821 switch (GET_CODE (x
))
6825 return compute_reloc_for_rtx_1 (x
);
6830 subrtx_iterator::array_type array
;
6831 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6832 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6842 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6844 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6846 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6847 return data_section
;
6849 return readonly_data_section
;
6853 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6854 unsigned HOST_WIDE_INT align
)
6856 int reloc
= compute_reloc_for_rtx (x
);
6858 /* ??? Handle small data here somehow. */
6860 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6863 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6865 return get_named_section (NULL
, ".data.rel.ro", 3);
6868 return mergeable_constant_section (mode
, align
, 0);
6871 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6874 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6879 /* Careful not to prod global register variables. */
6882 symbol
= XEXP (rtl
, 0);
6883 if (GET_CODE (symbol
) != SYMBOL_REF
)
6886 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6887 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6888 flags
|= SYMBOL_FLAG_FUNCTION
;
6889 if (targetm
.binds_local_p (decl
))
6890 flags
|= SYMBOL_FLAG_LOCAL
;
6891 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6892 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6893 else if (targetm
.in_small_data_p (decl
))
6894 flags
|= SYMBOL_FLAG_SMALL
;
6895 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6896 being PUBLIC, the thing *must* be defined in this translation unit.
6897 Prevent this buglet from being propagated into rtl code as well. */
6898 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6899 flags
|= SYMBOL_FLAG_EXTERNAL
;
6901 SYMBOL_REF_FLAGS (symbol
) = flags
;
6904 /* By default, we do nothing for encode_section_info, so we need not
6905 do anything but discard the '*' marker. */
6908 default_strip_name_encoding (const char *str
)
6910 return str
+ (*str
== '*');
6913 #ifdef ASM_OUTPUT_DEF
6914 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6915 anchor relative to ".", the current section position. */
6918 default_asm_output_anchor (rtx symbol
)
6922 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6923 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6924 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6928 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6931 default_use_anchors_for_symbol_p (const_rtx symbol
)
6936 /* Don't use anchors for mergeable sections. The linker might move
6937 the objects around. */
6938 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6939 if (sect
->common
.flags
& SECTION_MERGE
)
6942 /* Don't use anchors for small data sections. The small data register
6943 acts as an anchor for such sections. */
6944 if (sect
->common
.flags
& SECTION_SMALL
)
6947 decl
= SYMBOL_REF_DECL (symbol
);
6948 if (decl
&& DECL_P (decl
))
6950 /* Don't use section anchors for decls that might be defined or
6951 usurped by other modules. */
6952 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6955 /* Don't use section anchors for decls that will be placed in a
6956 small data section. */
6957 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6958 one above. The problem is that we only use SECTION_SMALL for
6959 sections that should be marked as small in the section directive. */
6960 if (targetm
.in_small_data_p (decl
))
6963 /* Don't use section anchors for decls that won't fit inside a single
6964 anchor range to reduce the amount of instructions required to refer
6965 to the entire declaration. */
6966 if (DECL_SIZE_UNIT (decl
) == NULL_TREE
6967 || !tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
))
6968 || (tree_to_uhwi (DECL_SIZE_UNIT (decl
))
6969 >= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
))
6976 /* Return true when RESOLUTION indicate that symbol will be bound to the
6977 definition provided by current .o file. */
6980 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6982 return (resolution
== LDPR_PREVAILING_DEF
6983 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6984 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6987 /* Return true when RESOLUTION indicate that symbol will be bound locally
6988 within current executable or DSO. */
6991 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6993 return (resolution
== LDPR_PREVAILING_DEF
6994 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6995 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6996 || resolution
== LDPR_PREEMPTED_REG
6997 || resolution
== LDPR_PREEMPTED_IR
6998 || resolution
== LDPR_RESOLVED_IR
6999 || resolution
== LDPR_RESOLVED_EXEC
);
7002 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
7003 uninitialized common symbol in the executable will still be defined
7004 (through COPY relocation) in the executable. */
7007 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
7008 bool extern_protected_data
, bool common_local_p
)
7010 /* A non-decl is an entry in the constant pool. */
7014 /* Weakrefs may not bind locally, even though the weakref itself is always
7015 static and therefore local. Similarly, the resolver for ifunc functions
7016 might resolve to a non-local function.
7017 FIXME: We can resolve the weakref case more curefuly by looking at the
7019 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
7020 || (TREE_CODE (exp
) == FUNCTION_DECL
7021 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
7024 /* Static variables are always local. */
7025 if (! TREE_PUBLIC (exp
))
7028 /* With resolution file in hand, take look into resolutions.
7029 We can't just return true for resolved_locally symbols,
7030 because dynamic linking might overwrite symbols
7031 in shared libraries. */
7032 bool resolved_locally
= false;
7034 bool uninited_common
= (DECL_COMMON (exp
)
7035 && (DECL_INITIAL (exp
) == NULL
7037 && DECL_INITIAL (exp
) == error_mark_node
)));
7039 /* A non-external variable is defined locally only if it isn't
7040 uninitialized COMMON variable or common_local_p is true. */
7041 bool defined_locally
= (!DECL_EXTERNAL (exp
)
7042 && (!uninited_common
|| common_local_p
));
7043 if (symtab_node
*node
= symtab_node::get (exp
))
7045 if (node
->in_other_partition
)
7046 defined_locally
= true;
7047 if (node
->can_be_discarded_p ())
7049 else if (resolution_to_local_definition_p (node
->resolution
))
7050 defined_locally
= resolved_locally
= true;
7051 else if (resolution_local_p (node
->resolution
))
7052 resolved_locally
= true;
7054 if (defined_locally
&& weak_dominate
&& !shlib
)
7055 resolved_locally
= true;
7057 /* Undefined weak symbols are never defined locally. */
7058 if (DECL_WEAK (exp
) && !defined_locally
)
7061 /* A symbol is local if the user has said explicitly that it will be,
7062 or if we have a definition for the symbol. We cannot infer visibility
7063 for undefined symbols. */
7064 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
7065 && (TREE_CODE (exp
) == FUNCTION_DECL
7066 || !extern_protected_data
7067 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
7068 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
7071 /* If PIC, then assume that any global name can be overridden by
7072 symbols resolved from other modules. */
7076 /* Variables defined outside this object might not be local. */
7077 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
7080 /* Non-dominant weak symbols are not defined locally. */
7081 if (DECL_WEAK (exp
) && !resolved_locally
)
7084 /* Uninitialized COMMON variable may be unified with symbols
7085 resolved from other modules. */
7086 if (uninited_common
&& !resolved_locally
)
7089 /* Otherwise we're left with initialized (or non-common) global data
7090 which is of necessity defined locally. */
7094 /* Assume ELF-ish defaults, since that's pretty much the most liberal
7095 wrt cross-module name binding. */
7098 default_binds_local_p (const_tree exp
)
7100 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
7103 /* Similar to default_binds_local_p, but common symbol may be local and
7104 extern protected data is non-local. */
7107 default_binds_local_p_2 (const_tree exp
)
7109 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, true,
7114 default_binds_local_p_1 (const_tree exp
, int shlib
)
7116 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
7119 /* Return true when references to DECL must bind to current definition in
7122 The condition is usually equivalent to whether the function binds to the
7123 current module (shared library or executable), that is to binds_local_p.
7124 We use this fact to avoid need for another target hook and implement
7125 the logic using binds_local_p and just special cases where
7126 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
7127 the weak definitions (that can be overwritten at linktime by other
7128 definition from different object file) and when resolution info is available
7129 we simply use the knowledge passed to us by linker plugin. */
7131 decl_binds_to_current_def_p (const_tree decl
)
7133 gcc_assert (DECL_P (decl
));
7134 if (!targetm
.binds_local_p (decl
))
7136 if (!TREE_PUBLIC (decl
))
7139 /* When resolution is available, just use it. */
7140 if (symtab_node
*node
= symtab_node::get (decl
))
7142 if (node
->resolution
!= LDPR_UNKNOWN
7143 && !node
->can_be_discarded_p ())
7144 return resolution_to_local_definition_p (node
->resolution
);
7147 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
7148 binds locally but still can be overwritten), DECL_COMMON (can be merged
7149 with a non-common definition somewhere in the same module) or
7151 This rely on fact that binds_local_p behave as decl_replaceable_p
7152 for all other declaration types. */
7153 if (DECL_WEAK (decl
))
7155 if (DECL_COMMON (decl
)
7156 && (DECL_INITIAL (decl
) == NULL
7157 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
7159 if (DECL_EXTERNAL (decl
))
7164 /* A replaceable function or variable is one which may be replaced
7165 at link-time with an entirely different definition, provided that the
7166 replacement has the same type. For example, functions declared
7167 with __attribute__((weak)) on most systems are replaceable.
7169 COMDAT functions are not replaceable, since all definitions of the
7170 function must be equivalent. It is important that COMDAT functions
7171 not be treated as replaceable so that use of C++ template
7172 instantiations is not penalized. */
7175 decl_replaceable_p (tree decl
)
7177 gcc_assert (DECL_P (decl
));
7178 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
7180 if (!flag_semantic_interposition
7181 && !DECL_WEAK (decl
))
7183 return !decl_binds_to_current_def_p (decl
);
7186 /* Default function to output code that will globalize a label. A
7187 target must define GLOBAL_ASM_OP or provide its own function to
7188 globalize a label. */
7189 #ifdef GLOBAL_ASM_OP
7191 default_globalize_label (FILE * stream
, const char *name
)
7193 fputs (GLOBAL_ASM_OP
, stream
);
7194 assemble_name (stream
, name
);
7195 putc ('\n', stream
);
7197 #endif /* GLOBAL_ASM_OP */
7199 /* Default function to output code that will globalize a declaration. */
7201 default_globalize_decl_name (FILE * stream
, tree decl
)
7203 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7204 targetm
.asm_out
.globalize_label (stream
, name
);
7207 /* Default function to output a label for unwind information. The
7208 default is to do nothing. A target that needs nonlocal labels for
7209 unwind information must provide its own function to do this. */
7211 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7212 tree decl ATTRIBUTE_UNUSED
,
7213 int for_eh ATTRIBUTE_UNUSED
,
7214 int empty ATTRIBUTE_UNUSED
)
7218 /* Default function to output a label to divide up the exception table.
7219 The default is to do nothing. A target that needs/wants to divide
7220 up the table must provide it's own function to do this. */
7222 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7226 /* This is how to output an internal numbered label where PREFIX is
7227 the class of label and LABELNO is the number within the class. */
7230 default_generate_internal_label (char *buf
, const char *prefix
,
7231 unsigned long labelno
)
7233 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7236 /* This is how to output an internal numbered label where PREFIX is
7237 the class of label and LABELNO is the number within the class. */
7240 default_internal_label (FILE *stream
, const char *prefix
,
7241 unsigned long labelno
)
7243 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7244 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7245 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7249 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7252 default_asm_declare_constant_name (FILE *file
, const char *name
,
7253 const_tree exp ATTRIBUTE_UNUSED
,
7254 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7256 assemble_label (file
, name
);
7259 /* This is the default behavior at the beginning of a file. It's
7260 controlled by two other target-hook toggles. */
7262 default_file_start (void)
7264 if (targetm
.asm_file_start_app_off
7265 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7266 fputs (ASM_APP_OFF
, asm_out_file
);
7268 if (targetm
.asm_file_start_file_directive
)
7270 /* LTO produced units have no meaningful main_input_filename. */
7272 output_file_directive (asm_out_file
, "<artificial>");
7274 output_file_directive (asm_out_file
, main_input_filename
);
7278 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7279 which emits a special section directive used to indicate whether or
7280 not this object file needs an executable stack. This is primarily
7281 a GNU extension to ELF but could be used on other targets. */
7283 int trampolines_created
;
7286 file_end_indicate_exec_stack (void)
7288 unsigned int flags
= SECTION_DEBUG
;
7289 if (trampolines_created
)
7290 flags
|= SECTION_CODE
;
7292 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7295 /* Emit a special section directive to indicate that this object file
7296 was compiled with -fsplit-stack. This is used to let the linker
7297 detect calls between split-stack code and non-split-stack code, so
7298 that it can modify the split-stack code to allocate a sufficiently
7299 large stack. We emit another special section if there are any
7300 functions in this file which have the no_split_stack attribute, to
7301 prevent the linker from warning about being unable to convert the
7302 functions if they call non-split-stack code. */
7305 file_end_indicate_split_stack (void)
7307 if (flag_split_stack
)
7309 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7311 if (saw_no_split_stack
)
7312 switch_to_section (get_section (".note.GNU-no-split-stack",
7313 SECTION_DEBUG
, NULL
));
7317 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7318 a get_unnamed_section callback. */
7321 output_section_asm_op (const void *directive
)
7323 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7326 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7327 the current section is NEW_SECTION. */
7330 switch_to_section (section
*new_section
)
7332 if (in_section
== new_section
)
7335 if (new_section
->common
.flags
& SECTION_FORGET
)
7338 in_section
= new_section
;
7340 switch (SECTION_STYLE (new_section
))
7343 targetm
.asm_out
.named_section (new_section
->named
.name
,
7344 new_section
->named
.common
.flags
,
7345 new_section
->named
.decl
);
7348 case SECTION_UNNAMED
:
7349 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7352 case SECTION_NOSWITCH
:
7357 new_section
->common
.flags
|= SECTION_DECLARED
;
7360 /* If block symbol SYMBOL has not yet been assigned an offset, place
7361 it at the end of its block. */
7364 place_block_symbol (rtx symbol
)
7366 unsigned HOST_WIDE_INT size
, mask
, offset
;
7367 struct constant_descriptor_rtx
*desc
;
7368 unsigned int alignment
;
7369 struct object_block
*block
;
7372 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7373 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7376 /* Work out the symbol's size and alignment. */
7377 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7379 desc
= SYMBOL_REF_CONSTANT (symbol
);
7380 alignment
= desc
->align
;
7381 size
= GET_MODE_SIZE (desc
->mode
);
7383 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7385 decl
= SYMBOL_REF_DECL (symbol
);
7386 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7387 alignment
= DECL_ALIGN (decl
);
7388 size
= get_constant_size (DECL_INITIAL (decl
));
7389 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7390 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7391 && asan_protect_global (DECL_INITIAL (decl
)))
7393 size
+= asan_red_zone_size (size
);
7394 alignment
= MAX (alignment
,
7395 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7400 struct symtab_node
*snode
;
7401 decl
= SYMBOL_REF_DECL (symbol
);
7403 snode
= symtab_node::get (decl
);
7406 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7408 gcc_assert (MEM_P (target
)
7409 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7410 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7411 target
= XEXP (target
, 0);
7412 place_block_symbol (target
);
7413 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7416 alignment
= get_variable_align (decl
);
7417 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7418 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7419 && asan_protect_global (decl
))
7421 size
+= asan_red_zone_size (size
);
7422 alignment
= MAX (alignment
,
7423 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7427 /* Calculate the object's offset from the start of the block. */
7428 block
= SYMBOL_REF_BLOCK (symbol
);
7429 mask
= alignment
/ BITS_PER_UNIT
- 1;
7430 offset
= (block
->size
+ mask
) & ~mask
;
7431 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7433 /* Record the block's new alignment and size. */
7434 block
->alignment
= MAX (block
->alignment
, alignment
);
7435 block
->size
= offset
+ size
;
7437 vec_safe_push (block
->objects
, symbol
);
7440 /* Return the anchor that should be used to address byte offset OFFSET
7441 from the first object in BLOCK. MODEL is the TLS model used
7445 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7446 enum tls_model model
)
7449 unsigned int begin
, middle
, end
;
7450 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7453 /* Work out the anchor's offset. Use an offset of 0 for the first
7454 anchor so that we don't pessimize the case where we take the address
7455 of a variable at the beginning of the block. This is particularly
7456 useful when a block has only one variable assigned to it.
7458 We try to place anchors RANGE bytes apart, so there can then be
7459 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7460 a ptr_mode offset. With some target settings, the lowest such
7461 anchor might be out of range for the lowest ptr_mode offset;
7462 likewise the highest anchor for the highest offset. Use anchors
7463 at the extreme ends of the ptr_mode range in such cases.
7465 All arithmetic uses unsigned integers in order to avoid
7467 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7468 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7469 range
= max_offset
- min_offset
+ 1;
7474 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7477 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7478 delta
-= delta
% range
;
7481 offset
= (HOST_WIDE_INT
) (-delta
);
7485 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7486 delta
-= delta
% range
;
7487 if (delta
> bias
- 1)
7489 offset
= (HOST_WIDE_INT
) delta
;
7493 /* Do a binary search to see if there's already an anchor we can use.
7494 Set BEGIN to the new anchor's index if not. */
7496 end
= vec_safe_length (block
->anchors
);
7497 while (begin
!= end
)
7499 middle
= (end
+ begin
) / 2;
7500 anchor
= (*block
->anchors
)[middle
];
7501 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7503 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7505 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7507 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7513 /* Create a new anchor with a unique label. */
7514 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7515 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7516 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7517 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7519 /* Insert it at index BEGIN. */
7520 vec_safe_insert (block
->anchors
, begin
, anchor
);
7524 /* Output the objects in BLOCK. */
7527 output_object_block (struct object_block
*block
)
7529 struct constant_descriptor_rtx
*desc
;
7531 HOST_WIDE_INT offset
;
7535 if (!block
->objects
)
7538 /* Switch to the section and make sure that the first byte is
7539 suitably aligned. */
7540 /* Special case VTV comdat sections similar to assemble_variable. */
7541 if (SECTION_STYLE (block
->sect
) == SECTION_NAMED
7542 && block
->sect
->named
.name
7543 && (strcmp (block
->sect
->named
.name
, ".vtable_map_vars") == 0))
7544 handle_vtv_comdat_section (block
->sect
, block
->sect
->named
.decl
);
7546 switch_to_section (block
->sect
);
7548 assemble_align (block
->alignment
);
7550 /* Define the values of all anchors relative to the current section
7552 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7553 targetm
.asm_out
.output_anchor (symbol
);
7555 /* Output the objects themselves. */
7557 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7559 /* Move to the object's offset, padding with zeros if necessary. */
7560 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7561 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7562 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7564 desc
= SYMBOL_REF_CONSTANT (symbol
);
7565 /* Pass 1 for align as we have already laid out everything in the block.
7566 So aligning shouldn't be necessary. */
7567 output_constant_pool_1 (desc
, 1);
7568 offset
+= GET_MODE_SIZE (desc
->mode
);
7570 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7573 decl
= SYMBOL_REF_DECL (symbol
);
7574 assemble_constant_contents
7575 (DECL_INITIAL (decl
), XSTR (symbol
, 0), DECL_ALIGN (decl
));
7577 size
= get_constant_size (DECL_INITIAL (decl
));
7579 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7580 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7581 && asan_protect_global (DECL_INITIAL (decl
)))
7583 size
= asan_red_zone_size (size
);
7584 assemble_zeros (size
);
7591 decl
= SYMBOL_REF_DECL (symbol
);
7592 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7593 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7595 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7596 && asan_protect_global (decl
))
7598 size
= asan_red_zone_size (size
);
7599 assemble_zeros (size
);
7606 /* A callback for qsort to compare object_blocks. */
7609 output_object_block_compare (const void *x
, const void *y
)
7611 object_block
*p1
= *(object_block
* const*)x
;
7612 object_block
*p2
= *(object_block
* const*)y
;
7614 if (p1
->sect
->common
.flags
& SECTION_NAMED
7615 && !(p2
->sect
->common
.flags
& SECTION_NAMED
))
7618 if (!(p1
->sect
->common
.flags
& SECTION_NAMED
)
7619 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7622 if (p1
->sect
->common
.flags
& SECTION_NAMED
7623 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7624 return strcmp (p1
->sect
->named
.name
, p2
->sect
->named
.name
);
7626 unsigned f1
= p1
->sect
->common
.flags
;
7627 unsigned f2
= p2
->sect
->common
.flags
;
7630 return f1
< f2
? -1 : 1;
7633 /* Output the definitions of all object_blocks. */
7636 output_object_blocks (void)
7638 vec
<object_block
*, va_heap
> v
;
7639 v
.create (object_block_htab
->elements ());
7641 hash_table
<object_block_hasher
>::iterator hi
;
7643 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab
, obj
, object_block
*, hi
)
7646 /* Sort them in order to output them in a deterministic manner,
7647 otherwise we may get .rodata sections in different orders with
7649 v
.qsort (output_object_block_compare
);
7651 FOR_EACH_VEC_ELT (v
, i
, obj
)
7652 output_object_block (obj
);
7657 /* This function provides a possible implementation of the
7658 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7659 by -frecord-gcc-switches it creates a new mergeable, string section in the
7660 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7661 contains the switches in ASCII format.
7663 FIXME: This code does not correctly handle double quote characters
7664 that appear inside strings, (it strips them rather than preserving them).
7665 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7666 characters - instead it treats them as sub-string separators. Since
7667 we want to emit NUL strings terminators into the object file we have to use
7671 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7675 case SWITCH_TYPE_PASSED
:
7676 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7677 ASM_OUTPUT_SKIP (asm_out_file
, HOST_WIDE_INT_1U
);
7680 case SWITCH_TYPE_DESCRIPTIVE
:
7683 /* Distinguish between invocations where name is NULL. */
7684 static bool started
= false;
7690 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7694 | (SECTION_ENTSIZE
& 1),
7696 switch_to_section (sec
);
7705 /* The return value is currently ignored by the caller, but must be 0.
7706 For -fverbose-asm the return value would be the number of characters
7707 emitted into the assembler file. */
7711 /* Emit text to declare externally defined symbols. It is needed to
7712 properly support non-default visibility. */
7714 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7716 const char *name ATTRIBUTE_UNUSED
)
7718 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7719 set in order to avoid putting out names that are never really
7720 used. Always output visibility specified in the source. */
7721 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7722 && (DECL_VISIBILITY_SPECIFIED (decl
)
7723 || targetm
.binds_local_p (decl
)))
7724 maybe_assemble_visibility (decl
);
7727 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7730 default_asm_output_source_filename (FILE *file
, const char *name
)
7732 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7733 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7735 fprintf (file
, "\t.file\t");
7736 output_quoted_string (file
, name
);
7741 /* Output a file name in the form wanted by System V. */
7744 output_file_directive (FILE *asm_file
, const char *input_name
)
7749 if (input_name
== NULL
)
7750 input_name
= "<stdin>";
7752 input_name
= remap_debug_filename (input_name
);
7754 len
= strlen (input_name
);
7755 na
= input_name
+ len
;
7757 /* NA gets INPUT_NAME sans directory names. */
7758 while (na
> input_name
)
7760 if (IS_DIR_SEPARATOR (na
[-1]))
7765 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7768 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7771 make_debug_expr_from_rtl (const_rtx exp
)
7773 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7774 machine_mode mode
= GET_MODE (exp
);
7777 DECL_ARTIFICIAL (ddecl
) = 1;
7778 if (REG_P (exp
) && REG_EXPR (exp
))
7779 type
= TREE_TYPE (REG_EXPR (exp
));
7780 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7781 type
= TREE_TYPE (MEM_EXPR (exp
));
7784 if (type
&& TYPE_MODE (type
) == mode
)
7785 TREE_TYPE (ddecl
) = type
;
7787 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7788 SET_DECL_MODE (ddecl
, mode
);
7789 dval
= gen_rtx_DEBUG_EXPR (mode
);
7790 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7791 SET_DECL_RTL (ddecl
, dval
);
7795 #ifdef ELF_ASCII_ESCAPES
7796 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7799 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7804 fputs (STRING_ASM_OP
, f
);
7809 escape
= ELF_ASCII_ESCAPES
[c
];
7817 putc ('0'+((c
>>6)&7), f
);
7818 putc ('0'+((c
>>3)&7), f
);
7819 putc ('0'+(c
&7), f
);
7832 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7835 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7837 const char *limit
= s
+ len
;
7838 const char *last_null
= NULL
;
7839 unsigned bytes_in_chunk
= 0;
7843 for (; s
< limit
; s
++)
7847 if (bytes_in_chunk
>= 60)
7856 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7863 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7865 if (bytes_in_chunk
> 0)
7872 default_elf_asm_output_limited_string (f
, s
);
7877 if (bytes_in_chunk
== 0)
7878 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7881 escape
= ELF_ASCII_ESCAPES
[c
];
7890 putc ('0'+((c
>>6)&7), f
);
7891 putc ('0'+((c
>>3)&7), f
);
7892 putc ('0'+(c
&7), f
);
7893 bytes_in_chunk
+= 4;
7898 bytes_in_chunk
+= 2;
7905 if (bytes_in_chunk
> 0)
7913 static GTY(()) section
*elf_init_array_section
;
7914 static GTY(()) section
*elf_fini_array_section
;
7917 get_elf_initfini_array_priority_section (int priority
,
7921 if (priority
!= DEFAULT_INIT_PRIORITY
)
7924 sprintf (buf
, "%s.%.5u",
7925 constructor_p
? ".init_array" : ".fini_array",
7927 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7933 if (elf_init_array_section
== NULL
)
7934 elf_init_array_section
7935 = get_section (".init_array",
7936 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7937 sec
= elf_init_array_section
;
7941 if (elf_fini_array_section
== NULL
)
7942 elf_fini_array_section
7943 = get_section (".fini_array",
7944 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7945 sec
= elf_fini_array_section
;
7951 /* Use .init_array section for constructors. */
7954 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7956 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7958 assemble_addr_to_section (symbol
, sec
);
7961 /* Use .fini_array section for destructors. */
7964 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7966 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7968 assemble_addr_to_section (symbol
, sec
);
7971 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7973 This is a bit of a cheat. The real default is a no-op, but this
7974 hook is the default for all targets with a .ident directive. */
7977 default_asm_output_ident_directive (const char *ident_str
)
7979 const char *ident_asm_op
= "\t.ident\t";
7981 /* If we are still in the front end, do not write out the string
7982 to asm_out_file. Instead, add a fake top-level asm statement.
7983 This allows the front ends to use this hook without actually
7984 writing to asm_out_file, to handle #ident or Pragma Ident. */
7985 if (symtab
->state
== PARSING
)
7987 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7988 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7991 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7995 /* This function ensures that vtable_map variables are not only
7996 in the comdat section, but that each variable has its own unique
7997 comdat name. Without this the variables end up in the same section
7998 with a single comdat name.
8000 FIXME: resolve_unique_section needs to deal better with
8001 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
8002 that is fixed, this if-else statement can be replaced with
8003 a single call to "switch_to_section (sect)". */
8006 handle_vtv_comdat_section (section
*sect
, const_tree decl ATTRIBUTE_UNUSED
)
8008 #if defined (OBJECT_FORMAT_ELF)
8009 targetm
.asm_out
.named_section (sect
->named
.name
,
8010 sect
->named
.common
.flags
8015 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
8016 Therefore the following check is used.
8017 In case a the target is PE or COFF a comdat group section
8018 is created, e.g. .vtable_map_vars$foo. The linker places
8019 everything in .vtable_map_vars at the end.
8021 A fix could be made in
8022 gcc/config/i386/winnt.c: i386_pe_unique_section. */
8027 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
8028 name
= ACONCAT ((sect
->named
.name
, "$",
8029 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
8031 name
= ACONCAT ((sect
->named
.name
, "$",
8032 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
8035 targetm
.asm_out
.named_section (name
,
8036 sect
->named
.common
.flags
8042 switch_to_section (sect
);
8046 #include "gt-varasm.h"