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"
59 #ifdef XCOFF_DEBUGGING_INFO
60 #include "xcoffout.h" /* Needed for external data declarations. */
63 /* The (assembler) name of the first globally-visible object output. */
64 extern GTY(()) const char *first_global_object_name
;
65 extern GTY(()) const char *weak_global_object_name
;
67 const char *first_global_object_name
;
68 const char *weak_global_object_name
;
71 struct constant_descriptor_rtx
;
72 struct rtx_constant_pool
;
74 #define n_deferred_constants (crtl->varasm.deferred_constants)
76 /* Number for making the label on the next
77 constant that is stored in memory. */
79 static GTY(()) int const_labelno
;
81 /* Carry information from ASM_DECLARE_OBJECT_NAME
82 to ASM_FINISH_DECLARE_OBJECT. */
84 int size_directive_output
;
86 /* The last decl for which assemble_variable was called,
87 if it did ASM_DECLARE_OBJECT_NAME.
88 If the last call to assemble_variable didn't do that,
91 tree last_assemble_variable_decl
;
93 /* The following global variable indicates if the first basic block
94 in a function belongs to the cold partition or not. */
96 bool first_function_block_is_cold
;
98 /* Whether we saw any functions with no_split_stack. */
100 static bool saw_no_split_stack
;
102 static const char *strip_reg_name (const char *);
103 static int contains_pointers_p (tree
);
104 #ifdef ASM_OUTPUT_EXTERNAL
105 static bool incorporeal_function_p (tree
);
107 static void decode_addr_const (tree
, struct addr_const
*);
108 static hashval_t
const_hash_1 (const tree
);
109 static int compare_constant (const tree
, const tree
);
110 static void output_constant_def_contents (rtx
);
111 static void output_addressed_constants (tree
);
112 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
114 static void globalize_decl (tree
);
115 static bool decl_readonly_section_1 (enum section_category
);
116 #ifdef BSS_SECTION_ASM_OP
117 #ifdef ASM_OUTPUT_ALIGNED_BSS
118 static void asm_output_aligned_bss (FILE *, tree
, const char *,
119 unsigned HOST_WIDE_INT
, int)
122 #endif /* BSS_SECTION_ASM_OP */
123 static void mark_weak (tree
);
124 static void output_constant_pool (const char *, tree
);
125 static void handle_vtv_comdat_section (section
*, const_tree
);
127 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
128 section
*text_section
;
129 section
*data_section
;
130 section
*readonly_data_section
;
131 section
*sdata_section
;
132 section
*ctors_section
;
133 section
*dtors_section
;
134 section
*bss_section
;
135 section
*sbss_section
;
137 /* Various forms of common section. All are guaranteed to be nonnull. */
138 section
*tls_comm_section
;
139 section
*comm_section
;
140 section
*lcomm_section
;
142 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
144 section
*bss_noswitch_section
;
146 /* The section that holds the main exception table, when known. The section
147 is set either by the target's init_sections hook or by the first call to
148 switch_to_exception_section. */
149 section
*exception_section
;
151 /* The section that holds the DWARF2 frame unwind information, when known.
152 The section is set either by the target's init_sections hook or by the
153 first call to switch_to_eh_frame_section. */
154 section
*eh_frame_section
;
156 /* asm_out_file's current section. This is NULL if no section has yet
157 been selected or if we lose track of what the current section is. */
160 /* True if code for the current function is currently being directed
161 at the cold section. */
162 bool in_cold_section_p
;
164 /* The following global holds the "function name" for the code in the
165 cold section of a function, if hot/cold function splitting is enabled
166 and there was actually code that went into the cold section. A
167 pseudo function name is needed for the cold section of code for some
168 debugging tools that perform symbolization. */
169 tree cold_function_name
= NULL_TREE
;
171 /* A linked list of all the unnamed sections. */
172 static GTY(()) section
*unnamed_sections
;
174 /* Return a nonzero value if DECL has a section attribute. */
175 #define IN_NAMED_SECTION(DECL) \
176 (VAR_OR_FUNCTION_DECL_P (DECL) && DECL_SECTION_NAME (DECL) != NULL)
178 struct section_hasher
: ggc_ptr_hash
<section
>
180 typedef const char *compare_type
;
182 static hashval_t
hash (section
*);
183 static bool equal (section
*, const char *);
186 /* Hash table of named sections. */
187 static GTY(()) hash_table
<section_hasher
> *section_htab
;
189 struct object_block_hasher
: ggc_ptr_hash
<object_block
>
191 typedef const section
*compare_type
;
193 static hashval_t
hash (object_block
*);
194 static bool equal (object_block
*, const section
*);
197 /* A table of object_blocks, indexed by section. */
198 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
200 /* The next number to use for internal anchor labels. */
201 static GTY(()) int anchor_labelno
;
203 /* A pool of constants that can be shared between functions. */
204 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
206 /* Helper routines for maintaining section_htab. */
209 section_hasher::equal (section
*old
, const char *new_name
)
211 return strcmp (old
->named
.name
, new_name
) == 0;
215 section_hasher::hash (section
*old
)
217 return htab_hash_string (old
->named
.name
);
220 /* Return a hash value for section SECT. */
223 hash_section (section
*sect
)
225 if (sect
->common
.flags
& SECTION_NAMED
)
226 return htab_hash_string (sect
->named
.name
);
227 return sect
->common
.flags
;
230 /* Helper routines for maintaining object_block_htab. */
233 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
235 return old
->sect
== new_section
;
239 object_block_hasher::hash (object_block
*old
)
241 return hash_section (old
->sect
);
244 /* Return a new unnamed section with the given fields. */
247 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
252 sect
= ggc_alloc
<section
> ();
253 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
254 sect
->unnamed
.callback
= callback
;
255 sect
->unnamed
.data
= data
;
256 sect
->unnamed
.next
= unnamed_sections
;
258 unnamed_sections
= sect
;
262 /* Return a SECTION_NOSWITCH section with the given fields. */
265 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
269 sect
= ggc_alloc
<section
> ();
270 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
271 sect
->noswitch
.callback
= callback
;
276 /* Return the named section structure associated with NAME. Create
277 a new section with the given fields if no such structure exists. */
280 get_section (const char *name
, unsigned int flags
, tree decl
)
282 section
*sect
, **slot
;
284 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
286 flags
|= SECTION_NAMED
;
289 sect
= ggc_alloc
<section
> ();
290 sect
->named
.common
.flags
= flags
;
291 sect
->named
.name
= ggc_strdup (name
);
292 sect
->named
.decl
= decl
;
298 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
299 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
301 /* It is fine if one of the section flags is
302 SECTION_WRITE | SECTION_RELRO and the other has none of these
303 flags (i.e. read-only) in named sections and either the
304 section hasn't been declared yet or has been declared as writable.
305 In that case just make sure the resulting flags are
306 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
308 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
309 == (SECTION_WRITE
| SECTION_RELRO
)
310 && (sect
->common
.flags
311 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
312 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
313 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
314 || (sect
->common
.flags
& SECTION_WRITE
)))
316 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
319 /* Sanity check user variables for flag changes. */
320 if (sect
->named
.decl
!= NULL
321 && DECL_P (sect
->named
.decl
)
322 && decl
!= sect
->named
.decl
)
324 if (decl
!= NULL
&& DECL_P (decl
))
325 error ("%+qD causes a section type conflict with %qD",
326 decl
, sect
->named
.decl
);
328 error ("section type conflict with %qD", sect
->named
.decl
);
329 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
330 "%qD was declared here", sect
->named
.decl
);
332 else if (decl
!= NULL
&& DECL_P (decl
))
333 error ("%+qD causes a section type conflict", decl
);
335 error ("section type conflict");
336 /* Make sure we don't error about one section multiple times. */
337 sect
->common
.flags
|= SECTION_OVERRIDE
;
343 /* Return true if the current compilation mode benefits from having
344 objects grouped into blocks. */
347 use_object_blocks_p (void)
349 return flag_section_anchors
;
352 /* Return the object_block structure for section SECT. Create a new
353 structure if we haven't created one already. Return null if SECT
356 static struct object_block
*
357 get_block_for_section (section
*sect
)
359 struct object_block
*block
;
365 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
370 block
= ggc_cleared_alloc
<object_block
> ();
377 /* Create a symbol with label LABEL and place it at byte offset
378 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
379 is not yet known. LABEL must be a garbage-collected string. */
382 create_block_symbol (const char *label
, struct object_block
*block
,
383 HOST_WIDE_INT offset
)
388 /* Create the extended SYMBOL_REF. */
389 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
390 symbol
= (rtx
) ggc_internal_alloc (size
);
392 /* Initialize the normal SYMBOL_REF fields. */
393 memset (symbol
, 0, size
);
394 PUT_CODE (symbol
, SYMBOL_REF
);
395 PUT_MODE (symbol
, Pmode
);
396 XSTR (symbol
, 0) = label
;
397 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
399 /* Initialize the block_symbol stuff. */
400 SYMBOL_REF_BLOCK (symbol
) = block
;
401 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
406 /* Return a section with a particular name and with whatever SECTION_*
407 flags section_type_flags deems appropriate. The name of the section
408 is taken from NAME if nonnull, otherwise it is taken from DECL's
409 DECL_SECTION_NAME. DECL is the decl associated with the section
410 (see the section comment for details) and RELOC is as for
411 section_type_flags. */
414 get_named_section (tree decl
, const char *name
, int reloc
)
420 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
421 name
= DECL_SECTION_NAME (decl
);
424 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
425 return get_section (name
, flags
, decl
);
428 /* Worker for resolve_unique_section. */
431 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
433 n
->implicit_section
= true;
437 /* If required, set DECL_SECTION_NAME to a unique name. */
440 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
441 int flag_function_or_data_sections
)
443 if (DECL_SECTION_NAME (decl
) == NULL
444 && targetm_common
.have_named_sections
445 && (flag_function_or_data_sections
446 || DECL_COMDAT_GROUP (decl
)))
448 targetm
.asm_out
.unique_section (decl
, reloc
);
449 if (DECL_SECTION_NAME (decl
))
450 symtab_node::get (decl
)->call_for_symbol_and_aliases
451 (set_implicit_section
, NULL
, true);
455 #ifdef BSS_SECTION_ASM_OP
457 #ifdef ASM_OUTPUT_ALIGNED_BSS
459 /* Utility function for targets to use in implementing
460 ASM_OUTPUT_ALIGNED_BSS.
461 ??? It is believed that this function will work in most cases so such
462 support is localized here. */
465 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
466 const char *name
, unsigned HOST_WIDE_INT size
,
469 switch_to_section (bss_section
);
470 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
471 #ifdef ASM_DECLARE_OBJECT_NAME
472 last_assemble_variable_decl
= decl
;
473 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
475 /* Standard thing is just output label for the object. */
476 ASM_OUTPUT_LABEL (file
, name
);
477 #endif /* ASM_DECLARE_OBJECT_NAME */
478 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
483 #endif /* BSS_SECTION_ASM_OP */
485 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
486 /* Return the hot section for function DECL. Return text_section for
490 hot_function_section (tree decl
)
492 if (decl
!= NULL_TREE
493 && DECL_SECTION_NAME (decl
) != NULL
494 && targetm_common
.have_named_sections
)
495 return get_named_section (decl
, NULL
, 0);
501 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
504 When DECL_SECTION_NAME is non-NULL and it is implicit section and
505 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
506 concatenate the name with NAMED_SECTION_SUFFIX.
507 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
510 get_named_text_section (tree decl
,
511 const char *text_section_name
,
512 const char *named_section_suffix
)
514 if (decl
&& DECL_SECTION_NAME (decl
))
516 if (named_section_suffix
)
518 const char *dsn
= DECL_SECTION_NAME (decl
);
519 const char *stripped_name
;
522 name
= (char *) alloca (strlen (dsn
) + 1);
526 stripped_name
= targetm
.strip_name_encoding (name
);
528 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
529 return get_named_section (decl
, buffer
, 0);
531 else if (symtab_node::get (decl
)->implicit_section
)
535 /* Do not try to split gnu_linkonce functions. This gets somewhat
537 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
539 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
540 name
= targetm
.strip_name_encoding (name
);
541 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
547 return get_named_section (decl
, text_section_name
, 0);
550 /* Choose named function section based on its frequency. */
553 default_function_section (tree decl
, enum node_frequency freq
,
554 bool startup
, bool exit
)
556 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
557 /* Old GNU linkers have buggy --gc-section support, which sometimes
558 results in .gcc_except_table* sections being garbage collected. */
560 && symtab_node::get (decl
)->implicit_section
)
564 if (!flag_reorder_functions
565 || !targetm_common
.have_named_sections
)
567 /* Startup code should go to startup subsection unless it is
568 unlikely executed (this happens especially with function splitting
569 where we can split away unnecessary parts of static constructors. */
570 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
572 /* If we do have a profile or(and) LTO phase is executed, we do not need
573 these ELF section. */
574 if (!in_lto_p
|| !flag_profile_values
)
575 return get_named_text_section (decl
, ".text.startup", NULL
);
580 /* Similarly for exit. */
581 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
582 return get_named_text_section (decl
, ".text.exit", NULL
);
584 /* Group cold functions together, similarly for hot code. */
587 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
588 return get_named_text_section (decl
, ".text.unlikely", NULL
);
589 case NODE_FREQUENCY_HOT
:
590 /* If we do have a profile or(and) LTO phase is executed, we do not need
591 these ELF section. */
592 if (!in_lto_p
|| !flag_profile_values
)
593 return get_named_text_section (decl
, ".text.hot", NULL
);
600 /* Return the section for function DECL.
602 If DECL is NULL_TREE, return the text section. We can be passed
603 NULL_TREE under some circumstances by dbxout.c at least.
605 If FORCE_COLD is true, return cold function section ignoring
606 the frequency info of cgraph_node. */
609 function_section_1 (tree decl
, bool force_cold
)
611 section
*section
= NULL
;
612 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
613 bool startup
= false, exit
= false;
617 struct cgraph_node
*node
= cgraph_node::get (decl
);
621 freq
= node
->frequency
;
622 startup
= node
->only_called_at_startup
;
623 exit
= node
->only_called_at_exit
;
627 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
629 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
630 if (decl
!= NULL_TREE
631 && DECL_SECTION_NAME (decl
) != NULL
)
633 if (targetm
.asm_out
.function_section
)
634 section
= targetm
.asm_out
.function_section (decl
, freq
,
638 return get_named_section (decl
, NULL
, 0);
641 return targetm
.asm_out
.select_section
642 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
643 symtab_node::get (decl
)->definition_alignment ());
645 if (targetm
.asm_out
.function_section
)
646 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
649 return hot_function_section (decl
);
653 /* Return the section for function DECL.
655 If DECL is NULL_TREE, return the text section. We can be passed
656 NULL_TREE under some circumstances by dbxout.c at least. */
659 function_section (tree decl
)
661 /* Handle cases where function splitting code decides
662 to put function entry point into unlikely executed section
663 despite the fact that the function itself is not cold
664 (i.e. it is called rarely but contains a hot loop that is
665 better to live in hot subsection for the code locality). */
666 return function_section_1 (decl
,
667 first_function_block_is_cold
);
670 /* Return the section for the current function, take IN_COLD_SECTION_P
674 current_function_section (void)
676 return function_section_1 (current_function_decl
, in_cold_section_p
);
679 /* Tell assembler to switch to unlikely-to-be-executed text section. */
682 unlikely_text_section (void)
684 return function_section_1 (current_function_decl
, true);
687 /* When called within a function context, return true if the function
688 has been assigned a cold text section and if SECT is that section.
689 When called outside a function context, return true if SECT is the
690 default cold section. */
693 unlikely_text_section_p (section
*sect
)
695 return sect
== function_section_1 (current_function_decl
, true);
698 /* Switch to the other function partition (if inside of hot section
699 into cold section, otherwise into the hot section). */
702 switch_to_other_text_partition (void)
704 in_cold_section_p
= !in_cold_section_p
;
705 switch_to_section (current_function_section ());
708 /* Return the read-only data section associated with function DECL. */
711 default_function_rodata_section (tree decl
)
713 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
715 const char *name
= DECL_SECTION_NAME (decl
);
717 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
723 dot
= strchr (name
+ 1, '.');
726 len
= strlen (dot
) + 8;
727 rname
= (char *) alloca (len
);
729 strcpy (rname
, ".rodata");
731 return get_section (rname
, SECTION_LINKONCE
, decl
);
733 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
734 else if (DECL_COMDAT_GROUP (decl
)
735 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
737 size_t len
= strlen (name
) + 1;
738 char *rname
= (char *) alloca (len
);
740 memcpy (rname
, name
, len
);
742 return get_section (rname
, SECTION_LINKONCE
, decl
);
744 /* For .text.foo we want to use .rodata.foo. */
745 else if (flag_function_sections
&& flag_data_sections
746 && strncmp (name
, ".text.", 6) == 0)
748 size_t len
= strlen (name
) + 1;
749 char *rname
= (char *) alloca (len
+ 2);
751 memcpy (rname
, ".rodata", 7);
752 memcpy (rname
+ 7, name
+ 5, len
- 5);
753 return get_section (rname
, 0, decl
);
757 return readonly_data_section
;
760 /* Return the read-only data section associated with function DECL
761 for targets where that section should be always the single
762 readonly data section. */
765 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
767 return readonly_data_section
;
770 /* A subroutine of mergeable_string_section and mergeable_constant_section. */
773 function_mergeable_rodata_prefix (void)
775 section
*s
= targetm
.asm_out
.function_rodata_section (current_function_decl
);
776 if (SECTION_STYLE (s
) == SECTION_NAMED
)
777 return s
->named
.name
;
779 return targetm
.asm_out
.mergeable_rodata_prefix
;
782 /* Return the section to use for string merging. */
785 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
786 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
787 unsigned int flags ATTRIBUTE_UNUSED
)
791 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
792 && TREE_CODE (decl
) == STRING_CST
793 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
795 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
796 && TREE_STRING_LENGTH (decl
) >= len
)
798 scalar_int_mode mode
;
799 unsigned int modesize
;
803 const char *prefix
= function_mergeable_rodata_prefix ();
804 char *name
= (char *) alloca (strlen (prefix
) + 30);
806 mode
= SCALAR_INT_TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
807 modesize
= GET_MODE_BITSIZE (mode
);
808 if (modesize
>= 8 && modesize
<= 256
809 && (modesize
& (modesize
- 1)) == 0)
811 if (align
< modesize
)
814 str
= TREE_STRING_POINTER (decl
);
815 unit
= GET_MODE_SIZE (mode
);
817 /* Check for embedded NUL characters. */
818 for (i
= 0; i
< len
; i
+= unit
)
820 for (j
= 0; j
< unit
; j
++)
821 if (str
[i
+ j
] != '\0')
828 sprintf (name
, "%s.str%d.%d", prefix
,
829 modesize
/ 8, (int) (align
/ 8));
830 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
831 return get_section (name
, flags
, NULL
);
836 return readonly_data_section
;
839 /* Return the section to use for constant merging. */
842 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
843 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
844 unsigned int flags ATTRIBUTE_UNUSED
)
846 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
849 && known_le (GET_MODE_BITSIZE (mode
), align
)
852 && (align
& (align
- 1)) == 0)
854 const char *prefix
= function_mergeable_rodata_prefix ();
855 char *name
= (char *) alloca (strlen (prefix
) + 30);
857 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
858 flags
|= (align
/ 8) | SECTION_MERGE
;
859 return get_section (name
, flags
, NULL
);
861 return readonly_data_section
;
864 /* Given NAME, a putative register name, discard any customary prefixes. */
867 strip_reg_name (const char *name
)
869 #ifdef REGISTER_PREFIX
870 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
871 name
+= strlen (REGISTER_PREFIX
);
873 if (name
[0] == '%' || name
[0] == '#')
878 /* The user has asked for a DECL to have a particular name. Set (or
879 change) it in such a way that we don't prefix an underscore to
882 set_user_assembler_name (tree decl
, const char *name
)
884 char *starred
= (char *) alloca (strlen (name
) + 2);
886 strcpy (starred
+ 1, name
);
887 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
888 SET_DECL_RTL (decl
, NULL_RTX
);
891 /* Decode an `asm' spec for a declaration as a register name.
892 Return the register number, or -1 if nothing specified,
893 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
894 or -3 if ASMSPEC is `cc' and is not recognized,
895 or -4 if ASMSPEC is `memory' and is not recognized.
896 Accept an exact spelling or a decimal number.
897 Prefixes such as % are optional. */
900 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
902 /* Presume just one register is clobbered. */
909 /* Get rid of confusing prefixes. */
910 asmspec
= strip_reg_name (asmspec
);
912 /* Allow a decimal number as a "register name". */
913 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
914 if (! ISDIGIT (asmspec
[i
]))
916 if (asmspec
[0] != 0 && i
< 0)
919 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
925 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
927 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
930 #ifdef OVERLAPPING_REGISTER_NAMES
934 const char *const name
;
937 } table
[] = OVERLAPPING_REGISTER_NAMES
;
939 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
941 && ! strcmp (asmspec
, table
[i
].name
))
943 *pnregs
= table
[i
].nregs
;
944 return table
[i
].number
;
947 #endif /* OVERLAPPING_REGISTER_NAMES */
949 #ifdef ADDITIONAL_REGISTER_NAMES
951 static const struct { const char *const name
; const int number
; } table
[]
952 = ADDITIONAL_REGISTER_NAMES
;
954 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
956 && ! strcmp (asmspec
, table
[i
].name
)
957 && reg_names
[table
[i
].number
][0])
958 return table
[i
].number
;
960 #endif /* ADDITIONAL_REGISTER_NAMES */
962 if (!strcmp (asmspec
, "memory"))
965 if (!strcmp (asmspec
, "cc"))
975 decode_reg_name (const char *name
)
978 return decode_reg_name_and_count (name
, &count
);
982 /* Return true if DECL's initializer is suitable for a BSS section. */
985 bss_initializer_p (const_tree decl
)
987 /* Do not put non-common constants into the .bss section, they belong in
988 a readonly section. */
989 return ((!TREE_READONLY (decl
) || DECL_COMMON (decl
))
990 && (DECL_INITIAL (decl
) == NULL
991 /* In LTO we have no errors in program; error_mark_node is used
992 to mark offlined constructors. */
993 || (DECL_INITIAL (decl
) == error_mark_node
995 || (flag_zero_initialized_in_bss
996 && initializer_zerop (DECL_INITIAL (decl
)))));
999 /* Compute the alignment of variable specified by DECL.
1000 DONT_OUTPUT_DATA is from assemble_variable. */
1003 align_variable (tree decl
, bool dont_output_data
)
1005 unsigned int align
= DECL_ALIGN (decl
);
1007 /* In the case for initialing an array whose length isn't specified,
1008 where we have not yet been able to do the layout,
1009 figure out the proper alignment now. */
1010 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1011 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1012 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1014 /* Some object file formats have a maximum alignment which they support.
1015 In particular, a.out format supports a maximum alignment of 4. */
1016 if (align
> MAX_OFILE_ALIGNMENT
)
1018 error ("alignment of %q+D is greater than maximum object "
1019 "file alignment %d", decl
,
1020 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1021 align
= MAX_OFILE_ALIGNMENT
;
1024 if (! DECL_USER_ALIGN (decl
))
1026 #ifdef DATA_ABI_ALIGNMENT
1027 unsigned int data_abi_align
1028 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1029 /* For backwards compatibility, don't assume the ABI alignment for
1031 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1032 align
= data_abi_align
;
1035 /* On some machines, it is good to increase alignment sometimes.
1036 But as DECL_ALIGN is used both for actually emitting the variable
1037 and for code accessing the variable as guaranteed alignment, we
1038 can only increase the alignment if it is a performance optimization
1039 if the references to it must bind to the current definition. */
1040 if (decl_binds_to_current_def_p (decl
)
1041 && !DECL_VIRTUAL_P (decl
))
1043 #ifdef DATA_ALIGNMENT
1044 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1045 /* Don't increase alignment too much for TLS variables - TLS space
1047 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1050 if (DECL_INITIAL (decl
) != 0
1051 /* In LTO we have no errors in program; error_mark_node is used
1052 to mark offlined constructors. */
1053 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1055 unsigned int const_align
1056 = targetm
.constant_alignment (DECL_INITIAL (decl
), align
);
1057 /* Don't increase alignment too much for TLS variables - TLS
1058 space is too precious. */
1059 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1060 align
= const_align
;
1065 /* Reset the alignment in case we have made it tighter, so we can benefit
1066 from it in get_pointer_alignment. */
1067 SET_DECL_ALIGN (decl
, align
);
1070 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1071 beyond what align_variable returned. */
1074 get_variable_align (tree decl
)
1076 unsigned int align
= DECL_ALIGN (decl
);
1078 /* For user aligned vars or static vars align_variable already did
1080 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1083 #ifdef DATA_ABI_ALIGNMENT
1084 if (DECL_THREAD_LOCAL_P (decl
))
1085 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1088 /* For decls that bind to the current definition, align_variable
1089 did also everything, except for not assuming ABI required alignment
1090 of TLS variables. For other vars, increase the alignment here
1091 as an optimization. */
1092 if (!decl_binds_to_current_def_p (decl
))
1094 /* On some machines, it is good to increase alignment sometimes. */
1095 #ifdef DATA_ALIGNMENT
1096 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1097 /* Don't increase alignment too much for TLS variables - TLS space
1099 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1102 if (DECL_INITIAL (decl
) != 0
1103 /* In LTO we have no errors in program; error_mark_node is used
1104 to mark offlined constructors. */
1105 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1107 unsigned int const_align
1108 = targetm
.constant_alignment (DECL_INITIAL (decl
), align
);
1109 /* Don't increase alignment too much for TLS variables - TLS space
1111 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1112 align
= const_align
;
1119 /* Return the section into which the given VAR_DECL or CONST_DECL
1120 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1121 section should be used wherever possible. */
1124 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1126 addr_space_t as
= ADDR_SPACE_GENERIC
;
1128 varpool_node
*vnode
= varpool_node::get (decl
);
1131 vnode
= vnode
->ultimate_alias_target ();
1135 if (TREE_TYPE (decl
) != error_mark_node
)
1136 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1138 /* We need the constructor to figure out reloc flag. */
1140 vnode
->get_constructor ();
1142 if (DECL_COMMON (decl
))
1144 /* If the decl has been given an explicit section name, or it resides
1145 in a non-generic address space, then it isn't common, and shouldn't
1146 be handled as such. */
1147 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1148 && ADDR_SPACE_GENERIC_P (as
));
1149 if (DECL_THREAD_LOCAL_P (decl
))
1150 return tls_comm_section
;
1151 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1152 return comm_section
;
1155 if (DECL_INITIAL (decl
) == error_mark_node
)
1156 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1157 else if (DECL_INITIAL (decl
))
1158 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1162 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1163 if (IN_NAMED_SECTION (decl
))
1165 section
*sect
= get_named_section (decl
, NULL
, reloc
);
1167 if ((sect
->common
.flags
& SECTION_BSS
) && !bss_initializer_p (decl
))
1169 error_at (DECL_SOURCE_LOCATION (decl
),
1170 "only zero initializers are allowed in section %qs",
1172 DECL_INITIAL (decl
) = error_mark_node
;
1177 if (ADDR_SPACE_GENERIC_P (as
)
1178 && !DECL_THREAD_LOCAL_P (decl
)
1179 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1180 && bss_initializer_p (decl
))
1182 if (!TREE_PUBLIC (decl
)
1183 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1184 && asan_protect_global (decl
)))
1185 return lcomm_section
;
1186 if (bss_noswitch_section
)
1187 return bss_noswitch_section
;
1190 return targetm
.asm_out
.select_section (decl
, reloc
,
1191 get_variable_align (decl
));
1194 /* Return the block into which object_block DECL should be placed. */
1196 static struct object_block
*
1197 get_block_for_decl (tree decl
)
1203 /* The object must be defined in this translation unit. */
1204 if (DECL_EXTERNAL (decl
))
1207 /* There's no point using object blocks for something that is
1208 isolated by definition. */
1209 if (DECL_COMDAT_GROUP (decl
))
1213 /* We can only calculate block offsets if the decl has a known
1215 if (DECL_SIZE_UNIT (decl
) == NULL
)
1217 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1220 /* Find out which section should contain DECL. We cannot put it into
1221 an object block if it requires a standalone definition. */
1223 align_variable (decl
, 0);
1224 sect
= get_variable_section (decl
, true);
1225 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1228 return get_block_for_section (sect
);
1231 /* Make sure block symbol SYMBOL is in block BLOCK. */
1234 change_symbol_block (rtx symbol
, struct object_block
*block
)
1236 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1238 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1239 SYMBOL_REF_BLOCK (symbol
) = block
;
1243 /* Return true if it is possible to put DECL in an object_block. */
1246 use_blocks_for_decl_p (tree decl
)
1248 struct symtab_node
*snode
;
1250 /* Only data DECLs can be placed into object blocks. */
1251 if (!VAR_P (decl
) && TREE_CODE (decl
) != CONST_DECL
)
1254 /* Detect decls created by dw2_force_const_mem. Such decls are
1255 special because DECL_INITIAL doesn't specify the decl's true value.
1256 dw2_output_indirect_constants will instead call assemble_variable
1257 with dont_output_data set to 1 and then print the contents itself. */
1258 if (DECL_INITIAL (decl
) == decl
)
1261 /* If this decl is an alias, then we don't want to emit a
1264 && (snode
= symtab_node::get (decl
)) != NULL
1268 return targetm
.use_blocks_for_decl_p (decl
);
1271 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1272 until we find an identifier that is not itself a transparent alias.
1273 Modify the alias passed to it by reference (and all aliases on the
1274 way to the ultimate target), such that they do not have to be
1275 followed again, and return the ultimate target of the alias
1279 ultimate_transparent_alias_target (tree
*alias
)
1281 tree target
= *alias
;
1283 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1285 gcc_assert (TREE_CHAIN (target
));
1286 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1287 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1288 && ! TREE_CHAIN (target
));
1295 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1296 have static storage duration. In other words, it should not be an
1297 automatic variable, including PARM_DECLs.
1299 There is, however, one exception: this function handles variables
1300 explicitly placed in a particular register by the user.
1302 This is never called for PARM_DECL nodes. */
1305 make_decl_rtl (tree decl
)
1307 const char *name
= 0;
1312 /* Check that we are not being given an automatic variable. */
1313 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1314 && TREE_CODE (decl
) != RESULT_DECL
);
1316 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1317 gcc_assert (!VAR_P (decl
)
1318 || TREE_STATIC (decl
)
1319 || TREE_PUBLIC (decl
)
1320 || DECL_EXTERNAL (decl
)
1321 || DECL_REGISTER (decl
));
1323 /* And that we were not given a type or a label. */
1324 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1325 && TREE_CODE (decl
) != LABEL_DECL
);
1327 /* For a duplicate declaration, we can be called twice on the
1328 same DECL node. Don't discard the RTL already made. */
1329 if (DECL_RTL_SET_P (decl
))
1331 /* If the old RTL had the wrong mode, fix the mode. */
1332 x
= DECL_RTL (decl
);
1333 if (GET_MODE (x
) != DECL_MODE (decl
))
1334 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1336 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1339 /* ??? Another way to do this would be to maintain a hashed
1340 table of such critters. Instead of adding stuff to a DECL
1341 to give certain attributes to it, we could use an external
1342 hash map from DECL to set of attributes. */
1344 /* Let the target reassign the RTL if it wants.
1345 This is necessary, for example, when one machine specific
1346 decl attribute overrides another. */
1347 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1349 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1350 on the new decl information. */
1352 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1353 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1354 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1359 /* If this variable belongs to the global constant pool, retrieve the
1360 pre-computed RTL or recompute it in LTO mode. */
1361 if (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
1363 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1367 id
= DECL_ASSEMBLER_NAME (decl
);
1368 if (TREE_CODE (decl
) == FUNCTION_DECL
1369 && cgraph_node::get (decl
)
1370 && cgraph_node::get (decl
)->instrumentation_clone
)
1371 ultimate_transparent_alias_target (&id
);
1372 name
= IDENTIFIER_POINTER (id
);
1374 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1375 && DECL_REGISTER (decl
))
1377 error ("register name not specified for %q+D", decl
);
1379 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1381 const char *asmspec
= name
+1;
1382 machine_mode mode
= DECL_MODE (decl
);
1383 reg_number
= decode_reg_name (asmspec
);
1384 /* First detect errors in declaring global registers. */
1385 if (reg_number
== -1)
1386 error ("register name not specified for %q+D", decl
);
1387 else if (reg_number
< 0)
1388 error ("invalid register name for %q+D", decl
);
1389 else if (mode
== BLKmode
)
1390 error ("data type of %q+D isn%'t suitable for a register",
1392 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1393 error ("the register specified for %q+D cannot be accessed"
1394 " by the current target", decl
);
1395 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1396 error ("the register specified for %q+D is not general enough"
1397 " to be used as a register variable", decl
);
1398 else if (!targetm
.hard_regno_mode_ok (reg_number
, mode
))
1399 error ("register specified for %q+D isn%'t suitable for data type",
1401 /* Now handle properly declared static register variables. */
1406 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1408 DECL_INITIAL (decl
) = 0;
1409 error ("global register variable has initial value");
1411 if (TREE_THIS_VOLATILE (decl
))
1412 warning (OPT_Wvolatile_register_var
,
1413 "optimization may eliminate reads and/or "
1414 "writes to register variables");
1416 /* If the user specified one of the eliminables registers here,
1417 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1418 confused with that register and be eliminated. This usage is
1419 somewhat suspect... */
1421 SET_DECL_RTL (decl
, gen_raw_REG (mode
, reg_number
));
1422 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1423 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1425 if (TREE_STATIC (decl
))
1427 /* Make this register global, so not usable for anything
1429 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1430 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1431 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1433 nregs
= hard_regno_nregs (reg_number
, mode
);
1435 globalize_reg (decl
, reg_number
+ --nregs
);
1438 /* As a register variable, it has no section. */
1441 /* Avoid internal errors from invalid register
1443 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1444 DECL_HARD_REGISTER (decl
) = 0;
1445 /* Also avoid SSA inconsistencies by pretending this is an external
1447 DECL_EXTERNAL (decl
) = 1;
1450 /* Now handle ordinary static variables and functions (in memory).
1451 Also handle vars declared register invalidly. */
1452 else if (name
[0] == '*')
1454 #ifdef REGISTER_PREFIX
1455 if (strlen (REGISTER_PREFIX
) != 0)
1457 reg_number
= decode_reg_name (name
);
1458 if (reg_number
>= 0 || reg_number
== -3)
1459 error ("register name given for non-register variable %q+D", decl
);
1464 /* Specifying a section attribute on a variable forces it into a
1465 non-.bss section, and thus it cannot be common. */
1466 /* FIXME: In general this code should not be necessary because
1467 visibility pass is doing the same work. But notice_global_symbol
1468 is called early and it needs to make DECL_RTL to get the name.
1469 we take care of recomputing the DECL_RTL after visibility is changed. */
1471 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1472 && DECL_SECTION_NAME (decl
) != NULL
1473 && DECL_INITIAL (decl
) == NULL_TREE
1474 && DECL_COMMON (decl
))
1475 DECL_COMMON (decl
) = 0;
1477 /* Variables can't be both common and weak. */
1478 if (VAR_P (decl
) && DECL_WEAK (decl
))
1479 DECL_COMMON (decl
) = 0;
1481 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1482 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1485 machine_mode address_mode
= Pmode
;
1486 if (TREE_TYPE (decl
) != error_mark_node
)
1488 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1489 address_mode
= targetm
.addr_space
.address_mode (as
);
1491 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1493 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1494 SET_SYMBOL_REF_DECL (x
, decl
);
1496 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1497 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1498 set_mem_attributes (x
, decl
, 1);
1499 SET_DECL_RTL (decl
, x
);
1501 /* Optionally set flags or add text to the name to record information
1502 such as that it is a function name.
1503 If the name is changed, the macro ASM_OUTPUT_LABELREF
1504 will have to know how to strip this information. */
1505 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1508 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1509 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1513 make_decl_rtl_for_debug (tree decl
)
1515 unsigned int save_aliasing_flag
;
1518 if (DECL_RTL_SET_P (decl
))
1519 return DECL_RTL (decl
);
1521 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1522 call new_alias_set. If running with -fcompare-debug, sometimes
1523 we do not want to create alias sets that will throw the alias
1524 numbers off in the comparison dumps. So... clearing
1525 flag_strict_aliasing will keep new_alias_set() from creating a
1527 save_aliasing_flag
= flag_strict_aliasing
;
1528 flag_strict_aliasing
= 0;
1530 rtl
= DECL_RTL (decl
);
1531 /* Reset DECL_RTL back, as various parts of the compiler expects
1532 DECL_RTL set meaning it is actually going to be output. */
1533 SET_DECL_RTL (decl
, NULL
);
1535 flag_strict_aliasing
= save_aliasing_flag
;
1539 /* Output a string of literal assembler code
1540 for an `asm' keyword used between functions. */
1543 assemble_asm (tree string
)
1548 if (TREE_CODE (string
) == ADDR_EXPR
)
1549 string
= TREE_OPERAND (string
, 0);
1551 p
= TREE_STRING_POINTER (string
);
1552 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1555 /* Write the address of the entity given by SYMBOL to SEC. */
1557 assemble_addr_to_section (rtx symbol
, section
*sec
)
1559 switch_to_section (sec
);
1560 assemble_align (POINTER_SIZE
);
1561 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1564 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1565 not) section for PRIORITY. */
1567 get_cdtor_priority_section (int priority
, bool constructor_p
)
1569 /* Buffer conservatively large enough for the full range of a 32-bit
1570 int plus the text below. */
1573 /* ??? This only works reliably with the GNU linker. */
1574 sprintf (buf
, "%s.%.5u",
1575 constructor_p
? ".ctors" : ".dtors",
1576 /* Invert the numbering so the linker puts us in the proper
1577 order; constructors are run from right to left, and the
1578 linker sorts in increasing order. */
1579 MAX_INIT_PRIORITY
- priority
);
1580 return get_section (buf
, SECTION_WRITE
, NULL
);
1584 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1588 if (priority
!= DEFAULT_INIT_PRIORITY
)
1589 sec
= get_cdtor_priority_section (priority
,
1590 /*constructor_p=*/false);
1592 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1594 assemble_addr_to_section (symbol
, sec
);
1597 #ifdef DTORS_SECTION_ASM_OP
1599 default_dtor_section_asm_out_destructor (rtx symbol
,
1600 int priority ATTRIBUTE_UNUSED
)
1602 assemble_addr_to_section (symbol
, dtors_section
);
1607 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1611 if (priority
!= DEFAULT_INIT_PRIORITY
)
1612 sec
= get_cdtor_priority_section (priority
,
1613 /*constructor_p=*/true);
1615 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1617 assemble_addr_to_section (symbol
, sec
);
1620 #ifdef CTORS_SECTION_ASM_OP
1622 default_ctor_section_asm_out_constructor (rtx symbol
,
1623 int priority ATTRIBUTE_UNUSED
)
1625 assemble_addr_to_section (symbol
, ctors_section
);
1629 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1630 a nonzero value if the constant pool should be output before the
1631 start of the function, or a zero value if the pool should output
1632 after the end of the function. The default is to put it before the
1635 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1636 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1639 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1640 to be output to assembler.
1641 Set first_global_object_name and weak_global_object_name as appropriate. */
1644 notice_global_symbol (tree decl
)
1646 const char **t
= &first_global_object_name
;
1648 if (first_global_object_name
1649 || !TREE_PUBLIC (decl
)
1650 || DECL_EXTERNAL (decl
)
1651 || !DECL_NAME (decl
)
1652 || (VAR_P (decl
) && DECL_HARD_REGISTER (decl
))
1653 || (TREE_CODE (decl
) != FUNCTION_DECL
1655 || (DECL_COMMON (decl
)
1656 && (DECL_INITIAL (decl
) == 0
1657 || DECL_INITIAL (decl
) == error_mark_node
)))))
1660 /* We win when global object is found, but it is useful to know about weak
1661 symbol as well so we can produce nicer unique names. */
1662 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1663 t
= &weak_global_object_name
;
1667 tree id
= DECL_ASSEMBLER_NAME (decl
);
1668 ultimate_transparent_alias_target (&id
);
1669 *t
= ggc_strdup (targetm
.strip_name_encoding (IDENTIFIER_POINTER (id
)));
1673 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1674 current function goes into the cold section, so that targets can use
1675 current_function_section during RTL expansion. DECL describes the
1679 decide_function_section (tree decl
)
1681 first_function_block_is_cold
= false;
1683 if (DECL_SECTION_NAME (decl
))
1685 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1686 /* Calls to function_section rely on first_function_block_is_cold
1688 first_function_block_is_cold
= (node
1690 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1693 in_cold_section_p
= first_function_block_is_cold
;
1696 /* Get the function's name, as described by its RTL. This may be
1697 different from the DECL_NAME name used in the source file. */
1699 get_fnname_from_decl (tree decl
)
1701 rtx x
= DECL_RTL (decl
);
1702 gcc_assert (MEM_P (x
));
1704 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1708 /* Output assembler code for the constant pool of a function and associated
1709 with defining the name of the function. DECL describes the function.
1710 NAME is the function's name. For the constant pool, we use the current
1711 constant pool data. */
1714 assemble_start_function (tree decl
, const char *fnname
)
1717 char tmp_label
[100];
1718 bool hot_label_written
= false;
1720 if (crtl
->has_bb_partition
)
1722 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1723 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1724 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1725 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1726 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1727 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1728 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1729 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1731 cold_function_name
= NULL_TREE
;
1735 crtl
->subsections
.hot_section_label
= NULL
;
1736 crtl
->subsections
.cold_section_label
= NULL
;
1737 crtl
->subsections
.hot_section_end_label
= NULL
;
1738 crtl
->subsections
.cold_section_end_label
= NULL
;
1741 /* The following code does not need preprocessing in the assembler. */
1745 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1746 output_constant_pool (fnname
, decl
);
1748 align
= symtab_node::get (decl
)->definition_alignment ();
1750 /* Make sure the not and cold text (code) sections are properly
1751 aligned. This is necessary here in the case where the function
1752 has both hot and cold sections, because we don't want to re-set
1753 the alignment when the section switch happens mid-function. */
1755 if (crtl
->has_bb_partition
)
1757 first_function_block_is_cold
= false;
1759 switch_to_section (unlikely_text_section ());
1760 assemble_align (align
);
1761 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1763 /* When the function starts with a cold section, we need to explicitly
1764 align the hot section and write out the hot section label.
1765 But if the current function is a thunk, we do not have a CFG. */
1767 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1769 switch_to_section (text_section
);
1770 assemble_align (align
);
1771 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1772 hot_label_written
= true;
1773 first_function_block_is_cold
= true;
1775 in_cold_section_p
= first_function_block_is_cold
;
1779 /* Switch to the correct text section for the start of the function. */
1781 switch_to_section (function_section (decl
));
1782 if (crtl
->has_bb_partition
&& !hot_label_written
)
1783 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1785 /* Tell assembler to move to target machine's alignment for functions. */
1786 align
= floor_log2 (align
/ BITS_PER_UNIT
);
1789 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1792 /* Handle a user-specified function alignment.
1793 Note that we still need to align to DECL_ALIGN, as above,
1794 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1795 if (! DECL_USER_ALIGN (decl
)
1796 && align_functions_log
> align
1797 && optimize_function_for_speed_p (cfun
))
1799 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1800 int align_log
= align_functions_log
;
1802 int max_skip
= align_functions
- 1;
1803 if (flag_limit_function_alignment
&& crtl
->max_insn_address
> 0
1804 && max_skip
>= crtl
->max_insn_address
)
1805 max_skip
= crtl
->max_insn_address
- 1;
1807 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1808 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
, align_log
, max_skip
);
1810 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1814 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1815 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1818 if (!DECL_IGNORED_P (decl
))
1819 (*debug_hooks
->begin_function
) (decl
);
1821 /* Make function name accessible from other files, if appropriate. */
1823 if (TREE_PUBLIC (decl
)
1824 || (cgraph_node::get (decl
)->instrumentation_clone
1825 && cgraph_node::get (decl
)->instrumented_version
1826 && TREE_PUBLIC (cgraph_node::get (decl
)->instrumented_version
->decl
)))
1828 notice_global_symbol (decl
);
1830 globalize_decl (decl
);
1832 maybe_assemble_visibility (decl
);
1835 if (DECL_PRESERVE_P (decl
))
1836 targetm
.asm_out
.mark_decl_preserved (fnname
);
1838 unsigned HOST_WIDE_INT patch_area_size
= function_entry_patch_area_size
;
1839 unsigned HOST_WIDE_INT patch_area_entry
= function_entry_patch_area_start
;
1841 tree patchable_function_entry_attr
1842 = lookup_attribute ("patchable_function_entry", DECL_ATTRIBUTES (decl
));
1843 if (patchable_function_entry_attr
)
1845 tree pp_val
= TREE_VALUE (patchable_function_entry_attr
);
1846 tree patchable_function_entry_value1
= TREE_VALUE (pp_val
);
1848 if (tree_fits_uhwi_p (patchable_function_entry_value1
))
1849 patch_area_size
= tree_to_uhwi (patchable_function_entry_value1
);
1853 patch_area_entry
= 0;
1854 if (list_length (pp_val
) > 1)
1856 tree patchable_function_entry_value2
=
1857 TREE_VALUE (TREE_CHAIN (pp_val
));
1859 if (tree_fits_uhwi_p (patchable_function_entry_value2
))
1860 patch_area_entry
= tree_to_uhwi (patchable_function_entry_value2
);
1866 if (patch_area_entry
> patch_area_size
)
1868 if (patch_area_size
> 0)
1869 warning (OPT_Wattributes
, "Patchable function entry > size");
1870 patch_area_entry
= 0;
1873 /* Emit the patching area before the entry label, if any. */
1874 if (patch_area_entry
> 0)
1875 targetm
.asm_out
.print_patchable_function_entry (asm_out_file
,
1876 patch_area_entry
, true);
1878 /* Do any machine/system dependent processing of the function name. */
1879 #ifdef ASM_DECLARE_FUNCTION_NAME
1880 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1882 /* Standard thing is just output label for the function. */
1883 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1884 #endif /* ASM_DECLARE_FUNCTION_NAME */
1886 /* And the area after the label. Record it if we haven't done so yet. */
1887 if (patch_area_size
> patch_area_entry
)
1888 targetm
.asm_out
.print_patchable_function_entry (asm_out_file
,
1889 patch_area_size
-patch_area_entry
,
1890 patch_area_entry
== 0);
1892 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1893 saw_no_split_stack
= true;
1896 /* Output assembler code associated with defining the size of the
1897 function. DECL describes the function. NAME is the function's name. */
1900 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1902 #ifdef ASM_DECLARE_FUNCTION_SIZE
1903 /* We could have switched section in the middle of the function. */
1904 if (crtl
->has_bb_partition
)
1905 switch_to_section (function_section (decl
));
1906 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1908 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1910 output_constant_pool (fnname
, decl
);
1911 switch_to_section (function_section (decl
)); /* need to switch back */
1913 /* Output labels for end of hot/cold text sections (to be used by
1915 if (crtl
->has_bb_partition
)
1917 section
*save_text_section
;
1919 save_text_section
= in_section
;
1920 switch_to_section (unlikely_text_section ());
1921 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
1922 if (cold_function_name
!= NULL_TREE
)
1923 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file
,
1924 IDENTIFIER_POINTER (cold_function_name
),
1927 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1928 if (first_function_block_is_cold
)
1929 switch_to_section (text_section
);
1931 switch_to_section (function_section (decl
));
1932 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1933 switch_to_section (save_text_section
);
1937 /* Assemble code to leave SIZE bytes of zeros. */
1940 assemble_zeros (unsigned HOST_WIDE_INT size
)
1942 /* Do no output if -fsyntax-only. */
1943 if (flag_syntax_only
)
1946 #ifdef ASM_NO_SKIP_IN_TEXT
1947 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1948 so we must output 0s explicitly in the text section. */
1949 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1951 unsigned HOST_WIDE_INT i
;
1952 for (i
= 0; i
< size
; i
++)
1953 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1958 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1961 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1964 assemble_align (int align
)
1966 if (align
> BITS_PER_UNIT
)
1968 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1972 /* Assemble a string constant with the specified C string as contents. */
1975 assemble_string (const char *p
, int size
)
1980 /* If the string is very long, split it up. */
1984 int thissize
= size
- pos
;
1985 if (thissize
> maximum
)
1988 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1996 /* A noswitch_section_callback for lcomm_section. */
1999 emit_local (tree decl ATTRIBUTE_UNUSED
,
2000 const char *name ATTRIBUTE_UNUSED
,
2001 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2002 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2004 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
2005 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
2006 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
2009 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
2010 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
2011 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
2014 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2019 /* A noswitch_section_callback for bss_noswitch_section. */
2021 #if defined ASM_OUTPUT_ALIGNED_BSS
2023 emit_bss (tree decl ATTRIBUTE_UNUSED
,
2024 const char *name ATTRIBUTE_UNUSED
,
2025 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2026 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2028 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
2029 get_variable_align (decl
));
2034 /* A noswitch_section_callback for comm_section. */
2037 emit_common (tree decl ATTRIBUTE_UNUSED
,
2038 const char *name ATTRIBUTE_UNUSED
,
2039 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2040 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2042 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
2043 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
2044 size
, get_variable_align (decl
));
2046 #elif defined ASM_OUTPUT_ALIGNED_COMMON
2047 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
2048 get_variable_align (decl
));
2051 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
2056 /* A noswitch_section_callback for tls_comm_section. */
2059 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
2060 const char *name ATTRIBUTE_UNUSED
,
2061 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2062 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2064 #ifdef ASM_OUTPUT_TLS_COMMON
2065 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2068 sorry ("thread-local COMMON data not implemented");
2073 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2074 NAME is the name of DECL's SYMBOL_REF. */
2077 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2080 unsigned HOST_WIDE_INT size
, rounded
;
2082 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2085 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2086 size
+= asan_red_zone_size (size
);
2088 /* Don't allocate zero bytes of common,
2089 since that means "undefined external" in the linker. */
2093 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2094 so that each uninitialized object starts on such a boundary. */
2095 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2096 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2097 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2099 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2100 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2101 error ("requested alignment for %q+D is greater than "
2102 "implemented alignment of %wu", decl
, rounded
);
2105 /* A subroutine of assemble_variable. Output the label and contents of
2106 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2107 is as for assemble_variable. */
2110 assemble_variable_contents (tree decl
, const char *name
,
2111 bool dont_output_data
)
2113 /* Do any machine/system dependent processing of the object. */
2114 #ifdef ASM_DECLARE_OBJECT_NAME
2115 last_assemble_variable_decl
= decl
;
2116 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2118 /* Standard thing is just output label for the object. */
2119 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2120 #endif /* ASM_DECLARE_OBJECT_NAME */
2122 if (!dont_output_data
)
2124 /* Caller is supposed to use varpool_get_constructor when it wants
2125 to output the body. */
2126 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2127 if (DECL_INITIAL (decl
)
2128 && DECL_INITIAL (decl
) != error_mark_node
2129 && !initializer_zerop (DECL_INITIAL (decl
)))
2130 /* Output the actual data. */
2131 output_constant (DECL_INITIAL (decl
),
2132 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2133 get_variable_align (decl
),
2136 /* Leave space for it. */
2137 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2138 targetm
.asm_out
.decl_end ();
2142 /* Write out assembly for the variable DECL, which is not defined in
2143 the current translation unit. */
2145 assemble_undefined_decl (tree decl
)
2147 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2148 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2151 /* Assemble everything that is needed for a variable or function declaration.
2152 Not used for automatic variables, and not used for function definitions.
2153 Should not be called for variables of incomplete structure type.
2155 TOP_LEVEL is nonzero if this variable has file scope.
2156 AT_END is nonzero if this is the special handling, at end of compilation,
2157 to define things that have had only tentative definitions.
2158 DONT_OUTPUT_DATA if nonzero means don't actually output the
2159 initial value (that will be done by the caller). */
2162 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2163 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2166 rtx decl_rtl
, symbol
;
2169 bool asan_protected
= false;
2171 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2172 gcc_assert (VAR_P (decl
));
2174 /* Emulated TLS had better not get this far. */
2175 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2177 last_assemble_variable_decl
= 0;
2179 /* Normally no need to say anything here for external references,
2180 since assemble_external is called by the language-specific code
2181 when a declaration is first seen. */
2183 if (DECL_EXTERNAL (decl
))
2186 /* Do nothing for global register variables. */
2187 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2189 TREE_ASM_WRITTEN (decl
) = 1;
2193 /* If type was incomplete when the variable was declared,
2194 see if it is complete now. */
2196 if (DECL_SIZE (decl
) == 0)
2197 layout_decl (decl
, 0);
2199 /* Still incomplete => don't allocate it; treat the tentative defn
2200 (which is what it must have been) as an `extern' reference. */
2202 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2204 error ("storage size of %q+D isn%'t known", decl
);
2205 TREE_ASM_WRITTEN (decl
) = 1;
2209 /* The first declaration of a variable that comes through this function
2210 decides whether it is global (in C, has external linkage)
2211 or local (in C, has internal linkage). So do nothing more
2212 if this function has already run. */
2214 if (TREE_ASM_WRITTEN (decl
))
2217 /* Make sure targetm.encode_section_info is invoked before we set
2219 decl_rtl
= DECL_RTL (decl
);
2221 TREE_ASM_WRITTEN (decl
) = 1;
2223 /* Do no output if -fsyntax-only. */
2224 if (flag_syntax_only
)
2227 if (! dont_output_data
2228 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2230 error ("size of variable %q+D is too large", decl
);
2234 gcc_assert (MEM_P (decl_rtl
));
2235 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2236 symbol
= XEXP (decl_rtl
, 0);
2238 /* If this symbol belongs to the tree constant pool, output the constant
2239 if it hasn't already been written. */
2240 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2242 tree decl
= SYMBOL_REF_DECL (symbol
);
2243 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2244 output_constant_def_contents (symbol
);
2250 name
= XSTR (symbol
, 0);
2251 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2252 notice_global_symbol (decl
);
2254 /* Compute the alignment of this data. */
2256 align_variable (decl
, dont_output_data
);
2258 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2259 && asan_protect_global (decl
))
2261 asan_protected
= true;
2262 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
2263 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
2266 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2268 align
= get_variable_align (decl
);
2270 if (TREE_PUBLIC (decl
))
2271 maybe_assemble_visibility (decl
);
2273 if (DECL_PRESERVE_P (decl
))
2274 targetm
.asm_out
.mark_decl_preserved (name
);
2276 /* First make the assembler name(s) global if appropriate. */
2277 sect
= get_variable_section (decl
, false);
2278 if (TREE_PUBLIC (decl
)
2279 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2280 globalize_decl (decl
);
2282 /* Output any data that we will need to use the address of. */
2283 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2284 output_addressed_constants (DECL_INITIAL (decl
));
2286 /* dbxout.c needs to know this. */
2287 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2288 DECL_IN_TEXT_SECTION (decl
) = 1;
2290 /* If the decl is part of an object_block, make sure that the decl
2291 has been positioned within its block, but do not write out its
2292 definition yet. output_object_blocks will do that later. */
2293 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2295 gcc_assert (!dont_output_data
);
2296 place_block_symbol (symbol
);
2298 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2299 assemble_noswitch_variable (decl
, name
, sect
, align
);
2302 /* Special-case handling of vtv comdat sections. */
2303 if (sect
->named
.name
2304 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2305 handle_vtv_comdat_section (sect
, decl
);
2307 switch_to_section (sect
);
2308 if (align
> BITS_PER_UNIT
)
2309 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2310 assemble_variable_contents (decl
, name
, dont_output_data
);
2313 unsigned HOST_WIDE_INT
int size
2314 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2315 assemble_zeros (asan_red_zone_size (size
));
2321 /* Given a function declaration (FN_DECL), this function assembles the
2322 function into the .preinit_array section. */
2325 assemble_vtv_preinit_initializer (tree fn_decl
)
2328 unsigned flags
= SECTION_WRITE
;
2329 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2331 flags
|= SECTION_NOTYPE
;
2332 sect
= get_section (".preinit_array", flags
, fn_decl
);
2333 switch_to_section (sect
);
2334 assemble_addr_to_section (symbol
, sect
);
2337 /* Return 1 if type TYPE contains any pointers. */
2340 contains_pointers_p (tree type
)
2342 switch (TREE_CODE (type
))
2345 case REFERENCE_TYPE
:
2346 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2347 so I'll play safe and return 1. */
2353 case QUAL_UNION_TYPE
:
2356 /* For a type that has fields, see if the fields have pointers. */
2357 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2358 if (TREE_CODE (fields
) == FIELD_DECL
2359 && contains_pointers_p (TREE_TYPE (fields
)))
2365 /* An array type contains pointers if its element type does. */
2366 return contains_pointers_p (TREE_TYPE (type
));
2373 /* We delay assemble_external processing until
2374 the compilation unit is finalized. This is the best we can do for
2375 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2376 it all the way to final. See PR 17982 for further discussion. */
2377 static GTY(()) tree pending_assemble_externals
;
2379 #ifdef ASM_OUTPUT_EXTERNAL
2380 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2381 As a result, assemble_external can be called after the list of externals
2382 is processed and the pointer set destroyed. */
2383 static bool pending_assemble_externals_processed
;
2385 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2386 TREE_LIST in assemble_external. */
2387 static hash_set
<tree
> *pending_assemble_externals_set
;
2389 /* True if DECL is a function decl for which no out-of-line copy exists.
2390 It is assumed that DECL's assembler name has been set. */
2393 incorporeal_function_p (tree decl
)
2395 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2399 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2400 && ALLOCA_FUNCTION_CODE_P (DECL_FUNCTION_CODE (decl
)))
2403 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2404 /* Atomic or sync builtins which have survived this far will be
2405 resolved externally and therefore are not incorporeal. */
2406 if (strncmp (name
, "__builtin_", 10) == 0)
2412 /* Actually do the tests to determine if this is necessary, and invoke
2413 ASM_OUTPUT_EXTERNAL. */
2415 assemble_external_real (tree decl
)
2417 rtx rtl
= DECL_RTL (decl
);
2419 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2420 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2421 && !incorporeal_function_p (decl
))
2423 /* Some systems do require some output. */
2424 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2425 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2431 process_pending_assemble_externals (void)
2433 #ifdef ASM_OUTPUT_EXTERNAL
2435 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2436 assemble_external_real (TREE_VALUE (list
));
2438 pending_assemble_externals
= 0;
2439 pending_assemble_externals_processed
= true;
2440 delete pending_assemble_externals_set
;
2444 /* This TREE_LIST contains any weak symbol declarations waiting
2446 static GTY(()) tree weak_decls
;
2448 /* Output something to declare an external symbol to the assembler,
2449 and qualifiers such as weakness. (Most assemblers don't need
2450 extern declaration, so we normally output nothing.) Do nothing if
2451 DECL is not external. */
2454 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2456 /* Make sure that the ASM_OUT_FILE is open.
2457 If it's not, we should not be calling this function. */
2458 gcc_assert (asm_out_file
);
2460 /* In a perfect world, the following condition would be true.
2461 Sadly, the Go front end emit assembly *from the front end*,
2462 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2464 /* This function should only be called if we are expanding, or have
2466 Ideally, only final.c would be calling this function, but it is
2467 not clear whether that would break things somehow. See PR 17982
2468 for further discussion. */
2469 gcc_assert (state
== EXPANSION
2470 || state
== FINISHED
);
2473 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2476 /* We want to output annotation for weak and external symbols at
2477 very last to check if they are references or not. */
2479 if (TARGET_SUPPORTS_WEAK
2481 /* TREE_STATIC is a weird and abused creature which is not
2482 generally the right test for whether an entity has been
2483 locally emitted, inlined or otherwise not-really-extern, but
2484 for declarations that can be weak, it happens to be
2486 && !TREE_STATIC (decl
)
2487 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2488 && value_member (decl
, weak_decls
) == NULL_TREE
)
2489 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2491 #ifdef ASM_OUTPUT_EXTERNAL
2492 if (pending_assemble_externals_processed
)
2494 assemble_external_real (decl
);
2498 if (! pending_assemble_externals_set
->add (decl
))
2499 pending_assemble_externals
= tree_cons (NULL
, decl
,
2500 pending_assemble_externals
);
2504 /* Similar, for calling a library function FUN. */
2507 assemble_external_libcall (rtx fun
)
2509 /* Declare library function name external when first used, if nec. */
2510 if (! SYMBOL_REF_USED (fun
))
2512 SYMBOL_REF_USED (fun
) = 1;
2513 targetm
.asm_out
.external_libcall (fun
);
2517 /* Assemble a label named NAME. */
2520 assemble_label (FILE *file
, const char *name
)
2522 ASM_OUTPUT_LABEL (file
, name
);
2525 /* Set the symbol_referenced flag for ID. */
2527 mark_referenced (tree id
)
2529 TREE_SYMBOL_REFERENCED (id
) = 1;
2532 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2534 mark_decl_referenced (tree decl
)
2536 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2538 /* Extern inline functions don't become needed when referenced.
2539 If we know a method will be emitted in other TU and no new
2540 functions can be marked reachable, just use the external
2542 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2543 if (!DECL_EXTERNAL (decl
)
2544 && !node
->definition
)
2545 node
->mark_force_output ();
2547 else if (VAR_P (decl
))
2549 varpool_node
*node
= varpool_node::get_create (decl
);
2550 /* C++ frontend use mark_decl_references to force COMDAT variables
2551 to be output that might appear dead otherwise. */
2552 node
->force_output
= true;
2554 /* else do nothing - we can get various sorts of CST nodes here,
2555 which do not need to be marked. */
2559 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2560 starts with a *, the rest of NAME is output verbatim. Otherwise
2561 NAME is transformed in a target-specific way (usually by the
2562 addition of an underscore). */
2565 assemble_name_raw (FILE *file
, const char *name
)
2568 fputs (&name
[1], file
);
2570 ASM_OUTPUT_LABELREF (file
, name
);
2573 /* Like assemble_name_raw, but should be used when NAME might refer to
2574 an entity that is also represented as a tree (like a function or
2575 variable). If NAME does refer to such an entity, that entity will
2576 be marked as referenced. */
2579 assemble_name (FILE *file
, const char *name
)
2581 const char *real_name
;
2584 real_name
= targetm
.strip_name_encoding (name
);
2586 id
= maybe_get_identifier (real_name
);
2591 mark_referenced (id
);
2592 ultimate_transparent_alias_target (&id
);
2594 name
= IDENTIFIER_POINTER (id
);
2595 gcc_assert (! TREE_CHAIN (id
));
2598 assemble_name_raw (file
, name
);
2601 /* Allocate SIZE bytes writable static space with a gensym name
2602 and return an RTX to refer to its address. */
2605 assemble_static_space (unsigned HOST_WIDE_INT size
)
2608 const char *namestring
;
2611 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2613 namestring
= ggc_strdup (name
);
2615 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2616 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2618 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2619 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2622 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2623 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2626 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2627 so that each uninitialized object starts on such a boundary. */
2628 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2629 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2630 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2631 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2632 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2633 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2640 /* Assemble the static constant template for function entry trampolines.
2641 This is done at most once per compilation.
2642 Returns an RTX for the address of the template. */
2644 static GTY(()) rtx initial_trampoline
;
2647 assemble_trampoline_template (void)
2654 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2656 if (initial_trampoline
)
2657 return initial_trampoline
;
2659 /* By default, put trampoline templates in read-only data section. */
2661 #ifdef TRAMPOLINE_SECTION
2662 switch_to_section (TRAMPOLINE_SECTION
);
2664 switch_to_section (readonly_data_section
);
2667 /* Write the assembler code to define one. */
2668 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2670 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2672 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2673 targetm
.asm_out
.trampoline_template (asm_out_file
);
2675 /* Record the rtl to refer to it. */
2676 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2677 name
= ggc_strdup (label
);
2678 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2679 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2681 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2682 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2683 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2685 return initial_trampoline
;
2688 /* A and B are either alignments or offsets. Return the minimum alignment
2689 that may be assumed after adding the two together. */
2691 static inline unsigned
2692 min_align (unsigned int a
, unsigned int b
)
2694 return least_bit_hwi (a
| b
);
2697 /* Return the assembler directive for creating a given kind of integer
2698 object. SIZE is the number of bytes in the object and ALIGNED_P
2699 indicates whether it is known to be aligned. Return NULL if the
2700 assembly dialect has no such directive.
2702 The returned string should be printed at the start of a new line and
2703 be followed immediately by the object's initial value. */
2706 integer_asm_op (int size
, int aligned_p
)
2708 struct asm_int_op
*ops
;
2711 ops
= &targetm
.asm_out
.aligned_op
;
2713 ops
= &targetm
.asm_out
.unaligned_op
;
2718 return targetm
.asm_out
.byte_op
;
2732 /* Use directive OP to assemble an integer object X. Print OP at the
2733 start of the line, followed immediately by the value of X. */
2736 assemble_integer_with_op (const char *op
, rtx x
)
2738 fputs (op
, asm_out_file
);
2739 output_addr_const (asm_out_file
, x
);
2740 fputc ('\n', asm_out_file
);
2743 /* The default implementation of the asm_out.integer target hook. */
2746 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2747 unsigned int size ATTRIBUTE_UNUSED
,
2748 int aligned_p ATTRIBUTE_UNUSED
)
2750 const char *op
= integer_asm_op (size
, aligned_p
);
2751 /* Avoid GAS bugs for large values. Specifically negative values whose
2752 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2753 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2755 return op
&& (assemble_integer_with_op (op
, x
), true);
2758 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2759 the alignment of the integer in bits. Return 1 if we were able to output
2760 the constant, otherwise 0. We must be able to output the constant,
2761 if FORCE is nonzero. */
2764 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2768 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2770 /* See if the target hook can handle this kind of object. */
2771 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2774 /* If the object is a multi-byte one, try splitting it up. Split
2775 it into words it if is multi-word, otherwise split it into bytes. */
2778 machine_mode omode
, imode
;
2779 unsigned int subalign
;
2780 unsigned int subsize
, i
;
2781 enum mode_class mclass
;
2783 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2784 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2785 if (GET_CODE (x
) == CONST_FIXED
)
2786 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2790 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0).require ();
2791 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0).require ();
2793 for (i
= 0; i
< size
; i
+= subsize
)
2795 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2796 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2802 /* If we've printed some of it, but not all of it, there's no going
2807 gcc_assert (!force
);
2812 /* Assemble the floating-point constant D into an object of size MODE. ALIGN
2813 is the alignment of the constant in bits. If REVERSE is true, D is output
2814 in reverse storage order. */
2817 assemble_real (REAL_VALUE_TYPE d
, scalar_float_mode mode
, unsigned int align
,
2820 long data
[4] = {0, 0, 0, 0};
2821 int bitsize
, nelts
, nunits
, units_per
;
2824 /* This is hairy. We have a quantity of known size. real_to_target
2825 will put it into an array of *host* longs, 32 bits per element
2826 (even if long is more than 32 bits). We need to determine the
2827 number of array elements that are occupied (nelts) and the number
2828 of *target* min-addressable units that will be occupied in the
2829 object file (nunits). We cannot assume that 32 divides the
2830 mode's bitsize (size * BITS_PER_UNIT) evenly.
2832 size * BITS_PER_UNIT is used here to make sure that padding bits
2833 (which might appear at either end of the value; real_to_target
2834 will include the padding bits in its output array) are included. */
2836 nunits
= GET_MODE_SIZE (mode
);
2837 bitsize
= nunits
* BITS_PER_UNIT
;
2838 nelts
= CEIL (bitsize
, 32);
2839 units_per
= 32 / BITS_PER_UNIT
;
2841 real_to_target (data
, &d
, mode
);
2843 /* Put out the first word with the specified alignment. */
2845 elt
= flip_storage_order (SImode
, gen_int_mode (data
[nelts
- 1], SImode
));
2847 elt
= GEN_INT (data
[0]);
2848 assemble_integer (elt
, MIN (nunits
, units_per
), align
, 1);
2849 nunits
-= units_per
;
2851 /* Subsequent words need only 32-bit alignment. */
2852 align
= min_align (align
, 32);
2854 for (int i
= 1; i
< nelts
; i
++)
2857 elt
= flip_storage_order (SImode
,
2858 gen_int_mode (data
[nelts
- 1 - i
], SImode
));
2860 elt
= GEN_INT (data
[i
]);
2861 assemble_integer (elt
, MIN (nunits
, units_per
), align
, 1);
2862 nunits
-= units_per
;
2866 /* Given an expression EXP with a constant value,
2867 reduce it to the sum of an assembler symbol and an integer.
2868 Store them both in the structure *VALUE.
2869 EXP must be reducible. */
2877 decode_addr_const (tree exp
, struct addr_const
*value
)
2879 tree target
= TREE_OPERAND (exp
, 0);
2880 poly_int64 offset
= 0;
2886 if (TREE_CODE (target
) == COMPONENT_REF
2887 && poly_int_tree_p (byte_position (TREE_OPERAND (target
, 1)),
2891 target
= TREE_OPERAND (target
, 0);
2893 else if (TREE_CODE (target
) == ARRAY_REF
2894 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2896 /* Truncate big offset. */
2898 += (TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2899 * wi::to_poly_widest (TREE_OPERAND (target
, 1)).force_shwi ());
2900 target
= TREE_OPERAND (target
, 0);
2902 else if (TREE_CODE (target
) == MEM_REF
2903 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2905 offset
+= mem_ref_offset (target
).force_shwi ();
2906 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2908 else if (TREE_CODE (target
) == INDIRECT_REF
2909 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2910 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2912 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2917 switch (TREE_CODE (target
))
2921 x
= DECL_RTL (target
);
2925 x
= gen_rtx_MEM (FUNCTION_MODE
,
2926 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2935 x
= output_constant_def (target
, 1);
2939 /* This deals with absolute addresses. */
2940 offset
+= tree_to_shwi (TREE_OPERAND (target
, 0));
2941 x
= gen_rtx_MEM (QImode
,
2942 gen_rtx_SYMBOL_REF (Pmode
, "origin of addresses"));
2949 gcc_assert (MEM_P (x
));
2953 value
->offset
= offset
;
2956 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2958 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2960 /* Constant pool accessor function. */
2962 hash_table
<tree_descriptor_hasher
> *
2963 constant_pool_htab (void)
2965 return const_desc_htab
;
2968 /* Compute a hash code for a constant expression. */
2971 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2977 const_hash_1 (const tree exp
)
2982 enum tree_code code
= TREE_CODE (exp
);
2984 /* Either set P and LEN to the address and len of something to hash and
2985 exit the switch or return a value. */
2990 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2991 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2995 return real_hash (TREE_REAL_CST_PTR (exp
));
2998 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
3001 p
= TREE_STRING_POINTER (exp
);
3002 len
= TREE_STRING_LENGTH (exp
);
3006 return (const_hash_1 (TREE_REALPART (exp
)) * 5
3007 + const_hash_1 (TREE_IMAGPART (exp
)));
3011 hi
= 7 + VECTOR_CST_NPATTERNS (exp
);
3012 hi
= hi
* 563 + VECTOR_CST_NELTS_PER_PATTERN (exp
);
3013 unsigned int count
= vector_cst_encoded_nelts (exp
);
3014 for (unsigned int i
= 0; i
< count
; ++i
)
3015 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ENCODED_ELT (exp
, i
));
3021 unsigned HOST_WIDE_INT idx
;
3024 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
3026 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
3028 hi
= hi
* 603 + const_hash_1 (value
);
3036 struct addr_const value
;
3038 decode_addr_const (exp
, &value
);
3039 switch (GET_CODE (value
.base
))
3042 /* Don't hash the address of the SYMBOL_REF;
3043 only use the offset and the symbol name. */
3044 hi
= value
.offset
.coeffs
[0];
3045 p
= XSTR (value
.base
, 0);
3046 for (i
= 0; p
[i
] != 0; i
++)
3047 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3051 hi
= (value
.offset
.coeffs
[0]
3052 + CODE_LABEL_NUMBER (label_ref_label (value
.base
)) * 13);
3062 case POINTER_PLUS_EXPR
:
3064 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3065 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3068 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3071 /* A language specific constant. Just hash the code. */
3075 /* Compute hashing function. */
3077 for (i
= 0; i
< len
; i
++)
3078 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3083 /* Wrapper of compare_constant, for the htab interface. */
3085 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3086 constant_descriptor_tree
*c2
)
3088 if (c1
->hash
!= c2
->hash
)
3090 return compare_constant (c1
->value
, c2
->value
);
3093 /* Compare t1 and t2, and return 1 only if they are known to result in
3094 the same bit pattern on output. */
3097 compare_constant (const tree t1
, const tree t2
)
3099 enum tree_code typecode
;
3101 if (t1
== NULL_TREE
)
3102 return t2
== NULL_TREE
;
3103 if (t2
== NULL_TREE
)
3106 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3109 switch (TREE_CODE (t1
))
3112 /* Integer constants are the same only if the same width of type. */
3113 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3115 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3117 return tree_int_cst_equal (t1
, t2
);
3120 /* Real constants are the same only if the same width of type. In
3121 addition to the same width, we need to check whether the modes are the
3122 same. There might be two floating point modes that are the same size
3123 but have different representations, such as the PowerPC that has 2
3124 different 128-bit floating point types (IBM extended double and IEEE
3125 128-bit floating point). */
3126 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3128 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3130 return real_identical (&TREE_REAL_CST (t1
), &TREE_REAL_CST (t2
));
3133 /* Fixed constants are the same only if the same width of type. */
3134 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3137 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3140 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3143 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3144 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3145 TREE_STRING_LENGTH (t1
)));
3148 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3149 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3153 if (VECTOR_CST_NPATTERNS (t1
)
3154 != VECTOR_CST_NPATTERNS (t2
))
3157 if (VECTOR_CST_NELTS_PER_PATTERN (t1
)
3158 != VECTOR_CST_NELTS_PER_PATTERN (t2
))
3161 unsigned int count
= vector_cst_encoded_nelts (t1
);
3162 for (unsigned int i
= 0; i
< count
; ++i
)
3163 if (!compare_constant (VECTOR_CST_ENCODED_ELT (t1
, i
),
3164 VECTOR_CST_ENCODED_ELT (t2
, i
)))
3172 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3173 unsigned HOST_WIDE_INT idx
;
3175 typecode
= TREE_CODE (TREE_TYPE (t1
));
3176 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3179 if (typecode
== ARRAY_TYPE
)
3181 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3182 /* For arrays, check that mode, size and storage order match. */
3183 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3185 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
))
3186 || TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t1
))
3187 != TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t2
)))
3192 /* For record and union constructors, require exact type
3194 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3198 v1
= CONSTRUCTOR_ELTS (t1
);
3199 v2
= CONSTRUCTOR_ELTS (t2
);
3200 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3203 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3205 constructor_elt
*c1
= &(*v1
)[idx
];
3206 constructor_elt
*c2
= &(*v2
)[idx
];
3208 /* Check that each value is the same... */
3209 if (!compare_constant (c1
->value
, c2
->value
))
3211 /* ... and that they apply to the same fields! */
3212 if (typecode
== ARRAY_TYPE
)
3214 if (!compare_constant (c1
->index
, c2
->index
))
3219 if (c1
->index
!= c2
->index
)
3230 struct addr_const value1
, value2
;
3234 decode_addr_const (t1
, &value1
);
3235 decode_addr_const (t2
, &value2
);
3237 if (maybe_ne (value1
.offset
, value2
.offset
))
3240 code
= GET_CODE (value1
.base
);
3241 if (code
!= GET_CODE (value2
.base
))
3247 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3251 ret
= (CODE_LABEL_NUMBER (label_ref_label (value1
.base
))
3252 == CODE_LABEL_NUMBER (label_ref_label (value2
.base
)));
3262 case POINTER_PLUS_EXPR
:
3265 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3266 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3269 case VIEW_CONVERT_EXPR
:
3270 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3279 /* Return the section into which constant EXP should be placed. */
3282 get_constant_section (tree exp
, unsigned int align
)
3284 return targetm
.asm_out
.select_section (exp
,
3285 compute_reloc_for_constant (exp
),
3289 /* Return the size of constant EXP in bytes. */
3291 static HOST_WIDE_INT
3292 get_constant_size (tree exp
)
3296 size
= int_size_in_bytes (TREE_TYPE (exp
));
3297 if (TREE_CODE (exp
) == STRING_CST
)
3298 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3302 /* Subroutine of output_constant_def:
3303 No constant equal to EXP is known to have been output.
3304 Make a constant descriptor to enter EXP in the hash table.
3305 Assign the label number and construct RTL to refer to the
3306 constant's location in memory.
3307 Caller is responsible for updating the hash table. */
3309 static struct constant_descriptor_tree
*
3310 build_constant_desc (tree exp
)
3312 struct constant_descriptor_tree
*desc
;
3318 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3321 /* Create a string containing the label name, in LABEL. */
3322 labelno
= const_labelno
++;
3323 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3325 /* Construct the VAR_DECL associated with the constant. */
3326 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3328 DECL_ARTIFICIAL (decl
) = 1;
3329 DECL_IGNORED_P (decl
) = 1;
3330 TREE_READONLY (decl
) = 1;
3331 TREE_STATIC (decl
) = 1;
3332 TREE_ADDRESSABLE (decl
) = 1;
3333 /* We don't set the RTL yet as this would cause varpool to assume that the
3334 variable is referenced. Moreover, it would just be dropped in LTO mode.
3335 Instead we set the flag that will be recognized in make_decl_rtl. */
3336 DECL_IN_CONSTANT_POOL (decl
) = 1;
3337 DECL_INITIAL (decl
) = desc
->value
;
3338 /* ??? targetm.constant_alignment hasn't been updated for vector types on
3339 most architectures so use DATA_ALIGNMENT as well, except for strings. */
3340 if (TREE_CODE (exp
) == STRING_CST
)
3341 SET_DECL_ALIGN (decl
, targetm
.constant_alignment (exp
, DECL_ALIGN (decl
)));
3343 align_variable (decl
, 0);
3345 /* Now construct the SYMBOL_REF and the MEM. */
3346 if (use_object_blocks_p ())
3348 int align
= (TREE_CODE (decl
) == CONST_DECL
3349 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3351 : symtab_node::get (decl
)->definition_alignment ());
3352 section
*sect
= get_constant_section (exp
, align
);
3353 symbol
= create_block_symbol (ggc_strdup (label
),
3354 get_block_for_section (sect
), -1);
3357 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3358 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3359 SET_SYMBOL_REF_DECL (symbol
, decl
);
3360 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3362 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3363 set_mem_attributes (rtl
, exp
, 1);
3364 set_mem_alias_set (rtl
, 0);
3366 /* Putting EXP into the literal pool might have imposed a different
3367 alignment which should be visible in the RTX as well. */
3368 set_mem_align (rtl
, DECL_ALIGN (decl
));
3370 /* We cannot share RTX'es in pool entries.
3371 Mark this piece of RTL as required for unsharing. */
3372 RTX_FLAG (rtl
, used
) = 1;
3374 /* Set flags or add text to the name to record information, such as
3375 that it is a local symbol. If the name is changed, the macro
3376 ASM_OUTPUT_LABELREF will have to know how to strip this
3377 information. This call might invalidate our local variable
3378 SYMBOL; we can't use it afterward. */
3379 targetm
.encode_section_info (exp
, rtl
, true);
3386 /* Return an rtx representing a reference to constant data in memory
3387 for the constant expression EXP.
3389 If assembler code for such a constant has already been output,
3390 return an rtx to refer to it.
3391 Otherwise, output such a constant in memory
3392 and generate an rtx for it.
3394 If DEFER is nonzero, this constant can be deferred and output only
3395 if referenced in the function after all optimizations.
3397 `const_desc_table' records which constants already have label strings. */
3400 output_constant_def (tree exp
, int defer
)
3402 struct constant_descriptor_tree
*desc
;
3403 struct constant_descriptor_tree key
;
3405 /* Look up EXP in the table of constant descriptors. If we didn't find
3406 it, create a new one. */
3408 key
.hash
= const_hash_1 (exp
);
3409 constant_descriptor_tree
**loc
3410 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3415 desc
= build_constant_desc (exp
);
3416 desc
->hash
= key
.hash
;
3420 maybe_output_constant_def_contents (desc
, defer
);
3424 /* Subroutine of output_constant_def: Decide whether or not we need to
3425 output the constant DESC now, and if so, do it. */
3427 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3430 rtx symbol
= XEXP (desc
->rtl
, 0);
3431 tree exp
= desc
->value
;
3433 if (flag_syntax_only
)
3436 if (TREE_ASM_WRITTEN (exp
))
3437 /* Already output; don't do it again. */
3440 /* We can always defer constants as long as the context allows
3444 /* Increment n_deferred_constants if it exists. It needs to be at
3445 least as large as the number of constants actually referred to
3446 by the function. If it's too small we'll stop looking too early
3447 and fail to emit constants; if it's too large we'll only look
3448 through the entire function when we could have stopped earlier. */
3450 n_deferred_constants
++;
3454 output_constant_def_contents (symbol
);
3457 /* Subroutine of output_constant_def_contents. Output the definition
3458 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3459 constant's alignment in bits. */
3462 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3466 size
= get_constant_size (exp
);
3468 /* Do any machine/system dependent processing of the constant. */
3469 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3471 /* Output the value of EXP. */
3472 output_constant (exp
, size
, align
, false);
3474 targetm
.asm_out
.decl_end ();
3477 /* We must output the constant data referred to by SYMBOL; do so. */
3480 output_constant_def_contents (rtx symbol
)
3482 tree decl
= SYMBOL_REF_DECL (symbol
);
3483 tree exp
= DECL_INITIAL (decl
);
3484 bool asan_protected
= false;
3486 /* Make sure any other constants whose addresses appear in EXP
3487 are assigned label numbers. */
3488 output_addressed_constants (exp
);
3490 /* We are no longer deferring this constant. */
3491 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3493 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3494 && TREE_CODE (exp
) == STRING_CST
3495 && asan_protect_global (exp
))
3497 asan_protected
= true;
3498 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
3499 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
3502 /* If the constant is part of an object block, make sure that the
3503 decl has been positioned within its block, but do not write out
3504 its definition yet. output_object_blocks will do that later. */
3505 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3506 place_block_symbol (symbol
);
3509 int align
= (TREE_CODE (decl
) == CONST_DECL
3510 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3512 : symtab_node::get (decl
)->definition_alignment ());
3513 switch_to_section (get_constant_section (exp
, align
));
3514 if (align
> BITS_PER_UNIT
)
3515 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3516 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3519 HOST_WIDE_INT size
= get_constant_size (exp
);
3520 assemble_zeros (asan_red_zone_size (size
));
3525 /* Look up EXP in the table of constant descriptors. Return the rtl
3526 if it has been emitted, else null. */
3529 lookup_constant_def (tree exp
)
3531 struct constant_descriptor_tree key
;
3534 key
.hash
= const_hash_1 (exp
);
3535 constant_descriptor_tree
*desc
3536 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3538 return (desc
? desc
->rtl
: NULL_RTX
);
3541 /* Return a tree representing a reference to constant data in memory
3542 for the constant expression EXP.
3544 This is the counterpart of output_constant_def at the Tree level. */
3547 tree_output_constant_def (tree exp
)
3549 struct constant_descriptor_tree
*desc
, key
;
3552 /* Look up EXP in the table of constant descriptors. If we didn't find
3553 it, create a new one. */
3555 key
.hash
= const_hash_1 (exp
);
3556 constant_descriptor_tree
**loc
3557 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3562 desc
= build_constant_desc (exp
);
3563 desc
->hash
= key
.hash
;
3567 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3568 varpool_node::finalize_decl (decl
);
3572 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3573 struct constant_descriptor_rtx
*next
;
3577 HOST_WIDE_INT offset
;
3579 fixed_size_mode mode
;
3585 struct const_rtx_desc_hasher
: ggc_ptr_hash
<constant_descriptor_rtx
>
3587 static hashval_t
hash (constant_descriptor_rtx
*);
3588 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3591 /* Used in the hash tables to avoid outputting the same constant
3592 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3593 are output once per function, not once per file. */
3594 /* ??? Only a few targets need per-function constant pools. Most
3595 can use one per-file pool. Should add a targetm bit to tell the
3598 struct GTY(()) rtx_constant_pool
{
3599 /* Pointers to first and last constant in pool, as ordered by offset. */
3600 struct constant_descriptor_rtx
*first
;
3601 struct constant_descriptor_rtx
*last
;
3603 /* Hash facility for making memory-constants from constant rtl-expressions.
3604 It is used on RISC machines where immediate integer arguments and
3605 constant addresses are restricted so that such constants must be stored
3607 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3609 /* Current offset in constant pool (does not include any
3610 machine-specific header). */
3611 HOST_WIDE_INT offset
;
3614 /* Hash and compare functions for const_rtx_htab. */
3617 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3623 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3624 constant_descriptor_rtx
*y
)
3626 if (x
->mode
!= y
->mode
)
3628 return rtx_equal_p (x
->constant
, y
->constant
);
3631 /* Hash one component of a constant. */
3634 const_rtx_hash_1 (const_rtx x
)
3636 unsigned HOST_WIDE_INT hwi
;
3642 code
= GET_CODE (x
);
3643 mode
= GET_MODE (x
);
3644 h
= (hashval_t
) code
* 1048573 + mode
;
3653 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3654 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3656 h
^= (hashval_t
) hwi
;
3657 for (i
= 1; i
< n
; ++i
)
3660 h
^= (hashval_t
) hwi
;
3665 case CONST_WIDE_INT
:
3668 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3669 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3674 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3676 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3680 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3684 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3688 h
^= htab_hash_string (XSTR (x
, 0));
3692 h
= h
* 251 + CODE_LABEL_NUMBER (label_ref_label (x
));
3696 case UNSPEC_VOLATILE
:
3697 h
= h
* 251 + XINT (x
, 1);
3707 /* Compute a hash value for X, which should be a constant. */
3710 const_rtx_hash (rtx x
)
3713 subrtx_iterator::array_type array
;
3714 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3715 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3720 /* Create and return a new rtx constant pool. */
3722 static struct rtx_constant_pool
*
3723 create_constant_pool (void)
3725 struct rtx_constant_pool
*pool
;
3727 pool
= ggc_alloc
<rtx_constant_pool
> ();
3728 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3735 /* Initialize constant pool hashing for a new function. */
3738 init_varasm_status (void)
3740 crtl
->varasm
.pool
= create_constant_pool ();
3741 crtl
->varasm
.deferred_constants
= 0;
3744 /* Given a MINUS expression, simplify it if both sides
3745 include the same symbol. */
3748 simplify_subtraction (rtx x
)
3750 rtx r
= simplify_rtx (x
);
3754 /* Given a constant rtx X, make (or find) a memory constant for its value
3755 and return a MEM rtx to refer to it in memory. IN_MODE is the mode
3759 force_const_mem (machine_mode in_mode
, rtx x
)
3761 struct constant_descriptor_rtx
*desc
, tmp
;
3762 struct rtx_constant_pool
*pool
;
3767 constant_descriptor_rtx
**slot
;
3768 fixed_size_mode mode
;
3770 /* We can't force variable-sized objects to memory. */
3771 if (!is_a
<fixed_size_mode
> (in_mode
, &mode
))
3774 /* If we're not allowed to drop X into the constant pool, don't. */
3775 if (targetm
.cannot_force_const_mem (mode
, x
))
3778 /* Record that this function has used a constant pool entry. */
3779 crtl
->uses_const_pool
= 1;
3781 /* Decide which pool to use. */
3782 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3783 ? shared_constant_pool
3784 : crtl
->varasm
.pool
);
3786 /* Lookup the value in the hashtable. */
3789 hash
= const_rtx_hash (x
);
3790 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3793 /* If the constant was already present, return its memory. */
3795 return copy_rtx (desc
->mem
);
3797 /* Otherwise, create a new descriptor. */
3798 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3801 /* Align the location counter as required by EXP's data type. */
3802 machine_mode align_mode
= (mode
== VOIDmode
? word_mode
: mode
);
3803 align
= targetm
.static_rtx_alignment (align_mode
);
3805 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3806 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3809 desc
->constant
= copy_rtx (tmp
.constant
);
3810 desc
->offset
= pool
->offset
;
3813 desc
->align
= align
;
3814 desc
->labelno
= const_labelno
;
3817 pool
->offset
+= GET_MODE_SIZE (mode
);
3819 pool
->last
->next
= desc
;
3821 pool
->first
= pool
->last
= desc
;
3824 /* Create a string containing the label name, in LABEL. */
3825 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3828 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3829 the constants pool. */
3830 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3832 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3833 symbol
= create_block_symbol (ggc_strdup (label
),
3834 get_block_for_section (sect
), -1);
3837 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3839 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3840 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3841 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3843 /* Construct the MEM. */
3844 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3845 set_mem_align (def
, align
);
3847 /* If we're dropping a label to the constant pool, make sure we
3849 if (GET_CODE (x
) == LABEL_REF
)
3850 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3852 return copy_rtx (def
);
3855 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3858 get_pool_constant (const_rtx addr
)
3860 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3863 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3864 and whether it has been output or not. */
3867 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3869 struct constant_descriptor_rtx
*desc
;
3871 desc
= SYMBOL_REF_CONSTANT (addr
);
3872 *pmarked
= (desc
->mark
!= 0);
3873 return desc
->constant
;
3876 /* Similar, return the mode. */
3879 get_pool_mode (const_rtx addr
)
3881 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3884 /* Return TRUE if and only if the constant pool has no entries. Note
3885 that even entries we might end up choosing not to emit are counted
3886 here, so there is the potential for missed optimizations. */
3889 constant_pool_empty_p (void)
3891 return crtl
->varasm
.pool
->first
== NULL
;
3894 /* Worker function for output_constant_pool_1. Emit assembly for X
3895 in MODE with known alignment ALIGN. */
3898 output_constant_pool_2 (fixed_size_mode mode
, rtx x
, unsigned int align
)
3900 switch (GET_MODE_CLASS (mode
))
3903 case MODE_DECIMAL_FLOAT
:
3905 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3906 assemble_real (*CONST_DOUBLE_REAL_VALUE (x
),
3907 as_a
<scalar_float_mode
> (mode
), align
, false);
3912 case MODE_PARTIAL_INT
:
3917 case MODE_POINTER_BOUNDS
:
3918 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3921 case MODE_VECTOR_FLOAT
:
3922 case MODE_VECTOR_INT
:
3923 case MODE_VECTOR_FRACT
:
3924 case MODE_VECTOR_UFRACT
:
3925 case MODE_VECTOR_ACCUM
:
3926 case MODE_VECTOR_UACCUM
:
3929 scalar_mode submode
= GET_MODE_INNER (mode
);
3930 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3932 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3933 units
= GET_MODE_NUNITS (mode
);
3935 for (i
= 0; i
< units
; i
++)
3937 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3938 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3948 /* Worker function for output_constant_pool. Emit constant DESC,
3949 giving it ALIGN bits of alignment. */
3952 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3959 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3960 whose CODE_LABEL has been deleted. This can occur if a jump table
3961 is eliminated by optimization. If so, write a constant of zero
3962 instead. Note that this can also happen by turning the
3963 CODE_LABEL into a NOTE. */
3964 /* ??? This seems completely and utterly wrong. Certainly it's
3965 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3966 functioning even with rtx_insn::deleted and friends. */
3969 switch (GET_CODE (tmp
))
3972 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3973 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3975 tmp
= XEXP (XEXP (tmp
, 0), 0);
3980 rtx_insn
*insn
= label_ref_label (tmp
);
3981 gcc_assert (!insn
->deleted ());
3982 gcc_assert (!NOTE_P (insn
)
3983 || NOTE_KIND (insn
) != NOTE_INSN_DELETED
);
3991 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3992 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3993 align
, desc
->labelno
, done
);
3996 assemble_align (align
);
3998 /* Output the label. */
3999 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
4002 Pass actual alignment value while emitting string constant to asm code
4003 as function 'output_constant_pool_1' explicitly passes the alignment as 1
4004 assuming that the data is already aligned which prevents the generation
4005 of fix-up table entries. */
4006 output_constant_pool_2 (desc
->mode
, x
, desc
->align
);
4008 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
4009 sections have proper size. */
4010 if (align
> GET_MODE_BITSIZE (desc
->mode
)
4012 && (in_section
->common
.flags
& SECTION_MERGE
))
4013 assemble_align (align
);
4015 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
4021 /* Recompute the offsets of entries in POOL, and the overall size of
4022 POOL. Do this after calling mark_constant_pool to ensure that we
4023 are computing the offset values for the pool which we will actually
4027 recompute_pool_offsets (struct rtx_constant_pool
*pool
)
4029 struct constant_descriptor_rtx
*desc
;
4032 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4035 /* Recalculate offset. */
4036 unsigned int align
= desc
->align
;
4037 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
4038 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
4039 desc
->offset
= pool
->offset
;
4040 pool
->offset
+= GET_MODE_SIZE (desc
->mode
);
4044 /* Mark all constants that are referenced by SYMBOL_REFs in X.
4045 Emit referenced deferred strings. */
4048 mark_constants_in_pattern (rtx insn
)
4050 subrtx_iterator::array_type array
;
4051 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
4053 const_rtx x
= *iter
;
4054 if (GET_CODE (x
) == SYMBOL_REF
)
4056 if (CONSTANT_POOL_ADDRESS_P (x
))
4058 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
4059 if (desc
->mark
== 0)
4062 iter
.substitute (desc
->constant
);
4065 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
4067 tree decl
= SYMBOL_REF_DECL (x
);
4068 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
4070 n_deferred_constants
--;
4071 output_constant_def_contents (CONST_CAST_RTX (x
));
4078 /* Look through appropriate parts of INSN, marking all entries in the
4079 constant pool which are actually being used. Entries that are only
4080 referenced by other constants are also marked as used. Emit
4081 deferred strings that are used. */
4084 mark_constants (rtx_insn
*insn
)
4089 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4090 insns, not any notes that may be attached. We don't want to mark
4091 a constant just because it happens to appear in a REG_EQUIV note. */
4092 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4094 int i
, n
= seq
->len ();
4095 for (i
= 0; i
< n
; ++i
)
4097 rtx subinsn
= seq
->element (i
);
4098 if (INSN_P (subinsn
))
4099 mark_constants_in_pattern (subinsn
);
4103 mark_constants_in_pattern (insn
);
4106 /* Look through the instructions for this function, and mark all the
4107 entries in POOL which are actually being used. Emit deferred constants
4108 which have indeed been used. */
4111 mark_constant_pool (void)
4115 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4118 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4119 mark_constants (insn
);
4122 /* Write all the constants in POOL. */
4125 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4127 struct constant_descriptor_rtx
*desc
;
4129 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4132 /* If the constant is part of an object_block, make sure that
4133 the constant has been positioned within its block, but do not
4134 write out its definition yet. output_object_blocks will do
4136 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4137 && SYMBOL_REF_BLOCK (desc
->sym
))
4138 place_block_symbol (desc
->sym
);
4141 switch_to_section (targetm
.asm_out
.select_rtx_section
4142 (desc
->mode
, desc
->constant
, desc
->align
));
4143 output_constant_pool_1 (desc
, desc
->align
);
4148 /* Mark all constants that are used in the current function, then write
4149 out the function's private constant pool. */
4152 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4153 tree fndecl ATTRIBUTE_UNUSED
)
4155 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4157 /* It is possible for gcc to call force_const_mem and then to later
4158 discard the instructions which refer to the constant. In such a
4159 case we do not need to output the constant. */
4160 mark_constant_pool ();
4162 /* Having marked the constant pool entries we'll actually emit, we
4163 now need to rebuild the offset information, which may have become
4165 recompute_pool_offsets (pool
);
4167 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4168 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4171 output_constant_pool_contents (pool
);
4173 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4174 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4178 /* Write the contents of the shared constant pool. */
4181 output_shared_constant_pool (void)
4183 output_constant_pool_contents (shared_constant_pool
);
4186 /* Determine what kind of relocations EXP may need. */
4189 compute_reloc_for_constant (tree exp
)
4191 int reloc
= 0, reloc2
;
4194 switch (TREE_CODE (exp
))
4198 /* Go inside any operations that get_inner_reference can handle and see
4199 if what's inside is a constant: no need to do anything here for
4200 addresses of variables or functions. */
4201 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4202 tem
= TREE_OPERAND (tem
, 0))
4205 if (TREE_CODE (tem
) == MEM_REF
4206 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4208 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4212 if (!targetm
.binds_local_p (tem
))
4219 case POINTER_PLUS_EXPR
:
4220 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4221 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4225 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4226 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4227 /* The difference of two local labels is computable at link time. */
4228 if (reloc
== 1 && reloc2
== 1)
4235 case VIEW_CONVERT_EXPR
:
4236 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4241 unsigned HOST_WIDE_INT idx
;
4242 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4244 reloc
|= compute_reloc_for_constant (tem
);
4254 /* Find all the constants whose addresses are referenced inside of EXP,
4255 and make sure assembler code with a label has been output for each one.
4256 Indicate whether an ADDR_EXPR has been encountered. */
4259 output_addressed_constants (tree exp
)
4263 switch (TREE_CODE (exp
))
4267 /* Go inside any operations that get_inner_reference can handle and see
4268 if what's inside is a constant: no need to do anything here for
4269 addresses of variables or functions. */
4270 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4271 tem
= TREE_OPERAND (tem
, 0))
4274 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4275 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4276 tem
= DECL_INITIAL (tem
);
4278 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4279 output_constant_def (tem
, 0);
4281 if (TREE_CODE (tem
) == MEM_REF
)
4282 output_addressed_constants (TREE_OPERAND (tem
, 0));
4286 case POINTER_PLUS_EXPR
:
4288 output_addressed_constants (TREE_OPERAND (exp
, 1));
4292 case VIEW_CONVERT_EXPR
:
4293 output_addressed_constants (TREE_OPERAND (exp
, 0));
4298 unsigned HOST_WIDE_INT idx
;
4299 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4301 output_addressed_constants (tem
);
4310 /* Whether a constructor CTOR is a valid static constant initializer if all
4311 its elements are. This used to be internal to initializer_constant_valid_p
4312 and has been exposed to let other functions like categorize_ctor_elements
4313 evaluate the property while walking a constructor for other purposes. */
4316 constructor_static_from_elts_p (const_tree ctor
)
4318 return (TREE_CONSTANT (ctor
)
4319 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4320 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4321 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4324 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4327 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4328 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4329 which are valid when ENDTYPE is an integer of any size; in
4330 particular, this does not accept a pointer minus a constant. This
4331 returns null_pointer_node if the VALUE is an absolute constant
4332 which can be used to initialize a static variable. Otherwise it
4336 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4340 if (!INTEGRAL_TYPE_P (endtype
))
4343 op0
= TREE_OPERAND (value
, 0);
4344 op1
= TREE_OPERAND (value
, 1);
4346 /* Like STRIP_NOPS except allow the operand mode to widen. This
4347 works around a feature of fold that simplifies (int)(p1 - p2) to
4348 ((int)p1 - (int)p2) under the theory that the narrower operation
4351 while (CONVERT_EXPR_P (op0
)
4352 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4354 tree inner
= TREE_OPERAND (op0
, 0);
4355 if (inner
== error_mark_node
4356 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4357 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op0
)))
4358 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4363 while (CONVERT_EXPR_P (op1
)
4364 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4366 tree inner
= TREE_OPERAND (op1
, 0);
4367 if (inner
== error_mark_node
4368 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4369 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op1
)))
4370 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4375 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4379 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4380 cache
? cache
+ 2 : NULL
);
4381 /* Both initializers must be known. */
4385 && (op0
== null_pointer_node
4386 || TREE_CODE (value
) == MINUS_EXPR
))
4387 return null_pointer_node
;
4389 /* Support differences between labels. */
4390 if (TREE_CODE (op0
) == LABEL_DECL
4391 && TREE_CODE (op1
) == LABEL_DECL
)
4392 return null_pointer_node
;
4394 if (TREE_CODE (op0
) == STRING_CST
4395 && TREE_CODE (op1
) == STRING_CST
4396 && operand_equal_p (op0
, op1
, 1))
4397 return null_pointer_node
;
4403 /* Helper function of initializer_constant_valid_p.
4404 Return nonzero if VALUE is a valid constant-valued expression
4405 for use in initializing a static variable; one that can be an
4406 element of a "constant" initializer.
4408 Return null_pointer_node if the value is absolute;
4409 if it is relocatable, return the variable that determines the relocation.
4410 We assume that VALUE has been folded as much as possible;
4411 therefore, we do not need to check for such things as
4412 arithmetic-combinations of integers.
4414 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4417 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4421 switch (TREE_CODE (value
))
4424 if (constructor_static_from_elts_p (value
))
4426 unsigned HOST_WIDE_INT idx
;
4428 bool absolute
= true;
4430 if (cache
&& cache
[0] == value
)
4432 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4435 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4438 /* An absolute value is required with reverse SSO. */
4439 || (reloc
!= null_pointer_node
4440 && TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (value
))
4441 && !AGGREGATE_TYPE_P (TREE_TYPE (elt
))))
4446 cache
[1] = NULL_TREE
;
4450 if (reloc
!= null_pointer_node
)
4453 /* For a non-absolute relocation, there is no single
4454 variable that can be "the variable that determines the
4459 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4461 return absolute
? null_pointer_node
: error_mark_node
;
4464 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4472 return null_pointer_node
;
4477 tree op0
= staticp (TREE_OPERAND (value
, 0));
4480 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4481 to be a constant, this is old-skool offsetof-like nonsense. */
4482 if (TREE_CODE (op0
) == INDIRECT_REF
4483 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4484 return null_pointer_node
;
4485 /* Taking the address of a nested function involves a trampoline,
4486 unless we don't need or want one. */
4487 if (TREE_CODE (op0
) == FUNCTION_DECL
4488 && DECL_STATIC_CHAIN (op0
)
4489 && !TREE_NO_TRAMPOLINE (value
))
4491 /* "&{...}" requires a temporary to hold the constructed
4493 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4499 case NON_LVALUE_EXPR
:
4500 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4503 case VIEW_CONVERT_EXPR
:
4505 tree src
= TREE_OPERAND (value
, 0);
4506 tree src_type
= TREE_TYPE (src
);
4507 tree dest_type
= TREE_TYPE (value
);
4509 /* Allow view-conversions from aggregate to non-aggregate type only
4510 if the bit pattern is fully preserved afterwards; otherwise, the
4511 RTL expander won't be able to apply a subsequent transformation
4512 to the underlying constructor. */
4513 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4515 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4516 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4521 /* Allow all other kinds of view-conversion. */
4522 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4527 tree src
= TREE_OPERAND (value
, 0);
4528 tree src_type
= TREE_TYPE (src
);
4529 tree dest_type
= TREE_TYPE (value
);
4531 /* Allow conversions between pointer types, floating-point
4532 types, and offset types. */
4533 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4534 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4535 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4536 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4537 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4539 /* Allow length-preserving conversions between integer types. */
4540 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4541 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4542 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4544 /* Allow conversions between other integer types only if
4545 explicit value. Don't allow sign-extension to a type larger
4546 than word and pointer, there aren't relocations that would
4547 allow to sign extend it to a wider type. */
4548 if (INTEGRAL_TYPE_P (dest_type
)
4549 && INTEGRAL_TYPE_P (src_type
)
4550 && (TYPE_UNSIGNED (src_type
)
4551 || TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
)
4552 || TYPE_PRECISION (dest_type
) <= BITS_PER_WORD
4553 || TYPE_PRECISION (dest_type
) <= POINTER_SIZE
))
4555 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4556 if (inner
== null_pointer_node
)
4557 return null_pointer_node
;
4561 /* Allow (int) &foo provided int is as wide as a pointer. */
4562 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4563 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4564 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4566 /* Likewise conversions from int to pointers, but also allow
4567 conversions from 0. */
4568 if ((POINTER_TYPE_P (dest_type
)
4569 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4570 && INTEGRAL_TYPE_P (src_type
))
4572 if (TREE_CODE (src
) == INTEGER_CST
4573 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4574 return null_pointer_node
;
4575 if (integer_zerop (src
))
4576 return null_pointer_node
;
4577 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4578 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4581 /* Allow conversions to struct or union types if the value
4583 if (TREE_CODE (dest_type
) == RECORD_TYPE
4584 || TREE_CODE (dest_type
) == UNION_TYPE
)
4585 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4589 case POINTER_PLUS_EXPR
:
4591 /* Any valid floating-point constants will have been folded by now;
4592 with -frounding-math we hit this with addition of two constants. */
4593 if (TREE_CODE (endtype
) == REAL_TYPE
)
4595 if (cache
&& cache
[0] == value
)
4597 if (! INTEGRAL_TYPE_P (endtype
)
4598 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4600 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4602 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4605 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4606 endtype
, ncache
+ 2);
4607 /* If either term is absolute, use the other term's relocation. */
4608 if (valid0
== null_pointer_node
)
4610 else if (valid1
== null_pointer_node
)
4612 /* Support narrowing pointer differences. */
4614 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4618 /* Support narrowing pointer differences. */
4619 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4627 case POINTER_DIFF_EXPR
:
4629 if (TREE_CODE (endtype
) == REAL_TYPE
)
4631 if (cache
&& cache
[0] == value
)
4633 if (! INTEGRAL_TYPE_P (endtype
)
4634 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4636 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4638 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4641 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4642 endtype
, ncache
+ 2);
4643 /* Win if second argument is absolute. */
4644 if (valid1
== null_pointer_node
)
4646 /* Win if both arguments have the same relocation.
4647 Then the value is absolute. */
4648 else if (valid0
== valid1
&& valid0
!= 0)
4649 ret
= null_pointer_node
;
4650 /* Since GCC guarantees that string constants are unique in the
4651 generated code, a subtraction between two copies of the same
4652 constant string is absolute. */
4653 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4654 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4655 && operand_equal_p (valid0
, valid1
, 1))
4656 ret
= null_pointer_node
;
4657 /* Support narrowing differences. */
4659 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4663 /* Support narrowing differences. */
4664 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4679 /* Return nonzero if VALUE is a valid constant-valued expression
4680 for use in initializing a static variable; one that can be an
4681 element of a "constant" initializer.
4683 Return null_pointer_node if the value is absolute;
4684 if it is relocatable, return the variable that determines the relocation.
4685 We assume that VALUE has been folded as much as possible;
4686 therefore, we do not need to check for such things as
4687 arithmetic-combinations of integers. */
4689 initializer_constant_valid_p (tree value
, tree endtype
, bool reverse
)
4691 tree reloc
= initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4693 /* An absolute value is required with reverse storage order. */
4695 && reloc
!= null_pointer_node
4697 && !AGGREGATE_TYPE_P (endtype
)
4698 && !VECTOR_TYPE_P (endtype
))
4704 /* Return true if VALUE is a valid constant-valued expression
4705 for use in initializing a static bit-field; one that can be
4706 an element of a "constant" initializer. */
4709 initializer_constant_valid_for_bitfield_p (tree value
)
4711 /* For bitfields we support integer constants or possibly nested aggregates
4713 switch (TREE_CODE (value
))
4717 unsigned HOST_WIDE_INT idx
;
4720 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4721 if (!initializer_constant_valid_for_bitfield_p (elt
))
4730 case VIEW_CONVERT_EXPR
:
4731 case NON_LVALUE_EXPR
:
4733 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4742 /* output_constructor outer state of relevance in recursive calls, typically
4743 for nested aggregate bitfields. */
4745 struct oc_outer_state
{
4746 unsigned int bit_offset
; /* current position in ... */
4747 int byte
; /* ... the outer byte buffer. */
4750 static unsigned HOST_WIDE_INT
4751 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int, bool,
4754 /* Output assembler code for constant EXP, with no label.
4755 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4756 Assumes output_addressed_constants has been done on EXP already.
4758 Generate at least SIZE bytes of assembler data, padding at the end
4759 with zeros if necessary. SIZE must always be specified. The returned
4760 value is the actual number of bytes of assembler data generated, which
4761 may be bigger than SIZE if the object contains a variable length field.
4763 SIZE is important for structure constructors,
4764 since trailing members may have been omitted from the constructor.
4765 It is also important for initialization of arrays from string constants
4766 since the full length of the string constant might not be wanted.
4767 It is also needed for initialization of unions, where the initializer's
4768 type is just one member, and that may not be as long as the union.
4770 There a case in which we would fail to output exactly SIZE bytes:
4771 for a structure constructor that wants to produce more than SIZE bytes.
4772 But such constructors will never be generated for any possible input.
4774 ALIGN is the alignment of the data in bits.
4776 If REVERSE is true, EXP is output in reverse storage order. */
4778 static unsigned HOST_WIDE_INT
4779 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
4782 enum tree_code code
;
4783 unsigned HOST_WIDE_INT thissize
;
4786 if (size
== 0 || flag_syntax_only
)
4789 /* See if we're trying to initialize a pointer in a non-default mode
4790 to the address of some declaration somewhere. If the target says
4791 the mode is valid for pointers, assume the target has a way of
4793 if (TREE_CODE (exp
) == NOP_EXPR
4794 && POINTER_TYPE_P (TREE_TYPE (exp
))
4795 && targetm
.addr_space
.valid_pointer_mode
4796 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
4797 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4799 tree saved_type
= TREE_TYPE (exp
);
4801 /* Peel off any intermediate conversions-to-pointer for valid
4803 while (TREE_CODE (exp
) == NOP_EXPR
4804 && POINTER_TYPE_P (TREE_TYPE (exp
))
4805 && targetm
.addr_space
.valid_pointer_mode
4806 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
4807 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4808 exp
= TREE_OPERAND (exp
, 0);
4810 /* If what we're left with is the address of something, we can
4811 convert the address to the final type and output it that
4813 if (TREE_CODE (exp
) == ADDR_EXPR
)
4814 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4815 /* Likewise for constant ints. */
4816 else if (TREE_CODE (exp
) == INTEGER_CST
)
4817 exp
= fold_convert (saved_type
, exp
);
4821 /* Eliminate any conversions since we'll be outputting the underlying
4823 while (CONVERT_EXPR_P (exp
)
4824 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4825 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4827 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4828 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4830 /* Make sure eliminating the conversion is really a no-op, except with
4831 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4832 union types to allow for Ada unchecked unions. */
4833 if (type_size
> op_size
4834 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4835 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4836 /* Keep the conversion. */
4839 exp
= TREE_OPERAND (exp
, 0);
4842 code
= TREE_CODE (TREE_TYPE (exp
));
4843 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4845 /* Allow a constructor with no elements for any data type.
4846 This means to fill the space with zeros. */
4847 if (TREE_CODE (exp
) == CONSTRUCTOR
4848 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4850 assemble_zeros (size
);
4854 if (TREE_CODE (exp
) == FDESC_EXPR
)
4856 #ifdef ASM_OUTPUT_FDESC
4857 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4858 tree decl
= TREE_OPERAND (exp
, 0);
4859 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4866 /* Now output the underlying data. If we've handling the padding, return.
4867 Otherwise, break and ensure SIZE is the size written. */
4874 case REFERENCE_TYPE
:
4876 case FIXED_POINT_TYPE
:
4877 case POINTER_BOUNDS_TYPE
:
4879 cst
= expand_expr (exp
, NULL_RTX
, VOIDmode
, EXPAND_INITIALIZER
);
4881 cst
= flip_storage_order (TYPE_MODE (TREE_TYPE (exp
)), cst
);
4882 if (!assemble_integer (cst
, MIN (size
, thissize
), align
, 0))
4883 error ("initializer for integer/fixed-point value is too complicated");
4887 if (TREE_CODE (exp
) != REAL_CST
)
4888 error ("initializer for floating value is not a floating constant");
4890 assemble_real (TREE_REAL_CST (exp
),
4891 SCALAR_FLOAT_TYPE_MODE (TREE_TYPE (exp
)),
4896 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
, reverse
);
4897 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4898 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)),
4904 switch (TREE_CODE (exp
))
4907 return output_constructor (exp
, size
, align
, reverse
, NULL
);
4910 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4911 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4915 scalar_mode inner
= SCALAR_TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4916 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4917 int elt_size
= GET_MODE_SIZE (inner
);
4918 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
,
4920 thissize
= elt_size
;
4921 /* Static constants must have a fixed size. */
4922 unsigned int nunits
= VECTOR_CST_NELTS (exp
).to_constant ();
4923 for (unsigned int i
= 1; i
< nunits
; i
++)
4925 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
,
4927 thissize
+= elt_size
;
4938 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4939 return output_constructor (exp
, size
, align
, reverse
, NULL
);
4948 if (size
> thissize
)
4949 assemble_zeros (size
- thissize
);
4954 /* Subroutine of output_constructor, used for computing the size of
4955 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4956 type with an unspecified upper bound. */
4958 static unsigned HOST_WIDE_INT
4959 array_size_for_constructor (tree val
)
4962 unsigned HOST_WIDE_INT cnt
;
4963 tree index
, value
, tmp
;
4966 /* This code used to attempt to handle string constants that are not
4967 arrays of single-bytes, but nothing else does, so there's no point in
4969 if (TREE_CODE (val
) == STRING_CST
)
4970 return TREE_STRING_LENGTH (val
);
4972 max_index
= NULL_TREE
;
4973 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4975 if (TREE_CODE (index
) == RANGE_EXPR
)
4976 index
= TREE_OPERAND (index
, 1);
4977 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4981 if (max_index
== NULL_TREE
)
4984 /* Compute the total number of array elements. */
4985 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4986 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4988 /* Multiply by the array element unit size to find number of bytes. */
4989 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4991 gcc_assert (wi::fits_uhwi_p (i
));
4992 return i
.to_uhwi ();
4995 /* Other datastructures + helpers for output_constructor. */
4997 /* output_constructor local state to support interaction with helpers. */
4999 struct oc_local_state
{
5001 /* Received arguments. */
5002 tree exp
; /* Constructor expression. */
5003 tree type
; /* Type of constructor expression. */
5004 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
5005 unsigned int align
; /* Known initial alignment. */
5006 tree min_index
; /* Lower bound if specified for an array. */
5008 /* Output processing state. */
5009 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
5010 int byte
; /* Part of a bitfield byte yet to be output. */
5011 int last_relative_index
; /* Implicit or explicit index of the last
5012 array element output within a bitfield. */
5013 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
5014 bool reverse
; /* Whether reverse storage order is in use. */
5016 /* Current element. */
5017 tree field
; /* Current field decl in a record. */
5018 tree val
; /* Current element value. */
5019 tree index
; /* Current element index. */
5023 /* Helper for output_constructor. From the current LOCAL state, output a
5024 RANGE_EXPR element. */
5027 output_constructor_array_range (oc_local_state
*local
)
5029 unsigned HOST_WIDE_INT fieldsize
5030 = int_size_in_bytes (TREE_TYPE (local
->type
));
5032 HOST_WIDE_INT lo_index
5033 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
5034 HOST_WIDE_INT hi_index
5035 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
5036 HOST_WIDE_INT index
;
5039 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
5041 for (index
= lo_index
; index
<= hi_index
; index
++)
5043 /* Output the element's initial value. */
5044 if (local
->val
== NULL_TREE
)
5045 assemble_zeros (fieldsize
);
5048 = output_constant (local
->val
, fieldsize
, align2
, local
->reverse
);
5050 /* Count its size. */
5051 local
->total_bytes
+= fieldsize
;
5055 /* Helper for output_constructor. From the current LOCAL state, output a
5056 field element that is not true bitfield or part of an outer one. */
5059 output_constructor_regular_field (oc_local_state
*local
)
5061 /* Field size and position. Since this structure is static, we know the
5062 positions are constant. */
5063 unsigned HOST_WIDE_INT fieldsize
;
5064 HOST_WIDE_INT fieldpos
;
5066 unsigned int align2
;
5068 /* Output any buffered-up bit-fields preceding this element. */
5069 if (local
->byte_buffer_in_use
)
5071 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5072 local
->total_bytes
++;
5073 local
->byte_buffer_in_use
= false;
5076 if (local
->index
!= NULL_TREE
)
5078 /* Perform the index calculation in modulo arithmetic but
5079 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
5080 but we are using an unsigned sizetype. */
5081 unsigned prec
= TYPE_PRECISION (sizetype
);
5082 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
5083 - wi::to_offset (local
->min_index
), prec
);
5084 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
5087 else if (local
->field
!= NULL_TREE
)
5088 fieldpos
= int_byte_position (local
->field
);
5092 /* Advance to offset of this element.
5093 Note no alignment needed in an array, since that is guaranteed
5094 if each element has the proper size. */
5095 if (local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
5097 if (fieldpos
> local
->total_bytes
)
5099 assemble_zeros (fieldpos
- local
->total_bytes
);
5100 local
->total_bytes
= fieldpos
;
5103 /* Must not go backwards. */
5104 gcc_assert (fieldpos
== local
->total_bytes
);
5107 /* Find the alignment of this element. */
5108 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
5110 /* Determine size this element should occupy. */
5115 /* If this is an array with an unspecified upper bound,
5116 the initializer determines the size. */
5117 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5118 but we cannot do this until the deprecated support for
5119 initializing zero-length array members is removed. */
5120 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
5121 && (!TYPE_DOMAIN (TREE_TYPE (local
->field
))
5122 || !TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
)))))
5124 fieldsize
= array_size_for_constructor (local
->val
);
5125 /* Given a non-empty initialization, this field had better
5126 be last. Given a flexible array member, the next field
5127 on the chain is a TYPE_DECL of the enclosing struct. */
5128 const_tree next
= DECL_CHAIN (local
->field
);
5129 gcc_assert (!fieldsize
|| !next
|| TREE_CODE (next
) != FIELD_DECL
);
5132 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5135 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5137 /* Output the element's initial value. */
5138 if (local
->val
== NULL_TREE
)
5139 assemble_zeros (fieldsize
);
5142 = output_constant (local
->val
, fieldsize
, align2
, local
->reverse
);
5144 /* Count its size. */
5145 local
->total_bytes
+= fieldsize
;
5148 /* Helper for output_constructor. From the LOCAL state, output an element
5149 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5150 from the start of a possibly ongoing outer byte buffer. */
5153 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5155 /* Bit size of this element. */
5156 HOST_WIDE_INT ebitsize
5158 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5159 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5161 /* Relative index of this element if this is an array component. */
5162 HOST_WIDE_INT relative_index
5165 ? (tree_to_shwi (local
->index
)
5166 - tree_to_shwi (local
->min_index
))
5167 : local
->last_relative_index
+ 1)
5170 /* Bit position of this element from the start of the containing
5172 HOST_WIDE_INT constructor_relative_ebitpos
5174 ? int_bit_position (local
->field
)
5175 : ebitsize
* relative_index
);
5177 /* Bit position of this element from the start of a possibly ongoing
5178 outer byte buffer. */
5179 HOST_WIDE_INT byte_relative_ebitpos
5180 = bit_offset
+ constructor_relative_ebitpos
;
5182 /* From the start of a possibly ongoing outer byte buffer, offsets to
5183 the first bit of this element and to the first bit past the end of
5185 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5186 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5188 local
->last_relative_index
= relative_index
;
5190 if (local
->val
== NULL_TREE
)
5191 local
->val
= integer_zero_node
;
5193 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5194 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5195 local
->val
= TREE_OPERAND (local
->val
, 0);
5197 if (TREE_CODE (local
->val
) != INTEGER_CST
5198 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5200 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5204 /* If this field does not start in this (or next) byte, skip some bytes. */
5205 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5207 /* Output remnant of any bit field in previous bytes. */
5208 if (local
->byte_buffer_in_use
)
5210 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5211 local
->total_bytes
++;
5212 local
->byte_buffer_in_use
= false;
5215 /* If still not at proper byte, advance to there. */
5216 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5218 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5219 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5220 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5224 /* Set up the buffer if necessary. */
5225 if (!local
->byte_buffer_in_use
)
5229 local
->byte_buffer_in_use
= true;
5232 /* If this is nested constructor, recurse passing the bit offset and the
5233 pending data, then retrieve the new pending data afterwards. */
5234 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5236 oc_outer_state temp_state
;
5237 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5238 temp_state
.byte
= local
->byte
;
5240 += output_constructor (local
->val
, 0, 0, local
->reverse
, &temp_state
);
5241 local
->byte
= temp_state
.byte
;
5245 /* Otherwise, we must split the element into pieces that fall within
5246 separate bytes, and combine each byte with previous or following
5248 while (next_offset
< end_offset
)
5252 HOST_WIDE_INT value
;
5253 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5254 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5256 /* Advance from byte to byte within this element when necessary. */
5257 while (next_byte
!= local
->total_bytes
)
5259 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5260 local
->total_bytes
++;
5264 /* Number of bits we can process at once (all part of the same byte). */
5265 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5266 if (local
->reverse
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
5268 /* For big-endian data, take the most significant bits (of the
5269 bits that are significant) first and put them into bytes from
5270 the most significant end. */
5271 shift
= end_offset
- next_offset
- this_time
;
5273 /* Don't try to take a bunch of bits that cross
5274 the word boundary in the INTEGER_CST. We can
5275 only select bits from one element. */
5276 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5277 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5279 const int end
= shift
+ this_time
- 1;
5280 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5281 this_time
= end
- shift
+ 1;
5284 /* Now get the bits from the appropriate constant word. */
5285 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5286 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5288 /* Get the result. This works only when:
5289 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5290 local
->byte
|= (((value
>> shift
)
5291 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5292 << (BITS_PER_UNIT
- this_time
- next_bit
));
5296 /* On little-endian machines, take the least significant bits of
5297 the value first and pack them starting at the least significant
5298 bits of the bytes. */
5299 shift
= next_offset
- byte_relative_ebitpos
;
5301 /* Don't try to take a bunch of bits that cross
5302 the word boundary in the INTEGER_CST. We can
5303 only select bits from one element. */
5304 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5305 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5307 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5309 /* Now get the bits from the appropriate constant word. */
5310 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5311 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5313 /* Get the result. This works only when:
5314 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5315 local
->byte
|= (((value
>> shift
)
5316 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5320 next_offset
+= this_time
;
5321 local
->byte_buffer_in_use
= true;
5325 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5326 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5327 caller output state of relevance in recursive invocations. */
5329 static unsigned HOST_WIDE_INT
5330 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
5331 bool reverse
, oc_outer_state
*outer
)
5333 unsigned HOST_WIDE_INT cnt
;
5334 constructor_elt
*ce
;
5335 oc_local_state local
;
5337 /* Setup our local state to communicate with helpers. */
5339 local
.type
= TREE_TYPE (exp
);
5341 local
.align
= align
;
5342 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5343 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5345 local
.min_index
= integer_zero_node
;
5347 local
.total_bytes
= 0;
5348 local
.byte_buffer_in_use
= outer
!= NULL
;
5349 local
.byte
= outer
? outer
->byte
: 0;
5350 local
.last_relative_index
= -1;
5351 /* The storage order is specified for every aggregate type. */
5352 if (AGGREGATE_TYPE_P (local
.type
))
5353 local
.reverse
= TYPE_REVERSE_STORAGE_ORDER (local
.type
);
5355 local
.reverse
= reverse
;
5357 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5359 /* As CE goes through the elements of the constant, FIELD goes through the
5360 structure fields if the constant is a structure. If the constant is a
5361 union, we override this by getting the field from the TREE_LIST element.
5362 But the constant could also be an array. Then FIELD is zero.
5364 There is always a maximum of one element in the chain LINK for unions
5365 (even if the initializer in a source program incorrectly contains
5368 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5369 local
.field
= TYPE_FIELDS (local
.type
);
5371 local
.field
= NULL_TREE
;
5374 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5375 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5377 local
.val
= ce
->value
;
5378 local
.index
= NULL_TREE
;
5380 /* The element in a union constructor specifies the proper field
5382 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5383 local
.field
= ce
->index
;
5385 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5386 local
.index
= ce
->index
;
5388 if (local
.field
&& flag_verbose_asm
)
5389 fprintf (asm_out_file
, "%s %s:\n",
5391 DECL_NAME (local
.field
)
5392 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5395 /* Eliminate the marker that makes a cast not be an lvalue. */
5396 if (local
.val
!= NULL_TREE
)
5397 STRIP_NOPS (local
.val
);
5399 /* Output the current element, using the appropriate helper ... */
5401 /* For an array slice not part of an outer bitfield. */
5403 && local
.index
!= NULL_TREE
5404 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5405 output_constructor_array_range (&local
);
5407 /* For a field that is neither a true bitfield nor part of an outer one,
5408 known to be at least byte aligned and multiple-of-bytes long. */
5410 && (local
.field
== NULL_TREE
5411 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5412 output_constructor_regular_field (&local
);
5414 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5415 supported for scalar fields, so we may need to convert first. */
5418 if (TREE_CODE (local
.val
) == REAL_CST
)
5420 = fold_unary (VIEW_CONVERT_EXPR
,
5421 build_nonstandard_integer_type
5422 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5424 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5428 /* If we are not at toplevel, save the pending data for our caller.
5429 Otherwise output the pending data and padding zeros as needed. */
5431 outer
->byte
= local
.byte
;
5434 if (local
.byte_buffer_in_use
)
5436 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5437 local
.total_bytes
++;
5440 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5442 assemble_zeros (local
.size
- local
.total_bytes
);
5443 local
.total_bytes
= local
.size
;
5447 return local
.total_bytes
;
5450 /* Mark DECL as weak. */
5453 mark_weak (tree decl
)
5455 if (DECL_WEAK (decl
))
5458 struct symtab_node
*n
= symtab_node::get (decl
);
5459 if (n
&& n
->refuse_visibility_changes
)
5460 error ("%+qD declared weak after being used", decl
);
5461 DECL_WEAK (decl
) = 1;
5463 if (DECL_RTL_SET_P (decl
)
5464 && MEM_P (DECL_RTL (decl
))
5465 && XEXP (DECL_RTL (decl
), 0)
5466 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5467 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5470 /* Merge weak status between NEWDECL and OLDDECL. */
5473 merge_weak (tree newdecl
, tree olddecl
)
5475 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5477 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5480 /* We put the NEWDECL on the weak_decls list at some point
5481 and OLDDECL as well. Keep just OLDDECL on the list. */
5482 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5483 if (TREE_VALUE (*pwd
) == newdecl
)
5485 *pwd
= TREE_CHAIN (*pwd
);
5492 if (DECL_WEAK (newdecl
))
5496 /* NEWDECL is weak, but OLDDECL is not. */
5498 /* If we already output the OLDDECL, we're in trouble; we can't
5499 go back and make it weak. This should never happen in
5500 unit-at-a-time compilation. */
5501 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5503 /* If we've already generated rtl referencing OLDDECL, we may
5504 have done so in a way that will not function properly with
5505 a weak symbol. Again in unit-at-a-time this should be
5507 gcc_assert (!TREE_USED (olddecl
)
5508 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5510 /* PR 49899: You cannot convert a static function into a weak, public function. */
5511 if (! TREE_PUBLIC (olddecl
) && TREE_PUBLIC (newdecl
))
5512 error ("weak declaration of %q+D being applied to a already "
5513 "existing, static definition", newdecl
);
5515 if (TARGET_SUPPORTS_WEAK
)
5517 /* We put the NEWDECL on the weak_decls list at some point.
5518 Replace it with the OLDDECL. */
5519 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5520 if (TREE_VALUE (wd
) == newdecl
)
5522 TREE_VALUE (wd
) = olddecl
;
5525 /* We may not find the entry on the list. If NEWDECL is a
5526 weak alias, then we will have already called
5527 globalize_decl to remove the entry; in that case, we do
5528 not need to do anything. */
5531 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5532 mark_weak (olddecl
);
5535 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5536 weak. Just update NEWDECL to indicate that it's weak too. */
5537 mark_weak (newdecl
);
5540 /* Declare DECL to be a weak symbol. */
5543 declare_weak (tree decl
)
5545 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5546 if (! TREE_PUBLIC (decl
))
5548 error ("weak declaration of %q+D must be public", decl
);
5551 else if (!TARGET_SUPPORTS_WEAK
)
5552 warning (0, "weak declaration of %q+D not supported", decl
);
5555 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5556 DECL_ATTRIBUTES (decl
)
5557 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5561 weak_finish_1 (tree decl
)
5563 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5564 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5567 if (! TREE_USED (decl
))
5570 #ifdef ASM_WEAKEN_DECL
5571 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5573 #ifdef ASM_WEAKEN_LABEL
5574 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5576 #ifdef ASM_OUTPUT_WEAK_ALIAS
5578 static bool warn_once
= 0;
5581 warning (0, "only weak aliases are supported in this configuration");
5591 /* Fiven an assembly name, find the decl it is associated with. */
5593 find_decl (tree target
)
5595 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5601 /* This TREE_LIST contains weakref targets. */
5603 static GTY(()) tree weakref_targets
;
5605 /* Emit any pending weak declarations. */
5612 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5614 tree alias_decl
= TREE_PURPOSE (t
);
5615 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5617 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5618 /* Remove alias_decl from the weak list, but leave entries for
5619 the target alone. */
5621 #ifndef ASM_OUTPUT_WEAKREF
5622 else if (! TREE_SYMBOL_REFERENCED (target
))
5624 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5625 defined, otherwise we and weak_finish_1 would use
5626 different macros. */
5627 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5628 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5630 tree decl
= find_decl (target
);
5634 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5635 TREE_CODE (alias_decl
), target
,
5636 TREE_TYPE (alias_decl
));
5638 DECL_EXTERNAL (decl
) = 1;
5639 TREE_PUBLIC (decl
) = 1;
5640 DECL_ARTIFICIAL (decl
) = 1;
5641 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5642 TREE_USED (decl
) = 1;
5645 weak_finish_1 (decl
);
5654 /* Remove the alias and the target from the pending weak list
5655 so that we do not emit any .weak directives for the former,
5656 nor multiple .weak directives for the latter. */
5657 for (p
= &weak_decls
; (t2
= *p
) ; )
5659 if (TREE_VALUE (t2
) == alias_decl
5660 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5661 *p
= TREE_CHAIN (t2
);
5663 p
= &TREE_CHAIN (t2
);
5666 /* Remove other weakrefs to the same target, to speed things up. */
5667 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5669 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5670 *p
= TREE_CHAIN (t2
);
5672 p
= &TREE_CHAIN (t2
);
5677 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5679 tree decl
= TREE_VALUE (t
);
5681 weak_finish_1 (decl
);
5685 /* Emit the assembly bits to indicate that DECL is globally visible. */
5688 globalize_decl (tree decl
)
5691 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5692 if (DECL_WEAK (decl
))
5694 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5697 #ifdef ASM_WEAKEN_DECL
5698 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5700 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5703 /* Remove this function from the pending weak list so that
5704 we do not emit multiple .weak directives for it. */
5705 for (p
= &weak_decls
; (t
= *p
) ; )
5707 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5708 *p
= TREE_CHAIN (t
);
5710 p
= &TREE_CHAIN (t
);
5713 /* Remove weakrefs to the same target from the pending weakref
5714 list, for the same reason. */
5715 for (p
= &weakref_targets
; (t
= *p
) ; )
5717 if (DECL_ASSEMBLER_NAME (decl
)
5718 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5719 *p
= TREE_CHAIN (t
);
5721 p
= &TREE_CHAIN (t
);
5728 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5731 vec
<alias_pair
, va_gc
> *alias_pairs
;
5733 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5734 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5735 tree node is DECL to have the value of the tree node TARGET. */
5738 do_assemble_alias (tree decl
, tree target
)
5742 /* Emulated TLS had better not get this var. */
5743 gcc_assert (!(!targetm
.have_tls
5745 && DECL_THREAD_LOCAL_P (decl
)));
5747 if (TREE_ASM_WRITTEN (decl
))
5750 id
= DECL_ASSEMBLER_NAME (decl
);
5751 ultimate_transparent_alias_target (&id
);
5752 ultimate_transparent_alias_target (&target
);
5754 /* We must force creation of DECL_RTL for debug info generation, even though
5755 we don't use it here. */
5756 make_decl_rtl (decl
);
5758 TREE_ASM_WRITTEN (decl
) = 1;
5759 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5760 TREE_ASM_WRITTEN (id
) = 1;
5762 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5764 if (!TREE_SYMBOL_REFERENCED (target
))
5765 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5767 #ifdef ASM_OUTPUT_WEAKREF
5768 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5769 IDENTIFIER_POINTER (id
),
5770 IDENTIFIER_POINTER (target
));
5772 if (!TARGET_SUPPORTS_WEAK
)
5774 error_at (DECL_SOURCE_LOCATION (decl
),
5775 "weakref is not supported in this configuration");
5782 #ifdef ASM_OUTPUT_DEF
5783 tree orig_decl
= decl
;
5785 if (TREE_CODE (decl
) == FUNCTION_DECL
5786 && cgraph_node::get (decl
)->instrumentation_clone
5787 && cgraph_node::get (decl
)->instrumented_version
)
5788 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5790 /* Make name accessible from other files, if appropriate. */
5792 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5794 globalize_decl (decl
);
5795 maybe_assemble_visibility (decl
);
5797 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5799 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5800 if (targetm
.has_ifunc_p ())
5801 ASM_OUTPUT_TYPE_DIRECTIVE
5802 (asm_out_file
, IDENTIFIER_POINTER (id
),
5806 error_at (DECL_SOURCE_LOCATION (decl
),
5807 "ifunc is not supported on this target");
5810 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5811 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5813 ASM_OUTPUT_DEF (asm_out_file
,
5814 IDENTIFIER_POINTER (id
),
5815 IDENTIFIER_POINTER (target
));
5817 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5822 name
= IDENTIFIER_POINTER (id
);
5823 # ifdef ASM_WEAKEN_DECL
5824 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5826 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5828 /* Remove this function from the pending weak list so that
5829 we do not emit multiple .weak directives for it. */
5830 for (p
= &weak_decls
; (t
= *p
) ; )
5831 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5832 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5833 *p
= TREE_CHAIN (t
);
5835 p
= &TREE_CHAIN (t
);
5837 /* Remove weakrefs to the same target from the pending weakref
5838 list, for the same reason. */
5839 for (p
= &weakref_targets
; (t
= *p
) ; )
5841 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5842 *p
= TREE_CHAIN (t
);
5844 p
= &TREE_CHAIN (t
);
5850 /* Emit an assembler directive to make the symbol for DECL an alias to
5851 the symbol for TARGET. */
5854 assemble_alias (tree decl
, tree target
)
5858 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5860 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5862 ultimate_transparent_alias_target (&target
);
5864 if (alias
== target
)
5865 error ("weakref %q+D ultimately targets itself", decl
);
5866 if (TREE_PUBLIC (decl
))
5867 error ("weakref %q+D must have static linkage", decl
);
5871 #if !defined (ASM_OUTPUT_DEF)
5872 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5873 error_at (DECL_SOURCE_LOCATION (decl
),
5874 "alias definitions not supported in this configuration");
5875 TREE_ASM_WRITTEN (decl
) = 1;
5878 if (!DECL_WEAK (decl
))
5880 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5881 error_at (DECL_SOURCE_LOCATION (decl
),
5882 "ifunc is not supported in this configuration");
5884 error_at (DECL_SOURCE_LOCATION (decl
),
5885 "only weak aliases are supported in this configuration");
5886 TREE_ASM_WRITTEN (decl
) = 1;
5892 TREE_USED (decl
) = 1;
5894 /* Allow aliases to aliases. */
5895 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5896 cgraph_node::get_create (decl
)->alias
= true;
5898 varpool_node::get_create (decl
)->alias
= true;
5900 /* If the target has already been emitted, we don't have to queue the
5901 alias. This saves a tad of memory. */
5902 if (symtab
->global_info_ready
)
5903 target_decl
= find_decl (target
);
5906 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5907 || symtab
->state
>= EXPANSION
)
5908 do_assemble_alias (decl
, target
);
5911 alias_pair p
= {decl
, target
};
5912 vec_safe_push (alias_pairs
, p
);
5916 /* Record and output a table of translations from original function
5917 to its transaction aware clone. Note that tm_pure functions are
5918 considered to be their own clone. */
5920 struct tm_clone_hasher
: ggc_cache_ptr_hash
<tree_map
>
5922 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5923 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5926 keep_cache_entry (tree_map
*&e
)
5928 return ggc_marked_p (e
->base
.from
);
5932 static GTY((cache
)) hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5935 record_tm_clone_pair (tree o
, tree n
)
5937 struct tree_map
**slot
, *h
;
5939 if (tm_clone_hash
== NULL
)
5940 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5942 h
= ggc_alloc
<tree_map
> ();
5943 h
->hash
= htab_hash_pointer (o
);
5947 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5952 get_tm_clone_pair (tree o
)
5956 struct tree_map
*h
, in
;
5959 in
.hash
= htab_hash_pointer (o
);
5960 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5967 struct tm_alias_pair
5975 /* Dump the actual pairs to the .tm_clone_table section. */
5978 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5982 bool switched
= false;
5984 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5988 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5989 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5991 /* The function ipa_tm_create_version() marks the clone as needed if
5992 the original function was needed. But we also mark the clone as
5993 needed if we ever called the clone indirectly through
5994 TM_GETTMCLONE. If neither of these are true, we didn't generate
5995 a clone, and we didn't call it indirectly... no sense keeping it
5996 in the clone table. */
5997 if (!dst_n
|| !dst_n
->definition
)
6000 /* This covers the case where we have optimized the original
6001 function away, and only access the transactional clone. */
6002 if (!src_n
|| !src_n
->definition
)
6007 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
6008 assemble_align (POINTER_SIZE
);
6012 assemble_integer (XEXP (DECL_RTL (src
), 0),
6013 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6014 assemble_integer (XEXP (DECL_RTL (dst
), 0),
6015 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6019 /* Provide a default for the tm_clone_table section. */
6022 default_clone_table_section (void)
6024 return get_named_section (NULL
, ".tm_clone_table", 3);
6027 /* Helper comparison function for qsorting by the DECL_UID stored in
6028 alias_pair->emitted_diags. */
6031 tm_alias_pair_cmp (const void *x
, const void *y
)
6033 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
6034 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
6035 if (p1
->uid
< p2
->uid
)
6037 if (p1
->uid
> p2
->uid
)
6043 finish_tm_clone_pairs (void)
6045 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
6047 if (tm_clone_hash
== NULL
)
6050 /* We need a determenistic order for the .tm_clone_table, otherwise
6051 we will get bootstrap comparison failures, so dump the hash table
6052 to a vector, sort it, and dump the vector. */
6054 /* Dump the hashtable to a vector. */
6056 hash_table
<tm_clone_hasher
>::iterator iter
;
6057 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
6059 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
6060 tm_alias_pairs
.safe_push (p
);
6063 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
6066 dump_tm_clone_pairs (tm_alias_pairs
);
6068 tm_clone_hash
->empty ();
6069 tm_clone_hash
= NULL
;
6070 tm_alias_pairs
.release ();
6074 /* Emit an assembler directive to set symbol for DECL visibility to
6075 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
6078 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
6079 int vis ATTRIBUTE_UNUSED
)
6081 #ifdef HAVE_GAS_HIDDEN
6082 static const char * const visibility_types
[] = {
6083 NULL
, "protected", "hidden", "internal"
6086 const char *name
, *type
;
6089 id
= DECL_ASSEMBLER_NAME (decl
);
6090 ultimate_transparent_alias_target (&id
);
6091 name
= IDENTIFIER_POINTER (id
);
6093 type
= visibility_types
[vis
];
6095 fprintf (asm_out_file
, "\t.%s\t", type
);
6096 assemble_name (asm_out_file
, name
);
6097 fprintf (asm_out_file
, "\n");
6099 if (!DECL_ARTIFICIAL (decl
))
6100 warning (OPT_Wattributes
, "visibility attribute not supported "
6101 "in this configuration; ignored");
6105 /* A helper function to call assemble_visibility when needed for a decl. */
6108 maybe_assemble_visibility (tree decl
)
6110 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
6112 if (TREE_CODE (decl
) == FUNCTION_DECL
6113 && cgraph_node::get (decl
)
6114 && cgraph_node::get (decl
)->instrumentation_clone
6115 && cgraph_node::get (decl
)->instrumented_version
)
6116 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
6118 if (vis
!= VISIBILITY_DEFAULT
)
6120 targetm
.asm_out
.assemble_visibility (decl
, vis
);
6127 /* Returns 1 if the target configuration supports defining public symbols
6128 so that one of them will be chosen at link time instead of generating a
6129 multiply-defined symbol error, whether through the use of weak symbols or
6130 a target-specific mechanism for having duplicates discarded. */
6133 supports_one_only (void)
6135 if (SUPPORTS_ONE_ONLY
)
6137 return TARGET_SUPPORTS_WEAK
;
6140 /* Set up DECL as a public symbol that can be defined in multiple
6141 translation units without generating a linker error. */
6144 make_decl_one_only (tree decl
, tree comdat_group
)
6146 struct symtab_node
*symbol
;
6147 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
6149 TREE_PUBLIC (decl
) = 1;
6152 symbol
= varpool_node::get_create (decl
);
6154 symbol
= cgraph_node::get_create (decl
);
6156 if (SUPPORTS_ONE_ONLY
)
6158 #ifdef MAKE_DECL_ONE_ONLY
6159 MAKE_DECL_ONE_ONLY (decl
);
6161 symbol
->set_comdat_group (comdat_group
);
6163 else if (VAR_P (decl
)
6164 && (DECL_INITIAL (decl
) == 0
6165 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6166 DECL_COMMON (decl
) = 1;
6169 gcc_assert (TARGET_SUPPORTS_WEAK
);
6170 DECL_WEAK (decl
) = 1;
6175 init_varasm_once (void)
6177 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6178 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6179 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6181 shared_constant_pool
= create_constant_pool ();
6183 #ifdef TEXT_SECTION_ASM_OP
6184 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6185 TEXT_SECTION_ASM_OP
);
6188 #ifdef DATA_SECTION_ASM_OP
6189 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6190 DATA_SECTION_ASM_OP
);
6193 #ifdef SDATA_SECTION_ASM_OP
6194 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6195 SDATA_SECTION_ASM_OP
);
6198 #ifdef READONLY_DATA_SECTION_ASM_OP
6199 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6200 READONLY_DATA_SECTION_ASM_OP
);
6203 #ifdef CTORS_SECTION_ASM_OP
6204 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6205 CTORS_SECTION_ASM_OP
);
6208 #ifdef DTORS_SECTION_ASM_OP
6209 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6210 DTORS_SECTION_ASM_OP
);
6213 #ifdef BSS_SECTION_ASM_OP
6214 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6215 output_section_asm_op
,
6216 BSS_SECTION_ASM_OP
);
6219 #ifdef SBSS_SECTION_ASM_OP
6220 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6221 output_section_asm_op
,
6222 SBSS_SECTION_ASM_OP
);
6225 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6226 | SECTION_COMMON
, emit_tls_common
);
6227 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6228 | SECTION_COMMON
, emit_local
);
6229 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6230 | SECTION_COMMON
, emit_common
);
6232 #if defined ASM_OUTPUT_ALIGNED_BSS
6233 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6237 targetm
.asm_out
.init_sections ();
6239 if (readonly_data_section
== NULL
)
6240 readonly_data_section
= text_section
;
6242 #ifdef ASM_OUTPUT_EXTERNAL
6243 pending_assemble_externals_set
= new hash_set
<tree
>;
6248 decl_default_tls_model (const_tree decl
)
6250 enum tls_model kind
;
6253 is_local
= targetm
.binds_local_p (decl
);
6257 kind
= TLS_MODEL_LOCAL_EXEC
;
6259 kind
= TLS_MODEL_INITIAL_EXEC
;
6262 /* Local dynamic is inefficient when we're not combining the
6263 parts of the address. */
6264 else if (optimize
&& is_local
)
6265 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6267 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6268 if (kind
< flag_tls_default
)
6269 kind
= flag_tls_default
;
6274 /* Select a set of attributes for section NAME based on the properties
6275 of DECL and whether or not RELOC indicates that DECL's initializer
6276 might contain runtime relocations.
6278 We make the section read-only and executable for a function decl,
6279 read-only for a const data decl, and writable for a non-const data decl. */
6282 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6286 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6287 flags
= SECTION_CODE
;
6290 enum section_category category
6291 = categorize_decl_for_section (decl
, reloc
);
6292 if (decl_readonly_section_1 (category
))
6294 else if (category
== SECCAT_DATA_REL_RO
6295 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6296 flags
= SECTION_WRITE
| SECTION_RELRO
;
6298 flags
= SECTION_WRITE
;
6302 flags
= SECTION_WRITE
;
6303 if (strcmp (name
, ".data.rel.ro") == 0
6304 || strcmp (name
, ".data.rel.ro.local") == 0)
6305 flags
|= SECTION_RELRO
;
6308 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6309 flags
|= SECTION_LINKONCE
;
6311 if (strcmp (name
, ".vtable_map_vars") == 0)
6312 flags
|= SECTION_LINKONCE
;
6314 if (decl
&& VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6315 flags
|= SECTION_TLS
| SECTION_WRITE
;
6317 if (strcmp (name
, ".bss") == 0
6318 || strncmp (name
, ".bss.", 5) == 0
6319 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6320 || strcmp (name
, ".persistent.bss") == 0
6321 || strcmp (name
, ".sbss") == 0
6322 || strncmp (name
, ".sbss.", 6) == 0
6323 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6324 flags
|= SECTION_BSS
;
6326 if (strcmp (name
, ".tdata") == 0
6327 || strncmp (name
, ".tdata.", 7) == 0
6328 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6329 flags
|= SECTION_TLS
;
6331 if (strcmp (name
, ".tbss") == 0
6332 || strncmp (name
, ".tbss.", 6) == 0
6333 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6334 flags
|= SECTION_TLS
| SECTION_BSS
;
6336 /* These three sections have special ELF types. They are neither
6337 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6338 want to print a section type (@progbits or @nobits). If someone
6339 is silly enough to emit code or TLS variables to one of these
6340 sections, then don't handle them specially. */
6341 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6342 && (strcmp (name
, ".init_array") == 0
6343 || strcmp (name
, ".fini_array") == 0
6344 || strcmp (name
, ".preinit_array") == 0))
6345 flags
|= SECTION_NOTYPE
;
6350 /* Return true if the target supports some form of global BSS,
6351 either through bss_noswitch_section, or by selecting a BSS
6352 section in TARGET_ASM_SELECT_SECTION. */
6355 have_global_bss_p (void)
6357 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6360 /* Output assembly to switch to section NAME with attribute FLAGS.
6361 Four variants for common object file formats. */
6364 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6365 unsigned int flags ATTRIBUTE_UNUSED
,
6366 tree decl ATTRIBUTE_UNUSED
)
6368 /* Some object formats don't support named sections at all. The
6369 front-end should already have flagged this as an error. */
6373 #ifndef TLS_SECTION_ASM_FLAG
6374 #define TLS_SECTION_ASM_FLAG 'T'
6378 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6381 char flagchars
[11], *f
= flagchars
;
6382 unsigned int numeric_value
= 0;
6384 /* If we have already declared this section, we can use an
6385 abbreviated form to switch back to it -- unless this section is
6386 part of a COMDAT groups, in which case GAS requires the full
6387 declaration every time. */
6388 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6389 && (flags
& SECTION_DECLARED
))
6391 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6395 /* If we have a machine specific flag, then use the numeric value to pass
6397 if (targetm
.asm_out
.elf_flags_numeric (flags
, &numeric_value
))
6398 snprintf (f
, sizeof (flagchars
), "0x%08x", numeric_value
);
6401 if (!(flags
& SECTION_DEBUG
))
6403 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6404 if (flags
& SECTION_EXCLUDE
)
6407 if (flags
& SECTION_WRITE
)
6409 if (flags
& SECTION_CODE
)
6411 if (flags
& SECTION_SMALL
)
6413 if (flags
& SECTION_MERGE
)
6415 if (flags
& SECTION_STRINGS
)
6417 if (flags
& SECTION_TLS
)
6418 *f
++ = TLS_SECTION_ASM_FLAG
;
6419 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6421 #ifdef MACH_DEP_SECTION_ASM_FLAG
6422 if (flags
& SECTION_MACH_DEP
)
6423 *f
++ = MACH_DEP_SECTION_ASM_FLAG
;
6428 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6430 if (!(flags
& SECTION_NOTYPE
))
6435 if (flags
& SECTION_BSS
)
6441 /* On platforms that use "@" as the assembly comment character,
6443 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6445 fprintf (asm_out_file
, format
, type
);
6447 if (flags
& SECTION_ENTSIZE
)
6448 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6449 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6451 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6452 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6454 fprintf (asm_out_file
, ",%s,comdat",
6455 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6459 putc ('\n', asm_out_file
);
6463 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6464 tree decl ATTRIBUTE_UNUSED
)
6466 char flagchars
[8], *f
= flagchars
;
6468 if (flags
& SECTION_WRITE
)
6470 if (flags
& SECTION_CODE
)
6474 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6478 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6481 default_coff_asm_named_section (name
, flags
, decl
);
6483 if (flags
& SECTION_LINKONCE
)
6485 /* Functions may have been compiled at various levels of
6486 optimization so we can't use `same_size' here.
6487 Instead, have the linker pick one. */
6488 fprintf (asm_out_file
, "\t.linkonce %s\n",
6489 (flags
& SECTION_CODE
? "discard" : "same_size"));
6493 /* The lame default section selector. */
6496 default_select_section (tree decl
, int reloc
,
6497 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6501 if (decl_readonly_section (decl
, reloc
))
6502 return readonly_data_section
;
6504 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6506 if (! ((flag_pic
&& reloc
)
6507 || !TREE_READONLY (decl
)
6508 || TREE_SIDE_EFFECTS (decl
)
6509 || !TREE_CONSTANT (decl
)))
6510 return readonly_data_section
;
6512 else if (TREE_CODE (decl
) == STRING_CST
)
6513 return readonly_data_section
;
6514 else if (! (flag_pic
&& reloc
))
6515 return readonly_data_section
;
6517 return data_section
;
6520 enum section_category
6521 categorize_decl_for_section (const_tree decl
, int reloc
)
6523 enum section_category ret
;
6525 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6527 else if (TREE_CODE (decl
) == STRING_CST
)
6529 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6530 && asan_protect_global (CONST_CAST_TREE (decl
)))
6531 /* or !flag_merge_constants */
6532 return SECCAT_RODATA
;
6534 return SECCAT_RODATA_MERGE_STR
;
6536 else if (VAR_P (decl
))
6538 tree d
= CONST_CAST_TREE (decl
);
6539 if (bss_initializer_p (decl
))
6541 else if (! TREE_READONLY (decl
)
6542 || TREE_SIDE_EFFECTS (decl
)
6543 || (DECL_INITIAL (decl
)
6544 && ! TREE_CONSTANT (DECL_INITIAL (decl
))))
6546 /* Here the reloc_rw_mask is not testing whether the section should
6547 be read-only or not, but whether the dynamic link will have to
6548 do something. If so, we wish to segregate the data in order to
6549 minimize cache misses inside the dynamic linker. */
6550 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6551 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6555 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6556 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6557 else if (reloc
|| flag_merge_constants
< 2
6558 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6559 /* PR 81697: for architectures that use section anchors we
6560 need to ignore DECL_RTL_SET_P (decl) for string constants
6561 inside this asan_protect_global call because otherwise
6562 we'll wrongly put them into SECCAT_RODATA_MERGE_CONST
6563 section, set DECL_RTL (decl) later on and add DECL to
6564 protected globals via successive asan_protect_global
6565 calls. In this scenario we'll end up with wrong
6566 alignment of these strings at runtime and possible ASan
6568 && asan_protect_global (d
, use_object_blocks_p ()
6569 && use_blocks_for_decl_p (d
))))
6570 /* C and C++ don't allow different variables to share the same
6571 location. -fmerge-all-constants allows even that (at the
6572 expense of not conforming). */
6573 ret
= SECCAT_RODATA
;
6574 else if (DECL_INITIAL (decl
)
6575 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6576 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6578 ret
= SECCAT_RODATA_MERGE_CONST
;
6580 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6582 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6583 || TREE_SIDE_EFFECTS (decl
)
6584 || ! TREE_CONSTANT (decl
))
6587 ret
= SECCAT_RODATA
;
6590 ret
= SECCAT_RODATA
;
6592 /* There are no read-only thread-local sections. */
6593 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6595 /* Note that this would be *just* SECCAT_BSS, except that there's
6596 no concept of a read-only thread-local-data section. */
6597 if (ret
== SECCAT_BSS
6598 || DECL_INITIAL (decl
) == NULL
6599 || (flag_zero_initialized_in_bss
6600 && initializer_zerop (DECL_INITIAL (decl
))))
6606 /* If the target uses small data sections, select it. */
6607 else if (targetm
.in_small_data_p (decl
))
6609 if (ret
== SECCAT_BSS
)
6611 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6612 ret
= SECCAT_SRODATA
;
6621 decl_readonly_section_1 (enum section_category category
)
6626 case SECCAT_RODATA_MERGE_STR
:
6627 case SECCAT_RODATA_MERGE_STR_INIT
:
6628 case SECCAT_RODATA_MERGE_CONST
:
6629 case SECCAT_SRODATA
:
6637 decl_readonly_section (const_tree decl
, int reloc
)
6639 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6642 /* Select a section based on the above categorization. */
6645 default_elf_select_section (tree decl
, int reloc
,
6646 unsigned HOST_WIDE_INT align
)
6649 switch (categorize_decl_for_section (decl
, reloc
))
6652 /* We're not supposed to be called on FUNCTION_DECLs. */
6655 return readonly_data_section
;
6656 case SECCAT_RODATA_MERGE_STR
:
6657 return mergeable_string_section (decl
, align
, 0);
6658 case SECCAT_RODATA_MERGE_STR_INIT
:
6659 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6660 case SECCAT_RODATA_MERGE_CONST
:
6661 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6662 case SECCAT_SRODATA
:
6666 return data_section
;
6667 case SECCAT_DATA_REL
:
6668 sname
= ".data.rel";
6670 case SECCAT_DATA_REL_LOCAL
:
6671 sname
= ".data.rel.local";
6673 case SECCAT_DATA_REL_RO
:
6674 sname
= ".data.rel.ro";
6676 case SECCAT_DATA_REL_RO_LOCAL
:
6677 sname
= ".data.rel.ro.local";
6700 return get_named_section (decl
, sname
, reloc
);
6703 /* Construct a unique section name based on the decl name and the
6704 categorization performed above. */
6707 default_unique_section (tree decl
, int reloc
)
6709 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6710 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6711 const char *prefix
, *name
, *linkonce
;
6715 switch (categorize_decl_for_section (decl
, reloc
))
6718 prefix
= one_only
? ".t" : ".text";
6721 case SECCAT_RODATA_MERGE_STR
:
6722 case SECCAT_RODATA_MERGE_STR_INIT
:
6723 case SECCAT_RODATA_MERGE_CONST
:
6724 prefix
= one_only
? ".r" : ".rodata";
6726 case SECCAT_SRODATA
:
6727 prefix
= one_only
? ".s2" : ".sdata2";
6730 prefix
= one_only
? ".d" : ".data";
6732 case SECCAT_DATA_REL
:
6733 prefix
= one_only
? ".d.rel" : ".data.rel";
6735 case SECCAT_DATA_REL_LOCAL
:
6736 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6738 case SECCAT_DATA_REL_RO
:
6739 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6741 case SECCAT_DATA_REL_RO_LOCAL
:
6742 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6745 prefix
= one_only
? ".s" : ".sdata";
6748 prefix
= one_only
? ".b" : ".bss";
6751 prefix
= one_only
? ".sb" : ".sbss";
6754 prefix
= one_only
? ".td" : ".tdata";
6757 prefix
= one_only
? ".tb" : ".tbss";
6763 id
= DECL_ASSEMBLER_NAME (decl
);
6764 ultimate_transparent_alias_target (&id
);
6765 name
= IDENTIFIER_POINTER (id
);
6766 name
= targetm
.strip_name_encoding (name
);
6768 /* If we're using one_only, then there needs to be a .gnu.linkonce
6769 prefix to the section name. */
6770 linkonce
= one_only
? ".gnu.linkonce" : "";
6772 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6774 set_decl_section_name (decl
, string
);
6777 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6780 compute_reloc_for_rtx_1 (const_rtx x
)
6782 switch (GET_CODE (x
))
6785 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6793 /* Like compute_reloc_for_constant, except for an RTX. The return value
6794 is a mask for which bit 1 indicates a global relocation, and bit 0
6795 indicates a local relocation. */
6798 compute_reloc_for_rtx (const_rtx x
)
6800 switch (GET_CODE (x
))
6804 return compute_reloc_for_rtx_1 (x
);
6809 subrtx_iterator::array_type array
;
6810 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6811 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6821 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6823 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6825 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6826 return data_section
;
6828 return readonly_data_section
;
6832 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6833 unsigned HOST_WIDE_INT align
)
6835 int reloc
= compute_reloc_for_rtx (x
);
6837 /* ??? Handle small data here somehow. */
6839 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6842 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6844 return get_named_section (NULL
, ".data.rel.ro", 3);
6847 return mergeable_constant_section (mode
, align
, 0);
6850 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6853 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6858 /* Careful not to prod global register variables. */
6861 symbol
= XEXP (rtl
, 0);
6862 if (GET_CODE (symbol
) != SYMBOL_REF
)
6865 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6866 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6867 flags
|= SYMBOL_FLAG_FUNCTION
;
6868 if (targetm
.binds_local_p (decl
))
6869 flags
|= SYMBOL_FLAG_LOCAL
;
6870 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6871 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6872 else if (targetm
.in_small_data_p (decl
))
6873 flags
|= SYMBOL_FLAG_SMALL
;
6874 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6875 being PUBLIC, the thing *must* be defined in this translation unit.
6876 Prevent this buglet from being propagated into rtl code as well. */
6877 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6878 flags
|= SYMBOL_FLAG_EXTERNAL
;
6880 SYMBOL_REF_FLAGS (symbol
) = flags
;
6883 /* By default, we do nothing for encode_section_info, so we need not
6884 do anything but discard the '*' marker. */
6887 default_strip_name_encoding (const char *str
)
6889 return str
+ (*str
== '*');
6892 #ifdef ASM_OUTPUT_DEF
6893 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6894 anchor relative to ".", the current section position. */
6897 default_asm_output_anchor (rtx symbol
)
6901 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6902 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6903 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6907 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6910 default_use_anchors_for_symbol_p (const_rtx symbol
)
6915 /* Don't use anchors for mergeable sections. The linker might move
6916 the objects around. */
6917 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6918 if (sect
->common
.flags
& SECTION_MERGE
)
6921 /* Don't use anchors for small data sections. The small data register
6922 acts as an anchor for such sections. */
6923 if (sect
->common
.flags
& SECTION_SMALL
)
6926 decl
= SYMBOL_REF_DECL (symbol
);
6927 if (decl
&& DECL_P (decl
))
6929 /* Don't use section anchors for decls that might be defined or
6930 usurped by other modules. */
6931 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6934 /* Don't use section anchors for decls that will be placed in a
6935 small data section. */
6936 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6937 one above. The problem is that we only use SECTION_SMALL for
6938 sections that should be marked as small in the section directive. */
6939 if (targetm
.in_small_data_p (decl
))
6942 /* Don't use section anchors for decls that won't fit inside a single
6943 anchor range to reduce the amount of instructions required to refer
6944 to the entire declaration. */
6945 if (DECL_SIZE_UNIT (decl
) == NULL_TREE
6946 || !tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
))
6947 || (tree_to_uhwi (DECL_SIZE_UNIT (decl
))
6948 >= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
))
6955 /* Return true when RESOLUTION indicate that symbol will be bound to the
6956 definition provided by current .o file. */
6959 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6961 return (resolution
== LDPR_PREVAILING_DEF
6962 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6963 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6966 /* Return true when RESOLUTION indicate that symbol will be bound locally
6967 within current executable or DSO. */
6970 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6972 return (resolution
== LDPR_PREVAILING_DEF
6973 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6974 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6975 || resolution
== LDPR_PREEMPTED_REG
6976 || resolution
== LDPR_PREEMPTED_IR
6977 || resolution
== LDPR_RESOLVED_IR
6978 || resolution
== LDPR_RESOLVED_EXEC
);
6981 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6982 uninitialized common symbol in the executable will still be defined
6983 (through COPY relocation) in the executable. */
6986 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
6987 bool extern_protected_data
, bool common_local_p
)
6989 /* A non-decl is an entry in the constant pool. */
6993 /* Weakrefs may not bind locally, even though the weakref itself is always
6994 static and therefore local. Similarly, the resolver for ifunc functions
6995 might resolve to a non-local function.
6996 FIXME: We can resolve the weakref case more curefuly by looking at the
6998 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6999 || (TREE_CODE (exp
) == FUNCTION_DECL
7000 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
7003 /* Static variables are always local. */
7004 if (! TREE_PUBLIC (exp
))
7007 /* With resolution file in hand, take look into resolutions.
7008 We can't just return true for resolved_locally symbols,
7009 because dynamic linking might overwrite symbols
7010 in shared libraries. */
7011 bool resolved_locally
= false;
7013 bool uninited_common
= (DECL_COMMON (exp
)
7014 && (DECL_INITIAL (exp
) == NULL
7016 && DECL_INITIAL (exp
) == error_mark_node
)));
7018 /* A non-external variable is defined locally only if it isn't
7019 uninitialized COMMON variable or common_local_p is true. */
7020 bool defined_locally
= (!DECL_EXTERNAL (exp
)
7021 && (!uninited_common
|| common_local_p
));
7022 if (symtab_node
*node
= symtab_node::get (exp
))
7024 if (node
->in_other_partition
)
7025 defined_locally
= true;
7026 if (node
->can_be_discarded_p ())
7028 else if (resolution_to_local_definition_p (node
->resolution
))
7029 defined_locally
= resolved_locally
= true;
7030 else if (resolution_local_p (node
->resolution
))
7031 resolved_locally
= true;
7033 if (defined_locally
&& weak_dominate
&& !shlib
)
7034 resolved_locally
= true;
7036 /* Undefined weak symbols are never defined locally. */
7037 if (DECL_WEAK (exp
) && !defined_locally
)
7040 /* A symbol is local if the user has said explicitly that it will be,
7041 or if we have a definition for the symbol. We cannot infer visibility
7042 for undefined symbols. */
7043 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
7044 && (TREE_CODE (exp
) == FUNCTION_DECL
7045 || !extern_protected_data
7046 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
7047 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
7050 /* If PIC, then assume that any global name can be overridden by
7051 symbols resolved from other modules. */
7055 /* Variables defined outside this object might not be local. */
7056 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
7059 /* Non-dominant weak symbols are not defined locally. */
7060 if (DECL_WEAK (exp
) && !resolved_locally
)
7063 /* Uninitialized COMMON variable may be unified with symbols
7064 resolved from other modules. */
7065 if (uninited_common
&& !resolved_locally
)
7068 /* Otherwise we're left with initialized (or non-common) global data
7069 which is of necessity defined locally. */
7073 /* Assume ELF-ish defaults, since that's pretty much the most liberal
7074 wrt cross-module name binding. */
7077 default_binds_local_p (const_tree exp
)
7079 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
7082 /* Similar to default_binds_local_p, but common symbol may be local and
7083 extern protected data is non-local. */
7086 default_binds_local_p_2 (const_tree exp
)
7088 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, true,
7093 default_binds_local_p_1 (const_tree exp
, int shlib
)
7095 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
7098 /* Return true when references to DECL must bind to current definition in
7101 The condition is usually equivalent to whether the function binds to the
7102 current module (shared library or executable), that is to binds_local_p.
7103 We use this fact to avoid need for another target hook and implement
7104 the logic using binds_local_p and just special cases where
7105 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
7106 the weak definitions (that can be overwritten at linktime by other
7107 definition from different object file) and when resolution info is available
7108 we simply use the knowledge passed to us by linker plugin. */
7110 decl_binds_to_current_def_p (const_tree decl
)
7112 gcc_assert (DECL_P (decl
));
7113 if (!targetm
.binds_local_p (decl
))
7115 if (!TREE_PUBLIC (decl
))
7118 /* When resolution is available, just use it. */
7119 if (symtab_node
*node
= symtab_node::get (decl
))
7121 if (node
->resolution
!= LDPR_UNKNOWN
7122 && !node
->can_be_discarded_p ())
7123 return resolution_to_local_definition_p (node
->resolution
);
7126 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
7127 binds locally but still can be overwritten), DECL_COMMON (can be merged
7128 with a non-common definition somewhere in the same module) or
7130 This rely on fact that binds_local_p behave as decl_replaceable_p
7131 for all other declaration types. */
7132 if (DECL_WEAK (decl
))
7134 if (DECL_COMMON (decl
)
7135 && (DECL_INITIAL (decl
) == NULL
7136 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
7138 if (DECL_EXTERNAL (decl
))
7143 /* A replaceable function or variable is one which may be replaced
7144 at link-time with an entirely different definition, provided that the
7145 replacement has the same type. For example, functions declared
7146 with __attribute__((weak)) on most systems are replaceable.
7148 COMDAT functions are not replaceable, since all definitions of the
7149 function must be equivalent. It is important that COMDAT functions
7150 not be treated as replaceable so that use of C++ template
7151 instantiations is not penalized. */
7154 decl_replaceable_p (tree decl
)
7156 gcc_assert (DECL_P (decl
));
7157 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
7159 if (!flag_semantic_interposition
7160 && !DECL_WEAK (decl
))
7162 return !decl_binds_to_current_def_p (decl
);
7165 /* Default function to output code that will globalize a label. A
7166 target must define GLOBAL_ASM_OP or provide its own function to
7167 globalize a label. */
7168 #ifdef GLOBAL_ASM_OP
7170 default_globalize_label (FILE * stream
, const char *name
)
7172 fputs (GLOBAL_ASM_OP
, stream
);
7173 assemble_name (stream
, name
);
7174 putc ('\n', stream
);
7176 #endif /* GLOBAL_ASM_OP */
7178 /* Default function to output code that will globalize a declaration. */
7180 default_globalize_decl_name (FILE * stream
, tree decl
)
7182 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7183 targetm
.asm_out
.globalize_label (stream
, name
);
7186 /* Default function to output a label for unwind information. The
7187 default is to do nothing. A target that needs nonlocal labels for
7188 unwind information must provide its own function to do this. */
7190 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7191 tree decl ATTRIBUTE_UNUSED
,
7192 int for_eh ATTRIBUTE_UNUSED
,
7193 int empty ATTRIBUTE_UNUSED
)
7197 /* Default function to output a label to divide up the exception table.
7198 The default is to do nothing. A target that needs/wants to divide
7199 up the table must provide it's own function to do this. */
7201 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7205 /* This is how to output an internal numbered label where PREFIX is
7206 the class of label and LABELNO is the number within the class. */
7209 default_generate_internal_label (char *buf
, const char *prefix
,
7210 unsigned long labelno
)
7212 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7215 /* This is how to output an internal numbered label where PREFIX is
7216 the class of label and LABELNO is the number within the class. */
7219 default_internal_label (FILE *stream
, const char *prefix
,
7220 unsigned long labelno
)
7222 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7223 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7224 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7228 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7231 default_asm_declare_constant_name (FILE *file
, const char *name
,
7232 const_tree exp ATTRIBUTE_UNUSED
,
7233 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7235 assemble_label (file
, name
);
7238 /* This is the default behavior at the beginning of a file. It's
7239 controlled by two other target-hook toggles. */
7241 default_file_start (void)
7243 if (targetm
.asm_file_start_app_off
7244 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7245 fputs (ASM_APP_OFF
, asm_out_file
);
7247 if (targetm
.asm_file_start_file_directive
)
7249 /* LTO produced units have no meaningful main_input_filename. */
7251 output_file_directive (asm_out_file
, "<artificial>");
7253 output_file_directive (asm_out_file
, main_input_filename
);
7257 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7258 which emits a special section directive used to indicate whether or
7259 not this object file needs an executable stack. This is primarily
7260 a GNU extension to ELF but could be used on other targets. */
7262 int trampolines_created
;
7265 file_end_indicate_exec_stack (void)
7267 unsigned int flags
= SECTION_DEBUG
;
7268 if (trampolines_created
)
7269 flags
|= SECTION_CODE
;
7271 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7274 /* Emit a special section directive to indicate that this object file
7275 was compiled with -fsplit-stack. This is used to let the linker
7276 detect calls between split-stack code and non-split-stack code, so
7277 that it can modify the split-stack code to allocate a sufficiently
7278 large stack. We emit another special section if there are any
7279 functions in this file which have the no_split_stack attribute, to
7280 prevent the linker from warning about being unable to convert the
7281 functions if they call non-split-stack code. */
7284 file_end_indicate_split_stack (void)
7286 if (flag_split_stack
)
7288 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7290 if (saw_no_split_stack
)
7291 switch_to_section (get_section (".note.GNU-no-split-stack",
7292 SECTION_DEBUG
, NULL
));
7296 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7297 a get_unnamed_section callback. */
7300 output_section_asm_op (const void *directive
)
7302 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7305 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7306 the current section is NEW_SECTION. */
7309 switch_to_section (section
*new_section
)
7311 if (in_section
== new_section
)
7314 if (new_section
->common
.flags
& SECTION_FORGET
)
7317 in_section
= new_section
;
7319 switch (SECTION_STYLE (new_section
))
7322 targetm
.asm_out
.named_section (new_section
->named
.name
,
7323 new_section
->named
.common
.flags
,
7324 new_section
->named
.decl
);
7327 case SECTION_UNNAMED
:
7328 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7331 case SECTION_NOSWITCH
:
7336 new_section
->common
.flags
|= SECTION_DECLARED
;
7339 /* If block symbol SYMBOL has not yet been assigned an offset, place
7340 it at the end of its block. */
7343 place_block_symbol (rtx symbol
)
7345 unsigned HOST_WIDE_INT size
, mask
, offset
;
7346 struct constant_descriptor_rtx
*desc
;
7347 unsigned int alignment
;
7348 struct object_block
*block
;
7351 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7352 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7355 /* Work out the symbol's size and alignment. */
7356 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7358 desc
= SYMBOL_REF_CONSTANT (symbol
);
7359 alignment
= desc
->align
;
7360 size
= GET_MODE_SIZE (desc
->mode
);
7362 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7364 decl
= SYMBOL_REF_DECL (symbol
);
7365 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7366 alignment
= DECL_ALIGN (decl
);
7367 size
= get_constant_size (DECL_INITIAL (decl
));
7368 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7369 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7370 && asan_protect_global (DECL_INITIAL (decl
)))
7372 size
+= asan_red_zone_size (size
);
7373 alignment
= MAX (alignment
,
7374 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7379 struct symtab_node
*snode
;
7380 decl
= SYMBOL_REF_DECL (symbol
);
7382 snode
= symtab_node::get (decl
);
7385 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7387 gcc_assert (MEM_P (target
)
7388 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7389 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7390 target
= XEXP (target
, 0);
7391 place_block_symbol (target
);
7392 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7395 alignment
= get_variable_align (decl
);
7396 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7397 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7398 && asan_protect_global (decl
))
7400 size
+= asan_red_zone_size (size
);
7401 alignment
= MAX (alignment
,
7402 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7406 /* Calculate the object's offset from the start of the block. */
7407 block
= SYMBOL_REF_BLOCK (symbol
);
7408 mask
= alignment
/ BITS_PER_UNIT
- 1;
7409 offset
= (block
->size
+ mask
) & ~mask
;
7410 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7412 /* Record the block's new alignment and size. */
7413 block
->alignment
= MAX (block
->alignment
, alignment
);
7414 block
->size
= offset
+ size
;
7416 vec_safe_push (block
->objects
, symbol
);
7419 /* Return the anchor that should be used to address byte offset OFFSET
7420 from the first object in BLOCK. MODEL is the TLS model used
7424 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7425 enum tls_model model
)
7428 unsigned int begin
, middle
, end
;
7429 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7432 /* Work out the anchor's offset. Use an offset of 0 for the first
7433 anchor so that we don't pessimize the case where we take the address
7434 of a variable at the beginning of the block. This is particularly
7435 useful when a block has only one variable assigned to it.
7437 We try to place anchors RANGE bytes apart, so there can then be
7438 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7439 a ptr_mode offset. With some target settings, the lowest such
7440 anchor might be out of range for the lowest ptr_mode offset;
7441 likewise the highest anchor for the highest offset. Use anchors
7442 at the extreme ends of the ptr_mode range in such cases.
7444 All arithmetic uses unsigned integers in order to avoid
7446 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7447 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7448 range
= max_offset
- min_offset
+ 1;
7453 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7456 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7457 delta
-= delta
% range
;
7460 offset
= (HOST_WIDE_INT
) (-delta
);
7464 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7465 delta
-= delta
% range
;
7466 if (delta
> bias
- 1)
7468 offset
= (HOST_WIDE_INT
) delta
;
7472 /* Do a binary search to see if there's already an anchor we can use.
7473 Set BEGIN to the new anchor's index if not. */
7475 end
= vec_safe_length (block
->anchors
);
7476 while (begin
!= end
)
7478 middle
= (end
+ begin
) / 2;
7479 anchor
= (*block
->anchors
)[middle
];
7480 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7482 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7484 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7486 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7492 /* Create a new anchor with a unique label. */
7493 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7494 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7495 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7496 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7498 /* Insert it at index BEGIN. */
7499 vec_safe_insert (block
->anchors
, begin
, anchor
);
7503 /* Output the objects in BLOCK. */
7506 output_object_block (struct object_block
*block
)
7508 struct constant_descriptor_rtx
*desc
;
7510 HOST_WIDE_INT offset
;
7514 if (!block
->objects
)
7517 /* Switch to the section and make sure that the first byte is
7518 suitably aligned. */
7519 /* Special case VTV comdat sections similar to assemble_variable. */
7520 if (SECTION_STYLE (block
->sect
) == SECTION_NAMED
7521 && block
->sect
->named
.name
7522 && (strcmp (block
->sect
->named
.name
, ".vtable_map_vars") == 0))
7523 handle_vtv_comdat_section (block
->sect
, block
->sect
->named
.decl
);
7525 switch_to_section (block
->sect
);
7527 assemble_align (block
->alignment
);
7529 /* Define the values of all anchors relative to the current section
7531 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7532 targetm
.asm_out
.output_anchor (symbol
);
7534 /* Output the objects themselves. */
7536 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7538 /* Move to the object's offset, padding with zeros if necessary. */
7539 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7540 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7541 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7543 desc
= SYMBOL_REF_CONSTANT (symbol
);
7544 /* Pass 1 for align as we have already laid out everything in the block.
7545 So aligning shouldn't be necessary. */
7546 output_constant_pool_1 (desc
, 1);
7547 offset
+= GET_MODE_SIZE (desc
->mode
);
7549 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7552 decl
= SYMBOL_REF_DECL (symbol
);
7553 assemble_constant_contents
7554 (DECL_INITIAL (decl
), XSTR (symbol
, 0), DECL_ALIGN (decl
));
7556 size
= get_constant_size (DECL_INITIAL (decl
));
7558 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7559 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7560 && asan_protect_global (DECL_INITIAL (decl
)))
7562 size
= asan_red_zone_size (size
);
7563 assemble_zeros (size
);
7570 decl
= SYMBOL_REF_DECL (symbol
);
7571 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7572 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7574 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7575 && asan_protect_global (decl
))
7577 size
= asan_red_zone_size (size
);
7578 assemble_zeros (size
);
7585 /* A callback for qsort to compare object_blocks. */
7588 output_object_block_compare (const void *x
, const void *y
)
7590 object_block
*p1
= *(object_block
* const*)x
;
7591 object_block
*p2
= *(object_block
* const*)y
;
7593 if (p1
->sect
->common
.flags
& SECTION_NAMED
7594 && !(p2
->sect
->common
.flags
& SECTION_NAMED
))
7597 if (!(p1
->sect
->common
.flags
& SECTION_NAMED
)
7598 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7601 if (p1
->sect
->common
.flags
& SECTION_NAMED
7602 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7603 return strcmp (p1
->sect
->named
.name
, p2
->sect
->named
.name
);
7605 unsigned f1
= p1
->sect
->common
.flags
;
7606 unsigned f2
= p2
->sect
->common
.flags
;
7609 return f1
< f2
? -1 : 1;
7612 /* Output the definitions of all object_blocks. */
7615 output_object_blocks (void)
7617 vec
<object_block
*, va_heap
> v
;
7618 v
.create (object_block_htab
->elements ());
7620 hash_table
<object_block_hasher
>::iterator hi
;
7622 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab
, obj
, object_block
*, hi
)
7625 /* Sort them in order to output them in a deterministic manner,
7626 otherwise we may get .rodata sections in different orders with
7628 v
.qsort (output_object_block_compare
);
7630 FOR_EACH_VEC_ELT (v
, i
, obj
)
7631 output_object_block (obj
);
7636 /* This function provides a possible implementation of the
7637 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7638 by -frecord-gcc-switches it creates a new mergeable, string section in the
7639 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7640 contains the switches in ASCII format.
7642 FIXME: This code does not correctly handle double quote characters
7643 that appear inside strings, (it strips them rather than preserving them).
7644 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7645 characters - instead it treats them as sub-string separators. Since
7646 we want to emit NUL strings terminators into the object file we have to use
7650 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7654 case SWITCH_TYPE_PASSED
:
7655 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7656 ASM_OUTPUT_SKIP (asm_out_file
, HOST_WIDE_INT_1U
);
7659 case SWITCH_TYPE_DESCRIPTIVE
:
7662 /* Distinguish between invocations where name is NULL. */
7663 static bool started
= false;
7669 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7673 | (SECTION_ENTSIZE
& 1),
7675 switch_to_section (sec
);
7684 /* The return value is currently ignored by the caller, but must be 0.
7685 For -fverbose-asm the return value would be the number of characters
7686 emitted into the assembler file. */
7690 /* Emit text to declare externally defined symbols. It is needed to
7691 properly support non-default visibility. */
7693 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7695 const char *name ATTRIBUTE_UNUSED
)
7697 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7698 set in order to avoid putting out names that are never really
7699 used. Always output visibility specified in the source. */
7700 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7701 && (DECL_VISIBILITY_SPECIFIED (decl
)
7702 || targetm
.binds_local_p (decl
)))
7703 maybe_assemble_visibility (decl
);
7706 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7709 default_asm_output_source_filename (FILE *file
, const char *name
)
7711 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7712 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7714 fprintf (file
, "\t.file\t");
7715 output_quoted_string (file
, name
);
7720 /* Output a file name in the form wanted by System V. */
7723 output_file_directive (FILE *asm_file
, const char *input_name
)
7728 if (input_name
== NULL
)
7729 input_name
= "<stdin>";
7731 input_name
= remap_debug_filename (input_name
);
7733 len
= strlen (input_name
);
7734 na
= input_name
+ len
;
7736 /* NA gets INPUT_NAME sans directory names. */
7737 while (na
> input_name
)
7739 if (IS_DIR_SEPARATOR (na
[-1]))
7744 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7747 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7750 make_debug_expr_from_rtl (const_rtx exp
)
7752 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7753 machine_mode mode
= GET_MODE (exp
);
7756 DECL_ARTIFICIAL (ddecl
) = 1;
7757 if (REG_P (exp
) && REG_EXPR (exp
))
7758 type
= TREE_TYPE (REG_EXPR (exp
));
7759 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7760 type
= TREE_TYPE (MEM_EXPR (exp
));
7763 if (type
&& TYPE_MODE (type
) == mode
)
7764 TREE_TYPE (ddecl
) = type
;
7766 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7767 SET_DECL_MODE (ddecl
, mode
);
7768 dval
= gen_rtx_DEBUG_EXPR (mode
);
7769 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7770 SET_DECL_RTL (ddecl
, dval
);
7774 #ifdef ELF_ASCII_ESCAPES
7775 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7778 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7783 fputs (STRING_ASM_OP
, f
);
7788 escape
= ELF_ASCII_ESCAPES
[c
];
7796 putc ('0'+((c
>>6)&7), f
);
7797 putc ('0'+((c
>>3)&7), f
);
7798 putc ('0'+(c
&7), f
);
7811 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7814 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7816 const char *limit
= s
+ len
;
7817 const char *last_null
= NULL
;
7818 unsigned bytes_in_chunk
= 0;
7822 for (; s
< limit
; s
++)
7826 if (bytes_in_chunk
>= 60)
7835 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7842 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7844 if (bytes_in_chunk
> 0)
7851 default_elf_asm_output_limited_string (f
, s
);
7856 if (bytes_in_chunk
== 0)
7857 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7860 escape
= ELF_ASCII_ESCAPES
[c
];
7869 putc ('0'+((c
>>6)&7), f
);
7870 putc ('0'+((c
>>3)&7), f
);
7871 putc ('0'+(c
&7), f
);
7872 bytes_in_chunk
+= 4;
7877 bytes_in_chunk
+= 2;
7884 if (bytes_in_chunk
> 0)
7892 static GTY(()) section
*elf_init_array_section
;
7893 static GTY(()) section
*elf_fini_array_section
;
7896 get_elf_initfini_array_priority_section (int priority
,
7900 if (priority
!= DEFAULT_INIT_PRIORITY
)
7903 sprintf (buf
, "%s.%.5u",
7904 constructor_p
? ".init_array" : ".fini_array",
7906 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7912 if (elf_init_array_section
== NULL
)
7913 elf_init_array_section
7914 = get_section (".init_array",
7915 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7916 sec
= elf_init_array_section
;
7920 if (elf_fini_array_section
== NULL
)
7921 elf_fini_array_section
7922 = get_section (".fini_array",
7923 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7924 sec
= elf_fini_array_section
;
7930 /* Use .init_array section for constructors. */
7933 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7935 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7937 assemble_addr_to_section (symbol
, sec
);
7940 /* Use .fini_array section for destructors. */
7943 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7945 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7947 assemble_addr_to_section (symbol
, sec
);
7950 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7952 This is a bit of a cheat. The real default is a no-op, but this
7953 hook is the default for all targets with a .ident directive. */
7956 default_asm_output_ident_directive (const char *ident_str
)
7958 const char *ident_asm_op
= "\t.ident\t";
7960 /* If we are still in the front end, do not write out the string
7961 to asm_out_file. Instead, add a fake top-level asm statement.
7962 This allows the front ends to use this hook without actually
7963 writing to asm_out_file, to handle #ident or Pragma Ident. */
7964 if (symtab
->state
== PARSING
)
7966 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7967 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7970 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7974 /* This function ensures that vtable_map variables are not only
7975 in the comdat section, but that each variable has its own unique
7976 comdat name. Without this the variables end up in the same section
7977 with a single comdat name.
7979 FIXME: resolve_unique_section needs to deal better with
7980 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
7981 that is fixed, this if-else statement can be replaced with
7982 a single call to "switch_to_section (sect)". */
7985 handle_vtv_comdat_section (section
*sect
, const_tree decl ATTRIBUTE_UNUSED
)
7987 #if defined (OBJECT_FORMAT_ELF)
7988 targetm
.asm_out
.named_section (sect
->named
.name
,
7989 sect
->named
.common
.flags
7994 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
7995 Therefore the following check is used.
7996 In case a the target is PE or COFF a comdat group section
7997 is created, e.g. .vtable_map_vars$foo. The linker places
7998 everything in .vtable_map_vars at the end.
8000 A fix could be made in
8001 gcc/config/i386/winnt.c: i386_pe_unique_section. */
8006 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
8007 name
= ACONCAT ((sect
->named
.name
, "$",
8008 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
8010 name
= ACONCAT ((sect
->named
.name
, "$",
8011 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
8014 targetm
.asm_out
.named_section (name
,
8015 sect
->named
.common
.flags
8021 switch_to_section (sect
);
8025 #include "gt-varasm.h"