1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2017 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 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
848 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
854 && (align
& (align
- 1)) == 0)
856 const char *prefix
= function_mergeable_rodata_prefix ();
857 char *name
= (char *) alloca (strlen (prefix
) + 30);
859 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
860 flags
|= (align
/ 8) | SECTION_MERGE
;
861 return get_section (name
, flags
, NULL
);
863 return readonly_data_section
;
866 /* Given NAME, a putative register name, discard any customary prefixes. */
869 strip_reg_name (const char *name
)
871 #ifdef REGISTER_PREFIX
872 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
873 name
+= strlen (REGISTER_PREFIX
);
875 if (name
[0] == '%' || name
[0] == '#')
880 /* The user has asked for a DECL to have a particular name. Set (or
881 change) it in such a way that we don't prefix an underscore to
884 set_user_assembler_name (tree decl
, const char *name
)
886 char *starred
= (char *) alloca (strlen (name
) + 2);
888 strcpy (starred
+ 1, name
);
889 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
890 SET_DECL_RTL (decl
, NULL_RTX
);
893 /* Decode an `asm' spec for a declaration as a register name.
894 Return the register number, or -1 if nothing specified,
895 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
896 or -3 if ASMSPEC is `cc' and is not recognized,
897 or -4 if ASMSPEC is `memory' and is not recognized.
898 Accept an exact spelling or a decimal number.
899 Prefixes such as % are optional. */
902 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
904 /* Presume just one register is clobbered. */
911 /* Get rid of confusing prefixes. */
912 asmspec
= strip_reg_name (asmspec
);
914 /* Allow a decimal number as a "register name". */
915 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
916 if (! ISDIGIT (asmspec
[i
]))
918 if (asmspec
[0] != 0 && i
< 0)
921 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
927 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
929 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
932 #ifdef OVERLAPPING_REGISTER_NAMES
936 const char *const name
;
939 } table
[] = OVERLAPPING_REGISTER_NAMES
;
941 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
943 && ! strcmp (asmspec
, table
[i
].name
))
945 *pnregs
= table
[i
].nregs
;
946 return table
[i
].number
;
949 #endif /* OVERLAPPING_REGISTER_NAMES */
951 #ifdef ADDITIONAL_REGISTER_NAMES
953 static const struct { const char *const name
; const int number
; } table
[]
954 = ADDITIONAL_REGISTER_NAMES
;
956 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
958 && ! strcmp (asmspec
, table
[i
].name
)
959 && reg_names
[table
[i
].number
][0])
960 return table
[i
].number
;
962 #endif /* ADDITIONAL_REGISTER_NAMES */
964 if (!strcmp (asmspec
, "memory"))
967 if (!strcmp (asmspec
, "cc"))
977 decode_reg_name (const char *name
)
980 return decode_reg_name_and_count (name
, &count
);
984 /* Return true if DECL's initializer is suitable for a BSS section. */
987 bss_initializer_p (const_tree decl
)
989 /* Do not put non-common constants into the .bss section, they belong in
990 a readonly section. */
991 return ((!TREE_READONLY (decl
) || DECL_COMMON (decl
))
992 && (DECL_INITIAL (decl
) == NULL
993 /* In LTO we have no errors in program; error_mark_node is used
994 to mark offlined constructors. */
995 || (DECL_INITIAL (decl
) == error_mark_node
997 || (flag_zero_initialized_in_bss
998 && initializer_zerop (DECL_INITIAL (decl
)))));
1001 /* Compute the alignment of variable specified by DECL.
1002 DONT_OUTPUT_DATA is from assemble_variable. */
1005 align_variable (tree decl
, bool dont_output_data
)
1007 unsigned int align
= DECL_ALIGN (decl
);
1009 /* In the case for initialing an array whose length isn't specified,
1010 where we have not yet been able to do the layout,
1011 figure out the proper alignment now. */
1012 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1013 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1014 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1016 /* Some object file formats have a maximum alignment which they support.
1017 In particular, a.out format supports a maximum alignment of 4. */
1018 if (align
> MAX_OFILE_ALIGNMENT
)
1020 error ("alignment of %q+D is greater than maximum object "
1021 "file alignment %d", decl
,
1022 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1023 align
= MAX_OFILE_ALIGNMENT
;
1026 if (! DECL_USER_ALIGN (decl
))
1028 #ifdef DATA_ABI_ALIGNMENT
1029 unsigned int data_abi_align
1030 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1031 /* For backwards compatibility, don't assume the ABI alignment for
1033 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1034 align
= data_abi_align
;
1037 /* On some machines, it is good to increase alignment sometimes.
1038 But as DECL_ALIGN is used both for actually emitting the variable
1039 and for code accessing the variable as guaranteed alignment, we
1040 can only increase the alignment if it is a performance optimization
1041 if the references to it must bind to the current definition. */
1042 if (decl_binds_to_current_def_p (decl
)
1043 && !DECL_VIRTUAL_P (decl
))
1045 #ifdef DATA_ALIGNMENT
1046 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1047 /* Don't increase alignment too much for TLS variables - TLS space
1049 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1052 if (DECL_INITIAL (decl
) != 0
1053 /* In LTO we have no errors in program; error_mark_node is used
1054 to mark offlined constructors. */
1055 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1057 unsigned int const_align
1058 = targetm
.constant_alignment (DECL_INITIAL (decl
), align
);
1059 /* Don't increase alignment too much for TLS variables - TLS
1060 space is too precious. */
1061 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1062 align
= const_align
;
1067 /* Reset the alignment in case we have made it tighter, so we can benefit
1068 from it in get_pointer_alignment. */
1069 SET_DECL_ALIGN (decl
, align
);
1072 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1073 beyond what align_variable returned. */
1076 get_variable_align (tree decl
)
1078 unsigned int align
= DECL_ALIGN (decl
);
1080 /* For user aligned vars or static vars align_variable already did
1082 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1085 #ifdef DATA_ABI_ALIGNMENT
1086 if (DECL_THREAD_LOCAL_P (decl
))
1087 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1090 /* For decls that bind to the current definition, align_variable
1091 did also everything, except for not assuming ABI required alignment
1092 of TLS variables. For other vars, increase the alignment here
1093 as an optimization. */
1094 if (!decl_binds_to_current_def_p (decl
))
1096 /* On some machines, it is good to increase alignment sometimes. */
1097 #ifdef DATA_ALIGNMENT
1098 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1099 /* Don't increase alignment too much for TLS variables - TLS space
1101 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1104 if (DECL_INITIAL (decl
) != 0
1105 /* In LTO we have no errors in program; error_mark_node is used
1106 to mark offlined constructors. */
1107 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1109 unsigned int const_align
1110 = targetm
.constant_alignment (DECL_INITIAL (decl
), align
);
1111 /* Don't increase alignment too much for TLS variables - TLS space
1113 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1114 align
= const_align
;
1121 /* Return the section into which the given VAR_DECL or CONST_DECL
1122 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1123 section should be used wherever possible. */
1126 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1128 addr_space_t as
= ADDR_SPACE_GENERIC
;
1130 varpool_node
*vnode
= varpool_node::get (decl
);
1133 vnode
= vnode
->ultimate_alias_target ();
1137 if (TREE_TYPE (decl
) != error_mark_node
)
1138 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1140 /* We need the constructor to figure out reloc flag. */
1142 vnode
->get_constructor ();
1144 if (DECL_COMMON (decl
))
1146 /* If the decl has been given an explicit section name, or it resides
1147 in a non-generic address space, then it isn't common, and shouldn't
1148 be handled as such. */
1149 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1150 && ADDR_SPACE_GENERIC_P (as
));
1151 if (DECL_THREAD_LOCAL_P (decl
))
1152 return tls_comm_section
;
1153 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1154 return comm_section
;
1157 if (DECL_INITIAL (decl
) == error_mark_node
)
1158 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1159 else if (DECL_INITIAL (decl
))
1160 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1164 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1165 if (IN_NAMED_SECTION (decl
))
1167 section
*sect
= get_named_section (decl
, NULL
, reloc
);
1169 if ((sect
->common
.flags
& SECTION_BSS
) && !bss_initializer_p (decl
))
1171 error_at (DECL_SOURCE_LOCATION (decl
),
1172 "only zero initializers are allowed in section %qs",
1174 DECL_INITIAL (decl
) = error_mark_node
;
1179 if (ADDR_SPACE_GENERIC_P (as
)
1180 && !DECL_THREAD_LOCAL_P (decl
)
1181 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1182 && bss_initializer_p (decl
))
1184 if (!TREE_PUBLIC (decl
)
1185 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1186 && asan_protect_global (decl
)))
1187 return lcomm_section
;
1188 if (bss_noswitch_section
)
1189 return bss_noswitch_section
;
1192 return targetm
.asm_out
.select_section (decl
, reloc
,
1193 get_variable_align (decl
));
1196 /* Return the block into which object_block DECL should be placed. */
1198 static struct object_block
*
1199 get_block_for_decl (tree decl
)
1205 /* The object must be defined in this translation unit. */
1206 if (DECL_EXTERNAL (decl
))
1209 /* There's no point using object blocks for something that is
1210 isolated by definition. */
1211 if (DECL_COMDAT_GROUP (decl
))
1215 /* We can only calculate block offsets if the decl has a known
1217 if (DECL_SIZE_UNIT (decl
) == NULL
)
1219 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1222 /* Find out which section should contain DECL. We cannot put it into
1223 an object block if it requires a standalone definition. */
1225 align_variable (decl
, 0);
1226 sect
= get_variable_section (decl
, true);
1227 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1230 return get_block_for_section (sect
);
1233 /* Make sure block symbol SYMBOL is in block BLOCK. */
1236 change_symbol_block (rtx symbol
, struct object_block
*block
)
1238 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1240 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1241 SYMBOL_REF_BLOCK (symbol
) = block
;
1245 /* Return true if it is possible to put DECL in an object_block. */
1248 use_blocks_for_decl_p (tree decl
)
1250 struct symtab_node
*snode
;
1252 /* Only data DECLs can be placed into object blocks. */
1253 if (!VAR_P (decl
) && TREE_CODE (decl
) != CONST_DECL
)
1256 /* Detect decls created by dw2_force_const_mem. Such decls are
1257 special because DECL_INITIAL doesn't specify the decl's true value.
1258 dw2_output_indirect_constants will instead call assemble_variable
1259 with dont_output_data set to 1 and then print the contents itself. */
1260 if (DECL_INITIAL (decl
) == decl
)
1263 /* If this decl is an alias, then we don't want to emit a
1266 && (snode
= symtab_node::get (decl
)) != NULL
1270 return targetm
.use_blocks_for_decl_p (decl
);
1273 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1274 until we find an identifier that is not itself a transparent alias.
1275 Modify the alias passed to it by reference (and all aliases on the
1276 way to the ultimate target), such that they do not have to be
1277 followed again, and return the ultimate target of the alias
1281 ultimate_transparent_alias_target (tree
*alias
)
1283 tree target
= *alias
;
1285 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1287 gcc_assert (TREE_CHAIN (target
));
1288 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1289 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1290 && ! TREE_CHAIN (target
));
1297 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1298 have static storage duration. In other words, it should not be an
1299 automatic variable, including PARM_DECLs.
1301 There is, however, one exception: this function handles variables
1302 explicitly placed in a particular register by the user.
1304 This is never called for PARM_DECL nodes. */
1307 make_decl_rtl (tree decl
)
1309 const char *name
= 0;
1314 /* Check that we are not being given an automatic variable. */
1315 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1316 && TREE_CODE (decl
) != RESULT_DECL
);
1318 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1319 gcc_assert (!VAR_P (decl
)
1320 || TREE_STATIC (decl
)
1321 || TREE_PUBLIC (decl
)
1322 || DECL_EXTERNAL (decl
)
1323 || DECL_REGISTER (decl
));
1325 /* And that we were not given a type or a label. */
1326 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1327 && TREE_CODE (decl
) != LABEL_DECL
);
1329 /* For a duplicate declaration, we can be called twice on the
1330 same DECL node. Don't discard the RTL already made. */
1331 if (DECL_RTL_SET_P (decl
))
1333 /* If the old RTL had the wrong mode, fix the mode. */
1334 x
= DECL_RTL (decl
);
1335 if (GET_MODE (x
) != DECL_MODE (decl
))
1336 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1338 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1341 /* ??? Another way to do this would be to maintain a hashed
1342 table of such critters. Instead of adding stuff to a DECL
1343 to give certain attributes to it, we could use an external
1344 hash map from DECL to set of attributes. */
1346 /* Let the target reassign the RTL if it wants.
1347 This is necessary, for example, when one machine specific
1348 decl attribute overrides another. */
1349 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1351 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1352 on the new decl information. */
1354 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1355 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1356 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1361 /* If this variable belongs to the global constant pool, retrieve the
1362 pre-computed RTL or recompute it in LTO mode. */
1363 if (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
1365 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1369 id
= DECL_ASSEMBLER_NAME (decl
);
1370 if (TREE_CODE (decl
) == FUNCTION_DECL
1371 && cgraph_node::get (decl
)
1372 && cgraph_node::get (decl
)->instrumentation_clone
)
1373 ultimate_transparent_alias_target (&id
);
1374 name
= IDENTIFIER_POINTER (id
);
1376 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1377 && DECL_REGISTER (decl
))
1379 error ("register name not specified for %q+D", decl
);
1381 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1383 const char *asmspec
= name
+1;
1384 machine_mode mode
= DECL_MODE (decl
);
1385 reg_number
= decode_reg_name (asmspec
);
1386 /* First detect errors in declaring global registers. */
1387 if (reg_number
== -1)
1388 error ("register name not specified for %q+D", decl
);
1389 else if (reg_number
< 0)
1390 error ("invalid register name for %q+D", decl
);
1391 else if (mode
== BLKmode
)
1392 error ("data type of %q+D isn%'t suitable for a register",
1394 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1395 error ("the register specified for %q+D cannot be accessed"
1396 " by the current target", decl
);
1397 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1398 error ("the register specified for %q+D is not general enough"
1399 " to be used as a register variable", decl
);
1400 else if (!targetm
.hard_regno_mode_ok (reg_number
, mode
))
1401 error ("register specified for %q+D isn%'t suitable for data type",
1403 /* Now handle properly declared static register variables. */
1408 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1410 DECL_INITIAL (decl
) = 0;
1411 error ("global register variable has initial value");
1413 if (TREE_THIS_VOLATILE (decl
))
1414 warning (OPT_Wvolatile_register_var
,
1415 "optimization may eliminate reads and/or "
1416 "writes to register variables");
1418 /* If the user specified one of the eliminables registers here,
1419 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1420 confused with that register and be eliminated. This usage is
1421 somewhat suspect... */
1423 SET_DECL_RTL (decl
, gen_raw_REG (mode
, reg_number
));
1424 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1425 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1427 if (TREE_STATIC (decl
))
1429 /* Make this register global, so not usable for anything
1431 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1432 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1433 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1435 nregs
= hard_regno_nregs (reg_number
, mode
);
1437 globalize_reg (decl
, reg_number
+ --nregs
);
1440 /* As a register variable, it has no section. */
1443 /* Avoid internal errors from invalid register
1445 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1446 DECL_HARD_REGISTER (decl
) = 0;
1447 /* Also avoid SSA inconsistencies by pretending this is an external
1449 DECL_EXTERNAL (decl
) = 1;
1452 /* Now handle ordinary static variables and functions (in memory).
1453 Also handle vars declared register invalidly. */
1454 else if (name
[0] == '*')
1456 #ifdef REGISTER_PREFIX
1457 if (strlen (REGISTER_PREFIX
) != 0)
1459 reg_number
= decode_reg_name (name
);
1460 if (reg_number
>= 0 || reg_number
== -3)
1461 error ("register name given for non-register variable %q+D", decl
);
1466 /* Specifying a section attribute on a variable forces it into a
1467 non-.bss section, and thus it cannot be common. */
1468 /* FIXME: In general this code should not be necessary because
1469 visibility pass is doing the same work. But notice_global_symbol
1470 is called early and it needs to make DECL_RTL to get the name.
1471 we take care of recomputing the DECL_RTL after visibility is changed. */
1473 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1474 && DECL_SECTION_NAME (decl
) != NULL
1475 && DECL_INITIAL (decl
) == NULL_TREE
1476 && DECL_COMMON (decl
))
1477 DECL_COMMON (decl
) = 0;
1479 /* Variables can't be both common and weak. */
1480 if (VAR_P (decl
) && DECL_WEAK (decl
))
1481 DECL_COMMON (decl
) = 0;
1483 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1484 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1487 machine_mode address_mode
= Pmode
;
1488 if (TREE_TYPE (decl
) != error_mark_node
)
1490 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1491 address_mode
= targetm
.addr_space
.address_mode (as
);
1493 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1495 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1496 SET_SYMBOL_REF_DECL (x
, decl
);
1498 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1499 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1500 set_mem_attributes (x
, decl
, 1);
1501 SET_DECL_RTL (decl
, x
);
1503 /* Optionally set flags or add text to the name to record information
1504 such as that it is a function name.
1505 If the name is changed, the macro ASM_OUTPUT_LABELREF
1506 will have to know how to strip this information. */
1507 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1510 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1511 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1515 make_decl_rtl_for_debug (tree decl
)
1517 unsigned int save_aliasing_flag
;
1520 if (DECL_RTL_SET_P (decl
))
1521 return DECL_RTL (decl
);
1523 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1524 call new_alias_set. If running with -fcompare-debug, sometimes
1525 we do not want to create alias sets that will throw the alias
1526 numbers off in the comparison dumps. So... clearing
1527 flag_strict_aliasing will keep new_alias_set() from creating a
1529 save_aliasing_flag
= flag_strict_aliasing
;
1530 flag_strict_aliasing
= 0;
1532 rtl
= DECL_RTL (decl
);
1533 /* Reset DECL_RTL back, as various parts of the compiler expects
1534 DECL_RTL set meaning it is actually going to be output. */
1535 SET_DECL_RTL (decl
, NULL
);
1537 flag_strict_aliasing
= save_aliasing_flag
;
1541 /* Output a string of literal assembler code
1542 for an `asm' keyword used between functions. */
1545 assemble_asm (tree string
)
1550 if (TREE_CODE (string
) == ADDR_EXPR
)
1551 string
= TREE_OPERAND (string
, 0);
1553 p
= TREE_STRING_POINTER (string
);
1554 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1557 /* Write the address of the entity given by SYMBOL to SEC. */
1559 assemble_addr_to_section (rtx symbol
, section
*sec
)
1561 switch_to_section (sec
);
1562 assemble_align (POINTER_SIZE
);
1563 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1566 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1567 not) section for PRIORITY. */
1569 get_cdtor_priority_section (int priority
, bool constructor_p
)
1571 /* Buffer conservatively large enough for the full range of a 32-bit
1572 int plus the text below. */
1575 /* ??? This only works reliably with the GNU linker. */
1576 sprintf (buf
, "%s.%.5u",
1577 constructor_p
? ".ctors" : ".dtors",
1578 /* Invert the numbering so the linker puts us in the proper
1579 order; constructors are run from right to left, and the
1580 linker sorts in increasing order. */
1581 MAX_INIT_PRIORITY
- priority
);
1582 return get_section (buf
, SECTION_WRITE
, NULL
);
1586 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1590 if (priority
!= DEFAULT_INIT_PRIORITY
)
1591 sec
= get_cdtor_priority_section (priority
,
1592 /*constructor_p=*/false);
1594 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1596 assemble_addr_to_section (symbol
, sec
);
1599 #ifdef DTORS_SECTION_ASM_OP
1601 default_dtor_section_asm_out_destructor (rtx symbol
,
1602 int priority ATTRIBUTE_UNUSED
)
1604 assemble_addr_to_section (symbol
, dtors_section
);
1609 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1613 if (priority
!= DEFAULT_INIT_PRIORITY
)
1614 sec
= get_cdtor_priority_section (priority
,
1615 /*constructor_p=*/true);
1617 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1619 assemble_addr_to_section (symbol
, sec
);
1622 #ifdef CTORS_SECTION_ASM_OP
1624 default_ctor_section_asm_out_constructor (rtx symbol
,
1625 int priority ATTRIBUTE_UNUSED
)
1627 assemble_addr_to_section (symbol
, ctors_section
);
1631 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1632 a nonzero value if the constant pool should be output before the
1633 start of the function, or a zero value if the pool should output
1634 after the end of the function. The default is to put it before the
1637 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1638 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1641 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1642 to be output to assembler.
1643 Set first_global_object_name and weak_global_object_name as appropriate. */
1646 notice_global_symbol (tree decl
)
1648 const char **t
= &first_global_object_name
;
1650 if (first_global_object_name
1651 || !TREE_PUBLIC (decl
)
1652 || DECL_EXTERNAL (decl
)
1653 || !DECL_NAME (decl
)
1654 || (VAR_P (decl
) && DECL_HARD_REGISTER (decl
))
1655 || (TREE_CODE (decl
) != FUNCTION_DECL
1657 || (DECL_COMMON (decl
)
1658 && (DECL_INITIAL (decl
) == 0
1659 || DECL_INITIAL (decl
) == error_mark_node
)))))
1662 /* We win when global object is found, but it is useful to know about weak
1663 symbol as well so we can produce nicer unique names. */
1664 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1665 t
= &weak_global_object_name
;
1669 tree id
= DECL_ASSEMBLER_NAME (decl
);
1670 ultimate_transparent_alias_target (&id
);
1671 *t
= ggc_strdup (targetm
.strip_name_encoding (IDENTIFIER_POINTER (id
)));
1675 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1676 current function goes into the cold section, so that targets can use
1677 current_function_section during RTL expansion. DECL describes the
1681 decide_function_section (tree decl
)
1683 first_function_block_is_cold
= false;
1685 if (DECL_SECTION_NAME (decl
))
1687 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1688 /* Calls to function_section rely on first_function_block_is_cold
1690 first_function_block_is_cold
= (node
1692 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1695 in_cold_section_p
= first_function_block_is_cold
;
1698 /* Get the function's name, as described by its RTL. This may be
1699 different from the DECL_NAME name used in the source file. */
1701 get_fnname_from_decl (tree decl
)
1703 rtx x
= DECL_RTL (decl
);
1704 gcc_assert (MEM_P (x
));
1706 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1710 /* Output assembler code for the constant pool of a function and associated
1711 with defining the name of the function. DECL describes the function.
1712 NAME is the function's name. For the constant pool, we use the current
1713 constant pool data. */
1716 assemble_start_function (tree decl
, const char *fnname
)
1719 char tmp_label
[100];
1720 bool hot_label_written
= false;
1722 if (crtl
->has_bb_partition
)
1724 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1725 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1726 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1727 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1728 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1729 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1730 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1731 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1733 cold_function_name
= NULL_TREE
;
1737 crtl
->subsections
.hot_section_label
= NULL
;
1738 crtl
->subsections
.cold_section_label
= NULL
;
1739 crtl
->subsections
.hot_section_end_label
= NULL
;
1740 crtl
->subsections
.cold_section_end_label
= NULL
;
1743 /* The following code does not need preprocessing in the assembler. */
1747 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1748 output_constant_pool (fnname
, decl
);
1750 align
= symtab_node::get (decl
)->definition_alignment ();
1752 /* Make sure the not and cold text (code) sections are properly
1753 aligned. This is necessary here in the case where the function
1754 has both hot and cold sections, because we don't want to re-set
1755 the alignment when the section switch happens mid-function. */
1757 if (crtl
->has_bb_partition
)
1759 first_function_block_is_cold
= false;
1761 switch_to_section (unlikely_text_section ());
1762 assemble_align (align
);
1763 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1765 /* When the function starts with a cold section, we need to explicitly
1766 align the hot section and write out the hot section label.
1767 But if the current function is a thunk, we do not have a CFG. */
1769 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1771 switch_to_section (text_section
);
1772 assemble_align (align
);
1773 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1774 hot_label_written
= true;
1775 first_function_block_is_cold
= true;
1777 in_cold_section_p
= first_function_block_is_cold
;
1781 /* Switch to the correct text section for the start of the function. */
1783 switch_to_section (function_section (decl
));
1784 if (crtl
->has_bb_partition
&& !hot_label_written
)
1785 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1787 /* Tell assembler to move to target machine's alignment for functions. */
1788 align
= floor_log2 (align
/ BITS_PER_UNIT
);
1791 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1794 /* Handle a user-specified function alignment.
1795 Note that we still need to align to DECL_ALIGN, as above,
1796 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1797 if (! DECL_USER_ALIGN (decl
)
1798 && align_functions_log
> align
1799 && optimize_function_for_speed_p (cfun
))
1801 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1802 int align_log
= align_functions_log
;
1804 int max_skip
= align_functions
- 1;
1805 if (flag_limit_function_alignment
&& crtl
->max_insn_address
> 0
1806 && max_skip
>= crtl
->max_insn_address
)
1807 max_skip
= crtl
->max_insn_address
- 1;
1809 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1810 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
, align_log
, max_skip
);
1812 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1816 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1817 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1820 if (!DECL_IGNORED_P (decl
))
1821 (*debug_hooks
->begin_function
) (decl
);
1823 /* Make function name accessible from other files, if appropriate. */
1825 if (TREE_PUBLIC (decl
)
1826 || (cgraph_node::get (decl
)->instrumentation_clone
1827 && cgraph_node::get (decl
)->instrumented_version
1828 && TREE_PUBLIC (cgraph_node::get (decl
)->instrumented_version
->decl
)))
1830 notice_global_symbol (decl
);
1832 globalize_decl (decl
);
1834 maybe_assemble_visibility (decl
);
1837 if (DECL_PRESERVE_P (decl
))
1838 targetm
.asm_out
.mark_decl_preserved (fnname
);
1840 unsigned HOST_WIDE_INT patch_area_size
= function_entry_patch_area_size
;
1841 unsigned HOST_WIDE_INT patch_area_entry
= function_entry_patch_area_start
;
1843 tree patchable_function_entry_attr
1844 = lookup_attribute ("patchable_function_entry", DECL_ATTRIBUTES (decl
));
1845 if (patchable_function_entry_attr
)
1847 tree pp_val
= TREE_VALUE (patchable_function_entry_attr
);
1848 tree patchable_function_entry_value1
= TREE_VALUE (pp_val
);
1850 if (tree_fits_uhwi_p (patchable_function_entry_value1
))
1851 patch_area_size
= tree_to_uhwi (patchable_function_entry_value1
);
1855 patch_area_entry
= 0;
1856 if (list_length (pp_val
) > 1)
1858 tree patchable_function_entry_value2
=
1859 TREE_VALUE (TREE_CHAIN (pp_val
));
1861 if (tree_fits_uhwi_p (patchable_function_entry_value2
))
1862 patch_area_entry
= tree_to_uhwi (patchable_function_entry_value2
);
1868 if (patch_area_entry
> patch_area_size
)
1870 if (patch_area_size
> 0)
1871 warning (OPT_Wattributes
, "Patchable function entry > size");
1872 patch_area_entry
= 0;
1875 /* Emit the patching area before the entry label, if any. */
1876 if (patch_area_entry
> 0)
1877 targetm
.asm_out
.print_patchable_function_entry (asm_out_file
,
1878 patch_area_entry
, true);
1880 /* Do any machine/system dependent processing of the function name. */
1881 #ifdef ASM_DECLARE_FUNCTION_NAME
1882 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1884 /* Standard thing is just output label for the function. */
1885 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1886 #endif /* ASM_DECLARE_FUNCTION_NAME */
1888 /* And the area after the label. Record it if we haven't done so yet. */
1889 if (patch_area_size
> patch_area_entry
)
1890 targetm
.asm_out
.print_patchable_function_entry (asm_out_file
,
1891 patch_area_size
-patch_area_entry
,
1892 patch_area_entry
== 0);
1894 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1895 saw_no_split_stack
= true;
1898 /* Output assembler code associated with defining the size of the
1899 function. DECL describes the function. NAME is the function's name. */
1902 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1904 #ifdef ASM_DECLARE_FUNCTION_SIZE
1905 /* We could have switched section in the middle of the function. */
1906 if (crtl
->has_bb_partition
)
1907 switch_to_section (function_section (decl
));
1908 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1910 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1912 output_constant_pool (fnname
, decl
);
1913 switch_to_section (function_section (decl
)); /* need to switch back */
1915 /* Output labels for end of hot/cold text sections (to be used by
1917 if (crtl
->has_bb_partition
)
1919 section
*save_text_section
;
1921 save_text_section
= in_section
;
1922 switch_to_section (unlikely_text_section ());
1923 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
1924 if (cold_function_name
!= NULL_TREE
)
1925 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file
,
1926 IDENTIFIER_POINTER (cold_function_name
),
1929 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1930 if (first_function_block_is_cold
)
1931 switch_to_section (text_section
);
1933 switch_to_section (function_section (decl
));
1934 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1935 switch_to_section (save_text_section
);
1939 /* Assemble code to leave SIZE bytes of zeros. */
1942 assemble_zeros (unsigned HOST_WIDE_INT size
)
1944 /* Do no output if -fsyntax-only. */
1945 if (flag_syntax_only
)
1948 #ifdef ASM_NO_SKIP_IN_TEXT
1949 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1950 so we must output 0s explicitly in the text section. */
1951 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1953 unsigned HOST_WIDE_INT i
;
1954 for (i
= 0; i
< size
; i
++)
1955 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1960 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1963 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1966 assemble_align (int align
)
1968 if (align
> BITS_PER_UNIT
)
1970 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1974 /* Assemble a string constant with the specified C string as contents. */
1977 assemble_string (const char *p
, int size
)
1982 /* If the string is very long, split it up. */
1986 int thissize
= size
- pos
;
1987 if (thissize
> maximum
)
1990 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1998 /* A noswitch_section_callback for lcomm_section. */
2001 emit_local (tree decl ATTRIBUTE_UNUSED
,
2002 const char *name ATTRIBUTE_UNUSED
,
2003 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2004 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2006 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
2007 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
2008 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
2011 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
2012 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
2013 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
2016 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2021 /* A noswitch_section_callback for bss_noswitch_section. */
2023 #if defined ASM_OUTPUT_ALIGNED_BSS
2025 emit_bss (tree decl ATTRIBUTE_UNUSED
,
2026 const char *name ATTRIBUTE_UNUSED
,
2027 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2028 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2030 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
2031 get_variable_align (decl
));
2036 /* A noswitch_section_callback for comm_section. */
2039 emit_common (tree decl ATTRIBUTE_UNUSED
,
2040 const char *name ATTRIBUTE_UNUSED
,
2041 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2042 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2044 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
2045 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
2046 size
, get_variable_align (decl
));
2048 #elif defined ASM_OUTPUT_ALIGNED_COMMON
2049 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
2050 get_variable_align (decl
));
2053 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
2058 /* A noswitch_section_callback for tls_comm_section. */
2061 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
2062 const char *name ATTRIBUTE_UNUSED
,
2063 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2064 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2066 #ifdef ASM_OUTPUT_TLS_COMMON
2067 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2070 sorry ("thread-local COMMON data not implemented");
2075 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2076 NAME is the name of DECL's SYMBOL_REF. */
2079 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2082 unsigned HOST_WIDE_INT size
, rounded
;
2084 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2087 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2088 size
+= asan_red_zone_size (size
);
2090 /* Don't allocate zero bytes of common,
2091 since that means "undefined external" in the linker. */
2095 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2096 so that each uninitialized object starts on such a boundary. */
2097 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2098 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2099 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2101 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2102 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2103 error ("requested alignment for %q+D is greater than "
2104 "implemented alignment of %wu", decl
, rounded
);
2107 /* A subroutine of assemble_variable. Output the label and contents of
2108 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2109 is as for assemble_variable. */
2112 assemble_variable_contents (tree decl
, const char *name
,
2113 bool dont_output_data
)
2115 /* Do any machine/system dependent processing of the object. */
2116 #ifdef ASM_DECLARE_OBJECT_NAME
2117 last_assemble_variable_decl
= decl
;
2118 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2120 /* Standard thing is just output label for the object. */
2121 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2122 #endif /* ASM_DECLARE_OBJECT_NAME */
2124 if (!dont_output_data
)
2126 /* Caller is supposed to use varpool_get_constructor when it wants
2127 to output the body. */
2128 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2129 if (DECL_INITIAL (decl
)
2130 && DECL_INITIAL (decl
) != error_mark_node
2131 && !initializer_zerop (DECL_INITIAL (decl
)))
2132 /* Output the actual data. */
2133 output_constant (DECL_INITIAL (decl
),
2134 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2135 get_variable_align (decl
),
2138 /* Leave space for it. */
2139 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2140 targetm
.asm_out
.decl_end ();
2144 /* Write out assembly for the variable DECL, which is not defined in
2145 the current translation unit. */
2147 assemble_undefined_decl (tree decl
)
2149 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2150 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2153 /* Assemble everything that is needed for a variable or function declaration.
2154 Not used for automatic variables, and not used for function definitions.
2155 Should not be called for variables of incomplete structure type.
2157 TOP_LEVEL is nonzero if this variable has file scope.
2158 AT_END is nonzero if this is the special handling, at end of compilation,
2159 to define things that have had only tentative definitions.
2160 DONT_OUTPUT_DATA if nonzero means don't actually output the
2161 initial value (that will be done by the caller). */
2164 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2165 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2168 rtx decl_rtl
, symbol
;
2171 bool asan_protected
= false;
2173 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2174 gcc_assert (VAR_P (decl
));
2176 /* Emulated TLS had better not get this far. */
2177 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2179 last_assemble_variable_decl
= 0;
2181 /* Normally no need to say anything here for external references,
2182 since assemble_external is called by the language-specific code
2183 when a declaration is first seen. */
2185 if (DECL_EXTERNAL (decl
))
2188 /* Do nothing for global register variables. */
2189 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2191 TREE_ASM_WRITTEN (decl
) = 1;
2195 /* If type was incomplete when the variable was declared,
2196 see if it is complete now. */
2198 if (DECL_SIZE (decl
) == 0)
2199 layout_decl (decl
, 0);
2201 /* Still incomplete => don't allocate it; treat the tentative defn
2202 (which is what it must have been) as an `extern' reference. */
2204 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2206 error ("storage size of %q+D isn%'t known", decl
);
2207 TREE_ASM_WRITTEN (decl
) = 1;
2211 /* The first declaration of a variable that comes through this function
2212 decides whether it is global (in C, has external linkage)
2213 or local (in C, has internal linkage). So do nothing more
2214 if this function has already run. */
2216 if (TREE_ASM_WRITTEN (decl
))
2219 /* Make sure targetm.encode_section_info is invoked before we set
2221 decl_rtl
= DECL_RTL (decl
);
2223 TREE_ASM_WRITTEN (decl
) = 1;
2225 /* Do no output if -fsyntax-only. */
2226 if (flag_syntax_only
)
2229 if (! dont_output_data
2230 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2232 error ("size of variable %q+D is too large", decl
);
2236 gcc_assert (MEM_P (decl_rtl
));
2237 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2238 symbol
= XEXP (decl_rtl
, 0);
2240 /* If this symbol belongs to the tree constant pool, output the constant
2241 if it hasn't already been written. */
2242 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2244 tree decl
= SYMBOL_REF_DECL (symbol
);
2245 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2246 output_constant_def_contents (symbol
);
2252 name
= XSTR (symbol
, 0);
2253 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2254 notice_global_symbol (decl
);
2256 /* Compute the alignment of this data. */
2258 align_variable (decl
, dont_output_data
);
2260 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2261 && asan_protect_global (decl
))
2263 asan_protected
= true;
2264 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
2265 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
2268 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2270 align
= get_variable_align (decl
);
2272 if (TREE_PUBLIC (decl
))
2273 maybe_assemble_visibility (decl
);
2275 if (DECL_PRESERVE_P (decl
))
2276 targetm
.asm_out
.mark_decl_preserved (name
);
2278 /* First make the assembler name(s) global if appropriate. */
2279 sect
= get_variable_section (decl
, false);
2280 if (TREE_PUBLIC (decl
)
2281 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2282 globalize_decl (decl
);
2284 /* Output any data that we will need to use the address of. */
2285 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2286 output_addressed_constants (DECL_INITIAL (decl
));
2288 /* dbxout.c needs to know this. */
2289 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2290 DECL_IN_TEXT_SECTION (decl
) = 1;
2292 /* If the decl is part of an object_block, make sure that the decl
2293 has been positioned within its block, but do not write out its
2294 definition yet. output_object_blocks will do that later. */
2295 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2297 gcc_assert (!dont_output_data
);
2298 place_block_symbol (symbol
);
2300 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2301 assemble_noswitch_variable (decl
, name
, sect
, align
);
2304 /* Special-case handling of vtv comdat sections. */
2305 if (sect
->named
.name
2306 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2307 handle_vtv_comdat_section (sect
, decl
);
2309 switch_to_section (sect
);
2310 if (align
> BITS_PER_UNIT
)
2311 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2312 assemble_variable_contents (decl
, name
, dont_output_data
);
2315 unsigned HOST_WIDE_INT
int size
2316 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2317 assemble_zeros (asan_red_zone_size (size
));
2323 /* Given a function declaration (FN_DECL), this function assembles the
2324 function into the .preinit_array section. */
2327 assemble_vtv_preinit_initializer (tree fn_decl
)
2330 unsigned flags
= SECTION_WRITE
;
2331 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2333 flags
|= SECTION_NOTYPE
;
2334 sect
= get_section (".preinit_array", flags
, fn_decl
);
2335 switch_to_section (sect
);
2336 assemble_addr_to_section (symbol
, sect
);
2339 /* Return 1 if type TYPE contains any pointers. */
2342 contains_pointers_p (tree type
)
2344 switch (TREE_CODE (type
))
2347 case REFERENCE_TYPE
:
2348 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2349 so I'll play safe and return 1. */
2355 case QUAL_UNION_TYPE
:
2358 /* For a type that has fields, see if the fields have pointers. */
2359 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2360 if (TREE_CODE (fields
) == FIELD_DECL
2361 && contains_pointers_p (TREE_TYPE (fields
)))
2367 /* An array type contains pointers if its element type does. */
2368 return contains_pointers_p (TREE_TYPE (type
));
2375 /* We delay assemble_external processing until
2376 the compilation unit is finalized. This is the best we can do for
2377 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2378 it all the way to final. See PR 17982 for further discussion. */
2379 static GTY(()) tree pending_assemble_externals
;
2381 #ifdef ASM_OUTPUT_EXTERNAL
2382 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2383 As a result, assemble_external can be called after the list of externals
2384 is processed and the pointer set destroyed. */
2385 static bool pending_assemble_externals_processed
;
2387 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2388 TREE_LIST in assemble_external. */
2389 static hash_set
<tree
> *pending_assemble_externals_set
;
2391 /* True if DECL is a function decl for which no out-of-line copy exists.
2392 It is assumed that DECL's assembler name has been set. */
2395 incorporeal_function_p (tree decl
)
2397 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2401 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2402 && ALLOCA_FUNCTION_CODE_P (DECL_FUNCTION_CODE (decl
)))
2405 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2406 /* Atomic or sync builtins which have survived this far will be
2407 resolved externally and therefore are not incorporeal. */
2408 if (strncmp (name
, "__builtin_", 10) == 0)
2414 /* Actually do the tests to determine if this is necessary, and invoke
2415 ASM_OUTPUT_EXTERNAL. */
2417 assemble_external_real (tree decl
)
2419 rtx rtl
= DECL_RTL (decl
);
2421 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2422 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2423 && !incorporeal_function_p (decl
))
2425 /* Some systems do require some output. */
2426 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2427 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2433 process_pending_assemble_externals (void)
2435 #ifdef ASM_OUTPUT_EXTERNAL
2437 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2438 assemble_external_real (TREE_VALUE (list
));
2440 pending_assemble_externals
= 0;
2441 pending_assemble_externals_processed
= true;
2442 delete pending_assemble_externals_set
;
2446 /* This TREE_LIST contains any weak symbol declarations waiting
2448 static GTY(()) tree weak_decls
;
2450 /* Output something to declare an external symbol to the assembler,
2451 and qualifiers such as weakness. (Most assemblers don't need
2452 extern declaration, so we normally output nothing.) Do nothing if
2453 DECL is not external. */
2456 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2458 /* Make sure that the ASM_OUT_FILE is open.
2459 If it's not, we should not be calling this function. */
2460 gcc_assert (asm_out_file
);
2462 /* In a perfect world, the following condition would be true.
2463 Sadly, the Go front end emit assembly *from the front end*,
2464 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2466 /* This function should only be called if we are expanding, or have
2468 Ideally, only final.c would be calling this function, but it is
2469 not clear whether that would break things somehow. See PR 17982
2470 for further discussion. */
2471 gcc_assert (state
== EXPANSION
2472 || state
== FINISHED
);
2475 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2478 /* We want to output annotation for weak and external symbols at
2479 very last to check if they are references or not. */
2481 if (TARGET_SUPPORTS_WEAK
2483 /* TREE_STATIC is a weird and abused creature which is not
2484 generally the right test for whether an entity has been
2485 locally emitted, inlined or otherwise not-really-extern, but
2486 for declarations that can be weak, it happens to be
2488 && !TREE_STATIC (decl
)
2489 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2490 && value_member (decl
, weak_decls
) == NULL_TREE
)
2491 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2493 #ifdef ASM_OUTPUT_EXTERNAL
2494 if (pending_assemble_externals_processed
)
2496 assemble_external_real (decl
);
2500 if (! pending_assemble_externals_set
->add (decl
))
2501 pending_assemble_externals
= tree_cons (NULL
, decl
,
2502 pending_assemble_externals
);
2506 /* Similar, for calling a library function FUN. */
2509 assemble_external_libcall (rtx fun
)
2511 /* Declare library function name external when first used, if nec. */
2512 if (! SYMBOL_REF_USED (fun
))
2514 SYMBOL_REF_USED (fun
) = 1;
2515 targetm
.asm_out
.external_libcall (fun
);
2519 /* Assemble a label named NAME. */
2522 assemble_label (FILE *file
, const char *name
)
2524 ASM_OUTPUT_LABEL (file
, name
);
2527 /* Set the symbol_referenced flag for ID. */
2529 mark_referenced (tree id
)
2531 TREE_SYMBOL_REFERENCED (id
) = 1;
2534 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2536 mark_decl_referenced (tree decl
)
2538 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2540 /* Extern inline functions don't become needed when referenced.
2541 If we know a method will be emitted in other TU and no new
2542 functions can be marked reachable, just use the external
2544 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2545 if (!DECL_EXTERNAL (decl
)
2546 && !node
->definition
)
2547 node
->mark_force_output ();
2549 else if (VAR_P (decl
))
2551 varpool_node
*node
= varpool_node::get_create (decl
);
2552 /* C++ frontend use mark_decl_references to force COMDAT variables
2553 to be output that might appear dead otherwise. */
2554 node
->force_output
= true;
2556 /* else do nothing - we can get various sorts of CST nodes here,
2557 which do not need to be marked. */
2561 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2562 starts with a *, the rest of NAME is output verbatim. Otherwise
2563 NAME is transformed in a target-specific way (usually by the
2564 addition of an underscore). */
2567 assemble_name_raw (FILE *file
, const char *name
)
2570 fputs (&name
[1], file
);
2572 ASM_OUTPUT_LABELREF (file
, name
);
2575 /* Like assemble_name_raw, but should be used when NAME might refer to
2576 an entity that is also represented as a tree (like a function or
2577 variable). If NAME does refer to such an entity, that entity will
2578 be marked as referenced. */
2581 assemble_name (FILE *file
, const char *name
)
2583 const char *real_name
;
2586 real_name
= targetm
.strip_name_encoding (name
);
2588 id
= maybe_get_identifier (real_name
);
2593 mark_referenced (id
);
2594 ultimate_transparent_alias_target (&id
);
2596 name
= IDENTIFIER_POINTER (id
);
2597 gcc_assert (! TREE_CHAIN (id
));
2600 assemble_name_raw (file
, name
);
2603 /* Allocate SIZE bytes writable static space with a gensym name
2604 and return an RTX to refer to its address. */
2607 assemble_static_space (unsigned HOST_WIDE_INT size
)
2610 const char *namestring
;
2613 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2615 namestring
= ggc_strdup (name
);
2617 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2618 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2620 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2621 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2624 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2625 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2628 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2629 so that each uninitialized object starts on such a boundary. */
2630 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2631 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2632 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2633 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2634 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2635 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2642 /* Assemble the static constant template for function entry trampolines.
2643 This is done at most once per compilation.
2644 Returns an RTX for the address of the template. */
2646 static GTY(()) rtx initial_trampoline
;
2649 assemble_trampoline_template (void)
2656 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2658 if (initial_trampoline
)
2659 return initial_trampoline
;
2661 /* By default, put trampoline templates in read-only data section. */
2663 #ifdef TRAMPOLINE_SECTION
2664 switch_to_section (TRAMPOLINE_SECTION
);
2666 switch_to_section (readonly_data_section
);
2669 /* Write the assembler code to define one. */
2670 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2672 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2674 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2675 targetm
.asm_out
.trampoline_template (asm_out_file
);
2677 /* Record the rtl to refer to it. */
2678 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2679 name
= ggc_strdup (label
);
2680 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2681 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2683 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2684 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2685 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2687 return initial_trampoline
;
2690 /* A and B are either alignments or offsets. Return the minimum alignment
2691 that may be assumed after adding the two together. */
2693 static inline unsigned
2694 min_align (unsigned int a
, unsigned int b
)
2696 return least_bit_hwi (a
| b
);
2699 /* Return the assembler directive for creating a given kind of integer
2700 object. SIZE is the number of bytes in the object and ALIGNED_P
2701 indicates whether it is known to be aligned. Return NULL if the
2702 assembly dialect has no such directive.
2704 The returned string should be printed at the start of a new line and
2705 be followed immediately by the object's initial value. */
2708 integer_asm_op (int size
, int aligned_p
)
2710 struct asm_int_op
*ops
;
2713 ops
= &targetm
.asm_out
.aligned_op
;
2715 ops
= &targetm
.asm_out
.unaligned_op
;
2720 return targetm
.asm_out
.byte_op
;
2734 /* Use directive OP to assemble an integer object X. Print OP at the
2735 start of the line, followed immediately by the value of X. */
2738 assemble_integer_with_op (const char *op
, rtx x
)
2740 fputs (op
, asm_out_file
);
2741 output_addr_const (asm_out_file
, x
);
2742 fputc ('\n', asm_out_file
);
2745 /* The default implementation of the asm_out.integer target hook. */
2748 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2749 unsigned int size ATTRIBUTE_UNUSED
,
2750 int aligned_p ATTRIBUTE_UNUSED
)
2752 const char *op
= integer_asm_op (size
, aligned_p
);
2753 /* Avoid GAS bugs for large values. Specifically negative values whose
2754 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2755 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2757 return op
&& (assemble_integer_with_op (op
, x
), true);
2760 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2761 the alignment of the integer in bits. Return 1 if we were able to output
2762 the constant, otherwise 0. We must be able to output the constant,
2763 if FORCE is nonzero. */
2766 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2770 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2772 /* See if the target hook can handle this kind of object. */
2773 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2776 /* If the object is a multi-byte one, try splitting it up. Split
2777 it into words it if is multi-word, otherwise split it into bytes. */
2780 machine_mode omode
, imode
;
2781 unsigned int subalign
;
2782 unsigned int subsize
, i
;
2783 enum mode_class mclass
;
2785 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2786 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2787 if (GET_CODE (x
) == CONST_FIXED
)
2788 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2792 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0).require ();
2793 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0).require ();
2795 for (i
= 0; i
< size
; i
+= subsize
)
2797 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2798 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2804 /* If we've printed some of it, but not all of it, there's no going
2809 gcc_assert (!force
);
2814 /* Assemble the floating-point constant D into an object of size MODE. ALIGN
2815 is the alignment of the constant in bits. If REVERSE is true, D is output
2816 in reverse storage order. */
2819 assemble_real (REAL_VALUE_TYPE d
, scalar_float_mode mode
, unsigned int align
,
2822 long data
[4] = {0, 0, 0, 0};
2823 int bitsize
, nelts
, nunits
, units_per
;
2826 /* This is hairy. We have a quantity of known size. real_to_target
2827 will put it into an array of *host* longs, 32 bits per element
2828 (even if long is more than 32 bits). We need to determine the
2829 number of array elements that are occupied (nelts) and the number
2830 of *target* min-addressable units that will be occupied in the
2831 object file (nunits). We cannot assume that 32 divides the
2832 mode's bitsize (size * BITS_PER_UNIT) evenly.
2834 size * BITS_PER_UNIT is used here to make sure that padding bits
2835 (which might appear at either end of the value; real_to_target
2836 will include the padding bits in its output array) are included. */
2838 nunits
= GET_MODE_SIZE (mode
);
2839 bitsize
= nunits
* BITS_PER_UNIT
;
2840 nelts
= CEIL (bitsize
, 32);
2841 units_per
= 32 / BITS_PER_UNIT
;
2843 real_to_target (data
, &d
, mode
);
2845 /* Put out the first word with the specified alignment. */
2847 elt
= flip_storage_order (SImode
, gen_int_mode (data
[nelts
- 1], SImode
));
2849 elt
= GEN_INT (data
[0]);
2850 assemble_integer (elt
, MIN (nunits
, units_per
), align
, 1);
2851 nunits
-= units_per
;
2853 /* Subsequent words need only 32-bit alignment. */
2854 align
= min_align (align
, 32);
2856 for (int i
= 1; i
< nelts
; i
++)
2859 elt
= flip_storage_order (SImode
,
2860 gen_int_mode (data
[nelts
- 1 - i
], SImode
));
2862 elt
= GEN_INT (data
[i
]);
2863 assemble_integer (elt
, MIN (nunits
, units_per
), align
, 1);
2864 nunits
-= units_per
;
2868 /* Given an expression EXP with a constant value,
2869 reduce it to the sum of an assembler symbol and an integer.
2870 Store them both in the structure *VALUE.
2871 EXP must be reducible. */
2875 HOST_WIDE_INT offset
;
2879 decode_addr_const (tree exp
, struct addr_const
*value
)
2881 tree target
= TREE_OPERAND (exp
, 0);
2882 HOST_WIDE_INT offset
= 0;
2887 if (TREE_CODE (target
) == COMPONENT_REF
2888 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2890 offset
+= int_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. */
2897 offset
+= (TREE_INT_CST_LOW (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2898 * TREE_INT_CST_LOW (TREE_OPERAND (target
, 1)));
2899 target
= TREE_OPERAND (target
, 0);
2901 else if (TREE_CODE (target
) == MEM_REF
2902 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2904 offset
+= mem_ref_offset (target
).to_short_addr ();
2905 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2907 else if (TREE_CODE (target
) == INDIRECT_REF
2908 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2909 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2911 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2916 switch (TREE_CODE (target
))
2920 x
= DECL_RTL (target
);
2924 x
= gen_rtx_MEM (FUNCTION_MODE
,
2925 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2934 x
= output_constant_def (target
, 1);
2938 /* This deals with absolute addresses. */
2939 offset
+= tree_to_shwi (TREE_OPERAND (target
, 0));
2940 x
= gen_rtx_MEM (QImode
,
2941 gen_rtx_SYMBOL_REF (Pmode
, "origin of addresses"));
2948 gcc_assert (MEM_P (x
));
2952 value
->offset
= offset
;
2955 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2957 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2959 /* Constant pool accessor function. */
2961 hash_table
<tree_descriptor_hasher
> *
2962 constant_pool_htab (void)
2964 return const_desc_htab
;
2967 /* Compute a hash code for a constant expression. */
2970 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2976 const_hash_1 (const tree exp
)
2981 enum tree_code code
= TREE_CODE (exp
);
2983 /* Either set P and LEN to the address and len of something to hash and
2984 exit the switch or return a value. */
2989 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2990 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2994 return real_hash (TREE_REAL_CST_PTR (exp
));
2997 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
3000 p
= TREE_STRING_POINTER (exp
);
3001 len
= TREE_STRING_LENGTH (exp
);
3005 return (const_hash_1 (TREE_REALPART (exp
)) * 5
3006 + const_hash_1 (TREE_IMAGPART (exp
)));
3012 hi
= 7 + VECTOR_CST_NELTS (exp
);
3014 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
3015 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
3022 unsigned HOST_WIDE_INT idx
;
3025 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
3027 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
3029 hi
= hi
* 603 + const_hash_1 (value
);
3037 struct addr_const value
;
3039 decode_addr_const (exp
, &value
);
3040 switch (GET_CODE (value
.base
))
3043 /* Don't hash the address of the SYMBOL_REF;
3044 only use the offset and the symbol name. */
3046 p
= XSTR (value
.base
, 0);
3047 for (i
= 0; p
[i
] != 0; i
++)
3048 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3053 + CODE_LABEL_NUMBER (label_ref_label (value
.base
)) * 13);
3063 case POINTER_PLUS_EXPR
:
3065 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3066 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3069 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3072 /* A language specific constant. Just hash the code. */
3076 /* Compute hashing function. */
3078 for (i
= 0; i
< len
; i
++)
3079 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3084 /* Wrapper of compare_constant, for the htab interface. */
3086 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3087 constant_descriptor_tree
*c2
)
3089 if (c1
->hash
!= c2
->hash
)
3091 return compare_constant (c1
->value
, c2
->value
);
3094 /* Compare t1 and t2, and return 1 only if they are known to result in
3095 the same bit pattern on output. */
3098 compare_constant (const tree t1
, const tree t2
)
3100 enum tree_code typecode
;
3102 if (t1
== NULL_TREE
)
3103 return t2
== NULL_TREE
;
3104 if (t2
== NULL_TREE
)
3107 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3110 switch (TREE_CODE (t1
))
3113 /* Integer constants are the same only if the same width of type. */
3114 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3116 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3118 return tree_int_cst_equal (t1
, t2
);
3121 /* Real constants are the same only if the same width of type. In
3122 addition to the same width, we need to check whether the modes are the
3123 same. There might be two floating point modes that are the same size
3124 but have different representations, such as the PowerPC that has 2
3125 different 128-bit floating point types (IBM extended double and IEEE
3126 128-bit floating point). */
3127 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3129 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3131 return real_identical (&TREE_REAL_CST (t1
), &TREE_REAL_CST (t2
));
3134 /* Fixed constants are the same only if the same width of type. */
3135 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3138 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3141 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3144 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3145 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3146 TREE_STRING_LENGTH (t1
)));
3149 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3150 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3156 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3159 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3160 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3161 VECTOR_CST_ELT (t2
, i
)))
3169 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3170 unsigned HOST_WIDE_INT idx
;
3172 typecode
= TREE_CODE (TREE_TYPE (t1
));
3173 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3176 if (typecode
== ARRAY_TYPE
)
3178 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3179 /* For arrays, check that mode, size and storage order match. */
3180 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3182 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
))
3183 || TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t1
))
3184 != TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t2
)))
3189 /* For record and union constructors, require exact type
3191 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3195 v1
= CONSTRUCTOR_ELTS (t1
);
3196 v2
= CONSTRUCTOR_ELTS (t2
);
3197 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3200 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3202 constructor_elt
*c1
= &(*v1
)[idx
];
3203 constructor_elt
*c2
= &(*v2
)[idx
];
3205 /* Check that each value is the same... */
3206 if (!compare_constant (c1
->value
, c2
->value
))
3208 /* ... and that they apply to the same fields! */
3209 if (typecode
== ARRAY_TYPE
)
3211 if (!compare_constant (c1
->index
, c2
->index
))
3216 if (c1
->index
!= c2
->index
)
3227 struct addr_const value1
, value2
;
3231 decode_addr_const (t1
, &value1
);
3232 decode_addr_const (t2
, &value2
);
3234 if (value1
.offset
!= value2
.offset
)
3237 code
= GET_CODE (value1
.base
);
3238 if (code
!= GET_CODE (value2
.base
))
3244 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3248 ret
= (CODE_LABEL_NUMBER (label_ref_label (value1
.base
))
3249 == CODE_LABEL_NUMBER (label_ref_label (value2
.base
)));
3259 case POINTER_PLUS_EXPR
:
3262 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3263 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3266 case VIEW_CONVERT_EXPR
:
3267 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3276 /* Return the section into which constant EXP should be placed. */
3279 get_constant_section (tree exp
, unsigned int align
)
3281 return targetm
.asm_out
.select_section (exp
,
3282 compute_reloc_for_constant (exp
),
3286 /* Return the size of constant EXP in bytes. */
3288 static HOST_WIDE_INT
3289 get_constant_size (tree exp
)
3293 size
= int_size_in_bytes (TREE_TYPE (exp
));
3294 if (TREE_CODE (exp
) == STRING_CST
)
3295 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3299 /* Subroutine of output_constant_def:
3300 No constant equal to EXP is known to have been output.
3301 Make a constant descriptor to enter EXP in the hash table.
3302 Assign the label number and construct RTL to refer to the
3303 constant's location in memory.
3304 Caller is responsible for updating the hash table. */
3306 static struct constant_descriptor_tree
*
3307 build_constant_desc (tree exp
)
3309 struct constant_descriptor_tree
*desc
;
3315 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3318 /* Create a string containing the label name, in LABEL. */
3319 labelno
= const_labelno
++;
3320 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3322 /* Construct the VAR_DECL associated with the constant. */
3323 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3325 DECL_ARTIFICIAL (decl
) = 1;
3326 DECL_IGNORED_P (decl
) = 1;
3327 TREE_READONLY (decl
) = 1;
3328 TREE_STATIC (decl
) = 1;
3329 TREE_ADDRESSABLE (decl
) = 1;
3330 /* We don't set the RTL yet as this would cause varpool to assume that the
3331 variable is referenced. Moreover, it would just be dropped in LTO mode.
3332 Instead we set the flag that will be recognized in make_decl_rtl. */
3333 DECL_IN_CONSTANT_POOL (decl
) = 1;
3334 DECL_INITIAL (decl
) = desc
->value
;
3335 /* ??? targetm.constant_alignment hasn't been updated for vector types on
3336 most architectures so use DATA_ALIGNMENT as well, except for strings. */
3337 if (TREE_CODE (exp
) == STRING_CST
)
3338 SET_DECL_ALIGN (decl
, targetm
.constant_alignment (exp
, DECL_ALIGN (decl
)));
3340 align_variable (decl
, 0);
3342 /* Now construct the SYMBOL_REF and the MEM. */
3343 if (use_object_blocks_p ())
3345 int align
= (TREE_CODE (decl
) == CONST_DECL
3346 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3348 : symtab_node::get (decl
)->definition_alignment ());
3349 section
*sect
= get_constant_section (exp
, align
);
3350 symbol
= create_block_symbol (ggc_strdup (label
),
3351 get_block_for_section (sect
), -1);
3354 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3355 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3356 SET_SYMBOL_REF_DECL (symbol
, decl
);
3357 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3359 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3360 set_mem_attributes (rtl
, exp
, 1);
3361 set_mem_alias_set (rtl
, 0);
3363 /* Putting EXP into the literal pool might have imposed a different
3364 alignment which should be visible in the RTX as well. */
3365 set_mem_align (rtl
, DECL_ALIGN (decl
));
3367 /* We cannot share RTX'es in pool entries.
3368 Mark this piece of RTL as required for unsharing. */
3369 RTX_FLAG (rtl
, used
) = 1;
3371 /* Set flags or add text to the name to record information, such as
3372 that it is a local symbol. If the name is changed, the macro
3373 ASM_OUTPUT_LABELREF will have to know how to strip this
3374 information. This call might invalidate our local variable
3375 SYMBOL; we can't use it afterward. */
3376 targetm
.encode_section_info (exp
, rtl
, true);
3383 /* Return an rtx representing a reference to constant data in memory
3384 for the constant expression EXP.
3386 If assembler code for such a constant has already been output,
3387 return an rtx to refer to it.
3388 Otherwise, output such a constant in memory
3389 and generate an rtx for it.
3391 If DEFER is nonzero, this constant can be deferred and output only
3392 if referenced in the function after all optimizations.
3394 `const_desc_table' records which constants already have label strings. */
3397 output_constant_def (tree exp
, int defer
)
3399 struct constant_descriptor_tree
*desc
;
3400 struct constant_descriptor_tree key
;
3402 /* Look up EXP in the table of constant descriptors. If we didn't find
3403 it, create a new one. */
3405 key
.hash
= const_hash_1 (exp
);
3406 constant_descriptor_tree
**loc
3407 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3412 desc
= build_constant_desc (exp
);
3413 desc
->hash
= key
.hash
;
3417 maybe_output_constant_def_contents (desc
, defer
);
3421 /* Subroutine of output_constant_def: Decide whether or not we need to
3422 output the constant DESC now, and if so, do it. */
3424 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3427 rtx symbol
= XEXP (desc
->rtl
, 0);
3428 tree exp
= desc
->value
;
3430 if (flag_syntax_only
)
3433 if (TREE_ASM_WRITTEN (exp
))
3434 /* Already output; don't do it again. */
3437 /* We can always defer constants as long as the context allows
3441 /* Increment n_deferred_constants if it exists. It needs to be at
3442 least as large as the number of constants actually referred to
3443 by the function. If it's too small we'll stop looking too early
3444 and fail to emit constants; if it's too large we'll only look
3445 through the entire function when we could have stopped earlier. */
3447 n_deferred_constants
++;
3451 output_constant_def_contents (symbol
);
3454 /* Subroutine of output_constant_def_contents. Output the definition
3455 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3456 constant's alignment in bits. */
3459 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3463 size
= get_constant_size (exp
);
3465 /* Do any machine/system dependent processing of the constant. */
3466 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3468 /* Output the value of EXP. */
3469 output_constant (exp
, size
, align
, false);
3471 targetm
.asm_out
.decl_end ();
3474 /* We must output the constant data referred to by SYMBOL; do so. */
3477 output_constant_def_contents (rtx symbol
)
3479 tree decl
= SYMBOL_REF_DECL (symbol
);
3480 tree exp
= DECL_INITIAL (decl
);
3481 bool asan_protected
= false;
3483 /* Make sure any other constants whose addresses appear in EXP
3484 are assigned label numbers. */
3485 output_addressed_constants (exp
);
3487 /* We are no longer deferring this constant. */
3488 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3490 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3491 && TREE_CODE (exp
) == STRING_CST
3492 && asan_protect_global (exp
))
3494 asan_protected
= true;
3495 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
3496 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
3499 /* If the constant is part of an object block, make sure that the
3500 decl has been positioned within its block, but do not write out
3501 its definition yet. output_object_blocks will do that later. */
3502 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3503 place_block_symbol (symbol
);
3506 int align
= (TREE_CODE (decl
) == CONST_DECL
3507 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3509 : symtab_node::get (decl
)->definition_alignment ());
3510 switch_to_section (get_constant_section (exp
, align
));
3511 if (align
> BITS_PER_UNIT
)
3512 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3513 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3516 HOST_WIDE_INT size
= get_constant_size (exp
);
3517 assemble_zeros (asan_red_zone_size (size
));
3522 /* Look up EXP in the table of constant descriptors. Return the rtl
3523 if it has been emitted, else null. */
3526 lookup_constant_def (tree exp
)
3528 struct constant_descriptor_tree key
;
3531 key
.hash
= const_hash_1 (exp
);
3532 constant_descriptor_tree
*desc
3533 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3535 return (desc
? desc
->rtl
: NULL_RTX
);
3538 /* Return a tree representing a reference to constant data in memory
3539 for the constant expression EXP.
3541 This is the counterpart of output_constant_def at the Tree level. */
3544 tree_output_constant_def (tree exp
)
3546 struct constant_descriptor_tree
*desc
, key
;
3549 /* Look up EXP in the table of constant descriptors. If we didn't find
3550 it, create a new one. */
3552 key
.hash
= const_hash_1 (exp
);
3553 constant_descriptor_tree
**loc
3554 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3559 desc
= build_constant_desc (exp
);
3560 desc
->hash
= key
.hash
;
3564 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3565 varpool_node::finalize_decl (decl
);
3569 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3570 struct constant_descriptor_rtx
*next
;
3574 HOST_WIDE_INT offset
;
3576 fixed_size_mode mode
;
3582 struct const_rtx_desc_hasher
: ggc_ptr_hash
<constant_descriptor_rtx
>
3584 static hashval_t
hash (constant_descriptor_rtx
*);
3585 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3588 /* Used in the hash tables to avoid outputting the same constant
3589 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3590 are output once per function, not once per file. */
3591 /* ??? Only a few targets need per-function constant pools. Most
3592 can use one per-file pool. Should add a targetm bit to tell the
3595 struct GTY(()) rtx_constant_pool
{
3596 /* Pointers to first and last constant in pool, as ordered by offset. */
3597 struct constant_descriptor_rtx
*first
;
3598 struct constant_descriptor_rtx
*last
;
3600 /* Hash facility for making memory-constants from constant rtl-expressions.
3601 It is used on RISC machines where immediate integer arguments and
3602 constant addresses are restricted so that such constants must be stored
3604 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3606 /* Current offset in constant pool (does not include any
3607 machine-specific header). */
3608 HOST_WIDE_INT offset
;
3611 /* Hash and compare functions for const_rtx_htab. */
3614 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3620 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3621 constant_descriptor_rtx
*y
)
3623 if (x
->mode
!= y
->mode
)
3625 return rtx_equal_p (x
->constant
, y
->constant
);
3628 /* Hash one component of a constant. */
3631 const_rtx_hash_1 (const_rtx x
)
3633 unsigned HOST_WIDE_INT hwi
;
3639 code
= GET_CODE (x
);
3640 mode
= GET_MODE (x
);
3641 h
= (hashval_t
) code
* 1048573 + mode
;
3650 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3651 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3653 h
^= (hashval_t
) hwi
;
3654 for (i
= 1; i
< n
; ++i
)
3657 h
^= (hashval_t
) hwi
;
3662 case CONST_WIDE_INT
:
3665 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3666 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3671 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3673 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3677 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3681 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3685 h
^= htab_hash_string (XSTR (x
, 0));
3689 h
= h
* 251 + CODE_LABEL_NUMBER (label_ref_label (x
));
3693 case UNSPEC_VOLATILE
:
3694 h
= h
* 251 + XINT (x
, 1);
3704 /* Compute a hash value for X, which should be a constant. */
3707 const_rtx_hash (rtx x
)
3710 subrtx_iterator::array_type array
;
3711 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3712 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3717 /* Create and return a new rtx constant pool. */
3719 static struct rtx_constant_pool
*
3720 create_constant_pool (void)
3722 struct rtx_constant_pool
*pool
;
3724 pool
= ggc_alloc
<rtx_constant_pool
> ();
3725 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3732 /* Initialize constant pool hashing for a new function. */
3735 init_varasm_status (void)
3737 crtl
->varasm
.pool
= create_constant_pool ();
3738 crtl
->varasm
.deferred_constants
= 0;
3741 /* Given a MINUS expression, simplify it if both sides
3742 include the same symbol. */
3745 simplify_subtraction (rtx x
)
3747 rtx r
= simplify_rtx (x
);
3751 /* Given a constant rtx X, make (or find) a memory constant for its value
3752 and return a MEM rtx to refer to it in memory. IN_MODE is the mode
3756 force_const_mem (machine_mode in_mode
, rtx x
)
3758 struct constant_descriptor_rtx
*desc
, tmp
;
3759 struct rtx_constant_pool
*pool
;
3764 constant_descriptor_rtx
**slot
;
3765 fixed_size_mode mode
;
3767 /* We can't force variable-sized objects to memory. */
3768 if (!is_a
<fixed_size_mode
> (in_mode
, &mode
))
3771 /* If we're not allowed to drop X into the constant pool, don't. */
3772 if (targetm
.cannot_force_const_mem (mode
, x
))
3775 /* Record that this function has used a constant pool entry. */
3776 crtl
->uses_const_pool
= 1;
3778 /* Decide which pool to use. */
3779 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3780 ? shared_constant_pool
3781 : crtl
->varasm
.pool
);
3783 /* Lookup the value in the hashtable. */
3786 hash
= const_rtx_hash (x
);
3787 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3790 /* If the constant was already present, return its memory. */
3792 return copy_rtx (desc
->mem
);
3794 /* Otherwise, create a new descriptor. */
3795 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3798 /* Align the location counter as required by EXP's data type. */
3799 machine_mode align_mode
= (mode
== VOIDmode
? word_mode
: mode
);
3800 align
= targetm
.static_rtx_alignment (align_mode
);
3802 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3803 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3806 desc
->constant
= copy_rtx (tmp
.constant
);
3807 desc
->offset
= pool
->offset
;
3810 desc
->align
= align
;
3811 desc
->labelno
= const_labelno
;
3814 pool
->offset
+= GET_MODE_SIZE (mode
);
3816 pool
->last
->next
= desc
;
3818 pool
->first
= pool
->last
= desc
;
3821 /* Create a string containing the label name, in LABEL. */
3822 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3825 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3826 the constants pool. */
3827 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3829 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3830 symbol
= create_block_symbol (ggc_strdup (label
),
3831 get_block_for_section (sect
), -1);
3834 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3836 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3837 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3838 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3840 /* Construct the MEM. */
3841 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3842 set_mem_align (def
, align
);
3844 /* If we're dropping a label to the constant pool, make sure we
3846 if (GET_CODE (x
) == LABEL_REF
)
3847 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3849 return copy_rtx (def
);
3852 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3855 get_pool_constant (const_rtx addr
)
3857 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3860 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3861 and whether it has been output or not. */
3864 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3866 struct constant_descriptor_rtx
*desc
;
3868 desc
= SYMBOL_REF_CONSTANT (addr
);
3869 *pmarked
= (desc
->mark
!= 0);
3870 return desc
->constant
;
3873 /* Similar, return the mode. */
3876 get_pool_mode (const_rtx addr
)
3878 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3881 /* Return TRUE if and only if the constant pool has no entries. Note
3882 that even entries we might end up choosing not to emit are counted
3883 here, so there is the potential for missed optimizations. */
3886 constant_pool_empty_p (void)
3888 return crtl
->varasm
.pool
->first
== NULL
;
3891 /* Worker function for output_constant_pool_1. Emit assembly for X
3892 in MODE with known alignment ALIGN. */
3895 output_constant_pool_2 (fixed_size_mode mode
, rtx x
, unsigned int align
)
3897 switch (GET_MODE_CLASS (mode
))
3900 case MODE_DECIMAL_FLOAT
:
3902 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3903 assemble_real (*CONST_DOUBLE_REAL_VALUE (x
),
3904 as_a
<scalar_float_mode
> (mode
), align
, false);
3909 case MODE_PARTIAL_INT
:
3914 case MODE_POINTER_BOUNDS
:
3915 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3918 case MODE_VECTOR_FLOAT
:
3919 case MODE_VECTOR_INT
:
3920 case MODE_VECTOR_FRACT
:
3921 case MODE_VECTOR_UFRACT
:
3922 case MODE_VECTOR_ACCUM
:
3923 case MODE_VECTOR_UACCUM
:
3926 scalar_mode submode
= GET_MODE_INNER (mode
);
3927 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3929 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3930 units
= CONST_VECTOR_NUNITS (x
);
3932 for (i
= 0; i
< units
; i
++)
3934 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3935 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3945 /* Worker function for output_constant_pool. Emit constant DESC,
3946 giving it ALIGN bits of alignment. */
3949 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3956 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3957 whose CODE_LABEL has been deleted. This can occur if a jump table
3958 is eliminated by optimization. If so, write a constant of zero
3959 instead. Note that this can also happen by turning the
3960 CODE_LABEL into a NOTE. */
3961 /* ??? This seems completely and utterly wrong. Certainly it's
3962 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3963 functioning even with rtx_insn::deleted and friends. */
3966 switch (GET_CODE (tmp
))
3969 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3970 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3972 tmp
= XEXP (XEXP (tmp
, 0), 0);
3977 rtx_insn
*insn
= label_ref_label (tmp
);
3978 gcc_assert (!insn
->deleted ());
3979 gcc_assert (!NOTE_P (insn
)
3980 || NOTE_KIND (insn
) != NOTE_INSN_DELETED
);
3988 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3989 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3990 align
, desc
->labelno
, done
);
3993 assemble_align (align
);
3995 /* Output the label. */
3996 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3999 Pass actual alignment value while emitting string constant to asm code
4000 as function 'output_constant_pool_1' explicitly passes the alignment as 1
4001 assuming that the data is already aligned which prevents the generation
4002 of fix-up table entries. */
4003 output_constant_pool_2 (desc
->mode
, x
, desc
->align
);
4005 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
4006 sections have proper size. */
4007 if (align
> GET_MODE_BITSIZE (desc
->mode
)
4009 && (in_section
->common
.flags
& SECTION_MERGE
))
4010 assemble_align (align
);
4012 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
4018 /* Recompute the offsets of entries in POOL, and the overall size of
4019 POOL. Do this after calling mark_constant_pool to ensure that we
4020 are computing the offset values for the pool which we will actually
4024 recompute_pool_offsets (struct rtx_constant_pool
*pool
)
4026 struct constant_descriptor_rtx
*desc
;
4029 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4032 /* Recalculate offset. */
4033 unsigned int align
= desc
->align
;
4034 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
4035 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
4036 desc
->offset
= pool
->offset
;
4037 pool
->offset
+= GET_MODE_SIZE (desc
->mode
);
4041 /* Mark all constants that are referenced by SYMBOL_REFs in X.
4042 Emit referenced deferred strings. */
4045 mark_constants_in_pattern (rtx insn
)
4047 subrtx_iterator::array_type array
;
4048 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
4050 const_rtx x
= *iter
;
4051 if (GET_CODE (x
) == SYMBOL_REF
)
4053 if (CONSTANT_POOL_ADDRESS_P (x
))
4055 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
4056 if (desc
->mark
== 0)
4059 iter
.substitute (desc
->constant
);
4062 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
4064 tree decl
= SYMBOL_REF_DECL (x
);
4065 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
4067 n_deferred_constants
--;
4068 output_constant_def_contents (CONST_CAST_RTX (x
));
4075 /* Look through appropriate parts of INSN, marking all entries in the
4076 constant pool which are actually being used. Entries that are only
4077 referenced by other constants are also marked as used. Emit
4078 deferred strings that are used. */
4081 mark_constants (rtx_insn
*insn
)
4086 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4087 insns, not any notes that may be attached. We don't want to mark
4088 a constant just because it happens to appear in a REG_EQUIV note. */
4089 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4091 int i
, n
= seq
->len ();
4092 for (i
= 0; i
< n
; ++i
)
4094 rtx subinsn
= seq
->element (i
);
4095 if (INSN_P (subinsn
))
4096 mark_constants_in_pattern (subinsn
);
4100 mark_constants_in_pattern (insn
);
4103 /* Look through the instructions for this function, and mark all the
4104 entries in POOL which are actually being used. Emit deferred constants
4105 which have indeed been used. */
4108 mark_constant_pool (void)
4112 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4115 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4116 mark_constants (insn
);
4119 /* Write all the constants in POOL. */
4122 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4124 struct constant_descriptor_rtx
*desc
;
4126 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4129 /* If the constant is part of an object_block, make sure that
4130 the constant has been positioned within its block, but do not
4131 write out its definition yet. output_object_blocks will do
4133 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4134 && SYMBOL_REF_BLOCK (desc
->sym
))
4135 place_block_symbol (desc
->sym
);
4138 switch_to_section (targetm
.asm_out
.select_rtx_section
4139 (desc
->mode
, desc
->constant
, desc
->align
));
4140 output_constant_pool_1 (desc
, desc
->align
);
4145 /* Mark all constants that are used in the current function, then write
4146 out the function's private constant pool. */
4149 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4150 tree fndecl ATTRIBUTE_UNUSED
)
4152 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4154 /* It is possible for gcc to call force_const_mem and then to later
4155 discard the instructions which refer to the constant. In such a
4156 case we do not need to output the constant. */
4157 mark_constant_pool ();
4159 /* Having marked the constant pool entries we'll actually emit, we
4160 now need to rebuild the offset information, which may have become
4162 recompute_pool_offsets (pool
);
4164 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4165 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4168 output_constant_pool_contents (pool
);
4170 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4171 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4175 /* Write the contents of the shared constant pool. */
4178 output_shared_constant_pool (void)
4180 output_constant_pool_contents (shared_constant_pool
);
4183 /* Determine what kind of relocations EXP may need. */
4186 compute_reloc_for_constant (tree exp
)
4188 int reloc
= 0, reloc2
;
4191 switch (TREE_CODE (exp
))
4195 /* Go inside any operations that get_inner_reference can handle and see
4196 if what's inside is a constant: no need to do anything here for
4197 addresses of variables or functions. */
4198 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4199 tem
= TREE_OPERAND (tem
, 0))
4202 if (TREE_CODE (tem
) == MEM_REF
4203 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4205 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4209 if (!targetm
.binds_local_p (tem
))
4216 case POINTER_PLUS_EXPR
:
4217 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4218 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4222 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4223 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4224 /* The difference of two local labels is computable at link time. */
4225 if (reloc
== 1 && reloc2
== 1)
4232 case VIEW_CONVERT_EXPR
:
4233 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4238 unsigned HOST_WIDE_INT idx
;
4239 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4241 reloc
|= compute_reloc_for_constant (tem
);
4251 /* Find all the constants whose addresses are referenced inside of EXP,
4252 and make sure assembler code with a label has been output for each one.
4253 Indicate whether an ADDR_EXPR has been encountered. */
4256 output_addressed_constants (tree exp
)
4260 switch (TREE_CODE (exp
))
4264 /* Go inside any operations that get_inner_reference can handle and see
4265 if what's inside is a constant: no need to do anything here for
4266 addresses of variables or functions. */
4267 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4268 tem
= TREE_OPERAND (tem
, 0))
4271 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4272 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4273 tem
= DECL_INITIAL (tem
);
4275 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4276 output_constant_def (tem
, 0);
4278 if (TREE_CODE (tem
) == MEM_REF
)
4279 output_addressed_constants (TREE_OPERAND (tem
, 0));
4283 case POINTER_PLUS_EXPR
:
4285 output_addressed_constants (TREE_OPERAND (exp
, 1));
4289 case VIEW_CONVERT_EXPR
:
4290 output_addressed_constants (TREE_OPERAND (exp
, 0));
4295 unsigned HOST_WIDE_INT idx
;
4296 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4298 output_addressed_constants (tem
);
4307 /* Whether a constructor CTOR is a valid static constant initializer if all
4308 its elements are. This used to be internal to initializer_constant_valid_p
4309 and has been exposed to let other functions like categorize_ctor_elements
4310 evaluate the property while walking a constructor for other purposes. */
4313 constructor_static_from_elts_p (const_tree ctor
)
4315 return (TREE_CONSTANT (ctor
)
4316 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4317 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4318 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4321 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4324 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4325 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4326 which are valid when ENDTYPE is an integer of any size; in
4327 particular, this does not accept a pointer minus a constant. This
4328 returns null_pointer_node if the VALUE is an absolute constant
4329 which can be used to initialize a static variable. Otherwise it
4333 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4337 if (!INTEGRAL_TYPE_P (endtype
))
4340 op0
= TREE_OPERAND (value
, 0);
4341 op1
= TREE_OPERAND (value
, 1);
4343 /* Like STRIP_NOPS except allow the operand mode to widen. This
4344 works around a feature of fold that simplifies (int)(p1 - p2) to
4345 ((int)p1 - (int)p2) under the theory that the narrower operation
4348 while (CONVERT_EXPR_P (op0
)
4349 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4351 tree inner
= TREE_OPERAND (op0
, 0);
4352 if (inner
== error_mark_node
4353 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4354 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op0
)))
4355 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4360 while (CONVERT_EXPR_P (op1
)
4361 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4363 tree inner
= TREE_OPERAND (op1
, 0);
4364 if (inner
== error_mark_node
4365 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4366 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op1
)))
4367 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4372 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4376 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4377 cache
? cache
+ 2 : NULL
);
4378 /* Both initializers must be known. */
4382 && (op0
== null_pointer_node
4383 || TREE_CODE (value
) == MINUS_EXPR
))
4384 return null_pointer_node
;
4386 /* Support differences between labels. */
4387 if (TREE_CODE (op0
) == LABEL_DECL
4388 && TREE_CODE (op1
) == LABEL_DECL
)
4389 return null_pointer_node
;
4391 if (TREE_CODE (op0
) == STRING_CST
4392 && TREE_CODE (op1
) == STRING_CST
4393 && operand_equal_p (op0
, op1
, 1))
4394 return null_pointer_node
;
4400 /* Helper function of initializer_constant_valid_p.
4401 Return nonzero if VALUE is a valid constant-valued expression
4402 for use in initializing a static variable; one that can be an
4403 element of a "constant" initializer.
4405 Return null_pointer_node if the value is absolute;
4406 if it is relocatable, return the variable that determines the relocation.
4407 We assume that VALUE has been folded as much as possible;
4408 therefore, we do not need to check for such things as
4409 arithmetic-combinations of integers.
4411 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4414 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4418 switch (TREE_CODE (value
))
4421 if (constructor_static_from_elts_p (value
))
4423 unsigned HOST_WIDE_INT idx
;
4425 bool absolute
= true;
4427 if (cache
&& cache
[0] == value
)
4429 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4432 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4435 /* An absolute value is required with reverse SSO. */
4436 || (reloc
!= null_pointer_node
4437 && TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (value
))
4438 && !AGGREGATE_TYPE_P (TREE_TYPE (elt
))))
4443 cache
[1] = NULL_TREE
;
4447 if (reloc
!= null_pointer_node
)
4450 /* For a non-absolute relocation, there is no single
4451 variable that can be "the variable that determines the
4456 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4458 return absolute
? null_pointer_node
: error_mark_node
;
4461 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4469 return null_pointer_node
;
4474 tree op0
= staticp (TREE_OPERAND (value
, 0));
4477 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4478 to be a constant, this is old-skool offsetof-like nonsense. */
4479 if (TREE_CODE (op0
) == INDIRECT_REF
4480 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4481 return null_pointer_node
;
4482 /* Taking the address of a nested function involves a trampoline,
4483 unless we don't need or want one. */
4484 if (TREE_CODE (op0
) == FUNCTION_DECL
4485 && DECL_STATIC_CHAIN (op0
)
4486 && !TREE_NO_TRAMPOLINE (value
))
4488 /* "&{...}" requires a temporary to hold the constructed
4490 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4496 case NON_LVALUE_EXPR
:
4497 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4500 case VIEW_CONVERT_EXPR
:
4502 tree src
= TREE_OPERAND (value
, 0);
4503 tree src_type
= TREE_TYPE (src
);
4504 tree dest_type
= TREE_TYPE (value
);
4506 /* Allow view-conversions from aggregate to non-aggregate type only
4507 if the bit pattern is fully preserved afterwards; otherwise, the
4508 RTL expander won't be able to apply a subsequent transformation
4509 to the underlying constructor. */
4510 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4512 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4513 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4518 /* Allow all other kinds of view-conversion. */
4519 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4524 tree src
= TREE_OPERAND (value
, 0);
4525 tree src_type
= TREE_TYPE (src
);
4526 tree dest_type
= TREE_TYPE (value
);
4528 /* Allow conversions between pointer types, floating-point
4529 types, and offset types. */
4530 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4531 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4532 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4533 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4534 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4536 /* Allow length-preserving conversions between integer types. */
4537 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4538 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4539 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4541 /* Allow conversions between other integer types only if
4542 explicit value. Don't allow sign-extension to a type larger
4543 than word and pointer, there aren't relocations that would
4544 allow to sign extend it to a wider type. */
4545 if (INTEGRAL_TYPE_P (dest_type
)
4546 && INTEGRAL_TYPE_P (src_type
)
4547 && (TYPE_UNSIGNED (src_type
)
4548 || TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
)
4549 || TYPE_PRECISION (dest_type
) <= BITS_PER_WORD
4550 || TYPE_PRECISION (dest_type
) <= POINTER_SIZE
))
4552 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4553 if (inner
== null_pointer_node
)
4554 return null_pointer_node
;
4558 /* Allow (int) &foo provided int is as wide as a pointer. */
4559 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4560 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4561 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4563 /* Likewise conversions from int to pointers, but also allow
4564 conversions from 0. */
4565 if ((POINTER_TYPE_P (dest_type
)
4566 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4567 && INTEGRAL_TYPE_P (src_type
))
4569 if (TREE_CODE (src
) == INTEGER_CST
4570 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4571 return null_pointer_node
;
4572 if (integer_zerop (src
))
4573 return null_pointer_node
;
4574 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4575 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4578 /* Allow conversions to struct or union types if the value
4580 if (TREE_CODE (dest_type
) == RECORD_TYPE
4581 || TREE_CODE (dest_type
) == UNION_TYPE
)
4582 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4586 case POINTER_PLUS_EXPR
:
4588 /* Any valid floating-point constants will have been folded by now;
4589 with -frounding-math we hit this with addition of two constants. */
4590 if (TREE_CODE (endtype
) == REAL_TYPE
)
4592 if (cache
&& cache
[0] == value
)
4594 if (! INTEGRAL_TYPE_P (endtype
)
4595 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4597 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4599 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4602 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4603 endtype
, ncache
+ 2);
4604 /* If either term is absolute, use the other term's relocation. */
4605 if (valid0
== null_pointer_node
)
4607 else if (valid1
== null_pointer_node
)
4609 /* Support narrowing pointer differences. */
4611 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4615 /* Support narrowing pointer differences. */
4616 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4624 case POINTER_DIFF_EXPR
:
4626 if (TREE_CODE (endtype
) == REAL_TYPE
)
4628 if (cache
&& cache
[0] == value
)
4630 if (! INTEGRAL_TYPE_P (endtype
)
4631 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4633 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4635 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4638 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4639 endtype
, ncache
+ 2);
4640 /* Win if second argument is absolute. */
4641 if (valid1
== null_pointer_node
)
4643 /* Win if both arguments have the same relocation.
4644 Then the value is absolute. */
4645 else if (valid0
== valid1
&& valid0
!= 0)
4646 ret
= null_pointer_node
;
4647 /* Since GCC guarantees that string constants are unique in the
4648 generated code, a subtraction between two copies of the same
4649 constant string is absolute. */
4650 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4651 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4652 && operand_equal_p (valid0
, valid1
, 1))
4653 ret
= null_pointer_node
;
4654 /* Support narrowing differences. */
4656 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4660 /* Support narrowing differences. */
4661 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4676 /* Return nonzero if VALUE is a valid constant-valued expression
4677 for use in initializing a static variable; one that can be an
4678 element of a "constant" initializer.
4680 Return null_pointer_node if the value is absolute;
4681 if it is relocatable, return the variable that determines the relocation.
4682 We assume that VALUE has been folded as much as possible;
4683 therefore, we do not need to check for such things as
4684 arithmetic-combinations of integers. */
4686 initializer_constant_valid_p (tree value
, tree endtype
, bool reverse
)
4688 tree reloc
= initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4690 /* An absolute value is required with reverse storage order. */
4692 && reloc
!= null_pointer_node
4694 && !AGGREGATE_TYPE_P (endtype
)
4695 && !VECTOR_TYPE_P (endtype
))
4701 /* Return true if VALUE is a valid constant-valued expression
4702 for use in initializing a static bit-field; one that can be
4703 an element of a "constant" initializer. */
4706 initializer_constant_valid_for_bitfield_p (tree value
)
4708 /* For bitfields we support integer constants or possibly nested aggregates
4710 switch (TREE_CODE (value
))
4714 unsigned HOST_WIDE_INT idx
;
4717 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4718 if (!initializer_constant_valid_for_bitfield_p (elt
))
4727 case VIEW_CONVERT_EXPR
:
4728 case NON_LVALUE_EXPR
:
4730 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4739 /* output_constructor outer state of relevance in recursive calls, typically
4740 for nested aggregate bitfields. */
4742 struct oc_outer_state
{
4743 unsigned int bit_offset
; /* current position in ... */
4744 int byte
; /* ... the outer byte buffer. */
4747 static unsigned HOST_WIDE_INT
4748 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int, bool,
4751 /* Output assembler code for constant EXP, with no label.
4752 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4753 Assumes output_addressed_constants has been done on EXP already.
4755 Generate at least SIZE bytes of assembler data, padding at the end
4756 with zeros if necessary. SIZE must always be specified. The returned
4757 value is the actual number of bytes of assembler data generated, which
4758 may be bigger than SIZE if the object contains a variable length field.
4760 SIZE is important for structure constructors,
4761 since trailing members may have been omitted from the constructor.
4762 It is also important for initialization of arrays from string constants
4763 since the full length of the string constant might not be wanted.
4764 It is also needed for initialization of unions, where the initializer's
4765 type is just one member, and that may not be as long as the union.
4767 There a case in which we would fail to output exactly SIZE bytes:
4768 for a structure constructor that wants to produce more than SIZE bytes.
4769 But such constructors will never be generated for any possible input.
4771 ALIGN is the alignment of the data in bits.
4773 If REVERSE is true, EXP is output in reverse storage order. */
4775 static unsigned HOST_WIDE_INT
4776 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
4779 enum tree_code code
;
4780 unsigned HOST_WIDE_INT thissize
;
4783 if (size
== 0 || flag_syntax_only
)
4786 /* See if we're trying to initialize a pointer in a non-default mode
4787 to the address of some declaration somewhere. If the target says
4788 the mode is valid for pointers, assume the target has a way of
4790 if (TREE_CODE (exp
) == NOP_EXPR
4791 && POINTER_TYPE_P (TREE_TYPE (exp
))
4792 && targetm
.addr_space
.valid_pointer_mode
4793 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
4794 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4796 tree saved_type
= TREE_TYPE (exp
);
4798 /* Peel off any intermediate conversions-to-pointer for valid
4800 while (TREE_CODE (exp
) == NOP_EXPR
4801 && POINTER_TYPE_P (TREE_TYPE (exp
))
4802 && targetm
.addr_space
.valid_pointer_mode
4803 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
4804 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4805 exp
= TREE_OPERAND (exp
, 0);
4807 /* If what we're left with is the address of something, we can
4808 convert the address to the final type and output it that
4810 if (TREE_CODE (exp
) == ADDR_EXPR
)
4811 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4812 /* Likewise for constant ints. */
4813 else if (TREE_CODE (exp
) == INTEGER_CST
)
4814 exp
= fold_convert (saved_type
, exp
);
4818 /* Eliminate any conversions since we'll be outputting the underlying
4820 while (CONVERT_EXPR_P (exp
)
4821 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4822 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4824 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4825 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4827 /* Make sure eliminating the conversion is really a no-op, except with
4828 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4829 union types to allow for Ada unchecked unions. */
4830 if (type_size
> op_size
4831 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4832 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4833 /* Keep the conversion. */
4836 exp
= TREE_OPERAND (exp
, 0);
4839 code
= TREE_CODE (TREE_TYPE (exp
));
4840 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4842 /* Allow a constructor with no elements for any data type.
4843 This means to fill the space with zeros. */
4844 if (TREE_CODE (exp
) == CONSTRUCTOR
4845 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4847 assemble_zeros (size
);
4851 if (TREE_CODE (exp
) == FDESC_EXPR
)
4853 #ifdef ASM_OUTPUT_FDESC
4854 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4855 tree decl
= TREE_OPERAND (exp
, 0);
4856 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4863 /* Now output the underlying data. If we've handling the padding, return.
4864 Otherwise, break and ensure SIZE is the size written. */
4871 case REFERENCE_TYPE
:
4873 case FIXED_POINT_TYPE
:
4874 case POINTER_BOUNDS_TYPE
:
4876 cst
= expand_expr (exp
, NULL_RTX
, VOIDmode
, EXPAND_INITIALIZER
);
4878 cst
= flip_storage_order (TYPE_MODE (TREE_TYPE (exp
)), cst
);
4879 if (!assemble_integer (cst
, MIN (size
, thissize
), align
, 0))
4880 error ("initializer for integer/fixed-point value is too complicated");
4884 if (TREE_CODE (exp
) != REAL_CST
)
4885 error ("initializer for floating value is not a floating constant");
4887 assemble_real (TREE_REAL_CST (exp
),
4888 SCALAR_FLOAT_TYPE_MODE (TREE_TYPE (exp
)),
4893 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
, reverse
);
4894 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4895 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)),
4901 switch (TREE_CODE (exp
))
4904 return output_constructor (exp
, size
, align
, reverse
, NULL
);
4907 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4908 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4912 scalar_mode inner
= SCALAR_TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4913 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4914 int elt_size
= GET_MODE_SIZE (inner
);
4915 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
,
4917 thissize
= elt_size
;
4918 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4920 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
,
4922 thissize
+= elt_size
;
4933 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4934 return output_constructor (exp
, size
, align
, reverse
, NULL
);
4943 if (size
> thissize
)
4944 assemble_zeros (size
- thissize
);
4949 /* Subroutine of output_constructor, used for computing the size of
4950 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4951 type with an unspecified upper bound. */
4953 static unsigned HOST_WIDE_INT
4954 array_size_for_constructor (tree val
)
4957 unsigned HOST_WIDE_INT cnt
;
4958 tree index
, value
, tmp
;
4961 /* This code used to attempt to handle string constants that are not
4962 arrays of single-bytes, but nothing else does, so there's no point in
4964 if (TREE_CODE (val
) == STRING_CST
)
4965 return TREE_STRING_LENGTH (val
);
4967 max_index
= NULL_TREE
;
4968 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4970 if (TREE_CODE (index
) == RANGE_EXPR
)
4971 index
= TREE_OPERAND (index
, 1);
4972 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4976 if (max_index
== NULL_TREE
)
4979 /* Compute the total number of array elements. */
4980 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4981 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4983 /* Multiply by the array element unit size to find number of bytes. */
4984 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4986 gcc_assert (wi::fits_uhwi_p (i
));
4987 return i
.to_uhwi ();
4990 /* Other datastructures + helpers for output_constructor. */
4992 /* output_constructor local state to support interaction with helpers. */
4994 struct oc_local_state
{
4996 /* Received arguments. */
4997 tree exp
; /* Constructor expression. */
4998 tree type
; /* Type of constructor expression. */
4999 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
5000 unsigned int align
; /* Known initial alignment. */
5001 tree min_index
; /* Lower bound if specified for an array. */
5003 /* Output processing state. */
5004 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
5005 int byte
; /* Part of a bitfield byte yet to be output. */
5006 int last_relative_index
; /* Implicit or explicit index of the last
5007 array element output within a bitfield. */
5008 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
5009 bool reverse
; /* Whether reverse storage order is in use. */
5011 /* Current element. */
5012 tree field
; /* Current field decl in a record. */
5013 tree val
; /* Current element value. */
5014 tree index
; /* Current element index. */
5018 /* Helper for output_constructor. From the current LOCAL state, output a
5019 RANGE_EXPR element. */
5022 output_constructor_array_range (oc_local_state
*local
)
5024 unsigned HOST_WIDE_INT fieldsize
5025 = int_size_in_bytes (TREE_TYPE (local
->type
));
5027 HOST_WIDE_INT lo_index
5028 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
5029 HOST_WIDE_INT hi_index
5030 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
5031 HOST_WIDE_INT index
;
5034 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
5036 for (index
= lo_index
; index
<= hi_index
; index
++)
5038 /* Output the element's initial value. */
5039 if (local
->val
== NULL_TREE
)
5040 assemble_zeros (fieldsize
);
5043 = output_constant (local
->val
, fieldsize
, align2
, local
->reverse
);
5045 /* Count its size. */
5046 local
->total_bytes
+= fieldsize
;
5050 /* Helper for output_constructor. From the current LOCAL state, output a
5051 field element that is not true bitfield or part of an outer one. */
5054 output_constructor_regular_field (oc_local_state
*local
)
5056 /* Field size and position. Since this structure is static, we know the
5057 positions are constant. */
5058 unsigned HOST_WIDE_INT fieldsize
;
5059 HOST_WIDE_INT fieldpos
;
5061 unsigned int align2
;
5063 /* Output any buffered-up bit-fields preceding this element. */
5064 if (local
->byte_buffer_in_use
)
5066 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5067 local
->total_bytes
++;
5068 local
->byte_buffer_in_use
= false;
5071 if (local
->index
!= NULL_TREE
)
5073 /* Perform the index calculation in modulo arithmetic but
5074 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
5075 but we are using an unsigned sizetype. */
5076 unsigned prec
= TYPE_PRECISION (sizetype
);
5077 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
5078 - wi::to_offset (local
->min_index
), prec
);
5079 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
5082 else if (local
->field
!= NULL_TREE
)
5083 fieldpos
= int_byte_position (local
->field
);
5087 /* Advance to offset of this element.
5088 Note no alignment needed in an array, since that is guaranteed
5089 if each element has the proper size. */
5090 if (local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
5092 if (fieldpos
> local
->total_bytes
)
5094 assemble_zeros (fieldpos
- local
->total_bytes
);
5095 local
->total_bytes
= fieldpos
;
5098 /* Must not go backwards. */
5099 gcc_assert (fieldpos
== local
->total_bytes
);
5102 /* Find the alignment of this element. */
5103 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
5105 /* Determine size this element should occupy. */
5110 /* If this is an array with an unspecified upper bound,
5111 the initializer determines the size. */
5112 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5113 but we cannot do this until the deprecated support for
5114 initializing zero-length array members is removed. */
5115 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
5116 && (!TYPE_DOMAIN (TREE_TYPE (local
->field
))
5117 || !TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
)))))
5119 fieldsize
= array_size_for_constructor (local
->val
);
5120 /* Given a non-empty initialization, this field had better
5121 be last. Given a flexible array member, the next field
5122 on the chain is a TYPE_DECL of the enclosing struct. */
5123 const_tree next
= DECL_CHAIN (local
->field
);
5124 gcc_assert (!fieldsize
|| !next
|| TREE_CODE (next
) != FIELD_DECL
);
5127 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5130 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5132 /* Output the element's initial value. */
5133 if (local
->val
== NULL_TREE
)
5134 assemble_zeros (fieldsize
);
5137 = output_constant (local
->val
, fieldsize
, align2
, local
->reverse
);
5139 /* Count its size. */
5140 local
->total_bytes
+= fieldsize
;
5143 /* Helper for output_constructor. From the LOCAL state, output an element
5144 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5145 from the start of a possibly ongoing outer byte buffer. */
5148 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5150 /* Bit size of this element. */
5151 HOST_WIDE_INT ebitsize
5153 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5154 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5156 /* Relative index of this element if this is an array component. */
5157 HOST_WIDE_INT relative_index
5160 ? (tree_to_shwi (local
->index
)
5161 - tree_to_shwi (local
->min_index
))
5162 : local
->last_relative_index
+ 1)
5165 /* Bit position of this element from the start of the containing
5167 HOST_WIDE_INT constructor_relative_ebitpos
5169 ? int_bit_position (local
->field
)
5170 : ebitsize
* relative_index
);
5172 /* Bit position of this element from the start of a possibly ongoing
5173 outer byte buffer. */
5174 HOST_WIDE_INT byte_relative_ebitpos
5175 = bit_offset
+ constructor_relative_ebitpos
;
5177 /* From the start of a possibly ongoing outer byte buffer, offsets to
5178 the first bit of this element and to the first bit past the end of
5180 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5181 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5183 local
->last_relative_index
= relative_index
;
5185 if (local
->val
== NULL_TREE
)
5186 local
->val
= integer_zero_node
;
5188 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5189 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5190 local
->val
= TREE_OPERAND (local
->val
, 0);
5192 if (TREE_CODE (local
->val
) != INTEGER_CST
5193 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5195 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5199 /* If this field does not start in this (or next) byte, skip some bytes. */
5200 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5202 /* Output remnant of any bit field in previous bytes. */
5203 if (local
->byte_buffer_in_use
)
5205 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5206 local
->total_bytes
++;
5207 local
->byte_buffer_in_use
= false;
5210 /* If still not at proper byte, advance to there. */
5211 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5213 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5214 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5215 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5219 /* Set up the buffer if necessary. */
5220 if (!local
->byte_buffer_in_use
)
5224 local
->byte_buffer_in_use
= true;
5227 /* If this is nested constructor, recurse passing the bit offset and the
5228 pending data, then retrieve the new pending data afterwards. */
5229 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5231 oc_outer_state temp_state
;
5232 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5233 temp_state
.byte
= local
->byte
;
5235 += output_constructor (local
->val
, 0, 0, local
->reverse
, &temp_state
);
5236 local
->byte
= temp_state
.byte
;
5240 /* Otherwise, we must split the element into pieces that fall within
5241 separate bytes, and combine each byte with previous or following
5243 while (next_offset
< end_offset
)
5247 HOST_WIDE_INT value
;
5248 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5249 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5251 /* Advance from byte to byte within this element when necessary. */
5252 while (next_byte
!= local
->total_bytes
)
5254 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5255 local
->total_bytes
++;
5259 /* Number of bits we can process at once (all part of the same byte). */
5260 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5261 if (local
->reverse
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
5263 /* For big-endian data, take the most significant bits (of the
5264 bits that are significant) first and put them into bytes from
5265 the most significant end. */
5266 shift
= end_offset
- next_offset
- this_time
;
5268 /* Don't try to take a bunch of bits that cross
5269 the word boundary in the INTEGER_CST. We can
5270 only select bits from one element. */
5271 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5272 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5274 const int end
= shift
+ this_time
- 1;
5275 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5276 this_time
= end
- shift
+ 1;
5279 /* Now get the bits from the appropriate constant word. */
5280 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5281 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5283 /* Get the result. This works only when:
5284 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5285 local
->byte
|= (((value
>> shift
)
5286 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5287 << (BITS_PER_UNIT
- this_time
- next_bit
));
5291 /* On little-endian machines, take the least significant bits of
5292 the value first and pack them starting at the least significant
5293 bits of the bytes. */
5294 shift
= next_offset
- byte_relative_ebitpos
;
5296 /* Don't try to take a bunch of bits that cross
5297 the word boundary in the INTEGER_CST. We can
5298 only select bits from one element. */
5299 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5300 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5302 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5304 /* Now get the bits from the appropriate constant word. */
5305 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5306 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5308 /* Get the result. This works only when:
5309 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5310 local
->byte
|= (((value
>> shift
)
5311 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5315 next_offset
+= this_time
;
5316 local
->byte_buffer_in_use
= true;
5320 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5321 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5322 caller output state of relevance in recursive invocations. */
5324 static unsigned HOST_WIDE_INT
5325 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
5326 bool reverse
, oc_outer_state
*outer
)
5328 unsigned HOST_WIDE_INT cnt
;
5329 constructor_elt
*ce
;
5330 oc_local_state local
;
5332 /* Setup our local state to communicate with helpers. */
5334 local
.type
= TREE_TYPE (exp
);
5336 local
.align
= align
;
5337 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5338 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5340 local
.min_index
= integer_zero_node
;
5342 local
.total_bytes
= 0;
5343 local
.byte_buffer_in_use
= outer
!= NULL
;
5344 local
.byte
= outer
? outer
->byte
: 0;
5345 local
.last_relative_index
= -1;
5346 /* The storage order is specified for every aggregate type. */
5347 if (AGGREGATE_TYPE_P (local
.type
))
5348 local
.reverse
= TYPE_REVERSE_STORAGE_ORDER (local
.type
);
5350 local
.reverse
= reverse
;
5352 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5354 /* As CE goes through the elements of the constant, FIELD goes through the
5355 structure fields if the constant is a structure. If the constant is a
5356 union, we override this by getting the field from the TREE_LIST element.
5357 But the constant could also be an array. Then FIELD is zero.
5359 There is always a maximum of one element in the chain LINK for unions
5360 (even if the initializer in a source program incorrectly contains
5363 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5364 local
.field
= TYPE_FIELDS (local
.type
);
5366 local
.field
= NULL_TREE
;
5369 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5370 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5372 local
.val
= ce
->value
;
5373 local
.index
= NULL_TREE
;
5375 /* The element in a union constructor specifies the proper field
5377 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5378 local
.field
= ce
->index
;
5380 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5381 local
.index
= ce
->index
;
5383 if (local
.field
&& flag_verbose_asm
)
5384 fprintf (asm_out_file
, "%s %s:\n",
5386 DECL_NAME (local
.field
)
5387 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5390 /* Eliminate the marker that makes a cast not be an lvalue. */
5391 if (local
.val
!= NULL_TREE
)
5392 STRIP_NOPS (local
.val
);
5394 /* Output the current element, using the appropriate helper ... */
5396 /* For an array slice not part of an outer bitfield. */
5398 && local
.index
!= NULL_TREE
5399 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5400 output_constructor_array_range (&local
);
5402 /* For a field that is neither a true bitfield nor part of an outer one,
5403 known to be at least byte aligned and multiple-of-bytes long. */
5405 && (local
.field
== NULL_TREE
5406 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5407 output_constructor_regular_field (&local
);
5409 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5410 supported for scalar fields, so we may need to convert first. */
5413 if (TREE_CODE (local
.val
) == REAL_CST
)
5415 = fold_unary (VIEW_CONVERT_EXPR
,
5416 build_nonstandard_integer_type
5417 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5419 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5423 /* If we are not at toplevel, save the pending data for our caller.
5424 Otherwise output the pending data and padding zeros as needed. */
5426 outer
->byte
= local
.byte
;
5429 if (local
.byte_buffer_in_use
)
5431 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5432 local
.total_bytes
++;
5435 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5437 assemble_zeros (local
.size
- local
.total_bytes
);
5438 local
.total_bytes
= local
.size
;
5442 return local
.total_bytes
;
5445 /* Mark DECL as weak. */
5448 mark_weak (tree decl
)
5450 if (DECL_WEAK (decl
))
5453 struct symtab_node
*n
= symtab_node::get (decl
);
5454 if (n
&& n
->refuse_visibility_changes
)
5455 error ("%+qD declared weak after being used", decl
);
5456 DECL_WEAK (decl
) = 1;
5458 if (DECL_RTL_SET_P (decl
)
5459 && MEM_P (DECL_RTL (decl
))
5460 && XEXP (DECL_RTL (decl
), 0)
5461 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5462 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5465 /* Merge weak status between NEWDECL and OLDDECL. */
5468 merge_weak (tree newdecl
, tree olddecl
)
5470 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5472 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5475 /* We put the NEWDECL on the weak_decls list at some point
5476 and OLDDECL as well. Keep just OLDDECL on the list. */
5477 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5478 if (TREE_VALUE (*pwd
) == newdecl
)
5480 *pwd
= TREE_CHAIN (*pwd
);
5487 if (DECL_WEAK (newdecl
))
5491 /* NEWDECL is weak, but OLDDECL is not. */
5493 /* If we already output the OLDDECL, we're in trouble; we can't
5494 go back and make it weak. This should never happen in
5495 unit-at-a-time compilation. */
5496 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5498 /* If we've already generated rtl referencing OLDDECL, we may
5499 have done so in a way that will not function properly with
5500 a weak symbol. Again in unit-at-a-time this should be
5502 gcc_assert (!TREE_USED (olddecl
)
5503 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5505 /* PR 49899: You cannot convert a static function into a weak, public function. */
5506 if (! TREE_PUBLIC (olddecl
) && TREE_PUBLIC (newdecl
))
5507 error ("weak declaration of %q+D being applied to a already "
5508 "existing, static definition", newdecl
);
5510 if (TARGET_SUPPORTS_WEAK
)
5512 /* We put the NEWDECL on the weak_decls list at some point.
5513 Replace it with the OLDDECL. */
5514 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5515 if (TREE_VALUE (wd
) == newdecl
)
5517 TREE_VALUE (wd
) = olddecl
;
5520 /* We may not find the entry on the list. If NEWDECL is a
5521 weak alias, then we will have already called
5522 globalize_decl to remove the entry; in that case, we do
5523 not need to do anything. */
5526 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5527 mark_weak (olddecl
);
5530 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5531 weak. Just update NEWDECL to indicate that it's weak too. */
5532 mark_weak (newdecl
);
5535 /* Declare DECL to be a weak symbol. */
5538 declare_weak (tree decl
)
5540 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5541 if (! TREE_PUBLIC (decl
))
5543 error ("weak declaration of %q+D must be public", decl
);
5546 else if (!TARGET_SUPPORTS_WEAK
)
5547 warning (0, "weak declaration of %q+D not supported", decl
);
5550 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5551 DECL_ATTRIBUTES (decl
)
5552 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5556 weak_finish_1 (tree decl
)
5558 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5559 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5562 if (! TREE_USED (decl
))
5565 #ifdef ASM_WEAKEN_DECL
5566 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5568 #ifdef ASM_WEAKEN_LABEL
5569 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5571 #ifdef ASM_OUTPUT_WEAK_ALIAS
5573 static bool warn_once
= 0;
5576 warning (0, "only weak aliases are supported in this configuration");
5586 /* Fiven an assembly name, find the decl it is associated with. */
5588 find_decl (tree target
)
5590 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5596 /* This TREE_LIST contains weakref targets. */
5598 static GTY(()) tree weakref_targets
;
5600 /* Emit any pending weak declarations. */
5607 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5609 tree alias_decl
= TREE_PURPOSE (t
);
5610 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5612 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5613 /* Remove alias_decl from the weak list, but leave entries for
5614 the target alone. */
5616 #ifndef ASM_OUTPUT_WEAKREF
5617 else if (! TREE_SYMBOL_REFERENCED (target
))
5619 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5620 defined, otherwise we and weak_finish_1 would use
5621 different macros. */
5622 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5623 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5625 tree decl
= find_decl (target
);
5629 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5630 TREE_CODE (alias_decl
), target
,
5631 TREE_TYPE (alias_decl
));
5633 DECL_EXTERNAL (decl
) = 1;
5634 TREE_PUBLIC (decl
) = 1;
5635 DECL_ARTIFICIAL (decl
) = 1;
5636 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5637 TREE_USED (decl
) = 1;
5640 weak_finish_1 (decl
);
5649 /* Remove the alias and the target from the pending weak list
5650 so that we do not emit any .weak directives for the former,
5651 nor multiple .weak directives for the latter. */
5652 for (p
= &weak_decls
; (t2
= *p
) ; )
5654 if (TREE_VALUE (t2
) == alias_decl
5655 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5656 *p
= TREE_CHAIN (t2
);
5658 p
= &TREE_CHAIN (t2
);
5661 /* Remove other weakrefs to the same target, to speed things up. */
5662 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5664 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5665 *p
= TREE_CHAIN (t2
);
5667 p
= &TREE_CHAIN (t2
);
5672 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5674 tree decl
= TREE_VALUE (t
);
5676 weak_finish_1 (decl
);
5680 /* Emit the assembly bits to indicate that DECL is globally visible. */
5683 globalize_decl (tree decl
)
5686 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5687 if (DECL_WEAK (decl
))
5689 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5692 #ifdef ASM_WEAKEN_DECL
5693 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5695 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5698 /* Remove this function from the pending weak list so that
5699 we do not emit multiple .weak directives for it. */
5700 for (p
= &weak_decls
; (t
= *p
) ; )
5702 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5703 *p
= TREE_CHAIN (t
);
5705 p
= &TREE_CHAIN (t
);
5708 /* Remove weakrefs to the same target from the pending weakref
5709 list, for the same reason. */
5710 for (p
= &weakref_targets
; (t
= *p
) ; )
5712 if (DECL_ASSEMBLER_NAME (decl
)
5713 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5714 *p
= TREE_CHAIN (t
);
5716 p
= &TREE_CHAIN (t
);
5723 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5726 vec
<alias_pair
, va_gc
> *alias_pairs
;
5728 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5729 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5730 tree node is DECL to have the value of the tree node TARGET. */
5733 do_assemble_alias (tree decl
, tree target
)
5737 /* Emulated TLS had better not get this var. */
5738 gcc_assert (!(!targetm
.have_tls
5740 && DECL_THREAD_LOCAL_P (decl
)));
5742 if (TREE_ASM_WRITTEN (decl
))
5745 id
= DECL_ASSEMBLER_NAME (decl
);
5746 ultimate_transparent_alias_target (&id
);
5747 ultimate_transparent_alias_target (&target
);
5749 /* We must force creation of DECL_RTL for debug info generation, even though
5750 we don't use it here. */
5751 make_decl_rtl (decl
);
5753 TREE_ASM_WRITTEN (decl
) = 1;
5754 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5755 TREE_ASM_WRITTEN (id
) = 1;
5757 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5759 if (!TREE_SYMBOL_REFERENCED (target
))
5760 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5762 #ifdef ASM_OUTPUT_WEAKREF
5763 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5764 IDENTIFIER_POINTER (id
),
5765 IDENTIFIER_POINTER (target
));
5767 if (!TARGET_SUPPORTS_WEAK
)
5769 error_at (DECL_SOURCE_LOCATION (decl
),
5770 "weakref is not supported in this configuration");
5777 #ifdef ASM_OUTPUT_DEF
5778 tree orig_decl
= decl
;
5780 if (TREE_CODE (decl
) == FUNCTION_DECL
5781 && cgraph_node::get (decl
)->instrumentation_clone
5782 && cgraph_node::get (decl
)->instrumented_version
)
5783 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5785 /* Make name accessible from other files, if appropriate. */
5787 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5789 globalize_decl (decl
);
5790 maybe_assemble_visibility (decl
);
5792 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5794 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5795 if (targetm
.has_ifunc_p ())
5796 ASM_OUTPUT_TYPE_DIRECTIVE
5797 (asm_out_file
, IDENTIFIER_POINTER (id
),
5801 error_at (DECL_SOURCE_LOCATION (decl
),
5802 "ifunc is not supported on this target");
5805 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5806 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5808 ASM_OUTPUT_DEF (asm_out_file
,
5809 IDENTIFIER_POINTER (id
),
5810 IDENTIFIER_POINTER (target
));
5812 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5817 name
= IDENTIFIER_POINTER (id
);
5818 # ifdef ASM_WEAKEN_DECL
5819 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5821 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5823 /* Remove this function from the pending weak list so that
5824 we do not emit multiple .weak directives for it. */
5825 for (p
= &weak_decls
; (t
= *p
) ; )
5826 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5827 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5828 *p
= TREE_CHAIN (t
);
5830 p
= &TREE_CHAIN (t
);
5832 /* Remove weakrefs to the same target from the pending weakref
5833 list, for the same reason. */
5834 for (p
= &weakref_targets
; (t
= *p
) ; )
5836 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5837 *p
= TREE_CHAIN (t
);
5839 p
= &TREE_CHAIN (t
);
5845 /* Emit an assembler directive to make the symbol for DECL an alias to
5846 the symbol for TARGET. */
5849 assemble_alias (tree decl
, tree target
)
5853 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5855 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5857 ultimate_transparent_alias_target (&target
);
5859 if (alias
== target
)
5860 error ("weakref %q+D ultimately targets itself", decl
);
5861 if (TREE_PUBLIC (decl
))
5862 error ("weakref %q+D must have static linkage", decl
);
5866 #if !defined (ASM_OUTPUT_DEF)
5867 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5868 error_at (DECL_SOURCE_LOCATION (decl
),
5869 "alias definitions not supported in this configuration");
5870 TREE_ASM_WRITTEN (decl
) = 1;
5873 if (!DECL_WEAK (decl
))
5875 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5876 error_at (DECL_SOURCE_LOCATION (decl
),
5877 "ifunc is not supported in this configuration");
5879 error_at (DECL_SOURCE_LOCATION (decl
),
5880 "only weak aliases are supported in this configuration");
5881 TREE_ASM_WRITTEN (decl
) = 1;
5887 TREE_USED (decl
) = 1;
5889 /* Allow aliases to aliases. */
5890 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5891 cgraph_node::get_create (decl
)->alias
= true;
5893 varpool_node::get_create (decl
)->alias
= true;
5895 /* If the target has already been emitted, we don't have to queue the
5896 alias. This saves a tad of memory. */
5897 if (symtab
->global_info_ready
)
5898 target_decl
= find_decl (target
);
5901 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5902 || symtab
->state
>= EXPANSION
)
5903 do_assemble_alias (decl
, target
);
5906 alias_pair p
= {decl
, target
};
5907 vec_safe_push (alias_pairs
, p
);
5911 /* Record and output a table of translations from original function
5912 to its transaction aware clone. Note that tm_pure functions are
5913 considered to be their own clone. */
5915 struct tm_clone_hasher
: ggc_cache_ptr_hash
<tree_map
>
5917 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5918 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5921 keep_cache_entry (tree_map
*&e
)
5923 return ggc_marked_p (e
->base
.from
);
5927 static GTY((cache
)) hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5930 record_tm_clone_pair (tree o
, tree n
)
5932 struct tree_map
**slot
, *h
;
5934 if (tm_clone_hash
== NULL
)
5935 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5937 h
= ggc_alloc
<tree_map
> ();
5938 h
->hash
= htab_hash_pointer (o
);
5942 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5947 get_tm_clone_pair (tree o
)
5951 struct tree_map
*h
, in
;
5954 in
.hash
= htab_hash_pointer (o
);
5955 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5962 struct tm_alias_pair
5970 /* Dump the actual pairs to the .tm_clone_table section. */
5973 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5977 bool switched
= false;
5979 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5983 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5984 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5986 /* The function ipa_tm_create_version() marks the clone as needed if
5987 the original function was needed. But we also mark the clone as
5988 needed if we ever called the clone indirectly through
5989 TM_GETTMCLONE. If neither of these are true, we didn't generate
5990 a clone, and we didn't call it indirectly... no sense keeping it
5991 in the clone table. */
5992 if (!dst_n
|| !dst_n
->definition
)
5995 /* This covers the case where we have optimized the original
5996 function away, and only access the transactional clone. */
5997 if (!src_n
|| !src_n
->definition
)
6002 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
6003 assemble_align (POINTER_SIZE
);
6007 assemble_integer (XEXP (DECL_RTL (src
), 0),
6008 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6009 assemble_integer (XEXP (DECL_RTL (dst
), 0),
6010 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6014 /* Provide a default for the tm_clone_table section. */
6017 default_clone_table_section (void)
6019 return get_named_section (NULL
, ".tm_clone_table", 3);
6022 /* Helper comparison function for qsorting by the DECL_UID stored in
6023 alias_pair->emitted_diags. */
6026 tm_alias_pair_cmp (const void *x
, const void *y
)
6028 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
6029 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
6030 if (p1
->uid
< p2
->uid
)
6032 if (p1
->uid
> p2
->uid
)
6038 finish_tm_clone_pairs (void)
6040 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
6042 if (tm_clone_hash
== NULL
)
6045 /* We need a determenistic order for the .tm_clone_table, otherwise
6046 we will get bootstrap comparison failures, so dump the hash table
6047 to a vector, sort it, and dump the vector. */
6049 /* Dump the hashtable to a vector. */
6051 hash_table
<tm_clone_hasher
>::iterator iter
;
6052 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
6054 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
6055 tm_alias_pairs
.safe_push (p
);
6058 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
6061 dump_tm_clone_pairs (tm_alias_pairs
);
6063 tm_clone_hash
->empty ();
6064 tm_clone_hash
= NULL
;
6065 tm_alias_pairs
.release ();
6069 /* Emit an assembler directive to set symbol for DECL visibility to
6070 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
6073 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
6074 int vis ATTRIBUTE_UNUSED
)
6076 #ifdef HAVE_GAS_HIDDEN
6077 static const char * const visibility_types
[] = {
6078 NULL
, "protected", "hidden", "internal"
6081 const char *name
, *type
;
6084 id
= DECL_ASSEMBLER_NAME (decl
);
6085 ultimate_transparent_alias_target (&id
);
6086 name
= IDENTIFIER_POINTER (id
);
6088 type
= visibility_types
[vis
];
6090 fprintf (asm_out_file
, "\t.%s\t", type
);
6091 assemble_name (asm_out_file
, name
);
6092 fprintf (asm_out_file
, "\n");
6094 if (!DECL_ARTIFICIAL (decl
))
6095 warning (OPT_Wattributes
, "visibility attribute not supported "
6096 "in this configuration; ignored");
6100 /* A helper function to call assemble_visibility when needed for a decl. */
6103 maybe_assemble_visibility (tree decl
)
6105 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
6107 if (TREE_CODE (decl
) == FUNCTION_DECL
6108 && cgraph_node::get (decl
)
6109 && cgraph_node::get (decl
)->instrumentation_clone
6110 && cgraph_node::get (decl
)->instrumented_version
)
6111 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
6113 if (vis
!= VISIBILITY_DEFAULT
)
6115 targetm
.asm_out
.assemble_visibility (decl
, vis
);
6122 /* Returns 1 if the target configuration supports defining public symbols
6123 so that one of them will be chosen at link time instead of generating a
6124 multiply-defined symbol error, whether through the use of weak symbols or
6125 a target-specific mechanism for having duplicates discarded. */
6128 supports_one_only (void)
6130 if (SUPPORTS_ONE_ONLY
)
6132 return TARGET_SUPPORTS_WEAK
;
6135 /* Set up DECL as a public symbol that can be defined in multiple
6136 translation units without generating a linker error. */
6139 make_decl_one_only (tree decl
, tree comdat_group
)
6141 struct symtab_node
*symbol
;
6142 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
6144 TREE_PUBLIC (decl
) = 1;
6147 symbol
= varpool_node::get_create (decl
);
6149 symbol
= cgraph_node::get_create (decl
);
6151 if (SUPPORTS_ONE_ONLY
)
6153 #ifdef MAKE_DECL_ONE_ONLY
6154 MAKE_DECL_ONE_ONLY (decl
);
6156 symbol
->set_comdat_group (comdat_group
);
6158 else if (VAR_P (decl
)
6159 && (DECL_INITIAL (decl
) == 0
6160 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6161 DECL_COMMON (decl
) = 1;
6164 gcc_assert (TARGET_SUPPORTS_WEAK
);
6165 DECL_WEAK (decl
) = 1;
6170 init_varasm_once (void)
6172 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6173 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6174 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6176 shared_constant_pool
= create_constant_pool ();
6178 #ifdef TEXT_SECTION_ASM_OP
6179 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6180 TEXT_SECTION_ASM_OP
);
6183 #ifdef DATA_SECTION_ASM_OP
6184 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6185 DATA_SECTION_ASM_OP
);
6188 #ifdef SDATA_SECTION_ASM_OP
6189 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6190 SDATA_SECTION_ASM_OP
);
6193 #ifdef READONLY_DATA_SECTION_ASM_OP
6194 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6195 READONLY_DATA_SECTION_ASM_OP
);
6198 #ifdef CTORS_SECTION_ASM_OP
6199 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6200 CTORS_SECTION_ASM_OP
);
6203 #ifdef DTORS_SECTION_ASM_OP
6204 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6205 DTORS_SECTION_ASM_OP
);
6208 #ifdef BSS_SECTION_ASM_OP
6209 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6210 output_section_asm_op
,
6211 BSS_SECTION_ASM_OP
);
6214 #ifdef SBSS_SECTION_ASM_OP
6215 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6216 output_section_asm_op
,
6217 SBSS_SECTION_ASM_OP
);
6220 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6221 | SECTION_COMMON
, emit_tls_common
);
6222 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6223 | SECTION_COMMON
, emit_local
);
6224 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6225 | SECTION_COMMON
, emit_common
);
6227 #if defined ASM_OUTPUT_ALIGNED_BSS
6228 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6232 targetm
.asm_out
.init_sections ();
6234 if (readonly_data_section
== NULL
)
6235 readonly_data_section
= text_section
;
6237 #ifdef ASM_OUTPUT_EXTERNAL
6238 pending_assemble_externals_set
= new hash_set
<tree
>;
6243 decl_default_tls_model (const_tree decl
)
6245 enum tls_model kind
;
6248 is_local
= targetm
.binds_local_p (decl
);
6252 kind
= TLS_MODEL_LOCAL_EXEC
;
6254 kind
= TLS_MODEL_INITIAL_EXEC
;
6257 /* Local dynamic is inefficient when we're not combining the
6258 parts of the address. */
6259 else if (optimize
&& is_local
)
6260 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6262 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6263 if (kind
< flag_tls_default
)
6264 kind
= flag_tls_default
;
6269 /* Select a set of attributes for section NAME based on the properties
6270 of DECL and whether or not RELOC indicates that DECL's initializer
6271 might contain runtime relocations.
6273 We make the section read-only and executable for a function decl,
6274 read-only for a const data decl, and writable for a non-const data decl. */
6277 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6281 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6282 flags
= SECTION_CODE
;
6285 enum section_category category
6286 = categorize_decl_for_section (decl
, reloc
);
6287 if (decl_readonly_section_1 (category
))
6289 else if (category
== SECCAT_DATA_REL_RO
6290 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6291 flags
= SECTION_WRITE
| SECTION_RELRO
;
6293 flags
= SECTION_WRITE
;
6297 flags
= SECTION_WRITE
;
6298 if (strcmp (name
, ".data.rel.ro") == 0
6299 || strcmp (name
, ".data.rel.ro.local") == 0)
6300 flags
|= SECTION_RELRO
;
6303 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6304 flags
|= SECTION_LINKONCE
;
6306 if (strcmp (name
, ".vtable_map_vars") == 0)
6307 flags
|= SECTION_LINKONCE
;
6309 if (decl
&& VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6310 flags
|= SECTION_TLS
| SECTION_WRITE
;
6312 if (strcmp (name
, ".bss") == 0
6313 || strncmp (name
, ".bss.", 5) == 0
6314 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6315 || strcmp (name
, ".persistent.bss") == 0
6316 || strcmp (name
, ".sbss") == 0
6317 || strncmp (name
, ".sbss.", 6) == 0
6318 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6319 flags
|= SECTION_BSS
;
6321 if (strcmp (name
, ".tdata") == 0
6322 || strncmp (name
, ".tdata.", 7) == 0
6323 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6324 flags
|= SECTION_TLS
;
6326 if (strcmp (name
, ".tbss") == 0
6327 || strncmp (name
, ".tbss.", 6) == 0
6328 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6329 flags
|= SECTION_TLS
| SECTION_BSS
;
6331 /* These three sections have special ELF types. They are neither
6332 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6333 want to print a section type (@progbits or @nobits). If someone
6334 is silly enough to emit code or TLS variables to one of these
6335 sections, then don't handle them specially. */
6336 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6337 && (strcmp (name
, ".init_array") == 0
6338 || strcmp (name
, ".fini_array") == 0
6339 || strcmp (name
, ".preinit_array") == 0))
6340 flags
|= SECTION_NOTYPE
;
6345 /* Return true if the target supports some form of global BSS,
6346 either through bss_noswitch_section, or by selecting a BSS
6347 section in TARGET_ASM_SELECT_SECTION. */
6350 have_global_bss_p (void)
6352 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6355 /* Output assembly to switch to section NAME with attribute FLAGS.
6356 Four variants for common object file formats. */
6359 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6360 unsigned int flags ATTRIBUTE_UNUSED
,
6361 tree decl ATTRIBUTE_UNUSED
)
6363 /* Some object formats don't support named sections at all. The
6364 front-end should already have flagged this as an error. */
6368 #ifndef TLS_SECTION_ASM_FLAG
6369 #define TLS_SECTION_ASM_FLAG 'T'
6373 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6376 char flagchars
[11], *f
= flagchars
;
6377 unsigned int numeric_value
= 0;
6379 /* If we have already declared this section, we can use an
6380 abbreviated form to switch back to it -- unless this section is
6381 part of a COMDAT groups, in which case GAS requires the full
6382 declaration every time. */
6383 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6384 && (flags
& SECTION_DECLARED
))
6386 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6390 /* If we have a machine specific flag, then use the numeric value to pass
6392 if (targetm
.asm_out
.elf_flags_numeric (flags
, &numeric_value
))
6393 snprintf (f
, sizeof (flagchars
), "0x%08x", numeric_value
);
6396 if (!(flags
& SECTION_DEBUG
))
6398 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6399 if (flags
& SECTION_EXCLUDE
)
6402 if (flags
& SECTION_WRITE
)
6404 if (flags
& SECTION_CODE
)
6406 if (flags
& SECTION_SMALL
)
6408 if (flags
& SECTION_MERGE
)
6410 if (flags
& SECTION_STRINGS
)
6412 if (flags
& SECTION_TLS
)
6413 *f
++ = TLS_SECTION_ASM_FLAG
;
6414 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6416 #ifdef MACH_DEP_SECTION_ASM_FLAG
6417 if (flags
& SECTION_MACH_DEP
)
6418 *f
++ = MACH_DEP_SECTION_ASM_FLAG
;
6423 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6425 if (!(flags
& SECTION_NOTYPE
))
6430 if (flags
& SECTION_BSS
)
6436 /* On platforms that use "@" as the assembly comment character,
6438 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6440 fprintf (asm_out_file
, format
, type
);
6442 if (flags
& SECTION_ENTSIZE
)
6443 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6444 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6446 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6447 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6449 fprintf (asm_out_file
, ",%s,comdat",
6450 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6454 putc ('\n', asm_out_file
);
6458 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6459 tree decl ATTRIBUTE_UNUSED
)
6461 char flagchars
[8], *f
= flagchars
;
6463 if (flags
& SECTION_WRITE
)
6465 if (flags
& SECTION_CODE
)
6469 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6473 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6476 default_coff_asm_named_section (name
, flags
, decl
);
6478 if (flags
& SECTION_LINKONCE
)
6480 /* Functions may have been compiled at various levels of
6481 optimization so we can't use `same_size' here.
6482 Instead, have the linker pick one. */
6483 fprintf (asm_out_file
, "\t.linkonce %s\n",
6484 (flags
& SECTION_CODE
? "discard" : "same_size"));
6488 /* The lame default section selector. */
6491 default_select_section (tree decl
, int reloc
,
6492 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6496 if (decl_readonly_section (decl
, reloc
))
6497 return readonly_data_section
;
6499 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6501 if (! ((flag_pic
&& reloc
)
6502 || !TREE_READONLY (decl
)
6503 || TREE_SIDE_EFFECTS (decl
)
6504 || !TREE_CONSTANT (decl
)))
6505 return readonly_data_section
;
6507 else if (TREE_CODE (decl
) == STRING_CST
)
6508 return readonly_data_section
;
6509 else if (! (flag_pic
&& reloc
))
6510 return readonly_data_section
;
6512 return data_section
;
6515 enum section_category
6516 categorize_decl_for_section (const_tree decl
, int reloc
)
6518 enum section_category ret
;
6520 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6522 else if (TREE_CODE (decl
) == STRING_CST
)
6524 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6525 && asan_protect_global (CONST_CAST_TREE (decl
)))
6526 /* or !flag_merge_constants */
6527 return SECCAT_RODATA
;
6529 return SECCAT_RODATA_MERGE_STR
;
6531 else if (VAR_P (decl
))
6533 if (bss_initializer_p (decl
))
6535 else if (! TREE_READONLY (decl
)
6536 || TREE_SIDE_EFFECTS (decl
)
6537 || (DECL_INITIAL (decl
)
6538 && ! TREE_CONSTANT (DECL_INITIAL (decl
))))
6540 /* Here the reloc_rw_mask is not testing whether the section should
6541 be read-only or not, but whether the dynamic link will have to
6542 do something. If so, we wish to segregate the data in order to
6543 minimize cache misses inside the dynamic linker. */
6544 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6545 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6549 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6550 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6551 else if (reloc
|| flag_merge_constants
< 2
6552 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6553 && asan_protect_global (CONST_CAST_TREE (decl
))))
6554 /* C and C++ don't allow different variables to share the same
6555 location. -fmerge-all-constants allows even that (at the
6556 expense of not conforming). */
6557 ret
= SECCAT_RODATA
;
6558 else if (DECL_INITIAL (decl
)
6559 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6560 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6562 ret
= SECCAT_RODATA_MERGE_CONST
;
6564 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6566 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6567 || TREE_SIDE_EFFECTS (decl
)
6568 || ! TREE_CONSTANT (decl
))
6571 ret
= SECCAT_RODATA
;
6574 ret
= SECCAT_RODATA
;
6576 /* There are no read-only thread-local sections. */
6577 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6579 /* Note that this would be *just* SECCAT_BSS, except that there's
6580 no concept of a read-only thread-local-data section. */
6581 if (ret
== SECCAT_BSS
6582 || DECL_INITIAL (decl
) == NULL
6583 || (flag_zero_initialized_in_bss
6584 && initializer_zerop (DECL_INITIAL (decl
))))
6590 /* If the target uses small data sections, select it. */
6591 else if (targetm
.in_small_data_p (decl
))
6593 if (ret
== SECCAT_BSS
)
6595 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6596 ret
= SECCAT_SRODATA
;
6605 decl_readonly_section_1 (enum section_category category
)
6610 case SECCAT_RODATA_MERGE_STR
:
6611 case SECCAT_RODATA_MERGE_STR_INIT
:
6612 case SECCAT_RODATA_MERGE_CONST
:
6613 case SECCAT_SRODATA
:
6621 decl_readonly_section (const_tree decl
, int reloc
)
6623 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6626 /* Select a section based on the above categorization. */
6629 default_elf_select_section (tree decl
, int reloc
,
6630 unsigned HOST_WIDE_INT align
)
6633 switch (categorize_decl_for_section (decl
, reloc
))
6636 /* We're not supposed to be called on FUNCTION_DECLs. */
6639 return readonly_data_section
;
6640 case SECCAT_RODATA_MERGE_STR
:
6641 return mergeable_string_section (decl
, align
, 0);
6642 case SECCAT_RODATA_MERGE_STR_INIT
:
6643 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6644 case SECCAT_RODATA_MERGE_CONST
:
6645 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6646 case SECCAT_SRODATA
:
6650 return data_section
;
6651 case SECCAT_DATA_REL
:
6652 sname
= ".data.rel";
6654 case SECCAT_DATA_REL_LOCAL
:
6655 sname
= ".data.rel.local";
6657 case SECCAT_DATA_REL_RO
:
6658 sname
= ".data.rel.ro";
6660 case SECCAT_DATA_REL_RO_LOCAL
:
6661 sname
= ".data.rel.ro.local";
6684 return get_named_section (decl
, sname
, reloc
);
6687 /* Construct a unique section name based on the decl name and the
6688 categorization performed above. */
6691 default_unique_section (tree decl
, int reloc
)
6693 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6694 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6695 const char *prefix
, *name
, *linkonce
;
6699 switch (categorize_decl_for_section (decl
, reloc
))
6702 prefix
= one_only
? ".t" : ".text";
6705 case SECCAT_RODATA_MERGE_STR
:
6706 case SECCAT_RODATA_MERGE_STR_INIT
:
6707 case SECCAT_RODATA_MERGE_CONST
:
6708 prefix
= one_only
? ".r" : ".rodata";
6710 case SECCAT_SRODATA
:
6711 prefix
= one_only
? ".s2" : ".sdata2";
6714 prefix
= one_only
? ".d" : ".data";
6716 case SECCAT_DATA_REL
:
6717 prefix
= one_only
? ".d.rel" : ".data.rel";
6719 case SECCAT_DATA_REL_LOCAL
:
6720 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6722 case SECCAT_DATA_REL_RO
:
6723 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6725 case SECCAT_DATA_REL_RO_LOCAL
:
6726 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6729 prefix
= one_only
? ".s" : ".sdata";
6732 prefix
= one_only
? ".b" : ".bss";
6735 prefix
= one_only
? ".sb" : ".sbss";
6738 prefix
= one_only
? ".td" : ".tdata";
6741 prefix
= one_only
? ".tb" : ".tbss";
6747 id
= DECL_ASSEMBLER_NAME (decl
);
6748 ultimate_transparent_alias_target (&id
);
6749 name
= IDENTIFIER_POINTER (id
);
6750 name
= targetm
.strip_name_encoding (name
);
6752 /* If we're using one_only, then there needs to be a .gnu.linkonce
6753 prefix to the section name. */
6754 linkonce
= one_only
? ".gnu.linkonce" : "";
6756 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6758 set_decl_section_name (decl
, string
);
6761 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6764 compute_reloc_for_rtx_1 (const_rtx x
)
6766 switch (GET_CODE (x
))
6769 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6777 /* Like compute_reloc_for_constant, except for an RTX. The return value
6778 is a mask for which bit 1 indicates a global relocation, and bit 0
6779 indicates a local relocation. */
6782 compute_reloc_for_rtx (const_rtx x
)
6784 switch (GET_CODE (x
))
6788 return compute_reloc_for_rtx_1 (x
);
6793 subrtx_iterator::array_type array
;
6794 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6795 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6805 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6807 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6809 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6810 return data_section
;
6812 return readonly_data_section
;
6816 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6817 unsigned HOST_WIDE_INT align
)
6819 int reloc
= compute_reloc_for_rtx (x
);
6821 /* ??? Handle small data here somehow. */
6823 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6826 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6828 return get_named_section (NULL
, ".data.rel.ro", 3);
6831 return mergeable_constant_section (mode
, align
, 0);
6834 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6837 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6842 /* Careful not to prod global register variables. */
6845 symbol
= XEXP (rtl
, 0);
6846 if (GET_CODE (symbol
) != SYMBOL_REF
)
6849 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6850 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6851 flags
|= SYMBOL_FLAG_FUNCTION
;
6852 if (targetm
.binds_local_p (decl
))
6853 flags
|= SYMBOL_FLAG_LOCAL
;
6854 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6855 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6856 else if (targetm
.in_small_data_p (decl
))
6857 flags
|= SYMBOL_FLAG_SMALL
;
6858 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6859 being PUBLIC, the thing *must* be defined in this translation unit.
6860 Prevent this buglet from being propagated into rtl code as well. */
6861 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6862 flags
|= SYMBOL_FLAG_EXTERNAL
;
6864 SYMBOL_REF_FLAGS (symbol
) = flags
;
6867 /* By default, we do nothing for encode_section_info, so we need not
6868 do anything but discard the '*' marker. */
6871 default_strip_name_encoding (const char *str
)
6873 return str
+ (*str
== '*');
6876 #ifdef ASM_OUTPUT_DEF
6877 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6878 anchor relative to ".", the current section position. */
6881 default_asm_output_anchor (rtx symbol
)
6885 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6886 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6887 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6891 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6894 default_use_anchors_for_symbol_p (const_rtx symbol
)
6899 /* Don't use anchors for mergeable sections. The linker might move
6900 the objects around. */
6901 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6902 if (sect
->common
.flags
& SECTION_MERGE
)
6905 /* Don't use anchors for small data sections. The small data register
6906 acts as an anchor for such sections. */
6907 if (sect
->common
.flags
& SECTION_SMALL
)
6910 decl
= SYMBOL_REF_DECL (symbol
);
6911 if (decl
&& DECL_P (decl
))
6913 /* Don't use section anchors for decls that might be defined or
6914 usurped by other modules. */
6915 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6918 /* Don't use section anchors for decls that will be placed in a
6919 small data section. */
6920 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6921 one above. The problem is that we only use SECTION_SMALL for
6922 sections that should be marked as small in the section directive. */
6923 if (targetm
.in_small_data_p (decl
))
6926 /* Don't use section anchors for decls that won't fit inside a single
6927 anchor range to reduce the amount of instructions required to refer
6928 to the entire declaration. */
6929 if (DECL_SIZE_UNIT (decl
) == NULL_TREE
6930 || !tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
))
6931 || (tree_to_uhwi (DECL_SIZE_UNIT (decl
))
6932 >= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
))
6939 /* Return true when RESOLUTION indicate that symbol will be bound to the
6940 definition provided by current .o file. */
6943 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6945 return (resolution
== LDPR_PREVAILING_DEF
6946 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6947 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6950 /* Return true when RESOLUTION indicate that symbol will be bound locally
6951 within current executable or DSO. */
6954 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6956 return (resolution
== LDPR_PREVAILING_DEF
6957 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6958 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6959 || resolution
== LDPR_PREEMPTED_REG
6960 || resolution
== LDPR_PREEMPTED_IR
6961 || resolution
== LDPR_RESOLVED_IR
6962 || resolution
== LDPR_RESOLVED_EXEC
);
6965 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6966 uninitialized common symbol in the executable will still be defined
6967 (through COPY relocation) in the executable. */
6970 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
6971 bool extern_protected_data
, bool common_local_p
)
6973 /* A non-decl is an entry in the constant pool. */
6977 /* Weakrefs may not bind locally, even though the weakref itself is always
6978 static and therefore local. Similarly, the resolver for ifunc functions
6979 might resolve to a non-local function.
6980 FIXME: We can resolve the weakref case more curefuly by looking at the
6982 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6983 || (TREE_CODE (exp
) == FUNCTION_DECL
6984 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6987 /* Static variables are always local. */
6988 if (! TREE_PUBLIC (exp
))
6991 /* With resolution file in hand, take look into resolutions.
6992 We can't just return true for resolved_locally symbols,
6993 because dynamic linking might overwrite symbols
6994 in shared libraries. */
6995 bool resolved_locally
= false;
6997 bool uninited_common
= (DECL_COMMON (exp
)
6998 && (DECL_INITIAL (exp
) == NULL
7000 && DECL_INITIAL (exp
) == error_mark_node
)));
7002 /* A non-external variable is defined locally only if it isn't
7003 uninitialized COMMON variable or common_local_p is true. */
7004 bool defined_locally
= (!DECL_EXTERNAL (exp
)
7005 && (!uninited_common
|| common_local_p
));
7006 if (symtab_node
*node
= symtab_node::get (exp
))
7008 if (node
->in_other_partition
)
7009 defined_locally
= true;
7010 if (node
->can_be_discarded_p ())
7012 else if (resolution_to_local_definition_p (node
->resolution
))
7013 defined_locally
= resolved_locally
= true;
7014 else if (resolution_local_p (node
->resolution
))
7015 resolved_locally
= true;
7017 if (defined_locally
&& weak_dominate
&& !shlib
)
7018 resolved_locally
= true;
7020 /* Undefined weak symbols are never defined locally. */
7021 if (DECL_WEAK (exp
) && !defined_locally
)
7024 /* A symbol is local if the user has said explicitly that it will be,
7025 or if we have a definition for the symbol. We cannot infer visibility
7026 for undefined symbols. */
7027 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
7028 && (TREE_CODE (exp
) == FUNCTION_DECL
7029 || !extern_protected_data
7030 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
7031 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
7034 /* If PIC, then assume that any global name can be overridden by
7035 symbols resolved from other modules. */
7039 /* Variables defined outside this object might not be local. */
7040 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
7043 /* Non-dominant weak symbols are not defined locally. */
7044 if (DECL_WEAK (exp
) && !resolved_locally
)
7047 /* Uninitialized COMMON variable may be unified with symbols
7048 resolved from other modules. */
7049 if (uninited_common
&& !resolved_locally
)
7052 /* Otherwise we're left with initialized (or non-common) global data
7053 which is of necessity defined locally. */
7057 /* Assume ELF-ish defaults, since that's pretty much the most liberal
7058 wrt cross-module name binding. */
7061 default_binds_local_p (const_tree exp
)
7063 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
7066 /* Similar to default_binds_local_p, but common symbol may be local and
7067 extern protected data is non-local. */
7070 default_binds_local_p_2 (const_tree exp
)
7072 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, true,
7077 default_binds_local_p_1 (const_tree exp
, int shlib
)
7079 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
7082 /* Return true when references to DECL must bind to current definition in
7085 The condition is usually equivalent to whether the function binds to the
7086 current module (shared library or executable), that is to binds_local_p.
7087 We use this fact to avoid need for another target hook and implement
7088 the logic using binds_local_p and just special cases where
7089 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
7090 the weak definitions (that can be overwritten at linktime by other
7091 definition from different object file) and when resolution info is available
7092 we simply use the knowledge passed to us by linker plugin. */
7094 decl_binds_to_current_def_p (const_tree decl
)
7096 gcc_assert (DECL_P (decl
));
7097 if (!targetm
.binds_local_p (decl
))
7099 if (!TREE_PUBLIC (decl
))
7102 /* When resolution is available, just use it. */
7103 if (symtab_node
*node
= symtab_node::get (decl
))
7105 if (node
->resolution
!= LDPR_UNKNOWN
7106 && !node
->can_be_discarded_p ())
7107 return resolution_to_local_definition_p (node
->resolution
);
7110 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
7111 binds locally but still can be overwritten), DECL_COMMON (can be merged
7112 with a non-common definition somewhere in the same module) or
7114 This rely on fact that binds_local_p behave as decl_replaceable_p
7115 for all other declaration types. */
7116 if (DECL_WEAK (decl
))
7118 if (DECL_COMMON (decl
)
7119 && (DECL_INITIAL (decl
) == NULL
7120 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
7122 if (DECL_EXTERNAL (decl
))
7127 /* A replaceable function or variable is one which may be replaced
7128 at link-time with an entirely different definition, provided that the
7129 replacement has the same type. For example, functions declared
7130 with __attribute__((weak)) on most systems are replaceable.
7132 COMDAT functions are not replaceable, since all definitions of the
7133 function must be equivalent. It is important that COMDAT functions
7134 not be treated as replaceable so that use of C++ template
7135 instantiations is not penalized. */
7138 decl_replaceable_p (tree decl
)
7140 gcc_assert (DECL_P (decl
));
7141 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
7143 if (!flag_semantic_interposition
7144 && !DECL_WEAK (decl
))
7146 return !decl_binds_to_current_def_p (decl
);
7149 /* Default function to output code that will globalize a label. A
7150 target must define GLOBAL_ASM_OP or provide its own function to
7151 globalize a label. */
7152 #ifdef GLOBAL_ASM_OP
7154 default_globalize_label (FILE * stream
, const char *name
)
7156 fputs (GLOBAL_ASM_OP
, stream
);
7157 assemble_name (stream
, name
);
7158 putc ('\n', stream
);
7160 #endif /* GLOBAL_ASM_OP */
7162 /* Default function to output code that will globalize a declaration. */
7164 default_globalize_decl_name (FILE * stream
, tree decl
)
7166 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7167 targetm
.asm_out
.globalize_label (stream
, name
);
7170 /* Default function to output a label for unwind information. The
7171 default is to do nothing. A target that needs nonlocal labels for
7172 unwind information must provide its own function to do this. */
7174 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7175 tree decl ATTRIBUTE_UNUSED
,
7176 int for_eh ATTRIBUTE_UNUSED
,
7177 int empty ATTRIBUTE_UNUSED
)
7181 /* Default function to output a label to divide up the exception table.
7182 The default is to do nothing. A target that needs/wants to divide
7183 up the table must provide it's own function to do this. */
7185 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7189 /* This is how to output an internal numbered label where PREFIX is
7190 the class of label and LABELNO is the number within the class. */
7193 default_generate_internal_label (char *buf
, const char *prefix
,
7194 unsigned long labelno
)
7196 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7199 /* This is how to output an internal numbered label where PREFIX is
7200 the class of label and LABELNO is the number within the class. */
7203 default_internal_label (FILE *stream
, const char *prefix
,
7204 unsigned long labelno
)
7206 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7207 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7208 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7212 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7215 default_asm_declare_constant_name (FILE *file
, const char *name
,
7216 const_tree exp ATTRIBUTE_UNUSED
,
7217 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7219 assemble_label (file
, name
);
7222 /* This is the default behavior at the beginning of a file. It's
7223 controlled by two other target-hook toggles. */
7225 default_file_start (void)
7227 if (targetm
.asm_file_start_app_off
7228 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7229 fputs (ASM_APP_OFF
, asm_out_file
);
7231 if (targetm
.asm_file_start_file_directive
)
7233 /* LTO produced units have no meaningful main_input_filename. */
7235 output_file_directive (asm_out_file
, "<artificial>");
7237 output_file_directive (asm_out_file
, main_input_filename
);
7241 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7242 which emits a special section directive used to indicate whether or
7243 not this object file needs an executable stack. This is primarily
7244 a GNU extension to ELF but could be used on other targets. */
7246 int trampolines_created
;
7249 file_end_indicate_exec_stack (void)
7251 unsigned int flags
= SECTION_DEBUG
;
7252 if (trampolines_created
)
7253 flags
|= SECTION_CODE
;
7255 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7258 /* Emit a special section directive to indicate that this object file
7259 was compiled with -fsplit-stack. This is used to let the linker
7260 detect calls between split-stack code and non-split-stack code, so
7261 that it can modify the split-stack code to allocate a sufficiently
7262 large stack. We emit another special section if there are any
7263 functions in this file which have the no_split_stack attribute, to
7264 prevent the linker from warning about being unable to convert the
7265 functions if they call non-split-stack code. */
7268 file_end_indicate_split_stack (void)
7270 if (flag_split_stack
)
7272 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7274 if (saw_no_split_stack
)
7275 switch_to_section (get_section (".note.GNU-no-split-stack",
7276 SECTION_DEBUG
, NULL
));
7280 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7281 a get_unnamed_section callback. */
7284 output_section_asm_op (const void *directive
)
7286 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7289 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7290 the current section is NEW_SECTION. */
7293 switch_to_section (section
*new_section
)
7295 if (in_section
== new_section
)
7298 if (new_section
->common
.flags
& SECTION_FORGET
)
7301 in_section
= new_section
;
7303 switch (SECTION_STYLE (new_section
))
7306 targetm
.asm_out
.named_section (new_section
->named
.name
,
7307 new_section
->named
.common
.flags
,
7308 new_section
->named
.decl
);
7311 case SECTION_UNNAMED
:
7312 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7315 case SECTION_NOSWITCH
:
7320 new_section
->common
.flags
|= SECTION_DECLARED
;
7323 /* If block symbol SYMBOL has not yet been assigned an offset, place
7324 it at the end of its block. */
7327 place_block_symbol (rtx symbol
)
7329 unsigned HOST_WIDE_INT size
, mask
, offset
;
7330 struct constant_descriptor_rtx
*desc
;
7331 unsigned int alignment
;
7332 struct object_block
*block
;
7335 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7336 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7339 /* Work out the symbol's size and alignment. */
7340 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7342 desc
= SYMBOL_REF_CONSTANT (symbol
);
7343 alignment
= desc
->align
;
7344 size
= GET_MODE_SIZE (desc
->mode
);
7346 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7348 decl
= SYMBOL_REF_DECL (symbol
);
7349 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7350 alignment
= DECL_ALIGN (decl
);
7351 size
= get_constant_size (DECL_INITIAL (decl
));
7352 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7353 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7354 && asan_protect_global (DECL_INITIAL (decl
)))
7356 size
+= asan_red_zone_size (size
);
7357 alignment
= MAX (alignment
,
7358 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7363 struct symtab_node
*snode
;
7364 decl
= SYMBOL_REF_DECL (symbol
);
7366 snode
= symtab_node::get (decl
);
7369 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7371 gcc_assert (MEM_P (target
)
7372 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7373 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7374 target
= XEXP (target
, 0);
7375 place_block_symbol (target
);
7376 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7379 alignment
= get_variable_align (decl
);
7380 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7381 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7382 && asan_protect_global (decl
))
7384 size
+= asan_red_zone_size (size
);
7385 alignment
= MAX (alignment
,
7386 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7390 /* Calculate the object's offset from the start of the block. */
7391 block
= SYMBOL_REF_BLOCK (symbol
);
7392 mask
= alignment
/ BITS_PER_UNIT
- 1;
7393 offset
= (block
->size
+ mask
) & ~mask
;
7394 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7396 /* Record the block's new alignment and size. */
7397 block
->alignment
= MAX (block
->alignment
, alignment
);
7398 block
->size
= offset
+ size
;
7400 vec_safe_push (block
->objects
, symbol
);
7403 /* Return the anchor that should be used to address byte offset OFFSET
7404 from the first object in BLOCK. MODEL is the TLS model used
7408 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7409 enum tls_model model
)
7412 unsigned int begin
, middle
, end
;
7413 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7416 /* Work out the anchor's offset. Use an offset of 0 for the first
7417 anchor so that we don't pessimize the case where we take the address
7418 of a variable at the beginning of the block. This is particularly
7419 useful when a block has only one variable assigned to it.
7421 We try to place anchors RANGE bytes apart, so there can then be
7422 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7423 a ptr_mode offset. With some target settings, the lowest such
7424 anchor might be out of range for the lowest ptr_mode offset;
7425 likewise the highest anchor for the highest offset. Use anchors
7426 at the extreme ends of the ptr_mode range in such cases.
7428 All arithmetic uses unsigned integers in order to avoid
7430 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7431 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7432 range
= max_offset
- min_offset
+ 1;
7437 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7440 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7441 delta
-= delta
% range
;
7444 offset
= (HOST_WIDE_INT
) (-delta
);
7448 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7449 delta
-= delta
% range
;
7450 if (delta
> bias
- 1)
7452 offset
= (HOST_WIDE_INT
) delta
;
7456 /* Do a binary search to see if there's already an anchor we can use.
7457 Set BEGIN to the new anchor's index if not. */
7459 end
= vec_safe_length (block
->anchors
);
7460 while (begin
!= end
)
7462 middle
= (end
+ begin
) / 2;
7463 anchor
= (*block
->anchors
)[middle
];
7464 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7466 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7468 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7470 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7476 /* Create a new anchor with a unique label. */
7477 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7478 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7479 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7480 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7482 /* Insert it at index BEGIN. */
7483 vec_safe_insert (block
->anchors
, begin
, anchor
);
7487 /* Output the objects in BLOCK. */
7490 output_object_block (struct object_block
*block
)
7492 struct constant_descriptor_rtx
*desc
;
7494 HOST_WIDE_INT offset
;
7498 if (!block
->objects
)
7501 /* Switch to the section and make sure that the first byte is
7502 suitably aligned. */
7503 /* Special case VTV comdat sections similar to assemble_variable. */
7504 if (SECTION_STYLE (block
->sect
) == SECTION_NAMED
7505 && block
->sect
->named
.name
7506 && (strcmp (block
->sect
->named
.name
, ".vtable_map_vars") == 0))
7507 handle_vtv_comdat_section (block
->sect
, block
->sect
->named
.decl
);
7509 switch_to_section (block
->sect
);
7511 assemble_align (block
->alignment
);
7513 /* Define the values of all anchors relative to the current section
7515 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7516 targetm
.asm_out
.output_anchor (symbol
);
7518 /* Output the objects themselves. */
7520 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7522 /* Move to the object's offset, padding with zeros if necessary. */
7523 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7524 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7525 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7527 desc
= SYMBOL_REF_CONSTANT (symbol
);
7528 /* Pass 1 for align as we have already laid out everything in the block.
7529 So aligning shouldn't be necessary. */
7530 output_constant_pool_1 (desc
, 1);
7531 offset
+= GET_MODE_SIZE (desc
->mode
);
7533 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7536 decl
= SYMBOL_REF_DECL (symbol
);
7537 assemble_constant_contents
7538 (DECL_INITIAL (decl
), XSTR (symbol
, 0), DECL_ALIGN (decl
));
7540 size
= get_constant_size (DECL_INITIAL (decl
));
7542 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7543 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7544 && asan_protect_global (DECL_INITIAL (decl
)))
7546 size
= asan_red_zone_size (size
);
7547 assemble_zeros (size
);
7554 decl
= SYMBOL_REF_DECL (symbol
);
7555 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7556 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7558 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7559 && asan_protect_global (decl
))
7561 size
= asan_red_zone_size (size
);
7562 assemble_zeros (size
);
7569 /* A callback for qsort to compare object_blocks. */
7572 output_object_block_compare (const void *x
, const void *y
)
7574 object_block
*p1
= *(object_block
* const*)x
;
7575 object_block
*p2
= *(object_block
* const*)y
;
7577 if (p1
->sect
->common
.flags
& SECTION_NAMED
7578 && !(p2
->sect
->common
.flags
& SECTION_NAMED
))
7581 if (!(p1
->sect
->common
.flags
& SECTION_NAMED
)
7582 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7585 if (p1
->sect
->common
.flags
& SECTION_NAMED
7586 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7587 return strcmp (p1
->sect
->named
.name
, p2
->sect
->named
.name
);
7589 unsigned f1
= p1
->sect
->common
.flags
;
7590 unsigned f2
= p2
->sect
->common
.flags
;
7593 return f1
< f2
? -1 : 1;
7596 /* Output the definitions of all object_blocks. */
7599 output_object_blocks (void)
7601 vec
<object_block
*, va_heap
> v
;
7602 v
.create (object_block_htab
->elements ());
7604 hash_table
<object_block_hasher
>::iterator hi
;
7606 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab
, obj
, object_block
*, hi
)
7609 /* Sort them in order to output them in a deterministic manner,
7610 otherwise we may get .rodata sections in different orders with
7612 v
.qsort (output_object_block_compare
);
7614 FOR_EACH_VEC_ELT (v
, i
, obj
)
7615 output_object_block (obj
);
7620 /* This function provides a possible implementation of the
7621 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7622 by -frecord-gcc-switches it creates a new mergeable, string section in the
7623 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7624 contains the switches in ASCII format.
7626 FIXME: This code does not correctly handle double quote characters
7627 that appear inside strings, (it strips them rather than preserving them).
7628 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7629 characters - instead it treats them as sub-string separators. Since
7630 we want to emit NUL strings terminators into the object file we have to use
7634 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7638 case SWITCH_TYPE_PASSED
:
7639 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7640 ASM_OUTPUT_SKIP (asm_out_file
, HOST_WIDE_INT_1U
);
7643 case SWITCH_TYPE_DESCRIPTIVE
:
7646 /* Distinguish between invocations where name is NULL. */
7647 static bool started
= false;
7653 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7657 | (SECTION_ENTSIZE
& 1),
7659 switch_to_section (sec
);
7668 /* The return value is currently ignored by the caller, but must be 0.
7669 For -fverbose-asm the return value would be the number of characters
7670 emitted into the assembler file. */
7674 /* Emit text to declare externally defined symbols. It is needed to
7675 properly support non-default visibility. */
7677 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7679 const char *name ATTRIBUTE_UNUSED
)
7681 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7682 set in order to avoid putting out names that are never really
7683 used. Always output visibility specified in the source. */
7684 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7685 && (DECL_VISIBILITY_SPECIFIED (decl
)
7686 || targetm
.binds_local_p (decl
)))
7687 maybe_assemble_visibility (decl
);
7690 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7693 default_asm_output_source_filename (FILE *file
, const char *name
)
7695 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7696 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7698 fprintf (file
, "\t.file\t");
7699 output_quoted_string (file
, name
);
7704 /* Output a file name in the form wanted by System V. */
7707 output_file_directive (FILE *asm_file
, const char *input_name
)
7712 if (input_name
== NULL
)
7713 input_name
= "<stdin>";
7715 input_name
= remap_debug_filename (input_name
);
7717 len
= strlen (input_name
);
7718 na
= input_name
+ len
;
7720 /* NA gets INPUT_NAME sans directory names. */
7721 while (na
> input_name
)
7723 if (IS_DIR_SEPARATOR (na
[-1]))
7728 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7731 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7734 make_debug_expr_from_rtl (const_rtx exp
)
7736 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7737 machine_mode mode
= GET_MODE (exp
);
7740 DECL_ARTIFICIAL (ddecl
) = 1;
7741 if (REG_P (exp
) && REG_EXPR (exp
))
7742 type
= TREE_TYPE (REG_EXPR (exp
));
7743 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7744 type
= TREE_TYPE (MEM_EXPR (exp
));
7747 if (type
&& TYPE_MODE (type
) == mode
)
7748 TREE_TYPE (ddecl
) = type
;
7750 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7751 SET_DECL_MODE (ddecl
, mode
);
7752 dval
= gen_rtx_DEBUG_EXPR (mode
);
7753 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7754 SET_DECL_RTL (ddecl
, dval
);
7758 #ifdef ELF_ASCII_ESCAPES
7759 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7762 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7767 fputs (STRING_ASM_OP
, f
);
7772 escape
= ELF_ASCII_ESCAPES
[c
];
7780 putc ('0'+((c
>>6)&7), f
);
7781 putc ('0'+((c
>>3)&7), f
);
7782 putc ('0'+(c
&7), f
);
7795 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7798 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7800 const char *limit
= s
+ len
;
7801 const char *last_null
= NULL
;
7802 unsigned bytes_in_chunk
= 0;
7806 for (; s
< limit
; s
++)
7810 if (bytes_in_chunk
>= 60)
7819 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7826 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7828 if (bytes_in_chunk
> 0)
7835 default_elf_asm_output_limited_string (f
, s
);
7840 if (bytes_in_chunk
== 0)
7841 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7844 escape
= ELF_ASCII_ESCAPES
[c
];
7853 putc ('0'+((c
>>6)&7), f
);
7854 putc ('0'+((c
>>3)&7), f
);
7855 putc ('0'+(c
&7), f
);
7856 bytes_in_chunk
+= 4;
7861 bytes_in_chunk
+= 2;
7868 if (bytes_in_chunk
> 0)
7876 static GTY(()) section
*elf_init_array_section
;
7877 static GTY(()) section
*elf_fini_array_section
;
7880 get_elf_initfini_array_priority_section (int priority
,
7884 if (priority
!= DEFAULT_INIT_PRIORITY
)
7887 sprintf (buf
, "%s.%.5u",
7888 constructor_p
? ".init_array" : ".fini_array",
7890 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7896 if (elf_init_array_section
== NULL
)
7897 elf_init_array_section
7898 = get_section (".init_array",
7899 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7900 sec
= elf_init_array_section
;
7904 if (elf_fini_array_section
== NULL
)
7905 elf_fini_array_section
7906 = get_section (".fini_array",
7907 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7908 sec
= elf_fini_array_section
;
7914 /* Use .init_array section for constructors. */
7917 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7919 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7921 assemble_addr_to_section (symbol
, sec
);
7924 /* Use .fini_array section for destructors. */
7927 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7929 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7931 assemble_addr_to_section (symbol
, sec
);
7934 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7936 This is a bit of a cheat. The real default is a no-op, but this
7937 hook is the default for all targets with a .ident directive. */
7940 default_asm_output_ident_directive (const char *ident_str
)
7942 const char *ident_asm_op
= "\t.ident\t";
7944 /* If we are still in the front end, do not write out the string
7945 to asm_out_file. Instead, add a fake top-level asm statement.
7946 This allows the front ends to use this hook without actually
7947 writing to asm_out_file, to handle #ident or Pragma Ident. */
7948 if (symtab
->state
== PARSING
)
7950 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7951 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7954 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7958 /* This function ensures that vtable_map variables are not only
7959 in the comdat section, but that each variable has its own unique
7960 comdat name. Without this the variables end up in the same section
7961 with a single comdat name.
7963 FIXME: resolve_unique_section needs to deal better with
7964 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
7965 that is fixed, this if-else statement can be replaced with
7966 a single call to "switch_to_section (sect)". */
7969 handle_vtv_comdat_section (section
*sect
, const_tree decl ATTRIBUTE_UNUSED
)
7971 #if defined (OBJECT_FORMAT_ELF)
7972 targetm
.asm_out
.named_section (sect
->named
.name
,
7973 sect
->named
.common
.flags
7978 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
7979 Therefore the following check is used.
7980 In case a the target is PE or COFF a comdat group section
7981 is created, e.g. .vtable_map_vars$foo. The linker places
7982 everything in .vtable_map_vars at the end.
7984 A fix could be made in
7985 gcc/config/i386/winnt.c: i386_pe_unique_section. */
7990 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
7991 name
= ACONCAT ((sect
->named
.name
, "$",
7992 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
7994 name
= ACONCAT ((sect
->named
.name
, "$",
7995 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
7998 targetm
.asm_out
.named_section (name
,
7999 sect
->named
.common
.flags
8005 switch_to_section (sect
);
8009 #include "gt-varasm.h"