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
)));
3010 hi
= 7 + VECTOR_CST_NPATTERNS (exp
);
3011 hi
= hi
* 563 + VECTOR_CST_NELTS_PER_PATTERN (exp
);
3012 unsigned int count
= vector_cst_encoded_nelts (exp
);
3013 for (unsigned int i
= 0; i
< count
; ++i
)
3014 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ENCODED_ELT (exp
, i
));
3020 unsigned HOST_WIDE_INT idx
;
3023 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
3025 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
3027 hi
= hi
* 603 + const_hash_1 (value
);
3035 struct addr_const value
;
3037 decode_addr_const (exp
, &value
);
3038 switch (GET_CODE (value
.base
))
3041 /* Don't hash the address of the SYMBOL_REF;
3042 only use the offset and the symbol name. */
3044 p
= XSTR (value
.base
, 0);
3045 for (i
= 0; p
[i
] != 0; i
++)
3046 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3051 + CODE_LABEL_NUMBER (label_ref_label (value
.base
)) * 13);
3061 case POINTER_PLUS_EXPR
:
3063 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3064 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3067 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3070 /* A language specific constant. Just hash the code. */
3074 /* Compute hashing function. */
3076 for (i
= 0; i
< len
; i
++)
3077 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3082 /* Wrapper of compare_constant, for the htab interface. */
3084 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3085 constant_descriptor_tree
*c2
)
3087 if (c1
->hash
!= c2
->hash
)
3089 return compare_constant (c1
->value
, c2
->value
);
3092 /* Compare t1 and t2, and return 1 only if they are known to result in
3093 the same bit pattern on output. */
3096 compare_constant (const tree t1
, const tree t2
)
3098 enum tree_code typecode
;
3100 if (t1
== NULL_TREE
)
3101 return t2
== NULL_TREE
;
3102 if (t2
== NULL_TREE
)
3105 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3108 switch (TREE_CODE (t1
))
3111 /* Integer constants are the same only if the same width of type. */
3112 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3114 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3116 return tree_int_cst_equal (t1
, t2
);
3119 /* Real constants are the same only if the same width of type. In
3120 addition to the same width, we need to check whether the modes are the
3121 same. There might be two floating point modes that are the same size
3122 but have different representations, such as the PowerPC that has 2
3123 different 128-bit floating point types (IBM extended double and IEEE
3124 128-bit floating point). */
3125 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3127 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3129 return real_identical (&TREE_REAL_CST (t1
), &TREE_REAL_CST (t2
));
3132 /* Fixed constants are the same only if the same width of type. */
3133 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3136 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3139 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3142 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3143 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3144 TREE_STRING_LENGTH (t1
)));
3147 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3148 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3152 if (VECTOR_CST_NPATTERNS (t1
)
3153 != VECTOR_CST_NPATTERNS (t2
))
3156 if (VECTOR_CST_NELTS_PER_PATTERN (t1
)
3157 != VECTOR_CST_NELTS_PER_PATTERN (t2
))
3160 unsigned int count
= vector_cst_encoded_nelts (t1
);
3161 for (unsigned int i
= 0; i
< count
; ++i
)
3162 if (!compare_constant (VECTOR_CST_ENCODED_ELT (t1
, i
),
3163 VECTOR_CST_ENCODED_ELT (t2
, i
)))
3171 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3172 unsigned HOST_WIDE_INT idx
;
3174 typecode
= TREE_CODE (TREE_TYPE (t1
));
3175 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3178 if (typecode
== ARRAY_TYPE
)
3180 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3181 /* For arrays, check that mode, size and storage order match. */
3182 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3184 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
))
3185 || TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t1
))
3186 != TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t2
)))
3191 /* For record and union constructors, require exact type
3193 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3197 v1
= CONSTRUCTOR_ELTS (t1
);
3198 v2
= CONSTRUCTOR_ELTS (t2
);
3199 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3202 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3204 constructor_elt
*c1
= &(*v1
)[idx
];
3205 constructor_elt
*c2
= &(*v2
)[idx
];
3207 /* Check that each value is the same... */
3208 if (!compare_constant (c1
->value
, c2
->value
))
3210 /* ... and that they apply to the same fields! */
3211 if (typecode
== ARRAY_TYPE
)
3213 if (!compare_constant (c1
->index
, c2
->index
))
3218 if (c1
->index
!= c2
->index
)
3229 struct addr_const value1
, value2
;
3233 decode_addr_const (t1
, &value1
);
3234 decode_addr_const (t2
, &value2
);
3236 if (value1
.offset
!= value2
.offset
)
3239 code
= GET_CODE (value1
.base
);
3240 if (code
!= GET_CODE (value2
.base
))
3246 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3250 ret
= (CODE_LABEL_NUMBER (label_ref_label (value1
.base
))
3251 == CODE_LABEL_NUMBER (label_ref_label (value2
.base
)));
3261 case POINTER_PLUS_EXPR
:
3264 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3265 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3268 case VIEW_CONVERT_EXPR
:
3269 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3278 /* Return the section into which constant EXP should be placed. */
3281 get_constant_section (tree exp
, unsigned int align
)
3283 return targetm
.asm_out
.select_section (exp
,
3284 compute_reloc_for_constant (exp
),
3288 /* Return the size of constant EXP in bytes. */
3290 static HOST_WIDE_INT
3291 get_constant_size (tree exp
)
3295 size
= int_size_in_bytes (TREE_TYPE (exp
));
3296 if (TREE_CODE (exp
) == STRING_CST
)
3297 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3301 /* Subroutine of output_constant_def:
3302 No constant equal to EXP is known to have been output.
3303 Make a constant descriptor to enter EXP in the hash table.
3304 Assign the label number and construct RTL to refer to the
3305 constant's location in memory.
3306 Caller is responsible for updating the hash table. */
3308 static struct constant_descriptor_tree
*
3309 build_constant_desc (tree exp
)
3311 struct constant_descriptor_tree
*desc
;
3317 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3320 /* Create a string containing the label name, in LABEL. */
3321 labelno
= const_labelno
++;
3322 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3324 /* Construct the VAR_DECL associated with the constant. */
3325 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3327 DECL_ARTIFICIAL (decl
) = 1;
3328 DECL_IGNORED_P (decl
) = 1;
3329 TREE_READONLY (decl
) = 1;
3330 TREE_STATIC (decl
) = 1;
3331 TREE_ADDRESSABLE (decl
) = 1;
3332 /* We don't set the RTL yet as this would cause varpool to assume that the
3333 variable is referenced. Moreover, it would just be dropped in LTO mode.
3334 Instead we set the flag that will be recognized in make_decl_rtl. */
3335 DECL_IN_CONSTANT_POOL (decl
) = 1;
3336 DECL_INITIAL (decl
) = desc
->value
;
3337 /* ??? targetm.constant_alignment hasn't been updated for vector types on
3338 most architectures so use DATA_ALIGNMENT as well, except for strings. */
3339 if (TREE_CODE (exp
) == STRING_CST
)
3340 SET_DECL_ALIGN (decl
, targetm
.constant_alignment (exp
, DECL_ALIGN (decl
)));
3342 align_variable (decl
, 0);
3344 /* Now construct the SYMBOL_REF and the MEM. */
3345 if (use_object_blocks_p ())
3347 int align
= (TREE_CODE (decl
) == CONST_DECL
3348 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3350 : symtab_node::get (decl
)->definition_alignment ());
3351 section
*sect
= get_constant_section (exp
, align
);
3352 symbol
= create_block_symbol (ggc_strdup (label
),
3353 get_block_for_section (sect
), -1);
3356 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3357 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3358 SET_SYMBOL_REF_DECL (symbol
, decl
);
3359 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3361 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3362 set_mem_attributes (rtl
, exp
, 1);
3363 set_mem_alias_set (rtl
, 0);
3365 /* Putting EXP into the literal pool might have imposed a different
3366 alignment which should be visible in the RTX as well. */
3367 set_mem_align (rtl
, DECL_ALIGN (decl
));
3369 /* We cannot share RTX'es in pool entries.
3370 Mark this piece of RTL as required for unsharing. */
3371 RTX_FLAG (rtl
, used
) = 1;
3373 /* Set flags or add text to the name to record information, such as
3374 that it is a local symbol. If the name is changed, the macro
3375 ASM_OUTPUT_LABELREF will have to know how to strip this
3376 information. This call might invalidate our local variable
3377 SYMBOL; we can't use it afterward. */
3378 targetm
.encode_section_info (exp
, rtl
, true);
3385 /* Return an rtx representing a reference to constant data in memory
3386 for the constant expression EXP.
3388 If assembler code for such a constant has already been output,
3389 return an rtx to refer to it.
3390 Otherwise, output such a constant in memory
3391 and generate an rtx for it.
3393 If DEFER is nonzero, this constant can be deferred and output only
3394 if referenced in the function after all optimizations.
3396 `const_desc_table' records which constants already have label strings. */
3399 output_constant_def (tree exp
, int defer
)
3401 struct constant_descriptor_tree
*desc
;
3402 struct constant_descriptor_tree key
;
3404 /* Look up EXP in the table of constant descriptors. If we didn't find
3405 it, create a new one. */
3407 key
.hash
= const_hash_1 (exp
);
3408 constant_descriptor_tree
**loc
3409 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3414 desc
= build_constant_desc (exp
);
3415 desc
->hash
= key
.hash
;
3419 maybe_output_constant_def_contents (desc
, defer
);
3423 /* Subroutine of output_constant_def: Decide whether or not we need to
3424 output the constant DESC now, and if so, do it. */
3426 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3429 rtx symbol
= XEXP (desc
->rtl
, 0);
3430 tree exp
= desc
->value
;
3432 if (flag_syntax_only
)
3435 if (TREE_ASM_WRITTEN (exp
))
3436 /* Already output; don't do it again. */
3439 /* We can always defer constants as long as the context allows
3443 /* Increment n_deferred_constants if it exists. It needs to be at
3444 least as large as the number of constants actually referred to
3445 by the function. If it's too small we'll stop looking too early
3446 and fail to emit constants; if it's too large we'll only look
3447 through the entire function when we could have stopped earlier. */
3449 n_deferred_constants
++;
3453 output_constant_def_contents (symbol
);
3456 /* Subroutine of output_constant_def_contents. Output the definition
3457 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3458 constant's alignment in bits. */
3461 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3465 size
= get_constant_size (exp
);
3467 /* Do any machine/system dependent processing of the constant. */
3468 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3470 /* Output the value of EXP. */
3471 output_constant (exp
, size
, align
, false);
3473 targetm
.asm_out
.decl_end ();
3476 /* We must output the constant data referred to by SYMBOL; do so. */
3479 output_constant_def_contents (rtx symbol
)
3481 tree decl
= SYMBOL_REF_DECL (symbol
);
3482 tree exp
= DECL_INITIAL (decl
);
3483 bool asan_protected
= false;
3485 /* Make sure any other constants whose addresses appear in EXP
3486 are assigned label numbers. */
3487 output_addressed_constants (exp
);
3489 /* We are no longer deferring this constant. */
3490 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3492 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3493 && TREE_CODE (exp
) == STRING_CST
3494 && asan_protect_global (exp
))
3496 asan_protected
= true;
3497 SET_DECL_ALIGN (decl
, MAX (DECL_ALIGN (decl
),
3498 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
));
3501 /* If the constant is part of an object block, make sure that the
3502 decl has been positioned within its block, but do not write out
3503 its definition yet. output_object_blocks will do that later. */
3504 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3505 place_block_symbol (symbol
);
3508 int align
= (TREE_CODE (decl
) == CONST_DECL
3509 || (VAR_P (decl
) && DECL_IN_CONSTANT_POOL (decl
))
3511 : symtab_node::get (decl
)->definition_alignment ());
3512 switch_to_section (get_constant_section (exp
, align
));
3513 if (align
> BITS_PER_UNIT
)
3514 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3515 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3518 HOST_WIDE_INT size
= get_constant_size (exp
);
3519 assemble_zeros (asan_red_zone_size (size
));
3524 /* Look up EXP in the table of constant descriptors. Return the rtl
3525 if it has been emitted, else null. */
3528 lookup_constant_def (tree exp
)
3530 struct constant_descriptor_tree key
;
3533 key
.hash
= const_hash_1 (exp
);
3534 constant_descriptor_tree
*desc
3535 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3537 return (desc
? desc
->rtl
: NULL_RTX
);
3540 /* Return a tree representing a reference to constant data in memory
3541 for the constant expression EXP.
3543 This is the counterpart of output_constant_def at the Tree level. */
3546 tree_output_constant_def (tree exp
)
3548 struct constant_descriptor_tree
*desc
, key
;
3551 /* Look up EXP in the table of constant descriptors. If we didn't find
3552 it, create a new one. */
3554 key
.hash
= const_hash_1 (exp
);
3555 constant_descriptor_tree
**loc
3556 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3561 desc
= build_constant_desc (exp
);
3562 desc
->hash
= key
.hash
;
3566 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3567 varpool_node::finalize_decl (decl
);
3571 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3572 struct constant_descriptor_rtx
*next
;
3576 HOST_WIDE_INT offset
;
3578 fixed_size_mode mode
;
3584 struct const_rtx_desc_hasher
: ggc_ptr_hash
<constant_descriptor_rtx
>
3586 static hashval_t
hash (constant_descriptor_rtx
*);
3587 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3590 /* Used in the hash tables to avoid outputting the same constant
3591 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3592 are output once per function, not once per file. */
3593 /* ??? Only a few targets need per-function constant pools. Most
3594 can use one per-file pool. Should add a targetm bit to tell the
3597 struct GTY(()) rtx_constant_pool
{
3598 /* Pointers to first and last constant in pool, as ordered by offset. */
3599 struct constant_descriptor_rtx
*first
;
3600 struct constant_descriptor_rtx
*last
;
3602 /* Hash facility for making memory-constants from constant rtl-expressions.
3603 It is used on RISC machines where immediate integer arguments and
3604 constant addresses are restricted so that such constants must be stored
3606 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3608 /* Current offset in constant pool (does not include any
3609 machine-specific header). */
3610 HOST_WIDE_INT offset
;
3613 /* Hash and compare functions for const_rtx_htab. */
3616 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3622 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3623 constant_descriptor_rtx
*y
)
3625 if (x
->mode
!= y
->mode
)
3627 return rtx_equal_p (x
->constant
, y
->constant
);
3630 /* Hash one component of a constant. */
3633 const_rtx_hash_1 (const_rtx x
)
3635 unsigned HOST_WIDE_INT hwi
;
3641 code
= GET_CODE (x
);
3642 mode
= GET_MODE (x
);
3643 h
= (hashval_t
) code
* 1048573 + mode
;
3652 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3653 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3655 h
^= (hashval_t
) hwi
;
3656 for (i
= 1; i
< n
; ++i
)
3659 h
^= (hashval_t
) hwi
;
3664 case CONST_WIDE_INT
:
3667 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3668 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3673 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3675 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3679 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3683 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3687 h
^= htab_hash_string (XSTR (x
, 0));
3691 h
= h
* 251 + CODE_LABEL_NUMBER (label_ref_label (x
));
3695 case UNSPEC_VOLATILE
:
3696 h
= h
* 251 + XINT (x
, 1);
3706 /* Compute a hash value for X, which should be a constant. */
3709 const_rtx_hash (rtx x
)
3712 subrtx_iterator::array_type array
;
3713 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3714 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3719 /* Create and return a new rtx constant pool. */
3721 static struct rtx_constant_pool
*
3722 create_constant_pool (void)
3724 struct rtx_constant_pool
*pool
;
3726 pool
= ggc_alloc
<rtx_constant_pool
> ();
3727 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3734 /* Initialize constant pool hashing for a new function. */
3737 init_varasm_status (void)
3739 crtl
->varasm
.pool
= create_constant_pool ();
3740 crtl
->varasm
.deferred_constants
= 0;
3743 /* Given a MINUS expression, simplify it if both sides
3744 include the same symbol. */
3747 simplify_subtraction (rtx x
)
3749 rtx r
= simplify_rtx (x
);
3753 /* Given a constant rtx X, make (or find) a memory constant for its value
3754 and return a MEM rtx to refer to it in memory. IN_MODE is the mode
3758 force_const_mem (machine_mode in_mode
, rtx x
)
3760 struct constant_descriptor_rtx
*desc
, tmp
;
3761 struct rtx_constant_pool
*pool
;
3766 constant_descriptor_rtx
**slot
;
3767 fixed_size_mode mode
;
3769 /* We can't force variable-sized objects to memory. */
3770 if (!is_a
<fixed_size_mode
> (in_mode
, &mode
))
3773 /* If we're not allowed to drop X into the constant pool, don't. */
3774 if (targetm
.cannot_force_const_mem (mode
, x
))
3777 /* Record that this function has used a constant pool entry. */
3778 crtl
->uses_const_pool
= 1;
3780 /* Decide which pool to use. */
3781 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3782 ? shared_constant_pool
3783 : crtl
->varasm
.pool
);
3785 /* Lookup the value in the hashtable. */
3788 hash
= const_rtx_hash (x
);
3789 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3792 /* If the constant was already present, return its memory. */
3794 return copy_rtx (desc
->mem
);
3796 /* Otherwise, create a new descriptor. */
3797 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3800 /* Align the location counter as required by EXP's data type. */
3801 machine_mode align_mode
= (mode
== VOIDmode
? word_mode
: mode
);
3802 align
= targetm
.static_rtx_alignment (align_mode
);
3804 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3805 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3808 desc
->constant
= copy_rtx (tmp
.constant
);
3809 desc
->offset
= pool
->offset
;
3812 desc
->align
= align
;
3813 desc
->labelno
= const_labelno
;
3816 pool
->offset
+= GET_MODE_SIZE (mode
);
3818 pool
->last
->next
= desc
;
3820 pool
->first
= pool
->last
= desc
;
3823 /* Create a string containing the label name, in LABEL. */
3824 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3827 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3828 the constants pool. */
3829 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3831 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3832 symbol
= create_block_symbol (ggc_strdup (label
),
3833 get_block_for_section (sect
), -1);
3836 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3838 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3839 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3840 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3842 /* Construct the MEM. */
3843 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3844 set_mem_align (def
, align
);
3846 /* If we're dropping a label to the constant pool, make sure we
3848 if (GET_CODE (x
) == LABEL_REF
)
3849 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3851 return copy_rtx (def
);
3854 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3857 get_pool_constant (const_rtx addr
)
3859 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3862 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3863 and whether it has been output or not. */
3866 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3868 struct constant_descriptor_rtx
*desc
;
3870 desc
= SYMBOL_REF_CONSTANT (addr
);
3871 *pmarked
= (desc
->mark
!= 0);
3872 return desc
->constant
;
3875 /* Similar, return the mode. */
3878 get_pool_mode (const_rtx addr
)
3880 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3883 /* Return TRUE if and only if the constant pool has no entries. Note
3884 that even entries we might end up choosing not to emit are counted
3885 here, so there is the potential for missed optimizations. */
3888 constant_pool_empty_p (void)
3890 return crtl
->varasm
.pool
->first
== NULL
;
3893 /* Worker function for output_constant_pool_1. Emit assembly for X
3894 in MODE with known alignment ALIGN. */
3897 output_constant_pool_2 (fixed_size_mode mode
, rtx x
, unsigned int align
)
3899 switch (GET_MODE_CLASS (mode
))
3902 case MODE_DECIMAL_FLOAT
:
3904 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3905 assemble_real (*CONST_DOUBLE_REAL_VALUE (x
),
3906 as_a
<scalar_float_mode
> (mode
), align
, false);
3911 case MODE_PARTIAL_INT
:
3916 case MODE_POINTER_BOUNDS
:
3917 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3920 case MODE_VECTOR_FLOAT
:
3921 case MODE_VECTOR_INT
:
3922 case MODE_VECTOR_FRACT
:
3923 case MODE_VECTOR_UFRACT
:
3924 case MODE_VECTOR_ACCUM
:
3925 case MODE_VECTOR_UACCUM
:
3928 scalar_mode submode
= GET_MODE_INNER (mode
);
3929 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3931 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3932 units
= CONST_VECTOR_NUNITS (x
);
3934 for (i
= 0; i
< units
; i
++)
3936 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3937 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3947 /* Worker function for output_constant_pool. Emit constant DESC,
3948 giving it ALIGN bits of alignment. */
3951 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3958 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3959 whose CODE_LABEL has been deleted. This can occur if a jump table
3960 is eliminated by optimization. If so, write a constant of zero
3961 instead. Note that this can also happen by turning the
3962 CODE_LABEL into a NOTE. */
3963 /* ??? This seems completely and utterly wrong. Certainly it's
3964 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3965 functioning even with rtx_insn::deleted and friends. */
3968 switch (GET_CODE (tmp
))
3971 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3972 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3974 tmp
= XEXP (XEXP (tmp
, 0), 0);
3979 rtx_insn
*insn
= label_ref_label (tmp
);
3980 gcc_assert (!insn
->deleted ());
3981 gcc_assert (!NOTE_P (insn
)
3982 || NOTE_KIND (insn
) != NOTE_INSN_DELETED
);
3990 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3991 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3992 align
, desc
->labelno
, done
);
3995 assemble_align (align
);
3997 /* Output the label. */
3998 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
4001 Pass actual alignment value while emitting string constant to asm code
4002 as function 'output_constant_pool_1' explicitly passes the alignment as 1
4003 assuming that the data is already aligned which prevents the generation
4004 of fix-up table entries. */
4005 output_constant_pool_2 (desc
->mode
, x
, desc
->align
);
4007 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
4008 sections have proper size. */
4009 if (align
> GET_MODE_BITSIZE (desc
->mode
)
4011 && (in_section
->common
.flags
& SECTION_MERGE
))
4012 assemble_align (align
);
4014 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
4020 /* Recompute the offsets of entries in POOL, and the overall size of
4021 POOL. Do this after calling mark_constant_pool to ensure that we
4022 are computing the offset values for the pool which we will actually
4026 recompute_pool_offsets (struct rtx_constant_pool
*pool
)
4028 struct constant_descriptor_rtx
*desc
;
4031 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4034 /* Recalculate offset. */
4035 unsigned int align
= desc
->align
;
4036 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
4037 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
4038 desc
->offset
= pool
->offset
;
4039 pool
->offset
+= GET_MODE_SIZE (desc
->mode
);
4043 /* Mark all constants that are referenced by SYMBOL_REFs in X.
4044 Emit referenced deferred strings. */
4047 mark_constants_in_pattern (rtx insn
)
4049 subrtx_iterator::array_type array
;
4050 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
4052 const_rtx x
= *iter
;
4053 if (GET_CODE (x
) == SYMBOL_REF
)
4055 if (CONSTANT_POOL_ADDRESS_P (x
))
4057 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
4058 if (desc
->mark
== 0)
4061 iter
.substitute (desc
->constant
);
4064 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
4066 tree decl
= SYMBOL_REF_DECL (x
);
4067 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
4069 n_deferred_constants
--;
4070 output_constant_def_contents (CONST_CAST_RTX (x
));
4077 /* Look through appropriate parts of INSN, marking all entries in the
4078 constant pool which are actually being used. Entries that are only
4079 referenced by other constants are also marked as used. Emit
4080 deferred strings that are used. */
4083 mark_constants (rtx_insn
*insn
)
4088 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4089 insns, not any notes that may be attached. We don't want to mark
4090 a constant just because it happens to appear in a REG_EQUIV note. */
4091 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4093 int i
, n
= seq
->len ();
4094 for (i
= 0; i
< n
; ++i
)
4096 rtx subinsn
= seq
->element (i
);
4097 if (INSN_P (subinsn
))
4098 mark_constants_in_pattern (subinsn
);
4102 mark_constants_in_pattern (insn
);
4105 /* Look through the instructions for this function, and mark all the
4106 entries in POOL which are actually being used. Emit deferred constants
4107 which have indeed been used. */
4110 mark_constant_pool (void)
4114 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4117 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4118 mark_constants (insn
);
4121 /* Write all the constants in POOL. */
4124 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4126 struct constant_descriptor_rtx
*desc
;
4128 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4131 /* If the constant is part of an object_block, make sure that
4132 the constant has been positioned within its block, but do not
4133 write out its definition yet. output_object_blocks will do
4135 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4136 && SYMBOL_REF_BLOCK (desc
->sym
))
4137 place_block_symbol (desc
->sym
);
4140 switch_to_section (targetm
.asm_out
.select_rtx_section
4141 (desc
->mode
, desc
->constant
, desc
->align
));
4142 output_constant_pool_1 (desc
, desc
->align
);
4147 /* Mark all constants that are used in the current function, then write
4148 out the function's private constant pool. */
4151 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4152 tree fndecl ATTRIBUTE_UNUSED
)
4154 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4156 /* It is possible for gcc to call force_const_mem and then to later
4157 discard the instructions which refer to the constant. In such a
4158 case we do not need to output the constant. */
4159 mark_constant_pool ();
4161 /* Having marked the constant pool entries we'll actually emit, we
4162 now need to rebuild the offset information, which may have become
4164 recompute_pool_offsets (pool
);
4166 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4167 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4170 output_constant_pool_contents (pool
);
4172 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4173 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4177 /* Write the contents of the shared constant pool. */
4180 output_shared_constant_pool (void)
4182 output_constant_pool_contents (shared_constant_pool
);
4185 /* Determine what kind of relocations EXP may need. */
4188 compute_reloc_for_constant (tree exp
)
4190 int reloc
= 0, reloc2
;
4193 switch (TREE_CODE (exp
))
4197 /* Go inside any operations that get_inner_reference can handle and see
4198 if what's inside is a constant: no need to do anything here for
4199 addresses of variables or functions. */
4200 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4201 tem
= TREE_OPERAND (tem
, 0))
4204 if (TREE_CODE (tem
) == MEM_REF
4205 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4207 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4211 if (!targetm
.binds_local_p (tem
))
4218 case POINTER_PLUS_EXPR
:
4219 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4220 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4224 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4225 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4226 /* The difference of two local labels is computable at link time. */
4227 if (reloc
== 1 && reloc2
== 1)
4234 case VIEW_CONVERT_EXPR
:
4235 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4240 unsigned HOST_WIDE_INT idx
;
4241 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4243 reloc
|= compute_reloc_for_constant (tem
);
4253 /* Find all the constants whose addresses are referenced inside of EXP,
4254 and make sure assembler code with a label has been output for each one.
4255 Indicate whether an ADDR_EXPR has been encountered. */
4258 output_addressed_constants (tree exp
)
4262 switch (TREE_CODE (exp
))
4266 /* Go inside any operations that get_inner_reference can handle and see
4267 if what's inside is a constant: no need to do anything here for
4268 addresses of variables or functions. */
4269 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4270 tem
= TREE_OPERAND (tem
, 0))
4273 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4274 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4275 tem
= DECL_INITIAL (tem
);
4277 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4278 output_constant_def (tem
, 0);
4280 if (TREE_CODE (tem
) == MEM_REF
)
4281 output_addressed_constants (TREE_OPERAND (tem
, 0));
4285 case POINTER_PLUS_EXPR
:
4287 output_addressed_constants (TREE_OPERAND (exp
, 1));
4291 case VIEW_CONVERT_EXPR
:
4292 output_addressed_constants (TREE_OPERAND (exp
, 0));
4297 unsigned HOST_WIDE_INT idx
;
4298 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4300 output_addressed_constants (tem
);
4309 /* Whether a constructor CTOR is a valid static constant initializer if all
4310 its elements are. This used to be internal to initializer_constant_valid_p
4311 and has been exposed to let other functions like categorize_ctor_elements
4312 evaluate the property while walking a constructor for other purposes. */
4315 constructor_static_from_elts_p (const_tree ctor
)
4317 return (TREE_CONSTANT (ctor
)
4318 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4319 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4320 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4323 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4326 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4327 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4328 which are valid when ENDTYPE is an integer of any size; in
4329 particular, this does not accept a pointer minus a constant. This
4330 returns null_pointer_node if the VALUE is an absolute constant
4331 which can be used to initialize a static variable. Otherwise it
4335 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4339 if (!INTEGRAL_TYPE_P (endtype
))
4342 op0
= TREE_OPERAND (value
, 0);
4343 op1
= TREE_OPERAND (value
, 1);
4345 /* Like STRIP_NOPS except allow the operand mode to widen. This
4346 works around a feature of fold that simplifies (int)(p1 - p2) to
4347 ((int)p1 - (int)p2) under the theory that the narrower operation
4350 while (CONVERT_EXPR_P (op0
)
4351 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4353 tree inner
= TREE_OPERAND (op0
, 0);
4354 if (inner
== error_mark_node
4355 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4356 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op0
)))
4357 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4362 while (CONVERT_EXPR_P (op1
)
4363 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4365 tree inner
= TREE_OPERAND (op1
, 0);
4366 if (inner
== error_mark_node
4367 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4368 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op1
)))
4369 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner
)))))
4374 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4378 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4379 cache
? cache
+ 2 : NULL
);
4380 /* Both initializers must be known. */
4384 && (op0
== null_pointer_node
4385 || TREE_CODE (value
) == MINUS_EXPR
))
4386 return null_pointer_node
;
4388 /* Support differences between labels. */
4389 if (TREE_CODE (op0
) == LABEL_DECL
4390 && TREE_CODE (op1
) == LABEL_DECL
)
4391 return null_pointer_node
;
4393 if (TREE_CODE (op0
) == STRING_CST
4394 && TREE_CODE (op1
) == STRING_CST
4395 && operand_equal_p (op0
, op1
, 1))
4396 return null_pointer_node
;
4402 /* Helper function of initializer_constant_valid_p.
4403 Return nonzero if VALUE is a valid constant-valued expression
4404 for use in initializing a static variable; one that can be an
4405 element of a "constant" initializer.
4407 Return null_pointer_node if the value is absolute;
4408 if it is relocatable, return the variable that determines the relocation.
4409 We assume that VALUE has been folded as much as possible;
4410 therefore, we do not need to check for such things as
4411 arithmetic-combinations of integers.
4413 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4416 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4420 switch (TREE_CODE (value
))
4423 if (constructor_static_from_elts_p (value
))
4425 unsigned HOST_WIDE_INT idx
;
4427 bool absolute
= true;
4429 if (cache
&& cache
[0] == value
)
4431 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4434 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4437 /* An absolute value is required with reverse SSO. */
4438 || (reloc
!= null_pointer_node
4439 && TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (value
))
4440 && !AGGREGATE_TYPE_P (TREE_TYPE (elt
))))
4445 cache
[1] = NULL_TREE
;
4449 if (reloc
!= null_pointer_node
)
4452 /* For a non-absolute relocation, there is no single
4453 variable that can be "the variable that determines the
4458 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4460 return absolute
? null_pointer_node
: error_mark_node
;
4463 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4471 return null_pointer_node
;
4476 tree op0
= staticp (TREE_OPERAND (value
, 0));
4479 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4480 to be a constant, this is old-skool offsetof-like nonsense. */
4481 if (TREE_CODE (op0
) == INDIRECT_REF
4482 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4483 return null_pointer_node
;
4484 /* Taking the address of a nested function involves a trampoline,
4485 unless we don't need or want one. */
4486 if (TREE_CODE (op0
) == FUNCTION_DECL
4487 && DECL_STATIC_CHAIN (op0
)
4488 && !TREE_NO_TRAMPOLINE (value
))
4490 /* "&{...}" requires a temporary to hold the constructed
4492 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4498 case NON_LVALUE_EXPR
:
4499 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4502 case VIEW_CONVERT_EXPR
:
4504 tree src
= TREE_OPERAND (value
, 0);
4505 tree src_type
= TREE_TYPE (src
);
4506 tree dest_type
= TREE_TYPE (value
);
4508 /* Allow view-conversions from aggregate to non-aggregate type only
4509 if the bit pattern is fully preserved afterwards; otherwise, the
4510 RTL expander won't be able to apply a subsequent transformation
4511 to the underlying constructor. */
4512 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4514 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4515 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4520 /* Allow all other kinds of view-conversion. */
4521 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4526 tree src
= TREE_OPERAND (value
, 0);
4527 tree src_type
= TREE_TYPE (src
);
4528 tree dest_type
= TREE_TYPE (value
);
4530 /* Allow conversions between pointer types, floating-point
4531 types, and offset types. */
4532 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4533 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4534 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4535 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4536 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4538 /* Allow length-preserving conversions between integer types. */
4539 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4540 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4541 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4543 /* Allow conversions between other integer types only if
4544 explicit value. Don't allow sign-extension to a type larger
4545 than word and pointer, there aren't relocations that would
4546 allow to sign extend it to a wider type. */
4547 if (INTEGRAL_TYPE_P (dest_type
)
4548 && INTEGRAL_TYPE_P (src_type
)
4549 && (TYPE_UNSIGNED (src_type
)
4550 || TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
)
4551 || TYPE_PRECISION (dest_type
) <= BITS_PER_WORD
4552 || TYPE_PRECISION (dest_type
) <= POINTER_SIZE
))
4554 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4555 if (inner
== null_pointer_node
)
4556 return null_pointer_node
;
4560 /* Allow (int) &foo provided int is as wide as a pointer. */
4561 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4562 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4563 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4565 /* Likewise conversions from int to pointers, but also allow
4566 conversions from 0. */
4567 if ((POINTER_TYPE_P (dest_type
)
4568 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4569 && INTEGRAL_TYPE_P (src_type
))
4571 if (TREE_CODE (src
) == INTEGER_CST
4572 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4573 return null_pointer_node
;
4574 if (integer_zerop (src
))
4575 return null_pointer_node
;
4576 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4577 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4580 /* Allow conversions to struct or union types if the value
4582 if (TREE_CODE (dest_type
) == RECORD_TYPE
4583 || TREE_CODE (dest_type
) == UNION_TYPE
)
4584 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4588 case POINTER_PLUS_EXPR
:
4590 /* Any valid floating-point constants will have been folded by now;
4591 with -frounding-math we hit this with addition of two constants. */
4592 if (TREE_CODE (endtype
) == REAL_TYPE
)
4594 if (cache
&& cache
[0] == value
)
4596 if (! INTEGRAL_TYPE_P (endtype
)
4597 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4599 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4601 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4604 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4605 endtype
, ncache
+ 2);
4606 /* If either term is absolute, use the other term's relocation. */
4607 if (valid0
== null_pointer_node
)
4609 else if (valid1
== null_pointer_node
)
4611 /* Support narrowing pointer differences. */
4613 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4617 /* Support narrowing pointer differences. */
4618 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4626 case POINTER_DIFF_EXPR
:
4628 if (TREE_CODE (endtype
) == REAL_TYPE
)
4630 if (cache
&& cache
[0] == value
)
4632 if (! INTEGRAL_TYPE_P (endtype
)
4633 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4635 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4637 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4640 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4641 endtype
, ncache
+ 2);
4642 /* Win if second argument is absolute. */
4643 if (valid1
== null_pointer_node
)
4645 /* Win if both arguments have the same relocation.
4646 Then the value is absolute. */
4647 else if (valid0
== valid1
&& valid0
!= 0)
4648 ret
= null_pointer_node
;
4649 /* Since GCC guarantees that string constants are unique in the
4650 generated code, a subtraction between two copies of the same
4651 constant string is absolute. */
4652 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4653 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4654 && operand_equal_p (valid0
, valid1
, 1))
4655 ret
= null_pointer_node
;
4656 /* Support narrowing differences. */
4658 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4662 /* Support narrowing differences. */
4663 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4678 /* Return nonzero if VALUE is a valid constant-valued expression
4679 for use in initializing a static variable; one that can be an
4680 element of a "constant" initializer.
4682 Return null_pointer_node if the value is absolute;
4683 if it is relocatable, return the variable that determines the relocation.
4684 We assume that VALUE has been folded as much as possible;
4685 therefore, we do not need to check for such things as
4686 arithmetic-combinations of integers. */
4688 initializer_constant_valid_p (tree value
, tree endtype
, bool reverse
)
4690 tree reloc
= initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4692 /* An absolute value is required with reverse storage order. */
4694 && reloc
!= null_pointer_node
4696 && !AGGREGATE_TYPE_P (endtype
)
4697 && !VECTOR_TYPE_P (endtype
))
4703 /* Return true if VALUE is a valid constant-valued expression
4704 for use in initializing a static bit-field; one that can be
4705 an element of a "constant" initializer. */
4708 initializer_constant_valid_for_bitfield_p (tree value
)
4710 /* For bitfields we support integer constants or possibly nested aggregates
4712 switch (TREE_CODE (value
))
4716 unsigned HOST_WIDE_INT idx
;
4719 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4720 if (!initializer_constant_valid_for_bitfield_p (elt
))
4729 case VIEW_CONVERT_EXPR
:
4730 case NON_LVALUE_EXPR
:
4732 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4741 /* output_constructor outer state of relevance in recursive calls, typically
4742 for nested aggregate bitfields. */
4744 struct oc_outer_state
{
4745 unsigned int bit_offset
; /* current position in ... */
4746 int byte
; /* ... the outer byte buffer. */
4749 static unsigned HOST_WIDE_INT
4750 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int, bool,
4753 /* Output assembler code for constant EXP, with no label.
4754 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4755 Assumes output_addressed_constants has been done on EXP already.
4757 Generate at least SIZE bytes of assembler data, padding at the end
4758 with zeros if necessary. SIZE must always be specified. The returned
4759 value is the actual number of bytes of assembler data generated, which
4760 may be bigger than SIZE if the object contains a variable length field.
4762 SIZE is important for structure constructors,
4763 since trailing members may have been omitted from the constructor.
4764 It is also important for initialization of arrays from string constants
4765 since the full length of the string constant might not be wanted.
4766 It is also needed for initialization of unions, where the initializer's
4767 type is just one member, and that may not be as long as the union.
4769 There a case in which we would fail to output exactly SIZE bytes:
4770 for a structure constructor that wants to produce more than SIZE bytes.
4771 But such constructors will never be generated for any possible input.
4773 ALIGN is the alignment of the data in bits.
4775 If REVERSE is true, EXP is output in reverse storage order. */
4777 static unsigned HOST_WIDE_INT
4778 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
4781 enum tree_code code
;
4782 unsigned HOST_WIDE_INT thissize
;
4785 if (size
== 0 || flag_syntax_only
)
4788 /* See if we're trying to initialize a pointer in a non-default mode
4789 to the address of some declaration somewhere. If the target says
4790 the mode is valid for pointers, assume the target has a way of
4792 if (TREE_CODE (exp
) == NOP_EXPR
4793 && POINTER_TYPE_P (TREE_TYPE (exp
))
4794 && targetm
.addr_space
.valid_pointer_mode
4795 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
4796 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4798 tree saved_type
= TREE_TYPE (exp
);
4800 /* Peel off any intermediate conversions-to-pointer for valid
4802 while (TREE_CODE (exp
) == NOP_EXPR
4803 && POINTER_TYPE_P (TREE_TYPE (exp
))
4804 && targetm
.addr_space
.valid_pointer_mode
4805 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp
)),
4806 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4807 exp
= TREE_OPERAND (exp
, 0);
4809 /* If what we're left with is the address of something, we can
4810 convert the address to the final type and output it that
4812 if (TREE_CODE (exp
) == ADDR_EXPR
)
4813 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4814 /* Likewise for constant ints. */
4815 else if (TREE_CODE (exp
) == INTEGER_CST
)
4816 exp
= fold_convert (saved_type
, exp
);
4820 /* Eliminate any conversions since we'll be outputting the underlying
4822 while (CONVERT_EXPR_P (exp
)
4823 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4824 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4826 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4827 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4829 /* Make sure eliminating the conversion is really a no-op, except with
4830 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4831 union types to allow for Ada unchecked unions. */
4832 if (type_size
> op_size
4833 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4834 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4835 /* Keep the conversion. */
4838 exp
= TREE_OPERAND (exp
, 0);
4841 code
= TREE_CODE (TREE_TYPE (exp
));
4842 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4844 /* Allow a constructor with no elements for any data type.
4845 This means to fill the space with zeros. */
4846 if (TREE_CODE (exp
) == CONSTRUCTOR
4847 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4849 assemble_zeros (size
);
4853 if (TREE_CODE (exp
) == FDESC_EXPR
)
4855 #ifdef ASM_OUTPUT_FDESC
4856 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4857 tree decl
= TREE_OPERAND (exp
, 0);
4858 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4865 /* Now output the underlying data. If we've handling the padding, return.
4866 Otherwise, break and ensure SIZE is the size written. */
4873 case REFERENCE_TYPE
:
4875 case FIXED_POINT_TYPE
:
4876 case POINTER_BOUNDS_TYPE
:
4878 cst
= expand_expr (exp
, NULL_RTX
, VOIDmode
, EXPAND_INITIALIZER
);
4880 cst
= flip_storage_order (TYPE_MODE (TREE_TYPE (exp
)), cst
);
4881 if (!assemble_integer (cst
, MIN (size
, thissize
), align
, 0))
4882 error ("initializer for integer/fixed-point value is too complicated");
4886 if (TREE_CODE (exp
) != REAL_CST
)
4887 error ("initializer for floating value is not a floating constant");
4889 assemble_real (TREE_REAL_CST (exp
),
4890 SCALAR_FLOAT_TYPE_MODE (TREE_TYPE (exp
)),
4895 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
, reverse
);
4896 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4897 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)),
4903 switch (TREE_CODE (exp
))
4906 return output_constructor (exp
, size
, align
, reverse
, NULL
);
4909 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4910 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4914 scalar_mode inner
= SCALAR_TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4915 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4916 int elt_size
= GET_MODE_SIZE (inner
);
4917 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
,
4919 thissize
= elt_size
;
4920 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4922 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
,
4924 thissize
+= elt_size
;
4935 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4936 return output_constructor (exp
, size
, align
, reverse
, NULL
);
4945 if (size
> thissize
)
4946 assemble_zeros (size
- thissize
);
4951 /* Subroutine of output_constructor, used for computing the size of
4952 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4953 type with an unspecified upper bound. */
4955 static unsigned HOST_WIDE_INT
4956 array_size_for_constructor (tree val
)
4959 unsigned HOST_WIDE_INT cnt
;
4960 tree index
, value
, tmp
;
4963 /* This code used to attempt to handle string constants that are not
4964 arrays of single-bytes, but nothing else does, so there's no point in
4966 if (TREE_CODE (val
) == STRING_CST
)
4967 return TREE_STRING_LENGTH (val
);
4969 max_index
= NULL_TREE
;
4970 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4972 if (TREE_CODE (index
) == RANGE_EXPR
)
4973 index
= TREE_OPERAND (index
, 1);
4974 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4978 if (max_index
== NULL_TREE
)
4981 /* Compute the total number of array elements. */
4982 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4983 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4985 /* Multiply by the array element unit size to find number of bytes. */
4986 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4988 gcc_assert (wi::fits_uhwi_p (i
));
4989 return i
.to_uhwi ();
4992 /* Other datastructures + helpers for output_constructor. */
4994 /* output_constructor local state to support interaction with helpers. */
4996 struct oc_local_state
{
4998 /* Received arguments. */
4999 tree exp
; /* Constructor expression. */
5000 tree type
; /* Type of constructor expression. */
5001 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
5002 unsigned int align
; /* Known initial alignment. */
5003 tree min_index
; /* Lower bound if specified for an array. */
5005 /* Output processing state. */
5006 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
5007 int byte
; /* Part of a bitfield byte yet to be output. */
5008 int last_relative_index
; /* Implicit or explicit index of the last
5009 array element output within a bitfield. */
5010 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
5011 bool reverse
; /* Whether reverse storage order is in use. */
5013 /* Current element. */
5014 tree field
; /* Current field decl in a record. */
5015 tree val
; /* Current element value. */
5016 tree index
; /* Current element index. */
5020 /* Helper for output_constructor. From the current LOCAL state, output a
5021 RANGE_EXPR element. */
5024 output_constructor_array_range (oc_local_state
*local
)
5026 unsigned HOST_WIDE_INT fieldsize
5027 = int_size_in_bytes (TREE_TYPE (local
->type
));
5029 HOST_WIDE_INT lo_index
5030 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
5031 HOST_WIDE_INT hi_index
5032 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
5033 HOST_WIDE_INT index
;
5036 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
5038 for (index
= lo_index
; index
<= hi_index
; index
++)
5040 /* Output the element's initial value. */
5041 if (local
->val
== NULL_TREE
)
5042 assemble_zeros (fieldsize
);
5045 = output_constant (local
->val
, fieldsize
, align2
, local
->reverse
);
5047 /* Count its size. */
5048 local
->total_bytes
+= fieldsize
;
5052 /* Helper for output_constructor. From the current LOCAL state, output a
5053 field element that is not true bitfield or part of an outer one. */
5056 output_constructor_regular_field (oc_local_state
*local
)
5058 /* Field size and position. Since this structure is static, we know the
5059 positions are constant. */
5060 unsigned HOST_WIDE_INT fieldsize
;
5061 HOST_WIDE_INT fieldpos
;
5063 unsigned int align2
;
5065 /* Output any buffered-up bit-fields preceding this element. */
5066 if (local
->byte_buffer_in_use
)
5068 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5069 local
->total_bytes
++;
5070 local
->byte_buffer_in_use
= false;
5073 if (local
->index
!= NULL_TREE
)
5075 /* Perform the index calculation in modulo arithmetic but
5076 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
5077 but we are using an unsigned sizetype. */
5078 unsigned prec
= TYPE_PRECISION (sizetype
);
5079 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
5080 - wi::to_offset (local
->min_index
), prec
);
5081 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
5084 else if (local
->field
!= NULL_TREE
)
5085 fieldpos
= int_byte_position (local
->field
);
5089 /* Advance to offset of this element.
5090 Note no alignment needed in an array, since that is guaranteed
5091 if each element has the proper size. */
5092 if (local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
5094 if (fieldpos
> local
->total_bytes
)
5096 assemble_zeros (fieldpos
- local
->total_bytes
);
5097 local
->total_bytes
= fieldpos
;
5100 /* Must not go backwards. */
5101 gcc_assert (fieldpos
== local
->total_bytes
);
5104 /* Find the alignment of this element. */
5105 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
5107 /* Determine size this element should occupy. */
5112 /* If this is an array with an unspecified upper bound,
5113 the initializer determines the size. */
5114 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5115 but we cannot do this until the deprecated support for
5116 initializing zero-length array members is removed. */
5117 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
5118 && (!TYPE_DOMAIN (TREE_TYPE (local
->field
))
5119 || !TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
)))))
5121 fieldsize
= array_size_for_constructor (local
->val
);
5122 /* Given a non-empty initialization, this field had better
5123 be last. Given a flexible array member, the next field
5124 on the chain is a TYPE_DECL of the enclosing struct. */
5125 const_tree next
= DECL_CHAIN (local
->field
);
5126 gcc_assert (!fieldsize
|| !next
|| TREE_CODE (next
) != FIELD_DECL
);
5129 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5132 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5134 /* Output the element's initial value. */
5135 if (local
->val
== NULL_TREE
)
5136 assemble_zeros (fieldsize
);
5139 = output_constant (local
->val
, fieldsize
, align2
, local
->reverse
);
5141 /* Count its size. */
5142 local
->total_bytes
+= fieldsize
;
5145 /* Helper for output_constructor. From the LOCAL state, output an element
5146 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5147 from the start of a possibly ongoing outer byte buffer. */
5150 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5152 /* Bit size of this element. */
5153 HOST_WIDE_INT ebitsize
5155 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5156 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5158 /* Relative index of this element if this is an array component. */
5159 HOST_WIDE_INT relative_index
5162 ? (tree_to_shwi (local
->index
)
5163 - tree_to_shwi (local
->min_index
))
5164 : local
->last_relative_index
+ 1)
5167 /* Bit position of this element from the start of the containing
5169 HOST_WIDE_INT constructor_relative_ebitpos
5171 ? int_bit_position (local
->field
)
5172 : ebitsize
* relative_index
);
5174 /* Bit position of this element from the start of a possibly ongoing
5175 outer byte buffer. */
5176 HOST_WIDE_INT byte_relative_ebitpos
5177 = bit_offset
+ constructor_relative_ebitpos
;
5179 /* From the start of a possibly ongoing outer byte buffer, offsets to
5180 the first bit of this element and to the first bit past the end of
5182 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5183 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5185 local
->last_relative_index
= relative_index
;
5187 if (local
->val
== NULL_TREE
)
5188 local
->val
= integer_zero_node
;
5190 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5191 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5192 local
->val
= TREE_OPERAND (local
->val
, 0);
5194 if (TREE_CODE (local
->val
) != INTEGER_CST
5195 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5197 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5201 /* If this field does not start in this (or next) byte, skip some bytes. */
5202 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5204 /* Output remnant of any bit field in previous bytes. */
5205 if (local
->byte_buffer_in_use
)
5207 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5208 local
->total_bytes
++;
5209 local
->byte_buffer_in_use
= false;
5212 /* If still not at proper byte, advance to there. */
5213 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5215 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5216 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5217 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5221 /* Set up the buffer if necessary. */
5222 if (!local
->byte_buffer_in_use
)
5226 local
->byte_buffer_in_use
= true;
5229 /* If this is nested constructor, recurse passing the bit offset and the
5230 pending data, then retrieve the new pending data afterwards. */
5231 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5233 oc_outer_state temp_state
;
5234 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5235 temp_state
.byte
= local
->byte
;
5237 += output_constructor (local
->val
, 0, 0, local
->reverse
, &temp_state
);
5238 local
->byte
= temp_state
.byte
;
5242 /* Otherwise, we must split the element into pieces that fall within
5243 separate bytes, and combine each byte with previous or following
5245 while (next_offset
< end_offset
)
5249 HOST_WIDE_INT value
;
5250 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5251 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5253 /* Advance from byte to byte within this element when necessary. */
5254 while (next_byte
!= local
->total_bytes
)
5256 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5257 local
->total_bytes
++;
5261 /* Number of bits we can process at once (all part of the same byte). */
5262 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5263 if (local
->reverse
? !BYTES_BIG_ENDIAN
: BYTES_BIG_ENDIAN
)
5265 /* For big-endian data, take the most significant bits (of the
5266 bits that are significant) first and put them into bytes from
5267 the most significant end. */
5268 shift
= end_offset
- next_offset
- this_time
;
5270 /* Don't try to take a bunch of bits that cross
5271 the word boundary in the INTEGER_CST. We can
5272 only select bits from one element. */
5273 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5274 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5276 const int end
= shift
+ this_time
- 1;
5277 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5278 this_time
= end
- shift
+ 1;
5281 /* Now get the bits from the appropriate constant word. */
5282 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5283 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5285 /* Get the result. This works only when:
5286 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5287 local
->byte
|= (((value
>> shift
)
5288 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5289 << (BITS_PER_UNIT
- this_time
- next_bit
));
5293 /* On little-endian machines, take the least significant bits of
5294 the value first and pack them starting at the least significant
5295 bits of the bytes. */
5296 shift
= next_offset
- byte_relative_ebitpos
;
5298 /* Don't try to take a bunch of bits that cross
5299 the word boundary in the INTEGER_CST. We can
5300 only select bits from one element. */
5301 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5302 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5304 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5306 /* Now get the bits from the appropriate constant word. */
5307 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5308 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5310 /* Get the result. This works only when:
5311 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5312 local
->byte
|= (((value
>> shift
)
5313 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5317 next_offset
+= this_time
;
5318 local
->byte_buffer_in_use
= true;
5322 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5323 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5324 caller output state of relevance in recursive invocations. */
5326 static unsigned HOST_WIDE_INT
5327 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
,
5328 bool reverse
, oc_outer_state
*outer
)
5330 unsigned HOST_WIDE_INT cnt
;
5331 constructor_elt
*ce
;
5332 oc_local_state local
;
5334 /* Setup our local state to communicate with helpers. */
5336 local
.type
= TREE_TYPE (exp
);
5338 local
.align
= align
;
5339 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5340 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5342 local
.min_index
= integer_zero_node
;
5344 local
.total_bytes
= 0;
5345 local
.byte_buffer_in_use
= outer
!= NULL
;
5346 local
.byte
= outer
? outer
->byte
: 0;
5347 local
.last_relative_index
= -1;
5348 /* The storage order is specified for every aggregate type. */
5349 if (AGGREGATE_TYPE_P (local
.type
))
5350 local
.reverse
= TYPE_REVERSE_STORAGE_ORDER (local
.type
);
5352 local
.reverse
= reverse
;
5354 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5356 /* As CE goes through the elements of the constant, FIELD goes through the
5357 structure fields if the constant is a structure. If the constant is a
5358 union, we override this by getting the field from the TREE_LIST element.
5359 But the constant could also be an array. Then FIELD is zero.
5361 There is always a maximum of one element in the chain LINK for unions
5362 (even if the initializer in a source program incorrectly contains
5365 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5366 local
.field
= TYPE_FIELDS (local
.type
);
5368 local
.field
= NULL_TREE
;
5371 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5372 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5374 local
.val
= ce
->value
;
5375 local
.index
= NULL_TREE
;
5377 /* The element in a union constructor specifies the proper field
5379 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5380 local
.field
= ce
->index
;
5382 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5383 local
.index
= ce
->index
;
5385 if (local
.field
&& flag_verbose_asm
)
5386 fprintf (asm_out_file
, "%s %s:\n",
5388 DECL_NAME (local
.field
)
5389 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5392 /* Eliminate the marker that makes a cast not be an lvalue. */
5393 if (local
.val
!= NULL_TREE
)
5394 STRIP_NOPS (local
.val
);
5396 /* Output the current element, using the appropriate helper ... */
5398 /* For an array slice not part of an outer bitfield. */
5400 && local
.index
!= NULL_TREE
5401 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5402 output_constructor_array_range (&local
);
5404 /* For a field that is neither a true bitfield nor part of an outer one,
5405 known to be at least byte aligned and multiple-of-bytes long. */
5407 && (local
.field
== NULL_TREE
5408 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5409 output_constructor_regular_field (&local
);
5411 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5412 supported for scalar fields, so we may need to convert first. */
5415 if (TREE_CODE (local
.val
) == REAL_CST
)
5417 = fold_unary (VIEW_CONVERT_EXPR
,
5418 build_nonstandard_integer_type
5419 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5421 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5425 /* If we are not at toplevel, save the pending data for our caller.
5426 Otherwise output the pending data and padding zeros as needed. */
5428 outer
->byte
= local
.byte
;
5431 if (local
.byte_buffer_in_use
)
5433 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5434 local
.total_bytes
++;
5437 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5439 assemble_zeros (local
.size
- local
.total_bytes
);
5440 local
.total_bytes
= local
.size
;
5444 return local
.total_bytes
;
5447 /* Mark DECL as weak. */
5450 mark_weak (tree decl
)
5452 if (DECL_WEAK (decl
))
5455 struct symtab_node
*n
= symtab_node::get (decl
);
5456 if (n
&& n
->refuse_visibility_changes
)
5457 error ("%+qD declared weak after being used", decl
);
5458 DECL_WEAK (decl
) = 1;
5460 if (DECL_RTL_SET_P (decl
)
5461 && MEM_P (DECL_RTL (decl
))
5462 && XEXP (DECL_RTL (decl
), 0)
5463 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5464 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5467 /* Merge weak status between NEWDECL and OLDDECL. */
5470 merge_weak (tree newdecl
, tree olddecl
)
5472 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5474 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5477 /* We put the NEWDECL on the weak_decls list at some point
5478 and OLDDECL as well. Keep just OLDDECL on the list. */
5479 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5480 if (TREE_VALUE (*pwd
) == newdecl
)
5482 *pwd
= TREE_CHAIN (*pwd
);
5489 if (DECL_WEAK (newdecl
))
5493 /* NEWDECL is weak, but OLDDECL is not. */
5495 /* If we already output the OLDDECL, we're in trouble; we can't
5496 go back and make it weak. This should never happen in
5497 unit-at-a-time compilation. */
5498 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5500 /* If we've already generated rtl referencing OLDDECL, we may
5501 have done so in a way that will not function properly with
5502 a weak symbol. Again in unit-at-a-time this should be
5504 gcc_assert (!TREE_USED (olddecl
)
5505 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5507 /* PR 49899: You cannot convert a static function into a weak, public function. */
5508 if (! TREE_PUBLIC (olddecl
) && TREE_PUBLIC (newdecl
))
5509 error ("weak declaration of %q+D being applied to a already "
5510 "existing, static definition", newdecl
);
5512 if (TARGET_SUPPORTS_WEAK
)
5514 /* We put the NEWDECL on the weak_decls list at some point.
5515 Replace it with the OLDDECL. */
5516 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5517 if (TREE_VALUE (wd
) == newdecl
)
5519 TREE_VALUE (wd
) = olddecl
;
5522 /* We may not find the entry on the list. If NEWDECL is a
5523 weak alias, then we will have already called
5524 globalize_decl to remove the entry; in that case, we do
5525 not need to do anything. */
5528 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5529 mark_weak (olddecl
);
5532 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5533 weak. Just update NEWDECL to indicate that it's weak too. */
5534 mark_weak (newdecl
);
5537 /* Declare DECL to be a weak symbol. */
5540 declare_weak (tree decl
)
5542 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5543 if (! TREE_PUBLIC (decl
))
5545 error ("weak declaration of %q+D must be public", decl
);
5548 else if (!TARGET_SUPPORTS_WEAK
)
5549 warning (0, "weak declaration of %q+D not supported", decl
);
5552 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5553 DECL_ATTRIBUTES (decl
)
5554 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5558 weak_finish_1 (tree decl
)
5560 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5561 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5564 if (! TREE_USED (decl
))
5567 #ifdef ASM_WEAKEN_DECL
5568 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5570 #ifdef ASM_WEAKEN_LABEL
5571 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5573 #ifdef ASM_OUTPUT_WEAK_ALIAS
5575 static bool warn_once
= 0;
5578 warning (0, "only weak aliases are supported in this configuration");
5588 /* Fiven an assembly name, find the decl it is associated with. */
5590 find_decl (tree target
)
5592 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5598 /* This TREE_LIST contains weakref targets. */
5600 static GTY(()) tree weakref_targets
;
5602 /* Emit any pending weak declarations. */
5609 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5611 tree alias_decl
= TREE_PURPOSE (t
);
5612 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5614 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5615 /* Remove alias_decl from the weak list, but leave entries for
5616 the target alone. */
5618 #ifndef ASM_OUTPUT_WEAKREF
5619 else if (! TREE_SYMBOL_REFERENCED (target
))
5621 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5622 defined, otherwise we and weak_finish_1 would use
5623 different macros. */
5624 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5625 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5627 tree decl
= find_decl (target
);
5631 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5632 TREE_CODE (alias_decl
), target
,
5633 TREE_TYPE (alias_decl
));
5635 DECL_EXTERNAL (decl
) = 1;
5636 TREE_PUBLIC (decl
) = 1;
5637 DECL_ARTIFICIAL (decl
) = 1;
5638 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5639 TREE_USED (decl
) = 1;
5642 weak_finish_1 (decl
);
5651 /* Remove the alias and the target from the pending weak list
5652 so that we do not emit any .weak directives for the former,
5653 nor multiple .weak directives for the latter. */
5654 for (p
= &weak_decls
; (t2
= *p
) ; )
5656 if (TREE_VALUE (t2
) == alias_decl
5657 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5658 *p
= TREE_CHAIN (t2
);
5660 p
= &TREE_CHAIN (t2
);
5663 /* Remove other weakrefs to the same target, to speed things up. */
5664 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5666 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5667 *p
= TREE_CHAIN (t2
);
5669 p
= &TREE_CHAIN (t2
);
5674 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5676 tree decl
= TREE_VALUE (t
);
5678 weak_finish_1 (decl
);
5682 /* Emit the assembly bits to indicate that DECL is globally visible. */
5685 globalize_decl (tree decl
)
5688 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5689 if (DECL_WEAK (decl
))
5691 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5694 #ifdef ASM_WEAKEN_DECL
5695 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5697 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5700 /* Remove this function from the pending weak list so that
5701 we do not emit multiple .weak directives for it. */
5702 for (p
= &weak_decls
; (t
= *p
) ; )
5704 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5705 *p
= TREE_CHAIN (t
);
5707 p
= &TREE_CHAIN (t
);
5710 /* Remove weakrefs to the same target from the pending weakref
5711 list, for the same reason. */
5712 for (p
= &weakref_targets
; (t
= *p
) ; )
5714 if (DECL_ASSEMBLER_NAME (decl
)
5715 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5716 *p
= TREE_CHAIN (t
);
5718 p
= &TREE_CHAIN (t
);
5725 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5728 vec
<alias_pair
, va_gc
> *alias_pairs
;
5730 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5731 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5732 tree node is DECL to have the value of the tree node TARGET. */
5735 do_assemble_alias (tree decl
, tree target
)
5739 /* Emulated TLS had better not get this var. */
5740 gcc_assert (!(!targetm
.have_tls
5742 && DECL_THREAD_LOCAL_P (decl
)));
5744 if (TREE_ASM_WRITTEN (decl
))
5747 id
= DECL_ASSEMBLER_NAME (decl
);
5748 ultimate_transparent_alias_target (&id
);
5749 ultimate_transparent_alias_target (&target
);
5751 /* We must force creation of DECL_RTL for debug info generation, even though
5752 we don't use it here. */
5753 make_decl_rtl (decl
);
5755 TREE_ASM_WRITTEN (decl
) = 1;
5756 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5757 TREE_ASM_WRITTEN (id
) = 1;
5759 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5761 if (!TREE_SYMBOL_REFERENCED (target
))
5762 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5764 #ifdef ASM_OUTPUT_WEAKREF
5765 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5766 IDENTIFIER_POINTER (id
),
5767 IDENTIFIER_POINTER (target
));
5769 if (!TARGET_SUPPORTS_WEAK
)
5771 error_at (DECL_SOURCE_LOCATION (decl
),
5772 "weakref is not supported in this configuration");
5779 #ifdef ASM_OUTPUT_DEF
5780 tree orig_decl
= decl
;
5782 if (TREE_CODE (decl
) == FUNCTION_DECL
5783 && cgraph_node::get (decl
)->instrumentation_clone
5784 && cgraph_node::get (decl
)->instrumented_version
)
5785 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5787 /* Make name accessible from other files, if appropriate. */
5789 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5791 globalize_decl (decl
);
5792 maybe_assemble_visibility (decl
);
5794 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5796 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5797 if (targetm
.has_ifunc_p ())
5798 ASM_OUTPUT_TYPE_DIRECTIVE
5799 (asm_out_file
, IDENTIFIER_POINTER (id
),
5803 error_at (DECL_SOURCE_LOCATION (decl
),
5804 "ifunc is not supported on this target");
5807 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5808 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5810 ASM_OUTPUT_DEF (asm_out_file
,
5811 IDENTIFIER_POINTER (id
),
5812 IDENTIFIER_POINTER (target
));
5814 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5819 name
= IDENTIFIER_POINTER (id
);
5820 # ifdef ASM_WEAKEN_DECL
5821 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5823 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5825 /* Remove this function from the pending weak list so that
5826 we do not emit multiple .weak directives for it. */
5827 for (p
= &weak_decls
; (t
= *p
) ; )
5828 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5829 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5830 *p
= TREE_CHAIN (t
);
5832 p
= &TREE_CHAIN (t
);
5834 /* Remove weakrefs to the same target from the pending weakref
5835 list, for the same reason. */
5836 for (p
= &weakref_targets
; (t
= *p
) ; )
5838 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5839 *p
= TREE_CHAIN (t
);
5841 p
= &TREE_CHAIN (t
);
5847 /* Emit an assembler directive to make the symbol for DECL an alias to
5848 the symbol for TARGET. */
5851 assemble_alias (tree decl
, tree target
)
5855 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5857 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5859 ultimate_transparent_alias_target (&target
);
5861 if (alias
== target
)
5862 error ("weakref %q+D ultimately targets itself", decl
);
5863 if (TREE_PUBLIC (decl
))
5864 error ("weakref %q+D must have static linkage", decl
);
5868 #if !defined (ASM_OUTPUT_DEF)
5869 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5870 error_at (DECL_SOURCE_LOCATION (decl
),
5871 "alias definitions not supported in this configuration");
5872 TREE_ASM_WRITTEN (decl
) = 1;
5875 if (!DECL_WEAK (decl
))
5877 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5878 error_at (DECL_SOURCE_LOCATION (decl
),
5879 "ifunc is not supported in this configuration");
5881 error_at (DECL_SOURCE_LOCATION (decl
),
5882 "only weak aliases are supported in this configuration");
5883 TREE_ASM_WRITTEN (decl
) = 1;
5889 TREE_USED (decl
) = 1;
5891 /* Allow aliases to aliases. */
5892 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5893 cgraph_node::get_create (decl
)->alias
= true;
5895 varpool_node::get_create (decl
)->alias
= true;
5897 /* If the target has already been emitted, we don't have to queue the
5898 alias. This saves a tad of memory. */
5899 if (symtab
->global_info_ready
)
5900 target_decl
= find_decl (target
);
5903 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5904 || symtab
->state
>= EXPANSION
)
5905 do_assemble_alias (decl
, target
);
5908 alias_pair p
= {decl
, target
};
5909 vec_safe_push (alias_pairs
, p
);
5913 /* Record and output a table of translations from original function
5914 to its transaction aware clone. Note that tm_pure functions are
5915 considered to be their own clone. */
5917 struct tm_clone_hasher
: ggc_cache_ptr_hash
<tree_map
>
5919 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5920 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5923 keep_cache_entry (tree_map
*&e
)
5925 return ggc_marked_p (e
->base
.from
);
5929 static GTY((cache
)) hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5932 record_tm_clone_pair (tree o
, tree n
)
5934 struct tree_map
**slot
, *h
;
5936 if (tm_clone_hash
== NULL
)
5937 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5939 h
= ggc_alloc
<tree_map
> ();
5940 h
->hash
= htab_hash_pointer (o
);
5944 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5949 get_tm_clone_pair (tree o
)
5953 struct tree_map
*h
, in
;
5956 in
.hash
= htab_hash_pointer (o
);
5957 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5964 struct tm_alias_pair
5972 /* Dump the actual pairs to the .tm_clone_table section. */
5975 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5979 bool switched
= false;
5981 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5985 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5986 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5988 /* The function ipa_tm_create_version() marks the clone as needed if
5989 the original function was needed. But we also mark the clone as
5990 needed if we ever called the clone indirectly through
5991 TM_GETTMCLONE. If neither of these are true, we didn't generate
5992 a clone, and we didn't call it indirectly... no sense keeping it
5993 in the clone table. */
5994 if (!dst_n
|| !dst_n
->definition
)
5997 /* This covers the case where we have optimized the original
5998 function away, and only access the transactional clone. */
5999 if (!src_n
|| !src_n
->definition
)
6004 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
6005 assemble_align (POINTER_SIZE
);
6009 assemble_integer (XEXP (DECL_RTL (src
), 0),
6010 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6011 assemble_integer (XEXP (DECL_RTL (dst
), 0),
6012 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
6016 /* Provide a default for the tm_clone_table section. */
6019 default_clone_table_section (void)
6021 return get_named_section (NULL
, ".tm_clone_table", 3);
6024 /* Helper comparison function for qsorting by the DECL_UID stored in
6025 alias_pair->emitted_diags. */
6028 tm_alias_pair_cmp (const void *x
, const void *y
)
6030 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
6031 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
6032 if (p1
->uid
< p2
->uid
)
6034 if (p1
->uid
> p2
->uid
)
6040 finish_tm_clone_pairs (void)
6042 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
6044 if (tm_clone_hash
== NULL
)
6047 /* We need a determenistic order for the .tm_clone_table, otherwise
6048 we will get bootstrap comparison failures, so dump the hash table
6049 to a vector, sort it, and dump the vector. */
6051 /* Dump the hashtable to a vector. */
6053 hash_table
<tm_clone_hasher
>::iterator iter
;
6054 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
6056 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
6057 tm_alias_pairs
.safe_push (p
);
6060 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
6063 dump_tm_clone_pairs (tm_alias_pairs
);
6065 tm_clone_hash
->empty ();
6066 tm_clone_hash
= NULL
;
6067 tm_alias_pairs
.release ();
6071 /* Emit an assembler directive to set symbol for DECL visibility to
6072 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
6075 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
6076 int vis ATTRIBUTE_UNUSED
)
6078 #ifdef HAVE_GAS_HIDDEN
6079 static const char * const visibility_types
[] = {
6080 NULL
, "protected", "hidden", "internal"
6083 const char *name
, *type
;
6086 id
= DECL_ASSEMBLER_NAME (decl
);
6087 ultimate_transparent_alias_target (&id
);
6088 name
= IDENTIFIER_POINTER (id
);
6090 type
= visibility_types
[vis
];
6092 fprintf (asm_out_file
, "\t.%s\t", type
);
6093 assemble_name (asm_out_file
, name
);
6094 fprintf (asm_out_file
, "\n");
6096 if (!DECL_ARTIFICIAL (decl
))
6097 warning (OPT_Wattributes
, "visibility attribute not supported "
6098 "in this configuration; ignored");
6102 /* A helper function to call assemble_visibility when needed for a decl. */
6105 maybe_assemble_visibility (tree decl
)
6107 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
6109 if (TREE_CODE (decl
) == FUNCTION_DECL
6110 && cgraph_node::get (decl
)
6111 && cgraph_node::get (decl
)->instrumentation_clone
6112 && cgraph_node::get (decl
)->instrumented_version
)
6113 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
6115 if (vis
!= VISIBILITY_DEFAULT
)
6117 targetm
.asm_out
.assemble_visibility (decl
, vis
);
6124 /* Returns 1 if the target configuration supports defining public symbols
6125 so that one of them will be chosen at link time instead of generating a
6126 multiply-defined symbol error, whether through the use of weak symbols or
6127 a target-specific mechanism for having duplicates discarded. */
6130 supports_one_only (void)
6132 if (SUPPORTS_ONE_ONLY
)
6134 return TARGET_SUPPORTS_WEAK
;
6137 /* Set up DECL as a public symbol that can be defined in multiple
6138 translation units without generating a linker error. */
6141 make_decl_one_only (tree decl
, tree comdat_group
)
6143 struct symtab_node
*symbol
;
6144 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl
));
6146 TREE_PUBLIC (decl
) = 1;
6149 symbol
= varpool_node::get_create (decl
);
6151 symbol
= cgraph_node::get_create (decl
);
6153 if (SUPPORTS_ONE_ONLY
)
6155 #ifdef MAKE_DECL_ONE_ONLY
6156 MAKE_DECL_ONE_ONLY (decl
);
6158 symbol
->set_comdat_group (comdat_group
);
6160 else if (VAR_P (decl
)
6161 && (DECL_INITIAL (decl
) == 0
6162 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6163 DECL_COMMON (decl
) = 1;
6166 gcc_assert (TARGET_SUPPORTS_WEAK
);
6167 DECL_WEAK (decl
) = 1;
6172 init_varasm_once (void)
6174 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6175 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6176 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6178 shared_constant_pool
= create_constant_pool ();
6180 #ifdef TEXT_SECTION_ASM_OP
6181 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6182 TEXT_SECTION_ASM_OP
);
6185 #ifdef DATA_SECTION_ASM_OP
6186 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6187 DATA_SECTION_ASM_OP
);
6190 #ifdef SDATA_SECTION_ASM_OP
6191 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6192 SDATA_SECTION_ASM_OP
);
6195 #ifdef READONLY_DATA_SECTION_ASM_OP
6196 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6197 READONLY_DATA_SECTION_ASM_OP
);
6200 #ifdef CTORS_SECTION_ASM_OP
6201 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6202 CTORS_SECTION_ASM_OP
);
6205 #ifdef DTORS_SECTION_ASM_OP
6206 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6207 DTORS_SECTION_ASM_OP
);
6210 #ifdef BSS_SECTION_ASM_OP
6211 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6212 output_section_asm_op
,
6213 BSS_SECTION_ASM_OP
);
6216 #ifdef SBSS_SECTION_ASM_OP
6217 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6218 output_section_asm_op
,
6219 SBSS_SECTION_ASM_OP
);
6222 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6223 | SECTION_COMMON
, emit_tls_common
);
6224 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6225 | SECTION_COMMON
, emit_local
);
6226 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6227 | SECTION_COMMON
, emit_common
);
6229 #if defined ASM_OUTPUT_ALIGNED_BSS
6230 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6234 targetm
.asm_out
.init_sections ();
6236 if (readonly_data_section
== NULL
)
6237 readonly_data_section
= text_section
;
6239 #ifdef ASM_OUTPUT_EXTERNAL
6240 pending_assemble_externals_set
= new hash_set
<tree
>;
6245 decl_default_tls_model (const_tree decl
)
6247 enum tls_model kind
;
6250 is_local
= targetm
.binds_local_p (decl
);
6254 kind
= TLS_MODEL_LOCAL_EXEC
;
6256 kind
= TLS_MODEL_INITIAL_EXEC
;
6259 /* Local dynamic is inefficient when we're not combining the
6260 parts of the address. */
6261 else if (optimize
&& is_local
)
6262 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6264 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6265 if (kind
< flag_tls_default
)
6266 kind
= flag_tls_default
;
6271 /* Select a set of attributes for section NAME based on the properties
6272 of DECL and whether or not RELOC indicates that DECL's initializer
6273 might contain runtime relocations.
6275 We make the section read-only and executable for a function decl,
6276 read-only for a const data decl, and writable for a non-const data decl. */
6279 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6283 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6284 flags
= SECTION_CODE
;
6287 enum section_category category
6288 = categorize_decl_for_section (decl
, reloc
);
6289 if (decl_readonly_section_1 (category
))
6291 else if (category
== SECCAT_DATA_REL_RO
6292 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6293 flags
= SECTION_WRITE
| SECTION_RELRO
;
6295 flags
= SECTION_WRITE
;
6299 flags
= SECTION_WRITE
;
6300 if (strcmp (name
, ".data.rel.ro") == 0
6301 || strcmp (name
, ".data.rel.ro.local") == 0)
6302 flags
|= SECTION_RELRO
;
6305 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6306 flags
|= SECTION_LINKONCE
;
6308 if (strcmp (name
, ".vtable_map_vars") == 0)
6309 flags
|= SECTION_LINKONCE
;
6311 if (decl
&& VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6312 flags
|= SECTION_TLS
| SECTION_WRITE
;
6314 if (strcmp (name
, ".bss") == 0
6315 || strncmp (name
, ".bss.", 5) == 0
6316 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6317 || strcmp (name
, ".persistent.bss") == 0
6318 || strcmp (name
, ".sbss") == 0
6319 || strncmp (name
, ".sbss.", 6) == 0
6320 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6321 flags
|= SECTION_BSS
;
6323 if (strcmp (name
, ".tdata") == 0
6324 || strncmp (name
, ".tdata.", 7) == 0
6325 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6326 flags
|= SECTION_TLS
;
6328 if (strcmp (name
, ".tbss") == 0
6329 || strncmp (name
, ".tbss.", 6) == 0
6330 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6331 flags
|= SECTION_TLS
| SECTION_BSS
;
6333 /* These three sections have special ELF types. They are neither
6334 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6335 want to print a section type (@progbits or @nobits). If someone
6336 is silly enough to emit code or TLS variables to one of these
6337 sections, then don't handle them specially. */
6338 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6339 && (strcmp (name
, ".init_array") == 0
6340 || strcmp (name
, ".fini_array") == 0
6341 || strcmp (name
, ".preinit_array") == 0))
6342 flags
|= SECTION_NOTYPE
;
6347 /* Return true if the target supports some form of global BSS,
6348 either through bss_noswitch_section, or by selecting a BSS
6349 section in TARGET_ASM_SELECT_SECTION. */
6352 have_global_bss_p (void)
6354 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6357 /* Output assembly to switch to section NAME with attribute FLAGS.
6358 Four variants for common object file formats. */
6361 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6362 unsigned int flags ATTRIBUTE_UNUSED
,
6363 tree decl ATTRIBUTE_UNUSED
)
6365 /* Some object formats don't support named sections at all. The
6366 front-end should already have flagged this as an error. */
6370 #ifndef TLS_SECTION_ASM_FLAG
6371 #define TLS_SECTION_ASM_FLAG 'T'
6375 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6378 char flagchars
[11], *f
= flagchars
;
6379 unsigned int numeric_value
= 0;
6381 /* If we have already declared this section, we can use an
6382 abbreviated form to switch back to it -- unless this section is
6383 part of a COMDAT groups, in which case GAS requires the full
6384 declaration every time. */
6385 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6386 && (flags
& SECTION_DECLARED
))
6388 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6392 /* If we have a machine specific flag, then use the numeric value to pass
6394 if (targetm
.asm_out
.elf_flags_numeric (flags
, &numeric_value
))
6395 snprintf (f
, sizeof (flagchars
), "0x%08x", numeric_value
);
6398 if (!(flags
& SECTION_DEBUG
))
6400 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6401 if (flags
& SECTION_EXCLUDE
)
6404 if (flags
& SECTION_WRITE
)
6406 if (flags
& SECTION_CODE
)
6408 if (flags
& SECTION_SMALL
)
6410 if (flags
& SECTION_MERGE
)
6412 if (flags
& SECTION_STRINGS
)
6414 if (flags
& SECTION_TLS
)
6415 *f
++ = TLS_SECTION_ASM_FLAG
;
6416 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6418 #ifdef MACH_DEP_SECTION_ASM_FLAG
6419 if (flags
& SECTION_MACH_DEP
)
6420 *f
++ = MACH_DEP_SECTION_ASM_FLAG
;
6425 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6427 if (!(flags
& SECTION_NOTYPE
))
6432 if (flags
& SECTION_BSS
)
6438 /* On platforms that use "@" as the assembly comment character,
6440 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6442 fprintf (asm_out_file
, format
, type
);
6444 if (flags
& SECTION_ENTSIZE
)
6445 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6446 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6448 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6449 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6451 fprintf (asm_out_file
, ",%s,comdat",
6452 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6456 putc ('\n', asm_out_file
);
6460 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6461 tree decl ATTRIBUTE_UNUSED
)
6463 char flagchars
[8], *f
= flagchars
;
6465 if (flags
& SECTION_WRITE
)
6467 if (flags
& SECTION_CODE
)
6471 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6475 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6478 default_coff_asm_named_section (name
, flags
, decl
);
6480 if (flags
& SECTION_LINKONCE
)
6482 /* Functions may have been compiled at various levels of
6483 optimization so we can't use `same_size' here.
6484 Instead, have the linker pick one. */
6485 fprintf (asm_out_file
, "\t.linkonce %s\n",
6486 (flags
& SECTION_CODE
? "discard" : "same_size"));
6490 /* The lame default section selector. */
6493 default_select_section (tree decl
, int reloc
,
6494 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6498 if (decl_readonly_section (decl
, reloc
))
6499 return readonly_data_section
;
6501 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6503 if (! ((flag_pic
&& reloc
)
6504 || !TREE_READONLY (decl
)
6505 || TREE_SIDE_EFFECTS (decl
)
6506 || !TREE_CONSTANT (decl
)))
6507 return readonly_data_section
;
6509 else if (TREE_CODE (decl
) == STRING_CST
)
6510 return readonly_data_section
;
6511 else if (! (flag_pic
&& reloc
))
6512 return readonly_data_section
;
6514 return data_section
;
6517 enum section_category
6518 categorize_decl_for_section (const_tree decl
, int reloc
)
6520 enum section_category ret
;
6522 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6524 else if (TREE_CODE (decl
) == STRING_CST
)
6526 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6527 && asan_protect_global (CONST_CAST_TREE (decl
)))
6528 /* or !flag_merge_constants */
6529 return SECCAT_RODATA
;
6531 return SECCAT_RODATA_MERGE_STR
;
6533 else if (VAR_P (decl
))
6535 tree d
= CONST_CAST_TREE (decl
);
6536 if (bss_initializer_p (decl
))
6538 else if (! TREE_READONLY (decl
)
6539 || TREE_SIDE_EFFECTS (decl
)
6540 || (DECL_INITIAL (decl
)
6541 && ! TREE_CONSTANT (DECL_INITIAL (decl
))))
6543 /* Here the reloc_rw_mask is not testing whether the section should
6544 be read-only or not, but whether the dynamic link will have to
6545 do something. If so, we wish to segregate the data in order to
6546 minimize cache misses inside the dynamic linker. */
6547 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6548 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6552 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6553 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6554 else if (reloc
|| flag_merge_constants
< 2
6555 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6556 /* PR 81697: for architectures that use section anchors we
6557 need to ignore DECL_RTL_SET_P (decl) for string constants
6558 inside this asan_protect_global call because otherwise
6559 we'll wrongly put them into SECCAT_RODATA_MERGE_CONST
6560 section, set DECL_RTL (decl) later on and add DECL to
6561 protected globals via successive asan_protect_global
6562 calls. In this scenario we'll end up with wrong
6563 alignment of these strings at runtime and possible ASan
6565 && asan_protect_global (d
, use_object_blocks_p ()
6566 && use_blocks_for_decl_p (d
))))
6567 /* C and C++ don't allow different variables to share the same
6568 location. -fmerge-all-constants allows even that (at the
6569 expense of not conforming). */
6570 ret
= SECCAT_RODATA
;
6571 else if (DECL_INITIAL (decl
)
6572 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6573 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6575 ret
= SECCAT_RODATA_MERGE_CONST
;
6577 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6579 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6580 || TREE_SIDE_EFFECTS (decl
)
6581 || ! TREE_CONSTANT (decl
))
6584 ret
= SECCAT_RODATA
;
6587 ret
= SECCAT_RODATA
;
6589 /* There are no read-only thread-local sections. */
6590 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6592 /* Note that this would be *just* SECCAT_BSS, except that there's
6593 no concept of a read-only thread-local-data section. */
6594 if (ret
== SECCAT_BSS
6595 || DECL_INITIAL (decl
) == NULL
6596 || (flag_zero_initialized_in_bss
6597 && initializer_zerop (DECL_INITIAL (decl
))))
6603 /* If the target uses small data sections, select it. */
6604 else if (targetm
.in_small_data_p (decl
))
6606 if (ret
== SECCAT_BSS
)
6608 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6609 ret
= SECCAT_SRODATA
;
6618 decl_readonly_section_1 (enum section_category category
)
6623 case SECCAT_RODATA_MERGE_STR
:
6624 case SECCAT_RODATA_MERGE_STR_INIT
:
6625 case SECCAT_RODATA_MERGE_CONST
:
6626 case SECCAT_SRODATA
:
6634 decl_readonly_section (const_tree decl
, int reloc
)
6636 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6639 /* Select a section based on the above categorization. */
6642 default_elf_select_section (tree decl
, int reloc
,
6643 unsigned HOST_WIDE_INT align
)
6646 switch (categorize_decl_for_section (decl
, reloc
))
6649 /* We're not supposed to be called on FUNCTION_DECLs. */
6652 return readonly_data_section
;
6653 case SECCAT_RODATA_MERGE_STR
:
6654 return mergeable_string_section (decl
, align
, 0);
6655 case SECCAT_RODATA_MERGE_STR_INIT
:
6656 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6657 case SECCAT_RODATA_MERGE_CONST
:
6658 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6659 case SECCAT_SRODATA
:
6663 return data_section
;
6664 case SECCAT_DATA_REL
:
6665 sname
= ".data.rel";
6667 case SECCAT_DATA_REL_LOCAL
:
6668 sname
= ".data.rel.local";
6670 case SECCAT_DATA_REL_RO
:
6671 sname
= ".data.rel.ro";
6673 case SECCAT_DATA_REL_RO_LOCAL
:
6674 sname
= ".data.rel.ro.local";
6697 return get_named_section (decl
, sname
, reloc
);
6700 /* Construct a unique section name based on the decl name and the
6701 categorization performed above. */
6704 default_unique_section (tree decl
, int reloc
)
6706 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6707 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6708 const char *prefix
, *name
, *linkonce
;
6712 switch (categorize_decl_for_section (decl
, reloc
))
6715 prefix
= one_only
? ".t" : ".text";
6718 case SECCAT_RODATA_MERGE_STR
:
6719 case SECCAT_RODATA_MERGE_STR_INIT
:
6720 case SECCAT_RODATA_MERGE_CONST
:
6721 prefix
= one_only
? ".r" : ".rodata";
6723 case SECCAT_SRODATA
:
6724 prefix
= one_only
? ".s2" : ".sdata2";
6727 prefix
= one_only
? ".d" : ".data";
6729 case SECCAT_DATA_REL
:
6730 prefix
= one_only
? ".d.rel" : ".data.rel";
6732 case SECCAT_DATA_REL_LOCAL
:
6733 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6735 case SECCAT_DATA_REL_RO
:
6736 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6738 case SECCAT_DATA_REL_RO_LOCAL
:
6739 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6742 prefix
= one_only
? ".s" : ".sdata";
6745 prefix
= one_only
? ".b" : ".bss";
6748 prefix
= one_only
? ".sb" : ".sbss";
6751 prefix
= one_only
? ".td" : ".tdata";
6754 prefix
= one_only
? ".tb" : ".tbss";
6760 id
= DECL_ASSEMBLER_NAME (decl
);
6761 ultimate_transparent_alias_target (&id
);
6762 name
= IDENTIFIER_POINTER (id
);
6763 name
= targetm
.strip_name_encoding (name
);
6765 /* If we're using one_only, then there needs to be a .gnu.linkonce
6766 prefix to the section name. */
6767 linkonce
= one_only
? ".gnu.linkonce" : "";
6769 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6771 set_decl_section_name (decl
, string
);
6774 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6777 compute_reloc_for_rtx_1 (const_rtx x
)
6779 switch (GET_CODE (x
))
6782 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6790 /* Like compute_reloc_for_constant, except for an RTX. The return value
6791 is a mask for which bit 1 indicates a global relocation, and bit 0
6792 indicates a local relocation. */
6795 compute_reloc_for_rtx (const_rtx x
)
6797 switch (GET_CODE (x
))
6801 return compute_reloc_for_rtx_1 (x
);
6806 subrtx_iterator::array_type array
;
6807 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6808 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6818 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6820 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6822 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6823 return data_section
;
6825 return readonly_data_section
;
6829 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6830 unsigned HOST_WIDE_INT align
)
6832 int reloc
= compute_reloc_for_rtx (x
);
6834 /* ??? Handle small data here somehow. */
6836 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6839 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6841 return get_named_section (NULL
, ".data.rel.ro", 3);
6844 return mergeable_constant_section (mode
, align
, 0);
6847 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6850 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6855 /* Careful not to prod global register variables. */
6858 symbol
= XEXP (rtl
, 0);
6859 if (GET_CODE (symbol
) != SYMBOL_REF
)
6862 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6863 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6864 flags
|= SYMBOL_FLAG_FUNCTION
;
6865 if (targetm
.binds_local_p (decl
))
6866 flags
|= SYMBOL_FLAG_LOCAL
;
6867 if (VAR_P (decl
) && DECL_THREAD_LOCAL_P (decl
))
6868 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6869 else if (targetm
.in_small_data_p (decl
))
6870 flags
|= SYMBOL_FLAG_SMALL
;
6871 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6872 being PUBLIC, the thing *must* be defined in this translation unit.
6873 Prevent this buglet from being propagated into rtl code as well. */
6874 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6875 flags
|= SYMBOL_FLAG_EXTERNAL
;
6877 SYMBOL_REF_FLAGS (symbol
) = flags
;
6880 /* By default, we do nothing for encode_section_info, so we need not
6881 do anything but discard the '*' marker. */
6884 default_strip_name_encoding (const char *str
)
6886 return str
+ (*str
== '*');
6889 #ifdef ASM_OUTPUT_DEF
6890 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6891 anchor relative to ".", the current section position. */
6894 default_asm_output_anchor (rtx symbol
)
6898 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6899 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6900 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6904 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6907 default_use_anchors_for_symbol_p (const_rtx symbol
)
6912 /* Don't use anchors for mergeable sections. The linker might move
6913 the objects around. */
6914 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6915 if (sect
->common
.flags
& SECTION_MERGE
)
6918 /* Don't use anchors for small data sections. The small data register
6919 acts as an anchor for such sections. */
6920 if (sect
->common
.flags
& SECTION_SMALL
)
6923 decl
= SYMBOL_REF_DECL (symbol
);
6924 if (decl
&& DECL_P (decl
))
6926 /* Don't use section anchors for decls that might be defined or
6927 usurped by other modules. */
6928 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6931 /* Don't use section anchors for decls that will be placed in a
6932 small data section. */
6933 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6934 one above. The problem is that we only use SECTION_SMALL for
6935 sections that should be marked as small in the section directive. */
6936 if (targetm
.in_small_data_p (decl
))
6939 /* Don't use section anchors for decls that won't fit inside a single
6940 anchor range to reduce the amount of instructions required to refer
6941 to the entire declaration. */
6942 if (DECL_SIZE_UNIT (decl
) == NULL_TREE
6943 || !tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
))
6944 || (tree_to_uhwi (DECL_SIZE_UNIT (decl
))
6945 >= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
))
6952 /* Return true when RESOLUTION indicate that symbol will be bound to the
6953 definition provided by current .o file. */
6956 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6958 return (resolution
== LDPR_PREVAILING_DEF
6959 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6960 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6963 /* Return true when RESOLUTION indicate that symbol will be bound locally
6964 within current executable or DSO. */
6967 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6969 return (resolution
== LDPR_PREVAILING_DEF
6970 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6971 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6972 || resolution
== LDPR_PREEMPTED_REG
6973 || resolution
== LDPR_PREEMPTED_IR
6974 || resolution
== LDPR_RESOLVED_IR
6975 || resolution
== LDPR_RESOLVED_EXEC
);
6978 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6979 uninitialized common symbol in the executable will still be defined
6980 (through COPY relocation) in the executable. */
6983 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
6984 bool extern_protected_data
, bool common_local_p
)
6986 /* A non-decl is an entry in the constant pool. */
6990 /* Weakrefs may not bind locally, even though the weakref itself is always
6991 static and therefore local. Similarly, the resolver for ifunc functions
6992 might resolve to a non-local function.
6993 FIXME: We can resolve the weakref case more curefuly by looking at the
6995 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6996 || (TREE_CODE (exp
) == FUNCTION_DECL
6997 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
7000 /* Static variables are always local. */
7001 if (! TREE_PUBLIC (exp
))
7004 /* With resolution file in hand, take look into resolutions.
7005 We can't just return true for resolved_locally symbols,
7006 because dynamic linking might overwrite symbols
7007 in shared libraries. */
7008 bool resolved_locally
= false;
7010 bool uninited_common
= (DECL_COMMON (exp
)
7011 && (DECL_INITIAL (exp
) == NULL
7013 && DECL_INITIAL (exp
) == error_mark_node
)));
7015 /* A non-external variable is defined locally only if it isn't
7016 uninitialized COMMON variable or common_local_p is true. */
7017 bool defined_locally
= (!DECL_EXTERNAL (exp
)
7018 && (!uninited_common
|| common_local_p
));
7019 if (symtab_node
*node
= symtab_node::get (exp
))
7021 if (node
->in_other_partition
)
7022 defined_locally
= true;
7023 if (node
->can_be_discarded_p ())
7025 else if (resolution_to_local_definition_p (node
->resolution
))
7026 defined_locally
= resolved_locally
= true;
7027 else if (resolution_local_p (node
->resolution
))
7028 resolved_locally
= true;
7030 if (defined_locally
&& weak_dominate
&& !shlib
)
7031 resolved_locally
= true;
7033 /* Undefined weak symbols are never defined locally. */
7034 if (DECL_WEAK (exp
) && !defined_locally
)
7037 /* A symbol is local if the user has said explicitly that it will be,
7038 or if we have a definition for the symbol. We cannot infer visibility
7039 for undefined symbols. */
7040 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
7041 && (TREE_CODE (exp
) == FUNCTION_DECL
7042 || !extern_protected_data
7043 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
7044 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
7047 /* If PIC, then assume that any global name can be overridden by
7048 symbols resolved from other modules. */
7052 /* Variables defined outside this object might not be local. */
7053 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
7056 /* Non-dominant weak symbols are not defined locally. */
7057 if (DECL_WEAK (exp
) && !resolved_locally
)
7060 /* Uninitialized COMMON variable may be unified with symbols
7061 resolved from other modules. */
7062 if (uninited_common
&& !resolved_locally
)
7065 /* Otherwise we're left with initialized (or non-common) global data
7066 which is of necessity defined locally. */
7070 /* Assume ELF-ish defaults, since that's pretty much the most liberal
7071 wrt cross-module name binding. */
7074 default_binds_local_p (const_tree exp
)
7076 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
7079 /* Similar to default_binds_local_p, but common symbol may be local and
7080 extern protected data is non-local. */
7083 default_binds_local_p_2 (const_tree exp
)
7085 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, true,
7090 default_binds_local_p_1 (const_tree exp
, int shlib
)
7092 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
7095 /* Return true when references to DECL must bind to current definition in
7098 The condition is usually equivalent to whether the function binds to the
7099 current module (shared library or executable), that is to binds_local_p.
7100 We use this fact to avoid need for another target hook and implement
7101 the logic using binds_local_p and just special cases where
7102 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
7103 the weak definitions (that can be overwritten at linktime by other
7104 definition from different object file) and when resolution info is available
7105 we simply use the knowledge passed to us by linker plugin. */
7107 decl_binds_to_current_def_p (const_tree decl
)
7109 gcc_assert (DECL_P (decl
));
7110 if (!targetm
.binds_local_p (decl
))
7112 if (!TREE_PUBLIC (decl
))
7115 /* When resolution is available, just use it. */
7116 if (symtab_node
*node
= symtab_node::get (decl
))
7118 if (node
->resolution
!= LDPR_UNKNOWN
7119 && !node
->can_be_discarded_p ())
7120 return resolution_to_local_definition_p (node
->resolution
);
7123 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
7124 binds locally but still can be overwritten), DECL_COMMON (can be merged
7125 with a non-common definition somewhere in the same module) or
7127 This rely on fact that binds_local_p behave as decl_replaceable_p
7128 for all other declaration types. */
7129 if (DECL_WEAK (decl
))
7131 if (DECL_COMMON (decl
)
7132 && (DECL_INITIAL (decl
) == NULL
7133 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
7135 if (DECL_EXTERNAL (decl
))
7140 /* A replaceable function or variable is one which may be replaced
7141 at link-time with an entirely different definition, provided that the
7142 replacement has the same type. For example, functions declared
7143 with __attribute__((weak)) on most systems are replaceable.
7145 COMDAT functions are not replaceable, since all definitions of the
7146 function must be equivalent. It is important that COMDAT functions
7147 not be treated as replaceable so that use of C++ template
7148 instantiations is not penalized. */
7151 decl_replaceable_p (tree decl
)
7153 gcc_assert (DECL_P (decl
));
7154 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
7156 if (!flag_semantic_interposition
7157 && !DECL_WEAK (decl
))
7159 return !decl_binds_to_current_def_p (decl
);
7162 /* Default function to output code that will globalize a label. A
7163 target must define GLOBAL_ASM_OP or provide its own function to
7164 globalize a label. */
7165 #ifdef GLOBAL_ASM_OP
7167 default_globalize_label (FILE * stream
, const char *name
)
7169 fputs (GLOBAL_ASM_OP
, stream
);
7170 assemble_name (stream
, name
);
7171 putc ('\n', stream
);
7173 #endif /* GLOBAL_ASM_OP */
7175 /* Default function to output code that will globalize a declaration. */
7177 default_globalize_decl_name (FILE * stream
, tree decl
)
7179 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7180 targetm
.asm_out
.globalize_label (stream
, name
);
7183 /* Default function to output a label for unwind information. The
7184 default is to do nothing. A target that needs nonlocal labels for
7185 unwind information must provide its own function to do this. */
7187 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7188 tree decl ATTRIBUTE_UNUSED
,
7189 int for_eh ATTRIBUTE_UNUSED
,
7190 int empty ATTRIBUTE_UNUSED
)
7194 /* Default function to output a label to divide up the exception table.
7195 The default is to do nothing. A target that needs/wants to divide
7196 up the table must provide it's own function to do this. */
7198 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7202 /* This is how to output an internal numbered label where PREFIX is
7203 the class of label and LABELNO is the number within the class. */
7206 default_generate_internal_label (char *buf
, const char *prefix
,
7207 unsigned long labelno
)
7209 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7212 /* This is how to output an internal numbered label where PREFIX is
7213 the class of label and LABELNO is the number within the class. */
7216 default_internal_label (FILE *stream
, const char *prefix
,
7217 unsigned long labelno
)
7219 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7220 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7221 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7225 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7228 default_asm_declare_constant_name (FILE *file
, const char *name
,
7229 const_tree exp ATTRIBUTE_UNUSED
,
7230 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7232 assemble_label (file
, name
);
7235 /* This is the default behavior at the beginning of a file. It's
7236 controlled by two other target-hook toggles. */
7238 default_file_start (void)
7240 if (targetm
.asm_file_start_app_off
7241 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7242 fputs (ASM_APP_OFF
, asm_out_file
);
7244 if (targetm
.asm_file_start_file_directive
)
7246 /* LTO produced units have no meaningful main_input_filename. */
7248 output_file_directive (asm_out_file
, "<artificial>");
7250 output_file_directive (asm_out_file
, main_input_filename
);
7254 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7255 which emits a special section directive used to indicate whether or
7256 not this object file needs an executable stack. This is primarily
7257 a GNU extension to ELF but could be used on other targets. */
7259 int trampolines_created
;
7262 file_end_indicate_exec_stack (void)
7264 unsigned int flags
= SECTION_DEBUG
;
7265 if (trampolines_created
)
7266 flags
|= SECTION_CODE
;
7268 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7271 /* Emit a special section directive to indicate that this object file
7272 was compiled with -fsplit-stack. This is used to let the linker
7273 detect calls between split-stack code and non-split-stack code, so
7274 that it can modify the split-stack code to allocate a sufficiently
7275 large stack. We emit another special section if there are any
7276 functions in this file which have the no_split_stack attribute, to
7277 prevent the linker from warning about being unable to convert the
7278 functions if they call non-split-stack code. */
7281 file_end_indicate_split_stack (void)
7283 if (flag_split_stack
)
7285 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7287 if (saw_no_split_stack
)
7288 switch_to_section (get_section (".note.GNU-no-split-stack",
7289 SECTION_DEBUG
, NULL
));
7293 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7294 a get_unnamed_section callback. */
7297 output_section_asm_op (const void *directive
)
7299 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7302 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7303 the current section is NEW_SECTION. */
7306 switch_to_section (section
*new_section
)
7308 if (in_section
== new_section
)
7311 if (new_section
->common
.flags
& SECTION_FORGET
)
7314 in_section
= new_section
;
7316 switch (SECTION_STYLE (new_section
))
7319 targetm
.asm_out
.named_section (new_section
->named
.name
,
7320 new_section
->named
.common
.flags
,
7321 new_section
->named
.decl
);
7324 case SECTION_UNNAMED
:
7325 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7328 case SECTION_NOSWITCH
:
7333 new_section
->common
.flags
|= SECTION_DECLARED
;
7336 /* If block symbol SYMBOL has not yet been assigned an offset, place
7337 it at the end of its block. */
7340 place_block_symbol (rtx symbol
)
7342 unsigned HOST_WIDE_INT size
, mask
, offset
;
7343 struct constant_descriptor_rtx
*desc
;
7344 unsigned int alignment
;
7345 struct object_block
*block
;
7348 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7349 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7352 /* Work out the symbol's size and alignment. */
7353 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7355 desc
= SYMBOL_REF_CONSTANT (symbol
);
7356 alignment
= desc
->align
;
7357 size
= GET_MODE_SIZE (desc
->mode
);
7359 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7361 decl
= SYMBOL_REF_DECL (symbol
);
7362 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7363 alignment
= DECL_ALIGN (decl
);
7364 size
= get_constant_size (DECL_INITIAL (decl
));
7365 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7366 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7367 && asan_protect_global (DECL_INITIAL (decl
)))
7369 size
+= asan_red_zone_size (size
);
7370 alignment
= MAX (alignment
,
7371 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7376 struct symtab_node
*snode
;
7377 decl
= SYMBOL_REF_DECL (symbol
);
7379 snode
= symtab_node::get (decl
);
7382 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7384 gcc_assert (MEM_P (target
)
7385 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7386 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7387 target
= XEXP (target
, 0);
7388 place_block_symbol (target
);
7389 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7392 alignment
= get_variable_align (decl
);
7393 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7394 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7395 && asan_protect_global (decl
))
7397 size
+= asan_red_zone_size (size
);
7398 alignment
= MAX (alignment
,
7399 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7403 /* Calculate the object's offset from the start of the block. */
7404 block
= SYMBOL_REF_BLOCK (symbol
);
7405 mask
= alignment
/ BITS_PER_UNIT
- 1;
7406 offset
= (block
->size
+ mask
) & ~mask
;
7407 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7409 /* Record the block's new alignment and size. */
7410 block
->alignment
= MAX (block
->alignment
, alignment
);
7411 block
->size
= offset
+ size
;
7413 vec_safe_push (block
->objects
, symbol
);
7416 /* Return the anchor that should be used to address byte offset OFFSET
7417 from the first object in BLOCK. MODEL is the TLS model used
7421 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7422 enum tls_model model
)
7425 unsigned int begin
, middle
, end
;
7426 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7429 /* Work out the anchor's offset. Use an offset of 0 for the first
7430 anchor so that we don't pessimize the case where we take the address
7431 of a variable at the beginning of the block. This is particularly
7432 useful when a block has only one variable assigned to it.
7434 We try to place anchors RANGE bytes apart, so there can then be
7435 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7436 a ptr_mode offset. With some target settings, the lowest such
7437 anchor might be out of range for the lowest ptr_mode offset;
7438 likewise the highest anchor for the highest offset. Use anchors
7439 at the extreme ends of the ptr_mode range in such cases.
7441 All arithmetic uses unsigned integers in order to avoid
7443 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7444 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7445 range
= max_offset
- min_offset
+ 1;
7450 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7453 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7454 delta
-= delta
% range
;
7457 offset
= (HOST_WIDE_INT
) (-delta
);
7461 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7462 delta
-= delta
% range
;
7463 if (delta
> bias
- 1)
7465 offset
= (HOST_WIDE_INT
) delta
;
7469 /* Do a binary search to see if there's already an anchor we can use.
7470 Set BEGIN to the new anchor's index if not. */
7472 end
= vec_safe_length (block
->anchors
);
7473 while (begin
!= end
)
7475 middle
= (end
+ begin
) / 2;
7476 anchor
= (*block
->anchors
)[middle
];
7477 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7479 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7481 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7483 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7489 /* Create a new anchor with a unique label. */
7490 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7491 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7492 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7493 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7495 /* Insert it at index BEGIN. */
7496 vec_safe_insert (block
->anchors
, begin
, anchor
);
7500 /* Output the objects in BLOCK. */
7503 output_object_block (struct object_block
*block
)
7505 struct constant_descriptor_rtx
*desc
;
7507 HOST_WIDE_INT offset
;
7511 if (!block
->objects
)
7514 /* Switch to the section and make sure that the first byte is
7515 suitably aligned. */
7516 /* Special case VTV comdat sections similar to assemble_variable. */
7517 if (SECTION_STYLE (block
->sect
) == SECTION_NAMED
7518 && block
->sect
->named
.name
7519 && (strcmp (block
->sect
->named
.name
, ".vtable_map_vars") == 0))
7520 handle_vtv_comdat_section (block
->sect
, block
->sect
->named
.decl
);
7522 switch_to_section (block
->sect
);
7524 assemble_align (block
->alignment
);
7526 /* Define the values of all anchors relative to the current section
7528 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7529 targetm
.asm_out
.output_anchor (symbol
);
7531 /* Output the objects themselves. */
7533 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7535 /* Move to the object's offset, padding with zeros if necessary. */
7536 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7537 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7538 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7540 desc
= SYMBOL_REF_CONSTANT (symbol
);
7541 /* Pass 1 for align as we have already laid out everything in the block.
7542 So aligning shouldn't be necessary. */
7543 output_constant_pool_1 (desc
, 1);
7544 offset
+= GET_MODE_SIZE (desc
->mode
);
7546 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7549 decl
= SYMBOL_REF_DECL (symbol
);
7550 assemble_constant_contents
7551 (DECL_INITIAL (decl
), XSTR (symbol
, 0), DECL_ALIGN (decl
));
7553 size
= get_constant_size (DECL_INITIAL (decl
));
7555 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7556 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7557 && asan_protect_global (DECL_INITIAL (decl
)))
7559 size
= asan_red_zone_size (size
);
7560 assemble_zeros (size
);
7567 decl
= SYMBOL_REF_DECL (symbol
);
7568 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7569 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7571 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7572 && asan_protect_global (decl
))
7574 size
= asan_red_zone_size (size
);
7575 assemble_zeros (size
);
7582 /* A callback for qsort to compare object_blocks. */
7585 output_object_block_compare (const void *x
, const void *y
)
7587 object_block
*p1
= *(object_block
* const*)x
;
7588 object_block
*p2
= *(object_block
* const*)y
;
7590 if (p1
->sect
->common
.flags
& SECTION_NAMED
7591 && !(p2
->sect
->common
.flags
& SECTION_NAMED
))
7594 if (!(p1
->sect
->common
.flags
& SECTION_NAMED
)
7595 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7598 if (p1
->sect
->common
.flags
& SECTION_NAMED
7599 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7600 return strcmp (p1
->sect
->named
.name
, p2
->sect
->named
.name
);
7602 unsigned f1
= p1
->sect
->common
.flags
;
7603 unsigned f2
= p2
->sect
->common
.flags
;
7606 return f1
< f2
? -1 : 1;
7609 /* Output the definitions of all object_blocks. */
7612 output_object_blocks (void)
7614 vec
<object_block
*, va_heap
> v
;
7615 v
.create (object_block_htab
->elements ());
7617 hash_table
<object_block_hasher
>::iterator hi
;
7619 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab
, obj
, object_block
*, hi
)
7622 /* Sort them in order to output them in a deterministic manner,
7623 otherwise we may get .rodata sections in different orders with
7625 v
.qsort (output_object_block_compare
);
7627 FOR_EACH_VEC_ELT (v
, i
, obj
)
7628 output_object_block (obj
);
7633 /* This function provides a possible implementation of the
7634 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7635 by -frecord-gcc-switches it creates a new mergeable, string section in the
7636 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7637 contains the switches in ASCII format.
7639 FIXME: This code does not correctly handle double quote characters
7640 that appear inside strings, (it strips them rather than preserving them).
7641 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7642 characters - instead it treats them as sub-string separators. Since
7643 we want to emit NUL strings terminators into the object file we have to use
7647 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7651 case SWITCH_TYPE_PASSED
:
7652 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7653 ASM_OUTPUT_SKIP (asm_out_file
, HOST_WIDE_INT_1U
);
7656 case SWITCH_TYPE_DESCRIPTIVE
:
7659 /* Distinguish between invocations where name is NULL. */
7660 static bool started
= false;
7666 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7670 | (SECTION_ENTSIZE
& 1),
7672 switch_to_section (sec
);
7681 /* The return value is currently ignored by the caller, but must be 0.
7682 For -fverbose-asm the return value would be the number of characters
7683 emitted into the assembler file. */
7687 /* Emit text to declare externally defined symbols. It is needed to
7688 properly support non-default visibility. */
7690 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7692 const char *name ATTRIBUTE_UNUSED
)
7694 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7695 set in order to avoid putting out names that are never really
7696 used. Always output visibility specified in the source. */
7697 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7698 && (DECL_VISIBILITY_SPECIFIED (decl
)
7699 || targetm
.binds_local_p (decl
)))
7700 maybe_assemble_visibility (decl
);
7703 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7706 default_asm_output_source_filename (FILE *file
, const char *name
)
7708 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7709 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7711 fprintf (file
, "\t.file\t");
7712 output_quoted_string (file
, name
);
7717 /* Output a file name in the form wanted by System V. */
7720 output_file_directive (FILE *asm_file
, const char *input_name
)
7725 if (input_name
== NULL
)
7726 input_name
= "<stdin>";
7728 input_name
= remap_debug_filename (input_name
);
7730 len
= strlen (input_name
);
7731 na
= input_name
+ len
;
7733 /* NA gets INPUT_NAME sans directory names. */
7734 while (na
> input_name
)
7736 if (IS_DIR_SEPARATOR (na
[-1]))
7741 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7744 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7747 make_debug_expr_from_rtl (const_rtx exp
)
7749 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7750 machine_mode mode
= GET_MODE (exp
);
7753 DECL_ARTIFICIAL (ddecl
) = 1;
7754 if (REG_P (exp
) && REG_EXPR (exp
))
7755 type
= TREE_TYPE (REG_EXPR (exp
));
7756 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7757 type
= TREE_TYPE (MEM_EXPR (exp
));
7760 if (type
&& TYPE_MODE (type
) == mode
)
7761 TREE_TYPE (ddecl
) = type
;
7763 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7764 SET_DECL_MODE (ddecl
, mode
);
7765 dval
= gen_rtx_DEBUG_EXPR (mode
);
7766 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7767 SET_DECL_RTL (ddecl
, dval
);
7771 #ifdef ELF_ASCII_ESCAPES
7772 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7775 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7780 fputs (STRING_ASM_OP
, f
);
7785 escape
= ELF_ASCII_ESCAPES
[c
];
7793 putc ('0'+((c
>>6)&7), f
);
7794 putc ('0'+((c
>>3)&7), f
);
7795 putc ('0'+(c
&7), f
);
7808 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7811 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7813 const char *limit
= s
+ len
;
7814 const char *last_null
= NULL
;
7815 unsigned bytes_in_chunk
= 0;
7819 for (; s
< limit
; s
++)
7823 if (bytes_in_chunk
>= 60)
7832 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7839 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7841 if (bytes_in_chunk
> 0)
7848 default_elf_asm_output_limited_string (f
, s
);
7853 if (bytes_in_chunk
== 0)
7854 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7857 escape
= ELF_ASCII_ESCAPES
[c
];
7866 putc ('0'+((c
>>6)&7), f
);
7867 putc ('0'+((c
>>3)&7), f
);
7868 putc ('0'+(c
&7), f
);
7869 bytes_in_chunk
+= 4;
7874 bytes_in_chunk
+= 2;
7881 if (bytes_in_chunk
> 0)
7889 static GTY(()) section
*elf_init_array_section
;
7890 static GTY(()) section
*elf_fini_array_section
;
7893 get_elf_initfini_array_priority_section (int priority
,
7897 if (priority
!= DEFAULT_INIT_PRIORITY
)
7900 sprintf (buf
, "%s.%.5u",
7901 constructor_p
? ".init_array" : ".fini_array",
7903 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7909 if (elf_init_array_section
== NULL
)
7910 elf_init_array_section
7911 = get_section (".init_array",
7912 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7913 sec
= elf_init_array_section
;
7917 if (elf_fini_array_section
== NULL
)
7918 elf_fini_array_section
7919 = get_section (".fini_array",
7920 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7921 sec
= elf_fini_array_section
;
7927 /* Use .init_array section for constructors. */
7930 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7932 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7934 assemble_addr_to_section (symbol
, sec
);
7937 /* Use .fini_array section for destructors. */
7940 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7942 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7944 assemble_addr_to_section (symbol
, sec
);
7947 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7949 This is a bit of a cheat. The real default is a no-op, but this
7950 hook is the default for all targets with a .ident directive. */
7953 default_asm_output_ident_directive (const char *ident_str
)
7955 const char *ident_asm_op
= "\t.ident\t";
7957 /* If we are still in the front end, do not write out the string
7958 to asm_out_file. Instead, add a fake top-level asm statement.
7959 This allows the front ends to use this hook without actually
7960 writing to asm_out_file, to handle #ident or Pragma Ident. */
7961 if (symtab
->state
== PARSING
)
7963 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7964 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7967 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7971 /* This function ensures that vtable_map variables are not only
7972 in the comdat section, but that each variable has its own unique
7973 comdat name. Without this the variables end up in the same section
7974 with a single comdat name.
7976 FIXME: resolve_unique_section needs to deal better with
7977 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
7978 that is fixed, this if-else statement can be replaced with
7979 a single call to "switch_to_section (sect)". */
7982 handle_vtv_comdat_section (section
*sect
, const_tree decl ATTRIBUTE_UNUSED
)
7984 #if defined (OBJECT_FORMAT_ELF)
7985 targetm
.asm_out
.named_section (sect
->named
.name
,
7986 sect
->named
.common
.flags
7991 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
7992 Therefore the following check is used.
7993 In case a the target is PE or COFF a comdat group section
7994 is created, e.g. .vtable_map_vars$foo. The linker places
7995 everything in .vtable_map_vars at the end.
7997 A fix could be made in
7998 gcc/config/i386/winnt.c: i386_pe_unique_section. */
8003 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
8004 name
= ACONCAT ((sect
->named
.name
, "$",
8005 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
8007 name
= ACONCAT ((sect
->named
.name
, "$",
8008 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
8011 targetm
.asm_out
.named_section (name
,
8012 sect
->named
.common
.flags
8018 switch_to_section (sect
);
8022 #include "gt-varasm.h"