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 /* Return the read-only data section associated with function DECL. */
701 default_function_rodata_section (tree decl)
703 if (decl != NULL_TREE && DECL_SECTION_NAME (decl))
705 const char *name = DECL_SECTION_NAME (decl);
707 if (DECL_COMDAT_GROUP (decl) && HAVE_COMDAT_GROUP)
713 dot = strchr (name + 1, '.');
716 len = strlen (dot) + 8;
717 rname = (char *) alloca (len);
719 strcpy (rname, ".rodata");
721 return get_section (rname, SECTION_LINKONCE, decl);
723 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
724 else if (DECL_COMDAT_GROUP (decl)
725 && strncmp (name, ".gnu.linkonce.t.", 16) == 0)
727 size_t len = strlen (name) + 1;
728 char *rname = (char *) alloca (len);
730 memcpy (rname, name, len);
732 return get_section (rname, SECTION_LINKONCE, decl);
734 /* For .text.foo we want to use .rodata.foo. */
735 else if (flag_function_sections && flag_data_sections
736 && strncmp (name, ".text.", 6) == 0)
738 size_t len = strlen (name) + 1;
739 char *rname = (char *) alloca (len + 2);
741 memcpy (rname, ".rodata", 7);
742 memcpy (rname + 7, name + 5, len - 5);
743 return get_section (rname, 0, decl);
747 return readonly_data_section;
750 /* Return the read-only data section associated with function DECL
751 for targets where that section should be always the single
752 readonly data section. */
755 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED)
757 return readonly_data_section;
760 /* A subroutine of mergeable_string_section and mergeable_constant_section. */
763 function_mergeable_rodata_prefix (void)
765 section *s = targetm.asm_out.function_rodata_section (current_function_decl);
766 if (SECTION_STYLE (s) == SECTION_NAMED)
767 return s->named.name;
769 return targetm.asm_out.mergeable_rodata_prefix;
772 /* Return the section to use for string merging. */
775 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
776 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
777 unsigned int flags ATTRIBUTE_UNUSED)
781 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
782 && TREE_CODE (decl) == STRING_CST
783 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
785 && (len = int_size_in_bytes (TREE_TYPE (decl))) > 0
786 && TREE_STRING_LENGTH (decl) >= len)
788 scalar_int_mode mode;
789 unsigned int modesize;
793 const char *prefix = function_mergeable_rodata_prefix ();
794 char *name = (char *) alloca (strlen (prefix) + 30);
796 mode = SCALAR_INT_TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
797 modesize = GET_MODE_BITSIZE (mode);
798 if (modesize >= 8 && modesize <= 256
799 && (modesize & (modesize - 1)) == 0)
801 if (align < modesize)
804 str = TREE_STRING_POINTER (decl);
805 unit = GET_MODE_SIZE (mode);
807 /* Check for embedded NUL characters. */
808 for (i = 0; i < len; i += unit)
810 for (j = 0; j < unit; j++)
811 if (str[i + j] != '\0')
818 sprintf (name, "%s.str%d.%d", prefix,
819 modesize / 8, (int) (align / 8));
820 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
821 return get_section (name, flags, NULL);
826 return readonly_data_section;
829 /* Return the section to use for constant merging. */
832 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED,
833 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
834 unsigned int flags ATTRIBUTE_UNUSED)
836 unsigned int modesize = GET_MODE_BITSIZE (mode);
838 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
844 && (align & (align - 1)) == 0)
846 const char *prefix = function_mergeable_rodata_prefix ();
847 char *name = (char *) alloca (strlen (prefix) + 30);
849 sprintf (name, "%s.cst%d", prefix, (int) (align / 8));
850 flags |= (align / 8) | SECTION_MERGE;
851 return get_section (name, flags, NULL);
853 return readonly_data_section;
856 /* Given NAME, a putative register name, discard any customary prefixes. */
859 strip_reg_name (const char *name)
861 #ifdef REGISTER_PREFIX
862 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
863 name += strlen (REGISTER_PREFIX);
865 if (name[0] == '%' || name[0] == '#')
870 /* The user has asked for a DECL to have a particular name. Set (or
871 change) it in such a way that we don't prefix an underscore to
874 set_user_assembler_name (tree decl, const char *name)
876 char *starred = (char *) alloca (strlen (name) + 2);
878 strcpy (starred + 1, name);
879 symtab->change_decl_assembler_name (decl, get_identifier (starred));
880 SET_DECL_RTL (decl, NULL_RTX);
883 /* Decode an `asm' spec for a declaration as a register name.
884 Return the register number, or -1 if nothing specified,
885 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
886 or -3 if ASMSPEC is `cc' and is not recognized,
887 or -4 if ASMSPEC is `memory' and is not recognized.
888 Accept an exact spelling or a decimal number.
889 Prefixes such as % are optional. */
892 decode_reg_name_and_count (const char *asmspec, int *pnregs)
894 /* Presume just one register is clobbered. */
901 /* Get rid of confusing prefixes. */
902 asmspec = strip_reg_name (asmspec);
904 /* Allow a decimal number as a "register name". */
905 for (i = strlen (asmspec) - 1; i >= 0; i--)
906 if (! ISDIGIT (asmspec[i]))
908 if (asmspec[0] != 0 && i < 0)
911 if (i < FIRST_PSEUDO_REGISTER && i >= 0 && reg_names[i][0])
917 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
919 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
922 #ifdef OVERLAPPING_REGISTER_NAMES
926 const char *const name;
929 } table[] = OVERLAPPING_REGISTER_NAMES;
931 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
933 && ! strcmp (asmspec, table[i].name))
935 *pnregs = table[i].nregs;
936 return table[i].number;
939 #endif /* OVERLAPPING_REGISTER_NAMES */
941 #ifdef ADDITIONAL_REGISTER_NAMES
943 static const struct { const char *const name; const int number; } table[]
944 = ADDITIONAL_REGISTER_NAMES;
946 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
948 && ! strcmp (asmspec, table[i].name)
949 && reg_names[table[i].number][0])
950 return table[i].number;
952 #endif /* ADDITIONAL_REGISTER_NAMES */
954 if (!strcmp (asmspec, "memory"))
957 if (!strcmp (asmspec, "cc"))
967 decode_reg_name (const char *name)
970 return decode_reg_name_and_count (name, &count);
974 /* Return true if DECL's initializer is suitable for a BSS section. */
977 bss_initializer_p (const_tree decl)
979 return (DECL_INITIAL (decl) == NULL
980 /* In LTO we have no errors in program; error_mark_node is used
981 to mark offlined constructors. */
982 || (DECL_INITIAL (decl) == error_mark_node
984 || (flag_zero_initialized_in_bss
985 /* Leave constant zeroes in .rodata so they
987 && !TREE_READONLY (decl)
988 && initializer_zerop (DECL_INITIAL (decl))));
991 /* Compute the alignment of variable specified by DECL.
992 DONT_OUTPUT_DATA is from assemble_variable. */
995 align_variable (tree decl, bool dont_output_data)
997 unsigned int align = DECL_ALIGN (decl);
999 /* In the case for initialing an array whose length isn't specified,
1000 where we have not yet been able to do the layout,
1001 figure out the proper alignment now. */
1002 if (dont_output_data && DECL_SIZE (decl) == 0
1003 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1004 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
1006 /* Some object file formats have a maximum alignment which they support.
1007 In particular, a.out format supports a maximum alignment of 4. */
1008 if (align > MAX_OFILE_ALIGNMENT)
1010 error ("alignment of %q+D is greater than maximum object "
1011 "file alignment %d", decl,
1012 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
1013 align = MAX_OFILE_ALIGNMENT;
1016 if (! DECL_USER_ALIGN (decl))
1018 #ifdef DATA_ABI_ALIGNMENT
1019 unsigned int data_abi_align
1020 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl), align);
1021 /* For backwards compatibility, don't assume the ABI alignment for
1023 if (! DECL_THREAD_LOCAL_P (decl) || data_abi_align <= BITS_PER_WORD)
1024 align = data_abi_align;
1027 /* On some machines, it is good to increase alignment sometimes.
1028 But as DECL_ALIGN is used both for actually emitting the variable
1029 and for code accessing the variable as guaranteed alignment, we
1030 can only increase the alignment if it is a performance optimization
1031 if the references to it must bind to the current definition. */
1032 if (decl_binds_to_current_def_p (decl)
1033 && !DECL_VIRTUAL_P (decl))
1035 #ifdef DATA_ALIGNMENT
1036 unsigned int data_align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1037 /* Don't increase alignment too much for TLS variables - TLS space
1039 if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
1042 if (DECL_INITIAL (decl) != 0
1043 /* In LTO we have no errors in program; error_mark_node is used
1044 to mark offlined constructors. */
1045 && (in_lto_p || DECL_INITIAL (decl) != error_mark_node))
1047 unsigned int const_align
1048 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align);
1049 /* Don't increase alignment too much for TLS variables - TLS
1050 space is too precious. */
1051 if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
1052 align = const_align;
1057 /* Reset the alignment in case we have made it tighter, so we can benefit
1058 from it in get_pointer_alignment. */
1059 SET_DECL_ALIGN (decl, align);
1062 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1063 beyond what align_variable returned. */
1066 get_variable_align (tree decl)
1068 unsigned int align = DECL_ALIGN (decl);
1070 /* For user aligned vars or static vars align_variable already did
1072 if (DECL_USER_ALIGN (decl) || !TREE_PUBLIC (decl))
1075 #ifdef DATA_ABI_ALIGNMENT
1076 if (DECL_THREAD_LOCAL_P (decl))
1077 align = DATA_ABI_ALIGNMENT (TREE_TYPE (decl), align);
1080 /* For decls that bind to the current definition, align_variable
1081 did also everything, except for not assuming ABI required alignment
1082 of TLS variables. For other vars, increase the alignment here
1083 as an optimization. */
1084 if (!decl_binds_to_current_def_p (decl))
1086 /* On some machines, it is good to increase alignment sometimes. */
1087 #ifdef DATA_ALIGNMENT
1088 unsigned int data_align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1089 /* Don't increase alignment too much for TLS variables - TLS space
1091 if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
1094 if (DECL_INITIAL (decl) != 0
1095 /* In LTO we have no errors in program; error_mark_node is used
1096 to mark offlined constructors. */
1097 && (in_lto_p || DECL_INITIAL (decl) != error_mark_node))
1099 unsigned int const_align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl),
1101 /* Don't increase alignment too much for TLS variables - TLS space
1103 if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
1104 align = const_align;
1111 /* Return the section into which the given VAR_DECL or CONST_DECL
1112 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1113 section should be used wherever possible. */
1116 get_variable_section (tree decl, bool prefer_noswitch_p)
1118 addr_space_t as = ADDR_SPACE_GENERIC;
1120 varpool_node *vnode = varpool_node::get (decl);
1123 vnode = vnode->ultimate_alias_target ();
1127 if (TREE_TYPE (decl) != error_mark_node)
1128 as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
1130 /* We need the constructor to figure out reloc flag. */
1132 vnode->get_constructor ();
1134 if (DECL_COMMON (decl))
1136 /* If the decl has been given an explicit section name, or it resides
1137 in a non-generic address space, then it isn't common, and shouldn't
1138 be handled as such. */
1139 gcc_assert (DECL_SECTION_NAME (decl) == NULL
1140 && ADDR_SPACE_GENERIC_P (as));
1141 if (DECL_THREAD_LOCAL_P (decl))
1142 return tls_comm_section;
1143 else if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
1144 return comm_section;
1147 if (DECL_INITIAL (decl) == error_mark_node)
1148 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
1149 else if (DECL_INITIAL (decl))
1150 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
1154 resolve_unique_section (decl, reloc, flag_data_sections);
1155 if (IN_NAMED_SECTION (decl))
1157 section *sect = get_named_section (decl, NULL, reloc);
1159 if ((sect->common.flags & SECTION_BSS) && !bss_initializer_p (decl))
1161 error_at (DECL_SOURCE_LOCATION (decl),
1162 "only zero initializers are allowed in section %qs",
1164 DECL_INITIAL (decl) = error_mark_node;
1169 if (ADDR_SPACE_GENERIC_P (as)
1170 && !DECL_THREAD_LOCAL_P (decl)
1171 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
1172 && bss_initializer_p (decl))
1174 if (!TREE_PUBLIC (decl)
1175 && !((flag_sanitize & SANITIZE_ADDRESS)
1176 && asan_protect_global (decl)))
1177 return lcomm_section;
1178 if (bss_noswitch_section)
1179 return bss_noswitch_section;
1182 return targetm.asm_out.select_section (decl, reloc,
1183 get_variable_align (decl));
1186 /* Return the block into which object_block DECL should be placed. */
1188 static struct object_block *
1189 get_block_for_decl (tree decl)
1195 /* The object must be defined in this translation unit. */
1196 if (DECL_EXTERNAL (decl))
1199 /* There's no point using object blocks for something that is
1200 isolated by definition. */
1201 if (DECL_COMDAT_GROUP (decl))
1205 /* We can only calculate block offsets if the decl has a known
1207 if (DECL_SIZE_UNIT (decl) == NULL)
1209 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl)))
1212 /* Find out which section should contain DECL. We cannot put it into
1213 an object block if it requires a standalone definition. */
1215 align_variable (decl, 0);
1216 sect = get_variable_section (decl, true);
1217 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1220 return get_block_for_section (sect);
1223 /* Make sure block symbol SYMBOL is in block BLOCK. */
1226 change_symbol_block (rtx symbol, struct object_block *block)
1228 if (block != SYMBOL_REF_BLOCK (symbol))
1230 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
1231 SYMBOL_REF_BLOCK (symbol) = block;
1235 /* Return true if it is possible to put DECL in an object_block. */
1238 use_blocks_for_decl_p (tree decl)
1240 struct symtab_node *snode;
1242 /* Only data DECLs can be placed into object blocks. */
1243 if (!VAR_P (decl) && TREE_CODE (decl) != CONST_DECL)
1246 /* Detect decls created by dw2_force_const_mem. Such decls are
1247 special because DECL_INITIAL doesn't specify the decl's true value.
1248 dw2_output_indirect_constants will instead call assemble_variable
1249 with dont_output_data set to 1 and then print the contents itself. */
1250 if (DECL_INITIAL (decl) == decl)
1253 /* If this decl is an alias, then we don't want to emit a
1256 && (snode = symtab_node::get (decl)) != NULL
1260 return targetm.use_blocks_for_decl_p (decl);
1263 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1264 until we find an identifier that is not itself a transparent alias.
1265 Modify the alias passed to it by reference (and all aliases on the
1266 way to the ultimate target), such that they do not have to be
1267 followed again, and return the ultimate target of the alias
1271 ultimate_transparent_alias_target (tree *alias)
1273 tree target = *alias;
1275 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
1277 gcc_assert (TREE_CHAIN (target));
1278 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
1279 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
1280 && ! TREE_CHAIN (target));
1287 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1288 have static storage duration. In other words, it should not be an
1289 automatic variable, including PARM_DECLs.
1291 There is, however, one exception: this function handles variables
1292 explicitly placed in a particular register by the user.
1294 This is never called for PARM_DECL nodes. */
1297 make_decl_rtl (tree decl)
1299 const char *name = 0;
1304 /* Check that we are not being given an automatic variable. */
1305 gcc_assert (TREE_CODE (decl) != PARM_DECL
1306 && TREE_CODE (decl) != RESULT_DECL);
1308 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1309 gcc_assert (!VAR_P (decl)
1310 || TREE_STATIC (decl)
1311 || TREE_PUBLIC (decl)
1312 || DECL_EXTERNAL (decl)
1313 || DECL_REGISTER (decl));
1315 /* And that we were not given a type or a label. */
1316 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1317 && TREE_CODE (decl) != LABEL_DECL);
1319 /* For a duplicate declaration, we can be called twice on the
1320 same DECL node. Don't discard the RTL already made. */
1321 if (DECL_RTL_SET_P (decl))
1323 /* If the old RTL had the wrong mode, fix the mode. */
1324 x = DECL_RTL (decl);
1325 if (GET_MODE (x) != DECL_MODE (decl))
1326 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1328 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1331 /* ??? Another way to do this would be to maintain a hashed
1332 table of such critters. Instead of adding stuff to a DECL
1333 to give certain attributes to it, we could use an external
1334 hash map from DECL to set of attributes. */
1336 /* Let the target reassign the RTL if it wants.
1337 This is necessary, for example, when one machine specific
1338 decl attribute overrides another. */
1339 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1341 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1342 on the new decl information. */
1344 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1345 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1346 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1351 /* If this variable belongs to the global constant pool, retrieve the
1352 pre-computed RTL or recompute it in LTO mode. */
1353 if (VAR_P (decl) && DECL_IN_CONSTANT_POOL (decl))
1355 SET_DECL_RTL (decl, output_constant_def (DECL_INITIAL (decl), 1));
1359 id = DECL_ASSEMBLER_NAME (decl);
1360 if (TREE_CODE (decl) == FUNCTION_DECL
1361 && cgraph_node::get (decl)
1362 && cgraph_node::get (decl)->instrumentation_clone)
1363 ultimate_transparent_alias_target (&id);
1364 name = IDENTIFIER_POINTER (id);
1366 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1367 && DECL_REGISTER (decl))
1369 error ("register name not specified for %q+D", decl);
1371 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1373 const char *asmspec = name+1;
1374 machine_mode mode = DECL_MODE (decl);
1375 reg_number = decode_reg_name (asmspec);
1376 /* First detect errors in declaring global registers. */
1377 if (reg_number == -1)
1378 error ("register name not specified for %q+D", decl);
1379 else if (reg_number < 0)
1380 error ("invalid register name for %q+D", decl);
1381 else if (mode == BLKmode)
1382 error ("data type of %q+D isn%'t suitable for a register",
1384 else if (!in_hard_reg_set_p (accessible_reg_set, mode, reg_number))
1385 error ("the register specified for %q+D cannot be accessed"
1386 " by the current target", decl);
1387 else if (!in_hard_reg_set_p (operand_reg_set, mode, reg_number))
1388 error ("the register specified for %q+D is not general enough"
1389 " to be used as a register variable", decl);
1390 else if (!HARD_REGNO_MODE_OK (reg_number, mode))
1391 error ("register specified for %q+D isn%'t suitable for data type",
1393 /* Now handle properly declared static register variables. */
1398 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1400 DECL_INITIAL (decl) = 0;
1401 error ("global register variable has initial value");
1403 if (TREE_THIS_VOLATILE (decl))
1404 warning (OPT_Wvolatile_register_var,
1405 "optimization may eliminate reads and/or "
1406 "writes to register variables");
1408 /* If the user specified one of the eliminables registers here,
1409 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1410 confused with that register and be eliminated. This usage is
1411 somewhat suspect... */
1413 SET_DECL_RTL (decl, gen_raw_REG (mode, reg_number));
1414 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1415 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1417 if (TREE_STATIC (decl))
1419 /* Make this register global, so not usable for anything
1421 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1422 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1423 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1425 nregs = hard_regno_nregs[reg_number][mode];
1427 globalize_reg (decl, reg_number + --nregs);
1430 /* As a register variable, it has no section. */
1433 /* Avoid internal errors from invalid register
1435 SET_DECL_ASSEMBLER_NAME (decl, NULL_TREE);
1436 DECL_HARD_REGISTER (decl) = 0;
1437 /* Also avoid SSA inconsistencies by pretending this is an external
1439 DECL_EXTERNAL (decl) = 1;
1442 /* Now handle ordinary static variables and functions (in memory).
1443 Also handle vars declared register invalidly. */
1444 else if (name[0] == '*')
1446 #ifdef REGISTER_PREFIX
1447 if (strlen (REGISTER_PREFIX) != 0)
1449 reg_number = decode_reg_name (name);
1450 if (reg_number >= 0 || reg_number == -3)
1451 error ("register name given for non-register variable %q+D", decl);
1456 /* Specifying a section attribute on a variable forces it into a
1457 non-.bss section, and thus it cannot be common. */
1458 /* FIXME: In general this code should not be necessary because
1459 visibility pass is doing the same work. But notice_global_symbol
1460 is called early and it needs to make DECL_RTL to get the name.
1461 we take care of recomputing the DECL_RTL after visibility is changed. */
1463 && (TREE_STATIC (decl) || DECL_EXTERNAL (decl))
1464 && DECL_SECTION_NAME (decl) != NULL
1465 && DECL_INITIAL (decl) == NULL_TREE
1466 && DECL_COMMON (decl))
1467 DECL_COMMON (decl) = 0;
1469 /* Variables can't be both common and weak. */
1470 if (VAR_P (decl) && DECL_WEAK (decl))
1471 DECL_COMMON (decl) = 0;
1473 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1474 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1477 machine_mode address_mode = Pmode;
1478 if (TREE_TYPE (decl) != error_mark_node)
1480 addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
1481 address_mode = targetm.addr_space.address_mode (as);
1483 x = gen_rtx_SYMBOL_REF (address_mode, name);
1485 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1486 SET_SYMBOL_REF_DECL (x, decl);
1488 x = gen_rtx_MEM (DECL_MODE (decl), x);
1489 if (TREE_CODE (decl) != FUNCTION_DECL)
1490 set_mem_attributes (x, decl, 1);
1491 SET_DECL_RTL (decl, x);
1493 /* Optionally set flags or add text to the name to record information
1494 such as that it is a function name.
1495 If the name is changed, the macro ASM_OUTPUT_LABELREF
1496 will have to know how to strip this information. */
1497 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1500 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1501 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1505 make_decl_rtl_for_debug (tree decl)
1507 unsigned int save_aliasing_flag;
1510 if (DECL_RTL_SET_P (decl))
1511 return DECL_RTL (decl);
1513 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1514 call new_alias_set. If running with -fcompare-debug, sometimes
1515 we do not want to create alias sets that will throw the alias
1516 numbers off in the comparison dumps. So... clearing
1517 flag_strict_aliasing will keep new_alias_set() from creating a
1519 save_aliasing_flag = flag_strict_aliasing;
1520 flag_strict_aliasing = 0;
1522 rtl = DECL_RTL (decl);
1523 /* Reset DECL_RTL back, as various parts of the compiler expects
1524 DECL_RTL set meaning it is actually going to be output. */
1525 SET_DECL_RTL (decl, NULL);
1527 flag_strict_aliasing = save_aliasing_flag;
1531 /* Output a string of literal assembler code
1532 for an `asm' keyword used between functions. */
1535 assemble_asm (tree string)
1540 if (TREE_CODE (string) == ADDR_EXPR)
1541 string = TREE_OPERAND (string, 0);
1543 p = TREE_STRING_POINTER (string);
1544 fprintf (asm_out_file, "%s%s\n", p[0] == '\t' ? "" : "\t", p);
1547 /* Write the address of the entity given by SYMBOL to SEC. */
1549 assemble_addr_to_section (rtx symbol, section *sec)
1551 switch_to_section (sec);
1552 assemble_align (POINTER_SIZE);
1553 assemble_integer (symbol, POINTER_SIZE_UNITS, POINTER_SIZE, 1);
1556 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1557 not) section for PRIORITY. */
1559 get_cdtor_priority_section (int priority, bool constructor_p)
1561 /* Buffer conservatively large enough for the full range of a 32-bit
1562 int plus the text below. */
1565 /* ??? This only works reliably with the GNU linker. */
1566 sprintf (buf, "%s.%.5u",
1567 constructor_p ? ".ctors" : ".dtors",
1568 /* Invert the numbering so the linker puts us in the proper
1569 order; constructors are run from right to left, and the
1570 linker sorts in increasing order. */
1571 MAX_INIT_PRIORITY - priority);
1572 return get_section (buf, SECTION_WRITE, NULL);
1576 default_named_section_asm_out_destructor (rtx symbol, int priority)
1580 if (priority != DEFAULT_INIT_PRIORITY)
1581 sec = get_cdtor_priority_section (priority,
1582 /*constructor_p=*/false);
1584 sec = get_section (".dtors", SECTION_WRITE, NULL);
1586 assemble_addr_to_section (symbol, sec);
1589 #ifdef DTORS_SECTION_ASM_OP
1591 default_dtor_section_asm_out_destructor (rtx symbol,
1592 int priority ATTRIBUTE_UNUSED)
1594 assemble_addr_to_section (symbol, dtors_section);
1599 default_named_section_asm_out_constructor (rtx symbol, int priority)
1603 if (priority != DEFAULT_INIT_PRIORITY)
1604 sec = get_cdtor_priority_section (priority,
1605 /*constructor_p=*/true);
1607 sec = get_section (".ctors", SECTION_WRITE, NULL);
1609 assemble_addr_to_section (symbol, sec);
1612 #ifdef CTORS_SECTION_ASM_OP
1614 default_ctor_section_asm_out_constructor (rtx symbol,
1615 int priority ATTRIBUTE_UNUSED)
1617 assemble_addr_to_section (symbol, ctors_section);
1621 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1622 a nonzero value if the constant pool should be output before the
1623 start of the function, or a zero value if the pool should output
1624 after the end of the function. The default is to put it before the
1627 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1628 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1631 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1632 to be output to assembler.
1633 Set first_global_object_name and weak_global_object_name as appropriate. */
1636 notice_global_symbol (tree decl)
1638 const char **t = &first_global_object_name;
1640 if (first_global_object_name
1641 || !TREE_PUBLIC (decl)
1642 || DECL_EXTERNAL (decl)
1643 || !DECL_NAME (decl)
1644 || (VAR_P (decl) && DECL_HARD_REGISTER (decl))
1645 || (TREE_CODE (decl) != FUNCTION_DECL
1647 || (DECL_COMMON (decl)
1648 && (DECL_INITIAL (decl) == 0
1649 || DECL_INITIAL (decl) == error_mark_node)))))
1652 /* We win when global object is found, but it is useful to know about weak
1653 symbol as well so we can produce nicer unique names. */
1654 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl) || flag_shlib)
1655 t = &weak_global_object_name;
1659 tree id = DECL_ASSEMBLER_NAME (decl);
1660 ultimate_transparent_alias_target (&id);
1661 *t = ggc_strdup (targetm.strip_name_encoding (IDENTIFIER_POINTER (id)));
1665 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1666 current function goes into the cold section, so that targets can use
1667 current_function_section during RTL expansion. DECL describes the
1671 decide_function_section (tree decl)
1673 first_function_block_is_cold = false;
1675 if (DECL_SECTION_NAME (decl))
1677 struct cgraph_node *node = cgraph_node::get (current_function_decl);
1678 /* Calls to function_section rely on first_function_block_is_cold
1680 first_function_block_is_cold = (node
1682 == NODE_FREQUENCY_UNLIKELY_EXECUTED);
1685 in_cold_section_p = first_function_block_is_cold;
1688 /* Get the function's name, as described by its RTL. This may be
1689 different from the DECL_NAME name used in the source file. */
1691 get_fnname_from_decl (tree decl)
1693 rtx x = DECL_RTL (decl);
1694 gcc_assert (MEM_P (x));
1696 gcc_assert (GET_CODE (x) == SYMBOL_REF);
1700 /* Output assembler code for the constant pool of a function and associated
1701 with defining the name of the function. DECL describes the function.
1702 NAME is the function's name. For the constant pool, we use the current
1703 constant pool data. */
1706 assemble_start_function (tree decl, const char *fnname)
1709 char tmp_label[100];
1710 bool hot_label_written = false;
1712 if (crtl->has_bb_partition)
1714 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1715 crtl->subsections.hot_section_label = ggc_strdup (tmp_label);
1716 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1717 crtl->subsections.cold_section_label = ggc_strdup (tmp_label);
1718 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1719 crtl->subsections.hot_section_end_label = ggc_strdup (tmp_label);
1720 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1721 crtl->subsections.cold_section_end_label = ggc_strdup (tmp_label);
1723 cold_function_name = NULL_TREE;
1727 crtl->subsections.hot_section_label = NULL;
1728 crtl->subsections.cold_section_label = NULL;
1729 crtl->subsections.hot_section_end_label = NULL;
1730 crtl->subsections.cold_section_end_label = NULL;
1733 /* The following code does not need preprocessing in the assembler. */
1737 if (CONSTANT_POOL_BEFORE_FUNCTION)
1738 output_constant_pool (fnname, decl);
1740 align = symtab_node::get (decl)->definition_alignment ();
1742 /* Make sure the not and cold text (code) sections are properly
1743 aligned. This is necessary here in the case where the function
1744 has both hot and cold sections, because we don't want to re-set
1745 the alignment when the section switch happens mid-function. */
1747 if (crtl->has_bb_partition)
1749 first_function_block_is_cold = false;
1751 switch_to_section (unlikely_text_section ());
1752 assemble_align (align);
1753 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_label);
1755 /* When the function starts with a cold section, we need to explicitly
1756 align the hot section and write out the hot section label.
1757 But if the current function is a thunk, we do not have a CFG. */
1759 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun)->next_bb) == BB_COLD_PARTITION)
1761 switch_to_section (text_section);
1762 assemble_align (align);
1763 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1764 hot_label_written = true;
1765 first_function_block_is_cold = true;
1767 in_cold_section_p = first_function_block_is_cold;
1771 /* Switch to the correct text section for the start of the function. */
1773 switch_to_section (function_section (decl));
1774 if (crtl->has_bb_partition && !hot_label_written)
1775 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1777 /* Tell assembler to move to target machine's alignment for functions. */
1778 align = floor_log2 (align / BITS_PER_UNIT);
1781 ASM_OUTPUT_ALIGN (asm_out_file, align);
1784 /* Handle a user-specified function alignment.
1785 Note that we still need to align to DECL_ALIGN, as above,
1786 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1787 if (! DECL_USER_ALIGN (decl)
1788 && align_functions_log > align
1789 && optimize_function_for_speed_p (cfun))
1791 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1792 int align_log = align_functions_log;
1794 int max_skip = align_functions - 1;
1795 if (flag_limit_function_alignment && crtl->max_insn_address > 0
1796 && max_skip >= crtl->max_insn_address)
1797 max_skip = crtl->max_insn_address - 1;
1799 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1800 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file, align_log, max_skip);
1802 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1806 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1807 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1810 if (!DECL_IGNORED_P (decl))
1811 (*debug_hooks->begin_function) (decl);
1813 /* Make function name accessible from other files, if appropriate. */
1815 if (TREE_PUBLIC (decl)
1816 || (cgraph_node::get (decl)->instrumentation_clone
1817 && cgraph_node::get (decl)->instrumented_version
1818 && TREE_PUBLIC (cgraph_node::get (decl)->instrumented_version->decl)))
1820 notice_global_symbol (decl);
1822 globalize_decl (decl);
1824 maybe_assemble_visibility (decl);
1827 if (DECL_PRESERVE_P (decl))
1828 targetm.asm_out.mark_decl_preserved (fnname);
1830 unsigned HOST_WIDE_INT patch_area_size = function_entry_patch_area_size;
1831 unsigned HOST_WIDE_INT patch_area_entry = function_entry_patch_area_start;
1833 tree patchable_function_entry_attr
1834 = lookup_attribute ("patchable_function_entry", DECL_ATTRIBUTES (decl));
1835 if (patchable_function_entry_attr)
1837 tree pp_val = TREE_VALUE (patchable_function_entry_attr);
1838 tree patchable_function_entry_value1 = TREE_VALUE (pp_val);
1840 if (tree_fits_uhwi_p (patchable_function_entry_value1))
1841 patch_area_size = tree_to_uhwi (patchable_function_entry_value1);
1845 patch_area_entry = 0;
1846 if (list_length (pp_val) > 1)
1848 tree patchable_function_entry_value2 =
1849 TREE_VALUE (TREE_CHAIN (pp_val));
1851 if (tree_fits_uhwi_p (patchable_function_entry_value2))
1852 patch_area_entry = tree_to_uhwi (patchable_function_entry_value2);
1858 if (patch_area_entry > patch_area_size)
1860 if (patch_area_size > 0)
1861 warning (OPT_Wattributes, "Patchable function entry > size");
1862 patch_area_entry = 0;
1865 /* Emit the patching area before the entry label, if any. */
1866 if (patch_area_entry > 0)
1867 targetm.asm_out.print_patchable_function_entry (asm_out_file,
1868 patch_area_entry, true);
1870 /* Do any machine/system dependent processing of the function name. */
1871 #ifdef ASM_DECLARE_FUNCTION_NAME
1872 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1874 /* Standard thing is just output label for the function. */
1875 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file, fnname, current_function_decl);
1876 #endif /* ASM_DECLARE_FUNCTION_NAME */
1878 /* And the area after the label. Record it if we haven't done so yet. */
1879 if (patch_area_size > patch_area_entry)
1880 targetm.asm_out.print_patchable_function_entry (asm_out_file,
1881 patch_area_size-patch_area_entry,
1882 patch_area_entry == 0);
1884 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl)))
1885 saw_no_split_stack = true;
1888 /* Output assembler code associated with defining the size of the
1889 function. DECL describes the function. NAME is the function's name. */
1892 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1894 #ifdef ASM_DECLARE_FUNCTION_SIZE
1895 /* We could have switched section in the middle of the function. */
1896 if (crtl->has_bb_partition)
1897 switch_to_section (function_section (decl));
1898 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1900 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1902 output_constant_pool (fnname, decl);
1903 switch_to_section (function_section (decl)); /* need to switch back */
1905 /* Output labels for end of hot/cold text sections (to be used by
1907 if (crtl->has_bb_partition)
1909 section *save_text_section;
1911 save_text_section = in_section;
1912 switch_to_section (unlikely_text_section ());
1913 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
1914 if (cold_function_name != NULL_TREE)
1915 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file,
1916 IDENTIFIER_POINTER (cold_function_name),
1919 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_end_label);
1920 if (first_function_block_is_cold)
1921 switch_to_section (text_section);
1923 switch_to_section (function_section (decl));
1924 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_end_label);
1925 switch_to_section (save_text_section);
1929 /* Assemble code to leave SIZE bytes of zeros. */
1932 assemble_zeros (unsigned HOST_WIDE_INT size)
1934 /* Do no output if -fsyntax-only. */
1935 if (flag_syntax_only)
1938 #ifdef ASM_NO_SKIP_IN_TEXT
1939 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1940 so we must output 0s explicitly in the text section. */
1941 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1943 unsigned HOST_WIDE_INT i;
1944 for (i = 0; i < size; i++)
1945 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1950 ASM_OUTPUT_SKIP (asm_out_file, size);
1953 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1956 assemble_align (int align)
1958 if (align > BITS_PER_UNIT)
1960 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1964 /* Assemble a string constant with the specified C string as contents. */
1967 assemble_string (const char *p, int size)
1972 /* If the string is very long, split it up. */
1976 int thissize = size - pos;
1977 if (thissize > maximum)
1980 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1988 /* A noswitch_section_callback for lcomm_section. */
1991 emit_local (tree decl ATTRIBUTE_UNUSED,
1992 const char *name ATTRIBUTE_UNUSED,
1993 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1994 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1996 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1997 unsigned int align = symtab_node::get (decl)->definition_alignment ();
1998 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
2001 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
2002 unsigned int align = symtab_node::get (decl)->definition_alignment ();
2003 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, align);
2006 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2011 /* A noswitch_section_callback for bss_noswitch_section. */
2013 #if defined ASM_OUTPUT_ALIGNED_BSS
2015 emit_bss (tree decl ATTRIBUTE_UNUSED,
2016 const char *name ATTRIBUTE_UNUSED,
2017 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
2018 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
2020 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size,
2021 get_variable_align (decl));
2026 /* A noswitch_section_callback for comm_section. */
2029 emit_common (tree decl ATTRIBUTE_UNUSED,
2030 const char *name ATTRIBUTE_UNUSED,
2031 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
2032 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
2034 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
2035 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
2036 size, get_variable_align (decl));
2038 #elif defined ASM_OUTPUT_ALIGNED_COMMON
2039 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size,
2040 get_variable_align (decl));
2043 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
2048 /* A noswitch_section_callback for tls_comm_section. */
2051 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
2052 const char *name ATTRIBUTE_UNUSED,
2053 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
2054 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
2056 #ifdef ASM_OUTPUT_TLS_COMMON
2057 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
2060 sorry ("thread-local COMMON data not implemented");
2065 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2066 NAME is the name of DECL's SYMBOL_REF. */
2069 assemble_noswitch_variable (tree decl, const char *name, section *sect,
2072 unsigned HOST_WIDE_INT size, rounded;
2074 size = tree_to_uhwi (DECL_SIZE_UNIT (decl));
2077 if ((flag_sanitize & SANITIZE_ADDRESS) && asan_protect_global (decl))
2078 size += asan_red_zone_size (size);
2080 /* Don't allocate zero bytes of common,
2081 since that means "undefined external" in the linker. */
2085 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2086 so that each uninitialized object starts on such a boundary. */
2087 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
2088 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2089 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2091 if (!sect->noswitch.callback (decl, name, size, rounded)
2092 && (unsigned HOST_WIDE_INT) (align / BITS_PER_UNIT) > rounded)
2093 error ("requested alignment for %q+D is greater than "
2094 "implemented alignment of %wu", decl, rounded);
2097 /* A subroutine of assemble_variable. Output the label and contents of
2098 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2099 is as for assemble_variable. */
2102 assemble_variable_contents (tree decl, const char *name,
2103 bool dont_output_data)
2105 /* Do any machine/system dependent processing of the object. */
2106 #ifdef ASM_DECLARE_OBJECT_NAME
2107 last_assemble_variable_decl = decl;
2108 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
2110 /* Standard thing is just output label for the object. */
2111 ASM_OUTPUT_LABEL (asm_out_file, name);
2112 #endif /* ASM_DECLARE_OBJECT_NAME */
2114 if (!dont_output_data)
2116 /* Caller is supposed to use varpool_get_constructor when it wants
2117 to output the body. */
2118 gcc_assert (!in_lto_p || DECL_INITIAL (decl) != error_mark_node);
2119 if (DECL_INITIAL (decl)
2120 && DECL_INITIAL (decl) != error_mark_node
2121 && !initializer_zerop (DECL_INITIAL (decl)))
2122 /* Output the actual data. */
2123 output_constant (DECL_INITIAL (decl),
2124 tree_to_uhwi (DECL_SIZE_UNIT (decl)),
2125 get_variable_align (decl),
2128 /* Leave space for it. */
2129 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl)));
2130 targetm.asm_out.decl_end ();
2134 /* Write out assembly for the variable DECL, which is not defined in
2135 the current translation unit. */
2137 assemble_undefined_decl (tree decl)
2139 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
2140 targetm.asm_out.assemble_undefined_decl (asm_out_file, name, decl);
2143 /* Assemble everything that is needed for a variable or function declaration.
2144 Not used for automatic variables, and not used for function definitions.
2145 Should not be called for variables of incomplete structure type.
2147 TOP_LEVEL is nonzero if this variable has file scope.
2148 AT_END is nonzero if this is the special handling, at end of compilation,
2149 to define things that have had only tentative definitions.
2150 DONT_OUTPUT_DATA if nonzero means don't actually output the
2151 initial value (that will be done by the caller). */
2154 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
2155 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
2158 rtx decl_rtl, symbol;
2161 bool asan_protected = false;
2163 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2164 gcc_assert (VAR_P (decl));
2166 /* Emulated TLS had better not get this far. */
2167 gcc_checking_assert (targetm.have_tls || !DECL_THREAD_LOCAL_P (decl));
2169 last_assemble_variable_decl = 0;
2171 /* Normally no need to say anything here for external references,
2172 since assemble_external is called by the language-specific code
2173 when a declaration is first seen. */
2175 if (DECL_EXTERNAL (decl))
2178 /* Do nothing for global register variables. */
2179 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
2181 TREE_ASM_WRITTEN (decl) = 1;
2185 /* If type was incomplete when the variable was declared,
2186 see if it is complete now. */
2188 if (DECL_SIZE (decl) == 0)
2189 layout_decl (decl, 0);
2191 /* Still incomplete => don't allocate it; treat the tentative defn
2192 (which is what it must have been) as an `extern' reference. */
2194 if (!dont_output_data && DECL_SIZE (decl) == 0)
2196 error ("storage size of %q+D isn%'t known", decl);
2197 TREE_ASM_WRITTEN (decl) = 1;
2201 /* The first declaration of a variable that comes through this function
2202 decides whether it is global (in C, has external linkage)
2203 or local (in C, has internal linkage). So do nothing more
2204 if this function has already run. */
2206 if (TREE_ASM_WRITTEN (decl))
2209 /* Make sure targetm.encode_section_info is invoked before we set
2211 decl_rtl = DECL_RTL (decl);
2213 TREE_ASM_WRITTEN (decl) = 1;
2215 /* Do no output if -fsyntax-only. */
2216 if (flag_syntax_only)
2219 if (! dont_output_data
2220 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl)))
2222 error ("size of variable %q+D is too large", decl);
2226 gcc_assert (MEM_P (decl_rtl));
2227 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
2228 symbol = XEXP (decl_rtl, 0);
2230 /* If this symbol belongs to the tree constant pool, output the constant
2231 if it hasn't already been written. */
2232 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
2234 tree decl = SYMBOL_REF_DECL (symbol);
2235 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl)))
2236 output_constant_def_contents (symbol);
2242 name = XSTR (symbol, 0);
2243 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
2244 notice_global_symbol (decl);
2246 /* Compute the alignment of this data. */
2248 align_variable (decl, dont_output_data);
2250 if ((flag_sanitize & SANITIZE_ADDRESS)
2251 && asan_protect_global (decl))
2253 asan_protected = true;
2254 SET_DECL_ALIGN (decl, MAX (DECL_ALIGN (decl),
2255 ASAN_RED_ZONE_SIZE * BITS_PER_UNIT));
2258 set_mem_align (decl_rtl, DECL_ALIGN (decl));
2260 align = get_variable_align (decl);
2262 if (TREE_PUBLIC (decl))
2263 maybe_assemble_visibility (decl);
2265 if (DECL_PRESERVE_P (decl))
2266 targetm.asm_out.mark_decl_preserved (name);
2268 /* First make the assembler name(s) global if appropriate. */
2269 sect = get_variable_section (decl, false);
2270 if (TREE_PUBLIC (decl)
2271 && (sect->common.flags & SECTION_COMMON) == 0)
2272 globalize_decl (decl);
2274 /* Output any data that we will need to use the address of. */
2275 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
2276 output_addressed_constants (DECL_INITIAL (decl));
2278 /* dbxout.c needs to know this. */
2279 if (sect && (sect->common.flags & SECTION_CODE) != 0)
2280 DECL_IN_TEXT_SECTION (decl) = 1;
2282 /* If the decl is part of an object_block, make sure that the decl
2283 has been positioned within its block, but do not write out its
2284 definition yet. output_object_blocks will do that later. */
2285 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2287 gcc_assert (!dont_output_data);
2288 place_block_symbol (symbol);
2290 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
2291 assemble_noswitch_variable (decl, name, sect, align);
2294 /* Special-case handling of vtv comdat sections. */
2295 if (sect->named.name
2296 && (strcmp (sect->named.name, ".vtable_map_vars") == 0))
2297 handle_vtv_comdat_section (sect, decl);
2299 switch_to_section (sect);
2300 if (align > BITS_PER_UNIT)
2301 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
2302 assemble_variable_contents (decl, name, dont_output_data);
2305 unsigned HOST_WIDE_INT int size
2306 = tree_to_uhwi (DECL_SIZE_UNIT (decl));
2307 assemble_zeros (asan_red_zone_size (size));
2313 /* Given a function declaration (FN_DECL), this function assembles the
2314 function into the .preinit_array section. */
2317 assemble_vtv_preinit_initializer (tree fn_decl)
2320 unsigned flags = SECTION_WRITE;
2321 rtx symbol = XEXP (DECL_RTL (fn_decl), 0);
2323 flags |= SECTION_NOTYPE;
2324 sect = get_section (".preinit_array", flags, fn_decl);
2325 switch_to_section (sect);
2326 assemble_addr_to_section (symbol, sect);
2329 /* Return 1 if type TYPE contains any pointers. */
2332 contains_pointers_p (tree type)
2334 switch (TREE_CODE (type))
2337 case REFERENCE_TYPE:
2338 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2339 so I'll play safe and return 1. */
2345 case QUAL_UNION_TYPE:
2348 /* For a type that has fields, see if the fields have pointers. */
2349 for (fields = TYPE_FIELDS (type); fields; fields = DECL_CHAIN (fields))
2350 if (TREE_CODE (fields) == FIELD_DECL
2351 && contains_pointers_p (TREE_TYPE (fields)))
2357 /* An array type contains pointers if its element type does. */
2358 return contains_pointers_p (TREE_TYPE (type));
2365 /* We delay assemble_external processing until
2366 the compilation unit is finalized. This is the best we can do for
2367 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2368 it all the way to final. See PR 17982 for further discussion. */
2369 static GTY(()) tree pending_assemble_externals;
2371 #ifdef ASM_OUTPUT_EXTERNAL
2372 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2373 As a result, assemble_external can be called after the list of externals
2374 is processed and the pointer set destroyed. */
2375 static bool pending_assemble_externals_processed;
2377 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2378 TREE_LIST in assemble_external. */
2379 static hash_set<tree> *pending_assemble_externals_set;
2381 /* True if DECL is a function decl for which no out-of-line copy exists.
2382 It is assumed that DECL's assembler name has been set. */
2385 incorporeal_function_p (tree decl)
2387 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
2391 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
2392 && (DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA
2393 || DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA_WITH_ALIGN))
2396 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
2397 /* Atomic or sync builtins which have survived this far will be
2398 resolved externally and therefore are not incorporeal. */
2399 if (strncmp (name, "__builtin_", 10) == 0)
2405 /* Actually do the tests to determine if this is necessary, and invoke
2406 ASM_OUTPUT_EXTERNAL. */
2408 assemble_external_real (tree decl)
2410 rtx rtl = DECL_RTL (decl);
2412 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
2413 && !SYMBOL_REF_USED (XEXP (rtl, 0))
2414 && !incorporeal_function_p (decl))
2416 /* Some systems do require some output. */
2417 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
2418 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
2424 process_pending_assemble_externals (void)
2426 #ifdef ASM_OUTPUT_EXTERNAL
2428 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
2429 assemble_external_real (TREE_VALUE (list));
2431 pending_assemble_externals = 0;
2432 pending_assemble_externals_processed = true;
2433 delete pending_assemble_externals_set;
2437 /* This TREE_LIST contains any weak symbol declarations waiting
2439 static GTY(()) tree weak_decls;
2441 /* Output something to declare an external symbol to the assembler,
2442 and qualifiers such as weakness. (Most assemblers don't need
2443 extern declaration, so we normally output nothing.) Do nothing if
2444 DECL is not external. */
2447 assemble_external (tree decl ATTRIBUTE_UNUSED)
2449 /* Make sure that the ASM_OUT_FILE is open.
2450 If it's not, we should not be calling this function. */
2451 gcc_assert (asm_out_file);
2453 /* In a perfect world, the following condition would be true.
2454 Sadly, the Go front end emit assembly *from the front end*,
2455 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2457 /* This function should only be called if we are expanding, or have
2459 Ideally, only final.c would be calling this function, but it is
2460 not clear whether that would break things somehow. See PR 17982
2461 for further discussion. */
2462 gcc_assert (state == EXPANSION
2463 || state == FINISHED);
2466 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
2469 /* We want to output annotation for weak and external symbols at
2470 very last to check if they are references or not. */
2472 if (TARGET_SUPPORTS_WEAK
2474 /* TREE_STATIC is a weird and abused creature which is not
2475 generally the right test for whether an entity has been
2476 locally emitted, inlined or otherwise not-really-extern, but
2477 for declarations that can be weak, it happens to be
2479 && !TREE_STATIC (decl)
2480 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl))
2481 && value_member (decl, weak_decls) == NULL_TREE)
2482 weak_decls = tree_cons (NULL, decl, weak_decls);
2484 #ifdef ASM_OUTPUT_EXTERNAL
2485 if (pending_assemble_externals_processed)
2487 assemble_external_real (decl);
2491 if (! pending_assemble_externals_set->add (decl))
2492 pending_assemble_externals = tree_cons (NULL, decl,
2493 pending_assemble_externals);
2497 /* Similar, for calling a library function FUN. */
2500 assemble_external_libcall (rtx fun)
2502 /* Declare library function name external when first used, if nec. */
2503 if (! SYMBOL_REF_USED (fun))
2505 SYMBOL_REF_USED (fun) = 1;
2506 targetm.asm_out.external_libcall (fun);
2510 /* Assemble a label named NAME. */
2513 assemble_label (FILE *file, const char *name)
2515 ASM_OUTPUT_LABEL (file, name);
2518 /* Set the symbol_referenced flag for ID. */
2520 mark_referenced (tree id)
2522 TREE_SYMBOL_REFERENCED (id) = 1;
2525 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2527 mark_decl_referenced (tree decl)
2529 if (TREE_CODE (decl) == FUNCTION_DECL)
2531 /* Extern inline functions don't become needed when referenced.
2532 If we know a method will be emitted in other TU and no new
2533 functions can be marked reachable, just use the external
2535 struct cgraph_node *node = cgraph_node::get_create (decl);
2536 if (!DECL_EXTERNAL (decl)
2537 && !node->definition)
2538 node->mark_force_output ();
2540 else if (VAR_P (decl))
2542 varpool_node *node = varpool_node::get_create (decl);
2543 /* C++ frontend use mark_decl_references to force COMDAT variables
2544 to be output that might appear dead otherwise. */
2545 node->force_output = true;
2547 /* else do nothing - we can get various sorts of CST nodes here,
2548 which do not need to be marked. */
2552 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2553 starts with a *, the rest of NAME is output verbatim. Otherwise
2554 NAME is transformed in a target-specific way (usually by the
2555 addition of an underscore). */
2558 assemble_name_raw (FILE *file, const char *name)
2561 fputs (&name[1], file);
2563 ASM_OUTPUT_LABELREF (file, name);
2566 /* Like assemble_name_raw, but should be used when NAME might refer to
2567 an entity that is also represented as a tree (like a function or
2568 variable). If NAME does refer to such an entity, that entity will
2569 be marked as referenced. */
2572 assemble_name (FILE *file, const char *name)
2574 const char *real_name;
2577 real_name = targetm.strip_name_encoding (name);
2579 id = maybe_get_identifier (real_name);
2584 mark_referenced (id);
2585 ultimate_transparent_alias_target (&id);
2587 name = IDENTIFIER_POINTER (id);
2588 gcc_assert (! TREE_CHAIN (id));
2591 assemble_name_raw (file, name);
2594 /* Allocate SIZE bytes writable static space with a gensym name
2595 and return an RTX to refer to its address. */
2598 assemble_static_space (unsigned HOST_WIDE_INT size)
2601 const char *namestring;
2604 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2606 namestring = ggc_strdup (name);
2608 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2609 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2611 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2612 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2615 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2616 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2619 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2620 so that each uninitialized object starts on such a boundary. */
2621 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2622 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2623 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2624 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2625 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2626 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2633 /* Assemble the static constant template for function entry trampolines.
2634 This is done at most once per compilation.
2635 Returns an RTX for the address of the template. */
2637 static GTY(()) rtx initial_trampoline;
2640 assemble_trampoline_template (void)
2647 gcc_assert (targetm.asm_out.trampoline_template != NULL);
2649 if (initial_trampoline)
2650 return initial_trampoline;
2652 /* By default, put trampoline templates in read-only data section. */
2654 #ifdef TRAMPOLINE_SECTION
2655 switch_to_section (TRAMPOLINE_SECTION);
2657 switch_to_section (readonly_data_section);
2660 /* Write the assembler code to define one. */
2661 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2663 ASM_OUTPUT_ALIGN (asm_out_file, align);
2665 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2666 targetm.asm_out.trampoline_template (asm_out_file);
2668 /* Record the rtl to refer to it. */
2669 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2670 name = ggc_strdup (label);
2671 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2672 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2674 initial_trampoline = gen_const_mem (BLKmode, symbol);
2675 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2676 set_mem_size (initial_trampoline, TRAMPOLINE_SIZE);
2678 return initial_trampoline;
2681 /* A and B are either alignments or offsets. Return the minimum alignment
2682 that may be assumed after adding the two together. */
2684 static inline unsigned
2685 min_align (unsigned int a, unsigned int b)
2687 return least_bit_hwi (a | b);
2690 /* Return the assembler directive for creating a given kind of integer
2691 object. SIZE is the number of bytes in the object and ALIGNED_P
2692 indicates whether it is known to be aligned. Return NULL if the
2693 assembly dialect has no such directive.
2695 The returned string should be printed at the start of a new line and
2696 be followed immediately by the object's initial value. */
2699 integer_asm_op (int size, int aligned_p)
2701 struct asm_int_op *ops;
2704 ops = &targetm.asm_out.aligned_op;
2706 ops = &targetm.asm_out.unaligned_op;
2711 return targetm.asm_out.byte_op;
2725 /* Use directive OP to assemble an integer object X. Print OP at the
2726 start of the line, followed immediately by the value of X. */
2729 assemble_integer_with_op (const char *op, rtx x)
2731 fputs (op, asm_out_file);
2732 output_addr_const (asm_out_file, x);
2733 fputc ('\n', asm_out_file);
2736 /* The default implementation of the asm_out.integer target hook. */
2739 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2740 unsigned int size ATTRIBUTE_UNUSED,
2741 int aligned_p ATTRIBUTE_UNUSED)
2743 const char *op = integer_asm_op (size, aligned_p);
2744 /* Avoid GAS bugs for large values. Specifically negative values whose
2745 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2746 if (size > UNITS_PER_WORD && size > POINTER_SIZE_UNITS)
2748 return op && (assemble_integer_with_op (op, x), true);
2751 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2752 the alignment of the integer in bits. Return 1 if we were able to output
2753 the constant, otherwise 0. We must be able to output the constant,
2754 if FORCE is nonzero. */
2757 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2761 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2763 /* See if the target hook can handle this kind of object. */
2764 if (targetm.asm_out.integer (x, size, aligned_p))
2767 /* If the object is a multi-byte one, try splitting it up. Split
2768 it into words it if is multi-word, otherwise split it into bytes. */
2771 machine_mode omode, imode;
2772 unsigned int subalign;
2773 unsigned int subsize, i;
2774 enum mode_class mclass;
2776 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2777 subalign = MIN (align, subsize * BITS_PER_UNIT);
2778 if (GET_CODE (x) == CONST_FIXED)
2779 mclass = GET_MODE_CLASS (GET_MODE (x));
2783 omode = mode_for_size (subsize * BITS_PER_UNIT, mclass, 0);
2784 imode = mode_for_size (size * BITS_PER_UNIT, mclass, 0);
2786 for (i = 0; i < size; i += subsize)
2788 rtx partial = simplify_subreg (omode, x, imode, i);
2789 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2795 /* If we've printed some of it, but not all of it, there's no going
2800 gcc_assert (!force);
2805 /* Assemble the floating-point constant D into an object of size MODE. ALIGN
2806 is the alignment of the constant in bits. If REVERSE is true, D is output
2807 in reverse storage order. */
2810 assemble_real (REAL_VALUE_TYPE d, scalar_float_mode mode, unsigned int align,
2813 long data[4] = {0, 0, 0, 0};
2814 int bitsize, nelts, nunits, units_per;
2817 /* This is hairy. We have a quantity of known size. real_to_target
2818 will put it into an array of *host* longs, 32 bits per element
2819 (even if long is more than 32 bits). We need to determine the
2820 number of array elements that are occupied (nelts) and the number
2821 of *target* min-addressable units that will be occupied in the
2822 object file (nunits). We cannot assume that 32 divides the
2823 mode's bitsize (size * BITS_PER_UNIT) evenly.
2825 size * BITS_PER_UNIT is used here to make sure that padding bits
2826 (which might appear at either end of the value; real_to_target
2827 will include the padding bits in its output array) are included. */
2829 nunits = GET_MODE_SIZE (mode);
2830 bitsize = nunits * BITS_PER_UNIT;
2831 nelts = CEIL (bitsize, 32);
2832 units_per = 32 / BITS_PER_UNIT;
2834 real_to_target (data, &d, mode);
2836 /* Put out the first word with the specified alignment. */
2838 elt = flip_storage_order (SImode, gen_int_mode (data[nelts - 1], SImode));
2840 elt = GEN_INT (data[0]);
2841 assemble_integer (elt, MIN (nunits, units_per), align, 1);
2842 nunits -= units_per;
2844 /* Subsequent words need only 32-bit alignment. */
2845 align = min_align (align, 32);
2847 for (int i = 1; i < nelts; i++)
2850 elt = flip_storage_order (SImode,
2851 gen_int_mode (data[nelts - 1 - i], SImode));
2853 elt = GEN_INT (data[i]);
2854 assemble_integer (elt, MIN (nunits, units_per), align, 1);
2855 nunits -= units_per;
2859 /* Given an expression EXP with a constant value,
2860 reduce it to the sum of an assembler symbol and an integer.
2861 Store them both in the structure *VALUE.
2862 EXP must be reducible. */
2866 HOST_WIDE_INT offset;
2870 decode_addr_const (tree exp, struct addr_const *value)
2872 tree target = TREE_OPERAND (exp, 0);
2878 if (TREE_CODE (target) == COMPONENT_REF
2879 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target, 1))))
2881 offset += int_byte_position (TREE_OPERAND (target, 1));
2882 target = TREE_OPERAND (target, 0);
2884 else if (TREE_CODE (target) == ARRAY_REF
2885 || TREE_CODE (target) == ARRAY_RANGE_REF)
2887 offset += (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target)))
2888 * tree_to_shwi (TREE_OPERAND (target, 1)));
2889 target = TREE_OPERAND (target, 0);
2891 else if (TREE_CODE (target) == MEM_REF
2892 && TREE_CODE (TREE_OPERAND (target, 0)) == ADDR_EXPR)
2894 offset += mem_ref_offset (target).to_short_addr ();
2895 target = TREE_OPERAND (TREE_OPERAND (target, 0), 0);
2897 else if (TREE_CODE (target) == INDIRECT_REF
2898 && TREE_CODE (TREE_OPERAND (target, 0)) == NOP_EXPR
2899 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target, 0), 0))
2901 target = TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target, 0), 0), 0);
2906 switch (TREE_CODE (target))
2910 x = DECL_RTL (target);
2914 x = gen_rtx_MEM (FUNCTION_MODE,
2915 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2924 x = output_constant_def (target, 1);
2931 gcc_assert (MEM_P (x));
2935 value->offset = offset;
2938 static GTY(()) hash_table<tree_descriptor_hasher> *const_desc_htab;
2940 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2942 /* Constant pool accessor function. */
2944 hash_table<tree_descriptor_hasher> *
2945 constant_pool_htab (void)
2947 return const_desc_htab;
2950 /* Compute a hash code for a constant expression. */
2953 tree_descriptor_hasher::hash (constant_descriptor_tree *ptr)
2959 const_hash_1 (const tree exp)
2964 enum tree_code code = TREE_CODE (exp);
2966 /* Either set P and LEN to the address and len of something to hash and
2967 exit the switch or return a value. */
2972 p = (char *) &TREE_INT_CST_ELT (exp, 0);
2973 len = TREE_INT_CST_NUNITS (exp) * sizeof (HOST_WIDE_INT);
2977 return real_hash (TREE_REAL_CST_PTR (exp));
2980 return fixed_hash (TREE_FIXED_CST_PTR (exp));
2983 p = TREE_STRING_POINTER (exp);
2984 len = TREE_STRING_LENGTH (exp);
2988 return (const_hash_1 (TREE_REALPART (exp)) * 5
2989 + const_hash_1 (TREE_IMAGPART (exp)));
2995 hi = 7 + VECTOR_CST_NELTS (exp);
2997 for (i = 0; i < VECTOR_CST_NELTS (exp); ++i)
2998 hi = hi * 563 + const_hash_1 (VECTOR_CST_ELT (exp, i));
3005 unsigned HOST_WIDE_INT idx;
3008 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
3010 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
3012 hi = hi * 603 + const_hash_1 (value);
3020 struct addr_const value;
3022 decode_addr_const (exp, &value);
3023 switch (GET_CODE (value.base))
3026 /* Don't hash the address of the SYMBOL_REF;
3027 only use the offset and the symbol name. */
3029 p = XSTR (value.base, 0);
3030 for (i = 0; p[i] != 0; i++)
3031 hi = ((hi * 613) + (unsigned) (p[i]));
3036 + CODE_LABEL_NUMBER (label_ref_label (value.base)) * 13);
3046 case POINTER_PLUS_EXPR:
3048 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
3049 + const_hash_1 (TREE_OPERAND (exp, 1)));
3052 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
3055 /* A language specific constant. Just hash the code. */
3059 /* Compute hashing function. */
3061 for (i = 0; i < len; i++)
3062 hi = ((hi * 613) + (unsigned) (p[i]));
3067 /* Wrapper of compare_constant, for the htab interface. */
3069 tree_descriptor_hasher::equal (constant_descriptor_tree *c1,
3070 constant_descriptor_tree *c2)
3072 if (c1->hash != c2->hash)
3074 return compare_constant (c1->value, c2->value);
3077 /* Compare t1 and t2, and return 1 only if they are known to result in
3078 the same bit pattern on output. */
3081 compare_constant (const tree t1, const tree t2)
3083 enum tree_code typecode;
3085 if (t1 == NULL_TREE)
3086 return t2 == NULL_TREE;
3087 if (t2 == NULL_TREE)
3090 if (TREE_CODE (t1) != TREE_CODE (t2))
3093 switch (TREE_CODE (t1))
3096 /* Integer constants are the same only if the same width of type. */
3097 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
3099 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
3101 return tree_int_cst_equal (t1, t2);
3104 /* Real constants are the same only if the same width of type. */
3105 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
3108 return real_identical (&TREE_REAL_CST (t1), &TREE_REAL_CST (t2));
3111 /* Fixed constants are the same only if the same width of type. */
3112 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
3115 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));
3118 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
3121 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
3122 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
3123 TREE_STRING_LENGTH (t1)));
3126 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
3127 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
3133 if (VECTOR_CST_NELTS (t1) != VECTOR_CST_NELTS (t2))
3136 for (i = 0; i < VECTOR_CST_NELTS (t1); ++i)
3137 if (!compare_constant (VECTOR_CST_ELT (t1, i),
3138 VECTOR_CST_ELT (t2, i)))
3146 vec<constructor_elt, va_gc> *v1, *v2;
3147 unsigned HOST_WIDE_INT idx;
3149 typecode = TREE_CODE (TREE_TYPE (t1));
3150 if (typecode != TREE_CODE (TREE_TYPE (t2)))
3153 if (typecode == ARRAY_TYPE)
3155 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
3156 /* For arrays, check that mode, size and storage order match. */
3157 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
3159 || size_1 != int_size_in_bytes (TREE_TYPE (t2))
3160 || TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t1))
3161 != TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t2)))
3166 /* For record and union constructors, require exact type
3168 if (TREE_TYPE (t1) != TREE_TYPE (t2))
3172 v1 = CONSTRUCTOR_ELTS (t1);
3173 v2 = CONSTRUCTOR_ELTS (t2);
3174 if (vec_safe_length (v1) != vec_safe_length (v2))
3177 for (idx = 0; idx < vec_safe_length (v1); ++idx)
3179 constructor_elt *c1 = &(*v1)[idx];
3180 constructor_elt *c2 = &(*v2)[idx];
3182 /* Check that each value is the same... */
3183 if (!compare_constant (c1->value, c2->value))
3185 /* ... and that they apply to the same fields! */
3186 if (typecode == ARRAY_TYPE)
3188 if (!compare_constant (c1->index, c2->index))
3193 if (c1->index != c2->index)
3204 struct addr_const value1, value2;
3208 decode_addr_const (t1, &value1);
3209 decode_addr_const (t2, &value2);
3211 if (value1.offset != value2.offset)
3214 code = GET_CODE (value1.base);
3215 if (code != GET_CODE (value2.base))
3221 ret = (strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
3225 ret = (CODE_LABEL_NUMBER (label_ref_label (value1.base))
3226 == CODE_LABEL_NUMBER (label_ref_label (value2.base)));
3236 case POINTER_PLUS_EXPR:
3239 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
3240 && compare_constant (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
3243 case VIEW_CONVERT_EXPR:
3244 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3253 /* Return the section into which constant EXP should be placed. */
3256 get_constant_section (tree exp, unsigned int align)
3258 return targetm.asm_out.select_section (exp,
3259 compute_reloc_for_constant (exp),
3263 /* Return the size of constant EXP in bytes. */
3265 static HOST_WIDE_INT
3266 get_constant_size (tree exp)
3270 size = int_size_in_bytes (TREE_TYPE (exp));
3271 if (TREE_CODE (exp) == STRING_CST)
3272 size = MAX (TREE_STRING_LENGTH (exp), size);
3276 /* Subroutine of output_constant_def:
3277 No constant equal to EXP is known to have been output.
3278 Make a constant descriptor to enter EXP in the hash table.
3279 Assign the label number and construct RTL to refer to the
3280 constant's location in memory.
3281 Caller is responsible for updating the hash table. */
3283 static struct constant_descriptor_tree *
3284 build_constant_desc (tree exp)
3286 struct constant_descriptor_tree *desc;
3292 desc = ggc_alloc<constant_descriptor_tree> ();
3295 /* Create a string containing the label name, in LABEL. */
3296 labelno = const_labelno++;
3297 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
3299 /* Construct the VAR_DECL associated with the constant. */
3300 decl = build_decl (UNKNOWN_LOCATION, VAR_DECL, get_identifier (label),
3302 DECL_ARTIFICIAL (decl) = 1;
3303 DECL_IGNORED_P (decl) = 1;
3304 TREE_READONLY (decl) = 1;
3305 TREE_STATIC (decl) = 1;
3306 TREE_ADDRESSABLE (decl) = 1;
3307 /* We don't set the RTL yet as this would cause varpool to assume that the
3308 variable is referenced. Moreover, it would just be dropped in LTO mode.
3309 Instead we set the flag that will be recognized in make_decl_rtl. */
3310 DECL_IN_CONSTANT_POOL (decl) = 1;
3311 DECL_INITIAL (decl) = desc->value;
3312 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3313 architectures so use DATA_ALIGNMENT as well, except for strings. */
3314 if (TREE_CODE (exp) == STRING_CST)
3316 SET_DECL_ALIGN (decl, CONSTANT_ALIGNMENT (exp, DECL_ALIGN (decl)));
3319 align_variable (decl, 0);
3321 /* Now construct the SYMBOL_REF and the MEM. */
3322 if (use_object_blocks_p ())
3324 int align = (TREE_CODE (decl) == CONST_DECL
3325 || (VAR_P (decl) && DECL_IN_CONSTANT_POOL (decl))
3327 : symtab_node::get (decl)->definition_alignment ());
3328 section *sect = get_constant_section (exp, align);
3329 symbol = create_block_symbol (ggc_strdup (label),
3330 get_block_for_section (sect), -1);
3333 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3334 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3335 SET_SYMBOL_REF_DECL (symbol, decl);
3336 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3338 rtl = gen_const_mem (TYPE_MODE (TREE_TYPE (exp)), symbol);
3339 set_mem_attributes (rtl, exp, 1);
3340 set_mem_alias_set (rtl, 0);
3342 /* Putting EXP into the literal pool might have imposed a different
3343 alignment which should be visible in the RTX as well. */
3344 set_mem_align (rtl, DECL_ALIGN (decl));
3346 /* We cannot share RTX'es in pool entries.
3347 Mark this piece of RTL as required for unsharing. */
3348 RTX_FLAG (rtl, used) = 1;
3350 /* Set flags or add text to the name to record information, such as
3351 that it is a local symbol. If the name is changed, the macro
3352 ASM_OUTPUT_LABELREF will have to know how to strip this
3353 information. This call might invalidate our local variable
3354 SYMBOL; we can't use it afterward. */
3355 targetm.encode_section_info (exp, rtl, true);
3362 /* Return an rtx representing a reference to constant data in memory
3363 for the constant expression EXP.
3365 If assembler code for such a constant has already been output,
3366 return an rtx to refer to it.
3367 Otherwise, output such a constant in memory
3368 and generate an rtx for it.
3370 If DEFER is nonzero, this constant can be deferred and output only
3371 if referenced in the function after all optimizations.
3373 `const_desc_table' records which constants already have label strings. */
3376 output_constant_def (tree exp, int defer)
3378 struct constant_descriptor_tree *desc;
3379 struct constant_descriptor_tree key;
3381 /* Look up EXP in the table of constant descriptors. If we didn't find
3382 it, create a new one. */
3384 key.hash = const_hash_1 (exp);
3385 constant_descriptor_tree **loc
3386 = const_desc_htab->find_slot_with_hash (&key, key.hash, INSERT);
3391 desc = build_constant_desc (exp);
3392 desc->hash = key.hash;
3396 maybe_output_constant_def_contents (desc, defer);
3400 /* Subroutine of output_constant_def: Decide whether or not we need to
3401 output the constant DESC now, and if so, do it. */
3403 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
3406 rtx symbol = XEXP (desc->rtl, 0);
3407 tree exp = desc->value;
3409 if (flag_syntax_only)
3412 if (TREE_ASM_WRITTEN (exp))
3413 /* Already output; don't do it again. */
3416 /* We can always defer constants as long as the context allows
3420 /* Increment n_deferred_constants if it exists. It needs to be at
3421 least as large as the number of constants actually referred to
3422 by the function. If it's too small we'll stop looking too early
3423 and fail to emit constants; if it's too large we'll only look
3424 through the entire function when we could have stopped earlier. */
3426 n_deferred_constants++;
3430 output_constant_def_contents (symbol);
3433 /* Subroutine of output_constant_def_contents. Output the definition
3434 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3435 constant's alignment in bits. */
3438 assemble_constant_contents (tree exp, const char *label, unsigned int align)
3442 size = get_constant_size (exp);
3444 /* Do any machine/system dependent processing of the constant. */
3445 targetm.asm_out.declare_constant_name (asm_out_file, label, exp, size);
3447 /* Output the value of EXP. */
3448 output_constant (exp, size, align, false);
3450 targetm.asm_out.decl_end ();
3453 /* We must output the constant data referred to by SYMBOL; do so. */
3456 output_constant_def_contents (rtx symbol)
3458 tree decl = SYMBOL_REF_DECL (symbol);
3459 tree exp = DECL_INITIAL (decl);
3460 bool asan_protected = false;
3462 /* Make sure any other constants whose addresses appear in EXP
3463 are assigned label numbers. */
3464 output_addressed_constants (exp);
3466 /* We are no longer deferring this constant. */
3467 TREE_ASM_WRITTEN (decl) = TREE_ASM_WRITTEN (exp) = 1;
3469 if ((flag_sanitize & SANITIZE_ADDRESS)
3470 && TREE_CODE (exp) == STRING_CST
3471 && asan_protect_global (exp))
3473 asan_protected = true;
3474 SET_DECL_ALIGN (decl, MAX (DECL_ALIGN (decl),
3475 ASAN_RED_ZONE_SIZE * BITS_PER_UNIT));
3478 /* If the constant is part of an object block, make sure that the
3479 decl has been positioned within its block, but do not write out
3480 its definition yet. output_object_blocks will do that later. */
3481 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
3482 place_block_symbol (symbol);
3485 int align = (TREE_CODE (decl) == CONST_DECL
3486 || (VAR_P (decl) && DECL_IN_CONSTANT_POOL (decl))
3488 : symtab_node::get (decl)->definition_alignment ());
3489 switch_to_section (get_constant_section (exp, align));
3490 if (align > BITS_PER_UNIT)
3491 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
3492 assemble_constant_contents (exp, XSTR (symbol, 0), align);
3495 HOST_WIDE_INT size = get_constant_size (exp);
3496 assemble_zeros (asan_red_zone_size (size));
3501 /* Look up EXP in the table of constant descriptors. Return the rtl
3502 if it has been emitted, else null. */
3505 lookup_constant_def (tree exp)
3507 struct constant_descriptor_tree key;
3510 key.hash = const_hash_1 (exp);
3511 constant_descriptor_tree *desc
3512 = const_desc_htab->find_with_hash (&key, key.hash);
3514 return (desc ? desc->rtl : NULL_RTX);
3517 /* Return a tree representing a reference to constant data in memory
3518 for the constant expression EXP.
3520 This is the counterpart of output_constant_def at the Tree level. */
3523 tree_output_constant_def (tree exp)
3525 struct constant_descriptor_tree *desc, key;
3528 /* Look up EXP in the table of constant descriptors. If we didn't find
3529 it, create a new one. */
3531 key.hash = const_hash_1 (exp);
3532 constant_descriptor_tree **loc
3533 = const_desc_htab->find_slot_with_hash (&key, key.hash, INSERT);
3538 desc = build_constant_desc (exp);
3539 desc->hash = key.hash;
3543 decl = SYMBOL_REF_DECL (XEXP (desc->rtl, 0));
3544 varpool_node::finalize_decl (decl);
3548 struct GTY((chain_next ("%h.next"), for_user)) constant_descriptor_rtx {
3549 struct constant_descriptor_rtx *next;
3553 HOST_WIDE_INT offset;
3561 struct const_rtx_desc_hasher : ggc_ptr_hash<constant_descriptor_rtx>
3563 static hashval_t hash (constant_descriptor_rtx *);
3564 static bool equal (constant_descriptor_rtx *, constant_descriptor_rtx *);
3567 /* Used in the hash tables to avoid outputting the same constant
3568 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3569 are output once per function, not once per file. */
3570 /* ??? Only a few targets need per-function constant pools. Most
3571 can use one per-file pool. Should add a targetm bit to tell the
3574 struct GTY(()) rtx_constant_pool {
3575 /* Pointers to first and last constant in pool, as ordered by offset. */
3576 struct constant_descriptor_rtx *first;
3577 struct constant_descriptor_rtx *last;
3579 /* Hash facility for making memory-constants from constant rtl-expressions.
3580 It is used on RISC machines where immediate integer arguments and
3581 constant addresses are restricted so that such constants must be stored
3583 hash_table<const_rtx_desc_hasher> *const_rtx_htab;
3585 /* Current offset in constant pool (does not include any
3586 machine-specific header). */
3587 HOST_WIDE_INT offset;
3590 /* Hash and compare functions for const_rtx_htab. */
3593 const_rtx_desc_hasher::hash (constant_descriptor_rtx *desc)
3599 const_rtx_desc_hasher::equal (constant_descriptor_rtx *x,
3600 constant_descriptor_rtx *y)
3602 if (x->mode != y->mode)
3604 return rtx_equal_p (x->constant, y->constant);
3607 /* Hash one component of a constant. */
3610 const_rtx_hash_1 (const_rtx x)
3612 unsigned HOST_WIDE_INT hwi;
3618 code = GET_CODE (x);
3619 mode = GET_MODE (x);
3620 h = (hashval_t) code * 1048573 + mode;
3629 int shift = sizeof (hashval_t) * CHAR_BIT;
3630 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3632 h ^= (hashval_t) hwi;
3633 for (i = 1; i < n; ++i)
3636 h ^= (hashval_t) hwi;
3641 case CONST_WIDE_INT:
3644 for (i = 0; i < CONST_WIDE_INT_NUNITS (x); i++)
3645 hwi ^= CONST_WIDE_INT_ELT (x, i);
3650 if (TARGET_SUPPORTS_WIDE_INT == 0 && mode == VOIDmode)
3652 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3656 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3660 h ^= fixed_hash (CONST_FIXED_VALUE (x));
3664 h ^= htab_hash_string (XSTR (x, 0));
3668 h = h * 251 + CODE_LABEL_NUMBER (label_ref_label (x));
3672 case UNSPEC_VOLATILE:
3673 h = h * 251 + XINT (x, 1);
3683 /* Compute a hash value for X, which should be a constant. */
3686 const_rtx_hash (rtx x)
3689 subrtx_iterator::array_type array;
3690 FOR_EACH_SUBRTX (iter, array, x, ALL)
3691 h = h * 509 + const_rtx_hash_1 (*iter);
3696 /* Create and return a new rtx constant pool. */
3698 static struct rtx_constant_pool *
3699 create_constant_pool (void)
3701 struct rtx_constant_pool *pool;
3703 pool = ggc_alloc<rtx_constant_pool> ();
3704 pool->const_rtx_htab = hash_table<const_rtx_desc_hasher>::create_ggc (31);
3711 /* Initialize constant pool hashing for a new function. */
3714 init_varasm_status (void)
3716 crtl->varasm.pool = create_constant_pool ();
3717 crtl->varasm.deferred_constants = 0;
3720 /* Given a MINUS expression, simplify it if both sides
3721 include the same symbol. */
3724 simplify_subtraction (rtx x)
3726 rtx r = simplify_rtx (x);
3730 /* Given a constant rtx X, make (or find) a memory constant for its value
3731 and return a MEM rtx to refer to it in memory. */
3734 force_const_mem (machine_mode mode, rtx x)
3736 struct constant_descriptor_rtx *desc, tmp;
3737 struct rtx_constant_pool *pool;
3742 constant_descriptor_rtx **slot;
3744 /* If we're not allowed to drop X into the constant pool, don't. */
3745 if (targetm.cannot_force_const_mem (mode, x))
3748 /* Record that this function has used a constant pool entry. */
3749 crtl->uses_const_pool = 1;
3751 /* Decide which pool to use. */
3752 pool = (targetm.use_blocks_for_constant_p (mode, x)
3753 ? shared_constant_pool
3754 : crtl->varasm.pool);
3756 /* Lookup the value in the hashtable. */
3759 hash = const_rtx_hash (x);
3760 slot = pool->const_rtx_htab->find_slot_with_hash (&tmp, hash, INSERT);
3763 /* If the constant was already present, return its memory. */
3765 return copy_rtx (desc->mem);
3767 /* Otherwise, create a new descriptor. */
3768 desc = ggc_alloc<constant_descriptor_rtx> ();
3771 /* Align the location counter as required by EXP's data type. */
3772 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3774 tree type = lang_hooks.types.type_for_mode (mode, 0);
3775 if (type != NULL_TREE)
3776 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3778 pool->offset += (align / BITS_PER_UNIT) - 1;
3779 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3782 desc->constant = copy_rtx (tmp.constant);
3783 desc->offset = pool->offset;
3786 desc->align = align;
3787 desc->labelno = const_labelno;
3790 pool->offset += GET_MODE_SIZE (mode);
3792 pool->last->next = desc;
3794 pool->first = pool->last = desc;
3797 /* Create a string containing the label name, in LABEL. */
3798 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3801 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3802 the constants pool. */
3803 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3805 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3806 symbol = create_block_symbol (ggc_strdup (label),
3807 get_block_for_section (sect), -1);
3810 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3812 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3813 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3814 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3816 /* Construct the MEM. */
3817 desc->mem = def = gen_const_mem (mode, symbol);
3818 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3819 set_mem_align (def, align);
3821 /* If we're dropping a label to the constant pool, make sure we
3823 if (GET_CODE (x) == LABEL_REF)
3824 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3826 return copy_rtx (def);
3829 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3832 get_pool_constant (const_rtx addr)
3834 return SYMBOL_REF_CONSTANT (addr)->constant;
3837 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3838 and whether it has been output or not. */
3841 get_pool_constant_mark (rtx addr, bool *pmarked)
3843 struct constant_descriptor_rtx *desc;
3845 desc = SYMBOL_REF_CONSTANT (addr);
3846 *pmarked = (desc->mark != 0);
3847 return desc->constant;
3850 /* Similar, return the mode. */
3853 get_pool_mode (const_rtx addr)
3855 return SYMBOL_REF_CONSTANT (addr)->mode;
3858 /* Return TRUE if and only if the constant pool has no entries. Note
3859 that even entries we might end up choosing not to emit are counted
3860 here, so there is the potential for missed optimizations. */
3863 constant_pool_empty_p (void)
3865 return crtl->varasm.pool->first == NULL;
3868 /* Worker function for output_constant_pool_1. Emit assembly for X
3869 in MODE with known alignment ALIGN. */
3872 output_constant_pool_2 (machine_mode mode, rtx x, unsigned int align)
3874 switch (GET_MODE_CLASS (mode))
3877 case MODE_DECIMAL_FLOAT:
3879 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x));
3880 assemble_real (*CONST_DOUBLE_REAL_VALUE (x),
3881 as_a <scalar_float_mode> (mode), align, false);
3886 case MODE_PARTIAL_INT:
3891 case MODE_POINTER_BOUNDS:
3892 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3895 case MODE_VECTOR_FLOAT:
3896 case MODE_VECTOR_INT:
3897 case MODE_VECTOR_FRACT:
3898 case MODE_VECTOR_UFRACT:
3899 case MODE_VECTOR_ACCUM:
3900 case MODE_VECTOR_UACCUM:
3903 machine_mode submode = GET_MODE_INNER (mode);
3904 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3906 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3907 units = CONST_VECTOR_NUNITS (x);
3909 for (i = 0; i < units; i++)
3911 rtx elt = CONST_VECTOR_ELT (x, i);
3912 output_constant_pool_2 (submode, elt, i ? subalign : align);
3922 /* Worker function for output_constant_pool. Emit constant DESC,
3923 giving it ALIGN bits of alignment. */
3926 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3933 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3934 whose CODE_LABEL has been deleted. This can occur if a jump table
3935 is eliminated by optimization. If so, write a constant of zero
3936 instead. Note that this can also happen by turning the
3937 CODE_LABEL into a NOTE. */
3938 /* ??? This seems completely and utterly wrong. Certainly it's
3939 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3940 functioning even with rtx_insn::deleted and friends. */
3943 switch (GET_CODE (tmp))
3946 if (GET_CODE (XEXP (tmp, 0)) != PLUS
3947 || GET_CODE (XEXP (XEXP (tmp, 0), 0)) != LABEL_REF)
3949 tmp = XEXP (XEXP (tmp, 0), 0);
3954 rtx_insn *insn = label_ref_label (tmp);
3955 gcc_assert (!insn->deleted ());
3956 gcc_assert (!NOTE_P (insn)
3957 || NOTE_KIND (insn) != NOTE_INSN_DELETED);
3965 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3966 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3967 align, desc->labelno, done);
3970 assemble_align (align);
3972 /* Output the label. */
3973 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3976 Pass actual alignment value while emitting string constant to asm code
3977 as function 'output_constant_pool_1' explicitly passes the alignment as 1
3978 assuming that the data is already aligned which prevents the generation
3979 of fix-up table entries. */
3980 output_constant_pool_2 (desc->mode, x, desc->align);
3982 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3983 sections have proper size. */
3984 if (align > GET_MODE_BITSIZE (desc->mode)
3986 && (in_section->common.flags & SECTION_MERGE))
3987 assemble_align (align);
3989 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3995 /* Recompute the offsets of entries in POOL, and the overall size of
3996 POOL. Do this after calling mark_constant_pool to ensure that we
3997 are computing the offset values for the pool which we will actually
4001 recompute_pool_offsets (struct rtx_constant_pool *pool)
4003 struct constant_descriptor_rtx *desc;
4006 for (desc = pool->first; desc ; desc = desc->next)
4009 /* Recalculate offset. */
4010 unsigned int align = desc->align;
4011 pool->offset += (align / BITS_PER_UNIT) - 1;
4012 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
4013 desc->offset = pool->offset;
4014 pool->offset += GET_MODE_SIZE (desc->mode);
4018 /* Mark all constants that are referenced by SYMBOL_REFs in X.
4019 Emit referenced deferred strings. */
4022 mark_constants_in_pattern (rtx insn)
4024 subrtx_iterator::array_type array;
4025 FOR_EACH_SUBRTX (iter, array, PATTERN (insn), ALL)
4027 const_rtx x = *iter;
4028 if (GET_CODE (x) == SYMBOL_REF)
4030 if (CONSTANT_POOL_ADDRESS_P (x))
4032 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
4033 if (desc->mark == 0)
4036 iter.substitute (desc->constant);
4039 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
4041 tree decl = SYMBOL_REF_DECL (x);
4042 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl)))
4044 n_deferred_constants--;
4045 output_constant_def_contents (CONST_CAST_RTX (x));
4052 /* Look through appropriate parts of INSN, marking all entries in the
4053 constant pool which are actually being used. Entries that are only
4054 referenced by other constants are also marked as used. Emit
4055 deferred strings that are used. */
4058 mark_constants (rtx_insn *insn)
4063 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4064 insns, not any notes that may be attached. We don't want to mark
4065 a constant just because it happens to appear in a REG_EQUIV note. */
4066 if (rtx_sequence *seq = dyn_cast <rtx_sequence *> (PATTERN (insn)))
4068 int i, n = seq->len ();
4069 for (i = 0; i < n; ++i)
4071 rtx subinsn = seq->element (i);
4072 if (INSN_P (subinsn))
4073 mark_constants_in_pattern (subinsn);
4077 mark_constants_in_pattern (insn);
4080 /* Look through the instructions for this function, and mark all the
4081 entries in POOL which are actually being used. Emit deferred constants
4082 which have indeed been used. */
4085 mark_constant_pool (void)
4089 if (!crtl->uses_const_pool && n_deferred_constants == 0)
4092 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
4093 mark_constants (insn);
4096 /* Write all the constants in POOL. */
4099 output_constant_pool_contents (struct rtx_constant_pool *pool)
4101 struct constant_descriptor_rtx *desc;
4103 for (desc = pool->first; desc ; desc = desc->next)
4106 /* If the constant is part of an object_block, make sure that
4107 the constant has been positioned within its block, but do not
4108 write out its definition yet. output_object_blocks will do
4110 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
4111 && SYMBOL_REF_BLOCK (desc->sym))
4112 place_block_symbol (desc->sym);
4115 switch_to_section (targetm.asm_out.select_rtx_section
4116 (desc->mode, desc->constant, desc->align));
4117 output_constant_pool_1 (desc, desc->align);
4122 /* Mark all constants that are used in the current function, then write
4123 out the function's private constant pool. */
4126 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
4127 tree fndecl ATTRIBUTE_UNUSED)
4129 struct rtx_constant_pool *pool = crtl->varasm.pool;
4131 /* It is possible for gcc to call force_const_mem and then to later
4132 discard the instructions which refer to the constant. In such a
4133 case we do not need to output the constant. */
4134 mark_constant_pool ();
4136 /* Having marked the constant pool entries we'll actually emit, we
4137 now need to rebuild the offset information, which may have become
4139 recompute_pool_offsets (pool);
4141 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4142 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
4145 output_constant_pool_contents (pool);
4147 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4148 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
4152 /* Write the contents of the shared constant pool. */
4155 output_shared_constant_pool (void)
4157 output_constant_pool_contents (shared_constant_pool);
4160 /* Determine what kind of relocations EXP may need. */
4163 compute_reloc_for_constant (tree exp)
4165 int reloc = 0, reloc2;
4168 switch (TREE_CODE (exp))
4172 /* Go inside any operations that get_inner_reference can handle and see
4173 if what's inside is a constant: no need to do anything here for
4174 addresses of variables or functions. */
4175 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
4176 tem = TREE_OPERAND (tem, 0))
4179 if (TREE_CODE (tem) == MEM_REF
4180 && TREE_CODE (TREE_OPERAND (tem, 0)) == ADDR_EXPR)
4182 reloc = compute_reloc_for_constant (TREE_OPERAND (tem, 0));
4186 if (!targetm.binds_local_p (tem))
4193 case POINTER_PLUS_EXPR:
4194 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4195 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
4199 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4200 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
4201 /* The difference of two local labels is computable at link time. */
4202 if (reloc == 1 && reloc2 == 1)
4209 case VIEW_CONVERT_EXPR:
4210 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4215 unsigned HOST_WIDE_INT idx;
4216 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4218 reloc |= compute_reloc_for_constant (tem);
4228 /* Find all the constants whose addresses are referenced inside of EXP,
4229 and make sure assembler code with a label has been output for each one.
4230 Indicate whether an ADDR_EXPR has been encountered. */
4233 output_addressed_constants (tree exp)
4237 switch (TREE_CODE (exp))
4241 /* Go inside any operations that get_inner_reference can handle and see
4242 if what's inside is a constant: no need to do anything here for
4243 addresses of variables or functions. */
4244 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
4245 tem = TREE_OPERAND (tem, 0))
4248 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4249 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
4250 tem = DECL_INITIAL (tem);
4252 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
4253 output_constant_def (tem, 0);
4255 if (TREE_CODE (tem) == MEM_REF)
4256 output_addressed_constants (TREE_OPERAND (tem, 0));
4260 case POINTER_PLUS_EXPR:
4262 output_addressed_constants (TREE_OPERAND (exp, 1));
4266 case VIEW_CONVERT_EXPR:
4267 output_addressed_constants (TREE_OPERAND (exp, 0));
4272 unsigned HOST_WIDE_INT idx;
4273 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4275 output_addressed_constants (tem);
4284 /* Whether a constructor CTOR is a valid static constant initializer if all
4285 its elements are. This used to be internal to initializer_constant_valid_p
4286 and has been exposed to let other functions like categorize_ctor_elements
4287 evaluate the property while walking a constructor for other purposes. */
4290 constructor_static_from_elts_p (const_tree ctor)
4292 return (TREE_CONSTANT (ctor)
4293 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4294 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE
4295 || TREE_CODE (TREE_TYPE (ctor)) == ARRAY_TYPE));
4298 static tree initializer_constant_valid_p_1 (tree value, tree endtype,
4301 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4302 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4303 which are valid when ENDTYPE is an integer of any size; in
4304 particular, this does not accept a pointer minus a constant. This
4305 returns null_pointer_node if the VALUE is an absolute constant
4306 which can be used to initialize a static variable. Otherwise it
4310 narrowing_initializer_constant_valid_p (tree value, tree endtype, tree *cache)
4314 if (!INTEGRAL_TYPE_P (endtype))
4317 op0 = TREE_OPERAND (value, 0);
4318 op1 = TREE_OPERAND (value, 1);
4320 /* Like STRIP_NOPS except allow the operand mode to widen. This
4321 works around a feature of fold that simplifies (int)(p1 - p2) to
4322 ((int)p1 - (int)p2) under the theory that the narrower operation
4325 while (CONVERT_EXPR_P (op0)
4326 || TREE_CODE (op0) == NON_LVALUE_EXPR)
4328 tree inner = TREE_OPERAND (op0, 0);
4329 if (inner == error_mark_node
4330 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4331 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op0)))
4332 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner)))))
4337 while (CONVERT_EXPR_P (op1)
4338 || TREE_CODE (op1) == NON_LVALUE_EXPR)
4340 tree inner = TREE_OPERAND (op1, 0);
4341 if (inner == error_mark_node
4342 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4343 || (GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (op1)))
4344 > GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (TREE_TYPE (inner)))))
4349 op0 = initializer_constant_valid_p_1 (op0, endtype, cache);
4353 op1 = initializer_constant_valid_p_1 (op1, endtype,
4354 cache ? cache + 2 : NULL);
4355 /* Both initializers must be known. */
4359 && (op0 == null_pointer_node
4360 || TREE_CODE (value) == MINUS_EXPR))
4361 return null_pointer_node;
4363 /* Support differences between labels. */
4364 if (TREE_CODE (op0) == LABEL_DECL
4365 && TREE_CODE (op1) == LABEL_DECL)
4366 return null_pointer_node;
4368 if (TREE_CODE (op0) == STRING_CST
4369 && TREE_CODE (op1) == STRING_CST
4370 && operand_equal_p (op0, op1, 1))
4371 return null_pointer_node;
4377 /* Helper function of initializer_constant_valid_p.
4378 Return nonzero if VALUE is a valid constant-valued expression
4379 for use in initializing a static variable; one that can be an
4380 element of a "constant" initializer.
4382 Return null_pointer_node if the value is absolute;
4383 if it is relocatable, return the variable that determines the relocation.
4384 We assume that VALUE has been folded as much as possible;
4385 therefore, we do not need to check for such things as
4386 arithmetic-combinations of integers.
4388 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4391 initializer_constant_valid_p_1 (tree value, tree endtype, tree *cache)
4395 switch (TREE_CODE (value))
4398 if (constructor_static_from_elts_p (value))
4400 unsigned HOST_WIDE_INT idx;
4402 bool absolute = true;
4404 if (cache && cache[0] == value)
4406 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4409 reloc = initializer_constant_valid_p_1 (elt, TREE_TYPE (elt),
4412 /* An absolute value is required with reverse SSO. */
4413 || (reloc != null_pointer_node
4414 && TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (value))
4415 && !AGGREGATE_TYPE_P (TREE_TYPE (elt))))
4420 cache[1] = NULL_TREE;
4424 if (reloc != null_pointer_node)
4427 /* For a non-absolute relocation, there is no single
4428 variable that can be "the variable that determines the
4433 cache[1] = absolute ? null_pointer_node : error_mark_node;
4435 return absolute ? null_pointer_node : error_mark_node;
4438 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
4446 return null_pointer_node;
4451 tree op0 = staticp (TREE_OPERAND (value, 0));
4454 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4455 to be a constant, this is old-skool offsetof-like nonsense. */
4456 if (TREE_CODE (op0) == INDIRECT_REF
4457 && TREE_CONSTANT (TREE_OPERAND (op0, 0)))
4458 return null_pointer_node;
4459 /* Taking the address of a nested function involves a trampoline,
4460 unless we don't need or want one. */
4461 if (TREE_CODE (op0) == FUNCTION_DECL
4462 && DECL_STATIC_CHAIN (op0)
4463 && !TREE_NO_TRAMPOLINE (value))
4465 /* "&{...}" requires a temporary to hold the constructed
4467 if (TREE_CODE (op0) == CONSTRUCTOR)
4473 case NON_LVALUE_EXPR:
4474 return initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4477 case VIEW_CONVERT_EXPR:
4479 tree src = TREE_OPERAND (value, 0);
4480 tree src_type = TREE_TYPE (src);
4481 tree dest_type = TREE_TYPE (value);
4483 /* Allow view-conversions from aggregate to non-aggregate type only
4484 if the bit pattern is fully preserved afterwards; otherwise, the
4485 RTL expander won't be able to apply a subsequent transformation
4486 to the underlying constructor. */
4487 if (AGGREGATE_TYPE_P (src_type) && !AGGREGATE_TYPE_P (dest_type))
4489 if (TYPE_MODE (endtype) == TYPE_MODE (dest_type))
4490 return initializer_constant_valid_p_1 (src, endtype, cache);
4495 /* Allow all other kinds of view-conversion. */
4496 return initializer_constant_valid_p_1 (src, endtype, cache);
4501 tree src = TREE_OPERAND (value, 0);
4502 tree src_type = TREE_TYPE (src);
4503 tree dest_type = TREE_TYPE (value);
4505 /* Allow conversions between pointer types, floating-point
4506 types, and offset types. */
4507 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
4508 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
4509 || (TREE_CODE (dest_type) == OFFSET_TYPE
4510 && TREE_CODE (src_type) == OFFSET_TYPE))
4511 return initializer_constant_valid_p_1 (src, endtype, cache);
4513 /* Allow length-preserving conversions between integer types. */
4514 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
4515 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
4516 return initializer_constant_valid_p_1 (src, endtype, cache);
4518 /* Allow conversions between other integer types only if
4519 explicit value. Don't allow sign-extension to a type larger
4520 than word and pointer, there aren't relocations that would
4521 allow to sign extend it to a wider type. */
4522 if (INTEGRAL_TYPE_P (dest_type)
4523 && INTEGRAL_TYPE_P (src_type)
4524 && (TYPE_UNSIGNED (src_type)
4525 || TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type)
4526 || TYPE_PRECISION (dest_type) <= BITS_PER_WORD
4527 || TYPE_PRECISION (dest_type) <= POINTER_SIZE))
4529 tree inner = initializer_constant_valid_p_1 (src, endtype, cache);
4530 if (inner == null_pointer_node)
4531 return null_pointer_node;
4535 /* Allow (int) &foo provided int is as wide as a pointer. */
4536 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
4537 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
4538 return initializer_constant_valid_p_1 (src, endtype, cache);
4540 /* Likewise conversions from int to pointers, but also allow
4541 conversions from 0. */
4542 if ((POINTER_TYPE_P (dest_type)
4543 || TREE_CODE (dest_type) == OFFSET_TYPE)
4544 && INTEGRAL_TYPE_P (src_type))
4546 if (TREE_CODE (src) == INTEGER_CST
4547 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
4548 return null_pointer_node;
4549 if (integer_zerop (src))
4550 return null_pointer_node;
4551 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
4552 return initializer_constant_valid_p_1 (src, endtype, cache);
4555 /* Allow conversions to struct or union types if the value
4557 if (TREE_CODE (dest_type) == RECORD_TYPE
4558 || TREE_CODE (dest_type) == UNION_TYPE)
4559 return initializer_constant_valid_p_1 (src, endtype, cache);
4563 case POINTER_PLUS_EXPR:
4565 /* Any valid floating-point constants will have been folded by now;
4566 with -frounding-math we hit this with addition of two constants. */
4567 if (TREE_CODE (endtype) == REAL_TYPE)
4569 if (cache && cache[0] == value)
4571 if (! INTEGRAL_TYPE_P (endtype)
4572 || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
4574 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4576 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4579 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4580 endtype, ncache + 2);
4581 /* If either term is absolute, use the other term's relocation. */
4582 if (valid0 == null_pointer_node)
4584 else if (valid1 == null_pointer_node)
4586 /* Support narrowing pointer differences. */
4588 ret = narrowing_initializer_constant_valid_p (value, endtype,
4592 /* Support narrowing pointer differences. */
4593 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4602 if (TREE_CODE (endtype) == REAL_TYPE)
4604 if (cache && cache[0] == value)
4606 if (! INTEGRAL_TYPE_P (endtype)
4607 || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
4609 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4611 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4614 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4615 endtype, ncache + 2);
4616 /* Win if second argument is absolute. */
4617 if (valid1 == null_pointer_node)
4619 /* Win if both arguments have the same relocation.
4620 Then the value is absolute. */
4621 else if (valid0 == valid1 && valid0 != 0)
4622 ret = null_pointer_node;
4623 /* Since GCC guarantees that string constants are unique in the
4624 generated code, a subtraction between two copies of the same
4625 constant string is absolute. */
4626 else if (valid0 && TREE_CODE (valid0) == STRING_CST
4627 && valid1 && TREE_CODE (valid1) == STRING_CST
4628 && operand_equal_p (valid0, valid1, 1))
4629 ret = null_pointer_node;
4630 /* Support narrowing differences. */
4632 ret = narrowing_initializer_constant_valid_p (value, endtype,
4636 /* Support narrowing differences. */
4637 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4652 /* Return nonzero if VALUE is a valid constant-valued expression
4653 for use in initializing a static variable; one that can be an
4654 element of a "constant" initializer.
4656 Return null_pointer_node if the value is absolute;
4657 if it is relocatable, return the variable that determines the relocation.
4658 We assume that VALUE has been folded as much as possible;
4659 therefore, we do not need to check for such things as
4660 arithmetic-combinations of integers. */
4662 initializer_constant_valid_p (tree value, tree endtype, bool reverse)
4664 tree reloc = initializer_constant_valid_p_1 (value, endtype, NULL);
4666 /* An absolute value is required with reverse storage order. */
4668 && reloc != null_pointer_node
4670 && !AGGREGATE_TYPE_P (endtype)
4671 && !VECTOR_TYPE_P (endtype))
4677 /* Return true if VALUE is a valid constant-valued expression
4678 for use in initializing a static bit-field; one that can be
4679 an element of a "constant" initializer. */
4682 initializer_constant_valid_for_bitfield_p (tree value)
4684 /* For bitfields we support integer constants or possibly nested aggregates
4686 switch (TREE_CODE (value))
4690 unsigned HOST_WIDE_INT idx;
4693 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4694 if (!initializer_constant_valid_for_bitfield_p (elt))
4703 case VIEW_CONVERT_EXPR:
4704 case NON_LVALUE_EXPR:
4706 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value, 0));
4715 /* output_constructor outer state of relevance in recursive calls, typically
4716 for nested aggregate bitfields. */
4718 struct oc_outer_state {
4719 unsigned int bit_offset; /* current position in ... */
4720 int byte; /* ... the outer byte buffer. */
4723 static unsigned HOST_WIDE_INT
4724 output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int, bool,
4727 /* Output assembler code for constant EXP, with no label.
4728 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4729 Assumes output_addressed_constants has been done on EXP already.
4731 Generate at least SIZE bytes of assembler data, padding at the end
4732 with zeros if necessary. SIZE must always be specified. The returned
4733 value is the actual number of bytes of assembler data generated, which
4734 may be bigger than SIZE if the object contains a variable length field.
4736 SIZE is important for structure constructors,
4737 since trailing members may have been omitted from the constructor.
4738 It is also important for initialization of arrays from string constants
4739 since the full length of the string constant might not be wanted.
4740 It is also needed for initialization of unions, where the initializer's
4741 type is just one member, and that may not be as long as the union.
4743 There a case in which we would fail to output exactly SIZE bytes:
4744 for a structure constructor that wants to produce more than SIZE bytes.
4745 But such constructors will never be generated for any possible input.
4747 ALIGN is the alignment of the data in bits.
4749 If REVERSE is true, EXP is output in reverse storage order. */
4751 static unsigned HOST_WIDE_INT
4752 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align,
4755 enum tree_code code;
4756 unsigned HOST_WIDE_INT thissize;
4759 if (size == 0 || flag_syntax_only)
4762 /* See if we're trying to initialize a pointer in a non-default mode
4763 to the address of some declaration somewhere. If the target says
4764 the mode is valid for pointers, assume the target has a way of
4766 if (TREE_CODE (exp) == NOP_EXPR
4767 && POINTER_TYPE_P (TREE_TYPE (exp))
4768 && targetm.addr_space.valid_pointer_mode
4769 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp)),
4770 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)))))
4772 tree saved_type = TREE_TYPE (exp);
4774 /* Peel off any intermediate conversions-to-pointer for valid
4776 while (TREE_CODE (exp) == NOP_EXPR
4777 && POINTER_TYPE_P (TREE_TYPE (exp))
4778 && targetm.addr_space.valid_pointer_mode
4779 (SCALAR_INT_TYPE_MODE (TREE_TYPE (exp)),
4780 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)))))
4781 exp = TREE_OPERAND (exp, 0);
4783 /* If what we're left with is the address of something, we can
4784 convert the address to the final type and output it that
4786 if (TREE_CODE (exp) == ADDR_EXPR)
4787 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4788 /* Likewise for constant ints. */
4789 else if (TREE_CODE (exp) == INTEGER_CST)
4790 exp = fold_convert (saved_type, exp);
4794 /* Eliminate any conversions since we'll be outputting the underlying
4796 while (CONVERT_EXPR_P (exp)
4797 || TREE_CODE (exp) == NON_LVALUE_EXPR
4798 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4800 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4801 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4803 /* Make sure eliminating the conversion is really a no-op, except with
4804 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4805 union types to allow for Ada unchecked unions. */
4806 if (type_size > op_size
4807 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4808 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4809 /* Keep the conversion. */
4812 exp = TREE_OPERAND (exp, 0);
4815 code = TREE_CODE (TREE_TYPE (exp));
4816 thissize = int_size_in_bytes (TREE_TYPE (exp));
4818 /* Allow a constructor with no elements for any data type.
4819 This means to fill the space with zeros. */
4820 if (TREE_CODE (exp) == CONSTRUCTOR
4821 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp)))
4823 assemble_zeros (size);
4827 if (TREE_CODE (exp) == FDESC_EXPR)
4829 #ifdef ASM_OUTPUT_FDESC
4830 HOST_WIDE_INT part = tree_to_shwi (TREE_OPERAND (exp, 1));
4831 tree decl = TREE_OPERAND (exp, 0);
4832 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4839 /* Now output the underlying data. If we've handling the padding, return.
4840 Otherwise, break and ensure SIZE is the size written. */
4847 case REFERENCE_TYPE:
4849 case FIXED_POINT_TYPE:
4850 case POINTER_BOUNDS_TYPE:
4852 cst = expand_expr (exp, NULL_RTX, VOIDmode, EXPAND_INITIALIZER);
4854 cst = flip_storage_order (TYPE_MODE (TREE_TYPE (exp)), cst);
4855 if (!assemble_integer (cst, MIN (size, thissize), align, 0))
4856 error ("initializer for integer/fixed-point value is too complicated");
4860 if (TREE_CODE (exp) != REAL_CST)
4861 error ("initializer for floating value is not a floating constant");
4863 assemble_real (TREE_REAL_CST (exp),
4864 SCALAR_FLOAT_TYPE_MODE (TREE_TYPE (exp)),
4869 output_constant (TREE_REALPART (exp), thissize / 2, align, reverse);
4870 output_constant (TREE_IMAGPART (exp), thissize / 2,
4871 min_align (align, BITS_PER_UNIT * (thissize / 2)),
4877 switch (TREE_CODE (exp))
4880 return output_constructor (exp, size, align, reverse, NULL);
4883 = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp), size);
4884 assemble_string (TREE_STRING_POINTER (exp), thissize);
4888 machine_mode inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4889 unsigned int nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4890 int elt_size = GET_MODE_SIZE (inner);
4891 output_constant (VECTOR_CST_ELT (exp, 0), elt_size, align,
4893 thissize = elt_size;
4894 for (unsigned int i = 1; i < VECTOR_CST_NELTS (exp); i++)
4896 output_constant (VECTOR_CST_ELT (exp, i), elt_size, nalign,
4898 thissize += elt_size;
4909 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4910 return output_constructor (exp, size, align, reverse, NULL);
4919 if (size > thissize)
4920 assemble_zeros (size - thissize);
4925 /* Subroutine of output_constructor, used for computing the size of
4926 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4927 type with an unspecified upper bound. */
4929 static unsigned HOST_WIDE_INT
4930 array_size_for_constructor (tree val)
4933 unsigned HOST_WIDE_INT cnt;
4934 tree index, value, tmp;
4937 /* This code used to attempt to handle string constants that are not
4938 arrays of single-bytes, but nothing else does, so there's no point in
4940 if (TREE_CODE (val) == STRING_CST)
4941 return TREE_STRING_LENGTH (val);
4943 max_index = NULL_TREE;
4944 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4946 if (TREE_CODE (index) == RANGE_EXPR)
4947 index = TREE_OPERAND (index, 1);
4948 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4952 if (max_index == NULL_TREE)
4955 /* Compute the total number of array elements. */
4956 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4957 i = wi::to_offset (max_index) - wi::to_offset (tmp) + 1;
4959 /* Multiply by the array element unit size to find number of bytes. */
4960 i *= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4962 gcc_assert (wi::fits_uhwi_p (i));
4963 return i.to_uhwi ();
4966 /* Other datastructures + helpers for output_constructor. */
4968 /* output_constructor local state to support interaction with helpers. */
4970 struct oc_local_state {
4972 /* Received arguments. */
4973 tree exp; /* Constructor expression. */
4974 tree type; /* Type of constructor expression. */
4975 unsigned HOST_WIDE_INT size; /* # bytes to output - pad if necessary. */
4976 unsigned int align; /* Known initial alignment. */
4977 tree min_index; /* Lower bound if specified for an array. */
4979 /* Output processing state. */
4980 HOST_WIDE_INT total_bytes; /* # bytes output so far / current position. */
4981 int byte; /* Part of a bitfield byte yet to be output. */
4982 int last_relative_index; /* Implicit or explicit index of the last
4983 array element output within a bitfield. */
4984 bool byte_buffer_in_use; /* Whether BYTE is in use. */
4985 bool reverse; /* Whether reverse storage order is in use. */
4987 /* Current element. */
4988 tree field; /* Current field decl in a record. */
4989 tree val; /* Current element value. */
4990 tree index; /* Current element index. */
4994 /* Helper for output_constructor. From the current LOCAL state, output a
4995 RANGE_EXPR element. */
4998 output_constructor_array_range (oc_local_state *local)
5000 unsigned HOST_WIDE_INT fieldsize
5001 = int_size_in_bytes (TREE_TYPE (local->type));
5003 HOST_WIDE_INT lo_index
5004 = tree_to_shwi (TREE_OPERAND (local->index, 0));
5005 HOST_WIDE_INT hi_index
5006 = tree_to_shwi (TREE_OPERAND (local->index, 1));
5007 HOST_WIDE_INT index;
5010 = min_align (local->align, fieldsize * BITS_PER_UNIT);
5012 for (index = lo_index; index <= hi_index; index++)
5014 /* Output the element's initial value. */
5015 if (local->val == NULL_TREE)
5016 assemble_zeros (fieldsize);
5019 = output_constant (local->val, fieldsize, align2, local->reverse);
5021 /* Count its size. */
5022 local->total_bytes += fieldsize;
5026 /* Helper for output_constructor. From the current LOCAL state, output a
5027 field element that is not true bitfield or part of an outer one. */
5030 output_constructor_regular_field (oc_local_state *local)
5032 /* Field size and position. Since this structure is static, we know the
5033 positions are constant. */
5034 unsigned HOST_WIDE_INT fieldsize;
5035 HOST_WIDE_INT fieldpos;
5037 unsigned int align2;
5039 /* Output any buffered-up bit-fields preceding this element. */
5040 if (local->byte_buffer_in_use)
5042 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
5043 local->total_bytes++;
5044 local->byte_buffer_in_use = false;
5047 if (local->index != NULL_TREE)
5049 /* Perform the index calculation in modulo arithmetic but
5050 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
5051 but we are using an unsigned sizetype. */
5052 unsigned prec = TYPE_PRECISION (sizetype);
5053 offset_int idx = wi::sext (wi::to_offset (local->index)
5054 - wi::to_offset (local->min_index), prec);
5055 fieldpos = (idx * wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local->val))))
5058 else if (local->field != NULL_TREE)
5059 fieldpos = int_byte_position (local->field);
5063 /* Advance to offset of this element.
5064 Note no alignment needed in an array, since that is guaranteed
5065 if each element has the proper size. */
5066 if (local->field != NULL_TREE || local->index != NULL_TREE)
5068 if (fieldpos > local->total_bytes)
5070 assemble_zeros (fieldpos - local->total_bytes);
5071 local->total_bytes = fieldpos;
5074 /* Must not go backwards. */
5075 gcc_assert (fieldpos == local->total_bytes);
5078 /* Find the alignment of this element. */
5079 align2 = min_align (local->align, BITS_PER_UNIT * fieldpos);
5081 /* Determine size this element should occupy. */
5086 /* If this is an array with an unspecified upper bound,
5087 the initializer determines the size. */
5088 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5089 but we cannot do this until the deprecated support for
5090 initializing zero-length array members is removed. */
5091 if (TREE_CODE (TREE_TYPE (local->field)) == ARRAY_TYPE
5092 && (!TYPE_DOMAIN (TREE_TYPE (local->field))
5093 || !TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local->field)))))
5095 fieldsize = array_size_for_constructor (local->val);
5096 /* Given a non-empty initialization, this field had better
5097 be last. Given a flexible array member, the next field
5098 on the chain is a TYPE_DECL of the enclosing struct. */
5099 const_tree next = DECL_CHAIN (local->field);
5100 gcc_assert (!fieldsize || !next || TREE_CODE (next) != FIELD_DECL);
5103 fieldsize = tree_to_uhwi (DECL_SIZE_UNIT (local->field));
5106 fieldsize = int_size_in_bytes (TREE_TYPE (local->type));
5108 /* Output the element's initial value. */
5109 if (local->val == NULL_TREE)
5110 assemble_zeros (fieldsize);
5113 = output_constant (local->val, fieldsize, align2, local->reverse);
5115 /* Count its size. */
5116 local->total_bytes += fieldsize;
5119 /* Helper for output_constructor. From the LOCAL state, output an element
5120 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5121 from the start of a possibly ongoing outer byte buffer. */
5124 output_constructor_bitfield (oc_local_state *local, unsigned int bit_offset)
5126 /* Bit size of this element. */
5127 HOST_WIDE_INT ebitsize
5129 ? tree_to_uhwi (DECL_SIZE (local->field))
5130 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local->type))));
5132 /* Relative index of this element if this is an array component. */
5133 HOST_WIDE_INT relative_index
5136 ? (tree_to_shwi (local->index)
5137 - tree_to_shwi (local->min_index))
5138 : local->last_relative_index + 1)
5141 /* Bit position of this element from the start of the containing
5143 HOST_WIDE_INT constructor_relative_ebitpos
5145 ? int_bit_position (local->field)
5146 : ebitsize * relative_index);
5148 /* Bit position of this element from the start of a possibly ongoing
5149 outer byte buffer. */
5150 HOST_WIDE_INT byte_relative_ebitpos
5151 = bit_offset + constructor_relative_ebitpos;
5153 /* From the start of a possibly ongoing outer byte buffer, offsets to
5154 the first bit of this element and to the first bit past the end of
5156 HOST_WIDE_INT next_offset = byte_relative_ebitpos;
5157 HOST_WIDE_INT end_offset = byte_relative_ebitpos + ebitsize;
5159 local->last_relative_index = relative_index;
5161 if (local->val == NULL_TREE)
5162 local->val = integer_zero_node;
5164 while (TREE_CODE (local->val) == VIEW_CONVERT_EXPR
5165 || TREE_CODE (local->val) == NON_LVALUE_EXPR)
5166 local->val = TREE_OPERAND (local->val, 0);
5168 if (TREE_CODE (local->val) != INTEGER_CST
5169 && TREE_CODE (local->val) != CONSTRUCTOR)
5171 error ("invalid initial value for member %qE", DECL_NAME (local->field));
5175 /* If this field does not start in this (or next) byte, skip some bytes. */
5176 if (next_offset / BITS_PER_UNIT != local->total_bytes)
5178 /* Output remnant of any bit field in previous bytes. */
5179 if (local->byte_buffer_in_use)
5181 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
5182 local->total_bytes++;
5183 local->byte_buffer_in_use = false;
5186 /* If still not at proper byte, advance to there. */
5187 if (next_offset / BITS_PER_UNIT != local->total_bytes)
5189 gcc_assert (next_offset / BITS_PER_UNIT >= local->total_bytes);
5190 assemble_zeros (next_offset / BITS_PER_UNIT - local->total_bytes);
5191 local->total_bytes = next_offset / BITS_PER_UNIT;
5195 /* Set up the buffer if necessary. */
5196 if (!local->byte_buffer_in_use)
5200 local->byte_buffer_in_use = true;
5203 /* If this is nested constructor, recurse passing the bit offset and the
5204 pending data, then retrieve the new pending data afterwards. */
5205 if (TREE_CODE (local->val) == CONSTRUCTOR)
5207 oc_outer_state temp_state;
5208 temp_state.bit_offset = next_offset % BITS_PER_UNIT;
5209 temp_state.byte = local->byte;
5211 += output_constructor (local->val, 0, 0, local->reverse, &temp_state);
5212 local->byte = temp_state.byte;
5216 /* Otherwise, we must split the element into pieces that fall within
5217 separate bytes, and combine each byte with previous or following
5219 while (next_offset < end_offset)
5223 HOST_WIDE_INT value;
5224 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
5225 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
5227 /* Advance from byte to byte within this element when necessary. */
5228 while (next_byte != local->total_bytes)
5230 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
5231 local->total_bytes++;
5235 /* Number of bits we can process at once (all part of the same byte). */
5236 this_time = MIN (end_offset - next_offset, BITS_PER_UNIT - next_bit);
5237 if (local->reverse ? !BYTES_BIG_ENDIAN : BYTES_BIG_ENDIAN)
5239 /* For big-endian data, take the most significant bits (of the
5240 bits that are significant) first and put them into bytes from
5241 the most significant end. */
5242 shift = end_offset - next_offset - this_time;
5244 /* Don't try to take a bunch of bits that cross
5245 the word boundary in the INTEGER_CST. We can
5246 only select bits from one element. */
5247 if ((shift / HOST_BITS_PER_WIDE_INT)
5248 != ((shift + this_time - 1) / HOST_BITS_PER_WIDE_INT))
5250 const int end = shift + this_time - 1;
5251 shift = end & -HOST_BITS_PER_WIDE_INT;
5252 this_time = end - shift + 1;
5255 /* Now get the bits from the appropriate constant word. */
5256 value = TREE_INT_CST_ELT (local->val, shift / HOST_BITS_PER_WIDE_INT);
5257 shift = shift & (HOST_BITS_PER_WIDE_INT - 1);
5259 /* Get the result. This works only when:
5260 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5261 local->byte |= (((value >> shift)
5262 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
5263 << (BITS_PER_UNIT - this_time - next_bit));
5267 /* On little-endian machines, take the least significant bits of
5268 the value first and pack them starting at the least significant
5269 bits of the bytes. */
5270 shift = next_offset - byte_relative_ebitpos;
5272 /* Don't try to take a bunch of bits that cross
5273 the word boundary in the INTEGER_CST. We can
5274 only select bits from one element. */
5275 if ((shift / HOST_BITS_PER_WIDE_INT)
5276 != ((shift + this_time - 1) / HOST_BITS_PER_WIDE_INT))
5278 = HOST_BITS_PER_WIDE_INT - (shift & (HOST_BITS_PER_WIDE_INT - 1));
5280 /* Now get the bits from the appropriate constant word. */
5281 value = TREE_INT_CST_ELT (local->val, shift / HOST_BITS_PER_WIDE_INT);
5282 shift = shift & (HOST_BITS_PER_WIDE_INT - 1);
5284 /* Get the result. This works only when:
5285 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5286 local->byte |= (((value >> shift)
5287 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
5291 next_offset += this_time;
5292 local->byte_buffer_in_use = true;
5296 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5297 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5298 caller output state of relevance in recursive invocations. */
5300 static unsigned HOST_WIDE_INT
5301 output_constructor (tree exp, unsigned HOST_WIDE_INT size, unsigned int align,
5302 bool reverse, oc_outer_state *outer)
5304 unsigned HOST_WIDE_INT cnt;
5305 constructor_elt *ce;
5306 oc_local_state local;
5308 /* Setup our local state to communicate with helpers. */
5310 local.type = TREE_TYPE (exp);
5312 local.align = align;
5313 if (TREE_CODE (local.type) == ARRAY_TYPE && TYPE_DOMAIN (local.type))
5314 local.min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (local.type));
5316 local.min_index = integer_zero_node;
5318 local.total_bytes = 0;
5319 local.byte_buffer_in_use = outer != NULL;
5320 local.byte = outer ? outer->byte : 0;
5321 local.last_relative_index = -1;
5322 /* The storage order is specified for every aggregate type. */
5323 if (AGGREGATE_TYPE_P (local.type))
5324 local.reverse = TYPE_REVERSE_STORAGE_ORDER (local.type);
5326 local.reverse = reverse;
5328 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
5330 /* As CE goes through the elements of the constant, FIELD goes through the
5331 structure fields if the constant is a structure. If the constant is a
5332 union, we override this by getting the field from the TREE_LIST element.
5333 But the constant could also be an array. Then FIELD is zero.
5335 There is always a maximum of one element in the chain LINK for unions
5336 (even if the initializer in a source program incorrectly contains
5339 if (TREE_CODE (local.type) == RECORD_TYPE)
5340 local.field = TYPE_FIELDS (local.type);
5342 local.field = NULL_TREE;
5345 vec_safe_iterate (CONSTRUCTOR_ELTS (exp), cnt, &ce);
5346 cnt++, local.field = local.field ? DECL_CHAIN (local.field) : 0)
5348 local.val = ce->value;
5349 local.index = NULL_TREE;
5351 /* The element in a union constructor specifies the proper field
5353 if (RECORD_OR_UNION_TYPE_P (local.type) && ce->index != NULL_TREE)
5354 local.field = ce->index;
5356 else if (TREE_CODE (local.type) == ARRAY_TYPE)
5357 local.index = ce->index;
5359 if (local.field && flag_verbose_asm)
5360 fprintf (asm_out_file, "%s %s:\n",
5362 DECL_NAME (local.field)
5363 ? IDENTIFIER_POINTER (DECL_NAME (local.field))
5366 /* Eliminate the marker that makes a cast not be an lvalue. */
5367 if (local.val != NULL_TREE)
5368 STRIP_NOPS (local.val);
5370 /* Output the current element, using the appropriate helper ... */
5372 /* For an array slice not part of an outer bitfield. */
5374 && local.index != NULL_TREE
5375 && TREE_CODE (local.index) == RANGE_EXPR)
5376 output_constructor_array_range (&local);
5378 /* For a field that is neither a true bitfield nor part of an outer one,
5379 known to be at least byte aligned and multiple-of-bytes long. */
5381 && (local.field == NULL_TREE
5382 || !CONSTRUCTOR_BITFIELD_P (local.field)))
5383 output_constructor_regular_field (&local);
5385 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5386 supported for scalar fields, so we may need to convert first. */
5389 if (TREE_CODE (local.val) == REAL_CST)
5391 = fold_unary (VIEW_CONVERT_EXPR,
5392 build_nonstandard_integer_type
5393 (TYPE_PRECISION (TREE_TYPE (local.val)), 0),
5395 output_constructor_bitfield (&local, outer ? outer->bit_offset : 0);
5399 /* If we are not at toplevel, save the pending data for our caller.
5400 Otherwise output the pending data and padding zeros as needed. */
5402 outer->byte = local.byte;
5405 if (local.byte_buffer_in_use)
5407 assemble_integer (GEN_INT (local.byte), 1, BITS_PER_UNIT, 1);
5408 local.total_bytes++;
5411 if ((unsigned HOST_WIDE_INT)local.total_bytes < local.size)
5413 assemble_zeros (local.size - local.total_bytes);
5414 local.total_bytes = local.size;
5418 return local.total_bytes;
5421 /* Mark DECL as weak. */
5424 mark_weak (tree decl)
5426 if (DECL_WEAK (decl))
5429 struct symtab_node *n = symtab_node::get (decl);
5430 if (n && n->refuse_visibility_changes)
5431 error ("%+qD declared weak after being used", decl);
5432 DECL_WEAK (decl) = 1;
5434 if (DECL_RTL_SET_P (decl)
5435 && MEM_P (DECL_RTL (decl))
5436 && XEXP (DECL_RTL (decl), 0)
5437 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
5438 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
5441 /* Merge weak status between NEWDECL and OLDDECL. */
5444 merge_weak (tree newdecl, tree olddecl)
5446 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
5448 if (DECL_WEAK (newdecl) && TARGET_SUPPORTS_WEAK)
5451 /* We put the NEWDECL on the weak_decls list at some point
5452 and OLDDECL as well. Keep just OLDDECL on the list. */
5453 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
5454 if (TREE_VALUE (*pwd) == newdecl)
5456 *pwd = TREE_CHAIN (*pwd);
5463 if (DECL_WEAK (newdecl))
5467 /* NEWDECL is weak, but OLDDECL is not. */
5469 /* If we already output the OLDDECL, we're in trouble; we can't
5470 go back and make it weak. This should never happen in
5471 unit-at-a-time compilation. */
5472 gcc_assert (!TREE_ASM_WRITTEN (olddecl));
5474 /* If we've already generated rtl referencing OLDDECL, we may
5475 have done so in a way that will not function properly with
5476 a weak symbol. Again in unit-at-a-time this should be
5478 gcc_assert (!TREE_USED (olddecl)
5479 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)));
5481 /* PR 49899: You cannot convert a static function into a weak, public function. */
5482 if (! TREE_PUBLIC (olddecl) && TREE_PUBLIC (newdecl))
5483 error ("weak declaration of %q+D being applied to a already "
5484 "existing, static definition", newdecl);
5486 if (TARGET_SUPPORTS_WEAK)
5488 /* We put the NEWDECL on the weak_decls list at some point.
5489 Replace it with the OLDDECL. */
5490 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
5491 if (TREE_VALUE (wd) == newdecl)
5493 TREE_VALUE (wd) = olddecl;
5496 /* We may not find the entry on the list. If NEWDECL is a
5497 weak alias, then we will have already called
5498 globalize_decl to remove the entry; in that case, we do
5499 not need to do anything. */
5502 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5503 mark_weak (olddecl);
5506 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5507 weak. Just update NEWDECL to indicate that it's weak too. */
5508 mark_weak (newdecl);
5511 /* Declare DECL to be a weak symbol. */
5514 declare_weak (tree decl)
5516 gcc_assert (TREE_CODE (decl) != FUNCTION_DECL || !TREE_ASM_WRITTEN (decl));
5517 if (! TREE_PUBLIC (decl))
5519 error ("weak declaration of %q+D must be public", decl);
5522 else if (!TARGET_SUPPORTS_WEAK)
5523 warning (0, "weak declaration of %q+D not supported", decl);
5526 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl)))
5527 DECL_ATTRIBUTES (decl)
5528 = tree_cons (get_identifier ("weak"), NULL, DECL_ATTRIBUTES (decl));
5532 weak_finish_1 (tree decl)
5534 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5535 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5538 if (! TREE_USED (decl))
5541 #ifdef ASM_WEAKEN_DECL
5542 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
5544 #ifdef ASM_WEAKEN_LABEL
5545 ASM_WEAKEN_LABEL (asm_out_file, name);
5547 #ifdef ASM_OUTPUT_WEAK_ALIAS
5549 static bool warn_once = 0;
5552 warning (0, "only weak aliases are supported in this configuration");
5562 /* Fiven an assembly name, find the decl it is associated with. */
5564 find_decl (tree target)
5566 symtab_node *node = symtab_node::get_for_asmname (target);
5572 /* This TREE_LIST contains weakref targets. */
5574 static GTY(()) tree weakref_targets;
5576 /* Emit any pending weak declarations. */
5583 for (t = weakref_targets; t; t = TREE_CHAIN (t))
5585 tree alias_decl = TREE_PURPOSE (t);
5586 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
5588 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
5589 /* Remove alias_decl from the weak list, but leave entries for
5590 the target alone. */
5592 #ifndef ASM_OUTPUT_WEAKREF
5593 else if (! TREE_SYMBOL_REFERENCED (target))
5595 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5596 defined, otherwise we and weak_finish_1 would use
5597 different macros. */
5598 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5599 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
5601 tree decl = find_decl (target);
5605 decl = build_decl (DECL_SOURCE_LOCATION (alias_decl),
5606 TREE_CODE (alias_decl), target,
5607 TREE_TYPE (alias_decl));
5609 DECL_EXTERNAL (decl) = 1;
5610 TREE_PUBLIC (decl) = 1;
5611 DECL_ARTIFICIAL (decl) = 1;
5612 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
5613 TREE_USED (decl) = 1;
5616 weak_finish_1 (decl);
5625 /* Remove the alias and the target from the pending weak list
5626 so that we do not emit any .weak directives for the former,
5627 nor multiple .weak directives for the latter. */
5628 for (p = &weak_decls; (t2 = *p) ; )
5630 if (TREE_VALUE (t2) == alias_decl
5631 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
5632 *p = TREE_CHAIN (t2);
5634 p = &TREE_CHAIN (t2);
5637 /* Remove other weakrefs to the same target, to speed things up. */
5638 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
5640 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
5641 *p = TREE_CHAIN (t2);
5643 p = &TREE_CHAIN (t2);
5648 for (t = weak_decls; t; t = TREE_CHAIN (t))
5650 tree decl = TREE_VALUE (t);
5652 weak_finish_1 (decl);
5656 /* Emit the assembly bits to indicate that DECL is globally visible. */
5659 globalize_decl (tree decl)
5662 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5663 if (DECL_WEAK (decl))
5665 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
5668 #ifdef ASM_WEAKEN_DECL
5669 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
5671 ASM_WEAKEN_LABEL (asm_out_file, name);
5674 /* Remove this function from the pending weak list so that
5675 we do not emit multiple .weak directives for it. */
5676 for (p = &weak_decls; (t = *p) ; )
5678 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5679 *p = TREE_CHAIN (t);
5681 p = &TREE_CHAIN (t);
5684 /* Remove weakrefs to the same target from the pending weakref
5685 list, for the same reason. */
5686 for (p = &weakref_targets; (t = *p) ; )
5688 if (DECL_ASSEMBLER_NAME (decl)
5689 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5690 *p = TREE_CHAIN (t);
5692 p = &TREE_CHAIN (t);
5699 targetm.asm_out.globalize_decl_name (asm_out_file, decl);
5702 vec<alias_pair, va_gc> *alias_pairs;
5704 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5705 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5706 tree node is DECL to have the value of the tree node TARGET. */
5709 do_assemble_alias (tree decl, tree target)
5713 /* Emulated TLS had better not get this var. */
5714 gcc_assert (!(!targetm.have_tls
5716 && DECL_THREAD_LOCAL_P (decl)));
5718 if (TREE_ASM_WRITTEN (decl))
5721 id = DECL_ASSEMBLER_NAME (decl);
5722 ultimate_transparent_alias_target (&id);
5723 ultimate_transparent_alias_target (&target);
5725 /* We must force creation of DECL_RTL for debug info generation, even though
5726 we don't use it here. */
5727 make_decl_rtl (decl);
5729 TREE_ASM_WRITTEN (decl) = 1;
5730 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
5731 TREE_ASM_WRITTEN (id) = 1;
5733 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5735 if (!TREE_SYMBOL_REFERENCED (target))
5736 weakref_targets = tree_cons (decl, target, weakref_targets);
5738 #ifdef ASM_OUTPUT_WEAKREF
5739 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
5740 IDENTIFIER_POINTER (id),
5741 IDENTIFIER_POINTER (target));
5743 if (!TARGET_SUPPORTS_WEAK)
5745 error_at (DECL_SOURCE_LOCATION (decl),
5746 "weakref is not supported in this configuration");
5753 #ifdef ASM_OUTPUT_DEF
5754 tree orig_decl = decl;
5756 if (TREE_CODE (decl) == FUNCTION_DECL
5757 && cgraph_node::get (decl)->instrumentation_clone
5758 && cgraph_node::get (decl)->instrumented_version)
5759 orig_decl = cgraph_node::get (decl)->instrumented_version->decl;
5761 /* Make name accessible from other files, if appropriate. */
5763 if (TREE_PUBLIC (decl) || TREE_PUBLIC (orig_decl))
5765 globalize_decl (decl);
5766 maybe_assemble_visibility (decl);
5768 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl)))
5770 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5771 if (targetm.has_ifunc_p ())
5772 ASM_OUTPUT_TYPE_DIRECTIVE
5773 (asm_out_file, IDENTIFIER_POINTER (id),
5777 error_at (DECL_SOURCE_LOCATION (decl),
5778 "ifunc is not supported on this target");
5781 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5782 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
5784 ASM_OUTPUT_DEF (asm_out_file,
5785 IDENTIFIER_POINTER (id),
5786 IDENTIFIER_POINTER (target));
5788 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5793 name = IDENTIFIER_POINTER (id);
5794 # ifdef ASM_WEAKEN_DECL
5795 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
5797 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
5799 /* Remove this function from the pending weak list so that
5800 we do not emit multiple .weak directives for it. */
5801 for (p = &weak_decls; (t = *p) ; )
5802 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t))
5803 || id == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5804 *p = TREE_CHAIN (t);
5806 p = &TREE_CHAIN (t);
5808 /* Remove weakrefs to the same target from the pending weakref
5809 list, for the same reason. */
5810 for (p = &weakref_targets; (t = *p) ; )
5812 if (id == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5813 *p = TREE_CHAIN (t);
5815 p = &TREE_CHAIN (t);
5821 /* Emit an assembler directive to make the symbol for DECL an alias to
5822 the symbol for TARGET. */
5825 assemble_alias (tree decl, tree target)
5829 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5831 tree alias = DECL_ASSEMBLER_NAME (decl);
5833 ultimate_transparent_alias_target (&target);
5835 if (alias == target)
5836 error ("weakref %q+D ultimately targets itself", decl);
5837 if (TREE_PUBLIC (decl))
5838 error ("weakref %q+D must have static linkage", decl);
5842 #if !defined (ASM_OUTPUT_DEF)
5843 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5844 error_at (DECL_SOURCE_LOCATION (decl),
5845 "alias definitions not supported in this configuration");
5846 TREE_ASM_WRITTEN (decl) = 1;
5849 if (!DECL_WEAK (decl))
5851 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl)))
5852 error_at (DECL_SOURCE_LOCATION (decl),
5853 "ifunc is not supported in this configuration");
5855 error_at (DECL_SOURCE_LOCATION (decl),
5856 "only weak aliases are supported in this configuration");
5857 TREE_ASM_WRITTEN (decl) = 1;
5863 TREE_USED (decl) = 1;
5865 /* Allow aliases to aliases. */
5866 if (TREE_CODE (decl) == FUNCTION_DECL)
5867 cgraph_node::get_create (decl)->alias = true;
5869 varpool_node::get_create (decl)->alias = true;
5871 /* If the target has already been emitted, we don't have to queue the
5872 alias. This saves a tad of memory. */
5873 if (symtab->global_info_ready)
5874 target_decl = find_decl (target);
5877 if ((target_decl && TREE_ASM_WRITTEN (target_decl))
5878 || symtab->state >= EXPANSION)
5879 do_assemble_alias (decl, target);
5882 alias_pair p = {decl, target};
5883 vec_safe_push (alias_pairs, p);
5887 /* Record and output a table of translations from original function
5888 to its transaction aware clone. Note that tm_pure functions are
5889 considered to be their own clone. */
5891 struct tm_clone_hasher : ggc_cache_ptr_hash<tree_map>
5893 static hashval_t hash (tree_map *m) { return tree_map_hash (m); }
5894 static bool equal (tree_map *a, tree_map *b) { return tree_map_eq (a, b); }
5897 keep_cache_entry (tree_map *&e)
5899 return ggc_marked_p (e->base.from);
5903 static GTY((cache)) hash_table<tm_clone_hasher> *tm_clone_hash;
5906 record_tm_clone_pair (tree o, tree n)
5908 struct tree_map **slot, *h;
5910 if (tm_clone_hash == NULL)
5911 tm_clone_hash = hash_table<tm_clone_hasher>::create_ggc (32);
5913 h = ggc_alloc<tree_map> ();
5914 h->hash = htab_hash_pointer (o);
5918 slot = tm_clone_hash->find_slot_with_hash (h, h->hash, INSERT);
5923 get_tm_clone_pair (tree o)
5927 struct tree_map *h, in;
5930 in.hash = htab_hash_pointer (o);
5931 h = tm_clone_hash->find_with_hash (&in, in.hash);
5938 struct tm_alias_pair
5946 /* Dump the actual pairs to the .tm_clone_table section. */
5949 dump_tm_clone_pairs (vec<tm_alias_pair> tm_alias_pairs)
5953 bool switched = false;
5955 FOR_EACH_VEC_ELT (tm_alias_pairs, i, p)
5959 struct cgraph_node *src_n = cgraph_node::get (src);
5960 struct cgraph_node *dst_n = cgraph_node::get (dst);
5962 /* The function ipa_tm_create_version() marks the clone as needed if
5963 the original function was needed. But we also mark the clone as
5964 needed if we ever called the clone indirectly through
5965 TM_GETTMCLONE. If neither of these are true, we didn't generate
5966 a clone, and we didn't call it indirectly... no sense keeping it
5967 in the clone table. */
5968 if (!dst_n || !dst_n->definition)
5971 /* This covers the case where we have optimized the original
5972 function away, and only access the transactional clone. */
5973 if (!src_n || !src_n->definition)
5978 switch_to_section (targetm.asm_out.tm_clone_table_section ());
5979 assemble_align (POINTER_SIZE);
5983 assemble_integer (XEXP (DECL_RTL (src), 0),
5984 POINTER_SIZE_UNITS, POINTER_SIZE, 1);
5985 assemble_integer (XEXP (DECL_RTL (dst), 0),
5986 POINTER_SIZE_UNITS, POINTER_SIZE, 1);
5990 /* Provide a default for the tm_clone_table section. */
5993 default_clone_table_section (void)
5995 return get_named_section (NULL, ".tm_clone_table", 3);
5998 /* Helper comparison function for qsorting by the DECL_UID stored in
5999 alias_pair->emitted_diags. */
6002 tm_alias_pair_cmp (const void *x, const void *y)
6004 const tm_alias_pair *p1 = (const tm_alias_pair *) x;
6005 const tm_alias_pair *p2 = (const tm_alias_pair *) y;
6006 if (p1->uid < p2->uid)
6008 if (p1->uid > p2->uid)
6014 finish_tm_clone_pairs (void)
6016 vec<tm_alias_pair> tm_alias_pairs = vNULL;
6018 if (tm_clone_hash == NULL)
6021 /* We need a determenistic order for the .tm_clone_table, otherwise
6022 we will get bootstrap comparison failures, so dump the hash table
6023 to a vector, sort it, and dump the vector. */
6025 /* Dump the hashtable to a vector. */
6027 hash_table<tm_clone_hasher>::iterator iter;
6028 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash, map, tree_map *, iter)
6030 tm_alias_pair p = {DECL_UID (map->base.from), map->base.from, map->to};
6031 tm_alias_pairs.safe_push (p);
6034 tm_alias_pairs.qsort (tm_alias_pair_cmp);
6037 dump_tm_clone_pairs (tm_alias_pairs);
6039 tm_clone_hash->empty ();
6040 tm_clone_hash = NULL;
6041 tm_alias_pairs.release ();
6045 /* Emit an assembler directive to set symbol for DECL visibility to
6046 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
6049 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED,
6050 int vis ATTRIBUTE_UNUSED)
6052 #ifdef HAVE_GAS_HIDDEN
6053 static const char * const visibility_types[] = {
6054 NULL, "protected", "hidden", "internal"
6057 const char *name, *type;
6060 id = DECL_ASSEMBLER_NAME (decl);
6061 ultimate_transparent_alias_target (&id);
6062 name = IDENTIFIER_POINTER (id);
6064 type = visibility_types[vis];
6066 fprintf (asm_out_file, "\t.%s\t", type);
6067 assemble_name (asm_out_file, name);
6068 fprintf (asm_out_file, "\n");
6070 if (!DECL_ARTIFICIAL (decl))
6071 warning (OPT_Wattributes, "visibility attribute not supported "
6072 "in this configuration; ignored");
6076 /* A helper function to call assemble_visibility when needed for a decl. */
6079 maybe_assemble_visibility (tree decl)
6081 enum symbol_visibility vis = DECL_VISIBILITY (decl);
6083 if (TREE_CODE (decl) == FUNCTION_DECL
6084 && cgraph_node::get (decl)
6085 && cgraph_node::get (decl)->instrumentation_clone
6086 && cgraph_node::get (decl)->instrumented_version)
6087 vis = DECL_VISIBILITY (cgraph_node::get (decl)->instrumented_version->decl);
6089 if (vis != VISIBILITY_DEFAULT)
6091 targetm.asm_out.assemble_visibility (decl, vis);
6098 /* Returns 1 if the target configuration supports defining public symbols
6099 so that one of them will be chosen at link time instead of generating a
6100 multiply-defined symbol error, whether through the use of weak symbols or
6101 a target-specific mechanism for having duplicates discarded. */
6104 supports_one_only (void)
6106 if (SUPPORTS_ONE_ONLY)
6108 return TARGET_SUPPORTS_WEAK;
6111 /* Set up DECL as a public symbol that can be defined in multiple
6112 translation units without generating a linker error. */
6115 make_decl_one_only (tree decl, tree comdat_group)
6117 struct symtab_node *symbol;
6118 gcc_assert (VAR_OR_FUNCTION_DECL_P (decl));
6120 TREE_PUBLIC (decl) = 1;
6123 symbol = varpool_node::get_create (decl);
6125 symbol = cgraph_node::get_create (decl);
6127 if (SUPPORTS_ONE_ONLY)
6129 #ifdef MAKE_DECL_ONE_ONLY
6130 MAKE_DECL_ONE_ONLY (decl);
6132 symbol->set_comdat_group (comdat_group);
6134 else if (VAR_P (decl)
6135 && (DECL_INITIAL (decl) == 0
6136 || (!in_lto_p && DECL_INITIAL (decl) == error_mark_node)))
6137 DECL_COMMON (decl) = 1;
6140 gcc_assert (TARGET_SUPPORTS_WEAK);
6141 DECL_WEAK (decl) = 1;
6146 init_varasm_once (void)
6148 section_htab = hash_table<section_hasher>::create_ggc (31);
6149 object_block_htab = hash_table<object_block_hasher>::create_ggc (31);
6150 const_desc_htab = hash_table<tree_descriptor_hasher>::create_ggc (1009);
6152 shared_constant_pool = create_constant_pool ();
6154 #ifdef TEXT_SECTION_ASM_OP
6155 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
6156 TEXT_SECTION_ASM_OP);
6159 #ifdef DATA_SECTION_ASM_OP
6160 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
6161 DATA_SECTION_ASM_OP);
6164 #ifdef SDATA_SECTION_ASM_OP
6165 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
6166 SDATA_SECTION_ASM_OP);
6169 #ifdef READONLY_DATA_SECTION_ASM_OP
6170 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
6171 READONLY_DATA_SECTION_ASM_OP);
6174 #ifdef CTORS_SECTION_ASM_OP
6175 ctors_section = get_unnamed_section (0, output_section_asm_op,
6176 CTORS_SECTION_ASM_OP);
6179 #ifdef DTORS_SECTION_ASM_OP
6180 dtors_section = get_unnamed_section (0, output_section_asm_op,
6181 DTORS_SECTION_ASM_OP);
6184 #ifdef BSS_SECTION_ASM_OP
6185 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
6186 output_section_asm_op,
6187 BSS_SECTION_ASM_OP);
6190 #ifdef SBSS_SECTION_ASM_OP
6191 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
6192 output_section_asm_op,
6193 SBSS_SECTION_ASM_OP);
6196 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6197 | SECTION_COMMON, emit_tls_common);
6198 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6199 | SECTION_COMMON, emit_local);
6200 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6201 | SECTION_COMMON, emit_common);
6203 #if defined ASM_OUTPUT_ALIGNED_BSS
6204 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
6208 targetm.asm_out.init_sections ();
6210 if (readonly_data_section == NULL)
6211 readonly_data_section = text_section;
6213 #ifdef ASM_OUTPUT_EXTERNAL
6214 pending_assemble_externals_set = new hash_set<tree>;
6219 decl_default_tls_model (const_tree decl)
6221 enum tls_model kind;
6224 is_local = targetm.binds_local_p (decl);
6228 kind = TLS_MODEL_LOCAL_EXEC;
6230 kind = TLS_MODEL_INITIAL_EXEC;
6233 /* Local dynamic is inefficient when we're not combining the
6234 parts of the address. */
6235 else if (optimize && is_local)
6236 kind = TLS_MODEL_LOCAL_DYNAMIC;
6238 kind = TLS_MODEL_GLOBAL_DYNAMIC;
6239 if (kind < flag_tls_default)
6240 kind = flag_tls_default;
6245 /* Select a set of attributes for section NAME based on the properties
6246 of DECL and whether or not RELOC indicates that DECL's initializer
6247 might contain runtime relocations.
6249 We make the section read-only and executable for a function decl,
6250 read-only for a const data decl, and writable for a non-const data decl. */
6253 default_section_type_flags (tree decl, const char *name, int reloc)
6257 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
6258 flags = SECTION_CODE;
6261 enum section_category category
6262 = categorize_decl_for_section (decl, reloc);
6263 if (decl_readonly_section_1 (category))
6265 else if (category == SECCAT_DATA_REL_RO
6266 || category == SECCAT_DATA_REL_RO_LOCAL)
6267 flags = SECTION_WRITE | SECTION_RELRO;
6269 flags = SECTION_WRITE;
6273 flags = SECTION_WRITE;
6274 if (strcmp (name, ".data.rel.ro") == 0
6275 || strcmp (name, ".data.rel.ro.local") == 0)
6276 flags |= SECTION_RELRO;
6279 if (decl && DECL_P (decl) && DECL_COMDAT_GROUP (decl))
6280 flags |= SECTION_LINKONCE;
6282 if (strcmp (name, ".vtable_map_vars") == 0)
6283 flags |= SECTION_LINKONCE;
6285 if (decl && VAR_P (decl) && DECL_THREAD_LOCAL_P (decl))
6286 flags |= SECTION_TLS | SECTION_WRITE;
6288 if (strcmp (name, ".bss") == 0
6289 || strncmp (name, ".bss.", 5) == 0
6290 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
6291 || strcmp (name, ".persistent.bss") == 0
6292 || strcmp (name, ".sbss") == 0
6293 || strncmp (name, ".sbss.", 6) == 0
6294 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
6295 flags |= SECTION_BSS;
6297 if (strcmp (name, ".tdata") == 0
6298 || strncmp (name, ".tdata.", 7) == 0
6299 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
6300 flags |= SECTION_TLS;
6302 if (strcmp (name, ".tbss") == 0
6303 || strncmp (name, ".tbss.", 6) == 0
6304 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
6305 flags |= SECTION_TLS | SECTION_BSS;
6307 /* These three sections have special ELF types. They are neither
6308 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6309 want to print a section type (@progbits or @nobits). If someone
6310 is silly enough to emit code or TLS variables to one of these
6311 sections, then don't handle them specially. */
6312 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
6313 && (strcmp (name, ".init_array") == 0
6314 || strcmp (name, ".fini_array") == 0
6315 || strcmp (name, ".preinit_array") == 0))
6316 flags |= SECTION_NOTYPE;
6321 /* Return true if the target supports some form of global BSS,
6322 either through bss_noswitch_section, or by selecting a BSS
6323 section in TARGET_ASM_SELECT_SECTION. */
6326 have_global_bss_p (void)
6328 return bss_noswitch_section || targetm.have_switchable_bss_sections;
6331 /* Output assembly to switch to section NAME with attribute FLAGS.
6332 Four variants for common object file formats. */
6335 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
6336 unsigned int flags ATTRIBUTE_UNUSED,
6337 tree decl ATTRIBUTE_UNUSED)
6339 /* Some object formats don't support named sections at all. The
6340 front-end should already have flagged this as an error. */
6344 #ifndef TLS_SECTION_ASM_FLAG
6345 #define TLS_SECTION_ASM_FLAG 'T'
6349 default_elf_asm_named_section (const char *name, unsigned int flags,
6352 char flagchars[11], *f = flagchars;
6353 unsigned int numeric_value = 0;
6355 /* If we have already declared this section, we can use an
6356 abbreviated form to switch back to it -- unless this section is
6357 part of a COMDAT groups, in which case GAS requires the full
6358 declaration every time. */
6359 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6360 && (flags & SECTION_DECLARED))
6362 fprintf (asm_out_file, "\t.section\t%s\n", name);
6366 /* If we have a machine specific flag, then use the numeric value to pass
6368 if (targetm.asm_out.elf_flags_numeric (flags, &numeric_value))
6369 snprintf (f, sizeof (flagchars), "0x%08x", numeric_value);
6372 if (!(flags & SECTION_DEBUG))
6374 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6375 if (flags & SECTION_EXCLUDE)
6378 if (flags & SECTION_WRITE)
6380 if (flags & SECTION_CODE)
6382 if (flags & SECTION_SMALL)
6384 if (flags & SECTION_MERGE)
6386 if (flags & SECTION_STRINGS)
6388 if (flags & SECTION_TLS)
6389 *f++ = TLS_SECTION_ASM_FLAG;
6390 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6392 #ifdef MACH_DEP_SECTION_ASM_FLAG
6393 if (flags & SECTION_MACH_DEP)
6394 *f++ = MACH_DEP_SECTION_ASM_FLAG;
6399 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
6401 if (!(flags & SECTION_NOTYPE))
6406 if (flags & SECTION_BSS)
6412 /* On platforms that use "@" as the assembly comment character,
6414 if (strcmp (ASM_COMMENT_START, "@") == 0)
6416 fprintf (asm_out_file, format, type);
6418 if (flags & SECTION_ENTSIZE)
6419 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
6420 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6422 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6423 fprintf (asm_out_file, ",%s,comdat", IDENTIFIER_POINTER (decl));
6425 fprintf (asm_out_file, ",%s,comdat",
6426 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl)));
6430 putc ('\n', asm_out_file);
6434 default_coff_asm_named_section (const char *name, unsigned int flags,
6435 tree decl ATTRIBUTE_UNUSED)
6437 char flagchars[8], *f = flagchars;
6439 if (flags & SECTION_WRITE)
6441 if (flags & SECTION_CODE)
6445 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
6449 default_pe_asm_named_section (const char *name, unsigned int flags,
6452 default_coff_asm_named_section (name, flags, decl);
6454 if (flags & SECTION_LINKONCE)
6456 /* Functions may have been compiled at various levels of
6457 optimization so we can't use `same_size' here.
6458 Instead, have the linker pick one. */
6459 fprintf (asm_out_file, "\t.linkonce %s\n",
6460 (flags & SECTION_CODE ? "discard" : "same_size"));
6464 /* The lame default section selector. */
6467 default_select_section (tree decl, int reloc,
6468 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6472 if (decl_readonly_section (decl, reloc))
6473 return readonly_data_section;
6475 else if (TREE_CODE (decl) == CONSTRUCTOR)
6477 if (! ((flag_pic && reloc)
6478 || !TREE_READONLY (decl)
6479 || TREE_SIDE_EFFECTS (decl)
6480 || !TREE_CONSTANT (decl)))
6481 return readonly_data_section;
6483 else if (TREE_CODE (decl) == STRING_CST)
6484 return readonly_data_section;
6485 else if (! (flag_pic && reloc))
6486 return readonly_data_section;
6488 return data_section;
6491 enum section_category
6492 categorize_decl_for_section (const_tree decl, int reloc)
6494 enum section_category ret;
6496 if (TREE_CODE (decl) == FUNCTION_DECL)
6498 else if (TREE_CODE (decl) == STRING_CST)
6500 if ((flag_sanitize & SANITIZE_ADDRESS)
6501 && asan_protect_global (CONST_CAST_TREE (decl)))
6502 /* or !flag_merge_constants */
6503 return SECCAT_RODATA;
6505 return SECCAT_RODATA_MERGE_STR;
6507 else if (VAR_P (decl))
6509 if (bss_initializer_p (decl))
6511 else if (! TREE_READONLY (decl)
6512 || TREE_SIDE_EFFECTS (decl)
6513 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
6515 /* Here the reloc_rw_mask is not testing whether the section should
6516 be read-only or not, but whether the dynamic link will have to
6517 do something. If so, we wish to segregate the data in order to
6518 minimize cache misses inside the dynamic linker. */
6519 if (reloc & targetm.asm_out.reloc_rw_mask ())
6520 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
6524 else if (reloc & targetm.asm_out.reloc_rw_mask ())
6525 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
6526 else if (reloc || flag_merge_constants < 2
6527 || ((flag_sanitize & SANITIZE_ADDRESS)
6528 && asan_protect_global (CONST_CAST_TREE (decl))))
6529 /* C and C++ don't allow different variables to share the same
6530 location. -fmerge-all-constants allows even that (at the
6531 expense of not conforming). */
6532 ret = SECCAT_RODATA;
6533 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
6534 ret = SECCAT_RODATA_MERGE_STR_INIT;
6536 ret = SECCAT_RODATA_MERGE_CONST;
6538 else if (TREE_CODE (decl) == CONSTRUCTOR)
6540 if ((reloc & targetm.asm_out.reloc_rw_mask ())
6541 || TREE_SIDE_EFFECTS (decl)
6542 || ! TREE_CONSTANT (decl))
6545 ret = SECCAT_RODATA;
6548 ret = SECCAT_RODATA;
6550 /* There are no read-only thread-local sections. */
6551 if (VAR_P (decl) && DECL_THREAD_LOCAL_P (decl))
6553 /* Note that this would be *just* SECCAT_BSS, except that there's
6554 no concept of a read-only thread-local-data section. */
6555 if (ret == SECCAT_BSS
6556 || (flag_zero_initialized_in_bss
6557 && initializer_zerop (DECL_INITIAL (decl))))
6563 /* If the target uses small data sections, select it. */
6564 else if (targetm.in_small_data_p (decl))
6566 if (ret == SECCAT_BSS)
6568 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
6569 ret = SECCAT_SRODATA;
6578 decl_readonly_section_1 (enum section_category category)
6583 case SECCAT_RODATA_MERGE_STR:
6584 case SECCAT_RODATA_MERGE_STR_INIT:
6585 case SECCAT_RODATA_MERGE_CONST:
6586 case SECCAT_SRODATA:
6594 decl_readonly_section (const_tree decl, int reloc)
6596 return decl_readonly_section_1 (categorize_decl_for_section (decl, reloc));
6599 /* Select a section based on the above categorization. */
6602 default_elf_select_section (tree decl, int reloc,
6603 unsigned HOST_WIDE_INT align)
6606 switch (categorize_decl_for_section (decl, reloc))
6609 /* We're not supposed to be called on FUNCTION_DECLs. */
6612 return readonly_data_section;
6613 case SECCAT_RODATA_MERGE_STR:
6614 return mergeable_string_section (decl, align, 0);
6615 case SECCAT_RODATA_MERGE_STR_INIT:
6616 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
6617 case SECCAT_RODATA_MERGE_CONST:
6618 return mergeable_constant_section (DECL_MODE (decl), align, 0);
6619 case SECCAT_SRODATA:
6623 return data_section;
6624 case SECCAT_DATA_REL:
6625 sname = ".data.rel";
6627 case SECCAT_DATA_REL_LOCAL:
6628 sname = ".data.rel.local";
6630 case SECCAT_DATA_REL_RO:
6631 sname = ".data.rel.ro";
6633 case SECCAT_DATA_REL_RO_LOCAL:
6634 sname = ".data.rel.ro.local";
6657 return get_named_section (decl, sname, reloc);
6660 /* Construct a unique section name based on the decl name and the
6661 categorization performed above. */
6664 default_unique_section (tree decl, int reloc)
6666 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6667 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
6668 const char *prefix, *name, *linkonce;
6672 switch (categorize_decl_for_section (decl, reloc))
6675 prefix = one_only ? ".t" : ".text";
6678 case SECCAT_RODATA_MERGE_STR:
6679 case SECCAT_RODATA_MERGE_STR_INIT:
6680 case SECCAT_RODATA_MERGE_CONST:
6681 prefix = one_only ? ".r" : ".rodata";
6683 case SECCAT_SRODATA:
6684 prefix = one_only ? ".s2" : ".sdata2";
6687 prefix = one_only ? ".d" : ".data";
6689 case SECCAT_DATA_REL:
6690 prefix = one_only ? ".d.rel" : ".data.rel";
6692 case SECCAT_DATA_REL_LOCAL:
6693 prefix = one_only ? ".d.rel.local" : ".data.rel.local";
6695 case SECCAT_DATA_REL_RO:
6696 prefix = one_only ? ".d.rel.ro" : ".data.rel.ro";
6698 case SECCAT_DATA_REL_RO_LOCAL:
6699 prefix = one_only ? ".d.rel.ro.local" : ".data.rel.ro.local";
6702 prefix = one_only ? ".s" : ".sdata";
6705 prefix = one_only ? ".b" : ".bss";
6708 prefix = one_only ? ".sb" : ".sbss";
6711 prefix = one_only ? ".td" : ".tdata";
6714 prefix = one_only ? ".tb" : ".tbss";
6720 id = DECL_ASSEMBLER_NAME (decl);
6721 ultimate_transparent_alias_target (&id);
6722 name = IDENTIFIER_POINTER (id);
6723 name = targetm.strip_name_encoding (name);
6725 /* If we're using one_only, then there needs to be a .gnu.linkonce
6726 prefix to the section name. */
6727 linkonce = one_only ? ".gnu.linkonce" : "";
6729 string = ACONCAT ((linkonce, prefix, ".", name, NULL));
6731 set_decl_section_name (decl, string);
6734 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6737 compute_reloc_for_rtx_1 (const_rtx x)
6739 switch (GET_CODE (x))
6742 return SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
6750 /* Like compute_reloc_for_constant, except for an RTX. The return value
6751 is a mask for which bit 1 indicates a global relocation, and bit 0
6752 indicates a local relocation. */
6755 compute_reloc_for_rtx (const_rtx x)
6757 switch (GET_CODE (x))
6761 return compute_reloc_for_rtx_1 (x);
6766 subrtx_iterator::array_type array;
6767 FOR_EACH_SUBRTX (iter, array, x, ALL)
6768 reloc |= compute_reloc_for_rtx_1 (*iter);
6778 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED,
6780 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6782 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
6783 return data_section;
6785 return readonly_data_section;
6789 default_elf_select_rtx_section (machine_mode mode, rtx x,
6790 unsigned HOST_WIDE_INT align)
6792 int reloc = compute_reloc_for_rtx (x);
6794 /* ??? Handle small data here somehow. */
6796 if (reloc & targetm.asm_out.reloc_rw_mask ())
6799 return get_named_section (NULL, ".data.rel.ro.local", 1);
6801 return get_named_section (NULL, ".data.rel.ro", 3);
6804 return mergeable_constant_section (mode, align, 0);
6807 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6810 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
6815 /* Careful not to prod global register variables. */
6818 symbol = XEXP (rtl, 0);
6819 if (GET_CODE (symbol) != SYMBOL_REF)
6822 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
6823 if (TREE_CODE (decl) == FUNCTION_DECL)
6824 flags |= SYMBOL_FLAG_FUNCTION;
6825 if (targetm.binds_local_p (decl))
6826 flags |= SYMBOL_FLAG_LOCAL;
6827 if (VAR_P (decl) && DECL_THREAD_LOCAL_P (decl))
6828 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
6829 else if (targetm.in_small_data_p (decl))
6830 flags |= SYMBOL_FLAG_SMALL;
6831 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6832 being PUBLIC, the thing *must* be defined in this translation unit.
6833 Prevent this buglet from being propagated into rtl code as well. */
6834 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
6835 flags |= SYMBOL_FLAG_EXTERNAL;
6837 SYMBOL_REF_FLAGS (symbol) = flags;
6840 /* By default, we do nothing for encode_section_info, so we need not
6841 do anything but discard the '*' marker. */
6844 default_strip_name_encoding (const char *str)
6846 return str + (*str == '*');
6849 #ifdef ASM_OUTPUT_DEF
6850 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6851 anchor relative to ".", the current section position. */
6854 default_asm_output_anchor (rtx symbol)
6858 sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
6859 SYMBOL_REF_BLOCK_OFFSET (symbol));
6860 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
6864 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6867 default_use_anchors_for_symbol_p (const_rtx symbol)
6872 /* Don't use anchors for mergeable sections. The linker might move
6873 the objects around. */
6874 sect = SYMBOL_REF_BLOCK (symbol)->sect;
6875 if (sect->common.flags & SECTION_MERGE)
6878 /* Don't use anchors for small data sections. The small data register
6879 acts as an anchor for such sections. */
6880 if (sect->common.flags & SECTION_SMALL)
6883 decl = SYMBOL_REF_DECL (symbol);
6884 if (decl && DECL_P (decl))
6886 /* Don't use section anchors for decls that might be defined or
6887 usurped by other modules. */
6888 if (TREE_PUBLIC (decl) && !decl_binds_to_current_def_p (decl))
6891 /* Don't use section anchors for decls that will be placed in a
6892 small data section. */
6893 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6894 one above. The problem is that we only use SECTION_SMALL for
6895 sections that should be marked as small in the section directive. */
6896 if (targetm.in_small_data_p (decl))
6899 /* Don't use section anchors for decls that won't fit inside a single
6900 anchor range to reduce the amount of instructions required to refer
6901 to the entire declaration. */
6902 if (DECL_SIZE_UNIT (decl) == NULL_TREE
6903 || !tree_fits_uhwi_p (DECL_SIZE_UNIT (decl))
6904 || (tree_to_uhwi (DECL_SIZE_UNIT (decl))
6905 >= (unsigned HOST_WIDE_INT) targetm.max_anchor_offset))
6912 /* Return true when RESOLUTION indicate that symbol will be bound to the
6913 definition provided by current .o file. */
6916 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution)
6918 return (resolution == LDPR_PREVAILING_DEF
6919 || resolution == LDPR_PREVAILING_DEF_IRONLY_EXP
6920 || resolution == LDPR_PREVAILING_DEF_IRONLY);
6923 /* Return true when RESOLUTION indicate that symbol will be bound locally
6924 within current executable or DSO. */
6927 resolution_local_p (enum ld_plugin_symbol_resolution resolution)
6929 return (resolution == LDPR_PREVAILING_DEF
6930 || resolution == LDPR_PREVAILING_DEF_IRONLY
6931 || resolution == LDPR_PREVAILING_DEF_IRONLY_EXP
6932 || resolution == LDPR_PREEMPTED_REG
6933 || resolution == LDPR_PREEMPTED_IR
6934 || resolution == LDPR_RESOLVED_IR
6935 || resolution == LDPR_RESOLVED_EXEC);
6938 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6939 uninitialized common symbol in the executable will still be defined
6940 (through COPY relocation) in the executable. */
6943 default_binds_local_p_3 (const_tree exp, bool shlib, bool weak_dominate,
6944 bool extern_protected_data, bool common_local_p)
6946 /* A non-decl is an entry in the constant pool. */
6950 /* Weakrefs may not bind locally, even though the weakref itself is always
6951 static and therefore local. Similarly, the resolver for ifunc functions
6952 might resolve to a non-local function.
6953 FIXME: We can resolve the weakref case more curefuly by looking at the
6955 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp))
6956 || (TREE_CODE (exp) == FUNCTION_DECL
6957 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp))))
6960 /* Static variables are always local. */
6961 if (! TREE_PUBLIC (exp))
6964 /* With resolution file in hand, take look into resolutions.
6965 We can't just return true for resolved_locally symbols,
6966 because dynamic linking might overwrite symbols
6967 in shared libraries. */
6968 bool resolved_locally = false;
6970 bool uninited_common = (DECL_COMMON (exp)
6971 && (DECL_INITIAL (exp) == NULL
6973 && DECL_INITIAL (exp) == error_mark_node)));
6975 /* A non-external variable is defined locally only if it isn't
6976 uninitialized COMMON variable or common_local_p is true. */
6977 bool defined_locally = (!DECL_EXTERNAL (exp)
6978 && (!uninited_common || common_local_p));
6979 if (symtab_node *node = symtab_node::get (exp))
6981 if (node->in_other_partition)
6982 defined_locally = true;
6983 if (node->can_be_discarded_p ())
6985 else if (resolution_to_local_definition_p (node->resolution))
6986 defined_locally = resolved_locally = true;
6987 else if (resolution_local_p (node->resolution))
6988 resolved_locally = true;
6990 if (defined_locally && weak_dominate && !shlib)
6991 resolved_locally = true;
6993 /* Undefined weak symbols are never defined locally. */
6994 if (DECL_WEAK (exp) && !defined_locally)
6997 /* A symbol is local if the user has said explicitly that it will be,
6998 or if we have a definition for the symbol. We cannot infer visibility
6999 for undefined symbols. */
7000 if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT
7001 && (TREE_CODE (exp) == FUNCTION_DECL
7002 || !extern_protected_data
7003 || DECL_VISIBILITY (exp) != VISIBILITY_PROTECTED)
7004 && (DECL_VISIBILITY_SPECIFIED (exp) || defined_locally))
7007 /* If PIC, then assume that any global name can be overridden by
7008 symbols resolved from other modules. */
7012 /* Variables defined outside this object might not be local. */
7013 if (DECL_EXTERNAL (exp) && !resolved_locally)
7016 /* Non-dominant weak symbols are not defined locally. */
7017 if (DECL_WEAK (exp) && !resolved_locally)
7020 /* Uninitialized COMMON variable may be unified with symbols
7021 resolved from other modules. */
7022 if (uninited_common && !resolved_locally)
7025 /* Otherwise we're left with initialized (or non-common) global data
7026 which is of necessity defined locally. */
7030 /* Assume ELF-ish defaults, since that's pretty much the most liberal
7031 wrt cross-module name binding. */
7034 default_binds_local_p (const_tree exp)
7036 return default_binds_local_p_3 (exp, flag_shlib != 0, true, false, false);
7039 /* Similar to default_binds_local_p, but common symbol may be local and
7040 extern protected data is non-local. */
7043 default_binds_local_p_2 (const_tree exp)
7045 return default_binds_local_p_3 (exp, flag_shlib != 0, true, true,
7050 default_binds_local_p_1 (const_tree exp, int shlib)
7052 return default_binds_local_p_3 (exp, shlib != 0, false, false, false);
7055 /* Return true when references to DECL must bind to current definition in
7058 The condition is usually equivalent to whether the function binds to the
7059 current module (shared library or executable), that is to binds_local_p.
7060 We use this fact to avoid need for another target hook and implement
7061 the logic using binds_local_p and just special cases where
7062 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
7063 the weak definitions (that can be overwritten at linktime by other
7064 definition from different object file) and when resolution info is available
7065 we simply use the knowledge passed to us by linker plugin. */
7067 decl_binds_to_current_def_p (const_tree decl)
7069 gcc_assert (DECL_P (decl));
7070 if (!targetm.binds_local_p (decl))
7072 if (!TREE_PUBLIC (decl))
7075 /* When resolution is available, just use it. */
7076 if (symtab_node *node = symtab_node::get (decl))
7078 if (node->resolution != LDPR_UNKNOWN
7079 && !node->can_be_discarded_p ())
7080 return resolution_to_local_definition_p (node->resolution);
7083 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
7084 binds locally but still can be overwritten), DECL_COMMON (can be merged
7085 with a non-common definition somewhere in the same module) or
7087 This rely on fact that binds_local_p behave as decl_replaceable_p
7088 for all other declaration types. */
7089 if (DECL_WEAK (decl))
7091 if (DECL_COMMON (decl)
7092 && (DECL_INITIAL (decl) == NULL
7093 || (!in_lto_p && DECL_INITIAL (decl) == error_mark_node)))
7095 if (DECL_EXTERNAL (decl))
7100 /* A replaceable function or variable is one which may be replaced
7101 at link-time with an entirely different definition, provided that the
7102 replacement has the same type. For example, functions declared
7103 with __attribute__((weak)) on most systems are replaceable.
7105 COMDAT functions are not replaceable, since all definitions of the
7106 function must be equivalent. It is important that COMDAT functions
7107 not be treated as replaceable so that use of C++ template
7108 instantiations is not penalized. */
7111 decl_replaceable_p (tree decl)
7113 gcc_assert (DECL_P (decl));
7114 if (!TREE_PUBLIC (decl) || DECL_COMDAT (decl))
7116 if (!flag_semantic_interposition
7117 && !DECL_WEAK (decl))
7119 return !decl_binds_to_current_def_p (decl);
7122 /* Default function to output code that will globalize a label. A
7123 target must define GLOBAL_ASM_OP or provide its own function to
7124 globalize a label. */
7125 #ifdef GLOBAL_ASM_OP
7127 default_globalize_label (FILE * stream, const char *name)
7129 fputs (GLOBAL_ASM_OP, stream);
7130 assemble_name (stream, name);
7131 putc ('\n', stream);
7133 #endif /* GLOBAL_ASM_OP */
7135 /* Default function to output code that will globalize a declaration. */
7137 default_globalize_decl_name (FILE * stream, tree decl)
7139 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
7140 targetm.asm_out.globalize_label (stream, name);
7143 /* Default function to output a label for unwind information. The
7144 default is to do nothing. A target that needs nonlocal labels for
7145 unwind information must provide its own function to do this. */
7147 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
7148 tree decl ATTRIBUTE_UNUSED,
7149 int for_eh ATTRIBUTE_UNUSED,
7150 int empty ATTRIBUTE_UNUSED)
7154 /* Default function to output a label to divide up the exception table.
7155 The default is to do nothing. A target that needs/wants to divide
7156 up the table must provide it's own function to do this. */
7158 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
7162 /* This is how to output an internal numbered label where PREFIX is
7163 the class of label and LABELNO is the number within the class. */
7166 default_generate_internal_label (char *buf, const char *prefix,
7167 unsigned long labelno)
7169 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
7172 /* This is how to output an internal numbered label where PREFIX is
7173 the class of label and LABELNO is the number within the class. */
7176 default_internal_label (FILE *stream, const char *prefix,
7177 unsigned long labelno)
7179 char *const buf = (char *) alloca (40 + strlen (prefix));
7180 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
7181 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
7185 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7188 default_asm_declare_constant_name (FILE *file, const char *name,
7189 const_tree exp ATTRIBUTE_UNUSED,
7190 HOST_WIDE_INT size ATTRIBUTE_UNUSED)
7192 assemble_label (file, name);
7195 /* This is the default behavior at the beginning of a file. It's
7196 controlled by two other target-hook toggles. */
7198 default_file_start (void)
7200 if (targetm.asm_file_start_app_off
7201 && !(flag_verbose_asm || flag_debug_asm || flag_dump_rtl_in_asm))
7202 fputs (ASM_APP_OFF, asm_out_file);
7204 if (targetm.asm_file_start_file_directive)
7206 /* LTO produced units have no meaningful main_input_filename. */
7208 output_file_directive (asm_out_file, "<artificial>");
7210 output_file_directive (asm_out_file, main_input_filename);
7214 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7215 which emits a special section directive used to indicate whether or
7216 not this object file needs an executable stack. This is primarily
7217 a GNU extension to ELF but could be used on other targets. */
7219 int trampolines_created;
7222 file_end_indicate_exec_stack (void)
7224 unsigned int flags = SECTION_DEBUG;
7225 if (trampolines_created)
7226 flags |= SECTION_CODE;
7228 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
7231 /* Emit a special section directive to indicate that this object file
7232 was compiled with -fsplit-stack. This is used to let the linker
7233 detect calls between split-stack code and non-split-stack code, so
7234 that it can modify the split-stack code to allocate a sufficiently
7235 large stack. We emit another special section if there are any
7236 functions in this file which have the no_split_stack attribute, to
7237 prevent the linker from warning about being unable to convert the
7238 functions if they call non-split-stack code. */
7241 file_end_indicate_split_stack (void)
7243 if (flag_split_stack)
7245 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG,
7247 if (saw_no_split_stack)
7248 switch_to_section (get_section (".note.GNU-no-split-stack",
7249 SECTION_DEBUG, NULL));
7253 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7254 a get_unnamed_section callback. */
7257 output_section_asm_op (const void *directive)
7259 fprintf (asm_out_file, "%s\n", (const char *) directive);
7262 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7263 the current section is NEW_SECTION. */
7266 switch_to_section (section *new_section)
7268 if (in_section == new_section)
7271 if (new_section->common.flags & SECTION_FORGET)
7274 in_section = new_section;
7276 switch (SECTION_STYLE (new_section))
7279 targetm.asm_out.named_section (new_section->named.name,
7280 new_section->named.common.flags,
7281 new_section->named.decl);
7284 case SECTION_UNNAMED:
7285 new_section->unnamed.callback (new_section->unnamed.data);
7288 case SECTION_NOSWITCH:
7293 new_section->common.flags |= SECTION_DECLARED;
7296 /* If block symbol SYMBOL has not yet been assigned an offset, place
7297 it at the end of its block. */
7300 place_block_symbol (rtx symbol)
7302 unsigned HOST_WIDE_INT size, mask, offset;
7303 struct constant_descriptor_rtx *desc;
7304 unsigned int alignment;
7305 struct object_block *block;
7308 gcc_assert (SYMBOL_REF_BLOCK (symbol));
7309 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
7312 /* Work out the symbol's size and alignment. */
7313 if (CONSTANT_POOL_ADDRESS_P (symbol))
7315 desc = SYMBOL_REF_CONSTANT (symbol);
7316 alignment = desc->align;
7317 size = GET_MODE_SIZE (desc->mode);
7319 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
7321 decl = SYMBOL_REF_DECL (symbol);
7322 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl));
7323 alignment = DECL_ALIGN (decl);
7324 size = get_constant_size (DECL_INITIAL (decl));
7325 if ((flag_sanitize & SANITIZE_ADDRESS)
7326 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
7327 && asan_protect_global (DECL_INITIAL (decl)))
7329 size += asan_red_zone_size (size);
7330 alignment = MAX (alignment,
7331 ASAN_RED_ZONE_SIZE * BITS_PER_UNIT);
7336 struct symtab_node *snode;
7337 decl = SYMBOL_REF_DECL (symbol);
7339 snode = symtab_node::get (decl);
7342 rtx target = DECL_RTL (snode->ultimate_alias_target ()->decl);
7344 gcc_assert (MEM_P (target)
7345 && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
7346 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target, 0)));
7347 target = XEXP (target, 0);
7348 place_block_symbol (target);
7349 SYMBOL_REF_BLOCK_OFFSET (symbol) = SYMBOL_REF_BLOCK_OFFSET (target);
7352 alignment = get_variable_align (decl);
7353 size = tree_to_uhwi (DECL_SIZE_UNIT (decl));
7354 if ((flag_sanitize & SANITIZE_ADDRESS)
7355 && asan_protect_global (decl))
7357 size += asan_red_zone_size (size);
7358 alignment = MAX (alignment,
7359 ASAN_RED_ZONE_SIZE * BITS_PER_UNIT);
7363 /* Calculate the object's offset from the start of the block. */
7364 block = SYMBOL_REF_BLOCK (symbol);
7365 mask = alignment / BITS_PER_UNIT - 1;
7366 offset = (block->size + mask) & ~mask;
7367 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
7369 /* Record the block's new alignment and size. */
7370 block->alignment = MAX (block->alignment, alignment);
7371 block->size = offset + size;
7373 vec_safe_push (block->objects, symbol);
7376 /* Return the anchor that should be used to address byte offset OFFSET
7377 from the first object in BLOCK. MODEL is the TLS model used
7381 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
7382 enum tls_model model)
7385 unsigned int begin, middle, end;
7386 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
7389 /* Work out the anchor's offset. Use an offset of 0 for the first
7390 anchor so that we don't pessimize the case where we take the address
7391 of a variable at the beginning of the block. This is particularly
7392 useful when a block has only one variable assigned to it.
7394 We try to place anchors RANGE bytes apart, so there can then be
7395 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7396 a ptr_mode offset. With some target settings, the lowest such
7397 anchor might be out of range for the lowest ptr_mode offset;
7398 likewise the highest anchor for the highest offset. Use anchors
7399 at the extreme ends of the ptr_mode range in such cases.
7401 All arithmetic uses unsigned integers in order to avoid
7403 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
7404 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
7405 range = max_offset - min_offset + 1;
7410 bias = HOST_WIDE_INT_1U << (GET_MODE_BITSIZE (ptr_mode) - 1);
7413 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
7414 delta -= delta % range;
7417 offset = (HOST_WIDE_INT) (-delta);
7421 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
7422 delta -= delta % range;
7423 if (delta > bias - 1)
7425 offset = (HOST_WIDE_INT) delta;
7429 /* Do a binary search to see if there's already an anchor we can use.
7430 Set BEGIN to the new anchor's index if not. */
7432 end = vec_safe_length (block->anchors);
7433 while (begin != end)
7435 middle = (end + begin) / 2;
7436 anchor = (*block->anchors)[middle];
7437 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
7439 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
7441 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
7443 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
7449 /* Create a new anchor with a unique label. */
7450 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
7451 anchor = create_block_symbol (ggc_strdup (label), block, offset);
7452 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
7453 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
7455 /* Insert it at index BEGIN. */
7456 vec_safe_insert (block->anchors, begin, anchor);
7460 /* Output the objects in BLOCK. */
7463 output_object_block (struct object_block *block)
7465 struct constant_descriptor_rtx *desc;
7467 HOST_WIDE_INT offset;
7471 if (!block->objects)
7474 /* Switch to the section and make sure that the first byte is
7475 suitably aligned. */
7476 /* Special case VTV comdat sections similar to assemble_variable. */
7477 if (SECTION_STYLE (block->sect) == SECTION_NAMED
7478 && block->sect->named.name
7479 && (strcmp (block->sect->named.name, ".vtable_map_vars") == 0))
7480 handle_vtv_comdat_section (block->sect, block->sect->named.decl);
7482 switch_to_section (block->sect);
7484 assemble_align (block->alignment);
7486 /* Define the values of all anchors relative to the current section
7488 FOR_EACH_VEC_SAFE_ELT (block->anchors, i, symbol)
7489 targetm.asm_out.output_anchor (symbol);
7491 /* Output the objects themselves. */
7493 FOR_EACH_VEC_ELT (*block->objects, i, symbol)
7495 /* Move to the object's offset, padding with zeros if necessary. */
7496 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
7497 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
7498 if (CONSTANT_POOL_ADDRESS_P (symbol))
7500 desc = SYMBOL_REF_CONSTANT (symbol);
7501 /* Pass 1 for align as we have already laid out everything in the block.
7502 So aligning shouldn't be necessary. */
7503 output_constant_pool_1 (desc, 1);
7504 offset += GET_MODE_SIZE (desc->mode);
7506 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
7509 decl = SYMBOL_REF_DECL (symbol);
7510 assemble_constant_contents
7511 (DECL_INITIAL (decl), XSTR (symbol, 0), DECL_ALIGN (decl));
7513 size = get_constant_size (DECL_INITIAL (decl));
7515 if ((flag_sanitize & SANITIZE_ADDRESS)
7516 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
7517 && asan_protect_global (DECL_INITIAL (decl)))
7519 size = asan_red_zone_size (size);
7520 assemble_zeros (size);
7527 decl = SYMBOL_REF_DECL (symbol);
7528 assemble_variable_contents (decl, XSTR (symbol, 0), false);
7529 size = tree_to_uhwi (DECL_SIZE_UNIT (decl));
7531 if ((flag_sanitize & SANITIZE_ADDRESS)
7532 && asan_protect_global (decl))
7534 size = asan_red_zone_size (size);
7535 assemble_zeros (size);
7542 /* A callback for qsort to compare object_blocks. */
7545 output_object_block_compare (const void *x, const void *y)
7547 object_block *p1 = *(object_block * const*)x;
7548 object_block *p2 = *(object_block * const*)y;
7550 if (p1->sect->common.flags & SECTION_NAMED
7551 && !(p2->sect->common.flags & SECTION_NAMED))
7554 if (!(p1->sect->common.flags & SECTION_NAMED)
7555 && p2->sect->common.flags & SECTION_NAMED)
7558 if (p1->sect->common.flags & SECTION_NAMED
7559 && p2->sect->common.flags & SECTION_NAMED)
7560 return strcmp (p1->sect->named.name, p2->sect->named.name);
7562 unsigned f1 = p1->sect->common.flags;
7563 unsigned f2 = p2->sect->common.flags;
7566 return f1 < f2 ? -1 : 1;
7569 /* Output the definitions of all object_blocks. */
7572 output_object_blocks (void)
7574 vec<object_block *, va_heap> v;
7575 v.create (object_block_htab->elements ());
7577 hash_table<object_block_hasher>::iterator hi;
7579 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab, obj, object_block *, hi)
7582 /* Sort them in order to output them in a deterministic manner,
7583 otherwise we may get .rodata sections in different orders with
7585 v.qsort (output_object_block_compare);
7587 FOR_EACH_VEC_ELT (v, i, obj)
7588 output_object_block (obj);
7593 /* This function provides a possible implementation of the
7594 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7595 by -frecord-gcc-switches it creates a new mergeable, string section in the
7596 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7597 contains the switches in ASCII format.
7599 FIXME: This code does not correctly handle double quote characters
7600 that appear inside strings, (it strips them rather than preserving them).
7601 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7602 characters - instead it treats them as sub-string separators. Since
7603 we want to emit NUL strings terminators into the object file we have to use
7607 elf_record_gcc_switches (print_switch_type type, const char * name)
7611 case SWITCH_TYPE_PASSED:
7612 ASM_OUTPUT_ASCII (asm_out_file, name, strlen (name));
7613 ASM_OUTPUT_SKIP (asm_out_file, HOST_WIDE_INT_1U);
7616 case SWITCH_TYPE_DESCRIPTIVE:
7619 /* Distinguish between invocations where name is NULL. */
7620 static bool started = false;
7626 sec = get_section (targetm.asm_out.record_gcc_switches_section,
7630 | (SECTION_ENTSIZE & 1),
7632 switch_to_section (sec);
7641 /* The return value is currently ignored by the caller, but must be 0.
7642 For -fverbose-asm the return value would be the number of characters
7643 emitted into the assembler file. */
7647 /* Emit text to declare externally defined symbols. It is needed to
7648 properly support non-default visibility. */
7650 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
7652 const char *name ATTRIBUTE_UNUSED)
7654 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7655 set in order to avoid putting out names that are never really
7656 used. Always output visibility specified in the source. */
7657 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
7658 && (DECL_VISIBILITY_SPECIFIED (decl)
7659 || targetm.binds_local_p (decl)))
7660 maybe_assemble_visibility (decl);
7663 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7666 default_asm_output_source_filename (FILE *file, const char *name)
7668 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7669 ASM_OUTPUT_SOURCE_FILENAME (file, name);
7671 fprintf (file, "\t.file\t");
7672 output_quoted_string (file, name);
7677 /* Output a file name in the form wanted by System V. */
7680 output_file_directive (FILE *asm_file, const char *input_name)
7685 if (input_name == NULL)
7686 input_name = "<stdin>";
7688 input_name = remap_debug_filename (input_name);
7690 len = strlen (input_name);
7691 na = input_name + len;
7693 /* NA gets INPUT_NAME sans directory names. */
7694 while (na > input_name)
7696 if (IS_DIR_SEPARATOR (na[-1]))
7701 targetm.asm_out.output_source_filename (asm_file, na);
7704 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7707 make_debug_expr_from_rtl (const_rtx exp)
7709 tree ddecl = make_node (DEBUG_EXPR_DECL), type;
7710 machine_mode mode = GET_MODE (exp);
7713 DECL_ARTIFICIAL (ddecl) = 1;
7714 if (REG_P (exp) && REG_EXPR (exp))
7715 type = TREE_TYPE (REG_EXPR (exp));
7716 else if (MEM_P (exp) && MEM_EXPR (exp))
7717 type = TREE_TYPE (MEM_EXPR (exp));
7720 if (type && TYPE_MODE (type) == mode)
7721 TREE_TYPE (ddecl) = type;
7723 TREE_TYPE (ddecl) = lang_hooks.types.type_for_mode (mode, 1);
7724 SET_DECL_MODE (ddecl, mode);
7725 dval = gen_rtx_DEBUG_EXPR (mode);
7726 DEBUG_EXPR_TREE_DECL (dval) = ddecl;
7727 SET_DECL_RTL (ddecl, dval);
7731 #ifdef ELF_ASCII_ESCAPES
7732 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7735 default_elf_asm_output_limited_string (FILE *f, const char *s)
7740 fputs (STRING_ASM_OP, f);
7745 escape = ELF_ASCII_ESCAPES[c];
7753 putc ('0'+((c>>6)&7), f);
7754 putc ('0'+((c>>3)&7), f);
7755 putc ('0'+(c&7), f);
7768 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7771 default_elf_asm_output_ascii (FILE *f, const char *s, unsigned int len)
7773 const char *limit = s + len;
7774 const char *last_null = NULL;
7775 unsigned bytes_in_chunk = 0;
7779 for (; s < limit; s++)
7783 if (bytes_in_chunk >= 60)
7792 for (p = s; p < limit && *p != '\0'; p++)
7799 if (p < limit && (p - s) <= (long) ELF_STRING_LIMIT)
7801 if (bytes_in_chunk > 0)
7808 default_elf_asm_output_limited_string (f, s);
7813 if (bytes_in_chunk == 0)
7814 fputs (ASCII_DATA_ASM_OP "\"", f);
7817 escape = ELF_ASCII_ESCAPES[c];
7826 putc ('0'+((c>>6)&7), f);
7827 putc ('0'+((c>>3)&7), f);
7828 putc ('0'+(c&7), f);
7829 bytes_in_chunk += 4;
7834 bytes_in_chunk += 2;
7841 if (bytes_in_chunk > 0)
7849 static GTY(()) section *elf_init_array_section;
7850 static GTY(()) section *elf_fini_array_section;
7853 get_elf_initfini_array_priority_section (int priority,
7857 if (priority != DEFAULT_INIT_PRIORITY)
7860 sprintf (buf, "%s.%.5u",
7861 constructor_p ? ".init_array" : ".fini_array",
7863 sec = get_section (buf, SECTION_WRITE | SECTION_NOTYPE, NULL_TREE);
7869 if (elf_init_array_section == NULL)
7870 elf_init_array_section
7871 = get_section (".init_array",
7872 SECTION_WRITE | SECTION_NOTYPE, NULL_TREE);
7873 sec = elf_init_array_section;
7877 if (elf_fini_array_section == NULL)
7878 elf_fini_array_section
7879 = get_section (".fini_array",
7880 SECTION_WRITE | SECTION_NOTYPE, NULL_TREE);
7881 sec = elf_fini_array_section;
7887 /* Use .init_array section for constructors. */
7890 default_elf_init_array_asm_out_constructor (rtx symbol, int priority)
7892 section *sec = get_elf_initfini_array_priority_section (priority,
7894 assemble_addr_to_section (symbol, sec);
7897 /* Use .fini_array section for destructors. */
7900 default_elf_fini_array_asm_out_destructor (rtx symbol, int priority)
7902 section *sec = get_elf_initfini_array_priority_section (priority,
7904 assemble_addr_to_section (symbol, sec);
7907 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7909 This is a bit of a cheat. The real default is a no-op, but this
7910 hook is the default for all targets with a .ident directive. */
7913 default_asm_output_ident_directive (const char *ident_str)
7915 const char *ident_asm_op = "\t.ident\t";
7917 /* If we are still in the front end, do not write out the string
7918 to asm_out_file. Instead, add a fake top-level asm statement.
7919 This allows the front ends to use this hook without actually
7920 writing to asm_out_file, to handle #ident or Pragma Ident. */
7921 if (symtab->state == PARSING)
7923 char *buf = ACONCAT ((ident_asm_op, "\"", ident_str, "\"\n", NULL));
7924 symtab->finalize_toplevel_asm (build_string (strlen (buf), buf));
7927 fprintf (asm_out_file, "%s\"%s\"\n", ident_asm_op, ident_str);
7931 /* This function ensures that vtable_map variables are not only
7932 in the comdat section, but that each variable has its own unique
7933 comdat name. Without this the variables end up in the same section
7934 with a single comdat name.
7936 FIXME: resolve_unique_section needs to deal better with
7937 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
7938 that is fixed, this if-else statement can be replaced with
7939 a single call to "switch_to_section (sect)". */
7942 handle_vtv_comdat_section (section *sect, const_tree decl ATTRIBUTE_UNUSED)
7944 #if defined (OBJECT_FORMAT_ELF)
7945 targetm.asm_out.named_section (sect->named.name,
7946 sect->named.common.flags
7951 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
7952 Therefore the following check is used.
7953 In case a the target is PE or COFF a comdat group section
7954 is created, e.g. .vtable_map_vars$foo. The linker places
7955 everything in .vtable_map_vars at the end.
7957 A fix could be made in
7958 gcc/config/i386/winnt.c: i386_pe_unique_section. */
7963 if (TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE)
7964 name = ACONCAT ((sect->named.name, "$",
7965 IDENTIFIER_POINTER (DECL_NAME (decl)), NULL));
7967 name = ACONCAT ((sect->named.name, "$",
7968 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl))),
7971 targetm.asm_out.named_section (name,
7972 sect->named.common.flags
7978 switch_to_section (sect);
7982 #include "gt-varasm.h"