1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2016 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"
37 #include "stringpool.h"
41 #include "diagnostic-core.h"
42 #include "fold-const.h"
43 #include "stor-layout.h"
50 #include "langhooks.h"
52 #include "common/common-target.h"
56 #ifdef XCOFF_DEBUGGING_INFO
57 #include "xcoffout.h" /* Needed for external data declarations. */
60 /* The (assembler) name of the first globally-visible object output. */
61 extern GTY(()) const char *first_global_object_name;
62 extern GTY(()) const char *weak_global_object_name;
64 const char *first_global_object_name;
65 const char *weak_global_object_name;
68 struct constant_descriptor_rtx;
69 struct rtx_constant_pool;
71 #define n_deferred_constants (crtl->varasm.deferred_constants)
73 /* Number for making the label on the next
74 constant that is stored in memory. */
76 static GTY(()) int const_labelno;
78 /* Carry information from ASM_DECLARE_OBJECT_NAME
79 to ASM_FINISH_DECLARE_OBJECT. */
81 int size_directive_output;
83 /* The last decl for which assemble_variable was called,
84 if it did ASM_DECLARE_OBJECT_NAME.
85 If the last call to assemble_variable didn't do that,
88 tree last_assemble_variable_decl;
90 /* The following global variable indicates if the first basic block
91 in a function belongs to the cold partition or not. */
93 bool first_function_block_is_cold;
95 /* Whether we saw any functions with no_split_stack. */
97 static bool saw_no_split_stack;
99 static const char *strip_reg_name (const char *);
100 static int contains_pointers_p (tree);
101 #ifdef ASM_OUTPUT_EXTERNAL
102 static bool incorporeal_function_p (tree);
104 static void decode_addr_const (tree, struct addr_const *);
105 static hashval_t const_hash_1 (const tree);
106 static int compare_constant (const tree, const tree);
107 static void output_constant_def_contents (rtx);
108 static void output_addressed_constants (tree);
109 static unsigned HOST_WIDE_INT output_constant (tree, unsigned HOST_WIDE_INT,
111 static void globalize_decl (tree);
112 static bool decl_readonly_section_1 (enum section_category);
113 #ifdef BSS_SECTION_ASM_OP
114 #ifdef ASM_OUTPUT_ALIGNED_BSS
115 static void asm_output_aligned_bss (FILE *, tree, const char *,
116 unsigned HOST_WIDE_INT, int)
119 #endif /* BSS_SECTION_ASM_OP */
120 static void mark_weak (tree);
121 static void output_constant_pool (const char *, tree);
122 static void handle_vtv_comdat_section (section *, const_tree);
124 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
125 section *text_section;
126 section *data_section;
127 section *readonly_data_section;
128 section *sdata_section;
129 section *ctors_section;
130 section *dtors_section;
131 section *bss_section;
132 section *sbss_section;
134 /* Various forms of common section. All are guaranteed to be nonnull. */
135 section *tls_comm_section;
136 section *comm_section;
137 section *lcomm_section;
139 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
141 section *bss_noswitch_section;
143 /* The section that holds the main exception table, when known. The section
144 is set either by the target's init_sections hook or by the first call to
145 switch_to_exception_section. */
146 section *exception_section;
148 /* The section that holds the DWARF2 frame unwind information, when known.
149 The section is set either by the target's init_sections hook or by the
150 first call to switch_to_eh_frame_section. */
151 section *eh_frame_section;
153 /* asm_out_file's current section. This is NULL if no section has yet
154 been selected or if we lose track of what the current section is. */
157 /* True if code for the current function is currently being directed
158 at the cold section. */
159 bool in_cold_section_p;
161 /* The following global holds the "function name" for the code in the
162 cold section of a function, if hot/cold function splitting is enabled
163 and there was actually code that went into the cold section. A
164 pseudo function name is needed for the cold section of code for some
165 debugging tools that perform symbolization. */
166 tree cold_function_name = NULL_TREE;
168 /* A linked list of all the unnamed sections. */
169 static GTY(()) section *unnamed_sections;
171 /* Return a nonzero value if DECL has a section attribute. */
172 #define IN_NAMED_SECTION(DECL) \
173 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
174 && DECL_SECTION_NAME (DECL) != NULL)
176 struct section_hasher : ggc_ptr_hash<section>
178 typedef const char *compare_type;
180 static hashval_t hash (section *);
181 static bool equal (section *, const char *);
184 /* Hash table of named sections. */
185 static GTY(()) hash_table<section_hasher> *section_htab;
187 struct object_block_hasher : ggc_ptr_hash<object_block>
189 typedef const section *compare_type;
191 static hashval_t hash (object_block *);
192 static bool equal (object_block *, const section *);
195 /* A table of object_blocks, indexed by section. */
196 static GTY(()) hash_table<object_block_hasher> *object_block_htab;
198 /* The next number to use for internal anchor labels. */
199 static GTY(()) int anchor_labelno;
201 /* A pool of constants that can be shared between functions. */
202 static GTY(()) struct rtx_constant_pool *shared_constant_pool;
204 /* Helper routines for maintaining section_htab. */
207 section_hasher::equal (section *old, const char *new_name)
209 return strcmp (old->named.name, new_name) == 0;
213 section_hasher::hash (section *old)
215 return htab_hash_string (old->named.name);
218 /* Return a hash value for section SECT. */
221 hash_section (section *sect)
223 if (sect->common.flags & SECTION_NAMED)
224 return htab_hash_string (sect->named.name);
225 return sect->common.flags;
228 /* Helper routines for maintaining object_block_htab. */
231 object_block_hasher::equal (object_block *old, const section *new_section)
233 return old->sect == new_section;
237 object_block_hasher::hash (object_block *old)
239 return hash_section (old->sect);
242 /* Return a new unnamed section with the given fields. */
245 get_unnamed_section (unsigned int flags, void (*callback) (const void *),
250 sect = ggc_alloc<section> ();
251 sect->unnamed.common.flags = flags | SECTION_UNNAMED;
252 sect->unnamed.callback = callback;
253 sect->unnamed.data = data;
254 sect->unnamed.next = unnamed_sections;
256 unnamed_sections = sect;
260 /* Return a SECTION_NOSWITCH section with the given fields. */
263 get_noswitch_section (unsigned int flags, noswitch_section_callback callback)
267 sect = ggc_alloc<section> ();
268 sect->noswitch.common.flags = flags | SECTION_NOSWITCH;
269 sect->noswitch.callback = callback;
274 /* Return the named section structure associated with NAME. Create
275 a new section with the given fields if no such structure exists. */
278 get_section (const char *name, unsigned int flags, tree decl)
280 section *sect, **slot;
282 slot = section_htab->find_slot_with_hash (name, htab_hash_string (name),
284 flags |= SECTION_NAMED;
287 sect = ggc_alloc<section> ();
288 sect->named.common.flags = flags;
289 sect->named.name = ggc_strdup (name);
290 sect->named.decl = decl;
296 if ((sect->common.flags & ~SECTION_DECLARED) != flags
297 && ((sect->common.flags | flags) & SECTION_OVERRIDE) == 0)
299 /* It is fine if one of the section flags is
300 SECTION_WRITE | SECTION_RELRO and the other has none of these
301 flags (i.e. read-only) in named sections and either the
302 section hasn't been declared yet or has been declared as writable.
303 In that case just make sure the resulting flags are
304 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
306 if (((sect->common.flags ^ flags) & (SECTION_WRITE | SECTION_RELRO))
307 == (SECTION_WRITE | SECTION_RELRO)
308 && (sect->common.flags
309 & ~(SECTION_DECLARED | SECTION_WRITE | SECTION_RELRO))
310 == (flags & ~(SECTION_WRITE | SECTION_RELRO))
311 && ((sect->common.flags & SECTION_DECLARED) == 0
312 || (sect->common.flags & SECTION_WRITE)))
314 sect->common.flags |= (SECTION_WRITE | SECTION_RELRO);
317 /* Sanity check user variables for flag changes. */
318 if (sect->named.decl != NULL
319 && DECL_P (sect->named.decl)
320 && decl != sect->named.decl)
322 if (decl != NULL && DECL_P (decl))
323 error ("%+D causes a section type conflict with %D",
324 decl, sect->named.decl);
326 error ("section type conflict with %D", sect->named.decl);
327 inform (DECL_SOURCE_LOCATION (sect->named.decl),
328 "%qD was declared here", sect->named.decl);
330 else if (decl != NULL && DECL_P (decl))
331 error ("%+D causes a section type conflict", decl);
333 error ("section type conflict");
334 /* Make sure we don't error about one section multiple times. */
335 sect->common.flags |= SECTION_OVERRIDE;
341 /* Return true if the current compilation mode benefits from having
342 objects grouped into blocks. */
345 use_object_blocks_p (void)
347 return flag_section_anchors;
350 /* Return the object_block structure for section SECT. Create a new
351 structure if we haven't created one already. Return null if SECT
354 static struct object_block *
355 get_block_for_section (section *sect)
357 struct object_block *block;
363 = object_block_htab->find_slot_with_hash (sect, hash_section (sect),
368 block = ggc_cleared_alloc<object_block> ();
375 /* Create a symbol with label LABEL and place it at byte offset
376 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
377 is not yet known. LABEL must be a garbage-collected string. */
380 create_block_symbol (const char *label, struct object_block *block,
381 HOST_WIDE_INT offset)
386 /* Create the extended SYMBOL_REF. */
387 size = RTX_HDR_SIZE + sizeof (struct block_symbol);
388 symbol = (rtx) ggc_internal_alloc (size);
390 /* Initialize the normal SYMBOL_REF fields. */
391 memset (symbol, 0, size);
392 PUT_CODE (symbol, SYMBOL_REF);
393 PUT_MODE (symbol, Pmode);
394 XSTR (symbol, 0) = label;
395 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_HAS_BLOCK_INFO;
397 /* Initialize the block_symbol stuff. */
398 SYMBOL_REF_BLOCK (symbol) = block;
399 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
404 /* Return a section with a particular name and with whatever SECTION_*
405 flags section_type_flags deems appropriate. The name of the section
406 is taken from NAME if nonnull, otherwise it is taken from DECL's
407 DECL_SECTION_NAME. DECL is the decl associated with the section
408 (see the section comment for details) and RELOC is as for
409 section_type_flags. */
412 get_named_section (tree decl, const char *name, int reloc)
418 gcc_assert (decl && DECL_P (decl) && DECL_SECTION_NAME (decl));
419 name = DECL_SECTION_NAME (decl);
422 flags = targetm.section_type_flags (decl, name, reloc);
423 return get_section (name, flags, decl);
426 /* Worker for resolve_unique_section. */
429 set_implicit_section (struct symtab_node *n, void *data ATTRIBUTE_UNUSED)
431 n->implicit_section = true;
435 /* If required, set DECL_SECTION_NAME to a unique name. */
438 resolve_unique_section (tree decl, int reloc ATTRIBUTE_UNUSED,
439 int flag_function_or_data_sections)
441 if (DECL_SECTION_NAME (decl) == NULL
442 && targetm_common.have_named_sections
443 && (flag_function_or_data_sections
444 || DECL_COMDAT_GROUP (decl)))
446 targetm.asm_out.unique_section (decl, reloc);
447 if (DECL_SECTION_NAME (decl))
448 symtab_node::get (decl)->call_for_symbol_and_aliases
449 (set_implicit_section, NULL, true);
453 #ifdef BSS_SECTION_ASM_OP
455 #ifdef ASM_OUTPUT_ALIGNED_BSS
457 /* Utility function for targets to use in implementing
458 ASM_OUTPUT_ALIGNED_BSS.
459 ??? It is believed that this function will work in most cases so such
460 support is localized here. */
463 asm_output_aligned_bss (FILE *file, tree decl ATTRIBUTE_UNUSED,
464 const char *name, unsigned HOST_WIDE_INT size,
467 switch_to_section (bss_section);
468 ASM_OUTPUT_ALIGN (file, floor_log2 (align / BITS_PER_UNIT));
469 #ifdef ASM_DECLARE_OBJECT_NAME
470 last_assemble_variable_decl = decl;
471 ASM_DECLARE_OBJECT_NAME (file, name, decl);
473 /* Standard thing is just output label for the object. */
474 ASM_OUTPUT_LABEL (file, name);
475 #endif /* ASM_DECLARE_OBJECT_NAME */
476 ASM_OUTPUT_SKIP (file, size ? size : 1);
481 #endif /* BSS_SECTION_ASM_OP */
483 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
484 /* Return the hot section for function DECL. Return text_section for
488 hot_function_section (tree decl)
490 if (decl != NULL_TREE
491 && DECL_SECTION_NAME (decl) != NULL
492 && targetm_common.have_named_sections)
493 return get_named_section (decl, NULL, 0);
499 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
502 When DECL_SECTION_NAME is non-NULL and it is implicit section and
503 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
504 concatenate the name with NAMED_SECTION_SUFFIX.
505 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
508 get_named_text_section (tree decl,
509 const char *text_section_name,
510 const char *named_section_suffix)
512 if (decl && DECL_SECTION_NAME (decl))
514 if (named_section_suffix)
516 const char *dsn = DECL_SECTION_NAME (decl);
517 const char *stripped_name;
520 name = (char *) alloca (strlen (dsn) + 1);
524 stripped_name = targetm.strip_name_encoding (name);
526 buffer = ACONCAT ((stripped_name, named_section_suffix, NULL));
527 return get_named_section (decl, buffer, 0);
529 else if (symtab_node::get (decl)->implicit_section)
533 /* Do not try to split gnu_linkonce functions. This gets somewhat
535 if (DECL_COMDAT_GROUP (decl) && !HAVE_COMDAT_GROUP)
537 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
538 name = targetm.strip_name_encoding (name);
539 return get_named_section (decl, ACONCAT ((text_section_name, ".",
545 return get_named_section (decl, text_section_name, 0);
548 /* Choose named function section based on its frequency. */
551 default_function_section (tree decl, enum node_frequency freq,
552 bool startup, bool exit)
554 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
555 /* Old GNU linkers have buggy --gc-section support, which sometimes
556 results in .gcc_except_table* sections being garbage collected. */
558 && symtab_node::get (decl)->implicit_section)
562 if (!flag_reorder_functions
563 || !targetm_common.have_named_sections)
565 /* Startup code should go to startup subsection unless it is
566 unlikely executed (this happens especially with function splitting
567 where we can split away unnecessary parts of static constructors. */
568 if (startup && freq != NODE_FREQUENCY_UNLIKELY_EXECUTED)
570 /* If we do have a profile or(and) LTO phase is executed, we do not need
571 these ELF section. */
572 if (!in_lto_p || !flag_profile_values)
573 return get_named_text_section (decl, ".text.startup", NULL);
578 /* Similarly for exit. */
579 if (exit && freq != NODE_FREQUENCY_UNLIKELY_EXECUTED)
580 return get_named_text_section (decl, ".text.exit", NULL);
582 /* Group cold functions together, similarly for hot code. */
585 case NODE_FREQUENCY_UNLIKELY_EXECUTED:
586 return get_named_text_section (decl, ".text.unlikely", NULL);
587 case NODE_FREQUENCY_HOT:
588 /* If we do have a profile or(and) LTO phase is executed, we do not need
589 these ELF section. */
590 if (!in_lto_p || !flag_profile_values)
591 return get_named_text_section (decl, ".text.hot", NULL);
598 /* Return the section for function DECL.
600 If DECL is NULL_TREE, return the text section. We can be passed
601 NULL_TREE under some circumstances by dbxout.c at least.
603 If FORCE_COLD is true, return cold function section ignoring
604 the frequency info of cgraph_node. */
607 function_section_1 (tree decl, bool force_cold)
609 section *section = NULL;
610 enum node_frequency freq = NODE_FREQUENCY_NORMAL;
611 bool startup = false, exit = false;
615 struct cgraph_node *node = cgraph_node::get (decl);
619 freq = node->frequency;
620 startup = node->only_called_at_startup;
621 exit = node->only_called_at_exit;
625 freq = NODE_FREQUENCY_UNLIKELY_EXECUTED;
627 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
628 if (decl != NULL_TREE
629 && DECL_SECTION_NAME (decl) != NULL)
631 if (targetm.asm_out.function_section)
632 section = targetm.asm_out.function_section (decl, freq,
636 return get_named_section (decl, NULL, 0);
639 return targetm.asm_out.select_section
640 (decl, freq == NODE_FREQUENCY_UNLIKELY_EXECUTED,
641 symtab_node::get (decl)->definition_alignment ());
643 if (targetm.asm_out.function_section)
644 section = targetm.asm_out.function_section (decl, freq, startup, exit);
647 return hot_function_section (decl);
651 /* Return the section for function DECL.
653 If DECL is NULL_TREE, return the text section. We can be passed
654 NULL_TREE under some circumstances by dbxout.c at least. */
657 function_section (tree decl)
659 /* Handle cases where function splitting code decides
660 to put function entry point into unlikely executed section
661 despite the fact that the function itself is not cold
662 (i.e. it is called rarely but contains a hot loop that is
663 better to live in hot subsection for the code locality). */
664 return function_section_1 (decl,
665 first_function_block_is_cold);
668 /* Return the section for the current function, take IN_COLD_SECTION_P
672 current_function_section (void)
674 return function_section_1 (current_function_decl, in_cold_section_p);
677 /* Tell assembler to switch to unlikely-to-be-executed text section. */
680 unlikely_text_section (void)
682 return function_section_1 (current_function_decl, true);
685 /* When called within a function context, return true if the function
686 has been assigned a cold text section and if SECT is that section.
687 When called outside a function context, return true if SECT is the
688 default cold section. */
691 unlikely_text_section_p (section *sect)
693 return sect == function_section_1 (current_function_decl, true);
696 /* Return the read-only data section associated with function DECL. */
699 default_function_rodata_section (tree decl)
701 if (decl != NULL_TREE && DECL_SECTION_NAME (decl))
703 const char *name = DECL_SECTION_NAME (decl);
705 if (DECL_COMDAT_GROUP (decl) && HAVE_COMDAT_GROUP)
711 dot = strchr (name + 1, '.');
714 len = strlen (dot) + 8;
715 rname = (char *) alloca (len);
717 strcpy (rname, ".rodata");
719 return get_section (rname, SECTION_LINKONCE, decl);
721 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
722 else if (DECL_COMDAT_GROUP (decl)
723 && strncmp (name, ".gnu.linkonce.t.", 16) == 0)
725 size_t len = strlen (name) + 1;
726 char *rname = (char *) alloca (len);
728 memcpy (rname, name, len);
730 return get_section (rname, SECTION_LINKONCE, decl);
732 /* For .text.foo we want to use .rodata.foo. */
733 else if (flag_function_sections && flag_data_sections
734 && strncmp (name, ".text.", 6) == 0)
736 size_t len = strlen (name) + 1;
737 char *rname = (char *) alloca (len + 2);
739 memcpy (rname, ".rodata", 7);
740 memcpy (rname + 7, name + 5, len - 5);
741 return get_section (rname, 0, decl);
745 return readonly_data_section;
748 /* Return the read-only data section associated with function DECL
749 for targets where that section should be always the single
750 readonly data section. */
753 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED)
755 return readonly_data_section;
758 /* A subroutine of mergeable_string_section and mergeable_constant_section. */
761 function_mergeable_rodata_prefix (void)
763 section *s = targetm.asm_out.function_rodata_section (current_function_decl);
764 if (SECTION_STYLE (s) == SECTION_NAMED)
765 return s->named.name;
767 return targetm.asm_out.mergeable_rodata_prefix;
770 /* Return the section to use for string merging. */
773 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
774 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
775 unsigned int flags ATTRIBUTE_UNUSED)
779 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
780 && TREE_CODE (decl) == STRING_CST
781 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
783 && (len = int_size_in_bytes (TREE_TYPE (decl))) > 0
784 && TREE_STRING_LENGTH (decl) >= len)
787 unsigned int modesize;
791 const char *prefix = function_mergeable_rodata_prefix ();
792 char *name = (char *) alloca (strlen (prefix) + 30);
794 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
795 modesize = GET_MODE_BITSIZE (mode);
796 if (modesize >= 8 && modesize <= 256
797 && (modesize & (modesize - 1)) == 0)
799 if (align < modesize)
802 str = TREE_STRING_POINTER (decl);
803 unit = GET_MODE_SIZE (mode);
805 /* Check for embedded NUL characters. */
806 for (i = 0; i < len; i += unit)
808 for (j = 0; j < unit; j++)
809 if (str[i + j] != '\0')
816 sprintf (name, "%s.str%d.%d", prefix,
817 modesize / 8, (int) (align / 8));
818 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
819 return get_section (name, flags, NULL);
824 return readonly_data_section;
827 /* Return the section to use for constant merging. */
830 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED,
831 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
832 unsigned int flags ATTRIBUTE_UNUSED)
834 unsigned int modesize = GET_MODE_BITSIZE (mode);
836 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
842 && (align & (align - 1)) == 0)
844 const char *prefix = function_mergeable_rodata_prefix ();
845 char *name = (char *) alloca (strlen (prefix) + 30);
847 sprintf (name, "%s.cst%d", prefix, (int) (align / 8));
848 flags |= (align / 8) | SECTION_MERGE;
849 return get_section (name, flags, NULL);
851 return readonly_data_section;
854 /* Given NAME, a putative register name, discard any customary prefixes. */
857 strip_reg_name (const char *name)
859 #ifdef REGISTER_PREFIX
860 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
861 name += strlen (REGISTER_PREFIX);
863 if (name[0] == '%' || name[0] == '#')
868 /* The user has asked for a DECL to have a particular name. Set (or
869 change) it in such a way that we don't prefix an underscore to
872 set_user_assembler_name (tree decl, const char *name)
874 char *starred = (char *) alloca (strlen (name) + 2);
876 strcpy (starred + 1, name);
877 symtab->change_decl_assembler_name (decl, get_identifier (starred));
878 SET_DECL_RTL (decl, NULL_RTX);
881 /* Decode an `asm' spec for a declaration as a register name.
882 Return the register number, or -1 if nothing specified,
883 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
884 or -3 if ASMSPEC is `cc' and is not recognized,
885 or -4 if ASMSPEC is `memory' and is not recognized.
886 Accept an exact spelling or a decimal number.
887 Prefixes such as % are optional. */
890 decode_reg_name_and_count (const char *asmspec, int *pnregs)
892 /* Presume just one register is clobbered. */
899 /* Get rid of confusing prefixes. */
900 asmspec = strip_reg_name (asmspec);
902 /* Allow a decimal number as a "register name". */
903 for (i = strlen (asmspec) - 1; i >= 0; i--)
904 if (! ISDIGIT (asmspec[i]))
906 if (asmspec[0] != 0 && i < 0)
909 if (i < FIRST_PSEUDO_REGISTER && i >= 0 && reg_names[i][0])
915 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
917 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
920 #ifdef OVERLAPPING_REGISTER_NAMES
924 const char *const name;
927 } table[] = OVERLAPPING_REGISTER_NAMES;
929 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
931 && ! strcmp (asmspec, table[i].name))
933 *pnregs = table[i].nregs;
934 return table[i].number;
937 #endif /* OVERLAPPING_REGISTER_NAMES */
939 #ifdef ADDITIONAL_REGISTER_NAMES
941 static const struct { const char *const name; const int number; } table[]
942 = ADDITIONAL_REGISTER_NAMES;
944 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
946 && ! strcmp (asmspec, table[i].name)
947 && reg_names[table[i].number][0])
948 return table[i].number;
950 #endif /* ADDITIONAL_REGISTER_NAMES */
952 if (!strcmp (asmspec, "memory"))
955 if (!strcmp (asmspec, "cc"))
965 decode_reg_name (const char *name)
968 return decode_reg_name_and_count (name, &count);
972 /* Return true if DECL's initializer is suitable for a BSS section. */
975 bss_initializer_p (const_tree decl)
977 return (DECL_INITIAL (decl) == NULL
978 /* In LTO we have no errors in program; error_mark_node is used
979 to mark offlined constructors. */
980 || (DECL_INITIAL (decl) == error_mark_node
982 || (flag_zero_initialized_in_bss
983 /* Leave constant zeroes in .rodata so they
985 && !TREE_READONLY (decl)
986 && initializer_zerop (DECL_INITIAL (decl))));
989 /* Compute the alignment of variable specified by DECL.
990 DONT_OUTPUT_DATA is from assemble_variable. */
993 align_variable (tree decl, bool dont_output_data)
995 unsigned int align = DECL_ALIGN (decl);
997 /* In the case for initialing an array whose length isn't specified,
998 where we have not yet been able to do the layout,
999 figure out the proper alignment now. */
1000 if (dont_output_data && DECL_SIZE (decl) == 0
1001 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1002 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
1004 /* Some object file formats have a maximum alignment which they support.
1005 In particular, a.out format supports a maximum alignment of 4. */
1006 if (align > MAX_OFILE_ALIGNMENT)
1008 error ("alignment of %q+D is greater than maximum object "
1009 "file alignment %d", decl,
1010 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
1011 align = MAX_OFILE_ALIGNMENT;
1014 if (! DECL_USER_ALIGN (decl))
1016 #ifdef DATA_ABI_ALIGNMENT
1017 unsigned int data_abi_align
1018 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl), align);
1019 /* For backwards compatibility, don't assume the ABI alignment for
1021 if (! DECL_THREAD_LOCAL_P (decl) || data_abi_align <= BITS_PER_WORD)
1022 align = data_abi_align;
1025 /* On some machines, it is good to increase alignment sometimes.
1026 But as DECL_ALIGN is used both for actually emitting the variable
1027 and for code accessing the variable as guaranteed alignment, we
1028 can only increase the alignment if it is a performance optimization
1029 if the references to it must bind to the current definition. */
1030 if (decl_binds_to_current_def_p (decl)
1031 && !DECL_VIRTUAL_P (decl))
1033 #ifdef DATA_ALIGNMENT
1034 unsigned int data_align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1035 /* Don't increase alignment too much for TLS variables - TLS space
1037 if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
1040 if (DECL_INITIAL (decl) != 0
1041 /* In LTO we have no errors in program; error_mark_node is used
1042 to mark offlined constructors. */
1043 && (in_lto_p || DECL_INITIAL (decl) != error_mark_node))
1045 unsigned int const_align
1046 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align);
1047 /* Don't increase alignment too much for TLS variables - TLS
1048 space is too precious. */
1049 if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
1050 align = const_align;
1055 /* Reset the alignment in case we have made it tighter, so we can benefit
1056 from it in get_pointer_alignment. */
1057 SET_DECL_ALIGN (decl, align);
1060 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1061 beyond what align_variable returned. */
1064 get_variable_align (tree decl)
1066 unsigned int align = DECL_ALIGN (decl);
1068 /* For user aligned vars or static vars align_variable already did
1070 if (DECL_USER_ALIGN (decl) || !TREE_PUBLIC (decl))
1073 #ifdef DATA_ABI_ALIGNMENT
1074 if (DECL_THREAD_LOCAL_P (decl))
1075 align = DATA_ABI_ALIGNMENT (TREE_TYPE (decl), align);
1078 /* For decls that bind to the current definition, align_variable
1079 did also everything, except for not assuming ABI required alignment
1080 of TLS variables. For other vars, increase the alignment here
1081 as an optimization. */
1082 if (!decl_binds_to_current_def_p (decl))
1084 /* On some machines, it is good to increase alignment sometimes. */
1085 #ifdef DATA_ALIGNMENT
1086 unsigned int data_align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1087 /* Don't increase alignment too much for TLS variables - TLS space
1089 if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
1092 if (DECL_INITIAL (decl) != 0
1093 /* In LTO we have no errors in program; error_mark_node is used
1094 to mark offlined constructors. */
1095 && (in_lto_p || DECL_INITIAL (decl) != error_mark_node))
1097 unsigned int const_align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl),
1099 /* Don't increase alignment too much for TLS variables - TLS space
1101 if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
1102 align = const_align;
1109 /* Return the section into which the given VAR_DECL or CONST_DECL
1110 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1111 section should be used wherever possible. */
1114 get_variable_section (tree decl, bool prefer_noswitch_p)
1116 addr_space_t as = ADDR_SPACE_GENERIC;
1118 varpool_node *vnode = varpool_node::get (decl);
1121 vnode = vnode->ultimate_alias_target ();
1125 if (TREE_TYPE (decl) != error_mark_node)
1126 as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
1128 /* We need the constructor to figure out reloc flag. */
1130 vnode->get_constructor ();
1132 if (DECL_COMMON (decl))
1134 /* If the decl has been given an explicit section name, or it resides
1135 in a non-generic address space, then it isn't common, and shouldn't
1136 be handled as such. */
1137 gcc_assert (DECL_SECTION_NAME (decl) == NULL
1138 && ADDR_SPACE_GENERIC_P (as));
1139 if (DECL_THREAD_LOCAL_P (decl))
1140 return tls_comm_section;
1141 else if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
1142 return comm_section;
1145 if (DECL_INITIAL (decl) == error_mark_node)
1146 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
1147 else if (DECL_INITIAL (decl))
1148 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
1152 resolve_unique_section (decl, reloc, flag_data_sections);
1153 if (IN_NAMED_SECTION (decl))
1154 return get_named_section (decl, NULL, reloc);
1156 if (ADDR_SPACE_GENERIC_P (as)
1157 && !DECL_THREAD_LOCAL_P (decl)
1158 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
1159 && bss_initializer_p (decl))
1161 if (!TREE_PUBLIC (decl)
1162 && !((flag_sanitize & SANITIZE_ADDRESS)
1163 && asan_protect_global (decl)))
1164 return lcomm_section;
1165 if (bss_noswitch_section)
1166 return bss_noswitch_section;
1169 return targetm.asm_out.select_section (decl, reloc,
1170 get_variable_align (decl));
1173 /* Return the block into which object_block DECL should be placed. */
1175 static struct object_block *
1176 get_block_for_decl (tree decl)
1180 if (TREE_CODE (decl) == VAR_DECL)
1182 /* The object must be defined in this translation unit. */
1183 if (DECL_EXTERNAL (decl))
1186 /* There's no point using object blocks for something that is
1187 isolated by definition. */
1188 if (DECL_COMDAT_GROUP (decl))
1192 /* We can only calculate block offsets if the decl has a known
1194 if (DECL_SIZE_UNIT (decl) == NULL)
1196 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl)))
1199 /* Find out which section should contain DECL. We cannot put it into
1200 an object block if it requires a standalone definition. */
1201 if (TREE_CODE (decl) == VAR_DECL)
1202 align_variable (decl, 0);
1203 sect = get_variable_section (decl, true);
1204 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1207 return get_block_for_section (sect);
1210 /* Make sure block symbol SYMBOL is in block BLOCK. */
1213 change_symbol_block (rtx symbol, struct object_block *block)
1215 if (block != SYMBOL_REF_BLOCK (symbol))
1217 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
1218 SYMBOL_REF_BLOCK (symbol) = block;
1222 /* Return true if it is possible to put DECL in an object_block. */
1225 use_blocks_for_decl_p (tree decl)
1227 struct symtab_node *snode;
1229 /* Only data DECLs can be placed into object blocks. */
1230 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
1233 /* Detect decls created by dw2_force_const_mem. Such decls are
1234 special because DECL_INITIAL doesn't specify the decl's true value.
1235 dw2_output_indirect_constants will instead call assemble_variable
1236 with dont_output_data set to 1 and then print the contents itself. */
1237 if (DECL_INITIAL (decl) == decl)
1240 /* If this decl is an alias, then we don't want to emit a
1242 if (TREE_CODE (decl) == VAR_DECL
1243 && (snode = symtab_node::get (decl)) != NULL
1247 return targetm.use_blocks_for_decl_p (decl);
1250 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1251 until we find an identifier that is not itself a transparent alias.
1252 Modify the alias passed to it by reference (and all aliases on the
1253 way to the ultimate target), such that they do not have to be
1254 followed again, and return the ultimate target of the alias
1258 ultimate_transparent_alias_target (tree *alias)
1260 tree target = *alias;
1262 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
1264 gcc_assert (TREE_CHAIN (target));
1265 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
1266 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
1267 && ! TREE_CHAIN (target));
1274 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1275 have static storage duration. In other words, it should not be an
1276 automatic variable, including PARM_DECLs.
1278 There is, however, one exception: this function handles variables
1279 explicitly placed in a particular register by the user.
1281 This is never called for PARM_DECL nodes. */
1284 make_decl_rtl (tree decl)
1286 const char *name = 0;
1291 /* Check that we are not being given an automatic variable. */
1292 gcc_assert (TREE_CODE (decl) != PARM_DECL
1293 && TREE_CODE (decl) != RESULT_DECL);
1295 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1296 gcc_assert (TREE_CODE (decl) != VAR_DECL
1297 || TREE_STATIC (decl)
1298 || TREE_PUBLIC (decl)
1299 || DECL_EXTERNAL (decl)
1300 || DECL_REGISTER (decl));
1302 /* And that we were not given a type or a label. */
1303 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1304 && TREE_CODE (decl) != LABEL_DECL);
1306 /* For a duplicate declaration, we can be called twice on the
1307 same DECL node. Don't discard the RTL already made. */
1308 if (DECL_RTL_SET_P (decl))
1310 /* If the old RTL had the wrong mode, fix the mode. */
1311 x = DECL_RTL (decl);
1312 if (GET_MODE (x) != DECL_MODE (decl))
1313 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1315 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1318 /* ??? Another way to do this would be to maintain a hashed
1319 table of such critters. Instead of adding stuff to a DECL
1320 to give certain attributes to it, we could use an external
1321 hash map from DECL to set of attributes. */
1323 /* Let the target reassign the RTL if it wants.
1324 This is necessary, for example, when one machine specific
1325 decl attribute overrides another. */
1326 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1328 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1329 on the new decl information. */
1331 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1332 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1333 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1338 /* If this variable belongs to the global constant pool, retrieve the
1339 pre-computed RTL or recompute it in LTO mode. */
1340 if (TREE_CODE (decl) == VAR_DECL && DECL_IN_CONSTANT_POOL (decl))
1342 SET_DECL_RTL (decl, output_constant_def (DECL_INITIAL (decl), 1));
1346 id = DECL_ASSEMBLER_NAME (decl);
1347 if (TREE_CODE (decl) == FUNCTION_DECL
1348 && cgraph_node::get (decl)
1349 && cgraph_node::get (decl)->instrumentation_clone)
1350 ultimate_transparent_alias_target (&id);
1351 name = IDENTIFIER_POINTER (id);
1353 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1354 && DECL_REGISTER (decl))
1356 error ("register name not specified for %q+D", decl);
1358 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1360 const char *asmspec = name+1;
1361 machine_mode mode = DECL_MODE (decl);
1362 reg_number = decode_reg_name (asmspec);
1363 /* First detect errors in declaring global registers. */
1364 if (reg_number == -1)
1365 error ("register name not specified for %q+D", decl);
1366 else if (reg_number < 0)
1367 error ("invalid register name for %q+D", decl);
1368 else if (mode == BLKmode)
1369 error ("data type of %q+D isn%'t suitable for a register",
1371 else if (!in_hard_reg_set_p (accessible_reg_set, mode, reg_number))
1372 error ("the register specified for %q+D cannot be accessed"
1373 " by the current target", decl);
1374 else if (!in_hard_reg_set_p (operand_reg_set, mode, reg_number))
1375 error ("the register specified for %q+D is not general enough"
1376 " to be used as a register variable", decl);
1377 else if (!HARD_REGNO_MODE_OK (reg_number, mode))
1378 error ("register specified for %q+D isn%'t suitable for data type",
1380 /* Now handle properly declared static register variables. */
1385 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1387 DECL_INITIAL (decl) = 0;
1388 error ("global register variable has initial value");
1390 if (TREE_THIS_VOLATILE (decl))
1391 warning (OPT_Wvolatile_register_var,
1392 "optimization may eliminate reads and/or "
1393 "writes to register variables");
1395 /* If the user specified one of the eliminables registers here,
1396 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1397 confused with that register and be eliminated. This usage is
1398 somewhat suspect... */
1400 SET_DECL_RTL (decl, gen_raw_REG (mode, reg_number));
1401 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1402 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1404 if (TREE_STATIC (decl))
1406 /* Make this register global, so not usable for anything
1408 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1409 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1410 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1412 nregs = hard_regno_nregs[reg_number][mode];
1414 globalize_reg (decl, reg_number + --nregs);
1417 /* As a register variable, it has no section. */
1420 /* Avoid internal errors from invalid register
1422 SET_DECL_ASSEMBLER_NAME (decl, NULL_TREE);
1423 DECL_HARD_REGISTER (decl) = 0;
1424 /* Also avoid SSA inconsistencies by pretending this is an external
1426 DECL_EXTERNAL (decl) = 1;
1429 /* Now handle ordinary static variables and functions (in memory).
1430 Also handle vars declared register invalidly. */
1431 else if (name[0] == '*')
1433 #ifdef REGISTER_PREFIX
1434 if (strlen (REGISTER_PREFIX) != 0)
1436 reg_number = decode_reg_name (name);
1437 if (reg_number >= 0 || reg_number == -3)
1438 error ("register name given for non-register variable %q+D", decl);
1443 /* Specifying a section attribute on a variable forces it into a
1444 non-.bss section, and thus it cannot be common. */
1445 /* FIXME: In general this code should not be necessary because
1446 visibility pass is doing the same work. But notice_global_symbol
1447 is called early and it needs to make DECL_RTL to get the name.
1448 we take care of recomputing the DECL_RTL after visibility is changed. */
1449 if (TREE_CODE (decl) == VAR_DECL
1450 && (TREE_STATIC (decl) || DECL_EXTERNAL (decl))
1451 && DECL_SECTION_NAME (decl) != NULL
1452 && DECL_INITIAL (decl) == NULL_TREE
1453 && DECL_COMMON (decl))
1454 DECL_COMMON (decl) = 0;
1456 /* Variables can't be both common and weak. */
1457 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1458 DECL_COMMON (decl) = 0;
1460 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1461 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1464 machine_mode address_mode = Pmode;
1465 if (TREE_TYPE (decl) != error_mark_node)
1467 addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
1468 address_mode = targetm.addr_space.address_mode (as);
1470 x = gen_rtx_SYMBOL_REF (address_mode, name);
1472 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1473 SET_SYMBOL_REF_DECL (x, decl);
1475 x = gen_rtx_MEM (DECL_MODE (decl), x);
1476 if (TREE_CODE (decl) != FUNCTION_DECL)
1477 set_mem_attributes (x, decl, 1);
1478 SET_DECL_RTL (decl, x);
1480 /* Optionally set flags or add text to the name to record information
1481 such as that it is a function name.
1482 If the name is changed, the macro ASM_OUTPUT_LABELREF
1483 will have to know how to strip this information. */
1484 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1487 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1488 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1492 make_decl_rtl_for_debug (tree decl)
1494 unsigned int save_aliasing_flag;
1497 if (DECL_RTL_SET_P (decl))
1498 return DECL_RTL (decl);
1500 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1501 call new_alias_set. If running with -fcompare-debug, sometimes
1502 we do not want to create alias sets that will throw the alias
1503 numbers off in the comparison dumps. So... clearing
1504 flag_strict_aliasing will keep new_alias_set() from creating a
1506 save_aliasing_flag = flag_strict_aliasing;
1507 flag_strict_aliasing = 0;
1509 rtl = DECL_RTL (decl);
1510 /* Reset DECL_RTL back, as various parts of the compiler expects
1511 DECL_RTL set meaning it is actually going to be output. */
1512 SET_DECL_RTL (decl, NULL);
1514 flag_strict_aliasing = save_aliasing_flag;
1518 /* Output a string of literal assembler code
1519 for an `asm' keyword used between functions. */
1522 assemble_asm (tree string)
1527 if (TREE_CODE (string) == ADDR_EXPR)
1528 string = TREE_OPERAND (string, 0);
1530 p = TREE_STRING_POINTER (string);
1531 fprintf (asm_out_file, "%s%s\n", p[0] == '\t' ? "" : "\t", p);
1534 /* Write the address of the entity given by SYMBOL to SEC. */
1536 assemble_addr_to_section (rtx symbol, section *sec)
1538 switch_to_section (sec);
1539 assemble_align (POINTER_SIZE);
1540 assemble_integer (symbol, POINTER_SIZE_UNITS, POINTER_SIZE, 1);
1543 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1544 not) section for PRIORITY. */
1546 get_cdtor_priority_section (int priority, bool constructor_p)
1550 /* ??? This only works reliably with the GNU linker. */
1551 sprintf (buf, "%s.%.5u",
1552 constructor_p ? ".ctors" : ".dtors",
1553 /* Invert the numbering so the linker puts us in the proper
1554 order; constructors are run from right to left, and the
1555 linker sorts in increasing order. */
1556 MAX_INIT_PRIORITY - priority);
1557 return get_section (buf, SECTION_WRITE, NULL);
1561 default_named_section_asm_out_destructor (rtx symbol, int priority)
1565 if (priority != DEFAULT_INIT_PRIORITY)
1566 sec = get_cdtor_priority_section (priority,
1567 /*constructor_p=*/false);
1569 sec = get_section (".dtors", SECTION_WRITE, NULL);
1571 assemble_addr_to_section (symbol, sec);
1574 #ifdef DTORS_SECTION_ASM_OP
1576 default_dtor_section_asm_out_destructor (rtx symbol,
1577 int priority ATTRIBUTE_UNUSED)
1579 assemble_addr_to_section (symbol, dtors_section);
1584 default_named_section_asm_out_constructor (rtx symbol, int priority)
1588 if (priority != DEFAULT_INIT_PRIORITY)
1589 sec = get_cdtor_priority_section (priority,
1590 /*constructor_p=*/true);
1592 sec = get_section (".ctors", SECTION_WRITE, NULL);
1594 assemble_addr_to_section (symbol, sec);
1597 #ifdef CTORS_SECTION_ASM_OP
1599 default_ctor_section_asm_out_constructor (rtx symbol,
1600 int priority ATTRIBUTE_UNUSED)
1602 assemble_addr_to_section (symbol, ctors_section);
1606 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1607 a nonzero value if the constant pool should be output before the
1608 start of the function, or a zero value if the pool should output
1609 after the end of the function. The default is to put it before the
1612 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1613 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1616 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1617 to be output to assembler.
1618 Set first_global_object_name and weak_global_object_name as appropriate. */
1621 notice_global_symbol (tree decl)
1623 const char **t = &first_global_object_name;
1625 if (first_global_object_name
1626 || !TREE_PUBLIC (decl)
1627 || DECL_EXTERNAL (decl)
1628 || !DECL_NAME (decl)
1629 || (TREE_CODE (decl) == VAR_DECL && DECL_HARD_REGISTER (decl))
1630 || (TREE_CODE (decl) != FUNCTION_DECL
1631 && (TREE_CODE (decl) != VAR_DECL
1632 || (DECL_COMMON (decl)
1633 && (DECL_INITIAL (decl) == 0
1634 || DECL_INITIAL (decl) == error_mark_node)))))
1637 /* We win when global object is found, but it is useful to know about weak
1638 symbol as well so we can produce nicer unique names. */
1639 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl) || flag_shlib)
1640 t = &weak_global_object_name;
1644 tree id = DECL_ASSEMBLER_NAME (decl);
1645 ultimate_transparent_alias_target (&id);
1646 *t = ggc_strdup (targetm.strip_name_encoding (IDENTIFIER_POINTER (id)));
1650 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1651 current function goes into the cold section, so that targets can use
1652 current_function_section during RTL expansion. DECL describes the
1656 decide_function_section (tree decl)
1658 first_function_block_is_cold = false;
1660 if (flag_reorder_blocks_and_partition)
1661 /* We will decide in assemble_start_function. */
1664 if (DECL_SECTION_NAME (decl))
1666 struct cgraph_node *node = cgraph_node::get (current_function_decl);
1667 /* Calls to function_section rely on first_function_block_is_cold
1669 first_function_block_is_cold = (node
1671 == NODE_FREQUENCY_UNLIKELY_EXECUTED);
1674 in_cold_section_p = first_function_block_is_cold;
1677 /* Get the function's name, as described by its RTL. This may be
1678 different from the DECL_NAME name used in the source file. */
1680 get_fnname_from_decl (tree decl)
1682 rtx x = DECL_RTL (decl);
1683 gcc_assert (MEM_P (x));
1685 gcc_assert (GET_CODE (x) == SYMBOL_REF);
1689 /* Output assembler code for the constant pool of a function and associated
1690 with defining the name of the function. DECL describes the function.
1691 NAME is the function's name. For the constant pool, we use the current
1692 constant pool data. */
1695 assemble_start_function (tree decl, const char *fnname)
1698 char tmp_label[100];
1699 bool hot_label_written = false;
1701 if (flag_reorder_blocks_and_partition)
1703 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1704 crtl->subsections.hot_section_label = ggc_strdup (tmp_label);
1705 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1706 crtl->subsections.cold_section_label = ggc_strdup (tmp_label);
1707 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1708 crtl->subsections.hot_section_end_label = ggc_strdup (tmp_label);
1709 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1710 crtl->subsections.cold_section_end_label = ggc_strdup (tmp_label);
1712 cold_function_name = NULL_TREE;
1716 crtl->subsections.hot_section_label = NULL;
1717 crtl->subsections.cold_section_label = NULL;
1718 crtl->subsections.hot_section_end_label = NULL;
1719 crtl->subsections.cold_section_end_label = NULL;
1722 /* The following code does not need preprocessing in the assembler. */
1726 if (CONSTANT_POOL_BEFORE_FUNCTION)
1727 output_constant_pool (fnname, decl);
1729 align = symtab_node::get (decl)->definition_alignment ();
1731 /* Make sure the not and cold text (code) sections are properly
1732 aligned. This is necessary here in the case where the function
1733 has both hot and cold sections, because we don't want to re-set
1734 the alignment when the section switch happens mid-function. */
1736 if (flag_reorder_blocks_and_partition)
1738 first_function_block_is_cold = false;
1740 switch_to_section (unlikely_text_section ());
1741 assemble_align (align);
1742 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_label);
1744 /* When the function starts with a cold section, we need to explicitly
1745 align the hot section and write out the hot section label.
1746 But if the current function is a thunk, we do not have a CFG. */
1748 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun)->next_bb) == BB_COLD_PARTITION)
1750 switch_to_section (text_section);
1751 assemble_align (align);
1752 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1753 hot_label_written = true;
1754 first_function_block_is_cold = true;
1756 in_cold_section_p = first_function_block_is_cold;
1760 /* Switch to the correct text section for the start of the function. */
1762 switch_to_section (function_section (decl));
1763 if (flag_reorder_blocks_and_partition
1764 && !hot_label_written)
1765 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1767 /* Tell assembler to move to target machine's alignment for functions. */
1768 align = floor_log2 (align / BITS_PER_UNIT);
1771 ASM_OUTPUT_ALIGN (asm_out_file, align);
1774 /* Handle a user-specified function alignment.
1775 Note that we still need to align to DECL_ALIGN, as above,
1776 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1777 if (! DECL_USER_ALIGN (decl)
1778 && align_functions_log > align
1779 && optimize_function_for_speed_p (cfun))
1781 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1782 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1783 align_functions_log, align_functions - 1);
1785 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1789 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1790 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1793 if (!DECL_IGNORED_P (decl))
1794 (*debug_hooks->begin_function) (decl);
1796 /* Make function name accessible from other files, if appropriate. */
1798 if (TREE_PUBLIC (decl)
1799 || (cgraph_node::get (decl)->instrumentation_clone
1800 && cgraph_node::get (decl)->instrumented_version
1801 && TREE_PUBLIC (cgraph_node::get (decl)->instrumented_version->decl)))
1803 notice_global_symbol (decl);
1805 globalize_decl (decl);
1807 maybe_assemble_visibility (decl);
1810 if (DECL_PRESERVE_P (decl))
1811 targetm.asm_out.mark_decl_preserved (fnname);
1813 /* Do any machine/system dependent processing of the function name. */
1814 #ifdef ASM_DECLARE_FUNCTION_NAME
1815 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1817 /* Standard thing is just output label for the function. */
1818 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file, fnname, current_function_decl);
1819 #endif /* ASM_DECLARE_FUNCTION_NAME */
1821 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl)))
1822 saw_no_split_stack = true;
1825 /* Output assembler code associated with defining the size of the
1826 function. DECL describes the function. NAME is the function's name. */
1829 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1831 #ifdef ASM_DECLARE_FUNCTION_SIZE
1832 /* We could have switched section in the middle of the function. */
1833 if (flag_reorder_blocks_and_partition)
1834 switch_to_section (function_section (decl));
1835 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1837 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1839 output_constant_pool (fnname, decl);
1840 switch_to_section (function_section (decl)); /* need to switch back */
1842 /* Output labels for end of hot/cold text sections (to be used by
1844 if (flag_reorder_blocks_and_partition)
1846 section *save_text_section;
1848 save_text_section = in_section;
1849 switch_to_section (unlikely_text_section ());
1850 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
1851 if (cold_function_name != NULL_TREE)
1852 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file,
1853 IDENTIFIER_POINTER (cold_function_name),
1856 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_end_label);
1857 if (first_function_block_is_cold)
1858 switch_to_section (text_section);
1860 switch_to_section (function_section (decl));
1861 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_end_label);
1862 switch_to_section (save_text_section);
1866 /* Assemble code to leave SIZE bytes of zeros. */
1869 assemble_zeros (unsigned HOST_WIDE_INT size)
1871 /* Do no output if -fsyntax-only. */
1872 if (flag_syntax_only)
1875 #ifdef ASM_NO_SKIP_IN_TEXT
1876 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1877 so we must output 0s explicitly in the text section. */
1878 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1880 unsigned HOST_WIDE_INT i;
1881 for (i = 0; i < size; i++)
1882 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1887 ASM_OUTPUT_SKIP (asm_out_file, size);
1890 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1893 assemble_align (int align)
1895 if (align > BITS_PER_UNIT)
1897 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1901 /* Assemble a string constant with the specified C string as contents. */
1904 assemble_string (const char *p, int size)
1909 /* If the string is very long, split it up. */
1913 int thissize = size - pos;
1914 if (thissize > maximum)
1917 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1925 /* A noswitch_section_callback for lcomm_section. */
1928 emit_local (tree decl ATTRIBUTE_UNUSED,
1929 const char *name ATTRIBUTE_UNUSED,
1930 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1931 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1933 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1934 unsigned int align = symtab_node::get (decl)->definition_alignment ();
1935 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1938 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1939 unsigned int align = symtab_node::get (decl)->definition_alignment ();
1940 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, align);
1943 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1948 /* A noswitch_section_callback for bss_noswitch_section. */
1950 #if defined ASM_OUTPUT_ALIGNED_BSS
1952 emit_bss (tree decl ATTRIBUTE_UNUSED,
1953 const char *name ATTRIBUTE_UNUSED,
1954 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1955 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1957 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size,
1958 get_variable_align (decl));
1963 /* A noswitch_section_callback for comm_section. */
1966 emit_common (tree decl ATTRIBUTE_UNUSED,
1967 const char *name ATTRIBUTE_UNUSED,
1968 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1969 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1971 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1972 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1973 size, get_variable_align (decl));
1975 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1976 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size,
1977 get_variable_align (decl));
1980 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1985 /* A noswitch_section_callback for tls_comm_section. */
1988 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1989 const char *name ATTRIBUTE_UNUSED,
1990 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1991 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1993 #ifdef ASM_OUTPUT_TLS_COMMON
1994 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1997 sorry ("thread-local COMMON data not implemented");
2002 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2003 NAME is the name of DECL's SYMBOL_REF. */
2006 assemble_noswitch_variable (tree decl, const char *name, section *sect,
2009 unsigned HOST_WIDE_INT size, rounded;
2011 size = tree_to_uhwi (DECL_SIZE_UNIT (decl));
2014 if ((flag_sanitize & SANITIZE_ADDRESS) && asan_protect_global (decl))
2015 size += asan_red_zone_size (size);
2017 /* Don't allocate zero bytes of common,
2018 since that means "undefined external" in the linker. */
2022 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2023 so that each uninitialized object starts on such a boundary. */
2024 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
2025 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2026 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2028 if (!sect->noswitch.callback (decl, name, size, rounded)
2029 && (unsigned HOST_WIDE_INT) (align / BITS_PER_UNIT) > rounded)
2030 error ("requested alignment for %q+D is greater than "
2031 "implemented alignment of %wu", decl, rounded);
2034 /* A subroutine of assemble_variable. Output the label and contents of
2035 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2036 is as for assemble_variable. */
2039 assemble_variable_contents (tree decl, const char *name,
2040 bool dont_output_data)
2042 /* Do any machine/system dependent processing of the object. */
2043 #ifdef ASM_DECLARE_OBJECT_NAME
2044 last_assemble_variable_decl = decl;
2045 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
2047 /* Standard thing is just output label for the object. */
2048 ASM_OUTPUT_LABEL (asm_out_file, name);
2049 #endif /* ASM_DECLARE_OBJECT_NAME */
2051 if (!dont_output_data)
2053 /* Caller is supposed to use varpool_get_constructor when it wants
2054 to output the body. */
2055 gcc_assert (!in_lto_p || DECL_INITIAL (decl) != error_mark_node);
2056 if (DECL_INITIAL (decl)
2057 && DECL_INITIAL (decl) != error_mark_node
2058 && !initializer_zerop (DECL_INITIAL (decl)))
2059 /* Output the actual data. */
2060 output_constant (DECL_INITIAL (decl),
2061 tree_to_uhwi (DECL_SIZE_UNIT (decl)),
2062 get_variable_align (decl),
2065 /* Leave space for it. */
2066 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl)));
2067 targetm.asm_out.decl_end ();
2071 /* Write out assembly for the variable DECL, which is not defined in
2072 the current translation unit. */
2074 assemble_undefined_decl (tree decl)
2076 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
2077 targetm.asm_out.assemble_undefined_decl (asm_out_file, name, decl);
2080 /* Assemble everything that is needed for a variable or function declaration.
2081 Not used for automatic variables, and not used for function definitions.
2082 Should not be called for variables of incomplete structure type.
2084 TOP_LEVEL is nonzero if this variable has file scope.
2085 AT_END is nonzero if this is the special handling, at end of compilation,
2086 to define things that have had only tentative definitions.
2087 DONT_OUTPUT_DATA if nonzero means don't actually output the
2088 initial value (that will be done by the caller). */
2091 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
2092 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
2095 rtx decl_rtl, symbol;
2098 bool asan_protected = false;
2100 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2101 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2103 /* Emulated TLS had better not get this far. */
2104 gcc_checking_assert (targetm.have_tls || !DECL_THREAD_LOCAL_P (decl));
2106 last_assemble_variable_decl = 0;
2108 /* Normally no need to say anything here for external references,
2109 since assemble_external is called by the language-specific code
2110 when a declaration is first seen. */
2112 if (DECL_EXTERNAL (decl))
2115 /* Do nothing for global register variables. */
2116 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
2118 TREE_ASM_WRITTEN (decl) = 1;
2122 /* If type was incomplete when the variable was declared,
2123 see if it is complete now. */
2125 if (DECL_SIZE (decl) == 0)
2126 layout_decl (decl, 0);
2128 /* Still incomplete => don't allocate it; treat the tentative defn
2129 (which is what it must have been) as an `extern' reference. */
2131 if (!dont_output_data && DECL_SIZE (decl) == 0)
2133 error ("storage size of %q+D isn%'t known", decl);
2134 TREE_ASM_WRITTEN (decl) = 1;
2138 /* The first declaration of a variable that comes through this function
2139 decides whether it is global (in C, has external linkage)
2140 or local (in C, has internal linkage). So do nothing more
2141 if this function has already run. */
2143 if (TREE_ASM_WRITTEN (decl))
2146 /* Make sure targetm.encode_section_info is invoked before we set
2148 decl_rtl = DECL_RTL (decl);
2150 TREE_ASM_WRITTEN (decl) = 1;
2152 /* Do no output if -fsyntax-only. */
2153 if (flag_syntax_only)
2156 if (! dont_output_data
2157 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl)))
2159 error ("size of variable %q+D is too large", decl);
2163 gcc_assert (MEM_P (decl_rtl));
2164 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
2165 symbol = XEXP (decl_rtl, 0);
2167 /* If this symbol belongs to the tree constant pool, output the constant
2168 if it hasn't already been written. */
2169 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
2171 tree decl = SYMBOL_REF_DECL (symbol);
2172 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl)))
2173 output_constant_def_contents (symbol);
2179 name = XSTR (symbol, 0);
2180 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
2181 notice_global_symbol (decl);
2183 /* Compute the alignment of this data. */
2185 align_variable (decl, dont_output_data);
2187 if ((flag_sanitize & SANITIZE_ADDRESS)
2188 && asan_protect_global (decl))
2190 asan_protected = true;
2191 SET_DECL_ALIGN (decl, MAX (DECL_ALIGN (decl),
2192 ASAN_RED_ZONE_SIZE * BITS_PER_UNIT));
2195 set_mem_align (decl_rtl, DECL_ALIGN (decl));
2197 align = get_variable_align (decl);
2199 if (TREE_PUBLIC (decl))
2200 maybe_assemble_visibility (decl);
2202 if (DECL_PRESERVE_P (decl))
2203 targetm.asm_out.mark_decl_preserved (name);
2205 /* First make the assembler name(s) global if appropriate. */
2206 sect = get_variable_section (decl, false);
2207 if (TREE_PUBLIC (decl)
2208 && (sect->common.flags & SECTION_COMMON) == 0)
2209 globalize_decl (decl);
2211 /* Output any data that we will need to use the address of. */
2212 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
2213 output_addressed_constants (DECL_INITIAL (decl));
2215 /* dbxout.c needs to know this. */
2216 if (sect && (sect->common.flags & SECTION_CODE) != 0)
2217 DECL_IN_TEXT_SECTION (decl) = 1;
2219 /* If the decl is part of an object_block, make sure that the decl
2220 has been positioned within its block, but do not write out its
2221 definition yet. output_object_blocks will do that later. */
2222 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2224 gcc_assert (!dont_output_data);
2225 place_block_symbol (symbol);
2227 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
2228 assemble_noswitch_variable (decl, name, sect, align);
2231 /* Special-case handling of vtv comdat sections. */
2232 if (sect->named.name
2233 && (strcmp (sect->named.name, ".vtable_map_vars") == 0))
2234 handle_vtv_comdat_section (sect, decl);
2236 switch_to_section (sect);
2237 if (align > BITS_PER_UNIT)
2238 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
2239 assemble_variable_contents (decl, name, dont_output_data);
2242 unsigned HOST_WIDE_INT int size
2243 = tree_to_uhwi (DECL_SIZE_UNIT (decl));
2244 assemble_zeros (asan_red_zone_size (size));
2250 /* Given a function declaration (FN_DECL), this function assembles the
2251 function into the .preinit_array section. */
2254 assemble_vtv_preinit_initializer (tree fn_decl)
2257 unsigned flags = SECTION_WRITE;
2258 rtx symbol = XEXP (DECL_RTL (fn_decl), 0);
2260 flags |= SECTION_NOTYPE;
2261 sect = get_section (".preinit_array", flags, fn_decl);
2262 switch_to_section (sect);
2263 assemble_addr_to_section (symbol, sect);
2266 /* Return 1 if type TYPE contains any pointers. */
2269 contains_pointers_p (tree type)
2271 switch (TREE_CODE (type))
2274 case REFERENCE_TYPE:
2275 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2276 so I'll play safe and return 1. */
2282 case QUAL_UNION_TYPE:
2285 /* For a type that has fields, see if the fields have pointers. */
2286 for (fields = TYPE_FIELDS (type); fields; fields = DECL_CHAIN (fields))
2287 if (TREE_CODE (fields) == FIELD_DECL
2288 && contains_pointers_p (TREE_TYPE (fields)))
2294 /* An array type contains pointers if its element type does. */
2295 return contains_pointers_p (TREE_TYPE (type));
2302 /* We delay assemble_external processing until
2303 the compilation unit is finalized. This is the best we can do for
2304 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2305 it all the way to final. See PR 17982 for further discussion. */
2306 static GTY(()) tree pending_assemble_externals;
2308 #ifdef ASM_OUTPUT_EXTERNAL
2309 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2310 As a result, assemble_external can be called after the list of externals
2311 is processed and the pointer set destroyed. */
2312 static bool pending_assemble_externals_processed;
2314 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2315 TREE_LIST in assemble_external. */
2316 static hash_set<tree> *pending_assemble_externals_set;
2318 /* True if DECL is a function decl for which no out-of-line copy exists.
2319 It is assumed that DECL's assembler name has been set. */
2322 incorporeal_function_p (tree decl)
2324 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
2328 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
2329 && (DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA
2330 || DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA_WITH_ALIGN))
2333 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
2334 /* Atomic or sync builtins which have survived this far will be
2335 resolved externally and therefore are not incorporeal. */
2336 if (strncmp (name, "__builtin_", 10) == 0)
2342 /* Actually do the tests to determine if this is necessary, and invoke
2343 ASM_OUTPUT_EXTERNAL. */
2345 assemble_external_real (tree decl)
2347 rtx rtl = DECL_RTL (decl);
2349 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
2350 && !SYMBOL_REF_USED (XEXP (rtl, 0))
2351 && !incorporeal_function_p (decl))
2353 /* Some systems do require some output. */
2354 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
2355 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
2361 process_pending_assemble_externals (void)
2363 #ifdef ASM_OUTPUT_EXTERNAL
2365 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
2366 assemble_external_real (TREE_VALUE (list));
2368 pending_assemble_externals = 0;
2369 pending_assemble_externals_processed = true;
2370 delete pending_assemble_externals_set;
2374 /* This TREE_LIST contains any weak symbol declarations waiting
2376 static GTY(()) tree weak_decls;
2378 /* Output something to declare an external symbol to the assembler,
2379 and qualifiers such as weakness. (Most assemblers don't need
2380 extern declaration, so we normally output nothing.) Do nothing if
2381 DECL is not external. */
2384 assemble_external (tree decl ATTRIBUTE_UNUSED)
2386 /* Make sure that the ASM_OUT_FILE is open.
2387 If it's not, we should not be calling this function. */
2388 gcc_assert (asm_out_file);
2390 /* In a perfect world, the following condition would be true.
2391 Sadly, the Java and Go front ends emit assembly *from the front end*,
2392 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2394 /* This function should only be called if we are expanding, or have
2396 Ideally, only final.c would be calling this function, but it is
2397 not clear whether that would break things somehow. See PR 17982
2398 for further discussion. */
2399 gcc_assert (state == EXPANSION
2400 || state == FINISHED);
2403 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
2406 /* We want to output annotation for weak and external symbols at
2407 very last to check if they are references or not. */
2409 if (TARGET_SUPPORTS_WEAK
2411 /* TREE_STATIC is a weird and abused creature which is not
2412 generally the right test for whether an entity has been
2413 locally emitted, inlined or otherwise not-really-extern, but
2414 for declarations that can be weak, it happens to be
2416 && !TREE_STATIC (decl)
2417 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl))
2418 && value_member (decl, weak_decls) == NULL_TREE)
2419 weak_decls = tree_cons (NULL, decl, weak_decls);
2421 #ifdef ASM_OUTPUT_EXTERNAL
2422 if (pending_assemble_externals_processed)
2424 assemble_external_real (decl);
2428 if (! pending_assemble_externals_set->add (decl))
2429 pending_assemble_externals = tree_cons (NULL, decl,
2430 pending_assemble_externals);
2434 /* Similar, for calling a library function FUN. */
2437 assemble_external_libcall (rtx fun)
2439 /* Declare library function name external when first used, if nec. */
2440 if (! SYMBOL_REF_USED (fun))
2442 SYMBOL_REF_USED (fun) = 1;
2443 targetm.asm_out.external_libcall (fun);
2447 /* Assemble a label named NAME. */
2450 assemble_label (FILE *file, const char *name)
2452 ASM_OUTPUT_LABEL (file, name);
2455 /* Set the symbol_referenced flag for ID. */
2457 mark_referenced (tree id)
2459 TREE_SYMBOL_REFERENCED (id) = 1;
2462 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2464 mark_decl_referenced (tree decl)
2466 if (TREE_CODE (decl) == FUNCTION_DECL)
2468 /* Extern inline functions don't become needed when referenced.
2469 If we know a method will be emitted in other TU and no new
2470 functions can be marked reachable, just use the external
2472 struct cgraph_node *node = cgraph_node::get_create (decl);
2473 if (!DECL_EXTERNAL (decl)
2474 && !node->definition)
2475 node->mark_force_output ();
2477 else if (TREE_CODE (decl) == VAR_DECL)
2479 varpool_node *node = varpool_node::get_create (decl);
2480 /* C++ frontend use mark_decl_references to force COMDAT variables
2481 to be output that might appear dead otherwise. */
2482 node->force_output = true;
2484 /* else do nothing - we can get various sorts of CST nodes here,
2485 which do not need to be marked. */
2489 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2490 starts with a *, the rest of NAME is output verbatim. Otherwise
2491 NAME is transformed in a target-specific way (usually by the
2492 addition of an underscore). */
2495 assemble_name_raw (FILE *file, const char *name)
2498 fputs (&name[1], file);
2500 ASM_OUTPUT_LABELREF (file, name);
2503 /* Like assemble_name_raw, but should be used when NAME might refer to
2504 an entity that is also represented as a tree (like a function or
2505 variable). If NAME does refer to such an entity, that entity will
2506 be marked as referenced. */
2509 assemble_name (FILE *file, const char *name)
2511 const char *real_name;
2514 real_name = targetm.strip_name_encoding (name);
2516 id = maybe_get_identifier (real_name);
2521 mark_referenced (id);
2522 ultimate_transparent_alias_target (&id);
2524 name = IDENTIFIER_POINTER (id);
2525 gcc_assert (! TREE_CHAIN (id));
2528 assemble_name_raw (file, name);
2531 /* Allocate SIZE bytes writable static space with a gensym name
2532 and return an RTX to refer to its address. */
2535 assemble_static_space (unsigned HOST_WIDE_INT size)
2538 const char *namestring;
2541 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2543 namestring = ggc_strdup (name);
2545 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2546 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2548 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2549 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2552 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2553 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2556 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2557 so that each uninitialized object starts on such a boundary. */
2558 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2559 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2560 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2561 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2562 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2563 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2570 /* Assemble the static constant template for function entry trampolines.
2571 This is done at most once per compilation.
2572 Returns an RTX for the address of the template. */
2574 static GTY(()) rtx initial_trampoline;
2577 assemble_trampoline_template (void)
2584 gcc_assert (targetm.asm_out.trampoline_template != NULL);
2586 if (initial_trampoline)
2587 return initial_trampoline;
2589 /* By default, put trampoline templates in read-only data section. */
2591 #ifdef TRAMPOLINE_SECTION
2592 switch_to_section (TRAMPOLINE_SECTION);
2594 switch_to_section (readonly_data_section);
2597 /* Write the assembler code to define one. */
2598 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2600 ASM_OUTPUT_ALIGN (asm_out_file, align);
2602 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2603 targetm.asm_out.trampoline_template (asm_out_file);
2605 /* Record the rtl to refer to it. */
2606 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2607 name = ggc_strdup (label);
2608 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2609 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2611 initial_trampoline = gen_const_mem (BLKmode, symbol);
2612 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2613 set_mem_size (initial_trampoline, TRAMPOLINE_SIZE);
2615 return initial_trampoline;
2618 /* A and B are either alignments or offsets. Return the minimum alignment
2619 that may be assumed after adding the two together. */
2621 static inline unsigned
2622 min_align (unsigned int a, unsigned int b)
2624 return (a | b) & -(a | b);
2627 /* Return the assembler directive for creating a given kind of integer
2628 object. SIZE is the number of bytes in the object and ALIGNED_P
2629 indicates whether it is known to be aligned. Return NULL if the
2630 assembly dialect has no such directive.
2632 The returned string should be printed at the start of a new line and
2633 be followed immediately by the object's initial value. */
2636 integer_asm_op (int size, int aligned_p)
2638 struct asm_int_op *ops;
2641 ops = &targetm.asm_out.aligned_op;
2643 ops = &targetm.asm_out.unaligned_op;
2648 return targetm.asm_out.byte_op;
2662 /* Use directive OP to assemble an integer object X. Print OP at the
2663 start of the line, followed immediately by the value of X. */
2666 assemble_integer_with_op (const char *op, rtx x)
2668 fputs (op, asm_out_file);
2669 output_addr_const (asm_out_file, x);
2670 fputc ('\n', asm_out_file);
2673 /* The default implementation of the asm_out.integer target hook. */
2676 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2677 unsigned int size ATTRIBUTE_UNUSED,
2678 int aligned_p ATTRIBUTE_UNUSED)
2680 const char *op = integer_asm_op (size, aligned_p);
2681 /* Avoid GAS bugs for large values. Specifically negative values whose
2682 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2683 if (size > UNITS_PER_WORD && size > POINTER_SIZE_UNITS)
2685 return op && (assemble_integer_with_op (op, x), true);
2688 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2689 the alignment of the integer in bits. Return 1 if we were able to output
2690 the constant, otherwise 0. We must be able to output the constant,
2691 if FORCE is nonzero. */
2694 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2698 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2700 /* See if the target hook can handle this kind of object. */
2701 if (targetm.asm_out.integer (x, size, aligned_p))
2704 /* If the object is a multi-byte one, try splitting it up. Split
2705 it into words it if is multi-word, otherwise split it into bytes. */
2708 machine_mode omode, imode;
2709 unsigned int subalign;
2710 unsigned int subsize, i;
2711 enum mode_class mclass;
2713 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2714 subalign = MIN (align, subsize * BITS_PER_UNIT);
2715 if (GET_CODE (x) == CONST_FIXED)
2716 mclass = GET_MODE_CLASS (GET_MODE (x));
2720 omode = mode_for_size (subsize * BITS_PER_UNIT, mclass, 0);
2721 imode = mode_for_size (size * BITS_PER_UNIT, mclass, 0);
2723 for (i = 0; i < size; i += subsize)
2725 rtx partial = simplify_subreg (omode, x, imode, i);
2726 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2732 /* If we've printed some of it, but not all of it, there's no going
2737 gcc_assert (!force);
2742 /* Assemble the floating-point constant D into an object of size MODE. ALIGN
2743 is the alignment of the constant in bits. If REVERSE is true, D is output
2744 in reverse storage order. */
2747 assemble_real (REAL_VALUE_TYPE d, machine_mode mode, unsigned int align,
2750 long data[4] = {0, 0, 0, 0};
2751 int bitsize, nelts, nunits, units_per;
2754 /* This is hairy. We have a quantity of known size. real_to_target
2755 will put it into an array of *host* longs, 32 bits per element
2756 (even if long is more than 32 bits). We need to determine the
2757 number of array elements that are occupied (nelts) and the number
2758 of *target* min-addressable units that will be occupied in the
2759 object file (nunits). We cannot assume that 32 divides the
2760 mode's bitsize (size * BITS_PER_UNIT) evenly.
2762 size * BITS_PER_UNIT is used here to make sure that padding bits
2763 (which might appear at either end of the value; real_to_target
2764 will include the padding bits in its output array) are included. */
2766 nunits = GET_MODE_SIZE (mode);
2767 bitsize = nunits * BITS_PER_UNIT;
2768 nelts = CEIL (bitsize, 32);
2769 units_per = 32 / BITS_PER_UNIT;
2771 real_to_target (data, &d, mode);
2773 /* Put out the first word with the specified alignment. */
2775 elt = flip_storage_order (SImode, gen_int_mode (data[nelts - 1], SImode));
2777 elt = GEN_INT (data[0]);
2778 assemble_integer (elt, MIN (nunits, units_per), align, 1);
2779 nunits -= units_per;
2781 /* Subsequent words need only 32-bit alignment. */
2782 align = min_align (align, 32);
2784 for (int i = 1; i < nelts; i++)
2787 elt = flip_storage_order (SImode,
2788 gen_int_mode (data[nelts - 1 - i], SImode));
2790 elt = GEN_INT (data[i]);
2791 assemble_integer (elt, MIN (nunits, units_per), align, 1);
2792 nunits -= units_per;
2796 /* Given an expression EXP with a constant value,
2797 reduce it to the sum of an assembler symbol and an integer.
2798 Store them both in the structure *VALUE.
2799 EXP must be reducible. */
2803 HOST_WIDE_INT offset;
2807 decode_addr_const (tree exp, struct addr_const *value)
2809 tree target = TREE_OPERAND (exp, 0);
2815 if (TREE_CODE (target) == COMPONENT_REF
2816 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target, 1))))
2818 offset += int_byte_position (TREE_OPERAND (target, 1));
2819 target = TREE_OPERAND (target, 0);
2821 else if (TREE_CODE (target) == ARRAY_REF
2822 || TREE_CODE (target) == ARRAY_RANGE_REF)
2824 offset += (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target)))
2825 * tree_to_shwi (TREE_OPERAND (target, 1)));
2826 target = TREE_OPERAND (target, 0);
2828 else if (TREE_CODE (target) == MEM_REF
2829 && TREE_CODE (TREE_OPERAND (target, 0)) == ADDR_EXPR)
2831 offset += mem_ref_offset (target).to_short_addr ();
2832 target = TREE_OPERAND (TREE_OPERAND (target, 0), 0);
2834 else if (TREE_CODE (target) == INDIRECT_REF
2835 && TREE_CODE (TREE_OPERAND (target, 0)) == NOP_EXPR
2836 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target, 0), 0))
2838 target = TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target, 0), 0), 0);
2843 switch (TREE_CODE (target))
2847 x = DECL_RTL (target);
2851 x = gen_rtx_MEM (FUNCTION_MODE,
2852 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2861 x = output_constant_def (target, 1);
2868 gcc_assert (MEM_P (x));
2872 value->offset = offset;
2875 static GTY(()) hash_table<tree_descriptor_hasher> *const_desc_htab;
2877 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2879 /* Constant pool accessor function. */
2881 hash_table<tree_descriptor_hasher> *
2882 constant_pool_htab (void)
2884 return const_desc_htab;
2887 /* Compute a hash code for a constant expression. */
2890 tree_descriptor_hasher::hash (constant_descriptor_tree *ptr)
2896 const_hash_1 (const tree exp)
2901 enum tree_code code = TREE_CODE (exp);
2903 /* Either set P and LEN to the address and len of something to hash and
2904 exit the switch or return a value. */
2909 p = (char *) &TREE_INT_CST_ELT (exp, 0);
2910 len = TREE_INT_CST_NUNITS (exp) * sizeof (HOST_WIDE_INT);
2914 return real_hash (TREE_REAL_CST_PTR (exp));
2917 return fixed_hash (TREE_FIXED_CST_PTR (exp));
2920 p = TREE_STRING_POINTER (exp);
2921 len = TREE_STRING_LENGTH (exp);
2925 return (const_hash_1 (TREE_REALPART (exp)) * 5
2926 + const_hash_1 (TREE_IMAGPART (exp)));
2932 hi = 7 + VECTOR_CST_NELTS (exp);
2934 for (i = 0; i < VECTOR_CST_NELTS (exp); ++i)
2935 hi = hi * 563 + const_hash_1 (VECTOR_CST_ELT (exp, i));
2942 unsigned HOST_WIDE_INT idx;
2945 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2947 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2949 hi = hi * 603 + const_hash_1 (value);
2957 struct addr_const value;
2959 decode_addr_const (exp, &value);
2960 switch (GET_CODE (value.base))
2963 /* Don't hash the address of the SYMBOL_REF;
2964 only use the offset and the symbol name. */
2966 p = XSTR (value.base, 0);
2967 for (i = 0; p[i] != 0; i++)
2968 hi = ((hi * 613) + (unsigned) (p[i]));
2973 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (value.base)) * 13);
2983 case POINTER_PLUS_EXPR:
2985 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2986 + const_hash_1 (TREE_OPERAND (exp, 1)));
2989 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2992 /* A language specific constant. Just hash the code. */
2996 /* Compute hashing function. */
2998 for (i = 0; i < len; i++)
2999 hi = ((hi * 613) + (unsigned) (p[i]));
3004 /* Wrapper of compare_constant, for the htab interface. */
3006 tree_descriptor_hasher::equal (constant_descriptor_tree *c1,
3007 constant_descriptor_tree *c2)
3009 if (c1->hash != c2->hash)
3011 return compare_constant (c1->value, c2->value);
3014 /* Compare t1 and t2, and return 1 only if they are known to result in
3015 the same bit pattern on output. */
3018 compare_constant (const tree t1, const tree t2)
3020 enum tree_code typecode;
3022 if (t1 == NULL_TREE)
3023 return t2 == NULL_TREE;
3024 if (t2 == NULL_TREE)
3027 if (TREE_CODE (t1) != TREE_CODE (t2))
3030 switch (TREE_CODE (t1))
3033 /* Integer constants are the same only if the same width of type. */
3034 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
3036 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
3038 return tree_int_cst_equal (t1, t2);
3041 /* Real constants are the same only if the same width of type. */
3042 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
3045 return real_identical (&TREE_REAL_CST (t1), &TREE_REAL_CST (t2));
3048 /* Fixed constants are the same only if the same width of type. */
3049 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
3052 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));
3055 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
3058 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
3059 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
3060 TREE_STRING_LENGTH (t1)));
3063 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
3064 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
3070 if (VECTOR_CST_NELTS (t1) != VECTOR_CST_NELTS (t2))
3073 for (i = 0; i < VECTOR_CST_NELTS (t1); ++i)
3074 if (!compare_constant (VECTOR_CST_ELT (t1, i),
3075 VECTOR_CST_ELT (t2, i)))
3083 vec<constructor_elt, va_gc> *v1, *v2;
3084 unsigned HOST_WIDE_INT idx;
3086 typecode = TREE_CODE (TREE_TYPE (t1));
3087 if (typecode != TREE_CODE (TREE_TYPE (t2)))
3090 if (typecode == ARRAY_TYPE)
3092 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
3093 /* For arrays, check that mode, size and storage order match. */
3094 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
3096 || size_1 != int_size_in_bytes (TREE_TYPE (t2))
3097 || TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t1))
3098 != TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t2)))
3103 /* For record and union constructors, require exact type
3105 if (TREE_TYPE (t1) != TREE_TYPE (t2))
3109 v1 = CONSTRUCTOR_ELTS (t1);
3110 v2 = CONSTRUCTOR_ELTS (t2);
3111 if (vec_safe_length (v1) != vec_safe_length (v2))
3114 for (idx = 0; idx < vec_safe_length (v1); ++idx)
3116 constructor_elt *c1 = &(*v1)[idx];
3117 constructor_elt *c2 = &(*v2)[idx];
3119 /* Check that each value is the same... */
3120 if (!compare_constant (c1->value, c2->value))
3122 /* ... and that they apply to the same fields! */
3123 if (typecode == ARRAY_TYPE)
3125 if (!compare_constant (c1->index, c2->index))
3130 if (c1->index != c2->index)
3141 struct addr_const value1, value2;
3145 decode_addr_const (t1, &value1);
3146 decode_addr_const (t2, &value2);
3148 if (value1.offset != value2.offset)
3151 code = GET_CODE (value1.base);
3152 if (code != GET_CODE (value2.base))
3158 ret = (strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
3162 ret = (CODE_LABEL_NUMBER (LABEL_REF_LABEL (value1.base))
3163 == CODE_LABEL_NUMBER (LABEL_REF_LABEL (value2.base)));
3173 case POINTER_PLUS_EXPR:
3176 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
3177 && compare_constant (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
3180 case VIEW_CONVERT_EXPR:
3181 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3190 /* Return the section into which constant EXP should be placed. */
3193 get_constant_section (tree exp, unsigned int align)
3195 return targetm.asm_out.select_section (exp,
3196 compute_reloc_for_constant (exp),
3200 /* Return the size of constant EXP in bytes. */
3202 static HOST_WIDE_INT
3203 get_constant_size (tree exp)
3207 size = int_size_in_bytes (TREE_TYPE (exp));
3208 if (TREE_CODE (exp) == STRING_CST)
3209 size = MAX (TREE_STRING_LENGTH (exp), size);
3213 /* Subroutine of output_constant_def:
3214 No constant equal to EXP is known to have been output.
3215 Make a constant descriptor to enter EXP in the hash table.
3216 Assign the label number and construct RTL to refer to the
3217 constant's location in memory.
3218 Caller is responsible for updating the hash table. */
3220 static struct constant_descriptor_tree *
3221 build_constant_desc (tree exp)
3223 struct constant_descriptor_tree *desc;
3229 desc = ggc_alloc<constant_descriptor_tree> ();
3232 /* Create a string containing the label name, in LABEL. */
3233 labelno = const_labelno++;
3234 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
3236 /* Construct the VAR_DECL associated with the constant. */
3237 decl = build_decl (UNKNOWN_LOCATION, VAR_DECL, get_identifier (label),
3239 DECL_ARTIFICIAL (decl) = 1;
3240 DECL_IGNORED_P (decl) = 1;
3241 TREE_READONLY (decl) = 1;
3242 TREE_STATIC (decl) = 1;
3243 TREE_ADDRESSABLE (decl) = 1;
3244 /* We don't set the RTL yet as this would cause varpool to assume that the
3245 variable is referenced. Moreover, it would just be dropped in LTO mode.
3246 Instead we set the flag that will be recognized in make_decl_rtl. */
3247 DECL_IN_CONSTANT_POOL (decl) = 1;
3248 DECL_INITIAL (decl) = desc->value;
3249 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3250 architectures so use DATA_ALIGNMENT as well, except for strings. */
3251 if (TREE_CODE (exp) == STRING_CST)
3253 SET_DECL_ALIGN (decl, CONSTANT_ALIGNMENT (exp, DECL_ALIGN (decl)));
3256 align_variable (decl, 0);
3258 /* Now construct the SYMBOL_REF and the MEM. */
3259 if (use_object_blocks_p ())
3261 int align = (TREE_CODE (decl) == CONST_DECL
3262 || (TREE_CODE (decl) == VAR_DECL
3263 && DECL_IN_CONSTANT_POOL (decl))
3265 : symtab_node::get (decl)->definition_alignment ());
3266 section *sect = get_constant_section (exp, align);
3267 symbol = create_block_symbol (ggc_strdup (label),
3268 get_block_for_section (sect), -1);
3271 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3272 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3273 SET_SYMBOL_REF_DECL (symbol, decl);
3274 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3276 rtl = gen_const_mem (TYPE_MODE (TREE_TYPE (exp)), symbol);
3277 set_mem_attributes (rtl, exp, 1);
3278 set_mem_alias_set (rtl, 0);
3280 /* Putting EXP into the literal pool might have imposed a different
3281 alignment which should be visible in the RTX as well. */
3282 set_mem_align (rtl, DECL_ALIGN (decl));
3284 /* We cannot share RTX'es in pool entries.
3285 Mark this piece of RTL as required for unsharing. */
3286 RTX_FLAG (rtl, used) = 1;
3288 /* Set flags or add text to the name to record information, such as
3289 that it is a local symbol. If the name is changed, the macro
3290 ASM_OUTPUT_LABELREF will have to know how to strip this
3291 information. This call might invalidate our local variable
3292 SYMBOL; we can't use it afterward. */
3293 targetm.encode_section_info (exp, rtl, true);
3300 /* Return an rtx representing a reference to constant data in memory
3301 for the constant expression EXP.
3303 If assembler code for such a constant has already been output,
3304 return an rtx to refer to it.
3305 Otherwise, output such a constant in memory
3306 and generate an rtx for it.
3308 If DEFER is nonzero, this constant can be deferred and output only
3309 if referenced in the function after all optimizations.
3311 `const_desc_table' records which constants already have label strings. */
3314 output_constant_def (tree exp, int defer)
3316 struct constant_descriptor_tree *desc;
3317 struct constant_descriptor_tree key;
3319 /* Look up EXP in the table of constant descriptors. If we didn't find
3320 it, create a new one. */
3322 key.hash = const_hash_1 (exp);
3323 constant_descriptor_tree **loc
3324 = const_desc_htab->find_slot_with_hash (&key, key.hash, INSERT);
3329 desc = build_constant_desc (exp);
3330 desc->hash = key.hash;
3334 maybe_output_constant_def_contents (desc, defer);
3338 /* Subroutine of output_constant_def: Decide whether or not we need to
3339 output the constant DESC now, and if so, do it. */
3341 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
3344 rtx symbol = XEXP (desc->rtl, 0);
3345 tree exp = desc->value;
3347 if (flag_syntax_only)
3350 if (TREE_ASM_WRITTEN (exp))
3351 /* Already output; don't do it again. */
3354 /* We can always defer constants as long as the context allows
3358 /* Increment n_deferred_constants if it exists. It needs to be at
3359 least as large as the number of constants actually referred to
3360 by the function. If it's too small we'll stop looking too early
3361 and fail to emit constants; if it's too large we'll only look
3362 through the entire function when we could have stopped earlier. */
3364 n_deferred_constants++;
3368 output_constant_def_contents (symbol);
3371 /* Subroutine of output_constant_def_contents. Output the definition
3372 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3373 constant's alignment in bits. */
3376 assemble_constant_contents (tree exp, const char *label, unsigned int align)
3380 size = get_constant_size (exp);
3382 /* Do any machine/system dependent processing of the constant. */
3383 targetm.asm_out.declare_constant_name (asm_out_file, label, exp, size);
3385 /* Output the value of EXP. */
3386 output_constant (exp, size, align, false);
3388 targetm.asm_out.decl_end ();
3391 /* We must output the constant data referred to by SYMBOL; do so. */
3394 output_constant_def_contents (rtx symbol)
3396 tree decl = SYMBOL_REF_DECL (symbol);
3397 tree exp = DECL_INITIAL (decl);
3398 bool asan_protected = false;
3400 /* Make sure any other constants whose addresses appear in EXP
3401 are assigned label numbers. */
3402 output_addressed_constants (exp);
3404 /* We are no longer deferring this constant. */
3405 TREE_ASM_WRITTEN (decl) = TREE_ASM_WRITTEN (exp) = 1;
3407 if ((flag_sanitize & SANITIZE_ADDRESS)
3408 && TREE_CODE (exp) == STRING_CST
3409 && asan_protect_global (exp))
3411 asan_protected = true;
3412 SET_DECL_ALIGN (decl, MAX (DECL_ALIGN (decl),
3413 ASAN_RED_ZONE_SIZE * BITS_PER_UNIT));
3416 /* If the constant is part of an object block, make sure that the
3417 decl has been positioned within its block, but do not write out
3418 its definition yet. output_object_blocks will do that later. */
3419 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
3420 place_block_symbol (symbol);
3423 int align = (TREE_CODE (decl) == CONST_DECL
3424 || (TREE_CODE (decl) == VAR_DECL
3425 && DECL_IN_CONSTANT_POOL (decl))
3427 : symtab_node::get (decl)->definition_alignment ());
3428 switch_to_section (get_constant_section (exp, align));
3429 if (align > BITS_PER_UNIT)
3430 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
3431 assemble_constant_contents (exp, XSTR (symbol, 0), align);
3434 HOST_WIDE_INT size = get_constant_size (exp);
3435 assemble_zeros (asan_red_zone_size (size));
3440 /* Look up EXP in the table of constant descriptors. Return the rtl
3441 if it has been emitted, else null. */
3444 lookup_constant_def (tree exp)
3446 struct constant_descriptor_tree key;
3449 key.hash = const_hash_1 (exp);
3450 constant_descriptor_tree *desc
3451 = const_desc_htab->find_with_hash (&key, key.hash);
3453 return (desc ? desc->rtl : NULL_RTX);
3456 /* Return a tree representing a reference to constant data in memory
3457 for the constant expression EXP.
3459 This is the counterpart of output_constant_def at the Tree level. */
3462 tree_output_constant_def (tree exp)
3464 struct constant_descriptor_tree *desc, key;
3467 /* Look up EXP in the table of constant descriptors. If we didn't find
3468 it, create a new one. */
3470 key.hash = const_hash_1 (exp);
3471 constant_descriptor_tree **loc
3472 = const_desc_htab->find_slot_with_hash (&key, key.hash, INSERT);
3477 desc = build_constant_desc (exp);
3478 desc->hash = key.hash;
3482 decl = SYMBOL_REF_DECL (XEXP (desc->rtl, 0));
3483 varpool_node::finalize_decl (decl);
3487 struct GTY((chain_next ("%h.next"), for_user)) constant_descriptor_rtx {
3488 struct constant_descriptor_rtx *next;
3492 HOST_WIDE_INT offset;
3500 struct const_rtx_desc_hasher : ggc_ptr_hash<constant_descriptor_rtx>
3502 static hashval_t hash (constant_descriptor_rtx *);
3503 static bool equal (constant_descriptor_rtx *, constant_descriptor_rtx *);
3506 /* Used in the hash tables to avoid outputting the same constant
3507 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3508 are output once per function, not once per file. */
3509 /* ??? Only a few targets need per-function constant pools. Most
3510 can use one per-file pool. Should add a targetm bit to tell the
3513 struct GTY(()) rtx_constant_pool {
3514 /* Pointers to first and last constant in pool, as ordered by offset. */
3515 struct constant_descriptor_rtx *first;
3516 struct constant_descriptor_rtx *last;
3518 /* Hash facility for making memory-constants from constant rtl-expressions.
3519 It is used on RISC machines where immediate integer arguments and
3520 constant addresses are restricted so that such constants must be stored
3522 hash_table<const_rtx_desc_hasher> *const_rtx_htab;
3524 /* Current offset in constant pool (does not include any
3525 machine-specific header). */
3526 HOST_WIDE_INT offset;
3529 /* Hash and compare functions for const_rtx_htab. */
3532 const_rtx_desc_hasher::hash (constant_descriptor_rtx *desc)
3538 const_rtx_desc_hasher::equal (constant_descriptor_rtx *x,
3539 constant_descriptor_rtx *y)
3541 if (x->mode != y->mode)
3543 return rtx_equal_p (x->constant, y->constant);
3546 /* Hash one component of a constant. */
3549 const_rtx_hash_1 (const_rtx x)
3551 unsigned HOST_WIDE_INT hwi;
3557 code = GET_CODE (x);
3558 mode = GET_MODE (x);
3559 h = (hashval_t) code * 1048573 + mode;
3568 int shift = sizeof (hashval_t) * CHAR_BIT;
3569 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3571 h ^= (hashval_t) hwi;
3572 for (i = 1; i < n; ++i)
3575 h ^= (hashval_t) hwi;
3580 case CONST_WIDE_INT:
3581 hwi = GET_MODE_PRECISION (mode);
3583 for (i = 0; i < CONST_WIDE_INT_NUNITS (x); i++)
3584 hwi ^= CONST_WIDE_INT_ELT (x, i);
3589 if (TARGET_SUPPORTS_WIDE_INT == 0 && mode == VOIDmode)
3591 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3595 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3599 h ^= fixed_hash (CONST_FIXED_VALUE (x));
3603 h ^= htab_hash_string (XSTR (x, 0));
3607 h = h * 251 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (x));
3611 case UNSPEC_VOLATILE:
3612 h = h * 251 + XINT (x, 1);
3622 /* Compute a hash value for X, which should be a constant. */
3625 const_rtx_hash (rtx x)
3628 subrtx_iterator::array_type array;
3629 FOR_EACH_SUBRTX (iter, array, x, ALL)
3630 h = h * 509 + const_rtx_hash_1 (*iter);
3635 /* Create and return a new rtx constant pool. */
3637 static struct rtx_constant_pool *
3638 create_constant_pool (void)
3640 struct rtx_constant_pool *pool;
3642 pool = ggc_alloc<rtx_constant_pool> ();
3643 pool->const_rtx_htab = hash_table<const_rtx_desc_hasher>::create_ggc (31);
3650 /* Initialize constant pool hashing for a new function. */
3653 init_varasm_status (void)
3655 crtl->varasm.pool = create_constant_pool ();
3656 crtl->varasm.deferred_constants = 0;
3659 /* Given a MINUS expression, simplify it if both sides
3660 include the same symbol. */
3663 simplify_subtraction (rtx x)
3665 rtx r = simplify_rtx (x);
3669 /* Given a constant rtx X, make (or find) a memory constant for its value
3670 and return a MEM rtx to refer to it in memory. */
3673 force_const_mem (machine_mode mode, rtx x)
3675 struct constant_descriptor_rtx *desc, tmp;
3676 struct rtx_constant_pool *pool;
3681 constant_descriptor_rtx **slot;
3683 /* If we're not allowed to drop X into the constant pool, don't. */
3684 if (targetm.cannot_force_const_mem (mode, x))
3687 /* Record that this function has used a constant pool entry. */
3688 crtl->uses_const_pool = 1;
3690 /* Decide which pool to use. */
3691 pool = (targetm.use_blocks_for_constant_p (mode, x)
3692 ? shared_constant_pool
3693 : crtl->varasm.pool);
3695 /* Lookup the value in the hashtable. */
3698 hash = const_rtx_hash (x);
3699 slot = pool->const_rtx_htab->find_slot_with_hash (&tmp, hash, INSERT);
3702 /* If the constant was already present, return its memory. */
3704 return copy_rtx (desc->mem);
3706 /* Otherwise, create a new descriptor. */
3707 desc = ggc_alloc<constant_descriptor_rtx> ();
3710 /* Align the location counter as required by EXP's data type. */
3711 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3713 tree type = lang_hooks.types.type_for_mode (mode, 0);
3714 if (type != NULL_TREE)
3715 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3717 pool->offset += (align / BITS_PER_UNIT) - 1;
3718 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3721 desc->constant = copy_rtx (tmp.constant);
3722 desc->offset = pool->offset;
3725 desc->align = align;
3726 desc->labelno = const_labelno;
3729 pool->offset += GET_MODE_SIZE (mode);
3731 pool->last->next = desc;
3733 pool->first = pool->last = desc;
3736 /* Create a string containing the label name, in LABEL. */
3737 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3740 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3741 the constants pool. */
3742 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3744 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3745 symbol = create_block_symbol (ggc_strdup (label),
3746 get_block_for_section (sect), -1);
3749 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3751 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3752 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3753 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3755 /* Construct the MEM. */
3756 desc->mem = def = gen_const_mem (mode, symbol);
3757 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3758 set_mem_align (def, align);
3760 /* If we're dropping a label to the constant pool, make sure we
3762 if (GET_CODE (x) == LABEL_REF)
3763 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3765 return copy_rtx (def);
3768 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3771 get_pool_constant (const_rtx addr)
3773 return SYMBOL_REF_CONSTANT (addr)->constant;
3776 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3777 and whether it has been output or not. */
3780 get_pool_constant_mark (rtx addr, bool *pmarked)
3782 struct constant_descriptor_rtx *desc;
3784 desc = SYMBOL_REF_CONSTANT (addr);
3785 *pmarked = (desc->mark != 0);
3786 return desc->constant;
3789 /* Similar, return the mode. */
3792 get_pool_mode (const_rtx addr)
3794 return SYMBOL_REF_CONSTANT (addr)->mode;
3797 /* Return the size of the constant pool. */
3800 get_pool_size (void)
3802 return crtl->varasm.pool->offset;
3805 /* Worker function for output_constant_pool_1. Emit assembly for X
3806 in MODE with known alignment ALIGN. */
3809 output_constant_pool_2 (machine_mode mode, rtx x, unsigned int align)
3811 switch (GET_MODE_CLASS (mode))
3814 case MODE_DECIMAL_FLOAT:
3816 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x));
3817 assemble_real (*CONST_DOUBLE_REAL_VALUE (x), mode, align, false);
3822 case MODE_PARTIAL_INT:
3827 case MODE_POINTER_BOUNDS:
3828 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3831 case MODE_VECTOR_FLOAT:
3832 case MODE_VECTOR_INT:
3833 case MODE_VECTOR_FRACT:
3834 case MODE_VECTOR_UFRACT:
3835 case MODE_VECTOR_ACCUM:
3836 case MODE_VECTOR_UACCUM:
3839 machine_mode submode = GET_MODE_INNER (mode);
3840 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3842 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3843 units = CONST_VECTOR_NUNITS (x);
3845 for (i = 0; i < units; i++)
3847 rtx elt = CONST_VECTOR_ELT (x, i);
3848 output_constant_pool_2 (submode, elt, i ? subalign : align);
3858 /* Worker function for output_constant_pool. Emit constant DESC,
3859 giving it ALIGN bits of alignment. */
3862 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3869 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3870 whose CODE_LABEL has been deleted. This can occur if a jump table
3871 is eliminated by optimization. If so, write a constant of zero
3872 instead. Note that this can also happen by turning the
3873 CODE_LABEL into a NOTE. */
3874 /* ??? This seems completely and utterly wrong. Certainly it's
3875 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3876 functioning even with rtx_insn::deleted and friends. */
3879 switch (GET_CODE (tmp))
3882 if (GET_CODE (XEXP (tmp, 0)) != PLUS
3883 || GET_CODE (XEXP (XEXP (tmp, 0), 0)) != LABEL_REF)
3885 tmp = XEXP (XEXP (tmp, 0), 0);
3889 tmp = LABEL_REF_LABEL (tmp);
3890 gcc_assert (!as_a<rtx_insn *> (tmp)->deleted ());
3891 gcc_assert (!NOTE_P (tmp)
3892 || NOTE_KIND (tmp) != NOTE_INSN_DELETED);
3899 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3900 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3901 align, desc->labelno, done);
3904 assemble_align (align);
3906 /* Output the label. */
3907 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3910 Pass actual alignment value while emitting string constant to asm code
3911 as function 'output_constant_pool_1' explicitly passes the alignment as 1
3912 assuming that the data is already aligned which prevents the generation
3913 of fix-up table entries. */
3914 output_constant_pool_2 (desc->mode, x, desc->align);
3916 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3917 sections have proper size. */
3918 if (align > GET_MODE_BITSIZE (desc->mode)
3920 && (in_section->common.flags & SECTION_MERGE))
3921 assemble_align (align);
3923 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3929 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3930 Emit referenced deferred strings. */
3933 mark_constants_in_pattern (rtx insn)
3935 subrtx_iterator::array_type array;
3936 FOR_EACH_SUBRTX (iter, array, PATTERN (insn), ALL)
3938 const_rtx x = *iter;
3939 if (GET_CODE (x) == SYMBOL_REF)
3941 if (CONSTANT_POOL_ADDRESS_P (x))
3943 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3944 if (desc->mark == 0)
3947 iter.substitute (desc->constant);
3950 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3952 tree decl = SYMBOL_REF_DECL (x);
3953 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl)))
3955 n_deferred_constants--;
3956 output_constant_def_contents (CONST_CAST_RTX (x));
3963 /* Look through appropriate parts of INSN, marking all entries in the
3964 constant pool which are actually being used. Entries that are only
3965 referenced by other constants are also marked as used. Emit
3966 deferred strings that are used. */
3969 mark_constants (rtx_insn *insn)
3974 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3975 insns, not any notes that may be attached. We don't want to mark
3976 a constant just because it happens to appear in a REG_EQUIV note. */
3977 if (rtx_sequence *seq = dyn_cast <rtx_sequence *> (PATTERN (insn)))
3979 int i, n = seq->len ();
3980 for (i = 0; i < n; ++i)
3982 rtx subinsn = seq->element (i);
3983 if (INSN_P (subinsn))
3984 mark_constants_in_pattern (subinsn);
3988 mark_constants_in_pattern (insn);
3991 /* Look through the instructions for this function, and mark all the
3992 entries in POOL which are actually being used. Emit deferred constants
3993 which have indeed been used. */
3996 mark_constant_pool (void)
4000 if (!crtl->uses_const_pool && n_deferred_constants == 0)
4003 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
4004 mark_constants (insn);
4007 /* Write all the constants in POOL. */
4010 output_constant_pool_contents (struct rtx_constant_pool *pool)
4012 struct constant_descriptor_rtx *desc;
4014 for (desc = pool->first; desc ; desc = desc->next)
4017 /* If the constant is part of an object_block, make sure that
4018 the constant has been positioned within its block, but do not
4019 write out its definition yet. output_object_blocks will do
4021 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
4022 && SYMBOL_REF_BLOCK (desc->sym))
4023 place_block_symbol (desc->sym);
4026 switch_to_section (targetm.asm_out.select_rtx_section
4027 (desc->mode, desc->constant, desc->align));
4028 output_constant_pool_1 (desc, desc->align);
4033 /* Mark all constants that are used in the current function, then write
4034 out the function's private constant pool. */
4037 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
4038 tree fndecl ATTRIBUTE_UNUSED)
4040 struct rtx_constant_pool *pool = crtl->varasm.pool;
4042 /* It is possible for gcc to call force_const_mem and then to later
4043 discard the instructions which refer to the constant. In such a
4044 case we do not need to output the constant. */
4045 mark_constant_pool ();
4047 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4048 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
4051 output_constant_pool_contents (pool);
4053 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4054 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
4058 /* Write the contents of the shared constant pool. */
4061 output_shared_constant_pool (void)
4063 output_constant_pool_contents (shared_constant_pool);
4066 /* Determine what kind of relocations EXP may need. */
4069 compute_reloc_for_constant (tree exp)
4071 int reloc = 0, reloc2;
4074 switch (TREE_CODE (exp))
4078 /* Go inside any operations that get_inner_reference can handle and see
4079 if what's inside is a constant: no need to do anything here for
4080 addresses of variables or functions. */
4081 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
4082 tem = TREE_OPERAND (tem, 0))
4085 if (TREE_CODE (tem) == MEM_REF
4086 && TREE_CODE (TREE_OPERAND (tem, 0)) == ADDR_EXPR)
4088 reloc = compute_reloc_for_constant (TREE_OPERAND (tem, 0));
4092 if (!targetm.binds_local_p (tem))
4099 case POINTER_PLUS_EXPR:
4100 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4101 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
4105 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4106 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
4107 /* The difference of two local labels is computable at link time. */
4108 if (reloc == 1 && reloc2 == 1)
4115 case VIEW_CONVERT_EXPR:
4116 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4121 unsigned HOST_WIDE_INT idx;
4122 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4124 reloc |= compute_reloc_for_constant (tem);
4134 /* Find all the constants whose addresses are referenced inside of EXP,
4135 and make sure assembler code with a label has been output for each one.
4136 Indicate whether an ADDR_EXPR has been encountered. */
4139 output_addressed_constants (tree exp)
4143 switch (TREE_CODE (exp))
4147 /* Go inside any operations that get_inner_reference can handle and see
4148 if what's inside is a constant: no need to do anything here for
4149 addresses of variables or functions. */
4150 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
4151 tem = TREE_OPERAND (tem, 0))
4154 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4155 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
4156 tem = DECL_INITIAL (tem);
4158 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
4159 output_constant_def (tem, 0);
4161 if (TREE_CODE (tem) == MEM_REF)
4162 output_addressed_constants (TREE_OPERAND (tem, 0));
4166 case POINTER_PLUS_EXPR:
4168 output_addressed_constants (TREE_OPERAND (exp, 1));
4172 case VIEW_CONVERT_EXPR:
4173 output_addressed_constants (TREE_OPERAND (exp, 0));
4178 unsigned HOST_WIDE_INT idx;
4179 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4181 output_addressed_constants (tem);
4190 /* Whether a constructor CTOR is a valid static constant initializer if all
4191 its elements are. This used to be internal to initializer_constant_valid_p
4192 and has been exposed to let other functions like categorize_ctor_elements
4193 evaluate the property while walking a constructor for other purposes. */
4196 constructor_static_from_elts_p (const_tree ctor)
4198 return (TREE_CONSTANT (ctor)
4199 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4200 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE
4201 || TREE_CODE (TREE_TYPE (ctor)) == ARRAY_TYPE));
4204 static tree initializer_constant_valid_p_1 (tree value, tree endtype,
4207 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4208 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4209 which are valid when ENDTYPE is an integer of any size; in
4210 particular, this does not accept a pointer minus a constant. This
4211 returns null_pointer_node if the VALUE is an absolute constant
4212 which can be used to initialize a static variable. Otherwise it
4216 narrowing_initializer_constant_valid_p (tree value, tree endtype, tree *cache)
4220 if (!INTEGRAL_TYPE_P (endtype))
4223 op0 = TREE_OPERAND (value, 0);
4224 op1 = TREE_OPERAND (value, 1);
4226 /* Like STRIP_NOPS except allow the operand mode to widen. This
4227 works around a feature of fold that simplifies (int)(p1 - p2) to
4228 ((int)p1 - (int)p2) under the theory that the narrower operation
4231 while (CONVERT_EXPR_P (op0)
4232 || TREE_CODE (op0) == NON_LVALUE_EXPR)
4234 tree inner = TREE_OPERAND (op0, 0);
4235 if (inner == error_mark_node
4236 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4237 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
4238 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4243 while (CONVERT_EXPR_P (op1)
4244 || TREE_CODE (op1) == NON_LVALUE_EXPR)
4246 tree inner = TREE_OPERAND (op1, 0);
4247 if (inner == error_mark_node
4248 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4249 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
4250 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4255 op0 = initializer_constant_valid_p_1 (op0, endtype, cache);
4259 op1 = initializer_constant_valid_p_1 (op1, endtype,
4260 cache ? cache + 2 : NULL);
4261 /* Both initializers must be known. */
4265 && (op0 == null_pointer_node
4266 || TREE_CODE (value) == MINUS_EXPR))
4267 return null_pointer_node;
4269 /* Support differences between labels. */
4270 if (TREE_CODE (op0) == LABEL_DECL
4271 && TREE_CODE (op1) == LABEL_DECL)
4272 return null_pointer_node;
4274 if (TREE_CODE (op0) == STRING_CST
4275 && TREE_CODE (op1) == STRING_CST
4276 && operand_equal_p (op0, op1, 1))
4277 return null_pointer_node;
4283 /* Helper function of initializer_constant_valid_p.
4284 Return nonzero if VALUE is a valid constant-valued expression
4285 for use in initializing a static variable; one that can be an
4286 element of a "constant" initializer.
4288 Return null_pointer_node if the value is absolute;
4289 if it is relocatable, return the variable that determines the relocation.
4290 We assume that VALUE has been folded as much as possible;
4291 therefore, we do not need to check for such things as
4292 arithmetic-combinations of integers.
4294 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4297 initializer_constant_valid_p_1 (tree value, tree endtype, tree *cache)
4301 switch (TREE_CODE (value))
4304 if (constructor_static_from_elts_p (value))
4306 unsigned HOST_WIDE_INT idx;
4308 bool absolute = true;
4310 if (cache && cache[0] == value)
4312 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4315 reloc = initializer_constant_valid_p_1 (elt, TREE_TYPE (elt),
4318 /* An absolute value is required with reverse SSO. */
4319 || (reloc != null_pointer_node
4320 && TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (value))
4321 && !AGGREGATE_TYPE_P (TREE_TYPE (elt))))
4326 cache[1] = NULL_TREE;
4330 if (reloc != null_pointer_node)
4333 /* For a non-absolute relocation, there is no single
4334 variable that can be "the variable that determines the
4339 cache[1] = absolute ? null_pointer_node : error_mark_node;
4341 return absolute ? null_pointer_node : error_mark_node;
4344 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
4352 return null_pointer_node;
4357 tree op0 = staticp (TREE_OPERAND (value, 0));
4360 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4361 to be a constant, this is old-skool offsetof-like nonsense. */
4362 if (TREE_CODE (op0) == INDIRECT_REF
4363 && TREE_CONSTANT (TREE_OPERAND (op0, 0)))
4364 return null_pointer_node;
4365 /* Taking the address of a nested function involves a trampoline,
4366 unless we don't need or want one. */
4367 if (TREE_CODE (op0) == FUNCTION_DECL
4368 && DECL_STATIC_CHAIN (op0)
4369 && !TREE_NO_TRAMPOLINE (value))
4371 /* "&{...}" requires a temporary to hold the constructed
4373 if (TREE_CODE (op0) == CONSTRUCTOR)
4379 case NON_LVALUE_EXPR:
4380 return initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4383 case VIEW_CONVERT_EXPR:
4385 tree src = TREE_OPERAND (value, 0);
4386 tree src_type = TREE_TYPE (src);
4387 tree dest_type = TREE_TYPE (value);
4389 /* Allow view-conversions from aggregate to non-aggregate type only
4390 if the bit pattern is fully preserved afterwards; otherwise, the
4391 RTL expander won't be able to apply a subsequent transformation
4392 to the underlying constructor. */
4393 if (AGGREGATE_TYPE_P (src_type) && !AGGREGATE_TYPE_P (dest_type))
4395 if (TYPE_MODE (endtype) == TYPE_MODE (dest_type))
4396 return initializer_constant_valid_p_1 (src, endtype, cache);
4401 /* Allow all other kinds of view-conversion. */
4402 return initializer_constant_valid_p_1 (src, endtype, cache);
4407 tree src = TREE_OPERAND (value, 0);
4408 tree src_type = TREE_TYPE (src);
4409 tree dest_type = TREE_TYPE (value);
4411 /* Allow conversions between pointer types, floating-point
4412 types, and offset types. */
4413 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
4414 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
4415 || (TREE_CODE (dest_type) == OFFSET_TYPE
4416 && TREE_CODE (src_type) == OFFSET_TYPE))
4417 return initializer_constant_valid_p_1 (src, endtype, cache);
4419 /* Allow length-preserving conversions between integer types. */
4420 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
4421 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
4422 return initializer_constant_valid_p_1 (src, endtype, cache);
4424 /* Allow conversions between other integer types only if
4426 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
4428 tree inner = initializer_constant_valid_p_1 (src, endtype, cache);
4429 if (inner == null_pointer_node)
4430 return null_pointer_node;
4434 /* Allow (int) &foo provided int is as wide as a pointer. */
4435 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
4436 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
4437 return initializer_constant_valid_p_1 (src, endtype, cache);
4439 /* Likewise conversions from int to pointers, but also allow
4440 conversions from 0. */
4441 if ((POINTER_TYPE_P (dest_type)
4442 || TREE_CODE (dest_type) == OFFSET_TYPE)
4443 && INTEGRAL_TYPE_P (src_type))
4445 if (TREE_CODE (src) == INTEGER_CST
4446 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
4447 return null_pointer_node;
4448 if (integer_zerop (src))
4449 return null_pointer_node;
4450 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
4451 return initializer_constant_valid_p_1 (src, endtype, cache);
4454 /* Allow conversions to struct or union types if the value
4456 if (TREE_CODE (dest_type) == RECORD_TYPE
4457 || TREE_CODE (dest_type) == UNION_TYPE)
4458 return initializer_constant_valid_p_1 (src, endtype, cache);
4462 case POINTER_PLUS_EXPR:
4464 /* Any valid floating-point constants will have been folded by now;
4465 with -frounding-math we hit this with addition of two constants. */
4466 if (TREE_CODE (endtype) == REAL_TYPE)
4468 if (cache && cache[0] == value)
4470 if (! INTEGRAL_TYPE_P (endtype)
4471 || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
4473 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4475 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4478 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4479 endtype, ncache + 2);
4480 /* If either term is absolute, use the other term's relocation. */
4481 if (valid0 == null_pointer_node)
4483 else if (valid1 == null_pointer_node)
4485 /* Support narrowing pointer differences. */
4487 ret = narrowing_initializer_constant_valid_p (value, endtype,
4491 /* Support narrowing pointer differences. */
4492 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4501 if (TREE_CODE (endtype) == REAL_TYPE)
4503 if (cache && cache[0] == value)
4505 if (! INTEGRAL_TYPE_P (endtype)
4506 || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
4508 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4510 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4513 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4514 endtype, ncache + 2);
4515 /* Win if second argument is absolute. */
4516 if (valid1 == null_pointer_node)
4518 /* Win if both arguments have the same relocation.
4519 Then the value is absolute. */
4520 else if (valid0 == valid1 && valid0 != 0)
4521 ret = null_pointer_node;
4522 /* Since GCC guarantees that string constants are unique in the
4523 generated code, a subtraction between two copies of the same
4524 constant string is absolute. */
4525 else if (valid0 && TREE_CODE (valid0) == STRING_CST
4526 && valid1 && TREE_CODE (valid1) == STRING_CST
4527 && operand_equal_p (valid0, valid1, 1))
4528 ret = null_pointer_node;
4529 /* Support narrowing differences. */
4531 ret = narrowing_initializer_constant_valid_p (value, endtype,
4535 /* Support narrowing differences. */
4536 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4551 /* Return nonzero if VALUE is a valid constant-valued expression
4552 for use in initializing a static variable; one that can be an
4553 element of a "constant" initializer.
4555 Return null_pointer_node if the value is absolute;
4556 if it is relocatable, return the variable that determines the relocation.
4557 We assume that VALUE has been folded as much as possible;
4558 therefore, we do not need to check for such things as
4559 arithmetic-combinations of integers. */
4561 initializer_constant_valid_p (tree value, tree endtype, bool reverse)
4563 tree reloc = initializer_constant_valid_p_1 (value, endtype, NULL);
4565 /* An absolute value is required with reverse storage order. */
4567 && reloc != null_pointer_node
4569 && !AGGREGATE_TYPE_P (endtype)
4570 && !VECTOR_TYPE_P (endtype))
4576 /* Return true if VALUE is a valid constant-valued expression
4577 for use in initializing a static bit-field; one that can be
4578 an element of a "constant" initializer. */
4581 initializer_constant_valid_for_bitfield_p (tree value)
4583 /* For bitfields we support integer constants or possibly nested aggregates
4585 switch (TREE_CODE (value))
4589 unsigned HOST_WIDE_INT idx;
4592 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4593 if (!initializer_constant_valid_for_bitfield_p (elt))
4602 case VIEW_CONVERT_EXPR:
4603 case NON_LVALUE_EXPR:
4605 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value, 0));
4614 /* output_constructor outer state of relevance in recursive calls, typically
4615 for nested aggregate bitfields. */
4617 struct oc_outer_state {
4618 unsigned int bit_offset; /* current position in ... */
4619 int byte; /* ... the outer byte buffer. */
4622 static unsigned HOST_WIDE_INT
4623 output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int, bool,
4626 /* Output assembler code for constant EXP, with no label.
4627 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4628 Assumes output_addressed_constants has been done on EXP already.
4630 Generate at least SIZE bytes of assembler data, padding at the end
4631 with zeros if necessary. SIZE must always be specified. The returned
4632 value is the actual number of bytes of assembler data generated, which
4633 may be bigger than SIZE if the object contains a variable length field.
4635 SIZE is important for structure constructors,
4636 since trailing members may have been omitted from the constructor.
4637 It is also important for initialization of arrays from string constants
4638 since the full length of the string constant might not be wanted.
4639 It is also needed for initialization of unions, where the initializer's
4640 type is just one member, and that may not be as long as the union.
4642 There a case in which we would fail to output exactly SIZE bytes:
4643 for a structure constructor that wants to produce more than SIZE bytes.
4644 But such constructors will never be generated for any possible input.
4646 ALIGN is the alignment of the data in bits.
4648 If REVERSE is true, EXP is output in reverse storage order. */
4650 static unsigned HOST_WIDE_INT
4651 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align,
4654 enum tree_code code;
4655 unsigned HOST_WIDE_INT thissize;
4658 if (size == 0 || flag_syntax_only)
4661 /* See if we're trying to initialize a pointer in a non-default mode
4662 to the address of some declaration somewhere. If the target says
4663 the mode is valid for pointers, assume the target has a way of
4665 if (TREE_CODE (exp) == NOP_EXPR
4666 && POINTER_TYPE_P (TREE_TYPE (exp))
4667 && targetm.addr_space.valid_pointer_mode
4668 (TYPE_MODE (TREE_TYPE (exp)),
4669 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)))))
4671 tree saved_type = TREE_TYPE (exp);
4673 /* Peel off any intermediate conversions-to-pointer for valid
4675 while (TREE_CODE (exp) == NOP_EXPR
4676 && POINTER_TYPE_P (TREE_TYPE (exp))
4677 && targetm.addr_space.valid_pointer_mode
4678 (TYPE_MODE (TREE_TYPE (exp)),
4679 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)))))
4680 exp = TREE_OPERAND (exp, 0);
4682 /* If what we're left with is the address of something, we can
4683 convert the address to the final type and output it that
4685 if (TREE_CODE (exp) == ADDR_EXPR)
4686 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4687 /* Likewise for constant ints. */
4688 else if (TREE_CODE (exp) == INTEGER_CST)
4689 exp = fold_convert (saved_type, exp);
4693 /* Eliminate any conversions since we'll be outputting the underlying
4695 while (CONVERT_EXPR_P (exp)
4696 || TREE_CODE (exp) == NON_LVALUE_EXPR
4697 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4699 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4700 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4702 /* Make sure eliminating the conversion is really a no-op, except with
4703 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4704 union types to allow for Ada unchecked unions. */
4705 if (type_size > op_size
4706 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4707 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4708 /* Keep the conversion. */
4711 exp = TREE_OPERAND (exp, 0);
4714 code = TREE_CODE (TREE_TYPE (exp));
4715 thissize = int_size_in_bytes (TREE_TYPE (exp));
4717 /* Allow a constructor with no elements for any data type.
4718 This means to fill the space with zeros. */
4719 if (TREE_CODE (exp) == CONSTRUCTOR
4720 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp)))
4722 assemble_zeros (size);
4726 if (TREE_CODE (exp) == FDESC_EXPR)
4728 #ifdef ASM_OUTPUT_FDESC
4729 HOST_WIDE_INT part = tree_to_shwi (TREE_OPERAND (exp, 1));
4730 tree decl = TREE_OPERAND (exp, 0);
4731 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4738 /* Now output the underlying data. If we've handling the padding, return.
4739 Otherwise, break and ensure SIZE is the size written. */
4746 case REFERENCE_TYPE:
4748 case FIXED_POINT_TYPE:
4749 case POINTER_BOUNDS_TYPE:
4751 cst = expand_expr (exp, NULL_RTX, VOIDmode, EXPAND_INITIALIZER);
4753 cst = flip_storage_order (TYPE_MODE (TREE_TYPE (exp)), cst);
4754 if (!assemble_integer (cst, MIN (size, thissize), align, 0))
4755 error ("initializer for integer/fixed-point value is too complicated");
4759 if (TREE_CODE (exp) != REAL_CST)
4760 error ("initializer for floating value is not a floating constant");
4762 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)),
4767 output_constant (TREE_REALPART (exp), thissize / 2, align, reverse);
4768 output_constant (TREE_IMAGPART (exp), thissize / 2,
4769 min_align (align, BITS_PER_UNIT * (thissize / 2)),
4775 switch (TREE_CODE (exp))
4778 return output_constructor (exp, size, align, reverse, NULL);
4781 = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp), size);
4782 assemble_string (TREE_STRING_POINTER (exp), thissize);
4786 machine_mode inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4787 unsigned int nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4788 int elt_size = GET_MODE_SIZE (inner);
4789 output_constant (VECTOR_CST_ELT (exp, 0), elt_size, align,
4791 thissize = elt_size;
4792 for (unsigned int i = 1; i < VECTOR_CST_NELTS (exp); i++)
4794 output_constant (VECTOR_CST_ELT (exp, i), elt_size, nalign,
4796 thissize += elt_size;
4807 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4808 return output_constructor (exp, size, align, reverse, NULL);
4817 if (size > thissize)
4818 assemble_zeros (size - thissize);
4823 /* Subroutine of output_constructor, used for computing the size of
4824 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4825 type with an unspecified upper bound. */
4827 static unsigned HOST_WIDE_INT
4828 array_size_for_constructor (tree val)
4831 unsigned HOST_WIDE_INT cnt;
4832 tree index, value, tmp;
4835 /* This code used to attempt to handle string constants that are not
4836 arrays of single-bytes, but nothing else does, so there's no point in
4838 if (TREE_CODE (val) == STRING_CST)
4839 return TREE_STRING_LENGTH (val);
4841 max_index = NULL_TREE;
4842 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4844 if (TREE_CODE (index) == RANGE_EXPR)
4845 index = TREE_OPERAND (index, 1);
4846 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4850 if (max_index == NULL_TREE)
4853 /* Compute the total number of array elements. */
4854 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4855 i = wi::to_offset (max_index) - wi::to_offset (tmp) + 1;
4857 /* Multiply by the array element unit size to find number of bytes. */
4858 i *= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4860 gcc_assert (wi::fits_uhwi_p (i));
4861 return i.to_uhwi ();
4864 /* Other datastructures + helpers for output_constructor. */
4866 /* output_constructor local state to support interaction with helpers. */
4868 struct oc_local_state {
4870 /* Received arguments. */
4871 tree exp; /* Constructor expression. */
4872 tree type; /* Type of constructor expression. */
4873 unsigned HOST_WIDE_INT size; /* # bytes to output - pad if necessary. */
4874 unsigned int align; /* Known initial alignment. */
4875 tree min_index; /* Lower bound if specified for an array. */
4877 /* Output processing state. */
4878 HOST_WIDE_INT total_bytes; /* # bytes output so far / current position. */
4879 int byte; /* Part of a bitfield byte yet to be output. */
4880 int last_relative_index; /* Implicit or explicit index of the last
4881 array element output within a bitfield. */
4882 bool byte_buffer_in_use; /* Whether BYTE is in use. */
4883 bool reverse; /* Whether reverse storage order is in use. */
4885 /* Current element. */
4886 tree field; /* Current field decl in a record. */
4887 tree val; /* Current element value. */
4888 tree index; /* Current element index. */
4892 /* Helper for output_constructor. From the current LOCAL state, output a
4893 RANGE_EXPR element. */
4896 output_constructor_array_range (oc_local_state *local)
4898 unsigned HOST_WIDE_INT fieldsize
4899 = int_size_in_bytes (TREE_TYPE (local->type));
4901 HOST_WIDE_INT lo_index
4902 = tree_to_shwi (TREE_OPERAND (local->index, 0));
4903 HOST_WIDE_INT hi_index
4904 = tree_to_shwi (TREE_OPERAND (local->index, 1));
4905 HOST_WIDE_INT index;
4908 = min_align (local->align, fieldsize * BITS_PER_UNIT);
4910 for (index = lo_index; index <= hi_index; index++)
4912 /* Output the element's initial value. */
4913 if (local->val == NULL_TREE)
4914 assemble_zeros (fieldsize);
4917 = output_constant (local->val, fieldsize, align2, local->reverse);
4919 /* Count its size. */
4920 local->total_bytes += fieldsize;
4924 /* Helper for output_constructor. From the current LOCAL state, output a
4925 field element that is not true bitfield or part of an outer one. */
4928 output_constructor_regular_field (oc_local_state *local)
4930 /* Field size and position. Since this structure is static, we know the
4931 positions are constant. */
4932 unsigned HOST_WIDE_INT fieldsize;
4933 HOST_WIDE_INT fieldpos;
4935 unsigned int align2;
4937 /* Output any buffered-up bit-fields preceding this element. */
4938 if (local->byte_buffer_in_use)
4940 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4941 local->total_bytes++;
4942 local->byte_buffer_in_use = false;
4945 if (local->index != NULL_TREE)
4947 /* Perform the index calculation in modulo arithmetic but
4948 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4949 but we are using an unsigned sizetype. */
4950 unsigned prec = TYPE_PRECISION (sizetype);
4951 offset_int idx = wi::sext (wi::to_offset (local->index)
4952 - wi::to_offset (local->min_index), prec);
4953 fieldpos = (idx * wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local->val))))
4956 else if (local->field != NULL_TREE)
4957 fieldpos = int_byte_position (local->field);
4961 /* Advance to offset of this element.
4962 Note no alignment needed in an array, since that is guaranteed
4963 if each element has the proper size. */
4964 if (local->field != NULL_TREE || local->index != NULL_TREE)
4966 if (fieldpos > local->total_bytes)
4968 assemble_zeros (fieldpos - local->total_bytes);
4969 local->total_bytes = fieldpos;
4972 /* Must not go backwards. */
4973 gcc_assert (fieldpos == local->total_bytes);
4976 /* Find the alignment of this element. */
4977 align2 = min_align (local->align, BITS_PER_UNIT * fieldpos);
4979 /* Determine size this element should occupy. */
4984 /* If this is an array with an unspecified upper bound,
4985 the initializer determines the size. */
4986 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4987 but we cannot do this until the deprecated support for
4988 initializing zero-length array members is removed. */
4989 if (TREE_CODE (TREE_TYPE (local->field)) == ARRAY_TYPE
4990 && (!TYPE_DOMAIN (TREE_TYPE (local->field))
4991 || !TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local->field)))))
4993 fieldsize = array_size_for_constructor (local->val);
4994 /* Given a non-empty initialization, this field had better
4995 be last. Given a flexible array member, the next field
4996 on the chain is a TYPE_DECL of the enclosing struct. */
4997 const_tree next = DECL_CHAIN (local->field);
4998 gcc_assert (!fieldsize || !next || TREE_CODE (next) != FIELD_DECL);
5001 fieldsize = tree_to_uhwi (DECL_SIZE_UNIT (local->field));
5004 fieldsize = int_size_in_bytes (TREE_TYPE (local->type));
5006 /* Output the element's initial value. */
5007 if (local->val == NULL_TREE)
5008 assemble_zeros (fieldsize);
5011 = output_constant (local->val, fieldsize, align2, local->reverse);
5013 /* Count its size. */
5014 local->total_bytes += fieldsize;
5017 /* Helper for output_constructor. From the LOCAL state, output an element
5018 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5019 from the start of a possibly ongoing outer byte buffer. */
5022 output_constructor_bitfield (oc_local_state *local, unsigned int bit_offset)
5024 /* Bit size of this element. */
5025 HOST_WIDE_INT ebitsize
5027 ? tree_to_uhwi (DECL_SIZE (local->field))
5028 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local->type))));
5030 /* Relative index of this element if this is an array component. */
5031 HOST_WIDE_INT relative_index
5034 ? (tree_to_shwi (local->index)
5035 - tree_to_shwi (local->min_index))
5036 : local->last_relative_index + 1)
5039 /* Bit position of this element from the start of the containing
5041 HOST_WIDE_INT constructor_relative_ebitpos
5043 ? int_bit_position (local->field)
5044 : ebitsize * relative_index);
5046 /* Bit position of this element from the start of a possibly ongoing
5047 outer byte buffer. */
5048 HOST_WIDE_INT byte_relative_ebitpos
5049 = bit_offset + constructor_relative_ebitpos;
5051 /* From the start of a possibly ongoing outer byte buffer, offsets to
5052 the first bit of this element and to the first bit past the end of
5054 HOST_WIDE_INT next_offset = byte_relative_ebitpos;
5055 HOST_WIDE_INT end_offset = byte_relative_ebitpos + ebitsize;
5057 local->last_relative_index = relative_index;
5059 if (local->val == NULL_TREE)
5060 local->val = integer_zero_node;
5062 while (TREE_CODE (local->val) == VIEW_CONVERT_EXPR
5063 || TREE_CODE (local->val) == NON_LVALUE_EXPR)
5064 local->val = TREE_OPERAND (local->val, 0);
5066 if (TREE_CODE (local->val) != INTEGER_CST
5067 && TREE_CODE (local->val) != CONSTRUCTOR)
5069 error ("invalid initial value for member %qE", DECL_NAME (local->field));
5073 /* If this field does not start in this (or next) byte, skip some bytes. */
5074 if (next_offset / BITS_PER_UNIT != local->total_bytes)
5076 /* Output remnant of any bit field in previous bytes. */
5077 if (local->byte_buffer_in_use)
5079 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
5080 local->total_bytes++;
5081 local->byte_buffer_in_use = false;
5084 /* If still not at proper byte, advance to there. */
5085 if (next_offset / BITS_PER_UNIT != local->total_bytes)
5087 gcc_assert (next_offset / BITS_PER_UNIT >= local->total_bytes);
5088 assemble_zeros (next_offset / BITS_PER_UNIT - local->total_bytes);
5089 local->total_bytes = next_offset / BITS_PER_UNIT;
5093 /* Set up the buffer if necessary. */
5094 if (!local->byte_buffer_in_use)
5098 local->byte_buffer_in_use = true;
5101 /* If this is nested constructor, recurse passing the bit offset and the
5102 pending data, then retrieve the new pending data afterwards. */
5103 if (TREE_CODE (local->val) == CONSTRUCTOR)
5105 oc_outer_state temp_state;
5106 temp_state.bit_offset = next_offset % BITS_PER_UNIT;
5107 temp_state.byte = local->byte;
5109 += output_constructor (local->val, 0, 0, local->reverse, &temp_state);
5110 local->byte = temp_state.byte;
5114 /* Otherwise, we must split the element into pieces that fall within
5115 separate bytes, and combine each byte with previous or following
5117 while (next_offset < end_offset)
5121 HOST_WIDE_INT value;
5122 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
5123 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
5125 /* Advance from byte to byte within this element when necessary. */
5126 while (next_byte != local->total_bytes)
5128 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
5129 local->total_bytes++;
5133 /* Number of bits we can process at once (all part of the same byte). */
5134 this_time = MIN (end_offset - next_offset, BITS_PER_UNIT - next_bit);
5135 if (local->reverse ? !BYTES_BIG_ENDIAN : BYTES_BIG_ENDIAN)
5137 /* For big-endian data, take the most significant bits (of the
5138 bits that are significant) first and put them into bytes from
5139 the most significant end. */
5140 shift = end_offset - next_offset - this_time;
5142 /* Don't try to take a bunch of bits that cross
5143 the word boundary in the INTEGER_CST. We can
5144 only select bits from one element. */
5145 if ((shift / HOST_BITS_PER_WIDE_INT)
5146 != ((shift + this_time - 1) / HOST_BITS_PER_WIDE_INT))
5148 const int end = shift + this_time - 1;
5149 shift = end & -HOST_BITS_PER_WIDE_INT;
5150 this_time = end - shift + 1;
5153 /* Now get the bits from the appropriate constant word. */
5154 value = TREE_INT_CST_ELT (local->val, shift / HOST_BITS_PER_WIDE_INT);
5155 shift = shift & (HOST_BITS_PER_WIDE_INT - 1);
5157 /* Get the result. This works only when:
5158 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5159 local->byte |= (((value >> shift)
5160 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
5161 << (BITS_PER_UNIT - this_time - next_bit));
5165 /* On little-endian machines, take the least significant bits of
5166 the value first and pack them starting at the least significant
5167 bits of the bytes. */
5168 shift = next_offset - byte_relative_ebitpos;
5170 /* Don't try to take a bunch of bits that cross
5171 the word boundary in the INTEGER_CST. We can
5172 only select bits from one element. */
5173 if ((shift / HOST_BITS_PER_WIDE_INT)
5174 != ((shift + this_time - 1) / HOST_BITS_PER_WIDE_INT))
5176 = HOST_BITS_PER_WIDE_INT - (shift & (HOST_BITS_PER_WIDE_INT - 1));
5178 /* Now get the bits from the appropriate constant word. */
5179 value = TREE_INT_CST_ELT (local->val, shift / HOST_BITS_PER_WIDE_INT);
5180 shift = shift & (HOST_BITS_PER_WIDE_INT - 1);
5182 /* Get the result. This works only when:
5183 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5184 local->byte |= (((value >> shift)
5185 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
5189 next_offset += this_time;
5190 local->byte_buffer_in_use = true;
5194 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5195 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5196 caller output state of relevance in recursive invocations. */
5198 static unsigned HOST_WIDE_INT
5199 output_constructor (tree exp, unsigned HOST_WIDE_INT size, unsigned int align,
5200 bool reverse, oc_outer_state *outer)
5202 unsigned HOST_WIDE_INT cnt;
5203 constructor_elt *ce;
5204 oc_local_state local;
5206 /* Setup our local state to communicate with helpers. */
5208 local.type = TREE_TYPE (exp);
5210 local.align = align;
5211 if (TREE_CODE (local.type) == ARRAY_TYPE && TYPE_DOMAIN (local.type))
5212 local.min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (local.type));
5214 local.min_index = integer_zero_node;
5216 local.total_bytes = 0;
5217 local.byte_buffer_in_use = outer != NULL;
5218 local.byte = outer ? outer->byte : 0;
5219 local.last_relative_index = -1;
5220 /* The storage order is specified for every aggregate type. */
5221 if (AGGREGATE_TYPE_P (local.type))
5222 local.reverse = TYPE_REVERSE_STORAGE_ORDER (local.type);
5224 local.reverse = reverse;
5226 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
5228 /* As CE goes through the elements of the constant, FIELD goes through the
5229 structure fields if the constant is a structure. If the constant is a
5230 union, we override this by getting the field from the TREE_LIST element.
5231 But the constant could also be an array. Then FIELD is zero.
5233 There is always a maximum of one element in the chain LINK for unions
5234 (even if the initializer in a source program incorrectly contains
5237 if (TREE_CODE (local.type) == RECORD_TYPE)
5238 local.field = TYPE_FIELDS (local.type);
5240 local.field = NULL_TREE;
5243 vec_safe_iterate (CONSTRUCTOR_ELTS (exp), cnt, &ce);
5244 cnt++, local.field = local.field ? DECL_CHAIN (local.field) : 0)
5246 local.val = ce->value;
5247 local.index = NULL_TREE;
5249 /* The element in a union constructor specifies the proper field
5251 if (RECORD_OR_UNION_TYPE_P (local.type) && ce->index != NULL_TREE)
5252 local.field = ce->index;
5254 else if (TREE_CODE (local.type) == ARRAY_TYPE)
5255 local.index = ce->index;
5257 if (local.field && flag_verbose_asm)
5258 fprintf (asm_out_file, "%s %s:\n",
5260 DECL_NAME (local.field)
5261 ? IDENTIFIER_POINTER (DECL_NAME (local.field))
5264 /* Eliminate the marker that makes a cast not be an lvalue. */
5265 if (local.val != NULL_TREE)
5266 STRIP_NOPS (local.val);
5268 /* Output the current element, using the appropriate helper ... */
5270 /* For an array slice not part of an outer bitfield. */
5272 && local.index != NULL_TREE
5273 && TREE_CODE (local.index) == RANGE_EXPR)
5274 output_constructor_array_range (&local);
5276 /* For a field that is neither a true bitfield nor part of an outer one,
5277 known to be at least byte aligned and multiple-of-bytes long. */
5279 && (local.field == NULL_TREE
5280 || !CONSTRUCTOR_BITFIELD_P (local.field)))
5281 output_constructor_regular_field (&local);
5283 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5284 supported for scalar fields, so we may need to convert first. */
5287 if (TREE_CODE (local.val) == REAL_CST)
5289 = fold_unary (VIEW_CONVERT_EXPR,
5290 build_nonstandard_integer_type
5291 (TYPE_PRECISION (TREE_TYPE (local.val)), 0),
5293 output_constructor_bitfield (&local, outer ? outer->bit_offset : 0);
5297 /* If we are not at toplevel, save the pending data for our caller.
5298 Otherwise output the pending data and padding zeros as needed. */
5300 outer->byte = local.byte;
5303 if (local.byte_buffer_in_use)
5305 assemble_integer (GEN_INT (local.byte), 1, BITS_PER_UNIT, 1);
5306 local.total_bytes++;
5309 if ((unsigned HOST_WIDE_INT)local.total_bytes < local.size)
5311 assemble_zeros (local.size - local.total_bytes);
5312 local.total_bytes = local.size;
5316 return local.total_bytes;
5319 /* Mark DECL as weak. */
5322 mark_weak (tree decl)
5324 if (DECL_WEAK (decl))
5327 struct symtab_node *n = symtab_node::get (decl);
5328 if (n && n->refuse_visibility_changes)
5329 error ("%+D declared weak after being used", decl);
5330 DECL_WEAK (decl) = 1;
5332 if (DECL_RTL_SET_P (decl)
5333 && MEM_P (DECL_RTL (decl))
5334 && XEXP (DECL_RTL (decl), 0)
5335 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
5336 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
5339 /* Merge weak status between NEWDECL and OLDDECL. */
5342 merge_weak (tree newdecl, tree olddecl)
5344 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
5346 if (DECL_WEAK (newdecl) && TARGET_SUPPORTS_WEAK)
5349 /* We put the NEWDECL on the weak_decls list at some point
5350 and OLDDECL as well. Keep just OLDDECL on the list. */
5351 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
5352 if (TREE_VALUE (*pwd) == newdecl)
5354 *pwd = TREE_CHAIN (*pwd);
5361 if (DECL_WEAK (newdecl))
5365 /* NEWDECL is weak, but OLDDECL is not. */
5367 /* If we already output the OLDDECL, we're in trouble; we can't
5368 go back and make it weak. This should never happen in
5369 unit-at-a-time compilation. */
5370 gcc_assert (!TREE_ASM_WRITTEN (olddecl));
5372 /* If we've already generated rtl referencing OLDDECL, we may
5373 have done so in a way that will not function properly with
5374 a weak symbol. Again in unit-at-a-time this should be
5376 gcc_assert (!TREE_USED (olddecl)
5377 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)));
5379 if (TARGET_SUPPORTS_WEAK)
5381 /* We put the NEWDECL on the weak_decls list at some point.
5382 Replace it with the OLDDECL. */
5383 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
5384 if (TREE_VALUE (wd) == newdecl)
5386 TREE_VALUE (wd) = olddecl;
5389 /* We may not find the entry on the list. If NEWDECL is a
5390 weak alias, then we will have already called
5391 globalize_decl to remove the entry; in that case, we do
5392 not need to do anything. */
5395 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5396 mark_weak (olddecl);
5399 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5400 weak. Just update NEWDECL to indicate that it's weak too. */
5401 mark_weak (newdecl);
5404 /* Declare DECL to be a weak symbol. */
5407 declare_weak (tree decl)
5409 gcc_assert (TREE_CODE (decl) != FUNCTION_DECL || !TREE_ASM_WRITTEN (decl));
5410 if (! TREE_PUBLIC (decl))
5412 error ("weak declaration of %q+D must be public", decl);
5415 else if (!TARGET_SUPPORTS_WEAK)
5416 warning (0, "weak declaration of %q+D not supported", decl);
5419 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl)))
5420 DECL_ATTRIBUTES (decl)
5421 = tree_cons (get_identifier ("weak"), NULL, DECL_ATTRIBUTES (decl));
5425 weak_finish_1 (tree decl)
5427 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5428 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5431 if (! TREE_USED (decl))
5434 #ifdef ASM_WEAKEN_DECL
5435 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
5437 #ifdef ASM_WEAKEN_LABEL
5438 ASM_WEAKEN_LABEL (asm_out_file, name);
5440 #ifdef ASM_OUTPUT_WEAK_ALIAS
5442 static bool warn_once = 0;
5445 warning (0, "only weak aliases are supported in this configuration");
5455 /* Fiven an assembly name, find the decl it is associated with. */
5457 find_decl (tree target)
5459 symtab_node *node = symtab_node::get_for_asmname (target);
5465 /* This TREE_LIST contains weakref targets. */
5467 static GTY(()) tree weakref_targets;
5469 /* Emit any pending weak declarations. */
5476 for (t = weakref_targets; t; t = TREE_CHAIN (t))
5478 tree alias_decl = TREE_PURPOSE (t);
5479 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
5481 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
5482 /* Remove alias_decl from the weak list, but leave entries for
5483 the target alone. */
5485 #ifndef ASM_OUTPUT_WEAKREF
5486 else if (! TREE_SYMBOL_REFERENCED (target))
5488 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5489 defined, otherwise we and weak_finish_1 would use
5490 different macros. */
5491 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5492 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
5494 tree decl = find_decl (target);
5498 decl = build_decl (DECL_SOURCE_LOCATION (alias_decl),
5499 TREE_CODE (alias_decl), target,
5500 TREE_TYPE (alias_decl));
5502 DECL_EXTERNAL (decl) = 1;
5503 TREE_PUBLIC (decl) = 1;
5504 DECL_ARTIFICIAL (decl) = 1;
5505 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
5506 TREE_USED (decl) = 1;
5509 weak_finish_1 (decl);
5518 /* Remove the alias and the target from the pending weak list
5519 so that we do not emit any .weak directives for the former,
5520 nor multiple .weak directives for the latter. */
5521 for (p = &weak_decls; (t2 = *p) ; )
5523 if (TREE_VALUE (t2) == alias_decl
5524 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
5525 *p = TREE_CHAIN (t2);
5527 p = &TREE_CHAIN (t2);
5530 /* Remove other weakrefs to the same target, to speed things up. */
5531 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
5533 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
5534 *p = TREE_CHAIN (t2);
5536 p = &TREE_CHAIN (t2);
5541 for (t = weak_decls; t; t = TREE_CHAIN (t))
5543 tree decl = TREE_VALUE (t);
5545 weak_finish_1 (decl);
5549 /* Emit the assembly bits to indicate that DECL is globally visible. */
5552 globalize_decl (tree decl)
5555 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5556 if (DECL_WEAK (decl))
5558 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
5561 #ifdef ASM_WEAKEN_DECL
5562 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
5564 ASM_WEAKEN_LABEL (asm_out_file, name);
5567 /* Remove this function from the pending weak list so that
5568 we do not emit multiple .weak directives for it. */
5569 for (p = &weak_decls; (t = *p) ; )
5571 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5572 *p = TREE_CHAIN (t);
5574 p = &TREE_CHAIN (t);
5577 /* Remove weakrefs to the same target from the pending weakref
5578 list, for the same reason. */
5579 for (p = &weakref_targets; (t = *p) ; )
5581 if (DECL_ASSEMBLER_NAME (decl)
5582 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5583 *p = TREE_CHAIN (t);
5585 p = &TREE_CHAIN (t);
5592 targetm.asm_out.globalize_decl_name (asm_out_file, decl);
5595 vec<alias_pair, va_gc> *alias_pairs;
5597 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5598 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5599 tree node is DECL to have the value of the tree node TARGET. */
5602 do_assemble_alias (tree decl, tree target)
5606 /* Emulated TLS had better not get this var. */
5607 gcc_assert (!(!targetm.have_tls
5608 && TREE_CODE (decl) == VAR_DECL
5609 && DECL_THREAD_LOCAL_P (decl)));
5611 if (TREE_ASM_WRITTEN (decl))
5614 id = DECL_ASSEMBLER_NAME (decl);
5615 ultimate_transparent_alias_target (&id);
5616 ultimate_transparent_alias_target (&target);
5618 /* We must force creation of DECL_RTL for debug info generation, even though
5619 we don't use it here. */
5620 make_decl_rtl (decl);
5622 TREE_ASM_WRITTEN (decl) = 1;
5623 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
5624 TREE_ASM_WRITTEN (id) = 1;
5626 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5628 if (!TREE_SYMBOL_REFERENCED (target))
5629 weakref_targets = tree_cons (decl, target, weakref_targets);
5631 #ifdef ASM_OUTPUT_WEAKREF
5632 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
5633 IDENTIFIER_POINTER (id),
5634 IDENTIFIER_POINTER (target));
5636 if (!TARGET_SUPPORTS_WEAK)
5638 error_at (DECL_SOURCE_LOCATION (decl),
5639 "weakref is not supported in this configuration");
5646 #ifdef ASM_OUTPUT_DEF
5647 tree orig_decl = decl;
5649 if (TREE_CODE (decl) == FUNCTION_DECL
5650 && cgraph_node::get (decl)->instrumentation_clone
5651 && cgraph_node::get (decl)->instrumented_version)
5652 orig_decl = cgraph_node::get (decl)->instrumented_version->decl;
5654 /* Make name accessible from other files, if appropriate. */
5656 if (TREE_PUBLIC (decl) || TREE_PUBLIC (orig_decl))
5658 globalize_decl (decl);
5659 maybe_assemble_visibility (decl);
5661 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl)))
5663 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5664 if (targetm.has_ifunc_p ())
5665 ASM_OUTPUT_TYPE_DIRECTIVE
5666 (asm_out_file, IDENTIFIER_POINTER (id),
5670 error_at (DECL_SOURCE_LOCATION (decl),
5671 "ifunc is not supported on this target");
5674 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5675 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
5677 ASM_OUTPUT_DEF (asm_out_file,
5678 IDENTIFIER_POINTER (id),
5679 IDENTIFIER_POINTER (target));
5681 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5686 name = IDENTIFIER_POINTER (id);
5687 # ifdef ASM_WEAKEN_DECL
5688 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
5690 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
5692 /* Remove this function from the pending weak list so that
5693 we do not emit multiple .weak directives for it. */
5694 for (p = &weak_decls; (t = *p) ; )
5695 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t))
5696 || id == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5697 *p = TREE_CHAIN (t);
5699 p = &TREE_CHAIN (t);
5701 /* Remove weakrefs to the same target from the pending weakref
5702 list, for the same reason. */
5703 for (p = &weakref_targets; (t = *p) ; )
5705 if (id == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5706 *p = TREE_CHAIN (t);
5708 p = &TREE_CHAIN (t);
5714 /* Emit an assembler directive to make the symbol for DECL an alias to
5715 the symbol for TARGET. */
5718 assemble_alias (tree decl, tree target)
5722 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5724 tree alias = DECL_ASSEMBLER_NAME (decl);
5726 ultimate_transparent_alias_target (&target);
5728 if (alias == target)
5729 error ("weakref %q+D ultimately targets itself", decl);
5730 if (TREE_PUBLIC (decl))
5731 error ("weakref %q+D must have static linkage", decl);
5735 #if !defined (ASM_OUTPUT_DEF)
5736 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5737 error_at (DECL_SOURCE_LOCATION (decl),
5738 "alias definitions not supported in this configuration");
5739 TREE_ASM_WRITTEN (decl) = 1;
5742 if (!DECL_WEAK (decl))
5744 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl)))
5745 error_at (DECL_SOURCE_LOCATION (decl),
5746 "ifunc is not supported in this configuration");
5748 error_at (DECL_SOURCE_LOCATION (decl),
5749 "only weak aliases are supported in this configuration");
5750 TREE_ASM_WRITTEN (decl) = 1;
5756 TREE_USED (decl) = 1;
5758 /* Allow aliases to aliases. */
5759 if (TREE_CODE (decl) == FUNCTION_DECL)
5760 cgraph_node::get_create (decl)->alias = true;
5762 varpool_node::get_create (decl)->alias = true;
5764 /* If the target has already been emitted, we don't have to queue the
5765 alias. This saves a tad of memory. */
5766 if (symtab->global_info_ready)
5767 target_decl = find_decl (target);
5770 if ((target_decl && TREE_ASM_WRITTEN (target_decl))
5771 || symtab->state >= EXPANSION)
5772 do_assemble_alias (decl, target);
5775 alias_pair p = {decl, target};
5776 vec_safe_push (alias_pairs, p);
5780 /* Record and output a table of translations from original function
5781 to its transaction aware clone. Note that tm_pure functions are
5782 considered to be their own clone. */
5784 struct tm_clone_hasher : ggc_cache_ptr_hash<tree_map>
5786 static hashval_t hash (tree_map *m) { return tree_map_hash (m); }
5787 static bool equal (tree_map *a, tree_map *b) { return tree_map_eq (a, b); }
5790 keep_cache_entry (tree_map *&e)
5792 return ggc_marked_p (e->base.from);
5796 static GTY((cache)) hash_table<tm_clone_hasher> *tm_clone_hash;
5799 record_tm_clone_pair (tree o, tree n)
5801 struct tree_map **slot, *h;
5803 if (tm_clone_hash == NULL)
5804 tm_clone_hash = hash_table<tm_clone_hasher>::create_ggc (32);
5806 h = ggc_alloc<tree_map> ();
5807 h->hash = htab_hash_pointer (o);
5811 slot = tm_clone_hash->find_slot_with_hash (h, h->hash, INSERT);
5816 get_tm_clone_pair (tree o)
5820 struct tree_map *h, in;
5823 in.hash = htab_hash_pointer (o);
5824 h = tm_clone_hash->find_with_hash (&in, in.hash);
5831 struct tm_alias_pair
5839 /* Dump the actual pairs to the .tm_clone_table section. */
5842 dump_tm_clone_pairs (vec<tm_alias_pair> tm_alias_pairs)
5846 bool switched = false;
5848 FOR_EACH_VEC_ELT (tm_alias_pairs, i, p)
5852 struct cgraph_node *src_n = cgraph_node::get (src);
5853 struct cgraph_node *dst_n = cgraph_node::get (dst);
5855 /* The function ipa_tm_create_version() marks the clone as needed if
5856 the original function was needed. But we also mark the clone as
5857 needed if we ever called the clone indirectly through
5858 TM_GETTMCLONE. If neither of these are true, we didn't generate
5859 a clone, and we didn't call it indirectly... no sense keeping it
5860 in the clone table. */
5861 if (!dst_n || !dst_n->definition)
5864 /* This covers the case where we have optimized the original
5865 function away, and only access the transactional clone. */
5866 if (!src_n || !src_n->definition)
5871 switch_to_section (targetm.asm_out.tm_clone_table_section ());
5872 assemble_align (POINTER_SIZE);
5876 assemble_integer (XEXP (DECL_RTL (src), 0),
5877 POINTER_SIZE_UNITS, POINTER_SIZE, 1);
5878 assemble_integer (XEXP (DECL_RTL (dst), 0),
5879 POINTER_SIZE_UNITS, POINTER_SIZE, 1);
5883 /* Provide a default for the tm_clone_table section. */
5886 default_clone_table_section (void)
5888 return get_named_section (NULL, ".tm_clone_table", 3);
5891 /* Helper comparison function for qsorting by the DECL_UID stored in
5892 alias_pair->emitted_diags. */
5895 tm_alias_pair_cmp (const void *x, const void *y)
5897 const tm_alias_pair *p1 = (const tm_alias_pair *) x;
5898 const tm_alias_pair *p2 = (const tm_alias_pair *) y;
5899 if (p1->uid < p2->uid)
5901 if (p1->uid > p2->uid)
5907 finish_tm_clone_pairs (void)
5909 vec<tm_alias_pair> tm_alias_pairs = vNULL;
5911 if (tm_clone_hash == NULL)
5914 /* We need a determenistic order for the .tm_clone_table, otherwise
5915 we will get bootstrap comparison failures, so dump the hash table
5916 to a vector, sort it, and dump the vector. */
5918 /* Dump the hashtable to a vector. */
5920 hash_table<tm_clone_hasher>::iterator iter;
5921 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash, map, tree_map *, iter)
5923 tm_alias_pair p = {DECL_UID (map->base.from), map->base.from, map->to};
5924 tm_alias_pairs.safe_push (p);
5927 tm_alias_pairs.qsort (tm_alias_pair_cmp);
5930 dump_tm_clone_pairs (tm_alias_pairs);
5932 tm_clone_hash->empty ();
5933 tm_clone_hash = NULL;
5934 tm_alias_pairs.release ();
5938 /* Emit an assembler directive to set symbol for DECL visibility to
5939 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5942 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED,
5943 int vis ATTRIBUTE_UNUSED)
5945 #ifdef HAVE_GAS_HIDDEN
5946 static const char * const visibility_types[] = {
5947 NULL, "protected", "hidden", "internal"
5950 const char *name, *type;
5953 id = DECL_ASSEMBLER_NAME (decl);
5954 ultimate_transparent_alias_target (&id);
5955 name = IDENTIFIER_POINTER (id);
5957 type = visibility_types[vis];
5959 fprintf (asm_out_file, "\t.%s\t", type);
5960 assemble_name (asm_out_file, name);
5961 fprintf (asm_out_file, "\n");
5963 if (!DECL_ARTIFICIAL (decl))
5964 warning (OPT_Wattributes, "visibility attribute not supported "
5965 "in this configuration; ignored");
5969 /* A helper function to call assemble_visibility when needed for a decl. */
5972 maybe_assemble_visibility (tree decl)
5974 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5976 if (TREE_CODE (decl) == FUNCTION_DECL
5977 && cgraph_node::get (decl)
5978 && cgraph_node::get (decl)->instrumentation_clone
5979 && cgraph_node::get (decl)->instrumented_version)
5980 vis = DECL_VISIBILITY (cgraph_node::get (decl)->instrumented_version->decl);
5982 if (vis != VISIBILITY_DEFAULT)
5984 targetm.asm_out.assemble_visibility (decl, vis);
5991 /* Returns 1 if the target configuration supports defining public symbols
5992 so that one of them will be chosen at link time instead of generating a
5993 multiply-defined symbol error, whether through the use of weak symbols or
5994 a target-specific mechanism for having duplicates discarded. */
5997 supports_one_only (void)
5999 if (SUPPORTS_ONE_ONLY)
6001 return TARGET_SUPPORTS_WEAK;
6004 /* Set up DECL as a public symbol that can be defined in multiple
6005 translation units without generating a linker error. */
6008 make_decl_one_only (tree decl, tree comdat_group)
6010 struct symtab_node *symbol;
6011 gcc_assert (TREE_CODE (decl) == VAR_DECL
6012 || TREE_CODE (decl) == FUNCTION_DECL);
6014 TREE_PUBLIC (decl) = 1;
6016 if (TREE_CODE (decl) == VAR_DECL)
6017 symbol = varpool_node::get_create (decl);
6019 symbol = cgraph_node::get_create (decl);
6021 if (SUPPORTS_ONE_ONLY)
6023 #ifdef MAKE_DECL_ONE_ONLY
6024 MAKE_DECL_ONE_ONLY (decl);
6026 symbol->set_comdat_group (comdat_group);
6028 else if (TREE_CODE (decl) == VAR_DECL
6029 && (DECL_INITIAL (decl) == 0
6030 || (!in_lto_p && DECL_INITIAL (decl) == error_mark_node)))
6031 DECL_COMMON (decl) = 1;
6034 gcc_assert (TARGET_SUPPORTS_WEAK);
6035 DECL_WEAK (decl) = 1;
6040 init_varasm_once (void)
6042 section_htab = hash_table<section_hasher>::create_ggc (31);
6043 object_block_htab = hash_table<object_block_hasher>::create_ggc (31);
6044 const_desc_htab = hash_table<tree_descriptor_hasher>::create_ggc (1009);
6046 shared_constant_pool = create_constant_pool ();
6048 #ifdef TEXT_SECTION_ASM_OP
6049 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
6050 TEXT_SECTION_ASM_OP);
6053 #ifdef DATA_SECTION_ASM_OP
6054 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
6055 DATA_SECTION_ASM_OP);
6058 #ifdef SDATA_SECTION_ASM_OP
6059 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
6060 SDATA_SECTION_ASM_OP);
6063 #ifdef READONLY_DATA_SECTION_ASM_OP
6064 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
6065 READONLY_DATA_SECTION_ASM_OP);
6068 #ifdef CTORS_SECTION_ASM_OP
6069 ctors_section = get_unnamed_section (0, output_section_asm_op,
6070 CTORS_SECTION_ASM_OP);
6073 #ifdef DTORS_SECTION_ASM_OP
6074 dtors_section = get_unnamed_section (0, output_section_asm_op,
6075 DTORS_SECTION_ASM_OP);
6078 #ifdef BSS_SECTION_ASM_OP
6079 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
6080 output_section_asm_op,
6081 BSS_SECTION_ASM_OP);
6084 #ifdef SBSS_SECTION_ASM_OP
6085 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
6086 output_section_asm_op,
6087 SBSS_SECTION_ASM_OP);
6090 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6091 | SECTION_COMMON, emit_tls_common);
6092 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6093 | SECTION_COMMON, emit_local);
6094 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6095 | SECTION_COMMON, emit_common);
6097 #if defined ASM_OUTPUT_ALIGNED_BSS
6098 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
6102 targetm.asm_out.init_sections ();
6104 if (readonly_data_section == NULL)
6105 readonly_data_section = text_section;
6107 #ifdef ASM_OUTPUT_EXTERNAL
6108 pending_assemble_externals_set = new hash_set<tree>;
6113 decl_default_tls_model (const_tree decl)
6115 enum tls_model kind;
6118 is_local = targetm.binds_local_p (decl);
6122 kind = TLS_MODEL_LOCAL_EXEC;
6124 kind = TLS_MODEL_INITIAL_EXEC;
6127 /* Local dynamic is inefficient when we're not combining the
6128 parts of the address. */
6129 else if (optimize && is_local)
6130 kind = TLS_MODEL_LOCAL_DYNAMIC;
6132 kind = TLS_MODEL_GLOBAL_DYNAMIC;
6133 if (kind < flag_tls_default)
6134 kind = flag_tls_default;
6139 /* Select a set of attributes for section NAME based on the properties
6140 of DECL and whether or not RELOC indicates that DECL's initializer
6141 might contain runtime relocations.
6143 We make the section read-only and executable for a function decl,
6144 read-only for a const data decl, and writable for a non-const data decl. */
6147 default_section_type_flags (tree decl, const char *name, int reloc)
6151 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
6152 flags = SECTION_CODE;
6155 enum section_category category
6156 = categorize_decl_for_section (decl, reloc);
6157 if (decl_readonly_section_1 (category))
6159 else if (category == SECCAT_DATA_REL_RO
6160 || category == SECCAT_DATA_REL_RO_LOCAL)
6161 flags = SECTION_WRITE | SECTION_RELRO;
6163 flags = SECTION_WRITE;
6167 flags = SECTION_WRITE;
6168 if (strcmp (name, ".data.rel.ro") == 0
6169 || strcmp (name, ".data.rel.ro.local") == 0)
6170 flags |= SECTION_RELRO;
6173 if (decl && DECL_P (decl) && DECL_COMDAT_GROUP (decl))
6174 flags |= SECTION_LINKONCE;
6176 if (strcmp (name, ".vtable_map_vars") == 0)
6177 flags |= SECTION_LINKONCE;
6179 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
6180 flags |= SECTION_TLS | SECTION_WRITE;
6182 if (strcmp (name, ".bss") == 0
6183 || strncmp (name, ".bss.", 5) == 0
6184 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
6185 || strcmp (name, ".persistent.bss") == 0
6186 || strcmp (name, ".sbss") == 0
6187 || strncmp (name, ".sbss.", 6) == 0
6188 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
6189 flags |= SECTION_BSS;
6191 if (strcmp (name, ".tdata") == 0
6192 || strncmp (name, ".tdata.", 7) == 0
6193 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
6194 flags |= SECTION_TLS;
6196 if (strcmp (name, ".tbss") == 0
6197 || strncmp (name, ".tbss.", 6) == 0
6198 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
6199 flags |= SECTION_TLS | SECTION_BSS;
6201 /* These three sections have special ELF types. They are neither
6202 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6203 want to print a section type (@progbits or @nobits). If someone
6204 is silly enough to emit code or TLS variables to one of these
6205 sections, then don't handle them specially. */
6206 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
6207 && (strcmp (name, ".init_array") == 0
6208 || strcmp (name, ".fini_array") == 0
6209 || strcmp (name, ".preinit_array") == 0))
6210 flags |= SECTION_NOTYPE;
6215 /* Return true if the target supports some form of global BSS,
6216 either through bss_noswitch_section, or by selecting a BSS
6217 section in TARGET_ASM_SELECT_SECTION. */
6220 have_global_bss_p (void)
6222 return bss_noswitch_section || targetm.have_switchable_bss_sections;
6225 /* Output assembly to switch to section NAME with attribute FLAGS.
6226 Four variants for common object file formats. */
6229 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
6230 unsigned int flags ATTRIBUTE_UNUSED,
6231 tree decl ATTRIBUTE_UNUSED)
6233 /* Some object formats don't support named sections at all. The
6234 front-end should already have flagged this as an error. */
6238 #ifndef TLS_SECTION_ASM_FLAG
6239 #define TLS_SECTION_ASM_FLAG 'T'
6243 default_elf_asm_named_section (const char *name, unsigned int flags,
6246 char flagchars[10], *f = flagchars;
6248 /* If we have already declared this section, we can use an
6249 abbreviated form to switch back to it -- unless this section is
6250 part of a COMDAT groups, in which case GAS requires the full
6251 declaration every time. */
6252 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6253 && (flags & SECTION_DECLARED))
6255 fprintf (asm_out_file, "\t.section\t%s\n", name);
6259 if (!(flags & SECTION_DEBUG))
6261 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6262 if (flags & SECTION_EXCLUDE)
6265 if (flags & SECTION_WRITE)
6267 if (flags & SECTION_CODE)
6269 if (flags & SECTION_SMALL)
6271 if (flags & SECTION_MERGE)
6273 if (flags & SECTION_STRINGS)
6275 if (flags & SECTION_TLS)
6276 *f++ = TLS_SECTION_ASM_FLAG;
6277 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6281 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
6283 if (!(flags & SECTION_NOTYPE))
6288 if (flags & SECTION_BSS)
6294 /* On platforms that use "@" as the assembly comment character,
6296 if (strcmp (ASM_COMMENT_START, "@") == 0)
6298 fprintf (asm_out_file, format, type);
6300 if (flags & SECTION_ENTSIZE)
6301 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
6302 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6304 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6305 fprintf (asm_out_file, ",%s,comdat", IDENTIFIER_POINTER (decl));
6307 fprintf (asm_out_file, ",%s,comdat",
6308 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl)));
6312 putc ('\n', asm_out_file);
6316 default_coff_asm_named_section (const char *name, unsigned int flags,
6317 tree decl ATTRIBUTE_UNUSED)
6319 char flagchars[8], *f = flagchars;
6321 if (flags & SECTION_WRITE)
6323 if (flags & SECTION_CODE)
6327 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
6331 default_pe_asm_named_section (const char *name, unsigned int flags,
6334 default_coff_asm_named_section (name, flags, decl);
6336 if (flags & SECTION_LINKONCE)
6338 /* Functions may have been compiled at various levels of
6339 optimization so we can't use `same_size' here.
6340 Instead, have the linker pick one. */
6341 fprintf (asm_out_file, "\t.linkonce %s\n",
6342 (flags & SECTION_CODE ? "discard" : "same_size"));
6346 /* The lame default section selector. */
6349 default_select_section (tree decl, int reloc,
6350 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6354 if (decl_readonly_section (decl, reloc))
6355 return readonly_data_section;
6357 else if (TREE_CODE (decl) == CONSTRUCTOR)
6359 if (! ((flag_pic && reloc)
6360 || !TREE_READONLY (decl)
6361 || TREE_SIDE_EFFECTS (decl)
6362 || !TREE_CONSTANT (decl)))
6363 return readonly_data_section;
6365 else if (TREE_CODE (decl) == STRING_CST)
6366 return readonly_data_section;
6367 else if (! (flag_pic && reloc))
6368 return readonly_data_section;
6370 return data_section;
6373 enum section_category
6374 categorize_decl_for_section (const_tree decl, int reloc)
6376 enum section_category ret;
6378 if (TREE_CODE (decl) == FUNCTION_DECL)
6380 else if (TREE_CODE (decl) == STRING_CST)
6382 if ((flag_sanitize & SANITIZE_ADDRESS)
6383 && asan_protect_global (CONST_CAST_TREE (decl)))
6384 /* or !flag_merge_constants */
6385 return SECCAT_RODATA;
6387 return SECCAT_RODATA_MERGE_STR;
6389 else if (TREE_CODE (decl) == VAR_DECL)
6391 tree d = CONST_CAST_TREE (decl);
6392 if (bss_initializer_p (decl))
6394 else if (! TREE_READONLY (decl)
6395 || TREE_SIDE_EFFECTS (decl)
6396 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
6398 /* Here the reloc_rw_mask is not testing whether the section should
6399 be read-only or not, but whether the dynamic link will have to
6400 do something. If so, we wish to segregate the data in order to
6401 minimize cache misses inside the dynamic linker. */
6402 if (reloc & targetm.asm_out.reloc_rw_mask ())
6403 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
6407 else if (reloc & targetm.asm_out.reloc_rw_mask ())
6408 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
6409 else if (reloc || flag_merge_constants < 2
6410 || ((flag_sanitize & SANITIZE_ADDRESS)
6411 /* PR 81697: for architectures that use section anchors we
6412 need to ignore DECL_RTL_SET_P (decl) for string constants
6413 inside this asan_protect_global call because otherwise
6414 we'll wrongly put them into SECCAT_RODATA_MERGE_CONST
6415 section, set DECL_RTL (decl) later on and add DECL to
6416 protected globals via successive asan_protect_global
6417 calls. In this scenario we'll end up with wrong
6418 alignment of these strings at runtime and possible ASan
6420 && asan_protect_global (d, use_object_blocks_p ()
6421 && use_blocks_for_decl_p (d))))
6422 /* C and C++ don't allow different variables to share the same
6423 location. -fmerge-all-constants allows even that (at the
6424 expense of not conforming). */
6425 ret = SECCAT_RODATA;
6426 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
6427 ret = SECCAT_RODATA_MERGE_STR_INIT;
6429 ret = SECCAT_RODATA_MERGE_CONST;
6431 else if (TREE_CODE (decl) == CONSTRUCTOR)
6433 if ((reloc & targetm.asm_out.reloc_rw_mask ())
6434 || TREE_SIDE_EFFECTS (decl)
6435 || ! TREE_CONSTANT (decl))
6438 ret = SECCAT_RODATA;
6441 ret = SECCAT_RODATA;
6443 /* There are no read-only thread-local sections. */
6444 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
6446 /* Note that this would be *just* SECCAT_BSS, except that there's
6447 no concept of a read-only thread-local-data section. */
6448 if (ret == SECCAT_BSS
6449 || (flag_zero_initialized_in_bss
6450 && initializer_zerop (DECL_INITIAL (decl))))
6456 /* If the target uses small data sections, select it. */
6457 else if (targetm.in_small_data_p (decl))
6459 if (ret == SECCAT_BSS)
6461 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
6462 ret = SECCAT_SRODATA;
6471 decl_readonly_section_1 (enum section_category category)
6476 case SECCAT_RODATA_MERGE_STR:
6477 case SECCAT_RODATA_MERGE_STR_INIT:
6478 case SECCAT_RODATA_MERGE_CONST:
6479 case SECCAT_SRODATA:
6487 decl_readonly_section (const_tree decl, int reloc)
6489 return decl_readonly_section_1 (categorize_decl_for_section (decl, reloc));
6492 /* Select a section based on the above categorization. */
6495 default_elf_select_section (tree decl, int reloc,
6496 unsigned HOST_WIDE_INT align)
6499 switch (categorize_decl_for_section (decl, reloc))
6502 /* We're not supposed to be called on FUNCTION_DECLs. */
6505 return readonly_data_section;
6506 case SECCAT_RODATA_MERGE_STR:
6507 return mergeable_string_section (decl, align, 0);
6508 case SECCAT_RODATA_MERGE_STR_INIT:
6509 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
6510 case SECCAT_RODATA_MERGE_CONST:
6511 return mergeable_constant_section (DECL_MODE (decl), align, 0);
6512 case SECCAT_SRODATA:
6516 return data_section;
6517 case SECCAT_DATA_REL:
6518 sname = ".data.rel";
6520 case SECCAT_DATA_REL_LOCAL:
6521 sname = ".data.rel.local";
6523 case SECCAT_DATA_REL_RO:
6524 sname = ".data.rel.ro";
6526 case SECCAT_DATA_REL_RO_LOCAL:
6527 sname = ".data.rel.ro.local";
6550 return get_named_section (decl, sname, reloc);
6553 /* Construct a unique section name based on the decl name and the
6554 categorization performed above. */
6557 default_unique_section (tree decl, int reloc)
6559 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6560 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
6561 const char *prefix, *name, *linkonce;
6565 switch (categorize_decl_for_section (decl, reloc))
6568 prefix = one_only ? ".t" : ".text";
6571 case SECCAT_RODATA_MERGE_STR:
6572 case SECCAT_RODATA_MERGE_STR_INIT:
6573 case SECCAT_RODATA_MERGE_CONST:
6574 prefix = one_only ? ".r" : ".rodata";
6576 case SECCAT_SRODATA:
6577 prefix = one_only ? ".s2" : ".sdata2";
6580 prefix = one_only ? ".d" : ".data";
6582 case SECCAT_DATA_REL:
6583 prefix = one_only ? ".d.rel" : ".data.rel";
6585 case SECCAT_DATA_REL_LOCAL:
6586 prefix = one_only ? ".d.rel.local" : ".data.rel.local";
6588 case SECCAT_DATA_REL_RO:
6589 prefix = one_only ? ".d.rel.ro" : ".data.rel.ro";
6591 case SECCAT_DATA_REL_RO_LOCAL:
6592 prefix = one_only ? ".d.rel.ro.local" : ".data.rel.ro.local";
6595 prefix = one_only ? ".s" : ".sdata";
6598 prefix = one_only ? ".b" : ".bss";
6601 prefix = one_only ? ".sb" : ".sbss";
6604 prefix = one_only ? ".td" : ".tdata";
6607 prefix = one_only ? ".tb" : ".tbss";
6613 id = DECL_ASSEMBLER_NAME (decl);
6614 ultimate_transparent_alias_target (&id);
6615 name = IDENTIFIER_POINTER (id);
6616 name = targetm.strip_name_encoding (name);
6618 /* If we're using one_only, then there needs to be a .gnu.linkonce
6619 prefix to the section name. */
6620 linkonce = one_only ? ".gnu.linkonce" : "";
6622 string = ACONCAT ((linkonce, prefix, ".", name, NULL));
6624 set_decl_section_name (decl, string);
6627 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6630 compute_reloc_for_rtx_1 (const_rtx x)
6632 switch (GET_CODE (x))
6635 return SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
6643 /* Like compute_reloc_for_constant, except for an RTX. The return value
6644 is a mask for which bit 1 indicates a global relocation, and bit 0
6645 indicates a local relocation. */
6648 compute_reloc_for_rtx (const_rtx x)
6650 switch (GET_CODE (x))
6654 return compute_reloc_for_rtx_1 (x);
6659 subrtx_iterator::array_type array;
6660 FOR_EACH_SUBRTX (iter, array, x, ALL)
6661 reloc |= compute_reloc_for_rtx_1 (*iter);
6671 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED,
6673 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6675 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
6676 return data_section;
6678 return readonly_data_section;
6682 default_elf_select_rtx_section (machine_mode mode, rtx x,
6683 unsigned HOST_WIDE_INT align)
6685 int reloc = compute_reloc_for_rtx (x);
6687 /* ??? Handle small data here somehow. */
6689 if (reloc & targetm.asm_out.reloc_rw_mask ())
6692 return get_named_section (NULL, ".data.rel.ro.local", 1);
6694 return get_named_section (NULL, ".data.rel.ro", 3);
6697 return mergeable_constant_section (mode, align, 0);
6700 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6703 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
6708 /* Careful not to prod global register variables. */
6711 symbol = XEXP (rtl, 0);
6712 if (GET_CODE (symbol) != SYMBOL_REF)
6715 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
6716 if (TREE_CODE (decl) == FUNCTION_DECL)
6717 flags |= SYMBOL_FLAG_FUNCTION;
6718 if (targetm.binds_local_p (decl))
6719 flags |= SYMBOL_FLAG_LOCAL;
6720 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
6721 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
6722 else if (targetm.in_small_data_p (decl))
6723 flags |= SYMBOL_FLAG_SMALL;
6724 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6725 being PUBLIC, the thing *must* be defined in this translation unit.
6726 Prevent this buglet from being propagated into rtl code as well. */
6727 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
6728 flags |= SYMBOL_FLAG_EXTERNAL;
6730 SYMBOL_REF_FLAGS (symbol) = flags;
6733 /* By default, we do nothing for encode_section_info, so we need not
6734 do anything but discard the '*' marker. */
6737 default_strip_name_encoding (const char *str)
6739 return str + (*str == '*');
6742 #ifdef ASM_OUTPUT_DEF
6743 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6744 anchor relative to ".", the current section position. */
6747 default_asm_output_anchor (rtx symbol)
6751 sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
6752 SYMBOL_REF_BLOCK_OFFSET (symbol));
6753 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
6757 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6760 default_use_anchors_for_symbol_p (const_rtx symbol)
6765 /* Don't use anchors for mergeable sections. The linker might move
6766 the objects around. */
6767 sect = SYMBOL_REF_BLOCK (symbol)->sect;
6768 if (sect->common.flags & SECTION_MERGE)
6771 /* Don't use anchors for small data sections. The small data register
6772 acts as an anchor for such sections. */
6773 if (sect->common.flags & SECTION_SMALL)
6776 decl = SYMBOL_REF_DECL (symbol);
6777 if (decl && DECL_P (decl))
6779 /* Don't use section anchors for decls that might be defined or
6780 usurped by other modules. */
6781 if (TREE_PUBLIC (decl) && !decl_binds_to_current_def_p (decl))
6784 /* Don't use section anchors for decls that will be placed in a
6785 small data section. */
6786 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6787 one above. The problem is that we only use SECTION_SMALL for
6788 sections that should be marked as small in the section directive. */
6789 if (targetm.in_small_data_p (decl))
6792 /* Don't use section anchors for decls that won't fit inside a single
6793 anchor range to reduce the amount of instructions required to refer
6794 to the entire declaration. */
6795 if (DECL_SIZE_UNIT (decl) == NULL_TREE
6796 || !tree_fits_uhwi_p (DECL_SIZE_UNIT (decl))
6797 || (tree_to_uhwi (DECL_SIZE_UNIT (decl))
6798 >= (unsigned HOST_WIDE_INT) targetm.max_anchor_offset))
6805 /* Return true when RESOLUTION indicate that symbol will be bound to the
6806 definition provided by current .o file. */
6809 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution)
6811 return (resolution == LDPR_PREVAILING_DEF
6812 || resolution == LDPR_PREVAILING_DEF_IRONLY_EXP
6813 || resolution == LDPR_PREVAILING_DEF_IRONLY);
6816 /* Return true when RESOLUTION indicate that symbol will be bound locally
6817 within current executable or DSO. */
6820 resolution_local_p (enum ld_plugin_symbol_resolution resolution)
6822 return (resolution == LDPR_PREVAILING_DEF
6823 || resolution == LDPR_PREVAILING_DEF_IRONLY
6824 || resolution == LDPR_PREVAILING_DEF_IRONLY_EXP
6825 || resolution == LDPR_PREEMPTED_REG
6826 || resolution == LDPR_PREEMPTED_IR
6827 || resolution == LDPR_RESOLVED_IR
6828 || resolution == LDPR_RESOLVED_EXEC);
6831 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6832 uninitialized common symbol in the executable will still be defined
6833 (through COPY relocation) in the executable. */
6836 default_binds_local_p_3 (const_tree exp, bool shlib, bool weak_dominate,
6837 bool extern_protected_data, bool common_local_p)
6839 /* A non-decl is an entry in the constant pool. */
6843 /* Weakrefs may not bind locally, even though the weakref itself is always
6844 static and therefore local. Similarly, the resolver for ifunc functions
6845 might resolve to a non-local function.
6846 FIXME: We can resolve the weakref case more curefuly by looking at the
6848 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp))
6849 || (TREE_CODE (exp) == FUNCTION_DECL
6850 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp))))
6853 /* Static variables are always local. */
6854 if (! TREE_PUBLIC (exp))
6857 /* With resolution file in hand, take look into resolutions.
6858 We can't just return true for resolved_locally symbols,
6859 because dynamic linking might overwrite symbols
6860 in shared libraries. */
6861 bool resolved_locally = false;
6863 bool uninited_common = (DECL_COMMON (exp)
6864 && (DECL_INITIAL (exp) == NULL
6866 && DECL_INITIAL (exp) == error_mark_node)));
6868 /* A non-external variable is defined locally only if it isn't
6869 uninitialized COMMON variable or common_local_p is true. */
6870 bool defined_locally = (!DECL_EXTERNAL (exp)
6871 && (!uninited_common || common_local_p));
6872 if (symtab_node *node = symtab_node::get (exp))
6874 if (node->in_other_partition)
6875 defined_locally = true;
6876 if (node->can_be_discarded_p ())
6878 else if (resolution_to_local_definition_p (node->resolution))
6879 defined_locally = resolved_locally = true;
6880 else if (resolution_local_p (node->resolution))
6881 resolved_locally = true;
6883 if (defined_locally && weak_dominate && !shlib)
6884 resolved_locally = true;
6886 /* Undefined weak symbols are never defined locally. */
6887 if (DECL_WEAK (exp) && !defined_locally)
6890 /* A symbol is local if the user has said explicitly that it will be,
6891 or if we have a definition for the symbol. We cannot infer visibility
6892 for undefined symbols. */
6893 if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT
6894 && (TREE_CODE (exp) == FUNCTION_DECL
6895 || !extern_protected_data
6896 || DECL_VISIBILITY (exp) != VISIBILITY_PROTECTED)
6897 && (DECL_VISIBILITY_SPECIFIED (exp) || defined_locally))
6900 /* If PIC, then assume that any global name can be overridden by
6901 symbols resolved from other modules. */
6905 /* Variables defined outside this object might not be local. */
6906 if (DECL_EXTERNAL (exp) && !resolved_locally)
6909 /* Non-dominant weak symbols are not defined locally. */
6910 if (DECL_WEAK (exp) && !resolved_locally)
6913 /* Uninitialized COMMON variable may be unified with symbols
6914 resolved from other modules. */
6915 if (uninited_common && !resolved_locally)
6918 /* Otherwise we're left with initialized (or non-common) global data
6919 which is of necessity defined locally. */
6923 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6924 wrt cross-module name binding. */
6927 default_binds_local_p (const_tree exp)
6929 return default_binds_local_p_3 (exp, flag_shlib != 0, true, false, false);
6932 /* Similar to default_binds_local_p, but common symbol may be local and
6933 extern protected data is non-local. */
6936 default_binds_local_p_2 (const_tree exp)
6938 return default_binds_local_p_3 (exp, flag_shlib != 0, true, true,
6943 default_binds_local_p_1 (const_tree exp, int shlib)
6945 return default_binds_local_p_3 (exp, shlib != 0, false, false, false);
6948 /* Return true when references to DECL must bind to current definition in
6951 The condition is usually equivalent to whether the function binds to the
6952 current module (shared library or executable), that is to binds_local_p.
6953 We use this fact to avoid need for another target hook and implement
6954 the logic using binds_local_p and just special cases where
6955 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6956 the weak definitions (that can be overwritten at linktime by other
6957 definition from different object file) and when resolution info is available
6958 we simply use the knowledge passed to us by linker plugin. */
6960 decl_binds_to_current_def_p (const_tree decl)
6962 gcc_assert (DECL_P (decl));
6963 if (!targetm.binds_local_p (decl))
6965 if (!TREE_PUBLIC (decl))
6968 /* When resolution is available, just use it. */
6969 if (symtab_node *node = symtab_node::get (decl))
6971 if (node->resolution != LDPR_UNKNOWN
6972 && !node->can_be_discarded_p ())
6973 return resolution_to_local_definition_p (node->resolution);
6976 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6977 binds locally but still can be overwritten), DECL_COMMON (can be merged
6978 with a non-common definition somewhere in the same module) or
6980 This rely on fact that binds_local_p behave as decl_replaceable_p
6981 for all other declaration types. */
6982 if (DECL_WEAK (decl))
6984 if (DECL_COMMON (decl)
6985 && (DECL_INITIAL (decl) == NULL
6986 || (!in_lto_p && DECL_INITIAL (decl) == error_mark_node)))
6988 if (DECL_EXTERNAL (decl))
6993 /* A replaceable function or variable is one which may be replaced
6994 at link-time with an entirely different definition, provided that the
6995 replacement has the same type. For example, functions declared
6996 with __attribute__((weak)) on most systems are replaceable.
6998 COMDAT functions are not replaceable, since all definitions of the
6999 function must be equivalent. It is important that COMDAT functions
7000 not be treated as replaceable so that use of C++ template
7001 instantiations is not penalized. */
7004 decl_replaceable_p (tree decl)
7006 gcc_assert (DECL_P (decl));
7007 if (!TREE_PUBLIC (decl) || DECL_COMDAT (decl))
7009 if (!flag_semantic_interposition
7010 && !DECL_WEAK (decl))
7012 return !decl_binds_to_current_def_p (decl);
7015 /* Default function to output code that will globalize a label. A
7016 target must define GLOBAL_ASM_OP or provide its own function to
7017 globalize a label. */
7018 #ifdef GLOBAL_ASM_OP
7020 default_globalize_label (FILE * stream, const char *name)
7022 fputs (GLOBAL_ASM_OP, stream);
7023 assemble_name (stream, name);
7024 putc ('\n', stream);
7026 #endif /* GLOBAL_ASM_OP */
7028 /* Default function to output code that will globalize a declaration. */
7030 default_globalize_decl_name (FILE * stream, tree decl)
7032 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
7033 targetm.asm_out.globalize_label (stream, name);
7036 /* Default function to output a label for unwind information. The
7037 default is to do nothing. A target that needs nonlocal labels for
7038 unwind information must provide its own function to do this. */
7040 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
7041 tree decl ATTRIBUTE_UNUSED,
7042 int for_eh ATTRIBUTE_UNUSED,
7043 int empty ATTRIBUTE_UNUSED)
7047 /* Default function to output a label to divide up the exception table.
7048 The default is to do nothing. A target that needs/wants to divide
7049 up the table must provide it's own function to do this. */
7051 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
7055 /* This is how to output an internal numbered label where PREFIX is
7056 the class of label and LABELNO is the number within the class. */
7059 default_generate_internal_label (char *buf, const char *prefix,
7060 unsigned long labelno)
7062 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
7065 /* This is how to output an internal numbered label where PREFIX is
7066 the class of label and LABELNO is the number within the class. */
7069 default_internal_label (FILE *stream, const char *prefix,
7070 unsigned long labelno)
7072 char *const buf = (char *) alloca (40 + strlen (prefix));
7073 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
7074 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
7078 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7081 default_asm_declare_constant_name (FILE *file, const char *name,
7082 const_tree exp ATTRIBUTE_UNUSED,
7083 HOST_WIDE_INT size ATTRIBUTE_UNUSED)
7085 assemble_label (file, name);
7088 /* This is the default behavior at the beginning of a file. It's
7089 controlled by two other target-hook toggles. */
7091 default_file_start (void)
7093 if (targetm.asm_file_start_app_off
7094 && !(flag_verbose_asm || flag_debug_asm || flag_dump_rtl_in_asm))
7095 fputs (ASM_APP_OFF, asm_out_file);
7097 if (targetm.asm_file_start_file_directive)
7099 /* LTO produced units have no meaningful main_input_filename. */
7101 output_file_directive (asm_out_file, "<artificial>");
7103 output_file_directive (asm_out_file, main_input_filename);
7107 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7108 which emits a special section directive used to indicate whether or
7109 not this object file needs an executable stack. This is primarily
7110 a GNU extension to ELF but could be used on other targets. */
7112 int trampolines_created;
7115 file_end_indicate_exec_stack (void)
7117 unsigned int flags = SECTION_DEBUG;
7118 if (trampolines_created)
7119 flags |= SECTION_CODE;
7121 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
7124 /* Emit a special section directive to indicate that this object file
7125 was compiled with -fsplit-stack. This is used to let the linker
7126 detect calls between split-stack code and non-split-stack code, so
7127 that it can modify the split-stack code to allocate a sufficiently
7128 large stack. We emit another special section if there are any
7129 functions in this file which have the no_split_stack attribute, to
7130 prevent the linker from warning about being unable to convert the
7131 functions if they call non-split-stack code. */
7134 file_end_indicate_split_stack (void)
7136 if (flag_split_stack)
7138 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG,
7140 if (saw_no_split_stack)
7141 switch_to_section (get_section (".note.GNU-no-split-stack",
7142 SECTION_DEBUG, NULL));
7146 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7147 a get_unnamed_section callback. */
7150 output_section_asm_op (const void *directive)
7152 fprintf (asm_out_file, "%s\n", (const char *) directive);
7155 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7156 the current section is NEW_SECTION. */
7159 switch_to_section (section *new_section)
7161 if (in_section == new_section)
7164 if (new_section->common.flags & SECTION_FORGET)
7167 in_section = new_section;
7169 switch (SECTION_STYLE (new_section))
7172 targetm.asm_out.named_section (new_section->named.name,
7173 new_section->named.common.flags,
7174 new_section->named.decl);
7177 case SECTION_UNNAMED:
7178 new_section->unnamed.callback (new_section->unnamed.data);
7181 case SECTION_NOSWITCH:
7186 new_section->common.flags |= SECTION_DECLARED;
7189 /* If block symbol SYMBOL has not yet been assigned an offset, place
7190 it at the end of its block. */
7193 place_block_symbol (rtx symbol)
7195 unsigned HOST_WIDE_INT size, mask, offset;
7196 struct constant_descriptor_rtx *desc;
7197 unsigned int alignment;
7198 struct object_block *block;
7201 gcc_assert (SYMBOL_REF_BLOCK (symbol));
7202 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
7205 /* Work out the symbol's size and alignment. */
7206 if (CONSTANT_POOL_ADDRESS_P (symbol))
7208 desc = SYMBOL_REF_CONSTANT (symbol);
7209 alignment = desc->align;
7210 size = GET_MODE_SIZE (desc->mode);
7212 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
7214 decl = SYMBOL_REF_DECL (symbol);
7215 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl));
7216 alignment = DECL_ALIGN (decl);
7217 size = get_constant_size (DECL_INITIAL (decl));
7218 if ((flag_sanitize & SANITIZE_ADDRESS)
7219 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
7220 && asan_protect_global (DECL_INITIAL (decl)))
7222 size += asan_red_zone_size (size);
7223 alignment = MAX (alignment,
7224 ASAN_RED_ZONE_SIZE * BITS_PER_UNIT);
7229 struct symtab_node *snode;
7230 decl = SYMBOL_REF_DECL (symbol);
7232 snode = symtab_node::get (decl);
7235 rtx target = DECL_RTL (snode->ultimate_alias_target ()->decl);
7237 gcc_assert (MEM_P (target)
7238 && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
7239 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target, 0)));
7240 target = XEXP (target, 0);
7241 place_block_symbol (target);
7242 SYMBOL_REF_BLOCK_OFFSET (symbol) = SYMBOL_REF_BLOCK_OFFSET (target);
7245 alignment = get_variable_align (decl);
7246 size = tree_to_uhwi (DECL_SIZE_UNIT (decl));
7247 if ((flag_sanitize & SANITIZE_ADDRESS)
7248 && asan_protect_global (decl))
7250 size += asan_red_zone_size (size);
7251 alignment = MAX (alignment,
7252 ASAN_RED_ZONE_SIZE * BITS_PER_UNIT);
7256 /* Calculate the object's offset from the start of the block. */
7257 block = SYMBOL_REF_BLOCK (symbol);
7258 mask = alignment / BITS_PER_UNIT - 1;
7259 offset = (block->size + mask) & ~mask;
7260 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
7262 /* Record the block's new alignment and size. */
7263 block->alignment = MAX (block->alignment, alignment);
7264 block->size = offset + size;
7266 vec_safe_push (block->objects, symbol);
7269 /* Return the anchor that should be used to address byte offset OFFSET
7270 from the first object in BLOCK. MODEL is the TLS model used
7274 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
7275 enum tls_model model)
7278 unsigned int begin, middle, end;
7279 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
7282 /* Work out the anchor's offset. Use an offset of 0 for the first
7283 anchor so that we don't pessimize the case where we take the address
7284 of a variable at the beginning of the block. This is particularly
7285 useful when a block has only one variable assigned to it.
7287 We try to place anchors RANGE bytes apart, so there can then be
7288 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7289 a ptr_mode offset. With some target settings, the lowest such
7290 anchor might be out of range for the lowest ptr_mode offset;
7291 likewise the highest anchor for the highest offset. Use anchors
7292 at the extreme ends of the ptr_mode range in such cases.
7294 All arithmetic uses unsigned integers in order to avoid
7296 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
7297 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
7298 range = max_offset - min_offset + 1;
7303 bias = HOST_WIDE_INT_1U << (GET_MODE_BITSIZE (ptr_mode) - 1);
7306 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
7307 delta -= delta % range;
7310 offset = (HOST_WIDE_INT) (-delta);
7314 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
7315 delta -= delta % range;
7316 if (delta > bias - 1)
7318 offset = (HOST_WIDE_INT) delta;
7322 /* Do a binary search to see if there's already an anchor we can use.
7323 Set BEGIN to the new anchor's index if not. */
7325 end = vec_safe_length (block->anchors);
7326 while (begin != end)
7328 middle = (end + begin) / 2;
7329 anchor = (*block->anchors)[middle];
7330 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
7332 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
7334 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
7336 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
7342 /* Create a new anchor with a unique label. */
7343 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
7344 anchor = create_block_symbol (ggc_strdup (label), block, offset);
7345 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
7346 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
7348 /* Insert it at index BEGIN. */
7349 vec_safe_insert (block->anchors, begin, anchor);
7353 /* Output the objects in BLOCK. */
7356 output_object_block (struct object_block *block)
7358 struct constant_descriptor_rtx *desc;
7360 HOST_WIDE_INT offset;
7364 if (!block->objects)
7367 /* Switch to the section and make sure that the first byte is
7368 suitably aligned. */
7369 /* Special case VTV comdat sections similar to assemble_variable. */
7370 if (SECTION_STYLE (block->sect) == SECTION_NAMED
7371 && block->sect->named.name
7372 && (strcmp (block->sect->named.name, ".vtable_map_vars") == 0))
7373 handle_vtv_comdat_section (block->sect, block->sect->named.decl);
7375 switch_to_section (block->sect);
7377 assemble_align (block->alignment);
7379 /* Define the values of all anchors relative to the current section
7381 FOR_EACH_VEC_SAFE_ELT (block->anchors, i, symbol)
7382 targetm.asm_out.output_anchor (symbol);
7384 /* Output the objects themselves. */
7386 FOR_EACH_VEC_ELT (*block->objects, i, symbol)
7388 /* Move to the object's offset, padding with zeros if necessary. */
7389 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
7390 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
7391 if (CONSTANT_POOL_ADDRESS_P (symbol))
7393 desc = SYMBOL_REF_CONSTANT (symbol);
7394 /* Pass 1 for align as we have already laid out everything in the block.
7395 So aligning shouldn't be necessary. */
7396 output_constant_pool_1 (desc, 1);
7397 offset += GET_MODE_SIZE (desc->mode);
7399 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
7402 decl = SYMBOL_REF_DECL (symbol);
7403 assemble_constant_contents
7404 (DECL_INITIAL (decl), XSTR (symbol, 0), DECL_ALIGN (decl));
7406 size = get_constant_size (DECL_INITIAL (decl));
7408 if ((flag_sanitize & SANITIZE_ADDRESS)
7409 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
7410 && asan_protect_global (DECL_INITIAL (decl)))
7412 size = asan_red_zone_size (size);
7413 assemble_zeros (size);
7420 decl = SYMBOL_REF_DECL (symbol);
7421 assemble_variable_contents (decl, XSTR (symbol, 0), false);
7422 size = tree_to_uhwi (DECL_SIZE_UNIT (decl));
7424 if ((flag_sanitize & SANITIZE_ADDRESS)
7425 && asan_protect_global (decl))
7427 size = asan_red_zone_size (size);
7428 assemble_zeros (size);
7435 /* A callback for qsort to compare object_blocks. */
7438 output_object_block_compare (const void *x, const void *y)
7440 object_block *p1 = *(object_block * const*)x;
7441 object_block *p2 = *(object_block * const*)y;
7443 if (p1->sect->common.flags & SECTION_NAMED
7444 && !(p2->sect->common.flags & SECTION_NAMED))
7447 if (!(p1->sect->common.flags & SECTION_NAMED)
7448 && p2->sect->common.flags & SECTION_NAMED)
7451 if (p1->sect->common.flags & SECTION_NAMED
7452 && p2->sect->common.flags & SECTION_NAMED)
7453 return strcmp (p1->sect->named.name, p2->sect->named.name);
7455 unsigned f1 = p1->sect->common.flags;
7456 unsigned f2 = p2->sect->common.flags;
7459 return f1 < f2 ? -1 : 1;
7462 /* Output the definitions of all object_blocks. */
7465 output_object_blocks (void)
7467 vec<object_block *, va_heap> v;
7468 v.create (object_block_htab->elements ());
7470 hash_table<object_block_hasher>::iterator hi;
7472 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab, obj, object_block *, hi)
7475 /* Sort them in order to output them in a deterministic manner,
7476 otherwise we may get .rodata sections in different orders with
7478 v.qsort (output_object_block_compare);
7480 FOR_EACH_VEC_ELT (v, i, obj)
7481 output_object_block (obj);
7486 /* This function provides a possible implementation of the
7487 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7488 by -frecord-gcc-switches it creates a new mergeable, string section in the
7489 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7490 contains the switches in ASCII format.
7492 FIXME: This code does not correctly handle double quote characters
7493 that appear inside strings, (it strips them rather than preserving them).
7494 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7495 characters - instead it treats them as sub-string separators. Since
7496 we want to emit NUL strings terminators into the object file we have to use
7500 elf_record_gcc_switches (print_switch_type type, const char * name)
7504 case SWITCH_TYPE_PASSED:
7505 ASM_OUTPUT_ASCII (asm_out_file, name, strlen (name));
7506 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
7509 case SWITCH_TYPE_DESCRIPTIVE:
7512 /* Distinguish between invocations where name is NULL. */
7513 static bool started = false;
7519 sec = get_section (targetm.asm_out.record_gcc_switches_section,
7523 | (SECTION_ENTSIZE & 1),
7525 switch_to_section (sec);
7534 /* The return value is currently ignored by the caller, but must be 0.
7535 For -fverbose-asm the return value would be the number of characters
7536 emitted into the assembler file. */
7540 /* Emit text to declare externally defined symbols. It is needed to
7541 properly support non-default visibility. */
7543 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
7545 const char *name ATTRIBUTE_UNUSED)
7547 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7548 set in order to avoid putting out names that are never really
7549 used. Always output visibility specified in the source. */
7550 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
7551 && (DECL_VISIBILITY_SPECIFIED (decl)
7552 || targetm.binds_local_p (decl)))
7553 maybe_assemble_visibility (decl);
7556 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7559 default_asm_output_source_filename (FILE *file, const char *name)
7561 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7562 ASM_OUTPUT_SOURCE_FILENAME (file, name);
7564 fprintf (file, "\t.file\t");
7565 output_quoted_string (file, name);
7570 /* Output a file name in the form wanted by System V. */
7573 output_file_directive (FILE *asm_file, const char *input_name)
7578 if (input_name == NULL)
7579 input_name = "<stdin>";
7581 input_name = remap_debug_filename (input_name);
7583 len = strlen (input_name);
7584 na = input_name + len;
7586 /* NA gets INPUT_NAME sans directory names. */
7587 while (na > input_name)
7589 if (IS_DIR_SEPARATOR (na[-1]))
7594 targetm.asm_out.output_source_filename (asm_file, na);
7597 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7600 make_debug_expr_from_rtl (const_rtx exp)
7602 tree ddecl = make_node (DEBUG_EXPR_DECL), type;
7603 machine_mode mode = GET_MODE (exp);
7606 DECL_ARTIFICIAL (ddecl) = 1;
7607 if (REG_P (exp) && REG_EXPR (exp))
7608 type = TREE_TYPE (REG_EXPR (exp));
7609 else if (MEM_P (exp) && MEM_EXPR (exp))
7610 type = TREE_TYPE (MEM_EXPR (exp));
7613 if (type && TYPE_MODE (type) == mode)
7614 TREE_TYPE (ddecl) = type;
7616 TREE_TYPE (ddecl) = lang_hooks.types.type_for_mode (mode, 1);
7617 DECL_MODE (ddecl) = mode;
7618 dval = gen_rtx_DEBUG_EXPR (mode);
7619 DEBUG_EXPR_TREE_DECL (dval) = ddecl;
7620 SET_DECL_RTL (ddecl, dval);
7624 #ifdef ELF_ASCII_ESCAPES
7625 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7628 default_elf_asm_output_limited_string (FILE *f, const char *s)
7633 fputs (STRING_ASM_OP, f);
7638 escape = ELF_ASCII_ESCAPES[c];
7646 putc ('0'+((c>>6)&7), f);
7647 putc ('0'+((c>>3)&7), f);
7648 putc ('0'+(c&7), f);
7661 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7664 default_elf_asm_output_ascii (FILE *f, const char *s, unsigned int len)
7666 const char *limit = s + len;
7667 const char *last_null = NULL;
7668 unsigned bytes_in_chunk = 0;
7672 for (; s < limit; s++)
7676 if (bytes_in_chunk >= 60)
7685 for (p = s; p < limit && *p != '\0'; p++)
7692 if (p < limit && (p - s) <= (long) ELF_STRING_LIMIT)
7694 if (bytes_in_chunk > 0)
7701 default_elf_asm_output_limited_string (f, s);
7706 if (bytes_in_chunk == 0)
7707 fputs (ASCII_DATA_ASM_OP "\"", f);
7710 escape = ELF_ASCII_ESCAPES[c];
7719 putc ('0'+((c>>6)&7), f);
7720 putc ('0'+((c>>3)&7), f);
7721 putc ('0'+(c&7), f);
7722 bytes_in_chunk += 4;
7727 bytes_in_chunk += 2;
7734 if (bytes_in_chunk > 0)
7742 static GTY(()) section *elf_init_array_section;
7743 static GTY(()) section *elf_fini_array_section;
7746 get_elf_initfini_array_priority_section (int priority,
7750 if (priority != DEFAULT_INIT_PRIORITY)
7753 sprintf (buf, "%s.%.5u",
7754 constructor_p ? ".init_array" : ".fini_array",
7756 sec = get_section (buf, SECTION_WRITE | SECTION_NOTYPE, NULL_TREE);
7762 if (elf_init_array_section == NULL)
7763 elf_init_array_section
7764 = get_section (".init_array",
7765 SECTION_WRITE | SECTION_NOTYPE, NULL_TREE);
7766 sec = elf_init_array_section;
7770 if (elf_fini_array_section == NULL)
7771 elf_fini_array_section
7772 = get_section (".fini_array",
7773 SECTION_WRITE | SECTION_NOTYPE, NULL_TREE);
7774 sec = elf_fini_array_section;
7780 /* Use .init_array section for constructors. */
7783 default_elf_init_array_asm_out_constructor (rtx symbol, int priority)
7785 section *sec = get_elf_initfini_array_priority_section (priority,
7787 assemble_addr_to_section (symbol, sec);
7790 /* Use .fini_array section for destructors. */
7793 default_elf_fini_array_asm_out_destructor (rtx symbol, int priority)
7795 section *sec = get_elf_initfini_array_priority_section (priority,
7797 assemble_addr_to_section (symbol, sec);
7800 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7802 This is a bit of a cheat. The real default is a no-op, but this
7803 hook is the default for all targets with a .ident directive. */
7806 default_asm_output_ident_directive (const char *ident_str)
7808 const char *ident_asm_op = "\t.ident\t";
7810 /* If we are still in the front end, do not write out the string
7811 to asm_out_file. Instead, add a fake top-level asm statement.
7812 This allows the front ends to use this hook without actually
7813 writing to asm_out_file, to handle #ident or Pragma Ident. */
7814 if (symtab->state == PARSING)
7816 char *buf = ACONCAT ((ident_asm_op, "\"", ident_str, "\"\n", NULL));
7817 symtab->finalize_toplevel_asm (build_string (strlen (buf), buf));
7820 fprintf (asm_out_file, "%s\"%s\"\n", ident_asm_op, ident_str);
7824 /* This function ensures that vtable_map variables are not only
7825 in the comdat section, but that each variable has its own unique
7826 comdat name. Without this the variables end up in the same section
7827 with a single comdat name.
7829 FIXME: resolve_unique_section needs to deal better with
7830 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
7831 that is fixed, this if-else statement can be replaced with
7832 a single call to "switch_to_section (sect)". */
7835 handle_vtv_comdat_section (section *sect, const_tree decl ATTRIBUTE_UNUSED)
7837 #if defined (OBJECT_FORMAT_ELF)
7838 targetm.asm_out.named_section (sect->named.name,
7839 sect->named.common.flags
7844 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
7845 Therefore the following check is used.
7846 In case a the target is PE or COFF a comdat group section
7847 is created, e.g. .vtable_map_vars$foo. The linker places
7848 everything in .vtable_map_vars at the end.
7850 A fix could be made in
7851 gcc/config/i386/winnt.c: i386_pe_unique_section. */
7856 if (TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE)
7857 name = ACONCAT ((sect->named.name, "$",
7858 IDENTIFIER_POINTER (DECL_NAME (decl)), NULL));
7860 name = ACONCAT ((sect->named.name, "$",
7861 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl))),
7864 targetm.asm_out.named_section (name,
7865 sect->named.common.flags
7871 switch_to_section (sect);
7875 #include "gt-varasm.h"