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);
597 /* Return the section for function DECL.
599 If DECL is NULL_TREE, return the text section. We can be passed
600 NULL_TREE under some circumstances by dbxout.c at least.
602 If FORCE_COLD is true, return cold function section ignoring
603 the frequency info of cgraph_node. */
606 function_section_1 (tree decl, bool force_cold)
608 section *section = NULL;
609 enum node_frequency freq = NODE_FREQUENCY_NORMAL;
610 bool startup = false, exit = false;
614 struct cgraph_node *node = cgraph_node::get (decl);
618 freq = node->frequency;
619 startup = node->only_called_at_startup;
620 exit = node->only_called_at_exit;
624 freq = NODE_FREQUENCY_UNLIKELY_EXECUTED;
626 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
627 if (decl != NULL_TREE
628 && DECL_SECTION_NAME (decl) != NULL)
630 if (targetm.asm_out.function_section)
631 section = targetm.asm_out.function_section (decl, freq,
635 return get_named_section (decl, NULL, 0);
638 return targetm.asm_out.select_section
639 (decl, freq == NODE_FREQUENCY_UNLIKELY_EXECUTED,
640 symtab_node::get (decl)->definition_alignment ());
642 if (targetm.asm_out.function_section)
643 section = targetm.asm_out.function_section (decl, freq, startup, exit);
646 return hot_function_section (decl);
650 /* Return the section for function DECL.
652 If DECL is NULL_TREE, return the text section. We can be passed
653 NULL_TREE under some circumstances by dbxout.c at least. */
656 function_section (tree decl)
658 /* Handle cases where function splitting code decides
659 to put function entry point into unlikely executed section
660 despite the fact that the function itself is not cold
661 (i.e. it is called rarely but contains a hot loop that is
662 better to live in hot subsection for the code locality). */
663 return function_section_1 (decl,
664 first_function_block_is_cold);
667 /* Return the section for the current function, take IN_COLD_SECTION_P
671 current_function_section (void)
673 return function_section_1 (current_function_decl, in_cold_section_p);
676 /* Tell assembler to switch to unlikely-to-be-executed text section. */
679 unlikely_text_section (void)
681 return function_section_1 (current_function_decl, true);
684 /* When called within a function context, return true if the function
685 has been assigned a cold text section and if SECT is that section.
686 When called outside a function context, return true if SECT is the
687 default cold section. */
690 unlikely_text_section_p (section *sect)
692 return sect == function_section_1 (current_function_decl, true);
695 /* Return the read-only data section associated with function DECL. */
698 default_function_rodata_section (tree decl)
700 if (decl != NULL_TREE && DECL_SECTION_NAME (decl))
702 const char *name = DECL_SECTION_NAME (decl);
704 if (DECL_COMDAT_GROUP (decl) && HAVE_COMDAT_GROUP)
710 dot = strchr (name + 1, '.');
713 len = strlen (dot) + 8;
714 rname = (char *) alloca (len);
716 strcpy (rname, ".rodata");
718 return get_section (rname, SECTION_LINKONCE, decl);
720 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
721 else if (DECL_COMDAT_GROUP (decl)
722 && strncmp (name, ".gnu.linkonce.t.", 16) == 0)
724 size_t len = strlen (name) + 1;
725 char *rname = (char *) alloca (len);
727 memcpy (rname, name, len);
729 return get_section (rname, SECTION_LINKONCE, decl);
731 /* For .text.foo we want to use .rodata.foo. */
732 else if (flag_function_sections && flag_data_sections
733 && strncmp (name, ".text.", 6) == 0)
735 size_t len = strlen (name) + 1;
736 char *rname = (char *) alloca (len + 2);
738 memcpy (rname, ".rodata", 7);
739 memcpy (rname + 7, name + 5, len - 5);
740 return get_section (rname, 0, decl);
744 return readonly_data_section;
747 /* Return the read-only data section associated with function DECL
748 for targets where that section should be always the single
749 readonly data section. */
752 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED)
754 return readonly_data_section;
757 /* A subroutine of mergeable_string_section and mergeable_constant_section. */
760 function_mergeable_rodata_prefix (void)
762 section *s = targetm.asm_out.function_rodata_section (current_function_decl);
763 if (SECTION_STYLE (s) == SECTION_NAMED)
764 return s->named.name;
766 return targetm.asm_out.mergeable_rodata_prefix;
769 /* Return the section to use for string merging. */
772 mergeable_string_section (tree decl ATTRIBUTE_UNUSED,
773 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
774 unsigned int flags ATTRIBUTE_UNUSED)
778 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
779 && TREE_CODE (decl) == STRING_CST
780 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE
782 && (len = int_size_in_bytes (TREE_TYPE (decl))) > 0
783 && TREE_STRING_LENGTH (decl) >= len)
786 unsigned int modesize;
790 const char *prefix = function_mergeable_rodata_prefix ();
791 char *name = (char *) alloca (strlen (prefix) + 30);
793 mode = TYPE_MODE (TREE_TYPE (TREE_TYPE (decl)));
794 modesize = GET_MODE_BITSIZE (mode);
795 if (modesize >= 8 && modesize <= 256
796 && (modesize & (modesize - 1)) == 0)
798 if (align < modesize)
801 str = TREE_STRING_POINTER (decl);
802 unit = GET_MODE_SIZE (mode);
804 /* Check for embedded NUL characters. */
805 for (i = 0; i < len; i += unit)
807 for (j = 0; j < unit; j++)
808 if (str[i + j] != '\0')
815 sprintf (name, "%s.str%d.%d", prefix,
816 modesize / 8, (int) (align / 8));
817 flags |= (modesize / 8) | SECTION_MERGE | SECTION_STRINGS;
818 return get_section (name, flags, NULL);
823 return readonly_data_section;
826 /* Return the section to use for constant merging. */
829 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED,
830 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED,
831 unsigned int flags ATTRIBUTE_UNUSED)
833 unsigned int modesize = GET_MODE_BITSIZE (mode);
835 if (HAVE_GAS_SHF_MERGE && flag_merge_constants
841 && (align & (align - 1)) == 0)
843 const char *prefix = function_mergeable_rodata_prefix ();
844 char *name = (char *) alloca (strlen (prefix) + 30);
846 sprintf (name, "%s.cst%d", prefix, (int) (align / 8));
847 flags |= (align / 8) | SECTION_MERGE;
848 return get_section (name, flags, NULL);
850 return readonly_data_section;
853 /* Given NAME, a putative register name, discard any customary prefixes. */
856 strip_reg_name (const char *name)
858 #ifdef REGISTER_PREFIX
859 if (!strncmp (name, REGISTER_PREFIX, strlen (REGISTER_PREFIX)))
860 name += strlen (REGISTER_PREFIX);
862 if (name[0] == '%' || name[0] == '#')
867 /* The user has asked for a DECL to have a particular name. Set (or
868 change) it in such a way that we don't prefix an underscore to
871 set_user_assembler_name (tree decl, const char *name)
873 char *starred = (char *) alloca (strlen (name) + 2);
875 strcpy (starred + 1, name);
876 symtab->change_decl_assembler_name (decl, get_identifier (starred));
877 SET_DECL_RTL (decl, NULL_RTX);
880 /* Decode an `asm' spec for a declaration as a register name.
881 Return the register number, or -1 if nothing specified,
882 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
883 or -3 if ASMSPEC is `cc' and is not recognized,
884 or -4 if ASMSPEC is `memory' and is not recognized.
885 Accept an exact spelling or a decimal number.
886 Prefixes such as % are optional. */
889 decode_reg_name_and_count (const char *asmspec, int *pnregs)
891 /* Presume just one register is clobbered. */
898 /* Get rid of confusing prefixes. */
899 asmspec = strip_reg_name (asmspec);
901 /* Allow a decimal number as a "register name". */
902 for (i = strlen (asmspec) - 1; i >= 0; i--)
903 if (! ISDIGIT (asmspec[i]))
905 if (asmspec[0] != 0 && i < 0)
908 if (i < FIRST_PSEUDO_REGISTER && i >= 0 && reg_names[i][0])
914 for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
916 && ! strcmp (asmspec, strip_reg_name (reg_names[i])))
919 #ifdef OVERLAPPING_REGISTER_NAMES
923 const char *const name;
926 } table[] = OVERLAPPING_REGISTER_NAMES;
928 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
930 && ! strcmp (asmspec, table[i].name))
932 *pnregs = table[i].nregs;
933 return table[i].number;
936 #endif /* OVERLAPPING_REGISTER_NAMES */
938 #ifdef ADDITIONAL_REGISTER_NAMES
940 static const struct { const char *const name; const int number; } table[]
941 = ADDITIONAL_REGISTER_NAMES;
943 for (i = 0; i < (int) ARRAY_SIZE (table); i++)
945 && ! strcmp (asmspec, table[i].name)
946 && reg_names[table[i].number][0])
947 return table[i].number;
949 #endif /* ADDITIONAL_REGISTER_NAMES */
951 if (!strcmp (asmspec, "memory"))
954 if (!strcmp (asmspec, "cc"))
964 decode_reg_name (const char *name)
967 return decode_reg_name_and_count (name, &count);
971 /* Return true if DECL's initializer is suitable for a BSS section. */
974 bss_initializer_p (const_tree decl)
976 return (DECL_INITIAL (decl) == NULL
977 /* In LTO we have no errors in program; error_mark_node is used
978 to mark offlined constructors. */
979 || (DECL_INITIAL (decl) == error_mark_node
981 || (flag_zero_initialized_in_bss
982 /* Leave constant zeroes in .rodata so they
984 && !TREE_READONLY (decl)
985 && initializer_zerop (DECL_INITIAL (decl))));
988 /* Compute the alignment of variable specified by DECL.
989 DONT_OUTPUT_DATA is from assemble_variable. */
992 align_variable (tree decl, bool dont_output_data)
994 unsigned int align = DECL_ALIGN (decl);
996 /* In the case for initialing an array whose length isn't specified,
997 where we have not yet been able to do the layout,
998 figure out the proper alignment now. */
999 if (dont_output_data && DECL_SIZE (decl) == 0
1000 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
1001 align = MAX (align, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl))));
1003 /* Some object file formats have a maximum alignment which they support.
1004 In particular, a.out format supports a maximum alignment of 4. */
1005 if (align > MAX_OFILE_ALIGNMENT)
1007 error ("alignment of %q+D is greater than maximum object "
1008 "file alignment %d", decl,
1009 MAX_OFILE_ALIGNMENT/BITS_PER_UNIT);
1010 align = MAX_OFILE_ALIGNMENT;
1013 if (! DECL_USER_ALIGN (decl))
1015 #ifdef DATA_ABI_ALIGNMENT
1016 unsigned int data_abi_align
1017 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl), align);
1018 /* For backwards compatibility, don't assume the ABI alignment for
1020 if (! DECL_THREAD_LOCAL_P (decl) || data_abi_align <= BITS_PER_WORD)
1021 align = data_abi_align;
1024 /* On some machines, it is good to increase alignment sometimes.
1025 But as DECL_ALIGN is used both for actually emitting the variable
1026 and for code accessing the variable as guaranteed alignment, we
1027 can only increase the alignment if it is a performance optimization
1028 if the references to it must bind to the current definition. */
1029 if (decl_binds_to_current_def_p (decl)
1030 && !DECL_VIRTUAL_P (decl))
1032 #ifdef DATA_ALIGNMENT
1033 unsigned int data_align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1034 /* Don't increase alignment too much for TLS variables - TLS space
1036 if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
1039 if (DECL_INITIAL (decl) != 0
1040 /* In LTO we have no errors in program; error_mark_node is used
1041 to mark offlined constructors. */
1042 && (in_lto_p || DECL_INITIAL (decl) != error_mark_node))
1044 unsigned int const_align
1045 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl), align);
1046 /* Don't increase alignment too much for TLS variables - TLS
1047 space is too precious. */
1048 if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
1049 align = const_align;
1054 /* Reset the alignment in case we have made it tighter, so we can benefit
1055 from it in get_pointer_alignment. */
1056 DECL_ALIGN (decl) = align;
1059 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1060 beyond what align_variable returned. */
1063 get_variable_align (tree decl)
1065 unsigned int align = DECL_ALIGN (decl);
1067 /* For user aligned vars or static vars align_variable already did
1069 if (DECL_USER_ALIGN (decl) || !TREE_PUBLIC (decl))
1072 #ifdef DATA_ABI_ALIGNMENT
1073 if (DECL_THREAD_LOCAL_P (decl))
1074 align = DATA_ABI_ALIGNMENT (TREE_TYPE (decl), align);
1077 /* For decls that bind to the current definition, align_variable
1078 did also everything, except for not assuming ABI required alignment
1079 of TLS variables. For other vars, increase the alignment here
1080 as an optimization. */
1081 if (!decl_binds_to_current_def_p (decl))
1083 /* On some machines, it is good to increase alignment sometimes. */
1084 #ifdef DATA_ALIGNMENT
1085 unsigned int data_align = DATA_ALIGNMENT (TREE_TYPE (decl), align);
1086 /* Don't increase alignment too much for TLS variables - TLS space
1088 if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
1091 if (DECL_INITIAL (decl) != 0
1092 /* In LTO we have no errors in program; error_mark_node is used
1093 to mark offlined constructors. */
1094 && (in_lto_p || DECL_INITIAL (decl) != error_mark_node))
1096 unsigned int const_align = CONSTANT_ALIGNMENT (DECL_INITIAL (decl),
1098 /* Don't increase alignment too much for TLS variables - TLS space
1100 if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
1101 align = const_align;
1108 /* Return the section into which the given VAR_DECL or CONST_DECL
1109 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1110 section should be used wherever possible. */
1113 get_variable_section (tree decl, bool prefer_noswitch_p)
1115 addr_space_t as = ADDR_SPACE_GENERIC;
1117 varpool_node *vnode = varpool_node::get (decl);
1120 vnode = vnode->ultimate_alias_target ();
1124 if (TREE_TYPE (decl) != error_mark_node)
1125 as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
1127 /* We need the constructor to figure out reloc flag. */
1129 vnode->get_constructor ();
1131 if (DECL_COMMON (decl))
1133 /* If the decl has been given an explicit section name, or it resides
1134 in a non-generic address space, then it isn't common, and shouldn't
1135 be handled as such. */
1136 gcc_assert (DECL_SECTION_NAME (decl) == NULL
1137 && ADDR_SPACE_GENERIC_P (as));
1138 if (DECL_THREAD_LOCAL_P (decl))
1139 return tls_comm_section;
1140 else if (TREE_PUBLIC (decl) && bss_initializer_p (decl))
1141 return comm_section;
1144 if (DECL_INITIAL (decl) == error_mark_node)
1145 reloc = contains_pointers_p (TREE_TYPE (decl)) ? 3 : 0;
1146 else if (DECL_INITIAL (decl))
1147 reloc = compute_reloc_for_constant (DECL_INITIAL (decl));
1151 resolve_unique_section (decl, reloc, flag_data_sections);
1152 if (IN_NAMED_SECTION (decl))
1153 return get_named_section (decl, NULL, reloc);
1155 if (ADDR_SPACE_GENERIC_P (as)
1156 && !DECL_THREAD_LOCAL_P (decl)
1157 && !(prefer_noswitch_p && targetm.have_switchable_bss_sections)
1158 && bss_initializer_p (decl))
1160 if (!TREE_PUBLIC (decl)
1161 && !((flag_sanitize & SANITIZE_ADDRESS)
1162 && asan_protect_global (decl)))
1163 return lcomm_section;
1164 if (bss_noswitch_section)
1165 return bss_noswitch_section;
1168 return targetm.asm_out.select_section (decl, reloc,
1169 get_variable_align (decl));
1172 /* Return the block into which object_block DECL should be placed. */
1174 static struct object_block *
1175 get_block_for_decl (tree decl)
1179 if (TREE_CODE (decl) == VAR_DECL)
1181 /* The object must be defined in this translation unit. */
1182 if (DECL_EXTERNAL (decl))
1185 /* There's no point using object blocks for something that is
1186 isolated by definition. */
1187 if (DECL_COMDAT_GROUP (decl))
1191 /* We can only calculate block offsets if the decl has a known
1193 if (DECL_SIZE_UNIT (decl) == NULL)
1195 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl)))
1198 /* Find out which section should contain DECL. We cannot put it into
1199 an object block if it requires a standalone definition. */
1200 if (TREE_CODE (decl) == VAR_DECL)
1201 align_variable (decl, 0);
1202 sect = get_variable_section (decl, true);
1203 if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
1206 return get_block_for_section (sect);
1209 /* Make sure block symbol SYMBOL is in block BLOCK. */
1212 change_symbol_block (rtx symbol, struct object_block *block)
1214 if (block != SYMBOL_REF_BLOCK (symbol))
1216 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol) < 0);
1217 SYMBOL_REF_BLOCK (symbol) = block;
1221 /* Return true if it is possible to put DECL in an object_block. */
1224 use_blocks_for_decl_p (tree decl)
1226 struct symtab_node *snode;
1228 /* Only data DECLs can be placed into object blocks. */
1229 if (TREE_CODE (decl) != VAR_DECL && TREE_CODE (decl) != CONST_DECL)
1232 /* Detect decls created by dw2_force_const_mem. Such decls are
1233 special because DECL_INITIAL doesn't specify the decl's true value.
1234 dw2_output_indirect_constants will instead call assemble_variable
1235 with dont_output_data set to 1 and then print the contents itself. */
1236 if (DECL_INITIAL (decl) == decl)
1239 /* If this decl is an alias, then we don't want to emit a
1241 if (TREE_CODE (decl) == VAR_DECL
1242 && (snode = symtab_node::get (decl)) != NULL
1246 return targetm.use_blocks_for_decl_p (decl);
1249 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1250 until we find an identifier that is not itself a transparent alias.
1251 Modify the alias passed to it by reference (and all aliases on the
1252 way to the ultimate target), such that they do not have to be
1253 followed again, and return the ultimate target of the alias
1257 ultimate_transparent_alias_target (tree *alias)
1259 tree target = *alias;
1261 if (IDENTIFIER_TRANSPARENT_ALIAS (target))
1263 gcc_assert (TREE_CHAIN (target));
1264 target = ultimate_transparent_alias_target (&TREE_CHAIN (target));
1265 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target)
1266 && ! TREE_CHAIN (target));
1273 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1274 have static storage duration. In other words, it should not be an
1275 automatic variable, including PARM_DECLs.
1277 There is, however, one exception: this function handles variables
1278 explicitly placed in a particular register by the user.
1280 This is never called for PARM_DECL nodes. */
1283 make_decl_rtl (tree decl)
1285 const char *name = 0;
1290 /* Check that we are not being given an automatic variable. */
1291 gcc_assert (TREE_CODE (decl) != PARM_DECL
1292 && TREE_CODE (decl) != RESULT_DECL);
1294 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1295 gcc_assert (TREE_CODE (decl) != VAR_DECL
1296 || TREE_STATIC (decl)
1297 || TREE_PUBLIC (decl)
1298 || DECL_EXTERNAL (decl)
1299 || DECL_REGISTER (decl));
1301 /* And that we were not given a type or a label. */
1302 gcc_assert (TREE_CODE (decl) != TYPE_DECL
1303 && TREE_CODE (decl) != LABEL_DECL);
1305 /* For a duplicate declaration, we can be called twice on the
1306 same DECL node. Don't discard the RTL already made. */
1307 if (DECL_RTL_SET_P (decl))
1309 /* If the old RTL had the wrong mode, fix the mode. */
1310 x = DECL_RTL (decl);
1311 if (GET_MODE (x) != DECL_MODE (decl))
1312 SET_DECL_RTL (decl, adjust_address_nv (x, DECL_MODE (decl), 0));
1314 if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1317 /* ??? Another way to do this would be to maintain a hashed
1318 table of such critters. Instead of adding stuff to a DECL
1319 to give certain attributes to it, we could use an external
1320 hash map from DECL to set of attributes. */
1322 /* Let the target reassign the RTL if it wants.
1323 This is necessary, for example, when one machine specific
1324 decl attribute overrides another. */
1325 targetm.encode_section_info (decl, DECL_RTL (decl), false);
1327 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1328 on the new decl information. */
1330 && GET_CODE (XEXP (x, 0)) == SYMBOL_REF
1331 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x, 0)))
1332 change_symbol_block (XEXP (x, 0), get_block_for_decl (decl));
1337 /* If this variable belongs to the global constant pool, retrieve the
1338 pre-computed RTL or recompute it in LTO mode. */
1339 if (TREE_CODE (decl) == VAR_DECL && DECL_IN_CONSTANT_POOL (decl))
1341 SET_DECL_RTL (decl, output_constant_def (DECL_INITIAL (decl), 1));
1345 id = DECL_ASSEMBLER_NAME (decl);
1346 if (TREE_CODE (decl) == FUNCTION_DECL
1347 && cgraph_node::get (decl)
1348 && cgraph_node::get (decl)->instrumentation_clone)
1349 ultimate_transparent_alias_target (&id);
1350 name = IDENTIFIER_POINTER (id);
1352 if (name[0] != '*' && TREE_CODE (decl) != FUNCTION_DECL
1353 && DECL_REGISTER (decl))
1355 error ("register name not specified for %q+D", decl);
1357 else if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
1359 const char *asmspec = name+1;
1360 machine_mode mode = DECL_MODE (decl);
1361 reg_number = decode_reg_name (asmspec);
1362 /* First detect errors in declaring global registers. */
1363 if (reg_number == -1)
1364 error ("register name not specified for %q+D", decl);
1365 else if (reg_number < 0)
1366 error ("invalid register name for %q+D", decl);
1367 else if (mode == BLKmode)
1368 error ("data type of %q+D isn%'t suitable for a register",
1370 else if (!in_hard_reg_set_p (accessible_reg_set, mode, reg_number))
1371 error ("the register specified for %q+D cannot be accessed"
1372 " by the current target", decl);
1373 else if (!in_hard_reg_set_p (operand_reg_set, mode, reg_number))
1374 error ("the register specified for %q+D is not general enough"
1375 " to be used as a register variable", decl);
1376 else if (!HARD_REGNO_MODE_OK (reg_number, mode))
1377 error ("register specified for %q+D isn%'t suitable for data type",
1379 /* Now handle properly declared static register variables. */
1384 if (DECL_INITIAL (decl) != 0 && TREE_STATIC (decl))
1386 DECL_INITIAL (decl) = 0;
1387 error ("global register variable has initial value");
1389 if (TREE_THIS_VOLATILE (decl))
1390 warning (OPT_Wvolatile_register_var,
1391 "optimization may eliminate reads and/or "
1392 "writes to register variables");
1394 /* If the user specified one of the eliminables registers here,
1395 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1396 confused with that register and be eliminated. This usage is
1397 somewhat suspect... */
1399 SET_DECL_RTL (decl, gen_raw_REG (mode, reg_number));
1400 ORIGINAL_REGNO (DECL_RTL (decl)) = reg_number;
1401 REG_USERVAR_P (DECL_RTL (decl)) = 1;
1403 if (TREE_STATIC (decl))
1405 /* Make this register global, so not usable for anything
1407 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1408 name = IDENTIFIER_POINTER (DECL_NAME (decl));
1409 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file, decl, reg_number, name);
1411 nregs = hard_regno_nregs[reg_number][mode];
1413 globalize_reg (decl, reg_number + --nregs);
1416 /* As a register variable, it has no section. */
1419 /* Avoid internal errors from invalid register
1421 SET_DECL_ASSEMBLER_NAME (decl, NULL_TREE);
1422 DECL_HARD_REGISTER (decl) = 0;
1423 /* Also avoid SSA inconsistencies by pretending this is an external
1425 DECL_EXTERNAL (decl) = 1;
1428 /* Now handle ordinary static variables and functions (in memory).
1429 Also handle vars declared register invalidly. */
1430 else if (name[0] == '*')
1432 #ifdef REGISTER_PREFIX
1433 if (strlen (REGISTER_PREFIX) != 0)
1435 reg_number = decode_reg_name (name);
1436 if (reg_number >= 0 || reg_number == -3)
1437 error ("register name given for non-register variable %q+D", decl);
1442 /* Specifying a section attribute on a variable forces it into a
1443 non-.bss section, and thus it cannot be common. */
1444 /* FIXME: In general this code should not be necessary because
1445 visibility pass is doing the same work. But notice_global_symbol
1446 is called early and it needs to make DECL_RTL to get the name.
1447 we take care of recomputing the DECL_RTL after visibility is changed. */
1448 if (TREE_CODE (decl) == VAR_DECL
1449 && (TREE_STATIC (decl) || DECL_EXTERNAL (decl))
1450 && DECL_SECTION_NAME (decl) != NULL
1451 && DECL_INITIAL (decl) == NULL_TREE
1452 && DECL_COMMON (decl))
1453 DECL_COMMON (decl) = 0;
1455 /* Variables can't be both common and weak. */
1456 if (TREE_CODE (decl) == VAR_DECL && DECL_WEAK (decl))
1457 DECL_COMMON (decl) = 0;
1459 if (use_object_blocks_p () && use_blocks_for_decl_p (decl))
1460 x = create_block_symbol (name, get_block_for_decl (decl), -1);
1463 machine_mode address_mode = Pmode;
1464 if (TREE_TYPE (decl) != error_mark_node)
1466 addr_space_t as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
1467 address_mode = targetm.addr_space.address_mode (as);
1469 x = gen_rtx_SYMBOL_REF (address_mode, name);
1471 SYMBOL_REF_WEAK (x) = DECL_WEAK (decl);
1472 SET_SYMBOL_REF_DECL (x, decl);
1474 x = gen_rtx_MEM (DECL_MODE (decl), x);
1475 if (TREE_CODE (decl) != FUNCTION_DECL)
1476 set_mem_attributes (x, decl, 1);
1477 SET_DECL_RTL (decl, x);
1479 /* Optionally set flags or add text to the name to record information
1480 such as that it is a function name.
1481 If the name is changed, the macro ASM_OUTPUT_LABELREF
1482 will have to know how to strip this information. */
1483 targetm.encode_section_info (decl, DECL_RTL (decl), true);
1486 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1487 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1491 make_decl_rtl_for_debug (tree decl)
1493 unsigned int save_aliasing_flag;
1496 if (DECL_RTL_SET_P (decl))
1497 return DECL_RTL (decl);
1499 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1500 call new_alias_set. If running with -fcompare-debug, sometimes
1501 we do not want to create alias sets that will throw the alias
1502 numbers off in the comparison dumps. So... clearing
1503 flag_strict_aliasing will keep new_alias_set() from creating a
1505 save_aliasing_flag = flag_strict_aliasing;
1506 flag_strict_aliasing = 0;
1508 rtl = DECL_RTL (decl);
1509 /* Reset DECL_RTL back, as various parts of the compiler expects
1510 DECL_RTL set meaning it is actually going to be output. */
1511 SET_DECL_RTL (decl, NULL);
1513 flag_strict_aliasing = save_aliasing_flag;
1517 /* Output a string of literal assembler code
1518 for an `asm' keyword used between functions. */
1521 assemble_asm (tree string)
1526 if (TREE_CODE (string) == ADDR_EXPR)
1527 string = TREE_OPERAND (string, 0);
1529 p = TREE_STRING_POINTER (string);
1530 fprintf (asm_out_file, "%s%s\n", p[0] == '\t' ? "" : "\t", p);
1533 /* Write the address of the entity given by SYMBOL to SEC. */
1535 assemble_addr_to_section (rtx symbol, section *sec)
1537 switch_to_section (sec);
1538 assemble_align (POINTER_SIZE);
1539 assemble_integer (symbol, POINTER_SIZE_UNITS, POINTER_SIZE, 1);
1542 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1543 not) section for PRIORITY. */
1545 get_cdtor_priority_section (int priority, bool constructor_p)
1549 /* ??? This only works reliably with the GNU linker. */
1550 sprintf (buf, "%s.%.5u",
1551 constructor_p ? ".ctors" : ".dtors",
1552 /* Invert the numbering so the linker puts us in the proper
1553 order; constructors are run from right to left, and the
1554 linker sorts in increasing order. */
1555 MAX_INIT_PRIORITY - priority);
1556 return get_section (buf, SECTION_WRITE, NULL);
1560 default_named_section_asm_out_destructor (rtx symbol, int priority)
1564 if (priority != DEFAULT_INIT_PRIORITY)
1565 sec = get_cdtor_priority_section (priority,
1566 /*constructor_p=*/false);
1568 sec = get_section (".dtors", SECTION_WRITE, NULL);
1570 assemble_addr_to_section (symbol, sec);
1573 #ifdef DTORS_SECTION_ASM_OP
1575 default_dtor_section_asm_out_destructor (rtx symbol,
1576 int priority ATTRIBUTE_UNUSED)
1578 assemble_addr_to_section (symbol, dtors_section);
1583 default_named_section_asm_out_constructor (rtx symbol, int priority)
1587 if (priority != DEFAULT_INIT_PRIORITY)
1588 sec = get_cdtor_priority_section (priority,
1589 /*constructor_p=*/true);
1591 sec = get_section (".ctors", SECTION_WRITE, NULL);
1593 assemble_addr_to_section (symbol, sec);
1596 #ifdef CTORS_SECTION_ASM_OP
1598 default_ctor_section_asm_out_constructor (rtx symbol,
1599 int priority ATTRIBUTE_UNUSED)
1601 assemble_addr_to_section (symbol, ctors_section);
1605 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1606 a nonzero value if the constant pool should be output before the
1607 start of the function, or a zero value if the pool should output
1608 after the end of the function. The default is to put it before the
1611 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1612 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1615 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1616 to be output to assembler.
1617 Set first_global_object_name and weak_global_object_name as appropriate. */
1620 notice_global_symbol (tree decl)
1622 const char **t = &first_global_object_name;
1624 if (first_global_object_name
1625 || !TREE_PUBLIC (decl)
1626 || DECL_EXTERNAL (decl)
1627 || !DECL_NAME (decl)
1628 || (TREE_CODE (decl) == VAR_DECL && DECL_HARD_REGISTER (decl))
1629 || (TREE_CODE (decl) != FUNCTION_DECL
1630 && (TREE_CODE (decl) != VAR_DECL
1631 || (DECL_COMMON (decl)
1632 && (DECL_INITIAL (decl) == 0
1633 || DECL_INITIAL (decl) == error_mark_node)))))
1636 /* We win when global object is found, but it is useful to know about weak
1637 symbol as well so we can produce nicer unique names. */
1638 if (DECL_WEAK (decl) || DECL_ONE_ONLY (decl) || flag_shlib)
1639 t = &weak_global_object_name;
1643 tree id = DECL_ASSEMBLER_NAME (decl);
1644 ultimate_transparent_alias_target (&id);
1645 *t = ggc_strdup (targetm.strip_name_encoding (IDENTIFIER_POINTER (id)));
1649 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1650 current function goes into the cold section, so that targets can use
1651 current_function_section during RTL expansion. DECL describes the
1655 decide_function_section (tree decl)
1657 first_function_block_is_cold = false;
1659 if (flag_reorder_blocks_and_partition)
1660 /* We will decide in assemble_start_function. */
1663 if (DECL_SECTION_NAME (decl))
1665 struct cgraph_node *node = cgraph_node::get (current_function_decl);
1666 /* Calls to function_section rely on first_function_block_is_cold
1668 first_function_block_is_cold = (node
1670 == NODE_FREQUENCY_UNLIKELY_EXECUTED);
1673 in_cold_section_p = first_function_block_is_cold;
1676 /* Get the function's name, as described by its RTL. This may be
1677 different from the DECL_NAME name used in the source file. */
1679 get_fnname_from_decl (tree decl)
1681 rtx x = DECL_RTL (decl);
1682 gcc_assert (MEM_P (x));
1684 gcc_assert (GET_CODE (x) == SYMBOL_REF);
1688 /* Output assembler code for the constant pool of a function and associated
1689 with defining the name of the function. DECL describes the function.
1690 NAME is the function's name. For the constant pool, we use the current
1691 constant pool data. */
1694 assemble_start_function (tree decl, const char *fnname)
1697 char tmp_label[100];
1698 bool hot_label_written = false;
1700 if (flag_reorder_blocks_and_partition)
1702 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTB", const_labelno);
1703 crtl->subsections.hot_section_label = ggc_strdup (tmp_label);
1704 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDB", const_labelno);
1705 crtl->subsections.cold_section_label = ggc_strdup (tmp_label);
1706 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LHOTE", const_labelno);
1707 crtl->subsections.hot_section_end_label = ggc_strdup (tmp_label);
1708 ASM_GENERATE_INTERNAL_LABEL (tmp_label, "LCOLDE", const_labelno);
1709 crtl->subsections.cold_section_end_label = ggc_strdup (tmp_label);
1711 cold_function_name = NULL_TREE;
1715 crtl->subsections.hot_section_label = NULL;
1716 crtl->subsections.cold_section_label = NULL;
1717 crtl->subsections.hot_section_end_label = NULL;
1718 crtl->subsections.cold_section_end_label = NULL;
1721 /* The following code does not need preprocessing in the assembler. */
1725 if (CONSTANT_POOL_BEFORE_FUNCTION)
1726 output_constant_pool (fnname, decl);
1728 align = symtab_node::get (decl)->definition_alignment ();
1730 /* Make sure the not and cold text (code) sections are properly
1731 aligned. This is necessary here in the case where the function
1732 has both hot and cold sections, because we don't want to re-set
1733 the alignment when the section switch happens mid-function. */
1735 if (flag_reorder_blocks_and_partition)
1737 first_function_block_is_cold = false;
1739 switch_to_section (unlikely_text_section ());
1740 assemble_align (align);
1741 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_label);
1743 /* When the function starts with a cold section, we need to explicitly
1744 align the hot section and write out the hot section label.
1745 But if the current function is a thunk, we do not have a CFG. */
1747 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun)->next_bb) == BB_COLD_PARTITION)
1749 switch_to_section (text_section);
1750 assemble_align (align);
1751 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1752 hot_label_written = true;
1753 first_function_block_is_cold = true;
1755 in_cold_section_p = first_function_block_is_cold;
1759 /* Switch to the correct text section for the start of the function. */
1761 switch_to_section (function_section (decl));
1762 if (flag_reorder_blocks_and_partition
1763 && !hot_label_written)
1764 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_label);
1766 /* Tell assembler to move to target machine's alignment for functions. */
1767 align = floor_log2 (align / BITS_PER_UNIT);
1770 ASM_OUTPUT_ALIGN (asm_out_file, align);
1773 /* Handle a user-specified function alignment.
1774 Note that we still need to align to DECL_ALIGN, as above,
1775 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1776 if (! DECL_USER_ALIGN (decl)
1777 && align_functions_log > align
1778 && optimize_function_for_speed_p (cfun))
1780 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1781 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file,
1782 align_functions_log, align_functions - 1);
1784 ASM_OUTPUT_ALIGN (asm_out_file, align_functions_log);
1788 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1789 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file, fnname);
1792 if (!DECL_IGNORED_P (decl))
1793 (*debug_hooks->begin_function) (decl);
1795 /* Make function name accessible from other files, if appropriate. */
1797 if (TREE_PUBLIC (decl)
1798 || (cgraph_node::get (decl)->instrumentation_clone
1799 && cgraph_node::get (decl)->instrumented_version
1800 && TREE_PUBLIC (cgraph_node::get (decl)->instrumented_version->decl)))
1802 notice_global_symbol (decl);
1804 globalize_decl (decl);
1806 maybe_assemble_visibility (decl);
1809 if (DECL_PRESERVE_P (decl))
1810 targetm.asm_out.mark_decl_preserved (fnname);
1812 /* Do any machine/system dependent processing of the function name. */
1813 #ifdef ASM_DECLARE_FUNCTION_NAME
1814 ASM_DECLARE_FUNCTION_NAME (asm_out_file, fnname, current_function_decl);
1816 /* Standard thing is just output label for the function. */
1817 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file, fnname, current_function_decl);
1818 #endif /* ASM_DECLARE_FUNCTION_NAME */
1820 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl)))
1821 saw_no_split_stack = true;
1824 /* Output assembler code associated with defining the size of the
1825 function. DECL describes the function. NAME is the function's name. */
1828 assemble_end_function (tree decl, const char *fnname ATTRIBUTE_UNUSED)
1830 #ifdef ASM_DECLARE_FUNCTION_SIZE
1831 /* We could have switched section in the middle of the function. */
1832 if (flag_reorder_blocks_and_partition)
1833 switch_to_section (function_section (decl));
1834 ASM_DECLARE_FUNCTION_SIZE (asm_out_file, fnname, decl);
1836 if (! CONSTANT_POOL_BEFORE_FUNCTION)
1838 output_constant_pool (fnname, decl);
1839 switch_to_section (function_section (decl)); /* need to switch back */
1841 /* Output labels for end of hot/cold text sections (to be used by
1843 if (flag_reorder_blocks_and_partition)
1845 section *save_text_section;
1847 save_text_section = in_section;
1848 switch_to_section (unlikely_text_section ());
1849 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
1850 if (cold_function_name != NULL_TREE)
1851 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file,
1852 IDENTIFIER_POINTER (cold_function_name),
1855 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.cold_section_end_label);
1856 if (first_function_block_is_cold)
1857 switch_to_section (text_section);
1859 switch_to_section (function_section (decl));
1860 ASM_OUTPUT_LABEL (asm_out_file, crtl->subsections.hot_section_end_label);
1861 switch_to_section (save_text_section);
1865 /* Assemble code to leave SIZE bytes of zeros. */
1868 assemble_zeros (unsigned HOST_WIDE_INT size)
1870 /* Do no output if -fsyntax-only. */
1871 if (flag_syntax_only)
1874 #ifdef ASM_NO_SKIP_IN_TEXT
1875 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1876 so we must output 0s explicitly in the text section. */
1877 if (ASM_NO_SKIP_IN_TEXT && (in_section->common.flags & SECTION_CODE) != 0)
1879 unsigned HOST_WIDE_INT i;
1880 for (i = 0; i < size; i++)
1881 assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
1886 ASM_OUTPUT_SKIP (asm_out_file, size);
1889 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1892 assemble_align (int align)
1894 if (align > BITS_PER_UNIT)
1896 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
1900 /* Assemble a string constant with the specified C string as contents. */
1903 assemble_string (const char *p, int size)
1908 /* If the string is very long, split it up. */
1912 int thissize = size - pos;
1913 if (thissize > maximum)
1916 ASM_OUTPUT_ASCII (asm_out_file, p, thissize);
1924 /* A noswitch_section_callback for lcomm_section. */
1927 emit_local (tree decl ATTRIBUTE_UNUSED,
1928 const char *name ATTRIBUTE_UNUSED,
1929 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1930 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1932 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1933 unsigned int align = symtab_node::get (decl)->definition_alignment ();
1934 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, decl, name,
1937 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1938 unsigned int align = symtab_node::get (decl)->definition_alignment ();
1939 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, align);
1942 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
1947 /* A noswitch_section_callback for bss_noswitch_section. */
1949 #if defined ASM_OUTPUT_ALIGNED_BSS
1951 emit_bss (tree decl ATTRIBUTE_UNUSED,
1952 const char *name ATTRIBUTE_UNUSED,
1953 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1954 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1956 ASM_OUTPUT_ALIGNED_BSS (asm_out_file, decl, name, size,
1957 get_variable_align (decl));
1962 /* A noswitch_section_callback for comm_section. */
1965 emit_common (tree decl ATTRIBUTE_UNUSED,
1966 const char *name ATTRIBUTE_UNUSED,
1967 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1968 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1970 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1971 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file, decl, name,
1972 size, get_variable_align (decl));
1974 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1975 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file, name, size,
1976 get_variable_align (decl));
1979 ASM_OUTPUT_COMMON (asm_out_file, name, size, rounded);
1984 /* A noswitch_section_callback for tls_comm_section. */
1987 emit_tls_common (tree decl ATTRIBUTE_UNUSED,
1988 const char *name ATTRIBUTE_UNUSED,
1989 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED,
1990 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED)
1992 #ifdef ASM_OUTPUT_TLS_COMMON
1993 ASM_OUTPUT_TLS_COMMON (asm_out_file, decl, name, size);
1996 sorry ("thread-local COMMON data not implemented");
2001 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2002 NAME is the name of DECL's SYMBOL_REF. */
2005 assemble_noswitch_variable (tree decl, const char *name, section *sect,
2008 unsigned HOST_WIDE_INT size, rounded;
2010 size = tree_to_uhwi (DECL_SIZE_UNIT (decl));
2013 if ((flag_sanitize & SANITIZE_ADDRESS) && asan_protect_global (decl))
2014 size += asan_red_zone_size (size);
2016 /* Don't allocate zero bytes of common,
2017 since that means "undefined external" in the linker. */
2021 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2022 so that each uninitialized object starts on such a boundary. */
2023 rounded += (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1;
2024 rounded = (rounded / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2025 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2027 if (!sect->noswitch.callback (decl, name, size, rounded)
2028 && (unsigned HOST_WIDE_INT) (align / BITS_PER_UNIT) > rounded)
2029 error ("requested alignment for %q+D is greater than "
2030 "implemented alignment of %wu", decl, rounded);
2033 /* A subroutine of assemble_variable. Output the label and contents of
2034 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2035 is as for assemble_variable. */
2038 assemble_variable_contents (tree decl, const char *name,
2039 bool dont_output_data)
2041 /* Do any machine/system dependent processing of the object. */
2042 #ifdef ASM_DECLARE_OBJECT_NAME
2043 last_assemble_variable_decl = decl;
2044 ASM_DECLARE_OBJECT_NAME (asm_out_file, name, decl);
2046 /* Standard thing is just output label for the object. */
2047 ASM_OUTPUT_LABEL (asm_out_file, name);
2048 #endif /* ASM_DECLARE_OBJECT_NAME */
2050 if (!dont_output_data)
2052 /* Caller is supposed to use varpool_get_constructor when it wants
2053 to output the body. */
2054 gcc_assert (!in_lto_p || DECL_INITIAL (decl) != error_mark_node);
2055 if (DECL_INITIAL (decl)
2056 && DECL_INITIAL (decl) != error_mark_node
2057 && !initializer_zerop (DECL_INITIAL (decl)))
2058 /* Output the actual data. */
2059 output_constant (DECL_INITIAL (decl),
2060 tree_to_uhwi (DECL_SIZE_UNIT (decl)),
2061 get_variable_align (decl),
2064 /* Leave space for it. */
2065 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl)));
2066 targetm.asm_out.decl_end ();
2070 /* Write out assembly for the variable DECL, which is not defined in
2071 the current translation unit. */
2073 assemble_undefined_decl (tree decl)
2075 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
2076 targetm.asm_out.assemble_undefined_decl (asm_out_file, name, decl);
2079 /* Assemble everything that is needed for a variable or function declaration.
2080 Not used for automatic variables, and not used for function definitions.
2081 Should not be called for variables of incomplete structure type.
2083 TOP_LEVEL is nonzero if this variable has file scope.
2084 AT_END is nonzero if this is the special handling, at end of compilation,
2085 to define things that have had only tentative definitions.
2086 DONT_OUTPUT_DATA if nonzero means don't actually output the
2087 initial value (that will be done by the caller). */
2090 assemble_variable (tree decl, int top_level ATTRIBUTE_UNUSED,
2091 int at_end ATTRIBUTE_UNUSED, int dont_output_data)
2094 rtx decl_rtl, symbol;
2097 bool asan_protected = false;
2099 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2100 gcc_assert (TREE_CODE (decl) == VAR_DECL);
2102 /* Emulated TLS had better not get this far. */
2103 gcc_checking_assert (targetm.have_tls || !DECL_THREAD_LOCAL_P (decl));
2105 last_assemble_variable_decl = 0;
2107 /* Normally no need to say anything here for external references,
2108 since assemble_external is called by the language-specific code
2109 when a declaration is first seen. */
2111 if (DECL_EXTERNAL (decl))
2114 /* Do nothing for global register variables. */
2115 if (DECL_RTL_SET_P (decl) && REG_P (DECL_RTL (decl)))
2117 TREE_ASM_WRITTEN (decl) = 1;
2121 /* If type was incomplete when the variable was declared,
2122 see if it is complete now. */
2124 if (DECL_SIZE (decl) == 0)
2125 layout_decl (decl, 0);
2127 /* Still incomplete => don't allocate it; treat the tentative defn
2128 (which is what it must have been) as an `extern' reference. */
2130 if (!dont_output_data && DECL_SIZE (decl) == 0)
2132 error ("storage size of %q+D isn%'t known", decl);
2133 TREE_ASM_WRITTEN (decl) = 1;
2137 /* The first declaration of a variable that comes through this function
2138 decides whether it is global (in C, has external linkage)
2139 or local (in C, has internal linkage). So do nothing more
2140 if this function has already run. */
2142 if (TREE_ASM_WRITTEN (decl))
2145 /* Make sure targetm.encode_section_info is invoked before we set
2147 decl_rtl = DECL_RTL (decl);
2149 TREE_ASM_WRITTEN (decl) = 1;
2151 /* Do no output if -fsyntax-only. */
2152 if (flag_syntax_only)
2155 if (! dont_output_data
2156 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl)))
2158 error ("size of variable %q+D is too large", decl);
2162 gcc_assert (MEM_P (decl_rtl));
2163 gcc_assert (GET_CODE (XEXP (decl_rtl, 0)) == SYMBOL_REF);
2164 symbol = XEXP (decl_rtl, 0);
2166 /* If this symbol belongs to the tree constant pool, output the constant
2167 if it hasn't already been written. */
2168 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
2170 tree decl = SYMBOL_REF_DECL (symbol);
2171 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl)))
2172 output_constant_def_contents (symbol);
2178 name = XSTR (symbol, 0);
2179 if (TREE_PUBLIC (decl) && DECL_NAME (decl))
2180 notice_global_symbol (decl);
2182 /* Compute the alignment of this data. */
2184 align_variable (decl, dont_output_data);
2186 if ((flag_sanitize & SANITIZE_ADDRESS)
2187 && asan_protect_global (decl))
2189 asan_protected = true;
2190 DECL_ALIGN (decl) = MAX (DECL_ALIGN (decl),
2191 ASAN_RED_ZONE_SIZE * BITS_PER_UNIT);
2194 set_mem_align (decl_rtl, DECL_ALIGN (decl));
2196 align = get_variable_align (decl);
2198 if (TREE_PUBLIC (decl))
2199 maybe_assemble_visibility (decl);
2201 if (DECL_PRESERVE_P (decl))
2202 targetm.asm_out.mark_decl_preserved (name);
2204 /* First make the assembler name(s) global if appropriate. */
2205 sect = get_variable_section (decl, false);
2206 if (TREE_PUBLIC (decl)
2207 && (sect->common.flags & SECTION_COMMON) == 0)
2208 globalize_decl (decl);
2210 /* Output any data that we will need to use the address of. */
2211 if (DECL_INITIAL (decl) && DECL_INITIAL (decl) != error_mark_node)
2212 output_addressed_constants (DECL_INITIAL (decl));
2214 /* dbxout.c needs to know this. */
2215 if (sect && (sect->common.flags & SECTION_CODE) != 0)
2216 DECL_IN_TEXT_SECTION (decl) = 1;
2218 /* If the decl is part of an object_block, make sure that the decl
2219 has been positioned within its block, but do not write out its
2220 definition yet. output_object_blocks will do that later. */
2221 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
2223 gcc_assert (!dont_output_data);
2224 place_block_symbol (symbol);
2226 else if (SECTION_STYLE (sect) == SECTION_NOSWITCH)
2227 assemble_noswitch_variable (decl, name, sect, align);
2230 /* Special-case handling of vtv comdat sections. */
2231 if (sect->named.name
2232 && (strcmp (sect->named.name, ".vtable_map_vars") == 0))
2233 handle_vtv_comdat_section (sect, decl);
2235 switch_to_section (sect);
2236 if (align > BITS_PER_UNIT)
2237 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
2238 assemble_variable_contents (decl, name, dont_output_data);
2241 unsigned HOST_WIDE_INT int size
2242 = tree_to_uhwi (DECL_SIZE_UNIT (decl));
2243 assemble_zeros (asan_red_zone_size (size));
2249 /* Given a function declaration (FN_DECL), this function assembles the
2250 function into the .preinit_array section. */
2253 assemble_vtv_preinit_initializer (tree fn_decl)
2256 unsigned flags = SECTION_WRITE;
2257 rtx symbol = XEXP (DECL_RTL (fn_decl), 0);
2259 flags |= SECTION_NOTYPE;
2260 sect = get_section (".preinit_array", flags, fn_decl);
2261 switch_to_section (sect);
2262 assemble_addr_to_section (symbol, sect);
2265 /* Return 1 if type TYPE contains any pointers. */
2268 contains_pointers_p (tree type)
2270 switch (TREE_CODE (type))
2273 case REFERENCE_TYPE:
2274 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2275 so I'll play safe and return 1. */
2281 case QUAL_UNION_TYPE:
2284 /* For a type that has fields, see if the fields have pointers. */
2285 for (fields = TYPE_FIELDS (type); fields; fields = DECL_CHAIN (fields))
2286 if (TREE_CODE (fields) == FIELD_DECL
2287 && contains_pointers_p (TREE_TYPE (fields)))
2293 /* An array type contains pointers if its element type does. */
2294 return contains_pointers_p (TREE_TYPE (type));
2301 /* We delay assemble_external processing until
2302 the compilation unit is finalized. This is the best we can do for
2303 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2304 it all the way to final. See PR 17982 for further discussion. */
2305 static GTY(()) tree pending_assemble_externals;
2307 #ifdef ASM_OUTPUT_EXTERNAL
2308 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2309 As a result, assemble_external can be called after the list of externals
2310 is processed and the pointer set destroyed. */
2311 static bool pending_assemble_externals_processed;
2313 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2314 TREE_LIST in assemble_external. */
2315 static hash_set<tree> *pending_assemble_externals_set;
2317 /* True if DECL is a function decl for which no out-of-line copy exists.
2318 It is assumed that DECL's assembler name has been set. */
2321 incorporeal_function_p (tree decl)
2323 if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl))
2327 if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
2328 && (DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA
2329 || DECL_FUNCTION_CODE (decl) == BUILT_IN_ALLOCA_WITH_ALIGN))
2332 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
2333 /* Atomic or sync builtins which have survived this far will be
2334 resolved externally and therefore are not incorporeal. */
2335 if (strncmp (name, "__builtin_", 10) == 0)
2341 /* Actually do the tests to determine if this is necessary, and invoke
2342 ASM_OUTPUT_EXTERNAL. */
2344 assemble_external_real (tree decl)
2346 rtx rtl = DECL_RTL (decl);
2348 if (MEM_P (rtl) && GET_CODE (XEXP (rtl, 0)) == SYMBOL_REF
2349 && !SYMBOL_REF_USED (XEXP (rtl, 0))
2350 && !incorporeal_function_p (decl))
2352 /* Some systems do require some output. */
2353 SYMBOL_REF_USED (XEXP (rtl, 0)) = 1;
2354 ASM_OUTPUT_EXTERNAL (asm_out_file, decl, XSTR (XEXP (rtl, 0), 0));
2360 process_pending_assemble_externals (void)
2362 #ifdef ASM_OUTPUT_EXTERNAL
2364 for (list = pending_assemble_externals; list; list = TREE_CHAIN (list))
2365 assemble_external_real (TREE_VALUE (list));
2367 pending_assemble_externals = 0;
2368 pending_assemble_externals_processed = true;
2369 delete pending_assemble_externals_set;
2373 /* This TREE_LIST contains any weak symbol declarations waiting
2375 static GTY(()) tree weak_decls;
2377 /* Output something to declare an external symbol to the assembler,
2378 and qualifiers such as weakness. (Most assemblers don't need
2379 extern declaration, so we normally output nothing.) Do nothing if
2380 DECL is not external. */
2383 assemble_external (tree decl ATTRIBUTE_UNUSED)
2385 /* Make sure that the ASM_OUT_FILE is open.
2386 If it's not, we should not be calling this function. */
2387 gcc_assert (asm_out_file);
2389 /* In a perfect world, the following condition would be true.
2390 Sadly, the Java and Go front ends emit assembly *from the front end*,
2391 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2393 /* This function should only be called if we are expanding, or have
2395 Ideally, only final.c would be calling this function, but it is
2396 not clear whether that would break things somehow. See PR 17982
2397 for further discussion. */
2398 gcc_assert (state == EXPANSION
2399 || state == FINISHED);
2402 if (!DECL_P (decl) || !DECL_EXTERNAL (decl) || !TREE_PUBLIC (decl))
2405 /* We want to output annotation for weak and external symbols at
2406 very last to check if they are references or not. */
2408 if (TARGET_SUPPORTS_WEAK
2410 /* TREE_STATIC is a weird and abused creature which is not
2411 generally the right test for whether an entity has been
2412 locally emitted, inlined or otherwise not-really-extern, but
2413 for declarations that can be weak, it happens to be
2415 && !TREE_STATIC (decl)
2416 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl))
2417 && value_member (decl, weak_decls) == NULL_TREE)
2418 weak_decls = tree_cons (NULL, decl, weak_decls);
2420 #ifdef ASM_OUTPUT_EXTERNAL
2421 if (pending_assemble_externals_processed)
2423 assemble_external_real (decl);
2427 if (! pending_assemble_externals_set->add (decl))
2428 pending_assemble_externals = tree_cons (NULL, decl,
2429 pending_assemble_externals);
2433 /* Similar, for calling a library function FUN. */
2436 assemble_external_libcall (rtx fun)
2438 /* Declare library function name external when first used, if nec. */
2439 if (! SYMBOL_REF_USED (fun))
2441 SYMBOL_REF_USED (fun) = 1;
2442 targetm.asm_out.external_libcall (fun);
2446 /* Assemble a label named NAME. */
2449 assemble_label (FILE *file, const char *name)
2451 ASM_OUTPUT_LABEL (file, name);
2454 /* Set the symbol_referenced flag for ID. */
2456 mark_referenced (tree id)
2458 TREE_SYMBOL_REFERENCED (id) = 1;
2461 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2463 mark_decl_referenced (tree decl)
2465 if (TREE_CODE (decl) == FUNCTION_DECL)
2467 /* Extern inline functions don't become needed when referenced.
2468 If we know a method will be emitted in other TU and no new
2469 functions can be marked reachable, just use the external
2471 struct cgraph_node *node = cgraph_node::get_create (decl);
2472 if (!DECL_EXTERNAL (decl)
2473 && !node->definition)
2474 node->mark_force_output ();
2476 else if (TREE_CODE (decl) == VAR_DECL)
2478 varpool_node *node = varpool_node::get_create (decl);
2479 /* C++ frontend use mark_decl_references to force COMDAT variables
2480 to be output that might appear dead otherwise. */
2481 node->force_output = true;
2483 /* else do nothing - we can get various sorts of CST nodes here,
2484 which do not need to be marked. */
2488 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2489 starts with a *, the rest of NAME is output verbatim. Otherwise
2490 NAME is transformed in a target-specific way (usually by the
2491 addition of an underscore). */
2494 assemble_name_raw (FILE *file, const char *name)
2497 fputs (&name[1], file);
2499 ASM_OUTPUT_LABELREF (file, name);
2502 /* Like assemble_name_raw, but should be used when NAME might refer to
2503 an entity that is also represented as a tree (like a function or
2504 variable). If NAME does refer to such an entity, that entity will
2505 be marked as referenced. */
2508 assemble_name (FILE *file, const char *name)
2510 const char *real_name;
2513 real_name = targetm.strip_name_encoding (name);
2515 id = maybe_get_identifier (real_name);
2520 mark_referenced (id);
2521 ultimate_transparent_alias_target (&id);
2523 name = IDENTIFIER_POINTER (id);
2524 gcc_assert (! TREE_CHAIN (id));
2527 assemble_name_raw (file, name);
2530 /* Allocate SIZE bytes writable static space with a gensym name
2531 and return an RTX to refer to its address. */
2534 assemble_static_space (unsigned HOST_WIDE_INT size)
2537 const char *namestring;
2540 ASM_GENERATE_INTERNAL_LABEL (name, "LF", const_labelno);
2542 namestring = ggc_strdup (name);
2544 x = gen_rtx_SYMBOL_REF (Pmode, namestring);
2545 SYMBOL_REF_FLAGS (x) = SYMBOL_FLAG_LOCAL;
2547 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2548 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file, NULL_TREE, name, size,
2551 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2552 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file, name, size, BIGGEST_ALIGNMENT);
2555 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2556 so that each uninitialized object starts on such a boundary. */
2557 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2558 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2559 = ((size + (BIGGEST_ALIGNMENT / BITS_PER_UNIT) - 1)
2560 / (BIGGEST_ALIGNMENT / BITS_PER_UNIT)
2561 * (BIGGEST_ALIGNMENT / BITS_PER_UNIT));
2562 ASM_OUTPUT_LOCAL (asm_out_file, name, size, rounded);
2569 /* Assemble the static constant template for function entry trampolines.
2570 This is done at most once per compilation.
2571 Returns an RTX for the address of the template. */
2573 static GTY(()) rtx initial_trampoline;
2576 assemble_trampoline_template (void)
2583 gcc_assert (targetm.asm_out.trampoline_template != NULL);
2585 if (initial_trampoline)
2586 return initial_trampoline;
2588 /* By default, put trampoline templates in read-only data section. */
2590 #ifdef TRAMPOLINE_SECTION
2591 switch_to_section (TRAMPOLINE_SECTION);
2593 switch_to_section (readonly_data_section);
2596 /* Write the assembler code to define one. */
2597 align = floor_log2 (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT);
2599 ASM_OUTPUT_ALIGN (asm_out_file, align);
2601 targetm.asm_out.internal_label (asm_out_file, "LTRAMP", 0);
2602 targetm.asm_out.trampoline_template (asm_out_file);
2604 /* Record the rtl to refer to it. */
2605 ASM_GENERATE_INTERNAL_LABEL (label, "LTRAMP", 0);
2606 name = ggc_strdup (label);
2607 symbol = gen_rtx_SYMBOL_REF (Pmode, name);
2608 SYMBOL_REF_FLAGS (symbol) = SYMBOL_FLAG_LOCAL;
2610 initial_trampoline = gen_const_mem (BLKmode, symbol);
2611 set_mem_align (initial_trampoline, TRAMPOLINE_ALIGNMENT);
2612 set_mem_size (initial_trampoline, TRAMPOLINE_SIZE);
2614 return initial_trampoline;
2617 /* A and B are either alignments or offsets. Return the minimum alignment
2618 that may be assumed after adding the two together. */
2620 static inline unsigned
2621 min_align (unsigned int a, unsigned int b)
2623 return (a | b) & -(a | b);
2626 /* Return the assembler directive for creating a given kind of integer
2627 object. SIZE is the number of bytes in the object and ALIGNED_P
2628 indicates whether it is known to be aligned. Return NULL if the
2629 assembly dialect has no such directive.
2631 The returned string should be printed at the start of a new line and
2632 be followed immediately by the object's initial value. */
2635 integer_asm_op (int size, int aligned_p)
2637 struct asm_int_op *ops;
2640 ops = &targetm.asm_out.aligned_op;
2642 ops = &targetm.asm_out.unaligned_op;
2647 return targetm.asm_out.byte_op;
2661 /* Use directive OP to assemble an integer object X. Print OP at the
2662 start of the line, followed immediately by the value of X. */
2665 assemble_integer_with_op (const char *op, rtx x)
2667 fputs (op, asm_out_file);
2668 output_addr_const (asm_out_file, x);
2669 fputc ('\n', asm_out_file);
2672 /* The default implementation of the asm_out.integer target hook. */
2675 default_assemble_integer (rtx x ATTRIBUTE_UNUSED,
2676 unsigned int size ATTRIBUTE_UNUSED,
2677 int aligned_p ATTRIBUTE_UNUSED)
2679 const char *op = integer_asm_op (size, aligned_p);
2680 /* Avoid GAS bugs for large values. Specifically negative values whose
2681 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2682 if (size > UNITS_PER_WORD && size > POINTER_SIZE_UNITS)
2684 return op && (assemble_integer_with_op (op, x), true);
2687 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2688 the alignment of the integer in bits. Return 1 if we were able to output
2689 the constant, otherwise 0. We must be able to output the constant,
2690 if FORCE is nonzero. */
2693 assemble_integer (rtx x, unsigned int size, unsigned int align, int force)
2697 aligned_p = (align >= MIN (size * BITS_PER_UNIT, BIGGEST_ALIGNMENT));
2699 /* See if the target hook can handle this kind of object. */
2700 if (targetm.asm_out.integer (x, size, aligned_p))
2703 /* If the object is a multi-byte one, try splitting it up. Split
2704 it into words it if is multi-word, otherwise split it into bytes. */
2707 machine_mode omode, imode;
2708 unsigned int subalign;
2709 unsigned int subsize, i;
2710 enum mode_class mclass;
2712 subsize = size > UNITS_PER_WORD? UNITS_PER_WORD : 1;
2713 subalign = MIN (align, subsize * BITS_PER_UNIT);
2714 if (GET_CODE (x) == CONST_FIXED)
2715 mclass = GET_MODE_CLASS (GET_MODE (x));
2719 omode = mode_for_size (subsize * BITS_PER_UNIT, mclass, 0);
2720 imode = mode_for_size (size * BITS_PER_UNIT, mclass, 0);
2722 for (i = 0; i < size; i += subsize)
2724 rtx partial = simplify_subreg (omode, x, imode, i);
2725 if (!partial || !assemble_integer (partial, subsize, subalign, 0))
2731 /* If we've printed some of it, but not all of it, there's no going
2736 gcc_assert (!force);
2741 /* Assemble the floating-point constant D into an object of size MODE. ALIGN
2742 is the alignment of the constant in bits. If REVERSE is true, D is output
2743 in reverse storage order. */
2746 assemble_real (REAL_VALUE_TYPE d, machine_mode mode, unsigned int align,
2749 long data[4] = {0, 0, 0, 0};
2750 int bitsize, nelts, nunits, units_per;
2753 /* This is hairy. We have a quantity of known size. real_to_target
2754 will put it into an array of *host* longs, 32 bits per element
2755 (even if long is more than 32 bits). We need to determine the
2756 number of array elements that are occupied (nelts) and the number
2757 of *target* min-addressable units that will be occupied in the
2758 object file (nunits). We cannot assume that 32 divides the
2759 mode's bitsize (size * BITS_PER_UNIT) evenly.
2761 size * BITS_PER_UNIT is used here to make sure that padding bits
2762 (which might appear at either end of the value; real_to_target
2763 will include the padding bits in its output array) are included. */
2765 nunits = GET_MODE_SIZE (mode);
2766 bitsize = nunits * BITS_PER_UNIT;
2767 nelts = CEIL (bitsize, 32);
2768 units_per = 32 / BITS_PER_UNIT;
2770 real_to_target (data, &d, mode);
2772 /* Put out the first word with the specified alignment. */
2774 elt = flip_storage_order (SImode, gen_int_mode (data[nelts - 1], SImode));
2776 elt = GEN_INT (data[0]);
2777 assemble_integer (elt, MIN (nunits, units_per), align, 1);
2778 nunits -= units_per;
2780 /* Subsequent words need only 32-bit alignment. */
2781 align = min_align (align, 32);
2783 for (int i = 1; i < nelts; i++)
2786 elt = flip_storage_order (SImode,
2787 gen_int_mode (data[nelts - 1 - i], SImode));
2789 elt = GEN_INT (data[i]);
2790 assemble_integer (elt, MIN (nunits, units_per), align, 1);
2791 nunits -= units_per;
2795 /* Given an expression EXP with a constant value,
2796 reduce it to the sum of an assembler symbol and an integer.
2797 Store them both in the structure *VALUE.
2798 EXP must be reducible. */
2802 HOST_WIDE_INT offset;
2806 decode_addr_const (tree exp, struct addr_const *value)
2808 tree target = TREE_OPERAND (exp, 0);
2814 if (TREE_CODE (target) == COMPONENT_REF
2815 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target, 1))))
2817 offset += int_byte_position (TREE_OPERAND (target, 1));
2818 target = TREE_OPERAND (target, 0);
2820 else if (TREE_CODE (target) == ARRAY_REF
2821 || TREE_CODE (target) == ARRAY_RANGE_REF)
2823 offset += (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target)))
2824 * tree_to_shwi (TREE_OPERAND (target, 1)));
2825 target = TREE_OPERAND (target, 0);
2827 else if (TREE_CODE (target) == MEM_REF
2828 && TREE_CODE (TREE_OPERAND (target, 0)) == ADDR_EXPR)
2830 offset += mem_ref_offset (target).to_short_addr ();
2831 target = TREE_OPERAND (TREE_OPERAND (target, 0), 0);
2833 else if (TREE_CODE (target) == INDIRECT_REF
2834 && TREE_CODE (TREE_OPERAND (target, 0)) == NOP_EXPR
2835 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target, 0), 0))
2837 target = TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target, 0), 0), 0);
2842 switch (TREE_CODE (target))
2846 x = DECL_RTL (target);
2850 x = gen_rtx_MEM (FUNCTION_MODE,
2851 gen_rtx_LABEL_REF (Pmode, force_label_rtx (target)));
2860 x = output_constant_def (target, 1);
2867 gcc_assert (MEM_P (x));
2871 value->offset = offset;
2874 static GTY(()) hash_table<tree_descriptor_hasher> *const_desc_htab;
2876 static void maybe_output_constant_def_contents (struct constant_descriptor_tree *, int);
2878 /* Constant pool accessor function. */
2880 hash_table<tree_descriptor_hasher> *
2881 constant_pool_htab (void)
2883 return const_desc_htab;
2886 /* Compute a hash code for a constant expression. */
2889 tree_descriptor_hasher::hash (constant_descriptor_tree *ptr)
2895 const_hash_1 (const tree exp)
2900 enum tree_code code = TREE_CODE (exp);
2902 /* Either set P and LEN to the address and len of something to hash and
2903 exit the switch or return a value. */
2908 p = (char *) &TREE_INT_CST_ELT (exp, 0);
2909 len = TREE_INT_CST_NUNITS (exp) * sizeof (HOST_WIDE_INT);
2913 return real_hash (TREE_REAL_CST_PTR (exp));
2916 return fixed_hash (TREE_FIXED_CST_PTR (exp));
2919 p = TREE_STRING_POINTER (exp);
2920 len = TREE_STRING_LENGTH (exp);
2924 return (const_hash_1 (TREE_REALPART (exp)) * 5
2925 + const_hash_1 (TREE_IMAGPART (exp)));
2931 hi = 7 + VECTOR_CST_NELTS (exp);
2933 for (i = 0; i < VECTOR_CST_NELTS (exp); ++i)
2934 hi = hi * 563 + const_hash_1 (VECTOR_CST_ELT (exp, i));
2941 unsigned HOST_WIDE_INT idx;
2944 hi = 5 + int_size_in_bytes (TREE_TYPE (exp));
2946 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, value)
2948 hi = hi * 603 + const_hash_1 (value);
2956 struct addr_const value;
2958 decode_addr_const (exp, &value);
2959 switch (GET_CODE (value.base))
2962 /* Don't hash the address of the SYMBOL_REF;
2963 only use the offset and the symbol name. */
2965 p = XSTR (value.base, 0);
2966 for (i = 0; p[i] != 0; i++)
2967 hi = ((hi * 613) + (unsigned) (p[i]));
2972 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (value.base)) * 13);
2982 case POINTER_PLUS_EXPR:
2984 return (const_hash_1 (TREE_OPERAND (exp, 0)) * 9
2985 + const_hash_1 (TREE_OPERAND (exp, 1)));
2988 return const_hash_1 (TREE_OPERAND (exp, 0)) * 7 + 2;
2991 /* A language specific constant. Just hash the code. */
2995 /* Compute hashing function. */
2997 for (i = 0; i < len; i++)
2998 hi = ((hi * 613) + (unsigned) (p[i]));
3003 /* Wrapper of compare_constant, for the htab interface. */
3005 tree_descriptor_hasher::equal (constant_descriptor_tree *c1,
3006 constant_descriptor_tree *c2)
3008 if (c1->hash != c2->hash)
3010 return compare_constant (c1->value, c2->value);
3013 /* Compare t1 and t2, and return 1 only if they are known to result in
3014 the same bit pattern on output. */
3017 compare_constant (const tree t1, const tree t2)
3019 enum tree_code typecode;
3021 if (t1 == NULL_TREE)
3022 return t2 == NULL_TREE;
3023 if (t2 == NULL_TREE)
3026 if (TREE_CODE (t1) != TREE_CODE (t2))
3029 switch (TREE_CODE (t1))
3032 /* Integer constants are the same only if the same width of type. */
3033 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
3035 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
3037 return tree_int_cst_equal (t1, t2);
3040 /* Real constants are the same only if the same width of type. */
3041 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
3044 return real_identical (&TREE_REAL_CST (t1), &TREE_REAL_CST (t2));
3047 /* Fixed constants are the same only if the same width of type. */
3048 if (TYPE_PRECISION (TREE_TYPE (t1)) != TYPE_PRECISION (TREE_TYPE (t2)))
3051 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1), TREE_FIXED_CST (t2));
3054 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2)))
3057 return (TREE_STRING_LENGTH (t1) == TREE_STRING_LENGTH (t2)
3058 && ! memcmp (TREE_STRING_POINTER (t1), TREE_STRING_POINTER (t2),
3059 TREE_STRING_LENGTH (t1)));
3062 return (compare_constant (TREE_REALPART (t1), TREE_REALPART (t2))
3063 && compare_constant (TREE_IMAGPART (t1), TREE_IMAGPART (t2)));
3069 if (VECTOR_CST_NELTS (t1) != VECTOR_CST_NELTS (t2))
3072 for (i = 0; i < VECTOR_CST_NELTS (t1); ++i)
3073 if (!compare_constant (VECTOR_CST_ELT (t1, i),
3074 VECTOR_CST_ELT (t2, i)))
3082 vec<constructor_elt, va_gc> *v1, *v2;
3083 unsigned HOST_WIDE_INT idx;
3085 typecode = TREE_CODE (TREE_TYPE (t1));
3086 if (typecode != TREE_CODE (TREE_TYPE (t2)))
3089 if (typecode == ARRAY_TYPE)
3091 HOST_WIDE_INT size_1 = int_size_in_bytes (TREE_TYPE (t1));
3092 /* For arrays, check that mode, size and storage order match. */
3093 if (TYPE_MODE (TREE_TYPE (t1)) != TYPE_MODE (TREE_TYPE (t2))
3095 || size_1 != int_size_in_bytes (TREE_TYPE (t2))
3096 || TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t1))
3097 != TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (t2)))
3102 /* For record and union constructors, require exact type
3104 if (TREE_TYPE (t1) != TREE_TYPE (t2))
3108 v1 = CONSTRUCTOR_ELTS (t1);
3109 v2 = CONSTRUCTOR_ELTS (t2);
3110 if (vec_safe_length (v1) != vec_safe_length (v2))
3113 for (idx = 0; idx < vec_safe_length (v1); ++idx)
3115 constructor_elt *c1 = &(*v1)[idx];
3116 constructor_elt *c2 = &(*v2)[idx];
3118 /* Check that each value is the same... */
3119 if (!compare_constant (c1->value, c2->value))
3121 /* ... and that they apply to the same fields! */
3122 if (typecode == ARRAY_TYPE)
3124 if (!compare_constant (c1->index, c2->index))
3129 if (c1->index != c2->index)
3140 struct addr_const value1, value2;
3144 decode_addr_const (t1, &value1);
3145 decode_addr_const (t2, &value2);
3147 if (value1.offset != value2.offset)
3150 code = GET_CODE (value1.base);
3151 if (code != GET_CODE (value2.base))
3157 ret = (strcmp (XSTR (value1.base, 0), XSTR (value2.base, 0)) == 0);
3161 ret = (CODE_LABEL_NUMBER (LABEL_REF_LABEL (value1.base))
3162 == CODE_LABEL_NUMBER (LABEL_REF_LABEL (value2.base)));
3172 case POINTER_PLUS_EXPR:
3175 return (compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0))
3176 && compare_constant (TREE_OPERAND (t1, 1), TREE_OPERAND (t2, 1)));
3179 case VIEW_CONVERT_EXPR:
3180 return compare_constant (TREE_OPERAND (t1, 0), TREE_OPERAND (t2, 0));
3189 /* Return the section into which constant EXP should be placed. */
3192 get_constant_section (tree exp, unsigned int align)
3194 return targetm.asm_out.select_section (exp,
3195 compute_reloc_for_constant (exp),
3199 /* Return the size of constant EXP in bytes. */
3201 static HOST_WIDE_INT
3202 get_constant_size (tree exp)
3206 size = int_size_in_bytes (TREE_TYPE (exp));
3207 if (TREE_CODE (exp) == STRING_CST)
3208 size = MAX (TREE_STRING_LENGTH (exp), size);
3212 /* Subroutine of output_constant_def:
3213 No constant equal to EXP is known to have been output.
3214 Make a constant descriptor to enter EXP in the hash table.
3215 Assign the label number and construct RTL to refer to the
3216 constant's location in memory.
3217 Caller is responsible for updating the hash table. */
3219 static struct constant_descriptor_tree *
3220 build_constant_desc (tree exp)
3222 struct constant_descriptor_tree *desc;
3228 desc = ggc_alloc<constant_descriptor_tree> ();
3231 /* Create a string containing the label name, in LABEL. */
3232 labelno = const_labelno++;
3233 ASM_GENERATE_INTERNAL_LABEL (label, "LC", labelno);
3235 /* Construct the VAR_DECL associated with the constant. */
3236 decl = build_decl (UNKNOWN_LOCATION, VAR_DECL, get_identifier (label),
3238 DECL_ARTIFICIAL (decl) = 1;
3239 DECL_IGNORED_P (decl) = 1;
3240 TREE_READONLY (decl) = 1;
3241 TREE_STATIC (decl) = 1;
3242 TREE_ADDRESSABLE (decl) = 1;
3243 /* We don't set the RTL yet as this would cause varpool to assume that the
3244 variable is referenced. Moreover, it would just be dropped in LTO mode.
3245 Instead we set the flag that will be recognized in make_decl_rtl. */
3246 DECL_IN_CONSTANT_POOL (decl) = 1;
3247 DECL_INITIAL (decl) = desc->value;
3248 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3249 architectures so use DATA_ALIGNMENT as well, except for strings. */
3250 if (TREE_CODE (exp) == STRING_CST)
3252 DECL_ALIGN (decl) = CONSTANT_ALIGNMENT (exp, DECL_ALIGN (decl));
3255 align_variable (decl, 0);
3257 /* Now construct the SYMBOL_REF and the MEM. */
3258 if (use_object_blocks_p ())
3260 int align = (TREE_CODE (decl) == CONST_DECL
3261 || (TREE_CODE (decl) == VAR_DECL
3262 && DECL_IN_CONSTANT_POOL (decl))
3264 : symtab_node::get (decl)->definition_alignment ());
3265 section *sect = get_constant_section (exp, align);
3266 symbol = create_block_symbol (ggc_strdup (label),
3267 get_block_for_section (sect), -1);
3270 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3271 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3272 SET_SYMBOL_REF_DECL (symbol, decl);
3273 TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3275 rtl = gen_const_mem (TYPE_MODE (TREE_TYPE (exp)), symbol);
3276 set_mem_attributes (rtl, exp, 1);
3277 set_mem_alias_set (rtl, 0);
3279 /* Putting EXP into the literal pool might have imposed a different
3280 alignment which should be visible in the RTX as well. */
3281 set_mem_align (rtl, DECL_ALIGN (decl));
3283 /* We cannot share RTX'es in pool entries.
3284 Mark this piece of RTL as required for unsharing. */
3285 RTX_FLAG (rtl, used) = 1;
3287 /* Set flags or add text to the name to record information, such as
3288 that it is a local symbol. If the name is changed, the macro
3289 ASM_OUTPUT_LABELREF will have to know how to strip this
3290 information. This call might invalidate our local variable
3291 SYMBOL; we can't use it afterward. */
3292 targetm.encode_section_info (exp, rtl, true);
3299 /* Return an rtx representing a reference to constant data in memory
3300 for the constant expression EXP.
3302 If assembler code for such a constant has already been output,
3303 return an rtx to refer to it.
3304 Otherwise, output such a constant in memory
3305 and generate an rtx for it.
3307 If DEFER is nonzero, this constant can be deferred and output only
3308 if referenced in the function after all optimizations.
3310 `const_desc_table' records which constants already have label strings. */
3313 output_constant_def (tree exp, int defer)
3315 struct constant_descriptor_tree *desc;
3316 struct constant_descriptor_tree key;
3318 /* Look up EXP in the table of constant descriptors. If we didn't find
3319 it, create a new one. */
3321 key.hash = const_hash_1 (exp);
3322 constant_descriptor_tree **loc
3323 = const_desc_htab->find_slot_with_hash (&key, key.hash, INSERT);
3328 desc = build_constant_desc (exp);
3329 desc->hash = key.hash;
3333 maybe_output_constant_def_contents (desc, defer);
3337 /* Subroutine of output_constant_def: Decide whether or not we need to
3338 output the constant DESC now, and if so, do it. */
3340 maybe_output_constant_def_contents (struct constant_descriptor_tree *desc,
3343 rtx symbol = XEXP (desc->rtl, 0);
3344 tree exp = desc->value;
3346 if (flag_syntax_only)
3349 if (TREE_ASM_WRITTEN (exp))
3350 /* Already output; don't do it again. */
3353 /* We can always defer constants as long as the context allows
3357 /* Increment n_deferred_constants if it exists. It needs to be at
3358 least as large as the number of constants actually referred to
3359 by the function. If it's too small we'll stop looking too early
3360 and fail to emit constants; if it's too large we'll only look
3361 through the entire function when we could have stopped earlier. */
3363 n_deferred_constants++;
3367 output_constant_def_contents (symbol);
3370 /* Subroutine of output_constant_def_contents. Output the definition
3371 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3372 constant's alignment in bits. */
3375 assemble_constant_contents (tree exp, const char *label, unsigned int align)
3379 size = get_constant_size (exp);
3381 /* Do any machine/system dependent processing of the constant. */
3382 targetm.asm_out.declare_constant_name (asm_out_file, label, exp, size);
3384 /* Output the value of EXP. */
3385 output_constant (exp, size, align, false);
3387 targetm.asm_out.decl_end ();
3390 /* We must output the constant data referred to by SYMBOL; do so. */
3393 output_constant_def_contents (rtx symbol)
3395 tree decl = SYMBOL_REF_DECL (symbol);
3396 tree exp = DECL_INITIAL (decl);
3397 bool asan_protected = false;
3399 /* Make sure any other constants whose addresses appear in EXP
3400 are assigned label numbers. */
3401 output_addressed_constants (exp);
3403 /* We are no longer deferring this constant. */
3404 TREE_ASM_WRITTEN (decl) = TREE_ASM_WRITTEN (exp) = 1;
3406 if ((flag_sanitize & SANITIZE_ADDRESS)
3407 && TREE_CODE (exp) == STRING_CST
3408 && asan_protect_global (exp))
3410 asan_protected = true;
3411 DECL_ALIGN (decl) = MAX (DECL_ALIGN (decl),
3412 ASAN_RED_ZONE_SIZE * BITS_PER_UNIT);
3415 /* If the constant is part of an object block, make sure that the
3416 decl has been positioned within its block, but do not write out
3417 its definition yet. output_object_blocks will do that later. */
3418 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol) && SYMBOL_REF_BLOCK (symbol))
3419 place_block_symbol (symbol);
3422 int align = (TREE_CODE (decl) == CONST_DECL
3423 || (TREE_CODE (decl) == VAR_DECL
3424 && DECL_IN_CONSTANT_POOL (decl))
3426 : symtab_node::get (decl)->definition_alignment ());
3427 switch_to_section (get_constant_section (exp, align));
3428 if (align > BITS_PER_UNIT)
3429 ASM_OUTPUT_ALIGN (asm_out_file, floor_log2 (align / BITS_PER_UNIT));
3430 assemble_constant_contents (exp, XSTR (symbol, 0), align);
3433 HOST_WIDE_INT size = get_constant_size (exp);
3434 assemble_zeros (asan_red_zone_size (size));
3439 /* Look up EXP in the table of constant descriptors. Return the rtl
3440 if it has been emitted, else null. */
3443 lookup_constant_def (tree exp)
3445 struct constant_descriptor_tree key;
3448 key.hash = const_hash_1 (exp);
3449 constant_descriptor_tree *desc
3450 = const_desc_htab->find_with_hash (&key, key.hash);
3452 return (desc ? desc->rtl : NULL_RTX);
3455 /* Return a tree representing a reference to constant data in memory
3456 for the constant expression EXP.
3458 This is the counterpart of output_constant_def at the Tree level. */
3461 tree_output_constant_def (tree exp)
3463 struct constant_descriptor_tree *desc, key;
3466 /* Look up EXP in the table of constant descriptors. If we didn't find
3467 it, create a new one. */
3469 key.hash = const_hash_1 (exp);
3470 constant_descriptor_tree **loc
3471 = const_desc_htab->find_slot_with_hash (&key, key.hash, INSERT);
3476 desc = build_constant_desc (exp);
3477 desc->hash = key.hash;
3481 decl = SYMBOL_REF_DECL (XEXP (desc->rtl, 0));
3482 varpool_node::finalize_decl (decl);
3486 struct GTY((chain_next ("%h.next"), for_user)) constant_descriptor_rtx {
3487 struct constant_descriptor_rtx *next;
3491 HOST_WIDE_INT offset;
3499 struct const_rtx_desc_hasher : ggc_ptr_hash<constant_descriptor_rtx>
3501 static hashval_t hash (constant_descriptor_rtx *);
3502 static bool equal (constant_descriptor_rtx *, constant_descriptor_rtx *);
3505 /* Used in the hash tables to avoid outputting the same constant
3506 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3507 are output once per function, not once per file. */
3508 /* ??? Only a few targets need per-function constant pools. Most
3509 can use one per-file pool. Should add a targetm bit to tell the
3512 struct GTY(()) rtx_constant_pool {
3513 /* Pointers to first and last constant in pool, as ordered by offset. */
3514 struct constant_descriptor_rtx *first;
3515 struct constant_descriptor_rtx *last;
3517 /* Hash facility for making memory-constants from constant rtl-expressions.
3518 It is used on RISC machines where immediate integer arguments and
3519 constant addresses are restricted so that such constants must be stored
3521 hash_table<const_rtx_desc_hasher> *const_rtx_htab;
3523 /* Current offset in constant pool (does not include any
3524 machine-specific header). */
3525 HOST_WIDE_INT offset;
3528 /* Hash and compare functions for const_rtx_htab. */
3531 const_rtx_desc_hasher::hash (constant_descriptor_rtx *desc)
3537 const_rtx_desc_hasher::equal (constant_descriptor_rtx *x,
3538 constant_descriptor_rtx *y)
3540 if (x->mode != y->mode)
3542 return rtx_equal_p (x->constant, y->constant);
3545 /* Hash one component of a constant. */
3548 const_rtx_hash_1 (const_rtx x)
3550 unsigned HOST_WIDE_INT hwi;
3556 code = GET_CODE (x);
3557 mode = GET_MODE (x);
3558 h = (hashval_t) code * 1048573 + mode;
3567 int shift = sizeof (hashval_t) * CHAR_BIT;
3568 const int n = sizeof (HOST_WIDE_INT) / sizeof (hashval_t);
3570 h ^= (hashval_t) hwi;
3571 for (i = 1; i < n; ++i)
3574 h ^= (hashval_t) hwi;
3579 case CONST_WIDE_INT:
3580 hwi = GET_MODE_PRECISION (mode);
3582 for (i = 0; i < CONST_WIDE_INT_NUNITS (x); i++)
3583 hwi ^= CONST_WIDE_INT_ELT (x, i);
3588 if (TARGET_SUPPORTS_WIDE_INT == 0 && mode == VOIDmode)
3590 hwi = CONST_DOUBLE_LOW (x) ^ CONST_DOUBLE_HIGH (x);
3594 h ^= real_hash (CONST_DOUBLE_REAL_VALUE (x));
3598 h ^= fixed_hash (CONST_FIXED_VALUE (x));
3602 h ^= htab_hash_string (XSTR (x, 0));
3606 h = h * 251 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (x));
3610 case UNSPEC_VOLATILE:
3611 h = h * 251 + XINT (x, 1);
3621 /* Compute a hash value for X, which should be a constant. */
3624 const_rtx_hash (rtx x)
3627 subrtx_iterator::array_type array;
3628 FOR_EACH_SUBRTX (iter, array, x, ALL)
3629 h = h * 509 + const_rtx_hash_1 (*iter);
3634 /* Create and return a new rtx constant pool. */
3636 static struct rtx_constant_pool *
3637 create_constant_pool (void)
3639 struct rtx_constant_pool *pool;
3641 pool = ggc_alloc<rtx_constant_pool> ();
3642 pool->const_rtx_htab = hash_table<const_rtx_desc_hasher>::create_ggc (31);
3649 /* Initialize constant pool hashing for a new function. */
3652 init_varasm_status (void)
3654 crtl->varasm.pool = create_constant_pool ();
3655 crtl->varasm.deferred_constants = 0;
3658 /* Given a MINUS expression, simplify it if both sides
3659 include the same symbol. */
3662 simplify_subtraction (rtx x)
3664 rtx r = simplify_rtx (x);
3668 /* Given a constant rtx X, make (or find) a memory constant for its value
3669 and return a MEM rtx to refer to it in memory. */
3672 force_const_mem (machine_mode mode, rtx x)
3674 struct constant_descriptor_rtx *desc, tmp;
3675 struct rtx_constant_pool *pool;
3680 constant_descriptor_rtx **slot;
3682 /* If we're not allowed to drop X into the constant pool, don't. */
3683 if (targetm.cannot_force_const_mem (mode, x))
3686 /* Record that this function has used a constant pool entry. */
3687 crtl->uses_const_pool = 1;
3689 /* Decide which pool to use. */
3690 pool = (targetm.use_blocks_for_constant_p (mode, x)
3691 ? shared_constant_pool
3692 : crtl->varasm.pool);
3694 /* Lookup the value in the hashtable. */
3697 hash = const_rtx_hash (x);
3698 slot = pool->const_rtx_htab->find_slot_with_hash (&tmp, hash, INSERT);
3701 /* If the constant was already present, return its memory. */
3703 return copy_rtx (desc->mem);
3705 /* Otherwise, create a new descriptor. */
3706 desc = ggc_alloc<constant_descriptor_rtx> ();
3709 /* Align the location counter as required by EXP's data type. */
3710 align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
3712 tree type = lang_hooks.types.type_for_mode (mode, 0);
3713 if (type != NULL_TREE)
3714 align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
3716 pool->offset += (align / BITS_PER_UNIT) - 1;
3717 pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
3720 desc->constant = copy_rtx (tmp.constant);
3721 desc->offset = pool->offset;
3724 desc->align = align;
3725 desc->labelno = const_labelno;
3728 pool->offset += GET_MODE_SIZE (mode);
3730 pool->last->next = desc;
3732 pool->first = pool->last = desc;
3735 /* Create a string containing the label name, in LABEL. */
3736 ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
3739 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3740 the constants pool. */
3741 if (use_object_blocks_p () && targetm.use_blocks_for_constant_p (mode, x))
3743 section *sect = targetm.asm_out.select_rtx_section (mode, x, align);
3744 symbol = create_block_symbol (ggc_strdup (label),
3745 get_block_for_section (sect), -1);
3748 symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
3750 SYMBOL_REF_FLAGS (symbol) |= SYMBOL_FLAG_LOCAL;
3751 CONSTANT_POOL_ADDRESS_P (symbol) = 1;
3752 SET_SYMBOL_REF_CONSTANT (symbol, desc);
3754 /* Construct the MEM. */
3755 desc->mem = def = gen_const_mem (mode, symbol);
3756 set_mem_attributes (def, lang_hooks.types.type_for_mode (mode, 0), 1);
3757 set_mem_align (def, align);
3759 /* If we're dropping a label to the constant pool, make sure we
3761 if (GET_CODE (x) == LABEL_REF)
3762 LABEL_PRESERVE_P (XEXP (x, 0)) = 1;
3764 return copy_rtx (def);
3767 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3770 get_pool_constant (const_rtx addr)
3772 return SYMBOL_REF_CONSTANT (addr)->constant;
3775 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3776 and whether it has been output or not. */
3779 get_pool_constant_mark (rtx addr, bool *pmarked)
3781 struct constant_descriptor_rtx *desc;
3783 desc = SYMBOL_REF_CONSTANT (addr);
3784 *pmarked = (desc->mark != 0);
3785 return desc->constant;
3788 /* Similar, return the mode. */
3791 get_pool_mode (const_rtx addr)
3793 return SYMBOL_REF_CONSTANT (addr)->mode;
3796 /* Return the size of the constant pool. */
3799 get_pool_size (void)
3801 return crtl->varasm.pool->offset;
3804 /* Worker function for output_constant_pool_1. Emit assembly for X
3805 in MODE with known alignment ALIGN. */
3808 output_constant_pool_2 (machine_mode mode, rtx x, unsigned int align)
3810 switch (GET_MODE_CLASS (mode))
3813 case MODE_DECIMAL_FLOAT:
3815 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x));
3816 assemble_real (*CONST_DOUBLE_REAL_VALUE (x), mode, align, false);
3821 case MODE_PARTIAL_INT:
3826 case MODE_POINTER_BOUNDS:
3827 assemble_integer (x, GET_MODE_SIZE (mode), align, 1);
3830 case MODE_VECTOR_FLOAT:
3831 case MODE_VECTOR_INT:
3832 case MODE_VECTOR_FRACT:
3833 case MODE_VECTOR_UFRACT:
3834 case MODE_VECTOR_ACCUM:
3835 case MODE_VECTOR_UACCUM:
3838 machine_mode submode = GET_MODE_INNER (mode);
3839 unsigned int subalign = MIN (align, GET_MODE_BITSIZE (submode));
3841 gcc_assert (GET_CODE (x) == CONST_VECTOR);
3842 units = CONST_VECTOR_NUNITS (x);
3844 for (i = 0; i < units; i++)
3846 rtx elt = CONST_VECTOR_ELT (x, i);
3847 output_constant_pool_2 (submode, elt, i ? subalign : align);
3857 /* Worker function for output_constant_pool. Emit constant DESC,
3858 giving it ALIGN bits of alignment. */
3861 output_constant_pool_1 (struct constant_descriptor_rtx *desc,
3868 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3869 whose CODE_LABEL has been deleted. This can occur if a jump table
3870 is eliminated by optimization. If so, write a constant of zero
3871 instead. Note that this can also happen by turning the
3872 CODE_LABEL into a NOTE. */
3873 /* ??? This seems completely and utterly wrong. Certainly it's
3874 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3875 functioning even with rtx_insn::deleted and friends. */
3878 switch (GET_CODE (tmp))
3881 if (GET_CODE (XEXP (tmp, 0)) != PLUS
3882 || GET_CODE (XEXP (XEXP (tmp, 0), 0)) != LABEL_REF)
3884 tmp = XEXP (XEXP (tmp, 0), 0);
3888 tmp = LABEL_REF_LABEL (tmp);
3889 gcc_assert (!as_a<rtx_insn *> (tmp)->deleted ());
3890 gcc_assert (!NOTE_P (tmp)
3891 || NOTE_KIND (tmp) != NOTE_INSN_DELETED);
3898 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3899 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file, x, desc->mode,
3900 align, desc->labelno, done);
3903 assemble_align (align);
3905 /* Output the label. */
3906 targetm.asm_out.internal_label (asm_out_file, "LC", desc->labelno);
3909 Pass actual alignment value while emitting string constant to asm code
3910 as function 'output_constant_pool_1' explicitly passes the alignment as 1
3911 assuming that the data is already aligned which prevents the generation
3912 of fix-up table entries. */
3913 output_constant_pool_2 (desc->mode, x, desc->align);
3915 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3916 sections have proper size. */
3917 if (align > GET_MODE_BITSIZE (desc->mode)
3919 && (in_section->common.flags & SECTION_MERGE))
3920 assemble_align (align);
3922 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3928 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3929 Emit referenced deferred strings. */
3932 mark_constants_in_pattern (rtx insn)
3934 subrtx_iterator::array_type array;
3935 FOR_EACH_SUBRTX (iter, array, PATTERN (insn), ALL)
3937 const_rtx x = *iter;
3938 if (GET_CODE (x) == SYMBOL_REF)
3940 if (CONSTANT_POOL_ADDRESS_P (x))
3942 struct constant_descriptor_rtx *desc = SYMBOL_REF_CONSTANT (x);
3943 if (desc->mark == 0)
3946 iter.substitute (desc->constant);
3949 else if (TREE_CONSTANT_POOL_ADDRESS_P (x))
3951 tree decl = SYMBOL_REF_DECL (x);
3952 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl)))
3954 n_deferred_constants--;
3955 output_constant_def_contents (CONST_CAST_RTX (x));
3962 /* Look through appropriate parts of INSN, marking all entries in the
3963 constant pool which are actually being used. Entries that are only
3964 referenced by other constants are also marked as used. Emit
3965 deferred strings that are used. */
3968 mark_constants (rtx_insn *insn)
3973 /* Insns may appear inside a SEQUENCE. Only check the patterns of
3974 insns, not any notes that may be attached. We don't want to mark
3975 a constant just because it happens to appear in a REG_EQUIV note. */
3976 if (rtx_sequence *seq = dyn_cast <rtx_sequence *> (PATTERN (insn)))
3978 int i, n = seq->len ();
3979 for (i = 0; i < n; ++i)
3981 rtx subinsn = seq->element (i);
3982 if (INSN_P (subinsn))
3983 mark_constants_in_pattern (subinsn);
3987 mark_constants_in_pattern (insn);
3990 /* Look through the instructions for this function, and mark all the
3991 entries in POOL which are actually being used. Emit deferred constants
3992 which have indeed been used. */
3995 mark_constant_pool (void)
3999 if (!crtl->uses_const_pool && n_deferred_constants == 0)
4002 for (insn = get_insns (); insn; insn = NEXT_INSN (insn))
4003 mark_constants (insn);
4006 /* Write all the constants in POOL. */
4009 output_constant_pool_contents (struct rtx_constant_pool *pool)
4011 struct constant_descriptor_rtx *desc;
4013 for (desc = pool->first; desc ; desc = desc->next)
4016 /* If the constant is part of an object_block, make sure that
4017 the constant has been positioned within its block, but do not
4018 write out its definition yet. output_object_blocks will do
4020 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc->sym)
4021 && SYMBOL_REF_BLOCK (desc->sym))
4022 place_block_symbol (desc->sym);
4025 switch_to_section (targetm.asm_out.select_rtx_section
4026 (desc->mode, desc->constant, desc->align));
4027 output_constant_pool_1 (desc, desc->align);
4032 /* Mark all constants that are used in the current function, then write
4033 out the function's private constant pool. */
4036 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
4037 tree fndecl ATTRIBUTE_UNUSED)
4039 struct rtx_constant_pool *pool = crtl->varasm.pool;
4041 /* It is possible for gcc to call force_const_mem and then to later
4042 discard the instructions which refer to the constant. In such a
4043 case we do not need to output the constant. */
4044 mark_constant_pool ();
4046 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4047 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
4050 output_constant_pool_contents (pool);
4052 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4053 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file, fnname, fndecl, pool->offset);
4057 /* Write the contents of the shared constant pool. */
4060 output_shared_constant_pool (void)
4062 output_constant_pool_contents (shared_constant_pool);
4065 /* Determine what kind of relocations EXP may need. */
4068 compute_reloc_for_constant (tree exp)
4070 int reloc = 0, reloc2;
4073 switch (TREE_CODE (exp))
4077 /* Go inside any operations that get_inner_reference can handle and see
4078 if what's inside is a constant: no need to do anything here for
4079 addresses of variables or functions. */
4080 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
4081 tem = TREE_OPERAND (tem, 0))
4084 if (TREE_CODE (tem) == MEM_REF
4085 && TREE_CODE (TREE_OPERAND (tem, 0)) == ADDR_EXPR)
4087 reloc = compute_reloc_for_constant (TREE_OPERAND (tem, 0));
4091 if (!targetm.binds_local_p (tem))
4098 case POINTER_PLUS_EXPR:
4099 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4100 reloc |= compute_reloc_for_constant (TREE_OPERAND (exp, 1));
4104 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4105 reloc2 = compute_reloc_for_constant (TREE_OPERAND (exp, 1));
4106 /* The difference of two local labels is computable at link time. */
4107 if (reloc == 1 && reloc2 == 1)
4114 case VIEW_CONVERT_EXPR:
4115 reloc = compute_reloc_for_constant (TREE_OPERAND (exp, 0));
4120 unsigned HOST_WIDE_INT idx;
4121 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4123 reloc |= compute_reloc_for_constant (tem);
4133 /* Find all the constants whose addresses are referenced inside of EXP,
4134 and make sure assembler code with a label has been output for each one.
4135 Indicate whether an ADDR_EXPR has been encountered. */
4138 output_addressed_constants (tree exp)
4142 switch (TREE_CODE (exp))
4146 /* Go inside any operations that get_inner_reference can handle and see
4147 if what's inside is a constant: no need to do anything here for
4148 addresses of variables or functions. */
4149 for (tem = TREE_OPERAND (exp, 0); handled_component_p (tem);
4150 tem = TREE_OPERAND (tem, 0))
4153 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4154 if (TREE_CODE (tem) == CONST_DECL && DECL_INITIAL (tem))
4155 tem = DECL_INITIAL (tem);
4157 if (CONSTANT_CLASS_P (tem) || TREE_CODE (tem) == CONSTRUCTOR)
4158 output_constant_def (tem, 0);
4160 if (TREE_CODE (tem) == MEM_REF)
4161 output_addressed_constants (TREE_OPERAND (tem, 0));
4165 case POINTER_PLUS_EXPR:
4167 output_addressed_constants (TREE_OPERAND (exp, 1));
4171 case VIEW_CONVERT_EXPR:
4172 output_addressed_constants (TREE_OPERAND (exp, 0));
4177 unsigned HOST_WIDE_INT idx;
4178 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), idx, tem)
4180 output_addressed_constants (tem);
4189 /* Whether a constructor CTOR is a valid static constant initializer if all
4190 its elements are. This used to be internal to initializer_constant_valid_p
4191 and has been exposed to let other functions like categorize_ctor_elements
4192 evaluate the property while walking a constructor for other purposes. */
4195 constructor_static_from_elts_p (const_tree ctor)
4197 return (TREE_CONSTANT (ctor)
4198 && (TREE_CODE (TREE_TYPE (ctor)) == UNION_TYPE
4199 || TREE_CODE (TREE_TYPE (ctor)) == RECORD_TYPE
4200 || TREE_CODE (TREE_TYPE (ctor)) == ARRAY_TYPE));
4203 static tree initializer_constant_valid_p_1 (tree value, tree endtype,
4206 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4207 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4208 which are valid when ENDTYPE is an integer of any size; in
4209 particular, this does not accept a pointer minus a constant. This
4210 returns null_pointer_node if the VALUE is an absolute constant
4211 which can be used to initialize a static variable. Otherwise it
4215 narrowing_initializer_constant_valid_p (tree value, tree endtype, tree *cache)
4219 if (!INTEGRAL_TYPE_P (endtype))
4222 op0 = TREE_OPERAND (value, 0);
4223 op1 = TREE_OPERAND (value, 1);
4225 /* Like STRIP_NOPS except allow the operand mode to widen. This
4226 works around a feature of fold that simplifies (int)(p1 - p2) to
4227 ((int)p1 - (int)p2) under the theory that the narrower operation
4230 while (CONVERT_EXPR_P (op0)
4231 || TREE_CODE (op0) == NON_LVALUE_EXPR)
4233 tree inner = TREE_OPERAND (op0, 0);
4234 if (inner == error_mark_node
4235 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4236 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0)))
4237 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4242 while (CONVERT_EXPR_P (op1)
4243 || TREE_CODE (op1) == NON_LVALUE_EXPR)
4245 tree inner = TREE_OPERAND (op1, 0);
4246 if (inner == error_mark_node
4247 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner)))
4248 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1)))
4249 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner)))))
4254 op0 = initializer_constant_valid_p_1 (op0, endtype, cache);
4258 op1 = initializer_constant_valid_p_1 (op1, endtype,
4259 cache ? cache + 2 : NULL);
4260 /* Both initializers must be known. */
4264 && (op0 == null_pointer_node
4265 || TREE_CODE (value) == MINUS_EXPR))
4266 return null_pointer_node;
4268 /* Support differences between labels. */
4269 if (TREE_CODE (op0) == LABEL_DECL
4270 && TREE_CODE (op1) == LABEL_DECL)
4271 return null_pointer_node;
4273 if (TREE_CODE (op0) == STRING_CST
4274 && TREE_CODE (op1) == STRING_CST
4275 && operand_equal_p (op0, op1, 1))
4276 return null_pointer_node;
4282 /* Helper function of initializer_constant_valid_p.
4283 Return nonzero if VALUE is a valid constant-valued expression
4284 for use in initializing a static variable; one that can be an
4285 element of a "constant" initializer.
4287 Return null_pointer_node if the value is absolute;
4288 if it is relocatable, return the variable that determines the relocation.
4289 We assume that VALUE has been folded as much as possible;
4290 therefore, we do not need to check for such things as
4291 arithmetic-combinations of integers.
4293 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4296 initializer_constant_valid_p_1 (tree value, tree endtype, tree *cache)
4300 switch (TREE_CODE (value))
4303 if (constructor_static_from_elts_p (value))
4305 unsigned HOST_WIDE_INT idx;
4307 bool absolute = true;
4309 if (cache && cache[0] == value)
4311 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4314 reloc = initializer_constant_valid_p_1 (elt, TREE_TYPE (elt),
4317 /* An absolute value is required with reverse SSO. */
4318 || (reloc != null_pointer_node
4319 && TYPE_REVERSE_STORAGE_ORDER (TREE_TYPE (value))
4320 && !AGGREGATE_TYPE_P (TREE_TYPE (elt))))
4325 cache[1] = NULL_TREE;
4329 if (reloc != null_pointer_node)
4332 /* For a non-absolute relocation, there is no single
4333 variable that can be "the variable that determines the
4338 cache[1] = absolute ? null_pointer_node : error_mark_node;
4340 return absolute ? null_pointer_node : error_mark_node;
4343 return TREE_STATIC (value) ? null_pointer_node : NULL_TREE;
4351 return null_pointer_node;
4356 tree op0 = staticp (TREE_OPERAND (value, 0));
4359 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4360 to be a constant, this is old-skool offsetof-like nonsense. */
4361 if (TREE_CODE (op0) == INDIRECT_REF
4362 && TREE_CONSTANT (TREE_OPERAND (op0, 0)))
4363 return null_pointer_node;
4364 /* Taking the address of a nested function involves a trampoline,
4365 unless we don't need or want one. */
4366 if (TREE_CODE (op0) == FUNCTION_DECL
4367 && DECL_STATIC_CHAIN (op0)
4368 && !TREE_NO_TRAMPOLINE (value))
4370 /* "&{...}" requires a temporary to hold the constructed
4372 if (TREE_CODE (op0) == CONSTRUCTOR)
4378 case NON_LVALUE_EXPR:
4379 return initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4382 case VIEW_CONVERT_EXPR:
4384 tree src = TREE_OPERAND (value, 0);
4385 tree src_type = TREE_TYPE (src);
4386 tree dest_type = TREE_TYPE (value);
4388 /* Allow view-conversions from aggregate to non-aggregate type only
4389 if the bit pattern is fully preserved afterwards; otherwise, the
4390 RTL expander won't be able to apply a subsequent transformation
4391 to the underlying constructor. */
4392 if (AGGREGATE_TYPE_P (src_type) && !AGGREGATE_TYPE_P (dest_type))
4394 if (TYPE_MODE (endtype) == TYPE_MODE (dest_type))
4395 return initializer_constant_valid_p_1 (src, endtype, cache);
4400 /* Allow all other kinds of view-conversion. */
4401 return initializer_constant_valid_p_1 (src, endtype, cache);
4406 tree src = TREE_OPERAND (value, 0);
4407 tree src_type = TREE_TYPE (src);
4408 tree dest_type = TREE_TYPE (value);
4410 /* Allow conversions between pointer types, floating-point
4411 types, and offset types. */
4412 if ((POINTER_TYPE_P (dest_type) && POINTER_TYPE_P (src_type))
4413 || (FLOAT_TYPE_P (dest_type) && FLOAT_TYPE_P (src_type))
4414 || (TREE_CODE (dest_type) == OFFSET_TYPE
4415 && TREE_CODE (src_type) == OFFSET_TYPE))
4416 return initializer_constant_valid_p_1 (src, endtype, cache);
4418 /* Allow length-preserving conversions between integer types. */
4419 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type)
4420 && (TYPE_PRECISION (dest_type) == TYPE_PRECISION (src_type)))
4421 return initializer_constant_valid_p_1 (src, endtype, cache);
4423 /* Allow conversions between other integer types only if
4425 if (INTEGRAL_TYPE_P (dest_type) && INTEGRAL_TYPE_P (src_type))
4427 tree inner = initializer_constant_valid_p_1 (src, endtype, cache);
4428 if (inner == null_pointer_node)
4429 return null_pointer_node;
4433 /* Allow (int) &foo provided int is as wide as a pointer. */
4434 if (INTEGRAL_TYPE_P (dest_type) && POINTER_TYPE_P (src_type)
4435 && (TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type)))
4436 return initializer_constant_valid_p_1 (src, endtype, cache);
4438 /* Likewise conversions from int to pointers, but also allow
4439 conversions from 0. */
4440 if ((POINTER_TYPE_P (dest_type)
4441 || TREE_CODE (dest_type) == OFFSET_TYPE)
4442 && INTEGRAL_TYPE_P (src_type))
4444 if (TREE_CODE (src) == INTEGER_CST
4445 && TYPE_PRECISION (dest_type) >= TYPE_PRECISION (src_type))
4446 return null_pointer_node;
4447 if (integer_zerop (src))
4448 return null_pointer_node;
4449 else if (TYPE_PRECISION (dest_type) <= TYPE_PRECISION (src_type))
4450 return initializer_constant_valid_p_1 (src, endtype, cache);
4453 /* Allow conversions to struct or union types if the value
4455 if (TREE_CODE (dest_type) == RECORD_TYPE
4456 || TREE_CODE (dest_type) == UNION_TYPE)
4457 return initializer_constant_valid_p_1 (src, endtype, cache);
4461 case POINTER_PLUS_EXPR:
4463 /* Any valid floating-point constants will have been folded by now;
4464 with -frounding-math we hit this with addition of two constants. */
4465 if (TREE_CODE (endtype) == REAL_TYPE)
4467 if (cache && cache[0] == value)
4469 if (! INTEGRAL_TYPE_P (endtype)
4470 || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
4472 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4474 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4477 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4478 endtype, ncache + 2);
4479 /* If either term is absolute, use the other term's relocation. */
4480 if (valid0 == null_pointer_node)
4482 else if (valid1 == null_pointer_node)
4484 /* Support narrowing pointer differences. */
4486 ret = narrowing_initializer_constant_valid_p (value, endtype,
4490 /* Support narrowing pointer differences. */
4491 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4500 if (TREE_CODE (endtype) == REAL_TYPE)
4502 if (cache && cache[0] == value)
4504 if (! INTEGRAL_TYPE_P (endtype)
4505 || TYPE_PRECISION (endtype) >= TYPE_PRECISION (TREE_TYPE (value)))
4507 tree ncache[4] = { NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE };
4509 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 0),
4512 = initializer_constant_valid_p_1 (TREE_OPERAND (value, 1),
4513 endtype, ncache + 2);
4514 /* Win if second argument is absolute. */
4515 if (valid1 == null_pointer_node)
4517 /* Win if both arguments have the same relocation.
4518 Then the value is absolute. */
4519 else if (valid0 == valid1 && valid0 != 0)
4520 ret = null_pointer_node;
4521 /* Since GCC guarantees that string constants are unique in the
4522 generated code, a subtraction between two copies of the same
4523 constant string is absolute. */
4524 else if (valid0 && TREE_CODE (valid0) == STRING_CST
4525 && valid1 && TREE_CODE (valid1) == STRING_CST
4526 && operand_equal_p (valid0, valid1, 1))
4527 ret = null_pointer_node;
4528 /* Support narrowing differences. */
4530 ret = narrowing_initializer_constant_valid_p (value, endtype,
4534 /* Support narrowing differences. */
4535 ret = narrowing_initializer_constant_valid_p (value, endtype, NULL);
4550 /* Return nonzero if VALUE is a valid constant-valued expression
4551 for use in initializing a static variable; one that can be an
4552 element of a "constant" initializer.
4554 Return null_pointer_node if the value is absolute;
4555 if it is relocatable, return the variable that determines the relocation.
4556 We assume that VALUE has been folded as much as possible;
4557 therefore, we do not need to check for such things as
4558 arithmetic-combinations of integers. */
4560 initializer_constant_valid_p (tree value, tree endtype, bool reverse)
4562 tree reloc = initializer_constant_valid_p_1 (value, endtype, NULL);
4564 /* An absolute value is required with reverse storage order. */
4566 && reloc != null_pointer_node
4568 && !AGGREGATE_TYPE_P (endtype)
4569 && !VECTOR_TYPE_P (endtype))
4575 /* Return true if VALUE is a valid constant-valued expression
4576 for use in initializing a static bit-field; one that can be
4577 an element of a "constant" initializer. */
4580 initializer_constant_valid_for_bitfield_p (tree value)
4582 /* For bitfields we support integer constants or possibly nested aggregates
4584 switch (TREE_CODE (value))
4588 unsigned HOST_WIDE_INT idx;
4591 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value), idx, elt)
4592 if (!initializer_constant_valid_for_bitfield_p (elt))
4601 case VIEW_CONVERT_EXPR:
4602 case NON_LVALUE_EXPR:
4604 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value, 0));
4613 /* output_constructor outer state of relevance in recursive calls, typically
4614 for nested aggregate bitfields. */
4616 struct oc_outer_state {
4617 unsigned int bit_offset; /* current position in ... */
4618 int byte; /* ... the outer byte buffer. */
4621 static unsigned HOST_WIDE_INT
4622 output_constructor (tree, unsigned HOST_WIDE_INT, unsigned int, bool,
4625 /* Output assembler code for constant EXP, with no label.
4626 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4627 Assumes output_addressed_constants has been done on EXP already.
4629 Generate at least SIZE bytes of assembler data, padding at the end
4630 with zeros if necessary. SIZE must always be specified. The returned
4631 value is the actual number of bytes of assembler data generated, which
4632 may be bigger than SIZE if the object contains a variable length field.
4634 SIZE is important for structure constructors,
4635 since trailing members may have been omitted from the constructor.
4636 It is also important for initialization of arrays from string constants
4637 since the full length of the string constant might not be wanted.
4638 It is also needed for initialization of unions, where the initializer's
4639 type is just one member, and that may not be as long as the union.
4641 There a case in which we would fail to output exactly SIZE bytes:
4642 for a structure constructor that wants to produce more than SIZE bytes.
4643 But such constructors will never be generated for any possible input.
4645 ALIGN is the alignment of the data in bits.
4647 If REVERSE is true, EXP is output in reverse storage order. */
4649 static unsigned HOST_WIDE_INT
4650 output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align,
4653 enum tree_code code;
4654 unsigned HOST_WIDE_INT thissize;
4657 if (size == 0 || flag_syntax_only)
4660 /* See if we're trying to initialize a pointer in a non-default mode
4661 to the address of some declaration somewhere. If the target says
4662 the mode is valid for pointers, assume the target has a way of
4664 if (TREE_CODE (exp) == NOP_EXPR
4665 && POINTER_TYPE_P (TREE_TYPE (exp))
4666 && targetm.addr_space.valid_pointer_mode
4667 (TYPE_MODE (TREE_TYPE (exp)),
4668 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)))))
4670 tree saved_type = TREE_TYPE (exp);
4672 /* Peel off any intermediate conversions-to-pointer for valid
4674 while (TREE_CODE (exp) == NOP_EXPR
4675 && POINTER_TYPE_P (TREE_TYPE (exp))
4676 && targetm.addr_space.valid_pointer_mode
4677 (TYPE_MODE (TREE_TYPE (exp)),
4678 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp)))))
4679 exp = TREE_OPERAND (exp, 0);
4681 /* If what we're left with is the address of something, we can
4682 convert the address to the final type and output it that
4684 if (TREE_CODE (exp) == ADDR_EXPR)
4685 exp = build1 (ADDR_EXPR, saved_type, TREE_OPERAND (exp, 0));
4686 /* Likewise for constant ints. */
4687 else if (TREE_CODE (exp) == INTEGER_CST)
4688 exp = fold_convert (saved_type, exp);
4692 /* Eliminate any conversions since we'll be outputting the underlying
4694 while (CONVERT_EXPR_P (exp)
4695 || TREE_CODE (exp) == NON_LVALUE_EXPR
4696 || TREE_CODE (exp) == VIEW_CONVERT_EXPR)
4698 HOST_WIDE_INT type_size = int_size_in_bytes (TREE_TYPE (exp));
4699 HOST_WIDE_INT op_size = int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp, 0)));
4701 /* Make sure eliminating the conversion is really a no-op, except with
4702 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4703 union types to allow for Ada unchecked unions. */
4704 if (type_size > op_size
4705 && TREE_CODE (exp) != VIEW_CONVERT_EXPR
4706 && TREE_CODE (TREE_TYPE (exp)) != UNION_TYPE)
4707 /* Keep the conversion. */
4710 exp = TREE_OPERAND (exp, 0);
4713 code = TREE_CODE (TREE_TYPE (exp));
4714 thissize = int_size_in_bytes (TREE_TYPE (exp));
4716 /* Allow a constructor with no elements for any data type.
4717 This means to fill the space with zeros. */
4718 if (TREE_CODE (exp) == CONSTRUCTOR
4719 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp)))
4721 assemble_zeros (size);
4725 if (TREE_CODE (exp) == FDESC_EXPR)
4727 #ifdef ASM_OUTPUT_FDESC
4728 HOST_WIDE_INT part = tree_to_shwi (TREE_OPERAND (exp, 1));
4729 tree decl = TREE_OPERAND (exp, 0);
4730 ASM_OUTPUT_FDESC (asm_out_file, decl, part);
4737 /* Now output the underlying data. If we've handling the padding, return.
4738 Otherwise, break and ensure SIZE is the size written. */
4745 case REFERENCE_TYPE:
4747 case FIXED_POINT_TYPE:
4748 case POINTER_BOUNDS_TYPE:
4750 cst = expand_expr (exp, NULL_RTX, VOIDmode, EXPAND_INITIALIZER);
4752 cst = flip_storage_order (TYPE_MODE (TREE_TYPE (exp)), cst);
4753 if (!assemble_integer (cst, MIN (size, thissize), align, 0))
4754 error ("initializer for integer/fixed-point value is too complicated");
4758 if (TREE_CODE (exp) != REAL_CST)
4759 error ("initializer for floating value is not a floating constant");
4761 assemble_real (TREE_REAL_CST (exp), TYPE_MODE (TREE_TYPE (exp)),
4766 output_constant (TREE_REALPART (exp), thissize / 2, align, reverse);
4767 output_constant (TREE_IMAGPART (exp), thissize / 2,
4768 min_align (align, BITS_PER_UNIT * (thissize / 2)),
4774 switch (TREE_CODE (exp))
4777 return output_constructor (exp, size, align, reverse, NULL);
4780 = MIN ((unsigned HOST_WIDE_INT)TREE_STRING_LENGTH (exp), size);
4781 assemble_string (TREE_STRING_POINTER (exp), thissize);
4785 machine_mode inner = TYPE_MODE (TREE_TYPE (TREE_TYPE (exp)));
4786 unsigned int nalign = MIN (align, GET_MODE_ALIGNMENT (inner));
4787 int elt_size = GET_MODE_SIZE (inner);
4788 output_constant (VECTOR_CST_ELT (exp, 0), elt_size, align,
4790 thissize = elt_size;
4791 for (unsigned int i = 1; i < VECTOR_CST_NELTS (exp); i++)
4793 output_constant (VECTOR_CST_ELT (exp, i), elt_size, nalign,
4795 thissize += elt_size;
4806 gcc_assert (TREE_CODE (exp) == CONSTRUCTOR);
4807 return output_constructor (exp, size, align, reverse, NULL);
4816 if (size > thissize)
4817 assemble_zeros (size - thissize);
4822 /* Subroutine of output_constructor, used for computing the size of
4823 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4824 type with an unspecified upper bound. */
4826 static unsigned HOST_WIDE_INT
4827 array_size_for_constructor (tree val)
4830 unsigned HOST_WIDE_INT cnt;
4831 tree index, value, tmp;
4834 /* This code used to attempt to handle string constants that are not
4835 arrays of single-bytes, but nothing else does, so there's no point in
4837 if (TREE_CODE (val) == STRING_CST)
4838 return TREE_STRING_LENGTH (val);
4840 max_index = NULL_TREE;
4841 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val), cnt, index, value)
4843 if (TREE_CODE (index) == RANGE_EXPR)
4844 index = TREE_OPERAND (index, 1);
4845 if (max_index == NULL_TREE || tree_int_cst_lt (max_index, index))
4849 if (max_index == NULL_TREE)
4852 /* Compute the total number of array elements. */
4853 tmp = TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val)));
4854 i = wi::to_offset (max_index) - wi::to_offset (tmp) + 1;
4856 /* Multiply by the array element unit size to find number of bytes. */
4857 i *= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val))));
4859 gcc_assert (wi::fits_uhwi_p (i));
4860 return i.to_uhwi ();
4863 /* Other datastructures + helpers for output_constructor. */
4865 /* output_constructor local state to support interaction with helpers. */
4867 struct oc_local_state {
4869 /* Received arguments. */
4870 tree exp; /* Constructor expression. */
4871 tree type; /* Type of constructor expression. */
4872 unsigned HOST_WIDE_INT size; /* # bytes to output - pad if necessary. */
4873 unsigned int align; /* Known initial alignment. */
4874 tree min_index; /* Lower bound if specified for an array. */
4876 /* Output processing state. */
4877 HOST_WIDE_INT total_bytes; /* # bytes output so far / current position. */
4878 int byte; /* Part of a bitfield byte yet to be output. */
4879 int last_relative_index; /* Implicit or explicit index of the last
4880 array element output within a bitfield. */
4881 bool byte_buffer_in_use; /* Whether BYTE is in use. */
4882 bool reverse; /* Whether reverse storage order is in use. */
4884 /* Current element. */
4885 tree field; /* Current field decl in a record. */
4886 tree val; /* Current element value. */
4887 tree index; /* Current element index. */
4891 /* Helper for output_constructor. From the current LOCAL state, output a
4892 RANGE_EXPR element. */
4895 output_constructor_array_range (oc_local_state *local)
4897 unsigned HOST_WIDE_INT fieldsize
4898 = int_size_in_bytes (TREE_TYPE (local->type));
4900 HOST_WIDE_INT lo_index
4901 = tree_to_shwi (TREE_OPERAND (local->index, 0));
4902 HOST_WIDE_INT hi_index
4903 = tree_to_shwi (TREE_OPERAND (local->index, 1));
4904 HOST_WIDE_INT index;
4907 = min_align (local->align, fieldsize * BITS_PER_UNIT);
4909 for (index = lo_index; index <= hi_index; index++)
4911 /* Output the element's initial value. */
4912 if (local->val == NULL_TREE)
4913 assemble_zeros (fieldsize);
4916 = output_constant (local->val, fieldsize, align2, local->reverse);
4918 /* Count its size. */
4919 local->total_bytes += fieldsize;
4923 /* Helper for output_constructor. From the current LOCAL state, output a
4924 field element that is not true bitfield or part of an outer one. */
4927 output_constructor_regular_field (oc_local_state *local)
4929 /* Field size and position. Since this structure is static, we know the
4930 positions are constant. */
4931 unsigned HOST_WIDE_INT fieldsize;
4932 HOST_WIDE_INT fieldpos;
4934 unsigned int align2;
4936 /* Output any buffered-up bit-fields preceding this element. */
4937 if (local->byte_buffer_in_use)
4939 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
4940 local->total_bytes++;
4941 local->byte_buffer_in_use = false;
4944 if (local->index != NULL_TREE)
4946 /* Perform the index calculation in modulo arithmetic but
4947 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4948 but we are using an unsigned sizetype. */
4949 unsigned prec = TYPE_PRECISION (sizetype);
4950 offset_int idx = wi::sext (wi::to_offset (local->index)
4951 - wi::to_offset (local->min_index), prec);
4952 fieldpos = (idx * wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local->val))))
4955 else if (local->field != NULL_TREE)
4956 fieldpos = int_byte_position (local->field);
4960 /* Advance to offset of this element.
4961 Note no alignment needed in an array, since that is guaranteed
4962 if each element has the proper size. */
4963 if (local->field != NULL_TREE || local->index != NULL_TREE)
4965 if (fieldpos > local->total_bytes)
4967 assemble_zeros (fieldpos - local->total_bytes);
4968 local->total_bytes = fieldpos;
4971 /* Must not go backwards. */
4972 gcc_assert (fieldpos == local->total_bytes);
4975 /* Find the alignment of this element. */
4976 align2 = min_align (local->align, BITS_PER_UNIT * fieldpos);
4978 /* Determine size this element should occupy. */
4983 /* If this is an array with an unspecified upper bound,
4984 the initializer determines the size. */
4985 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
4986 but we cannot do this until the deprecated support for
4987 initializing zero-length array members is removed. */
4988 if (TREE_CODE (TREE_TYPE (local->field)) == ARRAY_TYPE
4989 && (!TYPE_DOMAIN (TREE_TYPE (local->field))
4990 || !TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local->field)))))
4992 fieldsize = array_size_for_constructor (local->val);
4993 /* Given a non-empty initialization, this field had better
4994 be last. Given a flexible array member, the next field
4995 on the chain is a TYPE_DECL of the enclosing struct. */
4996 const_tree next = DECL_CHAIN (local->field);
4997 gcc_assert (!fieldsize || !next || TREE_CODE (next) != FIELD_DECL);
5000 fieldsize = tree_to_uhwi (DECL_SIZE_UNIT (local->field));
5003 fieldsize = int_size_in_bytes (TREE_TYPE (local->type));
5005 /* Output the element's initial value. */
5006 if (local->val == NULL_TREE)
5007 assemble_zeros (fieldsize);
5010 = output_constant (local->val, fieldsize, align2, local->reverse);
5012 /* Count its size. */
5013 local->total_bytes += fieldsize;
5016 /* Helper for output_constructor. From the LOCAL state, output an element
5017 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5018 from the start of a possibly ongoing outer byte buffer. */
5021 output_constructor_bitfield (oc_local_state *local, unsigned int bit_offset)
5023 /* Bit size of this element. */
5024 HOST_WIDE_INT ebitsize
5026 ? tree_to_uhwi (DECL_SIZE (local->field))
5027 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local->type))));
5029 /* Relative index of this element if this is an array component. */
5030 HOST_WIDE_INT relative_index
5033 ? (tree_to_shwi (local->index)
5034 - tree_to_shwi (local->min_index))
5035 : local->last_relative_index + 1)
5038 /* Bit position of this element from the start of the containing
5040 HOST_WIDE_INT constructor_relative_ebitpos
5042 ? int_bit_position (local->field)
5043 : ebitsize * relative_index);
5045 /* Bit position of this element from the start of a possibly ongoing
5046 outer byte buffer. */
5047 HOST_WIDE_INT byte_relative_ebitpos
5048 = bit_offset + constructor_relative_ebitpos;
5050 /* From the start of a possibly ongoing outer byte buffer, offsets to
5051 the first bit of this element and to the first bit past the end of
5053 HOST_WIDE_INT next_offset = byte_relative_ebitpos;
5054 HOST_WIDE_INT end_offset = byte_relative_ebitpos + ebitsize;
5056 local->last_relative_index = relative_index;
5058 if (local->val == NULL_TREE)
5059 local->val = integer_zero_node;
5061 while (TREE_CODE (local->val) == VIEW_CONVERT_EXPR
5062 || TREE_CODE (local->val) == NON_LVALUE_EXPR)
5063 local->val = TREE_OPERAND (local->val, 0);
5065 if (TREE_CODE (local->val) != INTEGER_CST
5066 && TREE_CODE (local->val) != CONSTRUCTOR)
5068 error ("invalid initial value for member %qE", DECL_NAME (local->field));
5072 /* If this field does not start in this (or next) byte, skip some bytes. */
5073 if (next_offset / BITS_PER_UNIT != local->total_bytes)
5075 /* Output remnant of any bit field in previous bytes. */
5076 if (local->byte_buffer_in_use)
5078 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
5079 local->total_bytes++;
5080 local->byte_buffer_in_use = false;
5083 /* If still not at proper byte, advance to there. */
5084 if (next_offset / BITS_PER_UNIT != local->total_bytes)
5086 gcc_assert (next_offset / BITS_PER_UNIT >= local->total_bytes);
5087 assemble_zeros (next_offset / BITS_PER_UNIT - local->total_bytes);
5088 local->total_bytes = next_offset / BITS_PER_UNIT;
5092 /* Set up the buffer if necessary. */
5093 if (!local->byte_buffer_in_use)
5097 local->byte_buffer_in_use = true;
5100 /* If this is nested constructor, recurse passing the bit offset and the
5101 pending data, then retrieve the new pending data afterwards. */
5102 if (TREE_CODE (local->val) == CONSTRUCTOR)
5104 oc_outer_state temp_state;
5105 temp_state.bit_offset = next_offset % BITS_PER_UNIT;
5106 temp_state.byte = local->byte;
5108 += output_constructor (local->val, 0, 0, local->reverse, &temp_state);
5109 local->byte = temp_state.byte;
5113 /* Otherwise, we must split the element into pieces that fall within
5114 separate bytes, and combine each byte with previous or following
5116 while (next_offset < end_offset)
5120 HOST_WIDE_INT value;
5121 HOST_WIDE_INT next_byte = next_offset / BITS_PER_UNIT;
5122 HOST_WIDE_INT next_bit = next_offset % BITS_PER_UNIT;
5124 /* Advance from byte to byte within this element when necessary. */
5125 while (next_byte != local->total_bytes)
5127 assemble_integer (GEN_INT (local->byte), 1, BITS_PER_UNIT, 1);
5128 local->total_bytes++;
5132 /* Number of bits we can process at once (all part of the same byte). */
5133 this_time = MIN (end_offset - next_offset, BITS_PER_UNIT - next_bit);
5134 if (local->reverse ? !BYTES_BIG_ENDIAN : BYTES_BIG_ENDIAN)
5136 /* For big-endian data, take the most significant bits (of the
5137 bits that are significant) first and put them into bytes from
5138 the most significant end. */
5139 shift = end_offset - next_offset - this_time;
5141 /* Don't try to take a bunch of bits that cross
5142 the word boundary in the INTEGER_CST. We can
5143 only select bits from one element. */
5144 if ((shift / HOST_BITS_PER_WIDE_INT)
5145 != ((shift + this_time - 1) / HOST_BITS_PER_WIDE_INT))
5147 const int end = shift + this_time - 1;
5148 shift = end & -HOST_BITS_PER_WIDE_INT;
5149 this_time = end - shift + 1;
5152 /* Now get the bits from the appropriate constant word. */
5153 value = TREE_INT_CST_ELT (local->val, shift / HOST_BITS_PER_WIDE_INT);
5154 shift = shift & (HOST_BITS_PER_WIDE_INT - 1);
5156 /* Get the result. This works only when:
5157 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5158 local->byte |= (((value >> shift)
5159 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
5160 << (BITS_PER_UNIT - this_time - next_bit));
5164 /* On little-endian machines, take the least significant bits of
5165 the value first and pack them starting at the least significant
5166 bits of the bytes. */
5167 shift = next_offset - byte_relative_ebitpos;
5169 /* Don't try to take a bunch of bits that cross
5170 the word boundary in the INTEGER_CST. We can
5171 only select bits from one element. */
5172 if ((shift / HOST_BITS_PER_WIDE_INT)
5173 != ((shift + this_time - 1) / HOST_BITS_PER_WIDE_INT))
5175 = HOST_BITS_PER_WIDE_INT - (shift & (HOST_BITS_PER_WIDE_INT - 1));
5177 /* Now get the bits from the appropriate constant word. */
5178 value = TREE_INT_CST_ELT (local->val, shift / HOST_BITS_PER_WIDE_INT);
5179 shift = shift & (HOST_BITS_PER_WIDE_INT - 1);
5181 /* Get the result. This works only when:
5182 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5183 local->byte |= (((value >> shift)
5184 & (((HOST_WIDE_INT) 2 << (this_time - 1)) - 1))
5188 next_offset += this_time;
5189 local->byte_buffer_in_use = true;
5193 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5194 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5195 caller output state of relevance in recursive invocations. */
5197 static unsigned HOST_WIDE_INT
5198 output_constructor (tree exp, unsigned HOST_WIDE_INT size, unsigned int align,
5199 bool reverse, oc_outer_state *outer)
5201 unsigned HOST_WIDE_INT cnt;
5202 constructor_elt *ce;
5203 oc_local_state local;
5205 /* Setup our local state to communicate with helpers. */
5207 local.type = TREE_TYPE (exp);
5209 local.align = align;
5210 if (TREE_CODE (local.type) == ARRAY_TYPE && TYPE_DOMAIN (local.type))
5211 local.min_index = TYPE_MIN_VALUE (TYPE_DOMAIN (local.type));
5213 local.min_index = integer_zero_node;
5215 local.total_bytes = 0;
5216 local.byte_buffer_in_use = outer != NULL;
5217 local.byte = outer ? outer->byte : 0;
5218 local.last_relative_index = -1;
5219 /* The storage order is specified for every aggregate type. */
5220 if (AGGREGATE_TYPE_P (local.type))
5221 local.reverse = TYPE_REVERSE_STORAGE_ORDER (local.type);
5223 local.reverse = reverse;
5225 gcc_assert (HOST_BITS_PER_WIDE_INT >= BITS_PER_UNIT);
5227 /* As CE goes through the elements of the constant, FIELD goes through the
5228 structure fields if the constant is a structure. If the constant is a
5229 union, we override this by getting the field from the TREE_LIST element.
5230 But the constant could also be an array. Then FIELD is zero.
5232 There is always a maximum of one element in the chain LINK for unions
5233 (even if the initializer in a source program incorrectly contains
5236 if (TREE_CODE (local.type) == RECORD_TYPE)
5237 local.field = TYPE_FIELDS (local.type);
5239 local.field = NULL_TREE;
5242 vec_safe_iterate (CONSTRUCTOR_ELTS (exp), cnt, &ce);
5243 cnt++, local.field = local.field ? DECL_CHAIN (local.field) : 0)
5245 local.val = ce->value;
5246 local.index = NULL_TREE;
5248 /* The element in a union constructor specifies the proper field
5250 if (RECORD_OR_UNION_TYPE_P (local.type) && ce->index != NULL_TREE)
5251 local.field = ce->index;
5253 else if (TREE_CODE (local.type) == ARRAY_TYPE)
5254 local.index = ce->index;
5256 if (local.field && flag_verbose_asm)
5257 fprintf (asm_out_file, "%s %s:\n",
5259 DECL_NAME (local.field)
5260 ? IDENTIFIER_POINTER (DECL_NAME (local.field))
5263 /* Eliminate the marker that makes a cast not be an lvalue. */
5264 if (local.val != NULL_TREE)
5265 STRIP_NOPS (local.val);
5267 /* Output the current element, using the appropriate helper ... */
5269 /* For an array slice not part of an outer bitfield. */
5271 && local.index != NULL_TREE
5272 && TREE_CODE (local.index) == RANGE_EXPR)
5273 output_constructor_array_range (&local);
5275 /* For a field that is neither a true bitfield nor part of an outer one,
5276 known to be at least byte aligned and multiple-of-bytes long. */
5278 && (local.field == NULL_TREE
5279 || !CONSTRUCTOR_BITFIELD_P (local.field)))
5280 output_constructor_regular_field (&local);
5282 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5283 supported for scalar fields, so we may need to convert first. */
5286 if (TREE_CODE (local.val) == REAL_CST)
5288 = fold_unary (VIEW_CONVERT_EXPR,
5289 build_nonstandard_integer_type
5290 (TYPE_PRECISION (TREE_TYPE (local.val)), 0),
5292 output_constructor_bitfield (&local, outer ? outer->bit_offset : 0);
5296 /* If we are not at toplevel, save the pending data for our caller.
5297 Otherwise output the pending data and padding zeros as needed. */
5299 outer->byte = local.byte;
5302 if (local.byte_buffer_in_use)
5304 assemble_integer (GEN_INT (local.byte), 1, BITS_PER_UNIT, 1);
5305 local.total_bytes++;
5308 if ((unsigned HOST_WIDE_INT)local.total_bytes < local.size)
5310 assemble_zeros (local.size - local.total_bytes);
5311 local.total_bytes = local.size;
5315 return local.total_bytes;
5318 /* Mark DECL as weak. */
5321 mark_weak (tree decl)
5323 if (DECL_WEAK (decl))
5326 struct symtab_node *n = symtab_node::get (decl);
5327 if (n && n->refuse_visibility_changes)
5328 error ("%+D declared weak after being used", decl);
5329 DECL_WEAK (decl) = 1;
5331 if (DECL_RTL_SET_P (decl)
5332 && MEM_P (DECL_RTL (decl))
5333 && XEXP (DECL_RTL (decl), 0)
5334 && GET_CODE (XEXP (DECL_RTL (decl), 0)) == SYMBOL_REF)
5335 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl), 0)) = 1;
5338 /* Merge weak status between NEWDECL and OLDDECL. */
5341 merge_weak (tree newdecl, tree olddecl)
5343 if (DECL_WEAK (newdecl) == DECL_WEAK (olddecl))
5345 if (DECL_WEAK (newdecl) && TARGET_SUPPORTS_WEAK)
5348 /* We put the NEWDECL on the weak_decls list at some point
5349 and OLDDECL as well. Keep just OLDDECL on the list. */
5350 for (pwd = &weak_decls; *pwd; pwd = &TREE_CHAIN (*pwd))
5351 if (TREE_VALUE (*pwd) == newdecl)
5353 *pwd = TREE_CHAIN (*pwd);
5360 if (DECL_WEAK (newdecl))
5364 /* NEWDECL is weak, but OLDDECL is not. */
5366 /* If we already output the OLDDECL, we're in trouble; we can't
5367 go back and make it weak. This should never happen in
5368 unit-at-a-time compilation. */
5369 gcc_assert (!TREE_ASM_WRITTEN (olddecl));
5371 /* If we've already generated rtl referencing OLDDECL, we may
5372 have done so in a way that will not function properly with
5373 a weak symbol. Again in unit-at-a-time this should be
5375 gcc_assert (!TREE_USED (olddecl)
5376 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl)));
5378 if (TARGET_SUPPORTS_WEAK)
5380 /* We put the NEWDECL on the weak_decls list at some point.
5381 Replace it with the OLDDECL. */
5382 for (wd = weak_decls; wd; wd = TREE_CHAIN (wd))
5383 if (TREE_VALUE (wd) == newdecl)
5385 TREE_VALUE (wd) = olddecl;
5388 /* We may not find the entry on the list. If NEWDECL is a
5389 weak alias, then we will have already called
5390 globalize_decl to remove the entry; in that case, we do
5391 not need to do anything. */
5394 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5395 mark_weak (olddecl);
5398 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5399 weak. Just update NEWDECL to indicate that it's weak too. */
5400 mark_weak (newdecl);
5403 /* Declare DECL to be a weak symbol. */
5406 declare_weak (tree decl)
5408 gcc_assert (TREE_CODE (decl) != FUNCTION_DECL || !TREE_ASM_WRITTEN (decl));
5409 if (! TREE_PUBLIC (decl))
5411 error ("weak declaration of %q+D must be public", decl);
5414 else if (!TARGET_SUPPORTS_WEAK)
5415 warning (0, "weak declaration of %q+D not supported", decl);
5418 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl)))
5419 DECL_ATTRIBUTES (decl)
5420 = tree_cons (get_identifier ("weak"), NULL, DECL_ATTRIBUTES (decl));
5424 weak_finish_1 (tree decl)
5426 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5427 const char *const name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
5430 if (! TREE_USED (decl))
5433 #ifdef ASM_WEAKEN_DECL
5434 ASM_WEAKEN_DECL (asm_out_file, decl, name, NULL);
5436 #ifdef ASM_WEAKEN_LABEL
5437 ASM_WEAKEN_LABEL (asm_out_file, name);
5439 #ifdef ASM_OUTPUT_WEAK_ALIAS
5441 static bool warn_once = 0;
5444 warning (0, "only weak aliases are supported in this configuration");
5454 /* Fiven an assembly name, find the decl it is associated with. */
5456 find_decl (tree target)
5458 symtab_node *node = symtab_node::get_for_asmname (target);
5464 /* This TREE_LIST contains weakref targets. */
5466 static GTY(()) tree weakref_targets;
5468 /* Emit any pending weak declarations. */
5475 for (t = weakref_targets; t; t = TREE_CHAIN (t))
5477 tree alias_decl = TREE_PURPOSE (t);
5478 tree target = ultimate_transparent_alias_target (&TREE_VALUE (t));
5480 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl)))
5481 /* Remove alias_decl from the weak list, but leave entries for
5482 the target alone. */
5484 #ifndef ASM_OUTPUT_WEAKREF
5485 else if (! TREE_SYMBOL_REFERENCED (target))
5487 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5488 defined, otherwise we and weak_finish_1 would use
5489 different macros. */
5490 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5491 ASM_WEAKEN_LABEL (asm_out_file, IDENTIFIER_POINTER (target));
5493 tree decl = find_decl (target);
5497 decl = build_decl (DECL_SOURCE_LOCATION (alias_decl),
5498 TREE_CODE (alias_decl), target,
5499 TREE_TYPE (alias_decl));
5501 DECL_EXTERNAL (decl) = 1;
5502 TREE_PUBLIC (decl) = 1;
5503 DECL_ARTIFICIAL (decl) = 1;
5504 TREE_NOTHROW (decl) = TREE_NOTHROW (alias_decl);
5505 TREE_USED (decl) = 1;
5508 weak_finish_1 (decl);
5517 /* Remove the alias and the target from the pending weak list
5518 so that we do not emit any .weak directives for the former,
5519 nor multiple .weak directives for the latter. */
5520 for (p = &weak_decls; (t2 = *p) ; )
5522 if (TREE_VALUE (t2) == alias_decl
5523 || target == DECL_ASSEMBLER_NAME (TREE_VALUE (t2)))
5524 *p = TREE_CHAIN (t2);
5526 p = &TREE_CHAIN (t2);
5529 /* Remove other weakrefs to the same target, to speed things up. */
5530 for (p = &TREE_CHAIN (t); (t2 = *p) ; )
5532 if (target == ultimate_transparent_alias_target (&TREE_VALUE (t2)))
5533 *p = TREE_CHAIN (t2);
5535 p = &TREE_CHAIN (t2);
5540 for (t = weak_decls; t; t = TREE_CHAIN (t))
5542 tree decl = TREE_VALUE (t);
5544 weak_finish_1 (decl);
5548 /* Emit the assembly bits to indicate that DECL is globally visible. */
5551 globalize_decl (tree decl)
5554 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5555 if (DECL_WEAK (decl))
5557 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
5560 #ifdef ASM_WEAKEN_DECL
5561 ASM_WEAKEN_DECL (asm_out_file, decl, name, 0);
5563 ASM_WEAKEN_LABEL (asm_out_file, name);
5566 /* Remove this function from the pending weak list so that
5567 we do not emit multiple .weak directives for it. */
5568 for (p = &weak_decls; (t = *p) ; )
5570 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5571 *p = TREE_CHAIN (t);
5573 p = &TREE_CHAIN (t);
5576 /* Remove weakrefs to the same target from the pending weakref
5577 list, for the same reason. */
5578 for (p = &weakref_targets; (t = *p) ; )
5580 if (DECL_ASSEMBLER_NAME (decl)
5581 == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5582 *p = TREE_CHAIN (t);
5584 p = &TREE_CHAIN (t);
5591 targetm.asm_out.globalize_decl_name (asm_out_file, decl);
5594 vec<alias_pair, va_gc> *alias_pairs;
5596 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5597 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5598 tree node is DECL to have the value of the tree node TARGET. */
5601 do_assemble_alias (tree decl, tree target)
5605 /* Emulated TLS had better not get this var. */
5606 gcc_assert (!(!targetm.have_tls
5607 && TREE_CODE (decl) == VAR_DECL
5608 && DECL_THREAD_LOCAL_P (decl)));
5610 if (TREE_ASM_WRITTEN (decl))
5613 id = DECL_ASSEMBLER_NAME (decl);
5614 ultimate_transparent_alias_target (&id);
5615 ultimate_transparent_alias_target (&target);
5617 /* We must force creation of DECL_RTL for debug info generation, even though
5618 we don't use it here. */
5619 make_decl_rtl (decl);
5621 TREE_ASM_WRITTEN (decl) = 1;
5622 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl)) = 1;
5623 TREE_ASM_WRITTEN (id) = 1;
5625 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5627 if (!TREE_SYMBOL_REFERENCED (target))
5628 weakref_targets = tree_cons (decl, target, weakref_targets);
5630 #ifdef ASM_OUTPUT_WEAKREF
5631 ASM_OUTPUT_WEAKREF (asm_out_file, decl,
5632 IDENTIFIER_POINTER (id),
5633 IDENTIFIER_POINTER (target));
5635 if (!TARGET_SUPPORTS_WEAK)
5637 error_at (DECL_SOURCE_LOCATION (decl),
5638 "weakref is not supported in this configuration");
5645 #ifdef ASM_OUTPUT_DEF
5646 tree orig_decl = decl;
5648 if (TREE_CODE (decl) == FUNCTION_DECL
5649 && cgraph_node::get (decl)->instrumentation_clone
5650 && cgraph_node::get (decl)->instrumented_version)
5651 orig_decl = cgraph_node::get (decl)->instrumented_version->decl;
5653 /* Make name accessible from other files, if appropriate. */
5655 if (TREE_PUBLIC (decl) || TREE_PUBLIC (orig_decl))
5657 globalize_decl (decl);
5658 maybe_assemble_visibility (decl);
5660 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl)))
5662 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5663 if (targetm.has_ifunc_p ())
5664 ASM_OUTPUT_TYPE_DIRECTIVE
5665 (asm_out_file, IDENTIFIER_POINTER (id),
5669 error_at (DECL_SOURCE_LOCATION (decl),
5670 "ifunc is not supported on this target");
5673 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5674 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file, decl, target);
5676 ASM_OUTPUT_DEF (asm_out_file,
5677 IDENTIFIER_POINTER (id),
5678 IDENTIFIER_POINTER (target));
5680 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5685 name = IDENTIFIER_POINTER (id);
5686 # ifdef ASM_WEAKEN_DECL
5687 ASM_WEAKEN_DECL (asm_out_file, decl, name, IDENTIFIER_POINTER (target));
5689 ASM_OUTPUT_WEAK_ALIAS (asm_out_file, name, IDENTIFIER_POINTER (target));
5691 /* Remove this function from the pending weak list so that
5692 we do not emit multiple .weak directives for it. */
5693 for (p = &weak_decls; (t = *p) ; )
5694 if (DECL_ASSEMBLER_NAME (decl) == DECL_ASSEMBLER_NAME (TREE_VALUE (t))
5695 || id == DECL_ASSEMBLER_NAME (TREE_VALUE (t)))
5696 *p = TREE_CHAIN (t);
5698 p = &TREE_CHAIN (t);
5700 /* Remove weakrefs to the same target from the pending weakref
5701 list, for the same reason. */
5702 for (p = &weakref_targets; (t = *p) ; )
5704 if (id == ultimate_transparent_alias_target (&TREE_VALUE (t)))
5705 *p = TREE_CHAIN (t);
5707 p = &TREE_CHAIN (t);
5713 /* Emit an assembler directive to make the symbol for DECL an alias to
5714 the symbol for TARGET. */
5717 assemble_alias (tree decl, tree target)
5721 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl)))
5723 tree alias = DECL_ASSEMBLER_NAME (decl);
5725 ultimate_transparent_alias_target (&target);
5727 if (alias == target)
5728 error ("weakref %q+D ultimately targets itself", decl);
5729 if (TREE_PUBLIC (decl))
5730 error ("weakref %q+D must have static linkage", decl);
5734 #if !defined (ASM_OUTPUT_DEF)
5735 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5736 error_at (DECL_SOURCE_LOCATION (decl),
5737 "alias definitions not supported in this configuration");
5738 TREE_ASM_WRITTEN (decl) = 1;
5741 if (!DECL_WEAK (decl))
5743 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl)))
5744 error_at (DECL_SOURCE_LOCATION (decl),
5745 "ifunc is not supported in this configuration");
5747 error_at (DECL_SOURCE_LOCATION (decl),
5748 "only weak aliases are supported in this configuration");
5749 TREE_ASM_WRITTEN (decl) = 1;
5755 TREE_USED (decl) = 1;
5757 /* Allow aliases to aliases. */
5758 if (TREE_CODE (decl) == FUNCTION_DECL)
5759 cgraph_node::get_create (decl)->alias = true;
5761 varpool_node::get_create (decl)->alias = true;
5763 /* If the target has already been emitted, we don't have to queue the
5764 alias. This saves a tad of memory. */
5765 if (symtab->global_info_ready)
5766 target_decl = find_decl (target);
5769 if ((target_decl && TREE_ASM_WRITTEN (target_decl))
5770 || symtab->state >= EXPANSION)
5771 do_assemble_alias (decl, target);
5774 alias_pair p = {decl, target};
5775 vec_safe_push (alias_pairs, p);
5779 /* Record and output a table of translations from original function
5780 to its transaction aware clone. Note that tm_pure functions are
5781 considered to be their own clone. */
5783 struct tm_clone_hasher : ggc_cache_ptr_hash<tree_map>
5785 static hashval_t hash (tree_map *m) { return tree_map_hash (m); }
5786 static bool equal (tree_map *a, tree_map *b) { return tree_map_eq (a, b); }
5789 keep_cache_entry (tree_map *&e)
5791 return ggc_marked_p (e->base.from);
5795 static GTY((cache)) hash_table<tm_clone_hasher> *tm_clone_hash;
5798 record_tm_clone_pair (tree o, tree n)
5800 struct tree_map **slot, *h;
5802 if (tm_clone_hash == NULL)
5803 tm_clone_hash = hash_table<tm_clone_hasher>::create_ggc (32);
5805 h = ggc_alloc<tree_map> ();
5806 h->hash = htab_hash_pointer (o);
5810 slot = tm_clone_hash->find_slot_with_hash (h, h->hash, INSERT);
5815 get_tm_clone_pair (tree o)
5819 struct tree_map *h, in;
5822 in.hash = htab_hash_pointer (o);
5823 h = tm_clone_hash->find_with_hash (&in, in.hash);
5830 struct tm_alias_pair
5838 /* Dump the actual pairs to the .tm_clone_table section. */
5841 dump_tm_clone_pairs (vec<tm_alias_pair> tm_alias_pairs)
5845 bool switched = false;
5847 FOR_EACH_VEC_ELT (tm_alias_pairs, i, p)
5851 struct cgraph_node *src_n = cgraph_node::get (src);
5852 struct cgraph_node *dst_n = cgraph_node::get (dst);
5854 /* The function ipa_tm_create_version() marks the clone as needed if
5855 the original function was needed. But we also mark the clone as
5856 needed if we ever called the clone indirectly through
5857 TM_GETTMCLONE. If neither of these are true, we didn't generate
5858 a clone, and we didn't call it indirectly... no sense keeping it
5859 in the clone table. */
5860 if (!dst_n || !dst_n->definition)
5863 /* This covers the case where we have optimized the original
5864 function away, and only access the transactional clone. */
5865 if (!src_n || !src_n->definition)
5870 switch_to_section (targetm.asm_out.tm_clone_table_section ());
5871 assemble_align (POINTER_SIZE);
5875 assemble_integer (XEXP (DECL_RTL (src), 0),
5876 POINTER_SIZE_UNITS, POINTER_SIZE, 1);
5877 assemble_integer (XEXP (DECL_RTL (dst), 0),
5878 POINTER_SIZE_UNITS, POINTER_SIZE, 1);
5882 /* Provide a default for the tm_clone_table section. */
5885 default_clone_table_section (void)
5887 return get_named_section (NULL, ".tm_clone_table", 3);
5890 /* Helper comparison function for qsorting by the DECL_UID stored in
5891 alias_pair->emitted_diags. */
5894 tm_alias_pair_cmp (const void *x, const void *y)
5896 const tm_alias_pair *p1 = (const tm_alias_pair *) x;
5897 const tm_alias_pair *p2 = (const tm_alias_pair *) y;
5898 if (p1->uid < p2->uid)
5900 if (p1->uid > p2->uid)
5906 finish_tm_clone_pairs (void)
5908 vec<tm_alias_pair> tm_alias_pairs = vNULL;
5910 if (tm_clone_hash == NULL)
5913 /* We need a determenistic order for the .tm_clone_table, otherwise
5914 we will get bootstrap comparison failures, so dump the hash table
5915 to a vector, sort it, and dump the vector. */
5917 /* Dump the hashtable to a vector. */
5919 hash_table<tm_clone_hasher>::iterator iter;
5920 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash, map, tree_map *, iter)
5922 tm_alias_pair p = {DECL_UID (map->base.from), map->base.from, map->to};
5923 tm_alias_pairs.safe_push (p);
5926 tm_alias_pairs.qsort (tm_alias_pair_cmp);
5929 dump_tm_clone_pairs (tm_alias_pairs);
5931 tm_clone_hash->empty ();
5932 tm_clone_hash = NULL;
5933 tm_alias_pairs.release ();
5937 /* Emit an assembler directive to set symbol for DECL visibility to
5938 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5941 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED,
5942 int vis ATTRIBUTE_UNUSED)
5944 #ifdef HAVE_GAS_HIDDEN
5945 static const char * const visibility_types[] = {
5946 NULL, "protected", "hidden", "internal"
5949 const char *name, *type;
5952 id = DECL_ASSEMBLER_NAME (decl);
5953 ultimate_transparent_alias_target (&id);
5954 name = IDENTIFIER_POINTER (id);
5956 type = visibility_types[vis];
5958 fprintf (asm_out_file, "\t.%s\t", type);
5959 assemble_name (asm_out_file, name);
5960 fprintf (asm_out_file, "\n");
5962 if (!DECL_ARTIFICIAL (decl))
5963 warning (OPT_Wattributes, "visibility attribute not supported "
5964 "in this configuration; ignored");
5968 /* A helper function to call assemble_visibility when needed for a decl. */
5971 maybe_assemble_visibility (tree decl)
5973 enum symbol_visibility vis = DECL_VISIBILITY (decl);
5975 if (TREE_CODE (decl) == FUNCTION_DECL
5976 && cgraph_node::get (decl)
5977 && cgraph_node::get (decl)->instrumentation_clone
5978 && cgraph_node::get (decl)->instrumented_version)
5979 vis = DECL_VISIBILITY (cgraph_node::get (decl)->instrumented_version->decl);
5981 if (vis != VISIBILITY_DEFAULT)
5983 targetm.asm_out.assemble_visibility (decl, vis);
5990 /* Returns 1 if the target configuration supports defining public symbols
5991 so that one of them will be chosen at link time instead of generating a
5992 multiply-defined symbol error, whether through the use of weak symbols or
5993 a target-specific mechanism for having duplicates discarded. */
5996 supports_one_only (void)
5998 if (SUPPORTS_ONE_ONLY)
6000 return TARGET_SUPPORTS_WEAK;
6003 /* Set up DECL as a public symbol that can be defined in multiple
6004 translation units without generating a linker error. */
6007 make_decl_one_only (tree decl, tree comdat_group)
6009 struct symtab_node *symbol;
6010 gcc_assert (TREE_CODE (decl) == VAR_DECL
6011 || TREE_CODE (decl) == FUNCTION_DECL);
6013 TREE_PUBLIC (decl) = 1;
6015 if (TREE_CODE (decl) == VAR_DECL)
6016 symbol = varpool_node::get_create (decl);
6018 symbol = cgraph_node::get_create (decl);
6020 if (SUPPORTS_ONE_ONLY)
6022 #ifdef MAKE_DECL_ONE_ONLY
6023 MAKE_DECL_ONE_ONLY (decl);
6025 symbol->set_comdat_group (comdat_group);
6027 else if (TREE_CODE (decl) == VAR_DECL
6028 && (DECL_INITIAL (decl) == 0
6029 || (!in_lto_p && DECL_INITIAL (decl) == error_mark_node)))
6030 DECL_COMMON (decl) = 1;
6033 gcc_assert (TARGET_SUPPORTS_WEAK);
6034 DECL_WEAK (decl) = 1;
6039 init_varasm_once (void)
6041 section_htab = hash_table<section_hasher>::create_ggc (31);
6042 object_block_htab = hash_table<object_block_hasher>::create_ggc (31);
6043 const_desc_htab = hash_table<tree_descriptor_hasher>::create_ggc (1009);
6045 shared_constant_pool = create_constant_pool ();
6047 #ifdef TEXT_SECTION_ASM_OP
6048 text_section = get_unnamed_section (SECTION_CODE, output_section_asm_op,
6049 TEXT_SECTION_ASM_OP);
6052 #ifdef DATA_SECTION_ASM_OP
6053 data_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
6054 DATA_SECTION_ASM_OP);
6057 #ifdef SDATA_SECTION_ASM_OP
6058 sdata_section = get_unnamed_section (SECTION_WRITE, output_section_asm_op,
6059 SDATA_SECTION_ASM_OP);
6062 #ifdef READONLY_DATA_SECTION_ASM_OP
6063 readonly_data_section = get_unnamed_section (0, output_section_asm_op,
6064 READONLY_DATA_SECTION_ASM_OP);
6067 #ifdef CTORS_SECTION_ASM_OP
6068 ctors_section = get_unnamed_section (0, output_section_asm_op,
6069 CTORS_SECTION_ASM_OP);
6072 #ifdef DTORS_SECTION_ASM_OP
6073 dtors_section = get_unnamed_section (0, output_section_asm_op,
6074 DTORS_SECTION_ASM_OP);
6077 #ifdef BSS_SECTION_ASM_OP
6078 bss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
6079 output_section_asm_op,
6080 BSS_SECTION_ASM_OP);
6083 #ifdef SBSS_SECTION_ASM_OP
6084 sbss_section = get_unnamed_section (SECTION_WRITE | SECTION_BSS,
6085 output_section_asm_op,
6086 SBSS_SECTION_ASM_OP);
6089 tls_comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6090 | SECTION_COMMON, emit_tls_common);
6091 lcomm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6092 | SECTION_COMMON, emit_local);
6093 comm_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS
6094 | SECTION_COMMON, emit_common);
6096 #if defined ASM_OUTPUT_ALIGNED_BSS
6097 bss_noswitch_section = get_noswitch_section (SECTION_WRITE | SECTION_BSS,
6101 targetm.asm_out.init_sections ();
6103 if (readonly_data_section == NULL)
6104 readonly_data_section = text_section;
6106 #ifdef ASM_OUTPUT_EXTERNAL
6107 pending_assemble_externals_set = new hash_set<tree>;
6112 decl_default_tls_model (const_tree decl)
6114 enum tls_model kind;
6117 is_local = targetm.binds_local_p (decl);
6121 kind = TLS_MODEL_LOCAL_EXEC;
6123 kind = TLS_MODEL_INITIAL_EXEC;
6126 /* Local dynamic is inefficient when we're not combining the
6127 parts of the address. */
6128 else if (optimize && is_local)
6129 kind = TLS_MODEL_LOCAL_DYNAMIC;
6131 kind = TLS_MODEL_GLOBAL_DYNAMIC;
6132 if (kind < flag_tls_default)
6133 kind = flag_tls_default;
6138 /* Select a set of attributes for section NAME based on the properties
6139 of DECL and whether or not RELOC indicates that DECL's initializer
6140 might contain runtime relocations.
6142 We make the section read-only and executable for a function decl,
6143 read-only for a const data decl, and writable for a non-const data decl. */
6146 default_section_type_flags (tree decl, const char *name, int reloc)
6150 if (decl && TREE_CODE (decl) == FUNCTION_DECL)
6151 flags = SECTION_CODE;
6154 enum section_category category
6155 = categorize_decl_for_section (decl, reloc);
6156 if (decl_readonly_section_1 (category))
6158 else if (category == SECCAT_DATA_REL_RO
6159 || category == SECCAT_DATA_REL_RO_LOCAL)
6160 flags = SECTION_WRITE | SECTION_RELRO;
6162 flags = SECTION_WRITE;
6166 flags = SECTION_WRITE;
6167 if (strcmp (name, ".data.rel.ro") == 0
6168 || strcmp (name, ".data.rel.ro.local") == 0)
6169 flags |= SECTION_RELRO;
6172 if (decl && DECL_P (decl) && DECL_COMDAT_GROUP (decl))
6173 flags |= SECTION_LINKONCE;
6175 if (strcmp (name, ".vtable_map_vars") == 0)
6176 flags |= SECTION_LINKONCE;
6178 if (decl && TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
6179 flags |= SECTION_TLS | SECTION_WRITE;
6181 if (strcmp (name, ".bss") == 0
6182 || strncmp (name, ".bss.", 5) == 0
6183 || strncmp (name, ".gnu.linkonce.b.", 16) == 0
6184 || strcmp (name, ".persistent.bss") == 0
6185 || strcmp (name, ".sbss") == 0
6186 || strncmp (name, ".sbss.", 6) == 0
6187 || strncmp (name, ".gnu.linkonce.sb.", 17) == 0)
6188 flags |= SECTION_BSS;
6190 if (strcmp (name, ".tdata") == 0
6191 || strncmp (name, ".tdata.", 7) == 0
6192 || strncmp (name, ".gnu.linkonce.td.", 17) == 0)
6193 flags |= SECTION_TLS;
6195 if (strcmp (name, ".tbss") == 0
6196 || strncmp (name, ".tbss.", 6) == 0
6197 || strncmp (name, ".gnu.linkonce.tb.", 17) == 0)
6198 flags |= SECTION_TLS | SECTION_BSS;
6200 /* These three sections have special ELF types. They are neither
6201 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6202 want to print a section type (@progbits or @nobits). If someone
6203 is silly enough to emit code or TLS variables to one of these
6204 sections, then don't handle them specially. */
6205 if (!(flags & (SECTION_CODE | SECTION_BSS | SECTION_TLS))
6206 && (strcmp (name, ".init_array") == 0
6207 || strcmp (name, ".fini_array") == 0
6208 || strcmp (name, ".preinit_array") == 0))
6209 flags |= SECTION_NOTYPE;
6214 /* Return true if the target supports some form of global BSS,
6215 either through bss_noswitch_section, or by selecting a BSS
6216 section in TARGET_ASM_SELECT_SECTION. */
6219 have_global_bss_p (void)
6221 return bss_noswitch_section || targetm.have_switchable_bss_sections;
6224 /* Output assembly to switch to section NAME with attribute FLAGS.
6225 Four variants for common object file formats. */
6228 default_no_named_section (const char *name ATTRIBUTE_UNUSED,
6229 unsigned int flags ATTRIBUTE_UNUSED,
6230 tree decl ATTRIBUTE_UNUSED)
6232 /* Some object formats don't support named sections at all. The
6233 front-end should already have flagged this as an error. */
6237 #ifndef TLS_SECTION_ASM_FLAG
6238 #define TLS_SECTION_ASM_FLAG 'T'
6242 default_elf_asm_named_section (const char *name, unsigned int flags,
6245 char flagchars[10], *f = flagchars;
6247 /* If we have already declared this section, we can use an
6248 abbreviated form to switch back to it -- unless this section is
6249 part of a COMDAT groups, in which case GAS requires the full
6250 declaration every time. */
6251 if (!(HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6252 && (flags & SECTION_DECLARED))
6254 fprintf (asm_out_file, "\t.section\t%s\n", name);
6258 if (!(flags & SECTION_DEBUG))
6260 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6261 if (flags & SECTION_EXCLUDE)
6264 if (flags & SECTION_WRITE)
6266 if (flags & SECTION_CODE)
6268 if (flags & SECTION_SMALL)
6270 if (flags & SECTION_MERGE)
6272 if (flags & SECTION_STRINGS)
6274 if (flags & SECTION_TLS)
6275 *f++ = TLS_SECTION_ASM_FLAG;
6276 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6280 fprintf (asm_out_file, "\t.section\t%s,\"%s\"", name, flagchars);
6282 if (!(flags & SECTION_NOTYPE))
6287 if (flags & SECTION_BSS)
6293 /* On platforms that use "@" as the assembly comment character,
6295 if (strcmp (ASM_COMMENT_START, "@") == 0)
6297 fprintf (asm_out_file, format, type);
6299 if (flags & SECTION_ENTSIZE)
6300 fprintf (asm_out_file, ",%d", flags & SECTION_ENTSIZE);
6301 if (HAVE_COMDAT_GROUP && (flags & SECTION_LINKONCE))
6303 if (TREE_CODE (decl) == IDENTIFIER_NODE)
6304 fprintf (asm_out_file, ",%s,comdat", IDENTIFIER_POINTER (decl));
6306 fprintf (asm_out_file, ",%s,comdat",
6307 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl)));
6311 putc ('\n', asm_out_file);
6315 default_coff_asm_named_section (const char *name, unsigned int flags,
6316 tree decl ATTRIBUTE_UNUSED)
6318 char flagchars[8], *f = flagchars;
6320 if (flags & SECTION_WRITE)
6322 if (flags & SECTION_CODE)
6326 fprintf (asm_out_file, "\t.section\t%s,\"%s\"\n", name, flagchars);
6330 default_pe_asm_named_section (const char *name, unsigned int flags,
6333 default_coff_asm_named_section (name, flags, decl);
6335 if (flags & SECTION_LINKONCE)
6337 /* Functions may have been compiled at various levels of
6338 optimization so we can't use `same_size' here.
6339 Instead, have the linker pick one. */
6340 fprintf (asm_out_file, "\t.linkonce %s\n",
6341 (flags & SECTION_CODE ? "discard" : "same_size"));
6345 /* The lame default section selector. */
6348 default_select_section (tree decl, int reloc,
6349 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6353 if (decl_readonly_section (decl, reloc))
6354 return readonly_data_section;
6356 else if (TREE_CODE (decl) == CONSTRUCTOR)
6358 if (! ((flag_pic && reloc)
6359 || !TREE_READONLY (decl)
6360 || TREE_SIDE_EFFECTS (decl)
6361 || !TREE_CONSTANT (decl)))
6362 return readonly_data_section;
6364 else if (TREE_CODE (decl) == STRING_CST)
6365 return readonly_data_section;
6366 else if (! (flag_pic && reloc))
6367 return readonly_data_section;
6369 return data_section;
6372 enum section_category
6373 categorize_decl_for_section (const_tree decl, int reloc)
6375 enum section_category ret;
6377 if (TREE_CODE (decl) == FUNCTION_DECL)
6379 else if (TREE_CODE (decl) == STRING_CST)
6381 if ((flag_sanitize & SANITIZE_ADDRESS)
6382 && asan_protect_global (CONST_CAST_TREE (decl)))
6383 /* or !flag_merge_constants */
6384 return SECCAT_RODATA;
6386 return SECCAT_RODATA_MERGE_STR;
6388 else if (TREE_CODE (decl) == VAR_DECL)
6390 tree d = CONST_CAST_TREE (decl);
6391 if (bss_initializer_p (decl))
6393 else if (! TREE_READONLY (decl)
6394 || TREE_SIDE_EFFECTS (decl)
6395 || ! TREE_CONSTANT (DECL_INITIAL (decl)))
6397 /* Here the reloc_rw_mask is not testing whether the section should
6398 be read-only or not, but whether the dynamic link will have to
6399 do something. If so, we wish to segregate the data in order to
6400 minimize cache misses inside the dynamic linker. */
6401 if (reloc & targetm.asm_out.reloc_rw_mask ())
6402 ret = reloc == 1 ? SECCAT_DATA_REL_LOCAL : SECCAT_DATA_REL;
6406 else if (reloc & targetm.asm_out.reloc_rw_mask ())
6407 ret = reloc == 1 ? SECCAT_DATA_REL_RO_LOCAL : SECCAT_DATA_REL_RO;
6408 else if (reloc || flag_merge_constants < 2
6409 || ((flag_sanitize & SANITIZE_ADDRESS)
6410 /* PR 81697: for architectures that use section anchors we
6411 need to ignore DECL_RTL_SET_P (decl) for string constants
6412 inside this asan_protect_global call because otherwise
6413 we'll wrongly put them into SECCAT_RODATA_MERGE_CONST
6414 section, set DECL_RTL (decl) later on and add DECL to
6415 protected globals via successive asan_protect_global
6416 calls. In this scenario we'll end up with wrong
6417 alignment of these strings at runtime and possible ASan
6419 && asan_protect_global (d, use_object_blocks_p ()
6420 && use_blocks_for_decl_p (d))))
6421 /* C and C++ don't allow different variables to share the same
6422 location. -fmerge-all-constants allows even that (at the
6423 expense of not conforming). */
6424 ret = SECCAT_RODATA;
6425 else if (TREE_CODE (DECL_INITIAL (decl)) == STRING_CST)
6426 ret = SECCAT_RODATA_MERGE_STR_INIT;
6428 ret = SECCAT_RODATA_MERGE_CONST;
6430 else if (TREE_CODE (decl) == CONSTRUCTOR)
6432 if ((reloc & targetm.asm_out.reloc_rw_mask ())
6433 || TREE_SIDE_EFFECTS (decl)
6434 || ! TREE_CONSTANT (decl))
6437 ret = SECCAT_RODATA;
6440 ret = SECCAT_RODATA;
6442 /* There are no read-only thread-local sections. */
6443 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
6445 /* Note that this would be *just* SECCAT_BSS, except that there's
6446 no concept of a read-only thread-local-data section. */
6447 if (ret == SECCAT_BSS
6448 || (flag_zero_initialized_in_bss
6449 && initializer_zerop (DECL_INITIAL (decl))))
6455 /* If the target uses small data sections, select it. */
6456 else if (targetm.in_small_data_p (decl))
6458 if (ret == SECCAT_BSS)
6460 else if (targetm.have_srodata_section && ret == SECCAT_RODATA)
6461 ret = SECCAT_SRODATA;
6470 decl_readonly_section_1 (enum section_category category)
6475 case SECCAT_RODATA_MERGE_STR:
6476 case SECCAT_RODATA_MERGE_STR_INIT:
6477 case SECCAT_RODATA_MERGE_CONST:
6478 case SECCAT_SRODATA:
6486 decl_readonly_section (const_tree decl, int reloc)
6488 return decl_readonly_section_1 (categorize_decl_for_section (decl, reloc));
6491 /* Select a section based on the above categorization. */
6494 default_elf_select_section (tree decl, int reloc,
6495 unsigned HOST_WIDE_INT align)
6498 switch (categorize_decl_for_section (decl, reloc))
6501 /* We're not supposed to be called on FUNCTION_DECLs. */
6504 return readonly_data_section;
6505 case SECCAT_RODATA_MERGE_STR:
6506 return mergeable_string_section (decl, align, 0);
6507 case SECCAT_RODATA_MERGE_STR_INIT:
6508 return mergeable_string_section (DECL_INITIAL (decl), align, 0);
6509 case SECCAT_RODATA_MERGE_CONST:
6510 return mergeable_constant_section (DECL_MODE (decl), align, 0);
6511 case SECCAT_SRODATA:
6515 return data_section;
6516 case SECCAT_DATA_REL:
6517 sname = ".data.rel";
6519 case SECCAT_DATA_REL_LOCAL:
6520 sname = ".data.rel.local";
6522 case SECCAT_DATA_REL_RO:
6523 sname = ".data.rel.ro";
6525 case SECCAT_DATA_REL_RO_LOCAL:
6526 sname = ".data.rel.ro.local";
6549 return get_named_section (decl, sname, reloc);
6552 /* Construct a unique section name based on the decl name and the
6553 categorization performed above. */
6556 default_unique_section (tree decl, int reloc)
6558 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6559 bool one_only = DECL_ONE_ONLY (decl) && !HAVE_COMDAT_GROUP;
6560 const char *prefix, *name, *linkonce;
6564 switch (categorize_decl_for_section (decl, reloc))
6567 prefix = one_only ? ".t" : ".text";
6570 case SECCAT_RODATA_MERGE_STR:
6571 case SECCAT_RODATA_MERGE_STR_INIT:
6572 case SECCAT_RODATA_MERGE_CONST:
6573 prefix = one_only ? ".r" : ".rodata";
6575 case SECCAT_SRODATA:
6576 prefix = one_only ? ".s2" : ".sdata2";
6579 prefix = one_only ? ".d" : ".data";
6581 case SECCAT_DATA_REL:
6582 prefix = one_only ? ".d.rel" : ".data.rel";
6584 case SECCAT_DATA_REL_LOCAL:
6585 prefix = one_only ? ".d.rel.local" : ".data.rel.local";
6587 case SECCAT_DATA_REL_RO:
6588 prefix = one_only ? ".d.rel.ro" : ".data.rel.ro";
6590 case SECCAT_DATA_REL_RO_LOCAL:
6591 prefix = one_only ? ".d.rel.ro.local" : ".data.rel.ro.local";
6594 prefix = one_only ? ".s" : ".sdata";
6597 prefix = one_only ? ".b" : ".bss";
6600 prefix = one_only ? ".sb" : ".sbss";
6603 prefix = one_only ? ".td" : ".tdata";
6606 prefix = one_only ? ".tb" : ".tbss";
6612 id = DECL_ASSEMBLER_NAME (decl);
6613 ultimate_transparent_alias_target (&id);
6614 name = IDENTIFIER_POINTER (id);
6615 name = targetm.strip_name_encoding (name);
6617 /* If we're using one_only, then there needs to be a .gnu.linkonce
6618 prefix to the section name. */
6619 linkonce = one_only ? ".gnu.linkonce" : "";
6621 string = ACONCAT ((linkonce, prefix, ".", name, NULL));
6623 set_decl_section_name (decl, string);
6626 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6629 compute_reloc_for_rtx_1 (const_rtx x)
6631 switch (GET_CODE (x))
6634 return SYMBOL_REF_LOCAL_P (x) ? 1 : 2;
6642 /* Like compute_reloc_for_constant, except for an RTX. The return value
6643 is a mask for which bit 1 indicates a global relocation, and bit 0
6644 indicates a local relocation. */
6647 compute_reloc_for_rtx (const_rtx x)
6649 switch (GET_CODE (x))
6653 return compute_reloc_for_rtx_1 (x);
6658 subrtx_iterator::array_type array;
6659 FOR_EACH_SUBRTX (iter, array, x, ALL)
6660 reloc |= compute_reloc_for_rtx_1 (*iter);
6670 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED,
6672 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED)
6674 if (compute_reloc_for_rtx (x) & targetm.asm_out.reloc_rw_mask ())
6675 return data_section;
6677 return readonly_data_section;
6681 default_elf_select_rtx_section (machine_mode mode, rtx x,
6682 unsigned HOST_WIDE_INT align)
6684 int reloc = compute_reloc_for_rtx (x);
6686 /* ??? Handle small data here somehow. */
6688 if (reloc & targetm.asm_out.reloc_rw_mask ())
6691 return get_named_section (NULL, ".data.rel.ro.local", 1);
6693 return get_named_section (NULL, ".data.rel.ro", 3);
6696 return mergeable_constant_section (mode, align, 0);
6699 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6702 default_encode_section_info (tree decl, rtx rtl, int first ATTRIBUTE_UNUSED)
6707 /* Careful not to prod global register variables. */
6710 symbol = XEXP (rtl, 0);
6711 if (GET_CODE (symbol) != SYMBOL_REF)
6714 flags = SYMBOL_REF_FLAGS (symbol) & SYMBOL_FLAG_HAS_BLOCK_INFO;
6715 if (TREE_CODE (decl) == FUNCTION_DECL)
6716 flags |= SYMBOL_FLAG_FUNCTION;
6717 if (targetm.binds_local_p (decl))
6718 flags |= SYMBOL_FLAG_LOCAL;
6719 if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
6720 flags |= DECL_TLS_MODEL (decl) << SYMBOL_FLAG_TLS_SHIFT;
6721 else if (targetm.in_small_data_p (decl))
6722 flags |= SYMBOL_FLAG_SMALL;
6723 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6724 being PUBLIC, the thing *must* be defined in this translation unit.
6725 Prevent this buglet from being propagated into rtl code as well. */
6726 if (DECL_P (decl) && DECL_EXTERNAL (decl) && TREE_PUBLIC (decl))
6727 flags |= SYMBOL_FLAG_EXTERNAL;
6729 SYMBOL_REF_FLAGS (symbol) = flags;
6732 /* By default, we do nothing for encode_section_info, so we need not
6733 do anything but discard the '*' marker. */
6736 default_strip_name_encoding (const char *str)
6738 return str + (*str == '*');
6741 #ifdef ASM_OUTPUT_DEF
6742 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6743 anchor relative to ".", the current section position. */
6746 default_asm_output_anchor (rtx symbol)
6750 sprintf (buffer, "*. + " HOST_WIDE_INT_PRINT_DEC,
6751 SYMBOL_REF_BLOCK_OFFSET (symbol));
6752 ASM_OUTPUT_DEF (asm_out_file, XSTR (symbol, 0), buffer);
6756 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6759 default_use_anchors_for_symbol_p (const_rtx symbol)
6764 /* Don't use anchors for mergeable sections. The linker might move
6765 the objects around. */
6766 sect = SYMBOL_REF_BLOCK (symbol)->sect;
6767 if (sect->common.flags & SECTION_MERGE)
6770 /* Don't use anchors for small data sections. The small data register
6771 acts as an anchor for such sections. */
6772 if (sect->common.flags & SECTION_SMALL)
6775 decl = SYMBOL_REF_DECL (symbol);
6776 if (decl && DECL_P (decl))
6778 /* Don't use section anchors for decls that might be defined or
6779 usurped by other modules. */
6780 if (TREE_PUBLIC (decl) && !decl_binds_to_current_def_p (decl))
6783 /* Don't use section anchors for decls that will be placed in a
6784 small data section. */
6785 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6786 one above. The problem is that we only use SECTION_SMALL for
6787 sections that should be marked as small in the section directive. */
6788 if (targetm.in_small_data_p (decl))
6791 /* Don't use section anchors for decls that won't fit inside a single
6792 anchor range to reduce the amount of instructions required to refer
6793 to the entire declaration. */
6794 if (DECL_SIZE_UNIT (decl) == NULL_TREE
6795 || !tree_fits_uhwi_p (DECL_SIZE_UNIT (decl))
6796 || (tree_to_uhwi (DECL_SIZE_UNIT (decl))
6797 >= (unsigned HOST_WIDE_INT) targetm.max_anchor_offset))
6804 /* Return true when RESOLUTION indicate that symbol will be bound to the
6805 definition provided by current .o file. */
6808 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution)
6810 return (resolution == LDPR_PREVAILING_DEF
6811 || resolution == LDPR_PREVAILING_DEF_IRONLY_EXP
6812 || resolution == LDPR_PREVAILING_DEF_IRONLY);
6815 /* Return true when RESOLUTION indicate that symbol will be bound locally
6816 within current executable or DSO. */
6819 resolution_local_p (enum ld_plugin_symbol_resolution resolution)
6821 return (resolution == LDPR_PREVAILING_DEF
6822 || resolution == LDPR_PREVAILING_DEF_IRONLY
6823 || resolution == LDPR_PREVAILING_DEF_IRONLY_EXP
6824 || resolution == LDPR_PREEMPTED_REG
6825 || resolution == LDPR_PREEMPTED_IR
6826 || resolution == LDPR_RESOLVED_IR
6827 || resolution == LDPR_RESOLVED_EXEC);
6830 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6831 uninitialized common symbol in the executable will still be defined
6832 (through COPY relocation) in the executable. */
6835 default_binds_local_p_3 (const_tree exp, bool shlib, bool weak_dominate,
6836 bool extern_protected_data, bool common_local_p)
6838 /* A non-decl is an entry in the constant pool. */
6842 /* Weakrefs may not bind locally, even though the weakref itself is always
6843 static and therefore local. Similarly, the resolver for ifunc functions
6844 might resolve to a non-local function.
6845 FIXME: We can resolve the weakref case more curefuly by looking at the
6847 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp))
6848 || (TREE_CODE (exp) == FUNCTION_DECL
6849 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp))))
6852 /* Static variables are always local. */
6853 if (! TREE_PUBLIC (exp))
6856 /* With resolution file in hand, take look into resolutions.
6857 We can't just return true for resolved_locally symbols,
6858 because dynamic linking might overwrite symbols
6859 in shared libraries. */
6860 bool resolved_locally = false;
6862 bool uninited_common = (DECL_COMMON (exp)
6863 && (DECL_INITIAL (exp) == NULL
6865 && DECL_INITIAL (exp) == error_mark_node)));
6867 /* A non-external variable is defined locally only if it isn't
6868 uninitialized COMMON variable or common_local_p is true. */
6869 bool defined_locally = (!DECL_EXTERNAL (exp)
6870 && (!uninited_common || common_local_p));
6871 if (symtab_node *node = symtab_node::get (exp))
6873 if (node->in_other_partition)
6874 defined_locally = true;
6875 if (node->can_be_discarded_p ())
6877 else if (resolution_to_local_definition_p (node->resolution))
6878 defined_locally = resolved_locally = true;
6879 else if (resolution_local_p (node->resolution))
6880 resolved_locally = true;
6882 if (defined_locally && weak_dominate && !shlib)
6883 resolved_locally = true;
6885 /* Undefined weak symbols are never defined locally. */
6886 if (DECL_WEAK (exp) && !defined_locally)
6889 /* A symbol is local if the user has said explicitly that it will be,
6890 or if we have a definition for the symbol. We cannot infer visibility
6891 for undefined symbols. */
6892 if (DECL_VISIBILITY (exp) != VISIBILITY_DEFAULT
6893 && (TREE_CODE (exp) == FUNCTION_DECL
6894 || !extern_protected_data
6895 || DECL_VISIBILITY (exp) != VISIBILITY_PROTECTED)
6896 && (DECL_VISIBILITY_SPECIFIED (exp) || defined_locally))
6899 /* If PIC, then assume that any global name can be overridden by
6900 symbols resolved from other modules. */
6904 /* Variables defined outside this object might not be local. */
6905 if (DECL_EXTERNAL (exp) && !resolved_locally)
6908 /* Non-dominant weak symbols are not defined locally. */
6909 if (DECL_WEAK (exp) && !resolved_locally)
6912 /* Uninitialized COMMON variable may be unified with symbols
6913 resolved from other modules. */
6914 if (uninited_common && !resolved_locally)
6917 /* Otherwise we're left with initialized (or non-common) global data
6918 which is of necessity defined locally. */
6922 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6923 wrt cross-module name binding. */
6926 default_binds_local_p (const_tree exp)
6928 return default_binds_local_p_3 (exp, flag_shlib != 0, true, false, false);
6931 /* Similar to default_binds_local_p, but common symbol may be local and
6932 extern protected data is non-local. */
6935 default_binds_local_p_2 (const_tree exp)
6937 return default_binds_local_p_3 (exp, flag_shlib != 0, true, true,
6942 default_binds_local_p_1 (const_tree exp, int shlib)
6944 return default_binds_local_p_3 (exp, shlib != 0, false, false, false);
6947 /* Return true when references to DECL must bind to current definition in
6950 The condition is usually equivalent to whether the function binds to the
6951 current module (shared library or executable), that is to binds_local_p.
6952 We use this fact to avoid need for another target hook and implement
6953 the logic using binds_local_p and just special cases where
6954 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6955 the weak definitions (that can be overwritten at linktime by other
6956 definition from different object file) and when resolution info is available
6957 we simply use the knowledge passed to us by linker plugin. */
6959 decl_binds_to_current_def_p (const_tree decl)
6961 gcc_assert (DECL_P (decl));
6962 if (!targetm.binds_local_p (decl))
6964 if (!TREE_PUBLIC (decl))
6967 /* When resolution is available, just use it. */
6968 if (symtab_node *node = symtab_node::get (decl))
6970 if (node->resolution != LDPR_UNKNOWN
6971 && !node->can_be_discarded_p ())
6972 return resolution_to_local_definition_p (node->resolution);
6975 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6976 binds locally but still can be overwritten), DECL_COMMON (can be merged
6977 with a non-common definition somewhere in the same module) or
6979 This rely on fact that binds_local_p behave as decl_replaceable_p
6980 for all other declaration types. */
6981 if (DECL_WEAK (decl))
6983 if (DECL_COMMON (decl)
6984 && (DECL_INITIAL (decl) == NULL
6985 || (!in_lto_p && DECL_INITIAL (decl) == error_mark_node)))
6987 if (DECL_EXTERNAL (decl))
6992 /* A replaceable function or variable is one which may be replaced
6993 at link-time with an entirely different definition, provided that the
6994 replacement has the same type. For example, functions declared
6995 with __attribute__((weak)) on most systems are replaceable.
6997 COMDAT functions are not replaceable, since all definitions of the
6998 function must be equivalent. It is important that COMDAT functions
6999 not be treated as replaceable so that use of C++ template
7000 instantiations is not penalized. */
7003 decl_replaceable_p (tree decl)
7005 gcc_assert (DECL_P (decl));
7006 if (!TREE_PUBLIC (decl) || DECL_COMDAT (decl))
7008 if (!flag_semantic_interposition
7009 && !DECL_WEAK (decl))
7011 return !decl_binds_to_current_def_p (decl);
7014 /* Default function to output code that will globalize a label. A
7015 target must define GLOBAL_ASM_OP or provide its own function to
7016 globalize a label. */
7017 #ifdef GLOBAL_ASM_OP
7019 default_globalize_label (FILE * stream, const char *name)
7021 fputs (GLOBAL_ASM_OP, stream);
7022 assemble_name (stream, name);
7023 putc ('\n', stream);
7025 #endif /* GLOBAL_ASM_OP */
7027 /* Default function to output code that will globalize a declaration. */
7029 default_globalize_decl_name (FILE * stream, tree decl)
7031 const char *name = XSTR (XEXP (DECL_RTL (decl), 0), 0);
7032 targetm.asm_out.globalize_label (stream, name);
7035 /* Default function to output a label for unwind information. The
7036 default is to do nothing. A target that needs nonlocal labels for
7037 unwind information must provide its own function to do this. */
7039 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED,
7040 tree decl ATTRIBUTE_UNUSED,
7041 int for_eh ATTRIBUTE_UNUSED,
7042 int empty ATTRIBUTE_UNUSED)
7046 /* Default function to output a label to divide up the exception table.
7047 The default is to do nothing. A target that needs/wants to divide
7048 up the table must provide it's own function to do this. */
7050 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED)
7054 /* This is how to output an internal numbered label where PREFIX is
7055 the class of label and LABELNO is the number within the class. */
7058 default_generate_internal_label (char *buf, const char *prefix,
7059 unsigned long labelno)
7061 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
7064 /* This is how to output an internal numbered label where PREFIX is
7065 the class of label and LABELNO is the number within the class. */
7068 default_internal_label (FILE *stream, const char *prefix,
7069 unsigned long labelno)
7071 char *const buf = (char *) alloca (40 + strlen (prefix));
7072 ASM_GENERATE_INTERNAL_LABEL (buf, prefix, labelno);
7073 ASM_OUTPUT_INTERNAL_LABEL (stream, buf);
7077 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7080 default_asm_declare_constant_name (FILE *file, const char *name,
7081 const_tree exp ATTRIBUTE_UNUSED,
7082 HOST_WIDE_INT size ATTRIBUTE_UNUSED)
7084 assemble_label (file, name);
7087 /* This is the default behavior at the beginning of a file. It's
7088 controlled by two other target-hook toggles. */
7090 default_file_start (void)
7092 if (targetm.asm_file_start_app_off
7093 && !(flag_verbose_asm || flag_debug_asm || flag_dump_rtl_in_asm))
7094 fputs (ASM_APP_OFF, asm_out_file);
7096 if (targetm.asm_file_start_file_directive)
7098 /* LTO produced units have no meaningful main_input_filename. */
7100 output_file_directive (asm_out_file, "<artificial>");
7102 output_file_directive (asm_out_file, main_input_filename);
7106 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7107 which emits a special section directive used to indicate whether or
7108 not this object file needs an executable stack. This is primarily
7109 a GNU extension to ELF but could be used on other targets. */
7111 int trampolines_created;
7114 file_end_indicate_exec_stack (void)
7116 unsigned int flags = SECTION_DEBUG;
7117 if (trampolines_created)
7118 flags |= SECTION_CODE;
7120 switch_to_section (get_section (".note.GNU-stack", flags, NULL));
7123 /* Emit a special section directive to indicate that this object file
7124 was compiled with -fsplit-stack. This is used to let the linker
7125 detect calls between split-stack code and non-split-stack code, so
7126 that it can modify the split-stack code to allocate a sufficiently
7127 large stack. We emit another special section if there are any
7128 functions in this file which have the no_split_stack attribute, to
7129 prevent the linker from warning about being unable to convert the
7130 functions if they call non-split-stack code. */
7133 file_end_indicate_split_stack (void)
7135 if (flag_split_stack)
7137 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG,
7139 if (saw_no_split_stack)
7140 switch_to_section (get_section (".note.GNU-no-split-stack",
7141 SECTION_DEBUG, NULL));
7145 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7146 a get_unnamed_section callback. */
7149 output_section_asm_op (const void *directive)
7151 fprintf (asm_out_file, "%s\n", (const char *) directive);
7154 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7155 the current section is NEW_SECTION. */
7158 switch_to_section (section *new_section)
7160 if (in_section == new_section)
7163 if (new_section->common.flags & SECTION_FORGET)
7166 in_section = new_section;
7168 switch (SECTION_STYLE (new_section))
7171 targetm.asm_out.named_section (new_section->named.name,
7172 new_section->named.common.flags,
7173 new_section->named.decl);
7176 case SECTION_UNNAMED:
7177 new_section->unnamed.callback (new_section->unnamed.data);
7180 case SECTION_NOSWITCH:
7185 new_section->common.flags |= SECTION_DECLARED;
7188 /* If block symbol SYMBOL has not yet been assigned an offset, place
7189 it at the end of its block. */
7192 place_block_symbol (rtx symbol)
7194 unsigned HOST_WIDE_INT size, mask, offset;
7195 struct constant_descriptor_rtx *desc;
7196 unsigned int alignment;
7197 struct object_block *block;
7200 gcc_assert (SYMBOL_REF_BLOCK (symbol));
7201 if (SYMBOL_REF_BLOCK_OFFSET (symbol) >= 0)
7204 /* Work out the symbol's size and alignment. */
7205 if (CONSTANT_POOL_ADDRESS_P (symbol))
7207 desc = SYMBOL_REF_CONSTANT (symbol);
7208 alignment = desc->align;
7209 size = GET_MODE_SIZE (desc->mode);
7211 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
7213 decl = SYMBOL_REF_DECL (symbol);
7214 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl));
7215 alignment = DECL_ALIGN (decl);
7216 size = get_constant_size (DECL_INITIAL (decl));
7217 if ((flag_sanitize & SANITIZE_ADDRESS)
7218 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
7219 && asan_protect_global (DECL_INITIAL (decl)))
7221 size += asan_red_zone_size (size);
7222 alignment = MAX (alignment,
7223 ASAN_RED_ZONE_SIZE * BITS_PER_UNIT);
7228 struct symtab_node *snode;
7229 decl = SYMBOL_REF_DECL (symbol);
7231 snode = symtab_node::get (decl);
7234 rtx target = DECL_RTL (snode->ultimate_alias_target ()->decl);
7236 gcc_assert (MEM_P (target)
7237 && GET_CODE (XEXP (target, 0)) == SYMBOL_REF
7238 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target, 0)));
7239 target = XEXP (target, 0);
7240 place_block_symbol (target);
7241 SYMBOL_REF_BLOCK_OFFSET (symbol) = SYMBOL_REF_BLOCK_OFFSET (target);
7244 alignment = get_variable_align (decl);
7245 size = tree_to_uhwi (DECL_SIZE_UNIT (decl));
7246 if ((flag_sanitize & SANITIZE_ADDRESS)
7247 && asan_protect_global (decl))
7249 size += asan_red_zone_size (size);
7250 alignment = MAX (alignment,
7251 ASAN_RED_ZONE_SIZE * BITS_PER_UNIT);
7255 /* Calculate the object's offset from the start of the block. */
7256 block = SYMBOL_REF_BLOCK (symbol);
7257 mask = alignment / BITS_PER_UNIT - 1;
7258 offset = (block->size + mask) & ~mask;
7259 SYMBOL_REF_BLOCK_OFFSET (symbol) = offset;
7261 /* Record the block's new alignment and size. */
7262 block->alignment = MAX (block->alignment, alignment);
7263 block->size = offset + size;
7265 vec_safe_push (block->objects, symbol);
7268 /* Return the anchor that should be used to address byte offset OFFSET
7269 from the first object in BLOCK. MODEL is the TLS model used
7273 get_section_anchor (struct object_block *block, HOST_WIDE_INT offset,
7274 enum tls_model model)
7277 unsigned int begin, middle, end;
7278 unsigned HOST_WIDE_INT min_offset, max_offset, range, bias, delta;
7281 /* Work out the anchor's offset. Use an offset of 0 for the first
7282 anchor so that we don't pessimize the case where we take the address
7283 of a variable at the beginning of the block. This is particularly
7284 useful when a block has only one variable assigned to it.
7286 We try to place anchors RANGE bytes apart, so there can then be
7287 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7288 a ptr_mode offset. With some target settings, the lowest such
7289 anchor might be out of range for the lowest ptr_mode offset;
7290 likewise the highest anchor for the highest offset. Use anchors
7291 at the extreme ends of the ptr_mode range in such cases.
7293 All arithmetic uses unsigned integers in order to avoid
7295 max_offset = (unsigned HOST_WIDE_INT) targetm.max_anchor_offset;
7296 min_offset = (unsigned HOST_WIDE_INT) targetm.min_anchor_offset;
7297 range = max_offset - min_offset + 1;
7302 bias = HOST_WIDE_INT_1U << (GET_MODE_BITSIZE (ptr_mode) - 1);
7305 delta = -(unsigned HOST_WIDE_INT) offset + max_offset;
7306 delta -= delta % range;
7309 offset = (HOST_WIDE_INT) (-delta);
7313 delta = (unsigned HOST_WIDE_INT) offset - min_offset;
7314 delta -= delta % range;
7315 if (delta > bias - 1)
7317 offset = (HOST_WIDE_INT) delta;
7321 /* Do a binary search to see if there's already an anchor we can use.
7322 Set BEGIN to the new anchor's index if not. */
7324 end = vec_safe_length (block->anchors);
7325 while (begin != end)
7327 middle = (end + begin) / 2;
7328 anchor = (*block->anchors)[middle];
7329 if (SYMBOL_REF_BLOCK_OFFSET (anchor) > offset)
7331 else if (SYMBOL_REF_BLOCK_OFFSET (anchor) < offset)
7333 else if (SYMBOL_REF_TLS_MODEL (anchor) > model)
7335 else if (SYMBOL_REF_TLS_MODEL (anchor) < model)
7341 /* Create a new anchor with a unique label. */
7342 ASM_GENERATE_INTERNAL_LABEL (label, "LANCHOR", anchor_labelno++);
7343 anchor = create_block_symbol (ggc_strdup (label), block, offset);
7344 SYMBOL_REF_FLAGS (anchor) |= SYMBOL_FLAG_LOCAL | SYMBOL_FLAG_ANCHOR;
7345 SYMBOL_REF_FLAGS (anchor) |= model << SYMBOL_FLAG_TLS_SHIFT;
7347 /* Insert it at index BEGIN. */
7348 vec_safe_insert (block->anchors, begin, anchor);
7352 /* Output the objects in BLOCK. */
7355 output_object_block (struct object_block *block)
7357 struct constant_descriptor_rtx *desc;
7359 HOST_WIDE_INT offset;
7363 if (!block->objects)
7366 /* Switch to the section and make sure that the first byte is
7367 suitably aligned. */
7368 /* Special case VTV comdat sections similar to assemble_variable. */
7369 if (SECTION_STYLE (block->sect) == SECTION_NAMED
7370 && block->sect->named.name
7371 && (strcmp (block->sect->named.name, ".vtable_map_vars") == 0))
7372 handle_vtv_comdat_section (block->sect, block->sect->named.decl);
7374 switch_to_section (block->sect);
7376 assemble_align (block->alignment);
7378 /* Define the values of all anchors relative to the current section
7380 FOR_EACH_VEC_SAFE_ELT (block->anchors, i, symbol)
7381 targetm.asm_out.output_anchor (symbol);
7383 /* Output the objects themselves. */
7385 FOR_EACH_VEC_ELT (*block->objects, i, symbol)
7387 /* Move to the object's offset, padding with zeros if necessary. */
7388 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol) - offset);
7389 offset = SYMBOL_REF_BLOCK_OFFSET (symbol);
7390 if (CONSTANT_POOL_ADDRESS_P (symbol))
7392 desc = SYMBOL_REF_CONSTANT (symbol);
7393 /* Pass 1 for align as we have already laid out everything in the block.
7394 So aligning shouldn't be necessary. */
7395 output_constant_pool_1 (desc, 1);
7396 offset += GET_MODE_SIZE (desc->mode);
7398 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol))
7401 decl = SYMBOL_REF_DECL (symbol);
7402 assemble_constant_contents
7403 (DECL_INITIAL (decl), XSTR (symbol, 0), DECL_ALIGN (decl));
7405 size = get_constant_size (DECL_INITIAL (decl));
7407 if ((flag_sanitize & SANITIZE_ADDRESS)
7408 && TREE_CODE (DECL_INITIAL (decl)) == STRING_CST
7409 && asan_protect_global (DECL_INITIAL (decl)))
7411 size = asan_red_zone_size (size);
7412 assemble_zeros (size);
7419 decl = SYMBOL_REF_DECL (symbol);
7420 assemble_variable_contents (decl, XSTR (symbol, 0), false);
7421 size = tree_to_uhwi (DECL_SIZE_UNIT (decl));
7423 if ((flag_sanitize & SANITIZE_ADDRESS)
7424 && asan_protect_global (decl))
7426 size = asan_red_zone_size (size);
7427 assemble_zeros (size);
7434 /* A callback for qsort to compare object_blocks. */
7437 output_object_block_compare (const void *x, const void *y)
7439 object_block *p1 = *(object_block * const*)x;
7440 object_block *p2 = *(object_block * const*)y;
7442 if (p1->sect->common.flags & SECTION_NAMED
7443 && !(p2->sect->common.flags & SECTION_NAMED))
7446 if (!(p1->sect->common.flags & SECTION_NAMED)
7447 && p2->sect->common.flags & SECTION_NAMED)
7450 if (p1->sect->common.flags & SECTION_NAMED
7451 && p2->sect->common.flags & SECTION_NAMED)
7452 return strcmp (p1->sect->named.name, p2->sect->named.name);
7454 unsigned f1 = p1->sect->common.flags;
7455 unsigned f2 = p2->sect->common.flags;
7458 return f1 < f2 ? -1 : 1;
7461 /* Output the definitions of all object_blocks. */
7464 output_object_blocks (void)
7466 vec<object_block *, va_heap> v;
7467 v.create (object_block_htab->elements ());
7469 hash_table<object_block_hasher>::iterator hi;
7471 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab, obj, object_block *, hi)
7474 /* Sort them in order to output them in a deterministic manner,
7475 otherwise we may get .rodata sections in different orders with
7477 v.qsort (output_object_block_compare);
7479 FOR_EACH_VEC_ELT (v, i, obj)
7480 output_object_block (obj);
7485 /* This function provides a possible implementation of the
7486 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7487 by -frecord-gcc-switches it creates a new mergeable, string section in the
7488 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7489 contains the switches in ASCII format.
7491 FIXME: This code does not correctly handle double quote characters
7492 that appear inside strings, (it strips them rather than preserving them).
7493 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7494 characters - instead it treats them as sub-string separators. Since
7495 we want to emit NUL strings terminators into the object file we have to use
7499 elf_record_gcc_switches (print_switch_type type, const char * name)
7503 case SWITCH_TYPE_PASSED:
7504 ASM_OUTPUT_ASCII (asm_out_file, name, strlen (name));
7505 ASM_OUTPUT_SKIP (asm_out_file, (unsigned HOST_WIDE_INT) 1);
7508 case SWITCH_TYPE_DESCRIPTIVE:
7511 /* Distinguish between invocations where name is NULL. */
7512 static bool started = false;
7518 sec = get_section (targetm.asm_out.record_gcc_switches_section,
7522 | (SECTION_ENTSIZE & 1),
7524 switch_to_section (sec);
7533 /* The return value is currently ignored by the caller, but must be 0.
7534 For -fverbose-asm the return value would be the number of characters
7535 emitted into the assembler file. */
7539 /* Emit text to declare externally defined symbols. It is needed to
7540 properly support non-default visibility. */
7542 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED,
7544 const char *name ATTRIBUTE_UNUSED)
7546 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7547 set in order to avoid putting out names that are never really
7548 used. Always output visibility specified in the source. */
7549 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
7550 && (DECL_VISIBILITY_SPECIFIED (decl)
7551 || targetm.binds_local_p (decl)))
7552 maybe_assemble_visibility (decl);
7555 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7558 default_asm_output_source_filename (FILE *file, const char *name)
7560 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7561 ASM_OUTPUT_SOURCE_FILENAME (file, name);
7563 fprintf (file, "\t.file\t");
7564 output_quoted_string (file, name);
7569 /* Output a file name in the form wanted by System V. */
7572 output_file_directive (FILE *asm_file, const char *input_name)
7577 if (input_name == NULL)
7578 input_name = "<stdin>";
7580 input_name = remap_debug_filename (input_name);
7582 len = strlen (input_name);
7583 na = input_name + len;
7585 /* NA gets INPUT_NAME sans directory names. */
7586 while (na > input_name)
7588 if (IS_DIR_SEPARATOR (na[-1]))
7593 targetm.asm_out.output_source_filename (asm_file, na);
7596 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7599 make_debug_expr_from_rtl (const_rtx exp)
7601 tree ddecl = make_node (DEBUG_EXPR_DECL), type;
7602 machine_mode mode = GET_MODE (exp);
7605 DECL_ARTIFICIAL (ddecl) = 1;
7606 if (REG_P (exp) && REG_EXPR (exp))
7607 type = TREE_TYPE (REG_EXPR (exp));
7608 else if (MEM_P (exp) && MEM_EXPR (exp))
7609 type = TREE_TYPE (MEM_EXPR (exp));
7612 if (type && TYPE_MODE (type) == mode)
7613 TREE_TYPE (ddecl) = type;
7615 TREE_TYPE (ddecl) = lang_hooks.types.type_for_mode (mode, 1);
7616 DECL_MODE (ddecl) = mode;
7617 dval = gen_rtx_DEBUG_EXPR (mode);
7618 DEBUG_EXPR_TREE_DECL (dval) = ddecl;
7619 SET_DECL_RTL (ddecl, dval);
7623 #ifdef ELF_ASCII_ESCAPES
7624 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7627 default_elf_asm_output_limited_string (FILE *f, const char *s)
7632 fputs (STRING_ASM_OP, f);
7637 escape = ELF_ASCII_ESCAPES[c];
7645 putc ('0'+((c>>6)&7), f);
7646 putc ('0'+((c>>3)&7), f);
7647 putc ('0'+(c&7), f);
7660 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7663 default_elf_asm_output_ascii (FILE *f, const char *s, unsigned int len)
7665 const char *limit = s + len;
7666 const char *last_null = NULL;
7667 unsigned bytes_in_chunk = 0;
7671 for (; s < limit; s++)
7675 if (bytes_in_chunk >= 60)
7684 for (p = s; p < limit && *p != '\0'; p++)
7691 if (p < limit && (p - s) <= (long) ELF_STRING_LIMIT)
7693 if (bytes_in_chunk > 0)
7700 default_elf_asm_output_limited_string (f, s);
7705 if (bytes_in_chunk == 0)
7706 fputs (ASCII_DATA_ASM_OP "\"", f);
7709 escape = ELF_ASCII_ESCAPES[c];
7718 putc ('0'+((c>>6)&7), f);
7719 putc ('0'+((c>>3)&7), f);
7720 putc ('0'+(c&7), f);
7721 bytes_in_chunk += 4;
7726 bytes_in_chunk += 2;
7733 if (bytes_in_chunk > 0)
7741 static GTY(()) section *elf_init_array_section;
7742 static GTY(()) section *elf_fini_array_section;
7745 get_elf_initfini_array_priority_section (int priority,
7749 if (priority != DEFAULT_INIT_PRIORITY)
7752 sprintf (buf, "%s.%.5u",
7753 constructor_p ? ".init_array" : ".fini_array",
7755 sec = get_section (buf, SECTION_WRITE | SECTION_NOTYPE, NULL_TREE);
7761 if (elf_init_array_section == NULL)
7762 elf_init_array_section
7763 = get_section (".init_array",
7764 SECTION_WRITE | SECTION_NOTYPE, NULL_TREE);
7765 sec = elf_init_array_section;
7769 if (elf_fini_array_section == NULL)
7770 elf_fini_array_section
7771 = get_section (".fini_array",
7772 SECTION_WRITE | SECTION_NOTYPE, NULL_TREE);
7773 sec = elf_fini_array_section;
7779 /* Use .init_array section for constructors. */
7782 default_elf_init_array_asm_out_constructor (rtx symbol, int priority)
7784 section *sec = get_elf_initfini_array_priority_section (priority,
7786 assemble_addr_to_section (symbol, sec);
7789 /* Use .fini_array section for destructors. */
7792 default_elf_fini_array_asm_out_destructor (rtx symbol, int priority)
7794 section *sec = get_elf_initfini_array_priority_section (priority,
7796 assemble_addr_to_section (symbol, sec);
7799 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7801 This is a bit of a cheat. The real default is a no-op, but this
7802 hook is the default for all targets with a .ident directive. */
7805 default_asm_output_ident_directive (const char *ident_str)
7807 const char *ident_asm_op = "\t.ident\t";
7809 /* If we are still in the front end, do not write out the string
7810 to asm_out_file. Instead, add a fake top-level asm statement.
7811 This allows the front ends to use this hook without actually
7812 writing to asm_out_file, to handle #ident or Pragma Ident. */
7813 if (symtab->state == PARSING)
7815 char *buf = ACONCAT ((ident_asm_op, "\"", ident_str, "\"\n", NULL));
7816 symtab->finalize_toplevel_asm (build_string (strlen (buf), buf));
7819 fprintf (asm_out_file, "%s\"%s\"\n", ident_asm_op, ident_str);
7823 /* This function ensures that vtable_map variables are not only
7824 in the comdat section, but that each variable has its own unique
7825 comdat name. Without this the variables end up in the same section
7826 with a single comdat name.
7828 FIXME: resolve_unique_section needs to deal better with
7829 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
7830 that is fixed, this if-else statement can be replaced with
7831 a single call to "switch_to_section (sect)". */
7834 handle_vtv_comdat_section (section *sect, const_tree decl ATTRIBUTE_UNUSED)
7836 #if defined (OBJECT_FORMAT_ELF)
7837 targetm.asm_out.named_section (sect->named.name,
7838 sect->named.common.flags
7843 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
7844 Therefore the following check is used.
7845 In case a the target is PE or COFF a comdat group section
7846 is created, e.g. .vtable_map_vars$foo. The linker places
7847 everything in .vtable_map_vars at the end.
7849 A fix could be made in
7850 gcc/config/i386/winnt.c: i386_pe_unique_section. */
7855 if (TREE_CODE (DECL_NAME (decl)) == IDENTIFIER_NODE)
7856 name = ACONCAT ((sect->named.name, "$",
7857 IDENTIFIER_POINTER (DECL_NAME (decl)), NULL));
7859 name = ACONCAT ((sect->named.name, "$",
7860 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl))),
7863 targetm.asm_out.named_section (name,
7864 sect->named.common.flags
7870 switch_to_section (sect);
7874 #include "gt-varasm.h"